lkml.org 
[lkml]   [2019]   [Mar]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 03/17] fpga: dfl: fme: support 512bit data width PR
On Wed, Mar 27, 2019 at 01:10:31AM -0500, Scott Wood wrote:
> On Wed, 2019-03-27 at 12:37 +0800, Wu Hao wrote:
> > On Tue, Mar 26, 2019 at 04:22:34PM -0500, Scott Wood wrote:
> > > On Tue, 2019-03-26 at 14:33 -0500, Alan Tull wrote:
> > > > On Mon, Mar 25, 2019 at 5:58 PM Scott Wood <swood@redhat.com> wrote:
> > > > > >
> > > > Hi Scott,
> > > >
> > > > > On Mon, 2019-03-25 at 17:53 -0500, Scott Wood wrote:
> > > > > > On Mon, 2019-03-25 at 11:07 +0800, Wu Hao wrote:
> > > > > > > +#else
> > > > > > > +static inline void copy512(void *src, void __iomem *dst)
> > > > > > > +{
> > > > > > > + WARN_ON_ONCE(1);
> > > > > > > +}
> > > > > > > +#endif
> > > > > >
> Likewise, this will be called if a revision 2 device is used on non-
> > > > > > x86
> > > > > > (or on x86 with an old binutils). The driver should fall back to
> > > > > > 32-
> > > > > > bit
> > > > > > in such cases.
> >
> > Unfortunately revision 2 is only for integrated FPGA solution, and it
> > doesn't
> > support any fallback solution (original 32bit data partial reconfiguration
> > is
> > not supported any more), so driver has to WARN in such path.
>
> >From the commit message it seemed like this was just an optimization, not
> something necessary to support revision 2.
>
> If there's no way to program the device without AVX512, then printing an
> error message and returning an error to userspace would be better than
> WARN_ON, since it's not actually a kernel bug.

Fair enough. Will do. Thanks for the suggestion.

Hao

>
> -Scott
>

\
 
 \ /
  Last update: 2019-03-27 07:20    [W:0.687 / U:0.116 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site