irq.c 6.6 KB

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  1. /* irq.c
  2. * Parse IRQ-related files.
  3. */
  4. #include <stdlib.h>
  5. #include <stdio.h>
  6. #include <string.h>
  7. #include <sys/types.h>
  8. #include <dirent.h>
  9. #include <limits.h>
  10. #include <ctype.h>
  11. #include "lub/list.h"
  12. #include "irq.h"
  13. #include "pxm.h"
  14. #define STR(str) ( str ? str : "" )
  15. int irq_list_compare(const void *first, const void *second)
  16. {
  17. const irq_t *f = (const irq_t *)first;
  18. const irq_t *s = (const irq_t *)second;
  19. return (f->irq - s->irq);
  20. }
  21. static irq_t * irq_new(int num)
  22. {
  23. irq_t *new;
  24. if (!(new = malloc(sizeof(*new))))
  25. return NULL;
  26. new->irq = num;
  27. new->type = NULL;
  28. new->desc = NULL;
  29. new->refresh = 1;
  30. new->old_intr = 0;
  31. new->intr = 0;
  32. new->cpu = NULL;
  33. new->weight = 0;
  34. cpus_setall(new->local_cpus);
  35. cpus_clear(new->affinity);
  36. new->blacklisted = 0;
  37. return new;
  38. }
  39. static void irq_free(irq_t *irq)
  40. {
  41. free(irq->type);
  42. free(irq->desc);
  43. free(irq);
  44. }
  45. irq_t * irq_list_search(lub_list_t *irqs, unsigned int num)
  46. {
  47. lub_list_node_t *node;
  48. irq_t search;
  49. search.irq = num;
  50. node = lub_list_search(irqs, &search);
  51. if (!node)
  52. return NULL;
  53. return (irq_t *)lub_list_node__get_data(node);
  54. }
  55. static irq_t * irq_list_add(lub_list_t *irqs, unsigned int num)
  56. {
  57. lub_list_node_t *node;
  58. irq_t *new;
  59. irq_t search;
  60. search.irq = num;
  61. node = lub_list_search(irqs, &search);
  62. if (node) /* IRQ already exists. May be renew some fields later */
  63. return (irq_t *)lub_list_node__get_data(node);
  64. if (!(new = irq_new(num)))
  65. return NULL;
  66. lub_list_add(irqs, new);
  67. return new;
  68. }
  69. int irq_list_free(lub_list_t *irqs)
  70. {
  71. lub_list_node_t *iter;
  72. while ((iter = lub_list__get_head(irqs))) {
  73. irq_t *irq;
  74. irq = (irq_t *)lub_list_node__get_data(iter);
  75. irq_free(irq);
  76. lub_list_del(irqs, iter);
  77. lub_list_node_free(iter);
  78. }
  79. lub_list_free(irqs);
  80. return 0;
  81. }
  82. /* Show IRQ information */
  83. static void irq_show(irq_t *irq)
  84. {
  85. char buf[NR_CPUS + 1];
  86. if (cpus_full(irq->local_cpus))
  87. snprintf(buf, sizeof(buf), "*");
  88. else
  89. cpumask_scnprintf(buf, sizeof(buf), irq->local_cpus);
  90. printf("IRQ %3d %s [%s] %s\n", irq->irq, buf, STR(irq->type), STR(irq->desc));
  91. }
  92. /* Show IRQ list */
  93. int irq_list_show(lub_list_t *irqs)
  94. {
  95. lub_list_node_t *iter;
  96. for (iter = lub_list_iterator_init(irqs); iter;
  97. iter = lub_list_iterator_next(iter)) {
  98. irq_t *irq;
  99. irq = (irq_t *)lub_list_node__get_data(iter);
  100. irq_show(irq);
  101. }
  102. return 0;
  103. }
  104. static int parse_local_cpus(lub_list_t *irqs, const char *sysfs_path,
  105. unsigned int num, lub_list_t *pxms)
  106. {
  107. char path[PATH_MAX];
  108. FILE *fd;
  109. char *str = NULL;
  110. size_t sz;
  111. cpumask_t local_cpus;
  112. irq_t *irq = NULL;
  113. cpumask_t cpumask;
  114. irq = irq_list_search(irqs, num);
  115. if (!irq)
  116. return -1;
  117. /* Find proximity in config file. */
  118. if (!pxm_search(pxms, sysfs_path, &cpumask)) {
  119. irq->local_cpus = cpumask;
  120. return 0;
  121. }
  122. sprintf(path, "%s/%s/local_cpus", SYSFS_PCI_PATH, sysfs_path);
  123. if (!(fd = fopen(path, "r")))
  124. return -1;
  125. if (getline(&str, &sz, fd) < 0) {
  126. fclose(fd);
  127. return -1;
  128. }
  129. fclose(fd);
  130. cpumask_parse_user(str, strlen(str), local_cpus);
  131. cpus_and(irq->local_cpus, irq->local_cpus, local_cpus);
  132. free(str);
  133. return 0;
  134. }
  135. static int parse_sysfs(lub_list_t *irqs, lub_list_t *pxms)
  136. {
  137. DIR *dir;
  138. DIR *msi;
  139. struct dirent *dent;
  140. struct dirent *ment;
  141. FILE *fd;
  142. char path[PATH_MAX];
  143. int num;
  144. /* Now we can parse PCI devices only */
  145. /* Get info from /sys/bus/pci/devices */
  146. dir = opendir(SYSFS_PCI_PATH);
  147. if (!dir)
  148. return -1;
  149. while((dent = readdir(dir))) {
  150. if (!strcmp(dent->d_name, ".") ||
  151. !strcmp(dent->d_name, ".."))
  152. continue;
  153. /* Search for MSI IRQs. Since linux-3.2 */
  154. sprintf(path, "%s/%s/msi_irqs", SYSFS_PCI_PATH, dent->d_name);
  155. if ((msi = opendir(path))) {
  156. while((ment = readdir(msi))) {
  157. if (!strcmp(ment->d_name, ".") ||
  158. !strcmp(ment->d_name, ".."))
  159. continue;
  160. num = strtol(ment->d_name, NULL, 10);
  161. if (!num)
  162. continue;
  163. parse_local_cpus(irqs, dent->d_name, num, pxms);
  164. }
  165. closedir(msi);
  166. continue;
  167. }
  168. /* Try to get IRQ number from irq file */
  169. sprintf(path, "%s/%s/irq", SYSFS_PCI_PATH, dent->d_name);
  170. if (!(fd = fopen(path, "r")))
  171. continue;
  172. if (fscanf(fd, "%d", &num) < 0) {
  173. fclose(fd);
  174. continue;
  175. }
  176. fclose(fd);
  177. if (!num)
  178. continue;
  179. parse_local_cpus(irqs, dent->d_name, num, pxms);
  180. }
  181. closedir(dir);
  182. return 0;
  183. }
  184. int irq_get_affinity(irq_t *irq)
  185. {
  186. char path[PATH_MAX];
  187. FILE *fd;
  188. char *str = NULL;
  189. size_t sz;
  190. if (!irq)
  191. return -1;
  192. sprintf(path, "%s/%u/smp_affinity", PROC_IRQ, irq->irq);
  193. if (!(fd = fopen(path, "r")))
  194. return -1;
  195. if (getline(&str, &sz, fd) < 0) {
  196. fclose(fd);
  197. return -1;
  198. }
  199. fclose(fd);
  200. cpumask_parse_user(str, strlen(str), irq->affinity);
  201. free(str);
  202. return 0;
  203. }
  204. /* Parse /proc/interrupts to get actual IRQ list */
  205. int scan_irqs(lub_list_t *irqs, lub_list_t *balance_irqs, lub_list_t *pxms)
  206. {
  207. FILE *fd;
  208. unsigned int num;
  209. char *str = NULL;
  210. size_t sz;
  211. irq_t *irq;
  212. lub_list_node_t *iter;
  213. if (!(fd = fopen(PROC_INTERRUPTS, "r")))
  214. return -1;
  215. while(getline(&str, &sz, fd) >= 0) {
  216. char *endptr, *tok;
  217. int new = 0;
  218. num = strtoul(str, &endptr, 10);
  219. if (endptr == str)
  220. continue;
  221. if (!(irq = irq_list_search(irqs, num))) {
  222. new = 1;
  223. irq = irq_list_add(irqs, num);
  224. }
  225. /* Set refresh flag because IRQ was found */
  226. irq->refresh = 1;
  227. /* Doesn't refresh info for blacklisted IRQs */
  228. if (irq->blacklisted)
  229. continue;
  230. /* Find IRQ type - first non-digital and non-space */
  231. while (*endptr && !isalpha(*endptr))
  232. endptr++;
  233. tok = endptr; /* It will be IRQ type */
  234. while (*endptr && !isblank(*endptr))
  235. endptr++;
  236. free(irq->type);
  237. irq->type = strndup(tok, endptr - tok);
  238. /* Find IRQ devices list */
  239. while (*endptr && !isalpha(*endptr))
  240. endptr++;
  241. tok = endptr; /* It will be device list */
  242. while (*endptr && !iscntrl(*endptr))
  243. endptr++;
  244. free(irq->desc);
  245. irq->desc = strndup(tok, endptr - tok);
  246. if (new) {
  247. /* By default all CPUs are local for IRQ. Real local
  248. CPUs will be find while sysfs scan. */
  249. cpus_setall(irq->local_cpus);
  250. irq_get_affinity(irq);
  251. lub_list_add(balance_irqs, irq);
  252. printf("Add IRQ %3d %s\n", irq->irq, STR(irq->desc));
  253. }
  254. }
  255. free(str);
  256. fclose(fd);
  257. /* Remove disapeared IRQs */
  258. iter = lub_list_iterator_init(irqs);
  259. while(iter) {
  260. irq_t *irq;
  261. lub_list_node_t *old_iter;
  262. irq = (irq_t *)lub_list_node__get_data(iter);
  263. old_iter = iter;
  264. iter = lub_list_iterator_next(iter);
  265. if (!irq->refresh) {
  266. lub_list_del(irqs, old_iter);
  267. irq_free(irq);
  268. printf("Remove IRQ %3d %s\n", irq->irq, STR(irq->desc));
  269. } else {
  270. /* Drop refresh flag for next iteration */
  271. irq->refresh = 0;
  272. }
  273. }
  274. /* No new IRQs were found. It doesn't need to scan sysfs. */
  275. if (lub_list_len(balance_irqs) == 0)
  276. return 0;
  277. /* Add IRQ info from sysfs */
  278. parse_sysfs(irqs, pxms);
  279. return 0;
  280. }