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binder: add tracepoint for netlink reports 

Add a tracepoint to capture the same details that are being sent through
the generic netlink interface during transaction failures. This provides
a useful debugging tool to observe the events independently from the
netlink listeners.

Signed-off-by: Carlos Llamas <cmllamas@google.com>
Link: https://lore.kernel.org/r/20250727182932.2499194-6-cmllamas@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Carlos Llamas 2025-07-27 18:29:08 +00:00 committed by Greg Kroah-Hartman
parent f37b55ded8
commit 8a61a53b07
2 changed files with 39 additions and 0 deletions
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2
drivers/android/binder.c
View File

@ -3014,6 +3014,8 @@ static void binder_netlink_report(struct binder_proc *proc,
BINDER_NLGRP_REPORT)) BINDER_NLGRP_REPORT))
return; return;
trace_binder_netlink_report(context, t, data_size, error);
skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL); skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!skb) if (!skb)
return; return;

37
drivers/android/binder_trace.h
View File

@ -402,6 +402,43 @@ TRACE_EVENT(binder_return,
"unknown") "unknown")
); );
TRACE_EVENT(binder_netlink_report,
TP_PROTO(const char *context,
struct binder_transaction *t,
u32 data_size,
u32 error),
TP_ARGS(context, t, data_size, error),
TP_STRUCT__entry(
__field(const char *, context)
__field(u32, error)
__field(int, from_pid)
__field(int, from_tid)
__field(int, to_pid)
__field(int, to_tid)
__field(bool, is_reply)
__field(unsigned int, flags)
__field(unsigned int, code)
__field(size_t, data_size)
),
TP_fast_assign(
__entry->context = context;
__entry->error = error;
__entry->from_pid = t->from_pid;
__entry->from_tid = t->from_tid;
__entry->to_pid = t->to_proc ? t->to_proc->pid : 0;
__entry->to_tid = t->to_thread ? t->to_thread->pid : 0;
__entry->is_reply = t->is_reply;
__entry->flags = t->flags;
__entry->code = t->code;
__entry->data_size = data_size;
),
TP_printk("from %d:%d to %d:%d context=%s error=%d is_reply=%d flags=0x%x code=0x%x size=%zu",
__entry->from_pid, __entry->from_tid,
__entry->to_pid, __entry->to_tid,
__entry->context, __entry->error, __entry->is_reply,
__entry->flags, __entry->code, __entry->data_size)
);
#endif /* _BINDER_TRACE_H */ #endif /* _BINDER_TRACE_H */
#undef TRACE_INCLUDE_PATH #undef TRACE_INCLUDE_PATH