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Power management fixes for 5.12-rc5 

- Modify the runtime PM device suspend to avoid suspending
    supplier devices before the consumer device's status changes
    to RPM_SUSPENDED (Rafael Wysocki).
 
  - Change the Energy Model code to prevent it from attempting to
    create its main debugfs directory too early (Lukasz Luba).
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Merge tag 'pm-5.12-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "These fix an issue related to device links in the runtime PM framework
  and debugfs usage in the Energy Model code.

  Specifics:

   - Modify the runtime PM device suspend to avoid suspending supplier
     devices before the consumer device's status changes to
     RPM_SUSPENDED (Rafael Wysocki)

   - Change the Energy Model code to prevent it from attempting to
     create its main debugfs directory too early (Lukasz Luba)"

* tag 'pm-5.12-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  PM: EM: postpone creating the debugfs dir till fs_initcall
  PM: runtime: Defer suspending suppliers
This commit is contained in:
Linus Torvalds 2021-03-26 11:29:36 -07:00
parent eb3991ef2c 6f3a283c2f
commit 8a3cbdda18
2 changed files with 40 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
drivers/base/power/runtime.c
View File

@ -305,7 +305,7 @@ static int rpm_get_suppliers(struct device *dev)
return 0;
}
static void rpm_put_suppliers(struct device *dev)
static void __rpm_put_suppliers(struct device *dev, bool try_to_suspend)
{
struct device_link *link;
@ -313,10 +313,30 @@ static void rpm_put_suppliers(struct device *dev)
device_links_read_lock_held()) {
while (refcount_dec_not_one(&link->rpm_active))
pm_runtime_put(link->supplier);
pm_runtime_put_noidle(link->supplier);
if (try_to_suspend)
pm_request_idle(link->supplier);
}
}
static void rpm_put_suppliers(struct device *dev)
{
__rpm_put_suppliers(dev, true);
}
static void rpm_suspend_suppliers(struct device *dev)
{
struct device_link *link;
int idx = device_links_read_lock();
list_for_each_entry_rcu(link, &dev->links.suppliers, c_node,
device_links_read_lock_held())
pm_request_idle(link->supplier);
device_links_read_unlock(idx);
}
/**
* __rpm_callback - Run a given runtime PM callback for a given device.
* @cb: Runtime PM callback to run.
@ -344,8 +364,10 @@ static int __rpm_callback(int (*cb)(struct device *), struct device *dev)
idx = device_links_read_lock();
retval = rpm_get_suppliers(dev);
if (retval)
if (retval) {
rpm_put_suppliers(dev);
goto fail;
}
device_links_read_unlock(idx);
}
@ -368,9 +390,9 @@ static int __rpm_callback(int (*cb)(struct device *), struct device *dev)
|| (dev->power.runtime_status == RPM_RESUMING && retval))) {
idx = device_links_read_lock();
fail:
rpm_put_suppliers(dev);
__rpm_put_suppliers(dev, false);
fail:
device_links_read_unlock(idx);
}
@ -642,8 +664,11 @@ static int rpm_suspend(struct device *dev, int rpmflags)
goto out;
}
if (dev->power.irq_safe)
goto out;
/* Maybe the parent is now able to suspend. */
if (parent && !parent->power.ignore_children && !dev->power.irq_safe) {
if (parent && !parent->power.ignore_children) {
spin_unlock(&dev->power.lock);
spin_lock(&parent->power.lock);
@ -652,6 +677,14 @@ static int rpm_suspend(struct device *dev, int rpmflags)
spin_lock(&dev->power.lock);
}
/* Maybe the suppliers are now able to suspend. */
if (dev->power.links_count > 0) {
spin_unlock_irq(&dev->power.lock);
rpm_suspend_suppliers(dev);
spin_lock_irq(&dev->power.lock);
}
out:
trace_rpm_return_int_rcuidle(dev, _THIS_IP_, retval);

2
kernel/power/energy_model.c
View File

@ -98,7 +98,7 @@ static int __init em_debug_init(void)
return 0;
}
core_initcall(em_debug_init);
fs_initcall(em_debug_init);
#else /* CONFIG_DEBUG_FS */
static void em_debug_create_pd(struct device *dev) {}
static void em_debug_remove_pd(struct device *dev) {}