12e85d597SRavi Bangoria // SPDX-License-Identifier: GPL-2.0 22e85d597SRavi Bangoria #include <stdlib.h> 38520a98dSArnaldo Carvalho de Melo #include <string.h> 491854f9aSArnaldo Carvalho de Melo #include <unistd.h> 52e85d597SRavi Bangoria #include <sys/ioctl.h> 62e85d597SRavi Bangoria #include <linux/hw_breakpoint.h> 78520a98dSArnaldo Carvalho de Melo #include <linux/kernel.h> 82e85d597SRavi Bangoria #include "tests.h" 92e85d597SRavi Bangoria #include "debug.h" 108520a98dSArnaldo Carvalho de Melo #include "event.h" 112e85d597SRavi Bangoria #include "cloexec.h" 1291854f9aSArnaldo Carvalho de Melo #include "../perf-sys.h" 132e85d597SRavi Bangoria 142e85d597SRavi Bangoria #define WP_TEST_ASSERT_VAL(fd, text, val) \ 152e85d597SRavi Bangoria do { \ 162e85d597SRavi Bangoria long long count; \ 172e85d597SRavi Bangoria wp_read(fd, &count, sizeof(long long)); \ 182e85d597SRavi Bangoria TEST_ASSERT_VAL(text, count == val); \ 192e85d597SRavi Bangoria } while (0) 202e85d597SRavi Bangoria 212e85d597SRavi Bangoria volatile u64 data1; 222e85d597SRavi Bangoria volatile u8 data2[3]; 232e85d597SRavi Bangoria 242e85d597SRavi Bangoria static int wp_read(int fd, long long *count, int size) 252e85d597SRavi Bangoria { 262e85d597SRavi Bangoria int ret = read(fd, count, size); 272e85d597SRavi Bangoria 282e85d597SRavi Bangoria if (ret != size) { 292e85d597SRavi Bangoria pr_debug("failed to read: %d\n", ret); 302e85d597SRavi Bangoria return -1; 312e85d597SRavi Bangoria } 322e85d597SRavi Bangoria return 0; 332e85d597SRavi Bangoria } 342e85d597SRavi Bangoria 352e85d597SRavi Bangoria static void get__perf_event_attr(struct perf_event_attr *attr, int wp_type, 362e85d597SRavi Bangoria void *wp_addr, unsigned long wp_len) 372e85d597SRavi Bangoria { 382e85d597SRavi Bangoria memset(attr, 0, sizeof(struct perf_event_attr)); 392e85d597SRavi Bangoria attr->type = PERF_TYPE_BREAKPOINT; 402e85d597SRavi Bangoria attr->size = sizeof(struct perf_event_attr); 412e85d597SRavi Bangoria attr->config = 0; 422e85d597SRavi Bangoria attr->bp_type = wp_type; 432e85d597SRavi Bangoria attr->bp_addr = (unsigned long)wp_addr; 442e85d597SRavi Bangoria attr->bp_len = wp_len; 452e85d597SRavi Bangoria attr->sample_period = 1; 462e85d597SRavi Bangoria attr->sample_type = PERF_SAMPLE_IP; 472e85d597SRavi Bangoria attr->exclude_kernel = 1; 482e85d597SRavi Bangoria attr->exclude_hv = 1; 492e85d597SRavi Bangoria } 502e85d597SRavi Bangoria 512e85d597SRavi Bangoria static int __event(int wp_type, void *wp_addr, unsigned long wp_len) 522e85d597SRavi Bangoria { 532e85d597SRavi Bangoria int fd; 542e85d597SRavi Bangoria struct perf_event_attr attr; 552e85d597SRavi Bangoria 562e85d597SRavi Bangoria get__perf_event_attr(&attr, wp_type, wp_addr, wp_len); 572e85d597SRavi Bangoria fd = sys_perf_event_open(&attr, 0, -1, -1, 582e85d597SRavi Bangoria perf_event_open_cloexec_flag()); 592e85d597SRavi Bangoria if (fd < 0) 602e85d597SRavi Bangoria pr_debug("failed opening event %x\n", attr.bp_type); 612e85d597SRavi Bangoria 622e85d597SRavi Bangoria return fd; 632e85d597SRavi Bangoria } 642e85d597SRavi Bangoria 652e85d597SRavi Bangoria static int wp_ro_test(void) 662e85d597SRavi Bangoria { 672e85d597SRavi Bangoria int fd; 682e85d597SRavi Bangoria unsigned long tmp, tmp1 = rand(); 692e85d597SRavi Bangoria 702e85d597SRavi Bangoria fd = __event(HW_BREAKPOINT_R, (void *)&data1, sizeof(data1)); 712e85d597SRavi Bangoria if (fd < 0) 722e85d597SRavi Bangoria return -1; 732e85d597SRavi Bangoria 742e85d597SRavi Bangoria tmp = data1; 752e85d597SRavi Bangoria WP_TEST_ASSERT_VAL(fd, "RO watchpoint", 1); 762e85d597SRavi Bangoria 772e85d597SRavi Bangoria data1 = tmp1 + tmp; 782e85d597SRavi Bangoria WP_TEST_ASSERT_VAL(fd, "RO watchpoint", 1); 792e85d597SRavi Bangoria 802e85d597SRavi Bangoria close(fd); 812e85d597SRavi Bangoria return 0; 822e85d597SRavi Bangoria } 832e85d597SRavi Bangoria 842e85d597SRavi Bangoria static int wp_wo_test(void) 852e85d597SRavi Bangoria { 862e85d597SRavi Bangoria int fd; 872e85d597SRavi Bangoria unsigned long tmp, tmp1 = rand(); 882e85d597SRavi Bangoria 892e85d597SRavi Bangoria fd = __event(HW_BREAKPOINT_W, (void *)&data1, sizeof(data1)); 902e85d597SRavi Bangoria if (fd < 0) 912e85d597SRavi Bangoria return -1; 922e85d597SRavi Bangoria 932e85d597SRavi Bangoria tmp = data1; 942e85d597SRavi Bangoria WP_TEST_ASSERT_VAL(fd, "WO watchpoint", 0); 952e85d597SRavi Bangoria 962e85d597SRavi Bangoria data1 = tmp1 + tmp; 972e85d597SRavi Bangoria WP_TEST_ASSERT_VAL(fd, "WO watchpoint", 1); 982e85d597SRavi Bangoria 992e85d597SRavi Bangoria close(fd); 1002e85d597SRavi Bangoria return 0; 1012e85d597SRavi Bangoria } 1022e85d597SRavi Bangoria 1032e85d597SRavi Bangoria static int wp_rw_test(void) 1042e85d597SRavi Bangoria { 1052e85d597SRavi Bangoria int fd; 1062e85d597SRavi Bangoria unsigned long tmp, tmp1 = rand(); 1072e85d597SRavi Bangoria 1082e85d597SRavi Bangoria fd = __event(HW_BREAKPOINT_R | HW_BREAKPOINT_W, (void *)&data1, 1092e85d597SRavi Bangoria sizeof(data1)); 1102e85d597SRavi Bangoria if (fd < 0) 1112e85d597SRavi Bangoria return -1; 1122e85d597SRavi Bangoria 1132e85d597SRavi Bangoria tmp = data1; 1142e85d597SRavi Bangoria WP_TEST_ASSERT_VAL(fd, "RW watchpoint", 1); 1152e85d597SRavi Bangoria 1162e85d597SRavi Bangoria data1 = tmp1 + tmp; 1172e85d597SRavi Bangoria WP_TEST_ASSERT_VAL(fd, "RW watchpoint", 2); 1182e85d597SRavi Bangoria 1192e85d597SRavi Bangoria close(fd); 1202e85d597SRavi Bangoria return 0; 1212e85d597SRavi Bangoria } 1222e85d597SRavi Bangoria 1232e85d597SRavi Bangoria static int wp_modify_test(void) 1242e85d597SRavi Bangoria { 1252e85d597SRavi Bangoria int fd, ret; 1262e85d597SRavi Bangoria unsigned long tmp = rand(); 1272e85d597SRavi Bangoria struct perf_event_attr new_attr; 1282e85d597SRavi Bangoria 1292e85d597SRavi Bangoria fd = __event(HW_BREAKPOINT_W, (void *)&data1, sizeof(data1)); 1302e85d597SRavi Bangoria if (fd < 0) 1312e85d597SRavi Bangoria return -1; 1322e85d597SRavi Bangoria 1332e85d597SRavi Bangoria data1 = tmp; 1342e85d597SRavi Bangoria WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 1); 1352e85d597SRavi Bangoria 1362e85d597SRavi Bangoria /* Modify watchpoint with disabled = 1 */ 1372e85d597SRavi Bangoria get__perf_event_attr(&new_attr, HW_BREAKPOINT_W, (void *)&data2[0], 1382e85d597SRavi Bangoria sizeof(u8) * 2); 1392e85d597SRavi Bangoria new_attr.disabled = 1; 1402e85d597SRavi Bangoria ret = ioctl(fd, PERF_EVENT_IOC_MODIFY_ATTRIBUTES, &new_attr); 1412e85d597SRavi Bangoria if (ret < 0) { 1422e85d597SRavi Bangoria pr_debug("ioctl(PERF_EVENT_IOC_MODIFY_ATTRIBUTES) failed\n"); 1432e85d597SRavi Bangoria close(fd); 1442e85d597SRavi Bangoria return ret; 1452e85d597SRavi Bangoria } 1462e85d597SRavi Bangoria 1472e85d597SRavi Bangoria data2[1] = tmp; /* Not Counted */ 1482e85d597SRavi Bangoria WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 1); 1492e85d597SRavi Bangoria 1502e85d597SRavi Bangoria /* Enable the event */ 1512e85d597SRavi Bangoria ioctl(fd, PERF_EVENT_IOC_ENABLE, 0); 1522e85d597SRavi Bangoria if (ret < 0) { 1532e85d597SRavi Bangoria pr_debug("Failed to enable event\n"); 1542e85d597SRavi Bangoria close(fd); 1552e85d597SRavi Bangoria return ret; 1562e85d597SRavi Bangoria } 1572e85d597SRavi Bangoria 1582e85d597SRavi Bangoria data2[1] = tmp; /* Counted */ 1592e85d597SRavi Bangoria WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 2); 1602e85d597SRavi Bangoria 1612e85d597SRavi Bangoria data2[2] = tmp; /* Not Counted */ 1622e85d597SRavi Bangoria WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 2); 1632e85d597SRavi Bangoria 1642e85d597SRavi Bangoria close(fd); 1652e85d597SRavi Bangoria return 0; 1662e85d597SRavi Bangoria } 1672e85d597SRavi Bangoria 1682e85d597SRavi Bangoria static bool wp_ro_supported(void) 1692e85d597SRavi Bangoria { 1702e85d597SRavi Bangoria #if defined (__x86_64__) || defined (__i386__) 1712e85d597SRavi Bangoria return false; 1722e85d597SRavi Bangoria #else 1732e85d597SRavi Bangoria return true; 1742e85d597SRavi Bangoria #endif 1752e85d597SRavi Bangoria } 1762e85d597SRavi Bangoria 177cc3b964dSTommi Rantala static const char *wp_ro_skip_msg(void) 1782e85d597SRavi Bangoria { 1792e85d597SRavi Bangoria #if defined (__x86_64__) || defined (__i386__) 180cc3b964dSTommi Rantala return "missing hardware support"; 181cc3b964dSTommi Rantala #else 182cc3b964dSTommi Rantala return NULL; 1832e85d597SRavi Bangoria #endif 1842e85d597SRavi Bangoria } 1852e85d597SRavi Bangoria 1862e85d597SRavi Bangoria static struct { 1872e85d597SRavi Bangoria const char *desc; 1882e85d597SRavi Bangoria int (*target_func)(void); 1892e85d597SRavi Bangoria bool (*is_supported)(void); 190cc3b964dSTommi Rantala const char *(*skip_msg)(void); 1912e85d597SRavi Bangoria } wp_testcase_table[] = { 1922e85d597SRavi Bangoria { 1932e85d597SRavi Bangoria .desc = "Read Only Watchpoint", 1942e85d597SRavi Bangoria .target_func = &wp_ro_test, 1952e85d597SRavi Bangoria .is_supported = &wp_ro_supported, 1962e85d597SRavi Bangoria .skip_msg = &wp_ro_skip_msg, 1972e85d597SRavi Bangoria }, 1982e85d597SRavi Bangoria { 1992e85d597SRavi Bangoria .desc = "Write Only Watchpoint", 2002e85d597SRavi Bangoria .target_func = &wp_wo_test, 2012e85d597SRavi Bangoria }, 2022e85d597SRavi Bangoria { 2032e85d597SRavi Bangoria .desc = "Read / Write Watchpoint", 2042e85d597SRavi Bangoria .target_func = &wp_rw_test, 2052e85d597SRavi Bangoria }, 2062e85d597SRavi Bangoria { 2072e85d597SRavi Bangoria .desc = "Modify Watchpoint", 2082e85d597SRavi Bangoria .target_func = &wp_modify_test, 2092e85d597SRavi Bangoria }, 2102e85d597SRavi Bangoria }; 2112e85d597SRavi Bangoria 212d68f0365SIan Rogers static int test__wp_subtest_get_nr(void) 2132e85d597SRavi Bangoria { 2142e85d597SRavi Bangoria return (int)ARRAY_SIZE(wp_testcase_table); 2152e85d597SRavi Bangoria } 2162e85d597SRavi Bangoria 217d68f0365SIan Rogers static const char *test__wp_subtest_get_desc(int i) 2182e85d597SRavi Bangoria { 2192e85d597SRavi Bangoria if (i < 0 || i >= (int)ARRAY_SIZE(wp_testcase_table)) 2202e85d597SRavi Bangoria return NULL; 2212e85d597SRavi Bangoria return wp_testcase_table[i].desc; 2222e85d597SRavi Bangoria } 2232e85d597SRavi Bangoria 224d68f0365SIan Rogers static const char *test__wp_subtest_skip_reason(int i) 225cc3b964dSTommi Rantala { 226cc3b964dSTommi Rantala if (i < 0 || i >= (int)ARRAY_SIZE(wp_testcase_table)) 227cc3b964dSTommi Rantala return NULL; 228cc3b964dSTommi Rantala if (!wp_testcase_table[i].skip_msg) 229cc3b964dSTommi Rantala return NULL; 230cc3b964dSTommi Rantala return wp_testcase_table[i].skip_msg(); 231cc3b964dSTommi Rantala } 232cc3b964dSTommi Rantala 233*33f44bfdSIan Rogers static int test__wp(struct test_suite *test __maybe_unused, int i) 2342e85d597SRavi Bangoria { 2352e85d597SRavi Bangoria if (i < 0 || i >= (int)ARRAY_SIZE(wp_testcase_table)) 2362e85d597SRavi Bangoria return TEST_FAIL; 2372e85d597SRavi Bangoria 2382e85d597SRavi Bangoria if (wp_testcase_table[i].is_supported && 239cc3b964dSTommi Rantala !wp_testcase_table[i].is_supported()) 2402e85d597SRavi Bangoria return TEST_SKIP; 2412e85d597SRavi Bangoria 2422e85d597SRavi Bangoria return !wp_testcase_table[i].target_func() ? TEST_OK : TEST_FAIL; 2432e85d597SRavi Bangoria } 2440e24147dSThomas Richter 2450e24147dSThomas Richter /* The s390 so far does not have support for 2460e24147dSThomas Richter * instruction breakpoint using the perf_event_open() system call. 2470e24147dSThomas Richter */ 248d68f0365SIan Rogers static bool test__wp_is_supported(void) 2490e24147dSThomas Richter { 2500e24147dSThomas Richter #if defined(__s390x__) 2510e24147dSThomas Richter return false; 2520e24147dSThomas Richter #else 2530e24147dSThomas Richter return true; 2540e24147dSThomas Richter #endif 2550e24147dSThomas Richter } 256d68f0365SIan Rogers 257*33f44bfdSIan Rogers struct test_suite suite__wp = { 258d68f0365SIan Rogers .desc = "Watchpoint", 259d68f0365SIan Rogers .func = test__wp, 260d68f0365SIan Rogers .is_supported = test__wp_is_supported, 261d68f0365SIan Rogers .subtest = { 262d68f0365SIan Rogers .skip_if_fail = false, 263d68f0365SIan Rogers .get_nr = test__wp_subtest_get_nr, 264d68f0365SIan Rogers .get_desc = test__wp_subtest_get_desc, 265d68f0365SIan Rogers .skip_reason = test__wp_subtest_skip_reason, 266d68f0365SIan Rogers }, 267d68f0365SIan Rogers }; 268