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- // 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\n", 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\n");
- else {
- if (acpi_gbl_trace_method_name) {
- if (acpi_gbl_trace_flags & ACPI_TRACE_ONESHOT)
- return sprintf(buffer, "method-once\n");
- else
- return sprintf(buffer, "method\n");
- } else
- return sprintf(buffer, "enable\n");
- }
- 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\n", 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 kobject *kobj, struct kobj_attribute *attr,
- char *buf)
- {
- return sprintf(buf, "%d\n", acpi_gbl_FADT.preferred_profile);
- }
- static const struct kobj_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;
- }
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