Implement error_resume callback in DPC so, after DPC trigger event enumerates the devices beneath. Signed-off-by: Oza Pawandeep <poza@xxxxxxxxxxxxxx> diff --git a/drivers/pci/pcie/pcie-dpc.c b/drivers/pci/pcie/pcie-dpc.c index 0524bd3..382d5c5 100644 --- a/drivers/pci/pcie/pcie-dpc.c +++ b/drivers/pci/pcie/pcie-dpc.c @@ -128,6 +128,23 @@ static void dpc_wait_link_inactive(struct dpc_dev *dpc) } /** + * dpc_error_resume - enumerate the devices beneath + * @dev: pointer to Root Port's pci_dev data structure + * + * Invoked by Port Bus driver during nonfatal recovery. + */ +static void dpc_error_resume(struct pci_dev *pdev) +{ + bool active = true; + + if (pci_wait_for_link(pdev, active)) { + pci_lock_rescan_remove(); + pci_rescan_bus(pdev->bus); + pci_unlock_rescan_remove(); + } +} + +/** * dpc_reset_link - reset link DPC routine * @dev: pointer to Root Port's pci_dev data structure * @@ -365,6 +382,7 @@ static void dpc_remove(struct pcie_device *dev) .service = PCIE_PORT_SERVICE_DPC, .probe = dpc_probe, .remove = dpc_remove, + .error_resume = dpc_error_resume, .reset_link = dpc_reset_link, }; diff --git a/drivers/pci/pcie/pcie-err.c b/drivers/pci/pcie/pcie-err.c index 6844347..d7e2377 100644 --- a/drivers/pci/pcie/pcie-err.c +++ b/drivers/pci/pcie/pcie-err.c @@ -236,6 +236,7 @@ static pci_ers_result_t reset_link(struct pci_dev *dev, int severity) * @state: error state * @error_mesg: message to print * @cb: callback to be broadcasted + * @severity: error severity * * Invoked during error recovery process. Once being invoked, the content * of error severity will be broadcasted to all downstream drivers in a @@ -244,7 +245,8 @@ static pci_ers_result_t reset_link(struct pci_dev *dev, int severity) static pci_ers_result_t broadcast_error_message(struct pci_dev *dev, enum pci_channel_state state, char *error_mesg, - int (*cb)(struct pci_dev *, void *)) + int (*cb)(struct pci_dev *, void *), + int severity) { struct aer_broadcast_data result_data; @@ -256,6 +258,17 @@ static pci_ers_result_t broadcast_error_message(struct pci_dev *dev, result_data.result = PCI_ERS_RESULT_RECOVERED; if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) { + /* If DPC is triggered, call resume error handler + * because, at this point we can safely assume that + * link recovery has happened, this is only handled if + * callback is resume, as this function can be called + * with multiple callbacks. + */ + if ((severity == DPC_FATAL) && + (cb == report_resume)) { + cb(dev, NULL); + return PCI_ERS_RESULT_RECOVERED; + } /* * If the error is reported by a bridge, we think this error * is related to the downstream link of the bridge, so we @@ -305,7 +318,8 @@ void pci_do_recovery(struct pci_dev *dev, int severity) status = broadcast_error_message(dev, state, "error_detected", - report_error_detected); + report_error_detected, + severity); if ((severity == AER_FATAL) || (severity == DPC_FATAL)) { @@ -321,7 +335,8 @@ void pci_do_recovery(struct pci_dev *dev, int severity) status = broadcast_error_message(dev, state, "mmio_enabled", - report_mmio_enabled); + report_mmio_enabled, + severity); if (status == PCI_ERS_RESULT_NEED_RESET) { /* @@ -332,7 +347,8 @@ void pci_do_recovery(struct pci_dev *dev, int severity) status = broadcast_error_message(dev, state, "slot_reset", - report_slot_reset); + report_slot_reset, + severity); } if (status != PCI_ERS_RESULT_RECOVERED) @@ -342,7 +358,8 @@ void pci_do_recovery(struct pci_dev *dev, int severity) broadcast_error_message(dev, state, "resume", - report_resume); + report_resume, + severity); dev_info(&dev->dev, "Device recovery successful\n"); mutex_unlock(&pci_err_recovery_lock); -- Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc., a Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.