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-rw-r--r--linux/gamma_context.h495
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diff --git a/linux/gamma_context.h b/linux/gamma_context.h
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--- /dev/null
+++ b/linux/gamma_context.h
@@ -0,0 +1,495 @@
+/* drm_context.h -- IOCTLs for generic contexts -*- linux-c -*-
+ * Created: Fri Nov 24 18:31:37 2000 by gareth@valinux.com
+ *
+ * Copyright 1999, 2000 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>
+ * ChangeLog:
+ * 2001-11-16 Torsten Duwe <duwe@caldera.de>
+ * added context constructor/destructor hooks,
+ * needed by SiS driver's memory management.
+ */
+
+/* ================================================================
+ * Old-style context support -- only used by gamma.
+ */
+
+
+/* The drm_read and drm_write_string code (especially that which manages
+ the circular buffer), is based on Alessandro Rubini's LINUX DEVICE
+ DRIVERS (Cambridge: O'Reilly, 1998), pages 111-113. */
+
+ssize_t DRM(read)(struct file *filp, char *buf, size_t count, loff_t *off)
+{
+ drm_file_t *priv = filp->private_data;
+ drm_device_t *dev = priv->dev;
+ int left;
+ int avail;
+ int send;
+ int cur;
+
+ DRM_DEBUG("%p, %p\n", dev->buf_rp, dev->buf_wp);
+
+ while (dev->buf_rp == dev->buf_wp) {
+ DRM_DEBUG(" sleeping\n");
+ if (filp->f_flags & O_NONBLOCK) {
+ return -EAGAIN;
+ }
+ interruptible_sleep_on(&dev->buf_readers);
+ if (signal_pending(current)) {
+ DRM_DEBUG(" interrupted\n");
+ return -ERESTARTSYS;
+ }
+ DRM_DEBUG(" awake\n");
+ }
+
+ left = (dev->buf_rp + DRM_BSZ - dev->buf_wp) % DRM_BSZ;
+ avail = DRM_BSZ - left;
+ send = DRM_MIN(avail, count);
+
+ while (send) {
+ if (dev->buf_wp > dev->buf_rp) {
+ cur = DRM_MIN(send, dev->buf_wp - dev->buf_rp);
+ } else {
+ cur = DRM_MIN(send, dev->buf_end - dev->buf_rp);
+ }
+ if (copy_to_user(buf, dev->buf_rp, cur))
+ return -EFAULT;
+ dev->buf_rp += cur;
+ if (dev->buf_rp == dev->buf_end) dev->buf_rp = dev->buf;
+ send -= cur;
+ }
+
+ wake_up_interruptible(&dev->buf_writers);
+ return DRM_MIN(avail, count);;
+}
+
+
+/* In an incredibly convoluted setup, the kernel module actually calls
+ * back into the X server to perform context switches on behalf of the
+ * 3d clients.
+ */
+int DRM(write_string)(drm_device_t *dev, const char *s)
+{
+ int left = (dev->buf_rp + DRM_BSZ - dev->buf_wp) % DRM_BSZ;
+ int send = strlen(s);
+ int count;
+
+ DRM_DEBUG("%d left, %d to send (%p, %p)\n",
+ left, send, dev->buf_rp, dev->buf_wp);
+
+ if (left == 1 || dev->buf_wp != dev->buf_rp) {
+ DRM_ERROR("Buffer not empty (%d left, wp = %p, rp = %p)\n",
+ left,
+ dev->buf_wp,
+ dev->buf_rp);
+ }
+
+ while (send) {
+ if (dev->buf_wp >= dev->buf_rp) {
+ count = DRM_MIN(send, dev->buf_end - dev->buf_wp);
+ if (count == left) --count; /* Leave a hole */
+ } else {
+ count = DRM_MIN(send, dev->buf_rp - dev->buf_wp - 1);
+ }
+ strncpy(dev->buf_wp, s, count);
+ dev->buf_wp += count;
+ if (dev->buf_wp == dev->buf_end) dev->buf_wp = dev->buf;
+ send -= count;
+ }
+
+ if (dev->buf_async) kill_fasync(&dev->buf_async, SIGIO, POLL_IN);
+
+ DRM_DEBUG("waking\n");
+ wake_up_interruptible(&dev->buf_readers);
+ return 0;
+}
+
+unsigned int DRM(poll)(struct file *filp, struct poll_table_struct *wait)
+{
+ drm_file_t *priv = filp->private_data;
+ drm_device_t *dev = priv->dev;
+
+ poll_wait(filp, &dev->buf_readers, wait);
+ if (dev->buf_wp != dev->buf_rp) return POLLIN | POLLRDNORM;
+ return 0;
+}
+
+int DRM(context_switch)(drm_device_t *dev, int old, int new)
+{
+ char buf[64];
+ drm_queue_t *q;
+
+#if 0
+ atomic_inc(&dev->total_ctx);
+#endif
+
+ if (test_and_set_bit(0, &dev->context_flag)) {
+ DRM_ERROR("Reentering -- FIXME\n");
+ return -EBUSY;
+ }
+
+
+ DRM_DEBUG("Context switch from %d to %d\n", old, new);
+
+ if (new >= dev->queue_count) {
+ clear_bit(0, &dev->context_flag);
+ return -EINVAL;
+ }
+
+ if (new == dev->last_context) {
+ clear_bit(0, &dev->context_flag);
+ return 0;
+ }
+
+ q = dev->queuelist[new];
+ atomic_inc(&q->use_count);
+ if (atomic_read(&q->use_count) == 1) {
+ atomic_dec(&q->use_count);
+ clear_bit(0, &dev->context_flag);
+ return -EINVAL;
+ }
+
+ if (DRM(flags) & DRM_FLAG_NOCTX) {
+ DRM(context_switch_complete)(dev, new);
+ } else {
+ sprintf(buf, "C %d %d\n", old, new);
+ DRM(write_string)(dev, buf);
+ }
+
+ atomic_dec(&q->use_count);
+
+ return 0;
+}
+
+int DRM(context_switch_complete)(drm_device_t *dev, int new)
+{
+ drm_device_dma_t *dma = dev->dma;
+
+ dev->last_context = new; /* PRE/POST: This is the _only_ writer. */
+ dev->last_switch = jiffies;
+
+ if (!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
+ DRM_ERROR("Lock isn't held after context switch\n");
+ }
+
+ if (!dma || !(dma->next_buffer && dma->next_buffer->while_locked)) {
+ if (DRM(lock_free)(dev, &dev->lock.hw_lock->lock,
+ DRM_KERNEL_CONTEXT)) {
+ DRM_ERROR("Cannot free lock\n");
+ }
+ }
+
+ clear_bit(0, &dev->context_flag);
+ wake_up_interruptible(&dev->context_wait);
+
+ return 0;
+}
+
+static int DRM(init_queue)(drm_device_t *dev, drm_queue_t *q, drm_ctx_t *ctx)
+{
+ DRM_DEBUG("\n");
+
+ if (atomic_read(&q->use_count) != 1
+ || atomic_read(&q->finalization)
+ || atomic_read(&q->block_count)) {
+ DRM_ERROR("New queue is already in use: u%d f%d b%d\n",
+ atomic_read(&q->use_count),
+ atomic_read(&q->finalization),
+ atomic_read(&q->block_count));
+ }
+
+ atomic_set(&q->finalization, 0);
+ atomic_set(&q->block_count, 0);
+ atomic_set(&q->block_read, 0);
+ atomic_set(&q->block_write, 0);
+ atomic_set(&q->total_queued, 0);
+ atomic_set(&q->total_flushed, 0);
+ atomic_set(&q->total_locks, 0);
+
+ init_waitqueue_head(&q->write_queue);
+ init_waitqueue_head(&q->read_queue);
+ init_waitqueue_head(&q->flush_queue);
+
+ q->flags = ctx->flags;
+
+ DRM(waitlist_create)(&q->waitlist, dev->dma->buf_count);
+
+ return 0;
+}
+
+
+/* drm_alloc_queue:
+PRE: 1) dev->queuelist[0..dev->queue_count] is allocated and will not
+ disappear (so all deallocation must be done after IOCTLs are off)
+ 2) dev->queue_count < dev->queue_slots
+ 3) dev->queuelist[i].use_count == 0 and
+ dev->queuelist[i].finalization == 0 if i not in use
+POST: 1) dev->queuelist[i].use_count == 1
+ 2) dev->queue_count < dev->queue_slots */
+
+static int DRM(alloc_queue)(drm_device_t *dev)
+{
+ int i;
+ drm_queue_t *queue;
+ int oldslots;
+ int newslots;
+ /* Check for a free queue */
+ for (i = 0; i < dev->queue_count; i++) {
+ atomic_inc(&dev->queuelist[i]->use_count);
+ if (atomic_read(&dev->queuelist[i]->use_count) == 1
+ && !atomic_read(&dev->queuelist[i]->finalization)) {
+ DRM_DEBUG("%d (free)\n", i);
+ return i;
+ }
+ atomic_dec(&dev->queuelist[i]->use_count);
+ }
+ /* Allocate a new queue */
+ down(&dev->struct_sem);
+
+ queue = DRM(alloc)(sizeof(*queue), DRM_MEM_QUEUES);
+ memset(queue, 0, sizeof(*queue));
+ atomic_set(&queue->use_count, 1);
+
+ ++dev->queue_count;
+ if (dev->queue_count >= dev->queue_slots) {
+ oldslots = dev->queue_slots * sizeof(*dev->queuelist);
+ if (!dev->queue_slots) dev->queue_slots = 1;
+ dev->queue_slots *= 2;
+ newslots = dev->queue_slots * sizeof(*dev->queuelist);
+
+ dev->queuelist = DRM(realloc)(dev->queuelist,
+ oldslots,
+ newslots,
+ DRM_MEM_QUEUES);
+ if (!dev->queuelist) {
+ up(&dev->struct_sem);
+ DRM_DEBUG("out of memory\n");
+ return -ENOMEM;
+ }
+ }
+ dev->queuelist[dev->queue_count-1] = queue;
+
+ up(&dev->struct_sem);
+ DRM_DEBUG("%d (new)\n", dev->queue_count - 1);
+ return dev->queue_count - 1;
+}
+
+int DRM(resctx)(struct inode *inode, struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ drm_ctx_res_t res;
+ drm_ctx_t ctx;
+ int i;
+
+ DRM_DEBUG("%d\n", DRM_RESERVED_CONTEXTS);
+ if (copy_from_user(&res, (drm_ctx_res_t *)arg, sizeof(res)))
+ return -EFAULT;
+ if (res.count >= DRM_RESERVED_CONTEXTS) {
+ memset(&ctx, 0, sizeof(ctx));
+ for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
+ ctx.handle = i;
+ if (copy_to_user(&res.contexts[i],
+ &i,
+ sizeof(i)))
+ return -EFAULT;
+ }
+ }
+ res.count = DRM_RESERVED_CONTEXTS;
+ if (copy_to_user((drm_ctx_res_t *)arg, &res, sizeof(res)))
+ return -EFAULT;
+ return 0;
+}
+
+int DRM(addctx)(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;
+ drm_ctx_t ctx;
+
+ if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
+ return -EFAULT;
+ if ((ctx.handle = DRM(alloc_queue)(dev)) == DRM_KERNEL_CONTEXT) {
+ /* Init kernel's context and get a new one. */
+ DRM(init_queue)(dev, dev->queuelist[ctx.handle], &ctx);
+ ctx.handle = DRM(alloc_queue)(dev);
+ }
+ DRM(init_queue)(dev, dev->queuelist[ctx.handle], &ctx);
+ DRM_DEBUG("%d\n", ctx.handle);
+ if (copy_to_user((drm_ctx_t *)arg, &ctx, sizeof(ctx)))
+ return -EFAULT;
+ return 0;
+}
+
+int DRM(modctx)(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;
+ drm_ctx_t ctx;
+ drm_queue_t *q;
+
+ if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
+ return -EFAULT;
+
+ DRM_DEBUG("%d\n", ctx.handle);
+
+ if (ctx.handle < 0 || ctx.handle >= dev->queue_count) return -EINVAL;
+ q = dev->queuelist[ctx.handle];
+
+ atomic_inc(&q->use_count);
+ if (atomic_read(&q->use_count) == 1) {
+ /* No longer in use */
+ atomic_dec(&q->use_count);
+ return -EINVAL;
+ }
+
+ if (DRM_BUFCOUNT(&q->waitlist)) {
+ atomic_dec(&q->use_count);
+ return -EBUSY;
+ }
+
+ q->flags = ctx.flags;
+
+ atomic_dec(&q->use_count);
+ return 0;
+}
+
+int DRM(getctx)(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;
+ drm_ctx_t ctx;
+ drm_queue_t *q;
+
+ if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
+ return -EFAULT;
+
+ DRM_DEBUG("%d\n", ctx.handle);
+
+ if (ctx.handle >= dev->queue_count) return -EINVAL;
+ q = dev->queuelist[ctx.handle];
+
+ atomic_inc(&q->use_count);
+ if (atomic_read(&q->use_count) == 1) {
+ /* No longer in use */
+ atomic_dec(&q->use_count);
+ return -EINVAL;
+ }
+
+ ctx.flags = q->flags;
+ atomic_dec(&q->use_count);
+
+ if (copy_to_user((drm_ctx_t *)arg, &ctx, sizeof(ctx)))
+ return -EFAULT;
+
+ return 0;
+}
+
+int DRM(switchctx)(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;
+ drm_ctx_t ctx;
+
+ if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
+ return -EFAULT;
+ DRM_DEBUG("%d\n", ctx.handle);
+ return DRM(context_switch)(dev, dev->last_context, ctx.handle);
+}
+
+int DRM(newctx)(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;
+ drm_ctx_t ctx;
+
+ if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
+ return -EFAULT;
+ DRM_DEBUG("%d\n", ctx.handle);
+ DRM(context_switch_complete)(dev, ctx.handle);
+
+ return 0;
+}
+
+int DRM(rmctx)(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;
+ drm_ctx_t ctx;
+ drm_queue_t *q;
+ drm_buf_t *buf;
+
+ if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
+ return -EFAULT;
+ DRM_DEBUG("%d\n", ctx.handle);
+
+ if (ctx.handle >= dev->queue_count) return -EINVAL;
+ q = dev->queuelist[ctx.handle];
+
+ atomic_inc(&q->use_count);
+ if (atomic_read(&q->use_count) == 1) {
+ /* No longer in use */
+ atomic_dec(&q->use_count);
+ return -EINVAL;
+ }
+
+ atomic_inc(&q->finalization); /* Mark queue in finalization state */
+ atomic_sub(2, &q->use_count); /* Mark queue as unused (pending
+ finalization) */
+
+ while (test_and_set_bit(0, &dev->interrupt_flag)) {
+ schedule();
+ if (signal_pending(current)) {
+ clear_bit(0, &dev->interrupt_flag);
+ return -EINTR;
+ }
+ }
+ /* Remove queued buffers */
+ while ((buf = DRM(waitlist_get)(&q->waitlist))) {
+ DRM(free_buffer)(dev, buf);
+ }
+ clear_bit(0, &dev->interrupt_flag);
+
+ /* Wakeup blocked processes */
+ wake_up_interruptible(&q->read_queue);
+ wake_up_interruptible(&q->write_queue);
+ wake_up_interruptible(&q->flush_queue);
+
+ /* Finalization over. Queue is made
+ available when both use_count and
+ finalization become 0, which won't
+ happen until all the waiting processes
+ stop waiting. */
+ atomic_dec(&q->finalization);
+ return 0;
+}
+
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