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:

quoted

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


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