Loading Documentation/ABI/testing/sysfs-firmware-acpi 0 → 100644 +99 −0 Original line number Original line Diff line number Diff line 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. drivers/acpi/events/evevent.c +1 −1 Original line number Original line Diff line number Diff line Loading @@ -259,7 +259,7 @@ u32 acpi_ev_fixed_event_detect(void) enable_bit_mask)) { enable_bit_mask)) { /* Found an active (signalled) event */ /* Found an active (signalled) event */ acpi_os_fixed_event_count(i); int_status |= acpi_ev_fixed_event_dispatch((u32) i); int_status |= acpi_ev_fixed_event_dispatch((u32) i); } } } } Loading drivers/acpi/events/evgpe.c +1 −1 Original line number Original line Diff line number Diff line Loading @@ -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_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 * If edge-triggered, clear the GPE status bit now. Note that Loading drivers/acpi/osl.c +11 −1 Original line number Original line Diff line number Diff line Loading @@ -337,7 +337,15 @@ acpi_os_table_override(struct acpi_table_header * existing_table, static irqreturn_t acpi_irq(int irq, void *dev_id) 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 acpi_status Loading @@ -346,6 +354,8 @@ acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler, { { unsigned int irq; unsigned int irq; acpi_irq_stats_init(); /* /* * Ignore the GSI from the core, and use the value in our copy of the * 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 * FADT. It may not be the same if an interrupt source override exists Loading drivers/acpi/system.c +208 −0 Original line number Original line Diff line number Diff line Loading @@ -40,6 +40,8 @@ ACPI_MODULE_NAME("system"); #define ACPI_SYSTEM_CLASS "system" #define ACPI_SYSTEM_CLASS "system" #define ACPI_SYSTEM_DEVICE_NAME "System" #define ACPI_SYSTEM_DEVICE_NAME "System" u32 acpi_irq_handled; /* /* * Make ACPICA version work as module param * Make ACPICA version work as module param */ */ Loading Loading @@ -166,6 +168,212 @@ static int acpi_system_sysfs_init(void) return 0; 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) FS Interface (/proc) -------------------------------------------------------------------------- */ -------------------------------------------------------------------------- */ Loading Loading
Documentation/ABI/testing/sysfs-firmware-acpi 0 → 100644 +99 −0 Original line number Original line Diff line number Diff line 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.
drivers/acpi/events/evevent.c +1 −1 Original line number Original line Diff line number Diff line Loading @@ -259,7 +259,7 @@ u32 acpi_ev_fixed_event_detect(void) enable_bit_mask)) { enable_bit_mask)) { /* Found an active (signalled) event */ /* Found an active (signalled) event */ acpi_os_fixed_event_count(i); int_status |= acpi_ev_fixed_event_dispatch((u32) i); int_status |= acpi_ev_fixed_event_dispatch((u32) i); } } } } Loading
drivers/acpi/events/evgpe.c +1 −1 Original line number Original line Diff line number Diff line Loading @@ -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_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 * If edge-triggered, clear the GPE status bit now. Note that Loading
drivers/acpi/osl.c +11 −1 Original line number Original line Diff line number Diff line Loading @@ -337,7 +337,15 @@ acpi_os_table_override(struct acpi_table_header * existing_table, static irqreturn_t acpi_irq(int irq, void *dev_id) 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 acpi_status Loading @@ -346,6 +354,8 @@ acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler, { { unsigned int irq; unsigned int irq; acpi_irq_stats_init(); /* /* * Ignore the GSI from the core, and use the value in our copy of the * 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 * FADT. It may not be the same if an interrupt source override exists Loading
drivers/acpi/system.c +208 −0 Original line number Original line Diff line number Diff line Loading @@ -40,6 +40,8 @@ ACPI_MODULE_NAME("system"); #define ACPI_SYSTEM_CLASS "system" #define ACPI_SYSTEM_CLASS "system" #define ACPI_SYSTEM_DEVICE_NAME "System" #define ACPI_SYSTEM_DEVICE_NAME "System" u32 acpi_irq_handled; /* /* * Make ACPICA version work as module param * Make ACPICA version work as module param */ */ Loading Loading @@ -166,6 +168,212 @@ static int acpi_system_sysfs_init(void) return 0; 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) FS Interface (/proc) -------------------------------------------------------------------------- */ -------------------------------------------------------------------------- */ Loading
