drm/shared/radeon_mem.c

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/* radeon_mem.c -- Simple GART/fb memory manager for radeon -*- linux-c -*-
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*
* 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"
/* Very simple allocator for GART memory, working on a static range
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* already mapped into each client's address space.
*/
static struct mem_block *split_block(struct mem_block *p, int start, int size,
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DRMFILE filp )
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{
/* Maybe cut off the start of an existing block */
if (start > p->start) {
struct mem_block *newblock = DRM(alloc)(sizeof(*newblock), DRM_MEM_BUFS );
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if (!newblock)
goto out;
newblock->start = start;
newblock->size = p->size - (start - p->start);
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newblock->filp = NULL;
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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 = DRM(alloc)(sizeof(*newblock), DRM_MEM_BUFS );
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if (!newblock)
goto out;
newblock->start = start + size;
newblock->size = p->size - size;
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newblock->filp = NULL;
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newblock->next = p->next;
newblock->prev = p;
p->next->prev = newblock;
p->next = newblock;
p->size = size;
}
out:
/* Our block is in the middle */
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p->filp = filp;
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return p;
}
static struct mem_block *alloc_block( struct mem_block *heap, int size,
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int align2, DRMFILE filp )
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{
struct mem_block *p;
int mask = (1 << align2)-1;
for (p = heap->next ; p != heap ; p = p->next) {
int start = (p->start + mask) & ~mask;
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if (p->filp == 0 && start + size <= p->start + p->size)
return split_block( p, start, size, filp );
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}
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 )
{
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p->filp = NULL;
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/* Assumes a single contiguous range. Needs a special filp in
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* 'heap' to stop it being subsumed.
*/
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if (p->next->filp == 0) {
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struct mem_block *q = p->next;
p->size += q->size;
p->next = q->next;
p->next->prev = p;
DRM(free)(q, sizeof(*q), DRM_MEM_BUFS );
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}
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if (p->prev->filp == 0) {
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struct mem_block *q = p->prev;
q->size += p->size;
q->next = p->next;
q->next->prev = q;
DRM(free)(p, sizeof(*q), DRM_MEM_BUFS );
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}
}
/* Initialize. How to check for an uninitialized heap?
*/
static int init_heap(struct mem_block **heap, int start, int size)
{
struct mem_block *blocks = DRM(alloc)(sizeof(*blocks), DRM_MEM_BUFS );
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if (!blocks)
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return DRM_ERR(ENOMEM);
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*heap = DRM(alloc)(sizeof(**heap), DRM_MEM_BUFS );
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if (!*heap) {
DRM(free)( blocks, sizeof(*blocks), DRM_MEM_BUFS );
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return DRM_ERR(ENOMEM);
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}
blocks->start = start;
blocks->size = size;
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blocks->filp = NULL;
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blocks->next = blocks->prev = *heap;
memset( *heap, 0, sizeof(**heap) );
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(*heap)->filp = (DRMFILE) -1;
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(*heap)->next = (*heap)->prev = blocks;
return 0;
}
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/* Free all blocks associated with the releasing file.
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*/
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void radeon_mem_release( DRMFILE filp, struct mem_block *heap )
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{
struct mem_block *p;
if (!heap || !heap->next)
return;
for (p = heap->next ; p != heap ; p = p->next) {
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if (p->filp == filp)
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p->filp = NULL;
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}
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/* Assumes a single contiguous range. Needs a special filp in
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* 'heap' to stop it being subsumed.
*/
for (p = heap->next ; p != heap ; p = p->next) {
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while (p->filp == 0 && p->next->filp == 0) {
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struct mem_block *q = p->next;
p->size += q->size;
p->next = q->next;
p->next->prev = p;
DRM(free)(q, sizeof(*q),DRM_MEM_DRIVER);
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}
}
}
/* 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;
DRM(free)(q, sizeof(*q),DRM_MEM_DRIVER);
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}
DRM(free)( *heap, sizeof(**heap),DRM_MEM_DRIVER );
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*heap = NULL;
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}
/* IOCTL HANDLERS */
static struct mem_block **get_heap( drm_radeon_private_t *dev_priv,
int region )
{
switch( region ) {
case RADEON_MEM_REGION_GART:
return &dev_priv->gart_heap;
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case RADEON_MEM_REGION_FB:
return &dev_priv->fb_heap;
default:
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return NULL;
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}
}
int radeon_mem_alloc( DRM_IOCTL_ARGS )
{
DRM_DEVICE;
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 DRM_ERR(EINVAL);
}
DRM_COPY_FROM_USER_IOCTL( alloc, (drm_radeon_mem_alloc_t __user *)data,
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sizeof(alloc) );
heap = get_heap( dev_priv, alloc.region );
if (!heap || !*heap)
return DRM_ERR(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,
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filp );
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if (!block)
return DRM_ERR(ENOMEM);
if ( DRM_COPY_TO_USER( alloc.region_offset, &block->start,
sizeof(int) ) ) {
DRM_ERROR( "copy_to_user\n" );
return DRM_ERR(EFAULT);
}
return 0;
}
int radeon_mem_free( DRM_IOCTL_ARGS )
{
DRM_DEVICE;
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 DRM_ERR(EINVAL);
}
DRM_COPY_FROM_USER_IOCTL( memfree, (drm_radeon_mem_free_t __user *)data,
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sizeof(memfree) );
heap = get_heap( dev_priv, memfree.region );
if (!heap || !*heap)
return DRM_ERR(EFAULT);
block = find_block( *heap, memfree.region_offset );
if (!block)
return DRM_ERR(EFAULT);
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if (block->filp != filp)
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return DRM_ERR(EPERM);
free_block( block );
return 0;
}
int radeon_mem_init_heap( DRM_IOCTL_ARGS )
{
DRM_DEVICE;
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 DRM_ERR(EINVAL);
}
DRM_COPY_FROM_USER_IOCTL( initheap, (drm_radeon_mem_init_heap_t __user *)data,
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sizeof(initheap) );
heap = get_heap( dev_priv, initheap.region );
if (!heap)
return DRM_ERR(EFAULT);
if (*heap) {
DRM_ERROR("heap already initialized?");
return DRM_ERR(EFAULT);
}
return init_heap( heap, initheap.start, initheap.size );
}