[PATCH v10 0/3] PCI: trace: Add a RAS tracepoint to monitor link speed changes

Shuai Xue
2025-09-20T06:01:28Z

changes since v9:
- add a documentation about PCI tracepoints per Bjorn
- create a dedicated drivers/pci/trace.c that always defines the PCI tracepoints per Steve
- move tracepoint callite into __pcie_update_link_speed() per Lukas and Bjorn

changes since v8:
- rewrite commit log from Bjorn
- move pci_hp_event to a common place (include/trace/events/pci.h) per Ilpo
- rename hotplug event strings per Bjorn and Lukas
- add PCIe link tracepoint per Bjorn, Lukas, and Ilpo

Hotplug events are critical indicators for analyzing hardware health, and
surprise link downs can significantly impact system performance and reliability.
In addition, PCIe link speed degradation directly impacts system performance and
often indicates hardware issues such as faulty devices, physical layer problems,
or configuration errors.

This patch set add PCI hotplug and PCIe link tracepoint to help analyze PCI
hotplug events and PCIe link speed degradation.

Shuai Xue (3):
PCI: trace: Add a generic RAS tracepoint for hotplug event
PCI: trace: Add a RAS tracepoint to monitor link speed changes
Documentation: tracing: Add documentation about PCI tracepoints

Documentation/trace/events-pci.rst | 74 ++++++++++++++++++
drivers/pci/Makefile | 2 +
drivers/pci/hotplug/Makefile | 3 +-
drivers/pci/hotplug/pciehp_ctrl.c | 31 ++++++--
drivers/pci/hotplug/pciehp_hpc.c | 3 +-
drivers/pci/pci.c | 2 +-
drivers/pci/pci.h | 22 +++++-
drivers/pci/pcie/bwctrl.c | 4 +-
drivers/pci/probe.c | 9 ++-
drivers/pci/trace.c | 11 +++
include/linux/pci.h | 1 +
include/trace/events/pci.h | 119 +++++++++++++++++++++++++++++
include/uapi/linux/pci.h | 7 ++
13 files changed, 271 insertions(+), 17 deletions(-)
create mode 100644 Documentation/trace/events-pci.rst
create mode 100644 drivers/pci/trace.c
create mode 100644 include/trace/events/pci.h

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2.39.3