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Subject[PATCH 06/11] ttm/driver: Expand ttm_backend_func to include two overrides for TTM page pool.
Date
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@redhat.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
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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