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Sat, 01 Nov 2025 08:43:35 -0700 (PDT) Received: from localhost.localdomain ([122.171.20.36]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-295269bd2fesm59990105ad.105.2025.11.01.08.43.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 01 Nov 2025 08:43:34 -0700 (PDT) From: Anup Patel To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Paul Walmsley , Palmer Dabbelt , Greg KH , Alexander Shishkin , Ian Rogers Subject: [PATCH v2 04/12] rvtrace: Add functions to start/stop tracing on a component path Date: Sat, 1 Nov 2025 21:12:37 +0530 Message-ID: <20251101154245.162492-5-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> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251101_084336_559387_7DD9406E X-CRM114-Status: GOOD ( 13.99 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , devicetree@vger.kernel.org, Alexandre Ghiti , Atish Patra , Peter Zijlstra , Anup Patel , Adrian Hunter , linux-kernel@vger.kernel.org, Mayuresh Chitale , Ingo Molnar , Jiri Olsa , Anup Patel , Mayuresh Chitale , Namhyung Kim , linux-riscv@lists.infradead.org, Andrew Jones , Liang Kan Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org From: Mayuresh Chitale The perf driver framework needs to be able to start / stop all components in a trace component path during its operation. Add rvtrace_path_start() and rvtrace_path_stop() functions for this purpose. Co-developed-by: Anup Patel Signed-off-by: Anup Patel Signed-off-by: Mayuresh Chitale --- drivers/hwtracing/rvtrace/rvtrace-core.c | 44 ++++++++++++++++++++++++ include/linux/rvtrace.h | 6 ++++ 2 files changed, 50 insertions(+) diff --git a/drivers/hwtracing/rvtrace/rvtrace-core.c b/drivers/hwtracing/rvtrace/rvtrace-core.c index 7006a4469d62..35bd77d6880a 100644 --- a/drivers/hwtracing/rvtrace/rvtrace-core.c +++ b/drivers/hwtracing/rvtrace/rvtrace-core.c @@ -631,6 +631,50 @@ static void rvtrace_release_path_nodes(struct rvtrace_path *path) } } +int rvtrace_path_start(struct rvtrace_path *path) +{ + const struct rvtrace_driver *rtdrv; + struct rvtrace_component *comp; + struct rvtrace_path_node *node; + int ret; + + list_for_each_entry(node, &path->comp_list, head) { + comp = node->comp; + rtdrv = to_rvtrace_driver(comp->dev.driver); + if (!rtdrv->start) + continue; + + ret = rtdrv->start(comp); + if (ret) + return ret; + } + + return 0; +} +EXPORT_SYMBOL_GPL(rvtrace_path_start); + +int rvtrace_path_stop(struct rvtrace_path *path) +{ + const struct rvtrace_driver *rtdrv; + struct rvtrace_component *comp; + struct rvtrace_path_node *node; + int ret; + + list_for_each_entry(node, &path->comp_list, head) { + comp = node->comp; + rtdrv = to_rvtrace_driver(comp->dev.driver); + if (!rtdrv->stop) + continue; + + ret = rtdrv->stop(comp); + if (ret) + return ret; + } + + return 0; +} +EXPORT_SYMBOL_GPL(rvtrace_path_stop); + struct rvtrace_path *rvtrace_create_path(struct rvtrace_component *source, struct rvtrace_component *sink, enum rvtrace_component_mode mode) diff --git a/include/linux/rvtrace.h b/include/linux/rvtrace.h index 4b31ab96e721..e2842e8728d4 100644 --- a/include/linux/rvtrace.h +++ b/include/linux/rvtrace.h @@ -274,10 +274,14 @@ struct rvtrace_path *rvtrace_create_path(struct rvtrace_component *source, struct rvtrace_component *sink, enum rvtrace_component_mode mode); void rvtrace_destroy_path(struct rvtrace_path *path); +int rvtrace_path_start(struct rvtrace_path *path); +int rvtrace_path_stop(struct rvtrace_path *path); /** * struct rvtrace_driver - Representation of a RISC-V trace driver * id_table: Table to match components handled by the driver + * start: Callback to start tracing + * stop: Callback to stop tracing * probe: Driver probe() function * remove: Driver remove() function * get_trace_id: Get/allocate a trace ID @@ -286,6 +290,8 @@ void rvtrace_destroy_path(struct rvtrace_path *path); */ struct rvtrace_driver { const struct rvtrace_component_id *id_table; + int (*start)(struct rvtrace_component *comp); + int (*stop)(struct rvtrace_component *comp); int (*probe)(struct rvtrace_component *comp); void (*remove)(struct rvtrace_component *comp); int (*get_trace_id)(struct rvtrace_component *comp, -- 2.43.0 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv