[PATCH v3] drm/amd/amdgpu:Fix compute ring unable to detect hang.

[Jesse Zhang]

When compute fence did signal, compute ring cannot detect hardware hang
because its timeout value is set to be infinite by default.

In SR-IOV and passthrough mode, if user does not declare custome timeout
value for compute ring, then use gfx ring timeout value as default. So
that when there is a ture hardware hang, compute ring can detect it.

Change-Id: I794ec0868c6c0aad407749457260ecfee0617c10
Signed-off-by: Jesse Zhang <zhexi.zhang at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c |  5 +----
 drivers/gpu/drm/amd/amdgpu/soc15.c        | 10 ++++++++++
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
index cbcaa7c..963b6d1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
@@ -468,10 +468,7 @@ int amdgpu_fence_driver_init_ring(struct amdgpu_ring *ring,
 			 * For sriov case, always use the timeout
 			 * as gfx ring
 			 */
-			if (!amdgpu_sriov_vf(ring->adev))
-				timeout = adev->compute_timeout;
-			else
-				timeout = adev->gfx_timeout;
+			timeout = adev->compute_timeout;
 			break;
 		case AMDGPU_RING_TYPE_SDMA:
 			timeout = adev->sdma_timeout;
diff --git a/drivers/gpu/drm/amd/amdgpu/soc15.c b/drivers/gpu/drm/amd/amdgpu/soc15.c
index 7c7e9f5..6cd5548 100644
--- a/drivers/gpu/drm/amd/amdgpu/soc15.c
+++ b/drivers/gpu/drm/amd/amdgpu/soc15.c
@@ -687,6 +687,16 @@ int soc15_set_ip_blocks(struct amdgpu_device *adev)
 	adev->rev_id = soc15_get_rev_id(adev);
 	adev->nbio.funcs->detect_hw_virt(adev);
 
+	/*
+	 * If running under SR-IOV or passthrough mode and user did not set
+	 * custom value for compute ring timeout, set timeout to be the same
+	 * as gfx ring timeout to avoid compute ring cannot detect an true
+	 * hang.
+	 */
+	if ((amdgpu_sriov_vf(adev) || amdgpu_passthrough(adev)) &&
+		(adev->compute_timeout == MAX_SCHEDULE_TIMEOUT))
+		adev->compute_timeout = adev->gfx_timeout;
+
 	if (amdgpu_sriov_vf(adev))
 		adev->virt.ops = &xgpu_ai_virt_ops;
 
-- 
2.7.4