/*

 * syst_multi_np.c - simple system-wide counting no thread

 *

 * Copyright (c) 2009 Google, Inc

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

 *

 * Based on:

 * Copyright (c) 2002-2006 Hewlett-Packard Development Company, L.P.

 * Contributed by Stephane Eranian <eranian@hpl.hp.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 <inttypes.h>

#include <stdio.h>

#include <stdlib.h>

#include <stdarg.h>

#include <errno.h>

#include <unistd.h>

#include <string.h>

#include <err.h>

#include <perfmon/pfmlib.h>

#include <perfmon/perfmon.h>

#include "detect_pmcs.h"

#define NUM_PMCS PFMLIB_MAX_PMCS

#define NUM_PMDS PFMLIB_MAX_PMDS

#define MAX_EVT_NAME_LEN	128

int

main(int argc, char **argv)

{

	char **p;

	pfarg_pmc_t pc[NUM_PMCS];

	pfarg_pmd_t pd[NUM_PMDS];

	pfarg_ctx_t ctx[1];

	pfarg_load_t load_args;

	pfmlib_input_param_t inp;

	pfmlib_output_param_t outp;

	pfmlib_options_t pfmlib_options;

	uint64_t *pdo;

	int *fds;

	int ret, i;

	unsigned int l;

	long n, ncpus;

	unsigned int num_counters;

	char name[MAX_EVT_NAME_LEN];

	/*

	 * pass options to library (optional)

	 */

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

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

	pfm_set_options(&pfmlib_options);

	/*

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

	 */

	ret = pfm_initialize();

	if (ret != PFMLIB_SUCCESS)

		errx(1, "Cannot initialize library: %s", pfm_strerror(ret));

	pfm_get_num_counters(&num_counters);

	memset(pc, 0, sizeof(pc));

	memset(pd, 0, sizeof(pd));

	memset(ctx, 0, sizeof(ctx));

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

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

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

	/*

	 * be nice to user!

	 */

	if (argc > 1) {

		p = argv+1;

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

			if (pfm_find_full_event(*p, &inp.pfp_events[i]) != PFMLIB_SUCCESS)

				errx(1, "cannot find %s event", *p);

		}

	} else {

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

			errx(1, "cannot find cycle event");

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

			errx(1, "cannot find inst retired event");

		i = 2;

	}

	/*

	 * set the privilege mode:

	 * 	PFM_PLM3 : user   level

	 * 	PFM_PLM0 : kernel level

	 */

	inp.pfp_dfl_plm   = PFM_PLM3|PFM_PLM0;

	if (i > num_counters) {

		i = num_counters;

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

	}

	/*

	 * how many counters we use

	 */

	inp.pfp_event_count = i;

	/*

	 * indicate we are using the monitors for a system-wide session.

	 * This may impact the way the library sets up the PMC values.

	 */

	inp.pfp_flags = PFMLIB_PFP_SYSTEMWIDE;

	/*

	 * In system wide mode, the perfmon context cannot be inherited.

	 * Also in this mode, we cannot use the blocking form of user level notification.

	 */

	ctx[0].ctx_flags = PFM_FL_SYSTEM_WIDE;

	/*

	 * build the pfp_unavail_pmcs bitmask by looking

	 * at what perfmon has available. It is not always

	 * the case that all PMU registers are actually available

	 * to applications. For instance, on IA-32 platforms, some

	 * registers may be reserved for the NMI watchdog timer.

	 *

	 * With this bitmap, the library knows which registers NOT to

	 * use. Of source, it is possible that no valid assignement may

	 * be possible if certina PMU registers  are not available.

	 */

	detect_unavail_pmcs(-1, &inp.pfp_unavail_pmcs);

	/*

	 * let the library figure out the values for the PMCS

	 */

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

		errx(1, "cannot configure events: %s", pfm_strerror(ret));

	/*

	 * Now prepare the argument to initialize the PMDs and PMCS.

	 * We use pfp_pmc_count to determine the number of PMC to intialize.

	 * We use pfp_pmd_count to determine the number of PMD to initialize.

	 * Some events/features may cause extra PMCs to be used, leading to:

	 * 	- pfp_pmc_count may be >= pfp_event_count

	 * 	- pfp_pmd_count may be >= pfp_event_count

	 */

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

		pc[i].reg_num   = outp.pfp_pmcs[i].reg_num;

		pc[i].reg_value = outp.pfp_pmcs[i].reg_value;

	}

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

		pd[i].reg_num = outp.pfp_pmds[i].reg_num;

	ncpus = sysconf(_SC_NPROCESSORS_ONLN);

	if (ncpus < 1)

		ncpus = 1;

	fds = malloc(ncpus  * sizeof(int));

	if (!fds)

		err(1, "cannot allocate fds");

	pdo = calloc(ncpus * outp.pfp_pmd_count, sizeof(uint64_t));

	if (!pdo)

		err(1, "cannot allocate pdo");

	printf("ncpus=%ld pmd=%d\n", ncpus, outp.pfp_pmd_count);

	/*

 	 * create and load contexts

 	 */

	for(n=0; n < ncpus; n++) {

		fds[n] = pfm_create_context(ctx, NULL, NULL, 0);

		if (fds[n] == -1) {

			if (errno == ENOSYS) {

				errx(1, "your kernel does not have performance monitoring support!\n");

			}

			err(1, "cannot create context");

		}

		if (pfm_write_pmcs(fds[n], pc, outp.pfp_pmc_count))

			err(1, "pfm_write_pmcs error");

		if (pfm_write_pmds(fds[n], pd, outp.pfp_pmd_count))

			err(1, "pfm_write_pmds error");

		load_args.load_pid = n;

		if (pfm_load_context(fds[n], &load_args))

			err(1, "pfm_load_context error");

	}

	/*

 	 * start all

 	 */

	for(n=0; n < ncpus; n++) {

		if (pfm_start(fds[n], NULL) == -1)

			err(1, "pfm_start error");

	}

	for(l=0; l < 20; l++) {

		sleep(1);

		/*

		 * read the results

		 */

		puts("------------------------");

		for(n=0; n < ncpus; n++) {

			if (pfm_read_pmds(fds[n], pd, outp.pfp_pmd_count))

				err(1, "pfm_read_pmds error");

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

				pfm_get_full_event_name(&inp.pfp_events[i], name, MAX_EVT_NAME_LEN);

				printf("CPU%-2ld PMD%-3u %-20"PRIu64" %s\n",

					n,

					pd[i].reg_num,

					pd[i].reg_value - pdo[n*outp.pfp_pmd_count+i],

					name);

				pdo[n*outp.pfp_pmd_count+i] = pd[i].reg_value;

			}

		}

	}

	for(n=0; n < ncpus; n++)

		close(fds[n]);

	free(fds);

	free(pdo);

	return 0;

}