| Message ID | 20210526161927.24268-1-jean-philippe@linaro.org |
|---|---|
| Headers | show |
| Series | iommu/arm-smmu-v3: Add stall support | expand |
On Wed, 26 May 2021 18:19:25 +0200, Jean-Philippe Brucker wrote: > Add stall support for SMMUv3, enabling I/O page faults and SVA for > compatible devices. No change since last version [1], but I'd still like > this to be considered for upstream, because there exists hardware and > applications. > > Stall is implemented by the Kunpeng 920 processor for its compression > and crypto accelerators, with which I tested the SVA infrastructure. > Using the userspace accelerator API [2], a program can obtain a queue > from one of these devices and submit compression or encryption work > within the program's address space. UADK [3] provides a library to do > this, and there is an openssl plugin [4] to use it. > > [...] Applied to will (for-joerg/arm-smmu/updates), thanks! [1/3] dt-bindings: document stall property for IOMMU masters https://git.kernel.org/will/c/ed1d08b9d0c9 [2/3] ACPI/IORT: Enable stall support for platform devices https://git.kernel.org/will/c/6522b1e0c78f [3/3] iommu/arm-smmu-v3: Add stall support for platform devices https://git.kernel.org/will/c/395ad89d11fd Cheers, -- Will https://fixes.arm64.dev https://next.arm64.dev https://will.arm64.dev
On Tue, Jun 08, 2021 at 12:42:34PM +0100, Will Deacon wrote: > On Wed, 26 May 2021 18:19:25 +0200, Jean-Philippe Brucker wrote: > > Add stall support for SMMUv3, enabling I/O page faults and SVA for > > compatible devices. No change since last version [1], but I'd still like > > this to be considered for upstream, because there exists hardware and > > applications. > > > > Stall is implemented by the Kunpeng 920 processor for its compression > > and crypto accelerators, with which I tested the SVA infrastructure. > > Using the userspace accelerator API [2], a program can obtain a queue > > from one of these devices and submit compression or encryption work > > within the program's address space. UADK [3] provides a library to do > > this, and there is an openssl plugin [4] to use it. > > > > [...] > > Applied to will (for-joerg/arm-smmu/updates), thanks! > > [1/3] dt-bindings: document stall property for IOMMU masters > https://git.kernel.org/will/c/ed1d08b9d0c9 > [2/3] ACPI/IORT: Enable stall support for platform devices > https://git.kernel.org/will/c/6522b1e0c78f > [3/3] iommu/arm-smmu-v3: Add stall support for platform devices > https://git.kernel.org/will/c/395ad89d11fd > Thanks! That concludes most of the SVA work. For SMMUv3 we still need to figure out DVM, there will be PRI at some point, and I'm sure some bugfixes but I don't plan to send any other major feature support for the next cycles. Thanks, Jean
Add stall support for SMMUv3, enabling I/O page faults and SVA for compatible devices. No change since last version [1], but I'd still like this to be considered for upstream, because there exists hardware and applications. Stall is implemented by the Kunpeng 920 processor for its compression and crypto accelerators, with which I tested the SVA infrastructure. Using the userspace accelerator API [2], a program can obtain a queue from one of these devices and submit compression or encryption work within the program's address space. UADK [3] provides a library to do this, and there is an openssl plugin [4] to use it. That's probably as far as we can go in terms of real users of SVA at the moment, since userspace won't progress much further without upstream kernel support - these three patches. Stall is only enabled if the firmware declares that the device supports stalling (explicit flags from patches 1 and 2) or, in the case of the Kunpeng 920, with a quirk [5]. If that property is not set, stall will still be disabled in the STE and CD, and this series should not have any negative impact on existing systems. [1] https://lore.kernel.org/linux-iommu/20210401154718.307519-1-jean-philippe@linaro.org/ [2] Documentation/misc-devices/uacce.rst [3] https://github.com/Linaro/uadk [4] https://github.com/Linaro/openssl-uadk [5] https://lore.kernel.org/linux-pci/1615258837-12189-1-git-send-email-zhangfei.gao@linaro.org/ FWIW future devices should implement PRI: https://lore.kernel.org/linux-pci/5FD9EE6E.1040505@hisilicon.com/ Jean-Philippe Brucker (3): dt-bindings: document stall property for IOMMU masters ACPI/IORT: Enable stall support for platform devices iommu/arm-smmu-v3: Add stall support for platform devices .../devicetree/bindings/iommu/iommu.txt | 18 ++ drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 43 ++++ drivers/acpi/arm64/iort.c | 4 +- .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 59 +++++- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 196 +++++++++++++++++- 5 files changed, 304 insertions(+), 16 deletions(-)