Commit 29cf373c authored by Kajol Jain's avatar Kajol Jain Committed by Michael Ellerman
Browse files

selftests/powerpc/pmu: Add interface test for mmcra register fields 



The testcase uses event code 0x35340401e0 to verify the settings for
different fields in Monitor Mode Control Register A (MMCRA). The fields
include thresh_start, thresh_stop thresh_select, sdar mode, sample and
marked bit. Checks if these fields are translated correctly via perf
interface to MMCRA.

Signed-off-by: default avatarKajol Jain <kjain@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/20220127072012.662451-21-kjain@linux.ibm.com
parent 02f02feb

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

+1 −0
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@@ -8,3 +8,4 @@ mmcr1_comb_test 
mmcr2_l2l3_test

mmcr2_fcs_fch_test

mmcr3_src_test

mmcra_thresh_marked_sample_test

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

+1 −1
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@@ -4,7 +4,7 @@ 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 mmcr2_l2l3_test mmcr2_fcs_fch_test \

		   mmcr3_src_test

		   mmcr3_src_test mmcra_thresh_marked_sample_test



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

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

tools/testing/selftests/powerpc/pmu/sampling_tests/mmcra_thresh_marked_sample_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 "misc.h"

#include "utils.h"



/*

 * Primary PMU event used here is PM_MRK_INST_CMPL (0x401e0)

 * Threshold event selection used is issue to complete for cycles

 * Sampling criteria is Load only sampling

 */

#define EventCode 0x35340401e0



extern void thirty_two_instruction_loop_with_ll_sc(u64 loops, u64 *ll_sc_target);



/* A perf sampling test to test mmcra fields */

static int mmcra_thresh_marked_sample(void)

{

	struct event event;

	u64 *intr_regs;

	u64 dummy;



	/* Check for platform support for the test */

	SKIP_IF(check_pvr_for_sampling_tests());



	/* 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 */

	thirty_two_instruction_loop_with_ll_sc(1000000, &dummy);



	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 thresh sel/start/stop, marked, random sample

	 * eligibility, sdar mode and sample mode fields match with

	 * the corresponding event code fields

	 */

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

			get_mmcra_thd_sel(get_reg_value(intr_regs, "MMCRA"), 4));

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

			get_mmcra_thd_start(get_reg_value(intr_regs, "MMCRA"), 4));

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

			get_mmcra_thd_stop(get_reg_value(intr_regs, "MMCRA"), 4));

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

			get_mmcra_marked(get_reg_value(intr_regs, "MMCRA"), 4));

	FAIL_IF(EV_CODE_EXTRACT(event.attr.config, sample >> 2) !=

			get_mmcra_rand_samp_elig(get_reg_value(intr_regs, "MMCRA"), 4));

	FAIL_IF(EV_CODE_EXTRACT(event.attr.config, sample & 0x3) !=

			get_mmcra_sample_mode(get_reg_value(intr_regs, "MMCRA"), 4));

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

			get_mmcra_sm(get_reg_value(intr_regs, "MMCRA"), 4));



	event_close(&event);

	return 0;

}



int main(void)

{

	return test_harness(mmcra_thresh_marked_sample, "mmcra_thresh_marked_sample");

}