Merge master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6 into next

1 files changed, 0 insertions, 396 deletions

diff --git a/drivers/char/drm/drm_lock.c b/drivers/char/drm/drm_lock.c
deleted file mode 100644
index 12dcdd1832f..00000000000
--- a/drivers/char/drm/drm_lock.c
+++ /dev/null
@@ -1,396 +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_notifier(void *priv);
-
-/**
- * Lock ioctl.
- *
- * \param inode device inode.
- * \param file_priv DRM file private.
- * \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 drm_device *dev, void *data, struct drm_file *file_priv)
-{
-	DECLARE_WAITQUEUE(entry, current);
-	struct drm_lock *lock = data;
-	int ret = 0;
-	unsigned long irqflags;
-
-	++file_priv->lock_count;
-
-	if (lock->context == DRM_KERNEL_CONTEXT) {
-		DRM_ERROR("Process %d using kernel context %d\n",
-			  task_pid_nr(current), lock->context);
-		return -EINVAL;
-	}
-
-	DRM_DEBUG("%d (pid %d) requests lock (0x%08x), flags = 0x%08x\n",
-		  lock->context, task_pid_nr(current),
-		  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);
-	spin_lock_irqsave(&dev->lock.spinlock, irqflags);
-	dev->lock.user_waiters++;
-	spin_unlock_irqrestore(&dev->lock.spinlock, irqflags);
-	for (;;) {
-		__set_current_state(TASK_INTERRUPTIBLE);
-		if (!dev->lock.hw_lock) {
-			/* Device has been unregistered */
-			ret = -EINTR;
-			break;
-		}
-		if (drm_lock_take(&dev->lock, lock->context)) {
-			dev->lock.file_priv = file_priv;
-			dev->lock.lock_time = jiffies;
-			atomic_inc(&dev->counts[_DRM_STAT_LOCKS]);
-			break;	/* Got lock */
-		}
-
-		/* Contention */
-		schedule();
-		if (signal_pending(current)) {
-			ret = -ERESTARTSYS;
-			break;
-		}
-	}
-	spin_lock_irqsave(&dev->lock.spinlock, irqflags);
-	dev->lock.user_waiters--;
-	spin_unlock_irqrestore(&dev->lock.spinlock, irqflags);
-	__set_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 -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 file_priv DRM file private.
- * \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 drm_device *dev, void *data, struct drm_file *file_priv)
-{
-	struct drm_lock *lock = data;
-	unsigned long irqflags;
-
-	if (lock->context == DRM_KERNEL_CONTEXT) {
-		DRM_ERROR("Process %d using kernel context %d\n",
-			  task_pid_nr(current), lock->context);
-		return -EINVAL;
-	}
-
-	spin_lock_irqsave(&dev->tasklet_lock, irqflags);
-
-	if (dev->locked_tasklet_func) {
-		dev->locked_tasklet_func(dev);
-
-		dev->locked_tasklet_func = NULL;
-	}
-
-	spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
-
-	atomic_inc(&dev->counts[_DRM_STAT_UNLOCKS]);
-
-	/* kernel_context_switch isn't used by any of the x86 drm
-	 * modules but is required by the Sparc driver.
-	 */
-	if (dev->driver->kernel_context_switch_unlock)
-		dev->driver->kernel_context_switch_unlock(dev);
-	else {
-		if (drm_lock_free(&dev->lock,lock->context)) {
-			/* FIXME: Should really bail out here. */
-		}
-	}
-
-	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(struct drm_lock_data *lock_data,
-		  unsigned int context)
-{
-	unsigned int old, new, prev;
-	volatile unsigned int *lock = &lock_data->hw_lock->lock;
-	unsigned long irqflags;
-
-	spin_lock_irqsave(&lock_data->spinlock, irqflags);
-	do {
-		old = *lock;
-		if (old & _DRM_LOCK_HELD)
-			new = old | _DRM_LOCK_CONT;
-		else {
-			new = context | _DRM_LOCK_HELD |
-				((lock_data->user_waiters + lock_data->kernel_waiters > 1) ?
-				 _DRM_LOCK_CONT : 0);
-		}
-		prev = cmpxchg(lock, old, new);
-	} while (prev != old);
-	spin_unlock_irqrestore(&lock_data->spinlock, irqflags);
-
-	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 ((_DRM_LOCKING_CONTEXT(new)) == context && (new & _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(struct drm_lock_data *lock_data,
-			     unsigned int context)
-{
-	unsigned int old, new, prev;
-	volatile unsigned int *lock = &lock_data->hw_lock->lock;
-
-	lock_data->file_priv = 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(struct drm_lock_data *lock_data, unsigned int context)
-{
-	unsigned int old, new, prev;
-	volatile unsigned int *lock = &lock_data->hw_lock->lock;
-	unsigned long irqflags;
-
-	spin_lock_irqsave(&lock_data->spinlock, irqflags);
-	if (lock_data->kernel_waiters != 0) {
-		drm_lock_transfer(lock_data, 0);
-		lock_data->idle_has_lock = 1;
-		spin_unlock_irqrestore(&lock_data->spinlock, irqflags);
-		return 1;
-	}
-	spin_unlock_irqrestore(&lock_data->spinlock, irqflags);
-
-	do {
-		old = *lock;
-		new = _DRM_LOCKING_CONTEXT(old);
-		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(&lock_data->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)
-{
-	struct drm_sigdata *s = (struct drm_sigdata *) 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;
-}
-
-/**
- * This function returns immediately and takes the hw lock
- * with the kernel context if it is free, otherwise it gets the highest priority when and if
- * it is eventually released.
- *
- * This guarantees that the kernel will _eventually_ have the lock _unless_ it is held
- * by a blocked process. (In the latter case an explicit wait for the hardware lock would cause
- * a deadlock, which is why the "idlelock" was invented).
- *
- * This should be sufficient to wait for GPU idle without
- * having to worry about starvation.
- */
-
-void drm_idlelock_take(struct drm_lock_data *lock_data)
-{
-	int ret = 0;
-	unsigned long irqflags;
-
-	spin_lock_irqsave(&lock_data->spinlock, irqflags);
-	lock_data->kernel_waiters++;
-	if (!lock_data->idle_has_lock) {
-
-		spin_unlock_irqrestore(&lock_data->spinlock, irqflags);
-		ret = drm_lock_take(lock_data, DRM_KERNEL_CONTEXT);
-		spin_lock_irqsave(&lock_data->spinlock, irqflags);
-
-		if (ret == 1)
-			lock_data->idle_has_lock = 1;
-	}
-	spin_unlock_irqrestore(&lock_data->spinlock, irqflags);
-}
-EXPORT_SYMBOL(drm_idlelock_take);
-
-void drm_idlelock_release(struct drm_lock_data *lock_data)
-{
-	unsigned int old, prev;
-	volatile unsigned int *lock = &lock_data->hw_lock->lock;
-	unsigned long irqflags;
-
-	spin_lock_irqsave(&lock_data->spinlock, irqflags);
-	if (--lock_data->kernel_waiters == 0) {
-		if (lock_data->idle_has_lock) {
-			do {
-				old = *lock;
-				prev = cmpxchg(lock, old, DRM_KERNEL_CONTEXT);
-			} while (prev != old);
-			wake_up_interruptible(&lock_data->lock_queue);
-			lock_data->idle_has_lock = 0;
-		}
-	}
-	spin_unlock_irqrestore(&lock_data->spinlock, irqflags);
-}
-EXPORT_SYMBOL(drm_idlelock_release);
-
-
-int drm_i_have_hw_lock(struct drm_device *dev, struct drm_file *file_priv)
-{
-	return (file_priv->lock_count && dev->lock.hw_lock &&
-		_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock) &&
-		dev->lock.file_priv == file_priv);
-}
-
-EXPORT_SYMBOL(drm_i_have_hw_lock);