diff options
| -rw-r--r-- | drivers/gpu/drm/ttm/ttm_bo_util.c | 31 | ||||
| -rw-r--r-- | include/drm/ttm/ttm_bo_api.h | 4 |
2 files changed, 30 insertions, 5 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c index 11f27db58abe..2ebbae6067ab 100644 --- a/drivers/gpu/drm/ttm/ttm_bo_util.c +++ b/drivers/gpu/drm/ttm/ttm_bo_util.c @@ -263,24 +263,45 @@ static int ttm_copy_io_page(void *dst, void *src, unsigned long page) #define __ttm_kunmap_atomic(__addr) vunmap(__addr) #endif -static void *ttm_kmap_atomic_prot(struct page *page, - pgprot_t prot) + +/** + * ttm_kmap_atomic_prot - Efficient kernel map of a single page with + * specified page protection. + * + * @page: The page to map. + * @prot: The page protection. + * + * This function maps a TTM page using the kmap_atomic api if available, + * otherwise falls back to vmap. The user must make sure that the + * specified page does not have an aliased mapping with a different caching + * policy unless the architecture explicitly allows it. Also mapping and + * unmapping using this api must be correctly nested. Unmapping should + * occur in the reverse order of mapping. + */ +void *ttm_kmap_atomic_prot(struct page *page, pgprot_t prot) { if (pgprot_val(prot) == pgprot_val(PAGE_KERNEL)) return kmap_atomic(page); else return __ttm_kmap_atomic_prot(page, prot); } +EXPORT_SYMBOL(ttm_kmap_atomic_prot); - -static void ttm_kunmap_atomic_prot(void *addr, - pgprot_t prot) +/** + * ttm_kunmap_atomic_prot - Unmap a page that was mapped using + * ttm_kmap_atomic_prot. + * + * @addr: The virtual address from the map. + * @prot: The page protection. + */ +void ttm_kunmap_atomic_prot(void *addr, pgprot_t prot) { if (pgprot_val(prot) == pgprot_val(PAGE_KERNEL)) kunmap_atomic(addr); else __ttm_kunmap_atomic(addr); } +EXPORT_SYMBOL(ttm_kunmap_atomic_prot); static int ttm_copy_io_ttm_page(struct ttm_tt *ttm, void *src, unsigned long page, diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h index 8e2fb1ac4e0c..c67977aa1a0e 100644 --- a/include/drm/ttm/ttm_bo_api.h +++ b/include/drm/ttm/ttm_bo_api.h @@ -709,6 +709,10 @@ int ttm_fbdev_mmap(struct vm_area_struct *vma, struct ttm_buffer_object *bo); int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma, struct ttm_bo_device *bdev); +void *ttm_kmap_atomic_prot(struct page *page, pgprot_t prot); + +void ttm_kunmap_atomic_prot(void *addr, pgprot_t prot); + /** * ttm_bo_io * |