diff options
Diffstat (limited to 'bsd/drm_lock.h')
| -rw-r--r-- | bsd/drm_lock.h | 96 |
1 files changed, 0 insertions, 96 deletions
diff --git a/bsd/drm_lock.h b/bsd/drm_lock.h deleted file mode 100644 index a87e0a3a..00000000 --- a/bsd/drm_lock.h +++ /dev/null @@ -1,96 +0,0 @@ -/* lock.c -- IOCTLs for locking -*- linux-c -*- - * 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. - * - * Authors: - * Rickard E. (Rik) Faith <faith@valinux.com> - * Gareth Hughes <gareth@valinux.com> - * - */ - -#include "drmP.h" - -int DRM(lock_take)(__volatile__ unsigned int *lock, unsigned int context) -{ - unsigned int old, new; - - do { - old = *lock; - if (old & _DRM_LOCK_HELD) new = old | _DRM_LOCK_CONT; - else new = context | _DRM_LOCK_HELD; - } while (!atomic_cmpset_int(lock, old, new)); - - 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. */ -int DRM(lock_transfer)(drm_device_t *dev, - __volatile__ unsigned int *lock, unsigned int context) -{ - unsigned int old, new; - - dev->lock.filp = NULL; - do { - old = *lock; - new = context | _DRM_LOCK_HELD; - } while (!atomic_cmpset_int(lock, old, new)); - - return 1; -} - -int DRM(lock_free)(drm_device_t *dev, - __volatile__ unsigned int *lock, unsigned int context) -{ - unsigned int old, new; - - dev->lock.filp = NULL; - do { - old = *lock; - new = 0; - } while (!atomic_cmpset_int(lock, old, new)); - - 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; - } - DRM_WAKEUP_INT((void *)&dev->lock.lock_queue); - return 0; -} - |