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drm/amdgpu/gfx11: wait for reset done before remap

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There is a racing condition that cp firmware modifies
MQD in reset sequence after driver updates it for
remapping. We have to wait till CP_HQD_ACTIVE becoming
false then remap the queue.

Acked-by: Vitaly Prosyak <vitaly.prosyak@amd.com>
Signed-off-by: Jiadong Zhu <Jiadong.Zhu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Jiadong Zhu 2024-07-02 10:01:21 +08:00 committed by Alex Deucher
parent 7d8e9e65f2
commit a10c93931b
1 changed files with 14 additions and 1 deletions
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15
drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c
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@ -6582,16 +6582,29 @@ static int gfx_v11_0_reset_kgq(struct amdgpu_ring *ring, unsigned int vmid)
static int gfx_v11_0_reset_kcq(struct amdgpu_ring *ring, unsigned int vmid)
{
struct amdgpu_device *adev = ring->adev;
int r;
int i, r = 0;
gfx_v11_0_set_safe_mode(adev, 0);
mutex_lock(&adev->srbm_mutex);
soc21_grbm_select(adev, ring->me, ring->pipe, ring->queue, 0);
WREG32_SOC15(GC, 0, regCP_HQD_DEQUEUE_REQUEST, 0x2);
WREG32_SOC15(GC, 0, regSPI_COMPUTE_QUEUE_RESET, 0x1);
/* make sure dequeue is complete*/
for (i = 0; i < adev->usec_timeout; i++) {
if (!(RREG32_SOC15(GC, 0, regCP_HQD_ACTIVE) & 1))
break;
udelay(1);
}
if (i >= adev->usec_timeout)
r = -ETIMEDOUT;
soc21_grbm_select(adev, 0, 0, 0, 0);
mutex_unlock(&adev->srbm_mutex);
gfx_v11_0_unset_safe_mode(adev, 0);
if (r) {
dev_err(adev->dev, "fail to wait on hqd deactivate\n");
return r;
}
r = amdgpu_bo_reserve(ring->mqd_obj, false);
if (unlikely(r != 0)) {