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- 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.
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