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Wed, 01 Oct 2025 23:08:21 -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, Anup Patel Subject: [PATCH 00/11] Linux RISC-V trace framework and drivers Date: Thu, 2 Oct 2025 11:37:21 +0530 Message-ID: <20251002060732.100213-1-apatel@ventanamicro.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This series adds initial support for RISC-V trace framework and drivers. The RISC-V trace v1.0 specification is already ratified and can be found at: https://github.com/riscv-non-isa/e-trace-encap/releases/tag/v1.0.0-ratified https://github.com/riscv-non-isa/tg-nexus-trace/releases/tag/1.0_Ratified The RISC-V trace framework and drivers are designed to be agnostic to the underlying trace protocol hence both RISC-V E-trace and RISC-V N-trace should work fine. The discovery of trace protocl parameters are left to user-space trace decoder. In ther future, there will be subsequent series adding: 1) Sysfs support 2) ACPI support 3) More trace drivers (such as funnel, ATB, etc) 4) Support for upcoming self-hosted trace specification 5) ... and more ... These patches can also be found in the riscv_trace_support_v1 branch at: https://github.com/avpatel/linux.git To test the patches, we need QEMU virt machine with RISC-V trace support which can be found in rv-etrace branch at: https://gitlab.com/danielhb/qemu.git To capture rvtrace data using perf on QEMU virt machine do the following: 1) Launch QEMU virt machine $ qemu-system-riscv64 -nographic -M virt -smp 2 -bios fw_dynamic.bin \ -kernel Image -append "root=/dev/vda rw console=ttyS0 earlycon=sbi" \ -drive file=/path/to/rootfs.img,id=disk1,if=none,format=raw \ -device virtio-blk-device,drive=disk1 2) Run perf record to capture rvtrace data $ perf record --all-cpus -e rvtrace/event=0x1/ 3) The step2 would create a perf.data file which has the rvtrace data. Now run perf report -D and look for PERF_RECORD_AUXTRACE event section(s) which point(s) to the actual rvtrace data offset. Anup Patel (5): dt-bindings: Add RISC-V trace component bindings rvtrace: Initial implementation of driver framework rvtrace: Add functions to create/destroy a trace component path rvtrace: Add function to copy into perf AUX buffer MAINTAINERS: Add entry for RISC-V trace framework and drivers Mayuresh Chitale (6): rvtrace: Add functions to start/stop tracing on a component path rvtrace: Add trace encoder driver rvtrace: Add trace ramsink driver rvtrace: Add perf driver for tracing using perf tool perf tools: Add RISC-V trace PMU record capabilities perf tools: Initial support for RISC-V trace decoder .../bindings/riscv/riscv,trace-component.yaml | 110 +++ MAINTAINERS | 11 + drivers/Makefile | 1 + drivers/hwtracing/Kconfig | 2 + drivers/hwtracing/rvtrace/Kconfig | 32 + drivers/hwtracing/rvtrace/Makefile | 6 + drivers/hwtracing/rvtrace/rvtrace-core.c | 781 ++++++++++++++++++ drivers/hwtracing/rvtrace/rvtrace-encoder.c | 107 +++ drivers/hwtracing/rvtrace/rvtrace-perf.c | 343 ++++++++ drivers/hwtracing/rvtrace/rvtrace-platform.c | 174 ++++ drivers/hwtracing/rvtrace/rvtrace-ramsink.c | 198 +++++ include/linux/rvtrace.h | 341 ++++++++ tools/perf/arch/riscv/util/Build | 1 + tools/perf/arch/riscv/util/auxtrace.c | 218 +++++ tools/perf/util/Build | 1 + tools/perf/util/auxtrace.c | 4 + tools/perf/util/auxtrace.h | 1 + tools/perf/util/rvtrace-decoder.c | 91 ++ tools/perf/util/rvtrace.h | 20 + 19 files changed, 2442 insertions(+) create mode 100644 Documentation/devicetree/bindings/riscv/riscv,trace-component.yaml create mode 100644 drivers/hwtracing/rvtrace/Kconfig create mode 100644 drivers/hwtracing/rvtrace/Makefile create mode 100644 drivers/hwtracing/rvtrace/rvtrace-core.c create mode 100644 drivers/hwtracing/rvtrace/rvtrace-encoder.c create mode 100644 drivers/hwtracing/rvtrace/rvtrace-perf.c create mode 100644 drivers/hwtracing/rvtrace/rvtrace-platform.c create mode 100644 drivers/hwtracing/rvtrace/rvtrace-ramsink.c create mode 100644 include/linux/rvtrace.h create mode 100644 tools/perf/arch/riscv/util/auxtrace.c create mode 100644 tools/perf/util/rvtrace-decoder.c create mode 100644 tools/perf/util/rvtrace.h -- 2.43.0