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watchdog/core: Rename some softlockup_* functions
[linux/fpc-iii.git] / drivers / rpmsg / qcom_glink_native.c
blob5a5e927ea50f45ac307dc6ed0abfa4f8d4b3a815
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
639 if (!intent)
640 return NULL;
641
642 intent->data = kzalloc(size, GFP_KERNEL);
643 if (!intent->data)
644 return NULL;
645
646 spin_lock_irqsave(&channel->intent_lock, flags);
647 ret = idr_alloc_cyclic(&channel->liids, intent, 1, -1, GFP_ATOMIC);
648 if (ret < 0) {
649 spin_unlock_irqrestore(&channel->intent_lock, flags);
650 return NULL;
651 }
652 spin_unlock_irqrestore(&channel->intent_lock, flags);
653
654 intent->id = ret;
655 intent->size = size;
656 intent->reuse = reuseable;
657
658 return intent;
659 }
660
661 static void qcom_glink_handle_rx_done(struct qcom_glink *glink,
662 u32 cid, uint32_t iid,
663 bool reuse)
664 {
665 struct glink_core_rx_intent *intent;
666 struct glink_channel *channel;
667 unsigned long flags;
668
669 spin_lock_irqsave(&glink->idr_lock, flags);
670 channel = idr_find(&glink->rcids, cid);
671 spin_unlock_irqrestore(&glink->idr_lock, flags);
672 if (!channel) {
673 dev_err(glink->dev, "invalid channel id received\n");
674 return;
675 }
676
677 spin_lock_irqsave(&channel->intent_lock, flags);
678 intent = idr_find(&channel->riids, iid);
679
680 if (!intent) {
681 spin_unlock_irqrestore(&channel->intent_lock, flags);
682 dev_err(glink->dev, "invalid intent id received\n");
683 return;
684 }
685
686 intent->in_use = false;
687
688 if (!reuse) {
689 idr_remove(&channel->riids, intent->id);
690 kfree(intent);
691 }
692 spin_unlock_irqrestore(&channel->intent_lock, flags);
693 }
694
695 /**
696 * qcom_glink_handle_intent_req() - Receive a request for rx_intent
697 * from remote side
698 * if_ptr: Pointer to the transport interface
699 * rcid: Remote channel ID
700 * size: size of the intent
701 *
702 * The function searches for the local channel to which the request for
703 * rx_intent has arrived and allocates and notifies the remote back
704 */
705 static void qcom_glink_handle_intent_req(struct qcom_glink *glink,
706 u32 cid, size_t size)
707 {
708 struct glink_core_rx_intent *intent;
709 struct glink_channel *channel;
710 unsigned long flags;
711
712 spin_lock_irqsave(&glink->idr_lock, flags);
713 channel = idr_find(&glink->rcids, cid);
714 spin_unlock_irqrestore(&glink->idr_lock, flags);
715
716 if (!channel) {
717 pr_err("%s channel not found for cid %d\n", __func__, cid);
718 return;
719 }
720
721 intent = qcom_glink_alloc_intent(glink, channel, size, false);
722 if (intent)
723 qcom_glink_advertise_intent(glink, channel, intent);
724
725 qcom_glink_send_intent_req_ack(glink, channel, !!intent);
726 }
727
728 static int qcom_glink_rx_defer(struct qcom_glink *glink, size_t extra)
729 {
730 struct glink_defer_cmd *dcmd;
731
732 extra = ALIGN(extra, 8);
733
734 if (qcom_glink_rx_avail(glink) < sizeof(struct glink_msg) + extra) {
735 dev_dbg(glink->dev, "Insufficient data in rx fifo");
736 return -ENXIO;
737 }
738
739 dcmd = kzalloc(sizeof(*dcmd) + extra, GFP_ATOMIC);
740 if (!dcmd)
741 return -ENOMEM;
742
743 INIT_LIST_HEAD(&dcmd->node);
744
745 qcom_glink_rx_peak(glink, &dcmd->msg, 0, sizeof(dcmd->msg) + extra);
746
747 spin_lock(&glink->rx_lock);
748 list_add_tail(&dcmd->node, &glink->rx_queue);
749 spin_unlock(&glink->rx_lock);
750
751 schedule_work(&glink->rx_work);
752 qcom_glink_rx_advance(glink, sizeof(dcmd->msg) + extra);
753
754 return 0;
755 }
756
757 static int qcom_glink_rx_data(struct qcom_glink *glink, size_t avail)
758 {
759 struct glink_core_rx_intent *intent;
760 struct glink_channel *channel;
761 struct {
762 struct glink_msg msg;
763 __le32 chunk_size;
764 __le32 left_size;
765 } __packed hdr;
766 unsigned int chunk_size;
767 unsigned int left_size;
768 unsigned int rcid;
769 unsigned int liid;
770 int ret = 0;
771 unsigned long flags;
772
773 if (avail < sizeof(hdr)) {
774 dev_dbg(glink->dev, "Not enough data in fifo\n");
775 return -EAGAIN;
776 }
777
778 qcom_glink_rx_peak(glink, &hdr, 0, sizeof(hdr));
779 chunk_size = le32_to_cpu(hdr.chunk_size);
780 left_size = le32_to_cpu(hdr.left_size);
781
782 if (avail < sizeof(hdr) + chunk_size) {
783 dev_dbg(glink->dev, "Payload not yet in fifo\n");
784 return -EAGAIN;
785 }
786
787 if (WARN(chunk_size % 4, "Incoming data must be word aligned\n"))
788 return -EINVAL;
789
790 rcid = le16_to_cpu(hdr.msg.param1);
791 spin_lock_irqsave(&glink->idr_lock, flags);
792 channel = idr_find(&glink->rcids, rcid);
793 spin_unlock_irqrestore(&glink->idr_lock, flags);
794 if (!channel) {
795 dev_dbg(glink->dev, "Data on non-existing channel\n");
796
797 /* Drop the message */
798 goto advance_rx;
799 }
800
801 if (glink->intentless) {
802 /* Might have an ongoing, fragmented, message to append */
803 if (!channel->buf) {
804 intent = kzalloc(sizeof(*intent), GFP_ATOMIC);
805 if (!intent)
806 return -ENOMEM;
807
808 intent->data = kmalloc(chunk_size + left_size,
809 GFP_ATOMIC);
810 if (!intent->data) {
811 kfree(intent);
812 return -ENOMEM;
813 }
814
815 intent->id = 0xbabababa;
816 intent->size = chunk_size + left_size;
817 intent->offset = 0;
818
819 channel->buf = intent;
820 } else {
821 intent = channel->buf;
822 }
823 } else {
824 liid = le32_to_cpu(hdr.msg.param2);
825
826 spin_lock_irqsave(&channel->intent_lock, flags);
827 intent = idr_find(&channel->liids, liid);
828 spin_unlock_irqrestore(&channel->intent_lock, flags);
829
830 if (!intent) {
831 dev_err(glink->dev,
832 "no intent found for channel %s intent %d",
833 channel->name, liid);
834 goto advance_rx;
835 }
836 }
837
838 if (intent->size - intent->offset < chunk_size) {
839 dev_err(glink->dev, "Insufficient space in intent\n");
840
841 /* The packet header lied, drop payload */
842 goto advance_rx;
843 }
844
845 qcom_glink_rx_peak(glink, intent->data + intent->offset,
846 sizeof(hdr), chunk_size);
847 intent->offset += chunk_size;
848
849 /* Handle message when no fragments remain to be received */
850 if (!left_size) {
851 spin_lock(&channel->recv_lock);
852 if (channel->ept.cb) {
853 channel->ept.cb(channel->ept.rpdev,
854 intent->data,
855 intent->offset,
856 channel->ept.priv,
857 RPMSG_ADDR_ANY);
858 }
859 spin_unlock(&channel->recv_lock);
860
861 intent->offset = 0;
862 channel->buf = NULL;
863
864 qcom_glink_rx_done(glink, channel, intent);
865 }
866
867 advance_rx:
868 qcom_glink_rx_advance(glink, ALIGN(sizeof(hdr) + chunk_size, 8));
869
870 return ret;
871 }
872
873 static void qcom_glink_handle_intent(struct qcom_glink *glink,
874 unsigned int cid,
875 unsigned int count,
876 size_t avail)
877 {
878 struct glink_core_rx_intent *intent;
879 struct glink_channel *channel;
880 struct intent_pair {
881 __le32 size;
882 __le32 iid;
883 };
884
885 struct {
886 struct glink_msg msg;
887 struct intent_pair intents[];
888 } __packed * msg;
889
890 const size_t msglen = sizeof(*msg) + sizeof(struct intent_pair) * count;
891 int ret;
892 int i;
893 unsigned long flags;
894
895 if (avail < msglen) {
896 dev_dbg(glink->dev, "Not enough data in fifo\n");
897 return;
898 }
899
900 spin_lock_irqsave(&glink->idr_lock, flags);
901 channel = idr_find(&glink->rcids, cid);
902 spin_unlock_irqrestore(&glink->idr_lock, flags);
903 if (!channel) {
904 dev_err(glink->dev, "intents for non-existing channel\n");
905 return;
906 }
907
908 msg = kmalloc(msglen, GFP_ATOMIC);
909 if (!msg)
910 return;
911
912 qcom_glink_rx_peak(glink, msg, 0, msglen);
913
914 for (i = 0; i < count; ++i) {
915 intent = kzalloc(sizeof(*intent), GFP_ATOMIC);
916 if (!intent)
917 break;
918
919 intent->id = le32_to_cpu(msg->intents[i].iid);
920 intent->size = le32_to_cpu(msg->intents[i].size);
921
922 spin_lock_irqsave(&channel->intent_lock, flags);
923 ret = idr_alloc(&channel->riids, intent,
924 intent->id, intent->id + 1, GFP_ATOMIC);
925 spin_unlock_irqrestore(&channel->intent_lock, flags);
926
927 if (ret < 0)
928 dev_err(glink->dev, "failed to store remote intent\n");
929 }
930
931 kfree(msg);
932 qcom_glink_rx_advance(glink, ALIGN(msglen, 8));
933 }
934
935 static int qcom_glink_rx_open_ack(struct qcom_glink *glink, unsigned int lcid)
936 {
937 struct glink_channel *channel;
938
939 spin_lock(&glink->idr_lock);
940 channel = idr_find(&glink->lcids, lcid);
941 spin_unlock(&glink->idr_lock);
942 if (!channel) {
943 dev_err(glink->dev, "Invalid open ack packet\n");
944 return -EINVAL;
945 }
946
947 complete(&channel->open_ack);
948
949 return 0;
950 }
951
952 static irqreturn_t qcom_glink_native_intr(int irq, void *data)
953 {
954 struct qcom_glink *glink = data;
955 struct glink_msg msg;
956 unsigned int param1;
957 unsigned int param2;
958 unsigned int avail;
959 unsigned int cmd;
960 int ret = 0;
961
962 for (;;) {
963 avail = qcom_glink_rx_avail(glink);
964 if (avail < sizeof(msg))
965 break;
966
967 qcom_glink_rx_peak(glink, &msg, 0, sizeof(msg));
968
969 cmd = le16_to_cpu(msg.cmd);
970 param1 = le16_to_cpu(msg.param1);
971 param2 = le32_to_cpu(msg.param2);
972
973 switch (cmd) {
974 case RPM_CMD_VERSION:
975 case RPM_CMD_VERSION_ACK:
976 case RPM_CMD_CLOSE:
977 case RPM_CMD_CLOSE_ACK:
978 case RPM_CMD_RX_INTENT_REQ:
979 ret = qcom_glink_rx_defer(glink, 0);
980 break;
981 case RPM_CMD_OPEN_ACK:
982 ret = qcom_glink_rx_open_ack(glink, param1);
983 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
984 break;
985 case RPM_CMD_OPEN:
986 ret = qcom_glink_rx_defer(glink, param2);
987 break;
988 case RPM_CMD_TX_DATA:
989 case RPM_CMD_TX_DATA_CONT:
990 ret = qcom_glink_rx_data(glink, avail);
991 break;
992 case RPM_CMD_READ_NOTIF:
993 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
994
995 mbox_send_message(glink->mbox_chan, NULL);
996 mbox_client_txdone(glink->mbox_chan, 0);
997 break;
998 case RPM_CMD_INTENT:
999 qcom_glink_handle_intent(glink, param1, param2, avail);
1000 break;
1001 case RPM_CMD_RX_DONE:
1002 qcom_glink_handle_rx_done(glink, param1, param2, false);
1003 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
1004 break;
1005 case RPM_CMD_RX_DONE_W_REUSE:
1006 qcom_glink_handle_rx_done(glink, param1, param2, true);
1007 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
1008 break;
1009 case RPM_CMD_RX_INTENT_REQ_ACK:
1010 qcom_glink_handle_intent_req_ack(glink, param1, param2);
1011 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
1012 break;
1013 default:
1014 dev_err(glink->dev, "unhandled rx cmd: %d\n", cmd);
1015 ret = -EINVAL;
1016 break;
1017 }
1018
1019 if (ret)
1020 break;
1021 }
1022
1023 return IRQ_HANDLED;
1024 }
1025
1026 /* Locally initiated rpmsg_create_ept */
1027 static struct glink_channel *qcom_glink_create_local(struct qcom_glink *glink,
1028 const char *name)
1029 {
1030 struct glink_channel *channel;
1031 int ret;
1032 unsigned long flags;
1033
1034 channel = qcom_glink_alloc_channel(glink, name);
1035 if (IS_ERR(channel))
1036 return ERR_CAST(channel);
1037
1038 ret = qcom_glink_send_open_req(glink, channel);
1039 if (ret)
1040 goto release_channel;
1041
1042 ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ);
1043 if (!ret)
1044 goto err_timeout;
1045
1046 ret = wait_for_completion_timeout(&channel->open_req, 5 * HZ);
1047 if (!ret)
1048 goto err_timeout;
1049
1050 qcom_glink_send_open_ack(glink, channel);
1051
1052 return channel;
1053
1054 err_timeout:
1055 /* qcom_glink_send_open_req() did register the channel in lcids*/
1056 spin_lock_irqsave(&glink->idr_lock, flags);
1057 idr_remove(&glink->lcids, channel->lcid);
1058 spin_unlock_irqrestore(&glink->idr_lock, flags);
1059
1060 release_channel:
1061 /* Release qcom_glink_send_open_req() reference */
1062 kref_put(&channel->refcount, qcom_glink_channel_release);
1063 /* Release qcom_glink_alloc_channel() reference */
1064 kref_put(&channel->refcount, qcom_glink_channel_release);
1065
1066 return ERR_PTR(-ETIMEDOUT);
1067 }
1068
1069 /* Remote initiated rpmsg_create_ept */
1070 static int qcom_glink_create_remote(struct qcom_glink *glink,
1071 struct glink_channel *channel)
1072 {
1073 int ret;
1074
1075 qcom_glink_send_open_ack(glink, channel);
1076
1077 ret = qcom_glink_send_open_req(glink, channel);
1078 if (ret)
1079 goto close_link;
1080
1081 ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ);
1082 if (!ret) {
1083 ret = -ETIMEDOUT;
1084 goto close_link;
1085 }
1086
1087 return 0;
1088
1089 close_link:
1090 /*
1091 * Send a close request to "undo" our open-ack. The close-ack will
1092 * release the last reference.
1093 */
1094 qcom_glink_send_close_req(glink, channel);
1095
1096 /* Release qcom_glink_send_open_req() reference */
1097 kref_put(&channel->refcount, qcom_glink_channel_release);
1098
1099 return ret;
1100 }
1101
1102 static struct rpmsg_endpoint *qcom_glink_create_ept(struct rpmsg_device *rpdev,
1103 rpmsg_rx_cb_t cb,
1104 void *priv,
1105 struct rpmsg_channel_info
1106 chinfo)
1107 {
1108 struct glink_channel *parent = to_glink_channel(rpdev->ept);
1109 struct glink_channel *channel;
1110 struct qcom_glink *glink = parent->glink;
1111 struct rpmsg_endpoint *ept;
1112 const char *name = chinfo.name;
1113 int cid;
1114 int ret;
1115 unsigned long flags;
1116
1117 spin_lock_irqsave(&glink->idr_lock, flags);
1118 idr_for_each_entry(&glink->rcids, channel, cid) {
1119 if (!strcmp(channel->name, name))
1120 break;
1121 }
1122 spin_unlock_irqrestore(&glink->idr_lock, flags);
1123
1124 if (!channel) {
1125 channel = qcom_glink_create_local(glink, name);
1126 if (IS_ERR(channel))
1127 return NULL;
1128 } else {
1129 ret = qcom_glink_create_remote(glink, channel);
1130 if (ret)
1131 return NULL;
1132 }
1133
1134 ept = &channel->ept;
1135 ept->rpdev = rpdev;
1136 ept->cb = cb;
1137 ept->priv = priv;
1138 ept->ops = &glink_endpoint_ops;
1139
1140 return ept;
1141 }
1142
1143 static int qcom_glink_announce_create(struct rpmsg_device *rpdev)
1144 {
1145 struct glink_channel *channel = to_glink_channel(rpdev->ept);
1146 struct glink_core_rx_intent *intent;
1147 struct qcom_glink *glink = channel->glink;
1148 int num_intents = glink->intentless ? 0 : 5;
1149
1150 /* Channel is now open, advertise base set of intents */
1151 while (num_intents--) {
1152 intent = qcom_glink_alloc_intent(glink, channel, SZ_1K, true);
1153 if (!intent)
1154 break;
1155
1156 qcom_glink_advertise_intent(glink, channel, intent);
1157 }
1158
1159 return 0;
1160 }
1161
1162 static void qcom_glink_destroy_ept(struct rpmsg_endpoint *ept)
1163 {
1164 struct glink_channel *channel = to_glink_channel(ept);
1165 struct qcom_glink *glink = channel->glink;
1166 unsigned long flags;
1167
1168 spin_lock_irqsave(&channel->recv_lock, flags);
1169 channel->ept.cb = NULL;
1170 spin_unlock_irqrestore(&channel->recv_lock, flags);
1171
1172 /* Decouple the potential rpdev from the channel */
1173 channel->rpdev = NULL;
1174
1175 qcom_glink_send_close_req(glink, channel);
1176 }
1177
1178 static int qcom_glink_request_intent(struct qcom_glink *glink,
1179 struct glink_channel *channel,
1180 size_t size)
1181 {
1182 struct {
1183 u16 id;
1184 u16 cid;
1185 u32 size;
1186 } __packed cmd;
1187
1188 int ret;
1189
1190 mutex_lock(&channel->intent_req_lock);
1191
1192 reinit_completion(&channel->intent_req_comp);
1193
1194 cmd.id = RPM_CMD_RX_INTENT_REQ;
1195 cmd.cid = channel->lcid;
1196 cmd.size = size;
1197
1198 ret = qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true);
1199 if (ret)
1200 return ret;
1201
1202 ret = wait_for_completion_timeout(&channel->intent_req_comp, 10 * HZ);
1203 if (!ret) {
1204 dev_err(glink->dev, "intent request timed out\n");
1205 ret = -ETIMEDOUT;
1206 } else {
1207 ret = channel->intent_req_result ? 0 : -ECANCELED;
1208 }
1209
1210 mutex_unlock(&channel->intent_req_lock);
1211 return ret;
1212 }
1213
1214 static int __qcom_glink_send(struct glink_channel *channel,
1215 void *data, int len, bool wait)
1216 {
1217 struct qcom_glink *glink = channel->glink;
1218 struct glink_core_rx_intent *intent = NULL;
1219 struct glink_core_rx_intent *tmp;
1220 int iid = 0;
1221 struct {
1222 struct glink_msg msg;
1223 __le32 chunk_size;
1224 __le32 left_size;
1225 } __packed req;
1226 int ret;
1227 unsigned long flags;
1228
1229 if (!glink->intentless) {
1230 while (!intent) {
1231 spin_lock_irqsave(&channel->intent_lock, flags);
1232 idr_for_each_entry(&channel->riids, tmp, iid) {
1233 if (tmp->size >= len && !tmp->in_use) {
1234 tmp->in_use = true;
1235 intent = tmp;
1236 break;
1237 }
1238 }
1239 spin_unlock_irqrestore(&channel->intent_lock, flags);
1240
1241 /* We found an available intent */
1242 if (intent)
1243 break;
1244
1245 if (!wait)
1246 return -EBUSY;
1247
1248 ret = qcom_glink_request_intent(glink, channel, len);
1249 if (ret < 0)
1250 return ret;
1251 }
1252
1253 iid = intent->id;
1254 }
1255
1256 req.msg.cmd = cpu_to_le16(RPM_CMD_TX_DATA);
1257 req.msg.param1 = cpu_to_le16(channel->lcid);
1258 req.msg.param2 = cpu_to_le32(iid);
1259 req.chunk_size = cpu_to_le32(len);
1260 req.left_size = cpu_to_le32(0);
1261
1262 ret = qcom_glink_tx(glink, &req, sizeof(req), data, len, wait);
1263
1264 /* Mark intent available if we failed */
1265 if (ret && intent)
1266 intent->in_use = false;
1267
1268 return ret;
1269 }
1270
1271 static int qcom_glink_send(struct rpmsg_endpoint *ept, void *data, int len)
1272 {
1273 struct glink_channel *channel = to_glink_channel(ept);
1274
1275 return __qcom_glink_send(channel, data, len, true);
1276 }
1277
1278 static int qcom_glink_trysend(struct rpmsg_endpoint *ept, void *data, int len)
1279 {
1280 struct glink_channel *channel = to_glink_channel(ept);
1281
1282 return __qcom_glink_send(channel, data, len, false);
1283 }
1284
1285 /*
1286 * Finds the device_node for the glink child interested in this channel.
1287 */
1288 static struct device_node *qcom_glink_match_channel(struct device_node *node,
1289 const char *channel)
1290 {
1291 struct device_node *child;
1292 const char *name;
1293 const char *key;
1294 int ret;
1295
1296 for_each_available_child_of_node(node, child) {
1297 key = "qcom,glink-channels";
1298 ret = of_property_read_string(child, key, &name);
1299 if (ret)
1300 continue;
1301
1302 if (strcmp(name, channel) == 0)
1303 return child;
1304 }
1305
1306 return NULL;
1307 }
1308
1309 static const struct rpmsg_device_ops glink_device_ops = {
1310 .create_ept = qcom_glink_create_ept,
1311 .announce_create = qcom_glink_announce_create,
1312 };
1313
1314 static const struct rpmsg_endpoint_ops glink_endpoint_ops = {
1315 .destroy_ept = qcom_glink_destroy_ept,
1316 .send = qcom_glink_send,
1317 .trysend = qcom_glink_trysend,
1318 };
1319
1320 static void qcom_glink_rpdev_release(struct device *dev)
1321 {
1322 struct rpmsg_device *rpdev = to_rpmsg_device(dev);
1323 struct glink_channel *channel = to_glink_channel(rpdev->ept);
1324
1325 channel->rpdev = NULL;
1326 kfree(rpdev);
1327 }
1328
1329 static int qcom_glink_rx_open(struct qcom_glink *glink, unsigned int rcid,
1330 char *name)
1331 {
1332 struct glink_channel *channel;
1333 struct rpmsg_device *rpdev;
1334 bool create_device = false;
1335 struct device_node *node;
1336 int lcid;
1337 int ret;
1338 unsigned long flags;
1339
1340 spin_lock_irqsave(&glink->idr_lock, flags);
1341 idr_for_each_entry(&glink->lcids, channel, lcid) {
1342 if (!strcmp(channel->name, name))
1343 break;
1344 }
1345 spin_unlock_irqrestore(&glink->idr_lock, flags);
1346
1347 if (!channel) {
1348 channel = qcom_glink_alloc_channel(glink, name);
1349 if (IS_ERR(channel))
1350 return PTR_ERR(channel);
1351
1352 /* The opening dance was initiated by the remote */
1353 create_device = true;
1354 }
1355
1356 spin_lock_irqsave(&glink->idr_lock, flags);
1357 ret = idr_alloc(&glink->rcids, channel, rcid, rcid + 1, GFP_ATOMIC);
1358 if (ret < 0) {
1359 dev_err(glink->dev, "Unable to insert channel into rcid list\n");
1360 spin_unlock_irqrestore(&glink->idr_lock, flags);
1361 goto free_channel;
1362 }
1363 channel->rcid = ret;
1364 spin_unlock_irqrestore(&glink->idr_lock, flags);
1365
1366 complete(&channel->open_req);
1367
1368 if (create_device) {
1369 rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL);
1370 if (!rpdev) {
1371 ret = -ENOMEM;
1372 goto rcid_remove;
1373 }
1374
1375 rpdev->ept = &channel->ept;
1376 strncpy(rpdev->id.name, name, RPMSG_NAME_SIZE);
1377 rpdev->src = RPMSG_ADDR_ANY;
1378 rpdev->dst = RPMSG_ADDR_ANY;
1379 rpdev->ops = &glink_device_ops;
1380
1381 node = qcom_glink_match_channel(glink->dev->of_node, name);
1382 rpdev->dev.of_node = node;
1383 rpdev->dev.parent = glink->dev;
1384 rpdev->dev.release = qcom_glink_rpdev_release;
1385
1386 ret = rpmsg_register_device(rpdev);
1387 if (ret)
1388 goto free_rpdev;
1389
1390 channel->rpdev = rpdev;
1391 }
1392
1393 return 0;
1394
1395 free_rpdev:
1396 kfree(rpdev);
1397 rcid_remove:
1398 spin_lock_irqsave(&glink->idr_lock, flags);
1399 idr_remove(&glink->rcids, channel->rcid);
1400 channel->rcid = 0;
1401 spin_unlock_irqrestore(&glink->idr_lock, flags);
1402 free_channel:
1403 /* Release the reference, iff we took it */
1404 if (create_device)
1405 kref_put(&channel->refcount, qcom_glink_channel_release);
1406
1407 return ret;
1408 }
1409
1410 static void qcom_glink_rx_close(struct qcom_glink *glink, unsigned int rcid)
1411 {
1412 struct rpmsg_channel_info chinfo;
1413 struct glink_channel *channel;
1414 unsigned long flags;
1415
1416 spin_lock_irqsave(&glink->idr_lock, flags);
1417 channel = idr_find(&glink->rcids, rcid);
1418 spin_unlock_irqrestore(&glink->idr_lock, flags);
1419 if (WARN(!channel, "close request on unknown channel\n"))
1420 return;
1421
1422 /* cancel pending rx_done work */
1423 cancel_work_sync(&channel->intent_work);
1424
1425 if (channel->rpdev) {
1426 strncpy(chinfo.name, channel->name, sizeof(chinfo.name));
1427 chinfo.src = RPMSG_ADDR_ANY;
1428 chinfo.dst = RPMSG_ADDR_ANY;
1429
1430 rpmsg_unregister_device(glink->dev, &chinfo);
1431 }
1432
1433 qcom_glink_send_close_ack(glink, channel->rcid);
1434
1435 spin_lock_irqsave(&glink->idr_lock, flags);
1436 idr_remove(&glink->rcids, channel->rcid);
1437 channel->rcid = 0;
1438 spin_unlock_irqrestore(&glink->idr_lock, flags);
1439
1440 kref_put(&channel->refcount, qcom_glink_channel_release);
1441 }
1442
1443 static void qcom_glink_rx_close_ack(struct qcom_glink *glink, unsigned int lcid)
1444 {
1445 struct glink_channel *channel;
1446 unsigned long flags;
1447
1448 spin_lock_irqsave(&glink->idr_lock, flags);
1449 channel = idr_find(&glink->lcids, lcid);
1450 if (WARN(!channel, "close ack on unknown channel\n")) {
1451 spin_unlock_irqrestore(&glink->idr_lock, flags);
1452 return;
1453 }
1454
1455 idr_remove(&glink->lcids, channel->lcid);
1456 channel->lcid = 0;
1457 spin_unlock_irqrestore(&glink->idr_lock, flags);
1458
1459 kref_put(&channel->refcount, qcom_glink_channel_release);
1460 }
1461
1462 static void qcom_glink_work(struct work_struct *work)
1463 {
1464 struct qcom_glink *glink = container_of(work, struct qcom_glink,
1465 rx_work);
1466 struct glink_defer_cmd *dcmd;
1467 struct glink_msg *msg;
1468 unsigned long flags;
1469 unsigned int param1;
1470 unsigned int param2;
1471 unsigned int cmd;
1472
1473 for (;;) {
1474 spin_lock_irqsave(&glink->rx_lock, flags);
1475 if (list_empty(&glink->rx_queue)) {
1476 spin_unlock_irqrestore(&glink->rx_lock, flags);
1477 break;
1478 }
1479 dcmd = list_first_entry(&glink->rx_queue,
1480 struct glink_defer_cmd, node);
1481 list_del(&dcmd->node);
1482 spin_unlock_irqrestore(&glink->rx_lock, flags);
1483
1484 msg = &dcmd->msg;
1485 cmd = le16_to_cpu(msg->cmd);
1486 param1 = le16_to_cpu(msg->param1);
1487 param2 = le32_to_cpu(msg->param2);
1488
1489 switch (cmd) {
1490 case RPM_CMD_VERSION:
1491 qcom_glink_receive_version(glink, param1, param2);
1492 break;
1493 case RPM_CMD_VERSION_ACK:
1494 qcom_glink_receive_version_ack(glink, param1, param2);
1495 break;
1496 case RPM_CMD_OPEN:
1497 qcom_glink_rx_open(glink, param1, msg->data);
1498 break;
1499 case RPM_CMD_CLOSE:
1500 qcom_glink_rx_close(glink, param1);
1501 break;
1502 case RPM_CMD_CLOSE_ACK:
1503 qcom_glink_rx_close_ack(glink, param1);
1504 break;
1505 case RPM_CMD_RX_INTENT_REQ:
1506 qcom_glink_handle_intent_req(glink, param1, param2);
1507 break;
1508 default:
1509 WARN(1, "Unknown defer object %d\n", cmd);
1510 break;
1511 }
1512
1513 kfree(dcmd);
1514 }
1515 }
1516
1517 struct qcom_glink *qcom_glink_native_probe(struct device *dev,
1518 unsigned long features,
1519 struct qcom_glink_pipe *rx,
1520 struct qcom_glink_pipe *tx,
1521 bool intentless)
1522 {
1523 int irq;
1524 int ret;
1525 struct qcom_glink *glink;
1526
1527 glink = devm_kzalloc(dev, sizeof(*glink), GFP_KERNEL);
1528 if (!glink)
1529 return ERR_PTR(-ENOMEM);
1530
1531 glink->dev = dev;
1532 glink->tx_pipe = tx;
1533 glink->rx_pipe = rx;
1534
1535 glink->features = features;
1536 glink->intentless = intentless;
1537
1538 mutex_init(&glink->tx_lock);
1539 spin_lock_init(&glink->rx_lock);
1540 INIT_LIST_HEAD(&glink->rx_queue);
1541 INIT_WORK(&glink->rx_work, qcom_glink_work);
1542
1543 spin_lock_init(&glink->idr_lock);
1544 idr_init(&glink->lcids);
1545 idr_init(&glink->rcids);
1546
1547 glink->mbox_client.dev = dev;
1548 glink->mbox_chan = mbox_request_channel(&glink->mbox_client, 0);
1549 if (IS_ERR(glink->mbox_chan)) {
1550 if (PTR_ERR(glink->mbox_chan) != -EPROBE_DEFER)
1551 dev_err(dev, "failed to acquire IPC channel\n");
1552 return ERR_CAST(glink->mbox_chan);
1553 }
1554
1555 irq = of_irq_get(dev->of_node, 0);
1556 ret = devm_request_irq(dev, irq,
1557 qcom_glink_native_intr,
1558 IRQF_NO_SUSPEND | IRQF_SHARED,
1559 "glink-native", glink);
1560 if (ret) {
1561 dev_err(dev, "failed to request IRQ\n");
1562 return ERR_PTR(ret);
1563 }
1564
1565 glink->irq = irq;
1566
1567 ret = qcom_glink_send_version(glink);
1568 if (ret)
1569 return ERR_PTR(ret);
1570
1571 return glink;
1572 }
1573 EXPORT_SYMBOL_GPL(qcom_glink_native_probe);
1574
1575 static int qcom_glink_remove_device(struct device *dev, void *data)
1576 {
1577 device_unregister(dev);
1578
1579 return 0;
1580 }
1581
1582 void qcom_glink_native_remove(struct qcom_glink *glink)
1583 {
1584 struct glink_channel *channel;
1585 int cid;
1586 int ret;
1587 unsigned long flags;
1588
1589 disable_irq(glink->irq);
1590 cancel_work_sync(&glink->rx_work);
1591
1592 ret = device_for_each_child(glink->dev, NULL, qcom_glink_remove_device);
1593 if (ret)
1594 dev_warn(glink->dev, "Can't remove GLINK devices: %d\n", ret);
1595
1596 spin_lock_irqsave(&glink->idr_lock, flags);
1597 /* Release any defunct local channels, waiting for close-ack */
1598 idr_for_each_entry(&glink->lcids, channel, cid)
1599 kref_put(&channel->refcount, qcom_glink_channel_release);
1600
1601 idr_destroy(&glink->lcids);
1602 idr_destroy(&glink->rcids);
1603 spin_unlock_irqrestore(&glink->idr_lock, flags);
1604 mbox_free_channel(glink->mbox_chan);
1605 }
1606 EXPORT_SYMBOL_GPL(qcom_glink_native_remove);
1607
1608 void qcom_glink_native_unregister(struct qcom_glink *glink)
1609 {
1610 device_unregister(glink->dev);
1611 }
1612 EXPORT_SYMBOL_GPL(qcom_glink_native_unregister);
Linux with added FPC-III support