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84369fbe | 1 | // SPDX-License-Identifier: GPL-2.0 |
835764dd BA |
2 | /* |
3 | * Copyright (c) 2016-2017, Linaro Ltd | |
835764dd BA |
4 | */ |
5 | ||
6 | #include <linux/idr.h> | |
7 | #include <linux/interrupt.h> | |
8 | #include <linux/io.h> | |
9 | #include <linux/list.h> | |
10 | #include <linux/mfd/syscon.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/of.h> | |
13 | #include <linux/of_address.h> | |
14 | #include <linux/of_irq.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/regmap.h> | |
17 | #include <linux/rpmsg.h> | |
6bf68cbd | 18 | #include <linux/sizes.h> |
835764dd BA |
19 | #include <linux/slab.h> |
20 | #include <linux/workqueue.h> | |
21 | #include <linux/mailbox_client.h> | |
22 | ||
23 | #include "rpmsg_internal.h" | |
24 | #include "qcom_glink_native.h" | |
25 | ||
26 | #define GLINK_NAME_SIZE 32 | |
d31ad615 | 27 | #define GLINK_VERSION_1 1 |
835764dd BA |
28 | |
29 | #define RPM_GLINK_CID_MIN 1 | |
30 | #define RPM_GLINK_CID_MAX 65536 | |
31 | ||
32 | struct glink_msg { | |
33 | __le16 cmd; | |
34 | __le16 param1; | |
35 | __le32 param2; | |
36 | u8 data[]; | |
37 | } __packed; | |
38 | ||
39 | /** | |
40 | * struct glink_defer_cmd - deferred incoming control message | |
41 | * @node: list node | |
42 | * @msg: message header | |
6f0b9584 | 43 | * @data: payload of the message |
835764dd BA |
44 | * |
45 | * Copy of a received control message, to be added to @rx_queue and processed | |
46 | * by @rx_work of @qcom_glink. | |
47 | */ | |
48 | struct glink_defer_cmd { | |
49 | struct list_head node; | |
50 | ||
51 | struct glink_msg msg; | |
52 | u8 data[]; | |
53 | }; | |
54 | ||
933b45da S |
55 | /** |
56 | * struct glink_core_rx_intent - RX intent | |
57 | * RX intent | |
58 | * | |
6f0b9584 SK |
59 | * @data: pointer to the data (may be NULL for zero-copy) |
60 | * @id: remote or local intent ID | |
61 | * @size: size of the original intent (do not modify) | |
62 | * @reuse: To mark if the intent can be reused after first use | |
63 | * @in_use: To mark if intent is already in use for the channel | |
64 | * @offset: next write offset (initially 0) | |
65 | * @node: list node | |
933b45da S |
66 | */ |
67 | struct glink_core_rx_intent { | |
68 | void *data; | |
69 | u32 id; | |
70 | size_t size; | |
71 | bool reuse; | |
72 | bool in_use; | |
73 | u32 offset; | |
1d2ea36e S |
74 | |
75 | struct list_head node; | |
933b45da S |
76 | }; |
77 | ||
835764dd BA |
78 | /** |
79 | * struct qcom_glink - driver context, relates to one remote subsystem | |
80 | * @dev: reference to the associated struct device | |
81 | * @mbox_client: mailbox client | |
82 | * @mbox_chan: mailbox channel | |
83 | * @rx_pipe: pipe object for receive FIFO | |
84 | * @tx_pipe: pipe object for transmit FIFO | |
85 | * @irq: IRQ for signaling incoming events | |
86 | * @rx_work: worker for handling received control messages | |
87 | * @rx_lock: protects the @rx_queue | |
88 | * @rx_queue: queue of received control messages to be processed in @rx_work | |
89 | * @tx_lock: synchronizes operations on the tx fifo | |
90 | * @idr_lock: synchronizes @lcids and @rcids modifications | |
91 | * @lcids: idr of all channels with a known local channel id | |
92 | * @rcids: idr of all channels with a known remote channel id | |
6f0b9584 SK |
93 | * @features: remote features |
94 | * @intentless: flag to indicate that there is no intent | |
835764dd BA |
95 | */ |
96 | struct qcom_glink { | |
97 | struct device *dev; | |
98 | ||
475452fc CL |
99 | const char *name; |
100 | ||
835764dd BA |
101 | struct mbox_client mbox_client; |
102 | struct mbox_chan *mbox_chan; | |
103 | ||
104 | struct qcom_glink_pipe *rx_pipe; | |
105 | struct qcom_glink_pipe *tx_pipe; | |
106 | ||
107 | int irq; | |
108 | ||
109 | struct work_struct rx_work; | |
110 | spinlock_t rx_lock; | |
111 | struct list_head rx_queue; | |
112 | ||
29fc9b38 | 113 | spinlock_t tx_lock; |
835764dd | 114 | |
44f6df92 | 115 | spinlock_t idr_lock; |
835764dd BA |
116 | struct idr lcids; |
117 | struct idr rcids; | |
d31ad615 S |
118 | unsigned long features; |
119 | ||
120 | bool intentless; | |
835764dd BA |
121 | }; |
122 | ||
123 | enum { | |
124 | GLINK_STATE_CLOSED, | |
125 | GLINK_STATE_OPENING, | |
126 | GLINK_STATE_OPEN, | |
127 | GLINK_STATE_CLOSING, | |
128 | }; | |
129 | ||
130 | /** | |
131 | * struct glink_channel - internal representation of a channel | |
132 | * @rpdev: rpdev reference, only used for primary endpoints | |
133 | * @ept: rpmsg endpoint this channel is associated with | |
134 | * @glink: qcom_glink context handle | |
135 | * @refcount: refcount for the channel object | |
136 | * @recv_lock: guard for @ept.cb | |
137 | * @name: unique channel name/identifier | |
138 | * @lcid: channel id, in local space | |
139 | * @rcid: channel id, in remote space | |
dacbb35e | 140 | * @intent_lock: lock for protection of @liids, @riids |
933b45da | 141 | * @liids: idr of all local intents |
dacbb35e | 142 | * @riids: idr of all remote intents |
1d2ea36e S |
143 | * @intent_work: worker responsible for transmitting rx_done packets |
144 | * @done_intents: list of intents that needs to be announced rx_done | |
835764dd BA |
145 | * @buf: receive buffer, for gathering fragments |
146 | * @buf_offset: write offset in @buf | |
147 | * @buf_size: size of current @buf | |
148 | * @open_ack: completed once remote has acked the open-request | |
149 | * @open_req: completed once open-request has been received | |
27b9c5b6 S |
150 | * @intent_req_lock: Synchronises multiple intent requests |
151 | * @intent_req_result: Result of intent request | |
152 | * @intent_req_comp: Completion for intent_req signalling | |
835764dd BA |
153 | */ |
154 | struct glink_channel { | |
155 | struct rpmsg_endpoint ept; | |
156 | ||
157 | struct rpmsg_device *rpdev; | |
158 | struct qcom_glink *glink; | |
159 | ||
160 | struct kref refcount; | |
161 | ||
162 | spinlock_t recv_lock; | |
163 | ||
164 | char *name; | |
165 | unsigned int lcid; | |
166 | unsigned int rcid; | |
167 | ||
933b45da S |
168 | spinlock_t intent_lock; |
169 | struct idr liids; | |
dacbb35e | 170 | struct idr riids; |
1d2ea36e S |
171 | struct work_struct intent_work; |
172 | struct list_head done_intents; | |
933b45da | 173 | |
64f95f87 | 174 | struct glink_core_rx_intent *buf; |
835764dd BA |
175 | int buf_offset; |
176 | int buf_size; | |
177 | ||
178 | struct completion open_ack; | |
179 | struct completion open_req; | |
27b9c5b6 S |
180 | |
181 | struct mutex intent_req_lock; | |
182 | bool intent_req_result; | |
183 | struct completion intent_req_comp; | |
835764dd BA |
184 | }; |
185 | ||
186 | #define to_glink_channel(_ept) container_of(_ept, struct glink_channel, ept) | |
187 | ||
188 | static const struct rpmsg_endpoint_ops glink_endpoint_ops; | |
189 | ||
190 | #define RPM_CMD_VERSION 0 | |
191 | #define RPM_CMD_VERSION_ACK 1 | |
192 | #define RPM_CMD_OPEN 2 | |
193 | #define RPM_CMD_CLOSE 3 | |
194 | #define RPM_CMD_OPEN_ACK 4 | |
933b45da | 195 | #define RPM_CMD_INTENT 5 |
1d2ea36e | 196 | #define RPM_CMD_RX_DONE 6 |
933b45da S |
197 | #define RPM_CMD_RX_INTENT_REQ 7 |
198 | #define RPM_CMD_RX_INTENT_REQ_ACK 8 | |
835764dd BA |
199 | #define RPM_CMD_TX_DATA 9 |
200 | #define RPM_CMD_CLOSE_ACK 11 | |
201 | #define RPM_CMD_TX_DATA_CONT 12 | |
202 | #define RPM_CMD_READ_NOTIF 13 | |
1d2ea36e | 203 | #define RPM_CMD_RX_DONE_W_REUSE 14 |
835764dd BA |
204 | |
205 | #define GLINK_FEATURE_INTENTLESS BIT(1) | |
206 | ||
1d2ea36e S |
207 | static void qcom_glink_rx_done_work(struct work_struct *work); |
208 | ||
835764dd BA |
209 | static struct glink_channel *qcom_glink_alloc_channel(struct qcom_glink *glink, |
210 | const char *name) | |
211 | { | |
212 | struct glink_channel *channel; | |
213 | ||
214 | channel = kzalloc(sizeof(*channel), GFP_KERNEL); | |
215 | if (!channel) | |
216 | return ERR_PTR(-ENOMEM); | |
217 | ||
218 | /* Setup glink internal glink_channel data */ | |
219 | spin_lock_init(&channel->recv_lock); | |
933b45da | 220 | spin_lock_init(&channel->intent_lock); |
fb416f69 | 221 | mutex_init(&channel->intent_req_lock); |
1d2ea36e | 222 | |
835764dd BA |
223 | channel->glink = glink; |
224 | channel->name = kstrdup(name, GFP_KERNEL); | |
225 | ||
226 | init_completion(&channel->open_req); | |
227 | init_completion(&channel->open_ack); | |
2394facb | 228 | init_completion(&channel->intent_req_comp); |
835764dd | 229 | |
1d2ea36e S |
230 | INIT_LIST_HEAD(&channel->done_intents); |
231 | INIT_WORK(&channel->intent_work, qcom_glink_rx_done_work); | |
232 | ||
933b45da | 233 | idr_init(&channel->liids); |
dacbb35e | 234 | idr_init(&channel->riids); |
835764dd BA |
235 | kref_init(&channel->refcount); |
236 | ||
237 | return channel; | |
238 | } | |
239 | ||
240 | static void qcom_glink_channel_release(struct kref *ref) | |
241 | { | |
242 | struct glink_channel *channel = container_of(ref, struct glink_channel, | |
243 | refcount); | |
b85f6b60 | 244 | struct glink_core_rx_intent *tmp; |
933b45da | 245 | unsigned long flags; |
b85f6b60 | 246 | int iid; |
933b45da S |
247 | |
248 | spin_lock_irqsave(&channel->intent_lock, flags); | |
b85f6b60 AKN |
249 | idr_for_each_entry(&channel->liids, tmp, iid) { |
250 | kfree(tmp->data); | |
251 | kfree(tmp); | |
252 | } | |
933b45da | 253 | idr_destroy(&channel->liids); |
b85f6b60 AKN |
254 | |
255 | idr_for_each_entry(&channel->riids, tmp, iid) | |
256 | kfree(tmp); | |
dacbb35e | 257 | idr_destroy(&channel->riids); |
933b45da | 258 | spin_unlock_irqrestore(&channel->intent_lock, flags); |
835764dd BA |
259 | |
260 | kfree(channel->name); | |
261 | kfree(channel); | |
262 | } | |
263 | ||
264 | static size_t qcom_glink_rx_avail(struct qcom_glink *glink) | |
265 | { | |
266 | return glink->rx_pipe->avail(glink->rx_pipe); | |
267 | } | |
268 | ||
269 | static void qcom_glink_rx_peak(struct qcom_glink *glink, | |
b88eee97 | 270 | void *data, unsigned int offset, size_t count) |
835764dd | 271 | { |
b88eee97 | 272 | glink->rx_pipe->peak(glink->rx_pipe, data, offset, count); |
835764dd BA |
273 | } |
274 | ||
275 | static void qcom_glink_rx_advance(struct qcom_glink *glink, size_t count) | |
276 | { | |
277 | glink->rx_pipe->advance(glink->rx_pipe, count); | |
278 | } | |
279 | ||
280 | static size_t qcom_glink_tx_avail(struct qcom_glink *glink) | |
281 | { | |
282 | return glink->tx_pipe->avail(glink->tx_pipe); | |
283 | } | |
284 | ||
285 | static void qcom_glink_tx_write(struct qcom_glink *glink, | |
286 | const void *hdr, size_t hlen, | |
287 | const void *data, size_t dlen) | |
288 | { | |
289 | glink->tx_pipe->write(glink->tx_pipe, hdr, hlen, data, dlen); | |
290 | } | |
291 | ||
292 | static int qcom_glink_tx(struct qcom_glink *glink, | |
293 | const void *hdr, size_t hlen, | |
294 | const void *data, size_t dlen, bool wait) | |
295 | { | |
296 | unsigned int tlen = hlen + dlen; | |
29fc9b38 BA |
297 | unsigned long flags; |
298 | int ret = 0; | |
835764dd BA |
299 | |
300 | /* Reject packets that are too big */ | |
301 | if (tlen >= glink->tx_pipe->length) | |
302 | return -EINVAL; | |
303 | ||
29fc9b38 | 304 | spin_lock_irqsave(&glink->tx_lock, flags); |
835764dd BA |
305 | |
306 | while (qcom_glink_tx_avail(glink) < tlen) { | |
307 | if (!wait) { | |
a7df9dfc | 308 | ret = -EAGAIN; |
835764dd BA |
309 | goto out; |
310 | } | |
311 | ||
29fc9b38 BA |
312 | /* Wait without holding the tx_lock */ |
313 | spin_unlock_irqrestore(&glink->tx_lock, flags); | |
314 | ||
835764dd | 315 | usleep_range(10000, 15000); |
29fc9b38 BA |
316 | |
317 | spin_lock_irqsave(&glink->tx_lock, flags); | |
835764dd BA |
318 | } |
319 | ||
320 | qcom_glink_tx_write(glink, hdr, hlen, data, dlen); | |
321 | ||
322 | mbox_send_message(glink->mbox_chan, NULL); | |
323 | mbox_client_txdone(glink->mbox_chan, 0); | |
324 | ||
325 | out: | |
29fc9b38 | 326 | spin_unlock_irqrestore(&glink->tx_lock, flags); |
835764dd BA |
327 | |
328 | return ret; | |
329 | } | |
330 | ||
331 | static int qcom_glink_send_version(struct qcom_glink *glink) | |
332 | { | |
333 | struct glink_msg msg; | |
334 | ||
335 | msg.cmd = cpu_to_le16(RPM_CMD_VERSION); | |
d31ad615 S |
336 | msg.param1 = cpu_to_le16(GLINK_VERSION_1); |
337 | msg.param2 = cpu_to_le32(glink->features); | |
835764dd BA |
338 | |
339 | return qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); | |
340 | } | |
341 | ||
342 | static void qcom_glink_send_version_ack(struct qcom_glink *glink) | |
343 | { | |
344 | struct glink_msg msg; | |
345 | ||
346 | msg.cmd = cpu_to_le16(RPM_CMD_VERSION_ACK); | |
d31ad615 S |
347 | msg.param1 = cpu_to_le16(GLINK_VERSION_1); |
348 | msg.param2 = cpu_to_le32(glink->features); | |
835764dd BA |
349 | |
350 | qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); | |
351 | } | |
352 | ||
353 | static void qcom_glink_send_open_ack(struct qcom_glink *glink, | |
354 | struct glink_channel *channel) | |
355 | { | |
356 | struct glink_msg msg; | |
357 | ||
358 | msg.cmd = cpu_to_le16(RPM_CMD_OPEN_ACK); | |
359 | msg.param1 = cpu_to_le16(channel->rcid); | |
360 | msg.param2 = cpu_to_le32(0); | |
361 | ||
362 | qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); | |
363 | } | |
364 | ||
27b9c5b6 S |
365 | static void qcom_glink_handle_intent_req_ack(struct qcom_glink *glink, |
366 | unsigned int cid, bool granted) | |
367 | { | |
368 | struct glink_channel *channel; | |
369 | unsigned long flags; | |
370 | ||
371 | spin_lock_irqsave(&glink->idr_lock, flags); | |
372 | channel = idr_find(&glink->rcids, cid); | |
373 | spin_unlock_irqrestore(&glink->idr_lock, flags); | |
374 | if (!channel) { | |
375 | dev_err(glink->dev, "unable to find channel\n"); | |
376 | return; | |
377 | } | |
378 | ||
379 | channel->intent_req_result = granted; | |
380 | complete(&channel->intent_req_comp); | |
381 | } | |
382 | ||
835764dd BA |
383 | /** |
384 | * qcom_glink_send_open_req() - send a RPM_CMD_OPEN request to the remote | |
385 | * @glink: Ptr to the glink edge | |
386 | * @channel: Ptr to the channel that the open req is sent | |
387 | * | |
388 | * Allocates a local channel id and sends a RPM_CMD_OPEN message to the remote. | |
389 | * Will return with refcount held, regardless of outcome. | |
390 | * | |
391 | * Returns 0 on success, negative errno otherwise. | |
392 | */ | |
393 | static int qcom_glink_send_open_req(struct qcom_glink *glink, | |
394 | struct glink_channel *channel) | |
395 | { | |
396 | struct { | |
397 | struct glink_msg msg; | |
398 | u8 name[GLINK_NAME_SIZE]; | |
399 | } __packed req; | |
400 | int name_len = strlen(channel->name) + 1; | |
401 | int req_len = ALIGN(sizeof(req.msg) + name_len, 8); | |
402 | int ret; | |
44f6df92 | 403 | unsigned long flags; |
835764dd BA |
404 | |
405 | kref_get(&channel->refcount); | |
406 | ||
44f6df92 | 407 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd BA |
408 | ret = idr_alloc_cyclic(&glink->lcids, channel, |
409 | RPM_GLINK_CID_MIN, RPM_GLINK_CID_MAX, | |
44f6df92 S |
410 | GFP_ATOMIC); |
411 | spin_unlock_irqrestore(&glink->idr_lock, flags); | |
835764dd BA |
412 | if (ret < 0) |
413 | return ret; | |
414 | ||
415 | channel->lcid = ret; | |
416 | ||
417 | req.msg.cmd = cpu_to_le16(RPM_CMD_OPEN); | |
418 | req.msg.param1 = cpu_to_le16(channel->lcid); | |
419 | req.msg.param2 = cpu_to_le32(name_len); | |
420 | strcpy(req.name, channel->name); | |
421 | ||
422 | ret = qcom_glink_tx(glink, &req, req_len, NULL, 0, true); | |
423 | if (ret) | |
424 | goto remove_idr; | |
425 | ||
426 | return 0; | |
427 | ||
428 | remove_idr: | |
44f6df92 | 429 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd BA |
430 | idr_remove(&glink->lcids, channel->lcid); |
431 | channel->lcid = 0; | |
44f6df92 | 432 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
433 | |
434 | return ret; | |
435 | } | |
436 | ||
437 | static void qcom_glink_send_close_req(struct qcom_glink *glink, | |
438 | struct glink_channel *channel) | |
439 | { | |
440 | struct glink_msg req; | |
441 | ||
442 | req.cmd = cpu_to_le16(RPM_CMD_CLOSE); | |
443 | req.param1 = cpu_to_le16(channel->lcid); | |
444 | req.param2 = 0; | |
445 | ||
446 | qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true); | |
447 | } | |
448 | ||
449 | static void qcom_glink_send_close_ack(struct qcom_glink *glink, | |
450 | unsigned int rcid) | |
451 | { | |
452 | struct glink_msg req; | |
453 | ||
454 | req.cmd = cpu_to_le16(RPM_CMD_CLOSE_ACK); | |
455 | req.param1 = cpu_to_le16(rcid); | |
456 | req.param2 = 0; | |
457 | ||
458 | qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true); | |
459 | } | |
460 | ||
1d2ea36e S |
461 | static void qcom_glink_rx_done_work(struct work_struct *work) |
462 | { | |
463 | struct glink_channel *channel = container_of(work, struct glink_channel, | |
464 | intent_work); | |
465 | struct qcom_glink *glink = channel->glink; | |
466 | struct glink_core_rx_intent *intent, *tmp; | |
467 | struct { | |
468 | u16 id; | |
469 | u16 lcid; | |
470 | u32 liid; | |
471 | } __packed cmd; | |
472 | ||
473 | unsigned int cid = channel->lcid; | |
474 | unsigned int iid; | |
475 | bool reuse; | |
476 | unsigned long flags; | |
477 | ||
478 | spin_lock_irqsave(&channel->intent_lock, flags); | |
479 | list_for_each_entry_safe(intent, tmp, &channel->done_intents, node) { | |
480 | list_del(&intent->node); | |
481 | spin_unlock_irqrestore(&channel->intent_lock, flags); | |
482 | iid = intent->id; | |
483 | reuse = intent->reuse; | |
484 | ||
485 | cmd.id = reuse ? RPM_CMD_RX_DONE_W_REUSE : RPM_CMD_RX_DONE; | |
486 | cmd.lcid = cid; | |
487 | cmd.liid = iid; | |
488 | ||
489 | qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true); | |
490 | if (!reuse) { | |
491 | kfree(intent->data); | |
492 | kfree(intent); | |
493 | } | |
494 | spin_lock_irqsave(&channel->intent_lock, flags); | |
495 | } | |
496 | spin_unlock_irqrestore(&channel->intent_lock, flags); | |
497 | } | |
498 | ||
499 | static void qcom_glink_rx_done(struct qcom_glink *glink, | |
500 | struct glink_channel *channel, | |
501 | struct glink_core_rx_intent *intent) | |
502 | { | |
503 | /* We don't send RX_DONE to intentless systems */ | |
504 | if (glink->intentless) { | |
505 | kfree(intent->data); | |
506 | kfree(intent); | |
507 | return; | |
508 | } | |
509 | ||
510 | /* Take it off the tree of receive intents */ | |
511 | if (!intent->reuse) { | |
512 | spin_lock(&channel->intent_lock); | |
513 | idr_remove(&channel->liids, intent->id); | |
514 | spin_unlock(&channel->intent_lock); | |
515 | } | |
516 | ||
517 | /* Schedule the sending of a rx_done indication */ | |
518 | spin_lock(&channel->intent_lock); | |
519 | list_add_tail(&intent->node, &channel->done_intents); | |
520 | spin_unlock(&channel->intent_lock); | |
521 | ||
522 | schedule_work(&channel->intent_work); | |
523 | } | |
524 | ||
d31ad615 S |
525 | /** |
526 | * qcom_glink_receive_version() - receive version/features from remote system | |
527 | * | |
528 | * @glink: pointer to transport interface | |
6f0b9584 SK |
529 | * @version: remote version |
530 | * @features: remote features | |
d31ad615 S |
531 | * |
532 | * This function is called in response to a remote-initiated version/feature | |
533 | * negotiation sequence. | |
534 | */ | |
535 | static void qcom_glink_receive_version(struct qcom_glink *glink, | |
536 | u32 version, | |
537 | u32 features) | |
538 | { | |
539 | switch (version) { | |
540 | case 0: | |
541 | break; | |
542 | case GLINK_VERSION_1: | |
543 | glink->features &= features; | |
544 | /* FALLTHROUGH */ | |
545 | default: | |
546 | qcom_glink_send_version_ack(glink); | |
547 | break; | |
548 | } | |
549 | } | |
550 | ||
551 | /** | |
552 | * qcom_glink_receive_version_ack() - receive negotiation ack from remote system | |
553 | * | |
554 | * @glink: pointer to transport interface | |
6f0b9584 SK |
555 | * @version: remote version response |
556 | * @features: remote features response | |
d31ad615 S |
557 | * |
558 | * This function is called in response to a local-initiated version/feature | |
559 | * negotiation sequence and is the counter-offer from the remote side based | |
560 | * upon the initial version and feature set requested. | |
561 | */ | |
562 | static void qcom_glink_receive_version_ack(struct qcom_glink *glink, | |
563 | u32 version, | |
564 | u32 features) | |
565 | { | |
566 | switch (version) { | |
567 | case 0: | |
568 | /* Version negotiation failed */ | |
569 | break; | |
570 | case GLINK_VERSION_1: | |
571 | if (features == glink->features) | |
572 | break; | |
573 | ||
574 | glink->features &= features; | |
575 | /* FALLTHROUGH */ | |
576 | default: | |
577 | qcom_glink_send_version(glink); | |
578 | break; | |
579 | } | |
580 | } | |
581 | ||
933b45da S |
582 | /** |
583 | * qcom_glink_send_intent_req_ack() - convert an rx intent request ack cmd to | |
6f0b9584 | 584 | * wire format and transmit |
933b45da S |
585 | * @glink: The transport to transmit on. |
586 | * @channel: The glink channel | |
587 | * @granted: The request response to encode. | |
588 | * | |
589 | * Return: 0 on success or standard Linux error code. | |
590 | */ | |
591 | static int qcom_glink_send_intent_req_ack(struct qcom_glink *glink, | |
592 | struct glink_channel *channel, | |
593 | bool granted) | |
594 | { | |
595 | struct glink_msg msg; | |
596 | ||
597 | msg.cmd = cpu_to_le16(RPM_CMD_RX_INTENT_REQ_ACK); | |
598 | msg.param1 = cpu_to_le16(channel->lcid); | |
599 | msg.param2 = cpu_to_le32(granted); | |
600 | ||
601 | qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); | |
602 | ||
603 | return 0; | |
604 | } | |
605 | ||
606 | /** | |
607 | * qcom_glink_advertise_intent - convert an rx intent cmd to wire format and | |
608 | * transmit | |
609 | * @glink: The transport to transmit on. | |
610 | * @channel: The local channel | |
6f0b9584 | 611 | * @intent: The intent to pass on to remote. |
933b45da S |
612 | * |
613 | * Return: 0 on success or standard Linux error code. | |
614 | */ | |
615 | static int qcom_glink_advertise_intent(struct qcom_glink *glink, | |
616 | struct glink_channel *channel, | |
617 | struct glink_core_rx_intent *intent) | |
618 | { | |
619 | struct command { | |
427613ee SK |
620 | __le16 id; |
621 | __le16 lcid; | |
622 | __le32 count; | |
623 | __le32 size; | |
624 | __le32 liid; | |
933b45da S |
625 | } __packed; |
626 | struct command cmd; | |
627 | ||
628 | cmd.id = cpu_to_le16(RPM_CMD_INTENT); | |
629 | cmd.lcid = cpu_to_le16(channel->lcid); | |
630 | cmd.count = cpu_to_le32(1); | |
631 | cmd.size = cpu_to_le32(intent->size); | |
632 | cmd.liid = cpu_to_le32(intent->id); | |
633 | ||
634 | qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true); | |
635 | ||
636 | return 0; | |
637 | } | |
638 | ||
639 | static struct glink_core_rx_intent * | |
640 | qcom_glink_alloc_intent(struct qcom_glink *glink, | |
641 | struct glink_channel *channel, | |
642 | size_t size, | |
643 | bool reuseable) | |
644 | { | |
645 | struct glink_core_rx_intent *intent; | |
646 | int ret; | |
647 | unsigned long flags; | |
648 | ||
649 | intent = kzalloc(sizeof(*intent), GFP_KERNEL); | |
933b45da S |
650 | if (!intent) |
651 | return NULL; | |
652 | ||
653 | intent->data = kzalloc(size, GFP_KERNEL); | |
654 | if (!intent->data) | |
b775d158 | 655 | goto free_intent; |
933b45da S |
656 | |
657 | spin_lock_irqsave(&channel->intent_lock, flags); | |
658 | ret = idr_alloc_cyclic(&channel->liids, intent, 1, -1, GFP_ATOMIC); | |
659 | if (ret < 0) { | |
660 | spin_unlock_irqrestore(&channel->intent_lock, flags); | |
b775d158 | 661 | goto free_data; |
933b45da S |
662 | } |
663 | spin_unlock_irqrestore(&channel->intent_lock, flags); | |
664 | ||
665 | intent->id = ret; | |
666 | intent->size = size; | |
667 | intent->reuse = reuseable; | |
668 | ||
669 | return intent; | |
b775d158 DC |
670 | |
671 | free_data: | |
672 | kfree(intent->data); | |
673 | free_intent: | |
674 | kfree(intent); | |
675 | return NULL; | |
933b45da S |
676 | } |
677 | ||
88c6060f S |
678 | static void qcom_glink_handle_rx_done(struct qcom_glink *glink, |
679 | u32 cid, uint32_t iid, | |
680 | bool reuse) | |
681 | { | |
682 | struct glink_core_rx_intent *intent; | |
683 | struct glink_channel *channel; | |
684 | unsigned long flags; | |
685 | ||
686 | spin_lock_irqsave(&glink->idr_lock, flags); | |
687 | channel = idr_find(&glink->rcids, cid); | |
688 | spin_unlock_irqrestore(&glink->idr_lock, flags); | |
689 | if (!channel) { | |
690 | dev_err(glink->dev, "invalid channel id received\n"); | |
691 | return; | |
692 | } | |
693 | ||
694 | spin_lock_irqsave(&channel->intent_lock, flags); | |
695 | intent = idr_find(&channel->riids, iid); | |
696 | ||
697 | if (!intent) { | |
698 | spin_unlock_irqrestore(&channel->intent_lock, flags); | |
699 | dev_err(glink->dev, "invalid intent id received\n"); | |
700 | return; | |
701 | } | |
702 | ||
703 | intent->in_use = false; | |
704 | ||
705 | if (!reuse) { | |
706 | idr_remove(&channel->riids, intent->id); | |
707 | kfree(intent); | |
708 | } | |
709 | spin_unlock_irqrestore(&channel->intent_lock, flags); | |
710 | } | |
711 | ||
933b45da S |
712 | /** |
713 | * qcom_glink_handle_intent_req() - Receive a request for rx_intent | |
714 | * from remote side | |
6f0b9584 SK |
715 | * @glink: Pointer to the transport interface |
716 | * @cid: Remote channel ID | |
717 | * @size: size of the intent | |
933b45da S |
718 | * |
719 | * The function searches for the local channel to which the request for | |
720 | * rx_intent has arrived and allocates and notifies the remote back | |
721 | */ | |
722 | static void qcom_glink_handle_intent_req(struct qcom_glink *glink, | |
723 | u32 cid, size_t size) | |
724 | { | |
725 | struct glink_core_rx_intent *intent; | |
726 | struct glink_channel *channel; | |
727 | unsigned long flags; | |
728 | ||
729 | spin_lock_irqsave(&glink->idr_lock, flags); | |
730 | channel = idr_find(&glink->rcids, cid); | |
731 | spin_unlock_irqrestore(&glink->idr_lock, flags); | |
732 | ||
733 | if (!channel) { | |
734 | pr_err("%s channel not found for cid %d\n", __func__, cid); | |
735 | return; | |
736 | } | |
737 | ||
738 | intent = qcom_glink_alloc_intent(glink, channel, size, false); | |
739 | if (intent) | |
740 | qcom_glink_advertise_intent(glink, channel, intent); | |
741 | ||
742 | qcom_glink_send_intent_req_ack(glink, channel, !!intent); | |
743 | } | |
744 | ||
835764dd BA |
745 | static int qcom_glink_rx_defer(struct qcom_glink *glink, size_t extra) |
746 | { | |
747 | struct glink_defer_cmd *dcmd; | |
748 | ||
749 | extra = ALIGN(extra, 8); | |
750 | ||
751 | if (qcom_glink_rx_avail(glink) < sizeof(struct glink_msg) + extra) { | |
752 | dev_dbg(glink->dev, "Insufficient data in rx fifo"); | |
753 | return -ENXIO; | |
754 | } | |
755 | ||
756 | dcmd = kzalloc(sizeof(*dcmd) + extra, GFP_ATOMIC); | |
757 | if (!dcmd) | |
758 | return -ENOMEM; | |
759 | ||
760 | INIT_LIST_HEAD(&dcmd->node); | |
761 | ||
b88eee97 | 762 | qcom_glink_rx_peak(glink, &dcmd->msg, 0, sizeof(dcmd->msg) + extra); |
835764dd BA |
763 | |
764 | spin_lock(&glink->rx_lock); | |
765 | list_add_tail(&dcmd->node, &glink->rx_queue); | |
766 | spin_unlock(&glink->rx_lock); | |
767 | ||
768 | schedule_work(&glink->rx_work); | |
769 | qcom_glink_rx_advance(glink, sizeof(dcmd->msg) + extra); | |
770 | ||
771 | return 0; | |
772 | } | |
773 | ||
774 | static int qcom_glink_rx_data(struct qcom_glink *glink, size_t avail) | |
775 | { | |
64f95f87 | 776 | struct glink_core_rx_intent *intent; |
835764dd BA |
777 | struct glink_channel *channel; |
778 | struct { | |
779 | struct glink_msg msg; | |
780 | __le32 chunk_size; | |
781 | __le32 left_size; | |
782 | } __packed hdr; | |
783 | unsigned int chunk_size; | |
784 | unsigned int left_size; | |
785 | unsigned int rcid; | |
64f95f87 S |
786 | unsigned int liid; |
787 | int ret = 0; | |
44f6df92 | 788 | unsigned long flags; |
835764dd BA |
789 | |
790 | if (avail < sizeof(hdr)) { | |
791 | dev_dbg(glink->dev, "Not enough data in fifo\n"); | |
792 | return -EAGAIN; | |
793 | } | |
794 | ||
b88eee97 | 795 | qcom_glink_rx_peak(glink, &hdr, 0, sizeof(hdr)); |
835764dd BA |
796 | chunk_size = le32_to_cpu(hdr.chunk_size); |
797 | left_size = le32_to_cpu(hdr.left_size); | |
798 | ||
799 | if (avail < sizeof(hdr) + chunk_size) { | |
800 | dev_dbg(glink->dev, "Payload not yet in fifo\n"); | |
801 | return -EAGAIN; | |
802 | } | |
803 | ||
835764dd | 804 | rcid = le16_to_cpu(hdr.msg.param1); |
44f6df92 | 805 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd | 806 | channel = idr_find(&glink->rcids, rcid); |
44f6df92 | 807 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
808 | if (!channel) { |
809 | dev_dbg(glink->dev, "Data on non-existing channel\n"); | |
810 | ||
811 | /* Drop the message */ | |
64f95f87 | 812 | goto advance_rx; |
835764dd BA |
813 | } |
814 | ||
64f95f87 S |
815 | if (glink->intentless) { |
816 | /* Might have an ongoing, fragmented, message to append */ | |
817 | if (!channel->buf) { | |
818 | intent = kzalloc(sizeof(*intent), GFP_ATOMIC); | |
819 | if (!intent) | |
820 | return -ENOMEM; | |
821 | ||
822 | intent->data = kmalloc(chunk_size + left_size, | |
823 | GFP_ATOMIC); | |
824 | if (!intent->data) { | |
825 | kfree(intent); | |
826 | return -ENOMEM; | |
827 | } | |
828 | ||
829 | intent->id = 0xbabababa; | |
830 | intent->size = chunk_size + left_size; | |
831 | intent->offset = 0; | |
832 | ||
833 | channel->buf = intent; | |
834 | } else { | |
835 | intent = channel->buf; | |
836 | } | |
837 | } else { | |
838 | liid = le32_to_cpu(hdr.msg.param2); | |
835764dd | 839 | |
64f95f87 S |
840 | spin_lock_irqsave(&channel->intent_lock, flags); |
841 | intent = idr_find(&channel->liids, liid); | |
842 | spin_unlock_irqrestore(&channel->intent_lock, flags); | |
835764dd | 843 | |
64f95f87 S |
844 | if (!intent) { |
845 | dev_err(glink->dev, | |
846 | "no intent found for channel %s intent %d", | |
847 | channel->name, liid); | |
848 | goto advance_rx; | |
849 | } | |
850 | } | |
835764dd | 851 | |
64f95f87 S |
852 | if (intent->size - intent->offset < chunk_size) { |
853 | dev_err(glink->dev, "Insufficient space in intent\n"); | |
835764dd BA |
854 | |
855 | /* The packet header lied, drop payload */ | |
64f95f87 | 856 | goto advance_rx; |
835764dd BA |
857 | } |
858 | ||
64f95f87 | 859 | qcom_glink_rx_peak(glink, intent->data + intent->offset, |
b88eee97 | 860 | sizeof(hdr), chunk_size); |
64f95f87 | 861 | intent->offset += chunk_size; |
835764dd BA |
862 | |
863 | /* Handle message when no fragments remain to be received */ | |
864 | if (!left_size) { | |
865 | spin_lock(&channel->recv_lock); | |
866 | if (channel->ept.cb) { | |
867 | channel->ept.cb(channel->ept.rpdev, | |
64f95f87 S |
868 | intent->data, |
869 | intent->offset, | |
835764dd BA |
870 | channel->ept.priv, |
871 | RPMSG_ADDR_ANY); | |
872 | } | |
873 | spin_unlock(&channel->recv_lock); | |
874 | ||
64f95f87 | 875 | intent->offset = 0; |
835764dd | 876 | channel->buf = NULL; |
1d2ea36e S |
877 | |
878 | qcom_glink_rx_done(glink, channel, intent); | |
835764dd BA |
879 | } |
880 | ||
64f95f87 | 881 | advance_rx: |
b88eee97 | 882 | qcom_glink_rx_advance(glink, ALIGN(sizeof(hdr) + chunk_size, 8)); |
835764dd | 883 | |
64f95f87 | 884 | return ret; |
835764dd BA |
885 | } |
886 | ||
dacbb35e S |
887 | static void qcom_glink_handle_intent(struct qcom_glink *glink, |
888 | unsigned int cid, | |
889 | unsigned int count, | |
890 | size_t avail) | |
891 | { | |
892 | struct glink_core_rx_intent *intent; | |
893 | struct glink_channel *channel; | |
894 | struct intent_pair { | |
895 | __le32 size; | |
896 | __le32 iid; | |
897 | }; | |
898 | ||
899 | struct { | |
900 | struct glink_msg msg; | |
901 | struct intent_pair intents[]; | |
902 | } __packed * msg; | |
903 | ||
61c65f47 | 904 | const size_t msglen = struct_size(msg, intents, count); |
dacbb35e S |
905 | int ret; |
906 | int i; | |
907 | unsigned long flags; | |
908 | ||
909 | if (avail < msglen) { | |
910 | dev_dbg(glink->dev, "Not enough data in fifo\n"); | |
911 | return; | |
912 | } | |
913 | ||
914 | spin_lock_irqsave(&glink->idr_lock, flags); | |
915 | channel = idr_find(&glink->rcids, cid); | |
916 | spin_unlock_irqrestore(&glink->idr_lock, flags); | |
917 | if (!channel) { | |
918 | dev_err(glink->dev, "intents for non-existing channel\n"); | |
919 | return; | |
920 | } | |
921 | ||
922 | msg = kmalloc(msglen, GFP_ATOMIC); | |
923 | if (!msg) | |
924 | return; | |
925 | ||
926 | qcom_glink_rx_peak(glink, msg, 0, msglen); | |
927 | ||
928 | for (i = 0; i < count; ++i) { | |
929 | intent = kzalloc(sizeof(*intent), GFP_ATOMIC); | |
930 | if (!intent) | |
931 | break; | |
932 | ||
933 | intent->id = le32_to_cpu(msg->intents[i].iid); | |
934 | intent->size = le32_to_cpu(msg->intents[i].size); | |
935 | ||
936 | spin_lock_irqsave(&channel->intent_lock, flags); | |
937 | ret = idr_alloc(&channel->riids, intent, | |
938 | intent->id, intent->id + 1, GFP_ATOMIC); | |
939 | spin_unlock_irqrestore(&channel->intent_lock, flags); | |
940 | ||
941 | if (ret < 0) | |
942 | dev_err(glink->dev, "failed to store remote intent\n"); | |
943 | } | |
944 | ||
945 | kfree(msg); | |
946 | qcom_glink_rx_advance(glink, ALIGN(msglen, 8)); | |
947 | } | |
948 | ||
835764dd BA |
949 | static int qcom_glink_rx_open_ack(struct qcom_glink *glink, unsigned int lcid) |
950 | { | |
951 | struct glink_channel *channel; | |
952 | ||
44f6df92 | 953 | spin_lock(&glink->idr_lock); |
835764dd | 954 | channel = idr_find(&glink->lcids, lcid); |
5f5423ff | 955 | spin_unlock(&glink->idr_lock); |
835764dd BA |
956 | if (!channel) { |
957 | dev_err(glink->dev, "Invalid open ack packet\n"); | |
958 | return -EINVAL; | |
959 | } | |
960 | ||
961 | complete(&channel->open_ack); | |
962 | ||
963 | return 0; | |
964 | } | |
965 | ||
966 | static irqreturn_t qcom_glink_native_intr(int irq, void *data) | |
967 | { | |
968 | struct qcom_glink *glink = data; | |
969 | struct glink_msg msg; | |
970 | unsigned int param1; | |
971 | unsigned int param2; | |
972 | unsigned int avail; | |
973 | unsigned int cmd; | |
ed43d098 | 974 | int ret = 0; |
835764dd BA |
975 | |
976 | for (;;) { | |
977 | avail = qcom_glink_rx_avail(glink); | |
978 | if (avail < sizeof(msg)) | |
979 | break; | |
980 | ||
b88eee97 | 981 | qcom_glink_rx_peak(glink, &msg, 0, sizeof(msg)); |
835764dd BA |
982 | |
983 | cmd = le16_to_cpu(msg.cmd); | |
984 | param1 = le16_to_cpu(msg.param1); | |
985 | param2 = le32_to_cpu(msg.param2); | |
986 | ||
987 | switch (cmd) { | |
988 | case RPM_CMD_VERSION: | |
989 | case RPM_CMD_VERSION_ACK: | |
990 | case RPM_CMD_CLOSE: | |
991 | case RPM_CMD_CLOSE_ACK: | |
933b45da | 992 | case RPM_CMD_RX_INTENT_REQ: |
835764dd BA |
993 | ret = qcom_glink_rx_defer(glink, 0); |
994 | break; | |
995 | case RPM_CMD_OPEN_ACK: | |
996 | ret = qcom_glink_rx_open_ack(glink, param1); | |
997 | qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); | |
998 | break; | |
999 | case RPM_CMD_OPEN: | |
1000 | ret = qcom_glink_rx_defer(glink, param2); | |
1001 | break; | |
1002 | case RPM_CMD_TX_DATA: | |
1003 | case RPM_CMD_TX_DATA_CONT: | |
1004 | ret = qcom_glink_rx_data(glink, avail); | |
1005 | break; | |
1006 | case RPM_CMD_READ_NOTIF: | |
1007 | qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); | |
1008 | ||
1009 | mbox_send_message(glink->mbox_chan, NULL); | |
1010 | mbox_client_txdone(glink->mbox_chan, 0); | |
835764dd | 1011 | break; |
dacbb35e S |
1012 | case RPM_CMD_INTENT: |
1013 | qcom_glink_handle_intent(glink, param1, param2, avail); | |
1014 | break; | |
88c6060f S |
1015 | case RPM_CMD_RX_DONE: |
1016 | qcom_glink_handle_rx_done(glink, param1, param2, false); | |
1017 | qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); | |
1018 | break; | |
1019 | case RPM_CMD_RX_DONE_W_REUSE: | |
1020 | qcom_glink_handle_rx_done(glink, param1, param2, true); | |
1021 | qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); | |
1022 | break; | |
27b9c5b6 S |
1023 | case RPM_CMD_RX_INTENT_REQ_ACK: |
1024 | qcom_glink_handle_intent_req_ack(glink, param1, param2); | |
1025 | qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); | |
1026 | break; | |
835764dd BA |
1027 | default: |
1028 | dev_err(glink->dev, "unhandled rx cmd: %d\n", cmd); | |
1029 | ret = -EINVAL; | |
1030 | break; | |
1031 | } | |
1032 | ||
1033 | if (ret) | |
1034 | break; | |
1035 | } | |
1036 | ||
1037 | return IRQ_HANDLED; | |
1038 | } | |
1039 | ||
1040 | /* Locally initiated rpmsg_create_ept */ | |
1041 | static struct glink_channel *qcom_glink_create_local(struct qcom_glink *glink, | |
1042 | const char *name) | |
1043 | { | |
1044 | struct glink_channel *channel; | |
1045 | int ret; | |
44f6df92 | 1046 | unsigned long flags; |
835764dd BA |
1047 | |
1048 | channel = qcom_glink_alloc_channel(glink, name); | |
1049 | if (IS_ERR(channel)) | |
1050 | return ERR_CAST(channel); | |
1051 | ||
1052 | ret = qcom_glink_send_open_req(glink, channel); | |
1053 | if (ret) | |
1054 | goto release_channel; | |
1055 | ||
1056 | ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ); | |
1057 | if (!ret) | |
1058 | goto err_timeout; | |
1059 | ||
1060 | ret = wait_for_completion_timeout(&channel->open_req, 5 * HZ); | |
1061 | if (!ret) | |
1062 | goto err_timeout; | |
1063 | ||
1064 | qcom_glink_send_open_ack(glink, channel); | |
1065 | ||
1066 | return channel; | |
1067 | ||
1068 | err_timeout: | |
1069 | /* qcom_glink_send_open_req() did register the channel in lcids*/ | |
44f6df92 | 1070 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd | 1071 | idr_remove(&glink->lcids, channel->lcid); |
44f6df92 | 1072 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1073 | |
1074 | release_channel: | |
1075 | /* Release qcom_glink_send_open_req() reference */ | |
1076 | kref_put(&channel->refcount, qcom_glink_channel_release); | |
1077 | /* Release qcom_glink_alloc_channel() reference */ | |
1078 | kref_put(&channel->refcount, qcom_glink_channel_release); | |
1079 | ||
1080 | return ERR_PTR(-ETIMEDOUT); | |
1081 | } | |
1082 | ||
1083 | /* Remote initiated rpmsg_create_ept */ | |
1084 | static int qcom_glink_create_remote(struct qcom_glink *glink, | |
1085 | struct glink_channel *channel) | |
1086 | { | |
1087 | int ret; | |
1088 | ||
1089 | qcom_glink_send_open_ack(glink, channel); | |
1090 | ||
1091 | ret = qcom_glink_send_open_req(glink, channel); | |
1092 | if (ret) | |
1093 | goto close_link; | |
1094 | ||
1095 | ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ); | |
1096 | if (!ret) { | |
1097 | ret = -ETIMEDOUT; | |
1098 | goto close_link; | |
1099 | } | |
1100 | ||
1101 | return 0; | |
1102 | ||
1103 | close_link: | |
1104 | /* | |
1105 | * Send a close request to "undo" our open-ack. The close-ack will | |
ac74ea01 AKN |
1106 | * release qcom_glink_send_open_req() reference and the last reference |
1107 | * will be relesed after receiving remote_close or transport unregister | |
1108 | * by calling qcom_glink_native_remove(). | |
835764dd BA |
1109 | */ |
1110 | qcom_glink_send_close_req(glink, channel); | |
1111 | ||
835764dd BA |
1112 | return ret; |
1113 | } | |
1114 | ||
1115 | static struct rpmsg_endpoint *qcom_glink_create_ept(struct rpmsg_device *rpdev, | |
1116 | rpmsg_rx_cb_t cb, | |
1117 | void *priv, | |
1118 | struct rpmsg_channel_info | |
1119 | chinfo) | |
1120 | { | |
1121 | struct glink_channel *parent = to_glink_channel(rpdev->ept); | |
1122 | struct glink_channel *channel; | |
1123 | struct qcom_glink *glink = parent->glink; | |
1124 | struct rpmsg_endpoint *ept; | |
1125 | const char *name = chinfo.name; | |
1126 | int cid; | |
1127 | int ret; | |
44f6df92 | 1128 | unsigned long flags; |
835764dd | 1129 | |
44f6df92 | 1130 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd BA |
1131 | idr_for_each_entry(&glink->rcids, channel, cid) { |
1132 | if (!strcmp(channel->name, name)) | |
1133 | break; | |
1134 | } | |
44f6df92 | 1135 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1136 | |
1137 | if (!channel) { | |
1138 | channel = qcom_glink_create_local(glink, name); | |
1139 | if (IS_ERR(channel)) | |
1140 | return NULL; | |
1141 | } else { | |
1142 | ret = qcom_glink_create_remote(glink, channel); | |
1143 | if (ret) | |
1144 | return NULL; | |
1145 | } | |
1146 | ||
1147 | ept = &channel->ept; | |
1148 | ept->rpdev = rpdev; | |
1149 | ept->cb = cb; | |
1150 | ept->priv = priv; | |
1151 | ept->ops = &glink_endpoint_ops; | |
1152 | ||
1153 | return ept; | |
1154 | } | |
1155 | ||
6bf68cbd S |
1156 | static int qcom_glink_announce_create(struct rpmsg_device *rpdev) |
1157 | { | |
1158 | struct glink_channel *channel = to_glink_channel(rpdev->ept); | |
07389377 | 1159 | struct device_node *np = rpdev->dev.of_node; |
6bf68cbd | 1160 | struct qcom_glink *glink = channel->glink; |
07389377 CL |
1161 | struct glink_core_rx_intent *intent; |
1162 | const struct property *prop = NULL; | |
1163 | __be32 defaults[] = { cpu_to_be32(SZ_1K), cpu_to_be32(5) }; | |
1164 | int num_intents; | |
1165 | int num_groups = 1; | |
1166 | __be32 *val = defaults; | |
1167 | int size; | |
1168 | ||
1169 | if (glink->intentless) | |
1170 | return 0; | |
1171 | ||
1172 | prop = of_find_property(np, "qcom,intents", NULL); | |
1173 | if (prop) { | |
1174 | val = prop->value; | |
1175 | num_groups = prop->length / sizeof(u32) / 2; | |
1176 | } | |
6bf68cbd S |
1177 | |
1178 | /* Channel is now open, advertise base set of intents */ | |
07389377 CL |
1179 | while (num_groups--) { |
1180 | size = be32_to_cpup(val++); | |
1181 | num_intents = be32_to_cpup(val++); | |
1182 | while (num_intents--) { | |
1183 | intent = qcom_glink_alloc_intent(glink, channel, size, | |
1184 | true); | |
1185 | if (!intent) | |
1186 | break; | |
6bf68cbd | 1187 | |
07389377 CL |
1188 | qcom_glink_advertise_intent(glink, channel, intent); |
1189 | } | |
6bf68cbd | 1190 | } |
6bf68cbd S |
1191 | return 0; |
1192 | } | |
1193 | ||
835764dd BA |
1194 | static void qcom_glink_destroy_ept(struct rpmsg_endpoint *ept) |
1195 | { | |
1196 | struct glink_channel *channel = to_glink_channel(ept); | |
1197 | struct qcom_glink *glink = channel->glink; | |
1198 | unsigned long flags; | |
1199 | ||
1200 | spin_lock_irqsave(&channel->recv_lock, flags); | |
1201 | channel->ept.cb = NULL; | |
1202 | spin_unlock_irqrestore(&channel->recv_lock, flags); | |
1203 | ||
1204 | /* Decouple the potential rpdev from the channel */ | |
1205 | channel->rpdev = NULL; | |
1206 | ||
1207 | qcom_glink_send_close_req(glink, channel); | |
1208 | } | |
1209 | ||
27b9c5b6 S |
1210 | static int qcom_glink_request_intent(struct qcom_glink *glink, |
1211 | struct glink_channel *channel, | |
1212 | size_t size) | |
1213 | { | |
1214 | struct { | |
1215 | u16 id; | |
1216 | u16 cid; | |
1217 | u32 size; | |
1218 | } __packed cmd; | |
1219 | ||
1220 | int ret; | |
1221 | ||
1222 | mutex_lock(&channel->intent_req_lock); | |
1223 | ||
1224 | reinit_completion(&channel->intent_req_comp); | |
1225 | ||
1226 | cmd.id = RPM_CMD_RX_INTENT_REQ; | |
1227 | cmd.cid = channel->lcid; | |
1228 | cmd.size = size; | |
1229 | ||
1230 | ret = qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true); | |
1231 | if (ret) | |
0a7480bd | 1232 | goto unlock; |
27b9c5b6 S |
1233 | |
1234 | ret = wait_for_completion_timeout(&channel->intent_req_comp, 10 * HZ); | |
1235 | if (!ret) { | |
1236 | dev_err(glink->dev, "intent request timed out\n"); | |
1237 | ret = -ETIMEDOUT; | |
1238 | } else { | |
1239 | ret = channel->intent_req_result ? 0 : -ECANCELED; | |
1240 | } | |
1241 | ||
0a7480bd | 1242 | unlock: |
27b9c5b6 S |
1243 | mutex_unlock(&channel->intent_req_lock); |
1244 | return ret; | |
1245 | } | |
1246 | ||
835764dd BA |
1247 | static int __qcom_glink_send(struct glink_channel *channel, |
1248 | void *data, int len, bool wait) | |
1249 | { | |
1250 | struct qcom_glink *glink = channel->glink; | |
11cb45a7 S |
1251 | struct glink_core_rx_intent *intent = NULL; |
1252 | struct glink_core_rx_intent *tmp; | |
1253 | int iid = 0; | |
835764dd BA |
1254 | struct { |
1255 | struct glink_msg msg; | |
1256 | __le32 chunk_size; | |
1257 | __le32 left_size; | |
1258 | } __packed req; | |
11cb45a7 S |
1259 | int ret; |
1260 | unsigned long flags; | |
1261 | ||
1262 | if (!glink->intentless) { | |
27b9c5b6 | 1263 | while (!intent) { |
11cb45a7 S |
1264 | spin_lock_irqsave(&channel->intent_lock, flags); |
1265 | idr_for_each_entry(&channel->riids, tmp, iid) { | |
1266 | if (tmp->size >= len && !tmp->in_use) { | |
29031870 CL |
1267 | if (!intent) |
1268 | intent = tmp; | |
1269 | else if (intent->size > tmp->size) | |
1270 | intent = tmp; | |
1271 | if (intent->size == len) | |
1272 | break; | |
11cb45a7 S |
1273 | } |
1274 | } | |
29031870 CL |
1275 | if (intent) |
1276 | intent->in_use = true; | |
11cb45a7 S |
1277 | spin_unlock_irqrestore(&channel->intent_lock, flags); |
1278 | ||
1279 | /* We found an available intent */ | |
27b9c5b6 S |
1280 | if (intent) |
1281 | break; | |
1282 | ||
1283 | if (!wait) | |
11cb45a7 | 1284 | return -EBUSY; |
27b9c5b6 S |
1285 | |
1286 | ret = qcom_glink_request_intent(glink, channel, len); | |
1287 | if (ret < 0) | |
1288 | return ret; | |
11cb45a7 S |
1289 | } |
1290 | ||
1291 | iid = intent->id; | |
1292 | } | |
835764dd | 1293 | |
835764dd BA |
1294 | req.msg.cmd = cpu_to_le16(RPM_CMD_TX_DATA); |
1295 | req.msg.param1 = cpu_to_le16(channel->lcid); | |
11cb45a7 | 1296 | req.msg.param2 = cpu_to_le32(iid); |
835764dd BA |
1297 | req.chunk_size = cpu_to_le32(len); |
1298 | req.left_size = cpu_to_le32(0); | |
1299 | ||
11cb45a7 S |
1300 | ret = qcom_glink_tx(glink, &req, sizeof(req), data, len, wait); |
1301 | ||
1302 | /* Mark intent available if we failed */ | |
906cf29c | 1303 | if (ret && intent) |
11cb45a7 S |
1304 | intent->in_use = false; |
1305 | ||
1306 | return ret; | |
835764dd BA |
1307 | } |
1308 | ||
1309 | static int qcom_glink_send(struct rpmsg_endpoint *ept, void *data, int len) | |
1310 | { | |
1311 | struct glink_channel *channel = to_glink_channel(ept); | |
1312 | ||
1313 | return __qcom_glink_send(channel, data, len, true); | |
1314 | } | |
1315 | ||
1316 | static int qcom_glink_trysend(struct rpmsg_endpoint *ept, void *data, int len) | |
1317 | { | |
1318 | struct glink_channel *channel = to_glink_channel(ept); | |
1319 | ||
1320 | return __qcom_glink_send(channel, data, len, false); | |
1321 | } | |
1322 | ||
1323 | /* | |
1324 | * Finds the device_node for the glink child interested in this channel. | |
1325 | */ | |
1326 | static struct device_node *qcom_glink_match_channel(struct device_node *node, | |
1327 | const char *channel) | |
1328 | { | |
1329 | struct device_node *child; | |
1330 | const char *name; | |
1331 | const char *key; | |
1332 | int ret; | |
1333 | ||
1334 | for_each_available_child_of_node(node, child) { | |
1335 | key = "qcom,glink-channels"; | |
1336 | ret = of_property_read_string(child, key, &name); | |
1337 | if (ret) | |
1338 | continue; | |
1339 | ||
1340 | if (strcmp(name, channel) == 0) | |
1341 | return child; | |
1342 | } | |
1343 | ||
1344 | return NULL; | |
1345 | } | |
1346 | ||
1347 | static const struct rpmsg_device_ops glink_device_ops = { | |
1348 | .create_ept = qcom_glink_create_ept, | |
6bf68cbd | 1349 | .announce_create = qcom_glink_announce_create, |
835764dd BA |
1350 | }; |
1351 | ||
1352 | static const struct rpmsg_endpoint_ops glink_endpoint_ops = { | |
1353 | .destroy_ept = qcom_glink_destroy_ept, | |
1354 | .send = qcom_glink_send, | |
1355 | .trysend = qcom_glink_trysend, | |
1356 | }; | |
1357 | ||
1358 | static void qcom_glink_rpdev_release(struct device *dev) | |
1359 | { | |
1360 | struct rpmsg_device *rpdev = to_rpmsg_device(dev); | |
1361 | struct glink_channel *channel = to_glink_channel(rpdev->ept); | |
1362 | ||
1363 | channel->rpdev = NULL; | |
1364 | kfree(rpdev); | |
1365 | } | |
1366 | ||
1367 | static int qcom_glink_rx_open(struct qcom_glink *glink, unsigned int rcid, | |
1368 | char *name) | |
1369 | { | |
1370 | struct glink_channel *channel; | |
1371 | struct rpmsg_device *rpdev; | |
1372 | bool create_device = false; | |
1373 | struct device_node *node; | |
1374 | int lcid; | |
1375 | int ret; | |
44f6df92 | 1376 | unsigned long flags; |
835764dd | 1377 | |
44f6df92 | 1378 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd BA |
1379 | idr_for_each_entry(&glink->lcids, channel, lcid) { |
1380 | if (!strcmp(channel->name, name)) | |
1381 | break; | |
1382 | } | |
44f6df92 | 1383 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1384 | |
1385 | if (!channel) { | |
1386 | channel = qcom_glink_alloc_channel(glink, name); | |
1387 | if (IS_ERR(channel)) | |
1388 | return PTR_ERR(channel); | |
1389 | ||
1390 | /* The opening dance was initiated by the remote */ | |
1391 | create_device = true; | |
1392 | } | |
1393 | ||
44f6df92 S |
1394 | spin_lock_irqsave(&glink->idr_lock, flags); |
1395 | ret = idr_alloc(&glink->rcids, channel, rcid, rcid + 1, GFP_ATOMIC); | |
835764dd BA |
1396 | if (ret < 0) { |
1397 | dev_err(glink->dev, "Unable to insert channel into rcid list\n"); | |
44f6df92 | 1398 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1399 | goto free_channel; |
1400 | } | |
1401 | channel->rcid = ret; | |
44f6df92 | 1402 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1403 | |
1404 | complete(&channel->open_req); | |
1405 | ||
1406 | if (create_device) { | |
1407 | rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL); | |
1408 | if (!rpdev) { | |
1409 | ret = -ENOMEM; | |
1410 | goto rcid_remove; | |
1411 | } | |
1412 | ||
1413 | rpdev->ept = &channel->ept; | |
1414 | strncpy(rpdev->id.name, name, RPMSG_NAME_SIZE); | |
1415 | rpdev->src = RPMSG_ADDR_ANY; | |
1416 | rpdev->dst = RPMSG_ADDR_ANY; | |
1417 | rpdev->ops = &glink_device_ops; | |
1418 | ||
1419 | node = qcom_glink_match_channel(glink->dev->of_node, name); | |
1420 | rpdev->dev.of_node = node; | |
1421 | rpdev->dev.parent = glink->dev; | |
1422 | rpdev->dev.release = qcom_glink_rpdev_release; | |
1423 | ||
1424 | ret = rpmsg_register_device(rpdev); | |
1425 | if (ret) | |
1426 | goto free_rpdev; | |
1427 | ||
1428 | channel->rpdev = rpdev; | |
1429 | } | |
1430 | ||
1431 | return 0; | |
1432 | ||
1433 | free_rpdev: | |
1434 | kfree(rpdev); | |
1435 | rcid_remove: | |
44f6df92 | 1436 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd BA |
1437 | idr_remove(&glink->rcids, channel->rcid); |
1438 | channel->rcid = 0; | |
44f6df92 | 1439 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1440 | free_channel: |
1441 | /* Release the reference, iff we took it */ | |
1442 | if (create_device) | |
1443 | kref_put(&channel->refcount, qcom_glink_channel_release); | |
1444 | ||
1445 | return ret; | |
1446 | } | |
1447 | ||
1448 | static void qcom_glink_rx_close(struct qcom_glink *glink, unsigned int rcid) | |
1449 | { | |
1450 | struct rpmsg_channel_info chinfo; | |
1451 | struct glink_channel *channel; | |
44f6df92 | 1452 | unsigned long flags; |
835764dd | 1453 | |
44f6df92 | 1454 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd | 1455 | channel = idr_find(&glink->rcids, rcid); |
44f6df92 | 1456 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1457 | if (WARN(!channel, "close request on unknown channel\n")) |
1458 | return; | |
1459 | ||
1d2ea36e S |
1460 | /* cancel pending rx_done work */ |
1461 | cancel_work_sync(&channel->intent_work); | |
1462 | ||
835764dd BA |
1463 | if (channel->rpdev) { |
1464 | strncpy(chinfo.name, channel->name, sizeof(chinfo.name)); | |
1465 | chinfo.src = RPMSG_ADDR_ANY; | |
1466 | chinfo.dst = RPMSG_ADDR_ANY; | |
1467 | ||
1468 | rpmsg_unregister_device(glink->dev, &chinfo); | |
1469 | } | |
1470 | ||
1471 | qcom_glink_send_close_ack(glink, channel->rcid); | |
1472 | ||
44f6df92 | 1473 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd BA |
1474 | idr_remove(&glink->rcids, channel->rcid); |
1475 | channel->rcid = 0; | |
44f6df92 | 1476 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1477 | |
1478 | kref_put(&channel->refcount, qcom_glink_channel_release); | |
1479 | } | |
1480 | ||
1481 | static void qcom_glink_rx_close_ack(struct qcom_glink *glink, unsigned int lcid) | |
1482 | { | |
1483 | struct glink_channel *channel; | |
44f6df92 | 1484 | unsigned long flags; |
835764dd | 1485 | |
44f6df92 | 1486 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd | 1487 | channel = idr_find(&glink->lcids, lcid); |
44f6df92 S |
1488 | if (WARN(!channel, "close ack on unknown channel\n")) { |
1489 | spin_unlock_irqrestore(&glink->idr_lock, flags); | |
835764dd | 1490 | return; |
44f6df92 | 1491 | } |
835764dd | 1492 | |
835764dd BA |
1493 | idr_remove(&glink->lcids, channel->lcid); |
1494 | channel->lcid = 0; | |
44f6df92 | 1495 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1496 | |
1497 | kref_put(&channel->refcount, qcom_glink_channel_release); | |
1498 | } | |
1499 | ||
1500 | static void qcom_glink_work(struct work_struct *work) | |
1501 | { | |
1502 | struct qcom_glink *glink = container_of(work, struct qcom_glink, | |
1503 | rx_work); | |
1504 | struct glink_defer_cmd *dcmd; | |
1505 | struct glink_msg *msg; | |
1506 | unsigned long flags; | |
1507 | unsigned int param1; | |
1508 | unsigned int param2; | |
1509 | unsigned int cmd; | |
1510 | ||
1511 | for (;;) { | |
1512 | spin_lock_irqsave(&glink->rx_lock, flags); | |
1513 | if (list_empty(&glink->rx_queue)) { | |
1514 | spin_unlock_irqrestore(&glink->rx_lock, flags); | |
1515 | break; | |
1516 | } | |
1517 | dcmd = list_first_entry(&glink->rx_queue, | |
1518 | struct glink_defer_cmd, node); | |
1519 | list_del(&dcmd->node); | |
1520 | spin_unlock_irqrestore(&glink->rx_lock, flags); | |
1521 | ||
1522 | msg = &dcmd->msg; | |
1523 | cmd = le16_to_cpu(msg->cmd); | |
1524 | param1 = le16_to_cpu(msg->param1); | |
1525 | param2 = le32_to_cpu(msg->param2); | |
1526 | ||
1527 | switch (cmd) { | |
1528 | case RPM_CMD_VERSION: | |
d31ad615 | 1529 | qcom_glink_receive_version(glink, param1, param2); |
835764dd BA |
1530 | break; |
1531 | case RPM_CMD_VERSION_ACK: | |
d31ad615 | 1532 | qcom_glink_receive_version_ack(glink, param1, param2); |
835764dd BA |
1533 | break; |
1534 | case RPM_CMD_OPEN: | |
1535 | qcom_glink_rx_open(glink, param1, msg->data); | |
1536 | break; | |
1537 | case RPM_CMD_CLOSE: | |
1538 | qcom_glink_rx_close(glink, param1); | |
1539 | break; | |
1540 | case RPM_CMD_CLOSE_ACK: | |
1541 | qcom_glink_rx_close_ack(glink, param1); | |
1542 | break; | |
933b45da S |
1543 | case RPM_CMD_RX_INTENT_REQ: |
1544 | qcom_glink_handle_intent_req(glink, param1, param2); | |
1545 | break; | |
835764dd BA |
1546 | default: |
1547 | WARN(1, "Unknown defer object %d\n", cmd); | |
1548 | break; | |
1549 | } | |
1550 | ||
1551 | kfree(dcmd); | |
1552 | } | |
1553 | } | |
1554 | ||
1555 | struct qcom_glink *qcom_glink_native_probe(struct device *dev, | |
d31ad615 | 1556 | unsigned long features, |
835764dd | 1557 | struct qcom_glink_pipe *rx, |
933b45da S |
1558 | struct qcom_glink_pipe *tx, |
1559 | bool intentless) | |
835764dd BA |
1560 | { |
1561 | int irq; | |
1562 | int ret; | |
1563 | struct qcom_glink *glink; | |
1564 | ||
1565 | glink = devm_kzalloc(dev, sizeof(*glink), GFP_KERNEL); | |
1566 | if (!glink) | |
1567 | return ERR_PTR(-ENOMEM); | |
1568 | ||
1569 | glink->dev = dev; | |
1570 | glink->tx_pipe = tx; | |
1571 | glink->rx_pipe = rx; | |
1572 | ||
d31ad615 | 1573 | glink->features = features; |
933b45da | 1574 | glink->intentless = intentless; |
d31ad615 | 1575 | |
29fc9b38 | 1576 | spin_lock_init(&glink->tx_lock); |
835764dd BA |
1577 | spin_lock_init(&glink->rx_lock); |
1578 | INIT_LIST_HEAD(&glink->rx_queue); | |
1579 | INIT_WORK(&glink->rx_work, qcom_glink_work); | |
1580 | ||
44f6df92 | 1581 | spin_lock_init(&glink->idr_lock); |
835764dd BA |
1582 | idr_init(&glink->lcids); |
1583 | idr_init(&glink->rcids); | |
1584 | ||
475452fc CL |
1585 | ret = of_property_read_string(dev->of_node, "label", &glink->name); |
1586 | if (ret < 0) | |
1587 | glink->name = dev->of_node->name; | |
1588 | ||
835764dd | 1589 | glink->mbox_client.dev = dev; |
38a9acb3 | 1590 | glink->mbox_client.knows_txdone = true; |
835764dd BA |
1591 | glink->mbox_chan = mbox_request_channel(&glink->mbox_client, 0); |
1592 | if (IS_ERR(glink->mbox_chan)) { | |
1593 | if (PTR_ERR(glink->mbox_chan) != -EPROBE_DEFER) | |
1594 | dev_err(dev, "failed to acquire IPC channel\n"); | |
1595 | return ERR_CAST(glink->mbox_chan); | |
1596 | } | |
1597 | ||
1598 | irq = of_irq_get(dev->of_node, 0); | |
1599 | ret = devm_request_irq(dev, irq, | |
1600 | qcom_glink_native_intr, | |
1601 | IRQF_NO_SUSPEND | IRQF_SHARED, | |
1602 | "glink-native", glink); | |
1603 | if (ret) { | |
1604 | dev_err(dev, "failed to request IRQ\n"); | |
1605 | return ERR_PTR(ret); | |
1606 | } | |
1607 | ||
1608 | glink->irq = irq; | |
1609 | ||
1610 | ret = qcom_glink_send_version(glink); | |
1611 | if (ret) | |
1612 | return ERR_PTR(ret); | |
1613 | ||
1614 | return glink; | |
1615 | } | |
f8ff9777 | 1616 | EXPORT_SYMBOL_GPL(qcom_glink_native_probe); |
835764dd BA |
1617 | |
1618 | static int qcom_glink_remove_device(struct device *dev, void *data) | |
1619 | { | |
1620 | device_unregister(dev); | |
1621 | ||
1622 | return 0; | |
1623 | } | |
1624 | ||
1625 | void qcom_glink_native_remove(struct qcom_glink *glink) | |
1626 | { | |
1627 | struct glink_channel *channel; | |
1628 | int cid; | |
1629 | int ret; | |
44f6df92 | 1630 | unsigned long flags; |
835764dd BA |
1631 | |
1632 | disable_irq(glink->irq); | |
1633 | cancel_work_sync(&glink->rx_work); | |
1634 | ||
1635 | ret = device_for_each_child(glink->dev, NULL, qcom_glink_remove_device); | |
1636 | if (ret) | |
1637 | dev_warn(glink->dev, "Can't remove GLINK devices: %d\n", ret); | |
1638 | ||
44f6df92 | 1639 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd BA |
1640 | /* Release any defunct local channels, waiting for close-ack */ |
1641 | idr_for_each_entry(&glink->lcids, channel, cid) | |
1642 | kref_put(&channel->refcount, qcom_glink_channel_release); | |
1643 | ||
b646293e CL |
1644 | /* Release any defunct local channels, waiting for close-req */ |
1645 | idr_for_each_entry(&glink->rcids, channel, cid) | |
1646 | kref_put(&channel->refcount, qcom_glink_channel_release); | |
1647 | ||
835764dd BA |
1648 | idr_destroy(&glink->lcids); |
1649 | idr_destroy(&glink->rcids); | |
44f6df92 | 1650 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
76cf1105 | 1651 | mbox_free_channel(glink->mbox_chan); |
835764dd | 1652 | } |
f8ff9777 | 1653 | EXPORT_SYMBOL_GPL(qcom_glink_native_remove); |
caf989c3 BA |
1654 | |
1655 | void qcom_glink_native_unregister(struct qcom_glink *glink) | |
1656 | { | |
1657 | device_unregister(glink->dev); | |
1658 | } | |
f8ff9777 | 1659 | EXPORT_SYMBOL_GPL(qcom_glink_native_unregister); |
1e0d5615 BA |
1660 | |
1661 | MODULE_DESCRIPTION("Qualcomm GLINK driver"); | |
1662 | MODULE_LICENSE("GPL v2"); |