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/* fops.c -- File operations for DRM -*- c -*-
* Created: Mon Jan 4 08:58:31 1999 by faith@precisioninsight.com
* Revised: Tue Oct 12 08:48:59 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"
#include <sys/signalvar.h>
#include <sys/poll.h>
drm_file_t *drm_find_file_by_proc(drm_device_t *dev, struct proc *p)
{
uid_t uid = p->p_cred->p_svuid;
pid_t pid = p->p_pid;
drm_file_t *priv;
TAILQ_FOREACH(priv, &dev->files, link)
if (priv->pid == pid && priv->uid == uid)
return priv;
return NULL;
}
/* drm_open is called whenever a process opens /dev/drm. */
int drm_open_helper(dev_t kdev, int flags, int fmt, struct proc *p,
drm_device_t *dev)
{
int m = minor(kdev);
drm_file_t *priv;
if (flags & O_EXCL)
return EBUSY; /* No exclusive opens */
dev->flags = flags;
DRM_DEBUG("pid = %d, device = %p, minor = %d\n",
p->p_pid, dev->device, m);
priv = drm_find_file_by_proc(dev, p);
if (priv) {
priv->refs++;
} else {
priv = drm_alloc(sizeof(*priv), DRM_MEM_FILES);
memset(priv, 0, sizeof(*priv));
priv->uid = p->p_cred->p_svuid;
priv->pid = p->p_pid;
priv->refs = 1;
priv->minor = m;
priv->devXX = dev;
priv->ioctl_count = 0;
priv->authenticated = !suser(p);
lockmgr(&dev->dev_lock, LK_EXCLUSIVE, 0, p);
TAILQ_INSERT_TAIL(&dev->files, priv, link);
lockmgr(&dev->dev_lock, LK_RELEASE, 0, p);
}
kdev->si_drv1 = dev;
return 0;
}
int drm_write(dev_t kdev, struct uio *uio, int ioflag)
{
struct proc *p = curproc;
drm_device_t *dev = kdev->si_drv1;
DRM_DEBUG("pid = %d, device = %p, open_count = %d\n",
p->p_pid, dev->device, dev->open_count);
return 0;
}
/* drm_release is called whenever a process closes /dev/drm*. */
int drm_close(dev_t kdev, int fflag, int devtype, struct proc *p)
{
drm_device_t *dev = kdev->si_drv1;
drm_file_t *priv;
DRM_DEBUG("pid = %d, device = %p, open_count = %d\n",
p->p_pid, dev->device, dev->open_count);
priv = drm_find_file_by_proc(dev, p);
if (!priv) {
DRM_DEBUG("can't find authenticator\n");
return EINVAL;
}
if (dev->lock.hw_lock && _DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)
&& dev->lock.pid == p->p_pid) {
DRM_ERROR("Process %d dead, freeing lock for context %d\n",
p->p_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);
funsetown(dev->buf_sigio);
lockmgr(&dev->dev_lock, LK_EXCLUSIVE, 0, p);
priv = drm_find_file_by_proc(dev, p);
if (priv) {
priv->refs--;
if (!priv->refs) {
TAILQ_REMOVE(&dev->files, priv, link);
drm_free(priv, sizeof(*priv), DRM_MEM_FILES);
}
}
lockmgr(&dev->dev_lock, LK_RELEASE, 0, p);
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(dev_t kdev, struct uio *uio, int ioflag)
{
drm_device_t *dev = kdev->si_drv1;
int left;
int avail;
int send;
int cur;
int error = 0;
DRM_DEBUG("%p, %p\n", dev->buf_rp, dev->buf_wp);
while (dev->buf_rp == dev->buf_wp) {
DRM_DEBUG(" sleeping\n");
if (dev->flags & FASYNC) {
return EWOULDBLOCK;
}
error = tsleep(&dev->buf_rp, PZERO|PCATCH, "drmrd", 0);
if (error) {
DRM_DEBUG(" interrupted\n");
return error;
}
DRM_DEBUG(" awake\n");
}
left = (dev->buf_rp + DRM_BSZ - dev->buf_wp) % DRM_BSZ;
avail = DRM_BSZ - left;
send = DRM_MIN(avail, uio->uio_resid);
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);
}
error = uiomove(dev->buf_rp, cur, uio);
if (error)
break;
dev->buf_rp += cur;
if (dev->buf_rp == dev->buf_end) dev->buf_rp = dev->buf;
send -= cur;
}
wakeup(&dev->buf_wp);
return error;
}
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 (dev->buf_selecting) {
dev->buf_selecting = 0;
selwakeup(&dev->buf_sel);
}
DRM_DEBUG("dev->buf_sigio=%p\n", dev->buf_sigio);
if (dev->buf_sigio) {
DRM_DEBUG("dev->buf_sigio->sio_pgid=%d\n", dev->buf_sigio->sio_pgid);
pgsigio(dev->buf_sigio, SIGIO, 0);
}
DRM_DEBUG("waking\n");
wakeup(&dev->buf_rp);
return 0;
}
int drm_poll(dev_t kdev, int events, struct proc *p)
{
drm_device_t *dev = kdev->si_drv1;
int s;
int revents = 0;
s = spldrm();
if (events & (POLLIN | POLLRDNORM)) {
int left = (dev->buf_rp + DRM_BSZ - dev->buf_wp) % DRM_BSZ;
if (left > 0)
revents |= events & (POLLIN | POLLRDNORM);
else
selrecord(p, &dev->buf_sel);
}
splx(s);
return revents;
}
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