From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Rob Landley <rob@landley.net>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,
Sergey Shtylyov <s.shtylyov@omp.ru>,
Rich Felker <dalias@libc.org>,
Linux-sh list <linux-sh@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Yoshinori Sato <ysato@users.sourceforge.jp>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: [PATCH v3] sh: avoid using IRQ0 on SH3/4
Date: Tue, 3 May 2022 09:02:11 +0200 [thread overview]
Message-ID: <CAMuHMdUZ-fTKPk1kXodjg1yi5vm3RZJ=wO9o5afA81yNvt0KYA@mail.gmail.com> (raw)
In-Reply-To: <2a3f8b4c-2c0d-28bc-8dcd-c56c7b8a2bb4@landley.net>
Hi Rob,
On Mon, May 2, 2022 at 10:02 PM Rob Landley <rob@landley.net> wrote:
> Sounds like it's now outside of the IRQ range allocation, but I can't find where
> that's requested when registering the controller? (What is a "swizzle" anyway?)
PCI slots have 4 interrupts (#A, #B, #C, #D). In machines with
multiple slots, the interrupts lines are "swizzled", to avoid that all cards
using a single interrupt are mapped to the same host interrupt.
Typically, the mapping is:
host_irq = bus_irqs[(slot + irq_pin) % 4];
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
next prev parent reply other threads:[~2022-05-03 7:02 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-27 18:46 [PATCH v3] sh: avoid using IRQ0 on SH3/4 Sergey Shtylyov
2022-04-27 19:24 ` Sergey Shtylyov
2022-04-29 14:24 ` John Paul Adrian Glaubitz
2022-04-29 14:39 ` Greg Kroah-Hartman
2022-04-29 17:16 ` Rich Felker
2022-05-01 17:58 ` Sergey Shtylyov
2022-05-01 18:09 ` Sergey Shtylyov
2022-04-30 10:30 ` Rob Landley
2022-05-01 10:19 ` John Paul Adrian Glaubitz
2022-05-02 8:37 ` Geert Uytterhoeven
2022-05-02 20:07 ` Rob Landley
2022-05-03 7:02 ` Geert Uytterhoeven [this message]
2022-05-03 19:46 ` Maciej W. Rozycki
2022-05-02 20:56 ` Sergey Shtylyov
2022-05-03 6:58 ` Geert Uytterhoeven
2022-05-03 19:33 ` Sergey Shtylyov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CAMuHMdUZ-fTKPk1kXodjg1yi5vm3RZJ=wO9o5afA81yNvt0KYA@mail.gmail.com' \
--to=geert@linux-m68k.org \
--cc=dalias@libc.org \
--cc=glaubitz@physik.fu-berlin.de \
--cc=gregkh@linuxfoundation.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-sh@vger.kernel.org \
--cc=rob@landley.net \
--cc=s.shtylyov@omp.ru \
--cc=ysato@users.sourceforge.jp \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.