Commit 396557b0 authored by Christian König's avatar Christian König Committed by Alex Deucher
Browse files

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



This code is not performance critical.

Signed-off-by: default avatarChristian König <christian.koenig@amd.com>
Reviewed-by: default avatarEmily Deng <Emily.Deng@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent af5fe1e9

drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c

+4 −22
Original line number Diff line number Diff line
@@ -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);

		if (j < adev->usec_timeout)

			continue;

		}

		spin_unlock(&adev->gmc.invalidate_lock);



		DRM_ERROR("Timeout waiting for VM flush ACK!\n");

	}

}

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