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linux-zen-server/tools/testing/selftests/powerpc/ptrace/perf-hwbreak.c

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Initial commit
2023-08-30 17:53:23 +02:00
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* perf events self profiling example test case for hw breakpoints.
*
* This tests perf PERF_TYPE_BREAKPOINT parameters
* 1) tests all variants of the break on read/write flags
* 2) tests exclude_user == 0 and 1
* 3) test array matches (if DAWR is supported))
* 4) test different numbers of breakpoints matches
*
* Configure this breakpoint, then read and write the data a number of
* times. Then check the output count from perf is as expected.
*
* Based on:
* http://ozlabs.org/~anton/junkcode/perf_events_example1.c
*
* Copyright (C) 2018 Michael Neuling, IBM Corporation.
*/
#define _GNU_SOURCE
#include <unistd.h>
#include <assert.h>
#include <sched.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <sys/ptrace.h>
#include <sys/resource.h>
#include <sys/sysinfo.h>
#include <asm/ptrace.h>
#include <elf.h>
#include <pthread.h>
#include <sys/syscall.h>
#include <linux/perf_event.h>
#include <linux/hw_breakpoint.h>
#include "utils.h"
#ifndef PPC_DEBUG_FEATURE_DATA_BP_ARCH_31
#define PPC_DEBUG_FEATURE_DATA_BP_ARCH_31 0x20
#endif
#define MAX_LOOPS 10000
#define DAWR_LENGTH_MAX ((0x3f + 1) * 8)
int nprocs;
static volatile int a = 10;
static volatile int b = 10;
static volatile char c[512 + 8] __attribute__((aligned(512)));
static void perf_event_attr_set(struct perf_event_attr *attr,
__u32 type, __u64 addr, __u64 len,
bool exclude_user)
{
memset(attr, 0, sizeof(struct perf_event_attr));
attr->type = PERF_TYPE_BREAKPOINT;
attr->size = sizeof(struct perf_event_attr);
attr->bp_type = type;
attr->bp_addr = addr;
attr->bp_len = len;
attr->exclude_kernel = 1;
attr->exclude_hv = 1;
attr->exclude_guest = 1;
attr->exclude_user = exclude_user;
attr->disabled = 1;
}
static int
perf_process_event_open_exclude_user(__u32 type, __u64 addr, __u64 len, bool exclude_user)
{
struct perf_event_attr attr;
perf_event_attr_set(&attr, type, addr, len, exclude_user);
return syscall(__NR_perf_event_open, &attr, getpid(), -1, -1, 0);
}
static int perf_process_event_open(__u32 type, __u64 addr, __u64 len)
{
struct perf_event_attr attr;
perf_event_attr_set(&attr, type, addr, len, 0);
return syscall(__NR_perf_event_open, &attr, getpid(), -1, -1, 0);
}
static int perf_cpu_event_open(long cpu, __u32 type, __u64 addr, __u64 len)
{
struct perf_event_attr attr;
perf_event_attr_set(&attr, type, addr, len, 0);
return syscall(__NR_perf_event_open, &attr, -1, cpu, -1, 0);
}
static void close_fds(int *fd, int n)
{
int i;
for (i = 0; i < n; i++)
close(fd[i]);
}
static unsigned long read_fds(int *fd, int n)
{
int i;
unsigned long c = 0;
unsigned long count = 0;
size_t res;
for (i = 0; i < n; i++) {
res = read(fd[i], &c, sizeof(c));
assert(res == sizeof(unsigned long long));
count += c;
}
return count;
}
static void reset_fds(int *fd, int n)
{
int i;
for (i = 0; i < n; i++)
ioctl(fd[i], PERF_EVENT_IOC_RESET);
}
static void enable_fds(int *fd, int n)
{
int i;
for (i = 0; i < n; i++)
ioctl(fd[i], PERF_EVENT_IOC_ENABLE);
}
static void disable_fds(int *fd, int n)
{
int i;
for (i = 0; i < n; i++)
ioctl(fd[i], PERF_EVENT_IOC_DISABLE);
}
static int perf_systemwide_event_open(int *fd, __u32 type, __u64 addr, __u64 len)
{
int i, ncpus, cpu, ret = 0;
struct rlimit rlim;
cpu_set_t *mask;
size_t size;
if (getrlimit(RLIMIT_NOFILE, &rlim)) {
perror("getrlimit");
return -1;
}
rlim.rlim_cur = 65536;
if (setrlimit(RLIMIT_NOFILE, &rlim)) {
perror("setrlimit");
return -1;
}
ncpus = get_nprocs_conf();
size = CPU_ALLOC_SIZE(ncpus);
mask = CPU_ALLOC(ncpus);
if (!mask) {
perror("malloc");
return -1;
}
CPU_ZERO_S(size, mask);
if (sched_getaffinity(0, size, mask)) {
perror("sched_getaffinity");
ret = -1;
goto done;
}
for (i = 0, cpu = 0; i < nprocs && cpu < ncpus; cpu++) {
if (!CPU_ISSET_S(cpu, size, mask))
continue;
fd[i] = perf_cpu_event_open(cpu, type, addr, len);
if (fd[i] < 0) {
perror("perf_systemwide_event_open");
close_fds(fd, i);
ret = fd[i];
goto done;
}
i++;
}
if (i < nprocs) {
printf("Error: Number of online cpus reduced since start of test: %d < %d\n", i, nprocs);
close_fds(fd, i);
ret = -1;
}
done:
CPU_FREE(mask);
return ret;
}
static inline bool breakpoint_test(int len)
{
int fd;
/* bp_addr can point anywhere but needs to be aligned */
fd = perf_process_event_open(HW_BREAKPOINT_R, (__u64)(&fd) & 0xfffffffffffff800, len);
if (fd < 0)
return false;
close(fd);
return true;
}
static inline bool perf_breakpoint_supported(void)
{
return breakpoint_test(4);
}
static inline bool dawr_supported(void)
{
return breakpoint_test(DAWR_LENGTH_MAX);
}
static int runtestsingle(int readwriteflag, int exclude_user, int arraytest)
{
int i,j;
size_t res;
unsigned long long breaks, needed;
int readint;
int readintarraybig[2*DAWR_LENGTH_MAX/sizeof(int)];
int *readintalign;
volatile int *ptr;
int break_fd;
int loop_num = MAX_LOOPS - (rand() % 100); /* provide some variability */
volatile int *k;
__u64 len;
/* align to 0x400 boundary as required by DAWR */
readintalign = (int *)(((unsigned long)readintarraybig + 0x7ff) &
0xfffffffffffff800);
ptr = &readint;
if (arraytest)
ptr = &readintalign[0];
len = arraytest ? DAWR_LENGTH_MAX : sizeof(int);
break_fd = perf_process_event_open_exclude_user(readwriteflag, (__u64)ptr,
len, exclude_user);
if (break_fd < 0) {
perror("perf_process_event_open_exclude_user");
exit(1);
}
/* start counters */
ioctl(break_fd, PERF_EVENT_IOC_ENABLE);
/* Test a bunch of reads and writes */
k = &readint;
for (i = 0; i < loop_num; i++) {
if (arraytest)
k = &(readintalign[i % (DAWR_LENGTH_MAX/sizeof(int))]);
j = *k;
*k = j;
}
/* stop counters */
ioctl(break_fd, PERF_EVENT_IOC_DISABLE);
/* read and check counters */
res = read(break_fd, &breaks, sizeof(unsigned long long));
assert(res == sizeof(unsigned long long));
/* we read and write each loop, so subtract the ones we are counting */
needed = 0;
if (readwriteflag & HW_BREAKPOINT_R)
needed += loop_num;
if (readwriteflag & HW_BREAKPOINT_W)
needed += loop_num;
needed = needed * (1 - exclude_user);
printf("TESTED: addr:0x%lx brks:% 8lld loops:% 8i rw:%i !user:%i array:%i\n",
(unsigned long int)ptr, breaks, loop_num, readwriteflag, exclude_user, arraytest);
if (breaks != needed) {
printf("FAILED: 0x%lx brks:%lld needed:%lli %i %i %i\n\n",
(unsigned long int)ptr, breaks, needed, loop_num, readwriteflag, exclude_user);
return 1;
}
close(break_fd);
return 0;
}
static int runtest_dar_outside(void)
{
void *target;
volatile __u16 temp16;
volatile __u64 temp64;
int break_fd;
unsigned long long breaks;
int fail = 0;
size_t res;
target = malloc(8);
if (!target) {
perror("malloc failed");
exit(EXIT_FAILURE);
}
/* watch middle half of target array */
break_fd = perf_process_event_open(HW_BREAKPOINT_RW, (__u64)(target + 2), 4);
if (break_fd < 0) {
free(target);
perror("perf_process_event_open");
exit(EXIT_FAILURE);
}
/* Shouldn't hit. */
ioctl(break_fd, PERF_EVENT_IOC_RESET);
ioctl(break_fd, PERF_EVENT_IOC_ENABLE);
temp16 = *((__u16 *)target);
*((__u16 *)target) = temp16;
ioctl(break_fd, PERF_EVENT_IOC_DISABLE);
res = read(break_fd, &breaks, sizeof(unsigned long long));
assert(res == sizeof(unsigned long long));
if (breaks == 0) {
printf("TESTED: No overlap\n");
} else {
printf("FAILED: No overlap: %lld != 0\n", breaks);
fail = 1;
}
/* Hit */
ioctl(break_fd, PERF_EVENT_IOC_RESET);
ioctl(break_fd, PERF_EVENT_IOC_ENABLE);
temp16 = *((__u16 *)(target + 1));
*((__u16 *)(target + 1)) = temp16;
ioctl(break_fd, PERF_EVENT_IOC_DISABLE);
res = read(break_fd, &breaks, sizeof(unsigned long long));
assert(res == sizeof(unsigned long long));
if (breaks == 2) {
printf("TESTED: Partial overlap\n");
} else {
printf("FAILED: Partial overlap: %lld != 2\n", breaks);
fail = 1;
}
/* Hit */
ioctl(break_fd, PERF_EVENT_IOC_RESET);
ioctl(break_fd, PERF_EVENT_IOC_ENABLE);
temp16 = *((__u16 *)(target + 5));
*((__u16 *)(target + 5)) = temp16;
ioctl(break_fd, PERF_EVENT_IOC_DISABLE);
res = read(break_fd, &breaks, sizeof(unsigned long long));
assert(res == sizeof(unsigned long long));
if (breaks == 2) {
printf("TESTED: Partial overlap\n");
} else {
printf("FAILED: Partial overlap: %lld != 2\n", breaks);
fail = 1;
}
/* Shouldn't Hit */
ioctl(break_fd, PERF_EVENT_IOC_RESET);
ioctl(break_fd, PERF_EVENT_IOC_ENABLE);
temp16 = *((__u16 *)(target + 6));
*((__u16 *)(target + 6)) = temp16;
ioctl(break_fd, PERF_EVENT_IOC_DISABLE);
res = read(break_fd, &breaks, sizeof(unsigned long long));
assert(res == sizeof(unsigned long long));
if (breaks == 0) {
printf("TESTED: No overlap\n");
} else {
printf("FAILED: No overlap: %lld != 0\n", breaks);
fail = 1;
}
/* Hit */
ioctl(break_fd, PERF_EVENT_IOC_RESET);
ioctl(break_fd, PERF_EVENT_IOC_ENABLE);
temp64 = *((__u64 *)target);
*((__u64 *)target) = temp64;
ioctl(break_fd, PERF_EVENT_IOC_DISABLE);
res = read(break_fd, &breaks, sizeof(unsigned long long));
assert(res == sizeof(unsigned long long));
if (breaks == 2) {
printf("TESTED: Full overlap\n");
} else {
printf("FAILED: Full overlap: %lld != 2\n", breaks);
fail = 1;
}
free(target);
close(break_fd);
return fail;
}
static void multi_dawr_workload(void)
{
a += 10;
b += 10;
c[512 + 1] += 'a';
}
static int test_process_multi_diff_addr(void)
{
unsigned long long breaks1 = 0, breaks2 = 0;
int fd1, fd2;
char *desc = "Process specific, Two events, diff addr";
size_t res;
fd1 = perf_process_event_open(HW_BREAKPOINT_RW, (__u64)&a, (__u64)sizeof(a));
if (fd1 < 0) {
perror("perf_process_event_open");
exit(EXIT_FAILURE);
}
fd2 = perf_process_event_open(HW_BREAKPOINT_RW, (__u64)&b, (__u64)sizeof(b));
if (fd2 < 0) {
close(fd1);
perror("perf_process_event_open");
exit(EXIT_FAILURE);
}
ioctl(fd1, PERF_EVENT_IOC_RESET);
ioctl(fd2, PERF_EVENT_IOC_RESET);
ioctl(fd1, PERF_EVENT_IOC_ENABLE);
ioctl(fd2, PERF_EVENT_IOC_ENABLE);
multi_dawr_workload();
ioctl(fd1, PERF_EVENT_IOC_DISABLE);
ioctl(fd2, PERF_EVENT_IOC_DISABLE);
res = read(fd1, &breaks1, sizeof(breaks1));
assert(res == sizeof(unsigned long long));
res = read(fd2, &breaks2, sizeof(breaks2));
assert(res == sizeof(unsigned long long));
close(fd1);
close(fd2);
if (breaks1 != 2 || breaks2 != 2) {
printf("FAILED: %s: %lld != 2 || %lld != 2\n", desc, breaks1, breaks2);
return 1;
}
printf("TESTED: %s\n", desc);
return 0;
}
static int test_process_multi_same_addr(void)
{
unsigned long long breaks1 = 0, breaks2 = 0;
int fd1, fd2;
char *desc = "Process specific, Two events, same addr";
size_t res;
fd1 = perf_process_event_open(HW_BREAKPOINT_RW, (__u64)&a, (__u64)sizeof(a));
if (fd1 < 0) {
perror("perf_process_event_open");
exit(EXIT_FAILURE);
}
fd2 = perf_process_event_open(HW_BREAKPOINT_RW, (__u64)&a, (__u64)sizeof(a));
if (fd2 < 0) {
close(fd1);
perror("perf_process_event_open");
exit(EXIT_FAILURE);
}
ioctl(fd1, PERF_EVENT_IOC_RESET);
ioctl(fd2, PERF_EVENT_IOC_RESET);
ioctl(fd1, PERF_EVENT_IOC_ENABLE);
ioctl(fd2, PERF_EVENT_IOC_ENABLE);
multi_dawr_workload();
ioctl(fd1, PERF_EVENT_IOC_DISABLE);
ioctl(fd2, PERF_EVENT_IOC_DISABLE);
res = read(fd1, &breaks1, sizeof(breaks1));
assert(res == sizeof(unsigned long long));
res = read(fd2, &breaks2, sizeof(breaks2));
assert(res == sizeof(unsigned long long));
close(fd1);
close(fd2);
if (breaks1 != 2 || breaks2 != 2) {
printf("FAILED: %s: %lld != 2 || %lld != 2\n", desc, breaks1, breaks2);
return 1;
}
printf("TESTED: %s\n", desc);
return 0;
}
static int test_process_multi_diff_addr_ro_wo(void)
{
unsigned long long breaks1 = 0, breaks2 = 0;
int fd1, fd2;
char *desc = "Process specific, Two events, diff addr, one is RO, other is WO";
size_t res;
fd1 = perf_process_event_open(HW_BREAKPOINT_W, (__u64)&a, (__u64)sizeof(a));
if (fd1 < 0) {
perror("perf_process_event_open");
exit(EXIT_FAILURE);
}
fd2 = perf_process_event_open(HW_BREAKPOINT_R, (__u64)&b, (__u64)sizeof(b));
if (fd2 < 0) {
close(fd1);
perror("perf_process_event_open");
exit(EXIT_FAILURE);
}
ioctl(fd1, PERF_EVENT_IOC_RESET);
ioctl(fd2, PERF_EVENT_IOC_RESET);
ioctl(fd1, PERF_EVENT_IOC_ENABLE);
ioctl(fd2, PERF_EVENT_IOC_ENABLE);
multi_dawr_workload();
ioctl(fd1, PERF_EVENT_IOC_DISABLE);
ioctl(fd2, PERF_EVENT_IOC_DISABLE);
res = read(fd1, &breaks1, sizeof(breaks1));
assert(res == sizeof(unsigned long long));
res = read(fd2, &breaks2, sizeof(breaks2));
assert(res == sizeof(unsigned long long));
close(fd1);
close(fd2);
if (breaks1 != 1 || breaks2 != 1) {
printf("FAILED: %s: %lld != 1 || %lld != 1\n", desc, breaks1, breaks2);
return 1;
}
printf("TESTED: %s\n", desc);
return 0;
}
static int test_process_multi_same_addr_ro_wo(void)
{
unsigned long long breaks1 = 0, breaks2 = 0;
int fd1, fd2;
char *desc = "Process specific, Two events, same addr, one is RO, other is WO";
size_t res;
fd1 = perf_process_event_open(HW_BREAKPOINT_R, (__u64)&a, (__u64)sizeof(a));
if (fd1 < 0) {
perror("perf_process_event_open");
exit(EXIT_FAILURE);
}
fd2 = perf_process_event_open(HW_BREAKPOINT_W, (__u64)&a, (__u64)sizeof(a));
if (fd2 < 0) {
close(fd1);
perror("perf_process_event_open");
exit(EXIT_FAILURE);
}
ioctl(fd1, PERF_EVENT_IOC_RESET);
ioctl(fd2, PERF_EVENT_IOC_RESET);
ioctl(fd1, PERF_EVENT_IOC_ENABLE);
ioctl(fd2, PERF_EVENT_IOC_ENABLE);
multi_dawr_workload();
ioctl(fd1, PERF_EVENT_IOC_DISABLE);
ioctl(fd2, PERF_EVENT_IOC_DISABLE);
res = read(fd1, &breaks1, sizeof(breaks1));
assert(res == sizeof(unsigned long long));
res = read(fd2, &breaks2, sizeof(breaks2));
assert(res == sizeof(unsigned long long));
close(fd1);
close(fd2);
if (breaks1 != 1 || breaks2 != 1) {
printf("FAILED: %s: %lld != 1 || %lld != 1\n", desc, breaks1, breaks2);
return 1;
}
printf("TESTED: %s\n", desc);
return 0;
}
static int test_syswide_multi_diff_addr(void)
{
unsigned long long breaks1 = 0, breaks2 = 0;
int *fd1 = malloc(nprocs * sizeof(int));
int *fd2 = malloc(nprocs * sizeof(int));
char *desc = "Systemwide, Two events, diff addr";
int ret;
ret = perf_systemwide_event_open(fd1, HW_BREAKPOINT_RW, (__u64)&a, (__u64)sizeof(a));
if (ret)
exit(EXIT_FAILURE);
ret = perf_systemwide_event_open(fd2, HW_BREAKPOINT_RW, (__u64)&b, (__u64)sizeof(b));
if (ret) {
close_fds(fd1, nprocs);
exit(EXIT_FAILURE);
}
reset_fds(fd1, nprocs);
reset_fds(fd2, nprocs);
enable_fds(fd1, nprocs);
enable_fds(fd2, nprocs);
multi_dawr_workload();
disable_fds(fd1, nprocs);
disable_fds(fd2, nprocs);
breaks1 = read_fds(fd1, nprocs);
breaks2 = read_fds(fd2, nprocs);
close_fds(fd1, nprocs);
close_fds(fd2, nprocs);
free(fd1);
free(fd2);
if (breaks1 != 2 || breaks2 != 2) {
printf("FAILED: %s: %lld != 2 || %lld != 2\n", desc, breaks1, breaks2);
return 1;
}
printf("TESTED: %s\n", desc);
return 0;
}
static int test_syswide_multi_same_addr(void)
{
unsigned long long breaks1 = 0, breaks2 = 0;
int *fd1 = malloc(nprocs * sizeof(int));
int *fd2 = malloc(nprocs * sizeof(int));
char *desc = "Systemwide, Two events, same addr";
int ret;
ret = perf_systemwide_event_open(fd1, HW_BREAKPOINT_RW, (__u64)&a, (__u64)sizeof(a));
if (ret)
exit(EXIT_FAILURE);
ret = perf_systemwide_event_open(fd2, HW_BREAKPOINT_RW, (__u64)&a, (__u64)sizeof(a));
if (ret) {
close_fds(fd1, nprocs);
exit(EXIT_FAILURE);
}
reset_fds(fd1, nprocs);
reset_fds(fd2, nprocs);
enable_fds(fd1, nprocs);
enable_fds(fd2, nprocs);
multi_dawr_workload();
disable_fds(fd1, nprocs);
disable_fds(fd2, nprocs);
breaks1 = read_fds(fd1, nprocs);
breaks2 = read_fds(fd2, nprocs);
close_fds(fd1, nprocs);
close_fds(fd2, nprocs);
free(fd1);
free(fd2);
if (breaks1 != 2 || breaks2 != 2) {
printf("FAILED: %s: %lld != 2 || %lld != 2\n", desc, breaks1, breaks2);
return 1;
}
printf("TESTED: %s\n", desc);
return 0;
}
static int test_syswide_multi_diff_addr_ro_wo(void)
{
unsigned long long breaks1 = 0, breaks2 = 0;
int *fd1 = malloc(nprocs * sizeof(int));
int *fd2 = malloc(nprocs * sizeof(int));
char *desc = "Systemwide, Two events, diff addr, one is RO, other is WO";
int ret;
ret = perf_systemwide_event_open(fd1, HW_BREAKPOINT_W, (__u64)&a, (__u64)sizeof(a));
if (ret)
exit(EXIT_FAILURE);
ret = perf_systemwide_event_open(fd2, HW_BREAKPOINT_R, (__u64)&b, (__u64)sizeof(b));
if (ret) {
close_fds(fd1, nprocs);
exit(EXIT_FAILURE);
}
reset_fds(fd1, nprocs);
reset_fds(fd2, nprocs);
enable_fds(fd1, nprocs);
enable_fds(fd2, nprocs);
multi_dawr_workload();
disable_fds(fd1, nprocs);
disable_fds(fd2, nprocs);
breaks1 = read_fds(fd1, nprocs);
breaks2 = read_fds(fd2, nprocs);
close_fds(fd1, nprocs);
close_fds(fd2, nprocs);
free(fd1);
free(fd2);
if (breaks1 != 1 || breaks2 != 1) {
printf("FAILED: %s: %lld != 1 || %lld != 1\n", desc, breaks1, breaks2);
return 1;
}
printf("TESTED: %s\n", desc);
return 0;
}
static int test_syswide_multi_same_addr_ro_wo(void)
{
unsigned long long breaks1 = 0, breaks2 = 0;
int *fd1 = malloc(nprocs * sizeof(int));
int *fd2 = malloc(nprocs * sizeof(int));
char *desc = "Systemwide, Two events, same addr, one is RO, other is WO";
int ret;
ret = perf_systemwide_event_open(fd1, HW_BREAKPOINT_W, (__u64)&a, (__u64)sizeof(a));
if (ret)
exit(EXIT_FAILURE);
ret = perf_systemwide_event_open(fd2, HW_BREAKPOINT_R, (__u64)&a, (__u64)sizeof(a));
if (ret) {
close_fds(fd1, nprocs);
exit(EXIT_FAILURE);
}
reset_fds(fd1, nprocs);
reset_fds(fd2, nprocs);
enable_fds(fd1, nprocs);
enable_fds(fd2, nprocs);
multi_dawr_workload();
disable_fds(fd1, nprocs);
disable_fds(fd2, nprocs);
breaks1 = read_fds(fd1, nprocs);
breaks2 = read_fds(fd2, nprocs);
close_fds(fd1, nprocs);
close_fds(fd2, nprocs);
free(fd1);
free(fd2);
if (breaks1 != 1 || breaks2 != 1) {
printf("FAILED: %s: %lld != 1 || %lld != 1\n", desc, breaks1, breaks2);
return 1;
}
printf("TESTED: %s\n", desc);
return 0;
}
static int runtest_multi_dawr(void)
{
int ret = 0;
ret |= test_process_multi_diff_addr();
ret |= test_process_multi_same_addr();
ret |= test_process_multi_diff_addr_ro_wo();
ret |= test_process_multi_same_addr_ro_wo();
ret |= test_syswide_multi_diff_addr();
ret |= test_syswide_multi_same_addr();
ret |= test_syswide_multi_diff_addr_ro_wo();
ret |= test_syswide_multi_same_addr_ro_wo();
return ret;
}
static int runtest_unaligned_512bytes(void)
{
unsigned long long breaks = 0;
int fd;
char *desc = "Process specific, 512 bytes, unaligned";
__u64 addr = (__u64)&c + 8;
size_t res;
fd = perf_process_event_open(HW_BREAKPOINT_RW, addr, 512);
if (fd < 0) {
perror("perf_process_event_open");
exit(EXIT_FAILURE);
}
ioctl(fd, PERF_EVENT_IOC_RESET);
ioctl(fd, PERF_EVENT_IOC_ENABLE);
multi_dawr_workload();
ioctl(fd, PERF_EVENT_IOC_DISABLE);
res = read(fd, &breaks, sizeof(breaks));
assert(res == sizeof(unsigned long long));
close(fd);
if (breaks != 2) {
printf("FAILED: %s: %lld != 2\n", desc, breaks);
return 1;
}
printf("TESTED: %s\n", desc);
return 0;
}
/* There is no perf api to find number of available watchpoints. Use ptrace. */
static int get_nr_wps(bool *arch_31)
{
struct ppc_debug_info dbginfo;
int child_pid;
child_pid = fork();
if (!child_pid) {
int ret = ptrace(PTRACE_TRACEME, 0, NULL, 0);
if (ret) {
perror("PTRACE_TRACEME failed\n");
exit(EXIT_FAILURE);
}
kill(getpid(), SIGUSR1);
sleep(1);
exit(EXIT_SUCCESS);
}
wait(NULL);
if (ptrace(PPC_PTRACE_GETHWDBGINFO, child_pid, NULL, &dbginfo)) {
perror("Can't get breakpoint info");
exit(EXIT_FAILURE);
}
*arch_31 = !!(dbginfo.features & PPC_DEBUG_FEATURE_DATA_BP_ARCH_31);
return dbginfo.num_data_bps;
}
static int runtest(void)
{
int rwflag;
int exclude_user;
int ret;
bool dawr = dawr_supported();
bool arch_31 = false;
int nr_wps = get_nr_wps(&arch_31);
/*
* perf defines rwflag as two bits read and write and at least
* one must be set. So range 1-3.
*/
for (rwflag = 1 ; rwflag < 4; rwflag++) {
for (exclude_user = 0 ; exclude_user < 2; exclude_user++) {
ret = runtestsingle(rwflag, exclude_user, 0);
if (ret)
return ret;
/* if we have the dawr, we can do an array test */
if (!dawr)
continue;
ret = runtestsingle(rwflag, exclude_user, 1);
if (ret)
return ret;
}
}
ret = runtest_dar_outside();
if (ret)
return ret;
if (dawr && nr_wps > 1) {
nprocs = get_nprocs();
ret = runtest_multi_dawr();
if (ret)
return ret;
}
if (dawr && arch_31)
ret = runtest_unaligned_512bytes();
return ret;
}
static int perf_hwbreak(void)
{
srand ( time(NULL) );
SKIP_IF(!perf_breakpoint_supported());
return runtest();
}
int main(int argc, char *argv[], char **envp)
{
return test_harness(perf_hwbreak, "perf_hwbreak");
}