path: root/drivers/acpi/sysfs.c

// 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, &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) ||