Messages in this thread |  | | Date | Sat, 15 Oct 2016 14:14:01 +0100 | From | Marc Zyngier <> | Subject | Re: Why MSI is limited to 32 interrupts maximum |
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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.
> > 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.
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