[PATCH 09/11] perf tools: Add RISC-V trace PMU record capabilities

[Anup Patel <apatel@ventanamicro.com>]

From: Mayuresh Chitale <mchitale@ventanamicro.com>

Introduce the required auxiliary API functions allowing the perf core
to interact with RISC-V trace perf driver.

Co-developed-by: Anup Patel <apatel@ventanamicro.com>
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Signed-off-by: Mayuresh Chitale <mchitale@ventanamicro.com>
---
 tools/perf/arch/riscv/util/Build      |   1 +
 tools/perf/arch/riscv/util/auxtrace.c | 218 ++++++++++++++++++++++++++
 tools/perf/util/auxtrace.c            |   1 +
 tools/perf/util/auxtrace.h            |   1 +
 tools/perf/util/rvtrace.h             |  18 +++
 5 files changed, 239 insertions(+)
 create mode 100644 tools/perf/arch/riscv/util/auxtrace.c
 create mode 100644 tools/perf/util/rvtrace.h

diff --git a/tools/perf/arch/riscv/util/Build b/tools/perf/arch/riscv/util/Build
index 58a672246024..2ba1fb98a0ad 100644
--- a/tools/perf/arch/riscv/util/Build
+++ b/tools/perf/arch/riscv/util/Build
@@ -3,3 +3,4 @@ perf-util-y += header.o
 
 perf-util-$(CONFIG_LIBTRACEEVENT) += kvm-stat.o
 perf-util-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o
+perf-util-$(CONFIG_AUXTRACE) += auxtrace.o
diff --git a/tools/perf/arch/riscv/util/auxtrace.c b/tools/perf/arch/riscv/util/auxtrace.c
new file mode 100644
index 000000000000..adc86bd38998
--- /dev/null
+++ b/tools/perf/arch/riscv/util/auxtrace.c
@@ -0,0 +1,218 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Risc-V E-Trace support
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/bitops.h>
+#include <linux/log2.h>
+#include <linux/zalloc.h>
+#include <time.h>
+
+#include <internal/lib.h> // page_size
+#include "../../../util/auxtrace.h"
+#include "../../../util/cpumap.h"
+#include "../../../util/debug.h"
+#include "../../../util/event.h"
+#include "../../../util/evlist.h"
+#include "../../../util/evsel.h"
+#include "../../../util/rvtrace.h"
+#include "../../../util/pmu.h"
+#include "../../../util/record.h"
+#include "../../../util/session.h"
+#include "../../../util/tsc.h"
+
+#define RVTRACE_PMU_NAME "rvtrace"
+#define KiB(x) ((x) * 1024)
+#define MiB(x) ((x) * 1024 * 1024)
+
+struct rvtrace_recording {
+	struct auxtrace_record	itr;
+	struct perf_pmu *rvtrace_pmu;
+	struct evlist *evlist;
+};
+
+static size_t rvtrace_info_priv_size(struct auxtrace_record *itr __maybe_unused,
+				     struct evlist *evlist __maybe_unused)
+{
+	return RVTRACE_AUXTRACE_PRIV_SIZE;
+}
+
+static int rvtrace_info_fill(struct auxtrace_record *itr, struct perf_session *session,
+			     struct perf_record_auxtrace_info *auxtrace_info, size_t priv_size)
+{
+	struct rvtrace_recording *ptr = container_of(itr, struct rvtrace_recording, itr);
+	struct perf_pmu *rvtrace_pmu = ptr->rvtrace_pmu;
+
+	if (priv_size != RVTRACE_AUXTRACE_PRIV_SIZE)
+		return -EINVAL;
+
+	if (!session->evlist->core.nr_mmaps)
+		return -EINVAL;
+
+	auxtrace_info->type = PERF_AUXTRACE_RISCV_TRACE;
+	auxtrace_info->priv[0] = rvtrace_pmu->type;
+
+	return 0;
+}
+
+static int rvtrace_set_auxtrace_mmap_page(struct record_opts *opts)
+{
+	bool privileged = perf_event_paranoid_check(-1);
+
+	if (!opts->full_auxtrace)
+		return 0;
+
+	if (opts->full_auxtrace && !opts->auxtrace_mmap_pages) {
+		if (privileged) {
+			opts->auxtrace_mmap_pages = MiB(16) / page_size;
+		} else {
+			opts->auxtrace_mmap_pages = KiB(128) / page_size;
+			if (opts->mmap_pages == UINT_MAX)
+				opts->mmap_pages = KiB(256) / page_size;
+		}
+	}
+
+	/* Validate auxtrace_mmap_pages */
+	if (opts->auxtrace_mmap_pages) {
+		size_t sz = opts->auxtrace_mmap_pages * (size_t)page_size;
+		size_t min_sz = KiB(8);
+
+		if (sz < min_sz || !is_power_of_2(sz)) {
+			pr_err("Invalid mmap size : must be at least %zuKiB and a power of 2\n",
+			       min_sz / 1024);
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+static int rvtrace_recording_options(struct auxtrace_record *itr, struct evlist *evlist,
+				     struct record_opts *opts)
+{
+	struct rvtrace_recording *ptr = container_of(itr, struct rvtrace_recording, itr);
+	struct perf_pmu *rvtrace_pmu = ptr->rvtrace_pmu;
+	struct evsel *evsel, *rvtrace_evsel = NULL;
+	struct evsel *tracking_evsel;
+	int err;
+
+	ptr->evlist = evlist;
+	evlist__for_each_entry(evlist, evsel) {
+		if (evsel->core.attr.type == rvtrace_pmu->type) {
+			if (rvtrace_evsel) {
+				pr_err("There may be only one " RVTRACE_PMU_NAME "x event\n");
+				return -EINVAL;
+			}
+			evsel->core.attr.freq = 0;
+			evsel->core.attr.sample_period = 1;
+			evsel->needs_auxtrace_mmap = true;
+			rvtrace_evsel = evsel;
+			opts->full_auxtrace = true;
+		}
+	}
+
+	err = rvtrace_set_auxtrace_mmap_page(opts);
+	if (err)
+		return err;
+	/*
+	 * To obtain the auxtrace buffer file descriptor, the auxtrace event
+	 * must come first.
+	 */
+	evlist__to_front(evlist, rvtrace_evsel);
+	evsel__set_sample_bit(rvtrace_evsel, TIME);
+
+	/* Add dummy event to keep tracking */
+	err = parse_event(evlist, "dummy:u");
+	if (err)
+		return err;
+
+	tracking_evsel = evlist__last(evlist);
+	evlist__set_tracking_event(evlist, tracking_evsel);
+
+	tracking_evsel->core.attr.freq = 0;
+	tracking_evsel->core.attr.sample_period = 1;
+	evsel__set_sample_bit(tracking_evsel, TIME);
+
+	return 0;
+}
+
+static u64 rvtrace_reference(struct auxtrace_record *itr __maybe_unused)
+{
+	return rdtsc();
+}
+
+static void rvtrace_recording_free(struct auxtrace_record *itr)
+{
+	struct rvtrace_recording *ptr =
+			container_of(itr, struct rvtrace_recording, itr);
+
+	free(ptr);
+}
+
+static struct auxtrace_record *rvtrace_recording_init(int *err, struct perf_pmu *rvtrace_pmu)
+{
+	struct rvtrace_recording *ptr;
+
+	if (!rvtrace_pmu) {
+		*err = -ENODEV;
+		return NULL;
+	}
+
+	ptr = zalloc(sizeof(*ptr));
+	if (!ptr) {
+		*err = -ENOMEM;
+		return NULL;
+	}
+
+	ptr->rvtrace_pmu = rvtrace_pmu;
+	ptr->itr.recording_options = rvtrace_recording_options;
+	ptr->itr.info_priv_size = rvtrace_info_priv_size;
+	ptr->itr.info_fill = rvtrace_info_fill;
+	ptr->itr.free = rvtrace_recording_free;
+	ptr->itr.reference = rvtrace_reference;
+	ptr->itr.read_finish = auxtrace_record__read_finish;
+	ptr->itr.alignment = 0;
+
+	*err = 0;
+	return &ptr->itr;
+}
+
+static struct perf_pmu *find_pmu_for_event(struct perf_pmu **pmus,
+					   int pmu_nr, struct evsel *evsel)
+{
+	int i;
+
+	if (!pmus)
+		return NULL;
+
+	for (i = 0; i < pmu_nr; i++) {
+		if (evsel->core.attr.type == pmus[i]->type)
+			return pmus[i];
+	}
+
+	return NULL;
+}
+
+struct auxtrace_record *auxtrace_record__init(struct evlist *evlist, int *err)
+{
+	struct perf_pmu	*rvtrace_pmu = NULL;
+	struct perf_pmu *found_etm = NULL;
+	struct evsel *evsel;
+
+	if (!evlist)
+		return NULL;
+
+	rvtrace_pmu = perf_pmus__find(RVTRACE_PMU_NAME);
+	evlist__for_each_entry(evlist, evsel) {
+		if (rvtrace_pmu && !found_etm)
+			found_etm = find_pmu_for_event(&rvtrace_pmu, 1, evsel);
+	}
+
+	if (found_etm)
+		return rvtrace_recording_init(err, rvtrace_pmu);
+
+	*err = 0;
+	return NULL;
+}
diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c
index ebd32f1b8f12..735f6c360064 100644
--- a/tools/perf/util/auxtrace.c
+++ b/tools/perf/util/auxtrace.c
@@ -1393,6 +1393,7 @@ int perf_event__process_auxtrace_info(struct perf_session *session,
 	case PERF_AUXTRACE_HISI_PTT:
 		err = hisi_ptt_process_auxtrace_info(event, session);
 		break;
+	case PERF_AUXTRACE_RISCV_TRACE:
 	case PERF_AUXTRACE_UNKNOWN:
 	default:
 		return -EINVAL;
diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h
index f001cbb68f8e..5b7ce4a99709 100644
--- a/tools/perf/util/auxtrace.h
+++ b/tools/perf/util/auxtrace.h
@@ -50,6 +50,7 @@ enum auxtrace_type {
 	PERF_AUXTRACE_ARM_SPE,
 	PERF_AUXTRACE_S390_CPUMSF,
 	PERF_AUXTRACE_HISI_PTT,
+	PERF_AUXTRACE_RISCV_TRACE,
 };
 
 enum itrace_period_type {
diff --git a/tools/perf/util/rvtrace.h b/tools/perf/util/rvtrace.h
new file mode 100644
index 000000000000..93c041db8660
--- /dev/null
+++ b/tools/perf/util/rvtrace.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright(C) 2015 Linaro Limited. All rights reserved.
+ * Author: Mathieu Poirier <mathieu.poirier@linaro.org>
+ */
+
+#ifndef INCLUDE__UTIL_PERF_RVTRACE_H__
+#define INCLUDE__UTIL_PERF_RVTRACE_H__
+
+#include "debug.h"
+#include "auxtrace.h"
+#include "util/event.h"
+#include "util/session.h"
+#include <linux/bits.h>
+
+#define RVTRACE_AUXTRACE_PRIV_SIZE	sizeof(u64)
+
+#endif
-- 
2.43.0


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