[PATCH] drm/amdgpu: adjust get preferred domain policy

[Yifan Zhang]

current preferred domain policy is static, which makes vram > 256M
APU never get a chance to allocate system S/G framebuffer. Change
this policy to take vram memory pressure into accout. If system
support both vram/system memory, return the preferred domain based
on vram usage.

Signed-off-by: Yifan Zhang <yifan1.zh...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index 65a9b23f0a46..ea3b084e3c3f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -1530,7 +1530,9 @@ uint32_t amdgpu_bo_get_preferred_domain(struct 
amdgpu_device *adev,
 {
        if (domain == (AMDGPU_GEM_DOMAIN_VRAM | AMDGPU_GEM_DOMAIN_GTT)) {
                domain = AMDGPU_GEM_DOMAIN_VRAM;
-               if (adev->gmc.real_vram_size <= AMDGPU_SG_THRESHOLD)
+               if (adev->gmc.real_vram_size -
+                               atomic64_read(&adev->mman.vram_mgr.vis_usage) <=
+                               AMDGPU_SG_THRESHOLD)
                        domain = AMDGPU_GEM_DOMAIN_GTT;
        }
        return domain;
-- 
2.25.1