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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: 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/20220127072012.662451-21-kjain@linux.ibm.com
This commit is contained in:
Kajol Jain 2022-01-27 12:50:12 +05:30 committed by Michael Ellerman
parent 02f02feb6b
commit 29cf373c57
3 changed files with 82 additions and 1 deletions
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1
tools/testing/selftests/powerpc/pmu/sampling_tests/.gitignore vendored
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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

2
tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile
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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

80
tools/testing/selftests/powerpc/pmu/sampling_tests/mmcra_thresh_marked_sample_test.c Normal file
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@ -0,0 +1,80 @@
// 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");
}