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>

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index edfa15d39d6f12dbf033fc28b64cb082260df20a..8c99ceaa303bad8751571a337770df857e72d981 100644 (file)
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -3014,6 +3014,8 @@ static void binder_netlink_report(struct binder_proc *proc,
                                BINDER_NLGRP_REPORT))
                return;
 
+       trace_binder_netlink_report(context, t, data_size, error);
+
        skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
        if (!skb)
                return;

diff --git a/drivers/android/binder_trace.h b/drivers/android/binder_trace.h
index 97a78e5623db19aa625f8c28ae79173994fa12a4..fa5eb61cf5805c77ec4424f031a1a9b5e9a8264e 100644 (file)
--- a/drivers/android/binder_trace.h
+++ b/drivers/android/binder_trace.h
@@ -402,6 +402,43 @@ TRACE_EVENT(binder_return,
                          "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 */
 
 #undef TRACE_INCLUDE_PATH