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All rights reserved. * Copyright (C) 2018 Intel Corporation * * Author: Hans Verkuil * Author: Sakari Ailus */ #ifndef MEDIA_REQUEST_H #define MEDIA_REQUEST_H #include #include #include #include #include /** * enum media_request_state - media request state * * @MEDIA_REQUEST_STATE_IDLE: Idle * @MEDIA_REQUEST_STATE_VALIDATING: Validating the request, no state changes * allowed * @MEDIA_REQUEST_STATE_QUEUED: Queued * @MEDIA_REQUEST_STATE_COMPLETE: Completed, the request is done * @MEDIA_REQUEST_STATE_CLEANING: Cleaning, the request is being re-inited * @MEDIA_REQUEST_STATE_UPDATING: The request is being updated, i.e. * request objects are being added, * modified or removed * @NR_OF_MEDIA_REQUEST_STATE: The number of media request states, used * internally for sanity check purposes */ enum media_request_state { MEDIA_REQUEST_STATE_IDLE, MEDIA_REQUEST_STATE_VALIDATING, MEDIA_REQUEST_STATE_QUEUED, MEDIA_REQUEST_STATE_COMPLETE, MEDIA_REQUEST_STATE_CLEANING, MEDIA_REQUEST_STATE_UPDATING, NR_OF_MEDIA_REQUEST_STATE, }; struct media_request_object; /** * struct media_request - Media device request * @mdev: Media device this request belongs to * @kref: Reference count * @debug_str: Prefix for debug messages (process name:fd) * @state: The state of the request * @updating_count: count the number of request updates that are in progress * @access_count: count the number of request accesses that are in progress * @objects: List of @struct media_request_object request objects * @num_incomplete_objects: The number of incomplete objects in the request * @poll_wait: Wait queue for poll * @lock: Serializes access to this struct */ struct media_request { struct media_device *mdev; struct kref kref; char debug_str[TASK_COMM_LEN + 11]; enum media_request_state state; unsigned int updating_count; unsigned int access_count; struct list_head objects; unsigned int num_incomplete_objects; wait_queue_head_t poll_wait; spinlock_t lock; }; #ifdef CONFIG_MEDIA_CONTROLLER /** * media_request_lock_for_access - Lock the request to access its objects * * @req: The media request * * Use before accessing a completed request. A reference to the request must * be held during the access. This usually takes place automatically through * a file handle. Use @media_request_unlock_for_access when done. */ static inline int __must_check media_request_lock_for_access(struct media_request *req) { unsigned long flags; int ret = -EBUSY; spin_lock_irqsave(&req->lock, flags); if (req->state == MEDIA_REQUEST_STATE_COMPLETE) { req->access_count++; ret = 0; } spin_unlock_irqrestore(&req->lock, flags); return ret; } /** * media_request_unlock_for_access - Unlock a request previously locked for * access * * @req: The media request * * Unlock a request that has previously been locked using * @media_request_lock_for_access. */ static inline void media_request_unlock_for_access(struct media_request *req) { unsigned long flags; spin_lock_irqsave(&req->lock, flags); if (!WARN_ON(!req->access_count)) req->access_count--; spin_unlock_irqrestore(&req->lock, flags); } /** * media_request_lock_for_update - Lock the request for updating its objects * * @req: The media request * * Use before updating a request, i.e. adding, modifying or removing a request * object in it. A reference to the request must be held during the update. This * usually takes place automatically through a file handle. Use * @media_request_unlock_for_update when done. */ static inline int __must_check media_request_lock_for_update(struct media_request *req) { unsigned long flags; int ret = 0; spin_lock_irqsave(&req->lock, flags); if (req->state == MEDIA_REQUEST_STATE_IDLE || req->state == MEDIA_REQUEST_STATE_UPDATING) { req->state = MEDIA_REQUEST_STATE_UPDATING; req->updating_count++; } else { ret = -EBUSY; } spin_unlock_irqrestore(&req->lock, flags); return ret; } /** * media_request_unlock_for_update - Unlock a request previously locked for * update * * @req: The media request * * Unlock a request that has previously been locked using * @media_request_lock_for_update. */ static inline void media_request_unlock_for_update(struct media_request *req) { unsigned long flags; spin_lock_irqsave(&req->lock, flags); WARN_ON(req->updating_count <= 0); if (!--req->updating_count) req->state = MEDIA_REQUEST_STATE_IDLE; spin_unlock_irqrestore(&req->lock, flags); } /** * media_request_get - Get the media request * * @req: The media request * * Get the media request. */ static inline void media_request_get(struct media_request *req) { kref_get(&req->kref); } /** * media_request_put - Put the media request * * @req: The media request * * Put the media request. The media request will be released * when the refcount reaches 0. */ void media_request_put(struct media_request *req); /** * media_request_get_by_fd - Get a media request by fd * * @mdev: Media device this request belongs to * @request_fd: The file descriptor of the request * * Get the request represented by @request_fd that is owned * by the media device. * * Return a -EBADR error pointer if requests are not supported * by this driver. Return -EINVAL if the request was not found. * Return the pointer to the request if found: the caller will * have to call @media_request_put when it finished using the * request. */ struct media_request * media_request_get_by_fd(struct media_device *mdev, int request_fd); /** * media_request_alloc - Allocate the media request * * @mdev: Media device this request belongs to * @alloc_fd: Store the request's file descriptor in this int * * Allocated the media request and put the fd in @alloc_fd. */ int media_request_alloc(struct media_device *mdev, int *alloc_fd); #else static inline void media_request_get(struct media_request *req) { } static inline void media_request_put(struct media_request *req) { } static inline struct media_request * media_request_get_by_fd(struct media_device *mdev, int request_fd) { return ERR_PTR(-EBADR); } #endif /** * struct media_request_object_ops - Media request object operations * @prepare: Validate and prepare the request object, optional. * @unprepare: Unprepare the request object, optional. * @queue: Queue the request object, optional. * @unbind: Unbind the request object, optional. * @release: Release the request object, required. */ struct media_request_object_ops { int (*prepare)(struct media_request_object *object); void (*unprepare)(struct media_request_object *object); void (*queue)(struct media_request_object *object); void (*unbind)(struct media_request_object *object); void (*release)(struct media_request_object *object); }; /** * struct media_request_object - An opaque object that belongs to a media * request * * @ops: object's operations * @priv: object's priv pointer * @req: the request this object belongs to (can be NULL) * @list: List entry of the object for @struct media_request * @kref: Reference count of the object, acquire before releasing req->lock * @completed: If true, then this object was completed. * * An object related to the request. This struct is always embedded in * another struct that contains the actual data for this request object. */ struct media_request_object { const struct media_request_object_ops *ops; void *priv; struct media_request *req; struct list_head list; struct kref kref; bool completed; }; #ifdef CONFIG_MEDIA_CONTROLLER /** * media_request_object_get - Get a media request object * * @obj: The object * * Get a media request object. */ static inline void media_request_object_get(struct media_request_object *obj) { kref_get(&obj->kref); } /** * media_request_object_put - Put a media request object * * @obj: The object * * Put a media request object. Once all references are gone, the * object's memory is released. */ void media_request_object_put(struct media_request_object *obj); /** * media_request_object_find - Find an object in a request * * @req: The media request * @ops: Find an object with this ops value * @priv: Find an object with this priv value * * Both @ops and @priv must be non-NULL. * * Returns the object pointer or NULL if not found. The caller must * call media_request_object_put() once it finished using the object. * * Since this function needs to walk the list of objects it takes * the @req->lock spin lock to make this safe. */ struct media_request_object * media_request_object_find(struct media_request *req, const struct media_request_object_ops *ops, void *priv); /** * media_request_object_init - Initialise a media request object * * @obj: The object * * Initialise a media request object. The object will be released using the * release callback of the ops once it has no references (this function * initialises references to one). */ void media_request_object_init(struct media_request_object *obj); /** * media_request_object_bind - Bind a media request object to a request * * @req: The media request * @ops: The object ops for this object * @priv: A driver-specific priv pointer associated with this object * @is_buffer: Set to true if the object a buffer object. * @obj: The object * * Bind this object to the request and set the ops and priv values of * the object so it can be found later with media_request_object_find(). * * Every bound object must be unbound or completed by the kernel at some * point in time, otherwise the request will never complete. When the * request is released all completed objects will be unbound by the * request core code. * * Buffer objects will be added to the end of the request's object * list, non-buffer objects will be added to the front of the list. * This ensures that all buffer objects are at the end of the list * and that all non-buffer objects that they depend on are processed * first. */ int media_request_object_bind(struct media_request *req, const struct media_request_object_ops *ops, void *priv, bool is_buffer, struct media_request_object *obj); /** * media_request_object_unbind - Unbind a media request object * * @obj: The object * * Unbind the media request object from the request. */ void media_request_object_unbind(struct media_request_object *obj); /** * media_request_object_complete - Mark the media request object as complete * * @obj: The object * * Mark the media request object as complete. Only bound objects can * be completed. */ void media_request_object_complete(struct media_request_object *obj); #else static inline int __must_check media_request_lock_for_access(struct media_request *req) { return -EINVAL; } static inline void media_request_unlock_for_access(struct media_request *req) { } static inline int __must_check media_request_lock_for_update(struct media_request *req) { return -EINVAL; } static inline void media_request_unlock_for_update(struct media_request *req) { } static inline void media_request_object_get(struct media_request_object *obj) { } static inline void media_request_object_put(struct media_request_object *obj) { } static inline struct media_request_object * media_request_object_find(struct media_request *req, const struct media_request_object_ops *ops, void *priv) { return NULL; } static inline void media_request_object_init(struct media_request_object *obj) { obj->ops = NULL; obj->req = NULL; } static inline int media_request_object_bind(struct media_request *req, const struct media_request_object_ops *ops, void *priv, bool is_buffer, struct media_request_object *obj) { return 0; } static inline void media_request_object_unbind(struct media_request_object *obj) { } static inline void media_request_object_complete(struct media_request_object *obj) { } #endif #endif