/*

 * pfmlib_perf_events_raw.c: support for raw event syntax

 *

 * Copyright (c) 2014 Google, Inc. All rights reserved

 * Contributed by Stephane Eranian <eranian@google.com>

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies

 * of the Software, and to permit persons to whom the Software is furnished to do so,

 * subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in all

 * copies or substantial portions of the Software.

 *

 * 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.

 */

#include <sys/types.h>

#include <string.h>

#include <stdlib.h>

#include <stdio.h>

#include <unistd.h>

#include <ctype.h>

#include "pfmlib_priv.h"

#include "pfmlib_perf_event_priv.h"

static int

pfm_perf_raw_detect(void *this)

{

#ifdef __linux__

	/* ought to find a better way of detecting PERF */

#define PERF_OLD_PROC_FILE "/proc/sys/kernel/perf_counter_paranoid"

#define PERF_PROC_FILE "/proc/sys/kernel/perf_event_paranoid"

	return !(access(PERF_PROC_FILE, F_OK)

		  && access(PERF_OLD_PROC_FILE, F_OK)) ? PFM_SUCCESS: PFM_ERR_NOTSUPP;

#else

	return PFM_SUCCESS;

#endif

}

static int

pfm_perf_raw_get_event_first(void *this)

{

	return 0;

}

static int

pfm_perf_raw_get_event_next(void *this, int idx)

{

	/* only one pseudo event */

	return -1;

}

static int

pfm_perf_raw_get_encoding(void *this, pfmlib_event_desc_t *e)

{

	/*

	 * actual enoding done in pfm_perf_raw_match_event()

	 */

	e->fstr[0] = '\0';

	evt_strcat(e->fstr, "r%"PRIx64, e->codes[0]);

	return PFM_SUCCESS;

}

static int

pfm_perf_raw_get_perf_encoding(void *this, pfmlib_event_desc_t *e)

{

	struct perf_event_attr *attr;

	attr = e->os_data;

	attr->type = PERF_TYPE_RAW;

	attr->config = e->codes[0];

	attr->config1 = e->codes[1];

	attr->config2 = e->codes[2];

	return PFM_SUCCESS;

}

static int

pfm_perf_raw_event_is_valid(void *this, int idx)

{

	return idx == 0;

}

static int

pfm_perf_raw_get_event_attr_info(void *this, int idx, int attr_idx, pfmlib_event_attr_info_t *info)

{

	return PFM_ERR_ATTR;

}

static int

pfm_perf_raw_get_event_info(void *this, int idx, pfm_event_info_t *info)

{

	pfmlib_pmu_t *pmu = this;

	info->name  = "r0000";

	info->desc  = "perf_events raw event syntax: r[0-9a-fA-F]+",

	info->code  = 0;

	info->equiv = NULL;

	info->idx   = 0;

	info->pmu   = pmu->pmu;

	info->is_precise = 0;

	/* unit masks + modifiers */

	info->nattrs  = 0;

	return PFM_SUCCESS;

}

static unsigned int

pfm_perf_raw_get_event_nattrs(void *this, int idx)

{

	return 0;

}

/*

 * remove attrs which are in conflicts (or duplicated) with os layer

 */

static void

pfm_perf_raw_perf_validate_pattrs(void *this, pfmlib_event_desc_t *e)

{

}

/*

 * returns 0 if match (like strcmp())

 */

static int

pfm_perf_raw_match_event(void *this, pfmlib_event_desc_t *d, const char *e, const char *s)

{

	uint64_t code;

	int ret;

	if (*s != 'r'  || !isxdigit(*(s+1)))

		return 1;

	ret = sscanf(s+1, "%"PRIx64, &code);

	if (ret != 1)

		return 1;

	/*

	 * stash code in final position

	 */

	d->codes[0] = code;

	d->count = 1;

	return 0;

}

pfmlib_pmu_t perf_event_raw_support={

	.desc			= "perf_events raw PMU",

	.name			= "perf_raw",

	.pmu			= PFM_PMU_PERF_EVENT_RAW,

	.pme_count		= 1,

	.type			= PFM_PMU_TYPE_OS_GENERIC,

	.max_encoding		= 1,

	.supported_plm		= PERF_PLM_ALL,

	.pmu_detect		= pfm_perf_raw_detect,

	.get_event_encoding[PFM_OS_NONE] = pfm_perf_raw_get_encoding,

	 PFMLIB_ENCODE_PERF(pfm_perf_raw_get_perf_encoding),

	.get_event_first	= pfm_perf_raw_get_event_first,

	.get_event_next		= pfm_perf_raw_get_event_next,

	.event_is_valid		= pfm_perf_raw_event_is_valid,

	.get_event_info		= pfm_perf_raw_get_event_info,

	.get_event_attr_info	= pfm_perf_raw_get_event_attr_info,

	.get_event_nattrs	= pfm_perf_raw_get_event_nattrs,

	.match_event		= pfm_perf_raw_match_event,

	 PFMLIB_VALID_PERF_PATTRS(pfm_perf_raw_perf_validate_pattrs),

};