[amd-gfx] [PATCH 2/2] drm/amdgpu: evict vram when gpu reset

[Alex Deucher]

From: Chunming Zhou <David1.Zhou at amd.com>

On workstation cards with ECC vram, the entirety of vram is cleared to 0
on asic init to set the ECC status correctly.  On non ECC boards, I don't
think they do any explicit clearing, but the vram controller is reset
which may cause issues with the data there.

Signed-off-by: Chunming Zhou <David1.Zhou at amd.com>
Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 2193c98..000a9d1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -1959,6 +1959,9 @@ int amdgpu_gpu_reset(struct amdgpu_device *adev)
 
 	atomic_inc(&adev->gpu_reset_counter);
 
+	/* evict vram memory */
+	amdgpu_bo_evict_vram(adev);
+
 	/* block scheduler */
 	for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
 		struct amdgpu_ring *ring = adev->rings[i];
@@ -1967,6 +1970,7 @@ int amdgpu_gpu_reset(struct amdgpu_device *adev)
 			continue;
 		kthread_park(ring->sched.thread);
 	}
+
 	/* block TTM */
 	resched = ttm_bo_lock_delayed_workqueue(&adev->mman.bdev);
 	/* store modesetting */
-- 
2.5.5