linux-kernel - [PATCH v13 0/6] iommu: Enhance IOMMU default DMA mode build options

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Date:   Wed, 16 Jun 2021 19:03:51 +0800
From:   John Garry <john.garry@...wei.com>
To:     <joro@...tes.org>, <will@...nel.org>, <dwmw2@...radead.org>,
        <baolu.lu@...ux.intel.com>, <robin.murphy@....com>,
        <corbet@....net>
CC:     <linux-kernel@...r.kernel.org>, <iommu@...ts.linux-foundation.org>,
        <linuxarm@...wei.com>, <thunder.leizhen@...wei.com>,
        <chenxiang66@...ilicon.com>, <linux-doc@...r.kernel.org>,
        John Garry <john.garry@...wei.com>
Subject: [PATCH v13 0/6] iommu: Enhance IOMMU default DMA mode build options

This is a reboot of Zhen Lei's series from a couple of years ago, which
never made it across the line.

I still think that it has some value, so taking up the mantle.

Motivation:
Allow lazy mode be default mode for DMA domains for all ARCHs, and not
only those who hardcode it (to be lazy). For ARM64, currently we must use
a kernel command line parameter to use lazy mode, which is less than
ideal.

I have now included the print for strict/lazy mode, which I originally
sent in:
https://lore.kernel.org/linux-iommu/72eb3de9-1d1c-ae46-c5a9-95f26525d435@huawei.com/

There was some concern there about drivers and their custom prints
conflicting with the print in that patch, but I think that it
should be ok.

Differences to v12:
- Rebase to next-20210611 and include patch "iommu: Update "iommu.strict"
  documentation" as a baseline
- Add Robin's RB tags (thanks!)
	- Please let me know if not ok with kernel-parameters.txt update
	  in 3/6
- Add a patch to mark x86 strict cmdline params as deprecated
- Improve wording in Kconfig change and tweak iommu_dma_strict declaration

Differences to v11:
- Rebase to next-20210610
- Drop strict mode globals in Intel and AMD drivers
- Include patch to print strict vs lazy mode
- Include patch to remove argument from iommu_set_dma_strict()

Differences to v10:
- Rebase to v5.13-rc4
- Correct comment and typo in Kconfig (Randy)
- Make Kconfig choice depend on relevant architectures
- Update kernel-parameters.txt for CONFIG_IOMMU_DEFAULT_{LAZY,STRICT}

John Garry (3):
  iommu: Deprecate Intel and AMD cmdline methods to enable strict mode
  iommu: Print strict or lazy mode at init time
  iommu: Remove mode argument from iommu_set_dma_strict()

Zhen Lei (3):
  iommu: Enhance IOMMU default DMA mode build options
  iommu/vt-d: Add support for IOMMU default DMA mode build options
  iommu/amd: Add support for IOMMU default DMA mode build options

 .../admin-guide/kernel-parameters.txt         |  8 ++--
 drivers/iommu/Kconfig                         | 41 +++++++++++++++++++
 drivers/iommu/amd/amd_iommu_types.h           |  6 ---
 drivers/iommu/amd/init.c                      |  7 ++--
 drivers/iommu/amd/iommu.c                     |  6 ---
 drivers/iommu/intel/iommu.c                   | 16 ++++----
 drivers/iommu/iommu.c                         | 12 ++++--
 include/linux/iommu.h                         |  2 +-
 8 files changed, 66 insertions(+), 32 deletions(-)

-- 
2.26.2