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authorCraig Gallek <kraig@google.com>2016-09-13 12:14:51 -0400
committerThomas Gleixner <tglx@linutronix.de>2016-09-14 15:28:15 +0200
commitecb3f394c5dba897d215a5422f1b363e93e2ce4e (patch)
treee6807b6c7eddf7b7579e01fb0edcd0c0a87c1dca /Documentation/ABI/testing
parent00b992deaa08495ab958da5950c9ebbba27d0ddc (diff)
genirq: Expose interrupt information through sysfs
Information about interrupts is exposed via /proc/interrupts, but the format of that file has changed over kernel versions and differs across architectures. It also has varying column numbers depending on hardware. That all makes it hard for tools to parse. To solve this, expose the information through sysfs so each irq attribute is in a separate file in a consistent, machine parsable way. This feature is only available when both CONFIG_SPARSE_IRQ and CONFIG_SYSFS are enabled. Examples: /sys/kernel/irq/18/actions: i801_smbus,ehci_hcd:usb1,uhci_hcd:usb7 /sys/kernel/irq/18/chip_name: IR-IO-APIC /sys/kernel/irq/18/hwirq: 18 /sys/kernel/irq/18/name: fasteoi /sys/kernel/irq/18/per_cpu_count: 0,0 /sys/kernel/irq/18/type: level /sys/kernel/irq/25/actions: ahci0 /sys/kernel/irq/25/chip_name: IR-PCI-MSI /sys/kernel/irq/25/hwirq: 512000 /sys/kernel/irq/25/name: edge /sys/kernel/irq/25/per_cpu_count: 29036,0 /sys/kernel/irq/25/type: edge [ tglx: Moved kobject_del() under sparse_irq_lock, massaged code comments and changelog ] Signed-off-by: Craig Gallek <kraig@google.com> Cc: David Decotigny <decot@google.com> Link: http://lkml.kernel.org/r/1473783291-122873-1-git-send-email-kraigatgoog@gmail.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'Documentation/ABI/testing')
-rw-r--r--Documentation/ABI/testing/sysfs-kernel-irq53
1 files changed, 53 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-kernel-irq b/Documentation/ABI/testing/sysfs-kernel-irq
new file mode 100644
index 000000000000..eb074b100986
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-kernel-irq
@@ -0,0 +1,53 @@
+What: /sys/kernel/irq
+Date: September 2016
+KernelVersion: 4.9
+Contact: Craig Gallek <kraig@google.com>
+Description: Directory containing information about the system's IRQs.
+ Specifically, data from the associated struct irq_desc.
+ The information here is similar to that in /proc/interrupts
+ but in a more machine-friendly format. This directory contains
+ one subdirectory for each Linux IRQ number.
+
+What: /sys/kernel/irq/<irq>/actions
+Date: September 2016
+KernelVersion: 4.9
+Contact: Craig Gallek <kraig@google.com>
+Description: The IRQ action chain. A comma-separated list of zero or more
+ device names associated with this interrupt.
+
+What: /sys/kernel/irq/<irq>/chip_name
+Date: September 2016
+KernelVersion: 4.9
+Contact: Craig Gallek <kraig@google.com>
+Description: Human-readable chip name supplied by the associated device
+ driver.
+
+What: /sys/kernel/irq/<irq>/hwirq
+Date: September 2016
+KernelVersion: 4.9
+Contact: Craig Gallek <kraig@google.com>
+Description: When interrupt translation domains are used, this file contains
+ the underlying hardware IRQ number used for this Linux IRQ.
+
+What: /sys/kernel/irq/<irq>/name
+Date: September 2016
+KernelVersion: 4.9
+Contact: Craig Gallek <kraig@google.com>
+Description: Human-readable flow handler name as defined by the irq chip
+ driver.
+
+What: /sys/kernel/irq/<irq>/per_cpu_count
+Date: September 2016
+KernelVersion: 4.9
+Contact: Craig Gallek <kraig@google.com>
+Description: The number of times the interrupt has fired since boot. This
+ is a comma-separated list of counters; one per CPU in CPU id
+ order. NOTE: This file consistently shows counters for all
+ CPU ids. This differs from the behavior of /proc/interrupts
+ which only shows counters for online CPUs.
+
+What: /sys/kernel/irq/<irq>/type
+Date: September 2016
+KernelVersion: 4.9
+Contact: Craig Gallek <kraig@google.com>
+Description: The type of the interrupt. Either the string 'level' or 'edge'.