Commit ac575b26 authored by Madhavan Srinivasan's avatar Madhavan Srinivasan Committed by Michael Ellerman
Browse files

selftests/powerpc/pmu/: Add interface test for mmcr2_l2l3 field 



The testcases uses event code 0x010000046080 to verify the l2l3 bit
setting for Monitor Mode Control Register 2 (MMCR2). check if this bit
is set correctly via perf interface in ISA v3.1 platform.

Signed-off-by: default avatarMadhavan Srinivasan <maddy@linux.ibm.com>
[mpe: Add error checking, drop GET_MMCR_FIELD, add to .gitignore]
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220127072012.662451-18-kjain@linux.ibm.com
parent 2becea3b

tools/testing/selftests/powerpc/pmu/sampling_tests/.gitignore

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@@ -5,3 +5,4 @@ mmcr0_pmcjce_test 
mmcr0_fc56_pmc1ce_test

mmcr0_fc56_pmc56_test

mmcr1_comb_test

mmcr2_l2l3_test

tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile

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@@ -3,7 +3,7 @@ CFLAGS += -m64 


TEST_GEN_PROGS := mmcr0_exceptionbits_test mmcr0_cc56run_test mmcr0_pmccext_test \

		   mmcr0_pmcjce_test mmcr0_fc56_pmc1ce_test mmcr0_fc56_pmc56_test \

		   mmcr1_comb_test

		   mmcr1_comb_test mmcr2_l2l3_test



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

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

tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr2_l2l3_test.c

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

/*

 * Copyright 2022, Madhavan Srinivasan, IBM Corp.

 */



#include <stdio.h>

#include <stdlib.h>



#include "../event.h"

#include "misc.h"

#include "utils.h"



/* All successful D-side store dispatches for this thread */

#define EventCode 0x010000046080



#define MALLOC_SIZE     (0x10000 * 10)  /* Ought to be enough .. */



/*

 * A perf sampling test for mmcr2

 * fields : l2l3

 */

static int mmcr2_l2l3(void)

{

	struct event event;

	u64 *intr_regs;

	char *p;

	int i;



	/* Check for platform support for the test */

	SKIP_IF(check_pvr_for_sampling_tests());

	SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_3_1));



	/* Init the event for the sampling test */

	event_init_sampling(&event, EventCode);

	event.attr.sample_regs_intr = platform_extended_mask;

	FAIL_IF(event_open(&event));

	event.mmap_buffer = event_sample_buf_mmap(event.fd, 1);



	FAIL_IF(event_enable(&event));



	/* workload to make the event overflow */

	p = malloc(MALLOC_SIZE);

	FAIL_IF(!p);



	for (i = 0; i < MALLOC_SIZE; i += 0x10000)

		p[i] = i;



	FAIL_IF(event_disable(&event));



	/* Check for sample count */

	FAIL_IF(!collect_samples(event.mmap_buffer));



	intr_regs = get_intr_regs(&event, event.mmap_buffer);



	/* Check for intr_regs */

	FAIL_IF(!intr_regs);



	/*

	 * Verify that l2l3 field of MMCR2 match with

	 * corresponding event code field

	 */

	FAIL_IF(EV_CODE_EXTRACT(event.attr.config, l2l3) !=

		get_mmcr2_l2l3(get_reg_value(intr_regs, "MMCR2"), 4));



	event_close(&event);

	free(p);



	return 0;

}



int main(void)

{

	return test_harness(mmcr2_l2l3, "mmcr2_l2l3");

}