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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: Madhavan Srinivasan <maddy@linux.ibm.com>
[mpe: Add error checking, drop GET_MMCR_FIELD, add to .gitignore]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220127072012.662451-18-kjain@linux.ibm.com
This commit is contained in:
Madhavan Srinivasan 2022-01-27 12:50:09 +05:30 committed by Michael Ellerman
parent 2becea3b6a
commit ac575b2606
3 changed files with 76 additions and 1 deletions
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1
tools/testing/selftests/powerpc/pmu/sampling_tests/.gitignore vendored
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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

2
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

74
tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr2_l2l3_test.c Normal file
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@ -0,0 +1,74 @@
// 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");
}