5229e87d59
See Documentation/ABI/testing/sysfs-firmware-acpi Based-on-original-patch-by: Luming Yu <luming.yu@intel.com> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Len Brown <len.brown@intel.com>
99 lines
2.2 KiB
Text
99 lines
2.2 KiB
Text
What: /sys/firmware/acpi/interrupts/
|
|
Date: February 2008
|
|
Contact: Len Brown <lenb@kernel.org>
|
|
Description:
|
|
All ACPI interrupts are handled via a single IRQ,
|
|
the System Control Interrupt (SCI), which appears
|
|
as "acpi" in /proc/interrupts.
|
|
|
|
However, one of the main functions of ACPI is to make
|
|
the platform understand random hardware without
|
|
special driver support. So while the SCI handles a few
|
|
well known (fixed feature) interrupts sources, such
|
|
as the power button, it can also handle a variable
|
|
number of a "General Purpose Events" (GPE).
|
|
|
|
A GPE vectors to a specified handler in AML, which
|
|
can do a anything the BIOS writer wants from
|
|
OS context. GPE 0x12, for example, would vector
|
|
to a level or edge handler called _L12 or _E12.
|
|
The handler may do its business and return.
|
|
Or the handler may send send a Notify event
|
|
to a Linux device driver registered on an ACPI device,
|
|
such as a battery, or a processor.
|
|
|
|
To figure out where all the SCI's are coming from,
|
|
/sys/firmware/acpi/interrupts contains a file listing
|
|
every possible source, and the count of how many
|
|
times it has triggered.
|
|
|
|
$ cd /sys/firmware/acpi/interrupts
|
|
$ grep . *
|
|
error:0
|
|
ff_gbl_lock:0
|
|
ff_pmtimer:0
|
|
ff_pwr_btn:0
|
|
ff_rt_clk:0
|
|
ff_slp_btn:0
|
|
gpe00:0
|
|
gpe01:0
|
|
gpe02:0
|
|
gpe03:0
|
|
gpe04:0
|
|
gpe05:0
|
|
gpe06:0
|
|
gpe07:0
|
|
gpe08:0
|
|
gpe09:174
|
|
gpe0A:0
|
|
gpe0B:0
|
|
gpe0C:0
|
|
gpe0D:0
|
|
gpe0E:0
|
|
gpe0F:0
|
|
gpe10:0
|
|
gpe11:60
|
|
gpe12:0
|
|
gpe13:0
|
|
gpe14:0
|
|
gpe15:0
|
|
gpe16:0
|
|
gpe17:0
|
|
gpe18:0
|
|
gpe19:7
|
|
gpe1A:0
|
|
gpe1B:0
|
|
gpe1C:0
|
|
gpe1D:0
|
|
gpe1E:0
|
|
gpe1F:0
|
|
gpe_all:241
|
|
sci:241
|
|
|
|
sci - The total number of times the ACPI SCI
|
|
has claimed an interrupt.
|
|
|
|
gpe_all - count of SCI caused by GPEs.
|
|
|
|
gpeXX - count for individual GPE source
|
|
|
|
ff_gbl_lock - Global Lock
|
|
|
|
ff_pmtimer - PM Timer
|
|
|
|
ff_pwr_btn - Power Button
|
|
|
|
ff_rt_clk - Real Time Clock
|
|
|
|
ff_slp_btn - Sleep Button
|
|
|
|
error - an interrupt that can't be accounted for above.
|
|
|
|
Root has permission to clear any of these counters. Eg.
|
|
# echo 0 > gpe11
|
|
|
|
All counters can be cleared by clearing the total "sci":
|
|
# echo 0 > sci
|
|
|
|
None of these counters has an effect on the function
|
|
of the system, they are simply statistics.
|