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835764dd BA |
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> | |
6bf68cbd | 26 | #include <linux/sizes.h> |
835764dd BA |
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 | |
d31ad615 | 35 | #define GLINK_VERSION_1 1 |
835764dd BA |
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 | ||
933b45da S |
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; | |
1d2ea36e S |
81 | |
82 | struct list_head node; | |
933b45da S |
83 | }; |
84 | ||
835764dd BA |
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 | ||
44f6df92 | 118 | spinlock_t idr_lock; |
835764dd BA |
119 | struct idr lcids; |
120 | struct idr rcids; | |
d31ad615 S |
121 | unsigned long features; |
122 | ||
123 | bool intentless; | |
835764dd BA |
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 | |
dacbb35e | 143 | * @intent_lock: lock for protection of @liids, @riids |
933b45da | 144 | * @liids: idr of all local intents |
dacbb35e | 145 | * @riids: idr of all remote intents |
1d2ea36e S |
146 | * @intent_work: worker responsible for transmitting rx_done packets |
147 | * @done_intents: list of intents that needs to be announced rx_done | |
835764dd BA |
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 | |
27b9c5b6 S |
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 | |
835764dd BA |
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 | ||
933b45da S |
171 | spinlock_t intent_lock; |
172 | struct idr liids; | |
dacbb35e | 173 | struct idr riids; |
1d2ea36e S |
174 | struct work_struct intent_work; |
175 | struct list_head done_intents; | |
933b45da | 176 | |
64f95f87 | 177 | struct glink_core_rx_intent *buf; |
835764dd BA |
178 | int buf_offset; |
179 | int buf_size; | |
180 | ||
181 | struct completion open_ack; | |
182 | struct completion open_req; | |
27b9c5b6 S |
183 | |
184 | struct mutex intent_req_lock; | |
185 | bool intent_req_result; | |
186 | struct completion intent_req_comp; | |
835764dd BA |
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 | |
933b45da | 198 | #define RPM_CMD_INTENT 5 |
1d2ea36e | 199 | #define RPM_CMD_RX_DONE 6 |
933b45da S |
200 | #define RPM_CMD_RX_INTENT_REQ 7 |
201 | #define RPM_CMD_RX_INTENT_REQ_ACK 8 | |
835764dd BA |
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 | |
1d2ea36e | 206 | #define RPM_CMD_RX_DONE_W_REUSE 14 |
835764dd BA |
207 | |
208 | #define GLINK_FEATURE_INTENTLESS BIT(1) | |
209 | ||
1d2ea36e S |
210 | static void qcom_glink_rx_done_work(struct work_struct *work); |
211 | ||
835764dd BA |
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); | |
933b45da | 223 | spin_lock_init(&channel->intent_lock); |
1d2ea36e | 224 | |
835764dd BA |
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 | ||
1d2ea36e S |
231 | INIT_LIST_HEAD(&channel->done_intents); |
232 | INIT_WORK(&channel->intent_work, qcom_glink_rx_done_work); | |
233 | ||
933b45da | 234 | idr_init(&channel->liids); |
dacbb35e | 235 | idr_init(&channel->riids); |
835764dd BA |
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); | |
933b45da S |
245 | unsigned long flags; |
246 | ||
247 | spin_lock_irqsave(&channel->intent_lock, flags); | |
248 | idr_destroy(&channel->liids); | |
dacbb35e | 249 | idr_destroy(&channel->riids); |
933b45da | 250 | spin_unlock_irqrestore(&channel->intent_lock, flags); |
835764dd BA |
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, | |
b88eee97 | 262 | void *data, unsigned int offset, size_t count) |
835764dd | 263 | { |
b88eee97 | 264 | glink->rx_pipe->peak(glink->rx_pipe, data, offset, count); |
835764dd BA |
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 | ||
835764dd BA |
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) { | |
a7df9dfc | 301 | ret = -EAGAIN; |
835764dd BA |
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); | |
d31ad615 S |
324 | msg.param1 = cpu_to_le16(GLINK_VERSION_1); |
325 | msg.param2 = cpu_to_le32(glink->features); | |
835764dd BA |
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); | |
d31ad615 S |
335 | msg.param1 = cpu_to_le16(GLINK_VERSION_1); |
336 | msg.param2 = cpu_to_le32(glink->features); | |
835764dd BA |
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 | ||
27b9c5b6 S |
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 | ||
835764dd BA |
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; | |
44f6df92 | 391 | unsigned long flags; |
835764dd BA |
392 | |
393 | kref_get(&channel->refcount); | |
394 | ||
44f6df92 | 395 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd BA |
396 | ret = idr_alloc_cyclic(&glink->lcids, channel, |
397 | RPM_GLINK_CID_MIN, RPM_GLINK_CID_MAX, | |
44f6df92 S |
398 | GFP_ATOMIC); |
399 | spin_unlock_irqrestore(&glink->idr_lock, flags); | |
835764dd BA |
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: | |
44f6df92 | 417 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd BA |
418 | idr_remove(&glink->lcids, channel->lcid); |
419 | channel->lcid = 0; | |
44f6df92 | 420 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
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 | ||
1d2ea36e S |
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 | ||
d31ad615 S |
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 | ||
933b45da S |
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); | |
933b45da S |
638 | if (!intent) |
639 | return NULL; | |
640 | ||
641 | intent->data = kzalloc(size, GFP_KERNEL); | |
642 | if (!intent->data) | |
b775d158 | 643 | goto free_intent; |
933b45da S |
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); | |
b775d158 | 649 | goto free_data; |
933b45da S |
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; | |
b775d158 DC |
658 | |
659 | free_data: | |
660 | kfree(intent->data); | |
661 | free_intent: | |
662 | kfree(intent); | |
663 | return NULL; | |
933b45da S |
664 | } |
665 | ||
88c6060f S |
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 | ||
933b45da S |
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 | ||
835764dd BA |
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 | ||
b88eee97 | 750 | qcom_glink_rx_peak(glink, &dcmd->msg, 0, sizeof(dcmd->msg) + extra); |
835764dd BA |
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 | { | |
64f95f87 | 764 | struct glink_core_rx_intent *intent; |
835764dd BA |
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; | |
64f95f87 S |
774 | unsigned int liid; |
775 | int ret = 0; | |
44f6df92 | 776 | unsigned long flags; |
835764dd BA |
777 | |
778 | if (avail < sizeof(hdr)) { | |
779 | dev_dbg(glink->dev, "Not enough data in fifo\n"); | |
780 | return -EAGAIN; | |
781 | } | |
782 | ||
b88eee97 | 783 | qcom_glink_rx_peak(glink, &hdr, 0, sizeof(hdr)); |
835764dd BA |
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); | |
44f6df92 | 796 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd | 797 | channel = idr_find(&glink->rcids, rcid); |
44f6df92 | 798 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
799 | if (!channel) { |
800 | dev_dbg(glink->dev, "Data on non-existing channel\n"); | |
801 | ||
802 | /* Drop the message */ | |
64f95f87 | 803 | goto advance_rx; |
835764dd BA |
804 | } |
805 | ||
64f95f87 S |
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); | |
835764dd | 830 | |
64f95f87 S |
831 | spin_lock_irqsave(&channel->intent_lock, flags); |
832 | intent = idr_find(&channel->liids, liid); | |
833 | spin_unlock_irqrestore(&channel->intent_lock, flags); | |
835764dd | 834 | |
64f95f87 S |
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 | } | |
835764dd | 842 | |
64f95f87 S |
843 | if (intent->size - intent->offset < chunk_size) { |
844 | dev_err(glink->dev, "Insufficient space in intent\n"); | |
835764dd BA |
845 | |
846 | /* The packet header lied, drop payload */ | |
64f95f87 | 847 | goto advance_rx; |
835764dd BA |
848 | } |
849 | ||
64f95f87 | 850 | qcom_glink_rx_peak(glink, intent->data + intent->offset, |
b88eee97 | 851 | sizeof(hdr), chunk_size); |
64f95f87 | 852 | intent->offset += chunk_size; |
835764dd BA |
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, | |
64f95f87 S |
859 | intent->data, |
860 | intent->offset, | |
835764dd BA |
861 | channel->ept.priv, |
862 | RPMSG_ADDR_ANY); | |
863 | } | |
864 | spin_unlock(&channel->recv_lock); | |
865 | ||
64f95f87 | 866 | intent->offset = 0; |
835764dd | 867 | channel->buf = NULL; |
1d2ea36e S |
868 | |
869 | qcom_glink_rx_done(glink, channel, intent); | |
835764dd BA |
870 | } |
871 | ||
64f95f87 | 872 | advance_rx: |
b88eee97 | 873 | qcom_glink_rx_advance(glink, ALIGN(sizeof(hdr) + chunk_size, 8)); |
835764dd | 874 | |
64f95f87 | 875 | return ret; |
835764dd BA |
876 | } |
877 | ||
dacbb35e S |
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 | ||
835764dd BA |
940 | static int qcom_glink_rx_open_ack(struct qcom_glink *glink, unsigned int lcid) |
941 | { | |
942 | struct glink_channel *channel; | |
943 | ||
44f6df92 | 944 | spin_lock(&glink->idr_lock); |
835764dd | 945 | channel = idr_find(&glink->lcids, lcid); |
5f5423ff | 946 | spin_unlock(&glink->idr_lock); |
835764dd BA |
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; | |
ed43d098 | 965 | int ret = 0; |
835764dd BA |
966 | |
967 | for (;;) { | |
968 | avail = qcom_glink_rx_avail(glink); | |
969 | if (avail < sizeof(msg)) | |
970 | break; | |
971 | ||
b88eee97 | 972 | qcom_glink_rx_peak(glink, &msg, 0, sizeof(msg)); |
835764dd BA |
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: | |
933b45da | 983 | case RPM_CMD_RX_INTENT_REQ: |
835764dd BA |
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); | |
835764dd | 1002 | break; |
dacbb35e S |
1003 | case RPM_CMD_INTENT: |
1004 | qcom_glink_handle_intent(glink, param1, param2, avail); | |
1005 | break; | |
88c6060f S |
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; | |
27b9c5b6 S |
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; | |
835764dd BA |
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; | |
44f6df92 | 1037 | unsigned long flags; |
835764dd BA |
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*/ | |
44f6df92 | 1061 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd | 1062 | idr_remove(&glink->lcids, channel->lcid); |
44f6df92 | 1063 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
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; | |
44f6df92 | 1120 | unsigned long flags; |
835764dd | 1121 | |
44f6df92 | 1122 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd BA |
1123 | idr_for_each_entry(&glink->rcids, channel, cid) { |
1124 | if (!strcmp(channel->name, name)) | |
1125 | break; | |
1126 | } | |
44f6df92 | 1127 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
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 | ||
6bf68cbd S |
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 | ||
835764dd BA |
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 | ||
27b9c5b6 S |
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) | |
0a7480bd | 1205 | goto unlock; |
27b9c5b6 S |
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 | ||
0a7480bd | 1215 | unlock: |
27b9c5b6 S |
1216 | mutex_unlock(&channel->intent_req_lock); |
1217 | return ret; | |
1218 | } | |
1219 | ||
835764dd BA |
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; | |
11cb45a7 S |
1224 | struct glink_core_rx_intent *intent = NULL; |
1225 | struct glink_core_rx_intent *tmp; | |
1226 | int iid = 0; | |
835764dd BA |
1227 | struct { |
1228 | struct glink_msg msg; | |
1229 | __le32 chunk_size; | |
1230 | __le32 left_size; | |
1231 | } __packed req; | |
11cb45a7 S |
1232 | int ret; |
1233 | unsigned long flags; | |
1234 | ||
1235 | if (!glink->intentless) { | |
27b9c5b6 | 1236 | while (!intent) { |
11cb45a7 S |
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 */ | |
27b9c5b6 S |
1248 | if (intent) |
1249 | break; | |
1250 | ||
1251 | if (!wait) | |
11cb45a7 | 1252 | return -EBUSY; |
27b9c5b6 S |
1253 | |
1254 | ret = qcom_glink_request_intent(glink, channel, len); | |
1255 | if (ret < 0) | |
1256 | return ret; | |
11cb45a7 S |
1257 | } |
1258 | ||
1259 | iid = intent->id; | |
1260 | } | |
835764dd | 1261 | |
835764dd BA |
1262 | req.msg.cmd = cpu_to_le16(RPM_CMD_TX_DATA); |
1263 | req.msg.param1 = cpu_to_le16(channel->lcid); | |
11cb45a7 | 1264 | req.msg.param2 = cpu_to_le32(iid); |
835764dd BA |
1265 | req.chunk_size = cpu_to_le32(len); |
1266 | req.left_size = cpu_to_le32(0); | |
1267 | ||
11cb45a7 S |
1268 | ret = qcom_glink_tx(glink, &req, sizeof(req), data, len, wait); |
1269 | ||
1270 | /* Mark intent available if we failed */ | |
906cf29c | 1271 | if (ret && intent) |
11cb45a7 S |
1272 | intent->in_use = false; |
1273 | ||
1274 | return ret; | |
835764dd BA |
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, | |
6bf68cbd | 1317 | .announce_create = qcom_glink_announce_create, |
835764dd BA |
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; | |
44f6df92 | 1344 | unsigned long flags; |
835764dd | 1345 | |
44f6df92 | 1346 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd BA |
1347 | idr_for_each_entry(&glink->lcids, channel, lcid) { |
1348 | if (!strcmp(channel->name, name)) | |
1349 | break; | |
1350 | } | |
44f6df92 | 1351 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
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 | ||
44f6df92 S |
1362 | spin_lock_irqsave(&glink->idr_lock, flags); |
1363 | ret = idr_alloc(&glink->rcids, channel, rcid, rcid + 1, GFP_ATOMIC); | |
835764dd BA |
1364 | if (ret < 0) { |
1365 | dev_err(glink->dev, "Unable to insert channel into rcid list\n"); | |
44f6df92 | 1366 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1367 | goto free_channel; |
1368 | } | |
1369 | channel->rcid = ret; | |
44f6df92 | 1370 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
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: | |
44f6df92 | 1404 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd BA |
1405 | idr_remove(&glink->rcids, channel->rcid); |
1406 | channel->rcid = 0; | |
44f6df92 | 1407 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
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; | |
44f6df92 | 1420 | unsigned long flags; |
835764dd | 1421 | |
44f6df92 | 1422 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd | 1423 | channel = idr_find(&glink->rcids, rcid); |
44f6df92 | 1424 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1425 | if (WARN(!channel, "close request on unknown channel\n")) |
1426 | return; | |
1427 | ||
1d2ea36e S |
1428 | /* cancel pending rx_done work */ |
1429 | cancel_work_sync(&channel->intent_work); | |
1430 | ||
835764dd BA |
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 | ||
44f6df92 | 1441 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd BA |
1442 | idr_remove(&glink->rcids, channel->rcid); |
1443 | channel->rcid = 0; | |
44f6df92 | 1444 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
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; | |
44f6df92 | 1452 | unsigned long flags; |
835764dd | 1453 | |
44f6df92 | 1454 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd | 1455 | channel = idr_find(&glink->lcids, lcid); |
44f6df92 S |
1456 | if (WARN(!channel, "close ack on unknown channel\n")) { |
1457 | spin_unlock_irqrestore(&glink->idr_lock, flags); | |
835764dd | 1458 | return; |
44f6df92 | 1459 | } |
835764dd | 1460 | |
835764dd BA |
1461 | idr_remove(&glink->lcids, channel->lcid); |
1462 | channel->lcid = 0; | |
44f6df92 | 1463 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
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: | |
d31ad615 | 1497 | qcom_glink_receive_version(glink, param1, param2); |
835764dd BA |
1498 | break; |
1499 | case RPM_CMD_VERSION_ACK: | |
d31ad615 | 1500 | qcom_glink_receive_version_ack(glink, param1, param2); |
835764dd BA |
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; | |
933b45da S |
1511 | case RPM_CMD_RX_INTENT_REQ: |
1512 | qcom_glink_handle_intent_req(glink, param1, param2); | |
1513 | break; | |
835764dd BA |
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, | |
d31ad615 | 1524 | unsigned long features, |
835764dd | 1525 | struct qcom_glink_pipe *rx, |
933b45da S |
1526 | struct qcom_glink_pipe *tx, |
1527 | bool intentless) | |
835764dd BA |
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 | ||
d31ad615 | 1541 | glink->features = features; |
933b45da | 1542 | glink->intentless = intentless; |
d31ad615 | 1543 | |
835764dd BA |
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 | ||
44f6df92 | 1549 | spin_lock_init(&glink->idr_lock); |
835764dd BA |
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 | } | |
f8ff9777 | 1579 | EXPORT_SYMBOL_GPL(qcom_glink_native_probe); |
835764dd BA |
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; | |
44f6df92 | 1593 | unsigned long flags; |
835764dd BA |
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 | ||
44f6df92 | 1602 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd BA |
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); | |
44f6df92 | 1609 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
76cf1105 | 1610 | mbox_free_channel(glink->mbox_chan); |
835764dd | 1611 | } |
f8ff9777 | 1612 | EXPORT_SYMBOL_GPL(qcom_glink_native_remove); |
caf989c3 BA |
1613 | |
1614 | void qcom_glink_native_unregister(struct qcom_glink *glink) | |
1615 | { | |
1616 | device_unregister(glink->dev); | |
1617 | } | |
f8ff9777 | 1618 | EXPORT_SYMBOL_GPL(qcom_glink_native_unregister); |