DMA operations by device when device is fake removed using PCI sysfs 'remove' interface

[Andrey Grodzovsky <andrey.grodzovsky@xxxxxxx>]

Hi Bjorn, I am working on graceful device removal on PCI for our amdgppu 
driver. As part of it I am triggering device remove by writing echo 1 > 
/sys/bus/pci/drivers/amdgpu/xxxx:xx:xx.x/remove

Question - in case there is a DMA operation in flight while I hit the 
'remove', is there a way to wait for completion of all the DMA 
operations of the device being removed ? Is PCI core taking care of this
or is there an API we can use to do it in the driver's pci_remove 
callback ? We are concerned with possible system memory corruptions 
otherwise.

Andrey