132 lines
3.5 KiB
C
132 lines
3.5 KiB
C
/*-
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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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*/
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/** @file drm_fops.c
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* Support code for dealing with the file privates associated with each
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* open of the DRM device.
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*/
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#include "drmP.h"
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drm_file_t *drm_find_file_by_proc(struct drm_device *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_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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DRM_SPINLOCK_ASSERT(&dev->dev_lock);
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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_helper is called whenever a process opens /dev/drm. */
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int drm_open_helper(struct cdev *kdev, int flags, int fmt, DRM_STRUCTPROC *p,
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struct drm_device *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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int retcode;
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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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DRM_DEBUG("pid = %d, minor = %d\n", DRM_CURRENTPID, m);
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DRM_LOCK();
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priv = 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 = malloc(sizeof(*priv), M_DRM, M_NOWAIT | M_ZERO);
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if (priv == NULL) {
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DRM_UNLOCK();
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return ENOMEM;
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}
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#if __FreeBSD_version >= 500000
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priv->uid = p->td_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->ioctl_count = 0;
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/* for compatibility root is always authenticated */
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priv->authenticated = DRM_SUSER(p);
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if (dev->driver->open) {
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/* shared code returns -errno */
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retcode = -dev->driver->open(dev, priv);
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if (retcode != 0) {
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free(priv, M_DRM);
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DRM_UNLOCK();
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return retcode;
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}
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}
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/* first opener automatically becomes master */
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priv->master = TAILQ_EMPTY(&dev->files);
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TAILQ_INSERT_TAIL(&dev->files, priv, link);
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}
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DRM_UNLOCK();
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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_poll are stubs to prevent spurious errors
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* on older X Servers (4.3.0 and earlier) */
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int drm_read(struct cdev *kdev, struct uio *uio, int ioflag)
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{
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return 0;
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}
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int drm_poll(struct cdev *kdev, int events, DRM_STRUCTPROC *p)
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{
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return 0;
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}
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