renesas/drm.git - libdrm, cloned from git://anongit.freedesktop.org/mesa/drm

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Diffstat (limited to 'xf86drmMode.c')

0 files changed, 0 insertions, 0 deletions

/* 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); 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!


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