[PATCH 1/2] drm/amdgpu: don't return when sdma ring not ready(v2)

[Monk Liu]

because this time SDMA may under GPU RESET so its ring->ready
can be false(e.g. IB test failed during GPU reset), just keep
going and GPU scheduler will reschedule this job once it failed.

v2:
consider error if ring not ready only finds gpu is not doing GPU reset
handle all places in amdgpu_ttm.c as well

Signed-off-by: Monk Liu <Monk.Liu at amd.com>
Change-Id: I241036e0ba54c3aadc573d507c7bd615b8b978f9
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index e38e6db..9c9e596 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -215,7 +215,7 @@ static void amdgpu_evict_flags(struct ttm_buffer_object *bo,
 	case TTM_PL_VRAM:
 		if (adev->mman.buffer_funcs &&
 		    adev->mman.buffer_funcs_ring &&
-		    adev->mman.buffer_funcs_ring->ready == false) {
+		    (adev->mman.buffer_funcs_ring->ready == false && !adev->in_gpu_reset) ) {
 			amdgpu_ttm_placement_from_domain(abo, AMDGPU_GEM_DOMAIN_CPU);
 		} else if (adev->gmc.visible_vram_size < adev->gmc.real_vram_size &&
 			   !(abo->flags & AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED)) {
@@ -331,7 +331,7 @@ int amdgpu_ttm_copy_mem_to_mem(struct amdgpu_device *adev,
 	const uint64_t GTT_MAX_BYTES = (AMDGPU_GTT_MAX_TRANSFER_SIZE *
 					AMDGPU_GPU_PAGE_SIZE);
 
-	if (!ring->ready) {
+	if (!ring->ready && !adev->in_gpu_reset) {
 		DRM_ERROR("Trying to move memory with ring turned off.\n");
 		return -EINVAL;
 	}
@@ -579,7 +579,7 @@ static int amdgpu_bo_move(struct ttm_buffer_object *bo, bool evict,
 	}
 	if (adev->mman.buffer_funcs == NULL ||
 	    adev->mman.buffer_funcs_ring == NULL ||
-	    !adev->mman.buffer_funcs_ring->ready) {
+	    (!adev->mman.buffer_funcs_ring->ready && !adev->in_gpu_reset)) {
 		/* use memcpy */
 		goto memcpy;
 	}
@@ -1656,6 +1656,11 @@ int amdgpu_copy_buffer(struct amdgpu_ring *ring, uint64_t src_offset,
 	amdgpu_ring_pad_ib(ring, &job->ibs[0]);
 	WARN_ON(job->ibs[0].length_dw > num_dw);
 	if (direct_submit) {
+		if (!ring->ready) {
+			r = -EINVAL;
+			goto error_free;
+		}
+
 		r = amdgpu_ib_schedule(ring, job->num_ibs, job->ibs,
 				       NULL, fence);
 		job->fence = dma_fence_get(*fence);
@@ -1663,6 +1668,10 @@ int amdgpu_copy_buffer(struct amdgpu_ring *ring, uint64_t src_offset,
 			DRM_ERROR("Error scheduling IBs (%d)\n", r);
 		amdgpu_job_free(job);
 	} else {
+		if (!ring->ready && !adev->in_gpu_reset) {
+			r = -EINVAL;
+			goto error_free;
+		}
 		r = amdgpu_job_submit(job, ring, &adev->mman.entity,
 				      AMDGPU_FENCE_OWNER_UNDEFINED, fence);
 		if (r)
@@ -1692,7 +1701,7 @@ int amdgpu_fill_buffer(struct amdgpu_bo *bo,
 	struct amdgpu_job *job;
 	int r;
 
-	if (!ring->ready) {
+	if (!ring->ready && !adev->in_gpu_reset) {
 		DRM_ERROR("Trying to clear memory with ring turned off.\n");
 		return -EINVAL;
 	}
-- 
2.7.4