// SPDX-License-Identifier: GPL-2.0#include <stdlib.h>#include <string.h>#include <unistd.h>#include <errno.h>#include <sys/ioctl.h>#include <linux/compiler.h>#include <linux/hw_breakpoint.h>#include <linux/kernel.h>#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) #ifdef __i386__/* Only breakpoint length less-than 8 has hardware support on i386. */static volatile u32 data1;#elsestatic volatile u64 data1;#endifstatic volatile u8 data2[3]; #ifndef __s390x__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) {		fd = -errno;		pr_debug("failed opening event %x\n", attr.bp_type);	} 	return fd;}#endif static int test__wp_ro(struct test_suite *test __maybe_unused,		       int subtest __maybe_unused){#if defined(__s390x__) || defined(__x86_64__) || defined(__i386__)	return TEST_SKIP;#else	int fd;	unsigned long tmp, tmp1 = rand(); 	fd = __event(HW_BREAKPOINT_R, (void *)&data1, sizeof(data1));	if (fd < 0)		return fd == -ENODEV ? TEST_SKIP : -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;#endif} static int test__wp_wo(struct test_suite *test __maybe_unused,		       int subtest __maybe_unused){#if defined(__s390x__)	return TEST_SKIP;#else	int fd;	unsigned long tmp, tmp1 = rand(); 	fd = __event(HW_BREAKPOINT_W, (void *)&data1, sizeof(data1));	if (fd < 0)		return fd == -ENODEV ? TEST_SKIP : -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;#endif} static int test__wp_rw(struct test_suite *test __maybe_unused,		       int subtest __maybe_unused){#if defined(__s390x__)	return TEST_SKIP;#else	int fd;	unsigned long tmp, tmp1 = rand(); 	fd = __event(HW_BREAKPOINT_R | HW_BREAKPOINT_W, (void *)&data1,		     sizeof(data1));	if (fd < 0)		return fd == -ENODEV ? TEST_SKIP : -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;#endif} static int test__wp_modify(struct test_suite *test __maybe_unused, int subtest __maybe_unused){#if defined(__s390x__)	return TEST_SKIP;#else	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 fd == -ENODEV ? TEST_SKIP : -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) {		if (errno == ENOTTY) {			test->test_cases[subtest].skip_reason = "missing kernel support";			ret = TEST_SKIP;		} 		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;#endif} static struct test_case wp_tests[] = {	TEST_CASE_REASON("Read Only Watchpoint", wp_ro, "missing hardware support"),	TEST_CASE_REASON("Write Only Watchpoint", wp_wo, "missing hardware support"),	TEST_CASE_REASON("Read / Write Watchpoint", wp_rw, "missing hardware support"),	TEST_CASE_REASON("Modify Watchpoint", wp_modify, "missing hardware support"),	{ .name = NULL, }}; struct test_suite suite__wp = {	.desc = "Watchpoint",	.test_cases = wp_tests,};