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9952f691 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
6579324a TB |
2 | /* |
3 | * Tegra host1x Channel | |
4 | * | |
5 | * Copyright (c) 2010-2013, NVIDIA Corporation. | |
6579324a TB |
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 */ | |
8474b025 MP |
16 | int host1x_channel_list_init(struct host1x_channel_list *chlist, |
17 | unsigned int num_channels) | |
6579324a | 18 | { |
8474b025 MP |
19 | chlist->channels = kcalloc(num_channels, sizeof(struct host1x_channel), |
20 | GFP_KERNEL); | |
21 | if (!chlist->channels) | |
22 | return -ENOMEM; | |
23 | ||
2e1bfb31 | 24 | chlist->allocated_channels = bitmap_zalloc(num_channels, GFP_KERNEL); |
8474b025 MP |
25 | if (!chlist->allocated_channels) { |
26 | kfree(chlist->channels); | |
27 | return -ENOMEM; | |
6579324a TB |
28 | } |
29 | ||
9764723d MP |
30 | mutex_init(&chlist->lock); |
31 | ||
6579324a TB |
32 | return 0; |
33 | } | |
34 | ||
8474b025 MP |
35 | void host1x_channel_list_free(struct host1x_channel_list *chlist) |
36 | { | |
2e1bfb31 | 37 | bitmap_free(chlist->allocated_channels); |
8474b025 MP |
38 | kfree(chlist->channels); |
39 | } | |
40 | ||
6579324a TB |
41 | int 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 | } | |
fae798a1 | 47 | EXPORT_SYMBOL(host1x_job_submit); |
6579324a TB |
48 | |
49 | struct host1x_channel *host1x_channel_get(struct host1x_channel *channel) | |
50 | { | |
8474b025 | 51 | kref_get(&channel->refcount); |
6579324a | 52 | |
8474b025 MP |
53 | return channel; |
54 | } | |
55 | EXPORT_SYMBOL(host1x_channel_get); | |
6579324a | 56 | |
8474b025 MP |
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 | */ | |
65 | struct host1x_channel *host1x_channel_get_index(struct host1x *host, | |
66 | unsigned int index) | |
67 | { | |
68 | struct host1x_channel *ch = &host->channel_list.channels[index]; | |
6579324a | 69 | |
8474b025 MP |
70 | if (!kref_get_unless_zero(&ch->refcount)) |
71 | return NULL; | |
6579324a | 72 | |
8474b025 MP |
73 | return ch; |
74 | } | |
75 | ||
9ca790f4 DO |
76 | void 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 | } | |
82 | EXPORT_SYMBOL(host1x_channel_stop); | |
83 | ||
8474b025 MP |
84 | static void release_channel(struct kref *kref) |
85 | { | |
86 | struct host1x_channel *channel = | |
87 | container_of(kref, struct host1x_channel, refcount); | |
88 | struct host1x *host = dev_get_drvdata(channel->dev->parent); | |
89 | struct host1x_channel_list *chlist = &host->channel_list; | |
90 | ||
91 | host1x_hw_cdma_stop(host, &channel->cdma); | |
92 | host1x_cdma_deinit(&channel->cdma); | |
6579324a | 93 | |
8474b025 | 94 | clear_bit(channel->id, chlist->allocated_channels); |
6579324a TB |
95 | } |
96 | ||
97 | void host1x_channel_put(struct host1x_channel *channel) | |
98 | { | |
8474b025 MP |
99 | kref_put(&channel->refcount, release_channel); |
100 | } | |
101 | EXPORT_SYMBOL(host1x_channel_put); | |
6579324a | 102 | |
8474b025 MP |
103 | static struct host1x_channel *acquire_unused_channel(struct host1x *host) |
104 | { | |
105 | struct host1x_channel_list *chlist = &host->channel_list; | |
106 | unsigned int max_channels = host->info->nb_channels; | |
107 | unsigned int index; | |
6579324a | 108 | |
9764723d MP |
109 | mutex_lock(&chlist->lock); |
110 | ||
8474b025 MP |
111 | index = find_first_zero_bit(chlist->allocated_channels, max_channels); |
112 | if (index >= max_channels) { | |
9764723d | 113 | mutex_unlock(&chlist->lock); |
8474b025 MP |
114 | dev_err(host->dev, "failed to find free channel\n"); |
115 | return NULL; | |
6579324a TB |
116 | } |
117 | ||
8474b025 | 118 | chlist->channels[index].id = index; |
6579324a | 119 | |
8474b025 MP |
120 | set_bit(index, chlist->allocated_channels); |
121 | ||
9764723d MP |
122 | mutex_unlock(&chlist->lock); |
123 | ||
8474b025 | 124 | return &chlist->channels[index]; |
6579324a TB |
125 | } |
126 | ||
8474b025 MP |
127 | /** |
128 | * host1x_channel_request() - Allocate a channel | |
caccddcf | 129 | * @client: Host1x client this channel will be used to send commands to |
8474b025 | 130 | * |
caccddcf | 131 | * Allocates a new host1x channel for @client. May return NULL if CDMA |
8474b025 MP |
132 | * initialization fails. |
133 | */ | |
caccddcf | 134 | struct host1x_channel *host1x_channel_request(struct host1x_client *client) |
6579324a | 135 | { |
caccddcf | 136 | struct host1x *host = dev_get_drvdata(client->dev->parent); |
8474b025 MP |
137 | struct host1x_channel_list *chlist = &host->channel_list; |
138 | struct host1x_channel *channel; | |
e18e33af | 139 | int err; |
6579324a | 140 | |
8474b025 MP |
141 | channel = acquire_unused_channel(host); |
142 | if (!channel) | |
143 | return NULL; | |
6579324a | 144 | |
8474b025 MP |
145 | kref_init(&channel->refcount); |
146 | mutex_init(&channel->submitlock); | |
caccddcf TR |
147 | channel->client = client; |
148 | channel->dev = client->dev; | |
6579324a | 149 | |
8474b025 MP |
150 | err = host1x_hw_channel_init(host, channel, channel->id); |
151 | if (err < 0) | |
6579324a TB |
152 | goto fail; |
153 | ||
8474b025 | 154 | err = host1x_cdma_init(&channel->cdma); |
6579324a TB |
155 | if (err < 0) |
156 | goto fail; | |
157 | ||
6579324a TB |
158 | return channel; |
159 | ||
160 | fail: | |
8474b025 | 161 | clear_bit(channel->id, chlist->allocated_channels); |
6579324a | 162 | |
caccddcf | 163 | dev_err(client->dev, "failed to initialize channel\n"); |
6579324a | 164 | |
8474b025 | 165 | return NULL; |
6579324a | 166 | } |
8474b025 | 167 | EXPORT_SYMBOL(host1x_channel_request); |