Root/tools/perf/builtin-test.c

1/*
2 * builtin-test.c
3 *
4 * Builtin regression testing command: ever growing number of sanity tests
5 */
6#include "builtin.h"
7
8#include "util/cache.h"
9#include "util/debug.h"
10#include "util/debugfs.h"
11#include "util/evlist.h"
12#include "util/parse-options.h"
13#include "util/parse-events.h"
14#include "util/symbol.h"
15#include "util/thread_map.h"
16#include "util/pmu.h"
17#include "../../include/linux/hw_breakpoint.h"
18
19#include <sys/mman.h>
20
21static int vmlinux_matches_kallsyms_filter(struct map *map __used, struct symbol *sym)
22{
23    bool *visited = symbol__priv(sym);
24    *visited = true;
25    return 0;
26}
27
28static int test__vmlinux_matches_kallsyms(void)
29{
30    int err = -1;
31    struct rb_node *nd;
32    struct symbol *sym;
33    struct map *kallsyms_map, *vmlinux_map;
34    struct machine kallsyms, vmlinux;
35    enum map_type type = MAP__FUNCTION;
36    long page_size = sysconf(_SC_PAGE_SIZE);
37    struct ref_reloc_sym ref_reloc_sym = { .name = "_stext", };
38
39    /*
40     * Step 1:
41     *
42     * Init the machines that will hold kernel, modules obtained from
43     * both vmlinux + .ko files and from /proc/kallsyms split by modules.
44     */
45    machine__init(&kallsyms, "", HOST_KERNEL_ID);
46    machine__init(&vmlinux, "", HOST_KERNEL_ID);
47
48    /*
49     * Step 2:
50     *
51     * Create the kernel maps for kallsyms and the DSO where we will then
52     * load /proc/kallsyms. Also create the modules maps from /proc/modules
53     * and find the .ko files that match them in /lib/modules/`uname -r`/.
54     */
55    if (machine__create_kernel_maps(&kallsyms) < 0) {
56        pr_debug("machine__create_kernel_maps ");
57        return -1;
58    }
59
60    /*
61     * Step 3:
62     *
63     * Load and split /proc/kallsyms into multiple maps, one per module.
64     */
65    if (machine__load_kallsyms(&kallsyms, "/proc/kallsyms", type, NULL) <= 0) {
66        pr_debug("dso__load_kallsyms ");
67        goto out;
68    }
69
70    /*
71     * Step 4:
72     *
73     * kallsyms will be internally on demand sorted by name so that we can
74     * find the reference relocation * symbol, i.e. the symbol we will use
75     * to see if the running kernel was relocated by checking if it has the
76     * same value in the vmlinux file we load.
77     */
78    kallsyms_map = machine__kernel_map(&kallsyms, type);
79
80    sym = map__find_symbol_by_name(kallsyms_map, ref_reloc_sym.name, NULL);
81    if (sym == NULL) {
82        pr_debug("dso__find_symbol_by_name ");
83        goto out;
84    }
85
86    ref_reloc_sym.addr = sym->start;
87
88    /*
89     * Step 5:
90     *
91     * Now repeat step 2, this time for the vmlinux file we'll auto-locate.
92     */
93    if (machine__create_kernel_maps(&vmlinux) < 0) {
94        pr_debug("machine__create_kernel_maps ");
95        goto out;
96    }
97
98    vmlinux_map = machine__kernel_map(&vmlinux, type);
99    map__kmap(vmlinux_map)->ref_reloc_sym = &ref_reloc_sym;
100
101    /*
102     * Step 6:
103     *
104     * Locate a vmlinux file in the vmlinux path that has a buildid that
105     * matches the one of the running kernel.
106     *
107     * While doing that look if we find the ref reloc symbol, if we find it
108     * we'll have its ref_reloc_symbol.unrelocated_addr and then
109     * maps__reloc_vmlinux will notice and set proper ->[un]map_ip routines
110     * to fixup the symbols.
111     */
112    if (machine__load_vmlinux_path(&vmlinux, type,
113                       vmlinux_matches_kallsyms_filter) <= 0) {
114        pr_debug("machine__load_vmlinux_path ");
115        goto out;
116    }
117
118    err = 0;
119    /*
120     * Step 7:
121     *
122     * Now look at the symbols in the vmlinux DSO and check if we find all of them
123     * in the kallsyms dso. For the ones that are in both, check its names and
124     * end addresses too.
125     */
126    for (nd = rb_first(&vmlinux_map->dso->symbols[type]); nd; nd = rb_next(nd)) {
127        struct symbol *pair, *first_pair;
128        bool backwards = true;
129
130        sym = rb_entry(nd, struct symbol, rb_node);
131
132        if (sym->start == sym->end)
133            continue;
134
135        first_pair = machine__find_kernel_symbol(&kallsyms, type, sym->start, NULL, NULL);
136        pair = first_pair;
137
138        if (pair && pair->start == sym->start) {
139next_pair:
140            if (strcmp(sym->name, pair->name) == 0) {
141                /*
142                 * kallsyms don't have the symbol end, so we
143                 * set that by using the next symbol start - 1,
144                 * in some cases we get this up to a page
145                 * wrong, trace_kmalloc when I was developing
146                 * this code was one such example, 2106 bytes
147                 * off the real size. More than that and we
148                 * _really_ have a problem.
149                 */
150                s64 skew = sym->end - pair->end;
151                if (llabs(skew) < page_size)
152                    continue;
153
154                pr_debug("%#" PRIx64 ": diff end addr for %s v: %#" PRIx64 " k: %#" PRIx64 "\n",
155                     sym->start, sym->name, sym->end, pair->end);
156            } else {
157                struct rb_node *nnd;
158detour:
159                nnd = backwards ? rb_prev(&pair->rb_node) :
160                          rb_next(&pair->rb_node);
161                if (nnd) {
162                    struct symbol *next = rb_entry(nnd, struct symbol, rb_node);
163
164                    if (next->start == sym->start) {
165                        pair = next;
166                        goto next_pair;
167                    }
168                }
169
170                if (backwards) {
171                    backwards = false;
172                    pair = first_pair;
173                    goto detour;
174                }
175
176                pr_debug("%#" PRIx64 ": diff name v: %s k: %s\n",
177                     sym->start, sym->name, pair->name);
178            }
179        } else
180            pr_debug("%#" PRIx64 ": %s not on kallsyms\n", sym->start, sym->name);
181
182        err = -1;
183    }
184
185    if (!verbose)
186        goto out;
187
188    pr_info("Maps only in vmlinux:\n");
189
190    for (nd = rb_first(&vmlinux.kmaps.maps[type]); nd; nd = rb_next(nd)) {
191        struct map *pos = rb_entry(nd, struct map, rb_node), *pair;
192        /*
193         * If it is the kernel, kallsyms is always "[kernel.kallsyms]", while
194         * the kernel will have the path for the vmlinux file being used,
195         * so use the short name, less descriptive but the same ("[kernel]" in
196         * both cases.
197         */
198        pair = map_groups__find_by_name(&kallsyms.kmaps, type,
199                        (pos->dso->kernel ?
200                            pos->dso->short_name :
201                            pos->dso->name));
202        if (pair)
203            pair->priv = 1;
204        else
205            map__fprintf(pos, stderr);
206    }
207
208    pr_info("Maps in vmlinux with a different name in kallsyms:\n");
209
210    for (nd = rb_first(&vmlinux.kmaps.maps[type]); nd; nd = rb_next(nd)) {
211        struct map *pos = rb_entry(nd, struct map, rb_node), *pair;
212
213        pair = map_groups__find(&kallsyms.kmaps, type, pos->start);
214        if (pair == NULL || pair->priv)
215            continue;
216
217        if (pair->start == pos->start) {
218            pair->priv = 1;
219            pr_info(" %" PRIx64 "-%" PRIx64 " %" PRIx64 " %s in kallsyms as",
220                pos->start, pos->end, pos->pgoff, pos->dso->name);
221            if (pos->pgoff != pair->pgoff || pos->end != pair->end)
222                pr_info(": \n*%" PRIx64 "-%" PRIx64 " %" PRIx64 "",
223                    pair->start, pair->end, pair->pgoff);
224            pr_info(" %s\n", pair->dso->name);
225            pair->priv = 1;
226        }
227    }
228
229    pr_info("Maps only in kallsyms:\n");
230
231    for (nd = rb_first(&kallsyms.kmaps.maps[type]);
232         nd; nd = rb_next(nd)) {
233        struct map *pos = rb_entry(nd, struct map, rb_node);
234
235        if (!pos->priv)
236            map__fprintf(pos, stderr);
237    }
238out:
239    return err;
240}
241
242#include "util/cpumap.h"
243#include "util/evsel.h"
244#include <sys/types.h>
245
246static int trace_event__id(const char *evname)
247{
248    char *filename;
249    int err = -1, fd;
250
251    if (asprintf(&filename,
252             "%s/syscalls/%s/id",
253             tracing_events_path, evname) < 0)
254        return -1;
255
256    fd = open(filename, O_RDONLY);
257    if (fd >= 0) {
258        char id[16];
259        if (read(fd, id, sizeof(id)) > 0)
260            err = atoi(id);
261        close(fd);
262    }
263
264    free(filename);
265    return err;
266}
267
268static int test__open_syscall_event(void)
269{
270    int err = -1, fd;
271    struct thread_map *threads;
272    struct perf_evsel *evsel;
273    struct perf_event_attr attr;
274    unsigned int nr_open_calls = 111, i;
275    int id = trace_event__id("sys_enter_open");
276
277    if (id < 0) {
278        pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
279        return -1;
280    }
281
282    threads = thread_map__new(-1, getpid(), UINT_MAX);
283    if (threads == NULL) {
284        pr_debug("thread_map__new\n");
285        return -1;
286    }
287
288    memset(&attr, 0, sizeof(attr));
289    attr.type = PERF_TYPE_TRACEPOINT;
290    attr.config = id;
291    evsel = perf_evsel__new(&attr, 0);
292    if (evsel == NULL) {
293        pr_debug("perf_evsel__new\n");
294        goto out_thread_map_delete;
295    }
296
297    if (perf_evsel__open_per_thread(evsel, threads, false, NULL) < 0) {
298        pr_debug("failed to open counter: %s, "
299             "tweak /proc/sys/kernel/perf_event_paranoid?\n",
300             strerror(errno));
301        goto out_evsel_delete;
302    }
303
304    for (i = 0; i < nr_open_calls; ++i) {
305        fd = open("/etc/passwd", O_RDONLY);
306        close(fd);
307    }
308
309    if (perf_evsel__read_on_cpu(evsel, 0, 0) < 0) {
310        pr_debug("perf_evsel__read_on_cpu\n");
311        goto out_close_fd;
312    }
313
314    if (evsel->counts->cpu[0].val != nr_open_calls) {
315        pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls, got %" PRIu64 "\n",
316             nr_open_calls, evsel->counts->cpu[0].val);
317        goto out_close_fd;
318    }
319    
320    err = 0;
321out_close_fd:
322    perf_evsel__close_fd(evsel, 1, threads->nr);
323out_evsel_delete:
324    perf_evsel__delete(evsel);
325out_thread_map_delete:
326    thread_map__delete(threads);
327    return err;
328}
329
330#include <sched.h>
331
332static int test__open_syscall_event_on_all_cpus(void)
333{
334    int err = -1, fd, cpu;
335    struct thread_map *threads;
336    struct cpu_map *cpus;
337    struct perf_evsel *evsel;
338    struct perf_event_attr attr;
339    unsigned int nr_open_calls = 111, i;
340    cpu_set_t cpu_set;
341    int id = trace_event__id("sys_enter_open");
342
343    if (id < 0) {
344        pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
345        return -1;
346    }
347
348    threads = thread_map__new(-1, getpid(), UINT_MAX);
349    if (threads == NULL) {
350        pr_debug("thread_map__new\n");
351        return -1;
352    }
353
354    cpus = cpu_map__new(NULL);
355    if (cpus == NULL) {
356        pr_debug("cpu_map__new\n");
357        goto out_thread_map_delete;
358    }
359
360
361    CPU_ZERO(&cpu_set);
362
363    memset(&attr, 0, sizeof(attr));
364    attr.type = PERF_TYPE_TRACEPOINT;
365    attr.config = id;
366    evsel = perf_evsel__new(&attr, 0);
367    if (evsel == NULL) {
368        pr_debug("perf_evsel__new\n");
369        goto out_thread_map_delete;
370    }
371
372    if (perf_evsel__open(evsel, cpus, threads, false, NULL) < 0) {
373        pr_debug("failed to open counter: %s, "
374             "tweak /proc/sys/kernel/perf_event_paranoid?\n",
375             strerror(errno));
376        goto out_evsel_delete;
377    }
378
379    for (cpu = 0; cpu < cpus->nr; ++cpu) {
380        unsigned int ncalls = nr_open_calls + cpu;
381        /*
382         * XXX eventually lift this restriction in a way that
383         * keeps perf building on older glibc installations
384         * without CPU_ALLOC. 1024 cpus in 2010 still seems
385         * a reasonable upper limit tho :-)
386         */
387        if (cpus->map[cpu] >= CPU_SETSIZE) {
388            pr_debug("Ignoring CPU %d\n", cpus->map[cpu]);
389            continue;
390        }
391
392        CPU_SET(cpus->map[cpu], &cpu_set);
393        if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
394            pr_debug("sched_setaffinity() failed on CPU %d: %s ",
395                 cpus->map[cpu],
396                 strerror(errno));
397            goto out_close_fd;
398        }
399        for (i = 0; i < ncalls; ++i) {
400            fd = open("/etc/passwd", O_RDONLY);
401            close(fd);
402        }
403        CPU_CLR(cpus->map[cpu], &cpu_set);
404    }
405
406    /*
407     * Here we need to explicitely preallocate the counts, as if
408     * we use the auto allocation it will allocate just for 1 cpu,
409     * as we start by cpu 0.
410     */
411    if (perf_evsel__alloc_counts(evsel, cpus->nr) < 0) {
412        pr_debug("perf_evsel__alloc_counts(ncpus=%d)\n", cpus->nr);
413        goto out_close_fd;
414    }
415
416    err = 0;
417
418    for (cpu = 0; cpu < cpus->nr; ++cpu) {
419        unsigned int expected;
420
421        if (cpus->map[cpu] >= CPU_SETSIZE)
422            continue;
423
424        if (perf_evsel__read_on_cpu(evsel, cpu, 0) < 0) {
425            pr_debug("perf_evsel__read_on_cpu\n");
426            err = -1;
427            break;
428        }
429
430        expected = nr_open_calls + cpu;
431        if (evsel->counts->cpu[cpu].val != expected) {
432            pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %" PRIu64 "\n",
433                 expected, cpus->map[cpu], evsel->counts->cpu[cpu].val);
434            err = -1;
435        }
436    }
437
438out_close_fd:
439    perf_evsel__close_fd(evsel, 1, threads->nr);
440out_evsel_delete:
441    perf_evsel__delete(evsel);
442out_thread_map_delete:
443    thread_map__delete(threads);
444    return err;
445}
446
447/*
448 * This test will generate random numbers of calls to some getpid syscalls,
449 * then establish an mmap for a group of events that are created to monitor
450 * the syscalls.
451 *
452 * It will receive the events, using mmap, use its PERF_SAMPLE_ID generated
453 * sample.id field to map back to its respective perf_evsel instance.
454 *
455 * Then it checks if the number of syscalls reported as perf events by
456 * the kernel corresponds to the number of syscalls made.
457 */
458static int test__basic_mmap(void)
459{
460    int err = -1;
461    union perf_event *event;
462    struct thread_map *threads;
463    struct cpu_map *cpus;
464    struct perf_evlist *evlist;
465    struct perf_event_attr attr = {
466        .type = PERF_TYPE_TRACEPOINT,
467        .read_format = PERF_FORMAT_ID,
468        .sample_type = PERF_SAMPLE_ID,
469        .watermark = 0,
470    };
471    cpu_set_t cpu_set;
472    const char *syscall_names[] = { "getsid", "getppid", "getpgrp",
473                    "getpgid", };
474    pid_t (*syscalls[])(void) = { (void *)getsid, getppid, getpgrp,
475                      (void*)getpgid };
476#define nsyscalls ARRAY_SIZE(syscall_names)
477    int ids[nsyscalls];
478    unsigned int nr_events[nsyscalls],
479             expected_nr_events[nsyscalls], i, j;
480    struct perf_evsel *evsels[nsyscalls], *evsel;
481    int sample_size = __perf_evsel__sample_size(attr.sample_type);
482
483    for (i = 0; i < nsyscalls; ++i) {
484        char name[64];
485
486        snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]);
487        ids[i] = trace_event__id(name);
488        if (ids[i] < 0) {
489            pr_debug("Is debugfs mounted on /sys/kernel/debug?\n");
490            return -1;
491        }
492        nr_events[i] = 0;
493        expected_nr_events[i] = random() % 257;
494    }
495
496    threads = thread_map__new(-1, getpid(), UINT_MAX);
497    if (threads == NULL) {
498        pr_debug("thread_map__new\n");
499        return -1;
500    }
501
502    cpus = cpu_map__new(NULL);
503    if (cpus == NULL) {
504        pr_debug("cpu_map__new\n");
505        goto out_free_threads;
506    }
507
508    CPU_ZERO(&cpu_set);
509    CPU_SET(cpus->map[0], &cpu_set);
510    sched_setaffinity(0, sizeof(cpu_set), &cpu_set);
511    if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
512        pr_debug("sched_setaffinity() failed on CPU %d: %s ",
513             cpus->map[0], strerror(errno));
514        goto out_free_cpus;
515    }
516
517    evlist = perf_evlist__new(cpus, threads);
518    if (evlist == NULL) {
519        pr_debug("perf_evlist__new\n");
520        goto out_free_cpus;
521    }
522
523    /* anonymous union fields, can't be initialized above */
524    attr.wakeup_events = 1;
525    attr.sample_period = 1;
526
527    for (i = 0; i < nsyscalls; ++i) {
528        attr.config = ids[i];
529        evsels[i] = perf_evsel__new(&attr, i);
530        if (evsels[i] == NULL) {
531            pr_debug("perf_evsel__new\n");
532            goto out_free_evlist;
533        }
534
535        perf_evlist__add(evlist, evsels[i]);
536
537        if (perf_evsel__open(evsels[i], cpus, threads, false, NULL) < 0) {
538            pr_debug("failed to open counter: %s, "
539                 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
540                 strerror(errno));
541            goto out_close_fd;
542        }
543    }
544
545    if (perf_evlist__mmap(evlist, 128, true) < 0) {
546        pr_debug("failed to mmap events: %d (%s)\n", errno,
547             strerror(errno));
548        goto out_close_fd;
549    }
550
551    for (i = 0; i < nsyscalls; ++i)
552        for (j = 0; j < expected_nr_events[i]; ++j) {
553            int foo = syscalls[i]();
554            ++foo;
555        }
556
557    while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
558        struct perf_sample sample;
559
560        if (event->header.type != PERF_RECORD_SAMPLE) {
561            pr_debug("unexpected %s event\n",
562                 perf_event__name(event->header.type));
563            goto out_munmap;
564        }
565
566        err = perf_event__parse_sample(event, attr.sample_type, sample_size,
567                           false, &sample, false);
568        if (err) {
569            pr_err("Can't parse sample, err = %d\n", err);
570            goto out_munmap;
571        }
572
573        evsel = perf_evlist__id2evsel(evlist, sample.id);
574        if (evsel == NULL) {
575            pr_debug("event with id %" PRIu64
576                 " doesn't map to an evsel\n", sample.id);
577            goto out_munmap;
578        }
579        nr_events[evsel->idx]++;
580    }
581
582    list_for_each_entry(evsel, &evlist->entries, node) {
583        if (nr_events[evsel->idx] != expected_nr_events[evsel->idx]) {
584            pr_debug("expected %d %s events, got %d\n",
585                 expected_nr_events[evsel->idx],
586                 event_name(evsel), nr_events[evsel->idx]);
587            goto out_munmap;
588        }
589    }
590
591    err = 0;
592out_munmap:
593    perf_evlist__munmap(evlist);
594out_close_fd:
595    for (i = 0; i < nsyscalls; ++i)
596        perf_evsel__close_fd(evsels[i], 1, threads->nr);
597out_free_evlist:
598    perf_evlist__delete(evlist);
599out_free_cpus:
600    cpu_map__delete(cpus);
601out_free_threads:
602    thread_map__delete(threads);
603    return err;
604#undef nsyscalls
605}
606
607static int sched__get_first_possible_cpu(pid_t pid, cpu_set_t **maskp,
608                     size_t *sizep)
609{
610    cpu_set_t *mask;
611    size_t size;
612    int i, cpu = -1, nrcpus = 1024;
613realloc:
614    mask = CPU_ALLOC(nrcpus);
615    size = CPU_ALLOC_SIZE(nrcpus);
616    CPU_ZERO_S(size, mask);
617
618    if (sched_getaffinity(pid, size, mask) == -1) {
619        CPU_FREE(mask);
620        if (errno == EINVAL && nrcpus < (1024 << 8)) {
621            nrcpus = nrcpus << 2;
622            goto realloc;
623        }
624        perror("sched_getaffinity");
625            return -1;
626    }
627
628    for (i = 0; i < nrcpus; i++) {
629        if (CPU_ISSET_S(i, size, mask)) {
630            if (cpu == -1) {
631                cpu = i;
632                *maskp = mask;
633                *sizep = size;
634            } else
635                CPU_CLR_S(i, size, mask);
636        }
637    }
638
639    if (cpu == -1)
640        CPU_FREE(mask);
641
642    return cpu;
643}
644
645static int test__PERF_RECORD(void)
646{
647    struct perf_record_opts opts = {
648        .target = {
649            .uid = UINT_MAX,
650            .uses_mmap = true,
651        },
652        .no_delay = true,
653        .freq = 10,
654        .mmap_pages = 256,
655    };
656    cpu_set_t *cpu_mask = NULL;
657    size_t cpu_mask_size = 0;
658    struct perf_evlist *evlist = perf_evlist__new(NULL, NULL);
659    struct perf_evsel *evsel;
660    struct perf_sample sample;
661    const char *cmd = "sleep";
662    const char *argv[] = { cmd, "1", NULL, };
663    char *bname;
664    u64 sample_type, prev_time = 0;
665    bool found_cmd_mmap = false,
666         found_libc_mmap = false,
667         found_vdso_mmap = false,
668         found_ld_mmap = false;
669    int err = -1, errs = 0, i, wakeups = 0, sample_size;
670    u32 cpu;
671    int total_events = 0, nr_events[PERF_RECORD_MAX] = { 0, };
672
673    if (evlist == NULL || argv == NULL) {
674        pr_debug("Not enough memory to create evlist\n");
675        goto out;
676    }
677
678    /*
679     * We need at least one evsel in the evlist, use the default
680     * one: "cycles".
681     */
682    err = perf_evlist__add_default(evlist);
683    if (err < 0) {
684        pr_debug("Not enough memory to create evsel\n");
685        goto out_delete_evlist;
686    }
687
688    /*
689     * Create maps of threads and cpus to monitor. In this case
690     * we start with all threads and cpus (-1, -1) but then in
691     * perf_evlist__prepare_workload we'll fill in the only thread
692     * we're monitoring, the one forked there.
693     */
694    err = perf_evlist__create_maps(evlist, &opts.target);
695    if (err < 0) {
696        pr_debug("Not enough memory to create thread/cpu maps\n");
697        goto out_delete_evlist;
698    }
699
700    /*
701     * Prepare the workload in argv[] to run, it'll fork it, and then wait
702     * for perf_evlist__start_workload() to exec it. This is done this way
703     * so that we have time to open the evlist (calling sys_perf_event_open
704     * on all the fds) and then mmap them.
705     */
706    err = perf_evlist__prepare_workload(evlist, &opts, argv);
707    if (err < 0) {
708        pr_debug("Couldn't run the workload!\n");
709        goto out_delete_evlist;
710    }
711
712    /*
713     * Config the evsels, setting attr->comm on the first one, etc.
714     */
715    evsel = list_entry(evlist->entries.next, struct perf_evsel, node);
716    evsel->attr.sample_type |= PERF_SAMPLE_CPU;
717    evsel->attr.sample_type |= PERF_SAMPLE_TID;
718    evsel->attr.sample_type |= PERF_SAMPLE_TIME;
719    perf_evlist__config_attrs(evlist, &opts);
720
721    err = sched__get_first_possible_cpu(evlist->workload.pid, &cpu_mask,
722                        &cpu_mask_size);
723    if (err < 0) {
724        pr_debug("sched__get_first_possible_cpu: %s\n", strerror(errno));
725        goto out_delete_evlist;
726    }
727
728    cpu = err;
729
730    /*
731     * So that we can check perf_sample.cpu on all the samples.
732     */
733    if (sched_setaffinity(evlist->workload.pid, cpu_mask_size, cpu_mask) < 0) {
734        pr_debug("sched_setaffinity: %s\n", strerror(errno));
735        goto out_free_cpu_mask;
736    }
737
738    /*
739     * Call sys_perf_event_open on all the fds on all the evsels,
740     * grouping them if asked to.
741     */
742    err = perf_evlist__open(evlist, opts.group);
743    if (err < 0) {
744        pr_debug("perf_evlist__open: %s\n", strerror(errno));
745        goto out_delete_evlist;
746    }
747
748    /*
749     * mmap the first fd on a given CPU and ask for events for the other
750     * fds in the same CPU to be injected in the same mmap ring buffer
751     * (using ioctl(PERF_EVENT_IOC_SET_OUTPUT)).
752     */
753    err = perf_evlist__mmap(evlist, opts.mmap_pages, false);
754    if (err < 0) {
755        pr_debug("perf_evlist__mmap: %s\n", strerror(errno));
756        goto out_delete_evlist;
757    }
758
759    /*
760     * We'll need these two to parse the PERF_SAMPLE_* fields in each
761     * event.
762     */
763    sample_type = perf_evlist__sample_type(evlist);
764    sample_size = __perf_evsel__sample_size(sample_type);
765
766    /*
767     * Now that all is properly set up, enable the events, they will
768     * count just on workload.pid, which will start...
769     */
770    perf_evlist__enable(evlist);
771
772    /*
773     * Now!
774     */
775    perf_evlist__start_workload(evlist);
776
777    while (1) {
778        int before = total_events;
779
780        for (i = 0; i < evlist->nr_mmaps; i++) {
781            union perf_event *event;
782
783            while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
784                const u32 type = event->header.type;
785                const char *name = perf_event__name(type);
786
787                ++total_events;
788                if (type < PERF_RECORD_MAX)
789                    nr_events[type]++;
790
791                err = perf_event__parse_sample(event, sample_type,
792                                   sample_size, true,
793                                   &sample, false);
794                if (err < 0) {
795                    if (verbose)
796                        perf_event__fprintf(event, stderr);
797                    pr_debug("Couldn't parse sample\n");
798                    goto out_err;
799                }
800
801                if (verbose) {
802                    pr_info("%" PRIu64" %d ", sample.time, sample.cpu);
803                    perf_event__fprintf(event, stderr);
804                }
805
806                if (prev_time > sample.time) {
807                    pr_debug("%s going backwards in time, prev=%" PRIu64 ", curr=%" PRIu64 "\n",
808                         name, prev_time, sample.time);
809                    ++errs;
810                }
811
812                prev_time = sample.time;
813
814                if (sample.cpu != cpu) {
815                    pr_debug("%s with unexpected cpu, expected %d, got %d\n",
816                         name, cpu, sample.cpu);
817                    ++errs;
818                }
819
820                if ((pid_t)sample.pid != evlist->workload.pid) {
821                    pr_debug("%s with unexpected pid, expected %d, got %d\n",
822                         name, evlist->workload.pid, sample.pid);
823                    ++errs;
824                }
825
826                if ((pid_t)sample.tid != evlist->workload.pid) {
827                    pr_debug("%s with unexpected tid, expected %d, got %d\n",
828                         name, evlist->workload.pid, sample.tid);
829                    ++errs;
830                }
831
832                if ((type == PERF_RECORD_COMM ||
833                     type == PERF_RECORD_MMAP ||
834                     type == PERF_RECORD_FORK ||
835                     type == PERF_RECORD_EXIT) &&
836                     (pid_t)event->comm.pid != evlist->workload.pid) {
837                    pr_debug("%s with unexpected pid/tid\n", name);
838                    ++errs;
839                }
840
841                if ((type == PERF_RECORD_COMM ||
842                     type == PERF_RECORD_MMAP) &&
843                     event->comm.pid != event->comm.tid) {
844                    pr_debug("%s with different pid/tid!\n", name);
845                    ++errs;
846                }
847
848                switch (type) {
849                case PERF_RECORD_COMM:
850                    if (strcmp(event->comm.comm, cmd)) {
851                        pr_debug("%s with unexpected comm!\n", name);
852                        ++errs;
853                    }
854                    break;
855                case PERF_RECORD_EXIT:
856                    goto found_exit;
857                case PERF_RECORD_MMAP:
858                    bname = strrchr(event->mmap.filename, '/');
859                    if (bname != NULL) {
860                        if (!found_cmd_mmap)
861                            found_cmd_mmap = !strcmp(bname + 1, cmd);
862                        if (!found_libc_mmap)
863                            found_libc_mmap = !strncmp(bname + 1, "libc", 4);
864                        if (!found_ld_mmap)
865                            found_ld_mmap = !strncmp(bname + 1, "ld", 2);
866                    } else if (!found_vdso_mmap)
867                        found_vdso_mmap = !strcmp(event->mmap.filename, "[vdso]");
868                    break;
869
870                case PERF_RECORD_SAMPLE:
871                    /* Just ignore samples for now */
872                    break;
873                default:
874                    pr_debug("Unexpected perf_event->header.type %d!\n",
875                         type);
876                    ++errs;
877                }
878            }
879        }
880
881        /*
882         * We don't use poll here because at least at 3.1 times the
883         * PERF_RECORD_{!SAMPLE} events don't honour
884         * perf_event_attr.wakeup_events, just PERF_EVENT_SAMPLE does.
885         */
886        if (total_events == before && false)
887            poll(evlist->pollfd, evlist->nr_fds, -1);
888
889        sleep(1);
890        if (++wakeups > 5) {
891            pr_debug("No PERF_RECORD_EXIT event!\n");
892            break;
893        }
894    }
895
896found_exit:
897    if (nr_events[PERF_RECORD_COMM] > 1) {
898        pr_debug("Excessive number of PERF_RECORD_COMM events!\n");
899        ++errs;
900    }
901
902    if (nr_events[PERF_RECORD_COMM] == 0) {
903        pr_debug("Missing PERF_RECORD_COMM for %s!\n", cmd);
904        ++errs;
905    }
906
907    if (!found_cmd_mmap) {
908        pr_debug("PERF_RECORD_MMAP for %s missing!\n", cmd);
909        ++errs;
910    }
911
912    if (!found_libc_mmap) {
913        pr_debug("PERF_RECORD_MMAP for %s missing!\n", "libc");
914        ++errs;
915    }
916
917    if (!found_ld_mmap) {
918        pr_debug("PERF_RECORD_MMAP for %s missing!\n", "ld");
919        ++errs;
920    }
921
922    if (!found_vdso_mmap) {
923        pr_debug("PERF_RECORD_MMAP for %s missing!\n", "[vdso]");
924        ++errs;
925    }
926out_err:
927    perf_evlist__munmap(evlist);
928out_free_cpu_mask:
929    CPU_FREE(cpu_mask);
930out_delete_evlist:
931    perf_evlist__delete(evlist);
932out:
933    return (err < 0 || errs > 0) ? -1 : 0;
934}
935
936
937#if defined(__x86_64__) || defined(__i386__)
938
939#define barrier() asm volatile("" ::: "memory")
940
941static u64 rdpmc(unsigned int counter)
942{
943    unsigned int low, high;
944
945    asm volatile("rdpmc" : "=a" (low), "=d" (high) : "c" (counter));
946
947    return low | ((u64)high) << 32;
948}
949
950static u64 rdtsc(void)
951{
952    unsigned int low, high;
953
954    asm volatile("rdtsc" : "=a" (low), "=d" (high));
955
956    return low | ((u64)high) << 32;
957}
958
959static u64 mmap_read_self(void *addr)
960{
961    struct perf_event_mmap_page *pc = addr;
962    u32 seq, idx, time_mult = 0, time_shift = 0;
963    u64 count, cyc = 0, time_offset = 0, enabled, running, delta;
964
965    do {
966        seq = pc->lock;
967        barrier();
968
969        enabled = pc->time_enabled;
970        running = pc->time_running;
971
972        if (enabled != running) {
973            cyc = rdtsc();
974            time_mult = pc->time_mult;
975            time_shift = pc->time_shift;
976            time_offset = pc->time_offset;
977        }
978
979        idx = pc->index;
980        count = pc->offset;
981        if (idx)
982            count += rdpmc(idx - 1);
983
984        barrier();
985    } while (pc->lock != seq);
986
987    if (enabled != running) {
988        u64 quot, rem;
989
990        quot = (cyc >> time_shift);
991        rem = cyc & ((1 << time_shift) - 1);
992        delta = time_offset + quot * time_mult +
993            ((rem * time_mult) >> time_shift);
994
995        enabled += delta;
996        if (idx)
997            running += delta;
998
999        quot = count / running;
1000        rem = count % running;
1001        count = quot * enabled + (rem * enabled) / running;
1002    }
1003
1004    return count;
1005}
1006
1007/*
1008 * If the RDPMC instruction faults then signal this back to the test parent task:
1009 */
1010static void segfault_handler(int sig __used, siginfo_t *info __used, void *uc __used)
1011{
1012    exit(-1);
1013}
1014
1015static int __test__rdpmc(void)
1016{
1017    long page_size = sysconf(_SC_PAGE_SIZE);
1018    volatile int tmp = 0;
1019    u64 i, loops = 1000;
1020    int n;
1021    int fd;
1022    void *addr;
1023    struct perf_event_attr attr = {
1024        .type = PERF_TYPE_HARDWARE,
1025        .config = PERF_COUNT_HW_INSTRUCTIONS,
1026        .exclude_kernel = 1,
1027    };
1028    u64 delta_sum = 0;
1029        struct sigaction sa;
1030
1031    sigfillset(&sa.sa_mask);
1032    sa.sa_sigaction = segfault_handler;
1033    sigaction(SIGSEGV, &sa, NULL);
1034
1035    fd = sys_perf_event_open(&attr, 0, -1, -1, 0);
1036    if (fd < 0) {
1037        die("Error: sys_perf_event_open() syscall returned "
1038            "with %d (%s)\n", fd, strerror(errno));
1039    }
1040
1041    addr = mmap(NULL, page_size, PROT_READ, MAP_SHARED, fd, 0);
1042    if (addr == (void *)(-1)) {
1043        die("Error: mmap() syscall returned "
1044            "with (%s)\n", strerror(errno));
1045    }
1046
1047    for (n = 0; n < 6; n++) {
1048        u64 stamp, now, delta;
1049
1050        stamp = mmap_read_self(addr);
1051
1052        for (i = 0; i < loops; i++)
1053            tmp++;
1054
1055        now = mmap_read_self(addr);
1056        loops *= 10;
1057
1058        delta = now - stamp;
1059        pr_debug("%14d: %14Lu\n", n, (long long)delta);
1060
1061        delta_sum += delta;
1062    }
1063
1064    munmap(addr, page_size);
1065    close(fd);
1066
1067    pr_debug(" ");
1068
1069    if (!delta_sum)
1070        return -1;
1071
1072    return 0;
1073}
1074
1075static int test__rdpmc(void)
1076{
1077    int status = 0;
1078    int wret = 0;
1079    int ret;
1080    int pid;
1081
1082    pid = fork();
1083    if (pid < 0)
1084        return -1;
1085
1086    if (!pid) {
1087        ret = __test__rdpmc();
1088
1089        exit(ret);
1090    }
1091
1092    wret = waitpid(pid, &status, 0);
1093    if (wret < 0 || status)
1094        return -1;
1095
1096    return 0;
1097}
1098
1099#endif
1100
1101static int test__perf_pmu(void)
1102{
1103    return perf_pmu__test();
1104}
1105
1106static struct test {
1107    const char *desc;
1108    int (*func)(void);
1109} tests[] = {
1110    {
1111        .desc = "vmlinux symtab matches kallsyms",
1112        .func = test__vmlinux_matches_kallsyms,
1113    },
1114    {
1115        .desc = "detect open syscall event",
1116        .func = test__open_syscall_event,
1117    },
1118    {
1119        .desc = "detect open syscall event on all cpus",
1120        .func = test__open_syscall_event_on_all_cpus,
1121    },
1122    {
1123        .desc = "read samples using the mmap interface",
1124        .func = test__basic_mmap,
1125    },
1126    {
1127        .desc = "parse events tests",
1128        .func = parse_events__test,
1129    },
1130#if defined(__x86_64__) || defined(__i386__)
1131    {
1132        .desc = "x86 rdpmc test",
1133        .func = test__rdpmc,
1134    },
1135#endif
1136    {
1137        .desc = "Validate PERF_RECORD_* events & perf_sample fields",
1138        .func = test__PERF_RECORD,
1139    },
1140    {
1141        .desc = "Test perf pmu format parsing",
1142        .func = test__perf_pmu,
1143    },
1144    {
1145        .func = NULL,
1146    },
1147};
1148
1149static bool perf_test__matches(int curr, int argc, const char *argv[])
1150{
1151    int i;
1152
1153    if (argc == 0)
1154        return true;
1155
1156    for (i = 0; i < argc; ++i) {
1157        char *end;
1158        long nr = strtoul(argv[i], &end, 10);
1159
1160        if (*end == '\0') {
1161            if (nr == curr + 1)
1162                return true;
1163            continue;
1164        }
1165
1166        if (strstr(tests[curr].desc, argv[i]))
1167            return true;
1168    }
1169
1170    return false;
1171}
1172
1173static int __cmd_test(int argc, const char *argv[])
1174{
1175    int i = 0;
1176
1177    while (tests[i].func) {
1178        int curr = i++, err;
1179
1180        if (!perf_test__matches(curr, argc, argv))
1181            continue;
1182
1183        pr_info("%2d: %s:", i, tests[curr].desc);
1184        pr_debug("\n--- start ---\n");
1185        err = tests[curr].func();
1186        pr_debug("---- end ----\n%s:", tests[curr].desc);
1187        pr_info(" %s\n", err ? "FAILED!\n" : "Ok");
1188    }
1189
1190    return 0;
1191}
1192
1193static int perf_test__list(int argc, const char **argv)
1194{
1195    int i = 0;
1196
1197    while (tests[i].func) {
1198        int curr = i++;
1199
1200        if (argc > 1 && !strstr(tests[curr].desc, argv[1]))
1201            continue;
1202
1203        pr_info("%2d: %s\n", i, tests[curr].desc);
1204    }
1205
1206    return 0;
1207}
1208
1209int cmd_test(int argc, const char **argv, const char *prefix __used)
1210{
1211    const char * const test_usage[] = {
1212    "perf test [<options>] [{list <test-name-fragment>|[<test-name-fragments>|<test-numbers>]}]",
1213    NULL,
1214    };
1215    const struct option test_options[] = {
1216    OPT_INCR('v', "verbose", &verbose,
1217            "be more verbose (show symbol address, etc)"),
1218    OPT_END()
1219    };
1220
1221    argc = parse_options(argc, argv, test_options, test_usage, 0);
1222    if (argc >= 1 && !strcmp(argv[0], "list"))
1223        return perf_test__list(argc, argv);
1224
1225    symbol_conf.priv_size = sizeof(int);
1226    symbol_conf.sort_by_name = true;
1227    symbol_conf.try_vmlinux_path = true;
1228
1229    if (symbol__init() < 0)
1230        return -1;
1231
1232    return __cmd_test(argc, argv);
1233}
1234

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