Re: [PATCH v2 00/24] iommu: Refactor DMA domain strictness

chenxiang (M)
2021-07-29T02:57:47Z

Hi Robin,

在 2021/7/28 23:58, Robin Murphy 写道:
> Hi all,
>
> Here's v2 where things start to look more realistic, hence the expanded
> CC list. The patches are now based on the current iommu/core branch to
> take John's iommu_set_dma_strict() cleanup into account.
>
> The series remiains in two (or possibly 3) logical parts - for people
> CC'd on cookie cleanup patches, the later parts should not affect you
> since your drivers don't implement non-strict mode anyway; the cleanup
> is all pretty straightforward, but please do yell at me if I've managed
> to let a silly mistake slip through and broken your driver.
>
> This time I have also build-tested x86 as well as arm64 :)

I have tested those patchset on ARM64 with SMMUV3, and the testcases are
as follows:
- Boot with iommu.strict=0, running fio and it works well;
- Boot with iommu.strict=1, running fio and it works well;
- Change strict mode to lazy mode when building, the change takes effect;
- Boot without iommu.strict(default strict mode), change the sysfs
interface type from DMA to DMA-FQ dynamically during running fio, and it
works well;
- Boot without iommu.strict(default strict mode), change the sysfs
interface type from DMA-FQ to DMA dynamically, and it is not allowed and
print "Device or resource busy"
(i know it is qualified, and we can change no-strict mode to strict by
unbind the driver -> change the sysfs interface (type)->bind the driver
(tested this and it works well),
but i have a small question: is it also possible to change from DMA-FQ
to DMA dynamically? )

Anyway, please feel free to add :
Tested-by: Xiang Chen <chenxiang66@hisilicon.com>

>
> Changes in v2:
>
> - Add iommu_is_dma_domain() helper to abstract flag check (and help
> avoid silly typos like the one in v1).
> - Tweak a few commit messages for spelling and (hopefully) clarity.
> - Move the iommu_create_device_direct_mappings() update to patch #14
> where it should have been.
> - Rewrite patch #20 as a conversion of the now-existing option.
> - Clean up the ops->flush_iotlb_all check which is also made redundant
> by the new domain type
> - Add patch #24, which is arguably tangential, but it was something I
> spotted during the rebase, so...
>
> Once again, the whole lot is available on a branch here:
>
> https://gitlab.arm.com/linux-arm/linux-rm/-/tree/iommu/fq
>
> Thanks,
> Robin.
>
>
> CC: Marek Szyprowski <m.szyprowski@samsung.com>
> CC: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
> CC: Geert Uytterhoeven <geert+renesas@glider.be>
> CC: Yong Wu <yong.wu@mediatek.com>
> CC: Heiko Stuebner <heiko@sntech.de>
> CC: Chunyan Zhang <chunyan.zhang@unisoc.com>
> CC: Chunyan Zhang <chunyan.zhang@unisoc.com>
> CC: Maxime Ripard <mripard@kernel.org>
> CC: Jean-Philippe Brucker <jean-philippe@linaro.org>
>
> Robin Murphy (24):
> iommu: Pull IOVA cookie management into the core
> iommu/amd: Drop IOVA cookie management
> iommu/arm-smmu: Drop IOVA cookie management
> iommu/vt-d: Drop IOVA cookie management
> iommu/exynos: Drop IOVA cookie management
> iommu/ipmmu-vmsa: Drop IOVA cookie management
> iommu/mtk: Drop IOVA cookie management
> iommu/rockchip: Drop IOVA cookie management
> iommu/sprd: Drop IOVA cookie management
> iommu/sun50i: Drop IOVA cookie management
> iommu/virtio: Drop IOVA cookie management
> iommu/dma: Unexport IOVA cookie management
> iommu/dma: Remove redundant "!dev" checks
> iommu: Introduce explicit type for non-strict DMA domains
> iommu/amd: Prepare for multiple DMA domain types
> iommu/arm-smmu: Prepare for multiple DMA domain types
> iommu/vt-d: Prepare for multiple DMA domain types
> iommu: Express DMA strictness via the domain type
> iommu: Expose DMA domain strictness via sysfs
> iommu: Merge strictness and domain type configs
> iommu/dma: Factor out flush queue init
> iommu: Allow enabling non-strict mode dynamically
> iommu/arm-smmu: Allow non-strict in pgtable_quirks interface
> iommu: Only log strictness for DMA domains
>
> .../ABI/testing/sysfs-kernel-iommu_groups | 2 +
> drivers/iommu/Kconfig | 80 +++++++++----------
> drivers/iommu/amd/iommu.c | 21 +----
> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 25 ++++--
> drivers/iommu/arm/arm-smmu/arm-smmu.c | 29 ++++---
> drivers/iommu/arm/arm-smmu/qcom_iommu.c | 8 --
> drivers/iommu/dma-iommu.c | 44 +++++-----
> drivers/iommu/exynos-iommu.c | 18 +----
> drivers/iommu/intel/iommu.c | 23 ++----
> drivers/iommu/iommu.c | 53 +++++++-----
> drivers/iommu/ipmmu-vmsa.c | 27 +------
> drivers/iommu/mtk_iommu.c | 6 --
> drivers/iommu/rockchip-iommu.c | 11 +--
> drivers/iommu/sprd-iommu.c | 6 --
> drivers/iommu/sun50i-iommu.c | 12 +--
> drivers/iommu/virtio-iommu.c | 8 --
> include/linux/dma-iommu.h | 9 ++-
> include/linux/iommu.h | 15 +++-
> 18 files changed, 171 insertions(+), 226 deletions(-)