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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Tegra host1x Channel
4 *
5 * Copyright (c) 2010-2013, NVIDIA Corporation.
6 */
7
8#include <linux/slab.h>
9#include <linux/module.h>
10
11#include "channel.h"
12#include "dev.h"
13#include "job.h"
14
15/* Constructor for the host1x device list */
16int host1x_channel_list_init(struct host1x_channel_list *chlist,
17 unsigned int num_channels)
18{
19 chlist->channels = kcalloc(num_channels, sizeof(struct host1x_channel),
20 GFP_KERNEL);
21 if (!chlist->channels)
22 return -ENOMEM;
23
24 chlist->allocated_channels = bitmap_zalloc(num_channels, GFP_KERNEL);
25 if (!chlist->allocated_channels) {
26 kfree(chlist->channels);
27 return -ENOMEM;
28 }
29
30 mutex_init(&chlist->lock);
31
32 return 0;
33}
34
35void host1x_channel_list_free(struct host1x_channel_list *chlist)
36{
37 bitmap_free(chlist->allocated_channels);
38 kfree(chlist->channels);
39}
40
41int host1x_job_submit(struct host1x_job *job)
42{
43 struct host1x *host = dev_get_drvdata(job->channel->dev->parent);
44
45 return host1x_hw_channel_submit(host, job);
46}
47EXPORT_SYMBOL(host1x_job_submit);
48
49struct host1x_channel *host1x_channel_get(struct host1x_channel *channel)
50{
51 kref_get(&channel->refcount);
52
53 return channel;
54}
55EXPORT_SYMBOL(host1x_channel_get);
56
57/**
58 * host1x_channel_get_index() - Attempt to get channel reference by index
59 * @host: Host1x device object
60 * @index: Index of channel
61 *
62 * If channel number @index is currently allocated, increase its refcount
63 * and return a pointer to it. Otherwise, return NULL.
64 */
65struct host1x_channel *host1x_channel_get_index(struct host1x *host,
66 unsigned int index)
67{
68 struct host1x_channel *ch = &host->channel_list.channels[index];
69
70 if (!kref_get_unless_zero(&ch->refcount))
71 return NULL;
72
73 return ch;
74}
75
76void host1x_channel_stop(struct host1x_channel *channel)
77{
78 struct host1x *host = dev_get_drvdata(channel->dev->parent);
79
80 host1x_hw_cdma_stop(host, &channel->cdma);
81}
82EXPORT_SYMBOL(host1x_channel_stop);
83
84/**
85 * host1x_channel_stop_all() - disable CDMA on allocated channels
86 * @host: host1x instance
87 *
88 * Stop CDMA on allocated channels
89 */
90void host1x_channel_stop_all(struct host1x *host)
91{
92 struct host1x_channel_list *chlist = &host->channel_list;
93 int bit;
94
95 mutex_lock(&chlist->lock);
96
97 for_each_set_bit(bit, chlist->allocated_channels, host->info->nb_channels)
98 host1x_channel_stop(&chlist->channels[bit]);
99
100 mutex_unlock(&chlist->lock);
101}
102
103static void release_channel(struct kref *kref)
104{
105 struct host1x_channel *channel =
106 container_of(kref, struct host1x_channel, refcount);
107 struct host1x *host = dev_get_drvdata(channel->dev->parent);
108 struct host1x_channel_list *chlist = &host->channel_list;
109
110 host1x_hw_cdma_stop(host, &channel->cdma);
111 host1x_cdma_deinit(&channel->cdma);
112
113 clear_bit(channel->id, chlist->allocated_channels);
114}
115
116void host1x_channel_put(struct host1x_channel *channel)
117{
118 kref_put(&channel->refcount, release_channel);
119}
120EXPORT_SYMBOL(host1x_channel_put);
121
122static struct host1x_channel *acquire_unused_channel(struct host1x *host)
123{
124 struct host1x_channel_list *chlist = &host->channel_list;
125 unsigned int max_channels = host->info->nb_channels;
126 unsigned int index;
127
128 mutex_lock(&chlist->lock);
129
130 index = find_first_zero_bit(chlist->allocated_channels, max_channels);
131 if (index >= max_channels) {
132 mutex_unlock(&chlist->lock);
133 dev_err(host->dev, "failed to find free channel\n");
134 return NULL;
135 }
136
137 chlist->channels[index].id = index;
138
139 set_bit(index, chlist->allocated_channels);
140
141 mutex_unlock(&chlist->lock);
142
143 return &chlist->channels[index];
144}
145
146/**
147 * host1x_channel_request() - Allocate a channel
148 * @client: Host1x client this channel will be used to send commands to
149 *
150 * Allocates a new host1x channel for @client. May return NULL if CDMA
151 * initialization fails.
152 */
153struct host1x_channel *host1x_channel_request(struct host1x_client *client)
154{
155 struct host1x *host = dev_get_drvdata(client->dev->parent);
156 struct host1x_channel_list *chlist = &host->channel_list;
157 struct host1x_channel *channel;
158 int err;
159
160 channel = acquire_unused_channel(host);
161 if (!channel)
162 return NULL;
163
164 kref_init(&channel->refcount);
165 mutex_init(&channel->submitlock);
166 channel->client = client;
167 channel->dev = client->dev;
168
169 err = host1x_hw_channel_init(host, channel, channel->id);
170 if (err < 0)
171 goto fail;
172
173 err = host1x_cdma_init(&channel->cdma);
174 if (err < 0)
175 goto fail;
176
177 return channel;
178
179fail:
180 clear_bit(channel->id, chlist->allocated_channels);
181
182 dev_err(client->dev, "failed to initialize channel\n");
183
184 return NULL;
185}
186EXPORT_SYMBOL(host1x_channel_request);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Tegra host1x Channel
4 *
5 * Copyright (c) 2010-2013, NVIDIA Corporation.
6 */
7
8#include <linux/slab.h>
9#include <linux/module.h>
10
11#include "channel.h"
12#include "dev.h"
13#include "job.h"
14
15/* Constructor for the host1x device list */
16int host1x_channel_list_init(struct host1x_channel_list *chlist,
17 unsigned int num_channels)
18{
19 chlist->channels = kcalloc(num_channels, sizeof(struct host1x_channel),
20 GFP_KERNEL);
21 if (!chlist->channels)
22 return -ENOMEM;
23
24 chlist->allocated_channels =
25 kcalloc(BITS_TO_LONGS(num_channels), sizeof(unsigned long),
26 GFP_KERNEL);
27 if (!chlist->allocated_channels) {
28 kfree(chlist->channels);
29 return -ENOMEM;
30 }
31
32 bitmap_zero(chlist->allocated_channels, num_channels);
33
34 return 0;
35}
36
37void host1x_channel_list_free(struct host1x_channel_list *chlist)
38{
39 kfree(chlist->allocated_channels);
40 kfree(chlist->channels);
41}
42
43int host1x_job_submit(struct host1x_job *job)
44{
45 struct host1x *host = dev_get_drvdata(job->channel->dev->parent);
46
47 return host1x_hw_channel_submit(host, job);
48}
49EXPORT_SYMBOL(host1x_job_submit);
50
51struct host1x_channel *host1x_channel_get(struct host1x_channel *channel)
52{
53 kref_get(&channel->refcount);
54
55 return channel;
56}
57EXPORT_SYMBOL(host1x_channel_get);
58
59/**
60 * host1x_channel_get_index() - Attempt to get channel reference by index
61 * @host: Host1x device object
62 * @index: Index of channel
63 *
64 * If channel number @index is currently allocated, increase its refcount
65 * and return a pointer to it. Otherwise, return NULL.
66 */
67struct host1x_channel *host1x_channel_get_index(struct host1x *host,
68 unsigned int index)
69{
70 struct host1x_channel *ch = &host->channel_list.channels[index];
71
72 if (!kref_get_unless_zero(&ch->refcount))
73 return NULL;
74
75 return ch;
76}
77
78static void release_channel(struct kref *kref)
79{
80 struct host1x_channel *channel =
81 container_of(kref, struct host1x_channel, refcount);
82 struct host1x *host = dev_get_drvdata(channel->dev->parent);
83 struct host1x_channel_list *chlist = &host->channel_list;
84
85 host1x_hw_cdma_stop(host, &channel->cdma);
86 host1x_cdma_deinit(&channel->cdma);
87
88 clear_bit(channel->id, chlist->allocated_channels);
89}
90
91void host1x_channel_put(struct host1x_channel *channel)
92{
93 kref_put(&channel->refcount, release_channel);
94}
95EXPORT_SYMBOL(host1x_channel_put);
96
97static struct host1x_channel *acquire_unused_channel(struct host1x *host)
98{
99 struct host1x_channel_list *chlist = &host->channel_list;
100 unsigned int max_channels = host->info->nb_channels;
101 unsigned int index;
102
103 index = find_first_zero_bit(chlist->allocated_channels, max_channels);
104 if (index >= max_channels) {
105 dev_err(host->dev, "failed to find free channel\n");
106 return NULL;
107 }
108
109 chlist->channels[index].id = index;
110
111 set_bit(index, chlist->allocated_channels);
112
113 return &chlist->channels[index];
114}
115
116/**
117 * host1x_channel_request() - Allocate a channel
118 * @device: Host1x unit this channel will be used to send commands to
119 *
120 * Allocates a new host1x channel for @device. May return NULL if CDMA
121 * initialization fails.
122 */
123struct host1x_channel *host1x_channel_request(struct device *dev)
124{
125 struct host1x *host = dev_get_drvdata(dev->parent);
126 struct host1x_channel_list *chlist = &host->channel_list;
127 struct host1x_channel *channel;
128 int err;
129
130 channel = acquire_unused_channel(host);
131 if (!channel)
132 return NULL;
133
134 kref_init(&channel->refcount);
135 mutex_init(&channel->submitlock);
136 channel->dev = dev;
137
138 err = host1x_hw_channel_init(host, channel, channel->id);
139 if (err < 0)
140 goto fail;
141
142 err = host1x_cdma_init(&channel->cdma);
143 if (err < 0)
144 goto fail;
145
146 return channel;
147
148fail:
149 clear_bit(channel->id, chlist->allocated_channels);
150
151 dev_err(dev, "failed to initialize channel\n");
152
153 return NULL;
154}
155EXPORT_SYMBOL(host1x_channel_request);