[PATCH 00/13] New driver to support OpenCAPI devices on POWER9
andrew.donnellan at au1.ibm.com
Tue Dec 19 11:22:55 AEDT 2017
On 19/12/17 02:21, Frederic Barrat wrote:
> This series adds support for Open Coherent Accelerator (ocxl) devices
> on POWER9 processor. OpenCAPI is a consortium developing the
> specifications for an interface between processors and accelerators,
> allowing sharing the host memory with the accelerators, using virtual
> The OpenCAPI device can also have its own local memory and provide
> access to the host, though it is not supported by that series.
> The OpenCAPI specification is processor agnostic, but this series adds
> support specifically for powerpc.
> Even though the underlying transport is not PCI, the firmware
> abstracts the hardware like a PCI host bridge and Linux sees the
> OpenCAPI devices as PCI devices. So a lot of existing infrastructure
> and commands can be reused.
> Patches 1-5: add the platform-specific services needed by the driver
> Patches 6-10: driver code
> Patch 11: small correction to existing cxl driver
> Patch 12: documentation
> Current limitations, that will be addressed in later patches:
> - no capability to trigger a reset of the opencapi adapter
> - no support for the 'wake_host_thread' command
> - no support for adapters with a dual-link connection (none exists yet)
> - no access to the adapter-local memory
> Many people contributed directly or indirectly, from the software,
> hardware and bringup teams. In particular Andrew Donnellan and
> Alastair D'Silva, who are developing the related firmware and library.
> Feedback welcome!
The corresponding patch series for skiboot/OPAL can be found at:
Andrew Donnellan OzLabs, ADL Canberra
andrew.donnellan at au1.ibm.com IBM Australia Limited
More information about the Linux-accelerators