diff options
| author | Christian König <christian.koenig@amd.com> | 2018-02-23 17:12:00 +0300 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2018-03-14 22:38:24 +0300 |
| commit | 75a57669cbc881032c60615a31bfc6bfab4c813c (patch) | |
| tree | e661f838d1097ca040d1f47b40c6425f4bcdde6b /drivers/gpu/drm/ttm | |
| parent | 81f5ec025514865fb930d3a665a10a339b113da8 (diff) | |
| download | linux-75a57669cbc881032c60615a31bfc6bfab4c813c.tar.xz | |
drm/ttm: add ttm_sg_tt_init
This allows drivers to only allocate dma addresses, but not a page
array.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Roger He <Hongbo.He@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/ttm')
| -rw-r--r-- | drivers/gpu/drm/ttm/ttm_tt.c | 54 |
1 files changed, 45 insertions, 9 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c index 8e0b525cda00..971133106ec2 100644 --- a/drivers/gpu/drm/ttm/ttm_tt.c +++ b/drivers/gpu/drm/ttm/ttm_tt.c @@ -108,6 +108,16 @@ static int ttm_dma_tt_alloc_page_directory(struct ttm_dma_tt *ttm) return 0; } +static int ttm_sg_tt_alloc_page_directory(struct ttm_dma_tt *ttm) +{ + ttm->dma_address = kvmalloc_array(ttm->ttm.num_pages, + sizeof(*ttm->dma_address), + GFP_KERNEL | __GFP_ZERO); + if (!ttm->dma_address) + return -ENOMEM; + return 0; +} + #ifdef CONFIG_X86 static inline int ttm_tt_set_page_caching(struct page *p, enum ttm_caching_state c_old, @@ -227,8 +237,8 @@ void ttm_tt_destroy(struct ttm_tt *ttm) ttm->func->destroy(ttm); } -int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev, - unsigned long size, uint32_t page_flags) +void ttm_tt_init_fields(struct ttm_tt *ttm, struct ttm_bo_device *bdev, + unsigned long size, uint32_t page_flags) { ttm->bdev = bdev; ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; @@ -236,6 +246,12 @@ int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev, ttm->page_flags = page_flags; ttm->state = tt_unpopulated; ttm->swap_storage = NULL; +} + +int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev, + unsigned long size, uint32_t page_flags) +{ + ttm_tt_init_fields(ttm, bdev, size, page_flags); if (ttm_tt_alloc_page_directory(ttm)) { ttm_tt_destroy(ttm); @@ -258,12 +274,7 @@ int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev, { struct ttm_tt *ttm = &ttm_dma->ttm; - ttm->bdev = bdev; - ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; - ttm->caching_state = tt_cached; - ttm->page_flags = page_flags; - ttm->state = tt_unpopulated; - ttm->swap_storage = NULL; + ttm_tt_init_fields(ttm, bdev, size, page_flags); INIT_LIST_HEAD(&ttm_dma->pages_list); if (ttm_dma_tt_alloc_page_directory(ttm_dma)) { @@ -275,11 +286,36 @@ int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev, } EXPORT_SYMBOL(ttm_dma_tt_init); +int ttm_sg_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev, + unsigned long size, uint32_t page_flags) +{ + struct ttm_tt *ttm = &ttm_dma->ttm; + int ret; + + ttm_tt_init_fields(ttm, bdev, size, page_flags); + + INIT_LIST_HEAD(&ttm_dma->pages_list); + if (page_flags & TTM_PAGE_FLAG_SG) + ret = ttm_sg_tt_alloc_page_directory(ttm_dma); + else + ret = ttm_dma_tt_alloc_page_directory(ttm_dma); + if (ret) { + ttm_tt_destroy(ttm); + pr_err("Failed allocating page table\n"); + return -ENOMEM; + } + return 0; +} +EXPORT_SYMBOL(ttm_sg_tt_init); + void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma) { struct ttm_tt *ttm = &ttm_dma->ttm; - kvfree(ttm->pages); + if (ttm->pages) + kvfree(ttm->pages); + else + kvfree(ttm_dma->dma_address); ttm->pages = NULL; ttm_dma->dma_address = NULL; } |