Loading...
1// SPDX-License-Identifier: GPL-2.0
2#include <stdlib.h>
3#include <string.h>
4#include <unistd.h>
5#include <errno.h>
6#include <sys/ioctl.h>
7#include <linux/compiler.h>
8#include <linux/hw_breakpoint.h>
9#include <linux/kernel.h>
10#include "tests.h"
11#include "debug.h"
12#include "event.h"
13#include "cloexec.h"
14#include "../perf-sys.h"
15
16#define WP_TEST_ASSERT_VAL(fd, text, val) \
17do { \
18 long long count; \
19 wp_read(fd, &count, sizeof(long long)); \
20 TEST_ASSERT_VAL(text, count == val); \
21} while (0)
22
23volatile u64 data1;
24volatile u8 data2[3];
25
26#ifndef __s390x__
27static int wp_read(int fd, long long *count, int size)
28{
29 int ret = read(fd, count, size);
30
31 if (ret != size) {
32 pr_debug("failed to read: %d\n", ret);
33 return -1;
34 }
35 return 0;
36}
37
38static void get__perf_event_attr(struct perf_event_attr *attr, int wp_type,
39 void *wp_addr, unsigned long wp_len)
40{
41 memset(attr, 0, sizeof(struct perf_event_attr));
42 attr->type = PERF_TYPE_BREAKPOINT;
43 attr->size = sizeof(struct perf_event_attr);
44 attr->config = 0;
45 attr->bp_type = wp_type;
46 attr->bp_addr = (unsigned long)wp_addr;
47 attr->bp_len = wp_len;
48 attr->sample_period = 1;
49 attr->sample_type = PERF_SAMPLE_IP;
50 attr->exclude_kernel = 1;
51 attr->exclude_hv = 1;
52}
53
54static int __event(int wp_type, void *wp_addr, unsigned long wp_len)
55{
56 int fd;
57 struct perf_event_attr attr;
58
59 get__perf_event_attr(&attr, wp_type, wp_addr, wp_len);
60 fd = sys_perf_event_open(&attr, 0, -1, -1,
61 perf_event_open_cloexec_flag());
62 if (fd < 0) {
63 fd = -errno;
64 pr_debug("failed opening event %x\n", attr.bp_type);
65 }
66
67 return fd;
68}
69#endif
70
71static int test__wp_ro(struct test_suite *test __maybe_unused,
72 int subtest __maybe_unused)
73{
74#if defined(__s390x__) || defined(__x86_64__) || defined(__i386__)
75 return TEST_SKIP;
76#else
77 int fd;
78 unsigned long tmp, tmp1 = rand();
79
80 fd = __event(HW_BREAKPOINT_R, (void *)&data1, sizeof(data1));
81 if (fd < 0)
82 return fd == -ENODEV ? TEST_SKIP : -1;
83
84 tmp = data1;
85 WP_TEST_ASSERT_VAL(fd, "RO watchpoint", 1);
86
87 data1 = tmp1 + tmp;
88 WP_TEST_ASSERT_VAL(fd, "RO watchpoint", 1);
89
90 close(fd);
91 return 0;
92#endif
93}
94
95static int test__wp_wo(struct test_suite *test __maybe_unused,
96 int subtest __maybe_unused)
97{
98#if defined(__s390x__)
99 return TEST_SKIP;
100#else
101 int fd;
102 unsigned long tmp, tmp1 = rand();
103
104 fd = __event(HW_BREAKPOINT_W, (void *)&data1, sizeof(data1));
105 if (fd < 0)
106 return fd == -ENODEV ? TEST_SKIP : -1;
107
108 tmp = data1;
109 WP_TEST_ASSERT_VAL(fd, "WO watchpoint", 0);
110
111 data1 = tmp1 + tmp;
112 WP_TEST_ASSERT_VAL(fd, "WO watchpoint", 1);
113
114 close(fd);
115 return 0;
116#endif
117}
118
119static int test__wp_rw(struct test_suite *test __maybe_unused,
120 int subtest __maybe_unused)
121{
122#if defined(__s390x__)
123 return TEST_SKIP;
124#else
125 int fd;
126 unsigned long tmp, tmp1 = rand();
127
128 fd = __event(HW_BREAKPOINT_R | HW_BREAKPOINT_W, (void *)&data1,
129 sizeof(data1));
130 if (fd < 0)
131 return fd == -ENODEV ? TEST_SKIP : -1;
132
133 tmp = data1;
134 WP_TEST_ASSERT_VAL(fd, "RW watchpoint", 1);
135
136 data1 = tmp1 + tmp;
137 WP_TEST_ASSERT_VAL(fd, "RW watchpoint", 2);
138
139 close(fd);
140 return 0;
141#endif
142}
143
144static int test__wp_modify(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
145{
146#if defined(__s390x__)
147 return TEST_SKIP;
148#else
149 int fd, ret;
150 unsigned long tmp = rand();
151 struct perf_event_attr new_attr;
152
153 fd = __event(HW_BREAKPOINT_W, (void *)&data1, sizeof(data1));
154 if (fd < 0)
155 return fd == -ENODEV ? TEST_SKIP : -1;
156
157 data1 = tmp;
158 WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 1);
159
160 /* Modify watchpoint with disabled = 1 */
161 get__perf_event_attr(&new_attr, HW_BREAKPOINT_W, (void *)&data2[0],
162 sizeof(u8) * 2);
163 new_attr.disabled = 1;
164 ret = ioctl(fd, PERF_EVENT_IOC_MODIFY_ATTRIBUTES, &new_attr);
165 if (ret < 0) {
166 if (errno == ENOTTY) {
167 test->test_cases[subtest].skip_reason = "missing kernel support";
168 ret = TEST_SKIP;
169 }
170
171 pr_debug("ioctl(PERF_EVENT_IOC_MODIFY_ATTRIBUTES) failed\n");
172 close(fd);
173 return ret;
174 }
175
176 data2[1] = tmp; /* Not Counted */
177 WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 1);
178
179 /* Enable the event */
180 ioctl(fd, PERF_EVENT_IOC_ENABLE, 0);
181 if (ret < 0) {
182 pr_debug("Failed to enable event\n");
183 close(fd);
184 return ret;
185 }
186
187 data2[1] = tmp; /* Counted */
188 WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 2);
189
190 data2[2] = tmp; /* Not Counted */
191 WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 2);
192
193 close(fd);
194 return 0;
195#endif
196}
197
198static struct test_case wp_tests[] = {
199 TEST_CASE_REASON("Read Only Watchpoint", wp_ro, "missing hardware support"),
200 TEST_CASE_REASON("Write Only Watchpoint", wp_wo, "missing hardware support"),
201 TEST_CASE_REASON("Read / Write Watchpoint", wp_rw, "missing hardware support"),
202 TEST_CASE_REASON("Modify Watchpoint", wp_modify, "missing hardware support"),
203 { .name = NULL, }
204};
205
206struct test_suite suite__wp = {
207 .desc = "Watchpoint",
208 .test_cases = wp_tests,
209};
1// SPDX-License-Identifier: GPL-2.0
2#include <stdlib.h>
3#include <string.h>
4#include <unistd.h>
5#include <sys/ioctl.h>
6#include <linux/hw_breakpoint.h>
7#include <linux/kernel.h>
8#include "tests.h"
9#include "debug.h"
10#include "event.h"
11#include "cloexec.h"
12#include "../perf-sys.h"
13
14#define WP_TEST_ASSERT_VAL(fd, text, val) \
15do { \
16 long long count; \
17 wp_read(fd, &count, sizeof(long long)); \
18 TEST_ASSERT_VAL(text, count == val); \
19} while (0)
20
21volatile u64 data1;
22volatile u8 data2[3];
23
24static int wp_read(int fd, long long *count, int size)
25{
26 int ret = read(fd, count, size);
27
28 if (ret != size) {
29 pr_debug("failed to read: %d\n", ret);
30 return -1;
31 }
32 return 0;
33}
34
35static void get__perf_event_attr(struct perf_event_attr *attr, int wp_type,
36 void *wp_addr, unsigned long wp_len)
37{
38 memset(attr, 0, sizeof(struct perf_event_attr));
39 attr->type = PERF_TYPE_BREAKPOINT;
40 attr->size = sizeof(struct perf_event_attr);
41 attr->config = 0;
42 attr->bp_type = wp_type;
43 attr->bp_addr = (unsigned long)wp_addr;
44 attr->bp_len = wp_len;
45 attr->sample_period = 1;
46 attr->sample_type = PERF_SAMPLE_IP;
47 attr->exclude_kernel = 1;
48 attr->exclude_hv = 1;
49}
50
51static int __event(int wp_type, void *wp_addr, unsigned long wp_len)
52{
53 int fd;
54 struct perf_event_attr attr;
55
56 get__perf_event_attr(&attr, wp_type, wp_addr, wp_len);
57 fd = sys_perf_event_open(&attr, 0, -1, -1,
58 perf_event_open_cloexec_flag());
59 if (fd < 0)
60 pr_debug("failed opening event %x\n", attr.bp_type);
61
62 return fd;
63}
64
65static int wp_ro_test(void)
66{
67 int fd;
68 unsigned long tmp, tmp1 = rand();
69
70 fd = __event(HW_BREAKPOINT_R, (void *)&data1, sizeof(data1));
71 if (fd < 0)
72 return -1;
73
74 tmp = data1;
75 WP_TEST_ASSERT_VAL(fd, "RO watchpoint", 1);
76
77 data1 = tmp1 + tmp;
78 WP_TEST_ASSERT_VAL(fd, "RO watchpoint", 1);
79
80 close(fd);
81 return 0;
82}
83
84static int wp_wo_test(void)
85{
86 int fd;
87 unsigned long tmp, tmp1 = rand();
88
89 fd = __event(HW_BREAKPOINT_W, (void *)&data1, sizeof(data1));
90 if (fd < 0)
91 return -1;
92
93 tmp = data1;
94 WP_TEST_ASSERT_VAL(fd, "WO watchpoint", 0);
95
96 data1 = tmp1 + tmp;
97 WP_TEST_ASSERT_VAL(fd, "WO watchpoint", 1);
98
99 close(fd);
100 return 0;
101}
102
103static int wp_rw_test(void)
104{
105 int fd;
106 unsigned long tmp, tmp1 = rand();
107
108 fd = __event(HW_BREAKPOINT_R | HW_BREAKPOINT_W, (void *)&data1,
109 sizeof(data1));
110 if (fd < 0)
111 return -1;
112
113 tmp = data1;
114 WP_TEST_ASSERT_VAL(fd, "RW watchpoint", 1);
115
116 data1 = tmp1 + tmp;
117 WP_TEST_ASSERT_VAL(fd, "RW watchpoint", 2);
118
119 close(fd);
120 return 0;
121}
122
123static int wp_modify_test(void)
124{
125 int fd, ret;
126 unsigned long tmp = rand();
127 struct perf_event_attr new_attr;
128
129 fd = __event(HW_BREAKPOINT_W, (void *)&data1, sizeof(data1));
130 if (fd < 0)
131 return -1;
132
133 data1 = tmp;
134 WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 1);
135
136 /* Modify watchpoint with disabled = 1 */
137 get__perf_event_attr(&new_attr, HW_BREAKPOINT_W, (void *)&data2[0],
138 sizeof(u8) * 2);
139 new_attr.disabled = 1;
140 ret = ioctl(fd, PERF_EVENT_IOC_MODIFY_ATTRIBUTES, &new_attr);
141 if (ret < 0) {
142 pr_debug("ioctl(PERF_EVENT_IOC_MODIFY_ATTRIBUTES) failed\n");
143 close(fd);
144 return ret;
145 }
146
147 data2[1] = tmp; /* Not Counted */
148 WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 1);
149
150 /* Enable the event */
151 ioctl(fd, PERF_EVENT_IOC_ENABLE, 0);
152 if (ret < 0) {
153 pr_debug("Failed to enable event\n");
154 close(fd);
155 return ret;
156 }
157
158 data2[1] = tmp; /* Counted */
159 WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 2);
160
161 data2[2] = tmp; /* Not Counted */
162 WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 2);
163
164 close(fd);
165 return 0;
166}
167
168static bool wp_ro_supported(void)
169{
170#if defined (__x86_64__) || defined (__i386__)
171 return false;
172#else
173 return true;
174#endif
175}
176
177static const char *wp_ro_skip_msg(void)
178{
179#if defined (__x86_64__) || defined (__i386__)
180 return "missing hardware support";
181#else
182 return NULL;
183#endif
184}
185
186static struct {
187 const char *desc;
188 int (*target_func)(void);
189 bool (*is_supported)(void);
190 const char *(*skip_msg)(void);
191} wp_testcase_table[] = {
192 {
193 .desc = "Read Only Watchpoint",
194 .target_func = &wp_ro_test,
195 .is_supported = &wp_ro_supported,
196 .skip_msg = &wp_ro_skip_msg,
197 },
198 {
199 .desc = "Write Only Watchpoint",
200 .target_func = &wp_wo_test,
201 },
202 {
203 .desc = "Read / Write Watchpoint",
204 .target_func = &wp_rw_test,
205 },
206 {
207 .desc = "Modify Watchpoint",
208 .target_func = &wp_modify_test,
209 },
210};
211
212int test__wp_subtest_get_nr(void)
213{
214 return (int)ARRAY_SIZE(wp_testcase_table);
215}
216
217const char *test__wp_subtest_get_desc(int i)
218{
219 if (i < 0 || i >= (int)ARRAY_SIZE(wp_testcase_table))
220 return NULL;
221 return wp_testcase_table[i].desc;
222}
223
224const char *test__wp_subtest_skip_reason(int i)
225{
226 if (i < 0 || i >= (int)ARRAY_SIZE(wp_testcase_table))
227 return NULL;
228 if (!wp_testcase_table[i].skip_msg)
229 return NULL;
230 return wp_testcase_table[i].skip_msg();
231}
232
233int test__wp(struct test *test __maybe_unused, int i)
234{
235 if (i < 0 || i >= (int)ARRAY_SIZE(wp_testcase_table))
236 return TEST_FAIL;
237
238 if (wp_testcase_table[i].is_supported &&
239 !wp_testcase_table[i].is_supported())
240 return TEST_SKIP;
241
242 return !wp_testcase_table[i].target_func() ? TEST_OK : TEST_FAIL;
243}
244
245/* The s390 so far does not have support for
246 * instruction breakpoint using the perf_event_open() system call.
247 */
248bool test__wp_is_supported(void)
249{
250#if defined(__s390x__)
251 return false;
252#else
253 return true;
254#endif
255}