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Subject[PATCH v4 4/5] Powerpc/Watchpoint: Add dar outside test in perf-hwbreak.c selftest
Date
So far we used to ignore exception if dar points outside of user
specified range. But now we are ignoring it only if actual load/
store range does not overlap with user specified range. Include
selftests for the same:

# ./tools/testing/selftests/powerpc/ptrace/perf-hwbreak
...
TESTED: No overlap
TESTED: Partial overlap
TESTED: Partial overlap
TESTED: No overlap
TESTED: Full overlap
success: perf_hwbreak

Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
---
.../selftests/powerpc/ptrace/perf-hwbreak.c | 111 +++++++++++++++++-
1 file changed, 110 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/powerpc/ptrace/perf-hwbreak.c b/tools/testing/selftests/powerpc/ptrace/perf-hwbreak.c
index 200337daec42..389c545675c6 100644
--- a/tools/testing/selftests/powerpc/ptrace/perf-hwbreak.c
+++ b/tools/testing/selftests/powerpc/ptrace/perf-hwbreak.c
@@ -148,6 +148,113 @@ static int runtestsingle(int readwriteflag, int exclude_user, int arraytest)
return 0;
}

+static int runtest_dar_outside(void)
+{
+ volatile char target[8];
+ volatile __u16 temp16;
+ volatile __u64 temp64;
+ struct perf_event_attr attr;
+ int break_fd;
+ unsigned long long breaks;
+ int fail = 0;
+ size_t res;
+
+ /* setup counters */
+ memset(&attr, 0, sizeof(attr));
+ attr.disabled = 1;
+ attr.type = PERF_TYPE_BREAKPOINT;
+ attr.exclude_kernel = 1;
+ attr.exclude_hv = 1;
+ attr.exclude_guest = 1;
+ attr.bp_type = HW_BREAKPOINT_RW;
+ /* watch middle half of target array */
+ attr.bp_addr = (__u64)(target + 2);
+ attr.bp_len = 4;
+ break_fd = sys_perf_event_open(&attr, 0, -1, -1, 0);
+ if (break_fd < 0) {
+ perror("sys_perf_event_open");
+ exit(1);
+ }
+
+ /* 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;
+ }
+
+ close(break_fd);
+ return fail;
+}
+
static int runtest(void)
{
int rwflag;
@@ -172,7 +279,9 @@ static int runtest(void)
return ret;
}
}
- return 0;
+
+ ret = runtest_dar_outside();
+ return ret;
}


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