// SPDX-License-Identifier: GPL-2.0#include <linux/types.h>#include <limits.h>#include <unistd.h>#include <sys/prctl.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 "record.h"#include "thread_map.h"#include "tests.h"#include "util/mmap.h" #define CHECK__(x) {				\	while ((x) < 0) {			\		pr_debug(#x " failed!\n");	\		goto out_err;			\	}					\} #define CHECK_NOT_NULL__(x) {			\	while ((x) == NULL) {			\		pr_debug(#x " failed!\n");	\		goto out_err;			\	}					\} static int find_comm(struct evlist *evlist, const char *comm){	union perf_event *event;	struct mmap *md;	int i, found; 	found = 0;	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) {			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)				found += 1;			perf_mmap__consume(&md->core);		}		perf_mmap__read_done(&md->core);	}	return found;} /** * test__keep_tracking - test using a dummy software event to keep tracking. * * This function implements a test that checks that tracking events continue * when an event is disabled but a dummy software event is not disabled.  If the * test passes %0 is returned, otherwise %-1 is returned. */static int test__keep_tracking(struct test_suite *test __maybe_unused, int subtest __maybe_unused){	struct record_opts opts = {		.mmap_pages	     = UINT_MAX,		.user_freq	     = UINT_MAX,		.user_interval	     = ULLONG_MAX,		.target		     = {			.uses_mmap   = true,		},	};	struct perf_thread_map *threads = NULL;	struct perf_cpu_map *cpus = NULL;	struct evlist *evlist = NULL;	struct evsel *evsel = NULL;	int found, err = -1;	const char *comm; 	threads = thread_map__new_by_tid(getpid());	CHECK_NOT_NULL__(threads); 	cpus = perf_cpu_map__new_online_cpus();	CHECK_NOT_NULL__(cpus); 	evlist = evlist__new();	CHECK_NOT_NULL__(evlist); 	perf_evlist__set_maps(evlist__core(evlist), cpus, threads); 	CHECK__(parse_event(evlist, "dummy:u"));	CHECK__(parse_event(evlist, "cpu-cycles:u")); 	evlist__config(evlist, &opts, NULL); 	evsel = evlist__first(evlist); 	evsel->core.attr.comm = 1;	evsel->core.attr.disabled = 1;	evsel->core.attr.enable_on_exec = 0; 	if (evlist__open(evlist) < 0) {		pr_debug("Unable to open dummy and cycles event\n");		err = TEST_SKIP;		goto out_err;	} 	CHECK__(evlist__do_mmap(evlist, UINT_MAX)); 	/*	 * First, test that a 'comm' event can be found when the event is	 * enabled.	 */ 	evlist__enable(evlist); 	comm = "Test COMM 1";	CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0)); 	evlist__disable(evlist); 	found = find_comm(evlist, comm);	if (found != 1) {		pr_debug("First time, failed to find tracking event.\n");		goto out_err;	} 	/*	 * Secondly, test that a 'comm' event can be found when the event is	 * disabled with the dummy event still enabled.	 */ 	evlist__enable(evlist); 	evsel = evlist__last(evlist); 	CHECK__(evsel__disable(evsel)); 	comm = "Test COMM 2";	CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0)); 	evlist__disable(evlist); 	found = find_comm(evlist, comm);	if (found != 1) {		pr_debug("Second time, failed to find tracking event.\n");		goto out_err;	} 	err = 0; out_err:	if (evlist) {		evlist__disable(evlist);		evlist__put(evlist);	}	perf_cpu_map__put(cpus);	perf_thread_map__put(threads); 	return err;} DEFINE_SUITE("Use a dummy software event to keep tracking", keep_tracking);