1 files changed, 492 insertions, 0 deletions

diff --git a/drivers/char/drm/gamma_context.h b/drivers/char/drm/gamma_context.h
new file mode 100644
index 000000000000..d11b507f87ee
--- /dev/null
+++ b/drivers/char/drm/gamma_context.h
@@ -0,0 +1,492 @@
+/* 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 gamma_fops_read(struct file *filp, char __user *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 gamma_fops_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 (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;
+	}
+
+	/* This causes the X server to wake up & do a bunch of hardware
+	 * interaction to actually effect the context switch.
+	 */
+	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 __user *argp = (void __user *)arg;
+	drm_ctx_res_t	res;
+	drm_ctx_t	ctx;
+	int		i;
+
+	DRM_DEBUG("%d\n", DRM_RESERVED_CONTEXTS);
+	if (copy_from_user(&res, argp, 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(argp, &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;
+	drm_ctx_t	__user *argp = (void __user *)arg;
+
+	if (copy_from_user(&ctx, argp, 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(argp, &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 __user *)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	__user *argp = (void __user *)arg;
+	drm_ctx_t	ctx;
+	drm_queue_t	*q;
+
+	if (copy_from_user(&ctx, argp, 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(argp, &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 __user *)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 __user *)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 __user *)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;
+}
+