9 Mar
2023
9 Mar
'23
1:14 a.m.
On 3/8/23 8:35 AM, Jason Gunthorpe wrote:
Replace allows all the devices in a group to move in one step to a new HWPT. Further, the HWPT move is done without going through a blocking domain so that the IOMMU driver can implement some level of non-distruption to ongoing DMA if that has meaning for it (eg for future special driver domains)
Replace uses a lot of the same logic as normal attach, except the actual domain change over has different restrictions, and we are careful to sequence things so that failure is going to leave everything the way it was, and not get trapped in a blocking domain or something if there is ENOMEM.
Signed-off-by: Jason Gunthorpejgg@nvidia.com
Reviewed-by: Lu Baolu baolu.lu@linux.intel.com
Best regards, baolu