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x86/unwinder: Handle stack overflows more gracefully
[linux/fpc-iii.git] / drivers / rpmsg / qcom_glink_native.c
blob5dcc9bf1c5bc5de65af2bfc5d778c4d494b20cee
1 /*
2 * Copyright (c) 2016-2017, Linaro Ltd
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 and
6 * only version 2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
13
14 #include <linux/idr.h>
15 #include <linux/interrupt.h>
16 #include <linux/io.h>
17 #include <linux/list.h>
18 #include <linux/mfd/syscon.h>
19 #include <linux/module.h>
20 #include <linux/of.h>
21 #include <linux/of_address.h>
22 #include <linux/of_irq.h>
23 #include <linux/platform_device.h>
24 #include <linux/regmap.h>
25 #include <linux/rpmsg.h>
26 #include <linux/sizes.h>
27 #include <linux/slab.h>
28 #include <linux/workqueue.h>
29 #include <linux/mailbox_client.h>
30
31 #include "rpmsg_internal.h"
32 #include "qcom_glink_native.h"
33
34 #define GLINK_NAME_SIZE 32
35 #define GLINK_VERSION_1 1
36
37 #define RPM_GLINK_CID_MIN 1
38 #define RPM_GLINK_CID_MAX 65536
39
40 struct glink_msg {
41 __le16 cmd;
42 __le16 param1;
43 __le32 param2;
44 u8 data[];
45 } __packed;
46
47 /**
48 * struct glink_defer_cmd - deferred incoming control message
49 * @node: list node
50 * @msg: message header
51 * data: payload of the message
52 *
53 * Copy of a received control message, to be added to @rx_queue and processed
54 * by @rx_work of @qcom_glink.
55 */
56 struct glink_defer_cmd {
57 struct list_head node;
58
59 struct glink_msg msg;
60 u8 data[];
61 };
62
63 /**
64 * struct glink_core_rx_intent - RX intent
65 * RX intent
66 *
67 * data: pointer to the data (may be NULL for zero-copy)
68 * id: remote or local intent ID
69 * size: size of the original intent (do not modify)
70 * reuse: To mark if the intent can be reused after first use
71 * in_use: To mark if intent is already in use for the channel
72 * offset: next write offset (initially 0)
73 */
74 struct glink_core_rx_intent {
75 void *data;
76 u32 id;
77 size_t size;
78 bool reuse;
79 bool in_use;
80 u32 offset;
81
82 struct list_head node;
83 };
84
85 /**
86 * struct qcom_glink - driver context, relates to one remote subsystem
87 * @dev: reference to the associated struct device
88 * @mbox_client: mailbox client
89 * @mbox_chan: mailbox channel
90 * @rx_pipe: pipe object for receive FIFO
91 * @tx_pipe: pipe object for transmit FIFO
92 * @irq: IRQ for signaling incoming events
93 * @rx_work: worker for handling received control messages
94 * @rx_lock: protects the @rx_queue
95 * @rx_queue: queue of received control messages to be processed in @rx_work
96 * @tx_lock: synchronizes operations on the tx fifo
97 * @idr_lock: synchronizes @lcids and @rcids modifications
98 * @lcids: idr of all channels with a known local channel id
99 * @rcids: idr of all channels with a known remote channel id
100 */
101 struct qcom_glink {
102 struct device *dev;
103
104 struct mbox_client mbox_client;
105 struct mbox_chan *mbox_chan;
106
107 struct qcom_glink_pipe *rx_pipe;
108 struct qcom_glink_pipe *tx_pipe;
109
110 int irq;
111
112 struct work_struct rx_work;
113 spinlock_t rx_lock;
114 struct list_head rx_queue;
115
116 struct mutex tx_lock;
117
118 spinlock_t idr_lock;
119 struct idr lcids;
120 struct idr rcids;
121 unsigned long features;
122
123 bool intentless;
124 };
125
126 enum {
127 GLINK_STATE_CLOSED,
128 GLINK_STATE_OPENING,
129 GLINK_STATE_OPEN,
130 GLINK_STATE_CLOSING,
131 };
132
133 /**
134 * struct glink_channel - internal representation of a channel
135 * @rpdev: rpdev reference, only used for primary endpoints
136 * @ept: rpmsg endpoint this channel is associated with
137 * @glink: qcom_glink context handle
138 * @refcount: refcount for the channel object
139 * @recv_lock: guard for @ept.cb
140 * @name: unique channel name/identifier
141 * @lcid: channel id, in local space
142 * @rcid: channel id, in remote space
143 * @intent_lock: lock for protection of @liids, @riids
144 * @liids: idr of all local intents
145 * @riids: idr of all remote intents
146 * @intent_work: worker responsible for transmitting rx_done packets
147 * @done_intents: list of intents that needs to be announced rx_done
148 * @buf: receive buffer, for gathering fragments
149 * @buf_offset: write offset in @buf
150 * @buf_size: size of current @buf
151 * @open_ack: completed once remote has acked the open-request
152 * @open_req: completed once open-request has been received
153 * @intent_req_lock: Synchronises multiple intent requests
154 * @intent_req_result: Result of intent request
155 * @intent_req_comp: Completion for intent_req signalling
156 */
157 struct glink_channel {
158 struct rpmsg_endpoint ept;
159
160 struct rpmsg_device *rpdev;
161 struct qcom_glink *glink;
162
163 struct kref refcount;
164
165 spinlock_t recv_lock;
166
167 char *name;
168 unsigned int lcid;
169 unsigned int rcid;
170
171 spinlock_t intent_lock;
172 struct idr liids;
173 struct idr riids;
174 struct work_struct intent_work;
175 struct list_head done_intents;
176
177 struct glink_core_rx_intent *buf;
178 int buf_offset;
179 int buf_size;
180
181 struct completion open_ack;
182 struct completion open_req;
183
184 struct mutex intent_req_lock;
185 bool intent_req_result;
186 struct completion intent_req_comp;
187 };
188
189 #define to_glink_channel(_ept) container_of(_ept, struct glink_channel, ept)
190
191 static const struct rpmsg_endpoint_ops glink_endpoint_ops;
192
193 #define RPM_CMD_VERSION 0
194 #define RPM_CMD_VERSION_ACK 1
195 #define RPM_CMD_OPEN 2
196 #define RPM_CMD_CLOSE 3
197 #define RPM_CMD_OPEN_ACK 4
198 #define RPM_CMD_INTENT 5
199 #define RPM_CMD_RX_DONE 6
200 #define RPM_CMD_RX_INTENT_REQ 7
201 #define RPM_CMD_RX_INTENT_REQ_ACK 8
202 #define RPM_CMD_TX_DATA 9
203 #define RPM_CMD_CLOSE_ACK 11
204 #define RPM_CMD_TX_DATA_CONT 12
205 #define RPM_CMD_READ_NOTIF 13
206 #define RPM_CMD_RX_DONE_W_REUSE 14
207
208 #define GLINK_FEATURE_INTENTLESS BIT(1)
209
210 static void qcom_glink_rx_done_work(struct work_struct *work);
211
212 static struct glink_channel *qcom_glink_alloc_channel(struct qcom_glink *glink,
213 const char *name)
214 {
215 struct glink_channel *channel;
216
217 channel = kzalloc(sizeof(*channel), GFP_KERNEL);
218 if (!channel)
219 return ERR_PTR(-ENOMEM);
220
221 /* Setup glink internal glink_channel data */
222 spin_lock_init(&channel->recv_lock);
223 spin_lock_init(&channel->intent_lock);
224
225 channel->glink = glink;
226 channel->name = kstrdup(name, GFP_KERNEL);
227
228 init_completion(&channel->open_req);
229 init_completion(&channel->open_ack);
230
231 INIT_LIST_HEAD(&channel->done_intents);
232 INIT_WORK(&channel->intent_work, qcom_glink_rx_done_work);
233
234 idr_init(&channel->liids);
235 idr_init(&channel->riids);
236 kref_init(&channel->refcount);
237
238 return channel;
239 }
240
241 static void qcom_glink_channel_release(struct kref *ref)
242 {
243 struct glink_channel *channel = container_of(ref, struct glink_channel,
244 refcount);
245 unsigned long flags;
246
247 spin_lock_irqsave(&channel->intent_lock, flags);
248 idr_destroy(&channel->liids);
249 idr_destroy(&channel->riids);
250 spin_unlock_irqrestore(&channel->intent_lock, flags);
251
252 kfree(channel->name);
253 kfree(channel);
254 }
255
256 static size_t qcom_glink_rx_avail(struct qcom_glink *glink)
257 {
258 return glink->rx_pipe->avail(glink->rx_pipe);
259 }
260
261 static void qcom_glink_rx_peak(struct qcom_glink *glink,
262 void *data, unsigned int offset, size_t count)
263 {
264 glink->rx_pipe->peak(glink->rx_pipe, data, offset, count);
265 }
266
267 static void qcom_glink_rx_advance(struct qcom_glink *glink, size_t count)
268 {
269 glink->rx_pipe->advance(glink->rx_pipe, count);
270 }
271
272 static size_t qcom_glink_tx_avail(struct qcom_glink *glink)
273 {
274 return glink->tx_pipe->avail(glink->tx_pipe);
275 }
276
277 static void qcom_glink_tx_write(struct qcom_glink *glink,
278 const void *hdr, size_t hlen,
279 const void *data, size_t dlen)
280 {
281 glink->tx_pipe->write(glink->tx_pipe, hdr, hlen, data, dlen);
282 }
283
284 static int qcom_glink_tx(struct qcom_glink *glink,
285 const void *hdr, size_t hlen,
286 const void *data, size_t dlen, bool wait)
287 {
288 unsigned int tlen = hlen + dlen;
289 int ret;
290
291 /* Reject packets that are too big */
292 if (tlen >= glink->tx_pipe->length)
293 return -EINVAL;
294
295 ret = mutex_lock_interruptible(&glink->tx_lock);
296 if (ret)
297 return ret;
298
299 while (qcom_glink_tx_avail(glink) < tlen) {
300 if (!wait) {
301 ret = -EAGAIN;
302 goto out;
303 }
304
305 usleep_range(10000, 15000);
306 }
307
308 qcom_glink_tx_write(glink, hdr, hlen, data, dlen);
309
310 mbox_send_message(glink->mbox_chan, NULL);
311 mbox_client_txdone(glink->mbox_chan, 0);
312
313 out:
314 mutex_unlock(&glink->tx_lock);
315
316 return ret;
317 }
318
319 static int qcom_glink_send_version(struct qcom_glink *glink)
320 {
321 struct glink_msg msg;
322
323 msg.cmd = cpu_to_le16(RPM_CMD_VERSION);
324 msg.param1 = cpu_to_le16(GLINK_VERSION_1);
325 msg.param2 = cpu_to_le32(glink->features);
326
327 return qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
328 }
329
330 static void qcom_glink_send_version_ack(struct qcom_glink *glink)
331 {
332 struct glink_msg msg;
333
334 msg.cmd = cpu_to_le16(RPM_CMD_VERSION_ACK);
335 msg.param1 = cpu_to_le16(GLINK_VERSION_1);
336 msg.param2 = cpu_to_le32(glink->features);
337
338 qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
339 }
340
341 static void qcom_glink_send_open_ack(struct qcom_glink *glink,
342 struct glink_channel *channel)
343 {
344 struct glink_msg msg;
345
346 msg.cmd = cpu_to_le16(RPM_CMD_OPEN_ACK);
347 msg.param1 = cpu_to_le16(channel->rcid);
348 msg.param2 = cpu_to_le32(0);
349
350 qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
351 }
352
353 static void qcom_glink_handle_intent_req_ack(struct qcom_glink *glink,
354 unsigned int cid, bool granted)
355 {
356 struct glink_channel *channel;
357 unsigned long flags;
358
359 spin_lock_irqsave(&glink->idr_lock, flags);
360 channel = idr_find(&glink->rcids, cid);
361 spin_unlock_irqrestore(&glink->idr_lock, flags);
362 if (!channel) {
363 dev_err(glink->dev, "unable to find channel\n");
364 return;
365 }
366
367 channel->intent_req_result = granted;
368 complete(&channel->intent_req_comp);
369 }
370
371 /**
372 * qcom_glink_send_open_req() - send a RPM_CMD_OPEN request to the remote
373 * @glink: Ptr to the glink edge
374 * @channel: Ptr to the channel that the open req is sent
375 *
376 * Allocates a local channel id and sends a RPM_CMD_OPEN message to the remote.
377 * Will return with refcount held, regardless of outcome.
378 *
379 * Returns 0 on success, negative errno otherwise.
380 */
381 static int qcom_glink_send_open_req(struct qcom_glink *glink,
382 struct glink_channel *channel)
383 {
384 struct {
385 struct glink_msg msg;
386 u8 name[GLINK_NAME_SIZE];
387 } __packed req;
388 int name_len = strlen(channel->name) + 1;
389 int req_len = ALIGN(sizeof(req.msg) + name_len, 8);
390 int ret;
391 unsigned long flags;
392
393 kref_get(&channel->refcount);
394
395 spin_lock_irqsave(&glink->idr_lock, flags);
396 ret = idr_alloc_cyclic(&glink->lcids, channel,
397 RPM_GLINK_CID_MIN, RPM_GLINK_CID_MAX,
398 GFP_ATOMIC);
399 spin_unlock_irqrestore(&glink->idr_lock, flags);
400 if (ret < 0)
401 return ret;
402
403 channel->lcid = ret;
404
405 req.msg.cmd = cpu_to_le16(RPM_CMD_OPEN);
406 req.msg.param1 = cpu_to_le16(channel->lcid);
407 req.msg.param2 = cpu_to_le32(name_len);
408 strcpy(req.name, channel->name);
409
410 ret = qcom_glink_tx(glink, &req, req_len, NULL, 0, true);
411 if (ret)
412 goto remove_idr;
413
414 return 0;
415
416 remove_idr:
417 spin_lock_irqsave(&glink->idr_lock, flags);
418 idr_remove(&glink->lcids, channel->lcid);
419 channel->lcid = 0;
420 spin_unlock_irqrestore(&glink->idr_lock, flags);
421
422 return ret;
423 }
424
425 static void qcom_glink_send_close_req(struct qcom_glink *glink,
426 struct glink_channel *channel)
427 {
428 struct glink_msg req;
429
430 req.cmd = cpu_to_le16(RPM_CMD_CLOSE);
431 req.param1 = cpu_to_le16(channel->lcid);
432 req.param2 = 0;
433
434 qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true);
435 }
436
437 static void qcom_glink_send_close_ack(struct qcom_glink *glink,
438 unsigned int rcid)
439 {
440 struct glink_msg req;
441
442 req.cmd = cpu_to_le16(RPM_CMD_CLOSE_ACK);
443 req.param1 = cpu_to_le16(rcid);
444 req.param2 = 0;
445
446 qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true);
447 }
448
449 static void qcom_glink_rx_done_work(struct work_struct *work)
450 {
451 struct glink_channel *channel = container_of(work, struct glink_channel,
452 intent_work);
453 struct qcom_glink *glink = channel->glink;
454 struct glink_core_rx_intent *intent, *tmp;
455 struct {
456 u16 id;
457 u16 lcid;
458 u32 liid;
459 } __packed cmd;
460
461 unsigned int cid = channel->lcid;
462 unsigned int iid;
463 bool reuse;
464 unsigned long flags;
465
466 spin_lock_irqsave(&channel->intent_lock, flags);
467 list_for_each_entry_safe(intent, tmp, &channel->done_intents, node) {
468 list_del(&intent->node);
469 spin_unlock_irqrestore(&channel->intent_lock, flags);
470 iid = intent->id;
471 reuse = intent->reuse;
472
473 cmd.id = reuse ? RPM_CMD_RX_DONE_W_REUSE : RPM_CMD_RX_DONE;
474 cmd.lcid = cid;
475 cmd.liid = iid;
476
477 qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true);
478 if (!reuse) {
479 kfree(intent->data);
480 kfree(intent);
481 }
482 spin_lock_irqsave(&channel->intent_lock, flags);
483 }
484 spin_unlock_irqrestore(&channel->intent_lock, flags);
485 }
486
487 static void qcom_glink_rx_done(struct qcom_glink *glink,
488 struct glink_channel *channel,
489 struct glink_core_rx_intent *intent)
490 {
491 /* We don't send RX_DONE to intentless systems */
492 if (glink->intentless) {
493 kfree(intent->data);
494 kfree(intent);
495 return;
496 }
497
498 /* Take it off the tree of receive intents */
499 if (!intent->reuse) {
500 spin_lock(&channel->intent_lock);
501 idr_remove(&channel->liids, intent->id);
502 spin_unlock(&channel->intent_lock);
503 }
504
505 /* Schedule the sending of a rx_done indication */
506 spin_lock(&channel->intent_lock);
507 list_add_tail(&intent->node, &channel->done_intents);
508 spin_unlock(&channel->intent_lock);
509
510 schedule_work(&channel->intent_work);
511 }
512
513 /**
514 * qcom_glink_receive_version() - receive version/features from remote system
515 *
516 * @glink: pointer to transport interface
517 * @r_version: remote version
518 * @r_features: remote features
519 *
520 * This function is called in response to a remote-initiated version/feature
521 * negotiation sequence.
522 */
523 static void qcom_glink_receive_version(struct qcom_glink *glink,
524 u32 version,
525 u32 features)
526 {
527 switch (version) {
528 case 0:
529 break;
530 case GLINK_VERSION_1:
531 glink->features &= features;
532 /* FALLTHROUGH */
533 default:
534 qcom_glink_send_version_ack(glink);
535 break;
536 }
537 }
538
539 /**
540 * qcom_glink_receive_version_ack() - receive negotiation ack from remote system
541 *
542 * @glink: pointer to transport interface
543 * @r_version: remote version response
544 * @r_features: remote features response
545 *
546 * This function is called in response to a local-initiated version/feature
547 * negotiation sequence and is the counter-offer from the remote side based
548 * upon the initial version and feature set requested.
549 */
550 static void qcom_glink_receive_version_ack(struct qcom_glink *glink,
551 u32 version,
552 u32 features)
553 {
554 switch (version) {
555 case 0:
556 /* Version negotiation failed */
557 break;
558 case GLINK_VERSION_1:
559 if (features == glink->features)
560 break;
561
562 glink->features &= features;
563 /* FALLTHROUGH */
564 default:
565 qcom_glink_send_version(glink);
566 break;
567 }
568 }
569
570 /**
571 * qcom_glink_send_intent_req_ack() - convert an rx intent request ack cmd to
572 wire format and transmit
573 * @glink: The transport to transmit on.
574 * @channel: The glink channel
575 * @granted: The request response to encode.
576 *
577 * Return: 0 on success or standard Linux error code.
578 */
579 static int qcom_glink_send_intent_req_ack(struct qcom_glink *glink,
580 struct glink_channel *channel,
581 bool granted)
582 {
583 struct glink_msg msg;
584
585 msg.cmd = cpu_to_le16(RPM_CMD_RX_INTENT_REQ_ACK);
586 msg.param1 = cpu_to_le16(channel->lcid);
587 msg.param2 = cpu_to_le32(granted);
588
589 qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
590
591 return 0;
592 }
593
594 /**
595 * qcom_glink_advertise_intent - convert an rx intent cmd to wire format and
596 * transmit
597 * @glink: The transport to transmit on.
598 * @channel: The local channel
599 * @size: The intent to pass on to remote.
600 *
601 * Return: 0 on success or standard Linux error code.
602 */
603 static int qcom_glink_advertise_intent(struct qcom_glink *glink,
604 struct glink_channel *channel,
605 struct glink_core_rx_intent *intent)
606 {
607 struct command {
608 u16 id;
609 u16 lcid;
610 u32 count;
611 u32 size;
612 u32 liid;
613 } __packed;
614 struct command cmd;
615
616 cmd.id = cpu_to_le16(RPM_CMD_INTENT);
617 cmd.lcid = cpu_to_le16(channel->lcid);
618 cmd.count = cpu_to_le32(1);
619 cmd.size = cpu_to_le32(intent->size);
620 cmd.liid = cpu_to_le32(intent->id);
621
622 qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true);
623
624 return 0;
625 }
626
627 static struct glink_core_rx_intent *
628 qcom_glink_alloc_intent(struct qcom_glink *glink,
629 struct glink_channel *channel,
630 size_t size,
631 bool reuseable)
632 {
633 struct glink_core_rx_intent *intent;
634 int ret;
635 unsigned long flags;
636
637 intent = kzalloc(sizeof(*intent), GFP_KERNEL);
638 if (!intent)
639 return NULL;
640
641 intent->data = kzalloc(size, GFP_KERNEL);
642 if (!intent->data)
643 goto free_intent;
644
645 spin_lock_irqsave(&channel->intent_lock, flags);
646 ret = idr_alloc_cyclic(&channel->liids, intent, 1, -1, GFP_ATOMIC);
647 if (ret < 0) {
648 spin_unlock_irqrestore(&channel->intent_lock, flags);
649 goto free_data;
650 }
651 spin_unlock_irqrestore(&channel->intent_lock, flags);
652
653 intent->id = ret;
654 intent->size = size;
655 intent->reuse = reuseable;
656
657 return intent;
658
659 free_data:
660 kfree(intent->data);
661 free_intent:
662 kfree(intent);
663 return NULL;
664 }
665
666 static void qcom_glink_handle_rx_done(struct qcom_glink *glink,
667 u32 cid, uint32_t iid,
668 bool reuse)
669 {
670 struct glink_core_rx_intent *intent;
671 struct glink_channel *channel;
672 unsigned long flags;
673
674 spin_lock_irqsave(&glink->idr_lock, flags);
675 channel = idr_find(&glink->rcids, cid);
676 spin_unlock_irqrestore(&glink->idr_lock, flags);
677 if (!channel) {
678 dev_err(glink->dev, "invalid channel id received\n");
679 return;
680 }
681
682 spin_lock_irqsave(&channel->intent_lock, flags);
683 intent = idr_find(&channel->riids, iid);
684
685 if (!intent) {
686 spin_unlock_irqrestore(&channel->intent_lock, flags);
687 dev_err(glink->dev, "invalid intent id received\n");
688 return;
689 }
690
691 intent->in_use = false;
692
693 if (!reuse) {
694 idr_remove(&channel->riids, intent->id);
695 kfree(intent);
696 }
697 spin_unlock_irqrestore(&channel->intent_lock, flags);
698 }
699
700 /**
701 * qcom_glink_handle_intent_req() - Receive a request for rx_intent
702 * from remote side
703 * if_ptr: Pointer to the transport interface
704 * rcid: Remote channel ID
705 * size: size of the intent
706 *
707 * The function searches for the local channel to which the request for
708 * rx_intent has arrived and allocates and notifies the remote back
709 */
710 static void qcom_glink_handle_intent_req(struct qcom_glink *glink,
711 u32 cid, size_t size)
712 {
713 struct glink_core_rx_intent *intent;
714 struct glink_channel *channel;
715 unsigned long flags;
716
717 spin_lock_irqsave(&glink->idr_lock, flags);
718 channel = idr_find(&glink->rcids, cid);
719 spin_unlock_irqrestore(&glink->idr_lock, flags);
720
721 if (!channel) {
722 pr_err("%s channel not found for cid %d\n", __func__, cid);
723 return;
724 }
725
726 intent = qcom_glink_alloc_intent(glink, channel, size, false);
727 if (intent)
728 qcom_glink_advertise_intent(glink, channel, intent);
729
730 qcom_glink_send_intent_req_ack(glink, channel, !!intent);
731 }
732
733 static int qcom_glink_rx_defer(struct qcom_glink *glink, size_t extra)
734 {
735 struct glink_defer_cmd *dcmd;
736
737 extra = ALIGN(extra, 8);
738
739 if (qcom_glink_rx_avail(glink) < sizeof(struct glink_msg) + extra) {
740 dev_dbg(glink->dev, "Insufficient data in rx fifo");
741 return -ENXIO;
742 }
743
744 dcmd = kzalloc(sizeof(*dcmd) + extra, GFP_ATOMIC);
745 if (!dcmd)
746 return -ENOMEM;
747
748 INIT_LIST_HEAD(&dcmd->node);
749
750 qcom_glink_rx_peak(glink, &dcmd->msg, 0, sizeof(dcmd->msg) + extra);
751
752 spin_lock(&glink->rx_lock);
753 list_add_tail(&dcmd->node, &glink->rx_queue);
754 spin_unlock(&glink->rx_lock);
755
756 schedule_work(&glink->rx_work);
757 qcom_glink_rx_advance(glink, sizeof(dcmd->msg) + extra);
758
759 return 0;
760 }
761
762 static int qcom_glink_rx_data(struct qcom_glink *glink, size_t avail)
763 {
764 struct glink_core_rx_intent *intent;
765 struct glink_channel *channel;
766 struct {
767 struct glink_msg msg;
768 __le32 chunk_size;
769 __le32 left_size;
770 } __packed hdr;
771 unsigned int chunk_size;
772 unsigned int left_size;
773 unsigned int rcid;
774 unsigned int liid;
775 int ret = 0;
776 unsigned long flags;
777
778 if (avail < sizeof(hdr)) {
779 dev_dbg(glink->dev, "Not enough data in fifo\n");
780 return -EAGAIN;
781 }
782
783 qcom_glink_rx_peak(glink, &hdr, 0, sizeof(hdr));
784 chunk_size = le32_to_cpu(hdr.chunk_size);
785 left_size = le32_to_cpu(hdr.left_size);
786
787 if (avail < sizeof(hdr) + chunk_size) {
788 dev_dbg(glink->dev, "Payload not yet in fifo\n");
789 return -EAGAIN;
790 }
791
792 if (WARN(chunk_size % 4, "Incoming data must be word aligned\n"))
793 return -EINVAL;
794
795 rcid = le16_to_cpu(hdr.msg.param1);
796 spin_lock_irqsave(&glink->idr_lock, flags);
797 channel = idr_find(&glink->rcids, rcid);
798 spin_unlock_irqrestore(&glink->idr_lock, flags);
799 if (!channel) {
800 dev_dbg(glink->dev, "Data on non-existing channel\n");
801
802 /* Drop the message */
803 goto advance_rx;
804 }
805
806 if (glink->intentless) {
807 /* Might have an ongoing, fragmented, message to append */
808 if (!channel->buf) {
809 intent = kzalloc(sizeof(*intent), GFP_ATOMIC);
810 if (!intent)
811 return -ENOMEM;
812
813 intent->data = kmalloc(chunk_size + left_size,
814 GFP_ATOMIC);
815 if (!intent->data) {
816 kfree(intent);
817 return -ENOMEM;
818 }
819
820 intent->id = 0xbabababa;
821 intent->size = chunk_size + left_size;
822 intent->offset = 0;
823
824 channel->buf = intent;
825 } else {
826 intent = channel->buf;
827 }
828 } else {
829 liid = le32_to_cpu(hdr.msg.param2);
830
831 spin_lock_irqsave(&channel->intent_lock, flags);
832 intent = idr_find(&channel->liids, liid);
833 spin_unlock_irqrestore(&channel->intent_lock, flags);
834
835 if (!intent) {
836 dev_err(glink->dev,
837 "no intent found for channel %s intent %d",
838 channel->name, liid);
839 goto advance_rx;
840 }
841 }
842
843 if (intent->size - intent->offset < chunk_size) {
844 dev_err(glink->dev, "Insufficient space in intent\n");
845
846 /* The packet header lied, drop payload */
847 goto advance_rx;
848 }
849
850 qcom_glink_rx_peak(glink, intent->data + intent->offset,
851 sizeof(hdr), chunk_size);
852 intent->offset += chunk_size;
853
854 /* Handle message when no fragments remain to be received */
855 if (!left_size) {
856 spin_lock(&channel->recv_lock);
857 if (channel->ept.cb) {
858 channel->ept.cb(channel->ept.rpdev,
859 intent->data,
860 intent->offset,
861 channel->ept.priv,
862 RPMSG_ADDR_ANY);
863 }
864 spin_unlock(&channel->recv_lock);
865
866 intent->offset = 0;
867 channel->buf = NULL;
868
869 qcom_glink_rx_done(glink, channel, intent);
870 }
871
872 advance_rx:
873 qcom_glink_rx_advance(glink, ALIGN(sizeof(hdr) + chunk_size, 8));
874
875 return ret;
876 }
877
878 static void qcom_glink_handle_intent(struct qcom_glink *glink,
879 unsigned int cid,
880 unsigned int count,
881 size_t avail)
882 {
883 struct glink_core_rx_intent *intent;
884 struct glink_channel *channel;
885 struct intent_pair {
886 __le32 size;
887 __le32 iid;
888 };
889
890 struct {
891 struct glink_msg msg;
892 struct intent_pair intents[];
893 } __packed * msg;
894
895 const size_t msglen = sizeof(*msg) + sizeof(struct intent_pair) * count;
896 int ret;
897 int i;
898 unsigned long flags;
899
900 if (avail < msglen) {
901 dev_dbg(glink->dev, "Not enough data in fifo\n");
902 return;
903 }
904
905 spin_lock_irqsave(&glink->idr_lock, flags);
906 channel = idr_find(&glink->rcids, cid);
907 spin_unlock_irqrestore(&glink->idr_lock, flags);
908 if (!channel) {
909 dev_err(glink->dev, "intents for non-existing channel\n");
910 return;
911 }
912
913 msg = kmalloc(msglen, GFP_ATOMIC);
914 if (!msg)
915 return;
916
917 qcom_glink_rx_peak(glink, msg, 0, msglen);
918
919 for (i = 0; i < count; ++i) {
920 intent = kzalloc(sizeof(*intent), GFP_ATOMIC);
921 if (!intent)
922 break;
923
924 intent->id = le32_to_cpu(msg->intents[i].iid);
925 intent->size = le32_to_cpu(msg->intents[i].size);
926
927 spin_lock_irqsave(&channel->intent_lock, flags);
928 ret = idr_alloc(&channel->riids, intent,
929 intent->id, intent->id + 1, GFP_ATOMIC);
930 spin_unlock_irqrestore(&channel->intent_lock, flags);
931
932 if (ret < 0)
933 dev_err(glink->dev, "failed to store remote intent\n");
934 }
935
936 kfree(msg);
937 qcom_glink_rx_advance(glink, ALIGN(msglen, 8));
938 }
939
940 static int qcom_glink_rx_open_ack(struct qcom_glink *glink, unsigned int lcid)
941 {
942 struct glink_channel *channel;
943
944 spin_lock(&glink->idr_lock);
945 channel = idr_find(&glink->lcids, lcid);
946 spin_unlock(&glink->idr_lock);
947 if (!channel) {
948 dev_err(glink->dev, "Invalid open ack packet\n");
949 return -EINVAL;
950 }
951
952 complete(&channel->open_ack);
953
954 return 0;
955 }
956
957 static irqreturn_t qcom_glink_native_intr(int irq, void *data)
958 {
959 struct qcom_glink *glink = data;
960 struct glink_msg msg;
961 unsigned int param1;
962 unsigned int param2;
963 unsigned int avail;
964 unsigned int cmd;
965 int ret = 0;
966
967 for (;;) {
968 avail = qcom_glink_rx_avail(glink);
969 if (avail < sizeof(msg))
970 break;
971
972 qcom_glink_rx_peak(glink, &msg, 0, sizeof(msg));
973
974 cmd = le16_to_cpu(msg.cmd);
975 param1 = le16_to_cpu(msg.param1);
976 param2 = le32_to_cpu(msg.param2);
977
978 switch (cmd) {
979 case RPM_CMD_VERSION:
980 case RPM_CMD_VERSION_ACK:
981 case RPM_CMD_CLOSE:
982 case RPM_CMD_CLOSE_ACK:
983 case RPM_CMD_RX_INTENT_REQ:
984 ret = qcom_glink_rx_defer(glink, 0);
985 break;
986 case RPM_CMD_OPEN_ACK:
987 ret = qcom_glink_rx_open_ack(glink, param1);
988 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
989 break;
990 case RPM_CMD_OPEN:
991 ret = qcom_glink_rx_defer(glink, param2);
992 break;
993 case RPM_CMD_TX_DATA:
994 case RPM_CMD_TX_DATA_CONT:
995 ret = qcom_glink_rx_data(glink, avail);
996 break;
997 case RPM_CMD_READ_NOTIF:
998 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
999
1000 mbox_send_message(glink->mbox_chan, NULL);
1001 mbox_client_txdone(glink->mbox_chan, 0);
1002 break;
1003 case RPM_CMD_INTENT:
1004 qcom_glink_handle_intent(glink, param1, param2, avail);
1005 break;
1006 case RPM_CMD_RX_DONE:
1007 qcom_glink_handle_rx_done(glink, param1, param2, false);
1008 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
1009 break;
1010 case RPM_CMD_RX_DONE_W_REUSE:
1011 qcom_glink_handle_rx_done(glink, param1, param2, true);
1012 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
1013 break;
1014 case RPM_CMD_RX_INTENT_REQ_ACK:
1015 qcom_glink_handle_intent_req_ack(glink, param1, param2);
1016 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
1017 break;
1018 default:
1019 dev_err(glink->dev, "unhandled rx cmd: %d\n", cmd);
1020 ret = -EINVAL;
1021 break;
1022 }
1023
1024 if (ret)
1025 break;
1026 }
1027
1028 return IRQ_HANDLED;
1029 }
1030
1031 /* Locally initiated rpmsg_create_ept */
1032 static struct glink_channel *qcom_glink_create_local(struct qcom_glink *glink,
1033 const char *name)
1034 {
1035 struct glink_channel *channel;
1036 int ret;
1037 unsigned long flags;
1038
1039 channel = qcom_glink_alloc_channel(glink, name);
1040 if (IS_ERR(channel))
1041 return ERR_CAST(channel);
1042
1043 ret = qcom_glink_send_open_req(glink, channel);
1044 if (ret)
1045 goto release_channel;
1046
1047 ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ);
1048 if (!ret)
1049 goto err_timeout;
1050
1051 ret = wait_for_completion_timeout(&channel->open_req, 5 * HZ);
1052 if (!ret)
1053 goto err_timeout;
1054
1055 qcom_glink_send_open_ack(glink, channel);
1056
1057 return channel;
1058
1059 err_timeout:
1060 /* qcom_glink_send_open_req() did register the channel in lcids*/
1061 spin_lock_irqsave(&glink->idr_lock, flags);
1062 idr_remove(&glink->lcids, channel->lcid);
1063 spin_unlock_irqrestore(&glink->idr_lock, flags);
1064
1065 release_channel:
1066 /* Release qcom_glink_send_open_req() reference */
1067 kref_put(&channel->refcount, qcom_glink_channel_release);
1068 /* Release qcom_glink_alloc_channel() reference */
1069 kref_put(&channel->refcount, qcom_glink_channel_release);
1070
1071 return ERR_PTR(-ETIMEDOUT);
1072 }
1073
1074 /* Remote initiated rpmsg_create_ept */
1075 static int qcom_glink_create_remote(struct qcom_glink *glink,
1076 struct glink_channel *channel)
1077 {
1078 int ret;
1079
1080 qcom_glink_send_open_ack(glink, channel);
1081
1082 ret = qcom_glink_send_open_req(glink, channel);
1083 if (ret)
1084 goto close_link;
1085
1086 ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ);
1087 if (!ret) {
1088 ret = -ETIMEDOUT;
1089 goto close_link;
1090 }
1091
1092 return 0;
1093
1094 close_link:
1095 /*
1096 * Send a close request to "undo" our open-ack. The close-ack will
1097 * release the last reference.
1098 */
1099 qcom_glink_send_close_req(glink, channel);
1100
1101 /* Release qcom_glink_send_open_req() reference */
1102 kref_put(&channel->refcount, qcom_glink_channel_release);
1103
1104 return ret;
1105 }
1106
1107 static struct rpmsg_endpoint *qcom_glink_create_ept(struct rpmsg_device *rpdev,
1108 rpmsg_rx_cb_t cb,
1109 void *priv,
1110 struct rpmsg_channel_info
1111 chinfo)
1112 {
1113 struct glink_channel *parent = to_glink_channel(rpdev->ept);
1114 struct glink_channel *channel;
1115 struct qcom_glink *glink = parent->glink;
1116 struct rpmsg_endpoint *ept;
1117 const char *name = chinfo.name;
1118 int cid;
1119 int ret;
1120 unsigned long flags;
1121
1122 spin_lock_irqsave(&glink->idr_lock, flags);
1123 idr_for_each_entry(&glink->rcids, channel, cid) {
1124 if (!strcmp(channel->name, name))
1125 break;
1126 }
1127 spin_unlock_irqrestore(&glink->idr_lock, flags);
1128
1129 if (!channel) {
1130 channel = qcom_glink_create_local(glink, name);
1131 if (IS_ERR(channel))
1132 return NULL;
1133 } else {
1134 ret = qcom_glink_create_remote(glink, channel);
1135 if (ret)
1136 return NULL;
1137 }
1138
1139 ept = &channel->ept;
1140 ept->rpdev = rpdev;
1141 ept->cb = cb;
1142 ept->priv = priv;
1143 ept->ops = &glink_endpoint_ops;
1144
1145 return ept;
1146 }
1147
1148 static int qcom_glink_announce_create(struct rpmsg_device *rpdev)
1149 {
1150 struct glink_channel *channel = to_glink_channel(rpdev->ept);
1151 struct glink_core_rx_intent *intent;
1152 struct qcom_glink *glink = channel->glink;
1153 int num_intents = glink->intentless ? 0 : 5;
1154
1155 /* Channel is now open, advertise base set of intents */
1156 while (num_intents--) {
1157 intent = qcom_glink_alloc_intent(glink, channel, SZ_1K, true);
1158 if (!intent)
1159 break;
1160
1161 qcom_glink_advertise_intent(glink, channel, intent);
1162 }
1163
1164 return 0;
1165 }
1166
1167 static void qcom_glink_destroy_ept(struct rpmsg_endpoint *ept)
1168 {
1169 struct glink_channel *channel = to_glink_channel(ept);
1170 struct qcom_glink *glink = channel->glink;
1171 unsigned long flags;
1172
1173 spin_lock_irqsave(&channel->recv_lock, flags);
1174 channel->ept.cb = NULL;
1175 spin_unlock_irqrestore(&channel->recv_lock, flags);
1176
1177 /* Decouple the potential rpdev from the channel */
1178 channel->rpdev = NULL;
1179
1180 qcom_glink_send_close_req(glink, channel);
1181 }
1182
1183 static int qcom_glink_request_intent(struct qcom_glink *glink,
1184 struct glink_channel *channel,
1185 size_t size)
1186 {
1187 struct {
1188 u16 id;
1189 u16 cid;
1190 u32 size;
1191 } __packed cmd;
1192
1193 int ret;
1194
1195 mutex_lock(&channel->intent_req_lock);
1196
1197 reinit_completion(&channel->intent_req_comp);
1198
1199 cmd.id = RPM_CMD_RX_INTENT_REQ;
1200 cmd.cid = channel->lcid;
1201 cmd.size = size;
1202
1203 ret = qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true);
1204 if (ret)
1205 goto unlock;
1206
1207 ret = wait_for_completion_timeout(&channel->intent_req_comp, 10 * HZ);
1208 if (!ret) {
1209 dev_err(glink->dev, "intent request timed out\n");
1210 ret = -ETIMEDOUT;
1211 } else {
1212 ret = channel->intent_req_result ? 0 : -ECANCELED;
1213 }
1214
1215 unlock:
1216 mutex_unlock(&channel->intent_req_lock);
1217 return ret;
1218 }
1219
1220 static int __qcom_glink_send(struct glink_channel *channel,
1221 void *data, int len, bool wait)
1222 {
1223 struct qcom_glink *glink = channel->glink;
1224 struct glink_core_rx_intent *intent = NULL;
1225 struct glink_core_rx_intent *tmp;
1226 int iid = 0;
1227 struct {
1228 struct glink_msg msg;
1229 __le32 chunk_size;
1230 __le32 left_size;
1231 } __packed req;
1232 int ret;
1233 unsigned long flags;
1234
1235 if (!glink->intentless) {
1236 while (!intent) {
1237 spin_lock_irqsave(&channel->intent_lock, flags);
1238 idr_for_each_entry(&channel->riids, tmp, iid) {
1239 if (tmp->size >= len && !tmp->in_use) {
1240 tmp->in_use = true;
1241 intent = tmp;
1242 break;
1243 }
1244 }
1245 spin_unlock_irqrestore(&channel->intent_lock, flags);
1246
1247 /* We found an available intent */
1248 if (intent)
1249 break;
1250
1251 if (!wait)
1252 return -EBUSY;
1253
1254 ret = qcom_glink_request_intent(glink, channel, len);
1255 if (ret < 0)
1256 return ret;
1257 }
1258
1259 iid = intent->id;
1260 }
1261
1262 req.msg.cmd = cpu_to_le16(RPM_CMD_TX_DATA);
1263 req.msg.param1 = cpu_to_le16(channel->lcid);
1264 req.msg.param2 = cpu_to_le32(iid);
1265 req.chunk_size = cpu_to_le32(len);
1266 req.left_size = cpu_to_le32(0);
1267
1268 ret = qcom_glink_tx(glink, &req, sizeof(req), data, len, wait);
1269
1270 /* Mark intent available if we failed */
1271 if (ret && intent)
1272 intent->in_use = false;
1273
1274 return ret;
1275 }
1276
1277 static int qcom_glink_send(struct rpmsg_endpoint *ept, void *data, int len)
1278 {
1279 struct glink_channel *channel = to_glink_channel(ept);
1280
1281 return __qcom_glink_send(channel, data, len, true);
1282 }
1283
1284 static int qcom_glink_trysend(struct rpmsg_endpoint *ept, void *data, int len)
1285 {
1286 struct glink_channel *channel = to_glink_channel(ept);
1287
1288 return __qcom_glink_send(channel, data, len, false);
1289 }
1290
1291 /*
1292 * Finds the device_node for the glink child interested in this channel.
1293 */
1294 static struct device_node *qcom_glink_match_channel(struct device_node *node,
1295 const char *channel)
1296 {
1297 struct device_node *child;
1298 const char *name;
1299 const char *key;
1300 int ret;
1301
1302 for_each_available_child_of_node(node, child) {
1303 key = "qcom,glink-channels";
1304 ret = of_property_read_string(child, key, &name);
1305 if (ret)
1306 continue;
1307
1308 if (strcmp(name, channel) == 0)
1309 return child;
1310 }
1311
1312 return NULL;
1313 }
1314
1315 static const struct rpmsg_device_ops glink_device_ops = {
1316 .create_ept = qcom_glink_create_ept,
1317 .announce_create = qcom_glink_announce_create,
1318 };
1319
1320 static const struct rpmsg_endpoint_ops glink_endpoint_ops = {
1321 .destroy_ept = qcom_glink_destroy_ept,
1322 .send = qcom_glink_send,
1323 .trysend = qcom_glink_trysend,
1324 };
1325
1326 static void qcom_glink_rpdev_release(struct device *dev)
1327 {
1328 struct rpmsg_device *rpdev = to_rpmsg_device(dev);
1329 struct glink_channel *channel = to_glink_channel(rpdev->ept);
1330
1331 channel->rpdev = NULL;
1332 kfree(rpdev);
1333 }
1334
1335 static int qcom_glink_rx_open(struct qcom_glink *glink, unsigned int rcid,
1336 char *name)
1337 {
1338 struct glink_channel *channel;
1339 struct rpmsg_device *rpdev;
1340 bool create_device = false;
1341 struct device_node *node;
1342 int lcid;
1343 int ret;
1344 unsigned long flags;
1345
1346 spin_lock_irqsave(&glink->idr_lock, flags);
1347 idr_for_each_entry(&glink->lcids, channel, lcid) {
1348 if (!strcmp(channel->name, name))
1349 break;
1350 }
1351 spin_unlock_irqrestore(&glink->idr_lock, flags);
1352
1353 if (!channel) {
1354 channel = qcom_glink_alloc_channel(glink, name);
1355 if (IS_ERR(channel))
1356 return PTR_ERR(channel);
1357
1358 /* The opening dance was initiated by the remote */
1359 create_device = true;
1360 }
1361
1362 spin_lock_irqsave(&glink->idr_lock, flags);
1363 ret = idr_alloc(&glink->rcids, channel, rcid, rcid + 1, GFP_ATOMIC);
1364 if (ret < 0) {
1365 dev_err(glink->dev, "Unable to insert channel into rcid list\n");
1366 spin_unlock_irqrestore(&glink->idr_lock, flags);
1367 goto free_channel;
1368 }
1369 channel->rcid = ret;
1370 spin_unlock_irqrestore(&glink->idr_lock, flags);
1371
1372 complete(&channel->open_req);
1373
1374 if (create_device) {
1375 rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL);
1376 if (!rpdev) {
1377 ret = -ENOMEM;
1378 goto rcid_remove;
1379 }
1380
1381 rpdev->ept = &channel->ept;
1382 strncpy(rpdev->id.name, name, RPMSG_NAME_SIZE);
1383 rpdev->src = RPMSG_ADDR_ANY;
1384 rpdev->dst = RPMSG_ADDR_ANY;
1385 rpdev->ops = &glink_device_ops;
1386
1387 node = qcom_glink_match_channel(glink->dev->of_node, name);
1388 rpdev->dev.of_node = node;
1389 rpdev->dev.parent = glink->dev;
1390 rpdev->dev.release = qcom_glink_rpdev_release;
1391
1392 ret = rpmsg_register_device(rpdev);
1393 if (ret)
1394 goto free_rpdev;
1395
1396 channel->rpdev = rpdev;
1397 }
1398
1399 return 0;
1400
1401 free_rpdev:
1402 kfree(rpdev);
1403 rcid_remove:
1404 spin_lock_irqsave(&glink->idr_lock, flags);
1405 idr_remove(&glink->rcids, channel->rcid);
1406 channel->rcid = 0;
1407 spin_unlock_irqrestore(&glink->idr_lock, flags);
1408 free_channel:
1409 /* Release the reference, iff we took it */
1410 if (create_device)
1411 kref_put(&channel->refcount, qcom_glink_channel_release);
1412
1413 return ret;
1414 }
1415
1416 static void qcom_glink_rx_close(struct qcom_glink *glink, unsigned int rcid)
1417 {
1418 struct rpmsg_channel_info chinfo;
1419 struct glink_channel *channel;
1420 unsigned long flags;
1421
1422 spin_lock_irqsave(&glink->idr_lock, flags);
1423 channel = idr_find(&glink->rcids, rcid);
1424 spin_unlock_irqrestore(&glink->idr_lock, flags);
1425 if (WARN(!channel, "close request on unknown channel\n"))
1426 return;
1427
1428 /* cancel pending rx_done work */
1429 cancel_work_sync(&channel->intent_work);
1430
1431 if (channel->rpdev) {
1432 strncpy(chinfo.name, channel->name, sizeof(chinfo.name));
1433 chinfo.src = RPMSG_ADDR_ANY;
1434 chinfo.dst = RPMSG_ADDR_ANY;
1435
1436 rpmsg_unregister_device(glink->dev, &chinfo);
1437 }
1438
1439 qcom_glink_send_close_ack(glink, channel->rcid);
1440
1441 spin_lock_irqsave(&glink->idr_lock, flags);
1442 idr_remove(&glink->rcids, channel->rcid);
1443 channel->rcid = 0;
1444 spin_unlock_irqrestore(&glink->idr_lock, flags);
1445
1446 kref_put(&channel->refcount, qcom_glink_channel_release);
1447 }
1448
1449 static void qcom_glink_rx_close_ack(struct qcom_glink *glink, unsigned int lcid)
1450 {
1451 struct glink_channel *channel;
1452 unsigned long flags;
1453
1454 spin_lock_irqsave(&glink->idr_lock, flags);
1455 channel = idr_find(&glink->lcids, lcid);
1456 if (WARN(!channel, "close ack on unknown channel\n")) {
1457 spin_unlock_irqrestore(&glink->idr_lock, flags);
1458 return;
1459 }
1460
1461 idr_remove(&glink->lcids, channel->lcid);
1462 channel->lcid = 0;
1463 spin_unlock_irqrestore(&glink->idr_lock, flags);
1464
1465 kref_put(&channel->refcount, qcom_glink_channel_release);
1466 }
1467
1468 static void qcom_glink_work(struct work_struct *work)
1469 {
1470 struct qcom_glink *glink = container_of(work, struct qcom_glink,
1471 rx_work);
1472 struct glink_defer_cmd *dcmd;
1473 struct glink_msg *msg;
1474 unsigned long flags;
1475 unsigned int param1;
1476 unsigned int param2;
1477 unsigned int cmd;
1478
1479 for (;;) {
1480 spin_lock_irqsave(&glink->rx_lock, flags);
1481 if (list_empty(&glink->rx_queue)) {
1482 spin_unlock_irqrestore(&glink->rx_lock, flags);
1483 break;
1484 }
1485 dcmd = list_first_entry(&glink->rx_queue,
1486 struct glink_defer_cmd, node);
1487 list_del(&dcmd->node);
1488 spin_unlock_irqrestore(&glink->rx_lock, flags);
1489
1490 msg = &dcmd->msg;
1491 cmd = le16_to_cpu(msg->cmd);
1492 param1 = le16_to_cpu(msg->param1);
1493 param2 = le32_to_cpu(msg->param2);
1494
1495 switch (cmd) {
1496 case RPM_CMD_VERSION:
1497 qcom_glink_receive_version(glink, param1, param2);
1498 break;
1499 case RPM_CMD_VERSION_ACK:
1500 qcom_glink_receive_version_ack(glink, param1, param2);
1501 break;
1502 case RPM_CMD_OPEN:
1503 qcom_glink_rx_open(glink, param1, msg->data);
1504 break;
1505 case RPM_CMD_CLOSE:
1506 qcom_glink_rx_close(glink, param1);
1507 break;
1508 case RPM_CMD_CLOSE_ACK:
1509 qcom_glink_rx_close_ack(glink, param1);
1510 break;
1511 case RPM_CMD_RX_INTENT_REQ:
1512 qcom_glink_handle_intent_req(glink, param1, param2);
1513 break;
1514 default:
1515 WARN(1, "Unknown defer object %d\n", cmd);
1516 break;
1517 }
1518
1519 kfree(dcmd);
1520 }
1521 }
1522
1523 struct qcom_glink *qcom_glink_native_probe(struct device *dev,
1524 unsigned long features,
1525 struct qcom_glink_pipe *rx,
1526 struct qcom_glink_pipe *tx,
1527 bool intentless)
1528 {
1529 int irq;
1530 int ret;
1531 struct qcom_glink *glink;
1532
1533 glink = devm_kzalloc(dev, sizeof(*glink), GFP_KERNEL);
1534 if (!glink)
1535 return ERR_PTR(-ENOMEM);
1536
1537 glink->dev = dev;
1538 glink->tx_pipe = tx;
1539 glink->rx_pipe = rx;
1540
1541 glink->features = features;
1542 glink->intentless = intentless;
1543
1544 mutex_init(&glink->tx_lock);
1545 spin_lock_init(&glink->rx_lock);
1546 INIT_LIST_HEAD(&glink->rx_queue);
1547 INIT_WORK(&glink->rx_work, qcom_glink_work);
1548
1549 spin_lock_init(&glink->idr_lock);
1550 idr_init(&glink->lcids);
1551 idr_init(&glink->rcids);
1552
1553 glink->mbox_client.dev = dev;
1554 glink->mbox_chan = mbox_request_channel(&glink->mbox_client, 0);
1555 if (IS_ERR(glink->mbox_chan)) {
1556 if (PTR_ERR(glink->mbox_chan) != -EPROBE_DEFER)
1557 dev_err(dev, "failed to acquire IPC channel\n");
1558 return ERR_CAST(glink->mbox_chan);
1559 }
1560
1561 irq = of_irq_get(dev->of_node, 0);
1562 ret = devm_request_irq(dev, irq,
1563 qcom_glink_native_intr,
1564 IRQF_NO_SUSPEND | IRQF_SHARED,
1565 "glink-native", glink);
1566 if (ret) {
1567 dev_err(dev, "failed to request IRQ\n");
1568 return ERR_PTR(ret);
1569 }
1570
1571 glink->irq = irq;
1572
1573 ret = qcom_glink_send_version(glink);
1574 if (ret)
1575 return ERR_PTR(ret);
1576
1577 return glink;
1578 }
1579 EXPORT_SYMBOL_GPL(qcom_glink_native_probe);
1580
1581 static int qcom_glink_remove_device(struct device *dev, void *data)
1582 {
1583 device_unregister(dev);
1584
1585 return 0;
1586 }
1587
1588 void qcom_glink_native_remove(struct qcom_glink *glink)
1589 {
1590 struct glink_channel *channel;
1591 int cid;
1592 int ret;
1593 unsigned long flags;
1594
1595 disable_irq(glink->irq);
1596 cancel_work_sync(&glink->rx_work);
1597
1598 ret = device_for_each_child(glink->dev, NULL, qcom_glink_remove_device);
1599 if (ret)
1600 dev_warn(glink->dev, "Can't remove GLINK devices: %d\n", ret);
1601
1602 spin_lock_irqsave(&glink->idr_lock, flags);
1603 /* Release any defunct local channels, waiting for close-ack */
1604 idr_for_each_entry(&glink->lcids, channel, cid)
1605 kref_put(&channel->refcount, qcom_glink_channel_release);
1606
1607 idr_destroy(&glink->lcids);
1608 idr_destroy(&glink->rcids);
1609 spin_unlock_irqrestore(&glink->idr_lock, flags);
1610 mbox_free_channel(glink->mbox_chan);
1611 }
1612 EXPORT_SYMBOL_GPL(qcom_glink_native_remove);
1613
1614 void qcom_glink_native_unregister(struct qcom_glink *glink)
1615 {
1616 device_unregister(glink->dev);
1617 }
1618 EXPORT_SYMBOL_GPL(qcom_glink_native_unregister);
Linux with added FPC-III support