234 lines
6.9 KiB
C
234 lines
6.9 KiB
C
/* fops.c -- File operations for DRM -*- linux-c -*-
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* Created: Mon Jan 4 08:58:31 1999 by faith@precisioninsight.com
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* Revised: Fri Dec 3 10:26:26 1999 by faith@precisioninsight.com
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*
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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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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* PRECISION INSIGHT 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 OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* $XFree86: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/kernel/fops.c,v 1.6 2000/02/23 04:47:27 martin Exp $
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*
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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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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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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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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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/* drm_release is called whenever a process closes /dev/drm*. Linux calls
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this only if any mappings have been closed. */
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int drm_release(struct inode *inode, 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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if (_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)
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&& dev->lock.pid == current->pid) {
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DRM_ERROR("Process %d dead, freeing lock for context %d\n",
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current->pid,
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_DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
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drm_lock_free(dev,
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&dev->lock.hw_lock->lock,
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_DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
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/* FIXME: may require heavy-handed reset of
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hardware at this point, possibly
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processed via a callback to the X
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server. */
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}
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drm_reclaim_buffers(dev, priv->pid);
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drm_fasync(-1, filp, 0);
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down(&dev->struct_sem);
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if (priv->prev) priv->prev->next = priv->next;
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else dev->file_first = priv->next;
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if (priv->next) priv->next->prev = priv->prev;
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else dev->file_last = priv->prev;
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up(&dev->struct_sem);
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drm_free(priv, sizeof(*priv), DRM_MEM_FILES);
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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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copy_to_user_ret(buf, dev->buf_rp, cur, -EINVAL);
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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
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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 (dev->buf_async) kill_fasync(dev->buf_async, SIGIO, POLL_IN);
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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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