drm/amdgpu: Use GTT for dumb buffer if sg display enabled (v2)

When vram size <= THRESHOLD(256M) lets use GTT for dumb buffer
allocation. As SG will be enabled with vram size <= 256M
scan out will not be an issue.

v2: Use amdgpu_display_supported_domains to get supported domain.

Signed-off-by: Deepak Sharma <Deepak.Sharma@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>

1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
index 2c8e27370284..63758db5e2ea 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
@@ -30,6 +30,7 @@
 #include <drm/drmP.h>
 #include <drm/amdgpu_drm.h>
 #include "amdgpu.h"
+#include "amdgpu_display.h"
 
 void amdgpu_gem_object_free(struct drm_gem_object *gobj)
 {
@@ -749,15 +750,20 @@ int amdgpu_mode_dumb_create(struct drm_file *file_priv,
         struct amdgpu_device *adev = dev->dev_private;
         struct drm_gem_object *gobj;
         uint32_t handle;
+        u32 domain = amdgpu_display_supported_domains(adev);
         int r;
 
         args->pitch = amdgpu_align_pitch(adev, args->width,
                                          DIV_ROUND_UP(args->bpp, 8), 0);
         args->size = (u64)args->pitch * args->height;
         args->size = ALIGN(args->size, PAGE_SIZE);
+        if (domain == (AMDGPU_GEM_DOMAIN_VRAM | AMDGPU_GEM_DOMAIN_GTT)) {
+                domain = AMDGPU_GEM_DOMAIN_VRAM;
+                if (adev->gmc.real_vram_size <= AMDGPU_SG_THRESHOLD)
+                        domain = AMDGPU_GEM_DOMAIN_GTT;
+        }
 
-        r = amdgpu_gem_object_create(adev, args->size, 0,
-                                     AMDGPU_GEM_DOMAIN_VRAM,
+        r = amdgpu_gem_object_create(adev, args->size, 0, domain,
                                      AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED,
                                      false, NULL, &gobj);
         if (r)