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Date: Fri, 8 Jul 2011 12:58:16 GMT From: tip-bot for Naga Chumbalkar <nagananda.chumbalkar@...com> To: linux-tip-commits@...r.kernel.org Cc: linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com, nagananda.chumbalkar@...com, tglx@...utronix.de, mingo@...e.hu Subject: [tip:x86/apic] x86: print APIC data a little later during boot Commit-ID: ded1f6ab43a03be74a53649cf388b5424d447584 Gitweb: http://git.kernel.org/tip/ded1f6ab43a03be74a53649cf388b5424d447584 Author: Naga Chumbalkar <nagananda.chumbalkar@...com> AuthorDate: Fri, 8 Jul 2011 08:36:34 +0000 Committer: Ingo Molnar <mingo@...e.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@...com> Link: http://lkml.kernel.org/r/20110708083555.2598.42216.sendpatchset@nchumbalkar.americas.hpqcorp.net Signed-off-by: Ingo Molnar <mingo@...e.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 */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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