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| author |   Sven Schnelle <svens@linux.ibm.com> | 2025-02-27 13:58:08 -0500 |
|---|---|---|
| committer |   Steven Rostedt (Google) <rostedt@goodmis.org> | 2025-03-04 11:27:24 -0500 |
| commit | 76fe0337c2199988cb9ed7e41c05d687d95f2e18 (patch) | |
| tree | 2d7a55b407f4c1b7c3cf48f913a98016c3fbbf04 /kernel/trace/trace.c | |
| parent | ftrace: Have funcgraph-args take affect during tracing (diff) | |
| download | wireguard-linux-76fe0337c2199988cb9ed7e41c05d687d95f2e18.tar.xz wireguard-linux-76fe0337c2199988cb9ed7e41c05d687d95f2e18.zip | |
ftrace: Add arguments to function tracer
Wire up the code to print function arguments in the function tracer.
This functionality can be enabled/disabled during runtime with
options/func-args.
ping-689 [004] b.... 77.170220: dummy_xmit(skb = 0x82904800, dev = 0x882d0000) <-dev_hard_start_xmit
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Guo Ren <guoren@kernel.org>
Cc: Donglin Peng <dolinux.peng@gmail.com>
Cc: Zheng Yejian <zhengyejian@huaweicloud.com>
Link: https://lore.kernel.org/20250227185823.154996172@goodmis.org
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Co-developed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace.c')
| -rw-r--r-- | kernel/trace/trace.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 0e6d517e74e0..cb13c88abfd6 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -2878,13 +2878,16 @@ trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer, void trace_function(struct trace_array *tr, unsigned long ip, unsigned long - parent_ip, unsigned int trace_ctx) + parent_ip, unsigned int trace_ctx, struct ftrace_regs *fregs) { struct trace_buffer *buffer = tr->array_buffer.buffer; struct ring_buffer_event *event; struct ftrace_entry *entry; + int size = sizeof(*entry); - event = __trace_buffer_lock_reserve(buffer, TRACE_FN, sizeof(*entry), + size += FTRACE_REGS_MAX_ARGS * !!fregs * sizeof(long); + + event = __trace_buffer_lock_reserve(buffer, TRACE_FN, size, trace_ctx); if (!event) return; @@ -2892,6 +2895,13 @@ trace_function(struct trace_array *tr, unsigned long ip, unsigned long entry->ip = ip; entry->parent_ip = parent_ip; +#ifdef CONFIG_HAVE_FUNCTION_ARG_ACCESS_API + if (fregs) { + for (int i = 0; i < FTRACE_REGS_MAX_ARGS; i++) + entry->args[i] = ftrace_regs_get_argument(fregs, i); + } +#endif + if (static_branch_unlikely(&trace_function_exports_enabled)) ftrace_exports(event, TRACE_EXPORT_FUNCTION); __buffer_unlock_commit(buffer, event); |