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perf test: Add selftest to test IBS invocation via core pmu events

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IBS pmu can be invoked via fixed set of core pmu events with 'precise_ip'
set to 1. Add a simple event open test for all these events.

Without kernel fix:
  $ sudo ./perf test -vv 76
   76: AMD IBS via core pmu                                      :
  --- start ---
  test child forked, pid 6553
  Using CPUID AuthenticAMD-25-1-1
  type: 0x0, config: 0x0, fd: 3  -  Pass
  type: 0x0, config: 0x1, fd: -1  -  Pass
  type: 0x4, config: 0x76, fd: -1  -  Fail
  type: 0x4, config: 0xc1, fd: -1  -  Fail
  type: 0x4, config: 0x12, fd: -1  -  Pass
  test child finished with -1
  ---- end ----
  AMD IBS via core pmu: FAILED!

With kernel fix:
  $ sudo ./perf test -vv 76
   76: AMD IBS via core pmu                                      :
  --- start ---
  test child forked, pid 7526
  Using CPUID AuthenticAMD-25-1-1
  type: 0x0, config: 0x0, fd: 3  -  Pass
  type: 0x0, config: 0x1, fd: -1  -  Pass
  type: 0x4, config: 0x76, fd: 3  -  Pass
  type: 0x4, config: 0xc1, fd: 3  -  Pass
  type: 0x4, config: 0x12, fd: -1  -  Pass
  test child finished with 0
  ---- end ----
  AMD IBS via core pmu: Ok

Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20230504110003.2548-5-ravi.bangoria@amd.com
This commit is contained in:
Ravi Bangoria 2023-05-04 16:30:03 +05:30 committed by Peter Zijlstra
parent 9551fbb64d
commit 78075d9475
4 changed files with 75 additions and 0 deletions
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1
tools/perf/arch/x86/include/arch-tests.h
View file

@ -11,6 +11,7 @@ int test__intel_pt_pkt_decoder(struct test_suite *test, int subtest);
int test__intel_pt_hybrid_compat(struct test_suite *test, int subtest);
int test__bp_modify(struct test_suite *test, int subtest);
int test__x86_sample_parsing(struct test_suite *test, int subtest);
int test__amd_ibs_via_core_pmu(struct test_suite *test, int subtest);
extern struct test_suite *arch_tests[];

1
tools/perf/arch/x86/tests/Build
View file

@ -5,3 +5,4 @@ perf-y += arch-tests.o
perf-y += sample-parsing.o
perf-$(CONFIG_AUXTRACE) += insn-x86.o intel-pt-test.o
perf-$(CONFIG_X86_64) += bp-modify.o
perf-y += amd-ibs-via-core-pmu.o

71
tools/perf/arch/x86/tests/amd-ibs-via-core-pmu.c Normal file
View file

@ -0,0 +1,71 @@
// SPDX-License-Identifier: GPL-2.0
#include "arch-tests.h"
#include "linux/perf_event.h"
#include "tests/tests.h"
#include "pmu.h"
#include "pmus.h"
#include "../perf-sys.h"
#include "debug.h"
#define NR_SUB_TESTS 5
static struct sub_tests {
int type;
unsigned long config;
bool valid;
} sub_tests[NR_SUB_TESTS] = {
{ PERF_TYPE_HARDWARE, PERF_COUNT_HW_CPU_CYCLES, true },
{ PERF_TYPE_HARDWARE, PERF_COUNT_HW_INSTRUCTIONS, false },
{ PERF_TYPE_RAW, 0x076, true },
{ PERF_TYPE_RAW, 0x0C1, true },
{ PERF_TYPE_RAW, 0x012, false },
};
static int event_open(int type, unsigned long config)
{
struct perf_event_attr attr;
memset(&attr, 0, sizeof(struct perf_event_attr));
attr.type = type;
attr.size = sizeof(struct perf_event_attr);
attr.config = config;
attr.disabled = 1;
attr.precise_ip = 1;
attr.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
attr.sample_period = 100000;
return sys_perf_event_open(&attr, -1, 0, -1, 0);
}
int test__amd_ibs_via_core_pmu(struct test_suite *test __maybe_unused,
int subtest __maybe_unused)
{
struct perf_pmu *ibs_pmu;
int ret = TEST_OK;
int fd, i;
if (list_empty(&pmus))
perf_pmu__scan(NULL);
ibs_pmu = perf_pmu__find("ibs_op");
if (!ibs_pmu)
return TEST_SKIP;
for (i = 0; i < NR_SUB_TESTS; i++) {
fd = event_open(sub_tests[i].type, sub_tests[i].config);
pr_debug("type: 0x%x, config: 0x%lx, fd: %d - ", sub_tests[i].type,
sub_tests[i].config, fd);
if ((sub_tests[i].valid && fd == -1) ||
(!sub_tests[i].valid && fd > 0)) {
pr_debug("Fail\n");
ret = TEST_FAIL;
} else {
pr_debug("Pass\n");
}
if (fd > 0)
close(fd);
}
return ret;
}

2
tools/perf/arch/x86/tests/arch-tests.c
View file

@ -22,6 +22,7 @@ struct test_suite suite__intel_pt = {
DEFINE_SUITE("x86 bp modify", bp_modify);
#endif
DEFINE_SUITE("x86 Sample parsing", x86_sample_parsing);
DEFINE_SUITE("AMD IBS via core pmu", amd_ibs_via_core_pmu);
struct test_suite *arch_tests[] = {
#ifdef HAVE_DWARF_UNWIND_SUPPORT
@ -35,5 +36,6 @@ struct test_suite *arch_tests[] = {
&suite__bp_modify,
#endif
&suite__x86_sample_parsing,
&suite__amd_ibs_via_core_pmu,
NULL,
};