linux-kernel - Re: [PATCH v2 6/7] ocxl: Add an IOCTL so userspace knows what CPU features are available

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Message-Id: <1525751671.7796.49.camel@au1.ibm.com>
Date:   Tue, 08 May 2018 13:54:31 +1000
From:   "Alastair D'Silva" <alastair@....ibm.com>
To:     Nicholas Piggin <npiggin@...il.com>
Cc:     Frederic Barrat <fbarrat@...ux.ibm.com>,
        linuxppc-dev@...ts.ozlabs.org, 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, gregkh@...uxfoundation.org,
        arnd@...db.de, andrew.donnellan@....ibm.com,
        fbarrat@...ux.vnet.ibm.com, corbet@....net
Subject: Re: [PATCH v2 6/7] ocxl: Add an IOCTL so userspace knows what CPU
 features are available

On Tue, 2018-05-08 at 13:50 +1000, Nicholas Piggin wrote:
> On Tue, 08 May 2018 10:41:55 +1000
> "Alastair D'Silva" <alastair@....ibm.com> wrote:
> 
> > On Mon, 2018-05-07 at 20:14 +0200, Frederic Barrat wrote:
> > > 
> > > Le 18/04/2018 à 03:08, Alastair D'Silva a écrit :  
> > > > From: Alastair D'Silva <alastair@...ilva.org>
> > > > 
> > > > In order for a userspace AFU driver to call the Power9 specific
> > > > OCXL_IOCTL_ENABLE_P9_WAIT, it needs to verify that it can
> > > > actually
> > > > make that call.
> > > > 
> > > > Signed-off-by: Alastair D'Silva <alastair@...ilva.org>
> > > > ---
> > > >   Documentation/accelerators/ocxl.rst |  1 -
> > > >   drivers/misc/ocxl/file.c            | 25
> > > > +++++++++++++++++++++++++
> > > >   include/uapi/misc/ocxl.h            |  4 ++++
> > > >   3 files changed, 29 insertions(+), 1 deletion(-)
> > > > 
> > > > diff --git a/Documentation/accelerators/ocxl.rst
> > > > b/Documentation/accelerators/ocxl.rst
> > > > index ddcc58d01cfb..7904adcc07fd 100644
> > > > --- a/Documentation/accelerators/ocxl.rst
> > > > +++ b/Documentation/accelerators/ocxl.rst
> > > > @@ -157,7 +157,6 @@ 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.
> > > > 
> > > > -  
> > > 
> > > 
> > > Intended?
> > > 
> > > Other than that,
> > > Acked-by: Frederic Barrat <fbarrat@...ux.vnet.ibm.com>
> > >   
> > 
> > Nope, I'll fix that, thanks.
> > 
> 
> Just to be clear, this is for OCXL features. I would just make that
> explicit in the title (s/CPU/OCXL).
> 
> Thanks,
> Nick
> 

OK, sounds reasonable.

-- 
Alastair D'Silva
Open Source Developer
Linux Technology Centre, IBM Australia
mob: 0423 762 819