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, 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 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(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 } 118 119 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(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 } 143 144 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(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 } 197 198 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