[PATCH v7 00/24] iommu: Shared Virtual Addressing for SMMUv3

Jean-Philippe Brucker
2020-05-19T18:01:57Z

Shared Virtual Addressing (SVA) allows to share process page tables with
devices using the IOMMU, PASIDs and I/O page faults. Add SVA support to
the Arm SMMUv3 driver.

Since v6 [1]:
* Rename ioasid_free() to ioasid_put() in patch 02, requiring changes to
the Intel drivers.
* Use mmu_notifier_register() in patch 16 to avoid copying the ops and
simplify the invalidate() notifier in patch 17.
* As a result, replace context spinlock with a mutex. Simplified locking in
patch 11 (That patch still looks awful, but I think the series is more
readable overall). And I've finally been able to remove the GFP_ATOMIC
allocations.
* Use a single patch (04) for io-pgfault.c, since the code was simplified
in v6. Fixed partial list in patch 04.

[1] https://lore.kernel.org/linux-iommu/20200430143424.2787566-1-jean-philippe@linaro.org/

Jean-Philippe Brucker (24):
mm: Add a PASID field to mm_struct
iommu/ioasid: Add ioasid references
iommu/sva: Add PASID helpers
iommu: Add a page fault handler
arm64: mm: Add asid_gen_match() helper
arm64: mm: Pin down ASIDs for sharing mm with devices
iommu/io-pgtable-arm: Move some definitions to a header
iommu/arm-smmu-v3: Manage ASIDs with xarray
arm64: cpufeature: Export symbol read_sanitised_ftr_reg()
iommu/arm-smmu-v3: Share process page tables
iommu/arm-smmu-v3: Seize private ASID
iommu/arm-smmu-v3: Add support for VHE
iommu/arm-smmu-v3: Enable broadcast TLB maintenance
iommu/arm-smmu-v3: Add SVA feature checking
iommu/arm-smmu-v3: Add SVA device feature
iommu/arm-smmu-v3: Implement iommu_sva_bind/unbind()
iommu/arm-smmu-v3: Hook up ATC invalidation to mm ops
iommu/arm-smmu-v3: Add support for Hardware Translation Table Update
iommu/arm-smmu-v3: Maintain a SID->device structure
dt-bindings: document stall property for IOMMU masters
iommu/arm-smmu-v3: Add stall support for platform devices
PCI/ATS: Add PRI stubs
PCI/ATS: Export PRI functions
iommu/arm-smmu-v3: Add support for PRI

drivers/iommu/Kconfig | 12 +
drivers/iommu/Makefile | 2 +
.../devicetree/bindings/iommu/iommu.txt | 18 +
arch/arm64/include/asm/mmu.h | 1 +
arch/arm64/include/asm/mmu_context.h | 11 +-
drivers/iommu/io-pgtable-arm.h | 30 +
drivers/iommu/iommu-sva.h | 15 +
include/linux/ioasid.h | 10 +-
include/linux/iommu.h | 53 +
include/linux/mm_types.h | 4 +
include/linux/pci-ats.h | 8 +
arch/arm64/kernel/cpufeature.c | 1 +
arch/arm64/mm/context.c | 103 +-
drivers/iommu/arm-smmu-v3.c | 1552 +++++++++++++++--
drivers/iommu/intel-iommu.c | 4 +-
drivers/iommu/intel-svm.c | 6 +-
drivers/iommu/io-pgfault.c | 459 +++++
drivers/iommu/io-pgtable-arm.c | 27 +-
drivers/iommu/ioasid.c | 38 +-
drivers/iommu/iommu-sva.c | 85 +
drivers/iommu/of_iommu.c | 5 +-
drivers/pci/ats.c | 4 +
MAINTAINERS | 3 +-
23 files changed, 2286 insertions(+), 165 deletions(-)
create mode 100644 drivers/iommu/io-pgtable-arm.h
create mode 100644 drivers/iommu/iommu-sva.h
create mode 100644 drivers/iommu/io-pgfault.c
create mode 100644 drivers/iommu/iommu-sva.c