linux-kernel - Re: [PATCH 00/13] New driver to support OpenCAPI devices on POWER9

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Date:   Tue, 19 Dec 2017 11:22:55 +1100
From:   Andrew Donnellan <andrew.donnellan@....ibm.com>
To:     Frederic Barrat <fbarrat@...ux.vnet.ibm.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Cc:     arnd@...db.de, gregkh@...uxfoundation.org, mpe@...erman.id.au,
        alastair@....ibm.com, linux-accelerators@...ts.ozlabs.org
Subject: Re: [PATCH 00/13] New driver to support OpenCAPI devices on POWER9

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
> addresses.
> 
> 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!

[+ linux-accelerators]

The corresponding patch series for skiboot/OPAL can be found at:

     https://patchwork.ozlabs.org/project/skiboot/list/?series=19043


Andrew

-- 
Andrew Donnellan              OzLabs, ADL Canberra
andrew.donnellan@....ibm.com  IBM Australia Limited