htc.c

   1// SPDX-License-Identifier: ISC
   2/*
   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 * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
   7 */
   8
   9#include <linux/export.h>
  10
  11#include "core.h"
  12#include "hif.h"
  13#include "debug.h"
  14
  15/********/
  16/* Send */
  17/********/
  18
  19static void ath10k_htc_control_tx_complete(struct ath10k *ar,
  20					   struct sk_buff *skb)
  21{
  22	kfree_skb(skb);
  23}
  24
  25static struct sk_buff *ath10k_htc_build_tx_ctrl_skb(void *ar)
  26{
  27	struct sk_buff *skb;
  28	struct ath10k_skb_cb *skb_cb;
  29
  30	skb = dev_alloc_skb(ATH10K_HTC_CONTROL_BUFFER_SIZE);
  31	if (!skb)
  32		return NULL;
  33
  34	skb_reserve(skb, 20); /* FIXME: why 20 bytes? */
  35	WARN_ONCE((unsigned long)skb->data & 3, "unaligned skb");
  36
  37	skb_cb = ATH10K_SKB_CB(skb);
  38	memset(skb_cb, 0, sizeof(*skb_cb));
  39
  40	ath10k_dbg(ar, ATH10K_DBG_HTC, "%s: skb %p\n", __func__, skb);
  41	return skb;
  42}
  43
  44static inline void ath10k_htc_restore_tx_skb(struct ath10k_htc *htc,
  45					     struct sk_buff *skb)
  46{
  47	struct ath10k_skb_cb *skb_cb = ATH10K_SKB_CB(skb);
  48
  49	if (htc->ar->bus_param.dev_type != ATH10K_DEV_TYPE_HL)
  50		dma_unmap_single(htc->ar->dev, skb_cb->paddr, skb->len, DMA_TO_DEVICE);
  51	skb_pull(skb, sizeof(struct ath10k_htc_hdr));
  52}
  53
  54void ath10k_htc_notify_tx_completion(struct ath10k_htc_ep *ep,
  55				     struct sk_buff *skb)
  56{
  57	struct ath10k *ar = ep->htc->ar;
  58	struct ath10k_htc_hdr *hdr;
  59
  60	ath10k_dbg(ar, ATH10K_DBG_HTC, "%s: ep %d skb %p\n", __func__,
  61		   ep->eid, skb);
  62
  63	/* A corner case where the copy completion is reaching to host but still
  64	 * copy engine is processing it due to which host unmaps corresponding
  65	 * memory and causes SMMU fault, hence as workaround adding delay
  66	 * the unmapping memory to avoid SMMU faults.
  67	 */
  68	if (ar->hw_params.delay_unmap_buffer &&
  69	    ep->ul_pipe_id == 3)
  70		mdelay(2);
  71
  72	hdr = (struct ath10k_htc_hdr *)skb->data;
  73	ath10k_htc_restore_tx_skb(ep->htc, skb);
  74
  75	if (!ep->ep_ops.ep_tx_complete) {
  76		ath10k_warn(ar, "no tx handler for eid %d\n", ep->eid);
  77		dev_kfree_skb_any(skb);
  78		return;
  79	}
  80
  81	if (hdr->flags & ATH10K_HTC_FLAG_SEND_BUNDLE) {
  82		dev_kfree_skb_any(skb);
  83		return;
  84	}
  85
  86	ep->ep_ops.ep_tx_complete(ep->htc->ar, skb);
  87}
  88EXPORT_SYMBOL(ath10k_htc_notify_tx_completion);
  89
  90static void ath10k_htc_prepare_tx_skb(struct ath10k_htc_ep *ep,
  91				      struct sk_buff *skb)
  92{
  93	struct ath10k_htc_hdr *hdr;
  94
  95	hdr = (struct ath10k_htc_hdr *)skb->data;
  96	memset(hdr, 0, sizeof(struct ath10k_htc_hdr));
  97
  98	hdr->eid = ep->eid;
  99	hdr->len = __cpu_to_le16(skb->len - sizeof(*hdr));
 100	hdr->flags = 0;
 101	if (ep->tx_credit_flow_enabled && !ep->bundle_tx)
 102		hdr->flags |= ATH10K_HTC_FLAG_NEED_CREDIT_UPDATE;
 103
 104	spin_lock_bh(&ep->htc->tx_lock);
 105	hdr->seq_no = ep->seq_no++;
 106	spin_unlock_bh(&ep->htc->tx_lock);
 107}
 108
 109static int ath10k_htc_consume_credit(struct ath10k_htc_ep *ep,
 110				     unsigned int len,
 111				     bool consume)
 112{
 113	struct ath10k_htc *htc = ep->htc;
 114	struct ath10k *ar = htc->ar;
 115	enum ath10k_htc_ep_id eid = ep->eid;
 116	int credits, ret = 0;
 117
 118	if (!ep->tx_credit_flow_enabled)
 119		return 0;
 120
 121	credits = DIV_ROUND_UP(len, ep->tx_credit_size);
 122	spin_lock_bh(&htc->tx_lock);
 123
 124	if (ep->tx_credits < credits) {
 125		ath10k_dbg(ar, ATH10K_DBG_HTC,
 126			   "htc insufficient credits ep %d required %d available %d consume %d\n",
 127			   eid, credits, ep->tx_credits, consume);
 128		ret = -EAGAIN;
 129		goto unlock;
 130	}
 131
 132	if (consume) {
 133		ep->tx_credits -= credits;
 134		ath10k_dbg(ar, ATH10K_DBG_HTC,
 135			   "htc ep %d consumed %d credits total %d\n",
 136			   eid, credits, ep->tx_credits);
 137	}
 138
 139unlock:
 140	spin_unlock_bh(&htc->tx_lock);
 141	return ret;
 142}
 143
 144static void ath10k_htc_release_credit(struct ath10k_htc_ep *ep, unsigned int len)
 145{
 146	struct ath10k_htc *htc = ep->htc;
 147	struct ath10k *ar = htc->ar;
 148	enum ath10k_htc_ep_id eid = ep->eid;
 149	int credits;
 150
 151	if (!ep->tx_credit_flow_enabled)
 152		return;
 153
 154	credits = DIV_ROUND_UP(len, ep->tx_credit_size);
 155	spin_lock_bh(&htc->tx_lock);
 156	ep->tx_credits += credits;
 157	ath10k_dbg(ar, ATH10K_DBG_HTC,
 158		   "htc ep %d reverted %d credits back total %d\n",
 159		   eid, credits, ep->tx_credits);
 160	spin_unlock_bh(&htc->tx_lock);
 161
 162	if (ep->ep_ops.ep_tx_credits)
 163		ep->ep_ops.ep_tx_credits(htc->ar);
 164}
 165
 166int ath10k_htc_send(struct ath10k_htc *htc,
 167		    enum ath10k_htc_ep_id eid,
 168		    struct sk_buff *skb)
 169{
 170	struct ath10k *ar = htc->ar;
 171	struct ath10k_htc_ep *ep = &htc->endpoint[eid];
 172	struct ath10k_skb_cb *skb_cb = ATH10K_SKB_CB(skb);
 173	struct ath10k_hif_sg_item sg_item;
 174	struct device *dev = htc->ar->dev;
 175	int ret;
 176	unsigned int skb_len;
 177
 178	if (htc->ar->state == ATH10K_STATE_WEDGED)
 179		return -ECOMM;
 180
 181	if (eid >= ATH10K_HTC_EP_COUNT) {
 182		ath10k_warn(ar, "Invalid endpoint id: %d\n", eid);
 183		return -ENOENT;
 184	}
 185
 186	skb_push(skb, sizeof(struct ath10k_htc_hdr));
 187
 188	skb_len = skb->len;
 189	ret = ath10k_htc_consume_credit(ep, skb_len, true);
 190	if (ret)
 191		goto err_pull;
 192
 193	ath10k_htc_prepare_tx_skb(ep, skb);
 194
 195	skb_cb->eid = eid;
 196	if (ar->bus_param.dev_type != ATH10K_DEV_TYPE_HL) {
 197		skb_cb->paddr = dma_map_single(dev, skb->data, skb->len,
 198					       DMA_TO_DEVICE);
 199		ret = dma_mapping_error(dev, skb_cb->paddr);
 200		if (ret) {
 201			ret = -EIO;
 202			goto err_credits;
 203		}
 204	}
 205
 206	sg_item.transfer_id = ep->eid;
 207	sg_item.transfer_context = skb;
 208	sg_item.vaddr = skb->data;
 209	sg_item.paddr = skb_cb->paddr;
 210	sg_item.len = skb->len;
 211
 212	ret = ath10k_hif_tx_sg(htc->ar, ep->ul_pipe_id, &sg_item, 1);
 213	if (ret)
 214		goto err_unmap;
 215
 216	return 0;
 217
 218err_unmap:
 219	if (ar->bus_param.dev_type != ATH10K_DEV_TYPE_HL)
 220		dma_unmap_single(dev, skb_cb->paddr, skb->len, DMA_TO_DEVICE);
 221err_credits:
 222	ath10k_htc_release_credit(ep, skb_len);
 223err_pull:
 224	skb_pull(skb, sizeof(struct ath10k_htc_hdr));
 225	return ret;
 226}
 227
 228void ath10k_htc_tx_completion_handler(struct ath10k *ar, struct sk_buff *skb)
 229{
 230	struct ath10k_htc *htc = &ar->htc;
 231	struct ath10k_skb_cb *skb_cb;
 232	struct ath10k_htc_ep *ep;
 233
 234	if (WARN_ON_ONCE(!skb))
 235		return;
 236
 237	skb_cb = ATH10K_SKB_CB(skb);
 238	ep = &htc->endpoint[skb_cb->eid];
 239
 240	ath10k_htc_notify_tx_completion(ep, skb);
 241	/* the skb now belongs to the completion handler */
 242}
 243EXPORT_SYMBOL(ath10k_htc_tx_completion_handler);
 244
 245/***********/
 246/* Receive */
 247/***********/
 248
 249static void
 250ath10k_htc_process_credit_report(struct ath10k_htc *htc,
 251				 const struct ath10k_htc_credit_report *report,
 252				 int len,
 253				 enum ath10k_htc_ep_id eid)
 254{
 255	struct ath10k *ar = htc->ar;
 256	struct ath10k_htc_ep *ep;
 257	int i, n_reports;
 258
 259	if (len % sizeof(*report))
 260		ath10k_warn(ar, "Uneven credit report len %d", len);
 261
 262	n_reports = len / sizeof(*report);
 263
 264	spin_lock_bh(&htc->tx_lock);
 265	for (i = 0; i < n_reports; i++, report++) {
 266		if (report->eid >= ATH10K_HTC_EP_COUNT)
 267			break;
 268
 269		ep = &htc->endpoint[report->eid];
 270		ep->tx_credits += report->credits;
 271
 272		ath10k_dbg(ar, ATH10K_DBG_HTC, "htc ep %d got %d credits (total %d)\n",
 273			   report->eid, report->credits, ep->tx_credits);
 274
 275		if (ep->ep_ops.ep_tx_credits) {
 276			spin_unlock_bh(&htc->tx_lock);
 277			ep->ep_ops.ep_tx_credits(htc->ar);
 278			spin_lock_bh(&htc->tx_lock);
 279		}
 280	}
 281	spin_unlock_bh(&htc->tx_lock);
 282}
 283
 284static int
 285ath10k_htc_process_lookahead(struct ath10k_htc *htc,
 286			     const struct ath10k_htc_lookahead_report *report,
 287			     int len,
 288			     enum ath10k_htc_ep_id eid,
 289			     void *next_lookaheads,
 290			     int *next_lookaheads_len)
 291{
 292	struct ath10k *ar = htc->ar;
 293
 294	/* Invalid lookahead flags are actually transmitted by
 295	 * the target in the HTC control message.
 296	 * Since this will happen at every boot we silently ignore
 297	 * the lookahead in this case
 298	 */
 299	if (report->pre_valid != ((~report->post_valid) & 0xFF))
 300		return 0;
 301
 302	if (next_lookaheads && next_lookaheads_len) {
 303		ath10k_dbg(ar, ATH10K_DBG_HTC,
 304			   "htc rx lookahead found pre_valid 0x%x post_valid 0x%x\n",
 305			   report->pre_valid, report->post_valid);
 306
 307		/* look ahead bytes are valid, copy them over */
 308		memcpy((u8 *)next_lookaheads, report->lookahead, 4);
 309
 310		*next_lookaheads_len = 1;
 311	}
 312
 313	return 0;
 314}
 315
 316static int
 317ath10k_htc_process_lookahead_bundle(struct ath10k_htc *htc,
 318				    const struct ath10k_htc_lookahead_bundle *report,
 319				    int len,
 320				    enum ath10k_htc_ep_id eid,
 321				    void *next_lookaheads,
 322				    int *next_lookaheads_len)
 323{
 324	struct ath10k *ar = htc->ar;
 325	int bundle_cnt = len / sizeof(*report);
 326
 327	if (!bundle_cnt || (bundle_cnt > htc->max_msgs_per_htc_bundle)) {
 328		ath10k_warn(ar, "Invalid lookahead bundle count: %d\n",
 329			    bundle_cnt);
 330		return -EINVAL;
 331	}
 332
 333	if (next_lookaheads && next_lookaheads_len) {
 334		int i;
 335
 336		for (i = 0; i < bundle_cnt; i++) {
 337			memcpy(((u8 *)next_lookaheads) + 4 * i,
 338			       report->lookahead, 4);
 339			report++;
 340		}
 341
 342		*next_lookaheads_len = bundle_cnt;
 343	}
 344
 345	return 0;
 346}
 347
 348int ath10k_htc_process_trailer(struct ath10k_htc *htc,
 349			       u8 *buffer,
 350			       int length,
 351			       enum ath10k_htc_ep_id src_eid,
 352			       void *next_lookaheads,
 353			       int *next_lookaheads_len)
 354{
 355	struct ath10k_htc_lookahead_bundle *bundle;
 356	struct ath10k *ar = htc->ar;
 357	int status = 0;
 358	struct ath10k_htc_record *record;
 359	u8 *orig_buffer;
 360	int orig_length;
 361	size_t len;
 362
 363	orig_buffer = buffer;
 364	orig_length = length;
 365
 366	while (length > 0) {
 367		record = (struct ath10k_htc_record *)buffer;
 368
 369		if (length < sizeof(record->hdr)) {
 370			status = -EINVAL;
 371			break;
 372		}
 373
 374		if (record->hdr.len > length) {
 375			/* no room left in buffer for record */
 376			ath10k_warn(ar, "Invalid record length: %d\n",
 377				    record->hdr.len);
 378			status = -EINVAL;
 379			break;
 380		}
 381
 382		switch (record->hdr.id) {
 383		case ATH10K_HTC_RECORD_CREDITS:
 384			len = sizeof(struct ath10k_htc_credit_report);
 385			if (record->hdr.len < len) {
 386				ath10k_warn(ar, "Credit report too long\n");
 387				status = -EINVAL;
 388				break;
 389			}
 390			ath10k_htc_process_credit_report(htc,
 391							 record->credit_report,
 392							 record->hdr.len,
 393							 src_eid);
 394			break;
 395		case ATH10K_HTC_RECORD_LOOKAHEAD:
 396			len = sizeof(struct ath10k_htc_lookahead_report);
 397			if (record->hdr.len < len) {
 398				ath10k_warn(ar, "Lookahead report too long\n");
 399				status = -EINVAL;
 400				break;
 401			}
 402			status = ath10k_htc_process_lookahead(htc,
 403							      record->lookahead_report,
 404							      record->hdr.len,
 405							      src_eid,
 406							      next_lookaheads,
 407							      next_lookaheads_len);
 408			break;
 409		case ATH10K_HTC_RECORD_LOOKAHEAD_BUNDLE:
 410			bundle = record->lookahead_bundle;
 411			status = ath10k_htc_process_lookahead_bundle(htc,
 412								     bundle,
 413								     record->hdr.len,
 414								     src_eid,
 415								     next_lookaheads,
 416								     next_lookaheads_len);
 417			break;
 418		default:
 419			ath10k_warn(ar, "Unhandled record: id:%d length:%d\n",
 420				    record->hdr.id, record->hdr.len);
 421			break;
 422		}
 423
 424		if (status)
 425			break;
 426
 427		/* multiple records may be present in a trailer */
 428		buffer += sizeof(record->hdr) + record->hdr.len;
 429		length -= sizeof(record->hdr) + record->hdr.len;
 430	}
 431
 432	if (status)
 433		ath10k_dbg_dump(ar, ATH10K_DBG_HTC, "htc rx bad trailer", "",
 434				orig_buffer, orig_length);
 435
 436	return status;
 437}
 438EXPORT_SYMBOL(ath10k_htc_process_trailer);
 439
 440void ath10k_htc_rx_completion_handler(struct ath10k *ar, struct sk_buff *skb)
 441{
 442	int status = 0;
 443	struct ath10k_htc *htc = &ar->htc;
 444	struct ath10k_htc_hdr *hdr;
 445	struct ath10k_htc_ep *ep;
 446	u16 payload_len;
 447	u32 trailer_len = 0;
 448	size_t min_len;
 449	u8 eid;
 450	bool trailer_present;
 451
 452	hdr = (struct ath10k_htc_hdr *)skb->data;
 453	skb_pull(skb, sizeof(*hdr));
 454
 455	eid = hdr->eid;
 456
 457	if (eid >= ATH10K_HTC_EP_COUNT) {
 458		ath10k_warn(ar, "HTC Rx: invalid eid %d\n", eid);
 459		ath10k_dbg_dump(ar, ATH10K_DBG_HTC, "htc bad header", "",
 460				hdr, sizeof(*hdr));
 461		goto out;
 462	}
 463
 464	ep = &htc->endpoint[eid];
 465	if (ep->service_id == ATH10K_HTC_SVC_ID_UNUSED) {
 466		ath10k_warn(ar, "htc rx endpoint %d is not connected\n", eid);
 467		goto out;
 468	}
 469
 470	payload_len = __le16_to_cpu(hdr->len);
 471
 472	if (payload_len + sizeof(*hdr) > ATH10K_HTC_MAX_LEN) {
 473		ath10k_warn(ar, "HTC rx frame too long, len: %zu\n",
 474			    payload_len + sizeof(*hdr));
 475		ath10k_dbg_dump(ar, ATH10K_DBG_HTC, "htc bad rx pkt len", "",
 476				hdr, sizeof(*hdr));
 477		goto out;
 478	}
 479
 480	if (skb->len < payload_len) {
 481		ath10k_dbg(ar, ATH10K_DBG_HTC,
 482			   "HTC Rx: insufficient length, got %d, expected %d\n",
 483			   skb->len, payload_len);
 484		ath10k_dbg_dump(ar, ATH10K_DBG_HTC, "htc bad rx pkt len",
 485				"", hdr, sizeof(*hdr));
 486		goto out;
 487	}
 488
 489	/* get flags to check for trailer */
 490	trailer_present = hdr->flags & ATH10K_HTC_FLAG_TRAILER_PRESENT;
 491	if (trailer_present) {
 492		u8 *trailer;
 493
 494		trailer_len = hdr->trailer_len;
 495		min_len = sizeof(struct ath10k_ath10k_htc_record_hdr);
 496
 497		if ((trailer_len < min_len) ||
 498		    (trailer_len > payload_len)) {
 499			ath10k_warn(ar, "Invalid trailer length: %d\n",
 500				    trailer_len);
 501			goto out;
 502		}
 503
 504		trailer = (u8 *)hdr;
 505		trailer += sizeof(*hdr);
 506		trailer += payload_len;
 507		trailer -= trailer_len;
 508		status = ath10k_htc_process_trailer(htc, trailer,
 509						    trailer_len, hdr->eid,
 510						    NULL, NULL);
 511		if (status)
 512			goto out;
 513
 514		skb_trim(skb, skb->len - trailer_len);
 515	}
 516
 517	if (((int)payload_len - (int)trailer_len) <= 0)
 518		/* zero length packet with trailer data, just drop these */
 519		goto out;
 520
 521	ath10k_dbg(ar, ATH10K_DBG_HTC, "htc rx completion ep %d skb %p\n",
 522		   eid, skb);
 523	ep->ep_ops.ep_rx_complete(ar, skb);
 524
 525	/* skb is now owned by the rx completion handler */
 526	skb = NULL;
 527out:
 528	kfree_skb(skb);
 529}
 530EXPORT_SYMBOL(ath10k_htc_rx_completion_handler);
 531
 532static void ath10k_htc_control_rx_complete(struct ath10k *ar,
 533					   struct sk_buff *skb)
 534{
 535	struct ath10k_htc *htc = &ar->htc;
 536	struct ath10k_htc_msg *msg = (struct ath10k_htc_msg *)skb->data;
 537
 538	switch (__le16_to_cpu(msg->hdr.message_id)) {
 539	case ATH10K_HTC_MSG_READY_ID:
 540	case ATH10K_HTC_MSG_CONNECT_SERVICE_RESP_ID:
 541		/* handle HTC control message */
 542		if (completion_done(&htc->ctl_resp)) {
 543			/* this is a fatal error, target should not be
 544			 * sending unsolicited messages on the ep 0
 545			 */
 546			ath10k_warn(ar, "HTC rx ctrl still processing\n");
 547			complete(&htc->ctl_resp);
 548			goto out;
 549		}
 550
 551		htc->control_resp_len =
 552			min_t(int, skb->len,
 553			      ATH10K_HTC_MAX_CTRL_MSG_LEN);
 554
 555		memcpy(htc->control_resp_buffer, skb->data,
 556		       htc->control_resp_len);
 557
 558		complete(&htc->ctl_resp);
 559		break;
 560	case ATH10K_HTC_MSG_SEND_SUSPEND_COMPLETE:
 561		htc->htc_ops.target_send_suspend_complete(ar);
 562		break;
 563	default:
 564		ath10k_warn(ar, "ignoring unsolicited htc ep0 event\n");
 565		break;
 566	}
 567
 568out:
 569	kfree_skb(skb);
 570}
 571
 572/***************/
 573/* Init/Deinit */
 574/***************/
 575
 576static const char *htc_service_name(enum ath10k_htc_svc_id id)
 577{
 578	switch (id) {
 579	case ATH10K_HTC_SVC_ID_RESERVED:
 580		return "Reserved";
 581	case ATH10K_HTC_SVC_ID_RSVD_CTRL:
 582		return "Control";
 583	case ATH10K_HTC_SVC_ID_WMI_CONTROL:
 584		return "WMI";
 585	case ATH10K_HTC_SVC_ID_WMI_DATA_BE:
 586		return "DATA BE";
 587	case ATH10K_HTC_SVC_ID_WMI_DATA_BK:
 588		return "DATA BK";
 589	case ATH10K_HTC_SVC_ID_WMI_DATA_VI:
 590		return "DATA VI";
 591	case ATH10K_HTC_SVC_ID_WMI_DATA_VO:
 592		return "DATA VO";
 593	case ATH10K_HTC_SVC_ID_NMI_CONTROL:
 594		return "NMI Control";
 595	case ATH10K_HTC_SVC_ID_NMI_DATA:
 596		return "NMI Data";
 597	case ATH10K_HTC_SVC_ID_HTT_DATA_MSG:
 598		return "HTT Data";
 599	case ATH10K_HTC_SVC_ID_HTT_DATA2_MSG:
 600		return "HTT Data";
 601	case ATH10K_HTC_SVC_ID_HTT_DATA3_MSG:
 602		return "HTT Data";
 603	case ATH10K_HTC_SVC_ID_TEST_RAW_STREAMS:
 604		return "RAW";
 605	case ATH10K_HTC_SVC_ID_HTT_LOG_MSG:
 606		return "PKTLOG";
 607	}
 608
 609	return "Unknown";
 610}
 611
 612static void ath10k_htc_reset_endpoint_states(struct ath10k_htc *htc)
 613{
 614	struct ath10k_htc_ep *ep;
 615	int i;
 616
 617	for (i = ATH10K_HTC_EP_0; i < ATH10K_HTC_EP_COUNT; i++) {
 618		ep = &htc->endpoint[i];
 619		ep->service_id = ATH10K_HTC_SVC_ID_UNUSED;
 620		ep->max_ep_message_len = 0;
 621		ep->max_tx_queue_depth = 0;
 622		ep->eid = i;
 623		ep->htc = htc;
 624		ep->tx_credit_flow_enabled = true;
 625	}
 626}
 627
 628static u8 ath10k_htc_get_credit_allocation(struct ath10k_htc *htc,
 629					   u16 service_id)
 630{
 631	u8 allocation = 0;
 632
 633	/* The WMI control service is the only service with flow control.
 634	 * Let it have all transmit credits.
 635	 */
 636	if (service_id == ATH10K_HTC_SVC_ID_WMI_CONTROL)
 637		allocation = htc->total_transmit_credits;
 638
 639	return allocation;
 640}
 641
 642static int ath10k_htc_send_bundle(struct ath10k_htc_ep *ep,
 643				  struct sk_buff *bundle_skb,
 644				  struct sk_buff_head *tx_save_head)
 645{
 646	struct ath10k_hif_sg_item sg_item;
 647	struct ath10k_htc *htc = ep->htc;
 648	struct ath10k *ar = htc->ar;
 649	struct sk_buff *skb;
 650	int ret, cn = 0;
 651	unsigned int skb_len;
 652
 653	ath10k_dbg(ar, ATH10K_DBG_HTC, "bundle skb len %d\n", bundle_skb->len);
 654	skb_len = bundle_skb->len;
 655	ret = ath10k_htc_consume_credit(ep, skb_len, true);
 656
 657	if (!ret) {
 658		sg_item.transfer_id = ep->eid;
 659		sg_item.transfer_context = bundle_skb;
 660		sg_item.vaddr = bundle_skb->data;
 661		sg_item.len = bundle_skb->len;
 662
 663		ret = ath10k_hif_tx_sg(htc->ar, ep->ul_pipe_id, &sg_item, 1);
 664		if (ret)
 665			ath10k_htc_release_credit(ep, skb_len);
 666	}
 667
 668	if (ret)
 669		dev_kfree_skb_any(bundle_skb);
 670
 671	for (cn = 0; (skb = skb_dequeue_tail(tx_save_head)); cn++) {
 672		if (ret) {
 673			skb_pull(skb, sizeof(struct ath10k_htc_hdr));
 674			skb_queue_head(&ep->tx_req_head, skb);
 675		} else {
 676			skb_queue_tail(&ep->tx_complete_head, skb);
 677		}
 678	}
 679
 680	if (!ret)
 681		queue_work(ar->workqueue_tx_complete, &ar->tx_complete_work);
 682
 683	ath10k_dbg(ar, ATH10K_DBG_HTC,
 684		   "bundle tx status %d eid %d req count %d count %d len %d\n",
 685		   ret, ep->eid, skb_queue_len(&ep->tx_req_head), cn, skb_len);
 686	return ret;
 687}
 688
 689static void ath10k_htc_send_one_skb(struct ath10k_htc_ep *ep, struct sk_buff *skb)
 690{
 691	struct ath10k_htc *htc = ep->htc;
 692	struct ath10k *ar = htc->ar;
 693	int ret;
 694
 695	ret = ath10k_htc_send(htc, ep->eid, skb);
 696
 697	if (ret)
 698		skb_queue_head(&ep->tx_req_head, skb);
 699
 700	ath10k_dbg(ar, ATH10K_DBG_HTC, "tx one status %d eid %d len %d pending count %d\n",
 701		   ret, ep->eid, skb->len, skb_queue_len(&ep->tx_req_head));
 702}
 703
 704static int ath10k_htc_send_bundle_skbs(struct ath10k_htc_ep *ep)
 705{
 706	struct ath10k_htc *htc = ep->htc;
 707	struct sk_buff *bundle_skb, *skb;
 708	struct sk_buff_head tx_save_head;
 709	struct ath10k_htc_hdr *hdr;
 710	u8 *bundle_buf;
 711	int ret = 0, credit_pad, credit_remainder, trans_len, bundles_left = 0;
 712
 713	if (htc->ar->state == ATH10K_STATE_WEDGED)
 714		return -ECOMM;
 715
 716	if (ep->tx_credit_flow_enabled &&
 717	    ep->tx_credits < ATH10K_MIN_CREDIT_PER_HTC_TX_BUNDLE)
 718		return 0;
 719
 720	bundles_left = ATH10K_MAX_MSG_PER_HTC_TX_BUNDLE * ep->tx_credit_size;
 721	bundle_skb = dev_alloc_skb(bundles_left);
 722
 723	if (!bundle_skb)
 724		return -ENOMEM;
 725
 726	bundle_buf = bundle_skb->data;
 727	skb_queue_head_init(&tx_save_head);
 728
 729	while (true) {
 730		skb = skb_dequeue(&ep->tx_req_head);
 731		if (!skb)
 732			break;
 733
 734		credit_pad = 0;
 735		trans_len = skb->len + sizeof(*hdr);
 736		credit_remainder = trans_len % ep->tx_credit_size;
 737
 738		if (credit_remainder != 0) {
 739			credit_pad = ep->tx_credit_size - credit_remainder;
 740			trans_len += credit_pad;
 741		}
 742
 743		ret = ath10k_htc_consume_credit(ep,
 744						bundle_buf + trans_len - bundle_skb->data,
 745						false);
 746		if (ret) {
 747			skb_queue_head(&ep->tx_req_head, skb);
 748			break;
 749		}
 750
 751		if (bundles_left < trans_len) {
 752			bundle_skb->len = bundle_buf - bundle_skb->data;
 753			ret = ath10k_htc_send_bundle(ep, bundle_skb, &tx_save_head);
 754
 755			if (ret) {
 756				skb_queue_head(&ep->tx_req_head, skb);
 757				return ret;
 758			}
 759
 760			if (skb_queue_len(&ep->tx_req_head) == 0) {
 761				ath10k_htc_send_one_skb(ep, skb);
 762				return ret;
 763			}
 764
 765			if (ep->tx_credit_flow_enabled &&
 766			    ep->tx_credits < ATH10K_MIN_CREDIT_PER_HTC_TX_BUNDLE) {
 767				skb_queue_head(&ep->tx_req_head, skb);
 768				return 0;
 769			}
 770
 771			bundles_left =
 772				ATH10K_MAX_MSG_PER_HTC_TX_BUNDLE * ep->tx_credit_size;
 773			bundle_skb = dev_alloc_skb(bundles_left);
 774
 775			if (!bundle_skb) {
 776				skb_queue_head(&ep->tx_req_head, skb);
 777				return -ENOMEM;
 778			}
 779			bundle_buf = bundle_skb->data;
 780			skb_queue_head_init(&tx_save_head);
 781		}
 782
 783		skb_push(skb, sizeof(struct ath10k_htc_hdr));
 784		ath10k_htc_prepare_tx_skb(ep, skb);
 785
 786		memcpy(bundle_buf, skb->data, skb->len);
 787		hdr = (struct ath10k_htc_hdr *)bundle_buf;
 788		hdr->flags |= ATH10K_HTC_FLAG_SEND_BUNDLE;
 789		hdr->pad_len = __cpu_to_le16(credit_pad);
 790		bundle_buf += trans_len;
 791		bundles_left -= trans_len;
 792		skb_queue_tail(&tx_save_head, skb);
 793	}
 794
 795	if (bundle_buf != bundle_skb->data) {
 796		bundle_skb->len = bundle_buf - bundle_skb->data;
 797		ret = ath10k_htc_send_bundle(ep, bundle_skb, &tx_save_head);
 798	} else {
 799		dev_kfree_skb_any(bundle_skb);
 800	}
 801
 802	return ret;
 803}
 804
 805static void ath10k_htc_bundle_tx_work(struct work_struct *work)
 806{
 807	struct ath10k *ar = container_of(work, struct ath10k, bundle_tx_work);
 808	struct ath10k_htc_ep *ep;
 809	struct sk_buff *skb;
 810	int i;
 811
 812	for (i = 0; i < ARRAY_SIZE(ar->htc.endpoint); i++) {
 813		ep = &ar->htc.endpoint[i];
 814
 815		if (!ep->bundle_tx)
 816			continue;
 817
 818		ath10k_dbg(ar, ATH10K_DBG_HTC, "bundle tx work eid %d count %d\n",
 819			   ep->eid, skb_queue_len(&ep->tx_req_head));
 820
 821		if (skb_queue_len(&ep->tx_req_head) >=
 822		    ATH10K_MIN_MSG_PER_HTC_TX_BUNDLE) {
 823			ath10k_htc_send_bundle_skbs(ep);
 824		} else {
 825			skb = skb_dequeue(&ep->tx_req_head);
 826
 827			if (!skb)
 828				continue;
 829			ath10k_htc_send_one_skb(ep, skb);
 830		}
 831	}
 832}
 833
 834static void ath10k_htc_tx_complete_work(struct work_struct *work)
 835{
 836	struct ath10k *ar = container_of(work, struct ath10k, tx_complete_work);
 837	struct ath10k_htc_ep *ep;
 838	enum ath10k_htc_ep_id eid;
 839	struct sk_buff *skb;
 840	int i;
 841
 842	for (i = 0; i < ARRAY_SIZE(ar->htc.endpoint); i++) {
 843		ep = &ar->htc.endpoint[i];
 844		eid = ep->eid;
 845		if (ep->bundle_tx && eid == ar->htt.eid) {
 846			ath10k_dbg(ar, ATH10K_DBG_HTC, "bundle tx complete eid %d pending complete count%d\n",
 847				   ep->eid, skb_queue_len(&ep->tx_complete_head));
 848
 849			while (true) {
 850				skb = skb_dequeue(&ep->tx_complete_head);
 851				if (!skb)
 852					break;
 853				ath10k_htc_notify_tx_completion(ep, skb);
 854			}
 855		}
 856	}
 857}
 858
 859int ath10k_htc_send_hl(struct ath10k_htc *htc,
 860		       enum ath10k_htc_ep_id eid,
 861		       struct sk_buff *skb)
 862{
 863	struct ath10k_htc_ep *ep = &htc->endpoint[eid];
 864	struct ath10k *ar = htc->ar;
 865
 866	if (sizeof(struct ath10k_htc_hdr) + skb->len > ep->tx_credit_size) {
 867		ath10k_dbg(ar, ATH10K_DBG_HTC, "tx exceed max len %d\n", skb->len);
 868		return -ENOMEM;
 869	}
 870
 871	ath10k_dbg(ar, ATH10K_DBG_HTC, "htc send hl eid %d bundle %d tx count %d len %d\n",
 872		   eid, ep->bundle_tx, skb_queue_len(&ep->tx_req_head), skb->len);
 873
 874	if (ep->bundle_tx) {
 875		skb_queue_tail(&ep->tx_req_head, skb);
 876		queue_work(ar->workqueue, &ar->bundle_tx_work);
 877		return 0;
 878	} else {
 879		return ath10k_htc_send(htc, eid, skb);
 880	}
 881}
 882
 883void ath10k_htc_setup_tx_req(struct ath10k_htc_ep *ep)
 884{
 885	if (ep->htc->max_msgs_per_htc_bundle >= ATH10K_MIN_MSG_PER_HTC_TX_BUNDLE &&
 886	    !ep->bundle_tx) {
 887		ep->bundle_tx = true;
 888		skb_queue_head_init(&ep->tx_req_head);
 889		skb_queue_head_init(&ep->tx_complete_head);
 890	}
 891}
 892
 893void ath10k_htc_stop_hl(struct ath10k *ar)
 894{
 895	struct ath10k_htc_ep *ep;
 896	int i;
 897
 898	cancel_work_sync(&ar->bundle_tx_work);
 899	cancel_work_sync(&ar->tx_complete_work);
 900
 901	for (i = 0; i < ARRAY_SIZE(ar->htc.endpoint); i++) {
 902		ep = &ar->htc.endpoint[i];
 903
 904		if (!ep->bundle_tx)
 905			continue;
 906
 907		ath10k_dbg(ar, ATH10K_DBG_HTC, "stop tx work eid %d count %d\n",
 908			   ep->eid, skb_queue_len(&ep->tx_req_head));
 909
 910		skb_queue_purge(&ep->tx_req_head);
 911	}
 912}
 913
 914int ath10k_htc_wait_target(struct ath10k_htc *htc)
 915{
 916	struct ath10k *ar = htc->ar;
 917	int i, status = 0;
 918	unsigned long time_left;
 919	struct ath10k_htc_msg *msg;
 920	u16 message_id;
 921
 922	time_left = wait_for_completion_timeout(&htc->ctl_resp,
 923						ATH10K_HTC_WAIT_TIMEOUT_HZ);
 924	if (!time_left) {
 925		/* Workaround: In some cases the PCI HIF doesn't
 926		 * receive interrupt for the control response message
 927		 * even if the buffer was completed. It is suspected
 928		 * iomap writes unmasking PCI CE irqs aren't propagated
 929		 * properly in KVM PCI-passthrough sometimes.
 930		 */
 931		ath10k_warn(ar, "failed to receive control response completion, polling..\n");
 932
 933		for (i = 0; i < CE_COUNT; i++)
 934			ath10k_hif_send_complete_check(htc->ar, i, 1);
 935
 936		time_left =
 937		wait_for_completion_timeout(&htc->ctl_resp,
 938					    ATH10K_HTC_WAIT_TIMEOUT_HZ);
 939
 940		if (!time_left)
 941			status = -ETIMEDOUT;
 942	}
 943
 944	if (status < 0) {
 945		ath10k_err(ar, "ctl_resp never came in (%d)\n", status);
 946		return status;
 947	}
 948
 949	if (htc->control_resp_len < sizeof(msg->hdr) + sizeof(msg->ready)) {
 950		ath10k_err(ar, "Invalid HTC ready msg len:%d\n",
 951			   htc->control_resp_len);
 952		return -ECOMM;
 953	}
 954
 955	msg = (struct ath10k_htc_msg *)htc->control_resp_buffer;
 956	message_id   = __le16_to_cpu(msg->hdr.message_id);
 957
 958	if (message_id != ATH10K_HTC_MSG_READY_ID) {
 959		ath10k_err(ar, "Invalid HTC ready msg: 0x%x\n", message_id);
 960		return -ECOMM;
 961	}
 962
 963	if (ar->hw_params.use_fw_tx_credits)
 964		htc->total_transmit_credits = __le16_to_cpu(msg->ready.credit_count);
 965	else
 966		htc->total_transmit_credits = 1;
 967
 968	htc->target_credit_size = __le16_to_cpu(msg->ready.credit_size);
 969
 970	ath10k_dbg(ar, ATH10K_DBG_HTC,
 971		   "Target ready! transmit resources: %d size:%d actual credits:%d\n",
 972		   htc->total_transmit_credits,
 973		   htc->target_credit_size,
 974		   msg->ready.credit_count);
 975
 976	if ((htc->total_transmit_credits == 0) ||
 977	    (htc->target_credit_size == 0)) {
 978		ath10k_err(ar, "Invalid credit size received\n");
 979		return -ECOMM;
 980	}
 981
 982	/* The only way to determine if the ready message is an extended
 983	 * message is from the size.
 984	 */
 985	if (htc->control_resp_len >=
 986	    sizeof(msg->hdr) + sizeof(msg->ready_ext)) {
 987		htc->alt_data_credit_size =
 988			__le16_to_cpu(msg->ready_ext.reserved) &
 989			ATH10K_HTC_MSG_READY_EXT_ALT_DATA_MASK;
 990		htc->max_msgs_per_htc_bundle =
 991			min_t(u8, msg->ready_ext.max_msgs_per_htc_bundle,
 992			      HTC_HOST_MAX_MSG_PER_RX_BUNDLE);
 993		ath10k_dbg(ar, ATH10K_DBG_HTC,
 994			   "Extended ready message RX bundle size %d alt size %d\n",
 995			   htc->max_msgs_per_htc_bundle,
 996			   htc->alt_data_credit_size);
 997	}
 998
 999	INIT_WORK(&ar->bundle_tx_work, ath10k_htc_bundle_tx_work);
1000	INIT_WORK(&ar->tx_complete_work, ath10k_htc_tx_complete_work);
1001
1002	return 0;
1003}
1004
1005void ath10k_htc_change_tx_credit_flow(struct ath10k_htc *htc,
1006				      enum ath10k_htc_ep_id eid,
1007				      bool enable)
1008{
1009	struct ath10k *ar = htc->ar;
1010	struct ath10k_htc_ep *ep = &ar->htc.endpoint[eid];
1011
1012	ep->tx_credit_flow_enabled = enable;
1013}
1014
1015int ath10k_htc_connect_service(struct ath10k_htc *htc,
1016			       struct ath10k_htc_svc_conn_req *conn_req,
1017			       struct ath10k_htc_svc_conn_resp *conn_resp)
1018{
1019	struct ath10k *ar = htc->ar;
1020	struct ath10k_htc_msg *msg;
1021	struct ath10k_htc_conn_svc *req_msg;
1022	struct ath10k_htc_conn_svc_response resp_msg_dummy;
1023	struct ath10k_htc_conn_svc_response *resp_msg = &resp_msg_dummy;
1024	enum ath10k_htc_ep_id assigned_eid = ATH10K_HTC_EP_COUNT;
1025	struct ath10k_htc_ep *ep;
1026	struct sk_buff *skb;
1027	unsigned int max_msg_size = 0;
1028	int length, status;
1029	unsigned long time_left;
1030	bool disable_credit_flow_ctrl = false;
1031	u16 message_id, service_id, flags = 0;
1032	u8 tx_alloc = 0;
1033
1034	/* special case for HTC pseudo control service */
1035	if (conn_req->service_id == ATH10K_HTC_SVC_ID_RSVD_CTRL) {
1036		disable_credit_flow_ctrl = true;
1037		assigned_eid = ATH10K_HTC_EP_0;
1038		max_msg_size = ATH10K_HTC_MAX_CTRL_MSG_LEN;
1039		memset(&resp_msg_dummy, 0, sizeof(resp_msg_dummy));
1040		goto setup;
1041	}
1042
1043	tx_alloc = ath10k_htc_get_credit_allocation(htc,
1044						    conn_req->service_id);
1045	if (!tx_alloc)
1046		ath10k_dbg(ar, ATH10K_DBG_BOOT,
1047			   "boot htc service %s does not allocate target credits\n",
1048			   htc_service_name(conn_req->service_id));
1049
1050	skb = ath10k_htc_build_tx_ctrl_skb(htc->ar);
1051	if (!skb) {
1052		ath10k_err(ar, "Failed to allocate HTC packet\n");
1053		return -ENOMEM;
1054	}
1055
1056	length = sizeof(msg->hdr) + sizeof(msg->connect_service);
1057	skb_put(skb, length);
1058	memset(skb->data, 0, length);
1059
1060	msg = (struct ath10k_htc_msg *)skb->data;
1061	msg->hdr.message_id =
1062		__cpu_to_le16(ATH10K_HTC_MSG_CONNECT_SERVICE_ID);
1063
1064	flags |= SM(tx_alloc, ATH10K_HTC_CONN_FLAGS_RECV_ALLOC);
1065
1066	/* Only enable credit flow control for WMI ctrl service */
1067	if (conn_req->service_id != ATH10K_HTC_SVC_ID_WMI_CONTROL) {
1068		flags |= ATH10K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL;
1069		disable_credit_flow_ctrl = true;
1070	}
1071
1072	req_msg = &msg->connect_service;
1073	req_msg->flags = __cpu_to_le16(flags);
1074	req_msg->service_id = __cpu_to_le16(conn_req->service_id);
1075
1076	reinit_completion(&htc->ctl_resp);
1077
1078	status = ath10k_htc_send(htc, ATH10K_HTC_EP_0, skb);
1079	if (status) {
1080		kfree_skb(skb);
1081		return status;
1082	}
1083
1084	/* wait for response */
1085	time_left = wait_for_completion_timeout(&htc->ctl_resp,
1086						ATH10K_HTC_CONN_SVC_TIMEOUT_HZ);
1087	if (!time_left) {
1088		ath10k_err(ar, "Service connect timeout\n");
1089		return -ETIMEDOUT;
1090	}
1091
1092	/* we controlled the buffer creation, it's aligned */
1093	msg = (struct ath10k_htc_msg *)htc->control_resp_buffer;
1094	resp_msg = &msg->connect_service_response;
1095	message_id = __le16_to_cpu(msg->hdr.message_id);
1096	service_id = __le16_to_cpu(resp_msg->service_id);
1097
1098	if ((message_id != ATH10K_HTC_MSG_CONNECT_SERVICE_RESP_ID) ||
1099	    (htc->control_resp_len < sizeof(msg->hdr) +
1100	     sizeof(msg->connect_service_response))) {
1101		ath10k_err(ar, "Invalid resp message ID 0x%x", message_id);
1102		return -EPROTO;
1103	}
1104
1105	ath10k_dbg(ar, ATH10K_DBG_HTC,
1106		   "HTC Service %s connect response: status: 0x%x, assigned ep: 0x%x\n",
1107		   htc_service_name(service_id),
1108		   resp_msg->status, resp_msg->eid);
1109
1110	conn_resp->connect_resp_code = resp_msg->status;
1111
1112	/* check response status */
1113	if (resp_msg->status != ATH10K_HTC_CONN_SVC_STATUS_SUCCESS) {
1114		ath10k_err(ar, "HTC Service %s connect request failed: 0x%x)\n",
1115			   htc_service_name(service_id),
1116			   resp_msg->status);
1117		return -EPROTO;
1118	}
1119
1120	assigned_eid = (enum ath10k_htc_ep_id)resp_msg->eid;
1121	max_msg_size = __le16_to_cpu(resp_msg->max_msg_size);
1122
1123setup:
1124
1125	if (assigned_eid >= ATH10K_HTC_EP_COUNT)
1126		return -EPROTO;
1127
1128	if (max_msg_size == 0)
1129		return -EPROTO;
1130
1131	ep = &htc->endpoint[assigned_eid];
1132	ep->eid = assigned_eid;
1133
1134	if (ep->service_id != ATH10K_HTC_SVC_ID_UNUSED)
1135		return -EPROTO;
1136
1137	/* return assigned endpoint to caller */
1138	conn_resp->eid = assigned_eid;
1139	conn_resp->max_msg_len = __le16_to_cpu(resp_msg->max_msg_size);
1140
1141	/* setup the endpoint */
1142	ep->service_id = conn_req->service_id;
1143	ep->max_tx_queue_depth = conn_req->max_send_queue_depth;
1144	ep->max_ep_message_len = __le16_to_cpu(resp_msg->max_msg_size);
1145	ep->tx_credits = tx_alloc;
1146	ep->tx_credit_size = htc->target_credit_size;
1147
1148	if (conn_req->service_id == ATH10K_HTC_SVC_ID_HTT_DATA_MSG &&
1149	    htc->alt_data_credit_size != 0)
1150		ep->tx_credit_size = htc->alt_data_credit_size;
1151
1152	/* copy all the callbacks */
1153	ep->ep_ops = conn_req->ep_ops;
1154
1155	status = ath10k_hif_map_service_to_pipe(htc->ar,
1156						ep->service_id,
1157						&ep->ul_pipe_id,
1158						&ep->dl_pipe_id);
1159	if (status) {
1160		ath10k_dbg(ar, ATH10K_DBG_BOOT, "unsupported HTC service id: %d\n",
1161			   ep->service_id);
1162		return status;
1163	}
1164
1165	ath10k_dbg(ar, ATH10K_DBG_BOOT,
1166		   "boot htc service '%s' ul pipe %d dl pipe %d eid %d ready\n",
1167		   htc_service_name(ep->service_id), ep->ul_pipe_id,
1168		   ep->dl_pipe_id, ep->eid);
1169
1170	if (disable_credit_flow_ctrl && ep->tx_credit_flow_enabled) {
1171		ep->tx_credit_flow_enabled = false;
1172		ath10k_dbg(ar, ATH10K_DBG_BOOT,
1173			   "boot htc service '%s' eid %d TX flow control disabled\n",
1174			   htc_service_name(ep->service_id), assigned_eid);
1175	}
1176
1177	return status;
1178}
1179
1180struct sk_buff *ath10k_htc_alloc_skb(struct ath10k *ar, int size)
1181{
1182	struct sk_buff *skb;
1183
1184	skb = dev_alloc_skb(size + sizeof(struct ath10k_htc_hdr));
1185	if (!skb)
1186		return NULL;
1187
1188	skb_reserve(skb, sizeof(struct ath10k_htc_hdr));
1189
1190	/* FW/HTC requires 4-byte aligned streams */
1191	if (!IS_ALIGNED((unsigned long)skb->data, 4))
1192		ath10k_warn(ar, "Unaligned HTC tx skb\n");
1193
1194	return skb;
1195}
1196
1197static void ath10k_htc_pktlog_process_rx(struct ath10k *ar, struct sk_buff *skb)
1198{
1199	trace_ath10k_htt_pktlog(ar, skb->data, skb->len);
1200	dev_kfree_skb_any(skb);
1201}
1202
1203static int ath10k_htc_pktlog_connect(struct ath10k *ar)
1204{
1205	struct ath10k_htc_svc_conn_resp conn_resp;
1206	struct ath10k_htc_svc_conn_req conn_req;
1207	int status;
1208
1209	memset(&conn_req, 0, sizeof(conn_req));
1210	memset(&conn_resp, 0, sizeof(conn_resp));
1211
1212	conn_req.ep_ops.ep_tx_complete = NULL;
1213	conn_req.ep_ops.ep_rx_complete = ath10k_htc_pktlog_process_rx;
1214	conn_req.ep_ops.ep_tx_credits = NULL;
1215
1216	/* connect to control service */
1217	conn_req.service_id = ATH10K_HTC_SVC_ID_HTT_LOG_MSG;
1218	status = ath10k_htc_connect_service(&ar->htc, &conn_req, &conn_resp);
1219	if (status) {
1220		ath10k_warn(ar, "failed to connect to PKTLOG service: %d\n",
1221			    status);
1222		return status;
1223	}
1224
1225	return 0;
1226}
1227
1228static bool ath10k_htc_pktlog_svc_supported(struct ath10k *ar)
1229{
1230	u8 ul_pipe_id;
1231	u8 dl_pipe_id;
1232	int status;
1233
1234	status = ath10k_hif_map_service_to_pipe(ar, ATH10K_HTC_SVC_ID_HTT_LOG_MSG,
1235						&ul_pipe_id,
1236						&dl_pipe_id);
1237	if (status) {
1238		ath10k_dbg(ar, ATH10K_DBG_BOOT, "unsupported HTC pktlog service id: %d\n",
1239			   ATH10K_HTC_SVC_ID_HTT_LOG_MSG);
1240
1241		return false;
1242	}
1243
1244	return true;
1245}
1246
1247int ath10k_htc_start(struct ath10k_htc *htc)
1248{
1249	struct ath10k *ar = htc->ar;
1250	struct sk_buff *skb;
1251	int status = 0;
1252	struct ath10k_htc_msg *msg;
1253
1254	skb = ath10k_htc_build_tx_ctrl_skb(htc->ar);
1255	if (!skb)
1256		return -ENOMEM;
1257
1258	skb_put(skb, sizeof(msg->hdr) + sizeof(msg->setup_complete_ext));
1259	memset(skb->data, 0, skb->len);
1260
1261	msg = (struct ath10k_htc_msg *)skb->data;
1262	msg->hdr.message_id =
1263		__cpu_to_le16(ATH10K_HTC_MSG_SETUP_COMPLETE_EX_ID);
1264
1265	if (ar->hif.bus == ATH10K_BUS_SDIO) {
1266		/* Extra setup params used by SDIO */
1267		msg->setup_complete_ext.flags =
1268			__cpu_to_le32(ATH10K_HTC_SETUP_COMPLETE_FLAGS_RX_BNDL_EN);
1269		msg->setup_complete_ext.max_msgs_per_bundled_recv =
1270			htc->max_msgs_per_htc_bundle;
1271	}
1272	ath10k_dbg(ar, ATH10K_DBG_HTC, "HTC is using TX credit flow control\n");
1273
1274	status = ath10k_htc_send(htc, ATH10K_HTC_EP_0, skb);
1275	if (status) {
1276		kfree_skb(skb);
1277		return status;
1278	}
1279
1280	if (ath10k_htc_pktlog_svc_supported(ar)) {
1281		status = ath10k_htc_pktlog_connect(ar);
1282		if (status) {
1283			ath10k_err(ar, "failed to connect to pktlog: %d\n", status);
1284			return status;
1285		}
1286	}
1287
1288	return 0;
1289}
1290
1291/* registered target arrival callback from the HIF layer */
1292int ath10k_htc_init(struct ath10k *ar)
1293{
1294	int status;
1295	struct ath10k_htc *htc = &ar->htc;
1296	struct ath10k_htc_svc_conn_req conn_req;
1297	struct ath10k_htc_svc_conn_resp conn_resp;
1298
1299	spin_lock_init(&htc->tx_lock);
1300
1301	ath10k_htc_reset_endpoint_states(htc);
1302
1303	htc->ar = ar;
1304
1305	/* setup our pseudo HTC control endpoint connection */
1306	memset(&conn_req, 0, sizeof(conn_req));
1307	memset(&conn_resp, 0, sizeof(conn_resp));
1308	conn_req.ep_ops.ep_tx_complete = ath10k_htc_control_tx_complete;
1309	conn_req.ep_ops.ep_rx_complete = ath10k_htc_control_rx_complete;
1310	conn_req.max_send_queue_depth = ATH10K_NUM_CONTROL_TX_BUFFERS;
1311	conn_req.service_id = ATH10K_HTC_SVC_ID_RSVD_CTRL;
1312
1313	/* connect fake service */
1314	status = ath10k_htc_connect_service(htc, &conn_req, &conn_resp);
1315	if (status) {
1316		ath10k_err(ar, "could not connect to htc service (%d)\n",
1317			   status);
1318		return status;
1319	}
1320
1321	init_completion(&htc->ctl_resp);
1322
1323	return 0;
1324}