Commit ab8bca92 authored by Kajol Jain's avatar Kajol Jain Committed by Michael Ellerman
Browse files

selftests/powerpc/pmu: Add test for hardware cache events 



The testcase checks if the transalation of a generic hardware cache
event is done properly via perf interface. The hardware cache events has
type as PERF_TYPE_HW_CACHE and each event points to raw event code id.

Testcase checks different combination of cache level, cache event
operation type and cache event result type and verify for a given event
code, whether transalation matches with the current cache event mappings
via perf interface.

Signed-off-by: default avatarKajol Jain <kjain@linux.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220610134113.62991-36-atrajeev@linux.vnet.ibm.com
parent 9ac92fec

tools/testing/selftests/powerpc/pmu/event_code_tests/Makefile

+2 −1
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@@ -6,7 +6,8 @@ TEST_GEN_PROGS := group_constraint_pmc56_test group_pmc56_exclude_constraints_te 
	group_constraint_mmcra_sample_test invalid_event_code_test reserved_bits_mmcra_thresh_ctl_test \

	blacklisted_events_test event_alternatives_tests_p9 event_alternatives_tests_p10 generic_events_valid_test \

	group_constraint_l2l3_sel_test group_constraint_cache_test group_constraint_thresh_cmp_test \

	group_constraint_unit_test group_constraint_thresh_ctl_test group_constraint_thresh_sel_test

	group_constraint_unit_test group_constraint_thresh_ctl_test group_constraint_thresh_sel_test \

	hw_cache_event_type_test



top_srcdir = ../../../../../..

include ../../../lib.mk

tools/testing/selftests/powerpc/pmu/event_code_tests/hw_cache_event_type_test.c

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// SPDX-License-Identifier: GPL-2.0-only

/*

 * Copyright 2022, Kajol Jain, IBM Corp.

 */



#include <stdio.h>

#include <stdlib.h>



#include "../event.h"

#include "utils.h"

#include "../sampling_tests/misc.h"



/*

 * Load Missed L1, for power9 its pointing to PM_LD_MISS_L1_FIN (0x2c04e) and

 * for power10 its pointing to PM_LD_MISS_L1 (0x3e054)

 *

 * Hardware cache level : PERF_COUNT_HW_CACHE_L1D

 * Hardware cache event operation type : PERF_COUNT_HW_CACHE_OP_READ

 * Hardware cache event result type : PERF_COUNT_HW_CACHE_RESULT_MISS

 */

#define EventCode_1 0x10000

/*

 * Hardware cache level : PERF_COUNT_HW_CACHE_L1D

 * Hardware cache event operation type : PERF_COUNT_HW_CACHE_OP_WRITE

 * Hardware cache event result type : PERF_COUNT_HW_CACHE_RESULT_ACCESS

 */

#define EventCode_2 0x0100

/*

 * Hardware cache level : PERF_COUNT_HW_CACHE_DTLB

 * Hardware cache event operation type : PERF_COUNT_HW_CACHE_OP_WRITE

 * Hardware cache event result type : PERF_COUNT_HW_CACHE_RESULT_ACCESS

 */

#define EventCode_3 0x0103

/*

 * Hardware cache level : PERF_COUNT_HW_CACHE_L1D

 * Hardware cache event operation type : PERF_COUNT_HW_CACHE_OP_READ

 * Hardware cache event result type : Invalid ( > PERF_COUNT_HW_CACHE_RESULT_MAX)

 */

#define EventCode_4 0x030000



/*

 * A perf test to check valid hardware cache events.

 */

static int hw_cache_event_type_test(void)

{

	struct event event;



	/* Check for platform support for the test */

	SKIP_IF(platform_check_for_tests());



	/* Skip for Generic compat PMU */

	SKIP_IF(check_for_generic_compat_pmu());



	/* Init the event to test hardware cache event */

	event_init_opts(&event, EventCode_1, PERF_TYPE_HW_CACHE, "event");



	/* Expected to success as its pointing to L1 load miss */

	FAIL_IF(event_open(&event));

	event_close(&event);



	/* Init the event to test hardware cache event */

	event_init_opts(&event, EventCode_2, PERF_TYPE_HW_CACHE, "event");



	/* Expected to fail as the corresponding cache event entry have 0 in that index */

	FAIL_IF(!event_open(&event));

	event_close(&event);



	/* Init the event to test hardware cache event */

	event_init_opts(&event, EventCode_3, PERF_TYPE_HW_CACHE, "event");



	/* Expected to fail as the corresponding cache event entry have -1 in that index */

	FAIL_IF(!event_open(&event));

	event_close(&event);



	/* Init the event to test hardware cache event */

	event_init_opts(&event, EventCode_4, PERF_TYPE_HW_CACHE, "event");



	/* Expected to fail as hardware cache event result type is Invalid */

	FAIL_IF(!event_open(&event));

	event_close(&event);



	return 0;

}



int main(void)

{

	return test_harness(hw_cache_event_type_test, "hw_cache_event_type_test");

}