Re: [PATCH v2 08/12] iommu: Prepare for separating SVA and IOPF

[Jason Gunthorpe]

On Thu, Aug 10, 2023 at 02:35:40AM +0000, Tian, Kevin wrote:
> > From: Baolu Lu <baolu.lu@xxxxxxxxxxxxxxx>
> > Sent: Wednesday, August 9, 2023 6:41 PM
> > 
> > On 2023/8/9 8:02, Tian, Kevin wrote:
> > >> From: Jason Gunthorpe <jgg@xxxxxxxx>
> > >> Sent: Wednesday, August 9, 2023 2:43 AM
> > >>
> > >> On Thu, Aug 03, 2023 at 08:16:47AM +0000, Tian, Kevin wrote:
> > >>
> > >>> Is there plan to introduce further error in the future? otherwise this
> > should
> > >>> be void.
> > >>>
> > >>> btw the work queue is only for sva. If there is no other caller this can be
> > >>> just kept in iommu-sva.c. No need to create a helper.
> > >>
> > >> I think more than just SVA will need a work queue context to process
> > >> their faults.
> > >>
> > >
> > > then this series needs more work. Currently the abstraction doesn't
> > > include workqueue in the common fault reporting layer.
> > 
> > Do you mind elaborate a bit here? workqueue is a basic infrastructure in
> > the fault handling framework, but it lets the consumers choose to use
> > it, or not to.
> > 
> 
> My understanding of Jason's comment was to make the workqueue the
> default path instead of being opted by the consumer.. that is my 1st
> impression but might be wrong...

Yeah, that is one path. Do we have anyone that uses this that doesn't
want the WQ? (actually who even uses this besides SVA?)

Jason