On 8/31/2023 12:08 PM, Andy Shevchenko wrote: > Warning: This email is from an unusual correspondent. > Warning: Make sure this is someone you trust. > > On Thu, Aug 24, 2023 at 02:59:01PM -0600, Dan Raymond wrote: >> Implement a UART register tracing facility using the debugfs. This can be >> used as a "serial port sniffer" to monitor UART traffic and line settings >> with timestamps at microsecond granularity. This can be useful for general >> serial port debugging or to debug the UART driver itself. > >> drivers/tty/serial/8250/8250_debug.c | 530 +++++++++++++++++++++++++++ > > My gosh. Why trace points and trace events can't be used for that? > I don't understand your post. Are you saying there is already a way to trace UART register reads/writes without this patch? Can you elaborate?
