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1// SPDX-License-Identifier: ISC2/*3 * Copyright (c) 2005-2011 Atheros Communications Inc.4 * Copyright (c) 2011-2017 Qualcomm Atheros, Inc.5 * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.6 */7 8#include "core.h"9#include "hif.h"10#include "debug.h"11 12/********/13/* Send */14/********/15 16static void ath10k_htc_control_tx_complete(struct ath10k *ar,17 struct sk_buff *skb)18{19 kfree_skb(skb);20}21 22static struct sk_buff *ath10k_htc_build_tx_ctrl_skb(void *ar)23{24 struct sk_buff *skb;25 struct ath10k_skb_cb *skb_cb;26 27 skb = dev_alloc_skb(ATH10K_HTC_CONTROL_BUFFER_SIZE);28 if (!skb)29 return NULL;30 31 skb_reserve(skb, 20); /* FIXME: why 20 bytes? */32 WARN_ONCE((unsigned long)skb->data & 3, "unaligned skb");33 34 skb_cb = ATH10K_SKB_CB(skb);35 memset(skb_cb, 0, sizeof(*skb_cb));36 37 ath10k_dbg(ar, ATH10K_DBG_HTC, "%s: skb %pK\n", __func__, skb);38 return skb;39}40 41static inline void ath10k_htc_restore_tx_skb(struct ath10k_htc *htc,42 struct sk_buff *skb)43{44 struct ath10k_skb_cb *skb_cb = ATH10K_SKB_CB(skb);45 46 if (htc->ar->bus_param.dev_type != ATH10K_DEV_TYPE_HL)47 dma_unmap_single(htc->ar->dev, skb_cb->paddr, skb->len, DMA_TO_DEVICE);48 skb_pull(skb, sizeof(struct ath10k_htc_hdr));49}50 51void ath10k_htc_notify_tx_completion(struct ath10k_htc_ep *ep,52 struct sk_buff *skb)53{54 struct ath10k *ar = ep->htc->ar;55 struct ath10k_htc_hdr *hdr;56 57 ath10k_dbg(ar, ATH10K_DBG_HTC, "%s: ep %d skb %pK\n", __func__,58 ep->eid, skb);59 60 /* A corner case where the copy completion is reaching to host but still61 * copy engine is processing it due to which host unmaps corresponding62 * memory and causes SMMU fault, hence as workaround adding delay63 * the unmapping memory to avoid SMMU faults.64 */65 if (ar->hw_params.delay_unmap_buffer &&66 ep->ul_pipe_id == 3)67 mdelay(2);68 69 hdr = (struct ath10k_htc_hdr *)skb->data;70 ath10k_htc_restore_tx_skb(ep->htc, skb);71 72 if (!ep->ep_ops.ep_tx_complete) {73 ath10k_warn(ar, "no tx handler for eid %d\n", ep->eid);74 dev_kfree_skb_any(skb);75 return;76 }77 78 if (hdr->flags & ATH10K_HTC_FLAG_SEND_BUNDLE) {79 dev_kfree_skb_any(skb);80 return;81 }82 83 ep->ep_ops.ep_tx_complete(ep->htc->ar, skb);84}85EXPORT_SYMBOL(ath10k_htc_notify_tx_completion);86 87static void ath10k_htc_prepare_tx_skb(struct ath10k_htc_ep *ep,88 struct sk_buff *skb)89{90 struct ath10k_htc_hdr *hdr;91 92 hdr = (struct ath10k_htc_hdr *)skb->data;93 memset(hdr, 0, sizeof(struct ath10k_htc_hdr));94 95 hdr->eid = ep->eid;96 hdr->len = __cpu_to_le16(skb->len - sizeof(*hdr));97 hdr->flags = 0;98 if (ep->tx_credit_flow_enabled && !ep->bundle_tx)99 hdr->flags |= ATH10K_HTC_FLAG_NEED_CREDIT_UPDATE;100 101 spin_lock_bh(&ep->htc->tx_lock);102 hdr->seq_no = ep->seq_no++;103 spin_unlock_bh(&ep->htc->tx_lock);104}105 106static int ath10k_htc_consume_credit(struct ath10k_htc_ep *ep,107 unsigned int len,108 bool consume)109{110 struct ath10k_htc *htc = ep->htc;111 struct ath10k *ar = htc->ar;112 enum ath10k_htc_ep_id eid = ep->eid;113 int credits, ret = 0;114 115 if (!ep->tx_credit_flow_enabled)116 return 0;117 118 credits = DIV_ROUND_UP(len, ep->tx_credit_size);119 spin_lock_bh(&htc->tx_lock);120 121 if (ep->tx_credits < credits) {122 ath10k_dbg(ar, ATH10K_DBG_HTC,123 "htc insufficient credits ep %d required %d available %d consume %d\n",124 eid, credits, ep->tx_credits, consume);125 ret = -EAGAIN;126 goto unlock;127 }128 129 if (consume) {130 ep->tx_credits -= credits;131 ath10k_dbg(ar, ATH10K_DBG_HTC,132 "htc ep %d consumed %d credits total %d\n",133 eid, credits, ep->tx_credits);134 }135 136unlock:137 spin_unlock_bh(&htc->tx_lock);138 return ret;139}140 141static void ath10k_htc_release_credit(struct ath10k_htc_ep *ep, unsigned int len)142{143 struct ath10k_htc *htc = ep->htc;144 struct ath10k *ar = htc->ar;145 enum ath10k_htc_ep_id eid = ep->eid;146 int credits;147 148 if (!ep->tx_credit_flow_enabled)149 return;150 151 credits = DIV_ROUND_UP(len, ep->tx_credit_size);152 spin_lock_bh(&htc->tx_lock);153 ep->tx_credits += credits;154 ath10k_dbg(ar, ATH10K_DBG_HTC,155 "htc ep %d reverted %d credits back total %d\n",156 eid, credits, ep->tx_credits);157 spin_unlock_bh(&htc->tx_lock);158 159 if (ep->ep_ops.ep_tx_credits)160 ep->ep_ops.ep_tx_credits(htc->ar);161}162 163int ath10k_htc_send(struct ath10k_htc *htc,164 enum ath10k_htc_ep_id eid,165 struct sk_buff *skb)166{167 struct ath10k *ar = htc->ar;168 struct ath10k_htc_ep *ep = &htc->endpoint[eid];169 struct ath10k_skb_cb *skb_cb = ATH10K_SKB_CB(skb);170 struct ath10k_hif_sg_item sg_item;171 struct device *dev = htc->ar->dev;172 int ret;173 unsigned int skb_len;174 175 if (htc->ar->state == ATH10K_STATE_WEDGED)176 return -ECOMM;177 178 if (eid >= ATH10K_HTC_EP_COUNT) {179 ath10k_warn(ar, "Invalid endpoint id: %d\n", eid);180 return -ENOENT;181 }182 183 skb_push(skb, sizeof(struct ath10k_htc_hdr));184 185 skb_len = skb->len;186 ret = ath10k_htc_consume_credit(ep, skb_len, true);187 if (ret)188 goto err_pull;189 190 ath10k_htc_prepare_tx_skb(ep, skb);191 192 skb_cb->eid = eid;193 if (ar->bus_param.dev_type != ATH10K_DEV_TYPE_HL) {194 skb_cb->paddr = dma_map_single(dev, skb->data, skb->len,195 DMA_TO_DEVICE);196 ret = dma_mapping_error(dev, skb_cb->paddr);197 if (ret) {198 ret = -EIO;199 goto err_credits;200 }201 }202 203 sg_item.transfer_id = ep->eid;204 sg_item.transfer_context = skb;205 sg_item.vaddr = skb->data;206 sg_item.paddr = skb_cb->paddr;207 sg_item.len = skb->len;208 209 ret = ath10k_hif_tx_sg(htc->ar, ep->ul_pipe_id, &sg_item, 1);210 if (ret)211 goto err_unmap;212 213 return 0;214 215err_unmap:216 if (ar->bus_param.dev_type != ATH10K_DEV_TYPE_HL)217 dma_unmap_single(dev, skb_cb->paddr, skb->len, DMA_TO_DEVICE);218err_credits:219 ath10k_htc_release_credit(ep, skb_len);220err_pull:221 skb_pull(skb, sizeof(struct ath10k_htc_hdr));222 return ret;223}224 225void ath10k_htc_tx_completion_handler(struct ath10k *ar, struct sk_buff *skb)226{227 struct ath10k_htc *htc = &ar->htc;228 struct ath10k_skb_cb *skb_cb;229 struct ath10k_htc_ep *ep;230 231 if (WARN_ON_ONCE(!skb))232 return;233 234 skb_cb = ATH10K_SKB_CB(skb);235 ep = &htc->endpoint[skb_cb->eid];236 237 ath10k_htc_notify_tx_completion(ep, skb);238 /* the skb now belongs to the completion handler */239}240EXPORT_SYMBOL(ath10k_htc_tx_completion_handler);241 242/***********/243/* Receive */244/***********/245 246static void247ath10k_htc_process_credit_report(struct ath10k_htc *htc,248 const struct ath10k_htc_credit_report *report,249 int len,250 enum ath10k_htc_ep_id eid)251{252 struct ath10k *ar = htc->ar;253 struct ath10k_htc_ep *ep;254 int i, n_reports;255 256 if (len % sizeof(*report))257 ath10k_warn(ar, "Uneven credit report len %d", len);258 259 n_reports = len / sizeof(*report);260 261 spin_lock_bh(&htc->tx_lock);262 for (i = 0; i < n_reports; i++, report++) {263 if (report->eid >= ATH10K_HTC_EP_COUNT)264 break;265 266 ep = &htc->endpoint[report->eid];267 ep->tx_credits += report->credits;268 269 ath10k_dbg(ar, ATH10K_DBG_HTC, "htc ep %d got %d credits (total %d)\n",270 report->eid, report->credits, ep->tx_credits);271 272 if (ep->ep_ops.ep_tx_credits) {273 spin_unlock_bh(&htc->tx_lock);274 ep->ep_ops.ep_tx_credits(htc->ar);275 spin_lock_bh(&htc->tx_lock);276 }277 }278 spin_unlock_bh(&htc->tx_lock);279}280 281static int282ath10k_htc_process_lookahead(struct ath10k_htc *htc,283 const struct ath10k_htc_lookahead_report *report,284 int len,285 enum ath10k_htc_ep_id eid,286 void *next_lookaheads,287 int *next_lookaheads_len)288{289 struct ath10k *ar = htc->ar;290 291 /* Invalid lookahead flags are actually transmitted by292 * the target in the HTC control message.293 * Since this will happen at every boot we silently ignore294 * the lookahead in this case295 */296 if (report->pre_valid != ((~report->post_valid) & 0xFF))297 return 0;298 299 if (next_lookaheads && next_lookaheads_len) {300 ath10k_dbg(ar, ATH10K_DBG_HTC,301 "htc rx lookahead found pre_valid 0x%x post_valid 0x%x\n",302 report->pre_valid, report->post_valid);303 304 /* look ahead bytes are valid, copy them over */305 memcpy((u8 *)next_lookaheads, report->lookahead, 4);306 307 *next_lookaheads_len = 1;308 }309 310 return 0;311}312 313static int314ath10k_htc_process_lookahead_bundle(struct ath10k_htc *htc,315 const struct ath10k_htc_lookahead_bundle *report,316 int len,317 enum ath10k_htc_ep_id eid,318 void *next_lookaheads,319 int *next_lookaheads_len)320{321 struct ath10k *ar = htc->ar;322 int bundle_cnt = len / sizeof(*report);323 324 if (!bundle_cnt || (bundle_cnt > htc->max_msgs_per_htc_bundle)) {325 ath10k_warn(ar, "Invalid lookahead bundle count: %d\n",326 bundle_cnt);327 return -EINVAL;328 }329 330 if (next_lookaheads && next_lookaheads_len) {331 int i;332 333 for (i = 0; i < bundle_cnt; i++) {334 memcpy(((u8 *)next_lookaheads) + 4 * i,335 report->lookahead, 4);336 report++;337 }338 339 *next_lookaheads_len = bundle_cnt;340 }341 342 return 0;343}344 345int ath10k_htc_process_trailer(struct ath10k_htc *htc,346 u8 *buffer,347 int length,348 enum ath10k_htc_ep_id src_eid,349 void *next_lookaheads,350 int *next_lookaheads_len)351{352 struct ath10k_htc_lookahead_bundle *bundle;353 struct ath10k *ar = htc->ar;354 int status = 0;355 struct ath10k_htc_record *record;356 u8 *orig_buffer;357 int orig_length;358 size_t len;359 360 orig_buffer = buffer;361 orig_length = length;362 363 while (length > 0) {364 record = (struct ath10k_htc_record *)buffer;365 366 if (length < sizeof(record->hdr)) {367 status = -EINVAL;368 break;369 }370 371 if (record->hdr.len > length) {372 /* no room left in buffer for record */373 ath10k_warn(ar, "Invalid record length: %d\n",374 record->hdr.len);375 status = -EINVAL;376 break;377 }378 379 switch (record->hdr.id) {380 case ATH10K_HTC_RECORD_CREDITS:381 len = sizeof(struct ath10k_htc_credit_report);382 if (record->hdr.len < len) {383 ath10k_warn(ar, "Credit report too long\n");384 status = -EINVAL;385 break;386 }387 ath10k_htc_process_credit_report(htc,388 record->credit_report,389 record->hdr.len,390 src_eid);391 break;392 case ATH10K_HTC_RECORD_LOOKAHEAD:393 len = sizeof(struct ath10k_htc_lookahead_report);394 if (record->hdr.len < len) {395 ath10k_warn(ar, "Lookahead report too long\n");396 status = -EINVAL;397 break;398 }399 status = ath10k_htc_process_lookahead(htc,400 record->lookahead_report,401 record->hdr.len,402 src_eid,403 next_lookaheads,404 next_lookaheads_len);405 break;406 case ATH10K_HTC_RECORD_LOOKAHEAD_BUNDLE:407 bundle = record->lookahead_bundle;408 status = ath10k_htc_process_lookahead_bundle(htc,409 bundle,410 record->hdr.len,411 src_eid,412 next_lookaheads,413 next_lookaheads_len);414 break;415 default:416 ath10k_warn(ar, "Unhandled record: id:%d length:%d\n",417 record->hdr.id, record->hdr.len);418 break;419 }420 421 if (status)422 break;423 424 /* multiple records may be present in a trailer */425 buffer += sizeof(record->hdr) + record->hdr.len;426 length -= sizeof(record->hdr) + record->hdr.len;427 }428 429 if (status)430 ath10k_dbg_dump(ar, ATH10K_DBG_HTC, "htc rx bad trailer", "",431 orig_buffer, orig_length);432 433 return status;434}435EXPORT_SYMBOL(ath10k_htc_process_trailer);436 437void ath10k_htc_rx_completion_handler(struct ath10k *ar, struct sk_buff *skb)438{439 int status = 0;440 struct ath10k_htc *htc = &ar->htc;441 struct ath10k_htc_hdr *hdr;442 struct ath10k_htc_ep *ep;443 u16 payload_len;444 u32 trailer_len = 0;445 size_t min_len;446 u8 eid;447 bool trailer_present;448 449 hdr = (struct ath10k_htc_hdr *)skb->data;450 skb_pull(skb, sizeof(*hdr));451 452 eid = hdr->eid;453 454 if (eid >= ATH10K_HTC_EP_COUNT) {455 ath10k_warn(ar, "HTC Rx: invalid eid %d\n", eid);456 ath10k_dbg_dump(ar, ATH10K_DBG_HTC, "htc bad header", "",457 hdr, sizeof(*hdr));458 goto out;459 }460 461 ep = &htc->endpoint[eid];462 if (ep->service_id == ATH10K_HTC_SVC_ID_UNUSED) {463 ath10k_warn(ar, "htc rx endpoint %d is not connected\n", eid);464 goto out;465 }466 467 payload_len = __le16_to_cpu(hdr->len);468 469 if (payload_len + sizeof(*hdr) > ATH10K_HTC_MAX_LEN) {470 ath10k_warn(ar, "HTC rx frame too long, len: %zu\n",471 payload_len + sizeof(*hdr));472 ath10k_dbg_dump(ar, ATH10K_DBG_HTC, "htc bad rx pkt len", "",473 hdr, sizeof(*hdr));474 goto out;475 }476 477 if (skb->len < payload_len) {478 ath10k_dbg(ar, ATH10K_DBG_HTC,479 "HTC Rx: insufficient length, got %d, expected %d\n",480 skb->len, payload_len);481 ath10k_dbg_dump(ar, ATH10K_DBG_HTC, "htc bad rx pkt len",482 "", hdr, sizeof(*hdr));483 goto out;484 }485 486 /* get flags to check for trailer */487 trailer_present = hdr->flags & ATH10K_HTC_FLAG_TRAILER_PRESENT;488 if (trailer_present) {489 u8 *trailer;490 491 trailer_len = hdr->trailer_len;492 min_len = sizeof(struct ath10k_ath10k_htc_record_hdr);493 494 if ((trailer_len < min_len) ||495 (trailer_len > payload_len)) {496 ath10k_warn(ar, "Invalid trailer length: %d\n",497 trailer_len);498 goto out;499 }500 501 trailer = (u8 *)hdr;502 trailer += sizeof(*hdr);503 trailer += payload_len;504 trailer -= trailer_len;505 status = ath10k_htc_process_trailer(htc, trailer,506 trailer_len, hdr->eid,507 NULL, NULL);508 if (status)509 goto out;510 511 skb_trim(skb, skb->len - trailer_len);512 }513 514 if (((int)payload_len - (int)trailer_len) <= 0)515 /* zero length packet with trailer data, just drop these */516 goto out;517 518 ath10k_dbg(ar, ATH10K_DBG_HTC, "htc rx completion ep %d skb %pK\n",519 eid, skb);520 ep->ep_ops.ep_rx_complete(ar, skb);521 522 /* skb is now owned by the rx completion handler */523 skb = NULL;524out:525 kfree_skb(skb);526}527EXPORT_SYMBOL(ath10k_htc_rx_completion_handler);528 529static void ath10k_htc_control_rx_complete(struct ath10k *ar,530 struct sk_buff *skb)531{532 struct ath10k_htc *htc = &ar->htc;533 struct ath10k_htc_msg *msg = (struct ath10k_htc_msg *)skb->data;534 535 switch (__le16_to_cpu(msg->hdr.message_id)) {536 case ATH10K_HTC_MSG_READY_ID:537 case ATH10K_HTC_MSG_CONNECT_SERVICE_RESP_ID:538 /* handle HTC control message */539 if (completion_done(&htc->ctl_resp)) {540 /* this is a fatal error, target should not be541 * sending unsolicited messages on the ep 0542 */543 ath10k_warn(ar, "HTC rx ctrl still processing\n");544 complete(&htc->ctl_resp);545 goto out;546 }547 548 htc->control_resp_len =549 min_t(int, skb->len,550 ATH10K_HTC_MAX_CTRL_MSG_LEN);551 552 memcpy(htc->control_resp_buffer, skb->data,553 htc->control_resp_len);554 555 complete(&htc->ctl_resp);556 break;557 case ATH10K_HTC_MSG_SEND_SUSPEND_COMPLETE:558 htc->htc_ops.target_send_suspend_complete(ar);559 break;560 default:561 ath10k_warn(ar, "ignoring unsolicited htc ep0 event\n");562 break;563 }564 565out:566 kfree_skb(skb);567}568 569/***************/570/* Init/Deinit */571/***************/572 573static const char *htc_service_name(enum ath10k_htc_svc_id id)574{575 switch (id) {576 case ATH10K_HTC_SVC_ID_RESERVED:577 return "Reserved";578 case ATH10K_HTC_SVC_ID_RSVD_CTRL:579 return "Control";580 case ATH10K_HTC_SVC_ID_WMI_CONTROL:581 return "WMI";582 case ATH10K_HTC_SVC_ID_WMI_DATA_BE:583 return "DATA BE";584 case ATH10K_HTC_SVC_ID_WMI_DATA_BK:585 return "DATA BK";586 case ATH10K_HTC_SVC_ID_WMI_DATA_VI:587 return "DATA VI";588 case ATH10K_HTC_SVC_ID_WMI_DATA_VO:589 return "DATA VO";590 case ATH10K_HTC_SVC_ID_NMI_CONTROL:591 return "NMI Control";592 case ATH10K_HTC_SVC_ID_NMI_DATA:593 return "NMI Data";594 case ATH10K_HTC_SVC_ID_HTT_DATA_MSG:595 return "HTT Data";596 case ATH10K_HTC_SVC_ID_HTT_DATA2_MSG:597 return "HTT Data";598 case ATH10K_HTC_SVC_ID_HTT_DATA3_MSG:599 return "HTT Data";600 case ATH10K_HTC_SVC_ID_TEST_RAW_STREAMS:601 return "RAW";602 case ATH10K_HTC_SVC_ID_HTT_LOG_MSG:603 return "PKTLOG";604 }605 606 return "Unknown";607}608 609static void ath10k_htc_reset_endpoint_states(struct ath10k_htc *htc)610{611 struct ath10k_htc_ep *ep;612 int i;613 614 for (i = ATH10K_HTC_EP_0; i < ATH10K_HTC_EP_COUNT; i++) {615 ep = &htc->endpoint[i];616 ep->service_id = ATH10K_HTC_SVC_ID_UNUSED;617 ep->max_ep_message_len = 0;618 ep->max_tx_queue_depth = 0;619 ep->eid = i;620 ep->htc = htc;621 ep->tx_credit_flow_enabled = true;622 }623}624 625static u8 ath10k_htc_get_credit_allocation(struct ath10k_htc *htc,626 u16 service_id)627{628 u8 allocation = 0;629 630 /* The WMI control service is the only service with flow control.631 * Let it have all transmit credits.632 */633 if (service_id == ATH10K_HTC_SVC_ID_WMI_CONTROL)634 allocation = htc->total_transmit_credits;635 636 return allocation;637}638 639static int ath10k_htc_send_bundle(struct ath10k_htc_ep *ep,640 struct sk_buff *bundle_skb,641 struct sk_buff_head *tx_save_head)642{643 struct ath10k_hif_sg_item sg_item;644 struct ath10k_htc *htc = ep->htc;645 struct ath10k *ar = htc->ar;646 struct sk_buff *skb;647 int ret, cn = 0;648 unsigned int skb_len;649 650 ath10k_dbg(ar, ATH10K_DBG_HTC, "bundle skb len %d\n", bundle_skb->len);651 skb_len = bundle_skb->len;652 ret = ath10k_htc_consume_credit(ep, skb_len, true);653 654 if (!ret) {655 sg_item.transfer_id = ep->eid;656 sg_item.transfer_context = bundle_skb;657 sg_item.vaddr = bundle_skb->data;658 sg_item.len = bundle_skb->len;659 660 ret = ath10k_hif_tx_sg(htc->ar, ep->ul_pipe_id, &sg_item, 1);661 if (ret)662 ath10k_htc_release_credit(ep, skb_len);663 }664 665 if (ret)666 dev_kfree_skb_any(bundle_skb);667 668 for (cn = 0; (skb = skb_dequeue_tail(tx_save_head)); cn++) {669 if (ret) {670 skb_pull(skb, sizeof(struct ath10k_htc_hdr));671 skb_queue_head(&ep->tx_req_head, skb);672 } else {673 skb_queue_tail(&ep->tx_complete_head, skb);674 }675 }676 677 if (!ret)678 queue_work(ar->workqueue_tx_complete, &ar->tx_complete_work);679 680 ath10k_dbg(ar, ATH10K_DBG_HTC,681 "bundle tx status %d eid %d req count %d count %d len %d\n",682 ret, ep->eid, skb_queue_len(&ep->tx_req_head), cn, skb_len);683 return ret;684}685 686static void ath10k_htc_send_one_skb(struct ath10k_htc_ep *ep, struct sk_buff *skb)687{688 struct ath10k_htc *htc = ep->htc;689 struct ath10k *ar = htc->ar;690 int ret;691 692 ret = ath10k_htc_send(htc, ep->eid, skb);693 694 if (ret)695 skb_queue_head(&ep->tx_req_head, skb);696 697 ath10k_dbg(ar, ATH10K_DBG_HTC, "tx one status %d eid %d len %d pending count %d\n",698 ret, ep->eid, skb->len, skb_queue_len(&ep->tx_req_head));699}700 701static int ath10k_htc_send_bundle_skbs(struct ath10k_htc_ep *ep)702{703 struct ath10k_htc *htc = ep->htc;704 struct sk_buff *bundle_skb, *skb;705 struct sk_buff_head tx_save_head;706 struct ath10k_htc_hdr *hdr;707 u8 *bundle_buf;708 int ret = 0, credit_pad, credit_remainder, trans_len, bundles_left = 0;709 710 if (htc->ar->state == ATH10K_STATE_WEDGED)711 return -ECOMM;712 713 if (ep->tx_credit_flow_enabled &&714 ep->tx_credits < ATH10K_MIN_CREDIT_PER_HTC_TX_BUNDLE)715 return 0;716 717 bundles_left = ATH10K_MAX_MSG_PER_HTC_TX_BUNDLE * ep->tx_credit_size;718 bundle_skb = dev_alloc_skb(bundles_left);719 720 if (!bundle_skb)721 return -ENOMEM;722 723 bundle_buf = bundle_skb->data;724 skb_queue_head_init(&tx_save_head);725 726 while (true) {727 skb = skb_dequeue(&ep->tx_req_head);728 if (!skb)729 break;730 731 credit_pad = 0;732 trans_len = skb->len + sizeof(*hdr);733 credit_remainder = trans_len % ep->tx_credit_size;734 735 if (credit_remainder != 0) {736 credit_pad = ep->tx_credit_size - credit_remainder;737 trans_len += credit_pad;738 }739 740 ret = ath10k_htc_consume_credit(ep,741 bundle_buf + trans_len - bundle_skb->data,742 false);743 if (ret) {744 skb_queue_head(&ep->tx_req_head, skb);745 break;746 }747 748 if (bundles_left < trans_len) {749 bundle_skb->len = bundle_buf - bundle_skb->data;750 ret = ath10k_htc_send_bundle(ep, bundle_skb, &tx_save_head);751 752 if (ret) {753 skb_queue_head(&ep->tx_req_head, skb);754 return ret;755 }756 757 if (skb_queue_len(&ep->tx_req_head) == 0) {758 ath10k_htc_send_one_skb(ep, skb);759 return ret;760 }761 762 if (ep->tx_credit_flow_enabled &&763 ep->tx_credits < ATH10K_MIN_CREDIT_PER_HTC_TX_BUNDLE) {764 skb_queue_head(&ep->tx_req_head, skb);765 return 0;766 }767 768 bundles_left =769 ATH10K_MAX_MSG_PER_HTC_TX_BUNDLE * ep->tx_credit_size;770 bundle_skb = dev_alloc_skb(bundles_left);771 772 if (!bundle_skb) {773 skb_queue_head(&ep->tx_req_head, skb);774 return -ENOMEM;775 }776 bundle_buf = bundle_skb->data;777 skb_queue_head_init(&tx_save_head);778 }779 780 skb_push(skb, sizeof(struct ath10k_htc_hdr));781 ath10k_htc_prepare_tx_skb(ep, skb);782 783 memcpy(bundle_buf, skb->data, skb->len);784 hdr = (struct ath10k_htc_hdr *)bundle_buf;785 hdr->flags |= ATH10K_HTC_FLAG_SEND_BUNDLE;786 hdr->pad_len = __cpu_to_le16(credit_pad);787 bundle_buf += trans_len;788 bundles_left -= trans_len;789 skb_queue_tail(&tx_save_head, skb);790 }791 792 if (bundle_buf != bundle_skb->data) {793 bundle_skb->len = bundle_buf - bundle_skb->data;794 ret = ath10k_htc_send_bundle(ep, bundle_skb, &tx_save_head);795 } else {796 dev_kfree_skb_any(bundle_skb);797 }798 799 return ret;800}801 802static void ath10k_htc_bundle_tx_work(struct work_struct *work)803{804 struct ath10k *ar = container_of(work, struct ath10k, bundle_tx_work);805 struct ath10k_htc_ep *ep;806 struct sk_buff *skb;807 int i;808 809 for (i = 0; i < ARRAY_SIZE(ar->htc.endpoint); i++) {810 ep = &ar->htc.endpoint[i];811 812 if (!ep->bundle_tx)813 continue;814 815 ath10k_dbg(ar, ATH10K_DBG_HTC, "bundle tx work eid %d count %d\n",816 ep->eid, skb_queue_len(&ep->tx_req_head));817 818 if (skb_queue_len(&ep->tx_req_head) >=819 ATH10K_MIN_MSG_PER_HTC_TX_BUNDLE) {820 ath10k_htc_send_bundle_skbs(ep);821 } else {822 skb = skb_dequeue(&ep->tx_req_head);823 824 if (!skb)825 continue;826 ath10k_htc_send_one_skb(ep, skb);827 }828 }829}830 831static void ath10k_htc_tx_complete_work(struct work_struct *work)832{833 struct ath10k *ar = container_of(work, struct ath10k, tx_complete_work);834 struct ath10k_htc_ep *ep;835 enum ath10k_htc_ep_id eid;836 struct sk_buff *skb;837 int i;838 839 for (i = 0; i < ARRAY_SIZE(ar->htc.endpoint); i++) {840 ep = &ar->htc.endpoint[i];841 eid = ep->eid;842 if (ep->bundle_tx && eid == ar->htt.eid) {843 ath10k_dbg(ar, ATH10K_DBG_HTC, "bundle tx complete eid %d pending complete count%d\n",844 ep->eid, skb_queue_len(&ep->tx_complete_head));845 846 while (true) {847 skb = skb_dequeue(&ep->tx_complete_head);848 if (!skb)849 break;850 ath10k_htc_notify_tx_completion(ep, skb);851 }852 }853 }854}855 856int ath10k_htc_send_hl(struct ath10k_htc *htc,857 enum ath10k_htc_ep_id eid,858 struct sk_buff *skb)859{860 struct ath10k_htc_ep *ep = &htc->endpoint[eid];861 struct ath10k *ar = htc->ar;862 863 if (sizeof(struct ath10k_htc_hdr) + skb->len > ep->tx_credit_size) {864 ath10k_dbg(ar, ATH10K_DBG_HTC, "tx exceed max len %d\n", skb->len);865 return -ENOMEM;866 }867 868 ath10k_dbg(ar, ATH10K_DBG_HTC, "htc send hl eid %d bundle %d tx count %d len %d\n",869 eid, ep->bundle_tx, skb_queue_len(&ep->tx_req_head), skb->len);870 871 if (ep->bundle_tx) {872 skb_queue_tail(&ep->tx_req_head, skb);873 queue_work(ar->workqueue, &ar->bundle_tx_work);874 return 0;875 } else {876 return ath10k_htc_send(htc, eid, skb);877 }878}879 880void ath10k_htc_setup_tx_req(struct ath10k_htc_ep *ep)881{882 if (ep->htc->max_msgs_per_htc_bundle >= ATH10K_MIN_MSG_PER_HTC_TX_BUNDLE &&883 !ep->bundle_tx) {884 ep->bundle_tx = true;885 skb_queue_head_init(&ep->tx_req_head);886 skb_queue_head_init(&ep->tx_complete_head);887 }888}889 890void ath10k_htc_stop_hl(struct ath10k *ar)891{892 struct ath10k_htc_ep *ep;893 int i;894 895 cancel_work_sync(&ar->bundle_tx_work);896 cancel_work_sync(&ar->tx_complete_work);897 898 for (i = 0; i < ARRAY_SIZE(ar->htc.endpoint); i++) {899 ep = &ar->htc.endpoint[i];900 901 if (!ep->bundle_tx)902 continue;903 904 ath10k_dbg(ar, ATH10K_DBG_HTC, "stop tx work eid %d count %d\n",905 ep->eid, skb_queue_len(&ep->tx_req_head));906 907 skb_queue_purge(&ep->tx_req_head);908 }909}910 911int ath10k_htc_wait_target(struct ath10k_htc *htc)912{913 struct ath10k *ar = htc->ar;914 int i, status = 0;915 unsigned long time_left;916 struct ath10k_htc_msg *msg;917 u16 message_id;918 919 time_left = wait_for_completion_timeout(&htc->ctl_resp,920 ATH10K_HTC_WAIT_TIMEOUT_HZ);921 if (!time_left) {922 /* Workaround: In some cases the PCI HIF doesn't923 * receive interrupt for the control response message924 * even if the buffer was completed. It is suspected925 * iomap writes unmasking PCI CE irqs aren't propagated926 * properly in KVM PCI-passthrough sometimes.927 */928 ath10k_warn(ar, "failed to receive control response completion, polling..\n");929 930 for (i = 0; i < CE_COUNT; i++)931 ath10k_hif_send_complete_check(htc->ar, i, 1);932 933 time_left =934 wait_for_completion_timeout(&htc->ctl_resp,935 ATH10K_HTC_WAIT_TIMEOUT_HZ);936 937 if (!time_left)938 status = -ETIMEDOUT;939 }940 941 if (status < 0) {942 ath10k_err(ar, "ctl_resp never came in (%d)\n", status);943 return status;944 }945 946 if (htc->control_resp_len < sizeof(msg->hdr) + sizeof(msg->ready)) {947 ath10k_err(ar, "Invalid HTC ready msg len:%d\n",948 htc->control_resp_len);949 return -ECOMM;950 }951 952 msg = (struct ath10k_htc_msg *)htc->control_resp_buffer;953 message_id = __le16_to_cpu(msg->hdr.message_id);954 955 if (message_id != ATH10K_HTC_MSG_READY_ID) {956 ath10k_err(ar, "Invalid HTC ready msg: 0x%x\n", message_id);957 return -ECOMM;958 }959 960 if (ar->hw_params.use_fw_tx_credits)961 htc->total_transmit_credits = __le16_to_cpu(msg->ready.credit_count);962 else963 htc->total_transmit_credits = 1;964 965 htc->target_credit_size = __le16_to_cpu(msg->ready.credit_size);966 967 ath10k_dbg(ar, ATH10K_DBG_HTC,968 "Target ready! transmit resources: %d size:%d actual credits:%d\n",969 htc->total_transmit_credits,970 htc->target_credit_size,971 msg->ready.credit_count);972 973 if ((htc->total_transmit_credits == 0) ||974 (htc->target_credit_size == 0)) {975 ath10k_err(ar, "Invalid credit size received\n");976 return -ECOMM;977 }978 979 /* The only way to determine if the ready message is an extended980 * message is from the size.981 */982 if (htc->control_resp_len >=983 sizeof(msg->hdr) + sizeof(msg->ready_ext)) {984 htc->alt_data_credit_size =985 __le16_to_cpu(msg->ready_ext.reserved) &986 ATH10K_HTC_MSG_READY_EXT_ALT_DATA_MASK;987 htc->max_msgs_per_htc_bundle =988 min_t(u8, msg->ready_ext.max_msgs_per_htc_bundle,989 HTC_HOST_MAX_MSG_PER_RX_BUNDLE);990 ath10k_dbg(ar, ATH10K_DBG_HTC,991 "Extended ready message RX bundle size %d alt size %d\n",992 htc->max_msgs_per_htc_bundle,993 htc->alt_data_credit_size);994 }995 996 INIT_WORK(&ar->bundle_tx_work, ath10k_htc_bundle_tx_work);997 INIT_WORK(&ar->tx_complete_work, ath10k_htc_tx_complete_work);998 999 return 0;1000}1001 1002void ath10k_htc_change_tx_credit_flow(struct ath10k_htc *htc,1003 enum ath10k_htc_ep_id eid,1004 bool enable)1005{1006 struct ath10k *ar = htc->ar;1007 struct ath10k_htc_ep *ep = &ar->htc.endpoint[eid];1008 1009 ep->tx_credit_flow_enabled = enable;1010}1011 1012int ath10k_htc_connect_service(struct ath10k_htc *htc,1013 struct ath10k_htc_svc_conn_req *conn_req,1014 struct ath10k_htc_svc_conn_resp *conn_resp)1015{1016 struct ath10k *ar = htc->ar;1017 struct ath10k_htc_msg *msg;1018 struct ath10k_htc_conn_svc *req_msg;1019 struct ath10k_htc_conn_svc_response resp_msg_dummy;1020 struct ath10k_htc_conn_svc_response *resp_msg = &resp_msg_dummy;1021 enum ath10k_htc_ep_id assigned_eid = ATH10K_HTC_EP_COUNT;1022 struct ath10k_htc_ep *ep;1023 struct sk_buff *skb;1024 unsigned int max_msg_size = 0;1025 int length, status;1026 unsigned long time_left;1027 bool disable_credit_flow_ctrl = false;1028 u16 message_id, service_id, flags = 0;1029 u8 tx_alloc = 0;1030 1031 /* special case for HTC pseudo control service */1032 if (conn_req->service_id == ATH10K_HTC_SVC_ID_RSVD_CTRL) {1033 disable_credit_flow_ctrl = true;1034 assigned_eid = ATH10K_HTC_EP_0;1035 max_msg_size = ATH10K_HTC_MAX_CTRL_MSG_LEN;1036 memset(&resp_msg_dummy, 0, sizeof(resp_msg_dummy));1037 goto setup;1038 }1039 1040 tx_alloc = ath10k_htc_get_credit_allocation(htc,1041 conn_req->service_id);1042 if (!tx_alloc)1043 ath10k_dbg(ar, ATH10K_DBG_BOOT,1044 "boot htc service %s does not allocate target credits\n",1045 htc_service_name(conn_req->service_id));1046 1047 skb = ath10k_htc_build_tx_ctrl_skb(htc->ar);1048 if (!skb) {1049 ath10k_err(ar, "Failed to allocate HTC packet\n");1050 return -ENOMEM;1051 }1052 1053 length = sizeof(msg->hdr) + sizeof(msg->connect_service);1054 skb_put(skb, length);1055 memset(skb->data, 0, length);1056 1057 msg = (struct ath10k_htc_msg *)skb->data;1058 msg->hdr.message_id =1059 __cpu_to_le16(ATH10K_HTC_MSG_CONNECT_SERVICE_ID);1060 1061 flags |= SM(tx_alloc, ATH10K_HTC_CONN_FLAGS_RECV_ALLOC);1062 1063 /* Only enable credit flow control for WMI ctrl service */1064 if (conn_req->service_id != ATH10K_HTC_SVC_ID_WMI_CONTROL) {1065 flags |= ATH10K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL;1066 disable_credit_flow_ctrl = true;1067 }1068 1069 req_msg = &msg->connect_service;1070 req_msg->flags = __cpu_to_le16(flags);1071 req_msg->service_id = __cpu_to_le16(conn_req->service_id);1072 1073 reinit_completion(&htc->ctl_resp);1074 1075 status = ath10k_htc_send(htc, ATH10K_HTC_EP_0, skb);1076 if (status) {1077 kfree_skb(skb);1078 return status;1079 }1080 1081 /* wait for response */1082 time_left = wait_for_completion_timeout(&htc->ctl_resp,1083 ATH10K_HTC_CONN_SVC_TIMEOUT_HZ);1084 if (!time_left) {1085 ath10k_err(ar, "Service connect timeout\n");1086 return -ETIMEDOUT;1087 }1088 1089 /* we controlled the buffer creation, it's aligned */1090 msg = (struct ath10k_htc_msg *)htc->control_resp_buffer;1091 resp_msg = &msg->connect_service_response;1092 message_id = __le16_to_cpu(msg->hdr.message_id);1093 service_id = __le16_to_cpu(resp_msg->service_id);1094 1095 if ((message_id != ATH10K_HTC_MSG_CONNECT_SERVICE_RESP_ID) ||1096 (htc->control_resp_len < sizeof(msg->hdr) +1097 sizeof(msg->connect_service_response))) {1098 ath10k_err(ar, "Invalid resp message ID 0x%x", message_id);1099 return -EPROTO;1100 }1101 1102 ath10k_dbg(ar, ATH10K_DBG_HTC,1103 "HTC Service %s connect response: status: 0x%x, assigned ep: 0x%x\n",1104 htc_service_name(service_id),1105 resp_msg->status, resp_msg->eid);1106 1107 conn_resp->connect_resp_code = resp_msg->status;1108 1109 /* check response status */1110 if (resp_msg->status != ATH10K_HTC_CONN_SVC_STATUS_SUCCESS) {1111 ath10k_err(ar, "HTC Service %s connect request failed: 0x%x)\n",1112 htc_service_name(service_id),1113 resp_msg->status);1114 return -EPROTO;1115 }1116 1117 assigned_eid = (enum ath10k_htc_ep_id)resp_msg->eid;1118 max_msg_size = __le16_to_cpu(resp_msg->max_msg_size);1119 1120setup:1121 1122 if (assigned_eid >= ATH10K_HTC_EP_COUNT)1123 return -EPROTO;1124 1125 if (max_msg_size == 0)1126 return -EPROTO;1127 1128 ep = &htc->endpoint[assigned_eid];1129 ep->eid = assigned_eid;1130 1131 if (ep->service_id != ATH10K_HTC_SVC_ID_UNUSED)1132 return -EPROTO;1133 1134 /* return assigned endpoint to caller */1135 conn_resp->eid = assigned_eid;1136 conn_resp->max_msg_len = __le16_to_cpu(resp_msg->max_msg_size);1137 1138 /* setup the endpoint */1139 ep->service_id = conn_req->service_id;1140 ep->max_tx_queue_depth = conn_req->max_send_queue_depth;1141 ep->max_ep_message_len = __le16_to_cpu(resp_msg->max_msg_size);1142 ep->tx_credits = tx_alloc;1143 ep->tx_credit_size = htc->target_credit_size;1144 1145 if (conn_req->service_id == ATH10K_HTC_SVC_ID_HTT_DATA_MSG &&1146 htc->alt_data_credit_size != 0)1147 ep->tx_credit_size = htc->alt_data_credit_size;1148 1149 /* copy all the callbacks */1150 ep->ep_ops = conn_req->ep_ops;1151 1152 status = ath10k_hif_map_service_to_pipe(htc->ar,1153 ep->service_id,1154 &ep->ul_pipe_id,1155 &ep->dl_pipe_id);1156 if (status) {1157 ath10k_dbg(ar, ATH10K_DBG_BOOT, "unsupported HTC service id: %d\n",1158 ep->service_id);1159 return status;1160 }1161 1162 ath10k_dbg(ar, ATH10K_DBG_BOOT,1163 "boot htc service '%s' ul pipe %d dl pipe %d eid %d ready\n",1164 htc_service_name(ep->service_id), ep->ul_pipe_id,1165 ep->dl_pipe_id, ep->eid);1166 1167 if (disable_credit_flow_ctrl && ep->tx_credit_flow_enabled) {1168 ep->tx_credit_flow_enabled = false;1169 ath10k_dbg(ar, ATH10K_DBG_BOOT,1170 "boot htc service '%s' eid %d TX flow control disabled\n",1171 htc_service_name(ep->service_id), assigned_eid);1172 }1173 1174 return status;1175}1176 1177struct sk_buff *ath10k_htc_alloc_skb(struct ath10k *ar, int size)1178{1179 struct sk_buff *skb;1180 1181 skb = dev_alloc_skb(size + sizeof(struct ath10k_htc_hdr));1182 if (!skb)1183 return NULL;1184 1185 skb_reserve(skb, sizeof(struct ath10k_htc_hdr));1186 1187 /* FW/HTC requires 4-byte aligned streams */1188 if (!IS_ALIGNED((unsigned long)skb->data, 4))1189 ath10k_warn(ar, "Unaligned HTC tx skb\n");1190 1191 return skb;1192}1193 1194static void ath10k_htc_pktlog_process_rx(struct ath10k *ar, struct sk_buff *skb)1195{1196 trace_ath10k_htt_pktlog(ar, skb->data, skb->len);1197 dev_kfree_skb_any(skb);1198}1199 1200static int ath10k_htc_pktlog_connect(struct ath10k *ar)1201{1202 struct ath10k_htc_svc_conn_resp conn_resp;1203 struct ath10k_htc_svc_conn_req conn_req;1204 int status;1205 1206 memset(&conn_req, 0, sizeof(conn_req));1207 memset(&conn_resp, 0, sizeof(conn_resp));1208 1209 conn_req.ep_ops.ep_tx_complete = NULL;1210 conn_req.ep_ops.ep_rx_complete = ath10k_htc_pktlog_process_rx;1211 conn_req.ep_ops.ep_tx_credits = NULL;1212 1213 /* connect to control service */1214 conn_req.service_id = ATH10K_HTC_SVC_ID_HTT_LOG_MSG;1215 status = ath10k_htc_connect_service(&ar->htc, &conn_req, &conn_resp);1216 if (status) {1217 ath10k_warn(ar, "failed to connect to PKTLOG service: %d\n",1218 status);1219 return status;1220 }1221 1222 return 0;1223}1224 1225static bool ath10k_htc_pktlog_svc_supported(struct ath10k *ar)1226{1227 u8 ul_pipe_id;1228 u8 dl_pipe_id;1229 int status;1230 1231 status = ath10k_hif_map_service_to_pipe(ar, ATH10K_HTC_SVC_ID_HTT_LOG_MSG,1232 &ul_pipe_id,1233 &dl_pipe_id);1234 if (status) {1235 ath10k_dbg(ar, ATH10K_DBG_BOOT, "unsupported HTC pktlog service id: %d\n",1236 ATH10K_HTC_SVC_ID_HTT_LOG_MSG);1237 1238 return false;1239 }1240 1241 return true;1242}1243 1244int ath10k_htc_start(struct ath10k_htc *htc)1245{1246 struct ath10k *ar = htc->ar;1247 struct sk_buff *skb;1248 int status = 0;1249 struct ath10k_htc_msg *msg;1250 1251 skb = ath10k_htc_build_tx_ctrl_skb(htc->ar);1252 if (!skb)1253 return -ENOMEM;1254 1255 skb_put(skb, sizeof(msg->hdr) + sizeof(msg->setup_complete_ext));1256 memset(skb->data, 0, skb->len);1257 1258 msg = (struct ath10k_htc_msg *)skb->data;1259 msg->hdr.message_id =1260 __cpu_to_le16(ATH10K_HTC_MSG_SETUP_COMPLETE_EX_ID);1261 1262 if (ar->hif.bus == ATH10K_BUS_SDIO) {1263 /* Extra setup params used by SDIO */1264 msg->setup_complete_ext.flags =1265 __cpu_to_le32(ATH10K_HTC_SETUP_COMPLETE_FLAGS_RX_BNDL_EN);1266 msg->setup_complete_ext.max_msgs_per_bundled_recv =1267 htc->max_msgs_per_htc_bundle;1268 }1269 ath10k_dbg(ar, ATH10K_DBG_HTC, "HTC is using TX credit flow control\n");1270 1271 status = ath10k_htc_send(htc, ATH10K_HTC_EP_0, skb);1272 if (status) {1273 kfree_skb(skb);1274 return status;1275 }1276 1277 if (ath10k_htc_pktlog_svc_supported(ar)) {1278 status = ath10k_htc_pktlog_connect(ar);1279 if (status) {1280 ath10k_err(ar, "failed to connect to pktlog: %d\n", status);1281 return status;1282 }1283 }1284 1285 return 0;1286}1287 1288/* registered target arrival callback from the HIF layer */1289int ath10k_htc_init(struct ath10k *ar)1290{1291 int status;1292 struct ath10k_htc *htc = &ar->htc;1293 struct ath10k_htc_svc_conn_req conn_req;1294 struct ath10k_htc_svc_conn_resp conn_resp;1295 1296 spin_lock_init(&htc->tx_lock);1297 1298 ath10k_htc_reset_endpoint_states(htc);1299 1300 htc->ar = ar;1301 1302 /* setup our pseudo HTC control endpoint connection */1303 memset(&conn_req, 0, sizeof(conn_req));1304 memset(&conn_resp, 0, sizeof(conn_resp));1305 conn_req.ep_ops.ep_tx_complete = ath10k_htc_control_tx_complete;1306 conn_req.ep_ops.ep_rx_complete = ath10k_htc_control_rx_complete;1307 conn_req.max_send_queue_depth = ATH10K_NUM_CONTROL_TX_BUFFERS;1308 conn_req.service_id = ATH10K_HTC_SVC_ID_RSVD_CTRL;1309 1310 /* connect fake service */1311 status = ath10k_htc_connect_service(htc, &conn_req, &conn_resp);1312 if (status) {1313 ath10k_err(ar, "could not connect to htc service (%d)\n",1314 status);1315 return status;1316 }1317 1318 init_completion(&htc->ctl_resp);1319 1320 return 0;1321}1322