drm/ttm: merge ttm_backend and ttm_tt V5

ttm_backend will only exist with a ttm_tt, and ttm_tt
will only be of interest when bound to a backend. Merge them
to avoid code and data duplication.

V2 Rebase on top of memory accounting overhaul
V3 Rebase on top of more memory accounting changes
V4 Rebase on top of no memory account changes (where/when is my
   delorean when i need it ?)
V5 make sure ttm is unbound before destroying, change commit
   message on suggestion from Tormod Volden

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

1 files changed, 41 insertions, 63 deletions

diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index 6d17140..6b8c5cd 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -43,36 +43,9 @@ struct ttm_backend;
 
 struct ttm_backend_func {
 	/**
-	 * struct ttm_backend_func member populate
-	 *
-	 * @backend: Pointer to a struct ttm_backend.
-	 * @num_pages: Number of pages to populate.
-	 * @pages: Array of pointers to ttm pages.
-	 * @dummy_read_page: Page to be used instead of NULL pages in the
-	 * array @pages.
-	 * @dma_addrs: Array of DMA (bus) address of the ttm pages.
-	 *
-	 * Populate the backend with ttm pages. Depending on the backend,
-	 * it may or may not copy the @pages array.
-	 */
-	int (*populate) (struct ttm_backend *backend,
-			 unsigned long num_pages, struct page **pages,
-			 struct page *dummy_read_page,
-			 dma_addr_t *dma_addrs);
-	/**
-	 * struct ttm_backend_func member clear
-	 *
-	 * @backend: Pointer to a struct ttm_backend.
-	 *
-	 * This is an "unpopulate" function. Release all resources
-	 * allocated with populate.
-	 */
-	void (*clear) (struct ttm_backend *backend);
-
-	/**
 	 * struct ttm_backend_func member bind
 	 *
-	 * @backend: Pointer to a struct ttm_backend.
+	 * @ttm: Pointer to a struct ttm_tt.
 	 * @bo_mem: Pointer to a struct ttm_mem_reg describing the
 	 * memory type and location for binding.
 	 *
@@ -80,40 +53,27 @@ struct ttm_backend_func {
 	 * indicated by @bo_mem. This function should be able to handle
 	 * differences between aperture and system page sizes.
 	 */
-	int (*bind) (struct ttm_backend *backend, struct ttm_mem_reg *bo_mem);
+	int (*bind) (struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem);
 
 	/**
 	 * struct ttm_backend_func member unbind
 	 *
-	 * @backend: Pointer to a struct ttm_backend.
+	 * @ttm: Pointer to a struct ttm_tt.
 	 *
 	 * Unbind previously bound backend pages. This function should be
 	 * able to handle differences between aperture and system page sizes.
 	 */
-	int (*unbind) (struct ttm_backend *backend);
+	int (*unbind) (struct ttm_tt *ttm);
 
 	/**
 	 * struct ttm_backend_func member destroy
 	 *
-	 * @backend: Pointer to a struct ttm_backend.
+	 * @ttm: Pointer to a struct ttm_tt.
 	 *
-	 * Destroy the backend.
+	 * Destroy the backend. This will be call back from ttm_tt_destroy so
+	 * don't call ttm_tt_destroy from the callback or infinite loop.
 	 */
-	void (*destroy) (struct ttm_backend *backend);
-};
-
-/**
- * struct ttm_backend
- *
- * @bdev: Pointer to a struct ttm_bo_device.
- * @func: Pointer to a struct ttm_backend_func that describes
- * the backend methods.
- *
- */
-
-struct ttm_backend {
-	struct ttm_bo_device *bdev;
-	struct ttm_backend_func *func;
+	void (*destroy) (struct ttm_tt *ttm);
 };
 
 #define TTM_PAGE_FLAG_WRITE           (1 << 3)
@@ -131,6 +91,9 @@ enum ttm_caching_state {
 /**
  * struct ttm_tt
  *
+ * @bdev: Pointer to a struct ttm_bo_device.
+ * @func: Pointer to a struct ttm_backend_func that describes
+ * the backend methods.
  * @dummy_read_page: Page to map where the ttm_tt page array contains a NULL
  * pointer.
  * @pages: Array of pages backing the data.
@@ -148,6 +111,8 @@ enum ttm_caching_state {
  */
 
 struct ttm_tt {
+	struct ttm_bo_device *bdev;
+	struct ttm_backend_func *func;
 	struct page *dummy_read_page;
 	struct page **pages;
 	uint32_t page_flags;
@@ -336,15 +301,22 @@ struct ttm_mem_type_manager {
 
 struct ttm_bo_driver {
 	/**
-	 * struct ttm_bo_driver member create_ttm_backend_entry
+	 * ttm_tt_create
 	 *
-	 * @bdev: The buffer object device.
+	 * @bdev: pointer to a struct ttm_bo_device:
+	 * @size: Size of the data needed backing.
+	 * @page_flags: Page flags as identified by TTM_PAGE_FLAG_XX flags.
+	 * @dummy_read_page: See struct ttm_bo_device.
 	 *
-	 * Create a driver specific struct ttm_backend.
+	 * Create a struct ttm_tt to back data with system memory pages.
+	 * No pages are actually allocated.
+	 * Returns:
+	 * NULL: Out of memory.
 	 */
-
-	struct ttm_backend *(*create_ttm_backend_entry)
-	 (struct ttm_bo_device *bdev);
+	struct ttm_tt *(*ttm_tt_create)(struct ttm_bo_device *bdev,
+					unsigned long size,
+					uint32_t page_flags,
+					struct page *dummy_read_page);
 
 	/**
 	 * struct ttm_bo_driver member invalidate_caches
@@ -585,8 +557,9 @@ ttm_flag_masked(uint32_t *old, uint32_t new, uint32_t mask)
 }
 
 /**
- * ttm_tt_create
+ * ttm_tt_init
  *
+ * @ttm: The struct ttm_tt.
  * @bdev: pointer to a struct ttm_bo_device:
  * @size: Size of the data needed backing.
  * @page_flags: Page flags as identified by TTM_PAGE_FLAG_XX flags.
@@ -597,10 +570,9 @@ ttm_flag_masked(uint32_t *old, uint32_t new, uint32_t mask)
  * Returns:
  * NULL: Out of memory.
  */
-extern struct ttm_tt *ttm_tt_create(struct ttm_bo_device *bdev,
-				    unsigned long size,
-				    uint32_t page_flags,
-				    struct page *dummy_read_page);
+extern int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev,
+			unsigned long size, uint32_t page_flags,
+			struct page *dummy_read_page);
 
 /**
  * ttm_ttm_bind:
@@ -626,7 +598,7 @@ extern int ttm_tt_populate(struct ttm_tt *ttm);
  *
  * @ttm: The struct ttm_tt.
  *
- * Unbind, unpopulate and destroy a struct ttm_tt.
+ * Unbind, unpopulate and destroy common struct ttm_tt.
  */
 extern void ttm_tt_destroy(struct ttm_tt *ttm);
 
@@ -1013,17 +985,23 @@ extern const struct ttm_mem_type_manager_func ttm_bo_manager_func;
 #include <linux/agp_backend.h>
 
 /**
- * ttm_agp_backend_init
+ * ttm_agp_tt_create
  *
  * @bdev: Pointer to a struct ttm_bo_device.
  * @bridge: The agp bridge this device is sitting on.
+ * @size: Size of the data needed backing.
+ * @page_flags: Page flags as identified by TTM_PAGE_FLAG_XX flags.
+ * @dummy_read_page: See struct ttm_bo_device.
+ *
  *
  * Create a TTM backend that uses the indicated AGP bridge as an aperture
  * for TT memory. This function uses the linux agpgart interface to
  * bind and unbind memory backing a ttm_tt.
  */
-extern struct ttm_backend *ttm_agp_backend_init(struct ttm_bo_device *bdev,
-						struct agp_bridge_data *bridge);
+extern struct ttm_tt *ttm_agp_tt_create(struct ttm_bo_device *bdev,
+					struct agp_bridge_data *bridge,
+					unsigned long size, uint32_t page_flags,
+					struct page *dummy_read_page);
 #endif
 
 #endif