// SPDX-License-Identifier: GPL-2.0
/*
* sysfs.c - ACPI sysfs interface to userspace.
*/
#define pr_fmt(fmt) "ACPI: " fmt
#include <linux/acpi.h>
#include <linux/bitmap.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/kstrtox.h>
#include <linux/moduleparam.h>
#include "internal.h"
#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),
};
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 sysfs_emit(buffer, "%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");
if (!acpi_gbl_trace_method_name)
return sprintf(buffer, "enable\n");
if (acpi_gbl_trace_flags & ACPI_TRACE_ONESHOT)
return sprintf(buffer, "method-once\n");
else
return sprintf(buffer, "method\n");
}
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(*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 size;
data_attr = container_of(bin_attr, struct acpi_data_attr, attr);
size = data_attr->attr.size;
if (offset < 0)
return -EINVAL;
if (offset >= size)
return 0;
if (count > size - offset)
count = size - offset;
base = acpi_os_map_iomem(data_attr->addr, size);
if (!base)
return -ENOMEM;
memcpy_fromio(buf, base + offset, count);
acpi_os_unmap_iomem(base, size);
return count;
}
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 int acpi_ccel_data_init(void *th, struct acpi_data_attr *data_attr)
{
struct acpi_table_ccel *ccel = th;
if (ccel->header.length < sizeof(struct acpi_table_ccel) ||
!ccel->log_area_start_address || !ccel->log_area_minimum_length) {
kfree(data_attr);
return -EINVAL;
}
data_attr->addr = ccel->log_area_start_address;
data_attr->attr.size = ccel->log_area_minimum_length;
data_attr->attr.attr.name = "CCEL";
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 },
{ ACPI_SIG_CCEL, acpi_ccel_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);
}
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++;
}
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++;
}
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)) {
pr_warn("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)) {
pr_warn("Can not change Invalid GPE/Fixed Event status\n");
return -EINVAL;
}
if (index < num_gpes) {
if (!strcmp(buf, "disable\n") &&
(status & ACPI_EVENT_FLAG_ENABLED))
result = acpi_disable_gpe(handle, index);
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
* Note, the parameter can be a list (see bitmap_parselist() for the details).
* 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)
{
int ret;
u8 gpe;
ret = kstrtou8(val, 0, &gpe);
if (ret) {
ret = bitmap_parselist(val, acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX);
if (ret)
return ret;
} else
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(*all_attrs), GFP_KERNEL);
if (all_attrs == NULL)
return;
all_counters = kcalloc(num_counters, sizeof(*all_counters), 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(*counter_attrs), 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();
}
static void __exit interrupt_stats_exit(void)
{
sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
delete_gpe_attr_array();
}
static ssize_t pm_profile_show(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_RO(pm_profile);
static ssize_t 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 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_RW(enabled);
static struct attribute *hotplug_profile_attrs[] = {
&hotplug_enabled_attr.attr,
NULL
};
ATTRIBUTE_GROUPS(hotplug_profile);
static const struct kobj_type acpi_hotplug_profile_ktype = {
.sysfs_ops = &kobj_sysfs_ops,
.default_groups = hotplug_profile_groups,
};
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("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 = kstrtobool(buf, &val);
if (ret < 0)
return ret;
if (val) {
pr_err("Enabling force_remove is not supported anymore. Please report to [email protected] if you depend on this functionality\n");
return -EINVAL;
}
return size;
}
static const struct kobj_attribute force_remove_attr = __ATTR_RW(force_remove);
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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