Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 309 insertions, 0 deletions

diff --git a/tools/perf/util/pfm.c b/tools/perf/util/pfm.c
new file mode 100644
index 000000000..862e4a689
--- /dev/null
+++ b/tools/perf/util/pfm.c
@@ -0,0 +1,309 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Support for libpfm4 event encoding.
+ *
+ * Copyright 2020 Google LLC.
+ */
+#include "util/cpumap.h"
+#include "util/debug.h"
+#include "util/event.h"
+#include "util/evlist.h"
+#include "util/evsel.h"
+#include "util/parse-events.h"
+#include "util/pmus.h"
+#include "util/pfm.h"
+#include "util/strbuf.h"
+#include "util/thread_map.h"
+
+#include <string.h>
+#include <linux/kernel.h>
+#include <perfmon/pfmlib_perf_event.h>
+
+static void libpfm_initialize(void)
+{
+	int ret;
+
+	ret = pfm_initialize();
+	if (ret != PFM_SUCCESS) {
+		ui__warning("libpfm failed to initialize: %s\n",
+			pfm_strerror(ret));
+	}
+}
+
+int parse_libpfm_events_option(const struct option *opt, const char *str,
+			int unset __maybe_unused)
+{
+	struct evlist *evlist = *(struct evlist **)opt->value;
+	struct perf_event_attr attr;
+	struct perf_pmu *pmu;
+	struct evsel *evsel, *grp_leader = NULL;
+	char *p, *q, *p_orig;
+	const char *sep;
+	int grp_evt = -1;
+	int ret;
+
+	libpfm_initialize();
+
+	p_orig = p = strdup(str);
+	if (!p)
+		return -1;
+	/*
+	 * force loading of the PMU list
+	 */
+	perf_pmus__scan(NULL);
+
+	for (q = p; strsep(&p, ",{}"); q = p) {
+		sep = p ? str + (p - p_orig - 1) : "";
+		if (*sep == '{') {
+			if (grp_evt > -1) {
+				ui__error(
+					"nested event groups not supported\n");
+				goto error;
+			}
+			grp_evt++;
+		}
+
+		/* no event */
+		if (*q == '\0') {
+			if (*sep == '}') {
+				if (grp_evt < 0) {
+					ui__error("cannot close a non-existing event group\n");
+					goto error;
+				}
+				grp_evt--;
+			}
+			continue;
+		}
+
+		memset(&attr, 0, sizeof(attr));
+		event_attr_init(&attr);
+
+		ret = pfm_get_perf_event_encoding(q, PFM_PLM0|PFM_PLM3,
+						&attr, NULL, NULL);
+
+		if (ret != PFM_SUCCESS) {
+			ui__error("failed to parse event %s : %s\n", str,
+				  pfm_strerror(ret));
+			goto error;
+		}
+
+		pmu = perf_pmus__find_by_type((unsigned int)attr.type);
+		evsel = parse_events__add_event(evlist->core.nr_entries,
+						&attr, q, /*metric_id=*/NULL,
+						pmu);
+		if (evsel == NULL)
+			goto error;
+
+		evsel->is_libpfm_event = true;
+
+		evlist__add(evlist, evsel);
+
+		if (grp_evt == 0)
+			grp_leader = evsel;
+
+		if (grp_evt > -1) {
+			evsel__set_leader(evsel, grp_leader);
+			grp_leader->core.nr_members++;
+			grp_evt++;
+		}
+
+		if (*sep == '}') {
+			if (grp_evt < 0) {
+				ui__error(
+				   "cannot close a non-existing event group\n");
+				goto error;
+			}
+			grp_leader = NULL;
+			grp_evt = -1;
+		}
+	}
+	free(p_orig);
+	return 0;
+error:
+	free(p_orig);
+	return -1;
+}
+
+static bool is_libpfm_event_supported(const char *name, struct perf_cpu_map *cpus,
+				      struct perf_thread_map *threads)
+{
+	struct perf_pmu *pmu;
+	struct evsel *evsel;
+	struct perf_event_attr attr = {};
+	bool result = true;
+	int ret;
+
+	ret = pfm_get_perf_event_encoding(name, PFM_PLM0|PFM_PLM3,
+					  &attr, NULL, NULL);
+	if (ret != PFM_SUCCESS)
+		return false;
+
+	pmu = perf_pmus__find_by_type((unsigned int)attr.type);
+	evsel = parse_events__add_event(0, &attr, name, /*metric_id=*/NULL, pmu);
+	if (evsel == NULL)
+		return false;
+
+	evsel->is_libpfm_event = true;
+
+	if (evsel__open(evsel, cpus, threads) < 0)
+		result = false;
+
+	evsel__close(evsel);
+	evsel__delete(evsel);
+
+	return result;
+}
+
+static const char *srcs[PFM_ATTR_CTRL_MAX] = {
+	[PFM_ATTR_CTRL_UNKNOWN] = "???",
+	[PFM_ATTR_CTRL_PMU] = "PMU",
+	[PFM_ATTR_CTRL_PERF_EVENT] = "perf_event",
+};
+
+static void
+print_attr_flags(struct strbuf *buf, const pfm_event_attr_info_t *info)
+{
+	if (info->is_dfl)
+		strbuf_addf(buf, "[default] ");
+
+	if (info->is_precise)
+		strbuf_addf(buf, "[precise] ");
+}
+
+static void
+print_libpfm_event(const struct print_callbacks *print_cb, void *print_state,
+		const pfm_pmu_info_t *pinfo, const pfm_event_info_t *info,
+		struct strbuf *buf)
+{
+	int j, ret;
+	char topic[80], name[80];
+	struct perf_cpu_map *cpus = perf_cpu_map__empty_new(1);
+	struct perf_thread_map *threads = thread_map__new_by_tid(0);
+
+	strbuf_setlen(buf, 0);
+	snprintf(topic, sizeof(topic), "pfm %s", pinfo->name);
+
+	snprintf(name, sizeof(name), "%s::%s", pinfo->name, info->name);
+	strbuf_addf(buf, "Code: 0x%"PRIx64"\n", info->code);
+
+	pfm_for_each_event_attr(j, info) {
+		pfm_event_attr_info_t ainfo;
+		const char *src;
+
+		ainfo.size = sizeof(ainfo);
+		ret = pfm_get_event_attr_info(info->idx, j, PFM_OS_PERF_EVENT_EXT, &ainfo);
+		if (ret != PFM_SUCCESS)
+			continue;
+
+		if (ainfo.ctrl >= PFM_ATTR_CTRL_MAX)
+			ainfo.ctrl = PFM_ATTR_CTRL_UNKNOWN;
+
+		src = srcs[ainfo.ctrl];
+		switch (ainfo.type) {
+		case PFM_ATTR_UMASK: /* Ignore for now */
+			break;
+		case PFM_ATTR_MOD_BOOL:
+			strbuf_addf(buf, " Modif: %s: [%s] : %s (boolean)\n", src,
+				    ainfo.name, ainfo.desc);
+			break;
+		case PFM_ATTR_MOD_INTEGER:
+			strbuf_addf(buf, " Modif: %s: [%s] : %s (integer)\n", src,
+				    ainfo.name, ainfo.desc);
+			break;
+		case PFM_ATTR_NONE:
+		case PFM_ATTR_RAW_UMASK:
+		case PFM_ATTR_MAX:
+		default:
+			strbuf_addf(buf, " Attr: %s: [%s] : %s\n", src,
+				    ainfo.name, ainfo.desc);
+		}
+	}
+
+	if (is_libpfm_event_supported(name, cpus, threads)) {
+		print_cb->print_event(print_state, pinfo->name, topic,
+				      name, info->equiv,
+				      /*scale_unit=*/NULL,
+				      /*deprecated=*/NULL, "PFM event",
+				      info->desc, /*long_desc=*/NULL,
+				      /*encoding_desc=*/buf->buf);
+	}
+
+	pfm_for_each_event_attr(j, info) {
+		pfm_event_attr_info_t ainfo;
+		const char *src;
+
+		strbuf_setlen(buf, 0);
+
+		ainfo.size = sizeof(ainfo);
+		ret = pfm_get_event_attr_info(info->idx, j, PFM_OS_PERF_EVENT_EXT, &ainfo);
+		if (ret != PFM_SUCCESS)
+			continue;
+
+		if (ainfo.ctrl >= PFM_ATTR_CTRL_MAX)
+			ainfo.ctrl = PFM_ATTR_CTRL_UNKNOWN;
+
+		src = srcs[ainfo.ctrl];
+		if (ainfo.type == PFM_ATTR_UMASK) {
+			strbuf_addf(buf, "Umask: 0x%02"PRIx64" : %s: ",
+				ainfo.code, src);
+			print_attr_flags(buf, &ainfo);
+			snprintf(name, sizeof(name), "%s::%s:%s",
+				 pinfo->name, info->name, ainfo.name);
+
+			if (!is_libpfm_event_supported(name, cpus, threads))
+				continue;
+
+			print_cb->print_event(print_state,
+					pinfo->name,
+					topic,
+					name, /*alias=*/NULL,
+					/*scale_unit=*/NULL,
+					/*deprecated=*/NULL, "PFM event",
+					ainfo.desc, /*long_desc=*/NULL,
+					/*encoding_desc=*/buf->buf);
+		}
+	}
+
+	perf_cpu_map__put(cpus);
+	perf_thread_map__put(threads);
+}
+
+void print_libpfm_events(const struct print_callbacks *print_cb, void *print_state)
+{
+	pfm_event_info_t info;
+	pfm_pmu_info_t pinfo;
+	int p, ret;
+	struct strbuf storage;
+
+	libpfm_initialize();
+
+	/* initialize to zero to indicate ABI version */
+	info.size  = sizeof(info);
+	pinfo.size = sizeof(pinfo);
+
+	strbuf_init(&storage, 2048);
+
+	pfm_for_all_pmus(p) {
+		ret = pfm_get_pmu_info(p, &pinfo);
+		if (ret != PFM_SUCCESS)
+			continue;
+
+		/* only print events that are supported by host HW */
+		if (!pinfo.is_present)
+			continue;
+
+		/* handled by perf directly */
+		if (pinfo.pmu == PFM_PMU_PERF_EVENT)
+			continue;
+
+		for (int i = pinfo.first_event; i != -1; i = pfm_get_event_next(i)) {
+			ret = pfm_get_event_info(i, PFM_OS_PERF_EVENT_EXT,
+						&info);
+			if (ret != PFM_SUCCESS)
+				continue;
+
+			print_libpfm_event(print_cb, print_state, &pinfo, &info, &storage);
+		}
+	}
+	strbuf_release(&storage);
+}