Merge tag 'pm-4.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management updates from Rafael Wysocki:
 "There are no real big ticket items here this time.

  The most noticeable change is probably the relocation of the OPP
  (Operating Performance Points) framework to its own directory under
  drivers/ as it has grown big enough for that. Also Viresh is now going
  to maintain it and send pull requests for it to me, so you will see
  this change in the git history going forward (but still not right
  now).

  Another noticeable set of changes is the modifications of the PM core,
  the PCI subsystem and the ACPI PM domain to allow of more integration
  between system-wide suspend/resume and runtime PM. For now it's just a
  way to avoid resuming devices from runtime suspend unnecessarily
  during system suspend (if the driver sets a flag to indicate its
  readiness for that) and in the works is an analogous mechanism to
  allow devices to stay suspended after system resume.

  In addition to that, we have some changes related to supporting
  frequency-invariant CPU utilization metrics in the scheduler and in
  the schedutil cpufreq governor on ARM and changes to add support for
  device performance states to the generic power domains (genpd)
  framework.

  The rest is mostly fixes and cleanups of various sorts.

  Specifics:

   - Relocate the OPP (Operating Performance Points) framework to its
     own directory under drivers/ and add support for power domain
     performance states to it (Viresh Kumar).

   - Modify the PM core, the PCI bus type and the ACPI PM domain to
     support power management driver flags allowing device drivers to
     specify their capabilities and preferences regarding the handling
     of devices with enabled runtime PM during system suspend/resume and
     clean up that code somewhat (Rafael Wysocki, Ulf Hansson).

   - Add frequency-invariant accounting support to the task scheduler on
     ARM and ARM64 (Dietmar Eggemann).

   - Fix PM QoS device resume latency framework to prevent "no
     restriction" requests from overriding requests with specific
     requirements and drop the confusing PM_QOS_FLAG_REMOTE_WAKEUP
     device PM QoS flag (Rafael Wysocki).

   - Drop legacy class suspend/resume operations from the PM core and
     drop legacy bus type suspend and resume callbacks from ARM/locomo
     (Rafael Wysocki).

   - Add min/max frequency support to devfreq and clean it up somewhat
     (Chanwoo Choi).

   - Rework wakeup support in the generic power domains (genpd)
     framework and update some of its users accordingly (Geert
     Uytterhoeven).

   - Convert timers in the PM core to use timer_setup() (Kees Cook).

   - Add support for exposing the SLP_S0 (Low Power S0 Idle) residency
     counter based on the LPIT ACPI table on Intel platforms (Srinivas
     Pandruvada).

   - Add per-CPU PM QoS resume latency support to the ladder cpuidle
     governor (Ramesh Thomas).

   - Fix a deadlock between the wakeup notify handler and the notifier
     removal in the ACPI core (Ville Syrjälä).

   - Fix a cpufreq schedutil governor issue causing it to use stale
     cached frequency values sometimes (Viresh Kumar).

   - Fix an issue in the system suspend core support code causing wakeup
     events detection to fail in some cases (Rajat Jain).

   - Fix the generic power domains (genpd) framework to prevent the PM
     core from using the direct-complete optimization with it as that is
     guaranteed to fail (Ulf Hansson).

   - Fix a minor issue in the cpuidle core and clean it up a bit (Gaurav
     Jindal, Nicholas Piggin).

   - Fix and clean up the intel_idle and ARM cpuidle drivers (Jason
     Baron, Len Brown, Leo Yan).

   - Fix a couple of minor issues in the OPP framework and clean it up
     (Arvind Yadav, Fabio Estevam, Sudeep Holla, Tobias Jordan).

   - Fix and clean up some cpufreq drivers and fix a minor issue in the
     cpufreq statistics code (Arvind Yadav, Bhumika Goyal, Fabio
     Estevam, Gautham Shenoy, Gustavo Silva, Marek Szyprowski, Masahiro
     Yamada, Robert Jarzmik, Zumeng Chen).

   - Fix minor issues in the system suspend and hibernation core, in
     power management documentation and in the AVS (Adaptive Voltage
     Scaling) framework (Helge Deller, Himanshu Jha, Joe Perches, Rafael
     Wysocki).

   - Fix some issues in the cpupower utility and document that Shuah
     Khan is going to maintain it going forward (Prarit Bhargava, Shuah
     Khan)"

* tag 'pm-4.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (88 commits)
  tools/power/cpupower: add libcpupower.so.0.0.1 to .gitignore
  tools/power/cpupower: Add 64 bit library detection
  intel_idle: Graceful probe failure when MWAIT is disabled
  cpufreq: schedutil: Reset cached_raw_freq when not in sync with next_freq
  freezer: Fix typo in freezable_schedule_timeout() comment
  PM / s2idle: Clear the events_check_enabled flag
  cpufreq: stats: Handle the case when trans_table goes beyond PAGE_SIZE
  cpufreq: arm_big_little: make cpufreq_arm_bL_ops structures const
  cpufreq: arm_big_little: make function arguments and structure pointer const
  cpuidle: Avoid assignment in if () argument
  cpuidle: Clean up cpuidle_enable_device() error handling a bit
  ACPI / PM: Fix acpi_pm_notifier_lock vs flush_workqueue() deadlock
  PM / Domains: Fix genpd to deal with drivers returning 1 from ->prepare()
  cpuidle: ladder: Add per CPU PM QoS resume latency support
  PM / QoS: Fix device resume latency framework
  PM / domains: Rework governor code to be more consistent
  PM / Domains: Remove gpd_dev_ops.active_wakeup() callback
  soc: rockchip: power-domain: Use GENPD_FLAG_ACTIVE_WAKEUP
  soc: mediatek: Use GENPD_FLAG_ACTIVE_WAKEUP
  ARM: shmobile: pm-rmobile: Use GENPD_FLAG_ACTIVE_WAKEUP
  ...

1 files changed, 228 insertions, 0 deletions

diff --git a/drivers/opp/opp.h b/drivers/opp/opp.h
new file mode 100644
index 000000000000..4d00061648a3
--- /dev/null
+++ b/drivers/opp/opp.h
@@ -0,0 +1,228 @@
+/*
+ * Generic OPP Interface
+ *
+ * Copyright (C) 2009-2010 Texas Instruments Incorporated.
+ *	Nishanth Menon
+ *	Romit Dasgupta
+ *	Kevin Hilman
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __DRIVER_OPP_H__
+#define __DRIVER_OPP_H__
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/kref.h>
+#include <linux/list.h>
+#include <linux/limits.h>
+#include <linux/pm_opp.h>
+#include <linux/notifier.h>
+
+struct clk;
+struct regulator;
+
+/* Lock to allow exclusive modification to the device and opp lists */
+extern struct mutex opp_table_lock;
+
+extern struct list_head opp_tables;
+
+/*
+ * Internal data structure organization with the OPP layer library is as
+ * follows:
+ * opp_tables (root)
+ *	|- device 1 (represents voltage domain 1)
+ *	|	|- opp 1 (availability, freq, voltage)
+ *	|	|- opp 2 ..
+ *	...	...
+ *	|	`- opp n ..
+ *	|- device 2 (represents the next voltage domain)
+ *	...
+ *	`- device m (represents mth voltage domain)
+ * device 1, 2.. are represented by opp_table structure while each opp
+ * is represented by the opp structure.
+ */
+
+/**
+ * struct dev_pm_opp - Generic OPP description structure
+ * @node:	opp table node. The nodes are maintained throughout the lifetime
+ *		of boot. It is expected only an optimal set of OPPs are
+ *		added to the library by the SoC framework.
+ *		IMPORTANT: the opp nodes should be maintained in increasing
+ *		order.
+ * @kref:	for reference count of the OPP.
+ * @available:	true/false - marks if this OPP as available or not
+ * @dynamic:	not-created from static DT entries.
+ * @turbo:	true if turbo (boost) OPP
+ * @suspend:	true if suspend OPP
+ * @pstate: Device's power domain's performance state.
+ * @rate:	Frequency in hertz
+ * @supplies:	Power supplies voltage/current values
+ * @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's
+ *		frequency from any other OPP's frequency.
+ * @opp_table:	points back to the opp_table struct this opp belongs to
+ * @np:		OPP's device node.
+ * @dentry:	debugfs dentry pointer (per opp)
+ *
+ * This structure stores the OPP information for a given device.
+ */
+struct dev_pm_opp {
+	struct list_head node;
+	struct kref kref;
+
+	bool available;
+	bool dynamic;
+	bool turbo;
+	bool suspend;
+	unsigned int pstate;
+	unsigned long rate;
+
+	struct dev_pm_opp_supply *supplies;
+
+	unsigned long clock_latency_ns;
+
+	struct opp_table *opp_table;
+
+	struct device_node *np;
+
+#ifdef CONFIG_DEBUG_FS
+	struct dentry *dentry;
+#endif
+};
+
+/**
+ * struct opp_device - devices managed by 'struct opp_table'
+ * @node:	list node
+ * @dev:	device to which the struct object belongs
+ * @dentry:	debugfs dentry pointer (per device)
+ *
+ * This is an internal data structure maintaining the devices that are managed
+ * by 'struct opp_table'.
+ */
+struct opp_device {
+	struct list_head node;
+	const struct device *dev;
+
+#ifdef CONFIG_DEBUG_FS
+	struct dentry *dentry;
+#endif
+};
+
+enum opp_table_access {
+	OPP_TABLE_ACCESS_UNKNOWN = 0,
+	OPP_TABLE_ACCESS_EXCLUSIVE = 1,
+	OPP_TABLE_ACCESS_SHARED = 2,
+};
+
+/**
+ * struct opp_table - Device opp structure
+ * @node:	table node - contains the devices with OPPs that
+ *		have been registered. Nodes once added are not modified in this
+ *		table.
+ * @head:	notifier head to notify the OPP availability changes.
+ * @dev_list:	list of devices that share these OPPs
+ * @opp_list:	table of opps
+ * @kref:	for reference count of the table.
+ * @lock:	mutex protecting the opp_list.
+ * @np:		struct device_node pointer for opp's DT node.
+ * @clock_latency_ns_max: Max clock latency in nanoseconds.
+ * @shared_opp: OPP is shared between multiple devices.
+ * @suspend_opp: Pointer to OPP to be used during device suspend.
+ * @supported_hw: Array of version number to support.
+ * @supported_hw_count: Number of elements in supported_hw array.
+ * @prop_name: A name to postfix to many DT properties, while parsing them.
+ * @clk: Device's clock handle
+ * @regulators: Supply regulators
+ * @regulator_count: Number of power supply regulators
+ * @genpd_performance_state: Device's power domain support performance state.
+ * @set_opp: Platform specific set_opp callback
+ * @set_opp_data: Data to be passed to set_opp callback
+ * @get_pstate: Platform specific get_pstate callback
+ * @dentry:	debugfs dentry pointer of the real device directory (not links).
+ * @dentry_name: Name of the real dentry.
+ *
+ * @voltage_tolerance_v1: In percentage, for v1 bindings only.
+ *
+ * This is an internal data structure maintaining the link to opps attached to
+ * a device. This structure is not meant to be shared to users as it is
+ * meant for book keeping and private to OPP library.
+ */
+struct opp_table {
+	struct list_head node;
+
+	struct blocking_notifier_head head;
+	struct list_head dev_list;
+	struct list_head opp_list;
+	struct kref kref;
+	struct mutex lock;
+
+	struct device_node *np;
+	unsigned long clock_latency_ns_max;
+
+	/* For backward compatibility with v1 bindings */
+	unsigned int voltage_tolerance_v1;
+
+	enum opp_table_access shared_opp;
+	struct dev_pm_opp *suspend_opp;
+
+	unsigned int *supported_hw;
+	unsigned int supported_hw_count;
+	const char *prop_name;
+	struct clk *clk;
+	struct regulator **regulators;
+	unsigned int regulator_count;
+	bool genpd_performance_state;
+
+	int (*set_opp)(struct dev_pm_set_opp_data *data);
+	struct dev_pm_set_opp_data *set_opp_data;
+	int (*get_pstate)(struct device *dev, unsigned long rate);
+
+#ifdef CONFIG_DEBUG_FS
+	struct dentry *dentry;
+	char dentry_name[NAME_MAX];
+#endif
+};
+
+/* Routines internal to opp core */
+void _get_opp_table_kref(struct opp_table *opp_table);
+struct opp_table *_find_opp_table(struct device *dev);
+struct opp_device *_add_opp_dev(const struct device *dev, struct opp_table *opp_table);
+void _dev_pm_opp_remove_table(struct opp_table *opp_table, struct device *dev, bool remove_all);
+void _dev_pm_opp_find_and_remove_table(struct device *dev, bool remove_all);
+struct dev_pm_opp *_opp_allocate(struct opp_table *opp_table);
+void _opp_free(struct dev_pm_opp *opp);
+int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, struct opp_table *opp_table);
+int _opp_add_v1(struct opp_table *opp_table, struct device *dev, unsigned long freq, long u_volt, bool dynamic);
+void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, bool of);
+struct opp_table *_add_opp_table(struct device *dev);
+
+#ifdef CONFIG_OF
+void _of_init_opp_table(struct opp_table *opp_table, struct device *dev);
+#else
+static inline void _of_init_opp_table(struct opp_table *opp_table, struct device *dev) {}
+#endif
+
+#ifdef CONFIG_DEBUG_FS
+void opp_debug_remove_one(struct dev_pm_opp *opp);
+int opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table);
+int opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table);
+void opp_debug_unregister(struct opp_device *opp_dev, struct opp_table *opp_table);
+#else
+static inline void opp_debug_remove_one(struct dev_pm_opp *opp) {}
+
+static inline int opp_debug_create_one(struct dev_pm_opp *opp,
+				       struct opp_table *opp_table)
+{ return 0; }
+static inline int opp_debug_register(struct opp_device *opp_dev,
+				     struct opp_table *opp_table)
+{ return 0; }
+
+static inline void opp_debug_unregister(struct opp_device *opp_dev,
+					struct opp_table *opp_table)
+{ }
+#endif		/* DEBUG_FS */
+
+#endif		/* __DRIVER_OPP_H__ */