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drm/amdgpu: drop the busy wait for GMC v9 TLB invalidations

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This code is not performance critical.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Emily Deng <Emily.Deng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2018-10-25 10:50:42 +02:00 committed by Alex Deucher
parent af5fe1e96a
commit 396557b03c
1 changed files with 4 additions and 22 deletions
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26
drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
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@ -350,35 +350,17 @@ static void gmc_v9_0_flush_gpu_tlb(struct amdgpu_device *adev,
}
spin_lock(&adev->gmc.invalidate_lock);
WREG32_NO_KIQ(hub->vm_inv_eng0_req + eng, tmp);
/* Busy wait for ACK.*/
for (j = 0; j < 100; j++) {
tmp = RREG32_NO_KIQ(hub->vm_inv_eng0_ack + eng);
tmp &= 1 << vmid;
if (tmp)
break;
cpu_relax();
}
if (j < 100) {
spin_unlock(&adev->gmc.invalidate_lock);
continue;
}
/* Wait for ACK with a delay.*/
for (j = 0; j < adev->usec_timeout; j++) {
tmp = RREG32_NO_KIQ(hub->vm_inv_eng0_ack + eng);
tmp &= 1 << vmid;
if (tmp)
if (tmp & (1 << vmid))
break;
udelay(1);
}
if (j < adev->usec_timeout) {
spin_unlock(&adev->gmc.invalidate_lock);
continue;
}
spin_unlock(&adev->gmc.invalidate_lock);
if (j < adev->usec_timeout)
continue;
DRM_ERROR("Timeout waiting for VM flush ACK!\n");
}
}