linux-kernel - Re: [PATCH v6 2/6] iommu/arm-smmu-v3: Add CS

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Date: Tue, 30 Apr 2024 09:43:49 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: Jason Gunthorpe <jgg@...dia.com>
CC: <will@...nel.org>, <robin.murphy@....com>, <joro@...tes.org>,
	<thierry.reding@...il.com>, <vdumpa@...dia.com>, <jonathanh@...dia.com>,
	<linux-kernel@...r.kernel.org>, <iommu@...ts.linux.dev>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v6 2/6] iommu/arm-smmu-v3: Add CS_NONE quirk

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