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 <asm/unaligned.h> 23 24 #define CALC_TXRX_PADDED_LEN(dev, len) (__ALIGN_MASK((len), (dev)->block_mask)) 25 26 static void ath6kl_htc_mbox_cleanup(struct htc_target *target); 27 static void ath6kl_htc_mbox_stop(struct htc_target *target); 28 static int ath6kl_htc_mbox_add_rxbuf_multiple(struct htc_target *target, 29 struct list_head *pkt_queue); 30 static void ath6kl_htc_set_credit_dist(struct htc_target *target, 31 struct ath6kl_htc_credit_info *cred_info, 32 u16 svc_pri_order[], int len); 33 34 /* threshold to re-enable Tx bundling for an AC*/ 35 #define TX_RESUME_BUNDLE_THRESHOLD 1500 36 37 /* Functions for Tx credit handling */ 38 static void ath6kl_credit_deposit(struct ath6kl_htc_credit_info *cred_info, 39 struct htc_endpoint_credit_dist *ep_dist, 40 int credits) 41 { 42 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit deposit ep %d credits %d\n", 43 ep_dist->endpoint, credits); 44 45 ep_dist->credits += credits; 46 ep_dist->cred_assngd += credits; 47 cred_info->cur_free_credits -= credits; 48 } 49 50 static void ath6kl_credit_init(struct ath6kl_htc_credit_info *cred_info, 51 struct list_head *ep_list, 52 int tot_credits) 53 { 54 struct htc_endpoint_credit_dist *cur_ep_dist; 55 int count; 56 57 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit init total %d\n", tot_credits); 58 59 cred_info->cur_free_credits = tot_credits; 60 cred_info->total_avail_credits = tot_credits; 61 62 list_for_each_entry(cur_ep_dist, ep_list, list) { 63 if (cur_ep_dist->endpoint == ENDPOINT_0) 64 continue; 65 66 cur_ep_dist->cred_min = cur_ep_dist->cred_per_msg; 67 68 if (tot_credits > 4) { 69 if ((cur_ep_dist->svc_id == WMI_DATA_BK_SVC) || 70 (cur_ep_dist->svc_id == WMI_DATA_BE_SVC)) { 71 ath6kl_credit_deposit(cred_info, 72 cur_ep_dist, 73 cur_ep_dist->cred_min); 74 cur_ep_dist->dist_flags |= HTC_EP_ACTIVE; 75 } 76 } 77 78 if (cur_ep_dist->svc_id == WMI_CONTROL_SVC) { 79 ath6kl_credit_deposit(cred_info, cur_ep_dist, 80 cur_ep_dist->cred_min); 81 /* 82 * Control service is always marked active, it 83 * never goes inactive EVER. 84 */ 85 cur_ep_dist->dist_flags |= HTC_EP_ACTIVE; 86 } 87 88 /* 89 * Streams have to be created (explicit | implicit) for all 90 * kinds of traffic. BE endpoints are also inactive in the 91 * beginning. When BE traffic starts it creates implicit 92 * streams that redistributes credits. 93 * 94 * Note: all other endpoints have minimums set but are 95 * initially given NO credits. credits will be distributed 96 * as traffic activity demands 97 */ 98 } 99 100 /* 101 * For ath6kl_credit_seek function, 102 * it use list_for_each_entry_reverse to walk around the whole ep list. 103 * Therefore assign this lowestpri_ep_dist after walk around the ep_list 104 */ 105 cred_info->lowestpri_ep_dist = cur_ep_dist->list; 106 107 WARN_ON(cred_info->cur_free_credits <= 0); 108 109 list_for_each_entry(cur_ep_dist, ep_list, list) { 110 if (cur_ep_dist->endpoint == ENDPOINT_0) 111 continue; 112 113 if (cur_ep_dist->svc_id == WMI_CONTROL_SVC) 114 cur_ep_dist->cred_norm = cur_ep_dist->cred_per_msg; 115 else { 116 /* 117 * For the remaining data endpoints, we assume that 118 * each cred_per_msg are the same. We use a simple 119 * calculation here, we take the remaining credits 120 * and determine how many max messages this can 121 * cover and then set each endpoint's normal value 122 * equal to 3/4 this amount. 123 */ 124 count = (cred_info->cur_free_credits / 125 cur_ep_dist->cred_per_msg) 126 * cur_ep_dist->cred_per_msg; 127 count = (count * 3) >> 2; 128 count = max(count, cur_ep_dist->cred_per_msg); 129 cur_ep_dist->cred_norm = count; 130 131 } 132 133 ath6kl_dbg(ATH6KL_DBG_CREDIT, 134 "credit ep %d svc_id %d credits %d per_msg %d norm %d min %d\n", 135 cur_ep_dist->endpoint, 136 cur_ep_dist->svc_id, 137 cur_ep_dist->credits, 138 cur_ep_dist->cred_per_msg, 139 cur_ep_dist->cred_norm, 140 cur_ep_dist->cred_min); 141 } 142 } 143 144 /* initialize and setup credit distribution */ 145 static int ath6kl_htc_mbox_credit_setup(struct htc_target *htc_target, 146 struct ath6kl_htc_credit_info *cred_info) 147 { 148 u16 servicepriority[5]; 149 150 memset(cred_info, 0, sizeof(struct ath6kl_htc_credit_info)); 151 152 servicepriority[0] = WMI_CONTROL_SVC; /* highest */ 153 servicepriority[1] = WMI_DATA_VO_SVC; 154 servicepriority[2] = WMI_DATA_VI_SVC; 155 servicepriority[3] = WMI_DATA_BE_SVC; 156 servicepriority[4] = WMI_DATA_BK_SVC; /* lowest */ 157 158 /* set priority list */ 159 ath6kl_htc_set_credit_dist(htc_target, cred_info, servicepriority, 5); 160 161 return 0; 162 } 163 164 /* reduce an ep's credits back to a set limit */ 165 static void ath6kl_credit_reduce(struct ath6kl_htc_credit_info *cred_info, 166 struct htc_endpoint_credit_dist *ep_dist, 167 int limit) 168 { 169 int credits; 170 171 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit reduce ep %d limit %d\n", 172 ep_dist->endpoint, limit); 173 174 ep_dist->cred_assngd = limit; 175 176 if (ep_dist->credits <= limit) 177 return; 178 179 credits = ep_dist->credits - limit; 180 ep_dist->credits -= credits; 181 cred_info->cur_free_credits += credits; 182 } 183 184 static void ath6kl_credit_update(struct ath6kl_htc_credit_info *cred_info, 185 struct list_head *epdist_list) 186 { 187 struct htc_endpoint_credit_dist *cur_list; 188 189 list_for_each_entry(cur_list, epdist_list, list) { 190 if (cur_list->endpoint == ENDPOINT_0) 191 continue; 192 193 if (cur_list->cred_to_dist > 0) { 194 cur_list->credits += cur_list->cred_to_dist; 195 cur_list->cred_to_dist = 0; 196 197 if (cur_list->credits > cur_list->cred_assngd) 198 ath6kl_credit_reduce(cred_info, 199 cur_list, 200 cur_list->cred_assngd); 201 202 if (cur_list->credits > cur_list->cred_norm) 203 ath6kl_credit_reduce(cred_info, cur_list, 204 cur_list->cred_norm); 205 206 if (!(cur_list->dist_flags & HTC_EP_ACTIVE)) { 207 if (cur_list->txq_depth == 0) 208 ath6kl_credit_reduce(cred_info, 209 cur_list, 0); 210 } 211 } 212 } 213 } 214 215 /* 216 * HTC has an endpoint that needs credits, ep_dist is the endpoint in 217 * question. 218 */ 219 static void ath6kl_credit_seek(struct ath6kl_htc_credit_info *cred_info, 220 struct htc_endpoint_credit_dist *ep_dist) 221 { 222 struct htc_endpoint_credit_dist *curdist_list; 223 int credits = 0; 224 int need; 225 226 if (ep_dist->svc_id == WMI_CONTROL_SVC) 227 goto out; 228 229 if ((ep_dist->svc_id == WMI_DATA_VI_SVC) || 230 (ep_dist->svc_id == WMI_DATA_VO_SVC)) 231 if ((ep_dist->cred_assngd >= ep_dist->cred_norm)) 232 goto out; 233 234 /* 235 * For all other services, we follow a simple algorithm of: 236 * 237 * 1. checking the free pool for credits 238 * 2. checking lower priority endpoints for credits to take 239 */ 240 241 credits = min(cred_info->cur_free_credits, ep_dist->seek_cred); 242 243 if (credits >= ep_dist->seek_cred) 244 goto out; 245 246 /* 247 * We don't have enough in the free pool, try taking away from 248 * lower priority services The rule for taking away credits: 249 * 250 * 1. Only take from lower priority endpoints 251 * 2. Only take what is allocated above the minimum (never 252 * starve an endpoint completely) 253 * 3. Only take what you need. 254 */ 255 256 list_for_each_entry_reverse(curdist_list, 257 &cred_info->lowestpri_ep_dist, 258 list) { 259 if (curdist_list == ep_dist) 260 break; 261 262 need = ep_dist->seek_cred - cred_info->cur_free_credits; 263 264 if ((curdist_list->cred_assngd - need) >= 265 curdist_list->cred_min) { 266 /* 267 * The current one has been allocated more than 268 * it's minimum and it has enough credits assigned 269 * above it's minimum to fulfill our need try to 270 * take away just enough to fulfill our need. 271 */ 272 ath6kl_credit_reduce(cred_info, curdist_list, 273 curdist_list->cred_assngd - need); 274 275 if (cred_info->cur_free_credits >= 276 ep_dist->seek_cred) 277 break; 278 } 279 280 if (curdist_list->endpoint == ENDPOINT_0) 281 break; 282 } 283 284 credits = min(cred_info->cur_free_credits, ep_dist->seek_cred); 285 286 out: 287 /* did we find some credits? */ 288 if (credits) 289 ath6kl_credit_deposit(cred_info, ep_dist, credits); 290 291 ep_dist->seek_cred = 0; 292 } 293 294 /* redistribute credits based on activity change */ 295 static void ath6kl_credit_redistribute(struct ath6kl_htc_credit_info *info, 296 struct list_head *ep_dist_list) 297 { 298 struct htc_endpoint_credit_dist *curdist_list; 299 300 list_for_each_entry(curdist_list, ep_dist_list, list) { 301 if (curdist_list->endpoint == ENDPOINT_0) 302 continue; 303 304 if ((curdist_list->svc_id == WMI_DATA_BK_SVC) || 305 (curdist_list->svc_id == WMI_DATA_BE_SVC)) 306 curdist_list->dist_flags |= HTC_EP_ACTIVE; 307 308 if ((curdist_list->svc_id != WMI_CONTROL_SVC) && 309 !(curdist_list->dist_flags & HTC_EP_ACTIVE)) { 310 if (curdist_list->txq_depth == 0) 311 ath6kl_credit_reduce(info, curdist_list, 0); 312 else 313 ath6kl_credit_reduce(info, 314 curdist_list, 315 curdist_list->cred_min); 316 } 317 } 318 } 319 320 /* 321 * 322 * This function is invoked whenever endpoints require credit 323 * distributions. A lock is held while this function is invoked, this 324 * function shall NOT block. The ep_dist_list is a list of distribution 325 * structures in prioritized order as defined by the call to the 326 * htc_set_credit_dist() api. 327 */ 328 static void ath6kl_credit_distribute(struct ath6kl_htc_credit_info *cred_info, 329 struct list_head *ep_dist_list, 330 enum htc_credit_dist_reason reason) 331 { 332 switch (reason) { 333 case HTC_CREDIT_DIST_SEND_COMPLETE: 334 ath6kl_credit_update(cred_info, ep_dist_list); 335 break; 336 case HTC_CREDIT_DIST_ACTIVITY_CHANGE: 337 ath6kl_credit_redistribute(cred_info, ep_dist_list); 338 break; 339 default: 340 break; 341 } 342 343 WARN_ON(cred_info->cur_free_credits > cred_info->total_avail_credits); 344 WARN_ON(cred_info->cur_free_credits < 0); 345 } 346 347 static void ath6kl_htc_tx_buf_align(u8 **buf, unsigned long len) 348 { 349 u8 *align_addr; 350 351 if (!IS_ALIGNED((unsigned long) *buf, 4)) { 352 align_addr = PTR_ALIGN(*buf - 4, 4); 353 memmove(align_addr, *buf, len); 354 *buf = align_addr; 355 } 356 } 357 358 static void ath6kl_htc_tx_prep_pkt(struct htc_packet *packet, u8 flags, 359 int ctrl0, int ctrl1) 360 { 361 struct htc_frame_hdr *hdr; 362 363 packet->buf -= HTC_HDR_LENGTH; 364 hdr = (struct htc_frame_hdr *)packet->buf; 365 366 /* Endianess? */ 367 put_unaligned((u16)packet->act_len, &hdr->payld_len); 368 hdr->flags = flags; 369 hdr->eid = packet->endpoint; 370 hdr->ctrl[0] = ctrl0; 371 hdr->ctrl[1] = ctrl1; 372 } 373 374 static void htc_reclaim_txctrl_buf(struct htc_target *target, 375 struct htc_packet *pkt) 376 { 377 spin_lock_bh(&target->htc_lock); 378 list_add_tail(&pkt->list, &target->free_ctrl_txbuf); 379 spin_unlock_bh(&target->htc_lock); 380 } 381 382 static struct htc_packet *htc_get_control_buf(struct htc_target *target, 383 bool tx) 384 { 385 struct htc_packet *packet = NULL; 386 struct list_head *buf_list; 387 388 buf_list = tx ? &target->free_ctrl_txbuf : &target->free_ctrl_rxbuf; 389 390 spin_lock_bh(&target->htc_lock); 391 392 if (list_empty(buf_list)) { 393 spin_unlock_bh(&target->htc_lock); 394 return NULL; 395 } 396 397 packet = list_first_entry(buf_list, struct htc_packet, list); 398 list_del(&packet->list); 399 spin_unlock_bh(&target->htc_lock); 400 401 if (tx) 402 packet->buf = packet->buf_start + HTC_HDR_LENGTH; 403 404 return packet; 405 } 406 407 static void htc_tx_comp_update(struct htc_target *target, 408 struct htc_endpoint *endpoint, 409 struct htc_packet *packet) 410 { 411 packet->completion = NULL; 412 packet->buf += HTC_HDR_LENGTH; 413 414 if (!packet->status) 415 return; 416 417 ath6kl_err("req failed (status:%d, ep:%d, len:%d creds:%d)\n", 418 packet->status, packet->endpoint, packet->act_len, 419 packet->info.tx.cred_used); 420 421 /* on failure to submit, reclaim credits for this packet */ 422 spin_lock_bh(&target->tx_lock); 423 endpoint->cred_dist.cred_to_dist += 424 packet->info.tx.cred_used; 425 endpoint->cred_dist.txq_depth = get_queue_depth(&endpoint->txq); 426 427 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx ctxt 0x%p dist 0x%p\n", 428 target->credit_info, &target->cred_dist_list); 429 430 ath6kl_credit_distribute(target->credit_info, 431 &target->cred_dist_list, 432 HTC_CREDIT_DIST_SEND_COMPLETE); 433 434 spin_unlock_bh(&target->tx_lock); 435 } 436 437 static void htc_tx_complete(struct htc_endpoint *endpoint, 438 struct list_head *txq) 439 { 440 if (list_empty(txq)) 441 return; 442 443 ath6kl_dbg(ATH6KL_DBG_HTC, 444 "htc tx complete ep %d pkts %d\n", 445 endpoint->eid, get_queue_depth(txq)); 446 447 ath6kl_tx_complete(endpoint->target, txq); 448 } 449 450 static void htc_tx_comp_handler(struct htc_target *target, 451 struct htc_packet *packet) 452 { 453 struct htc_endpoint *endpoint = &target->endpoint[packet->endpoint]; 454 struct list_head container; 455 456 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx complete seqno %d\n", 457 packet->info.tx.seqno); 458 459 htc_tx_comp_update(target, endpoint, packet); 460 INIT_LIST_HEAD(&container); 461 list_add_tail(&packet->list, &container); 462 /* do completion */ 463 htc_tx_complete(endpoint, &container); 464 } 465 466 static void htc_async_tx_scat_complete(struct htc_target *target, 467 struct hif_scatter_req *scat_req) 468 { 469 struct htc_endpoint *endpoint; 470 struct htc_packet *packet; 471 struct list_head tx_compq; 472 int i; 473 474 INIT_LIST_HEAD(&tx_compq); 475 476 ath6kl_dbg(ATH6KL_DBG_HTC, 477 "htc tx scat complete len %d entries %d\n", 478 scat_req->len, scat_req->scat_entries); 479 480 if (scat_req->status) 481 ath6kl_err("send scatter req failed: %d\n", scat_req->status); 482 483 packet = scat_req->scat_list[0].packet; 484 endpoint = &target->endpoint[packet->endpoint]; 485 486 /* walk through the scatter list and process */ 487 for (i = 0; i < scat_req->scat_entries; i++) { 488 packet = scat_req->scat_list[i].packet; 489 if (!packet) { 490 WARN_ON(1); 491 return; 492 } 493 494 packet->status = scat_req->status; 495 htc_tx_comp_update(target, endpoint, packet); 496 list_add_tail(&packet->list, &tx_compq); 497 } 498 499 /* free scatter request */ 500 hif_scatter_req_add(target->dev->ar, scat_req); 501 502 /* complete all packets */ 503 htc_tx_complete(endpoint, &tx_compq); 504 } 505 506 static int ath6kl_htc_tx_issue(struct htc_target *target, 507 struct htc_packet *packet) 508 { 509 int status; 510 bool sync = false; 511 u32 padded_len, send_len; 512 513 if (!packet->completion) 514 sync = true; 515 516 send_len = packet->act_len + HTC_HDR_LENGTH; 517 518 padded_len = CALC_TXRX_PADDED_LEN(target, send_len); 519 520 ath6kl_dbg(ATH6KL_DBG_HTC, 521 "htc tx issue len %d seqno %d padded_len %d mbox 0x%X %s\n", 522 send_len, packet->info.tx.seqno, padded_len, 523 target->dev->ar->mbox_info.htc_addr, 524 sync ? "sync" : "async"); 525 526 if (sync) { 527 status = hif_read_write_sync(target->dev->ar, 528 target->dev->ar->mbox_info.htc_addr, 529 packet->buf, padded_len, 530 HIF_WR_SYNC_BLOCK_INC); 531 532 packet->status = status; 533 packet->buf += HTC_HDR_LENGTH; 534 } else 535 status = hif_write_async(target->dev->ar, 536 target->dev->ar->mbox_info.htc_addr, 537 packet->buf, padded_len, 538 HIF_WR_ASYNC_BLOCK_INC, packet); 539 540 return status; 541 } 542 543 static int htc_check_credits(struct htc_target *target, 544 struct htc_endpoint *ep, u8 *flags, 545 enum htc_endpoint_id eid, unsigned int len, 546 int *req_cred) 547 { 548 549 *req_cred = (len > target->tgt_cred_sz) ? 550 DIV_ROUND_UP(len, target->tgt_cred_sz) : 1; 551 552 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit check need %d got %d\n", 553 *req_cred, ep->cred_dist.credits); 554 555 if (ep->cred_dist.credits < *req_cred) { 556 if (eid == ENDPOINT_0) 557 return -EINVAL; 558 559 /* Seek more credits */ 560 ep->cred_dist.seek_cred = *req_cred - ep->cred_dist.credits; 561 562 ath6kl_credit_seek(target->credit_info, &ep->cred_dist); 563 564 ep->cred_dist.seek_cred = 0; 565 566 if (ep->cred_dist.credits < *req_cred) { 567 ath6kl_dbg(ATH6KL_DBG_CREDIT, 568 "credit not found for ep %d\n", 569 eid); 570 return -EINVAL; 571 } 572 } 573 574 ep->cred_dist.credits -= *req_cred; 575 ep->ep_st.cred_cosumd += *req_cred; 576 577 /* When we are getting low on credits, ask for more */ 578 if (ep->cred_dist.credits < ep->cred_dist.cred_per_msg) { 579 ep->cred_dist.seek_cred = 580 ep->cred_dist.cred_per_msg - ep->cred_dist.credits; 581 582 ath6kl_credit_seek(target->credit_info, &ep->cred_dist); 583 584 /* see if we were successful in getting more */ 585 if (ep->cred_dist.credits < ep->cred_dist.cred_per_msg) { 586 /* tell the target we need credits ASAP! */ 587 *flags |= HTC_FLAGS_NEED_CREDIT_UPDATE; 588 ep->ep_st.cred_low_indicate += 1; 589 ath6kl_dbg(ATH6KL_DBG_CREDIT, 590 "credit we need credits asap\n"); 591 } 592 } 593 594 return 0; 595 } 596 597 static void ath6kl_htc_tx_pkts_get(struct htc_target *target, 598 struct htc_endpoint *endpoint, 599 struct list_head *queue) 600 { 601 int req_cred; 602 u8 flags; 603 struct htc_packet *packet; 604 unsigned int len; 605 606 while (true) { 607 608 flags = 0; 609 610 if (list_empty(&endpoint->txq)) 611 break; 612 packet = list_first_entry(&endpoint->txq, struct htc_packet, 613 list); 614 615 ath6kl_dbg(ATH6KL_DBG_HTC, 616 "htc tx got packet 0x%p queue depth %d\n", 617 packet, get_queue_depth(&endpoint->txq)); 618 619 len = CALC_TXRX_PADDED_LEN(target, 620 packet->act_len + HTC_HDR_LENGTH); 621 622 if (htc_check_credits(target, endpoint, &flags, 623 packet->endpoint, len, &req_cred)) 624 break; 625 626 /* now we can fully move onto caller's queue */ 627 packet = list_first_entry(&endpoint->txq, struct htc_packet, 628 list); 629 list_move_tail(&packet->list, queue); 630 631 /* save the number of credits this packet consumed */ 632 packet->info.tx.cred_used = req_cred; 633 634 /* all TX packets are handled asynchronously */ 635 packet->completion = htc_tx_comp_handler; 636 packet->context = target; 637 endpoint->ep_st.tx_issued += 1; 638 639 /* save send flags */ 640 packet->info.tx.flags = flags; 641 packet->info.tx.seqno = endpoint->seqno; 642 endpoint->seqno++; 643 } 644 } 645 646 /* See if the padded tx length falls on a credit boundary */ 647 static int htc_get_credit_padding(unsigned int cred_sz, int *len, 648 struct htc_endpoint *ep) 649 { 650 int rem_cred, cred_pad; 651 652 rem_cred = *len % cred_sz; 653 654 /* No padding needed */ 655 if (!rem_cred) 656 return 0; 657 658 if (!(ep->conn_flags & HTC_FLGS_TX_BNDL_PAD_EN)) 659 return -1; 660 661 /* 662 * The transfer consumes a "partial" credit, this 663 * packet cannot be bundled unless we add 664 * additional "dummy" padding (max 255 bytes) to 665 * consume the entire credit. 666 */ 667 cred_pad = *len < cred_sz ? (cred_sz - *len) : rem_cred; 668 669 if ((cred_pad > 0) && (cred_pad <= 255)) 670 *len += cred_pad; 671 else 672 /* The amount of padding is too large, send as non-bundled */ 673 return -1; 674 675 return cred_pad; 676 } 677 678 static int ath6kl_htc_tx_setup_scat_list(struct htc_target *target, 679 struct htc_endpoint *endpoint, 680 struct hif_scatter_req *scat_req, 681 int n_scat, 682 struct list_head *queue) 683 { 684 struct htc_packet *packet; 685 int i, len, rem_scat, cred_pad; 686 int status = 0; 687 u8 flags; 688 689 rem_scat = target->max_tx_bndl_sz; 690 691 for (i = 0; i < n_scat; i++) { 692 scat_req->scat_list[i].packet = NULL; 693 694 if (list_empty(queue)) 695 break; 696 697 packet = list_first_entry(queue, struct htc_packet, list); 698 len = CALC_TXRX_PADDED_LEN(target, 699 packet->act_len + HTC_HDR_LENGTH); 700 701 cred_pad = htc_get_credit_padding(target->tgt_cred_sz, 702 &len, endpoint); 703 if (cred_pad < 0 || rem_scat < len) { 704 status = -ENOSPC; 705 break; 706 } 707 708 rem_scat -= len; 709 /* now remove it from the queue */ 710 list_del(&packet->list); 711 712 scat_req->scat_list[i].packet = packet; 713 /* prepare packet and flag message as part of a send bundle */ 714 flags = packet->info.tx.flags | HTC_FLAGS_SEND_BUNDLE; 715 ath6kl_htc_tx_prep_pkt(packet, flags, 716 cred_pad, packet->info.tx.seqno); 717 /* Make sure the buffer is 4-byte aligned */ 718 ath6kl_htc_tx_buf_align(&packet->buf, 719 packet->act_len + HTC_HDR_LENGTH); 720 scat_req->scat_list[i].buf = packet->buf; 721 scat_req->scat_list[i].len = len; 722 723 scat_req->len += len; 724 scat_req->scat_entries++; 725 ath6kl_dbg(ATH6KL_DBG_HTC, 726 "htc tx adding (%d) pkt 0x%p seqno %d len %d remaining %d\n", 727 i, packet, packet->info.tx.seqno, len, rem_scat); 728 } 729 730 /* Roll back scatter setup in case of any failure */ 731 if (scat_req->scat_entries < HTC_MIN_HTC_MSGS_TO_BUNDLE) { 732 for (i = scat_req->scat_entries - 1; i >= 0; i--) { 733 packet = scat_req->scat_list[i].packet; 734 if (packet) { 735 packet->buf += HTC_HDR_LENGTH; 736 list_add(&packet->list, queue); 737 } 738 } 739 return -EAGAIN; 740 } 741 742 return status; 743 } 744 745 /* 746 * Drain a queue and send as bundles this function may return without fully 747 * draining the queue when 748 * 749 * 1. scatter resources are exhausted 750 * 2. a message that will consume a partial credit will stop the 751 * bundling process early 752 * 3. we drop below the minimum number of messages for a bundle 753 */ 754 static void ath6kl_htc_tx_bundle(struct htc_endpoint *endpoint, 755 struct list_head *queue, 756 int *sent_bundle, int *n_bundle_pkts) 757 { 758 struct htc_target *target = endpoint->target; 759 struct hif_scatter_req *scat_req = NULL; 760 int n_scat, n_sent_bundle = 0, tot_pkts_bundle = 0; 761 int status; 762 u32 txb_mask; 763 u8 ac = WMM_NUM_AC; 764 765 if ((HTC_CTRL_RSVD_SVC != endpoint->svc_id) && 766 (WMI_CONTROL_SVC != endpoint->svc_id)) 767 ac = target->dev->ar->ep2ac_map[endpoint->eid]; 768 769 while (true) { 770 status = 0; 771 n_scat = get_queue_depth(queue); 772 n_scat = min(n_scat, target->msg_per_bndl_max); 773 774 if (n_scat < HTC_MIN_HTC_MSGS_TO_BUNDLE) 775 /* not enough to bundle */ 776 break; 777 778 scat_req = hif_scatter_req_get(target->dev->ar); 779 780 if (!scat_req) { 781 /* no scatter resources */ 782 ath6kl_dbg(ATH6KL_DBG_HTC, 783 "htc tx no more scatter resources\n"); 784 break; 785 } 786 787 if ((ac < WMM_NUM_AC) && (ac != WMM_AC_BK)) { 788 if (WMM_AC_BE == ac) 789 /* 790 * BE, BK have priorities and bit 791 * positions reversed 792 */ 793 txb_mask = (1 << WMM_AC_BK); 794 else 795 /* 796 * any AC with priority lower than 797 * itself 798 */ 799 txb_mask = ((1 << ac) - 1); 800 801 /* 802 * when the scatter request resources drop below a 803 * certain threshold, disable Tx bundling for all 804 * AC's with priority lower than the current requesting 805 * AC. Otherwise re-enable Tx bundling for them 806 */ 807 if (scat_req->scat_q_depth < ATH6KL_SCATTER_REQS) 808 target->tx_bndl_mask &= ~txb_mask; 809 else 810 target->tx_bndl_mask |= txb_mask; 811 } 812 813 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx pkts to scatter: %d\n", 814 n_scat); 815 816 scat_req->len = 0; 817 scat_req->scat_entries = 0; 818 819 status = ath6kl_htc_tx_setup_scat_list(target, endpoint, 820 scat_req, n_scat, 821 queue); 822 if (status == -EAGAIN) { 823 hif_scatter_req_add(target->dev->ar, scat_req); 824 break; 825 } 826 827 /* send path is always asynchronous */ 828 scat_req->complete = htc_async_tx_scat_complete; 829 n_sent_bundle++; 830 tot_pkts_bundle += scat_req->scat_entries; 831 832 ath6kl_dbg(ATH6KL_DBG_HTC, 833 "htc tx scatter bytes %d entries %d\n", 834 scat_req->len, scat_req->scat_entries); 835 ath6kl_hif_submit_scat_req(target->dev, scat_req, false); 836 837 if (status) 838 break; 839 } 840 841 *sent_bundle = n_sent_bundle; 842 *n_bundle_pkts = tot_pkts_bundle; 843 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx bundle sent %d pkts\n", 844 n_sent_bundle); 845 846 return; 847 } 848 849 static void ath6kl_htc_tx_from_queue(struct htc_target *target, 850 struct htc_endpoint *endpoint) 851 { 852 struct list_head txq; 853 struct htc_packet *packet; 854 int bundle_sent; 855 int n_pkts_bundle; 856 u8 ac = WMM_NUM_AC; 857 858 spin_lock_bh(&target->tx_lock); 859 860 endpoint->tx_proc_cnt++; 861 if (endpoint->tx_proc_cnt > 1) { 862 endpoint->tx_proc_cnt--; 863 spin_unlock_bh(&target->tx_lock); 864 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx busy\n"); 865 return; 866 } 867 868 /* 869 * drain the endpoint TX queue for transmission as long 870 * as we have enough credits. 871 */ 872 INIT_LIST_HEAD(&txq); 873 874 if ((HTC_CTRL_RSVD_SVC != endpoint->svc_id) && 875 (WMI_CONTROL_SVC != endpoint->svc_id)) 876 ac = target->dev->ar->ep2ac_map[endpoint->eid]; 877 878 while (true) { 879 880 if (list_empty(&endpoint->txq)) 881 break; 882 883 ath6kl_htc_tx_pkts_get(target, endpoint, &txq); 884 885 if (list_empty(&txq)) 886 break; 887 888 spin_unlock_bh(&target->tx_lock); 889 890 bundle_sent = 0; 891 n_pkts_bundle = 0; 892 893 while (true) { 894 /* try to send a bundle on each pass */ 895 if ((target->tx_bndl_mask) && 896 (get_queue_depth(&txq) >= 897 HTC_MIN_HTC_MSGS_TO_BUNDLE)) { 898 int temp1 = 0, temp2 = 0; 899 900 /* check if bundling is enabled for an AC */ 901 if (target->tx_bndl_mask & (1 << ac)) { 902 ath6kl_htc_tx_bundle(endpoint, &txq, 903 &temp1, &temp2); 904 bundle_sent += temp1; 905 n_pkts_bundle += temp2; 906 } 907 } 908 909 if (list_empty(&txq)) 910 break; 911 912 packet = list_first_entry(&txq, struct htc_packet, 913 list); 914 list_del(&packet->list); 915 916 ath6kl_htc_tx_prep_pkt(packet, packet->info.tx.flags, 917 0, packet->info.tx.seqno); 918 ath6kl_htc_tx_issue(target, packet); 919 } 920 921 spin_lock_bh(&target->tx_lock); 922 923 endpoint->ep_st.tx_bundles += bundle_sent; 924 endpoint->ep_st.tx_pkt_bundled += n_pkts_bundle; 925 926 /* 927 * if an AC has bundling disabled and no tx bundling 928 * has occured continously for a certain number of TX, 929 * enable tx bundling for this AC 930 */ 931 if (!bundle_sent) { 932 if (!(target->tx_bndl_mask & (1 << ac)) && 933 (ac < WMM_NUM_AC)) { 934 if (++target->ac_tx_count[ac] >= 935 TX_RESUME_BUNDLE_THRESHOLD) { 936 target->ac_tx_count[ac] = 0; 937 target->tx_bndl_mask |= (1 << ac); 938 } 939 } 940 } else { 941 /* tx bundling will reset the counter */ 942 if (ac < WMM_NUM_AC) 943 target->ac_tx_count[ac] = 0; 944 } 945 } 946 947 endpoint->tx_proc_cnt = 0; 948 spin_unlock_bh(&target->tx_lock); 949 } 950 951 static bool ath6kl_htc_tx_try(struct htc_target *target, 952 struct htc_endpoint *endpoint, 953 struct htc_packet *tx_pkt) 954 { 955 struct htc_ep_callbacks ep_cb; 956 int txq_depth; 957 bool overflow = false; 958 959 ep_cb = endpoint->ep_cb; 960 961 spin_lock_bh(&target->tx_lock); 962 txq_depth = get_queue_depth(&endpoint->txq); 963 spin_unlock_bh(&target->tx_lock); 964 965 if (txq_depth >= endpoint->max_txq_depth) 966 overflow = true; 967 968 if (overflow) 969 ath6kl_dbg(ATH6KL_DBG_HTC, 970 "htc tx overflow ep %d depth %d max %d\n", 971 endpoint->eid, txq_depth, 972 endpoint->max_txq_depth); 973 974 if (overflow && ep_cb.tx_full) { 975 if (ep_cb.tx_full(endpoint->target, tx_pkt) == 976 HTC_SEND_FULL_DROP) { 977 endpoint->ep_st.tx_dropped += 1; 978 return false; 979 } 980 } 981 982 spin_lock_bh(&target->tx_lock); 983 list_add_tail(&tx_pkt->list, &endpoint->txq); 984 spin_unlock_bh(&target->tx_lock); 985 986 ath6kl_htc_tx_from_queue(target, endpoint); 987 988 return true; 989 } 990 991 static void htc_chk_ep_txq(struct htc_target *target) 992 { 993 struct htc_endpoint *endpoint; 994 struct htc_endpoint_credit_dist *cred_dist; 995 996 /* 997 * Run through the credit distribution list to see if there are 998 * packets queued. NOTE: no locks need to be taken since the 999 * distribution list is not dynamic (cannot be re-ordered) and we 1000 * are not modifying any state. 1001 */ 1002 list_for_each_entry(cred_dist, &target->cred_dist_list, list) { 1003 endpoint = cred_dist->htc_ep; 1004 1005 spin_lock_bh(&target->tx_lock); 1006 if (!list_empty(&endpoint->txq)) { 1007 ath6kl_dbg(ATH6KL_DBG_HTC, 1008 "htc creds ep %d credits %d pkts %d\n", 1009 cred_dist->endpoint, 1010 endpoint->cred_dist.credits, 1011 get_queue_depth(&endpoint->txq)); 1012 spin_unlock_bh(&target->tx_lock); 1013 /* 1014 * Try to start the stalled queue, this list is 1015 * ordered by priority. If there are credits 1016 * available the highest priority queue will get a 1017 * chance to reclaim credits from lower priority 1018 * ones. 1019 */ 1020 ath6kl_htc_tx_from_queue(target, endpoint); 1021 spin_lock_bh(&target->tx_lock); 1022 } 1023 spin_unlock_bh(&target->tx_lock); 1024 } 1025 } 1026 1027 static int htc_setup_tx_complete(struct htc_target *target) 1028 { 1029 struct htc_packet *send_pkt = NULL; 1030 int status; 1031 1032 send_pkt = htc_get_control_buf(target, true); 1033 1034 if (!send_pkt) 1035 return -ENOMEM; 1036 1037 if (target->htc_tgt_ver >= HTC_VERSION_2P1) { 1038 struct htc_setup_comp_ext_msg *setup_comp_ext; 1039 u32 flags = 0; 1040 1041 setup_comp_ext = 1042 (struct htc_setup_comp_ext_msg *)send_pkt->buf; 1043 memset(setup_comp_ext, 0, sizeof(*setup_comp_ext)); 1044 setup_comp_ext->msg_id = 1045 cpu_to_le16(HTC_MSG_SETUP_COMPLETE_EX_ID); 1046 1047 if (target->msg_per_bndl_max > 0) { 1048 /* Indicate HTC bundling to the target */ 1049 flags |= HTC_SETUP_COMP_FLG_RX_BNDL_EN; 1050 setup_comp_ext->msg_per_rxbndl = 1051 target->msg_per_bndl_max; 1052 } 1053 1054 memcpy(&setup_comp_ext->flags, &flags, 1055 sizeof(setup_comp_ext->flags)); 1056 set_htc_pkt_info(send_pkt, NULL, (u8 *) setup_comp_ext, 1057 sizeof(struct htc_setup_comp_ext_msg), 1058 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG); 1059 1060 } else { 1061 struct htc_setup_comp_msg *setup_comp; 1062 setup_comp = (struct htc_setup_comp_msg *)send_pkt->buf; 1063 memset(setup_comp, 0, sizeof(struct htc_setup_comp_msg)); 1064 setup_comp->msg_id = cpu_to_le16(HTC_MSG_SETUP_COMPLETE_ID); 1065 set_htc_pkt_info(send_pkt, NULL, (u8 *) setup_comp, 1066 sizeof(struct htc_setup_comp_msg), 1067 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG); 1068 } 1069 1070 /* we want synchronous operation */ 1071 send_pkt->completion = NULL; 1072 ath6kl_htc_tx_prep_pkt(send_pkt, 0, 0, 0); 1073 status = ath6kl_htc_tx_issue(target, send_pkt); 1074 1075 if (send_pkt != NULL) 1076 htc_reclaim_txctrl_buf(target, send_pkt); 1077 1078 return status; 1079 } 1080 1081 static void ath6kl_htc_set_credit_dist(struct htc_target *target, 1082 struct ath6kl_htc_credit_info *credit_info, 1083 u16 srvc_pri_order[], int list_len) 1084 { 1085 struct htc_endpoint *endpoint; 1086 int i, ep; 1087 1088 target->credit_info = credit_info; 1089 1090 list_add_tail(&target->endpoint[ENDPOINT_0].cred_dist.list, 1091 &target->cred_dist_list); 1092 1093 for (i = 0; i < list_len; i++) { 1094 for (ep = ENDPOINT_1; ep < ENDPOINT_MAX; ep++) { 1095 endpoint = &target->endpoint[ep]; 1096 if (endpoint->svc_id == srvc_pri_order[i]) { 1097 list_add_tail(&endpoint->cred_dist.list, 1098 &target->cred_dist_list); 1099 break; 1100 } 1101 } 1102 if (ep >= ENDPOINT_MAX) { 1103 WARN_ON(1); 1104 return; 1105 } 1106 } 1107 } 1108 1109 static int ath6kl_htc_mbox_tx(struct htc_target *target, 1110 struct htc_packet *packet) 1111 { 1112 struct htc_endpoint *endpoint; 1113 struct list_head queue; 1114 1115 ath6kl_dbg(ATH6KL_DBG_HTC, 1116 "htc tx ep id %d buf 0x%p len %d\n", 1117 packet->endpoint, packet->buf, packet->act_len); 1118 1119 if (packet->endpoint >= ENDPOINT_MAX) { 1120 WARN_ON(1); 1121 return -EINVAL; 1122 } 1123 1124 endpoint = &target->endpoint[packet->endpoint]; 1125 1126 if (!ath6kl_htc_tx_try(target, endpoint, packet)) { 1127 packet->status = (target->htc_flags & HTC_OP_STATE_STOPPING) ? 1128 -ECANCELED : -ENOSPC; 1129 INIT_LIST_HEAD(&queue); 1130 list_add(&packet->list, &queue); 1131 htc_tx_complete(endpoint, &queue); 1132 } 1133 1134 return 0; 1135 } 1136 1137 /* flush endpoint TX queue */ 1138 static void ath6kl_htc_mbox_flush_txep(struct htc_target *target, 1139 enum htc_endpoint_id eid, u16 tag) 1140 { 1141 struct htc_packet *packet, *tmp_pkt; 1142 struct list_head discard_q, container; 1143 struct htc_endpoint *endpoint = &target->endpoint[eid]; 1144 1145 if (!endpoint->svc_id) { 1146 WARN_ON(1); 1147 return; 1148 } 1149 1150 /* initialize the discard queue */ 1151 INIT_LIST_HEAD(&discard_q); 1152 1153 spin_lock_bh(&target->tx_lock); 1154 1155 list_for_each_entry_safe(packet, tmp_pkt, &endpoint->txq, list) { 1156 if ((tag == HTC_TX_PACKET_TAG_ALL) || 1157 (tag == packet->info.tx.tag)) 1158 list_move_tail(&packet->list, &discard_q); 1159 } 1160 1161 spin_unlock_bh(&target->tx_lock); 1162 1163 list_for_each_entry_safe(packet, tmp_pkt, &discard_q, list) { 1164 packet->status = -ECANCELED; 1165 list_del(&packet->list); 1166 ath6kl_dbg(ATH6KL_DBG_HTC, 1167 "htc tx flushing pkt 0x%p len %d ep %d tag 0x%x\n", 1168 packet, packet->act_len, 1169 packet->endpoint, packet->info.tx.tag); 1170 1171 INIT_LIST_HEAD(&container); 1172 list_add_tail(&packet->list, &container); 1173 htc_tx_complete(endpoint, &container); 1174 } 1175 1176 } 1177 1178 static void ath6kl_htc_flush_txep_all(struct htc_target *target) 1179 { 1180 struct htc_endpoint *endpoint; 1181 int i; 1182 1183 dump_cred_dist_stats(target); 1184 1185 for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) { 1186 endpoint = &target->endpoint[i]; 1187 if (endpoint->svc_id == 0) 1188 /* not in use.. */ 1189 continue; 1190 ath6kl_htc_mbox_flush_txep(target, i, HTC_TX_PACKET_TAG_ALL); 1191 } 1192 } 1193 1194 static void ath6kl_htc_mbox_activity_changed(struct htc_target *target, 1195 enum htc_endpoint_id eid, 1196 bool active) 1197 { 1198 struct htc_endpoint *endpoint = &target->endpoint[eid]; 1199 bool dist = false; 1200 1201 if (endpoint->svc_id == 0) { 1202 WARN_ON(1); 1203 return; 1204 } 1205 1206 spin_lock_bh(&target->tx_lock); 1207 1208 if (active) { 1209 if (!(endpoint->cred_dist.dist_flags & HTC_EP_ACTIVE)) { 1210 endpoint->cred_dist.dist_flags |= HTC_EP_ACTIVE; 1211 dist = true; 1212 } 1213 } else { 1214 if (endpoint->cred_dist.dist_flags & HTC_EP_ACTIVE) { 1215 endpoint->cred_dist.dist_flags &= ~HTC_EP_ACTIVE; 1216 dist = true; 1217 } 1218 } 1219 1220 if (dist) { 1221 endpoint->cred_dist.txq_depth = 1222 get_queue_depth(&endpoint->txq); 1223 1224 ath6kl_dbg(ATH6KL_DBG_HTC, 1225 "htc tx activity ctxt 0x%p dist 0x%p\n", 1226 target->credit_info, &target->cred_dist_list); 1227 1228 ath6kl_credit_distribute(target->credit_info, 1229 &target->cred_dist_list, 1230 HTC_CREDIT_DIST_ACTIVITY_CHANGE); 1231 } 1232 1233 spin_unlock_bh(&target->tx_lock); 1234 1235 if (dist && !active) 1236 htc_chk_ep_txq(target); 1237 } 1238 1239 /* HTC Rx */ 1240 1241 static inline void ath6kl_htc_rx_update_stats(struct htc_endpoint *endpoint, 1242 int n_look_ahds) 1243 { 1244 endpoint->ep_st.rx_pkts++; 1245 if (n_look_ahds == 1) 1246 endpoint->ep_st.rx_lkahds++; 1247 else if (n_look_ahds > 1) 1248 endpoint->ep_st.rx_bundle_lkahd++; 1249 } 1250 1251 static inline bool htc_valid_rx_frame_len(struct htc_target *target, 1252 enum htc_endpoint_id eid, int len) 1253 { 1254 return (eid == target->dev->ar->ctrl_ep) ? 1255 len <= ATH6KL_BUFFER_SIZE : len <= ATH6KL_AMSDU_BUFFER_SIZE; 1256 } 1257 1258 static int htc_add_rxbuf(struct htc_target *target, struct htc_packet *packet) 1259 { 1260 struct list_head queue; 1261 1262 INIT_LIST_HEAD(&queue); 1263 list_add_tail(&packet->list, &queue); 1264 return ath6kl_htc_mbox_add_rxbuf_multiple(target, &queue); 1265 } 1266 1267 static void htc_reclaim_rxbuf(struct htc_target *target, 1268 struct htc_packet *packet, 1269 struct htc_endpoint *ep) 1270 { 1271 if (packet->info.rx.rx_flags & HTC_RX_PKT_NO_RECYCLE) { 1272 htc_rxpkt_reset(packet); 1273 packet->status = -ECANCELED; 1274 ep->ep_cb.rx(ep->target, packet); 1275 } else { 1276 htc_rxpkt_reset(packet); 1277 htc_add_rxbuf((void *)(target), packet); 1278 } 1279 } 1280 1281 static void reclaim_rx_ctrl_buf(struct htc_target *target, 1282 struct htc_packet *packet) 1283 { 1284 spin_lock_bh(&target->htc_lock); 1285 list_add_tail(&packet->list, &target->free_ctrl_rxbuf); 1286 spin_unlock_bh(&target->htc_lock); 1287 } 1288 1289 static int ath6kl_htc_rx_packet(struct htc_target *target, 1290 struct htc_packet *packet, 1291 u32 rx_len) 1292 { 1293 struct ath6kl_device *dev = target->dev; 1294 u32 padded_len; 1295 int status; 1296 1297 padded_len = CALC_TXRX_PADDED_LEN(target, rx_len); 1298 1299 if (padded_len > packet->buf_len) { 1300 ath6kl_err("not enough receive space for packet - padlen %d recvlen %d bufferlen %d\n", 1301 padded_len, rx_len, packet->buf_len); 1302 return -ENOMEM; 1303 } 1304 1305 ath6kl_dbg(ATH6KL_DBG_HTC, 1306 "htc rx 0x%p hdr x%x len %d mbox 0x%x\n", 1307 packet, packet->info.rx.exp_hdr, 1308 padded_len, dev->ar->mbox_info.htc_addr); 1309 1310 status = hif_read_write_sync(dev->ar, 1311 dev->ar->mbox_info.htc_addr, 1312 packet->buf, padded_len, 1313 HIF_RD_SYNC_BLOCK_FIX); 1314 1315 packet->status = status; 1316 1317 return status; 1318 } 1319 1320 /* 1321 * optimization for recv packets, we can indicate a 1322 * "hint" that there are more single-packets to fetch 1323 * on this endpoint. 1324 */ 1325 static void ath6kl_htc_rx_set_indicate(u32 lk_ahd, 1326 struct htc_endpoint *endpoint, 1327 struct htc_packet *packet) 1328 { 1329 struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)&lk_ahd; 1330 1331 if (htc_hdr->eid == packet->endpoint) { 1332 if (!list_empty(&endpoint->rx_bufq)) 1333 packet->info.rx.indicat_flags |= 1334 HTC_RX_FLAGS_INDICATE_MORE_PKTS; 1335 } 1336 } 1337 1338 static void ath6kl_htc_rx_chk_water_mark(struct htc_endpoint *endpoint) 1339 { 1340 struct htc_ep_callbacks ep_cb = endpoint->ep_cb; 1341 1342 if (ep_cb.rx_refill_thresh > 0) { 1343 spin_lock_bh(&endpoint->target->rx_lock); 1344 if (get_queue_depth(&endpoint->rx_bufq) 1345 < ep_cb.rx_refill_thresh) { 1346 spin_unlock_bh(&endpoint->target->rx_lock); 1347 ep_cb.rx_refill(endpoint->target, endpoint->eid); 1348 return; 1349 } 1350 spin_unlock_bh(&endpoint->target->rx_lock); 1351 } 1352 } 1353 1354 /* This function is called with rx_lock held */ 1355 static int ath6kl_htc_rx_setup(struct htc_target *target, 1356 struct htc_endpoint *ep, 1357 u32 *lk_ahds, struct list_head *queue, int n_msg) 1358 { 1359 struct htc_packet *packet; 1360 /* FIXME: type of lk_ahds can't be right */ 1361 struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)lk_ahds; 1362 struct htc_ep_callbacks ep_cb; 1363 int status = 0, j, full_len; 1364 bool no_recycle; 1365 1366 full_len = CALC_TXRX_PADDED_LEN(target, 1367 le16_to_cpu(htc_hdr->payld_len) + 1368 sizeof(*htc_hdr)); 1369 1370 if (!htc_valid_rx_frame_len(target, ep->eid, full_len)) { 1371 ath6kl_warn("Rx buffer requested with invalid length htc_hdr:eid %d, flags 0x%x, len %d\n", 1372 htc_hdr->eid, htc_hdr->flags, 1373 le16_to_cpu(htc_hdr->payld_len)); 1374 return -EINVAL; 1375 } 1376 1377 ep_cb = ep->ep_cb; 1378 for (j = 0; j < n_msg; j++) { 1379 1380 /* 1381 * Reset flag, any packets allocated using the 1382 * rx_alloc() API cannot be recycled on 1383 * cleanup,they must be explicitly returned. 1384 */ 1385 no_recycle = false; 1386 1387 if (ep_cb.rx_allocthresh && 1388 (full_len > ep_cb.rx_alloc_thresh)) { 1389 ep->ep_st.rx_alloc_thresh_hit += 1; 1390 ep->ep_st.rxalloc_thresh_byte += 1391 le16_to_cpu(htc_hdr->payld_len); 1392 1393 spin_unlock_bh(&target->rx_lock); 1394 no_recycle = true; 1395 1396 packet = ep_cb.rx_allocthresh(ep->target, ep->eid, 1397 full_len); 1398 spin_lock_bh(&target->rx_lock); 1399 } else { 1400 /* refill handler is being used */ 1401 if (list_empty(&ep->rx_bufq)) { 1402 if (ep_cb.rx_refill) { 1403 spin_unlock_bh(&target->rx_lock); 1404 ep_cb.rx_refill(ep->target, ep->eid); 1405 spin_lock_bh(&target->rx_lock); 1406 } 1407 } 1408 1409 if (list_empty(&ep->rx_bufq)) 1410 packet = NULL; 1411 else { 1412 packet = list_first_entry(&ep->rx_bufq, 1413 struct htc_packet, list); 1414 list_del(&packet->list); 1415 } 1416 } 1417 1418 if (!packet) { 1419 target->rx_st_flags |= HTC_RECV_WAIT_BUFFERS; 1420 target->ep_waiting = ep->eid; 1421 return -ENOSPC; 1422 } 1423 1424 /* clear flags */ 1425 packet->info.rx.rx_flags = 0; 1426 packet->info.rx.indicat_flags = 0; 1427 packet->status = 0; 1428 1429 if (no_recycle) 1430 /* 1431 * flag that these packets cannot be 1432 * recycled, they have to be returned to 1433 * the user 1434 */ 1435 packet->info.rx.rx_flags |= HTC_RX_PKT_NO_RECYCLE; 1436 1437 /* Caller needs to free this upon any failure */ 1438 list_add_tail(&packet->list, queue); 1439 1440 if (target->htc_flags & HTC_OP_STATE_STOPPING) { 1441 status = -ECANCELED; 1442 break; 1443 } 1444 1445 if (j) { 1446 packet->info.rx.rx_flags |= HTC_RX_PKT_REFRESH_HDR; 1447 packet->info.rx.exp_hdr = 0xFFFFFFFF; 1448 } else 1449 /* set expected look ahead */ 1450 packet->info.rx.exp_hdr = *lk_ahds; 1451 1452 packet->act_len = le16_to_cpu(htc_hdr->payld_len) + 1453 HTC_HDR_LENGTH; 1454 } 1455 1456 return status; 1457 } 1458 1459 static int ath6kl_htc_rx_alloc(struct htc_target *target, 1460 u32 lk_ahds[], int msg, 1461 struct htc_endpoint *endpoint, 1462 struct list_head *queue) 1463 { 1464 int status = 0; 1465 struct htc_packet *packet, *tmp_pkt; 1466 struct htc_frame_hdr *htc_hdr; 1467 int i, n_msg; 1468 1469 spin_lock_bh(&target->rx_lock); 1470 1471 for (i = 0; i < msg; i++) { 1472 1473 htc_hdr = (struct htc_frame_hdr *)&lk_ahds[i]; 1474 1475 if (htc_hdr->eid >= ENDPOINT_MAX) { 1476 ath6kl_err("invalid ep in look-ahead: %d\n", 1477 htc_hdr->eid); 1478 status = -ENOMEM; 1479 break; 1480 } 1481 1482 if (htc_hdr->eid != endpoint->eid) { 1483 ath6kl_err("invalid ep in look-ahead: %d should be : %d (index:%d)\n", 1484 htc_hdr->eid, endpoint->eid, i); 1485 status = -ENOMEM; 1486 break; 1487 } 1488 1489 if (le16_to_cpu(htc_hdr->payld_len) > HTC_MAX_PAYLOAD_LENGTH) { 1490 ath6kl_err("payload len %d exceeds max htc : %d !\n", 1491 htc_hdr->payld_len, 1492 (u32) HTC_MAX_PAYLOAD_LENGTH); 1493 status = -ENOMEM; 1494 break; 1495 } 1496 1497 if (endpoint->svc_id == 0) { 1498 ath6kl_err("ep %d is not connected !\n", htc_hdr->eid); 1499 status = -ENOMEM; 1500 break; 1501 } 1502 1503 if (htc_hdr->flags & HTC_FLG_RX_BNDL_CNT) { 1504 /* 1505 * HTC header indicates that every packet to follow 1506 * has the same padded length so that it can be 1507 * optimally fetched as a full bundle. 1508 */ 1509 n_msg = (htc_hdr->flags & HTC_FLG_RX_BNDL_CNT) >> 1510 HTC_FLG_RX_BNDL_CNT_S; 1511 1512 /* the count doesn't include the starter frame */ 1513 n_msg++; 1514 if (n_msg > target->msg_per_bndl_max) { 1515 status = -ENOMEM; 1516 break; 1517 } 1518 1519 endpoint->ep_st.rx_bundle_from_hdr += 1; 1520 ath6kl_dbg(ATH6KL_DBG_HTC, 1521 "htc rx bundle pkts %d\n", 1522 n_msg); 1523 } else 1524 /* HTC header only indicates 1 message to fetch */ 1525 n_msg = 1; 1526 1527 /* Setup packet buffers for each message */ 1528 status = ath6kl_htc_rx_setup(target, endpoint, &lk_ahds[i], 1529 queue, n_msg); 1530 1531 /* 1532 * This is due to unavailabilty of buffers to rx entire data. 1533 * Return no error so that free buffers from queue can be used 1534 * to receive partial data. 1535 */ 1536 if (status == -ENOSPC) { 1537 spin_unlock_bh(&target->rx_lock); 1538 return 0; 1539 } 1540 1541 if (status) 1542 break; 1543 } 1544 1545 spin_unlock_bh(&target->rx_lock); 1546 1547 if (status) { 1548 list_for_each_entry_safe(packet, tmp_pkt, queue, list) { 1549 list_del(&packet->list); 1550 htc_reclaim_rxbuf(target, packet, 1551 &target->endpoint[packet->endpoint]); 1552 } 1553 } 1554 1555 return status; 1556 } 1557 1558 static void htc_ctrl_rx(struct htc_target *context, struct htc_packet *packets) 1559 { 1560 if (packets->endpoint != ENDPOINT_0) { 1561 WARN_ON(1); 1562 return; 1563 } 1564 1565 if (packets->status == -ECANCELED) { 1566 reclaim_rx_ctrl_buf(context, packets); 1567 return; 1568 } 1569 1570 if (packets->act_len > 0) { 1571 ath6kl_err("htc_ctrl_rx, got message with len:%zu\n", 1572 packets->act_len + HTC_HDR_LENGTH); 1573 1574 ath6kl_dbg_dump(ATH6KL_DBG_HTC, 1575 "htc rx unexpected endpoint 0 message", "", 1576 packets->buf - HTC_HDR_LENGTH, 1577 packets->act_len + HTC_HDR_LENGTH); 1578 } 1579 1580 htc_reclaim_rxbuf(context, packets, &context->endpoint[0]); 1581 } 1582 1583 static void htc_proc_cred_rpt(struct htc_target *target, 1584 struct htc_credit_report *rpt, 1585 int n_entries, 1586 enum htc_endpoint_id from_ep) 1587 { 1588 struct htc_endpoint *endpoint; 1589 int tot_credits = 0, i; 1590 bool dist = false; 1591 1592 spin_lock_bh(&target->tx_lock); 1593 1594 for (i = 0; i < n_entries; i++, rpt++) { 1595 if (rpt->eid >= ENDPOINT_MAX) { 1596 WARN_ON(1); 1597 spin_unlock_bh(&target->tx_lock); 1598 return; 1599 } 1600 1601 endpoint = &target->endpoint[rpt->eid]; 1602 1603 ath6kl_dbg(ATH6KL_DBG_CREDIT, 1604 "credit report ep %d credits %d\n", 1605 rpt->eid, rpt->credits); 1606 1607 endpoint->ep_st.tx_cred_rpt += 1; 1608 endpoint->ep_st.cred_retnd += rpt->credits; 1609 1610 if (from_ep == rpt->eid) { 1611 /* 1612 * This credit report arrived on the same endpoint 1613 * indicating it arrived in an RX packet. 1614 */ 1615 endpoint->ep_st.cred_from_rx += rpt->credits; 1616 endpoint->ep_st.cred_rpt_from_rx += 1; 1617 } else if (from_ep == ENDPOINT_0) { 1618 /* credit arrived on endpoint 0 as a NULL message */ 1619 endpoint->ep_st.cred_from_ep0 += rpt->credits; 1620 endpoint->ep_st.cred_rpt_ep0 += 1; 1621 } else { 1622 endpoint->ep_st.cred_from_other += rpt->credits; 1623 endpoint->ep_st.cred_rpt_from_other += 1; 1624 } 1625 1626 if (rpt->eid == ENDPOINT_0) 1627 /* always give endpoint 0 credits back */ 1628 endpoint->cred_dist.credits += rpt->credits; 1629 else { 1630 endpoint->cred_dist.cred_to_dist += rpt->credits; 1631 dist = true; 1632 } 1633 1634 /* 1635 * Refresh tx depth for distribution function that will 1636 * recover these credits NOTE: this is only valid when 1637 * there are credits to recover! 1638 */ 1639 endpoint->cred_dist.txq_depth = 1640 get_queue_depth(&endpoint->txq); 1641 1642 tot_credits += rpt->credits; 1643 } 1644 1645 if (dist) { 1646 /* 1647 * This was a credit return based on a completed send 1648 * operations note, this is done with the lock held 1649 */ 1650 ath6kl_credit_distribute(target->credit_info, 1651 &target->cred_dist_list, 1652 HTC_CREDIT_DIST_SEND_COMPLETE); 1653 } 1654 1655 spin_unlock_bh(&target->tx_lock); 1656 1657 if (tot_credits) 1658 htc_chk_ep_txq(target); 1659 } 1660 1661 static int htc_parse_trailer(struct htc_target *target, 1662 struct htc_record_hdr *record, 1663 u8 *record_buf, u32 *next_lk_ahds, 1664 enum htc_endpoint_id endpoint, 1665 int *n_lk_ahds) 1666 { 1667 struct htc_bundle_lkahd_rpt *bundle_lkahd_rpt; 1668 struct htc_lookahead_report *lk_ahd; 1669 int len; 1670 1671 switch (record->rec_id) { 1672 case HTC_RECORD_CREDITS: 1673 len = record->len / sizeof(struct htc_credit_report); 1674 if (!len) { 1675 WARN_ON(1); 1676 return -EINVAL; 1677 } 1678 1679 htc_proc_cred_rpt(target, 1680 (struct htc_credit_report *) record_buf, 1681 len, endpoint); 1682 break; 1683 case HTC_RECORD_LOOKAHEAD: 1684 len = record->len / sizeof(*lk_ahd); 1685 if (!len) { 1686 WARN_ON(1); 1687 return -EINVAL; 1688 } 1689 1690 lk_ahd = (struct htc_lookahead_report *) record_buf; 1691 if ((lk_ahd->pre_valid == ((~lk_ahd->post_valid) & 0xFF)) && 1692 next_lk_ahds) { 1693 1694 ath6kl_dbg(ATH6KL_DBG_HTC, 1695 "htc rx lk_ahd found pre_valid 0x%x post_valid 0x%x\n", 1696 lk_ahd->pre_valid, lk_ahd->post_valid); 1697 1698 /* look ahead bytes are valid, copy them over */ 1699 memcpy((u8 *)&next_lk_ahds[0], lk_ahd->lk_ahd, 4); 1700 1701 ath6kl_dbg_dump(ATH6KL_DBG_HTC, 1702 "htc rx next look ahead", 1703 "", next_lk_ahds, 4); 1704 1705 *n_lk_ahds = 1; 1706 } 1707 break; 1708 case HTC_RECORD_LOOKAHEAD_BUNDLE: 1709 len = record->len / sizeof(*bundle_lkahd_rpt); 1710 if (!len || (len > HTC_HOST_MAX_MSG_PER_BUNDLE)) { 1711 WARN_ON(1); 1712 return -EINVAL; 1713 } 1714 1715 if (next_lk_ahds) { 1716 int i; 1717 1718 bundle_lkahd_rpt = 1719 (struct htc_bundle_lkahd_rpt *) record_buf; 1720 1721 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bundle lk_ahd", 1722 "", record_buf, record->len); 1723 1724 for (i = 0; i < len; i++) { 1725 memcpy((u8 *)&next_lk_ahds[i], 1726 bundle_lkahd_rpt->lk_ahd, 4); 1727 bundle_lkahd_rpt++; 1728 } 1729 1730 *n_lk_ahds = i; 1731 } 1732 break; 1733 default: 1734 ath6kl_err("unhandled record: id:%d len:%d\n", 1735 record->rec_id, record->len); 1736 break; 1737 } 1738 1739 return 0; 1740 1741 } 1742 1743 static int htc_proc_trailer(struct htc_target *target, 1744 u8 *buf, int len, u32 *next_lk_ahds, 1745 int *n_lk_ahds, enum htc_endpoint_id endpoint) 1746 { 1747 struct htc_record_hdr *record; 1748 int orig_len; 1749 int status; 1750 u8 *record_buf; 1751 u8 *orig_buf; 1752 1753 ath6kl_dbg(ATH6KL_DBG_HTC, "htc rx trailer len %d\n", len); 1754 ath6kl_dbg_dump(ATH6KL_DBG_HTC, NULL, "", buf, len); 1755 1756 orig_buf = buf; 1757 orig_len = len; 1758 status = 0; 1759 1760 while (len > 0) { 1761 1762 if (len < sizeof(struct htc_record_hdr)) { 1763 status = -ENOMEM; 1764 break; 1765 } 1766 /* these are byte aligned structs */ 1767 record = (struct htc_record_hdr *) buf; 1768 len -= sizeof(struct htc_record_hdr); 1769 buf += sizeof(struct htc_record_hdr); 1770 1771 if (record->len > len) { 1772 ath6kl_err("invalid record len: %d (id:%d) buf has: %d bytes left\n", 1773 record->len, record->rec_id, len); 1774 status = -ENOMEM; 1775 break; 1776 } 1777 record_buf = buf; 1778 1779 status = htc_parse_trailer(target, record, record_buf, 1780 next_lk_ahds, endpoint, n_lk_ahds); 1781 1782 if (status) 1783 break; 1784 1785 /* advance buffer past this record for next time around */ 1786 buf += record->len; 1787 len -= record->len; 1788 } 1789 1790 if (status) 1791 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bad trailer", 1792 "", orig_buf, orig_len); 1793 1794 return status; 1795 } 1796 1797 static int ath6kl_htc_rx_process_hdr(struct htc_target *target, 1798 struct htc_packet *packet, 1799 u32 *next_lkahds, int *n_lkahds) 1800 { 1801 int status = 0; 1802 u16 payload_len; 1803 u32 lk_ahd; 1804 struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)packet->buf; 1805 1806 if (n_lkahds != NULL) 1807 *n_lkahds = 0; 1808 1809 /* 1810 * NOTE: we cannot assume the alignment of buf, so we use the safe 1811 * macros to retrieve 16 bit fields. 1812 */ 1813 payload_len = le16_to_cpu(get_unaligned(&htc_hdr->payld_len)); 1814 1815 memcpy((u8 *)&lk_ahd, packet->buf, sizeof(lk_ahd)); 1816 1817 if (packet->info.rx.rx_flags & HTC_RX_PKT_REFRESH_HDR) { 1818 /* 1819 * Refresh the expected header and the actual length as it 1820 * was unknown when this packet was grabbed as part of the 1821 * bundle. 1822 */ 1823 packet->info.rx.exp_hdr = lk_ahd; 1824 packet->act_len = payload_len + HTC_HDR_LENGTH; 1825 1826 /* validate the actual header that was refreshed */ 1827 if (packet->act_len > packet->buf_len) { 1828 ath6kl_err("refreshed hdr payload len (%d) in bundled recv is invalid (hdr: 0x%X)\n", 1829 payload_len, lk_ahd); 1830 /* 1831 * Limit this to max buffer just to print out some 1832 * of the buffer. 1833 */ 1834 packet->act_len = min(packet->act_len, packet->buf_len); 1835 status = -ENOMEM; 1836 goto fail_rx; 1837 } 1838 1839 if (packet->endpoint != htc_hdr->eid) { 1840 ath6kl_err("refreshed hdr ep (%d) does not match expected ep (%d)\n", 1841 htc_hdr->eid, packet->endpoint); 1842 status = -ENOMEM; 1843 goto fail_rx; 1844 } 1845 } 1846 1847 if (lk_ahd != packet->info.rx.exp_hdr) { 1848 ath6kl_err("%s(): lk_ahd mismatch! (pPkt:0x%p flags:0x%X)\n", 1849 __func__, packet, packet->info.rx.rx_flags); 1850 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx expected lk_ahd", 1851 "", &packet->info.rx.exp_hdr, 4); 1852 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx current header", 1853 "", (u8 *)&lk_ahd, sizeof(lk_ahd)); 1854 status = -ENOMEM; 1855 goto fail_rx; 1856 } 1857 1858 if (htc_hdr->flags & HTC_FLG_RX_TRAILER) { 1859 if (htc_hdr->ctrl[0] < sizeof(struct htc_record_hdr) || 1860 htc_hdr->ctrl[0] > payload_len) { 1861 ath6kl_err("%s(): invalid hdr (payload len should be :%d, CB[0] is:%d)\n", 1862 __func__, payload_len, htc_hdr->ctrl[0]); 1863 status = -ENOMEM; 1864 goto fail_rx; 1865 } 1866 1867 if (packet->info.rx.rx_flags & HTC_RX_PKT_IGNORE_LOOKAHEAD) { 1868 next_lkahds = NULL; 1869 n_lkahds = NULL; 1870 } 1871 1872 status = htc_proc_trailer(target, packet->buf + HTC_HDR_LENGTH 1873 + payload_len - htc_hdr->ctrl[0], 1874 htc_hdr->ctrl[0], next_lkahds, 1875 n_lkahds, packet->endpoint); 1876 1877 if (status) 1878 goto fail_rx; 1879 1880 packet->act_len -= htc_hdr->ctrl[0]; 1881 } 1882 1883 packet->buf += HTC_HDR_LENGTH; 1884 packet->act_len -= HTC_HDR_LENGTH; 1885 1886 fail_rx: 1887 if (status) 1888 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bad packet", 1889 "", packet->buf, packet->act_len); 1890 1891 return status; 1892 } 1893 1894 static void ath6kl_htc_rx_complete(struct htc_endpoint *endpoint, 1895 struct htc_packet *packet) 1896 { 1897 ath6kl_dbg(ATH6KL_DBG_HTC, 1898 "htc rx complete ep %d packet 0x%p\n", 1899 endpoint->eid, packet); 1900 endpoint->ep_cb.rx(endpoint->target, packet); 1901 } 1902 1903 static int ath6kl_htc_rx_bundle(struct htc_target *target, 1904 struct list_head *rxq, 1905 struct list_head *sync_compq, 1906 int *n_pkt_fetched, bool part_bundle) 1907 { 1908 struct hif_scatter_req *scat_req; 1909 struct htc_packet *packet; 1910 int rem_space = target->max_rx_bndl_sz; 1911 int n_scat_pkt, status = 0, i, len; 1912 1913 n_scat_pkt = get_queue_depth(rxq); 1914 n_scat_pkt = min(n_scat_pkt, target->msg_per_bndl_max); 1915 1916 if ((get_queue_depth(rxq) - n_scat_pkt) > 0) { 1917 /* 1918 * We were forced to split this bundle receive operation 1919 * all packets in this partial bundle must have their 1920 * lookaheads ignored. 1921 */ 1922 part_bundle = true; 1923 1924 /* 1925 * This would only happen if the target ignored our max 1926 * bundle limit. 1927 */ 1928 ath6kl_warn("%s(): partial bundle detected num:%d , %d\n", 1929 __func__, get_queue_depth(rxq), n_scat_pkt); 1930 } 1931 1932 len = 0; 1933 1934 ath6kl_dbg(ATH6KL_DBG_HTC, 1935 "htc rx bundle depth %d pkts %d\n", 1936 get_queue_depth(rxq), n_scat_pkt); 1937 1938 scat_req = hif_scatter_req_get(target->dev->ar); 1939 1940 if (scat_req == NULL) 1941 goto fail_rx_pkt; 1942 1943 for (i = 0; i < n_scat_pkt; i++) { 1944 int pad_len; 1945 1946 packet = list_first_entry(rxq, struct htc_packet, list); 1947 list_del(&packet->list); 1948 1949 pad_len = CALC_TXRX_PADDED_LEN(target, 1950 packet->act_len); 1951 1952 if ((rem_space - pad_len) < 0) { 1953 list_add(&packet->list, rxq); 1954 break; 1955 } 1956 1957 rem_space -= pad_len; 1958 1959 if (part_bundle || (i < (n_scat_pkt - 1))) 1960 /* 1961 * Packet 0..n-1 cannot be checked for look-aheads 1962 * since we are fetching a bundle the last packet 1963 * however can have it's lookahead used 1964 */ 1965 packet->info.rx.rx_flags |= 1966 HTC_RX_PKT_IGNORE_LOOKAHEAD; 1967 1968 /* NOTE: 1 HTC packet per scatter entry */ 1969 scat_req->scat_list[i].buf = packet->buf; 1970 scat_req->scat_list[i].len = pad_len; 1971 1972 packet->info.rx.rx_flags |= HTC_RX_PKT_PART_OF_BUNDLE; 1973 1974 list_add_tail(&packet->list, sync_compq); 1975 1976 WARN_ON(!scat_req->scat_list[i].len); 1977 len += scat_req->scat_list[i].len; 1978 } 1979 1980 scat_req->len = len; 1981 scat_req->scat_entries = i; 1982 1983 status = ath6kl_hif_submit_scat_req(target->dev, scat_req, true); 1984 1985 if (!status) 1986 *n_pkt_fetched = i; 1987 1988 /* free scatter request */ 1989 hif_scatter_req_add(target->dev->ar, scat_req); 1990 1991 fail_rx_pkt: 1992 1993 return status; 1994 } 1995 1996 static int ath6kl_htc_rx_process_packets(struct htc_target *target, 1997 struct list_head *comp_pktq, 1998 u32 lk_ahds[], 1999 int *n_lk_ahd) 2000 { 2001 struct htc_packet *packet, *tmp_pkt; 2002 struct htc_endpoint *ep; 2003 int status = 0; 2004 2005 list_for_each_entry_safe(packet, tmp_pkt, comp_pktq, list) { 2006 ep = &target->endpoint[packet->endpoint]; 2007 2008 /* process header for each of the recv packet */ 2009 status = ath6kl_htc_rx_process_hdr(target, packet, lk_ahds, 2010 n_lk_ahd); 2011 if (status) 2012 return status; 2013 2014 list_del(&packet->list); 2015 2016 if (list_empty(comp_pktq)) { 2017 /* 2018 * Last packet's more packet flag is set 2019 * based on the lookahead. 2020 */ 2021 if (*n_lk_ahd > 0) 2022 ath6kl_htc_rx_set_indicate(lk_ahds[0], 2023 ep, packet); 2024 } else 2025 /* 2026 * Packets in a bundle automatically have 2027 * this flag set. 2028 */ 2029 packet->info.rx.indicat_flags |= 2030 HTC_RX_FLAGS_INDICATE_MORE_PKTS; 2031 2032 ath6kl_htc_rx_update_stats(ep, *n_lk_ahd); 2033 2034 if (packet->info.rx.rx_flags & HTC_RX_PKT_PART_OF_BUNDLE) 2035 ep->ep_st.rx_bundl += 1; 2036 2037 ath6kl_htc_rx_complete(ep, packet); 2038 } 2039 2040 return status; 2041 } 2042 2043 static int ath6kl_htc_rx_fetch(struct htc_target *target, 2044 struct list_head *rx_pktq, 2045 struct list_head *comp_pktq) 2046 { 2047 int fetched_pkts; 2048 bool part_bundle = false; 2049 int status = 0; 2050 struct list_head tmp_rxq; 2051 struct htc_packet *packet, *tmp_pkt; 2052 2053 /* now go fetch the list of HTC packets */ 2054 while (!list_empty(rx_pktq)) { 2055 fetched_pkts = 0; 2056 2057 INIT_LIST_HEAD(&tmp_rxq); 2058 2059 if (target->rx_bndl_enable && (get_queue_depth(rx_pktq) > 1)) { 2060 /* 2061 * There are enough packets to attempt a 2062 * bundle transfer and recv bundling is 2063 * allowed. 2064 */ 2065 status = ath6kl_htc_rx_bundle(target, rx_pktq, 2066 &tmp_rxq, 2067 &fetched_pkts, 2068 part_bundle); 2069 if (status) 2070 goto fail_rx; 2071 2072 if (!list_empty(rx_pktq)) 2073 part_bundle = true; 2074 2075 list_splice_tail_init(&tmp_rxq, comp_pktq); 2076 } 2077 2078 if (!fetched_pkts) { 2079 2080 packet = list_first_entry(rx_pktq, struct htc_packet, 2081 list); 2082 2083 /* fully synchronous */ 2084 packet->completion = NULL; 2085 2086 if (!list_is_singular(rx_pktq)) 2087 /* 2088 * look_aheads in all packet 2089 * except the last one in the 2090 * bundle must be ignored 2091 */ 2092 packet->info.rx.rx_flags |= 2093 HTC_RX_PKT_IGNORE_LOOKAHEAD; 2094 2095 /* go fetch the packet */ 2096 status = ath6kl_htc_rx_packet(target, packet, 2097 packet->act_len); 2098 2099 list_move_tail(&packet->list, &tmp_rxq); 2100 2101 if (status) 2102 goto fail_rx; 2103 2104 list_splice_tail_init(&tmp_rxq, comp_pktq); 2105 } 2106 } 2107 2108 return 0; 2109 2110 fail_rx: 2111 2112 /* 2113 * Cleanup any packets we allocated but didn't use to 2114 * actually fetch any packets. 2115 */ 2116 2117 list_for_each_entry_safe(packet, tmp_pkt, rx_pktq, list) { 2118 list_del(&packet->list); 2119 htc_reclaim_rxbuf(target, packet, 2120 &target->endpoint[packet->endpoint]); 2121 } 2122 2123 list_for_each_entry_safe(packet, tmp_pkt, &tmp_rxq, list) { 2124 list_del(&packet->list); 2125 htc_reclaim_rxbuf(target, packet, 2126 &target->endpoint[packet->endpoint]); 2127 } 2128 2129 return status; 2130 } 2131 2132 int ath6kl_htc_rxmsg_pending_handler(struct htc_target *target, 2133 u32 msg_look_ahead, int *num_pkts) 2134 { 2135 struct htc_packet *packets, *tmp_pkt; 2136 struct htc_endpoint *endpoint; 2137 struct list_head rx_pktq, comp_pktq; 2138 int status = 0; 2139 u32 look_aheads[HTC_HOST_MAX_MSG_PER_BUNDLE]; 2140 int num_look_ahead = 1; 2141 enum htc_endpoint_id id; 2142 int n_fetched = 0; 2143 2144 INIT_LIST_HEAD(&comp_pktq); 2145 *num_pkts = 0; 2146 2147 /* 2148 * On first entry copy the look_aheads into our temp array for 2149 * processing 2150 */ 2151 look_aheads[0] = msg_look_ahead; 2152 2153 while (true) { 2154 2155 /* 2156 * First lookahead sets the expected endpoint IDs for all 2157 * packets in a bundle. 2158 */ 2159 id = ((struct htc_frame_hdr *)&look_aheads[0])->eid; 2160 endpoint = &target->endpoint[id]; 2161 2162 if (id >= ENDPOINT_MAX) { 2163 ath6kl_err("MsgPend, invalid endpoint in look-ahead: %d\n", 2164 id); 2165 status = -ENOMEM; 2166 break; 2167 } 2168 2169 INIT_LIST_HEAD(&rx_pktq); 2170 INIT_LIST_HEAD(&comp_pktq); 2171 2172 /* 2173 * Try to allocate as many HTC RX packets indicated by the 2174 * look_aheads. 2175 */ 2176 status = ath6kl_htc_rx_alloc(target, look_aheads, 2177 num_look_ahead, endpoint, 2178 &rx_pktq); 2179 if (status) 2180 break; 2181 2182 if (get_queue_depth(&rx_pktq) >= 2) 2183 /* 2184 * A recv bundle was detected, force IRQ status 2185 * re-check again 2186 */ 2187 target->chk_irq_status_cnt = 1; 2188 2189 n_fetched += get_queue_depth(&rx_pktq); 2190 2191 num_look_ahead = 0; 2192 2193 status = ath6kl_htc_rx_fetch(target, &rx_pktq, &comp_pktq); 2194 2195 if (!status) 2196 ath6kl_htc_rx_chk_water_mark(endpoint); 2197 2198 /* Process fetched packets */ 2199 status = ath6kl_htc_rx_process_packets(target, &comp_pktq, 2200 look_aheads, 2201 &num_look_ahead); 2202 2203 if (!num_look_ahead || status) 2204 break; 2205 2206 /* 2207 * For SYNCH processing, if we get here, we are running 2208 * through the loop again due to a detected lookahead. Set 2209 * flag that we should re-check IRQ status registers again 2210 * before leaving IRQ processing, this can net better 2211 * performance in high throughput situations. 2212 */ 2213 target->chk_irq_status_cnt = 1; 2214 } 2215 2216 if (status) { 2217 ath6kl_err("failed to get pending recv messages: %d\n", 2218 status); 2219 2220 /* cleanup any packets in sync completion queue */ 2221 list_for_each_entry_safe(packets, tmp_pkt, &comp_pktq, list) { 2222 list_del(&packets->list); 2223 htc_reclaim_rxbuf(target, packets, 2224 &target->endpoint[packets->endpoint]); 2225 } 2226 2227 if (target->htc_flags & HTC_OP_STATE_STOPPING) { 2228 ath6kl_warn("host is going to stop blocking receiver for htc_stop\n"); 2229 ath6kl_hif_rx_control(target->dev, false); 2230 } 2231 } 2232 2233 /* 2234 * Before leaving, check to see if host ran out of buffers and 2235 * needs to stop the receiver. 2236 */ 2237 if (target->rx_st_flags & HTC_RECV_WAIT_BUFFERS) { 2238 ath6kl_warn("host has no rx buffers blocking receiver to prevent overrun\n"); 2239 ath6kl_hif_rx_control(target->dev, false); 2240 } 2241 *num_pkts = n_fetched; 2242 2243 return status; 2244 } 2245 2246 /* 2247 * Synchronously wait for a control message from the target, 2248 * This function is used at initialization time ONLY. At init messages 2249 * on ENDPOINT 0 are expected. 2250 */ 2251 static struct htc_packet *htc_wait_for_ctrl_msg(struct htc_target *target) 2252 { 2253 struct htc_packet *packet = NULL; 2254 struct htc_frame_hdr *htc_hdr; 2255 u32 look_ahead; 2256 2257 if (ath6kl_hif_poll_mboxmsg_rx(target->dev, &look_ahead, 2258 HTC_TARGET_RESPONSE_TIMEOUT)) 2259 return NULL; 2260 2261 ath6kl_dbg(ATH6KL_DBG_HTC, 2262 "htc rx wait ctrl look_ahead 0x%X\n", look_ahead); 2263 2264 htc_hdr = (struct htc_frame_hdr *)&look_ahead; 2265 2266 if (htc_hdr->eid != ENDPOINT_0) 2267 return NULL; 2268 2269 packet = htc_get_control_buf(target, false); 2270 2271 if (!packet) 2272 return NULL; 2273 2274 packet->info.rx.rx_flags = 0; 2275 packet->info.rx.exp_hdr = look_ahead; 2276 packet->act_len = le16_to_cpu(htc_hdr->payld_len) + HTC_HDR_LENGTH; 2277 2278 if (packet->act_len > packet->buf_len) 2279 goto fail_ctrl_rx; 2280 2281 /* we want synchronous operation */ 2282 packet->completion = NULL; 2283 2284 /* get the message from the device, this will block */ 2285 if (ath6kl_htc_rx_packet(target, packet, packet->act_len)) 2286 goto fail_ctrl_rx; 2287 2288 /* process receive header */ 2289 packet->status = ath6kl_htc_rx_process_hdr(target, packet, NULL, NULL); 2290 2291 if (packet->status) { 2292 ath6kl_err("htc_wait_for_ctrl_msg, ath6kl_htc_rx_process_hdr failed (status = %d)\n", 2293 packet->status); 2294 goto fail_ctrl_rx; 2295 } 2296 2297 return packet; 2298 2299 fail_ctrl_rx: 2300 if (packet != NULL) { 2301 htc_rxpkt_reset(packet); 2302 reclaim_rx_ctrl_buf(target, packet); 2303 } 2304 2305 return NULL; 2306 } 2307 2308 static int ath6kl_htc_mbox_add_rxbuf_multiple(struct htc_target *target, 2309 struct list_head *pkt_queue) 2310 { 2311 struct htc_endpoint *endpoint; 2312 struct htc_packet *first_pkt; 2313 bool rx_unblock = false; 2314 int status = 0, depth; 2315 2316 if (list_empty(pkt_queue)) 2317 return -ENOMEM; 2318 2319 first_pkt = list_first_entry(pkt_queue, struct htc_packet, list); 2320 2321 if (first_pkt->endpoint >= ENDPOINT_MAX) 2322 return status; 2323 2324 depth = get_queue_depth(pkt_queue); 2325 2326 ath6kl_dbg(ATH6KL_DBG_HTC, 2327 "htc rx add multiple ep id %d cnt %d len %d\n", 2328 first_pkt->endpoint, depth, first_pkt->buf_len); 2329 2330 endpoint = &target->endpoint[first_pkt->endpoint]; 2331 2332 if (target->htc_flags & HTC_OP_STATE_STOPPING) { 2333 struct htc_packet *packet, *tmp_pkt; 2334 2335 /* walk through queue and mark each one canceled */ 2336 list_for_each_entry_safe(packet, tmp_pkt, pkt_queue, list) { 2337 packet->status = -ECANCELED; 2338 list_del(&packet->list); 2339 ath6kl_htc_rx_complete(endpoint, packet); 2340 } 2341 2342 return status; 2343 } 2344 2345 spin_lock_bh(&target->rx_lock); 2346 2347 list_splice_tail_init(pkt_queue, &endpoint->rx_bufq); 2348 2349 /* check if we are blocked waiting for a new buffer */ 2350 if (target->rx_st_flags & HTC_RECV_WAIT_BUFFERS) { 2351 if (target->ep_waiting == first_pkt->endpoint) { 2352 ath6kl_dbg(ATH6KL_DBG_HTC, 2353 "htc rx blocked on ep %d, unblocking\n", 2354 target->ep_waiting); 2355 target->rx_st_flags &= ~HTC_RECV_WAIT_BUFFERS; 2356 target->ep_waiting = ENDPOINT_MAX; 2357 rx_unblock = true; 2358 } 2359 } 2360 2361 spin_unlock_bh(&target->rx_lock); 2362 2363 if (rx_unblock && !(target->htc_flags & HTC_OP_STATE_STOPPING)) 2364 /* TODO : implement a buffer threshold count? */ 2365 ath6kl_hif_rx_control(target->dev, true); 2366 2367 return status; 2368 } 2369 2370 static void ath6kl_htc_mbox_flush_rx_buf(struct htc_target *target) 2371 { 2372 struct htc_endpoint *endpoint; 2373 struct htc_packet *packet, *tmp_pkt; 2374 int i; 2375 2376 for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) { 2377 endpoint = &target->endpoint[i]; 2378 if (!endpoint->svc_id) 2379 /* not in use.. */ 2380 continue; 2381 2382 spin_lock_bh(&target->rx_lock); 2383 list_for_each_entry_safe(packet, tmp_pkt, 2384 &endpoint->rx_bufq, list) { 2385 list_del(&packet->list); 2386 spin_unlock_bh(&target->rx_lock); 2387 ath6kl_dbg(ATH6KL_DBG_HTC, 2388 "htc rx flush pkt 0x%p len %d ep %d\n", 2389 packet, packet->buf_len, 2390 packet->endpoint); 2391 /* 2392 * packets in rx_bufq of endpoint 0 have originally 2393 * been queued from target->free_ctrl_rxbuf where 2394 * packet and packet->buf_start are allocated 2395 * separately using kmalloc(). For other endpoint 2396 * rx_bufq, it is allocated as skb where packet is 2397 * skb->head. Take care of this difference while freeing 2398 * the memory. 2399 */ 2400 if (packet->endpoint == ENDPOINT_0) { 2401 kfree(packet->buf_start); 2402 kfree(packet); 2403 } else { 2404 dev_kfree_skb(packet->pkt_cntxt); 2405 } 2406 spin_lock_bh(&target->rx_lock); 2407 } 2408 spin_unlock_bh(&target->rx_lock); 2409 } 2410 } 2411 2412 static int ath6kl_htc_mbox_conn_service(struct htc_target *target, 2413 struct htc_service_connect_req *conn_req, 2414 struct htc_service_connect_resp *conn_resp) 2415 { 2416 struct htc_packet *rx_pkt = NULL; 2417 struct htc_packet *tx_pkt = NULL; 2418 struct htc_conn_service_resp *resp_msg; 2419 struct htc_conn_service_msg *conn_msg; 2420 struct htc_endpoint *endpoint; 2421 enum htc_endpoint_id assigned_ep = ENDPOINT_MAX; 2422 unsigned int max_msg_sz = 0; 2423 int status = 0; 2424 u16 msg_id; 2425 2426 ath6kl_dbg(ATH6KL_DBG_HTC, 2427 "htc connect service target 0x%p service id 0x%x\n", 2428 target, conn_req->svc_id); 2429 2430 if (conn_req->svc_id == HTC_CTRL_RSVD_SVC) { 2431 /* special case for pseudo control service */ 2432 assigned_ep = ENDPOINT_0; 2433 max_msg_sz = HTC_MAX_CTRL_MSG_LEN; 2434 } else { 2435 /* allocate a packet to send to the target */ 2436 tx_pkt = htc_get_control_buf(target, true); 2437 2438 if (!tx_pkt) 2439 return -ENOMEM; 2440 2441 conn_msg = (struct htc_conn_service_msg *)tx_pkt->buf; 2442 memset(conn_msg, 0, sizeof(*conn_msg)); 2443 conn_msg->msg_id = cpu_to_le16(HTC_MSG_CONN_SVC_ID); 2444 conn_msg->svc_id = cpu_to_le16(conn_req->svc_id); 2445 conn_msg->conn_flags = cpu_to_le16(conn_req->conn_flags); 2446 2447 set_htc_pkt_info(tx_pkt, NULL, (u8 *) conn_msg, 2448 sizeof(*conn_msg) + conn_msg->svc_meta_len, 2449 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG); 2450 2451 /* we want synchronous operation */ 2452 tx_pkt->completion = NULL; 2453 ath6kl_htc_tx_prep_pkt(tx_pkt, 0, 0, 0); 2454 status = ath6kl_htc_tx_issue(target, tx_pkt); 2455 2456 if (status) 2457 goto fail_tx; 2458 2459 /* wait for response */ 2460 rx_pkt = htc_wait_for_ctrl_msg(target); 2461 2462 if (!rx_pkt) { 2463 status = -ENOMEM; 2464 goto fail_tx; 2465 } 2466 2467 resp_msg = (struct htc_conn_service_resp *)rx_pkt->buf; 2468 msg_id = le16_to_cpu(resp_msg->msg_id); 2469 2470 if ((msg_id != HTC_MSG_CONN_SVC_RESP_ID) || 2471 (rx_pkt->act_len < sizeof(*resp_msg))) { 2472 status = -ENOMEM; 2473 goto fail_tx; 2474 } 2475 2476 conn_resp->resp_code = resp_msg->status; 2477 /* check response status */ 2478 if (resp_msg->status != HTC_SERVICE_SUCCESS) { 2479 ath6kl_err("target failed service 0x%X connect request (status:%d)\n", 2480 resp_msg->svc_id, resp_msg->status); 2481 status = -ENOMEM; 2482 goto fail_tx; 2483 } 2484 2485 assigned_ep = (enum htc_endpoint_id)resp_msg->eid; 2486 max_msg_sz = le16_to_cpu(resp_msg->max_msg_sz); 2487 } 2488 2489 if (assigned_ep >= ENDPOINT_MAX || !max_msg_sz) { 2490 status = -ENOMEM; 2491 goto fail_tx; 2492 } 2493 2494 endpoint = &target->endpoint[assigned_ep]; 2495 endpoint->eid = assigned_ep; 2496 if (endpoint->svc_id) { 2497 status = -ENOMEM; 2498 goto fail_tx; 2499 } 2500 2501 /* return assigned endpoint to caller */ 2502 conn_resp->endpoint = assigned_ep; 2503 conn_resp->len_max = max_msg_sz; 2504 2505 /* setup the endpoint */ 2506 2507 /* this marks the endpoint in use */ 2508 endpoint->svc_id = conn_req->svc_id; 2509 2510 endpoint->max_txq_depth = conn_req->max_txq_depth; 2511 endpoint->len_max = max_msg_sz; 2512 endpoint->ep_cb = conn_req->ep_cb; 2513 endpoint->cred_dist.svc_id = conn_req->svc_id; 2514 endpoint->cred_dist.htc_ep = endpoint; 2515 endpoint->cred_dist.endpoint = assigned_ep; 2516 endpoint->cred_dist.cred_sz = target->tgt_cred_sz; 2517 2518 switch (endpoint->svc_id) { 2519 case WMI_DATA_BK_SVC: 2520 endpoint->tx_drop_packet_threshold = MAX_DEF_COOKIE_NUM / 3; 2521 break; 2522 default: 2523 endpoint->tx_drop_packet_threshold = MAX_HI_COOKIE_NUM; 2524 break; 2525 } 2526 2527 if (conn_req->max_rxmsg_sz) { 2528 /* 2529 * Override cred_per_msg calculation, this optimizes 2530 * the credit-low indications since the host will actually 2531 * issue smaller messages in the Send path. 2532 */ 2533 if (conn_req->max_rxmsg_sz > max_msg_sz) { 2534 status = -ENOMEM; 2535 goto fail_tx; 2536 } 2537 endpoint->cred_dist.cred_per_msg = 2538 conn_req->max_rxmsg_sz / target->tgt_cred_sz; 2539 } else 2540 endpoint->cred_dist.cred_per_msg = 2541 max_msg_sz / target->tgt_cred_sz; 2542 2543 if (!endpoint->cred_dist.cred_per_msg) 2544 endpoint->cred_dist.cred_per_msg = 1; 2545 2546 /* save local connection flags */ 2547 endpoint->conn_flags = conn_req->flags; 2548 2549 fail_tx: 2550 if (tx_pkt) 2551 htc_reclaim_txctrl_buf(target, tx_pkt); 2552 2553 if (rx_pkt) { 2554 htc_rxpkt_reset(rx_pkt); 2555 reclaim_rx_ctrl_buf(target, rx_pkt); 2556 } 2557 2558 return status; 2559 } 2560 2561 static void reset_ep_state(struct htc_target *target) 2562 { 2563 struct htc_endpoint *endpoint; 2564 int i; 2565 2566 for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) { 2567 endpoint = &target->endpoint[i]; 2568 memset(&endpoint->cred_dist, 0, sizeof(endpoint->cred_dist)); 2569 endpoint->svc_id = 0; 2570 endpoint->len_max = 0; 2571 endpoint->max_txq_depth = 0; 2572 memset(&endpoint->ep_st, 0, 2573 sizeof(endpoint->ep_st)); 2574 INIT_LIST_HEAD(&endpoint->rx_bufq); 2575 INIT_LIST_HEAD(&endpoint->txq); 2576 endpoint->target = target; 2577 } 2578 2579 /* reset distribution list */ 2580 /* FIXME: free existing entries */ 2581 INIT_LIST_HEAD(&target->cred_dist_list); 2582 } 2583 2584 static int ath6kl_htc_mbox_get_rxbuf_num(struct htc_target *target, 2585 enum htc_endpoint_id endpoint) 2586 { 2587 int num; 2588 2589 spin_lock_bh(&target->rx_lock); 2590 num = get_queue_depth(&(target->endpoint[endpoint].rx_bufq)); 2591 spin_unlock_bh(&target->rx_lock); 2592 return num; 2593 } 2594 2595 static void htc_setup_msg_bndl(struct htc_target *target) 2596 { 2597 /* limit what HTC can handle */ 2598 target->msg_per_bndl_max = min(HTC_HOST_MAX_MSG_PER_BUNDLE, 2599 target->msg_per_bndl_max); 2600 2601 if (ath6kl_hif_enable_scatter(target->dev->ar)) { 2602 target->msg_per_bndl_max = 0; 2603 return; 2604 } 2605 2606 /* limit bundle what the device layer can handle */ 2607 target->msg_per_bndl_max = min(target->max_scat_entries, 2608 target->msg_per_bndl_max); 2609 2610 ath6kl_dbg(ATH6KL_DBG_BOOT, 2611 "htc bundling allowed msg_per_bndl_max %d\n", 2612 target->msg_per_bndl_max); 2613 2614 /* Max rx bundle size is limited by the max tx bundle size */ 2615 target->max_rx_bndl_sz = target->max_xfer_szper_scatreq; 2616 /* Max tx bundle size if limited by the extended mbox address range */ 2617 target->max_tx_bndl_sz = min(HIF_MBOX0_EXT_WIDTH, 2618 target->max_xfer_szper_scatreq); 2619 2620 ath6kl_dbg(ATH6KL_DBG_BOOT, "htc max_rx_bndl_sz %d max_tx_bndl_sz %d\n", 2621 target->max_rx_bndl_sz, target->max_tx_bndl_sz); 2622 2623 if (target->max_tx_bndl_sz) 2624 /* tx_bndl_mask is enabled per AC, each has 1 bit */ 2625 target->tx_bndl_mask = (1 << WMM_NUM_AC) - 1; 2626 2627 if (target->max_rx_bndl_sz) 2628 target->rx_bndl_enable = true; 2629 2630 if ((target->tgt_cred_sz % target->block_sz) != 0) { 2631 ath6kl_warn("credit size: %d is not block aligned! Disabling send bundling\n", 2632 target->tgt_cred_sz); 2633 2634 /* 2635 * Disallow send bundling since the credit size is 2636 * not aligned to a block size the I/O block 2637 * padding will spill into the next credit buffer 2638 * which is fatal. 2639 */ 2640 target->tx_bndl_mask = 0; 2641 } 2642 } 2643 2644 static int ath6kl_htc_mbox_wait_target(struct htc_target *target) 2645 { 2646 struct htc_packet *packet = NULL; 2647 struct htc_ready_ext_msg *rdy_msg; 2648 struct htc_service_connect_req connect; 2649 struct htc_service_connect_resp resp; 2650 int status; 2651 2652 /* FIXME: remove once USB support is implemented */ 2653 if (target->dev->ar->hif_type == ATH6KL_HIF_TYPE_USB) { 2654 ath6kl_err("HTC doesn't support USB yet. Patience!\n"); 2655 return -EOPNOTSUPP; 2656 } 2657 2658 /* we should be getting 1 control message that the target is ready */ 2659 packet = htc_wait_for_ctrl_msg(target); 2660 2661 if (!packet) 2662 return -ENOMEM; 2663 2664 /* we controlled the buffer creation so it's properly aligned */ 2665 rdy_msg = (struct htc_ready_ext_msg *)packet->buf; 2666 2667 if ((le16_to_cpu(rdy_msg->ver2_0_info.msg_id) != HTC_MSG_READY_ID) || 2668 (packet->act_len < sizeof(struct htc_ready_msg))) { 2669 status = -ENOMEM; 2670 goto fail_wait_target; 2671 } 2672 2673 if (!rdy_msg->ver2_0_info.cred_cnt || !rdy_msg->ver2_0_info.cred_sz) { 2674 status = -ENOMEM; 2675 goto fail_wait_target; 2676 } 2677 2678 target->tgt_creds = le16_to_cpu(rdy_msg->ver2_0_info.cred_cnt); 2679 target->tgt_cred_sz = le16_to_cpu(rdy_msg->ver2_0_info.cred_sz); 2680 2681 ath6kl_dbg(ATH6KL_DBG_BOOT, 2682 "htc target ready credits %d size %d\n", 2683 target->tgt_creds, target->tgt_cred_sz); 2684 2685 /* check if this is an extended ready message */ 2686 if (packet->act_len >= sizeof(struct htc_ready_ext_msg)) { 2687 /* this is an extended message */ 2688 target->htc_tgt_ver = rdy_msg->htc_ver; 2689 target->msg_per_bndl_max = rdy_msg->msg_per_htc_bndl; 2690 } else { 2691 /* legacy */ 2692 target->htc_tgt_ver = HTC_VERSION_2P0; 2693 target->msg_per_bndl_max = 0; 2694 } 2695 2696 ath6kl_dbg(ATH6KL_DBG_BOOT, "htc using protocol %s (%d)\n", 2697 (target->htc_tgt_ver == HTC_VERSION_2P0) ? "2.0" : ">= 2.1", 2698 target->htc_tgt_ver); 2699 2700 if (target->msg_per_bndl_max > 0) 2701 htc_setup_msg_bndl(target); 2702 2703 /* setup our pseudo HTC control endpoint connection */ 2704 memset(&connect, 0, sizeof(connect)); 2705 memset(&resp, 0, sizeof(resp)); 2706 connect.ep_cb.rx = htc_ctrl_rx; 2707 connect.ep_cb.rx_refill = NULL; 2708 connect.ep_cb.tx_full = NULL; 2709 connect.max_txq_depth = NUM_CONTROL_BUFFERS; 2710 connect.svc_id = HTC_CTRL_RSVD_SVC; 2711 2712 /* connect fake service */ 2713 status = ath6kl_htc_mbox_conn_service((void *)target, &connect, &resp); 2714 2715 if (status) 2716 /* 2717 * FIXME: this call doesn't make sense, the caller should 2718 * call ath6kl_htc_mbox_cleanup() when it wants remove htc 2719 */ 2720 ath6kl_hif_cleanup_scatter(target->dev->ar); 2721 2722 fail_wait_target: 2723 if (packet) { 2724 htc_rxpkt_reset(packet); 2725 reclaim_rx_ctrl_buf(target, packet); 2726 } 2727 2728 return status; 2729 } 2730 2731 /* 2732 * Start HTC, enable interrupts and let the target know 2733 * host has finished setup. 2734 */ 2735 static int ath6kl_htc_mbox_start(struct htc_target *target) 2736 { 2737 struct htc_packet *packet; 2738 int status; 2739 2740 memset(&target->dev->irq_proc_reg, 0, 2741 sizeof(target->dev->irq_proc_reg)); 2742 2743 /* Disable interrupts at the chip level */ 2744 ath6kl_hif_disable_intrs(target->dev); 2745 2746 target->htc_flags = 0; 2747 target->rx_st_flags = 0; 2748 2749 /* Push control receive buffers into htc control endpoint */ 2750 while ((packet = htc_get_control_buf(target, false)) != NULL) { 2751 status = htc_add_rxbuf(target, packet); 2752 if (status) 2753 return status; 2754 } 2755 2756 /* NOTE: the first entry in the distribution list is ENDPOINT_0 */ 2757 ath6kl_credit_init(target->credit_info, &target->cred_dist_list, 2758 target->tgt_creds); 2759 2760 dump_cred_dist_stats(target); 2761 2762 /* Indicate to the target of the setup completion */ 2763 status = htc_setup_tx_complete(target); 2764 2765 if (status) 2766 return status; 2767 2768 /* unmask interrupts */ 2769 status = ath6kl_hif_unmask_intrs(target->dev); 2770 2771 if (status) 2772 ath6kl_htc_mbox_stop(target); 2773 2774 return status; 2775 } 2776 2777 static int ath6kl_htc_reset(struct htc_target *target) 2778 { 2779 u32 block_size, ctrl_bufsz; 2780 struct htc_packet *packet; 2781 int i; 2782 2783 reset_ep_state(target); 2784 2785 block_size = target->dev->ar->mbox_info.block_size; 2786 2787 ctrl_bufsz = (block_size > HTC_MAX_CTRL_MSG_LEN) ? 2788 (block_size + HTC_HDR_LENGTH) : 2789 (HTC_MAX_CTRL_MSG_LEN + HTC_HDR_LENGTH); 2790 2791 for (i = 0; i < NUM_CONTROL_BUFFERS; i++) { 2792 packet = kzalloc(sizeof(*packet), GFP_KERNEL); 2793 if (!packet) 2794 return -ENOMEM; 2795 2796 packet->buf_start = kzalloc(ctrl_bufsz, GFP_KERNEL); 2797 if (!packet->buf_start) { 2798 kfree(packet); 2799 return -ENOMEM; 2800 } 2801 2802 packet->buf_len = ctrl_bufsz; 2803 if (i < NUM_CONTROL_RX_BUFFERS) { 2804 packet->act_len = 0; 2805 packet->buf = packet->buf_start; 2806 packet->endpoint = ENDPOINT_0; 2807 list_add_tail(&packet->list, &target->free_ctrl_rxbuf); 2808 } else 2809 list_add_tail(&packet->list, &target->free_ctrl_txbuf); 2810 } 2811 2812 return 0; 2813 } 2814 2815 /* htc_stop: stop interrupt reception, and flush all queued buffers */ 2816 static void ath6kl_htc_mbox_stop(struct htc_target *target) 2817 { 2818 spin_lock_bh(&target->htc_lock); 2819 target->htc_flags |= HTC_OP_STATE_STOPPING; 2820 spin_unlock_bh(&target->htc_lock); 2821 2822 /* 2823 * Masking interrupts is a synchronous operation, when this 2824 * function returns all pending HIF I/O has completed, we can 2825 * safely flush the queues. 2826 */ 2827 ath6kl_hif_mask_intrs(target->dev); 2828 2829 ath6kl_htc_flush_txep_all(target); 2830 2831 ath6kl_htc_mbox_flush_rx_buf(target); 2832 2833 ath6kl_htc_reset(target); 2834 } 2835 2836 static void *ath6kl_htc_mbox_create(struct ath6kl *ar) 2837 { 2838 struct htc_target *target = NULL; 2839 int status = 0; 2840 2841 target = kzalloc(sizeof(*target), GFP_KERNEL); 2842 if (!target) { 2843 ath6kl_err("unable to allocate memory\n"); 2844 return NULL; 2845 } 2846 2847 target->dev = kzalloc(sizeof(*target->dev), GFP_KERNEL); 2848 if (!target->dev) { 2849 ath6kl_err("unable to allocate memory\n"); 2850 status = -ENOMEM; 2851 goto err_htc_cleanup; 2852 } 2853 2854 spin_lock_init(&target->htc_lock); 2855 spin_lock_init(&target->rx_lock); 2856 spin_lock_init(&target->tx_lock); 2857 2858 INIT_LIST_HEAD(&target->free_ctrl_txbuf); 2859 INIT_LIST_HEAD(&target->free_ctrl_rxbuf); 2860 INIT_LIST_HEAD(&target->cred_dist_list); 2861 2862 target->dev->ar = ar; 2863 target->dev->htc_cnxt = target; 2864 target->ep_waiting = ENDPOINT_MAX; 2865 2866 status = ath6kl_hif_setup(target->dev); 2867 if (status) 2868 goto err_htc_cleanup; 2869 2870 status = ath6kl_htc_reset(target); 2871 if (status) 2872 goto err_htc_cleanup; 2873 2874 return target; 2875 2876 err_htc_cleanup: 2877 ath6kl_htc_mbox_cleanup(target); 2878 2879 return NULL; 2880 } 2881 2882 /* cleanup the HTC instance */ 2883 static void ath6kl_htc_mbox_cleanup(struct htc_target *target) 2884 { 2885 struct htc_packet *packet, *tmp_packet; 2886 2887 /* FIXME: remove check once USB support is implemented */ 2888 if (target->dev->ar->hif_type != ATH6KL_HIF_TYPE_USB) 2889 ath6kl_hif_cleanup_scatter(target->dev->ar); 2890 2891 list_for_each_entry_safe(packet, tmp_packet, 2892 &target->free_ctrl_txbuf, list) { 2893 list_del(&packet->list); 2894 kfree(packet->buf_start); 2895 kfree(packet); 2896 } 2897 2898 list_for_each_entry_safe(packet, tmp_packet, 2899 &target->free_ctrl_rxbuf, list) { 2900 list_del(&packet->list); 2901 kfree(packet->buf_start); 2902 kfree(packet); 2903 } 2904 2905 kfree(target->dev); 2906 kfree(target); 2907 } 2908 2909 static const struct ath6kl_htc_ops ath6kl_htc_mbox_ops = { 2910 .create = ath6kl_htc_mbox_create, 2911 .wait_target = ath6kl_htc_mbox_wait_target, 2912 .start = ath6kl_htc_mbox_start, 2913 .conn_service = ath6kl_htc_mbox_conn_service, 2914 .tx = ath6kl_htc_mbox_tx, 2915 .stop = ath6kl_htc_mbox_stop, 2916 .cleanup = ath6kl_htc_mbox_cleanup, 2917 .flush_txep = ath6kl_htc_mbox_flush_txep, 2918 .flush_rx_buf = ath6kl_htc_mbox_flush_rx_buf, 2919 .activity_changed = ath6kl_htc_mbox_activity_changed, 2920 .get_rxbuf_num = ath6kl_htc_mbox_get_rxbuf_num, 2921 .add_rxbuf_multiple = ath6kl_htc_mbox_add_rxbuf_multiple, 2922 .credit_setup = ath6kl_htc_mbox_credit_setup, 2923 }; 2924 2925 void ath6kl_htc_mbox_attach(struct ath6kl *ar) 2926 { 2927 ar->htc_ops = &ath6kl_htc_mbox_ops; 2928 } 2929