[Xen-devel] [PATCH 06/11] ttm/driver: Expand ttm_backend_func to include two overrides for TTM page pool.

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

The two overrides will be choosen by the backends whether they
want to use a different TTM page pool than the default.

If the backend does not choose a new override, the default one
will be used.

Reviewed-by: Jerome Glisse <jglisse@xxxxxxxxxx>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
 drivers/gpu/drm/ttm/ttm_page_alloc.c |   10 +++++++---
 include/drm/ttm/ttm_bo_driver.h      |   31 +++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c 
b/drivers/gpu/drm/ttm/ttm_page_alloc.c
index 24c0340..360afb3 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c
@@ -861,13 +861,17 @@ EXPORT_SYMBOL(ttm_page_alloc_debugfs);
 int ttm_get_pages(struct ttm_tt *ttm, struct list_head *pages,
                  unsigned count, dma_addr_t *dma_address)
 {
+       if (ttm->be && ttm->be->func && ttm->be->func->get_pages)
+               return ttm->be->func->get_pages(ttm, pages, count, dma_address);
        return __ttm_get_pages(pages, ttm->page_flags, ttm->caching_state,
                                count, dma_address);
 }
-{
 void ttm_put_pages(struct ttm_tt *ttm, struct list_head *pages,
                   unsigned page_count, dma_addr_t *dma_address)
 {
-       __ttm_put_pages(pages, page_count, ttm->page_flags, ttm->caching_state,
-                       dma_address);
+       if (ttm->be && ttm->be->func && ttm->be->func->put_pages)
+               ttm->be->func->put_pages(ttm, pages, page_count, dma_address);
+       else
+               __ttm_put_pages(pages, page_count, ttm->page_flags,
+                               ttm->caching_state, dma_address);
 }
diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index 09af2d7..1826c3b 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -100,6 +100,34 @@ struct ttm_backend_func {
         * Destroy the backend.
         */
        void (*destroy) (struct ttm_backend *backend);
+
+       /**
+        * ttm_get_pages override. The backend can override the default
+        * TTM page pool code with a different one.
+        *
+        * Get count number of pages from pool to pages list.
+        *
+        * @ttm: ttm which contains flags for page allocation and caching state.
+        * @pages: head of empty linked list where pages are filled.
+        * @dma_address: The DMA (bus) address of pages
+        */
+       int (*get_pages) (struct ttm_tt *ttm, struct list_head *pages,
+                         unsigned count, dma_addr_t *dma_address);
+
+       /**
+        * ttm_put_pages override. The backend can override the default
+        * TTM page pool code with a different implementation.
+        *
+        * Put linked list of pages to pool.
+        *
+        * @ttm: ttm which contains flags for page allocation and caching state.
+        * @pages: list of pages to free.
+        * @page_count: number of pages in the list. Zero can be passed for
+        * unknown count.
+        * @dma_address: The DMA (bus) address of pages
+        */
+       void (*put_pages) (struct ttm_tt *ttm, struct list_head *pages,
+                          unsigned page_count, dma_addr_t *dma_address);
 };
 
 /**
@@ -109,6 +137,8 @@ struct ttm_backend_func {
  * @flags: For driver use.
  * @func: Pointer to a struct ttm_backend_func that describes
  * the backend methods.
+ * @dev: Pointer to a struct device which can be used by the TTM
+ *  [get|put)_pages overrides in 'struct ttm_backend_func'.
  *
  */
 
@@ -116,6 +146,7 @@ struct ttm_backend {
        struct ttm_bo_device *bdev;
        uint32_t flags;
        struct ttm_backend_func *func;
+       struct device *dev;
 };
 
 #define TTM_PAGE_FLAG_USER            (1 << 1)
-- 
1.7.6.4


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