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2024-10-22 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5 
 kernel/samples/bpf/trace_event_user.c
....@@ -1,30 +1,27 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /* Copyright (c) 2016 Facebook
2
- *
3
- * This program is free software; you can redistribute it and/or
4
- * modify it under the terms of version 2 of the GNU General Public
5
- * License as published by the Free Software Foundation.
63  */
74 #include <stdio.h>
85 #include <unistd.h>
96 #include <stdlib.h>
107 #include <stdbool.h>
118 #include <string.h>
12
-#include <fcntl.h>
13
-#include <poll.h>
14
-#include <sys/ioctl.h>
159 #include <linux/perf_event.h>
1610 #include <linux/bpf.h>
1711 #include <signal.h>
18
-#include <assert.h>
1912 #include <errno.h>
2013 #include <sys/resource.h>
21
-#include "libbpf.h"
22
-#include "bpf_load.h"
14
+#include <bpf/bpf.h>
15
+#include <bpf/libbpf.h>
2316 #include "perf-sys.h"
2417 #include "trace_helpers.h"
2518 
2619 #define SAMPLE_FREQ 50
2720 
21
+static int pid;
22
+/* counts, stackmap */
23
+static int map_fd[2];
24
+struct bpf_program *prog;
2825 static bool sys_read_seen, sys_write_seen;
2926 
3027 static void print_ksym(__u64 addr)
....@@ -34,6 +31,11 @@
3431 	if (!addr)
3532 		return;
3633 	sym = ksym_search(addr);
34
+	if (!sym) {
35
+		printf("ksym not found. Is kallsyms loaded?\n");
36
+		return;
37
+	}
38
+
3739 	printf("%s;", sym->name);
3840 	if (!strstr(sym->name, "sys_read"))
3941 		sys_read_seen = true;
....@@ -89,10 +91,10 @@
8991 	}
9092 }
9193 
92
-static void int_exit(int sig)
94
+static void err_exit(int err)
9395 {
94
-	kill(0, SIGKILL);
95
-	exit(0);
96
+	kill(pid, SIGKILL);
97
+	exit(err);
9698 }
9799 
98100 static void print_stacks(void)
....@@ -100,7 +102,7 @@
100102 	struct key_t key = {}, next_key;
101103 	__u64 value;
102104 	__u32 stackid = 0, next_id;
103
-	int fd = map_fd[0], stack_map = map_fd[1];
105
+	int error = 1, fd = map_fd[0], stack_map = map_fd[1];
104106 
105107 	sys_read_seen = sys_write_seen = false;
106108 	while (bpf_map_get_next_key(fd, &key, &next_key) == 0) {
....@@ -112,7 +114,7 @@
112114 	printf("\n");
113115 	if (!sys_read_seen || !sys_write_seen) {
114116 		printf("BUG kernel stack doesn't contain sys_read() and sys_write()\n");
115
-		int_exit(0);
117
+		err_exit(error);
116118 	}
117119 
118120 	/* clear stack map */
....@@ -134,43 +136,52 @@
134136 
135137 static void test_perf_event_all_cpu(struct perf_event_attr *attr)
136138 {
137
-	int nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
138
-	int *pmu_fd = malloc(nr_cpus * sizeof(int));
139
-	int i, error = 0;
139
+	int nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
140
+	struct bpf_link **links = calloc(nr_cpus, sizeof(struct bpf_link *));
141
+	int i, pmu_fd, error = 1;
142
+
143
+	if (!links) {
144
+		printf("malloc of links failed\n");
145
+		goto err;
146
+	}
140147 
141148 	/* system wide perf event, no need to inherit */
142149 	attr->inherit = 0;
143150 
144151 	/* open perf_event on all cpus */
145152 	for (i = 0; i < nr_cpus; i++) {
146
-		pmu_fd[i] = sys_perf_event_open(attr, -1, i, -1, 0);
147
-		if (pmu_fd[i] < 0) {
153
+		pmu_fd = sys_perf_event_open(attr, -1, i, -1, 0);
154
+		if (pmu_fd < 0) {
148155 			printf("sys_perf_event_open failed\n");
149
-			error = 1;
150156 			goto all_cpu_err;
151157 		}
152
-		assert(ioctl(pmu_fd[i], PERF_EVENT_IOC_SET_BPF, prog_fd[0]) == 0);
153
-		assert(ioctl(pmu_fd[i], PERF_EVENT_IOC_ENABLE) == 0);
158
+		links[i] = bpf_program__attach_perf_event(prog, pmu_fd);
159
+		if (libbpf_get_error(links[i])) {
160
+			printf("bpf_program__attach_perf_event failed\n");
161
+			links[i] = NULL;
162
+			close(pmu_fd);
163
+			goto all_cpu_err;
164
+		}
154165 	}
155166 
156
-	if (generate_load() < 0) {
157
-		error = 1;
167
+	if (generate_load() < 0)
158168 		goto all_cpu_err;
159
-	}
169
+
160170 	print_stacks();
171
+	error = 0;
161172 all_cpu_err:
162
-	for (i--; i >= 0; i--) {
163
-		ioctl(pmu_fd[i], PERF_EVENT_IOC_DISABLE);
164
-		close(pmu_fd[i]);
165
-	}
166
-	free(pmu_fd);
173
+	for (i--; i >= 0; i--)
174
+		bpf_link__destroy(links[i]);
175
+err:
176
+	free(links);
167177 	if (error)
168
-		int_exit(0);
178
+		err_exit(error);
169179 }
170180 
171181 static void test_perf_event_task(struct perf_event_attr *attr)
172182 {
173
-	int pmu_fd, error = 0;
183
+	struct bpf_link *link = NULL;
184
+	int pmu_fd, error = 1;
174185 
175186 	/* per task perf event, enable inherit so the "dd ..." command can be traced properly.
176187 	 * Enabling inherit will cause bpf_perf_prog_read_time helper failure.
....@@ -181,21 +192,25 @@
181192 	pmu_fd = sys_perf_event_open(attr, 0, -1, -1, 0);
182193 	if (pmu_fd < 0) {
183194 		printf("sys_perf_event_open failed\n");
184
-		int_exit(0);
185
-	}
186
-	assert(ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd[0]) == 0);
187
-	assert(ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE) == 0);
188
-
189
-	if (generate_load() < 0) {
190
-		error = 1;
191195 		goto err;
192196 	}
197
+	link = bpf_program__attach_perf_event(prog, pmu_fd);
198
+	if (libbpf_get_error(link)) {
199
+		printf("bpf_program__attach_perf_event failed\n");
200
+		link = NULL;
201
+		close(pmu_fd);
202
+		goto err;
203
+	}
204
+
205
+	if (generate_load() < 0)
206
+		goto err;
207
+
193208 	print_stacks();
209
+	error = 0;
194210 err:
195
-	ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE);
196
-	close(pmu_fd);
211
+	bpf_link__destroy(link);
197212 	if (error)
198
-		int_exit(0);
213
+		err_exit(error);
199214 }
200215 
201216 static void test_bpf_perf_event(void)
....@@ -280,29 +295,60 @@
280295 int main(int argc, char **argv)
281296 {
282297 	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
298
+	struct bpf_object *obj = NULL;
283299 	char filename[256];
300
+	int error = 1;
284301 
285302 	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
286303 	setrlimit(RLIMIT_MEMLOCK, &r);
287304 
288
-	signal(SIGINT, int_exit);
289
-	signal(SIGTERM, int_exit);
305
+	signal(SIGINT, err_exit);
306
+	signal(SIGTERM, err_exit);
290307 
291308 	if (load_kallsyms()) {
292309 		printf("failed to process /proc/kallsyms\n");
293
-		return 1;
310
+		goto cleanup;
294311 	}
295312 
296
-	if (load_bpf_file(filename)) {
297
-		printf("%s", bpf_log_buf);
298
-		return 2;
313
+	obj = bpf_object__open_file(filename, NULL);
314
+	if (libbpf_get_error(obj)) {
315
+		printf("opening BPF object file failed\n");
316
+		obj = NULL;
317
+		goto cleanup;
299318 	}
300319 
301
-	if (fork() == 0) {
320
+	prog = bpf_object__find_program_by_name(obj, "bpf_prog1");
321
+	if (!prog) {
322
+		printf("finding a prog in obj file failed\n");
323
+		goto cleanup;
324
+	}
325
+
326
+	/* load BPF program */
327
+	if (bpf_object__load(obj)) {
328
+		printf("loading BPF object file failed\n");
329
+		goto cleanup;
330
+	}
331
+
332
+	map_fd[0] = bpf_object__find_map_fd_by_name(obj, "counts");
333
+	map_fd[1] = bpf_object__find_map_fd_by_name(obj, "stackmap");
334
+	if (map_fd[0] < 0 || map_fd[1] < 0) {
335
+		printf("finding a counts/stackmap map in obj file failed\n");
336
+		goto cleanup;
337
+	}
338
+
339
+	pid = fork();
340
+	if (pid == 0) {
302341 		read_trace_pipe();
303342 		return 0;
343
+	} else if (pid == -1) {
344
+		printf("couldn't spawn process\n");
345
+		goto cleanup;
304346 	}
347
+
305348 	test_bpf_perf_event();
306
-	int_exit(0);
307
-	return 0;
349
+	error = 0;
350
+
351
+cleanup:
352
+	bpf_object__close(obj);
353
+	err_exit(error);
308354 }