summaryrefslogtreecommitdiffstats
path: root/arch/x86/kernel/apic
diff options
context:
space:
mode:
authorNaga Chumbalkar <nagananda.chumbalkar@hp.com>2011-07-12 21:17:41 +0000
committerH. Peter Anvin <hpa@linux.intel.com>2011-07-12 14:34:00 -0700
commit3040db92ee1b6c5b6b6d73f8cdcad54c0da11563 (patch)
treedfb59429b381c2f4165c5867fdbe5441153ed478 /arch/x86/kernel/apic
parent25970852280c9d5fb2de899769880d3e97332baa (diff)
x86, ioapic: Print IRTE when IR is enabled
When "apic=debug" is used as a boot parameter, Linux prints the IOAPIC routing entries in "dmesg". Below is output from IOAPIC whose apic_id is 8: # dmesg | grep "routing entry" IOAPIC[8]: Set routing entry (8-1 -> 0x31 -> IRQ 1 Mode:0 Active:0 Dest:0) IOAPIC[8]: Set routing entry (8-2 -> 0x30 -> IRQ 0 Mode:0 Active:0 Dest:0) IOAPIC[8]: Set routing entry (8-3 -> 0x33 -> IRQ 3 Mode:0 Active:0 Dest:0) ... Similarly, when IR (interrupt remapping) is enabled, and the IRTE (interrupt remapping table entry) is set up we should display it. After the fix: # dmesg | grep IRTE IOAPIC[8]: Set IRTE entry (P:1 FPD:0 Dst_Mode:0 Redir_hint:1 Trig_Mode:0 Dlvry_Mode:0 Avail:0 Vector:31 Dest:00000000 SID:00F1 SQ:0 SVT:1) IOAPIC[8]: Set IRTE entry (P:1 FPD:0 Dst_Mode:0 Redir_hint:1 Trig_Mode:0 Dlvry_Mode:0 Avail:0 Vector:30 Dest:00000000 SID:00F1 SQ:0 SVT:1) IOAPIC[8]: Set IRTE entry (P:1 FPD:0 Dst_Mode:0 Redir_hint:1 Trig_Mode:0 Dlvry_Mode:0 Avail:0 Vector:33 Dest:00000000 SID:00F1 SQ:0 SVT:1) ... The IRTE is defined in Sec 9.5 of the Intel VT-d Specification. Signed-off-by: Naga Chumbalkar <nagananda.chumbalkar@hp.com> Link: http://lkml.kernel.org/r/20110712211704.2939.71291.sendpatchset@nchumbalkar.americas.cpqcorp.net Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/kernel/apic')
-rw-r--r--arch/x86/kernel/apic/io_apic.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 5cba200609c..1ed5cbb9a14 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -1295,6 +1295,16 @@ static int setup_ioapic_entry(int apic_id, int irq,
* irq handler will do the explicit EOI to the io-apic.
*/
ir_entry->vector = pin;
+
+ apic_printk(APIC_VERBOSE, KERN_DEBUG "IOAPIC[%d]: "
+ "Set IRTE entry (P:%d FPD:%d Dst_Mode:%d "
+ "Redir_hint:%d Trig_Mode:%d Dlvry_Mode:%X "
+ "Avail:%X Vector:%02X Dest:%08X "
+ "SID:%04X SQ:%X SVT:%X)\n",
+ apic_id, irte.present, irte.fpd, irte.dst_mode,
+ irte.redir_hint, irte.trigger_mode, irte.dlvry_mode,
+ irte.avail, irte.vector, irte.dest_id,
+ irte.sid, irte.sq, irte.svt);
} else {
entry->delivery_mode = apic->irq_delivery_mode;
entry->dest_mode = apic->irq_dest_mode;