From: Lu Baolu <baolu.lu@linux.intel.com>
To: iommu@lists.linux.dev
Cc: 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>,
linux-kernel@vger.kernel.org, Lu Baolu <baolu.lu@linux.intel.com>
Subject: [PATCH v2 0/6] iommu: Extend changing default domain to normal group
Date: Fri, 17 Feb 2023 17:47:30 +0800 [thread overview]
Message-ID: <20230217094736.159005-1-baolu.lu@linux.intel.com> (raw)
The IOMMU group sysfs interface allows users to change the default
domain of a group. The current implementation uses device_lock() to make
sure that the devices in the group are not bound to any driver and won't
be bound during the process of changing the default domain. In order to
avoid a possible deadlock caused by lock order of device_lock and
group->mutex, it limits the functionality to singleton groups only.
The recently implemented DMA ownership framework can be applied here to
replace device_lock(). In addition, use group->mutex to ensure that the
iommu ops of the devices is always valid during the process of changing
default domain.
With above replacement and enhancement, the device_lock() could be
removed and the singleton-group-only limitation could be removed.
The whole series is also available on github:
https://github.com/LuBaolu/intel-iommu/commits/iommu-sysfs-default-domain-extension-v2
This series is on top of below series from Robin,
https://lore.kernel.org/linux-iommu/cover.1674753627.git.robin.murphy@arm.com/
Please help to review and suggest.
Change log:
v2:
- Use group->mutex instead of an additional rw lock.
v1: initial post
- https://lore.kernel.org/linux-iommu/20230213074941.919324-1-baolu.lu@linux.intel.com/
Lu Baolu (6):
ARM/dma-mapping: Remove iommu_detach_device()
iommu: Split iommu_group_remove_device() into helpers
iommu: Same critical region for device release and removal
iommu: Move lock from iommu_change_dev_def_domain() to its caller
iommu: Replace device_lock() with group->mutex
iommu: Cleanup iommu_change_dev_def_domain()
arch/arm/mm/dma-mapping.c | 1 -
drivers/iommu/iommu.c | 255 +++++++-----------
.../ABI/testing/sysfs-kernel-iommu_groups | 1 -
3 files changed, 102 insertions(+), 155 deletions(-)
--
2.34.1
next reply other threads:[~2023-02-17 9:56 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-17 9:47 Lu Baolu [this message]
2023-02-17 9:47 ` [PATCH v2 1/6] ARM/dma-mapping: Remove iommu_detach_device() Lu Baolu
2023-02-17 15:39 ` Jason Gunthorpe
2023-02-18 6:59 ` Baolu Lu
2023-02-18 15:58 ` Jason Gunthorpe
2023-02-20 14:21 ` Robin Murphy
2023-02-17 9:47 ` [PATCH v2 2/6] iommu: Split iommu_group_remove_device() into helpers Lu Baolu
2023-02-17 9:47 ` [PATCH v2 3/6] iommu: Same critical region for device release and removal Lu Baolu
2023-02-17 15:40 ` Jason Gunthorpe
2023-02-18 7:29 ` Baolu Lu
2023-02-21 1:13 ` Jason Gunthorpe
2023-02-17 9:47 ` [PATCH v2 4/6] iommu: Move lock from iommu_change_dev_def_domain() to its caller Lu Baolu
2023-02-17 9:47 ` [PATCH v2 5/6] iommu: Replace device_lock() with group->mutex Lu Baolu
2023-02-17 9:47 ` [PATCH v2 6/6] iommu: Cleanup iommu_change_dev_def_domain() Lu Baolu
2023-02-17 15:47 ` [PATCH v2 0/6] iommu: Extend changing default domain to normal group Jason Gunthorpe
2023-02-18 7:31 ` 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=20230217094736.159005-1-baolu.lu@linux.intel.com \
--to=baolu.lu@linux.intel.com \
--cc=hch@infradead.org \
--cc=iommu@lists.linux.dev \
--cc=jgg@nvidia.com \
--cc=joro@8bytes.org \
--cc=kevin.tian@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=robin.murphy@arm.com \
--cc=will@kernel.org \
/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).