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