lkml.org 
[lkml]   [2011]   [Jul]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH]: x86: print APIC data a little later during boot
Date
To view IOAPIC data you could boot with "apic=debug".
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 APIC data 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.

Signed-off-by: Naga Chumbalkar <nagananda.chumbalkar@hp.com>

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 */

\
 
 \ /
  Last update: 2011-07-08 10:39    [W:0.062 / U:0.276 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site