linux-kernel - [PATCH v15 0/6] iommu: Enhance IOMMU default DMA mode build options

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Date:   Mon, 12 Jul 2021 19:12:14 +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>,
        <dianders@...omium.org>, John Garry <john.garry@...wei.com>
Subject: [PATCH v15 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.

Based on v5.14-rc1

Differences to v14:
- Add RB tags (Thanks!)
- Rebase

Differences to v13:
- Improve strict mode deprecation messages and cut out some
  kernel-parameters.txt legacy description
- Add tag in 1/6
- use pr_info_once() for vt-d message about VM and caching

Differences to v12:
- Add Robin's RB tags (thanks!)
- Add a patch to mark x86 strict cmdline params as deprecated
- Improve wording in Kconfig change and tweak iommu_dma_strict declaration

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         | 12 ++----
 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, 65 insertions(+), 37 deletions(-)

-- 
2.26.2