Commit 1e9efe6c authored by Kishon Vijay Abraham I's avatar Kishon Vijay Abraham I Committed by Lorenzo Pieralisi
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PCI: endpoint: Add helper to get first unreserved BAR 



Add a helper function pci_epc_get_first_free_bar() to get the first
unreserved BAR that can be used for endpoint function.

Tested-by: default avatarGustavo Pimentel <gustavo.pimentel@synopsys.com>
Signed-off-by: default avatarKishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
parent 67c777e6

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

+23 −0
Original line number Diff line number Diff line
@@ -83,6 +83,29 @@ struct pci_epc *pci_epc_get(const char *epc_name) 
}

EXPORT_SYMBOL_GPL(pci_epc_get);



/**

 * pci_epc_get_first_free_bar() - helper to get first unreserved BAR

 * @epc_features: pci_epc_features structure that holds the reserved bar bitmap

 *

 * Invoke to get the first unreserved BAR that can be used for endpoint

 * function. For any incorrect value in reserved_bar return '0'.

 */

unsigned int pci_epc_get_first_free_bar(const struct pci_epc_features

					*epc_features)

{

	int free_bar;



	if (!epc_features)

		return 0;



	free_bar = ffz(epc_features->reserved_bar);

	if (free_bar > 5)

		return 0;



	return free_bar;

}

EXPORT_SYMBOL_GPL(pci_epc_get_first_free_bar);



/**

 * pci_epc_get_features() - get the features supported by EPC

 * @epc: the features supported by *this* EPC device will be returned

include/linux/pci-epc.h

+2 −0
Original line number Diff line number Diff line
@@ -180,6 +180,8 @@ int pci_epc_start(struct pci_epc *epc); 
void pci_epc_stop(struct pci_epc *epc);

const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc,

						    u8 func_no);

unsigned int pci_epc_get_first_free_bar(const struct pci_epc_features

					*epc_features);

struct pci_epc *pci_epc_get(const char *epc_name);

void pci_epc_put(struct pci_epc *epc);