Commit a1f6c3d7 authored by Manivannan Sadhasivam's avatar Manivannan Sadhasivam Committed by Bjorn Helgaas
Browse files

PCI: endpoint: Add linkdown notifier support 

Add support to notify the EPF device about the linkdown event from the EPC
device.

Link: https://lore.kernel.org/r/20230602114756.36586-5-manivannan.sadhasivam@linaro.org


Signed-off-by: default avatarManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: default avatarLorenzo Pieralisi <lpieralisi@kernel.org>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: default avatarKishon Vijay Abraham I <kishon@kernel.org>
Reviewed-by: default avatarDamien Le Moal <dlemoal@kernel.org>
parent a504c965

drivers/pci/endpoint/pci-epc-core.c

+26 −0
Original line number Diff line number Diff line
@@ -706,6 +706,32 @@ 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)

{

	struct pci_epf *epf;



	if (!epc || IS_ERR(epc))

		return;



	mutex_lock(&epc->list_lock);

	list_for_each_entry(epf, &epc->pci_epf, list) {

		mutex_lock(&epf->lock);

		if (epf->event_ops && epf->event_ops->link_down)

			epf->event_ops->link_down(epf);

		mutex_unlock(&epf->lock);

	}

	mutex_unlock(&epc->list_lock);

}

EXPORT_SYMBOL_GPL(pci_epc_linkdown);



/**

 * pci_epc_init_notify() - Notify the EPF device that EPC device's core

 *			   initialization is completed.

include/linux/pci-epc.h

+1 −0
Original line number Diff line number Diff line
@@ -203,6 +203,7 @@ 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);

include/linux/pci-epf.h

+2 −0
Original line number Diff line number Diff line
@@ -71,10 +71,12 @@ struct pci_epf_ops { 
 * struct pci_epf_event_ops - Callbacks for capturing the EPC events

 * @core_init: Callback for the EPC initialization complete event

 * @link_up: Callback for the EPC link up event

 * @link_down: Callback for the EPC link down event

 */

struct pci_epc_event_ops {

	int (*core_init)(struct pci_epf *epf);

	int (*link_up)(struct pci_epf *epf);

	int (*link_down)(struct pci_epf *epf);

};



/**