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22574aa887
There can be scenarios, especially when re-importing an existing buffer, where you end up with multiple 'struct omap_bo's wrapping a single GEM object handle. Which causes badness when the first of the evil-clones is omap_bo_del()'d. To do this, introduce reference counting and a hashtable to track the handles per fd. First, to avoid bo's slipping through the crack if multiple 'struct omap_device's are created for one drm fd, a hashtable mapping drm fd to omap_device, and the omap_device itself is reference counted. Per omap_device, we keep a handle_table mapping GEM handle to omap_bo. When buffers are imported from flink name or dmabuf fd, the handle table is consulted, and if an omap_bo already exists, it's refcnt is incremented and it is returned. For good measure, to avoid the handle_table being deleted before the omap_bo is freed, the omap_bo holds a reference to the omap_device. TODO: check the overhead of the hashtable. If too much we could maybe get away with only tracking exported and imported bo's in the table. TODO: all the import/export flink/dmabuf operations are generic DRM ioctls. Really all this functionality could be handled by a generic drm_bo and drm_device "base class" that could be extended by omap, exynos, etc. That would also allow more common userspace code by avoiding artificial libdrm_omap dependencies. Signed-off-by: Rob Clark <rob@ti.com>
65 lines
2.5 KiB
C
65 lines
2.5 KiB
C
/*
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* Copyright (C) 2011 Texas Instruments, Inc
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Authors:
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* Rob Clark <rob@ti.com>
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*/
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#ifndef OMAP_DRMIF_H_
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#define OMAP_DRMIF_H_
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#include <xf86drm.h>
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#include <stdint.h>
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#include <omap_drm.h>
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struct omap_bo;
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struct omap_device;
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/* device related functions:
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*/
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struct omap_device * omap_device_new(int fd);
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struct omap_device * omap_device_ref(struct omap_device *dev);
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void omap_device_del(struct omap_device *dev);
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int omap_get_param(struct omap_device *dev, uint64_t param, uint64_t *value);
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int omap_set_param(struct omap_device *dev, uint64_t param, uint64_t value);
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/* buffer-object related functions:
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*/
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struct omap_bo * omap_bo_new(struct omap_device *dev,
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uint32_t size, uint32_t flags);
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struct omap_bo * omap_bo_new_tiled(struct omap_device *dev,
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uint32_t width, uint32_t height, uint32_t flags);
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struct omap_bo * omap_bo_ref(struct omap_bo *bo);
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struct omap_bo * omap_bo_from_name(struct omap_device *dev, uint32_t name);
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struct omap_bo * omap_bo_from_dmabuf(struct omap_device *dev, int fd);
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void omap_bo_del(struct omap_bo *bo);
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int omap_bo_get_name(struct omap_bo *bo, uint32_t *name);
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uint32_t omap_bo_handle(struct omap_bo *bo);
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int omap_bo_dmabuf(struct omap_bo *bo);
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uint32_t omap_bo_size(struct omap_bo *bo);
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void * omap_bo_map(struct omap_bo *bo);
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int omap_bo_cpu_prep(struct omap_bo *bo, enum omap_gem_op op);
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int omap_bo_cpu_fini(struct omap_bo *bo, enum omap_gem_op op);
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#endif /* OMAP_DRMIF_H_ */
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