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linux/drivers/char/drm/via_mm.c
Alexey Dobriyan bbaf364103 [PATCH] drm: via: fix sparse warnings 
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Dave Airlie <airlied@linux.ie>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-07-27 16:25:54 -07:00

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/*
* Copyright 1998-2003 VIA Technologies, Inc. All Rights Reserved.
* Copyright 2001-2003 S3 Graphics, Inc. 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, sub license,
* 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 NON-INFRINGEMENT. IN NO EVENT SHALL
* VIA, S3 GRAPHICS, 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.
*/
#include "drmP.h"
#include "via_drm.h"
#include "via_drv.h"
#include "via_ds.h"
#include "via_mm.h"
#define MAX_CONTEXT 100
typedef struct {
int used;
int context;
set_t *sets[2]; /* 0 for frame buffer, 1 for AGP , 2 for System */
} via_context_t;
static via_context_t global_ppriv[MAX_CONTEXT];
static int via_agp_alloc(drm_via_mem_t * mem);
static int via_agp_free(drm_via_mem_t * mem);
static int via_fb_alloc(drm_via_mem_t * mem);
static int via_fb_free(drm_via_mem_t * mem);
static int add_alloc_set(int context, int type, unsigned int val)
{
int i, retval = 0;
for (i = 0; i < MAX_CONTEXT; i++) {
if (global_ppriv[i].used && global_ppriv[i].context == context) {
retval = via_setAdd(global_ppriv[i].sets[type], val);
break;
}
}
return retval;
}
static int del_alloc_set(int context, int type, unsigned int val)
{
int i, retval = 0;
for (i = 0; i < MAX_CONTEXT; i++)
if (global_ppriv[i].used && global_ppriv[i].context == context) {
retval = via_setDel(global_ppriv[i].sets[type], val);
break;
}
return retval;
}
/* agp memory management */
static memHeap_t *AgpHeap = NULL;
int via_agp_init(DRM_IOCTL_ARGS)
{
drm_via_agp_t agp;
DRM_COPY_FROM_USER_IOCTL(agp, (drm_via_agp_t __user *) data,
sizeof(agp));
AgpHeap = via_mmInit(agp.offset, agp.size);
DRM_DEBUG("offset = %lu, size = %lu", (unsigned long)agp.offset, (unsigned long)agp.size);
return 0;
}
/* fb memory management */
static memHeap_t *FBHeap = NULL;
int via_fb_init(DRM_IOCTL_ARGS)
{
drm_via_fb_t fb;
DRM_COPY_FROM_USER_IOCTL(fb, (drm_via_fb_t __user *) data, sizeof(fb));
FBHeap = via_mmInit(fb.offset, fb.size);
DRM_DEBUG("offset = %lu, size = %lu", (unsigned long)fb.offset, (unsigned long)fb.size);
return 0;
}
int via_init_context(struct drm_device *dev, int context)
{
int i;
for (i = 0; i < MAX_CONTEXT; i++)
if (global_ppriv[i].used &&
(global_ppriv[i].context == context))
break;
if (i >= MAX_CONTEXT) {
for (i = 0; i < MAX_CONTEXT; i++) {
if (!global_ppriv[i].used) {
global_ppriv[i].context = context;
global_ppriv[i].used = 1;
global_ppriv[i].sets[0] = via_setInit();
global_ppriv[i].sets[1] = via_setInit();
DRM_DEBUG("init allocation set, socket=%d,"
" context = %d\n", i, context);
break;
}
}
if ((i >= MAX_CONTEXT) || (global_ppriv[i].sets[0] == NULL) ||
(global_ppriv[i].sets[1] == NULL)) {
return 0;
}
}
return 1;
}
int via_final_context(struct drm_device *dev, int context)
{
int i;
drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
for (i = 0; i < MAX_CONTEXT; i++)
if (global_ppriv[i].used &&
(global_ppriv[i].context == context))
break;
if (i < MAX_CONTEXT) {
set_t *set;
ITEM_TYPE item;
int retval;
DRM_DEBUG("find socket %d, context = %d\n", i, context);
/* Video Memory */
set = global_ppriv[i].sets[0];
retval = via_setFirst(set, &item);
while (retval) {
DRM_DEBUG("free video memory 0x%lx\n", item);
via_mmFreeMem((PMemBlock) item);
retval = via_setNext(set, &item);
}
via_setDestroy(set);
/* AGP Memory */
set = global_ppriv[i].sets[1];
retval = via_setFirst(set, &item);
while (retval) {
DRM_DEBUG("free agp memory 0x%lx\n", item);
via_mmFreeMem((PMemBlock) item);
retval = via_setNext(set, &item);
}
via_setDestroy(set);
global_ppriv[i].used = 0;
}
via_release_futex(dev_priv, context);
#if defined(__linux__)
/* Linux specific until context tracking code gets ported to BSD */
/* Last context, perform cleanup */
if (dev->ctx_count == 1 && dev->dev_private) {
DRM_DEBUG("Last Context\n");
if (dev->irq)
drm_irq_uninstall(dev);
via_cleanup_futex(dev_priv);
via_do_cleanup_map(dev);
}
#endif
return 1;
}
int via_mem_alloc(DRM_IOCTL_ARGS)
{
drm_via_mem_t mem;
DRM_COPY_FROM_USER_IOCTL(mem, (drm_via_mem_t __user *) data,
sizeof(mem));
switch (mem.type) {
case VIDEO:
if (via_fb_alloc(&mem) < 0)
return -EFAULT;
DRM_COPY_TO_USER_IOCTL((drm_via_mem_t __user *) data, mem,
sizeof(mem));
return 0;
case AGP:
if (via_agp_alloc(&mem) < 0)
return -EFAULT;
DRM_COPY_TO_USER_IOCTL((drm_via_mem_t __user *) data, mem,
sizeof(mem));
return 0;
}
return -EFAULT;
}
static int via_fb_alloc(drm_via_mem_t * mem)
{
drm_via_mm_t fb;
PMemBlock block;
int retval = 0;
if (!FBHeap)
return -1;
fb.size = mem->size;
fb.context = mem->context;
block = via_mmAllocMem(FBHeap, fb.size, 5, 0);
if (block) {
fb.offset = block->ofs;
fb.free = (unsigned long)block;
if (!add_alloc_set(fb.context, VIDEO, fb.free)) {
DRM_DEBUG("adding to allocation set fails\n");
via_mmFreeMem((PMemBlock) fb.free);
retval = -1;
}
} else {
fb.offset = 0;
fb.size = 0;
fb.free = 0;
retval = -1;
}
mem->offset = fb.offset;
mem->index = fb.free;
DRM_DEBUG("alloc fb, size = %d, offset = %d\n", fb.size,
(int)fb.offset);
return retval;
}
static int via_agp_alloc(drm_via_mem_t * mem)
{
drm_via_mm_t agp;
PMemBlock block;
int retval = 0;
if (!AgpHeap)
return -1;
agp.size = mem->size;
agp.context = mem->context;
block = via_mmAllocMem(AgpHeap, agp.size, 5, 0);
if (block) {
agp.offset = block->ofs;
agp.free = (unsigned long)block;
if (!add_alloc_set(agp.context, AGP, agp.free)) {
DRM_DEBUG("adding to allocation set fails\n");
via_mmFreeMem((PMemBlock) agp.free);
retval = -1;
}
} else {
agp.offset = 0;
agp.size = 0;
agp.free = 0;
}
mem->offset = agp.offset;
mem->index = agp.free;
DRM_DEBUG("alloc agp, size = %d, offset = %d\n", agp.size,
(unsigned int)agp.offset);
return retval;
}
int via_mem_free(DRM_IOCTL_ARGS)
{
drm_via_mem_t mem;
DRM_COPY_FROM_USER_IOCTL(mem, (drm_via_mem_t __user *) data,
sizeof(mem));
switch (mem.type) {
case VIDEO:
if (via_fb_free(&mem) == 0)
return 0;
break;
case AGP:
if (via_agp_free(&mem) == 0)
return 0;
break;
}
return -EFAULT;
}
static int via_fb_free(drm_via_mem_t * mem)
{
drm_via_mm_t fb;
int retval = 0;
if (!FBHeap) {
return -1;
}
fb.free = mem->index;
fb.context = mem->context;
if (!fb.free) {
return -1;
}
via_mmFreeMem((PMemBlock) fb.free);
if (!del_alloc_set(fb.context, VIDEO, fb.free)) {
retval = -1;
}
DRM_DEBUG("free fb, free = %ld\n", fb.free);
return retval;
}
static int via_agp_free(drm_via_mem_t * mem)
{
drm_via_mm_t agp;
int retval = 0;
agp.free = mem->index;
agp.context = mem->context;
if (!agp.free)
return -1;
via_mmFreeMem((PMemBlock) agp.free);
if (!del_alloc_set(agp.context, AGP, agp.free)) {
retval = -1;
}
DRM_DEBUG("free agp, free = %ld\n", agp.free);
return retval;
}
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