/*
 * HiSilicon SoC Hardware event counters support
 *
 * Copyright (C) 2017 Hisilicon Limited
 * Author: Anurup M <anurup.m@huawei.com>
 *         Shaokun Zhang <zhangshaokun@hisilicon.com>
 *
 * This code is based on the uncore PMUs like arm-cci and arm-ccn.
 *
 * 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 __HISI_UNCORE_PMU_H__
#define __HISI_UNCORE_PMU_H__

#include <linux/cpumask.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/perf_event.h>
#include <linux/types.h>

#undef pr_fmt
#define pr_fmt(fmt)     "hisi_pmu: " fmt

#define HISI_MAX_COUNTERS 0x10
#define to_hisi_pmu(p)	(container_of(p, struct hisi_pmu, pmu))

#define HISI_PMU_ATTR(_name, _func, _config)				\
	(&((struct dev_ext_attribute[]) {				\
		{ __ATTR(_name, 0444, _func, NULL), (void *)_config }   \
	})[0].attr.attr)

#define HISI_PMU_FORMAT_ATTR(_name, _config)		\
	HISI_PMU_ATTR(_name, hisi_format_sysfs_show, (void *)_config)
#define HISI_PMU_EVENT_ATTR(_name, _config)		\
	HISI_PMU_ATTR(_name, hisi_event_sysfs_show, (unsigned long)_config)

struct hisi_pmu;

struct hisi_uncore_ops {
	void (*write_evtype)(struct hisi_pmu *, int, u32);
	int (*get_event_idx)(struct perf_event *);
	u64 (*read_counter)(struct hisi_pmu *, struct hw_perf_event *);
	void (*write_counter)(struct hisi_pmu *, struct hw_perf_event *, u64);
	void (*enable_counter)(struct hisi_pmu *, struct hw_perf_event *);
	void (*disable_counter)(struct hisi_pmu *, struct hw_perf_event *);
	void (*enable_counter_int)(struct hisi_pmu *, struct hw_perf_event *);
	void (*disable_counter_int)(struct hisi_pmu *, struct hw_perf_event *);
	void (*start_counters)(struct hisi_pmu *);
	void (*stop_counters)(struct hisi_pmu *);
};

struct hisi_pmu_hwevents {
	struct perf_event *hw_events[HISI_MAX_COUNTERS];
	DECLARE_BITMAP(used_mask, HISI_MAX_COUNTERS);
};

/* Generic pmu struct for different pmu types */
struct hisi_pmu {
	struct pmu pmu;
	const struct hisi_uncore_ops *ops;
	struct hisi_pmu_hwevents pmu_events;
	/* associated_cpus: All CPUs associated with the PMU */
	cpumask_t associated_cpus;
	/* CPU used for counting */
	int on_cpu;
	int irq;
	struct device *dev;
	struct hlist_node node;
	int sccl_id;
	int ccl_id;
	void __iomem *base;
	/* the ID of the PMU modules */
	u32 index_id;
	int num_counters;
	int counter_bits;
	/* check event code range */
	int check_event;
};

int hisi_uncore_pmu_counter_valid(struct hisi_pmu *hisi_pmu, int idx);
int hisi_uncore_pmu_get_event_idx(struct perf_event *event);
void hisi_uncore_pmu_read(struct perf_event *event);
int hisi_uncore_pmu_add(struct perf_event *event, int flags);
void hisi_uncore_pmu_del(struct perf_event *event, int flags);
void hisi_uncore_pmu_start(struct perf_event *event, int flags);
void hisi_uncore_pmu_stop(struct perf_event *event, int flags);
void hisi_uncore_pmu_set_event_period(struct perf_event *event);
void hisi_uncore_pmu_event_update(struct perf_event *event);
int hisi_uncore_pmu_event_init(struct perf_event *event);
void hisi_uncore_pmu_enable(struct pmu *pmu);
void hisi_uncore_pmu_disable(struct pmu *pmu);
ssize_t hisi_event_sysfs_show(struct device *dev,
			      struct device_attribute *attr, char *buf);
ssize_t hisi_format_sysfs_show(struct device *dev,
			       struct device_attribute *attr, char *buf);
ssize_t hisi_cpumask_sysfs_show(struct device *dev,
				struct device_attribute *attr, char *buf);
int hisi_uncore_pmu_online_cpu(unsigned int cpu, struct hlist_node *node);
int hisi_uncore_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node);
#endif /* __HISI_UNCORE_PMU_H__ */