/*
 * Copyright (c) 2018 Intel Corporation. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#ifndef _OFI_PERF_H_
#define _OFI_PERF_H_

#include "config.h"

#include <assert.h>
#include <string.h>
#include <ofi_osd.h>
#include <rdma/providers/fi_prov.h>


#ifdef __cplusplus
extern "C" {
#endif


enum ofi_perf_domain {
	OFI_PMU_CPU,
	OFI_PMU_CACHE,
	OFI_PMU_OS,
	OFI_PMU_NIC
};

enum {
	OFI_PMC_FLAG_READ	= 1 << 0,
	OFI_PMC_FLAG_WRITE	= 1 << 1,
	OFI_PMC_FLAG_MISS	= 1 << 2,
};

enum {
	OFI_PMC_CPU_CYCLES,
	OFI_PMC_CPU_INSTR,
};

enum {
	OFI_PMC_CACHE_L1_DATA,
	OFI_PMC_CACHE_L1_INSTR,
	OFI_PMC_CACHE_TLB_DATA,
	OFI_PMC_CACHE_TLB_INSTR,
};

enum {
	OFI_PMC_OS_PAGE_FAULT
};

/* NIC counters TBD */

struct ofi_perf_data {
	uint64_t	start;
	uint64_t	sum;
	uint64_t	events;
};


void ofi_perf_init(void);
extern enum ofi_perf_domain	perf_domain;
extern uint32_t			perf_cntr;
extern uint32_t			perf_flags;


/*
 * Performance management unit:
 *
 * Access to a PMU is platform specific.  If an osd.h file provides methods
 * to access a PMU, it should define HAVE_LINUX_PERF_RDPMC and provide
 * implementations for the following functions.  Platforms that do not
 * support PMUs will default to no-op definitions.
 */

#if HAVE_LINUX_PERF_RDPMC

struct ofi_perf_ctx;

int ofi_pmu_open(struct ofi_perf_ctx **ctx,
		 enum ofi_perf_domain domain, uint32_t cntr_id, uint32_t flags);
uint64_t ofi_pmu_read(struct ofi_perf_ctx *ctx);
void ofi_pmu_close(struct ofi_perf_ctx *ctx);

#else /* HAVE_LINUX_PERF_RDPMC */

struct ofi_perf_ctx {
	int dummy;
};

static inline int ofi_pmu_open(struct ofi_perf_ctx **ctx,
			       enum ofi_perf_domain domain, uint32_t cntr_id,
			       uint32_t flags)
{
	*ctx = NULL;
	return 0;
}

static inline uint64_t ofi_pmu_read(struct ofi_perf_ctx *ctx)
{
	return 0;
}

static inline void ofi_pmu_close(struct ofi_perf_ctx *ctx)
{
}
#endif /* HAVE_LINUX_PERF_RDPMC */


static inline void ofi_perf_reset(struct ofi_perf_data *data)
{
	memset(data, 0, sizeof *data);
}

static inline void ofi_perf_start(struct ofi_perf_ctx *ctx,
				  struct ofi_perf_data *data)
{
	data->start = ofi_pmu_read(ctx);
}

static inline void ofi_perf_end(struct ofi_perf_ctx *ctx,
				struct ofi_perf_data *data)
{
	data->sum += ofi_pmu_read(ctx) - data->start;
	data->events++;
}


struct ofi_perfset {
	const struct fi_provider *prov;
	size_t			size;
	struct ofi_perf_ctx	*ctx;
	struct ofi_perf_data	*data;
};

int ofi_perfset_create(const struct fi_provider *prov,
		       struct ofi_perfset *set, size_t size,
		       enum ofi_perf_domain domain, uint32_t cntr_id,
		       uint32_t flags);
void ofi_perfset_close(struct ofi_perfset *set);

void ofi_perfset_log(struct ofi_perfset *set, const char **names);

static inline void ofi_perfset_start(struct ofi_perfset *set, size_t index)
{
	assert(index < set->size);
	ofi_perf_start(set->ctx, &set->data[index]);
}

static inline void ofi_perfset_end(struct ofi_perfset *set, size_t index)
{
	assert(index < set->size);
	ofi_perf_end(set->ctx, &set->data[index]);
}


#ifdef __cplusplus
}
#endif

#endif /* _OFI_PERF_H_ */