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Wed, 01 Oct 2025 23:08:49 -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 04/11] rvtrace: Add functions to start/stop tracing on a component path Date: Thu, 2 Oct 2025 11:37:25 +0530 Message-ID: <20251002060732.100213-5-apatel@ventanamicro.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251002060732.100213-1-apatel@ventanamicro.com> References: <20251002060732.100213-1-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 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/r= vtrace/rvtrace-core.c index 7013d50ca569..109be40d4b24 100644 --- a/drivers/hwtracing/rvtrace/rvtrace-core.c +++ b/drivers/hwtracing/rvtrace/rvtrace-core.c @@ -614,6 +614,50 @@ static void rvtrace_release_path_nodes(struct rvtrace_= path *path) } } =20 +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 =3D node->comp; + rtdrv =3D to_rvtrace_driver(comp->dev.driver); + if (!rtdrv->start) + continue; + + ret =3D 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 =3D node->comp; + rtdrv =3D to_rvtrace_driver(comp->dev.driver); + if (!rtdrv->stop) + continue; + + ret =3D 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 f2174f463a69..e7bd335d388f 100644 --- a/include/linux/rvtrace.h +++ b/include/linux/rvtrace.h @@ -273,10 +273,14 @@ struct rvtrace_path *rvtrace_create_path(struct rvtra= ce_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); =20 /** * 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 @@ -285,6 +289,8 @@ 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, --=20 2.43.0