/*
* pfmlib_amd64_perf_event.c : perf_event AMD64 functions
*
* Copyright (c) 2011 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.
*/
#include <sys/types.h>
#include <string.h>
#include <stdlib.h>
#include <limits.h>
/* private headers */
#include "pfmlib_priv.h" /* library private */
#include "pfmlib_amd64_priv.h" /* architecture private */
#include "pfmlib_perf_event_priv.h"
static int
find_pmu_type_by_name(const char *name)
{
char filename[PATH_MAX];
FILE *fp;
int ret, type;
if (!name)
return PFM_ERR_NOTSUPP;
sprintf(filename, "/sys/bus/event_source/devices/%s/type", name);
fp = fopen(filename, "r");
if (!fp)
return PFM_ERR_NOTSUPP;
ret = fscanf(fp, "%d", &type);
if (ret != 1)
type = PFM_ERR_NOTSUPP;
fclose(fp);
return type;
}
int
pfm_amd64_get_perf_encoding(void *this, pfmlib_event_desc_t *e)
{
pfmlib_pmu_t *pmu = this;
struct perf_event_attr *attr = e->os_data;
int ret;
if (!pmu->get_event_encoding[PFM_OS_NONE])
return PFM_ERR_NOTSUPP;
/*
* use generic raw encoding function first
*/
ret = pmu->get_event_encoding[PFM_OS_NONE](this, e);
if (ret != PFM_SUCCESS)
return ret;
if (e->count > 1) {
DPRINT("%s: unsupported count=%d\n", e->count);
return PFM_ERR_NOTSUPP;
}
ret = PERF_TYPE_RAW;
/*
* if specific perf PMU is provided then try to locate it
* otherwise assume core PMU and thus type RAW
*/
if (pmu->perf_name) {
/* greab PMU type from sysfs */
ret = find_pmu_type_by_name(pmu->perf_name);
if (ret < 0)
return ret;
}
DPRINT("amd64_get_perf_encoding: PMU type=%d\n", ret);
attr->type = ret;
attr->config = e->codes[0];
return PFM_SUCCESS;
}
void
pfm_amd64_perf_validate_pattrs(void *this, pfmlib_event_desc_t *e)
{
pfmlib_pmu_t *pmu = this;
int i, compact;
for (i=0; i < e->npattrs; i++) {
compact = 0;
/* umasks never conflict */
if (e->pattrs[i].type == PFM_ATTR_UMASK)
continue;
/*
* with perf_events, u and k are handled at the OS level
* via attr.exclude_* fields
*/
if (e->pattrs[i].ctrl == PFM_ATTR_CTRL_PMU) {
if (e->pattrs[i].idx == AMD64_ATTR_U
|| e->pattrs[i].idx == AMD64_ATTR_K
|| e->pattrs[i].idx == AMD64_ATTR_H)
compact = 1;
}
if (e->pattrs[i].ctrl == PFM_ATTR_CTRL_PERF_EVENT) {
/* No precise mode on AMD */
if (e->pattrs[i].idx == PERF_ATTR_PR)
compact = 1;
/* older processors do not support hypervisor priv level */
if (!IS_FAMILY_10H(pmu) && e->pattrs[i].idx == PERF_ATTR_H)
compact = 1;
}
if (compact) {
pfmlib_compact_pattrs(e, i);
i--;
}
}
}
void
pfm_amd64_nb_perf_validate_pattrs(void *this, pfmlib_event_desc_t *e)
{
int i, compact;
for (i=0; i < e->npattrs; i++) {
compact = 0;
/* umasks never conflict */
if (e->pattrs[i].type == PFM_ATTR_UMASK)
continue;
/*
* no perf_events attr is supported by AMD64 Northbridge PMU
* sampling is not supported
*/
if (e->pattrs[i].ctrl == PFM_ATTR_CTRL_PERF_EVENT) {
compact = 1;
}
if (compact) {
pfmlib_compact_pattrs(e, i);
i--;
}
}
}