// SPDX-License-Identifier: GPL-2.0 #include #include #include #include #include #include #include "tests.h" #include "debug.h" #include "event.h" #include "cloexec.h" #include "../perf-sys.h" #define WP_TEST_ASSERT_VAL(fd, text, val) \ do { \ long long count; \ wp_read(fd, &count, sizeof(long long)); \ TEST_ASSERT_VAL(text, count == val); \ } while (0) volatile u64 data1; volatile u8 data2[3]; static int wp_read(int fd, long long *count, int size) { int ret = read(fd, count, size); if (ret != size) { pr_debug("failed to read: %d\n", ret); return -1; } return 0; } static void get__perf_event_attr(struct perf_event_attr *attr, int wp_type, void *wp_addr, unsigned long wp_len) { memset(attr, 0, sizeof(struct perf_event_attr)); attr->type = PERF_TYPE_BREAKPOINT; attr->size = sizeof(struct perf_event_attr); attr->config = 0; attr->bp_type = wp_type; attr->bp_addr = (unsigned long)wp_addr; attr->bp_len = wp_len; attr->sample_period = 1; attr->sample_type = PERF_SAMPLE_IP; attr->exclude_kernel = 1; attr->exclude_hv = 1; } static int __event(int wp_type, void *wp_addr, unsigned long wp_len) { int fd; struct perf_event_attr attr; get__perf_event_attr(&attr, wp_type, wp_addr, wp_len); fd = sys_perf_event_open(&attr, 0, -1, -1, perf_event_open_cloexec_flag()); if (fd < 0) pr_debug("failed opening event %x\n", attr.bp_type); return fd; } static int wp_ro_test(void) { int fd; unsigned long tmp, tmp1 = rand(); fd = __event(HW_BREAKPOINT_R, (void *)&data1, sizeof(data1)); if (fd < 0) return -1; tmp = data1; WP_TEST_ASSERT_VAL(fd, "RO watchpoint", 1); data1 = tmp1 + tmp; WP_TEST_ASSERT_VAL(fd, "RO watchpoint", 1); close(fd); return 0; } static int wp_wo_test(void) { int fd; unsigned long tmp, tmp1 = rand(); fd = __event(HW_BREAKPOINT_W, (void *)&data1, sizeof(data1)); if (fd < 0) return -1; tmp = data1; WP_TEST_ASSERT_VAL(fd, "WO watchpoint", 0); data1 = tmp1 + tmp; WP_TEST_ASSERT_VAL(fd, "WO watchpoint", 1); close(fd); return 0; } static int wp_rw_test(void) { int fd; unsigned long tmp, tmp1 = rand(); fd = __event(HW_BREAKPOINT_R | HW_BREAKPOINT_W, (void *)&data1, sizeof(data1)); if (fd < 0) return -1; tmp = data1; WP_TEST_ASSERT_VAL(fd, "RW watchpoint", 1); data1 = tmp1 + tmp; WP_TEST_ASSERT_VAL(fd, "RW watchpoint", 2); close(fd); return 0; } static int wp_modify_test(void) { int fd, ret; unsigned long tmp = rand(); struct perf_event_attr new_attr; fd = __event(HW_BREAKPOINT_W, (void *)&data1, sizeof(data1)); if (fd < 0) return -1; data1 = tmp; WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 1); /* Modify watchpoint with disabled = 1 */ get__perf_event_attr(&new_attr, HW_BREAKPOINT_W, (void *)&data2[0], sizeof(u8) * 2); new_attr.disabled = 1; ret = ioctl(fd, PERF_EVENT_IOC_MODIFY_ATTRIBUTES, &new_attr); if (ret < 0) { pr_debug("ioctl(PERF_EVENT_IOC_MODIFY_ATTRIBUTES) failed\n"); close(fd); return ret; } data2[1] = tmp; /* Not Counted */ WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 1); /* Enable the event */ ioctl(fd, PERF_EVENT_IOC_ENABLE, 0); if (ret < 0) { pr_debug("Failed to enable event\n"); close(fd); return ret; } data2[1] = tmp; /* Counted */ WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 2); data2[2] = tmp; /* Not Counted */ WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 2); close(fd); return 0; } static bool wp_ro_supported(void) { #if defined (__x86_64__) || defined (__i386__) return false; #else return true; #endif } static const char *wp_ro_skip_msg(void) { #if defined (__x86_64__) || defined (__i386__) return "missing hardware support"; #else return NULL; #endif } static struct { const char *desc; int (*target_func)(void); bool (*is_supported)(void); const char *(*skip_msg)(void); } wp_testcase_table[] = { { .desc = "Read Only Watchpoint", .target_func = &wp_ro_test, .is_supported = &wp_ro_supported, .skip_msg = &wp_ro_skip_msg, }, { .desc = "Write Only Watchpoint", .target_func = &wp_wo_test, }, { .desc = "Read / Write Watchpoint", .target_func = &wp_rw_test, }, { .desc = "Modify Watchpoint", .target_func = &wp_modify_test, }, }; int test__wp_subtest_get_nr(void) { return (int)ARRAY_SIZE(wp_testcase_table); } const char *test__wp_subtest_get_desc(int i) { if (i < 0 || i >= (int)ARRAY_SIZE(wp_testcase_table)) return NULL; return wp_testcase_table[i].desc; } const char *test__wp_subtest_skip_reason(int i) { if (i < 0 || i >= (int)ARRAY_SIZE(wp_testcase_table)) return NULL; if (!wp_testcase_table[i].skip_msg) return NULL; return wp_testcase_table[i].skip_msg(); } int test__wp(struct test *test __maybe_unused, int i) { if (i < 0 || i >= (int)ARRAY_SIZE(wp_testcase_table)) return TEST_FAIL; if (wp_testcase_table[i].is_supported && !wp_testcase_table[i].is_supported()) return TEST_SKIP; return !wp_testcase_table[i].target_func() ? TEST_OK : TEST_FAIL; } /* The s390 so far does not have support for * instruction breakpoint using the perf_event_open() system call. */ bool test__wp_is_supported(void) { #if defined(__s390x__) return false; #else return true; #endif }