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@linaro.org --- drivers/misc/rpmb-core.c | 155 +++++++++++++++++++-------------------- drivers/tee/tee_core.c | 19 +++-- include/linux/rpmb.h | 53 +++++-------- include/linux/tee_core.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 d52e879b204e..d113679b1e2d 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_core.h b/include/linux/tee_core.h index efd16ed52315..a38494d6b5f4 100644 --- a/include/linux/tee_core.h +++ b/include/linux/tee_core.h @@ -154,6 +154,18 @@ 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