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Sat, 01 Nov 2025 08:44:34 -0700 (PDT) From: Anup Patel To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Paul Walmsley , Palmer Dabbelt , Greg KH , Alexander Shishkin , Ian Rogers Cc: Alexandre Ghiti , Peter Zijlstra , Ingo Molnar , Namhyung Kim , Mark Rutland , Jiri Olsa , Adrian Hunter , Liang Kan , Mayuresh Chitale , Anup Patel , Atish Patra , Andrew Jones , Sunil V L , linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Mayuresh Chitale , Anup Patel Subject: [PATCH v2 11/12] perf tools: Initial support for RISC-V trace decoder Date: Sat, 1 Nov 2025 21:12:44 +0530 Message-ID: <20251101154245.162492-12-apatel@ventanamicro.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251101154245.162492-1-apatel@ventanamicro.com> References: <20251101154245.162492-1-apatel@ventanamicro.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Mayuresh Chitale 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 Signed-off-by: Anup Patel Signed-off-by: Mayuresh Chitale --- 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 4be313cd115a..f736cea51fd8 100644 --- a/tools/perf/util/Build +++ b/tools/perf/util/Build @@ -145,6 +145,7 @@ perf-util-$(CONFIG_AUXTRACE) +=3D cs-etm.o perf-util-$(CONFIG_AUXTRACE) +=3D cs-etm-decoder/ endif perf-util-$(CONFIG_AUXTRACE) +=3D cs-etm-base.o +perf-util-$(CONFIG_AUXTRACE) +=3D rvtrace-decoder.o =20 perf-util-y +=3D parse-branch-options.o perf-util-y +=3D dump-insn.o diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c index c905563e0d8a..299991d5d305 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 "powerpc-vpadtl.h" =20 @@ -1395,6 +1396,8 @@ int perf_event__process_auxtrace_info(struct perf_ses= sion *session, err =3D powerpc_vpadtl_process_auxtrace_info(event, session); break; case PERF_AUXTRACE_RISCV_TRACE: + err =3D 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-de= coder.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 +#include +#include "evlist.h" +#include +#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_unus= ed, + 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 __m= aybe_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_unuse= d) +{ +} + +static void rvtrace_free(struct perf_session *session) +{ + struct rvtrace_decoder *ptr =3D container_of(session->auxtrace, struct rv= trace_decoder, + auxtrace); + + session->auxtrace =3D NULL; + free(ptr); +} + +static bool rvtrace_evsel_is_auxtrace(struct perf_session *session, + struct evsel *evsel) +{ + struct rvtrace_decoder *ptr =3D container_of(session->auxtrace, + struct rvtrace_decoder, auxtrace); + + return evsel->core.attr.type =3D=3D ptr->pmu_type; +} + +int rvtrace__process_auxtrace_info(union perf_event *event, + struct perf_session *session) +{ + struct perf_record_auxtrace_info *auxtrace_info =3D &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 =3D zalloc(sizeof(*ptr)); + if (!ptr) + return -ENOMEM; + + ptr->session =3D session; + ptr->machine =3D &session->machines.host; + ptr->auxtrace_type =3D auxtrace_info->type; + ptr->pmu_type =3D auxtrace_info->priv[0]; + + ptr->auxtrace.process_event =3D rvtrace_process_event; + ptr->auxtrace.process_auxtrace_event =3D rvtrace_process_auxtrace_event; + ptr->auxtrace.flush_events =3D rvtrace_flush; + ptr->auxtrace.free_events =3D rvtrace_free_events; + ptr->auxtrace.free =3D rvtrace_free; + ptr->auxtrace.evsel_is_auxtrace =3D rvtrace_evsel_is_auxtrace; + session->auxtrace =3D &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 @@ =20 #define RVTRACE_AUXTRACE_PRIV_SIZE sizeof(u64) =20 +int rvtrace__process_auxtrace_info(union perf_event *event, struct perf_se= ssion *session); +struct auxtrace_record *rvtrace_record_init(int *err); #endif --=20 2.43.0