// SPDX-License-Identifier: GPL-2.0#include <sys/time.h>#include <sys/prctl.h>#include <errno.h>#include <limits.h>#include <time.h>#include <stdlib.h>#include <linux/zalloc.h>#include <linux/err.h>#include <perf/cpumap.h>#include <perf/evlist.h>#include <perf/mmap.h> #include "debug.h"#include "parse-events.h"#include "evlist.h"#include "evsel.h"#include "thread_map.h"#include "record.h"#include "tests.h"#include "util/mmap.h"#include "util/sample.h"#include "pmus.h" static int spin_sleep(void){	struct timeval start, now, diff, maxtime;	struct timespec ts;	int err, i; 	maxtime.tv_sec = 0;	maxtime.tv_usec = 50000; 	err = gettimeofday(&start, NULL);	if (err)		return err; 	/* Spin for 50ms */	while (1) {		for (i = 0; i < 1000; i++)			barrier(); 		err = gettimeofday(&now, NULL);		if (err)			return err; 		timersub(&now, &start, &diff);		if (timercmp(&diff, &maxtime, > /* For checkpatch */))			break;	} 	ts.tv_nsec = 50 * 1000 * 1000;	ts.tv_sec = 0; 	/* Sleep for 50ms */	err = nanosleep(&ts, NULL);	if (err == EINTR)		err = 0; 	return err;} struct switch_tracking {	struct evsel *switch_evsel;	struct evsel *cycles_evsel;	pid_t *tids;	int nr_tids;	int comm_seen[4];	int cycles_before_comm_1;	int cycles_between_comm_2_and_comm_3;	int cycles_after_comm_4;}; static int check_comm(struct switch_tracking *switch_tracking,		      union perf_event *event, const char *comm, int nr){	if (event->header.type == PERF_RECORD_COMM &&	    (pid_t)event->comm.pid == getpid() &&	    (pid_t)event->comm.tid == getpid() &&	    strcmp(event->comm.comm, comm) == 0) {		if (switch_tracking->comm_seen[nr]) {			pr_debug("Duplicate comm event\n");			return -1;		}		switch_tracking->comm_seen[nr] = 1;		pr_debug3("comm event: %s nr: %d\n", event->comm.comm, nr);		return 1;	}	return 0;} static int check_cpu(struct switch_tracking *switch_tracking, int cpu){	int i, nr = cpu + 1; 	if (cpu < 0)		return -1; 	if (!switch_tracking->tids) {		switch_tracking->tids = calloc(nr, sizeof(pid_t));		if (!switch_tracking->tids)			return -1;		for (i = 0; i < nr; i++)			switch_tracking->tids[i] = -1;		switch_tracking->nr_tids = nr;		return 0;	} 	if (cpu >= switch_tracking->nr_tids) {		void *addr; 		addr = realloc(switch_tracking->tids, nr * sizeof(pid_t));		if (!addr)			return -1;		switch_tracking->tids = addr;		for (i = switch_tracking->nr_tids; i < nr; i++)			switch_tracking->tids[i] = -1;		switch_tracking->nr_tids = nr;		return 0;	} 	return 0;} static int process_sample_event(struct evlist *evlist,				union perf_event *event,				struct switch_tracking *switch_tracking){	struct perf_sample sample;	struct evsel *evsel;	pid_t next_tid, prev_tid;	int cpu, err; 	perf_sample__init(&sample, /*all=*/false);	if (evlist__parse_sample(evlist, event, &sample)) {		pr_debug("evlist__parse_sample failed\n");		err = -1;		goto out;	} 	evsel = sample.evsel;	if (!evsel)		evsel = evlist__id2evsel(evlist, sample.id); 	if (evsel == switch_tracking->switch_evsel) {		next_tid = perf_sample__intval(&sample, "next_pid");		prev_tid = perf_sample__intval(&sample, "prev_pid");		cpu = sample.cpu;		pr_debug3("sched_switch: cpu: %d prev_tid %d next_tid %d\n",			  cpu, prev_tid, next_tid);		err = check_cpu(switch_tracking, cpu);		if (err)			goto out;		/*		 * Check for no missing sched_switch events i.e. that the		 * evsel->core.system_wide flag has worked.		 */		if (switch_tracking->tids[cpu] != -1 &&		    switch_tracking->tids[cpu] != prev_tid) {			pr_debug("Missing sched_switch events\n");			err = -1;			goto out;		}		switch_tracking->tids[cpu] = next_tid;	} 	if (evsel == switch_tracking->cycles_evsel) {		pr_debug3("cycles event\n");		if (!switch_tracking->comm_seen[0])			switch_tracking->cycles_before_comm_1 = 1;		if (switch_tracking->comm_seen[1] &&		    !switch_tracking->comm_seen[2])			switch_tracking->cycles_between_comm_2_and_comm_3 = 1;		if (switch_tracking->comm_seen[3])			switch_tracking->cycles_after_comm_4 = 1;	} 	err = 0;out:	perf_sample__exit(&sample);	return err;} static int process_event(struct evlist *evlist, union perf_event *event,			 struct switch_tracking *switch_tracking){	if (event->header.type == PERF_RECORD_SAMPLE)		return process_sample_event(evlist, event, switch_tracking); 	if (event->header.type == PERF_RECORD_COMM) {		int err, done = 0; 		err = check_comm(switch_tracking, event, "Test COMM 1", 0);		if (err < 0)			return -1;		done += err;		err = check_comm(switch_tracking, event, "Test COMM 2", 1);		if (err < 0)			return -1;		done += err;		err = check_comm(switch_tracking, event, "Test COMM 3", 2);		if (err < 0)			return -1;		done += err;		err = check_comm(switch_tracking, event, "Test COMM 4", 3);		if (err < 0)			return -1;		done += err;		if (done != 1) {			pr_debug("Unexpected comm event\n");			return -1;		}	} 	return 0;} struct event_node {	struct list_head list;	union perf_event *event;	u64 event_time;}; static int add_event(struct evlist *evlist, struct list_head *events,		     union perf_event *event){	struct perf_sample sample;	struct event_node *node; 	node = malloc(sizeof(struct event_node));	if (!node) {		pr_debug("malloc failed\n");		return -1;	}	node->event = event;	list_add(&node->list, events); 	if (evlist__parse_sample(evlist, event, &sample)) {		pr_debug("evlist__parse_sample failed\n");		perf_sample__exit(&sample);		return -1;	} 	if (!sample.time) {		pr_debug("event with no time\n");		perf_sample__exit(&sample);		return -1;	} 	node->event_time = sample.time; 	perf_sample__exit(&sample);	return 0;} static void free_event_nodes(struct list_head *events){	struct event_node *node; 	while (!list_empty(events)) {		node = list_entry(events->next, struct event_node, list);		list_del_init(&node->list);		free(node);	}} static int compar(const void *a, const void *b){	const struct event_node *nodea = a;	const struct event_node *nodeb = b;	s64 cmp = nodea->event_time - nodeb->event_time; 	return cmp < 0 ? -1 : (cmp > 0 ? 1 : 0);} static int process_events(struct evlist *evlist,			  struct switch_tracking *switch_tracking){	union perf_event *event;	unsigned pos, cnt = 0;	LIST_HEAD(events);	struct event_node *events_array, *node;	struct mmap *md;	int i, ret; 	for (i = 0; i < evlist__core(evlist)->nr_mmaps; i++) {		md = &evlist__mmap(evlist)[i];		if (perf_mmap__read_init(&md->core) < 0)			continue; 		while ((event = perf_mmap__read_event(&md->core)) != NULL) {			cnt += 1;			ret = add_event(evlist, &events, event);			 perf_mmap__consume(&md->core);			if (ret < 0)				goto out_free_nodes;		}		perf_mmap__read_done(&md->core);	} 	events_array = calloc(cnt, sizeof(struct event_node));	if (!events_array) {		pr_debug("calloc failed\n");		ret = -1;		goto out_free_nodes;	} 	pos = 0;	list_for_each_entry(node, &events, list)		events_array[pos++] = *node; 	qsort(events_array, cnt, sizeof(struct event_node), compar); 	for (pos = 0; pos < cnt; pos++) {		ret = process_event(evlist, events_array[pos].event,				    switch_tracking);		if (ret < 0)			goto out_free;	} 	ret = 0;out_free:	pr_debug("%u events recorded\n", cnt);	free(events_array);out_free_nodes:	free_event_nodes(&events);	return ret;} /** * test__switch_tracking - test using sched_switch and tracking events. * * This function implements a test that checks that sched_switch events and * tracking events can be recorded for a workload (current process) using the * evsel->core.system_wide and evsel->tracking flags (respectively) with other events * sometimes enabled or disabled. */static int test__switch_tracking(struct test_suite *test __maybe_unused, int subtest __maybe_unused){	const char *sched_switch = "sched:sched_switch";	const char *cycles = "cpu-cycles:u";	struct switch_tracking switch_tracking = { .tids = NULL, };	struct record_opts opts = {		.mmap_pages	     = UINT_MAX,		.user_freq	     = UINT_MAX,		.user_interval	     = ULLONG_MAX,		.freq		     = 4000,		.target		     = {			.uses_mmap   = true,		},	};	struct perf_thread_map *threads = NULL;	struct perf_cpu_map *cpus = NULL;	struct evlist *evlist = NULL;	struct evsel *evsel, *cpu_clocks_evsel, *cycles_evsel;	struct evsel *switch_evsel, *tracking_evsel;	const char *comm;	int err = -1; 	threads = thread_map__new_by_tid(getpid());	if (!threads) {		pr_debug("thread_map__new failed!\n");		goto out_err;	} 	cpus = perf_cpu_map__new_online_cpus();	if (!cpus) {		pr_debug("perf_cpu_map__new failed!\n");		goto out_err;	} 	evlist = evlist__new();	if (!evlist) {		pr_debug("evlist__new failed!\n");		goto out_err;	} 	perf_evlist__set_maps(evlist__core(evlist), cpus, threads); 	/* First event */	err = parse_event(evlist, "cpu-clock:u");	if (err) {		pr_debug("Failed to parse event dummy:u\n");		goto out_err;	} 	cpu_clocks_evsel = evlist__last(evlist); 	/* Second event */	err = parse_event(evlist, cycles);	if (err) {		pr_debug("Failed to parse event %s\n", cycles);		goto out_err;	} 	cycles_evsel = evlist__last(evlist); 	/* Third event */	if (!evlist__can_select_event(evlist, sched_switch)) {		pr_debug("No sched_switch\n");		err = 0;		goto out;	} 	switch_evsel = evlist__add_sched_switch(evlist, true);	if (IS_ERR(switch_evsel)) {		err = PTR_ERR(switch_evsel);		pr_debug("Failed to create event %s\n", sched_switch);		goto out_err;	} 	switch_evsel->immediate = true; 	/* Test moving an event to the front */	if (cycles_evsel == evlist__first(evlist)) {		pr_debug("cycles event already at front");		goto out_err;	}	evlist__to_front(evlist, cycles_evsel);	if (cycles_evsel != evlist__first(evlist)) {		pr_debug("Failed to move cycles event to front");		goto out_err;	} 	evsel__set_sample_bit(cycles_evsel, CPU);	evsel__set_sample_bit(cycles_evsel, TIME); 	/* Fourth event */	err = parse_event(evlist, "dummy:u");	if (err) {		pr_debug("Failed to parse event dummy:u\n");		goto out_err;	} 	tracking_evsel = evlist__last(evlist); 	evlist__set_tracking_event(evlist, tracking_evsel); 	tracking_evsel->core.attr.freq = 0;	tracking_evsel->core.attr.sample_period = 1; 	evsel__set_sample_bit(tracking_evsel, TIME); 	/* Config events */	evlist__config(evlist, &opts, NULL); 	/* Check moved event is still at the front */	if (cycles_evsel != evlist__first(evlist)) {		pr_debug("Front event no longer at front");		goto out_err;	} 	/* Check tracking event is tracking */	if (!tracking_evsel->core.attr.mmap || !tracking_evsel->core.attr.comm) {		pr_debug("Tracking event not tracking\n");		goto out_err;	} 	/* Check non-tracking events are not tracking */	evlist__for_each_entry(evlist, evsel) {		if (evsel != tracking_evsel) {			if (evsel->core.attr.mmap || evsel->core.attr.comm) {				pr_debug("Non-tracking event is tracking\n");				goto out_err;			}		}	} 	if (evlist__open(evlist) < 0) {		pr_debug("Not supported\n");		err = 0;		goto out;	} 	err = evlist__do_mmap(evlist, UINT_MAX);	if (err) {		pr_debug("evlist__mmap failed!\n");		goto out_err;	} 	evlist__enable(evlist); 	err = evsel__disable(cpu_clocks_evsel);	if (err) {		pr_debug("perf_evlist__disable_event failed!\n");		goto out_err;	} 	err = spin_sleep();	if (err) {		pr_debug("spin_sleep failed!\n");		goto out_err;	} 	comm = "Test COMM 1";	err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);	if (err) {		pr_debug("PR_SET_NAME failed!\n");		goto out_err;	}

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