| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * sysfs.c - ACPI sysfs interface to userspace. |
| */ |
| |
| #define pr_fmt(fmt) "ACPI: " fmt |
| |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/moduleparam.h> |
| #include <linux/acpi.h> |
| |
| #include "internal.h" |
| |
| #define _COMPONENT ACPI_SYSTEM_COMPONENT |
| ACPI_MODULE_NAME("sysfs"); |
| |
| #ifdef CONFIG_ACPI_DEBUG |
| /* |
| * ACPI debug sysfs I/F, including: |
| * /sys/modules/acpi/parameters/debug_layer |
| * /sys/modules/acpi/parameters/debug_level |
| * /sys/modules/acpi/parameters/trace_method_name |
| * /sys/modules/acpi/parameters/trace_state |
| * /sys/modules/acpi/parameters/trace_debug_layer |
| * /sys/modules/acpi/parameters/trace_debug_level |
| */ |
| |
| struct acpi_dlayer { |
| const char *name; |
| unsigned long value; |
| }; |
| struct acpi_dlevel { |
| const char *name; |
| unsigned long value; |
| }; |
| #define ACPI_DEBUG_INIT(v) { .name = #v, .value = v } |
| |
| static const struct acpi_dlayer acpi_debug_layers[] = { |
| ACPI_DEBUG_INIT(ACPI_UTILITIES), |
| ACPI_DEBUG_INIT(ACPI_HARDWARE), |
| ACPI_DEBUG_INIT(ACPI_EVENTS), |
| ACPI_DEBUG_INIT(ACPI_TABLES), |
| ACPI_DEBUG_INIT(ACPI_NAMESPACE), |
| ACPI_DEBUG_INIT(ACPI_PARSER), |
| ACPI_DEBUG_INIT(ACPI_DISPATCHER), |
| ACPI_DEBUG_INIT(ACPI_EXECUTER), |
| ACPI_DEBUG_INIT(ACPI_RESOURCES), |
| ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER), |
| ACPI_DEBUG_INIT(ACPI_OS_SERVICES), |
| ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER), |
| ACPI_DEBUG_INIT(ACPI_COMPILER), |
| ACPI_DEBUG_INIT(ACPI_TOOLS), |
| |
| ACPI_DEBUG_INIT(ACPI_BUS_COMPONENT), |
| ACPI_DEBUG_INIT(ACPI_AC_COMPONENT), |
| ACPI_DEBUG_INIT(ACPI_BATTERY_COMPONENT), |
| ACPI_DEBUG_INIT(ACPI_BUTTON_COMPONENT), |
| ACPI_DEBUG_INIT(ACPI_SBS_COMPONENT), |
| ACPI_DEBUG_INIT(ACPI_FAN_COMPONENT), |
| ACPI_DEBUG_INIT(ACPI_PCI_COMPONENT), |
| ACPI_DEBUG_INIT(ACPI_POWER_COMPONENT), |
| ACPI_DEBUG_INIT(ACPI_CONTAINER_COMPONENT), |
| ACPI_DEBUG_INIT(ACPI_SYSTEM_COMPONENT), |
| ACPI_DEBUG_INIT(ACPI_THERMAL_COMPONENT), |
| ACPI_DEBUG_INIT(ACPI_MEMORY_DEVICE_COMPONENT), |
| ACPI_DEBUG_INIT(ACPI_VIDEO_COMPONENT), |
| ACPI_DEBUG_INIT(ACPI_PROCESSOR_COMPONENT), |
| }; |
| |
| static const struct acpi_dlevel acpi_debug_levels[] = { |
| ACPI_DEBUG_INIT(ACPI_LV_INIT), |
| ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT), |
| ACPI_DEBUG_INIT(ACPI_LV_INFO), |
| ACPI_DEBUG_INIT(ACPI_LV_REPAIR), |
| ACPI_DEBUG_INIT(ACPI_LV_TRACE_POINT), |
| |
| ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES), |
| ACPI_DEBUG_INIT(ACPI_LV_PARSE), |
| ACPI_DEBUG_INIT(ACPI_LV_LOAD), |
| ACPI_DEBUG_INIT(ACPI_LV_DISPATCH), |
| ACPI_DEBUG_INIT(ACPI_LV_EXEC), |
| ACPI_DEBUG_INIT(ACPI_LV_NAMES), |
| ACPI_DEBUG_INIT(ACPI_LV_OPREGION), |
| ACPI_DEBUG_INIT(ACPI_LV_BFIELD), |
| ACPI_DEBUG_INIT(ACPI_LV_TABLES), |
| ACPI_DEBUG_INIT(ACPI_LV_VALUES), |
| ACPI_DEBUG_INIT(ACPI_LV_OBJECTS), |
| ACPI_DEBUG_INIT(ACPI_LV_RESOURCES), |
| ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS), |
| ACPI_DEBUG_INIT(ACPI_LV_PACKAGE), |
| |
| ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS), |
| ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS), |
| ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS), |
| |
| ACPI_DEBUG_INIT(ACPI_LV_MUTEX), |
| ACPI_DEBUG_INIT(ACPI_LV_THREADS), |
| ACPI_DEBUG_INIT(ACPI_LV_IO), |
| ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS), |
| |
| ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE), |
| ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO), |
| ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES), |
| ACPI_DEBUG_INIT(ACPI_LV_EVENTS), |
| }; |
| |
| static int param_get_debug_layer(char *buffer, const struct kernel_param *kp) |
| { |
| int result = 0; |
| int i; |
| |
| result = sprintf(buffer, "%-25s\tHex SET\n", "Description"); |
| |
| for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) { |
| result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n", |
| acpi_debug_layers[i].name, |
| acpi_debug_layers[i].value, |
| (acpi_dbg_layer & acpi_debug_layers[i].value) |
| ? '*' : ' '); |
| } |
| result += |
| sprintf(buffer + result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS", |
| ACPI_ALL_DRIVERS, |
| (acpi_dbg_layer & ACPI_ALL_DRIVERS) == |
| ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer & ACPI_ALL_DRIVERS) |
| == 0 ? ' ' : '-'); |
| result += |
| sprintf(buffer + result, |
| "--\ndebug_layer = 0x%08X ( * = enabled)\n", |
| acpi_dbg_layer); |
| |
| return result; |
| } |
| |
| static int param_get_debug_level(char *buffer, const struct kernel_param *kp) |
| { |
| int result = 0; |
| int i; |
| |
| result = sprintf(buffer, "%-25s\tHex SET\n", "Description"); |
| |
| for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) { |
| result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n", |
| acpi_debug_levels[i].name, |
| acpi_debug_levels[i].value, |
| (acpi_dbg_level & acpi_debug_levels[i].value) |
| ? '*' : ' '); |
| } |
| result += |
| sprintf(buffer + result, "--\ndebug_level = 0x%08X (* = enabled)\n", |
| acpi_dbg_level); |
| |
| return result; |
| } |
| |
| static const struct kernel_param_ops param_ops_debug_layer = { |
| .set = param_set_uint, |
| .get = param_get_debug_layer, |
| }; |
| |
| static const struct kernel_param_ops param_ops_debug_level = { |
| .set = param_set_uint, |
| .get = param_get_debug_level, |
| }; |
| |
| module_param_cb(debug_layer, ¶m_ops_debug_layer, &acpi_dbg_layer, 0644); |
| module_param_cb(debug_level, ¶m_ops_debug_level, &acpi_dbg_level, 0644); |
| |
| static char trace_method_name[1024]; |
| |
| static int param_set_trace_method_name(const char *val, |
| const struct kernel_param *kp) |
| { |
| u32 saved_flags = 0; |
| bool is_abs_path = true; |
| |
| if (*val != '\\') |
| is_abs_path = false; |
| |
| if ((is_abs_path && strlen(val) > 1023) || |
| (!is_abs_path && strlen(val) > 1022)) { |
| pr_err("%s: string parameter too long\n", kp->name); |
| return -ENOSPC; |
| } |
| |
| /* |
| * It's not safe to update acpi_gbl_trace_method_name without |
| * having the tracer stopped, so we save the original tracer |
| * state and disable it. |
| */ |
| saved_flags = acpi_gbl_trace_flags; |
| (void)acpi_debug_trace(NULL, |
| acpi_gbl_trace_dbg_level, |
| acpi_gbl_trace_dbg_layer, |
| 0); |
| |
| /* This is a hack. We can't kmalloc in early boot. */ |
| if (is_abs_path) |
| strcpy(trace_method_name, val); |
| else { |
| trace_method_name[0] = '\\'; |
| strcpy(trace_method_name+1, val); |
| } |
| |
| /* Restore the original tracer state */ |
| (void)acpi_debug_trace(trace_method_name, |
| acpi_gbl_trace_dbg_level, |
| acpi_gbl_trace_dbg_layer, |
| saved_flags); |
| |
| return 0; |
| } |
| |
| static int param_get_trace_method_name(char *buffer, const struct kernel_param *kp) |
| { |
| return scnprintf(buffer, PAGE_SIZE, "%s", acpi_gbl_trace_method_name); |
| } |
| |
| static const struct kernel_param_ops param_ops_trace_method = { |
| .set = param_set_trace_method_name, |
| .get = param_get_trace_method_name, |
| }; |
| |
| static const struct kernel_param_ops param_ops_trace_attrib = { |
| .set = param_set_uint, |
| .get = param_get_uint, |
| }; |
| |
| module_param_cb(trace_method_name, ¶m_ops_trace_method, &trace_method_name, 0644); |
| module_param_cb(trace_debug_layer, ¶m_ops_trace_attrib, &acpi_gbl_trace_dbg_layer, 0644); |
| module_param_cb(trace_debug_level, ¶m_ops_trace_attrib, &acpi_gbl_trace_dbg_level, 0644); |
| |
| static int param_set_trace_state(const char *val, |
| const struct kernel_param *kp) |
| { |
| acpi_status status; |
| const char *method = trace_method_name; |
| u32 flags = 0; |
| |
| /* So "xxx-once" comparison should go prior than "xxx" comparison */ |
| #define acpi_compare_param(val, key) \ |
| strncmp((val), (key), sizeof(key) - 1) |
| |
| if (!acpi_compare_param(val, "enable")) { |
| method = NULL; |
| flags = ACPI_TRACE_ENABLED; |
| } else if (!acpi_compare_param(val, "disable")) |
| method = NULL; |
| else if (!acpi_compare_param(val, "method-once")) |
| flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT; |
| else if (!acpi_compare_param(val, "method")) |
| flags = ACPI_TRACE_ENABLED; |
| else if (!acpi_compare_param(val, "opcode-once")) |
| flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT | ACPI_TRACE_OPCODE; |
| else if (!acpi_compare_param(val, "opcode")) |
| flags = ACPI_TRACE_ENABLED | ACPI_TRACE_OPCODE; |
| else |
| return -EINVAL; |
| |
| status = acpi_debug_trace(method, |
| acpi_gbl_trace_dbg_level, |
| acpi_gbl_trace_dbg_layer, |
| flags); |
| if (ACPI_FAILURE(status)) |
| return -EBUSY; |
| |
| return 0; |
| } |
| |
| static int param_get_trace_state(char *buffer, const struct kernel_param *kp) |
| { |
| if (!(acpi_gbl_trace_flags & ACPI_TRACE_ENABLED)) |
| return sprintf(buffer, "disable"); |
| else { |
| if (acpi_gbl_trace_method_name) { |
| if (acpi_gbl_trace_flags & ACPI_TRACE_ONESHOT) |
| return sprintf(buffer, "method-once"); |
| else |
| return sprintf(buffer, "method"); |
| } else |
| return sprintf(buffer, "enable"); |
| } |
| return 0; |
| } |
| |
| module_param_call(trace_state, param_set_trace_state, param_get_trace_state, |
| NULL, 0644); |
| #endif /* CONFIG_ACPI_DEBUG */ |
| |
| |
| /* /sys/modules/acpi/parameters/aml_debug_output */ |
| |
| module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object, |
| byte, 0644); |
| MODULE_PARM_DESC(aml_debug_output, |
| "To enable/disable the ACPI Debug Object output."); |
| |
| /* /sys/module/acpi/parameters/acpica_version */ |
| static int param_get_acpica_version(char *buffer, |
| const struct kernel_param *kp) |
| { |
| int result; |
| |
| result = sprintf(buffer, "%x", ACPI_CA_VERSION); |
| |
| return result; |
| } |
| |
| module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444); |
| |
| /* |
| * ACPI table sysfs I/F: |
| * /sys/firmware/acpi/tables/ |
| * /sys/firmware/acpi/tables/data/ |
| * /sys/firmware/acpi/tables/dynamic/ |
| */ |
| |
| static LIST_HEAD(acpi_table_attr_list); |
| static struct kobject *tables_kobj; |
| static struct kobject *tables_data_kobj; |
| static struct kobject *dynamic_tables_kobj; |
| static struct kobject *hotplug_kobj; |
| |
| #define ACPI_MAX_TABLE_INSTANCES 999 |
| #define ACPI_INST_SIZE 4 /* including trailing 0 */ |
| |
| struct acpi_table_attr { |
| struct bin_attribute attr; |
| char name[ACPI_NAMESEG_SIZE]; |
| int instance; |
| char filename[ACPI_NAMESEG_SIZE+ACPI_INST_SIZE]; |
| struct list_head node; |
| }; |
| |
| struct acpi_data_attr { |
| struct bin_attribute attr; |
| u64 addr; |
| }; |
| |
| static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj, |
| struct bin_attribute *bin_attr, char *buf, |
| loff_t offset, size_t count) |
| { |
| struct acpi_table_attr *table_attr = |
| container_of(bin_attr, struct acpi_table_attr, attr); |
| struct acpi_table_header *table_header = NULL; |
| acpi_status status; |
| ssize_t rc; |
| |
| status = acpi_get_table(table_attr->name, table_attr->instance, |
| &table_header); |
| if (ACPI_FAILURE(status)) |
| return -ENODEV; |
| |
| rc = memory_read_from_buffer(buf, count, &offset, table_header, |
| table_header->length); |
| acpi_put_table(table_header); |
| return rc; |
| } |
| |
| static int acpi_table_attr_init(struct kobject *tables_obj, |
| struct acpi_table_attr *table_attr, |
| struct acpi_table_header *table_header) |
| { |
| struct acpi_table_header *header = NULL; |
| struct acpi_table_attr *attr = NULL; |
| char instance_str[ACPI_INST_SIZE]; |
| |
| sysfs_attr_init(&table_attr->attr.attr); |
| ACPI_COPY_NAMESEG(table_attr->name, table_header->signature); |
| |
| list_for_each_entry(attr, &acpi_table_attr_list, node) { |
| if (ACPI_COMPARE_NAMESEG(table_attr->name, attr->name)) |
| if (table_attr->instance < attr->instance) |
| table_attr->instance = attr->instance; |
| } |
| table_attr->instance++; |
| if (table_attr->instance > ACPI_MAX_TABLE_INSTANCES) { |
| pr_warn("%4.4s: too many table instances\n", |
| table_attr->name); |
| return -ERANGE; |
| } |
| |
| ACPI_COPY_NAMESEG(table_attr->filename, table_header->signature); |
| table_attr->filename[ACPI_NAMESEG_SIZE] = '\0'; |
| if (table_attr->instance > 1 || (table_attr->instance == 1 && |
| !acpi_get_table |
| (table_header->signature, 2, &header))) { |
| snprintf(instance_str, sizeof(instance_str), "%u", |
| table_attr->instance); |
| strcat(table_attr->filename, instance_str); |
| } |
| |
| table_attr->attr.size = table_header->length; |
| table_attr->attr.read = acpi_table_show; |
| table_attr->attr.attr.name = table_attr->filename; |
| table_attr->attr.attr.mode = 0400; |
| |
| return sysfs_create_bin_file(tables_obj, &table_attr->attr); |
| } |
| |
| acpi_status acpi_sysfs_table_handler(u32 event, void *table, void *context) |
| { |
| struct acpi_table_attr *table_attr; |
| |
| switch (event) { |
| case ACPI_TABLE_EVENT_INSTALL: |
| table_attr = |
| kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL); |
| if (!table_attr) |
| return AE_NO_MEMORY; |
| |
| if (acpi_table_attr_init(dynamic_tables_kobj, |
| table_attr, table)) { |
| kfree(table_attr); |
| return AE_ERROR; |
| } |
| list_add_tail(&table_attr->node, &acpi_table_attr_list); |
| break; |
| case ACPI_TABLE_EVENT_LOAD: |
| case ACPI_TABLE_EVENT_UNLOAD: |
| case ACPI_TABLE_EVENT_UNINSTALL: |
| /* |
| * we do not need to do anything right now |
| * because the table is not deleted from the |
| * global table list when unloading it. |
| */ |
| break; |
| default: |
| return AE_BAD_PARAMETER; |
| } |
| return AE_OK; |
| } |
| |
| static ssize_t acpi_data_show(struct file *filp, struct kobject *kobj, |
| struct bin_attribute *bin_attr, char *buf, |
| loff_t offset, size_t count) |
| { |
| struct acpi_data_attr *data_attr; |
| void __iomem *base; |
| ssize_t rc; |
| |
| data_attr = container_of(bin_attr, struct acpi_data_attr, attr); |
| |
| base = acpi_os_map_memory(data_attr->addr, data_attr->attr.size); |
| if (!base) |
| return -ENOMEM; |
| rc = memory_read_from_buffer(buf, count, &offset, base, |
| data_attr->attr.size); |
| acpi_os_unmap_memory(base, data_attr->attr.size); |
| |
| return rc; |
| } |
| |
| static int acpi_bert_data_init(void *th, struct acpi_data_attr *data_attr) |
| { |
| struct acpi_table_bert *bert = th; |
| |
| if (bert->header.length < sizeof(struct acpi_table_bert) || |
| bert->region_length < sizeof(struct acpi_hest_generic_status)) { |
| kfree(data_attr); |
| return -EINVAL; |
| } |
| data_attr->addr = bert->address; |
| data_attr->attr.size = bert->region_length; |
| data_attr->attr.attr.name = "BERT"; |
| |
| return sysfs_create_bin_file(tables_data_kobj, &data_attr->attr); |
| } |
| |
| static struct acpi_data_obj { |
| char *name; |
| int (*fn)(void *, struct acpi_data_attr *); |
| } acpi_data_objs[] = { |
| { ACPI_SIG_BERT, acpi_bert_data_init }, |
| }; |
| |
| #define NUM_ACPI_DATA_OBJS ARRAY_SIZE(acpi_data_objs) |
| |
| static int acpi_table_data_init(struct acpi_table_header *th) |
| { |
| struct acpi_data_attr *data_attr; |
| int i; |
| |
| for (i = 0; i < NUM_ACPI_DATA_OBJS; i++) { |
| if (ACPI_COMPARE_NAMESEG(th->signature, acpi_data_objs[i].name)) { |
| data_attr = kzalloc(sizeof(*data_attr), GFP_KERNEL); |
| if (!data_attr) |
| return -ENOMEM; |
| sysfs_attr_init(&data_attr->attr.attr); |
| data_attr->attr.read = acpi_data_show; |
| data_attr->attr.attr.mode = 0400; |
| return acpi_data_objs[i].fn(th, data_attr); |
| } |
| } |
| return 0; |
| } |
| |
| static int acpi_tables_sysfs_init(void) |
| { |
| struct acpi_table_attr *table_attr; |
| struct acpi_table_header *table_header = NULL; |
| int table_index; |
| acpi_status status; |
| int ret; |
| |
| tables_kobj = kobject_create_and_add("tables", acpi_kobj); |
| if (!tables_kobj) |
| goto err; |
| |
| tables_data_kobj = kobject_create_and_add("data", tables_kobj); |
| if (!tables_data_kobj) |
| goto err_tables_data; |
| |
| dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj); |
| if (!dynamic_tables_kobj) |
| goto err_dynamic_tables; |
| |
| for (table_index = 0;; table_index++) { |
| status = acpi_get_table_by_index(table_index, &table_header); |
| |
| if (status == AE_BAD_PARAMETER) |
| break; |
| |
| if (ACPI_FAILURE(status)) |
| continue; |
| |
| table_attr = kzalloc(sizeof(*table_attr), GFP_KERNEL); |
| if (!table_attr) |
| return -ENOMEM; |
| |
| ret = acpi_table_attr_init(tables_kobj, |
| table_attr, table_header); |
| if (ret) { |
| kfree(table_attr); |
| return ret; |
| } |
| list_add_tail(&table_attr->node, &acpi_table_attr_list); |
| acpi_table_data_init(table_header); |
| } |
| |
| kobject_uevent(tables_kobj, KOBJ_ADD); |
| kobject_uevent(tables_data_kobj, KOBJ_ADD); |
| kobject_uevent(dynamic_tables_kobj, KOBJ_ADD); |
| |
| return 0; |
| err_dynamic_tables: |
| kobject_put(tables_data_kobj); |
| err_tables_data: |
| kobject_put(tables_kobj); |
| err: |
| return -ENOMEM; |
| } |
| |
| /* |
| * Detailed ACPI IRQ counters: |
| * /sys/firmware/acpi/interrupts/ |
| */ |
| |
| u32 acpi_irq_handled; |
| u32 acpi_irq_not_handled; |
| |
| #define COUNT_GPE 0 |
| #define COUNT_SCI 1 /* acpi_irq_handled */ |
| #define COUNT_SCI_NOT 2 /* acpi_irq_not_handled */ |
| #define COUNT_ERROR 3 /* other */ |
| #define NUM_COUNTERS_EXTRA 4 |
| |
| 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; |
| static u32 acpi_gpe_count; |
| |
| static struct attribute_group interrupt_stats_attr_group = { |
| .name = "interrupts", |
| }; |
| |
| static struct kobj_attribute *counter_attrs; |
| |
| static void delete_gpe_attr_array(void) |
| { |
| struct event_counter *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; |
| } |
| |
| static void gpe_count(u32 gpe_number) |
| { |
| acpi_gpe_count++; |
| |
| if (!all_counters) |
| return; |
| |
| if (gpe_number < num_gpes) |
| all_counters[gpe_number].count++; |
| else |
| all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + |
| COUNT_ERROR].count++; |
| |
| return; |
| } |
| |
| static void fixed_event_count(u32 event_number) |
| { |
| if (!all_counters) |
| return; |
| |
| if (event_number < ACPI_NUM_FIXED_EVENTS) |
| all_counters[num_gpes + event_number].count++; |
| else |
| all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + |
| COUNT_ERROR].count++; |
| |
| return; |
| } |
| |
| static void acpi_global_event_handler(u32 event_type, acpi_handle device, |
| u32 event_number, void *context) |
| { |
| if (event_type == ACPI_EVENT_TYPE_GPE) { |
| gpe_count(event_number); |
| pr_debug("GPE event 0x%02x\n", event_number); |
| } else if (event_type == ACPI_EVENT_TYPE_FIXED) { |
| fixed_event_count(event_number); |
| pr_debug("Fixed event 0x%02x\n", event_number); |
| } else { |
| pr_debug("Other event 0x%02x\n", event_number); |
| } |
| } |
| |
| static int get_status(u32 index, acpi_event_status *ret, |
| acpi_handle *handle) |
| { |
| acpi_status status; |
| |
| if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS) |
| return -EINVAL; |
| |
| if (index < num_gpes) { |
| status = acpi_get_gpe_device(index, handle); |
| if (ACPI_FAILURE(status)) { |
| ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND, |
| "Invalid GPE 0x%x", index)); |
| return -ENXIO; |
| } |
| status = acpi_get_gpe_status(*handle, index, ret); |
| } else { |
| status = acpi_get_event_status(index - num_gpes, ret); |
| } |
| if (ACPI_FAILURE(status)) |
| return -EIO; |
| |
| return 0; |
| } |
| |
| static ssize_t counter_show(struct kobject *kobj, |
| struct kobj_attribute *attr, char *buf) |
| { |
| 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_SCI_NOT].count = |
| acpi_irq_not_handled; |
| all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count = |
| acpi_gpe_count; |
| size = sprintf(buf, "%8u", 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 (status & ACPI_EVENT_FLAG_ENABLE_SET) |
| size += sprintf(buf + size, " EN"); |
| else |
| size += sprintf(buf + size, " "); |
| if (status & ACPI_EVENT_FLAG_STATUS_SET) |
| size += sprintf(buf + size, " STS"); |
| else |
| size += sprintf(buf + size, " "); |
| |
| if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER)) |
| size += sprintf(buf + size, " invalid "); |
| else if (status & ACPI_EVENT_FLAG_ENABLED) |
| size += sprintf(buf + size, " enabled "); |
| else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED) |
| size += sprintf(buf + size, " wake_enabled"); |
| else |
| size += sprintf(buf + size, " disabled "); |
| if (status & ACPI_EVENT_FLAG_MASKED) |
| size += sprintf(buf + size, " masked "); |
| else |
| size += sprintf(buf + size, " unmasked"); |
| |
| 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; |
| unsigned long tmp; |
| |
| if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) { |
| int i; |
| for (i = 0; i < num_counters; ++i) |
| all_counters[i].count = 0; |
| acpi_gpe_count = 0; |
| acpi_irq_handled = 0; |
| acpi_irq_not_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 (!(status & ACPI_EVENT_FLAG_HAS_HANDLER)) { |
| printk(KERN_WARNING PREFIX |
| "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); |
| else if (!strcmp(buf, "enable\n") && |
| !(status & ACPI_EVENT_FLAG_ENABLED)) |
| result = acpi_enable_gpe(handle, index); |
| else if (!strcmp(buf, "clear\n") && |
| (status & ACPI_EVENT_FLAG_STATUS_SET)) |
| result = acpi_clear_gpe(handle, index); |
| else if (!strcmp(buf, "mask\n")) |
| result = acpi_mask_gpe(handle, index, TRUE); |
| else if (!strcmp(buf, "unmask\n")) |
| result = acpi_mask_gpe(handle, index, FALSE); |
| else if (!kstrtoul(buf, 0, &tmp)) |
| all_counters[index].count = tmp; |
| else |
| result = -EINVAL; |
| } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) { |
| int event = index - num_gpes; |
| if (!strcmp(buf, "disable\n") && |
| (status & ACPI_EVENT_FLAG_ENABLE_SET)) |
| result = acpi_disable_event(event, ACPI_NOT_ISR); |
| else if (!strcmp(buf, "enable\n") && |
| !(status & ACPI_EVENT_FLAG_ENABLE_SET)) |
| result = acpi_enable_event(event, ACPI_NOT_ISR); |
| else if (!strcmp(buf, "clear\n") && |
| (status & ACPI_EVENT_FLAG_STATUS_SET)) |
| result = acpi_clear_event(event); |
| else if (!kstrtoul(buf, 0, &tmp)) |
| all_counters[index].count = tmp; |
| else |
| result = -EINVAL; |
| } else |
| all_counters[index].count = strtoul(buf, NULL, 0); |
| |
| if (ACPI_FAILURE(result)) |
| result = -EINVAL; |
| end: |
| return result ? result : size; |
| } |
| |
| /* |
| * A Quirk Mechanism for GPE Flooding Prevention: |
| * |
| * Quirks may be needed to prevent GPE flooding on a specific GPE. The |
| * flooding typically cannot be detected and automatically prevented by |
| * ACPI_GPE_DISPATCH_NONE check because there is a _Lxx/_Exx prepared in |
| * the AML tables. This normally indicates a feature gap in Linux, thus |
| * instead of providing endless quirk tables, we provide a boot parameter |
| * for those who want this quirk. For example, if the users want to prevent |
| * the GPE flooding for GPE 00, they need to specify the following boot |
| * parameter: |
| * acpi_mask_gpe=0x00 |
| * The masking status can be modified by the following runtime controlling |
| * interface: |
| * echo unmask > /sys/firmware/acpi/interrupts/gpe00 |
| */ |
| #define ACPI_MASKABLE_GPE_MAX 0x100 |
| static DECLARE_BITMAP(acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) __initdata; |
| |
| static int __init acpi_gpe_set_masked_gpes(char *val) |
| { |
| u8 gpe; |
| |
| if (kstrtou8(val, 0, &gpe)) |
| return -EINVAL; |
| set_bit(gpe, acpi_masked_gpes_map); |
| |
| return 1; |
| } |
| __setup("acpi_mask_gpe=", acpi_gpe_set_masked_gpes); |
| |
| void __init acpi_gpe_apply_masked_gpes(void) |
| { |
| acpi_handle handle; |
| acpi_status status; |
| u16 gpe; |
| |
| for_each_set_bit(gpe, acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) { |
| status = acpi_get_gpe_device(gpe, &handle); |
| if (ACPI_SUCCESS(status)) { |
| pr_info("Masking GPE 0x%x.\n", gpe); |
| (void)acpi_mask_gpe(handle, gpe, TRUE); |
| } |
| } |
| } |
| |
| void acpi_irq_stats_init(void) |
| { |
| acpi_status status; |
| int i; |
| |
| if (all_counters) |
| return; |
| |
| num_gpes = acpi_current_gpe_count; |
| num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA; |
| |
| all_attrs = kcalloc(num_counters + 1, sizeof(struct attribute *), |
| GFP_KERNEL); |
| if (all_attrs == NULL) |
| return; |
| |
| all_counters = kcalloc(num_counters, sizeof(struct event_counter), |
| GFP_KERNEL); |
| if (all_counters == NULL) |
| goto fail; |
| |
| status = acpi_install_global_event_handler(acpi_global_event_handler, NULL); |
| if (ACPI_FAILURE(status)) |
| goto fail; |
| |
| counter_attrs = kcalloc(num_counters, sizeof(struct kobj_attribute), |
| GFP_KERNEL); |
| if (counter_attrs == NULL) |
| goto fail; |
| |
| for (i = 0; i < num_counters; ++i) { |
| char buffer[12]; |
| 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_SCI_NOT) |
| sprintf(buffer, "sci_not"); |
| else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR) |
| sprintf(buffer, "error"); |
| else |
| sprintf(buffer, "bug%02X", i); |
| |
| name = kstrdup(buffer, GFP_KERNEL); |
| if (name == NULL) |
| goto fail; |
| |
| sysfs_attr_init(&counter_attrs[i].attr); |
| 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; |
| if (!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; |
| } |
| |
| static ssize_t |
| acpi_show_profile(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| return sprintf(buf, "%d\n", acpi_gbl_FADT.preferred_profile); |
| } |
| |
| static const struct device_attribute pm_profile_attr = |
| __ATTR(pm_profile, S_IRUGO, acpi_show_profile, NULL); |
| |
| static ssize_t hotplug_enabled_show(struct kobject *kobj, |
| struct kobj_attribute *attr, char *buf) |
| { |
| struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj); |
| |
| return sprintf(buf, "%d\n", hotplug->enabled); |
| } |
| |
| static ssize_t hotplug_enabled_store(struct kobject *kobj, |
| struct kobj_attribute *attr, |
| const char *buf, size_t size) |
| { |
| struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj); |
| unsigned int val; |
| |
| if (kstrtouint(buf, 10, &val) || val > 1) |
| return -EINVAL; |
| |
| acpi_scan_hotplug_enabled(hotplug, val); |
| return size; |
| } |
| |
| static struct kobj_attribute hotplug_enabled_attr = |
| __ATTR(enabled, S_IRUGO | S_IWUSR, hotplug_enabled_show, |
| hotplug_enabled_store); |
| |
| static struct attribute *hotplug_profile_attrs[] = { |
| &hotplug_enabled_attr.attr, |
| NULL |
| }; |
| |
| static struct kobj_type acpi_hotplug_profile_ktype = { |
| .sysfs_ops = &kobj_sysfs_ops, |
| .default_attrs = hotplug_profile_attrs, |
| }; |
| |
| void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug, |
| const char *name) |
| { |
| int error; |
| |
| if (!hotplug_kobj) |
| goto err_out; |
| |
| error = kobject_init_and_add(&hotplug->kobj, |
| &acpi_hotplug_profile_ktype, hotplug_kobj, "%s", name); |
| if (error) { |
| kobject_put(&hotplug->kobj); |
| goto err_out; |
| } |
| |
| kobject_uevent(&hotplug->kobj, KOBJ_ADD); |
| return; |
| |
| err_out: |
| pr_err(PREFIX "Unable to add hotplug profile '%s'\n", name); |
| } |
| |
| static ssize_t force_remove_show(struct kobject *kobj, |
| struct kobj_attribute *attr, char *buf) |
| { |
| return sprintf(buf, "%d\n", 0); |
| } |
| |
| static ssize_t force_remove_store(struct kobject *kobj, |
| struct kobj_attribute *attr, |
| const char *buf, size_t size) |
| { |
| bool val; |
| int ret; |
| |
| ret = strtobool(buf, &val); |
| if (ret < 0) |
| return ret; |
| |
| if (val) { |
| pr_err("Enabling force_remove is not supported anymore. Please report to linux-acpi@vger.kernel.org if you depend on this functionality\n"); |
| return -EINVAL; |
| } |
| return size; |
| } |
| |
| static const struct kobj_attribute force_remove_attr = |
| __ATTR(force_remove, S_IRUGO | S_IWUSR, force_remove_show, |
| force_remove_store); |
| |
| int __init acpi_sysfs_init(void) |
| { |
| int result; |
| |
| result = acpi_tables_sysfs_init(); |
| if (result) |
| return result; |
| |
| hotplug_kobj = kobject_create_and_add("hotplug", acpi_kobj); |
| if (!hotplug_kobj) |
| return -ENOMEM; |
| |
| result = sysfs_create_file(hotplug_kobj, &force_remove_attr.attr); |
| if (result) |
| return result; |
| |
| result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr); |
| return result; |
| } |