/* * debug.c - ACPI debug interface to userspace. */ #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <linux/init.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/moduleparam.h> #include <linux/debugfs.h> #include <linux/slab.h> #include <asm/uaccess.h> #include <acpi/acpi_drivers.h> #define _COMPONENT ACPI_SYSTEM_COMPONENT ACPI_MODULE_NAME("debug"); 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), }; /* -------------------------------------------------------------------------- FS Interface (/sys) -------------------------------------------------------------------------- */ static int param_get_debug_layer(char *buffer, 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, 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; } module_param_call(debug_layer, param_set_uint, param_get_debug_layer, &acpi_dbg_layer, 0644); module_param_call(debug_level, param_set_uint, param_get_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); /* -------------------------------------------------------------------------- DebugFS Interface -------------------------------------------------------------------------- */ static ssize_t cm_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos) { static char *buf; static int uncopied_bytes; struct acpi_table_header table; acpi_status status; if (!(*ppos)) { /* parse the table header to get the table length */ if (count <= sizeof(struct acpi_table_header)) return -EINVAL; if (copy_from_user(&table, user_buf, sizeof(struct acpi_table_header))) return -EFAULT; uncopied_bytes = table.length; buf = kzalloc(uncopied_bytes, GFP_KERNEL); if (!buf) return -ENOMEM; } if (uncopied_bytes < count) { kfree(buf); return -EINVAL; } if (copy_from_user(buf + (*ppos), user_buf, count)) { kfree(buf); return -EFAULT; } uncopied_bytes -= count; *ppos += count; if (!uncopied_bytes) { status = acpi_install_method(buf); kfree(buf); if (ACPI_FAILURE(status)) return -EINVAL; add_taint(TAINT_OVERRIDDEN_ACPI_TABLE); } return count; } static const struct file_operations cm_fops = { .write = cm_write, }; static int acpi_debugfs_init(void) { struct dentry *acpi_dir, *cm_dentry; acpi_dir = debugfs_create_dir("acpi", NULL); if (!acpi_dir) goto err; cm_dentry = debugfs_create_file("custom_method", S_IWUGO, acpi_dir, NULL, &cm_fops); if (!cm_dentry) goto err; return 0; err: if (acpi_dir) debugfs_remove(acpi_dir); return -EINVAL; } /* -------------------------------------------------------------------------- FS Interface (/proc) -------------------------------------------------------------------------- */ #ifdef CONFIG_ACPI_PROCFS #define ACPI_SYSTEM_FILE_DEBUG_LAYER "debug_layer" #define ACPI_SYSTEM_FILE_DEBUG_LEVEL "debug_level" static int acpi_system_debug_proc_show(struct seq_file *m, void *v) { unsigned int i; seq_printf(m, "%-25s\tHex SET\n", "Description"); switch ((unsigned long)m->private) { case 0: for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) { seq_printf(m, "%-25s\t0x%08lX [%c]\n", acpi_debug_layers[i].name, acpi_debug_layers[i].value, (acpi_dbg_layer & acpi_debug_layers[i]. value) ? '*' : ' '); } seq_printf(m, "%-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 ? ' ' : '-'); seq_printf(m, "--\ndebug_layer = 0x%08X (* = enabled, - = partial)\n", acpi_dbg_layer); break; case 1: for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) { seq_printf(m, "%-25s\t0x%08lX [%c]\n", acpi_debug_levels[i].name, acpi_debug_levels[i].value, (acpi_dbg_level & acpi_debug_levels[i]. value) ? '*' : ' '); } seq_printf(m, "--\ndebug_level = 0x%08X (* = enabled)\n", acpi_dbg_level); break; } return 0; } static int acpi_system_debug_proc_open(struct inode *inode, struct file *file) { return single_open(file, acpi_system_debug_proc_show, PDE(inode)->data); } static ssize_t acpi_system_debug_proc_write(struct file *file, const char __user * buffer, size_t count, loff_t *pos) { char debug_string[12] = { '\0' }; if (count > sizeof(debug_string) - 1) return -EINVAL; if (copy_from_user(debug_string, buffer, count)) return -EFAULT; debug_string[count] = '\0'; switch ((unsigned long)PDE(file->f_path.dentry->d_inode)->data) { case 0: acpi_dbg_layer = simple_strtoul(debug_string, NULL, 0); break; case 1: acpi_dbg_level = simple_strtoul(debug_string, NULL, 0); break; default: return -EINVAL; } return count; } static const struct file_operations acpi_system_debug_proc_fops = { .owner = THIS_MODULE, .open = acpi_system_debug_proc_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, .write = acpi_system_debug_proc_write, }; #endif int __init acpi_procfs_init(void) { #ifdef CONFIG_ACPI_PROCFS struct proc_dir_entry *entry; int error = 0; char *name; /* 'debug_layer' [R/W] */ name = ACPI_SYSTEM_FILE_DEBUG_LAYER; entry = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, acpi_root_dir, &acpi_system_debug_proc_fops, (void *)0); if (!entry) goto Error; /* 'debug_level' [R/W] */ name = ACPI_SYSTEM_FILE_DEBUG_LEVEL; entry = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, acpi_root_dir, &acpi_system_debug_proc_fops, (void *)1); if (!entry) goto Error; Done: return error; Error: remove_proc_entry(ACPI_SYSTEM_FILE_DEBUG_LEVEL, acpi_root_dir); remove_proc_entry(ACPI_SYSTEM_FILE_DEBUG_LAYER, acpi_root_dir); error = -ENODEV; goto Done; #else return 0; #endif } int __init acpi_debug_init(void) { acpi_debugfs_init(); acpi_procfs_init(); return 0; }