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84369fbe | 1 | // SPDX-License-Identifier: GPL-2.0 |
835764dd BA |
2 | /* |
3 | * Copyright (c) 2016-2017, Linaro Ltd | |
835764dd BA |
4 | */ |
5 | ||
6 | #include <linux/idr.h> | |
7 | #include <linux/interrupt.h> | |
8 | #include <linux/io.h> | |
9 | #include <linux/list.h> | |
10 | #include <linux/mfd/syscon.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/of.h> | |
13 | #include <linux/of_address.h> | |
14 | #include <linux/of_irq.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/regmap.h> | |
17 | #include <linux/rpmsg.h> | |
6bf68cbd | 18 | #include <linux/sizes.h> |
835764dd BA |
19 | #include <linux/slab.h> |
20 | #include <linux/workqueue.h> | |
21 | #include <linux/mailbox_client.h> | |
22 | ||
23 | #include "rpmsg_internal.h" | |
24 | #include "qcom_glink_native.h" | |
25 | ||
26 | #define GLINK_NAME_SIZE 32 | |
d31ad615 | 27 | #define GLINK_VERSION_1 1 |
835764dd BA |
28 | |
29 | #define RPM_GLINK_CID_MIN 1 | |
30 | #define RPM_GLINK_CID_MAX 65536 | |
31 | ||
32 | struct glink_msg { | |
33 | __le16 cmd; | |
34 | __le16 param1; | |
35 | __le32 param2; | |
36 | u8 data[]; | |
37 | } __packed; | |
38 | ||
39 | /** | |
40 | * struct glink_defer_cmd - deferred incoming control message | |
41 | * @node: list node | |
42 | * @msg: message header | |
6f0b9584 | 43 | * @data: payload of the message |
835764dd BA |
44 | * |
45 | * Copy of a received control message, to be added to @rx_queue and processed | |
46 | * by @rx_work of @qcom_glink. | |
47 | */ | |
48 | struct glink_defer_cmd { | |
49 | struct list_head node; | |
50 | ||
51 | struct glink_msg msg; | |
52 | u8 data[]; | |
53 | }; | |
54 | ||
933b45da S |
55 | /** |
56 | * struct glink_core_rx_intent - RX intent | |
57 | * RX intent | |
58 | * | |
6f0b9584 SK |
59 | * @data: pointer to the data (may be NULL for zero-copy) |
60 | * @id: remote or local intent ID | |
61 | * @size: size of the original intent (do not modify) | |
62 | * @reuse: To mark if the intent can be reused after first use | |
63 | * @in_use: To mark if intent is already in use for the channel | |
64 | * @offset: next write offset (initially 0) | |
65 | * @node: list node | |
933b45da S |
66 | */ |
67 | struct glink_core_rx_intent { | |
68 | void *data; | |
69 | u32 id; | |
70 | size_t size; | |
71 | bool reuse; | |
72 | bool in_use; | |
73 | u32 offset; | |
1d2ea36e S |
74 | |
75 | struct list_head node; | |
933b45da S |
76 | }; |
77 | ||
835764dd BA |
78 | /** |
79 | * struct qcom_glink - driver context, relates to one remote subsystem | |
80 | * @dev: reference to the associated struct device | |
81 | * @mbox_client: mailbox client | |
82 | * @mbox_chan: mailbox channel | |
83 | * @rx_pipe: pipe object for receive FIFO | |
84 | * @tx_pipe: pipe object for transmit FIFO | |
85 | * @irq: IRQ for signaling incoming events | |
86 | * @rx_work: worker for handling received control messages | |
87 | * @rx_lock: protects the @rx_queue | |
88 | * @rx_queue: queue of received control messages to be processed in @rx_work | |
89 | * @tx_lock: synchronizes operations on the tx fifo | |
90 | * @idr_lock: synchronizes @lcids and @rcids modifications | |
91 | * @lcids: idr of all channels with a known local channel id | |
92 | * @rcids: idr of all channels with a known remote channel id | |
6f0b9584 SK |
93 | * @features: remote features |
94 | * @intentless: flag to indicate that there is no intent | |
835764dd BA |
95 | */ |
96 | struct qcom_glink { | |
97 | struct device *dev; | |
98 | ||
475452fc CL |
99 | const char *name; |
100 | ||
835764dd BA |
101 | struct mbox_client mbox_client; |
102 | struct mbox_chan *mbox_chan; | |
103 | ||
104 | struct qcom_glink_pipe *rx_pipe; | |
105 | struct qcom_glink_pipe *tx_pipe; | |
106 | ||
107 | int irq; | |
108 | ||
109 | struct work_struct rx_work; | |
110 | spinlock_t rx_lock; | |
111 | struct list_head rx_queue; | |
112 | ||
29fc9b38 | 113 | spinlock_t tx_lock; |
835764dd | 114 | |
44f6df92 | 115 | spinlock_t idr_lock; |
835764dd BA |
116 | struct idr lcids; |
117 | struct idr rcids; | |
d31ad615 S |
118 | unsigned long features; |
119 | ||
120 | bool intentless; | |
835764dd BA |
121 | }; |
122 | ||
123 | enum { | |
124 | GLINK_STATE_CLOSED, | |
125 | GLINK_STATE_OPENING, | |
126 | GLINK_STATE_OPEN, | |
127 | GLINK_STATE_CLOSING, | |
128 | }; | |
129 | ||
130 | /** | |
131 | * struct glink_channel - internal representation of a channel | |
132 | * @rpdev: rpdev reference, only used for primary endpoints | |
133 | * @ept: rpmsg endpoint this channel is associated with | |
134 | * @glink: qcom_glink context handle | |
135 | * @refcount: refcount for the channel object | |
136 | * @recv_lock: guard for @ept.cb | |
137 | * @name: unique channel name/identifier | |
138 | * @lcid: channel id, in local space | |
139 | * @rcid: channel id, in remote space | |
dacbb35e | 140 | * @intent_lock: lock for protection of @liids, @riids |
933b45da | 141 | * @liids: idr of all local intents |
dacbb35e | 142 | * @riids: idr of all remote intents |
1d2ea36e S |
143 | * @intent_work: worker responsible for transmitting rx_done packets |
144 | * @done_intents: list of intents that needs to be announced rx_done | |
835764dd BA |
145 | * @buf: receive buffer, for gathering fragments |
146 | * @buf_offset: write offset in @buf | |
147 | * @buf_size: size of current @buf | |
148 | * @open_ack: completed once remote has acked the open-request | |
149 | * @open_req: completed once open-request has been received | |
27b9c5b6 S |
150 | * @intent_req_lock: Synchronises multiple intent requests |
151 | * @intent_req_result: Result of intent request | |
152 | * @intent_req_comp: Completion for intent_req signalling | |
835764dd BA |
153 | */ |
154 | struct glink_channel { | |
155 | struct rpmsg_endpoint ept; | |
156 | ||
157 | struct rpmsg_device *rpdev; | |
158 | struct qcom_glink *glink; | |
159 | ||
160 | struct kref refcount; | |
161 | ||
162 | spinlock_t recv_lock; | |
163 | ||
164 | char *name; | |
165 | unsigned int lcid; | |
166 | unsigned int rcid; | |
167 | ||
933b45da S |
168 | spinlock_t intent_lock; |
169 | struct idr liids; | |
dacbb35e | 170 | struct idr riids; |
1d2ea36e S |
171 | struct work_struct intent_work; |
172 | struct list_head done_intents; | |
933b45da | 173 | |
64f95f87 | 174 | struct glink_core_rx_intent *buf; |
835764dd BA |
175 | int buf_offset; |
176 | int buf_size; | |
177 | ||
178 | struct completion open_ack; | |
179 | struct completion open_req; | |
27b9c5b6 S |
180 | |
181 | struct mutex intent_req_lock; | |
182 | bool intent_req_result; | |
183 | struct completion intent_req_comp; | |
835764dd BA |
184 | }; |
185 | ||
186 | #define to_glink_channel(_ept) container_of(_ept, struct glink_channel, ept) | |
187 | ||
188 | static const struct rpmsg_endpoint_ops glink_endpoint_ops; | |
189 | ||
190 | #define RPM_CMD_VERSION 0 | |
191 | #define RPM_CMD_VERSION_ACK 1 | |
192 | #define RPM_CMD_OPEN 2 | |
193 | #define RPM_CMD_CLOSE 3 | |
194 | #define RPM_CMD_OPEN_ACK 4 | |
933b45da | 195 | #define RPM_CMD_INTENT 5 |
1d2ea36e | 196 | #define RPM_CMD_RX_DONE 6 |
933b45da S |
197 | #define RPM_CMD_RX_INTENT_REQ 7 |
198 | #define RPM_CMD_RX_INTENT_REQ_ACK 8 | |
835764dd BA |
199 | #define RPM_CMD_TX_DATA 9 |
200 | #define RPM_CMD_CLOSE_ACK 11 | |
201 | #define RPM_CMD_TX_DATA_CONT 12 | |
202 | #define RPM_CMD_READ_NOTIF 13 | |
1d2ea36e | 203 | #define RPM_CMD_RX_DONE_W_REUSE 14 |
835764dd BA |
204 | |
205 | #define GLINK_FEATURE_INTENTLESS BIT(1) | |
206 | ||
1d2ea36e S |
207 | static void qcom_glink_rx_done_work(struct work_struct *work); |
208 | ||
835764dd BA |
209 | static struct glink_channel *qcom_glink_alloc_channel(struct qcom_glink *glink, |
210 | const char *name) | |
211 | { | |
212 | struct glink_channel *channel; | |
213 | ||
214 | channel = kzalloc(sizeof(*channel), GFP_KERNEL); | |
215 | if (!channel) | |
216 | return ERR_PTR(-ENOMEM); | |
217 | ||
218 | /* Setup glink internal glink_channel data */ | |
219 | spin_lock_init(&channel->recv_lock); | |
933b45da | 220 | spin_lock_init(&channel->intent_lock); |
fb416f69 | 221 | mutex_init(&channel->intent_req_lock); |
1d2ea36e | 222 | |
835764dd BA |
223 | channel->glink = glink; |
224 | channel->name = kstrdup(name, GFP_KERNEL); | |
225 | ||
226 | init_completion(&channel->open_req); | |
227 | init_completion(&channel->open_ack); | |
2394facb | 228 | init_completion(&channel->intent_req_comp); |
835764dd | 229 | |
1d2ea36e S |
230 | INIT_LIST_HEAD(&channel->done_intents); |
231 | INIT_WORK(&channel->intent_work, qcom_glink_rx_done_work); | |
232 | ||
933b45da | 233 | idr_init(&channel->liids); |
dacbb35e | 234 | idr_init(&channel->riids); |
835764dd BA |
235 | kref_init(&channel->refcount); |
236 | ||
237 | return channel; | |
238 | } | |
239 | ||
240 | static void qcom_glink_channel_release(struct kref *ref) | |
241 | { | |
242 | struct glink_channel *channel = container_of(ref, struct glink_channel, | |
243 | refcount); | |
c3dadc19 | 244 | struct glink_core_rx_intent *intent; |
b85f6b60 | 245 | struct glink_core_rx_intent *tmp; |
933b45da | 246 | unsigned long flags; |
b85f6b60 | 247 | int iid; |
933b45da | 248 | |
c3dadc19 BA |
249 | /* cancel pending rx_done work */ |
250 | cancel_work_sync(&channel->intent_work); | |
251 | ||
933b45da | 252 | spin_lock_irqsave(&channel->intent_lock, flags); |
c3dadc19 BA |
253 | /* Free all non-reuse intents pending rx_done work */ |
254 | list_for_each_entry_safe(intent, tmp, &channel->done_intents, node) { | |
255 | if (!intent->reuse) { | |
256 | kfree(intent->data); | |
257 | kfree(intent); | |
258 | } | |
259 | } | |
260 | ||
b85f6b60 AKN |
261 | idr_for_each_entry(&channel->liids, tmp, iid) { |
262 | kfree(tmp->data); | |
263 | kfree(tmp); | |
264 | } | |
933b45da | 265 | idr_destroy(&channel->liids); |
b85f6b60 AKN |
266 | |
267 | idr_for_each_entry(&channel->riids, tmp, iid) | |
268 | kfree(tmp); | |
dacbb35e | 269 | idr_destroy(&channel->riids); |
933b45da | 270 | spin_unlock_irqrestore(&channel->intent_lock, flags); |
835764dd BA |
271 | |
272 | kfree(channel->name); | |
273 | kfree(channel); | |
274 | } | |
275 | ||
276 | static size_t qcom_glink_rx_avail(struct qcom_glink *glink) | |
277 | { | |
278 | return glink->rx_pipe->avail(glink->rx_pipe); | |
279 | } | |
280 | ||
281 | static void qcom_glink_rx_peak(struct qcom_glink *glink, | |
b88eee97 | 282 | void *data, unsigned int offset, size_t count) |
835764dd | 283 | { |
b88eee97 | 284 | glink->rx_pipe->peak(glink->rx_pipe, data, offset, count); |
835764dd BA |
285 | } |
286 | ||
287 | static void qcom_glink_rx_advance(struct qcom_glink *glink, size_t count) | |
288 | { | |
289 | glink->rx_pipe->advance(glink->rx_pipe, count); | |
290 | } | |
291 | ||
292 | static size_t qcom_glink_tx_avail(struct qcom_glink *glink) | |
293 | { | |
294 | return glink->tx_pipe->avail(glink->tx_pipe); | |
295 | } | |
296 | ||
297 | static void qcom_glink_tx_write(struct qcom_glink *glink, | |
298 | const void *hdr, size_t hlen, | |
299 | const void *data, size_t dlen) | |
300 | { | |
301 | glink->tx_pipe->write(glink->tx_pipe, hdr, hlen, data, dlen); | |
302 | } | |
303 | ||
304 | static int qcom_glink_tx(struct qcom_glink *glink, | |
305 | const void *hdr, size_t hlen, | |
306 | const void *data, size_t dlen, bool wait) | |
307 | { | |
308 | unsigned int tlen = hlen + dlen; | |
29fc9b38 BA |
309 | unsigned long flags; |
310 | int ret = 0; | |
835764dd BA |
311 | |
312 | /* Reject packets that are too big */ | |
313 | if (tlen >= glink->tx_pipe->length) | |
314 | return -EINVAL; | |
315 | ||
29fc9b38 | 316 | spin_lock_irqsave(&glink->tx_lock, flags); |
835764dd BA |
317 | |
318 | while (qcom_glink_tx_avail(glink) < tlen) { | |
319 | if (!wait) { | |
a7df9dfc | 320 | ret = -EAGAIN; |
835764dd BA |
321 | goto out; |
322 | } | |
323 | ||
29fc9b38 BA |
324 | /* Wait without holding the tx_lock */ |
325 | spin_unlock_irqrestore(&glink->tx_lock, flags); | |
326 | ||
835764dd | 327 | usleep_range(10000, 15000); |
29fc9b38 BA |
328 | |
329 | spin_lock_irqsave(&glink->tx_lock, flags); | |
835764dd BA |
330 | } |
331 | ||
332 | qcom_glink_tx_write(glink, hdr, hlen, data, dlen); | |
333 | ||
334 | mbox_send_message(glink->mbox_chan, NULL); | |
335 | mbox_client_txdone(glink->mbox_chan, 0); | |
336 | ||
337 | out: | |
29fc9b38 | 338 | spin_unlock_irqrestore(&glink->tx_lock, flags); |
835764dd BA |
339 | |
340 | return ret; | |
341 | } | |
342 | ||
343 | static int qcom_glink_send_version(struct qcom_glink *glink) | |
344 | { | |
345 | struct glink_msg msg; | |
346 | ||
347 | msg.cmd = cpu_to_le16(RPM_CMD_VERSION); | |
d31ad615 S |
348 | msg.param1 = cpu_to_le16(GLINK_VERSION_1); |
349 | msg.param2 = cpu_to_le32(glink->features); | |
835764dd BA |
350 | |
351 | return qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); | |
352 | } | |
353 | ||
354 | static void qcom_glink_send_version_ack(struct qcom_glink *glink) | |
355 | { | |
356 | struct glink_msg msg; | |
357 | ||
358 | msg.cmd = cpu_to_le16(RPM_CMD_VERSION_ACK); | |
d31ad615 S |
359 | msg.param1 = cpu_to_le16(GLINK_VERSION_1); |
360 | msg.param2 = cpu_to_le32(glink->features); | |
835764dd BA |
361 | |
362 | qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); | |
363 | } | |
364 | ||
365 | static void qcom_glink_send_open_ack(struct qcom_glink *glink, | |
366 | struct glink_channel *channel) | |
367 | { | |
368 | struct glink_msg msg; | |
369 | ||
370 | msg.cmd = cpu_to_le16(RPM_CMD_OPEN_ACK); | |
371 | msg.param1 = cpu_to_le16(channel->rcid); | |
372 | msg.param2 = cpu_to_le32(0); | |
373 | ||
374 | qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); | |
375 | } | |
376 | ||
27b9c5b6 S |
377 | static void qcom_glink_handle_intent_req_ack(struct qcom_glink *glink, |
378 | unsigned int cid, bool granted) | |
379 | { | |
380 | struct glink_channel *channel; | |
381 | unsigned long flags; | |
382 | ||
383 | spin_lock_irqsave(&glink->idr_lock, flags); | |
384 | channel = idr_find(&glink->rcids, cid); | |
385 | spin_unlock_irqrestore(&glink->idr_lock, flags); | |
386 | if (!channel) { | |
387 | dev_err(glink->dev, "unable to find channel\n"); | |
388 | return; | |
389 | } | |
390 | ||
391 | channel->intent_req_result = granted; | |
392 | complete(&channel->intent_req_comp); | |
393 | } | |
394 | ||
835764dd BA |
395 | /** |
396 | * qcom_glink_send_open_req() - send a RPM_CMD_OPEN request to the remote | |
397 | * @glink: Ptr to the glink edge | |
398 | * @channel: Ptr to the channel that the open req is sent | |
399 | * | |
400 | * Allocates a local channel id and sends a RPM_CMD_OPEN message to the remote. | |
401 | * Will return with refcount held, regardless of outcome. | |
402 | * | |
403 | * Returns 0 on success, negative errno otherwise. | |
404 | */ | |
405 | static int qcom_glink_send_open_req(struct qcom_glink *glink, | |
406 | struct glink_channel *channel) | |
407 | { | |
408 | struct { | |
409 | struct glink_msg msg; | |
410 | u8 name[GLINK_NAME_SIZE]; | |
411 | } __packed req; | |
412 | int name_len = strlen(channel->name) + 1; | |
413 | int req_len = ALIGN(sizeof(req.msg) + name_len, 8); | |
414 | int ret; | |
44f6df92 | 415 | unsigned long flags; |
835764dd BA |
416 | |
417 | kref_get(&channel->refcount); | |
418 | ||
44f6df92 | 419 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd BA |
420 | ret = idr_alloc_cyclic(&glink->lcids, channel, |
421 | RPM_GLINK_CID_MIN, RPM_GLINK_CID_MAX, | |
44f6df92 S |
422 | GFP_ATOMIC); |
423 | spin_unlock_irqrestore(&glink->idr_lock, flags); | |
835764dd BA |
424 | if (ret < 0) |
425 | return ret; | |
426 | ||
427 | channel->lcid = ret; | |
428 | ||
429 | req.msg.cmd = cpu_to_le16(RPM_CMD_OPEN); | |
430 | req.msg.param1 = cpu_to_le16(channel->lcid); | |
431 | req.msg.param2 = cpu_to_le32(name_len); | |
432 | strcpy(req.name, channel->name); | |
433 | ||
434 | ret = qcom_glink_tx(glink, &req, req_len, NULL, 0, true); | |
435 | if (ret) | |
436 | goto remove_idr; | |
437 | ||
438 | return 0; | |
439 | ||
440 | remove_idr: | |
44f6df92 | 441 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd BA |
442 | idr_remove(&glink->lcids, channel->lcid); |
443 | channel->lcid = 0; | |
44f6df92 | 444 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
445 | |
446 | return ret; | |
447 | } | |
448 | ||
449 | static void qcom_glink_send_close_req(struct qcom_glink *glink, | |
450 | struct glink_channel *channel) | |
451 | { | |
452 | struct glink_msg req; | |
453 | ||
454 | req.cmd = cpu_to_le16(RPM_CMD_CLOSE); | |
455 | req.param1 = cpu_to_le16(channel->lcid); | |
456 | req.param2 = 0; | |
457 | ||
458 | qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true); | |
459 | } | |
460 | ||
461 | static void qcom_glink_send_close_ack(struct qcom_glink *glink, | |
462 | unsigned int rcid) | |
463 | { | |
464 | struct glink_msg req; | |
465 | ||
466 | req.cmd = cpu_to_le16(RPM_CMD_CLOSE_ACK); | |
467 | req.param1 = cpu_to_le16(rcid); | |
468 | req.param2 = 0; | |
469 | ||
470 | qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true); | |
471 | } | |
472 | ||
1d2ea36e S |
473 | static void qcom_glink_rx_done_work(struct work_struct *work) |
474 | { | |
475 | struct glink_channel *channel = container_of(work, struct glink_channel, | |
476 | intent_work); | |
477 | struct qcom_glink *glink = channel->glink; | |
478 | struct glink_core_rx_intent *intent, *tmp; | |
479 | struct { | |
480 | u16 id; | |
481 | u16 lcid; | |
482 | u32 liid; | |
483 | } __packed cmd; | |
484 | ||
485 | unsigned int cid = channel->lcid; | |
486 | unsigned int iid; | |
487 | bool reuse; | |
488 | unsigned long flags; | |
489 | ||
490 | spin_lock_irqsave(&channel->intent_lock, flags); | |
491 | list_for_each_entry_safe(intent, tmp, &channel->done_intents, node) { | |
492 | list_del(&intent->node); | |
493 | spin_unlock_irqrestore(&channel->intent_lock, flags); | |
494 | iid = intent->id; | |
495 | reuse = intent->reuse; | |
496 | ||
497 | cmd.id = reuse ? RPM_CMD_RX_DONE_W_REUSE : RPM_CMD_RX_DONE; | |
498 | cmd.lcid = cid; | |
499 | cmd.liid = iid; | |
500 | ||
501 | qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true); | |
502 | if (!reuse) { | |
503 | kfree(intent->data); | |
504 | kfree(intent); | |
505 | } | |
506 | spin_lock_irqsave(&channel->intent_lock, flags); | |
507 | } | |
508 | spin_unlock_irqrestore(&channel->intent_lock, flags); | |
509 | } | |
510 | ||
511 | static void qcom_glink_rx_done(struct qcom_glink *glink, | |
512 | struct glink_channel *channel, | |
513 | struct glink_core_rx_intent *intent) | |
514 | { | |
515 | /* We don't send RX_DONE to intentless systems */ | |
516 | if (glink->intentless) { | |
517 | kfree(intent->data); | |
518 | kfree(intent); | |
519 | return; | |
520 | } | |
521 | ||
522 | /* Take it off the tree of receive intents */ | |
523 | if (!intent->reuse) { | |
524 | spin_lock(&channel->intent_lock); | |
525 | idr_remove(&channel->liids, intent->id); | |
526 | spin_unlock(&channel->intent_lock); | |
527 | } | |
528 | ||
529 | /* Schedule the sending of a rx_done indication */ | |
530 | spin_lock(&channel->intent_lock); | |
531 | list_add_tail(&intent->node, &channel->done_intents); | |
532 | spin_unlock(&channel->intent_lock); | |
533 | ||
534 | schedule_work(&channel->intent_work); | |
535 | } | |
536 | ||
d31ad615 S |
537 | /** |
538 | * qcom_glink_receive_version() - receive version/features from remote system | |
539 | * | |
540 | * @glink: pointer to transport interface | |
6f0b9584 SK |
541 | * @version: remote version |
542 | * @features: remote features | |
d31ad615 S |
543 | * |
544 | * This function is called in response to a remote-initiated version/feature | |
545 | * negotiation sequence. | |
546 | */ | |
547 | static void qcom_glink_receive_version(struct qcom_glink *glink, | |
548 | u32 version, | |
549 | u32 features) | |
550 | { | |
551 | switch (version) { | |
552 | case 0: | |
553 | break; | |
554 | case GLINK_VERSION_1: | |
555 | glink->features &= features; | |
556 | /* FALLTHROUGH */ | |
557 | default: | |
558 | qcom_glink_send_version_ack(glink); | |
559 | break; | |
560 | } | |
561 | } | |
562 | ||
563 | /** | |
564 | * qcom_glink_receive_version_ack() - receive negotiation ack from remote system | |
565 | * | |
566 | * @glink: pointer to transport interface | |
6f0b9584 SK |
567 | * @version: remote version response |
568 | * @features: remote features response | |
d31ad615 S |
569 | * |
570 | * This function is called in response to a local-initiated version/feature | |
571 | * negotiation sequence and is the counter-offer from the remote side based | |
572 | * upon the initial version and feature set requested. | |
573 | */ | |
574 | static void qcom_glink_receive_version_ack(struct qcom_glink *glink, | |
575 | u32 version, | |
576 | u32 features) | |
577 | { | |
578 | switch (version) { | |
579 | case 0: | |
580 | /* Version negotiation failed */ | |
581 | break; | |
582 | case GLINK_VERSION_1: | |
583 | if (features == glink->features) | |
584 | break; | |
585 | ||
586 | glink->features &= features; | |
587 | /* FALLTHROUGH */ | |
588 | default: | |
589 | qcom_glink_send_version(glink); | |
590 | break; | |
591 | } | |
592 | } | |
593 | ||
933b45da S |
594 | /** |
595 | * qcom_glink_send_intent_req_ack() - convert an rx intent request ack cmd to | |
6f0b9584 | 596 | * wire format and transmit |
933b45da S |
597 | * @glink: The transport to transmit on. |
598 | * @channel: The glink channel | |
599 | * @granted: The request response to encode. | |
600 | * | |
601 | * Return: 0 on success or standard Linux error code. | |
602 | */ | |
603 | static int qcom_glink_send_intent_req_ack(struct qcom_glink *glink, | |
604 | struct glink_channel *channel, | |
605 | bool granted) | |
606 | { | |
607 | struct glink_msg msg; | |
608 | ||
609 | msg.cmd = cpu_to_le16(RPM_CMD_RX_INTENT_REQ_ACK); | |
610 | msg.param1 = cpu_to_le16(channel->lcid); | |
611 | msg.param2 = cpu_to_le32(granted); | |
612 | ||
613 | qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); | |
614 | ||
615 | return 0; | |
616 | } | |
617 | ||
618 | /** | |
619 | * qcom_glink_advertise_intent - convert an rx intent cmd to wire format and | |
620 | * transmit | |
621 | * @glink: The transport to transmit on. | |
622 | * @channel: The local channel | |
6f0b9584 | 623 | * @intent: The intent to pass on to remote. |
933b45da S |
624 | * |
625 | * Return: 0 on success or standard Linux error code. | |
626 | */ | |
627 | static int qcom_glink_advertise_intent(struct qcom_glink *glink, | |
628 | struct glink_channel *channel, | |
629 | struct glink_core_rx_intent *intent) | |
630 | { | |
631 | struct command { | |
427613ee SK |
632 | __le16 id; |
633 | __le16 lcid; | |
634 | __le32 count; | |
635 | __le32 size; | |
636 | __le32 liid; | |
933b45da S |
637 | } __packed; |
638 | struct command cmd; | |
639 | ||
640 | cmd.id = cpu_to_le16(RPM_CMD_INTENT); | |
641 | cmd.lcid = cpu_to_le16(channel->lcid); | |
642 | cmd.count = cpu_to_le32(1); | |
643 | cmd.size = cpu_to_le32(intent->size); | |
644 | cmd.liid = cpu_to_le32(intent->id); | |
645 | ||
646 | qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true); | |
647 | ||
648 | return 0; | |
649 | } | |
650 | ||
651 | static struct glink_core_rx_intent * | |
652 | qcom_glink_alloc_intent(struct qcom_glink *glink, | |
653 | struct glink_channel *channel, | |
654 | size_t size, | |
655 | bool reuseable) | |
656 | { | |
657 | struct glink_core_rx_intent *intent; | |
658 | int ret; | |
659 | unsigned long flags; | |
660 | ||
661 | intent = kzalloc(sizeof(*intent), GFP_KERNEL); | |
933b45da S |
662 | if (!intent) |
663 | return NULL; | |
664 | ||
665 | intent->data = kzalloc(size, GFP_KERNEL); | |
666 | if (!intent->data) | |
b775d158 | 667 | goto free_intent; |
933b45da S |
668 | |
669 | spin_lock_irqsave(&channel->intent_lock, flags); | |
670 | ret = idr_alloc_cyclic(&channel->liids, intent, 1, -1, GFP_ATOMIC); | |
671 | if (ret < 0) { | |
672 | spin_unlock_irqrestore(&channel->intent_lock, flags); | |
b775d158 | 673 | goto free_data; |
933b45da S |
674 | } |
675 | spin_unlock_irqrestore(&channel->intent_lock, flags); | |
676 | ||
677 | intent->id = ret; | |
678 | intent->size = size; | |
679 | intent->reuse = reuseable; | |
680 | ||
681 | return intent; | |
b775d158 DC |
682 | |
683 | free_data: | |
684 | kfree(intent->data); | |
685 | free_intent: | |
686 | kfree(intent); | |
687 | return NULL; | |
933b45da S |
688 | } |
689 | ||
88c6060f S |
690 | static void qcom_glink_handle_rx_done(struct qcom_glink *glink, |
691 | u32 cid, uint32_t iid, | |
692 | bool reuse) | |
693 | { | |
694 | struct glink_core_rx_intent *intent; | |
695 | struct glink_channel *channel; | |
696 | unsigned long flags; | |
697 | ||
698 | spin_lock_irqsave(&glink->idr_lock, flags); | |
699 | channel = idr_find(&glink->rcids, cid); | |
700 | spin_unlock_irqrestore(&glink->idr_lock, flags); | |
701 | if (!channel) { | |
702 | dev_err(glink->dev, "invalid channel id received\n"); | |
703 | return; | |
704 | } | |
705 | ||
706 | spin_lock_irqsave(&channel->intent_lock, flags); | |
707 | intent = idr_find(&channel->riids, iid); | |
708 | ||
709 | if (!intent) { | |
710 | spin_unlock_irqrestore(&channel->intent_lock, flags); | |
711 | dev_err(glink->dev, "invalid intent id received\n"); | |
712 | return; | |
713 | } | |
714 | ||
715 | intent->in_use = false; | |
716 | ||
717 | if (!reuse) { | |
718 | idr_remove(&channel->riids, intent->id); | |
719 | kfree(intent); | |
720 | } | |
721 | spin_unlock_irqrestore(&channel->intent_lock, flags); | |
722 | } | |
723 | ||
933b45da S |
724 | /** |
725 | * qcom_glink_handle_intent_req() - Receive a request for rx_intent | |
726 | * from remote side | |
6f0b9584 SK |
727 | * @glink: Pointer to the transport interface |
728 | * @cid: Remote channel ID | |
729 | * @size: size of the intent | |
933b45da S |
730 | * |
731 | * The function searches for the local channel to which the request for | |
732 | * rx_intent has arrived and allocates and notifies the remote back | |
733 | */ | |
734 | static void qcom_glink_handle_intent_req(struct qcom_glink *glink, | |
735 | u32 cid, size_t size) | |
736 | { | |
737 | struct glink_core_rx_intent *intent; | |
738 | struct glink_channel *channel; | |
739 | unsigned long flags; | |
740 | ||
741 | spin_lock_irqsave(&glink->idr_lock, flags); | |
742 | channel = idr_find(&glink->rcids, cid); | |
743 | spin_unlock_irqrestore(&glink->idr_lock, flags); | |
744 | ||
745 | if (!channel) { | |
746 | pr_err("%s channel not found for cid %d\n", __func__, cid); | |
747 | return; | |
748 | } | |
749 | ||
750 | intent = qcom_glink_alloc_intent(glink, channel, size, false); | |
751 | if (intent) | |
752 | qcom_glink_advertise_intent(glink, channel, intent); | |
753 | ||
754 | qcom_glink_send_intent_req_ack(glink, channel, !!intent); | |
755 | } | |
756 | ||
835764dd BA |
757 | static int qcom_glink_rx_defer(struct qcom_glink *glink, size_t extra) |
758 | { | |
759 | struct glink_defer_cmd *dcmd; | |
760 | ||
761 | extra = ALIGN(extra, 8); | |
762 | ||
763 | if (qcom_glink_rx_avail(glink) < sizeof(struct glink_msg) + extra) { | |
764 | dev_dbg(glink->dev, "Insufficient data in rx fifo"); | |
765 | return -ENXIO; | |
766 | } | |
767 | ||
768 | dcmd = kzalloc(sizeof(*dcmd) + extra, GFP_ATOMIC); | |
769 | if (!dcmd) | |
770 | return -ENOMEM; | |
771 | ||
772 | INIT_LIST_HEAD(&dcmd->node); | |
773 | ||
b88eee97 | 774 | qcom_glink_rx_peak(glink, &dcmd->msg, 0, sizeof(dcmd->msg) + extra); |
835764dd BA |
775 | |
776 | spin_lock(&glink->rx_lock); | |
777 | list_add_tail(&dcmd->node, &glink->rx_queue); | |
778 | spin_unlock(&glink->rx_lock); | |
779 | ||
780 | schedule_work(&glink->rx_work); | |
781 | qcom_glink_rx_advance(glink, sizeof(dcmd->msg) + extra); | |
782 | ||
783 | return 0; | |
784 | } | |
785 | ||
786 | static int qcom_glink_rx_data(struct qcom_glink *glink, size_t avail) | |
787 | { | |
64f95f87 | 788 | struct glink_core_rx_intent *intent; |
835764dd BA |
789 | struct glink_channel *channel; |
790 | struct { | |
791 | struct glink_msg msg; | |
792 | __le32 chunk_size; | |
793 | __le32 left_size; | |
794 | } __packed hdr; | |
795 | unsigned int chunk_size; | |
796 | unsigned int left_size; | |
797 | unsigned int rcid; | |
64f95f87 S |
798 | unsigned int liid; |
799 | int ret = 0; | |
44f6df92 | 800 | unsigned long flags; |
835764dd BA |
801 | |
802 | if (avail < sizeof(hdr)) { | |
803 | dev_dbg(glink->dev, "Not enough data in fifo\n"); | |
804 | return -EAGAIN; | |
805 | } | |
806 | ||
b88eee97 | 807 | qcom_glink_rx_peak(glink, &hdr, 0, sizeof(hdr)); |
835764dd BA |
808 | chunk_size = le32_to_cpu(hdr.chunk_size); |
809 | left_size = le32_to_cpu(hdr.left_size); | |
810 | ||
811 | if (avail < sizeof(hdr) + chunk_size) { | |
812 | dev_dbg(glink->dev, "Payload not yet in fifo\n"); | |
813 | return -EAGAIN; | |
814 | } | |
815 | ||
835764dd | 816 | rcid = le16_to_cpu(hdr.msg.param1); |
44f6df92 | 817 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd | 818 | channel = idr_find(&glink->rcids, rcid); |
44f6df92 | 819 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
820 | if (!channel) { |
821 | dev_dbg(glink->dev, "Data on non-existing channel\n"); | |
822 | ||
823 | /* Drop the message */ | |
64f95f87 | 824 | goto advance_rx; |
835764dd BA |
825 | } |
826 | ||
64f95f87 S |
827 | if (glink->intentless) { |
828 | /* Might have an ongoing, fragmented, message to append */ | |
829 | if (!channel->buf) { | |
830 | intent = kzalloc(sizeof(*intent), GFP_ATOMIC); | |
831 | if (!intent) | |
832 | return -ENOMEM; | |
833 | ||
834 | intent->data = kmalloc(chunk_size + left_size, | |
835 | GFP_ATOMIC); | |
836 | if (!intent->data) { | |
837 | kfree(intent); | |
838 | return -ENOMEM; | |
839 | } | |
840 | ||
841 | intent->id = 0xbabababa; | |
842 | intent->size = chunk_size + left_size; | |
843 | intent->offset = 0; | |
844 | ||
845 | channel->buf = intent; | |
846 | } else { | |
847 | intent = channel->buf; | |
848 | } | |
849 | } else { | |
850 | liid = le32_to_cpu(hdr.msg.param2); | |
835764dd | 851 | |
64f95f87 S |
852 | spin_lock_irqsave(&channel->intent_lock, flags); |
853 | intent = idr_find(&channel->liids, liid); | |
854 | spin_unlock_irqrestore(&channel->intent_lock, flags); | |
835764dd | 855 | |
64f95f87 S |
856 | if (!intent) { |
857 | dev_err(glink->dev, | |
858 | "no intent found for channel %s intent %d", | |
859 | channel->name, liid); | |
860 | goto advance_rx; | |
861 | } | |
862 | } | |
835764dd | 863 | |
64f95f87 S |
864 | if (intent->size - intent->offset < chunk_size) { |
865 | dev_err(glink->dev, "Insufficient space in intent\n"); | |
835764dd BA |
866 | |
867 | /* The packet header lied, drop payload */ | |
64f95f87 | 868 | goto advance_rx; |
835764dd BA |
869 | } |
870 | ||
64f95f87 | 871 | qcom_glink_rx_peak(glink, intent->data + intent->offset, |
b88eee97 | 872 | sizeof(hdr), chunk_size); |
64f95f87 | 873 | intent->offset += chunk_size; |
835764dd BA |
874 | |
875 | /* Handle message when no fragments remain to be received */ | |
876 | if (!left_size) { | |
877 | spin_lock(&channel->recv_lock); | |
878 | if (channel->ept.cb) { | |
879 | channel->ept.cb(channel->ept.rpdev, | |
64f95f87 S |
880 | intent->data, |
881 | intent->offset, | |
835764dd BA |
882 | channel->ept.priv, |
883 | RPMSG_ADDR_ANY); | |
884 | } | |
885 | spin_unlock(&channel->recv_lock); | |
886 | ||
64f95f87 | 887 | intent->offset = 0; |
835764dd | 888 | channel->buf = NULL; |
1d2ea36e S |
889 | |
890 | qcom_glink_rx_done(glink, channel, intent); | |
835764dd BA |
891 | } |
892 | ||
64f95f87 | 893 | advance_rx: |
b88eee97 | 894 | qcom_glink_rx_advance(glink, ALIGN(sizeof(hdr) + chunk_size, 8)); |
835764dd | 895 | |
64f95f87 | 896 | return ret; |
835764dd BA |
897 | } |
898 | ||
dacbb35e S |
899 | static void qcom_glink_handle_intent(struct qcom_glink *glink, |
900 | unsigned int cid, | |
901 | unsigned int count, | |
902 | size_t avail) | |
903 | { | |
904 | struct glink_core_rx_intent *intent; | |
905 | struct glink_channel *channel; | |
906 | struct intent_pair { | |
907 | __le32 size; | |
908 | __le32 iid; | |
909 | }; | |
910 | ||
911 | struct { | |
912 | struct glink_msg msg; | |
913 | struct intent_pair intents[]; | |
914 | } __packed * msg; | |
915 | ||
61c65f47 | 916 | const size_t msglen = struct_size(msg, intents, count); |
dacbb35e S |
917 | int ret; |
918 | int i; | |
919 | unsigned long flags; | |
920 | ||
921 | if (avail < msglen) { | |
922 | dev_dbg(glink->dev, "Not enough data in fifo\n"); | |
923 | return; | |
924 | } | |
925 | ||
926 | spin_lock_irqsave(&glink->idr_lock, flags); | |
927 | channel = idr_find(&glink->rcids, cid); | |
928 | spin_unlock_irqrestore(&glink->idr_lock, flags); | |
929 | if (!channel) { | |
930 | dev_err(glink->dev, "intents for non-existing channel\n"); | |
931 | return; | |
932 | } | |
933 | ||
934 | msg = kmalloc(msglen, GFP_ATOMIC); | |
935 | if (!msg) | |
936 | return; | |
937 | ||
938 | qcom_glink_rx_peak(glink, msg, 0, msglen); | |
939 | ||
940 | for (i = 0; i < count; ++i) { | |
941 | intent = kzalloc(sizeof(*intent), GFP_ATOMIC); | |
942 | if (!intent) | |
943 | break; | |
944 | ||
945 | intent->id = le32_to_cpu(msg->intents[i].iid); | |
946 | intent->size = le32_to_cpu(msg->intents[i].size); | |
947 | ||
948 | spin_lock_irqsave(&channel->intent_lock, flags); | |
949 | ret = idr_alloc(&channel->riids, intent, | |
950 | intent->id, intent->id + 1, GFP_ATOMIC); | |
951 | spin_unlock_irqrestore(&channel->intent_lock, flags); | |
952 | ||
953 | if (ret < 0) | |
954 | dev_err(glink->dev, "failed to store remote intent\n"); | |
955 | } | |
956 | ||
957 | kfree(msg); | |
958 | qcom_glink_rx_advance(glink, ALIGN(msglen, 8)); | |
959 | } | |
960 | ||
835764dd BA |
961 | static int qcom_glink_rx_open_ack(struct qcom_glink *glink, unsigned int lcid) |
962 | { | |
963 | struct glink_channel *channel; | |
964 | ||
44f6df92 | 965 | spin_lock(&glink->idr_lock); |
835764dd | 966 | channel = idr_find(&glink->lcids, lcid); |
5f5423ff | 967 | spin_unlock(&glink->idr_lock); |
835764dd BA |
968 | if (!channel) { |
969 | dev_err(glink->dev, "Invalid open ack packet\n"); | |
970 | return -EINVAL; | |
971 | } | |
972 | ||
973 | complete(&channel->open_ack); | |
974 | ||
975 | return 0; | |
976 | } | |
977 | ||
978 | static irqreturn_t qcom_glink_native_intr(int irq, void *data) | |
979 | { | |
980 | struct qcom_glink *glink = data; | |
981 | struct glink_msg msg; | |
982 | unsigned int param1; | |
983 | unsigned int param2; | |
984 | unsigned int avail; | |
985 | unsigned int cmd; | |
ed43d098 | 986 | int ret = 0; |
835764dd BA |
987 | |
988 | for (;;) { | |
989 | avail = qcom_glink_rx_avail(glink); | |
990 | if (avail < sizeof(msg)) | |
991 | break; | |
992 | ||
b88eee97 | 993 | qcom_glink_rx_peak(glink, &msg, 0, sizeof(msg)); |
835764dd BA |
994 | |
995 | cmd = le16_to_cpu(msg.cmd); | |
996 | param1 = le16_to_cpu(msg.param1); | |
997 | param2 = le32_to_cpu(msg.param2); | |
998 | ||
999 | switch (cmd) { | |
1000 | case RPM_CMD_VERSION: | |
1001 | case RPM_CMD_VERSION_ACK: | |
1002 | case RPM_CMD_CLOSE: | |
1003 | case RPM_CMD_CLOSE_ACK: | |
933b45da | 1004 | case RPM_CMD_RX_INTENT_REQ: |
835764dd BA |
1005 | ret = qcom_glink_rx_defer(glink, 0); |
1006 | break; | |
1007 | case RPM_CMD_OPEN_ACK: | |
1008 | ret = qcom_glink_rx_open_ack(glink, param1); | |
1009 | qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); | |
1010 | break; | |
1011 | case RPM_CMD_OPEN: | |
1012 | ret = qcom_glink_rx_defer(glink, param2); | |
1013 | break; | |
1014 | case RPM_CMD_TX_DATA: | |
1015 | case RPM_CMD_TX_DATA_CONT: | |
1016 | ret = qcom_glink_rx_data(glink, avail); | |
1017 | break; | |
1018 | case RPM_CMD_READ_NOTIF: | |
1019 | qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); | |
1020 | ||
1021 | mbox_send_message(glink->mbox_chan, NULL); | |
1022 | mbox_client_txdone(glink->mbox_chan, 0); | |
835764dd | 1023 | break; |
dacbb35e S |
1024 | case RPM_CMD_INTENT: |
1025 | qcom_glink_handle_intent(glink, param1, param2, avail); | |
1026 | break; | |
88c6060f S |
1027 | case RPM_CMD_RX_DONE: |
1028 | qcom_glink_handle_rx_done(glink, param1, param2, false); | |
1029 | qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); | |
1030 | break; | |
1031 | case RPM_CMD_RX_DONE_W_REUSE: | |
1032 | qcom_glink_handle_rx_done(glink, param1, param2, true); | |
1033 | qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); | |
1034 | break; | |
27b9c5b6 S |
1035 | case RPM_CMD_RX_INTENT_REQ_ACK: |
1036 | qcom_glink_handle_intent_req_ack(glink, param1, param2); | |
1037 | qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); | |
1038 | break; | |
835764dd BA |
1039 | default: |
1040 | dev_err(glink->dev, "unhandled rx cmd: %d\n", cmd); | |
1041 | ret = -EINVAL; | |
1042 | break; | |
1043 | } | |
1044 | ||
1045 | if (ret) | |
1046 | break; | |
1047 | } | |
1048 | ||
1049 | return IRQ_HANDLED; | |
1050 | } | |
1051 | ||
1052 | /* Locally initiated rpmsg_create_ept */ | |
1053 | static struct glink_channel *qcom_glink_create_local(struct qcom_glink *glink, | |
1054 | const char *name) | |
1055 | { | |
1056 | struct glink_channel *channel; | |
1057 | int ret; | |
44f6df92 | 1058 | unsigned long flags; |
835764dd BA |
1059 | |
1060 | channel = qcom_glink_alloc_channel(glink, name); | |
1061 | if (IS_ERR(channel)) | |
1062 | return ERR_CAST(channel); | |
1063 | ||
1064 | ret = qcom_glink_send_open_req(glink, channel); | |
1065 | if (ret) | |
1066 | goto release_channel; | |
1067 | ||
1068 | ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ); | |
1069 | if (!ret) | |
1070 | goto err_timeout; | |
1071 | ||
1072 | ret = wait_for_completion_timeout(&channel->open_req, 5 * HZ); | |
1073 | if (!ret) | |
1074 | goto err_timeout; | |
1075 | ||
1076 | qcom_glink_send_open_ack(glink, channel); | |
1077 | ||
1078 | return channel; | |
1079 | ||
1080 | err_timeout: | |
1081 | /* qcom_glink_send_open_req() did register the channel in lcids*/ | |
44f6df92 | 1082 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd | 1083 | idr_remove(&glink->lcids, channel->lcid); |
44f6df92 | 1084 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1085 | |
1086 | release_channel: | |
1087 | /* Release qcom_glink_send_open_req() reference */ | |
1088 | kref_put(&channel->refcount, qcom_glink_channel_release); | |
1089 | /* Release qcom_glink_alloc_channel() reference */ | |
1090 | kref_put(&channel->refcount, qcom_glink_channel_release); | |
1091 | ||
1092 | return ERR_PTR(-ETIMEDOUT); | |
1093 | } | |
1094 | ||
1095 | /* Remote initiated rpmsg_create_ept */ | |
1096 | static int qcom_glink_create_remote(struct qcom_glink *glink, | |
1097 | struct glink_channel *channel) | |
1098 | { | |
1099 | int ret; | |
1100 | ||
1101 | qcom_glink_send_open_ack(glink, channel); | |
1102 | ||
1103 | ret = qcom_glink_send_open_req(glink, channel); | |
1104 | if (ret) | |
1105 | goto close_link; | |
1106 | ||
1107 | ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ); | |
1108 | if (!ret) { | |
1109 | ret = -ETIMEDOUT; | |
1110 | goto close_link; | |
1111 | } | |
1112 | ||
1113 | return 0; | |
1114 | ||
1115 | close_link: | |
1116 | /* | |
1117 | * Send a close request to "undo" our open-ack. The close-ack will | |
ac74ea01 AKN |
1118 | * release qcom_glink_send_open_req() reference and the last reference |
1119 | * will be relesed after receiving remote_close or transport unregister | |
1120 | * by calling qcom_glink_native_remove(). | |
835764dd BA |
1121 | */ |
1122 | qcom_glink_send_close_req(glink, channel); | |
1123 | ||
835764dd BA |
1124 | return ret; |
1125 | } | |
1126 | ||
1127 | static struct rpmsg_endpoint *qcom_glink_create_ept(struct rpmsg_device *rpdev, | |
1128 | rpmsg_rx_cb_t cb, | |
1129 | void *priv, | |
1130 | struct rpmsg_channel_info | |
1131 | chinfo) | |
1132 | { | |
1133 | struct glink_channel *parent = to_glink_channel(rpdev->ept); | |
1134 | struct glink_channel *channel; | |
1135 | struct qcom_glink *glink = parent->glink; | |
1136 | struct rpmsg_endpoint *ept; | |
1137 | const char *name = chinfo.name; | |
1138 | int cid; | |
1139 | int ret; | |
44f6df92 | 1140 | unsigned long flags; |
835764dd | 1141 | |
44f6df92 | 1142 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd BA |
1143 | idr_for_each_entry(&glink->rcids, channel, cid) { |
1144 | if (!strcmp(channel->name, name)) | |
1145 | break; | |
1146 | } | |
44f6df92 | 1147 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1148 | |
1149 | if (!channel) { | |
1150 | channel = qcom_glink_create_local(glink, name); | |
1151 | if (IS_ERR(channel)) | |
1152 | return NULL; | |
1153 | } else { | |
1154 | ret = qcom_glink_create_remote(glink, channel); | |
1155 | if (ret) | |
1156 | return NULL; | |
1157 | } | |
1158 | ||
1159 | ept = &channel->ept; | |
1160 | ept->rpdev = rpdev; | |
1161 | ept->cb = cb; | |
1162 | ept->priv = priv; | |
1163 | ept->ops = &glink_endpoint_ops; | |
1164 | ||
1165 | return ept; | |
1166 | } | |
1167 | ||
6bf68cbd S |
1168 | static int qcom_glink_announce_create(struct rpmsg_device *rpdev) |
1169 | { | |
1170 | struct glink_channel *channel = to_glink_channel(rpdev->ept); | |
07389377 | 1171 | struct device_node *np = rpdev->dev.of_node; |
6bf68cbd | 1172 | struct qcom_glink *glink = channel->glink; |
07389377 CL |
1173 | struct glink_core_rx_intent *intent; |
1174 | const struct property *prop = NULL; | |
1175 | __be32 defaults[] = { cpu_to_be32(SZ_1K), cpu_to_be32(5) }; | |
1176 | int num_intents; | |
1177 | int num_groups = 1; | |
1178 | __be32 *val = defaults; | |
1179 | int size; | |
1180 | ||
1181 | if (glink->intentless) | |
1182 | return 0; | |
1183 | ||
1184 | prop = of_find_property(np, "qcom,intents", NULL); | |
1185 | if (prop) { | |
1186 | val = prop->value; | |
1187 | num_groups = prop->length / sizeof(u32) / 2; | |
1188 | } | |
6bf68cbd S |
1189 | |
1190 | /* Channel is now open, advertise base set of intents */ | |
07389377 CL |
1191 | while (num_groups--) { |
1192 | size = be32_to_cpup(val++); | |
1193 | num_intents = be32_to_cpup(val++); | |
1194 | while (num_intents--) { | |
1195 | intent = qcom_glink_alloc_intent(glink, channel, size, | |
1196 | true); | |
1197 | if (!intent) | |
1198 | break; | |
6bf68cbd | 1199 | |
07389377 CL |
1200 | qcom_glink_advertise_intent(glink, channel, intent); |
1201 | } | |
6bf68cbd | 1202 | } |
6bf68cbd S |
1203 | return 0; |
1204 | } | |
1205 | ||
835764dd BA |
1206 | static void qcom_glink_destroy_ept(struct rpmsg_endpoint *ept) |
1207 | { | |
1208 | struct glink_channel *channel = to_glink_channel(ept); | |
1209 | struct qcom_glink *glink = channel->glink; | |
1210 | unsigned long flags; | |
1211 | ||
1212 | spin_lock_irqsave(&channel->recv_lock, flags); | |
1213 | channel->ept.cb = NULL; | |
1214 | spin_unlock_irqrestore(&channel->recv_lock, flags); | |
1215 | ||
1216 | /* Decouple the potential rpdev from the channel */ | |
1217 | channel->rpdev = NULL; | |
1218 | ||
1219 | qcom_glink_send_close_req(glink, channel); | |
1220 | } | |
1221 | ||
27b9c5b6 S |
1222 | static int qcom_glink_request_intent(struct qcom_glink *glink, |
1223 | struct glink_channel *channel, | |
1224 | size_t size) | |
1225 | { | |
1226 | struct { | |
1227 | u16 id; | |
1228 | u16 cid; | |
1229 | u32 size; | |
1230 | } __packed cmd; | |
1231 | ||
1232 | int ret; | |
1233 | ||
1234 | mutex_lock(&channel->intent_req_lock); | |
1235 | ||
1236 | reinit_completion(&channel->intent_req_comp); | |
1237 | ||
1238 | cmd.id = RPM_CMD_RX_INTENT_REQ; | |
1239 | cmd.cid = channel->lcid; | |
1240 | cmd.size = size; | |
1241 | ||
1242 | ret = qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true); | |
1243 | if (ret) | |
0a7480bd | 1244 | goto unlock; |
27b9c5b6 S |
1245 | |
1246 | ret = wait_for_completion_timeout(&channel->intent_req_comp, 10 * HZ); | |
1247 | if (!ret) { | |
1248 | dev_err(glink->dev, "intent request timed out\n"); | |
1249 | ret = -ETIMEDOUT; | |
1250 | } else { | |
1251 | ret = channel->intent_req_result ? 0 : -ECANCELED; | |
1252 | } | |
1253 | ||
0a7480bd | 1254 | unlock: |
27b9c5b6 S |
1255 | mutex_unlock(&channel->intent_req_lock); |
1256 | return ret; | |
1257 | } | |
1258 | ||
835764dd BA |
1259 | static int __qcom_glink_send(struct glink_channel *channel, |
1260 | void *data, int len, bool wait) | |
1261 | { | |
1262 | struct qcom_glink *glink = channel->glink; | |
11cb45a7 S |
1263 | struct glink_core_rx_intent *intent = NULL; |
1264 | struct glink_core_rx_intent *tmp; | |
1265 | int iid = 0; | |
835764dd BA |
1266 | struct { |
1267 | struct glink_msg msg; | |
1268 | __le32 chunk_size; | |
1269 | __le32 left_size; | |
1270 | } __packed req; | |
11cb45a7 S |
1271 | int ret; |
1272 | unsigned long flags; | |
1273 | ||
1274 | if (!glink->intentless) { | |
27b9c5b6 | 1275 | while (!intent) { |
11cb45a7 S |
1276 | spin_lock_irqsave(&channel->intent_lock, flags); |
1277 | idr_for_each_entry(&channel->riids, tmp, iid) { | |
1278 | if (tmp->size >= len && !tmp->in_use) { | |
29031870 CL |
1279 | if (!intent) |
1280 | intent = tmp; | |
1281 | else if (intent->size > tmp->size) | |
1282 | intent = tmp; | |
1283 | if (intent->size == len) | |
1284 | break; | |
11cb45a7 S |
1285 | } |
1286 | } | |
29031870 CL |
1287 | if (intent) |
1288 | intent->in_use = true; | |
11cb45a7 S |
1289 | spin_unlock_irqrestore(&channel->intent_lock, flags); |
1290 | ||
1291 | /* We found an available intent */ | |
27b9c5b6 S |
1292 | if (intent) |
1293 | break; | |
1294 | ||
1295 | if (!wait) | |
11cb45a7 | 1296 | return -EBUSY; |
27b9c5b6 S |
1297 | |
1298 | ret = qcom_glink_request_intent(glink, channel, len); | |
1299 | if (ret < 0) | |
1300 | return ret; | |
11cb45a7 S |
1301 | } |
1302 | ||
1303 | iid = intent->id; | |
1304 | } | |
835764dd | 1305 | |
835764dd BA |
1306 | req.msg.cmd = cpu_to_le16(RPM_CMD_TX_DATA); |
1307 | req.msg.param1 = cpu_to_le16(channel->lcid); | |
11cb45a7 | 1308 | req.msg.param2 = cpu_to_le32(iid); |
835764dd BA |
1309 | req.chunk_size = cpu_to_le32(len); |
1310 | req.left_size = cpu_to_le32(0); | |
1311 | ||
11cb45a7 S |
1312 | ret = qcom_glink_tx(glink, &req, sizeof(req), data, len, wait); |
1313 | ||
1314 | /* Mark intent available if we failed */ | |
906cf29c | 1315 | if (ret && intent) |
11cb45a7 S |
1316 | intent->in_use = false; |
1317 | ||
1318 | return ret; | |
835764dd BA |
1319 | } |
1320 | ||
1321 | static int qcom_glink_send(struct rpmsg_endpoint *ept, void *data, int len) | |
1322 | { | |
1323 | struct glink_channel *channel = to_glink_channel(ept); | |
1324 | ||
1325 | return __qcom_glink_send(channel, data, len, true); | |
1326 | } | |
1327 | ||
1328 | static int qcom_glink_trysend(struct rpmsg_endpoint *ept, void *data, int len) | |
1329 | { | |
1330 | struct glink_channel *channel = to_glink_channel(ept); | |
1331 | ||
1332 | return __qcom_glink_send(channel, data, len, false); | |
1333 | } | |
1334 | ||
1335 | /* | |
1336 | * Finds the device_node for the glink child interested in this channel. | |
1337 | */ | |
1338 | static struct device_node *qcom_glink_match_channel(struct device_node *node, | |
1339 | const char *channel) | |
1340 | { | |
1341 | struct device_node *child; | |
1342 | const char *name; | |
1343 | const char *key; | |
1344 | int ret; | |
1345 | ||
1346 | for_each_available_child_of_node(node, child) { | |
1347 | key = "qcom,glink-channels"; | |
1348 | ret = of_property_read_string(child, key, &name); | |
1349 | if (ret) | |
1350 | continue; | |
1351 | ||
1352 | if (strcmp(name, channel) == 0) | |
1353 | return child; | |
1354 | } | |
1355 | ||
1356 | return NULL; | |
1357 | } | |
1358 | ||
1359 | static const struct rpmsg_device_ops glink_device_ops = { | |
1360 | .create_ept = qcom_glink_create_ept, | |
6bf68cbd | 1361 | .announce_create = qcom_glink_announce_create, |
835764dd BA |
1362 | }; |
1363 | ||
1364 | static const struct rpmsg_endpoint_ops glink_endpoint_ops = { | |
1365 | .destroy_ept = qcom_glink_destroy_ept, | |
1366 | .send = qcom_glink_send, | |
1367 | .trysend = qcom_glink_trysend, | |
1368 | }; | |
1369 | ||
1370 | static void qcom_glink_rpdev_release(struct device *dev) | |
1371 | { | |
1372 | struct rpmsg_device *rpdev = to_rpmsg_device(dev); | |
1373 | struct glink_channel *channel = to_glink_channel(rpdev->ept); | |
1374 | ||
1375 | channel->rpdev = NULL; | |
1376 | kfree(rpdev); | |
1377 | } | |
1378 | ||
1379 | static int qcom_glink_rx_open(struct qcom_glink *glink, unsigned int rcid, | |
1380 | char *name) | |
1381 | { | |
1382 | struct glink_channel *channel; | |
1383 | struct rpmsg_device *rpdev; | |
1384 | bool create_device = false; | |
1385 | struct device_node *node; | |
1386 | int lcid; | |
1387 | int ret; | |
44f6df92 | 1388 | unsigned long flags; |
835764dd | 1389 | |
44f6df92 | 1390 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd BA |
1391 | idr_for_each_entry(&glink->lcids, channel, lcid) { |
1392 | if (!strcmp(channel->name, name)) | |
1393 | break; | |
1394 | } | |
44f6df92 | 1395 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1396 | |
1397 | if (!channel) { | |
1398 | channel = qcom_glink_alloc_channel(glink, name); | |
1399 | if (IS_ERR(channel)) | |
1400 | return PTR_ERR(channel); | |
1401 | ||
1402 | /* The opening dance was initiated by the remote */ | |
1403 | create_device = true; | |
1404 | } | |
1405 | ||
44f6df92 S |
1406 | spin_lock_irqsave(&glink->idr_lock, flags); |
1407 | ret = idr_alloc(&glink->rcids, channel, rcid, rcid + 1, GFP_ATOMIC); | |
835764dd BA |
1408 | if (ret < 0) { |
1409 | dev_err(glink->dev, "Unable to insert channel into rcid list\n"); | |
44f6df92 | 1410 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1411 | goto free_channel; |
1412 | } | |
1413 | channel->rcid = ret; | |
44f6df92 | 1414 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1415 | |
1416 | complete(&channel->open_req); | |
1417 | ||
1418 | if (create_device) { | |
1419 | rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL); | |
1420 | if (!rpdev) { | |
1421 | ret = -ENOMEM; | |
1422 | goto rcid_remove; | |
1423 | } | |
1424 | ||
1425 | rpdev->ept = &channel->ept; | |
1426 | strncpy(rpdev->id.name, name, RPMSG_NAME_SIZE); | |
1427 | rpdev->src = RPMSG_ADDR_ANY; | |
1428 | rpdev->dst = RPMSG_ADDR_ANY; | |
1429 | rpdev->ops = &glink_device_ops; | |
1430 | ||
1431 | node = qcom_glink_match_channel(glink->dev->of_node, name); | |
1432 | rpdev->dev.of_node = node; | |
1433 | rpdev->dev.parent = glink->dev; | |
1434 | rpdev->dev.release = qcom_glink_rpdev_release; | |
1435 | ||
1436 | ret = rpmsg_register_device(rpdev); | |
1437 | if (ret) | |
f7e71498 | 1438 | goto rcid_remove; |
835764dd BA |
1439 | |
1440 | channel->rpdev = rpdev; | |
1441 | } | |
1442 | ||
1443 | return 0; | |
1444 | ||
835764dd | 1445 | rcid_remove: |
44f6df92 | 1446 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd BA |
1447 | idr_remove(&glink->rcids, channel->rcid); |
1448 | channel->rcid = 0; | |
44f6df92 | 1449 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1450 | free_channel: |
1451 | /* Release the reference, iff we took it */ | |
1452 | if (create_device) | |
1453 | kref_put(&channel->refcount, qcom_glink_channel_release); | |
1454 | ||
1455 | return ret; | |
1456 | } | |
1457 | ||
1458 | static void qcom_glink_rx_close(struct qcom_glink *glink, unsigned int rcid) | |
1459 | { | |
1460 | struct rpmsg_channel_info chinfo; | |
1461 | struct glink_channel *channel; | |
44f6df92 | 1462 | unsigned long flags; |
835764dd | 1463 | |
44f6df92 | 1464 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd | 1465 | channel = idr_find(&glink->rcids, rcid); |
44f6df92 | 1466 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1467 | if (WARN(!channel, "close request on unknown channel\n")) |
1468 | return; | |
1469 | ||
1d2ea36e S |
1470 | /* cancel pending rx_done work */ |
1471 | cancel_work_sync(&channel->intent_work); | |
1472 | ||
835764dd BA |
1473 | if (channel->rpdev) { |
1474 | strncpy(chinfo.name, channel->name, sizeof(chinfo.name)); | |
1475 | chinfo.src = RPMSG_ADDR_ANY; | |
1476 | chinfo.dst = RPMSG_ADDR_ANY; | |
1477 | ||
1478 | rpmsg_unregister_device(glink->dev, &chinfo); | |
1479 | } | |
1480 | ||
1481 | qcom_glink_send_close_ack(glink, channel->rcid); | |
1482 | ||
44f6df92 | 1483 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd BA |
1484 | idr_remove(&glink->rcids, channel->rcid); |
1485 | channel->rcid = 0; | |
44f6df92 | 1486 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1487 | |
1488 | kref_put(&channel->refcount, qcom_glink_channel_release); | |
1489 | } | |
1490 | ||
1491 | static void qcom_glink_rx_close_ack(struct qcom_glink *glink, unsigned int lcid) | |
1492 | { | |
1493 | struct glink_channel *channel; | |
44f6df92 | 1494 | unsigned long flags; |
835764dd | 1495 | |
44f6df92 | 1496 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd | 1497 | channel = idr_find(&glink->lcids, lcid); |
44f6df92 S |
1498 | if (WARN(!channel, "close ack on unknown channel\n")) { |
1499 | spin_unlock_irqrestore(&glink->idr_lock, flags); | |
835764dd | 1500 | return; |
44f6df92 | 1501 | } |
835764dd | 1502 | |
835764dd BA |
1503 | idr_remove(&glink->lcids, channel->lcid); |
1504 | channel->lcid = 0; | |
44f6df92 | 1505 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1506 | |
1507 | kref_put(&channel->refcount, qcom_glink_channel_release); | |
1508 | } | |
1509 | ||
1510 | static void qcom_glink_work(struct work_struct *work) | |
1511 | { | |
1512 | struct qcom_glink *glink = container_of(work, struct qcom_glink, | |
1513 | rx_work); | |
1514 | struct glink_defer_cmd *dcmd; | |
1515 | struct glink_msg *msg; | |
1516 | unsigned long flags; | |
1517 | unsigned int param1; | |
1518 | unsigned int param2; | |
1519 | unsigned int cmd; | |
1520 | ||
1521 | for (;;) { | |
1522 | spin_lock_irqsave(&glink->rx_lock, flags); | |
1523 | if (list_empty(&glink->rx_queue)) { | |
1524 | spin_unlock_irqrestore(&glink->rx_lock, flags); | |
1525 | break; | |
1526 | } | |
1527 | dcmd = list_first_entry(&glink->rx_queue, | |
1528 | struct glink_defer_cmd, node); | |
1529 | list_del(&dcmd->node); | |
1530 | spin_unlock_irqrestore(&glink->rx_lock, flags); | |
1531 | ||
1532 | msg = &dcmd->msg; | |
1533 | cmd = le16_to_cpu(msg->cmd); | |
1534 | param1 = le16_to_cpu(msg->param1); | |
1535 | param2 = le32_to_cpu(msg->param2); | |
1536 | ||
1537 | switch (cmd) { | |
1538 | case RPM_CMD_VERSION: | |
d31ad615 | 1539 | qcom_glink_receive_version(glink, param1, param2); |
835764dd BA |
1540 | break; |
1541 | case RPM_CMD_VERSION_ACK: | |
d31ad615 | 1542 | qcom_glink_receive_version_ack(glink, param1, param2); |
835764dd BA |
1543 | break; |
1544 | case RPM_CMD_OPEN: | |
1545 | qcom_glink_rx_open(glink, param1, msg->data); | |
1546 | break; | |
1547 | case RPM_CMD_CLOSE: | |
1548 | qcom_glink_rx_close(glink, param1); | |
1549 | break; | |
1550 | case RPM_CMD_CLOSE_ACK: | |
1551 | qcom_glink_rx_close_ack(glink, param1); | |
1552 | break; | |
933b45da S |
1553 | case RPM_CMD_RX_INTENT_REQ: |
1554 | qcom_glink_handle_intent_req(glink, param1, param2); | |
1555 | break; | |
835764dd BA |
1556 | default: |
1557 | WARN(1, "Unknown defer object %d\n", cmd); | |
1558 | break; | |
1559 | } | |
1560 | ||
1561 | kfree(dcmd); | |
1562 | } | |
1563 | } | |
1564 | ||
278bcb73 BA |
1565 | static void qcom_glink_cancel_rx_work(struct qcom_glink *glink) |
1566 | { | |
1567 | struct glink_defer_cmd *dcmd; | |
1568 | struct glink_defer_cmd *tmp; | |
1569 | ||
1570 | /* cancel any pending deferred rx_work */ | |
1571 | cancel_work_sync(&glink->rx_work); | |
1572 | ||
1573 | list_for_each_entry_safe(dcmd, tmp, &glink->rx_queue, node) | |
1574 | kfree(dcmd); | |
1575 | } | |
1576 | ||
835764dd | 1577 | struct qcom_glink *qcom_glink_native_probe(struct device *dev, |
d31ad615 | 1578 | unsigned long features, |
835764dd | 1579 | struct qcom_glink_pipe *rx, |
933b45da S |
1580 | struct qcom_glink_pipe *tx, |
1581 | bool intentless) | |
835764dd BA |
1582 | { |
1583 | int irq; | |
1584 | int ret; | |
1585 | struct qcom_glink *glink; | |
1586 | ||
1587 | glink = devm_kzalloc(dev, sizeof(*glink), GFP_KERNEL); | |
1588 | if (!glink) | |
1589 | return ERR_PTR(-ENOMEM); | |
1590 | ||
1591 | glink->dev = dev; | |
1592 | glink->tx_pipe = tx; | |
1593 | glink->rx_pipe = rx; | |
1594 | ||
d31ad615 | 1595 | glink->features = features; |
933b45da | 1596 | glink->intentless = intentless; |
d31ad615 | 1597 | |
29fc9b38 | 1598 | spin_lock_init(&glink->tx_lock); |
835764dd BA |
1599 | spin_lock_init(&glink->rx_lock); |
1600 | INIT_LIST_HEAD(&glink->rx_queue); | |
1601 | INIT_WORK(&glink->rx_work, qcom_glink_work); | |
1602 | ||
44f6df92 | 1603 | spin_lock_init(&glink->idr_lock); |
835764dd BA |
1604 | idr_init(&glink->lcids); |
1605 | idr_init(&glink->rcids); | |
1606 | ||
475452fc CL |
1607 | ret = of_property_read_string(dev->of_node, "label", &glink->name); |
1608 | if (ret < 0) | |
1609 | glink->name = dev->of_node->name; | |
1610 | ||
835764dd | 1611 | glink->mbox_client.dev = dev; |
38a9acb3 | 1612 | glink->mbox_client.knows_txdone = true; |
835764dd BA |
1613 | glink->mbox_chan = mbox_request_channel(&glink->mbox_client, 0); |
1614 | if (IS_ERR(glink->mbox_chan)) { | |
1615 | if (PTR_ERR(glink->mbox_chan) != -EPROBE_DEFER) | |
1616 | dev_err(dev, "failed to acquire IPC channel\n"); | |
1617 | return ERR_CAST(glink->mbox_chan); | |
1618 | } | |
1619 | ||
1620 | irq = of_irq_get(dev->of_node, 0); | |
1621 | ret = devm_request_irq(dev, irq, | |
1622 | qcom_glink_native_intr, | |
1623 | IRQF_NO_SUSPEND | IRQF_SHARED, | |
1624 | "glink-native", glink); | |
1625 | if (ret) { | |
1626 | dev_err(dev, "failed to request IRQ\n"); | |
1627 | return ERR_PTR(ret); | |
1628 | } | |
1629 | ||
1630 | glink->irq = irq; | |
1631 | ||
1632 | ret = qcom_glink_send_version(glink); | |
1633 | if (ret) | |
1634 | return ERR_PTR(ret); | |
1635 | ||
1636 | return glink; | |
1637 | } | |
f8ff9777 | 1638 | EXPORT_SYMBOL_GPL(qcom_glink_native_probe); |
835764dd BA |
1639 | |
1640 | static int qcom_glink_remove_device(struct device *dev, void *data) | |
1641 | { | |
1642 | device_unregister(dev); | |
1643 | ||
1644 | return 0; | |
1645 | } | |
1646 | ||
1647 | void qcom_glink_native_remove(struct qcom_glink *glink) | |
1648 | { | |
1649 | struct glink_channel *channel; | |
1650 | int cid; | |
1651 | int ret; | |
1652 | ||
1653 | disable_irq(glink->irq); | |
278bcb73 | 1654 | qcom_glink_cancel_rx_work(glink); |
835764dd BA |
1655 | |
1656 | ret = device_for_each_child(glink->dev, NULL, qcom_glink_remove_device); | |
1657 | if (ret) | |
1658 | dev_warn(glink->dev, "Can't remove GLINK devices: %d\n", ret); | |
1659 | ||
1660 | /* Release any defunct local channels, waiting for close-ack */ | |
1661 | idr_for_each_entry(&glink->lcids, channel, cid) | |
1662 | kref_put(&channel->refcount, qcom_glink_channel_release); | |
1663 | ||
b646293e CL |
1664 | /* Release any defunct local channels, waiting for close-req */ |
1665 | idr_for_each_entry(&glink->rcids, channel, cid) | |
1666 | kref_put(&channel->refcount, qcom_glink_channel_release); | |
1667 | ||
835764dd BA |
1668 | idr_destroy(&glink->lcids); |
1669 | idr_destroy(&glink->rcids); | |
76cf1105 | 1670 | mbox_free_channel(glink->mbox_chan); |
835764dd | 1671 | } |
f8ff9777 | 1672 | EXPORT_SYMBOL_GPL(qcom_glink_native_remove); |
caf989c3 BA |
1673 | |
1674 | void qcom_glink_native_unregister(struct qcom_glink *glink) | |
1675 | { | |
1676 | device_unregister(glink->dev); | |
1677 | } | |
f8ff9777 | 1678 | EXPORT_SYMBOL_GPL(qcom_glink_native_unregister); |
1e0d5615 BA |
1679 | |
1680 | MODULE_DESCRIPTION("Qualcomm GLINK driver"); | |
1681 | MODULE_LICENSE("GPL v2"); |