Merge branch 'pci/error'

- Clear AER status of the reporting device (Keith Busch)

- Clear AER status from Root Port when resetting Downstream Port (Keith
  Busch)

- Retain status from error notification (Keith Busch)

- Log the type of Port that was reset for error handling (Keith Busch)

- Report reset for frozen channel (Keith Busch)

* pci/error:
  PCI/portdrv: Report reset for frozen channel
  PCI/AER: Specify the type of Port that was reset
  PCI/ERR: Retain status from error notification
  PCI/AER: Clear AER status from Root Port when resetting Downstream Port
  PCI/ERR: Clear status of the reporting device

drivers/pci/pcie/aer.c

@@ -1388,7 +1388,7 @@ static pci_ers_result_t aer_root_reset(struct pci_dev *dev)
 	if (type == PCI_EXP_TYPE_RC_END)
 		root = dev->rcec;
 	else
-		root = dev;
+		root = pcie_find_root_port(dev);
 
 	/*
 	 * If the platform retained control of AER, an RCiEP may not have
@@ -1414,7 +1414,8 @@ static pci_ers_result_t aer_root_reset(struct pci_dev *dev)
 		}
 	} else {
 		rc = pci_bus_error_reset(dev);
-		pci_info(dev, "Root Port link has been reset (%d)\n", rc);
+		pci_info(dev, "%s Port link has been reset (%d)\n",
+			pci_is_root_bus(dev->bus) ? "Root" : "Downstream", rc);
 	}
 
 	if ((host->native_aer || pcie_ports_native) && aer) {

drivers/pci/pcie/err.c

@@ -198,8 +198,7 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
 	pci_dbg(bridge, "broadcast error_detected message\n");
 	if (state == pci_channel_io_frozen) {
 		pci_walk_bridge(bridge, report_frozen_detected, &status);
-		status = reset_subordinates(bridge);
-		if (status != PCI_ERS_RESULT_RECOVERED) {
+		if (reset_subordinates(bridge) != PCI_ERS_RESULT_RECOVERED) {
 			pci_warn(bridge, "subordinate device reset failed\n");
 			goto failed;
 		}
@@ -231,15 +230,14 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
 	pci_walk_bridge(bridge, report_resume, &status);
 
 	/*
-	 * If we have native control of AER, clear error status in the Root
-	 * Port or Downstream Port that signaled the error.  If the
-	 * platform retained control of AER, it is responsible for clearing
-	 * this status.  In that case, the signaling device may not even be
-	 * visible to the OS.
+	 * If we have native control of AER, clear error status in the device
+	 * that detected the error.  If the platform retained control of AER,
+	 * it is responsible for clearing this status.  In that case, the
+	 * signaling device may not even be visible to the OS.
 	 */
 	if (host->native_aer || pcie_ports_native) {
-		pcie_clear_device_status(bridge);
-		pci_aer_clear_nonfatal_status(bridge);
+		pcie_clear_device_status(dev);
+		pci_aer_clear_nonfatal_status(dev);
 	}
 	pci_info(bridge, "device recovery successful\n");
 	return status;

drivers/pci/pcie/portdrv_pci.c

@@ -153,7 +153,8 @@ static void pcie_portdrv_remove(struct pci_dev *dev)
 static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
 					pci_channel_state_t error)
 {
-	/* Root Port has no impact. Always recovers. */
+	if (error == pci_channel_io_frozen)
+		return PCI_ERS_RESULT_NEED_RESET;
 	return PCI_ERS_RESULT_CAN_RECOVER;
 }