1 // SPDX-License-Identifier: GPL-2.0-only
3  * Tegra host1x Channel
5  * Copyright (c) 2010-2013, NVIDIA Corporation.
11 #include "channel.h"
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 = bitmap_zalloc(num_channels, GFP_KERNEL);  in host1x_channel_list_init()
25 	if (!chlist->allocated_channels) {  in host1x_channel_list_init()
26 		kfree(chlist->channels);  in host1x_channel_list_init()
27 		return -ENOMEM;  in host1x_channel_list_init()
30 	mutex_init(&chlist->lock);  in host1x_channel_list_init()
37 	bitmap_free(chlist->allocated_channels);  in host1x_channel_list_free()
38 	kfree(chlist->channels);  in host1x_channel_list_free()
43 	struct host1x *host = dev_get_drvdata(job->channel->dev->parent);  in host1x_job_submit()
49 struct host1x_channel *host1x_channel_get(struct host1x_channel *channel)  in host1x_channel_get()  argument
51 	kref_get(&channel->refcount);  in host1x_channel_get()
53 	return channel;  in host1x_channel_get()
58  * host1x_channel_get_index() - Attempt to get channel reference by index
60  * @index: Index of channel
62  * If channel number @index is currently allocated, increase its refcount
68 	struct host1x_channel *ch = &host->channel_list.channels[index];  in host1x_channel_get_index()
70 	if (!kref_get_unless_zero(&ch->refcount))  in host1x_channel_get_index()
76 void host1x_channel_stop(struct host1x_channel *channel)  in host1x_channel_stop()  argument
78 	struct host1x *host = dev_get_drvdata(channel->dev->parent);  in host1x_channel_stop()
80 	host1x_hw_cdma_stop(host, &channel->cdma);  in host1x_channel_stop()
85  * host1x_channel_stop_all() - disable CDMA on allocated channels
92 	struct host1x_channel_list *chlist = &host->channel_list;  in host1x_channel_stop_all()
95 	mutex_lock(&chlist->lock);  in host1x_channel_stop_all()
97 	for_each_set_bit(bit, chlist->allocated_channels, host->info->nb_channels)  in host1x_channel_stop_all()
98 		host1x_channel_stop(&chlist->channels[bit]);  in host1x_channel_stop_all()
100 	mutex_unlock(&chlist->lock);  in host1x_channel_stop_all()
105 	struct host1x_channel *channel =  in release_channel()  local
107 	struct host1x *host = dev_get_drvdata(channel->dev->parent);  in release_channel()
108 	struct host1x_channel_list *chlist = &host->channel_list;  in release_channel()
110 	host1x_hw_cdma_stop(host, &channel->cdma);  in release_channel()
111 	host1x_cdma_deinit(&channel->cdma);  in release_channel()
113 	clear_bit(channel->id, chlist->allocated_channels);  in release_channel()
116 void host1x_channel_put(struct host1x_channel *channel)  in host1x_channel_put()  argument
118 	kref_put(&channel->refcount, release_channel);  in host1x_channel_put()
124 	struct host1x_channel_list *chlist = &host->channel_list;  in acquire_unused_channel()
125 	unsigned int max_channels = host->info->nb_channels;  in acquire_unused_channel()
128 	mutex_lock(&chlist->lock);  in acquire_unused_channel()
130 	index = find_first_zero_bit(chlist->allocated_channels, max_channels);  in acquire_unused_channel()
132 		mutex_unlock(&chlist->lock);  in acquire_unused_channel()
133 		dev_err(host->dev, "failed to find free channel\n");  in acquire_unused_channel()
137 	chlist->channels[index].id = index;  in acquire_unused_channel()
139 	set_bit(index, chlist->allocated_channels);  in acquire_unused_channel()
141 	mutex_unlock(&chlist->lock);  in acquire_unused_channel()
143 	return &chlist->channels[index];  in acquire_unused_channel()
147  * host1x_channel_request() - Allocate a channel
148  * @client: Host1x client this channel will be used to send commands to
150  * Allocates a new host1x channel for @client. May return NULL if CDMA
155 	struct host1x *host = dev_get_drvdata(client->dev->parent);  in host1x_channel_request()
156 	struct host1x_channel_list *chlist = &host->channel_list;  in host1x_channel_request()
157 	struct host1x_channel *channel;  in host1x_channel_request()  local
160 	channel = acquire_unused_channel(host);  in host1x_channel_request()
161 	if (!channel)  in host1x_channel_request()
164 	kref_init(&channel->refcount);  in host1x_channel_request()
165 	mutex_init(&channel->submitlock);  in host1x_channel_request()
166 	channel->client = client;  in host1x_channel_request()
167 	channel->dev = client->dev;  in host1x_channel_request()
169 	err = host1x_hw_channel_init(host, channel, channel->id);  in host1x_channel_request()
173 	err = host1x_cdma_init(&channel->cdma);  in host1x_channel_request()
177 	return channel;  in host1x_channel_request()
180 	clear_bit(channel->id, chlist->allocated_channels);  in host1x_channel_request()
182 	dev_err(client->dev, "failed to initialize channel\n");  in host1x_channel_request()