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Message-ID: <20251002060732.100213-11-apatel@ventanamicro.com>
Date: Thu, 2 Oct 2025 11:37:31 +0530
From: Anup Patel <apatel@...tanamicro.com>
To: Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Greg KH <gregkh@...uxfoundation.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Ian Rogers <irogers@...gle.com>
Cc: Alexandre Ghiti <alex@...ti.fr>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Namhyung Kim <namhyung@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Jiri Olsa <jolsa@...nel.org>,
Adrian Hunter <adrian.hunter@...el.com>,
Liang Kan <kan.liang@...ux.intel.com>,
Mayuresh Chitale <mchitale@...il.com>,
Anup Patel <anup@...infault.org>,
Atish Patra <atish.patra@...ux.dev>,
Andrew Jones <ajones@...tanamicro.com>,
Sunil V L <sunilvl@...tanamicro.com>,
linux-riscv@...ts.infradead.org,
devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
Mayuresh Chitale <mchitale@...tanamicro.com>,
Anup Patel <apatel@...tanamicro.com>
Subject: [PATCH 10/11] perf tools: Initial support for RISC-V trace decoder
From: Mayuresh Chitale <mchitale@...tanamicro.com>
Add bare bones support for RISC-V trace decoder so that the data received
from the hardware by the RISC-V trace perf driver can be written to the
perf record output file.
Co-developed-by: Anup Patel <apatel@...tanamicro.com>
Signed-off-by: Anup Patel <apatel@...tanamicro.com>
Signed-off-by: Mayuresh Chitale <mchitale@...tanamicro.com>
---
tools/perf/util/Build | 1 +
tools/perf/util/auxtrace.c | 3 +
tools/perf/util/rvtrace-decoder.c | 91 +++++++++++++++++++++++++++++++
tools/perf/util/rvtrace.h | 2 +
4 files changed, 97 insertions(+)
create mode 100644 tools/perf/util/rvtrace-decoder.c
diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 4959e7a990e4..2305638283c4 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -142,6 +142,7 @@ perf-util-$(CONFIG_AUXTRACE) += cs-etm.o
perf-util-$(CONFIG_AUXTRACE) += cs-etm-decoder/
endif
perf-util-$(CONFIG_AUXTRACE) += cs-etm-base.o
+perf-util-$(CONFIG_AUXTRACE) += rvtrace-decoder.o
perf-util-y += parse-branch-options.o
perf-util-y += dump-insn.o
diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c
index 735f6c360064..5ccb5f3d9af8 100644
--- a/tools/perf/util/auxtrace.c
+++ b/tools/perf/util/auxtrace.c
@@ -54,6 +54,7 @@
#include "arm-spe.h"
#include "hisi-ptt.h"
#include "s390-cpumsf.h"
+#include "rvtrace.h"
#include "util/mmap.h"
#include <linux/ctype.h>
@@ -1394,6 +1395,8 @@ int perf_event__process_auxtrace_info(struct perf_session *session,
err = hisi_ptt_process_auxtrace_info(event, session);
break;
case PERF_AUXTRACE_RISCV_TRACE:
+ err = rvtrace__process_auxtrace_info(event, session);
+ break;
case PERF_AUXTRACE_UNKNOWN:
default:
return -EINVAL;
diff --git a/tools/perf/util/rvtrace-decoder.c b/tools/perf/util/rvtrace-decoder.c
new file mode 100644
index 000000000000..58db5ca62c1a
--- /dev/null
+++ b/tools/perf/util/rvtrace-decoder.c
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * RISC-V trace Decoder
+ */
+
+#include <errno.h>
+#include <inttypes.h>
+#include "evlist.h"
+#include <internal/lib.h>
+#include "rvtrace.h"
+
+struct rvtrace_decoder {
+ struct auxtrace auxtrace;
+ u32 auxtrace_type;
+ struct perf_session *session;
+ struct machine *machine;
+ u32 pmu_type;
+};
+
+static int rvtrace_process_event(struct perf_session *session __maybe_unused,
+ union perf_event *event __maybe_unused,
+ struct perf_sample *sample __maybe_unused,
+ const struct perf_tool *tool __maybe_unused)
+{
+ return 0;
+}
+
+static int rvtrace_process_auxtrace_event(struct perf_session *session __maybe_unused,
+ union perf_event *event __maybe_unused,
+ const struct perf_tool *tool __maybe_unused)
+{
+ return 0;
+}
+
+static int rvtrace_flush(struct perf_session *session __maybe_unused,
+ const struct perf_tool *tool __maybe_unused)
+{
+ return 0;
+}
+
+static void rvtrace_free_events(struct perf_session *session __maybe_unused)
+{
+}
+
+static void rvtrace_free(struct perf_session *session)
+{
+ struct rvtrace_decoder *ptr = container_of(session->auxtrace, struct rvtrace_decoder,
+ auxtrace);
+
+ session->auxtrace = NULL;
+ free(ptr);
+}
+
+static bool rvtrace_evsel_is_auxtrace(struct perf_session *session,
+ struct evsel *evsel)
+{
+ struct rvtrace_decoder *ptr = container_of(session->auxtrace,
+ struct rvtrace_decoder, auxtrace);
+
+ return evsel->core.attr.type == ptr->pmu_type;
+}
+
+int rvtrace__process_auxtrace_info(union perf_event *event,
+ struct perf_session *session)
+{
+ struct perf_record_auxtrace_info *auxtrace_info = &event->auxtrace_info;
+ struct rvtrace_decoder *ptr;
+
+ if (auxtrace_info->header.size < RVTRACE_AUXTRACE_PRIV_SIZE +
+ sizeof(struct perf_record_auxtrace_info))
+ return -EINVAL;
+
+ ptr = zalloc(sizeof(*ptr));
+ if (!ptr)
+ return -ENOMEM;
+
+ ptr->session = session;
+ ptr->machine = &session->machines.host;
+ ptr->auxtrace_type = auxtrace_info->type;
+ ptr->pmu_type = auxtrace_info->priv[0];
+
+ ptr->auxtrace.process_event = rvtrace_process_event;
+ ptr->auxtrace.process_auxtrace_event = rvtrace_process_auxtrace_event;
+ ptr->auxtrace.flush_events = rvtrace_flush;
+ ptr->auxtrace.free_events = rvtrace_free_events;
+ ptr->auxtrace.free = rvtrace_free;
+ ptr->auxtrace.evsel_is_auxtrace = rvtrace_evsel_is_auxtrace;
+ session->auxtrace = &ptr->auxtrace;
+
+ return 0;
+}
diff --git a/tools/perf/util/rvtrace.h b/tools/perf/util/rvtrace.h
index 93c041db8660..fdf2e5866c85 100644
--- a/tools/perf/util/rvtrace.h
+++ b/tools/perf/util/rvtrace.h
@@ -15,4 +15,6 @@
#define RVTRACE_AUXTRACE_PRIV_SIZE sizeof(u64)
+int rvtrace__process_auxtrace_info(union perf_event *event, struct perf_session *session);
+struct auxtrace_record *rvtrace_record_init(int *err);
#endif
--
2.43.0
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