linux-kernel - [PATCH v4 0/6] normalize IOMMU dma mode boot options

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Date:   Sun, 7 Apr 2019 20:41:41 +0800
From:   Zhen Lei <thunder.leizhen@...wei.com>
To:     Jean-Philippe Brucker <jean-philippe.brucker@....com>,
        John Garry <john.garry@...wei.com>,
        Robin Murphy <robin.murphy@....com>,
        Will Deacon <will.deacon@....com>,
        Joerg Roedel <joro@...tes.org>,
        Jonathan Corbet <corbet@....net>,
        linux-doc <linux-doc@...r.kernel.org>,
        Sebastian Ott <sebott@...ux.ibm.com>,
        Gerald Schaefer <gerald.schaefer@...ibm.com>,
        "Martin Schwidefsky" <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        "Michael Ellerman" <mpe@...erman.id.au>,
        Tony Luck <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        David Woodhouse <dwmw2@...radead.org>,
        iommu <iommu@...ts.linux-foundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        x86 <x86@...nel.org>, linux-ia64 <linux-ia64@...r.kernel.org>
CC:     Zhen Lei <thunder.leizhen@...wei.com>,
        Hanjun Guo <guohanjun@...wei.com>
Subject: [PATCH v4 0/6] normalize IOMMU dma mode boot options

As Robin Murphy's suggestion:
"It's also not necessarily obvious to the user how this interacts with
IOMMU_DEFAULT_PASSTHROUGH, so if we really do go down this route, maybe it
would be better to refactor the whole lot into a single selection of something
like IOMMU_DEFAULT_MODE anyway."

In this version, I tried to normalize the IOMMU dma mode boot options for all
ARCHs. When IOMMU is enabled, there are 3 dma modes: paasthrough(bypass),
lazy(mapping but defer the IOTLB invalidation), strict. But currently each
ARCHs defined their private boot options, different with each other. For
example, to enable/disable "passthrough", ARM64 use iommu.passthrough=1/0,
X86 use iommu=pt/nopt, PPC/POWERNV use iommu=nobypass.


Zhen Lei (6):
  iommu: use iommu.dma_mode to replace iommu.passthrough and
    iommu.strict
  iommu: keep dma mode build options consistent with cmdline options
  iommu: add iommu_default_dma_mode_get() helper
  s390/pci: use common boot option iommu.dma_mode
  powernv/iommu: use common boot option iommu.dma_mode
  x86/iommu: use common boot option iommu.dma_mode

 Documentation/admin-guide/kernel-parameters.txt | 42 +++++++-------------
 arch/ia64/include/asm/iommu.h                   |  2 -
 arch/ia64/kernel/pci-dma.c                      |  2 -
 arch/powerpc/platforms/powernv/pci-ioda.c       | 23 +----------
 arch/s390/pci/pci_dma.c                         | 20 +++-------
 arch/x86/include/asm/iommu.h                    |  1 -
 arch/x86/kernel/pci-dma.c                       | 20 ----------
 drivers/iommu/Kconfig                           | 36 ++++++++++++++---
 drivers/iommu/amd_iommu.c                       | 12 +++---
 drivers/iommu/amd_iommu_init.c                  |  4 --
 drivers/iommu/amd_iommu_types.h                 |  6 ---
 drivers/iommu/intel-iommu.c                     |  7 +---
 drivers/iommu/iommu.c                           | 52 ++++++++++++++++---------
 include/linux/iommu.h                           | 16 ++++++++
 14 files changed, 108 insertions(+), 135 deletions(-)

-- 
1.8.3