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Linux/tools/power/cpupower/utils/idle_monitor/cpupower-monitor.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  *  (C) 2010,2011       Thomas Renninger <trenn@suse.de>, Novell Inc.
  4  *
  5  *  Output format inspired by Len Brown's <lenb@kernel.org> turbostat tool.
  6  */
  7 
  8 
  9 #include <stdio.h>
 10 #include <unistd.h>
 11 #include <stdlib.h>
 12 #include <string.h>
 13 #include <time.h>
 14 #include <signal.h>
 15 #include <sys/types.h>
 16 #include <sys/wait.h>
 17 #include <libgen.h>
 18 
 19 #include "idle_monitor/cpupower-monitor.h"
 20 #include "idle_monitor/idle_monitors.h"
 21 #include "helpers/helpers.h"
 22 
 23 /* Define pointers to all monitors.  */
 24 #define DEF(x) & x ## _monitor ,
 25 struct cpuidle_monitor *all_monitors[] = {
 26 #include "idle_monitors.def"
 27 
 28 };
 29 
 30 static struct cpuidle_monitor *monitors[MONITORS_MAX];
 31 static unsigned int avail_monitors;
 32 
 33 static char *progname;
 34 
 35 enum operation_mode_e { list = 1, show, show_all };
 36 static int mode;
 37 static int interval = 1;
 38 static char *show_monitors_param;
 39 static struct cpupower_topology cpu_top;
 40 static unsigned int wake_cpus;
 41 
 42 /* ToDo: Document this in the manpage */
 43 static char range_abbr[RANGE_MAX] = { 'T', 'C', 'P', 'M', };
 44 
 45 static void print_wrong_arg_exit(void)
 46 {
 47         printf(_("invalid or unknown argument\n"));
 48         exit(EXIT_FAILURE);
 49 }
 50 
 51 long long timespec_diff_us(struct timespec start, struct timespec end)
 52 {
 53         struct timespec temp;
 54         if ((end.tv_nsec - start.tv_nsec) < 0) {
 55                 temp.tv_sec = end.tv_sec - start.tv_sec - 1;
 56                 temp.tv_nsec = 1000000000 + end.tv_nsec - start.tv_nsec;
 57         } else {
 58                 temp.tv_sec = end.tv_sec - start.tv_sec;
 59                 temp.tv_nsec = end.tv_nsec - start.tv_nsec;
 60         }
 61         return (temp.tv_sec * 1000000) + (temp.tv_nsec / 1000);
 62 }
 63 
 64 void print_n_spaces(int n)
 65 {
 66         int x;
 67         for (x = 0; x < n; x++)
 68                 printf(" ");
 69 }
 70 
 71 /*s is filled with left and right spaces
 72  *to make its length atleast n+1
 73  */
 74 int fill_string_with_spaces(char *s, int n)
 75 {
 76         char *temp;
 77         int len = strlen(s);
 78 
 79         if (len >= n)
 80                 return -1;
 81 
 82         temp = malloc(sizeof(char) * (n+1));
 83         for (; len < n; len++)
 84                 s[len] = ' ';
 85         s[len] = '\0';
 86         snprintf(temp, n+1, " %s", s);
 87         strcpy(s, temp);
 88         free(temp);
 89         return 0;
 90 }
 91 
 92 #define MAX_COL_WIDTH 6
 93 void print_header(int topology_depth)
 94 {
 95         int unsigned mon;
 96         int state, need_len;
 97         cstate_t s;
 98         char buf[128] = "";
 99 
100         fill_string_with_spaces(buf, topology_depth * 5 - 1);
101         printf("%s|", buf);
102 
103         for (mon = 0; mon < avail_monitors; mon++) {
104                 need_len = monitors[mon]->hw_states_num * (MAX_COL_WIDTH + 1)
105                         - 1;
106                 if (mon != 0)
107                         printf("||");
108                 sprintf(buf, "%s", monitors[mon]->name);
109                 fill_string_with_spaces(buf, need_len);
110                 printf("%s", buf);
111         }
112         printf("\n");
113 
114         if (topology_depth > 2)
115                 printf(" PKG|");
116         if (topology_depth > 1)
117                 printf("CORE|");
118         if (topology_depth > 0)
119                 printf(" CPU|");
120 
121         for (mon = 0; mon < avail_monitors; mon++) {
122                 if (mon != 0)
123                         printf("||");
124                 for (state = 0; state < monitors[mon]->hw_states_num; state++) {
125                         if (state != 0)
126                                 printf("|");
127                         s = monitors[mon]->hw_states[state];
128                         sprintf(buf, "%s", s.name);
129                         fill_string_with_spaces(buf, MAX_COL_WIDTH);
130                         printf("%s", buf);
131                 }
132                 printf(" ");
133         }
134         printf("\n");
135 }
136 
137 
138 void print_results(int topology_depth, int cpu)
139 {
140         unsigned int mon;
141         int state, ret;
142         double percent;
143         unsigned long long result;
144         cstate_t s;
145 
146         /* Be careful CPUs may got resorted for pkg value do not just use cpu */
147         if (!bitmask_isbitset(cpus_chosen, cpu_top.core_info[cpu].cpu))
148                 return;
149         if (!cpu_top.core_info[cpu].is_online &&
150             cpu_top.core_info[cpu].pkg == -1)
151                 return;
152 
153         if (topology_depth > 2)
154                 printf("%4d|", cpu_top.core_info[cpu].pkg);
155         if (topology_depth > 1)
156                 printf("%4d|", cpu_top.core_info[cpu].core);
157         if (topology_depth > 0)
158                 printf("%4d|", cpu_top.core_info[cpu].cpu);
159 
160         for (mon = 0; mon < avail_monitors; mon++) {
161                 if (mon != 0)
162                         printf("||");
163 
164                 for (state = 0; state < monitors[mon]->hw_states_num; state++) {
165                         if (state != 0)
166                                 printf("|");
167 
168                         s = monitors[mon]->hw_states[state];
169 
170                         if (s.get_count_percent) {
171                                 ret = s.get_count_percent(s.id, &percent,
172                                                   cpu_top.core_info[cpu].cpu);
173                                 if (ret)
174                                         printf("******");
175                                 else if (percent >= 100.0)
176                                         printf("%6.1f", percent);
177                                 else
178                                         printf("%6.2f", percent);
179                         } else if (s.get_count) {
180                                 ret = s.get_count(s.id, &result,
181                                                   cpu_top.core_info[cpu].cpu);
182                                 if (ret)
183                                         printf("******");
184                                 else
185                                         printf("%6llu", result);
186                         } else {
187                                 printf(_("Monitor %s, Counter %s has no count "
188                                          "function. Implementation error\n"),
189                                        monitors[mon]->name, s.name);
190                                 exit(EXIT_FAILURE);
191                         }
192                 }
193         }
194         /*
195          * The monitor could still provide useful data, for example
196          * AMD HW counters partly sit in PCI config space.
197          * It's up to the monitor plug-in to check .is_online, this one
198          * is just for additional info.
199          */
200         if (!cpu_top.core_info[cpu].is_online &&
201             cpu_top.core_info[cpu].pkg != -1) {
202                 printf(_(" *is offline\n"));
203                 return;
204         } else
205                 printf("\n");
206 }
207 
208 
209 /* param: string passed by -m param (The list of monitors to show)
210  *
211  * Monitors must have been registered already, matching monitors
212  * are picked out and available monitors array is overridden
213  * with matching ones
214  *
215  * Monitors get sorted in the same order the user passes them
216 */
217 
218 static void parse_monitor_param(char *param)
219 {
220         unsigned int num;
221         int mon, hits = 0;
222         char *tmp = param, *token;
223         struct cpuidle_monitor *tmp_mons[MONITORS_MAX];
224 
225 
226         for (mon = 0; mon < MONITORS_MAX; mon++, tmp = NULL) {
227                 token = strtok(tmp, ",");
228                 if (token == NULL)
229                         break;
230                 if (strlen(token) >= MONITOR_NAME_LEN) {
231                         printf(_("%s: max monitor name length"
232                                  " (%d) exceeded\n"), token, MONITOR_NAME_LEN);
233                         continue;
234                 }
235 
236                 for (num = 0; num < avail_monitors; num++) {
237                         if (!strcmp(monitors[num]->name, token)) {
238                                 dprint("Found requested monitor: %s\n", token);
239                                 tmp_mons[hits] = monitors[num];
240                                 hits++;
241                         }
242                 }
243         }
244         if (hits == 0) {
245                 printf(_("No matching monitor found in %s, "
246                          "try -l option\n"), param);
247                 exit(EXIT_FAILURE);
248         }
249         /* Override detected/registerd monitors array with requested one */
250         memcpy(monitors, tmp_mons,
251                 sizeof(struct cpuidle_monitor *) * MONITORS_MAX);
252         avail_monitors = hits;
253 }
254 
255 void list_monitors(void)
256 {
257         unsigned int mon;
258         int state;
259         cstate_t s;
260 
261         for (mon = 0; mon < avail_monitors; mon++) {
262                 printf(_("Monitor \"%s\" (%d states) - Might overflow after %u "
263                          "s\n"),
264                         monitors[mon]->name, monitors[mon]->hw_states_num,
265                         monitors[mon]->overflow_s);
266 
267                 for (state = 0; state < monitors[mon]->hw_states_num; state++) {
268                         s = monitors[mon]->hw_states[state];
269                         /*
270                          * ToDo show more state capabilities:
271                          * percent, time (granlarity)
272                          */
273                         printf("%s\t[%c] -> %s\n", s.name, range_abbr[s.range],
274                                gettext(s.desc));
275                 }
276         }
277 }
278 
279 int fork_it(char **argv)
280 {
281         int status;
282         unsigned int num;
283         unsigned long long timediff;
284         pid_t child_pid;
285         struct timespec start, end;
286 
287         child_pid = fork();
288         clock_gettime(CLOCK_REALTIME, &start);
289 
290         for (num = 0; num < avail_monitors; num++)
291                 monitors[num]->start();
292 
293         if (!child_pid) {
294                 /* child */
295                 execvp(argv[0], argv);
296         } else {
297                 /* parent */
298                 if (child_pid == -1) {
299                         perror("fork");
300                         exit(1);
301                 }
302 
303                 signal(SIGINT, SIG_IGN);
304                 signal(SIGQUIT, SIG_IGN);
305                 if (waitpid(child_pid, &status, 0) == -1) {
306                         perror("wait");
307                         exit(1);
308                 }
309         }
310         clock_gettime(CLOCK_REALTIME, &end);
311         for (num = 0; num < avail_monitors; num++)
312                 monitors[num]->stop();
313 
314         timediff = timespec_diff_us(start, end);
315         if (WIFEXITED(status))
316                 printf(_("%s took %.5f seconds and exited with status %d\n"),
317                         argv[0], timediff / (1000.0 * 1000),
318                         WEXITSTATUS(status));
319         return 0;
320 }
321 
322 int do_interval_measure(int i)
323 {
324         unsigned int num;
325         int cpu;
326 
327         if (wake_cpus)
328                 for (cpu = 0; cpu < cpu_count; cpu++)
329                         bind_cpu(cpu);
330 
331         for (num = 0; num < avail_monitors; num++) {
332                 dprint("HW C-state residency monitor: %s - States: %d\n",
333                        monitors[num]->name, monitors[num]->hw_states_num);
334                 monitors[num]->start();
335         }
336 
337         sleep(i);
338 
339         if (wake_cpus)
340                 for (cpu = 0; cpu < cpu_count; cpu++)
341                         bind_cpu(cpu);
342 
343         for (num = 0; num < avail_monitors; num++)
344                 monitors[num]->stop();
345 
346 
347         return 0;
348 }
349 
350 static void cmdline(int argc, char *argv[])
351 {
352         int opt;
353         progname = basename(argv[0]);
354 
355         while ((opt = getopt(argc, argv, "+lci:m:")) != -1) {
356                 switch (opt) {
357                 case 'l':
358                         if (mode)
359                                 print_wrong_arg_exit();
360                         mode = list;
361                         break;
362                 case 'i':
363                         /* only allow -i with -m or no option */
364                         if (mode && mode != show)
365                                 print_wrong_arg_exit();
366                         interval = atoi(optarg);
367                         break;
368                 case 'm':
369                         if (mode)
370                                 print_wrong_arg_exit();
371                         mode = show;
372                         show_monitors_param = optarg;
373                         break;
374                 case 'c':
375                         wake_cpus = 1;
376                         break;
377                 default:
378                         print_wrong_arg_exit();
379                 }
380         }
381         if (!mode)
382                 mode = show_all;
383 }
384 
385 int cmd_monitor(int argc, char **argv)
386 {
387         unsigned int num;
388         struct cpuidle_monitor *test_mon;
389         int cpu;
390 
391         cmdline(argc, argv);
392         cpu_count = get_cpu_topology(&cpu_top);
393         if (cpu_count < 0) {
394                 printf(_("Cannot read number of available processors\n"));
395                 return EXIT_FAILURE;
396         }
397 
398         if (!cpu_top.core_info[0].is_online)
399                 printf("WARNING: at least one cpu is offline\n");
400 
401         /* Default is: monitor all CPUs */
402         if (bitmask_isallclear(cpus_chosen))
403                 bitmask_setall(cpus_chosen);
404 
405         dprint("System has up to %d CPU cores\n", cpu_count);
406 
407         for (num = 0; all_monitors[num]; num++) {
408                 dprint("Try to register: %s\n", all_monitors[num]->name);
409                 test_mon = all_monitors[num]->do_register();
410                 if (test_mon) {
411                         if (test_mon->needs_root && !run_as_root) {
412                                 fprintf(stderr, _("Available monitor %s needs "
413                                           "root access\n"), test_mon->name);
414                                 continue;
415                         }
416                         monitors[avail_monitors] = test_mon;
417                         dprint("%s registered\n", all_monitors[num]->name);
418                         avail_monitors++;
419                 }
420         }
421 
422         if (avail_monitors == 0) {
423                 printf(_("No HW Cstate monitors found\n"));
424                 return 1;
425         }
426 
427         if (mode == list) {
428                 list_monitors();
429                 exit(EXIT_SUCCESS);
430         }
431 
432         if (mode == show)
433                 parse_monitor_param(show_monitors_param);
434 
435         dprint("Packages: %d - Cores: %d - CPUs: %d\n",
436                cpu_top.pkgs, cpu_top.cores, cpu_count);
437 
438         /*
439          * if any params left, it must be a command to fork
440          */
441         if (argc - optind)
442                 fork_it(argv + optind);
443         else
444                 do_interval_measure(interval);
445 
446         /* ToDo: Topology parsing needs fixing first to do
447            this more generically */
448         if (cpu_top.pkgs > 1)
449                 print_header(3);
450         else
451                 print_header(1);
452 
453         for (cpu = 0; cpu < cpu_count; cpu++) {
454                 if (cpu_top.pkgs > 1)
455                         print_results(3, cpu);
456                 else
457                         print_results(1, cpu);
458         }
459 
460         for (num = 0; num < avail_monitors; num++)
461                 monitors[num]->unregister();
462 
463         cpu_topology_release(cpu_top);
464         return 0;
465 }
466 

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