drm/amdgpu: clean wptr on wb when gpu recovery

The TDR will be randomly failed due to compute ring
test failure. If the compute ring wptr & 0x7ff(ring_buf_mask)
is 0x100 then after map mqd the compute ring rptr will be
synced with 0x100. And the ring test packet size is also 0x100.
Then after invocation of amdgpu_ring_commit, the cp will not
really handle the packet on the ring buffer because rptr is equal to wptr.

Signed-off-by: Yintian Tao <yttao@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Monk Liu <Monk.Liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
index 22bbb36..ced2979 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
@@ -3513,6 +3513,7 @@ static int gfx_v10_0_kcq_init_queue(struct amdgpu_ring *ring)
 
                /* reset ring buffer */
                ring->wptr = 0;
+               atomic64_set((atomic64_t *)&adev->wb.wb[ring->wptr_offs], 0);
                amdgpu_ring_clear_ring(ring);
        } else {
                amdgpu_ring_clear_ring(ring);

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
index 3afdbbd..889154a 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
@@ -3663,6 +3663,7 @@ static int gfx_v9_0_kcq_init_queue(struct amdgpu_ring *ring)
 
                /* reset ring buffer */
                ring->wptr = 0;
+               atomic64_set((atomic64_t *)&adev->wb.wb[ring->wptr_offs], 0);
                amdgpu_ring_clear_ring(ring);
        } else {
                amdgpu_ring_clear_ring(ring);