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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
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02f02feb6b
commit
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3 changed files with 82 additions and 1 deletions
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@ -8,3 +8,4 @@ mmcr1_comb_test
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mmcr2_l2l3_test
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mmcr2_fcs_fch_test
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mmcr3_src_test
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mmcra_thresh_marked_sample_test
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@ -4,7 +4,7 @@ CFLAGS += -m64
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TEST_GEN_PROGS := mmcr0_exceptionbits_test mmcr0_cc56run_test mmcr0_pmccext_test \
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mmcr0_pmcjce_test mmcr0_fc56_pmc1ce_test mmcr0_fc56_pmc56_test \
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mmcr1_comb_test mmcr2_l2l3_test mmcr2_fcs_fch_test \
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mmcr3_src_test
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mmcr3_src_test mmcra_thresh_marked_sample_test
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top_srcdir = ../../../../../..
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include ../../../lib.mk
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@ -0,0 +1,80 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2022, Kajol Jain, IBM Corp.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "../event.h"
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#include "misc.h"
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#include "utils.h"
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/*
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* Primary PMU event used here is PM_MRK_INST_CMPL (0x401e0)
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* Threshold event selection used is issue to complete for cycles
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* Sampling criteria is Load only sampling
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*/
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#define EventCode 0x35340401e0
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extern void thirty_two_instruction_loop_with_ll_sc(u64 loops, u64 *ll_sc_target);
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/* A perf sampling test to test mmcra fields */
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static int mmcra_thresh_marked_sample(void)
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{
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struct event event;
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u64 *intr_regs;
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u64 dummy;
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/* Check for platform support for the test */
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SKIP_IF(check_pvr_for_sampling_tests());
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/* Init the event for the sampling test */
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event_init_sampling(&event, EventCode);
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event.attr.sample_regs_intr = platform_extended_mask;
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FAIL_IF(event_open(&event));
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event.mmap_buffer = event_sample_buf_mmap(event.fd, 1);
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FAIL_IF(event_enable(&event));
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/* workload to make the event overflow */
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thirty_two_instruction_loop_with_ll_sc(1000000, &dummy);
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FAIL_IF(event_disable(&event));
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/* Check for sample count */
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FAIL_IF(!collect_samples(event.mmap_buffer));
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intr_regs = get_intr_regs(&event, event.mmap_buffer);
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/* Check for intr_regs */
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FAIL_IF(!intr_regs);
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/*
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* Verify that thresh sel/start/stop, marked, random sample
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* eligibility, sdar mode and sample mode fields match with
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* the corresponding event code fields
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*/
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FAIL_IF(EV_CODE_EXTRACT(event.attr.config, thd_sel) !=
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get_mmcra_thd_sel(get_reg_value(intr_regs, "MMCRA"), 4));
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FAIL_IF(EV_CODE_EXTRACT(event.attr.config, thd_start) !=
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get_mmcra_thd_start(get_reg_value(intr_regs, "MMCRA"), 4));
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FAIL_IF(EV_CODE_EXTRACT(event.attr.config, thd_stop) !=
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get_mmcra_thd_stop(get_reg_value(intr_regs, "MMCRA"), 4));
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FAIL_IF(EV_CODE_EXTRACT(event.attr.config, marked) !=
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get_mmcra_marked(get_reg_value(intr_regs, "MMCRA"), 4));
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FAIL_IF(EV_CODE_EXTRACT(event.attr.config, sample >> 2) !=
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get_mmcra_rand_samp_elig(get_reg_value(intr_regs, "MMCRA"), 4));
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FAIL_IF(EV_CODE_EXTRACT(event.attr.config, sample & 0x3) !=
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get_mmcra_sample_mode(get_reg_value(intr_regs, "MMCRA"), 4));
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FAIL_IF(EV_CODE_EXTRACT(event.attr.config, sm) !=
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get_mmcra_sm(get_reg_value(intr_regs, "MMCRA"), 4));
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event_close(&event);
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return 0;
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}
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int main(void)
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{
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return test_harness(mmcra_thresh_marked_sample, "mmcra_thresh_marked_sample");
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}
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