drm: Move drm_getmap into drm_bufs.c and give it a legacy prefix

It belongs right next to the addmap and rmmap functions really. And
for OCD consistency name it drm_legacy_getmap_ioctl.

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1461691808-12414-4-git-send-email-daniel.vetter@ffwll.ch

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.