1/* 2 * Copyright (c) 2007-2011 Atheros Communications Inc. 3 * Copyright (c) 2011-2012 Qualcomm Atheros, Inc. 4 * 5 * Permission to use, copy, modify, and/or distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18#include "core.h" 19#include "hif.h" 20#include "debug.h" 21#include "hif-ops.h" 22#include "trace.h" 23 24#include <asm/unaligned.h> 25 26#define CALC_TXRX_PADDED_LEN(dev, len) (__ALIGN_MASK((len), (dev)->block_mask)) 27 28static void ath6kl_htc_mbox_cleanup(struct htc_target *target); 29static void ath6kl_htc_mbox_stop(struct htc_target *target); 30static int ath6kl_htc_mbox_add_rxbuf_multiple(struct htc_target *target, 31 struct list_head *pkt_queue); 32static void ath6kl_htc_set_credit_dist(struct htc_target *target, 33 struct ath6kl_htc_credit_info *cred_info, 34 u16 svc_pri_order[], int len); 35 36/* threshold to re-enable Tx bundling for an AC*/ 37#define TX_RESUME_BUNDLE_THRESHOLD 1500 38 39/* Functions for Tx credit handling */ 40static void ath6kl_credit_deposit(struct ath6kl_htc_credit_info *cred_info, 41 struct htc_endpoint_credit_dist *ep_dist, 42 int credits) 43{ 44 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit deposit ep %d credits %d\n", 45 ep_dist->endpoint, credits); 46 47 ep_dist->credits += credits; 48 ep_dist->cred_assngd += credits; 49 cred_info->cur_free_credits -= credits; 50} 51 52static void ath6kl_credit_init(struct ath6kl_htc_credit_info *cred_info, 53 struct list_head *ep_list, 54 int tot_credits) 55{ 56 struct htc_endpoint_credit_dist *cur_ep_dist; 57 int count; 58 59 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit init total %d\n", tot_credits); 60 61 cred_info->cur_free_credits = tot_credits; 62 cred_info->total_avail_credits = tot_credits; 63 64 list_for_each_entry(cur_ep_dist, ep_list, list) { 65 if (cur_ep_dist->endpoint == ENDPOINT_0) 66 continue; 67 68 cur_ep_dist->cred_min = cur_ep_dist->cred_per_msg; 69 70 if (tot_credits > 4) { 71 if ((cur_ep_dist->svc_id == WMI_DATA_BK_SVC) || 72 (cur_ep_dist->svc_id == WMI_DATA_BE_SVC)) { 73 ath6kl_credit_deposit(cred_info, 74 cur_ep_dist, 75 cur_ep_dist->cred_min); 76 cur_ep_dist->dist_flags |= HTC_EP_ACTIVE; 77 } 78 } 79 80 if (cur_ep_dist->svc_id == WMI_CONTROL_SVC) { 81 ath6kl_credit_deposit(cred_info, cur_ep_dist, 82 cur_ep_dist->cred_min); 83 /* 84 * Control service is always marked active, it 85 * never goes inactive EVER. 86 */ 87 cur_ep_dist->dist_flags |= HTC_EP_ACTIVE; 88 } 89 90 /* 91 * Streams have to be created (explicit | implicit) for all 92 * kinds of traffic. BE endpoints are also inactive in the 93 * beginning. When BE traffic starts it creates implicit 94 * streams that redistributes credits. 95 * 96 * Note: all other endpoints have minimums set but are 97 * initially given NO credits. credits will be distributed 98 * as traffic activity demands 99 */ 100 } 101 102 /* 103 * For ath6kl_credit_seek function, 104 * it use list_for_each_entry_reverse to walk around the whole ep list. 105 * Therefore assign this lowestpri_ep_dist after walk around the ep_list 106 */ 107 cred_info->lowestpri_ep_dist = cur_ep_dist->list; 108 109 WARN_ON(cred_info->cur_free_credits <= 0); 110 111 list_for_each_entry(cur_ep_dist, ep_list, list) { 112 if (cur_ep_dist->endpoint == ENDPOINT_0) 113 continue; 114 115 if (cur_ep_dist->svc_id == WMI_CONTROL_SVC) { 116 cur_ep_dist->cred_norm = cur_ep_dist->cred_per_msg; 117 } else { 118 /* 119 * For the remaining data endpoints, we assume that 120 * each cred_per_msg are the same. We use a simple 121 * calculation here, we take the remaining credits 122 * and determine how many max messages this can 123 * cover and then set each endpoint's normal value 124 * equal to 3/4 this amount. 125 */ 126 count = (cred_info->cur_free_credits / 127 cur_ep_dist->cred_per_msg) 128 * cur_ep_dist->cred_per_msg; 129 count = (count * 3) >> 2; 130 count = max(count, cur_ep_dist->cred_per_msg); 131 cur_ep_dist->cred_norm = count; 132 } 133 134 ath6kl_dbg(ATH6KL_DBG_CREDIT, 135 "credit ep %d svc_id %d credits %d per_msg %d norm %d min %d\n", 136 cur_ep_dist->endpoint, 137 cur_ep_dist->svc_id, 138 cur_ep_dist->credits, 139 cur_ep_dist->cred_per_msg, 140 cur_ep_dist->cred_norm, 141 cur_ep_dist->cred_min); 142 } 143} 144 145/* initialize and setup credit distribution */ 146static int ath6kl_htc_mbox_credit_setup(struct htc_target *htc_target, 147 struct ath6kl_htc_credit_info *cred_info) 148{ 149 u16 servicepriority[5]; 150 151 memset(cred_info, 0, sizeof(struct ath6kl_htc_credit_info)); 152 153 servicepriority[0] = WMI_CONTROL_SVC; /* highest */ 154 servicepriority[1] = WMI_DATA_VO_SVC; 155 servicepriority[2] = WMI_DATA_VI_SVC; 156 servicepriority[3] = WMI_DATA_BE_SVC; 157 servicepriority[4] = WMI_DATA_BK_SVC; /* lowest */ 158 159 /* set priority list */ 160 ath6kl_htc_set_credit_dist(htc_target, cred_info, servicepriority, 5); 161 162 return 0; 163} 164 165/* reduce an ep's credits back to a set limit */ 166static void ath6kl_credit_reduce(struct ath6kl_htc_credit_info *cred_info, 167 struct htc_endpoint_credit_dist *ep_dist, 168 int limit) 169{ 170 int credits; 171 172 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit reduce ep %d limit %d\n", 173 ep_dist->endpoint, limit); 174 175 ep_dist->cred_assngd = limit; 176 177 if (ep_dist->credits <= limit) 178 return; 179 180 credits = ep_dist->credits - limit; 181 ep_dist->credits -= credits; 182 cred_info->cur_free_credits += credits; 183} 184 185static void ath6kl_credit_update(struct ath6kl_htc_credit_info *cred_info, 186 struct list_head *epdist_list) 187{ 188 struct htc_endpoint_credit_dist *cur_list; 189 190 list_for_each_entry(cur_list, epdist_list, list) { 191 if (cur_list->endpoint == ENDPOINT_0) 192 continue; 193 194 if (cur_list->cred_to_dist > 0) { 195 cur_list->credits += cur_list->cred_to_dist; 196 cur_list->cred_to_dist = 0; 197 198 if (cur_list->credits > cur_list->cred_assngd) 199 ath6kl_credit_reduce(cred_info, 200 cur_list, 201 cur_list->cred_assngd); 202 203 if (cur_list->credits > cur_list->cred_norm) 204 ath6kl_credit_reduce(cred_info, cur_list, 205 cur_list->cred_norm); 206 207 if (!(cur_list->dist_flags & HTC_EP_ACTIVE)) { 208 if (cur_list->txq_depth == 0) 209 ath6kl_credit_reduce(cred_info, 210 cur_list, 0); 211 } 212 } 213 } 214} 215 216/* 217 * HTC has an endpoint that needs credits, ep_dist is the endpoint in 218 * question. 219 */ 220static void ath6kl_credit_seek(struct ath6kl_htc_credit_info *cred_info, 221 struct htc_endpoint_credit_dist *ep_dist) 222{ 223 struct htc_endpoint_credit_dist *curdist_list; 224 int credits = 0; 225 int need; 226 227 if (ep_dist->svc_id == WMI_CONTROL_SVC) 228 goto out; 229 230 if ((ep_dist->svc_id == WMI_DATA_VI_SVC) || 231 (ep_dist->svc_id == WMI_DATA_VO_SVC)) 232 if ((ep_dist->cred_assngd >= ep_dist->cred_norm)) 233 goto out; 234 235 /* 236 * For all other services, we follow a simple algorithm of: 237 * 238 * 1. checking the free pool for credits 239 * 2. checking lower priority endpoints for credits to take 240 */ 241 242 credits = min(cred_info->cur_free_credits, ep_dist->seek_cred); 243 244 if (credits >= ep_dist->seek_cred) 245 goto out; 246 247 /* 248 * We don't have enough in the free pool, try taking away from 249 * lower priority services The rule for taking away credits: 250 * 251 * 1. Only take from lower priority endpoints 252 * 2. Only take what is allocated above the minimum (never 253 * starve an endpoint completely) 254 * 3. Only take what you need. 255 */ 256 257 list_for_each_entry_reverse(curdist_list, 258 &cred_info->lowestpri_ep_dist, 259 list) { 260 if (curdist_list == ep_dist) 261 break; 262 263 need = ep_dist->seek_cred - cred_info->cur_free_credits; 264 265 if ((curdist_list->cred_assngd - need) >= 266 curdist_list->cred_min) { 267 /* 268 * The current one has been allocated more than 269 * it's minimum and it has enough credits assigned 270 * above it's minimum to fulfill our need try to 271 * take away just enough to fulfill our need. 272 */ 273 ath6kl_credit_reduce(cred_info, curdist_list, 274 curdist_list->cred_assngd - need); 275 276 if (cred_info->cur_free_credits >= 277 ep_dist->seek_cred) 278 break; 279 } 280 281 if (curdist_list->endpoint == ENDPOINT_0) 282 break; 283 } 284 285 credits = min(cred_info->cur_free_credits, ep_dist->seek_cred); 286 287out: 288 /* did we find some credits? */ 289 if (credits) 290 ath6kl_credit_deposit(cred_info, ep_dist, credits); 291 292 ep_dist->seek_cred = 0; 293} 294 295/* redistribute credits based on activity change */ 296static void ath6kl_credit_redistribute(struct ath6kl_htc_credit_info *info, 297 struct list_head *ep_dist_list) 298{ 299 struct htc_endpoint_credit_dist *curdist_list; 300 301 list_for_each_entry(curdist_list, ep_dist_list, list) { 302 if (curdist_list->endpoint == ENDPOINT_0) 303 continue; 304 305 if ((curdist_list->svc_id == WMI_DATA_BK_SVC) || 306 (curdist_list->svc_id == WMI_DATA_BE_SVC)) 307 curdist_list->dist_flags |= HTC_EP_ACTIVE; 308 309 if ((curdist_list->svc_id != WMI_CONTROL_SVC) && 310 !(curdist_list->dist_flags & HTC_EP_ACTIVE)) { 311 if (curdist_list->txq_depth == 0) 312 ath6kl_credit_reduce(info, curdist_list, 0); 313 else 314 ath6kl_credit_reduce(info, 315 curdist_list, 316 curdist_list->cred_min); 317 } 318 } 319} 320 321/* 322 * 323 * This function is invoked whenever endpoints require credit 324 * distributions. A lock is held while this function is invoked, this 325 * function shall NOT block. The ep_dist_list is a list of distribution 326 * structures in prioritized order as defined by the call to the 327 * htc_set_credit_dist() api. 328 */ 329static void ath6kl_credit_distribute(struct ath6kl_htc_credit_info *cred_info, 330 struct list_head *ep_dist_list, 331 enum htc_credit_dist_reason reason) 332{ 333 switch (reason) { 334 case HTC_CREDIT_DIST_SEND_COMPLETE: 335 ath6kl_credit_update(cred_info, ep_dist_list); 336 break; 337 case HTC_CREDIT_DIST_ACTIVITY_CHANGE: 338 ath6kl_credit_redistribute(cred_info, ep_dist_list); 339 break; 340 default: 341 break; 342 } 343 344 WARN_ON(cred_info->cur_free_credits > cred_info->total_avail_credits); 345 WARN_ON(cred_info->cur_free_credits < 0); 346} 347 348static void ath6kl_htc_tx_buf_align(u8 **buf, unsigned long len) 349{ 350 u8 *align_addr; 351 352 if (!IS_ALIGNED((unsigned long) *buf, 4)) { 353 align_addr = PTR_ALIGN(*buf - 4, 4); 354 memmove(align_addr, *buf, len); 355 *buf = align_addr; 356 } 357} 358 359static void ath6kl_htc_tx_prep_pkt(struct htc_packet *packet, u8 flags, 360 int ctrl0, int ctrl1) 361{ 362 struct htc_frame_hdr *hdr; 363 364 packet->buf -= HTC_HDR_LENGTH; 365 hdr = (struct htc_frame_hdr *)packet->buf; 366 367 /* Endianess? */ 368 put_unaligned((u16)packet->act_len, &hdr->payld_len); 369 hdr->flags = flags; 370 hdr->eid = packet->endpoint; 371 hdr->ctrl[0] = ctrl0; 372 hdr->ctrl[1] = ctrl1; 373} 374 375static void htc_reclaim_txctrl_buf(struct htc_target *target, 376 struct htc_packet *pkt) 377{ 378 spin_lock_bh(&target->htc_lock); 379 list_add_tail(&pkt->list, &target->free_ctrl_txbuf); 380 spin_unlock_bh(&target->htc_lock); 381} 382 383static struct htc_packet *htc_get_control_buf(struct htc_target *target, 384 bool tx) 385{ 386 struct htc_packet *packet = NULL; 387 struct list_head *buf_list; 388 389 buf_list = tx ? &target->free_ctrl_txbuf : &target->free_ctrl_rxbuf; 390 391 spin_lock_bh(&target->htc_lock); 392 393 if (list_empty(buf_list)) { 394 spin_unlock_bh(&target->htc_lock); 395 return NULL; 396 } 397 398 packet = list_first_entry(buf_list, struct htc_packet, list); 399 list_del(&packet->list); 400 spin_unlock_bh(&target->htc_lock); 401 402 if (tx) 403 packet->buf = packet->buf_start + HTC_HDR_LENGTH; 404 405 return packet; 406} 407 408static void htc_tx_comp_update(struct htc_target *target, 409 struct htc_endpoint *endpoint, 410 struct htc_packet *packet) 411{ 412 packet->completion = NULL; 413 packet->buf += HTC_HDR_LENGTH; 414 415 if (!packet->status) 416 return; 417 418 ath6kl_err("req failed (status:%d, ep:%d, len:%d creds:%d)\n", 419 packet->status, packet->endpoint, packet->act_len, 420 packet->info.tx.cred_used); 421 422 /* on failure to submit, reclaim credits for this packet */ 423 spin_lock_bh(&target->tx_lock); 424 endpoint->cred_dist.cred_to_dist += 425 packet->info.tx.cred_used; 426 endpoint->cred_dist.txq_depth = get_queue_depth(&endpoint->txq); 427 428 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx ctxt 0x%p dist 0x%p\n", 429 target->credit_info, &target->cred_dist_list); 430 431 ath6kl_credit_distribute(target->credit_info, 432 &target->cred_dist_list, 433 HTC_CREDIT_DIST_SEND_COMPLETE); 434 435 spin_unlock_bh(&target->tx_lock); 436} 437 438static void htc_tx_complete(struct htc_endpoint *endpoint, 439 struct list_head *txq) 440{ 441 if (list_empty(txq)) 442 return; 443 444 ath6kl_dbg(ATH6KL_DBG_HTC, 445 "htc tx complete ep %d pkts %d\n", 446 endpoint->eid, get_queue_depth(txq)); 447 448 ath6kl_tx_complete(endpoint->target, txq); 449} 450 451static void htc_tx_comp_handler(struct htc_target *target, 452 struct htc_packet *packet) 453{ 454 struct htc_endpoint *endpoint = &target->endpoint[packet->endpoint]; 455 struct list_head container; 456 457 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx complete seqno %d\n", 458 packet->info.tx.seqno); 459 460 htc_tx_comp_update(target, endpoint, packet); 461 INIT_LIST_HEAD(&container); 462 list_add_tail(&packet->list, &container); 463 /* do completion */ 464 htc_tx_complete(endpoint, &container); 465} 466 467static void htc_async_tx_scat_complete(struct htc_target *target, 468 struct hif_scatter_req *scat_req) 469{ 470 struct htc_endpoint *endpoint; 471 struct htc_packet *packet; 472 struct list_head tx_compq; 473 int i; 474 475 INIT_LIST_HEAD(&tx_compq); 476 477 ath6kl_dbg(ATH6KL_DBG_HTC, 478 "htc tx scat complete len %d entries %d\n", 479 scat_req->len, scat_req->scat_entries); 480 481 if (scat_req->status) 482 ath6kl_err("send scatter req failed: %d\n", scat_req->status); 483 484 packet = scat_req->scat_list[0].packet; 485 endpoint = &target->endpoint[packet->endpoint]; 486 487 /* walk through the scatter list and process */ 488 for (i = 0; i < scat_req->scat_entries; i++) { 489 packet = scat_req->scat_list[i].packet; 490 if (!packet) { 491 WARN_ON(1); 492 return; 493 } 494 495 packet->status = scat_req->status; 496 htc_tx_comp_update(target, endpoint, packet); 497 list_add_tail(&packet->list, &tx_compq); 498 } 499 500 /* free scatter request */ 501 hif_scatter_req_add(target->dev->ar, scat_req); 502 503 /* complete all packets */ 504 htc_tx_complete(endpoint, &tx_compq); 505} 506 507static int ath6kl_htc_tx_issue(struct htc_target *target, 508 struct htc_packet *packet) 509{ 510 int status; 511 bool sync = false; 512 u32 padded_len, send_len; 513 514 if (!packet->completion) 515 sync = true; 516 517 send_len = packet->act_len + HTC_HDR_LENGTH; 518 519 padded_len = CALC_TXRX_PADDED_LEN(target, send_len); 520 521 ath6kl_dbg(ATH6KL_DBG_HTC, 522 "htc tx issue len %d seqno %d padded_len %d mbox 0x%X %s\n", 523 send_len, packet->info.tx.seqno, padded_len, 524 target->dev->ar->mbox_info.htc_addr, 525 sync ? "sync" : "async"); 526 527 if (sync) { 528 status = hif_read_write_sync(target->dev->ar, 529 target->dev->ar->mbox_info.htc_addr, 530 packet->buf, padded_len, 531 HIF_WR_SYNC_BLOCK_INC); 532 533 packet->status = status; 534 packet->buf += HTC_HDR_LENGTH; 535 } else 536 status = hif_write_async(target->dev->ar, 537 target->dev->ar->mbox_info.htc_addr, 538 packet->buf, padded_len, 539 HIF_WR_ASYNC_BLOCK_INC, packet); 540 541 trace_ath6kl_htc_tx(status, packet->endpoint, packet->buf, send_len); 542 543 return status; 544} 545 546static int htc_check_credits(struct htc_target *target, 547 struct htc_endpoint *ep, u8 *flags, 548 enum htc_endpoint_id eid, unsigned int len, 549 int *req_cred) 550{ 551 *req_cred = (len > target->tgt_cred_sz) ? 552 DIV_ROUND_UP(len, target->tgt_cred_sz) : 1; 553 554 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit check need %d got %d\n", 555 *req_cred, ep->cred_dist.credits); 556 557 if (ep->cred_dist.credits < *req_cred) { 558 if (eid == ENDPOINT_0) 559 return -EINVAL; 560 561 /* Seek more credits */ 562 ep->cred_dist.seek_cred = *req_cred - ep->cred_dist.credits; 563 564 ath6kl_credit_seek(target->credit_info, &ep->cred_dist); 565 566 ep->cred_dist.seek_cred = 0; 567 568 if (ep->cred_dist.credits < *req_cred) { 569 ath6kl_dbg(ATH6KL_DBG_CREDIT, 570 "credit not found for ep %d\n", 571 eid); 572 return -EINVAL; 573 } 574 } 575 576 ep->cred_dist.credits -= *req_cred; 577 ep->ep_st.cred_cosumd += *req_cred; 578 579 /* When we are getting low on credits, ask for more */ 580 if (ep->cred_dist.credits < ep->cred_dist.cred_per_msg) { 581 ep->cred_dist.seek_cred = 582 ep->cred_dist.cred_per_msg - ep->cred_dist.credits; 583 584 ath6kl_credit_seek(target->credit_info, &ep->cred_dist); 585 586 /* see if we were successful in getting more */ 587 if (ep->cred_dist.credits < ep->cred_dist.cred_per_msg) { 588 /* tell the target we need credits ASAP! */ 589 *flags |= HTC_FLAGS_NEED_CREDIT_UPDATE; 590 ep->ep_st.cred_low_indicate += 1; 591 ath6kl_dbg(ATH6KL_DBG_CREDIT, 592 "credit we need credits asap\n"); 593 } 594 } 595 596 return 0; 597} 598 599static void ath6kl_htc_tx_pkts_get(struct htc_target *target, 600 struct htc_endpoint *endpoint, 601 struct list_head *queue) 602{ 603 int req_cred; 604 u8 flags; 605 struct htc_packet *packet; 606 unsigned int len; 607 608 while (true) { 609 flags = 0; 610 611 if (list_empty(&endpoint->txq)) 612 break; 613 packet = list_first_entry(&endpoint->txq, struct htc_packet, 614 list); 615 616 ath6kl_dbg(ATH6KL_DBG_HTC, 617 "htc tx got packet 0x%p queue depth %d\n", 618 packet, get_queue_depth(&endpoint->txq)); 619 620 len = CALC_TXRX_PADDED_LEN(target, 621 packet->act_len + HTC_HDR_LENGTH); 622 623 if (htc_check_credits(target, endpoint, &flags, 624 packet->endpoint, len, &req_cred)) 625 break; 626 627 /* now we can fully move onto caller's queue */ 628 packet = list_first_entry(&endpoint->txq, struct htc_packet, 629 list); 630 list_move_tail(&packet->list, queue); 631 632 /* save the number of credits this packet consumed */ 633 packet->info.tx.cred_used = req_cred; 634 635 /* all TX packets are handled asynchronously */ 636 packet->completion = htc_tx_comp_handler; 637 packet->context = target; 638 endpoint->ep_st.tx_issued += 1; 639 640 /* save send flags */ 641 packet->info.tx.flags = flags; 642 packet->info.tx.seqno = endpoint->seqno; 643 endpoint->seqno++; 644 } 645} 646 647/* See if the padded tx length falls on a credit boundary */ 648static int htc_get_credit_padding(unsigned int cred_sz, int *len, 649 struct htc_endpoint *ep) 650{ 651 int rem_cred, cred_pad; 652 653 rem_cred = *len % cred_sz; 654 655 /* No padding needed */ 656 if (!rem_cred) 657 return 0; 658 659 if (!(ep->conn_flags & HTC_FLGS_TX_BNDL_PAD_EN)) 660 return -1; 661 662 /* 663 * The transfer consumes a "partial" credit, this 664 * packet cannot be bundled unless we add 665 * additional "dummy" padding (max 255 bytes) to 666 * consume the entire credit. 667 */ 668 cred_pad = *len < cred_sz ? (cred_sz - *len) : rem_cred; 669 670 if ((cred_pad > 0) && (cred_pad <= 255)) 671 *len += cred_pad; 672 else 673 /* The amount of padding is too large, send as non-bundled */ 674 return -1; 675 676 return cred_pad; 677} 678 679static int ath6kl_htc_tx_setup_scat_list(struct htc_target *target, 680 struct htc_endpoint *endpoint, 681 struct hif_scatter_req *scat_req, 682 int n_scat, 683 struct list_head *queue) 684{ 685 struct htc_packet *packet; 686 int i, len, rem_scat, cred_pad; 687 int status = 0; 688 u8 flags; 689 690 rem_scat = target->max_tx_bndl_sz; 691 692 for (i = 0; i < n_scat; i++) { 693 scat_req->scat_list[i].packet = NULL; 694 695 if (list_empty(queue)) 696 break; 697 698 packet = list_first_entry(queue, struct htc_packet, list); 699 len = CALC_TXRX_PADDED_LEN(target, 700 packet->act_len + HTC_HDR_LENGTH); 701 702 cred_pad = htc_get_credit_padding(target->tgt_cred_sz, 703 &len, endpoint); 704 if (cred_pad < 0 || rem_scat < len) { 705 status = -ENOSPC; 706 break; 707 } 708 709 rem_scat -= len; 710 /* now remove it from the queue */ 711 list_del(&packet->list); 712 713 scat_req->scat_list[i].packet = packet; 714 /* prepare packet and flag message as part of a send bundle */ 715 flags = packet->info.tx.flags | HTC_FLAGS_SEND_BUNDLE; 716 ath6kl_htc_tx_prep_pkt(packet, flags, 717 cred_pad, packet->info.tx.seqno); 718 /* Make sure the buffer is 4-byte aligned */ 719 ath6kl_htc_tx_buf_align(&packet->buf, 720 packet->act_len + HTC_HDR_LENGTH); 721 scat_req->scat_list[i].buf = packet->buf; 722 scat_req->scat_list[i].len = len; 723 724 scat_req->len += len; 725 scat_req->scat_entries++; 726 ath6kl_dbg(ATH6KL_DBG_HTC, 727 "htc tx adding (%d) pkt 0x%p seqno %d len %d remaining %d\n", 728 i, packet, packet->info.tx.seqno, len, rem_scat); 729 } 730 731 /* Roll back scatter setup in case of any failure */ 732 if (scat_req->scat_entries < HTC_MIN_HTC_MSGS_TO_BUNDLE) { 733 for (i = scat_req->scat_entries - 1; i >= 0; i--) { 734 packet = scat_req->scat_list[i].packet; 735 if (packet) { 736 packet->buf += HTC_HDR_LENGTH; 737 list_add(&packet->list, queue); 738 } 739 } 740 return -EAGAIN; 741 } 742 743 return status; 744} 745 746/* 747 * Drain a queue and send as bundles this function may return without fully 748 * draining the queue when 749 * 750 * 1. scatter resources are exhausted 751 * 2. a message that will consume a partial credit will stop the 752 * bundling process early 753 * 3. we drop below the minimum number of messages for a bundle 754 */ 755static void ath6kl_htc_tx_bundle(struct htc_endpoint *endpoint, 756 struct list_head *queue, 757 int *sent_bundle, int *n_bundle_pkts) 758{ 759 struct htc_target *target = endpoint->target; 760 struct hif_scatter_req *scat_req = NULL; 761 int n_scat, n_sent_bundle = 0, tot_pkts_bundle = 0, i; 762 struct htc_packet *packet; 763 int status; 764 u32 txb_mask; 765 u8 ac = WMM_NUM_AC; 766 767 if ((HTC_CTRL_RSVD_SVC != endpoint->svc_id) && 768 (WMI_CONTROL_SVC != endpoint->svc_id)) 769 ac = target->dev->ar->ep2ac_map[endpoint->eid]; 770 771 while (true) { 772 status = 0; 773 n_scat = get_queue_depth(queue); 774 n_scat = min(n_scat, target->msg_per_bndl_max); 775 776 if (n_scat < HTC_MIN_HTC_MSGS_TO_BUNDLE) 777 /* not enough to bundle */ 778 break; 779 780 scat_req = hif_scatter_req_get(target->dev->ar); 781 782 if (!scat_req) { 783 /* no scatter resources */ 784 ath6kl_dbg(ATH6KL_DBG_HTC, 785 "htc tx no more scatter resources\n"); 786 break; 787 } 788 789 if ((ac < WMM_NUM_AC) && (ac != WMM_AC_BK)) { 790 if (WMM_AC_BE == ac) 791 /* 792 * BE, BK have priorities and bit 793 * positions reversed 794 */ 795 txb_mask = (1 << WMM_AC_BK); 796 else 797 /* 798 * any AC with priority lower than 799 * itself 800 */ 801 txb_mask = ((1 << ac) - 1); 802 803 /* 804 * when the scatter request resources drop below a 805 * certain threshold, disable Tx bundling for all 806 * AC's with priority lower than the current requesting 807 * AC. Otherwise re-enable Tx bundling for them 808 */ 809 if (scat_req->scat_q_depth < ATH6KL_SCATTER_REQS) 810 target->tx_bndl_mask &= ~txb_mask; 811 else 812 target->tx_bndl_mask |= txb_mask; 813 } 814 815 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx pkts to scatter: %d\n", 816 n_scat); 817 818 scat_req->len = 0; 819 scat_req->scat_entries = 0; 820 821 status = ath6kl_htc_tx_setup_scat_list(target, endpoint, 822 scat_req, n_scat, 823 queue); 824 if (status == -EAGAIN) { 825 hif_scatter_req_add(target->dev->ar, scat_req); 826 break; 827 } 828 829 /* send path is always asynchronous */ 830 scat_req->complete = htc_async_tx_scat_complete; 831 n_sent_bundle++; 832 tot_pkts_bundle += scat_req->scat_entries; 833 834 ath6kl_dbg(ATH6KL_DBG_HTC, 835 "htc tx scatter bytes %d entries %d\n", 836 scat_req->len, scat_req->scat_entries); 837 838 for (i = 0; i < scat_req->scat_entries; i++) { 839 packet = scat_req->scat_list[i].packet; 840 trace_ath6kl_htc_tx(packet->status, packet->endpoint, 841 packet->buf, packet->act_len); 842 } 843 844 ath6kl_hif_submit_scat_req(target->dev, scat_req, false); 845 846 if (status) 847 break; 848 } 849 850 *sent_bundle = n_sent_bundle; 851 *n_bundle_pkts = tot_pkts_bundle; 852 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx bundle sent %d pkts\n", 853 n_sent_bundle); 854 855 return; 856} 857 858static void ath6kl_htc_tx_from_queue(struct htc_target *target, 859 struct htc_endpoint *endpoint) 860{ 861 struct list_head txq; 862 struct htc_packet *packet; 863 int bundle_sent; 864 int n_pkts_bundle; 865 u8 ac = WMM_NUM_AC; 866 int status; 867 868 spin_lock_bh(&target->tx_lock); 869 870 endpoint->tx_proc_cnt++; 871 if (endpoint->tx_proc_cnt > 1) { 872 endpoint->tx_proc_cnt--; 873 spin_unlock_bh(&target->tx_lock); 874 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx busy\n"); 875 return; 876 } 877 878 /* 879 * drain the endpoint TX queue for transmission as long 880 * as we have enough credits. 881 */ 882 INIT_LIST_HEAD(&txq); 883 884 if ((HTC_CTRL_RSVD_SVC != endpoint->svc_id) && 885 (WMI_CONTROL_SVC != endpoint->svc_id)) 886 ac = target->dev->ar->ep2ac_map[endpoint->eid]; 887 888 while (true) { 889 if (list_empty(&endpoint->txq)) 890 break; 891 892 ath6kl_htc_tx_pkts_get(target, endpoint, &txq); 893 894 if (list_empty(&txq)) 895 break; 896 897 spin_unlock_bh(&target->tx_lock); 898 899 bundle_sent = 0; 900 n_pkts_bundle = 0; 901 902 while (true) { 903 /* try to send a bundle on each pass */ 904 if ((target->tx_bndl_mask) && 905 (get_queue_depth(&txq) >= 906 HTC_MIN_HTC_MSGS_TO_BUNDLE)) { 907 int temp1 = 0, temp2 = 0; 908 909 /* check if bundling is enabled for an AC */ 910 if (target->tx_bndl_mask & (1 << ac)) { 911 ath6kl_htc_tx_bundle(endpoint, &txq, 912 &temp1, &temp2); 913 bundle_sent += temp1; 914 n_pkts_bundle += temp2; 915 } 916 } 917 918 if (list_empty(&txq)) 919 break; 920 921 packet = list_first_entry(&txq, struct htc_packet, 922 list); 923 list_del(&packet->list); 924 925 ath6kl_htc_tx_prep_pkt(packet, packet->info.tx.flags, 926 0, packet->info.tx.seqno); 927 status = ath6kl_htc_tx_issue(target, packet); 928 929 if (status) { 930 packet->status = status; 931 packet->completion(packet->context, packet); 932 } 933 } 934 935 spin_lock_bh(&target->tx_lock); 936 937 endpoint->ep_st.tx_bundles += bundle_sent; 938 endpoint->ep_st.tx_pkt_bundled += n_pkts_bundle; 939 940 /* 941 * if an AC has bundling disabled and no tx bundling 942 * has occured continously for a certain number of TX, 943 * enable tx bundling for this AC 944 */ 945 if (!bundle_sent) { 946 if (!(target->tx_bndl_mask & (1 << ac)) && 947 (ac < WMM_NUM_AC)) { 948 if (++target->ac_tx_count[ac] >= 949 TX_RESUME_BUNDLE_THRESHOLD) { 950 target->ac_tx_count[ac] = 0; 951 target->tx_bndl_mask |= (1 << ac); 952 } 953 } 954 } else { 955 /* tx bundling will reset the counter */ 956 if (ac < WMM_NUM_AC) 957 target->ac_tx_count[ac] = 0; 958 } 959 } 960 961 endpoint->tx_proc_cnt = 0; 962 spin_unlock_bh(&target->tx_lock); 963} 964 965static bool ath6kl_htc_tx_try(struct htc_target *target, 966 struct htc_endpoint *endpoint, 967 struct htc_packet *tx_pkt) 968{ 969 struct htc_ep_callbacks ep_cb; 970 int txq_depth; 971 bool overflow = false; 972 973 ep_cb = endpoint->ep_cb; 974 975 spin_lock_bh(&target->tx_lock); 976 txq_depth = get_queue_depth(&endpoint->txq); 977 spin_unlock_bh(&target->tx_lock); 978 979 if (txq_depth >= endpoint->max_txq_depth) 980 overflow = true; 981 982 if (overflow) 983 ath6kl_dbg(ATH6KL_DBG_HTC, 984 "htc tx overflow ep %d depth %d max %d\n", 985 endpoint->eid, txq_depth, 986 endpoint->max_txq_depth); 987 988 if (overflow && ep_cb.tx_full) { 989 if (ep_cb.tx_full(endpoint->target, tx_pkt) == 990 HTC_SEND_FULL_DROP) { 991 endpoint->ep_st.tx_dropped += 1; 992 return false; 993 } 994 } 995 996 spin_lock_bh(&target->tx_lock); 997 list_add_tail(&tx_pkt->list, &endpoint->txq); 998 spin_unlock_bh(&target->tx_lock); 999 1000 ath6kl_htc_tx_from_queue(target, endpoint); 1001 1002 return true; 1003} 1004 1005static void htc_chk_ep_txq(struct htc_target *target) 1006{ 1007 struct htc_endpoint *endpoint; 1008 struct htc_endpoint_credit_dist *cred_dist; 1009 1010 /* 1011 * Run through the credit distribution list to see if there are 1012 * packets queued. NOTE: no locks need to be taken since the 1013 * distribution list is not dynamic (cannot be re-ordered) and we 1014 * are not modifying any state. 1015 */ 1016 list_for_each_entry(cred_dist, &target->cred_dist_list, list) { 1017 endpoint = cred_dist->htc_ep; 1018 1019 spin_lock_bh(&target->tx_lock); 1020 if (!list_empty(&endpoint->txq)) { 1021 ath6kl_dbg(ATH6KL_DBG_HTC, 1022 "htc creds ep %d credits %d pkts %d\n", 1023 cred_dist->endpoint, 1024 endpoint->cred_dist.credits, 1025 get_queue_depth(&endpoint->txq)); 1026 spin_unlock_bh(&target->tx_lock); 1027 /* 1028 * Try to start the stalled queue, this list is 1029 * ordered by priority. If there are credits 1030 * available the highest priority queue will get a 1031 * chance to reclaim credits from lower priority 1032 * ones. 1033 */ 1034 ath6kl_htc_tx_from_queue(target, endpoint); 1035 spin_lock_bh(&target->tx_lock); 1036 } 1037 spin_unlock_bh(&target->tx_lock); 1038 } 1039} 1040 1041static int htc_setup_tx_complete(struct htc_target *target) 1042{ 1043 struct htc_packet *send_pkt = NULL; 1044 int status; 1045 1046 send_pkt = htc_get_control_buf(target, true); 1047 1048 if (!send_pkt) 1049 return -ENOMEM; 1050 1051 if (target->htc_tgt_ver >= HTC_VERSION_2P1) { 1052 struct htc_setup_comp_ext_msg *setup_comp_ext; 1053 u32 flags = 0; 1054 1055 setup_comp_ext = 1056 (struct htc_setup_comp_ext_msg *)send_pkt->buf; 1057 memset(setup_comp_ext, 0, sizeof(*setup_comp_ext)); 1058 setup_comp_ext->msg_id = 1059 cpu_to_le16(HTC_MSG_SETUP_COMPLETE_EX_ID); 1060 1061 if (target->msg_per_bndl_max > 0) { 1062 /* Indicate HTC bundling to the target */ 1063 flags |= HTC_SETUP_COMP_FLG_RX_BNDL_EN; 1064 setup_comp_ext->msg_per_rxbndl = 1065 target->msg_per_bndl_max; 1066 } 1067 1068 memcpy(&setup_comp_ext->flags, &flags, 1069 sizeof(setup_comp_ext->flags)); 1070 set_htc_pkt_info(send_pkt, NULL, (u8 *) setup_comp_ext, 1071 sizeof(struct htc_setup_comp_ext_msg), 1072 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG); 1073 1074 } else { 1075 struct htc_setup_comp_msg *setup_comp; 1076 setup_comp = (struct htc_setup_comp_msg *)send_pkt->buf; 1077 memset(setup_comp, 0, sizeof(struct htc_setup_comp_msg)); 1078 setup_comp->msg_id = cpu_to_le16(HTC_MSG_SETUP_COMPLETE_ID); 1079 set_htc_pkt_info(send_pkt, NULL, (u8 *) setup_comp, 1080 sizeof(struct htc_setup_comp_msg), 1081 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG); 1082 } 1083 1084 /* we want synchronous operation */ 1085 send_pkt->completion = NULL; 1086 ath6kl_htc_tx_prep_pkt(send_pkt, 0, 0, 0); 1087 status = ath6kl_htc_tx_issue(target, send_pkt); 1088 htc_reclaim_txctrl_buf(target, send_pkt); 1089 1090 return status; 1091} 1092 1093static void ath6kl_htc_set_credit_dist(struct htc_target *target, 1094 struct ath6kl_htc_credit_info *credit_info, 1095 u16 srvc_pri_order[], int list_len) 1096{ 1097 struct htc_endpoint *endpoint; 1098 int i, ep; 1099 1100 target->credit_info = credit_info; 1101 1102 list_add_tail(&target->endpoint[ENDPOINT_0].cred_dist.list, 1103 &target->cred_dist_list); 1104 1105 for (i = 0; i < list_len; i++) { 1106 for (ep = ENDPOINT_1; ep < ENDPOINT_MAX; ep++) { 1107 endpoint = &target->endpoint[ep]; 1108 if (endpoint->svc_id == srvc_pri_order[i]) { 1109 list_add_tail(&endpoint->cred_dist.list, 1110 &target->cred_dist_list); 1111 break; 1112 } 1113 } 1114 if (ep >= ENDPOINT_MAX) { 1115 WARN_ON(1); 1116 return; 1117 } 1118 } 1119} 1120 1121static int ath6kl_htc_mbox_tx(struct htc_target *target, 1122 struct htc_packet *packet) 1123{ 1124 struct htc_endpoint *endpoint; 1125 struct list_head queue; 1126 1127 ath6kl_dbg(ATH6KL_DBG_HTC, 1128 "htc tx ep id %d buf 0x%p len %d\n", 1129 packet->endpoint, packet->buf, packet->act_len); 1130 1131 if (packet->endpoint >= ENDPOINT_MAX) { 1132 WARN_ON(1); 1133 return -EINVAL; 1134 } 1135 1136 endpoint = &target->endpoint[packet->endpoint]; 1137 1138 if (!ath6kl_htc_tx_try(target, endpoint, packet)) { 1139 packet->status = (target->htc_flags & HTC_OP_STATE_STOPPING) ? 1140 -ECANCELED : -ENOSPC; 1141 INIT_LIST_HEAD(&queue); 1142 list_add(&packet->list, &queue); 1143 htc_tx_complete(endpoint, &queue); 1144 } 1145 1146 return 0; 1147} 1148 1149/* flush endpoint TX queue */ 1150static void ath6kl_htc_mbox_flush_txep(struct htc_target *target, 1151 enum htc_endpoint_id eid, u16 tag) 1152{ 1153 struct htc_packet *packet, *tmp_pkt; 1154 struct list_head discard_q, container; 1155 struct htc_endpoint *endpoint = &target->endpoint[eid]; 1156 1157 if (!endpoint->svc_id) { 1158 WARN_ON(1); 1159 return; 1160 } 1161 1162 /* initialize the discard queue */ 1163 INIT_LIST_HEAD(&discard_q); 1164 1165 spin_lock_bh(&target->tx_lock); 1166 1167 list_for_each_entry_safe(packet, tmp_pkt, &endpoint->txq, list) { 1168 if ((tag == HTC_TX_PACKET_TAG_ALL) || 1169 (tag == packet->info.tx.tag)) 1170 list_move_tail(&packet->list, &discard_q); 1171 } 1172 1173 spin_unlock_bh(&target->tx_lock); 1174 1175 list_for_each_entry_safe(packet, tmp_pkt, &discard_q, list) { 1176 packet->status = -ECANCELED; 1177 list_del(&packet->list); 1178 ath6kl_dbg(ATH6KL_DBG_HTC, 1179 "htc tx flushing pkt 0x%p len %d ep %d tag 0x%x\n", 1180 packet, packet->act_len, 1181 packet->endpoint, packet->info.tx.tag); 1182 1183 INIT_LIST_HEAD(&container); 1184 list_add_tail(&packet->list, &container); 1185 htc_tx_complete(endpoint, &container); 1186 } 1187} 1188 1189static void ath6kl_htc_flush_txep_all(struct htc_target *target) 1190{ 1191 struct htc_endpoint *endpoint; 1192 int i; 1193 1194 dump_cred_dist_stats(target); 1195 1196 for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) { 1197 endpoint = &target->endpoint[i]; 1198 if (endpoint->svc_id == 0) 1199 /* not in use.. */ 1200 continue; 1201 ath6kl_htc_mbox_flush_txep(target, i, HTC_TX_PACKET_TAG_ALL); 1202 } 1203} 1204 1205static void ath6kl_htc_mbox_activity_changed(struct htc_target *target, 1206 enum htc_endpoint_id eid, 1207 bool active) 1208{ 1209 struct htc_endpoint *endpoint = &target->endpoint[eid]; 1210 bool dist = false; 1211 1212 if (endpoint->svc_id == 0) { 1213 WARN_ON(1); 1214 return; 1215 } 1216 1217 spin_lock_bh(&target->tx_lock); 1218 1219 if (active) { 1220 if (!(endpoint->cred_dist.dist_flags & HTC_EP_ACTIVE)) { 1221 endpoint->cred_dist.dist_flags |= HTC_EP_ACTIVE; 1222 dist = true; 1223 } 1224 } else { 1225 if (endpoint->cred_dist.dist_flags & HTC_EP_ACTIVE) { 1226 endpoint->cred_dist.dist_flags &= ~HTC_EP_ACTIVE; 1227 dist = true; 1228 } 1229 } 1230 1231 if (dist) { 1232 endpoint->cred_dist.txq_depth = 1233 get_queue_depth(&endpoint->txq); 1234 1235 ath6kl_dbg(ATH6KL_DBG_HTC, 1236 "htc tx activity ctxt 0x%p dist 0x%p\n", 1237 target->credit_info, &target->cred_dist_list); 1238 1239 ath6kl_credit_distribute(target->credit_info, 1240 &target->cred_dist_list, 1241 HTC_CREDIT_DIST_ACTIVITY_CHANGE); 1242 } 1243 1244 spin_unlock_bh(&target->tx_lock); 1245 1246 if (dist && !active) 1247 htc_chk_ep_txq(target); 1248} 1249 1250/* HTC Rx */ 1251 1252static inline void ath6kl_htc_rx_update_stats(struct htc_endpoint *endpoint, 1253 int n_look_ahds) 1254{ 1255 endpoint->ep_st.rx_pkts++; 1256 if (n_look_ahds == 1) 1257 endpoint->ep_st.rx_lkahds++; 1258 else if (n_look_ahds > 1) 1259 endpoint->ep_st.rx_bundle_lkahd++; 1260} 1261 1262static inline bool htc_valid_rx_frame_len(struct htc_target *target, 1263 enum htc_endpoint_id eid, int len) 1264{ 1265 return (eid == target->dev->ar->ctrl_ep) ? 1266 len <= ATH6KL_BUFFER_SIZE : len <= ATH6KL_AMSDU_BUFFER_SIZE; 1267} 1268 1269static int htc_add_rxbuf(struct htc_target *target, struct htc_packet *packet) 1270{ 1271 struct list_head queue; 1272 1273 INIT_LIST_HEAD(&queue); 1274 list_add_tail(&packet->list, &queue); 1275 return ath6kl_htc_mbox_add_rxbuf_multiple(target, &queue); 1276} 1277 1278static void htc_reclaim_rxbuf(struct htc_target *target, 1279 struct htc_packet *packet, 1280 struct htc_endpoint *ep) 1281{ 1282 if (packet->info.rx.rx_flags & HTC_RX_PKT_NO_RECYCLE) { 1283 htc_rxpkt_reset(packet); 1284 packet->status = -ECANCELED; 1285 ep->ep_cb.rx(ep->target, packet); 1286 } else { 1287 htc_rxpkt_reset(packet); 1288 htc_add_rxbuf((void *)(target), packet); 1289 } 1290} 1291 1292static void reclaim_rx_ctrl_buf(struct htc_target *target, 1293 struct htc_packet *packet) 1294{ 1295 spin_lock_bh(&target->htc_lock); 1296 list_add_tail(&packet->list, &target->free_ctrl_rxbuf); 1297 spin_unlock_bh(&target->htc_lock); 1298} 1299 1300static int ath6kl_htc_rx_packet(struct htc_target *target, 1301 struct htc_packet *packet, 1302 u32 rx_len) 1303{ 1304 struct ath6kl_device *dev = target->dev; 1305 u32 padded_len; 1306 int status; 1307 1308 padded_len = CALC_TXRX_PADDED_LEN(target, rx_len); 1309 1310 if (padded_len > packet->buf_len) { 1311 ath6kl_err("not enough receive space for packet - padlen %d recvlen %d bufferlen %d\n", 1312 padded_len, rx_len, packet->buf_len); 1313 return -ENOMEM; 1314 } 1315 1316 ath6kl_dbg(ATH6KL_DBG_HTC, 1317 "htc rx 0x%p hdr 0x%x len %d mbox 0x%x\n", 1318 packet, packet->info.rx.exp_hdr, 1319 padded_len, dev->ar->mbox_info.htc_addr); 1320 1321 status = hif_read_write_sync(dev->ar, 1322 dev->ar->mbox_info.htc_addr, 1323 packet->buf, padded_len, 1324 HIF_RD_SYNC_BLOCK_FIX); 1325 1326 packet->status = status; 1327 1328 return status; 1329} 1330 1331/* 1332 * optimization for recv packets, we can indicate a 1333 * "hint" that there are more single-packets to fetch 1334 * on this endpoint. 1335 */ 1336static void ath6kl_htc_rx_set_indicate(u32 lk_ahd, 1337 struct htc_endpoint *endpoint, 1338 struct htc_packet *packet) 1339{ 1340 struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)&lk_ahd; 1341 1342 if (htc_hdr->eid == packet->endpoint) { 1343 if (!list_empty(&endpoint->rx_bufq)) 1344 packet->info.rx.indicat_flags |= 1345 HTC_RX_FLAGS_INDICATE_MORE_PKTS; 1346 } 1347} 1348 1349static void ath6kl_htc_rx_chk_water_mark(struct htc_endpoint *endpoint) 1350{ 1351 struct htc_ep_callbacks ep_cb = endpoint->ep_cb; 1352 1353 if (ep_cb.rx_refill_thresh > 0) { 1354 spin_lock_bh(&endpoint->target->rx_lock); 1355 if (get_queue_depth(&endpoint->rx_bufq) 1356 < ep_cb.rx_refill_thresh) { 1357 spin_unlock_bh(&endpoint->target->rx_lock); 1358 ep_cb.rx_refill(endpoint->target, endpoint->eid); 1359 return; 1360 } 1361 spin_unlock_bh(&endpoint->target->rx_lock); 1362 } 1363} 1364 1365/* This function is called with rx_lock held */ 1366static int ath6kl_htc_rx_setup(struct htc_target *target, 1367 struct htc_endpoint *ep, 1368 u32 *lk_ahds, struct list_head *queue, int n_msg) 1369{ 1370 struct htc_packet *packet; 1371 /* FIXME: type of lk_ahds can't be right */ 1372 struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)lk_ahds; 1373 struct htc_ep_callbacks ep_cb; 1374 int status = 0, j, full_len; 1375 bool no_recycle; 1376 1377 full_len = CALC_TXRX_PADDED_LEN(target, 1378 le16_to_cpu(htc_hdr->payld_len) + 1379 sizeof(*htc_hdr)); 1380 1381 if (!htc_valid_rx_frame_len(target, ep->eid, full_len)) { 1382 ath6kl_warn("Rx buffer requested with invalid length htc_hdr:eid %d, flags 0x%x, len %d\n", 1383 htc_hdr->eid, htc_hdr->flags, 1384 le16_to_cpu(htc_hdr->payld_len)); 1385 return -EINVAL; 1386 } 1387 1388 ep_cb = ep->ep_cb; 1389 for (j = 0; j < n_msg; j++) { 1390 /* 1391 * Reset flag, any packets allocated using the 1392 * rx_alloc() API cannot be recycled on 1393 * cleanup,they must be explicitly returned. 1394 */ 1395 no_recycle = false; 1396 1397 if (ep_cb.rx_allocthresh && 1398 (full_len > ep_cb.rx_alloc_thresh)) { 1399 ep->ep_st.rx_alloc_thresh_hit += 1; 1400 ep->ep_st.rxalloc_thresh_byte += 1401 le16_to_cpu(htc_hdr->payld_len); 1402 1403 spin_unlock_bh(&target->rx_lock); 1404 no_recycle = true; 1405 1406 packet = ep_cb.rx_allocthresh(ep->target, ep->eid, 1407 full_len); 1408 spin_lock_bh(&target->rx_lock); 1409 } else { 1410 /* refill handler is being used */ 1411 if (list_empty(&ep->rx_bufq)) { 1412 if (ep_cb.rx_refill) { 1413 spin_unlock_bh(&target->rx_lock); 1414 ep_cb.rx_refill(ep->target, ep->eid); 1415 spin_lock_bh(&target->rx_lock); 1416 } 1417 } 1418 1419 if (list_empty(&ep->rx_bufq)) { 1420 packet = NULL; 1421 } else { 1422 packet = list_first_entry(&ep->rx_bufq, 1423 struct htc_packet, list); 1424 list_del(&packet->list); 1425 } 1426 } 1427 1428 if (!packet) { 1429 target->rx_st_flags |= HTC_RECV_WAIT_BUFFERS; 1430 target->ep_waiting = ep->eid; 1431 return -ENOSPC; 1432 } 1433 1434 /* clear flags */ 1435 packet->info.rx.rx_flags = 0; 1436 packet->info.rx.indicat_flags = 0; 1437 packet->status = 0; 1438 1439 if (no_recycle) 1440 /* 1441 * flag that these packets cannot be 1442 * recycled, they have to be returned to 1443 * the user 1444 */ 1445 packet->info.rx.rx_flags |= HTC_RX_PKT_NO_RECYCLE; 1446 1447 /* Caller needs to free this upon any failure */ 1448 list_add_tail(&packet->list, queue); 1449 1450 if (target->htc_flags & HTC_OP_STATE_STOPPING) { 1451 status = -ECANCELED; 1452 break; 1453 } 1454 1455 if (j) { 1456 packet->info.rx.rx_flags |= HTC_RX_PKT_REFRESH_HDR; 1457 packet->info.rx.exp_hdr = 0xFFFFFFFF; 1458 } else 1459 /* set expected look ahead */ 1460 packet->info.rx.exp_hdr = *lk_ahds; 1461 1462 packet->act_len = le16_to_cpu(htc_hdr->payld_len) + 1463 HTC_HDR_LENGTH; 1464 } 1465 1466 return status; 1467} 1468 1469static int ath6kl_htc_rx_alloc(struct htc_target *target, 1470 u32 lk_ahds[], int msg, 1471 struct htc_endpoint *endpoint, 1472 struct list_head *queue) 1473{ 1474 int status = 0; 1475 struct htc_packet *packet, *tmp_pkt; 1476 struct htc_frame_hdr *htc_hdr; 1477 int i, n_msg; 1478 1479 spin_lock_bh(&target->rx_lock); 1480 1481 for (i = 0; i < msg; i++) { 1482 htc_hdr = (struct htc_frame_hdr *)&lk_ahds[i]; 1483 1484 if (htc_hdr->eid >= ENDPOINT_MAX) { 1485 ath6kl_err("invalid ep in look-ahead: %d\n", 1486 htc_hdr->eid); 1487 status = -ENOMEM; 1488 break; 1489 } 1490 1491 if (htc_hdr->eid != endpoint->eid) { 1492 ath6kl_err("invalid ep in look-ahead: %d should be : %d (index:%d)\n", 1493 htc_hdr->eid, endpoint->eid, i); 1494 status = -ENOMEM; 1495 break; 1496 } 1497 1498 if (le16_to_cpu(htc_hdr->payld_len) > HTC_MAX_PAYLOAD_LENGTH) { 1499 ath6kl_err("payload len %d exceeds max htc : %d !\n", 1500 htc_hdr->payld_len, 1501 (u32) HTC_MAX_PAYLOAD_LENGTH); 1502 status = -ENOMEM; 1503 break; 1504 } 1505 1506 if (endpoint->svc_id == 0) { 1507 ath6kl_err("ep %d is not connected !\n", htc_hdr->eid); 1508 status = -ENOMEM; 1509 break; 1510 } 1511 1512 if (htc_hdr->flags & HTC_FLG_RX_BNDL_CNT) { 1513 /* 1514 * HTC header indicates that every packet to follow 1515 * has the same padded length so that it can be 1516 * optimally fetched as a full bundle. 1517 */ 1518 n_msg = (htc_hdr->flags & HTC_FLG_RX_BNDL_CNT) >> 1519 HTC_FLG_RX_BNDL_CNT_S; 1520 1521 /* the count doesn't include the starter frame */ 1522 n_msg++; 1523 if (n_msg > target->msg_per_bndl_max) { 1524 status = -ENOMEM; 1525 break; 1526 } 1527 1528 endpoint->ep_st.rx_bundle_from_hdr += 1; 1529 ath6kl_dbg(ATH6KL_DBG_HTC, 1530 "htc rx bundle pkts %d\n", 1531 n_msg); 1532 } else 1533 /* HTC header only indicates 1 message to fetch */ 1534 n_msg = 1; 1535 1536 /* Setup packet buffers for each message */ 1537 status = ath6kl_htc_rx_setup(target, endpoint, &lk_ahds[i], 1538 queue, n_msg); 1539 1540 /* 1541 * This is due to unavailability of buffers to rx entire data. 1542 * Return no error so that free buffers from queue can be used 1543 * to receive partial data. 1544 */ 1545 if (status == -ENOSPC) { 1546 spin_unlock_bh(&target->rx_lock); 1547 return 0; 1548 } 1549 1550 if (status) 1551 break; 1552 } 1553 1554 spin_unlock_bh(&target->rx_lock); 1555 1556 if (status) { 1557 list_for_each_entry_safe(packet, tmp_pkt, queue, list) { 1558 list_del(&packet->list); 1559 htc_reclaim_rxbuf(target, packet, 1560 &target->endpoint[packet->endpoint]); 1561 } 1562 } 1563 1564 return status; 1565} 1566 1567static void htc_ctrl_rx(struct htc_target *context, struct htc_packet *packets) 1568{ 1569 if (packets->endpoint != ENDPOINT_0) { 1570 WARN_ON(1); 1571 return; 1572 } 1573 1574 if (packets->status == -ECANCELED) { 1575 reclaim_rx_ctrl_buf(context, packets); 1576 return; 1577 } 1578 1579 if (packets->act_len > 0) { 1580 ath6kl_err("htc_ctrl_rx, got message with len:%zu\n", 1581 packets->act_len + HTC_HDR_LENGTH); 1582 1583 ath6kl_dbg_dump(ATH6KL_DBG_HTC, 1584 "htc rx unexpected endpoint 0 message", "", 1585 packets->buf - HTC_HDR_LENGTH, 1586 packets->act_len + HTC_HDR_LENGTH); 1587 } 1588 1589 htc_reclaim_rxbuf(context, packets, &context->endpoint[0]); 1590} 1591 1592static void htc_proc_cred_rpt(struct htc_target *target, 1593 struct htc_credit_report *rpt, 1594 int n_entries, 1595 enum htc_endpoint_id from_ep) 1596{ 1597 struct htc_endpoint *endpoint; 1598 int tot_credits = 0, i; 1599 bool dist = false; 1600 1601 spin_lock_bh(&target->tx_lock); 1602 1603 for (i = 0; i < n_entries; i++, rpt++) { 1604 if (rpt->eid >= ENDPOINT_MAX) { 1605 WARN_ON(1); 1606 spin_unlock_bh(&target->tx_lock); 1607 return; 1608 } 1609 1610 endpoint = &target->endpoint[rpt->eid]; 1611 1612 ath6kl_dbg(ATH6KL_DBG_CREDIT, 1613 "credit report ep %d credits %d\n", 1614 rpt->eid, rpt->credits); 1615 1616 endpoint->ep_st.tx_cred_rpt += 1; 1617 endpoint->ep_st.cred_retnd += rpt->credits; 1618 1619 if (from_ep == rpt->eid) { 1620 /* 1621 * This credit report arrived on the same endpoint 1622 * indicating it arrived in an RX packet. 1623 */ 1624 endpoint->ep_st.cred_from_rx += rpt->credits; 1625 endpoint->ep_st.cred_rpt_from_rx += 1; 1626 } else if (from_ep == ENDPOINT_0) { 1627 /* credit arrived on endpoint 0 as a NULL message */ 1628 endpoint->ep_st.cred_from_ep0 += rpt->credits; 1629 endpoint->ep_st.cred_rpt_ep0 += 1; 1630 } else { 1631 endpoint->ep_st.cred_from_other += rpt->credits; 1632 endpoint->ep_st.cred_rpt_from_other += 1; 1633 } 1634 1635 if (rpt->eid == ENDPOINT_0) 1636 /* always give endpoint 0 credits back */ 1637 endpoint->cred_dist.credits += rpt->credits; 1638 else { 1639 endpoint->cred_dist.cred_to_dist += rpt->credits; 1640 dist = true; 1641 } 1642 1643 /* 1644 * Refresh tx depth for distribution function that will 1645 * recover these credits NOTE: this is only valid when 1646 * there are credits to recover! 1647 */ 1648 endpoint->cred_dist.txq_depth = 1649 get_queue_depth(&endpoint->txq); 1650 1651 tot_credits += rpt->credits; 1652 } 1653 1654 if (dist) { 1655 /* 1656 * This was a credit return based on a completed send 1657 * operations note, this is done with the lock held 1658 */ 1659 ath6kl_credit_distribute(target->credit_info, 1660 &target->cred_dist_list, 1661 HTC_CREDIT_DIST_SEND_COMPLETE); 1662 } 1663 1664 spin_unlock_bh(&target->tx_lock); 1665 1666 if (tot_credits) 1667 htc_chk_ep_txq(target); 1668} 1669 1670static int htc_parse_trailer(struct htc_target *target, 1671 struct htc_record_hdr *record, 1672 u8 *record_buf, u32 *next_lk_ahds, 1673 enum htc_endpoint_id endpoint, 1674 int *n_lk_ahds) 1675{ 1676 struct htc_bundle_lkahd_rpt *bundle_lkahd_rpt; 1677 struct htc_lookahead_report *lk_ahd; 1678 int len; 1679 1680 switch (record->rec_id) { 1681 case HTC_RECORD_CREDITS: 1682 len = record->len / sizeof(struct htc_credit_report); 1683 if (!len) { 1684 WARN_ON(1); 1685 return -EINVAL; 1686 } 1687 1688 htc_proc_cred_rpt(target, 1689 (struct htc_credit_report *) record_buf, 1690 len, endpoint); 1691 break; 1692 case HTC_RECORD_LOOKAHEAD: 1693 len = record->len / sizeof(*lk_ahd); 1694 if (!len) { 1695 WARN_ON(1); 1696 return -EINVAL; 1697 } 1698 1699 lk_ahd = (struct htc_lookahead_report *) record_buf; 1700 if ((lk_ahd->pre_valid == ((~lk_ahd->post_valid) & 0xFF)) && 1701 next_lk_ahds) { 1702 ath6kl_dbg(ATH6KL_DBG_HTC, 1703 "htc rx lk_ahd found pre_valid 0x%x post_valid 0x%x\n", 1704 lk_ahd->pre_valid, lk_ahd->post_valid); 1705 1706 /* look ahead bytes are valid, copy them over */ 1707 memcpy((u8 *)&next_lk_ahds[0], lk_ahd->lk_ahd, 4); 1708 1709 ath6kl_dbg_dump(ATH6KL_DBG_HTC, 1710 "htc rx next look ahead", 1711 "", next_lk_ahds, 4); 1712 1713 *n_lk_ahds = 1; 1714 } 1715 break; 1716 case HTC_RECORD_LOOKAHEAD_BUNDLE: 1717 len = record->len / sizeof(*bundle_lkahd_rpt); 1718 if (!len || (len > HTC_HOST_MAX_MSG_PER_BUNDLE)) { 1719 WARN_ON(1); 1720 return -EINVAL; 1721 } 1722 1723 if (next_lk_ahds) { 1724 int i; 1725 1726 bundle_lkahd_rpt = 1727 (struct htc_bundle_lkahd_rpt *) record_buf; 1728 1729 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bundle lk_ahd", 1730 "", record_buf, record->len); 1731 1732 for (i = 0; i < len; i++) { 1733 memcpy((u8 *)&next_lk_ahds[i], 1734 bundle_lkahd_rpt->lk_ahd, 4); 1735 bundle_lkahd_rpt++; 1736 } 1737 1738 *n_lk_ahds = i; 1739 } 1740 break; 1741 default: 1742 ath6kl_err("unhandled record: id:%d len:%d\n", 1743 record->rec_id, record->len); 1744 break; 1745 } 1746 1747 return 0; 1748} 1749 1750static int htc_proc_trailer(struct htc_target *target, 1751 u8 *buf, int len, u32 *next_lk_ahds, 1752 int *n_lk_ahds, enum htc_endpoint_id endpoint) 1753{ 1754 struct htc_record_hdr *record; 1755 int orig_len; 1756 int status; 1757 u8 *record_buf; 1758 u8 *orig_buf; 1759 1760 ath6kl_dbg(ATH6KL_DBG_HTC, "htc rx trailer len %d\n", len); 1761 ath6kl_dbg_dump(ATH6KL_DBG_HTC, NULL, "", buf, len); 1762 1763 orig_buf = buf; 1764 orig_len = len; 1765 status = 0; 1766 1767 while (len > 0) { 1768 if (len < sizeof(struct htc_record_hdr)) { 1769 status = -ENOMEM; 1770 break; 1771 } 1772 /* these are byte aligned structs */ 1773 record = (struct htc_record_hdr *) buf; 1774 len -= sizeof(struct htc_record_hdr); 1775 buf += sizeof(struct htc_record_hdr); 1776 1777 if (record->len > len) { 1778 ath6kl_err("invalid record len: %d (id:%d) buf has: %d bytes left\n", 1779 record->len, record->rec_id, len); 1780 status = -ENOMEM; 1781 break; 1782 } 1783 record_buf = buf; 1784 1785 status = htc_parse_trailer(target, record, record_buf, 1786 next_lk_ahds, endpoint, n_lk_ahds); 1787 1788 if (status) 1789 break; 1790 1791 /* advance buffer past this record for next time around */ 1792 buf += record->len; 1793 len -= record->len; 1794 } 1795 1796 if (status) 1797 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bad trailer", 1798 "", orig_buf, orig_len); 1799 1800 return status; 1801} 1802 1803static int ath6kl_htc_rx_process_hdr(struct htc_target *target, 1804 struct htc_packet *packet, 1805 u32 *next_lkahds, int *n_lkahds) 1806{ 1807 int status = 0; 1808 u16 payload_len; 1809 u32 lk_ahd; 1810 struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)packet->buf; 1811 1812 if (n_lkahds != NULL) 1813 *n_lkahds = 0; 1814 1815 /* 1816 * NOTE: we cannot assume the alignment of buf, so we use the safe 1817 * macros to retrieve 16 bit fields. 1818 */ 1819 payload_len = le16_to_cpu(get_unaligned(&htc_hdr->payld_len)); 1820 1821 memcpy((u8 *)&lk_ahd, packet->buf, sizeof(lk_ahd)); 1822 1823 if (packet->info.rx.rx_flags & HTC_RX_PKT_REFRESH_HDR) { 1824 /* 1825 * Refresh the expected header and the actual length as it 1826 * was unknown when this packet was grabbed as part of the 1827 * bundle. 1828 */ 1829 packet->info.rx.exp_hdr = lk_ahd; 1830 packet->act_len = payload_len + HTC_HDR_LENGTH; 1831 1832 /* validate the actual header that was refreshed */ 1833 if (packet->act_len > packet->buf_len) { 1834 ath6kl_err("refreshed hdr payload len (%d) in bundled recv is invalid (hdr: 0x%X)\n", 1835 payload_len, lk_ahd); 1836 /* 1837 * Limit this to max buffer just to print out some 1838 * of the buffer. 1839 */ 1840 packet->act_len = min(packet->act_len, packet->buf_len); 1841 status = -ENOMEM; 1842 goto fail_rx; 1843 } 1844 1845 if (packet->endpoint != htc_hdr->eid) { 1846 ath6kl_err("refreshed hdr ep (%d) does not match expected ep (%d)\n", 1847 htc_hdr->eid, packet->endpoint); 1848 status = -ENOMEM; 1849 goto fail_rx; 1850 } 1851 } 1852 1853 if (lk_ahd != packet->info.rx.exp_hdr) { 1854 ath6kl_err("%s(): lk_ahd mismatch! (pPkt:0x%p flags:0x%X)\n", 1855 __func__, packet, packet->info.rx.rx_flags); 1856 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx expected lk_ahd", 1857 "", &packet->info.rx.exp_hdr, 4); 1858 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx current header", 1859 "", (u8 *)&lk_ahd, sizeof(lk_ahd)); 1860 status = -ENOMEM; 1861 goto fail_rx; 1862 } 1863 1864 if (htc_hdr->flags & HTC_FLG_RX_TRAILER) { 1865 if (htc_hdr->ctrl[0] < sizeof(struct htc_record_hdr) || 1866 htc_hdr->ctrl[0] > payload_len) { 1867 ath6kl_err("%s(): invalid hdr (payload len should be :%d, CB[0] is:%d)\n", 1868 __func__, payload_len, htc_hdr->ctrl[0]); 1869 status = -ENOMEM; 1870 goto fail_rx; 1871 } 1872 1873 if (packet->info.rx.rx_flags & HTC_RX_PKT_IGNORE_LOOKAHEAD) { 1874 next_lkahds = NULL; 1875 n_lkahds = NULL; 1876 } 1877 1878 status = htc_proc_trailer(target, packet->buf + HTC_HDR_LENGTH 1879 + payload_len - htc_hdr->ctrl[0], 1880 htc_hdr->ctrl[0], next_lkahds, 1881 n_lkahds, packet->endpoint); 1882 1883 if (status) 1884 goto fail_rx; 1885 1886 packet->act_len -= htc_hdr->ctrl[0]; 1887 } 1888 1889 packet->buf += HTC_HDR_LENGTH; 1890 packet->act_len -= HTC_HDR_LENGTH; 1891 1892fail_rx: 1893 if (status) 1894 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bad packet", 1895 "", packet->buf, packet->act_len); 1896 1897 return status; 1898} 1899 1900static void ath6kl_htc_rx_complete(struct htc_endpoint *endpoint, 1901 struct htc_packet *packet) 1902{ 1903 ath6kl_dbg(ATH6KL_DBG_HTC, 1904 "htc rx complete ep %d packet 0x%p\n", 1905 endpoint->eid, packet); 1906 1907 endpoint->ep_cb.rx(endpoint->target, packet); 1908} 1909 1910static int ath6kl_htc_rx_bundle(struct htc_target *target, 1911 struct list_head *rxq, 1912 struct list_head *sync_compq, 1913 int *n_pkt_fetched, bool part_bundle) 1914{ 1915 struct hif_scatter_req *scat_req; 1916 struct htc_packet *packet; 1917 int rem_space = target->max_rx_bndl_sz; 1918 int n_scat_pkt, status = 0, i, len; 1919 1920 n_scat_pkt = get_queue_depth(rxq); 1921 n_scat_pkt = min(n_scat_pkt, target->msg_per_bndl_max); 1922 1923 if ((get_queue_depth(rxq) - n_scat_pkt) > 0) { 1924 /* 1925 * We were forced to split this bundle receive operation 1926 * all packets in this partial bundle must have their 1927 * lookaheads ignored. 1928 */ 1929 part_bundle = true; 1930 1931 /* 1932 * This would only happen if the target ignored our max 1933 * bundle limit. 1934 */ 1935 ath6kl_warn("%s(): partial bundle detected num:%d , %d\n", 1936 __func__, get_queue_depth(rxq), n_scat_pkt); 1937 } 1938 1939 len = 0; 1940 1941 ath6kl_dbg(ATH6KL_DBG_HTC, 1942 "htc rx bundle depth %d pkts %d\n", 1943 get_queue_depth(rxq), n_scat_pkt); 1944 1945 scat_req = hif_scatter_req_get(target->dev->ar); 1946 1947 if (scat_req == NULL) 1948 goto fail_rx_pkt; 1949 1950 for (i = 0; i < n_scat_pkt; i++) { 1951 int pad_len; 1952 1953 packet = list_first_entry(rxq, struct htc_packet, list); 1954 list_del(&packet->list); 1955 1956 pad_len = CALC_TXRX_PADDED_LEN(target, 1957 packet->act_len); 1958 1959 if ((rem_space - pad_len) < 0) { 1960 list_add(&packet->list, rxq); 1961 break; 1962 } 1963 1964 rem_space -= pad_len; 1965 1966 if (part_bundle || (i < (n_scat_pkt - 1))) 1967 /* 1968 * Packet 0..n-1 cannot be checked for look-aheads 1969 * since we are fetching a bundle the last packet 1970 * however can have it's lookahead used 1971 */ 1972 packet->info.rx.rx_flags |= 1973 HTC_RX_PKT_IGNORE_LOOKAHEAD; 1974 1975 /* NOTE: 1 HTC packet per scatter entry */ 1976 scat_req->scat_list[i].buf = packet->buf; 1977 scat_req->scat_list[i].len = pad_len; 1978 1979 packet->info.rx.rx_flags |= HTC_RX_PKT_PART_OF_BUNDLE; 1980 1981 list_add_tail(&packet->list, sync_compq); 1982 1983 WARN_ON(!scat_req->scat_list[i].len); 1984 len += scat_req->scat_list[i].len; 1985 } 1986 1987 scat_req->len = len; 1988 scat_req->scat_entries = i; 1989 1990 status = ath6kl_hif_submit_scat_req(target->dev, scat_req, true); 1991 1992 if (!status) 1993 *n_pkt_fetched = i; 1994 1995 /* free scatter request */ 1996 hif_scatter_req_add(target->dev->ar, scat_req); 1997 1998fail_rx_pkt: 1999 2000 return status; 2001} 2002 2003static int ath6kl_htc_rx_process_packets(struct htc_target *target, 2004 struct list_head *comp_pktq, 2005 u32 lk_ahds[], 2006 int *n_lk_ahd) 2007{ 2008 struct htc_packet *packet, *tmp_pkt; 2009 struct htc_endpoint *ep; 2010 int status = 0; 2011 2012 list_for_each_entry_safe(packet, tmp_pkt, comp_pktq, list) { 2013 ep = &target->endpoint[packet->endpoint]; 2014 2015 trace_ath6kl_htc_rx(packet->status, packet->endpoint, 2016 packet->buf, packet->act_len); 2017 2018 /* process header for each of the recv packet */ 2019 status = ath6kl_htc_rx_process_hdr(target, packet, lk_ahds, 2020 n_lk_ahd); 2021 if (status) 2022 return status; 2023 2024 list_del(&packet->list); 2025 2026 if (list_empty(comp_pktq)) { 2027 /* 2028 * Last packet's more packet flag is set 2029 * based on the lookahead. 2030 */ 2031 if (*n_lk_ahd > 0) 2032 ath6kl_htc_rx_set_indicate(lk_ahds[0], 2033 ep, packet); 2034 } else 2035 /* 2036 * Packets in a bundle automatically have 2037 * this flag set. 2038 */ 2039 packet->info.rx.indicat_flags |= 2040 HTC_RX_FLAGS_INDICATE_MORE_PKTS; 2041 2042 ath6kl_htc_rx_update_stats(ep, *n_lk_ahd); 2043 2044 if (packet->info.rx.rx_flags & HTC_RX_PKT_PART_OF_BUNDLE) 2045 ep->ep_st.rx_bundl += 1; 2046 2047 ath6kl_htc_rx_complete(ep, packet); 2048 } 2049 2050 return status; 2051} 2052 2053static int ath6kl_htc_rx_fetch(struct htc_target *target, 2054 struct list_head *rx_pktq, 2055 struct list_head *comp_pktq) 2056{ 2057 int fetched_pkts; 2058 bool part_bundle = false; 2059 int status = 0; 2060 struct list_head tmp_rxq; 2061 struct htc_packet *packet, *tmp_pkt; 2062 2063 /* now go fetch the list of HTC packets */ 2064 while (!list_empty(rx_pktq)) { 2065 fetched_pkts = 0; 2066 2067 INIT_LIST_HEAD(&tmp_rxq); 2068 2069 if (target->rx_bndl_enable && (get_queue_depth(rx_pktq) > 1)) { 2070 /* 2071 * There are enough packets to attempt a 2072 * bundle transfer and recv bundling is 2073 * allowed. 2074 */ 2075 status = ath6kl_htc_rx_bundle(target, rx_pktq, 2076 &tmp_rxq, 2077 &fetched_pkts, 2078 part_bundle); 2079 if (status) 2080 goto fail_rx; 2081 2082 if (!list_empty(rx_pktq)) 2083 part_bundle = true; 2084 2085 list_splice_tail_init(&tmp_rxq, comp_pktq); 2086 } 2087 2088 if (!fetched_pkts) { 2089 packet = list_first_entry(rx_pktq, struct htc_packet, 2090 list); 2091 2092 /* fully synchronous */ 2093 packet->completion = NULL; 2094 2095 if (!list_is_singular(rx_pktq)) 2096 /* 2097 * look_aheads in all packet 2098 * except the last one in the 2099 * bundle must be ignored 2100 */ 2101 packet->info.rx.rx_flags |= 2102 HTC_RX_PKT_IGNORE_LOOKAHEAD; 2103 2104 /* go fetch the packet */ 2105 status = ath6kl_htc_rx_packet(target, packet, 2106 packet->act_len); 2107 2108 list_move_tail(&packet->list, &tmp_rxq); 2109 2110 if (status) 2111 goto fail_rx; 2112 2113 list_splice_tail_init(&tmp_rxq, comp_pktq); 2114 } 2115 } 2116 2117 return 0; 2118 2119fail_rx: 2120 2121 /* 2122 * Cleanup any packets we allocated but didn't use to 2123 * actually fetch any packets. 2124 */ 2125 2126 list_for_each_entry_safe(packet, tmp_pkt, rx_pktq, list) { 2127 list_del(&packet->list); 2128 htc_reclaim_rxbuf(target, packet, 2129 &target->endpoint[packet->endpoint]); 2130 } 2131 2132 list_for_each_entry_safe(packet, tmp_pkt, &tmp_rxq, list) { 2133 list_del(&packet->list); 2134 htc_reclaim_rxbuf(target, packet, 2135 &target->endpoint[packet->endpoint]); 2136 } 2137 2138 return status; 2139} 2140 2141int ath6kl_htc_rxmsg_pending_handler(struct htc_target *target, 2142 u32 msg_look_ahead, int *num_pkts) 2143{ 2144 struct htc_packet *packets, *tmp_pkt; 2145 struct htc_endpoint *endpoint; 2146 struct list_head rx_pktq, comp_pktq; 2147 int status = 0; 2148 u32 look_aheads[HTC_HOST_MAX_MSG_PER_BUNDLE]; 2149 int num_look_ahead = 1; 2150 enum htc_endpoint_id id; 2151 int n_fetched = 0; 2152 2153 INIT_LIST_HEAD(&comp_pktq); 2154 *num_pkts = 0; 2155 2156 /* 2157 * On first entry copy the look_aheads into our temp array for 2158 * processing 2159 */ 2160 look_aheads[0] = msg_look_ahead; 2161 2162 while (true) { 2163 /* 2164 * First lookahead sets the expected endpoint IDs for all 2165 * packets in a bundle. 2166 */ 2167 id = ((struct htc_frame_hdr *)&look_aheads[0])->eid; 2168 endpoint = &target->endpoint[id]; 2169 2170 if (id >= ENDPOINT_MAX) { 2171 ath6kl_err("MsgPend, invalid endpoint in look-ahead: %d\n", 2172 id); 2173 status = -ENOMEM; 2174 break; 2175 } 2176 2177 INIT_LIST_HEAD(&rx_pktq); 2178 INIT_LIST_HEAD(&comp_pktq); 2179 2180 /* 2181 * Try to allocate as many HTC RX packets indicated by the 2182 * look_aheads. 2183 */ 2184 status = ath6kl_htc_rx_alloc(target, look_aheads, 2185 num_look_ahead, endpoint, 2186 &rx_pktq); 2187 if (status) 2188 break; 2189 2190 if (get_queue_depth(&rx_pktq) >= 2) 2191 /* 2192 * A recv bundle was detected, force IRQ status 2193 * re-check again 2194 */ 2195 target->chk_irq_status_cnt = 1; 2196 2197 n_fetched += get_queue_depth(&rx_pktq); 2198 2199 num_look_ahead = 0; 2200 2201 status = ath6kl_htc_rx_fetch(target, &rx_pktq, &comp_pktq); 2202 2203 if (!status) 2204 ath6kl_htc_rx_chk_water_mark(endpoint); 2205 2206 /* Process fetched packets */ 2207 status = ath6kl_htc_rx_process_packets(target, &comp_pktq, 2208 look_aheads, 2209 &num_look_ahead); 2210 2211 if (!num_look_ahead || status) 2212 break; 2213 2214 /* 2215 * For SYNCH processing, if we get here, we are running 2216 * through the loop again due to a detected lookahead. Set 2217 * flag that we should re-check IRQ status registers again 2218 * before leaving IRQ processing, this can net better 2219 * performance in high throughput situations. 2220 */ 2221 target->chk_irq_status_cnt = 1; 2222 } 2223 2224 if (status) { 2225 if (status != -ECANCELED) 2226 ath6kl_err("failed to get pending recv messages: %d\n", 2227 status); 2228 2229 /* cleanup any packets in sync completion queue */ 2230 list_for_each_entry_safe(packets, tmp_pkt, &comp_pktq, list) { 2231 list_del(&packets->list); 2232 htc_reclaim_rxbuf(target, packets, 2233 &target->endpoint[packets->endpoint]); 2234 } 2235 2236 if (target->htc_flags & HTC_OP_STATE_STOPPING) { 2237 ath6kl_warn("host is going to stop blocking receiver for htc_stop\n"); 2238 ath6kl_hif_rx_control(target->dev, false); 2239 } 2240 } 2241 2242 /* 2243 * Before leaving, check to see if host ran out of buffers and 2244 * needs to stop the receiver. 2245 */ 2246 if (target->rx_st_flags & HTC_RECV_WAIT_BUFFERS) { 2247 ath6kl_warn("host has no rx buffers blocking receiver to prevent overrun\n"); 2248 ath6kl_hif_rx_control(target->dev, false); 2249 } 2250 *num_pkts = n_fetched; 2251 2252 return status; 2253} 2254 2255/* 2256 * Synchronously wait for a control message from the target, 2257 * This function is used at initialization time ONLY. At init messages 2258 * on ENDPOINT 0 are expected. 2259 */ 2260static struct htc_packet *htc_wait_for_ctrl_msg(struct htc_target *target) 2261{ 2262 struct htc_packet *packet = NULL; 2263 struct htc_frame_look_ahead look_ahead; 2264 2265 if (ath6kl_hif_poll_mboxmsg_rx(target->dev, &look_ahead.word, 2266 HTC_TARGET_RESPONSE_TIMEOUT)) 2267 return NULL; 2268 2269 ath6kl_dbg(ATH6KL_DBG_HTC, 2270 "htc rx wait ctrl look_ahead 0x%X\n", look_ahead.word); 2271 2272 if (look_ahead.eid != ENDPOINT_0) 2273 return NULL; 2274 2275 packet = htc_get_control_buf(target, false); 2276 2277 if (!packet) 2278 return NULL; 2279 2280 packet->info.rx.rx_flags = 0; 2281 packet->info.rx.exp_hdr = look_ahead.word; 2282 packet->act_len = le16_to_cpu(look_ahead.payld_len) + HTC_HDR_LENGTH; 2283 2284 if (packet->act_len > packet->buf_len) 2285 goto fail_ctrl_rx; 2286 2287 /* we want synchronous operation */ 2288 packet->completion = NULL; 2289 2290 /* get the message from the device, this will block */ 2291 if (ath6kl_htc_rx_packet(target, packet, packet->act_len)) 2292 goto fail_ctrl_rx; 2293 2294 trace_ath6kl_htc_rx(packet->status, packet->endpoint, 2295 packet->buf, packet->act_len); 2296 2297 /* process receive header */ 2298 packet->status = ath6kl_htc_rx_process_hdr(target, packet, NULL, NULL); 2299 2300 if (packet->status) { 2301 ath6kl_err("htc_wait_for_ctrl_msg, ath6kl_htc_rx_process_hdr failed (status = %d)\n", 2302 packet->status); 2303 goto fail_ctrl_rx; 2304 } 2305 2306 return packet; 2307 2308fail_ctrl_rx: 2309 if (packet != NULL) { 2310 htc_rxpkt_reset(packet); 2311 reclaim_rx_ctrl_buf(target, packet); 2312 } 2313 2314 return NULL; 2315} 2316 2317static int ath6kl_htc_mbox_add_rxbuf_multiple(struct htc_target *target, 2318 struct list_head *pkt_queue) 2319{ 2320 struct htc_endpoint *endpoint; 2321 struct htc_packet *first_pkt; 2322 bool rx_unblock = false; 2323 int status = 0, depth; 2324 2325 if (list_empty(pkt_queue)) 2326 return -ENOMEM; 2327 2328 first_pkt = list_first_entry(pkt_queue, struct htc_packet, list); 2329 2330 if (first_pkt->endpoint >= ENDPOINT_MAX) 2331 return status; 2332 2333 depth = get_queue_depth(pkt_queue); 2334 2335 ath6kl_dbg(ATH6KL_DBG_HTC, 2336 "htc rx add multiple ep id %d cnt %d len %d\n", 2337 first_pkt->endpoint, depth, first_pkt->buf_len); 2338 2339 endpoint = &target->endpoint[first_pkt->endpoint]; 2340 2341 if (target->htc_flags & HTC_OP_STATE_STOPPING) { 2342 struct htc_packet *packet, *tmp_pkt; 2343 2344 /* walk through queue and mark each one canceled */ 2345 list_for_each_entry_safe(packet, tmp_pkt, pkt_queue, list) { 2346 packet->status = -ECANCELED; 2347 list_del(&packet->list); 2348 ath6kl_htc_rx_complete(endpoint, packet); 2349 } 2350 2351 return status; 2352 } 2353 2354 spin_lock_bh(&target->rx_lock); 2355 2356 list_splice_tail_init(pkt_queue, &endpoint->rx_bufq); 2357 2358 /* check if we are blocked waiting for a new buffer */ 2359 if (target->rx_st_flags & HTC_RECV_WAIT_BUFFERS) { 2360 if (target->ep_waiting == first_pkt->endpoint) { 2361 ath6kl_dbg(ATH6KL_DBG_HTC, 2362 "htc rx blocked on ep %d, unblocking\n", 2363 target->ep_waiting); 2364 target->rx_st_flags &= ~HTC_RECV_WAIT_BUFFERS; 2365 target->ep_waiting = ENDPOINT_MAX; 2366 rx_unblock = true; 2367 } 2368 } 2369 2370 spin_unlock_bh(&target->rx_lock); 2371 2372 if (rx_unblock && !(target->htc_flags & HTC_OP_STATE_STOPPING)) 2373 /* TODO : implement a buffer threshold count? */ 2374 ath6kl_hif_rx_control(target->dev, true); 2375 2376 return status; 2377} 2378 2379static void ath6kl_htc_mbox_flush_rx_buf(struct htc_target *target) 2380{ 2381 struct htc_endpoint *endpoint; 2382 struct htc_packet *packet, *tmp_pkt; 2383 int i; 2384 2385 for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) { 2386 endpoint = &target->endpoint[i]; 2387 if (!endpoint->svc_id) 2388 /* not in use.. */ 2389 continue; 2390 2391 spin_lock_bh(&target->rx_lock); 2392 list_for_each_entry_safe(packet, tmp_pkt, 2393 &endpoint->rx_bufq, list) { 2394 list_del(&packet->list); 2395 spin_unlock_bh(&target->rx_lock); 2396 ath6kl_dbg(ATH6KL_DBG_HTC, 2397 "htc rx flush pkt 0x%p len %d ep %d\n", 2398 packet, packet->buf_len, 2399 packet->endpoint); 2400 /* 2401 * packets in rx_bufq of endpoint 0 have originally 2402 * been queued from target->free_ctrl_rxbuf where 2403 * packet and packet->buf_start are allocated 2404 * separately using kmalloc(). For other endpoint 2405 * rx_bufq, it is allocated as skb where packet is 2406 * skb->head. Take care of this difference while freeing 2407 * the memory. 2408 */ 2409 if (packet->endpoint == ENDPOINT_0) { 2410 kfree(packet->buf_start); 2411 kfree(packet); 2412 } else { 2413 dev_kfree_skb(packet->pkt_cntxt); 2414 } 2415 spin_lock_bh(&target->rx_lock); 2416 } 2417 spin_unlock_bh(&target->rx_lock); 2418 } 2419} 2420 2421static int ath6kl_htc_mbox_conn_service(struct htc_target *target, 2422 struct htc_service_connect_req *conn_req, 2423 struct htc_service_connect_resp *conn_resp) 2424{ 2425 struct htc_packet *rx_pkt = NULL; 2426 struct htc_packet *tx_pkt = NULL; 2427 struct htc_conn_service_resp *resp_msg; 2428 struct htc_conn_service_msg *conn_msg; 2429 struct htc_endpoint *endpoint; 2430 enum htc_endpoint_id assigned_ep = ENDPOINT_MAX; 2431 unsigned int max_msg_sz = 0; 2432 int status = 0; 2433 u16 msg_id; 2434 2435 ath6kl_dbg(ATH6KL_DBG_HTC, 2436 "htc connect service target 0x%p service id 0x%x\n", 2437 target, conn_req->svc_id); 2438 2439 if (conn_req->svc_id == HTC_CTRL_RSVD_SVC) { 2440 /* special case for pseudo control service */ 2441 assigned_ep = ENDPOINT_0; 2442 max_msg_sz = HTC_MAX_CTRL_MSG_LEN; 2443 } else { 2444 /* allocate a packet to send to the target */ 2445 tx_pkt = htc_get_control_buf(target, true); 2446 2447 if (!tx_pkt) 2448 return -ENOMEM; 2449 2450 conn_msg = (struct htc_conn_service_msg *)tx_pkt->buf; 2451 memset(conn_msg, 0, sizeof(*conn_msg)); 2452 conn_msg->msg_id = cpu_to_le16(HTC_MSG_CONN_SVC_ID); 2453 conn_msg->svc_id = cpu_to_le16(conn_req->svc_id); 2454 conn_msg->conn_flags = cpu_to_le16(conn_req->conn_flags); 2455 2456 set_htc_pkt_info(tx_pkt, NULL, (u8 *) conn_msg, 2457 sizeof(*conn_msg) + conn_msg->svc_meta_len, 2458 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG); 2459 2460 /* we want synchronous operation */ 2461 tx_pkt->completion = NULL; 2462 ath6kl_htc_tx_prep_pkt(tx_pkt, 0, 0, 0); 2463 status = ath6kl_htc_tx_issue(target, tx_pkt); 2464 2465 if (status) 2466 goto fail_tx; 2467 2468 /* wait for response */ 2469 rx_pkt = htc_wait_for_ctrl_msg(target); 2470 2471 if (!rx_pkt) { 2472 status = -ENOMEM; 2473 goto fail_tx; 2474 } 2475 2476 resp_msg = (struct htc_conn_service_resp *)rx_pkt->buf; 2477 msg_id = le16_to_cpu(resp_msg->msg_id); 2478 2479 if ((msg_id != HTC_MSG_CONN_SVC_RESP_ID) || 2480 (rx_pkt->act_len < sizeof(*resp_msg))) { 2481 status = -ENOMEM; 2482 goto fail_tx; 2483 } 2484 2485 conn_resp->resp_code = resp_msg->status; 2486 /* check response status */ 2487 if (resp_msg->status != HTC_SERVICE_SUCCESS) { 2488 ath6kl_err("target failed service 0x%X connect request (status:%d)\n", 2489 resp_msg->svc_id, resp_msg->status); 2490 status = -ENOMEM; 2491 goto fail_tx; 2492 } 2493 2494 assigned_ep = (enum htc_endpoint_id)resp_msg->eid; 2495 max_msg_sz = le16_to_cpu(resp_msg->max_msg_sz); 2496 } 2497 2498 if (WARN_ON_ONCE(assigned_ep == ENDPOINT_UNUSED || 2499 assigned_ep >= ENDPOINT_MAX || !max_msg_sz)) { 2500 status = -ENOMEM; 2501 goto fail_tx; 2502 } 2503 2504 endpoint = &target->endpoint[assigned_ep]; 2505 endpoint->eid = assigned_ep; 2506 if (endpoint->svc_id) { 2507 status = -ENOMEM; 2508 goto fail_tx; 2509 } 2510 2511 /* return assigned endpoint to caller */ 2512 conn_resp->endpoint = assigned_ep; 2513 conn_resp->len_max = max_msg_sz; 2514 2515 /* setup the endpoint */ 2516 2517 /* this marks the endpoint in use */ 2518 endpoint->svc_id = conn_req->svc_id; 2519 2520 endpoint->max_txq_depth = conn_req->max_txq_depth; 2521 endpoint->len_max = max_msg_sz; 2522 endpoint->ep_cb = conn_req->ep_cb; 2523 endpoint->cred_dist.svc_id = conn_req->svc_id; 2524 endpoint->cred_dist.htc_ep = endpoint; 2525 endpoint->cred_dist.endpoint = assigned_ep; 2526 endpoint->cred_dist.cred_sz = target->tgt_cred_sz; 2527 2528 switch (endpoint->svc_id) { 2529 case WMI_DATA_BK_SVC: 2530 endpoint->tx_drop_packet_threshold = MAX_DEF_COOKIE_NUM / 3; 2531 break; 2532 default: 2533 endpoint->tx_drop_packet_threshold = MAX_HI_COOKIE_NUM; 2534 break; 2535 } 2536 2537 if (conn_req->max_rxmsg_sz) { 2538 /* 2539 * Override cred_per_msg calculation, this optimizes 2540 * the credit-low indications since the host will actually 2541 * issue smaller messages in the Send path. 2542 */ 2543 if (conn_req->max_rxmsg_sz > max_msg_sz) { 2544 status = -ENOMEM; 2545 goto fail_tx; 2546 } 2547 endpoint->cred_dist.cred_per_msg = 2548 conn_req->max_rxmsg_sz / target->tgt_cred_sz; 2549 } else 2550 endpoint->cred_dist.cred_per_msg = 2551 max_msg_sz / target->tgt_cred_sz; 2552 2553 if (!endpoint->cred_dist.cred_per_msg) 2554 endpoint->cred_dist.cred_per_msg = 1; 2555 2556 /* save local connection flags */ 2557 endpoint->conn_flags = conn_req->flags; 2558 2559fail_tx: 2560 if (tx_pkt) 2561 htc_reclaim_txctrl_buf(target, tx_pkt); 2562 2563 if (rx_pkt) { 2564 htc_rxpkt_reset(rx_pkt); 2565 reclaim_rx_ctrl_buf(target, rx_pkt); 2566 } 2567 2568 return status; 2569} 2570 2571static void reset_ep_state(struct htc_target *target) 2572{ 2573 struct htc_endpoint *endpoint; 2574 int i; 2575 2576 for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) { 2577 endpoint = &target->endpoint[i]; 2578 memset(&endpoint->cred_dist, 0, sizeof(endpoint->cred_dist)); 2579 endpoint->svc_id = 0; 2580 endpoint->len_max = 0; 2581 endpoint->max_txq_depth = 0; 2582 memset(&endpoint->ep_st, 0, 2583 sizeof(endpoint->ep_st)); 2584 INIT_LIST_HEAD(&endpoint->rx_bufq); 2585 INIT_LIST_HEAD(&endpoint->txq); 2586 endpoint->target = target; 2587 } 2588 2589 /* reset distribution list */ 2590 /* FIXME: free existing entries */ 2591 INIT_LIST_HEAD(&target->cred_dist_list); 2592} 2593 2594static int ath6kl_htc_mbox_get_rxbuf_num(struct htc_target *target, 2595 enum htc_endpoint_id endpoint) 2596{ 2597 int num; 2598 2599 spin_lock_bh(&target->rx_lock); 2600 num = get_queue_depth(&(target->endpoint[endpoint].rx_bufq)); 2601 spin_unlock_bh(&target->rx_lock); 2602 return num; 2603} 2604 2605static void htc_setup_msg_bndl(struct htc_target *target) 2606{ 2607 /* limit what HTC can handle */ 2608 target->msg_per_bndl_max = min(HTC_HOST_MAX_MSG_PER_BUNDLE, 2609 target->msg_per_bndl_max); 2610 2611 if (ath6kl_hif_enable_scatter(target->dev->ar)) { 2612 target->msg_per_bndl_max = 0; 2613 return; 2614 } 2615 2616 /* limit bundle what the device layer can handle */ 2617 target->msg_per_bndl_max = min(target->max_scat_entries, 2618 target->msg_per_bndl_max); 2619 2620 ath6kl_dbg(ATH6KL_DBG_BOOT, 2621 "htc bundling allowed msg_per_bndl_max %d\n", 2622 target->msg_per_bndl_max); 2623 2624 /* Max rx bundle size is limited by the max tx bundle size */ 2625 target->max_rx_bndl_sz = target->max_xfer_szper_scatreq; 2626 /* Max tx bundle size if limited by the extended mbox address range */ 2627 target->max_tx_bndl_sz = min(HIF_MBOX0_EXT_WIDTH, 2628 target->max_xfer_szper_scatreq); 2629 2630 ath6kl_dbg(ATH6KL_DBG_BOOT, "htc max_rx_bndl_sz %d max_tx_bndl_sz %d\n", 2631 target->max_rx_bndl_sz, target->max_tx_bndl_sz); 2632 2633 if (target->max_tx_bndl_sz) 2634 /* tx_bndl_mask is enabled per AC, each has 1 bit */ 2635 target->tx_bndl_mask = (1 << WMM_NUM_AC) - 1; 2636 2637 if (target->max_rx_bndl_sz) 2638 target->rx_bndl_enable = true; 2639 2640 if ((target->tgt_cred_sz % target->block_sz) != 0) { 2641 ath6kl_warn("credit size: %d is not block aligned! Disabling send bundling\n", 2642 target->tgt_cred_sz); 2643 2644 /* 2645 * Disallow send bundling since the credit size is 2646 * not aligned to a block size the I/O block 2647 * padding will spill into the next credit buffer 2648 * which is fatal. 2649 */ 2650 target->tx_bndl_mask = 0; 2651 } 2652} 2653 2654static int ath6kl_htc_mbox_wait_target(struct htc_target *target) 2655{ 2656 struct htc_packet *packet = NULL; 2657 struct htc_ready_ext_msg *rdy_msg; 2658 struct htc_service_connect_req connect; 2659 struct htc_service_connect_resp resp; 2660 int status; 2661 2662 /* we should be getting 1 control message that the target is ready */ 2663 packet = htc_wait_for_ctrl_msg(target); 2664 2665 if (!packet) 2666 return -ENOMEM; 2667 2668 /* we controlled the buffer creation so it's properly aligned */ 2669 rdy_msg = (struct htc_ready_ext_msg *)packet->buf; 2670 2671 if ((le16_to_cpu(rdy_msg->ver2_0_info.msg_id) != HTC_MSG_READY_ID) || 2672 (packet->act_len < sizeof(struct htc_ready_msg))) { 2673 status = -ENOMEM; 2674 goto fail_wait_target; 2675 } 2676 2677 if (!rdy_msg->ver2_0_info.cred_cnt || !rdy_msg->ver2_0_info.cred_sz) { 2678 status = -ENOMEM; 2679 goto fail_wait_target; 2680 } 2681 2682 target->tgt_creds = le16_to_cpu(rdy_msg->ver2_0_info.cred_cnt); 2683 target->tgt_cred_sz = le16_to_cpu(rdy_msg->ver2_0_info.cred_sz); 2684 2685 ath6kl_dbg(ATH6KL_DBG_BOOT, 2686 "htc target ready credits %d size %d\n", 2687 target->tgt_creds, target->tgt_cred_sz); 2688 2689 /* check if this is an extended ready message */ 2690 if (packet->act_len >= sizeof(struct htc_ready_ext_msg)) { 2691 /* this is an extended message */ 2692 target->htc_tgt_ver = rdy_msg->htc_ver; 2693 target->msg_per_bndl_max = rdy_msg->msg_per_htc_bndl; 2694 } else { 2695 /* legacy */ 2696 target->htc_tgt_ver = HTC_VERSION_2P0; 2697 target->msg_per_bndl_max = 0; 2698 } 2699 2700 ath6kl_dbg(ATH6KL_DBG_BOOT, "htc using protocol %s (%d)\n", 2701 (target->htc_tgt_ver == HTC_VERSION_2P0) ? "2.0" : ">= 2.1", 2702 target->htc_tgt_ver); 2703 2704 if (target->msg_per_bndl_max > 0) 2705 htc_setup_msg_bndl(target); 2706 2707 /* setup our pseudo HTC control endpoint connection */ 2708 memset(&connect, 0, sizeof(connect)); 2709 memset(&resp, 0, sizeof(resp)); 2710 connect.ep_cb.rx = htc_ctrl_rx; 2711 connect.ep_cb.rx_refill = NULL; 2712 connect.ep_cb.tx_full = NULL; 2713 connect.max_txq_depth = NUM_CONTROL_BUFFERS; 2714 connect.svc_id = HTC_CTRL_RSVD_SVC; 2715 2716 /* connect fake service */ 2717 status = ath6kl_htc_mbox_conn_service((void *)target, &connect, &resp); 2718 2719 if (status) 2720 /* 2721 * FIXME: this call doesn't make sense, the caller should 2722 * call ath6kl_htc_mbox_cleanup() when it wants remove htc 2723 */ 2724 ath6kl_hif_cleanup_scatter(target->dev->ar); 2725 2726fail_wait_target: 2727 if (packet) { 2728 htc_rxpkt_reset(packet); 2729 reclaim_rx_ctrl_buf(target, packet); 2730 } 2731 2732 return status; 2733} 2734 2735/* 2736 * Start HTC, enable interrupts and let the target know 2737 * host has finished setup. 2738 */ 2739static int ath6kl_htc_mbox_start(struct htc_target *target) 2740{ 2741 struct htc_packet *packet; 2742 int status; 2743 2744 memset(&target->dev->irq_proc_reg, 0, 2745 sizeof(target->dev->irq_proc_reg)); 2746 2747 /* Disable interrupts at the chip level */ 2748 ath6kl_hif_disable_intrs(target->dev); 2749 2750 target->htc_flags = 0; 2751 target->rx_st_flags = 0; 2752 2753 /* Push control receive buffers into htc control endpoint */ 2754 while ((packet = htc_get_control_buf(target, false)) != NULL) { 2755 status = htc_add_rxbuf(target, packet); 2756 if (status) 2757 return status; 2758 } 2759 2760 /* NOTE: the first entry in the distribution list is ENDPOINT_0 */ 2761 ath6kl_credit_init(target->credit_info, &target->cred_dist_list, 2762 target->tgt_creds); 2763 2764 dump_cred_dist_stats(target); 2765 2766 /* Indicate to the target of the setup completion */ 2767 status = htc_setup_tx_complete(target); 2768 2769 if (status) 2770 return status; 2771 2772 /* unmask interrupts */ 2773 status = ath6kl_hif_unmask_intrs(target->dev); 2774 2775 if (status) 2776 ath6kl_htc_mbox_stop(target); 2777 2778 return status; 2779} 2780 2781static int ath6kl_htc_reset(struct htc_target *target) 2782{ 2783 u32 block_size, ctrl_bufsz; 2784 struct htc_packet *packet; 2785 int i; 2786 2787 reset_ep_state(target); 2788 2789 block_size = target->dev->ar->mbox_info.block_size; 2790 2791 ctrl_bufsz = (block_size > HTC_MAX_CTRL_MSG_LEN) ? 2792 (block_size + HTC_HDR_LENGTH) : 2793 (HTC_MAX_CTRL_MSG_LEN + HTC_HDR_LENGTH); 2794 2795 for (i = 0; i < NUM_CONTROL_BUFFERS; i++) { 2796 packet = kzalloc(sizeof(*packet), GFP_KERNEL); 2797 if (!packet) 2798 return -ENOMEM; 2799 2800 packet->buf_start = kzalloc(ctrl_bufsz, GFP_KERNEL); 2801 if (!packet->buf_start) { 2802 kfree(packet); 2803 return -ENOMEM; 2804 } 2805 2806 packet->buf_len = ctrl_bufsz; 2807 if (i < NUM_CONTROL_RX_BUFFERS) { 2808 packet->act_len = 0; 2809 packet->buf = packet->buf_start; 2810 packet->endpoint = ENDPOINT_0; 2811 list_add_tail(&packet->list, &target->free_ctrl_rxbuf); 2812 } else { 2813 list_add_tail(&packet->list, &target->free_ctrl_txbuf); 2814 } 2815 } 2816 2817 return 0; 2818} 2819 2820/* htc_stop: stop interrupt reception, and flush all queued buffers */ 2821static void ath6kl_htc_mbox_stop(struct htc_target *target) 2822{ 2823 spin_lock_bh(&target->htc_lock); 2824 target->htc_flags |= HTC_OP_STATE_STOPPING; 2825 spin_unlock_bh(&target->htc_lock); 2826 2827 /* 2828 * Masking interrupts is a synchronous operation, when this 2829 * function returns all pending HIF I/O has completed, we can 2830 * safely flush the queues. 2831 */ 2832 ath6kl_hif_mask_intrs(target->dev); 2833 2834 ath6kl_htc_flush_txep_all(target); 2835 2836 ath6kl_htc_mbox_flush_rx_buf(target); 2837 2838 ath6kl_htc_reset(target); 2839} 2840 2841static void *ath6kl_htc_mbox_create(struct ath6kl *ar) 2842{ 2843 struct htc_target *target = NULL; 2844 int status = 0; 2845 2846 target = kzalloc(sizeof(*target), GFP_KERNEL); 2847 if (!target) { 2848 ath6kl_err("unable to allocate memory\n"); 2849 return NULL; 2850 } 2851 2852 target->dev = kzalloc(sizeof(*target->dev), GFP_KERNEL); 2853 if (!target->dev) { 2854 ath6kl_err("unable to allocate memory\n"); 2855 kfree(target); 2856 return NULL; 2857 } 2858 2859 spin_lock_init(&target->htc_lock); 2860 spin_lock_init(&target->rx_lock); 2861 spin_lock_init(&target->tx_lock); 2862 2863 INIT_LIST_HEAD(&target->free_ctrl_txbuf); 2864 INIT_LIST_HEAD(&target->free_ctrl_rxbuf); 2865 INIT_LIST_HEAD(&target->cred_dist_list); 2866 2867 target->dev->ar = ar; 2868 target->dev->htc_cnxt = target; 2869 target->ep_waiting = ENDPOINT_MAX; 2870 2871 status = ath6kl_hif_setup(target->dev); 2872 if (status) 2873 goto err_htc_cleanup; 2874 2875 status = ath6kl_htc_reset(target); 2876 if (status) 2877 goto err_htc_cleanup; 2878 2879 return target; 2880 2881err_htc_cleanup: 2882 ath6kl_htc_mbox_cleanup(target); 2883 2884 return NULL; 2885} 2886 2887/* cleanup the HTC instance */ 2888static void ath6kl_htc_mbox_cleanup(struct htc_target *target) 2889{ 2890 struct htc_packet *packet, *tmp_packet; 2891 2892 ath6kl_hif_cleanup_scatter(target->dev->ar); 2893 2894 list_for_each_entry_safe(packet, tmp_packet, 2895 &target->free_ctrl_txbuf, list) { 2896 list_del(&packet->list); 2897 kfree(packet->buf_start); 2898 kfree(packet); 2899 } 2900 2901 list_for_each_entry_safe(packet, tmp_packet, 2902 &target->free_ctrl_rxbuf, list) { 2903 list_del(&packet->list); 2904 kfree(packet->buf_start); 2905 kfree(packet); 2906 } 2907 2908 kfree(target->dev); 2909 kfree(target); 2910} 2911 2912static const struct ath6kl_htc_ops ath6kl_htc_mbox_ops = { 2913 .create = ath6kl_htc_mbox_create, 2914 .wait_target = ath6kl_htc_mbox_wait_target, 2915 .start = ath6kl_htc_mbox_start, 2916 .conn_service = ath6kl_htc_mbox_conn_service, 2917 .tx = ath6kl_htc_mbox_tx, 2918 .stop = ath6kl_htc_mbox_stop, 2919 .cleanup = ath6kl_htc_mbox_cleanup, 2920 .flush_txep = ath6kl_htc_mbox_flush_txep, 2921 .flush_rx_buf = ath6kl_htc_mbox_flush_rx_buf, 2922 .activity_changed = ath6kl_htc_mbox_activity_changed, 2923 .get_rxbuf_num = ath6kl_htc_mbox_get_rxbuf_num, 2924 .add_rxbuf_multiple = ath6kl_htc_mbox_add_rxbuf_multiple, 2925 .credit_setup = ath6kl_htc_mbox_credit_setup, 2926}; 2927 2928void ath6kl_htc_mbox_attach(struct ath6kl *ar) 2929{ 2930 ar->htc_ops = &ath6kl_htc_mbox_ops; 2931} 2932