linux-kernel - [PATCH v2 0/3] iommu: Enable non-strict DMA on QCom SD/MMC

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Date:   Thu, 24 Jun 2021 10:17:56 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     will@...nel.org, robin.murphy@....com, joro@...tes.org,
        bjorn.andersson@...aro.org, ulf.hansson@...aro.org,
        adrian.hunter@...el.com, bhelgaas@...gle.com
Cc:     john.garry@...wei.com, robdclark@...omium.org,
        quic_c_gdjako@...cinc.com, saravanak@...gle.com,
        rajatja@...gle.com, saiprakash.ranjan@...eaurora.org,
        vbadigan@...eaurora.org, linux-mmc@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        iommu@...ts.linux-foundation.org, sonnyrao@...omium.org,
        joel@...lfernandes.org, Douglas Anderson <dianders@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jonathan Corbet <corbet@....net>,
        Jordan Crouse <jordan@...micpenguin.net>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Krishna Reddy <vdumpa@...dia.com>,
        "Maciej W. Rozycki" <macro@...am.me.uk>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/3] iommu: Enable non-strict DMA on QCom SD/MMC


The goal of this patch series is to get better SD/MMC performance on
Qualcomm eMMC controllers and in generally nudge us forward on the
path of allowing some devices to be in strict mode and others to be in
non-strict mode. This patch series doesn't save the world but
hopefully at least moves us in the right direction while accomplishing
something useful. Specifically:
- No attempt is made to touch the PCI subsystem or cleanup the way
  that it requests strict vs. non-strict.
- No fully generic mechanism is come up with that makes it super easy
  for everyone to be in non-strict mode.

This patch conflicts with a few other patch series that are in
flight. I've tried to call them out "after the cut" in patches. I
assume other in flight patches will land before this one, so I'd
expect to send a rebased version when that happens, assuming that this
series isn't NAKed into the ground.

Changes in v2:
- No longer based on changes adding strictness to "struct device"
- Updated kernel-parameters docs.
- Patch moving check for strictness in arm-smmu new for v2.
- Now accomplish the goal by putting rules in the IOMMU driver.
- Reworded commit message to clarify things pointed out by Greg.

Douglas Anderson (3):
  iommu: Add per-domain strictness and combine with the global default
  iommu/arm-smmu: Check for strictness after calling
    impl->init_context()
  mmc: sdhci-msm: Request non-strict IOMMU mode

 .../admin-guide/kernel-parameters.txt         |  5 ++-
 drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c    | 19 ++++++++
 drivers/iommu/arm/arm-smmu/arm-smmu.c         |  6 +--
 drivers/iommu/iommu.c                         | 43 +++++++++++++++----
 include/linux/iommu.h                         |  7 +++
 5 files changed, 67 insertions(+), 13 deletions(-)

-- 
2.32.0.93.g670b81a890-goog