ttm: Introduce a placeholder for DMA (bus) addresses.

This is right now limited to only non-pool constructs.

[v2: Fixed indentation issues, add review-by tag]

Reviewed-by: Thomas Hellstrom <thomas@shipmail.org>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Tested-by: Ian Campbell <ian.campbell@citrix.com>

4 files changed, 21 insertions, 7 deletions

diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c b/drivers/gpu/drm/ttm/ttm_page_alloc.c
index b1e02fffd3cc..9d9d92945f8c 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c
@@ -38,6 +38,7 @@
 #include <linux/mm.h>
 #include <linux/seq_file.h> /* for seq_printf */
 #include <linux/slab.h>
+#include <linux/dma-mapping.h>
 
 #include <asm/atomic.h>
 
@@ -662,7 +663,8 @@ out:
  * cached pages.
  */
 int ttm_get_pages(struct list_head *pages, int flags,
-                enum ttm_caching_state cstate, unsigned count)
+                  enum ttm_caching_state cstate, unsigned count,
+                  dma_addr_t *dma_address)
 {
         struct ttm_page_pool *pool = ttm_get_pool(flags, cstate);
         struct page *p = NULL;
@@ -720,7 +722,7 @@ int ttm_get_pages(struct list_head *pages, int flags,
                         printk(KERN_ERR TTM_PFX
                                "Failed to allocate extra pages "
                                "for large request.");
-                        ttm_put_pages(pages, 0, flags, cstate);
+                        ttm_put_pages(pages, 0, flags, cstate, NULL);
                         return r;
                 }
         }
@@ -731,7 +733,7 @@ int ttm_get_pages(struct list_head *pages, int flags,
 
 /* Put all pages in pages list to correct pool to wait for reuse */
 void ttm_put_pages(struct list_head *pages, unsigned page_count, int flags,
-                enum ttm_caching_state cstate)
+                   enum ttm_caching_state cstate, dma_addr_t *dma_address)
 {
         unsigned long irq_flags;
         struct ttm_page_pool *pool = ttm_get_pool(flags, cstate);
diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c
index af789dc869b9..0d39001259fb 100644
--- a/drivers/gpu/drm/ttm/ttm_tt.c
+++ b/drivers/gpu/drm/ttm/ttm_tt.c
@@ -49,12 +49,16 @@ static int ttm_tt_swapin(struct ttm_tt *ttm);
 static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
 {
         ttm->pages = drm_calloc_large(ttm->num_pages, sizeof(*ttm->pages));
+        ttm->dma_address = drm_calloc_large(ttm->num_pages,
+                                            sizeof(*ttm->dma_address));
 }
 
 static void ttm_tt_free_page_directory(struct ttm_tt *ttm)
 {
         drm_free_large(ttm->pages);
         ttm->pages = NULL;
+        drm_free_large(ttm->dma_address);
+        ttm->dma_address = NULL;
 }
 
 static void ttm_tt_free_user_pages(struct ttm_tt *ttm)
@@ -105,7 +109,8 @@ static struct page *__ttm_tt_get_page(struct ttm_tt *ttm, int index)
 
                 INIT_LIST_HEAD(&h);
 
-                ret = ttm_get_pages(&h, ttm->page_flags, ttm->caching_state, 1);
+                ret = ttm_get_pages(&h, ttm->page_flags, ttm->caching_state, 1,
+                                    &ttm->dma_address[index]);
 
                 if (ret != 0)
                         return NULL;
@@ -298,7 +303,8 @@ static void ttm_tt_free_alloced_pages(struct ttm_tt *ttm)
                         count++;
                 }
         }
-        ttm_put_pages(&h, count, ttm->page_flags, ttm->caching_state);
+        ttm_put_pages(&h, count, ttm->page_flags, ttm->caching_state,
+                      ttm->dma_address);
         ttm->state = tt_unpopulated;
         ttm->first_himem_page = ttm->num_pages;
         ttm->last_lomem_page = -1;
diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index 8e0c848326b6..6dc4fccda73c 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -149,6 +149,7 @@ enum ttm_caching_state {
  * @swap_storage: Pointer to shmem struct file for swap storage.
  * @caching_state: The current caching state of the pages.
  * @state: The current binding state of the pages.
+ * @dma_address: The DMA (bus) addresses of the pages (if TTM_PAGE_FLAG_DMA32)
  *
  * This is a structure holding the pages, caching- and aperture binding
  * status for a buffer object that isn't backed by fixed (VRAM / AGP)
@@ -173,6 +174,7 @@ struct ttm_tt {
                 tt_unbound,
                 tt_unpopulated,
         } state;
+        dma_addr_t *dma_address;
 };
 
 #define TTM_MEMTYPE_FLAG_FIXED         (1 << 0) /* Fixed (on-card) PCI memory */
diff --git a/include/drm/ttm/ttm_page_alloc.h b/include/drm/ttm/ttm_page_alloc.h
index 116821448c38..8062890f725e 100644
--- a/include/drm/ttm/ttm_page_alloc.h
+++ b/include/drm/ttm/ttm_page_alloc.h
@@ -36,11 +36,13 @@
  * @flags: ttm flags for page allocation.
  * @cstate: ttm caching state for the page.
  * @count: number of pages to allocate.
+ * @dma_address: The DMA (bus) address of pages (if TTM_PAGE_FLAG_DMA32 set).
  */
 int ttm_get_pages(struct list_head *pages,
                   int flags,
                   enum ttm_caching_state cstate,
-                  unsigned count);
+                  unsigned count,
+                  dma_addr_t *dma_address);
 /**
  * Put linked list of pages to pool.
  *
@@ -49,11 +51,13 @@ int ttm_get_pages(struct list_head *pages,
  * count.
  * @flags: ttm flags for page allocation.
  * @cstate: ttm caching state.
+ * @dma_address: The DMA (bus) address of pages (if TTM_PAGE_FLAG_DMA32 set).
  */
 void ttm_put_pages(struct list_head *pages,
                    unsigned page_count,
                    int flags,
-                   enum ttm_caching_state cstate);
+                   enum ttm_caching_state cstate,
+                   dma_addr_t *dma_address);
 /**
  * Initialize pool allocator.
  */