linux-kernel - Re: [PATCH v7] PCI: hotplug: Add a generic RAS tracepoint for hotplug event

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Message-ID: <16fd041f-0c51-4c1f-941d-0906fcc6885c@linux.alibaba.com>
Date: Wed, 7 May 2025 20:03:22 +0800
From: Shuai Xue <xueshuai@...ux.alibaba.com>
To: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: rostedt@...dmis.org, lukas@...ner.de, linux-pci@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-edac@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, helgaas@...nel.org, bhelgaas@...gle.com,
 tony.luck@...el.com, bp@...en8.de, mhiramat@...nel.org,
 mathieu.desnoyers@...icios.com, oleg@...hat.com, naveen@...nel.org,
 davem@...emloft.net, anil.s.keshavamurthy@...el.com, mark.rutland@....com,
 peterz@...radead.org, tianruidong@...ux.alibaba.com
Subject: Re: [PATCH v7] PCI: hotplug: Add a generic RAS tracepoint for hotplug
 event



在 2025/5/7 19:09, Jonathan Cameron 写道:
> On Wed,  7 May 2025 09:15:35 +0800
> Shuai Xue <xueshuai@...ux.alibaba.com> 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@...ner.de>
>> Suggested-by: Steven Rostedt <rostedt@...dmis.org>
>> Reviewed-by: Lukas Wunner <lukas@...ner.de>
>> Signed-off-by: Shuai Xue <xueshuai@...ux.alibaba.com>
> FWIW looks good to me.
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

Thanks :)

> 
> Any userspace tooling planned for this?

Yep, we plan to monitor this tracepoint in rasdaemon after this patch merged.

Best Regards,
Shuai