1 // SPDX-License-Identifier: GPL-2.0
7 #include <linux/compiler.h>
8 #include <linux/hw_breakpoint.h>
9 #include <linux/kernel.h>
14 #include "../perf-sys.h"
16 #define WP_TEST_ASSERT_VAL(fd, text, val) \
19 wp_read(fd, &count, sizeof(long long)); \
20 TEST_ASSERT_VAL(text, count == val); \
27 static int wp_read(int fd, long long *count, int size)
29 int ret = read(fd, count, size);
32 pr_debug("failed to read: %d\n", ret);
38 static void get__perf_event_attr(struct perf_event_attr *attr, int wp_type,
39 void *wp_addr, unsigned long wp_len)
41 memset(attr, 0, sizeof(struct perf_event_attr));
42 attr->type = PERF_TYPE_BREAKPOINT;
43 attr->size = sizeof(struct perf_event_attr);
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;
54 static int __event(int wp_type, void *wp_addr, unsigned long wp_len)
57 struct perf_event_attr attr;
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());
64 pr_debug("failed opening event %x\n", attr.bp_type);
71 static int test__wp_ro(struct test_suite *test __maybe_unused,
72 int subtest __maybe_unused)
74 #if defined(__s390x__) || defined(__x86_64__) || defined(__i386__)
78 unsigned long tmp, tmp1 = rand();
80 fd = __event(HW_BREAKPOINT_R, (void *)&data1, sizeof(data1));
82 return fd == -ENODEV ? TEST_SKIP : -1;
85 WP_TEST_ASSERT_VAL(fd, "RO watchpoint", 1);
88 WP_TEST_ASSERT_VAL(fd, "RO watchpoint", 1);
95 static int test__wp_wo(struct test_suite *test __maybe_unused,
96 int subtest __maybe_unused)
98 #if defined(__s390x__)
102 unsigned long tmp, tmp1 = rand();
104 fd = __event(HW_BREAKPOINT_W, (void *)&data1, sizeof(data1));
106 return fd == -ENODEV ? TEST_SKIP : -1;
109 WP_TEST_ASSERT_VAL(fd, "WO watchpoint", 0);
112 WP_TEST_ASSERT_VAL(fd, "WO watchpoint", 1);
119 static int test__wp_rw(struct test_suite *test __maybe_unused,
120 int subtest __maybe_unused)
122 #if defined(__s390x__)
126 unsigned long tmp, tmp1 = rand();
128 fd = __event(HW_BREAKPOINT_R | HW_BREAKPOINT_W, (void *)&data1,
131 return fd == -ENODEV ? TEST_SKIP : -1;
134 WP_TEST_ASSERT_VAL(fd, "RW watchpoint", 1);
137 WP_TEST_ASSERT_VAL(fd, "RW watchpoint", 2);
144 static int test__wp_modify(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
146 #if defined(__s390x__)
150 unsigned long tmp = rand();
151 struct perf_event_attr new_attr;
153 fd = __event(HW_BREAKPOINT_W, (void *)&data1, sizeof(data1));
155 return fd == -ENODEV ? TEST_SKIP : -1;
158 WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 1);
160 /* Modify watchpoint with disabled = 1 */
161 get__perf_event_attr(&new_attr, HW_BREAKPOINT_W, (void *)&data2[0],
163 new_attr.disabled = 1;
164 ret = ioctl(fd, PERF_EVENT_IOC_MODIFY_ATTRIBUTES, &new_attr);
166 if (errno == ENOTTY) {
167 test->test_cases[subtest].skip_reason = "missing kernel support";
171 pr_debug("ioctl(PERF_EVENT_IOC_MODIFY_ATTRIBUTES) failed\n");
176 data2[1] = tmp; /* Not Counted */
177 WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 1);
179 /* Enable the event */
180 ioctl(fd, PERF_EVENT_IOC_ENABLE, 0);
182 pr_debug("Failed to enable event\n");
187 data2[1] = tmp; /* Counted */
188 WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 2);
190 data2[2] = tmp; /* Not Counted */
191 WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 2);
198 static 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"),
206 struct test_suite suite__wp = {
207 .desc = "Watchpoint",
208 .test_cases = wp_tests,