changes since v1: - rewrite commit log per Bjorn - refactor aer_get_device_error_info to reduce duplication per Keith - fix to avoid reporting fatal errors twice for root and downstream ports per Keith The AER driver has historically avoided reading the configuration space of an endpoint or RCiEP that reported a fatal error, considering the link to that device unreliable. Consequently, when a fatal error occurs, the AER and DPC drivers do not report specific error types, resulting in logs like: pcieport 0000:30:03.0: EDR: EDR event received pcieport 0000:30:03.0: DPC: containment event, status:0x0005 source:0x3400 pcieport 0000:30:03.0: DPC: ERR_FATAL detected pcieport 0000:30:03.0: AER: broadcast error_detected message nvme nvme0: frozen state error detected, reset controller nvme 0000:34:00.0: ready 0ms after DPC pcieport 0000:30:03.0: AER: broadcast slot_reset message AER status registers are sticky and Write-1-to-clear. If the link recovered after hot reset, we can still safely access AER status of the error device. In such case, report fatal errors which helps to figure out the error root case. - Patch 1/2 identifies the error device by SOURCE ID register - Patch 2/3 reports the AER status if link recoverd. After this patch set, the logs like: pcieport 0000:30:03.0: EDR: EDR event received pcieport 0000:30:03.0: DPC: containment event, status:0x0005 source:0x3400 pcieport 0000:30:03.0: DPC: ERR_FATAL detected pcieport 0000:30:03.0: AER: broadcast error_detected message nvme nvme0: frozen state error detected, reset controller pcieport 0000:30:03.0: waiting 100 ms for downstream link, after activation nvme 0000:34:00.0: ready 0ms after DPC nvme 0000:34:00.0: PCIe Bus Error: severity=Uncorrectable (Fatal), type=Data Link Layer, (Receiver ID) nvme 0000:34:00.0: device [144d:a804] error status/mask=00000010/00504000 nvme 0000:34:00.0: [ 4] DLP (First) pcieport 0000:30:03.0: AER: broadcast slot_reset message Shuai Xue (2): PCI/DPC: Run recovery on device that detected the error PCI/AER: Report fatal errors of RCiEP and EP if link recoverd drivers/pci/pci.h | 5 +++-- drivers/pci/pcie/aer.c | 11 +++++++---- drivers/pci/pcie/dpc.c | 32 +++++++++++++++++++++++++------- drivers/pci/pcie/edr.c | 35 ++++++++++++++++++----------------- drivers/pci/pcie/err.c | 9 +++++++++ 5 files changed, 62 insertions(+), 30 deletions(-) -- 2.39.3
