patch-2.4.23 linux-2.4.23/drivers/char/drm/radeon_mem.c

• Lines: 339
• Date: 2003-11-28 10:26:20.000000000 -0800
• Orig file: linux-2.4.22/drivers/char/drm/radeon_mem.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.22/drivers/char/drm/radeon_mem.c linux-2.4.23/drivers/char/drm/radeon_mem.c
@@ -0,0 +1,338 @@
+/* radeon_mem.c -- Simple agp/fb memory manager for radeon -*- linux-c -*-
+ *
+ * Copyright (C) The Weather Channel, Inc.  2002.  All Rights Reserved.
+ * 
+ * The Weather Channel (TM) funded Tungsten Graphics to develop the
+ * initial release of the Radeon 8500 driver under the XFree86 license.
+ * This notice must be preserved.
+ *
+ * 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:
+ *    Keith Whitwell <keith@tungstengraphics.com>
+ */
+
+#include "radeon.h"
+#include "drmP.h"
+#include "drm.h"
+#include "radeon_drm.h"
+#include "radeon_drv.h"
+#include "drm_os_linux.h"
+
+/* Very simple allocator for agp memory, working on a static range
+ * already mapped into each client's address space.  
+ */
+
+static struct mem_block *split_block(struct mem_block *p, int start, int size,
+				     int pid )
+{
+	/* Maybe cut off the start of an existing block */
+	if (start > p->start) {
+		struct mem_block *newblock = kmalloc(sizeof(*newblock), GFP_KERNEL);
+		if (!newblock) 
+			goto out;
+		newblock->start = start;
+		newblock->size = p->size - (start - p->start);
+		newblock->pid = 0;
+		newblock->next = p->next;
+		newblock->prev = p;
+		p->next->prev = newblock;
+		p->next = newblock;
+		p->size -= newblock->size;
+		p = newblock;
+	}
+   
+	/* Maybe cut off the end of an existing block */
+	if (size < p->size) {
+		struct mem_block *newblock = kmalloc(sizeof(*newblock), GFP_KERNEL);
+		if (!newblock)
+			goto out;
+		newblock->start = start + size;
+		newblock->size = p->size - size;
+		newblock->pid = 0;
+		newblock->next = p->next;
+		newblock->prev = p;
+		p->next->prev = newblock;
+		p->next = newblock;
+		p->size = size;
+	}
+
+ out:
+	/* Our block is in the middle */
+	p->pid = pid;
+	return p;
+}
+
+static struct mem_block *alloc_block( struct mem_block *heap, int size, 
+				      int align2, int pid )
+{
+	struct mem_block *p;
+	int mask = (1 << align2)-1;
+
+	for (p = heap->next ; p != heap ; p = p->next) {
+		int start = (p->start + mask) & ~mask;
+		if (p->pid == 0 && start + size <= p->start + p->size)
+			return split_block( p, start, size, pid );
+	}
+
+	return NULL;
+}
+
+static struct mem_block *find_block( struct mem_block *heap, int start )
+{
+	struct mem_block *p;
+
+	for (p = heap->next ; p != heap ; p = p->next) 
+		if (p->start == start)
+			return p;
+
+	return NULL;
+}
+
+
+static void free_block( struct mem_block *p )
+{
+	p->pid = 0;
+
+	/* Assumes a single contiguous range.  Needs a special pid in
+	 * 'heap' to stop it being subsumed.
+	 */
+	if (p->next->pid == 0) {
+		struct mem_block *q = p->next;
+		p->size += q->size;
+		p->next = q->next;
+		p->next->prev = p;
+		kfree(q);
+	}
+
+	if (p->prev->pid == 0) {
+		struct mem_block *q = p->prev;
+		q->size += p->size;
+		q->next = p->next;
+		q->next->prev = q;
+		kfree(p);
+	}
+}
+
+static void print_heap( struct mem_block *heap )
+{
+	struct mem_block *p;
+
+	for (p = heap->next ; p != heap ; p = p->next) 
+		DRM_DEBUG("0x%x..0x%x (0x%x) -- owner %d\n",
+			  p->start, p->start + p->size,
+			  p->size, p->pid);
+}
+
+/* Initialize.  How to check for an uninitialized heap?
+ */
+static int init_heap(struct mem_block **heap, int start, int size)
+{
+	struct mem_block *blocks = kmalloc(sizeof(*blocks), GFP_KERNEL);
+
+	if (!blocks) 
+		return -ENOMEM;
+	
+	*heap = kmalloc(sizeof(**heap), GFP_KERNEL);
+	if (!*heap) {
+		kfree( blocks );
+		return -ENOMEM;
+	}
+
+	blocks->start = start;
+	blocks->size = size;
+	blocks->pid = 0;
+	blocks->next = blocks->prev = *heap;
+
+	memset( *heap, 0, sizeof(**heap) );
+	(*heap)->pid = -1;
+	(*heap)->next = (*heap)->prev = blocks;
+	return 0;
+}
+
+
+/* Free all blocks associated with the releasing pid.
+ */
+void radeon_mem_release( struct mem_block *heap )
+{
+	int pid = current->pid;
+	struct mem_block *p;
+
+	if (!heap || !heap->next)
+		return;
+
+	for (p = heap->next ; p != heap ; p = p->next) {
+		if (p->pid == pid) 
+			p->pid = 0;
+	}
+
+	/* Assumes a single contiguous range.  Needs a special pid in
+	 * 'heap' to stop it being subsumed.
+	 */
+	for (p = heap->next ; p != heap ; p = p->next) {
+		while (p->pid == 0 && p->next->pid == 0) {
+			struct mem_block *q = p->next;
+			p->size += q->size;
+			p->next = q->next;
+			p->next->prev = p;
+			kfree(q);
+		}
+	}
+}
+
+/* Shutdown.
+ */
+void radeon_mem_takedown( struct mem_block **heap )
+{
+	struct mem_block *p;
+	
+	if (!*heap)
+		return;
+
+	for (p = (*heap)->next ; p != *heap ; ) {
+		struct mem_block *q = p;
+		p = p->next;
+		kfree(q);
+	}
+
+	kfree( *heap );
+	*heap = 0;
+}
+
+
+
+/* IOCTL HANDLERS */
+
+static struct mem_block **get_heap( drm_radeon_private_t *dev_priv,
+				   int region )
+{
+	switch( region ) {
+	case RADEON_MEM_REGION_AGP:
+ 		return &dev_priv->agp_heap; 
+	case RADEON_MEM_REGION_FB:
+		return &dev_priv->fb_heap;
+	default:
+		return 0;
+	}
+}
+
+int radeon_mem_alloc(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long data )
+{
+        drm_file_t      *priv   = filp->private_data;
+        drm_device_t    *dev    = priv->dev;
+        drm_radeon_private_t *dev_priv = dev->dev_private;
+	drm_radeon_mem_alloc_t alloc;
+	struct mem_block *block, **heap;
+
+	if ( !dev_priv ) {
+		DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );
+		return -EINVAL;
+	}
+
+	DRM_COPY_FROM_USER_IOCTL( alloc, (drm_radeon_mem_alloc_t *)data,
+				  sizeof(alloc) );
+
+	heap = get_heap( dev_priv, alloc.region );
+	if (!heap || !*heap)
+		return -EFAULT;
+	
+	/* Make things easier on ourselves: all allocations at least
+	 * 4k aligned.
+	 */
+	if (alloc.alignment < 12)
+		alloc.alignment = 12;
+
+	block = alloc_block( *heap, alloc.size, alloc.alignment,
+			     current->pid );
+
+	if (!block) 
+		return -ENOMEM;
+
+	if ( copy_to_user( alloc.region_offset, &block->start, 
+			       sizeof(int) ) ) {
+		DRM_ERROR( "copy_to_user\n" );
+		return -EFAULT;
+	}
+	
+	return 0;
+}
+
+
+
+int radeon_mem_free(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long data)
+{
+        drm_file_t      *priv   = filp->private_data;
+        drm_device_t    *dev    = priv->dev;
+	drm_radeon_private_t *dev_priv = dev->dev_private;
+	drm_radeon_mem_free_t memfree;
+	struct mem_block *block, **heap;
+
+	if ( !dev_priv ) {
+		DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );
+		return -EINVAL;
+	}
+
+	DRM_COPY_FROM_USER_IOCTL( memfree, (drm_radeon_mem_free_t *)data,
+				  sizeof(memfree) );
+
+	heap = get_heap( dev_priv, memfree.region );
+	if (!heap || !*heap)
+		return -EFAULT;
+	
+	block = find_block( *heap, memfree.region_offset );
+	if (!block)
+		return -EFAULT;
+
+	if (block->pid != current->pid)
+		return -EPERM;
+
+	free_block( block );	
+	return 0;
+}
+
+int radeon_mem_init_heap(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long data)
+{
+        drm_file_t      *priv   = filp->private_data;
+        drm_device_t    *dev    = priv->dev;
+	drm_radeon_private_t *dev_priv = dev->dev_private;
+	drm_radeon_mem_init_heap_t initheap;
+	struct mem_block **heap;
+
+	if ( !dev_priv ) {
+		DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );
+		return -EINVAL;
+	}
+
+	DRM_COPY_FROM_USER_IOCTL( initheap, (drm_radeon_mem_init_heap_t *)data,
+				  sizeof(initheap) );
+
+	heap = get_heap( dev_priv, initheap.region );
+	if (!heap) 
+		return -EFAULT;
+	
+	if (*heap) {
+		DRM_ERROR("heap already initialized?");
+		return -EFAULT;
+	}
+		
+	return init_heap( heap, initheap.start, initheap.size );
+}
+
+