lkml.org 
[lkml]   [2016]   [Oct]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRE: Why MSI is limited to 32 interrupts maximum
Date
 > On Sat, 15 Oct 2016 12:37:55 +0000
> Bharat Kumar Gogada <bharat.kumar.gogada@xilinx.com> wrote:
>
> Hi Bharat,
>
> > Can anyone tell why MSI interrupts are limited to maximum 32
> > interrupts, even though we have 16bit message data register ?
>
> That's the very definition of the original PCI MSI: Up to 32 consecutive interrupts
> per function, and a single doorbell address.
> MSI-X lifts that restriction and offers up to 2048 interrupts that do not have to
> be contiguous can target individual doorbells. Assuming your MSI controller
> advertises MSI-X support and that your devices do support it as well, you'll be
> able to enjoy those.
>

Thanks Marc, so then only 5 bits of message data register will be used, so what is the purpose rest of the bits ?

> >
> > Regards,
> > Bharat
> >
> >
> > This email and any attachments are intended for the sole use of the
> > named recipient(s) and contain(s) confidential information that may be
> > proprietary, privileged or copyrighted under applicable law. If you
> > are not the intended recipient, do not read, copy, or forward this
> > email message or any attachments. Delete this email message and any
> > attachments immediately.
> >
>
> Please fix your email not to carry such disclaimer (or use a private email address
> if you can't work around your company policy). Posting confidential information
> on a public mailing list feels a bit silly.
>
> Thanks,
>
> M.
> --
> Without deviation from the norm, progress is not possible.

\
 
 \ /
  Last update: 2016-10-15 15:46    [W:0.087 / U:0.288 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site