From: tip-bot for Naga Chumbalkar <nagananda.chumbalkar@hp.com>
To: linux-tip-commits@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@redhat.com,
nagananda.chumbalkar@hp.com, tglx@linutronix.de, mingo@elte.hu
Subject: [tip:x86/apic] x86: print APIC data a little later during boot
Date: Fri, 8 Jul 2011 12:58:16 GMT [thread overview]
Message-ID: <tip-ded1f6ab43a03be74a53649cf388b5424d447584@git.kernel.org> (raw)
In-Reply-To: <20110708083555.2598.42216.sendpatchset@nchumbalkar.americas.hpqcorp.net>
Commit-ID: ded1f6ab43a03be74a53649cf388b5424d447584
Gitweb: http://git.kernel.org/tip/ded1f6ab43a03be74a53649cf388b5424d447584
Author: Naga Chumbalkar <nagananda.chumbalkar@hp.com>
AuthorDate: Fri, 8 Jul 2011 08:36:34 +0000
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Fri, 8 Jul 2011 13:20:14 +0200
x86: print APIC data a little later during boot
To view IOAPIC data you could boot with "apic=debug".
When booting in such a way then the kernel will dump the
IO-APIC's registers, for example:
NR Dst Mask Trig IRR Pol Stat Dmod Deli Vect:
00 000 1 0 0 0 0 0 0 00
01 000 0 0 0 0 0 0 0 31
02 000 0 0 0 0 0 0 0 30
03 000 0 0 0 0 0 0 0 33
04 000 0 0 0 0 0 0 0 34
05 000 0 0 0 0 0 0 0 35
06 000 0 0 0 0 0 0 0 36
07 000 0 0 0 0 0 0 0 37
08 000 0 0 0 0 0 0 0 38
09 000 0 1 0 0 0 0 0 39
0a 000 0 0 0 0 0 0 0 3A
0b 000 0 0 0 0 0 0 0 3B
0c 000 0 0 0 0 0 0 0 3C
0d 000 0 0 0 0 0 0 0 3D
0e 000 0 0 0 0 0 0 0 3E
0f 000 0 0 0 0 0 0 0 3F
10 000 1 0 0 0 0 0 0 00
11 000 1 0 0 0 0 0 0 00
12 000 1 0 0 0 0 0 0 00
13 000 1 0 0 0 0 0 0 00
14 000 1 0 0 0 0 0 0 00
15 000 1 0 0 0 0 0 0 00
16 000 1 0 0 0 0 0 0 00
17 000 1 0 0 0 0 0 0 00
Delaying the call to print_ICs() gives better results:
NR Dst Mask Trig IRR Pol Stat Dmod Deli Vect:
00 000 1 0 0 0 0 0 0 00
01 000 0 0 0 0 0 0 0 31
02 000 0 0 0 0 0 0 0 30
03 000 1 0 0 0 0 0 0 33
04 000 1 0 0 0 0 0 0 34
05 000 1 0 0 0 0 0 0 35
06 000 1 0 0 0 0 0 0 36
07 000 1 0 0 0 0 0 0 37
08 000 0 0 0 0 0 0 0 38
09 000 0 1 0 0 0 0 0 39
0a 000 1 0 0 0 0 0 0 3A
0b 000 1 0 0 0 0 0 0 3B
0c 000 0 0 0 0 0 0 0 3C
0d 000 1 0 0 0 0 0 0 3D
0e 000 1 0 0 0 0 0 0 3E
0f 000 1 0 0 0 0 0 0 3F
10 000 1 1 0 1 0 0 0 29
11 000 1 0 0 0 0 0 0 00
12 000 1 0 0 0 0 0 0 00
13 000 1 0 0 0 0 0 0 00
14 000 0 1 0 1 0 0 0 51
15 000 1 0 0 0 0 0 0 00
16 000 0 1 0 1 0 0 0 61
17 000 0 1 0 1 0 0 0 59
Notice that the entries beyond interrupt input signal 0x0f also
get populated and arent just the hw-initialization default of
all zeroes.
Signed-off-by: Naga Chumbalkar <nagananda.chumbalkar@hp.com>
Link: http://lkml.kernel.org/r/20110708083555.2598.42216.sendpatchset@nchumbalkar.americas.hpqcorp.net
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
arch/x86/kernel/apic/io_apic.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index e529339..98c8d7e 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -1792,7 +1792,7 @@ __apicdebuginit(int) print_ICs(void)
return 0;
}
-fs_initcall(print_ICs);
+late_initcall(print_ICs);
/* Where if anywhere is the i8259 connect in external int mode */
prev parent reply other threads:[~2011-07-08 12:58 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-08 8:36 [PATCH]: " Naga Chumbalkar
2011-07-08 12:58 ` tip-bot for Naga Chumbalkar [this message]
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=tip-ded1f6ab43a03be74a53649cf388b5424d447584@git.kernel.org \
--to=nagananda.chumbalkar@hp.com \
--cc=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-tip-commits@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=mingo@redhat.com \
--cc=tglx@linutronix.de \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
Powered by JetHome