1 /*
2  * Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.
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  */
23 #include "qmgr.h"
24 
25 struct nvkm_falcon_qmgr_seq *
26 nvkm_falcon_qmgr_seq_acquire(struct nvkm_falcon_qmgr *qmgr)
27 {
28 	const struct nvkm_subdev *subdev = qmgr->falcon->owner;
29 	struct nvkm_falcon_qmgr_seq *seq;
30 	u32 index;
31 
32 	mutex_lock(&qmgr->seq.mutex);
33 	index = find_first_zero_bit(qmgr->seq.tbl, NVKM_FALCON_QMGR_SEQ_NUM);
34 	if (index >= NVKM_FALCON_QMGR_SEQ_NUM) {
35 		nvkm_error(subdev, "no free sequence available\n");
36 		mutex_unlock(&qmgr->seq.mutex);
37 		return ERR_PTR(-EAGAIN);
38 	}
39 
40 	set_bit(index, qmgr->seq.tbl);
41 	mutex_unlock(&qmgr->seq.mutex);
42 
43 	seq = &qmgr->seq.id[index];
44 	seq->state = SEQ_STATE_PENDING;
45 	return seq;
46 }
47 
48 void
49 nvkm_falcon_qmgr_seq_release(struct nvkm_falcon_qmgr *qmgr,
50 			     struct nvkm_falcon_qmgr_seq *seq)
51 {
52 	/* no need to acquire seq.mutex since clear_bit is atomic */
53 	seq->state = SEQ_STATE_FREE;
54 	seq->callback = NULL;
55 	reinit_completion(&seq->done);
56 	clear_bit(seq->id, qmgr->seq.tbl);
57 }
58 
59 void
60 nvkm_falcon_qmgr_del(struct nvkm_falcon_qmgr **pqmgr)
61 {
62 	struct nvkm_falcon_qmgr *qmgr = *pqmgr;
63 	if (qmgr) {
64 		kfree(*pqmgr);
65 		*pqmgr = NULL;
66 	}
67 }
68 
69 int
70 nvkm_falcon_qmgr_new(struct nvkm_falcon *falcon,
71 		     struct nvkm_falcon_qmgr **pqmgr)
72 {
73 	struct nvkm_falcon_qmgr *qmgr;
74 	int i;
75 
76 	if (!(qmgr = *pqmgr = kzalloc(sizeof(*qmgr), GFP_KERNEL)))
77 		return -ENOMEM;
78 
79 	qmgr->falcon = falcon;
80 	mutex_init(&qmgr->seq.mutex);
81 	for (i = 0; i < NVKM_FALCON_QMGR_SEQ_NUM; i++) {
82 		qmgr->seq.id[i].id = i;
83 		init_completion(&qmgr->seq.id[i].done);
84 	}
85 
86 	return 0;
87 }
88