1 /*
2  * Copyright 2017 Red Hat Inc.
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice shall be included in
12  * all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20  * OTHER DEALINGS IN THE SOFTWARE.
21  *
22  * Authors: Ben Skeggs <bskeggs@redhat.com>
23  */
24 #include "head.h"
25 
26 #include <core/client.h>
27 
28 #include <nvif/cl0046.h>
29 #include <nvif/unpack.h>
30 
31 struct nvkm_head *
32 nvkm_head_find(struct nvkm_disp *disp, int id)
33 {
34 	struct nvkm_head *head;
35 	list_for_each_entry(head, &disp->heads, head) {
36 		if (head->id == id)
37 			return head;
38 	}
39 	return NULL;
40 }
41 
42 void
43 nvkm_head_del(struct nvkm_head **phead)
44 {
45 	struct nvkm_head *head = *phead;
46 	if (head) {
47 		HEAD_DBG(head, "dtor");
48 		list_del(&head->head);
49 		kfree(*phead);
50 		*phead = NULL;
51 	}
52 }
53 
54 int
55 nvkm_head_new_(const struct nvkm_head_func *func,
56 	       struct nvkm_disp *disp, int id)
57 {
58 	struct nvkm_head *head;
59 	if (!(head = kzalloc(sizeof(*head), GFP_KERNEL)))
60 		return -ENOMEM;
61 	head->func = func;
62 	head->disp = disp;
63 	head->id = id;
64 	list_add_tail(&head->head, &disp->heads);
65 	HEAD_DBG(head, "ctor");
66 	return 0;
67 }
68