diff options
Diffstat (limited to 'nx-X11/extras/drm/linux-core/drm_lock.c')
-rw-r--r-- | nx-X11/extras/drm/linux-core/drm_lock.c | 305 |
1 files changed, 0 insertions, 305 deletions
diff --git a/nx-X11/extras/drm/linux-core/drm_lock.c b/nx-X11/extras/drm/linux-core/drm_lock.c deleted file mode 100644 index 5557f30fa..000000000 --- a/nx-X11/extras/drm/linux-core/drm_lock.c +++ /dev/null @@ -1,305 +0,0 @@ -/** - * \file drm_lock.c - * IOCTLs for locking - * - * \author Rickard E. (Rik) Faith <faith@valinux.com> - * \author Gareth Hughes <gareth@valinux.com> - */ - -/* - * Created: Tue Feb 2 08:37:54 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 "drmP.h" - -static int drm_lock_transfer(drm_device_t * dev, - __volatile__ unsigned int *lock, unsigned int context); -static int drm_notifier(void *priv); - -/** - * Lock ioctl. - * - * \param inode device inode. - * \param filp file pointer. - * \param cmd command. - * \param arg user argument, pointing to a drm_lock structure. - * \return zero on success or negative number on failure. - * - * Add the current task to the lock wait queue, and attempt to take to lock. - */ -int drm_lock(struct inode *inode, struct file *filp, - unsigned int cmd, unsigned long arg) -{ - drm_file_t *priv = filp->private_data; - drm_device_t *dev = priv->head->dev; - DECLARE_WAITQUEUE(entry, current); - drm_lock_t lock; - int ret = 0; - - ++priv->lock_count; - - if (copy_from_user(&lock, (drm_lock_t __user *) arg, sizeof(lock))) - return -EFAULT; - - if (lock.context == DRM_KERNEL_CONTEXT) { - DRM_ERROR("Process %d using kernel context %d\n", - current->pid, lock.context); - return -EINVAL; - } - - DRM_DEBUG("%d (pid %d) requests lock (0x%08x), flags = 0x%08x\n", - lock.context, current->pid, - dev->lock.hw_lock->lock, lock.flags); - - if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE)) - if (lock.context < 0) - return -EINVAL; - - add_wait_queue(&dev->lock.lock_queue, &entry); - for (;;) { - current->state = TASK_INTERRUPTIBLE; - if (!dev->lock.hw_lock) { - /* Device has been unregistered */ - ret = -EINTR; - break; - } - if (drm_lock_take(&dev->lock.hw_lock->lock, lock.context)) { - dev->lock.filp = filp; - dev->lock.lock_time = jiffies; - atomic_inc(&dev->counts[_DRM_STAT_LOCKS]); - break; /* Got lock */ - } - - /* Contention */ - schedule(); - if (signal_pending(current)) { - ret = -ERESTARTSYS; - break; - } - } - current->state = TASK_RUNNING; - remove_wait_queue(&dev->lock.lock_queue, &entry); - - DRM_DEBUG( "%d %s\n", lock.context, ret ? "interrupted" : "has lock" ); - if (ret) return ret; - - sigemptyset(&dev->sigmask); - sigaddset(&dev->sigmask, SIGSTOP); - sigaddset(&dev->sigmask, SIGTSTP); - sigaddset(&dev->sigmask, SIGTTIN); - sigaddset(&dev->sigmask, SIGTTOU); - dev->sigdata.context = lock.context; - dev->sigdata.lock = dev->lock.hw_lock; - block_all_signals(drm_notifier, &dev->sigdata, &dev->sigmask); - - if (dev->driver->dma_ready && (lock.flags & _DRM_LOCK_READY)) - dev->driver->dma_ready(dev); - - if (dev->driver->dma_quiescent && (lock.flags & _DRM_LOCK_QUIESCENT)) { - if (dev->driver->dma_quiescent(dev)) { - DRM_DEBUG( "%d waiting for DMA quiescent\n", lock.context); - return DRM_ERR(EBUSY); - } - } - - if (dev->driver->kernel_context_switch - && dev->last_context != lock.context) { - dev->driver->kernel_context_switch(dev, dev->last_context, - lock.context); - } - - return 0; -} - -/** - * Unlock ioctl. - * - * \param inode device inode. - * \param filp file pointer. - * \param cmd command. - * \param arg user argument, pointing to a drm_lock structure. - * \return zero on success or negative number on failure. - * - * Transfer and free the lock. - */ -int drm_unlock(struct inode *inode, struct file *filp, - unsigned int cmd, unsigned long arg) -{ - drm_file_t *priv = filp->private_data; - drm_device_t *dev = priv->head->dev; - drm_lock_t lock; - - if (copy_from_user(&lock, (drm_lock_t __user *) arg, sizeof(lock))) - return -EFAULT; - - if (lock.context == DRM_KERNEL_CONTEXT) { - DRM_ERROR("Process %d using kernel context %d\n", - current->pid, lock.context); - return -EINVAL; - } - - atomic_inc(&dev->counts[_DRM_STAT_UNLOCKS]); - - if (dev->driver->kernel_context_switch_unlock) - dev->driver->kernel_context_switch_unlock(dev); - else { - drm_lock_transfer(dev, &dev->lock.hw_lock->lock, - DRM_KERNEL_CONTEXT); - - if (drm_lock_free(dev, &dev->lock.hw_lock->lock, - DRM_KERNEL_CONTEXT)) { - DRM_ERROR("\n"); - } - } - - unblock_all_signals(); - return 0; -} - -/** - * Take the heavyweight lock. - * - * \param lock lock pointer. - * \param context locking context. - * \return one if the lock is held, or zero otherwise. - * - * Attempt to mark the lock as held by the given context, via the \p cmpxchg instruction. - */ -int drm_lock_take(__volatile__ unsigned int *lock, unsigned int context) -{ - unsigned int old, new, prev; - - do { - old = *lock; - if (old & _DRM_LOCK_HELD) - new = old | _DRM_LOCK_CONT; - else - new = context | _DRM_LOCK_HELD; - prev = cmpxchg(lock, old, new); - } while (prev != old); - if (_DRM_LOCKING_CONTEXT(old) == context) { - if (old & _DRM_LOCK_HELD) { - if (context != DRM_KERNEL_CONTEXT) { - DRM_ERROR("%d holds heavyweight lock\n", - context); - } - return 0; - } - } - if (new == (context | _DRM_LOCK_HELD)) { - /* Have lock */ - return 1; - } - return 0; -} - -/** - * This takes a lock forcibly and hands it to context. Should ONLY be used - * inside *_unlock to give lock to kernel before calling *_dma_schedule. - * - * \param dev DRM device. - * \param lock lock pointer. - * \param context locking context. - * \return always one. - * - * Resets the lock file pointer. - * Marks the lock as held by the given context, via the \p cmpxchg instruction. - */ -static int drm_lock_transfer(drm_device_t * dev, - __volatile__ unsigned int *lock, unsigned int context) -{ - unsigned int old, new, prev; - - dev->lock.filp = NULL; - do { - old = *lock; - new = context | _DRM_LOCK_HELD; - prev = cmpxchg(lock, old, new); - } while (prev != old); - return 1; -} - -/** - * Free lock. - * - * \param dev DRM device. - * \param lock lock. - * \param context context. - * - * Resets the lock file pointer. - * Marks the lock as not held, via the \p cmpxchg instruction. Wakes any task - * waiting on the lock queue. - */ -int drm_lock_free(drm_device_t * dev, - __volatile__ unsigned int *lock, unsigned int context) -{ - unsigned int old, new, prev; - - dev->lock.filp = NULL; - do { - old = *lock; - new = 0; - prev = cmpxchg(lock, old, new); - } while (prev != old); - if (_DRM_LOCK_IS_HELD(old) && _DRM_LOCKING_CONTEXT(old) != context) { - DRM_ERROR("%d freed heavyweight lock held by %d\n", - context, _DRM_LOCKING_CONTEXT(old)); - return 1; - } - wake_up_interruptible(&dev->lock.lock_queue); - return 0; -} - -/** - * If we get here, it means that the process has called DRM_IOCTL_LOCK - * without calling DRM_IOCTL_UNLOCK. - * - * If the lock is not held, then let the signal proceed as usual. If the lock - * is held, then set the contended flag and keep the signal blocked. - * - * \param priv pointer to a drm_sigdata structure. - * \return one if the signal should be delivered normally, or zero if the - * signal should be blocked. - */ -static int drm_notifier(void *priv) -{ - drm_sigdata_t *s = (drm_sigdata_t *) priv; - unsigned int old, new, prev; - - /* Allow signal delivery if lock isn't held */ - if (!s->lock || !_DRM_LOCK_IS_HELD(s->lock->lock) - || _DRM_LOCKING_CONTEXT(s->lock->lock) != s->context) - return 1; - - /* Otherwise, set flag to force call to - drmUnlock */ - do { - old = s->lock->lock; - new = old | _DRM_LOCK_CONT; - prev = cmpxchg(&s->lock->lock, old, new); - } while (prev != old); - return 0; -} |