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

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

drivers/acpi/thermal.c

+2 −22
Original line number Diff line number Diff line
@@ -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;

}

drivers/sbus/char/bbc_envctrl.c

+2 −3
Original line number Diff line number Diff line
@@ -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");

}

drivers/sbus/char/envctrl.c

+2 −5
Original line number Diff line number Diff line
@@ -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 */

include/linux/reboot.h

+5 −0
Original line number Diff line number Diff line
@@ -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.

 */

kernel/sys.c

+58 −0
Original line number Diff line number Diff line
@@ -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);

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