PCI: endpoint: Create configfs entry for EPC device and EPF driver

Invoke APIs provided by pci-ep-cfs to create configfs entry for every EPC
device and EPF driver to help users in creating EPF device and binding the
EPF device to the EPC device.
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

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

@@ -24,6 +24,7 @@
 
 #include <linux/pci-epc.h>
 #include <linux/pci-epf.h>
+#include <linux/pci-ep-cfs.h>
 
 static struct class *pci_epc_class;
 
@@ -442,6 +443,7 @@ EXPORT_SYMBOL_GPL(pci_epc_linkup);
  */
 void pci_epc_destroy(struct pci_epc *epc)
 {
+	pci_ep_cfs_remove_epc_group(epc->group);
 	device_unregister(&epc->dev);
 	kfree(epc);
 }
@@ -508,6 +510,8 @@ __pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
 	if (ret)
 		goto put_dev;
 
+	epc->group = pci_ep_cfs_add_epc_group(dev_name(dev));
+
 	return epc;
 
 put_dev:

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

@@ -24,6 +24,7 @@
 
 #include <linux/pci-epc.h>
 #include <linux/pci-epf.h>
+#include <linux/pci-ep-cfs.h>
 
 static struct bus_type pci_epf_bus_type;
 static struct device_type pci_epf_type;
@@ -149,6 +150,7 @@ EXPORT_SYMBOL_GPL(pci_epf_alloc_space);
  */
 void pci_epf_unregister_driver(struct pci_epf_driver *driver)
 {
+	pci_ep_cfs_remove_epf_group(driver->group);
 	driver_unregister(&driver->driver);
 }
 EXPORT_SYMBOL_GPL(pci_epf_unregister_driver);
@@ -178,6 +180,8 @@ int __pci_epf_register_driver(struct pci_epf_driver *driver,
 	if (ret)
 		return ret;
 
+	driver->group = pci_ep_cfs_add_epf_group(driver->driver.name);
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(__pci_epf_register_driver);

include/linux/pci-epc.h

@@ -77,6 +77,7 @@ struct pci_epc_mem {
  * @ops: function pointers for performing endpoint operations
  * @mem: address space of the endpoint controller
  * @max_functions: max number of functions that can be configured in this EPC
+ * @group: configfs group representing the PCI EPC device
  * @lock: spinlock to protect pci_epc ops
  */
 struct pci_epc {
@@ -85,6 +86,7 @@ struct pci_epc {
 	const struct pci_epc_ops	*ops;
 	struct pci_epc_mem		*mem;
 	u8				max_functions;
+	struct config_group		*group;
 	/* spinlock to protect against concurrent access of EP controller */
 	spinlock_t			lock;
 };

include/linux/pci-epf.h

@@ -82,6 +82,7 @@ struct pci_epf_ops {
  * @driver: PCI EPF driver
  * @ops: set of function pointers for performing EPF operations
  * @owner: the owner of the module that registers the PCI EPF driver
+ * @group: configfs group corresponding to the PCI EPF driver
  * @id_table: identifies EPF devices for probing
  */
 struct pci_epf_driver {
@@ -91,6 +92,7 @@ struct pci_epf_driver {
 	struct device_driver	driver;
 	struct pci_epf_ops	*ops;
 	struct module		*owner;
+	struct config_group	*group;
 	const struct pci_epf_device_id	*id_table;
 };