diff options
| author | Alexandre Courbot <acourbot@nvidia.com> | 2014-08-04 13:28:54 +0400 |
|---|---|---|
| committer | Ben Skeggs <bskeggs@redhat.com> | 2014-08-09 19:08:03 +0400 |
| commit | 3d50d4dcb0c4e0e01f45ae15df34ab6a04fb35bb (patch) | |
| tree | e4185162685c07ad2b592cf7c6bcb882cfb660e4 /drivers/gpu/drm/ttm/ttm_tt.c | |
| parent | 7963e9db1b1f842fdc53309baa8714d38e9f5681 (diff) | |
| download | linux-3d50d4dcb0c4e0e01f45ae15df34ab6a04fb35bb.tar.xz | |
drm/ttm: expose CPU address of DMA-allocated pages
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>
Diffstat (limited to 'drivers/gpu/drm/ttm/ttm_tt.c')
| -rw-r--r-- | drivers/gpu/drm/ttm/ttm_tt.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c index 75f319090043..bf080abc86d1 100644 --- a/drivers/gpu/drm/ttm/ttm_tt.c +++ b/drivers/gpu/drm/ttm/ttm_tt.c @@ -55,9 +55,12 @@ static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm) static void ttm_dma_tt_alloc_page_directory(struct ttm_dma_tt *ttm) { - ttm->ttm.pages = drm_calloc_large(ttm->ttm.num_pages, sizeof(void*)); - ttm->dma_address = drm_calloc_large(ttm->ttm.num_pages, - sizeof(*ttm->dma_address)); + ttm->ttm.pages = drm_calloc_large(ttm->ttm.num_pages, + sizeof(*ttm->ttm.pages) + + sizeof(*ttm->dma_address) + + sizeof(*ttm->cpu_address)); + ttm->cpu_address = (void *) (ttm->ttm.pages + ttm->ttm.num_pages); + ttm->dma_address = (void *) (ttm->cpu_address + ttm->ttm.num_pages); } #ifdef CONFIG_X86 @@ -228,7 +231,7 @@ int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev, INIT_LIST_HEAD(&ttm_dma->pages_list); ttm_dma_tt_alloc_page_directory(ttm_dma); - if (!ttm->pages || !ttm_dma->dma_address) { + if (!ttm->pages) { ttm_tt_destroy(ttm); pr_err("Failed allocating page table\n"); return -ENOMEM; @@ -243,7 +246,7 @@ void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma) drm_free_large(ttm->pages); ttm->pages = NULL; - drm_free_large(ttm_dma->dma_address); + ttm_dma->cpu_address = NULL; ttm_dma->dma_address = NULL; } EXPORT_SYMBOL(ttm_dma_tt_fini); |