Introduce CONFIG_SUSPEND for suspend-to-Ram and standby
Introduce CONFIG_SUSPEND representing the ability to enter system sleep
states, such as the ACPI S3 state, and allow the user to choose SUSPEND
and HIBERNATION independently of each other.
Make HOTPLUG_CPU be selected automatically if SUSPEND or HIBERNATION has
been chosen and the kernel is intended for SMP systems.
Also, introduce CONFIG_PM_SLEEP which is automatically selected if
CONFIG_SUSPEND or CONFIG_HIBERNATION is set and use it to select the
code needed for both suspend and hibernation.
The top-level power management headers and the ACPI code related to
suspend and hibernation are modified to use the new definitions (the
changes in drivers/acpi/sleep/main.c are, mostly, moving code to reduce
the number of ifdefs).
There are many other files in which CONFIG_PM can be replaced with
CONFIG_PM_SLEEP or even with CONFIG_SUSPEND, but they can be updated in
the future.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index c2582a4..412859f 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -46,7 +46,7 @@
config DISABLE_CONSOLE_SUSPEND
bool "Keep console(s) enabled during suspend/resume (DANGEROUS)"
- depends on PM_DEBUG
+ depends on PM_DEBUG && PM_SLEEP
default n
---help---
This option turns off the console suspend mechanism that prevents
@@ -57,7 +57,7 @@
config PM_TRACE
bool "Suspend/resume event tracing"
- depends on PM_DEBUG && X86 && EXPERIMENTAL
+ depends on PM_DEBUG && X86 && PM_SLEEP && EXPERIMENTAL
default n
---help---
This enables some cheesy code to save the last PM event point in the
@@ -72,9 +72,37 @@
CAUTION: this option will cause your machine's real-time clock to be
set to an invalid time after a resume.
+config SUSPEND_SMP_POSSIBLE
+ bool
+ depends on (X86 && !X86_VOYAGER) || (PPC64 && (PPC_PSERIES || PPC_PMAC))
+ depends on SMP
+ default y
+
+config SUSPEND_SMP
+ bool
+ depends on SUSPEND_SMP_POSSIBLE && PM_SLEEP
+ select HOTPLUG_CPU
+ default y
+
+config PM_SLEEP
+ bool
+ depends on SUSPEND || HIBERNATION
+ default y
+
+config SUSPEND
+ bool "Suspend to RAM and standby"
+ depends on PM
+ depends on !SMP || SUSPEND_SMP_POSSIBLE
+ default y
+ ---help---
+ Allow the system to enter sleep states in which main memory is
+ powered and thus its contents are preserved, such as the
+ suspend-to-RAM state (i.e. the ACPI S3 state).
+
config HIBERNATION
- bool "Hibernation"
- depends on PM && SWAP && (((X86 || PPC64_SWSUSP) && (!SMP || SUSPEND_SMP)) || ((FRV || PPC32) && !SMP))
+ bool "Hibernation (aka 'suspend to disk')"
+ depends on PM && SWAP
+ depends on ((X86 || PPC64_SWSUSP || FRV || PPC32) && !SMP) || SUSPEND_SMP_POSSIBLE
---help---
Enable the suspend to disk (STD) functionality, which is usually
called "hibernation" in user interfaces. STD checkpoints the
@@ -132,11 +160,6 @@
suspended image to. It will simply pick the first available swap
device.
-config SUSPEND_SMP
- bool
- depends on HOTPLUG_CPU && (X86 || PPC64) && PM
- default y
-
config APM_EMULATION
tristate "Advanced Power Management Emulation"
depends on PM && SYS_SUPPORTS_APM_EMULATION
diff --git a/kernel/power/Makefile b/kernel/power/Makefile
index c6b0376..f7dfff2 100644
--- a/kernel/power/Makefile
+++ b/kernel/power/Makefile
@@ -3,8 +3,9 @@
EXTRA_CFLAGS += -DDEBUG
endif
-obj-y := main.o process.o console.o
+obj-y := main.o
obj-$(CONFIG_PM_LEGACY) += pm.o
+obj-$(CONFIG_PM_SLEEP) += process.o console.o
obj-$(CONFIG_HIBERNATION) += swsusp.o disk.o snapshot.o swap.o user.o
obj-$(CONFIG_MAGIC_SYSRQ) += poweroff.o
diff --git a/kernel/power/main.c b/kernel/power/main.c
index cfba698..350b485 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -25,11 +25,13 @@
BLOCKING_NOTIFIER_HEAD(pm_chain_head);
-/*This is just an arbitrary number */
-#define FREE_PAGE_NUMBER (100)
-
DEFINE_MUTEX(pm_mutex);
+#ifdef CONFIG_SUSPEND
+
+/* This is just an arbitrary number */
+#define FREE_PAGE_NUMBER (100)
+
struct pm_ops *pm_ops;
/**
@@ -269,6 +271,8 @@
EXPORT_SYMBOL(pm_suspend);
+#endif /* CONFIG_SUSPEND */
+
decl_subsys(power,NULL,NULL);
@@ -285,13 +289,15 @@
static ssize_t state_show(struct kset *kset, char *buf)
{
+ char *s = buf;
+#ifdef CONFIG_SUSPEND
int i;
- char * s = buf;
for (i = 0; i < PM_SUSPEND_MAX; i++) {
if (pm_states[i] && valid_state(i))
s += sprintf(s,"%s ", pm_states[i]);
}
+#endif
#ifdef CONFIG_HIBERNATION
s += sprintf(s, "%s\n", "disk");
#else
@@ -304,11 +310,13 @@
static ssize_t state_store(struct kset *kset, const char *buf, size_t n)
{
+#ifdef CONFIG_SUSPEND
suspend_state_t state = PM_SUSPEND_STANDBY;
const char * const *s;
+#endif
char *p;
- int error;
int len;
+ int error = -EINVAL;
p = memchr(buf, '\n', n);
len = p ? p - buf : n;
@@ -316,17 +324,19 @@
/* First, check if we are requested to hibernate */
if (len == 4 && !strncmp(buf, "disk", len)) {
error = hibernate();
- return error ? error : n;
+ goto Exit;
}
+#ifdef CONFIG_SUSPEND
for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) {
if (*s && len == strlen(*s) && !strncmp(buf, *s, len))
break;
}
if (state < PM_SUSPEND_MAX && *s)
error = enter_state(state);
- else
- error = -EINVAL;
+#endif
+
+ Exit:
return error ? error : n;
}
diff --git a/kernel/power/power.h b/kernel/power/power.h
index 9080914..95fbf2d 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -176,9 +176,17 @@
extern void swsusp_show_speed(struct timeval *, struct timeval *,
unsigned int, char *);
+#ifdef CONFIG_SUSPEND
/* kernel/power/main.c */
-extern int suspend_enter(suspend_state_t state);
extern int suspend_devices_and_enter(suspend_state_t state);
+#else /* !CONFIG_SUSPEND */
+static inline int suspend_devices_and_enter(suspend_state_t state)
+{
+ return -ENOSYS;
+}
+#endif /* !CONFIG_SUSPEND */
+
+/* kernel/power/common.c */
extern struct blocking_notifier_head pm_chain_head;
static inline int pm_notifier_call_chain(unsigned long val)