[07/15] PCI: endpoint: Add helper to get first unreserved BAR

Commit Message

Kishon Vijay Abraham I Jan. 7, 2019, 6:41 a.m. UTC

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

Signed-off-by: Kishon Vijay Abraham I <[e-mail]>
---
 drivers/pci/endpoint/pci-epc-core.c | 22 ++++++++++++++++++++++
 include/linux/pci-epc.h             |  1 +
 2 files changed, 23 insertions(+)

Patch

diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index 5a099479d9ab..b1632f91e33e 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -83,6 +83,28 @@  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.
+ */
+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 <= 0 || free_bar > 6)
+		return -EINVAL;
+
+	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
diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index 79fbcf94e14d..dc3513a2f88a 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -180,6 +180,7 @@  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);
+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);