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207 lines
4.7 KiB
207 lines
4.7 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 <errno.h> |
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#include <sys/ioctl.h> |
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#include <linux/compiler.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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#ifndef __s390x__ |
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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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#endif |
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static int test__wp_ro(struct test_suite *test __maybe_unused, |
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int subtest __maybe_unused) |
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{ |
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#if defined(__s390x__) || defined(__x86_64__) || defined(__i386__) |
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return TEST_SKIP; |
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#else |
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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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#endif |
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} |
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static int test__wp_wo(struct test_suite *test __maybe_unused, |
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int subtest __maybe_unused) |
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{ |
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#if defined(__s390x__) |
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return TEST_SKIP; |
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#else |
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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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#endif |
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} |
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static int test__wp_rw(struct test_suite *test __maybe_unused, |
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int subtest __maybe_unused) |
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{ |
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#if defined(__s390x__) |
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return TEST_SKIP; |
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#else |
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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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#endif |
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} |
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static int test__wp_modify(struct test_suite *test __maybe_unused, int subtest __maybe_unused) |
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{ |
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#if defined(__s390x__) |
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return TEST_SKIP; |
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#else |
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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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if (errno == ENOTTY) { |
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test->test_cases[subtest].skip_reason = "missing kernel support"; |
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ret = TEST_SKIP; |
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} |
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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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#endif |
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} |
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static struct test_case wp_tests[] = { |
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TEST_CASE_REASON("Read Only Watchpoint", wp_ro, "missing hardware support"), |
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TEST_CASE_REASON("Write Only Watchpoint", wp_wo, "missing hardware support"), |
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TEST_CASE_REASON("Read / Write Watchpoint", wp_rw, "missing hardware support"), |
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TEST_CASE_REASON("Modify Watchpoint", wp_modify, "missing hardware support"), |
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{ .name = NULL, } |
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}; |
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struct test_suite suite__wp = { |
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.desc = "Watchpoint", |
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.test_cases = wp_tests, |
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};
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