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: [ 245.281980] pcieport 0000:30:03.0: EDR: EDR event received [ 245.287466] pcieport 0000:30:03.0: DPC: containment event, status:0x0005 source:0x3400 [ 245.295372] pcieport 0000:30:03.0: DPC: ERR_FATAL detected [ 245.300849] pcieport 0000:30:03.0: AER: broadcast error_detected message [ 245.307540] nvme nvme0: frozen state error detected, reset controller [ 245.722582] nvme 0000:34:00.0: ready 0ms after DPC [ 245.727365] pcieport 0000:30:03.0: AER: broadcast slot_reset message But, if the link recovered after hot reset, we can safely access AER status of the error device. In such case, report fatal error 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: [ 414.356755] pcieport 0000:30:03.0: EDR: EDR event received [ 414.362240] pcieport 0000:30:03.0: DPC: containment event, status:0x0005 source:0x3400 [ 414.370148] pcieport 0000:30:03.0: DPC: ERR_FATAL detected [ 414.375642] pcieport 0000:30:03.0: AER: broadcast error_detected message [ 414.382335] nvme nvme0: frozen state error detected, reset controller [ 414.645413] pcieport 0000:30:03.0: waiting 100 ms for downstream link, after activation [ 414.788016] nvme 0000:34:00.0: ready 0ms after DPC [ 414.796975] nvme 0000:34:00.0: PCIe Bus Error: severity=Uncorrectable (Fatal), type=Data Link Layer, (Receiver ID) [ 414.807312] nvme 0000:34:00.0: device [144d:a804] error status/mask=00000010/00504000 [ 414.815305] nvme 0000:34:00.0: [ 4] DLP (First) [ 414.821768] pcieport 0000:30:03.0: AER: broadcast slot_reset message Shuai Xue (2): PCI/AER: run recovery on device that detected the error PCI/AER: report fatal errors of RCiEP and EP if link recoverd drivers/pci/pci.h | 3 ++- drivers/pci/pcie/aer.c | 50 ++++++++++++++++++++++++++++++++++++++++++ drivers/pci/pcie/dpc.c | 30 ++++++++++++++++++++----- drivers/pci/pcie/edr.c | 35 +++++++++++++++-------------- drivers/pci/pcie/err.c | 6 +++++ 5 files changed, 100 insertions(+), 24 deletions(-) -- 2.39.3
