224 lines
6.7 KiB
C
224 lines
6.7 KiB
C
/* fops.c -- File operations for DRM -*- linux-c -*-
|
|
* Created: Mon Jan 4 08:58:31 1999 by faith@precisioninsight.com
|
|
* Revised: Fri Dec 3 10:26:26 1999 by faith@precisioninsight.com
|
|
*
|
|
* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
|
|
* 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, sublicense,
|
|
* 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 NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* PRECISION INSIGHT 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.
|
|
*
|
|
* $PI: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/kernel/fops.c,v 1.3 1999/08/20 15:36:45 faith Exp $
|
|
* $XFree86: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/kernel/fops.c,v 1.1 1999/09/25 14:37:59 dawes Exp $
|
|
*
|
|
*/
|
|
|
|
#define __NO_VERSION__
|
|
#include "drmP.h"
|
|
|
|
/* drm_open is called whenever a process opens /dev/drm. */
|
|
|
|
int drm_open_helper(struct inode *inode, struct file *filp, drm_device_t *dev)
|
|
{
|
|
kdev_t minor = MINOR(inode->i_rdev);
|
|
drm_file_t *priv;
|
|
|
|
if (filp->f_flags & O_EXCL) return -EBUSY; /* No exclusive opens */
|
|
|
|
DRM_DEBUG("pid = %d, minor = %d\n", current->pid, minor);
|
|
|
|
priv = drm_alloc(sizeof(*priv), DRM_MEM_FILES);
|
|
memset(priv, 0, sizeof(*priv));
|
|
filp->private_data = priv;
|
|
priv->uid = current->euid;
|
|
priv->pid = current->pid;
|
|
priv->minor = minor;
|
|
priv->dev = dev;
|
|
priv->ioctl_count = 0;
|
|
priv->authenticated = capable(CAP_SYS_ADMIN);
|
|
|
|
down(&dev->struct_sem);
|
|
if (!dev->file_last) {
|
|
priv->next = NULL;
|
|
priv->prev = NULL;
|
|
dev->file_first = priv;
|
|
dev->file_last = priv;
|
|
} else {
|
|
priv->next = NULL;
|
|
priv->prev = dev->file_last;
|
|
dev->file_last->next = priv;
|
|
dev->file_last = priv;
|
|
}
|
|
up(&dev->struct_sem);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int drm_flush(struct file *filp)
|
|
{
|
|
drm_file_t *priv = filp->private_data;
|
|
drm_device_t *dev = priv->dev;
|
|
|
|
DRM_DEBUG("pid = %d, device = 0x%x, open_count = %d\n",
|
|
current->pid, dev->device, dev->open_count);
|
|
return 0;
|
|
}
|
|
|
|
/* drm_release is called whenever a process closes /dev/drm*. Linux calls
|
|
this only if any mappings have been closed. */
|
|
|
|
int drm_release(struct inode *inode, struct file *filp)
|
|
{
|
|
drm_file_t *priv = filp->private_data;
|
|
drm_device_t *dev = priv->dev;
|
|
|
|
DRM_DEBUG("pid = %d, device = 0x%x, open_count = %d\n",
|
|
current->pid, dev->device, dev->open_count);
|
|
|
|
if (_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)
|
|
&& dev->lock.pid == current->pid) {
|
|
DRM_ERROR("Process %d dead, freeing lock for context %d\n",
|
|
current->pid,
|
|
_DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
|
|
drm_lock_free(dev,
|
|
&dev->lock.hw_lock->lock,
|
|
_DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
|
|
|
|
/* FIXME: may require heavy-handed reset of
|
|
hardware at this point, possibly
|
|
processed via a callback to the X
|
|
server. */
|
|
}
|
|
drm_reclaim_buffers(dev, priv->pid);
|
|
|
|
drm_fasync(-1, filp, 0);
|
|
|
|
down(&dev->struct_sem);
|
|
if (priv->prev) priv->prev->next = priv->next;
|
|
else dev->file_first = priv->next;
|
|
if (priv->next) priv->next->prev = priv->prev;
|
|
else dev->file_last = priv->prev;
|
|
up(&dev->struct_sem);
|
|
|
|
drm_free(priv, sizeof(*priv), DRM_MEM_FILES);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int drm_fasync(int fd, struct file *filp, int on)
|
|
{
|
|
drm_file_t *priv = filp->private_data;
|
|
drm_device_t *dev = priv->dev;
|
|
int retcode;
|
|
|
|
DRM_DEBUG("fd = %d, device = 0x%x\n", fd, dev->device);
|
|
retcode = fasync_helper(fd, filp, on, &dev->buf_async);
|
|
if (retcode < 0) return retcode;
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* The drm_read and drm_write_string code (especially that which manages
|
|
the circular buffer), is based on Alessandro Rubini's LINUX DEVICE
|
|
DRIVERS (Cambridge: O'Reilly, 1998), pages 111-113. */
|
|
|
|
ssize_t drm_read(struct file *filp, char *buf, size_t count, loff_t *off)
|
|
{
|
|
drm_file_t *priv = filp->private_data;
|
|
drm_device_t *dev = priv->dev;
|
|
int left;
|
|
int avail;
|
|
int send;
|
|
int cur;
|
|
|
|
DRM_DEBUG("%p, %p\n", dev->buf_rp, dev->buf_wp);
|
|
|
|
while (dev->buf_rp == dev->buf_wp) {
|
|
DRM_DEBUG(" sleeping\n");
|
|
if (filp->f_flags & O_NONBLOCK) {
|
|
return -EAGAIN;
|
|
}
|
|
interruptible_sleep_on(&dev->buf_readers);
|
|
if (signal_pending(current)) {
|
|
DRM_DEBUG(" interrupted\n");
|
|
return -ERESTARTSYS;
|
|
}
|
|
DRM_DEBUG(" awake\n");
|
|
}
|
|
|
|
left = (dev->buf_rp + DRM_BSZ - dev->buf_wp) % DRM_BSZ;
|
|
avail = DRM_BSZ - left;
|
|
send = DRM_MIN(avail, count);
|
|
|
|
while (send) {
|
|
if (dev->buf_wp > dev->buf_rp) {
|
|
cur = DRM_MIN(send, dev->buf_wp - dev->buf_rp);
|
|
} else {
|
|
cur = DRM_MIN(send, dev->buf_end - dev->buf_rp);
|
|
}
|
|
copy_to_user_ret(buf, dev->buf_rp, cur, -EINVAL);
|
|
dev->buf_rp += cur;
|
|
if (dev->buf_rp == dev->buf_end) dev->buf_rp = dev->buf;
|
|
send -= cur;
|
|
}
|
|
|
|
wake_up_interruptible(&dev->buf_writers);
|
|
return DRM_MIN(avail, count);;
|
|
}
|
|
|
|
int drm_write_string(drm_device_t *dev, const char *s)
|
|
{
|
|
int left = (dev->buf_rp + DRM_BSZ - dev->buf_wp) % DRM_BSZ;
|
|
int send = strlen(s);
|
|
int count;
|
|
|
|
DRM_DEBUG("%d left, %d to send (%p, %p)\n",
|
|
left, send, dev->buf_rp, dev->buf_wp);
|
|
|
|
if (left == 1 || dev->buf_wp != dev->buf_rp) {
|
|
DRM_ERROR("Buffer not empty (%d left, wp = %p, rp = %p)\n",
|
|
left,
|
|
dev->buf_wp,
|
|
dev->buf_rp);
|
|
}
|
|
|
|
while (send) {
|
|
if (dev->buf_wp >= dev->buf_rp) {
|
|
count = DRM_MIN(send, dev->buf_end - dev->buf_wp);
|
|
if (count == left) --count; /* Leave a hole */
|
|
} else {
|
|
count = DRM_MIN(send, dev->buf_rp - dev->buf_wp - 1);
|
|
}
|
|
strncpy(dev->buf_wp, s, count);
|
|
dev->buf_wp += count;
|
|
if (dev->buf_wp == dev->buf_end) dev->buf_wp = dev->buf;
|
|
send -= count;
|
|
}
|
|
|
|
#if LINUX_VERSION_CODE < 0x020315
|
|
if (dev->buf_async) kill_fasync(dev->buf_async, SIGIO);
|
|
#else
|
|
/* Parameter added in 2.3.21 */
|
|
if (dev->buf_async) kill_fasync(dev->buf_async, SIGIO, POLL_IN);
|
|
#endif
|
|
DRM_DEBUG("waking\n");
|
|
wake_up_interruptible(&dev->buf_readers);
|
|
return 0;
|
|
}
|