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authorKishon Vijay Abraham I <kishon@ti.com>2019-01-14 16:44:59 +0530
committerLorenzo Pieralisi <lorenzo.pieralisi@arm.com>2019-02-14 16:08:10 +0000
commit41cb8d189c9d4964df52a6f497cab7b301ae831b (patch)
tree4cdd410aedc140e4d2d92366db67a68b9a273be5 /drivers/pci/endpoint
parent726dabfde6aa35a4f1508e235ae37edbbf9fbc65 (diff)
downloadlinux-41cb8d189c9d4964df52a6f497cab7b301ae831b.tar.bz2
PCI: endpoint: Add new pci_epc_ops to get EPC features
Add a new pci_epc_ops ->get_features() to get the features supported by the EPC. Since EPC can provide different features to different functions, the ->get_features() ops takes _func_no_ as an argument. 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>
Diffstat (limited to 'drivers/pci/endpoint')
-rw-r--r--drivers/pci/endpoint/pci-epc-core.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index 094dcc3203b8..5a099479d9ab 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -84,6 +84,36 @@ err:
EXPORT_SYMBOL_GPL(pci_epc_get);
/**
+ * pci_epc_get_features() - get the features supported by EPC
+ * @epc: the features supported by *this* EPC device will be returned
+ * @func_no: the features supported by the EPC device specific to the
+ * endpoint function with func_no will be returned
+ *
+ * Invoke to get the features provided by the EPC which may be
+ * specific to an endpoint function. Returns pci_epc_features on success
+ * and NULL for any failures.
+ */
+const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc,
+ u8 func_no)
+{
+ const struct pci_epc_features *epc_features;
+ unsigned long flags;
+
+ if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
+ return NULL;
+
+ if (!epc->ops->get_features)
+ return NULL;
+
+ spin_lock_irqsave(&epc->lock, flags);
+ epc_features = epc->ops->get_features(epc, func_no);
+ spin_unlock_irqrestore(&epc->lock, flags);
+
+ return epc_features;
+}
+EXPORT_SYMBOL_GPL(pci_epc_get_features);
+
+/**
* pci_epc_stop() - stop the PCI link
* @epc: the link of the EPC device that has to be stopped
*