[PATCH 19/22] drm/amdgpu: adjust timeout for ib_ring_tests

[Monk Liu]

issue:
sometime GFX/MM ib test hit timeout under SRIOV env, root cause
is that engine doesn't come back soon enough so the current
IB test considered as timed out.

fix:
for SRIOV GFX IB test wait time need to be expanded a lot during
SRIOV runtimei mode since it couldn't really begin before GFX engine
come back.

for SRIOV MM IB test it always need more time since MM scheduling
is not go together with GFX engine, it is controled by h/w MM
scheduler so no matter runtime or exclusive mode MM IB test
always need more time.

Change-Id: I0342371bc073656476ad850e1f5d9a021846dc8c
Signed-off-by: Monk Liu <Monk.Liu at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
index 4709d13..d6776286 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
@@ -316,14 +316,42 @@ int amdgpu_ib_ring_tests(struct amdgpu_device *adev)
 {
 	unsigned i;
 	int r, ret = 0;
+	long tmo_gfx, tmo_mm;
+
+	tmo_mm = tmo_gfx = AMDGPU_IB_TEST_TIMEOUT;
+	if (amdgpu_sriov_vf(adev)) {
+		/* for MM engines in hypervisor side they are not scheduled together
+		 * with CP and SDMA engines, so even in exclusive mode MM engine could
+		 * still running on other VF thus the IB TEST TIMEOUT for MM engines
+		 * under SR-IOV should be set to a long time.
+		 */
+		tmo_mm = 8 * AMDGPU_IB_TEST_TIMEOUT; /* 8 sec should be enough for the MM comes back to this VF */
+	}
+
+	if (amdgpu_sriov_runtime(adev)) {
+		/* for CP & SDMA engines since they are scheduled together so
+		 * need to make the timeout width enough to cover the time
+		 * cost waiting for it coming back under RUNTIME only
+		*/
+		tmo_gfx = 8 * AMDGPU_IB_TEST_TIMEOUT;
+	}
+
+	adev->accel_working = true;
 
 	for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
 		struct amdgpu_ring *ring = adev->rings[i];
+		long tmo;
 
 		if (!ring || !ring->ready)
 			continue;
 
-		r = amdgpu_ring_test_ib(ring, AMDGPU_IB_TEST_TIMEOUT);
+		/* MM engine need more time */
+		if (ring->idx > 11)
+			tmo = tmo_mm;
+		else
+			tmo = tmo_gfx;
+
+		r = amdgpu_ring_test_ib(ring, tmo);
 		if (r) {
 			ring->ready = false;
 
-- 
2.7.4