Add the new TTM code. Adjust drm_hashtab include and exports.

linux-core/drm_hashtab.c

@@ -62,6 +62,8 @@ int drm_ht_create(struct drm_open_hash *ht, unsigned int order)
 	}
 	return 0;
 }
+EXPORT_SYMBOL(drm_ht_create);
+
 
 void drm_ht_verbose_list(struct drm_open_hash *ht, unsigned long key)
 {
@@ -126,6 +128,7 @@ int drm_ht_insert_item(struct drm_open_hash *ht, struct drm_hash_item *item)
 	}
 	return 0;
 }
+EXPORT_SYMBOL(drm_ht_insert_item);
 
 /*
  * Just insert an item and return any "bits" bit key that hasn't been
@@ -155,6 +158,7 @@ int drm_ht_just_insert_please(struct drm_open_hash *ht,
 	}
 	return 0;
 }
+EXPORT_SYMBOL(drm_ht_just_insert_please);
 
 int drm_ht_find_item(struct drm_open_hash *ht, unsigned long key,
 		     struct drm_hash_item **item)
@@ -168,6 +172,7 @@ int drm_ht_find_item(struct drm_open_hash *ht, unsigned long key,
 	*item = hlist_entry(list, struct drm_hash_item, head);
 	return 0;
 }
+EXPORT_SYMBOL(drm_ht_find_item);
 
 int drm_ht_remove_key(struct drm_open_hash *ht, unsigned long key)
 {
@@ -188,6 +193,7 @@ int drm_ht_remove_item(struct drm_open_hash *ht, struct drm_hash_item *item)
 	ht->fill--;
 	return 0;
 }
+EXPORT_SYMBOL(drm_ht_remove_item);
 
 void drm_ht_remove(struct drm_open_hash *ht)
 {
@@ -200,3 +206,4 @@ void drm_ht_remove(struct drm_open_hash *ht)
 		ht->table = NULL;
 	}
 }
+EXPORT_SYMBOL(drm_ht_remove);

linux-core/drm_hashtab.h

@@ -34,6 +34,7 @@
 
 #ifndef DRM_HASHTAB_H
 #define DRM_HASHTAB_H
+#include <linux/list.h>
 
 #define drm_hash_entry(_ptr, _type, _member) container_of(_ptr, _type, _member)
 

linux-core/ttm/Makefile.am

@@ -0,0 +1,27 @@
+#  Copyright 2005 Adam Jackson.
+#
+#  Permission is hereby granted, free of charge, to any person obtaining a
+#  copy of this software and associated documentation files (the "Software"),
+#  to deal in the Software without restriction, including without limitation
+#  on the rights to use, copy, modify, merge, publish, distribute, sub
+#  license, and/or sell copies of the Software, and to permit persons to whom
+#  the Software is furnished to do so, subject to the following conditions:
+#
+#  The above copyright notice and this permission notice (including the next
+#  paragraph) shall be included in all copies or substantial portions of the
+#  Software.
+#
+#  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+#  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+#  FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
+#  ADAM JACKSON BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+#  IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+#  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+# XXX airlied says, nothing besides *_drm.h and drm*.h should be necessary.
+# however, r300 and via need their reg headers installed in order to build.
+# better solutions are welcome.
+
+klibdrmincludedir = ${includedir}/drm/ttm
+klibdrminclude_HEADERS = ttm_placement_user.h ttm_placement_common.h \
+	ttm_fence_user.h

linux-core/ttm/ttm_agp_backend.c

@@ -0,0 +1,149 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2006-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
+ * All Rights Reserved.
+ * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
+ *          Keith Packard.
+ */
+
+#include "ttm/ttm_bo_driver.h"
+#ifdef TTM_HAS_AGP
+#include "ttm/ttm_placement_common.h"
+#include <linux/agp_backend.h>
+#include <asm/agp.h>
+#include <asm/io.h>
+
+struct ttm_agp_backend {
+	struct ttm_backend backend;
+	struct agp_memory *mem;
+	struct agp_bridge_data *bridge;
+};
+
+static int ttm_agp_populate(struct ttm_backend *backend,
+			    unsigned long num_pages, struct page **pages,
+			    struct page *dummy_read_page)
+{
+	struct ttm_agp_backend *agp_be =
+	    container_of(backend, struct ttm_agp_backend, backend);
+	struct page **cur_page, **last_page = pages + num_pages;
+	struct agp_memory *mem;
+
+	mem = agp_allocate_memory(agp_be->bridge, num_pages, AGP_USER_MEMORY);
+	if (unlikely(mem == NULL))
+		return -ENOMEM;
+
+	mem->page_count = 0;
+	for (cur_page = pages; cur_page < last_page; ++cur_page) {
+		struct page *page = *cur_page;
+		if (!page) {
+			page = dummy_read_page;
+		}
+		mem->memory[mem->page_count++] =
+		    phys_to_gart(page_to_phys(page));
+	}
+	agp_be->mem = mem;
+	return 0;
+}
+
+static int ttm_agp_bind(struct ttm_backend *backend, struct ttm_mem_reg *bo_mem)
+{
+	struct ttm_agp_backend *agp_be =
+	    container_of(backend, struct ttm_agp_backend, backend);
+	struct agp_memory *mem = agp_be->mem;
+	int cached = (bo_mem->flags & TTM_PL_FLAG_CACHED);
+	int ret;
+
+	mem->is_flushed = 1;
+	mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY;
+
+	ret = agp_bind_memory(mem, bo_mem->mm_node->start);
+	if (ret)
+		printk(KERN_ERR "AGP Bind memory failed.\n");
+
+	return ret;
+}
+
+static int ttm_agp_unbind(struct ttm_backend *backend)
+{
+	struct ttm_agp_backend *agp_be =
+	    container_of(backend, struct ttm_agp_backend, backend);
+
+	if (agp_be->mem->is_bound)
+		return agp_unbind_memory(agp_be->mem);
+	else
+		return 0;
+}
+
+static void ttm_agp_clear(struct ttm_backend *backend)
+{
+	struct ttm_agp_backend *agp_be =
+	    container_of(backend, struct ttm_agp_backend, backend);
+	struct agp_memory *mem = agp_be->mem;
+
+	if (mem) {
+		ttm_agp_unbind(backend);
+		agp_free_memory(mem);
+	}
+	agp_be->mem = NULL;
+}
+
+static void ttm_agp_destroy(struct ttm_backend *backend)
+{
+	struct ttm_agp_backend *agp_be =
+	    container_of(backend, struct ttm_agp_backend, backend);
+
+	if (agp_be->mem)
+		ttm_agp_clear(backend);
+	kfree(agp_be);
+}
+
+static struct ttm_backend_func ttm_agp_func = {
+	.populate = ttm_agp_populate,
+	.clear = ttm_agp_clear,
+	.bind = ttm_agp_bind,
+	.unbind = ttm_agp_unbind,
+	.destroy = ttm_agp_destroy,
+};
+
+struct ttm_backend *ttm_agp_backend_init(struct ttm_bo_device *bdev,
+					 struct agp_bridge_data *bridge)
+{
+	struct ttm_agp_backend *agp_be;
+
+	agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL);
+	if (!agp_be)
+		return NULL;
+
+	agp_be->mem = NULL;
+	agp_be->bridge = bridge;
+	agp_be->backend.func = &ttm_agp_func;
+	agp_be->backend.bdev = bdev;
+	return &agp_be->backend;
+}
+
+#endif

linux-core/ttm/ttm_bo_api.h

@@ -0,0 +1,578 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2006-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
+ * All Rights Reserved.
+ * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
+ */
+
+#ifndef _TTM_BO_API_H_
+#define _TTM_BO_API_H_
+
+#include "drm_hashtab.h"
+#include <linux/kref.h>
+#include <linux/list.h>
+#include <linux/wait.h>
+#include <linux/mutex.h>
+#include <linux/mm.h>
+#include <linux/rbtree.h>
+
+struct ttm_bo_device;
+
+struct drm_mm_node;
+
+/**
+ * struct ttm_mem_reg
+ *
+ * @mm_node: Memory manager node.
+ * @size: Requested size of memory region.
+ * @num_pages: Actual size of memory region in pages.
+ * @page_alignment: Page alignment.
+ * @flags: Placement flags.
+ * @proposed_flags: Proposed placement flags.
+ *
+ * Structure indicating the placement and space resources used by a
+ * buffer object.
+ */
+
+struct ttm_mem_reg {
+	struct drm_mm_node *mm_node;
+	unsigned long size;
+	unsigned long num_pages;
+	uint32_t page_alignment;
+	uint32_t mem_type;
+	uint32_t flags;
+	uint32_t proposed_flags;
+};
+
+/**
+ * enum ttm_bo_type
+ *
+ * @ttm_bo_type_device:	These are 'normal' buffers that can
+ * be mmapped by user space. Each of these bos occupy a slot in the
+ * device address space, that can be used for normal vm operations.
+ *
+ * @ttm_bo_type_user: These are user-space memory areas that are made
+ * available to the GPU by mapping the buffer pages into the GPU aperture
+ * space. These buffers cannot be mmaped from the device address space.
+ *
+ * @ttm_bo_type_kernel: These buffers are like ttm_bo_type_device buffers,
+ * but they cannot be accessed from user-space. For kernel-only use.
+ */
+
+enum ttm_bo_type {
+	ttm_bo_type_device,
+	ttm_bo_type_user,
+	ttm_bo_type_kernel
+};
+
+struct ttm_tt;
+
+/**
+ * struct ttm_buffer_object
+ *
+ * @bdev: Pointer to the buffer object device structure.
+ * @kref: Reference count of this buffer object. When this refcount reaches
+ * zero, the object is put on the delayed delete list.
+ * @list_kref: List reference count of this buffer object. This member is
+ * used to avoid destruction while the buffer object is still on a list.
+ * Lru lists may keep one refcount, the delayed delete list, and kref != 0
+ * keeps one refcount. When this refcount reaches zero,
+ * the object is destroyed.
+ * @proposed_flags: Proposed placement for the buffer. Changed only by the
+ * creator prior to validation as opposed to bo->mem.proposed_flags which is
+ * changed by the implementation prior to a buffer move if it wants to outsmart
+ * the buffer creator / user. This latter happens, for example, at eviction.
+ * @buffer_start: The virtual user-space start address of ttm_bo_type_user
+ * buffers.
+ * @type: The bo type.
+ * @offset: The current GPU offset, which can have different meanings
+ * depending on the memory type. For SYSTEM type memory, it should be 0.
+ * @mem: structure describing current placement.
+ * @val_seq: Sequence of the validation holding the @reserved lock.
+ * Used to avoid starvation when many processes compete to validate the
+ * buffer. This member is protected by the bo_device::lru_lock.
+ * @seq_valid: The value of @val_seq is valid. This value is protected by
+ * the bo_device::lru_lock.
+ * @lru: List head for the lru list.
+ * @ddestroy: List head for the delayed destroy list.
+ * @swap: List head for swap LRU list.
+ * @persistant_swap_storage: Usually the swap storage is deleted for buffers
+ * pinned in physical memory. If this behaviour is not desired, this member
+ * holds a pointer to a persistant shmem object.
+ * @destroy: Destruction function. If NULL, kfree is used.
+ * @sync_obj_arg: Opaque argument to synchronization object function.
+ * @sync_obj: Pointer to a synchronization object.
+ * @priv_flags: Flags describing buffer object internal state.
+ * @event_queue: Queue for processes waiting on buffer object status change.
+ * @mutex: Lock protecting all members with the exception of constant members
+ * and list heads. We should really use a spinlock here.
+ * @num_pages: Actual number of pages.
+ * @ttm: TTM structure holding system pages.
+ * @vm_hash: Hash item for fast address space lookup. Need to change to a
+ * rb-tree node.
+ * @vm_node: Address space manager node.
+ * @addr_space_offset: Address space offset.
+ * @cpu_writes: For synchronization. Number of cpu writers.
+ * @reserved: Deadlock-free lock used for synchronization state transitions.
+ * @acc_size: Accounted size for this object.
+ *
+ * Base class for TTM buffer object, that deals with data placement and CPU
+ * mappings. GPU mappings are really up to the driver, but for simpler GPUs
+ * the driver can usually use the placement offset @offset directly as the
+ * GPU virtual address. For drivers implementing multiple
+ * GPU memory manager contexts, the driver should manage the address space
+ * in these contexts separately and use these objects to get the correct
+ * placement and caching for these GPU maps. This makes it possible to use
+ * these objects for even quite elaborate memory management schemes.
+ * The destroy member, the API visibility of this object makes it possible
+ * to derive driver specific types.
+ */
+
+struct ttm_buffer_object {
+	struct ttm_bo_device *bdev;
+	struct kref kref;
+	struct kref list_kref;
+
+	/*
+	 * If there is a possibility that the usage variable is zero,
+	 * then dev->struct_mutex should be locked before incrementing it.
+	 */
+
+	uint32_t proposed_flags;
+	unsigned long buffer_start;
+	enum ttm_bo_type type;
+	unsigned long offset;
+	struct ttm_mem_reg mem;
+	uint32_t val_seq;
+	int seq_valid;
+
+	struct list_head lru;
+	struct list_head ddestroy;
+	struct list_head swap;
+
+	struct file *persistant_swap_storage;
+
+	void (*destroy) (struct ttm_buffer_object *);
+
+	void *sync_obj_arg;
+	void *sync_obj;
+
+	uint32_t priv_flags;
+	wait_queue_head_t event_queue;
+	struct mutex mutex;
+	unsigned long num_pages;
+
+	struct ttm_tt *ttm;
+	struct rb_node vm_rb;
+	struct drm_mm_node *vm_node;
+	uint64_t addr_space_offset;
+
+	atomic_t cpu_writers;
+	atomic_t reserved;
+
+	size_t acc_size;
+};
+
+/**
+ * struct ttm_bo_kmap_obj
+ *
+ * @virtual: The current kernel virtual address.
+ * @page: The page when kmap'ing a single page.
+ * @bo_kmap_type: Type of bo_kmap.
+ *
+ * Object describing a kernel mapping. Since a TTM bo may be located
+ * in various memory types with various caching policies, the
+ * mapping can either be an ioremap, a vmap, a kmap or part of a
+ * premapped region.
+ */
+
+struct ttm_bo_kmap_obj {
+	void *virtual;
+	struct page *page;
+	enum {
+		ttm_bo_map_iomap,
+		ttm_bo_map_vmap,
+		ttm_bo_map_kmap,
+		ttm_bo_map_premapped,
+	} bo_kmap_type;
+};
+
+/**
+ * ttm_bo_reference - reference a struct ttm_buffer_object
+ *
+ * @bo: The buffer object.
+ *
+ * Returns a refcounted pointer to a buffer object.
+ */
+
+static inline struct ttm_buffer_object *ttm_bo_reference(struct
+							 ttm_buffer_object *bo)
+{
+	kref_get(&bo->kref);
+	return bo;
+}
+
+/**
+ * ttm_bo_wait - wait for buffer idle.
+ *
+ * @bo:  The buffer object.
+ * @interruptible:  Use interruptible wait.
+ * @no_wait:  Return immediately if buffer is busy.
+ *
+ * This function must be called with the bo::mutex held, and makes
+ * sure any previous rendering to the buffer is completed.
+ * Note: It might be necessary to block validations before the
+ * wait by reserving the buffer.
+ * Returns -EBUSY if no_wait is true and the buffer is busy.
+ * Returns -ERESTART if interrupted by a signal.
+ */
+extern int ttm_bo_wait(struct ttm_buffer_object *bo, int lazy,
+		       int interruptible, int no_wait);
+/**
+ * ttm_buffer_object_validate
+ *
+ * @bo: The buffer object.
+ * @interruptible: Sleep interruptible if sleeping.
+ * @no_wait: Return immediately if the buffer is busy.
+ *
+ * Changes placement and caching policy of the buffer object
+ * according to bo::proposed_flags.
+ * Returns
+ * -EINVAL on invalid proposed_flags.
+ * -ENOMEM on out-of-memory condition.
+ * -EBUSY if no_wait is true and buffer busy.
+ * -ERESTART if interrupted by a signal.
+ */
+extern int ttm_buffer_object_validate(struct ttm_buffer_object *bo,
+				      int interruptible, int no_wait);
+/**
+ * ttm_bo_unref
+ *
+ * @bo: The buffer object.
+ *
+ * Unreference and clear a pointer to a buffer object.
+ */
+extern void ttm_bo_unref(struct ttm_buffer_object **bo);
+
+/**
+ * ttm_bo_synccpu_write_grab
+ *
+ * @bo: The buffer object:
+ * @no_wait: Return immediately if buffer is busy.
+ *
+ * Synchronizes a buffer object for CPU RW access. This means
+ * blocking command submission that affects the buffer and
+ * waiting for buffer idle. This lock is recursive.
+ * Returns
+ * -EBUSY if the buffer is busy and no_wait is true.
+ * -ERESTART if interrupted by a signal.
+ */
+
+extern int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, int no_wait);
+/**
+ * ttm_bo_synccpu_write_release:
+ *
+ * @bo : The buffer object.
+ *
+ * Releases a synccpu lock.
+ */
+extern void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo);
+
+/**
+ * ttm_buffer_object_init
+ *
+ * @bdev: Pointer to a ttm_bo_device struct.
+ * @bo: Pointer to a ttm_buffer_object to be initialized.
+ * @size: Requested size of buffer object.
+ * @type: Requested type of buffer object.
+ * @flags: Initial placement flags.
+ * @page_alignment: Data alignment in pages.
+ * @buffer_start: Virtual address of user space data backing a
+ * user buffer object.
+ * @interruptible: If needing to sleep to wait for GPU resources,
+ * sleep interruptible.
+ * @persistant_swap_storage: Usually the swap storage is deleted for buffers
+ * pinned in physical memory. If this behaviour is not desired, this member
+ * holds a pointer to a persistant shmem object. Typically, this would
+ * point to the shmem object backing a GEM object if TTM is used to back a
+ * GEM user interface.
+ * @acc_size: Accounted size for this object.
+ * @destroy: Destroy function. Use NULL for kfree().
+ *
+ * This function initializes a pre-allocated struct ttm_buffer_object.
+ * As this object may be part of a larger structure, this function,
+ * together with the @destroy function,
+ * enables driver-specific objects derived from a ttm_buffer_object.
+ * On successful return, the object kref and list_kref are set to 1.
+ * Returns
+ * -ENOMEM: Out of memory.
+ * -EINVAL: Invalid placement flags.
+ * -ERESTART: Interrupted by signal while sleeping waiting for resources.
+ */
+
+extern int ttm_buffer_object_init(struct ttm_bo_device *bdev,
+				  struct ttm_buffer_object *bo,
+				  unsigned long size,
+				  enum ttm_bo_type type,
+				  uint32_t flags,
+				  uint32_t page_alignment,
+				  unsigned long buffer_start,
+				  int interrubtible,
+				  struct file *persistant_swap_storage,
+				  size_t acc_size,
+				  void (*destroy) (struct ttm_buffer_object *));
+/**
+ * ttm_bo_synccpu_object_init
+ *
+ * @bdev: Pointer to a ttm_bo_device struct.
+ * @bo: Pointer to a ttm_buffer_object to be initialized.
+ * @size: Requested size of buffer object.
+ * @type: Requested type of buffer object.
+ * @flags: Initial placement flags.
+ * @page_alignment: Data alignment in pages.
+ * @buffer_start: Virtual address of user space data backing a
+ * user buffer object.
+ * @interruptible: If needing to sleep while waiting for GPU resources,
+ * sleep interruptible.
+ * @persistant_swap_storage: Usually the swap storage is deleted for buffers
+ * pinned in physical memory. If this behaviour is not desired, this member
+ * holds a pointer to a persistant shmem object. Typically, this would
+ * point to the shmem object backing a GEM object if TTM is used to back a
+ * GEM user interface.
+ * @p_bo: On successful completion *p_bo points to the created object.
+ *
+ * This function allocates a ttm_buffer_object, and then calls
+ * ttm_buffer_object_init on that object.
+ * The destroy function is set to kfree().
+ * Returns
+ * -ENOMEM: Out of memory.
+ * -EINVAL: Invalid placement flags.
+ * -ERESTART: Interrupted by signal while waiting for resources.
+ */
+
+extern int ttm_buffer_object_create(struct ttm_bo_device *bdev,
+				    unsigned long size,
+				    enum ttm_bo_type type,
+				    uint32_t flags,
+				    uint32_t page_alignment,
+				    unsigned long buffer_start,
+				    int interruptible,
+				    struct file *persistant_swap_storage,
+				    struct ttm_buffer_object **p_bo);
+
+/**
+ * ttm_bo_check_placement
+ *
+ * @bo: the buffer object.
+ * @set_flags: placement flags to set.
+ * @clr_flags: placement flags to clear.
+ *
+ * Performs minimal validity checking on an intended change of
+ * placement flags.
+ * Returns
+ * -EINVAL: Intended change is invalid or not allowed.
+ */
+
+extern int ttm_bo_check_placement(struct ttm_buffer_object *bo,
+				  uint32_t set_flags, uint32_t clr_flags);
+
+/**
+ * ttm_bo_init_mm
+ *
+ * @bdev: Pointer to a ttm_bo_device struct.
+ * @mem_type: The memory type.
+ * @p_offset: offset for managed area in pages.
+ * @p_size: size managed area in pages.
+ *
+ * Initialize a manager for a given memory type.
+ * Note: if part of driver firstopen, it must be protected from a
+ * potentially racing lastclose.
+ * Returns:
+ * -EINVAL: invalid size or memory type.
+ * -ENOMEM: Not enough memory.
+ * May also return driver-specified errors.
+ */
+
+extern int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
+			  unsigned long p_offset, unsigned long p_size);
+/**
+ * ttm_bo_clean_mm
+ *
+ * @bdev: Pointer to a ttm_bo_device struct.
+ * @mem_type: The memory type.
+ *
+ * Take down a manager for a given memory type after first walking
+ * the LRU list to evict any buffers left alive.
+ *
+ * Normally, this function is part of lastclose() or unload(), and at that
+ * point there shouldn't be any buffers left created by user-space, since
+ * there should've been removed by the file descriptor release() method.
+ * However, before this function is run, make sure to signal all sync objects,
+ * and verify that the delayed delete queue is empty. The driver must also
+ * make sure that there are no NO_EVICT buffers present in this memory type
+ * when the call is made.
+ *
+ * If this function is part of a VT switch, the caller must make sure that
+ * there are no appications currently validating buffers before this
+ * function is called. The caller can do that by first taking the
+ * struct ttm_bo_device::ttm_lock in write mode.
+ *
+ * Returns:
+ * -EINVAL: invalid or uninitialized memory type.
+ * -EBUSY: There are still buffers left in this memory type.
+ */
+
+extern int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type);
+
+/**
+ * ttm_bo_evict_mm
+ *
+ * @bdev: Pointer to a ttm_bo_device struct.
+ * @mem_type: The memory type.
+ *
+ * Evicts all buffers on the lru list of the memory type.
+ * This is normally part of a VT switch or an
+ * out-of-memory-space-due-to-fragmentation handler.
+ * The caller must make sure that there are no other processes
+ * currently validating buffers, and can do that by taking the
+ * struct ttm_bo_device::ttm_lock in write mode.
+ *
+ * Returns:
+ * -EINVAL: Invalid or uninitialized memory type.
+ * -ERESTART: The call was interrupted by a signal while waiting to
+ * evict a buffer.
+ */
+
+extern int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type);
+
+/**
+ * ttm_kmap_obj_virtual
+ *
+ * @map: A struct ttm_bo_kmap_obj returned from ttm_bo_kmap.
+ * @is_iomem: Pointer to an integer that on return indicates 1 if the
+ * virtual map is io memory, 0 if normal memory.
+ *
+ * Returns the virtual address of a buffer object area mapped by ttm_bo_kmap.
+ * If *is_iomem is 1 on return, the virtual address points to an io memory area,
+ * that should strictly be accessed by the iowriteXX() and similar functions.
+ */
+
+static inline void *ttm_kmap_obj_virtual(struct ttm_bo_kmap_obj *map,
+					 int *is_iomem)
+{
+	*is_iomem = (map->bo_kmap_type == ttm_bo_map_iomap ||
+		     map->bo_kmap_type == ttm_bo_map_premapped);
+	return map->virtual;
+}
+
+/**
+ * ttm_bo_kmap
+ *
+ * @bo: The buffer object.
+ * @start_page: The first page to map.
+ * @num_pages: Number of pages to map.
+ * @map: pointer to a struct ttm_bo_kmap_obj representing the map.
+ *
+ * Sets up a kernel virtual mapping, using ioremap, vmap or kmap to the
+ * data in the buffer object. The ttm_kmap_obj_virtual function can then be
+ * used to obtain a virtual address to the data.
+ *
+ * Returns
+ * -ENOMEM: Out of memory.
+ * -EINVAL: Invalid range.
+ */
+
+extern int ttm_bo_kmap(struct ttm_buffer_object *bo, unsigned long start_page,
+		       unsigned long num_pages, struct ttm_bo_kmap_obj *map);
+
+/**
+ * ttm_bo_kunmap
+ *
+ * @map: Object describing the map to unmap.
+ *
+ * Unmaps a kernel map set up by ttm_bo_kmap.
+ */
+
+extern void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map);
+
+#if 0
+#endif
+
+/**
+ * ttm_fbdev_mmap - mmap fbdev memory backed by a ttm buffer object.
+ *
+ * @vma:       vma as input from the fbdev mmap method.
+ * @bo:        The bo backing the address space. The address space will
+ * have the same size as the bo, and start at offset 0.
+ *
+ * This function is intended to be called by the fbdev mmap method
+ * if the fbdev address space is to be backed by a bo.
+ */
+
+extern int ttm_fbdev_mmap(struct vm_area_struct *vma,
+			  struct ttm_buffer_object *bo);
+
+/**
+ * ttm_bo_mmap - mmap out of the ttm device address space.
+ *
+ * @filp:      filp as input from the mmap method.
+ * @vma:       vma as input from the mmap method.
+ * @bdev:      Pointer to the ttm_bo_device with the address space manager.
+ *
+ * This function is intended to be called by the device mmap method.
+ * if the device address space is to be backed by the bo manager.
+ */
+
+extern int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma,
+		       struct ttm_bo_device *bdev);
+
+/**
+ * ttm_bo_io
+ *
+ * @bdev:      Pointer to the struct ttm_bo_device.
+ * @filp:      Pointer to the struct file attempting to read / write.
+ * @wbuf:      User-space pointer to address of buffer to write. NULL on read.
+ * @rbuf:      User-space pointer to address of buffer to read into. Null on write.
+ * @count:     Number of bytes to read / write.
+ * @f_pos:     Pointer to current file position.
+ * @write:     1 for read, 0 for write.
+ *
+ * This function implements read / write into ttm buffer objects, and is intended to
+ * be called from the fops::read and fops::write method.
+ * Returns:
+ * See man (2) write, man(2) read. In particular, the function may return -EINTR if
+ * interrupted by a signal.
+ */
+
+extern ssize_t ttm_bo_io(struct ttm_bo_device *bdev, struct file *filp,
+			 const char __user * wbuf, char __user * rbuf,
+			 size_t count, loff_t * f_pos, int write);
+
+extern void ttm_bo_swapout_all(struct ttm_bo_device *bdev);
+
+#endif

linux-core/ttm/ttm_bo_driver.h

@@ -0,0 +1,859 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2006-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
+ * All Rights Reserved.
+ * Copyright (c) 2009 Vmware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
+ */
+#ifndef _TTM_BO_DRIVER_H_
+#define _TTM_BO_DRIVER_H_
+
+#include "ttm/ttm_bo_api.h"
+#include "ttm/ttm_memory.h"
+#include "drm_mm.h"
+#include "linux/workqueue.h"
+#include "linux/fs.h"
+#include "linux/spinlock.h"
+
+struct ttm_backend;
+
+struct ttm_backend_func {
+	/**
+	 * struct ttm_backend_func member populate
+	 *
+	 * @backend: Pointer to a struct ttm_backend.
+	 * @num_pages: Number of pages to populate.
+	 * @pages: Array of pointers to ttm pages.
+	 * @dummy_read_page: Page to be used instead of NULL pages in the
+	 * array @pages.
+	 *
+	 * Populate the backend with ttm pages. Depending on the backend,
+	 * it may or may not copy the @pages array.
+	 */
+	int (*populate) (struct ttm_backend * backend,
+			 unsigned long num_pages, struct page ** pages,
+			 struct page * dummy_read_page);
+	/**
+	 * struct ttm_backend_func member clear
+	 *
+	 * @backend: Pointer to a struct ttm_backend.
+	 *
+	 * This is an "unpopulate" function. Release all resources
+	 * allocated with populate.
+	 */
+	void (*clear) (struct ttm_backend * backend);
+
+	/**
+	 * struct ttm_backend_func member bind
+	 *
+	 * @backend: Pointer to a struct ttm_backend.
+	 * @bo_mem: Pointer to a struct ttm_mem_reg describing the
+	 * memory type and location for binding.
+	 *
+	 * Bind the backend pages into the aperture in the location
+	 * indicated by @bo_mem. This function should be able to handle
+	 * differences between aperture- and system page sizes.
+	 */
+	int (*bind) (struct ttm_backend * backend, struct ttm_mem_reg * bo_mem);
+
+	/**
+	 * struct ttm_backend_func member unbind
+	 *
+	 * @backend: Pointer to a struct ttm_backend.
+	 *
+	 * Unbind previously bound backend pages. This function should be
+	 * able to handle differences between aperture- and system page sizes.
+	 */
+	int (*unbind) (struct ttm_backend * backend);
+
+	/**
+	 * struct ttm_backend_func member destroy
+	 *
+	 * @backend: Pointer to a struct ttm_backend.
+	 *
+	 * Destroy the backend.
+	 */
+	void (*destroy) (struct ttm_backend * backend);
+};
+
+/**
+ * struct ttm_backend
+ *
+ * @bdev: Pointer to a struct ttm_bo_device.
+ * @flags: For driver use.
+ * @func: Pointer to a struct ttm_backend_func that describes
+ * the backend methods.
+ *
+ */
+
+struct ttm_backend {
+	struct ttm_bo_device *bdev;
+	uint32_t flags;
+	struct ttm_backend_func *func;
+};
+
+#define TTM_PAGE_FLAG_VMALLOC         (1 << 0)
+#define TTM_PAGE_FLAG_USER            (1 << 1)
+#define TTM_PAGE_FLAG_USER_DIRTY      (1 << 2)
+#define TTM_PAGE_FLAG_WRITE           (1 << 3)
+#define TTM_PAGE_FLAG_SWAPPED         (1 << 4)
+#define TTM_PAGE_FLAG_PERSISTANT_SWAP (1 << 5)
+
+enum ttm_caching_state {
+	tt_uncached,
+	tt_wc,
+	tt_cached
+};
+
+/**
+ * struct ttm_tt
+ *
+ * @dummy_read_page: Page to map where the ttm_tt page array contains a NULL
+ * pointer.
+ * @pages: Array of pages backing the data.
+ * @first_himem_page: Himem pages are put last in the page array, which
+ * enables us to run caching attribute changes on only the first part
+ * of the page array containing lomem pages. This is the index of the
+ * first himem page.
+ * @last_lomem_page: Index of the last lomem page in the page array.
+ * @num_pages: Number of pages in the page array.
+ * @bdev: Pointer to the current struct ttm_bo_device.
+ * @be: Pointer to the ttm backend.
+ * @tsk: The task for user ttm.
+ * @start: virtual address for user ttm.
+ * @swap_storage: Pointer to shmem struct file for swap storage.
+ * @caching_state: The current caching state of the pages.
+ * @state: The current binding state of the pages.
+ *
+ * This is a structure holding the pages, caching- and aperture binding
+ * status for a buffer object that isn't backed by fixed (VRAM / AGP)
+ * memory.
+ */
+
+struct ttm_tt {
+	struct page *dummy_read_page;
+	struct page **pages;
+	long first_himem_page;
+	long last_lomem_page;
+	uint32_t page_flags;
+	unsigned long num_pages;
+	struct ttm_bo_device *bdev;
+	struct ttm_backend *be;
+	struct task_struct *tsk;
+	unsigned long start;
+	struct file *swap_storage;
+	enum ttm_caching_state caching_state;
+	enum {
+		tt_bound,
+		tt_unbound,
+		tt_unpopulated,
+	} state;
+};
+
+#define TTM_MEMTYPE_FLAG_FIXED         (1 << 0)	/* Fixed (on-card) PCI memory */
+#define TTM_MEMTYPE_FLAG_MAPPABLE      (1 << 1)	/* Memory mappable */
+#define TTM_MEMTYPE_FLAG_NEEDS_IOREMAP (1 << 2)	/* Fixed memory needs ioremap
+						   before kernel access. */
+#define TTM_MEMTYPE_FLAG_CMA           (1 << 3)	/* Can't map aperture */
+
+/**
+ * struct ttm_mem_type_manager
+ *
+ * @has_type: The memory type has been initialized.
+ * @use_type: The memory type is enabled.
+ * @flags: TTM_MEMTYPE_XX flags identifying the traits of the memory
+ * managed by this memory type.
+ * @gpu_offset: If used, the GPU offset of the first managed page of
+ * fixed memory or the first managed location in an aperture.
+ * @io_offset: The io_offset of the first managed page of IO memory or
+ * the first managed location in an aperture. For TTM_MEMTYPE_FLAG_CMA
+ * memory, this should be set to NULL.
+ * @io_size: The size of a managed IO region (fixed memory or aperture).
+ * @io_addr: Virtual kernel address if the io region is pre-mapped. For
+ * TTM_MEMTYPE_FLAG_NEEDS_IOREMAP there is no pre-mapped io map and
+ * @io_addr should be set to NULL.
+ * @size: Size of the managed region.
+ * @available_caching: A mask of available caching types, TTM_PL_FLAG_XX,
+ * as defined in ttm_placement_common.h
+ * @default_caching: The default caching policy used for a buffer object
+ * placed in this memory type if the user doesn't provide one.
+ * @manager: The range manager used for this memory type. FIXME: If the aperture
+ * has a page size different from the underlying system, the granularity
+ * of this manager should take care of this. But the range allocating code
+ * in ttm_bo.c needs to be modified for this.
+ * @lru: The lru list for this memory type.
+ *
+ * This structure is used to identify and manage memory types for a device.
+ * It's set up by the ttm_bo_driver::init_mem_type method.
+ */
+
+struct ttm_mem_type_manager {
+
+	/*
+	 * No protection. Constant from start.
+	 */
+
+	int has_type;
+	int use_type;
+	uint32_t flags;
+	unsigned long gpu_offset;
+	unsigned long io_offset;
+	unsigned long io_size;
+	void *io_addr;
+	uint64_t size;
+	uint32_t available_caching;
+	uint32_t default_caching;
+
+	/*
+	 * Protected by the bdev->lru_lock.
+	 * TODO: Consider one lru_lock per ttm_mem_type_manager.
+	 * Plays ill with list removal, though.
+	 */
+
+	struct drm_mm manager;
+	struct list_head lru;
+};
+
+/**
+ * struct ttm_bo_driver
+ *
+ * @mem_type_prio: Priority array of memory types to place a buffer object in
+ * if it fits without evicting buffers from any of these memory types.
+ * @mem_busy_prio: Priority array of memory types to place a buffer object in
+ * if it needs to evict buffers to make room.
+ * @num_mem_type_prio: Number of elements in the @mem_type_prio array.
+ * @num_mem_busy_prio: Number of elements in the @num_mem_busy_prio array.
+ * @create_ttm_backend_entry: Callback to create a struct ttm_backend.
+ * @invalidate_caches: Callback to invalidate read caches when a buffer object
+ * has been evicted.
+ * @init_mem_type: Callback to initialize a struct ttm_mem_type_manager structure.
+ * @evict_flags: Callback to obtain placement flags when a buffer is evicted.
+ * @move: Callback for a driver to hook in accelerated functions to move a buffer.
+ * If set to NULL, a potentially slow memcpy() move is used.
+ * @sync_obj_signaled: See ttm_fence_api.h
+ * @sync_obj_wait: See ttm_fence_api.h
+ * @sync_obj_flush: See ttm_fence_api.h
+ * @sync_obj_unref: See ttm_fence_api.h
+ * @sync_obj_ref: See ttm_fence_api.h
+ */
+
+struct ttm_bo_driver {
+	const uint32_t *mem_type_prio;
+	const uint32_t *mem_busy_prio;
+	uint32_t num_mem_type_prio;
+	uint32_t num_mem_busy_prio;
+
+	/**
+	 * struct ttm_bo_driver member create_ttm_backend_entry
+	 *
+	 * @bdev: The buffer object device.
+	 *
+	 * Create a driver specific struct ttm_backend.
+	 */
+
+	struct ttm_backend *(*create_ttm_backend_entry)
+	 (struct ttm_bo_device * bdev);
+
+	/**
+	 * struct ttm_bo_driver member invalidate_caches
+	 *
+	 * @bdev: the buffer object device.
+	 * @flags: new placement of the rebound buffer object.
+	 *
+	 * A previosly evicted buffer has been rebound in a
+	 * potentially new location. Tell the driver that it might
+	 * consider invalidating read (texture) caches on the next command
+	 * submission as a consequence.
+	 */
+
+	int (*invalidate_caches) (struct ttm_bo_device * bdev, uint32_t flags);
+	int (*init_mem_type) (struct ttm_bo_device * bdev, uint32_t type,
+			      struct ttm_mem_type_manager * man);
+	/**
+	 * struct ttm_bo_driver member evict_flags:
+	 *
+	 * @bo: the buffer object to be evicted
+	 *
+	 * Return the bo flags for a buffer which is not mapped to the hardware.
+	 * These will be placed in proposed_flags so that when the move is
+	 * finished, they'll end up in bo->mem.flags
+	 */
+
+	 uint32_t(*evict_flags) (struct ttm_buffer_object * bo);
+	/**
+	 * struct ttm_bo_driver member move:
+	 *
+	 * @bo: the buffer to move
+	 * @evict: whether this motion is evicting the buffer from
+	 * the graphics address space
+	 * @interruptible: Use interruptible sleeps if possible when sleeping.
+	 * @no_wait: whether this should give up and return -EBUSY
+	 * if this move would require sleeping
+	 * @new_mem: the new memory region receiving the buffer
+	 *
+	 * Move a buffer between two memory regions.
+	 */
+	int (*move) (struct ttm_buffer_object * bo,
+		     int evict, int interruptible,
+		     int no_wait, struct ttm_mem_reg * new_mem);
+
+	/**
+	 * struct ttm_bo_driver_member verify_access
+	 *
+	 * @bo: Pointer to a buffer object.
+	 * @filp: Pointer to a struct file trying to access the object.
+	 *
+	 * Called from the map / write / read methods to verify that the
+	 * caller is permitted to access the buffer object.
+	 * This member may be set to NULL, which will refuse this kind of
+	 * access for all buffer objects.
+	 * This function should return 0 if access is granted, -EPERM otherwise.
+	 */
+	int (*verify_access) (struct ttm_buffer_object * bo,
+			      struct file * filp);
+
+	/**
+	 * In case a driver writer dislikes the TTM fence objects,
+	 * the driver writer can replace those with sync objects of
+	 * his / her own. If it turns out that no driver writer is
+	 * using these. I suggest we remove these hooks and plug in
+	 * fences directly. The bo driver needs the following functionality:
+	 * See the corresponding functions in the fence object API
+	 * documentation.
+	 */
+
+	int (*sync_obj_signaled) (void *sync_obj, void *sync_arg);
+	int (*sync_obj_wait) (void *sync_obj, void *sync_arg,
+			      int lazy, int interruptible);
+	int (*sync_obj_flush) (void *sync_obj, void *sync_arg);
+	void (*sync_obj_unref) (void **sync_obj);
+	void *(*sync_obj_ref) (void *sync_obj);
+};
+
+#define TTM_NUM_MEM_TYPES 8
+
+#define TTM_BO_PRIV_FLAG_EVICTED  (1 << 0)	/* Buffer object is evicted. */
+#define TTM_BO_PRIV_FLAG_MOVING   (1 << 1)	/* Buffer object is moving and needs
+						   idling before CPU mapping */
+/**
+ * struct ttm_bo_device - Buffer object driver device-specific data.
+ *
+ * @mem_glob: Pointer to a struct ttm_mem_global object for accounting.
+ * @driver: Pointer to a struct ttm_bo_driver struct setup by the driver.
+ * @count: Current number of buffer object.
+ * @pages: Current number of pinned pages.
+ * @dummy_read_page: Pointer to a dummy page used for mapping requests
+ * of unpopulated pages.
+ * @shrink: A shrink callback object used for buffre object swap.
+ * @ttm_bo_extra_size: Extra size (sizeof(struct ttm_buffer_object) excluded)
+ * used by a buffer object. This is excluding page arrays and backing pages.
+ * @ttm_bo_size: This is @ttm_bo_extra_size + sizeof(struct ttm_buffer_object).
+ * @man: An array of mem_type_managers.
+ * @addr_space_mm: Range manager for the device address space.
+ * lru_lock: Spinlock that protects the buffer+device lru lists and
+ * ddestroy lists.
+ * @nice_mode: Try nicely to wait for buffer idle when cleaning a manager.
+ * If a GPU lockup has been detected, this is forced to 0.
+ * @dev_mapping: A pointer to the struct address_space representing the
+ * device address space.
+ * @wq: Work queue structure for the delayed delete workqueue.
+ *
+ */
+
+struct ttm_bo_device {
+
+	/*
+	 * Constant after bo device init / atomic.
+	 */
+
+	struct ttm_mem_global *mem_glob;
+	struct ttm_bo_driver *driver;
+	struct page *dummy_read_page;
+	struct ttm_mem_shrink shrink;
+
+	size_t ttm_bo_extra_size;
+	size_t ttm_bo_size;
+
+	rwlock_t vm_lock;
+	/*
+	 * Protected by the vm lock.
+	 */
+	struct ttm_mem_type_manager man[TTM_NUM_MEM_TYPES];
+	struct rb_root addr_space_rb;
+	struct drm_mm addr_space_mm;
+
+	/*
+	 * Might want to change this to one lock per manager.
+	 */
+	spinlock_t lru_lock;
+	/*
+	 * Protected by the lru lock.
+	 */
+	struct list_head ddestroy;
+	struct list_head swap_lru;
+
+	/*
+	 * Protected by load / firstopen / lastclose /unload sync.
+	 */
+
+	int nice_mode;
+	struct address_space *dev_mapping;
+
+	/*
+	 * Internal protection.
+	 */
+
+	struct delayed_work wq;
+};
+
+/**
+ * ttm_flag_masked
+ *
+ * @old: Pointer to the result and original value.
+ * @new: New value of bits.
+ * @mask: Mask of bits to change.
+ *
+ * Convenience function to change a number of bits identified by a mask.
+ */
+
+static inline uint32_t
+ttm_flag_masked(uint32_t * old, uint32_t new, uint32_t mask)
+{
+	*old ^= (*old ^ new) & mask;
+	return *old;
+}
+
+/**
+ * ttm_tt_create
+ *
+ * @bdev: pointer to a struct ttm_bo_device:
+ * @size: Size of the data needed backing.
+ * @page_flags: Page flags as identified by TTM_PAGE_FLAG_XX flags.
+ * @dummy_read_page: See struct ttm_bo_device.
+ *
+ * Create a struct ttm_tt to back data with system memory pages.
+ * No pages are actually allocated.
+ * Returns:
+ * NULL: Out of memory.
+ */
+extern struct ttm_tt *ttm_tt_create(struct ttm_bo_device *bdev,
+				    unsigned long size,
+				    uint32_t page_flags,
+				    struct page *dummy_read_page);
+
+/**
+ * ttm_tt_set_user:
+ *
+ * @ttm: The struct ttm_tt to populate.
+ * @tsk: A struct task_struct for which @start is a valid user-space address.
+ * @start: A valid user-space address.
+ * @num_pages: Size in pages of the user memory area.
+ *
+ * Populate a struct ttm_tt with a user-space memory area after first pinning
+ * the pages backing it.
+ * Returns:
+ * !0: Error.
+ */
+
+extern int ttm_tt_set_user(struct ttm_tt *ttm,
+			   struct task_struct *tsk,
+			   unsigned long start, unsigned long num_pages);
+
+/**
+ * ttm_ttm_bind:
+ *
+ * @ttm: The struct ttm_tt containing backing pages.
+ * @bo_mem: The struct ttm_mem_reg identifying the binding location.
+ *
+ * Bind the pages of @ttm to an aperture location identified by @bo_mem
+ */
+extern int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem);
+
+/**
+ * ttm_ttm_destroy:
+ *
+ * @ttm: The struct ttm_tt.
+ *
+ * Unbind, unpopulate and destroy a struct ttm_tt.
+ */
+extern void ttm_tt_destroy(struct ttm_tt *ttm);
+
+/**
+ * ttm_ttm_unbind:
+ *
+ * @ttm: The struct ttm_tt.
+ *
+ * Unbind a struct ttm_tt.
+ */
+extern void ttm_tt_unbind(struct ttm_tt *ttm);
+
+/**
+ * ttm_ttm_destroy:
+ *
+ * @ttm: The struct ttm_tt.
+ * @index: Index of the desired page.
+ *
+ * Return a pointer to the struct page backing @ttm at page
+ * index @index. If the page is unpopulated, one will be allocated to
+ * populate that index.
+ *
+ * Returns:
+ * NULL on OOM.
+ */
+extern struct page *ttm_tt_get_page(struct ttm_tt *ttm, int index);
+
+/**
+ * ttm_tt_cache_flush:
+ *
+ * @pages: An array of pointers to struct page:s to flush.
+ * @num_pages: Number of pages to flush.
+ *
+ * Flush the data of the indicated pages from the cpu caches.
+ * This is used when changing caching attributes of the pages from
+ * cache-coherent.
+ */
+extern void ttm_tt_cache_flush(struct page *pages[], unsigned long num_pages);
+
+/**
+ * ttm_tt_set_placement_caching:
+ *
+ * @ttm A struct ttm_tt the backing pages of which will change caching policy.
+ * @placement: Flag indicating the desired caching policy.
+ *
+ * This function will change caching policy of any default kernel mappings of
+ * the pages backing @ttm. If changing from cached to uncached or write-combined,
+ * all CPU caches will first be flushed to make sure the data of the pages
+ * hit RAM. This function may be very costly as it involves global TLB
+ * and cache flushes and potential page splitting / combining.
+ */
+extern int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement);
+extern int ttm_tt_swapout(struct ttm_tt *ttm,
+			  struct file *persistant_swap_storage);
+
+/*
+ * ttm_bo.c
+ */
+
+/**
+ * ttm_mem_reg_is_pci
+ *
+ * @bdev: Pointer to a struct ttm_bo_device.
+ * @mem: A valid struct ttm_mem_reg.
+ *
+ * Returns 1 if the memory described by @mem is PCI memory,
+ * 0 otherwise.
+ */
+extern int ttm_mem_reg_is_pci(struct ttm_bo_device *bdev,
+			      struct ttm_mem_reg *mem);
+
+/**
+ * ttm_bo_mem_space
+ *
+ * @bo: Pointer to a struct ttm_buffer_object. the data of which
+ * we want to allocate space for.
+ * @mem: A struct ttm_mem_reg with the struct ttm_mem_reg::proposed_flags set
+ * up.
+ * @interruptible: Sleep interruptible when sliping.
+ * @no_wait: Don't sleep waiting for space to become available.
+ *
+ * Allocate memory space for the buffer object pointed to by @bo, using
+ * the placement flags in @mem, potentially evicting other idle buffer objects.
+ * This function may sleep while waiting for space to become available.
+ * Returns:
+ * -EBUSY: No space available (only if no_wait == 1).
+ * -ENOMEM: Could not allocate memory for the buffer object, either due to
+ * fragmentation or concurrent allocators.
+ * -ERESTART: An interruptible sleep was interrupted by a signal.
+ */
+extern int ttm_bo_mem_space(struct ttm_buffer_object *bo,
+			    struct ttm_mem_reg *mem,
+			    int interruptible, int no_wait);
+/**
+ * ttm_bo_wait_for_cpu
+ *
+ * @bo: Pointer to a struct ttm_buffer_object.
+ * @no_wait: Don't sleep while waiting.
+ *
+ * Wait until a buffer object is no longer sync'ed for CPU access.
+ * Returns:
+ * -EBUSY: Buffer object was sync'ed for CPU access. (only if no_wait == 1).
+ * -ERESTART: An interruptible sleep was interrupted by a signal.
+ */
+
+extern int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, int no_wait);
+
+/**
+ * ttm_bo_pci_offset - Get the PCI offset for the buffer object memory.
+ *
+ * @bo Pointer to a struct ttm_buffer_object.
+ * @bus_base On return the base of the PCI region
+ * @bus_offset On return the byte offset into the PCI region
+ * @bus_size On return the byte size of the buffer object or zero if
+ * the buffer object memory is not accessible through a PCI region.
+ *
+ * Returns:
+ * -EINVAL if the buffer object is currently not mappable.
+ * 0 otherwise.
+ */
+
+extern int ttm_bo_pci_offset(struct ttm_bo_device *bdev,
+			     struct ttm_mem_reg *mem,
+			     unsigned long *bus_base,
+			     unsigned long *bus_offset,
+			     unsigned long *bus_size);
+
+extern int ttm_bo_device_release(struct ttm_bo_device *bdev);
+
+/**
+ * ttm_bo_device_init
+ *
+ * @bdev: A pointer to a struct ttm_bo_device to initialize.
+ * @mem_global: A pointer to an initialized struct ttm_mem_global.
+ * @driver: A pointer to a struct ttm_bo_driver set up by the caller.
+ * @file_page_offset: Offset into the device address space that is available
+ * for buffer data. This ensures compatibility with other users of the
+ * address space.
+ *
+ * Initializes a struct ttm_bo_device:
+ * Returns:
+ * !0: Failure.
+ */
+extern int ttm_bo_device_init(struct ttm_bo_device *bdev,
+			      struct ttm_mem_global *mem_glob,
+			      struct ttm_bo_driver *driver,
+			      uint64_t file_page_offset);
+
+/**
+ * ttm_bo_reserve:
+ *
+ * @bo: A pointer to a struct ttm_buffer_object.
+ * @interruptible: Sleep interruptible if waiting.
+ * @no_wait: Don't sleep while trying to reserve, rather return -EBUSY.
+ * @use_sequence: If @bo is already reserved, Only sleep waiting for
+ * it to become unreserved if @sequence < (@bo)->sequence.
+ *
+ * Locks a buffer object for validation. (Or prevents other processes from
+ * locking it for validation) and removes it from lru lists, while taking
+ * a number of measures to prevent deadlocks.
+ *
+ * Deadlocks may occur when two processes try to reserve multiple buffers in
+ * different order, either by will or as a result of a buffer being evicted
+ * to make room for a buffer already reserved. (Buffers are reserved before
+ * they are evicted). The following algorithm prevents such deadlocks from
+ * occuring:
+ * 1) Buffers are reserved with the lru spinlock held. Upon successful
+ * reservation they are removed from the lru list. This stops a reserved buffer
+ * from being evicted. However the lru spinlock is released between the time
+ * a buffer is selected for eviction and the time it is reserved.
+ * Therefore a check is made when a buffer is reserved for eviction, that it
+ * is still the first buffer in the lru list, before it is removed from the
+ * list. @check_lru == 1 forces this check. If it fails, the function returns
+ * -EINVAL, and the caller should then choose a new buffer to evict and repeat
+ * the procedure.
+ * 2) Processes attempting to reserve multiple buffers other than for eviction,
+ * (typically execbuf), should first obtain a unique 32-bit
+ * validation sequence number,
+ * and call this function with @use_sequence == 1 and @sequence == the unique
+ * sequence number. If upon call of this function, the buffer object is already
+ * reserved, the validation sequence is checked against the validation
+ * sequence of the process currently reserving the buffer,
+ * and if the current validation sequence is greater than that of the process
+ * holding the reservation, the function returns -EAGAIN. Otherwise it sleeps
+ * waiting for the buffer to become unreserved, after which it retries reserving.
+ * The caller should, when receiving an -EAGAIN error
+ * release all its buffer reservations, wait for @bo to become unreserved, and
+ * then rerun the validation with the same validation sequence. This procedure
+ * will always guarantee that the process with the lowest validation sequence
+ * will eventually succeed, preventing both deadlocks and starvation.
+ *
+ * Returns:
+ * -EAGAIN: The reservation may cause a deadlock. Release all buffer reservations,
+ * wait for @bo to become unreserved and try again. (only if use_sequence == 1).
+ * -ERESTART: A wait for the buffer to become unreserved was interrupted by
+ * a signal. Release all buffer reservations and return to user-space.
+ */
+extern int ttm_bo_reserve(struct ttm_buffer_object *bo,
+			  int interruptible,
+			  int no_wait, int use_sequence, uint32_t sequence);
+
+/**
+ * ttm_bo_unreserve
+ *
+ * @bo: A pointer to a struct ttm_buffer_object.
+ *
+ * Unreserve a previous reservation of @bo.
+ */
+extern void ttm_bo_unreserve(struct ttm_buffer_object *bo);
+
+/**
+ * ttm_bo_wait_unreserved
+ *
+ * @bo: A pointer to a struct ttm_buffer_object.
+ *
+ * Wait for a struct ttm_buffer_object to become unreserved.
+ * This is typically used in the execbuf code to relax cpu-usage when
+ * a potential deadlock condition backoff.
+ */
+extern int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo,
+				  int interruptible);
+
+/**
+ * ttm_bo_block_reservation
+ *
+ * @bo: A pointer to a struct ttm_buffer_object.
+ * @interruptible: Use interruptible sleep when waiting.
+ * @no_wait: Don't sleep, but rather return -EBUSY.
+ *
+ * Block reservation for validation by simply reserving the buffer. This is intended
+ * for single buffer use only without eviction, and thus needs no deadlock protection.
+ *
+ * Returns:
+ * -EBUSY: If no_wait == 1 and the buffer is already reserved.
+ * -ERESTART: If interruptible == 1 and the process received a signal while sleeping.
+ */
+extern int ttm_bo_block_reservation(struct ttm_buffer_object *bo,
+				    int interruptible, int no_wait);
+
+/**
+ * ttm_bo_unblock_reservation
+ *
+ * @bo: A pointer to a struct ttm_buffer_object.
+ *
+ * Unblocks reservation leaving lru lists untouched.
+ */
+extern void ttm_bo_unblock_reservation(struct ttm_buffer_object *bo);
+
+/*
+ * ttm_bo_util.c
+ */
+
+/**
+ * ttm_bo_move_ttm
+ *
+ * @bo: A pointer to a struct ttm_buffer_object.
+ * @evict: 1: This is an eviction. Don't try to pipeline.
+ * @no_wait: Never sleep, but rather return with -EBUSY.
+ * @new_mem: struct ttm_mem_reg indicating where to move.
+ *
+ * Optimized move function for a buffer object with both old and
+ * new placement backed by a TTM. The function will, if successful,
+ * free any old aperture space, and set (@new_mem)->mm_node to NULL,
+ * and update the (@bo)->mem placement flags. If unsuccessful, the old
+ * data remains untouched, and it's up to the caller to free the
+ * memory space indicated by @new_mem.
+ * Returns:
+ * !0: Failure.
+ */
+
+extern int ttm_bo_move_ttm(struct ttm_buffer_object *bo,
+			   int evict, int no_wait, struct ttm_mem_reg *new_mem);
+
+/**
+ * ttm_bo_move_memcpy
+ *
+ * @bo: A pointer to a struct ttm_buffer_object.
+ * @evict: 1: This is an eviction. Don't try to pipeline.
+ * @no_wait: Never sleep, but rather return with -EBUSY.
+ * @new_mem: struct ttm_mem_reg indicating where to move.
+ *
+ * Fallback move function for a mappable buffer object in mappable memory.
+ * The function will, if successful,
+ * free any old aperture space, and set (@new_mem)->mm_node to NULL,
+ * and update the (@bo)->mem placement flags. If unsuccessful, the old
+ * data remains untouched, and it's up to the caller to free the
+ * memory space indicated by @new_mem.
+ * Returns:
+ * !0: Failure.
+ */
+
+extern int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
+			      int evict,
+			      int no_wait, struct ttm_mem_reg *new_mem);
+
+/**
+ * ttm_bo_free_old_node
+ *
+ * @bo: A pointer to a struct ttm_buffer_object.
+ *
+ * Utility function to free an old placement after a successful move.
+ */
+extern void ttm_bo_free_old_node(struct ttm_buffer_object *bo);
+
+/**
+ * ttm_bo_move_accel_cleanup.
+ *
+ * @bo: A pointer to a struct ttm_buffer_object.
+ * @sync_obj: A sync object that signals when moving is complete.
+ * @sync_obj_arg: An argument to pass to the sync object idle / wait
+ * functions.
+ * @evict: This is an evict move. Don't return until the buffer is idle.
+ * @no_wait: Never sleep, but rather return with -EBUSY.
+ * @new_mem: struct ttm_mem_reg indicating where to move.
+ *
+ * Accelerated move function to be called when an accelerated move
+ * has been scheduled. The function will create a new temporary buffer object
+ * representing the old placement, and put the sync object on both buffer
+ * objects. After that the newly created buffer object is unref'd to be
+ * destroyed when the move is complete. This will help pipeline
+ * buffer moves.
+ */
+
+extern int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
+				     void *sync_obj,
+				     void *sync_obj_arg,
+				     int evict, int no_wait,
+				     struct ttm_mem_reg *new_mem);
+/**
+ * ttm_io_prot
+ *
+ * @c_state: Caching state.
+ * @tmp: Page protection flag for a normal, cached mapping.
+ *
+ * Utility function that returns the pgprot_t that should be used for
+ * setting up a PTE with the caching model indicated by @c_state.
+ */
+extern pgprot_t ttm_io_prot(enum ttm_caching_state c_state, pgprot_t tmp);
+
+#if (defined(CONFIG_AGP) || (defined(CONFIG_AGP_MODULE) && defined(MODULE)))
+#define TTM_HAS_AGP
+#include <linux/agp_backend.h>
+
+/**
+ * ttm_agp_backend_init
+ *
+ * @bdev: Pointer to a struct ttm_bo_device.
+ * @bridge: The agp bridge this device is sitting on.
+ *
+ * Create a TTM backend that uses the indicated AGP bridge as an aperture
+ * for TT memory. This function uses the linux agpgart interface to
+ * bind and unbind memory backing a ttm_tt.
+ */
+extern struct ttm_backend *ttm_agp_backend_init(struct ttm_bo_device *bdev,
+						struct agp_bridge_data *bridge);
+#endif
+
+#endif

linux-core/ttm/ttm_bo_util.c

@@ -0,0 +1,490 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2007-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
+ * All Rights Reserved.
+ * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellström <thomas-at-tungstengraphics-dot-com>
+ */
+
+#include "ttm/ttm_bo_driver.h"
+#include "ttm/ttm_placement_common.h"
+#include "ttm/ttm_pat_compat.h"
+#include <linux/io.h>
+#include <linux/highmem.h>
+#include <linux/wait.h>
+#include <linux/version.h>
+
+void ttm_bo_free_old_node(struct ttm_buffer_object *bo)
+{
+	struct ttm_mem_reg *old_mem = &bo->mem;
+
+	if (old_mem->mm_node) {
+		spin_lock(&bo->bdev->lru_lock);
+		drm_mm_put_block(old_mem->mm_node);
+		spin_unlock(&bo->bdev->lru_lock);
+	}
+	old_mem->mm_node = NULL;
+}
+
+int ttm_bo_move_ttm(struct ttm_buffer_object *bo,
+		    int evict, int no_wait, struct ttm_mem_reg *new_mem)
+{
+	struct ttm_tt *ttm = bo->ttm;
+	struct ttm_mem_reg *old_mem = &bo->mem;
+	uint32_t save_flags = old_mem->flags;
+	uint32_t save_proposed_flags = old_mem->proposed_flags;
+	int ret;
+
+	if (old_mem->mem_type != TTM_PL_SYSTEM) {
+		ttm_tt_unbind(ttm);
+		ttm_bo_free_old_node(bo);
+		ttm_flag_masked(&old_mem->flags, TTM_PL_FLAG_SYSTEM,
+				TTM_PL_MASK_MEM);
+		old_mem->mem_type = TTM_PL_SYSTEM;
+		save_flags = old_mem->flags;
+	}
+
+	ret = ttm_tt_set_placement_caching(ttm, new_mem->flags);
+	if (unlikely(ret != 0))
+		return ret;
+
+	if (new_mem->mem_type != TTM_PL_SYSTEM) {
+		ret = ttm_tt_bind(ttm, new_mem);
+		if (unlikely(ret != 0))
+			return ret;
+	}
+
+	*old_mem = *new_mem;
+	new_mem->mm_node = NULL;
+	old_mem->proposed_flags = save_proposed_flags;
+	ttm_flag_masked(&save_flags, new_mem->flags, TTM_PL_MASK_MEMTYPE);
+	return 0;
+}
+
+int ttm_mem_reg_ioremap(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem,
+			void **virtual)
+{
+	struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
+	unsigned long bus_offset;
+	unsigned long bus_size;
+	unsigned long bus_base;
+	int ret;
+	void *addr;
+
+	*virtual = NULL;
+	ret = ttm_bo_pci_offset(bdev, mem, &bus_base, &bus_offset, &bus_size);
+	if (ret || bus_size == 0)
+		return ret;
+
+	if (!(man->flags & TTM_MEMTYPE_FLAG_NEEDS_IOREMAP))
+		addr = (void *)(((u8 *) man->io_addr) + bus_offset);
+	else {
+#if  (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,26))
+		if (mem->flags & TTM_PL_FLAG_WC)
+			addr = ioremap_wc(bus_base + bus_offset, bus_size);
+		else
+			addr = ioremap_nocache(bus_base + bus_offset, bus_size);
+#else
+		addr = ioremap_nocache(bus_base + bus_offset, bus_size);
+#endif
+		if (!addr)
+			return -ENOMEM;
+	}
+	*virtual = addr;
+	return 0;
+}
+
+void ttm_mem_reg_iounmap(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem,
+			 void *virtual)
+{
+	struct ttm_mem_type_manager *man;
+
+	man = &bdev->man[mem->mem_type];
+
+	if (virtual && (man->flags & TTM_MEMTYPE_FLAG_NEEDS_IOREMAP))
+		iounmap(virtual);
+}
+
+static int ttm_copy_io_page(void *dst, void *src, unsigned long page)
+{
+	uint32_t *dstP =
+	    (uint32_t *) ((unsigned long)dst + (page << PAGE_SHIFT));
+	uint32_t *srcP =
+	    (uint32_t *) ((unsigned long)src + (page << PAGE_SHIFT));
+
+	int i;
+	for (i = 0; i < PAGE_SIZE / sizeof(uint32_t); ++i)
+		iowrite32(ioread32(srcP++), dstP++);
+	return 0;
+}
+
+static int ttm_copy_io_ttm_page(struct ttm_tt *ttm, void *src,
+				unsigned long page)
+{
+	struct page *d = ttm_tt_get_page(ttm, page);
+	void *dst;
+
+	if (!d)
+		return -ENOMEM;
+
+	src = (void *)((unsigned long)src + (page << PAGE_SHIFT));
+	dst = kmap(d);
+	if (!dst)
+		return -ENOMEM;
+
+	memcpy_fromio(dst, src, PAGE_SIZE);
+	kunmap(d);
+	return 0;
+}
+
+static int ttm_copy_ttm_io_page(struct ttm_tt *ttm, void *dst,
+				unsigned long page)
+{
+	struct page *s = ttm_tt_get_page(ttm, page);
+	void *src;
+
+	if (!s)
+		return -ENOMEM;
+
+	dst = (void *)((unsigned long)dst + (page << PAGE_SHIFT));
+	src = kmap(s);
+	if (!src)
+		return -ENOMEM;
+
+	memcpy_toio(dst, src, PAGE_SIZE);
+	kunmap(s);
+	return 0;
+}
+
+int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
+		       int evict, int no_wait, struct ttm_mem_reg *new_mem)
+{
+	struct ttm_bo_device *bdev = bo->bdev;
+	struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
+	struct ttm_tt *ttm = bo->ttm;
+	struct ttm_mem_reg *old_mem = &bo->mem;
+	struct ttm_mem_reg old_copy = *old_mem;
+	void *old_iomap;
+	void *new_iomap;
+	int ret;
+	uint32_t save_flags = old_mem->flags;
+	uint32_t save_proposed_flags = old_mem->proposed_flags;
+	unsigned long i;
+	unsigned long page;
+	unsigned long add = 0;
+	int dir;
+
+	ret = ttm_mem_reg_ioremap(bdev, old_mem, &old_iomap);
+	if (ret)
+		return ret;
+	ret = ttm_mem_reg_ioremap(bdev, new_mem, &new_iomap);
+	if (ret)
+		goto out;
+
+	if (old_iomap == NULL && new_iomap == NULL)
+		goto out2;
+	if (old_iomap == NULL && ttm == NULL)
+		goto out2;
+
+	add = 0;
+	dir = 1;
+
+	if ((old_mem->mem_type == new_mem->mem_type) &&
+	    (new_mem->mm_node->start <
+	     old_mem->mm_node->start + old_mem->mm_node->size)) {
+		dir = -1;
+		add = new_mem->num_pages - 1;
+	}
+
+	for (i = 0; i < new_mem->num_pages; ++i) {
+		page = i * dir + add;
+		if (old_iomap == NULL)
+			ret = ttm_copy_ttm_io_page(ttm, new_iomap, page);
+		else if (new_iomap == NULL)
+			ret = ttm_copy_io_ttm_page(ttm, old_iomap, page);
+		else
+			ret = ttm_copy_io_page(new_iomap, old_iomap, page);
+		if (ret)
+			goto out1;
+	}
+	mb();
+      out2:
+	ttm_bo_free_old_node(bo);
+
+	*old_mem = *new_mem;
+	new_mem->mm_node = NULL;
+	old_mem->proposed_flags = save_proposed_flags;
+	ttm_flag_masked(&save_flags, new_mem->flags, TTM_PL_MASK_MEMTYPE);
+
+	if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && (ttm != NULL)) {
+		ttm_tt_unbind(ttm);
+		ttm_tt_destroy(ttm);
+		bo->ttm = NULL;
+	}
+
+      out1:
+	ttm_mem_reg_iounmap(bdev, new_mem, new_iomap);
+      out:
+	ttm_mem_reg_iounmap(bdev, &old_copy, old_iomap);
+	return ret;
+}
+
+/**
+ * ttm_buffer_object_transfer
+ *
+ * @bo: A pointer to a struct ttm_buffer_object.
+ * @new_obj: A pointer to a pointer to a newly created ttm_buffer_object,
+ * holding the data of @bo with the old placement.
+ *
+ * This is a utility function that may be called after an accelerated move
+ * has been scheduled. A new buffer object is created as a placeholder for
+ * the old data while it's being copied. When that buffer object is idle,
+ * it can be destroyed, releasing the space of the old placement.
+ * Returns:
+ * !0: Failure.
+ */
+
+static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
+				      struct ttm_buffer_object **new_obj)
+{
+	struct ttm_buffer_object *fbo;
+	struct ttm_bo_device *bdev = bo->bdev;
+	struct ttm_bo_driver *driver = bdev->driver;
+
+	fbo = kzalloc(sizeof(*fbo), GFP_KERNEL);
+	if (!fbo)
+		return -ENOMEM;
+
+	*fbo = *bo;
+	mutex_init(&fbo->mutex);
+	mutex_lock(&fbo->mutex);
+
+	init_waitqueue_head(&fbo->event_queue);
+	INIT_LIST_HEAD(&fbo->ddestroy);
+	INIT_LIST_HEAD(&fbo->lru);
+
+	fbo->sync_obj = driver->sync_obj_ref(bo->sync_obj);
+	if (fbo->mem.mm_node)
+		fbo->mem.mm_node->private = (void *)fbo;
+	kref_init(&fbo->list_kref);
+	kref_init(&fbo->kref);
+
+	mutex_unlock(&fbo->mutex);
+
+	*new_obj = fbo;
+	return 0;
+}
+
+pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp)
+{
+#if defined(__i386__) || defined(__x86_64__)
+	if (caching_flags & TTM_PL_FLAG_WC) {
+		tmp = pgprot_ttm_x86_wc(tmp);
+	} else if (boot_cpu_data.x86 > 3) {
+		tmp = pgprot_noncached(tmp);
+	}
+#elif defined(__powerpc__)
+	if (!(caching_flags & TTM_PL_FLAG_CACHED)) {
+		pgprot_val(tmp) |= _PAGE_NO_CACHE;
+		if (caching_flags & TTM_PL_FLAG_UNCACHED)
+			pgprot_val(tmp) |= _PAGE_GUARDED;
+	}
+#endif
+#if defined(__ia64__)
+	if (caching_flags & TTM_PL_FLAG_WC)
+		tmp = pgprot_writecombine(tmp);
+	else
+		tmp = pgprot_noncached(tmp);
+#endif
+#if defined(__sparc__)
+	if (!(caching_flags & TTM_PL_FLAG_CACHED)
+	    tmp = pgprot_noncached(tmp);
+#endif
+	    return tmp;}
+
+	    static int ttm_bo_ioremap(struct ttm_buffer_object *bo,
+				      unsigned long bus_base,
+				      unsigned long bus_offset,
+				      unsigned long bus_size,
+				      struct ttm_bo_kmap_obj *map) {
+	    struct ttm_bo_device * bdev = bo->bdev;
+	    struct ttm_mem_reg * mem = &bo->mem;
+	    struct ttm_mem_type_manager * man = &bdev->man[mem->mem_type];
+	    if (!(man->flags & TTM_MEMTYPE_FLAG_NEEDS_IOREMAP)) {
+	    map->bo_kmap_type = ttm_bo_map_premapped;
+	    map->virtual = (void *)(((u8 *) man->io_addr) + bus_offset);} else {
+	    map->bo_kmap_type = ttm_bo_map_iomap;
+#if  (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,26))
+	    if (mem->flags & TTM_PL_FLAG_WC)
+	    map->virtual = ioremap_wc(bus_base + bus_offset, bus_size);
+	    else
+	    map->virtual = ioremap_nocache(bus_base + bus_offset, bus_size);
+#else
+	    map->virtual = ioremap_nocache(bus_base + bus_offset, bus_size);
+#endif
+	    }
+	    return (!map->virtual) ? -ENOMEM : 0;}
+
+	    static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
+				       unsigned long start_page,
+				       unsigned long num_pages,
+				       struct ttm_bo_kmap_obj *map) {
+	    struct ttm_mem_reg * mem = &bo->mem; pgprot_t prot;
+	    struct ttm_tt * ttm = bo->ttm; struct page * d; int i; BUG_ON(!ttm);
+	    if (num_pages == 1 && (mem->flags & TTM_PL_FLAG_CACHED)) {
+
+	    /*
+	     * We're mapping a single page, and the desired
+	     * page protection is consistent with the bo.
+	     */
+
+	    map->bo_kmap_type = ttm_bo_map_kmap;
+	    map->page = ttm_tt_get_page(ttm, start_page);
+	    map->virtual = kmap(map->page);}
+	    else {
+	    /*
+	     * Populate the part we're mapping;
+	     */
+
+	    for (i = start_page; i < start_page + num_pages; ++i) {
+	    d = ttm_tt_get_page(ttm, i); if (!d)
+	    return -ENOMEM;}
+
+	    /*
+	     * We need to use vmap to get the desired page protection
+	     * or to make the buffer object look contigous.
+	     */
+
+	    prot = (mem->flags & TTM_PL_FLAG_CACHED) ?
+	    PAGE_KERNEL :
+	    ttm_io_prot(mem->flags, PAGE_KERNEL);
+	    map->bo_kmap_type = ttm_bo_map_vmap;
+	    map->virtual = vmap(ttm->pages + start_page, num_pages, 0, prot);}
+	    return (!map->virtual) ? -ENOMEM : 0;}
+
+	    int ttm_bo_kmap(struct ttm_buffer_object *bo,
+			    unsigned long start_page, unsigned long num_pages,
+			    struct ttm_bo_kmap_obj *map) {
+	    int ret; unsigned long bus_base; unsigned long bus_offset;
+	    unsigned long bus_size; BUG_ON(!list_empty(&bo->swap));
+	    map->virtual = NULL; if (num_pages > bo->num_pages)
+	    return -EINVAL; if (start_page > bo->num_pages)
+	    return -EINVAL;
+#if 0
+	    if (num_pages > 1 && !DRM_SUSER(DRM_CURPROC))
+	    return -EPERM;
+#endif
+	    ret = ttm_bo_pci_offset(bo->bdev, &bo->mem, &bus_base,
+				    &bus_offset, &bus_size); if (ret)
+	    return ret; if (bus_size == 0) {
+	    return ttm_bo_kmap_ttm(bo, start_page, num_pages, map);}
+	    else {
+	    bus_offset += start_page << PAGE_SHIFT;
+	    bus_size = num_pages << PAGE_SHIFT;
+	    return ttm_bo_ioremap(bo, bus_base, bus_offset, bus_size, map);}
+	    }
+
+	    void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map) {
+	    if (!map->virtual)
+	    return; switch (map->bo_kmap_type) {
+case ttm_bo_map_iomap:
+iounmap(map->virtual); break; case ttm_bo_map_vmap:
+vunmap(map->virtual); break; case ttm_bo_map_kmap:
+kunmap(map->page); break; case ttm_bo_map_premapped:
+break; default:
+	    BUG();}
+	    map->virtual = NULL; map->page = NULL;}
+
+	    int ttm_bo_pfn_prot(struct ttm_buffer_object *bo,
+				unsigned long dst_offset,
+				unsigned long *pfn, pgprot_t * prot) {
+	    struct ttm_mem_reg * mem = &bo->mem;
+	    struct ttm_bo_device * bdev = bo->bdev;
+	    unsigned long bus_offset;
+	    unsigned long bus_size;
+	    unsigned long bus_base;
+	    int ret;
+	    ret = ttm_bo_pci_offset(bdev, mem, &bus_base, &bus_offset,
+				    &bus_size); if (ret)
+	    return -EINVAL; if (bus_size != 0)
+	    * pfn = (bus_base + bus_offset + dst_offset) >> PAGE_SHIFT;
+	    else
+	    if (!bo->ttm)
+	    return -EINVAL;
+	    else
+	    *pfn =
+	    page_to_pfn(ttm_tt_get_page(bo->ttm, dst_offset >> PAGE_SHIFT));
+	    *prot =
+	    (mem->flags & TTM_PL_FLAG_CACHED) ? PAGE_KERNEL : ttm_io_prot(mem->
+									  flags,
+									  PAGE_KERNEL);
+	    return 0;}
+
+	    int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
+					  void *sync_obj,
+					  void *sync_obj_arg,
+					  int evict, int no_wait,
+					  struct ttm_mem_reg *new_mem) {
+	    struct ttm_bo_device * bdev = bo->bdev;
+	    struct ttm_bo_driver * driver = bdev->driver;
+	    struct ttm_mem_type_manager * man = &bdev->man[new_mem->mem_type];
+	    struct ttm_mem_reg * old_mem = &bo->mem;
+	    int ret;
+	    uint32_t save_flags = old_mem->flags;
+	    uint32_t save_proposed_flags = old_mem->proposed_flags;
+	    struct ttm_buffer_object * old_obj; if (bo->sync_obj)
+	    driver->sync_obj_unref(&bo->sync_obj);
+	    bo->sync_obj = driver->sync_obj_ref(sync_obj);
+	    bo->sync_obj_arg = sync_obj_arg; if (evict) {
+	    ret = ttm_bo_wait(bo, 0, 0, 0); if (ret)
+	    return ret;
+	    ttm_bo_free_old_node(bo);
+	    if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && (bo->ttm != NULL)) {
+	    ttm_tt_unbind(bo->ttm); ttm_tt_destroy(bo->ttm); bo->ttm = NULL;}
+	    }
+	    else {
+
+	    /* This should help pipeline ordinary buffer moves.
+	     *
+	     * Hang old buffer memory on a new buffer object,
+	     * and leave it to be released when the GPU
+	     * operation has completed.
+	     */
+
+	    ret = ttm_buffer_object_transfer(bo, &old_obj); if (ret)
+	    return ret; if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED))
+	    old_obj->ttm = NULL;
+	    else
+	    bo->ttm = NULL;
+	    bo->priv_flags |= TTM_BO_PRIV_FLAG_MOVING;
+	    ttm_bo_unreserve(old_obj);}
+
+	    *old_mem = *new_mem;
+	    new_mem->mm_node = NULL;
+	    old_mem->proposed_flags = save_proposed_flags;
+	    ttm_flag_masked(&save_flags, new_mem->flags, TTM_PL_MASK_MEMTYPE);
+	    return 0;}

linux-core/ttm/ttm_bo_vm.c

@@ -0,0 +1,584 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2006-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
+ * All Rights Reserved.
+ * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
+ */
+
+#include "ttm/ttm_bo_driver.h"
+#include "ttm/ttm_placement_common.h"
+#include <linux/mm.h>
+#include <linux/version.h>
+#include <linux/rbtree.h>
+#include <asm/uaccess.h>
+
+#define TTM_BO_VM_NUM_PREFAULT 16
+
+static struct ttm_buffer_object *ttm_bo_vm_lookup_rb(struct ttm_bo_device *bdev,
+						     unsigned long page_start,
+						     unsigned long num_pages)
+{
+	struct rb_node *cur = bdev->addr_space_rb.rb_node;
+	unsigned long cur_offset;
+	struct ttm_buffer_object *bo;
+	struct ttm_buffer_object *best_bo = NULL;
+
+	while (likely(cur != NULL)) {
+		bo = rb_entry(cur, struct ttm_buffer_object, vm_rb);
+		cur_offset = bo->vm_node->start;
+		if (page_start >= cur_offset) {
+			cur = cur->rb_right;
+			best_bo = bo;
+			if (page_start == cur_offset)
+				break;
+		} else
+			cur = cur->rb_left;
+	}
+
+	if (unlikely(best_bo == NULL))
+		return NULL;
+
+	if (unlikely((best_bo->vm_node->start + best_bo->num_pages) <
+		     (page_start + num_pages)))
+		return NULL;
+
+	return best_bo;
+}
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,25))
+static int ttm_bo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+	struct ttm_buffer_object *bo = (struct ttm_buffer_object *)
+	    vma->vm_private_data;
+	struct ttm_bo_device *bdev = bo->bdev;
+	unsigned long bus_base;
+	unsigned long bus_offset;
+	unsigned long bus_size;
+	unsigned long page_offset;
+	unsigned long page_last;
+	unsigned long pfn;
+	struct ttm_tt *ttm = NULL;
+	struct page *page;
+	int ret;
+	int i;
+	int is_iomem;
+	unsigned long address = (unsigned long)vmf->virtual_address;
+	int retval = VM_FAULT_NOPAGE;
+
+	ret = ttm_bo_reserve(bo, 1, 0, 0, 0);
+	if (unlikely(ret != 0))
+		return VM_FAULT_NOPAGE;
+
+	mutex_lock(&bo->mutex);
+
+	/*
+	 * Wait for buffer data in transit, due to a pipelined
+	 * move.
+	 */
+
+	if (bo->priv_flags & TTM_BO_PRIV_FLAG_MOVING) {
+		ret = ttm_bo_wait(bo, 0, 1, 0);
+		if (unlikely(ret != 0)) {
+			if (ret == -ERESTART)
+				printk(KERN_INFO "Restart nopage.\n");
+
+			retval = (ret != -ERESTART) ?
+			    VM_FAULT_SIGBUS : VM_FAULT_NOPAGE;
+			goto out_unlock;
+		}
+	}
+
+	ret = ttm_bo_pci_offset(bdev, &bo->mem, &bus_base, &bus_offset,
+				&bus_size);
+	if (unlikely(ret != 0)) {
+		retval = VM_FAULT_SIGBUS;
+		goto out_unlock;
+	}
+
+	is_iomem = (bus_size != 0);
+
+	page_offset = ((address - vma->vm_start) >> PAGE_SHIFT) +
+	    bo->vm_node->start - vma->vm_pgoff;
+	page_last = ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT) +
+	    bo->vm_node->start - vma->vm_pgoff;
+
+	if (unlikely(page_offset >= bo->num_pages)) {
+		retval = VM_FAULT_SIGBUS;
+		goto out_unlock;
+	}
+
+	/*
+	 * Strictly, we're not allowed to modify vma->vm_page_prot here,
+	 * since the mmap_sem is only held in read mode. However, we
+	 * modify only the caching bits of vma->vm_page_prot and
+	 * consider those bits protected by
+	 * the bo->mutex, as we should be the only writers.
+	 * There shouldn't really be any readers of these bits except
+	 * within vm_insert_pfn()? fork?
+	 *
+	 * TODO: Add a list of vmas to the bo, and change the
+	 * vma->vm_page_prot when the object changes caching policy, with
+	 * the correct locks held.
+	 */
+
+	if (is_iomem) {
+		vma->vm_page_prot = ttm_io_prot(bo->mem.flags,
+						vma->vm_page_prot);
+	} else {
+		ttm = bo->ttm;
+		vma->vm_page_prot = (bo->mem.flags & TTM_PL_FLAG_CACHED) ?
+		    vm_get_page_prot(vma->vm_flags) :
+		    ttm_io_prot(bo->mem.flags, vma->vm_page_prot);
+	}
+
+	/*
+	 * Speculatively prefault a number of pages. Only error on
+	 * first page.
+	 */
+
+	for (i = 0; i < TTM_BO_VM_NUM_PREFAULT; ++i) {
+
+		if (is_iomem)
+			pfn = ((bus_base + bus_offset) >> PAGE_SHIFT) +
+			    page_offset;
+		else {
+			page = ttm_tt_get_page(ttm, page_offset);
+			if (unlikely(!page && i == 0)) {
+				retval = VM_FAULT_OOM;
+				goto out_unlock;
+			} else if (unlikely(!page)) {
+				break;
+			}
+			pfn = page_to_pfn(page);
+		}
+
+		ret = vm_insert_pfn(vma, address, pfn);
+
+		/*
+		 * Somebody beat us to this PTE or prefaulting to
+		 * an already populated PTE, or prefaulting error.
+		 */
+
+		if (unlikely((ret == -EBUSY) || (ret != 0 && i > 0)))
+			break;
+		else if (unlikely(ret != 0)) {
+			retval =
+			    (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS;
+			goto out_unlock;
+
+		}
+
+		address += PAGE_SIZE;
+		if (unlikely(++page_offset >= page_last))
+			break;
+	}
+
+      out_unlock:
+	mutex_unlock(&bo->mutex);
+	ttm_bo_unreserve(bo);
+	return retval;
+}
+
+#else
+
+static unsigned long ttm_bo_vm_nopfn(struct vm_area_struct *vma,
+				     unsigned long address)
+{
+	struct ttm_buffer_object *bo = (struct ttm_buffer_object *)
+	    vma->vm_private_data;
+	struct ttm_bo_device *bdev = bo->bdev;
+	unsigned long bus_base;
+	unsigned long bus_offset;
+	unsigned long bus_size;
+	unsigned long page_offset;
+	unsigned long page_last;
+	unsigned long pfn;
+	struct ttm_tt *ttm = NULL;
+	struct page *page;
+	int ret;
+	int i;
+	int is_iomem;
+	unsigned long retval = NOPFN_REFAULT;
+
+	ret = ttm_bo_reserve(bo, 1, 0, 0, 0);
+	if (unlikely(ret != 0))
+		return NOPFN_REFAULT;
+
+	mutex_lock(&bo->mutex);
+
+	/*
+	 * Wait for buffer data in transit, due to a pipelined
+	 * move.
+	 */
+
+	if (bo->priv_flags & TTM_BO_PRIV_FLAG_MOVING) {
+		ret = ttm_bo_wait(bo, 0, 1, 0);
+		if (unlikely(ret != 0)) {
+			retval = (ret != -ERESTART) ?
+			    NOPFN_SIGBUS : NOPFN_REFAULT;
+			goto out_unlock;
+		}
+	}
+
+	ret = ttm_bo_pci_offset(bdev, &bo->mem, &bus_base, &bus_offset,
+				&bus_size);
+	if (unlikely(ret != 0)) {
+		printk(KERN_ERR "Attempted buffer object access "
+		       "of unmappable object.\n");
+		retval = NOPFN_SIGBUS;
+		goto out_unlock;
+	}
+
+	is_iomem = (bus_size != 0);
+
+	page_offset = ((address - vma->vm_start) >> PAGE_SHIFT) +
+	    bo->vm_node->start - vma->vm_pgoff;
+
+	page_last = ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT) +
+	    bo->vm_node->start - vma->vm_pgoff;
+
+	if (unlikely(page_offset >= bo->num_pages)) {
+		printk(KERN_ERR "Attempted buffer object access "
+		       "outside object.\n");
+		retval = NOPFN_SIGBUS;
+		goto out_unlock;
+	}
+
+	/*
+	 * Strictly, we're not allowed to modify vma->vm_page_prot here,
+	 * since the mmap_sem is only held in read mode. However, we
+	 * modify only the caching bits of vma->vm_page_prot and
+	 * consider those bits protected by
+	 * the bo->mutex, as we should be the only writers.
+	 * There shouldn't really be any readers of these bits except
+	 * within vm_insert_pfn()? fork?
+	 *
+	 * TODO: Add a list of vmas to the bo, and change the
+	 * vma->vm_page_prot when the object changes caching policy, with
+	 * the correct locks held.
+	 */
+
+	if (is_iomem) {
+		vma->vm_page_prot = ttm_io_prot(bo->mem.flags,
+						vma->vm_page_prot);
+	} else {
+		ttm = bo->ttm;
+		vma->vm_page_prot = (bo->mem.flags & TTM_PL_FLAG_CACHED) ?
+		    vm_get_page_prot(vma->vm_flags) :
+		    ttm_io_prot(bo->mem.flags, vma->vm_page_prot);
+	}
+
+	/*
+	 * Speculatively prefault a number of pages. Only error on
+	 * first page.
+	 */
+
+	for (i = 0; i < TTM_BO_VM_NUM_PREFAULT; ++i) {
+
+		if (is_iomem)
+			pfn = ((bus_base + bus_offset) >> PAGE_SHIFT) +
+			    page_offset;
+		else {
+			page = ttm_tt_get_page(ttm, page_offset);
+			if (unlikely(!page && i == 0)) {
+				retval = NOPFN_OOM;
+				goto out_unlock;
+			} else if (unlikely(!page)) {
+				break;
+			}
+			pfn = page_to_pfn(page);
+		}
+
+		ret = vm_insert_pfn(vma, address, pfn);
+		if (unlikely(ret == -EBUSY || (ret != 0 && i != 0)))
+			break;
+
+		/*
+		 * Somebody beat us to this PTE or prefaulting to
+		 * an already populated PTE, or prefaulting error.
+		 */
+
+		if (unlikely((ret == -EBUSY) || (ret != 0 && i > 0)))
+			break;
+		else if (unlikely(ret != 0)) {
+			retval =
+			    (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS;
+			goto out_unlock;
+		}
+
+		address += PAGE_SIZE;
+		if (unlikely(++page_offset >= page_last))
+			break;
+	}
+
+      out_unlock:
+	mutex_unlock(&bo->mutex);
+	ttm_bo_unreserve(bo);
+	return retval;
+}
+#endif
+
+static void ttm_bo_vm_open(struct vm_area_struct *vma)
+{
+	struct ttm_buffer_object *bo =
+	    (struct ttm_buffer_object *)vma->vm_private_data;
+
+	(void)ttm_bo_reference(bo);
+}
+
+static void ttm_bo_vm_close(struct vm_area_struct *vma)
+{
+	struct ttm_buffer_object *bo =
+	    (struct ttm_buffer_object *)vma->vm_private_data;
+
+	ttm_bo_unref(&bo);
+	vma->vm_private_data = NULL;
+}
+
+static struct vm_operations_struct ttm_bo_vm_ops = {
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,25))
+	.fault = ttm_bo_vm_fault,
+#else
+	.nopfn = ttm_bo_vm_nopfn,
+#endif
+	.open = ttm_bo_vm_open,
+	.close = ttm_bo_vm_close
+};
+
+int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma,
+		struct ttm_bo_device *bdev)
+{
+	struct ttm_bo_driver *driver;
+	struct ttm_buffer_object *bo;
+	int ret;
+
+	read_lock(&bdev->vm_lock);
+	bo = ttm_bo_vm_lookup_rb(bdev, vma->vm_pgoff,
+				 (vma->vm_end - vma->vm_start) >> PAGE_SHIFT);
+	if (likely(bo != NULL))
+		ttm_bo_reference(bo);
+	read_unlock(&bdev->vm_lock);
+
+	if (unlikely(bo == NULL)) {
+		printk(KERN_ERR "Could not find buffer object to map.\n");
+		ret = -EINVAL;
+		goto out_unref;
+	}
+
+	driver = bo->bdev->driver;
+	if (unlikely(!driver->verify_access)) {
+		ret = -EPERM;
+		goto out_unref;
+	}
+	ret = driver->verify_access(bo, filp);
+	if (unlikely(ret != 0))
+		goto out_unref;
+
+	vma->vm_ops = &ttm_bo_vm_ops;
+
+	/*
+	 * Note: We're transferring the bo reference to
+	 * vma->vm_private_data here.
+	 */
+
+	vma->vm_private_data = bo;
+	vma->vm_flags |= VM_RESERVED | VM_IO | VM_PFNMAP | VM_DONTEXPAND;
+	return 0;
+      out_unref:
+	ttm_bo_unref(&bo);
+	return ret;
+}
+
+int ttm_fbdev_mmap(struct vm_area_struct *vma, struct ttm_buffer_object *bo)
+{
+	if (vma->vm_pgoff != 0)
+		return -EACCES;
+
+	vma->vm_ops = &ttm_bo_vm_ops;
+	vma->vm_private_data = ttm_bo_reference(bo);
+	vma->vm_flags |= VM_RESERVED | VM_IO | VM_PFNMAP | VM_DONTEXPAND;
+
+	return 0;
+}
+
+ssize_t ttm_bo_io(struct ttm_bo_device * bdev, struct file * filp,
+		  const char __user * wbuf, char __user * rbuf, size_t count,
+		  loff_t * f_pos, int write)
+{
+	struct ttm_buffer_object *bo;
+	struct ttm_bo_driver *driver;
+	struct ttm_bo_kmap_obj map;
+	unsigned long dev_offset = (*f_pos >> PAGE_SHIFT);
+	unsigned long kmap_offset;
+	unsigned long kmap_end;
+	unsigned long kmap_num;
+	size_t io_size;
+	unsigned int page_offset;
+	char *virtual;
+	int ret;
+	int no_wait = 0;
+	int dummy;
+
+	driver = bo->bdev->driver;
+	read_lock(&bdev->vm_lock);
+	bo = ttm_bo_vm_lookup_rb(bdev, dev_offset, 1);
+	if (likely(bo != NULL))
+		ttm_bo_reference(bo);
+	read_unlock(&bdev->vm_lock);
+
+	if (unlikely(bo == NULL))
+		return -EFAULT;
+
+	if (unlikely(driver->verify_access))
+		return -EPERM;
+
+	ret = driver->verify_access(bo, filp);
+	if (unlikely(ret != 0))
+		goto out_unref;
+
+	kmap_offset = dev_offset - bo->vm_node->start;
+	if (unlikely(kmap_offset) >= bo->num_pages) {
+		ret = -EFBIG;
+		goto out_unref;
+	}
+
+	page_offset = *f_pos & ~PAGE_MASK;
+	io_size = bo->num_pages - kmap_offset;
+	io_size = (io_size << PAGE_SHIFT) - page_offset;
+	if (count < io_size)
+		io_size = count;
+
+	kmap_end = (*f_pos + count - 1) >> PAGE_SHIFT;
+	kmap_num = kmap_end - kmap_offset + 1;
+
+	ret = ttm_bo_reserve(bo, 1, no_wait, 0, 0);
+
+	switch (ret) {
+	case 0:
+		break;
+	case -ERESTART:
+		ret = -EINTR;
+		goto out_unref;
+	case -EBUSY:
+		ret = -EAGAIN;
+		goto out_unref;
+	default:
+		goto out_unref;
+	}
+
+	ret = ttm_bo_kmap(bo, kmap_offset, kmap_num, &map);
+	if (unlikely(ret != 0))
+		goto out_unref;
+
+	virtual = ttm_kmap_obj_virtual(&map, &dummy);
+	virtual += page_offset;
+
+	if (write)
+		ret = copy_from_user(virtual, wbuf, io_size);
+	else
+		ret = copy_to_user(rbuf, virtual, io_size);
+
+	ttm_bo_kunmap(&map);
+	ttm_bo_unreserve(bo);
+	ttm_bo_unref(&bo);
+
+	if (unlikely(ret != 0))
+		return -EFBIG;
+
+	*f_pos += io_size;
+
+	return io_size;
+      out_unref:
+	ttm_bo_unref(&bo);
+	return ret;
+}
+
+ssize_t ttm_bo_fbdev_io(struct ttm_buffer_object * bo, const char __user * wbuf,
+			char __user * rbuf, size_t count, loff_t * f_pos,
+			int write)
+{
+	struct ttm_bo_kmap_obj map;
+	unsigned long kmap_offset;
+	unsigned long kmap_end;
+	unsigned long kmap_num;
+	size_t io_size;
+	unsigned int page_offset;
+	char *virtual;
+	int ret;
+	int no_wait = 0;
+	int dummy;
+
+	kmap_offset = (*f_pos >> PAGE_SHIFT);
+	if (unlikely(kmap_offset) >= bo->num_pages)
+		return -EFBIG;
+
+	page_offset = *f_pos & ~PAGE_MASK;
+	io_size = bo->num_pages - kmap_offset;
+	io_size = (io_size << PAGE_SHIFT) - page_offset;
+	if (count < io_size)
+		io_size = count;
+
+	kmap_end = (*f_pos + count - 1) >> PAGE_SHIFT;
+	kmap_num = kmap_end - kmap_offset + 1;
+
+	ret = ttm_bo_reserve(bo, 1, no_wait, 0, 0);
+
+	switch (ret) {
+	case 0:
+		break;
+	case -ERESTART:
+		return -EINTR;
+	case -EBUSY:
+		return -EAGAIN;
+	default:
+		return ret;
+	}
+
+	ret = ttm_bo_kmap(bo, kmap_offset, kmap_num, &map);
+	if (unlikely(ret != 0))
+		return ret;
+
+	virtual = ttm_kmap_obj_virtual(&map, &dummy);
+	virtual += page_offset;
+
+	if (write)
+		ret = copy_from_user(virtual, wbuf, io_size);
+	else
+		ret = copy_to_user(rbuf, virtual, io_size);
+
+	ttm_bo_kunmap(&map);
+	ttm_bo_unreserve(bo);
+	ttm_bo_unref(&bo);
+
+	if (unlikely(ret != 0))
+		return ret;
+
+	*f_pos += io_size;
+
+	return io_size;
+}

linux-core/ttm/ttm_execbuf_util.c

@@ -0,0 +1,115 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2006-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
+ * All Rights Reserved.
+ * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+#include "ttm/ttm_execbuf_util.h"
+#include "ttm/ttm_bo_driver.h"
+#include "ttm/ttm_placement_common.h"
+#include <linux/wait.h>
+#include <linux/sched.h>
+
+void ttm_eu_backoff_reservation(struct list_head *list)
+{
+	struct ttm_validate_buffer *entry;
+
+	list_for_each_entry(entry, list, head) {
+		struct ttm_buffer_object *bo = entry->bo;
+		if (!entry->reserved)
+			continue;
+
+		entry->reserved = 0;
+		ttm_bo_unreserve(bo);
+	}
+}
+
+/*
+ * Reserve buffers for validation.
+ *
+ * If a buffer in the list is marked for CPU access, we back off and
+ * wait for that buffer to become free for GPU access.
+ *
+ * If a buffer is reserved for another validation, the validator with
+ * the highest validation sequence backs off and waits for that buffer
+ * to become unreserved. This prevents deadlocks when validating multiple
+ * buffers in different orders.
+ */
+
+int ttm_eu_reserve_buffers(struct list_head *list, uint32_t val_seq)
+{
+	struct ttm_validate_buffer *entry;
+	int ret;
+
+      retry:
+	list_for_each_entry(entry, list, head) {
+		struct ttm_buffer_object *bo = entry->bo;
+
+		entry->reserved = 0;
+		ret = ttm_bo_reserve(bo, 1, 0, 1, val_seq);
+		if (ret != 0) {
+			ttm_eu_backoff_reservation(list);
+			if (ret == -EAGAIN) {
+				ret = ttm_bo_wait_unreserved(bo, 1);
+				if (unlikely(ret != 0))
+					return ret;
+				goto retry;
+			} else
+				return ret;
+		}
+
+		entry->reserved = 1;
+		if (unlikely(atomic_read(&bo->cpu_writers) > 0)) {
+			ttm_eu_backoff_reservation(list);
+			ret = ttm_bo_wait_cpu(bo, 0);
+			if (ret)
+				return ret;
+			goto retry;
+		}
+	}
+	return 0;
+}
+
+void ttm_eu_fence_buffer_objects(struct list_head *list, void *sync_obj)
+{
+	struct ttm_validate_buffer *entry;
+
+	list_for_each_entry(entry, list, head) {
+		struct ttm_buffer_object *bo = entry->bo;
+		struct ttm_bo_driver *driver = bo->bdev->driver;
+		void *old_sync_obj;
+
+		mutex_lock(&bo->mutex);
+		old_sync_obj = bo->sync_obj;
+		bo->sync_obj = driver->sync_obj_ref(sync_obj);
+		bo->sync_obj_arg = entry->new_sync_obj_arg;
+		mutex_unlock(&bo->mutex);
+		ttm_bo_unreserve(bo);
+		entry->reserved = 0;
+		if (old_sync_obj)
+			driver->sync_obj_unref(&old_sync_obj);
+	}
+}

linux-core/ttm/ttm_execbuf_util.h

@@ -0,0 +1,110 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2006-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
+ * All Rights Reserved.
+ * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
+ */
+
+#ifndef _TTM_EXECBUF_UTIL_H_
+#define _TTM_EXECBUF_UTIL_H_
+
+#include "ttm/ttm_bo_api.h"
+#include "ttm/ttm_fence_api.h"
+#include <linux/list.h>
+
+/**
+ * struct ttm_validate_buffer
+ *
+ * @head:           list head for thread-private list.
+ * @bo:             refcounted buffer object pointer.
+ * @new_sync_obj_arg: New sync_obj_arg for @bo, to be used once
+ * adding a new sync object.
+ * @reservied:      Indicates whether @bo has been reserved for validation.
+ */
+
+struct ttm_validate_buffer {
+	struct list_head head;
+	struct ttm_buffer_object *bo;
+	void *new_sync_obj_arg;
+	int reserved;
+};
+
+/**
+ * function ttm_eu_backoff_reservation
+ *
+ * @list:     thread private list of ttm_validate_buffer structs.
+ *
+ * Undoes all buffer validation reservations for bos pointed to by
+ * the list entries.
+ */
+
+extern void ttm_eu_backoff_reservation(struct list_head *list);
+
+/**
+ * function ttm_eu_reserve_buffers
+ *
+ * @list:    thread private list of ttm_validate_buffer structs.
+ * @val_seq: A unique sequence number.
+ *
+ * Tries to reserve bos pointed to by the list entries for validation.
+ * If the function returns 0, all buffers are marked as "unfenced",
+ * taken off the lru lists and are not synced for write CPU usage.
+ *
+ * If the function detects a deadlock due to multiple threads trying to
+ * reserve the same buffers in reverse order, all threads except one will
+ * back off and retry. This function may sleep while waiting for
+ * CPU write reservations to be cleared, and for other threads to
+ * unreserve their buffers.
+ *
+ * This function may return -ERESTART or -EAGAIN if the calling process
+ * receives a signal while waiting. In that case, no buffers on the list
+ * will be reserved upon return.
+ *
+ * Buffers reserved by this function should be unreserved by
+ * a call to either ttm_eu_backoff_reservation() or
+ * ttm_eu_fence_buffer_objects() when command submission is complete or
+ * has failed.
+ */
+
+extern int ttm_eu_reserve_buffers(struct list_head *list, uint32_t val_seq);
+
+/**
+ * function ttm_eu_fence_buffer_objects.
+ *
+ * @list:        thread private list of ttm_validate_buffer structs.
+ * @sync_obj:    The new sync object for the buffers.
+ *
+ * This function should be called when command submission is complete, and
+ * it will add a new sync object to bos pointed to by entries on @list.
+ * It also unreserves all buffers, putting them on lru lists.
+ *
+ */
+
+extern void ttm_eu_fence_buffer_objects(struct list_head *list, void *sync_obj);
+
+#endif

linux-core/ttm/ttm_fence.c

@@ -0,0 +1,607 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2006-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
+ * All Rights Reserved.
+ * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
+ */
+
+#include "ttm/ttm_fence_api.h"
+#include "ttm/ttm_fence_driver.h"
+#include <linux/wait.h>
+#include <linux/sched.h>
+
+#include "drmP.h"
+
+/*
+ * Simple implementation for now.
+ */
+
+static void ttm_fence_lockup(struct ttm_fence_object *fence, uint32_t mask)
+{
+	struct ttm_fence_class_manager *fc = ttm_fence_fc(fence);
+
+	printk(KERN_ERR "GPU lockup dectected on engine %u "
+	       "fence type 0x%08x\n",
+	       (unsigned int)fence->fence_class, (unsigned int)mask);
+	/*
+	 * Give engines some time to idle?
+	 */
+
+	write_lock(&fc->lock);
+	ttm_fence_handler(fence->fdev, fence->fence_class,
+			  fence->sequence, mask, -EBUSY);
+	write_unlock(&fc->lock);
+}
+
+/*
+ * Convenience function to be called by fence::wait methods that
+ * need polling.
+ */
+
+int ttm_fence_wait_polling(struct ttm_fence_object *fence, int lazy,
+			   int interruptible, uint32_t mask)
+{
+	struct ttm_fence_class_manager *fc = ttm_fence_fc(fence);
+	const struct ttm_fence_driver *driver = ttm_fence_driver(fence);
+	uint32_t count = 0;
+	int ret;
+	unsigned long end_jiffies = fence->timeout_jiffies;
+
+	DECLARE_WAITQUEUE(entry, current);
+	add_wait_queue(&fc->fence_queue, &entry);
+
+	ret = 0;
+
+	for (;;) {
+		__set_current_state((interruptible) ?
+				    TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE);
+		if (ttm_fence_object_signaled(fence, mask))
+			break;
+		if (time_after_eq(jiffies, end_jiffies)) {
+			if (driver->lockup)
+				driver->lockup(fence, mask);
+			else
+				ttm_fence_lockup(fence, mask);
+			continue;
+		}
+		if (lazy)
+			schedule_timeout(1);
+		else if ((++count & 0x0F) == 0) {
+			__set_current_state(TASK_RUNNING);
+			schedule();
+			__set_current_state((interruptible) ?
+					    TASK_INTERRUPTIBLE :
+					    TASK_UNINTERRUPTIBLE);
+		}
+		if (interruptible && signal_pending(current)) {
+			ret = -ERESTART;
+			break;
+		}
+	}
+	__set_current_state(TASK_RUNNING);
+	remove_wait_queue(&fc->fence_queue, &entry);
+	return ret;
+}
+
+/*
+ * Typically called by the IRQ handler.
+ */
+
+void ttm_fence_handler(struct ttm_fence_device *fdev, uint32_t fence_class,
+		       uint32_t sequence, uint32_t type, uint32_t error)
+{
+	int wake = 0;
+	uint32_t diff;
+	uint32_t relevant_type;
+	uint32_t new_type;
+	struct ttm_fence_class_manager *fc = &fdev->fence_class[fence_class];
+	const struct ttm_fence_driver *driver = ttm_fence_driver_from_dev(fdev);
+	struct list_head *head;
+	struct ttm_fence_object *fence, *next;
+	int found = 0;
+
+	if (list_empty(&fc->ring))
+		return;
+
+	list_for_each_entry(fence, &fc->ring, ring) {
+		diff = (sequence - fence->sequence) & fc->sequence_mask;
+		if (diff > fc->wrap_diff) {
+			found = 1;
+			break;
+		}
+	}
+
+	fc->waiting_types &= ~type;
+	head = (found) ? &fence->ring : &fc->ring;
+
+	list_for_each_entry_safe_reverse(fence, next, head, ring) {
+		if (&fence->ring == &fc->ring)
+			break;
+
+		DRM_DEBUG("Fence 0x%08lx, sequence 0x%08x, type 0x%08x\n",
+			  (unsigned long)fence, fence->sequence,
+			  fence->fence_type);
+
+		if (error) {
+			fence->info.error = error;
+			fence->info.signaled_types = fence->fence_type;
+			list_del_init(&fence->ring);
+			wake = 1;
+			break;
+		}
+
+		relevant_type = type & fence->fence_type;
+		new_type = (fence->info.signaled_types | relevant_type) ^
+		    fence->info.signaled_types;
+
+		if (new_type) {
+			fence->info.signaled_types |= new_type;
+			DRM_DEBUG("Fence 0x%08lx signaled 0x%08x\n",
+				  (unsigned long)fence,
+				  fence->info.signaled_types);
+
+			if (unlikely(driver->signaled))
+				driver->signaled(fence);
+
+			if (driver->needed_flush)
+				fc->pending_flush |=
+				    driver->needed_flush(fence);
+
+			if (new_type & fence->waiting_types)
+				wake = 1;
+		}
+
+		fc->waiting_types |=
+		    fence->waiting_types & ~fence->info.signaled_types;
+
+		if (!(fence->fence_type & ~fence->info.signaled_types)) {
+			DRM_DEBUG("Fence completely signaled 0x%08lx\n",
+				  (unsigned long)fence);
+			list_del_init(&fence->ring);
+		}
+	}
+
+	/*
+	 * Reinstate lost waiting types.
+	 */
+
+	if ((fc->waiting_types & type) != type) {
+		head = head->prev;
+		list_for_each_entry(fence, head, ring) {
+			if (&fence->ring == &fc->ring)
+				break;
+			diff =
+			    (fc->highest_waiting_sequence -
+			     fence->sequence) & fc->sequence_mask;
+			if (diff > fc->wrap_diff)
+				break;
+
+			fc->waiting_types |=
+			    fence->waiting_types & ~fence->info.signaled_types;
+		}
+	}
+
+	if (wake)
+		wake_up_all(&fc->fence_queue);
+}
+
+static void ttm_fence_unring(struct ttm_fence_object *fence)
+{
+	struct ttm_fence_class_manager *fc = ttm_fence_fc(fence);
+	unsigned long irq_flags;
+
+	write_lock_irqsave(&fc->lock, irq_flags);
+	list_del_init(&fence->ring);
+	write_unlock_irqrestore(&fc->lock, irq_flags);
+}
+
+int ttm_fence_object_signaled(struct ttm_fence_object *fence, uint32_t mask)
+{
+	unsigned long flags;
+	int signaled;
+	const struct ttm_fence_driver *driver = ttm_fence_driver(fence);
+	struct ttm_fence_class_manager *fc = ttm_fence_fc(fence);
+
+	mask &= fence->fence_type;
+	read_lock_irqsave(&fc->lock, flags);
+	signaled = (mask & fence->info.signaled_types) == mask;
+	read_unlock_irqrestore(&fc->lock, flags);
+	if (!signaled && driver->poll) {
+		write_lock_irqsave(&fc->lock, flags);
+		driver->poll(fence->fdev, fence->fence_class, mask);
+		signaled = (mask & fence->info.signaled_types) == mask;
+		write_unlock_irqrestore(&fc->lock, flags);
+	}
+	return signaled;
+}
+
+int ttm_fence_object_flush(struct ttm_fence_object *fence, uint32_t type)
+{
+	const struct ttm_fence_driver *driver = ttm_fence_driver(fence);
+	struct ttm_fence_class_manager *fc = ttm_fence_fc(fence);
+	unsigned long irq_flags;
+	uint32_t saved_pending_flush;
+	uint32_t diff;
+	int call_flush;
+
+	if (type & ~fence->fence_type) {
+		DRM_ERROR("Flush trying to extend fence type, "
+			  "0x%x, 0x%x\n", type, fence->fence_type);
+		return -EINVAL;
+	}
+
+	write_lock_irqsave(&fc->lock, irq_flags);
+	fence->waiting_types |= type;
+	fc->waiting_types |= fence->waiting_types;
+	diff = (fence->sequence - fc->highest_waiting_sequence) &
+	    fc->sequence_mask;
+
+	if (diff < fc->wrap_diff)
+		fc->highest_waiting_sequence = fence->sequence;
+
+	/*
+	 * fence->waiting_types has changed. Determine whether
+	 * we need to initiate some kind of flush as a result of this.
+	 */
+
+	saved_pending_flush = fc->pending_flush;
+	if (driver->needed_flush)
+		fc->pending_flush |= driver->needed_flush(fence);
+
+	if (driver->poll)
+		driver->poll(fence->fdev, fence->fence_class,
+			     fence->waiting_types);
+
+	call_flush = fc->pending_flush;
+	write_unlock_irqrestore(&fc->lock, irq_flags);
+
+	if (call_flush && driver->flush)
+		driver->flush(fence->fdev, fence->fence_class);
+
+	return 0;
+}
+
+/*
+ * Make sure old fence objects are signaled before their fence sequences are
+ * wrapped around and reused.
+ */
+
+void ttm_fence_flush_old(struct ttm_fence_device *fdev,
+			 uint32_t fence_class, uint32_t sequence)
+{
+	struct ttm_fence_class_manager *fc = &fdev->fence_class[fence_class];
+	struct ttm_fence_object *fence;
+	unsigned long irq_flags;
+	const struct ttm_fence_driver *driver = fdev->driver;
+	int call_flush;
+
+	uint32_t diff;
+
+	write_lock_irqsave(&fc->lock, irq_flags);
+
+	list_for_each_entry_reverse(fence, &fc->ring, ring) {
+		diff = (sequence - fence->sequence) & fc->sequence_mask;
+		if (diff <= fc->flush_diff)
+			break;
+
+		fence->waiting_types = fence->fence_type;
+		fc->waiting_types |= fence->fence_type;
+
+		if (driver->needed_flush)
+			fc->pending_flush |= driver->needed_flush(fence);
+	}
+
+	if (driver->poll)
+		driver->poll(fdev, fence_class, fc->waiting_types);
+
+	call_flush = fc->pending_flush;
+	write_unlock_irqrestore(&fc->lock, irq_flags);
+
+	if (call_flush && driver->flush)
+		driver->flush(fdev, fence->fence_class);
+
+	/*
+	 * FIXME: Shold we implement a wait here for really old fences?
+	 */
+
+}
+
+int ttm_fence_object_wait(struct ttm_fence_object *fence,
+			  int lazy, int interruptible, uint32_t mask)
+{
+	const struct ttm_fence_driver *driver = ttm_fence_driver(fence);
+	struct ttm_fence_class_manager *fc = ttm_fence_fc(fence);
+	int ret = 0;
+	unsigned long timeout;
+	unsigned long cur_jiffies;
+	unsigned long to_jiffies;
+
+	if (mask & ~fence->fence_type) {
+		DRM_ERROR("Wait trying to extend fence type"
+			  " 0x%08x 0x%08x\n", mask, fence->fence_type);
+		BUG();
+		return -EINVAL;
+	}
+
+	if (driver->wait)
+		return driver->wait(fence, lazy, interruptible, mask);
+
+	ttm_fence_object_flush(fence, mask);
+      retry:
+	if (!driver->has_irq ||
+	    driver->has_irq(fence->fdev, fence->fence_class, mask)) {
+
+		cur_jiffies = jiffies;
+		to_jiffies = fence->timeout_jiffies;
+
+		timeout = (time_after(to_jiffies, cur_jiffies)) ?
+		    to_jiffies - cur_jiffies : 1;
+
+		if (interruptible)
+			ret = wait_event_interruptible_timeout
+			    (fc->fence_queue,
+			     ttm_fence_object_signaled(fence, mask), timeout);
+		else
+			ret = wait_event_timeout
+			    (fc->fence_queue,
+			     ttm_fence_object_signaled(fence, mask), timeout);
+
+		if (unlikely(ret == -ERESTARTSYS))
+			return -ERESTART;
+
+		if (unlikely(ret == 0)) {
+			if (driver->lockup)
+				driver->lockup(fence, mask);
+			else
+				ttm_fence_lockup(fence, mask);
+			goto retry;
+		}
+
+		return 0;
+	}
+
+	return ttm_fence_wait_polling(fence, lazy, interruptible, mask);
+}
+
+int ttm_fence_object_emit(struct ttm_fence_object *fence, uint32_t fence_flags,
+			  uint32_t fence_class, uint32_t type)
+{
+	const struct ttm_fence_driver *driver = ttm_fence_driver(fence);
+	struct ttm_fence_class_manager *fc = ttm_fence_fc(fence);
+	unsigned long flags;
+	uint32_t sequence;
+	unsigned long timeout;
+	int ret;
+
+	ttm_fence_unring(fence);
+	ret = driver->emit(fence->fdev,
+			   fence_class, fence_flags, &sequence, &timeout);
+	if (ret)
+		return ret;
+
+	write_lock_irqsave(&fc->lock, flags);
+	fence->fence_class = fence_class;
+	fence->fence_type = type;
+	fence->waiting_types = 0;
+	fence->info.signaled_types = 0;
+	fence->info.error = 0;
+	fence->sequence = sequence;
+	fence->timeout_jiffies = timeout;
+	if (list_empty(&fc->ring))
+		fc->highest_waiting_sequence = sequence - 1;
+	list_add_tail(&fence->ring, &fc->ring);
+	fc->latest_queued_sequence = sequence;
+	write_unlock_irqrestore(&fc->lock, flags);
+	return 0;
+}
+
+int ttm_fence_object_init(struct ttm_fence_device *fdev,
+			  uint32_t fence_class,
+			  uint32_t type,
+			  uint32_t create_flags,
+			  void (*destroy) (struct ttm_fence_object *),
+			  struct ttm_fence_object *fence)
+{
+	int ret = 0;
+
+	kref_init(&fence->kref);
+	fence->fence_class = fence_class;
+	fence->fence_type = type;
+	fence->info.signaled_types = 0;
+	fence->waiting_types = 0;
+	fence->sequence = 0;
+	fence->info.error = 0;
+	fence->fdev = fdev;
+	fence->destroy = destroy;
+	INIT_LIST_HEAD(&fence->ring);
+	atomic_inc(&fdev->count);
+
+	if (create_flags & TTM_FENCE_FLAG_EMIT) {
+		ret = ttm_fence_object_emit(fence, create_flags,
+					    fence->fence_class, type);
+	}
+
+	return ret;
+}
+
+int ttm_fence_object_create(struct ttm_fence_device *fdev,
+			    uint32_t fence_class,
+			    uint32_t type,
+			    uint32_t create_flags,
+			    struct ttm_fence_object **c_fence)
+{
+	struct ttm_fence_object *fence;
+	int ret;
+
+	ret = ttm_mem_global_alloc(fdev->mem_glob, sizeof(*fence), 0, 0, 0);
+	if (unlikely(ret != 0)) {
+		printk(KERN_ERR "Out of memory creating fence object\n");
+		return ret;
+	}
+
+	fence = kmalloc(sizeof(*fence), GFP_KERNEL);
+	if (!fence) {
+		printk(KERN_ERR "Out of memory creating fence object\n");
+		ttm_mem_global_free(fdev->mem_glob, sizeof(*fence), 0);
+		return -ENOMEM;
+	}
+
+	ret = ttm_fence_object_init(fdev, fence_class, type,
+				    create_flags, NULL, fence);
+	if (ret) {
+		ttm_fence_object_unref(&fence);
+		return ret;
+	}
+	*c_fence = fence;
+
+	return 0;
+}
+
+static void ttm_fence_object_destroy(struct kref *kref)
+{
+	struct ttm_fence_object *fence =
+	    container_of(kref, struct ttm_fence_object, kref);
+	struct ttm_fence_class_manager *fc = ttm_fence_fc(fence);
+	unsigned long irq_flags;
+
+	write_lock_irqsave(&fc->lock, irq_flags);
+	list_del_init(&fence->ring);
+	write_unlock_irqrestore(&fc->lock, irq_flags);
+
+	atomic_dec(&fence->fdev->count);
+	if (fence->destroy)
+		fence->destroy(fence);
+	else {
+		ttm_mem_global_free(fence->fdev->mem_glob, sizeof(*fence), 0);
+		kfree(fence);
+	}
+}
+
+void ttm_fence_device_release(struct ttm_fence_device *fdev)
+{
+	kfree(fdev->fence_class);
+}
+
+int
+ttm_fence_device_init(int num_classes,
+		      struct ttm_mem_global *mem_glob,
+		      struct ttm_fence_device *fdev,
+		      const struct ttm_fence_class_init *init,
+		      int replicate_init, const struct ttm_fence_driver *driver)
+{
+	struct ttm_fence_class_manager *fc;
+	const struct ttm_fence_class_init *fci;
+	int i;
+
+	fdev->mem_glob = mem_glob;
+	fdev->fence_class = kzalloc(num_classes *
+				    sizeof(*fdev->fence_class), GFP_KERNEL);
+
+	if (unlikely(!fdev->fence_class))
+		return -ENOMEM;
+
+	fdev->num_classes = num_classes;
+	atomic_set(&fdev->count, 0);
+	fdev->driver = driver;
+
+	for (i = 0; i < fdev->num_classes; ++i) {
+		fc = &fdev->fence_class[i];
+		fci = &init[(replicate_init) ? 0 : i];
+
+		fc->wrap_diff = fci->wrap_diff;
+		fc->flush_diff = fci->flush_diff;
+		fc->sequence_mask = fci->sequence_mask;
+
+		rwlock_init(&fc->lock);
+		INIT_LIST_HEAD(&fc->ring);
+		init_waitqueue_head(&fc->fence_queue);
+	}
+
+	return 0;
+}
+
+struct ttm_fence_info ttm_fence_get_info(struct ttm_fence_object *fence)
+{
+	struct ttm_fence_class_manager *fc = ttm_fence_fc(fence);
+	struct ttm_fence_info tmp;
+	unsigned long irq_flags;
+
+	read_lock_irqsave(&fc->lock, irq_flags);
+	tmp = fence->info;
+	read_unlock_irqrestore(&fc->lock, irq_flags);
+
+	return tmp;
+}
+
+void ttm_fence_object_unref(struct ttm_fence_object **p_fence)
+{
+	struct ttm_fence_object *fence = *p_fence;
+
+	*p_fence = NULL;
+	(void)kref_put(&fence->kref, &ttm_fence_object_destroy);
+}
+
+/*
+ * Placement / BO sync object glue.
+ */
+
+int ttm_fence_sync_obj_signaled(void *sync_obj, void *sync_arg)
+{
+	struct ttm_fence_object *fence = (struct ttm_fence_object *)sync_obj;
+	uint32_t fence_types = (uint32_t) (unsigned long)sync_arg;
+
+	return ttm_fence_object_signaled(fence, fence_types);
+}
+
+int ttm_fence_sync_obj_wait(void *sync_obj, void *sync_arg,
+			    int lazy, int interruptible)
+{
+	struct ttm_fence_object *fence = (struct ttm_fence_object *)sync_obj;
+	uint32_t fence_types = (uint32_t) (unsigned long)sync_arg;
+
+	return ttm_fence_object_wait(fence, lazy, interruptible, fence_types);
+}
+
+int ttm_fence_sync_obj_flush(void *sync_obj, void *sync_arg)
+{
+	struct ttm_fence_object *fence = (struct ttm_fence_object *)sync_obj;
+	uint32_t fence_types = (uint32_t) (unsigned long)sync_arg;
+
+	return ttm_fence_object_flush(fence, fence_types);
+}
+
+void ttm_fence_sync_obj_unref(void **sync_obj)
+{
+	ttm_fence_object_unref((struct ttm_fence_object **)sync_obj);
+}
+
+void *ttm_fence_sync_obj_ref(void *sync_obj)
+{
+	return (void *)
+	    ttm_fence_object_ref((struct ttm_fence_object *)sync_obj);
+}

linux-core/ttm/ttm_fence_api.h

@@ -0,0 +1,277 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2006-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
+ * All Rights Reserved.
+ * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
+ */
+#ifndef _TTM_FENCE_API_H_
+#define _TTM_FENCE_API_H_
+
+#include <linux/list.h>
+#include <linux/kref.h>
+
+#define TTM_FENCE_FLAG_EMIT (1 << 0)
+#define TTM_FENCE_TYPE_EXE  (1 << 0)
+
+struct ttm_fence_device;
+
+/**
+ * struct ttm_fence_info
+ *
+ * @fence_class:    The fence class.
+ * @fence_type:     Bitfield indicating types for this fence.
+ * @signaled_types: Bitfield indicating which types are signaled.
+ * @error:          Last error reported from the device.
+ *
+ * Used as output from the ttm_fence_get_info
+ */
+
+struct ttm_fence_info {
+	uint32_t signaled_types;
+	uint32_t error;
+};
+
+/**
+ * struct ttm_fence_object
+ *
+ * @fdev:            Pointer to the fence device struct.
+ * @kref:            Holds the reference count of this fence object.
+ * @ring:            List head used for the circular list of not-completely
+ *                   signaled fences.
+ * @info:            Data for fast retrieval using the ttm_fence_get_info()
+ * function.
+ * @timeout_jiffies: Absolute jiffies value indicating when this fence
+ *                   object times out and, if waited on, calls ttm_fence_lockup
+ *                   to check for and resolve a GPU lockup.
+ * @sequence:        Fence sequence number.
+ * @waiting_types:   Types currently waited on.
+ * @destroy:         Called to free the fence object, when its refcount has
+ *                   reached zero. If NULL, kfree is used.
+ *
+ * This struct is provided in the driver interface so that drivers can
+ * derive from it and create their own fence implementation. All members
+ * are private to the fence implementation and the fence driver callbacks.
+ * Otherwise a driver may access the derived object using container_of().
+ */
+
+struct ttm_fence_object {
+	struct ttm_fence_device *fdev;
+	struct kref kref;
+	uint32_t fence_class;
+	uint32_t fence_type;
+
+	/*
+	 * The below fields are protected by the fence class
+	 * manager spinlock.
+	 */
+
+	struct list_head ring;
+	struct ttm_fence_info info;
+	unsigned long timeout_jiffies;
+	uint32_t sequence;
+	uint32_t waiting_types;
+	void (*destroy) (struct ttm_fence_object *);
+};
+
+/**
+ * ttm_fence_object_init
+ *
+ * @fdev: Pointer to a struct ttm_fence_device.
+ * @fence_class: Fence class for this fence.
+ * @type: Fence type for this fence.
+ * @create_flags: Flags indicating varios actions at init time. At this point
+ * there's only TTM_FENCE_FLAG_EMIT, which triggers a sequence emission to
+ * the command stream.
+ * @destroy: Destroy function. If NULL, kfree() is used.
+ * @fence: The struct ttm_fence_object to initialize.
+ *
+ * Initialize a pre-allocated fence object. This function, together with the
+ * destroy function makes it possible to derive driver-specific fence objects.
+ */
+
+extern int
+ttm_fence_object_init(struct ttm_fence_device *fdev,
+		      uint32_t fence_class,
+		      uint32_t type,
+		      uint32_t create_flags,
+		      void (*destroy) (struct ttm_fence_object * fence),
+		      struct ttm_fence_object *fence);
+
+/**
+ * ttm_fence_object_create
+ *
+ * @fdev: Pointer to a struct ttm_fence_device.
+ * @fence_class: Fence class for this fence.
+ * @type: Fence type for this fence.
+ * @create_flags: Flags indicating varios actions at init time. At this point
+ * there's only TTM_FENCE_FLAG_EMIT, which triggers a sequence emission to
+ * the command stream.
+ * @c_fence: On successful termination, *(@c_fence) will point to the created
+ * fence object.
+ *
+ * Create and initialize a struct ttm_fence_object. The destroy function will
+ * be set to kfree().
+ */
+
+extern int
+ttm_fence_object_create(struct ttm_fence_device *fdev,
+			uint32_t fence_class,
+			uint32_t type,
+			uint32_t create_flags,
+			struct ttm_fence_object **c_fence);
+
+/**
+ * ttm_fence_object_wait
+ *
+ * @fence: The fence object to wait on.
+ * @lazy: Allow sleeps to reduce the cpu-usage if polling.
+ * @interruptible: Sleep interruptible when waiting.
+ * @type_mask: Wait for the given type_mask to signal.
+ *
+ * Wait for a fence to signal the given type_mask. The function will
+ * perform a fence_flush using type_mask. (See ttm_fence_object_flush).
+ *
+ * Returns
+ * -ERESTART if interrupted by a signal.
+ * May return driver-specific error codes if timed-out.
+ */
+
+extern int
+ttm_fence_object_wait(struct ttm_fence_object *fence,
+		      int lazy, int interruptible, uint32_t type_mask);
+
+/**
+ * ttm_fence_object_flush
+ *
+ * @fence: The fence object to flush.
+ * @flush_mask: Fence types to flush.
+ *
+ * Make sure that the given fence eventually signals the
+ * types indicated by @flush_mask. Note that this may or may not
+ * map to a CPU or GPU flush.
+ */
+
+extern int
+ttm_fence_object_flush(struct ttm_fence_object *fence, uint32_t flush_mask);
+
+/**
+ * ttm_fence_get_info
+ *
+ * @fence: The fence object.
+ *
+ * Copy the info block from the fence while holding relevant locks.
+ */
+
+struct ttm_fence_info ttm_fence_get_info(struct ttm_fence_object *fence);
+
+/**
+ * ttm_fence_object_ref
+ *
+ * @fence: The fence object.
+ *
+ * Return a ref-counted pointer to the fence object indicated by @fence.
+ */
+
+static inline struct ttm_fence_object *ttm_fence_object_ref(struct
+							    ttm_fence_object
+							    *fence)
+{
+	kref_get(&fence->kref);
+	return fence;
+}
+
+/**
+ * ttm_fence_object_unref
+ *
+ * @p_fence: Pointer to a ref-counted pinter to a struct ttm_fence_object.
+ *
+ * Unreference the fence object pointed to by *(@p_fence), clearing
+ * *(p_fence).
+ */
+
+extern void ttm_fence_object_unref(struct ttm_fence_object **p_fence);
+
+/**
+ * ttm_fence_object_signaled
+ *
+ * @fence: Pointer to the struct ttm_fence_object.
+ * @mask: Type mask to check whether signaled.
+ *
+ * This function checks (without waiting) whether the fence object
+ * pointed to by @fence has signaled the types indicated by @mask,
+ * and returns 1 if true, 0 if false. This function does NOT perform
+ * an implicit fence flush.
+ */
+
+extern int
+ttm_fence_object_signaled(struct ttm_fence_object *fence, uint32_t mask);
+
+/**
+ * ttm_fence_class
+ *
+ * @fence: Pointer to the struct ttm_fence_object.
+ *
+ * Convenience function that returns the fence class of a struct ttm_fence_object.
+ */
+
+static inline uint32_t ttm_fence_class(const struct ttm_fence_object *fence)
+{
+	return fence->fence_class;
+}
+
+/**
+ * ttm_fence_types
+ *
+ * @fence: Pointer to the struct ttm_fence_object.
+ *
+ * Convenience function that returns the fence types of a struct ttm_fence_object.
+ */
+
+static inline uint32_t ttm_fence_types(const struct ttm_fence_object *fence)
+{
+	return fence->fence_type;
+}
+
+/*
+ * The functions below are wrappers to the above functions, with
+ * similar names but with sync_obj omitted. These wrappers are intended
+ * to be plugged directly into the buffer object driver's sync object
+ * API, if the driver chooses to use ttm_fence_objects as buffer object
+ * sync objects. In the prototypes below, a sync_obj is cast to a
+ * struct ttm_fence_object, whereas a sync_arg is cast to an uint32_t representing
+ * a fence_type argument.
+ */
+
+extern int ttm_fence_sync_obj_signaled(void *sync_obj, void *sync_arg);
+extern int ttm_fence_sync_obj_wait(void *sync_obj, void *sync_arg,
+				   int lazy, int interruptible);
+extern int ttm_fence_sync_obj_flush(void *sync_obj, void *sync_arg);
+extern void ttm_fence_sync_obj_unref(void **sync_obj);
+extern void *ttm_fence_sync_obj_ref(void *sync_obj);
+
+#endif

linux-core/ttm/ttm_fence_driver.h

@@ -0,0 +1,309 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2006-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
+ * All Rights Reserved.
+ * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
+ */
+#ifndef _TTM_FENCE_DRIVER_H_
+#define _TTM_FENCE_DRIVER_H_
+
+#include <linux/kref.h>
+#include <linux/spinlock.h>
+#include <linux/wait.h>
+#include "ttm_fence_api.h"
+#include "ttm_memory.h"
+
+/** @file ttm_fence_driver.h
+ *
+ * Definitions needed for a driver implementing the
+ * ttm_fence subsystem.
+ */
+
+/**
+ * struct ttm_fence_class_manager:
+ *
+ * @wrap_diff: Sequence difference to catch 32-bit wrapping.
+ * if (seqa - seqb) > @wrap_diff, then seqa < seqb.
+ * @flush_diff: Sequence difference to trigger fence flush.
+ * if (cur_seq - seqa) > @flush_diff, then consider fence object with
+ * seqa as old an needing a flush.
+ * @sequence_mask: Mask of valid bits in a fence sequence.
+ * @lock: Lock protecting this struct as well as fence objects
+ * associated with this struct.
+ * @ring: Circular sequence-ordered list of fence objects.
+ * @pending_flush: Fence types currently needing a flush.
+ * @waiting_types: Fence types that are currently waited for.
+ * @fence_queue: Queue of waiters on fences belonging to this fence class.
+ * @highest_waiting_sequence: Sequence number of the fence with highest sequence
+ * number and that is waited for.
+ * @latest_queued_sequence: Sequence number of the fence latest queued on the ring.
+ */
+
+struct ttm_fence_class_manager {
+
+	/*
+	 * Unprotected constant members.
+	 */
+
+	uint32_t wrap_diff;
+	uint32_t flush_diff;
+	uint32_t sequence_mask;
+
+	/*
+	 * The rwlock protects this structure as well as
+	 * the data in all fence objects belonging to this
+	 * class. This should be OK as most fence objects are
+	 * only read from once they're created.
+	 */
+
+	rwlock_t lock;
+	struct list_head ring;
+	uint32_t pending_flush;
+	uint32_t waiting_types;
+	wait_queue_head_t fence_queue;
+	uint32_t highest_waiting_sequence;
+	uint32_t latest_queued_sequence;
+};
+
+/**
+ * struct ttm_fence_device
+ *
+ * @fence_class:  Array of fence class managers.
+ * @num_classes:  Array dimension of @fence_class.
+ * @count:        Current number of fence objects for statistics.
+ * @driver:       Driver struct.
+ *
+ * Provided in the driver interface so that the driver can derive
+ * from this struct for its driver_private, and accordingly
+ * access the driver_private from the fence driver callbacks.
+ *
+ * All members except "count" are initialized at creation and
+ * never touched after that. No protection needed.
+ *
+ * This struct is private to the fence implementation and to the fence
+ * driver callbacks, and may otherwise be used by drivers only to
+ * obtain the derived device_private object using container_of().
+ */
+
+struct ttm_fence_device {
+	struct ttm_mem_global *mem_glob;
+	struct ttm_fence_class_manager *fence_class;
+	uint32_t num_classes;
+	atomic_t count;
+	const struct ttm_fence_driver *driver;
+};
+
+/**
+ * struct ttm_fence_class_init
+ *
+ * @wrap_diff:    Fence sequence number wrap indicator. If
+ * (sequence1 - sequence2) > @wrap_diff, then sequence1 is
+ * considered to be older than sequence2.
+ * @flush_diff:   Fence sequence number flush indicator.
+ * If a non-completely-signaled fence has a fence sequence number
+ * sequence1 and (sequence1 - current_emit_sequence) > @flush_diff,
+ * the fence is considered too old and it will be flushed upon the
+ * next call of ttm_fence_flush_old(), to make sure no fences with
+ * stale sequence numbers remains unsignaled. @flush_diff should
+ * be sufficiently less than @wrap_diff.
+ * @sequence_mask: Mask with valid bits of the fence sequence
+ * number set to 1.
+ *
+ * This struct is used as input to ttm_fence_device_init.
+ */
+
+struct ttm_fence_class_init {
+	uint32_t wrap_diff;
+	uint32_t flush_diff;
+	uint32_t sequence_mask;
+};
+
+/**
+ * struct ttm_fence_driver
+ *
+ * @has_irq: Called by a potential waiter. Should return 1 if a
+ * fence object with indicated parameters is expected to signal
+ * automatically, and 0 if the fence implementation needs to
+ * repeatedly call @poll to make it signal.
+ * @emit:    Make sure a fence with the given parameters is
+ * present in the indicated command stream. Return its sequence number
+ * in "breadcrumb".
+ * @poll:    Check and report sequences of the given "fence_class"
+ *           that have signaled "types"
+ * @flush:   Make sure that the types indicated by the bitfield
+ *           ttm_fence_class_manager::pending_flush will eventually
+ *           signal. These bits have been put together using the
+ *           result from the needed_flush function described below.
+ * @needed_flush: Given the fence_class and fence_types indicated by
+ *           "fence", and the last received fence sequence of this
+ *           fence class, indicate what types need a fence flush to
+ *           signal. Return as a bitfield.
+ * @wait:    Set to non-NULL if the driver wants to override the fence
+ *           wait implementation. Return 0 on success, -EBUSY on failure,
+ *           and -ERESTART if interruptible and a signal is pending.
+ * @signaled:  Driver callback that is called whenever a
+ *           ttm_fence_object::signaled_types has changed status.
+ *           This function is called from atomic context,
+ *           with the ttm_fence_class_manager::lock held in write mode.
+ * @lockup:  Driver callback that is called whenever a wait has exceeded
+ *           the lifetime of a fence object.
+ *           If there is a GPU lockup,
+ *           this function should, if possible, reset the GPU,
+ *           call the ttm_fence_handler with an error status, and
+ *           return. If no lockup was detected, simply extend the
+ *           fence timeout_jiffies and return. The driver might
+ *           want to protect the lockup check with a mutex and cache a
+ *           non-locked-up status for a while to avoid an excessive
+ *           amount of lockup checks from every waiting thread.
+ */
+
+struct ttm_fence_driver {
+	int (*has_irq) (struct ttm_fence_device * fdev,
+			uint32_t fence_class, uint32_t flags);
+	int (*emit) (struct ttm_fence_device * fdev,
+		     uint32_t fence_class,
+		     uint32_t flags,
+		     uint32_t * breadcrumb, unsigned long *timeout_jiffies);
+	void (*flush) (struct ttm_fence_device * fdev, uint32_t fence_class);
+	void (*poll) (struct ttm_fence_device * fdev,
+		      uint32_t fence_class, uint32_t types);
+	 uint32_t(*needed_flush)
+	 (struct ttm_fence_object * fence);
+	int (*wait) (struct ttm_fence_object * fence, int lazy,
+		     int interruptible, uint32_t mask);
+	void (*signaled) (struct ttm_fence_object * fence);
+	void (*lockup) (struct ttm_fence_object * fence, uint32_t fence_types);
+};
+
+/**
+ * function ttm_fence_device_init
+ *
+ * @num_classes:      Number of fence classes for this fence implementation.
+ * @mem_global:       Pointer to the global memory accounting info.
+ * @fdev:             Pointer to an uninitialised struct ttm_fence_device.
+ * @init:             Array of initialization info for each fence class.
+ * @replicate_init:   Use the first @init initialization info for all classes.
+ * @driver:           Driver callbacks.
+ *
+ * Initialize a struct ttm_fence_driver structure. Returns -ENOMEM if
+ * out-of-memory. Otherwise returns 0.
+ */
+extern int
+ttm_fence_device_init(int num_classes,
+		      struct ttm_mem_global *mem_glob,
+		      struct ttm_fence_device *fdev,
+		      const struct ttm_fence_class_init *init,
+		      int replicate_init,
+		      const struct ttm_fence_driver *driver);
+
+/**
+ * function ttm_fence_device_release
+ *
+ * @fdev:             Pointer to the fence device.
+ *
+ * Release all resources held by a fence device. Note that before
+ * this function is called, the caller must have made sure all fence
+ * objects belonging to this fence device are completely signaled.
+ */
+
+extern void ttm_fence_device_release(struct ttm_fence_device *fdev);
+
+/**
+ * ttm_fence_handler - the fence handler.
+ *
+ * @fdev:        Pointer to the fence device.
+ * @fence_class: Fence class that signals.
+ * @sequence:    Signaled sequence.
+ * @type:        Types that signal.
+ * @error:       Error from the engine.
+ *
+ * This function signals all fences with a sequence previous to the
+ * @sequence argument, and belonging to @fence_class. The signaled fence
+ * types are provided in @type. If error is non-zero, the error member
+ * of the fence with sequence = @sequence is set to @error. This value
+ * may be reported back to user-space, indicating, for example an illegal
+ * 3D command or illegal mpeg data.
+ *
+ * This function is typically called from the driver::poll method when the
+ * command sequence preceding the fence marker has executed. It should be
+ * called with the ttm_fence_class_manager::lock held in write mode and
+ * may be called from interrupt context.
+ */
+
+extern void
+ttm_fence_handler(struct ttm_fence_device *fdev,
+		  uint32_t fence_class,
+		  uint32_t sequence, uint32_t type, uint32_t error);
+
+/**
+ * ttm_fence_driver_from_dev
+ *
+ * @fdev:        The ttm fence device.
+ *
+ * Returns a pointer to the fence driver struct.
+ */
+
+static inline const struct ttm_fence_driver *ttm_fence_driver_from_dev(struct
+								       ttm_fence_device
+								       *fdev)
+{
+	return fdev->driver;
+}
+
+/**
+ * ttm_fence_driver
+ *
+ * @fence:        Pointer to a ttm fence object.
+ *
+ * Returns a pointer to the fence driver struct.
+ */
+
+static inline const struct ttm_fence_driver *ttm_fence_driver(struct
+							      ttm_fence_object
+							      *fence)
+{
+	return ttm_fence_driver_from_dev(fence->fdev);
+}
+
+/**
+ * ttm_fence_fc
+ *
+ * @fence:        Pointer to a ttm fence object.
+ *
+ * Returns a pointer to the struct ttm_fence_class_manager for the
+ * fence class of @fence.
+ */
+
+static inline struct ttm_fence_class_manager *ttm_fence_fc(struct
+							   ttm_fence_object
+							   *fence)
+{
+	return &fence->fdev->fence_class[fence->fence_class];
+}
+
+#endif

linux-core/ttm/ttm_fence_user.c

@@ -0,0 +1,242 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2006-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
+ * All Rights Reserved.
+ * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
+ */
+
+#include "drmP.h"
+#include "ttm/ttm_fence_user.h"
+#include "ttm/ttm_object.h"
+#include "ttm/ttm_fence_driver.h"
+#include "ttm/ttm_userobj_api.h"
+
+/**
+ * struct ttm_fence_user_object
+ *
+ * @base:    The base object used for user-space visibility and refcounting.
+ *
+ * @fence:   The fence object itself.
+ *
+ */
+
+struct ttm_fence_user_object {
+	struct ttm_base_object base;
+	struct ttm_fence_object fence;
+};
+
+static struct ttm_fence_user_object *ttm_fence_user_object_lookup(struct
+								  ttm_object_file
+								  *tfile,
+								  uint32_t
+								  handle)
+{
+	struct ttm_base_object *base;
+
+	base = ttm_base_object_lookup(tfile, handle);
+	if (unlikely(base == NULL)) {
+		printk(KERN_ERR "Invalid fence handle 0x%08lx\n",
+		       (unsigned long)handle);
+		return NULL;
+	}
+
+	if (unlikely(base->object_type != ttm_fence_type)) {
+		ttm_base_object_unref(&base);
+		printk(KERN_ERR "Invalid fence handle 0x%08lx\n",
+		       (unsigned long)handle);
+		return NULL;
+	}
+
+	return container_of(base, struct ttm_fence_user_object, base);
+}
+
+/*
+ * The fence object destructor.
+ */
+
+static void ttm_fence_user_destroy(struct ttm_fence_object *fence)
+{
+	struct ttm_fence_user_object *ufence =
+	    container_of(fence, struct ttm_fence_user_object, fence);
+
+	ttm_mem_global_free(fence->fdev->mem_glob, sizeof(*ufence), 0);
+	kfree(ufence);
+}
+
+/*
+ * The base object destructor. We basically unly unreference the
+ * attached fence object.
+ */
+
+static void ttm_fence_user_release(struct ttm_base_object **p_base)
+{
+	struct ttm_fence_user_object *ufence;
+	struct ttm_base_object *base = *p_base;
+	struct ttm_fence_object *fence;
+
+	*p_base = NULL;
+
+	if (unlikely(base == NULL))
+		return;
+
+	ufence = container_of(base, struct ttm_fence_user_object, base);
+	fence = &ufence->fence;
+	ttm_fence_object_unref(&fence);
+}
+
+int
+ttm_fence_user_create(struct ttm_fence_device *fdev,
+		      struct ttm_object_file *tfile,
+		      uint32_t fence_class,
+		      uint32_t fence_types,
+		      uint32_t create_flags,
+		      struct ttm_fence_object **fence, uint32_t * user_handle)
+{
+	int ret;
+	struct ttm_fence_object *tmp;
+	struct ttm_fence_user_object *ufence;
+
+	ret = ttm_mem_global_alloc(fdev->mem_glob, sizeof(*ufence), 0, 0, 0);
+	if (unlikely(ret != 0))
+		return -ENOMEM;
+
+	ufence = kmalloc(sizeof(*ufence), GFP_KERNEL);
+	if (unlikely(ufence == NULL)) {
+		ttm_mem_global_free(fdev->mem_glob, sizeof(*ufence), 0);
+		return -ENOMEM;
+	}
+
+	ret = ttm_fence_object_init(fdev,
+				    fence_class,
+				    fence_types, create_flags,
+				    &ttm_fence_user_destroy, &ufence->fence);
+
+	if (unlikely(ret != 0))
+		goto out_err0;
+
+	/*
+	 * One fence ref is held by the fence ptr we return.
+	 * The other one by the base object. Need to up the
+	 * fence refcount before we publish this object to
+	 * user-space.
+	 */
+
+	tmp = ttm_fence_object_ref(&ufence->fence);
+	ret = ttm_base_object_init(tfile, &ufence->base,
+				   0, ttm_fence_type,
+				   &ttm_fence_user_release, NULL);
+
+	if (unlikely(ret != 0))
+		goto out_err1;
+
+	*fence = &ufence->fence;
+	*user_handle = ufence->base.hash.key;
+
+	return 0;
+      out_err1:
+	ttm_fence_object_unref(&tmp);
+	tmp = &ufence->fence;
+	ttm_fence_object_unref(&tmp);
+	return ret;
+      out_err0:
+	ttm_mem_global_free(fdev->mem_glob, sizeof(*ufence), 0);
+	kfree(ufence);
+	return ret;
+}
+
+int ttm_fence_signaled_ioctl(struct ttm_object_file *tfile, void *data)
+{
+	int ret;
+	union ttm_fence_signaled_arg *arg = data;
+	struct ttm_fence_object *fence;
+	struct ttm_fence_info info;
+	struct ttm_fence_user_object *ufence;
+	struct ttm_base_object *base;
+	ret = 0;
+
+	ufence = ttm_fence_user_object_lookup(tfile, arg->req.handle);
+	if (unlikely(ufence == NULL))
+		return -EINVAL;
+
+	fence = &ufence->fence;
+
+	if (arg->req.flush) {
+		ret = ttm_fence_object_flush(fence, arg->req.fence_type);
+		if (unlikely(ret != 0))
+			goto out;
+	}
+
+	info = ttm_fence_get_info(fence);
+	arg->rep.signaled_types = info.signaled_types;
+	arg->rep.fence_error = info.error;
+
+      out:
+	base = &ufence->base;
+	ttm_base_object_unref(&base);
+	return ret;
+}
+
+int ttm_fence_finish_ioctl(struct ttm_object_file *tfile, void *data)
+{
+	int ret;
+	union ttm_fence_finish_arg *arg = data;
+	struct ttm_fence_user_object *ufence;
+	struct ttm_base_object *base;
+	struct ttm_fence_object *fence;
+	ret = 0;
+
+	ufence = ttm_fence_user_object_lookup(tfile, arg->req.handle);
+	if (unlikely(ufence == NULL))
+		return -EINVAL;
+
+	fence = &ufence->fence;
+
+	ret = ttm_fence_object_wait(fence,
+				    arg->req.mode & TTM_FENCE_FINISH_MODE_LAZY,
+				    1, arg->req.fence_type);
+	if (likely(ret == 0)) {
+		struct ttm_fence_info info = ttm_fence_get_info(fence);
+
+		arg->rep.signaled_types = info.signaled_types;
+		arg->rep.fence_error = info.error;
+	}
+
+	base = &ufence->base;
+	ttm_base_object_unref(&base);
+
+	return ret;
+}
+
+int ttm_fence_unref_ioctl(struct ttm_object_file *tfile, void *data)
+{
+	struct ttm_fence_unref_arg *arg = data;
+	int ret = 0;
+
+	ret = ttm_ref_object_base_unref(tfile, arg->handle, ttm_fence_type);
+	return ret;
+}

linux-core/ttm/ttm_fence_user.h

@@ -0,0 +1,147 @@
+/**************************************************************************
+ *
+ * Copyright 2006-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
+ * All Rights Reserved.
+ * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ **************************************************************************/
+/*
+ * Authors
+ * Thomas Hellström <thomas-at-tungstengraphics-dot-com>
+ */
+
+#ifndef TTM_FENCE_USER_H
+#define TTM_FENCE_USER_H
+
+#if !defined(__KERNEL__) && !defined(_KERNEL)
+#include <stdint.h>
+#endif
+
+#define TTM_FENCE_MAJOR 0
+#define TTM_FENCE_MINOR 1
+#define TTM_FENCE_PL    0
+#define TTM_FENCE_DATE  "080819"
+
+/**
+ * struct ttm_fence_signaled_req
+ *
+ * @handle: Handle to the fence object. Input.
+ *
+ * @fence_type: Fence types we want to flush. Input.
+ *
+ * @flush: Boolean. Flush the indicated fence_types. Input.
+ *
+ * Argument to the TTM_FENCE_SIGNALED ioctl.
+ */
+
+struct ttm_fence_signaled_req {
+	uint32_t handle;
+	uint32_t fence_type;
+	int32_t flush;
+	uint32_t pad64;
+};
+
+/**
+ * struct ttm_fence_rep
+ *
+ * @signaled_types: Fence type that has signaled.
+ *
+ * @fence_error: Command execution error.
+ * Hardware errors that are consequences of the execution
+ * of the command stream preceding the fence are reported
+ * here.
+ *
+ * Output argument to the TTM_FENCE_SIGNALED and
+ * TTM_FENCE_FINISH ioctls.
+ */
+
+struct ttm_fence_rep {
+	uint32_t signaled_types;
+	uint32_t fence_error;
+};
+
+union ttm_fence_signaled_arg {
+	struct ttm_fence_signaled_req req;
+	struct ttm_fence_rep rep;
+};
+
+/*
+ * Waiting mode flags for the TTM_FENCE_FINISH ioctl.
+ *
+ * TTM_FENCE_FINISH_MODE_LAZY: Allow for sleeps during polling
+ * wait.
+ *
+ * TTM_FENCE_FINISH_MODE_NO_BLOCK: Don't block waiting for GPU,
+ * but return -EBUSY if the buffer is busy.
+ */
+
+#define TTM_FENCE_FINISH_MODE_LAZY     (1 << 0)
+#define TTM_FENCE_FINISH_MODE_NO_BLOCK (1 << 1)
+
+/**
+ * struct ttm_fence_finish_req
+ *
+ * @handle: Handle to the fence object. Input.
+ *
+ * @fence_type: Fence types we want to finish.
+ *
+ * @mode: Wait mode.
+ *
+ * Input to the TTM_FENCE_FINISH ioctl.
+ */
+
+struct ttm_fence_finish_req {
+	uint32_t handle;
+	uint32_t fence_type;
+	uint32_t mode;
+	uint32_t pad64;
+};
+
+union ttm_fence_finish_arg {
+	struct ttm_fence_finish_req req;
+	struct ttm_fence_rep rep;
+};
+
+/**
+ * struct ttm_fence_unref_arg
+ *
+ * @handle: Handle to the fence object.
+ *
+ * Argument to the TTM_FENCE_UNREF ioctl.
+ */
+
+struct ttm_fence_unref_arg {
+	uint32_t handle;
+	uint32_t pad64;
+};
+
+/*
+ * Ioctl offsets frome extenstion start.
+ */
+
+#define TTM_FENCE_SIGNALED 0x01
+#define TTM_FENCE_FINISH   0x02
+#define TTM_FENCE_UNREF    0x03
+
+#endif

linux-core/ttm/ttm_lock.c

@@ -0,0 +1,146 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2007-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
+ * All Rights Reserved.
+ * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellström <thomas-at-tungstengraphics-dot-com>
+ */
+
+#include "ttm/ttm_lock.h"
+#include <asm/atomic.h>
+#include <linux/errno.h>
+#include <linux/wait.h>
+#include <linux/sched.h>
+
+void ttm_lock_init(struct ttm_lock *lock)
+{
+	init_waitqueue_head(&lock->queue);
+	atomic_set(&lock->write_lock_pending, 0);
+	atomic_set(&lock->readers, 0);
+}
+
+void ttm_read_unlock(struct ttm_lock *lock)
+{
+	if (atomic_dec_and_test(&lock->readers))
+		wake_up_all(&lock->queue);
+}
+
+int ttm_read_lock(struct ttm_lock *lock, bool interruptible)
+{
+	while (unlikely(atomic_read(&lock->write_lock_pending) != 0)) {
+		int ret;
+
+		if (!interruptible) {
+			wait_event(lock->queue,
+				   atomic_read(&lock->write_lock_pending) == 0);
+			continue;
+		}
+		ret = wait_event_interruptible
+		    (lock->queue, atomic_read(&lock->write_lock_pending) == 0);
+		if (ret)
+			return -ERESTART;
+	}
+
+	while (unlikely(!atomic_add_unless(&lock->readers, 1, -1))) {
+		int ret;
+		if (!interruptible) {
+			wait_event(lock->queue,
+				   atomic_read(&lock->readers) != -1);
+			continue;
+		}
+		ret = wait_event_interruptible
+		    (lock->queue, atomic_read(&lock->readers) != -1);
+		if (ret)
+			return -ERESTART;
+	}
+	return 0;
+}
+
+static int __ttm_write_unlock(struct ttm_lock *lock)
+{
+	if (unlikely(atomic_cmpxchg(&lock->readers, -1, 0) != -1))
+		return -EINVAL;
+	wake_up_all(&lock->queue);
+	return 0;
+}
+
+static void ttm_write_lock_remove(struct ttm_base_object **p_base)
+{
+	struct ttm_base_object *base = *p_base;
+	struct ttm_lock *lock = container_of(base, struct ttm_lock, base);
+	int ret;
+
+	*p_base = NULL;
+	ret = __ttm_write_unlock(lock);
+	BUG_ON(ret != 0);
+}
+
+int ttm_write_lock(struct ttm_lock *lock, bool interruptible,
+		   struct ttm_object_file *tfile)
+{
+	int ret = 0;
+
+	atomic_inc(&lock->write_lock_pending);
+
+	while (unlikely(atomic_cmpxchg(&lock->readers, 0, -1) != 0)) {
+		if (!interruptible) {
+			wait_event(lock->queue,
+				   atomic_read(&lock->readers) == 0);
+			continue;
+		}
+		ret = wait_event_interruptible
+		    (lock->queue, atomic_read(&lock->readers) == 0);
+
+		if (ret) {
+			atomic_dec(&lock->write_lock_pending);
+			wake_up_all(&lock->queue);
+			return -ERESTART;
+		}
+	}
+
+	if (atomic_dec_and_test(&lock->write_lock_pending))
+		wake_up_all(&lock->queue);
+
+	/*
+	 * Add a base-object, the destructor of which will
+	 * make sure the lock is released if the client dies
+	 * while holding it.
+	 */
+
+	ret = ttm_base_object_init(tfile, &lock->base, 0,
+				   ttm_lock_type, &ttm_write_lock_remove, NULL);
+	if (ret)
+		(void)__ttm_write_unlock(lock);
+
+	return ret;
+}
+
+int ttm_write_unlock(struct ttm_lock *lock, struct ttm_object_file *tfile)
+{
+	return ttm_ref_object_base_unref(tfile,
+					 lock->base.hash.key, TTM_REF_USAGE);
+}

linux-core/ttm/ttm_lock.h

@@ -0,0 +1,153 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2007-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
+ * All Rights Reserved.
+ * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
+ */
+
+/** @file ttm_lock.h
+ * This file implements a simple replacement for the buffer manager use
+ * of the DRM heavyweight hardware lock.
+ * The lock is a read-write lock. Taking it in read mode is fast, and
+ * intended for in-kernel use only.
+ * Taking it in write mode is slow.
+ *
+ * The write mode is used only when there is a need to block all
+ * user-space processes from validating buffers.
+ * It's allowed to leave kernel space with the write lock held.
+ * If a user-space process dies while having the write-lock,
+ * it will be released during the file descriptor release.
+ *
+ * The read lock is typically placed at the start of an IOCTL- or
+ * user-space callable function that may end up allocating a memory area.
+ * This includes setstatus, super-ioctls and faults; the latter may move
+ * unmappable regions to mappable. It's a bug to leave kernel space with the
+ * read lock held.
+ *
+ * Both read- and write lock taking is interruptible for low signal-delivery
+ * latency. The locking functions will return -ERESTART if interrupted by a
+ * signal.
+ *
+ * Locking order: The lock should be taken BEFORE any TTM mutexes
+ * or spinlocks.
+ *
+ * Typical usages:
+ * a) VT-switching, when we want to clean VRAM and perhaps AGP. The lock
+ * stops it from being repopulated.
+ * b) out-of-VRAM or out-of-aperture space, in which case the process
+ * receiving the out-of-space notification may take the lock in write mode
+ * and evict all buffers prior to start validating its own buffers.
+ */
+
+#ifndef _TTM_LOCK_H_
+#define _TTM_LOCK_H_
+
+#include "ttm_object.h"
+#include <linux/wait.h>
+#include <asm/atomic.h>
+
+/**
+ * struct ttm_lock
+ *
+ * @base: ttm base object used solely to release the lock if the client
+ * holding the lock dies.
+ * @queue: Queue for processes waiting for lock change-of-status.
+ * @write_lock_pending: Flag indicating that a write-lock is pending. Avoids
+ * write lock starvation.
+ * @readers: The lock status: A negative number indicates that a write lock is
+ * held. Positive values indicate number of concurrent readers.
+ */
+
+struct ttm_lock {
+	struct ttm_base_object base;
+	wait_queue_head_t queue;
+	atomic_t write_lock_pending;
+	atomic_t readers;
+};
+
+/**
+ * ttm_lock_init
+ *
+ * @lock: Pointer to a struct ttm_lock
+ * Initializes the lock.
+ */
+extern void ttm_lock_init(struct ttm_lock *lock);
+
+/**
+ * ttm_read_unlock
+ *
+ * @lock: Pointer to a struct ttm_lock
+ *
+ * Releases a read lock.
+ */
+
+extern void ttm_read_unlock(struct ttm_lock *lock);
+
+/**
+ * ttm_read_unlock
+ *
+ * @lock: Pointer to a struct ttm_lock
+ * @interruptible: Interruptible sleeping while waiting for a lock.
+ *
+ * Takes the lock in read mode.
+ * Returns:
+ * -ERESTART If interrupted by a signal and interruptible is true.
+ */
+
+extern int ttm_read_lock(struct ttm_lock *lock, bool interruptible);
+
+/**
+ * ttm_write_lock
+ *
+ * @lock: Pointer to a struct ttm_lock
+ * @interruptible: Interruptible sleeping while waiting for a lock.
+ * @tfile: Pointer to a struct ttm_object_file used to identify the user-space
+ * application taking the lock.
+ *
+ * Takes the lock in write mode.
+ * Returns:
+ * -ERESTART If interrupted by a signal and interruptible is true.
+ * -ENOMEM: Out of memory when locking.
+ */
+extern int ttm_write_lock(struct ttm_lock *lock, bool interruptible,
+			  struct ttm_object_file *tfile);
+
+/**
+ * ttm_write_unlock
+ *
+ * @lock: Pointer to a struct ttm_lock
+ * @tfile: Pointer to a struct ttm_object_file used to identify the user-space
+ * application taking the lock.
+ *
+ * Releases a write lock.
+ * Returns:
+ * -EINVAL If the lock was not held.
+ */
+extern int ttm_write_unlock(struct ttm_lock *lock,
+			    struct ttm_object_file *tfile);
+#endif

linux-core/ttm/ttm_memory.c

@@ -0,0 +1,227 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2006-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
+ * All Rights Reserved.
+ * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+#include "ttm/ttm_memory.h"
+#include <linux/spinlock.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/mm.h>
+
+#define TTM_MEMORY_ALLOC_RETRIES 4
+
+/**
+ * At this point we only support a single shrink callback.
+ * Extend this if needed, perhaps using a linked list of callbacks.
+ * Note that this function is reentrant:
+ * many threads may try to swap out at any given time.
+ */
+
+static void ttm_shrink(struct ttm_mem_global *glob, int from_workqueue)
+{
+	int ret;
+	struct ttm_mem_shrink *shrink;
+	uint64_t target;
+	uint64_t total_target;
+
+	spin_lock(&glob->lock);
+	if (glob->shrink == NULL)
+		goto out;
+
+	if (from_workqueue) {
+		target = glob->swap_limit;
+		total_target = glob->total_memory_swap_limit;
+	} else if (capable(CAP_SYS_ADMIN)) {
+		total_target = glob->emer_total_memory;
+		target = glob->emer_memory;
+	} else {
+		total_target = glob->max_total_memory;
+		target = glob->max_memory;
+	}
+
+	while (glob->used_memory > target ||
+	       glob->used_total_memory > total_target) {
+		shrink = glob->shrink;
+		spin_unlock(&glob->lock);
+		ret = shrink->do_shrink(shrink);
+		spin_lock(&glob->lock);
+		if (unlikely(ret != 0))
+			goto out;
+	}
+      out:
+	spin_unlock(&glob->lock);
+}
+
+static void ttm_shrink_work(struct work_struct *work)
+{
+	struct ttm_mem_global *glob =
+	    container_of(work, struct ttm_mem_global, work);
+
+	ttm_shrink(glob, 1);
+}
+
+int ttm_mem_global_init(struct ttm_mem_global *glob)
+{
+	struct sysinfo si;
+	uint64_t mem;
+
+	spin_lock_init(&glob->lock);
+	glob->swap_queue = create_singlethread_workqueue("ttm_swap");
+	INIT_WORK(&glob->work, ttm_shrink_work);
+	init_waitqueue_head(&glob->queue);
+
+	si_meminfo(&si);
+
+	mem = si.totalram - si.totalhigh;
+	mem *= si.mem_unit;
+
+	glob->max_memory = mem >> 1;
+	glob->emer_memory = (mem >> 1) + (mem >> 2);
+	glob->swap_limit = glob->max_memory - (mem >> 3);
+	glob->used_memory = 0;
+	glob->used_total_memory = 0;
+	glob->shrink = NULL;
+
+	mem = si.totalram;
+	mem *= si.mem_unit;
+
+	glob->max_total_memory = mem >> 1;
+	glob->emer_total_memory = (mem >> 1) + (mem >> 2);
+
+	glob->total_memory_swap_limit = glob->max_total_memory - (mem >> 3);
+
+	printk(KERN_INFO "TTM available graphics memory: %llu MiB\n",
+	       glob->max_total_memory >> 20);
+	printk(KERN_INFO "TTM available object memory: %llu MiB\n",
+	       glob->max_memory >> 20);
+
+	return 0;
+}
+
+void ttm_mem_global_release(struct ttm_mem_global *glob)
+{
+	printk(KERN_INFO "Used total memory is %llu bytes.\n",
+	       (unsigned long long)glob->used_total_memory);
+	flush_workqueue(glob->swap_queue);
+	destroy_workqueue(glob->swap_queue);
+	glob->swap_queue = NULL;
+}
+
+static inline void ttm_check_swapping(struct ttm_mem_global *glob)
+{
+	int needs_swapping;
+
+	spin_lock(&glob->lock);
+	needs_swapping = (glob->used_memory > glob->swap_limit ||
+			  glob->used_total_memory >
+			  glob->total_memory_swap_limit);
+	spin_unlock(&glob->lock);
+
+	if (unlikely(needs_swapping))
+		(void)queue_work(glob->swap_queue, &glob->work);
+
+}
+
+void ttm_mem_global_free(struct ttm_mem_global *glob,
+			 uint64_t amount, int himem)
+{
+	spin_lock(&glob->lock);
+	glob->used_total_memory -= amount;
+	if (!himem)
+		glob->used_memory -= amount;
+	wake_up_all(&glob->queue);
+	spin_unlock(&glob->lock);
+}
+
+static int ttm_mem_global_reserve(struct ttm_mem_global *glob,
+				  uint64_t amount, int himem, int reserve)
+{
+	uint64_t limit;
+	uint64_t lomem_limit;
+	int ret = -ENOMEM;
+
+	spin_lock(&glob->lock);
+
+	if (capable(CAP_SYS_ADMIN)) {
+		limit = glob->emer_total_memory;
+		lomem_limit = glob->emer_memory;
+	} else {
+		limit = glob->max_total_memory;
+		lomem_limit = glob->max_memory;
+	}
+
+	if (unlikely(glob->used_total_memory + amount > limit))
+		goto out_unlock;
+	if (unlikely(!himem && glob->used_memory + amount > lomem_limit))
+		goto out_unlock;
+
+	if (reserve) {
+		glob->used_total_memory += amount;
+		if (!himem)
+			glob->used_memory += amount;
+	}
+	ret = 0;
+      out_unlock:
+	spin_unlock(&glob->lock);
+	ttm_check_swapping(glob);
+
+	return ret;
+}
+
+int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
+			 int no_wait, int interruptible, int himem)
+{
+	int count = TTM_MEMORY_ALLOC_RETRIES;
+
+	while (unlikely(ttm_mem_global_reserve(glob, memory, himem, 1) != 0)) {
+		if (no_wait)
+			return -ENOMEM;
+		if (unlikely(count-- == 0))
+			return -ENOMEM;
+		ttm_shrink(glob, 0);
+	}
+
+	return 0;
+}
+
+size_t ttm_round_pot(size_t size)
+{
+	if ((size & (size - 1)) == 0)
+		return size;
+	else if (size > PAGE_SIZE)
+		return PAGE_ALIGN(size);
+	else {
+		size_t tmp_size = 4;
+
+		while (tmp_size < size)
+			tmp_size <<= 1;
+
+		return tmp_size;
+	}
+	return 0;
+}

linux-core/ttm/ttm_memory.h

@@ -0,0 +1,154 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2006-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
+ * All Rights Reserved.
+ * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+#ifndef TTM_MEMORY_H
+#define TTM_MEMORY_H
+
+#include <linux/workqueue.h>
+#include <linux/spinlock.h>
+#include <linux/wait.h>
+
+/**
+ * struct ttm_mem_shrink - callback to shrink TTM memory usage.
+ *
+ * @do_shrink: The callback function.
+ *
+ * Arguments to the do_shrink functions are intended to be passed using
+ * inheritance. That is, the argument class derives from struct ttm_mem_srink,
+ * and can be accessed using container_of().
+ */
+
+struct ttm_mem_shrink {
+	int (*do_shrink) (struct ttm_mem_shrink *);
+};
+
+/**
+ * struct ttm_mem_global - Global memory accounting structure.
+ *
+ * @shrink: A single callback to shrink TTM memory usage. Extend this
+ * to a linked list to be able to handle multiple callbacks when needed.
+ * @swap_queue: A workqueue to handle shrinking in low memory situations. We
+ * need a separate workqueue since it will spend a lot of time waiting
+ * for the GPU, and this will otherwise block other workqueue tasks(?)
+ * At this point we use only a single-threaded workqueue.
+ * @work: The workqueue callback for the shrink queue.
+ * @queue: Wait queue for processes suspended waiting for memory.
+ * @lock: Lock to protect the @shrink - and the memory accounting members,
+ * that is, essentially the whole structure with some exceptions.
+ * @emer_memory: Lowmem memory limit available for root.
+ * @max_memory: Lowmem memory limit available for non-root.
+ * @swap_limit: Lowmem memory limit where the shrink workqueue kicks in.
+ * @used_memory: Currently used lowmem memory.
+ * @used_total_memory: Currently used total (lowmem + highmem) memory.
+ * @total_memory_swap_limit: Total memory limit where the shrink workqueue
+ * kicks in.
+ * @max_total_memory: Total memory available to non-root processes.
+ * @emer_total_memory: Total memory available to root processes.
+ *
+ * Note that this structure is not per device. It should be global for all
+ * graphics devices.
+ */
+
+struct ttm_mem_global {
+	struct ttm_mem_shrink *shrink;
+	struct workqueue_struct *swap_queue;
+	struct work_struct work;
+	wait_queue_head_t queue;
+	spinlock_t lock;
+	uint64_t emer_memory;
+	uint64_t max_memory;
+	uint64_t swap_limit;
+	uint64_t used_memory;
+	uint64_t used_total_memory;
+	uint64_t total_memory_swap_limit;
+	uint64_t max_total_memory;
+	uint64_t emer_total_memory;
+};
+
+/**
+ * ttm_mem_init_shrink - initialize a struct ttm_mem_shrink object
+ *
+ * @shrink: The object to initialize.
+ * @func: The callback function.
+ */
+
+static inline void ttm_mem_init_shrink(struct ttm_mem_shrink *shrink,
+				       int (*func) (struct ttm_mem_shrink *))
+{
+	shrink->do_shrink = func;
+}
+
+/**
+ * ttm_mem_register_shrink - register a struct ttm_mem_shrink object.
+ *
+ * @glob: The struct ttm_mem_global object to register with.
+ * @shrink: An initialized struct ttm_mem_shrink object to register.
+ *
+ * Returns:
+ * -EBUSY: There's already a callback registered. (May change).
+ */
+
+static inline int ttm_mem_register_shrink(struct ttm_mem_global *glob,
+					  struct ttm_mem_shrink *shrink)
+{
+	spin_lock(&glob->lock);
+	if (glob->shrink != NULL) {
+		spin_unlock(&glob->lock);
+		return -EBUSY;
+	}
+	glob->shrink = shrink;
+	spin_unlock(&glob->lock);
+	return 0;
+}
+
+/**
+ * ttm_mem_unregister_shrink - unregister a struct ttm_mem_shrink object.
+ *
+ * @glob: The struct ttm_mem_global object to unregister from.
+ * @shrink: A previously registert struct ttm_mem_shrink object.
+ *
+ */
+
+static inline void ttm_mem_unregister_shrink(struct ttm_mem_global *glob,
+					     struct ttm_mem_shrink *shrink)
+{
+	spin_lock(&glob->lock);
+	BUG_ON(glob->shrink != shrink);
+	glob->shrink = NULL;
+	spin_unlock(&glob->lock);
+}
+
+extern int ttm_mem_global_init(struct ttm_mem_global *glob);
+extern void ttm_mem_global_release(struct ttm_mem_global *glob);
+extern int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
+				int no_wait, int interruptible, int himem);
+extern void ttm_mem_global_free(struct ttm_mem_global *glob,
+				uint64_t amount, int himem);
+extern size_t ttm_round_pot(size_t size);
+#endif

linux-core/ttm/ttm_object.c

@@ -0,0 +1,415 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2006-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
+ * All Rights Reserved.
+ * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
+ */
+/** @file ttm_ref_object.c
+ *
+ * Base- and reference object implementation for the various
+ * ttm objects. Implements reference counting, minimal security checks
+ * and release on file close.
+ */
+
+/**
+ * struct ttm_object_file
+ *
+ * @tdev: Pointer to the ttm_object_device.
+ *
+ * @lock: Lock that protects the ref_list list and the
+ * ref_hash hash tables.
+ *
+ * @ref_list: List of ttm_ref_objects to be destroyed at
+ * file release.
+ *
+ * @ref_hash: Hash tables of ref objects, one per ttm_ref_type,
+ * for fast lookup of ref objects given a base object.
+ */
+
+#include "ttm/ttm_object.h"
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <asm/atomic.h>
+
+struct ttm_object_file {
+	struct ttm_object_device *tdev;
+	rwlock_t lock;
+	struct list_head ref_list;
+	struct drm_open_hash ref_hash[TTM_REF_NUM];
+};
+
+/**
+ * struct ttm_object_device
+ *
+ * @object_lock: lock that protects the object_hash hash table.
+ *
+ * @object_hash: hash table for fast lookup of object global names.
+ *
+ * @object_count: Per device object count.
+ *
+ * This is the per-device data structure needed for ttm object management.
+ */
+
+struct ttm_object_device {
+	rwlock_t object_lock;
+	struct drm_open_hash object_hash;
+	atomic_t object_count;
+	struct ttm_mem_global *mem_glob;
+};
+
+/**
+ * struct ttm_ref_object
+ *
+ * @hash: Hash entry for the per-file object reference hash.
+ *
+ * @head: List entry for the per-file list of ref-objects.
+ *
+ * @kref: Ref count.
+ *
+ * @obj: Base object this ref object is referencing.
+ *
+ * @ref_type: Type of ref object.
+ *
+ * This is similar to an idr object, but it also has a hash table entry
+ * that allows lookup with a pointer to the referenced object as a key. In
+ * that way, one can easily detect whether a base object is referenced by
+ * a particular ttm_object_file. It also carries a ref count to avoid creating
+ * multiple ref objects if a ttm_object_file references the same base object more
+ * than once.
+ */
+
+struct ttm_ref_object {
+	struct drm_hash_item hash;
+	struct list_head head;
+	struct kref kref;
+	struct ttm_base_object *obj;
+	enum ttm_ref_type ref_type;
+	struct ttm_object_file *tfile;
+};
+
+int ttm_base_object_init(struct ttm_object_file *tfile,
+			 struct ttm_base_object *base,
+			 int shareable,
+			 enum ttm_object_type object_type,
+			 void (*refcount_release) (struct ttm_base_object **),
+			 void (*ref_obj_release) (struct ttm_base_object *,
+						  enum ttm_ref_type ref_type))
+{
+	struct ttm_object_device *tdev = tfile->tdev;
+	int ret;
+
+	base->shareable = shareable;
+	base->tfile = tfile;
+	base->refcount_release = refcount_release;
+	base->ref_obj_release = ref_obj_release;
+	base->object_type = object_type;
+	write_lock(&tdev->object_lock);
+	kref_init(&base->refcount);
+	ret = drm_ht_just_insert_please(&tdev->object_hash,
+					&base->hash,
+					(unsigned long)base, 31, 0, 0);
+	write_unlock(&tdev->object_lock);
+	if (unlikely(ret != 0))
+		goto out_err0;
+
+	ret = ttm_ref_object_add(tfile, base, TTM_REF_USAGE, NULL);
+	if (unlikely(ret != 0))
+		goto out_err1;
+
+	ttm_base_object_unref(&base);
+
+	return 0;
+      out_err1:
+	(void)drm_ht_remove_item(&tdev->object_hash, &base->hash);
+      out_err0:
+	return ret;
+}
+
+static void ttm_release_base(struct kref *kref)
+{
+	struct ttm_base_object *base =
+	    container_of(kref, struct ttm_base_object, refcount);
+	struct ttm_object_device *tdev = base->tfile->tdev;
+
+	(void)drm_ht_remove_item(&tdev->object_hash, &base->hash);
+	write_unlock(&tdev->object_lock);
+	if (base->refcount_release)
+		base->refcount_release(&base);
+	write_lock(&tdev->object_lock);
+}
+
+void ttm_base_object_unref(struct ttm_base_object **p_base)
+{
+	struct ttm_base_object *base = *p_base;
+	struct ttm_object_device *tdev = base->tfile->tdev;
+
+	//      printk(KERN_INFO "TTM base object unref.\n");
+	*p_base = NULL;
+
+	/*
+	 * Need to take the lock here to avoid racing with
+	 * users trying to look up the object.
+	 */
+
+	write_lock(&tdev->object_lock);
+	(void)kref_put(&base->refcount, &ttm_release_base);
+	write_unlock(&tdev->object_lock);
+}
+
+struct ttm_base_object *ttm_base_object_lookup(struct ttm_object_file *tfile,
+					       uint32_t key)
+{
+	struct ttm_object_device *tdev = tfile->tdev;
+	struct ttm_base_object *base;
+	struct drm_hash_item *hash;
+	int ret;
+
+	read_lock(&tdev->object_lock);
+	ret = drm_ht_find_item(&tdev->object_hash, key, &hash);
+
+	if (likely(ret == 0)) {
+		base = drm_hash_entry(hash, struct ttm_base_object, hash);
+		kref_get(&base->refcount);
+	}
+	read_unlock(&tdev->object_lock);
+
+	if (unlikely(ret != 0))
+		return NULL;
+
+	if (tfile != base->tfile && !base->shareable) {
+		printk(KERN_ERR "Attempted access of non-shareable object.\n");
+		ttm_base_object_unref(&base);
+		return NULL;
+	}
+
+	return base;
+}
+
+int ttm_ref_object_add(struct ttm_object_file *tfile,
+		       struct ttm_base_object *base,
+		       enum ttm_ref_type ref_type, int *existed)
+{
+	struct drm_open_hash *ht = &tfile->ref_hash[ref_type];
+	struct ttm_ref_object *ref;
+	struct drm_hash_item *hash;
+	struct ttm_mem_global *mem_glob = tfile->tdev->mem_glob;
+	int ret = -EINVAL;
+
+	if (existed != NULL)
+		*existed = 1;
+
+	while (ret == -EINVAL) {
+		read_lock(&tfile->lock);
+		ret = drm_ht_find_item(ht, base->hash.key, &hash);
+
+		if (ret == 0) {
+			ref = drm_hash_entry(hash, struct ttm_ref_object, hash);
+			kref_get(&ref->kref);
+			read_unlock(&tfile->lock);
+			break;
+		}
+
+		read_unlock(&tfile->lock);
+		ret = ttm_mem_global_alloc(mem_glob, sizeof(*ref), 0, 0, 0);
+		if (unlikely(ret != 0))
+			return ret;
+		ref = kmalloc(sizeof(*ref), GFP_KERNEL);
+		if (unlikely(ref == NULL)) {
+			ttm_mem_global_free(mem_glob, sizeof(*ref), 0);
+			return -ENOMEM;
+		}
+
+		ref->hash.key = base->hash.key;
+		ref->obj = base;
+		ref->tfile = tfile;
+		ref->ref_type = ref_type;
+		kref_init(&ref->kref);
+
+		write_lock(&tfile->lock);
+		ret = drm_ht_insert_item(ht, &ref->hash);
+
+		if (likely(ret == 0)) {
+			list_add_tail(&ref->head, &tfile->ref_list);
+			kref_get(&base->refcount);
+			write_unlock(&tfile->lock);
+			if (existed != NULL)
+				*existed = 0;
+			break;
+		}
+
+		write_unlock(&tfile->lock);
+		BUG_ON(ret != -EINVAL);
+
+		kfree(ref);
+		ttm_mem_global_free(mem_glob, sizeof(*ref), 0);
+	}
+
+	return ret;
+}
+
+static void ttm_ref_object_release(struct kref *kref)
+{
+	struct ttm_ref_object *ref =
+	    container_of(kref, struct ttm_ref_object, kref);
+	struct ttm_base_object *base = ref->obj;
+	struct ttm_object_file *tfile = ref->tfile;
+	struct drm_open_hash *ht;
+	struct ttm_mem_global *mem_glob = tfile->tdev->mem_glob;
+
+	ht = &tfile->ref_hash[ref->ref_type];
+	(void)drm_ht_remove_item(ht, &ref->hash);
+	list_del(&ref->head);
+	write_unlock(&tfile->lock);
+
+	if (ref->ref_type != TTM_REF_USAGE && base->ref_obj_release)
+		base->ref_obj_release(base, ref->ref_type);
+
+	ttm_base_object_unref(&ref->obj);
+	kfree(ref);
+	ttm_mem_global_free(mem_glob, sizeof(*ref), 0);
+	write_lock(&tfile->lock);
+}
+
+int ttm_ref_object_base_unref(struct ttm_object_file *tfile,
+			      unsigned long key, enum ttm_ref_type ref_type)
+{
+	struct drm_open_hash *ht = &tfile->ref_hash[ref_type];
+	struct ttm_ref_object *ref;
+	struct drm_hash_item *hash;
+	int ret;
+
+	write_lock(&tfile->lock);
+	ret = drm_ht_find_item(ht, key, &hash);
+	if (unlikely(ret != 0)) {
+		write_unlock(&tfile->lock);
+		return -EINVAL;
+	}
+	ref = drm_hash_entry(hash, struct ttm_ref_object, hash);
+	kref_put(&ref->kref, ttm_ref_object_release);
+	write_unlock(&tfile->lock);
+	return 0;
+}
+
+void ttm_object_file_release(struct ttm_object_file **p_tfile)
+{
+	struct ttm_ref_object *ref;
+	struct list_head *list;
+	struct ttm_object_file *tfile = *p_tfile;
+	unsigned int i;
+
+	*p_tfile = NULL;
+
+	write_lock(&tfile->lock);
+
+	/*
+	 * Since we release the lock within the loop, we have to
+	 * restart it from the beginning each time.
+	 */
+
+	while (!list_empty(&tfile->ref_list)) {
+		list = tfile->ref_list.next;
+		ref = list_entry(list, struct ttm_ref_object, head);
+		ttm_ref_object_release(&ref->kref);
+	}
+
+	for (i = 0; i < TTM_REF_NUM; ++i) {
+		drm_ht_remove(&tfile->ref_hash[i]);
+	}
+
+	write_unlock(&tfile->lock);
+	kfree(tfile);
+}
+
+struct ttm_object_file *ttm_object_file_init(struct ttm_object_device *tdev,
+					     unsigned int hash_order)
+{
+	struct ttm_object_file *tfile = kmalloc(sizeof(*tfile), GFP_KERNEL);
+	unsigned int i;
+	unsigned int j = 0;
+	int ret;
+
+	if (unlikely(tfile == NULL))
+		return NULL;
+
+	rwlock_init(&tfile->lock);
+	tfile->tdev = tdev;
+	INIT_LIST_HEAD(&tfile->ref_list);
+
+	for (i = 0; i < TTM_REF_NUM; ++i) {
+		ret = drm_ht_create(&tfile->ref_hash[i], hash_order);
+		if (ret) {
+			j = i;
+			goto out_err;
+		}
+	}
+
+	return tfile;
+      out_err:
+	for (i = 0; i < j; ++i) {
+		drm_ht_remove(&tfile->ref_hash[i]);
+	}
+	kfree(tfile);
+
+	return NULL;
+}
+
+struct ttm_object_device *ttm_object_device_init(struct ttm_mem_global
+						 *mem_glob,
+						 unsigned int hash_order)
+{
+	struct ttm_object_device *tdev = kmalloc(sizeof(*tdev), GFP_KERNEL);
+	int ret;
+
+	if (unlikely(tdev == NULL))
+		return NULL;
+
+	tdev->mem_glob = mem_glob;
+	rwlock_init(&tdev->object_lock);
+	atomic_set(&tdev->object_count, 0);
+	ret = drm_ht_create(&tdev->object_hash, hash_order);
+
+	if (likely(ret == 0))
+		return tdev;
+
+	kfree(tdev);
+	return NULL;
+}
+
+void ttm_object_device_release(struct ttm_object_device **p_tdev)
+{
+	struct ttm_object_device *tdev = *p_tdev;
+
+	*p_tdev = NULL;
+
+	write_lock(&tdev->object_lock);
+	drm_ht_remove(&tdev->object_hash);
+	write_unlock(&tdev->object_lock);
+
+	kfree(tdev);
+}

linux-core/ttm/ttm_object.h

@@ -0,0 +1,269 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2006-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
+ * All Rights Reserved.
+ * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
+ */
+/** @file ttm_ref_object.h
+ *
+ * Base- and reference object implementation for the various
+ * ttm objects. Implements reference counting, minimal security checks
+ * and release on file close.
+ */
+
+#ifndef _TTM_OBJECT_H_
+#define _TTM_OBJECT_H_
+
+#include <linux/list.h>
+#include "drm_hashtab.h"
+#include <linux/kref.h>
+#include <ttm/ttm_memory.h>
+
+/**
+ * enum ttm_ref_type
+ *
+ * Describes what type of reference a ref object holds.
+ *
+ * TTM_REF_USAGE is a simple refcount on a base object.
+ *
+ * TTM_REF_SYNCCPU_READ is a SYNCCPU_READ reference on a
+ * buffer object.
+ *
+ * TTM_REF_SYNCCPU_WRITE is a SYNCCPU_WRITE reference on a
+ * buffer object.
+ *
+ */
+
+enum ttm_ref_type {
+	TTM_REF_USAGE,
+	TTM_REF_SYNCCPU_READ,
+	TTM_REF_SYNCCPU_WRITE,
+	TTM_REF_NUM
+};
+
+/**
+ * enum ttm_object_type
+ *
+ * One entry per ttm object type.
+ * Device-specific types should use the
+ * ttm_driver_typex types.
+ */
+
+enum ttm_object_type {
+	ttm_fence_type,
+	ttm_buffer_type,
+	ttm_lock_type,
+	ttm_driver_type0 = 256,
+	ttm_driver_type1
+};
+
+struct ttm_object_file;
+struct ttm_object_device;
+
+/**
+ * struct ttm_base_object
+ *
+ * @hash: hash entry for the per-device object hash.
+ * @type: derived type this object is base class for.
+ * @shareable: Other ttm_object_files can access this object.
+ *
+ * @tfile: Pointer to ttm_object_file of the creator.
+ * NULL if the object was not created by a user request.
+ * (kernel object).
+ *
+ * @refcount: Number of references to this object, not
+ * including the hash entry. A reference to a base object can
+ * only be held by a ref object.
+ *
+ * @refcount_release: A function to be called when there are
+ * no more references to this object. This function should
+ * destroy the object (or make sure destruction eventually happens),
+ * and when it is called, the object has
+ * already been taken out of the per-device hash. The parameter
+ * "base" should be set to NULL by the function.
+ *
+ * @ref_obj_release: A function to be called when a reference object
+ * with another ttm_ref_type than TTM_REF_USAGE is deleted.
+ * this function may, for example, release a lock held by a user-space
+ * process.
+ *
+ * This struct is intended to be used as a base struct for objects that
+ * are visible to user-space. It provides a global name, race-safe
+ * access and refcounting, minimal access contol and hooks for unref actions.
+ */
+
+struct ttm_base_object {
+	struct drm_hash_item hash;
+	enum ttm_object_type object_type;
+	int shareable;
+	struct ttm_object_file *tfile;
+	struct kref refcount;
+	void (*refcount_release) (struct ttm_base_object ** base);
+	void (*ref_obj_release) (struct ttm_base_object * base,
+				 enum ttm_ref_type ref_type);
+};
+
+/**
+ * ttm_base_object_init
+ *
+ * @tfile: Pointer to a struct ttm_object_file.
+ * @base: The struct ttm_base_object to initialize.
+ * @shareable: This object is shareable with other applcations.
+ * (different @tfile pointers.)
+ * @type: The object type.
+ * @refcount_release: See the struct ttm_base_object description.
+ * @ref_obj_release: See the struct ttm_base_object description.
+ *
+ * Initializes a struct ttm_base_object.
+ */
+
+extern int ttm_base_object_init(struct ttm_object_file *tfile,
+				struct ttm_base_object *base,
+				int shareable,
+				enum ttm_object_type type,
+				void (*refcount_release) (struct ttm_base_object
+							  **),
+				void (*ref_obj_release) (struct ttm_base_object
+							 *,
+							 enum ttm_ref_type
+							 ref_type));
+
+/**
+ * ttm_base_object_lookup
+ *
+ * @tfile: Pointer to a struct ttm_object_file.
+ * @key: Hash key
+ *
+ * Looks up a struct ttm_base_object with the key @key.
+ * Also verifies that the object is visible to the application, by
+ * comparing the @tfile argument and checking the object shareable flag.
+ */
+
+extern struct ttm_base_object *ttm_base_object_lookup(struct ttm_object_file
+						      *tfile, uint32_t key);
+
+/**
+ * ttm_base_object_unref
+ *
+ * @p_base: Pointer to a pointer referncing a struct ttm_base_object.
+ *
+ * Decrements the base object refcount and clears the pointer pointed to by
+ * p_base.
+ */
+
+extern void ttm_base_object_unref(struct ttm_base_object **p_base);
+
+/**
+ * ttm_ref_object_add.
+ *
+ * @tfile: A struct ttm_object_file representing the application owning the
+ * ref_object.
+ * @base: The base object to reference.
+ * @ref_type: The type of reference.
+ * @existed: Upon completion, indicates that an identical reference object
+ * already existed, and the refcount was upped on that object instead.
+ *
+ * Adding a ref object to a base object is basically like referencing the
+ * base object, but a user-space application holds the reference. When the
+ * file corresponding to @tfile is closed, all its reference objects are
+ * deleted. A reference object can have different types depending on what
+ * it's intended for. It can be refcounting to prevent object destruction,
+ * When user-space takes a lock, it can add a ref object to that lock to
+ * make sure the lock is released if the application dies. A ref object
+ * will hold a single reference on a base object.
+ */
+extern int ttm_ref_object_add(struct ttm_object_file *tfile,
+			      struct ttm_base_object *base,
+			      enum ttm_ref_type ref_type, int *existed);
+/**
+ * ttm_ref_object_base_unref
+ *
+ * @key: Key representing the base object.
+ * @ref_type: Ref type of the ref object to be dereferenced.
+ *
+ * Unreference a ref object with type @ref_type
+ * on the base object identified by @key. If there are no duplicate
+ * references, the ref object will be destroyed and the base object
+ * will be unreferenced.
+ */
+extern int ttm_ref_object_base_unref(struct ttm_object_file *tfile,
+				     unsigned long key,
+				     enum ttm_ref_type ref_type);
+
+/**
+ * ttm_object_file_init - initialize a struct ttm_object file
+ *
+ * @tdev: A struct ttm_object device this file is initialized on.
+ * @hash_order: Order of the hash table used to hold the reference objects.
+ *
+ * This is typically called by the file_ops::open function.
+ */
+
+extern struct ttm_object_file *ttm_object_file_init(struct ttm_object_device
+						    *tdev,
+						    unsigned int hash_order);
+
+/**
+ * ttm_object_file_release - release data held by a ttm_object_file
+ *
+ * @p_tfile: Pointer to pointer to the ttm_object_file object to release.
+ * *p_tfile will be set to NULL by this function.
+ *
+ * Releases all data associated by a ttm_object_file.
+ * Typically called from file_ops::release. The caller must
+ * ensure that there are no concurrent users of tfile.
+ */
+
+extern void ttm_object_file_release(struct ttm_object_file **p_tfile);
+
+/**
+ * ttm_object device init - initialize a struct ttm_object_device
+ *
+ * @hash_order: Order of hash table used to hash the base objects.
+ *
+ * This function is typically called on device initialization to prepare
+ * data structures needed for ttm base and ref objects.
+ */
+
+extern struct ttm_object_device *ttm_object_device_init
+    (struct ttm_mem_global *mem_glob, unsigned int hash_order);
+
+/**
+ * ttm_object_device_release - release data held by a ttm_object_device
+ *
+ * @p_tdev: Pointer to pointer to the ttm_object_device object to release.
+ * *p_tdev will be set to NULL by this function.
+ *
+ * Releases all data associated by a ttm_object_device.
+ * Typically called from driver::unload before the destruction of the
+ * device private data structure.
+ */
+
+extern void ttm_object_device_release(struct ttm_object_device **p_tdev);
+
+#endif

linux-core/ttm/ttm_pat_compat.c

@@ -0,0 +1,178 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2007-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
+ * All Rights Reserved.
+ * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
+ */
+
+#include "ttm/ttm_pat_compat.h"
+#include <linux/version.h>
+
+#include <linux/spinlock.h>
+#include <asm/pgtable.h>
+
+#if (defined(CONFIG_X86) && !defined(CONFIG_X86_PAT))
+#include <asm/tlbflush.h>
+#include <asm/msr.h>
+#include <asm/system.h>
+#include <linux/notifier.h>
+#include <linux/cpu.h>
+
+#ifndef MSR_IA32_CR_PAT
+#define MSR_IA32_CR_PAT 0x0277
+#endif
+
+#ifndef _PAGE_PAT
+#define _PAGE_PAT 0x080
+#endif
+
+static int ttm_has_pat = 0;
+
+/*
+ * Used at resume-time when CPU-s are fired up.
+ */
+
+static void ttm_pat_ipi_handler(void *notused)
+{
+	u32 v1, v2;
+
+	rdmsr(MSR_IA32_CR_PAT, v1, v2);
+	v2 &= 0xFFFFFFF8;
+	v2 |= 0x00000001;
+	wbinvd();
+	wrmsr(MSR_IA32_CR_PAT, v1, v2);
+	wbinvd();
+	__flush_tlb_all();
+}
+
+static void ttm_pat_enable(void)
+{
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,27))
+	if (on_each_cpu(ttm_pat_ipi_handler, NULL, 1, 1) != 0) {
+#else
+	if (on_each_cpu(ttm_pat_ipi_handler, NULL, 1) != 0) {
+#endif
+		printk(KERN_ERR "Timed out setting up CPU PAT.\n");
+	}
+}
+
+void ttm_pat_resume(void)
+{
+	if (unlikely(!ttm_has_pat))
+		return;
+
+	ttm_pat_enable();
+}
+
+static int psb_cpu_callback(struct notifier_block *nfb,
+			    unsigned long action, void *hcpu)
+{
+	if (action == CPU_ONLINE) {
+		ttm_pat_resume();
+	}
+
+	return 0;
+}
+
+static struct notifier_block psb_nb = {
+	.notifier_call = psb_cpu_callback,
+	.priority = 1
+};
+
+/*
+ * Set i386 PAT entry PAT4 to Write-combining memory type on all processors.
+ */
+
+void ttm_pat_init(void)
+{
+	if (likely(ttm_has_pat))
+		return;
+
+	if (!boot_cpu_has(X86_FEATURE_PAT)) {
+		return;
+	}
+
+	ttm_pat_enable();
+
+	if (num_present_cpus() > 1)
+		register_cpu_notifier(&psb_nb);
+
+	ttm_has_pat = 1;
+}
+
+void ttm_pat_takedown(void)
+{
+	if (unlikely(!ttm_has_pat))
+		return;
+
+	if (num_present_cpus() > 1)
+		unregister_cpu_notifier(&psb_nb);
+
+	ttm_has_pat = 0;
+}
+
+pgprot_t pgprot_ttm_x86_wc(pgprot_t prot)
+{
+	if (likely(ttm_has_pat)) {
+		pgprot_val(prot) |= _PAGE_PAT;
+		return prot;
+	} else {
+		return pgprot_noncached(prot);
+	}
+}
+
+#else
+
+void ttm_pat_init(void)
+{
+}
+
+void ttm_pat_takedown(void)
+{
+}
+
+void ttm_pat_resume(void)
+{
+}
+
+#ifdef CONFIG_X86
+#include <asm/pat.h>
+
+pgprot_t pgprot_ttm_x86_wc(pgprot_t prot)
+{
+	uint32_t cache_bits = ((1) ? _PAGE_CACHE_WC : _PAGE_CACHE_UC_MINUS);
+
+	return __pgprot((pgprot_val(prot) & ~_PAGE_CACHE_MASK) | cache_bits);
+}
+#else
+pgprot_t pgprot_ttm_x86_wc(pgprot_t prot)
+{
+	BUG();
+}
+#endif
+#endif

linux-core/ttm/ttm_pat_compat.h

@@ -0,0 +1,41 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2007-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
+ * All Rights Reserved.
+ * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
+ */
+
+#ifndef _TTM_PAT_COMPAT_
+#define _TTM_PAT_COMPAT_
+#include <asm/page.h>
+
+extern void ttm_pat_init(void);
+extern void ttm_pat_takedown(void);
+extern void ttm_pat_resume(void);
+extern pgprot_t pgprot_ttm_x86_wc(pgprot_t prot);
+#endif

linux-core/ttm/ttm_placement_common.h

@@ -0,0 +1,94 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2006-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
+ * All Rights Reserved.
+ * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
+ */
+
+#ifndef _TTM_PL_COMMON_H_
+#define _TTM_PL_COMMON_H_
+/*
+ * Memory regions for data placement.
+ */
+
+#define TTM_PL_SYSTEM           0
+#define TTM_PL_TT               1
+#define TTM_PL_VRAM             2
+#define TTM_PL_PRIV0            3
+#define TTM_PL_PRIV1            4
+#define TTM_PL_PRIV2            5
+#define TTM_PL_PRIV3            6
+#define TTM_PL_PRIV4            7
+#define TTM_PL_PRIV5            8
+#define TTM_PL_SWAPPED          15
+
+#define TTM_PL_FLAG_SYSTEM      (1 << TTM_PL_SYSTEM)
+#define TTM_PL_FLAG_TT          (1 << TTM_PL_TT)
+#define TTM_PL_FLAG_VRAM        (1 << TTM_PL_VRAM)
+#define TTM_PL_FLAG_PRIV0       (1 << TTM_PL_PRIV0)
+#define TTM_PL_FLAG_PRIV1       (1 << TTM_PL_PRIV1)
+#define TTM_PL_FLAG_PRIV2       (1 << TTM_PL_PRIV2)
+#define TTM_PL_FLAG_PRIV3       (1 << TTM_PL_PRIV3)
+#define TTM_PL_FLAG_PRIV4       (1 << TTM_PL_PRIV4)
+#define TTM_PL_FLAG_PRIV5       (1 << TTM_PL_PRIV5)
+#define TTM_PL_FLAG_SWAPPED     (1 << TTM_PL_SWAPPED)
+#define TTM_PL_MASK_MEM         0x0000FFFF
+
+/*
+ * Other flags that affects data placement.
+ * TTM_PL_FLAG_CACHED indicates cache-coherent mappings
+ * if available.
+ * TTM_PL_FLAG_SHARED means that another application may
+ * reference the buffer.
+ * TTM_PL_FLAG_NO_EVICT means that the buffer may never
+ * be evicted to make room for other buffers.
+ */
+
+#define TTM_PL_FLAG_CACHED      (1 << 16)
+#define TTM_PL_FLAG_UNCACHED    (1 << 17)
+#define TTM_PL_FLAG_WC          (1 << 18)
+#define TTM_PL_FLAG_SHARED      (1 << 20)
+#define TTM_PL_FLAG_NO_EVICT    (1 << 21)
+
+#define TTM_PL_MASK_CACHING     (TTM_PL_FLAG_CACHED | \
+                                 TTM_PL_FLAG_UNCACHED | \
+                                 TTM_PL_FLAG_WC)
+
+#define TTM_PL_MASK_MEMTYPE     (TTM_PL_MASK_MEM | TTM_PL_MASK_CACHING)
+
+/*
+ * Access flags to be used for CPU- and GPU- mappings.
+ * The idea is that the TTM synchronization mechanism will
+ * allow concurrent READ access and exclusive write access.
+ * Currently GPU- and CPU accesses are exclusive.
+ */
+
+#define TTM_ACCESS_READ         (1 << 0)
+#define TTM_ACCESS_WRITE        (1 << 1)
+
+#endif

linux-core/ttm/ttm_placement_user.c

@@ -0,0 +1,468 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2006-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
+ */
+
+#include "ttm/ttm_placement_user.h"
+#include "ttm/ttm_bo_driver.h"
+#include "ttm/ttm_object.h"
+#include "ttm/ttm_userobj_api.h"
+#include "ttm/ttm_lock.h"
+
+struct ttm_bo_user_object {
+	struct ttm_base_object base;
+	struct ttm_buffer_object bo;
+};
+
+static size_t pl_bo_size = 0;
+
+static size_t ttm_pl_size(struct ttm_bo_device *bdev, unsigned long num_pages)
+{
+	size_t page_array_size =
+	    (num_pages * sizeof(void *) + PAGE_SIZE - 1) & PAGE_MASK;
+
+	if (unlikely(pl_bo_size == 0)) {
+		pl_bo_size = bdev->ttm_bo_extra_size +
+		    ttm_round_pot(sizeof(struct ttm_bo_user_object));
+	}
+
+	return bdev->ttm_bo_size + 2 * page_array_size;
+}
+
+static struct ttm_bo_user_object *ttm_bo_user_lookup(struct ttm_object_file
+						     *tfile, uint32_t handle)
+{
+	struct ttm_base_object *base;
+
+	base = ttm_base_object_lookup(tfile, handle);
+	if (unlikely(base == NULL)) {
+		printk(KERN_ERR "Invalid buffer object handle 0x%08lx.\n",
+		       (unsigned long)handle);
+		return NULL;
+	}
+
+	if (unlikely(base->object_type != ttm_buffer_type)) {
+		ttm_base_object_unref(&base);
+		printk(KERN_ERR "Invalid buffer object handle 0x%08lx.\n",
+		       (unsigned long)handle);
+		return NULL;
+	}
+
+	return container_of(base, struct ttm_bo_user_object, base);
+}
+
+struct ttm_buffer_object *ttm_buffer_object_lookup(struct ttm_object_file
+						   *tfile, uint32_t handle)
+{
+	struct ttm_bo_user_object *user_bo;
+	struct ttm_base_object *base;
+
+	user_bo = ttm_bo_user_lookup(tfile, handle);
+	if (unlikely(user_bo == NULL))
+		return NULL;
+
+	(void)ttm_bo_reference(&user_bo->bo);
+	base = &user_bo->base;
+	ttm_base_object_unref(&base);
+	return &user_bo->bo;
+}
+
+static void ttm_bo_user_destroy(struct ttm_buffer_object *bo)
+{
+	struct ttm_bo_user_object *user_bo =
+	    container_of(bo, struct ttm_bo_user_object, bo);
+
+	kfree(user_bo);
+	ttm_mem_global_free(bo->bdev->mem_glob, bo->acc_size, 0);
+}
+
+static void ttm_bo_user_release(struct ttm_base_object **p_base)
+{
+	struct ttm_bo_user_object *user_bo;
+	struct ttm_base_object *base = *p_base;
+	struct ttm_buffer_object *bo;
+
+	*p_base = NULL;
+
+	if (unlikely(base == NULL))
+		return;
+
+	user_bo = container_of(base, struct ttm_bo_user_object, base);
+	bo = &user_bo->bo;
+	ttm_bo_unref(&bo);
+}
+
+static void ttm_bo_user_ref_release(struct ttm_base_object *base,
+				    enum ttm_ref_type ref_type)
+{
+	struct ttm_bo_user_object *user_bo =
+	    container_of(base, struct ttm_bo_user_object, base);
+	struct ttm_buffer_object *bo = &user_bo->bo;
+
+	switch (ref_type) {
+	case TTM_REF_SYNCCPU_WRITE:
+		ttm_bo_synccpu_write_release(bo);
+		break;
+	default:
+		BUG();
+	}
+}
+
+static void ttm_pl_fill_rep(struct ttm_buffer_object *bo,
+			    struct ttm_pl_rep *rep)
+{
+	struct ttm_bo_user_object *user_bo =
+	    container_of(bo, struct ttm_bo_user_object, bo);
+
+	rep->gpu_offset = bo->offset;
+	rep->bo_size = bo->num_pages << PAGE_SHIFT;
+	rep->map_handle = bo->addr_space_offset;
+	rep->placement = bo->mem.flags;
+	rep->handle = user_bo->base.hash.key;
+	rep->sync_object_arg = (uint32_t) (unsigned long)bo->sync_obj_arg;
+}
+
+int ttm_pl_create_ioctl(struct ttm_object_file *tfile,
+			struct ttm_bo_device *bdev,
+			struct ttm_lock *lock, void *data)
+{
+	union ttm_pl_create_arg *arg = data;
+	struct ttm_pl_create_req *req = &arg->req;
+	struct ttm_pl_rep *rep = &arg->rep;
+	struct ttm_buffer_object *bo;
+	struct ttm_buffer_object *tmp;
+	struct ttm_bo_user_object *user_bo;
+	uint32_t flags;
+	int ret = 0;
+	struct ttm_mem_global *mem_glob = bdev->mem_glob;
+	size_t acc_size =
+	    ttm_pl_size(bdev, (req->size + PAGE_SIZE - 1) >> PAGE_SHIFT);
+	ret = ttm_mem_global_alloc(mem_glob, acc_size, 0, 0, 0);
+	if (unlikely(ret != 0))
+		return ret;
+
+	flags = req->placement;
+	user_bo = kzalloc(sizeof(*user_bo), GFP_KERNEL);
+	if (unlikely(user_bo == NULL)) {
+		ttm_mem_global_free(mem_glob, acc_size, 0);
+		return -ENOMEM;
+	}
+
+	bo = &user_bo->bo;
+	ret = ttm_read_lock(lock, true);
+	if (unlikely(ret != 0)) {
+		kfree(user_bo);
+		ttm_mem_global_free(mem_glob, acc_size, 0);
+		return ret;
+	}
+
+	ret = ttm_buffer_object_init(bdev, bo, req->size,
+				     ttm_bo_type_device, flags,
+				     req->page_alignment, 0, 1,
+				     NULL, acc_size, &ttm_bo_user_destroy);
+	ttm_read_unlock(lock);
+
+	/*
+	 * Note that the ttm_buffer_object_init function
+	 * would've called the destroy function on failure!!
+	 */
+
+	if (unlikely(ret != 0))
+		goto out;
+
+	tmp = ttm_bo_reference(bo);
+	ret = ttm_base_object_init(tfile, &user_bo->base,
+				   flags & TTM_PL_FLAG_SHARED,
+				   ttm_buffer_type,
+				   &ttm_bo_user_release,
+				   &ttm_bo_user_ref_release);
+	if (unlikely(ret != 0))
+		goto out_err;
+
+	mutex_lock(&bo->mutex);
+	ttm_pl_fill_rep(bo, rep);
+	mutex_unlock(&bo->mutex);
+	ttm_bo_unref(&bo);
+      out:
+	return 0;
+      out_err:
+	ttm_bo_unref(&tmp);
+	ttm_bo_unref(&bo);
+	return ret;
+}
+
+int ttm_pl_ub_create_ioctl(struct ttm_object_file *tfile,
+			   struct ttm_bo_device *bdev,
+			   struct ttm_lock *lock, void *data)
+{
+	union ttm_pl_create_ub_arg *arg = data;
+	struct ttm_pl_create_ub_req *req = &arg->req;
+	struct ttm_pl_rep *rep = &arg->rep;
+	struct ttm_buffer_object *bo;
+	struct ttm_buffer_object *tmp;
+	struct ttm_bo_user_object *user_bo;
+	uint32_t flags;
+	int ret = 0;
+	struct ttm_mem_global *mem_glob = bdev->mem_glob;
+	size_t acc_size =
+	    ttm_pl_size(bdev, (req->size + PAGE_SIZE - 1) >> PAGE_SHIFT);
+	ret = ttm_mem_global_alloc(mem_glob, acc_size, 0, 0, 0);
+	if (unlikely(ret != 0))
+		return ret;
+
+	flags = req->placement;
+	user_bo = kzalloc(sizeof(*user_bo), GFP_KERNEL);
+	if (unlikely(user_bo == NULL)) {
+		ttm_mem_global_free(mem_glob, acc_size, 0);
+		return -ENOMEM;
+	}
+	ret = ttm_read_lock(lock, true);
+	if (unlikely(ret != 0)) {
+		ttm_mem_global_free(mem_glob, acc_size, 0);
+		kfree(user_bo);
+		return ret;
+	}
+	bo = &user_bo->bo;
+	ret = ttm_buffer_object_init(bdev, bo, req->size,
+				     ttm_bo_type_user, flags,
+				     req->page_alignment, req->user_address,
+				     1, NULL, acc_size, &ttm_bo_user_destroy);
+
+	/*
+	 * Note that the ttm_buffer_object_init function
+	 * would've called the destroy function on failure!!
+	 */
+	ttm_read_unlock(lock);
+	if (unlikely(ret != 0))
+		goto out;
+
+	tmp = ttm_bo_reference(bo);
+	ret = ttm_base_object_init(tfile, &user_bo->base,
+				   flags & TTM_PL_FLAG_SHARED,
+				   ttm_buffer_type,
+				   &ttm_bo_user_release,
+				   &ttm_bo_user_ref_release);
+	if (unlikely(ret != 0))
+		goto out_err;
+
+	mutex_lock(&bo->mutex);
+	ttm_pl_fill_rep(bo, rep);
+	mutex_unlock(&bo->mutex);
+	ttm_bo_unref(&bo);
+      out:
+	return 0;
+      out_err:
+	ttm_bo_unref(&tmp);
+	ttm_bo_unref(&bo);
+	return ret;
+}
+
+int ttm_pl_reference_ioctl(struct ttm_object_file *tfile, void *data)
+{
+	union ttm_pl_reference_arg *arg = data;
+	struct ttm_pl_rep *rep = &arg->rep;
+	struct ttm_bo_user_object *user_bo;
+	struct ttm_buffer_object *bo;
+	struct ttm_base_object *base;
+	int ret;
+
+	user_bo = ttm_bo_user_lookup(tfile, arg->req.handle);
+	if (unlikely(user_bo == NULL)) {
+		printk(KERN_ERR "Could not reference buffer object.\n");
+		return -EINVAL;
+	}
+
+	bo = &user_bo->bo;
+	ret = ttm_ref_object_add(tfile, &user_bo->base, TTM_REF_USAGE, NULL);
+	if (unlikely(ret != 0)) {
+		printk(KERN_ERR
+		       "Could not add a reference to buffer object.\n");
+		goto out;
+	}
+
+	mutex_lock(&bo->mutex);
+	ttm_pl_fill_rep(bo, rep);
+	mutex_unlock(&bo->mutex);
+
+      out:
+	base = &user_bo->base;
+	ttm_base_object_unref(&base);
+	return ret;
+}
+
+int ttm_pl_unref_ioctl(struct ttm_object_file *tfile, void *data)
+{
+	struct ttm_pl_reference_req *arg = data;
+
+	return ttm_ref_object_base_unref(tfile, arg->handle, TTM_REF_USAGE);
+}
+
+int ttm_pl_synccpu_ioctl(struct ttm_object_file *tfile, void *data)
+{
+	struct ttm_pl_synccpu_arg *arg = data;
+	struct ttm_bo_user_object *user_bo;
+	struct ttm_buffer_object *bo;
+	struct ttm_base_object *base;
+	int existed;
+	int ret;
+
+	switch (arg->op) {
+	case TTM_PL_SYNCCPU_OP_GRAB:
+		user_bo = ttm_bo_user_lookup(tfile, arg->handle);
+		if (unlikely(user_bo == NULL)) {
+			printk(KERN_ERR
+			       "Could not find buffer object for synccpu.\n");
+			return -EINVAL;
+		}
+		bo = &user_bo->bo;
+		base = &user_bo->base;
+		ret = ttm_bo_synccpu_write_grab(bo,
+						arg->access_mode &
+						TTM_PL_SYNCCPU_MODE_NO_BLOCK);
+		if (unlikely(ret != 0)) {
+			ttm_base_object_unref(&base);
+			goto out;
+		}
+		ret = ttm_ref_object_add(tfile, &user_bo->base,
+					 TTM_REF_SYNCCPU_WRITE, &existed);
+		if (existed || ret != 0)
+			ttm_bo_synccpu_write_release(bo);
+		ttm_base_object_unref(&base);
+		break;
+	case TTM_PL_SYNCCPU_OP_RELEASE:
+		ret = ttm_ref_object_base_unref(tfile, arg->handle,
+						TTM_REF_SYNCCPU_WRITE);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+      out:
+	return ret;
+}
+
+int ttm_pl_setstatus_ioctl(struct ttm_object_file *tfile,
+			   struct ttm_lock *lock, void *data)
+{
+	union ttm_pl_setstatus_arg *arg = data;
+	struct ttm_pl_setstatus_req *req = &arg->req;
+	struct ttm_pl_rep *rep = &arg->rep;
+	struct ttm_buffer_object *bo;
+	struct ttm_bo_device *bdev;
+	int ret;
+
+	bo = ttm_buffer_object_lookup(tfile, req->handle);
+	if (unlikely(bo == NULL)) {
+		printk(KERN_ERR
+		       "Could not find buffer object for setstatus.\n");
+		return -EINVAL;
+	}
+
+	bdev = bo->bdev;
+
+	ret = ttm_read_lock(lock, true);
+	if (unlikely(ret != 0))
+		goto out_err0;
+
+	ret = ttm_bo_reserve(bo, 1, 0, 0, 0);
+	if (unlikely(ret != 0))
+		goto out_err1;
+
+	ret = ttm_bo_wait_cpu(bo, 0);
+	if (unlikely(ret != 0))
+		goto out_err2;
+
+	mutex_lock(&bo->mutex);
+	ret = ttm_bo_check_placement(bo, req->set_placement,
+				     req->clr_placement);
+	if (unlikely(ret != 0))
+		goto out_err2;
+
+	bo->proposed_flags = (bo->proposed_flags | req->set_placement)
+	    & ~req->clr_placement;
+	ret = ttm_buffer_object_validate(bo, 1, 0);
+	if (unlikely(ret != 0))
+		goto out_err2;
+
+	ttm_pl_fill_rep(bo, rep);
+      out_err2:
+	mutex_unlock(&bo->mutex);
+	ttm_bo_unreserve(bo);
+      out_err1:
+	ttm_read_unlock(lock);
+      out_err0:
+	ttm_bo_unref(&bo);
+	return ret;
+}
+
+int ttm_pl_waitidle_ioctl(struct ttm_object_file *tfile, void *data)
+{
+	struct ttm_pl_waitidle_arg *arg = data;
+	struct ttm_buffer_object *bo;
+	int ret;
+
+	bo = ttm_buffer_object_lookup(tfile, arg->handle);
+	if (unlikely(bo == NULL)) {
+		printk(KERN_ERR "Could not find buffer object for waitidle.\n");
+		return -EINVAL;
+	}
+
+	ret =
+	    ttm_bo_block_reservation(bo, 1,
+				     arg->mode & TTM_PL_WAITIDLE_MODE_NO_BLOCK);
+	if (unlikely(ret != 0))
+		goto out;
+	mutex_lock(&bo->mutex);
+	ret = ttm_bo_wait(bo,
+			  arg->mode & TTM_PL_WAITIDLE_MODE_LAZY,
+			  1, arg->mode & TTM_PL_WAITIDLE_MODE_NO_BLOCK);
+	mutex_unlock(&bo->mutex);
+	ttm_bo_unblock_reservation(bo);
+      out:
+	ttm_bo_unref(&bo);
+	return ret;
+}
+
+int ttm_pl_verify_access(struct ttm_buffer_object *bo,
+			 struct ttm_object_file *tfile)
+{
+	struct ttm_bo_user_object *ubo;
+
+	/*
+	 * Check bo subclass.
+	 */
+
+	if (unlikely(bo->destroy != &ttm_bo_user_destroy))
+		return -EPERM;
+
+	ubo = container_of(bo, struct ttm_bo_user_object, bo);
+	if (likely(ubo->base.shareable || ubo->base.tfile == tfile))
+		return 0;
+
+	return -EPERM;
+}

linux-core/ttm/ttm_placement_user.h

@@ -0,0 +1,259 @@
+/**************************************************************************
+ *
+ * Copyright 2006-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
+ * All Rights Reserved.
+ * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ **************************************************************************/
+/*
+ * Authors
+ * Thomas Hellström <thomas-at-tungstengraphics-dot-com>
+ */
+
+#ifndef _TTM_PLACEMENT_USER_H_
+#define _TTM_PLACEMENT_USER_H_
+
+#if !defined(__KERNEL__) && !defined(_KERNEL)
+#include <stdint.h>
+#else
+#include <linux/kernel.h>
+#endif
+
+#include "ttm/ttm_placement_common.h"
+
+#define TTM_PLACEMENT_MAJOR 0
+#define TTM_PLACEMENT_MINOR 1
+#define TTM_PLACEMENT_PL    0
+#define TTM_PLACEMENT_DATE  "080819"
+
+/**
+ * struct ttm_pl_create_req
+ *
+ * @size: The buffer object size.
+ * @placement: Flags that indicate initial acceptable
+ *  placement.
+ * @page_alignment: Required alignment in pages.
+ *
+ * Input to the TTM_BO_CREATE ioctl.
+ */
+
+struct ttm_pl_create_req {
+	uint64_t size;
+	uint32_t placement;
+	uint32_t page_alignment;
+};
+
+/**
+ * struct ttm_pl_create_ub_req
+ *
+ * @size: The buffer object size.
+ * @user_address: User-space address of the memory area that
+ * should be used to back the buffer object cast to 64-bit.
+ * @placement: Flags that indicate initial acceptable
+ *  placement.
+ * @page_alignment: Required alignment in pages.
+ *
+ * Input to the TTM_BO_CREATE_UB ioctl.
+ */
+
+struct ttm_pl_create_ub_req {
+	uint64_t size;
+	uint64_t user_address;
+	uint32_t placement;
+	uint32_t page_alignment;
+};
+
+/**
+ * struct ttm_pl_rep
+ *
+ * @gpu_offset: The current offset into the memory region used.
+ * This can be used directly by the GPU if there are no
+ * additional GPU mapping procedures used by the driver.
+ *
+ * @bo_size: Actual buffer object size.
+ *
+ * @map_handle: Offset into the device address space.
+ * Used for map, seek, read, write. This will never change
+ * during the lifetime of an object.
+ *
+ * @placement: Flag indicating the placement status of
+ * the buffer object using the TTM_PL flags above.
+ *
+ * @sync_object_arg: Used for user-space synchronization and
+ * depends on the synchronization model used. If fences are
+ * used, this is the buffer_object::fence_type_mask
+ *
+ * Output from the TTM_PL_CREATE and TTM_PL_REFERENCE, and
+ * TTM_PL_SETSTATUS ioctls.
+ */
+
+struct ttm_pl_rep {
+	uint64_t gpu_offset;
+	uint64_t bo_size;
+	uint64_t map_handle;
+	uint32_t placement;
+	uint32_t handle;
+	uint32_t sync_object_arg;
+	uint32_t pad64;
+};
+
+/**
+ * struct ttm_pl_setstatus_req
+ *
+ * @set_placement: Placement flags to set.
+ *
+ * @clr_placement: Placement flags to clear.
+ *
+ * @handle: The object handle
+ *
+ * Input to the TTM_PL_SETSTATUS ioctl.
+ */
+
+struct ttm_pl_setstatus_req {
+	uint32_t set_placement;
+	uint32_t clr_placement;
+	uint32_t handle;
+	uint32_t pad64;
+};
+
+/**
+ * struct ttm_pl_reference_req
+ *
+ * @handle: The object to put a reference on.
+ *
+ * Input to the TTM_PL_REFERENCE and the TTM_PL_UNREFERENCE ioctls.
+ */
+
+struct ttm_pl_reference_req {
+	uint32_t handle;
+	uint32_t pad64;
+};
+
+/*
+ * ACCESS mode flags for SYNCCPU.
+ *
+ * TTM_SYNCCPU_MODE_READ will guarantee that the GPU is not
+ * writing to the buffer.
+ *
+ * TTM_SYNCCPU_MODE_WRITE will guarantee that the GPU is not
+ * accessing the buffer.
+ *
+ * TTM_SYNCCPU_MODE_NO_BLOCK makes sure the call does not wait
+ * for GPU accesses to finish but return -EBUSY.
+ *
+ * TTM_SYNCCPU_MODE_TRYCACHED Try to place the buffer in cacheable
+ * memory while synchronized for CPU.
+ */
+
+#define TTM_PL_SYNCCPU_MODE_READ      TTM_ACCESS_READ
+#define TTM_PL_SYNCCPU_MODE_WRITE     TTM_ACCESS_WRITE
+#define TTM_PL_SYNCCPU_MODE_NO_BLOCK  (1 << 2)
+#define TTM_PL_SYNCCPU_MODE_TRYCACHED (1 << 3)
+
+/**
+ * struct ttm_pl_synccpu_arg
+ *
+ * @handle: The object to synchronize.
+ *
+ * @access_mode: access mode indicated by the
+ * TTM_SYNCCPU_MODE flags.
+ *
+ * @op: indicates whether to grab or release the
+ * buffer for cpu usage.
+ *
+ * Input to the TTM_PL_SYNCCPU ioctl.
+ */
+
+struct ttm_pl_synccpu_arg {
+	uint32_t handle;
+	uint32_t access_mode;
+	enum {
+		TTM_PL_SYNCCPU_OP_GRAB,
+		TTM_PL_SYNCCPU_OP_RELEASE
+	} op;
+	uint32_t pad64;
+};
+
+/*
+ * Waiting mode flags for the TTM_BO_WAITIDLE ioctl.
+ *
+ * TTM_WAITIDLE_MODE_LAZY: Allow for sleeps during polling
+ * wait.
+ *
+ * TTM_WAITIDLE_MODE_NO_BLOCK: Don't block waiting for GPU,
+ * but return -EBUSY if the buffer is busy.
+ */
+
+#define TTM_PL_WAITIDLE_MODE_LAZY     (1 << 0)
+#define TTM_PL_WAITIDLE_MODE_NO_BLOCK (1 << 1)
+
+/**
+ * struct ttm_waitidle_arg
+ *
+ * @handle: The object to synchronize.
+ *
+ * @mode: wait mode indicated by the
+ * TTM_SYNCCPU_MODE flags.
+ *
+ * Argument to the TTM_BO_WAITIDLE ioctl.
+ */
+
+struct ttm_pl_waitidle_arg {
+	uint32_t handle;
+	uint32_t mode;
+};
+
+union ttm_pl_create_arg {
+	struct ttm_pl_create_req req;
+	struct ttm_pl_rep rep;
+};
+
+union ttm_pl_reference_arg {
+	struct ttm_pl_reference_req req;
+	struct ttm_pl_rep rep;
+};
+
+union ttm_pl_setstatus_arg {
+	struct ttm_pl_setstatus_req req;
+	struct ttm_pl_rep rep;
+};
+
+union ttm_pl_create_ub_arg {
+	struct ttm_pl_create_ub_req req;
+	struct ttm_pl_rep rep;
+};
+
+/*
+ * Ioctl offsets.
+ */
+
+#define TTM_PL_CREATE      0x00
+#define TTM_PL_REFERENCE   0x01
+#define TTM_PL_UNREF       0x02
+#define TTM_PL_SYNCCPU     0x03
+#define TTM_PL_WAITIDLE    0x04
+#define TTM_PL_SETSTATUS   0x05
+#define TTM_PL_CREATE_UB   0x06
+
+#endif

linux-core/ttm/ttm_tt.c

@@ -0,0 +1,655 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2006-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
+ * All Rights Reserved.
+ * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellström <thomas-at-tungstengraphics-dot-com>
+ */
+
+#include <linux/version.h>
+#include <linux/vmalloc.h>
+#include <linux/sched.h>
+#include <linux/highmem.h>
+#include <linux/pagemap.h>
+#include <linux/file.h>
+#include <linux/swap.h>
+#include "ttm/ttm_bo_driver.h"
+#include "ttm/ttm_placement_common.h"
+
+static int ttm_tt_swapin(struct ttm_tt *ttm);
+
+#if defined( CONFIG_X86 )
+static void ttm_tt_clflush_page(struct page *page)
+{
+	uint8_t *page_virtual;
+	unsigned int i;
+
+	if (unlikely(page == NULL))
+		return;
+
+	page_virtual = kmap_atomic(page, KM_USER0);
+
+	for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size)
+		clflush(page_virtual + i);
+
+	kunmap_atomic(page_virtual, KM_USER0);
+}
+
+static void ttm_tt_cache_flush_clflush(struct page *pages[],
+				       unsigned long num_pages)
+{
+	unsigned long i;
+
+	mb();
+	for (i = 0; i < num_pages; ++i)
+		ttm_tt_clflush_page(*pages++);
+	mb();
+}
+#else
+static void ttm_tt_ipi_handler(void *null)
+{
+	;
+}
+#endif
+
+void ttm_tt_cache_flush(struct page *pages[], unsigned long num_pages)
+{
+
+#if defined( CONFIG_X86 )
+	if (cpu_has_clflush) {
+		ttm_tt_cache_flush_clflush(pages, num_pages);
+		return;
+	}
+#else
+	if (on_each_cpu(ttm_tt_ipi_handler, NULL, 1, 1) != 0)
+		printk(KERN_ERR "Timed out waiting for drm cache flush.\n");
+#endif
+}
+
+/**
+ * Allocates storage for pointers to the pages that back the ttm.
+ *
+ * Uses kmalloc if possible. Otherwise falls back to vmalloc.
+ */
+static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
+{
+	unsigned long size = ttm->num_pages * sizeof(*ttm->pages);
+	ttm->pages = NULL;
+
+	if (size <= PAGE_SIZE)
+		ttm->pages = kzalloc(size, GFP_KERNEL);
+
+	if (!ttm->pages) {
+		ttm->pages = vmalloc_user(size);
+		if (ttm->pages)
+			ttm->page_flags |= TTM_PAGE_FLAG_VMALLOC;
+	}
+}
+
+static void ttm_tt_free_page_directory(struct ttm_tt *ttm)
+{
+	if (ttm->page_flags & TTM_PAGE_FLAG_VMALLOC) {
+		vfree(ttm->pages);
+		ttm->page_flags &= ~TTM_PAGE_FLAG_VMALLOC;
+	} else {
+		kfree(ttm->pages);
+	}
+	ttm->pages = NULL;
+}
+
+static struct page *ttm_tt_alloc_page(void)
+{
+	return alloc_page(GFP_HIGHUSER | __GFP_ZERO);
+}
+
+static void ttm_tt_free_user_pages(struct ttm_tt *ttm)
+{
+	int write;
+	int dirty;
+	struct page *page;
+	int i;
+	struct ttm_backend *be = ttm->be;
+
+	BUG_ON(!(ttm->page_flags & TTM_PAGE_FLAG_USER));
+	write = ((ttm->page_flags & TTM_PAGE_FLAG_WRITE) != 0);
+	dirty = ((ttm->page_flags & TTM_PAGE_FLAG_USER_DIRTY) != 0);
+
+	if (be)
+		be->func->clear(be);
+
+	for (i = 0; i < ttm->num_pages; ++i) {
+		page = ttm->pages[i];
+		if (page == NULL)
+			continue;
+
+		if (page == ttm->dummy_read_page) {
+			BUG_ON(write);
+			continue;
+		}
+
+		if (write && dirty && !PageReserved(page))
+			set_page_dirty_lock(page);
+
+		ttm->pages[i] = NULL;
+		ttm_mem_global_free(ttm->bdev->mem_glob, PAGE_SIZE, 0);
+		put_page(page);
+	}
+	ttm->state = tt_unpopulated;
+	ttm->first_himem_page = ttm->num_pages;
+	ttm->last_lomem_page = -1;
+}
+
+static struct page *__ttm_tt_get_page(struct ttm_tt *ttm, int index)
+{
+	struct page *p;
+	struct ttm_bo_device *bdev = ttm->bdev;
+	struct ttm_mem_global *mem_glob = bdev->mem_glob;
+	int ret;
+
+	while (NULL == (p = ttm->pages[index])) {
+		p = ttm_tt_alloc_page();
+
+		if (!p)
+			return NULL;
+
+		if (PageHighMem(p)) {
+			ret =
+			    ttm_mem_global_alloc(mem_glob, PAGE_SIZE, 0, 0, 1);
+			if (unlikely(ret != 0))
+				goto out_err;
+			ttm->pages[--ttm->first_himem_page] = p;
+		} else {
+			ret =
+			    ttm_mem_global_alloc(mem_glob, PAGE_SIZE, 0, 0, 0);
+			if (unlikely(ret != 0))
+				goto out_err;
+			ttm->pages[++ttm->last_lomem_page] = p;
+		}
+	}
+	return p;
+      out_err:
+	put_page(p);
+	return NULL;
+}
+
+struct page *ttm_tt_get_page(struct ttm_tt *ttm, int index)
+{
+	int ret;
+
+	if (unlikely(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) {
+		ret = ttm_tt_swapin(ttm);
+		if (unlikely(ret != 0))
+			return NULL;
+	}
+	return __ttm_tt_get_page(ttm, index);
+}
+
+int ttm_tt_populate(struct ttm_tt *ttm)
+{
+	struct page *page;
+	unsigned long i;
+	struct ttm_backend *be;
+	int ret;
+
+	if (ttm->state != tt_unpopulated)
+		return 0;
+
+	if (unlikely(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) {
+		ret = ttm_tt_swapin(ttm);
+		if (unlikely(ret != 0))
+			return ret;
+	}
+
+	be = ttm->be;
+
+	for (i = 0; i < ttm->num_pages; ++i) {
+		page = __ttm_tt_get_page(ttm, i);
+		if (!page)
+			return -ENOMEM;
+	}
+
+	be->func->populate(be, ttm->num_pages, ttm->pages,
+			   ttm->dummy_read_page);
+	ttm->state = tt_unbound;
+	return 0;
+}
+
+#ifdef CONFIG_X86
+static inline int ttm_tt_set_page_caching(struct page *p,
+					  enum ttm_caching_state c_state)
+{
+	if (PageHighMem(p))
+		return 0;
+
+	switch (c_state) {
+	case tt_cached:
+		return set_pages_wb(p, 1);
+	case tt_wc:
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,27))
+	    return set_memory_wc((unsigned long) page_address(p), 1);
+#endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,27)) */
+	default:
+		return set_pages_uc(p, 1);
+	}
+}
+#else /* CONFIG_X86 */
+static inline int ttm_tt_set_page_caching(struct page *p,
+					  enum ttm_caching_state c_state)
+{
+	return 0;
+}
+#endif /* CONFIG_X86 */
+
+/*
+ * Change caching policy for the linear kernel map
+ * for range of pages in a ttm.
+ */
+
+static int ttm_tt_set_caching(struct ttm_tt *ttm,
+			      enum ttm_caching_state c_state)
+{
+	int i, j;
+	struct page *cur_page;
+	int ret;
+
+	if (ttm->caching_state == c_state)
+		return 0;
+
+	if (c_state != tt_cached) {
+		ret = ttm_tt_populate(ttm);
+		if (unlikely(ret != 0))
+			return ret;
+	}
+
+	if (ttm->caching_state == tt_cached)
+		ttm_tt_cache_flush(ttm->pages, ttm->num_pages);
+
+	for (i = 0; i < ttm->num_pages; ++i) {
+		cur_page = ttm->pages[i];
+		if (likely(cur_page != NULL)) {
+			ret = ttm_tt_set_page_caching(cur_page, c_state);
+			if (unlikely(ret != 0))
+				goto out_err;
+		}
+	}
+
+	ttm->caching_state = c_state;
+
+	return 0;
+
+      out_err:
+	for (j = 0; j < i; ++j) {
+		cur_page = ttm->pages[j];
+		if (likely(cur_page != NULL)) {
+			(void)ttm_tt_set_page_caching(cur_page,
+						      ttm->caching_state);
+		}
+	}
+
+	return ret;
+}
+
+int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement)
+{
+	enum ttm_caching_state state;
+
+	if (placement & TTM_PL_FLAG_WC)
+		state = tt_wc;
+	else if (placement & TTM_PL_FLAG_UNCACHED)
+		state = tt_uncached;
+	else
+		state = tt_cached;
+
+	return ttm_tt_set_caching(ttm, state);
+}
+
+static void ttm_tt_free_alloced_pages(struct ttm_tt *ttm)
+{
+	int i;
+	struct page *cur_page;
+	struct ttm_backend *be = ttm->be;
+
+	if (be)
+		be->func->clear(be);
+	(void)ttm_tt_set_caching(ttm, tt_cached);
+	for (i = 0; i < ttm->num_pages; ++i) {
+		cur_page = ttm->pages[i];
+		ttm->pages[i] = NULL;
+		if (cur_page) {
+			if (page_count(cur_page) != 1)
+				printk(KERN_ERR
+				       "Erroneous page count. Leaking pages.\n");
+			ttm_mem_global_free(ttm->bdev->mem_glob, PAGE_SIZE,
+					    PageHighMem(cur_page));
+			__free_page(cur_page);
+		}
+	}
+	ttm->state = tt_unpopulated;
+	ttm->first_himem_page = ttm->num_pages;
+	ttm->last_lomem_page = -1;
+}
+
+void ttm_tt_destroy(struct ttm_tt *ttm)
+{
+	struct ttm_backend *be;
+
+	if (unlikely(ttm == NULL))
+		return;
+
+	be = ttm->be;
+	if (likely(be != NULL)) {
+		be->func->destroy(be);
+		ttm->be = NULL;
+	}
+
+	if (likely(ttm->pages != NULL)) {
+		if (ttm->page_flags & TTM_PAGE_FLAG_USER)
+			ttm_tt_free_user_pages(ttm);
+		else
+			ttm_tt_free_alloced_pages(ttm);
+
+		ttm_tt_free_page_directory(ttm);
+	}
+
+	if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTANT_SWAP) &&
+	    ttm->swap_storage)
+		fput(ttm->swap_storage);
+
+	kfree(ttm);
+}
+
+int ttm_tt_set_user(struct ttm_tt *ttm,
+		    struct task_struct *tsk,
+		    unsigned long start, unsigned long num_pages)
+{
+	struct mm_struct *mm = tsk->mm;
+	int ret;
+	int write = (ttm->page_flags & TTM_PAGE_FLAG_WRITE) != 0;
+	struct ttm_mem_global *mem_glob = ttm->bdev->mem_glob;
+
+	BUG_ON(num_pages != ttm->num_pages);
+	BUG_ON((ttm->page_flags & TTM_PAGE_FLAG_USER) == 0);
+
+	/**
+	 * Account user pages as lowmem pages for now.
+	 */
+
+	ret = ttm_mem_global_alloc(mem_glob, num_pages * PAGE_SIZE, 0, 0, 0);
+	if (unlikely(ret != 0))
+		return ret;
+
+	down_read(&mm->mmap_sem);
+	ret = get_user_pages(tsk, mm, start, num_pages,
+			     write, 0, ttm->pages, NULL);
+	up_read(&mm->mmap_sem);
+
+	if (ret != num_pages && write) {
+		ttm_tt_free_user_pages(ttm);
+		ttm_mem_global_free(mem_glob, num_pages * PAGE_SIZE, 0);
+		return -ENOMEM;
+	}
+
+	ttm->tsk = tsk;
+	ttm->start = start;
+	ttm->state = tt_unbound;
+
+	return 0;
+}
+
+struct ttm_tt *ttm_tt_create(struct ttm_bo_device *bdev, unsigned long size,
+			     uint32_t page_flags, struct page *dummy_read_page)
+{
+	struct ttm_bo_driver *bo_driver = bdev->driver;
+	struct ttm_tt *ttm;
+
+	if (!bo_driver)
+		return NULL;
+
+	ttm = kzalloc(sizeof(*ttm), GFP_KERNEL);
+	if (!ttm)
+		return NULL;
+
+	ttm->bdev = bdev;
+
+	ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
+	ttm->first_himem_page = ttm->num_pages;
+	ttm->last_lomem_page = -1;
+	ttm->caching_state = tt_cached;
+	ttm->page_flags = page_flags;
+
+	ttm->dummy_read_page = dummy_read_page;
+
+	ttm_tt_alloc_page_directory(ttm);
+	if (!ttm->pages) {
+		ttm_tt_destroy(ttm);
+		printk(KERN_ERR "Failed allocating page table\n");
+		return NULL;
+	}
+	ttm->be = bo_driver->create_ttm_backend_entry(bdev);
+	if (!ttm->be) {
+		ttm_tt_destroy(ttm);
+		printk(KERN_ERR "Failed creating ttm backend entry\n");
+		return NULL;
+	}
+	ttm->state = tt_unpopulated;
+	return ttm;
+}
+
+/**
+ * ttm_tt_unbind:
+ *
+ * @ttm: the object to unbind from the graphics device
+ *
+ * Unbind an object from the aperture. This removes the mappings
+ * from the graphics device and flushes caches if necessary.
+ */
+void ttm_tt_unbind(struct ttm_tt *ttm)
+{
+	int ret;
+	struct ttm_backend *be = ttm->be;
+
+	if (ttm->state == tt_bound) {
+		ret = be->func->unbind(be);
+		BUG_ON(ret);
+	}
+	ttm->state = tt_unbound;
+}
+
+/**
+ * ttm_tt_bind:
+ *
+ * @ttm: the ttm object to bind to the graphics device
+ *
+ * @bo_mem: the aperture memory region which will hold the object
+ *
+ * Bind a ttm object to the aperture. This ensures that the necessary
+ * pages are allocated, flushes CPU caches as needed and marks the
+ * ttm as DRM_TTM_PAGE_USER_DIRTY to indicate that it may have been
+ * modified by the GPU
+ */
+
+int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
+{
+	int ret = 0;
+	struct ttm_backend *be;
+
+	if (!ttm)
+		return -EINVAL;
+
+	if (ttm->state == tt_bound)
+		return 0;
+
+	be = ttm->be;
+
+	ret = ttm_tt_populate(ttm);
+	if (ret)
+		return ret;
+
+	ret = be->func->bind(be, bo_mem);
+	if (ret) {
+		printk(KERN_ERR "Couldn't bind backend.\n");
+		return ret;
+	}
+
+	ttm->state = tt_bound;
+
+	if (ttm->page_flags & TTM_PAGE_FLAG_USER)
+		ttm->page_flags |= TTM_PAGE_FLAG_USER_DIRTY;
+	return 0;
+}
+
+static int ttm_tt_swapin(struct ttm_tt *ttm)
+{
+	struct address_space *swap_space;
+	struct file *swap_storage;
+	struct page *from_page;
+	struct page *to_page;
+	void *from_virtual;
+	void *to_virtual;
+	int i;
+	int ret;
+
+	if (ttm->page_flags & TTM_PAGE_FLAG_USER) {
+		ret = ttm_tt_set_user(ttm, ttm->tsk, ttm->start,
+				      ttm->num_pages);
+		if (unlikely(ret != 0))
+			return ret;
+
+		ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
+		return 0;
+	}
+
+	swap_storage = ttm->swap_storage;
+	BUG_ON(swap_storage == NULL);
+
+	swap_space = swap_storage->f_path.dentry->d_inode->i_mapping;
+
+	for (i = 0; i < ttm->num_pages; ++i) {
+		from_page = read_mapping_page(swap_space, i, NULL);
+		if (IS_ERR(from_page))
+			goto out_err;
+		to_page = __ttm_tt_get_page(ttm, i);
+		if (unlikely(to_page == NULL))
+			goto out_err;
+
+		preempt_disable();
+		from_virtual = kmap_atomic(from_page, KM_USER0);
+		to_virtual = kmap_atomic(to_page, KM_USER1);
+		memcpy(to_virtual, from_virtual, PAGE_SIZE);
+		kunmap_atomic(to_virtual, KM_USER1);
+		kunmap_atomic(from_virtual, KM_USER0);
+		preempt_enable();
+		page_cache_release(from_page);
+	}
+
+	if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTANT_SWAP))
+		fput(swap_storage);
+	ttm->swap_storage = NULL;
+	ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
+
+	return 0;
+      out_err:
+	ttm_tt_free_alloced_pages(ttm);
+	return -ENOMEM;
+}
+
+int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistant_swap_storage)
+{
+	struct address_space *swap_space;
+	struct file *swap_storage;
+	struct page *from_page;
+	struct page *to_page;
+	void *from_virtual;
+	void *to_virtual;
+	int i;
+
+	BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated);
+	BUG_ON(ttm->caching_state != tt_cached);
+
+	/*
+	 * For user buffers, just unpin the pages, as there should be
+	 * vma references.
+	 */
+
+	if (ttm->page_flags & TTM_PAGE_FLAG_USER) {
+		ttm_tt_free_user_pages(ttm);
+		ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
+		ttm->swap_storage = NULL;
+		return 0;
+	}
+
+	if (!persistant_swap_storage) {
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,28))
+		swap_storage = shmem_file_setup("ttm swap",
+						ttm->num_pages << PAGE_SHIFT,
+						0);
+		if (unlikely(IS_ERR(swap_storage))) {
+			printk(KERN_ERR "Failed allocating swap storage.\n");
+			return -ENOMEM;
+		}
+#else
+		return -ENOMEM;
+#endif
+	} else
+		swap_storage = persistant_swap_storage;
+
+	swap_space = swap_storage->f_path.dentry->d_inode->i_mapping;
+
+	for (i = 0; i < ttm->num_pages; ++i) {
+		from_page = ttm->pages[i];
+		if (unlikely(from_page == NULL))
+			continue;
+		to_page = read_mapping_page(swap_space, i, NULL);
+		if (unlikely(to_page == NULL))
+			goto out_err;
+
+		preempt_disable();
+		from_virtual = kmap_atomic(from_page, KM_USER0);
+		to_virtual = kmap_atomic(to_page, KM_USER1);
+		memcpy(to_virtual, from_virtual, PAGE_SIZE);
+		kunmap_atomic(to_virtual, KM_USER1);
+		kunmap_atomic(from_virtual, KM_USER0);
+		preempt_enable();
+		set_page_dirty(to_page);
+		mark_page_accessed(to_page);
+//              unlock_page(to_page);
+		page_cache_release(to_page);
+	}
+
+	ttm_tt_free_alloced_pages(ttm);
+	ttm->swap_storage = swap_storage;
+	ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
+	if (persistant_swap_storage)
+		ttm->page_flags |= TTM_PAGE_FLAG_PERSISTANT_SWAP;
+
+	return 0;
+      out_err:
+	if (!persistant_swap_storage)
+		fput(swap_storage);
+
+	return -ENOMEM;
+}

linux-core/ttm/ttm_userobj_api.h

@@ -0,0 +1,79 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2006-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
+ * All Rights Reserved.
+ * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
+ */
+
+#ifndef _TTM_USEROBJ_API_H_
+#define _TTM_USEROBJ_API_H_
+
+#include "ttm/ttm_placement_user.h"
+#include "ttm/ttm_fence_user.h"
+#include "ttm/ttm_object.h"
+#include "ttm/ttm_fence_api.h"
+#include "ttm/ttm_bo_api.h"
+
+struct ttm_lock;
+
+/*
+ * User ioctls.
+ */
+
+extern int ttm_pl_create_ioctl(struct ttm_object_file *tfile,
+			       struct ttm_bo_device *bdev,
+			       struct ttm_lock *lock, void *data);
+extern int ttm_pl_ub_create_ioctl(struct ttm_object_file *tfile,
+				  struct ttm_bo_device *bdev,
+				  struct ttm_lock *lock, void *data);
+extern int ttm_pl_reference_ioctl(struct ttm_object_file *tfile, void *data);
+extern int ttm_pl_unref_ioctl(struct ttm_object_file *tfile, void *data);
+extern int ttm_pl_synccpu_ioctl(struct ttm_object_file *tfile, void *data);
+extern int ttm_pl_setstatus_ioctl(struct ttm_object_file *tfile,
+				  struct ttm_lock *lock, void *data);
+extern int ttm_pl_waitidle_ioctl(struct ttm_object_file *tfile, void *data);
+extern int ttm_fence_signaled_ioctl(struct ttm_object_file *tfile, void *data);
+extern int ttm_fence_finish_ioctl(struct ttm_object_file *tfile, void *data);
+extern int ttm_fence_unref_ioctl(struct ttm_object_file *tfile, void *data);
+
+extern int
+ttm_fence_user_create(struct ttm_fence_device *fdev,
+		      struct ttm_object_file *tfile,
+		      uint32_t fence_class,
+		      uint32_t fence_types,
+		      uint32_t create_flags,
+		      struct ttm_fence_object **fence, uint32_t * user_handle);
+
+extern struct ttm_buffer_object *ttm_buffer_object_lookup(struct ttm_object_file
+							  *tfile,
+							  uint32_t handle);
+
+extern int
+ttm_pl_verify_access(struct ttm_buffer_object *bo,
+		     struct ttm_object_file *tfile);
+#endif