android_kernel_xiaomi_sm8350/drivers/char/drm/radeon_mem.c
Harvey Harrison 2b46278b6a drm: radeon: fix sparse integer as NULL pointer warnings in radeon_mem.c
drivers/char/drm/radeon_mem.c:91:23: warning: Using plain integer as NULL pointer
drivers/char/drm/radeon_mem.c:116:28: warning: Using plain integer as NULL pointer
drivers/char/drm/radeon_mem.c:124:28: warning: Using plain integer as NULL pointer
drivers/char/drm/radeon_mem.c:177:26: warning: Using plain integer as NULL pointer
drivers/char/drm/radeon_mem.c:177:53: warning: Using plain integer as NULL pointer

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Airlie <airlied@linux.ie>
2008-03-30 07:56:39 +10:00

303 lines
7.4 KiB
C

/* radeon_mem.c -- Simple GART/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 "drmP.h"
#include "drm.h"
#include "radeon_drm.h"
#include "radeon_drv.h"
/* Very simple allocator for GART 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,
struct drm_file *file_priv)
{
/* Maybe cut off the start of an existing block */
if (start > p->start) {
struct mem_block *newblock =
drm_alloc(sizeof(*newblock), DRM_MEM_BUFS);
if (!newblock)
goto out;
newblock->start = start;
newblock->size = p->size - (start - p->start);
newblock->file_priv = NULL;
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);
if (!newblock)
goto out;
newblock->start = start + size;
newblock->size = p->size - size;
newblock->file_priv = NULL;
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->file_priv = file_priv;
return p;
}
static struct mem_block *alloc_block(struct mem_block *heap, int size,
int align2, struct drm_file *file_priv)
{
struct mem_block *p;
int mask = (1 << align2) - 1;
list_for_each(p, heap) {
int start = (p->start + mask) & ~mask;
if (p->file_priv == NULL && start + size <= p->start + p->size)
return split_block(p, start, size, file_priv);
}
return NULL;
}
static struct mem_block *find_block(struct mem_block *heap, int start)
{
struct mem_block *p;
list_for_each(p, heap)
if (p->start == start)
return p;
return NULL;
}
static void free_block(struct mem_block *p)
{
p->file_priv = NULL;
/* Assumes a single contiguous range. Needs a special file_priv in
* 'heap' to stop it being subsumed.
*/
if (p->next->file_priv == NULL) {
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);
}
if (p->prev->file_priv == NULL) {
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);
}
}
/* 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);
if (!blocks)
return -ENOMEM;
*heap = drm_alloc(sizeof(**heap), DRM_MEM_BUFS);
if (!*heap) {
drm_free(blocks, sizeof(*blocks), DRM_MEM_BUFS);
return -ENOMEM;
}
blocks->start = start;
blocks->size = size;
blocks->file_priv = NULL;
blocks->next = blocks->prev = *heap;
memset(*heap, 0, sizeof(**heap));
(*heap)->file_priv = (struct drm_file *) - 1;
(*heap)->next = (*heap)->prev = blocks;
return 0;
}
/* Free all blocks associated with the releasing file.
*/
void radeon_mem_release(struct drm_file *file_priv, struct mem_block *heap)
{
struct mem_block *p;
if (!heap || !heap->next)
return;
list_for_each(p, heap) {
if (p->file_priv == file_priv)
p->file_priv = NULL;
}
/* Assumes a single contiguous range. Needs a special file_priv in
* 'heap' to stop it being subsumed.
*/
list_for_each(p, heap) {
while (p->file_priv == NULL && p->next->file_priv == NULL) {
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);
}
}
}
/* 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);
}
drm_free(*heap, sizeof(**heap), DRM_MEM_DRIVER);
*heap = NULL;
}
/* 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;
case RADEON_MEM_REGION_FB:
return &dev_priv->fb_heap;
default:
return NULL;
}
}
int radeon_mem_alloc(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
drm_radeon_private_t *dev_priv = dev->dev_private;
drm_radeon_mem_alloc_t *alloc = data;
struct mem_block *block, **heap;
if (!dev_priv) {
DRM_ERROR("called with no initialization\n");
return -EINVAL;
}
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, file_priv);
if (!block)
return -ENOMEM;
if (DRM_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 drm_device *dev, void *data, struct drm_file *file_priv)
{
drm_radeon_private_t *dev_priv = dev->dev_private;
drm_radeon_mem_free_t *memfree = data;
struct mem_block *block, **heap;
if (!dev_priv) {
DRM_ERROR("called with no initialization\n");
return -EINVAL;
}
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->file_priv != file_priv)
return -EPERM;
free_block(block);
return 0;
}
int radeon_mem_init_heap(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
drm_radeon_private_t *dev_priv = dev->dev_private;
drm_radeon_mem_init_heap_t *initheap = data;
struct mem_block **heap;
if (!dev_priv) {
DRM_ERROR("called with no initialization\n");
return -EINVAL;
}
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);
}