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/* 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;
}
unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait)
{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->dev;
poll_wait(filp, &dev->buf_readers, wait);
if (dev->buf_wp != dev->buf_rp) return POLLIN | POLLRDNORM;
return 0;
}
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