linux-kernel - [PATCH] PCI: endpoint: Create configfs entry for each pci_epf_device

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Date:   Mon, 2 Apr 2018 18:59:35 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     <kishon@...com>, Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
CC:     <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>
Subject: [PATCH] PCI: endpoint: Create configfs entry for each pci_epf_device_id table entry

In order to be able to provide correct driver_data for pci_epf device,
a separate configfs entry for each pci_epf_device_id table entry in
pci_epf_driver is required.

Add support to create configfs entry for each pci_epf_device_id
table entry here.

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 drivers/pci/endpoint/pci-epf-core.c | 23 +++++++++++++++++++++--
 include/linux/pci-epf.h             |  4 ++--
 2 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/endpoint/pci-epf-core.c b/drivers/pci/endpoint/pci-epf-core.c
index 59ed29e550e9..d6787f39fd41 100644
--- a/drivers/pci/endpoint/pci-epf-core.c
+++ b/drivers/pci/endpoint/pci-epf-core.c
@@ -15,6 +15,8 @@
 #include <linux/pci-epf.h>
 #include <linux/pci-ep-cfs.h>
 
+static DEFINE_MUTEX(pci_epf_mutex);
+
 static struct bus_type pci_epf_bus_type;
 static const struct device_type pci_epf_type;
 
@@ -139,7 +141,13 @@ 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);
+	struct config_group *group;
+
+	mutex_lock(&pci_epf_mutex);
+	list_for_each_entry(group, &driver->epf_group, group_entry)
+		pci_ep_cfs_remove_epf_group(group);
+	list_del(&driver->epf_group);
+	mutex_unlock(&pci_epf_mutex);
 	driver_unregister(&driver->driver);
 }
 EXPORT_SYMBOL_GPL(pci_epf_unregister_driver);
@@ -155,6 +163,8 @@ int __pci_epf_register_driver(struct pci_epf_driver *driver,
 			      struct module *owner)
 {
 	int ret;
+	struct config_group *group;
+	const struct pci_epf_device_id *id;
 
 	if (!driver->ops)
 		return -EINVAL;
@@ -169,7 +179,16 @@ 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);
+	INIT_LIST_HEAD(&driver->epf_group);
+
+	id = driver->id_table;
+	while (id->name[0]) {
+		group = pci_ep_cfs_add_epf_group(id->name);
+		mutex_lock(&pci_epf_mutex);
+		list_add_tail(&group->group_entry, &driver->epf_group);
+		mutex_unlock(&pci_epf_mutex);
+		id++;
+	}
 
 	return 0;
 }
diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h
index e897bf076701..a30dcaafa6e8 100644
--- a/include/linux/pci-epf.h
+++ b/include/linux/pci-epf.h
@@ -72,7 +72,7 @@ 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
+ * @epf_group: list of configfs group corresponding to the PCI EPF driver
  * @id_table: identifies EPF devices for probing
  */
 struct pci_epf_driver {
@@ -82,7 +82,7 @@ struct pci_epf_driver {
 	struct device_driver	driver;
 	struct pci_epf_ops	*ops;
 	struct module		*owner;
-	struct config_group	*group;
+	struct list_head	epf_group;
 	const struct pci_epf_device_id	*id_table;
 };
 
-- 
2.16.2