system/freebsd-src
system/freebsd-src
1
0
Fork 0
mirror of https://github.com/freebsd/freebsd-src synced 2024-07-22 10:48:02 +00:00
Code Issues Actions 2 Packages Projects Releases Wiki Activity

arm64 hwpmc: Support restricting counters to user or kernel mode.

Browse source 
Support the "usr" and "os" qualifiers on arm64 events to restrict
event counting to either usermode or the kernel, respectively.  If
neither qualifier is given, events are counted in both.

Reviewed by:	emaste
Sponsored by:	University of Cambridge, Google, Inc.
Differential Revision:	https://reviews.freebsd.org/D34527
This commit is contained in:
John Baldwin 2022-03-11 11:29:45 -08:00
parent 456d57a66d
commit 6bb7ba4aa1
2 changed files with 29 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

17
lib/libpmc/libpmc.c
View file

@ -763,13 +763,20 @@ static struct pmc_event_alias cortex_a57_aliases[] = {
static struct pmc_event_alias cortex_a76_aliases[] = {
EV_ALIAS(NULL, NULL)
};
static int
arm64_allocate_pmc(enum pmc_event pe, char *ctrspec __unused,
struct pmc_op_pmcallocate *pmc_config __unused)
arm64_allocate_pmc(enum pmc_event pe, char *ctrspec,
struct pmc_op_pmcallocate *pmc_config)
{
switch (pe) {
default:
break;
char *p;
while ((p = strsep(&ctrspec, ",")) != NULL) {
if (KWMATCH(p, "os"))
pmc_config->pm_caps |= PMC_CAP_SYSTEM;
else if (KWMATCH(p, "usr"))
pmc_config->pm_caps |= PMC_CAP_USER;
else
return (-1);
}
return (0);

17
sys/dev/hwpmc/hwpmc_arm64.c
View file

@ -187,6 +187,23 @@ arm64_allocate_pmc(int cpu, int ri, struct pmc *pm,
if (config > (PMC_EV_ARMV8_LAST - PMC_EV_ARMV8_FIRST))
return (EINVAL);
}
switch (a->pm_caps & (PMC_CAP_SYSTEM | PMC_CAP_USER)) {
case PMC_CAP_SYSTEM:
config |= PMEVTYPER_U;
break;
case PMC_CAP_USER:
config |= PMEVTYPER_P;
break;
default:
/*
* Trace both USER and SYSTEM if none are specified
* (default setting) or if both flags are specified
* (user explicitly requested both qualifiers).
*/
break;
}
pm->pm_md.pm_arm64.pm_arm64_evsel = config;
PMCDBG2(MDP, ALL, 2, "arm64-allocate ri=%d -> config=0x%x", ri, config);