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selftests/powerpc/pmu/: Add interface test for mmcr3_src fields 

The testcase uses event code 0x1340000001c040 to verify the settings for
different src fields in Monitor Mode Control Register 3 (MMCR3). Checks
if these fields are translated correctly via perf interface to MMCR3 on
ISA v3.1 platform.

Signed-off-by: Kajol Jain <kjain@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/20220127072012.662451-20-kjain@linux.ibm.com
This commit is contained in:
Kajol Jain 2022-01-27 12:50:11 +05:30 committed by Michael Ellerman
parent 9ee241f1b1
commit 02f02feb6b
3 changed files with 70 additions and 1 deletions
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1
tools/testing/selftests/powerpc/pmu/sampling_tests/.gitignore vendored
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@ -7,3 +7,4 @@ mmcr0_fc56_pmc56_test
mmcr1_comb_test
mmcr2_l2l3_test
mmcr2_fcs_fch_test
mmcr3_src_test

3
tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile
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@ -3,7 +3,8 @@ 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
mmcr1_comb_test mmcr2_l2l3_test mmcr2_fcs_fch_test \
mmcr3_src_test
top_srcdir = ../../../../../..
include ../../../lib.mk

67
tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr3_src_test.c Normal file
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@ -0,0 +1,67 @@
// 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"
extern void thirty_two_instruction_loop_with_ll_sc(u64 loops, u64 *ll_sc_target);
/* The data cache was reloaded from local core's L3 due to a demand load */
#define EventCode 0x1340000001c040
/*
* A perf sampling test for mmcr3
* fields.
*/
static int mmcr3_src(void)
{
struct event event;
u64 *intr_regs;
u64 dummy;
/* 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 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 src field of MMCR3 match with
* corresponding event code field
*/
FAIL_IF(EV_CODE_EXTRACT(event.attr.config, mmcr3_src) !=
get_mmcr3_src(get_reg_value(intr_regs, "MMCR3"), 1));
event_close(&event);
return 0;
}
int main(void)
{
return test_harness(mmcr3_src, "mmcr3_src");
}