/*
* pfmlib_arm.c : support for ARM chips
*
* Copyright (c) 2010 University of Tennessee
* Contributed by Vince Weaver <vweaver1@utk.edu>
*
* 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 <stdio.h>
#include <stdarg.h>
/* private headers */
#include "pfmlib_priv.h" /* library private */
#include "pfmlib_arm_priv.h"
const pfmlib_attr_desc_t arm_mods[]={
PFM_ATTR_B("k", "monitor at kernel level"),
PFM_ATTR_B("u", "monitor at user level"),
PFM_ATTR_B("hv", "monitor in hypervisor"),
PFM_ATTR_NULL /* end-marker to avoid exporting number of entries */
};
pfm_arm_config_t pfm_arm_cfg;
#ifdef CONFIG_PFMLIB_OS_LINUX
/*
* helper function to retrieve one value from /proc/cpuinfo
* for internal libpfm use only
* attr: the attribute (line) to look for
* ret_buf: a buffer to store the value of the attribute (as a string)
* maxlen : number of bytes of capacity in ret_buf
*
* ret_buf is null terminated.
*
* Return:
* 0 : attribute found, ret_buf populated
* -1: attribute not found
*/
static int
pfmlib_getcpuinfo_attr(const char *attr, char *ret_buf, size_t maxlen)
{
FILE *fp = NULL;
int ret = -1;
size_t attr_len, buf_len = 0;
char *p, *value = NULL;
char *buffer = NULL;
if (attr == NULL || ret_buf == NULL || maxlen < 1)
return -1;
attr_len = strlen(attr);
fp = fopen("/proc/cpuinfo", "r");
if (fp == NULL)
return -1;
while(pfmlib_getl(&buffer, &buf_len, fp) != -1){
/* skip blank lines */
if (*buffer == '\n')
continue;
p = strchr(buffer, ':');
if (p == NULL)
goto error;
/*
* p+2: +1 = space, +2= firt character
* strlen()-1 gets rid of \n
*/
*p = '\0';
value = p+2;
value[strlen(value)-1] = '\0';
if (!strncmp(attr, buffer, attr_len))
break;
}
strncpy(ret_buf, value, maxlen-1);
ret_buf[maxlen-1] = '\0';
ret = 0;
error:
free(buffer);
fclose(fp);
return ret;
}
#else
static int
pfmlib_getcpuinfo_attr(const char *attr, char *ret_buf, size_t maxlen)
{
return -1;
}
#endif
static int
arm_num_mods(void *this, int idx)
{
const arm_entry_t *pe = this_pe(this);
unsigned int mask;
mask = pe[idx].modmsk;
return pfmlib_popcnt(mask);
}
static inline int
arm_attr2mod(void *this, int pidx, int attr_idx)
{
const arm_entry_t *pe = this_pe(this);
size_t x;
int n;
n = attr_idx;
pfmlib_for_each_bit(x, pe[pidx].modmsk) {
if (n == 0)
break;
n--;
}
return x;
}
static void
pfm_arm_display_reg(void *this, pfmlib_event_desc_t *e, pfm_arm_reg_t reg)
{
__pfm_vbprintf("[0x%x] %s\n", reg.val, e->fstr);
}
int
pfm_arm_detect(void *this)
{
int ret;
char buffer[128];
ret = pfmlib_getcpuinfo_attr("CPU implementer", buffer, sizeof(buffer));
if (ret == -1)
return PFM_ERR_NOTSUPP;
pfm_arm_cfg.implementer = strtol(buffer, NULL, 16);
ret = pfmlib_getcpuinfo_attr("CPU part", buffer, sizeof(buffer));
if (ret == -1)
return PFM_ERR_NOTSUPP;
pfm_arm_cfg.part = strtol(buffer, NULL, 16);
ret = pfmlib_getcpuinfo_attr("CPU architecture", buffer, sizeof(buffer));
if (ret == -1)
return PFM_ERR_NOTSUPP;
pfm_arm_cfg.architecture = strtol(buffer, NULL, 16);
return PFM_SUCCESS;
}
int
pfm_arm_get_encoding(void *this, pfmlib_event_desc_t *e)
{
const arm_entry_t *pe = this_pe(this);
pfmlib_event_attr_info_t *a;
pfm_arm_reg_t reg;
unsigned int plm = 0;
int i, idx, has_plm = 0;
reg.val = pe[e->event].code;
for (i = 0; i < e->nattrs; i++) {
a = attr(e, i);
if (a->ctrl != PFM_ATTR_CTRL_PMU)
continue;
if (a->type > PFM_ATTR_UMASK) {
uint64_t ival = e->attrs[i].ival;
switch(a->idx) {
case ARM_ATTR_U: /* USR */
if (ival)
plm |= PFM_PLM3;
has_plm = 1;
break;
case ARM_ATTR_K: /* OS */
if (ival)
plm |= PFM_PLM0;
has_plm = 1;
break;
case ARM_ATTR_HV: /* HYPERVISOR */
if (ival)
plm |= PFM_PLMH;
has_plm = 1;
break;
default:
return PFM_ERR_ATTR;
}
}
}
if (arm_has_plm(this, e)) {
if (!has_plm)
plm = e->dfl_plm;
reg.evtsel.excl_pl1 = !(plm & PFM_PLM0);
reg.evtsel.excl_usr = !(plm & PFM_PLM3);
reg.evtsel.excl_hyp = !(plm & PFM_PLMH);
}
evt_strcat(e->fstr, "%s", pe[e->event].name);
e->codes[0] = reg.val;
e->count = 1;
for (i = 0; i < e->npattrs; i++) {
if (e->pattrs[i].ctrl != PFM_ATTR_CTRL_PMU)
continue;
if (e->pattrs[i].type == PFM_ATTR_UMASK)
continue;
idx = e->pattrs[i].idx;
switch(idx) {
case ARM_ATTR_K:
evt_strcat(e->fstr, ":%s=%lu", arm_mods[idx].name, !reg.evtsel.excl_pl1);
break;
case ARM_ATTR_U:
evt_strcat(e->fstr, ":%s=%lu", arm_mods[idx].name, !reg.evtsel.excl_usr);
break;
case ARM_ATTR_HV:
evt_strcat(e->fstr, ":%s=%lu", arm_mods[idx].name, !reg.evtsel.excl_hyp);
break;
}
}
pfm_arm_display_reg(this, e, reg);
return PFM_SUCCESS;
}
int
pfm_arm_get_event_first(void *this)
{
return 0;
}
int
pfm_arm_get_event_next(void *this, int idx)
{
pfmlib_pmu_t *p = this;
if (idx >= (p->pme_count-1))
return -1;
return idx+1;
}
int
pfm_arm_event_is_valid(void *this, int pidx)
{
pfmlib_pmu_t *p = this;
return pidx >= 0 && pidx < p->pme_count;
}
int
pfm_arm_validate_table(void *this, FILE *fp)
{
pfmlib_pmu_t *pmu = this;
const arm_entry_t *pe = this_pe(this);
int i, error = 0;
for(i=0; i < pmu->pme_count; i++) {
if (!pe[i].name) {
fprintf(fp, "pmu: %s event%d: :: no name (prev event was %s)\n", pmu->name, i,
i > 1 ? pe[i-1].name : "??");
error++;
}
if (!pe[i].desc) {
fprintf(fp, "pmu: %s event%d: %s :: no description\n", pmu->name, i, pe[i].name);
error++;
}
}
return error ? PFM_ERR_INVAL : PFM_SUCCESS;
}
int
pfm_arm_get_event_attr_info(void *this, int pidx, int attr_idx, pfmlib_event_attr_info_t *info)
{
int idx;
idx = arm_attr2mod(this, pidx, attr_idx);
info->name = arm_mods[idx].name;
info->desc = arm_mods[idx].desc;
info->type = arm_mods[idx].type;
info->code = idx;
info->is_dfl = 0;
info->equiv = NULL;
info->ctrl = PFM_ATTR_CTRL_PMU;
info->idx = idx; /* namespace specific index */
info->dfl_val64 = 0;
info->is_precise = 0;
return PFM_SUCCESS;
}
unsigned int
pfm_arm_get_event_nattrs(void *this, int pidx)
{
return arm_num_mods(this, pidx);
}
int
pfm_arm_get_event_info(void *this, int idx, pfm_event_info_t *info)
{
pfmlib_pmu_t *pmu = this;
const arm_entry_t *pe = this_pe(this);
info->name = pe[idx].name;
info->desc = pe[idx].desc;
info->code = pe[idx].code;
info->equiv = NULL;
info->idx = idx; /* private index */
info->pmu = pmu->pmu;
info->is_precise = 0;
/* no attributes defined for ARM yet */
info->nattrs = 0;
return PFM_SUCCESS;
}