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drm/amdgpu: fix sdma doorbell init ordering on APUs

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Commit 8795e182b0 ("PCI/portdrv: Don't disable AER reporting in get_port_device_capability()")
uncovered a bug in amdgpu that required a reordering of the driver
init sequence to avoid accessing a special register on the GPU
before it was properly set up leading to an PCI AER error.  This
reordering uncovered a different hw programming ordering dependency
in some APUs where the SDMA doorbells need to be programmed before
the GFX doorbells. To fix this, move the SDMA doorbell programming
back into the soc15 common code, but use the actual doorbell range
values directly rather than the values stored in the ring structure
since those will not be initialized at this point.

This is a partial revert, but with the doorbell assignment
fixed so the proper doorbell index is set before it's used.

Fixes: e3163bc8ff ("drm/amdgpu: move nbio sdma_doorbell_range() into sdma code for vega")
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: skhan@linuxfoundation.org
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher 2022-10-19 16:57:42 -04:00
parent 8273b40486
commit 50b0e4d4da
2 changed files with 21 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
View File

@ -1417,11 +1417,6 @@ static int sdma_v4_0_start(struct amdgpu_device *adev)
WREG32_SDMA(i, mmSDMA0_CNTL, temp);
if (!amdgpu_sriov_vf(adev)) {
ring = &adev->sdma.instance[i].ring;
adev->nbio.funcs->sdma_doorbell_range(adev, i,
ring->use_doorbell, ring->doorbell_index,
adev->doorbell_index.sdma_doorbell_range);
/* unhalt engine */
temp = RREG32_SDMA(i, mmSDMA0_F32_CNTL);
temp = REG_SET_FIELD(temp, SDMA0_F32_CNTL, HALT, 0);

21
drivers/gpu/drm/amd/amdgpu/soc15.c
View File

@ -1211,6 +1211,20 @@ static int soc15_common_sw_fini(void *handle)
return 0;
}
static void soc15_sdma_doorbell_range_init(struct amdgpu_device *adev)
{
int i;
/* sdma doorbell range is programed by hypervisor */
if (!amdgpu_sriov_vf(adev)) {
for (i = 0; i < adev->sdma.num_instances; i++) {
adev->nbio.funcs->sdma_doorbell_range(adev, i,
true, adev->doorbell_index.sdma_engine[i] << 1,
adev->doorbell_index.sdma_doorbell_range);
}
}
}
static int soc15_common_hw_init(void *handle)
{
struct amdgpu_device *adev = (struct amdgpu_device *)handle;
@ -1230,6 +1244,13 @@ static int soc15_common_hw_init(void *handle)
/* enable the doorbell aperture */
soc15_enable_doorbell_aperture(adev, true);
/* HW doorbell routing policy: doorbell writing not
* in SDMA/IH/MM/ACV range will be routed to CP. So
* we need to init SDMA doorbell range prior
* to CP ip block init and ring test. IH already
* happens before CP.
*/
soc15_sdma_doorbell_range_init(adev);
return 0;
}