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drm/ttm: expose CPU address of DMA-allocated pages

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Pages allocated using the DMA API have a coherent memory mapping. Make
this mapping visible to drivers so they can decide to use it instead of
creating their own redundant one.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Acked-by: David Airlie <airlied@linux.ie>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Alexandre Courbot 2014-08-04 18:28:54 +09:00 • committed by Ben Skeggs
commit 3d50d4dcb0
3 changed files with 12 additions and 5 deletions
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2
include/drm/ttm/ttm_bo_driver.h
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@ -133,6 +133,7 @@ struct ttm_tt {
* struct ttm_dma_tt
*
* @ttm: Base ttm_tt struct.
* @cpu_address: The CPU address of the pages
* @dma_address: The DMA (bus) addresses of the pages
* @pages_list: used by some page allocation backend
*
@ -142,6 +143,7 @@ struct ttm_tt {
*/
struct ttm_dma_tt {
struct ttm_tt ttm;
void **cpu_address;
dma_addr_t *dma_address;
struct list_head pages_list;
};