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PM, libnvdimm: Add runtime firmware activation support

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Abstract platform specific mechanics for nvdimm firmware activation
behind a handful of generic ops. At the bus level ->activate_state()
indicates the unified state (idle, busy, armed) of all DIMMs on the bus,
and ->capability() indicates the system state expectations for activate.
At the DIMM level ->activate_state() indicates the per-DIMM state,
->activate_result() indicates the outcome of the last activation
attempt, and ->arm() attempts to transition the DIMM from 'idle' to
'armed'.

A new hibernate_quiet_exec() facility is added to support firmware
activation in an OS defined system quiesce state. It leverages the fact
that the hibernate-freeze state wants to assert that a memory
hibernation snapshot can be taken. This is in contrast to a platform
firmware defined quiesce state that may forcefully quiet the memory
controller independent of whether an individual device-driver properly
supports hibernate-freeze.

The libnvdimm sysfs interface is extended to support detection of a
firmware activate capability. The mechanism supports enumeration and
triggering of firmware activate, optionally in the
hibernate_quiet_exec() context.

[rafael: hibernate_quiet_exec() proposal]
[vishal: fix up sparse warning, grammar in Documentation/]

Cc: Pavel Machek <pavel@ucw.cz>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Len Brown <len.brown@intel.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Reported-by: kernel test robot <lkp@intel.com>
Co-developed-by: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Signed-off-by: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
This commit is contained in:
Dan Williams
2020-07-20 15:08:18 -07:00
committed by Vishal Verma
parent 5cf81ce189
commit 48001ea50d
8 changed files with 500 additions and 0 deletions
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97
kernel/power/hibernate.c
View File

@@ -795,6 +795,103 @@ int hibernate(void)
return error;
}
/**
* hibernate_quiet_exec - Execute a function with all devices frozen.
* @func: Function to execute.
* @data: Data pointer to pass to @func.
*
* Return the @func return value or an error code if it cannot be executed.
*/
int hibernate_quiet_exec(int (*func)(void *data), void *data)
{
int error, nr_calls = 0;
lock_system_sleep();
if (!hibernate_acquire()) {
error = -EBUSY;
goto unlock;
}
pm_prepare_console();
error = __pm_notifier_call_chain(PM_HIBERNATION_PREPARE, -1, &nr_calls);
if (error) {
nr_calls--;
goto exit;
}
error = freeze_processes();
if (error)
goto exit;
lock_device_hotplug();
pm_suspend_clear_flags();
error = platform_begin(true);
if (error)
goto thaw;
error = freeze_kernel_threads();
if (error)
goto thaw;
error = dpm_prepare(PMSG_FREEZE);
if (error)
goto dpm_complete;
suspend_console();
error = dpm_suspend(PMSG_FREEZE);
if (error)
goto dpm_resume;
error = dpm_suspend_end(PMSG_FREEZE);
if (error)
goto dpm_resume;
error = platform_pre_snapshot(true);
if (error)
goto skip;
error = func(data);
skip:
platform_finish(true);
dpm_resume_start(PMSG_THAW);
dpm_resume:
dpm_resume(PMSG_THAW);
resume_console();
dpm_complete:
dpm_complete(PMSG_THAW);
thaw_kernel_threads();
thaw:
platform_end(true);
unlock_device_hotplug();
thaw_processes();
exit:
__pm_notifier_call_chain(PM_POST_HIBERNATION, nr_calls, NULL);
pm_restore_console();
hibernate_release();
unlock:
unlock_system_sleep();
return error;
}
EXPORT_SYMBOL_GPL(hibernate_quiet_exec);
/**
* software_resume - Resume from a saved hibernation image.