1 /* 2 * Copyright (c) 2007-2011 Atheros Communications Inc. 3 * Copyright (c) 2011-2012 Qualcomm Atheros, Inc. 4 * 5 * Permission to use, copy, modify, and/or distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #include "core.h" 19 #include "hif.h" 20 #include "debug.h" 21 #include "hif-ops.h" 22 #include "trace.h" 23 24 #include <linux/unaligned.h> 25 26 #define CALC_TXRX_PADDED_LEN(dev, len) (__ALIGN_MASK((len), (dev)->block_mask)) 27 28 static void ath6kl_htc_mbox_cleanup(struct htc_target *target); 29 static void ath6kl_htc_mbox_stop(struct htc_target *target); 30 static int ath6kl_htc_mbox_add_rxbuf_multiple(struct htc_target *target, 31 struct list_head *pkt_queue); 32 static void ath6kl_htc_set_credit_dist(struct htc_target *target, 33 struct ath6kl_htc_credit_info *cred_info, 34 u16 svc_pri_order[], int len); 35 36 /* threshold to re-enable Tx bundling for an AC*/ 37 #define TX_RESUME_BUNDLE_THRESHOLD 1500 38 39 /* Functions for Tx credit handling */ 40 static void ath6kl_credit_deposit(struct ath6kl_htc_credit_info *cred_info, 41 struct htc_endpoint_credit_dist *ep_dist, 42 int credits) 43 { 44 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit deposit ep %d credits %d\n", 45 ep_dist->endpoint, credits); 46 47 ep_dist->credits += credits; 48 ep_dist->cred_assngd += credits; 49 cred_info->cur_free_credits -= credits; 50 } 51 52 static void ath6kl_credit_init(struct ath6kl_htc_credit_info *cred_info, 53 struct list_head *ep_list, 54 int tot_credits) 55 { 56 struct htc_endpoint_credit_dist *cur_ep_dist; 57 int count; 58 59 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit init total %d\n", tot_credits); 60 61 cred_info->cur_free_credits = tot_credits; 62 cred_info->total_avail_credits = tot_credits; 63 64 list_for_each_entry(cur_ep_dist, ep_list, list) { 65 if (cur_ep_dist->endpoint == ENDPOINT_0) 66 continue; 67 68 cur_ep_dist->cred_min = cur_ep_dist->cred_per_msg; 69 70 if (tot_credits > 4) { 71 if ((cur_ep_dist->svc_id == WMI_DATA_BK_SVC) || 72 (cur_ep_dist->svc_id == WMI_DATA_BE_SVC)) { 73 ath6kl_credit_deposit(cred_info, 74 cur_ep_dist, 75 cur_ep_dist->cred_min); 76 cur_ep_dist->dist_flags |= HTC_EP_ACTIVE; 77 } 78 } 79 80 if (cur_ep_dist->svc_id == WMI_CONTROL_SVC) { 81 ath6kl_credit_deposit(cred_info, cur_ep_dist, 82 cur_ep_dist->cred_min); 83 /* 84 * Control service is always marked active, it 85 * never goes inactive EVER. 86 */ 87 cur_ep_dist->dist_flags |= HTC_EP_ACTIVE; 88 } 89 90 /* 91 * Streams have to be created (explicit | implicit) for all 92 * kinds of traffic. BE endpoints are also inactive in the 93 * beginning. When BE traffic starts it creates implicit 94 * streams that redistributes credits. 95 * 96 * Note: all other endpoints have minimums set but are 97 * initially given NO credits. credits will be distributed 98 * as traffic activity demands 99 */ 100 } 101 102 /* 103 * For ath6kl_credit_seek function, 104 * it use list_for_each_entry_reverse to walk around the whole ep list. 105 * Therefore assign this lowestpri_ep_dist after walk around the ep_list 106 */ 107 cred_info->lowestpri_ep_dist = cur_ep_dist->list; 108 109 WARN_ON(cred_info->cur_free_credits <= 0); 110 111 list_for_each_entry(cur_ep_dist, ep_list, list) { 112 if (cur_ep_dist->endpoint == ENDPOINT_0) 113 continue; 114 115 if (cur_ep_dist->svc_id == WMI_CONTROL_SVC) { 116 cur_ep_dist->cred_norm = cur_ep_dist->cred_per_msg; 117 } else { 118 /* 119 * For the remaining data endpoints, we assume that 120 * each cred_per_msg are the same. We use a simple 121 * calculation here, we take the remaining credits 122 * and determine how many max messages this can 123 * cover and then set each endpoint's normal value 124 * equal to 3/4 this amount. 125 */ 126 count = (cred_info->cur_free_credits / 127 cur_ep_dist->cred_per_msg) 128 * cur_ep_dist->cred_per_msg; 129 count = (count * 3) >> 2; 130 count = max(count, cur_ep_dist->cred_per_msg); 131 cur_ep_dist->cred_norm = count; 132 } 133 134 ath6kl_dbg(ATH6KL_DBG_CREDIT, 135 "credit ep %d svc_id %d credits %d per_msg %d norm %d min %d\n", 136 cur_ep_dist->endpoint, 137 cur_ep_dist->svc_id, 138 cur_ep_dist->credits, 139 cur_ep_dist->cred_per_msg, 140 cur_ep_dist->cred_norm, 141 cur_ep_dist->cred_min); 142 } 143 } 144 145 /* initialize and setup credit distribution */ 146 static int ath6kl_htc_mbox_credit_setup(struct htc_target *htc_target, 147 struct ath6kl_htc_credit_info *cred_info) 148 { 149 u16 servicepriority[5]; 150 151 memset(cred_info, 0, sizeof(struct ath6kl_htc_credit_info)); 152 153 servicepriority[0] = WMI_CONTROL_SVC; /* highest */ 154 servicepriority[1] = WMI_DATA_VO_SVC; 155 servicepriority[2] = WMI_DATA_VI_SVC; 156 servicepriority[3] = WMI_DATA_BE_SVC; 157 servicepriority[4] = WMI_DATA_BK_SVC; /* lowest */ 158 159 /* set priority list */ 160 ath6kl_htc_set_credit_dist(htc_target, cred_info, servicepriority, 5); 161 162 return 0; 163 } 164 165 /* reduce an ep's credits back to a set limit */ 166 static void ath6kl_credit_reduce(struct ath6kl_htc_credit_info *cred_info, 167 struct htc_endpoint_credit_dist *ep_dist, 168 int limit) 169 { 170 int credits; 171 172 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit reduce ep %d limit %d\n", 173 ep_dist->endpoint, limit); 174 175 ep_dist->cred_assngd = limit; 176 177 if (ep_dist->credits <= limit) 178 return; 179 180 credits = ep_dist->credits - limit; 181 ep_dist->credits -= credits; 182 cred_info->cur_free_credits += credits; 183 } 184 185 static void ath6kl_credit_update(struct ath6kl_htc_credit_info *cred_info, 186 struct list_head *epdist_list) 187 { 188 struct htc_endpoint_credit_dist *cur_list; 189 190 list_for_each_entry(cur_list, epdist_list, list) { 191 if (cur_list->endpoint == ENDPOINT_0) 192 continue; 193 194 if (cur_list->cred_to_dist > 0) { 195 cur_list->credits += cur_list->cred_to_dist; 196 cur_list->cred_to_dist = 0; 197 198 if (cur_list->credits > cur_list->cred_assngd) 199 ath6kl_credit_reduce(cred_info, 200 cur_list, 201 cur_list->cred_assngd); 202 203 if (cur_list->credits > cur_list->cred_norm) 204 ath6kl_credit_reduce(cred_info, cur_list, 205 cur_list->cred_norm); 206 207 if (!(cur_list->dist_flags & HTC_EP_ACTIVE)) { 208 if (cur_list->txq_depth == 0) 209 ath6kl_credit_reduce(cred_info, 210 cur_list, 0); 211 } 212 } 213 } 214 } 215 216 /* 217 * HTC has an endpoint that needs credits, ep_dist is the endpoint in 218 * question. 219 */ 220 static void ath6kl_credit_seek(struct ath6kl_htc_credit_info *cred_info, 221 struct htc_endpoint_credit_dist *ep_dist) 222 { 223 struct htc_endpoint_credit_dist *curdist_list; 224 int credits = 0; 225 int need; 226 227 if (ep_dist->svc_id == WMI_CONTROL_SVC) 228 goto out; 229 230 if ((ep_dist->svc_id == WMI_DATA_VI_SVC) || 231 (ep_dist->svc_id == WMI_DATA_VO_SVC)) 232 if ((ep_dist->cred_assngd >= ep_dist->cred_norm)) 233 goto out; 234 235 /* 236 * For all other services, we follow a simple algorithm of: 237 * 238 * 1. checking the free pool for credits 239 * 2. checking lower priority endpoints for credits to take 240 */ 241 242 credits = min(cred_info->cur_free_credits, ep_dist->seek_cred); 243 244 if (credits >= ep_dist->seek_cred) 245 goto out; 246 247 /* 248 * We don't have enough in the free pool, try taking away from 249 * lower priority services The rule for taking away credits: 250 * 251 * 1. Only take from lower priority endpoints 252 * 2. Only take what is allocated above the minimum (never 253 * starve an endpoint completely) 254 * 3. Only take what you need. 255 */ 256 257 list_for_each_entry_reverse(curdist_list, 258 &cred_info->lowestpri_ep_dist, 259 list) { 260 if (curdist_list == ep_dist) 261 break; 262 263 need = ep_dist->seek_cred - cred_info->cur_free_credits; 264 265 if ((curdist_list->cred_assngd - need) >= 266 curdist_list->cred_min) { 267 /* 268 * The current one has been allocated more than 269 * it's minimum and it has enough credits assigned 270 * above it's minimum to fulfill our need try to 271 * take away just enough to fulfill our need. 272 */ 273 ath6kl_credit_reduce(cred_info, curdist_list, 274 curdist_list->cred_assngd - need); 275 276 if (cred_info->cur_free_credits >= 277 ep_dist->seek_cred) 278 break; 279 } 280 281 if (curdist_list->endpoint == ENDPOINT_0) 282 break; 283 } 284 285 credits = min(cred_info->cur_free_credits, ep_dist->seek_cred); 286 287 out: 288 /* did we find some credits? */ 289 if (credits) 290 ath6kl_credit_deposit(cred_info, ep_dist, credits); 291 292 ep_dist->seek_cred = 0; 293 } 294 295 /* redistribute credits based on activity change */ 296 static void ath6kl_credit_redistribute(struct ath6kl_htc_credit_info *info, 297 struct list_head *ep_dist_list) 298 { 299 struct htc_endpoint_credit_dist *curdist_list; 300 301 list_for_each_entry(curdist_list, ep_dist_list, list) { 302 if (curdist_list->endpoint == ENDPOINT_0) 303 continue; 304 305 if ((curdist_list->svc_id == WMI_DATA_BK_SVC) || 306 (curdist_list->svc_id == WMI_DATA_BE_SVC)) 307 curdist_list->dist_flags |= HTC_EP_ACTIVE; 308 309 if ((curdist_list->svc_id != WMI_CONTROL_SVC) && 310 !(curdist_list->dist_flags & HTC_EP_ACTIVE)) { 311 if (curdist_list->txq_depth == 0) 312 ath6kl_credit_reduce(info, curdist_list, 0); 313 else 314 ath6kl_credit_reduce(info, 315 curdist_list, 316 curdist_list->cred_min); 317 } 318 } 319 } 320 321 /* 322 * 323 * This function is invoked whenever endpoints require credit 324 * distributions. A lock is held while this function is invoked, this 325 * function shall NOT block. The ep_dist_list is a list of distribution 326 * structures in prioritized order as defined by the call to the 327 * htc_set_credit_dist() api. 328 */ 329 static void ath6kl_credit_distribute(struct ath6kl_htc_credit_info *cred_info, 330 struct list_head *ep_dist_list, 331 enum htc_credit_dist_reason reason) 332 { 333 switch (reason) { 334 case HTC_CREDIT_DIST_SEND_COMPLETE: 335 ath6kl_credit_update(cred_info, ep_dist_list); 336 break; 337 case HTC_CREDIT_DIST_ACTIVITY_CHANGE: 338 ath6kl_credit_redistribute(cred_info, ep_dist_list); 339 break; 340 default: 341 break; 342 } 343 344 WARN_ON(cred_info->cur_free_credits > cred_info->total_avail_credits); 345 WARN_ON(cred_info->cur_free_credits < 0); 346 } 347 348 static void ath6kl_htc_tx_buf_align(u8 **buf, unsigned long len) 349 { 350 u8 *align_addr; 351 352 if (!IS_ALIGNED((unsigned long) *buf, 4)) { 353 align_addr = PTR_ALIGN(*buf - 4, 4); 354 memmove(align_addr, *buf, len); 355 *buf = align_addr; 356 } 357 } 358 359 static void ath6kl_htc_tx_prep_pkt(struct htc_packet *packet, u8 flags, 360 int ctrl0, int ctrl1) 361 { 362 struct htc_frame_hdr *hdr; 363 364 packet->buf -= HTC_HDR_LENGTH; 365 hdr = (struct htc_frame_hdr *)packet->buf; 366 367 put_unaligned_le16(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 trace_ath6kl_htc_tx(status, packet->endpoint, packet->buf, send_len); 541 542 return status; 543 } 544 545 static int htc_check_credits(struct htc_target *target, 546 struct htc_endpoint *ep, u8 *flags, 547 enum htc_endpoint_id eid, unsigned int len, 548 int *req_cred) 549 { 550 *req_cred = (len > target->tgt_cred_sz) ? 551 DIV_ROUND_UP(len, target->tgt_cred_sz) : 1; 552 553 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit check need %d got %d\n", 554 *req_cred, ep->cred_dist.credits); 555 556 if (ep->cred_dist.credits < *req_cred) { 557 if (eid == ENDPOINT_0) 558 return -EINVAL; 559 560 /* Seek more credits */ 561 ep->cred_dist.seek_cred = *req_cred - ep->cred_dist.credits; 562 563 ath6kl_credit_seek(target->credit_info, &ep->cred_dist); 564 565 ep->cred_dist.seek_cred = 0; 566 567 if (ep->cred_dist.credits < *req_cred) { 568 ath6kl_dbg(ATH6KL_DBG_CREDIT, 569 "credit not found for ep %d\n", 570 eid); 571 return -EINVAL; 572 } 573 } 574 575 ep->cred_dist.credits -= *req_cred; 576 ep->ep_st.cred_cosumd += *req_cred; 577 578 /* When we are getting low on credits, ask for more */ 579 if (ep->cred_dist.credits < ep->cred_dist.cred_per_msg) { 580 ep->cred_dist.seek_cred = 581 ep->cred_dist.cred_per_msg - ep->cred_dist.credits; 582 583 ath6kl_credit_seek(target->credit_info, &ep->cred_dist); 584 585 /* see if we were successful in getting more */ 586 if (ep->cred_dist.credits < ep->cred_dist.cred_per_msg) { 587 /* tell the target we need credits ASAP! */ 588 *flags |= HTC_FLAGS_NEED_CREDIT_UPDATE; 589 ep->ep_st.cred_low_indicate += 1; 590 ath6kl_dbg(ATH6KL_DBG_CREDIT, 591 "credit we need credits asap\n"); 592 } 593 } 594 595 return 0; 596 } 597 598 static void ath6kl_htc_tx_pkts_get(struct htc_target *target, 599 struct htc_endpoint *endpoint, 600 struct list_head *queue) 601 { 602 int req_cred; 603 u8 flags; 604 struct htc_packet *packet; 605 unsigned int len; 606 607 while (true) { 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, i; 761 struct htc_packet *packet; 762 int status; 763 u32 txb_mask; 764 u8 ac = WMM_NUM_AC; 765 766 if ((HTC_CTRL_RSVD_SVC != endpoint->svc_id) && 767 (WMI_CONTROL_SVC != endpoint->svc_id)) 768 ac = target->dev->ar->ep2ac_map[endpoint->eid]; 769 770 while (true) { 771 status = 0; 772 n_scat = get_queue_depth(queue); 773 n_scat = min(n_scat, target->msg_per_bndl_max); 774 775 if (n_scat < HTC_MIN_HTC_MSGS_TO_BUNDLE) 776 /* not enough to bundle */ 777 break; 778 779 scat_req = hif_scatter_req_get(target->dev->ar); 780 781 if (!scat_req) { 782 /* no scatter resources */ 783 ath6kl_dbg(ATH6KL_DBG_HTC, 784 "htc tx no more scatter resources\n"); 785 break; 786 } 787 788 if ((ac < WMM_NUM_AC) && (ac != WMM_AC_BK)) { 789 if (WMM_AC_BE == ac) 790 /* 791 * BE, BK have priorities and bit 792 * positions reversed 793 */ 794 txb_mask = (1 << WMM_AC_BK); 795 else 796 /* 797 * any AC with priority lower than 798 * itself 799 */ 800 txb_mask = ((1 << ac) - 1); 801 802 /* 803 * when the scatter request resources drop below a 804 * certain threshold, disable Tx bundling for all 805 * AC's with priority lower than the current requesting 806 * AC. Otherwise re-enable Tx bundling for them 807 */ 808 if (scat_req->scat_q_depth < ATH6KL_SCATTER_REQS) 809 target->tx_bndl_mask &= ~txb_mask; 810 else 811 target->tx_bndl_mask |= txb_mask; 812 } 813 814 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx pkts to scatter: %d\n", 815 n_scat); 816 817 scat_req->len = 0; 818 scat_req->scat_entries = 0; 819 820 status = ath6kl_htc_tx_setup_scat_list(target, endpoint, 821 scat_req, n_scat, 822 queue); 823 if (status == -EAGAIN) { 824 hif_scatter_req_add(target->dev->ar, scat_req); 825 break; 826 } 827 828 /* send path is always asynchronous */ 829 scat_req->complete = htc_async_tx_scat_complete; 830 n_sent_bundle++; 831 tot_pkts_bundle += scat_req->scat_entries; 832 833 ath6kl_dbg(ATH6KL_DBG_HTC, 834 "htc tx scatter bytes %d entries %d\n", 835 scat_req->len, scat_req->scat_entries); 836 837 for (i = 0; i < scat_req->scat_entries; i++) { 838 packet = scat_req->scat_list[i].packet; 839 trace_ath6kl_htc_tx(packet->status, packet->endpoint, 840 packet->buf, packet->act_len); 841 } 842 843 ath6kl_hif_submit_scat_req(target->dev, scat_req, false); 844 845 if (status) 846 break; 847 } 848 849 *sent_bundle = n_sent_bundle; 850 *n_bundle_pkts = tot_pkts_bundle; 851 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx bundle sent %d pkts\n", 852 n_sent_bundle); 853 854 return; 855 } 856 857 static void ath6kl_htc_tx_from_queue(struct htc_target *target, 858 struct htc_endpoint *endpoint) 859 { 860 struct list_head txq; 861 struct htc_packet *packet; 862 int bundle_sent; 863 int n_pkts_bundle; 864 u8 ac = WMM_NUM_AC; 865 int status; 866 867 spin_lock_bh(&target->tx_lock); 868 869 endpoint->tx_proc_cnt++; 870 if (endpoint->tx_proc_cnt > 1) { 871 endpoint->tx_proc_cnt--; 872 spin_unlock_bh(&target->tx_lock); 873 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx busy\n"); 874 return; 875 } 876 877 /* 878 * drain the endpoint TX queue for transmission as long 879 * as we have enough credits. 880 */ 881 INIT_LIST_HEAD(&txq); 882 883 if ((HTC_CTRL_RSVD_SVC != endpoint->svc_id) && 884 (WMI_CONTROL_SVC != endpoint->svc_id)) 885 ac = target->dev->ar->ep2ac_map[endpoint->eid]; 886 887 while (true) { 888 if (list_empty(&endpoint->txq)) 889 break; 890 891 ath6kl_htc_tx_pkts_get(target, endpoint, &txq); 892 893 if (list_empty(&txq)) 894 break; 895 896 spin_unlock_bh(&target->tx_lock); 897 898 bundle_sent = 0; 899 n_pkts_bundle = 0; 900 901 while (true) { 902 /* try to send a bundle on each pass */ 903 if ((target->tx_bndl_mask) && 904 (get_queue_depth(&txq) >= 905 HTC_MIN_HTC_MSGS_TO_BUNDLE)) { 906 int temp1 = 0, temp2 = 0; 907 908 /* check if bundling is enabled for an AC */ 909 if (target->tx_bndl_mask & (1 << ac)) { 910 ath6kl_htc_tx_bundle(endpoint, &txq, 911 &temp1, &temp2); 912 bundle_sent += temp1; 913 n_pkts_bundle += temp2; 914 } 915 } 916 917 if (list_empty(&txq)) 918 break; 919 920 packet = list_first_entry(&txq, struct htc_packet, 921 list); 922 list_del(&packet->list); 923 924 ath6kl_htc_tx_prep_pkt(packet, packet->info.tx.flags, 925 0, packet->info.tx.seqno); 926 status = ath6kl_htc_tx_issue(target, packet); 927 928 if (status) { 929 packet->status = status; 930 packet->completion(packet->context, packet); 931 } 932 } 933 934 spin_lock_bh(&target->tx_lock); 935 936 endpoint->ep_st.tx_bundles += bundle_sent; 937 endpoint->ep_st.tx_pkt_bundled += n_pkts_bundle; 938 939 /* 940 * if an AC has bundling disabled and no tx bundling 941 * has occured continously for a certain number of TX, 942 * enable tx bundling for this AC 943 */ 944 if (!bundle_sent) { 945 if (!(target->tx_bndl_mask & (1 << ac)) && 946 (ac < WMM_NUM_AC)) { 947 if (++target->ac_tx_count[ac] >= 948 TX_RESUME_BUNDLE_THRESHOLD) { 949 target->ac_tx_count[ac] = 0; 950 target->tx_bndl_mask |= (1 << ac); 951 } 952 } 953 } else { 954 /* tx bundling will reset the counter */ 955 if (ac < WMM_NUM_AC) 956 target->ac_tx_count[ac] = 0; 957 } 958 } 959 960 endpoint->tx_proc_cnt = 0; 961 spin_unlock_bh(&target->tx_lock); 962 } 963 964 static bool ath6kl_htc_tx_try(struct htc_target *target, 965 struct htc_endpoint *endpoint, 966 struct htc_packet *tx_pkt) 967 { 968 struct htc_ep_callbacks ep_cb; 969 int txq_depth; 970 bool overflow = false; 971 972 ep_cb = endpoint->ep_cb; 973 974 spin_lock_bh(&target->tx_lock); 975 txq_depth = get_queue_depth(&endpoint->txq); 976 spin_unlock_bh(&target->tx_lock); 977 978 if (txq_depth >= endpoint->max_txq_depth) 979 overflow = true; 980 981 if (overflow) 982 ath6kl_dbg(ATH6KL_DBG_HTC, 983 "htc tx overflow ep %d depth %d max %d\n", 984 endpoint->eid, txq_depth, 985 endpoint->max_txq_depth); 986 987 if (overflow && ep_cb.tx_full) { 988 if (ep_cb.tx_full(endpoint->target, tx_pkt) == 989 HTC_SEND_FULL_DROP) { 990 endpoint->ep_st.tx_dropped += 1; 991 return false; 992 } 993 } 994 995 spin_lock_bh(&target->tx_lock); 996 list_add_tail(&tx_pkt->list, &endpoint->txq); 997 spin_unlock_bh(&target->tx_lock); 998 999 ath6kl_htc_tx_from_queue(target, endpoint); 1000 1001 return true; 1002 } 1003 1004 static void htc_chk_ep_txq(struct htc_target *target) 1005 { 1006 struct htc_endpoint *endpoint; 1007 struct htc_endpoint_credit_dist *cred_dist; 1008 1009 /* 1010 * Run through the credit distribution list to see if there are 1011 * packets queued. NOTE: no locks need to be taken since the 1012 * distribution list is not dynamic (cannot be re-ordered) and we 1013 * are not modifying any state. 1014 */ 1015 list_for_each_entry(cred_dist, &target->cred_dist_list, list) { 1016 endpoint = cred_dist->htc_ep; 1017 1018 spin_lock_bh(&target->tx_lock); 1019 if (!list_empty(&endpoint->txq)) { 1020 ath6kl_dbg(ATH6KL_DBG_HTC, 1021 "htc creds ep %d credits %d pkts %d\n", 1022 cred_dist->endpoint, 1023 endpoint->cred_dist.credits, 1024 get_queue_depth(&endpoint->txq)); 1025 spin_unlock_bh(&target->tx_lock); 1026 /* 1027 * Try to start the stalled queue, this list is 1028 * ordered by priority. If there are credits 1029 * available the highest priority queue will get a 1030 * chance to reclaim credits from lower priority 1031 * ones. 1032 */ 1033 ath6kl_htc_tx_from_queue(target, endpoint); 1034 spin_lock_bh(&target->tx_lock); 1035 } 1036 spin_unlock_bh(&target->tx_lock); 1037 } 1038 } 1039 1040 static int htc_setup_tx_complete(struct htc_target *target) 1041 { 1042 struct htc_packet *send_pkt = NULL; 1043 int status; 1044 1045 send_pkt = htc_get_control_buf(target, true); 1046 1047 if (!send_pkt) 1048 return -ENOMEM; 1049 1050 if (target->htc_tgt_ver >= HTC_VERSION_2P1) { 1051 struct htc_setup_comp_ext_msg *setup_comp_ext; 1052 u32 flags = 0; 1053 1054 setup_comp_ext = 1055 (struct htc_setup_comp_ext_msg *)send_pkt->buf; 1056 memset(setup_comp_ext, 0, sizeof(*setup_comp_ext)); 1057 setup_comp_ext->msg_id = 1058 cpu_to_le16(HTC_MSG_SETUP_COMPLETE_EX_ID); 1059 1060 if (target->msg_per_bndl_max > 0) { 1061 /* Indicate HTC bundling to the target */ 1062 flags |= HTC_SETUP_COMP_FLG_RX_BNDL_EN; 1063 setup_comp_ext->msg_per_rxbndl = 1064 target->msg_per_bndl_max; 1065 } 1066 1067 memcpy(&setup_comp_ext->flags, &flags, 1068 sizeof(setup_comp_ext->flags)); 1069 set_htc_pkt_info(send_pkt, NULL, (u8 *) setup_comp_ext, 1070 sizeof(struct htc_setup_comp_ext_msg), 1071 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG); 1072 1073 } else { 1074 struct htc_setup_comp_msg *setup_comp; 1075 setup_comp = (struct htc_setup_comp_msg *)send_pkt->buf; 1076 memset(setup_comp, 0, sizeof(struct htc_setup_comp_msg)); 1077 setup_comp->msg_id = cpu_to_le16(HTC_MSG_SETUP_COMPLETE_ID); 1078 set_htc_pkt_info(send_pkt, NULL, (u8 *) setup_comp, 1079 sizeof(struct htc_setup_comp_msg), 1080 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG); 1081 } 1082 1083 /* we want synchronous operation */ 1084 send_pkt->completion = NULL; 1085 ath6kl_htc_tx_prep_pkt(send_pkt, 0, 0, 0); 1086 status = ath6kl_htc_tx_issue(target, send_pkt); 1087 htc_reclaim_txctrl_buf(target, send_pkt); 1088 1089 return status; 1090 } 1091 1092 static void ath6kl_htc_set_credit_dist(struct htc_target *target, 1093 struct ath6kl_htc_credit_info *credit_info, 1094 u16 srvc_pri_order[], int list_len) 1095 { 1096 struct htc_endpoint *endpoint; 1097 int i, ep; 1098 1099 target->credit_info = credit_info; 1100 1101 list_add_tail(&target->endpoint[ENDPOINT_0].cred_dist.list, 1102 &target->cred_dist_list); 1103 1104 for (i = 0; i < list_len; i++) { 1105 for (ep = ENDPOINT_1; ep < ENDPOINT_MAX; ep++) { 1106 endpoint = &target->endpoint[ep]; 1107 if (endpoint->svc_id == srvc_pri_order[i]) { 1108 list_add_tail(&endpoint->cred_dist.list, 1109 &target->cred_dist_list); 1110 break; 1111 } 1112 } 1113 if (ep >= ENDPOINT_MAX) { 1114 WARN_ON(1); 1115 return; 1116 } 1117 } 1118 } 1119 1120 static int ath6kl_htc_mbox_tx(struct htc_target *target, 1121 struct htc_packet *packet) 1122 { 1123 struct htc_endpoint *endpoint; 1124 struct list_head queue; 1125 1126 ath6kl_dbg(ATH6KL_DBG_HTC, 1127 "htc tx ep id %d buf 0x%p len %d\n", 1128 packet->endpoint, packet->buf, packet->act_len); 1129 1130 if (packet->endpoint >= ENDPOINT_MAX) { 1131 WARN_ON(1); 1132 return -EINVAL; 1133 } 1134 1135 endpoint = &target->endpoint[packet->endpoint]; 1136 1137 if (!ath6kl_htc_tx_try(target, endpoint, packet)) { 1138 packet->status = (target->htc_flags & HTC_OP_STATE_STOPPING) ? 1139 -ECANCELED : -ENOSPC; 1140 INIT_LIST_HEAD(&queue); 1141 list_add(&packet->list, &queue); 1142 htc_tx_complete(endpoint, &queue); 1143 } 1144 1145 return 0; 1146 } 1147 1148 /* flush endpoint TX queue */ 1149 static void ath6kl_htc_mbox_flush_txep(struct htc_target *target, 1150 enum htc_endpoint_id eid, u16 tag) 1151 { 1152 struct htc_packet *packet, *tmp_pkt; 1153 struct list_head discard_q, container; 1154 struct htc_endpoint *endpoint = &target->endpoint[eid]; 1155 1156 if (!endpoint->svc_id) { 1157 WARN_ON(1); 1158 return; 1159 } 1160 1161 /* initialize the discard queue */ 1162 INIT_LIST_HEAD(&discard_q); 1163 1164 spin_lock_bh(&target->tx_lock); 1165 1166 list_for_each_entry_safe(packet, tmp_pkt, &endpoint->txq, list) { 1167 if ((tag == HTC_TX_PACKET_TAG_ALL) || 1168 (tag == packet->info.tx.tag)) 1169 list_move_tail(&packet->list, &discard_q); 1170 } 1171 1172 spin_unlock_bh(&target->tx_lock); 1173 1174 list_for_each_entry_safe(packet, tmp_pkt, &discard_q, list) { 1175 packet->status = -ECANCELED; 1176 list_del(&packet->list); 1177 ath6kl_dbg(ATH6KL_DBG_HTC, 1178 "htc tx flushing pkt 0x%p len %d ep %d tag 0x%x\n", 1179 packet, packet->act_len, 1180 packet->endpoint, packet->info.tx.tag); 1181 1182 INIT_LIST_HEAD(&container); 1183 list_add_tail(&packet->list, &container); 1184 htc_tx_complete(endpoint, &container); 1185 } 1186 } 1187 1188 static void ath6kl_htc_flush_txep_all(struct htc_target *target) 1189 { 1190 struct htc_endpoint *endpoint; 1191 int i; 1192 1193 dump_cred_dist_stats(target); 1194 1195 for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) { 1196 endpoint = &target->endpoint[i]; 1197 if (endpoint->svc_id == 0) 1198 /* not in use.. */ 1199 continue; 1200 ath6kl_htc_mbox_flush_txep(target, i, HTC_TX_PACKET_TAG_ALL); 1201 } 1202 } 1203 1204 static void ath6kl_htc_mbox_activity_changed(struct htc_target *target, 1205 enum htc_endpoint_id eid, 1206 bool active) 1207 { 1208 struct htc_endpoint *endpoint = &target->endpoint[eid]; 1209 bool dist = false; 1210 1211 if (endpoint->svc_id == 0) { 1212 WARN_ON(1); 1213 return; 1214 } 1215 1216 spin_lock_bh(&target->tx_lock); 1217 1218 if (active) { 1219 if (!(endpoint->cred_dist.dist_flags & HTC_EP_ACTIVE)) { 1220 endpoint->cred_dist.dist_flags |= HTC_EP_ACTIVE; 1221 dist = true; 1222 } 1223 } else { 1224 if (endpoint->cred_dist.dist_flags & HTC_EP_ACTIVE) { 1225 endpoint->cred_dist.dist_flags &= ~HTC_EP_ACTIVE; 1226 dist = true; 1227 } 1228 } 1229 1230 if (dist) { 1231 endpoint->cred_dist.txq_depth = 1232 get_queue_depth(&endpoint->txq); 1233 1234 ath6kl_dbg(ATH6KL_DBG_HTC, 1235 "htc tx activity ctxt 0x%p dist 0x%p\n", 1236 target->credit_info, &target->cred_dist_list); 1237 1238 ath6kl_credit_distribute(target->credit_info, 1239 &target->cred_dist_list, 1240 HTC_CREDIT_DIST_ACTIVITY_CHANGE); 1241 } 1242 1243 spin_unlock_bh(&target->tx_lock); 1244 1245 if (dist && !active) 1246 htc_chk_ep_txq(target); 1247 } 1248 1249 /* HTC Rx */ 1250 1251 static inline void ath6kl_htc_rx_update_stats(struct htc_endpoint *endpoint, 1252 int n_look_ahds) 1253 { 1254 endpoint->ep_st.rx_pkts++; 1255 if (n_look_ahds == 1) 1256 endpoint->ep_st.rx_lkahds++; 1257 else if (n_look_ahds > 1) 1258 endpoint->ep_st.rx_bundle_lkahd++; 1259 } 1260 1261 static inline bool htc_valid_rx_frame_len(struct htc_target *target, 1262 enum htc_endpoint_id eid, int len) 1263 { 1264 return (eid == target->dev->ar->ctrl_ep) ? 1265 len <= ATH6KL_BUFFER_SIZE : len <= ATH6KL_AMSDU_BUFFER_SIZE; 1266 } 1267 1268 static int htc_add_rxbuf(struct htc_target *target, struct htc_packet *packet) 1269 { 1270 struct list_head queue; 1271 1272 INIT_LIST_HEAD(&queue); 1273 list_add_tail(&packet->list, &queue); 1274 return ath6kl_htc_mbox_add_rxbuf_multiple(target, &queue); 1275 } 1276 1277 static void htc_reclaim_rxbuf(struct htc_target *target, 1278 struct htc_packet *packet, 1279 struct htc_endpoint *ep) 1280 { 1281 if (packet->info.rx.rx_flags & HTC_RX_PKT_NO_RECYCLE) { 1282 htc_rxpkt_reset(packet); 1283 packet->status = -ECANCELED; 1284 ep->ep_cb.rx(ep->target, packet); 1285 } else { 1286 htc_rxpkt_reset(packet); 1287 htc_add_rxbuf((void *)(target), packet); 1288 } 1289 } 1290 1291 static void reclaim_rx_ctrl_buf(struct htc_target *target, 1292 struct htc_packet *packet) 1293 { 1294 spin_lock_bh(&target->htc_lock); 1295 list_add_tail(&packet->list, &target->free_ctrl_rxbuf); 1296 spin_unlock_bh(&target->htc_lock); 1297 } 1298 1299 static int ath6kl_htc_rx_packet(struct htc_target *target, 1300 struct htc_packet *packet, 1301 u32 rx_len) 1302 { 1303 struct ath6kl_device *dev = target->dev; 1304 u32 padded_len; 1305 int status; 1306 1307 padded_len = CALC_TXRX_PADDED_LEN(target, rx_len); 1308 1309 if (padded_len > packet->buf_len) { 1310 ath6kl_err("not enough receive space for packet - padlen %d recvlen %d bufferlen %d\n", 1311 padded_len, rx_len, packet->buf_len); 1312 return -ENOMEM; 1313 } 1314 1315 ath6kl_dbg(ATH6KL_DBG_HTC, 1316 "htc rx 0x%p hdr 0x%x len %d mbox 0x%x\n", 1317 packet, packet->info.rx.exp_hdr, 1318 padded_len, dev->ar->mbox_info.htc_addr); 1319 1320 status = hif_read_write_sync(dev->ar, 1321 dev->ar->mbox_info.htc_addr, 1322 packet->buf, padded_len, 1323 HIF_RD_SYNC_BLOCK_FIX); 1324 1325 packet->status = status; 1326 1327 return status; 1328 } 1329 1330 /* 1331 * optimization for recv packets, we can indicate a 1332 * "hint" that there are more single-packets to fetch 1333 * on this endpoint. 1334 */ 1335 static void ath6kl_htc_rx_set_indicate(u32 lk_ahd, 1336 struct htc_endpoint *endpoint, 1337 struct htc_packet *packet) 1338 { 1339 struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)&lk_ahd; 1340 1341 if (htc_hdr->eid == packet->endpoint) { 1342 if (!list_empty(&endpoint->rx_bufq)) 1343 packet->info.rx.indicat_flags |= 1344 HTC_RX_FLAGS_INDICATE_MORE_PKTS; 1345 } 1346 } 1347 1348 static void ath6kl_htc_rx_chk_water_mark(struct htc_endpoint *endpoint) 1349 { 1350 struct htc_ep_callbacks ep_cb = endpoint->ep_cb; 1351 1352 if (ep_cb.rx_refill_thresh > 0) { 1353 spin_lock_bh(&endpoint->target->rx_lock); 1354 if (get_queue_depth(&endpoint->rx_bufq) 1355 < ep_cb.rx_refill_thresh) { 1356 spin_unlock_bh(&endpoint->target->rx_lock); 1357 ep_cb.rx_refill(endpoint->target, endpoint->eid); 1358 return; 1359 } 1360 spin_unlock_bh(&endpoint->target->rx_lock); 1361 } 1362 } 1363 1364 /* This function is called with rx_lock held */ 1365 static int ath6kl_htc_rx_setup(struct htc_target *target, 1366 struct htc_endpoint *ep, 1367 u32 *lk_ahds, struct list_head *queue, int n_msg) 1368 { 1369 struct htc_packet *packet; 1370 /* FIXME: type of lk_ahds can't be right */ 1371 struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)lk_ahds; 1372 struct htc_ep_callbacks ep_cb; 1373 int status = 0, j, full_len; 1374 bool no_recycle; 1375 1376 full_len = CALC_TXRX_PADDED_LEN(target, 1377 le16_to_cpu(htc_hdr->payld_len) + 1378 sizeof(*htc_hdr)); 1379 1380 if (!htc_valid_rx_frame_len(target, ep->eid, full_len)) { 1381 ath6kl_warn("Rx buffer requested with invalid length htc_hdr:eid %d, flags 0x%x, len %d\n", 1382 htc_hdr->eid, htc_hdr->flags, 1383 le16_to_cpu(htc_hdr->payld_len)); 1384 return -EINVAL; 1385 } 1386 1387 ep_cb = ep->ep_cb; 1388 for (j = 0; j < n_msg; j++) { 1389 /* 1390 * Reset flag, any packets allocated using the 1391 * rx_alloc() API cannot be recycled on 1392 * cleanup,they must be explicitly returned. 1393 */ 1394 no_recycle = false; 1395 1396 if (ep_cb.rx_allocthresh && 1397 (full_len > ep_cb.rx_alloc_thresh)) { 1398 ep->ep_st.rx_alloc_thresh_hit += 1; 1399 ep->ep_st.rxalloc_thresh_byte += 1400 le16_to_cpu(htc_hdr->payld_len); 1401 1402 spin_unlock_bh(&target->rx_lock); 1403 no_recycle = true; 1404 1405 packet = ep_cb.rx_allocthresh(ep->target, ep->eid, 1406 full_len); 1407 spin_lock_bh(&target->rx_lock); 1408 } else { 1409 /* refill handler is being used */ 1410 if (list_empty(&ep->rx_bufq)) { 1411 if (ep_cb.rx_refill) { 1412 spin_unlock_bh(&target->rx_lock); 1413 ep_cb.rx_refill(ep->target, ep->eid); 1414 spin_lock_bh(&target->rx_lock); 1415 } 1416 } 1417 1418 if (list_empty(&ep->rx_bufq)) { 1419 packet = NULL; 1420 } else { 1421 packet = list_first_entry(&ep->rx_bufq, 1422 struct htc_packet, list); 1423 list_del(&packet->list); 1424 } 1425 } 1426 1427 if (!packet) { 1428 target->rx_st_flags |= HTC_RECV_WAIT_BUFFERS; 1429 target->ep_waiting = ep->eid; 1430 return -ENOSPC; 1431 } 1432 1433 /* clear flags */ 1434 packet->info.rx.rx_flags = 0; 1435 packet->info.rx.indicat_flags = 0; 1436 packet->status = 0; 1437 1438 if (no_recycle) 1439 /* 1440 * flag that these packets cannot be 1441 * recycled, they have to be returned to 1442 * the user 1443 */ 1444 packet->info.rx.rx_flags |= HTC_RX_PKT_NO_RECYCLE; 1445 1446 /* Caller needs to free this upon any failure */ 1447 list_add_tail(&packet->list, queue); 1448 1449 if (target->htc_flags & HTC_OP_STATE_STOPPING) { 1450 status = -ECANCELED; 1451 break; 1452 } 1453 1454 if (j) { 1455 packet->info.rx.rx_flags |= HTC_RX_PKT_REFRESH_HDR; 1456 packet->info.rx.exp_hdr = 0xFFFFFFFF; 1457 } else 1458 /* set expected look ahead */ 1459 packet->info.rx.exp_hdr = *lk_ahds; 1460 1461 packet->act_len = le16_to_cpu(htc_hdr->payld_len) + 1462 HTC_HDR_LENGTH; 1463 } 1464 1465 return status; 1466 } 1467 1468 static int ath6kl_htc_rx_alloc(struct htc_target *target, 1469 u32 lk_ahds[], int msg, 1470 struct htc_endpoint *endpoint, 1471 struct list_head *queue) 1472 { 1473 int status = 0; 1474 struct htc_packet *packet, *tmp_pkt; 1475 struct htc_frame_hdr *htc_hdr; 1476 int i, n_msg; 1477 1478 spin_lock_bh(&target->rx_lock); 1479 1480 for (i = 0; i < msg; i++) { 1481 htc_hdr = (struct htc_frame_hdr *)&lk_ahds[i]; 1482 1483 if (htc_hdr->eid >= ENDPOINT_MAX) { 1484 ath6kl_err("invalid ep in look-ahead: %d\n", 1485 htc_hdr->eid); 1486 status = -ENOMEM; 1487 break; 1488 } 1489 1490 if (htc_hdr->eid != endpoint->eid) { 1491 ath6kl_err("invalid ep in look-ahead: %d should be : %d (index:%d)\n", 1492 htc_hdr->eid, endpoint->eid, i); 1493 status = -ENOMEM; 1494 break; 1495 } 1496 1497 if (le16_to_cpu(htc_hdr->payld_len) > HTC_MAX_PAYLOAD_LENGTH) { 1498 ath6kl_err("payload len %d exceeds max htc : %d !\n", 1499 htc_hdr->payld_len, 1500 (u32) HTC_MAX_PAYLOAD_LENGTH); 1501 status = -ENOMEM; 1502 break; 1503 } 1504 1505 if (endpoint->svc_id == 0) { 1506 ath6kl_err("ep %d is not connected !\n", htc_hdr->eid); 1507 status = -ENOMEM; 1508 break; 1509 } 1510 1511 if (htc_hdr->flags & HTC_FLG_RX_BNDL_CNT) { 1512 /* 1513 * HTC header indicates that every packet to follow 1514 * has the same padded length so that it can be 1515 * optimally fetched as a full bundle. 1516 */ 1517 n_msg = (htc_hdr->flags & HTC_FLG_RX_BNDL_CNT) >> 1518 HTC_FLG_RX_BNDL_CNT_S; 1519 1520 /* the count doesn't include the starter frame */ 1521 n_msg++; 1522 if (n_msg > target->msg_per_bndl_max) { 1523 status = -ENOMEM; 1524 break; 1525 } 1526 1527 endpoint->ep_st.rx_bundle_from_hdr += 1; 1528 ath6kl_dbg(ATH6KL_DBG_HTC, 1529 "htc rx bundle pkts %d\n", 1530 n_msg); 1531 } else 1532 /* HTC header only indicates 1 message to fetch */ 1533 n_msg = 1; 1534 1535 /* Setup packet buffers for each message */ 1536 status = ath6kl_htc_rx_setup(target, endpoint, &lk_ahds[i], 1537 queue, n_msg); 1538 1539 /* 1540 * This is due to unavailability of buffers to rx entire data. 1541 * Return no error so that free buffers from queue can be used 1542 * to receive partial data. 1543 */ 1544 if (status == -ENOSPC) { 1545 spin_unlock_bh(&target->rx_lock); 1546 return 0; 1547 } 1548 1549 if (status) 1550 break; 1551 } 1552 1553 spin_unlock_bh(&target->rx_lock); 1554 1555 if (status) { 1556 list_for_each_entry_safe(packet, tmp_pkt, queue, list) { 1557 list_del(&packet->list); 1558 htc_reclaim_rxbuf(target, packet, 1559 &target->endpoint[packet->endpoint]); 1560 } 1561 } 1562 1563 return status; 1564 } 1565 1566 static void htc_ctrl_rx(struct htc_target *context, struct htc_packet *packets) 1567 { 1568 if (packets->endpoint != ENDPOINT_0) { 1569 WARN_ON(1); 1570 return; 1571 } 1572 1573 if (packets->status == -ECANCELED) { 1574 reclaim_rx_ctrl_buf(context, packets); 1575 return; 1576 } 1577 1578 if (packets->act_len > 0) { 1579 ath6kl_err("htc_ctrl_rx, got message with len:%zu\n", 1580 packets->act_len + HTC_HDR_LENGTH); 1581 1582 ath6kl_dbg_dump(ATH6KL_DBG_HTC, 1583 "htc rx unexpected endpoint 0 message", "", 1584 packets->buf - HTC_HDR_LENGTH, 1585 packets->act_len + HTC_HDR_LENGTH); 1586 } 1587 1588 htc_reclaim_rxbuf(context, packets, &context->endpoint[0]); 1589 } 1590 1591 static void htc_proc_cred_rpt(struct htc_target *target, 1592 struct htc_credit_report *rpt, 1593 int n_entries, 1594 enum htc_endpoint_id from_ep) 1595 { 1596 struct htc_endpoint *endpoint; 1597 int tot_credits = 0, i; 1598 bool dist = false; 1599 1600 spin_lock_bh(&target->tx_lock); 1601 1602 for (i = 0; i < n_entries; i++, rpt++) { 1603 if (rpt->eid >= ENDPOINT_MAX) { 1604 WARN_ON(1); 1605 spin_unlock_bh(&target->tx_lock); 1606 return; 1607 } 1608 1609 endpoint = &target->endpoint[rpt->eid]; 1610 1611 ath6kl_dbg(ATH6KL_DBG_CREDIT, 1612 "credit report ep %d credits %d\n", 1613 rpt->eid, rpt->credits); 1614 1615 endpoint->ep_st.tx_cred_rpt += 1; 1616 endpoint->ep_st.cred_retnd += rpt->credits; 1617 1618 if (from_ep == rpt->eid) { 1619 /* 1620 * This credit report arrived on the same endpoint 1621 * indicating it arrived in an RX packet. 1622 */ 1623 endpoint->ep_st.cred_from_rx += rpt->credits; 1624 endpoint->ep_st.cred_rpt_from_rx += 1; 1625 } else if (from_ep == ENDPOINT_0) { 1626 /* credit arrived on endpoint 0 as a NULL message */ 1627 endpoint->ep_st.cred_from_ep0 += rpt->credits; 1628 endpoint->ep_st.cred_rpt_ep0 += 1; 1629 } else { 1630 endpoint->ep_st.cred_from_other += rpt->credits; 1631 endpoint->ep_st.cred_rpt_from_other += 1; 1632 } 1633 1634 if (rpt->eid == ENDPOINT_0) 1635 /* always give endpoint 0 credits back */ 1636 endpoint->cred_dist.credits += rpt->credits; 1637 else { 1638 endpoint->cred_dist.cred_to_dist += rpt->credits; 1639 dist = true; 1640 } 1641 1642 /* 1643 * Refresh tx depth for distribution function that will 1644 * recover these credits NOTE: this is only valid when 1645 * there are credits to recover! 1646 */ 1647 endpoint->cred_dist.txq_depth = 1648 get_queue_depth(&endpoint->txq); 1649 1650 tot_credits += rpt->credits; 1651 } 1652 1653 if (dist) { 1654 /* 1655 * This was a credit return based on a completed send 1656 * operations note, this is done with the lock held 1657 */ 1658 ath6kl_credit_distribute(target->credit_info, 1659 &target->cred_dist_list, 1660 HTC_CREDIT_DIST_SEND_COMPLETE); 1661 } 1662 1663 spin_unlock_bh(&target->tx_lock); 1664 1665 if (tot_credits) 1666 htc_chk_ep_txq(target); 1667 } 1668 1669 static int htc_parse_trailer(struct htc_target *target, 1670 struct htc_record_hdr *record, 1671 u8 *record_buf, u32 *next_lk_ahds, 1672 enum htc_endpoint_id endpoint, 1673 int *n_lk_ahds) 1674 { 1675 struct htc_bundle_lkahd_rpt *bundle_lkahd_rpt; 1676 struct htc_lookahead_report *lk_ahd; 1677 int len; 1678 1679 switch (record->rec_id) { 1680 case HTC_RECORD_CREDITS: 1681 len = record->len / sizeof(struct htc_credit_report); 1682 if (!len) { 1683 WARN_ON(1); 1684 return -EINVAL; 1685 } 1686 1687 htc_proc_cred_rpt(target, 1688 (struct htc_credit_report *) record_buf, 1689 len, endpoint); 1690 break; 1691 case HTC_RECORD_LOOKAHEAD: 1692 len = record->len / sizeof(*lk_ahd); 1693 if (!len) { 1694 WARN_ON(1); 1695 return -EINVAL; 1696 } 1697 1698 lk_ahd = (struct htc_lookahead_report *) record_buf; 1699 if ((lk_ahd->pre_valid == ((~lk_ahd->post_valid) & 0xFF)) && 1700 next_lk_ahds) { 1701 ath6kl_dbg(ATH6KL_DBG_HTC, 1702 "htc rx lk_ahd found pre_valid 0x%x post_valid 0x%x\n", 1703 lk_ahd->pre_valid, lk_ahd->post_valid); 1704 1705 /* look ahead bytes are valid, copy them over */ 1706 memcpy((u8 *)&next_lk_ahds[0], lk_ahd->lk_ahd, 4); 1707 1708 ath6kl_dbg_dump(ATH6KL_DBG_HTC, 1709 "htc rx next look ahead", 1710 "", next_lk_ahds, 4); 1711 1712 *n_lk_ahds = 1; 1713 } 1714 break; 1715 case HTC_RECORD_LOOKAHEAD_BUNDLE: 1716 len = record->len / sizeof(*bundle_lkahd_rpt); 1717 if (!len || (len > HTC_HOST_MAX_MSG_PER_BUNDLE)) { 1718 WARN_ON(1); 1719 return -EINVAL; 1720 } 1721 1722 if (next_lk_ahds) { 1723 int i; 1724 1725 bundle_lkahd_rpt = 1726 (struct htc_bundle_lkahd_rpt *) record_buf; 1727 1728 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bundle lk_ahd", 1729 "", record_buf, record->len); 1730 1731 for (i = 0; i < len; i++) { 1732 memcpy((u8 *)&next_lk_ahds[i], 1733 bundle_lkahd_rpt->lk_ahd, 4); 1734 bundle_lkahd_rpt++; 1735 } 1736 1737 *n_lk_ahds = i; 1738 } 1739 break; 1740 default: 1741 ath6kl_err("unhandled record: id:%d len:%d\n", 1742 record->rec_id, record->len); 1743 break; 1744 } 1745 1746 return 0; 1747 } 1748 1749 static int htc_proc_trailer(struct htc_target *target, 1750 u8 *buf, int len, u32 *next_lk_ahds, 1751 int *n_lk_ahds, enum htc_endpoint_id endpoint) 1752 { 1753 struct htc_record_hdr *record; 1754 int orig_len; 1755 int status; 1756 u8 *record_buf; 1757 u8 *orig_buf; 1758 1759 ath6kl_dbg(ATH6KL_DBG_HTC, "htc rx trailer len %d\n", len); 1760 ath6kl_dbg_dump(ATH6KL_DBG_HTC, NULL, "", buf, len); 1761 1762 orig_buf = buf; 1763 orig_len = len; 1764 status = 0; 1765 1766 while (len > 0) { 1767 if (len < sizeof(struct htc_record_hdr)) { 1768 status = -ENOMEM; 1769 break; 1770 } 1771 /* these are byte aligned structs */ 1772 record = (struct htc_record_hdr *) buf; 1773 len -= sizeof(struct htc_record_hdr); 1774 buf += sizeof(struct htc_record_hdr); 1775 1776 if (record->len > len) { 1777 ath6kl_err("invalid record len: %d (id:%d) buf has: %d bytes left\n", 1778 record->len, record->rec_id, len); 1779 status = -ENOMEM; 1780 break; 1781 } 1782 record_buf = buf; 1783 1784 status = htc_parse_trailer(target, record, record_buf, 1785 next_lk_ahds, endpoint, n_lk_ahds); 1786 1787 if (status) 1788 break; 1789 1790 /* advance buffer past this record for next time around */ 1791 buf += record->len; 1792 len -= record->len; 1793 } 1794 1795 if (status) 1796 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bad trailer", 1797 "", orig_buf, orig_len); 1798 1799 return status; 1800 } 1801 1802 static int ath6kl_htc_rx_process_hdr(struct htc_target *target, 1803 struct htc_packet *packet, 1804 u32 *next_lkahds, int *n_lkahds) 1805 { 1806 int status = 0; 1807 u16 payload_len; 1808 u32 lk_ahd; 1809 struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)packet->buf; 1810 1811 if (n_lkahds != NULL) 1812 *n_lkahds = 0; 1813 1814 /* 1815 * NOTE: we cannot assume the alignment of buf, so we use the safe 1816 * macros to retrieve 16 bit fields. 1817 */ 1818 payload_len = le16_to_cpu(get_unaligned(&htc_hdr->payld_len)); 1819 1820 memcpy((u8 *)&lk_ahd, packet->buf, sizeof(lk_ahd)); 1821 1822 if (packet->info.rx.rx_flags & HTC_RX_PKT_REFRESH_HDR) { 1823 /* 1824 * Refresh the expected header and the actual length as it 1825 * was unknown when this packet was grabbed as part of the 1826 * bundle. 1827 */ 1828 packet->info.rx.exp_hdr = lk_ahd; 1829 packet->act_len = payload_len + HTC_HDR_LENGTH; 1830 1831 /* validate the actual header that was refreshed */ 1832 if (packet->act_len > packet->buf_len) { 1833 ath6kl_err("refreshed hdr payload len (%d) in bundled recv is invalid (hdr: 0x%X)\n", 1834 payload_len, lk_ahd); 1835 /* 1836 * Limit this to max buffer just to print out some 1837 * of the buffer. 1838 */ 1839 packet->act_len = min(packet->act_len, packet->buf_len); 1840 status = -ENOMEM; 1841 goto fail_rx; 1842 } 1843 1844 if (packet->endpoint != htc_hdr->eid) { 1845 ath6kl_err("refreshed hdr ep (%d) does not match expected ep (%d)\n", 1846 htc_hdr->eid, packet->endpoint); 1847 status = -ENOMEM; 1848 goto fail_rx; 1849 } 1850 } 1851 1852 if (lk_ahd != packet->info.rx.exp_hdr) { 1853 ath6kl_err("%s(): lk_ahd mismatch! (pPkt:0x%p flags:0x%X)\n", 1854 __func__, packet, packet->info.rx.rx_flags); 1855 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx expected lk_ahd", 1856 "", &packet->info.rx.exp_hdr, 4); 1857 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx current header", 1858 "", (u8 *)&lk_ahd, sizeof(lk_ahd)); 1859 status = -ENOMEM; 1860 goto fail_rx; 1861 } 1862 1863 if (htc_hdr->flags & HTC_FLG_RX_TRAILER) { 1864 if (htc_hdr->ctrl[0] < sizeof(struct htc_record_hdr) || 1865 htc_hdr->ctrl[0] > payload_len) { 1866 ath6kl_err("%s(): invalid hdr (payload len should be :%d, CB[0] is:%d)\n", 1867 __func__, payload_len, htc_hdr->ctrl[0]); 1868 status = -ENOMEM; 1869 goto fail_rx; 1870 } 1871 1872 if (packet->info.rx.rx_flags & HTC_RX_PKT_IGNORE_LOOKAHEAD) { 1873 next_lkahds = NULL; 1874 n_lkahds = NULL; 1875 } 1876 1877 status = htc_proc_trailer(target, packet->buf + HTC_HDR_LENGTH 1878 + payload_len - htc_hdr->ctrl[0], 1879 htc_hdr->ctrl[0], next_lkahds, 1880 n_lkahds, packet->endpoint); 1881 1882 if (status) 1883 goto fail_rx; 1884 1885 packet->act_len -= htc_hdr->ctrl[0]; 1886 } 1887 1888 packet->buf += HTC_HDR_LENGTH; 1889 packet->act_len -= HTC_HDR_LENGTH; 1890 1891 fail_rx: 1892 if (status) 1893 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bad packet", 1894 "", packet->buf, packet->act_len); 1895 1896 return status; 1897 } 1898 1899 static void ath6kl_htc_rx_complete(struct htc_endpoint *endpoint, 1900 struct htc_packet *packet) 1901 { 1902 ath6kl_dbg(ATH6KL_DBG_HTC, 1903 "htc rx complete ep %d packet 0x%p\n", 1904 endpoint->eid, packet); 1905 1906 endpoint->ep_cb.rx(endpoint->target, packet); 1907 } 1908 1909 static int ath6kl_htc_rx_bundle(struct htc_target *target, 1910 struct list_head *rxq, 1911 struct list_head *sync_compq, 1912 int *n_pkt_fetched, bool part_bundle) 1913 { 1914 struct hif_scatter_req *scat_req; 1915 struct htc_packet *packet; 1916 int rem_space = target->max_rx_bndl_sz; 1917 int n_scat_pkt, status = 0, i, len; 1918 1919 n_scat_pkt = get_queue_depth(rxq); 1920 n_scat_pkt = min(n_scat_pkt, target->msg_per_bndl_max); 1921 1922 if ((get_queue_depth(rxq) - n_scat_pkt) > 0) { 1923 /* 1924 * We were forced to split this bundle receive operation 1925 * all packets in this partial bundle must have their 1926 * lookaheads ignored. 1927 */ 1928 part_bundle = true; 1929 1930 /* 1931 * This would only happen if the target ignored our max 1932 * bundle limit. 1933 */ 1934 ath6kl_warn("%s(): partial bundle detected num:%d , %d\n", 1935 __func__, get_queue_depth(rxq), n_scat_pkt); 1936 } 1937 1938 len = 0; 1939 1940 ath6kl_dbg(ATH6KL_DBG_HTC, 1941 "htc rx bundle depth %d pkts %d\n", 1942 get_queue_depth(rxq), n_scat_pkt); 1943 1944 scat_req = hif_scatter_req_get(target->dev->ar); 1945 1946 if (scat_req == NULL) 1947 goto fail_rx_pkt; 1948 1949 for (i = 0; i < n_scat_pkt; i++) { 1950 int pad_len; 1951 1952 packet = list_first_entry(rxq, struct htc_packet, list); 1953 list_del(&packet->list); 1954 1955 pad_len = CALC_TXRX_PADDED_LEN(target, 1956 packet->act_len); 1957 1958 if ((rem_space - pad_len) < 0) { 1959 list_add(&packet->list, rxq); 1960 break; 1961 } 1962 1963 rem_space -= pad_len; 1964 1965 if (part_bundle || (i < (n_scat_pkt - 1))) 1966 /* 1967 * Packet 0..n-1 cannot be checked for look-aheads 1968 * since we are fetching a bundle the last packet 1969 * however can have it's lookahead used 1970 */ 1971 packet->info.rx.rx_flags |= 1972 HTC_RX_PKT_IGNORE_LOOKAHEAD; 1973 1974 /* NOTE: 1 HTC packet per scatter entry */ 1975 scat_req->scat_list[i].buf = packet->buf; 1976 scat_req->scat_list[i].len = pad_len; 1977 1978 packet->info.rx.rx_flags |= HTC_RX_PKT_PART_OF_BUNDLE; 1979 1980 list_add_tail(&packet->list, sync_compq); 1981 1982 WARN_ON(!scat_req->scat_list[i].len); 1983 len += scat_req->scat_list[i].len; 1984 } 1985 1986 scat_req->len = len; 1987 scat_req->scat_entries = i; 1988 1989 status = ath6kl_hif_submit_scat_req(target->dev, scat_req, true); 1990 1991 if (!status) 1992 *n_pkt_fetched = i; 1993 1994 /* free scatter request */ 1995 hif_scatter_req_add(target->dev->ar, scat_req); 1996 1997 fail_rx_pkt: 1998 1999 return status; 2000 } 2001 2002 static int ath6kl_htc_rx_process_packets(struct htc_target *target, 2003 struct list_head *comp_pktq, 2004 u32 lk_ahds[], 2005 int *n_lk_ahd) 2006 { 2007 struct htc_packet *packet, *tmp_pkt; 2008 struct htc_endpoint *ep; 2009 int status = 0; 2010 2011 list_for_each_entry_safe(packet, tmp_pkt, comp_pktq, list) { 2012 ep = &target->endpoint[packet->endpoint]; 2013 2014 trace_ath6kl_htc_rx(packet->status, packet->endpoint, 2015 packet->buf, packet->act_len); 2016 2017 /* process header for each of the recv packet */ 2018 status = ath6kl_htc_rx_process_hdr(target, packet, lk_ahds, 2019 n_lk_ahd); 2020 if (status) 2021 return status; 2022 2023 list_del(&packet->list); 2024 2025 if (list_empty(comp_pktq)) { 2026 /* 2027 * Last packet's more packet flag is set 2028 * based on the lookahead. 2029 */ 2030 if (*n_lk_ahd > 0) 2031 ath6kl_htc_rx_set_indicate(lk_ahds[0], 2032 ep, packet); 2033 } else 2034 /* 2035 * Packets in a bundle automatically have 2036 * this flag set. 2037 */ 2038 packet->info.rx.indicat_flags |= 2039 HTC_RX_FLAGS_INDICATE_MORE_PKTS; 2040 2041 ath6kl_htc_rx_update_stats(ep, *n_lk_ahd); 2042 2043 if (packet->info.rx.rx_flags & HTC_RX_PKT_PART_OF_BUNDLE) 2044 ep->ep_st.rx_bundl += 1; 2045 2046 ath6kl_htc_rx_complete(ep, packet); 2047 } 2048 2049 return status; 2050 } 2051 2052 static int ath6kl_htc_rx_fetch(struct htc_target *target, 2053 struct list_head *rx_pktq, 2054 struct list_head *comp_pktq) 2055 { 2056 int fetched_pkts; 2057 bool part_bundle = false; 2058 int status = 0; 2059 struct list_head tmp_rxq; 2060 struct htc_packet *packet, *tmp_pkt; 2061 2062 /* now go fetch the list of HTC packets */ 2063 while (!list_empty(rx_pktq)) { 2064 fetched_pkts = 0; 2065 2066 INIT_LIST_HEAD(&tmp_rxq); 2067 2068 if (target->rx_bndl_enable && (get_queue_depth(rx_pktq) > 1)) { 2069 /* 2070 * There are enough packets to attempt a 2071 * bundle transfer and recv bundling is 2072 * allowed. 2073 */ 2074 status = ath6kl_htc_rx_bundle(target, rx_pktq, 2075 &tmp_rxq, 2076 &fetched_pkts, 2077 part_bundle); 2078 if (status) 2079 goto fail_rx; 2080 2081 if (!list_empty(rx_pktq)) 2082 part_bundle = true; 2083 2084 list_splice_tail_init(&tmp_rxq, comp_pktq); 2085 } 2086 2087 if (!fetched_pkts) { 2088 packet = list_first_entry(rx_pktq, struct htc_packet, 2089 list); 2090 2091 /* fully synchronous */ 2092 packet->completion = NULL; 2093 2094 if (!list_is_singular(rx_pktq)) 2095 /* 2096 * look_aheads in all packet 2097 * except the last one in the 2098 * bundle must be ignored 2099 */ 2100 packet->info.rx.rx_flags |= 2101 HTC_RX_PKT_IGNORE_LOOKAHEAD; 2102 2103 /* go fetch the packet */ 2104 status = ath6kl_htc_rx_packet(target, packet, 2105 packet->act_len); 2106 2107 list_move_tail(&packet->list, &tmp_rxq); 2108 2109 if (status) 2110 goto fail_rx; 2111 2112 list_splice_tail_init(&tmp_rxq, comp_pktq); 2113 } 2114 } 2115 2116 return 0; 2117 2118 fail_rx: 2119 2120 /* 2121 * Cleanup any packets we allocated but didn't use to 2122 * actually fetch any packets. 2123 */ 2124 2125 list_for_each_entry_safe(packet, tmp_pkt, rx_pktq, list) { 2126 list_del(&packet->list); 2127 htc_reclaim_rxbuf(target, packet, 2128 &target->endpoint[packet->endpoint]); 2129 } 2130 2131 list_for_each_entry_safe(packet, tmp_pkt, &tmp_rxq, list) { 2132 list_del(&packet->list); 2133 htc_reclaim_rxbuf(target, packet, 2134 &target->endpoint[packet->endpoint]); 2135 } 2136 2137 return status; 2138 } 2139 2140 int ath6kl_htc_rxmsg_pending_handler(struct htc_target *target, 2141 u32 msg_look_ahead, int *num_pkts) 2142 { 2143 struct htc_packet *packets, *tmp_pkt; 2144 struct htc_endpoint *endpoint; 2145 struct list_head rx_pktq, comp_pktq; 2146 int status = 0; 2147 u32 look_aheads[HTC_HOST_MAX_MSG_PER_BUNDLE]; 2148 int num_look_ahead = 1; 2149 enum htc_endpoint_id id; 2150 int n_fetched = 0; 2151 2152 INIT_LIST_HEAD(&comp_pktq); 2153 *num_pkts = 0; 2154 2155 /* 2156 * On first entry copy the look_aheads into our temp array for 2157 * processing 2158 */ 2159 look_aheads[0] = msg_look_ahead; 2160 2161 while (true) { 2162 /* 2163 * First lookahead sets the expected endpoint IDs for all 2164 * packets in a bundle. 2165 */ 2166 id = ((struct htc_frame_hdr *)&look_aheads[0])->eid; 2167 endpoint = &target->endpoint[id]; 2168 2169 if (id >= ENDPOINT_MAX) { 2170 ath6kl_err("MsgPend, invalid endpoint in look-ahead: %d\n", 2171 id); 2172 status = -ENOMEM; 2173 break; 2174 } 2175 2176 INIT_LIST_HEAD(&rx_pktq); 2177 INIT_LIST_HEAD(&comp_pktq); 2178 2179 /* 2180 * Try to allocate as many HTC RX packets indicated by the 2181 * look_aheads. 2182 */ 2183 status = ath6kl_htc_rx_alloc(target, look_aheads, 2184 num_look_ahead, endpoint, 2185 &rx_pktq); 2186 if (status) 2187 break; 2188 2189 if (get_queue_depth(&rx_pktq) >= 2) 2190 /* 2191 * A recv bundle was detected, force IRQ status 2192 * re-check again 2193 */ 2194 target->chk_irq_status_cnt = 1; 2195 2196 n_fetched += get_queue_depth(&rx_pktq); 2197 2198 num_look_ahead = 0; 2199 2200 status = ath6kl_htc_rx_fetch(target, &rx_pktq, &comp_pktq); 2201 2202 if (!status) 2203 ath6kl_htc_rx_chk_water_mark(endpoint); 2204 2205 /* Process fetched packets */ 2206 status = ath6kl_htc_rx_process_packets(target, &comp_pktq, 2207 look_aheads, 2208 &num_look_ahead); 2209 2210 if (!num_look_ahead || status) 2211 break; 2212 2213 /* 2214 * For SYNCH processing, if we get here, we are running 2215 * through the loop again due to a detected lookahead. Set 2216 * flag that we should re-check IRQ status registers again 2217 * before leaving IRQ processing, this can net better 2218 * performance in high throughput situations. 2219 */ 2220 target->chk_irq_status_cnt = 1; 2221 } 2222 2223 if (status) { 2224 if (status != -ECANCELED) 2225 ath6kl_err("failed to get pending recv messages: %d\n", 2226 status); 2227 2228 /* cleanup any packets in sync completion queue */ 2229 list_for_each_entry_safe(packets, tmp_pkt, &comp_pktq, list) { 2230 list_del(&packets->list); 2231 htc_reclaim_rxbuf(target, packets, 2232 &target->endpoint[packets->endpoint]); 2233 } 2234 2235 if (target->htc_flags & HTC_OP_STATE_STOPPING) { 2236 ath6kl_warn("host is going to stop blocking receiver for htc_stop\n"); 2237 ath6kl_hif_rx_control(target->dev, false); 2238 } 2239 } 2240 2241 /* 2242 * Before leaving, check to see if host ran out of buffers and 2243 * needs to stop the receiver. 2244 */ 2245 if (target->rx_st_flags & HTC_RECV_WAIT_BUFFERS) { 2246 ath6kl_warn("host has no rx buffers blocking receiver to prevent overrun\n"); 2247 ath6kl_hif_rx_control(target->dev, false); 2248 } 2249 *num_pkts = n_fetched; 2250 2251 return status; 2252 } 2253 2254 /* 2255 * Synchronously wait for a control message from the target, 2256 * This function is used at initialization time ONLY. At init messages 2257 * on ENDPOINT 0 are expected. 2258 */ 2259 static struct htc_packet *htc_wait_for_ctrl_msg(struct htc_target *target) 2260 { 2261 struct htc_packet *packet = NULL; 2262 struct htc_frame_look_ahead look_ahead; 2263 2264 if (ath6kl_hif_poll_mboxmsg_rx(target->dev, &look_ahead.word, 2265 HTC_TARGET_RESPONSE_TIMEOUT)) 2266 return NULL; 2267 2268 ath6kl_dbg(ATH6KL_DBG_HTC, 2269 "htc rx wait ctrl look_ahead 0x%X\n", look_ahead.word); 2270 2271 if (look_ahead.eid != ENDPOINT_0) 2272 return NULL; 2273 2274 packet = htc_get_control_buf(target, false); 2275 2276 if (!packet) 2277 return NULL; 2278 2279 packet->info.rx.rx_flags = 0; 2280 packet->info.rx.exp_hdr = look_ahead.word; 2281 packet->act_len = le16_to_cpu(look_ahead.payld_len) + HTC_HDR_LENGTH; 2282 2283 if (packet->act_len > packet->buf_len) 2284 goto fail_ctrl_rx; 2285 2286 /* we want synchronous operation */ 2287 packet->completion = NULL; 2288 2289 /* get the message from the device, this will block */ 2290 if (ath6kl_htc_rx_packet(target, packet, packet->act_len)) 2291 goto fail_ctrl_rx; 2292 2293 trace_ath6kl_htc_rx(packet->status, packet->endpoint, 2294 packet->buf, packet->act_len); 2295 2296 /* process receive header */ 2297 packet->status = ath6kl_htc_rx_process_hdr(target, packet, NULL, NULL); 2298 2299 if (packet->status) { 2300 ath6kl_err("htc_wait_for_ctrl_msg, ath6kl_htc_rx_process_hdr failed (status = %d)\n", 2301 packet->status); 2302 goto fail_ctrl_rx; 2303 } 2304 2305 return packet; 2306 2307 fail_ctrl_rx: 2308 if (packet != NULL) { 2309 htc_rxpkt_reset(packet); 2310 reclaim_rx_ctrl_buf(target, packet); 2311 } 2312 2313 return NULL; 2314 } 2315 2316 static int ath6kl_htc_mbox_add_rxbuf_multiple(struct htc_target *target, 2317 struct list_head *pkt_queue) 2318 { 2319 struct htc_endpoint *endpoint; 2320 struct htc_packet *first_pkt; 2321 bool rx_unblock = false; 2322 int status = 0, depth; 2323 2324 if (list_empty(pkt_queue)) 2325 return -ENOMEM; 2326 2327 first_pkt = list_first_entry(pkt_queue, struct htc_packet, list); 2328 2329 if (first_pkt->endpoint >= ENDPOINT_MAX) 2330 return status; 2331 2332 depth = get_queue_depth(pkt_queue); 2333 2334 ath6kl_dbg(ATH6KL_DBG_HTC, 2335 "htc rx add multiple ep id %d cnt %d len %d\n", 2336 first_pkt->endpoint, depth, first_pkt->buf_len); 2337 2338 endpoint = &target->endpoint[first_pkt->endpoint]; 2339 2340 if (target->htc_flags & HTC_OP_STATE_STOPPING) { 2341 struct htc_packet *packet, *tmp_pkt; 2342 2343 /* walk through queue and mark each one canceled */ 2344 list_for_each_entry_safe(packet, tmp_pkt, pkt_queue, list) { 2345 packet->status = -ECANCELED; 2346 list_del(&packet->list); 2347 ath6kl_htc_rx_complete(endpoint, packet); 2348 } 2349 2350 return status; 2351 } 2352 2353 spin_lock_bh(&target->rx_lock); 2354 2355 list_splice_tail_init(pkt_queue, &endpoint->rx_bufq); 2356 2357 /* check if we are blocked waiting for a new buffer */ 2358 if (target->rx_st_flags & HTC_RECV_WAIT_BUFFERS) { 2359 if (target->ep_waiting == first_pkt->endpoint) { 2360 ath6kl_dbg(ATH6KL_DBG_HTC, 2361 "htc rx blocked on ep %d, unblocking\n", 2362 target->ep_waiting); 2363 target->rx_st_flags &= ~HTC_RECV_WAIT_BUFFERS; 2364 target->ep_waiting = ENDPOINT_MAX; 2365 rx_unblock = true; 2366 } 2367 } 2368 2369 spin_unlock_bh(&target->rx_lock); 2370 2371 if (rx_unblock && !(target->htc_flags & HTC_OP_STATE_STOPPING)) 2372 /* TODO : implement a buffer threshold count? */ 2373 ath6kl_hif_rx_control(target->dev, true); 2374 2375 return status; 2376 } 2377 2378 static void ath6kl_htc_mbox_flush_rx_buf(struct htc_target *target) 2379 { 2380 struct htc_endpoint *endpoint; 2381 struct htc_packet *packet, *tmp_pkt; 2382 int i; 2383 2384 for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) { 2385 endpoint = &target->endpoint[i]; 2386 if (!endpoint->svc_id) 2387 /* not in use.. */ 2388 continue; 2389 2390 spin_lock_bh(&target->rx_lock); 2391 list_for_each_entry_safe(packet, tmp_pkt, 2392 &endpoint->rx_bufq, list) { 2393 list_del(&packet->list); 2394 spin_unlock_bh(&target->rx_lock); 2395 ath6kl_dbg(ATH6KL_DBG_HTC, 2396 "htc rx flush pkt 0x%p len %d ep %d\n", 2397 packet, packet->buf_len, 2398 packet->endpoint); 2399 /* 2400 * packets in rx_bufq of endpoint 0 have originally 2401 * been queued from target->free_ctrl_rxbuf where 2402 * packet and packet->buf_start are allocated 2403 * separately using kmalloc(). For other endpoint 2404 * rx_bufq, it is allocated as skb where packet is 2405 * skb->head. Take care of this difference while freeing 2406 * the memory. 2407 */ 2408 if (packet->endpoint == ENDPOINT_0) { 2409 kfree(packet->buf_start); 2410 kfree(packet); 2411 } else { 2412 dev_kfree_skb(packet->pkt_cntxt); 2413 } 2414 spin_lock_bh(&target->rx_lock); 2415 } 2416 spin_unlock_bh(&target->rx_lock); 2417 } 2418 } 2419 2420 static int ath6kl_htc_mbox_conn_service(struct htc_target *target, 2421 struct htc_service_connect_req *conn_req, 2422 struct htc_service_connect_resp *conn_resp) 2423 { 2424 struct htc_packet *rx_pkt = NULL; 2425 struct htc_packet *tx_pkt = NULL; 2426 struct htc_conn_service_resp *resp_msg; 2427 struct htc_conn_service_msg *conn_msg; 2428 struct htc_endpoint *endpoint; 2429 enum htc_endpoint_id assigned_ep = ENDPOINT_MAX; 2430 unsigned int max_msg_sz = 0; 2431 int status = 0; 2432 u16 msg_id; 2433 2434 ath6kl_dbg(ATH6KL_DBG_HTC, 2435 "htc connect service target 0x%p service id 0x%x\n", 2436 target, conn_req->svc_id); 2437 2438 if (conn_req->svc_id == HTC_CTRL_RSVD_SVC) { 2439 /* special case for pseudo control service */ 2440 assigned_ep = ENDPOINT_0; 2441 max_msg_sz = HTC_MAX_CTRL_MSG_LEN; 2442 } else { 2443 /* allocate a packet to send to the target */ 2444 tx_pkt = htc_get_control_buf(target, true); 2445 2446 if (!tx_pkt) 2447 return -ENOMEM; 2448 2449 conn_msg = (struct htc_conn_service_msg *)tx_pkt->buf; 2450 memset(conn_msg, 0, sizeof(*conn_msg)); 2451 conn_msg->msg_id = cpu_to_le16(HTC_MSG_CONN_SVC_ID); 2452 conn_msg->svc_id = cpu_to_le16(conn_req->svc_id); 2453 conn_msg->conn_flags = cpu_to_le16(conn_req->conn_flags); 2454 2455 set_htc_pkt_info(tx_pkt, NULL, (u8 *) conn_msg, 2456 sizeof(*conn_msg) + conn_msg->svc_meta_len, 2457 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG); 2458 2459 /* we want synchronous operation */ 2460 tx_pkt->completion = NULL; 2461 ath6kl_htc_tx_prep_pkt(tx_pkt, 0, 0, 0); 2462 status = ath6kl_htc_tx_issue(target, tx_pkt); 2463 2464 if (status) 2465 goto fail_tx; 2466 2467 /* wait for response */ 2468 rx_pkt = htc_wait_for_ctrl_msg(target); 2469 2470 if (!rx_pkt) { 2471 status = -ENOMEM; 2472 goto fail_tx; 2473 } 2474 2475 resp_msg = (struct htc_conn_service_resp *)rx_pkt->buf; 2476 msg_id = le16_to_cpu(resp_msg->msg_id); 2477 2478 if ((msg_id != HTC_MSG_CONN_SVC_RESP_ID) || 2479 (rx_pkt->act_len < sizeof(*resp_msg))) { 2480 status = -ENOMEM; 2481 goto fail_tx; 2482 } 2483 2484 conn_resp->resp_code = resp_msg->status; 2485 /* check response status */ 2486 if (resp_msg->status != HTC_SERVICE_SUCCESS) { 2487 ath6kl_err("target failed service 0x%X connect request (status:%d)\n", 2488 resp_msg->svc_id, resp_msg->status); 2489 status = -ENOMEM; 2490 goto fail_tx; 2491 } 2492 2493 assigned_ep = (enum htc_endpoint_id)resp_msg->eid; 2494 max_msg_sz = le16_to_cpu(resp_msg->max_msg_sz); 2495 } 2496 2497 if (WARN_ON_ONCE(assigned_ep == ENDPOINT_UNUSED || 2498 assigned_ep >= ENDPOINT_MAX || !max_msg_sz)) { 2499 status = -ENOMEM; 2500 goto fail_tx; 2501 } 2502 2503 endpoint = &target->endpoint[assigned_ep]; 2504 endpoint->eid = assigned_ep; 2505 if (endpoint->svc_id) { 2506 status = -ENOMEM; 2507 goto fail_tx; 2508 } 2509 2510 /* return assigned endpoint to caller */ 2511 conn_resp->endpoint = assigned_ep; 2512 conn_resp->len_max = max_msg_sz; 2513 2514 /* setup the endpoint */ 2515 2516 /* this marks the endpoint in use */ 2517 endpoint->svc_id = conn_req->svc_id; 2518 2519 endpoint->max_txq_depth = conn_req->max_txq_depth; 2520 endpoint->len_max = max_msg_sz; 2521 endpoint->ep_cb = conn_req->ep_cb; 2522 endpoint->cred_dist.svc_id = conn_req->svc_id; 2523 endpoint->cred_dist.htc_ep = endpoint; 2524 endpoint->cred_dist.endpoint = assigned_ep; 2525 endpoint->cred_dist.cred_sz = target->tgt_cred_sz; 2526 2527 switch (endpoint->svc_id) { 2528 case WMI_DATA_BK_SVC: 2529 endpoint->tx_drop_packet_threshold = MAX_DEF_COOKIE_NUM / 3; 2530 break; 2531 default: 2532 endpoint->tx_drop_packet_threshold = MAX_HI_COOKIE_NUM; 2533 break; 2534 } 2535 2536 if (conn_req->max_rxmsg_sz) { 2537 /* 2538 * Override cred_per_msg calculation, this optimizes 2539 * the credit-low indications since the host will actually 2540 * issue smaller messages in the Send path. 2541 */ 2542 if (conn_req->max_rxmsg_sz > max_msg_sz) { 2543 status = -ENOMEM; 2544 goto fail_tx; 2545 } 2546 endpoint->cred_dist.cred_per_msg = 2547 conn_req->max_rxmsg_sz / target->tgt_cred_sz; 2548 } else 2549 endpoint->cred_dist.cred_per_msg = 2550 max_msg_sz / target->tgt_cred_sz; 2551 2552 if (!endpoint->cred_dist.cred_per_msg) 2553 endpoint->cred_dist.cred_per_msg = 1; 2554 2555 /* save local connection flags */ 2556 endpoint->conn_flags = conn_req->flags; 2557 2558 fail_tx: 2559 if (tx_pkt) 2560 htc_reclaim_txctrl_buf(target, tx_pkt); 2561 2562 if (rx_pkt) { 2563 htc_rxpkt_reset(rx_pkt); 2564 reclaim_rx_ctrl_buf(target, rx_pkt); 2565 } 2566 2567 return status; 2568 } 2569 2570 static void reset_ep_state(struct htc_target *target) 2571 { 2572 struct htc_endpoint *endpoint; 2573 int i; 2574 2575 for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) { 2576 endpoint = &target->endpoint[i]; 2577 memset(&endpoint->cred_dist, 0, sizeof(endpoint->cred_dist)); 2578 endpoint->svc_id = 0; 2579 endpoint->len_max = 0; 2580 endpoint->max_txq_depth = 0; 2581 memset(&endpoint->ep_st, 0, 2582 sizeof(endpoint->ep_st)); 2583 INIT_LIST_HEAD(&endpoint->rx_bufq); 2584 INIT_LIST_HEAD(&endpoint->txq); 2585 endpoint->target = target; 2586 } 2587 2588 /* reset distribution list */ 2589 /* FIXME: free existing entries */ 2590 INIT_LIST_HEAD(&target->cred_dist_list); 2591 } 2592 2593 static int ath6kl_htc_mbox_get_rxbuf_num(struct htc_target *target, 2594 enum htc_endpoint_id endpoint) 2595 { 2596 int num; 2597 2598 spin_lock_bh(&target->rx_lock); 2599 num = get_queue_depth(&(target->endpoint[endpoint].rx_bufq)); 2600 spin_unlock_bh(&target->rx_lock); 2601 return num; 2602 } 2603 2604 static void htc_setup_msg_bndl(struct htc_target *target) 2605 { 2606 /* limit what HTC can handle */ 2607 target->msg_per_bndl_max = min(HTC_HOST_MAX_MSG_PER_BUNDLE, 2608 target->msg_per_bndl_max); 2609 2610 if (ath6kl_hif_enable_scatter(target->dev->ar)) { 2611 target->msg_per_bndl_max = 0; 2612 return; 2613 } 2614 2615 /* limit bundle what the device layer can handle */ 2616 target->msg_per_bndl_max = min(target->max_scat_entries, 2617 target->msg_per_bndl_max); 2618 2619 ath6kl_dbg(ATH6KL_DBG_BOOT, 2620 "htc bundling allowed msg_per_bndl_max %d\n", 2621 target->msg_per_bndl_max); 2622 2623 /* Max rx bundle size is limited by the max tx bundle size */ 2624 target->max_rx_bndl_sz = target->max_xfer_szper_scatreq; 2625 /* Max tx bundle size if limited by the extended mbox address range */ 2626 target->max_tx_bndl_sz = min(HIF_MBOX0_EXT_WIDTH, 2627 target->max_xfer_szper_scatreq); 2628 2629 ath6kl_dbg(ATH6KL_DBG_BOOT, "htc max_rx_bndl_sz %d max_tx_bndl_sz %d\n", 2630 target->max_rx_bndl_sz, target->max_tx_bndl_sz); 2631 2632 if (target->max_tx_bndl_sz) 2633 /* tx_bndl_mask is enabled per AC, each has 1 bit */ 2634 target->tx_bndl_mask = (1 << WMM_NUM_AC) - 1; 2635 2636 if (target->max_rx_bndl_sz) 2637 target->rx_bndl_enable = true; 2638 2639 if ((target->tgt_cred_sz % target->block_sz) != 0) { 2640 ath6kl_warn("credit size: %d is not block aligned! Disabling send bundling\n", 2641 target->tgt_cred_sz); 2642 2643 /* 2644 * Disallow send bundling since the credit size is 2645 * not aligned to a block size the I/O block 2646 * padding will spill into the next credit buffer 2647 * which is fatal. 2648 */ 2649 target->tx_bndl_mask = 0; 2650 } 2651 } 2652 2653 static int ath6kl_htc_mbox_wait_target(struct htc_target *target) 2654 { 2655 struct htc_packet *packet = NULL; 2656 struct htc_ready_ext_msg *rdy_msg; 2657 struct htc_service_connect_req connect; 2658 struct htc_service_connect_resp resp; 2659 int status; 2660 2661 /* we should be getting 1 control message that the target is ready */ 2662 packet = htc_wait_for_ctrl_msg(target); 2663 2664 if (!packet) 2665 return -ENOMEM; 2666 2667 /* we controlled the buffer creation so it's properly aligned */ 2668 rdy_msg = (struct htc_ready_ext_msg *)packet->buf; 2669 2670 if ((le16_to_cpu(rdy_msg->ver2_0_info.msg_id) != HTC_MSG_READY_ID) || 2671 (packet->act_len < sizeof(struct htc_ready_msg))) { 2672 status = -ENOMEM; 2673 goto fail_wait_target; 2674 } 2675 2676 if (!rdy_msg->ver2_0_info.cred_cnt || !rdy_msg->ver2_0_info.cred_sz) { 2677 status = -ENOMEM; 2678 goto fail_wait_target; 2679 } 2680 2681 target->tgt_creds = le16_to_cpu(rdy_msg->ver2_0_info.cred_cnt); 2682 target->tgt_cred_sz = le16_to_cpu(rdy_msg->ver2_0_info.cred_sz); 2683 2684 ath6kl_dbg(ATH6KL_DBG_BOOT, 2685 "htc target ready credits %d size %d\n", 2686 target->tgt_creds, target->tgt_cred_sz); 2687 2688 /* check if this is an extended ready message */ 2689 if (packet->act_len >= sizeof(struct htc_ready_ext_msg)) { 2690 /* this is an extended message */ 2691 target->htc_tgt_ver = rdy_msg->htc_ver; 2692 target->msg_per_bndl_max = rdy_msg->msg_per_htc_bndl; 2693 } else { 2694 /* legacy */ 2695 target->htc_tgt_ver = HTC_VERSION_2P0; 2696 target->msg_per_bndl_max = 0; 2697 } 2698 2699 ath6kl_dbg(ATH6KL_DBG_BOOT, "htc using protocol %s (%d)\n", 2700 (target->htc_tgt_ver == HTC_VERSION_2P0) ? "2.0" : ">= 2.1", 2701 target->htc_tgt_ver); 2702 2703 if (target->msg_per_bndl_max > 0) 2704 htc_setup_msg_bndl(target); 2705 2706 /* setup our pseudo HTC control endpoint connection */ 2707 memset(&connect, 0, sizeof(connect)); 2708 memset(&resp, 0, sizeof(resp)); 2709 connect.ep_cb.rx = htc_ctrl_rx; 2710 connect.ep_cb.rx_refill = NULL; 2711 connect.ep_cb.tx_full = NULL; 2712 connect.max_txq_depth = NUM_CONTROL_BUFFERS; 2713 connect.svc_id = HTC_CTRL_RSVD_SVC; 2714 2715 /* connect fake service */ 2716 status = ath6kl_htc_mbox_conn_service((void *)target, &connect, &resp); 2717 2718 if (status) 2719 /* 2720 * FIXME: this call doesn't make sense, the caller should 2721 * call ath6kl_htc_mbox_cleanup() when it wants remove htc 2722 */ 2723 ath6kl_hif_cleanup_scatter(target->dev->ar); 2724 2725 fail_wait_target: 2726 if (packet) { 2727 htc_rxpkt_reset(packet); 2728 reclaim_rx_ctrl_buf(target, packet); 2729 } 2730 2731 return status; 2732 } 2733 2734 /* 2735 * Start HTC, enable interrupts and let the target know 2736 * host has finished setup. 2737 */ 2738 static int ath6kl_htc_mbox_start(struct htc_target *target) 2739 { 2740 struct htc_packet *packet; 2741 int status; 2742 2743 memset(&target->dev->irq_proc_reg, 0, 2744 sizeof(target->dev->irq_proc_reg)); 2745 2746 /* Disable interrupts at the chip level */ 2747 ath6kl_hif_disable_intrs(target->dev); 2748 2749 target->htc_flags = 0; 2750 target->rx_st_flags = 0; 2751 2752 /* Push control receive buffers into htc control endpoint */ 2753 while ((packet = htc_get_control_buf(target, false)) != NULL) { 2754 status = htc_add_rxbuf(target, packet); 2755 if (status) 2756 return status; 2757 } 2758 2759 /* NOTE: the first entry in the distribution list is ENDPOINT_0 */ 2760 ath6kl_credit_init(target->credit_info, &target->cred_dist_list, 2761 target->tgt_creds); 2762 2763 dump_cred_dist_stats(target); 2764 2765 /* Indicate to the target of the setup completion */ 2766 status = htc_setup_tx_complete(target); 2767 2768 if (status) 2769 return status; 2770 2771 /* unmask interrupts */ 2772 status = ath6kl_hif_unmask_intrs(target->dev); 2773 2774 if (status) 2775 ath6kl_htc_mbox_stop(target); 2776 2777 return status; 2778 } 2779 2780 static int ath6kl_htc_reset(struct htc_target *target) 2781 { 2782 u32 block_size, ctrl_bufsz; 2783 struct htc_packet *packet; 2784 int i; 2785 2786 reset_ep_state(target); 2787 2788 block_size = target->dev->ar->mbox_info.block_size; 2789 2790 ctrl_bufsz = (block_size > HTC_MAX_CTRL_MSG_LEN) ? 2791 (block_size + HTC_HDR_LENGTH) : 2792 (HTC_MAX_CTRL_MSG_LEN + HTC_HDR_LENGTH); 2793 2794 for (i = 0; i < NUM_CONTROL_BUFFERS; i++) { 2795 packet = kzalloc(sizeof(*packet), GFP_KERNEL); 2796 if (!packet) 2797 return -ENOMEM; 2798 2799 packet->buf_start = kzalloc(ctrl_bufsz, GFP_KERNEL); 2800 if (!packet->buf_start) { 2801 kfree(packet); 2802 return -ENOMEM; 2803 } 2804 2805 packet->buf_len = ctrl_bufsz; 2806 if (i < NUM_CONTROL_RX_BUFFERS) { 2807 packet->act_len = 0; 2808 packet->buf = packet->buf_start; 2809 packet->endpoint = ENDPOINT_0; 2810 list_add_tail(&packet->list, &target->free_ctrl_rxbuf); 2811 } else { 2812 list_add_tail(&packet->list, &target->free_ctrl_txbuf); 2813 } 2814 } 2815 2816 return 0; 2817 } 2818 2819 /* htc_stop: stop interrupt reception, and flush all queued buffers */ 2820 static void ath6kl_htc_mbox_stop(struct htc_target *target) 2821 { 2822 spin_lock_bh(&target->htc_lock); 2823 target->htc_flags |= HTC_OP_STATE_STOPPING; 2824 spin_unlock_bh(&target->htc_lock); 2825 2826 /* 2827 * Masking interrupts is a synchronous operation, when this 2828 * function returns all pending HIF I/O has completed, we can 2829 * safely flush the queues. 2830 */ 2831 ath6kl_hif_mask_intrs(target->dev); 2832 2833 ath6kl_htc_flush_txep_all(target); 2834 2835 ath6kl_htc_mbox_flush_rx_buf(target); 2836 2837 ath6kl_htc_reset(target); 2838 } 2839 2840 static void *ath6kl_htc_mbox_create(struct ath6kl *ar) 2841 { 2842 struct htc_target *target = NULL; 2843 int status = 0; 2844 2845 target = kzalloc(sizeof(*target), GFP_KERNEL); 2846 if (!target) { 2847 ath6kl_err("unable to allocate memory\n"); 2848 return NULL; 2849 } 2850 2851 target->dev = kzalloc(sizeof(*target->dev), GFP_KERNEL); 2852 if (!target->dev) { 2853 ath6kl_err("unable to allocate memory\n"); 2854 kfree(target); 2855 return NULL; 2856 } 2857 2858 spin_lock_init(&target->htc_lock); 2859 spin_lock_init(&target->rx_lock); 2860 spin_lock_init(&target->tx_lock); 2861 2862 INIT_LIST_HEAD(&target->free_ctrl_txbuf); 2863 INIT_LIST_HEAD(&target->free_ctrl_rxbuf); 2864 INIT_LIST_HEAD(&target->cred_dist_list); 2865 2866 target->dev->ar = ar; 2867 target->dev->htc_cnxt = target; 2868 target->ep_waiting = ENDPOINT_MAX; 2869 2870 status = ath6kl_hif_setup(target->dev); 2871 if (status) 2872 goto err_htc_cleanup; 2873 2874 status = ath6kl_htc_reset(target); 2875 if (status) 2876 goto err_htc_cleanup; 2877 2878 return target; 2879 2880 err_htc_cleanup: 2881 ath6kl_htc_mbox_cleanup(target); 2882 2883 return NULL; 2884 } 2885 2886 /* cleanup the HTC instance */ 2887 static void ath6kl_htc_mbox_cleanup(struct htc_target *target) 2888 { 2889 struct htc_packet *packet, *tmp_packet; 2890 2891 ath6kl_hif_cleanup_scatter(target->dev->ar); 2892 2893 list_for_each_entry_safe(packet, tmp_packet, 2894 &target->free_ctrl_txbuf, list) { 2895 list_del(&packet->list); 2896 kfree(packet->buf_start); 2897 kfree(packet); 2898 } 2899 2900 list_for_each_entry_safe(packet, tmp_packet, 2901 &target->free_ctrl_rxbuf, list) { 2902 list_del(&packet->list); 2903 kfree(packet->buf_start); 2904 kfree(packet); 2905 } 2906 2907 kfree(target->dev); 2908 kfree(target); 2909 } 2910 2911 static const struct ath6kl_htc_ops ath6kl_htc_mbox_ops = { 2912 .create = ath6kl_htc_mbox_create, 2913 .wait_target = ath6kl_htc_mbox_wait_target, 2914 .start = ath6kl_htc_mbox_start, 2915 .conn_service = ath6kl_htc_mbox_conn_service, 2916 .tx = ath6kl_htc_mbox_tx, 2917 .stop = ath6kl_htc_mbox_stop, 2918 .cleanup = ath6kl_htc_mbox_cleanup, 2919 .flush_txep = ath6kl_htc_mbox_flush_txep, 2920 .flush_rx_buf = ath6kl_htc_mbox_flush_rx_buf, 2921 .activity_changed = ath6kl_htc_mbox_activity_changed, 2922 .get_rxbuf_num = ath6kl_htc_mbox_get_rxbuf_num, 2923 .add_rxbuf_multiple = ath6kl_htc_mbox_add_rxbuf_multiple, 2924 .credit_setup = ath6kl_htc_mbox_credit_setup, 2925 }; 2926 2927 void ath6kl_htc_mbox_attach(struct ath6kl *ar) 2928 { 2929 ar->htc_ops = &ath6kl_htc_mbox_ops; 2930 } 2931