From: Mayuresh Chitale <mayuresh.chitale@oss.qualcomm.com>
To: Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Palmer Dabbelt <palmer@dabbelt.com>,
Paul Walmsley <pjw@kernel.org>,
Greg KH <gregkh@linuxfoundation.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Ian Rogers <irogers@google.com>
Cc: Mayuresh Chitale <mayuresh.chitale@oss.qualcomm.com>,
Alexandre Ghiti <alex@ghiti.fr>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Namhyung Kim <namhyung@kernel.org>,
Mark Rutland <mark.rutland@arm.com>, Jiri Olsa <jolsa@kernel.org>,
Adrian Hunter <adrian.hunter@intel.com>,
Mayuresh Chitale <mchitale@gmail.com>,
Anup Patel <anup@brainfault.org>,
Atish Patra <atish.patra@linux.dev>,
Andrew Jones <andrew.jones@oss.qualcomm.com>,
Sunil V L <sunilvl@oss.qualcomm.com>,
linux-riscv@lists.infradead.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org,
Anup Patel <anup.patel@oss.qualcomm.com>,
Nutty Liu <nutty.liu@hotmail.com>,
Zane Leung <liangzhen@linux.spacemit.com>
Subject: [PATCH v6 12/14] perf tools: Add RISC-V trace PMU record capabilities
Date: Thu, 1 Oct 2026 10:52:23 +0530 [thread overview]
Message-ID: <20261001052243.3042627-13-mayuresh.chitale@oss.qualcomm.com> (raw)
In-Reply-To: <20261001052243.3042627-1-mayuresh.chitale@oss.qualcomm.com>
Introduce the required auxiliary API functions allowing the perf core
to interact with gtrace perf driver. On RISC-V systems the gtrace
PMU uses the RISC-V E-Trace components and optionally an ATB Bridge
component for connecting to ARM-side sinks, if it is present on the SoC.
Co-developed-by: Anup Patel <anup.patel@oss.qualcomm.com>
Signed-off-by: Anup Patel <anup.patel@oss.qualcomm.com>
Reviewed-by: Nutty Liu <nutty.liu@hotmail.com>
Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Mayuresh Chitale <mayuresh.chitale@oss.qualcomm.com>
---
tools/perf/arch/riscv/util/Build | 1 +
tools/perf/arch/riscv/util/auxtrace.c | 221 ++++++++++++++++++++++++++
tools/perf/util/auxtrace.c | 1 +
tools/perf/util/auxtrace.h | 1 +
tools/perf/util/gtrace.h | 17 ++
5 files changed, 241 insertions(+)
create mode 100644 tools/perf/arch/riscv/util/auxtrace.c
create mode 100644 tools/perf/util/gtrace.h
diff --git a/tools/perf/arch/riscv/util/Build b/tools/perf/arch/riscv/util/Build
index 2328fb9a30a3..e07d5525ece6 100644
--- a/tools/perf/arch/riscv/util/Build
+++ b/tools/perf/arch/riscv/util/Build
@@ -1 +1,2 @@
perf-util-y += header.o
+perf-util-y += 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..882632511d09
--- /dev/null
+++ b/tools/perf/arch/riscv/util/auxtrace.c
@@ -0,0 +1,221 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Risc-V E-Trace support
+ * Copyright (c) 2026 Qualcomm Technologies, Inc.
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/bitops.h>
+#include <linux/log2.h>
+#include <linux/zalloc.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <time.h>
+
+#include <internal/lib.h>
+#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/gtrace.h"
+#include "../../../util/parse-events.h"
+#include "../../../util/pmu.h"
+#include "../../../util/pmus.h"
+#include "../../../util/record.h"
+#include "../../../util/session.h"
+
+
+#define GTRACE_PMU_NAME "gtrace"
+#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 GTRACE_AUXTRACE_PRIV_SIZE;
+}
+
+static int rvtrace_info_fill(struct auxtrace_record *itr,
+ struct perf_session *session __maybe_unused,
+ 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 != GTRACE_AUXTRACE_PRIV_SIZE)
+ return -EINVAL;
+
+ auxtrace_info->type = PERF_AUXTRACE_GTRACE;
+ 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 " GTRACE_PMU_NAME " 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 0;
+}
+
+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_pmu = NULL;
+ struct evsel *evsel;
+
+ if (!evlist)
+ return NULL;
+
+ rvtrace_pmu = perf_pmus__find(GTRACE_PMU_NAME);
+ evlist__for_each_entry(evlist, evsel) {
+ if (rvtrace_pmu && !found_pmu)
+ found_pmu = find_pmu_for_event(&rvtrace_pmu, 1, evsel);
+ }
+
+ if (found_pmu)
+ 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 aa749e1c3036..1ecdde597153 100644
--- a/tools/perf/util/auxtrace.c
+++ b/tools/perf/util/auxtrace.c
@@ -1432,6 +1432,7 @@ int perf_event__process_auxtrace_info(const struct perf_tool *tool __maybe_unuse
case PERF_AUXTRACE_VPA_DTL:
err = powerpc_vpadtl_process_auxtrace_info(event, session);
break;
+ case PERF_AUXTRACE_GTRACE:
case PERF_AUXTRACE_UNKNOWN:
default:
return -EINVAL;
diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h
index 6947f3f284c0..42b1481ec894 100644
--- a/tools/perf/util/auxtrace.h
+++ b/tools/perf/util/auxtrace.h
@@ -46,6 +46,7 @@ enum auxtrace_type {
PERF_AUXTRACE_S390_CPUMSF,
PERF_AUXTRACE_HISI_PTT,
PERF_AUXTRACE_VPA_DTL,
+ PERF_AUXTRACE_GTRACE,
};
enum itrace_period_type {
diff --git a/tools/perf/util/gtrace.h b/tools/perf/util/gtrace.h
new file mode 100644
index 000000000000..343d2e9d4fa1
--- /dev/null
+++ b/tools/perf/util/gtrace.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2026 Qualcomm Technologies, Inc.
+ */
+
+#ifndef INCLUDE__UTIL_PERF_GTRACE_H__
+#define INCLUDE__UTIL_PERF_GTRACE_H__
+
+#include <linux/types.h>
+#include "util/event.h"
+
+struct perf_session;
+
+#define GTRACE_AUXTRACE_PRIV_SIZE sizeof(u64)
+
+#endif
+
--
2.43.0
next prev parent reply other threads:[~2026-10-01 5:25 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-01 5:22 [PATCH v6 00/14] Linux RISC-V trace framework and drivers Mayuresh Chitale
2026-10-01 5:22 ` [PATCH v6 01/14] dt-bindings: Add RISC-V trace component bindings Mayuresh Chitale
2026-10-01 5:33 ` sashiko-bot
2026-10-01 5:22 ` [PATCH v6 02/14] hwtracing: gtrace: Initial implementation of gtrace framework Mayuresh Chitale
2026-10-01 5:37 ` sashiko-bot
2026-10-01 5:22 ` [PATCH v6 03/14] gtrace: Add RISC-V platform driver for the " Mayuresh Chitale
2026-10-01 5:36 ` sashiko-bot
2026-10-01 5:22 ` [PATCH v6 04/14] gtrace: Add functions to create/destroy a trace component path Mayuresh Chitale
2026-10-01 5:36 ` sashiko-bot
2026-10-01 5:22 ` [PATCH v6 05/14] gtrace: Add functions to start/stop tracing on a " Mayuresh Chitale
2026-10-01 5:36 ` sashiko-bot
2026-10-01 5:22 ` [PATCH v6 06/14] gtrace: Add RISC-V Trace encoder driver Mayuresh Chitale
2026-10-01 5:34 ` sashiko-bot
2026-10-01 5:22 ` [PATCH v6 07/14] gtrace: Add function to copy into perf AUX buffer Mayuresh Chitale
2026-10-01 5:40 ` sashiko-bot
2026-10-01 5:22 ` [PATCH v6 08/14] perf: Add gtrace AUX buffer trace format type Mayuresh Chitale
2026-10-01 5:22 ` [PATCH v6 09/14] gtrace: Add RISC-V Trace ramsink driver Mayuresh Chitale
2026-10-01 5:42 ` sashiko-bot
2026-10-01 5:22 ` [PATCH v6 10/14] riscv: Enable DMA_RESTRICTED_POOL in defconfig Mayuresh Chitale
2026-10-01 5:22 ` [PATCH v6 11/14] gtrace: Add perf driver for tracing using perf tool Mayuresh Chitale
2026-10-01 5:44 ` sashiko-bot
2026-10-01 5:22 ` Mayuresh Chitale [this message]
2026-10-01 5:22 ` [PATCH v6 13/14] perf tools: Initial support for gtrace decoder Mayuresh Chitale
2026-10-01 5:35 ` sashiko-bot
2026-10-01 5:22 ` [PATCH v6 14/14] MAINTAINERS: Add entry for RISC-V trace framework Mayuresh Chitale
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