summaryrefslogtreecommitdiffstats
path: root/tools/perf/arch/s390/util/auxtrace.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--tools/perf/arch/s390/util/auxtrace.c123
1 files changed, 123 insertions, 0 deletions
diff --git a/tools/perf/arch/s390/util/auxtrace.c b/tools/perf/arch/s390/util/auxtrace.c
new file mode 100644
index 000000000..0db5c58c9
--- /dev/null
+++ b/tools/perf/arch/s390/util/auxtrace.c
@@ -0,0 +1,123 @@
+#include <stdbool.h>
+#include <stdlib.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/bitops.h>
+#include <linux/log2.h>
+#include <linux/zalloc.h>
+
+#include "../../util/evlist.h"
+#include "../../util/auxtrace.h"
+#include "../../util/evsel.h"
+#include "../../util/record.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 evlist *evlist __maybe_unused)
+{
+ return 0;
+}
+
+static int
+cpumsf_info_fill(struct auxtrace_record *itr __maybe_unused,
+ struct perf_session *session __maybe_unused,
+ struct perf_record_auxtrace_info *auxtrace_info __maybe_unused,
+ size_t priv_size __maybe_unused)
+{
+ auxtrace_info->type = PERF_AUXTRACE_S390_CPUMSF;
+ 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 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 evlist *evlist,
+ int *err)
+{
+ struct auxtrace_record *aux;
+ struct evsel *pos;
+ int diagnose = 0;
+
+ *err = 0;
+ if (evlist->core.nr_entries == 0)
+ return NULL;
+
+ evlist__for_each_entry(evlist, pos) {
+ if (pos->core.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;
+}