The pm_ops.pm_disk_mode is used in totally bogus ways since
nobody really seems to understand what it actually does.
This patch clarifies the pm_disk_mode description.
It also removes all the arm and sh users that think they can veto
suspend to disk via pm_ops; not so since the user can always
do echo shutdown > /sys/power/disk, they need to find a better
way involving Kconfig or such.
ACPI is the only user left with a non-zero pm_disk_mode.
The patch also sets the default mode to shutdown again, but
when a new pm_ops is registered its pm_disk_mode is selected
as default, that way the default stays for ACPI where it is
apparently required.
Signed-off-by: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
Cc: David Brownell <david-b@xxxxxxxxxxx>
Cc: Pavel Machek <pavel@xxxxxx>
Cc: linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx
---
arch/arm/common/sharpsl_pm.c | 1
arch/arm/mach-at91/pm.c | 1
arch/arm/mach-omap1/pm.c | 1
arch/arm/mach-omap2/pm.c | 1
arch/arm/mach-pxa/pm.c | 4 ---
arch/arm/mach-sa1100/pm.c | 7 -----
arch/arm/plat-s3c24xx/pm.c | 9 ------
arch/sh/boards/hp6xx/pm.c | 7 -----
include/linux/pm.h | 23 +++++++++--------
kernel/power/disk.c | 56 ++++++++++++++++++++++++++++---------------
kernel/power/main.c | 6 +++-
11 files changed, 54 insertions(+), 62 deletions(-)
--- linux-2.6.orig/include/linux/pm.h 2007-03-20 12:41:38.423214909 +0100
+++ linux-2.6/include/linux/pm.h 2007-03-20 12:42:02.253214909 +0100
@@ -112,6 +112,8 @@ typedef int __bitwise suspend_state_t;
typedef int __bitwise suspend_disk_method_t;
+/* invalid must be 0 so struct pm_ops initialisers can leave it out */
+#define PM_DISK_INVALID ((__force suspend_disk_method_t) 0)
#define PM_DISK_FIRMWARE ((__force suspend_disk_method_t) 1)
#define PM_DISK_PLATFORM ((__force suspend_disk_method_t) 2)
#define PM_DISK_SHUTDOWN ((__force suspend_disk_method_t) 3)
@@ -137,17 +139,16 @@ typedef int __bitwise suspend_disk_metho
* @finish: Called when the system has left the given state and all devices
* are resumed. The return value is ignored.
*
- * @pm_disk_mode: Set to the disk method that the user should be able to
- * configure for suspend-to-disk. Since %PM_DISK_SHUTDOWN,
- * %PM_DISK_REBOOT, %PM_DISK_TEST and %PM_DISK_TESTPROC
- * are always allowed, currently only %PM_DISK_PLATFORM
- * makes sense. If the user then choses %PM_DISK_PLATFORM,
- * the @prepare call will be called before suspending to disk
- * (if present), the @enter call should be present and will
- * be called after all state has been saved and the machine
- * is ready to be shut down/suspended/..., and the @finish
- * callback is called after state has been restored. All
- * these calls are called with %PM_SUSPEND_DISK as the state.
+ * @pm_disk_mode: The generic code always allows one of the shutdown methods
+ * %PM_DISK_SHUTDOWN, %PM_DISK_REBOOT, %PM_DISK_TEST and
+ * %PM_DISK_TESTPROC. If this variable is set, the mode it is set
+ * to is allowed in addition to those modes and is also made default.
+ * When this mode is sent selected, the @prepare call will be called
+ * before suspending to disk (if present), the @enter call should be
+ * present and will be called after all state has been saved and the
+ * machine is ready to be powered off; the @finish callback is called
+ * after state has been restored. All these calls are called with
+ * %PM_SUSPEND_DISK as the state.
*/
struct pm_ops {
int (*valid)(suspend_state_t state);
--- linux-2.6.orig/kernel/power/disk.c 2007-03-20 12:41:38.463214909 +0100
+++ linux-2.6/kernel/power/disk.c 2007-03-20 12:42:02.263214909 +0100
@@ -39,7 +39,13 @@ static inline int platform_prepare(void)
{
int error = 0;
- if (pm_disk_mode == PM_DISK_PLATFORM) {
+ switch (pm_disk_mode) {
+ case PM_DISK_TEST:
+ case PM_DISK_TESTPROC:
+ case PM_DISK_SHUTDOWN:
+ case PM_DISK_REBOOT:
+ break;
+ default:
if (pm_ops && pm_ops->prepare)
error = pm_ops->prepare(PM_SUSPEND_DISK);
}
@@ -48,31 +54,33 @@ static inline int platform_prepare(void)
/**
* power_down - Shut machine down for hibernate.
- * @mode: Suspend-to-disk mode
*
- * Use the platform driver, if configured so, and return gracefully if it
- * fails.
- * Otherwise, try to power off and reboot. If they fail, halt the machine,
- * there ain't no turning back.
+ * Use the platform driver, if configured so; otherwise try
+ * to power off or reboot.
*/
-static void power_down(suspend_disk_method_t mode)
+static void power_down(void)
{
disable_nonboot_cpus();
- switch(mode) {
- case PM_DISK_PLATFORM:
- if (pm_ops && pm_ops->enter) {
- kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK);
- pm_ops->enter(PM_SUSPEND_DISK);
- break;
- }
+
+ switch (pm_disk_mode) {
+ case PM_DISK_TEST:
+ case PM_DISK_TESTPROC:
+ break;
case PM_DISK_SHUTDOWN:
kernel_power_off();
break;
case PM_DISK_REBOOT:
kernel_restart(NULL);
break;
+ default:
+ if (pm_ops && pm_ops->enter) {
+ kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK);
+ pm_ops->enter(PM_SUSPEND_DISK);
+ break;
+ }
}
+
kernel_halt();
/* Valid image is on the disk, if we continue we risk serious data corruption
after resume. */
@@ -82,7 +90,13 @@ static void power_down(suspend_disk_meth
static inline void platform_finish(void)
{
- if (pm_disk_mode == PM_DISK_PLATFORM) {
+ switch (pm_disk_mode) {
+ case PM_DISK_TEST:
+ case PM_DISK_TESTPROC:
+ case PM_DISK_SHUTDOWN:
+ case PM_DISK_REBOOT:
+ break;
+ default:
if (pm_ops && pm_ops->finish)
pm_ops->finish(PM_SUSPEND_DISK);
}
@@ -167,7 +181,7 @@ int pm_suspend_disk(void)
pr_debug("PM: writing image.\n");
error = swsusp_write();
if (!error)
- power_down(pm_disk_mode);
+ power_down();
else {
swsusp_free();
goto Thaw;
@@ -347,10 +361,14 @@ static ssize_t disk_store(struct subsyst
}
}
if (mode) {
- if (mode == PM_DISK_SHUTDOWN || mode == PM_DISK_REBOOT ||
- mode == PM_DISK_TEST || mode == PM_DISK_TESTPROC) {
+ switch (mode) {
+ case PM_DISK_SHUTDOWN:
+ case PM_DISK_REBOOT:
+ case PM_DISK_TEST:
+ case PM_DISK_TESTPROC:
pm_disk_mode = mode;
- } else {
+ break;
+ default:
if (pm_ops && pm_ops->enter &&
(mode == pm_ops->pm_disk_mode))
pm_disk_mode = mode;
--- linux-2.6.orig/kernel/power/main.c 2007-03-20 12:41:38.543214909 +0100
+++ linux-2.6/kernel/power/main.c 2007-03-20 12:42:02.263214909 +0100
@@ -30,7 +30,7 @@
DEFINE_MUTEX(pm_mutex);
struct pm_ops *pm_ops;
-suspend_disk_method_t pm_disk_mode = PM_DISK_PLATFORM;
+suspend_disk_method_t pm_disk_mode = PM_DISK_SHUTDOWN;
/**
* pm_set_ops - Set the global power method table.
@@ -41,6 +41,10 @@ void pm_set_ops(struct pm_ops * ops)
{
mutex_lock(&pm_mutex);
pm_ops = ops;
+ if (ops && ops->pm_disk_mode != PM_DISK_INVALID) {
+ pm_disk_mode = ops->pm_disk_mode;
+ } else
+ pm_disk_mode = PM_DISK_SHUTDOWN;
mutex_unlock(&pm_mutex);
}
--- linux-2.6.orig/arch/arm/common/sharpsl_pm.c 2007-03-20 12:41:38.673214909 +0100
+++ linux-2.6/arch/arm/common/sharpsl_pm.c 2007-03-20 12:42:02.263214909 +0100
@@ -766,7 +766,6 @@ static void sharpsl_apm_get_power_status
}
static struct pm_ops sharpsl_pm_ops = {
- .pm_disk_mode = PM_DISK_FIRMWARE,
.prepare = pxa_pm_prepare,
.enter = corgi_pxa_pm_enter,
.finish = pxa_pm_finish,
--- linux-2.6.orig/arch/arm/mach-at91/pm.c 2007-03-20 12:41:38.743214909 +0100
+++ linux-2.6/arch/arm/mach-at91/pm.c 2007-03-20 12:42:02.263214909 +0100
@@ -201,7 +201,6 @@ error:
static struct pm_ops at91_pm_ops ={
- .pm_disk_mode = 0,
.valid = at91_pm_valid_state,
.prepare = at91_pm_prepare,
.enter = at91_pm_enter,
--- linux-2.6.orig/arch/arm/mach-omap1/pm.c 2007-03-20 12:41:38.763214909 +0100
+++ linux-2.6/arch/arm/mach-omap1/pm.c 2007-03-20 12:42:02.263214909 +0100
@@ -698,7 +698,6 @@ static struct irqaction omap_wakeup_irq
static struct pm_ops omap_pm_ops ={
- .pm_disk_mode = 0,
.prepare = omap_pm_prepare,
.enter = omap_pm_enter,
.finish = omap_pm_finish,
--- linux-2.6.orig/arch/arm/mach-omap2/pm.c 2007-03-20 12:41:38.833214909 +0100
+++ linux-2.6/arch/arm/mach-omap2/pm.c 2007-03-20 12:42:02.263214909 +0100
@@ -370,7 +370,6 @@ static int omap2_pm_finish(suspend_state
}
static struct pm_ops omap_pm_ops = {
- .pm_disk_mode = 0,
.prepare = omap2_pm_prepare,
.enter = omap2_pm_enter,
.finish = omap2_pm_finish,
--- linux-2.6.orig/arch/arm/mach-pxa/pm.c 2007-03-20 12:41:38.853214909 +0100
+++ linux-2.6/arch/arm/mach-pxa/pm.c 2007-03-20 12:42:02.263214909 +0100
@@ -223,11 +223,7 @@ int pxa_pm_finish(suspend_state_t state)
EXPORT_SYMBOL_GPL(pxa_pm_finish);
-/*
- * Set to PM_DISK_FIRMWARE so we can quickly veto suspend-to-disk.
- */
static struct pm_ops pxa_pm_ops = {
- .pm_disk_mode = PM_DISK_FIRMWARE,
.prepare = pxa_pm_prepare,
.enter = pxa_pm_enter,
.finish = pxa_pm_finish,
--- linux-2.6.orig/arch/arm/mach-sa1100/pm.c 2007-03-20 12:41:38.903214909 +0100
+++ linux-2.6/arch/arm/mach-sa1100/pm.c 2007-03-20 12:42:02.273214909 +0100
@@ -59,9 +59,6 @@ static int sa11x0_pm_enter(suspend_state
unsigned long gpio, sleep_save[SLEEP_SAVE_SIZE];
struct timespec delta, rtc;
- if (state != PM_SUSPEND_MEM)
- return -EINVAL;
-
/* preserve current time */
rtc.tv_sec = RCNR;
rtc.tv_nsec = 0;
@@ -134,11 +131,7 @@ unsigned long sleep_phys_sp(void *sp)
return virt_to_phys(sp);
}
-/*
- * Set to PM_DISK_FIRMWARE so we can quickly veto suspend-to-disk.
- */
static struct pm_ops sa11x0_pm_ops = {
- .pm_disk_mode = PM_DISK_FIRMWARE,
.enter = sa11x0_pm_enter,
};
--- linux-2.6.orig/arch/arm/plat-s3c24xx/pm.c 2007-03-20 12:41:38.953214909 +0100
+++ linux-2.6/arch/arm/plat-s3c24xx/pm.c 2007-03-20 12:42:02.273214909 +0100
@@ -511,11 +511,6 @@ static int s3c2410_pm_enter(suspend_stat
return -EINVAL;
}
- if (state != PM_SUSPEND_MEM) {
- printk(KERN_ERR PFX "error: only PM_SUSPEND_MEM supported\n");
- return -EINVAL;
- }
-
/* check if we have anything to wake-up with... bad things seem
* to happen if you suspend with no wakeup (system will often
* require a full power-cycle)
@@ -633,11 +628,7 @@ static int s3c2410_pm_finish(suspend_sta
return 0;
}
-/*
- * Set to PM_DISK_FIRMWARE so we can quickly veto suspend-to-disk.
- */
static struct pm_ops s3c2410_pm_ops = {
- .pm_disk_mode = PM_DISK_FIRMWARE,
.prepare = s3c2410_pm_prepare,
.enter = s3c2410_pm_enter,
.finish = s3c2410_pm_finish,
--- linux-2.6.orig/arch/sh/boards/hp6xx/pm.c 2007-03-20 12:41:39.163214909 +0100
+++ linux-2.6/arch/sh/boards/hp6xx/pm.c 2007-03-20 12:42:02.273214909 +0100
@@ -27,9 +27,6 @@ static int hp6x0_pm_enter(suspend_state_
u16 hd64461_stbcr;
#endif
- if (state != PM_SUSPEND_MEM)
- return -EINVAL;
-
#ifdef CONFIG_HD64461_ENABLER
outb(0, HD64461_PCC1CSCIER);
@@ -70,11 +67,7 @@ static int hp6x0_pm_enter(suspend_state_
return 0;
}
-/*
- * Set to PM_DISK_FIRMWARE so we can quickly veto suspend-to-disk.
- */
static struct pm_ops hp6x0_pm_ops = {
- .pm_disk_mode = PM_DISK_FIRMWARE,
.enter = hp6x0_pm_enter,
};
--
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