/*

 * check_events.c - check if event assignment is possible

 *

 * Copyright (c) 2008 Google, Inc

 * Contributed by Stephane Eranian <eranian@gmail.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.

 *

 * This file is part of libpfm, a performance monitoring support library for

 * applications on Linux.

 */

#include <sys/types.h>

#include <inttypes.h>

#include <stdio.h>

#include <stdlib.h>

#include <stdarg.h>

#include <errno.h>

#include <unistd.h>

#include <string.h>

#include <inttypes.h>

#include <perfmon/pfmlib.h>

#define NUM_PMCS PFMLIB_MAX_PMCS

#define NUM_PMDS PFMLIB_MAX_PMDS

#define MAX_PMU_NAME_LEN 32

static void fatal_error(char *fmt,...) __attribute__((noreturn));

static void

fatal_error(char *fmt, ...)

{

	va_list ap;

	va_start(ap, fmt);

	vfprintf(stderr, fmt, ap);

	va_end(ap);

	exit(1);

}

/*

 * The goal of this program is to exercise the event assignment

 * code for a specific PMU model. This program is independent of

 * the kernel API.

 */

int

main(int argc, char **argv)

{

	char **p;

	unsigned int i;

	int ret;

	pfmlib_input_param_t inp;

	pfmlib_output_param_t outp;

	pfmlib_options_t pfmlib_options;

	char model[MAX_PMU_NAME_LEN];

	unsigned int num_counters;

	/*

	 * pass options to library (optional)

	 */

	memset(&pfmlib_options, 0, sizeof(pfmlib_options));

	pfmlib_options.pfm_debug   = 0; /* set to 1 for debug */

	pfmlib_options.pfm_verbose = 0; /* set to 1 for verbose */

	pfm_set_options(&pfmlib_options);

	/*

	 * Initialize pfm library (required before we can use it)

	 */

	ret = pfm_initialize();

	if (ret != PFMLIB_SUCCESS)

		fatal_error("Cannot initialize library: %s\n", pfm_strerror(ret));

	pfm_get_pmu_name(model, MAX_PMU_NAME_LEN);

	printf("PMU model: %s\n", model);

	pfm_get_num_counters(&num_counters);

	printf("%u counters available\n", num_counters);

	/*

	 * prepare parameters to library.

	 */

	memset(&inp,0, sizeof(inp));

	memset(&outp,0, sizeof(outp));

	/*

	 * be nice to user!

	 */

	if (argc > 1) {

		p = argv+1;

		for (i=0; *p ; i++, p++) {

			ret = pfm_find_full_event(*p, &inp.pfp_events[i]);

			if (ret != PFMLIB_SUCCESS)

				fatal_error("event %s: %s\n", *p, pfm_strerror(ret));

		}

	} else {

		if (pfm_get_cycle_event(&inp.pfp_events[0]) != PFMLIB_SUCCESS)

			fatal_error("cannot find cycle event\n");

		if (pfm_get_inst_retired_event(&inp.pfp_events[1]) != PFMLIB_SUCCESS)

			fatal_error("cannot find inst retired event\n");

		i = 2;

	}

	/*

	 * set the default privilege mode for all counters:

	 * 	PFM_PLM3 : user level only

	 */

	inp.pfp_dfl_plm   = PFM_PLM3;

	if (i > num_counters) {

		i = num_counters;

		printf("too many events provided (max=%d events), using first %d event(s)\n", num_counters, i);

	}

	/*

	 * how many counters we use

	 */

	inp.pfp_event_count = i;

	/*

	 * let the library figure out the values for the PMCS

	 */

	if ((ret=pfm_dispatch_events(&inp, NULL, &outp, NULL)) != PFMLIB_SUCCESS)

		fatal_error("cannot configure events: %s\n", pfm_strerror(ret));

	for (i=0; i < outp.pfp_pmc_count; i++)

		printf("PMC%u=0x%llx\n",

			outp.pfp_pmcs[i].reg_num,

			outp.pfp_pmcs[i].reg_value);

	for (i=0; i < outp.pfp_pmd_count; i++)

		printf("PMD%u\n", outp.pfp_pmds[i].reg_num);

	return 0;

}