[PATCH v7 3/4] tee: add tee_device_set_dev_groups()
From: Jens Wiklander
Date: Mon May 27 2024 - 08:15:39 EST
Add tee_device_set_dev_groups() to TEE drivers to supply driver specific
attribute groups. The class specific attributes are from now on added
via the tee_class, which currently only consist of implementation_id.
Signed-off-by: Jens Wiklander <jens.wiklander@xxxxxxxxxx>
---
drivers/misc/rpmb-core.c | 155 +++++++++++++++++++--------------------
drivers/tee/tee_core.c | 19 +++--
include/linux/rpmb.h | 53 +++++--------
include/linux/tee_drv.h | 12 +++
4 files changed, 122 insertions(+), 117 deletions(-)
diff --git a/drivers/misc/rpmb-core.c b/drivers/misc/rpmb-core.c
index e42a45debc76..691d7de247f6 100644
--- a/drivers/misc/rpmb-core.c
+++ b/drivers/misc/rpmb-core.c
@@ -12,10 +12,8 @@
#include <linux/rpmb.h>
#include <linux/slab.h>
-static struct list_head rpmb_dev_list;
+static DEFINE_IDA(rpmb_ida);
static DEFINE_MUTEX(rpmb_mutex);
-static struct blocking_notifier_head rpmb_interface =
- BLOCKING_NOTIFIER_INIT(rpmb_interface);
/**
* rpmb_dev_get() - increase rpmb device ref counter
@@ -24,7 +22,7 @@ static struct blocking_notifier_head rpmb_interface =
struct rpmb_dev *rpmb_dev_get(struct rpmb_dev *rdev)
{
if (rdev)
- get_device(rdev->parent_dev);
+ get_device(&rdev->dev);
return rdev;
}
EXPORT_SYMBOL_GPL(rpmb_dev_get);
@@ -36,7 +34,7 @@ EXPORT_SYMBOL_GPL(rpmb_dev_get);
void rpmb_dev_put(struct rpmb_dev *rdev)
{
if (rdev)
- put_device(rdev->parent_dev);
+ put_device(&rdev->dev);
}
EXPORT_SYMBOL_GPL(rpmb_dev_put);
@@ -56,11 +54,27 @@ int rpmb_route_frames(struct rpmb_dev *rdev, u8 *req,
if (!req || !req_len || !rsp || !rsp_len)
return -EINVAL;
- return rdev->descr.route_frames(rdev->parent_dev, req, req_len,
+ return rdev->descr.route_frames(rdev->dev.parent, req, req_len,
rsp, rsp_len);
}
EXPORT_SYMBOL_GPL(rpmb_route_frames);
+static void rpmb_dev_release(struct device *dev)
+{
+ struct rpmb_dev *rdev = to_rpmb_dev(dev);
+
+ mutex_lock(&rpmb_mutex);
+ ida_simple_remove(&rpmb_ida, rdev->id);
+ mutex_unlock(&rpmb_mutex);
+ kfree(rdev->descr.dev_id);
+ kfree(rdev);
+}
+
+static struct class rpmb_class = {
+ .name = "rpmb",
+ .dev_release = rpmb_dev_release,
+};
+
/**
* rpmb_dev_find_device() - return first matching rpmb device
* @data: data for the match function
@@ -79,35 +93,34 @@ EXPORT_SYMBOL_GPL(rpmb_route_frames);
*/
struct rpmb_dev *rpmb_dev_find_device(const void *data,
const struct rpmb_dev *start,
- int (*match)(struct rpmb_dev *rdev,
+ int (*match)(struct device *dev,
const void *data))
{
- struct rpmb_dev *rdev;
- struct list_head *pos;
+ struct device *dev;
+ const struct device *start_dev = NULL;
- mutex_lock(&rpmb_mutex);
if (start)
- pos = start->list_node.next;
- else
- pos = rpmb_dev_list.next;
-
- while (pos != &rpmb_dev_list) {
- rdev = container_of(pos, struct rpmb_dev, list_node);
- if (match(rdev, data)) {
- rpmb_dev_get(rdev);
- goto out;
- }
- pos = pos->next;
- }
- rdev = NULL;
-
-out:
- mutex_unlock(&rpmb_mutex);
+ start_dev = &start->dev;
+ dev = class_find_device(&rpmb_class, start_dev, data, match);
- return rdev;
+ return dev ? to_rpmb_dev(dev) : NULL;
}
EXPORT_SYMBOL_GPL(rpmb_dev_find_device);
+int rpmb_interface_register(struct class_interface *intf)
+{
+ intf->class = &rpmb_class;
+
+ return class_interface_register(intf);
+}
+EXPORT_SYMBOL_GPL(rpmb_interface_register);
+
+void rpmb_interface_unregister(struct class_interface *intf)
+{
+ class_interface_unregister(intf);
+}
+EXPORT_SYMBOL_GPL(rpmb_interface_unregister);
+
/**
* rpmb_dev_unregister() - unregister RPMB partition from the RPMB subsystem
* @rdev: the rpmb device to unregister
@@ -122,11 +135,9 @@ int rpmb_dev_unregister(struct rpmb_dev *rdev)
if (!rdev)
return -EINVAL;
- mutex_lock(&rpmb_mutex);
- list_del(&rdev->list_node);
- mutex_unlock(&rpmb_mutex);
- kfree(rdev->descr.dev_id);
- kfree(rdev);
+ device_del(&rdev->dev);
+
+ rpmb_dev_put(rdev);
return 0;
}
@@ -146,6 +157,7 @@ struct rpmb_dev *rpmb_dev_register(struct device *dev,
struct rpmb_descr *descr)
{
struct rpmb_dev *rdev;
+ int ret;
if (!dev || !descr || !descr->route_frames || !descr->dev_id ||
!descr->dev_id_len)
@@ -158,71 +170,58 @@ struct rpmb_dev *rpmb_dev_register(struct device *dev,
rdev->descr.dev_id = kmemdup(descr->dev_id, descr->dev_id_len,
GFP_KERNEL);
if (!rdev->descr.dev_id) {
- kfree(rdev);
- return ERR_PTR(-ENOMEM);
+ ret = -ENOMEM;
+ goto err_free_rdev;
}
- rdev->parent_dev = dev;
-
- dev_dbg(rdev->parent_dev, "registered device\n");
-
mutex_lock(&rpmb_mutex);
- list_add_tail(&rdev->list_node, &rpmb_dev_list);
- blocking_notifier_call_chain(&rpmb_interface, RPMB_NOTIFY_ADD_DEVICE,
- rdev);
+ ret = ida_simple_get(&rpmb_ida, 0, 0, GFP_KERNEL);
mutex_unlock(&rpmb_mutex);
+ if (ret < 0)
+ goto err_free_dev_id;
+ rdev->id = ret;
- return rdev;
-}
-EXPORT_SYMBOL_GPL(rpmb_dev_register);
+ dev_set_name(&rdev->dev, "rpmb%d", rdev->id);
+ rdev->dev.class = &rpmb_class;
+ rdev->dev.parent = dev;
-/**
- * rpmb_interface_register() - register for new device notifications
- *
- * @nb : New entry in notifier chain
- *
- * Returns: 0 on success -EEXIST on error.
- */
-int rpmb_interface_register(struct notifier_block *nb)
-{
- struct rpmb_dev *rdev;
- int ret;
-
- ret = blocking_notifier_chain_register(&rpmb_interface, nb);
+ ret = device_register(&rdev->dev);
if (ret)
- return ret;
+ goto err_id_remove;
- mutex_lock(&rpmb_mutex);
- list_for_each_entry(rdev, &rpmb_dev_list, list_node)
- nb->notifier_call(nb, RPMB_NOTIFY_ADD_DEVICE, rdev);
- mutex_unlock(&rpmb_mutex);
+ dev_dbg(&rdev->dev, "registered device\n");
- return 0;
-}
-EXPORT_SYMBOL_GPL(rpmb_interface_register);
+ return rdev;
-/**
- * rpmb_interface_unregister() - unregister from new device notifications
- *
- * @nb : Entry to remove from notifier chain
- *
- * Returns: 0 on success or -ENOENT on failure.
- */
-int rpmb_interface_unregister(struct notifier_block *nb)
-{
- return blocking_notifier_chain_unregister(&rpmb_interface, nb);
+err_id_remove:
+ mutex_lock(&rpmb_mutex);
+ ida_simple_remove(&rpmb_ida, rdev->id);
+ mutex_unlock(&rpmb_mutex);
+err_free_dev_id:
+ kfree(rdev->descr.dev_id);
+err_free_rdev:
+ kfree(rdev);
+ return ERR_PTR(ret);
}
-EXPORT_SYMBOL_GPL(rpmb_interface_unregister);
+EXPORT_SYMBOL_GPL(rpmb_dev_register);
static int __init rpmb_init(void)
{
- INIT_LIST_HEAD(&rpmb_dev_list);
+ int ret;
+
+ ret = class_register(&rpmb_class);
+ if (ret) {
+ pr_err("couldn't create class\n");
+ return ret;
+ }
+ ida_init(&rpmb_ida);
return 0;
}
static void __exit rpmb_exit(void)
{
- mutex_destroy(&rpmb_mutex);
+ ida_destroy(&rpmb_ida);
+ class_unregister(&rpmb_class);
}
subsys_initcall(rpmb_init);
diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c
index e59c20d74b36..437d00fa6d4c 100644
--- a/drivers/tee/tee_core.c
+++ b/drivers/tee/tee_core.c
@@ -40,10 +40,7 @@ static const uuid_t tee_client_uuid_ns = UUID_INIT(0x58ac9ca0, 0x2086, 0x4683,
static DECLARE_BITMAP(dev_mask, TEE_NUM_DEVICES);
static DEFINE_SPINLOCK(driver_lock);
-static const struct class tee_class = {
- .name = "tee",
-};
-
+static const struct class tee_class;
static dev_t tee_devt;
struct tee_context *teedev_open(struct tee_device *teedev)
@@ -965,6 +962,13 @@ struct tee_device *tee_device_alloc(const struct tee_desc *teedesc,
}
EXPORT_SYMBOL_GPL(tee_device_alloc);
+void tee_device_set_dev_groups(struct tee_device *teedev,
+ const struct attribute_group **dev_groups)
+{
+ teedev->dev.groups = dev_groups;
+}
+EXPORT_SYMBOL_GPL(tee_device_set_dev_groups);
+
static ssize_t implementation_id_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -983,6 +987,11 @@ static struct attribute *tee_dev_attrs[] = {
ATTRIBUTE_GROUPS(tee_dev);
+static const struct class tee_class = {
+ .name = "tee",
+ .dev_groups = tee_dev_groups,
+};
+
/**
* tee_device_register() - Registers a TEE device
* @teedev: Device to register
@@ -1001,8 +1010,6 @@ int tee_device_register(struct tee_device *teedev)
return -EINVAL;
}
- teedev->dev.groups = tee_dev_groups;
-
rc = cdev_device_add(&teedev->cdev, &teedev->dev);
if (rc) {
dev_err(&teedev->dev,
diff --git a/include/linux/rpmb.h b/include/linux/rpmb.h
index 3ced206fdc17..8fb672ab7b9f 100644
--- a/include/linux/rpmb.h
+++ b/include/linux/rpmb.h
@@ -6,9 +6,8 @@
#ifndef __RPMB_H__
#define __RPMB_H__
-#include <linux/types.h>
#include <linux/device.h>
-#include <linux/notifier.h>
+#include <linux/types.h>
/**
* enum rpmb_type - type of underlying storage technology
@@ -48,38 +47,29 @@ struct rpmb_descr {
/**
* struct rpmb_dev - device which can support RPMB partition
*
- * @parent_dev : parent device
+ * @dev : device
+ * @id : device_id
* @list_node : linked list node
* @descr : RPMB description
*/
struct rpmb_dev {
- struct device *parent_dev;
+ struct device dev;
+ int id;
struct list_head list_node;
struct rpmb_descr descr;
};
-enum rpmb_interface_action {
- RPMB_NOTIFY_ADD_DEVICE,
-};
-
-/**
- * struct rpmb_interface - subscribe to new RPMB devices
- *
- * @list_node : linked list node
- * @add_rdev : notifies that a new RPMB device has been found
- */
-struct rpmb_interface {
- struct list_head list_node;
- void (*add_rdev)(struct rpmb_interface *intf, struct rpmb_dev *rdev);
-};
+#define to_rpmb_dev(x) container_of((x), struct rpmb_dev, dev)
#if IS_ENABLED(CONFIG_RPMB)
struct rpmb_dev *rpmb_dev_get(struct rpmb_dev *rdev);
void rpmb_dev_put(struct rpmb_dev *rdev);
struct rpmb_dev *rpmb_dev_find_device(const void *data,
const struct rpmb_dev *start,
- int (*match)(struct rpmb_dev *rdev,
+ int (*match)(struct device *dev,
const void *data));
+int rpmb_interface_register(struct class_interface *intf);
+void rpmb_interface_unregister(struct class_interface *intf);
struct rpmb_dev *rpmb_dev_register(struct device *dev,
struct rpmb_descr *descr);
int rpmb_dev_unregister(struct rpmb_dev *rdev);
@@ -87,8 +77,6 @@ int rpmb_dev_unregister(struct rpmb_dev *rdev);
int rpmb_route_frames(struct rpmb_dev *rdev, u8 *req,
unsigned int req_len, u8 *resp, unsigned int resp_len);
-int rpmb_interface_register(struct notifier_block *nb);
-int rpmb_interface_unregister(struct notifier_block *nb);
#else
static inline struct rpmb_dev *rpmb_dev_get(struct rpmb_dev *rdev)
{
@@ -99,13 +87,22 @@ static inline void rpmb_dev_put(struct rpmb_dev *rdev) { }
static inline struct rpmb_dev *
rpmb_dev_find_device(const void *data, const struct rpmb_dev *start,
- int (*match)(struct rpmb_dev *rdev, const void *data))
+ int (*match)(struct device *dev, const void *data))
{
return NULL;
}
+static inline int rpmb_interface_register(struct class_interface *intf)
+{
+ return -EOPNOTSUPP;
+}
+
+static inline void rpmb_interface_unregister(struct class_interface *intf)
+{
+}
+
static inline struct rpmb_dev *
-rpmb_dev_register(struct device *dev, const struct rpmb_ops *ops)
+rpmb_dev_register(struct device *dev, struct rpmb_descr *descr)
{
return NULL;
}
@@ -121,16 +118,6 @@ static inline int rpmb_route_frames(struct rpmb_dev *rdev, u8 *req,
{
return -EOPNOTSUPP;
}
-
-static inline int rpmb_interface_register(struct notifier_block *nb)
-{
- return -EOPNOTSUPP;
-}
-
-static inline int rpmb_interface_unregister(struct notifier_block *nb)
-{
- return -EOPNOTSUPP;
-}
#endif /* CONFIG_RPMB */
#endif /* __RPMB_H__ */
diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h
index 71632e3c5f18..c668e51ae939 100644
--- a/include/linux/tee_drv.h
+++ b/include/linux/tee_drv.h
@@ -169,6 +169,18 @@ int tee_device_register(struct tee_device *teedev);
*/
void tee_device_unregister(struct tee_device *teedev);
+/**
+ * tee_device_set_dev_groups() - Set device attribute groups
+ * @teedev: Device to register
+ * @dev_groups: Attribute groups
+ *
+ * Assigns the provided @dev_groups to the @teedev to be registered later
+ * with tee_device_register(). Calling this function is optional, but if
+ * it's called it must be called before tee_device_register().
+ */
+void tee_device_set_dev_groups(struct tee_device *teedev,
+ const struct attribute_group **dev_groups);
+
/**
* tee_session_calc_client_uuid() - Calculates client UUID for session
* @uuid: Resulting UUID
--
2.34.1