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5875cf4c | 1 | // SPDX-License-Identifier: GPL-2.0 |
032db28e JO |
2 | /* |
3 | * Powerpc needs __SANE_USERSPACE_TYPES__ before <linux/types.h> to select | |
4 | * 'int-ll64.h' and avoid compile warnings when printing __u64 with %llu. | |
5 | */ | |
6 | #define __SANE_USERSPACE_TYPES__ | |
7 | ||
8 | #include <stdlib.h> | |
9 | #include <stdio.h> | |
10 | #include <unistd.h> | |
11 | #include <string.h> | |
12 | #include <sys/ioctl.h> | |
032db28e | 13 | #include <fcntl.h> |
032db28e | 14 | #include <linux/hw_breakpoint.h> |
032db28e JO |
15 | |
16 | #include "tests.h" | |
17 | #include "debug.h" | |
8520a98d | 18 | #include "event.h" |
91854f9a | 19 | #include "../perf-sys.h" |
032db28e JO |
20 | #include "cloexec.h" |
21 | ||
cff20b31 | 22 | static volatile long the_var; |
032db28e JO |
23 | |
24 | static noinline int test_function(void) | |
25 | { | |
26 | return 0; | |
27 | } | |
28 | ||
29 | static int __event(bool is_x, void *addr, struct perf_event_attr *attr) | |
30 | { | |
31 | int fd; | |
32 | ||
33 | memset(attr, 0, sizeof(struct perf_event_attr)); | |
34 | attr->type = PERF_TYPE_BREAKPOINT; | |
35 | attr->size = sizeof(struct perf_event_attr); | |
36 | ||
37 | attr->config = 0; | |
38 | attr->bp_type = is_x ? HW_BREAKPOINT_X : HW_BREAKPOINT_W; | |
39 | attr->bp_addr = (unsigned long) addr; | |
40 | attr->bp_len = sizeof(long); | |
41 | ||
42 | attr->sample_period = 1; | |
43 | attr->sample_type = PERF_SAMPLE_IP; | |
44 | ||
45 | attr->exclude_kernel = 1; | |
46 | attr->exclude_hv = 1; | |
47 | ||
48 | fd = sys_perf_event_open(attr, -1, 0, -1, | |
49 | perf_event_open_cloexec_flag()); | |
50 | if (fd < 0) { | |
51 | pr_debug("failed opening event %llx\n", attr->config); | |
52 | return TEST_FAIL; | |
53 | } | |
54 | ||
55 | return fd; | |
56 | } | |
57 | ||
58 | static int wp_event(void *addr, struct perf_event_attr *attr) | |
59 | { | |
60 | return __event(false, addr, attr); | |
61 | } | |
62 | ||
63 | static int bp_event(void *addr, struct perf_event_attr *attr) | |
64 | { | |
65 | return __event(true, addr, attr); | |
66 | } | |
67 | ||
68 | static int bp_accounting(int wp_cnt, int share) | |
69 | { | |
70 | struct perf_event_attr attr, attr_mod, attr_new; | |
71 | int i, fd[wp_cnt], fd_wp, ret; | |
72 | ||
73 | for (i = 0; i < wp_cnt; i++) { | |
74 | fd[i] = wp_event((void *)&the_var, &attr); | |
75 | TEST_ASSERT_VAL("failed to create wp\n", fd[i] != -1); | |
76 | pr_debug("wp %d created\n", i); | |
77 | } | |
78 | ||
79 | attr_mod = attr; | |
80 | attr_mod.bp_type = HW_BREAKPOINT_X; | |
81 | attr_mod.bp_addr = (unsigned long) test_function; | |
82 | ||
83 | ret = ioctl(fd[0], PERF_EVENT_IOC_MODIFY_ATTRIBUTES, &attr_mod); | |
84 | TEST_ASSERT_VAL("failed to modify wp\n", ret == 0); | |
85 | ||
86 | pr_debug("wp 0 modified to bp\n"); | |
87 | ||
88 | if (!share) { | |
89 | fd_wp = wp_event((void *)&the_var, &attr_new); | |
90 | TEST_ASSERT_VAL("failed to create max wp\n", fd_wp != -1); | |
91 | pr_debug("wp max created\n"); | |
92 | } | |
93 | ||
94 | for (i = 0; i < wp_cnt; i++) | |
95 | close(fd[i]); | |
96 | ||
97 | return 0; | |
98 | } | |
99 | ||
100 | static int detect_cnt(bool is_x) | |
101 | { | |
102 | struct perf_event_attr attr; | |
1cd61883 | 103 | void *addr = is_x ? (void *)test_function : (void *)&the_var; |
032db28e JO |
104 | int fd[100], cnt = 0, i; |
105 | ||
106 | while (1) { | |
032db28e JO |
107 | if (cnt == 100) { |
108 | pr_debug("way too many debug registers, fix the test\n"); | |
109 | return 0; | |
110 | } | |
66790bc8 | 111 | fd[cnt] = __event(is_x, addr, &attr); |
032db28e | 112 | |
66790bc8 CIK |
113 | if (fd[cnt] < 0) |
114 | break; | |
032db28e JO |
115 | cnt++; |
116 | } | |
117 | ||
118 | for (i = 0; i < cnt; i++) | |
119 | close(fd[i]); | |
120 | ||
121 | return cnt; | |
122 | } | |
123 | ||
124 | static int detect_ioctl(void) | |
125 | { | |
126 | struct perf_event_attr attr; | |
127 | int fd, ret = 1; | |
128 | ||
129 | fd = wp_event((void *) &the_var, &attr); | |
130 | if (fd > 0) { | |
131 | ret = ioctl(fd, PERF_EVENT_IOC_MODIFY_ATTRIBUTES, &attr); | |
132 | close(fd); | |
133 | } | |
134 | ||
135 | return ret ? 0 : 1; | |
136 | } | |
137 | ||
138 | static int detect_share(int wp_cnt, int bp_cnt) | |
139 | { | |
140 | struct perf_event_attr attr; | |
141 | int i, fd[wp_cnt + bp_cnt], ret; | |
142 | ||
143 | for (i = 0; i < wp_cnt; i++) { | |
144 | fd[i] = wp_event((void *)&the_var, &attr); | |
145 | TEST_ASSERT_VAL("failed to create wp\n", fd[i] != -1); | |
146 | } | |
147 | ||
148 | for (; i < (bp_cnt + wp_cnt); i++) { | |
149 | fd[i] = bp_event((void *)test_function, &attr); | |
150 | if (fd[i] == -1) | |
151 | break; | |
152 | } | |
153 | ||
154 | ret = i != (bp_cnt + wp_cnt); | |
155 | ||
156 | while (i--) | |
157 | close(fd[i]); | |
158 | ||
159 | return ret; | |
160 | } | |
161 | ||
162 | /* | |
163 | * This test does following: | |
164 | * - detects the number of watch/break-points, | |
165 | * skip test if any is missing | |
166 | * - detects PERF_EVENT_IOC_MODIFY_ATTRIBUTES ioctl, | |
167 | * skip test if it's missing | |
168 | * - detects if watchpoints and breakpoints share | |
169 | * same slots | |
170 | * - create all possible watchpoints on cpu 0 | |
171 | * - change one of it to breakpoint | |
172 | * - in case wp and bp do not share slots, | |
173 | * we create another watchpoint to ensure | |
174 | * the slot accounting is correct | |
175 | */ | |
176 | int test__bp_accounting(struct test *test __maybe_unused, int subtest __maybe_unused) | |
177 | { | |
178 | int has_ioctl = detect_ioctl(); | |
179 | int wp_cnt = detect_cnt(false); | |
180 | int bp_cnt = detect_cnt(true); | |
181 | int share = detect_share(wp_cnt, bp_cnt); | |
182 | ||
183 | pr_debug("watchpoints count %d, breakpoints count %d, has_ioctl %d, share %d\n", | |
184 | wp_cnt, bp_cnt, has_ioctl, share); | |
185 | ||
186 | if (!wp_cnt || !bp_cnt || !has_ioctl) | |
187 | return TEST_SKIP; | |
188 | ||
189 | return bp_accounting(wp_cnt, share); | |
190 | } | |
e533eadf LY |
191 | |
192 | bool test__bp_account_is_supported(void) | |
193 | { | |
194 | /* | |
195 | * PowerPC and S390 do not support creation of instruction | |
196 | * breakpoints using the perf_event interface. | |
197 | * | |
198 | * Just disable the test for these architectures until these | |
199 | * issues are resolved. | |
200 | */ | |
201 | #if defined(__powerpc__) || defined(__s390x__) | |
202 | return false; | |
203 | #else | |
204 | return true; | |
205 | #endif | |
206 | } |