diff options
Diffstat (limited to 'drivers/gpu/drm/drm_bufs.c')
| -rw-r--r-- | drivers/gpu/drm/drm_bufs.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_bufs.c b/drivers/gpu/drm/drm_bufs.c index f1a204d253cc..d92db7007f62 100644 --- a/drivers/gpu/drm/drm_bufs.c +++ b/drivers/gpu/drm/drm_bufs.c @@ -416,6 +416,58 @@ int drm_legacy_addmap_ioctl(struct drm_device *dev, void *data, return 0; } +/* + * Get a mapping information. + * + * \param inode device inode. + * \param file_priv DRM file private. + * \param cmd command. + * \param arg user argument, pointing to a drm_map structure. + * + * \return zero on success or a negative number on failure. + * + * Searches for the mapping with the specified offset and copies its information + * into userspace + */ +int drm_legacy_getmap_ioctl(struct drm_device *dev, void *data, + struct drm_file *file_priv) +{ + struct drm_map *map = data; + struct drm_map_list *r_list = NULL; + struct list_head *list; + int idx; + int i; + + idx = map->offset; + if (idx < 0) + return -EINVAL; + + i = 0; + mutex_lock(&dev->struct_mutex); + list_for_each(list, &dev->maplist) { + if (i == idx) { + r_list = list_entry(list, struct drm_map_list, head); + break; + } + i++; + } + if (!r_list || !r_list->map) { + mutex_unlock(&dev->struct_mutex); + return -EINVAL; + } + + map->offset = r_list->map->offset; + map->size = r_list->map->size; + map->type = r_list->map->type; + map->flags = r_list->map->flags; + map->handle = (void *)(unsigned long) r_list->user_token; + map->mtrr = arch_phys_wc_index(r_list->map->mtrr); + + mutex_unlock(&dev->struct_mutex); + + return 0; +} + /** * Remove a map private from list and deallocate resources if the mapping * isn't in use. |