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/*-
* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
* 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
* VA LINUX SYSTEMS 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.
*
* Authors:
* Rickard E. (Rik) Faith <faith@valinux.com>
* Daryll Strauss <daryll@valinux.com>
* Gareth Hughes <gareth@valinux.com>
*
*/
/** @file drm_fops.c
* Support code for dealing with the file privates associated with each
* open of the DRM device.
*/
#include "drmP.h"
#ifdef __OpenBSD__
drm_file_t *
drm_find_file_by_minor(struct drm_device *dev, int minor)
{
drm_file_t *priv;
DRM_SPINLOCK_ASSERT(&dev->dev_lock);
TAILQ_FOREACH(priv, &dev->files, link)
if (priv->minor == minor)
return (priv);
return (NULL);
}
#else
drm_file_t *
drm_find_file_by_proc(drm_device_t *dev, DRM_STRUCTPROC *p)
{
uid_t uid = DRM_UID(p);
pid_t pid = DRM_PID(p);
drm_file_t *priv;
DRM_SPINLOCK_ASSERT(&dev->dev_lock);
TAILQ_FOREACH(priv, &dev->files, link)
if (priv->pid == pid && priv->uid == uid)
return priv;
return NULL;
}
#endif
/* drm_open_helper is called whenever a process opens /dev/drm. */
int
drm_open_helper(DRM_CDEV kdev, int flags, int fmt, DRM_STRUCTPROC *p,
drm_device_t *dev)
{
drm_file_t *priv;
int m, retcode;
m = minor(kdev);
if (flags & O_EXCL)
return EBUSY; /* No exclusive opens */
dev->flags = flags;
DRM_DEBUG("pid = %d, minor = %d\n", DRM_CURRENTPID, m);
DRM_LOCK();
#ifdef __OpenBSD__
priv = drm_find_file_by_minor(dev, m);
#else
priv = drm_find_file_by_proc(dev, p);
#endif
if (priv) {
priv->refs++;
} else {
priv = malloc(sizeof(*priv), M_DRM, M_NOWAIT | M_ZERO);
if (priv == NULL) {
DRM_UNLOCK();
return ENOMEM;
}
priv->uid = DRM_UID(p);
priv->pid = DRM_PID(p);
priv->refs = 1;
priv->minor = m;
priv->ioctl_count = 0;
/* for compatibility root is always authenticated */
priv->authenticated = DRM_SUSER(p);
if (dev->driver.open) {
/* shared code returns -errno */
retcode = -dev->driver.open(dev, priv);
if (retcode != 0) {
free(priv, M_DRM);
DRM_UNLOCK();
return retcode;
}
}
/* first opener automatically becomes master if root */
#ifdef __OpenBSD__
if (TAILQ_EMPTY(&dev->files) && !DRM_SUSER(p)) {
free(priv, M_DRM);
DRM_UNLOCK();
return (EPERM);
}
#endif
priv->master = TAILQ_EMPTY(&dev->files);
TAILQ_INSERT_TAIL(&dev->files, priv, link);
}
DRM_UNLOCK();
#ifdef __FreeBSD__
kdev->si_drv1 = dev;
#endif
return 0;
}
/* The drm_read and drm_poll are stubs to prevent spurious errors
* on older X Servers (4.3.0 and earlier) */
int
drm_read(DRM_CDEV kdev, struct uio *uio, int ioflag)
{
return 0;
}
int
drm_poll(DRM_CDEV kdev, int events, DRM_STRUCTPROC *p)
{
return 0;
}
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