Re: [PATCH v6 2/6] iommu/arm-smmu-v3: Add CS_NONE quirk

[Nicolin Chen]

On Tue, Apr 30, 2024 at 01:37:33PM -0300, Jason Gunthorpe wrote:
> On Tue, Apr 30, 2024 at 09:30:43AM -0700, Nicolin Chen wrote:
> > >  	queue_write(Q_ENT(q, cons), cmd, q->ent_dwords);
> > 
> > Here is the only caller for "msi=false". Maybe we could just do:
> > +	arm_smmu_cmdq_build_sync_cmd(cmd, smmu, q, cons);
> > 
> > So, no need of "bool msi"? It would slightly change the behavior
> > though, a SYNC for ARM_SMMU_OPT_MSIPOLL should be still a SYNC.
> 
> I don't know, I didn't try to figure out what to stick for prod in
> that case. It is probably OK to convert an error entry into a MSI
> sync if it works out?

Yea. I think it should be okay. I will try a hack with an illegal
command to test it out.

Nicolin