Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
rust_binder: add `command`/`return` tracepoints
Add Rust Binder `command` and `return` tracepoint declarations and
wire them in where BC commands are parsed and BR return codes are
emitted to userspace.
Signed-off-by: Mohamad Alsadhan <mo@sdhn.cc>
Link: https://patch.msgid.link/20260317-rust-binder-trace-v3-6-6fae4fbcf637@sdhn.cc
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
authored by
Mohamad Alsadhan
and committed by
Greg Kroah-Hartman
8f348102
25917c05
+47
+32
drivers/android/binder/rust_binder_events.h
+32
drivers/android/binder/rust_binder_events.h
···
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__entry->debug_id, __entry->fd, __entry->offset)
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);
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+
TRACE_EVENT(binder_command,
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+
TP_PROTO(uint32_t cmd),
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TP_ARGS(cmd),
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TP_STRUCT__entry(
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__field(uint32_t, cmd)
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),
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TP_fast_assign(
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__entry->cmd = cmd;
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),
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TP_printk("cmd=0x%x %s",
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__entry->cmd,
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_IOC_NR(__entry->cmd) < ARRAY_SIZE(binder_command_strings) ?
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binder_command_strings[_IOC_NR(__entry->cmd)] :
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"unknown")
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+
);
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+
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+
TRACE_EVENT(binder_return,
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TP_PROTO(uint32_t cmd),
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TP_ARGS(cmd),
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TP_STRUCT__entry(
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__field(uint32_t, cmd)
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),
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TP_fast_assign(
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__entry->cmd = cmd;
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),
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TP_printk("cmd=0x%x %s",
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__entry->cmd,
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_IOC_NR(__entry->cmd) < ARRAY_SIZE(binder_return_strings) ?
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binder_return_strings[_IOC_NR(__entry->cmd)] :
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"unknown")
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+
);
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+
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#endif /* _RUST_BINDER_TRACE_H */
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/* This part must be outside protection */
+1
drivers/android/binder/rust_binder_main.rs
+1
drivers/android/binder/rust_binder_main.rs
···
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/// Write a return code back to user space.
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/// Should be a `BR_` constant from [`defs`] e.g. [`defs::BR_TRANSACTION_COMPLETE`].
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fn write_code(&mut self, code: u32) -> Result {
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crate::trace::trace_return(code);
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stats::GLOBAL_STATS.inc_br(code);
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self.thread.process.stats.inc_br(code);
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self.writer.write(&code)
+1
drivers/android/binder/thread.rs
+1
drivers/android/binder/thread.rs
···
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while reader.len() >= size_of::<u32>() && self.inner.lock().return_work.is_unused() {
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let before = reader.len();
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let cmd = reader.read::<u32>()?;
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+
crate::trace::trace_command(cmd);
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GLOBAL_STATS.inc_bc(cmd);
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self.process.stats.inc_bc(cmd);
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match cmd {
+13
drivers/android/binder/trace.rs
+13
drivers/android/binder/trace.rs
···
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unsafe fn binder_transaction_received(t: rust_binder_transaction);
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unsafe fn binder_transaction_fd_send(t_debug_id: c_int, fd: c_int, offset: usize);
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unsafe fn binder_transaction_fd_recv(t_debug_id: c_int, fd: c_int, offset: usize);
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+
unsafe fn binder_command(cmd: u32);
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+
unsafe fn binder_return(ret: u32);
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}
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#[inline]
···
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pub(crate) fn trace_transaction_fd_recv(t_debug_id: usize, fd: u32, offset: usize) {
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// SAFETY: This function is always safe to call.
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unsafe { binder_transaction_fd_recv(t_debug_id as c_int, fd as c_int, offset) }
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}
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+
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#[inline]
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pub(crate) fn trace_command(cmd: u32) {
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// SAFETY: This function is always safe to call.
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unsafe { binder_command(cmd) }
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}
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#[inline]
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pub(crate) fn trace_return(ret: u32) {
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// SAFETY: This function is always safe to call.
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unsafe { binder_return(ret) }
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}