From: Niklas Schnelle <schnelle@linux.ibm.com>
To: Matthew Rosato <mjrosato@linux.ibm.com>,
iommu@lists.linux.dev, Joerg Roedel <joro@8bytes.org>,
Will Deacon <will@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Jason Gunthorpe <jgg@nvidia.com>
Cc: Gerd Bayer <gbayer@linux.ibm.com>,
Pierre Morel <pmorel@linux.ibm.com>,
linux-s390@vger.kernel.org, borntraeger@linux.ibm.com,
hca@linux.ibm.com, gor@linux.ibm.com,
gerald.schaefer@linux.ibm.com, agordeev@linux.ibm.com,
svens@linux.ibm.com, linux-kernel@vger.kernel.org
Subject: [PATCH v2 0/5] iommu/s390: Further improvements
Date: Wed, 9 Nov 2022 15:28:58 +0100 [thread overview]
Message-ID: <20221109142903.4080275-1-schnelle@linux.ibm.com> (raw)
Hi All,
This series of patches improves the s390 IOMMU driver. These improvements help
existing IOMMU users, mainly vfio-pci, but at the same time are also in
preparation of converting s390 to use the common DMA API implementation in
drivers/iommu/dma-iommu.c instead of its platform specific DMA API in
arch/s390/pci/pci_dma.c that sidesteps the IOMMU driver to control the same
hardware interface directly.
Among the included changes patch 1 improves the robustness of switching IOMMU
domains and patch 2 adds the I/O TLB operations necessary for the DMA API
conversion. Patches 3, 4, and 5 aim to improve performance with patch 5 being
the most intrusive by removing the I/O translation table lock and using atomic
updates instead.
This series is based on the s390 branch of Joerg's IOMMU tree[0] that includes
the latest s390 IOMMU fixes. It is available for easy testing in the
iommu_improve_v2 branch with signed tag s390_iommu_improve_v2 of my
git.kernel.org tree[1].
Best regards,
Niklas Schnelle
Changes sinve v1:
- If an IOTLB flush fails for one device don't skip the flush for other devices.
This is also needed when RCU readers try to flush a detached device. (Jason)
- Free a domain's IOMMU translation table via call_rcu() (Jason)
[0] https://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git/log/?h=s390
[1] https://git.kernel.org/pub/scm/linux/kernel/git/niks/linux.git/
Niklas Schnelle (5):
iommu/s390: Make attach succeed even if the device is in error state
iommu/s390: Add I/O TLB ops
iommu/s390: Use RCU to allow concurrent domain_list iteration
iommu/s390: Optimize IOMMU table walking
s390/pci: use lock-free I/O translation updates
arch/s390/include/asm/pci.h | 4 +-
arch/s390/kvm/pci.c | 6 +-
arch/s390/pci/pci.c | 13 +--
arch/s390/pci/pci_dma.c | 77 +++++++++------
drivers/iommu/s390-iommu.c | 184 ++++++++++++++++++++++++------------
5 files changed, 185 insertions(+), 99 deletions(-)
--
2.34.1
next reply other threads:[~2022-11-09 14:29 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-09 14:28 Niklas Schnelle [this message]
2022-11-09 14:28 ` [PATCH v2 1/5] iommu/s390: Make attach succeed even if the device is in error state Niklas Schnelle
2022-11-14 15:05 ` Gerd Bayer
2022-11-14 15:30 ` Matthew Rosato
2022-11-09 14:29 ` [PATCH v2 2/5] iommu/s390: Add I/O TLB ops Niklas Schnelle
2022-11-09 14:29 ` [PATCH v2 3/5] iommu/s390: Use RCU to allow concurrent domain_list iteration Niklas Schnelle
2022-11-09 14:29 ` [PATCH v2 4/5] iommu/s390: Optimize IOMMU table walking Niklas Schnelle
2022-11-09 14:29 ` [PATCH v2 5/5] s390/pci: use lock-free I/O translation updates Niklas Schnelle
2022-11-19 9:28 ` [PATCH v2 0/5] iommu/s390: Further improvements Joerg Roedel
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