This patch is extends the usage of WB in gfx8's ib test which was originally implemented in the below upstream patch "ed9324a drm/amdgpu: change gfx9 ib test to use WB"
For reference below are the reasons for switching to WB: 1)Because when doing IB test we don't want to involve KIQ health status affect, and since SCRATCH register access is go through KIQ that way GFX IB test would failed due to KIQ fail. 2)acccessing SCRATCH register cost much more time than WB method because SCRATCH register access runs through KIQ which at least could begin after GPU world switch back to current Guest VF Signed-off-by: Shirish S <shiris...@amd.com> Reviewed-by: Chunming Zhou <david1.z...@amd.com> Reviewed-by: Christian König <christian.koe...@amd.com> --- drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c | 35 +++++++++++++++++++++-------------- 1 file changed, 21 insertions(+), 14 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c index 818874b..61452c7 100644 --- a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c @@ -866,26 +866,32 @@ static int gfx_v8_0_ring_test_ib(struct amdgpu_ring *ring, long timeout) struct amdgpu_device *adev = ring->adev; struct amdgpu_ib ib; struct dma_fence *f = NULL; - uint32_t scratch; - uint32_t tmp = 0; + + unsigned int index; + uint64_t gpu_addr; + uint32_t tmp; long r; - r = amdgpu_gfx_scratch_get(adev, &scratch); + r = amdgpu_device_wb_get(adev, &index); if (r) { - DRM_ERROR("amdgpu: failed to get scratch reg (%ld).\n", r); + dev_err(adev->dev, "(%ld) failed to allocate wb slot\n", r); return r; } - WREG32(scratch, 0xCAFEDEAD); + + gpu_addr = adev->wb.gpu_addr + (index * 4); + adev->wb.wb[index] = cpu_to_le32(0xCAFEDEAD); memset(&ib, 0, sizeof(ib)); - r = amdgpu_ib_get(adev, NULL, 256, &ib); + r = amdgpu_ib_get(adev, NULL, 16, &ib); if (r) { DRM_ERROR("amdgpu: failed to get ib (%ld).\n", r); goto err1; } - ib.ptr[0] = PACKET3(PACKET3_SET_UCONFIG_REG, 1); - ib.ptr[1] = ((scratch - PACKET3_SET_UCONFIG_REG_START)); - ib.ptr[2] = 0xDEADBEEF; - ib.length_dw = 3; + ib.ptr[0] = PACKET3(PACKET3_WRITE_DATA, 3); + ib.ptr[1] = WRITE_DATA_DST_SEL(5) | WR_CONFIRM; + ib.ptr[2] = lower_32_bits(gpu_addr); + ib.ptr[3] = upper_32_bits(gpu_addr); + ib.ptr[4] = 0xDEADBEEF; + ib.length_dw = 5; r = amdgpu_ib_schedule(ring, 1, &ib, NULL, &f); if (r) @@ -900,20 +906,21 @@ static int gfx_v8_0_ring_test_ib(struct amdgpu_ring *ring, long timeout) DRM_ERROR("amdgpu: fence wait failed (%ld).\n", r); goto err2; } - tmp = RREG32(scratch); + + tmp = adev->wb.wb[index]; if (tmp == 0xDEADBEEF) { DRM_DEBUG("ib test on ring %d succeeded\n", ring->idx); r = 0; } else { - DRM_ERROR("amdgpu: ib test failed (scratch(0x%04X)=0x%08X)\n", - scratch, tmp); + DRM_ERROR("ib test on ring %d failed\n", ring->idx); r = -EINVAL; } + err2: amdgpu_ib_free(adev, &ib, NULL); dma_fence_put(f); err1: - amdgpu_gfx_scratch_free(adev, scratch); + amdgpu_device_wb_free(adev, index); return r; } -- 2.7.4 _______________________________________________ amd-gfx mailing list amd-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx