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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 5f40bad215e0..fa848935003a 100644 --- a/drivers/hwtracing/rvtrace/rvtrace-core.c +++ b/drivers/hwtracing/rvtrace/rvtrace-core.c @@ -620,6 +620,50 @@ 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_reverse(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 00b63fa22da9..2a7d8afd27c8 100644 --- a/include/linux/rvtrace.h +++ b/include/linux/rvtrace.h @@ -277,10 +277,14 @@ 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 @@ -289,6 +293,8 @@ 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