rust_binder: add fd translation tracepoints

Add Rust Binder tracepoint declarations for both `transaction_fd_send`
and `transaction_fd_recv`. Also, wire in the corresponding trace calls
where fd objects are serialised/deserialised.

Signed-off-by: Mohamad Alsadhan <mo@sdhn.cc>
Link: https://patch.msgid.link/20260317-rust-binder-trace-v3-5-6fae4fbcf637@sdhn.cc
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/android/binder/trace.rs b/drivers/android/binder/trace.rs
index d96afdb79c65..c6f39d83314e 100644
--- a/drivers/android/binder/trace.rs
+++ b/drivers/android/binder/trace.rs
@@ -18,6 +18,8 @@ declare_trace! {
     unsafe fn binder_wait_for_work(proc_work: bool, transaction_stack: bool, thread_todo: bool);
     unsafe fn binder_transaction(reply: bool, t: rust_binder_transaction, thread: *mut task_struct);
     unsafe fn binder_transaction_received(t: rust_binder_transaction);
+    unsafe fn binder_transaction_fd_send(t_debug_id: c_int, fd: c_int, offset: usize);
+    unsafe fn binder_transaction_fd_recv(t_debug_id: c_int, fd: c_int, offset: usize);
 }
 
 #[inline]
@@ -77,3 +79,14 @@ pub(crate) fn trace_transaction_received(t: &Transaction) {
     // SAFETY: The raw transaction is valid for the duration of this call.
     unsafe { binder_transaction_received(raw_transaction(t)) }
 }
+
+#[inline]
+pub(crate) fn trace_transaction_fd_send(t_debug_id: usize, fd: u32, offset: usize) {
+    // SAFETY: This function is always safe to call.
+    unsafe { binder_transaction_fd_send(t_debug_id as c_int, fd as c_int, offset) }
+}
+#[inline]
+pub(crate) fn trace_transaction_fd_recv(t_debug_id: usize, fd: u32, offset: usize) {
+    // SAFETY: This function is always safe to call.
+    unsafe { binder_transaction_fd_recv(t_debug_id as c_int, fd as c_int, offset) }
+}