linux-kernel - Re: [PATCH 7/7] ocxl: Document new OCXL IOCTLs

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Message-Id: <ad475a7c-68dc-899b-28ec-8d4619e18105@au1.ibm.com>
Date:   Tue, 17 Apr 2018 13:45:20 +1000
From:   Andrew Donnellan <andrew.donnellan@....ibm.com>
To:     "Alastair D'Silva" <alastair@....ibm.com>,
        linuxppc-dev@...ts.ozlabs.org
Cc:     linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        mikey@...ling.org, vaibhav@...ux.vnet.ibm.com,
        aneesh.kumar@...ux.vnet.ibm.com, malat@...ian.org,
        felix@...ux.vnet.ibm.com, pombredanne@...b.com,
        sukadev@...ux.vnet.ibm.com, npiggin@...il.com,
        gregkh@...uxfoundation.org, arnd@...db.de,
        fbarrat@...ux.vnet.ibm.com, corbet@....net,
        "Alastair D'Silva" <alastair@...ilva.org>
Subject: Re: [PATCH 7/7] ocxl: Document new OCXL IOCTLs

On 17/04/18 12:09, Alastair D'Silva wrote:
> From: Alastair D'Silva <alastair@...ilva.org>
> 
> Signed-off-by: Alastair D'Silva <alastair@...ilva.org>
> ---
>   Documentation/accelerators/ocxl.rst | 10 ++++++++++
>   1 file changed, 10 insertions(+)
> 
> diff --git a/Documentation/accelerators/ocxl.rst b/Documentation/accelerators/ocxl.rst
> index ddcc58d01cfb..144595a80a1c 100644
> --- a/Documentation/accelerators/ocxl.rst
> +++ b/Documentation/accelerators/ocxl.rst
> @@ -157,6 +157,16 @@ OCXL_IOCTL_GET_METADATA:
>     Obtains configuration information from the card, such at the size of
>     MMIO areas, the AFU version, and the PASID for the current context.
>   
> +OCXL_IOCTL_ENABLE_P9_WAIT:
> +
> +  Allows the AFU to wake a userspace thread executing 'wait'. Returns
> +  information to userspace to allow it to configure the AFU.

Note that this is only available on POWER9.

> +
> +OCXL_IOCTL_GET_PLATFORM:
> +
> +  Notifies userspace as to the platform the kernel believes we are on,
> +  which may differ from what userspace believes. Also reports on which CPU
> +  features which are usable from userspace.

The first sentence here doesn't seem to relate to anything that 
GET_PLATFORM actually does - afaict you're just passing flags which I 
suppose imply what the correct platform is, but really they're just 
feature flags?

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