2018-05-21 08:54:27 +00:00
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Media device request objects
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*
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* Copyright 2018 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
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* Copyright (C) 2018 Intel Corporation
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*
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* Author: Hans Verkuil <hans.verkuil@cisco.com>
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* Author: Sakari Ailus <sakari.ailus@linux.intel.com>
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*/
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#ifndef MEDIA_REQUEST_H
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#define MEDIA_REQUEST_H
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/refcount.h>
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#include <media/media-device.h>
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/**
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* enum media_request_state - media request state
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*
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* @MEDIA_REQUEST_STATE_IDLE: Idle
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* @MEDIA_REQUEST_STATE_VALIDATING: Validating the request, no state changes
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* allowed
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* @MEDIA_REQUEST_STATE_QUEUED: Queued
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* @MEDIA_REQUEST_STATE_COMPLETE: Completed, the request is done
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* @MEDIA_REQUEST_STATE_CLEANING: Cleaning, the request is being re-inited
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* @MEDIA_REQUEST_STATE_UPDATING: The request is being updated, i.e.
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* request objects are being added,
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* modified or removed
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* @NR_OF_MEDIA_REQUEST_STATE: The number of media request states, used
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* internally for sanity check purposes
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*/
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enum media_request_state {
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MEDIA_REQUEST_STATE_IDLE,
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MEDIA_REQUEST_STATE_VALIDATING,
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MEDIA_REQUEST_STATE_QUEUED,
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MEDIA_REQUEST_STATE_COMPLETE,
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MEDIA_REQUEST_STATE_CLEANING,
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MEDIA_REQUEST_STATE_UPDATING,
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NR_OF_MEDIA_REQUEST_STATE,
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};
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struct media_request_object;
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/**
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* struct media_request - Media device request
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* @mdev: Media device this request belongs to
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* @kref: Reference count
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* @debug_str: Prefix for debug messages (process name:fd)
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* @state: The state of the request
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* @updating_count: count the number of request updates that are in progress
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2018-08-27 15:10:38 +00:00
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* @access_count: count the number of request accesses that are in progress
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2018-05-21 08:54:27 +00:00
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* @objects: List of @struct media_request_object request objects
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* @num_incomplete_objects: The number of incomplete objects in the request
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* @poll_wait: Wait queue for poll
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* @lock: Serializes access to this struct
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*/
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struct media_request {
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struct media_device *mdev;
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struct kref kref;
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char debug_str[TASK_COMM_LEN + 11];
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enum media_request_state state;
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unsigned int updating_count;
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2018-08-27 15:10:38 +00:00
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unsigned int access_count;
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2018-05-21 08:54:27 +00:00
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struct list_head objects;
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unsigned int num_incomplete_objects;
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2018-11-09 21:06:05 +00:00
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wait_queue_head_t poll_wait;
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2018-05-21 08:54:27 +00:00
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spinlock_t lock;
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};
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#ifdef CONFIG_MEDIA_CONTROLLER
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2018-08-27 15:10:38 +00:00
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/**
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* media_request_lock_for_access - Lock the request to access its objects
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*
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* @req: The media request
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*
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* Use before accessing a completed request. A reference to the request must
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* be held during the access. This usually takes place automatically through
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* a file handle. Use @media_request_unlock_for_access when done.
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*/
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static inline int __must_check
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media_request_lock_for_access(struct media_request *req)
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{
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unsigned long flags;
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int ret = -EBUSY;
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spin_lock_irqsave(&req->lock, flags);
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if (req->state == MEDIA_REQUEST_STATE_COMPLETE) {
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req->access_count++;
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ret = 0;
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}
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spin_unlock_irqrestore(&req->lock, flags);
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return ret;
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}
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/**
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* media_request_unlock_for_access - Unlock a request previously locked for
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* access
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*
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* @req: The media request
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*
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* Unlock a request that has previously been locked using
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* @media_request_lock_for_access.
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*/
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static inline void media_request_unlock_for_access(struct media_request *req)
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{
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unsigned long flags;
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spin_lock_irqsave(&req->lock, flags);
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if (!WARN_ON(!req->access_count))
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req->access_count--;
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spin_unlock_irqrestore(&req->lock, flags);
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}
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2018-05-21 08:54:27 +00:00
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/**
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* media_request_lock_for_update - Lock the request for updating its objects
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*
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* @req: The media request
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*
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* Use before updating a request, i.e. adding, modifying or removing a request
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* object in it. A reference to the request must be held during the update. This
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* usually takes place automatically through a file handle. Use
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* @media_request_unlock_for_update when done.
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*/
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static inline int __must_check
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media_request_lock_for_update(struct media_request *req)
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{
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unsigned long flags;
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int ret = 0;
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spin_lock_irqsave(&req->lock, flags);
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if (req->state == MEDIA_REQUEST_STATE_IDLE ||
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req->state == MEDIA_REQUEST_STATE_UPDATING) {
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req->state = MEDIA_REQUEST_STATE_UPDATING;
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req->updating_count++;
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} else {
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ret = -EBUSY;
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}
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spin_unlock_irqrestore(&req->lock, flags);
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return ret;
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}
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/**
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* media_request_unlock_for_update - Unlock a request previously locked for
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* update
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*
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* @req: The media request
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*
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* Unlock a request that has previously been locked using
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* @media_request_lock_for_update.
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*/
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static inline void media_request_unlock_for_update(struct media_request *req)
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{
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unsigned long flags;
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spin_lock_irqsave(&req->lock, flags);
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WARN_ON(req->updating_count <= 0);
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if (!--req->updating_count)
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req->state = MEDIA_REQUEST_STATE_IDLE;
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spin_unlock_irqrestore(&req->lock, flags);
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}
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/**
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* media_request_get - Get the media request
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*
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* @req: The media request
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*
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* Get the media request.
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*/
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static inline void media_request_get(struct media_request *req)
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{
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kref_get(&req->kref);
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}
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/**
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* media_request_put - Put the media request
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*
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* @req: The media request
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*
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* Put the media request. The media request will be released
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* when the refcount reaches 0.
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*/
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void media_request_put(struct media_request *req);
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2018-05-21 08:54:28 +00:00
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/**
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* media_request_get_by_fd - Get a media request by fd
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*
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* @mdev: Media device this request belongs to
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* @request_fd: The file descriptor of the request
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*
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* Get the request represented by @request_fd that is owned
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* by the media device.
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*
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2019-03-20 14:31:18 +00:00
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* Return a -EBADR error pointer if requests are not supported
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2018-08-23 10:14:12 +00:00
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* by this driver. Return -EINVAL if the request was not found.
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2018-05-21 08:54:28 +00:00
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* Return the pointer to the request if found: the caller will
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* have to call @media_request_put when it finished using the
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* request.
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*/
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struct media_request *
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media_request_get_by_fd(struct media_device *mdev, int request_fd);
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2018-05-21 08:54:27 +00:00
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/**
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* media_request_alloc - Allocate the media request
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*
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* @mdev: Media device this request belongs to
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* @alloc_fd: Store the request's file descriptor in this int
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*
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* Allocated the media request and put the fd in @alloc_fd.
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*/
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int media_request_alloc(struct media_device *mdev,
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int *alloc_fd);
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#else
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static inline void media_request_get(struct media_request *req)
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{
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}
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static inline void media_request_put(struct media_request *req)
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{
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}
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2018-05-21 08:54:28 +00:00
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static inline struct media_request *
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media_request_get_by_fd(struct media_device *mdev, int request_fd)
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{
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2019-03-20 14:31:18 +00:00
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return ERR_PTR(-EBADR);
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2018-05-21 08:54:28 +00:00
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}
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2018-05-21 08:54:27 +00:00
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#endif
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/**
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* struct media_request_object_ops - Media request object operations
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* @prepare: Validate and prepare the request object, optional.
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* @unprepare: Unprepare the request object, optional.
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* @queue: Queue the request object, optional.
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* @unbind: Unbind the request object, optional.
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* @release: Release the request object, required.
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*/
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struct media_request_object_ops {
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int (*prepare)(struct media_request_object *object);
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void (*unprepare)(struct media_request_object *object);
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void (*queue)(struct media_request_object *object);
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void (*unbind)(struct media_request_object *object);
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void (*release)(struct media_request_object *object);
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};
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/**
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* struct media_request_object - An opaque object that belongs to a media
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* request
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*
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* @ops: object's operations
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* @priv: object's priv pointer
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* @req: the request this object belongs to (can be NULL)
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* @list: List entry of the object for @struct media_request
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* @kref: Reference count of the object, acquire before releasing req->lock
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* @completed: If true, then this object was completed.
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*
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* An object related to the request. This struct is always embedded in
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* another struct that contains the actual data for this request object.
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*/
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struct media_request_object {
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const struct media_request_object_ops *ops;
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void *priv;
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struct media_request *req;
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struct list_head list;
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struct kref kref;
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bool completed;
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};
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#ifdef CONFIG_MEDIA_CONTROLLER
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/**
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* media_request_object_get - Get a media request object
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*
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* @obj: The object
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*
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* Get a media request object.
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*/
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static inline void media_request_object_get(struct media_request_object *obj)
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{
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kref_get(&obj->kref);
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}
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/**
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* media_request_object_put - Put a media request object
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*
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* @obj: The object
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*
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* Put a media request object. Once all references are gone, the
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* object's memory is released.
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*/
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void media_request_object_put(struct media_request_object *obj);
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2018-05-21 08:54:29 +00:00
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/**
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* media_request_object_find - Find an object in a request
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*
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* @req: The media request
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* @ops: Find an object with this ops value
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* @priv: Find an object with this priv value
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*
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* Both @ops and @priv must be non-NULL.
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*
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* Returns the object pointer or NULL if not found. The caller must
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* call media_request_object_put() once it finished using the object.
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*
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* Since this function needs to walk the list of objects it takes
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* the @req->lock spin lock to make this safe.
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*/
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struct media_request_object *
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media_request_object_find(struct media_request *req,
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const struct media_request_object_ops *ops,
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void *priv);
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2018-05-21 08:54:27 +00:00
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/**
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* media_request_object_init - Initialise a media request object
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*
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* @obj: The object
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*
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* Initialise a media request object. The object will be released using the
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* release callback of the ops once it has no references (this function
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* initialises references to one).
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*/
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void media_request_object_init(struct media_request_object *obj);
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/**
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* media_request_object_bind - Bind a media request object to a request
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*
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* @req: The media request
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* @ops: The object ops for this object
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* @priv: A driver-specific priv pointer associated with this object
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* @is_buffer: Set to true if the object a buffer object.
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* @obj: The object
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*
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* Bind this object to the request and set the ops and priv values of
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* the object so it can be found later with media_request_object_find().
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*
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* Every bound object must be unbound or completed by the kernel at some
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* point in time, otherwise the request will never complete. When the
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* request is released all completed objects will be unbound by the
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* request core code.
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*
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* Buffer objects will be added to the end of the request's object
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* list, non-buffer objects will be added to the front of the list.
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* This ensures that all buffer objects are at the end of the list
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* and that all non-buffer objects that they depend on are processed
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* first.
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*/
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int media_request_object_bind(struct media_request *req,
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const struct media_request_object_ops *ops,
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void *priv, bool is_buffer,
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struct media_request_object *obj);
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/**
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* media_request_object_unbind - Unbind a media request object
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*
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* @obj: The object
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*
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* Unbind the media request object from the request.
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*/
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void media_request_object_unbind(struct media_request_object *obj);
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/**
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* media_request_object_complete - Mark the media request object as complete
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*
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* @obj: The object
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*
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* Mark the media request object as complete. Only bound objects can
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* be completed.
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*/
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void media_request_object_complete(struct media_request_object *obj);
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#else
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2018-08-27 15:10:38 +00:00
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static inline int __must_check
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media_request_lock_for_access(struct media_request *req)
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{
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return -EINVAL;
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}
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static inline void media_request_unlock_for_access(struct media_request *req)
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{
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}
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2018-05-21 08:54:27 +00:00
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static inline int __must_check
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media_request_lock_for_update(struct media_request *req)
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{
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return -EINVAL;
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}
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static inline void media_request_unlock_for_update(struct media_request *req)
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{
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}
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static inline void media_request_object_get(struct media_request_object *obj)
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{
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}
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static inline void media_request_object_put(struct media_request_object *obj)
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{
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}
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2018-05-21 08:54:29 +00:00
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static inline struct media_request_object *
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media_request_object_find(struct media_request *req,
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const struct media_request_object_ops *ops,
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|
void *priv)
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{
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return NULL;
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}
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|
2018-05-21 08:54:27 +00:00
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static inline void media_request_object_init(struct media_request_object *obj)
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|
{
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|
obj->ops = NULL;
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|
obj->req = NULL;
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|
}
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static inline int media_request_object_bind(struct media_request *req,
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|
|
const struct media_request_object_ops *ops,
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|
|
void *priv, bool is_buffer,
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|
|
struct media_request_object *obj)
|
|
|
|
{
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|
return 0;
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|
}
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static inline void media_request_object_unbind(struct media_request_object *obj)
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|
{
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|
}
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static inline void media_request_object_complete(struct media_request_object *obj)
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|
{
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}
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#endif
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#endif
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