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 static void
nvkm_falcon_msgq_open(struct nvkm_falcon_msgq * msgq)26 nvkm_falcon_msgq_open(struct nvkm_falcon_msgq *msgq)
27 {
28 spin_lock(&msgq->lock);
29 msgq->position = nvkm_falcon_rd32(msgq->qmgr->falcon, msgq->tail_reg);
30 }
31
32 static void
nvkm_falcon_msgq_close(struct nvkm_falcon_msgq * msgq,bool commit)33 nvkm_falcon_msgq_close(struct nvkm_falcon_msgq *msgq, bool commit)
34 {
35 struct nvkm_falcon *falcon = msgq->qmgr->falcon;
36
37 if (commit)
38 nvkm_falcon_wr32(falcon, msgq->tail_reg, msgq->position);
39
40 spin_unlock(&msgq->lock);
41 }
42
43 bool
nvkm_falcon_msgq_empty(struct nvkm_falcon_msgq * msgq)44 nvkm_falcon_msgq_empty(struct nvkm_falcon_msgq *msgq)
45 {
46 u32 head = nvkm_falcon_rd32(msgq->qmgr->falcon, msgq->head_reg);
47 u32 tail = nvkm_falcon_rd32(msgq->qmgr->falcon, msgq->tail_reg);
48 return head == tail;
49 }
50
51 static int
nvkm_falcon_msgq_pop(struct nvkm_falcon_msgq * msgq,void * data,u32 size)52 nvkm_falcon_msgq_pop(struct nvkm_falcon_msgq *msgq, void *data, u32 size)
53 {
54 struct nvkm_falcon *falcon = msgq->qmgr->falcon;
55 u32 head, tail, available;
56
57 head = nvkm_falcon_rd32(falcon, msgq->head_reg);
58 /* has the buffer looped? */
59 if (head < msgq->position)
60 msgq->position = msgq->offset;
61
62 tail = msgq->position;
63
64 available = head - tail;
65 if (size > available) {
66 FLCNQ_ERR(msgq, "requested %d bytes, but only %d available",
67 size, available);
68 return -EINVAL;
69 }
70
71 nvkm_falcon_pio_rd(falcon, 0, DMEM, tail, data, 0, size);
72 msgq->position += ALIGN(size, QUEUE_ALIGNMENT);
73 return 0;
74 }
75
76 static int
nvkm_falcon_msgq_read(struct nvkm_falcon_msgq * msgq,struct nvfw_falcon_msg * hdr)77 nvkm_falcon_msgq_read(struct nvkm_falcon_msgq *msgq, struct nvfw_falcon_msg *hdr)
78 {
79 int ret = 0;
80
81 nvkm_falcon_msgq_open(msgq);
82
83 if (nvkm_falcon_msgq_empty(msgq))
84 goto close;
85
86 ret = nvkm_falcon_msgq_pop(msgq, hdr, HDR_SIZE);
87 if (ret) {
88 FLCNQ_ERR(msgq, "failed to read message header");
89 goto close;
90 }
91
92 if (hdr->size > MSG_BUF_SIZE) {
93 FLCNQ_ERR(msgq, "message too big, %d bytes", hdr->size);
94 ret = -ENOSPC;
95 goto close;
96 }
97
98 if (hdr->size > HDR_SIZE) {
99 u32 read_size = hdr->size - HDR_SIZE;
100
101 ret = nvkm_falcon_msgq_pop(msgq, (hdr + 1), read_size);
102 if (ret) {
103 FLCNQ_ERR(msgq, "failed to read message data");
104 goto close;
105 }
106 }
107
108 ret = 1;
109 close:
110 nvkm_falcon_msgq_close(msgq, (ret >= 0));
111 return ret;
112 }
113
114 static int
nvkm_falcon_msgq_exec(struct nvkm_falcon_msgq * msgq,struct nvfw_falcon_msg * hdr)115 nvkm_falcon_msgq_exec(struct nvkm_falcon_msgq *msgq, struct nvfw_falcon_msg *hdr)
116 {
117 struct nvkm_falcon_qmgr_seq *seq;
118
119 seq = &msgq->qmgr->seq.id[hdr->seq_id];
120 if (seq->state != SEQ_STATE_USED && seq->state != SEQ_STATE_CANCELLED) {
121 FLCNQ_ERR(msgq, "message for unknown sequence %08x", seq->id);
122 return -EINVAL;
123 }
124
125 if (seq->state == SEQ_STATE_USED) {
126 if (seq->callback)
127 seq->result = seq->callback(seq->priv, hdr);
128 }
129
130 if (seq->async) {
131 nvkm_falcon_qmgr_seq_release(msgq->qmgr, seq);
132 return 0;
133 }
134
135 complete_all(&seq->done);
136 return 0;
137 }
138
139 void
nvkm_falcon_msgq_recv(struct nvkm_falcon_msgq * msgq)140 nvkm_falcon_msgq_recv(struct nvkm_falcon_msgq *msgq)
141 {
142 /*
143 * We are invoked from a worker thread, so normally we have plenty of
144 * stack space to work with.
145 */
146 u8 msg_buffer[MSG_BUF_SIZE];
147 struct nvfw_falcon_msg *hdr = (void *)msg_buffer;
148
149 while (nvkm_falcon_msgq_read(msgq, hdr) > 0)
150 nvkm_falcon_msgq_exec(msgq, hdr);
151 }
152
153 int
nvkm_falcon_msgq_recv_initmsg(struct nvkm_falcon_msgq * msgq,void * data,u32 size)154 nvkm_falcon_msgq_recv_initmsg(struct nvkm_falcon_msgq *msgq,
155 void *data, u32 size)
156 {
157 struct nvkm_falcon *falcon = msgq->qmgr->falcon;
158 struct nvfw_falcon_msg *hdr = data;
159 int ret;
160
161 msgq->head_reg = falcon->func->msgq.head;
162 msgq->tail_reg = falcon->func->msgq.tail;
163 msgq->offset = nvkm_falcon_rd32(falcon, falcon->func->msgq.tail);
164
165 nvkm_falcon_msgq_open(msgq);
166 ret = nvkm_falcon_msgq_pop(msgq, data, size);
167 if (ret == 0 && hdr->size != size) {
168 FLCN_ERR(falcon, "unexpected init message size %d vs %d",
169 hdr->size, size);
170 ret = -EINVAL;
171 }
172 nvkm_falcon_msgq_close(msgq, ret == 0);
173 return ret;
174 }
175
176 void
nvkm_falcon_msgq_init(struct nvkm_falcon_msgq * msgq,u32 index,u32 offset,u32 size)177 nvkm_falcon_msgq_init(struct nvkm_falcon_msgq *msgq,
178 u32 index, u32 offset, u32 size)
179 {
180 const struct nvkm_falcon_func *func = msgq->qmgr->falcon->func;
181
182 msgq->head_reg = func->msgq.head + index * func->msgq.stride;
183 msgq->tail_reg = func->msgq.tail + index * func->msgq.stride;
184 msgq->offset = offset;
185
186 FLCNQ_DBG(msgq, "initialised @ index %d offset 0x%08x size 0x%08x",
187 index, msgq->offset, size);
188 }
189
190 void
nvkm_falcon_msgq_del(struct nvkm_falcon_msgq ** pmsgq)191 nvkm_falcon_msgq_del(struct nvkm_falcon_msgq **pmsgq)
192 {
193 struct nvkm_falcon_msgq *msgq = *pmsgq;
194 if (msgq) {
195 kfree(*pmsgq);
196 *pmsgq = NULL;
197 }
198 }
199
200 int
nvkm_falcon_msgq_new(struct nvkm_falcon_qmgr * qmgr,const char * name,struct nvkm_falcon_msgq ** pmsgq)201 nvkm_falcon_msgq_new(struct nvkm_falcon_qmgr *qmgr, const char *name,
202 struct nvkm_falcon_msgq **pmsgq)
203 {
204 struct nvkm_falcon_msgq *msgq = *pmsgq;
205
206 if (!(msgq = *pmsgq = kzalloc(sizeof(*msgq), GFP_KERNEL)))
207 return -ENOMEM;
208
209 msgq->qmgr = qmgr;
210 msgq->name = name;
211 spin_lock_init(&msgq->lock);
212 return 0;
213 }
214