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kvm tools: Add ivshmem device
[linux-2.6/next.git] / tools / power / x86 / turbostat / turbostat.c
blob6d8ef4a3a9b5bd017a805a86ad2e3fd5737ca8e0
1 /*
2 * turbostat -- show CPU frequency and C-state residency
3 * on modern Intel turbo-capable processors.
4 *
5 * Copyright (c) 2010, Intel Corporation.
6 * Len Brown <len.brown@intel.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms and conditions of the GNU General Public License,
10 * version 2, as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * more details.
16 *
17 * You should have received a copy of the GNU General Public License along with
18 * this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
20 */
21
22 #include <stdio.h>
23 #include <unistd.h>
24 #include <sys/types.h>
25 #include <sys/wait.h>
26 #include <sys/stat.h>
27 #include <sys/resource.h>
28 #include <fcntl.h>
29 #include <signal.h>
30 #include <sys/time.h>
31 #include <stdlib.h>
32 #include <dirent.h>
33 #include <string.h>
34 #include <ctype.h>
35
36 #define MSR_TSC 0x10
37 #define MSR_NEHALEM_PLATFORM_INFO 0xCE
38 #define MSR_NEHALEM_TURBO_RATIO_LIMIT 0x1AD
39 #define MSR_APERF 0xE8
40 #define MSR_MPERF 0xE7
41 #define MSR_PKG_C2_RESIDENCY 0x60D /* SNB only */
42 #define MSR_PKG_C3_RESIDENCY 0x3F8
43 #define MSR_PKG_C6_RESIDENCY 0x3F9
44 #define MSR_PKG_C7_RESIDENCY 0x3FA /* SNB only */
45 #define MSR_CORE_C3_RESIDENCY 0x3FC
46 #define MSR_CORE_C6_RESIDENCY 0x3FD
47 #define MSR_CORE_C7_RESIDENCY 0x3FE /* SNB only */
48
49 char *proc_stat = "/proc/stat";
50 unsigned int interval_sec = 5; /* set with -i interval_sec */
51 unsigned int verbose; /* set with -v */
52 unsigned int skip_c0;
53 unsigned int skip_c1;
54 unsigned int do_nhm_cstates;
55 unsigned int do_snb_cstates;
56 unsigned int has_aperf;
57 unsigned int units = 1000000000; /* Ghz etc */
58 unsigned int genuine_intel;
59 unsigned int has_invariant_tsc;
60 unsigned int do_nehalem_platform_info;
61 unsigned int do_nehalem_turbo_ratio_limit;
62 unsigned int extra_msr_offset;
63 double bclk;
64 unsigned int show_pkg;
65 unsigned int show_core;
66 unsigned int show_cpu;
67
68 int aperf_mperf_unstable;
69 int backwards_count;
70 char *progname;
71 int need_reinitialize;
72
73 int num_cpus;
74
75 struct counters {
76 unsigned long long tsc; /* per thread */
77 unsigned long long aperf; /* per thread */
78 unsigned long long mperf; /* per thread */
79 unsigned long long c1; /* per thread (calculated) */
80 unsigned long long c3; /* per core */
81 unsigned long long c6; /* per core */
82 unsigned long long c7; /* per core */
83 unsigned long long pc2; /* per package */
84 unsigned long long pc3; /* per package */
85 unsigned long long pc6; /* per package */
86 unsigned long long pc7; /* per package */
87 unsigned long long extra_msr; /* per thread */
88 int pkg;
89 int core;
90 int cpu;
91 struct counters *next;
92 };
93
94 struct counters *cnt_even;
95 struct counters *cnt_odd;
96 struct counters *cnt_delta;
97 struct counters *cnt_average;
98 struct timeval tv_even;
99 struct timeval tv_odd;
100 struct timeval tv_delta;
101
102 unsigned long long get_msr(int cpu, off_t offset)
103 {
104 ssize_t retval;
105 unsigned long long msr;
106 char pathname[32];
107 int fd;
108
109 sprintf(pathname, "/dev/cpu/%d/msr", cpu);
110 fd = open(pathname, O_RDONLY);
111 if (fd < 0) {
112 perror(pathname);
113 need_reinitialize = 1;
114 return 0;
115 }
116
117 retval = pread(fd, &msr, sizeof msr, offset);
118 if (retval != sizeof msr) {
119 fprintf(stderr, "cpu%d pread(..., 0x%zx) = %jd\n",
120 cpu, offset, retval);
121 exit(-2);
122 }
123
124 close(fd);
125 return msr;
126 }
127
128 void print_header(void)
129 {
130 if (show_pkg)
131 fprintf(stderr, "pkg ");
132 if (show_core)
133 fprintf(stderr, "core");
134 if (show_cpu)
135 fprintf(stderr, " CPU");
136 if (do_nhm_cstates)
137 fprintf(stderr, " %%c0 ");
138 if (has_aperf)
139 fprintf(stderr, " GHz");
140 fprintf(stderr, " TSC");
141 if (do_nhm_cstates)
142 fprintf(stderr, " %%c1 ");
143 if (do_nhm_cstates)
144 fprintf(stderr, " %%c3 ");
145 if (do_nhm_cstates)
146 fprintf(stderr, " %%c6 ");
147 if (do_snb_cstates)
148 fprintf(stderr, " %%c7 ");
149 if (do_snb_cstates)
150 fprintf(stderr, " %%pc2 ");
151 if (do_nhm_cstates)
152 fprintf(stderr, " %%pc3 ");
153 if (do_nhm_cstates)
154 fprintf(stderr, " %%pc6 ");
155 if (do_snb_cstates)
156 fprintf(stderr, " %%pc7 ");
157 if (extra_msr_offset)
158 fprintf(stderr, " MSR 0x%x ", extra_msr_offset);
159
160 putc('\n', stderr);
161 }
162
163 void dump_cnt(struct counters *cnt)
164 {
165 fprintf(stderr, "package: %d ", cnt->pkg);
166 fprintf(stderr, "core:: %d ", cnt->core);
167 fprintf(stderr, "CPU: %d ", cnt->cpu);
168 fprintf(stderr, "TSC: %016llX\n", cnt->tsc);
169 fprintf(stderr, "c3: %016llX\n", cnt->c3);
170 fprintf(stderr, "c6: %016llX\n", cnt->c6);
171 fprintf(stderr, "c7: %016llX\n", cnt->c7);
172 fprintf(stderr, "aperf: %016llX\n", cnt->aperf);
173 fprintf(stderr, "pc2: %016llX\n", cnt->pc2);
174 fprintf(stderr, "pc3: %016llX\n", cnt->pc3);
175 fprintf(stderr, "pc6: %016llX\n", cnt->pc6);
176 fprintf(stderr, "pc7: %016llX\n", cnt->pc7);
177 fprintf(stderr, "msr0x%x: %016llX\n", extra_msr_offset, cnt->extra_msr);
178 }
179
180 void dump_list(struct counters *cnt)
181 {
182 printf("dump_list 0x%p\n", cnt);
183
184 for (; cnt; cnt = cnt->next)
185 dump_cnt(cnt);
186 }
187
188 void print_cnt(struct counters *p)
189 {
190 double interval_float;
191
192 interval_float = tv_delta.tv_sec + tv_delta.tv_usec/1000000.0;
193
194 /* topology columns, print blanks on 1st (average) line */
195 if (p == cnt_average) {
196 if (show_pkg)
197 fprintf(stderr, " ");
198 if (show_core)
199 fprintf(stderr, " ");
200 if (show_cpu)
201 fprintf(stderr, " ");
202 } else {
203 if (show_pkg)
204 fprintf(stderr, "%4d", p->pkg);
205 if (show_core)
206 fprintf(stderr, "%4d", p->core);
207 if (show_cpu)
208 fprintf(stderr, "%4d", p->cpu);
209 }
210
211 /* %c0 */
212 if (do_nhm_cstates) {
213 if (!skip_c0)
214 fprintf(stderr, "%7.2f", 100.0 * p->mperf/p->tsc);
215 else
216 fprintf(stderr, " ****");
217 }
218
219 /* GHz */
220 if (has_aperf) {
221 if (!aperf_mperf_unstable) {
222 fprintf(stderr, "%5.2f",
223 1.0 * p->tsc / units * p->aperf /
224 p->mperf / interval_float);
225 } else {
226 if (p->aperf > p->tsc || p->mperf > p->tsc) {
227 fprintf(stderr, " ****");
228 } else {
229 fprintf(stderr, "%4.1f*",
230 1.0 * p->tsc /
231 units * p->aperf /
232 p->mperf / interval_float);
233 }
234 }
235 }
236
237 /* TSC */
238 fprintf(stderr, "%5.2f", 1.0 * p->tsc/units/interval_float);
239
240 if (do_nhm_cstates) {
241 if (!skip_c1)
242 fprintf(stderr, "%7.2f", 100.0 * p->c1/p->tsc);
243 else
244 fprintf(stderr, " ****");
245 }
246 if (do_nhm_cstates)
247 fprintf(stderr, "%7.2f", 100.0 * p->c3/p->tsc);
248 if (do_nhm_cstates)
249 fprintf(stderr, "%7.2f", 100.0 * p->c6/p->tsc);
250 if (do_snb_cstates)
251 fprintf(stderr, "%7.2f", 100.0 * p->c7/p->tsc);
252 if (do_snb_cstates)
253 fprintf(stderr, "%7.2f", 100.0 * p->pc2/p->tsc);
254 if (do_nhm_cstates)
255 fprintf(stderr, "%7.2f", 100.0 * p->pc3/p->tsc);
256 if (do_nhm_cstates)
257 fprintf(stderr, "%7.2f", 100.0 * p->pc6/p->tsc);
258 if (do_snb_cstates)
259 fprintf(stderr, "%7.2f", 100.0 * p->pc7/p->tsc);
260 if (extra_msr_offset)
261 fprintf(stderr, " 0x%016llx", p->extra_msr);
262 putc('\n', stderr);
263 }
264
265 void print_counters(struct counters *counters)
266 {
267 struct counters *cnt;
268
269 print_header();
270
271 if (num_cpus > 1)
272 print_cnt(cnt_average);
273
274 for (cnt = counters; cnt != NULL; cnt = cnt->next)
275 print_cnt(cnt);
276
277 }
278
279 #define SUBTRACT_COUNTER(after, before, delta) (delta = (after - before), (before > after))
280
281 int compute_delta(struct counters *after,
282 struct counters *before, struct counters *delta)
283 {
284 int errors = 0;
285 int perf_err = 0;
286
287 skip_c0 = skip_c1 = 0;
288
289 for ( ; after && before && delta;
290 after = after->next, before = before->next, delta = delta->next) {
291 if (before->cpu != after->cpu) {
292 printf("cpu configuration changed: %d != %d\n",
293 before->cpu, after->cpu);
294 return -1;
295 }
296
297 if (SUBTRACT_COUNTER(after->tsc, before->tsc, delta->tsc)) {
298 fprintf(stderr, "cpu%d TSC went backwards %llX to %llX\n",
299 before->cpu, before->tsc, after->tsc);
300 errors++;
301 }
302 /* check for TSC < 1 Mcycles over interval */
303 if (delta->tsc < (1000 * 1000)) {
304 fprintf(stderr, "Insanely slow TSC rate,"
305 " TSC stops in idle?\n");
306 fprintf(stderr, "You can disable all c-states"
307 " by booting with \"idle=poll\"\n");
308 fprintf(stderr, "or just the deep ones with"
309 " \"processor.max_cstate=1\"\n");
310 exit(-3);
311 }
312 if (SUBTRACT_COUNTER(after->c3, before->c3, delta->c3)) {
313 fprintf(stderr, "cpu%d c3 counter went backwards %llX to %llX\n",
314 before->cpu, before->c3, after->c3);
315 errors++;
316 }
317 if (SUBTRACT_COUNTER(after->c6, before->c6, delta->c6)) {
318 fprintf(stderr, "cpu%d c6 counter went backwards %llX to %llX\n",
319 before->cpu, before->c6, after->c6);
320 errors++;
321 }
322 if (SUBTRACT_COUNTER(after->c7, before->c7, delta->c7)) {
323 fprintf(stderr, "cpu%d c7 counter went backwards %llX to %llX\n",
324 before->cpu, before->c7, after->c7);
325 errors++;
326 }
327 if (SUBTRACT_COUNTER(after->pc2, before->pc2, delta->pc2)) {
328 fprintf(stderr, "cpu%d pc2 counter went backwards %llX to %llX\n",
329 before->cpu, before->pc2, after->pc2);
330 errors++;
331 }
332 if (SUBTRACT_COUNTER(after->pc3, before->pc3, delta->pc3)) {
333 fprintf(stderr, "cpu%d pc3 counter went backwards %llX to %llX\n",
334 before->cpu, before->pc3, after->pc3);
335 errors++;
336 }
337 if (SUBTRACT_COUNTER(after->pc6, before->pc6, delta->pc6)) {
338 fprintf(stderr, "cpu%d pc6 counter went backwards %llX to %llX\n",
339 before->cpu, before->pc6, after->pc6);
340 errors++;
341 }
342 if (SUBTRACT_COUNTER(after->pc7, before->pc7, delta->pc7)) {
343 fprintf(stderr, "cpu%d pc7 counter went backwards %llX to %llX\n",
344 before->cpu, before->pc7, after->pc7);
345 errors++;
346 }
347
348 perf_err = SUBTRACT_COUNTER(after->aperf, before->aperf, delta->aperf);
349 if (perf_err) {
350 fprintf(stderr, "cpu%d aperf counter went backwards %llX to %llX\n",
351 before->cpu, before->aperf, after->aperf);
352 }
353 perf_err |= SUBTRACT_COUNTER(after->mperf, before->mperf, delta->mperf);
354 if (perf_err) {
355 fprintf(stderr, "cpu%d mperf counter went backwards %llX to %llX\n",
356 before->cpu, before->mperf, after->mperf);
357 }
358 if (perf_err) {
359 if (!aperf_mperf_unstable) {
360 fprintf(stderr, "%s: APERF or MPERF went backwards *\n", progname);
361 fprintf(stderr, "* Frequency results do not cover entire interval *\n");
362 fprintf(stderr, "* fix this by running Linux-2.6.30 or later *\n");
363
364 aperf_mperf_unstable = 1;
365 }
366 /*
367 * mperf delta is likely a huge "positive" number
368 * can not use it for calculating c0 time
369 */
370 skip_c0 = 1;
371 skip_c1 = 1;
372 }
373
374 /*
375 * As mperf and tsc collection are not atomic,
376 * it is possible for mperf's non-halted cycles
377 * to exceed TSC's all cycles: show c1 = 0% in that case.
378 */
379 if (delta->mperf > delta->tsc)
380 delta->c1 = 0;
381 else /* normal case, derive c1 */
382 delta->c1 = delta->tsc - delta->mperf
383 - delta->c3 - delta->c6 - delta->c7;
384
385 if (delta->mperf == 0)
386 delta->mperf = 1; /* divide by 0 protection */
387
388 /*
389 * for "extra msr", just copy the latest w/o subtracting
390 */
391 delta->extra_msr = after->extra_msr;
392 if (errors) {
393 fprintf(stderr, "ERROR cpu%d before:\n", before->cpu);
394 dump_cnt(before);
395 fprintf(stderr, "ERROR cpu%d after:\n", before->cpu);
396 dump_cnt(after);
397 errors = 0;
398 }
399 }
400 return 0;
401 }
402
403 void compute_average(struct counters *delta, struct counters *avg)
404 {
405 struct counters *sum;
406
407 sum = calloc(1, sizeof(struct counters));
408 if (sum == NULL) {
409 perror("calloc sum");
410 exit(1);
411 }
412
413 for (; delta; delta = delta->next) {
414 sum->tsc += delta->tsc;
415 sum->c1 += delta->c1;
416 sum->c3 += delta->c3;
417 sum->c6 += delta->c6;
418 sum->c7 += delta->c7;
419 sum->aperf += delta->aperf;
420 sum->mperf += delta->mperf;
421 sum->pc2 += delta->pc2;
422 sum->pc3 += delta->pc3;
423 sum->pc6 += delta->pc6;
424 sum->pc7 += delta->pc7;
425 }
426 avg->tsc = sum->tsc/num_cpus;
427 avg->c1 = sum->c1/num_cpus;
428 avg->c3 = sum->c3/num_cpus;
429 avg->c6 = sum->c6/num_cpus;
430 avg->c7 = sum->c7/num_cpus;
431 avg->aperf = sum->aperf/num_cpus;
432 avg->mperf = sum->mperf/num_cpus;
433 avg->pc2 = sum->pc2/num_cpus;
434 avg->pc3 = sum->pc3/num_cpus;
435 avg->pc6 = sum->pc6/num_cpus;
436 avg->pc7 = sum->pc7/num_cpus;
437
438 free(sum);
439 }
440
441 void get_counters(struct counters *cnt)
442 {
443 for ( ; cnt; cnt = cnt->next) {
444 cnt->tsc = get_msr(cnt->cpu, MSR_TSC);
445 if (do_nhm_cstates)
446 cnt->c3 = get_msr(cnt->cpu, MSR_CORE_C3_RESIDENCY);
447 if (do_nhm_cstates)
448 cnt->c6 = get_msr(cnt->cpu, MSR_CORE_C6_RESIDENCY);
449 if (do_snb_cstates)
450 cnt->c7 = get_msr(cnt->cpu, MSR_CORE_C7_RESIDENCY);
451 if (has_aperf)
452 cnt->aperf = get_msr(cnt->cpu, MSR_APERF);
453 if (has_aperf)
454 cnt->mperf = get_msr(cnt->cpu, MSR_MPERF);
455 if (do_snb_cstates)
456 cnt->pc2 = get_msr(cnt->cpu, MSR_PKG_C2_RESIDENCY);
457 if (do_nhm_cstates)
458 cnt->pc3 = get_msr(cnt->cpu, MSR_PKG_C3_RESIDENCY);
459 if (do_nhm_cstates)
460 cnt->pc6 = get_msr(cnt->cpu, MSR_PKG_C6_RESIDENCY);
461 if (do_snb_cstates)
462 cnt->pc7 = get_msr(cnt->cpu, MSR_PKG_C7_RESIDENCY);
463 if (extra_msr_offset)
464 cnt->extra_msr = get_msr(cnt->cpu, extra_msr_offset);
465 }
466 }
467
468 void print_nehalem_info(void)
469 {
470 unsigned long long msr;
471 unsigned int ratio;
472
473 if (!do_nehalem_platform_info)
474 return;
475
476 msr = get_msr(0, MSR_NEHALEM_PLATFORM_INFO);
477
478 ratio = (msr >> 40) & 0xFF;
479 fprintf(stderr, "%d * %.0f = %.0f MHz max efficiency\n",
480 ratio, bclk, ratio * bclk);
481
482 ratio = (msr >> 8) & 0xFF;
483 fprintf(stderr, "%d * %.0f = %.0f MHz TSC frequency\n",
484 ratio, bclk, ratio * bclk);
485
486 if (verbose > 1)
487 fprintf(stderr, "MSR_NEHALEM_PLATFORM_INFO: 0x%llx\n", msr);
488
489 if (!do_nehalem_turbo_ratio_limit)
490 return;
491
492 msr = get_msr(0, MSR_NEHALEM_TURBO_RATIO_LIMIT);
493
494 ratio = (msr >> 24) & 0xFF;
495 if (ratio)
496 fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 4 active cores\n",
497 ratio, bclk, ratio * bclk);
498
499 ratio = (msr >> 16) & 0xFF;
500 if (ratio)
501 fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 3 active cores\n",
502 ratio, bclk, ratio * bclk);
503
504 ratio = (msr >> 8) & 0xFF;
505 if (ratio)
506 fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 2 active cores\n",
507 ratio, bclk, ratio * bclk);
508
509 ratio = (msr >> 0) & 0xFF;
510 if (ratio)
511 fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 1 active cores\n",
512 ratio, bclk, ratio * bclk);
513
514 }
515
516 void free_counter_list(struct counters *list)
517 {
518 struct counters *p;
519
520 for (p = list; p; ) {
521 struct counters *free_me;
522
523 free_me = p;
524 p = p->next;
525 free(free_me);
526 }
527 }
528
529 void free_all_counters(void)
530 {
531 free_counter_list(cnt_even);
532 cnt_even = NULL;
533
534 free_counter_list(cnt_odd);
535 cnt_odd = NULL;
536
537 free_counter_list(cnt_delta);
538 cnt_delta = NULL;
539
540 free_counter_list(cnt_average);
541 cnt_average = NULL;
542 }
543
544 void insert_counters(struct counters **list,
545 struct counters *new)
546 {
547 struct counters *prev;
548
549 /*
550 * list was empty
551 */
552 if (*list == NULL) {
553 new->next = *list;
554 *list = new;
555 return;
556 }
557
558 show_cpu = 1; /* there is more than one CPU */
559
560 /*
561 * insert on front of list.
562 * It is sorted by ascending package#, core#, cpu#
563 */
564 if (((*list)->pkg > new->pkg) ||
565 (((*list)->pkg == new->pkg) && ((*list)->core > new->core)) ||
566 (((*list)->pkg == new->pkg) && ((*list)->core == new->core) && ((*list)->cpu > new->cpu))) {
567 new->next = *list;
568 *list = new;
569 return;
570 }
571
572 prev = *list;
573
574 while (prev->next && (prev->next->pkg < new->pkg)) {
575 prev = prev->next;
576 show_pkg = 1; /* there is more than 1 package */
577 }
578
579 while (prev->next && (prev->next->pkg == new->pkg)
580 && (prev->next->core < new->core)) {
581 prev = prev->next;
582 show_core = 1; /* there is more than 1 core */
583 }
584
585 while (prev->next && (prev->next->pkg == new->pkg)
586 && (prev->next->core == new->core)
587 && (prev->next->cpu < new->cpu)) {
588 prev = prev->next;
589 }
590
591 /*
592 * insert after "prev"
593 */
594 new->next = prev->next;
595 prev->next = new;
596 }
597
598 void alloc_new_counters(int pkg, int core, int cpu)
599 {
600 struct counters *new;
601
602 if (verbose > 1)
603 printf("pkg%d core%d, cpu%d\n", pkg, core, cpu);
604
605 new = (struct counters *)calloc(1, sizeof(struct counters));
606 if (new == NULL) {
607 perror("calloc");
608 exit(1);
609 }
610 new->pkg = pkg;
611 new->core = core;
612 new->cpu = cpu;
613 insert_counters(&cnt_odd, new);
614
615 new = (struct counters *)calloc(1,
616 sizeof(struct counters));
617 if (new == NULL) {
618 perror("calloc");
619 exit(1);
620 }
621 new->pkg = pkg;
622 new->core = core;
623 new->cpu = cpu;
624 insert_counters(&cnt_even, new);
625
626 new = (struct counters *)calloc(1, sizeof(struct counters));
627 if (new == NULL) {
628 perror("calloc");
629 exit(1);
630 }
631 new->pkg = pkg;
632 new->core = core;
633 new->cpu = cpu;
634 insert_counters(&cnt_delta, new);
635
636 new = (struct counters *)calloc(1, sizeof(struct counters));
637 if (new == NULL) {
638 perror("calloc");
639 exit(1);
640 }
641 new->pkg = pkg;
642 new->core = core;
643 new->cpu = cpu;
644 cnt_average = new;
645 }
646
647 int get_physical_package_id(int cpu)
648 {
649 char path[64];
650 FILE *filep;
651 int pkg;
652
653 sprintf(path, "/sys/devices/system/cpu/cpu%d/topology/physical_package_id", cpu);
654 filep = fopen(path, "r");
655 if (filep == NULL) {
656 perror(path);
657 exit(1);
658 }
659 fscanf(filep, "%d", &pkg);
660 fclose(filep);
661 return pkg;
662 }
663
664 int get_core_id(int cpu)
665 {
666 char path[64];
667 FILE *filep;
668 int core;
669
670 sprintf(path, "/sys/devices/system/cpu/cpu%d/topology/core_id", cpu);
671 filep = fopen(path, "r");
672 if (filep == NULL) {
673 perror(path);
674 exit(1);
675 }
676 fscanf(filep, "%d", &core);
677 fclose(filep);
678 return core;
679 }
680
681 /*
682 * run func(index, cpu) on every cpu in /proc/stat
683 */
684
685 int for_all_cpus(void (func)(int, int, int))
686 {
687 FILE *fp;
688 int cpu_count;
689 int retval;
690
691 fp = fopen(proc_stat, "r");
692 if (fp == NULL) {
693 perror(proc_stat);
694 exit(1);
695 }
696
697 retval = fscanf(fp, "cpu %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d\n");
698 if (retval != 0) {
699 perror("/proc/stat format");
700 exit(1);
701 }
702
703 for (cpu_count = 0; ; cpu_count++) {
704 int cpu;
705
706 retval = fscanf(fp, "cpu%u %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d\n", &cpu);
707 if (retval != 1)
708 break;
709
710 func(get_physical_package_id(cpu), get_core_id(cpu), cpu);
711 }
712 fclose(fp);
713 return cpu_count;
714 }
715
716 void re_initialize(void)
717 {
718 printf("turbostat: topology changed, re-initializing.\n");
719 free_all_counters();
720 num_cpus = for_all_cpus(alloc_new_counters);
721 need_reinitialize = 0;
722 printf("num_cpus is now %d\n", num_cpus);
723 }
724
725 void dummy(int pkg, int core, int cpu) { return; }
726 /*
727 * check to see if a cpu came on-line
728 */
729 void verify_num_cpus(void)
730 {
731 int new_num_cpus;
732
733 new_num_cpus = for_all_cpus(dummy);
734
735 if (new_num_cpus != num_cpus) {
736 if (verbose)
737 printf("num_cpus was %d, is now %d\n",
738 num_cpus, new_num_cpus);
739 need_reinitialize = 1;
740 }
741 }
742
743 void turbostat_loop()
744 {
745 restart:
746 get_counters(cnt_even);
747 gettimeofday(&tv_even, (struct timezone *)NULL);
748
749 while (1) {
750 verify_num_cpus();
751 if (need_reinitialize) {
752 re_initialize();
753 goto restart;
754 }
755 sleep(interval_sec);
756 get_counters(cnt_odd);
757 gettimeofday(&tv_odd, (struct timezone *)NULL);
758
759 compute_delta(cnt_odd, cnt_even, cnt_delta);
760 timersub(&tv_odd, &tv_even, &tv_delta);
761 compute_average(cnt_delta, cnt_average);
762 print_counters(cnt_delta);
763 if (need_reinitialize) {
764 re_initialize();
765 goto restart;
766 }
767 sleep(interval_sec);
768 get_counters(cnt_even);
769 gettimeofday(&tv_even, (struct timezone *)NULL);
770 compute_delta(cnt_even, cnt_odd, cnt_delta);
771 timersub(&tv_even, &tv_odd, &tv_delta);
772 compute_average(cnt_delta, cnt_average);
773 print_counters(cnt_delta);
774 }
775 }
776
777 void check_dev_msr()
778 {
779 struct stat sb;
780
781 if (stat("/dev/cpu/0/msr", &sb)) {
782 fprintf(stderr, "no /dev/cpu/0/msr\n");
783 fprintf(stderr, "Try \"# modprobe msr\"\n");
784 exit(-5);
785 }
786 }
787
788 void check_super_user()
789 {
790 if (getuid() != 0) {
791 fprintf(stderr, "must be root\n");
792 exit(-6);
793 }
794 }
795
796 int has_nehalem_turbo_ratio_limit(unsigned int family, unsigned int model)
797 {
798 if (!genuine_intel)
799 return 0;
800
801 if (family != 6)
802 return 0;
803
804 switch (model) {
805 case 0x1A: /* Core i7, Xeon 5500 series - Bloomfield, Gainstown NHM-EP */
806 case 0x1E: /* Core i7 and i5 Processor - Clarksfield, Lynnfield, Jasper Forest */
807 case 0x1F: /* Core i7 and i5 Processor - Nehalem */
808 case 0x25: /* Westmere Client - Clarkdale, Arrandale */
809 case 0x2C: /* Westmere EP - Gulftown */
810 case 0x2A: /* SNB */
811 case 0x2D: /* SNB Xeon */
812 return 1;
813 case 0x2E: /* Nehalem-EX Xeon - Beckton */
814 case 0x2F: /* Westmere-EX Xeon - Eagleton */
815 default:
816 return 0;
817 }
818 }
819
820 int is_snb(unsigned int family, unsigned int model)
821 {
822 if (!genuine_intel)
823 return 0;
824
825 switch (model) {
826 case 0x2A:
827 case 0x2D:
828 return 1;
829 }
830 return 0;
831 }
832
833 double discover_bclk(unsigned int family, unsigned int model)
834 {
835 if (is_snb(family, model))
836 return 100.00;
837 else
838 return 133.33;
839 }
840
841 void check_cpuid()
842 {
843 unsigned int eax, ebx, ecx, edx, max_level;
844 unsigned int fms, family, model, stepping;
845
846 eax = ebx = ecx = edx = 0;
847
848 asm("cpuid" : "=a" (max_level), "=b" (ebx), "=c" (ecx), "=d" (edx) : "a" (0));
849
850 if (ebx == 0x756e6547 && edx == 0x49656e69 && ecx == 0x6c65746e)
851 genuine_intel = 1;
852
853 if (verbose)
854 fprintf(stderr, "%.4s%.4s%.4s ",
855 (char *)&ebx, (char *)&edx, (char *)&ecx);
856
857 asm("cpuid" : "=a" (fms), "=c" (ecx), "=d" (edx) : "a" (1) : "ebx");
858 family = (fms >> 8) & 0xf;
859 model = (fms >> 4) & 0xf;
860 stepping = fms & 0xf;
861 if (family == 6 || family == 0xf)
862 model += ((fms >> 16) & 0xf) << 4;
863
864 if (verbose)
865 fprintf(stderr, "%d CPUID levels; family:model:stepping 0x%x:%x:%x (%d:%d:%d)\n",
866 max_level, family, model, stepping, family, model, stepping);
867
868 if (!(edx & (1 << 5))) {
869 fprintf(stderr, "CPUID: no MSR\n");
870 exit(1);
871 }
872
873 /*
874 * check max extended function levels of CPUID.
875 * This is needed to check for invariant TSC.
876 * This check is valid for both Intel and AMD.
877 */
878 ebx = ecx = edx = 0;
879 asm("cpuid" : "=a" (max_level), "=b" (ebx), "=c" (ecx), "=d" (edx) : "a" (0x80000000));
880
881 if (max_level < 0x80000007) {
882 fprintf(stderr, "CPUID: no invariant TSC (max_level 0x%x)\n", max_level);
883 exit(1);
884 }
885
886 /*
887 * Non-Stop TSC is advertised by CPUID.EAX=0x80000007: EDX.bit8
888 * this check is valid for both Intel and AMD
889 */
890 asm("cpuid" : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx) : "a" (0x80000007));
891 has_invariant_tsc = edx & (1 << 8);
892
893 if (!has_invariant_tsc) {
894 fprintf(stderr, "No invariant TSC\n");
895 exit(1);
896 }
897
898 /*
899 * APERF/MPERF is advertised by CPUID.EAX=0x6: ECX.bit0
900 * this check is valid for both Intel and AMD
901 */
902
903 asm("cpuid" : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx) : "a" (0x6));
904 has_aperf = ecx & (1 << 0);
905 if (!has_aperf) {
906 fprintf(stderr, "No APERF MSR\n");
907 exit(1);
908 }
909
910 do_nehalem_platform_info = genuine_intel && has_invariant_tsc;
911 do_nhm_cstates = genuine_intel; /* all Intel w/ non-stop TSC have NHM counters */
912 do_snb_cstates = is_snb(family, model);
913 bclk = discover_bclk(family, model);
914
915 do_nehalem_turbo_ratio_limit = has_nehalem_turbo_ratio_limit(family, model);
916 }
917
918
919 void usage()
920 {
921 fprintf(stderr, "%s: [-v] [-M MSR#] [-i interval_sec | command ...]\n",
922 progname);
923 exit(1);
924 }
925
926
927 /*
928 * in /dev/cpu/ return success for names that are numbers
929 * ie. filter out ".", "..", "microcode".
930 */
931 int dir_filter(const struct dirent *dirp)
932 {
933 if (isdigit(dirp->d_name[0]))
934 return 1;
935 else
936 return 0;
937 }
938
939 int open_dev_cpu_msr(int dummy1)
940 {
941 return 0;
942 }
943
944 void turbostat_init()
945 {
946 check_cpuid();
947
948 check_dev_msr();
949 check_super_user();
950
951 num_cpus = for_all_cpus(alloc_new_counters);
952
953 if (verbose)
954 print_nehalem_info();
955 }
956
957 int fork_it(char **argv)
958 {
959 int retval;
960 pid_t child_pid;
961 get_counters(cnt_even);
962 gettimeofday(&tv_even, (struct timezone *)NULL);
963
964 child_pid = fork();
965 if (!child_pid) {
966 /* child */
967 execvp(argv[0], argv);
968 } else {
969 int status;
970
971 /* parent */
972 if (child_pid == -1) {
973 perror("fork");
974 exit(1);
975 }
976
977 signal(SIGINT, SIG_IGN);
978 signal(SIGQUIT, SIG_IGN);
979 if (waitpid(child_pid, &status, 0) == -1) {
980 perror("wait");
981 exit(1);
982 }
983 }
984 get_counters(cnt_odd);
985 gettimeofday(&tv_odd, (struct timezone *)NULL);
986 retval = compute_delta(cnt_odd, cnt_even, cnt_delta);
987
988 timersub(&tv_odd, &tv_even, &tv_delta);
989 compute_average(cnt_delta, cnt_average);
990 if (!retval)
991 print_counters(cnt_delta);
992
993 fprintf(stderr, "%.6f sec\n", tv_delta.tv_sec + tv_delta.tv_usec/1000000.0);
994
995 return 0;
996 }
997
998 void cmdline(int argc, char **argv)
999 {
1000 int opt;
1001
1002 progname = argv[0];
1003
1004 while ((opt = getopt(argc, argv, "+vi:M:")) != -1) {
1005 switch (opt) {
1006 case 'v':
1007 verbose++;
1008 break;
1009 case 'i':
1010 interval_sec = atoi(optarg);
1011 break;
1012 case 'M':
1013 sscanf(optarg, "%x", &extra_msr_offset);
1014 if (verbose > 1)
1015 fprintf(stderr, "MSR 0x%X\n", extra_msr_offset);
1016 break;
1017 default:
1018 usage();
1019 }
1020 }
1021 }
1022
1023 int main(int argc, char **argv)
1024 {
1025 cmdline(argc, argv);
1026
1027 if (verbose > 1)
1028 fprintf(stderr, "turbostat Dec 6, 2010"
1029 " - Len Brown <lenb@kernel.org>\n");
1030 if (verbose > 1)
1031 fprintf(stderr, "http://userweb.kernel.org/~lenb/acpi/utils/pmtools/turbostat/\n");
1032
1033 turbostat_init();
1034
1035 /*
1036 * if any params left, it must be a command to fork
1037 */
1038 if (argc - optind)
1039 return fork_it(argv + optind);
1040 else
1041 turbostat_loop();
1042
1043 return 0;
1044 }
linux-next