kernel/include/linux/intel_rapl.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 *  Data types and headers for RAPL support
 *
 *  Copyright (C) 2019  Intel Corporation.
 *
 *  Author: Zhang Rui <rui.zhang@intel.com>
 */

#ifndef __INTEL_RAPL_H__
#define __INTEL_RAPL_H__

#include <linux/types.h>
#include <linux/powercap.h>
#include <linux/cpuhotplug.h>

enum rapl_if_type {
	RAPL_IF_MSR,	/* RAPL I/F using MSR registers */
	RAPL_IF_MMIO,	/* RAPL I/F using MMIO registers */
	RAPL_IF_TPMI,	/* RAPL I/F using TPMI registers */
};

enum rapl_domain_type {
	RAPL_DOMAIN_PACKAGE,	/* entire package/socket */
	RAPL_DOMAIN_PP0,	/* core power plane */
	RAPL_DOMAIN_PP1,	/* graphics uncore */
	RAPL_DOMAIN_DRAM,	/* DRAM control_type */
	RAPL_DOMAIN_PLATFORM,	/* PSys control_type */
	RAPL_DOMAIN_MAX,
};

enum rapl_domain_reg_id {
	RAPL_DOMAIN_REG_LIMIT,
	RAPL_DOMAIN_REG_STATUS,
	RAPL_DOMAIN_REG_PERF,
	RAPL_DOMAIN_REG_POLICY,
	RAPL_DOMAIN_REG_INFO,
	RAPL_DOMAIN_REG_PL4,
	RAPL_DOMAIN_REG_UNIT,
	RAPL_DOMAIN_REG_PL2,
	RAPL_DOMAIN_REG_MAX,
};

struct rapl_domain;

enum rapl_primitives {
	POWER_LIMIT1,
	POWER_LIMIT2,
	POWER_LIMIT4,
	ENERGY_COUNTER,
	FW_LOCK,
	FW_HIGH_LOCK,
	PL1_LOCK,
	PL2_LOCK,
	PL4_LOCK,

	PL1_ENABLE,		/* power limit 1, aka long term */
	PL1_CLAMP,		/* allow frequency to go below OS request */
	PL2_ENABLE,		/* power limit 2, aka short term, instantaneous */
	PL2_CLAMP,
	PL4_ENABLE,		/* power limit 4, aka max peak power */

	TIME_WINDOW1,		/* long term */
	TIME_WINDOW2,		/* short term */
	THERMAL_SPEC_POWER,
	MAX_POWER,

	MIN_POWER,
	MAX_TIME_WINDOW,
	THROTTLED_TIME,
	PRIORITY_LEVEL,

	PSYS_POWER_LIMIT1,
	PSYS_POWER_LIMIT2,
	PSYS_PL1_ENABLE,
	PSYS_PL2_ENABLE,
	PSYS_TIME_WINDOW1,
	PSYS_TIME_WINDOW2,
	/* below are not raw primitive data */
	AVERAGE_POWER,
	NR_RAPL_PRIMITIVES,
};

struct rapl_domain_data {
	u64 primitives[NR_RAPL_PRIMITIVES];
	unsigned long timestamp;
};

#define NR_POWER_LIMITS	(POWER_LIMIT4 + 1)

struct rapl_power_limit {
	struct powercap_zone_constraint *constraint;
	struct rapl_domain *domain;
	const char *name;
	bool locked;
	u64 last_power_limit;
};

struct rapl_package;

#define RAPL_DOMAIN_NAME_LENGTH 16

union rapl_reg {
	void __iomem *mmio;
	u32 msr;
	u64 val;
};

struct rapl_domain {
	char name[RAPL_DOMAIN_NAME_LENGTH];
	enum rapl_domain_type id;
	union rapl_reg regs[RAPL_DOMAIN_REG_MAX];
	struct powercap_zone power_zone;
	struct rapl_domain_data rdd;
	struct rapl_power_limit rpl[NR_POWER_LIMITS];
	u64 attr_map;		/* track capabilities */
	unsigned int state;
	unsigned int power_unit;
	unsigned int energy_unit;
	unsigned int time_unit;
	struct rapl_package *rp;
};

struct reg_action {
	union rapl_reg reg;
	u64 mask;
	u64 value;
	int err;
};

/**
 * struct rapl_if_priv: private data for different RAPL interfaces
 * @control_type:		Each RAPL interface must have its own powercap
 *				control type.
 * @platform_rapl_domain:	Optional. Some RAPL interface may have platform
 *				level RAPL control.
 * @pcap_rapl_online:		CPU hotplug state for each RAPL interface.
 * @reg_unit:			Register for getting energy/power/time unit.
 * @regs:			Register sets for different RAPL Domains.
 * @limits:			Number of power limits supported by each domain.
 * @read_raw:			Callback for reading RAPL interface specific
 *				registers.
 * @write_raw:			Callback for writing RAPL interface specific
 *				registers.
 * @defaults:			internal pointer to interface default settings
 * @rpi:			internal pointer to interface primitive info
 */
struct rapl_if_priv {
	enum rapl_if_type type;
	struct powercap_control_type *control_type;
	enum cpuhp_state pcap_rapl_online;
	union rapl_reg reg_unit;
	union rapl_reg regs[RAPL_DOMAIN_MAX][RAPL_DOMAIN_REG_MAX];
	int limits[RAPL_DOMAIN_MAX];
	int (*read_raw)(int id, struct reg_action *ra);
	int (*write_raw)(int id, struct reg_action *ra);
	void *defaults;
	void *rpi;
};

#ifdef CONFIG_PERF_EVENTS
/**
 * struct rapl_package_pmu_data: Per package data for PMU support
 * @scale:		Scale of 2^-32 Joules for each energy counter increase.
 * @lock:		Lock to protect n_active and active_list.
 * @n_active:		Number of active events.
 * @active_list:	List of active events.
 * @timer_interval:	Maximum timer expiration time before counter overflow.
 * @hrtimer:		Periodically update the counter to prevent overflow.
 */
struct rapl_package_pmu_data {
	u64 scale[RAPL_DOMAIN_MAX];
	raw_spinlock_t lock;
	int n_active;
	struct list_head active_list;
	ktime_t timer_interval;
	struct hrtimer hrtimer;
};
#endif

/* maximum rapl package domain name: package-%d-die-%d */
#define PACKAGE_DOMAIN_NAME_LENGTH 30

struct rapl_package {
	unsigned int id;	/* logical die id, equals physical 1-die systems */
	unsigned int nr_domains;
	unsigned long domain_map;	/* bit map of active domains */
	struct rapl_domain *domains;	/* array of domains, sized at runtime */
	struct powercap_zone *power_zone;	/* keep track of parent zone */
	unsigned long power_limit_irq;	/* keep track of package power limit
					 * notify interrupt enable status.
					 */
	struct list_head plist;
	int lead_cpu;		/* one active cpu per package for access */
	/* Track active cpus */
	struct cpumask cpumask;
	char name[PACKAGE_DOMAIN_NAME_LENGTH];
	struct rapl_if_priv *priv;
#ifdef CONFIG_PERF_EVENTS
	bool has_pmu;
	struct rapl_package_pmu_data pmu_data;
#endif
};

struct rapl_package *rapl_find_package_domain_cpuslocked(int id, struct rapl_if_priv *priv,
						       bool id_is_cpu);
struct rapl_package *rapl_add_package_cpuslocked(int id, struct rapl_if_priv *priv,
						 bool id_is_cpu);
void rapl_remove_package_cpuslocked(struct rapl_package *rp);

struct rapl_package *rapl_find_package_domain(int id, struct rapl_if_priv *priv, bool id_is_cpu);
struct rapl_package *rapl_add_package(int id, struct rapl_if_priv *priv, bool id_is_cpu);
void rapl_remove_package(struct rapl_package *rp);

#ifdef CONFIG_PERF_EVENTS
int rapl_package_add_pmu(struct rapl_package *rp);
void rapl_package_remove_pmu(struct rapl_package *rp);
#else
static inline int rapl_package_add_pmu(struct rapl_package *rp) { return 0; }
static inline void rapl_package_remove_pmu(struct rapl_package *rp) { }
#endif

#endif /* __INTEL_RAPL_H__ */