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selftests/powerpc/pmu/: Add interface test for mmcr0_pmcjce field
The testcase uses event code 0x500fa ("instructions") to verify the PMCjCE bit setting in Monitor Mode Control Register 0 (MMCR0). This bit is expected to be set in MMCR0 when using Performance Monitor Counter 5 (PMC5). Checks if perf interface sets this bit correctly. Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.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/20220127072012.662451-13-kjain@linux.ibm.com
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3 changed files with 61 additions and 1 deletions
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mmcr0_exceptionbits_test
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mmcr0_cc56run_test
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mmcr0_pmccext_test
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mmcr0_pmcjce_test
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# SPDX-License-Identifier: GPL-2.0
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CFLAGS += -m64
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TEST_GEN_PROGS := mmcr0_exceptionbits_test mmcr0_cc56run_test mmcr0_pmccext_test
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TEST_GEN_PROGS := mmcr0_exceptionbits_test mmcr0_cc56run_test mmcr0_pmccext_test \
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mmcr0_pmcjce_test
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top_srcdir = ../../../../../..
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include ../../../lib.mk
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2022, Athira Rajeev, 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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extern void thirty_two_instruction_loop(int loops);
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/*
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* A perf sampling test for mmcr0
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* field: pmcjce
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*/
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static int mmcr0_pmcjce(void)
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{
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struct event event;
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u64 *intr_regs;
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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, 0x500fa);
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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(10000);
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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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/* Verify that pmcjce field is set in MMCR0 */
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FAIL_IF(!get_mmcr0_pmcjce(get_reg_value(intr_regs, "MMCR0"), 5));
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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(mmcr0_pmcjce, "mmcr0_pmcjce");
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}
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