2 files changed, 120 insertions, 0 deletions

diff --git a/tools/perf/arch/s390/util/Build b/tools/perf/arch/s390/util/Build
index 5bd7b9260cc0..397084382b23 100644
--- a/tools/perf/arch/s390/util/Build
+++ b/tools/perf/arch/s390/util/Build
@@ -4,3 +4,5 @@ libperf-y += kvm-stat.o
 libperf-$(CONFIG_DWARF) += dwarf-regs.o
 
 libperf-y += machine.o
+
+libperf-$(CONFIG_AUXTRACE) += auxtrace.o
diff --git a/tools/perf/arch/s390/util/auxtrace.c b/tools/perf/arch/s390/util/auxtrace.c
new file mode 100644
index 000000000000..6cb48e4cffd9
--- /dev/null
+++ b/tools/perf/arch/s390/util/auxtrace.c
@@ -0,0 +1,118 @@
+#include <stdbool.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/bitops.h>
+#include <linux/log2.h>
+
+#include "../../util/evlist.h"
+#include "../../util/auxtrace.h"
+#include "../../util/evsel.h"
+
+#define PERF_EVENT_CPUM_SF              0xB0000 /* Event: Basic-sampling */
+#define PERF_EVENT_CPUM_SF_DIAG         0xBD000 /* Event: Combined-sampling */
+#define DEFAULT_AUX_PAGES               128
+#define DEFAULT_FREQ                    4000
+
+static void cpumsf_free(struct auxtrace_record *itr)
+{
+        free(itr);
+}
+
+static size_t cpumsf_info_priv_size(struct auxtrace_record *itr __maybe_unused,
+                                    struct perf_evlist *evlist __maybe_unused)
+{
+        return 0;
+}
+
+static int
+cpumsf_info_fill(struct auxtrace_record *itr __maybe_unused,
+                 struct perf_session *session __maybe_unused,
+                 struct auxtrace_info_event *auxtrace_info __maybe_unused,
+                 size_t priv_size __maybe_unused)
+{
+        return 0;
+}
+
+static unsigned long
+cpumsf_reference(struct auxtrace_record *itr __maybe_unused)
+{
+        return 0;
+}
+
+static int
+cpumsf_recording_options(struct auxtrace_record *ar __maybe_unused,
+                         struct perf_evlist *evlist __maybe_unused,
+                         struct record_opts *opts)
+{
+        unsigned int factor = 1;
+        unsigned int pages;
+
+        opts->full_auxtrace = true;
+
+        /*
+         * The AUX buffer size should be set properly to avoid
+         * overflow of samples if it is not set explicitly.
+         * DEFAULT_AUX_PAGES is an proper size when sampling frequency
+         * is DEFAULT_FREQ. It is expected to hold about 1/2 second
+         * of sampling data. The size used for AUX buffer will scale
+         * according to the specified frequency and DEFAULT_FREQ.
+         */
+        if (!opts->auxtrace_mmap_pages) {
+                if (opts->user_freq != UINT_MAX)
+                        factor = (opts->user_freq + DEFAULT_FREQ
+                                  - 1) / DEFAULT_FREQ;
+                pages = DEFAULT_AUX_PAGES * factor;
+                opts->auxtrace_mmap_pages = roundup_pow_of_two(pages);
+        }
+
+        return 0;
+}
+
+static int
+cpumsf_parse_snapshot_options(struct auxtrace_record *itr __maybe_unused,
+                              struct record_opts *opts __maybe_unused,
+                              const char *str __maybe_unused)
+{
+        return 0;
+}
+
+/*
+ * auxtrace_record__init is called when perf record
+ * check if the event really need auxtrace
+ */
+struct auxtrace_record *auxtrace_record__init(struct perf_evlist *evlist,
+                                              int *err)
+{
+        struct auxtrace_record *aux;
+        struct perf_evsel *pos;
+        int diagnose = 0;
+
+        if (evlist->nr_entries == 0)
+                return NULL;
+
+        evlist__for_each_entry(evlist, pos) {
+                if (pos->attr.config == PERF_EVENT_CPUM_SF_DIAG) {
+                        diagnose = 1;
+                        break;
+                }
+        }
+
+        if (!diagnose)
+                return NULL;
+
+        /* sampling in diagnose mode. alloc aux buffer */
+        aux = zalloc(sizeof(*aux));
+        if (aux == NULL) {
+                *err = -ENOMEM;
+                return NULL;
+        }
+
+        aux->parse_snapshot_options = cpumsf_parse_snapshot_options;
+        aux->recording_options = cpumsf_recording_options;
+        aux->info_priv_size = cpumsf_info_priv_size;
+        aux->info_fill = cpumsf_info_fill;
+        aux->free = cpumsf_free;
+        aux->reference = cpumsf_reference;
+
+        return aux;
+}