freebsd-dev/sys/dev/drm2/drm_fops.c
Adrian Chadd 280bcab3d0 drm2: a few minor fixes after r280183
* Remove obsolete drm_agp_*_memory() prototypes.
* Fix comment in drm_fops.c (outisde -> outside).
* Fix some formatting issues in drm_stub.c (spaces -> tabs).
* Add missing case statement (gen == 3) in intel_gpu_reset().
* Restore pci_enable_busmaster() call in the init path (fixes gpu hang on i945GM).
* Replace M_WAITOK with M_NOWAIT when the return value of malloc is checked (may be incorrect).

Submitted by:	<s3erios@gmail.com>
Reviewed by:	dumbbell
Approved by:	dumbbell
Differential Revision:	https://reviews.freebsd.org/D3413
2015-10-04 07:45:36 +00:00

604 lines
15 KiB
C

/**
* \file drm_fops.c
* File operations for DRM
*
* \author Rickard E. (Rik) Faith <faith@valinux.com>
* \author Daryll Strauss <daryll@valinux.com>
* \author Gareth Hughes <gareth@valinux.com>
*/
/*
* Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
*
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <dev/drm2/drmP.h>
static int drm_open_helper(struct cdev *kdev, int flags, int fmt,
DRM_STRUCTPROC *p, struct drm_device *dev);
static int drm_setup(struct drm_device * dev)
{
int i;
int ret;
if (dev->driver->firstopen) {
ret = dev->driver->firstopen(dev);
if (ret != 0)
return ret;
}
atomic_set(&dev->ioctl_count, 0);
atomic_set(&dev->vma_count, 0);
if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
!drm_core_check_feature(dev, DRIVER_MODESET)) {
dev->buf_use = 0;
atomic_set(&dev->buf_alloc, 0);
i = drm_dma_setup(dev);
if (i < 0)
return i;
}
/*
* FIXME Linux<->FreeBSD: counter incremented in drm_open() and
* reset to 0 here.
*/
#if 0
for (i = 0; i < ARRAY_SIZE(dev->counts); i++)
atomic_set(&dev->counts[i], 0);
#endif
dev->sigdata.lock = NULL;
dev->context_flag = 0;
dev->interrupt_flag = 0;
dev->dma_flag = 0;
dev->last_context = 0;
dev->last_switch = 0;
dev->last_checked = 0;
DRM_INIT_WAITQUEUE(&dev->context_wait);
dev->if_version = 0;
#ifdef FREEBSD_NOTYET
dev->ctx_start = 0;
dev->lck_start = 0;
dev->buf_async = NULL;
DRM_INIT_WAITQUEUE(&dev->buf_readers);
DRM_INIT_WAITQUEUE(&dev->buf_writers);
#endif /* FREEBSD_NOTYET */
DRM_DEBUG("\n");
/*
* The kernel's context could be created here, but is now created
* in drm_dma_enqueue. This is more resource-efficient for
* hardware that does not do DMA, but may mean that
* drm_select_queue fails between the time the interrupt is
* initialized and the time the queues are initialized.
*/
return 0;
}
/**
* Open file.
*
* \param inode device inode
* \param filp file pointer.
* \return zero on success or a negative number on failure.
*
* Searches the DRM device with the same minor number, calls open_helper(), and
* increments the device open count. If the open count was previous at zero,
* i.e., it's the first that the device is open, then calls setup().
*/
int drm_open(struct cdev *kdev, int flags, int fmt, DRM_STRUCTPROC *p)
{
struct drm_device *dev = NULL;
struct drm_minor *minor;
int retcode = 0;
int need_setup = 0;
minor = kdev->si_drv1;
if (!minor)
return ENODEV;
if (!(dev = minor->dev))
return ENODEV;
sx_xlock(&drm_global_mutex);
/*
* FIXME Linux<->FreeBSD: On Linux, counter updated outside
* global mutex.
*/
if (!dev->open_count++)
need_setup = 1;
retcode = drm_open_helper(kdev, flags, fmt, p, dev);
if (retcode) {
sx_xunlock(&drm_global_mutex);
return (-retcode);
}
atomic_inc(&dev->counts[_DRM_STAT_OPENS]);
if (need_setup) {
retcode = drm_setup(dev);
if (retcode)
goto err_undo;
}
sx_xunlock(&drm_global_mutex);
return 0;
err_undo:
mtx_lock(&Giant); /* FIXME: Giant required? */
device_unbusy(dev->dev);
mtx_unlock(&Giant);
dev->open_count--;
sx_xunlock(&drm_global_mutex);
return -retcode;
}
EXPORT_SYMBOL(drm_open);
/**
* Called whenever a process opens /dev/drm.
*
* \param inode device inode.
* \param filp file pointer.
* \param dev device.
* \return zero on success or a negative number on failure.
*
* Creates and initializes a drm_file structure for the file private data in \p
* filp and add it into the double linked list in \p dev.
*/
static int drm_open_helper(struct cdev *kdev, int flags, int fmt,
DRM_STRUCTPROC *p, struct drm_device *dev)
{
struct drm_file *priv;
int ret;
if (flags & O_EXCL)
return -EBUSY; /* No exclusive opens */
if (dev->switch_power_state != DRM_SWITCH_POWER_ON)
return -EINVAL;
DRM_DEBUG("pid = %d, device = %s\n", DRM_CURRENTPID, devtoname(kdev));
priv = malloc(sizeof(*priv), DRM_MEM_FILES, M_NOWAIT | M_ZERO);
if (!priv)
return -ENOMEM;
priv->uid = p->td_ucred->cr_svuid;
priv->pid = p->td_proc->p_pid;
priv->minor = kdev->si_drv1;
priv->ioctl_count = 0;
/* for compatibility root is always authenticated */
priv->authenticated = DRM_SUSER(p);
priv->lock_count = 0;
INIT_LIST_HEAD(&priv->lhead);
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);
#ifdef FREEBSD_NOTYET
if (drm_core_check_feature(dev, DRIVER_PRIME))
drm_prime_init_file_private(&priv->prime);
#endif /* FREEBSD_NOTYET */
if (dev->driver->open) {
ret = dev->driver->open(dev, priv);
if (ret < 0)
goto out_free;
}
/* if there is no current master make this fd it */
DRM_LOCK(dev);
if (!priv->minor->master) {
/* create a new master */
priv->minor->master = drm_master_create(priv->minor);
if (!priv->minor->master) {
DRM_UNLOCK(dev);
ret = -ENOMEM;
goto out_free;
}
priv->is_master = 1;
/* take another reference for the copy in the local file priv */
priv->master = drm_master_get(priv->minor->master);
priv->authenticated = 1;
DRM_UNLOCK(dev);
if (dev->driver->master_create) {
ret = dev->driver->master_create(dev, priv->master);
if (ret) {
DRM_LOCK(dev);
/* drop both references if this fails */
drm_master_put(&priv->minor->master);
drm_master_put(&priv->master);
DRM_UNLOCK(dev);
goto out_free;
}
}
DRM_LOCK(dev);
if (dev->driver->master_set) {
ret = dev->driver->master_set(dev, priv, true);
if (ret) {
/* drop both references if this fails */
drm_master_put(&priv->minor->master);
drm_master_put(&priv->master);
DRM_UNLOCK(dev);
goto out_free;
}
}
DRM_UNLOCK(dev);
} else {
/* get a reference to the master */
priv->master = drm_master_get(priv->minor->master);
DRM_UNLOCK(dev);
}
DRM_LOCK(dev);
list_add(&priv->lhead, &dev->filelist);
DRM_UNLOCK(dev);
mtx_lock(&Giant); /* FIXME: Giant required? */
device_busy(dev->dev);
mtx_unlock(&Giant);
ret = devfs_set_cdevpriv(priv, drm_release);
if (ret != 0)
drm_release(priv);
return ret;
out_free:
free(priv, DRM_MEM_FILES);
return ret;
}
static void drm_master_release(struct drm_device *dev, struct drm_file *file_priv)
{
if (drm_i_have_hw_lock(dev, file_priv)) {
DRM_DEBUG("File %p released, freeing lock for context %d\n",
file_priv, _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
drm_lock_free(&file_priv->master->lock,
_DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
}
}
static void drm_events_release(struct drm_file *file_priv)
{
struct drm_device *dev = file_priv->minor->dev;
struct drm_pending_event *e, *et;
struct drm_pending_vblank_event *v, *vt;
unsigned long flags;
DRM_SPINLOCK_IRQSAVE(&dev->event_lock, flags);
/* Remove pending flips */
list_for_each_entry_safe(v, vt, &dev->vblank_event_list, base.link)
if (v->base.file_priv == file_priv) {
list_del(&v->base.link);
drm_vblank_put(dev, v->pipe);
v->base.destroy(&v->base);
}
/* Remove unconsumed events */
list_for_each_entry_safe(e, et, &file_priv->event_list, link)
e->destroy(e);
DRM_SPINUNLOCK_IRQRESTORE(&dev->event_lock, flags);
}
/**
* Release file.
*
* \param inode device inode
* \param file_priv DRM file private.
* \return zero on success or a negative number on failure.
*
* If the hardware lock is held then free it, and take it again for the kernel
* context since it's necessary to reclaim buffers. Unlink the file private
* data from its list and free it. Decreases the open count and if it reaches
* zero calls drm_lastclose().
*/
void drm_release(void *data)
{
struct drm_file *file_priv = data;
struct drm_device *dev = file_priv->minor->dev;
sx_xlock(&drm_global_mutex);
DRM_DEBUG("open_count = %d\n", dev->open_count);
if (dev->driver->preclose)
dev->driver->preclose(dev, file_priv);
/* ========================================================
* Begin inline drm_release
*/
DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
DRM_CURRENTPID,
(long)file_priv->minor->device,
dev->open_count);
/* Release any auth tokens that might point to this file_priv,
(do that under the drm_global_mutex) */
if (file_priv->magic)
(void) drm_remove_magic(file_priv->master, file_priv->magic);
/* if the master has gone away we can't do anything with the lock */
if (file_priv->minor->master)
drm_master_release(dev, file_priv);
if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
drm_core_reclaim_buffers(dev, file_priv);
drm_events_release(file_priv);
seldrain(&file_priv->event_poll);
if (dev->driver->driver_features & DRIVER_MODESET)
drm_fb_release(file_priv);
if (dev->driver->driver_features & DRIVER_GEM)
drm_gem_release(dev, file_priv);
#ifdef FREEBSD_NOTYET
mutex_lock(&dev->ctxlist_mutex);
if (!list_empty(&dev->ctxlist)) {
struct drm_ctx_list *pos, *n;
list_for_each_entry_safe(pos, n, &dev->ctxlist, head) {
if (pos->tag == file_priv &&
pos->handle != DRM_KERNEL_CONTEXT) {
if (dev->driver->context_dtor)
dev->driver->context_dtor(dev,
pos->handle);
drm_ctxbitmap_free(dev, pos->handle);
list_del(&pos->head);
kfree(pos);
--dev->ctx_count;
}
}
}
mutex_unlock(&dev->ctxlist_mutex);
#endif /* FREEBSD_NOTYET */
DRM_LOCK(dev);
if (file_priv->is_master) {
struct drm_master *master = file_priv->master;
struct drm_file *temp;
list_for_each_entry(temp, &dev->filelist, lhead) {
if ((temp->master == file_priv->master) &&
(temp != file_priv))
temp->authenticated = 0;
}
/**
* Since the master is disappearing, so is the
* possibility to lock.
*/
if (master->lock.hw_lock) {
if (dev->sigdata.lock == master->lock.hw_lock)
dev->sigdata.lock = NULL;
master->lock.hw_lock = NULL;
master->lock.file_priv = NULL;
DRM_WAKEUP_INT(&master->lock.lock_queue);
}
if (file_priv->minor->master == file_priv->master) {
/* drop the reference held my the minor */
if (dev->driver->master_drop)
dev->driver->master_drop(dev, file_priv, true);
drm_master_put(&file_priv->minor->master);
}
}
/* drop the reference held my the file priv */
drm_master_put(&file_priv->master);
file_priv->is_master = 0;
list_del(&file_priv->lhead);
DRM_UNLOCK(dev);
if (dev->driver->postclose)
dev->driver->postclose(dev, file_priv);
#ifdef FREEBSD_NOTYET
if (drm_core_check_feature(dev, DRIVER_PRIME))
drm_prime_destroy_file_private(&file_priv->prime);
#endif /* FREEBSD_NOTYET */
free(file_priv, DRM_MEM_FILES);
/* ========================================================
* End inline drm_release
*/
atomic_inc(&dev->counts[_DRM_STAT_CLOSES]);
mtx_lock(&Giant);
device_unbusy(dev->dev);
mtx_unlock(&Giant);
if (!--dev->open_count) {
if (atomic_read(&dev->ioctl_count)) {
DRM_ERROR("Device busy: %d\n",
atomic_read(&dev->ioctl_count));
} else
drm_lastclose(dev);
}
sx_xunlock(&drm_global_mutex);
}
EXPORT_SYMBOL(drm_release);
static bool
drm_dequeue_event(struct drm_file *file_priv, struct uio *uio,
struct drm_pending_event **out)
{
struct drm_pending_event *e;
bool ret = false;
/* Already locked in drm_read(). */
/* DRM_SPINLOCK_IRQSAVE(&dev->event_lock, flags); */
*out = NULL;
if (list_empty(&file_priv->event_list))
goto out;
e = list_first_entry(&file_priv->event_list,
struct drm_pending_event, link);
if (e->event->length > uio->uio_resid)
goto out;
file_priv->event_space += e->event->length;
list_del(&e->link);
*out = e;
ret = true;
out:
/* DRM_SPINUNLOCK_IRQRESTORE(&dev->event_lock, flags); */
return ret;
}
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;
ssize_t 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(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);
}
EXPORT_SYMBOL(drm_read);
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->minor->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);
}
EXPORT_SYMBOL(drm_poll);
int
drm_mmap_single(struct cdev *kdev, vm_ooffset_t *offset, vm_size_t size,
struct vm_object **obj_res, int nprot)
{
struct drm_device *dev;
dev = drm_get_device_from_kdev(kdev);
if (dev->drm_ttm_bdev != NULL) {
return (-ttm_bo_mmap_single(dev->drm_ttm_bdev, offset, size,
obj_res, nprot));
} else if ((dev->driver->driver_features & DRIVER_GEM) != 0) {
return (-drm_gem_mmap_single(dev, offset, size, obj_res, nprot));
} else {
return (ENODEV);
}
}