[PATCH v6 16/16] drm/amdgpu: Verify DMA opearations from device are done

[Christian König]

Am 10.05.21 um 18:36 schrieb Andrey Grodzovsky:
> In case device remove is just simualted by sysfs then verify
> device doesn't keep doing DMA to the released memory after
> pci_remove is done.
>
> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky at amd.com>

Acked-by: Christian König <christian.koenig at amd.com>

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 6 ++++++
>   1 file changed, 6 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> index 83006f45b10b..5e6af9e0b7bf 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> @@ -1314,7 +1314,13 @@ amdgpu_pci_remove(struct pci_dev *pdev)
>   	drm_dev_unplug(dev);
>   	amdgpu_driver_unload_kms(dev);
>   
> +	/*
> +	 * Flush any in flight DMA operations from device.
> +	 * Clear the Bus Master Enable bit and then wait on the PCIe Device
> +	 * StatusTransactions Pending bit.
> +	 */
>   	pci_disable_device(pdev);
> +	pci_wait_for_pending_transaction(pdev);
>   }
>   
>   static void