From b3be39c51cc58eb60c698cf64987e9d465a9263a Mon Sep 17 00:00:00 2001 From: Thomas Richter Date: Tue, 13 Feb 2018 16:14:19 +0100 Subject: [PATCH] perf test: Fix test case 23 for s390 z/VM or KVM guests On s390 perf can be executed on a LPAR with support for hardware events (i. e. cycles) or on a z/VM or KVM guest where no hardware events are supported. In this environment use software event named cpu-clock for this test case. Use the cpuid infrastructure functions to determine the cpuid on s390 which contains an indication of the cpu counter facility availability. Signed-off-by: Thomas Richter Reviewed-by: Hendrik Brueckner Cc: Heiko Carstens Cc: Martin Schwidefsky Link: http://lkml.kernel.org/r/20180213151419.80737-4-tmricht@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/tests/code-reading.c | 33 +++++++++++++++++++++++++++++---- 1 file changed, 29 insertions(+), 4 deletions(-) diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c index 3bf7b145b826..c7115d369511 100644 --- a/tools/perf/tests/code-reading.c +++ b/tools/perf/tests/code-reading.c @@ -482,6 +482,34 @@ static void fs_something(void) } } +static const char *do_determine_event(bool excl_kernel) +{ + const char *event = excl_kernel ? "cycles:u" : "cycles"; + +#ifdef __s390x__ + char cpuid[128], model[16], model_c[16], cpum_cf_v[16]; + unsigned int family; + int ret, cpum_cf_a; + + if (get_cpuid(cpuid, sizeof(cpuid))) + goto out_clocks; + ret = sscanf(cpuid, "%*[^,],%u,%[^,],%[^,],%[^,],%x", &family, model_c, + model, cpum_cf_v, &cpum_cf_a); + if (ret != 5) /* Not available */ + goto out_clocks; + if (excl_kernel && (cpum_cf_a & 4)) + return event; + if (!excl_kernel && (cpum_cf_a & 2)) + return event; + + /* Fall through: missing authorization */ +out_clocks: + event = excl_kernel ? "cpu-clock:u" : "cpu-clock"; + +#endif + return event; +} + static void do_something(void) { fs_something(); @@ -592,10 +620,7 @@ static int do_test_code_reading(bool try_kcore) perf_evlist__set_maps(evlist, cpus, threads); - if (excl_kernel) - str = "cycles:u"; - else - str = "cycles"; + str = do_determine_event(excl_kernel); pr_debug("Parsing event '%s'\n", str); ret = parse_events(evlist, str, NULL); if (ret < 0) { -- 2.30.2