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-rw-r--r--bsd/drm/fops.c260
1 files changed, 260 insertions, 0 deletions
diff --git a/bsd/drm/fops.c b/bsd/drm/fops.c
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--- /dev/null
+++ b/bsd/drm/fops.c
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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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