$ 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
+ error: 0
+ ff_gbl_lock: 0 enable
+ ff_pmtimer: 0 invalid
+ ff_pwr_btn: 0 enable
+ ff_rt_clk: 2 disable
+ ff_slp_btn: 0 invalid
+ gpe00: 0 invalid
+ gpe01: 0 enable
+ gpe02: 108 enable
+ gpe03: 0 invalid
+ gpe04: 0 invalid
+ gpe05: 0 invalid
+ gpe06: 0 enable
+ gpe07: 0 enable
+ gpe08: 0 invalid
+ gpe09: 0 invalid
+ gpe0A: 0 invalid
+ gpe0B: 0 invalid
+ gpe0C: 0 invalid
+ gpe0D: 0 invalid
+ gpe0E: 0 invalid
+ gpe0F: 0 invalid
+ gpe10: 0 invalid
+ gpe11: 0 invalid
+ gpe12: 0 invalid
+ gpe13: 0 invalid
+ gpe14: 0 invalid
+ gpe15: 0 invalid
+ gpe16: 0 invalid
+ gpe17: 1084 enable
+ gpe18: 0 enable
+ gpe19: 0 invalid
+ gpe1A: 0 invalid
+ gpe1B: 0 invalid
+ gpe1C: 0 invalid
+ gpe1D: 0 invalid
+ gpe1E: 0 invalid
+ gpe1F: 0 invalid
+ gpe_all: 1192
+ sci: 1194
sci - The total number of times the ACPI SCI
has claimed an interrupt.
error - an interrupt that can't be accounted for above.
+ invalid: it's either a wakeup GPE or a GPE/Fixed Event that
+ doesn't have an event handler.
+
+ disable: the GPE/Fixed Event is valid but disabled.
+
+ enable: the GPE/Fixed Event is valid and enabled.
+
Root has permission to clear any of these counters. Eg.
# echo 0 > gpe11
None of these counters has an effect on the function
of the system, they are simply statistics.
+
+ Besides this, user can also write specific strings to these files
+ to enable/disable/clear ACPI interrupts in user space, which can be
+ used to debug some ACPI interrupt storm issues.
+
+ Note that only writting to VALID GPE/Fixed Event is allowed,
+ i.e. user can only change the status of runtime GPE and
+ Fixed Event with event handler installed.
+
+ Let's take power button fixed event for example, please kill acpid
+ and other user space applications so that the machine won't shutdown
+ when pressing the power button.
+ # cat ff_pwr_btn
+ 0
+ # press the power button for 3 times;
+ # cat ff_pwr_btn
+ 3
+ # echo disable > ff_pwr_btn
+ # cat ff_pwr_btn
+ disable
+ # press the power button for 3 times;
+ # cat ff_pwr_btn
+ disable
+ # echo enable > ff_pwr_btn
+ # cat ff_pwr_btn
+ 4
+ /*
+ * this is because the status bit is set even if the enable bit is cleared,
+ * and it triggers an ACPI fixed event when the enable bit is set again
+ */
+ # press the power button for 3 times;
+ # cat ff_pwr_btn
+ 7
+ # echo disable > ff_pwr_btn
+ # press the power button for 3 times;
+ # echo clear > ff_pwr_btn /* clear the status bit */
+ # echo disable > ff_pwr_btn
+ # cat ff_pwr_btn
+ 7
+
#define COUNT_ERROR 2 /* other */
#define NUM_COUNTERS_EXTRA 3
-static u32 *all_counters;
+#define ACPI_EVENT_VALID 0x01
+struct event_counter {
+ u32 count;
+ u32 flags;
+};
+
+static struct event_counter *all_counters;
static u32 num_gpes;
static u32 num_counters;
static struct attribute **all_attrs;
return count;
}
+static int get_gpe_device(int index, acpi_handle *handle)
+{
+ struct acpi_gpe_xrupt_info *gpe_xrupt_info;
+ struct acpi_gpe_block_info *gpe_block;
+ acpi_cpu_flags flags;
+ struct acpi_namespace_node *node;
+
+ 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;
+ node = gpe_block->node;
+ while (gpe_block) {
+ index -= gpe_block->register_count *
+ ACPI_GPE_REGISTER_WIDTH;
+ if (index < 0) {
+ acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
+ /* return NULL if it's FADT GPE */
+ if (node->type != ACPI_TYPE_DEVICE)
+ *handle = NULL;
+ else
+ *handle = node;
+ return 0;
+ }
+ node = gpe_block->node;
+ gpe_block = gpe_block->next;
+ }
+ gpe_xrupt_info = gpe_xrupt_info->next;
+ }
+ acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
+
+ return -ENODEV;
+}
+
static void delete_gpe_attr_array(void)
{
- u32 *tmp = all_counters;
+ struct event_counter *tmp = all_counters;
all_counters = NULL;
kfree(tmp);
return;
if (gpe_number < num_gpes)
- all_counters[gpe_number]++;
+ all_counters[gpe_number].count++;
else
- all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR]++;
+ all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR].
+ count++;
return;
}
return;
if (event_number < ACPI_NUM_FIXED_EVENTS)
- all_counters[num_gpes + event_number]++;
+ all_counters[num_gpes + event_number].count++;
else
- all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR]++;
+ all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR].
+ count++;
return;
}
+static int get_status(u32 index, acpi_event_status *status, acpi_handle *handle)
+{
+ int result = 0;
+
+ if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
+ goto end;
+
+ if (index < num_gpes) {
+ result = get_gpe_device(index, handle);
+ if (result) {
+ ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
+ "Invalid GPE 0x%x\n", index));
+ goto end;
+ }
+ result = acpi_get_gpe_status(*handle, index,
+ ACPI_NOT_ISR, status);
+ } else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
+ result = acpi_get_event_status(index - num_gpes, status);
+
+ /*
+ * sleep/power button GPE/Fixed Event is enabled after acpi_system_init,
+ * check the status at runtime and mark it as valid once it's enabled
+ */
+ if (!result && (*status & ACPI_EVENT_FLAG_ENABLED))
+ all_counters[index].flags |= ACPI_EVENT_VALID;
+end:
+ return result;
+}
+
static ssize_t counter_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
- all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI] =
+ int index = attr - counter_attrs;
+ int size;
+ acpi_handle handle;
+ acpi_event_status status;
+ int result = 0;
+
+ all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
acpi_irq_handled;
- all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE] =
+ all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
acpi_gpe_count;
- return sprintf(buf, "%d\n", all_counters[attr - counter_attrs]);
+ size = sprintf(buf, "%8d", all_counters[index].count);
+
+ /* "gpe_all" or "sci" */
+ if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
+ goto end;
+
+ result = get_status(index, &status, &handle);
+ if (result)
+ goto end;
+
+ if (!(all_counters[index].flags & ACPI_EVENT_VALID))
+ size += sprintf(buf + size, " invalid");
+ else if (status & ACPI_EVENT_FLAG_ENABLED)
+ size += sprintf(buf + size, " enable");
+ else
+ size += sprintf(buf + size, " disable");
+
+end:
+ size += sprintf(buf + size, "\n");
+ return result ? result : size;
}
/*
* counter_set() sets the specified counter.
* setting the total "sci" file to any value clears all counters.
+ * enable/disable/clear a gpe/fixed event in user space.
*/
static ssize_t counter_set(struct kobject *kobj,
struct kobj_attribute *attr, const char *buf, size_t size)
{
int index = attr - counter_attrs;
+ acpi_event_status status;
+ acpi_handle handle;
+ int result = 0;
if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
int i;
for (i = 0; i < num_counters; ++i)
- all_counters[i] = 0;
+ all_counters[i].count = 0;
acpi_gpe_count = 0;
acpi_irq_handled = 0;
+ goto end;
+ }
+ /* show the event status for both GPEs and Fixed Events */
+ result = get_status(index, &status, &handle);
+ if (result)
+ goto end;
+
+ if (!(all_counters[index].flags & ACPI_EVENT_VALID)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_WARN,
+ "Can not change Invalid GPE/Fixed Event status\n"));
+ return -EINVAL;
+ }
+
+ if (index < num_gpes) {
+ if (!strcmp(buf, "disable\n") &&
+ (status & ACPI_EVENT_FLAG_ENABLED))
+ result = acpi_disable_gpe(handle, index, ACPI_NOT_ISR);
+ else if (!strcmp(buf, "enable\n") &&
+ !(status & ACPI_EVENT_FLAG_ENABLED))
+ result = acpi_enable_gpe(handle, index, ACPI_NOT_ISR);
+ else if (!strcmp(buf, "clear\n") &&
+ (status & ACPI_EVENT_FLAG_SET))
+ result = acpi_clear_gpe(handle, index, ACPI_NOT_ISR);
+ else
+ all_counters[index].count = strtoul(buf, NULL, 0);
+ } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
+ int event = index - num_gpes;
+ if (!strcmp(buf, "disable\n") &&
+ (status & ACPI_EVENT_FLAG_ENABLED))
+ result = acpi_disable_event(event, ACPI_NOT_ISR);
+ else if (!strcmp(buf, "enable\n") &&
+ !(status & ACPI_EVENT_FLAG_ENABLED))
+ result = acpi_enable_event(event, ACPI_NOT_ISR);
+ else if (!strcmp(buf, "clear\n") &&
+ (status & ACPI_EVENT_FLAG_SET))
+ result = acpi_clear_event(event);
+ else
+ all_counters[index].count = strtoul(buf, NULL, 0);
} else
- all_counters[index] = strtoul(buf, NULL, 0);
+ all_counters[index].count = strtoul(buf, NULL, 0);
- return size;
+ if (ACPI_FAILURE(result))
+ result = -EINVAL;
+end:
+ return result ? result : size;
}
void acpi_irq_stats_init(void)
if (all_attrs == NULL)
return;
- all_counters = kzalloc(sizeof(u32) * (num_counters), GFP_KERNEL);
+ all_counters = kzalloc(sizeof(struct event_counter) * (num_counters),
+ GFP_KERNEL);
if (all_counters == NULL)
goto fail;
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff