1 // SPDX-License-Identifier: GPL-2.0
6 #include <linux/hw_breakpoint.h>
7 #include <linux/kernel.h>
12 #include "../perf-sys.h"
14 #define WP_TEST_ASSERT_VAL(fd, text, val) \
17 wp_read(fd, &count, sizeof(long long)); \
18 TEST_ASSERT_VAL(text, count == val); \
24 static int wp_read(int fd, long long *count, int size)
26 int ret = read(fd, count, size);
29 pr_debug("failed to read: %d\n", ret);
35 static void get__perf_event_attr(struct perf_event_attr *attr, int wp_type,
36 void *wp_addr, unsigned long wp_len)
38 memset(attr, 0, sizeof(struct perf_event_attr));
39 attr->type = PERF_TYPE_BREAKPOINT;
40 attr->size = sizeof(struct perf_event_attr);
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;
51 static int __event(int wp_type, void *wp_addr, unsigned long wp_len)
54 struct perf_event_attr attr;
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());
60 pr_debug("failed opening event %x\n", attr.bp_type);
65 static int wp_ro_test(void)
68 unsigned long tmp, tmp1 = rand();
70 fd = __event(HW_BREAKPOINT_R, (void *)&data1, sizeof(data1));
75 WP_TEST_ASSERT_VAL(fd, "RO watchpoint", 1);
78 WP_TEST_ASSERT_VAL(fd, "RO watchpoint", 1);
84 static int wp_wo_test(void)
87 unsigned long tmp, tmp1 = rand();
89 fd = __event(HW_BREAKPOINT_W, (void *)&data1, sizeof(data1));
94 WP_TEST_ASSERT_VAL(fd, "WO watchpoint", 0);
97 WP_TEST_ASSERT_VAL(fd, "WO watchpoint", 1);
103 static int wp_rw_test(void)
106 unsigned long tmp, tmp1 = rand();
108 fd = __event(HW_BREAKPOINT_R | HW_BREAKPOINT_W, (void *)&data1,
114 WP_TEST_ASSERT_VAL(fd, "RW watchpoint", 1);
117 WP_TEST_ASSERT_VAL(fd, "RW watchpoint", 2);
123 static int wp_modify_test(void)
126 unsigned long tmp = rand();
127 struct perf_event_attr new_attr;
129 fd = __event(HW_BREAKPOINT_W, (void *)&data1, sizeof(data1));
134 WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 1);
136 /* Modify watchpoint with disabled = 1 */
137 get__perf_event_attr(&new_attr, HW_BREAKPOINT_W, (void *)&data2[0],
139 new_attr.disabled = 1;
140 ret = ioctl(fd, PERF_EVENT_IOC_MODIFY_ATTRIBUTES, &new_attr);
142 pr_debug("ioctl(PERF_EVENT_IOC_MODIFY_ATTRIBUTES) failed\n");
147 data2[1] = tmp; /* Not Counted */
148 WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 1);
150 /* Enable the event */
151 ioctl(fd, PERF_EVENT_IOC_ENABLE, 0);
153 pr_debug("Failed to enable event\n");
158 data2[1] = tmp; /* Counted */
159 WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 2);
161 data2[2] = tmp; /* Not Counted */
162 WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 2);
168 static bool wp_ro_supported(void)
170 #if defined (__x86_64__) || defined (__i386__)
177 static void wp_ro_skip_msg(void)
179 #if defined (__x86_64__) || defined (__i386__)
180 pr_debug("Hardware does not support read only watchpoints.\n");
186 int (*target_func)(void);
187 bool (*is_supported)(void);
188 void (*skip_msg)(void);
189 } wp_testcase_table[] = {
191 .desc = "Read Only Watchpoint",
192 .target_func = &wp_ro_test,
193 .is_supported = &wp_ro_supported,
194 .skip_msg = &wp_ro_skip_msg,
197 .desc = "Write Only Watchpoint",
198 .target_func = &wp_wo_test,
201 .desc = "Read / Write Watchpoint",
202 .target_func = &wp_rw_test,
205 .desc = "Modify Watchpoint",
206 .target_func = &wp_modify_test,
210 int test__wp_subtest_get_nr(void)
212 return (int)ARRAY_SIZE(wp_testcase_table);
215 const char *test__wp_subtest_get_desc(int i)
217 if (i < 0 || i >= (int)ARRAY_SIZE(wp_testcase_table))
219 return wp_testcase_table[i].desc;
222 int test__wp(struct test *test __maybe_unused, int i)
224 if (i < 0 || i >= (int)ARRAY_SIZE(wp_testcase_table))
227 if (wp_testcase_table[i].is_supported &&
228 !wp_testcase_table[i].is_supported()) {
229 wp_testcase_table[i].skip_msg();
233 return !wp_testcase_table[i].target_func() ? TEST_OK : TEST_FAIL;
236 /* The s390 so far does not have support for
237 * instruction breakpoint using the perf_event_open() system call.
239 bool test__wp_is_supported(void)
241 #if defined(__s390x__)