ACPI: create /sys/firmware/acpi/interrupts
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>hifive-unleashed-5.1
Len Brown
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What: /sys/firmware/acpi/interrupts/
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Date: February 2008
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Contact: Len Brown <lenb@kernel.org>
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Description:
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All ACPI interrupts are handled via a single IRQ,
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the System Control Interrupt (SCI), which appears
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as "acpi" in /proc/interrupts.
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However, one of the main functions of ACPI is to make
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the platform understand random hardware without
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special driver support. So while the SCI handles a few
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well known (fixed feature) interrupts sources, such
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as the power button, it can also handle a variable
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number of a "General Purpose Events" (GPE).
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A GPE vectors to a specified handler in AML, which
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can do a anything the BIOS writer wants from
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OS context. GPE 0x12, for example, would vector
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to a level or edge handler called _L12 or _E12.
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The handler may do its business and return.
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Or the handler may send send a Notify event
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to a Linux device driver registered on an ACPI device,
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such as a battery, or a processor.
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To figure out where all the SCI's are coming from,
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/sys/firmware/acpi/interrupts contains a file listing
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every possible source, and the count of how many
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times it has triggered.
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$ cd /sys/firmware/acpi/interrupts
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$ grep . *
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error:0
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ff_gbl_lock:0
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ff_pmtimer:0
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ff_pwr_btn:0
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ff_rt_clk:0
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ff_slp_btn:0
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gpe00:0
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gpe01:0
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gpe02:0
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gpe03:0
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gpe04:0
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gpe05:0
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gpe06:0
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gpe07:0
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gpe08:0
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gpe09:174
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gpe0A:0
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gpe0B:0
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gpe0C:0
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gpe0D:0
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gpe0E:0
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gpe0F:0
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gpe10:0
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gpe11:60
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gpe12:0
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gpe13:0
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gpe14:0
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gpe15:0
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gpe16:0
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gpe17:0
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gpe18:0
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gpe19:7
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gpe1A:0
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gpe1B:0
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gpe1C:0
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gpe1D:0
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gpe1E:0
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gpe1F:0
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gpe_all:241
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sci:241
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sci - The total number of times the ACPI SCI
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has claimed an interrupt.
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gpe_all - count of SCI caused by GPEs.
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gpeXX - count for individual GPE source
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ff_gbl_lock - Global Lock
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ff_pmtimer - PM Timer
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ff_pwr_btn - Power Button
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ff_rt_clk - Real Time Clock
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ff_slp_btn - Sleep Button
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error - an interrupt that can't be accounted for above.
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Root has permission to clear any of these counters. Eg.
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# echo 0 > gpe11
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All counters can be cleared by clearing the total "sci":
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# echo 0 > sci
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None of these counters has an effect on the function
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of the system, they are simply statistics.
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@ -259,7 +259,7 @@ u32 acpi_ev_fixed_event_detect(void)
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enable_bit_mask)) {
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/* Found an active (signalled) event */
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acpi_os_fixed_event_count(i);
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int_status |= acpi_ev_fixed_event_dispatch((u32) i);
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}
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}
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@ -618,7 +618,7 @@ acpi_ev_gpe_dispatch(struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)
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ACPI_FUNCTION_TRACE(ev_gpe_dispatch);
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acpi_gpe_count++;
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acpi_os_gpe_count(gpe_number);
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/*
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* If edge-triggered, clear the GPE status bit now. Note that
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@ -332,7 +332,15 @@ acpi_os_table_override(struct acpi_table_header * existing_table,
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static irqreturn_t acpi_irq(int irq, void *dev_id)
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{
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return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
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u32 handled;
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handled = (*acpi_irq_handler) (acpi_irq_context);
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if (handled) {
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acpi_irq_handled++;
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return IRQ_HANDLED;
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} else
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return IRQ_NONE;
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}
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acpi_status
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@ -341,6 +349,8 @@ acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
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{
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unsigned int irq;
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acpi_irq_stats_init();
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/*
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* Ignore the GSI from the core, and use the value in our copy of the
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* FADT. It may not be the same if an interrupt source override exists
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@ -40,6 +40,8 @@ ACPI_MODULE_NAME("system");
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#define ACPI_SYSTEM_CLASS "system"
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#define ACPI_SYSTEM_DEVICE_NAME "System"
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u32 acpi_irq_handled;
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/*
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* Make ACPICA version work as module param
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*/
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@ -166,6 +168,212 @@ static int acpi_system_sysfs_init(void)
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return 0;
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}
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/*
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* Detailed ACPI IRQ counters in /sys/firmware/acpi/interrupts/
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* See Documentation/ABI/testing/sysfs-firmware-acpi
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*/
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#define COUNT_GPE 0
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#define COUNT_SCI 1 /* acpi_irq_handled */
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#define COUNT_ERROR 2 /* other */
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#define NUM_COUNTERS_EXTRA 3
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static u32 *all_counters;
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static u32 num_gpes;
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static u32 num_counters;
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static struct attribute **all_attrs;
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static u32 acpi_gpe_count;
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static struct attribute_group interrupt_stats_attr_group = {
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.name = "interrupts",
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};
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static struct kobj_attribute *counter_attrs;
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static int count_num_gpes(void)
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{
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int count = 0;
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struct acpi_gpe_xrupt_info *gpe_xrupt_info;
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struct acpi_gpe_block_info *gpe_block;
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acpi_cpu_flags flags;
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flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
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gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
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while (gpe_xrupt_info) {
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gpe_block = gpe_xrupt_info->gpe_block_list_head;
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while (gpe_block) {
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count += gpe_block->register_count *
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ACPI_GPE_REGISTER_WIDTH;
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gpe_block = gpe_block->next;
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}
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gpe_xrupt_info = gpe_xrupt_info->next;
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}
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acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
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return count;
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}
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static void delete_gpe_attr_array(void)
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{
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u32 *tmp = all_counters;
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all_counters = NULL;
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kfree(tmp);
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if (counter_attrs) {
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int i;
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for (i = 0; i < num_gpes; i++)
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kfree(counter_attrs[i].attr.name);
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kfree(counter_attrs);
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}
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kfree(all_attrs);
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return;
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}
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void acpi_os_gpe_count(u32 gpe_number)
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{
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acpi_gpe_count++;
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if (!all_counters)
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return;
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if (gpe_number < num_gpes)
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all_counters[gpe_number]++;
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else
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all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR]++;
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return;
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}
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void acpi_os_fixed_event_count(u32 event_number)
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{
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if (!all_counters)
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return;
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if (event_number < ACPI_NUM_FIXED_EVENTS)
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all_counters[num_gpes + event_number]++;
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else
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all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR]++;
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return;
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}
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static ssize_t counter_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI] =
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acpi_irq_handled;
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all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE] =
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acpi_gpe_count;
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return sprintf(buf, "%d\n", all_counters[attr - counter_attrs]);
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}
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/*
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* counter_set() sets the specified counter.
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* setting the total "sci" file to any value clears all counters.
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*/
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static ssize_t counter_set(struct kobject *kobj,
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struct kobj_attribute *attr, const char *buf, size_t size)
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{
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int index = attr - counter_attrs;
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if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
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int i;
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for (i = 0; i < num_counters; ++i)
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all_counters[i] = 0;
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acpi_gpe_count = 0;
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acpi_irq_handled = 0;
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} else
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all_counters[index] = strtoul(buf, NULL, 0);
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return size;
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}
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void acpi_irq_stats_init(void)
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{
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int i;
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if (all_counters)
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return;
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num_gpes = count_num_gpes();
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num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
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all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
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GFP_KERNEL);
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if (all_attrs == NULL)
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return;
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all_counters = kzalloc(sizeof(u32) * (num_counters), GFP_KERNEL);
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if (all_counters == NULL)
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goto fail;
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counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
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GFP_KERNEL);
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if (counter_attrs == NULL)
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goto fail;
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for (i = 0; i < num_counters; ++i) {
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char buffer[10];
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char *name;
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if (i < num_gpes)
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sprintf(buffer, "gpe%02X", i);
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else if (i == num_gpes + ACPI_EVENT_PMTIMER)
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sprintf(buffer, "ff_pmtimer");
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else if (i == num_gpes + ACPI_EVENT_GLOBAL)
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sprintf(buffer, "ff_gbl_lock");
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else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
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sprintf(buffer, "ff_pwr_btn");
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else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
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sprintf(buffer, "ff_slp_btn");
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else if (i == num_gpes + ACPI_EVENT_RTC)
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sprintf(buffer, "ff_rt_clk");
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else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
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sprintf(buffer, "gpe_all");
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else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
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sprintf(buffer, "sci");
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else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
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sprintf(buffer, "error");
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else
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sprintf(buffer, "bug%02X", i);
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name = kzalloc(strlen(buffer) + 1, GFP_KERNEL);
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if (name == NULL)
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goto fail;
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strncpy(name, buffer, strlen(buffer) + 1);
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counter_attrs[i].attr.name = name;
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counter_attrs[i].attr.mode = 0644;
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counter_attrs[i].show = counter_show;
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counter_attrs[i].store = counter_set;
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all_attrs[i] = &counter_attrs[i].attr;
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}
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interrupt_stats_attr_group.attrs = all_attrs;
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sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group);
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return;
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fail:
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delete_gpe_attr_array();
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return;
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}
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static void __exit interrupt_stats_exit(void)
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{
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sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
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delete_gpe_attr_array();
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return;
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}
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/* --------------------------------------------------------------------------
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FS Interface (/proc)
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-------------------------------------------------------------------------- */
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@ -671,7 +671,6 @@ void acpi_ut_init_globals(void)
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/* GPE support */
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acpi_gpe_count = 0;
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acpi_gbl_gpe_xrupt_list_head = NULL;
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acpi_gbl_gpe_fadt_blocks[0] = NULL;
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acpi_gbl_gpe_fadt_blocks[1] = NULL;
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@ -735,4 +734,3 @@ void acpi_ut_init_globals(void)
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ACPI_EXPORT_SYMBOL(acpi_dbg_level)
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ACPI_EXPORT_SYMBOL(acpi_dbg_layer)
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ACPI_EXPORT_SYMBOL(acpi_gpe_count)
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@ -117,10 +117,6 @@ extern u32 acpi_dbg_layer;
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extern u32 acpi_gbl_nesting_level;
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/* Event counters */
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ACPI_EXTERN u32 acpi_gpe_count;
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/* Support for dynamic control method tracing mechanism */
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ACPI_EXTERN u32 acpi_gbl_original_dbg_level;
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@ -181,6 +181,9 @@ acpi_os_install_interrupt_handler(u32 gsi,
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acpi_status
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acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler service_routine);
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void acpi_os_gpe_count(u32 gpe_number);
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void acpi_os_fixed_event_count(u32 fixed_event_number);
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/*
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* Threads and Scheduling
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*/
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@ -115,7 +115,9 @@ int acpi_unmap_lsapic(int cpu);
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int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base);
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int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base);
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void acpi_irq_stats_init(void);
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extern u32 acpi_irq_handled;
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extern int acpi_mp_config;
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extern struct acpi_mcfg_allocation *pci_mmcfg_config;
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