perf test: Add watchpoint test

We don't have a 'perf test' entry available to test the watchpoint
functionality.

Add a simple set of tests:

 - Read only watchpoint
 - Write only watchpoint
 - Read / Write watchpoint
 - Runtime watchpoint modification

Ex.: on powerpc:

  $ sudo perf test 22
  22: Watchpoint                                            :
  22.1: Read Only Watchpoint                                : Ok
  22.2: Write Only Watchpoint                               : Ok
  22.3: Read / Write Watchpoint                             : Ok
  22.4: Modify Watchpoint                                   : Ok

Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Hendrik Brueckner <brueckner@linux.ibm.com>
Cc: Kate Stewart <kstewart@linuxfoundation.org>
Cc: Kim Phillips <kim.phillips@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Cc: Sandipan Das <sandipan@linux.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Link: http://lkml.kernel.org/r/20180912061229.22832-1-ravi.bangoria@linux.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

4 files changed, 242 insertions, 0 deletions

diff --git a/tools/perf/tests/Build b/tools/perf/tests/Build
index 6c108fa79ae3..0b2b8305c965 100644
--- a/tools/perf/tests/Build
+++ b/tools/perf/tests/Build
@@ -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
diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index d7a5e1b9aa6f..54ca7d87236f 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -121,6 +121,15 @@ static struct test generic_tests[] = {
                 .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,
         },
diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
index a9760e790563..8e26a4148f30 100644
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -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);
diff --git a/tools/perf/tests/wp.c b/tools/perf/tests/wp.c
new file mode 100644
index 000000000000..017a99317f94
--- /dev/null
+++ b/tools/perf/tests/wp.c
@@ -0,0 +1,229 @@
+// 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;
+}