NAME
irq - IRQ data
SYNOPSIS
irq [[[index ...] | -u ] | -d | -b | -a | -s [-c cpu]]
DESCRIPTION
This command collaborates the data in an irq_desc_t, along with its
associated hw_interrupt_type and irqaction structure data, into a
consolidated per-IRQ display. For kernel versions 2.6.37 and later
the display consists of the irq_desc/irq_data address, its irqaction
address(es), and the irqaction name strings. Alternatively, the
intel interrupt descriptor table, bottom half data, cpu affinity for
in-use irqs, or kernel irq stats may be displayed. If no index value
argument(s) nor any options are entered, the IRQ data for all IRQs will
be displayed.
index a valid IRQ index.
-u dump data for in-use IRQs only.
-d dump the intel interrupt descriptor table.
-b dump bottom half data.
-a dump cpu affinity for in-use IRQs.
-s dump the kernel irq stats; if no cpu specified with -c, the
irq stats of all cpus will be displayed.
-c cpu only usable with the -s option, dump the irq stats of the
specified cpu[s]; cpu can be specified as "1,3,5", "1-3",
"1,3,5-7,10", "all", or "a" (shortcut for "all").
EXAMPLES
Display the relevant data for IRQ 18 from a pre-2.6.37 kernel:
crash> irq 18
IRQ: 18
STATUS: 0
HANDLER: c02301e0 <ioapic_level_irq_type>
typename: c01f9e0c "IO-APIC-level"
startup: c0110234 <unmask_IO_APIC_irq>
shutdown: c01101cc <mask_IO_APIC_irq>
handle: c0110518 <do_level_ioapic_IRQ>
enable: c0110234 <unmask_IO_APIC_irq>
disable: c01101cc <mask_IO_APIC_irq>
ACTION: c009c6b0
handler: c01ce818 <do_aic7xxx_isr>
flags: 4000000 (SA_SHIRQ)
mask: 0
name: c0217780 "aic7xxx"
dev_id: c0090078
next: c009c770
ACTION: c009c770
handler: c01ce818 <do_aic7xxx_isr>
flags: 4000000 (SA_SHIRQ)
mask: 0
name: c0217780 "aic7xxx"
dev_id: c0091078
next: 0
DEPTH: 0
Display the relevant data for IRQ 21 from a 2.6.37 kernel:
crash> irq 21
IRQ IRQ_DESC/_DATA IRQACTION NAME
21 ffff88003787f780 ffff8800379a8b40 "ehci_hcd:usb2"
ffff8800379cbac0 "uhci_hcd:usb5"
ffff8800379cb140 "uhci_hcd:usb7"
Display the intel interrupt descriptor table entries:
crash> irq -d
[0] divide_error
[1] debug
[2] nmi
[3] int3
[4] overflow
[5] bounds
[6] invalid_op
[7] device_not_available
[8] double_fault
[9] coprocessor_segment_overrun
[10] invalid_TSS
[11] segment_not_present
[12] stack_segment
[13] general_protection
[14] page_fault
[15] spurious_interrupt_bug
[16] coprocessor_error
[17] alignment_check
[18] ignore_int
[19] ignore_int
[20] ignore_int
[21] ignore_int
...
[250] IRQ0xda_interrupt
[251] IRQ0xdb_interrupt
[252] IRQ0xdc_interrupt
[253] IRQ0xdd_interrupt
[254] IRQ0xde_interrupt
[255] spurious_interrupt
Display the bottom half data:
crash> irq -b
SOFTIRQ_VEC ACTION
[0] ffffffff81068f60 <tasklet_hi_action>
[1] ffffffff81071b80 <run_timer_softirq>
[2] ffffffff813e6f30 <net_tx_action>
[3] ffffffff813ee370 <net_rx_action>
[4] ffffffff81211a60 <blk_done_softirq>
[5] ffffffff812122f0 <blk_iopoll_softirq>
[6] ffffffff81069090 <tasklet_action>
[7] ffffffff81058830 <run_rebalance_domains>
[8] ffffffff81087f00 <run_hrtimer_softirq>
[9] ffffffff810ca7a0 <rcu_process_callbacks>
Display the cpu affinity for in-use IRQs:
crash> irq -a
IRQ NAME AFFINITY
0 timer 0-23
1 i8042 0-23
8 rtc0 0-23
9 acpi 0-23
16 ehci_hcd:usb2,uhci_hcd:usb3,uhci_hcd:usb6 0,6,18
17 uhci_hcd:usb4,uhci_hcd:usb7 0-23
18 ehci_hcd:usb1,uhci_hcd:usb5,uhci_hcd:usb8,ioc0 0,11,23
24 dmar0 0
35 pciehp 0-23
36 pciehp 0-23
37 pciehp 0-23
38 pciehp 0-23
39 megasas 0-5,12-17
40 lpfc:sp 0-5,12-17
41 lpfc:fp 0,6-11,18-23
42 lpfc:sp 0,6-11,18-23
43 lpfc:fp 0,6-11,18-23
...
80 ioat-msix 0-23
81 ioat-msix 0-23
82 ioat-msix 0-23
83 ioat-msix 0-23
84 ioat-msix 0-23
85 ioat-msix 0-23
86 ioat-msix 0-23
87 ioat-msix 0-23
88 eth4 0,17
Display the kernel irq stats:
crash>irq -c 0,2 -s
CPU0 CPU2
0: 2068161471 0 IR-IO-APIC-edge timer
1: 9 0 IR-IO-APIC-edge i8042
8: 1 0 IR-IO-APIC-edge rtc0
9: 0 0 IR-IO-APIC-fasteoi acpi
16: 36 0 IR-IO-APIC-fasteoi ehci_hcd:usb2
...
85: 3 0 IR-PCI-MSI-edge ioat-msix
86: 3 0 IR-PCI-MSI-edge ioat-msix
87: 3 0 IR-PCI-MSI-edge ioat-msix
88: 24 295 IR-PCI-MSI-edge eth4
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