// 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, &param_ops_debug_layer, &acpi_dbg_layer, 0644);
module_param_cb(debug_level, &param_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, &param_ops_trace_method, &trace_method_name, 0644);
module_param_cb(trace_debug_layer, &param_ops_trace_attrib, &acpi_gbl_trace_dbg_layer, 0644);
module_param_cb(trace_debug_level, &param_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,
                               const 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_obj(*table_attr);
                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,
                              const 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_obj(*data_attr);
                        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_obj(*table_attr);
                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 = sysfs_emit(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 += sysfs_emit_at(buf, size, "  EN");
        else
                size += sysfs_emit_at(buf, size, "    ");
        if (status & ACPI_EVENT_FLAG_STATUS_SET)
                size += sysfs_emit_at(buf, size, " STS");
        else
                size += sysfs_emit_at(buf, size, "    ");

        if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER))
                size += sysfs_emit_at(buf, size, " invalid     ");
        else if (status & ACPI_EVENT_FLAG_ENABLED)
                size += sysfs_emit_at(buf, size, " enabled     ");
        else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
                size += sysfs_emit_at(buf, size, " wake_enabled");
        else
                size += sysfs_emit_at(buf, size, " disabled    ");
        if (status & ACPI_EVENT_FLAG_MASKED)
                size += sysfs_emit_at(buf, size, " masked  ");
        else
                size += sysfs_emit_at(buf, size, " unmasked");

end:
        size += sysfs_emit_at(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 = kzalloc_objs(*all_attrs, num_counters + 1);
        if (all_attrs == NULL)
                return;

        all_counters = kzalloc_objs(*all_counters, num_counters);
        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 = kzalloc_objs(*counter_attrs, num_counters);
        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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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 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_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;
}