- 根目录:
- drivers
- acpi
- sysfs.c
/*
* sysfs.c - ACPI sysfs interface to userspace.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/moduleparam.h>
#include <acpi/acpi_drivers.h>
#define _COMPONENT ACPI_SYSTEM_COMPONENT
ACPI_MODULE_NAME("sysfs");
#define PREFIX "ACPI: "
#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_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[6];
module_param_string(trace_method_name, trace_method_name, 6, 0644);
static unsigned int trace_debug_layer;
module_param(trace_debug_layer, uint, 0644);
static unsigned int trace_debug_level;
module_param(trace_debug_level, uint, 0644);
static int param_set_trace_state(const char *val, struct kernel_param *kp)
{
int result = 0;
if (!strncmp(val, "enable", strlen("enable") - 1)) {
result = acpi_debug_trace(trace_method_name, trace_debug_level,
trace_debug_layer, 0);
if (result)
result = -EBUSY;
goto exit;
}
if (!strncmp(val, "disable", strlen("disable") - 1)) {
int name = 0;
result = acpi_debug_trace((char *)&name, trace_debug_level,
trace_debug_layer, 0);
if (result)
result = -EBUSY;
goto exit;
}
if (!strncmp(val, "1", 1)) {
result = acpi_debug_trace(trace_method_name, trace_debug_level,
trace_debug_layer, 1);
if (result)
result = -EBUSY;
goto exit;
}
result = -EINVAL;
exit:
return result;
}
static int param_get_trace_state(char *buffer, struct kernel_param *kp)
{
if (!acpi_gbl_trace_method_name)
return sprintf(buffer, "disable");
else {
if (acpi_gbl_trace_flags & 1)
return sprintf(buffer, "1");
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,
bool, 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, 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/dynamic/
*/
static LIST_HEAD(acpi_table_attr_list);
static struct kobject *tables_kobj;
static struct kobject *dynamic_tables_kobj;
struct acpi_table_attr {
struct bin_attribute attr;
char name[8];
int instance;
struct list_head node;
};
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;
char name[ACPI_NAME_SIZE];
if (strncmp(table_attr->name, "NULL", 4))
memcpy(name, table_attr->name, ACPI_NAME_SIZE);
else
memcpy(name, "\0\0\0\0", 4);
status = acpi_get_table(name, table_attr->instance, &table_header);
if (ACPI_FAILURE(status))
return -ENODEV;
return memory_read_from_buffer(buf, count, &offset,
table_header, table_header->length);
}
static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
struct acpi_table_header *table_header)
{
struct acpi_table_header *header = NULL;
struct acpi_table_attr *attr = NULL;
sysfs_attr_init(&table_attr->attr.attr);
if (table_header->signature[0] != '\0')
memcpy(table_attr->name, table_header->signature,
ACPI_NAME_SIZE);
else
memcpy(table_attr->name, "NULL", 4);
list_for_each_entry(attr, &acpi_table_attr_list, node) {
if (!memcmp(table_attr->name, attr->name, ACPI_NAME_SIZE))
if (table_attr->instance < attr->instance)
table_attr->instance = attr->instance;
}
table_attr->instance++;
if (table_attr->instance > 1 || (table_attr->instance == 1 &&
!acpi_get_table
(table_header->signature, 2, &header)))
sprintf(table_attr->name + ACPI_NAME_SIZE, "%d",
table_attr->instance);
table_attr->attr.size = 0;
table_attr->attr.read = acpi_table_show;
table_attr->attr.attr.name = table_attr->name;
table_attr->attr.attr.mode = 0400;
return;
}
static acpi_status
acpi_sysfs_table_handler(u32 event, void *table, void *context)
{
struct acpi_table_attr *table_attr;
switch (event) {
case ACPI_TABLE_EVENT_LOAD:
table_attr =
kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
if (!table_attr)
return AE_NO_MEMORY;
acpi_table_attr_init(table_attr, table);
if (sysfs_create_bin_file(dynamic_tables_kobj,
&table_attr->attr)) {
kfree(table_attr);
return AE_ERROR;
} else
list_add_tail(&table_attr->node, &acpi_table_attr_list);
break;
case ACPI_TABLE_EVENT_UNLOAD:
/*
* 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 int acpi_tables_sysfs_init(void)
{
struct acpi_table_attr *table_attr;
struct acpi_table_header *table_header = NULL;
int table_index = 0;
int result;
tables_kobj = kobject_create_and_add("tables", acpi_kobj);
if (!tables_kobj)
goto err;
dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
if (!dynamic_tables_kobj)
goto err_dynamic_tables;
do {
result = acpi_get_table_by_index(table_index, &table_header);
if (!result) {
table_index++;
table_attr = NULL;
table_attr =
kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
if (!table_attr)
return -ENOMEM;
acpi_table_attr_init(table_attr, table_header);
result =
sysfs_create_bin_file(tables_kobj,
&table_attr->attr);
if (result) {
kfree(table_attr);
return result;
} else
list_add_tail(&table_attr->node,
&acpi_table_attr_list);
}
} while (!result);
kobject_uevent(tables_kobj, KOBJ_ADD);
kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
result = acpi_install_table_handler(acpi_sysfs_table_handler, NULL);
return result == AE_OK ? 0 : -EINVAL;
err_dynamic_tables:
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_gbl_event_handler(u32 event_type, acpi_handle device,
u32 event_number, void *context)
{
if (event_type == ACPI_EVENT_TYPE_GPE)
gpe_count(event_number);
if (event_type == ACPI_EVENT_TYPE_FIXED)
fixed_event_count(event_number);
}
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 = acpi_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, status);
} else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
result = acpi_get_event_status(index - num_gpes, status);
end:
return result;
}
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, "%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 (!(status & ACPI_EVENT_FLAG_HANDLE))
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");
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].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_HANDLE)) {
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_SET))
result = acpi_clear_gpe(handle, index);
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].count = strtoul(buf, NULL, 0);
if (ACPI_FAILURE(result))
result = -EINVAL;
end:
return result ? result : size;
}
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 = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
GFP_KERNEL);
if (all_attrs == NULL)
return;
all_counters = kzalloc(sizeof(struct event_counter) * (num_counters),
GFP_KERNEL);
if (all_counters == NULL)
goto fail;
status = acpi_install_global_event_handler(acpi_gbl_event_handler, NULL);
if (ACPI_FAILURE(status))
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[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 = kzalloc(strlen(buffer) + 1, GFP_KERNEL);
if (name == NULL)
goto fail;
strncpy(name, buffer, strlen(buffer) + 1);
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);
int __init acpi_sysfs_init(void)
{
int result;
result = acpi_tables_sysfs_init();
if (result)
return result;
result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr);
return result;
}