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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
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3 changed files with 76 additions and 1 deletions
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@ -5,3 +5,4 @@ mmcr0_pmcjce_test
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mmcr0_fc56_pmc1ce_test
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mmcr0_fc56_pmc56_test
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mmcr1_comb_test
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mmcr2_l2l3_test
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@ -3,7 +3,7 @@ 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
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mmcr1_comb_test mmcr2_l2l3_test
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top_srcdir = ../../../../../..
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include ../../../lib.mk
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@ -0,0 +1,74 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2022, Madhavan Srinivasan, 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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/* All successful D-side store dispatches for this thread */
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#define EventCode 0x010000046080
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#define MALLOC_SIZE (0x10000 * 10) /* Ought to be enough .. */
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/*
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* A perf sampling test for mmcr2
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* fields : l2l3
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*/
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static int mmcr2_l2l3(void)
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{
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struct event event;
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u64 *intr_regs;
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char *p;
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int i;
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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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SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_3_1));
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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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p = malloc(MALLOC_SIZE);
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FAIL_IF(!p);
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for (i = 0; i < MALLOC_SIZE; i += 0x10000)
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p[i] = i;
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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 l2l3 field of MMCR2 match with
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* corresponding event code field
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*/
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FAIL_IF(EV_CODE_EXTRACT(event.attr.config, l2l3) !=
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get_mmcr2_l2l3(get_reg_value(intr_regs, "MMCR2"), 4));
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event_close(&event);
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free(p);
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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(mmcr2_l2l3, "mmcr2_l2l3");
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}
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