Commit 9bd70218 authored by Ian Rogers's avatar Ian Rogers Committed by Arnaldo Carvalho de Melo
Browse files

perf test: Add user space counter reading tests 



These tests are based on test_stat_user_read in
tools/lib/perf/tests/test-evsel.c.

The tests are modified to skip if perf_event_open fails or rdpmc isn't
supported.

Committer testing:

  ⬢[acme@toolbox perf]$ perf test "mmap interface"
    4: mmap interface tests                         :
    4.1: Read samples using the mmap interface      : Skip (permissions)
  ⬢[acme@toolbox perf]$

  [root@five ~]# perf test "mmap interface"
    4: mmap interface tests                         :
    4.1: Read samples using the mmap interface      : Ok
  [root@five ~]#

Signed-off-by: default avatarIan Rogers <irogers@google.com>
Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20220719223946.176299-4-irogers@google.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 481fadfb

tools/perf/tests/mmap-basic.c

+126 −1
Original line number Diff line number Diff line
@@ -170,14 +170,139 @@ static int test__basic_mmap(struct test_suite *test __maybe_unused, int subtest 
	return err;

}



static int test_stat_user_read(int event)

{

	struct perf_counts_values counts = { .val = 0 };

	struct perf_thread_map *threads;

	struct perf_evsel *evsel;

	struct perf_event_mmap_page *pc;

	struct perf_event_attr attr = {

		.type	= PERF_TYPE_HARDWARE,

		.config	= event,

#ifdef __aarch64__

		.config1 = 0x2,		/* Request user access */

#endif

	};

	int err, i, ret = TEST_FAIL;

	bool opened = false, mapped = false;



	threads = perf_thread_map__new_dummy();

	TEST_ASSERT_VAL("failed to create threads", threads);



	perf_thread_map__set_pid(threads, 0, 0);



	evsel = perf_evsel__new(&attr);

	TEST_ASSERT_VAL("failed to create evsel", evsel);



	err = perf_evsel__open(evsel, NULL, threads);

	if (err) {

		pr_err("failed to open evsel: %s\n", strerror(-err));

		ret = TEST_SKIP;

		goto out;

	}

	opened = true;



	err = perf_evsel__mmap(evsel, 0);

	if (err) {

		pr_err("failed to mmap evsel: %s\n", strerror(-err));

		goto out;

	}

	mapped = true;



	pc = perf_evsel__mmap_base(evsel, 0, 0);

	if (!pc) {

		pr_err("failed to get mmapped address\n");

		goto out;

	}



	if (!pc->cap_user_rdpmc || !pc->index) {

		pr_err("userspace counter access not %s\n",

			!pc->cap_user_rdpmc ? "supported" : "enabled");

		ret = TEST_SKIP;

		goto out;

	}

	if (pc->pmc_width < 32) {

		pr_err("userspace counter width not set (%d)\n", pc->pmc_width);

		goto out;

	}



	perf_evsel__read(evsel, 0, 0, &counts);

	if (counts.val == 0) {

		pr_err("failed to read value for evsel\n");

		goto out;

	}



	for (i = 0; i < 5; i++) {

		volatile int count = 0x10000 << i;

		__u64 start, end, last = 0;



		pr_debug("\tloop = %u, ", count);



		perf_evsel__read(evsel, 0, 0, &counts);

		start = counts.val;



		while (count--) ;



		perf_evsel__read(evsel, 0, 0, &counts);

		end = counts.val;



		if ((end - start) < last) {

			pr_err("invalid counter data: end=%llu start=%llu last= %llu\n",

				end, start, last);

			goto out;

		}

		last = end - start;

		pr_debug("count = %llu\n", end - start);

	}

	ret = TEST_OK;



out:

	if (mapped)

		perf_evsel__munmap(evsel);

	if (opened)

		perf_evsel__close(evsel);

	perf_evsel__delete(evsel);



	perf_thread_map__put(threads);

	return ret;

}



static int test__mmap_user_read_instr(struct test_suite *test __maybe_unused,

				      int subtest __maybe_unused)

{

	return test_stat_user_read(PERF_COUNT_HW_INSTRUCTIONS);

}



static int test__mmap_user_read_cycles(struct test_suite *test __maybe_unused,

				       int subtest __maybe_unused)

{

	return test_stat_user_read(PERF_COUNT_HW_CPU_CYCLES);

}



static struct test_case tests__basic_mmap[] = {

	TEST_CASE_REASON("Read samples using the mmap interface",

			 basic_mmap,

			 "permissions"),

	TEST_CASE_REASON("User space counter reading of instructions",

			 mmap_user_read_instr,

#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__)

			 "permissions"

#else

			 "unsupported"

#endif

		),

	TEST_CASE_REASON("User space counter reading of cycles",

			 mmap_user_read_cycles,

#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__)

			 "permissions"

#else

			 "unsupported"

#endif

		),

	{	.name = NULL, }

};



struct test_suite suite__basic_mmap = {

	.desc = "Read samples using the mmap interface",

	.desc = "mmap interface tests",

	.test_cases = tests__basic_mmap,

};