x86, ioapic: Print IR_IO_APIC_route_entry when IR is enabled

When IR (interrupt remapping) is enabled print_IO_APIC() displays output according
to legacy RTE (redirection table entry) definitons:

 NR Dst Mask Trig IRR Pol Stat Dmod Deli Vect:
 00 00  1    0    0   0   0    0    0    00
 01 00  0    0    0   0   0    0    0    01
 02 00  0    0    0   0   0    0    0    02
 03 00  1    0    0   0   0    0    0    03
 04 00  1    0    0   0   0    0    0    04
 05 00  1    0    0   0   0    0    0    05
 06 00  1    0    0   0   0    0    0    06
...

The above output is as per Sec 3.2.4 of the IOAPIC datasheet:
82093AA I/O Advanced Programmable Interrupt Controller (IOAPIC):
http://download.intel.com/design/chipsets/datashts/29056601.pdf

Instead the output should display the fields as discussed in Sec 5.5.1
of the VT-d specification:

(Intel Virtualization Technology for Directed I/O:
http://download.intel.com/technology/computing/vptech/Intel(r)_VT_for_Direct_IO.pdf)

After the fix:
 NR Indx Fmt Mask Trig IRR Pol Stat Indx2 Zero Vect:
 00 0000 0   1    0    0   0   0    0     0    00
 01 000F 1   0    0    0   0   0    0     0    01
 02 0001 1   0    0    0   0   0    0     0    02
 03 0002 1   1    0    0   0   0    0     0    03
 04 0011 1   1    0    0   0   0    0     0    04
 05 0004 1   1    0    0   0   0    0     0    05
 06 0005 1   1    0    0   0   0    0     0    06
...
Signed-off-by: Naga Chumbalkar <nagananda.chumbalkar@hp.com>
Link: http://lkml.kernel.org/r/20110712211658.2939.93123.sendpatchset@nchumbalkar.americas.cpqcorp.netSigned-off-by: H. Peter Anvin <hpa@linux.intel.com>

arch/x86/kernel/apic/io_apic.c

@@ -1562,20 +1562,47 @@ __apicdebuginit(void) print_IO_APIC(void)
 
 	printk(KERN_DEBUG ".... IRQ redirection table:\n");
 
+	if (intr_remapping_enabled) {
+		printk(KERN_DEBUG " NR Indx Fmt Mask Trig IRR"
+			" Pol Stat Indx2 Zero Vect:\n");
+	} else {
 		printk(KERN_DEBUG " NR Dst Mask Trig IRR Pol"
 			" Stat Dmod Deli Vect:\n");
+	}
 
 	for (i = 0; i <= reg_01.bits.entries; i++) {
+		if (intr_remapping_enabled) {
 			struct IO_APIC_route_entry entry;
+			struct IR_IO_APIC_route_entry *ir_entry;
 
 			entry = ioapic_read_entry(apic, i);
+			ir_entry = (struct IR_IO_APIC_route_entry *) &entry;
+			printk(KERN_DEBUG " %02x %04X ",
+				i,
+				ir_entry->index
+			);
+			printk("%1d   %1d    %1d    %1d   %1d   "
+				"%1d    %1d     %X    %02X\n",
+				ir_entry->format,
+				ir_entry->mask,
+				ir_entry->trigger,
+				ir_entry->irr,
+				ir_entry->polarity,
+				ir_entry->delivery_status,
+				ir_entry->index2,
+				ir_entry->zero,
+				ir_entry->vector
+			);
+		} else {
+			struct IO_APIC_route_entry entry;
 
+			entry = ioapic_read_entry(apic, i);
 			printk(KERN_DEBUG " %02x %02X  ",
 				i,
 				entry.dest
 			);
-
-		printk("%1d    %1d    %1d   %1d   %1d    %1d    %1d    %02X\n",
+			printk("%1d    %1d    %1d   %1d   %1d    "
+				"%1d    %1d    %02X\n",
 				entry.mask,
 				entry.trigger,
 				entry.irr,
@@ -1587,6 +1614,8 @@ __apicdebuginit(void) print_IO_APIC(void)
 			);
 		}
 	}
+	}
+
 	printk(KERN_DEBUG "IRQ to pin mappings:\n");
 	for_each_active_irq(irq) {
 		struct irq_pin_list *entry;