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1// SPDX-License-Identifier: BSD-3-Clause-Clear
2/*
3 * Copyright (c) 2018-2019 The Linux Foundation. All rights reserved.
4 * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
5 */
6#include <linux/skbuff.h>
7#include <linux/ctype.h>
8
9#include "debug.h"
10#include "hif.h"
11
12struct sk_buff *ath11k_htc_alloc_skb(struct ath11k_base *ab, int size)
13{
14 struct sk_buff *skb;
15
16 skb = dev_alloc_skb(size + sizeof(struct ath11k_htc_hdr));
17 if (!skb)
18 return NULL;
19
20 skb_reserve(skb, sizeof(struct ath11k_htc_hdr));
21
22 /* FW/HTC requires 4-byte aligned streams */
23 if (!IS_ALIGNED((unsigned long)skb->data, 4))
24 ath11k_warn(ab, "Unaligned HTC tx skb\n");
25
26 return skb;
27}
28
29static void ath11k_htc_control_tx_complete(struct ath11k_base *ab,
30 struct sk_buff *skb)
31{
32 kfree_skb(skb);
33}
34
35static struct sk_buff *ath11k_htc_build_tx_ctrl_skb(void *ab)
36{
37 struct sk_buff *skb;
38 struct ath11k_skb_cb *skb_cb;
39
40 skb = dev_alloc_skb(ATH11K_HTC_CONTROL_BUFFER_SIZE);
41 if (!skb)
42 return NULL;
43
44 skb_reserve(skb, sizeof(struct ath11k_htc_hdr));
45 WARN_ON_ONCE(!IS_ALIGNED((unsigned long)skb->data, 4));
46
47 skb_cb = ATH11K_SKB_CB(skb);
48 memset(skb_cb, 0, sizeof(*skb_cb));
49
50 return skb;
51}
52
53static void ath11k_htc_prepare_tx_skb(struct ath11k_htc_ep *ep,
54 struct sk_buff *skb)
55{
56 struct ath11k_htc_hdr *hdr;
57
58 hdr = (struct ath11k_htc_hdr *)skb->data;
59
60 memset(hdr, 0, sizeof(*hdr));
61 hdr->htc_info = FIELD_PREP(HTC_HDR_ENDPOINTID, ep->eid) |
62 FIELD_PREP(HTC_HDR_PAYLOADLEN,
63 (skb->len - sizeof(*hdr)));
64
65 if (ep->tx_credit_flow_enabled)
66 hdr->htc_info |= FIELD_PREP(HTC_HDR_FLAGS,
67 ATH11K_HTC_FLAG_NEED_CREDIT_UPDATE);
68
69 spin_lock_bh(&ep->htc->tx_lock);
70 hdr->ctrl_info = FIELD_PREP(HTC_HDR_CONTROLBYTES1, ep->seq_no++);
71 spin_unlock_bh(&ep->htc->tx_lock);
72}
73
74int ath11k_htc_send(struct ath11k_htc *htc,
75 enum ath11k_htc_ep_id eid,
76 struct sk_buff *skb)
77{
78 struct ath11k_htc_ep *ep = &htc->endpoint[eid];
79 struct ath11k_skb_cb *skb_cb = ATH11K_SKB_CB(skb);
80 struct device *dev = htc->ab->dev;
81 struct ath11k_base *ab = htc->ab;
82 int credits = 0;
83 int ret;
84 bool credit_flow_enabled = (ab->hw_params.credit_flow &&
85 ep->tx_credit_flow_enabled);
86
87 if (eid >= ATH11K_HTC_EP_COUNT) {
88 ath11k_warn(ab, "Invalid endpoint id: %d\n", eid);
89 return -ENOENT;
90 }
91
92 skb_push(skb, sizeof(struct ath11k_htc_hdr));
93
94 if (credit_flow_enabled) {
95 credits = DIV_ROUND_UP(skb->len, htc->target_credit_size);
96 spin_lock_bh(&htc->tx_lock);
97 if (ep->tx_credits < credits) {
98 ath11k_dbg(ab, ATH11K_DBG_HTC,
99 "ep %d insufficient credits required %d total %d\n",
100 eid, credits, ep->tx_credits);
101 spin_unlock_bh(&htc->tx_lock);
102 ret = -EAGAIN;
103 goto err_pull;
104 }
105 ep->tx_credits -= credits;
106 ath11k_dbg(ab, ATH11K_DBG_HTC,
107 "ep %d credits consumed %d total %d\n",
108 eid, credits, ep->tx_credits);
109 spin_unlock_bh(&htc->tx_lock);
110 }
111
112 ath11k_htc_prepare_tx_skb(ep, skb);
113
114 skb_cb->eid = eid;
115 skb_cb->paddr = dma_map_single(dev, skb->data, skb->len, DMA_TO_DEVICE);
116 ret = dma_mapping_error(dev, skb_cb->paddr);
117 if (ret) {
118 ret = -EIO;
119 goto err_credits;
120 }
121
122 ath11k_dbg(ab, ATH11K_DBG_HTC, "tx skb %p eid %d paddr %pad\n",
123 skb, skb_cb->eid, &skb_cb->paddr);
124
125 ret = ath11k_ce_send(htc->ab, skb, ep->ul_pipe_id, ep->eid);
126 if (ret)
127 goto err_unmap;
128
129 return 0;
130
131err_unmap:
132 dma_unmap_single(dev, skb_cb->paddr, skb->len, DMA_TO_DEVICE);
133err_credits:
134 if (credit_flow_enabled) {
135 spin_lock_bh(&htc->tx_lock);
136 ep->tx_credits += credits;
137 ath11k_dbg(ab, ATH11K_DBG_HTC,
138 "ep %d credits reverted %d total %d\n",
139 eid, credits, ep->tx_credits);
140 spin_unlock_bh(&htc->tx_lock);
141
142 if (ep->ep_ops.ep_tx_credits)
143 ep->ep_ops.ep_tx_credits(htc->ab);
144 }
145err_pull:
146 skb_pull(skb, sizeof(struct ath11k_htc_hdr));
147 return ret;
148}
149
150static void
151ath11k_htc_process_credit_report(struct ath11k_htc *htc,
152 const struct ath11k_htc_credit_report *report,
153 int len,
154 enum ath11k_htc_ep_id eid)
155{
156 struct ath11k_base *ab = htc->ab;
157 struct ath11k_htc_ep *ep;
158 int i, n_reports;
159
160 if (len % sizeof(*report))
161 ath11k_warn(ab, "Uneven credit report len %d", len);
162
163 n_reports = len / sizeof(*report);
164
165 spin_lock_bh(&htc->tx_lock);
166 for (i = 0; i < n_reports; i++, report++) {
167 if (report->eid >= ATH11K_HTC_EP_COUNT)
168 break;
169
170 ep = &htc->endpoint[report->eid];
171 ep->tx_credits += report->credits;
172
173 ath11k_dbg(ab, ATH11K_DBG_HTC, "ep %d credits got %d total %d\n",
174 report->eid, report->credits, ep->tx_credits);
175
176 if (ep->ep_ops.ep_tx_credits) {
177 spin_unlock_bh(&htc->tx_lock);
178 ep->ep_ops.ep_tx_credits(htc->ab);
179 spin_lock_bh(&htc->tx_lock);
180 }
181 }
182 spin_unlock_bh(&htc->tx_lock);
183}
184
185static int ath11k_htc_process_trailer(struct ath11k_htc *htc,
186 u8 *buffer,
187 int length,
188 enum ath11k_htc_ep_id src_eid)
189{
190 struct ath11k_base *ab = htc->ab;
191 int status = 0;
192 struct ath11k_htc_record *record;
193 size_t len;
194
195 while (length > 0) {
196 record = (struct ath11k_htc_record *)buffer;
197
198 if (length < sizeof(record->hdr)) {
199 status = -EINVAL;
200 break;
201 }
202
203 if (record->hdr.len > length) {
204 /* no room left in buffer for record */
205 ath11k_warn(ab, "Invalid record length: %d\n",
206 record->hdr.len);
207 status = -EINVAL;
208 break;
209 }
210
211 if (ab->hw_params.credit_flow) {
212 switch (record->hdr.id) {
213 case ATH11K_HTC_RECORD_CREDITS:
214 len = sizeof(struct ath11k_htc_credit_report);
215 if (record->hdr.len < len) {
216 ath11k_warn(ab, "Credit report too long\n");
217 status = -EINVAL;
218 break;
219 }
220 ath11k_htc_process_credit_report(htc,
221 record->credit_report,
222 record->hdr.len,
223 src_eid);
224 break;
225 default:
226 ath11k_warn(ab, "Unhandled record: id:%d length:%d\n",
227 record->hdr.id, record->hdr.len);
228 break;
229 }
230 }
231
232 if (status)
233 break;
234
235 /* multiple records may be present in a trailer */
236 buffer += sizeof(record->hdr) + record->hdr.len;
237 length -= sizeof(record->hdr) + record->hdr.len;
238 }
239
240 return status;
241}
242
243static void ath11k_htc_suspend_complete(struct ath11k_base *ab, bool ack)
244{
245 ath11k_dbg(ab, ATH11K_DBG_BOOT, "suspend complete %d\n", ack);
246
247 if (ack)
248 set_bit(ATH11K_FLAG_HTC_SUSPEND_COMPLETE, &ab->dev_flags);
249 else
250 clear_bit(ATH11K_FLAG_HTC_SUSPEND_COMPLETE, &ab->dev_flags);
251
252 complete(&ab->htc_suspend);
253}
254
255void ath11k_htc_tx_completion_handler(struct ath11k_base *ab,
256 struct sk_buff *skb)
257{
258 struct ath11k_htc *htc = &ab->htc;
259 struct ath11k_htc_ep *ep;
260 void (*ep_tx_complete)(struct ath11k_base *, struct sk_buff *);
261 u8 eid;
262
263 eid = ATH11K_SKB_CB(skb)->eid;
264 if (eid >= ATH11K_HTC_EP_COUNT) {
265 dev_kfree_skb_any(skb);
266 return;
267 }
268
269 ep = &htc->endpoint[eid];
270 spin_lock_bh(&htc->tx_lock);
271 ep_tx_complete = ep->ep_ops.ep_tx_complete;
272 spin_unlock_bh(&htc->tx_lock);
273 if (!ep_tx_complete) {
274 dev_kfree_skb_any(skb);
275 return;
276 }
277 ep_tx_complete(htc->ab, skb);
278}
279
280static void ath11k_htc_wakeup_from_suspend(struct ath11k_base *ab)
281{
282 ath11k_dbg(ab, ATH11K_DBG_BOOT, "wakeup from suspend is received\n");
283}
284
285void ath11k_htc_rx_completion_handler(struct ath11k_base *ab,
286 struct sk_buff *skb)
287{
288 int status = 0;
289 struct ath11k_htc *htc = &ab->htc;
290 struct ath11k_htc_hdr *hdr;
291 struct ath11k_htc_ep *ep;
292 u16 payload_len;
293 u32 message_id, trailer_len = 0;
294 size_t min_len;
295 u8 eid;
296 bool trailer_present;
297
298 hdr = (struct ath11k_htc_hdr *)skb->data;
299 skb_pull(skb, sizeof(*hdr));
300
301 eid = FIELD_GET(HTC_HDR_ENDPOINTID, hdr->htc_info);
302
303 if (eid >= ATH11K_HTC_EP_COUNT) {
304 ath11k_warn(ab, "HTC Rx: invalid eid %d\n", eid);
305 goto out;
306 }
307
308 ep = &htc->endpoint[eid];
309
310 payload_len = FIELD_GET(HTC_HDR_PAYLOADLEN, hdr->htc_info);
311
312 if (payload_len + sizeof(*hdr) > ATH11K_HTC_MAX_LEN) {
313 ath11k_warn(ab, "HTC rx frame too long, len: %zu\n",
314 payload_len + sizeof(*hdr));
315 goto out;
316 }
317
318 if (skb->len < payload_len) {
319 ath11k_warn(ab, "HTC Rx: insufficient length, got %d, expected %d\n",
320 skb->len, payload_len);
321 goto out;
322 }
323
324 /* get flags to check for trailer */
325 trailer_present = (FIELD_GET(HTC_HDR_FLAGS, hdr->htc_info)) &
326 ATH11K_HTC_FLAG_TRAILER_PRESENT;
327
328 ath11k_dbg(ab, ATH11K_DBG_HTC, "rx ep %d skb %p trailer_present %d\n",
329 eid, skb, trailer_present);
330
331 if (trailer_present) {
332 u8 *trailer;
333
334 trailer_len = FIELD_GET(HTC_HDR_CONTROLBYTES0, hdr->ctrl_info);
335 min_len = sizeof(struct ath11k_htc_record_hdr);
336
337 if ((trailer_len < min_len) ||
338 (trailer_len > payload_len)) {
339 ath11k_warn(ab, "Invalid trailer length: %d\n",
340 trailer_len);
341 goto out;
342 }
343
344 trailer = (u8 *)hdr;
345 trailer += sizeof(*hdr);
346 trailer += payload_len;
347 trailer -= trailer_len;
348 status = ath11k_htc_process_trailer(htc, trailer,
349 trailer_len, eid);
350 if (status)
351 goto out;
352
353 skb_trim(skb, skb->len - trailer_len);
354 }
355
356 if (trailer_len >= payload_len)
357 /* zero length packet with trailer data, just drop these */
358 goto out;
359
360 if (eid == ATH11K_HTC_EP_0) {
361 struct ath11k_htc_msg *msg = (struct ath11k_htc_msg *)skb->data;
362
363 message_id = FIELD_GET(HTC_MSG_MESSAGEID, msg->msg_svc_id);
364
365 ath11k_dbg(ab, ATH11K_DBG_HTC, "rx ep %d skb %p message_id %d\n",
366 eid, skb, message_id);
367
368 switch (message_id) {
369 case ATH11K_HTC_MSG_READY_ID:
370 case ATH11K_HTC_MSG_CONNECT_SERVICE_RESP_ID:
371 /* handle HTC control message */
372 if (completion_done(&htc->ctl_resp)) {
373 /* this is a fatal error, target should not be
374 * sending unsolicited messages on the ep 0
375 */
376 ath11k_warn(ab, "HTC rx ctrl still processing\n");
377 complete(&htc->ctl_resp);
378 goto out;
379 }
380
381 htc->control_resp_len =
382 min_t(int, skb->len,
383 ATH11K_HTC_MAX_CTRL_MSG_LEN);
384
385 memcpy(htc->control_resp_buffer, skb->data,
386 htc->control_resp_len);
387
388 complete(&htc->ctl_resp);
389 break;
390 case ATH11K_HTC_MSG_SEND_SUSPEND_COMPLETE:
391 ath11k_htc_suspend_complete(ab, true);
392 break;
393 case ATH11K_HTC_MSG_NACK_SUSPEND:
394 ath11k_htc_suspend_complete(ab, false);
395 break;
396 case ATH11K_HTC_MSG_WAKEUP_FROM_SUSPEND_ID:
397 ath11k_htc_wakeup_from_suspend(ab);
398 break;
399 default:
400 ath11k_warn(ab, "ignoring unsolicited htc ep0 event %ld\n",
401 FIELD_GET(HTC_MSG_MESSAGEID, msg->msg_svc_id));
402 break;
403 }
404 goto out;
405 }
406
407 ep->ep_ops.ep_rx_complete(ab, skb);
408
409 /* poll tx completion for interrupt disabled CE's */
410 ath11k_ce_poll_send_completed(ab, ep->ul_pipe_id);
411
412 /* skb is now owned by the rx completion handler */
413 skb = NULL;
414out:
415 kfree_skb(skb);
416}
417
418static void ath11k_htc_control_rx_complete(struct ath11k_base *ab,
419 struct sk_buff *skb)
420{
421 /* This is unexpected. FW is not supposed to send regular rx on this
422 * endpoint.
423 */
424 ath11k_warn(ab, "unexpected htc rx\n");
425 kfree_skb(skb);
426}
427
428static const char *htc_service_name(enum ath11k_htc_svc_id id)
429{
430 switch (id) {
431 case ATH11K_HTC_SVC_ID_RESERVED:
432 return "Reserved";
433 case ATH11K_HTC_SVC_ID_RSVD_CTRL:
434 return "Control";
435 case ATH11K_HTC_SVC_ID_WMI_CONTROL:
436 return "WMI";
437 case ATH11K_HTC_SVC_ID_WMI_DATA_BE:
438 return "DATA BE";
439 case ATH11K_HTC_SVC_ID_WMI_DATA_BK:
440 return "DATA BK";
441 case ATH11K_HTC_SVC_ID_WMI_DATA_VI:
442 return "DATA VI";
443 case ATH11K_HTC_SVC_ID_WMI_DATA_VO:
444 return "DATA VO";
445 case ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC1:
446 return "WMI MAC1";
447 case ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC2:
448 return "WMI MAC2";
449 case ATH11K_HTC_SVC_ID_NMI_CONTROL:
450 return "NMI Control";
451 case ATH11K_HTC_SVC_ID_NMI_DATA:
452 return "NMI Data";
453 case ATH11K_HTC_SVC_ID_HTT_DATA_MSG:
454 return "HTT Data";
455 case ATH11K_HTC_SVC_ID_TEST_RAW_STREAMS:
456 return "RAW";
457 case ATH11K_HTC_SVC_ID_IPA_TX:
458 return "IPA TX";
459 case ATH11K_HTC_SVC_ID_PKT_LOG:
460 return "PKT LOG";
461 }
462
463 return "Unknown";
464}
465
466static void ath11k_htc_reset_endpoint_states(struct ath11k_htc *htc)
467{
468 struct ath11k_htc_ep *ep;
469 int i;
470
471 for (i = ATH11K_HTC_EP_0; i < ATH11K_HTC_EP_COUNT; i++) {
472 ep = &htc->endpoint[i];
473 ep->service_id = ATH11K_HTC_SVC_ID_UNUSED;
474 ep->max_ep_message_len = 0;
475 ep->max_tx_queue_depth = 0;
476 ep->eid = i;
477 ep->htc = htc;
478 ep->tx_credit_flow_enabled = true;
479 }
480}
481
482static u8 ath11k_htc_get_credit_allocation(struct ath11k_htc *htc,
483 u16 service_id)
484{
485 u8 i, allocation = 0;
486
487 for (i = 0; i < ATH11K_HTC_MAX_SERVICE_ALLOC_ENTRIES; i++) {
488 if (htc->service_alloc_table[i].service_id == service_id) {
489 allocation =
490 htc->service_alloc_table[i].credit_allocation;
491 }
492 }
493
494 return allocation;
495}
496
497static int ath11k_htc_setup_target_buffer_assignments(struct ath11k_htc *htc)
498{
499 struct ath11k_htc_svc_tx_credits *serv_entry;
500 u32 svc_id[] = {
501 ATH11K_HTC_SVC_ID_WMI_CONTROL,
502 ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC1,
503 ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC2,
504 };
505 int i, credits;
506
507 credits = htc->total_transmit_credits;
508 serv_entry = htc->service_alloc_table;
509
510 if ((htc->wmi_ep_count == 0) ||
511 (htc->wmi_ep_count > ARRAY_SIZE(svc_id)))
512 return -EINVAL;
513
514 /* Divide credits among number of endpoints for WMI */
515 credits = credits / htc->wmi_ep_count;
516 for (i = 0; i < htc->wmi_ep_count; i++) {
517 serv_entry[i].service_id = svc_id[i];
518 serv_entry[i].credit_allocation = credits;
519 }
520
521 return 0;
522}
523
524int ath11k_htc_wait_target(struct ath11k_htc *htc)
525{
526 int i, status = 0;
527 struct ath11k_base *ab = htc->ab;
528 unsigned long time_left;
529 struct ath11k_htc_ready *ready;
530 u16 message_id;
531 u16 credit_count;
532 u16 credit_size;
533
534 time_left = wait_for_completion_timeout(&htc->ctl_resp,
535 ATH11K_HTC_WAIT_TIMEOUT_HZ);
536 if (!time_left) {
537 ath11k_warn(ab, "failed to receive control response completion, polling..\n");
538
539 for (i = 0; i < ab->hw_params.ce_count; i++)
540 ath11k_ce_per_engine_service(htc->ab, i);
541
542 time_left =
543 wait_for_completion_timeout(&htc->ctl_resp,
544 ATH11K_HTC_WAIT_TIMEOUT_HZ);
545
546 if (!time_left)
547 status = -ETIMEDOUT;
548 }
549
550 if (status < 0) {
551 ath11k_warn(ab, "ctl_resp never came in (%d)\n", status);
552 return status;
553 }
554
555 if (htc->control_resp_len < sizeof(*ready)) {
556 ath11k_warn(ab, "Invalid HTC ready msg len:%d\n",
557 htc->control_resp_len);
558 return -ECOMM;
559 }
560
561 ready = (struct ath11k_htc_ready *)htc->control_resp_buffer;
562 message_id = FIELD_GET(HTC_MSG_MESSAGEID, ready->id_credit_count);
563 credit_count = FIELD_GET(HTC_READY_MSG_CREDITCOUNT,
564 ready->id_credit_count);
565 credit_size = FIELD_GET(HTC_READY_MSG_CREDITSIZE, ready->size_ep);
566
567 if (message_id != ATH11K_HTC_MSG_READY_ID) {
568 ath11k_warn(ab, "Invalid HTC ready msg: 0x%x\n", message_id);
569 return -ECOMM;
570 }
571
572 htc->total_transmit_credits = credit_count;
573 htc->target_credit_size = credit_size;
574
575 ath11k_dbg(ab, ATH11K_DBG_HTC,
576 "target ready total_transmit_credits %d target_credit_size %d\n",
577 htc->total_transmit_credits, htc->target_credit_size);
578
579 if ((htc->total_transmit_credits == 0) ||
580 (htc->target_credit_size == 0)) {
581 ath11k_warn(ab, "Invalid credit size received\n");
582 return -ECOMM;
583 }
584
585 /* For QCA6390, wmi endpoint uses 1 credit to avoid
586 * back-to-back write.
587 */
588 if (ab->hw_params.supports_shadow_regs)
589 htc->total_transmit_credits = 1;
590
591 ath11k_htc_setup_target_buffer_assignments(htc);
592
593 return 0;
594}
595
596int ath11k_htc_connect_service(struct ath11k_htc *htc,
597 struct ath11k_htc_svc_conn_req *conn_req,
598 struct ath11k_htc_svc_conn_resp *conn_resp)
599{
600 struct ath11k_base *ab = htc->ab;
601 struct ath11k_htc_conn_svc *req_msg;
602 struct ath11k_htc_conn_svc_resp resp_msg_dummy;
603 struct ath11k_htc_conn_svc_resp *resp_msg = &resp_msg_dummy;
604 enum ath11k_htc_ep_id assigned_eid = ATH11K_HTC_EP_COUNT;
605 struct ath11k_htc_ep *ep;
606 struct sk_buff *skb;
607 unsigned int max_msg_size = 0;
608 int length, status;
609 unsigned long time_left;
610 bool disable_credit_flow_ctrl = false;
611 u16 message_id, service_id, flags = 0;
612 u8 tx_alloc = 0;
613
614 /* special case for HTC pseudo control service */
615 if (conn_req->service_id == ATH11K_HTC_SVC_ID_RSVD_CTRL) {
616 disable_credit_flow_ctrl = true;
617 assigned_eid = ATH11K_HTC_EP_0;
618 max_msg_size = ATH11K_HTC_MAX_CTRL_MSG_LEN;
619 memset(&resp_msg_dummy, 0, sizeof(resp_msg_dummy));
620 goto setup;
621 }
622
623 tx_alloc = ath11k_htc_get_credit_allocation(htc,
624 conn_req->service_id);
625 if (!tx_alloc)
626 ath11k_dbg(ab, ATH11K_DBG_BOOT,
627 "htc service %s does not allocate target credits\n",
628 htc_service_name(conn_req->service_id));
629
630 skb = ath11k_htc_build_tx_ctrl_skb(htc->ab);
631 if (!skb) {
632 ath11k_warn(ab, "Failed to allocate HTC packet\n");
633 return -ENOMEM;
634 }
635
636 length = sizeof(*req_msg);
637 skb_put(skb, length);
638 memset(skb->data, 0, length);
639
640 req_msg = (struct ath11k_htc_conn_svc *)skb->data;
641 req_msg->msg_svc_id = FIELD_PREP(HTC_MSG_MESSAGEID,
642 ATH11K_HTC_MSG_CONNECT_SERVICE_ID);
643
644 flags |= FIELD_PREP(ATH11K_HTC_CONN_FLAGS_RECV_ALLOC, tx_alloc);
645
646 /* Only enable credit flow control for WMI ctrl service */
647 if (!(conn_req->service_id == ATH11K_HTC_SVC_ID_WMI_CONTROL ||
648 conn_req->service_id == ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC1 ||
649 conn_req->service_id == ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC2)) {
650 flags |= ATH11K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL;
651 disable_credit_flow_ctrl = true;
652 }
653
654 if (!ab->hw_params.credit_flow) {
655 flags |= ATH11K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL;
656 disable_credit_flow_ctrl = true;
657 }
658
659 req_msg->flags_len = FIELD_PREP(HTC_SVC_MSG_CONNECTIONFLAGS, flags);
660 req_msg->msg_svc_id |= FIELD_PREP(HTC_SVC_MSG_SERVICE_ID,
661 conn_req->service_id);
662
663 reinit_completion(&htc->ctl_resp);
664
665 status = ath11k_htc_send(htc, ATH11K_HTC_EP_0, skb);
666 if (status) {
667 kfree_skb(skb);
668 return status;
669 }
670
671 /* wait for response */
672 time_left = wait_for_completion_timeout(&htc->ctl_resp,
673 ATH11K_HTC_CONN_SVC_TIMEOUT_HZ);
674 if (!time_left) {
675 ath11k_err(ab, "Service connect timeout\n");
676 return -ETIMEDOUT;
677 }
678
679 /* we controlled the buffer creation, it's aligned */
680 resp_msg = (struct ath11k_htc_conn_svc_resp *)htc->control_resp_buffer;
681 message_id = FIELD_GET(HTC_MSG_MESSAGEID, resp_msg->msg_svc_id);
682 service_id = FIELD_GET(HTC_SVC_RESP_MSG_SERVICEID,
683 resp_msg->msg_svc_id);
684
685 if ((message_id != ATH11K_HTC_MSG_CONNECT_SERVICE_RESP_ID) ||
686 (htc->control_resp_len < sizeof(*resp_msg))) {
687 ath11k_err(ab, "Invalid resp message ID 0x%x", message_id);
688 return -EPROTO;
689 }
690
691 ath11k_dbg(ab, ATH11K_DBG_HTC,
692 "service %s connect response status 0x%lx assigned ep 0x%lx\n",
693 htc_service_name(service_id),
694 FIELD_GET(HTC_SVC_RESP_MSG_STATUS, resp_msg->flags_len),
695 FIELD_GET(HTC_SVC_RESP_MSG_ENDPOINTID, resp_msg->flags_len));
696
697 conn_resp->connect_resp_code = FIELD_GET(HTC_SVC_RESP_MSG_STATUS,
698 resp_msg->flags_len);
699
700 /* check response status */
701 if (conn_resp->connect_resp_code != ATH11K_HTC_CONN_SVC_STATUS_SUCCESS) {
702 ath11k_err(ab, "HTC Service %s connect request failed: 0x%x)\n",
703 htc_service_name(service_id),
704 conn_resp->connect_resp_code);
705 return -EPROTO;
706 }
707
708 assigned_eid = (enum ath11k_htc_ep_id)FIELD_GET(
709 HTC_SVC_RESP_MSG_ENDPOINTID,
710 resp_msg->flags_len);
711
712 max_msg_size = FIELD_GET(HTC_SVC_RESP_MSG_MAXMSGSIZE,
713 resp_msg->flags_len);
714
715setup:
716
717 if (assigned_eid >= ATH11K_HTC_EP_COUNT)
718 return -EPROTO;
719
720 if (max_msg_size == 0)
721 return -EPROTO;
722
723 ep = &htc->endpoint[assigned_eid];
724 ep->eid = assigned_eid;
725
726 if (ep->service_id != ATH11K_HTC_SVC_ID_UNUSED)
727 return -EPROTO;
728
729 /* return assigned endpoint to caller */
730 conn_resp->eid = assigned_eid;
731 conn_resp->max_msg_len = FIELD_GET(HTC_SVC_RESP_MSG_MAXMSGSIZE,
732 resp_msg->flags_len);
733
734 /* setup the endpoint */
735 ep->service_id = conn_req->service_id;
736 ep->max_tx_queue_depth = conn_req->max_send_queue_depth;
737 ep->max_ep_message_len = FIELD_GET(HTC_SVC_RESP_MSG_MAXMSGSIZE,
738 resp_msg->flags_len);
739 ep->tx_credits = tx_alloc;
740
741 /* copy all the callbacks */
742 ep->ep_ops = conn_req->ep_ops;
743
744 status = ath11k_hif_map_service_to_pipe(htc->ab,
745 ep->service_id,
746 &ep->ul_pipe_id,
747 &ep->dl_pipe_id);
748 if (status)
749 return status;
750
751 ath11k_dbg(ab, ATH11K_DBG_BOOT,
752 "htc service '%s' ul pipe %d dl pipe %d eid %d ready\n",
753 htc_service_name(ep->service_id), ep->ul_pipe_id,
754 ep->dl_pipe_id, ep->eid);
755
756 if (disable_credit_flow_ctrl && ep->tx_credit_flow_enabled) {
757 ep->tx_credit_flow_enabled = false;
758 ath11k_dbg(ab, ATH11K_DBG_BOOT,
759 "htc service '%s' eid %d tx flow control disabled\n",
760 htc_service_name(ep->service_id), assigned_eid);
761 }
762
763 return status;
764}
765
766int ath11k_htc_start(struct ath11k_htc *htc)
767{
768 struct sk_buff *skb;
769 int status = 0;
770 struct ath11k_base *ab = htc->ab;
771 struct ath11k_htc_setup_complete_extended *msg;
772
773 skb = ath11k_htc_build_tx_ctrl_skb(htc->ab);
774 if (!skb)
775 return -ENOMEM;
776
777 skb_put(skb, sizeof(*msg));
778 memset(skb->data, 0, skb->len);
779
780 msg = (struct ath11k_htc_setup_complete_extended *)skb->data;
781 msg->msg_id = FIELD_PREP(HTC_MSG_MESSAGEID,
782 ATH11K_HTC_MSG_SETUP_COMPLETE_EX_ID);
783
784 if (ab->hw_params.credit_flow)
785 ath11k_dbg(ab, ATH11K_DBG_HTC, "using tx credit flow control\n");
786 else
787 msg->flags |= ATH11K_GLOBAL_DISABLE_CREDIT_FLOW;
788
789 status = ath11k_htc_send(htc, ATH11K_HTC_EP_0, skb);
790 if (status) {
791 kfree_skb(skb);
792 return status;
793 }
794
795 return 0;
796}
797
798int ath11k_htc_init(struct ath11k_base *ab)
799{
800 struct ath11k_htc *htc = &ab->htc;
801 struct ath11k_htc_svc_conn_req conn_req;
802 struct ath11k_htc_svc_conn_resp conn_resp;
803 int ret;
804
805 spin_lock_init(&htc->tx_lock);
806
807 ath11k_htc_reset_endpoint_states(htc);
808
809 htc->ab = ab;
810
811 switch (ab->wmi_ab.preferred_hw_mode) {
812 case WMI_HOST_HW_MODE_SINGLE:
813 htc->wmi_ep_count = 1;
814 break;
815 case WMI_HOST_HW_MODE_DBS:
816 case WMI_HOST_HW_MODE_DBS_OR_SBS:
817 htc->wmi_ep_count = 2;
818 break;
819 case WMI_HOST_HW_MODE_DBS_SBS:
820 htc->wmi_ep_count = 3;
821 break;
822 default:
823 htc->wmi_ep_count = ab->hw_params.max_radios;
824 break;
825 }
826
827 /* setup our pseudo HTC control endpoint connection */
828 memset(&conn_req, 0, sizeof(conn_req));
829 memset(&conn_resp, 0, sizeof(conn_resp));
830 conn_req.ep_ops.ep_tx_complete = ath11k_htc_control_tx_complete;
831 conn_req.ep_ops.ep_rx_complete = ath11k_htc_control_rx_complete;
832 conn_req.max_send_queue_depth = ATH11K_NUM_CONTROL_TX_BUFFERS;
833 conn_req.service_id = ATH11K_HTC_SVC_ID_RSVD_CTRL;
834
835 /* connect fake service */
836 ret = ath11k_htc_connect_service(htc, &conn_req, &conn_resp);
837 if (ret) {
838 ath11k_err(ab, "could not connect to htc service (%d)\n", ret);
839 return ret;
840 }
841
842 init_completion(&htc->ctl_resp);
843
844 return 0;
845}
1// SPDX-License-Identifier: BSD-3-Clause-Clear
2/*
3 * Copyright (c) 2018-2019 The Linux Foundation. All rights reserved.
4 */
5#include <linux/skbuff.h>
6#include <linux/ctype.h>
7
8#include "debug.h"
9#include "hif.h"
10
11struct sk_buff *ath11k_htc_alloc_skb(struct ath11k_base *ab, int size)
12{
13 struct sk_buff *skb;
14
15 skb = dev_alloc_skb(size + sizeof(struct ath11k_htc_hdr));
16 if (!skb)
17 return NULL;
18
19 skb_reserve(skb, sizeof(struct ath11k_htc_hdr));
20
21 /* FW/HTC requires 4-byte aligned streams */
22 if (!IS_ALIGNED((unsigned long)skb->data, 4))
23 ath11k_warn(ab, "Unaligned HTC tx skb\n");
24
25 return skb;
26}
27
28static void ath11k_htc_control_tx_complete(struct ath11k_base *ab,
29 struct sk_buff *skb)
30{
31 kfree_skb(skb);
32}
33
34static struct sk_buff *ath11k_htc_build_tx_ctrl_skb(void *ab)
35{
36 struct sk_buff *skb;
37 struct ath11k_skb_cb *skb_cb;
38
39 skb = dev_alloc_skb(ATH11K_HTC_CONTROL_BUFFER_SIZE);
40 if (!skb)
41 return NULL;
42
43 skb_reserve(skb, sizeof(struct ath11k_htc_hdr));
44 WARN_ON_ONCE(!IS_ALIGNED((unsigned long)skb->data, 4));
45
46 skb_cb = ATH11K_SKB_CB(skb);
47 memset(skb_cb, 0, sizeof(*skb_cb));
48
49 ath11k_dbg(ab, ATH11K_DBG_HTC, "%s: skb %pK\n", __func__, skb);
50 return skb;
51}
52
53static inline void ath11k_htc_restore_tx_skb(struct ath11k_htc *htc,
54 struct sk_buff *skb)
55{
56 struct ath11k_skb_cb *skb_cb = ATH11K_SKB_CB(skb);
57
58 dma_unmap_single(htc->ab->dev, skb_cb->paddr, skb->len, DMA_TO_DEVICE);
59 skb_pull(skb, sizeof(struct ath11k_htc_hdr));
60}
61
62static void ath11k_htc_prepare_tx_skb(struct ath11k_htc_ep *ep,
63 struct sk_buff *skb)
64{
65 struct ath11k_htc_hdr *hdr;
66
67 hdr = (struct ath11k_htc_hdr *)skb->data;
68
69 memset(hdr, 0, sizeof(*hdr));
70 hdr->htc_info = FIELD_PREP(HTC_HDR_ENDPOINTID, ep->eid) |
71 FIELD_PREP(HTC_HDR_PAYLOADLEN,
72 (skb->len - sizeof(*hdr))) |
73 FIELD_PREP(HTC_HDR_FLAGS,
74 ATH11K_HTC_FLAG_NEED_CREDIT_UPDATE);
75
76 spin_lock_bh(&ep->htc->tx_lock);
77 hdr->ctrl_info = FIELD_PREP(HTC_HDR_CONTROLBYTES1, ep->seq_no++);
78 spin_unlock_bh(&ep->htc->tx_lock);
79}
80
81int ath11k_htc_send(struct ath11k_htc *htc,
82 enum ath11k_htc_ep_id eid,
83 struct sk_buff *skb)
84{
85 struct ath11k_htc_ep *ep = &htc->endpoint[eid];
86 struct ath11k_skb_cb *skb_cb = ATH11K_SKB_CB(skb);
87 struct device *dev = htc->ab->dev;
88 struct ath11k_base *ab = htc->ab;
89 int credits = 0;
90 int ret;
91
92 if (eid >= ATH11K_HTC_EP_COUNT) {
93 ath11k_warn(ab, "Invalid endpoint id: %d\n", eid);
94 return -ENOENT;
95 }
96
97 skb_push(skb, sizeof(struct ath11k_htc_hdr));
98
99 if (ep->tx_credit_flow_enabled) {
100 credits = DIV_ROUND_UP(skb->len, htc->target_credit_size);
101 spin_lock_bh(&htc->tx_lock);
102 if (ep->tx_credits < credits) {
103 ath11k_dbg(ab, ATH11K_DBG_HTC,
104 "htc insufficient credits ep %d required %d available %d\n",
105 eid, credits, ep->tx_credits);
106 spin_unlock_bh(&htc->tx_lock);
107 ret = -EAGAIN;
108 goto err_pull;
109 }
110 ep->tx_credits -= credits;
111 ath11k_dbg(ab, ATH11K_DBG_HTC,
112 "htc ep %d consumed %d credits (total %d)\n",
113 eid, credits, ep->tx_credits);
114 spin_unlock_bh(&htc->tx_lock);
115 }
116
117 ath11k_htc_prepare_tx_skb(ep, skb);
118
119 skb_cb->eid = eid;
120 skb_cb->paddr = dma_map_single(dev, skb->data, skb->len, DMA_TO_DEVICE);
121 ret = dma_mapping_error(dev, skb_cb->paddr);
122 if (ret) {
123 ret = -EIO;
124 goto err_credits;
125 }
126
127 ret = ath11k_ce_send(htc->ab, skb, ep->ul_pipe_id, ep->eid);
128 if (ret)
129 goto err_unmap;
130
131 return 0;
132
133err_unmap:
134 dma_unmap_single(dev, skb_cb->paddr, skb->len, DMA_TO_DEVICE);
135err_credits:
136 if (ep->tx_credit_flow_enabled) {
137 spin_lock_bh(&htc->tx_lock);
138 ep->tx_credits += credits;
139 ath11k_dbg(ab, ATH11K_DBG_HTC,
140 "htc ep %d reverted %d credits back (total %d)\n",
141 eid, credits, ep->tx_credits);
142 spin_unlock_bh(&htc->tx_lock);
143
144 if (ep->ep_ops.ep_tx_credits)
145 ep->ep_ops.ep_tx_credits(htc->ab);
146 }
147err_pull:
148 skb_pull(skb, sizeof(struct ath11k_htc_hdr));
149 return ret;
150}
151
152static void
153ath11k_htc_process_credit_report(struct ath11k_htc *htc,
154 const struct ath11k_htc_credit_report *report,
155 int len,
156 enum ath11k_htc_ep_id eid)
157{
158 struct ath11k_base *ab = htc->ab;
159 struct ath11k_htc_ep *ep;
160 int i, n_reports;
161
162 if (len % sizeof(*report))
163 ath11k_warn(ab, "Uneven credit report len %d", len);
164
165 n_reports = len / sizeof(*report);
166
167 spin_lock_bh(&htc->tx_lock);
168 for (i = 0; i < n_reports; i++, report++) {
169 if (report->eid >= ATH11K_HTC_EP_COUNT)
170 break;
171
172 ep = &htc->endpoint[report->eid];
173 ep->tx_credits += report->credits;
174
175 ath11k_dbg(ab, ATH11K_DBG_HTC, "htc ep %d got %d credits (total %d)\n",
176 report->eid, report->credits, ep->tx_credits);
177
178 if (ep->ep_ops.ep_tx_credits) {
179 spin_unlock_bh(&htc->tx_lock);
180 ep->ep_ops.ep_tx_credits(htc->ab);
181 spin_lock_bh(&htc->tx_lock);
182 }
183 }
184 spin_unlock_bh(&htc->tx_lock);
185}
186
187static int ath11k_htc_process_trailer(struct ath11k_htc *htc,
188 u8 *buffer,
189 int length,
190 enum ath11k_htc_ep_id src_eid)
191{
192 struct ath11k_base *ab = htc->ab;
193 int status = 0;
194 struct ath11k_htc_record *record;
195 size_t len;
196
197 while (length > 0) {
198 record = (struct ath11k_htc_record *)buffer;
199
200 if (length < sizeof(record->hdr)) {
201 status = -EINVAL;
202 break;
203 }
204
205 if (record->hdr.len > length) {
206 /* no room left in buffer for record */
207 ath11k_warn(ab, "Invalid record length: %d\n",
208 record->hdr.len);
209 status = -EINVAL;
210 break;
211 }
212
213 switch (record->hdr.id) {
214 case ATH11K_HTC_RECORD_CREDITS:
215 len = sizeof(struct ath11k_htc_credit_report);
216 if (record->hdr.len < len) {
217 ath11k_warn(ab, "Credit report too long\n");
218 status = -EINVAL;
219 break;
220 }
221 ath11k_htc_process_credit_report(htc,
222 record->credit_report,
223 record->hdr.len,
224 src_eid);
225 break;
226 default:
227 ath11k_warn(ab, "Unhandled record: id:%d length:%d\n",
228 record->hdr.id, record->hdr.len);
229 break;
230 }
231
232 if (status)
233 break;
234
235 /* multiple records may be present in a trailer */
236 buffer += sizeof(record->hdr) + record->hdr.len;
237 length -= sizeof(record->hdr) + record->hdr.len;
238 }
239
240 return status;
241}
242
243void ath11k_htc_rx_completion_handler(struct ath11k_base *ab,
244 struct sk_buff *skb)
245{
246 int status = 0;
247 struct ath11k_htc *htc = &ab->htc;
248 struct ath11k_htc_hdr *hdr;
249 struct ath11k_htc_ep *ep;
250 u16 payload_len;
251 u32 trailer_len = 0;
252 size_t min_len;
253 u8 eid;
254 bool trailer_present;
255
256 hdr = (struct ath11k_htc_hdr *)skb->data;
257 skb_pull(skb, sizeof(*hdr));
258
259 eid = FIELD_GET(HTC_HDR_ENDPOINTID, hdr->htc_info);
260
261 if (eid >= ATH11K_HTC_EP_COUNT) {
262 ath11k_warn(ab, "HTC Rx: invalid eid %d\n", eid);
263 goto out;
264 }
265
266 ep = &htc->endpoint[eid];
267
268 payload_len = FIELD_GET(HTC_HDR_PAYLOADLEN, hdr->htc_info);
269
270 if (payload_len + sizeof(*hdr) > ATH11K_HTC_MAX_LEN) {
271 ath11k_warn(ab, "HTC rx frame too long, len: %zu\n",
272 payload_len + sizeof(*hdr));
273 goto out;
274 }
275
276 if (skb->len < payload_len) {
277 ath11k_warn(ab, "HTC Rx: insufficient length, got %d, expected %d\n",
278 skb->len, payload_len);
279 goto out;
280 }
281
282 /* get flags to check for trailer */
283 trailer_present = (FIELD_GET(HTC_HDR_FLAGS, hdr->htc_info)) &
284 ATH11K_HTC_FLAG_TRAILER_PRESENT;
285
286 if (trailer_present) {
287 u8 *trailer;
288
289 trailer_len = FIELD_GET(HTC_HDR_CONTROLBYTES0, hdr->ctrl_info);
290 min_len = sizeof(struct ath11k_htc_record_hdr);
291
292 if ((trailer_len < min_len) ||
293 (trailer_len > payload_len)) {
294 ath11k_warn(ab, "Invalid trailer length: %d\n",
295 trailer_len);
296 goto out;
297 }
298
299 trailer = (u8 *)hdr;
300 trailer += sizeof(*hdr);
301 trailer += payload_len;
302 trailer -= trailer_len;
303 status = ath11k_htc_process_trailer(htc, trailer,
304 trailer_len, eid);
305 if (status)
306 goto out;
307
308 skb_trim(skb, skb->len - trailer_len);
309 }
310
311 if (trailer_len >= payload_len)
312 /* zero length packet with trailer data, just drop these */
313 goto out;
314
315 if (eid == ATH11K_HTC_EP_0) {
316 struct ath11k_htc_msg *msg = (struct ath11k_htc_msg *)skb->data;
317
318 switch (FIELD_GET(HTC_MSG_MESSAGEID, msg->msg_svc_id)) {
319 case ATH11K_HTC_MSG_READY_ID:
320 case ATH11K_HTC_MSG_CONNECT_SERVICE_RESP_ID:
321 /* handle HTC control message */
322 if (completion_done(&htc->ctl_resp)) {
323 /* this is a fatal error, target should not be
324 * sending unsolicited messages on the ep 0
325 */
326 ath11k_warn(ab, "HTC rx ctrl still processing\n");
327 complete(&htc->ctl_resp);
328 goto out;
329 }
330
331 htc->control_resp_len =
332 min_t(int, skb->len,
333 ATH11K_HTC_MAX_CTRL_MSG_LEN);
334
335 memcpy(htc->control_resp_buffer, skb->data,
336 htc->control_resp_len);
337
338 complete(&htc->ctl_resp);
339 break;
340 default:
341 ath11k_warn(ab, "ignoring unsolicited htc ep0 event\n");
342 break;
343 }
344 goto out;
345 }
346
347 ath11k_dbg(ab, ATH11K_DBG_HTC, "htc rx completion ep %d skb %pK\n",
348 eid, skb);
349 ep->ep_ops.ep_rx_complete(ab, skb);
350
351 /* poll tx completion for interrupt disabled CE's */
352 ath11k_ce_poll_send_completed(ab, ep->ul_pipe_id);
353
354 /* skb is now owned by the rx completion handler */
355 skb = NULL;
356out:
357 kfree_skb(skb);
358}
359
360static void ath11k_htc_control_rx_complete(struct ath11k_base *ab,
361 struct sk_buff *skb)
362{
363 /* This is unexpected. FW is not supposed to send regular rx on this
364 * endpoint.
365 */
366 ath11k_warn(ab, "unexpected htc rx\n");
367 kfree_skb(skb);
368}
369
370static const char *htc_service_name(enum ath11k_htc_svc_id id)
371{
372 switch (id) {
373 case ATH11K_HTC_SVC_ID_RESERVED:
374 return "Reserved";
375 case ATH11K_HTC_SVC_ID_RSVD_CTRL:
376 return "Control";
377 case ATH11K_HTC_SVC_ID_WMI_CONTROL:
378 return "WMI";
379 case ATH11K_HTC_SVC_ID_WMI_DATA_BE:
380 return "DATA BE";
381 case ATH11K_HTC_SVC_ID_WMI_DATA_BK:
382 return "DATA BK";
383 case ATH11K_HTC_SVC_ID_WMI_DATA_VI:
384 return "DATA VI";
385 case ATH11K_HTC_SVC_ID_WMI_DATA_VO:
386 return "DATA VO";
387 case ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC1:
388 return "WMI MAC1";
389 case ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC2:
390 return "WMI MAC2";
391 case ATH11K_HTC_SVC_ID_NMI_CONTROL:
392 return "NMI Control";
393 case ATH11K_HTC_SVC_ID_NMI_DATA:
394 return "NMI Data";
395 case ATH11K_HTC_SVC_ID_HTT_DATA_MSG:
396 return "HTT Data";
397 case ATH11K_HTC_SVC_ID_TEST_RAW_STREAMS:
398 return "RAW";
399 case ATH11K_HTC_SVC_ID_IPA_TX:
400 return "IPA TX";
401 case ATH11K_HTC_SVC_ID_PKT_LOG:
402 return "PKT LOG";
403 }
404
405 return "Unknown";
406}
407
408static void ath11k_htc_reset_endpoint_states(struct ath11k_htc *htc)
409{
410 struct ath11k_htc_ep *ep;
411 int i;
412
413 for (i = ATH11K_HTC_EP_0; i < ATH11K_HTC_EP_COUNT; i++) {
414 ep = &htc->endpoint[i];
415 ep->service_id = ATH11K_HTC_SVC_ID_UNUSED;
416 ep->max_ep_message_len = 0;
417 ep->max_tx_queue_depth = 0;
418 ep->eid = i;
419 ep->htc = htc;
420 ep->tx_credit_flow_enabled = true;
421 }
422}
423
424static u8 ath11k_htc_get_credit_allocation(struct ath11k_htc *htc,
425 u16 service_id)
426{
427 u8 i, allocation = 0;
428
429 for (i = 0; i < ATH11K_HTC_MAX_SERVICE_ALLOC_ENTRIES; i++) {
430 if (htc->service_alloc_table[i].service_id == service_id) {
431 allocation =
432 htc->service_alloc_table[i].credit_allocation;
433 }
434 }
435
436 return allocation;
437}
438
439static int ath11k_htc_setup_target_buffer_assignments(struct ath11k_htc *htc)
440{
441 struct ath11k_htc_svc_tx_credits *serv_entry;
442 u32 svc_id[] = {
443 ATH11K_HTC_SVC_ID_WMI_CONTROL,
444 ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC1,
445 ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC2,
446 };
447 int i, credits;
448
449 credits = htc->total_transmit_credits;
450 serv_entry = htc->service_alloc_table;
451
452 if ((htc->wmi_ep_count == 0) ||
453 (htc->wmi_ep_count > ARRAY_SIZE(svc_id)))
454 return -EINVAL;
455
456 /* Divide credits among number of endpoints for WMI */
457 credits = credits / htc->wmi_ep_count;
458 for (i = 0; i < htc->wmi_ep_count; i++) {
459 serv_entry[i].service_id = svc_id[i];
460 serv_entry[i].credit_allocation = credits;
461 }
462
463 return 0;
464}
465
466int ath11k_htc_wait_target(struct ath11k_htc *htc)
467{
468 int i, status = 0;
469 struct ath11k_base *ab = htc->ab;
470 unsigned long time_left;
471 struct ath11k_htc_ready *ready;
472 u16 message_id;
473 u16 credit_count;
474 u16 credit_size;
475
476 time_left = wait_for_completion_timeout(&htc->ctl_resp,
477 ATH11K_HTC_WAIT_TIMEOUT_HZ);
478 if (!time_left) {
479 ath11k_warn(ab, "failed to receive control response completion, polling..\n");
480
481 for (i = 0; i < CE_COUNT; i++)
482 ath11k_ce_per_engine_service(htc->ab, i);
483
484 time_left =
485 wait_for_completion_timeout(&htc->ctl_resp,
486 ATH11K_HTC_WAIT_TIMEOUT_HZ);
487
488 if (!time_left)
489 status = -ETIMEDOUT;
490 }
491
492 if (status < 0) {
493 ath11k_warn(ab, "ctl_resp never came in (%d)\n", status);
494 return status;
495 }
496
497 if (htc->control_resp_len < sizeof(*ready)) {
498 ath11k_warn(ab, "Invalid HTC ready msg len:%d\n",
499 htc->control_resp_len);
500 return -ECOMM;
501 }
502
503 ready = (struct ath11k_htc_ready *)htc->control_resp_buffer;
504 message_id = FIELD_GET(HTC_MSG_MESSAGEID, ready->id_credit_count);
505 credit_count = FIELD_GET(HTC_READY_MSG_CREDITCOUNT,
506 ready->id_credit_count);
507 credit_size = FIELD_GET(HTC_READY_MSG_CREDITSIZE, ready->size_ep);
508
509 if (message_id != ATH11K_HTC_MSG_READY_ID) {
510 ath11k_warn(ab, "Invalid HTC ready msg: 0x%x\n", message_id);
511 return -ECOMM;
512 }
513
514 htc->total_transmit_credits = credit_count;
515 htc->target_credit_size = credit_size;
516
517 ath11k_dbg(ab, ATH11K_DBG_HTC,
518 "Target ready! transmit resources: %d size:%d\n",
519 htc->total_transmit_credits, htc->target_credit_size);
520
521 if ((htc->total_transmit_credits == 0) ||
522 (htc->target_credit_size == 0)) {
523 ath11k_warn(ab, "Invalid credit size received\n");
524 return -ECOMM;
525 }
526
527 ath11k_htc_setup_target_buffer_assignments(htc);
528
529 return 0;
530}
531
532int ath11k_htc_connect_service(struct ath11k_htc *htc,
533 struct ath11k_htc_svc_conn_req *conn_req,
534 struct ath11k_htc_svc_conn_resp *conn_resp)
535{
536 struct ath11k_base *ab = htc->ab;
537 struct ath11k_htc_conn_svc *req_msg;
538 struct ath11k_htc_conn_svc_resp resp_msg_dummy;
539 struct ath11k_htc_conn_svc_resp *resp_msg = &resp_msg_dummy;
540 enum ath11k_htc_ep_id assigned_eid = ATH11K_HTC_EP_COUNT;
541 struct ath11k_htc_ep *ep;
542 struct sk_buff *skb;
543 unsigned int max_msg_size = 0;
544 int length, status;
545 unsigned long time_left;
546 bool disable_credit_flow_ctrl = false;
547 u16 message_id, service_id, flags = 0;
548 u8 tx_alloc = 0;
549
550 /* special case for HTC pseudo control service */
551 if (conn_req->service_id == ATH11K_HTC_SVC_ID_RSVD_CTRL) {
552 disable_credit_flow_ctrl = true;
553 assigned_eid = ATH11K_HTC_EP_0;
554 max_msg_size = ATH11K_HTC_MAX_CTRL_MSG_LEN;
555 memset(&resp_msg_dummy, 0, sizeof(resp_msg_dummy));
556 goto setup;
557 }
558
559 tx_alloc = ath11k_htc_get_credit_allocation(htc,
560 conn_req->service_id);
561 if (!tx_alloc)
562 ath11k_dbg(ab, ATH11K_DBG_BOOT,
563 "boot htc service %s does not allocate target credits\n",
564 htc_service_name(conn_req->service_id));
565
566 skb = ath11k_htc_build_tx_ctrl_skb(htc->ab);
567 if (!skb) {
568 ath11k_warn(ab, "Failed to allocate HTC packet\n");
569 return -ENOMEM;
570 }
571
572 length = sizeof(*req_msg);
573 skb_put(skb, length);
574 memset(skb->data, 0, length);
575
576 req_msg = (struct ath11k_htc_conn_svc *)skb->data;
577 req_msg->msg_svc_id = FIELD_PREP(HTC_MSG_MESSAGEID,
578 ATH11K_HTC_MSG_CONNECT_SERVICE_ID);
579
580 flags |= FIELD_PREP(ATH11K_HTC_CONN_FLAGS_RECV_ALLOC, tx_alloc);
581
582 /* Only enable credit flow control for WMI ctrl service */
583 if (!(conn_req->service_id == ATH11K_HTC_SVC_ID_WMI_CONTROL ||
584 conn_req->service_id == ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC1 ||
585 conn_req->service_id == ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC2)) {
586 flags |= ATH11K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL;
587 disable_credit_flow_ctrl = true;
588 }
589
590 req_msg->flags_len = FIELD_PREP(HTC_SVC_MSG_CONNECTIONFLAGS, flags);
591 req_msg->msg_svc_id |= FIELD_PREP(HTC_SVC_MSG_SERVICE_ID,
592 conn_req->service_id);
593
594 reinit_completion(&htc->ctl_resp);
595
596 status = ath11k_htc_send(htc, ATH11K_HTC_EP_0, skb);
597 if (status) {
598 kfree_skb(skb);
599 return status;
600 }
601
602 /* wait for response */
603 time_left = wait_for_completion_timeout(&htc->ctl_resp,
604 ATH11K_HTC_CONN_SVC_TIMEOUT_HZ);
605 if (!time_left) {
606 ath11k_err(ab, "Service connect timeout\n");
607 return -ETIMEDOUT;
608 }
609
610 /* we controlled the buffer creation, it's aligned */
611 resp_msg = (struct ath11k_htc_conn_svc_resp *)htc->control_resp_buffer;
612 message_id = FIELD_GET(HTC_MSG_MESSAGEID, resp_msg->msg_svc_id);
613 service_id = FIELD_GET(HTC_SVC_RESP_MSG_SERVICEID,
614 resp_msg->msg_svc_id);
615
616 if ((message_id != ATH11K_HTC_MSG_CONNECT_SERVICE_RESP_ID) ||
617 (htc->control_resp_len < sizeof(*resp_msg))) {
618 ath11k_err(ab, "Invalid resp message ID 0x%x", message_id);
619 return -EPROTO;
620 }
621
622 ath11k_dbg(ab, ATH11K_DBG_HTC,
623 "HTC Service %s connect response: status: 0x%lx, assigned ep: 0x%lx\n",
624 htc_service_name(service_id),
625 FIELD_GET(HTC_SVC_RESP_MSG_STATUS, resp_msg->flags_len),
626 FIELD_GET(HTC_SVC_RESP_MSG_ENDPOINTID, resp_msg->flags_len));
627
628 conn_resp->connect_resp_code = FIELD_GET(HTC_SVC_RESP_MSG_STATUS,
629 resp_msg->flags_len);
630
631 /* check response status */
632 if (conn_resp->connect_resp_code != ATH11K_HTC_CONN_SVC_STATUS_SUCCESS) {
633 ath11k_err(ab, "HTC Service %s connect request failed: 0x%x)\n",
634 htc_service_name(service_id),
635 conn_resp->connect_resp_code);
636 return -EPROTO;
637 }
638
639 assigned_eid = (enum ath11k_htc_ep_id)FIELD_GET(
640 HTC_SVC_RESP_MSG_ENDPOINTID,
641 resp_msg->flags_len);
642
643 max_msg_size = FIELD_GET(HTC_SVC_RESP_MSG_MAXMSGSIZE,
644 resp_msg->flags_len);
645
646setup:
647
648 if (assigned_eid >= ATH11K_HTC_EP_COUNT)
649 return -EPROTO;
650
651 if (max_msg_size == 0)
652 return -EPROTO;
653
654 ep = &htc->endpoint[assigned_eid];
655 ep->eid = assigned_eid;
656
657 if (ep->service_id != ATH11K_HTC_SVC_ID_UNUSED)
658 return -EPROTO;
659
660 /* return assigned endpoint to caller */
661 conn_resp->eid = assigned_eid;
662 conn_resp->max_msg_len = FIELD_GET(HTC_SVC_RESP_MSG_MAXMSGSIZE,
663 resp_msg->flags_len);
664
665 /* setup the endpoint */
666 ep->service_id = conn_req->service_id;
667 ep->max_tx_queue_depth = conn_req->max_send_queue_depth;
668 ep->max_ep_message_len = FIELD_GET(HTC_SVC_RESP_MSG_MAXMSGSIZE,
669 resp_msg->flags_len);
670 ep->tx_credits = tx_alloc;
671
672 /* copy all the callbacks */
673 ep->ep_ops = conn_req->ep_ops;
674
675 status = ath11k_hif_map_service_to_pipe(htc->ab,
676 ep->service_id,
677 &ep->ul_pipe_id,
678 &ep->dl_pipe_id);
679 if (status)
680 return status;
681
682 ath11k_dbg(ab, ATH11K_DBG_BOOT,
683 "boot htc service '%s' ul pipe %d dl pipe %d eid %d ready\n",
684 htc_service_name(ep->service_id), ep->ul_pipe_id,
685 ep->dl_pipe_id, ep->eid);
686
687 if (disable_credit_flow_ctrl && ep->tx_credit_flow_enabled) {
688 ep->tx_credit_flow_enabled = false;
689 ath11k_dbg(ab, ATH11K_DBG_BOOT,
690 "boot htc service '%s' eid %d TX flow control disabled\n",
691 htc_service_name(ep->service_id), assigned_eid);
692 }
693
694 return status;
695}
696
697int ath11k_htc_start(struct ath11k_htc *htc)
698{
699 struct sk_buff *skb;
700 int status = 0;
701 struct ath11k_base *ab = htc->ab;
702 struct ath11k_htc_setup_complete_extended *msg;
703
704 skb = ath11k_htc_build_tx_ctrl_skb(htc->ab);
705 if (!skb)
706 return -ENOMEM;
707
708 skb_put(skb, sizeof(*msg));
709 memset(skb->data, 0, skb->len);
710
711 msg = (struct ath11k_htc_setup_complete_extended *)skb->data;
712 msg->msg_id = FIELD_PREP(HTC_MSG_MESSAGEID,
713 ATH11K_HTC_MSG_SETUP_COMPLETE_EX_ID);
714
715 ath11k_dbg(ab, ATH11K_DBG_HTC, "HTC is using TX credit flow control\n");
716
717 status = ath11k_htc_send(htc, ATH11K_HTC_EP_0, skb);
718 if (status) {
719 kfree_skb(skb);
720 return status;
721 }
722
723 return 0;
724}
725
726int ath11k_htc_init(struct ath11k_base *ab)
727{
728 struct ath11k_htc *htc = &ab->htc;
729 struct ath11k_htc_svc_conn_req conn_req;
730 struct ath11k_htc_svc_conn_resp conn_resp;
731 int ret;
732
733 spin_lock_init(&htc->tx_lock);
734
735 ath11k_htc_reset_endpoint_states(htc);
736
737 htc->ab = ab;
738
739 switch (ab->wmi_ab.preferred_hw_mode) {
740 case WMI_HOST_HW_MODE_SINGLE:
741 htc->wmi_ep_count = 1;
742 break;
743 case WMI_HOST_HW_MODE_DBS:
744 case WMI_HOST_HW_MODE_DBS_OR_SBS:
745 htc->wmi_ep_count = 2;
746 break;
747 case WMI_HOST_HW_MODE_DBS_SBS:
748 htc->wmi_ep_count = 3;
749 break;
750 default:
751 htc->wmi_ep_count = 3;
752 break;
753 }
754
755 /* setup our pseudo HTC control endpoint connection */
756 memset(&conn_req, 0, sizeof(conn_req));
757 memset(&conn_resp, 0, sizeof(conn_resp));
758 conn_req.ep_ops.ep_tx_complete = ath11k_htc_control_tx_complete;
759 conn_req.ep_ops.ep_rx_complete = ath11k_htc_control_rx_complete;
760 conn_req.max_send_queue_depth = ATH11K_NUM_CONTROL_TX_BUFFERS;
761 conn_req.service_id = ATH11K_HTC_SVC_ID_RSVD_CTRL;
762
763 /* connect fake service */
764 ret = ath11k_htc_connect_service(htc, &conn_req, &conn_resp);
765 if (ret) {
766 ath11k_err(ab, "could not connect to htc service (%d)\n", ret);
767 return ret;
768 }
769
770 init_completion(&htc->ctl_resp);
771
772 return 0;
773}