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https://git.FreeBSD.org/src.git
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9fb0767374
- S3 Savage driver ported. - Added support for ATI_fragment_shader registers for r200. - Improved r300 support, needed for latest r300 DRI driver. - (possibly) r300 PCIE support, needs X.Org server from CVS. - Added support for PCI Matrox cards. - Software fallbacks fixed for Rage 128, which used to render badly or hang. - Some issues reported by WITNESS are fixed. - i915 module Makefile added, as the driver may now be working, but is untested. - Added scripts for copying and preprocessing DRM CVS for inclusion in the kernel. Thanks to Daniel Stone for getting me started on that.
181 lines
4.9 KiB
C
181 lines
4.9 KiB
C
/* lock.c -- IOCTLs for locking -*- linux-c -*-
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* Created: Tue Feb 2 08:37:54 1999 by faith@valinux.com
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*/
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/*-
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Rickard E. (Rik) Faith <faith@valinux.com>
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* Gareth Hughes <gareth@valinux.com>
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "dev/drm/drmP.h"
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int drm_lock_take(__volatile__ unsigned int *lock, unsigned int context)
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{
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unsigned int old, new;
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do {
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old = *lock;
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if (old & _DRM_LOCK_HELD) new = old | _DRM_LOCK_CONT;
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else new = context | _DRM_LOCK_HELD;
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} while (!atomic_cmpset_int(lock, old, new));
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if (_DRM_LOCKING_CONTEXT(old) == context) {
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if (old & _DRM_LOCK_HELD) {
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if (context != DRM_KERNEL_CONTEXT) {
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DRM_ERROR("%d holds heavyweight lock\n",
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context);
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}
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return 0;
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}
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}
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if (new == (context | _DRM_LOCK_HELD)) {
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/* Have lock */
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return 1;
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}
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return 0;
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}
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/* This takes a lock forcibly and hands it to context. Should ONLY be used
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inside *_unlock to give lock to kernel before calling *_dma_schedule. */
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int drm_lock_transfer(drm_device_t *dev,
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__volatile__ unsigned int *lock, unsigned int context)
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{
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unsigned int old, new;
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dev->lock.filp = NULL;
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do {
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old = *lock;
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new = context | _DRM_LOCK_HELD;
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} while (!atomic_cmpset_int(lock, old, new));
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return 1;
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}
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int drm_lock_free(drm_device_t *dev,
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__volatile__ unsigned int *lock, unsigned int context)
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{
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unsigned int old, new;
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dev->lock.filp = NULL;
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do {
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old = *lock;
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new = 0;
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} while (!atomic_cmpset_int(lock, old, new));
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if (_DRM_LOCK_IS_HELD(old) && _DRM_LOCKING_CONTEXT(old) != context) {
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DRM_ERROR("%d freed heavyweight lock held by %d\n",
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context, _DRM_LOCKING_CONTEXT(old));
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return 1;
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}
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DRM_WAKEUP_INT((void *)&dev->lock.lock_queue);
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return 0;
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}
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int drm_lock(DRM_IOCTL_ARGS)
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{
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DRM_DEVICE;
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drm_lock_t lock;
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int ret = 0;
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DRM_COPY_FROM_USER_IOCTL(lock, (drm_lock_t *)data, sizeof(lock));
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if (lock.context == DRM_KERNEL_CONTEXT) {
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DRM_ERROR("Process %d using kernel context %d\n",
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DRM_CURRENTPID, lock.context);
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return EINVAL;
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}
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DRM_DEBUG("%d (pid %d) requests lock (0x%08x), flags = 0x%08x\n",
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lock.context, DRM_CURRENTPID, dev->lock.hw_lock->lock, lock.flags);
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if (dev->driver.use_dma_queue && lock.context < 0)
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return EINVAL;
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DRM_LOCK();
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for (;;) {
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if (drm_lock_take(&dev->lock.hw_lock->lock, lock.context)) {
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dev->lock.filp = (void *)(uintptr_t)DRM_CURRENTPID;
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dev->lock.lock_time = jiffies;
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atomic_inc(&dev->counts[_DRM_STAT_LOCKS]);
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break; /* Got lock */
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}
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/* Contention */
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#if defined(__FreeBSD__) && __FreeBSD_version > 500000
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ret = msleep((void *)&dev->lock.lock_queue, &dev->dev_lock,
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PZERO | PCATCH, "drmlk2", 0);
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#else
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ret = tsleep((void *)&dev->lock.lock_queue, PZERO | PCATCH,
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"drmlk2", 0);
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#endif
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if (ret != 0)
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break;
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}
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DRM_UNLOCK();
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DRM_DEBUG("%d %s\n", lock.context, ret ? "interrupted" : "has lock");
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if (ret != 0)
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return ret;
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/* XXX: Add signal blocking here */
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if (dev->driver.dma_quiescent != NULL &&
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(lock.flags & _DRM_LOCK_QUIESCENT))
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dev->driver.dma_quiescent(dev);
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return 0;
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}
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int drm_unlock(DRM_IOCTL_ARGS)
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{
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DRM_DEVICE;
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drm_lock_t lock;
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DRM_COPY_FROM_USER_IOCTL(lock, (drm_lock_t *)data, sizeof(lock));
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if (lock.context == DRM_KERNEL_CONTEXT) {
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DRM_ERROR("Process %d using kernel context %d\n",
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DRM_CURRENTPID, lock.context);
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return EINVAL;
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}
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atomic_inc(&dev->counts[_DRM_STAT_UNLOCKS]);
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DRM_LOCK();
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drm_lock_transfer(dev, &dev->lock.hw_lock->lock, DRM_KERNEL_CONTEXT);
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if (drm_lock_free(dev, &dev->lock.hw_lock->lock, DRM_KERNEL_CONTEXT)) {
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DRM_ERROR("\n");
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}
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DRM_UNLOCK();
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return 0;
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}
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