Commit 6360efb9 authored by Manivannan Sadhasivam's avatar Manivannan Sadhasivam Committed by Bjorn Helgaas
Browse files

PCI: endpoint: Add BME notifier support 

Add support to notify the EPF device about the Bus Master Enable (BME)
event received by the EPC device from the Root complex.

Link: https://lore.kernel.org/r/20230602114756.36586-6-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 a1f6c3d7

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

+26 −0
Original line number Diff line number Diff line
@@ -758,6 +758,32 @@ void pci_epc_init_notify(struct pci_epc *epc) 
}

EXPORT_SYMBOL_GPL(pci_epc_init_notify);



/**

 * pci_epc_bme_notify() - Notify the EPF device that the EPC device has received

 *			  the BME event from the Root complex

 * @epc: the EPC device that received the BME event

 *

 * Invoke to Notify the EPF device that the EPC device has received the Bus

 * Master Enable (BME) event from the Root complex

 */

void pci_epc_bme_notify(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->bme)

			epf->event_ops->bme(epf);

		mutex_unlock(&epf->lock);

	}

	mutex_unlock(&epc->list_lock);

}

EXPORT_SYMBOL_GPL(pci_epc_bme_notify);



/**

 * pci_epc_destroy() - destroy the EPC device

 * @epc: the EPC device that has to be destroyed

include/linux/pci-epc.h

+1 −0
Original line number Diff line number Diff line
@@ -205,6 +205,7 @@ int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf, 
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_bme_notify(struct pci_epc *epc);

void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf,

			enum pci_epc_interface_type type);

int pci_epc_write_header(struct pci_epc *epc, u8 func_no, u8 vfunc_no,

include/linux/pci-epf.h

+2 −0
Original line number Diff line number Diff line
@@ -72,11 +72,13 @@ struct pci_epf_ops { 
 * @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

 * @bme: Callback for the EPC BME (Bus Master Enable) 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);

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

};



/**