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| author | Athira Rajeev <atrajeev@linux.vnet.ibm.com> | 2022-01-27 12:50:04 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2022-03-01 23:39:41 +1100 |
| commit | 9ac7c6d5e4b570f416d849b263a6f67a617b4fa5 (patch) | |
| tree | 7666a264878a07e5769dcbd252efc5c90c6074ab /tools | |
| parent | b24142b9d2401468bcd8df157013306d5b4f6626 (diff) | |
| download | linux-9ac7c6d5e4b570f416d849b263a6f67a617b4fa5.tar.gz | |
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
Diffstat (limited to 'tools')
3 files changed, 61 insertions, 1 deletions
diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/.gitignore b/tools/testing/selftests/powerpc/pmu/sampling_tests/.gitignore index 991ed33eda20..0bc68fed074d 100644 --- a/tools/testing/selftests/powerpc/pmu/sampling_tests/.gitignore +++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/.gitignore @@ -1,3 +1,4 @@ mmcr0_exceptionbits_test mmcr0_cc56run_test mmcr0_pmccext_test +mmcr0_pmcjce_test diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile b/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile index 7feaf5d387c2..28029c0f1399 100644 --- a/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile +++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile @@ -1,7 +1,8 @@ # SPDX-License-Identifier: GPL-2.0 CFLAGS += -m64 -TEST_GEN_PROGS := mmcr0_exceptionbits_test mmcr0_cc56run_test mmcr0_pmccext_test +TEST_GEN_PROGS := mmcr0_exceptionbits_test mmcr0_cc56run_test mmcr0_pmccext_test \ + mmcr0_pmcjce_test top_srcdir = ../../../../../.. include ../../../lib.mk diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr0_pmcjce_test.c b/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr0_pmcjce_test.c new file mode 100644 index 000000000000..fdd8ed9bf725 --- /dev/null +++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr0_pmcjce_test.c @@ -0,0 +1,58 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2022, Athira Rajeev, IBM Corp. + */ + +#include <stdio.h> +#include <stdlib.h> + +#include "../event.h" +#include "misc.h" +#include "utils.h" + +extern void thirty_two_instruction_loop(int loops); + +/* + * A perf sampling test for mmcr0 + * field: pmcjce + */ +static int mmcr0_pmcjce(void) +{ + struct event event; + u64 *intr_regs; + + /* 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, 0x500fa); + 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(10000); + + 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 pmcjce field is set in MMCR0 */ + FAIL_IF(!get_mmcr0_pmcjce(get_reg_value(intr_regs, "MMCR0"), 5)); + + event_close(&event); + return 0; +} + +int main(void) +{ + return test_harness(mmcr0_pmcjce, "mmcr0_pmcjce"); +} |