drm/amdgpu: hide VRAM sysfs attributes on GPUs without VRAM

[ Upstream commit 33cc891b56b93cad1a83263eaf2e417436f70c82 ]

Otherwise accessing them can cause a crash.

Signed-off-by: Christian König <christian.koenig@amd.com>
Tested-by: Mangesh Gadre <Mangesh.Gadre@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
index ea4df412decff9ece669fbdefc37611997353aec..54f2e7b3927964f1704a1a757f6d52379e4f2020 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
@@ -234,6 +234,9 @@ static umode_t amdgpu_vram_attrs_is_visible(struct kobject *kobj,
            !adev->gmc.vram_vendor)
                return 0;
 
+       if (!ttm_resource_manager_used(&adev->mman.vram_mgr.manager))
+               return 0;
+
        return attr->mode;
 }