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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/tools/lib/traceevent/event-plugin.c
..
..
@@ -13,8 +13,11 @@
13
13
 #include <sys/stat.h>
14
14
 #include <unistd.h>
15
15
 #include <dirent.h>
16
+#include <errno.h>
16
17
 #include "event-parse.h"
18
+#include "event-parse-local.h"
17
19
 #include "event-utils.h"
20
+#include "trace-seq.h"
18
21
 
19
22
 #define LOCAL_PLUGIN_DIR ".local/lib/traceevent/plugins/"
20
23
 
..
..
@@ -30,10 +33,16 @@
30
33
 	char				*value;
31
34
 } *trace_plugin_options;
32
35
 
33
-struct plugin_list {
34
-	struct plugin_list	*next;
36
+struct tep_plugin_list {
37
+	struct tep_plugin_list	*next;
35
38
 	char			*name;
36
39
 	void			*handle;
40
+};
41
+
42
+struct tep_plugins_dir {
43
+	struct tep_plugins_dir		*next;
44
+	char				*path;
45
+	enum tep_plugin_load_priority	prio;
37
46
 };
38
47
 
39
48
 static void lower_case(char *str)
..
..
@@ -245,6 +254,170 @@
245
254
 	}
246
255
 }
247
256
 
257
+static int parse_option_name(char **option, char **plugin)
258
+{
259
+	char *p;
260
+
261
+	*plugin = NULL;
262
+
263
+	if ((p = strstr(*option, ":"))) {
264
+		*plugin = *option;
265
+		*p = '\0';
266
+		*option = strdup(p + 1);
267
+		if (!*option)
268
+			return -1;
269
+	}
270
+	return 0;
271
+}
272
+
273
+static struct tep_plugin_option *
274
+find_registered_option(const char *plugin, const char *option)
275
+{
276
+	struct registered_plugin_options *reg;
277
+	struct tep_plugin_option *op;
278
+	const char *op_plugin;
279
+
280
+	for (reg = registered_options; reg; reg = reg->next) {
281
+		for (op = reg->options; op->name; op++) {
282
+			if (op->plugin_alias)
283
+				op_plugin = op->plugin_alias;
284
+			else
285
+				op_plugin = op->file;
286
+
287
+			if (plugin && strcmp(plugin, op_plugin) != 0)
288
+				continue;
289
+			if (strcmp(option, op->name) != 0)
290
+				continue;
291
+
292
+			return op;
293
+		}
294
+	}
295
+
296
+	return NULL;
297
+}
298
+
299
+static int process_option(const char *plugin, const char *option, const char *val)
300
+{
301
+	struct tep_plugin_option *op;
302
+
303
+	op = find_registered_option(plugin, option);
304
+	if (!op)
305
+		return 0;
306
+
307
+	return update_option_value(op, val);
308
+}
309
+
310
+/**
311
+ * tep_plugin_add_option - add an option/val pair to set plugin options
312
+ * @name: The name of the option (format: <plugin>:<option> or just <option>)
313
+ * @val: (optional) the value for the option
314
+ *
315
+ * Modify a plugin option. If @val is given than the value of the option
316
+ * is set (note, some options just take a boolean, so @val must be either
317
+ * "1" or "0" or "true" or "false").
318
+ */
319
+int tep_plugin_add_option(const char *name, const char *val)
320
+{
321
+	struct trace_plugin_options *op;
322
+	char *option_str;
323
+	char *plugin;
324
+
325
+	option_str = strdup(name);
326
+	if (!option_str)
327
+		return -ENOMEM;
328
+
329
+	if (parse_option_name(&option_str, &plugin) < 0)
330
+		return -ENOMEM;
331
+
332
+	/* If the option exists, update the val */
333
+	for (op = trace_plugin_options; op; op = op->next) {
334
+		/* Both must be NULL or not NULL */
335
+		if ((!plugin || !op->plugin) && plugin != op->plugin)
336
+			continue;
337
+		if (plugin && strcmp(plugin, op->plugin) != 0)
338
+			continue;
339
+		if (strcmp(op->option, option_str) != 0)
340
+			continue;
341
+
342
+		/* update option */
343
+		free(op->value);
344
+		if (val) {
345
+			op->value = strdup(val);
346
+			if (!op->value)
347
+				goto out_free;
348
+		} else
349
+			op->value = NULL;
350
+
351
+		/* plugin and option_str don't get freed at the end */
352
+		free(plugin);
353
+		free(option_str);
354
+
355
+		plugin = op->plugin;
356
+		option_str = op->option;
357
+		break;
358
+	}
359
+
360
+	/* If not found, create */
361
+	if (!op) {
362
+		op = malloc(sizeof(*op));
363
+		if (!op)
364
+			goto out_free;
365
+		memset(op, 0, sizeof(*op));
366
+		op->plugin = plugin;
367
+		op->option = option_str;
368
+		if (val) {
369
+			op->value = strdup(val);
370
+			if (!op->value) {
371
+				free(op);
372
+				goto out_free;
373
+			}
374
+		}
375
+		op->next = trace_plugin_options;
376
+		trace_plugin_options = op;
377
+	}
378
+
379
+	return process_option(plugin, option_str, val);
380
+
381
+out_free:
382
+	free(plugin);
383
+	free(option_str);
384
+	return -ENOMEM;
385
+}
386
+
387
+static void print_op_data(struct trace_seq *s, const char *name,
388
+			  const char *op)
389
+{
390
+	if (op)
391
+		trace_seq_printf(s, "%8s:\t%s\n", name, op);
392
+}
393
+
394
+/**
395
+ * tep_plugin_print_options - print out the registered plugin options
396
+ * @s: The trace_seq descriptor to write the plugin options into
397
+ *
398
+ * Writes a list of options into trace_seq @s.
399
+ */
400
+void tep_plugin_print_options(struct trace_seq *s)
401
+{
402
+	struct registered_plugin_options *reg;
403
+	struct tep_plugin_option *op;
404
+
405
+	for (reg = registered_options; reg; reg = reg->next) {
406
+		if (reg != registered_options)
407
+			trace_seq_printf(s, "============\n");
408
+		for (op = reg->options; op->name; op++) {
409
+			if (op != reg->options)
410
+				trace_seq_printf(s, "------------\n");
411
+			print_op_data(s, "file", op->file);
412
+			print_op_data(s, "plugin", op->plugin_alias);
413
+			print_op_data(s, "option", op->name);
414
+			print_op_data(s, "desc", op->description);
415
+			print_op_data(s, "value", op->value);
416
+			trace_seq_printf(s, "%8s:\t%d\n", "set", op->set);
417
+		}
418
+	}
419
+}
420
+
248
421
 /**
249
422
  * tep_print_plugins - print out the list of plugins loaded
250
423
  * @s: the trace_seq descripter to write to
..
..
@@ -258,7 +431,7 @@
258
431
  */
259
432
 void tep_print_plugins(struct trace_seq *s,
260
433
 		       const char *prefix, const char *suffix,
261
-		       const struct plugin_list *list)
434
+		       const struct tep_plugin_list *list)
262
435
 {
263
436
 	while (list) {
264
437
 		trace_seq_printf(s, "%s%s%s", prefix, list->name, suffix);
..
..
@@ -267,12 +440,13 @@
267
440
 }
268
441
 
269
442
 static void
270
-load_plugin(struct tep_handle *pevent, const char *path,
443
+load_plugin(struct tep_handle *tep, const char *path,
271
444
 	    const char *file, void *data)
272
445
 {
273
-	struct plugin_list **plugin_list = data;
446
+	struct tep_plugin_list **plugin_list = data;
447
+	struct tep_plugin_option *options;
274
448
 	tep_plugin_load_func func;
275
-	struct plugin_list *list;
449
+	struct tep_plugin_list *list;
276
450
 	const char *alias;
277
451
 	char *plugin;
278
452
 	void *handle;
..
..
@@ -295,6 +469,16 @@
295
469
 	if (!alias)
296
470
 		alias = file;
297
471
 
472
+	options = dlsym(handle, TEP_PLUGIN_OPTIONS_NAME);
473
+	if (options) {
474
+		while (options->name) {
475
+			ret = update_option(alias, options);
476
+			if (ret < 0)
477
+				goto out_free;
478
+			options++;
479
+		}
480
+	}
481
+
298
482
 	func = dlsym(handle, TEP_PLUGIN_LOADER_NAME);
299
483
 	if (!func) {
300
484
 		warning("could not find func '%s' in plugin '%s'\n%s\n",
..
..
@@ -314,7 +498,7 @@
314
498
 	*plugin_list = list;
315
499
 
316
500
 	pr_stat("registering plugin: %s", plugin);
317
-	func(pevent);
501
+	func(tep);
318
502
 	return;
319
503
 
320
504
  out_free:
..
..
@@ -322,9 +506,9 @@
322
506
 }
323
507
 
324
508
 static void
325
-load_plugins_dir(struct tep_handle *pevent, const char *suffix,
509
+load_plugins_dir(struct tep_handle *tep, const char *suffix,
326
510
 		 const char *path,
327
-		 void (*load_plugin)(struct tep_handle *pevent,
511
+		 void (*load_plugin)(struct tep_handle *tep,
328
512
 				     const char *path,
329
513
 				     const char *name,
330
514
 				     void *data),
..
..
@@ -357,35 +541,60 @@
357
541
 		if (strcmp(name + (strlen(name) - strlen(suffix)), suffix) != 0)
358
542
 			continue;
359
543
 
360
-		load_plugin(pevent, path, name, data);
544
+		load_plugin(tep, path, name, data);
361
545
 	}
362
546
 
363
547
 	closedir(dir);
364
548
 }
365
549
 
366
-static void
367
-load_plugins(struct tep_handle *pevent, const char *suffix,
368
-	     void (*load_plugin)(struct tep_handle *pevent,
369
-				 const char *path,
370
-				 const char *name,
371
-				 void *data),
372
-	     void *data)
550
+/**
551
+ * tep_load_plugins_hook - call a user specified callback to load a plugin
552
+ * @tep: handler to traceevent context
553
+ * @suffix: filter only plugin files with given suffix
554
+ * @load_plugin: user specified callback, called for each plugin file
555
+ * @data: custom context, passed to @load_plugin
556
+ *
557
+ * Searches for traceevent plugin files and calls @load_plugin for each
558
+ * The order of plugins search is:
559
+ *  - Directories, specified in @tep->plugins_dir and priority TEP_PLUGIN_FIRST
560
+ *  - Directory, specified at compile time with PLUGIN_TRACEEVENT_DIR
561
+ *  - Directory, specified by environment variable TRACEEVENT_PLUGIN_DIR
562
+ *  - In user's home: ~/.local/lib/traceevent/plugins/
563
+ *  - Directories, specified in @tep->plugins_dir and priority TEP_PLUGIN_LAST
564
+ *
565
+ */
566
+void tep_load_plugins_hook(struct tep_handle *tep, const char *suffix,
567
+			   void (*load_plugin)(struct tep_handle *tep,
568
+					       const char *path,
569
+					       const char *name,
570
+					       void *data),
571
+			   void *data)
373
572
 {
573
+	struct tep_plugins_dir *dir = NULL;
374
574
 	char *home;
375
575
 	char *path;
376
576
 	char *envdir;
377
577
 	int ret;
378
578
 
379
-	if (pevent->flags & TEP_DISABLE_PLUGINS)
579
+	if (tep && tep->flags & TEP_DISABLE_PLUGINS)
380
580
 		return;
581
+
582
+	if (tep)
583
+		dir = tep->plugins_dir;
584
+	while (dir) {
585
+		if (dir->prio == TEP_PLUGIN_FIRST)
586
+			load_plugins_dir(tep, suffix, dir->path,
587
+					 load_plugin, data);
588
+		dir = dir->next;
589
+	}
381
590
 
382
591
 	/*
383
592
 	 * If a system plugin directory was defined,
384
593
 	 * check that first.
385
594
 	 */
386
595
 #ifdef PLUGIN_DIR
387
-	if (!(pevent->flags & TEP_DISABLE_SYS_PLUGINS))
388
-		load_plugins_dir(pevent, suffix, PLUGIN_DIR,
596
+	if (!tep || !(tep->flags & TEP_DISABLE_SYS_PLUGINS))
597
+		load_plugins_dir(tep, suffix, PLUGIN_DIR,
389
598
 				 load_plugin, data);
390
599
 #endif
391
600
 
..
..
@@ -395,7 +604,7 @@
395
604
 	 */
396
605
 	envdir = getenv("TRACEEVENT_PLUGIN_DIR");
397
606
 	if (envdir)
398
-		load_plugins_dir(pevent, suffix, envdir, load_plugin, data);
607
+		load_plugins_dir(tep, suffix, envdir, load_plugin, data);
399
608
 
400
609
 	/*
401
610
 	 * Now let the home directory override the environment
..
..
@@ -411,32 +620,90 @@
411
620
 		return;
412
621
 	}
413
622
 
414
-	load_plugins_dir(pevent, suffix, path, load_plugin, data);
623
+	load_plugins_dir(tep, suffix, path, load_plugin, data);
624
+
625
+	if (tep)
626
+		dir = tep->plugins_dir;
627
+	while (dir) {
628
+		if (dir->prio == TEP_PLUGIN_LAST)
629
+			load_plugins_dir(tep, suffix, dir->path,
630
+					 load_plugin, data);
631
+		dir = dir->next;
632
+	}
415
633
 
416
634
 	free(path);
417
635
 }
418
636
 
419
-struct plugin_list*
420
-tep_load_plugins(struct tep_handle *pevent)
637
+struct tep_plugin_list*
638
+tep_load_plugins(struct tep_handle *tep)
421
639
 {
422
-	struct plugin_list *list = NULL;
640
+	struct tep_plugin_list *list = NULL;
423
641
 
424
-	load_plugins(pevent, ".so", load_plugin, &list);
642
+	tep_load_plugins_hook(tep, ".so", load_plugin, &list);
425
643
 	return list;
426
644
 }
427
645
 
646
+/**
647
+ * tep_add_plugin_path - Add a new plugin directory.
648
+ * @tep: Trace event handler.
649
+ * @path: Path to a directory. All plugin files in that
650
+ *	  directory will be loaded.
651
+ *@prio: Load priority of the plugins in that directory.
652
+ *
653
+ * Returns -1 in case of an error, 0 otherwise.
654
+ */
655
+int tep_add_plugin_path(struct tep_handle *tep, char *path,
656
+			enum tep_plugin_load_priority prio)
657
+{
658
+	struct tep_plugins_dir *dir;
659
+
660
+	if (!tep || !path)
661
+		return -1;
662
+
663
+	dir = calloc(1, sizeof(*dir));
664
+	if (!dir)
665
+		return -1;
666
+
667
+	dir->path = strdup(path);
668
+	if (!dir->path) {
669
+		free(dir);
670
+		return -1;
671
+	}
672
+	dir->prio = prio;
673
+	dir->next = tep->plugins_dir;
674
+	tep->plugins_dir = dir;
675
+
676
+	return 0;
677
+}
678
+
679
+__hidden void free_tep_plugin_paths(struct tep_handle *tep)
680
+{
681
+	struct tep_plugins_dir *dir;
682
+
683
+	if (!tep)
684
+		return;
685
+
686
+	dir = tep->plugins_dir;
687
+	while (dir) {
688
+		tep->plugins_dir = tep->plugins_dir->next;
689
+		free(dir->path);
690
+		free(dir);
691
+		dir = tep->plugins_dir;
692
+	}
693
+}
694
+
428
695
 void
429
-tep_unload_plugins(struct plugin_list *plugin_list, struct tep_handle *pevent)
696
+tep_unload_plugins(struct tep_plugin_list *plugin_list, struct tep_handle *tep)
430
697
 {
431
698
 	tep_plugin_unload_func func;
432
-	struct plugin_list *list;
699
+	struct tep_plugin_list *list;
433
700
 
434
701
 	while (plugin_list) {
435
702
 		list = plugin_list;
436
703
 		plugin_list = list->next;
437
704
 		func = dlsym(list->handle, TEP_PLUGIN_UNLOADER_NAME);
438
705
 		if (func)
439
-			func(pevent);
706
+			func(tep);
440
707
 		dlclose(list->handle);
441
708
 		free(list->name);
442
709
 		free(list);