Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
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 0/5] iommu/s390: Further improvements
Date:   Tue, 18 Oct 2022 16:51:27 +0200
Message-Id: <20221018145132.998866-1-schnelle@linux.ibm.com>
Content-Transfer-Encoding: 8bit
MIME-Version: 1.0
Precedence: bulk

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 goes on top of v7 of my previous series of IOMMU fixes[0] and
similarly is available for easy testing in the iommu_improve_v1 branch with
signed tag s390_iommu_improve_v1 of my git.kernel.org tree[1].

Best regards,
Niklas Schnelle

[0] https://lore.kernel.org/linux-iommu/20221017124558.1386337-1-schnelle@linux.ibm.com/
[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  | 180 ++++++++++++++++++++++++------------
 5 files changed, 183 insertions(+), 97 deletions(-)

-- 
2.34.1