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-rw-r--r--tools/perf/tests/wp.c207
1 files changed, 207 insertions, 0 deletions
diff --git a/tools/perf/tests/wp.c b/tools/perf/tests/wp.c
new file mode 100644
index 000000000..56455da30
--- /dev/null
+++ b/tools/perf/tests/wp.c
@@ -0,0 +1,207 @@
+// 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)
+
+volatile u64 data1;
+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)
+ 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 -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 -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 -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 -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,
+};