On Fri, 28 Jun 2024 13:23:32 +0000
Alice Ryhl <aliceryhl@xxxxxxxxxx> wrote:
> Make it possible to have Rust code call into tracepoints defined by C
> code. It is still required that the tracepoint is declared in a C
> header, and that this header is included in the input to bindgen.
>
> Signed-off-by: Alice Ryhl <aliceryhl@xxxxxxxxxx>
The Rust part LGTM. Some comment about the C part.
> ---
> include/linux/tracepoint.h | 18 +++++++++++++++-
> include/trace/define_trace.h | 12 +++++++++++
> rust/bindings/bindings_helper.h | 1 +
> rust/kernel/lib.rs | 1 +
> rust/kernel/tracepoint.rs | 47 +++++++++++++++++++++++++++++++++++++++++
> 5 files changed, 78 insertions(+), 1 deletion(-)
>
> diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
> index 689b6d71590e..d82af4d77c9f 100644
> --- a/include/linux/tracepoint.h
> +++ b/include/linux/tracepoint.h
> @@ -238,6 +238,20 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
> #define __DECLARE_TRACE_RCU(name, proto, args, cond)
> #endif
>
> +/*
> + * Declare an exported function that Rust code can call to trigger this
> + * tracepoint. This function does not include the static branch; that is done
> + * in Rust to avoid a function call when the tracepoint is disabled.
> + */
> +#define DEFINE_RUST_DO_TRACE(name, proto, args)
> +#define DEFINE_RUST_DO_TRACE_REAL(name, proto, args) \
> + notrace void rust_do_trace_##name(proto) \
> + { \
> + __DO_TRACE(name, \
> + TP_ARGS(args), \
> + cpu_online(raw_smp_processor_id()), 0); \
I guess this doesn't support conditions. Currently the conditions are
specified during declaration and not during definition.
Would it make sense to have
static inline void do_trace_##name(proto)
{
__DO_TRACE(name, TP_ARGS(args), TP_CONDITION(cond), 0);
}
in `__DECLARE_TRACE` and then simply call it in `rust_do_trace_##name`?
> + }
> +
> /*
> * Make sure the alignment of the structure in the __tracepoints section will
> * not add unwanted padding between the beginning of the section and the
> @@ -253,6 +267,7 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
> extern int __traceiter_##name(data_proto); \
> DECLARE_STATIC_CALL(tp_func_##name, __traceiter_##name); \
> extern struct tracepoint __tracepoint_##name; \
> + extern void rust_do_trace_##name(proto); \
> static inline void trace_##name(proto) \
> { \
> if (static_key_false(&__tracepoint_##name.key)) \
> @@ -337,7 +352,8 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
> void __probestub_##_name(void *__data, proto) \
> { \
> } \
> - DEFINE_STATIC_CALL(tp_func_##_name, __traceiter_##_name);
> + DEFINE_STATIC_CALL(tp_func_##_name, __traceiter_##_name); \
> + DEFINE_RUST_DO_TRACE(_name, TP_PROTO(proto), TP_ARGS(args))
>
> #define DEFINE_TRACE(name, proto, args) \
> DEFINE_TRACE_FN(name, NULL, NULL, PARAMS(proto), PARAMS(args));
> diff --git a/include/trace/define_trace.h b/include/trace/define_trace.h
> index 00723935dcc7..08ed5ce63a96 100644
> --- a/include/trace/define_trace.h
> +++ b/include/trace/define_trace.h
> @@ -72,6 +72,13 @@
> #define DECLARE_TRACE(name, proto, args) \
> DEFINE_TRACE(name, PARAMS(proto), PARAMS(args))
>
> +/* If requested, create helpers for calling these tracepoints from Rust. */
> +#ifdef CREATE_RUST_TRACE_POINTS
> +#undef DEFINE_RUST_DO_TRACE
> +#define DEFINE_RUST_DO_TRACE(name, proto, args) \
> + DEFINE_RUST_DO_TRACE_REAL(name, PARAMS(proto), PARAMS(args))
> +#endif
> +
> #undef TRACE_INCLUDE
> #undef __TRACE_INCLUDE
>
> @@ -129,6 +136,11 @@
> # undef UNDEF_TRACE_INCLUDE_PATH
> #endif
>
> +#ifdef CREATE_RUST_TRACE_POINTS
> +# undef DEFINE_RUST_DO_TRACE
> +# define DEFINE_RUST_DO_TRACE(name, proto, args)
> +#endif
> +
> /* We may be processing more files */
> #define CREATE_TRACE_POINTS
>
