1#include <stdio.h>
  2#include <sys/types.h>
  3#include <unistd.h>
  4#include <inttypes.h>
  5#include <sys/prctl.h>
  6
  7#include "parse-events.h"
  8#include "evlist.h"
  9#include "evsel.h"
 10#include "thread_map.h"
 11#include "cpumap.h"
 12#include "tests.h"
 13
 14#include "../arch/x86/util/tsc.h"
 15
 16#define CHECK__(x) {				\
 17	while ((x) < 0) {			\
 18		pr_debug(#x " failed!\n");	\
 19		goto out_err;			\
 20	}					\
 21}
 22
 23#define CHECK_NOT_NULL__(x) {			\
 24	while ((x) == NULL) {			\
 25		pr_debug(#x " failed!\n");	\
 26		goto out_err;			\
 27	}					\
 28}
 29
 30static u64 rdtsc(void)
 31{
 32	unsigned int low, high;
 33
 34	asm volatile("rdtsc" : "=a" (low), "=d" (high));
 35
 36	return low | ((u64)high) << 32;
 37}
 38
 39/**
 40 * test__perf_time_to_tsc - test converting perf time to TSC.
 41 *
 42 * This function implements a test that checks that the conversion of perf time
 43 * to and from TSC is consistent with the order of events.  If the test passes
 44 * %0 is returned, otherwise %-1 is returned.  If TSC conversion is not
 45 * supported then then the test passes but " (not supported)" is printed.
 46 */
 47int test__perf_time_to_tsc(void)
 48{
 49	struct record_opts opts = {
 50		.mmap_pages	     = UINT_MAX,
 51		.user_freq	     = UINT_MAX,
 52		.user_interval	     = ULLONG_MAX,
 53		.freq		     = 4000,
 54		.target		     = {
 55			.uses_mmap   = true,
 56		},
 57		.sample_time	     = true,
 58	};
 59	struct thread_map *threads = NULL;
 60	struct cpu_map *cpus = NULL;
 61	struct perf_evlist *evlist = NULL;
 62	struct perf_evsel *evsel = NULL;
 63	int err = -1, ret, i;
 64	const char *comm1, *comm2;
 65	struct perf_tsc_conversion tc;
 66	struct perf_event_mmap_page *pc;
 67	union perf_event *event;
 68	u64 test_tsc, comm1_tsc, comm2_tsc;
 69	u64 test_time, comm1_time = 0, comm2_time = 0;
 70
 71	threads = thread_map__new(-1, getpid(), UINT_MAX);
 72	CHECK_NOT_NULL__(threads);
 73
 74	cpus = cpu_map__new(NULL);
 75	CHECK_NOT_NULL__(cpus);
 76
 77	evlist = perf_evlist__new();
 78	CHECK_NOT_NULL__(evlist);
 79
 80	perf_evlist__set_maps(evlist, cpus, threads);
 81
 82	CHECK__(parse_events(evlist, "cycles:u"));
 83
 84	perf_evlist__config(evlist, &opts);
 85
 86	evsel = perf_evlist__first(evlist);
 87
 88	evsel->attr.comm = 1;
 89	evsel->attr.disabled = 1;
 90	evsel->attr.enable_on_exec = 0;
 91
 92	CHECK__(perf_evlist__open(evlist));
 93
 94	CHECK__(perf_evlist__mmap(evlist, UINT_MAX, false));
 95
 96	pc = evlist->mmap[0].base;
 97	ret = perf_read_tsc_conversion(pc, &tc);
 98	if (ret) {
 99		if (ret == -EOPNOTSUPP) {
100			fprintf(stderr, " (not supported)");
101			return 0;
102		}
103		goto out_err;
104	}
105
106	perf_evlist__enable(evlist);
107
108	comm1 = "Test COMM 1";
109	CHECK__(prctl(PR_SET_NAME, (unsigned long)comm1, 0, 0, 0));
110
111	test_tsc = rdtsc();
112
113	comm2 = "Test COMM 2";
114	CHECK__(prctl(PR_SET_NAME, (unsigned long)comm2, 0, 0, 0));
115
116	perf_evlist__disable(evlist);
117
118	for (i = 0; i < evlist->nr_mmaps; i++) {
119		while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
120			struct perf_sample sample;
121
122			if (event->header.type != PERF_RECORD_COMM ||
123			    (pid_t)event->comm.pid != getpid() ||
124			    (pid_t)event->comm.tid != getpid())
125				goto next_event;
126
127			if (strcmp(event->comm.comm, comm1) == 0) {
128				CHECK__(perf_evsel__parse_sample(evsel, event,
129								 &sample));
130				comm1_time = sample.time;
131			}
132			if (strcmp(event->comm.comm, comm2) == 0) {
133				CHECK__(perf_evsel__parse_sample(evsel, event,
134								 &sample));
135				comm2_time = sample.time;
136			}
137next_event:
138			perf_evlist__mmap_consume(evlist, i);
139		}
140	}
141
142	if (!comm1_time || !comm2_time)
143		goto out_err;
144
145	test_time = tsc_to_perf_time(test_tsc, &tc);
146	comm1_tsc = perf_time_to_tsc(comm1_time, &tc);
147	comm2_tsc = perf_time_to_tsc(comm2_time, &tc);
148
149	pr_debug("1st event perf time %"PRIu64" tsc %"PRIu64"\n",
150		 comm1_time, comm1_tsc);
151	pr_debug("rdtsc          time %"PRIu64" tsc %"PRIu64"\n",
152		 test_time, test_tsc);
153	pr_debug("2nd event perf time %"PRIu64" tsc %"PRIu64"\n",
154		 comm2_time, comm2_tsc);
155
156	if (test_time <= comm1_time ||
157	    test_time >= comm2_time)
158		goto out_err;
159
160	if (test_tsc <= comm1_tsc ||
161	    test_tsc >= comm2_tsc)
162		goto out_err;
163
164	err = 0;
165
166out_err:
167	if (evlist) {
168		perf_evlist__disable(evlist);
169		perf_evlist__delete(evlist);
170	}
171
172	return err;
173}