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drm/ttm: Export the ttm_k[un]map_atomic_prot API.

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It will be used by vmwgfx cpu blit.

Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
This commit is contained in:
Thomas Hellstrom 2018-01-16 09:12:05 +01:00
parent 403c1826a4
commit 9c11fcf1a7
2 changed files with 30 additions and 5 deletions
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31
drivers/gpu/drm/ttm/ttm_bo_util.c
View File

@ -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,

4
include/drm/ttm/ttm_bo_api.h
View File

@ -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
*