diff options
Diffstat (limited to 'bsd/drm/lock.c')
| -rw-r--r-- | bsd/drm/lock.c | 223 |
1 files changed, 0 insertions, 223 deletions
diff --git a/bsd/drm/lock.c b/bsd/drm/lock.c deleted file mode 100644 index ec295b2b..00000000 --- a/bsd/drm/lock.c +++ /dev/null @@ -1,223 +0,0 @@ -/* lock.c -- IOCTLs for locking -*- c -*- - * Created: Tue Feb 2 08:37:54 1999 by faith@precisioninsight.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 - * PRECISION INSIGHT 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> - * - */ - -#define __NO_VERSION__ -#include "drmP.h" - -int -drm_block(dev_t kdev, u_long cmd, caddr_t data, int flags, struct proc *p) -{ - DRM_DEBUG("\n"); - return 0; -} - -int -drm_unblock(dev_t kdev, u_long cmd, caddr_t data, int flags, struct proc *p) -{ - DRM_DEBUG("\n"); - return 0; -} - -int drm_lock_take(__volatile__ unsigned int *lock, unsigned int context) -{ - unsigned int old; - unsigned int new; - char failed; - - DRM_DEBUG("%d attempts\n", context); - do { - old = *lock; - if (old & _DRM_LOCK_HELD) new = old | _DRM_LOCK_CONT; - else new = context | _DRM_LOCK_HELD; - _DRM_CAS(lock, old, new, failed); - } while (failed); - 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 */ - DRM_DEBUG("%d\n", context); - return 1; - } - DRM_DEBUG("%d unable to get lock held by %d\n", - context, _DRM_LOCKING_CONTEXT(old)); - 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. */ -int drm_lock_transfer(drm_device_t *dev, - __volatile__ unsigned int *lock, unsigned int context) -{ - unsigned int old; - unsigned int new; - char failed; - - dev->lock.pid = 0; - do { - old = *lock; - new = context | _DRM_LOCK_HELD; - _DRM_CAS(lock, old, new, failed); - } while (failed); - DRM_DEBUG("%d => %d\n", _DRM_LOCKING_CONTEXT(old), context); - return 1; -} - -int drm_lock_free(drm_device_t *dev, - __volatile__ unsigned int *lock, unsigned int context) -{ - unsigned int old; - unsigned int new; - char failed; - pid_t pid = dev->lock.pid; - - DRM_DEBUG("%d\n", context); - dev->lock.pid = 0; - do { - old = *lock; - new = 0; - _DRM_CAS(lock, old, new, failed); - } while (failed); - if (_DRM_LOCK_IS_HELD(old) && _DRM_LOCKING_CONTEXT(old) != context) { - DRM_ERROR("%d freed heavyweight lock held by %d (pid %d)\n", - context, - _DRM_LOCKING_CONTEXT(old), - pid); - return 1; - } - wakeup(&dev->lock.lock_queue); - return 0; -} - -static int drm_flush_queue(drm_device_t *dev, int context) -{ - int ret = 0; - int error; - drm_queue_t *q = dev->queuelist[context]; - - DRM_DEBUG("\n"); - - atomic_inc(&q->use_count); - if (atomic_read(&q->use_count) > 1) { - atomic_inc(&q->block_write); - atomic_inc(&q->block_count); - for (;;) { - if (!DRM_BUFCOUNT(&q->waitlist)) break; - error = tsleep(&q->flush_queue, PCATCH|PZERO, "drmfq", 0); - if (error) - return error; - } - atomic_dec(&q->block_count); - } - atomic_dec(&q->use_count); - atomic_inc(&q->total_flushed); - - /* NOTE: block_write is still incremented! - Use drm_flush_unlock_queue to decrement. */ - return ret; -} - -static int drm_flush_unblock_queue(drm_device_t *dev, int context) -{ - drm_queue_t *q = dev->queuelist[context]; - - DRM_DEBUG("\n"); - - atomic_inc(&q->use_count); - if (atomic_read(&q->use_count) > 1) { - if (atomic_read(&q->block_write)) { - atomic_dec(&q->block_write); - wakeup(&q->write_queue); - } - } - atomic_dec(&q->use_count); - return 0; -} - -int drm_flush_block_and_flush(drm_device_t *dev, int context, - drm_lock_flags_t flags) -{ - int ret = 0; - int i; - - DRM_DEBUG("\n"); - - if (flags & _DRM_LOCK_FLUSH) { - ret = drm_flush_queue(dev, DRM_KERNEL_CONTEXT); - if (!ret) ret = drm_flush_queue(dev, context); - } - if (flags & _DRM_LOCK_FLUSH_ALL) { - for (i = 0; !ret && i < dev->queue_count; i++) { - ret = drm_flush_queue(dev, i); - } - } - return ret; -} - -int drm_flush_unblock(drm_device_t *dev, int context, drm_lock_flags_t flags) -{ - int ret = 0; - int i; - - DRM_DEBUG("\n"); - - if (flags & _DRM_LOCK_FLUSH) { - ret = drm_flush_unblock_queue(dev, DRM_KERNEL_CONTEXT); - if (!ret) ret = drm_flush_unblock_queue(dev, context); - } - if (flags & _DRM_LOCK_FLUSH_ALL) { - for (i = 0; !ret && i < dev->queue_count; i++) { - ret = drm_flush_unblock_queue(dev, i); - } - } - - return ret; -} - -int drm_finish(dev_t kdev, u_long cmd, caddr_t data, int flags, struct proc *p) -{ - drm_device_t *dev = kdev->si_drv1; - int ret = 0; - drm_lock_t lock; - - DRM_DEBUG("\n"); - - lock = *(drm_lock_t *) data; - ret = drm_flush_block_and_flush(dev, lock.context, lock.flags); - drm_flush_unblock(dev, lock.context, lock.flags); - return ret; -} |