perf test: Add dso data caching tests

Adding automated test for DSO data reading. Testing raw/cached reads
from different file/cache locations.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Arun Sharma <asharma@fb.com>
Cc: Benjamin Redelings <benjamin.redelings@nescent.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Frank Ch. Eigler <fche@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
Cc: Ulrich Drepper <drepper@gmail.com>
Link: http://lkml.kernel.org/r/1342959280-5361-18-git-send-email-jolsa@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

4 files changed, 159 insertions, 0 deletions

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 75d74e5db8d5..e8f057983ae4 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -354,6 +354,7 @@ LIB_OBJS += $(OUTPUT)util/usage.o
 LIB_OBJS += $(OUTPUT)util/wrapper.o
 LIB_OBJS += $(OUTPUT)util/sigchain.o
 LIB_OBJS += $(OUTPUT)util/symbol.o
+LIB_OBJS += $(OUTPUT)util/dso-test-data.o
 LIB_OBJS += $(OUTPUT)util/color.o
 LIB_OBJS += $(OUTPUT)util/pager.o
 LIB_OBJS += $(OUTPUT)util/header.o
diff --git a/tools/perf/builtin-test.c b/tools/perf/builtin-test.c
index 5ce30305462b..d909eb74a0eb 100644
--- a/tools/perf/builtin-test.c
+++ b/tools/perf/builtin-test.c
@@ -1142,6 +1142,10 @@ static struct test {
                 .func = test__perf_pmu,
         },
         {
+                .desc = "Test dso data interface",
+                .func = dso__test_data,
+        },
+        {
                 .func = NULL,
         },
 };
diff --git a/tools/perf/util/dso-test-data.c b/tools/perf/util/dso-test-data.c
new file mode 100644
index 000000000000..541cdc72c7df
--- /dev/null
+++ b/tools/perf/util/dso-test-data.c
@@ -0,0 +1,153 @@
+#include "util.h"
+
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+
+#include "symbol.h"
+
+#define TEST_ASSERT_VAL(text, cond) \
+do { \
+        if (!(cond)) { \
+                pr_debug("FAILED %s:%d %s\n", __FILE__, __LINE__, text); \
+                return -1; \
+        } \
+} while (0)
+
+static char *test_file(int size)
+{
+        static char buf_templ[] = "/tmp/test-XXXXXX";
+        char *templ = buf_templ;
+        int fd, i;
+        unsigned char *buf;
+
+        fd = mkostemp(templ, O_CREAT|O_WRONLY|O_TRUNC);
+
+        buf = malloc(size);
+        if (!buf) {
+                close(fd);
+                return NULL;
+        }
+
+        for (i = 0; i < size; i++)
+                buf[i] = (unsigned char) ((int) i % 10);
+
+        if (size != write(fd, buf, size))
+                templ = NULL;
+
+        close(fd);
+        return templ;
+}
+
+#define TEST_FILE_SIZE (DSO__DATA_CACHE_SIZE * 20)
+
+struct test_data_offset {
+        off_t offset;
+        u8 data[10];
+        int size;
+};
+
+struct test_data_offset offsets[] = {
+        /* Fill first cache page. */
+        {
+                .offset = 10,
+                .data   = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
+                .size   = 10,
+        },
+        /* Read first cache page. */
+        {
+                .offset = 10,
+                .data   = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
+                .size   = 10,
+        },
+        /* Fill cache boundary pages. */
+        {
+                .offset = DSO__DATA_CACHE_SIZE - DSO__DATA_CACHE_SIZE % 10,
+                .data   = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
+                .size   = 10,
+        },
+        /* Read cache boundary pages. */
+        {
+                .offset = DSO__DATA_CACHE_SIZE - DSO__DATA_CACHE_SIZE % 10,
+                .data   = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
+                .size   = 10,
+        },
+        /* Fill final cache page. */
+        {
+                .offset = TEST_FILE_SIZE - 10,
+                .data   = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
+                .size   = 10,
+        },
+        /* Read final cache page. */
+        {
+                .offset = TEST_FILE_SIZE - 10,
+                .data   = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
+                .size   = 10,
+        },
+        /* Read final cache page. */
+        {
+                .offset = TEST_FILE_SIZE - 3,
+                .data   = { 7, 8, 9, 0, 0, 0, 0, 0, 0, 0 },
+                .size   = 3,
+        },
+};
+
+int dso__test_data(void)
+{
+        struct machine machine;
+        struct dso *dso;
+        char *file = test_file(TEST_FILE_SIZE);
+        size_t i;
+
+        TEST_ASSERT_VAL("No test file", file);
+
+        memset(&machine, 0, sizeof(machine));
+
+        dso = dso__new((const char *)file);
+
+        /* Basic 10 bytes tests. */
+        for (i = 0; i < ARRAY_SIZE(offsets); i++) {
+                struct test_data_offset *data = &offsets[i];
+                ssize_t size;
+                u8 buf[10];
+
+                memset(buf, 0, 10);
+                size = dso__data_read_offset(dso, &machine, data->offset,
+                                     buf, 10);
+
+                TEST_ASSERT_VAL("Wrong size", size == data->size);
+                TEST_ASSERT_VAL("Wrong data", !memcmp(buf, data->data, 10));
+        }
+
+        /* Read cross multiple cache pages. */
+        {
+                ssize_t size;
+                int c;
+                u8 *buf;
+
+                buf = malloc(TEST_FILE_SIZE);
+                TEST_ASSERT_VAL("ENOMEM\n", buf);
+
+                /* First iteration to fill caches, second one to read them. */
+                for (c = 0; c < 2; c++) {
+                        memset(buf, 0, TEST_FILE_SIZE);
+                        size = dso__data_read_offset(dso, &machine, 10,
+                                                     buf, TEST_FILE_SIZE);
+
+                        TEST_ASSERT_VAL("Wrong size",
+                                size == (TEST_FILE_SIZE - 10));
+
+                        for (i = 0; i < (size_t)size; i++)
+                                TEST_ASSERT_VAL("Wrong data",
+                                        buf[i] == (i % 10));
+                }
+
+                free(buf);
+        }
+
+        dso__delete(dso);
+        unlink(file);
+        return 0;
+}
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 980d5f57373b..1fe733a1e21f 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -325,4 +325,5 @@ ssize_t dso__data_read_offset(struct dso *dso, struct machine *machine,
 ssize_t dso__data_read_addr(struct dso *dso, struct map *map,
                             struct machine *machine, u64 addr,
                             u8 *data, ssize_t size);
+int dso__test_data(void);
 #endif /* __PERF_SYMBOL */