129 lines
3.6 KiB
C
129 lines
3.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2018, Matthew Macy
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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#include <sys/types.h>
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#include <sys/errno.h>
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#include <sys/sysctl.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <string.h>
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#include <pmc.h>
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#include <pmclog.h>
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#include <libpmcstat.h>
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#include "pmu-events/pmu-events.h"
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#if defined(__amd64__)
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struct pmu_event_desc {
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uint32_t ped_umask;
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uint32_t ped_event;
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uint64_t ped_period;
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};
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static const struct pmu_events_map *
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pmu_events_map_get(void)
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{
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size_t s;
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char buf[64];
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const struct pmu_events_map *pme;
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if (sysctlbyname("kern.hwpmc.cpuid", (void *)NULL, &s,
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(void *)NULL, 0) == -1)
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return (NULL);
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if (sysctlbyname("kern.hwpmc.cpuid", buf, &s,
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(void *)NULL, 0) == -1)
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return (NULL);
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for (pme = pmu_events_map; pme->cpuid != NULL; pme++)
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if (strcmp(buf, pme->cpuid) == 0)
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return (pme);
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return (NULL);
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}
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static const struct pmu_event *
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pmu_event_get(const char *event_name)
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{
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const struct pmu_events_map *pme;
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const struct pmu_event *pe;
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if ((pme = pmu_events_map_get()) == NULL)
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return (NULL);
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for (pe = pme->table; pe->name != NULL; pe++)
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if (strcmp(pe->name, event_name) == 0)
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return (pe);
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return (NULL);
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}
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static int
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pmu_parse_event(struct pmu_event_desc *ped, const char *eventin)
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{
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char *event;
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char *kvp, *key, *value;
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if ((event = strdup(eventin)) == NULL)
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return (ENOMEM);
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bzero(ped, sizeof(*ped));
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while ((kvp = strsep(&event, ",")) != NULL) {
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key = strsep(&kvp, "=");
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if (key == NULL)
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abort();
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value = kvp;
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if (strcmp(key, "umask") == 0)
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ped->ped_umask = strtol(value, NULL, 16);
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if (strcmp(key, "event") == 0)
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ped->ped_event = strtol(value, NULL, 16);
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if (strcmp(key, "period") == 0)
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ped->ped_umask = strtol(value, NULL, 10);
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}
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free(event);
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return (0);
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}
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uint64_t
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pmcstat_pmu_sample_rate_get(const char *event_name)
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{
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const struct pmu_event *pe;
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struct pmu_event_desc ped;
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if ((pe = pmu_event_get(event_name)) == NULL)
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return (DEFAULT_SAMPLE_COUNT);
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if (pe->alias && (pe = pmu_event_get(pe->alias)) == NULL)
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return (DEFAULT_SAMPLE_COUNT);
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if (pe->event == NULL)
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return (DEFAULT_SAMPLE_COUNT);
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if (pmu_parse_event(&ped, pe->event))
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return (DEFAULT_SAMPLE_COUNT);
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return (ped.ped_period);
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}
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#else
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uint64_t pmcstat_pmu_sample_rate_get(void) { return (DEFAULT_SAMPLE_COUNT); }
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#endif
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