static int __event(bool is_x, void *addr, struct perf_event_attr *attr)
{
int fd;
memset(attr, 0, sizeof(struct perf_event_attr));
attr->type = PERF_TYPE_BREAKPOINT;
attr->size = sizeof(struct perf_event_attr);
attr->config = 0;
attr->bp_type = is_x ? HW_BREAKPOINT_X : HW_BREAKPOINT_W;
attr->bp_addr = (unsigned long) addr;
attr->bp_len = sizeof(long);
attr->sample_period = 1;
attr->sample_type = PERF_SAMPLE_IP;
attr->exclude_kernel = 1;
attr->exclude_hv = 1;
fd = sys_perf_event_open(attr, -1, 0, -1,
perf_event_open_cloexec_flag());
if (fd < 0) {
pr_debug("failed opening event %llx\n", attr->config);
return TEST_FAIL;
}
return fd;
}
static int self_open_counters(struct perf_sched *sched, unsigned long cur_task)
{
struct perf_event_attr attr;
char sbuf[STRERR_BUFSIZE], info[STRERR_BUFSIZE];
int fd;
struct rlimit limit;
bool need_privilege = false;
memset(&attr, 0, sizeof(attr));
attr.type = PERF_TYPE_SOFTWARE;
attr.config = PERF_COUNT_SW_TASK_CLOCK;
force_again:
fd = sys_perf_event_open(&attr, 0, -1, -1,
perf_event_open_cloexec_flag());
if (fd < 0) {
if (errno == EMFILE) {
if (sched->force) {
BUG_ON(getrlimit(RLIMIT_NOFILE, &limit) == -1);
limit.rlim_cur += sched->nr_tasks - cur_task;
if (limit.rlim_cur > limit.rlim_max) {
limit.rlim_max = limit.rlim_cur;
need_privilege = true;
}
if (setrlimit(RLIMIT_NOFILE, &limit) == -1) {
if (need_privilege && errno == EPERM)
strcpy(info, "Need privilege\n");
} else
goto force_again;
} else
strcpy(info, "Have a try with -f option\n");
}
pr_err("Error: sys_perf_event_open() syscall returned "
"with %d (%s)\n%s", fd,
strerror_r(errno, sbuf, sizeof(sbuf)), info);
exit(EXIT_FAILURE);
}
return fd;
}
/*
* Create an event group that contains both a sampled hardware
* (cpu-cycles) and software (intel_cqm/llc_occupancy/) event. We then
* wait for the hardware perf counter to overflow and generate a PMI,
* which triggers an event read for both of the events in the group.
*
* Since reading Intel CQM event counters requires sending SMP IPIs, the
* CQM pmu needs to handle the above situation gracefully, and return
* the last read counter value to avoid triggering a WARN_ON_ONCE() in
* smp_call_function_many() caused by sending IPIs from NMI context.
*/
int test__intel_cqm_count_nmi_context(int subtest __maybe_unused)
{
struct perf_evlist *evlist = NULL;
struct perf_evsel *evsel = NULL;
struct perf_event_attr pe;
int i, fd[2], flag, ret;
size_t mmap_len;
void *event;
pid_t pid;
int err = TEST_FAIL;
flag = perf_event_open_cloexec_flag();
evlist = perf_evlist__new();
if (!evlist) {
pr_debug("perf_evlist__new failed\n");
return TEST_FAIL;
}
ret = parse_events(evlist, "intel_cqm/llc_occupancy/", NULL);
if (ret) {
pr_debug("parse_events failed, is \"intel_cqm/llc_occupancy/\" available?\n");
err = TEST_SKIP;
goto out;
}
evsel = perf_evlist__first(evlist);
if (!evsel) {
pr_debug("perf_evlist__first failed\n");
goto out;
}
memset(&pe, 0, sizeof(pe));
pe.size = sizeof(pe);
pe.type = PERF_TYPE_HARDWARE;
pe.config = PERF_COUNT_HW_CPU_CYCLES;
pe.read_format = PERF_FORMAT_GROUP;
pe.sample_period = 128;
pe.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_READ;
pid = spawn();
fd[0] = sys_perf_event_open(&pe, pid, -1, -1, flag);
if (fd[0] < 0) {
pr_debug("failed to open event\n");
goto out;
}
memset(&pe, 0, sizeof(pe));
pe.size = sizeof(pe);
pe.type = evsel->attr.type;
pe.config = evsel->attr.config;
fd[1] = sys_perf_event_open(&pe, pid, -1, fd[0], flag);
if (fd[1] < 0) {
pr_debug("failed to open event\n");
goto out;
}
/*
* Pick a power-of-two number of pages + 1 for the meta-data
* page (struct perf_event_mmap_page). See tools/perf/design.txt.
*/
mmap_len = page_size * 65;
event = mmap(NULL, mmap_len, PROT_READ, MAP_SHARED, fd[0], 0);
if (event == (void *)(-1)) {
pr_debug("failed to mmap %d\n", errno);
goto out;
}
sleep(1);
err = TEST_OK;
munmap(event, mmap_len);
for (i = 0; i < 2; i++)
close(fd[i]);
kill(pid, SIGKILL);
wait(NULL);
out:
perf_evlist__delete(evlist);
return err;
}
* CQM pmu needs to handle the above situation gracefully, and return
* the last read counter value to avoid triggering a WARN_ON_ONCE() in
* smp_call_function_many() caused by sending IPIs from NMI context.
*/
int test__intel_cqm_count_nmi_context(struct test *test __maybe_unused, int subtest __maybe_unused)
{
struct perf_evlist *evlist = NULL;
struct perf_evsel *evsel = NULL;
struct perf_event_attr pe;
int i, fd[2], flag, ret;
size_t mmap_len;
void *event;
pid_t pid;
int err = TEST_FAIL;
flag = perf_event_open_cloexec_flag();
evlist = perf_evlist__new();
if (!evlist) {
pr_debug("perf_evlist__new failed\n");
return TEST_FAIL;
}
ret = parse_events(evlist, "intel_cqm/llc_occupancy/", NULL);
if (ret) {
pr_debug("parse_events failed, is \"intel_cqm/llc_occupancy/\" available?\n");
err = TEST_SKIP;
goto out;
}
evsel = perf_evlist__first(evlist);
