Am 02.03.20 um 10:22 schrieb Monk Liu:
scratch_reg0 is used by RLCG for register access usage
in SRIOV case.
both CP firmware and driver can invoke RLCG to do
certain register access (through scratch_reg0/1/2/3)
but rlcg now dosen't have race concern so if two
clients are in parallel doing the RLCG reg access
then we are colliding,
GFX IB test is a runtime work, so it is forbidden
to use scrach_reg0/1/2/3 during IB test period
note:
Although we can only have this change for SRIOV, but
looks it doesn't worth the effort to differentiate
bare-metal with SRIOV on the GFX ib test
Signed-off-by: Monk Liu <Monk.Liu@xxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Must have been copy&pasted from some old code. IIRC we stoped using
scratch regs for gfx9 for quite a while as well.
Christian.
---
drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c | 38 +++++++++++++++-------------------
1 file changed, 17 insertions(+), 21 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
index afae4cc..b86a531 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
@@ -500,29 +500,28 @@ static int gfx_v10_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 index;
+ uint64_t gpu_addr;
+ uint32_t tmp;
long r;
- r = amdgpu_gfx_scratch_get(adev, &scratch);
- if (r) {
- DRM_ERROR("amdgpu: failed to get scratch reg (%ld).\n", r);
+ r = amdgpu_device_wb_get(adev, &index);
+ if (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);
- if (r) {
- DRM_ERROR("amdgpu: failed to get ib (%ld).\n", r);
+ r = amdgpu_ib_get(adev, NULL, 16, &ib);
+ if (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)
@@ -530,15 +529,13 @@ static int gfx_v10_0_ring_test_ib(struct amdgpu_ring *ring, long timeout)
r = dma_fence_wait_timeout(f, false, timeout);
if (r == 0) {
- DRM_ERROR("amdgpu: IB test timed out.\n");
r = -ETIMEDOUT;
goto err2;
} else if (r < 0) {
- DRM_ERROR("amdgpu: fence wait failed (%ld).\n", r);
goto err2;
}
- tmp = RREG32(scratch);
+ tmp = adev->wb.wb[index];
if (tmp == 0xDEADBEEF)
r = 0;
else
@@ -547,8 +544,7 @@ static int gfx_v10_0_ring_test_ib(struct amdgpu_ring *ring, long timeout)
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;
}
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