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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 | |
b16a37e1 AKN |
95 | * @tx_avail_notify: Waitqueue for pending tx tasks |
96 | * @sent_read_notify: flag to check cmd sent or not | |
835764dd BA |
97 | */ |
98 | struct qcom_glink { | |
99 | struct device *dev; | |
100 | ||
475452fc CL |
101 | const char *name; |
102 | ||
835764dd BA |
103 | struct mbox_client mbox_client; |
104 | struct mbox_chan *mbox_chan; | |
105 | ||
106 | struct qcom_glink_pipe *rx_pipe; | |
107 | struct qcom_glink_pipe *tx_pipe; | |
108 | ||
109 | int irq; | |
110 | ||
111 | struct work_struct rx_work; | |
112 | spinlock_t rx_lock; | |
113 | struct list_head rx_queue; | |
114 | ||
29fc9b38 | 115 | spinlock_t tx_lock; |
835764dd | 116 | |
44f6df92 | 117 | spinlock_t idr_lock; |
835764dd BA |
118 | struct idr lcids; |
119 | struct idr rcids; | |
d31ad615 S |
120 | unsigned long features; |
121 | ||
122 | bool intentless; | |
b16a37e1 AKN |
123 | wait_queue_head_t tx_avail_notify; |
124 | bool sent_read_notify; | |
835764dd BA |
125 | }; |
126 | ||
127 | enum { | |
128 | GLINK_STATE_CLOSED, | |
129 | GLINK_STATE_OPENING, | |
130 | GLINK_STATE_OPEN, | |
131 | GLINK_STATE_CLOSING, | |
132 | }; | |
133 | ||
134 | /** | |
135 | * struct glink_channel - internal representation of a channel | |
136 | * @rpdev: rpdev reference, only used for primary endpoints | |
137 | * @ept: rpmsg endpoint this channel is associated with | |
138 | * @glink: qcom_glink context handle | |
139 | * @refcount: refcount for the channel object | |
140 | * @recv_lock: guard for @ept.cb | |
141 | * @name: unique channel name/identifier | |
142 | * @lcid: channel id, in local space | |
143 | * @rcid: channel id, in remote space | |
dacbb35e | 144 | * @intent_lock: lock for protection of @liids, @riids |
933b45da | 145 | * @liids: idr of all local intents |
dacbb35e | 146 | * @riids: idr of all remote intents |
1d2ea36e S |
147 | * @intent_work: worker responsible for transmitting rx_done packets |
148 | * @done_intents: list of intents that needs to be announced rx_done | |
835764dd BA |
149 | * @buf: receive buffer, for gathering fragments |
150 | * @buf_offset: write offset in @buf | |
151 | * @buf_size: size of current @buf | |
152 | * @open_ack: completed once remote has acked the open-request | |
153 | * @open_req: completed once open-request has been received | |
27b9c5b6 S |
154 | * @intent_req_lock: Synchronises multiple intent requests |
155 | * @intent_req_result: Result of intent request | |
156 | * @intent_req_comp: Completion for intent_req signalling | |
835764dd BA |
157 | */ |
158 | struct glink_channel { | |
159 | struct rpmsg_endpoint ept; | |
160 | ||
161 | struct rpmsg_device *rpdev; | |
162 | struct qcom_glink *glink; | |
163 | ||
164 | struct kref refcount; | |
165 | ||
166 | spinlock_t recv_lock; | |
167 | ||
168 | char *name; | |
169 | unsigned int lcid; | |
170 | unsigned int rcid; | |
171 | ||
933b45da S |
172 | spinlock_t intent_lock; |
173 | struct idr liids; | |
dacbb35e | 174 | struct idr riids; |
1d2ea36e S |
175 | struct work_struct intent_work; |
176 | struct list_head done_intents; | |
933b45da | 177 | |
64f95f87 | 178 | struct glink_core_rx_intent *buf; |
835764dd BA |
179 | int buf_offset; |
180 | int buf_size; | |
181 | ||
182 | struct completion open_ack; | |
183 | struct completion open_req; | |
27b9c5b6 S |
184 | |
185 | struct mutex intent_req_lock; | |
186 | bool intent_req_result; | |
187 | struct completion intent_req_comp; | |
835764dd BA |
188 | }; |
189 | ||
190 | #define to_glink_channel(_ept) container_of(_ept, struct glink_channel, ept) | |
191 | ||
192 | static const struct rpmsg_endpoint_ops glink_endpoint_ops; | |
193 | ||
194 | #define RPM_CMD_VERSION 0 | |
195 | #define RPM_CMD_VERSION_ACK 1 | |
196 | #define RPM_CMD_OPEN 2 | |
197 | #define RPM_CMD_CLOSE 3 | |
198 | #define RPM_CMD_OPEN_ACK 4 | |
933b45da | 199 | #define RPM_CMD_INTENT 5 |
1d2ea36e | 200 | #define RPM_CMD_RX_DONE 6 |
933b45da S |
201 | #define RPM_CMD_RX_INTENT_REQ 7 |
202 | #define RPM_CMD_RX_INTENT_REQ_ACK 8 | |
835764dd BA |
203 | #define RPM_CMD_TX_DATA 9 |
204 | #define RPM_CMD_CLOSE_ACK 11 | |
205 | #define RPM_CMD_TX_DATA_CONT 12 | |
206 | #define RPM_CMD_READ_NOTIF 13 | |
1d2ea36e | 207 | #define RPM_CMD_RX_DONE_W_REUSE 14 |
835764dd BA |
208 | |
209 | #define GLINK_FEATURE_INTENTLESS BIT(1) | |
210 | ||
1d2ea36e S |
211 | static void qcom_glink_rx_done_work(struct work_struct *work); |
212 | ||
835764dd BA |
213 | static struct glink_channel *qcom_glink_alloc_channel(struct qcom_glink *glink, |
214 | const char *name) | |
215 | { | |
216 | struct glink_channel *channel; | |
217 | ||
218 | channel = kzalloc(sizeof(*channel), GFP_KERNEL); | |
219 | if (!channel) | |
220 | return ERR_PTR(-ENOMEM); | |
221 | ||
222 | /* Setup glink internal glink_channel data */ | |
223 | spin_lock_init(&channel->recv_lock); | |
933b45da | 224 | spin_lock_init(&channel->intent_lock); |
fb416f69 | 225 | mutex_init(&channel->intent_req_lock); |
1d2ea36e | 226 | |
835764dd BA |
227 | channel->glink = glink; |
228 | channel->name = kstrdup(name, GFP_KERNEL); | |
229 | ||
230 | init_completion(&channel->open_req); | |
231 | init_completion(&channel->open_ack); | |
2394facb | 232 | init_completion(&channel->intent_req_comp); |
835764dd | 233 | |
1d2ea36e S |
234 | INIT_LIST_HEAD(&channel->done_intents); |
235 | INIT_WORK(&channel->intent_work, qcom_glink_rx_done_work); | |
236 | ||
933b45da | 237 | idr_init(&channel->liids); |
dacbb35e | 238 | idr_init(&channel->riids); |
835764dd BA |
239 | kref_init(&channel->refcount); |
240 | ||
241 | return channel; | |
242 | } | |
243 | ||
244 | static void qcom_glink_channel_release(struct kref *ref) | |
245 | { | |
246 | struct glink_channel *channel = container_of(ref, struct glink_channel, | |
247 | refcount); | |
c3dadc19 | 248 | struct glink_core_rx_intent *intent; |
b85f6b60 | 249 | struct glink_core_rx_intent *tmp; |
933b45da | 250 | unsigned long flags; |
b85f6b60 | 251 | int iid; |
933b45da | 252 | |
c3dadc19 BA |
253 | /* cancel pending rx_done work */ |
254 | cancel_work_sync(&channel->intent_work); | |
255 | ||
933b45da | 256 | spin_lock_irqsave(&channel->intent_lock, flags); |
c3dadc19 BA |
257 | /* Free all non-reuse intents pending rx_done work */ |
258 | list_for_each_entry_safe(intent, tmp, &channel->done_intents, node) { | |
259 | if (!intent->reuse) { | |
260 | kfree(intent->data); | |
261 | kfree(intent); | |
262 | } | |
263 | } | |
264 | ||
b85f6b60 AKN |
265 | idr_for_each_entry(&channel->liids, tmp, iid) { |
266 | kfree(tmp->data); | |
267 | kfree(tmp); | |
268 | } | |
933b45da | 269 | idr_destroy(&channel->liids); |
b85f6b60 AKN |
270 | |
271 | idr_for_each_entry(&channel->riids, tmp, iid) | |
272 | kfree(tmp); | |
dacbb35e | 273 | idr_destroy(&channel->riids); |
933b45da | 274 | spin_unlock_irqrestore(&channel->intent_lock, flags); |
835764dd BA |
275 | |
276 | kfree(channel->name); | |
277 | kfree(channel); | |
278 | } | |
279 | ||
280 | static size_t qcom_glink_rx_avail(struct qcom_glink *glink) | |
281 | { | |
282 | return glink->rx_pipe->avail(glink->rx_pipe); | |
283 | } | |
284 | ||
285 | static void qcom_glink_rx_peak(struct qcom_glink *glink, | |
b88eee97 | 286 | void *data, unsigned int offset, size_t count) |
835764dd | 287 | { |
b88eee97 | 288 | glink->rx_pipe->peak(glink->rx_pipe, data, offset, count); |
835764dd BA |
289 | } |
290 | ||
291 | static void qcom_glink_rx_advance(struct qcom_glink *glink, size_t count) | |
292 | { | |
293 | glink->rx_pipe->advance(glink->rx_pipe, count); | |
294 | } | |
295 | ||
296 | static size_t qcom_glink_tx_avail(struct qcom_glink *glink) | |
297 | { | |
298 | return glink->tx_pipe->avail(glink->tx_pipe); | |
299 | } | |
300 | ||
301 | static void qcom_glink_tx_write(struct qcom_glink *glink, | |
302 | const void *hdr, size_t hlen, | |
303 | const void *data, size_t dlen) | |
304 | { | |
305 | glink->tx_pipe->write(glink->tx_pipe, hdr, hlen, data, dlen); | |
306 | } | |
307 | ||
b16a37e1 AKN |
308 | static void qcom_glink_send_read_notify(struct qcom_glink *glink) |
309 | { | |
310 | struct glink_msg msg; | |
311 | ||
312 | msg.cmd = cpu_to_le16(RPM_CMD_READ_NOTIF); | |
313 | msg.param1 = 0; | |
314 | msg.param2 = 0; | |
315 | ||
316 | qcom_glink_tx_write(glink, &msg, sizeof(msg), NULL, 0); | |
317 | ||
318 | mbox_send_message(glink->mbox_chan, NULL); | |
319 | mbox_client_txdone(glink->mbox_chan, 0); | |
320 | } | |
321 | ||
835764dd BA |
322 | static int qcom_glink_tx(struct qcom_glink *glink, |
323 | const void *hdr, size_t hlen, | |
324 | const void *data, size_t dlen, bool wait) | |
325 | { | |
326 | unsigned int tlen = hlen + dlen; | |
29fc9b38 BA |
327 | unsigned long flags; |
328 | int ret = 0; | |
835764dd BA |
329 | |
330 | /* Reject packets that are too big */ | |
331 | if (tlen >= glink->tx_pipe->length) | |
332 | return -EINVAL; | |
333 | ||
29fc9b38 | 334 | spin_lock_irqsave(&glink->tx_lock, flags); |
835764dd BA |
335 | |
336 | while (qcom_glink_tx_avail(glink) < tlen) { | |
337 | if (!wait) { | |
a7df9dfc | 338 | ret = -EAGAIN; |
835764dd BA |
339 | goto out; |
340 | } | |
341 | ||
b16a37e1 AKN |
342 | if (!glink->sent_read_notify) { |
343 | glink->sent_read_notify = true; | |
344 | qcom_glink_send_read_notify(glink); | |
345 | } | |
346 | ||
29fc9b38 BA |
347 | /* Wait without holding the tx_lock */ |
348 | spin_unlock_irqrestore(&glink->tx_lock, flags); | |
349 | ||
b16a37e1 AKN |
350 | wait_event_timeout(glink->tx_avail_notify, |
351 | qcom_glink_tx_avail(glink) >= tlen, 10 * HZ); | |
29fc9b38 BA |
352 | |
353 | spin_lock_irqsave(&glink->tx_lock, flags); | |
b16a37e1 AKN |
354 | |
355 | if (qcom_glink_tx_avail(glink) >= tlen) | |
356 | glink->sent_read_notify = false; | |
835764dd BA |
357 | } |
358 | ||
359 | qcom_glink_tx_write(glink, hdr, hlen, data, dlen); | |
360 | ||
361 | mbox_send_message(glink->mbox_chan, NULL); | |
362 | mbox_client_txdone(glink->mbox_chan, 0); | |
363 | ||
364 | out: | |
29fc9b38 | 365 | spin_unlock_irqrestore(&glink->tx_lock, flags); |
835764dd BA |
366 | |
367 | return ret; | |
368 | } | |
369 | ||
370 | static int qcom_glink_send_version(struct qcom_glink *glink) | |
371 | { | |
372 | struct glink_msg msg; | |
373 | ||
374 | msg.cmd = cpu_to_le16(RPM_CMD_VERSION); | |
d31ad615 S |
375 | msg.param1 = cpu_to_le16(GLINK_VERSION_1); |
376 | msg.param2 = cpu_to_le32(glink->features); | |
835764dd BA |
377 | |
378 | return qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); | |
379 | } | |
380 | ||
381 | static void qcom_glink_send_version_ack(struct qcom_glink *glink) | |
382 | { | |
383 | struct glink_msg msg; | |
384 | ||
385 | msg.cmd = cpu_to_le16(RPM_CMD_VERSION_ACK); | |
d31ad615 S |
386 | msg.param1 = cpu_to_le16(GLINK_VERSION_1); |
387 | msg.param2 = cpu_to_le32(glink->features); | |
835764dd BA |
388 | |
389 | qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); | |
390 | } | |
391 | ||
392 | static void qcom_glink_send_open_ack(struct qcom_glink *glink, | |
393 | struct glink_channel *channel) | |
394 | { | |
395 | struct glink_msg msg; | |
396 | ||
397 | msg.cmd = cpu_to_le16(RPM_CMD_OPEN_ACK); | |
398 | msg.param1 = cpu_to_le16(channel->rcid); | |
399 | msg.param2 = cpu_to_le32(0); | |
400 | ||
401 | qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); | |
402 | } | |
403 | ||
27b9c5b6 S |
404 | static void qcom_glink_handle_intent_req_ack(struct qcom_glink *glink, |
405 | unsigned int cid, bool granted) | |
406 | { | |
407 | struct glink_channel *channel; | |
408 | unsigned long flags; | |
409 | ||
410 | spin_lock_irqsave(&glink->idr_lock, flags); | |
411 | channel = idr_find(&glink->rcids, cid); | |
412 | spin_unlock_irqrestore(&glink->idr_lock, flags); | |
413 | if (!channel) { | |
414 | dev_err(glink->dev, "unable to find channel\n"); | |
415 | return; | |
416 | } | |
417 | ||
418 | channel->intent_req_result = granted; | |
419 | complete(&channel->intent_req_comp); | |
420 | } | |
421 | ||
835764dd BA |
422 | /** |
423 | * qcom_glink_send_open_req() - send a RPM_CMD_OPEN request to the remote | |
424 | * @glink: Ptr to the glink edge | |
425 | * @channel: Ptr to the channel that the open req is sent | |
426 | * | |
427 | * Allocates a local channel id and sends a RPM_CMD_OPEN message to the remote. | |
428 | * Will return with refcount held, regardless of outcome. | |
429 | * | |
631af6e0 | 430 | * Return: 0 on success, negative errno otherwise. |
835764dd BA |
431 | */ |
432 | static int qcom_glink_send_open_req(struct qcom_glink *glink, | |
433 | struct glink_channel *channel) | |
434 | { | |
435 | struct { | |
436 | struct glink_msg msg; | |
437 | u8 name[GLINK_NAME_SIZE]; | |
438 | } __packed req; | |
439 | int name_len = strlen(channel->name) + 1; | |
440 | int req_len = ALIGN(sizeof(req.msg) + name_len, 8); | |
441 | int ret; | |
44f6df92 | 442 | unsigned long flags; |
835764dd BA |
443 | |
444 | kref_get(&channel->refcount); | |
445 | ||
44f6df92 | 446 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd BA |
447 | ret = idr_alloc_cyclic(&glink->lcids, channel, |
448 | RPM_GLINK_CID_MIN, RPM_GLINK_CID_MAX, | |
44f6df92 S |
449 | GFP_ATOMIC); |
450 | spin_unlock_irqrestore(&glink->idr_lock, flags); | |
835764dd BA |
451 | if (ret < 0) |
452 | return ret; | |
453 | ||
454 | channel->lcid = ret; | |
455 | ||
456 | req.msg.cmd = cpu_to_le16(RPM_CMD_OPEN); | |
457 | req.msg.param1 = cpu_to_le16(channel->lcid); | |
458 | req.msg.param2 = cpu_to_le32(name_len); | |
459 | strcpy(req.name, channel->name); | |
460 | ||
461 | ret = qcom_glink_tx(glink, &req, req_len, NULL, 0, true); | |
462 | if (ret) | |
463 | goto remove_idr; | |
464 | ||
465 | return 0; | |
466 | ||
467 | remove_idr: | |
44f6df92 | 468 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd BA |
469 | idr_remove(&glink->lcids, channel->lcid); |
470 | channel->lcid = 0; | |
44f6df92 | 471 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
472 | |
473 | return ret; | |
474 | } | |
475 | ||
476 | static void qcom_glink_send_close_req(struct qcom_glink *glink, | |
477 | struct glink_channel *channel) | |
478 | { | |
479 | struct glink_msg req; | |
480 | ||
481 | req.cmd = cpu_to_le16(RPM_CMD_CLOSE); | |
482 | req.param1 = cpu_to_le16(channel->lcid); | |
483 | req.param2 = 0; | |
484 | ||
485 | qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true); | |
486 | } | |
487 | ||
488 | static void qcom_glink_send_close_ack(struct qcom_glink *glink, | |
489 | unsigned int rcid) | |
490 | { | |
491 | struct glink_msg req; | |
492 | ||
493 | req.cmd = cpu_to_le16(RPM_CMD_CLOSE_ACK); | |
494 | req.param1 = cpu_to_le16(rcid); | |
495 | req.param2 = 0; | |
496 | ||
497 | qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true); | |
498 | } | |
499 | ||
1d2ea36e S |
500 | static void qcom_glink_rx_done_work(struct work_struct *work) |
501 | { | |
502 | struct glink_channel *channel = container_of(work, struct glink_channel, | |
503 | intent_work); | |
504 | struct qcom_glink *glink = channel->glink; | |
505 | struct glink_core_rx_intent *intent, *tmp; | |
506 | struct { | |
507 | u16 id; | |
508 | u16 lcid; | |
509 | u32 liid; | |
510 | } __packed cmd; | |
511 | ||
512 | unsigned int cid = channel->lcid; | |
513 | unsigned int iid; | |
514 | bool reuse; | |
515 | unsigned long flags; | |
516 | ||
517 | spin_lock_irqsave(&channel->intent_lock, flags); | |
518 | list_for_each_entry_safe(intent, tmp, &channel->done_intents, node) { | |
519 | list_del(&intent->node); | |
520 | spin_unlock_irqrestore(&channel->intent_lock, flags); | |
521 | iid = intent->id; | |
522 | reuse = intent->reuse; | |
523 | ||
524 | cmd.id = reuse ? RPM_CMD_RX_DONE_W_REUSE : RPM_CMD_RX_DONE; | |
525 | cmd.lcid = cid; | |
526 | cmd.liid = iid; | |
527 | ||
528 | qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true); | |
529 | if (!reuse) { | |
530 | kfree(intent->data); | |
531 | kfree(intent); | |
532 | } | |
533 | spin_lock_irqsave(&channel->intent_lock, flags); | |
534 | } | |
535 | spin_unlock_irqrestore(&channel->intent_lock, flags); | |
536 | } | |
537 | ||
538 | static void qcom_glink_rx_done(struct qcom_glink *glink, | |
539 | struct glink_channel *channel, | |
540 | struct glink_core_rx_intent *intent) | |
541 | { | |
542 | /* We don't send RX_DONE to intentless systems */ | |
543 | if (glink->intentless) { | |
544 | kfree(intent->data); | |
545 | kfree(intent); | |
546 | return; | |
547 | } | |
548 | ||
549 | /* Take it off the tree of receive intents */ | |
550 | if (!intent->reuse) { | |
551 | spin_lock(&channel->intent_lock); | |
552 | idr_remove(&channel->liids, intent->id); | |
553 | spin_unlock(&channel->intent_lock); | |
554 | } | |
555 | ||
556 | /* Schedule the sending of a rx_done indication */ | |
557 | spin_lock(&channel->intent_lock); | |
558 | list_add_tail(&intent->node, &channel->done_intents); | |
559 | spin_unlock(&channel->intent_lock); | |
560 | ||
561 | schedule_work(&channel->intent_work); | |
562 | } | |
563 | ||
d31ad615 S |
564 | /** |
565 | * qcom_glink_receive_version() - receive version/features from remote system | |
566 | * | |
567 | * @glink: pointer to transport interface | |
6f0b9584 SK |
568 | * @version: remote version |
569 | * @features: remote features | |
d31ad615 S |
570 | * |
571 | * This function is called in response to a remote-initiated version/feature | |
572 | * negotiation sequence. | |
573 | */ | |
574 | static void qcom_glink_receive_version(struct qcom_glink *glink, | |
575 | u32 version, | |
576 | u32 features) | |
577 | { | |
578 | switch (version) { | |
579 | case 0: | |
580 | break; | |
581 | case GLINK_VERSION_1: | |
582 | glink->features &= features; | |
df561f66 | 583 | fallthrough; |
d31ad615 S |
584 | default: |
585 | qcom_glink_send_version_ack(glink); | |
586 | break; | |
587 | } | |
588 | } | |
589 | ||
590 | /** | |
591 | * qcom_glink_receive_version_ack() - receive negotiation ack from remote system | |
592 | * | |
593 | * @glink: pointer to transport interface | |
6f0b9584 SK |
594 | * @version: remote version response |
595 | * @features: remote features response | |
d31ad615 S |
596 | * |
597 | * This function is called in response to a local-initiated version/feature | |
598 | * negotiation sequence and is the counter-offer from the remote side based | |
599 | * upon the initial version and feature set requested. | |
600 | */ | |
601 | static void qcom_glink_receive_version_ack(struct qcom_glink *glink, | |
602 | u32 version, | |
603 | u32 features) | |
604 | { | |
605 | switch (version) { | |
606 | case 0: | |
607 | /* Version negotiation failed */ | |
608 | break; | |
609 | case GLINK_VERSION_1: | |
610 | if (features == glink->features) | |
611 | break; | |
612 | ||
613 | glink->features &= features; | |
df561f66 | 614 | fallthrough; |
d31ad615 S |
615 | default: |
616 | qcom_glink_send_version(glink); | |
617 | break; | |
618 | } | |
619 | } | |
620 | ||
933b45da S |
621 | /** |
622 | * qcom_glink_send_intent_req_ack() - convert an rx intent request ack cmd to | |
6f0b9584 | 623 | * wire format and transmit |
933b45da S |
624 | * @glink: The transport to transmit on. |
625 | * @channel: The glink channel | |
626 | * @granted: The request response to encode. | |
627 | * | |
628 | * Return: 0 on success or standard Linux error code. | |
629 | */ | |
630 | static int qcom_glink_send_intent_req_ack(struct qcom_glink *glink, | |
631 | struct glink_channel *channel, | |
632 | bool granted) | |
633 | { | |
634 | struct glink_msg msg; | |
635 | ||
636 | msg.cmd = cpu_to_le16(RPM_CMD_RX_INTENT_REQ_ACK); | |
637 | msg.param1 = cpu_to_le16(channel->lcid); | |
638 | msg.param2 = cpu_to_le32(granted); | |
639 | ||
640 | qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); | |
641 | ||
642 | return 0; | |
643 | } | |
644 | ||
645 | /** | |
646 | * qcom_glink_advertise_intent - convert an rx intent cmd to wire format and | |
647 | * transmit | |
648 | * @glink: The transport to transmit on. | |
649 | * @channel: The local channel | |
6f0b9584 | 650 | * @intent: The intent to pass on to remote. |
933b45da S |
651 | * |
652 | * Return: 0 on success or standard Linux error code. | |
653 | */ | |
654 | static int qcom_glink_advertise_intent(struct qcom_glink *glink, | |
655 | struct glink_channel *channel, | |
656 | struct glink_core_rx_intent *intent) | |
657 | { | |
658 | struct command { | |
427613ee SK |
659 | __le16 id; |
660 | __le16 lcid; | |
661 | __le32 count; | |
662 | __le32 size; | |
663 | __le32 liid; | |
933b45da S |
664 | } __packed; |
665 | struct command cmd; | |
666 | ||
667 | cmd.id = cpu_to_le16(RPM_CMD_INTENT); | |
668 | cmd.lcid = cpu_to_le16(channel->lcid); | |
669 | cmd.count = cpu_to_le32(1); | |
670 | cmd.size = cpu_to_le32(intent->size); | |
671 | cmd.liid = cpu_to_le32(intent->id); | |
672 | ||
673 | qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true); | |
674 | ||
675 | return 0; | |
676 | } | |
677 | ||
678 | static struct glink_core_rx_intent * | |
679 | qcom_glink_alloc_intent(struct qcom_glink *glink, | |
680 | struct glink_channel *channel, | |
681 | size_t size, | |
682 | bool reuseable) | |
683 | { | |
684 | struct glink_core_rx_intent *intent; | |
685 | int ret; | |
686 | unsigned long flags; | |
687 | ||
688 | intent = kzalloc(sizeof(*intent), GFP_KERNEL); | |
933b45da S |
689 | if (!intent) |
690 | return NULL; | |
691 | ||
692 | intent->data = kzalloc(size, GFP_KERNEL); | |
693 | if (!intent->data) | |
b775d158 | 694 | goto free_intent; |
933b45da S |
695 | |
696 | spin_lock_irqsave(&channel->intent_lock, flags); | |
697 | ret = idr_alloc_cyclic(&channel->liids, intent, 1, -1, GFP_ATOMIC); | |
698 | if (ret < 0) { | |
699 | spin_unlock_irqrestore(&channel->intent_lock, flags); | |
b775d158 | 700 | goto free_data; |
933b45da S |
701 | } |
702 | spin_unlock_irqrestore(&channel->intent_lock, flags); | |
703 | ||
704 | intent->id = ret; | |
705 | intent->size = size; | |
706 | intent->reuse = reuseable; | |
707 | ||
708 | return intent; | |
b775d158 DC |
709 | |
710 | free_data: | |
711 | kfree(intent->data); | |
712 | free_intent: | |
713 | kfree(intent); | |
714 | return NULL; | |
933b45da S |
715 | } |
716 | ||
88c6060f S |
717 | static void qcom_glink_handle_rx_done(struct qcom_glink *glink, |
718 | u32 cid, uint32_t iid, | |
719 | bool reuse) | |
720 | { | |
721 | struct glink_core_rx_intent *intent; | |
722 | struct glink_channel *channel; | |
723 | unsigned long flags; | |
724 | ||
725 | spin_lock_irqsave(&glink->idr_lock, flags); | |
726 | channel = idr_find(&glink->rcids, cid); | |
727 | spin_unlock_irqrestore(&glink->idr_lock, flags); | |
728 | if (!channel) { | |
729 | dev_err(glink->dev, "invalid channel id received\n"); | |
730 | return; | |
731 | } | |
732 | ||
733 | spin_lock_irqsave(&channel->intent_lock, flags); | |
734 | intent = idr_find(&channel->riids, iid); | |
735 | ||
736 | if (!intent) { | |
737 | spin_unlock_irqrestore(&channel->intent_lock, flags); | |
738 | dev_err(glink->dev, "invalid intent id received\n"); | |
739 | return; | |
740 | } | |
741 | ||
742 | intent->in_use = false; | |
743 | ||
744 | if (!reuse) { | |
745 | idr_remove(&channel->riids, intent->id); | |
746 | kfree(intent); | |
747 | } | |
748 | spin_unlock_irqrestore(&channel->intent_lock, flags); | |
749 | } | |
750 | ||
933b45da S |
751 | /** |
752 | * qcom_glink_handle_intent_req() - Receive a request for rx_intent | |
753 | * from remote side | |
6f0b9584 SK |
754 | * @glink: Pointer to the transport interface |
755 | * @cid: Remote channel ID | |
756 | * @size: size of the intent | |
933b45da S |
757 | * |
758 | * The function searches for the local channel to which the request for | |
759 | * rx_intent has arrived and allocates and notifies the remote back | |
760 | */ | |
761 | static void qcom_glink_handle_intent_req(struct qcom_glink *glink, | |
762 | u32 cid, size_t size) | |
763 | { | |
764 | struct glink_core_rx_intent *intent; | |
765 | struct glink_channel *channel; | |
766 | unsigned long flags; | |
767 | ||
768 | spin_lock_irqsave(&glink->idr_lock, flags); | |
769 | channel = idr_find(&glink->rcids, cid); | |
770 | spin_unlock_irqrestore(&glink->idr_lock, flags); | |
771 | ||
772 | if (!channel) { | |
773 | pr_err("%s channel not found for cid %d\n", __func__, cid); | |
774 | return; | |
775 | } | |
776 | ||
777 | intent = qcom_glink_alloc_intent(glink, channel, size, false); | |
778 | if (intent) | |
779 | qcom_glink_advertise_intent(glink, channel, intent); | |
780 | ||
781 | qcom_glink_send_intent_req_ack(glink, channel, !!intent); | |
782 | } | |
783 | ||
835764dd BA |
784 | static int qcom_glink_rx_defer(struct qcom_glink *glink, size_t extra) |
785 | { | |
786 | struct glink_defer_cmd *dcmd; | |
787 | ||
788 | extra = ALIGN(extra, 8); | |
789 | ||
790 | if (qcom_glink_rx_avail(glink) < sizeof(struct glink_msg) + extra) { | |
791 | dev_dbg(glink->dev, "Insufficient data in rx fifo"); | |
792 | return -ENXIO; | |
793 | } | |
794 | ||
18fc82d6 | 795 | dcmd = kzalloc(struct_size(dcmd, data, extra), GFP_ATOMIC); |
835764dd BA |
796 | if (!dcmd) |
797 | return -ENOMEM; | |
798 | ||
799 | INIT_LIST_HEAD(&dcmd->node); | |
800 | ||
b88eee97 | 801 | qcom_glink_rx_peak(glink, &dcmd->msg, 0, sizeof(dcmd->msg) + extra); |
835764dd BA |
802 | |
803 | spin_lock(&glink->rx_lock); | |
804 | list_add_tail(&dcmd->node, &glink->rx_queue); | |
805 | spin_unlock(&glink->rx_lock); | |
806 | ||
807 | schedule_work(&glink->rx_work); | |
808 | qcom_glink_rx_advance(glink, sizeof(dcmd->msg) + extra); | |
809 | ||
810 | return 0; | |
811 | } | |
812 | ||
813 | static int qcom_glink_rx_data(struct qcom_glink *glink, size_t avail) | |
814 | { | |
64f95f87 | 815 | struct glink_core_rx_intent *intent; |
835764dd BA |
816 | struct glink_channel *channel; |
817 | struct { | |
818 | struct glink_msg msg; | |
819 | __le32 chunk_size; | |
820 | __le32 left_size; | |
821 | } __packed hdr; | |
822 | unsigned int chunk_size; | |
823 | unsigned int left_size; | |
824 | unsigned int rcid; | |
64f95f87 S |
825 | unsigned int liid; |
826 | int ret = 0; | |
44f6df92 | 827 | unsigned long flags; |
835764dd BA |
828 | |
829 | if (avail < sizeof(hdr)) { | |
830 | dev_dbg(glink->dev, "Not enough data in fifo\n"); | |
831 | return -EAGAIN; | |
832 | } | |
833 | ||
b88eee97 | 834 | qcom_glink_rx_peak(glink, &hdr, 0, sizeof(hdr)); |
835764dd BA |
835 | chunk_size = le32_to_cpu(hdr.chunk_size); |
836 | left_size = le32_to_cpu(hdr.left_size); | |
837 | ||
838 | if (avail < sizeof(hdr) + chunk_size) { | |
839 | dev_dbg(glink->dev, "Payload not yet in fifo\n"); | |
840 | return -EAGAIN; | |
841 | } | |
842 | ||
835764dd | 843 | rcid = le16_to_cpu(hdr.msg.param1); |
44f6df92 | 844 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd | 845 | channel = idr_find(&glink->rcids, rcid); |
44f6df92 | 846 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
847 | if (!channel) { |
848 | dev_dbg(glink->dev, "Data on non-existing channel\n"); | |
849 | ||
850 | /* Drop the message */ | |
64f95f87 | 851 | goto advance_rx; |
835764dd BA |
852 | } |
853 | ||
64f95f87 S |
854 | if (glink->intentless) { |
855 | /* Might have an ongoing, fragmented, message to append */ | |
856 | if (!channel->buf) { | |
857 | intent = kzalloc(sizeof(*intent), GFP_ATOMIC); | |
858 | if (!intent) | |
859 | return -ENOMEM; | |
860 | ||
861 | intent->data = kmalloc(chunk_size + left_size, | |
862 | GFP_ATOMIC); | |
863 | if (!intent->data) { | |
864 | kfree(intent); | |
865 | return -ENOMEM; | |
866 | } | |
867 | ||
868 | intent->id = 0xbabababa; | |
869 | intent->size = chunk_size + left_size; | |
870 | intent->offset = 0; | |
871 | ||
872 | channel->buf = intent; | |
873 | } else { | |
874 | intent = channel->buf; | |
875 | } | |
876 | } else { | |
877 | liid = le32_to_cpu(hdr.msg.param2); | |
835764dd | 878 | |
64f95f87 S |
879 | spin_lock_irqsave(&channel->intent_lock, flags); |
880 | intent = idr_find(&channel->liids, liid); | |
881 | spin_unlock_irqrestore(&channel->intent_lock, flags); | |
835764dd | 882 | |
64f95f87 S |
883 | if (!intent) { |
884 | dev_err(glink->dev, | |
885 | "no intent found for channel %s intent %d", | |
886 | channel->name, liid); | |
26594c6b | 887 | ret = -ENOENT; |
64f95f87 S |
888 | goto advance_rx; |
889 | } | |
890 | } | |
835764dd | 891 | |
64f95f87 S |
892 | if (intent->size - intent->offset < chunk_size) { |
893 | dev_err(glink->dev, "Insufficient space in intent\n"); | |
835764dd BA |
894 | |
895 | /* The packet header lied, drop payload */ | |
64f95f87 | 896 | goto advance_rx; |
835764dd BA |
897 | } |
898 | ||
64f95f87 | 899 | qcom_glink_rx_peak(glink, intent->data + intent->offset, |
b88eee97 | 900 | sizeof(hdr), chunk_size); |
64f95f87 | 901 | intent->offset += chunk_size; |
835764dd BA |
902 | |
903 | /* Handle message when no fragments remain to be received */ | |
904 | if (!left_size) { | |
905 | spin_lock(&channel->recv_lock); | |
906 | if (channel->ept.cb) { | |
907 | channel->ept.cb(channel->ept.rpdev, | |
64f95f87 S |
908 | intent->data, |
909 | intent->offset, | |
835764dd BA |
910 | channel->ept.priv, |
911 | RPMSG_ADDR_ANY); | |
912 | } | |
913 | spin_unlock(&channel->recv_lock); | |
914 | ||
64f95f87 | 915 | intent->offset = 0; |
835764dd | 916 | channel->buf = NULL; |
1d2ea36e S |
917 | |
918 | qcom_glink_rx_done(glink, channel, intent); | |
835764dd BA |
919 | } |
920 | ||
64f95f87 | 921 | advance_rx: |
b88eee97 | 922 | qcom_glink_rx_advance(glink, ALIGN(sizeof(hdr) + chunk_size, 8)); |
835764dd | 923 | |
64f95f87 | 924 | return ret; |
835764dd BA |
925 | } |
926 | ||
dacbb35e S |
927 | static void qcom_glink_handle_intent(struct qcom_glink *glink, |
928 | unsigned int cid, | |
929 | unsigned int count, | |
930 | size_t avail) | |
931 | { | |
932 | struct glink_core_rx_intent *intent; | |
933 | struct glink_channel *channel; | |
934 | struct intent_pair { | |
935 | __le32 size; | |
936 | __le32 iid; | |
937 | }; | |
938 | ||
939 | struct { | |
940 | struct glink_msg msg; | |
941 | struct intent_pair intents[]; | |
942 | } __packed * msg; | |
943 | ||
61c65f47 | 944 | const size_t msglen = struct_size(msg, intents, count); |
dacbb35e S |
945 | int ret; |
946 | int i; | |
947 | unsigned long flags; | |
948 | ||
949 | if (avail < msglen) { | |
950 | dev_dbg(glink->dev, "Not enough data in fifo\n"); | |
951 | return; | |
952 | } | |
953 | ||
954 | spin_lock_irqsave(&glink->idr_lock, flags); | |
955 | channel = idr_find(&glink->rcids, cid); | |
956 | spin_unlock_irqrestore(&glink->idr_lock, flags); | |
957 | if (!channel) { | |
958 | dev_err(glink->dev, "intents for non-existing channel\n"); | |
959 | return; | |
960 | } | |
961 | ||
962 | msg = kmalloc(msglen, GFP_ATOMIC); | |
963 | if (!msg) | |
964 | return; | |
965 | ||
966 | qcom_glink_rx_peak(glink, msg, 0, msglen); | |
967 | ||
968 | for (i = 0; i < count; ++i) { | |
969 | intent = kzalloc(sizeof(*intent), GFP_ATOMIC); | |
970 | if (!intent) | |
971 | break; | |
972 | ||
973 | intent->id = le32_to_cpu(msg->intents[i].iid); | |
974 | intent->size = le32_to_cpu(msg->intents[i].size); | |
975 | ||
976 | spin_lock_irqsave(&channel->intent_lock, flags); | |
977 | ret = idr_alloc(&channel->riids, intent, | |
978 | intent->id, intent->id + 1, GFP_ATOMIC); | |
979 | spin_unlock_irqrestore(&channel->intent_lock, flags); | |
980 | ||
981 | if (ret < 0) | |
982 | dev_err(glink->dev, "failed to store remote intent\n"); | |
983 | } | |
984 | ||
985 | kfree(msg); | |
986 | qcom_glink_rx_advance(glink, ALIGN(msglen, 8)); | |
987 | } | |
988 | ||
835764dd BA |
989 | static int qcom_glink_rx_open_ack(struct qcom_glink *glink, unsigned int lcid) |
990 | { | |
991 | struct glink_channel *channel; | |
992 | ||
44f6df92 | 993 | spin_lock(&glink->idr_lock); |
835764dd | 994 | channel = idr_find(&glink->lcids, lcid); |
5f5423ff | 995 | spin_unlock(&glink->idr_lock); |
835764dd BA |
996 | if (!channel) { |
997 | dev_err(glink->dev, "Invalid open ack packet\n"); | |
998 | return -EINVAL; | |
999 | } | |
1000 | ||
4fcdaf6e | 1001 | complete_all(&channel->open_ack); |
835764dd BA |
1002 | |
1003 | return 0; | |
1004 | } | |
1005 | ||
1006 | static irqreturn_t qcom_glink_native_intr(int irq, void *data) | |
1007 | { | |
1008 | struct qcom_glink *glink = data; | |
1009 | struct glink_msg msg; | |
1010 | unsigned int param1; | |
1011 | unsigned int param2; | |
1012 | unsigned int avail; | |
1013 | unsigned int cmd; | |
ed43d098 | 1014 | int ret = 0; |
835764dd | 1015 | |
b16a37e1 AKN |
1016 | /* To wakeup any blocking writers */ |
1017 | wake_up_all(&glink->tx_avail_notify); | |
1018 | ||
835764dd BA |
1019 | for (;;) { |
1020 | avail = qcom_glink_rx_avail(glink); | |
1021 | if (avail < sizeof(msg)) | |
1022 | break; | |
1023 | ||
b88eee97 | 1024 | qcom_glink_rx_peak(glink, &msg, 0, sizeof(msg)); |
835764dd BA |
1025 | |
1026 | cmd = le16_to_cpu(msg.cmd); | |
1027 | param1 = le16_to_cpu(msg.param1); | |
1028 | param2 = le32_to_cpu(msg.param2); | |
1029 | ||
1030 | switch (cmd) { | |
1031 | case RPM_CMD_VERSION: | |
1032 | case RPM_CMD_VERSION_ACK: | |
1033 | case RPM_CMD_CLOSE: | |
1034 | case RPM_CMD_CLOSE_ACK: | |
933b45da | 1035 | case RPM_CMD_RX_INTENT_REQ: |
835764dd BA |
1036 | ret = qcom_glink_rx_defer(glink, 0); |
1037 | break; | |
1038 | case RPM_CMD_OPEN_ACK: | |
1039 | ret = qcom_glink_rx_open_ack(glink, param1); | |
1040 | qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); | |
1041 | break; | |
1042 | case RPM_CMD_OPEN: | |
1043 | ret = qcom_glink_rx_defer(glink, param2); | |
1044 | break; | |
1045 | case RPM_CMD_TX_DATA: | |
1046 | case RPM_CMD_TX_DATA_CONT: | |
1047 | ret = qcom_glink_rx_data(glink, avail); | |
1048 | break; | |
1049 | case RPM_CMD_READ_NOTIF: | |
1050 | qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); | |
1051 | ||
1052 | mbox_send_message(glink->mbox_chan, NULL); | |
1053 | mbox_client_txdone(glink->mbox_chan, 0); | |
835764dd | 1054 | break; |
dacbb35e S |
1055 | case RPM_CMD_INTENT: |
1056 | qcom_glink_handle_intent(glink, param1, param2, avail); | |
1057 | break; | |
88c6060f S |
1058 | case RPM_CMD_RX_DONE: |
1059 | qcom_glink_handle_rx_done(glink, param1, param2, false); | |
1060 | qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); | |
1061 | break; | |
1062 | case RPM_CMD_RX_DONE_W_REUSE: | |
1063 | qcom_glink_handle_rx_done(glink, param1, param2, true); | |
1064 | qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); | |
1065 | break; | |
27b9c5b6 S |
1066 | case RPM_CMD_RX_INTENT_REQ_ACK: |
1067 | qcom_glink_handle_intent_req_ack(glink, param1, param2); | |
1068 | qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); | |
1069 | break; | |
835764dd BA |
1070 | default: |
1071 | dev_err(glink->dev, "unhandled rx cmd: %d\n", cmd); | |
1072 | ret = -EINVAL; | |
1073 | break; | |
1074 | } | |
1075 | ||
1076 | if (ret) | |
1077 | break; | |
1078 | } | |
1079 | ||
1080 | return IRQ_HANDLED; | |
1081 | } | |
1082 | ||
1083 | /* Locally initiated rpmsg_create_ept */ | |
1084 | static struct glink_channel *qcom_glink_create_local(struct qcom_glink *glink, | |
1085 | const char *name) | |
1086 | { | |
1087 | struct glink_channel *channel; | |
1088 | int ret; | |
44f6df92 | 1089 | unsigned long flags; |
835764dd BA |
1090 | |
1091 | channel = qcom_glink_alloc_channel(glink, name); | |
1092 | if (IS_ERR(channel)) | |
1093 | return ERR_CAST(channel); | |
1094 | ||
1095 | ret = qcom_glink_send_open_req(glink, channel); | |
1096 | if (ret) | |
1097 | goto release_channel; | |
1098 | ||
1099 | ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ); | |
1100 | if (!ret) | |
1101 | goto err_timeout; | |
1102 | ||
1103 | ret = wait_for_completion_timeout(&channel->open_req, 5 * HZ); | |
1104 | if (!ret) | |
1105 | goto err_timeout; | |
1106 | ||
1107 | qcom_glink_send_open_ack(glink, channel); | |
1108 | ||
1109 | return channel; | |
1110 | ||
1111 | err_timeout: | |
1112 | /* qcom_glink_send_open_req() did register the channel in lcids*/ | |
44f6df92 | 1113 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd | 1114 | idr_remove(&glink->lcids, channel->lcid); |
44f6df92 | 1115 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1116 | |
1117 | release_channel: | |
1118 | /* Release qcom_glink_send_open_req() reference */ | |
1119 | kref_put(&channel->refcount, qcom_glink_channel_release); | |
1120 | /* Release qcom_glink_alloc_channel() reference */ | |
1121 | kref_put(&channel->refcount, qcom_glink_channel_release); | |
1122 | ||
1123 | return ERR_PTR(-ETIMEDOUT); | |
1124 | } | |
1125 | ||
1126 | /* Remote initiated rpmsg_create_ept */ | |
1127 | static int qcom_glink_create_remote(struct qcom_glink *glink, | |
1128 | struct glink_channel *channel) | |
1129 | { | |
1130 | int ret; | |
1131 | ||
1132 | qcom_glink_send_open_ack(glink, channel); | |
1133 | ||
1134 | ret = qcom_glink_send_open_req(glink, channel); | |
1135 | if (ret) | |
1136 | goto close_link; | |
1137 | ||
1138 | ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ); | |
1139 | if (!ret) { | |
1140 | ret = -ETIMEDOUT; | |
1141 | goto close_link; | |
1142 | } | |
1143 | ||
1144 | return 0; | |
1145 | ||
1146 | close_link: | |
1147 | /* | |
1148 | * Send a close request to "undo" our open-ack. The close-ack will | |
ac74ea01 AKN |
1149 | * release qcom_glink_send_open_req() reference and the last reference |
1150 | * will be relesed after receiving remote_close or transport unregister | |
1151 | * by calling qcom_glink_native_remove(). | |
835764dd BA |
1152 | */ |
1153 | qcom_glink_send_close_req(glink, channel); | |
1154 | ||
835764dd BA |
1155 | return ret; |
1156 | } | |
1157 | ||
1158 | static struct rpmsg_endpoint *qcom_glink_create_ept(struct rpmsg_device *rpdev, | |
1159 | rpmsg_rx_cb_t cb, | |
1160 | void *priv, | |
1161 | struct rpmsg_channel_info | |
1162 | chinfo) | |
1163 | { | |
1164 | struct glink_channel *parent = to_glink_channel(rpdev->ept); | |
1165 | struct glink_channel *channel; | |
1166 | struct qcom_glink *glink = parent->glink; | |
1167 | struct rpmsg_endpoint *ept; | |
1168 | const char *name = chinfo.name; | |
1169 | int cid; | |
1170 | int ret; | |
44f6df92 | 1171 | unsigned long flags; |
835764dd | 1172 | |
44f6df92 | 1173 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd BA |
1174 | idr_for_each_entry(&glink->rcids, channel, cid) { |
1175 | if (!strcmp(channel->name, name)) | |
1176 | break; | |
1177 | } | |
44f6df92 | 1178 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1179 | |
1180 | if (!channel) { | |
1181 | channel = qcom_glink_create_local(glink, name); | |
1182 | if (IS_ERR(channel)) | |
1183 | return NULL; | |
1184 | } else { | |
1185 | ret = qcom_glink_create_remote(glink, channel); | |
1186 | if (ret) | |
1187 | return NULL; | |
1188 | } | |
1189 | ||
1190 | ept = &channel->ept; | |
1191 | ept->rpdev = rpdev; | |
1192 | ept->cb = cb; | |
1193 | ept->priv = priv; | |
1194 | ept->ops = &glink_endpoint_ops; | |
1195 | ||
1196 | return ept; | |
1197 | } | |
1198 | ||
6bf68cbd S |
1199 | static int qcom_glink_announce_create(struct rpmsg_device *rpdev) |
1200 | { | |
1201 | struct glink_channel *channel = to_glink_channel(rpdev->ept); | |
07389377 | 1202 | struct device_node *np = rpdev->dev.of_node; |
6bf68cbd | 1203 | struct qcom_glink *glink = channel->glink; |
07389377 CL |
1204 | struct glink_core_rx_intent *intent; |
1205 | const struct property *prop = NULL; | |
1206 | __be32 defaults[] = { cpu_to_be32(SZ_1K), cpu_to_be32(5) }; | |
1207 | int num_intents; | |
1208 | int num_groups = 1; | |
1209 | __be32 *val = defaults; | |
1210 | int size; | |
1211 | ||
4fcdaf6e | 1212 | if (glink->intentless || !completion_done(&channel->open_ack)) |
07389377 CL |
1213 | return 0; |
1214 | ||
1215 | prop = of_find_property(np, "qcom,intents", NULL); | |
1216 | if (prop) { | |
1217 | val = prop->value; | |
1218 | num_groups = prop->length / sizeof(u32) / 2; | |
1219 | } | |
6bf68cbd S |
1220 | |
1221 | /* Channel is now open, advertise base set of intents */ | |
07389377 CL |
1222 | while (num_groups--) { |
1223 | size = be32_to_cpup(val++); | |
1224 | num_intents = be32_to_cpup(val++); | |
1225 | while (num_intents--) { | |
1226 | intent = qcom_glink_alloc_intent(glink, channel, size, | |
1227 | true); | |
1228 | if (!intent) | |
1229 | break; | |
6bf68cbd | 1230 | |
07389377 CL |
1231 | qcom_glink_advertise_intent(glink, channel, intent); |
1232 | } | |
6bf68cbd | 1233 | } |
6bf68cbd S |
1234 | return 0; |
1235 | } | |
1236 | ||
835764dd BA |
1237 | static void qcom_glink_destroy_ept(struct rpmsg_endpoint *ept) |
1238 | { | |
1239 | struct glink_channel *channel = to_glink_channel(ept); | |
1240 | struct qcom_glink *glink = channel->glink; | |
1241 | unsigned long flags; | |
1242 | ||
1243 | spin_lock_irqsave(&channel->recv_lock, flags); | |
1244 | channel->ept.cb = NULL; | |
1245 | spin_unlock_irqrestore(&channel->recv_lock, flags); | |
1246 | ||
1247 | /* Decouple the potential rpdev from the channel */ | |
1248 | channel->rpdev = NULL; | |
1249 | ||
1250 | qcom_glink_send_close_req(glink, channel); | |
1251 | } | |
1252 | ||
27b9c5b6 S |
1253 | static int qcom_glink_request_intent(struct qcom_glink *glink, |
1254 | struct glink_channel *channel, | |
1255 | size_t size) | |
1256 | { | |
1257 | struct { | |
1258 | u16 id; | |
1259 | u16 cid; | |
1260 | u32 size; | |
1261 | } __packed cmd; | |
1262 | ||
1263 | int ret; | |
1264 | ||
1265 | mutex_lock(&channel->intent_req_lock); | |
1266 | ||
1267 | reinit_completion(&channel->intent_req_comp); | |
1268 | ||
1269 | cmd.id = RPM_CMD_RX_INTENT_REQ; | |
1270 | cmd.cid = channel->lcid; | |
1271 | cmd.size = size; | |
1272 | ||
1273 | ret = qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true); | |
1274 | if (ret) | |
0a7480bd | 1275 | goto unlock; |
27b9c5b6 S |
1276 | |
1277 | ret = wait_for_completion_timeout(&channel->intent_req_comp, 10 * HZ); | |
1278 | if (!ret) { | |
1279 | dev_err(glink->dev, "intent request timed out\n"); | |
1280 | ret = -ETIMEDOUT; | |
1281 | } else { | |
1282 | ret = channel->intent_req_result ? 0 : -ECANCELED; | |
1283 | } | |
1284 | ||
0a7480bd | 1285 | unlock: |
27b9c5b6 S |
1286 | mutex_unlock(&channel->intent_req_lock); |
1287 | return ret; | |
1288 | } | |
1289 | ||
835764dd BA |
1290 | static int __qcom_glink_send(struct glink_channel *channel, |
1291 | void *data, int len, bool wait) | |
1292 | { | |
1293 | struct qcom_glink *glink = channel->glink; | |
11cb45a7 S |
1294 | struct glink_core_rx_intent *intent = NULL; |
1295 | struct glink_core_rx_intent *tmp; | |
1296 | int iid = 0; | |
835764dd BA |
1297 | struct { |
1298 | struct glink_msg msg; | |
1299 | __le32 chunk_size; | |
1300 | __le32 left_size; | |
1301 | } __packed req; | |
11cb45a7 S |
1302 | int ret; |
1303 | unsigned long flags; | |
8956927f AKN |
1304 | int chunk_size = len; |
1305 | int left_size = 0; | |
11cb45a7 S |
1306 | |
1307 | if (!glink->intentless) { | |
27b9c5b6 | 1308 | while (!intent) { |
11cb45a7 S |
1309 | spin_lock_irqsave(&channel->intent_lock, flags); |
1310 | idr_for_each_entry(&channel->riids, tmp, iid) { | |
1311 | if (tmp->size >= len && !tmp->in_use) { | |
29031870 CL |
1312 | if (!intent) |
1313 | intent = tmp; | |
1314 | else if (intent->size > tmp->size) | |
1315 | intent = tmp; | |
1316 | if (intent->size == len) | |
1317 | break; | |
11cb45a7 S |
1318 | } |
1319 | } | |
29031870 CL |
1320 | if (intent) |
1321 | intent->in_use = true; | |
11cb45a7 S |
1322 | spin_unlock_irqrestore(&channel->intent_lock, flags); |
1323 | ||
1324 | /* We found an available intent */ | |
27b9c5b6 S |
1325 | if (intent) |
1326 | break; | |
1327 | ||
1328 | if (!wait) | |
11cb45a7 | 1329 | return -EBUSY; |
27b9c5b6 S |
1330 | |
1331 | ret = qcom_glink_request_intent(glink, channel, len); | |
1332 | if (ret < 0) | |
1333 | return ret; | |
11cb45a7 S |
1334 | } |
1335 | ||
1336 | iid = intent->id; | |
1337 | } | |
835764dd | 1338 | |
8956927f AKN |
1339 | if (wait && chunk_size > SZ_8K) { |
1340 | chunk_size = SZ_8K; | |
1341 | left_size = len - chunk_size; | |
1342 | } | |
835764dd BA |
1343 | req.msg.cmd = cpu_to_le16(RPM_CMD_TX_DATA); |
1344 | req.msg.param1 = cpu_to_le16(channel->lcid); | |
11cb45a7 | 1345 | req.msg.param2 = cpu_to_le32(iid); |
8956927f AKN |
1346 | req.chunk_size = cpu_to_le32(chunk_size); |
1347 | req.left_size = cpu_to_le32(left_size); | |
835764dd | 1348 | |
8956927f | 1349 | ret = qcom_glink_tx(glink, &req, sizeof(req), data, chunk_size, wait); |
11cb45a7 S |
1350 | |
1351 | /* Mark intent available if we failed */ | |
8956927f | 1352 | if (ret && intent) { |
11cb45a7 | 1353 | intent->in_use = false; |
8956927f AKN |
1354 | return ret; |
1355 | } | |
11cb45a7 | 1356 | |
8956927f AKN |
1357 | while (left_size > 0) { |
1358 | data = (void *)((char *)data + chunk_size); | |
1359 | chunk_size = left_size; | |
1360 | if (chunk_size > SZ_8K) | |
1361 | chunk_size = SZ_8K; | |
1362 | left_size -= chunk_size; | |
1363 | ||
1364 | req.msg.cmd = cpu_to_le16(RPM_CMD_TX_DATA_CONT); | |
1365 | req.msg.param1 = cpu_to_le16(channel->lcid); | |
1366 | req.msg.param2 = cpu_to_le32(iid); | |
1367 | req.chunk_size = cpu_to_le32(chunk_size); | |
1368 | req.left_size = cpu_to_le32(left_size); | |
1369 | ||
1370 | ret = qcom_glink_tx(glink, &req, sizeof(req), data, | |
1371 | chunk_size, wait); | |
1372 | ||
1373 | /* Mark intent available if we failed */ | |
1374 | if (ret && intent) { | |
1375 | intent->in_use = false; | |
1376 | break; | |
1377 | } | |
1378 | } | |
11cb45a7 | 1379 | return ret; |
835764dd BA |
1380 | } |
1381 | ||
1382 | static int qcom_glink_send(struct rpmsg_endpoint *ept, void *data, int len) | |
1383 | { | |
1384 | struct glink_channel *channel = to_glink_channel(ept); | |
1385 | ||
1386 | return __qcom_glink_send(channel, data, len, true); | |
1387 | } | |
1388 | ||
1389 | static int qcom_glink_trysend(struct rpmsg_endpoint *ept, void *data, int len) | |
1390 | { | |
1391 | struct glink_channel *channel = to_glink_channel(ept); | |
1392 | ||
1393 | return __qcom_glink_send(channel, data, len, false); | |
1394 | } | |
1395 | ||
b4ce7e2e AP |
1396 | static int qcom_glink_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst) |
1397 | { | |
1398 | struct glink_channel *channel = to_glink_channel(ept); | |
1399 | ||
1400 | return __qcom_glink_send(channel, data, len, true); | |
1401 | } | |
1402 | ||
1403 | static int qcom_glink_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst) | |
1404 | { | |
1405 | struct glink_channel *channel = to_glink_channel(ept); | |
1406 | ||
1407 | return __qcom_glink_send(channel, data, len, false); | |
1408 | } | |
1409 | ||
835764dd BA |
1410 | /* |
1411 | * Finds the device_node for the glink child interested in this channel. | |
1412 | */ | |
1413 | static struct device_node *qcom_glink_match_channel(struct device_node *node, | |
1414 | const char *channel) | |
1415 | { | |
1416 | struct device_node *child; | |
1417 | const char *name; | |
1418 | const char *key; | |
1419 | int ret; | |
1420 | ||
1421 | for_each_available_child_of_node(node, child) { | |
1422 | key = "qcom,glink-channels"; | |
1423 | ret = of_property_read_string(child, key, &name); | |
1424 | if (ret) | |
1425 | continue; | |
1426 | ||
1427 | if (strcmp(name, channel) == 0) | |
1428 | return child; | |
1429 | } | |
1430 | ||
1431 | return NULL; | |
1432 | } | |
1433 | ||
1434 | static const struct rpmsg_device_ops glink_device_ops = { | |
1435 | .create_ept = qcom_glink_create_ept, | |
6bf68cbd | 1436 | .announce_create = qcom_glink_announce_create, |
835764dd BA |
1437 | }; |
1438 | ||
1439 | static const struct rpmsg_endpoint_ops glink_endpoint_ops = { | |
1440 | .destroy_ept = qcom_glink_destroy_ept, | |
1441 | .send = qcom_glink_send, | |
b4ce7e2e | 1442 | .sendto = qcom_glink_sendto, |
835764dd | 1443 | .trysend = qcom_glink_trysend, |
b4ce7e2e | 1444 | .trysendto = qcom_glink_trysendto, |
835764dd BA |
1445 | }; |
1446 | ||
1447 | static void qcom_glink_rpdev_release(struct device *dev) | |
1448 | { | |
1449 | struct rpmsg_device *rpdev = to_rpmsg_device(dev); | |
835764dd | 1450 | |
835764dd BA |
1451 | kfree(rpdev); |
1452 | } | |
1453 | ||
1454 | static int qcom_glink_rx_open(struct qcom_glink *glink, unsigned int rcid, | |
1455 | char *name) | |
1456 | { | |
1457 | struct glink_channel *channel; | |
1458 | struct rpmsg_device *rpdev; | |
1459 | bool create_device = false; | |
1460 | struct device_node *node; | |
1461 | int lcid; | |
1462 | int ret; | |
44f6df92 | 1463 | unsigned long flags; |
835764dd | 1464 | |
44f6df92 | 1465 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd BA |
1466 | idr_for_each_entry(&glink->lcids, channel, lcid) { |
1467 | if (!strcmp(channel->name, name)) | |
1468 | break; | |
1469 | } | |
44f6df92 | 1470 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1471 | |
1472 | if (!channel) { | |
1473 | channel = qcom_glink_alloc_channel(glink, name); | |
1474 | if (IS_ERR(channel)) | |
1475 | return PTR_ERR(channel); | |
1476 | ||
1477 | /* The opening dance was initiated by the remote */ | |
1478 | create_device = true; | |
1479 | } | |
1480 | ||
44f6df92 S |
1481 | spin_lock_irqsave(&glink->idr_lock, flags); |
1482 | ret = idr_alloc(&glink->rcids, channel, rcid, rcid + 1, GFP_ATOMIC); | |
835764dd BA |
1483 | if (ret < 0) { |
1484 | dev_err(glink->dev, "Unable to insert channel into rcid list\n"); | |
44f6df92 | 1485 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1486 | goto free_channel; |
1487 | } | |
1488 | channel->rcid = ret; | |
44f6df92 | 1489 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd | 1490 | |
4fcdaf6e | 1491 | complete_all(&channel->open_req); |
835764dd BA |
1492 | |
1493 | if (create_device) { | |
1494 | rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL); | |
1495 | if (!rpdev) { | |
1496 | ret = -ENOMEM; | |
1497 | goto rcid_remove; | |
1498 | } | |
1499 | ||
1500 | rpdev->ept = &channel->ept; | |
08de420a | 1501 | strscpy_pad(rpdev->id.name, name, RPMSG_NAME_SIZE); |
835764dd BA |
1502 | rpdev->src = RPMSG_ADDR_ANY; |
1503 | rpdev->dst = RPMSG_ADDR_ANY; | |
1504 | rpdev->ops = &glink_device_ops; | |
1505 | ||
1506 | node = qcom_glink_match_channel(glink->dev->of_node, name); | |
1507 | rpdev->dev.of_node = node; | |
1508 | rpdev->dev.parent = glink->dev; | |
1509 | rpdev->dev.release = qcom_glink_rpdev_release; | |
1510 | ||
1511 | ret = rpmsg_register_device(rpdev); | |
1512 | if (ret) | |
f7e71498 | 1513 | goto rcid_remove; |
835764dd BA |
1514 | |
1515 | channel->rpdev = rpdev; | |
1516 | } | |
1517 | ||
1518 | return 0; | |
1519 | ||
835764dd | 1520 | rcid_remove: |
44f6df92 | 1521 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd BA |
1522 | idr_remove(&glink->rcids, channel->rcid); |
1523 | channel->rcid = 0; | |
44f6df92 | 1524 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1525 | free_channel: |
1526 | /* Release the reference, iff we took it */ | |
1527 | if (create_device) | |
1528 | kref_put(&channel->refcount, qcom_glink_channel_release); | |
1529 | ||
1530 | return ret; | |
1531 | } | |
1532 | ||
1533 | static void qcom_glink_rx_close(struct qcom_glink *glink, unsigned int rcid) | |
1534 | { | |
1535 | struct rpmsg_channel_info chinfo; | |
1536 | struct glink_channel *channel; | |
44f6df92 | 1537 | unsigned long flags; |
835764dd | 1538 | |
44f6df92 | 1539 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd | 1540 | channel = idr_find(&glink->rcids, rcid); |
44f6df92 | 1541 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1542 | if (WARN(!channel, "close request on unknown channel\n")) |
1543 | return; | |
1544 | ||
1d2ea36e S |
1545 | /* cancel pending rx_done work */ |
1546 | cancel_work_sync(&channel->intent_work); | |
1547 | ||
835764dd | 1548 | if (channel->rpdev) { |
766279a8 | 1549 | strscpy_pad(chinfo.name, channel->name, sizeof(chinfo.name)); |
835764dd BA |
1550 | chinfo.src = RPMSG_ADDR_ANY; |
1551 | chinfo.dst = RPMSG_ADDR_ANY; | |
1552 | ||
1553 | rpmsg_unregister_device(glink->dev, &chinfo); | |
1554 | } | |
c7c182d4 | 1555 | channel->rpdev = NULL; |
835764dd BA |
1556 | |
1557 | qcom_glink_send_close_ack(glink, channel->rcid); | |
1558 | ||
44f6df92 | 1559 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd BA |
1560 | idr_remove(&glink->rcids, channel->rcid); |
1561 | channel->rcid = 0; | |
44f6df92 | 1562 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd BA |
1563 | |
1564 | kref_put(&channel->refcount, qcom_glink_channel_release); | |
1565 | } | |
1566 | ||
1567 | static void qcom_glink_rx_close_ack(struct qcom_glink *glink, unsigned int lcid) | |
1568 | { | |
c7c182d4 | 1569 | struct rpmsg_channel_info chinfo; |
835764dd | 1570 | struct glink_channel *channel; |
44f6df92 | 1571 | unsigned long flags; |
835764dd | 1572 | |
b16a37e1 AKN |
1573 | /* To wakeup any blocking writers */ |
1574 | wake_up_all(&glink->tx_avail_notify); | |
1575 | ||
44f6df92 | 1576 | spin_lock_irqsave(&glink->idr_lock, flags); |
835764dd | 1577 | channel = idr_find(&glink->lcids, lcid); |
44f6df92 S |
1578 | if (WARN(!channel, "close ack on unknown channel\n")) { |
1579 | spin_unlock_irqrestore(&glink->idr_lock, flags); | |
835764dd | 1580 | return; |
44f6df92 | 1581 | } |
835764dd | 1582 | |
835764dd BA |
1583 | idr_remove(&glink->lcids, channel->lcid); |
1584 | channel->lcid = 0; | |
44f6df92 | 1585 | spin_unlock_irqrestore(&glink->idr_lock, flags); |
835764dd | 1586 | |
c7c182d4 AKN |
1587 | /* Decouple the potential rpdev from the channel */ |
1588 | if (channel->rpdev) { | |
1589 | strscpy(chinfo.name, channel->name, sizeof(chinfo.name)); | |
1590 | chinfo.src = RPMSG_ADDR_ANY; | |
1591 | chinfo.dst = RPMSG_ADDR_ANY; | |
1592 | ||
1593 | rpmsg_unregister_device(glink->dev, &chinfo); | |
1594 | } | |
1595 | channel->rpdev = NULL; | |
1596 | ||
835764dd BA |
1597 | kref_put(&channel->refcount, qcom_glink_channel_release); |
1598 | } | |
1599 | ||
1600 | static void qcom_glink_work(struct work_struct *work) | |
1601 | { | |
1602 | struct qcom_glink *glink = container_of(work, struct qcom_glink, | |
1603 | rx_work); | |
1604 | struct glink_defer_cmd *dcmd; | |
1605 | struct glink_msg *msg; | |
1606 | unsigned long flags; | |
1607 | unsigned int param1; | |
1608 | unsigned int param2; | |
1609 | unsigned int cmd; | |
1610 | ||
1611 | for (;;) { | |
1612 | spin_lock_irqsave(&glink->rx_lock, flags); | |
1613 | if (list_empty(&glink->rx_queue)) { | |
1614 | spin_unlock_irqrestore(&glink->rx_lock, flags); | |
1615 | break; | |
1616 | } | |
1617 | dcmd = list_first_entry(&glink->rx_queue, | |
1618 | struct glink_defer_cmd, node); | |
1619 | list_del(&dcmd->node); | |
1620 | spin_unlock_irqrestore(&glink->rx_lock, flags); | |
1621 | ||
1622 | msg = &dcmd->msg; | |
1623 | cmd = le16_to_cpu(msg->cmd); | |
1624 | param1 = le16_to_cpu(msg->param1); | |
1625 | param2 = le32_to_cpu(msg->param2); | |
1626 | ||
1627 | switch (cmd) { | |
1628 | case RPM_CMD_VERSION: | |
d31ad615 | 1629 | qcom_glink_receive_version(glink, param1, param2); |
835764dd BA |
1630 | break; |
1631 | case RPM_CMD_VERSION_ACK: | |
d31ad615 | 1632 | qcom_glink_receive_version_ack(glink, param1, param2); |
835764dd BA |
1633 | break; |
1634 | case RPM_CMD_OPEN: | |
1635 | qcom_glink_rx_open(glink, param1, msg->data); | |
1636 | break; | |
1637 | case RPM_CMD_CLOSE: | |
1638 | qcom_glink_rx_close(glink, param1); | |
1639 | break; | |
1640 | case RPM_CMD_CLOSE_ACK: | |
1641 | qcom_glink_rx_close_ack(glink, param1); | |
1642 | break; | |
933b45da S |
1643 | case RPM_CMD_RX_INTENT_REQ: |
1644 | qcom_glink_handle_intent_req(glink, param1, param2); | |
1645 | break; | |
835764dd BA |
1646 | default: |
1647 | WARN(1, "Unknown defer object %d\n", cmd); | |
1648 | break; | |
1649 | } | |
1650 | ||
1651 | kfree(dcmd); | |
1652 | } | |
1653 | } | |
1654 | ||
278bcb73 BA |
1655 | static void qcom_glink_cancel_rx_work(struct qcom_glink *glink) |
1656 | { | |
1657 | struct glink_defer_cmd *dcmd; | |
1658 | struct glink_defer_cmd *tmp; | |
1659 | ||
1660 | /* cancel any pending deferred rx_work */ | |
1661 | cancel_work_sync(&glink->rx_work); | |
1662 | ||
1663 | list_for_each_entry_safe(dcmd, tmp, &glink->rx_queue, node) | |
1664 | kfree(dcmd); | |
1665 | } | |
1666 | ||
4e3dda0b CL |
1667 | static ssize_t rpmsg_name_show(struct device *dev, |
1668 | struct device_attribute *attr, char *buf) | |
1669 | { | |
1670 | int ret = 0; | |
1671 | const char *name; | |
1672 | ||
1673 | ret = of_property_read_string(dev->of_node, "label", &name); | |
1674 | if (ret < 0) | |
1675 | name = dev->of_node->name; | |
1676 | ||
1677 | return snprintf(buf, RPMSG_NAME_SIZE, "%s\n", name); | |
1678 | } | |
1679 | static DEVICE_ATTR_RO(rpmsg_name); | |
1680 | ||
1681 | static struct attribute *qcom_glink_attrs[] = { | |
1682 | &dev_attr_rpmsg_name.attr, | |
1683 | NULL | |
1684 | }; | |
1685 | ATTRIBUTE_GROUPS(qcom_glink); | |
1686 | ||
0f579e52 DKS |
1687 | static void qcom_glink_device_release(struct device *dev) |
1688 | { | |
1689 | struct rpmsg_device *rpdev = to_rpmsg_device(dev); | |
1690 | struct glink_channel *channel = to_glink_channel(rpdev->ept); | |
1691 | ||
1692 | /* Release qcom_glink_alloc_channel() reference */ | |
1693 | kref_put(&channel->refcount, qcom_glink_channel_release); | |
1694 | kfree(rpdev); | |
1695 | } | |
1696 | ||
1697 | static int qcom_glink_create_chrdev(struct qcom_glink *glink) | |
1698 | { | |
1699 | struct rpmsg_device *rpdev; | |
1700 | struct glink_channel *channel; | |
1701 | ||
1702 | rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL); | |
1703 | if (!rpdev) | |
1704 | return -ENOMEM; | |
1705 | ||
1706 | channel = qcom_glink_alloc_channel(glink, "rpmsg_chrdev"); | |
1707 | if (IS_ERR(channel)) { | |
1708 | kfree(rpdev); | |
1709 | return PTR_ERR(channel); | |
1710 | } | |
1711 | channel->rpdev = rpdev; | |
1712 | ||
1713 | rpdev->ept = &channel->ept; | |
1714 | rpdev->ops = &glink_device_ops; | |
1715 | rpdev->dev.parent = glink->dev; | |
1716 | rpdev->dev.release = qcom_glink_device_release; | |
1717 | ||
472f84ee | 1718 | return rpmsg_ctrldev_register_device(rpdev); |
0f579e52 DKS |
1719 | } |
1720 | ||
835764dd | 1721 | struct qcom_glink *qcom_glink_native_probe(struct device *dev, |
d31ad615 | 1722 | unsigned long features, |
835764dd | 1723 | struct qcom_glink_pipe *rx, |
933b45da S |
1724 | struct qcom_glink_pipe *tx, |
1725 | bool intentless) | |
835764dd BA |
1726 | { |
1727 | int irq; | |
1728 | int ret; | |
1729 | struct qcom_glink *glink; | |
1730 | ||
1731 | glink = devm_kzalloc(dev, sizeof(*glink), GFP_KERNEL); | |
1732 | if (!glink) | |
1733 | return ERR_PTR(-ENOMEM); | |
1734 | ||
1735 | glink->dev = dev; | |
1736 | glink->tx_pipe = tx; | |
1737 | glink->rx_pipe = rx; | |
1738 | ||
d31ad615 | 1739 | glink->features = features; |
933b45da | 1740 | glink->intentless = intentless; |
d31ad615 | 1741 | |
29fc9b38 | 1742 | spin_lock_init(&glink->tx_lock); |
835764dd BA |
1743 | spin_lock_init(&glink->rx_lock); |
1744 | INIT_LIST_HEAD(&glink->rx_queue); | |
1745 | INIT_WORK(&glink->rx_work, qcom_glink_work); | |
b16a37e1 | 1746 | init_waitqueue_head(&glink->tx_avail_notify); |
835764dd | 1747 | |
44f6df92 | 1748 | spin_lock_init(&glink->idr_lock); |
835764dd BA |
1749 | idr_init(&glink->lcids); |
1750 | idr_init(&glink->rcids); | |
1751 | ||
4e3dda0b CL |
1752 | glink->dev->groups = qcom_glink_groups; |
1753 | ||
1754 | ret = device_add_groups(dev, qcom_glink_groups); | |
1755 | if (ret) | |
1756 | dev_err(dev, "failed to add groups\n"); | |
1757 | ||
475452fc CL |
1758 | ret = of_property_read_string(dev->of_node, "label", &glink->name); |
1759 | if (ret < 0) | |
1760 | glink->name = dev->of_node->name; | |
1761 | ||
835764dd | 1762 | glink->mbox_client.dev = dev; |
38a9acb3 | 1763 | glink->mbox_client.knows_txdone = true; |
835764dd BA |
1764 | glink->mbox_chan = mbox_request_channel(&glink->mbox_client, 0); |
1765 | if (IS_ERR(glink->mbox_chan)) { | |
1766 | if (PTR_ERR(glink->mbox_chan) != -EPROBE_DEFER) | |
1767 | dev_err(dev, "failed to acquire IPC channel\n"); | |
1768 | return ERR_CAST(glink->mbox_chan); | |
1769 | } | |
1770 | ||
1771 | irq = of_irq_get(dev->of_node, 0); | |
1772 | ret = devm_request_irq(dev, irq, | |
1773 | qcom_glink_native_intr, | |
1774 | IRQF_NO_SUSPEND | IRQF_SHARED, | |
1775 | "glink-native", glink); | |
1776 | if (ret) { | |
1777 | dev_err(dev, "failed to request IRQ\n"); | |
1778 | return ERR_PTR(ret); | |
1779 | } | |
1780 | ||
1781 | glink->irq = irq; | |
1782 | ||
1783 | ret = qcom_glink_send_version(glink); | |
1784 | if (ret) | |
1785 | return ERR_PTR(ret); | |
1786 | ||
0f579e52 DKS |
1787 | ret = qcom_glink_create_chrdev(glink); |
1788 | if (ret) | |
1789 | dev_err(glink->dev, "failed to register chrdev\n"); | |
1790 | ||
835764dd BA |
1791 | return glink; |
1792 | } | |
f8ff9777 | 1793 | EXPORT_SYMBOL_GPL(qcom_glink_native_probe); |
835764dd BA |
1794 | |
1795 | static int qcom_glink_remove_device(struct device *dev, void *data) | |
1796 | { | |
1797 | device_unregister(dev); | |
1798 | ||
1799 | return 0; | |
1800 | } | |
1801 | ||
1802 | void qcom_glink_native_remove(struct qcom_glink *glink) | |
1803 | { | |
1804 | struct glink_channel *channel; | |
1805 | int cid; | |
1806 | int ret; | |
1807 | ||
1808 | disable_irq(glink->irq); | |
278bcb73 | 1809 | qcom_glink_cancel_rx_work(glink); |
835764dd BA |
1810 | |
1811 | ret = device_for_each_child(glink->dev, NULL, qcom_glink_remove_device); | |
1812 | if (ret) | |
1813 | dev_warn(glink->dev, "Can't remove GLINK devices: %d\n", ret); | |
1814 | ||
1815 | /* Release any defunct local channels, waiting for close-ack */ | |
1816 | idr_for_each_entry(&glink->lcids, channel, cid) | |
1817 | kref_put(&channel->refcount, qcom_glink_channel_release); | |
1818 | ||
b646293e CL |
1819 | /* Release any defunct local channels, waiting for close-req */ |
1820 | idr_for_each_entry(&glink->rcids, channel, cid) | |
1821 | kref_put(&channel->refcount, qcom_glink_channel_release); | |
1822 | ||
835764dd BA |
1823 | idr_destroy(&glink->lcids); |
1824 | idr_destroy(&glink->rcids); | |
76cf1105 | 1825 | mbox_free_channel(glink->mbox_chan); |
835764dd | 1826 | } |
f8ff9777 | 1827 | EXPORT_SYMBOL_GPL(qcom_glink_native_remove); |
caf989c3 BA |
1828 | |
1829 | void qcom_glink_native_unregister(struct qcom_glink *glink) | |
1830 | { | |
1831 | device_unregister(glink->dev); | |
1832 | } | |
f8ff9777 | 1833 | EXPORT_SYMBOL_GPL(qcom_glink_native_unregister); |
1e0d5615 BA |
1834 | |
1835 | MODULE_DESCRIPTION("Qualcomm GLINK driver"); | |
1836 | MODULE_LICENSE("GPL v2"); |