On Wed, 7 May 2025 09:15:35 +0800 Shuai Xue <xueshuai@xxxxxxxxxxxxxxxxx> wrote: > Hotplug events are critical indicators for analyzing hardware health, > particularly in AI supercomputers where surprise link downs can > significantly impact system performance and reliability. > > To this end, define a new TRACING_SYSTEM named pci, add a generic RAS > tracepoint for hotplug event to help healthy check, and generate > tracepoints for pcie hotplug event. Add enum pci_hotplug_event in > include/uapi/linux/pci.h so applications like rasdaemon can register > tracepoint event handlers for it. > > The output like below: > > $ echo 1 > /sys/kernel/debug/tracing/events/pci/pci_hp_event/enable > $ cat /sys/kernel/debug/tracing/trace_pipe > <...>-206 [001] ..... 40.373870: pci_hp_event: 0000:00:02.0 slot:10, event:Link Down > > <...>-206 [001] ..... 40.374871: pci_hp_event: 0000:00:02.0 slot:10, event:Card not present > > Suggested-by: Lukas Wunner <lukas@xxxxxxxxx> > Suggested-by: Steven Rostedt <rostedt@xxxxxxxxxxx> > Reviewed-by: Lukas Wunner <lukas@xxxxxxxxx> > Signed-off-by: Shuai Xue <xueshuai@xxxxxxxxxxxxxxxxx> FWIW looks good to me. Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> Any userspace tooling planned for this?
