mirror of
https://gitlab.freedesktop.org/mesa/drm.git
synced 2025-12-25 01:20:11 +01:00
51e38d96ea
be ported, rolled back r128 and i810 version bumps so 4.1.0 works with
cvs kernel modules, added Config.in and updated Makefile.kernel,
incorporated lots of drm fixes inspired by patches sent by Redhat, made
DRM(realloc) usage check for NULL allocations, restructure driver init
routines to export dev_priv only when initialized and to check for all
error conditions.
225 lines
6.6 KiB
C
225 lines
6.6 KiB
C
/* drm_fops.h -- File operations for DRM -*- linux-c -*-
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* Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
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*
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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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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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Rickard E. (Rik) Faith <faith@valinux.com>
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* Daryll Strauss <daryll@valinux.com>
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* Gareth Hughes <gareth@valinux.com>
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*/
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#define __NO_VERSION__
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#include "drmP.h"
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#include <linux/poll.h>
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/* drm_open is called whenever a process opens /dev/drm. */
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int DRM(open_helper)(struct inode *inode, struct file *filp, drm_device_t *dev)
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{
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kdev_t minor = MINOR(inode->i_rdev);
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drm_file_t *priv;
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if (filp->f_flags & O_EXCL) return -EBUSY; /* No exclusive opens */
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if (!DRM(cpu_valid)()) return -EINVAL;
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DRM_DEBUG("pid = %d, minor = %d\n", current->pid, minor);
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priv = DRM(alloc)(sizeof(*priv), DRM_MEM_FILES);
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if(!priv) return -ENOMEM;
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memset(priv, 0, sizeof(*priv));
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filp->private_data = priv;
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priv->uid = current->euid;
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priv->pid = current->pid;
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priv->minor = minor;
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priv->dev = dev;
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priv->ioctl_count = 0;
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priv->authenticated = capable(CAP_SYS_ADMIN);
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down(&dev->struct_sem);
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if (!dev->file_last) {
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priv->next = NULL;
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priv->prev = NULL;
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dev->file_first = priv;
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dev->file_last = priv;
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} else {
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priv->next = NULL;
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priv->prev = dev->file_last;
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dev->file_last->next = priv;
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dev->file_last = priv;
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}
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up(&dev->struct_sem);
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#ifdef __alpha__
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/*
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* Default the hose
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*/
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if (!dev->hose) {
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struct pci_dev *pci_dev;
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pci_dev = pci_find_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
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if (pci_dev) dev->hose = pci_dev->sysdata;
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if (!dev->hose) {
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struct pci_bus *b = pci_bus_b(pci_root_buses.next);
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if (b) dev->hose = b->sysdata;
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}
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}
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#endif
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return 0;
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}
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int DRM(flush)(struct file *filp)
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->dev;
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DRM_DEBUG("pid = %d, device = 0x%x, open_count = %d\n",
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current->pid, dev->device, dev->open_count);
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return 0;
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}
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int DRM(fasync)(int fd, struct file *filp, int on)
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->dev;
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int retcode;
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DRM_DEBUG("fd = %d, device = 0x%x\n", fd, dev->device);
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retcode = fasync_helper(fd, filp, on, &dev->buf_async);
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if (retcode < 0) return retcode;
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return 0;
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}
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/* The drm_read and drm_write_string code (especially that which manages
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the circular buffer), is based on Alessandro Rubini's LINUX DEVICE
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DRIVERS (Cambridge: O'Reilly, 1998), pages 111-113. */
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ssize_t DRM(read)(struct file *filp, char *buf, size_t count, loff_t *off)
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->dev;
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int left;
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int avail;
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int send;
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int cur;
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DRM_DEBUG("%p, %p\n", dev->buf_rp, dev->buf_wp);
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while (dev->buf_rp == dev->buf_wp) {
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DRM_DEBUG(" sleeping\n");
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if (filp->f_flags & O_NONBLOCK) {
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return -EAGAIN;
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}
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interruptible_sleep_on(&dev->buf_readers);
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if (signal_pending(current)) {
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DRM_DEBUG(" interrupted\n");
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return -ERESTARTSYS;
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}
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DRM_DEBUG(" awake\n");
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}
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left = (dev->buf_rp + DRM_BSZ - dev->buf_wp) % DRM_BSZ;
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avail = DRM_BSZ - left;
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send = DRM_MIN(avail, count);
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while (send) {
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if (dev->buf_wp > dev->buf_rp) {
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cur = DRM_MIN(send, dev->buf_wp - dev->buf_rp);
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} else {
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cur = DRM_MIN(send, dev->buf_end - dev->buf_rp);
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}
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if (copy_to_user(buf, dev->buf_rp, cur))
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return -EFAULT;
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dev->buf_rp += cur;
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if (dev->buf_rp == dev->buf_end) dev->buf_rp = dev->buf;
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send -= cur;
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}
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wake_up_interruptible(&dev->buf_writers);
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return DRM_MIN(avail, count);;
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}
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int DRM(write_string)(drm_device_t *dev, const char *s)
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{
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int left = (dev->buf_rp + DRM_BSZ - dev->buf_wp) % DRM_BSZ;
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int send = strlen(s);
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int count;
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DRM_DEBUG("%d left, %d to send (%p, %p)\n",
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left, send, dev->buf_rp, dev->buf_wp);
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if (left == 1 || dev->buf_wp != dev->buf_rp) {
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DRM_ERROR("Buffer not empty (%d left, wp = %p, rp = %p)\n",
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left,
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dev->buf_wp,
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dev->buf_rp);
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}
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while (send) {
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if (dev->buf_wp >= dev->buf_rp) {
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count = DRM_MIN(send, dev->buf_end - dev->buf_wp);
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if (count == left) --count; /* Leave a hole */
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} else {
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count = DRM_MIN(send, dev->buf_rp - dev->buf_wp - 1);
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}
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strncpy(dev->buf_wp, s, count);
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dev->buf_wp += count;
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if (dev->buf_wp == dev->buf_end) dev->buf_wp = dev->buf;
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send -= count;
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}
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#if LINUX_VERSION_CODE < 0x020315 && !defined(KILLFASYNCHASTHREEPARAMETERS)
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/* The extra parameter to kill_fasync was added in 2.3.21, and is
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_not_ present in _stock_ 2.2.14 and 2.2.15. However, some
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distributions patch 2.2.x kernels to add this parameter. The
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Makefile.linux attempts to detect this addition and defines
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KILLFASYNCHASTHREEPARAMETERS if three parameters are found. */
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if (dev->buf_async) kill_fasync(dev->buf_async, SIGIO);
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#else
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/* Parameter added in 2.3.21. */
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#if LINUX_VERSION_CODE < 0x020400
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if (dev->buf_async) kill_fasync(dev->buf_async, SIGIO, POLL_IN);
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#else
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/* Type of first parameter changed in
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Linux 2.4.0-test2... */
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if (dev->buf_async) kill_fasync(&dev->buf_async, SIGIO, POLL_IN);
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#endif
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#endif
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DRM_DEBUG("waking\n");
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wake_up_interruptible(&dev->buf_readers);
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return 0;
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}
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unsigned int DRM(poll)(struct file *filp, struct poll_table_struct *wait)
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->dev;
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poll_wait(filp, &dev->buf_readers, wait);
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if (dev->buf_wp != dev->buf_rp) return POLLIN | POLLRDNORM;
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return 0;
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}
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