From: Lu Baolu <baolu.lu@linux.intel.com>
To: Joerg Roedel <joro@8bytes.org>, Jason Gunthorpe <jgg@nvidia.com>,
Christoph Hellwig <hch@infradead.org>,
Kevin Tian <kevin.tian@intel.com>, Will Deacon <will@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Jean-Philippe Brucker <jean-philippe@linaro.org>
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>,
Hector Martin <marcan@marcan.st>, Sven Peter <sven@svenpeter.dev>,
Rob Clark <robdclark@gmail.com>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
Andy Gross <agross@kernel.org>,
Bjorn Andersson <andersson@kernel.org>,
Yong Wu <yong.wu@mediatek.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
Heiko Stuebner <heiko@sntech.de>,
Matthew Rosato <mjrosato@linux.ibm.com>,
Orson Zhai <orsonzhai@gmail.com>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
Chunyan Zhang <zhang.lyra@gmail.com>,
Chen-Yu Tsai <wens@csie.org>,
Thierry Reding <thierry.reding@gmail.com>,
iommu@lists.linux.dev, linux-kernel@vger.kernel.org,
Lu Baolu <baolu.lu@linux.intel.com>
Subject: [PATCH v4 00/19] iommu: Retire detach_dev callback
Date: Wed, 4 Jan 2023 20:57:06 +0800 [thread overview]
Message-ID: <20230104125725.271850-1-baolu.lu@linux.intel.com> (raw)
Hi folks,
The iommu core calls the driver's detach_dev domain op callback only when
a device is finished assigning to user space and
iommu_group_release_dma_owner() is called to return the device to the
kernel, where iommu core wants to set the default domain to the device but
the driver didn't provide one. The code looks like:
/*
* New drivers should support default domains and so the detach_dev() op
* will never be called. Otherwise the NULL domain represents some
* platform specific behavior.
*/
if (!new_domain) {
if (WARN_ON(!group->domain->ops->detach_dev))
return -EINVAL;
__iommu_group_for_each_dev(group, group->domain,
iommu_group_do_detach_device);
group->domain = NULL;
return 0;
}
In other words, if the iommu driver provides default domains, the
.detach_dev callback will never be called; Otherwise, the .detach_dev
callback is actually called to return control back to the platform DMA
ops, other than detaching the domain from device.
This series cleanups this by:
- If the IOMMU driver provides default domains, remove .detach_dev
callback.
- Adds a new set_platform_dma iommu op. Any IOMMU driver that doesn't
provide default domain should implement set_platform_dma callback
instead.
- Retire .detach_dev callback.
This series originates from various discussion in the community. Thank
Jason, Robin and all others for their ideas. This series looks very
long. It is necessary because I hope that change in each driver has a
confirmation from its stakeholder. I will then be able to merge some of
them to make the series cute.
The whole series is available on github:
https://github.com/LuBaolu/intel-iommu/commits/iommu-retire-detach_dev-v4
Please review and suggest.
Change log:
v4:
- Drop the patch which renamed .attach_dev to .set_dev. As Robin said,
"... I also wouldn't say that "attach" loses its meaning in a context
where an equivalent "detach" operation is only ever implicit in
reattaching to something else...". If we have a better name in the
future, we can do it in other series.
- Adjust the patch of "iommu: Add set_platform_dma_ops iommu ops"
according to Jason's following suggestion " ... This is a bit ugly,
it would be better to make the previous patch call set_platform_dma
if it is set instead of detach_dev and then these patches should just
rename the driver's fsl_pamu_detach_device to
fsl_pamu_set_platform_dma ..."
- Add a new patch to remove deferred attach check from
__iommu_detach_domain() path. Make it a separate patch as the
prerequisite to remove __iommu_detach_device() helper.
- Rename set_platform_dma to set_platform_dma_ops to make it more
meaningful.
v3:
- https://lore.kernel.org/linux-iommu/20221128064648.1934720-1-baolu.lu@linux.intel.com/
- Setting blocking domain is not conceptually equal to detach_dev.
Dropped all blocking domain related staffs in the previous version.
v2:
- https://lore.kernel.org/linux-iommu/20220826123014.52709-1-baolu.lu@linux.intel.com/
- Replace .detach_dev callback with static block domain ops;
- Rename .attach_dev to .set_dev.
v1:
- https://lore.kernel.org/linux-iommu/20220516015759.2952771-1-baolu.lu@linux.intel.com/
Jason Gunthorpe (1):
iommu: Remove deferred attach check from __iommu_detach_device()
Lu Baolu (18):
iommu/amd: Remove detach_dev callback
iommu/apple-dart: Remove detach_dev callback
iommu/qcom: Remove detach_dev callback
iommu/exynos: Remove detach_dev callback
iommu/ipmmu: Remove detach_dev callback
iommu/mtk: Remove detach_dev callback
iommu/rockchip: Remove detach_dev callback
iommu/sprd: Remove detach_dev callback
iommu/sun50i: Remove detach_dev callback
iommu: Add set_platform_dma_ops iommu ops
iommu/fsl_pamu: Add set_platform_dma_ops callback
iommu/msm: Add set_platform_dma_ops callback
iommu/mtk_v1: Add set_platform_dma_ops callback
iommu/omap: Add set_platform_dma_ops callback
iommu/s390: Add set_platform_dma_ops callback
iommu/gart: Add set_platform_dma_ops callback
iommu/tegra: Add set_platform_dma_ops callback
iommu: Remove detach_dev callback
include/linux/iommu.h | 8 +-
include/trace/events/iommu.h | 7 --
drivers/iommu/amd/iommu.c | 26 -------
drivers/iommu/apple-dart.c | 24 ------
drivers/iommu/arm/arm-smmu/qcom_iommu.c | 23 ------
drivers/iommu/exynos-iommu.c | 1 -
drivers/iommu/fsl_pamu_domain.c | 6 +-
drivers/iommu/iommu-traces.c | 1 -
drivers/iommu/iommu.c | 98 ++++++++++++-------------
drivers/iommu/ipmmu-vmsa.c | 16 ----
drivers/iommu/msm_iommu.c | 6 +-
drivers/iommu/mtk_iommu.c | 9 ---
drivers/iommu/mtk_iommu_v1.c | 4 +-
drivers/iommu/omap-iommu.c | 6 +-
drivers/iommu/rockchip-iommu.c | 1 -
drivers/iommu/s390-iommu.c | 7 +-
drivers/iommu/sprd-iommu.c | 16 ----
drivers/iommu/sun50i-iommu.c | 1 -
drivers/iommu/tegra-gart.c | 6 +-
drivers/iommu/tegra-smmu.c | 5 +-
20 files changed, 73 insertions(+), 198 deletions(-)
--
2.34.1
next reply other threads:[~2023-01-04 13:05 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-04 12:57 Lu Baolu [this message]
2023-01-04 12:57 ` [PATCH v4 01/19] iommu/amd: Remove detach_dev callback Lu Baolu
2023-01-09 11:47 ` Vasant Hegde
2023-01-04 12:57 ` [PATCH v4 02/19] iommu/apple-dart: " Lu Baolu
2023-01-04 12:57 ` [PATCH v4 03/19] iommu/qcom: " Lu Baolu
2023-01-04 12:57 ` [PATCH v4 04/19] iommu/exynos: " Lu Baolu
2023-01-04 12:57 ` [PATCH v4 05/19] iommu/ipmmu: " Lu Baolu
2023-01-04 12:57 ` [PATCH v4 06/19] iommu/mtk: " Lu Baolu
2023-01-04 13:14 ` Jason Gunthorpe
2023-01-04 12:57 ` [PATCH v4 07/19] iommu/rockchip: " Lu Baolu
2023-01-04 12:57 ` [PATCH v4 08/19] iommu/sprd: " Lu Baolu
2023-01-04 12:57 ` [PATCH v4 09/19] iommu/sun50i: " Lu Baolu
2023-01-04 12:57 ` [PATCH v4 10/19] iommu: Add set_platform_dma_ops iommu ops Lu Baolu
2023-01-04 13:17 ` Jason Gunthorpe
2023-01-05 5:58 ` Baolu Lu
2023-01-05 13:15 ` Jason Gunthorpe
2023-01-06 6:07 ` Baolu Lu
2023-01-06 14:26 ` Jason Gunthorpe
2023-01-07 2:48 ` Baolu Lu
2023-01-09 12:17 ` Jason Gunthorpe
2023-01-04 12:57 ` [PATCH v4 11/19] iommu/fsl_pamu: Add set_platform_dma_ops callback Lu Baolu
2023-01-04 13:19 ` Jason Gunthorpe
2023-01-04 12:57 ` [PATCH v4 12/19] iommu/msm: " Lu Baolu
2023-01-04 13:19 ` Jason Gunthorpe
2023-01-04 12:57 ` [PATCH v4 13/19] iommu/mtk_v1: " Lu Baolu
2023-01-04 13:19 ` Jason Gunthorpe
2023-01-04 12:57 ` [PATCH v4 14/19] iommu/omap: " Lu Baolu
2023-01-04 13:19 ` Jason Gunthorpe
2023-01-04 12:57 ` [PATCH v4 15/19] iommu/s390: " Lu Baolu
2023-01-04 13:20 ` Jason Gunthorpe
2023-01-04 12:57 ` [PATCH v4 16/19] iommu/gart: " Lu Baolu
2023-01-04 13:20 ` Jason Gunthorpe
2023-01-04 12:57 ` [PATCH v4 17/19] iommu/tegra: " Lu Baolu
2023-01-04 13:20 ` Jason Gunthorpe
2023-01-04 12:57 ` [PATCH v4 18/19] iommu: Remove deferred attach check from __iommu_detach_device() Lu Baolu
2023-01-04 12:57 ` [PATCH v4 19/19] iommu: Remove detach_dev callback Lu Baolu
2023-01-04 13:22 ` Jason Gunthorpe
2023-01-05 6:41 ` Baolu Lu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20230104125725.271850-1-baolu.lu@linux.intel.com \
--to=baolu.lu@linux.intel.com \
--cc=agross@kernel.org \
--cc=andersson@kernel.org \
--cc=baolin.wang@linux.alibaba.com \
--cc=hch@infradead.org \
--cc=heiko@sntech.de \
--cc=iommu@lists.linux.dev \
--cc=jean-philippe@linaro.org \
--cc=jgg@nvidia.com \
--cc=joro@8bytes.org \
--cc=kevin.tian@intel.com \
--cc=krzysztof.kozlowski@linaro.org \
--cc=linux-kernel@vger.kernel.org \
--cc=m.szyprowski@samsung.com \
--cc=marcan@marcan.st \
--cc=matthias.bgg@gmail.com \
--cc=mjrosato@linux.ibm.com \
--cc=orsonzhai@gmail.com \
--cc=robdclark@gmail.com \
--cc=robin.murphy@arm.com \
--cc=suravee.suthikulpanit@amd.com \
--cc=sven@svenpeter.dev \
--cc=thierry.reding@gmail.com \
--cc=wens@csie.org \
--cc=will@kernel.org \
--cc=yong.wu@mediatek.com \
--cc=zhang.lyra@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).