From 062d2e6af77a8d9a355a393a70e2bf3586e24589 Mon Sep 17 00:00:00 2001 From: Andrey Grodzovsky Date: Wed, 24 Jan 2018 08:52:26 -0500 Subject: [PATCH] Revert "drm/amdgpu/gfx8: Fix compute ring failure after resetting" MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit This reverts commit 75737cb4eb78c7f185e4700b4aa20cf7a3381aca. Fixes compute rings test failure on bare metal during full GPU reset. RCA: the ring buffer has to be filled with valid packets (such as NOPs) first before submitting MAP_QUEUEs packet into KIQ. Once a compute engine is mapped, it will immediately execute the ring buffer if the RTPR is not equal to the WTPR from the MQD. It could lead to engine hang if the ring buffer filled with random data. Signed-off-by: Andrey Grodzovsky Reviewed-by: Christian König Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c index 1207f36..8a65b53 100644 --- a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c @@ -4847,6 +4847,9 @@ static int gfx_v8_0_kcq_init_queue(struct amdgpu_ring *ring) /* reset MQD to a clean status */ if (adev->gfx.mec.mqd_backup[mqd_idx]) memcpy(mqd, adev->gfx.mec.mqd_backup[mqd_idx], sizeof(struct vi_mqd_allocation)); + /* reset ring buffer */ + ring->wptr = 0; + amdgpu_ring_clear_ring(ring); } else { amdgpu_ring_clear_ring(ring); } @@ -4921,13 +4924,6 @@ static int gfx_v8_0_kiq_resume(struct amdgpu_device *adev) /* Test KCQs */ for (i = 0; i < adev->gfx.num_compute_rings; i++) { ring = &adev->gfx.compute_ring[i]; - if (adev->in_gpu_reset) { - /* move reset ring buffer to here to workaround - * compute ring test failed - */ - ring->wptr = 0; - amdgpu_ring_clear_ring(ring); - } ring->ready = true; r = amdgpu_ring_test_ring(ring); if (r) -- 2.7.4