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From d471a8a8f117b852f6aa081443747ed8e4b66aa7 Mon Sep 17 00:00:00 2001
From: Eric Huang <JinhuiEric.Huang@amd.com>
Date: Tue, 5 Nov 2019 16:29:57 -0500
Subject: [PATCH 4366/4736] drm/amdgpu: change read of GPU clock counter on
Vega10 VF
Using unified VBIOS has performance drop in sriov environment.
The fix is switching to another register instead.
Signed-off-by: Eric Huang <JinhuiEric.Huang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
---
drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c | 19 ++++++++++++++++---
1 file changed, 16 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
index a3bb662acb1f..4fe3c5ebaf58 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
@@ -3887,9 +3887,22 @@ static uint64_t gfx_v9_0_get_gpu_clock_counter(struct amdgpu_device *adev)
uint64_t clock;
mutex_lock(&adev->gfx.gpu_clock_mutex);
- WREG32_SOC15(GC, 0, mmRLC_CAPTURE_GPU_CLOCK_COUNT, 1);
- clock = (uint64_t)RREG32_SOC15(GC, 0, mmRLC_GPU_CLOCK_COUNT_LSB) |
- ((uint64_t)RREG32_SOC15(GC, 0, mmRLC_GPU_CLOCK_COUNT_MSB) << 32ULL);
+ if (adev->asic_type == CHIP_VEGA10 && amdgpu_sriov_runtime(adev)) {
+ uint32_t tmp, lsb, msb, i = 0;
+ do {
+ if (i != 0)
+ udelay(1);
+ tmp = RREG32_SOC15(GC, 0, mmRLC_REFCLOCK_TIMESTAMP_MSB);
+ lsb = RREG32_SOC15(GC, 0, mmRLC_REFCLOCK_TIMESTAMP_LSB);
+ msb = RREG32_SOC15(GC, 0, mmRLC_REFCLOCK_TIMESTAMP_MSB);
+ i++;
+ } while (unlikely(tmp != msb) && (i < adev->usec_timeout));
+ clock = (uint64_t)lsb | ((uint64_t)msb << 32ULL);
+ } else {
+ WREG32_SOC15(GC, 0, mmRLC_CAPTURE_GPU_CLOCK_COUNT, 1);
+ clock = (uint64_t)RREG32_SOC15(GC, 0, mmRLC_GPU_CLOCK_COUNT_LSB) |
+ ((uint64_t)RREG32_SOC15(GC, 0, mmRLC_GPU_CLOCK_COUNT_MSB) << 32ULL);
+ }
mutex_unlock(&adev->gfx.gpu_clock_mutex);
return clock;
}
--
2.17.1
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