1 /* 2 * Copyright (c) 2007-2011 Atheros Communications Inc. 3 * Copyright (c) 2011-2012 Qualcomm Atheros, Inc. 4 * 5 * Permission to use, copy, modify, and/or distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #include "core.h" 19 #include "hif.h" 20 #include "debug.h" 21 #include "hif-ops.h" 22 #include "trace.h" 23 24 #include <asm/unaligned.h> 25 26 #define CALC_TXRX_PADDED_LEN(dev, len) (__ALIGN_MASK((len), (dev)->block_mask)) 27 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 /* Endianess? */ 368 put_unaligned((u16)packet->act_len, &hdr->payld_len); 369 hdr->flags = flags; 370 hdr->eid = packet->endpoint; 371 hdr->ctrl[0] = ctrl0; 372 hdr->ctrl[1] = ctrl1; 373 } 374 375 static void htc_reclaim_txctrl_buf(struct htc_target *target, 376 struct htc_packet *pkt) 377 { 378 spin_lock_bh(&target->htc_lock); 379 list_add_tail(&pkt->list, &target->free_ctrl_txbuf); 380 spin_unlock_bh(&target->htc_lock); 381 } 382 383 static struct htc_packet *htc_get_control_buf(struct htc_target *target, 384 bool tx) 385 { 386 struct htc_packet *packet = NULL; 387 struct list_head *buf_list; 388 389 buf_list = tx ? &target->free_ctrl_txbuf : &target->free_ctrl_rxbuf; 390 391 spin_lock_bh(&target->htc_lock); 392 393 if (list_empty(buf_list)) { 394 spin_unlock_bh(&target->htc_lock); 395 return NULL; 396 } 397 398 packet = list_first_entry(buf_list, struct htc_packet, list); 399 list_del(&packet->list); 400 spin_unlock_bh(&target->htc_lock); 401 402 if (tx) 403 packet->buf = packet->buf_start + HTC_HDR_LENGTH; 404 405 return packet; 406 } 407 408 static void htc_tx_comp_update(struct htc_target *target, 409 struct htc_endpoint *endpoint, 410 struct htc_packet *packet) 411 { 412 packet->completion = NULL; 413 packet->buf += HTC_HDR_LENGTH; 414 415 if (!packet->status) 416 return; 417 418 ath6kl_err("req failed (status:%d, ep:%d, len:%d creds:%d)\n", 419 packet->status, packet->endpoint, packet->act_len, 420 packet->info.tx.cred_used); 421 422 /* on failure to submit, reclaim credits for this packet */ 423 spin_lock_bh(&target->tx_lock); 424 endpoint->cred_dist.cred_to_dist += 425 packet->info.tx.cred_used; 426 endpoint->cred_dist.txq_depth = get_queue_depth(&endpoint->txq); 427 428 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx ctxt 0x%p dist 0x%p\n", 429 target->credit_info, &target->cred_dist_list); 430 431 ath6kl_credit_distribute(target->credit_info, 432 &target->cred_dist_list, 433 HTC_CREDIT_DIST_SEND_COMPLETE); 434 435 spin_unlock_bh(&target->tx_lock); 436 } 437 438 static void htc_tx_complete(struct htc_endpoint *endpoint, 439 struct list_head *txq) 440 { 441 if (list_empty(txq)) 442 return; 443 444 ath6kl_dbg(ATH6KL_DBG_HTC, 445 "htc tx complete ep %d pkts %d\n", 446 endpoint->eid, get_queue_depth(txq)); 447 448 ath6kl_tx_complete(endpoint->target, txq); 449 } 450 451 static void htc_tx_comp_handler(struct htc_target *target, 452 struct htc_packet *packet) 453 { 454 struct htc_endpoint *endpoint = &target->endpoint[packet->endpoint]; 455 struct list_head container; 456 457 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx complete seqno %d\n", 458 packet->info.tx.seqno); 459 460 htc_tx_comp_update(target, endpoint, packet); 461 INIT_LIST_HEAD(&container); 462 list_add_tail(&packet->list, &container); 463 /* do completion */ 464 htc_tx_complete(endpoint, &container); 465 } 466 467 static void htc_async_tx_scat_complete(struct htc_target *target, 468 struct hif_scatter_req *scat_req) 469 { 470 struct htc_endpoint *endpoint; 471 struct htc_packet *packet; 472 struct list_head tx_compq; 473 int i; 474 475 INIT_LIST_HEAD(&tx_compq); 476 477 ath6kl_dbg(ATH6KL_DBG_HTC, 478 "htc tx scat complete len %d entries %d\n", 479 scat_req->len, scat_req->scat_entries); 480 481 if (scat_req->status) 482 ath6kl_err("send scatter req failed: %d\n", scat_req->status); 483 484 packet = scat_req->scat_list[0].packet; 485 endpoint = &target->endpoint[packet->endpoint]; 486 487 /* walk through the scatter list and process */ 488 for (i = 0; i < scat_req->scat_entries; i++) { 489 packet = scat_req->scat_list[i].packet; 490 if (!packet) { 491 WARN_ON(1); 492 return; 493 } 494 495 packet->status = scat_req->status; 496 htc_tx_comp_update(target, endpoint, packet); 497 list_add_tail(&packet->list, &tx_compq); 498 } 499 500 /* free scatter request */ 501 hif_scatter_req_add(target->dev->ar, scat_req); 502 503 /* complete all packets */ 504 htc_tx_complete(endpoint, &tx_compq); 505 } 506 507 static int ath6kl_htc_tx_issue(struct htc_target *target, 508 struct htc_packet *packet) 509 { 510 int status; 511 bool sync = false; 512 u32 padded_len, send_len; 513 514 if (!packet->completion) 515 sync = true; 516 517 send_len = packet->act_len + HTC_HDR_LENGTH; 518 519 padded_len = CALC_TXRX_PADDED_LEN(target, send_len); 520 521 ath6kl_dbg(ATH6KL_DBG_HTC, 522 "htc tx issue len %d seqno %d padded_len %d mbox 0x%X %s\n", 523 send_len, packet->info.tx.seqno, padded_len, 524 target->dev->ar->mbox_info.htc_addr, 525 sync ? "sync" : "async"); 526 527 if (sync) { 528 status = hif_read_write_sync(target->dev->ar, 529 target->dev->ar->mbox_info.htc_addr, 530 packet->buf, padded_len, 531 HIF_WR_SYNC_BLOCK_INC); 532 533 packet->status = status; 534 packet->buf += HTC_HDR_LENGTH; 535 } else 536 status = hif_write_async(target->dev->ar, 537 target->dev->ar->mbox_info.htc_addr, 538 packet->buf, padded_len, 539 HIF_WR_ASYNC_BLOCK_INC, packet); 540 541 trace_ath6kl_htc_tx(status, packet->endpoint, packet->buf, send_len); 542 543 return status; 544 } 545 546 static int htc_check_credits(struct htc_target *target, 547 struct htc_endpoint *ep, u8 *flags, 548 enum htc_endpoint_id eid, unsigned int len, 549 int *req_cred) 550 { 551 *req_cred = (len > target->tgt_cred_sz) ? 552 DIV_ROUND_UP(len, target->tgt_cred_sz) : 1; 553 554 ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit check need %d got %d\n", 555 *req_cred, ep->cred_dist.credits); 556 557 if (ep->cred_dist.credits < *req_cred) { 558 if (eid == ENDPOINT_0) 559 return -EINVAL; 560 561 /* Seek more credits */ 562 ep->cred_dist.seek_cred = *req_cred - ep->cred_dist.credits; 563 564 ath6kl_credit_seek(target->credit_info, &ep->cred_dist); 565 566 ep->cred_dist.seek_cred = 0; 567 568 if (ep->cred_dist.credits < *req_cred) { 569 ath6kl_dbg(ATH6KL_DBG_CREDIT, 570 "credit not found for ep %d\n", 571 eid); 572 return -EINVAL; 573 } 574 } 575 576 ep->cred_dist.credits -= *req_cred; 577 ep->ep_st.cred_cosumd += *req_cred; 578 579 /* When we are getting low on credits, ask for more */ 580 if (ep->cred_dist.credits < ep->cred_dist.cred_per_msg) { 581 ep->cred_dist.seek_cred = 582 ep->cred_dist.cred_per_msg - ep->cred_dist.credits; 583 584 ath6kl_credit_seek(target->credit_info, &ep->cred_dist); 585 586 /* see if we were successful in getting more */ 587 if (ep->cred_dist.credits < ep->cred_dist.cred_per_msg) { 588 /* tell the target we need credits ASAP! */ 589 *flags |= HTC_FLAGS_NEED_CREDIT_UPDATE; 590 ep->ep_st.cred_low_indicate += 1; 591 ath6kl_dbg(ATH6KL_DBG_CREDIT, 592 "credit we need credits asap\n"); 593 } 594 } 595 596 return 0; 597 } 598 599 static void ath6kl_htc_tx_pkts_get(struct htc_target *target, 600 struct htc_endpoint *endpoint, 601 struct list_head *queue) 602 { 603 int req_cred; 604 u8 flags; 605 struct htc_packet *packet; 606 unsigned int len; 607 608 while (true) { 609 flags = 0; 610 611 if (list_empty(&endpoint->txq)) 612 break; 613 packet = list_first_entry(&endpoint->txq, struct htc_packet, 614 list); 615 616 ath6kl_dbg(ATH6KL_DBG_HTC, 617 "htc tx got packet 0x%p queue depth %d\n", 618 packet, get_queue_depth(&endpoint->txq)); 619 620 len = CALC_TXRX_PADDED_LEN(target, 621 packet->act_len + HTC_HDR_LENGTH); 622 623 if (htc_check_credits(target, endpoint, &flags, 624 packet->endpoint, len, &req_cred)) 625 break; 626 627 /* now we can fully move onto caller's queue */ 628 packet = list_first_entry(&endpoint->txq, struct htc_packet, 629 list); 630 list_move_tail(&packet->list, queue); 631 632 /* save the number of credits this packet consumed */ 633 packet->info.tx.cred_used = req_cred; 634 635 /* all TX packets are handled asynchronously */ 636 packet->completion = htc_tx_comp_handler; 637 packet->context = target; 638 endpoint->ep_st.tx_issued += 1; 639 640 /* save send flags */ 641 packet->info.tx.flags = flags; 642 packet->info.tx.seqno = endpoint->seqno; 643 endpoint->seqno++; 644 } 645 } 646 647 /* See if the padded tx length falls on a credit boundary */ 648 static int htc_get_credit_padding(unsigned int cred_sz, int *len, 649 struct htc_endpoint *ep) 650 { 651 int rem_cred, cred_pad; 652 653 rem_cred = *len % cred_sz; 654 655 /* No padding needed */ 656 if (!rem_cred) 657 return 0; 658 659 if (!(ep->conn_flags & HTC_FLGS_TX_BNDL_PAD_EN)) 660 return -1; 661 662 /* 663 * The transfer consumes a "partial" credit, this 664 * packet cannot be bundled unless we add 665 * additional "dummy" padding (max 255 bytes) to 666 * consume the entire credit. 667 */ 668 cred_pad = *len < cred_sz ? (cred_sz - *len) : rem_cred; 669 670 if ((cred_pad > 0) && (cred_pad <= 255)) 671 *len += cred_pad; 672 else 673 /* The amount of padding is too large, send as non-bundled */ 674 return -1; 675 676 return cred_pad; 677 } 678 679 static int ath6kl_htc_tx_setup_scat_list(struct htc_target *target, 680 struct htc_endpoint *endpoint, 681 struct hif_scatter_req *scat_req, 682 int n_scat, 683 struct list_head *queue) 684 { 685 struct htc_packet *packet; 686 int i, len, rem_scat, cred_pad; 687 int status = 0; 688 u8 flags; 689 690 rem_scat = target->max_tx_bndl_sz; 691 692 for (i = 0; i < n_scat; i++) { 693 scat_req->scat_list[i].packet = NULL; 694 695 if (list_empty(queue)) 696 break; 697 698 packet = list_first_entry(queue, struct htc_packet, list); 699 len = CALC_TXRX_PADDED_LEN(target, 700 packet->act_len + HTC_HDR_LENGTH); 701 702 cred_pad = htc_get_credit_padding(target->tgt_cred_sz, 703 &len, endpoint); 704 if (cred_pad < 0 || rem_scat < len) { 705 status = -ENOSPC; 706 break; 707 } 708 709 rem_scat -= len; 710 /* now remove it from the queue */ 711 list_del(&packet->list); 712 713 scat_req->scat_list[i].packet = packet; 714 /* prepare packet and flag message as part of a send bundle */ 715 flags = packet->info.tx.flags | HTC_FLAGS_SEND_BUNDLE; 716 ath6kl_htc_tx_prep_pkt(packet, flags, 717 cred_pad, packet->info.tx.seqno); 718 /* Make sure the buffer is 4-byte aligned */ 719 ath6kl_htc_tx_buf_align(&packet->buf, 720 packet->act_len + HTC_HDR_LENGTH); 721 scat_req->scat_list[i].buf = packet->buf; 722 scat_req->scat_list[i].len = len; 723 724 scat_req->len += len; 725 scat_req->scat_entries++; 726 ath6kl_dbg(ATH6KL_DBG_HTC, 727 "htc tx adding (%d) pkt 0x%p seqno %d len %d remaining %d\n", 728 i, packet, packet->info.tx.seqno, len, rem_scat); 729 } 730 731 /* Roll back scatter setup in case of any failure */ 732 if (scat_req->scat_entries < HTC_MIN_HTC_MSGS_TO_BUNDLE) { 733 for (i = scat_req->scat_entries - 1; i >= 0; i--) { 734 packet = scat_req->scat_list[i].packet; 735 if (packet) { 736 packet->buf += HTC_HDR_LENGTH; 737 list_add(&packet->list, queue); 738 } 739 } 740 return -EAGAIN; 741 } 742 743 return status; 744 } 745 746 /* 747 * Drain a queue and send as bundles this function may return without fully 748 * draining the queue when 749 * 750 * 1. scatter resources are exhausted 751 * 2. a message that will consume a partial credit will stop the 752 * bundling process early 753 * 3. we drop below the minimum number of messages for a bundle 754 */ 755 static void ath6kl_htc_tx_bundle(struct htc_endpoint *endpoint, 756 struct list_head *queue, 757 int *sent_bundle, int *n_bundle_pkts) 758 { 759 struct htc_target *target = endpoint->target; 760 struct hif_scatter_req *scat_req = NULL; 761 int n_scat, n_sent_bundle = 0, tot_pkts_bundle = 0, i; 762 struct htc_packet *packet; 763 int status; 764 u32 txb_mask; 765 u8 ac = WMM_NUM_AC; 766 767 if ((HTC_CTRL_RSVD_SVC != endpoint->svc_id) && 768 (WMI_CONTROL_SVC != endpoint->svc_id)) 769 ac = target->dev->ar->ep2ac_map[endpoint->eid]; 770 771 while (true) { 772 status = 0; 773 n_scat = get_queue_depth(queue); 774 n_scat = min(n_scat, target->msg_per_bndl_max); 775 776 if (n_scat < HTC_MIN_HTC_MSGS_TO_BUNDLE) 777 /* not enough to bundle */ 778 break; 779 780 scat_req = hif_scatter_req_get(target->dev->ar); 781 782 if (!scat_req) { 783 /* no scatter resources */ 784 ath6kl_dbg(ATH6KL_DBG_HTC, 785 "htc tx no more scatter resources\n"); 786 break; 787 } 788 789 if ((ac < WMM_NUM_AC) && (ac != WMM_AC_BK)) { 790 if (WMM_AC_BE == ac) 791 /* 792 * BE, BK have priorities and bit 793 * positions reversed 794 */ 795 txb_mask = (1 << WMM_AC_BK); 796 else 797 /* 798 * any AC with priority lower than 799 * itself 800 */ 801 txb_mask = ((1 << ac) - 1); 802 803 /* 804 * when the scatter request resources drop below a 805 * certain threshold, disable Tx bundling for all 806 * AC's with priority lower than the current requesting 807 * AC. Otherwise re-enable Tx bundling for them 808 */ 809 if (scat_req->scat_q_depth < ATH6KL_SCATTER_REQS) 810 target->tx_bndl_mask &= ~txb_mask; 811 else 812 target->tx_bndl_mask |= txb_mask; 813 } 814 815 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx pkts to scatter: %d\n", 816 n_scat); 817 818 scat_req->len = 0; 819 scat_req->scat_entries = 0; 820 821 status = ath6kl_htc_tx_setup_scat_list(target, endpoint, 822 scat_req, n_scat, 823 queue); 824 if (status == -EAGAIN) { 825 hif_scatter_req_add(target->dev->ar, scat_req); 826 break; 827 } 828 829 /* send path is always asynchronous */ 830 scat_req->complete = htc_async_tx_scat_complete; 831 n_sent_bundle++; 832 tot_pkts_bundle += scat_req->scat_entries; 833 834 ath6kl_dbg(ATH6KL_DBG_HTC, 835 "htc tx scatter bytes %d entries %d\n", 836 scat_req->len, scat_req->scat_entries); 837 838 for (i = 0; i < scat_req->scat_entries; i++) { 839 packet = scat_req->scat_list[i].packet; 840 trace_ath6kl_htc_tx(packet->status, packet->endpoint, 841 packet->buf, packet->act_len); 842 } 843 844 ath6kl_hif_submit_scat_req(target->dev, scat_req, false); 845 846 if (status) 847 break; 848 } 849 850 *sent_bundle = n_sent_bundle; 851 *n_bundle_pkts = tot_pkts_bundle; 852 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx bundle sent %d pkts\n", 853 n_sent_bundle); 854 855 return; 856 } 857 858 static void ath6kl_htc_tx_from_queue(struct htc_target *target, 859 struct htc_endpoint *endpoint) 860 { 861 struct list_head txq; 862 struct htc_packet *packet; 863 int bundle_sent; 864 int n_pkts_bundle; 865 u8 ac = WMM_NUM_AC; 866 int status; 867 868 spin_lock_bh(&target->tx_lock); 869 870 endpoint->tx_proc_cnt++; 871 if (endpoint->tx_proc_cnt > 1) { 872 endpoint->tx_proc_cnt--; 873 spin_unlock_bh(&target->tx_lock); 874 ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx busy\n"); 875 return; 876 } 877 878 /* 879 * drain the endpoint TX queue for transmission as long 880 * as we have enough credits. 881 */ 882 INIT_LIST_HEAD(&txq); 883 884 if ((HTC_CTRL_RSVD_SVC != endpoint->svc_id) && 885 (WMI_CONTROL_SVC != endpoint->svc_id)) 886 ac = target->dev->ar->ep2ac_map[endpoint->eid]; 887 888 while (true) { 889 if (list_empty(&endpoint->txq)) 890 break; 891 892 ath6kl_htc_tx_pkts_get(target, endpoint, &txq); 893 894 if (list_empty(&txq)) 895 break; 896 897 spin_unlock_bh(&target->tx_lock); 898 899 bundle_sent = 0; 900 n_pkts_bundle = 0; 901 902 while (true) { 903 /* try to send a bundle on each pass */ 904 if ((target->tx_bndl_mask) && 905 (get_queue_depth(&txq) >= 906 HTC_MIN_HTC_MSGS_TO_BUNDLE)) { 907 int temp1 = 0, temp2 = 0; 908 909 /* check if bundling is enabled for an AC */ 910 if (target->tx_bndl_mask & (1 << ac)) { 911 ath6kl_htc_tx_bundle(endpoint, &txq, 912 &temp1, &temp2); 913 bundle_sent += temp1; 914 n_pkts_bundle += temp2; 915 } 916 } 917 918 if (list_empty(&txq)) 919 break; 920 921 packet = list_first_entry(&txq, struct htc_packet, 922 list); 923 list_del(&packet->list); 924 925 ath6kl_htc_tx_prep_pkt(packet, packet->info.tx.flags, 926 0, packet->info.tx.seqno); 927 status = ath6kl_htc_tx_issue(target, packet); 928 929 if (status) { 930 packet->status = status; 931 packet->completion(packet->context, packet); 932 } 933 } 934 935 spin_lock_bh(&target->tx_lock); 936 937 endpoint->ep_st.tx_bundles += bundle_sent; 938 endpoint->ep_st.tx_pkt_bundled += n_pkts_bundle; 939 940 /* 941 * if an AC has bundling disabled and no tx bundling 942 * has occured continously for a certain number of TX, 943 * enable tx bundling for this AC 944 */ 945 if (!bundle_sent) { 946 if (!(target->tx_bndl_mask & (1 << ac)) && 947 (ac < WMM_NUM_AC)) { 948 if (++target->ac_tx_count[ac] >= 949 TX_RESUME_BUNDLE_THRESHOLD) { 950 target->ac_tx_count[ac] = 0; 951 target->tx_bndl_mask |= (1 << ac); 952 } 953 } 954 } else { 955 /* tx bundling will reset the counter */ 956 if (ac < WMM_NUM_AC) 957 target->ac_tx_count[ac] = 0; 958 } 959 } 960 961 endpoint->tx_proc_cnt = 0; 962 spin_unlock_bh(&target->tx_lock); 963 } 964 965 static bool ath6kl_htc_tx_try(struct htc_target *target, 966 struct htc_endpoint *endpoint, 967 struct htc_packet *tx_pkt) 968 { 969 struct htc_ep_callbacks ep_cb; 970 int txq_depth; 971 bool overflow = false; 972 973 ep_cb = endpoint->ep_cb; 974 975 spin_lock_bh(&target->tx_lock); 976 txq_depth = get_queue_depth(&endpoint->txq); 977 spin_unlock_bh(&target->tx_lock); 978 979 if (txq_depth >= endpoint->max_txq_depth) 980 overflow = true; 981 982 if (overflow) 983 ath6kl_dbg(ATH6KL_DBG_HTC, 984 "htc tx overflow ep %d depth %d max %d\n", 985 endpoint->eid, txq_depth, 986 endpoint->max_txq_depth); 987 988 if (overflow && ep_cb.tx_full) { 989 if (ep_cb.tx_full(endpoint->target, tx_pkt) == 990 HTC_SEND_FULL_DROP) { 991 endpoint->ep_st.tx_dropped += 1; 992 return false; 993 } 994 } 995 996 spin_lock_bh(&target->tx_lock); 997 list_add_tail(&tx_pkt->list, &endpoint->txq); 998 spin_unlock_bh(&target->tx_lock); 999 1000 ath6kl_htc_tx_from_queue(target, endpoint); 1001 1002 return true; 1003 } 1004 1005 static void htc_chk_ep_txq(struct htc_target *target) 1006 { 1007 struct htc_endpoint *endpoint; 1008 struct htc_endpoint_credit_dist *cred_dist; 1009 1010 /* 1011 * Run through the credit distribution list to see if there are 1012 * packets queued. NOTE: no locks need to be taken since the 1013 * distribution list is not dynamic (cannot be re-ordered) and we 1014 * are not modifying any state. 1015 */ 1016 list_for_each_entry(cred_dist, &target->cred_dist_list, list) { 1017 endpoint = cred_dist->htc_ep; 1018 1019 spin_lock_bh(&target->tx_lock); 1020 if (!list_empty(&endpoint->txq)) { 1021 ath6kl_dbg(ATH6KL_DBG_HTC, 1022 "htc creds ep %d credits %d pkts %d\n", 1023 cred_dist->endpoint, 1024 endpoint->cred_dist.credits, 1025 get_queue_depth(&endpoint->txq)); 1026 spin_unlock_bh(&target->tx_lock); 1027 /* 1028 * Try to start the stalled queue, this list is 1029 * ordered by priority. If there are credits 1030 * available the highest priority queue will get a 1031 * chance to reclaim credits from lower priority 1032 * ones. 1033 */ 1034 ath6kl_htc_tx_from_queue(target, endpoint); 1035 spin_lock_bh(&target->tx_lock); 1036 } 1037 spin_unlock_bh(&target->tx_lock); 1038 } 1039 } 1040 1041 static int htc_setup_tx_complete(struct htc_target *target) 1042 { 1043 struct htc_packet *send_pkt = NULL; 1044 int status; 1045 1046 send_pkt = htc_get_control_buf(target, true); 1047 1048 if (!send_pkt) 1049 return -ENOMEM; 1050 1051 if (target->htc_tgt_ver >= HTC_VERSION_2P1) { 1052 struct htc_setup_comp_ext_msg *setup_comp_ext; 1053 u32 flags = 0; 1054 1055 setup_comp_ext = 1056 (struct htc_setup_comp_ext_msg *)send_pkt->buf; 1057 memset(setup_comp_ext, 0, sizeof(*setup_comp_ext)); 1058 setup_comp_ext->msg_id = 1059 cpu_to_le16(HTC_MSG_SETUP_COMPLETE_EX_ID); 1060 1061 if (target->msg_per_bndl_max > 0) { 1062 /* Indicate HTC bundling to the target */ 1063 flags |= HTC_SETUP_COMP_FLG_RX_BNDL_EN; 1064 setup_comp_ext->msg_per_rxbndl = 1065 target->msg_per_bndl_max; 1066 } 1067 1068 memcpy(&setup_comp_ext->flags, &flags, 1069 sizeof(setup_comp_ext->flags)); 1070 set_htc_pkt_info(send_pkt, NULL, (u8 *) setup_comp_ext, 1071 sizeof(struct htc_setup_comp_ext_msg), 1072 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG); 1073 1074 } else { 1075 struct htc_setup_comp_msg *setup_comp; 1076 setup_comp = (struct htc_setup_comp_msg *)send_pkt->buf; 1077 memset(setup_comp, 0, sizeof(struct htc_setup_comp_msg)); 1078 setup_comp->msg_id = cpu_to_le16(HTC_MSG_SETUP_COMPLETE_ID); 1079 set_htc_pkt_info(send_pkt, NULL, (u8 *) setup_comp, 1080 sizeof(struct htc_setup_comp_msg), 1081 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG); 1082 } 1083 1084 /* we want synchronous operation */ 1085 send_pkt->completion = NULL; 1086 ath6kl_htc_tx_prep_pkt(send_pkt, 0, 0, 0); 1087 status = ath6kl_htc_tx_issue(target, send_pkt); 1088 1089 if (send_pkt != NULL) 1090 htc_reclaim_txctrl_buf(target, send_pkt); 1091 1092 return status; 1093 } 1094 1095 static void ath6kl_htc_set_credit_dist(struct htc_target *target, 1096 struct ath6kl_htc_credit_info *credit_info, 1097 u16 srvc_pri_order[], int list_len) 1098 { 1099 struct htc_endpoint *endpoint; 1100 int i, ep; 1101 1102 target->credit_info = credit_info; 1103 1104 list_add_tail(&target->endpoint[ENDPOINT_0].cred_dist.list, 1105 &target->cred_dist_list); 1106 1107 for (i = 0; i < list_len; i++) { 1108 for (ep = ENDPOINT_1; ep < ENDPOINT_MAX; ep++) { 1109 endpoint = &target->endpoint[ep]; 1110 if (endpoint->svc_id == srvc_pri_order[i]) { 1111 list_add_tail(&endpoint->cred_dist.list, 1112 &target->cred_dist_list); 1113 break; 1114 } 1115 } 1116 if (ep >= ENDPOINT_MAX) { 1117 WARN_ON(1); 1118 return; 1119 } 1120 } 1121 } 1122 1123 static int ath6kl_htc_mbox_tx(struct htc_target *target, 1124 struct htc_packet *packet) 1125 { 1126 struct htc_endpoint *endpoint; 1127 struct list_head queue; 1128 1129 ath6kl_dbg(ATH6KL_DBG_HTC, 1130 "htc tx ep id %d buf 0x%p len %d\n", 1131 packet->endpoint, packet->buf, packet->act_len); 1132 1133 if (packet->endpoint >= ENDPOINT_MAX) { 1134 WARN_ON(1); 1135 return -EINVAL; 1136 } 1137 1138 endpoint = &target->endpoint[packet->endpoint]; 1139 1140 if (!ath6kl_htc_tx_try(target, endpoint, packet)) { 1141 packet->status = (target->htc_flags & HTC_OP_STATE_STOPPING) ? 1142 -ECANCELED : -ENOSPC; 1143 INIT_LIST_HEAD(&queue); 1144 list_add(&packet->list, &queue); 1145 htc_tx_complete(endpoint, &queue); 1146 } 1147 1148 return 0; 1149 } 1150 1151 /* flush endpoint TX queue */ 1152 static void ath6kl_htc_mbox_flush_txep(struct htc_target *target, 1153 enum htc_endpoint_id eid, u16 tag) 1154 { 1155 struct htc_packet *packet, *tmp_pkt; 1156 struct list_head discard_q, container; 1157 struct htc_endpoint *endpoint = &target->endpoint[eid]; 1158 1159 if (!endpoint->svc_id) { 1160 WARN_ON(1); 1161 return; 1162 } 1163 1164 /* initialize the discard queue */ 1165 INIT_LIST_HEAD(&discard_q); 1166 1167 spin_lock_bh(&target->tx_lock); 1168 1169 list_for_each_entry_safe(packet, tmp_pkt, &endpoint->txq, list) { 1170 if ((tag == HTC_TX_PACKET_TAG_ALL) || 1171 (tag == packet->info.tx.tag)) 1172 list_move_tail(&packet->list, &discard_q); 1173 } 1174 1175 spin_unlock_bh(&target->tx_lock); 1176 1177 list_for_each_entry_safe(packet, tmp_pkt, &discard_q, list) { 1178 packet->status = -ECANCELED; 1179 list_del(&packet->list); 1180 ath6kl_dbg(ATH6KL_DBG_HTC, 1181 "htc tx flushing pkt 0x%p len %d ep %d tag 0x%x\n", 1182 packet, packet->act_len, 1183 packet->endpoint, packet->info.tx.tag); 1184 1185 INIT_LIST_HEAD(&container); 1186 list_add_tail(&packet->list, &container); 1187 htc_tx_complete(endpoint, &container); 1188 } 1189 } 1190 1191 static void ath6kl_htc_flush_txep_all(struct htc_target *target) 1192 { 1193 struct htc_endpoint *endpoint; 1194 int i; 1195 1196 dump_cred_dist_stats(target); 1197 1198 for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) { 1199 endpoint = &target->endpoint[i]; 1200 if (endpoint->svc_id == 0) 1201 /* not in use.. */ 1202 continue; 1203 ath6kl_htc_mbox_flush_txep(target, i, HTC_TX_PACKET_TAG_ALL); 1204 } 1205 } 1206 1207 static void ath6kl_htc_mbox_activity_changed(struct htc_target *target, 1208 enum htc_endpoint_id eid, 1209 bool active) 1210 { 1211 struct htc_endpoint *endpoint = &target->endpoint[eid]; 1212 bool dist = false; 1213 1214 if (endpoint->svc_id == 0) { 1215 WARN_ON(1); 1216 return; 1217 } 1218 1219 spin_lock_bh(&target->tx_lock); 1220 1221 if (active) { 1222 if (!(endpoint->cred_dist.dist_flags & HTC_EP_ACTIVE)) { 1223 endpoint->cred_dist.dist_flags |= HTC_EP_ACTIVE; 1224 dist = true; 1225 } 1226 } else { 1227 if (endpoint->cred_dist.dist_flags & HTC_EP_ACTIVE) { 1228 endpoint->cred_dist.dist_flags &= ~HTC_EP_ACTIVE; 1229 dist = true; 1230 } 1231 } 1232 1233 if (dist) { 1234 endpoint->cred_dist.txq_depth = 1235 get_queue_depth(&endpoint->txq); 1236 1237 ath6kl_dbg(ATH6KL_DBG_HTC, 1238 "htc tx activity ctxt 0x%p dist 0x%p\n", 1239 target->credit_info, &target->cred_dist_list); 1240 1241 ath6kl_credit_distribute(target->credit_info, 1242 &target->cred_dist_list, 1243 HTC_CREDIT_DIST_ACTIVITY_CHANGE); 1244 } 1245 1246 spin_unlock_bh(&target->tx_lock); 1247 1248 if (dist && !active) 1249 htc_chk_ep_txq(target); 1250 } 1251 1252 /* HTC Rx */ 1253 1254 static inline void ath6kl_htc_rx_update_stats(struct htc_endpoint *endpoint, 1255 int n_look_ahds) 1256 { 1257 endpoint->ep_st.rx_pkts++; 1258 if (n_look_ahds == 1) 1259 endpoint->ep_st.rx_lkahds++; 1260 else if (n_look_ahds > 1) 1261 endpoint->ep_st.rx_bundle_lkahd++; 1262 } 1263 1264 static inline bool htc_valid_rx_frame_len(struct htc_target *target, 1265 enum htc_endpoint_id eid, int len) 1266 { 1267 return (eid == target->dev->ar->ctrl_ep) ? 1268 len <= ATH6KL_BUFFER_SIZE : len <= ATH6KL_AMSDU_BUFFER_SIZE; 1269 } 1270 1271 static int htc_add_rxbuf(struct htc_target *target, struct htc_packet *packet) 1272 { 1273 struct list_head queue; 1274 1275 INIT_LIST_HEAD(&queue); 1276 list_add_tail(&packet->list, &queue); 1277 return ath6kl_htc_mbox_add_rxbuf_multiple(target, &queue); 1278 } 1279 1280 static void htc_reclaim_rxbuf(struct htc_target *target, 1281 struct htc_packet *packet, 1282 struct htc_endpoint *ep) 1283 { 1284 if (packet->info.rx.rx_flags & HTC_RX_PKT_NO_RECYCLE) { 1285 htc_rxpkt_reset(packet); 1286 packet->status = -ECANCELED; 1287 ep->ep_cb.rx(ep->target, packet); 1288 } else { 1289 htc_rxpkt_reset(packet); 1290 htc_add_rxbuf((void *)(target), packet); 1291 } 1292 } 1293 1294 static void reclaim_rx_ctrl_buf(struct htc_target *target, 1295 struct htc_packet *packet) 1296 { 1297 spin_lock_bh(&target->htc_lock); 1298 list_add_tail(&packet->list, &target->free_ctrl_rxbuf); 1299 spin_unlock_bh(&target->htc_lock); 1300 } 1301 1302 static int ath6kl_htc_rx_packet(struct htc_target *target, 1303 struct htc_packet *packet, 1304 u32 rx_len) 1305 { 1306 struct ath6kl_device *dev = target->dev; 1307 u32 padded_len; 1308 int status; 1309 1310 padded_len = CALC_TXRX_PADDED_LEN(target, rx_len); 1311 1312 if (padded_len > packet->buf_len) { 1313 ath6kl_err("not enough receive space for packet - padlen %d recvlen %d bufferlen %d\n", 1314 padded_len, rx_len, packet->buf_len); 1315 return -ENOMEM; 1316 } 1317 1318 ath6kl_dbg(ATH6KL_DBG_HTC, 1319 "htc rx 0x%p hdr 0x%x len %d mbox 0x%x\n", 1320 packet, packet->info.rx.exp_hdr, 1321 padded_len, dev->ar->mbox_info.htc_addr); 1322 1323 status = hif_read_write_sync(dev->ar, 1324 dev->ar->mbox_info.htc_addr, 1325 packet->buf, padded_len, 1326 HIF_RD_SYNC_BLOCK_FIX); 1327 1328 packet->status = status; 1329 1330 return status; 1331 } 1332 1333 /* 1334 * optimization for recv packets, we can indicate a 1335 * "hint" that there are more single-packets to fetch 1336 * on this endpoint. 1337 */ 1338 static void ath6kl_htc_rx_set_indicate(u32 lk_ahd, 1339 struct htc_endpoint *endpoint, 1340 struct htc_packet *packet) 1341 { 1342 struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)&lk_ahd; 1343 1344 if (htc_hdr->eid == packet->endpoint) { 1345 if (!list_empty(&endpoint->rx_bufq)) 1346 packet->info.rx.indicat_flags |= 1347 HTC_RX_FLAGS_INDICATE_MORE_PKTS; 1348 } 1349 } 1350 1351 static void ath6kl_htc_rx_chk_water_mark(struct htc_endpoint *endpoint) 1352 { 1353 struct htc_ep_callbacks ep_cb = endpoint->ep_cb; 1354 1355 if (ep_cb.rx_refill_thresh > 0) { 1356 spin_lock_bh(&endpoint->target->rx_lock); 1357 if (get_queue_depth(&endpoint->rx_bufq) 1358 < ep_cb.rx_refill_thresh) { 1359 spin_unlock_bh(&endpoint->target->rx_lock); 1360 ep_cb.rx_refill(endpoint->target, endpoint->eid); 1361 return; 1362 } 1363 spin_unlock_bh(&endpoint->target->rx_lock); 1364 } 1365 } 1366 1367 /* This function is called with rx_lock held */ 1368 static int ath6kl_htc_rx_setup(struct htc_target *target, 1369 struct htc_endpoint *ep, 1370 u32 *lk_ahds, struct list_head *queue, int n_msg) 1371 { 1372 struct htc_packet *packet; 1373 /* FIXME: type of lk_ahds can't be right */ 1374 struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)lk_ahds; 1375 struct htc_ep_callbacks ep_cb; 1376 int status = 0, j, full_len; 1377 bool no_recycle; 1378 1379 full_len = CALC_TXRX_PADDED_LEN(target, 1380 le16_to_cpu(htc_hdr->payld_len) + 1381 sizeof(*htc_hdr)); 1382 1383 if (!htc_valid_rx_frame_len(target, ep->eid, full_len)) { 1384 ath6kl_warn("Rx buffer requested with invalid length htc_hdr:eid %d, flags 0x%x, len %d\n", 1385 htc_hdr->eid, htc_hdr->flags, 1386 le16_to_cpu(htc_hdr->payld_len)); 1387 return -EINVAL; 1388 } 1389 1390 ep_cb = ep->ep_cb; 1391 for (j = 0; j < n_msg; j++) { 1392 /* 1393 * Reset flag, any packets allocated using the 1394 * rx_alloc() API cannot be recycled on 1395 * cleanup,they must be explicitly returned. 1396 */ 1397 no_recycle = false; 1398 1399 if (ep_cb.rx_allocthresh && 1400 (full_len > ep_cb.rx_alloc_thresh)) { 1401 ep->ep_st.rx_alloc_thresh_hit += 1; 1402 ep->ep_st.rxalloc_thresh_byte += 1403 le16_to_cpu(htc_hdr->payld_len); 1404 1405 spin_unlock_bh(&target->rx_lock); 1406 no_recycle = true; 1407 1408 packet = ep_cb.rx_allocthresh(ep->target, ep->eid, 1409 full_len); 1410 spin_lock_bh(&target->rx_lock); 1411 } else { 1412 /* refill handler is being used */ 1413 if (list_empty(&ep->rx_bufq)) { 1414 if (ep_cb.rx_refill) { 1415 spin_unlock_bh(&target->rx_lock); 1416 ep_cb.rx_refill(ep->target, ep->eid); 1417 spin_lock_bh(&target->rx_lock); 1418 } 1419 } 1420 1421 if (list_empty(&ep->rx_bufq)) { 1422 packet = NULL; 1423 } else { 1424 packet = list_first_entry(&ep->rx_bufq, 1425 struct htc_packet, list); 1426 list_del(&packet->list); 1427 } 1428 } 1429 1430 if (!packet) { 1431 target->rx_st_flags |= HTC_RECV_WAIT_BUFFERS; 1432 target->ep_waiting = ep->eid; 1433 return -ENOSPC; 1434 } 1435 1436 /* clear flags */ 1437 packet->info.rx.rx_flags = 0; 1438 packet->info.rx.indicat_flags = 0; 1439 packet->status = 0; 1440 1441 if (no_recycle) 1442 /* 1443 * flag that these packets cannot be 1444 * recycled, they have to be returned to 1445 * the user 1446 */ 1447 packet->info.rx.rx_flags |= HTC_RX_PKT_NO_RECYCLE; 1448 1449 /* Caller needs to free this upon any failure */ 1450 list_add_tail(&packet->list, queue); 1451 1452 if (target->htc_flags & HTC_OP_STATE_STOPPING) { 1453 status = -ECANCELED; 1454 break; 1455 } 1456 1457 if (j) { 1458 packet->info.rx.rx_flags |= HTC_RX_PKT_REFRESH_HDR; 1459 packet->info.rx.exp_hdr = 0xFFFFFFFF; 1460 } else 1461 /* set expected look ahead */ 1462 packet->info.rx.exp_hdr = *lk_ahds; 1463 1464 packet->act_len = le16_to_cpu(htc_hdr->payld_len) + 1465 HTC_HDR_LENGTH; 1466 } 1467 1468 return status; 1469 } 1470 1471 static int ath6kl_htc_rx_alloc(struct htc_target *target, 1472 u32 lk_ahds[], int msg, 1473 struct htc_endpoint *endpoint, 1474 struct list_head *queue) 1475 { 1476 int status = 0; 1477 struct htc_packet *packet, *tmp_pkt; 1478 struct htc_frame_hdr *htc_hdr; 1479 int i, n_msg; 1480 1481 spin_lock_bh(&target->rx_lock); 1482 1483 for (i = 0; i < msg; i++) { 1484 htc_hdr = (struct htc_frame_hdr *)&lk_ahds[i]; 1485 1486 if (htc_hdr->eid >= ENDPOINT_MAX) { 1487 ath6kl_err("invalid ep in look-ahead: %d\n", 1488 htc_hdr->eid); 1489 status = -ENOMEM; 1490 break; 1491 } 1492 1493 if (htc_hdr->eid != endpoint->eid) { 1494 ath6kl_err("invalid ep in look-ahead: %d should be : %d (index:%d)\n", 1495 htc_hdr->eid, endpoint->eid, i); 1496 status = -ENOMEM; 1497 break; 1498 } 1499 1500 if (le16_to_cpu(htc_hdr->payld_len) > HTC_MAX_PAYLOAD_LENGTH) { 1501 ath6kl_err("payload len %d exceeds max htc : %d !\n", 1502 htc_hdr->payld_len, 1503 (u32) HTC_MAX_PAYLOAD_LENGTH); 1504 status = -ENOMEM; 1505 break; 1506 } 1507 1508 if (endpoint->svc_id == 0) { 1509 ath6kl_err("ep %d is not connected !\n", htc_hdr->eid); 1510 status = -ENOMEM; 1511 break; 1512 } 1513 1514 if (htc_hdr->flags & HTC_FLG_RX_BNDL_CNT) { 1515 /* 1516 * HTC header indicates that every packet to follow 1517 * has the same padded length so that it can be 1518 * optimally fetched as a full bundle. 1519 */ 1520 n_msg = (htc_hdr->flags & HTC_FLG_RX_BNDL_CNT) >> 1521 HTC_FLG_RX_BNDL_CNT_S; 1522 1523 /* the count doesn't include the starter frame */ 1524 n_msg++; 1525 if (n_msg > target->msg_per_bndl_max) { 1526 status = -ENOMEM; 1527 break; 1528 } 1529 1530 endpoint->ep_st.rx_bundle_from_hdr += 1; 1531 ath6kl_dbg(ATH6KL_DBG_HTC, 1532 "htc rx bundle pkts %d\n", 1533 n_msg); 1534 } else 1535 /* HTC header only indicates 1 message to fetch */ 1536 n_msg = 1; 1537 1538 /* Setup packet buffers for each message */ 1539 status = ath6kl_htc_rx_setup(target, endpoint, &lk_ahds[i], 1540 queue, n_msg); 1541 1542 /* 1543 * This is due to unavailabilty of buffers to rx entire data. 1544 * Return no error so that free buffers from queue can be used 1545 * to receive partial data. 1546 */ 1547 if (status == -ENOSPC) { 1548 spin_unlock_bh(&target->rx_lock); 1549 return 0; 1550 } 1551 1552 if (status) 1553 break; 1554 } 1555 1556 spin_unlock_bh(&target->rx_lock); 1557 1558 if (status) { 1559 list_for_each_entry_safe(packet, tmp_pkt, queue, list) { 1560 list_del(&packet->list); 1561 htc_reclaim_rxbuf(target, packet, 1562 &target->endpoint[packet->endpoint]); 1563 } 1564 } 1565 1566 return status; 1567 } 1568 1569 static void htc_ctrl_rx(struct htc_target *context, struct htc_packet *packets) 1570 { 1571 if (packets->endpoint != ENDPOINT_0) { 1572 WARN_ON(1); 1573 return; 1574 } 1575 1576 if (packets->status == -ECANCELED) { 1577 reclaim_rx_ctrl_buf(context, packets); 1578 return; 1579 } 1580 1581 if (packets->act_len > 0) { 1582 ath6kl_err("htc_ctrl_rx, got message with len:%zu\n", 1583 packets->act_len + HTC_HDR_LENGTH); 1584 1585 ath6kl_dbg_dump(ATH6KL_DBG_HTC, 1586 "htc rx unexpected endpoint 0 message", "", 1587 packets->buf - HTC_HDR_LENGTH, 1588 packets->act_len + HTC_HDR_LENGTH); 1589 } 1590 1591 htc_reclaim_rxbuf(context, packets, &context->endpoint[0]); 1592 } 1593 1594 static void htc_proc_cred_rpt(struct htc_target *target, 1595 struct htc_credit_report *rpt, 1596 int n_entries, 1597 enum htc_endpoint_id from_ep) 1598 { 1599 struct htc_endpoint *endpoint; 1600 int tot_credits = 0, i; 1601 bool dist = false; 1602 1603 spin_lock_bh(&target->tx_lock); 1604 1605 for (i = 0; i < n_entries; i++, rpt++) { 1606 if (rpt->eid >= ENDPOINT_MAX) { 1607 WARN_ON(1); 1608 spin_unlock_bh(&target->tx_lock); 1609 return; 1610 } 1611 1612 endpoint = &target->endpoint[rpt->eid]; 1613 1614 ath6kl_dbg(ATH6KL_DBG_CREDIT, 1615 "credit report ep %d credits %d\n", 1616 rpt->eid, rpt->credits); 1617 1618 endpoint->ep_st.tx_cred_rpt += 1; 1619 endpoint->ep_st.cred_retnd += rpt->credits; 1620 1621 if (from_ep == rpt->eid) { 1622 /* 1623 * This credit report arrived on the same endpoint 1624 * indicating it arrived in an RX packet. 1625 */ 1626 endpoint->ep_st.cred_from_rx += rpt->credits; 1627 endpoint->ep_st.cred_rpt_from_rx += 1; 1628 } else if (from_ep == ENDPOINT_0) { 1629 /* credit arrived on endpoint 0 as a NULL message */ 1630 endpoint->ep_st.cred_from_ep0 += rpt->credits; 1631 endpoint->ep_st.cred_rpt_ep0 += 1; 1632 } else { 1633 endpoint->ep_st.cred_from_other += rpt->credits; 1634 endpoint->ep_st.cred_rpt_from_other += 1; 1635 } 1636 1637 if (rpt->eid == ENDPOINT_0) 1638 /* always give endpoint 0 credits back */ 1639 endpoint->cred_dist.credits += rpt->credits; 1640 else { 1641 endpoint->cred_dist.cred_to_dist += rpt->credits; 1642 dist = true; 1643 } 1644 1645 /* 1646 * Refresh tx depth for distribution function that will 1647 * recover these credits NOTE: this is only valid when 1648 * there are credits to recover! 1649 */ 1650 endpoint->cred_dist.txq_depth = 1651 get_queue_depth(&endpoint->txq); 1652 1653 tot_credits += rpt->credits; 1654 } 1655 1656 if (dist) { 1657 /* 1658 * This was a credit return based on a completed send 1659 * operations note, this is done with the lock held 1660 */ 1661 ath6kl_credit_distribute(target->credit_info, 1662 &target->cred_dist_list, 1663 HTC_CREDIT_DIST_SEND_COMPLETE); 1664 } 1665 1666 spin_unlock_bh(&target->tx_lock); 1667 1668 if (tot_credits) 1669 htc_chk_ep_txq(target); 1670 } 1671 1672 static int htc_parse_trailer(struct htc_target *target, 1673 struct htc_record_hdr *record, 1674 u8 *record_buf, u32 *next_lk_ahds, 1675 enum htc_endpoint_id endpoint, 1676 int *n_lk_ahds) 1677 { 1678 struct htc_bundle_lkahd_rpt *bundle_lkahd_rpt; 1679 struct htc_lookahead_report *lk_ahd; 1680 int len; 1681 1682 switch (record->rec_id) { 1683 case HTC_RECORD_CREDITS: 1684 len = record->len / sizeof(struct htc_credit_report); 1685 if (!len) { 1686 WARN_ON(1); 1687 return -EINVAL; 1688 } 1689 1690 htc_proc_cred_rpt(target, 1691 (struct htc_credit_report *) record_buf, 1692 len, endpoint); 1693 break; 1694 case HTC_RECORD_LOOKAHEAD: 1695 len = record->len / sizeof(*lk_ahd); 1696 if (!len) { 1697 WARN_ON(1); 1698 return -EINVAL; 1699 } 1700 1701 lk_ahd = (struct htc_lookahead_report *) record_buf; 1702 if ((lk_ahd->pre_valid == ((~lk_ahd->post_valid) & 0xFF)) && 1703 next_lk_ahds) { 1704 ath6kl_dbg(ATH6KL_DBG_HTC, 1705 "htc rx lk_ahd found pre_valid 0x%x post_valid 0x%x\n", 1706 lk_ahd->pre_valid, lk_ahd->post_valid); 1707 1708 /* look ahead bytes are valid, copy them over */ 1709 memcpy((u8 *)&next_lk_ahds[0], lk_ahd->lk_ahd, 4); 1710 1711 ath6kl_dbg_dump(ATH6KL_DBG_HTC, 1712 "htc rx next look ahead", 1713 "", next_lk_ahds, 4); 1714 1715 *n_lk_ahds = 1; 1716 } 1717 break; 1718 case HTC_RECORD_LOOKAHEAD_BUNDLE: 1719 len = record->len / sizeof(*bundle_lkahd_rpt); 1720 if (!len || (len > HTC_HOST_MAX_MSG_PER_BUNDLE)) { 1721 WARN_ON(1); 1722 return -EINVAL; 1723 } 1724 1725 if (next_lk_ahds) { 1726 int i; 1727 1728 bundle_lkahd_rpt = 1729 (struct htc_bundle_lkahd_rpt *) record_buf; 1730 1731 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bundle lk_ahd", 1732 "", record_buf, record->len); 1733 1734 for (i = 0; i < len; i++) { 1735 memcpy((u8 *)&next_lk_ahds[i], 1736 bundle_lkahd_rpt->lk_ahd, 4); 1737 bundle_lkahd_rpt++; 1738 } 1739 1740 *n_lk_ahds = i; 1741 } 1742 break; 1743 default: 1744 ath6kl_err("unhandled record: id:%d len:%d\n", 1745 record->rec_id, record->len); 1746 break; 1747 } 1748 1749 return 0; 1750 } 1751 1752 static int htc_proc_trailer(struct htc_target *target, 1753 u8 *buf, int len, u32 *next_lk_ahds, 1754 int *n_lk_ahds, enum htc_endpoint_id endpoint) 1755 { 1756 struct htc_record_hdr *record; 1757 int orig_len; 1758 int status; 1759 u8 *record_buf; 1760 u8 *orig_buf; 1761 1762 ath6kl_dbg(ATH6KL_DBG_HTC, "htc rx trailer len %d\n", len); 1763 ath6kl_dbg_dump(ATH6KL_DBG_HTC, NULL, "", buf, len); 1764 1765 orig_buf = buf; 1766 orig_len = len; 1767 status = 0; 1768 1769 while (len > 0) { 1770 if (len < sizeof(struct htc_record_hdr)) { 1771 status = -ENOMEM; 1772 break; 1773 } 1774 /* these are byte aligned structs */ 1775 record = (struct htc_record_hdr *) buf; 1776 len -= sizeof(struct htc_record_hdr); 1777 buf += sizeof(struct htc_record_hdr); 1778 1779 if (record->len > len) { 1780 ath6kl_err("invalid record len: %d (id:%d) buf has: %d bytes left\n", 1781 record->len, record->rec_id, len); 1782 status = -ENOMEM; 1783 break; 1784 } 1785 record_buf = buf; 1786 1787 status = htc_parse_trailer(target, record, record_buf, 1788 next_lk_ahds, endpoint, n_lk_ahds); 1789 1790 if (status) 1791 break; 1792 1793 /* advance buffer past this record for next time around */ 1794 buf += record->len; 1795 len -= record->len; 1796 } 1797 1798 if (status) 1799 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bad trailer", 1800 "", orig_buf, orig_len); 1801 1802 return status; 1803 } 1804 1805 static int ath6kl_htc_rx_process_hdr(struct htc_target *target, 1806 struct htc_packet *packet, 1807 u32 *next_lkahds, int *n_lkahds) 1808 { 1809 int status = 0; 1810 u16 payload_len; 1811 u32 lk_ahd; 1812 struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)packet->buf; 1813 1814 if (n_lkahds != NULL) 1815 *n_lkahds = 0; 1816 1817 /* 1818 * NOTE: we cannot assume the alignment of buf, so we use the safe 1819 * macros to retrieve 16 bit fields. 1820 */ 1821 payload_len = le16_to_cpu(get_unaligned(&htc_hdr->payld_len)); 1822 1823 memcpy((u8 *)&lk_ahd, packet->buf, sizeof(lk_ahd)); 1824 1825 if (packet->info.rx.rx_flags & HTC_RX_PKT_REFRESH_HDR) { 1826 /* 1827 * Refresh the expected header and the actual length as it 1828 * was unknown when this packet was grabbed as part of the 1829 * bundle. 1830 */ 1831 packet->info.rx.exp_hdr = lk_ahd; 1832 packet->act_len = payload_len + HTC_HDR_LENGTH; 1833 1834 /* validate the actual header that was refreshed */ 1835 if (packet->act_len > packet->buf_len) { 1836 ath6kl_err("refreshed hdr payload len (%d) in bundled recv is invalid (hdr: 0x%X)\n", 1837 payload_len, lk_ahd); 1838 /* 1839 * Limit this to max buffer just to print out some 1840 * of the buffer. 1841 */ 1842 packet->act_len = min(packet->act_len, packet->buf_len); 1843 status = -ENOMEM; 1844 goto fail_rx; 1845 } 1846 1847 if (packet->endpoint != htc_hdr->eid) { 1848 ath6kl_err("refreshed hdr ep (%d) does not match expected ep (%d)\n", 1849 htc_hdr->eid, packet->endpoint); 1850 status = -ENOMEM; 1851 goto fail_rx; 1852 } 1853 } 1854 1855 if (lk_ahd != packet->info.rx.exp_hdr) { 1856 ath6kl_err("%s(): lk_ahd mismatch! (pPkt:0x%p flags:0x%X)\n", 1857 __func__, packet, packet->info.rx.rx_flags); 1858 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx expected lk_ahd", 1859 "", &packet->info.rx.exp_hdr, 4); 1860 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx current header", 1861 "", (u8 *)&lk_ahd, sizeof(lk_ahd)); 1862 status = -ENOMEM; 1863 goto fail_rx; 1864 } 1865 1866 if (htc_hdr->flags & HTC_FLG_RX_TRAILER) { 1867 if (htc_hdr->ctrl[0] < sizeof(struct htc_record_hdr) || 1868 htc_hdr->ctrl[0] > payload_len) { 1869 ath6kl_err("%s(): invalid hdr (payload len should be :%d, CB[0] is:%d)\n", 1870 __func__, payload_len, htc_hdr->ctrl[0]); 1871 status = -ENOMEM; 1872 goto fail_rx; 1873 } 1874 1875 if (packet->info.rx.rx_flags & HTC_RX_PKT_IGNORE_LOOKAHEAD) { 1876 next_lkahds = NULL; 1877 n_lkahds = NULL; 1878 } 1879 1880 status = htc_proc_trailer(target, packet->buf + HTC_HDR_LENGTH 1881 + payload_len - htc_hdr->ctrl[0], 1882 htc_hdr->ctrl[0], next_lkahds, 1883 n_lkahds, packet->endpoint); 1884 1885 if (status) 1886 goto fail_rx; 1887 1888 packet->act_len -= htc_hdr->ctrl[0]; 1889 } 1890 1891 packet->buf += HTC_HDR_LENGTH; 1892 packet->act_len -= HTC_HDR_LENGTH; 1893 1894 fail_rx: 1895 if (status) 1896 ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bad packet", 1897 "", packet->buf, packet->act_len); 1898 1899 return status; 1900 } 1901 1902 static void ath6kl_htc_rx_complete(struct htc_endpoint *endpoint, 1903 struct htc_packet *packet) 1904 { 1905 ath6kl_dbg(ATH6KL_DBG_HTC, 1906 "htc rx complete ep %d packet 0x%p\n", 1907 endpoint->eid, packet); 1908 1909 endpoint->ep_cb.rx(endpoint->target, packet); 1910 } 1911 1912 static int ath6kl_htc_rx_bundle(struct htc_target *target, 1913 struct list_head *rxq, 1914 struct list_head *sync_compq, 1915 int *n_pkt_fetched, bool part_bundle) 1916 { 1917 struct hif_scatter_req *scat_req; 1918 struct htc_packet *packet; 1919 int rem_space = target->max_rx_bndl_sz; 1920 int n_scat_pkt, status = 0, i, len; 1921 1922 n_scat_pkt = get_queue_depth(rxq); 1923 n_scat_pkt = min(n_scat_pkt, target->msg_per_bndl_max); 1924 1925 if ((get_queue_depth(rxq) - n_scat_pkt) > 0) { 1926 /* 1927 * We were forced to split this bundle receive operation 1928 * all packets in this partial bundle must have their 1929 * lookaheads ignored. 1930 */ 1931 part_bundle = true; 1932 1933 /* 1934 * This would only happen if the target ignored our max 1935 * bundle limit. 1936 */ 1937 ath6kl_warn("%s(): partial bundle detected num:%d , %d\n", 1938 __func__, get_queue_depth(rxq), n_scat_pkt); 1939 } 1940 1941 len = 0; 1942 1943 ath6kl_dbg(ATH6KL_DBG_HTC, 1944 "htc rx bundle depth %d pkts %d\n", 1945 get_queue_depth(rxq), n_scat_pkt); 1946 1947 scat_req = hif_scatter_req_get(target->dev->ar); 1948 1949 if (scat_req == NULL) 1950 goto fail_rx_pkt; 1951 1952 for (i = 0; i < n_scat_pkt; i++) { 1953 int pad_len; 1954 1955 packet = list_first_entry(rxq, struct htc_packet, list); 1956 list_del(&packet->list); 1957 1958 pad_len = CALC_TXRX_PADDED_LEN(target, 1959 packet->act_len); 1960 1961 if ((rem_space - pad_len) < 0) { 1962 list_add(&packet->list, rxq); 1963 break; 1964 } 1965 1966 rem_space -= pad_len; 1967 1968 if (part_bundle || (i < (n_scat_pkt - 1))) 1969 /* 1970 * Packet 0..n-1 cannot be checked for look-aheads 1971 * since we are fetching a bundle the last packet 1972 * however can have it's lookahead used 1973 */ 1974 packet->info.rx.rx_flags |= 1975 HTC_RX_PKT_IGNORE_LOOKAHEAD; 1976 1977 /* NOTE: 1 HTC packet per scatter entry */ 1978 scat_req->scat_list[i].buf = packet->buf; 1979 scat_req->scat_list[i].len = pad_len; 1980 1981 packet->info.rx.rx_flags |= HTC_RX_PKT_PART_OF_BUNDLE; 1982 1983 list_add_tail(&packet->list, sync_compq); 1984 1985 WARN_ON(!scat_req->scat_list[i].len); 1986 len += scat_req->scat_list[i].len; 1987 } 1988 1989 scat_req->len = len; 1990 scat_req->scat_entries = i; 1991 1992 status = ath6kl_hif_submit_scat_req(target->dev, scat_req, true); 1993 1994 if (!status) 1995 *n_pkt_fetched = i; 1996 1997 /* free scatter request */ 1998 hif_scatter_req_add(target->dev->ar, scat_req); 1999 2000 fail_rx_pkt: 2001 2002 return status; 2003 } 2004 2005 static int ath6kl_htc_rx_process_packets(struct htc_target *target, 2006 struct list_head *comp_pktq, 2007 u32 lk_ahds[], 2008 int *n_lk_ahd) 2009 { 2010 struct htc_packet *packet, *tmp_pkt; 2011 struct htc_endpoint *ep; 2012 int status = 0; 2013 2014 list_for_each_entry_safe(packet, tmp_pkt, comp_pktq, list) { 2015 ep = &target->endpoint[packet->endpoint]; 2016 2017 trace_ath6kl_htc_rx(packet->status, packet->endpoint, 2018 packet->buf, packet->act_len); 2019 2020 /* process header for each of the recv packet */ 2021 status = ath6kl_htc_rx_process_hdr(target, packet, lk_ahds, 2022 n_lk_ahd); 2023 if (status) 2024 return status; 2025 2026 list_del(&packet->list); 2027 2028 if (list_empty(comp_pktq)) { 2029 /* 2030 * Last packet's more packet flag is set 2031 * based on the lookahead. 2032 */ 2033 if (*n_lk_ahd > 0) 2034 ath6kl_htc_rx_set_indicate(lk_ahds[0], 2035 ep, packet); 2036 } else 2037 /* 2038 * Packets in a bundle automatically have 2039 * this flag set. 2040 */ 2041 packet->info.rx.indicat_flags |= 2042 HTC_RX_FLAGS_INDICATE_MORE_PKTS; 2043 2044 ath6kl_htc_rx_update_stats(ep, *n_lk_ahd); 2045 2046 if (packet->info.rx.rx_flags & HTC_RX_PKT_PART_OF_BUNDLE) 2047 ep->ep_st.rx_bundl += 1; 2048 2049 ath6kl_htc_rx_complete(ep, packet); 2050 } 2051 2052 return status; 2053 } 2054 2055 static int ath6kl_htc_rx_fetch(struct htc_target *target, 2056 struct list_head *rx_pktq, 2057 struct list_head *comp_pktq) 2058 { 2059 int fetched_pkts; 2060 bool part_bundle = false; 2061 int status = 0; 2062 struct list_head tmp_rxq; 2063 struct htc_packet *packet, *tmp_pkt; 2064 2065 /* now go fetch the list of HTC packets */ 2066 while (!list_empty(rx_pktq)) { 2067 fetched_pkts = 0; 2068 2069 INIT_LIST_HEAD(&tmp_rxq); 2070 2071 if (target->rx_bndl_enable && (get_queue_depth(rx_pktq) > 1)) { 2072 /* 2073 * There are enough packets to attempt a 2074 * bundle transfer and recv bundling is 2075 * allowed. 2076 */ 2077 status = ath6kl_htc_rx_bundle(target, rx_pktq, 2078 &tmp_rxq, 2079 &fetched_pkts, 2080 part_bundle); 2081 if (status) 2082 goto fail_rx; 2083 2084 if (!list_empty(rx_pktq)) 2085 part_bundle = true; 2086 2087 list_splice_tail_init(&tmp_rxq, comp_pktq); 2088 } 2089 2090 if (!fetched_pkts) { 2091 packet = list_first_entry(rx_pktq, struct htc_packet, 2092 list); 2093 2094 /* fully synchronous */ 2095 packet->completion = NULL; 2096 2097 if (!list_is_singular(rx_pktq)) 2098 /* 2099 * look_aheads in all packet 2100 * except the last one in the 2101 * bundle must be ignored 2102 */ 2103 packet->info.rx.rx_flags |= 2104 HTC_RX_PKT_IGNORE_LOOKAHEAD; 2105 2106 /* go fetch the packet */ 2107 status = ath6kl_htc_rx_packet(target, packet, 2108 packet->act_len); 2109 2110 list_move_tail(&packet->list, &tmp_rxq); 2111 2112 if (status) 2113 goto fail_rx; 2114 2115 list_splice_tail_init(&tmp_rxq, comp_pktq); 2116 } 2117 } 2118 2119 return 0; 2120 2121 fail_rx: 2122 2123 /* 2124 * Cleanup any packets we allocated but didn't use to 2125 * actually fetch any packets. 2126 */ 2127 2128 list_for_each_entry_safe(packet, tmp_pkt, rx_pktq, list) { 2129 list_del(&packet->list); 2130 htc_reclaim_rxbuf(target, packet, 2131 &target->endpoint[packet->endpoint]); 2132 } 2133 2134 list_for_each_entry_safe(packet, tmp_pkt, &tmp_rxq, list) { 2135 list_del(&packet->list); 2136 htc_reclaim_rxbuf(target, packet, 2137 &target->endpoint[packet->endpoint]); 2138 } 2139 2140 return status; 2141 } 2142 2143 int ath6kl_htc_rxmsg_pending_handler(struct htc_target *target, 2144 u32 msg_look_ahead, int *num_pkts) 2145 { 2146 struct htc_packet *packets, *tmp_pkt; 2147 struct htc_endpoint *endpoint; 2148 struct list_head rx_pktq, comp_pktq; 2149 int status = 0; 2150 u32 look_aheads[HTC_HOST_MAX_MSG_PER_BUNDLE]; 2151 int num_look_ahead = 1; 2152 enum htc_endpoint_id id; 2153 int n_fetched = 0; 2154 2155 INIT_LIST_HEAD(&comp_pktq); 2156 *num_pkts = 0; 2157 2158 /* 2159 * On first entry copy the look_aheads into our temp array for 2160 * processing 2161 */ 2162 look_aheads[0] = msg_look_ahead; 2163 2164 while (true) { 2165 /* 2166 * First lookahead sets the expected endpoint IDs for all 2167 * packets in a bundle. 2168 */ 2169 id = ((struct htc_frame_hdr *)&look_aheads[0])->eid; 2170 endpoint = &target->endpoint[id]; 2171 2172 if (id >= ENDPOINT_MAX) { 2173 ath6kl_err("MsgPend, invalid endpoint in look-ahead: %d\n", 2174 id); 2175 status = -ENOMEM; 2176 break; 2177 } 2178 2179 INIT_LIST_HEAD(&rx_pktq); 2180 INIT_LIST_HEAD(&comp_pktq); 2181 2182 /* 2183 * Try to allocate as many HTC RX packets indicated by the 2184 * look_aheads. 2185 */ 2186 status = ath6kl_htc_rx_alloc(target, look_aheads, 2187 num_look_ahead, endpoint, 2188 &rx_pktq); 2189 if (status) 2190 break; 2191 2192 if (get_queue_depth(&rx_pktq) >= 2) 2193 /* 2194 * A recv bundle was detected, force IRQ status 2195 * re-check again 2196 */ 2197 target->chk_irq_status_cnt = 1; 2198 2199 n_fetched += get_queue_depth(&rx_pktq); 2200 2201 num_look_ahead = 0; 2202 2203 status = ath6kl_htc_rx_fetch(target, &rx_pktq, &comp_pktq); 2204 2205 if (!status) 2206 ath6kl_htc_rx_chk_water_mark(endpoint); 2207 2208 /* Process fetched packets */ 2209 status = ath6kl_htc_rx_process_packets(target, &comp_pktq, 2210 look_aheads, 2211 &num_look_ahead); 2212 2213 if (!num_look_ahead || status) 2214 break; 2215 2216 /* 2217 * For SYNCH processing, if we get here, we are running 2218 * through the loop again due to a detected lookahead. Set 2219 * flag that we should re-check IRQ status registers again 2220 * before leaving IRQ processing, this can net better 2221 * performance in high throughput situations. 2222 */ 2223 target->chk_irq_status_cnt = 1; 2224 } 2225 2226 if (status) { 2227 ath6kl_err("failed to get pending recv messages: %d\n", 2228 status); 2229 2230 /* cleanup any packets in sync completion queue */ 2231 list_for_each_entry_safe(packets, tmp_pkt, &comp_pktq, list) { 2232 list_del(&packets->list); 2233 htc_reclaim_rxbuf(target, packets, 2234 &target->endpoint[packets->endpoint]); 2235 } 2236 2237 if (target->htc_flags & HTC_OP_STATE_STOPPING) { 2238 ath6kl_warn("host is going to stop blocking receiver for htc_stop\n"); 2239 ath6kl_hif_rx_control(target->dev, false); 2240 } 2241 } 2242 2243 /* 2244 * Before leaving, check to see if host ran out of buffers and 2245 * needs to stop the receiver. 2246 */ 2247 if (target->rx_st_flags & HTC_RECV_WAIT_BUFFERS) { 2248 ath6kl_warn("host has no rx buffers blocking receiver to prevent overrun\n"); 2249 ath6kl_hif_rx_control(target->dev, false); 2250 } 2251 *num_pkts = n_fetched; 2252 2253 return status; 2254 } 2255 2256 /* 2257 * Synchronously wait for a control message from the target, 2258 * This function is used at initialization time ONLY. At init messages 2259 * on ENDPOINT 0 are expected. 2260 */ 2261 static struct htc_packet *htc_wait_for_ctrl_msg(struct htc_target *target) 2262 { 2263 struct htc_packet *packet = NULL; 2264 struct htc_frame_hdr *htc_hdr; 2265 u32 look_ahead; 2266 2267 if (ath6kl_hif_poll_mboxmsg_rx(target->dev, &look_ahead, 2268 HTC_TARGET_RESPONSE_TIMEOUT)) 2269 return NULL; 2270 2271 ath6kl_dbg(ATH6KL_DBG_HTC, 2272 "htc rx wait ctrl look_ahead 0x%X\n", look_ahead); 2273 2274 htc_hdr = (struct htc_frame_hdr *)&look_ahead; 2275 2276 if (htc_hdr->eid != ENDPOINT_0) 2277 return NULL; 2278 2279 packet = htc_get_control_buf(target, false); 2280 2281 if (!packet) 2282 return NULL; 2283 2284 packet->info.rx.rx_flags = 0; 2285 packet->info.rx.exp_hdr = look_ahead; 2286 packet->act_len = le16_to_cpu(htc_hdr->payld_len) + HTC_HDR_LENGTH; 2287 2288 if (packet->act_len > packet->buf_len) 2289 goto fail_ctrl_rx; 2290 2291 /* we want synchronous operation */ 2292 packet->completion = NULL; 2293 2294 /* get the message from the device, this will block */ 2295 if (ath6kl_htc_rx_packet(target, packet, packet->act_len)) 2296 goto fail_ctrl_rx; 2297 2298 trace_ath6kl_htc_rx(packet->status, packet->endpoint, 2299 packet->buf, packet->act_len); 2300 2301 /* process receive header */ 2302 packet->status = ath6kl_htc_rx_process_hdr(target, packet, NULL, NULL); 2303 2304 if (packet->status) { 2305 ath6kl_err("htc_wait_for_ctrl_msg, ath6kl_htc_rx_process_hdr failed (status = %d)\n", 2306 packet->status); 2307 goto fail_ctrl_rx; 2308 } 2309 2310 return packet; 2311 2312 fail_ctrl_rx: 2313 if (packet != NULL) { 2314 htc_rxpkt_reset(packet); 2315 reclaim_rx_ctrl_buf(target, packet); 2316 } 2317 2318 return NULL; 2319 } 2320 2321 static int ath6kl_htc_mbox_add_rxbuf_multiple(struct htc_target *target, 2322 struct list_head *pkt_queue) 2323 { 2324 struct htc_endpoint *endpoint; 2325 struct htc_packet *first_pkt; 2326 bool rx_unblock = false; 2327 int status = 0, depth; 2328 2329 if (list_empty(pkt_queue)) 2330 return -ENOMEM; 2331 2332 first_pkt = list_first_entry(pkt_queue, struct htc_packet, list); 2333 2334 if (first_pkt->endpoint >= ENDPOINT_MAX) 2335 return status; 2336 2337 depth = get_queue_depth(pkt_queue); 2338 2339 ath6kl_dbg(ATH6KL_DBG_HTC, 2340 "htc rx add multiple ep id %d cnt %d len %d\n", 2341 first_pkt->endpoint, depth, first_pkt->buf_len); 2342 2343 endpoint = &target->endpoint[first_pkt->endpoint]; 2344 2345 if (target->htc_flags & HTC_OP_STATE_STOPPING) { 2346 struct htc_packet *packet, *tmp_pkt; 2347 2348 /* walk through queue and mark each one canceled */ 2349 list_for_each_entry_safe(packet, tmp_pkt, pkt_queue, list) { 2350 packet->status = -ECANCELED; 2351 list_del(&packet->list); 2352 ath6kl_htc_rx_complete(endpoint, packet); 2353 } 2354 2355 return status; 2356 } 2357 2358 spin_lock_bh(&target->rx_lock); 2359 2360 list_splice_tail_init(pkt_queue, &endpoint->rx_bufq); 2361 2362 /* check if we are blocked waiting for a new buffer */ 2363 if (target->rx_st_flags & HTC_RECV_WAIT_BUFFERS) { 2364 if (target->ep_waiting == first_pkt->endpoint) { 2365 ath6kl_dbg(ATH6KL_DBG_HTC, 2366 "htc rx blocked on ep %d, unblocking\n", 2367 target->ep_waiting); 2368 target->rx_st_flags &= ~HTC_RECV_WAIT_BUFFERS; 2369 target->ep_waiting = ENDPOINT_MAX; 2370 rx_unblock = true; 2371 } 2372 } 2373 2374 spin_unlock_bh(&target->rx_lock); 2375 2376 if (rx_unblock && !(target->htc_flags & HTC_OP_STATE_STOPPING)) 2377 /* TODO : implement a buffer threshold count? */ 2378 ath6kl_hif_rx_control(target->dev, true); 2379 2380 return status; 2381 } 2382 2383 static void ath6kl_htc_mbox_flush_rx_buf(struct htc_target *target) 2384 { 2385 struct htc_endpoint *endpoint; 2386 struct htc_packet *packet, *tmp_pkt; 2387 int i; 2388 2389 for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) { 2390 endpoint = &target->endpoint[i]; 2391 if (!endpoint->svc_id) 2392 /* not in use.. */ 2393 continue; 2394 2395 spin_lock_bh(&target->rx_lock); 2396 list_for_each_entry_safe(packet, tmp_pkt, 2397 &endpoint->rx_bufq, list) { 2398 list_del(&packet->list); 2399 spin_unlock_bh(&target->rx_lock); 2400 ath6kl_dbg(ATH6KL_DBG_HTC, 2401 "htc rx flush pkt 0x%p len %d ep %d\n", 2402 packet, packet->buf_len, 2403 packet->endpoint); 2404 /* 2405 * packets in rx_bufq of endpoint 0 have originally 2406 * been queued from target->free_ctrl_rxbuf where 2407 * packet and packet->buf_start are allocated 2408 * separately using kmalloc(). For other endpoint 2409 * rx_bufq, it is allocated as skb where packet is 2410 * skb->head. Take care of this difference while freeing 2411 * the memory. 2412 */ 2413 if (packet->endpoint == ENDPOINT_0) { 2414 kfree(packet->buf_start); 2415 kfree(packet); 2416 } else { 2417 dev_kfree_skb(packet->pkt_cntxt); 2418 } 2419 spin_lock_bh(&target->rx_lock); 2420 } 2421 spin_unlock_bh(&target->rx_lock); 2422 } 2423 } 2424 2425 static int ath6kl_htc_mbox_conn_service(struct htc_target *target, 2426 struct htc_service_connect_req *conn_req, 2427 struct htc_service_connect_resp *conn_resp) 2428 { 2429 struct htc_packet *rx_pkt = NULL; 2430 struct htc_packet *tx_pkt = NULL; 2431 struct htc_conn_service_resp *resp_msg; 2432 struct htc_conn_service_msg *conn_msg; 2433 struct htc_endpoint *endpoint; 2434 enum htc_endpoint_id assigned_ep = ENDPOINT_MAX; 2435 unsigned int max_msg_sz = 0; 2436 int status = 0; 2437 u16 msg_id; 2438 2439 ath6kl_dbg(ATH6KL_DBG_HTC, 2440 "htc connect service target 0x%p service id 0x%x\n", 2441 target, conn_req->svc_id); 2442 2443 if (conn_req->svc_id == HTC_CTRL_RSVD_SVC) { 2444 /* special case for pseudo control service */ 2445 assigned_ep = ENDPOINT_0; 2446 max_msg_sz = HTC_MAX_CTRL_MSG_LEN; 2447 } else { 2448 /* allocate a packet to send to the target */ 2449 tx_pkt = htc_get_control_buf(target, true); 2450 2451 if (!tx_pkt) 2452 return -ENOMEM; 2453 2454 conn_msg = (struct htc_conn_service_msg *)tx_pkt->buf; 2455 memset(conn_msg, 0, sizeof(*conn_msg)); 2456 conn_msg->msg_id = cpu_to_le16(HTC_MSG_CONN_SVC_ID); 2457 conn_msg->svc_id = cpu_to_le16(conn_req->svc_id); 2458 conn_msg->conn_flags = cpu_to_le16(conn_req->conn_flags); 2459 2460 set_htc_pkt_info(tx_pkt, NULL, (u8 *) conn_msg, 2461 sizeof(*conn_msg) + conn_msg->svc_meta_len, 2462 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG); 2463 2464 /* we want synchronous operation */ 2465 tx_pkt->completion = NULL; 2466 ath6kl_htc_tx_prep_pkt(tx_pkt, 0, 0, 0); 2467 status = ath6kl_htc_tx_issue(target, tx_pkt); 2468 2469 if (status) 2470 goto fail_tx; 2471 2472 /* wait for response */ 2473 rx_pkt = htc_wait_for_ctrl_msg(target); 2474 2475 if (!rx_pkt) { 2476 status = -ENOMEM; 2477 goto fail_tx; 2478 } 2479 2480 resp_msg = (struct htc_conn_service_resp *)rx_pkt->buf; 2481 msg_id = le16_to_cpu(resp_msg->msg_id); 2482 2483 if ((msg_id != HTC_MSG_CONN_SVC_RESP_ID) || 2484 (rx_pkt->act_len < sizeof(*resp_msg))) { 2485 status = -ENOMEM; 2486 goto fail_tx; 2487 } 2488 2489 conn_resp->resp_code = resp_msg->status; 2490 /* check response status */ 2491 if (resp_msg->status != HTC_SERVICE_SUCCESS) { 2492 ath6kl_err("target failed service 0x%X connect request (status:%d)\n", 2493 resp_msg->svc_id, resp_msg->status); 2494 status = -ENOMEM; 2495 goto fail_tx; 2496 } 2497 2498 assigned_ep = (enum htc_endpoint_id)resp_msg->eid; 2499 max_msg_sz = le16_to_cpu(resp_msg->max_msg_sz); 2500 } 2501 2502 if (WARN_ON_ONCE(assigned_ep == ENDPOINT_UNUSED || 2503 assigned_ep >= ENDPOINT_MAX || !max_msg_sz)) { 2504 status = -ENOMEM; 2505 goto fail_tx; 2506 } 2507 2508 endpoint = &target->endpoint[assigned_ep]; 2509 endpoint->eid = assigned_ep; 2510 if (endpoint->svc_id) { 2511 status = -ENOMEM; 2512 goto fail_tx; 2513 } 2514 2515 /* return assigned endpoint to caller */ 2516 conn_resp->endpoint = assigned_ep; 2517 conn_resp->len_max = max_msg_sz; 2518 2519 /* setup the endpoint */ 2520 2521 /* this marks the endpoint in use */ 2522 endpoint->svc_id = conn_req->svc_id; 2523 2524 endpoint->max_txq_depth = conn_req->max_txq_depth; 2525 endpoint->len_max = max_msg_sz; 2526 endpoint->ep_cb = conn_req->ep_cb; 2527 endpoint->cred_dist.svc_id = conn_req->svc_id; 2528 endpoint->cred_dist.htc_ep = endpoint; 2529 endpoint->cred_dist.endpoint = assigned_ep; 2530 endpoint->cred_dist.cred_sz = target->tgt_cred_sz; 2531 2532 switch (endpoint->svc_id) { 2533 case WMI_DATA_BK_SVC: 2534 endpoint->tx_drop_packet_threshold = MAX_DEF_COOKIE_NUM / 3; 2535 break; 2536 default: 2537 endpoint->tx_drop_packet_threshold = MAX_HI_COOKIE_NUM; 2538 break; 2539 } 2540 2541 if (conn_req->max_rxmsg_sz) { 2542 /* 2543 * Override cred_per_msg calculation, this optimizes 2544 * the credit-low indications since the host will actually 2545 * issue smaller messages in the Send path. 2546 */ 2547 if (conn_req->max_rxmsg_sz > max_msg_sz) { 2548 status = -ENOMEM; 2549 goto fail_tx; 2550 } 2551 endpoint->cred_dist.cred_per_msg = 2552 conn_req->max_rxmsg_sz / target->tgt_cred_sz; 2553 } else 2554 endpoint->cred_dist.cred_per_msg = 2555 max_msg_sz / target->tgt_cred_sz; 2556 2557 if (!endpoint->cred_dist.cred_per_msg) 2558 endpoint->cred_dist.cred_per_msg = 1; 2559 2560 /* save local connection flags */ 2561 endpoint->conn_flags = conn_req->flags; 2562 2563 fail_tx: 2564 if (tx_pkt) 2565 htc_reclaim_txctrl_buf(target, tx_pkt); 2566 2567 if (rx_pkt) { 2568 htc_rxpkt_reset(rx_pkt); 2569 reclaim_rx_ctrl_buf(target, rx_pkt); 2570 } 2571 2572 return status; 2573 } 2574 2575 static void reset_ep_state(struct htc_target *target) 2576 { 2577 struct htc_endpoint *endpoint; 2578 int i; 2579 2580 for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) { 2581 endpoint = &target->endpoint[i]; 2582 memset(&endpoint->cred_dist, 0, sizeof(endpoint->cred_dist)); 2583 endpoint->svc_id = 0; 2584 endpoint->len_max = 0; 2585 endpoint->max_txq_depth = 0; 2586 memset(&endpoint->ep_st, 0, 2587 sizeof(endpoint->ep_st)); 2588 INIT_LIST_HEAD(&endpoint->rx_bufq); 2589 INIT_LIST_HEAD(&endpoint->txq); 2590 endpoint->target = target; 2591 } 2592 2593 /* reset distribution list */ 2594 /* FIXME: free existing entries */ 2595 INIT_LIST_HEAD(&target->cred_dist_list); 2596 } 2597 2598 static int ath6kl_htc_mbox_get_rxbuf_num(struct htc_target *target, 2599 enum htc_endpoint_id endpoint) 2600 { 2601 int num; 2602 2603 spin_lock_bh(&target->rx_lock); 2604 num = get_queue_depth(&(target->endpoint[endpoint].rx_bufq)); 2605 spin_unlock_bh(&target->rx_lock); 2606 return num; 2607 } 2608 2609 static void htc_setup_msg_bndl(struct htc_target *target) 2610 { 2611 /* limit what HTC can handle */ 2612 target->msg_per_bndl_max = min(HTC_HOST_MAX_MSG_PER_BUNDLE, 2613 target->msg_per_bndl_max); 2614 2615 if (ath6kl_hif_enable_scatter(target->dev->ar)) { 2616 target->msg_per_bndl_max = 0; 2617 return; 2618 } 2619 2620 /* limit bundle what the device layer can handle */ 2621 target->msg_per_bndl_max = min(target->max_scat_entries, 2622 target->msg_per_bndl_max); 2623 2624 ath6kl_dbg(ATH6KL_DBG_BOOT, 2625 "htc bundling allowed msg_per_bndl_max %d\n", 2626 target->msg_per_bndl_max); 2627 2628 /* Max rx bundle size is limited by the max tx bundle size */ 2629 target->max_rx_bndl_sz = target->max_xfer_szper_scatreq; 2630 /* Max tx bundle size if limited by the extended mbox address range */ 2631 target->max_tx_bndl_sz = min(HIF_MBOX0_EXT_WIDTH, 2632 target->max_xfer_szper_scatreq); 2633 2634 ath6kl_dbg(ATH6KL_DBG_BOOT, "htc max_rx_bndl_sz %d max_tx_bndl_sz %d\n", 2635 target->max_rx_bndl_sz, target->max_tx_bndl_sz); 2636 2637 if (target->max_tx_bndl_sz) 2638 /* tx_bndl_mask is enabled per AC, each has 1 bit */ 2639 target->tx_bndl_mask = (1 << WMM_NUM_AC) - 1; 2640 2641 if (target->max_rx_bndl_sz) 2642 target->rx_bndl_enable = true; 2643 2644 if ((target->tgt_cred_sz % target->block_sz) != 0) { 2645 ath6kl_warn("credit size: %d is not block aligned! Disabling send bundling\n", 2646 target->tgt_cred_sz); 2647 2648 /* 2649 * Disallow send bundling since the credit size is 2650 * not aligned to a block size the I/O block 2651 * padding will spill into the next credit buffer 2652 * which is fatal. 2653 */ 2654 target->tx_bndl_mask = 0; 2655 } 2656 } 2657 2658 static int ath6kl_htc_mbox_wait_target(struct htc_target *target) 2659 { 2660 struct htc_packet *packet = NULL; 2661 struct htc_ready_ext_msg *rdy_msg; 2662 struct htc_service_connect_req connect; 2663 struct htc_service_connect_resp resp; 2664 int status; 2665 2666 /* we should be getting 1 control message that the target is ready */ 2667 packet = htc_wait_for_ctrl_msg(target); 2668 2669 if (!packet) 2670 return -ENOMEM; 2671 2672 /* we controlled the buffer creation so it's properly aligned */ 2673 rdy_msg = (struct htc_ready_ext_msg *)packet->buf; 2674 2675 if ((le16_to_cpu(rdy_msg->ver2_0_info.msg_id) != HTC_MSG_READY_ID) || 2676 (packet->act_len < sizeof(struct htc_ready_msg))) { 2677 status = -ENOMEM; 2678 goto fail_wait_target; 2679 } 2680 2681 if (!rdy_msg->ver2_0_info.cred_cnt || !rdy_msg->ver2_0_info.cred_sz) { 2682 status = -ENOMEM; 2683 goto fail_wait_target; 2684 } 2685 2686 target->tgt_creds = le16_to_cpu(rdy_msg->ver2_0_info.cred_cnt); 2687 target->tgt_cred_sz = le16_to_cpu(rdy_msg->ver2_0_info.cred_sz); 2688 2689 ath6kl_dbg(ATH6KL_DBG_BOOT, 2690 "htc target ready credits %d size %d\n", 2691 target->tgt_creds, target->tgt_cred_sz); 2692 2693 /* check if this is an extended ready message */ 2694 if (packet->act_len >= sizeof(struct htc_ready_ext_msg)) { 2695 /* this is an extended message */ 2696 target->htc_tgt_ver = rdy_msg->htc_ver; 2697 target->msg_per_bndl_max = rdy_msg->msg_per_htc_bndl; 2698 } else { 2699 /* legacy */ 2700 target->htc_tgt_ver = HTC_VERSION_2P0; 2701 target->msg_per_bndl_max = 0; 2702 } 2703 2704 ath6kl_dbg(ATH6KL_DBG_BOOT, "htc using protocol %s (%d)\n", 2705 (target->htc_tgt_ver == HTC_VERSION_2P0) ? "2.0" : ">= 2.1", 2706 target->htc_tgt_ver); 2707 2708 if (target->msg_per_bndl_max > 0) 2709 htc_setup_msg_bndl(target); 2710 2711 /* setup our pseudo HTC control endpoint connection */ 2712 memset(&connect, 0, sizeof(connect)); 2713 memset(&resp, 0, sizeof(resp)); 2714 connect.ep_cb.rx = htc_ctrl_rx; 2715 connect.ep_cb.rx_refill = NULL; 2716 connect.ep_cb.tx_full = NULL; 2717 connect.max_txq_depth = NUM_CONTROL_BUFFERS; 2718 connect.svc_id = HTC_CTRL_RSVD_SVC; 2719 2720 /* connect fake service */ 2721 status = ath6kl_htc_mbox_conn_service((void *)target, &connect, &resp); 2722 2723 if (status) 2724 /* 2725 * FIXME: this call doesn't make sense, the caller should 2726 * call ath6kl_htc_mbox_cleanup() when it wants remove htc 2727 */ 2728 ath6kl_hif_cleanup_scatter(target->dev->ar); 2729 2730 fail_wait_target: 2731 if (packet) { 2732 htc_rxpkt_reset(packet); 2733 reclaim_rx_ctrl_buf(target, packet); 2734 } 2735 2736 return status; 2737 } 2738 2739 /* 2740 * Start HTC, enable interrupts and let the target know 2741 * host has finished setup. 2742 */ 2743 static int ath6kl_htc_mbox_start(struct htc_target *target) 2744 { 2745 struct htc_packet *packet; 2746 int status; 2747 2748 memset(&target->dev->irq_proc_reg, 0, 2749 sizeof(target->dev->irq_proc_reg)); 2750 2751 /* Disable interrupts at the chip level */ 2752 ath6kl_hif_disable_intrs(target->dev); 2753 2754 target->htc_flags = 0; 2755 target->rx_st_flags = 0; 2756 2757 /* Push control receive buffers into htc control endpoint */ 2758 while ((packet = htc_get_control_buf(target, false)) != NULL) { 2759 status = htc_add_rxbuf(target, packet); 2760 if (status) 2761 return status; 2762 } 2763 2764 /* NOTE: the first entry in the distribution list is ENDPOINT_0 */ 2765 ath6kl_credit_init(target->credit_info, &target->cred_dist_list, 2766 target->tgt_creds); 2767 2768 dump_cred_dist_stats(target); 2769 2770 /* Indicate to the target of the setup completion */ 2771 status = htc_setup_tx_complete(target); 2772 2773 if (status) 2774 return status; 2775 2776 /* unmask interrupts */ 2777 status = ath6kl_hif_unmask_intrs(target->dev); 2778 2779 if (status) 2780 ath6kl_htc_mbox_stop(target); 2781 2782 return status; 2783 } 2784 2785 static int ath6kl_htc_reset(struct htc_target *target) 2786 { 2787 u32 block_size, ctrl_bufsz; 2788 struct htc_packet *packet; 2789 int i; 2790 2791 reset_ep_state(target); 2792 2793 block_size = target->dev->ar->mbox_info.block_size; 2794 2795 ctrl_bufsz = (block_size > HTC_MAX_CTRL_MSG_LEN) ? 2796 (block_size + HTC_HDR_LENGTH) : 2797 (HTC_MAX_CTRL_MSG_LEN + HTC_HDR_LENGTH); 2798 2799 for (i = 0; i < NUM_CONTROL_BUFFERS; i++) { 2800 packet = kzalloc(sizeof(*packet), GFP_KERNEL); 2801 if (!packet) 2802 return -ENOMEM; 2803 2804 packet->buf_start = kzalloc(ctrl_bufsz, GFP_KERNEL); 2805 if (!packet->buf_start) { 2806 kfree(packet); 2807 return -ENOMEM; 2808 } 2809 2810 packet->buf_len = ctrl_bufsz; 2811 if (i < NUM_CONTROL_RX_BUFFERS) { 2812 packet->act_len = 0; 2813 packet->buf = packet->buf_start; 2814 packet->endpoint = ENDPOINT_0; 2815 list_add_tail(&packet->list, &target->free_ctrl_rxbuf); 2816 } else { 2817 list_add_tail(&packet->list, &target->free_ctrl_txbuf); 2818 } 2819 } 2820 2821 return 0; 2822 } 2823 2824 /* htc_stop: stop interrupt reception, and flush all queued buffers */ 2825 static void ath6kl_htc_mbox_stop(struct htc_target *target) 2826 { 2827 spin_lock_bh(&target->htc_lock); 2828 target->htc_flags |= HTC_OP_STATE_STOPPING; 2829 spin_unlock_bh(&target->htc_lock); 2830 2831 /* 2832 * Masking interrupts is a synchronous operation, when this 2833 * function returns all pending HIF I/O has completed, we can 2834 * safely flush the queues. 2835 */ 2836 ath6kl_hif_mask_intrs(target->dev); 2837 2838 ath6kl_htc_flush_txep_all(target); 2839 2840 ath6kl_htc_mbox_flush_rx_buf(target); 2841 2842 ath6kl_htc_reset(target); 2843 } 2844 2845 static void *ath6kl_htc_mbox_create(struct ath6kl *ar) 2846 { 2847 struct htc_target *target = NULL; 2848 int status = 0; 2849 2850 target = kzalloc(sizeof(*target), GFP_KERNEL); 2851 if (!target) { 2852 ath6kl_err("unable to allocate memory\n"); 2853 return NULL; 2854 } 2855 2856 target->dev = kzalloc(sizeof(*target->dev), GFP_KERNEL); 2857 if (!target->dev) { 2858 ath6kl_err("unable to allocate memory\n"); 2859 status = -ENOMEM; 2860 goto err_htc_cleanup; 2861 } 2862 2863 spin_lock_init(&target->htc_lock); 2864 spin_lock_init(&target->rx_lock); 2865 spin_lock_init(&target->tx_lock); 2866 2867 INIT_LIST_HEAD(&target->free_ctrl_txbuf); 2868 INIT_LIST_HEAD(&target->free_ctrl_rxbuf); 2869 INIT_LIST_HEAD(&target->cred_dist_list); 2870 2871 target->dev->ar = ar; 2872 target->dev->htc_cnxt = target; 2873 target->ep_waiting = ENDPOINT_MAX; 2874 2875 status = ath6kl_hif_setup(target->dev); 2876 if (status) 2877 goto err_htc_cleanup; 2878 2879 status = ath6kl_htc_reset(target); 2880 if (status) 2881 goto err_htc_cleanup; 2882 2883 return target; 2884 2885 err_htc_cleanup: 2886 ath6kl_htc_mbox_cleanup(target); 2887 2888 return NULL; 2889 } 2890 2891 /* cleanup the HTC instance */ 2892 static void ath6kl_htc_mbox_cleanup(struct htc_target *target) 2893 { 2894 struct htc_packet *packet, *tmp_packet; 2895 2896 ath6kl_hif_cleanup_scatter(target->dev->ar); 2897 2898 list_for_each_entry_safe(packet, tmp_packet, 2899 &target->free_ctrl_txbuf, list) { 2900 list_del(&packet->list); 2901 kfree(packet->buf_start); 2902 kfree(packet); 2903 } 2904 2905 list_for_each_entry_safe(packet, tmp_packet, 2906 &target->free_ctrl_rxbuf, list) { 2907 list_del(&packet->list); 2908 kfree(packet->buf_start); 2909 kfree(packet); 2910 } 2911 2912 kfree(target->dev); 2913 kfree(target); 2914 } 2915 2916 static const struct ath6kl_htc_ops ath6kl_htc_mbox_ops = { 2917 .create = ath6kl_htc_mbox_create, 2918 .wait_target = ath6kl_htc_mbox_wait_target, 2919 .start = ath6kl_htc_mbox_start, 2920 .conn_service = ath6kl_htc_mbox_conn_service, 2921 .tx = ath6kl_htc_mbox_tx, 2922 .stop = ath6kl_htc_mbox_stop, 2923 .cleanup = ath6kl_htc_mbox_cleanup, 2924 .flush_txep = ath6kl_htc_mbox_flush_txep, 2925 .flush_rx_buf = ath6kl_htc_mbox_flush_rx_buf, 2926 .activity_changed = ath6kl_htc_mbox_activity_changed, 2927 .get_rxbuf_num = ath6kl_htc_mbox_get_rxbuf_num, 2928 .add_rxbuf_multiple = ath6kl_htc_mbox_add_rxbuf_multiple, 2929 .credit_setup = ath6kl_htc_mbox_credit_setup, 2930 }; 2931 2932 void ath6kl_htc_mbox_attach(struct ath6kl *ar) 2933 { 2934 ar->htc_ops = &ath6kl_htc_mbox_ops; 2935 } 2936