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![Sakari Ailus](/assets/img/avatar_default.png)
Use the pad flag specifying the pad type instead of a boolean in preparation for internal source pads. Also make the loop variable unsigned. Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
1611 lines
39 KiB
C
1611 lines
39 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Media entity
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*
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* Copyright (C) 2010 Nokia Corporation
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*
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* Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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* Sakari Ailus <sakari.ailus@iki.fi>
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*/
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#include <linux/bitmap.h>
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#include <linux/list.h>
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#include <linux/property.h>
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#include <linux/slab.h>
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#include <media/media-entity.h>
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#include <media/media-device.h>
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static inline const char *intf_type(struct media_interface *intf)
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{
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switch (intf->type) {
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case MEDIA_INTF_T_DVB_FE:
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return "dvb-frontend";
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case MEDIA_INTF_T_DVB_DEMUX:
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return "dvb-demux";
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case MEDIA_INTF_T_DVB_DVR:
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return "dvb-dvr";
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case MEDIA_INTF_T_DVB_CA:
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return "dvb-ca";
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case MEDIA_INTF_T_DVB_NET:
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return "dvb-net";
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case MEDIA_INTF_T_V4L_VIDEO:
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return "v4l-video";
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case MEDIA_INTF_T_V4L_VBI:
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return "v4l-vbi";
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case MEDIA_INTF_T_V4L_RADIO:
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return "v4l-radio";
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case MEDIA_INTF_T_V4L_SUBDEV:
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return "v4l-subdev";
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case MEDIA_INTF_T_V4L_SWRADIO:
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return "v4l-swradio";
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case MEDIA_INTF_T_V4L_TOUCH:
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return "v4l-touch";
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default:
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return "unknown-intf";
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}
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};
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static inline const char *link_type_name(struct media_link *link)
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{
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switch (link->flags & MEDIA_LNK_FL_LINK_TYPE) {
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case MEDIA_LNK_FL_DATA_LINK:
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return "data";
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case MEDIA_LNK_FL_INTERFACE_LINK:
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return "interface";
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case MEDIA_LNK_FL_ANCILLARY_LINK:
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return "ancillary";
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default:
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return "unknown";
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}
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}
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__must_check int media_entity_enum_init(struct media_entity_enum *ent_enum,
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struct media_device *mdev)
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{
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int idx_max;
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idx_max = ALIGN(mdev->entity_internal_idx_max + 1, BITS_PER_LONG);
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ent_enum->bmap = bitmap_zalloc(idx_max, GFP_KERNEL);
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if (!ent_enum->bmap)
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return -ENOMEM;
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ent_enum->idx_max = idx_max;
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return 0;
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}
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EXPORT_SYMBOL_GPL(media_entity_enum_init);
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void media_entity_enum_cleanup(struct media_entity_enum *ent_enum)
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{
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bitmap_free(ent_enum->bmap);
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}
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EXPORT_SYMBOL_GPL(media_entity_enum_cleanup);
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/**
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* dev_dbg_obj - Prints in debug mode a change on some object
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*
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* @event_name: Name of the event to report. Could be __func__
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* @gobj: Pointer to the object
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*
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* Enabled only if DEBUG or CONFIG_DYNAMIC_DEBUG. Otherwise, it
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* won't produce any code.
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*/
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static void dev_dbg_obj(const char *event_name, struct media_gobj *gobj)
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{
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#if defined(DEBUG) || defined (CONFIG_DYNAMIC_DEBUG)
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switch (media_type(gobj)) {
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case MEDIA_GRAPH_ENTITY:
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dev_dbg(gobj->mdev->dev,
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"%s id %u: entity '%s'\n",
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event_name, media_id(gobj),
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gobj_to_entity(gobj)->name);
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break;
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case MEDIA_GRAPH_LINK:
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{
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struct media_link *link = gobj_to_link(gobj);
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dev_dbg(gobj->mdev->dev,
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"%s id %u: %s link id %u ==> id %u\n",
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event_name, media_id(gobj), link_type_name(link),
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media_id(link->gobj0),
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media_id(link->gobj1));
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break;
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}
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case MEDIA_GRAPH_PAD:
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{
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struct media_pad *pad = gobj_to_pad(gobj);
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dev_dbg(gobj->mdev->dev,
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"%s id %u: %s%spad '%s':%d\n",
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event_name, media_id(gobj),
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pad->flags & MEDIA_PAD_FL_SINK ? "sink " : "",
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pad->flags & MEDIA_PAD_FL_SOURCE ? "source " : "",
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pad->entity->name, pad->index);
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break;
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}
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case MEDIA_GRAPH_INTF_DEVNODE:
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{
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struct media_interface *intf = gobj_to_intf(gobj);
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struct media_intf_devnode *devnode = intf_to_devnode(intf);
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dev_dbg(gobj->mdev->dev,
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"%s id %u: intf_devnode %s - major: %d, minor: %d\n",
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event_name, media_id(gobj),
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intf_type(intf),
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devnode->major, devnode->minor);
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break;
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}
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}
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#endif
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}
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void media_gobj_create(struct media_device *mdev,
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enum media_gobj_type type,
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struct media_gobj *gobj)
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{
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BUG_ON(!mdev);
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gobj->mdev = mdev;
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/* Create a per-type unique object ID */
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gobj->id = media_gobj_gen_id(type, ++mdev->id);
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switch (type) {
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case MEDIA_GRAPH_ENTITY:
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list_add_tail(&gobj->list, &mdev->entities);
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break;
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case MEDIA_GRAPH_PAD:
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list_add_tail(&gobj->list, &mdev->pads);
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break;
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case MEDIA_GRAPH_LINK:
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list_add_tail(&gobj->list, &mdev->links);
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break;
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case MEDIA_GRAPH_INTF_DEVNODE:
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list_add_tail(&gobj->list, &mdev->interfaces);
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break;
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}
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mdev->topology_version++;
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dev_dbg_obj(__func__, gobj);
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}
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void media_gobj_destroy(struct media_gobj *gobj)
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{
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/* Do nothing if the object is not linked. */
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if (gobj->mdev == NULL)
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return;
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dev_dbg_obj(__func__, gobj);
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gobj->mdev->topology_version++;
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/* Remove the object from mdev list */
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list_del(&gobj->list);
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gobj->mdev = NULL;
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}
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/*
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* TODO: Get rid of this.
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*/
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#define MEDIA_ENTITY_MAX_PADS 512
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int media_entity_pads_init(struct media_entity *entity, u16 num_pads,
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struct media_pad *pads)
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{
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struct media_device *mdev = entity->graph_obj.mdev;
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struct media_pad *iter;
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unsigned int i = 0;
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if (num_pads >= MEDIA_ENTITY_MAX_PADS)
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return -E2BIG;
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entity->num_pads = num_pads;
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entity->pads = pads;
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if (mdev)
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mutex_lock(&mdev->graph_mutex);
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media_entity_for_each_pad(entity, iter) {
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iter->entity = entity;
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iter->index = i++;
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if (mdev)
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media_gobj_create(mdev, MEDIA_GRAPH_PAD,
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&iter->graph_obj);
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}
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if (mdev)
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mutex_unlock(&mdev->graph_mutex);
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return 0;
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}
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EXPORT_SYMBOL_GPL(media_entity_pads_init);
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/* -----------------------------------------------------------------------------
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* Graph traversal
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*/
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/**
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* media_entity_has_pad_interdep - Check interdependency between two pads
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*
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* @entity: The entity
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* @pad0: The first pad index
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* @pad1: The second pad index
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*
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* This function checks the interdependency inside the entity between @pad0
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* and @pad1. If two pads are interdependent they are part of the same pipeline
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* and enabling one of the pads means that the other pad will become "locked"
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* and doesn't allow configuration changes.
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*
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* This function uses the &media_entity_operations.has_pad_interdep() operation
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* to check the dependency inside the entity between @pad0 and @pad1. If the
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* has_pad_interdep operation is not implemented, all pads of the entity are
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* considered to be interdependent.
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*
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* One of @pad0 and @pad1 must be a sink pad and the other one a source pad.
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* The function returns false if both pads are sinks or sources.
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*
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* The caller must hold entity->graph_obj.mdev->mutex.
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*
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* Return: true if the pads are connected internally and false otherwise.
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*/
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static bool media_entity_has_pad_interdep(struct media_entity *entity,
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unsigned int pad0, unsigned int pad1)
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{
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if (pad0 >= entity->num_pads || pad1 >= entity->num_pads)
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return false;
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if (entity->pads[pad0].flags & entity->pads[pad1].flags &
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(MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_SOURCE))
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return false;
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if (!entity->ops || !entity->ops->has_pad_interdep)
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return true;
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return entity->ops->has_pad_interdep(entity, pad0, pad1);
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}
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static struct media_entity *
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media_entity_other(struct media_entity *entity, struct media_link *link)
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{
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if (link->source->entity == entity)
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return link->sink->entity;
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else
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return link->source->entity;
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}
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/* push an entity to traversal stack */
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static void stack_push(struct media_graph *graph,
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struct media_entity *entity)
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{
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if (graph->top == MEDIA_ENTITY_ENUM_MAX_DEPTH - 1) {
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WARN_ON(1);
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return;
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}
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graph->top++;
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graph->stack[graph->top].link = entity->links.next;
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graph->stack[graph->top].entity = entity;
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}
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static struct media_entity *stack_pop(struct media_graph *graph)
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{
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struct media_entity *entity;
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entity = graph->stack[graph->top].entity;
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graph->top--;
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return entity;
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}
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#define link_top(en) ((en)->stack[(en)->top].link)
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#define stack_top(en) ((en)->stack[(en)->top].entity)
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/**
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* media_graph_walk_init - Allocate resources for graph walk
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* @graph: Media graph structure that will be used to walk the graph
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* @mdev: Media device
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*
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* Reserve resources for graph walk in media device's current
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* state. The memory must be released using
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* media_graph_walk_cleanup().
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*
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* Returns error on failure, zero on success.
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*/
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__must_check int media_graph_walk_init(
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struct media_graph *graph, struct media_device *mdev)
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{
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return media_entity_enum_init(&graph->ent_enum, mdev);
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}
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EXPORT_SYMBOL_GPL(media_graph_walk_init);
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/**
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* media_graph_walk_cleanup - Release resources related to graph walking
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* @graph: Media graph structure that was used to walk the graph
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*/
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void media_graph_walk_cleanup(struct media_graph *graph)
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{
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media_entity_enum_cleanup(&graph->ent_enum);
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}
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EXPORT_SYMBOL_GPL(media_graph_walk_cleanup);
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void media_graph_walk_start(struct media_graph *graph,
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struct media_entity *entity)
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{
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media_entity_enum_zero(&graph->ent_enum);
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media_entity_enum_set(&graph->ent_enum, entity);
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graph->top = 0;
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graph->stack[graph->top].entity = NULL;
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stack_push(graph, entity);
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dev_dbg(entity->graph_obj.mdev->dev,
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"begin graph walk at '%s'\n", entity->name);
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}
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EXPORT_SYMBOL_GPL(media_graph_walk_start);
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static void media_graph_walk_iter(struct media_graph *graph)
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{
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struct media_entity *entity = stack_top(graph);
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struct media_link *link;
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struct media_entity *next;
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link = list_entry(link_top(graph), typeof(*link), list);
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/* If the link is not a data link, don't follow it */
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if ((link->flags & MEDIA_LNK_FL_LINK_TYPE) != MEDIA_LNK_FL_DATA_LINK) {
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link_top(graph) = link_top(graph)->next;
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return;
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}
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/* The link is not enabled so we do not follow. */
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if (!(link->flags & MEDIA_LNK_FL_ENABLED)) {
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link_top(graph) = link_top(graph)->next;
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dev_dbg(entity->graph_obj.mdev->dev,
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"walk: skipping disabled link '%s':%u -> '%s':%u\n",
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link->source->entity->name, link->source->index,
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link->sink->entity->name, link->sink->index);
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return;
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}
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/* Get the entity at the other end of the link. */
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next = media_entity_other(entity, link);
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/* Has the entity already been visited? */
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if (media_entity_enum_test_and_set(&graph->ent_enum, next)) {
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link_top(graph) = link_top(graph)->next;
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dev_dbg(entity->graph_obj.mdev->dev,
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"walk: skipping entity '%s' (already seen)\n",
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next->name);
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return;
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}
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/* Push the new entity to stack and start over. */
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link_top(graph) = link_top(graph)->next;
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stack_push(graph, next);
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dev_dbg(entity->graph_obj.mdev->dev, "walk: pushing '%s' on stack\n",
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next->name);
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lockdep_assert_held(&entity->graph_obj.mdev->graph_mutex);
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}
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struct media_entity *media_graph_walk_next(struct media_graph *graph)
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{
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struct media_entity *entity;
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if (stack_top(graph) == NULL)
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return NULL;
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/*
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* Depth first search. Push entity to stack and continue from
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* top of the stack until no more entities on the level can be
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* found.
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*/
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while (link_top(graph) != &stack_top(graph)->links)
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media_graph_walk_iter(graph);
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entity = stack_pop(graph);
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dev_dbg(entity->graph_obj.mdev->dev,
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"walk: returning entity '%s'\n", entity->name);
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return entity;
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}
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EXPORT_SYMBOL_GPL(media_graph_walk_next);
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/* -----------------------------------------------------------------------------
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* Pipeline management
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*/
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/*
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* The pipeline traversal stack stores pads that are reached during graph
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* traversal, with a list of links to be visited to continue the traversal.
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* When a new pad is reached, an entry is pushed on the top of the stack and
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* points to the incoming pad and the first link of the entity.
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*
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* To find further pads in the pipeline, the traversal algorithm follows
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* internal pad dependencies in the entity, and then links in the graph. It
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* does so by iterating over all links of the entity, and following enabled
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* links that originate from a pad that is internally connected to the incoming
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* pad, as reported by the media_entity_has_pad_interdep() function.
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*/
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/**
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* struct media_pipeline_walk_entry - Entry in the pipeline traversal stack
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*
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* @pad: The media pad being visited
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* @links: Links left to be visited
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*/
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struct media_pipeline_walk_entry {
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struct media_pad *pad;
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struct list_head *links;
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};
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/**
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* struct media_pipeline_walk - State used by the media pipeline traversal
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* algorithm
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*
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* @mdev: The media device
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* @stack: Depth-first search stack
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* @stack.size: Number of allocated entries in @stack.entries
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* @stack.top: Index of the top stack entry (-1 if the stack is empty)
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* @stack.entries: Stack entries
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*/
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struct media_pipeline_walk {
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struct media_device *mdev;
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struct {
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unsigned int size;
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int top;
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struct media_pipeline_walk_entry *entries;
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} stack;
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};
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#define MEDIA_PIPELINE_STACK_GROW_STEP 16
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static struct media_pipeline_walk_entry *
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media_pipeline_walk_top(struct media_pipeline_walk *walk)
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{
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return &walk->stack.entries[walk->stack.top];
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}
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static bool media_pipeline_walk_empty(struct media_pipeline_walk *walk)
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{
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return walk->stack.top == -1;
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}
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/* Increase the stack size by MEDIA_PIPELINE_STACK_GROW_STEP elements. */
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static int media_pipeline_walk_resize(struct media_pipeline_walk *walk)
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{
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struct media_pipeline_walk_entry *entries;
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unsigned int new_size;
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/* Safety check, to avoid stack overflows in case of bugs. */
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if (walk->stack.size >= 256)
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return -E2BIG;
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new_size = walk->stack.size + MEDIA_PIPELINE_STACK_GROW_STEP;
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entries = krealloc(walk->stack.entries,
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new_size * sizeof(*walk->stack.entries),
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GFP_KERNEL);
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if (!entries)
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return -ENOMEM;
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walk->stack.entries = entries;
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walk->stack.size = new_size;
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return 0;
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}
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|
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/* Push a new entry on the stack. */
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static int media_pipeline_walk_push(struct media_pipeline_walk *walk,
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struct media_pad *pad)
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{
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struct media_pipeline_walk_entry *entry;
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int ret;
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|
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if (walk->stack.top + 1 >= walk->stack.size) {
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ret = media_pipeline_walk_resize(walk);
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if (ret)
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return ret;
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|
}
|
|
|
|
walk->stack.top++;
|
|
entry = media_pipeline_walk_top(walk);
|
|
entry->pad = pad;
|
|
entry->links = pad->entity->links.next;
|
|
|
|
dev_dbg(walk->mdev->dev,
|
|
"media pipeline: pushed entry %u: '%s':%u\n",
|
|
walk->stack.top, pad->entity->name, pad->index);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Move the top entry link cursor to the next link. If all links of the entry
|
|
* have been visited, pop the entry itself.
|
|
*/
|
|
static void media_pipeline_walk_pop(struct media_pipeline_walk *walk)
|
|
{
|
|
struct media_pipeline_walk_entry *entry;
|
|
|
|
if (WARN_ON(walk->stack.top < 0))
|
|
return;
|
|
|
|
entry = media_pipeline_walk_top(walk);
|
|
|
|
if (entry->links->next == &entry->pad->entity->links) {
|
|
dev_dbg(walk->mdev->dev,
|
|
"media pipeline: entry %u has no more links, popping\n",
|
|
walk->stack.top);
|
|
|
|
walk->stack.top--;
|
|
return;
|
|
}
|
|
|
|
entry->links = entry->links->next;
|
|
|
|
dev_dbg(walk->mdev->dev,
|
|
"media pipeline: moved entry %u to next link\n",
|
|
walk->stack.top);
|
|
}
|
|
|
|
/* Free all memory allocated while walking the pipeline. */
|
|
static void media_pipeline_walk_destroy(struct media_pipeline_walk *walk)
|
|
{
|
|
kfree(walk->stack.entries);
|
|
}
|
|
|
|
/* Add a pad to the pipeline and push it to the stack. */
|
|
static int media_pipeline_add_pad(struct media_pipeline *pipe,
|
|
struct media_pipeline_walk *walk,
|
|
struct media_pad *pad)
|
|
{
|
|
struct media_pipeline_pad *ppad;
|
|
|
|
list_for_each_entry(ppad, &pipe->pads, list) {
|
|
if (ppad->pad == pad) {
|
|
dev_dbg(pad->graph_obj.mdev->dev,
|
|
"media pipeline: already contains pad '%s':%u\n",
|
|
pad->entity->name, pad->index);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
ppad = kzalloc(sizeof(*ppad), GFP_KERNEL);
|
|
if (!ppad)
|
|
return -ENOMEM;
|
|
|
|
ppad->pipe = pipe;
|
|
ppad->pad = pad;
|
|
|
|
list_add_tail(&ppad->list, &pipe->pads);
|
|
|
|
dev_dbg(pad->graph_obj.mdev->dev,
|
|
"media pipeline: added pad '%s':%u\n",
|
|
pad->entity->name, pad->index);
|
|
|
|
return media_pipeline_walk_push(walk, pad);
|
|
}
|
|
|
|
/* Explore the next link of the entity at the top of the stack. */
|
|
static int media_pipeline_explore_next_link(struct media_pipeline *pipe,
|
|
struct media_pipeline_walk *walk)
|
|
{
|
|
struct media_pipeline_walk_entry *entry = media_pipeline_walk_top(walk);
|
|
struct media_pad *pad;
|
|
struct media_link *link;
|
|
struct media_pad *local;
|
|
struct media_pad *remote;
|
|
int ret;
|
|
|
|
pad = entry->pad;
|
|
link = list_entry(entry->links, typeof(*link), list);
|
|
media_pipeline_walk_pop(walk);
|
|
|
|
dev_dbg(walk->mdev->dev,
|
|
"media pipeline: exploring link '%s':%u -> '%s':%u\n",
|
|
link->source->entity->name, link->source->index,
|
|
link->sink->entity->name, link->sink->index);
|
|
|
|
/* Skip links that are not enabled. */
|
|
if (!(link->flags & MEDIA_LNK_FL_ENABLED)) {
|
|
dev_dbg(walk->mdev->dev,
|
|
"media pipeline: skipping link (disabled)\n");
|
|
return 0;
|
|
}
|
|
|
|
/* Get the local pad and remote pad. */
|
|
if (link->source->entity == pad->entity) {
|
|
local = link->source;
|
|
remote = link->sink;
|
|
} else {
|
|
local = link->sink;
|
|
remote = link->source;
|
|
}
|
|
|
|
/*
|
|
* Skip links that originate from a different pad than the incoming pad
|
|
* that is not connected internally in the entity to the incoming pad.
|
|
*/
|
|
if (pad != local &&
|
|
!media_entity_has_pad_interdep(pad->entity, pad->index, local->index)) {
|
|
dev_dbg(walk->mdev->dev,
|
|
"media pipeline: skipping link (no route)\n");
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Add the local and remote pads of the link to the pipeline and push
|
|
* them to the stack, if they're not already present.
|
|
*/
|
|
ret = media_pipeline_add_pad(pipe, walk, local);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = media_pipeline_add_pad(pipe, walk, remote);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void media_pipeline_cleanup(struct media_pipeline *pipe)
|
|
{
|
|
while (!list_empty(&pipe->pads)) {
|
|
struct media_pipeline_pad *ppad;
|
|
|
|
ppad = list_first_entry(&pipe->pads, typeof(*ppad), list);
|
|
list_del(&ppad->list);
|
|
kfree(ppad);
|
|
}
|
|
}
|
|
|
|
static int media_pipeline_populate(struct media_pipeline *pipe,
|
|
struct media_pad *pad)
|
|
{
|
|
struct media_pipeline_walk walk = { };
|
|
struct media_pipeline_pad *ppad;
|
|
int ret;
|
|
|
|
/*
|
|
* Populate the media pipeline by walking the media graph, starting
|
|
* from @pad.
|
|
*/
|
|
INIT_LIST_HEAD(&pipe->pads);
|
|
pipe->mdev = pad->graph_obj.mdev;
|
|
|
|
walk.mdev = pipe->mdev;
|
|
walk.stack.top = -1;
|
|
ret = media_pipeline_add_pad(pipe, &walk, pad);
|
|
if (ret)
|
|
goto done;
|
|
|
|
/*
|
|
* Use a depth-first search algorithm: as long as the stack is not
|
|
* empty, explore the next link of the top entry. The
|
|
* media_pipeline_explore_next_link() function will either move to the
|
|
* next link, pop the entry if fully visited, or add new entries on
|
|
* top.
|
|
*/
|
|
while (!media_pipeline_walk_empty(&walk)) {
|
|
ret = media_pipeline_explore_next_link(pipe, &walk);
|
|
if (ret)
|
|
goto done;
|
|
}
|
|
|
|
dev_dbg(pad->graph_obj.mdev->dev,
|
|
"media pipeline populated, found pads:\n");
|
|
|
|
list_for_each_entry(ppad, &pipe->pads, list)
|
|
dev_dbg(pad->graph_obj.mdev->dev, "- '%s':%u\n",
|
|
ppad->pad->entity->name, ppad->pad->index);
|
|
|
|
WARN_ON(walk.stack.top != -1);
|
|
|
|
ret = 0;
|
|
|
|
done:
|
|
media_pipeline_walk_destroy(&walk);
|
|
|
|
if (ret)
|
|
media_pipeline_cleanup(pipe);
|
|
|
|
return ret;
|
|
}
|
|
|
|
__must_check int __media_pipeline_start(struct media_pad *pad,
|
|
struct media_pipeline *pipe)
|
|
{
|
|
struct media_device *mdev = pad->graph_obj.mdev;
|
|
struct media_pipeline_pad *err_ppad;
|
|
struct media_pipeline_pad *ppad;
|
|
int ret;
|
|
|
|
lockdep_assert_held(&mdev->graph_mutex);
|
|
|
|
/*
|
|
* If the pad is already part of a pipeline, that pipeline must be the
|
|
* same as the pipe given to media_pipeline_start().
|
|
*/
|
|
if (WARN_ON(pad->pipe && pad->pipe != pipe))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* If the pipeline has already been started, it is guaranteed to be
|
|
* valid, so just increase the start count.
|
|
*/
|
|
if (pipe->start_count) {
|
|
pipe->start_count++;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Populate the pipeline. This populates the media_pipeline pads list
|
|
* with media_pipeline_pad instances for each pad found during graph
|
|
* walk.
|
|
*/
|
|
ret = media_pipeline_populate(pipe, pad);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* Now that all the pads in the pipeline have been gathered, perform
|
|
* the validation steps.
|
|
*/
|
|
|
|
list_for_each_entry(ppad, &pipe->pads, list) {
|
|
struct media_pad *pad = ppad->pad;
|
|
struct media_entity *entity = pad->entity;
|
|
bool has_enabled_link = false;
|
|
bool has_link = false;
|
|
struct media_link *link;
|
|
|
|
dev_dbg(mdev->dev, "Validating pad '%s':%u\n", pad->entity->name,
|
|
pad->index);
|
|
|
|
/*
|
|
* 1. Ensure that the pad doesn't already belong to a different
|
|
* pipeline.
|
|
*/
|
|
if (pad->pipe) {
|
|
dev_dbg(mdev->dev, "Failed to start pipeline: pad '%s':%u busy\n",
|
|
pad->entity->name, pad->index);
|
|
ret = -EBUSY;
|
|
goto error;
|
|
}
|
|
|
|
/*
|
|
* 2. Validate all active links whose sink is the current pad.
|
|
* Validation of the source pads is performed in the context of
|
|
* the connected sink pad to avoid duplicating checks.
|
|
*/
|
|
for_each_media_entity_data_link(entity, link) {
|
|
/* Skip links unrelated to the current pad. */
|
|
if (link->sink != pad && link->source != pad)
|
|
continue;
|
|
|
|
/* Record if the pad has links and enabled links. */
|
|
if (link->flags & MEDIA_LNK_FL_ENABLED)
|
|
has_enabled_link = true;
|
|
has_link = true;
|
|
|
|
/*
|
|
* Validate the link if it's enabled and has the
|
|
* current pad as its sink.
|
|
*/
|
|
if (!(link->flags & MEDIA_LNK_FL_ENABLED))
|
|
continue;
|
|
|
|
if (link->sink != pad)
|
|
continue;
|
|
|
|
if (!entity->ops || !entity->ops->link_validate)
|
|
continue;
|
|
|
|
ret = entity->ops->link_validate(link);
|
|
if (ret) {
|
|
dev_dbg(mdev->dev,
|
|
"Link '%s':%u -> '%s':%u failed validation: %d\n",
|
|
link->source->entity->name,
|
|
link->source->index,
|
|
link->sink->entity->name,
|
|
link->sink->index, ret);
|
|
goto error;
|
|
}
|
|
|
|
dev_dbg(mdev->dev,
|
|
"Link '%s':%u -> '%s':%u is valid\n",
|
|
link->source->entity->name,
|
|
link->source->index,
|
|
link->sink->entity->name,
|
|
link->sink->index);
|
|
}
|
|
|
|
/*
|
|
* 3. If the pad has the MEDIA_PAD_FL_MUST_CONNECT flag set,
|
|
* ensure that it has either no link or an enabled link.
|
|
*/
|
|
if ((pad->flags & MEDIA_PAD_FL_MUST_CONNECT) && has_link &&
|
|
!has_enabled_link) {
|
|
dev_dbg(mdev->dev,
|
|
"Pad '%s':%u must be connected by an enabled link\n",
|
|
pad->entity->name, pad->index);
|
|
ret = -ENOLINK;
|
|
goto error;
|
|
}
|
|
|
|
/* Validation passed, store the pipe pointer in the pad. */
|
|
pad->pipe = pipe;
|
|
}
|
|
|
|
pipe->start_count++;
|
|
|
|
return 0;
|
|
|
|
error:
|
|
/*
|
|
* Link validation on graph failed. We revert what we did and
|
|
* return the error.
|
|
*/
|
|
|
|
list_for_each_entry(err_ppad, &pipe->pads, list) {
|
|
if (err_ppad == ppad)
|
|
break;
|
|
|
|
err_ppad->pad->pipe = NULL;
|
|
}
|
|
|
|
media_pipeline_cleanup(pipe);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__media_pipeline_start);
|
|
|
|
__must_check int media_pipeline_start(struct media_pad *pad,
|
|
struct media_pipeline *pipe)
|
|
{
|
|
struct media_device *mdev = pad->graph_obj.mdev;
|
|
int ret;
|
|
|
|
mutex_lock(&mdev->graph_mutex);
|
|
ret = __media_pipeline_start(pad, pipe);
|
|
mutex_unlock(&mdev->graph_mutex);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_pipeline_start);
|
|
|
|
void __media_pipeline_stop(struct media_pad *pad)
|
|
{
|
|
struct media_pipeline *pipe = pad->pipe;
|
|
struct media_pipeline_pad *ppad;
|
|
|
|
/*
|
|
* If the following check fails, the driver has performed an
|
|
* unbalanced call to media_pipeline_stop()
|
|
*/
|
|
if (WARN_ON(!pipe))
|
|
return;
|
|
|
|
if (--pipe->start_count)
|
|
return;
|
|
|
|
list_for_each_entry(ppad, &pipe->pads, list)
|
|
ppad->pad->pipe = NULL;
|
|
|
|
media_pipeline_cleanup(pipe);
|
|
|
|
if (pipe->allocated)
|
|
kfree(pipe);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__media_pipeline_stop);
|
|
|
|
void media_pipeline_stop(struct media_pad *pad)
|
|
{
|
|
struct media_device *mdev = pad->graph_obj.mdev;
|
|
|
|
mutex_lock(&mdev->graph_mutex);
|
|
__media_pipeline_stop(pad);
|
|
mutex_unlock(&mdev->graph_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_pipeline_stop);
|
|
|
|
__must_check int media_pipeline_alloc_start(struct media_pad *pad)
|
|
{
|
|
struct media_device *mdev = pad->graph_obj.mdev;
|
|
struct media_pipeline *new_pipe = NULL;
|
|
struct media_pipeline *pipe;
|
|
int ret;
|
|
|
|
mutex_lock(&mdev->graph_mutex);
|
|
|
|
/*
|
|
* Is the pad already part of a pipeline? If not, we need to allocate
|
|
* a pipe.
|
|
*/
|
|
pipe = media_pad_pipeline(pad);
|
|
if (!pipe) {
|
|
new_pipe = kzalloc(sizeof(*new_pipe), GFP_KERNEL);
|
|
if (!new_pipe) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
pipe = new_pipe;
|
|
pipe->allocated = true;
|
|
}
|
|
|
|
ret = __media_pipeline_start(pad, pipe);
|
|
if (ret)
|
|
kfree(new_pipe);
|
|
|
|
out:
|
|
mutex_unlock(&mdev->graph_mutex);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_pipeline_alloc_start);
|
|
|
|
struct media_pad *
|
|
__media_pipeline_pad_iter_next(struct media_pipeline *pipe,
|
|
struct media_pipeline_pad_iter *iter,
|
|
struct media_pad *pad)
|
|
{
|
|
if (!pad)
|
|
iter->cursor = pipe->pads.next;
|
|
|
|
if (iter->cursor == &pipe->pads)
|
|
return NULL;
|
|
|
|
pad = list_entry(iter->cursor, struct media_pipeline_pad, list)->pad;
|
|
iter->cursor = iter->cursor->next;
|
|
|
|
return pad;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__media_pipeline_pad_iter_next);
|
|
|
|
int media_pipeline_entity_iter_init(struct media_pipeline *pipe,
|
|
struct media_pipeline_entity_iter *iter)
|
|
{
|
|
return media_entity_enum_init(&iter->ent_enum, pipe->mdev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_pipeline_entity_iter_init);
|
|
|
|
void media_pipeline_entity_iter_cleanup(struct media_pipeline_entity_iter *iter)
|
|
{
|
|
media_entity_enum_cleanup(&iter->ent_enum);
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_pipeline_entity_iter_cleanup);
|
|
|
|
struct media_entity *
|
|
__media_pipeline_entity_iter_next(struct media_pipeline *pipe,
|
|
struct media_pipeline_entity_iter *iter,
|
|
struct media_entity *entity)
|
|
{
|
|
if (!entity)
|
|
iter->cursor = pipe->pads.next;
|
|
|
|
while (iter->cursor != &pipe->pads) {
|
|
struct media_pipeline_pad *ppad;
|
|
struct media_entity *entity;
|
|
|
|
ppad = list_entry(iter->cursor, struct media_pipeline_pad, list);
|
|
entity = ppad->pad->entity;
|
|
iter->cursor = iter->cursor->next;
|
|
|
|
if (!media_entity_enum_test_and_set(&iter->ent_enum, entity))
|
|
return entity;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__media_pipeline_entity_iter_next);
|
|
|
|
/* -----------------------------------------------------------------------------
|
|
* Links management
|
|
*/
|
|
|
|
static struct media_link *media_add_link(struct list_head *head)
|
|
{
|
|
struct media_link *link;
|
|
|
|
link = kzalloc(sizeof(*link), GFP_KERNEL);
|
|
if (link == NULL)
|
|
return NULL;
|
|
|
|
list_add_tail(&link->list, head);
|
|
|
|
return link;
|
|
}
|
|
|
|
static void __media_entity_remove_link(struct media_entity *entity,
|
|
struct media_link *link)
|
|
{
|
|
struct media_link *rlink, *tmp;
|
|
struct media_entity *remote;
|
|
|
|
/* Remove the reverse links for a data link. */
|
|
if ((link->flags & MEDIA_LNK_FL_LINK_TYPE) == MEDIA_LNK_FL_DATA_LINK) {
|
|
if (link->source->entity == entity)
|
|
remote = link->sink->entity;
|
|
else
|
|
remote = link->source->entity;
|
|
|
|
list_for_each_entry_safe(rlink, tmp, &remote->links, list) {
|
|
if (rlink != link->reverse)
|
|
continue;
|
|
|
|
if (link->source->entity == entity)
|
|
remote->num_backlinks--;
|
|
|
|
/* Remove the remote link */
|
|
list_del(&rlink->list);
|
|
media_gobj_destroy(&rlink->graph_obj);
|
|
kfree(rlink);
|
|
|
|
if (--remote->num_links == 0)
|
|
break;
|
|
}
|
|
}
|
|
|
|
list_del(&link->list);
|
|
media_gobj_destroy(&link->graph_obj);
|
|
kfree(link);
|
|
}
|
|
|
|
int media_get_pad_index(struct media_entity *entity, u32 pad_type,
|
|
enum media_pad_signal_type sig_type)
|
|
{
|
|
unsigned int i;
|
|
|
|
if (!entity)
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < entity->num_pads; i++) {
|
|
if ((entity->pads[i].flags &
|
|
(MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_SOURCE)) != pad_type)
|
|
continue;
|
|
|
|
if (entity->pads[i].sig_type == sig_type)
|
|
return i;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_get_pad_index);
|
|
|
|
int
|
|
media_create_pad_link(struct media_entity *source, u16 source_pad,
|
|
struct media_entity *sink, u16 sink_pad, u32 flags)
|
|
{
|
|
struct media_link *link;
|
|
struct media_link *backlink;
|
|
|
|
if (WARN_ON(!source || !sink) ||
|
|
WARN_ON(source_pad >= source->num_pads) ||
|
|
WARN_ON(sink_pad >= sink->num_pads))
|
|
return -EINVAL;
|
|
if (WARN_ON(!(source->pads[source_pad].flags & MEDIA_PAD_FL_SOURCE)))
|
|
return -EINVAL;
|
|
if (WARN_ON(!(sink->pads[sink_pad].flags & MEDIA_PAD_FL_SINK)))
|
|
return -EINVAL;
|
|
|
|
link = media_add_link(&source->links);
|
|
if (link == NULL)
|
|
return -ENOMEM;
|
|
|
|
link->source = &source->pads[source_pad];
|
|
link->sink = &sink->pads[sink_pad];
|
|
link->flags = flags & ~MEDIA_LNK_FL_INTERFACE_LINK;
|
|
|
|
/* Initialize graph object embedded at the new link */
|
|
media_gobj_create(source->graph_obj.mdev, MEDIA_GRAPH_LINK,
|
|
&link->graph_obj);
|
|
|
|
/* Create the backlink. Backlinks are used to help graph traversal and
|
|
* are not reported to userspace.
|
|
*/
|
|
backlink = media_add_link(&sink->links);
|
|
if (backlink == NULL) {
|
|
__media_entity_remove_link(source, link);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
backlink->source = &source->pads[source_pad];
|
|
backlink->sink = &sink->pads[sink_pad];
|
|
backlink->flags = flags;
|
|
backlink->is_backlink = true;
|
|
|
|
/* Initialize graph object embedded at the new link */
|
|
media_gobj_create(sink->graph_obj.mdev, MEDIA_GRAPH_LINK,
|
|
&backlink->graph_obj);
|
|
|
|
link->reverse = backlink;
|
|
backlink->reverse = link;
|
|
|
|
sink->num_backlinks++;
|
|
sink->num_links++;
|
|
source->num_links++;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_create_pad_link);
|
|
|
|
int media_create_pad_links(const struct media_device *mdev,
|
|
const u32 source_function,
|
|
struct media_entity *source,
|
|
const u16 source_pad,
|
|
const u32 sink_function,
|
|
struct media_entity *sink,
|
|
const u16 sink_pad,
|
|
u32 flags,
|
|
const bool allow_both_undefined)
|
|
{
|
|
struct media_entity *entity;
|
|
unsigned function;
|
|
int ret;
|
|
|
|
/* Trivial case: 1:1 relation */
|
|
if (source && sink)
|
|
return media_create_pad_link(source, source_pad,
|
|
sink, sink_pad, flags);
|
|
|
|
/* Worse case scenario: n:n relation */
|
|
if (!source && !sink) {
|
|
if (!allow_both_undefined)
|
|
return 0;
|
|
media_device_for_each_entity(source, mdev) {
|
|
if (source->function != source_function)
|
|
continue;
|
|
media_device_for_each_entity(sink, mdev) {
|
|
if (sink->function != sink_function)
|
|
continue;
|
|
ret = media_create_pad_link(source, source_pad,
|
|
sink, sink_pad,
|
|
flags);
|
|
if (ret)
|
|
return ret;
|
|
flags &= ~(MEDIA_LNK_FL_ENABLED |
|
|
MEDIA_LNK_FL_IMMUTABLE);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Handle 1:n and n:1 cases */
|
|
if (source)
|
|
function = sink_function;
|
|
else
|
|
function = source_function;
|
|
|
|
media_device_for_each_entity(entity, mdev) {
|
|
if (entity->function != function)
|
|
continue;
|
|
|
|
if (source)
|
|
ret = media_create_pad_link(source, source_pad,
|
|
entity, sink_pad, flags);
|
|
else
|
|
ret = media_create_pad_link(entity, source_pad,
|
|
sink, sink_pad, flags);
|
|
if (ret)
|
|
return ret;
|
|
flags &= ~(MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE);
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_create_pad_links);
|
|
|
|
void __media_entity_remove_links(struct media_entity *entity)
|
|
{
|
|
struct media_link *link, *tmp;
|
|
|
|
list_for_each_entry_safe(link, tmp, &entity->links, list)
|
|
__media_entity_remove_link(entity, link);
|
|
|
|
entity->num_links = 0;
|
|
entity->num_backlinks = 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__media_entity_remove_links);
|
|
|
|
void media_entity_remove_links(struct media_entity *entity)
|
|
{
|
|
struct media_device *mdev = entity->graph_obj.mdev;
|
|
|
|
/* Do nothing if the entity is not registered. */
|
|
if (mdev == NULL)
|
|
return;
|
|
|
|
mutex_lock(&mdev->graph_mutex);
|
|
__media_entity_remove_links(entity);
|
|
mutex_unlock(&mdev->graph_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_entity_remove_links);
|
|
|
|
static int __media_entity_setup_link_notify(struct media_link *link, u32 flags)
|
|
{
|
|
int ret;
|
|
|
|
/* Notify both entities. */
|
|
ret = media_entity_call(link->source->entity, link_setup,
|
|
link->source, link->sink, flags);
|
|
if (ret < 0 && ret != -ENOIOCTLCMD)
|
|
return ret;
|
|
|
|
ret = media_entity_call(link->sink->entity, link_setup,
|
|
link->sink, link->source, flags);
|
|
if (ret < 0 && ret != -ENOIOCTLCMD) {
|
|
media_entity_call(link->source->entity, link_setup,
|
|
link->source, link->sink, link->flags);
|
|
return ret;
|
|
}
|
|
|
|
link->flags = flags;
|
|
link->reverse->flags = link->flags;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __media_entity_setup_link(struct media_link *link, u32 flags)
|
|
{
|
|
const u32 mask = MEDIA_LNK_FL_ENABLED;
|
|
struct media_device *mdev;
|
|
struct media_pad *source, *sink;
|
|
int ret = -EBUSY;
|
|
|
|
if (link == NULL)
|
|
return -EINVAL;
|
|
|
|
/* The non-modifiable link flags must not be modified. */
|
|
if ((link->flags & ~mask) != (flags & ~mask))
|
|
return -EINVAL;
|
|
|
|
if (link->flags & MEDIA_LNK_FL_IMMUTABLE)
|
|
return link->flags == flags ? 0 : -EINVAL;
|
|
|
|
if (link->flags == flags)
|
|
return 0;
|
|
|
|
source = link->source;
|
|
sink = link->sink;
|
|
|
|
if (!(link->flags & MEDIA_LNK_FL_DYNAMIC) &&
|
|
(media_pad_is_streaming(source) || media_pad_is_streaming(sink)))
|
|
return -EBUSY;
|
|
|
|
mdev = source->graph_obj.mdev;
|
|
|
|
if (mdev->ops && mdev->ops->link_notify) {
|
|
ret = mdev->ops->link_notify(link, flags,
|
|
MEDIA_DEV_NOTIFY_PRE_LINK_CH);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
ret = __media_entity_setup_link_notify(link, flags);
|
|
|
|
if (mdev->ops && mdev->ops->link_notify)
|
|
mdev->ops->link_notify(link, flags,
|
|
MEDIA_DEV_NOTIFY_POST_LINK_CH);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__media_entity_setup_link);
|
|
|
|
int media_entity_setup_link(struct media_link *link, u32 flags)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&link->graph_obj.mdev->graph_mutex);
|
|
ret = __media_entity_setup_link(link, flags);
|
|
mutex_unlock(&link->graph_obj.mdev->graph_mutex);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_entity_setup_link);
|
|
|
|
struct media_link *
|
|
media_entity_find_link(struct media_pad *source, struct media_pad *sink)
|
|
{
|
|
struct media_link *link;
|
|
|
|
for_each_media_entity_data_link(source->entity, link) {
|
|
if (link->source->entity == source->entity &&
|
|
link->source->index == source->index &&
|
|
link->sink->entity == sink->entity &&
|
|
link->sink->index == sink->index)
|
|
return link;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_entity_find_link);
|
|
|
|
struct media_pad *media_pad_remote_pad_first(const struct media_pad *pad)
|
|
{
|
|
struct media_link *link;
|
|
|
|
for_each_media_entity_data_link(pad->entity, link) {
|
|
if (!(link->flags & MEDIA_LNK_FL_ENABLED))
|
|
continue;
|
|
|
|
if (link->source == pad)
|
|
return link->sink;
|
|
|
|
if (link->sink == pad)
|
|
return link->source;
|
|
}
|
|
|
|
return NULL;
|
|
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_pad_remote_pad_first);
|
|
|
|
struct media_pad *
|
|
media_entity_remote_pad_unique(const struct media_entity *entity,
|
|
unsigned int type)
|
|
{
|
|
struct media_pad *pad = NULL;
|
|
struct media_link *link;
|
|
|
|
list_for_each_entry(link, &entity->links, list) {
|
|
struct media_pad *local_pad;
|
|
struct media_pad *remote_pad;
|
|
|
|
if (((link->flags & MEDIA_LNK_FL_LINK_TYPE) !=
|
|
MEDIA_LNK_FL_DATA_LINK) ||
|
|
!(link->flags & MEDIA_LNK_FL_ENABLED))
|
|
continue;
|
|
|
|
if (type == MEDIA_PAD_FL_SOURCE) {
|
|
local_pad = link->sink;
|
|
remote_pad = link->source;
|
|
} else {
|
|
local_pad = link->source;
|
|
remote_pad = link->sink;
|
|
}
|
|
|
|
if (local_pad->entity == entity) {
|
|
if (pad)
|
|
return ERR_PTR(-ENOTUNIQ);
|
|
|
|
pad = remote_pad;
|
|
}
|
|
}
|
|
|
|
if (!pad)
|
|
return ERR_PTR(-ENOLINK);
|
|
|
|
return pad;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_entity_remote_pad_unique);
|
|
|
|
struct media_pad *media_pad_remote_pad_unique(const struct media_pad *pad)
|
|
{
|
|
struct media_pad *found_pad = NULL;
|
|
struct media_link *link;
|
|
|
|
list_for_each_entry(link, &pad->entity->links, list) {
|
|
struct media_pad *remote_pad;
|
|
|
|
if (!(link->flags & MEDIA_LNK_FL_ENABLED))
|
|
continue;
|
|
|
|
if (link->sink == pad)
|
|
remote_pad = link->source;
|
|
else if (link->source == pad)
|
|
remote_pad = link->sink;
|
|
else
|
|
continue;
|
|
|
|
if (found_pad)
|
|
return ERR_PTR(-ENOTUNIQ);
|
|
|
|
found_pad = remote_pad;
|
|
}
|
|
|
|
if (!found_pad)
|
|
return ERR_PTR(-ENOLINK);
|
|
|
|
return found_pad;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_pad_remote_pad_unique);
|
|
|
|
int media_entity_get_fwnode_pad(struct media_entity *entity,
|
|
const struct fwnode_handle *fwnode,
|
|
unsigned long direction_flags)
|
|
{
|
|
struct fwnode_endpoint endpoint;
|
|
unsigned int i;
|
|
int ret;
|
|
|
|
if (!entity->ops || !entity->ops->get_fwnode_pad) {
|
|
for (i = 0; i < entity->num_pads; i++) {
|
|
if (entity->pads[i].flags & direction_flags)
|
|
return i;
|
|
}
|
|
|
|
return -ENXIO;
|
|
}
|
|
|
|
ret = fwnode_graph_parse_endpoint(fwnode, &endpoint);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = entity->ops->get_fwnode_pad(entity, &endpoint);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (ret >= entity->num_pads)
|
|
return -ENXIO;
|
|
|
|
if (!(entity->pads[ret].flags & direction_flags))
|
|
return -ENXIO;
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_entity_get_fwnode_pad);
|
|
|
|
struct media_pipeline *media_entity_pipeline(struct media_entity *entity)
|
|
{
|
|
struct media_pad *pad;
|
|
|
|
media_entity_for_each_pad(entity, pad) {
|
|
if (pad->pipe)
|
|
return pad->pipe;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_entity_pipeline);
|
|
|
|
struct media_pipeline *media_pad_pipeline(struct media_pad *pad)
|
|
{
|
|
return pad->pipe;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_pad_pipeline);
|
|
|
|
static void media_interface_init(struct media_device *mdev,
|
|
struct media_interface *intf,
|
|
u32 gobj_type,
|
|
u32 intf_type, u32 flags)
|
|
{
|
|
intf->type = intf_type;
|
|
intf->flags = flags;
|
|
INIT_LIST_HEAD(&intf->links);
|
|
|
|
media_gobj_create(mdev, gobj_type, &intf->graph_obj);
|
|
}
|
|
|
|
/* Functions related to the media interface via device nodes */
|
|
|
|
struct media_intf_devnode *media_devnode_create(struct media_device *mdev,
|
|
u32 type, u32 flags,
|
|
u32 major, u32 minor)
|
|
{
|
|
struct media_intf_devnode *devnode;
|
|
|
|
devnode = kzalloc(sizeof(*devnode), GFP_KERNEL);
|
|
if (!devnode)
|
|
return NULL;
|
|
|
|
devnode->major = major;
|
|
devnode->minor = minor;
|
|
|
|
media_interface_init(mdev, &devnode->intf, MEDIA_GRAPH_INTF_DEVNODE,
|
|
type, flags);
|
|
|
|
return devnode;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_devnode_create);
|
|
|
|
void media_devnode_remove(struct media_intf_devnode *devnode)
|
|
{
|
|
media_remove_intf_links(&devnode->intf);
|
|
media_gobj_destroy(&devnode->intf.graph_obj);
|
|
kfree(devnode);
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_devnode_remove);
|
|
|
|
struct media_link *media_create_intf_link(struct media_entity *entity,
|
|
struct media_interface *intf,
|
|
u32 flags)
|
|
{
|
|
struct media_link *link;
|
|
|
|
link = media_add_link(&intf->links);
|
|
if (link == NULL)
|
|
return NULL;
|
|
|
|
link->intf = intf;
|
|
link->entity = entity;
|
|
link->flags = flags | MEDIA_LNK_FL_INTERFACE_LINK;
|
|
|
|
/* Initialize graph object embedded at the new link */
|
|
media_gobj_create(intf->graph_obj.mdev, MEDIA_GRAPH_LINK,
|
|
&link->graph_obj);
|
|
|
|
return link;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_create_intf_link);
|
|
|
|
void __media_remove_intf_link(struct media_link *link)
|
|
{
|
|
list_del(&link->list);
|
|
media_gobj_destroy(&link->graph_obj);
|
|
kfree(link);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__media_remove_intf_link);
|
|
|
|
void media_remove_intf_link(struct media_link *link)
|
|
{
|
|
struct media_device *mdev = link->graph_obj.mdev;
|
|
|
|
/* Do nothing if the intf is not registered. */
|
|
if (mdev == NULL)
|
|
return;
|
|
|
|
mutex_lock(&mdev->graph_mutex);
|
|
__media_remove_intf_link(link);
|
|
mutex_unlock(&mdev->graph_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_remove_intf_link);
|
|
|
|
void __media_remove_intf_links(struct media_interface *intf)
|
|
{
|
|
struct media_link *link, *tmp;
|
|
|
|
list_for_each_entry_safe(link, tmp, &intf->links, list)
|
|
__media_remove_intf_link(link);
|
|
|
|
}
|
|
EXPORT_SYMBOL_GPL(__media_remove_intf_links);
|
|
|
|
void media_remove_intf_links(struct media_interface *intf)
|
|
{
|
|
struct media_device *mdev = intf->graph_obj.mdev;
|
|
|
|
/* Do nothing if the intf is not registered. */
|
|
if (mdev == NULL)
|
|
return;
|
|
|
|
mutex_lock(&mdev->graph_mutex);
|
|
__media_remove_intf_links(intf);
|
|
mutex_unlock(&mdev->graph_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_remove_intf_links);
|
|
|
|
struct media_link *media_create_ancillary_link(struct media_entity *primary,
|
|
struct media_entity *ancillary)
|
|
{
|
|
struct media_link *link;
|
|
|
|
link = media_add_link(&primary->links);
|
|
if (!link)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
link->gobj0 = &primary->graph_obj;
|
|
link->gobj1 = &ancillary->graph_obj;
|
|
link->flags = MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED |
|
|
MEDIA_LNK_FL_ANCILLARY_LINK;
|
|
|
|
/* Initialize graph object embedded in the new link */
|
|
media_gobj_create(primary->graph_obj.mdev, MEDIA_GRAPH_LINK,
|
|
&link->graph_obj);
|
|
|
|
return link;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_create_ancillary_link);
|
|
|
|
struct media_link *__media_entity_next_link(struct media_entity *entity,
|
|
struct media_link *link,
|
|
unsigned long link_type)
|
|
{
|
|
link = link ? list_next_entry(link, list)
|
|
: list_first_entry(&entity->links, typeof(*link), list);
|
|
|
|
list_for_each_entry_from(link, &entity->links, list)
|
|
if ((link->flags & MEDIA_LNK_FL_LINK_TYPE) == link_type)
|
|
return link;
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__media_entity_next_link);
|