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Usage: -- 2.25.1 ====== EPC --- ``` static irqreturn_t pcie_ep_irq(int irq, void *data) { ... case PCIE_EP_INT_LINK_DOWN: pci_epc_linkdown(epc); break; ... } ``` EPF --- ``` static int pci_epf_notifier(struct notifier_block *nb, unsigned long val, void *data) { ... case LINK_DOWN: /* Handle link down event */ break; ... } ``` Signed-off-by: Manivannan Sadhasivam --- drivers/pci/endpoint/pci-epc-core.c | 17 +++++++++++++++++ include/linux/pci-epc.h | 1 + include/linux/pci-epf.h | 1 + 3 files changed, 19 insertions(+) diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c index adec9bee72cf..f29d78c18438 100644 --- a/drivers/pci/endpoint/pci-epc-core.c +++ b/drivers/pci/endpoint/pci-epc-core.c @@ -641,6 +641,23 @@ void pci_epc_linkup(struct pci_epc *epc) } EXPORT_SYMBOL_GPL(pci_epc_linkup); +/** + * pci_epc_linkdown() - Notify the EPF device that EPC device has dropped the + * connection with the Root Complex. + * @epc: the EPC device which has dropped the link with the host + * + * Invoke to Notify the EPF device that the EPC device has dropped the + * connection with the Root Complex. + */ +void pci_epc_linkdown(struct pci_epc *epc) +{ + if (!epc || IS_ERR(epc)) + return; + + atomic_notifier_call_chain(&epc->notifier, LINK_DOWN, NULL); +} +EXPORT_SYMBOL_GPL(pci_epc_linkdown); + /** * pci_epc_init_notify() - Notify the EPF device that EPC device's core * initialization is completed. diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h index b82c9b100e97..23590efc13e7 100644 --- a/include/linux/pci-epc.h +++ b/include/linux/pci-epc.h @@ -202,6 +202,7 @@ void pci_epc_destroy(struct pci_epc *epc); int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf, enum pci_epc_interface_type type); void pci_epc_linkup(struct pci_epc *epc); +void pci_epc_linkdown(struct pci_epc *epc); void pci_epc_init_notify(struct pci_epc *epc); void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf, enum pci_epc_interface_type type); diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h index 6833e2160ef1..e9ad634b1575 100644 --- a/include/linux/pci-epf.h +++ b/include/linux/pci-epf.h @@ -20,6 +20,7 @@ enum pci_epc_interface_type; enum pci_notify_event { CORE_INIT, LINK_UP, + LINK_DOWN, }; enum pci_barno {