drm/ttm: introduce callback for ttm_tt populate & unpopulate V4

Move the page allocation and freeing to driver callback and
provide ttm code helper function for those.

Most intrusive change, is the fact that we now only fully
populate an object this simplify some of code designed around
the page fault design.

V2 Rebase on top of memory accounting overhaul
V3 New rebase on top of more memory accouting changes
V4 Rebase on top of no memory account changes (where/when is my
   delorean when i need it ?)

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>

2 files changed, 41 insertions, 18 deletions

diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index 6b8c5cd690a0..ae06e421cf90 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -319,6 +319,26 @@ struct ttm_bo_driver {
                                         struct page *dummy_read_page);
 
         /**
+         * ttm_tt_populate
+         *
+         * @ttm: The struct ttm_tt to contain the backing pages.
+         *
+         * Allocate all backing pages
+         * Returns:
+         * -ENOMEM: Out of memory.
+         */
+        int (*ttm_tt_populate)(struct ttm_tt *ttm);
+
+        /**
+         * ttm_tt_unpopulate
+         *
+         * @ttm: The struct ttm_tt to contain the backing pages.
+         *
+         * Free all backing page
+         */
+        void (*ttm_tt_unpopulate)(struct ttm_tt *ttm);
+
+        /**
          * struct ttm_bo_driver member invalidate_caches
          *
          * @bdev: the buffer object device.
@@ -585,15 +605,6 @@ extern int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev,
 extern int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem);
 
 /**
- * ttm_tt_populate:
- *
- * @ttm: The struct ttm_tt to contain the backing pages.
- *
- * Add backing pages to all of @ttm
- */
-extern int ttm_tt_populate(struct ttm_tt *ttm);
-
-/**
  * ttm_ttm_destroy:
  *
  * @ttm: The struct ttm_tt.
@@ -612,19 +623,13 @@ extern void ttm_tt_destroy(struct ttm_tt *ttm);
 extern void ttm_tt_unbind(struct ttm_tt *ttm);
 
 /**
- * ttm_ttm_destroy:
+ * ttm_tt_swapin:
  *
  * @ttm: The struct ttm_tt.
- * @index: Index of the desired page.
  *
- * Return a pointer to the struct page backing @ttm at page
- * index @index. If the page is unpopulated, one will be allocated to
- * populate that index.
- *
- * Returns:
- * NULL on OOM.
+ * Swap in a previously swap out ttm_tt.
  */
-extern struct page *ttm_tt_get_page(struct ttm_tt *ttm, int index);
+extern int ttm_tt_swapin(struct ttm_tt *ttm);
 
 /**
  * ttm_tt_cache_flush:
diff --git a/include/drm/ttm/ttm_page_alloc.h b/include/drm/ttm/ttm_page_alloc.h
index fe61c8d85684..18deeee23494 100644
--- a/include/drm/ttm/ttm_page_alloc.h
+++ b/include/drm/ttm/ttm_page_alloc.h
@@ -68,6 +68,24 @@ int ttm_page_alloc_init(struct ttm_mem_global *glob, unsigned max_pages);
 void ttm_page_alloc_fini(void);
 
 /**
+ * ttm_pool_populate:
+ *
+ * @ttm: The struct ttm_tt to contain the backing pages.
+ *
+ * Add backing pages to all of @ttm
+ */
+extern int ttm_pool_populate(struct ttm_tt *ttm);
+
+/**
+ * ttm_pool_unpopulate:
+ *
+ * @ttm: The struct ttm_tt which to free backing pages.
+ *
+ * Free all pages of @ttm
+ */
+extern void ttm_pool_unpopulate(struct ttm_tt *ttm);
+
+/**
  * Output the state of pools to debugfs file
  */
 extern int ttm_page_alloc_debugfs(struct seq_file *m, void *data);