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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
commit5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch)
treea94efe259b9009378be6d90eb30d2b019d95c194 /tools/perf/tests/wp.c
parentInitial commit. (diff)
downloadlinux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.tar.xz
linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.zip
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--tools/perf/tests/wp.c246
1 files changed, 246 insertions, 0 deletions
diff --git a/tools/perf/tests/wp.c b/tools/perf/tests/wp.c
new file mode 100644
index 000000000..d262d6639
--- /dev/null
+++ b/tools/perf/tests/wp.c
@@ -0,0 +1,246 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/ioctl.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];
+
+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;
+}
+
+static int wp_ro_test(void)
+{
+ 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;
+}
+
+static int wp_wo_test(void)
+{
+ 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;
+}
+
+static int wp_rw_test(void)
+{
+ 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;
+}
+
+static int wp_modify_test(void)
+{
+ 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) {
+ 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;
+}
+
+static bool wp_ro_supported(void)
+{
+#if defined (__x86_64__) || defined (__i386__)
+ return false;
+#else
+ return true;
+#endif
+}
+
+static void wp_ro_skip_msg(void)
+{
+#if defined (__x86_64__) || defined (__i386__)
+ pr_debug("Hardware does not support read only watchpoints.\n");
+#endif
+}
+
+static struct {
+ const char *desc;
+ int (*target_func)(void);
+ bool (*is_supported)(void);
+ void (*skip_msg)(void);
+} wp_testcase_table[] = {
+ {
+ .desc = "Read Only Watchpoint",
+ .target_func = &wp_ro_test,
+ .is_supported = &wp_ro_supported,
+ .skip_msg = &wp_ro_skip_msg,
+ },
+ {
+ .desc = "Write Only Watchpoint",
+ .target_func = &wp_wo_test,
+ },
+ {
+ .desc = "Read / Write Watchpoint",
+ .target_func = &wp_rw_test,
+ },
+ {
+ .desc = "Modify Watchpoint",
+ .target_func = &wp_modify_test,
+ },
+};
+
+int test__wp_subtest_get_nr(void)
+{
+ return (int)ARRAY_SIZE(wp_testcase_table);
+}
+
+const char *test__wp_subtest_get_desc(int i)
+{
+ if (i < 0 || i >= (int)ARRAY_SIZE(wp_testcase_table))
+ return NULL;
+ return wp_testcase_table[i].desc;
+}
+
+int test__wp(struct test *test __maybe_unused, int i)
+{
+ if (i < 0 || i >= (int)ARRAY_SIZE(wp_testcase_table))
+ return TEST_FAIL;
+
+ if (wp_testcase_table[i].is_supported &&
+ !wp_testcase_table[i].is_supported()) {
+ wp_testcase_table[i].skip_msg();
+ return TEST_SKIP;
+ }
+
+ return !wp_testcase_table[i].target_func() ? TEST_OK : TEST_FAIL;
+}
+
+/* The s390 so far does not have support for
+ * instruction breakpoint using the perf_event_open() system call.
+ */
+bool test__wp_is_supported(void)
+{
+#if defined(__s390x__)
+ return false;
+#else
+ return true;
+#endif
+}