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reboot: move arch/x86 reboot= handling to generic kernel

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Merge together the unicore32, arm, and x86 reboot= command line
parameter handling.

Signed-off-by: Robin Holt <holt@sgi.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: Russ Anderson <rja@sgi.com>
Cc: Robin Holt <holt@sgi.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Robin Holt 2013-07-08 16:01:42 -07:00 committed by Linus Torvalds
parent 7b6d864b48
commit 1b3a5d02ee
8 changed files with 107 additions and 145 deletions
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14
Documentation/kernel-parameters.txt
View file

@ -2681,9 +2681,17 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
Run specified binary instead of /init from the ramdisk,
used for early userspace startup. See initrd.
reboot= [BUGS=X86-32,BUGS=ARM,BUGS=IA-64] Rebooting mode
Format: <reboot_mode>[,<reboot_mode2>[,...]]
See arch/*/kernel/reboot.c or arch/*/kernel/process.c
reboot= [KNL]
Format (x86 or x86_64):
[w[arm] | c[old] | h[ard] | s[oft] | g[pio]] \
[[,]s[mp]#### \
[[,]b[ios] | a[cpi] | k[bd] | t[riple] | e[fi] | p[ci]] \
[[,]f[orce]
Where reboot_mode is one of warm (soft) or cold (hard) or gpio,
reboot_type is one of bios, acpi, kbd, triple, efi, or pci,
reboot_force is either force or not specified,
reboot_cpu is s[mp]#### with #### being the processor
to be used for rebooting.
relax_domain_level=
[KNL, SMP] Set scheduler's default relax_domain_level.

10
arch/arm/kernel/process.c
View file

@ -176,16 +176,6 @@ void arch_cpu_idle(void)
default_idle();
}
enum reboot_mode reboot_mode = REBOOT_HARD;
static int __init reboot_setup(char *str)
{
if ('s' == str[0])
reboot_mode = REBOOT_SOFT;
return 1;
}
__setup("reboot=", reboot_setup);
/*
* Called by kexec, immediately prior to machine_kexec().
*

10
arch/unicore32/kernel/process.c
View file

@ -51,16 +51,6 @@ void arch_cpu_idle(void)
local_irq_enable();
}
static enum reboot_mode reboot_mode = REBOOT_HARD;
int __init reboot_setup(char *str)
{
if ('s' == str[0])
reboot_mode = REBOOT_SOFT;
return 1;
}
__setup("reboot=", reboot_setup);
void machine_halt(void)
{
gpio_set_value(GPO_SOFT_OFF, 0);

12
arch/x86/include/asm/emergency-restart.h
View file

@ -1,18 +1,6 @@
#ifndef _ASM_X86_EMERGENCY_RESTART_H
#define _ASM_X86_EMERGENCY_RESTART_H
enum reboot_type {
BOOT_TRIPLE = 't',
BOOT_KBD = 'k',
BOOT_BIOS = 'b',
BOOT_ACPI = 'a',
BOOT_EFI = 'e',
BOOT_CF9 = 'p',
BOOT_CF9_COND = 'q',
};
extern enum reboot_type reboot_type;
extern void machine_emergency_restart(void);
#endif /* _ASM_X86_EMERGENCY_RESTART_H */

2
arch/x86/kernel/apic/x2apic_uv_x.c
View file

@ -25,6 +25,7 @@
#include <linux/kdebug.h>
#include <linux/delay.h>
#include <linux/crash_dump.h>
#include <linux/reboot.h>
#include <asm/uv/uv_mmrs.h>
#include <asm/uv/uv_hub.h>
@ -36,7 +37,6 @@
#include <asm/ipi.h>
#include <asm/smp.h>
#include <asm/x86_init.h>
#include <asm/emergency-restart.h>
#include <asm/nmi.h>
/* BMC sets a bit this MMR non-zero before sending an NMI */

111
arch/x86/kernel/reboot.c
View file

@ -36,22 +36,6 @@ void (*pm_power_off)(void);
EXPORT_SYMBOL(pm_power_off);
static const struct desc_ptr no_idt = {};
static enum reboot_mode reboot_mode;
enum reboot_type reboot_type = BOOT_ACPI;
int reboot_force;
/*
* This variable is used privately to keep track of whether or not
* reboot_type is still set to its default value (i.e., reboot= hasn't
* been set on the command line). This is needed so that we can
* suppress DMI scanning for reboot quirks. Without it, it's
* impossible to override a faulty reboot quirk without recompiling.
*/
static int reboot_default = 1;
#ifdef CONFIG_SMP
static int reboot_cpu = -1;
#endif
/*
* This is set if we need to go through the 'emergency' path.
@ -63,79 +47,6 @@ static int reboot_emergency;
/* This is set by the PCI code if either type 1 or type 2 PCI is detected */
bool port_cf9_safe = false;
/*
* reboot=b[ios] | s[mp] | t[riple] | k[bd] | e[fi] [, [w]arm | [c]old] | p[ci]
* warm Don't set the cold reboot flag
* cold Set the cold reboot flag
* bios Reboot by jumping through the BIOS
* smp Reboot by executing reset on BSP or other CPU
* triple Force a triple fault (init)
* kbd Use the keyboard controller. cold reset (default)
* acpi Use the RESET_REG in the FADT
* efi Use efi reset_system runtime service
* pci Use the so-called "PCI reset register", CF9
* force Avoid anything that could hang.
*/
static int __init reboot_setup(char *str)
{
for (;;) {
/*
* Having anything passed on the command line via
* reboot= will cause us to disable DMI checking
* below.
*/
reboot_default = 0;
switch (*str) {
case 'w':
reboot_mode = REBOOT_WARM;
break;
case 'c':
reboot_mode = REBOOT_COLD;
break;
#ifdef CONFIG_SMP
case 's':
if (isdigit(*(str+1))) {
reboot_cpu = (int) (*(str+1) - '0');
if (isdigit(*(str+2)))
reboot_cpu = reboot_cpu*10 + (int)(*(str+2) - '0');
}
/*
* We will leave sorting out the final value
* when we are ready to reboot, since we might not
* have detected BSP APIC ID or smp_num_cpu
*/
break;
#endif /* CONFIG_SMP */
case 'b':
case 'a':
case 'k':
case 't':
case 'e':
case 'p':
reboot_type = *str;
break;
case 'f':
reboot_force = 1;
break;
}
str = strchr(str, ',');
if (str)
str++;
else
break;
}
return 1;
}
__setup("reboot=", reboot_setup);
/*
* Reboot options and system auto-detection code provided by
* Dell Inc. so their systems "just work". :-)
@ -616,26 +527,10 @@ void native_machine_shutdown(void)
{
/* Stop the cpus and apics */
#ifdef CONFIG_SMP
/* The boot cpu is always logical cpu 0 */
int reboot_cpu_id = 0;
/* See if there has been given a command line override */
if ((reboot_cpu != -1) && (reboot_cpu < nr_cpu_ids) &&
cpu_online(reboot_cpu))
reboot_cpu_id = reboot_cpu;
/* Make certain the cpu I'm about to reboot on is online */
if (!cpu_online(reboot_cpu_id))
reboot_cpu_id = smp_processor_id();
/* Make certain I only run on the appropriate processor */
set_cpus_allowed_ptr(current, cpumask_of(reboot_cpu_id));
/*
* O.K Now that I'm on the appropriate processor, stop all of the
* others. Also disable the local irq to not receive the per-cpu
* timer interrupt which may trigger scheduler's load balance.
* Stop all of the others. Also disable the local irq to
* not receive the per-cpu timer interrupt which may trigger
* scheduler's load balance.
*/
local_irq_disable();
stop_other_cpus();

17
include/linux/reboot.h
View file

@ -17,6 +17,23 @@ enum reboot_mode {
REBOOT_SOFT,
REBOOT_GPIO,
};
extern enum reboot_mode reboot_mode;
enum reboot_type {
BOOT_TRIPLE = 't',
BOOT_KBD = 'k',
BOOT_BIOS = 'b',
BOOT_ACPI = 'a',
BOOT_EFI = 'e',
BOOT_CF9 = 'p',
BOOT_CF9_COND = 'q',
};
extern enum reboot_type reboot_type;
extern int reboot_default;
extern int reboot_cpu;
extern int reboot_force;
extern int register_reboot_notifier(struct notifier_block *);
extern int unregister_reboot_notifier(struct notifier_block *);

76
kernel/reboot.c
View file

@ -6,6 +6,7 @@
#define pr_fmt(fmt) "reboot: " fmt
#include <linux/ctype.h>
#include <linux/export.h>
#include <linux/kexec.h>
#include <linux/kmod.h>
@ -24,6 +25,18 @@ int C_A_D = 1;
struct pid *cad_pid;
EXPORT_SYMBOL(cad_pid);
#if defined(CONFIG_ARM) || defined(CONFIG_UNICORE32)
#define DEFAULT_REBOOT_MODE = REBOOT_HARD
#else
#define DEFAULT_REBOOT_MODE
#endif
enum reboot_mode reboot_mode DEFAULT_REBOOT_MODE;
int reboot_default;
int reboot_cpu;
enum reboot_type reboot_type = BOOT_ACPI;
int reboot_force;
/*
* If set, this is used for preparing the system to power off.
*/
@ -87,7 +100,7 @@ EXPORT_SYMBOL(unregister_reboot_notifier);
static void migrate_to_reboot_cpu(void)
{
/* The boot cpu is always logical cpu 0 */
int cpu = 0;
int cpu = reboot_cpu;
cpu_hotplug_disable();
@ -343,3 +356,64 @@ int orderly_poweroff(bool force)
return 0;
}
EXPORT_SYMBOL_GPL(orderly_poweroff);
static int __init reboot_setup(char *str)
{
for (;;) {
/*
* Having anything passed on the command line via
* reboot= will cause us to disable DMI checking
* below.
*/
reboot_default = 0;
switch (*str) {
case 'w':
reboot_mode = REBOOT_WARM;
break;
case 'c':
reboot_mode = REBOOT_COLD;
break;
case 'h':
reboot_mode = REBOOT_HARD;
break;
case 's':
if (isdigit(*(str+1)))
reboot_cpu = simple_strtoul(str+1, NULL, 0);
else if (str[1] == 'm' && str[2] == 'p' &&
isdigit(*(str+3)))
reboot_cpu = simple_strtoul(str+3, NULL, 0);
else
reboot_mode = REBOOT_SOFT;
break;
case 'g':
reboot_mode = REBOOT_GPIO;
break;
case 'b':
case 'a':
case 'k':
case 't':
case 'e':
case 'p':
reboot_type = *str;
break;
case 'f':
reboot_force = 1;
break;
}
str = strchr(str, ',');
if (str)
str++;
else
break;
}
return 1;
}
__setup("reboot=", reboot_setup);