/*

 * detect_pmu_regs.c - detect unavailable PMD/PMC registers based on perfmon3 information

 *

 * Copyright (c) 2006-2007 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.

 *

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

 * applications on Linux.

 */

#include <sys/types.h>

#include <stdio.h>

#include <stdlib.h>

#include <errno.h>

#include <string.h>

#include <unistd.h>

#include <perfmon/perfmon.h>

#include <perfmon/pfmlib.h>

int

get_sif(int flags, pfarg_sinfo_t *sif)

{

	int fd;

	/* initialize as all available */

	if (sif) {

		memset(sif->sif_avail_pmcs, 0xff, sizeof(sif->sif_avail_pmcs));

		memset(sif->sif_avail_pmds, 0xff, sizeof(sif->sif_avail_pmds));

	}

	fd = pfm_create(flags, sif);

	if (fd > -1)

		close(fd);

	return fd > -1 ? 0 : -1;

}

/*

 * The goal of this function is to help pfm_dispatch_events()

 * in situations where not all PMC/PMD registers are available.

 *

 * It builds bitmasks of *unavailable* PMC/PMD registers from the

 * information returned by pfm_create_session().

 *

 * arguments:

 * 	sif: pfarg_sinfo_t pointer

 * 	r_pmcs: a bitmask for PMC availability, NULL if not needed

 * 	r_pmcs: a bitmask for PMD availability, NULL if not needed

 */

void

detect_unavail_pmu_regs(pfarg_sinfo_t *sif, pfmlib_regmask_t *r_pmcs, pfmlib_regmask_t *r_pmds)

{

	int i, j, max;

	if (r_pmcs) {

		memset(r_pmcs, 0, sizeof(*r_pmcs));

		max = PFMLIB_REG_BV < PFM_PMC_BV ? PFMLIB_REG_BV : PFM_PMC_BV;

		for(i=0; i < max; i++) {

			for(j=0; j < 64; j++) {

				if ((sif->sif_avail_pmcs[i] & (1ULL << j)) == 0)

					pfm_regmask_set(r_pmcs, (i<<6)+j);

			}

		}

	}

	if (r_pmds) {

		memset(r_pmds, 0, sizeof(*r_pmds));

		max = PFMLIB_REG_BV < PFM_PMD_BV ? PFMLIB_REG_BV : PFM_PMD_BV;

		for(i=0; i < max; i++) {

			for(j=0; j < 64; j++) {

				if ((sif->sif_avail_pmds[i] & (1ULL << j)) == 0)

					pfm_regmask_set(r_pmds, (i<<6)+j);

			}

		}

	}

}