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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>
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/** @file drm_fops.c
* Support code for dealing with the file privates associated with each
* open of the DRM device.
*/
#include <dev/drm2/drmP.h>
/* drm_open_helper is called whenever a process opens /dev/drm. */
int drm_open_helper(struct cdev *kdev, int flags, int fmt, DRM_STRUCTPROC *p,
struct drm_device *dev)
{
struct drm_file *priv;
int retcode;
if (flags & O_EXCL)
return EBUSY; /* No exclusive opens */
dev->flags = flags;
DRM_DEBUG("pid = %d, device = %s\n", DRM_CURRENTPID, devtoname(kdev));
priv = malloc(sizeof(*priv), DRM_MEM_FILES, M_NOWAIT | M_ZERO);
if (priv == NULL) {
return ENOMEM;
}
DRM_LOCK(dev);
priv->dev = dev;
priv->uid = p->td_ucred->cr_svuid;
priv->pid = p->td_proc->p_pid;
priv->ioctl_count = 0;
/* for compatibility root is always authenticated */
priv->authenticated = DRM_SUSER(p);
INIT_LIST_HEAD(&priv->fbs);
INIT_LIST_HEAD(&priv->event_list);
priv->event_space = 4096; /* set aside 4k for event buffer */
if (dev->driver->driver_features & DRIVER_GEM)
drm_gem_open(dev, priv);
if (dev->driver->open) {
/* shared code returns -errno */
retcode = -dev->driver->open(dev, priv);
if (retcode != 0) {
free(priv, DRM_MEM_FILES);
DRM_UNLOCK(dev);
return retcode;
}
}
/* first opener automatically becomes master */
priv->master = TAILQ_EMPTY(&dev->files);
TAILQ_INSERT_TAIL(&dev->files, priv, link);
DRM_UNLOCK(dev);
kdev->si_drv1 = dev;
retcode = devfs_set_cdevpriv(priv, drm_close);
if (retcode != 0)
drm_close(priv);
return (retcode);
}
static bool
drm_dequeue_event(struct drm_device *dev, struct drm_file *file_priv,
struct uio *uio, struct drm_pending_event **out)
{
struct drm_pending_event *e;
if (list_empty(&file_priv->event_list))
return (false);
e = list_first_entry(&file_priv->event_list,
struct drm_pending_event, link);
if (e->event->length > uio->uio_resid)
return (false);
file_priv->event_space += e->event->length;
list_del(&e->link);
*out = e;
return (true);
}
int
drm_read(struct cdev *kdev, struct uio *uio, int ioflag)
{
struct drm_file *file_priv;
struct drm_device *dev;
struct drm_pending_event *e;
int error;
error = devfs_get_cdevpriv((void **)&file_priv);
if (error != 0) {
DRM_ERROR("can't find authenticator\n");
return (EINVAL);
}
dev = drm_get_device_from_kdev(kdev);
mtx_lock(&dev->event_lock);
while (list_empty(&file_priv->event_list)) {
if ((ioflag & O_NONBLOCK) != 0) {
error = EAGAIN;
goto out;
}
error = msleep(&file_priv->event_space, &dev->event_lock,
PCATCH, "drmrea", 0);
if (error != 0)
goto out;
}
while (drm_dequeue_event(dev, file_priv, uio, &e)) {
mtx_unlock(&dev->event_lock);
error = uiomove(e->event, e->event->length, uio);
CTR3(KTR_DRM, "drm_event_dequeued %d %d %d", curproc->p_pid,
e->event->type, e->event->length);
e->destroy(e);
if (error != 0)
return (error);
mtx_lock(&dev->event_lock);
}
out:
mtx_unlock(&dev->event_lock);
return (error);
}
void
drm_event_wakeup(struct drm_pending_event *e)
{
struct drm_file *file_priv;
struct drm_device *dev;
file_priv = e->file_priv;
dev = file_priv->dev;
mtx_assert(&dev->event_lock, MA_OWNED);
wakeup(&file_priv->event_space);
selwakeup(&file_priv->event_poll);
}
int
drm_poll(struct cdev *kdev, int events, struct thread *td)
{
struct drm_file *file_priv;
struct drm_device *dev;
int error, revents;
error = devfs_get_cdevpriv((void **)&file_priv);
if (error != 0) {
DRM_ERROR("can't find authenticator\n");
return (EINVAL);
}
dev = drm_get_device_from_kdev(kdev);
revents = 0;
mtx_lock(&dev->event_lock);
if ((events & (POLLIN | POLLRDNORM)) != 0) {
if (list_empty(&file_priv->event_list)) {
CTR0(KTR_DRM, "drm_poll empty list");
selrecord(td, &file_priv->event_poll);
} else {
revents |= events & (POLLIN | POLLRDNORM);
CTR1(KTR_DRM, "drm_poll revents %x", revents);
}
}
mtx_unlock(&dev->event_lock);
return (revents);
}
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