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Arnaldo Carvalho de Melo1c6a8002010-04-29 18:58:32 -03001/*
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/parse-options.h"
11#include "util/session.h"
12#include "util/symbol.h"
13#include "util/thread.h"
14
15static long page_size;
16
17static int vmlinux_matches_kallsyms_filter(struct map *map __used, struct symbol *sym)
18{
19 bool *visited = symbol__priv(sym);
20 *visited = true;
21 return 0;
22}
23
24static int test__vmlinux_matches_kallsyms(void)
25{
26 int err = -1;
27 struct rb_node *nd;
28 struct symbol *sym;
29 struct map *kallsyms_map, *vmlinux_map;
30 struct machine kallsyms, vmlinux;
31 enum map_type type = MAP__FUNCTION;
32 struct ref_reloc_sym ref_reloc_sym = { .name = "_stext", };
33
34 /*
35 * Step 1:
36 *
37 * Init the machines that will hold kernel, modules obtained from
38 * both vmlinux + .ko files and from /proc/kallsyms split by modules.
39 */
40 machine__init(&kallsyms, "", HOST_KERNEL_ID);
41 machine__init(&vmlinux, "", HOST_KERNEL_ID);
42
43 /*
44 * Step 2:
45 *
46 * Create the kernel maps for kallsyms and the DSO where we will then
47 * load /proc/kallsyms. Also create the modules maps from /proc/modules
48 * and find the .ko files that match them in /lib/modules/`uname -r`/.
49 */
50 if (machine__create_kernel_maps(&kallsyms) < 0) {
51 pr_debug("machine__create_kernel_maps ");
52 return -1;
53 }
54
55 /*
56 * Step 3:
57 *
58 * Load and split /proc/kallsyms into multiple maps, one per module.
59 */
60 if (machine__load_kallsyms(&kallsyms, "/proc/kallsyms", type, NULL) <= 0) {
61 pr_debug("dso__load_kallsyms ");
62 goto out;
63 }
64
65 /*
66 * Step 4:
67 *
68 * kallsyms will be internally on demand sorted by name so that we can
69 * find the reference relocation * symbol, i.e. the symbol we will use
70 * to see if the running kernel was relocated by checking if it has the
71 * same value in the vmlinux file we load.
72 */
73 kallsyms_map = machine__kernel_map(&kallsyms, type);
74
75 sym = map__find_symbol_by_name(kallsyms_map, ref_reloc_sym.name, NULL);
76 if (sym == NULL) {
77 pr_debug("dso__find_symbol_by_name ");
78 goto out;
79 }
80
81 ref_reloc_sym.addr = sym->start;
82
83 /*
84 * Step 5:
85 *
86 * Now repeat step 2, this time for the vmlinux file we'll auto-locate.
87 */
88 if (machine__create_kernel_maps(&vmlinux) < 0) {
89 pr_debug("machine__create_kernel_maps ");
90 goto out;
91 }
92
93 vmlinux_map = machine__kernel_map(&vmlinux, type);
94 map__kmap(vmlinux_map)->ref_reloc_sym = &ref_reloc_sym;
95
96 /*
97 * Step 6:
98 *
99 * Locate a vmlinux file in the vmlinux path that has a buildid that
100 * matches the one of the running kernel.
101 *
102 * While doing that look if we find the ref reloc symbol, if we find it
103 * we'll have its ref_reloc_symbol.unrelocated_addr and then
104 * maps__reloc_vmlinux will notice and set proper ->[un]map_ip routines
105 * to fixup the symbols.
106 */
107 if (machine__load_vmlinux_path(&vmlinux, type,
108 vmlinux_matches_kallsyms_filter) <= 0) {
109 pr_debug("machine__load_vmlinux_path ");
110 goto out;
111 }
112
113 err = 0;
114 /*
115 * Step 7:
116 *
117 * Now look at the symbols in the vmlinux DSO and check if we find all of them
118 * in the kallsyms dso. For the ones that are in both, check its names and
119 * end addresses too.
120 */
121 for (nd = rb_first(&vmlinux_map->dso->symbols[type]); nd; nd = rb_next(nd)) {
Arnaldo Carvalho de Melod3678752010-12-21 23:38:37 -0200122 struct symbol *pair, *first_pair;
123 bool backwards = true;
Arnaldo Carvalho de Melo1c6a8002010-04-29 18:58:32 -0300124
125 sym = rb_entry(nd, struct symbol, rb_node);
Arnaldo Carvalho de Melod3678752010-12-21 23:38:37 -0200126
127 if (sym->start == sym->end)
128 continue;
129
130 first_pair = machine__find_kernel_symbol(&kallsyms, type, sym->start, NULL, NULL);
131 pair = first_pair;
Arnaldo Carvalho de Melo1c6a8002010-04-29 18:58:32 -0300132
133 if (pair && pair->start == sym->start) {
134next_pair:
135 if (strcmp(sym->name, pair->name) == 0) {
136 /*
137 * kallsyms don't have the symbol end, so we
138 * set that by using the next symbol start - 1,
139 * in some cases we get this up to a page
140 * wrong, trace_kmalloc when I was developing
141 * this code was one such example, 2106 bytes
142 * off the real size. More than that and we
143 * _really_ have a problem.
144 */
145 s64 skew = sym->end - pair->end;
146 if (llabs(skew) < page_size)
147 continue;
148
149 pr_debug("%#Lx: diff end addr for %s v: %#Lx k: %#Lx\n",
150 sym->start, sym->name, sym->end, pair->end);
151 } else {
Arnaldo Carvalho de Melod3678752010-12-21 23:38:37 -0200152 struct rb_node *nnd;
153detour:
154 nnd = backwards ? rb_prev(&pair->rb_node) :
155 rb_next(&pair->rb_node);
Arnaldo Carvalho de Melo1c6a8002010-04-29 18:58:32 -0300156 if (nnd) {
157 struct symbol *next = rb_entry(nnd, struct symbol, rb_node);
158
159 if (next->start == sym->start) {
160 pair = next;
161 goto next_pair;
162 }
163 }
Arnaldo Carvalho de Melod3678752010-12-21 23:38:37 -0200164
165 if (backwards) {
166 backwards = false;
167 pair = first_pair;
168 goto detour;
169 }
170
Arnaldo Carvalho de Melo1c6a8002010-04-29 18:58:32 -0300171 pr_debug("%#Lx: diff name v: %s k: %s\n",
172 sym->start, sym->name, pair->name);
173 }
174 } else
175 pr_debug("%#Lx: %s not on kallsyms\n", sym->start, sym->name);
176
177 err = -1;
178 }
179
180 if (!verbose)
181 goto out;
182
183 pr_info("Maps only in vmlinux:\n");
184
185 for (nd = rb_first(&vmlinux.kmaps.maps[type]); nd; nd = rb_next(nd)) {
186 struct map *pos = rb_entry(nd, struct map, rb_node), *pair;
187 /*
188 * If it is the kernel, kallsyms is always "[kernel.kallsyms]", while
189 * the kernel will have the path for the vmlinux file being used,
190 * so use the short name, less descriptive but the same ("[kernel]" in
191 * both cases.
192 */
193 pair = map_groups__find_by_name(&kallsyms.kmaps, type,
194 (pos->dso->kernel ?
195 pos->dso->short_name :
196 pos->dso->name));
197 if (pair)
198 pair->priv = 1;
199 else
200 map__fprintf(pos, stderr);
201 }
202
203 pr_info("Maps in vmlinux with a different name in kallsyms:\n");
204
205 for (nd = rb_first(&vmlinux.kmaps.maps[type]); nd; nd = rb_next(nd)) {
206 struct map *pos = rb_entry(nd, struct map, rb_node), *pair;
207
208 pair = map_groups__find(&kallsyms.kmaps, type, pos->start);
209 if (pair == NULL || pair->priv)
210 continue;
211
212 if (pair->start == pos->start) {
213 pair->priv = 1;
214 pr_info(" %Lx-%Lx %Lx %s in kallsyms as",
215 pos->start, pos->end, pos->pgoff, pos->dso->name);
216 if (pos->pgoff != pair->pgoff || pos->end != pair->end)
217 pr_info(": \n*%Lx-%Lx %Lx",
218 pair->start, pair->end, pair->pgoff);
219 pr_info(" %s\n", pair->dso->name);
220 pair->priv = 1;
221 }
222 }
223
224 pr_info("Maps only in kallsyms:\n");
225
226 for (nd = rb_first(&kallsyms.kmaps.maps[type]);
227 nd; nd = rb_next(nd)) {
228 struct map *pos = rb_entry(nd, struct map, rb_node);
229
230 if (!pos->priv)
231 map__fprintf(pos, stderr);
232 }
233out:
234 return err;
235}
236
Arnaldo Carvalho de Melod8548612011-01-04 00:16:20 -0200237#include "util/evsel.h"
238#include <sys/types.h>
239
240static int trace_event__id(const char *event_name)
241{
242 char *filename;
243 int err = -1, fd;
244
245 if (asprintf(&filename,
246 "/sys/kernel/debug/tracing/events/syscalls/%s/id",
247 event_name) < 0)
248 return -1;
249
250 fd = open(filename, O_RDONLY);
251 if (fd >= 0) {
252 char id[16];
253 if (read(fd, id, sizeof(id)) > 0)
254 err = atoi(id);
255 close(fd);
256 }
257
258 free(filename);
259 return err;
260}
261
262static int test__open_syscall_event(void)
263{
264 int err = -1, fd;
265 struct thread_map *threads;
266 struct perf_evsel *evsel;
267 unsigned int nr_open_calls = 111, i;
268 int id = trace_event__id("sys_enter_open");
269
270 if (id < 0) {
Arnaldo Carvalho de Melo454a3bb2011-01-04 10:40:08 -0200271 pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
Arnaldo Carvalho de Melod8548612011-01-04 00:16:20 -0200272 return -1;
273 }
274
275 threads = thread_map__new(-1, getpid());
276 if (threads == NULL) {
Arnaldo Carvalho de Melo454a3bb2011-01-04 10:40:08 -0200277 pr_debug("thread_map__new\n");
Arnaldo Carvalho de Melod8548612011-01-04 00:16:20 -0200278 return -1;
279 }
280
281 evsel = perf_evsel__new(PERF_TYPE_TRACEPOINT, id, 0);
282 if (evsel == NULL) {
Arnaldo Carvalho de Melo454a3bb2011-01-04 10:40:08 -0200283 pr_debug("perf_evsel__new\n");
Arnaldo Carvalho de Melod8548612011-01-04 00:16:20 -0200284 goto out_thread_map_delete;
285 }
286
287 if (perf_evsel__open_per_thread(evsel, threads) < 0) {
Arnaldo Carvalho de Melo454a3bb2011-01-04 10:40:08 -0200288 pr_debug("failed to open counter: %s, "
289 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
290 strerror(errno));
Arnaldo Carvalho de Melod8548612011-01-04 00:16:20 -0200291 goto out_evsel_delete;
292 }
293
294 for (i = 0; i < nr_open_calls; ++i) {
295 fd = open("/etc/passwd", O_RDONLY);
296 close(fd);
297 }
298
299 if (perf_evsel__read_on_cpu(evsel, 0, 0) < 0) {
Arnaldo Carvalho de Melo454a3bb2011-01-04 10:40:08 -0200300 pr_debug("perf_evsel__open_read_on_cpu\n");
Arnaldo Carvalho de Melod8548612011-01-04 00:16:20 -0200301 goto out_close_fd;
302 }
303
Arnaldo Carvalho de Melo454a3bb2011-01-04 10:40:08 -0200304 if (evsel->counts->cpu[0].val != nr_open_calls) {
305 pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls, got %Ld\n",
Arnaldo Carvalho de Melod8548612011-01-04 00:16:20 -0200306 nr_open_calls, evsel->counts->cpu[0].val);
Arnaldo Carvalho de Melo454a3bb2011-01-04 10:40:08 -0200307 goto out_close_fd;
308 }
Arnaldo Carvalho de Melod8548612011-01-04 00:16:20 -0200309
310 err = 0;
311out_close_fd:
312 perf_evsel__close_fd(evsel, 1, threads->nr);
313out_evsel_delete:
314 perf_evsel__delete(evsel);
315out_thread_map_delete:
316 thread_map__delete(threads);
317 return err;
318}
319
Arnaldo Carvalho de Melo1c6a8002010-04-29 18:58:32 -0300320static struct test {
321 const char *desc;
322 int (*func)(void);
323} tests[] = {
324 {
325 .desc = "vmlinux symtab matches kallsyms",
326 .func = test__vmlinux_matches_kallsyms,
327 },
328 {
Arnaldo Carvalho de Melod8548612011-01-04 00:16:20 -0200329 .desc = "detect open syscall event",
330 .func = test__open_syscall_event,
331 },
332 {
Arnaldo Carvalho de Melo1c6a8002010-04-29 18:58:32 -0300333 .func = NULL,
334 },
335};
336
337static int __cmd_test(void)
338{
339 int i = 0;
340
341 page_size = sysconf(_SC_PAGE_SIZE);
342
343 while (tests[i].func) {
344 int err;
345 pr_info("%2d: %s:", i + 1, tests[i].desc);
346 pr_debug("\n--- start ---\n");
347 err = tests[i].func();
348 pr_debug("---- end ----\n%s:", tests[i].desc);
349 pr_info(" %s\n", err ? "FAILED!\n" : "Ok");
350 ++i;
351 }
352
353 return 0;
354}
355
356static const char * const test_usage[] = {
357 "perf test [<options>]",
358 NULL,
359};
360
361static const struct option test_options[] = {
Arnaldo Carvalho de Melo80354582010-05-17 15:51:10 -0300362 OPT_INTEGER('v', "verbose", &verbose,
Arnaldo Carvalho de Melo1c6a8002010-04-29 18:58:32 -0300363 "be more verbose (show symbol address, etc)"),
364 OPT_END()
365};
366
367int cmd_test(int argc, const char **argv, const char *prefix __used)
368{
369 argc = parse_options(argc, argv, test_options, test_usage, 0);
370 if (argc)
371 usage_with_options(test_usage, test_options);
372
373 symbol_conf.priv_size = sizeof(int);
374 symbol_conf.sort_by_name = true;
375 symbol_conf.try_vmlinux_path = true;
376
377 if (symbol__init() < 0)
378 return -1;
379
380 setup_pager();
381
382 return __cmd_test();
383}