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selftests/powerpc/pmu: Add interface test for mmcra_ifm field of indirect call type

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The testcase uses "instructions" event to check if the
Instruction filtering mode(IFM) bits are programmed correctly
for indirect branch type. Testcase checks if IFM bits are
programmed correctly to Monitor Mode Control Register A (MMCRA)
via perf interface for ISA v3.1 platform.

Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220610134113.62991-6-atrajeev@linux.vnet.ibm.com
This commit is contained in:
Kajol Jain 2022-06-10 19:10:43 +05:30 committed by Michael Ellerman
parent 61d8990031
commit c55dabc6d5
3 changed files with 100 additions and 2 deletions
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28
tools/testing/selftests/powerpc/pmu/branch_loops.S Normal file
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@ -0,0 +1,28 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright 2022, Kajol Jain, IBM Corp.
*/
#include <ppc-asm.h>
.text
#define ITER_SHIFT 31
FUNC_START(indirect_branch_loop)
li r3, 1
sldi r3, r3, ITER_SHIFT
1: cmpdi r3, 0
beqlr
addi r3, r3, -1
ld r4, 2f@got(%r2)
mtctr r4
bctr
.balign 32
2: b 1b
FUNC_END(indirect_branch_loop)

5
tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile
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@ -4,9 +4,10 @@ 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 mmcra_thresh_marked_sample_test mmcra_thresh_cmp_test
mmcr3_src_test mmcra_thresh_marked_sample_test mmcra_thresh_cmp_test \
mmcra_bhrb_ind_call_test
top_srcdir = ../../../../../..
include ../../../lib.mk
$(TEST_GEN_PROGS): ../../harness.c ../../utils.c ../event.c ../lib.c misc.c misc.h ../loop.S
$(TEST_GEN_PROGS): ../../harness.c ../../utils.c ../event.c ../lib.c misc.c misc.h ../loop.S ../branch_loops.S

69
tools/testing/selftests/powerpc/pmu/sampling_tests/mmcra_bhrb_ind_call_test.c Normal file
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// 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 indirect_branch_loop(void);
/* Instructions */
#define EventCode 0x500fa
/* ifm field for indirect branch mode */
#define IFM_IND_BRANCH 0x2
/*
* A perf sampling test for mmcra
* field: ifm for bhrb ind_call.
*/
static int mmcra_bhrb_ind_call_test(void)
{
struct event event;
u64 *intr_regs;
/*
* Check for platform support for the test.
* This test is only aplicable on power10
*/
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;
event.attr.sample_type |= PERF_SAMPLE_BRANCH_STACK;
event.attr.branch_sample_type = PERF_SAMPLE_BRANCH_IND_CALL;
event.attr.exclude_kernel = 1;
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 */
indirect_branch_loop();
FAIL_IF(event_disable(&event));
intr_regs = get_intr_regs(&event, event.mmap_buffer);
/* Check for intr_regs */
FAIL_IF(!intr_regs);
/* Verify that ifm bit is set properly in MMCRA */
FAIL_IF(get_mmcra_ifm(get_reg_value(intr_regs, "MMCRA"), 5) != IFM_IND_BRANCH);
event_close(&event);
return 0;
}
int main(void)
{
return test_harness(mmcra_bhrb_ind_call_test, "mmcra_bhrb_ind_call_test");
}