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ACPI: Enhance /sys/firmware/interrupts to allow enable/disable/clear from user-space

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Allow users to enable/disable/clear a specific & valid GPE/Fixed Event
in user space.

This is useful for debugging, especially for some
interrupt storm issues.

All wakeup GPEs are disabled and they can not be enabled at runtime,
and we mark them as invalid.

All GPEs that don't have a _Lxx/_Exx method are marked as invalid.

All Fixed Events that don't have an event handler are marked as invalid
and they can't be enabled until an event handler is registered.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Ling Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
This commit is contained in:
Zhang Rui 2008-06-20 09:42:47 +08:00 committed by Andi Kleen
parent 9c9f6d052d
commit 71b58cbb0c
6 changed files with 258 additions and 64 deletions
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127
Documentation/ABI/testing/sysfs-firmware-acpi
View file

@ -29,46 +29,46 @@ Description:
$ 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.
@ -89,6 +89,13 @@ Description:
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
@ -97,3 +104,43 @@ Description:
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

18
drivers/acpi/events/evxfevnt.c
View file

@ -472,7 +472,6 @@ acpi_status acpi_clear_gpe(acpi_handle gpe_device, u32 gpe_number, u32 flags)
}
ACPI_EXPORT_SYMBOL(acpi_clear_gpe)
#ifdef ACPI_FUTURE_USAGE
/*******************************************************************************
*
* FUNCTION: acpi_get_event_status
@ -489,6 +488,7 @@ ACPI_EXPORT_SYMBOL(acpi_clear_gpe)
acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status)
{
acpi_status status = AE_OK;
u32 value;
ACPI_FUNCTION_TRACE(acpi_get_event_status);
@ -506,7 +506,20 @@ acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status)
status =
acpi_get_register(acpi_gbl_fixed_event_info[event].
status_register_id, event_status);
enable_register_id, &value);
if (ACPI_FAILURE(status))
return_ACPI_STATUS(status);
*event_status = value;
status =
acpi_get_register(acpi_gbl_fixed_event_info[event].
status_register_id, &value);
if (ACPI_FAILURE(status))
return_ACPI_STATUS(status);
if (value)
*event_status |= ACPI_EVENT_FLAG_SET;
return_ACPI_STATUS(status);
}
@ -566,7 +579,6 @@ acpi_get_gpe_status(acpi_handle gpe_device,
}
ACPI_EXPORT_SYMBOL(acpi_get_gpe_status)
#endif /* ACPI_FUTURE_USAGE */
/*******************************************************************************
*
* FUNCTION: acpi_install_gpe_block

2
drivers/acpi/hardware/hwgpe.c
View file

@ -186,7 +186,6 @@ acpi_status acpi_hw_clear_gpe(struct acpi_gpe_event_info * gpe_event_info)
*
******************************************************************************/
#ifdef ACPI_FUTURE_USAGE
acpi_status
acpi_hw_get_gpe_status(struct acpi_gpe_event_info * gpe_event_info,
acpi_event_status * event_status)
@ -246,7 +245,6 @@ acpi_hw_get_gpe_status(struct acpi_gpe_event_info * gpe_event_info,
unlock_and_exit:
return (status);
}
#endif /* ACPI_FUTURE_USAGE */
/******************************************************************************
*

169
drivers/acpi/system.c
View file

@ -167,7 +167,13 @@ static int acpi_system_sysfs_init(void)
#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;
@ -202,9 +208,44 @@ static int count_num_gpes(void)
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);
@ -230,9 +271,10 @@ void acpi_os_gpe_count(u32 gpe_number)
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;
}
@ -243,44 +285,144 @@ void acpi_os_fixed_event_count(u32 event_number)
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)
@ -298,7 +440,8 @@ 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;

2
include/acpi/achware.h
View file

@ -102,11 +102,9 @@ acpi_status
acpi_hw_clear_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
struct acpi_gpe_block_info *gpe_block);
#ifdef ACPI_FUTURE_USAGE
acpi_status
acpi_hw_get_gpe_status(struct acpi_gpe_event_info *gpe_event_info,
acpi_event_status * event_status);
#endif /* ACPI_FUTURE_USAGE */
acpi_status acpi_hw_disable_all_gpes(void);

4
include/acpi/acpixf.h
View file

@ -248,9 +248,7 @@ acpi_status acpi_disable_event(u32 event, u32 flags);
acpi_status acpi_clear_event(u32 event);
#ifdef ACPI_FUTURE_USAGE
acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status);
#endif /* ACPI_FUTURE_USAGE */
acpi_status acpi_set_gpe_type(acpi_handle gpe_device, u32 gpe_number, u8 type);
@ -260,12 +258,10 @@ acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number, u32 flags);
acpi_status acpi_clear_gpe(acpi_handle gpe_device, u32 gpe_number, u32 flags);
#ifdef ACPI_FUTURE_USAGE
acpi_status
acpi_get_gpe_status(acpi_handle gpe_device,
u32 gpe_number,
u32 flags, acpi_event_status * event_status);
#endif /* ACPI_FUTURE_USAGE */
acpi_status
acpi_install_gpe_block(acpi_handle gpe_device,