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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: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
This commit is contained in:
Kishon Vijay Abraham I 2019-01-14 16:45:05 +05:30 committed by Lorenzo Pieralisi
parent 67c777e601
commit 1e9efe6c99
2 changed files with 25 additions and 0 deletions
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23
drivers/pci/endpoint/pci-epc-core.c
View File

@ -83,6 +83,29 @@ err:
}
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

2
include/linux/pci-epc.h
View File

@ -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);