disable pwm7

hc

2024-05-10 23fa18eaa71266feff7ba8d83022d9e1cc83c65a

 kernel/samples/bpf/sampleip_user.c
..
..
@@ -1,26 +1,20 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
1
2
 /*
2
3
  * sampleip: sample instruction pointer and frequency count in a BPF map.
3
4
  *
4
5
  * Copyright 2016 Netflix, Inc.
5
- *
6
- * This program is free software; you can redistribute it and/or
7
- * modify it under the terms of version 2 of the GNU General Public
8
- * License as published by the Free Software Foundation.
9
6
  */
10
7
 #include <stdio.h>
11
8
 #include <stdlib.h>
12
-#include <stdio.h>
13
9
 #include <unistd.h>
14
10
 #include <errno.h>
15
11
 #include <signal.h>
16
12
 #include <string.h>
17
-#include <assert.h>
18
13
 #include <linux/perf_event.h>
19
14
 #include <linux/ptrace.h>
20
15
 #include <linux/bpf.h>
21
-#include <sys/ioctl.h>
22
-#include "libbpf.h"
23
-#include "bpf_load.h"
16
+#include <bpf/bpf.h>
17
+#include <bpf/libbpf.h>
24
18
 #include "perf-sys.h"
25
19
 #include "trace_helpers.h"
26
20
 
..
..
@@ -29,6 +23,7 @@
29
23
 #define MAX_IPS		8192
30
24
 #define PAGE_OFFSET	0xffff880000000000
31
25
 
26
+static int map_fd;
32
27
 static int nr_cpus;
33
28
 
34
29
 static void usage(void)
..
..
@@ -38,9 +33,10 @@
38
33
 	printf("       duration   # sampling duration (seconds), default 5\n");
39
34
 }
40
35
 
41
-static int sampling_start(int *pmu_fd, int freq)
36
+static int sampling_start(int freq, struct bpf_program *prog,
37
+			  struct bpf_link *links[])
42
38
 {
43
-	int i;
39
+	int i, pmu_fd;
44
40
 
45
41
 	struct perf_event_attr pe_sample_attr = {
46
42
 		.type = PERF_TYPE_SOFTWARE,
..
..
@@ -51,26 +47,30 @@
51
47
 	};
52
48
 
53
49
 	for (i = 0; i < nr_cpus; i++) {
54
-		pmu_fd[i] = sys_perf_event_open(&pe_sample_attr, -1 /* pid */, i,
50
+		pmu_fd = sys_perf_event_open(&pe_sample_attr, -1 /* pid */, i,
55
51
 					    -1 /* group_fd */, 0 /* flags */);
56
-		if (pmu_fd[i] < 0) {
52
+		if (pmu_fd < 0) {
57
53
 			fprintf(stderr, "ERROR: Initializing perf sampling\n");
58
54
 			return 1;
59
55
 		}
60
-		assert(ioctl(pmu_fd[i], PERF_EVENT_IOC_SET_BPF,
61
-			     prog_fd[0]) == 0);
62
-		assert(ioctl(pmu_fd[i], PERF_EVENT_IOC_ENABLE, 0) == 0);
56
+		links[i] = bpf_program__attach_perf_event(prog, pmu_fd);
57
+		if (libbpf_get_error(links[i])) {
58
+			fprintf(stderr, "ERROR: Attach perf event\n");
59
+			links[i] = NULL;
60
+			close(pmu_fd);
61
+			return 1;
62
+		}
63
63
 	}
64
64
 
65
65
 	return 0;
66
66
 }
67
67
 
68
-static void sampling_end(int *pmu_fd)
68
+static void sampling_end(struct bpf_link *links[])
69
69
 {
70
70
 	int i;
71
71
 
72
72
 	for (i = 0; i < nr_cpus; i++)
73
-		close(pmu_fd[i]);
73
+		bpf_link__destroy(links[i]);
74
74
 }
75
75
 
76
76
 struct ipcount {
..
..
@@ -110,6 +110,11 @@
110
110
 	for (i = 0; i < max; i++) {
111
111
 		if (counts[i].ip > PAGE_OFFSET) {
112
112
 			sym = ksym_search(counts[i].ip);
113
+			if (!sym) {
114
+				printf("ksym not found. Is kallsyms loaded?\n");
115
+				continue;
116
+			}
117
+
113
118
 			printf("0x%-17llx %-32s %u\n", counts[i].ip, sym->name,
114
119
 			       counts[i].count);
115
120
 		} else {
..
..
@@ -127,14 +132,17 @@
127
132
 static void int_exit(int sig)
128
133
 {
129
134
 	printf("\n");
130
-	print_ip_map(map_fd[0]);
135
+	print_ip_map(map_fd);
131
136
 	exit(0);
132
137
 }
133
138
 
134
139
 int main(int argc, char **argv)
135
140
 {
141
+	int opt, freq = DEFAULT_FREQ, secs = DEFAULT_SECS, error = 1;
142
+	struct bpf_object *obj = NULL;
143
+	struct bpf_program *prog;
144
+	struct bpf_link **links;
136
145
 	char filename[256];
137
-	int *pmu_fd, opt, freq = DEFAULT_FREQ, secs = DEFAULT_SECS;
138
146
 
139
147
 	/* process arguments */
140
148
 	while ((opt = getopt(argc, argv, "F:h")) != -1) {
..
..
@@ -162,38 +170,58 @@
162
170
 	}
163
171
 
164
172
 	/* create perf FDs for each CPU */
165
-	nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
166
-	pmu_fd = malloc(nr_cpus * sizeof(int));
167
-	if (pmu_fd == NULL) {
168
-		fprintf(stderr, "ERROR: malloc of pmu_fd\n");
169
-		return 1;
173
+	nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
174
+	links = calloc(nr_cpus, sizeof(struct bpf_link *));
175
+	if (!links) {
176
+		fprintf(stderr, "ERROR: malloc of links\n");
177
+		goto cleanup;
178
+	}
179
+
180
+	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
181
+	obj = bpf_object__open_file(filename, NULL);
182
+	if (libbpf_get_error(obj)) {
183
+		fprintf(stderr, "ERROR: opening BPF object file failed\n");
184
+		obj = NULL;
185
+		goto cleanup;
186
+	}
187
+
188
+	prog = bpf_object__find_program_by_name(obj, "do_sample");
189
+	if (!prog) {
190
+		fprintf(stderr, "ERROR: finding a prog in obj file failed\n");
191
+		goto cleanup;
170
192
 	}
171
193
 
172
194
 	/* load BPF program */
173
-	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
174
-	if (load_bpf_file(filename)) {
175
-		fprintf(stderr, "ERROR: loading BPF program (errno %d):\n",
176
-			errno);
177
-		if (strcmp(bpf_log_buf, "") == 0)
178
-			fprintf(stderr, "Try: ulimit -l unlimited\n");
179
-		else
180
-			fprintf(stderr, "%s", bpf_log_buf);
181
-		return 1;
195
+	if (bpf_object__load(obj)) {
196
+		fprintf(stderr, "ERROR: loading BPF object file failed\n");
197
+		goto cleanup;
182
198
 	}
199
+
200
+	map_fd = bpf_object__find_map_fd_by_name(obj, "ip_map");
201
+	if (map_fd < 0) {
202
+		fprintf(stderr, "ERROR: finding a map in obj file failed\n");
203
+		goto cleanup;
204
+	}
205
+
183
206
 	signal(SIGINT, int_exit);
184
207
 	signal(SIGTERM, int_exit);
185
208
 
186
209
 	/* do sampling */
187
210
 	printf("Sampling at %d Hertz for %d seconds. Ctrl-C also ends.\n",
188
211
 	       freq, secs);
189
-	if (sampling_start(pmu_fd, freq) != 0)
190
-		return 1;
212
+	if (sampling_start(freq, prog, links) != 0)
213
+		goto cleanup;
214
+
191
215
 	sleep(secs);
192
-	sampling_end(pmu_fd);
193
-	free(pmu_fd);
216
+	error = 0;
194
217
 
218
+cleanup:
219
+	sampling_end(links);
195
220
 	/* output sample counts */
196
-	print_ip_map(map_fd[0]);
221
+	if (!error)
222
+		print_ip_map(map_fd);
197
223
 
198
-	return 0;
224
+	free(links);
225
+	bpf_object__close(obj);
226
+	return error;
199
227
 }