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) \ |
17 | do { \ |
18 | long long count; \ |
19 | wp_read(fd, &count, sizeof(long long)); \ |
20 | TEST_ASSERT_VAL(text, count == val); \ |
21 | } while (0) |
22 | |
23 | volatile u64 data1; |
24 | volatile u8 data2[3]; |
25 | |
26 | #ifndef __s390x__ |
27 | static 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 | |
38 | static 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 | |
54 | static 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: &attr, wp_type, wp_addr, wp_len); |
60 | fd = sys_perf_event_open(attr: &attr, pid: 0, cpu: -1, group_fd: -1, |
61 | flags: 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 | |
71 | static 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 | |
95 | static 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(wp_type: HW_BREAKPOINT_W, wp_addr: (void *)&data1, wp_len: 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 | |
119 | static 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(wp_type: HW_BREAKPOINT_R | HW_BREAKPOINT_W, wp_addr: (void *)&data1, |
129 | wp_len: 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 | |
144 | static 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(wp_type: HW_BREAKPOINT_W, wp_addr: (void *)&data1, wp_len: 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(attr: &new_attr, wp_type: HW_BREAKPOINT_W, wp_addr: (void *)&data2[0], |
162 | wp_len: 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 | |
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" ), |
203 | { .name = NULL, } |
204 | }; |
205 | |
206 | struct test_suite suite__wp = { |
207 | .desc = "Watchpoint" , |
208 | .test_cases = wp_tests, |
209 | }; |
210 | |