linux-kernel - Re: [PATCH v4 1/2] iommu/s390: Fix race with release

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Message-ID: <YxDDD2DF9KFDQ+Yk@nvidia.com>
Date:   Thu, 1 Sep 2022 11:34:55 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Niklas Schnelle <schnelle@...ux.ibm.com>,
        Pierre Morel <pmorel@...ux.ibm.com>,
        Matthew Rosato <mjrosato@...ux.ibm.com>, iommu@...ts.linux.dev,
        linux-s390@...r.kernel.org, borntraeger@...ux.ibm.com,
        hca@...ux.ibm.com, gor@...ux.ibm.com,
        gerald.schaefer@...ux.ibm.com, agordeev@...ux.ibm.com,
        svens@...ux.ibm.com, joro@...tes.org, will@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/2] iommu/s390: Fix race with release_device ops

On Thu, Sep 01, 2022 at 03:29:16PM +0100, Robin Murphy wrote:

> Right, the next step would be to bridge that gap to iommu-dma to dump the
> flush queue when IOVA allocation failure implies we've reached the
> "rollover" point, and perhaps not use the timer at all. By that point a
> dedicated domain type, or at least some definite internal flag, for this
> alternate behaviour seems like the logical way to go.

At least on this direction, I've been thinking it would be nice to
replace the domain type _FQ with a flag inside the domain, maybe the
ops, saying how the domain wants the common DMA API to operate. If it
wants FQ mode or other tuning parameters

Jason