drm: bring bufs code from git tree.
This checks the AGP mappings are in a valid place and also fixes the size
check in the vm..
Signed-off-by: Dave Airlie <airlied@linux.ie>
diff --git a/drivers/char/drm/drm_bufs.c b/drivers/char/drm/drm_bufs.c
index a6828cc..c113458 100644
--- a/drivers/char/drm/drm_bufs.c
+++ b/drivers/char/drm/drm_bufs.c
@@ -57,7 +57,8 @@
list_for_each(list, &dev->maplist->head) {
drm_map_list_t *entry = list_entry(list, drm_map_list_t, head);
if (entry->map && map->type == entry->map->type &&
- entry->map->offset == map->offset) {
+ ((entry->map->offset == map->offset) ||
+ (map->type == _DRM_SHM && map->flags==_DRM_CONTAINS_LOCK))) {
return entry;
}
}
@@ -180,8 +181,20 @@
if (map->type == _DRM_REGISTERS)
map->handle = ioremap(map->offset, map->size);
break;
-
case _DRM_SHM:
+ list = drm_find_matching_map(dev, map);
+ if (list != NULL) {
+ if(list->map->size != map->size) {
+ DRM_DEBUG("Matching maps of type %d with "
+ "mismatched sizes, (%ld vs %ld)\n",
+ map->type, map->size, list->map->size);
+ list->map->size = map->size;
+ }
+
+ drm_free(map, sizeof(*map), DRM_MEM_MAPS);
+ *maplist = list;
+ return 0;
+ }
map->handle = vmalloc_user(map->size);
DRM_DEBUG("%lu %d %p\n",
map->size, drm_order(map->size), map->handle);
@@ -200,15 +213,45 @@
dev->sigdata.lock = dev->lock.hw_lock = map->handle; /* Pointer to lock */
}
break;
- case _DRM_AGP:
- if (drm_core_has_AGP(dev)) {
-#ifdef __alpha__
- map->offset += dev->hose->mem_space->start;
-#endif
- map->offset += dev->agp->base;
- map->mtrr = dev->agp->agp_mtrr; /* for getmap */
+ case _DRM_AGP: {
+ drm_agp_mem_t *entry;
+ int valid = 0;
+
+ if (!drm_core_has_AGP(dev)) {
+ drm_free(map, sizeof(*map), DRM_MEM_MAPS);
+ return -EINVAL;
}
+#ifdef __alpha__
+ map->offset += dev->hose->mem_space->start;
+#endif
+ /* Note: dev->agp->base may actually be 0 when the DRM
+ * is not in control of AGP space. But if user space is
+ * it should already have added the AGP base itself.
+ */
+ map->offset += dev->agp->base;
+ map->mtrr = dev->agp->agp_mtrr; /* for getmap */
+
+ /* This assumes the DRM is in total control of AGP space.
+ * It's not always the case as AGP can be in the control
+ * of user space (i.e. i810 driver). So this loop will get
+ * skipped and we double check that dev->agp->memory is
+ * actually set as well as being invalid before EPERM'ing
+ */
+ for (entry = dev->agp->memory; entry; entry = entry->next) {
+ if ((map->offset >= entry->bound) &&
+ (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
+ valid = 1;
+ break;
+ }
+ }
+ if (dev->agp->memory && !valid) {
+ drm_free(map, sizeof(*map), DRM_MEM_MAPS);
+ return -EPERM;
+ }
+ DRM_DEBUG("AGP offset = 0x%08lx, size = 0x%08lx\n", map->offset, map->size);
+
break;
+ }
case _DRM_SCATTER_GATHER:
if (!dev->sg) {
drm_free(map, sizeof(*map), DRM_MEM_MAPS);
@@ -267,7 +310,7 @@
*maplist = list;
return 0;
-}
+ }
int drm_addmap(drm_device_t * dev, unsigned int offset,
unsigned int size, drm_map_type_t type,
@@ -519,6 +562,7 @@
{
drm_device_dma_t *dma = dev->dma;
drm_buf_entry_t *entry;
+ drm_agp_mem_t *agp_entry;
drm_buf_t *buf;
unsigned long offset;
unsigned long agp_offset;
@@ -529,7 +573,7 @@
int page_order;
int total;
int byte_count;
- int i;
+ int i, valid;
drm_buf_t **temp_buflist;
if (!dma)
@@ -560,6 +604,19 @@
if (dev->queue_count)
return -EBUSY; /* Not while in use */
+ /* Make sure buffers are located in AGP memory that we own */
+ valid = 0;
+ for (agp_entry = dev->agp->memory; agp_entry; agp_entry = agp_entry->next) {
+ if ((agp_offset >= agp_entry->bound) &&
+ (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
+ valid = 1;
+ break;
+ }
+ }
+ if (dev->agp->memory && !valid) {
+ DRM_DEBUG("zone invalid\n");
+ return -EINVAL;
+ }
spin_lock(&dev->count_lock);
if (dev->buf_use) {
spin_unlock(&dev->count_lock);