From: Robin Murphy <robin.murphy@arm.com>
To: Doug Anderson <dianders@chromium.org>, Joerg Roedel <joro@8bytes.org>
Cc: Will Deacon <will@kernel.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Ulf Hansson <ulf.hansson@linaro.org>,
Adrian Hunter <adrian.hunter@intel.com>,
Bjorn Helgaas <bhelgaas@google.com>,
John Garry <john.garry@huawei.com>,
Rob Clark <robdclark@chromium.org>,
quic_c_gdjako@quicinc.com, Saravana Kannan <saravanak@google.com>,
Rajat Jain <rajatja@google.com>,
Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>,
Veerabhadrarao Badiganti <vbadigan@codeaurora.org>,
Linux MMC List <linux-mmc@vger.kernel.org>,
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"list@263.net:IOMMU DRIVERS" <iommu@lists.linux-foundation.org>,
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Subject: Re: [PATCH v2 0/3] iommu: Enable non-strict DMA on QCom SD/MMC
Date: Tue, 13 Jul 2021 19:07:00 +0100 [thread overview]
Message-ID: <e3555c49-2978-355f-93bb-dbfa7d09cab8@arm.com> (raw)
In-Reply-To: <CAD=FV=U_mKPaGfWyN1SVi9S2hPBpG=rE_p89+Jvjr95d0TvgsA@mail.gmail.com>
On 2021-07-08 15:36, Doug Anderson wrote:
[...]
>> Or document for the users that want performance how to
>> change the setting, so that they can decide.
>
> Pushing this to the users can make sense for a Linux distribution but
> probably less sense for an embedded platform. So I'm happy to make
> some way for a user to override this (like via kernel command line),
> but I also strongly believe there should be a default that users don't
> have to futz with that we think is correct.
FYI I did make progress on the "punt it to userspace" approach. I'm not
posting it even as an RFC yet because I still need to set up a machine
to try actually testing any of it (it's almost certainly broken
somewhere), but in the end it comes out looking surprisingly not too bad
overall. If you're curious to take a look in the meantime I put it here:
https://gitlab.arm.com/linux-arm/linux-rm/-/commits/iommu/fq
Cheers,
Robin.
next prev parent reply other threads:[~2021-07-13 18:07 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-24 17:17 [PATCH v2 0/3] iommu: Enable non-strict DMA on QCom SD/MMC Douglas Anderson
2021-06-24 17:17 ` [PATCH v2 1/3] iommu: Add per-domain strictness and combine with the global default Douglas Anderson
2021-06-24 17:17 ` [PATCH v2 2/3] iommu/arm-smmu: Check for strictness after calling impl->init_context() Douglas Anderson
2021-06-24 17:17 ` [PATCH v2 3/3] mmc: sdhci-msm: Request non-strict IOMMU mode Douglas Anderson
2021-06-24 23:05 ` Doug Anderson
2021-06-25 13:18 ` [PATCH v2 0/3] iommu: Enable non-strict DMA on QCom SD/MMC Joerg Roedel
2021-06-25 14:42 ` Doug Anderson
2021-07-07 20:00 ` Doug Anderson
2021-07-08 8:08 ` Joerg Roedel
2021-07-08 14:36 ` Doug Anderson
2021-07-13 18:07 ` Robin Murphy [this message]
2021-07-14 15:14 ` Doug Anderson
2021-08-03 0:09 ` Rajat Jain
2021-08-03 0:34 ` Rajat Jain
2021-08-03 8:19 ` Robin Murphy
2021-07-09 13:56 ` Robin Murphy
2021-07-14 10:15 ` Joerg Roedel
2021-07-14 10:29 ` Robin Murphy
2021-07-14 10:48 ` Joerg Roedel
2021-07-09 19:21 ` Robin Murphy
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