diff options
| -rw-r--r-- | drivers/acpi/Makefile | 1 | ||||
| -rw-r--r-- | drivers/acpi/bus.c | 1 | ||||
| -rw-r--r-- | drivers/acpi/debug.c | 75 | ||||
| -rw-r--r-- | drivers/acpi/debugfs.c | 85 | ||||
| -rw-r--r-- | drivers/acpi/internal.h | 6 |
5 files changed, 93 insertions, 75 deletions
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index 6ee33169e1dc..7891904419fc 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -39,6 +39,7 @@ acpi-y += pci_root.o pci_link.o pci_irq.o pci_bind.o acpi-y += power.o acpi-y += system.o event.o acpi-$(CONFIG_ACPI_DEBUG) += debug.o +acpi-$(CONFIG_DEBUG_FS) += debugfs.o acpi-$(CONFIG_ACPI_NUMA) += numa.o acpi-$(CONFIG_ACPI_PROCFS_POWER) += cm_sbs.o ifdef CONFIG_ACPI_VIDEO diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c index c1d23cd71652..7136f24e3002 100644 --- a/drivers/acpi/bus.c +++ b/drivers/acpi/bus.c @@ -1036,6 +1036,7 @@ static int __init acpi_init(void) acpi_power_init(); acpi_system_init(); acpi_debug_init(); + acpi_debugfs_init(); acpi_sleep_proc_init(); acpi_wakeup_device_init(); return result; diff --git a/drivers/acpi/debug.c b/drivers/acpi/debug.c index 146135e7a6a1..22476eab2b08 100644 --- a/drivers/acpi/debug.c +++ b/drivers/acpi/debug.c @@ -198,80 +198,6 @@ 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 @@ -400,7 +326,6 @@ int __init acpi_procfs_init(void) int __init acpi_debug_init(void) { - acpi_debugfs_init(); acpi_procfs_init(); return 0; } diff --git a/drivers/acpi/debugfs.c b/drivers/acpi/debugfs.c new file mode 100644 index 000000000000..abfcf9f6e766 --- /dev/null +++ b/drivers/acpi/debugfs.c @@ -0,0 +1,85 @@ +/* + * debugfs.c - ACPI debugfs interface to userspace. + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/uaccess.h> +#include <linux/debugfs.h> +#include <acpi/acpi_drivers.h> + +#define _COMPONENT ACPI_SYSTEM_COMPONENT +ACPI_MODULE_NAME("debugfs"); + +/* /sys/kernel/debug/acpi/custom_method */ + +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, +}; + +int __init 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; +} diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h index f8f190ec066e..0650e343867e 100644 --- a/drivers/acpi/internal.h +++ b/drivers/acpi/internal.h @@ -30,6 +30,12 @@ int acpi_debug_init(void); static inline int acpi_debug_init(void) { return 0; } #endif +#ifdef CONFIG_DEBUG_FS +int acpi_debugfs_init(void); +#else +static inline int acpi_debugfs_init(void) { return 0; } +#endif + /* -------------------------------------------------------------------------- Power Resource -------------------------------------------------------------------------- */ |