246 lines
6.5 KiB
C
246 lines
6.5 KiB
C
/* drm_fops.h -- File operations for DRM -*- linux-c -*-
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* Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
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*
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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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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* VA LINUX SYSTEMS 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
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Rickard E. (Rik) Faith <faith@valinux.com>
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* Daryll Strauss <daryll@valinux.com>
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* Gareth Hughes <gareth@valinux.com>
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*
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* $FreeBSD: src/sys/dev/drm/drm_fops.h,v 1.5 2003/03/09 02:08:28 anholt Exp $
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*/
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#include "drmP.h"
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drm_file_t *DRM(find_file_by_proc)(drm_device_t *dev, DRM_STRUCTPROC *p)
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{
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#if __FreeBSD_version >= 500021
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uid_t uid = p->td_proc->p_ucred->cr_svuid;
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pid_t pid = p->td_proc->p_pid;
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#else
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uid_t uid = p->p_cred->p_svuid;
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pid_t pid = p->p_pid;
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#endif
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drm_file_t *priv;
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TAILQ_FOREACH(priv, &dev->files, link)
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if (priv->pid == pid && priv->uid == uid)
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return priv;
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return NULL;
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}
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/* DRM(open) is called whenever a process opens /dev/drm. */
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int DRM(open_helper)(dev_t kdev, int flags, int fmt, DRM_STRUCTPROC *p,
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drm_device_t *dev)
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{
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int m = minor(kdev);
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drm_file_t *priv;
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if (flags & O_EXCL)
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return EBUSY; /* No exclusive opens */
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dev->flags = flags;
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if (!DRM(cpu_valid)())
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return DRM_ERR(EINVAL);
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DRM_DEBUG("pid = %d, minor = %d\n", DRM_CURRENTPID, m);
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/* FIXME: linux mallocs and bzeros here */
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priv = (drm_file_t *) DRM(find_file_by_proc)(dev, p);
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if (priv) {
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priv->refs++;
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} else {
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priv = (drm_file_t *) DRM(alloc)(sizeof(*priv), DRM_MEM_FILES);
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bzero(priv, sizeof(*priv));
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#if __FreeBSD_version >= 500000
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priv->uid = p->td_proc->p_ucred->cr_svuid;
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priv->pid = p->td_proc->p_pid;
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#else
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priv->uid = p->p_cred->p_svuid;
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priv->pid = p->p_pid;
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#endif
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priv->refs = 1;
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priv->minor = m;
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priv->devXX = dev;
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priv->ioctl_count = 0;
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priv->authenticated = !DRM_SUSER(p);
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DRM_LOCK;
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TAILQ_INSERT_TAIL(&dev->files, priv, link);
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DRM_UNLOCK;
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}
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#ifdef __FreeBSD__
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kdev->si_drv1 = dev;
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#endif
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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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int DRM(read)(dev_t kdev, struct uio *uio, int ioflag)
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{
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DRM_DEVICE;
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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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int error = 0;
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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 (dev->flags & FASYNC)
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return EWOULDBLOCK;
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error = tsleep(&dev->buf_rp, PZERO|PCATCH, "drmrd", 0);
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if (error) {
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DRM_DEBUG(" interrupted\n");
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return error;
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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, uio->uio_resid);
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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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error = uiomove(dev->buf_rp, cur, uio);
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if (error)
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break;
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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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wakeup(&dev->buf_wp);
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return error;
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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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#ifdef __NetBSD__
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struct proc *p;
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#endif /* __NetBSD__ */
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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 (dev->buf_selecting) {
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dev->buf_selecting = 0;
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selwakeup(&dev->buf_sel);
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}
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#ifdef __FreeBSD__
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DRM_DEBUG("dev->buf_sigio=%p\n", dev->buf_sigio);
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if (dev->buf_sigio) {
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DRM_DEBUG("dev->buf_sigio->sio_pgid=%d\n", dev->buf_sigio->sio_pgid);
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#if __FreeBSD_version >= 500000
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pgsigio(&dev->buf_sigio, SIGIO, 0);
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#else
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pgsigio(dev->buf_sigio, SIGIO, 0);
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#endif /* __FreeBSD_version */
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}
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#endif /* __FreeBSD__ */
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#ifdef __NetBSD__
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if (dev->buf_pgid) {
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DRM_DEBUG("dev->buf_pgid=%d\n", dev->buf_pgid);
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if(dev->buf_pgid > 0)
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gsignal(dev->buf_pgid, SIGIO);
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else if(dev->buf_pgid && (p = pfind(-dev->buf_pgid)) != NULL)
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psignal(p, SIGIO);
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}
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#endif /* __NetBSD__ */
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DRM_DEBUG("waking\n");
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wakeup(&dev->buf_rp);
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return 0;
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}
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int DRM(poll)(dev_t kdev, int events, DRM_STRUCTPROC *p)
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{
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DRM_DEVICE;
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int s;
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int revents = 0;
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s = spldrm();
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if (events & (POLLIN | POLLRDNORM)) {
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int left = (dev->buf_rp + DRM_BSZ - dev->buf_wp) % DRM_BSZ;
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if (left > 0)
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revents |= events & (POLLIN | POLLRDNORM);
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else
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selrecord(p, &dev->buf_sel);
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}
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splx(s);
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return revents;
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}
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int DRM(write)(dev_t kdev, struct uio *uio, int ioflag)
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{
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#if DRM_DEBUG_CODE
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DRM_DEVICE;
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#endif
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#ifdef __FreeBSD__
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DRM_DEBUG("pid = %d, device = %p, open_count = %d\n",
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curproc->p_pid, dev->device, dev->open_count);
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#elif defined(__NetBSD__)
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DRM_DEBUG("pid = %d, device = %p, open_count = %d\n",
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curproc->p_pid, &dev->device, dev->open_count);
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#endif
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return 0;
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}
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