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Merge tag 'probes-v6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

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Pull probes updates from Masami Hiramatsu:

 - kprobes: use struct_size() for variable size kretprobe_instance data
   structure.

 - eprobe: Simplify trace_eprobe list iteration.

 - probe events: Data structure field access support on BTF argument.

     - Update BTF argument support on the functions in the kernel
       loadable modules (only loaded modules are supported).

     - Move generic BTF access function (search function prototype and
       get function parameters) to a separated file.

     - Add a function to search a member of data structure in BTF.

     - Support accessing BTF data structure member from probe args by
       C-like arrow('->') and dot('.') operators. e.g.
          't sched_switch next=next->pid vruntime=next->se.vruntime'

     - Support accessing BTF data structure member from $retval. e.g.
          'f getname_flags%return +0($retval->name):string'

     - Add string type checking if BTF type info is available. This will
       reject if user specify ":string" type for non "char pointer"
       type.

     - Automatically assume the fprobe event as a function return event
       if $retval is used.

 - selftests/ftrace: Add BTF data field access test cases.

 - Documentation: Update fprobe event example with BTF data field.

* tag 'probes-v6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  Documentation: tracing: Update fprobe event example with BTF field
  selftests/ftrace: Add BTF fields access testcases
  tracing/fprobe-event: Assume fprobe is a return event by $retval
  tracing/probes: Add string type check with BTF
  tracing/probes: Support BTF field access from $retval
  tracing/probes: Support BTF based data structure field access
  tracing/probes: Add a function to search a member of a struct/union
  tracing/probes: Move finding func-proto API and getting func-param API to trace_btf
  tracing/probes: Support BTF argument on module functions
  tracing/eprobe: Iterate trace_eprobe directly
  kernel: kprobes: Use struct_size()
This commit is contained in:
Linus Torvalds
2023-09-02 11:10:50 -07:00
parent e021c5f1f6 a2439a4c90
commit b70100f2e6
16 changed files with 671 additions and 198 deletions
Download Patch File Download Diff File Expand all files Collapse all files
kernel/trace/trace_probe.h
+23 -4
View File
@@ -383,9 +383,15 @@ static inline bool tparg_is_function_entry(unsigned int flags)
struct traceprobe_parse_context {
struct trace_event_call *event;
const struct btf_param *params;
s32 nr_params;
const char *funcname;
/* BTF related parameters */
const char *funcname; /* Function name in BTF */
const struct btf_type *proto; /* Prototype of the function */
const struct btf_param *params; /* Parameter of the function */
s32 nr_params; /* The number of the parameters */
struct btf *btf; /* The BTF to be used */
const struct btf_type *last_type; /* Saved type */
u32 last_bitoffs; /* Saved bitoffs */
u32 last_bitsize; /* Saved bitsize */
unsigned int flags;
int offset;
};
@@ -400,6 +406,12 @@ const char **traceprobe_expand_meta_args(int argc, const char *argv[],
extern int traceprobe_update_arg(struct probe_arg *arg);
extern void traceprobe_free_probe_arg(struct probe_arg *arg);
/*
* If either traceprobe_parse_probe_arg() or traceprobe_expand_meta_args() is called,
* this MUST be called for clean up the context and return a resource.
*/
void traceprobe_finish_parse(struct traceprobe_parse_context *ctx);
extern int traceprobe_split_symbol_offset(char *symbol, long *offset);
int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
char *buf, int offset);
@@ -495,7 +507,14 @@ extern int traceprobe_define_arg_fields(struct trace_event_call *event_call,
C(BAD_VAR_ARGS, "$arg* must be an independent parameter without name etc."),\
C(NOFENTRY_ARGS, "$arg* can be used only on function entry"), \
C(DOUBLE_ARGS, "$arg* can be used only once in the parameters"), \
C(ARGS_2LONG, "$arg* failed because the argument list is too long"),
C(ARGS_2LONG, "$arg* failed because the argument list is too long"), \
C(ARGIDX_2BIG, "$argN index is too big"), \
C(NO_PTR_STRCT, "This is not a pointer to union/structure."), \
C(NOSUP_DAT_ARG, "Non pointer structure/union argument is not supported."),\
C(BAD_HYPHEN, "Failed to parse single hyphen. Forgot '>'?"), \
C(NO_BTF_FIELD, "This field is not found."), \
C(BAD_BTF_TID, "Failed to get BTF type info."),\
C(BAD_TYPE4STR, "This type does not fit for string."),
#undef C
#define C(a, b) TP_ERR_##a