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authorThomas Hellström <thomas.hellstrom@linux.intel.com>2021-08-13 17:43:31 +0300
committerThomas Hellström <thomas.hellstrom@linux.intel.com>2021-08-25 17:05:47 +0300
commit669076334bfa7915e6856cf49c6408a2ec07df7a (patch)
tree63606a28faf8349b92064efee6c867f5c46b45db /drivers/gpu/drm/ttm
parentd8ac30fd479cf0f0b37c7f06b06b50c18f57c548 (diff)
downloadlinux-669076334bfa7915e6856cf49c6408a2ec07df7a.tar.xz
drm/ttm, drm/i915: Update ttm_move_memcpy for async use
The buffer object argument to ttm_move_memcpy was only used to determine whether the destination memory should be cleared only or whether we should copy data. Replace it with a "clear" bool, and update the callers. The intention here is to be able to use ttm_move_memcpy() async under a dma-fence as a fallback if an accelerated blit fails in a security- critical path where data might leak if the blit is not properly performed. For that purpose the bo is an unsuitable argument since its relevant members might already have changed at call time. Finally, update the ttm_move_memcpy kerneldoc that seems to have ended up with a stale version. Cc: Christian König <christian.koenig@amd.com> Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Reviewed-by: Christian König <christian.koenig@amd.com> Link: https://lore.kernel.org/r/20210813144331.372957-3-thomas.hellstrom@linux.intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20210813144331.372957-3-thomas.hellstrom@linux.intel.com
Diffstat (limited to 'drivers/gpu/drm/ttm')
-rw-r--r--drivers/gpu/drm/ttm/ttm_bo_util.c20
1 files changed, 10 insertions, 10 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
index 2f57f824e6db..e3747f069674 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -75,22 +75,21 @@ void ttm_mem_io_free(struct ttm_device *bdev,
/**
* ttm_move_memcpy - Helper to perform a memcpy ttm move operation.
- * @bo: The struct ttm_buffer_object.
- * @new_mem: The struct ttm_resource we're moving to (copy destination).
- * @new_iter: A struct ttm_kmap_iter representing the destination resource.
+ * @clear: Whether to clear rather than copy.
+ * @num_pages: Number of pages of the operation.
+ * @dst_iter: A struct ttm_kmap_iter representing the destination resource.
* @src_iter: A struct ttm_kmap_iter representing the source resource.
*
* This function is intended to be able to move out async under a
* dma-fence if desired.
*/
-void ttm_move_memcpy(struct ttm_buffer_object *bo,
+void ttm_move_memcpy(bool clear,
u32 num_pages,
struct ttm_kmap_iter *dst_iter,
struct ttm_kmap_iter *src_iter)
{
const struct ttm_kmap_iter_ops *dst_ops = dst_iter->ops;
const struct ttm_kmap_iter_ops *src_ops = src_iter->ops;
- struct ttm_tt *ttm = bo->ttm;
struct dma_buf_map src_map, dst_map;
pgoff_t i;
@@ -99,10 +98,7 @@ void ttm_move_memcpy(struct ttm_buffer_object *bo,
return;
/* Don't move nonexistent data. Clear destination instead. */
- if (src_ops->maps_tt && (!ttm || !ttm_tt_is_populated(ttm))) {
- if (ttm && !(ttm->page_flags & TTM_PAGE_FLAG_ZERO_ALLOC))
- return;
-
+ if (clear) {
for (i = 0; i < num_pages; ++i) {
dst_ops->map_local(dst_iter, &dst_map, i);
if (dst_map.is_iomem)
@@ -146,6 +142,7 @@ int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
struct ttm_kmap_iter_linear_io io;
} _dst_iter, _src_iter;
struct ttm_kmap_iter *dst_iter, *src_iter;
+ bool clear;
int ret = 0;
if (ttm && ((ttm->page_flags & TTM_PAGE_FLAG_SWAPPED) ||
@@ -169,7 +166,10 @@ int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
goto out_src_iter;
}
- ttm_move_memcpy(bo, dst_mem->num_pages, dst_iter, src_iter);
+ clear = src_iter->ops->maps_tt && (!ttm || !ttm_tt_is_populated(ttm));
+ if (!(clear && ttm && !(ttm->page_flags & TTM_PAGE_FLAG_ZERO_ALLOC)))
+ ttm_move_memcpy(clear, dst_mem->num_pages, dst_iter, src_iter);
+
src_copy = *src_mem;
ttm_bo_move_sync_cleanup(bo, dst_mem);