It will be used by vmwgfx cpu blit.
Cc: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
Reviewed-by: Brian Paul <brianp@xxxxxxxxxx>
---
drivers/gpu/drm/ttm/ttm_bo_util.c | 31 ++++++++++++++++++++++++++-----
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 6d6d939..9d4c7f8 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 f1c74c2..936e5d5 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -728,6 +728,10 @@ unsigned long ttm_bo_default_io_mem_pfn(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
*
--
2.7.4
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