diff options
author | Dave Airlie <airlied@redhat.com> | 2008-08-14 09:36:34 +1000 |
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committer | Dave Airlie <airlied@redhat.com> | 2008-08-14 09:36:34 +1000 |
commit | 2d4420c6669dbaead27346b8c7e1979edc94ae5a (patch) | |
tree | 134fcbc1e4b902f7e1918d32c991bf2923da2101 /linux-core/drm_bo_lock.c | |
parent | 1c6abcefdc37f5cbb447e8fee1f3805fd7d19bea (diff) | |
parent | 2a65759d159478b126c660ef124777548dcc872c (diff) |
Merge branch 'radeon-gem-cs' into modesetting-gem
Conflicts:
libdrm/xf86drm.c
linux-core/Makefile.kernel
linux-core/drmP.h
linux-core/drm_compat.h
linux-core/drm_drv.c
linux-core/drm_stub.c
linux-core/drm_vm.c
shared-core/i915_dma.c
shared-core/r300_cmdbuf.c
shared-core/radeon_drv.h
Diffstat (limited to 'linux-core/drm_bo_lock.c')
-rw-r--r-- | linux-core/drm_bo_lock.c | 189 |
1 files changed, 0 insertions, 189 deletions
diff --git a/linux-core/drm_bo_lock.c b/linux-core/drm_bo_lock.c deleted file mode 100644 index 08b1c6be..00000000 --- a/linux-core/drm_bo_lock.c +++ /dev/null @@ -1,189 +0,0 @@ -/************************************************************************** - * - * Copyright (c) 2007 Tungsten Graphics, Inc., Cedar Park, TX., USA - * 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, sub license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL - * THE COPYRIGHT HOLDERS, AUTHORS 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: Thomas Hellström <thomas-at-tungstengraphics-dot-com> - */ - -/* - * This file implements a simple replacement for the buffer manager use - * of the heavyweight hardware lock. - * The lock is a read-write lock. Taking it in read mode is fast, and - * intended for in-kernel use only. - * Taking it in write mode is slow. - * - * The write mode is used only when there is a need to block all - * user-space processes from allocating a - * new memory area. - * Typical use in write mode is X server VT switching, and it's allowed - * to leave kernel space with the write lock held. If a user-space process - * dies while having the write-lock, it will be released during the file - * descriptor release. - * - * The read lock is typically placed at the start of an IOCTL- or - * user-space callable function that may end up allocating a memory area. - * This includes setstatus, super-ioctls and no_pfn; the latter may move - * unmappable regions to mappable. It's a bug to leave kernel space with the - * read lock held. - * - * Both read- and write lock taking may be interruptible for low signal-delivery - * latency. The locking functions will return -EAGAIN if interrupted by a - * signal. - * - * Locking order: The lock should be taken BEFORE any kernel mutexes - * or spinlocks. - */ - -#include "drmP.h" - -void drm_bo_init_lock(struct drm_bo_lock *lock) -{ - DRM_INIT_WAITQUEUE(&lock->queue); - atomic_set(&lock->write_lock_pending, 0); - atomic_set(&lock->readers, 0); -} - -void drm_bo_read_unlock(struct drm_bo_lock *lock) -{ - if (atomic_dec_and_test(&lock->readers)) - wake_up_all(&lock->queue); -} -EXPORT_SYMBOL(drm_bo_read_unlock); - -int drm_bo_read_lock(struct drm_bo_lock *lock, int interruptible) -{ - while (unlikely(atomic_read(&lock->write_lock_pending) != 0)) { - int ret; - - if (!interruptible) { - wait_event(lock->queue, - atomic_read(&lock->write_lock_pending) == 0); - continue; - } - ret = wait_event_interruptible - (lock->queue, atomic_read(&lock->write_lock_pending) == 0); - if (ret) - return -EAGAIN; - } - - while (unlikely(!atomic_add_unless(&lock->readers, 1, -1))) { - int ret; - if (!interruptible) { - wait_event(lock->queue, - atomic_read(&lock->readers) != -1); - continue; - } - ret = wait_event_interruptible - (lock->queue, atomic_read(&lock->readers) != -1); - if (ret) - return -EAGAIN; - } - return 0; -} -EXPORT_SYMBOL(drm_bo_read_lock); - -static int __drm_bo_write_unlock(struct drm_bo_lock *lock) -{ - if (unlikely(atomic_cmpxchg(&lock->readers, -1, 0) != -1)) - return -EINVAL; - wake_up_all(&lock->queue); - return 0; -} - -static void drm_bo_write_lock_remove(struct drm_file *file_priv, - struct drm_user_object *item) -{ - struct drm_bo_lock *lock = container_of(item, struct drm_bo_lock, base); - int ret; - - ret = __drm_bo_write_unlock(lock); - BUG_ON(ret); -} - -int drm_bo_write_lock(struct drm_bo_lock *lock, int interruptible, - struct drm_file *file_priv) -{ - int ret = 0; - struct drm_device *dev; - - atomic_inc(&lock->write_lock_pending); - - while (unlikely(atomic_cmpxchg(&lock->readers, 0, -1) != 0)) { - if (!interruptible) { - wait_event(lock->queue, - atomic_read(&lock->readers) == 0); - continue; - } - ret = wait_event_interruptible - (lock->queue, atomic_read(&lock->readers) == 0); - - if (ret) { - atomic_dec(&lock->write_lock_pending); - wake_up_all(&lock->queue); - return -EAGAIN; - } - } - - /* - * Add a dummy user-object, the destructor of which will - * make sure the lock is released if the client dies - * while holding it. - */ - - if (atomic_dec_and_test(&lock->write_lock_pending)) - wake_up_all(&lock->queue); - dev = file_priv->minor->dev; - mutex_lock(&dev->struct_mutex); - ret = drm_add_user_object(file_priv, &lock->base, 0); - lock->base.remove = &drm_bo_write_lock_remove; - lock->base.type = drm_lock_type; - if (ret) - (void)__drm_bo_write_unlock(lock); - - mutex_unlock(&dev->struct_mutex); - - return ret; -} - -int drm_bo_write_unlock(struct drm_bo_lock *lock, struct drm_file *file_priv) -{ - struct drm_device *dev = file_priv->minor->dev; - struct drm_ref_object *ro; - - mutex_lock(&dev->struct_mutex); - - if (lock->base.owner != file_priv) { - mutex_unlock(&dev->struct_mutex); - return -EINVAL; - } - ro = drm_lookup_ref_object(file_priv, &lock->base, _DRM_REF_USE); - BUG_ON(!ro); - drm_remove_ref_object(file_priv, ro); - lock->base.owner = NULL; - - mutex_unlock(&dev->struct_mutex); - return 0; -} |