1 // SPDX-License-Identifier: GPL-2.0-only
5  * Copyright (c) 2010-2013, NVIDIA Corporation.
19 	chlist->channels = kcalloc(num_channels, sizeof(struct host1x_channel),  in host1x_channel_list_init()
21 	if (!chlist->channels)  in host1x_channel_list_init()
22 		return -ENOMEM;  in host1x_channel_list_init()
24 	chlist->allocated_channels =  in host1x_channel_list_init()
27 	if (!chlist->allocated_channels) {  in host1x_channel_list_init()
28 		kfree(chlist->channels);  in host1x_channel_list_init()
29 		return -ENOMEM;  in host1x_channel_list_init()
32 	bitmap_zero(chlist->allocated_channels, num_channels);  in host1x_channel_list_init()
39 	kfree(chlist->allocated_channels);  in host1x_channel_list_free()
40 	kfree(chlist->channels);  in host1x_channel_list_free()
45 	struct host1x *host = dev_get_drvdata(job->channel->dev->parent);  in host1x_job_submit()  local
47 	return host1x_hw_channel_submit(host, job);  in host1x_job_submit()
53 	kref_get(&channel->refcount);  in host1x_channel_get()
60  * host1x_channel_get_index() - Attempt to get channel reference by index
61  * @host: Host1x device object
67 struct host1x_channel *host1x_channel_get_index(struct host1x *host,  in host1x_channel_get_index()  argument
70 	struct host1x_channel *ch = &host->channel_list.channels[index];  in host1x_channel_get_index()
72 	if (!kref_get_unless_zero(&ch->refcount))  in host1x_channel_get_index()
82 	struct host1x *host = dev_get_drvdata(channel->dev->parent);  in release_channel()  local
83 	struct host1x_channel_list *chlist = &host->channel_list;  in release_channel()
85 	host1x_hw_cdma_stop(host, &channel->cdma);  in release_channel()
86 	host1x_cdma_deinit(&channel->cdma);  in release_channel()
88 	clear_bit(channel->id, chlist->allocated_channels);  in release_channel()
93 	kref_put(&channel->refcount, release_channel);  in host1x_channel_put()
97 static struct host1x_channel *acquire_unused_channel(struct host1x *host)  in acquire_unused_channel()  argument
99 	struct host1x_channel_list *chlist = &host->channel_list;  in acquire_unused_channel()
100 	unsigned int max_channels = host->info->nb_channels;  in acquire_unused_channel()
103 	index = find_first_zero_bit(chlist->allocated_channels, max_channels);  in acquire_unused_channel()
105 		dev_err(host->dev, "failed to find free channel\n");  in acquire_unused_channel()
109 	chlist->channels[index].id = index;  in acquire_unused_channel()
111 	set_bit(index, chlist->allocated_channels);  in acquire_unused_channel()
113 	return &chlist->channels[index];  in acquire_unused_channel()
117  * host1x_channel_request() - Allocate a channel
125 	struct host1x *host = dev_get_drvdata(client->dev->parent);  in host1x_channel_request()  local
126 	struct host1x_channel_list *chlist = &host->channel_list;  in host1x_channel_request()
130 	channel = acquire_unused_channel(host);  in host1x_channel_request()
134 	kref_init(&channel->refcount);  in host1x_channel_request()
135 	mutex_init(&channel->submitlock);  in host1x_channel_request()
136 	channel->client = client;  in host1x_channel_request()
137 	channel->dev = client->dev;  in host1x_channel_request()
139 	err = host1x_hw_channel_init(host, channel, channel->id);  in host1x_channel_request()
143 	err = host1x_cdma_init(&channel->cdma);  in host1x_channel_request()
150 	clear_bit(channel->id, chlist->allocated_channels);  in host1x_channel_request()
152 	dev_err(client->dev, "failed to initialize channel\n");  in host1x_channel_request()