Commit 10a0a8d4 authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge Committed by Jeremy Fitzhardinge

Add common orderly_poweroff()

Various pieces of code around the kernel want to be able to trigger an
orderly poweroff.  This pulls them together into a single
implementation.

By default the poweroff command is /sbin/poweroff, but it can be set
via sysctl: kernel/poweroff_cmd.  This is split at whitespace, so it
can include command-line arguments.

This patch replaces four other instances of invoking either "poweroff"
or "shutdown -h now": two sbus drivers, and acpi thermal
management.

sparc64 has its own "powerd"; still need to determine whether it should
be replaced by orderly_poweroff().
Signed-off-by: default avatarJeremy Fitzhardinge <jeremy@xensource.com>
Acked-by: default avatarLen Brown <lenb@kernel.org>
Signed-off-by: default avatarChris Wright <chrisw@sous-sol.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: David S. Miller <davem@davemloft.net>
parent 0ab4dc92
......@@ -40,6 +40,7 @@
#include <linux/jiffies.h>
#include <linux/kmod.h>
#include <linux/seq_file.h>
#include <linux/reboot.h>
#include <asm/uaccess.h>
#include <acpi/acpi_bus.h>
......@@ -59,7 +60,6 @@
#define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
#define ACPI_THERMAL_NOTIFY_HOT 0xF1
#define ACPI_THERMAL_MODE_ACTIVE 0x00
#define ACPI_THERMAL_PATH_POWEROFF "/sbin/poweroff"
#define ACPI_THERMAL_MAX_ACTIVE 10
#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
......@@ -419,26 +419,6 @@ static int acpi_thermal_get_devices(struct acpi_thermal *tz)
return 0;
}
static int acpi_thermal_call_usermode(char *path)
{
char *argv[2] = { NULL, NULL };
char *envp[3] = { NULL, NULL, NULL };
if (!path)
return -EINVAL;
argv[0] = path;
/* minimal command environment */
envp[0] = "HOME=/";
envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
call_usermodehelper(argv[0], argv, envp, 0);
return 0;
}
static int acpi_thermal_critical(struct acpi_thermal *tz)
{
if (!tz || !tz->trips.critical.flags.valid)
......@@ -456,7 +436,7 @@ static int acpi_thermal_critical(struct acpi_thermal *tz)
acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
tz->trips.critical.flags.enabled);
acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);
orderly_poweroff(true);
return 0;
}
......
......@@ -7,6 +7,7 @@
#include <linux/kthread.h>
#include <linux/delay.h>
#include <linux/kmod.h>
#include <linux/reboot.h>
#include <asm/oplib.h>
#include <asm/ebus.h>
......@@ -170,8 +171,6 @@ static void get_current_temps(struct bbc_cpu_temperature *tp)
static void do_envctrl_shutdown(struct bbc_cpu_temperature *tp)
{
static int shutting_down = 0;
static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL };
char *argv[] = { "/sbin/shutdown", "-h", "now", NULL };
char *type = "???";
s8 val = -1;
......@@ -195,7 +194,7 @@ static void do_envctrl_shutdown(struct bbc_cpu_temperature *tp)
printk(KERN_CRIT "kenvctrld: Shutting down the system now.\n");
shutting_down = 1;
if (call_usermodehelper("/sbin/shutdown", argv, envp, 0) < 0)
if (orderly_poweroff(true) < 0)
printk(KERN_CRIT "envctrl: shutdown execution failed\n");
}
......
......@@ -26,6 +26,7 @@
#include <linux/ioport.h>
#include <linux/miscdevice.h>
#include <linux/kmod.h>
#include <linux/reboot.h>
#include <asm/ebus.h>
#include <asm/uaccess.h>
......@@ -966,10 +967,6 @@ static struct i2c_child_t *envctrl_get_i2c_child(unsigned char mon_type)
static void envctrl_do_shutdown(void)
{
static int inprog = 0;
static char *envp[] = {
"HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL };
char *argv[] = {
"/sbin/shutdown", "-h", "now", NULL };
int ret;
if (inprog != 0)
......@@ -977,7 +974,7 @@ static void envctrl_do_shutdown(void)
inprog = 1;
printk(KERN_CRIT "kenvctrld: WARNING: Shutting down the system now.\n");
ret = call_usermodehelper("/sbin/shutdown", argv, envp, 0);
ret = orderly_poweroff(true);
if (ret < 0) {
printk(KERN_CRIT "kenvctrld: WARNING: system shutdown failed!\n");
inprog = 0; /* unlikely to succeed, but we could try again */
......
......@@ -67,6 +67,11 @@ extern void kernel_power_off(void);
void ctrl_alt_del(void);
#define POWEROFF_CMD_PATH_LEN 256
extern char poweroff_cmd[POWEROFF_CMD_PATH_LEN];
extern int orderly_poweroff(bool force);
/*
* Emergency restart, callable from an interrupt handler.
*/
......
......@@ -2286,3 +2286,61 @@ asmlinkage long sys_getcpu(unsigned __user *cpup, unsigned __user *nodep,
}
return err ? -EFAULT : 0;
}
char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff";
static void argv_cleanup(char **argv, char **envp)
{
argv_free(argv);
}
/**
* orderly_poweroff - Trigger an orderly system poweroff
* @force: force poweroff if command execution fails
*
* This may be called from any context to trigger a system shutdown.
* If the orderly shutdown fails, it will force an immediate shutdown.
*/
int orderly_poweroff(bool force)
{
int argc;
char **argv = argv_split(GFP_ATOMIC, poweroff_cmd, &argc);
static char *envp[] = {
"HOME=/",
"PATH=/sbin:/bin:/usr/sbin:/usr/bin",
NULL
};
int ret = -ENOMEM;
struct subprocess_info *info;
if (argv == NULL) {
printk(KERN_WARNING "%s failed to allocate memory for \"%s\"\n",
__func__, poweroff_cmd);
goto out;
}
info = call_usermodehelper_setup(argv[0], argv, envp);
if (info == NULL) {
argv_free(argv);
goto out;
}
call_usermodehelper_setcleanup(info, argv_cleanup);
ret = call_usermodehelper_exec(info, -1);
out:
if (ret && force) {
printk(KERN_WARNING "Failed to start orderly shutdown: "
"forcing the issue\n");
/* I guess this should try to kick off some daemon to
sync and poweroff asap. Or not even bother syncing
if we're doing an emergency shutdown? */
emergency_sync();
kernel_power_off();
}
return ret;
}
EXPORT_SYMBOL_GPL(orderly_poweroff);
......@@ -46,6 +46,7 @@
#include <linux/syscalls.h>
#include <linux/nfs_fs.h>
#include <linux/acpi.h>
#include <linux/reboot.h>
#include <asm/uaccess.h>
#include <asm/processor.h>
......@@ -705,6 +706,15 @@ static ctl_table kern_table[] = {
.proc_handler = &proc_dointvec,
},
#endif
{
.ctl_name = CTL_UNNUMBERED,
.procname = "poweroff_cmd",
.data = &poweroff_cmd,
.maxlen = POWEROFF_CMD_PATH_LEN,
.mode = 0644,
.proc_handler = &proc_dostring,
.strategy = &sysctl_string,
},
{ .ctl_name = 0 }
};
......
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