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Date: Thu, 4 Sep 2014 14:21:05 -0700
From: Brian Norris <computersforpeace@...il.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: <stable@...r.kernel.org>, <linux-pm@...r.kernel.org>,
Linux Kernel <linux-kernel@...r.kernel.org>,
Brian Norris <computersforpeace@...il.com>,
"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH 3.10.y+] PM / sleep: Use valid_state() for platform-dependent sleep states only
From: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
[Upstream commit 43e8317b0bba1d6eb85f38a4a233d82d7c20d732]
Use the observation that, for platform-dependent sleep states
(PM_SUSPEND_STANDBY, PM_SUSPEND_MEM), a given state is either
always supported or always unsupported and store that information
in pm_states[] instead of calling valid_state() every time we
need to check it.
Also do not use valid_state() for PM_SUSPEND_FREEZE, which is always
valid, and move the pm_test_level validity check for PM_SUSPEND_FREEZE
directly into enter_state().
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Cc: <stable@...r.kernel.org> # 3.10+: 27ddcc6596e5: PM / sleep: Add state field to pm_states[] entries
Cc: <stable@...r.kernel.org> # 3.10+
---
This is a backport request for these two commits upstream:
27ddcc6596e5 PM / sleep: Add state field to pm_states[] entries
43e8317b0bba PM / sleep: Use valid_state() for platform-dependent sleep states only
Rafael ack'd this:
https://lkml.org/lkml/2014/9/4/543
I've tested these on 3.14, and it looks like they could go back as far as 3.10.
kernel/power/main.c | 9 ++++---
kernel/power/power.h | 2 --
kernel/power/suspend.c | 60 ++++++++++++++++++++++-----------------------
kernel/power/suspend_test.c | 2 +-
4 files changed, 36 insertions(+), 37 deletions(-)
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 8e818432253c..9f51f0ab3d86 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -296,7 +296,7 @@ static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr,
suspend_state_t i;
for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++)
- if (valid_state(i))
+ if (pm_states[i].state)
s += sprintf(s,"%s ", pm_states[i].label);
#endif
@@ -328,8 +328,9 @@ static suspend_state_t decode_state(const char *buf, size_t n)
#ifdef CONFIG_SUSPEND
for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++)
- if (len == strlen(s->label) && !strncmp(buf, s->label, len))
- return state;
+ if (s->state && len == strlen(s->label)
+ && !strncmp(buf, s->label, len))
+ return s->state;
#endif
return PM_SUSPEND_ON;
@@ -447,7 +448,7 @@ static ssize_t autosleep_show(struct kobject *kobj,
#ifdef CONFIG_SUSPEND
if (state < PM_SUSPEND_MAX)
- return sprintf(buf, "%s\n", valid_state(state) ?
+ return sprintf(buf, "%s\n", pm_states[state].state ?
pm_states[state].label : "error");
#endif
#ifdef CONFIG_HIBERNATION
diff --git a/kernel/power/power.h b/kernel/power/power.h
index 99539c5da844..c60f13b5270a 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -186,14 +186,12 @@ struct pm_sleep_state {
/* kernel/power/suspend.c */
extern struct pm_sleep_state pm_states[];
-extern bool valid_state(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;
}
-static inline bool valid_state(suspend_state_t state) { return false; }
#endif /* !CONFIG_SUSPEND */
#ifdef CONFIG_PM_TEST_SUSPEND
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 5d93b138a2d4..00aca60904b0 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -32,9 +32,9 @@
#include "power.h"
struct pm_sleep_state pm_states[PM_SUSPEND_MAX] = {
- [PM_SUSPEND_FREEZE] = { "freeze", PM_SUSPEND_FREEZE },
- [PM_SUSPEND_STANDBY] = { "standby", PM_SUSPEND_STANDBY },
- [PM_SUSPEND_MEM] = { "mem", PM_SUSPEND_MEM },
+ [PM_SUSPEND_FREEZE] = { .label = "freeze", .state = PM_SUSPEND_FREEZE },
+ [PM_SUSPEND_STANDBY] = { .label = "standby", },
+ [PM_SUSPEND_MEM] = { .label = "mem", },
};
static const struct platform_suspend_ops *suspend_ops;
@@ -68,42 +68,34 @@ void freeze_wake(void)
}
EXPORT_SYMBOL_GPL(freeze_wake);
+static bool valid_state(suspend_state_t state)
+{
+ /*
+ * PM_SUSPEND_STANDBY and PM_SUSPEND_MEM states need low level
+ * support and need to be valid to the low level
+ * implementation, no valid callback implies that none are valid.
+ */
+ return suspend_ops && suspend_ops->valid && suspend_ops->valid(state);
+}
+
/**
* suspend_set_ops - Set the global suspend method table.
* @ops: Suspend operations to use.
*/
void suspend_set_ops(const struct platform_suspend_ops *ops)
{
+ suspend_state_t i;
+
lock_system_sleep();
+
suspend_ops = ops;
+ for (i = PM_SUSPEND_STANDBY; i <= PM_SUSPEND_MEM; i++)
+ pm_states[i].state = valid_state(i) ? i : 0;
+
unlock_system_sleep();
}
EXPORT_SYMBOL_GPL(suspend_set_ops);
-bool valid_state(suspend_state_t state)
-{
- if (state == PM_SUSPEND_FREEZE) {
-#ifdef CONFIG_PM_DEBUG
- if (pm_test_level != TEST_NONE &&
- pm_test_level != TEST_FREEZER &&
- pm_test_level != TEST_DEVICES &&
- pm_test_level != TEST_PLATFORM) {
- printk(KERN_WARNING "Unsupported pm_test mode for "
- "freeze state, please choose "
- "none/freezer/devices/platform.\n");
- return false;
- }
-#endif
- return true;
- }
- /*
- * PM_SUSPEND_STANDBY and PM_SUSPEND_MEMORY states need lowlevel
- * support and need to be valid to the lowlevel
- * implementation, no valid callback implies that none are valid.
- */
- return suspend_ops && suspend_ops->valid && suspend_ops->valid(state);
-}
-
/**
* suspend_valid_only_mem - Generic memory-only valid callback.
*
@@ -330,9 +322,17 @@ static int enter_state(suspend_state_t state)
{
int error;
- if (!valid_state(state))
- return -ENODEV;
-
+ if (state == PM_SUSPEND_FREEZE) {
+#ifdef CONFIG_PM_DEBUG
+ if (pm_test_level != TEST_NONE && pm_test_level <= TEST_CPUS) {
+ pr_warning("PM: Unsupported test mode for freeze state,"
+ "please choose none/freezer/devices/platform.\n");
+ return -EAGAIN;
+ }
+#endif
+ } else if (!valid_state(state)) {
+ return -EINVAL;
+ }
if (!mutex_trylock(&pm_mutex))
return -EBUSY;
diff --git a/kernel/power/suspend_test.c b/kernel/power/suspend_test.c
index d4e3ab167a73..269b097e78ea 100644
--- a/kernel/power/suspend_test.c
+++ b/kernel/power/suspend_test.c
@@ -162,7 +162,7 @@ static int __init test_suspend(void)
/* PM is initialized by now; is that state testable? */
if (test_state == PM_SUSPEND_ON)
goto done;
- if (!valid_state(test_state)) {
+ if (!pm_states[test_state].state) {
printk(warn_bad_state, pm_states[test_state].label);
goto done;
}
--
1.9.1
--
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