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