* 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
+ * Invoke to get the first unreserved BAR that can be used by the 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)
{
+ return pci_epc_get_next_free_bar(epc_features, BAR_0);
+}
+EXPORT_SYMBOL_GPL(pci_epc_get_first_free_bar);
+
+/**
+ * pci_epc_get_next_free_bar() - helper to get unreserved BAR starting from @bar
+ * @epc_features: pci_epc_features structure that holds the reserved bar bitmap
+ * @bar: the starting BAR number from where unreserved BAR should be searched
+ *
+ * Invoke to get the next unreserved BAR starting from @bar that can be used
+ * for endpoint function. For any incorrect value in reserved_bar return '0'.
+ */
+unsigned int pci_epc_get_next_free_bar(const struct pci_epc_features
+ *epc_features, enum pci_barno bar)
+{
unsigned long free_bar;
if (!epc_features)
return 0;
+ /* If 'bar - 1' is a 64-bit BAR, move to the next BAR */
+ if ((epc_features->bar_fixed_64bit << 1) & 1 << bar)
+ bar++;
+
/* Find if the reserved BAR is also a 64-bit BAR */
free_bar = epc_features->reserved_bar & epc_features->bar_fixed_64bit;
free_bar <<= 1;
free_bar |= epc_features->reserved_bar;
- /* Now find the free BAR */
- free_bar = ffz(free_bar);
+ free_bar = find_next_zero_bit(&free_bar, 6, bar);
if (free_bar > 5)
return 0;
return free_bar;
}
-EXPORT_SYMBOL_GPL(pci_epc_get_first_free_bar);
+EXPORT_SYMBOL_GPL(pci_epc_get_next_free_bar);
/**
* pci_epc_get_features() - get the features supported by EPC
u8 func_no);
unsigned int pci_epc_get_first_free_bar(const struct pci_epc_features
*epc_features);
+unsigned int pci_epc_get_next_free_bar(const struct pci_epc_features
+ *epc_features, enum pci_barno bar);
struct pci_epc *pci_epc_get(const char *epc_name);
void pci_epc_put(struct pci_epc *epc);