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authorDaryll Strauss <daryll@users.sourceforge.net>1999-12-05 23:10:37 +0000
committerDaryll Strauss <daryll@users.sourceforge.net>1999-12-05 23:10:37 +0000
commitb6a28bfe98f2c89cfb91079bd3c7b63fb0144eb1 (patch)
tree23f9527b5ef5e99277c0c5f1e7d896abdb69a33a /linux/lock.c
parenta8ab34ed47c1880b1206812c9b1b8312cd7a3357 (diff)
First DRI release of 3dfx driver.
Diffstat (limited to 'linux/lock.c')
-rw-r--r--linux/lock.c231
1 files changed, 231 insertions, 0 deletions
diff --git a/linux/lock.c b/linux/lock.c
new file mode 100644
index 00000000..ab1c0742
--- /dev/null
+++ b/linux/lock.c
@@ -0,0 +1,231 @@
+/* lock.c -- IOCTLs for locking -*- linux-c -*-
+ * Created: Tue Feb 2 08:37:54 1999 by faith@precisioninsight.com
+ * Revised: Tue Oct 12 08:51:06 1999 by faith@precisioninsight.com
+ *
+ * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
+ * 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.
+ *
+ * $PI: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/kernel/lock.c,v 1.5 1999/08/30 13:05:00 faith Exp $
+ * $XFree86: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/kernel/lock.c,v 1.1 1999/09/25 14:38:01 dawes Exp $
+ *
+ */
+
+#define __NO_VERSION__
+#include "drmP.h"
+
+int drm_block(struct inode *inode, struct file *filp, unsigned int cmd,
+ unsigned long arg)
+{
+ DRM_DEBUG("\n");
+ return 0;
+}
+
+int drm_unblock(struct inode *inode, struct file *filp, unsigned int cmd,
+ unsigned long arg)
+{
+ 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;
+ }
+ wake_up_interruptible(&dev->lock.lock_queue);
+ return 0;
+}
+
+static int drm_flush_queue(drm_device_t *dev, int context)
+{
+ DECLARE_WAITQUEUE(entry, current);
+ int ret = 0;
+ 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);
+ current->state = TASK_INTERRUPTIBLE;
+ add_wait_queue(&q->flush_queue, &entry);
+ atomic_inc(&q->block_count);
+ for (;;) {
+ if (!DRM_BUFCOUNT(&q->waitlist)) break;
+ schedule();
+ if (signal_pending(current)) {
+ ret = -EINTR; /* Can't restart */
+ break;
+ }
+ }
+ atomic_dec(&q->block_count);
+ current->state = TASK_RUNNING;
+ remove_wait_queue(&q->flush_queue, &entry);
+ }
+ 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);
+ wake_up_interruptible(&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(struct inode *inode, struct file *filp, unsigned int cmd,
+ unsigned long arg)
+{
+ drm_file_t *priv = filp->private_data;
+ drm_device_t *dev = priv->dev;
+ int ret = 0;
+ drm_lock_t lock;
+
+ DRM_DEBUG("\n");
+
+ copy_from_user_ret(&lock, (drm_lock_t *)arg, sizeof(lock), -EFAULT);
+ ret = drm_flush_block_and_flush(dev, lock.context, lock.flags);
+ drm_flush_unblock(dev, lock.context, lock.flags);
+ return ret;
+}