[PATCH 4.14 028/229] drm/amdgpu: Check BOs requested pinning domains against its preferred_domains

Greg Kroah-Hartman
2022-08-23T09:32:35Z

From: Leo Li <sunpeng.li@amd.com>

commit f5ba14043621f4afdf3ad5f92ee2d8dbebbe4340 upstream.

When pinning a buffer, we should check to see if there are any
additional restrictions imposed by bo->preferred_domains. This will
prevent the BO from being moved to an invalid domain when pinning.

For example, this can happen if the user requests to create a BO in GTT
domain for display scanout. amdgpu_dm will allow pinning to either VRAM
or GTT domains, since DCN can scanout from either or. However, in
amdgpu_bo_pin_restricted(), pinning to VRAM is preferred if there is
adequate carveout. This can lead to pinning to VRAM despite the user
requesting GTT placement for the BO.

v2: Allow the kernel to override the domain, which can happen when
exporting a BO to a V4L camera (for example).

Signed-off-by: Leo Li <sunpeng.li@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -682,6 +682,10 @@ int amdgpu_bo_pin_restricted(struct amdg
if (WARN_ON_ONCE(min_offset > max_offset))
return -EINVAL;

+ /* Check domain to be pinned to against preferred domains */
+ if (bo->preferred_domains & domain)
+ domain = bo->preferred_domains & domain;
+
/* A shared bo cannot be migrated to VRAM */
if (bo->prime_shared_count) {
if (domain & AMDGPU_GEM_DOMAIN_GTT)