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Len Brown 2008-02-07 03:13:36 -05:00
commit e5e54bc86a
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99
Documentation/ABI/testing/sysfs-firmware-acpi Normal file
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@ -0,0 +1,99 @@
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.

2
drivers/acpi/events/evevent.c
View file

@ -259,7 +259,7 @@ u32 acpi_ev_fixed_event_detect(void)
enable_bit_mask)) {
/* Found an active (signalled) event */
acpi_os_fixed_event_count(i);
int_status |= acpi_ev_fixed_event_dispatch((u32) i);
}
}

2
drivers/acpi/events/evgpe.c
View file

@ -627,7 +627,7 @@ acpi_ev_gpe_dispatch(struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)
ACPI_FUNCTION_TRACE(ev_gpe_dispatch);
acpi_gpe_count++;
acpi_os_gpe_count(gpe_number);
/*
* If edge-triggered, clear the GPE status bit now. Note that

12
drivers/acpi/osl.c
View file

@ -337,7 +337,15 @@ acpi_os_table_override(struct acpi_table_header * existing_table,
static irqreturn_t acpi_irq(int irq, void *dev_id)
{
return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
u32 handled;
handled = (*acpi_irq_handler) (acpi_irq_context);
if (handled) {
acpi_irq_handled++;
return IRQ_HANDLED;
} else
return IRQ_NONE;
}
acpi_status
@ -346,6 +354,8 @@ acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
{
unsigned int irq;
acpi_irq_stats_init();
/*
* Ignore the GSI from the core, and use the value in our copy of the
* FADT. It may not be the same if an interrupt source override exists

208
drivers/acpi/system.c
View file

@ -40,6 +40,8 @@ ACPI_MODULE_NAME("system");
#define ACPI_SYSTEM_CLASS "system"
#define ACPI_SYSTEM_DEVICE_NAME "System"
u32 acpi_irq_handled;
/*
* Make ACPICA version work as module param
*/
@ -166,6 +168,212 @@ static int acpi_system_sysfs_init(void)
return 0;
}
/*
* Detailed ACPI IRQ counters in /sys/firmware/acpi/interrupts/
* See Documentation/ABI/testing/sysfs-firmware-acpi
*/
#define COUNT_GPE 0
#define COUNT_SCI 1 /* acpi_irq_handled */
#define COUNT_ERROR 2 /* other */
#define NUM_COUNTERS_EXTRA 3
static u32 *all_counters;
static u32 num_gpes;
static u32 num_counters;
static struct attribute **all_attrs;
static u32 acpi_gpe_count;
static struct attribute_group interrupt_stats_attr_group = {
.name = "interrupts",
};
static struct kobj_attribute *counter_attrs;
static int count_num_gpes(void)
{
int count = 0;
struct acpi_gpe_xrupt_info *gpe_xrupt_info;
struct acpi_gpe_block_info *gpe_block;
acpi_cpu_flags flags;
flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
while (gpe_xrupt_info) {
gpe_block = gpe_xrupt_info->gpe_block_list_head;
while (gpe_block) {
count += gpe_block->register_count *
ACPI_GPE_REGISTER_WIDTH;
gpe_block = gpe_block->next;
}
gpe_xrupt_info = gpe_xrupt_info->next;
}
acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
return count;
}
static void delete_gpe_attr_array(void)
{
u32 *tmp = all_counters;
all_counters = NULL;
kfree(tmp);
if (counter_attrs) {
int i;
for (i = 0; i < num_gpes; i++)
kfree(counter_attrs[i].attr.name);
kfree(counter_attrs);
}
kfree(all_attrs);
return;
}
void acpi_os_gpe_count(u32 gpe_number)
{
acpi_gpe_count++;
if (!all_counters)
return;
if (gpe_number < num_gpes)
all_counters[gpe_number]++;
else
all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR]++;
return;
}
void acpi_os_fixed_event_count(u32 event_number)
{
if (!all_counters)
return;
if (event_number < ACPI_NUM_FIXED_EVENTS)
all_counters[num_gpes + event_number]++;
else
all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR]++;
return;
}
static ssize_t counter_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI] =
acpi_irq_handled;
all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE] =
acpi_gpe_count;
return sprintf(buf, "%d\n", all_counters[attr - counter_attrs]);
}
/*
* counter_set() sets the specified counter.
* setting the total "sci" file to any value clears all counters.
*/
static ssize_t counter_set(struct kobject *kobj,
struct kobj_attribute *attr, const char *buf, size_t size)
{
int index = attr - counter_attrs;
if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
int i;
for (i = 0; i < num_counters; ++i)
all_counters[i] = 0;
acpi_gpe_count = 0;
acpi_irq_handled = 0;
} else
all_counters[index] = strtoul(buf, NULL, 0);
return size;
}
void acpi_irq_stats_init(void)
{
int i;
if (all_counters)
return;
num_gpes = count_num_gpes();
num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
GFP_KERNEL);
if (all_attrs == NULL)
return;
all_counters = kzalloc(sizeof(u32) * (num_counters), GFP_KERNEL);
if (all_counters == NULL)
goto fail;
counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
GFP_KERNEL);
if (counter_attrs == NULL)
goto fail;
for (i = 0; i < num_counters; ++i) {
char buffer[10];
char *name;
if (i < num_gpes)
sprintf(buffer, "gpe%02X", i);
else if (i == num_gpes + ACPI_EVENT_PMTIMER)
sprintf(buffer, "ff_pmtimer");
else if (i == num_gpes + ACPI_EVENT_GLOBAL)
sprintf(buffer, "ff_gbl_lock");
else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
sprintf(buffer, "ff_pwr_btn");
else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
sprintf(buffer, "ff_slp_btn");
else if (i == num_gpes + ACPI_EVENT_RTC)
sprintf(buffer, "ff_rt_clk");
else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
sprintf(buffer, "gpe_all");
else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
sprintf(buffer, "sci");
else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
sprintf(buffer, "error");
else
sprintf(buffer, "bug%02X", i);
name = kzalloc(strlen(buffer) + 1, GFP_KERNEL);
if (name == NULL)
goto fail;
strncpy(name, buffer, strlen(buffer) + 1);
counter_attrs[i].attr.name = name;
counter_attrs[i].attr.mode = 0644;
counter_attrs[i].show = counter_show;
counter_attrs[i].store = counter_set;
all_attrs[i] = &counter_attrs[i].attr;
}
interrupt_stats_attr_group.attrs = all_attrs;
sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group);
return;
fail:
delete_gpe_attr_array();
return;
}
static void __exit interrupt_stats_exit(void)
{
sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
delete_gpe_attr_array();
return;
}
/* --------------------------------------------------------------------------
FS Interface (/proc)
-------------------------------------------------------------------------- */

2
drivers/acpi/utilities/utglobal.c
View file

@ -671,7 +671,6 @@ void acpi_ut_init_globals(void)
/* GPE support */
acpi_gpe_count = 0;
acpi_gbl_gpe_xrupt_list_head = NULL;
acpi_gbl_gpe_fadt_blocks[0] = NULL;
acpi_gbl_gpe_fadt_blocks[1] = NULL;
@ -735,4 +734,3 @@ void acpi_ut_init_globals(void)
ACPI_EXPORT_SYMBOL(acpi_dbg_level)
ACPI_EXPORT_SYMBOL(acpi_dbg_layer)
ACPI_EXPORT_SYMBOL(acpi_gpe_count)

4
include/acpi/acglobal.h
View file

@ -117,10 +117,6 @@ extern u32 acpi_dbg_layer;
extern u32 acpi_gbl_nesting_level;
/* Event counters */
ACPI_EXTERN u32 acpi_gpe_count;
/* Support for dynamic control method tracing mechanism */
ACPI_EXTERN u32 acpi_gbl_original_dbg_level;

3
include/acpi/acpiosxf.h
View file

@ -181,6 +181,9 @@ acpi_os_install_interrupt_handler(u32 gsi,
acpi_status
acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler service_routine);
void acpi_os_gpe_count(u32 gpe_number);
void acpi_os_fixed_event_count(u32 fixed_event_number);
/*
* Threads and Scheduling
*/

2
include/linux/acpi.h
View file

@ -114,7 +114,9 @@ int acpi_unmap_lsapic(int cpu);
int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base);
int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base);
void acpi_irq_stats_init(void);
extern u32 acpi_irq_handled;
extern int acpi_mp_config;
extern struct acpi_mcfg_allocation *pci_mmcfg_config;