drm/ttm: restructure to allow driver to plug in alternate memory manager

Nouveau will need this on GeForce 8 and up to account for the GPU
reordering physical VRAM for some memory types.

Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Acked-by: Thomas Hellström <thellstrom@vmware.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

2 files changed, 21 insertions, 3 deletions

diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index 267a86c74e2e..49b43c23636a 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -102,7 +102,8 @@ struct ttm_bus_placement {
  */
 
 struct ttm_mem_reg {
-        struct drm_mm_node *mm_node;
+        void *mm_node;
+        unsigned long start;
         unsigned long size;
         unsigned long num_pages;
         uint32_t page_alignment;
diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index 6c694d86e03d..e3371dbe6a10 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -203,7 +203,22 @@ struct ttm_tt {
  * It's set up by the ttm_bo_driver::init_mem_type method.
  */
 
+struct ttm_mem_type_manager;
+
+struct ttm_mem_type_manager_func {
+        int  (*init)(struct ttm_mem_type_manager *man, unsigned long p_size);
+        int  (*takedown)(struct ttm_mem_type_manager *man);
+        int  (*get_node)(struct ttm_mem_type_manager *man,
+                         struct ttm_buffer_object *bo,
+                         struct ttm_placement *placement,
+                         struct ttm_mem_reg *mem);
+        void (*put_node)(struct ttm_mem_type_manager *man,
+                         struct ttm_mem_reg *mem);
+        void (*debug)(struct ttm_mem_type_manager *man, const char *prefix);
+};
+
 struct ttm_mem_type_manager {
+        struct ttm_bo_device *bdev;
 
         /*
          * No protection. Constant from start.
@@ -222,8 +237,8 @@ struct ttm_mem_type_manager {
          * TODO: Consider one lru_lock per ttm_mem_type_manager.
          * Plays ill with list removal, though.
          */
-
-        struct drm_mm manager;
+        const struct ttm_mem_type_manager_func *func;
+        void *priv;
         struct list_head lru;
 };
 
@@ -895,6 +910,8 @@ extern int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
  */
 extern pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp);
 
+extern const struct ttm_mem_type_manager_func ttm_bo_manager_func;
+
 #if (defined(CONFIG_AGP) || (defined(CONFIG_AGP_MODULE) && defined(MODULE)))
 #define TTM_HAS_AGP
 #include <linux/agp_backend.h>