dt-bindings: reset: imx7: Fix the spelling of 'indices'
[sfrench/cifs-2.6.git] / drivers / gpu / drm / msm / msm_submitqueue.c
1 /* Copyright (c) 2017 The Linux Foundation. All rights reserved.
2  *
3  * This program is free software; you can redistribute it and/or modify
4  * it under the terms of the GNU General Public License version 2 and
5  * only version 2 as published by the Free Software Foundation.
6  *
7  * This program is distributed in the hope that it will be useful,
8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
10  * GNU General Public License for more details.
11  *
12  */
13
14 #include <linux/kref.h>
15 #include "msm_gpu.h"
16
17 void msm_submitqueue_destroy(struct kref *kref)
18 {
19         struct msm_gpu_submitqueue *queue = container_of(kref,
20                 struct msm_gpu_submitqueue, ref);
21
22         kfree(queue);
23 }
24
25 struct msm_gpu_submitqueue *msm_submitqueue_get(struct msm_file_private *ctx,
26                 u32 id)
27 {
28         struct msm_gpu_submitqueue *entry;
29
30         if (!ctx)
31                 return NULL;
32
33         read_lock(&ctx->queuelock);
34
35         list_for_each_entry(entry, &ctx->submitqueues, node) {
36                 if (entry->id == id) {
37                         kref_get(&entry->ref);
38                         read_unlock(&ctx->queuelock);
39
40                         return entry;
41                 }
42         }
43
44         read_unlock(&ctx->queuelock);
45         return NULL;
46 }
47
48 void msm_submitqueue_close(struct msm_file_private *ctx)
49 {
50         struct msm_gpu_submitqueue *entry, *tmp;
51
52         if (!ctx)
53                 return;
54
55         /*
56          * No lock needed in close and there won't
57          * be any more user ioctls coming our way
58          */
59         list_for_each_entry_safe(entry, tmp, &ctx->submitqueues, node)
60                 msm_submitqueue_put(entry);
61 }
62
63 int msm_submitqueue_create(struct drm_device *drm, struct msm_file_private *ctx,
64                 u32 prio, u32 flags, u32 *id)
65 {
66         struct msm_drm_private *priv = drm->dev_private;
67         struct msm_gpu_submitqueue *queue;
68
69         if (!ctx)
70                 return -ENODEV;
71
72         queue = kzalloc(sizeof(*queue), GFP_KERNEL);
73
74         if (!queue)
75                 return -ENOMEM;
76
77         kref_init(&queue->ref);
78         queue->flags = flags;
79
80         if (priv->gpu) {
81                 if (prio >= priv->gpu->nr_rings)
82                         return -EINVAL;
83
84                 queue->prio = prio;
85         }
86
87         write_lock(&ctx->queuelock);
88
89         queue->id = ctx->queueid++;
90
91         if (id)
92                 *id = queue->id;
93
94         list_add_tail(&queue->node, &ctx->submitqueues);
95
96         write_unlock(&ctx->queuelock);
97
98         return 0;
99 }
100
101 int msm_submitqueue_init(struct drm_device *drm, struct msm_file_private *ctx)
102 {
103         struct msm_drm_private *priv = drm->dev_private;
104         int default_prio;
105
106         if (!ctx)
107                 return 0;
108
109         /*
110          * Select priority 2 as the "default priority" unless nr_rings is less
111          * than 2 and then pick the lowest pirority
112          */
113         default_prio = priv->gpu ?
114                 clamp_t(uint32_t, 2, 0, priv->gpu->nr_rings - 1) : 0;
115
116         INIT_LIST_HEAD(&ctx->submitqueues);
117
118         rwlock_init(&ctx->queuelock);
119
120         return msm_submitqueue_create(drm, ctx, default_prio, 0, NULL);
121 }
122
123 static int msm_submitqueue_query_faults(struct msm_gpu_submitqueue *queue,
124                 struct drm_msm_submitqueue_query *args)
125 {
126         size_t size = min_t(size_t, args->len, sizeof(queue->faults));
127         int ret;
128
129         /* If a zero length was passed in, return the data size we expect */
130         if (!args->len) {
131                 args->len = sizeof(queue->faults);
132                 return 0;
133         }
134
135         /* Set the length to the actual size of the data */
136         args->len = size;
137
138         ret = copy_to_user(u64_to_user_ptr(args->data), &queue->faults, size);
139
140         return ret ? -EFAULT : 0;
141 }
142
143 int msm_submitqueue_query(struct drm_device *drm, struct msm_file_private *ctx,
144                 struct drm_msm_submitqueue_query *args)
145 {
146         struct msm_gpu_submitqueue *queue;
147         int ret = -EINVAL;
148
149         if (args->pad)
150                 return -EINVAL;
151
152         queue = msm_submitqueue_get(ctx, args->id);
153         if (!queue)
154                 return -ENOENT;
155
156         if (args->param == MSM_SUBMITQUEUE_PARAM_FAULTS)
157                 ret = msm_submitqueue_query_faults(queue, args);
158
159         msm_submitqueue_put(queue);
160
161         return ret;
162 }
163
164 int msm_submitqueue_remove(struct msm_file_private *ctx, u32 id)
165 {
166         struct msm_gpu_submitqueue *entry;
167
168         if (!ctx)
169                 return 0;
170
171         /*
172          * id 0 is the "default" queue and can't be destroyed
173          * by the user
174          */
175         if (!id)
176                 return -ENOENT;
177
178         write_lock(&ctx->queuelock);
179
180         list_for_each_entry(entry, &ctx->submitqueues, node) {
181                 if (entry->id == id) {
182                         list_del(&entry->node);
183                         write_unlock(&ctx->queuelock);
184
185                         msm_submitqueue_put(entry);
186                         return 0;
187                 }
188         }
189
190         write_unlock(&ctx->queuelock);
191         return -ENOENT;
192 }
193