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Merge tag 'trace-rust-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

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Pull rust trace event support from Steven Rostedt:
 "Allow Rust code to have trace events

  Trace events is a popular way to debug what is happening inside the
  kernel or just to find out what is happening. Rust code is being added
  to the Linux kernel but it currently does not support the tracing
  infrastructure. Add support of trace events inside Rust code"

* tag 'trace-rust-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  rust: jump_label: skip formatting generated file
  jump_label: rust: pass a mut ptr to `static_key_count`
  samples: rust: fix `rust_print` build making it a combined module
  rust: add arch_static_branch
  jump_label: adjust inline asm to be consistent
  rust: samples: add tracepoint to Rust sample
  rust: add tracepoint support
  rust: add static_branch_unlikely for static_key_false
This commit is contained in:
Linus Torvalds
2024-11-25 15:44:29 -08:00
parent 36843bfbf7 8af7a50167
commit 7f4f3b14e8
22 changed files with 375 additions and 64 deletions
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include/linux/tracepoint.h
+27 -1
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@@ -239,6 +239,18 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
preempt_enable_notrace(); \
} while (0)
/*
* 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(name, proto, args) \
notrace void rust_do_trace_##name(proto) \
{ \
__rust_do_trace_##name(args); \
}
/*
* Make sure the alignment of the structure in the __tracepoints section will
* not add unwanted padding between the beginning of the section and the
@@ -254,6 +266,7 @@ 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 int \
register_trace_##name(void (*probe)(data_proto), void *data) \
{ \
@@ -285,6 +298,12 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
#define __DECLARE_TRACE(name, proto, args, cond, data_proto) \
__DECLARE_TRACE_COMMON(name, PARAMS(proto), PARAMS(args), cond, PARAMS(data_proto)) \
static inline void __rust_do_trace_##name(proto) \
{ \
__DO_TRACE(name, \
TP_ARGS(args), \
TP_CONDITION(cond), 0); \
} \
static inline void trace_##name(proto) \
{ \
if (static_branch_unlikely(&__tracepoint_##name.key)) \
@@ -299,6 +318,12 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
#define __DECLARE_TRACE_SYSCALL(name, proto, args, cond, data_proto) \
__DECLARE_TRACE_COMMON(name, PARAMS(proto), PARAMS(args), cond, PARAMS(data_proto)) \
static inline void __rust_do_trace_##name(proto) \
{ \
__DO_TRACE(name, \
TP_ARGS(args), \
TP_CONDITION(cond), 1); \
} \
static inline void trace_##name(proto) \
{ \
might_fault(); \
@@ -354,7 +379,8 @@ 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_FN(_name, _reg, _unreg, _proto, _args) \
static struct tracepoint_ext __tracepoint_ext_##_name = { \