On 2022/8/26 22:52, Jason Gunthorpe wrote:
On Fri, Aug 26, 2022 at 08:11:31PM +0800, Lu Baolu wrote:
Allocate the blocking domain when probing devices if the driver supports
blocking domain allocation. Otherwise, revert to the previous behavior,
that is, use UNMANAGED domain instead when the blocking domain is needed.
Signed-off-by: Lu Baolu<baolu.lu@xxxxxxxxxxxxxxx>
Tested-by: Zhangfei Gao<zhangfei.gao@xxxxxxxxxx>
Tested-by: Tony Zhu<tony.zhu@xxxxxxxxx>
---
drivers/iommu/iommu.c | 29 +++++++++++++++++------------
1 file changed, 17 insertions(+), 12 deletions(-)
This seems like a lot of overhead to allocate these things for every
group?
Why not add a simple refcount on the blocking domain instead and
allocate the domain on the pasid attach like we do for ownership?
I am working towards implementing static instance of blocking domain for
each IOMMU driver, and then, there's no much overhead to allocate it in
the probing device path.
Best regards,
baolu
