perf test: Add watchpoint test (2e85d597) · Commits · 戴 / test

tools/perf/tests/Build

+1 −0

Original line number	Diff line number	Diff line
		@@ -21,6 +21,7 @@ perf-y += python-use.o
		perf-y += bp_signal.o
		perf-y += bp_signal_overflow.o
		perf-y += bp_account.o
		perf-y += wp.o
		perf-y += task-exit.o
		perf-y += sw-clock.o
		perf-y += mmap-thread-lookup.o

tools/perf/tests/builtin-test.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -120,6 +120,15 @@ static struct test generic_tests[] = {
		.func = test__bp_accounting,
		.is_supported = test__bp_signal_is_supported,
		},
		{
		.desc = "Watchpoint",
		.func = test__wp,
		.subtest = {
		.skip_if_fail = false,
		.get_nr = test__wp_subtest_get_nr,
		.get_desc = test__wp_subtest_get_desc,
		},
		},
		{
		.desc = "Number of exit events of a simple workload",
		.func = test__task_exit,

tools/perf/tests/tests.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -59,6 +59,9 @@ int test__python_use(struct test *test, int subtest);
		int test__bp_signal(struct test *test, int subtest);
		int test__bp_signal_overflow(struct test *test, int subtest);
		int test__bp_accounting(struct test *test, int subtest);
		int test__wp(struct test *test, int subtest);
		const char *test__wp_subtest_get_desc(int subtest);
		int test__wp_subtest_get_nr(void);
		int test__task_exit(struct test *test, int subtest);
		int test__mem(struct test *test, int subtest);
		int test__sw_clock_freq(struct test *test, int subtest);

tools/perf/tests/wp.c

0 → 100644

+229 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		#include <stdlib.h>
		#include <sys/ioctl.h>
		#include <linux/hw_breakpoint.h>
		#include "tests.h"
		#include "debug.h"
		#include "cloexec.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;
		}

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