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PCI: trace: Add generic RAS tracepoint for hotplug event Hotplug events are critical indicators for analyzing hardware health, and surprise link downs can significantly impact system performance and reliability. Define a new TRACING_SYSTEM named "pci", add a generic RAS tracepoint for hotplug event to help health checks. Add enum pci_hotplug_event in include/uapi/linux/pci.h so applications like rasdaemon can register tracepoint event handlers for it. The following output is generated when a device is hotplugged: $ echo 1 > /sys/kernel/debug/tracing/events/pci/pci_hp_event/enable $ cat /sys/kernel/debug/tracing/trace_pipe irq/51-pciehp-88 [001] ..... 1311.177459: pci_hp_event: 0000:00:02.0 slot:10, event:CARD_PRESENT irq/51-pciehp-88 [001] ..... 1311.177566: pci_hp_event: 0000:00:02.0 slot:10, event:LINK_UP Suggested-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Shuai Xue <xueshuai@linux.alibaba.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Lukas Wunner <lukas@wunner.de> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org> # for trace event Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://patch.msgid.link/20251210132907.58799-2-xueshuai@linux.alibaba.com 2025-12-10 21:29:05 +08:00










PCI: trace: Add PCI controller tracepoint feature Some PCI controllers may provide debug functionalities to track PCI bus activities like LTSSM state transitions and data rate changes. These will be very useful for debugging PCI link specific issues such as endpoint not getting detected or performance issues. Hence, implement the PCI controller tracepoint feature for recording LTSSM state transitions and data rate changes. Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> [mani: commit log and maintainers entry] Signed-off-by: Manivannan Sadhasivam <mani@kernel.org> Tested-by: Anand Moon <linux.amoon@gmail.com> Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org> Link: https://patch.msgid.link/1774403912-210670-2-git-send-email-shawn.lin@rock-chips.com 2026-03-25 09:58:30 +08:00