drivers/net/wireless/iwlwifi/pcie/tx.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved.
   4  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
   5  *
   6  * Portions of this file are derived from the ipw3945 project, as well
   7  * as portions of the ieee80211 subsystem header files.
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of version 2 of the GNU General Public License as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but WITHOUT
  14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  16  * more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along with
  19  * this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  21  *
  22  * The full GNU General Public License is included in this distribution in the
  23  * file called LICENSE.
  24  *
  25  * Contact Information:
  26  *  Intel Linux Wireless <ilw@linux.intel.com>
  27  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  28  *
  29  *****************************************************************************/
  30 #include <linux/etherdevice.h>
  31 #include <linux/slab.h>
  32 #include <linux/sched.h>
  33
  34 #include "iwl-debug.h"
  35 #include "iwl-csr.h"
  36 #include "iwl-prph.h"
  37 #include "iwl-io.h"
  38 #include "iwl-scd.h"
  39 #include "iwl-op-mode.h"
  40 #include "internal.h"
  41 /* FIXME: need to abstract out TX command (once we know what it looks like) */
  42 #include "dvm/commands.h"
  43
  44 #define IWL_TX_CRC_SIZE 4
  45 #define IWL_TX_DELIMITER_SIZE 4
  46
  47 /*************** DMA-QUEUE-GENERAL-FUNCTIONS  *****
  48  * DMA services
  49  *
  50  * Theory of operation
  51  *
  52  * A Tx or Rx queue resides in host DRAM, and is comprised of a circular buffer
  53  * of buffer descriptors, each of which points to one or more data buffers for
  54  * the device to read from or fill.  Driver and device exchange status of each
  55  * queue via "read" and "write" pointers.  Driver keeps minimum of 2 empty
  56  * entries in each circular buffer, to protect against confusing empty and full
  57  * queue states.
  58  *
  59  * The device reads or writes the data in the queues via the device's several
  60  * DMA/FIFO channels.  Each queue is mapped to a single DMA channel.
  61  *
  62  * For Tx queue, there are low mark and high mark limits. If, after queuing
  63  * the packet for Tx, free space become < low mark, Tx queue stopped. When
  64  * reclaiming packets (on 'tx done IRQ), if free space become > high mark,
  65  * Tx queue resumed.
  66  *
  67  ***************************************************/
  68 static int iwl_queue_space(const struct iwl_queue *q)
  69 {
  70         unsigned int max;
  71         unsigned int used;
  72
  73         /*
  74          * To avoid ambiguity between empty and completely full queues, there
  75          * should always be less than TFD_QUEUE_SIZE_MAX elements in the queue.
  76          * If q->n_window is smaller than TFD_QUEUE_SIZE_MAX, there is no need
  77          * to reserve any queue entries for this purpose.
  78          */
  79         if (q->n_window < TFD_QUEUE_SIZE_MAX)
  80                 max = q->n_window;
  81         else
  82                 max = TFD_QUEUE_SIZE_MAX - 1;
  83
  84         /*
  85          * TFD_QUEUE_SIZE_MAX is a power of 2, so the following is equivalent to
  86          * modulo by TFD_QUEUE_SIZE_MAX and is well defined.
  87          */
  88         used = (q->write_ptr - q->read_ptr) & (TFD_QUEUE_SIZE_MAX - 1);
  89
  90         if (WARN_ON(used > max))
  91                 return 0;
  92
  93         return max - used;
  94 }
  95
  96 /*
  97  * iwl_queue_init - Initialize queue's high/low-water and read/write indexes
  98  */
  99 static int iwl_queue_init(struct iwl_queue *q, int slots_num, u32 id)
 100 {
 101         q->n_window = slots_num;
 102         q->id = id;
 103
 104         /* slots_num must be power-of-two size, otherwise
 105          * get_cmd_index is broken. */
 106         if (WARN_ON(!is_power_of_2(slots_num)))
 107                 return -EINVAL;
 108
 109         q->low_mark = q->n_window / 4;
 110         if (q->low_mark < 4)
 111                 q->low_mark = 4;
 112
 113         q->high_mark = q->n_window / 8;
 114         if (q->high_mark < 2)
 115                 q->high_mark = 2;
 116
 117         q->write_ptr = 0;
 118         q->read_ptr = 0;
 119
 120         return 0;
 121 }
 122
 123 static int iwl_pcie_alloc_dma_ptr(struct iwl_trans *trans,
 124                                   struct iwl_dma_ptr *ptr, size_t size)
 125 {
 126         if (WARN_ON(ptr->addr))
 127                 return -EINVAL;
 128
 129         ptr->addr = dma_alloc_coherent(trans->dev, size,
 130                                        &ptr->dma, GFP_KERNEL);
 131         if (!ptr->addr)
 132                 return -ENOMEM;
 133         ptr->size = size;
 134         return 0;
 135 }
 136
 137 static void iwl_pcie_free_dma_ptr(struct iwl_trans *trans,
 138                                   struct iwl_dma_ptr *ptr)
 139 {
 140         if (unlikely(!ptr->addr))
 141                 return;
 142
 143         dma_free_coherent(trans->dev, ptr->size, ptr->addr, ptr->dma);
 144         memset(ptr, 0, sizeof(*ptr));
 145 }
 146
 147 static void iwl_pcie_txq_stuck_timer(unsigned long data)
 148 {
 149         struct iwl_txq *txq = (void *)data;
 150         struct iwl_queue *q = &txq->q;
 151         struct iwl_trans_pcie *trans_pcie = txq->trans_pcie;
 152         struct iwl_trans *trans = iwl_trans_pcie_get_trans(trans_pcie);
 153         u32 scd_sram_addr = trans_pcie->scd_base_addr +
 154                                 SCD_TX_STTS_QUEUE_OFFSET(txq->q.id);
 155         u8 buf[16];
 156         int i;
 157
 158         spin_lock(&txq->lock);
 159         /* check if triggered erroneously */
 160         if (txq->q.read_ptr == txq->q.write_ptr) {
 161                 spin_unlock(&txq->lock);
 162                 return;
 163         }
 164         spin_unlock(&txq->lock);
 165
 166         IWL_ERR(trans, "Queue %d stuck for %u ms.\n", txq->q.id,
 167                 jiffies_to_msecs(trans_pcie->wd_timeout));
 168         IWL_ERR(trans, "Current SW read_ptr %d write_ptr %d\n",
 169                 txq->q.read_ptr, txq->q.write_ptr);
 170
 171         iwl_trans_read_mem_bytes(trans, scd_sram_addr, buf, sizeof(buf));
 172
 173         iwl_print_hex_error(trans, buf, sizeof(buf));
 174
 175         for (i = 0; i < FH_TCSR_CHNL_NUM; i++)
 176                 IWL_ERR(trans, "FH TRBs(%d) = 0x%08x\n", i,
 177                         iwl_read_direct32(trans, FH_TX_TRB_REG(i)));
 178
 179         for (i = 0; i < trans->cfg->base_params->num_of_queues; i++) {
 180                 u32 status = iwl_read_prph(trans, SCD_QUEUE_STATUS_BITS(i));
 181                 u8 fifo = (status >> SCD_QUEUE_STTS_REG_POS_TXF) & 0x7;
 182                 bool active = !!(status & BIT(SCD_QUEUE_STTS_REG_POS_ACTIVE));
 183                 u32 tbl_dw =
 184                         iwl_trans_read_mem32(trans,
 185                                              trans_pcie->scd_base_addr +
 186                                              SCD_TRANS_TBL_OFFSET_QUEUE(i));
 187
 188                 if (i & 0x1)
 189                         tbl_dw = (tbl_dw & 0xFFFF0000) >> 16;
 190                 else
 191                         tbl_dw = tbl_dw & 0x0000FFFF;
 192
 193                 IWL_ERR(trans,
 194                         "Q %d is %sactive and mapped to fifo %d ra_tid 0x%04x [%d,%d]\n",
 195                         i, active ? "" : "in", fifo, tbl_dw,
 196                         iwl_read_prph(trans, SCD_QUEUE_RDPTR(i)) &
 197                                 (TFD_QUEUE_SIZE_MAX - 1),
 198                         iwl_read_prph(trans, SCD_QUEUE_WRPTR(i)));
 199         }
 200
 201         for (i = q->read_ptr; i != q->write_ptr;
 202              i = iwl_queue_inc_wrap(i))
 203                 IWL_ERR(trans, "scratch %d = 0x%08x\n", i,
 204                         le32_to_cpu(txq->scratchbufs[i].scratch));
 205
 206         iwl_force_nmi(trans);
 207 }
 208
 209 /*
 210  * iwl_pcie_txq_update_byte_cnt_tbl - Set up entry in Tx byte-count array
 211  */
 212 static void iwl_pcie_txq_update_byte_cnt_tbl(struct iwl_trans *trans,
 213                                              struct iwl_txq *txq, u16 byte_cnt)
 214 {
 215         struct iwlagn_scd_bc_tbl *scd_bc_tbl;
 216         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 217         int write_ptr = txq->q.write_ptr;
 218         int txq_id = txq->q.id;
 219         u8 sec_ctl = 0;
 220         u8 sta_id = 0;
 221         u16 len = byte_cnt + IWL_TX_CRC_SIZE + IWL_TX_DELIMITER_SIZE;
 222         __le16 bc_ent;
 223         struct iwl_tx_cmd *tx_cmd =
 224                 (void *) txq->entries[txq->q.write_ptr].cmd->payload;
 225
 226         scd_bc_tbl = trans_pcie->scd_bc_tbls.addr;
 227
 228         WARN_ON(len > 0xFFF || write_ptr >= TFD_QUEUE_SIZE_MAX);
 229
 230         sta_id = tx_cmd->sta_id;
 231         sec_ctl = tx_cmd->sec_ctl;
 232
 233         switch (sec_ctl & TX_CMD_SEC_MSK) {
 234         case TX_CMD_SEC_CCM:
 235                 len += IEEE80211_CCMP_MIC_LEN;
 236                 break;
 237         case TX_CMD_SEC_TKIP:
 238                 len += IEEE80211_TKIP_ICV_LEN;
 239                 break;
 240         case TX_CMD_SEC_WEP:
 241                 len += IEEE80211_WEP_IV_LEN + IEEE80211_WEP_ICV_LEN;
 242                 break;
 243         }
 244
 245         if (trans_pcie->bc_table_dword)
 246                 len = DIV_ROUND_UP(len, 4);
 247
 248         bc_ent = cpu_to_le16(len | (sta_id << 12));
 249
 250         scd_bc_tbl[txq_id].tfd_offset[write_ptr] = bc_ent;
 251
 252         if (write_ptr < TFD_QUEUE_SIZE_BC_DUP)
 253                 scd_bc_tbl[txq_id].
 254                         tfd_offset[TFD_QUEUE_SIZE_MAX + write_ptr] = bc_ent;
 255 }
 256
 257 static void iwl_pcie_txq_inval_byte_cnt_tbl(struct iwl_trans *trans,
 258                                             struct iwl_txq *txq)
 259 {
 260         struct iwl_trans_pcie *trans_pcie =
 261                 IWL_TRANS_GET_PCIE_TRANS(trans);
 262         struct iwlagn_scd_bc_tbl *scd_bc_tbl = trans_pcie->scd_bc_tbls.addr;
 263         int txq_id = txq->q.id;
 264         int read_ptr = txq->q.read_ptr;
 265         u8 sta_id = 0;
 266         __le16 bc_ent;
 267         struct iwl_tx_cmd *tx_cmd =
 268                 (void *)txq->entries[txq->q.read_ptr].cmd->payload;
 269
 270         WARN_ON(read_ptr >= TFD_QUEUE_SIZE_MAX);
 271
 272         if (txq_id != trans_pcie->cmd_queue)
 273                 sta_id = tx_cmd->sta_id;
 274
 275         bc_ent = cpu_to_le16(1 | (sta_id << 12));
 276         scd_bc_tbl[txq_id].tfd_offset[read_ptr] = bc_ent;
 277
 278         if (read_ptr < TFD_QUEUE_SIZE_BC_DUP)
 279                 scd_bc_tbl[txq_id].
 280                         tfd_offset[TFD_QUEUE_SIZE_MAX + read_ptr] = bc_ent;
 281 }
 282
 283 /*
 284  * iwl_pcie_txq_inc_wr_ptr - Send new write index to hardware
 285  */
 286 static void iwl_pcie_txq_inc_wr_ptr(struct iwl_trans *trans,
 287                                     struct iwl_txq *txq)
 288 {
 289         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 290         u32 reg = 0;
 291         int txq_id = txq->q.id;
 292
 293         lockdep_assert_held(&txq->lock);
 294
 295         /*
 296          * explicitly wake up the NIC if:
 297          * 1. shadow registers aren't enabled
 298          * 2. NIC is woken up for CMD regardless of shadow outside this function
 299          * 3. there is a chance that the NIC is asleep
 300          */
 301         if (!trans->cfg->base_params->shadow_reg_enable &&
 302             txq_id != trans_pcie->cmd_queue &&
 303             test_bit(STATUS_TPOWER_PMI, &trans->status)) {
 304                 /*
 305                  * wake up nic if it's powered down ...
 306                  * uCode will wake up, and interrupt us again, so next
 307                  * time we'll skip this part.
 308                  */
 309                 reg = iwl_read32(trans, CSR_UCODE_DRV_GP1);
 310
 311                 if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
 312                         IWL_DEBUG_INFO(trans, "Tx queue %d requesting wakeup, GP1 = 0x%x\n",
 313                                        txq_id, reg);
 314                         iwl_set_bit(trans, CSR_GP_CNTRL,
 315                                     CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 316                         txq->need_update = true;
 317                         return;
 318                 }
 319         }
 320
 321         /*
 322          * if not in power-save mode, uCode will never sleep when we're
 323          * trying to tx (during RFKILL, we're not trying to tx).
 324          */
 325         IWL_DEBUG_TX(trans, "Q:%d WR: 0x%x\n", txq_id, txq->q.write_ptr);
 326         iwl_write32(trans, HBUS_TARG_WRPTR, txq->q.write_ptr | (txq_id << 8));
 327 }
 328
 329 void iwl_pcie_txq_check_wrptrs(struct iwl_trans *trans)
 330 {
 331         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 332         int i;
 333
 334         for (i = 0; i < trans->cfg->base_params->num_of_queues; i++) {
 335                 struct iwl_txq *txq = &trans_pcie->txq[i];
 336
 337                 spin_lock_bh(&txq->lock);
 338                 if (trans_pcie->txq[i].need_update) {
 339                         iwl_pcie_txq_inc_wr_ptr(trans, txq);
 340                         trans_pcie->txq[i].need_update = false;
 341                 }
 342                 spin_unlock_bh(&txq->lock);
 343         }
 344 }
 345
 346 static inline dma_addr_t iwl_pcie_tfd_tb_get_addr(struct iwl_tfd *tfd, u8 idx)
 347 {
 348         struct iwl_tfd_tb *tb = &tfd->tbs[idx];
 349
 350         dma_addr_t addr = get_unaligned_le32(&tb->lo);
 351         if (sizeof(dma_addr_t) > sizeof(u32))
 352                 addr |=
 353                 ((dma_addr_t)(le16_to_cpu(tb->hi_n_len) & 0xF) << 16) << 16;
 354
 355         return addr;
 356 }
 357
 358 static inline void iwl_pcie_tfd_set_tb(struct iwl_tfd *tfd, u8 idx,
 359                                        dma_addr_t addr, u16 len)
 360 {
 361         struct iwl_tfd_tb *tb = &tfd->tbs[idx];
 362         u16 hi_n_len = len << 4;
 363
 364         put_unaligned_le32(addr, &tb->lo);
 365         if (sizeof(dma_addr_t) > sizeof(u32))
 366                 hi_n_len |= ((addr >> 16) >> 16) & 0xF;
 367
 368         tb->hi_n_len = cpu_to_le16(hi_n_len);
 369
 370         tfd->num_tbs = idx + 1;
 371 }
 372
 373 static inline u8 iwl_pcie_tfd_get_num_tbs(struct iwl_tfd *tfd)
 374 {
 375         return tfd->num_tbs & 0x1f;
 376 }
 377
 378 static void iwl_pcie_tfd_unmap(struct iwl_trans *trans,
 379                                struct iwl_cmd_meta *meta,
 380                                struct iwl_tfd *tfd)
 381 {
 382         int i;
 383         int num_tbs;
 384
 385         /* Sanity check on number of chunks */
 386         num_tbs = iwl_pcie_tfd_get_num_tbs(tfd);
 387
 388         if (num_tbs >= IWL_NUM_OF_TBS) {
 389                 IWL_ERR(trans, "Too many chunks: %i\n", num_tbs);
 390                 /* @todo issue fatal error, it is quite serious situation */
 391                 return;
 392         }
 393
 394         /* first TB is never freed - it's the scratchbuf data */
 395
 396         for (i = 1; i < num_tbs; i++)
 397                 dma_unmap_single(trans->dev, iwl_pcie_tfd_tb_get_addr(tfd, i),
 398                                  iwl_pcie_tfd_tb_get_len(tfd, i),
 399                                  DMA_TO_DEVICE);
 400
 401         tfd->num_tbs = 0;
 402 }
 403
 404 /*
 405  * iwl_pcie_txq_free_tfd - Free all chunks referenced by TFD [txq->q.read_ptr]
 406  * @trans - transport private data
 407  * @txq - tx queue
 408  * @dma_dir - the direction of the DMA mapping
 409  *
 410  * Does NOT advance any TFD circular buffer read/write indexes
 411  * Does NOT free the TFD itself (which is within circular buffer)
 412  */
 413 static void iwl_pcie_txq_free_tfd(struct iwl_trans *trans, struct iwl_txq *txq)
 414 {
 415         struct iwl_tfd *tfd_tmp = txq->tfds;
 416
 417         /* rd_ptr is bounded by TFD_QUEUE_SIZE_MAX and
 418          * idx is bounded by n_window
 419          */
 420         int rd_ptr = txq->q.read_ptr;
 421         int idx = get_cmd_index(&txq->q, rd_ptr);
 422
 423         lockdep_assert_held(&txq->lock);
 424
 425         /* We have only q->n_window txq->entries, but we use
 426          * TFD_QUEUE_SIZE_MAX tfds
 427          */
 428         iwl_pcie_tfd_unmap(trans, &txq->entries[idx].meta, &tfd_tmp[rd_ptr]);
 429
 430         /* free SKB */
 431         if (txq->entries) {
 432                 struct sk_buff *skb;
 433
 434                 skb = txq->entries[idx].skb;
 435
 436                 /* Can be called from irqs-disabled context
 437                  * If skb is not NULL, it means that the whole queue is being
 438                  * freed and that the queue is not empty - free the skb
 439                  */
 440                 if (skb) {
 441                         iwl_op_mode_free_skb(trans->op_mode, skb);
 442                         txq->entries[idx].skb = NULL;
 443                 }
 444         }
 445 }
 446
 447 static int iwl_pcie_txq_build_tfd(struct iwl_trans *trans, struct iwl_txq *txq,
 448                                   dma_addr_t addr, u16 len, bool reset)
 449 {
 450         struct iwl_queue *q;
 451         struct iwl_tfd *tfd, *tfd_tmp;
 452         u32 num_tbs;
 453
 454         q = &txq->q;
 455         tfd_tmp = txq->tfds;
 456         tfd = &tfd_tmp[q->write_ptr];
 457
 458         if (reset)
 459                 memset(tfd, 0, sizeof(*tfd));
 460
 461         num_tbs = iwl_pcie_tfd_get_num_tbs(tfd);
 462
 463         /* Each TFD can point to a maximum 20 Tx buffers */
 464         if (num_tbs >= IWL_NUM_OF_TBS) {
 465                 IWL_ERR(trans, "Error can not send more than %d chunks\n",
 466                         IWL_NUM_OF_TBS);
 467                 return -EINVAL;
 468         }
 469
 470         if (WARN(addr & ~IWL_TX_DMA_MASK,
 471                  "Unaligned address = %llx\n", (unsigned long long)addr))
 472                 return -EINVAL;
 473
 474         iwl_pcie_tfd_set_tb(tfd, num_tbs, addr, len);
 475
 476         return 0;
 477 }
 478
 479 static int iwl_pcie_txq_alloc(struct iwl_trans *trans,
 480                                struct iwl_txq *txq, int slots_num,
 481                                u32 txq_id)
 482 {
 483         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 484         size_t tfd_sz = sizeof(struct iwl_tfd) * TFD_QUEUE_SIZE_MAX;
 485         size_t scratchbuf_sz;
 486         int i;
 487
 488         if (WARN_ON(txq->entries || txq->tfds))
 489                 return -EINVAL;
 490
 491         setup_timer(&txq->stuck_timer, iwl_pcie_txq_stuck_timer,
 492                     (unsigned long)txq);
 493         txq->trans_pcie = trans_pcie;
 494
 495         txq->q.n_window = slots_num;
 496
 497         txq->entries = kcalloc(slots_num,
 498                                sizeof(struct iwl_pcie_txq_entry),
 499                                GFP_KERNEL);
 500
 501         if (!txq->entries)
 502                 goto error;
 503
 504         if (txq_id == trans_pcie->cmd_queue)
 505                 for (i = 0; i < slots_num; i++) {
 506                         txq->entries[i].cmd =
 507                                 kmalloc(sizeof(struct iwl_device_cmd),
 508                                         GFP_KERNEL);
 509                         if (!txq->entries[i].cmd)
 510                                 goto error;
 511                 }
 512
 513         /* Circular buffer of transmit frame descriptors (TFDs),
 514          * shared with device */
 515         txq->tfds = dma_alloc_coherent(trans->dev, tfd_sz,
 516                                        &txq->q.dma_addr, GFP_KERNEL);
 517         if (!txq->tfds)
 518                 goto error;
 519
 520         BUILD_BUG_ON(IWL_HCMD_SCRATCHBUF_SIZE != sizeof(*txq->scratchbufs));
 521         BUILD_BUG_ON(offsetof(struct iwl_pcie_txq_scratch_buf, scratch) !=
 522                         sizeof(struct iwl_cmd_header) +
 523                         offsetof(struct iwl_tx_cmd, scratch));
 524
 525         scratchbuf_sz = sizeof(*txq->scratchbufs) * slots_num;
 526
 527         txq->scratchbufs = dma_alloc_coherent(trans->dev, scratchbuf_sz,
 528                                               &txq->scratchbufs_dma,
 529                                               GFP_KERNEL);
 530         if (!txq->scratchbufs)
 531                 goto err_free_tfds;
 532
 533         txq->q.id = txq_id;
 534
 535         return 0;
 536 err_free_tfds:
 537         dma_free_coherent(trans->dev, tfd_sz, txq->tfds, txq->q.dma_addr);
 538 error:
 539         if (txq->entries && txq_id == trans_pcie->cmd_queue)
 540                 for (i = 0; i < slots_num; i++)
 541                         kfree(txq->entries[i].cmd);
 542         kfree(txq->entries);
 543         txq->entries = NULL;
 544
 545         return -ENOMEM;
 546
 547 }
 548
 549 static int iwl_pcie_txq_init(struct iwl_trans *trans, struct iwl_txq *txq,
 550                               int slots_num, u32 txq_id)
 551 {
 552         int ret;
 553
 554         txq->need_update = false;
 555
 556         /* TFD_QUEUE_SIZE_MAX must be power-of-two size, otherwise
 557          * iwl_queue_inc_wrap and iwl_queue_dec_wrap are broken. */
 558         BUILD_BUG_ON(TFD_QUEUE_SIZE_MAX & (TFD_QUEUE_SIZE_MAX - 1));
 559
 560         /* Initialize queue's high/low-water marks, and head/tail indexes */
 561         ret = iwl_queue_init(&txq->q, slots_num, txq_id);
 562         if (ret)
 563                 return ret;
 564
 565         spin_lock_init(&txq->lock);
 566
 567         /*
 568          * Tell nic where to find circular buffer of Tx Frame Descriptors for
 569          * given Tx queue, and enable the DMA channel used for that queue.
 570          * Circular buffer (TFD queue in DRAM) physical base address */
 571         iwl_write_direct32(trans, FH_MEM_CBBC_QUEUE(txq_id),
 572                            txq->q.dma_addr >> 8);
 573
 574         return 0;
 575 }
 576
 577 /*
 578  * iwl_pcie_txq_unmap -  Unmap any remaining DMA mappings and free skb's
 579  */
 580 static void iwl_pcie_txq_unmap(struct iwl_trans *trans, int txq_id)
 581 {
 582         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 583         struct iwl_txq *txq = &trans_pcie->txq[txq_id];
 584         struct iwl_queue *q = &txq->q;
 585
 586         spin_lock_bh(&txq->lock);
 587         while (q->write_ptr != q->read_ptr) {
 588                 IWL_DEBUG_TX_REPLY(trans, "Q %d Free %d\n",
 589                                    txq_id, q->read_ptr);
 590                 iwl_pcie_txq_free_tfd(trans, txq);
 591                 q->read_ptr = iwl_queue_inc_wrap(q->read_ptr);
 592         }
 593         txq->active = false;
 594         spin_unlock_bh(&txq->lock);
 595
 596         /* just in case - this queue may have been stopped */
 597         iwl_wake_queue(trans, txq);
 598 }
 599
 600 /*
 601  * iwl_pcie_txq_free - Deallocate DMA queue.
 602  * @txq: Transmit queue to deallocate.
 603  *
 604  * Empty queue by removing and destroying all BD's.
 605  * Free all buffers.
 606  * 0-fill, but do not free "txq" descriptor structure.
 607  */
 608 static void iwl_pcie_txq_free(struct iwl_trans *trans, int txq_id)
 609 {
 610         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 611         struct iwl_txq *txq = &trans_pcie->txq[txq_id];
 612         struct device *dev = trans->dev;
 613         int i;
 614
 615         if (WARN_ON(!txq))
 616                 return;
 617
 618         iwl_pcie_txq_unmap(trans, txq_id);
 619
 620         /* De-alloc array of command/tx buffers */
 621         if (txq_id == trans_pcie->cmd_queue)
 622                 for (i = 0; i < txq->q.n_window; i++) {
 623                         kzfree(txq->entries[i].cmd);
 624                         kzfree(txq->entries[i].free_buf);
 625                 }
 626
 627         /* De-alloc circular buffer of TFDs */
 628         if (txq->tfds) {
 629                 dma_free_coherent(dev,
 630                                   sizeof(struct iwl_tfd) * TFD_QUEUE_SIZE_MAX,
 631                                   txq->tfds, txq->q.dma_addr);
 632                 txq->q.dma_addr = 0;
 633                 txq->tfds = NULL;
 634
 635                 dma_free_coherent(dev,
 636                                   sizeof(*txq->scratchbufs) * txq->q.n_window,
 637                                   txq->scratchbufs, txq->scratchbufs_dma);
 638         }
 639
 640         kfree(txq->entries);
 641         txq->entries = NULL;
 642
 643         del_timer_sync(&txq->stuck_timer);
 644
 645         /* 0-fill queue descriptor structure */
 646         memset(txq, 0, sizeof(*txq));
 647 }
 648
 649 void iwl_pcie_tx_start(struct iwl_trans *trans, u32 scd_base_addr)
 650 {
 651         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 652         int nq = trans->cfg->base_params->num_of_queues;
 653         int chan;
 654         u32 reg_val;
 655         int clear_dwords = (SCD_TRANS_TBL_OFFSET_QUEUE(nq) -
 656                                 SCD_CONTEXT_MEM_LOWER_BOUND) / sizeof(u32);
 657
 658         /* make sure all queue are not stopped/used */
 659         memset(trans_pcie->queue_stopped, 0, sizeof(trans_pcie->queue_stopped));
 660         memset(trans_pcie->queue_used, 0, sizeof(trans_pcie->queue_used));
 661
 662         trans_pcie->scd_base_addr =
 663                 iwl_read_prph(trans, SCD_SRAM_BASE_ADDR);
 664
 665         WARN_ON(scd_base_addr != 0 &&
 666                 scd_base_addr != trans_pcie->scd_base_addr);
 667
 668         /* reset context data, TX status and translation data */
 669         iwl_trans_write_mem(trans, trans_pcie->scd_base_addr +
 670                                    SCD_CONTEXT_MEM_LOWER_BOUND,
 671                             NULL, clear_dwords);
 672
 673         iwl_write_prph(trans, SCD_DRAM_BASE_ADDR,
 674                        trans_pcie->scd_bc_tbls.dma >> 10);
 675
 676         /* The chain extension of the SCD doesn't work well. This feature is
 677          * enabled by default by the HW, so we need to disable it manually.
 678          */
 679         if (trans->cfg->base_params->scd_chain_ext_wa)
 680                 iwl_write_prph(trans, SCD_CHAINEXT_EN, 0);
 681
 682         iwl_trans_ac_txq_enable(trans, trans_pcie->cmd_queue,
 683                                 trans_pcie->cmd_fifo);
 684
 685         /* Activate all Tx DMA/FIFO channels */
 686         iwl_scd_activate_fifos(trans);
 687
 688         /* Enable DMA channel */
 689         for (chan = 0; chan < FH_TCSR_CHNL_NUM; chan++)
 690                 iwl_write_direct32(trans, FH_TCSR_CHNL_TX_CONFIG_REG(chan),
 691                                    FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_ENABLE |
 692                                    FH_TCSR_TX_CONFIG_REG_VAL_DMA_CREDIT_ENABLE);
 693
 694         /* Update FH chicken bits */
 695         reg_val = iwl_read_direct32(trans, FH_TX_CHICKEN_BITS_REG);
 696         iwl_write_direct32(trans, FH_TX_CHICKEN_BITS_REG,
 697                            reg_val | FH_TX_CHICKEN_BITS_SCD_AUTO_RETRY_EN);
 698
 699         /* Enable L1-Active */
 700         if (trans->cfg->device_family != IWL_DEVICE_FAMILY_8000)
 701                 iwl_clear_bits_prph(trans, APMG_PCIDEV_STT_REG,
 702                                     APMG_PCIDEV_STT_VAL_L1_ACT_DIS);
 703 }
 704
 705 void iwl_trans_pcie_tx_reset(struct iwl_trans *trans)
 706 {
 707         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 708         int txq_id;
 709
 710         for (txq_id = 0; txq_id < trans->cfg->base_params->num_of_queues;
 711              txq_id++) {
 712                 struct iwl_txq *txq = &trans_pcie->txq[txq_id];
 713
 714                 iwl_write_direct32(trans, FH_MEM_CBBC_QUEUE(txq_id),
 715                                    txq->q.dma_addr >> 8);
 716                 iwl_pcie_txq_unmap(trans, txq_id);
 717                 txq->q.read_ptr = 0;
 718                 txq->q.write_ptr = 0;
 719         }
 720
 721         /* Tell NIC where to find the "keep warm" buffer */
 722         iwl_write_direct32(trans, FH_KW_MEM_ADDR_REG,
 723                            trans_pcie->kw.dma >> 4);
 724
 725         iwl_pcie_tx_start(trans, trans_pcie->scd_base_addr);
 726 }
 727
 728 /*
 729  * iwl_pcie_tx_stop - Stop all Tx DMA channels
 730  */
 731 int iwl_pcie_tx_stop(struct iwl_trans *trans)
 732 {
 733         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 734         int ch, txq_id, ret;
 735
 736         /* Turn off all Tx DMA fifos */
 737         spin_lock(&trans_pcie->irq_lock);
 738
 739         iwl_scd_deactivate_fifos(trans);
 740
 741         /* Stop each Tx DMA channel, and wait for it to be idle */
 742         for (ch = 0; ch < FH_TCSR_CHNL_NUM; ch++) {
 743                 iwl_write_direct32(trans,
 744                                    FH_TCSR_CHNL_TX_CONFIG_REG(ch), 0x0);
 745                 ret = iwl_poll_direct_bit(trans, FH_TSSR_TX_STATUS_REG,
 746                         FH_TSSR_TX_STATUS_REG_MSK_CHNL_IDLE(ch), 1000);
 747                 if (ret < 0)
 748                         IWL_ERR(trans,
 749                                 "Failing on timeout while stopping DMA channel %d [0x%08x]\n",
 750                                 ch,
 751                                 iwl_read_direct32(trans,
 752                                                   FH_TSSR_TX_STATUS_REG));
 753         }
 754         spin_unlock(&trans_pcie->irq_lock);
 755
 756         /*
 757          * This function can be called before the op_mode disabled the
 758          * queues. This happens when we have an rfkill interrupt.
 759          * Since we stop Tx altogether - mark the queues as stopped.
 760          */
 761         memset(trans_pcie->queue_stopped, 0, sizeof(trans_pcie->queue_stopped));
 762         memset(trans_pcie->queue_used, 0, sizeof(trans_pcie->queue_used));
 763
 764         /* This can happen: start_hw, stop_device */
 765         if (!trans_pcie->txq)
 766                 return 0;
 767
 768         /* Unmap DMA from host system and free skb's */
 769         for (txq_id = 0; txq_id < trans->cfg->base_params->num_of_queues;
 770              txq_id++)
 771                 iwl_pcie_txq_unmap(trans, txq_id);
 772
 773         return 0;
 774 }
 775
 776 /*
 777  * iwl_trans_tx_free - Free TXQ Context
 778  *
 779  * Destroy all TX DMA queues and structures
 780  */
 781 void iwl_pcie_tx_free(struct iwl_trans *trans)
 782 {
 783         int txq_id;
 784         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 785
 786         /* Tx queues */
 787         if (trans_pcie->txq) {
 788                 for (txq_id = 0;
 789                      txq_id < trans->cfg->base_params->num_of_queues; txq_id++)
 790                         iwl_pcie_txq_free(trans, txq_id);
 791         }
 792
 793         kfree(trans_pcie->txq);
 794         trans_pcie->txq = NULL;
 795
 796         iwl_pcie_free_dma_ptr(trans, &trans_pcie->kw);
 797
 798         iwl_pcie_free_dma_ptr(trans, &trans_pcie->scd_bc_tbls);
 799 }
 800
 801 /*
 802  * iwl_pcie_tx_alloc - allocate TX context
 803  * Allocate all Tx DMA structures and initialize them
 804  */
 805 static int iwl_pcie_tx_alloc(struct iwl_trans *trans)
 806 {
 807         int ret;
 808         int txq_id, slots_num;
 809         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 810
 811         u16 scd_bc_tbls_size = trans->cfg->base_params->num_of_queues *
 812                         sizeof(struct iwlagn_scd_bc_tbl);
 813
 814         /*It is not allowed to alloc twice, so warn when this happens.
 815          * We cannot rely on the previous allocation, so free and fail */
 816         if (WARN_ON(trans_pcie->txq)) {
 817                 ret = -EINVAL;
 818                 goto error;
 819         }
 820
 821         ret = iwl_pcie_alloc_dma_ptr(trans, &trans_pcie->scd_bc_tbls,
 822                                    scd_bc_tbls_size);
 823         if (ret) {
 824                 IWL_ERR(trans, "Scheduler BC Table allocation failed\n");
 825                 goto error;
 826         }
 827
 828         /* Alloc keep-warm buffer */
 829         ret = iwl_pcie_alloc_dma_ptr(trans, &trans_pcie->kw, IWL_KW_SIZE);
 830         if (ret) {
 831                 IWL_ERR(trans, "Keep Warm allocation failed\n");
 832                 goto error;
 833         }
 834
 835         trans_pcie->txq = kcalloc(trans->cfg->base_params->num_of_queues,
 836                                   sizeof(struct iwl_txq), GFP_KERNEL);
 837         if (!trans_pcie->txq) {
 838                 IWL_ERR(trans, "Not enough memory for txq\n");
 839                 ret = -ENOMEM;
 840                 goto error;
 841         }
 842
 843         /* Alloc and init all Tx queues, including the command queue (#4/#9) */
 844         for (txq_id = 0; txq_id < trans->cfg->base_params->num_of_queues;
 845              txq_id++) {
 846                 slots_num = (txq_id == trans_pcie->cmd_queue) ?
 847                                         TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS;
 848                 ret = iwl_pcie_txq_alloc(trans, &trans_pcie->txq[txq_id],
 849                                           slots_num, txq_id);
 850                 if (ret) {
 851                         IWL_ERR(trans, "Tx %d queue alloc failed\n", txq_id);
 852                         goto error;
 853                 }
 854         }
 855
 856         return 0;
 857
 858 error:
 859         iwl_pcie_tx_free(trans);
 860
 861         return ret;
 862 }
 863 int iwl_pcie_tx_init(struct iwl_trans *trans)
 864 {
 865         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 866         int ret;
 867         int txq_id, slots_num;
 868         bool alloc = false;
 869
 870         if (!trans_pcie->txq) {
 871                 ret = iwl_pcie_tx_alloc(trans);
 872                 if (ret)
 873                         goto error;
 874                 alloc = true;
 875         }
 876
 877         spin_lock(&trans_pcie->irq_lock);
 878
 879         /* Turn off all Tx DMA fifos */
 880         iwl_scd_deactivate_fifos(trans);
 881
 882         /* Tell NIC where to find the "keep warm" buffer */
 883         iwl_write_direct32(trans, FH_KW_MEM_ADDR_REG,
 884                            trans_pcie->kw.dma >> 4);
 885
 886         spin_unlock(&trans_pcie->irq_lock);
 887
 888         /* Alloc and init all Tx queues, including the command queue (#4/#9) */
 889         for (txq_id = 0; txq_id < trans->cfg->base_params->num_of_queues;
 890              txq_id++) {
 891                 slots_num = (txq_id == trans_pcie->cmd_queue) ?
 892                                         TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS;
 893                 ret = iwl_pcie_txq_init(trans, &trans_pcie->txq[txq_id],
 894                                          slots_num, txq_id);
 895                 if (ret) {
 896                         IWL_ERR(trans, "Tx %d queue init failed\n", txq_id);
 897                         goto error;
 898                 }
 899         }
 900
 901         return 0;
 902 error:
 903         /*Upon error, free only if we allocated something */
 904         if (alloc)
 905                 iwl_pcie_tx_free(trans);
 906         return ret;
 907 }
 908
 909 static inline void iwl_pcie_txq_progress(struct iwl_trans_pcie *trans_pcie,
 910                                            struct iwl_txq *txq)
 911 {
 912         if (!trans_pcie->wd_timeout)
 913                 return;
 914
 915         /*
 916          * if empty delete timer, otherwise move timer forward
 917          * since we're making progress on this queue
 918          */
 919         if (txq->q.read_ptr == txq->q.write_ptr)
 920                 del_timer(&txq->stuck_timer);
 921         else
 922                 mod_timer(&txq->stuck_timer, jiffies + trans_pcie->wd_timeout);
 923 }
 924
 925 /* Frees buffers until index _not_ inclusive */
 926 void iwl_trans_pcie_reclaim(struct iwl_trans *trans, int txq_id, int ssn,
 927                             struct sk_buff_head *skbs)
 928 {
 929         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 930         struct iwl_txq *txq = &trans_pcie->txq[txq_id];
 931         int tfd_num = ssn & (TFD_QUEUE_SIZE_MAX - 1);
 932         struct iwl_queue *q = &txq->q;
 933         int last_to_free;
 934
 935         /* This function is not meant to release cmd queue*/
 936         if (WARN_ON(txq_id == trans_pcie->cmd_queue))
 937                 return;
 938
 939         spin_lock_bh(&txq->lock);
 940
 941         if (!txq->active) {
 942                 IWL_DEBUG_TX_QUEUES(trans, "Q %d inactive - ignoring idx %d\n",
 943                                     txq_id, ssn);
 944                 goto out;
 945         }
 946
 947         if (txq->q.read_ptr == tfd_num)
 948                 goto out;
 949
 950         IWL_DEBUG_TX_REPLY(trans, "[Q %d] %d -> %d (%d)\n",
 951                            txq_id, txq->q.read_ptr, tfd_num, ssn);
 952
 953         /*Since we free until index _not_ inclusive, the one before index is
 954          * the last we will free. This one must be used */
 955         last_to_free = iwl_queue_dec_wrap(tfd_num);
 956
 957         if (!iwl_queue_used(q, last_to_free)) {
 958                 IWL_ERR(trans,
 959                         "%s: Read index for DMA queue txq id (%d), last_to_free %d is out of range [0-%d] %d %d.\n",
 960                         __func__, txq_id, last_to_free, TFD_QUEUE_SIZE_MAX,
 961                         q->write_ptr, q->read_ptr);
 962                 goto out;
 963         }
 964
 965         if (WARN_ON(!skb_queue_empty(skbs)))
 966                 goto out;
 967
 968         for (;
 969              q->read_ptr != tfd_num;
 970              q->read_ptr = iwl_queue_inc_wrap(q->read_ptr)) {
 971
 972                 if (WARN_ON_ONCE(txq->entries[txq->q.read_ptr].skb == NULL))
 973                         continue;
 974
 975                 __skb_queue_tail(skbs, txq->entries[txq->q.read_ptr].skb);
 976
 977                 txq->entries[txq->q.read_ptr].skb = NULL;
 978
 979                 iwl_pcie_txq_inval_byte_cnt_tbl(trans, txq);
 980
 981                 iwl_pcie_txq_free_tfd(trans, txq);
 982         }
 983
 984         iwl_pcie_txq_progress(trans_pcie, txq);
 985
 986         if (iwl_queue_space(&txq->q) > txq->q.low_mark)
 987                 iwl_wake_queue(trans, txq);
 988
 989         if (q->read_ptr == q->write_ptr) {
 990                 IWL_DEBUG_RPM(trans, "Q %d - last tx reclaimed\n", q->id);
 991                 iwl_trans_pcie_unref(trans);
 992         }
 993
 994 out:
 995         spin_unlock_bh(&txq->lock);
 996 }
 997
 998 static int iwl_pcie_set_cmd_in_flight(struct iwl_trans *trans,
 999                                       const struct iwl_host_cmd *cmd)
1000 {
1001         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1002         int ret;
1003
1004         lockdep_assert_held(&trans_pcie->reg_lock);
1005
1006         if (!(cmd->flags & CMD_SEND_IN_IDLE) &&
1007             !trans_pcie->ref_cmd_in_flight) {
1008                 trans_pcie->ref_cmd_in_flight = true;
1009                 IWL_DEBUG_RPM(trans, "set ref_cmd_in_flight - ref\n");
1010                 iwl_trans_pcie_ref(trans);
1011         }
1012
1013         if (trans_pcie->cmd_in_flight)
1014                 return 0;
1015
1016         trans_pcie->cmd_in_flight = true;
1017
1018         /*
1019          * wake up the NIC to make sure that the firmware will see the host
1020          * command - we will let the NIC sleep once all the host commands
1021          * returned. This needs to be done only on NICs that have
1022          * apmg_wake_up_wa set.
1023          */
1024         if (trans->cfg->base_params->apmg_wake_up_wa) {
1025                 __iwl_trans_pcie_set_bit(trans, CSR_GP_CNTRL,
1026                                          CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
1027                 if (trans->cfg->device_family == IWL_DEVICE_FAMILY_8000)
1028                         udelay(2);
1029
1030                 ret = iwl_poll_bit(trans, CSR_GP_CNTRL,
1031                                    CSR_GP_CNTRL_REG_VAL_MAC_ACCESS_EN,
1032                                    (CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY |
1033                                     CSR_GP_CNTRL_REG_FLAG_GOING_TO_SLEEP),
1034                                    15000);
1035                 if (ret < 0) {
1036                         __iwl_trans_pcie_clear_bit(trans, CSR_GP_CNTRL,
1037                                         CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
1038                         trans_pcie->cmd_in_flight = false;
1039                         IWL_ERR(trans, "Failed to wake NIC for hcmd\n");
1040                         return -EIO;
1041                 }
1042         }
1043
1044         return 0;
1045 }
1046
1047 static int iwl_pcie_clear_cmd_in_flight(struct iwl_trans *trans)
1048 {
1049         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1050
1051         lockdep_assert_held(&trans_pcie->reg_lock);
1052
1053         if (trans_pcie->ref_cmd_in_flight) {
1054                 trans_pcie->ref_cmd_in_flight = false;
1055                 IWL_DEBUG_RPM(trans, "clear ref_cmd_in_flight - unref\n");
1056                 iwl_trans_pcie_unref(trans);
1057         }
1058
1059         if (WARN_ON(!trans_pcie->cmd_in_flight))
1060                 return 0;
1061
1062         trans_pcie->cmd_in_flight = false;
1063
1064         if (trans->cfg->base_params->apmg_wake_up_wa)
1065                 __iwl_trans_pcie_clear_bit(trans, CSR_GP_CNTRL,
1066                                         CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
1067
1068         return 0;
1069 }
1070
1071 /*
1072  * iwl_pcie_cmdq_reclaim - Reclaim TX command queue entries already Tx'd
1073  *
1074  * When FW advances 'R' index, all entries between old and new 'R' index
1075  * need to be reclaimed. As result, some free space forms.  If there is
1076  * enough free space (> low mark), wake the stack that feeds us.
1077  */
1078 static void iwl_pcie_cmdq_reclaim(struct iwl_trans *trans, int txq_id, int idx)
1079 {
1080         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1081         struct iwl_txq *txq = &trans_pcie->txq[txq_id];
1082         struct iwl_queue *q = &txq->q;
1083         unsigned long flags;
1084         int nfreed = 0;
1085
1086         lockdep_assert_held(&txq->lock);
1087
1088         if ((idx >= TFD_QUEUE_SIZE_MAX) || (!iwl_queue_used(q, idx))) {
1089                 IWL_ERR(trans,
1090                         "%s: Read index for DMA queue txq id (%d), index %d is out of range [0-%d] %d %d.\n",
1091                         __func__, txq_id, idx, TFD_QUEUE_SIZE_MAX,
1092                         q->write_ptr, q->read_ptr);
1093                 return;
1094         }
1095
1096         for (idx = iwl_queue_inc_wrap(idx); q->read_ptr != idx;
1097              q->read_ptr = iwl_queue_inc_wrap(q->read_ptr)) {
1098
1099                 if (nfreed++ > 0) {
1100                         IWL_ERR(trans, "HCMD skipped: index (%d) %d %d\n",
1101                                 idx, q->write_ptr, q->read_ptr);
1102                         iwl_force_nmi(trans);
1103                 }
1104         }
1105
1106         if (q->read_ptr == q->write_ptr) {
1107                 spin_lock_irqsave(&trans_pcie->reg_lock, flags);
1108                 iwl_pcie_clear_cmd_in_flight(trans);
1109                 spin_unlock_irqrestore(&trans_pcie->reg_lock, flags);
1110         }
1111
1112         iwl_pcie_txq_progress(trans_pcie, txq);
1113 }
1114
1115 static int iwl_pcie_txq_set_ratid_map(struct iwl_trans *trans, u16 ra_tid,
1116                                  u16 txq_id)
1117 {
1118         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1119         u32 tbl_dw_addr;
1120         u32 tbl_dw;
1121         u16 scd_q2ratid;
1122
1123         scd_q2ratid = ra_tid & SCD_QUEUE_RA_TID_MAP_RATID_MSK;
1124
1125         tbl_dw_addr = trans_pcie->scd_base_addr +
1126                         SCD_TRANS_TBL_OFFSET_QUEUE(txq_id);
1127
1128         tbl_dw = iwl_trans_read_mem32(trans, tbl_dw_addr);
1129
1130         if (txq_id & 0x1)
1131                 tbl_dw = (scd_q2ratid << 16) | (tbl_dw & 0x0000FFFF);
1132         else
1133                 tbl_dw = scd_q2ratid | (tbl_dw & 0xFFFF0000);
1134
1135         iwl_trans_write_mem32(trans, tbl_dw_addr, tbl_dw);
1136
1137         return 0;
1138 }
1139
1140 /* Receiver address (actually, Rx station's index into station table),
1141  * combined with Traffic ID (QOS priority), in format used by Tx Scheduler */
1142 #define BUILD_RAxTID(sta_id, tid)       (((sta_id) << 4) + (tid))
1143
1144 void iwl_trans_pcie_txq_enable(struct iwl_trans *trans, int txq_id, u16 ssn,
1145                                const struct iwl_trans_txq_scd_cfg *cfg)
1146 {
1147         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1148         int fifo = -1;
1149
1150         if (test_and_set_bit(txq_id, trans_pcie->queue_used))
1151                 WARN_ONCE(1, "queue %d already used - expect issues", txq_id);
1152
1153         if (cfg) {
1154                 fifo = cfg->fifo;
1155
1156                 /* Disable the scheduler prior configuring the cmd queue */
1157                 if (txq_id == trans_pcie->cmd_queue &&
1158                     trans_pcie->scd_set_active)
1159                         iwl_scd_enable_set_active(trans, 0);
1160
1161                 /* Stop this Tx queue before configuring it */
1162                 iwl_scd_txq_set_inactive(trans, txq_id);
1163
1164                 /* Set this queue as a chain-building queue unless it is CMD */
1165                 if (txq_id != trans_pcie->cmd_queue)
1166                         iwl_scd_txq_set_chain(trans, txq_id);
1167
1168                 if (cfg->aggregate) {
1169                         u16 ra_tid = BUILD_RAxTID(cfg->sta_id, cfg->tid);
1170
1171                         /* Map receiver-address / traffic-ID to this queue */
1172                         iwl_pcie_txq_set_ratid_map(trans, ra_tid, txq_id);
1173
1174                         /* enable aggregations for the queue */
1175                         iwl_scd_txq_enable_agg(trans, txq_id);
1176                         trans_pcie->txq[txq_id].ampdu = true;
1177                 } else {
1178                         /*
1179                          * disable aggregations for the queue, this will also
1180                          * make the ra_tid mapping configuration irrelevant
1181                          * since it is now a non-AGG queue.
1182                          */
1183                         iwl_scd_txq_disable_agg(trans, txq_id);
1184
1185                         ssn = trans_pcie->txq[txq_id].q.read_ptr;
1186                 }
1187         }
1188
1189         /* Place first TFD at index corresponding to start sequence number.
1190          * Assumes that ssn_idx is valid (!= 0xFFF) */
1191         trans_pcie->txq[txq_id].q.read_ptr = (ssn & 0xff);
1192         trans_pcie->txq[txq_id].q.write_ptr = (ssn & 0xff);
1193
1194         if (cfg) {
1195                 u8 frame_limit = cfg->frame_limit;
1196
1197                 iwl_write_direct32(trans, HBUS_TARG_WRPTR,
1198                                    (ssn & 0xff) | (txq_id << 8));
1199                 iwl_write_prph(trans, SCD_QUEUE_RDPTR(txq_id), ssn);
1200
1201                 /* Set up Tx window size and frame limit for this queue */
1202                 iwl_trans_write_mem32(trans, trans_pcie->scd_base_addr +
1203                                 SCD_CONTEXT_QUEUE_OFFSET(txq_id), 0);
1204                 iwl_trans_write_mem32(trans,
1205                         trans_pcie->scd_base_addr +
1206                         SCD_CONTEXT_QUEUE_OFFSET(txq_id) + sizeof(u32),
1207                         ((frame_limit << SCD_QUEUE_CTX_REG2_WIN_SIZE_POS) &
1208                                         SCD_QUEUE_CTX_REG2_WIN_SIZE_MSK) |
1209                         ((frame_limit << SCD_QUEUE_CTX_REG2_FRAME_LIMIT_POS) &
1210                                         SCD_QUEUE_CTX_REG2_FRAME_LIMIT_MSK));
1211
1212                 /* Set up status area in SRAM, map to Tx DMA/FIFO, activate */
1213                 iwl_write_prph(trans, SCD_QUEUE_STATUS_BITS(txq_id),
1214                                (1 << SCD_QUEUE_STTS_REG_POS_ACTIVE) |
1215                                (cfg->fifo << SCD_QUEUE_STTS_REG_POS_TXF) |
1216                                (1 << SCD_QUEUE_STTS_REG_POS_WSL) |
1217                                SCD_QUEUE_STTS_REG_MSK);
1218
1219                 /* enable the scheduler for this queue (only) */
1220                 if (txq_id == trans_pcie->cmd_queue &&
1221                     trans_pcie->scd_set_active)
1222                         iwl_scd_enable_set_active(trans, BIT(txq_id));
1223         }
1224
1225         trans_pcie->txq[txq_id].active = true;
1226         IWL_DEBUG_TX_QUEUES(trans, "Activate queue %d on FIFO %d WrPtr: %d\n",
1227                             txq_id, fifo, ssn & 0xff);
1228 }
1229
1230 void iwl_trans_pcie_txq_disable(struct iwl_trans *trans, int txq_id,
1231                                 bool configure_scd)
1232 {
1233         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1234         u32 stts_addr = trans_pcie->scd_base_addr +
1235                         SCD_TX_STTS_QUEUE_OFFSET(txq_id);
1236         static const u32 zero_val[4] = {};
1237
1238         /*
1239          * Upon HW Rfkill - we stop the device, and then stop the queues
1240          * in the op_mode. Just for the sake of the simplicity of the op_mode,
1241          * allow the op_mode to call txq_disable after it already called
1242          * stop_device.
1243          */
1244         if (!test_and_clear_bit(txq_id, trans_pcie->queue_used)) {
1245                 WARN_ONCE(test_bit(STATUS_DEVICE_ENABLED, &trans->status),
1246                           "queue %d not used", txq_id);
1247                 return;
1248         }
1249
1250         if (configure_scd) {
1251                 iwl_scd_txq_set_inactive(trans, txq_id);
1252
1253                 iwl_trans_write_mem(trans, stts_addr, (void *)zero_val,
1254                                     ARRAY_SIZE(zero_val));
1255         }
1256
1257         iwl_pcie_txq_unmap(trans, txq_id);
1258         trans_pcie->txq[txq_id].ampdu = false;
1259
1260         IWL_DEBUG_TX_QUEUES(trans, "Deactivate queue %d\n", txq_id);
1261 }
1262
1263 /*************** HOST COMMAND QUEUE FUNCTIONS   *****/
1264
1265 /*
1266  * iwl_pcie_enqueue_hcmd - enqueue a uCode command
1267  * @priv: device private data point
1268  * @cmd: a pointer to the ucode command structure
1269  *
1270  * The function returns < 0 values to indicate the operation
1271  * failed. On success, it returns the index (>= 0) of command in the
1272  * command queue.
1273  */
1274 static int iwl_pcie_enqueue_hcmd(struct iwl_trans *trans,
1275                                  struct iwl_host_cmd *cmd)
1276 {
1277         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1278         struct iwl_txq *txq = &trans_pcie->txq[trans_pcie->cmd_queue];
1279         struct iwl_queue *q = &txq->q;
1280         struct iwl_device_cmd *out_cmd;
1281         struct iwl_cmd_meta *out_meta;
1282         unsigned long flags;
1283         void *dup_buf = NULL;
1284         dma_addr_t phys_addr;
1285         int idx;
1286         u16 copy_size, cmd_size, scratch_size;
1287         bool had_nocopy = false;
1288         int i, ret;
1289         u32 cmd_pos;
1290         const u8 *cmddata[IWL_MAX_CMD_TBS_PER_TFD];
1291         u16 cmdlen[IWL_MAX_CMD_TBS_PER_TFD];
1292
1293         copy_size = sizeof(out_cmd->hdr);
1294         cmd_size = sizeof(out_cmd->hdr);
1295
1296         /* need one for the header if the first is NOCOPY */
1297         BUILD_BUG_ON(IWL_MAX_CMD_TBS_PER_TFD > IWL_NUM_OF_TBS - 1);
1298
1299         for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
1300                 cmddata[i] = cmd->data[i];
1301                 cmdlen[i] = cmd->len[i];
1302
1303                 if (!cmd->len[i])
1304                         continue;
1305
1306                 /* need at least IWL_HCMD_SCRATCHBUF_SIZE copied */
1307                 if (copy_size < IWL_HCMD_SCRATCHBUF_SIZE) {
1308                         int copy = IWL_HCMD_SCRATCHBUF_SIZE - copy_size;
1309
1310                         if (copy > cmdlen[i])
1311                                 copy = cmdlen[i];
1312                         cmdlen[i] -= copy;
1313                         cmddata[i] += copy;
1314                         copy_size += copy;
1315                 }
1316
1317                 if (cmd->dataflags[i] & IWL_HCMD_DFL_NOCOPY) {
1318                         had_nocopy = true;
1319                         if (WARN_ON(cmd->dataflags[i] & IWL_HCMD_DFL_DUP)) {
1320                                 idx = -EINVAL;
1321                                 goto free_dup_buf;
1322                         }
1323                 } else if (cmd->dataflags[i] & IWL_HCMD_DFL_DUP) {
1324                         /*
1325                          * This is also a chunk that isn't copied
1326                          * to the static buffer so set had_nocopy.
1327                          */
1328                         had_nocopy = true;
1329
1330                         /* only allowed once */
1331                         if (WARN_ON(dup_buf)) {
1332                                 idx = -EINVAL;
1333                                 goto free_dup_buf;
1334                         }
1335
1336                         dup_buf = kmemdup(cmddata[i], cmdlen[i],
1337                                           GFP_ATOMIC);
1338                         if (!dup_buf)
1339                                 return -ENOMEM;
1340                 } else {
1341                         /* NOCOPY must not be followed by normal! */
1342                         if (WARN_ON(had_nocopy)) {
1343                                 idx = -EINVAL;
1344                                 goto free_dup_buf;
1345                         }
1346                         copy_size += cmdlen[i];
1347                 }
1348                 cmd_size += cmd->len[i];
1349         }
1350
1351         /*
1352          * If any of the command structures end up being larger than
1353          * the TFD_MAX_PAYLOAD_SIZE and they aren't dynamically
1354          * allocated into separate TFDs, then we will need to
1355          * increase the size of the buffers.
1356          */
1357         if (WARN(copy_size > TFD_MAX_PAYLOAD_SIZE,
1358                  "Command %s (%#x) is too large (%d bytes)\n",
1359                  get_cmd_string(trans_pcie, cmd->id), cmd->id, copy_size)) {
1360                 idx = -EINVAL;
1361                 goto free_dup_buf;
1362         }
1363
1364         spin_lock_bh(&txq->lock);
1365
1366         if (iwl_queue_space(q) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) {
1367                 spin_unlock_bh(&txq->lock);
1368
1369                 IWL_ERR(trans, "No space in command queue\n");
1370                 iwl_op_mode_cmd_queue_full(trans->op_mode);
1371                 idx = -ENOSPC;
1372                 goto free_dup_buf;
1373         }
1374
1375         idx = get_cmd_index(q, q->write_ptr);
1376         out_cmd = txq->entries[idx].cmd;
1377         out_meta = &txq->entries[idx].meta;
1378
1379         memset(out_meta, 0, sizeof(*out_meta)); /* re-initialize to NULL */
1380         if (cmd->flags & CMD_WANT_SKB)
1381                 out_meta->source = cmd;
1382
1383         /* set up the header */
1384
1385         out_cmd->hdr.cmd = cmd->id;
1386         out_cmd->hdr.flags = 0;
1387         out_cmd->hdr.sequence =
1388                 cpu_to_le16(QUEUE_TO_SEQ(trans_pcie->cmd_queue) |
1389                                          INDEX_TO_SEQ(q->write_ptr));
1390
1391         /* and copy the data that needs to be copied */
1392         cmd_pos = offsetof(struct iwl_device_cmd, payload);
1393         copy_size = sizeof(out_cmd->hdr);
1394         for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
1395                 int copy;
1396
1397                 if (!cmd->len[i])
1398                         continue;
1399
1400                 /* copy everything if not nocopy/dup */
1401                 if (!(cmd->dataflags[i] & (IWL_HCMD_DFL_NOCOPY |
1402                                            IWL_HCMD_DFL_DUP))) {
1403                         copy = cmd->len[i];
1404
1405                         memcpy((u8 *)out_cmd + cmd_pos, cmd->data[i], copy);
1406                         cmd_pos += copy;
1407                         copy_size += copy;
1408                         continue;
1409                 }
1410
1411                 /*
1412                  * Otherwise we need at least IWL_HCMD_SCRATCHBUF_SIZE copied
1413                  * in total (for the scratchbuf handling), but copy up to what
1414                  * we can fit into the payload for debug dump purposes.
1415                  */
1416                 copy = min_t(int, TFD_MAX_PAYLOAD_SIZE - cmd_pos, cmd->len[i]);
1417
1418                 memcpy((u8 *)out_cmd + cmd_pos, cmd->data[i], copy);
1419                 cmd_pos += copy;
1420
1421                 /* However, treat copy_size the proper way, we need it below */
1422                 if (copy_size < IWL_HCMD_SCRATCHBUF_SIZE) {
1423                         copy = IWL_HCMD_SCRATCHBUF_SIZE - copy_size;
1424
1425                         if (copy > cmd->len[i])
1426                                 copy = cmd->len[i];
1427                         copy_size += copy;
1428                 }
1429         }
1430
1431         IWL_DEBUG_HC(trans,
1432                      "Sending command %s (#%x), seq: 0x%04X, %d bytes at %d[%d]:%d\n",
1433                      get_cmd_string(trans_pcie, out_cmd->hdr.cmd),
1434                      out_cmd->hdr.cmd, le16_to_cpu(out_cmd->hdr.sequence),
1435                      cmd_size, q->write_ptr, idx, trans_pcie->cmd_queue);
1436
1437         /* start the TFD with the scratchbuf */
1438         scratch_size = min_t(int, copy_size, IWL_HCMD_SCRATCHBUF_SIZE);
1439         memcpy(&txq->scratchbufs[q->write_ptr], &out_cmd->hdr, scratch_size);
1440         iwl_pcie_txq_build_tfd(trans, txq,
1441                                iwl_pcie_get_scratchbuf_dma(txq, q->write_ptr),
1442                                scratch_size, true);
1443
1444         /* map first command fragment, if any remains */
1445         if (copy_size > scratch_size) {
1446                 phys_addr = dma_map_single(trans->dev,
1447                                            ((u8 *)&out_cmd->hdr) + scratch_size,
1448                                            copy_size - scratch_size,
1449                                            DMA_TO_DEVICE);
1450                 if (dma_mapping_error(trans->dev, phys_addr)) {
1451                         iwl_pcie_tfd_unmap(trans, out_meta,
1452                                            &txq->tfds[q->write_ptr]);
1453                         idx = -ENOMEM;
1454                         goto out;
1455                 }
1456
1457                 iwl_pcie_txq_build_tfd(trans, txq, phys_addr,
1458                                        copy_size - scratch_size, false);
1459         }
1460
1461         /* map the remaining (adjusted) nocopy/dup fragments */
1462         for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
1463                 const void *data = cmddata[i];
1464
1465                 if (!cmdlen[i])
1466                         continue;
1467                 if (!(cmd->dataflags[i] & (IWL_HCMD_DFL_NOCOPY |
1468                                            IWL_HCMD_DFL_DUP)))
1469                         continue;
1470                 if (cmd->dataflags[i] & IWL_HCMD_DFL_DUP)
1471                         data = dup_buf;
1472                 phys_addr = dma_map_single(trans->dev, (void *)data,
1473                                            cmdlen[i], DMA_TO_DEVICE);
1474                 if (dma_mapping_error(trans->dev, phys_addr)) {
1475                         iwl_pcie_tfd_unmap(trans, out_meta,
1476                                            &txq->tfds[q->write_ptr]);
1477                         idx = -ENOMEM;
1478                         goto out;
1479                 }
1480
1481                 iwl_pcie_txq_build_tfd(trans, txq, phys_addr, cmdlen[i], false);
1482         }
1483
1484         out_meta->flags = cmd->flags;
1485         if (WARN_ON_ONCE(txq->entries[idx].free_buf))
1486                 kzfree(txq->entries[idx].free_buf);
1487         txq->entries[idx].free_buf = dup_buf;
1488
1489         trace_iwlwifi_dev_hcmd(trans->dev, cmd, cmd_size, &out_cmd->hdr);
1490
1491         /* start timer if queue currently empty */
1492         if (q->read_ptr == q->write_ptr && trans_pcie->wd_timeout)
1493                 mod_timer(&txq->stuck_timer, jiffies + trans_pcie->wd_timeout);
1494
1495         spin_lock_irqsave(&trans_pcie->reg_lock, flags);
1496         ret = iwl_pcie_set_cmd_in_flight(trans, cmd);
1497         if (ret < 0) {
1498                 idx = ret;
1499                 spin_unlock_irqrestore(&trans_pcie->reg_lock, flags);
1500                 goto out;
1501         }
1502
1503         /* Increment and update queue's write index */
1504         q->write_ptr = iwl_queue_inc_wrap(q->write_ptr);
1505         iwl_pcie_txq_inc_wr_ptr(trans, txq);
1506
1507         spin_unlock_irqrestore(&trans_pcie->reg_lock, flags);
1508
1509  out:
1510         spin_unlock_bh(&txq->lock);
1511  free_dup_buf:
1512         if (idx < 0)
1513                 kfree(dup_buf);
1514         return idx;
1515 }
1516
1517 /*
1518  * iwl_pcie_hcmd_complete - Pull unused buffers off the queue and reclaim them
1519  * @rxb: Rx buffer to reclaim
1520  * @handler_status: return value of the handler of the command
1521  *      (put in setup_rx_handlers)
1522  *
1523  * If an Rx buffer has an async callback associated with it the callback
1524  * will be executed.  The attached skb (if present) will only be freed
1525  * if the callback returns 1
1526  */
1527 void iwl_pcie_hcmd_complete(struct iwl_trans *trans,
1528                             struct iwl_rx_cmd_buffer *rxb, int handler_status)
1529 {
1530         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1531         u16 sequence = le16_to_cpu(pkt->hdr.sequence);
1532         int txq_id = SEQ_TO_QUEUE(sequence);
1533         int index = SEQ_TO_INDEX(sequence);
1534         int cmd_index;
1535         struct iwl_device_cmd *cmd;
1536         struct iwl_cmd_meta *meta;
1537         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1538         struct iwl_txq *txq = &trans_pcie->txq[trans_pcie->cmd_queue];
1539
1540         /* If a Tx command is being handled and it isn't in the actual
1541          * command queue then there a command routing bug has been introduced
1542          * in the queue management code. */
1543         if (WARN(txq_id != trans_pcie->cmd_queue,
1544                  "wrong command queue %d (should be %d), sequence 0x%X readp=%d writep=%d\n",
1545                  txq_id, trans_pcie->cmd_queue, sequence,
1546                  trans_pcie->txq[trans_pcie->cmd_queue].q.read_ptr,
1547                  trans_pcie->txq[trans_pcie->cmd_queue].q.write_ptr)) {
1548                 iwl_print_hex_error(trans, pkt, 32);
1549                 return;
1550         }
1551
1552         spin_lock_bh(&txq->lock);
1553
1554         cmd_index = get_cmd_index(&txq->q, index);
1555         cmd = txq->entries[cmd_index].cmd;
1556         meta = &txq->entries[cmd_index].meta;
1557
1558         iwl_pcie_tfd_unmap(trans, meta, &txq->tfds[index]);
1559
1560         /* Input error checking is done when commands are added to queue. */
1561         if (meta->flags & CMD_WANT_SKB) {
1562                 struct page *p = rxb_steal_page(rxb);
1563
1564                 meta->source->resp_pkt = pkt;
1565                 meta->source->_rx_page_addr = (unsigned long)page_address(p);
1566                 meta->source->_rx_page_order = trans_pcie->rx_page_order;
1567                 meta->source->handler_status = handler_status;
1568         }
1569
1570         iwl_pcie_cmdq_reclaim(trans, txq_id, index);
1571
1572         if (!(meta->flags & CMD_ASYNC)) {
1573                 if (!test_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status)) {
1574                         IWL_WARN(trans,
1575                                  "HCMD_ACTIVE already clear for command %s\n",
1576                                  get_cmd_string(trans_pcie, cmd->hdr.cmd));
1577                 }
1578                 clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status);
1579                 IWL_DEBUG_INFO(trans, "Clearing HCMD_ACTIVE for command %s\n",
1580                                get_cmd_string(trans_pcie, cmd->hdr.cmd));
1581                 wake_up(&trans_pcie->wait_command_queue);
1582         }
1583
1584         meta->flags = 0;
1585
1586         spin_unlock_bh(&txq->lock);
1587 }
1588
1589 #define HOST_COMPLETE_TIMEOUT   (2 * HZ)
1590
1591 static int iwl_pcie_send_hcmd_async(struct iwl_trans *trans,
1592                                     struct iwl_host_cmd *cmd)
1593 {
1594         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1595         int ret;
1596
1597         /* An asynchronous command can not expect an SKB to be set. */
1598         if (WARN_ON(cmd->flags & CMD_WANT_SKB))
1599                 return -EINVAL;
1600
1601         ret = iwl_pcie_enqueue_hcmd(trans, cmd);
1602         if (ret < 0) {
1603                 IWL_ERR(trans,
1604                         "Error sending %s: enqueue_hcmd failed: %d\n",
1605                         get_cmd_string(trans_pcie, cmd->id), ret);
1606                 return ret;
1607         }
1608         return 0;
1609 }
1610
1611 static int iwl_pcie_send_hcmd_sync(struct iwl_trans *trans,
1612                                    struct iwl_host_cmd *cmd)
1613 {
1614         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1615         int cmd_idx;
1616         int ret;
1617
1618         IWL_DEBUG_INFO(trans, "Attempting to send sync command %s\n",
1619                        get_cmd_string(trans_pcie, cmd->id));
1620
1621         if (WARN(test_and_set_bit(STATUS_SYNC_HCMD_ACTIVE,
1622                                   &trans->status),
1623                  "Command %s: a command is already active!\n",
1624                  get_cmd_string(trans_pcie, cmd->id)))
1625                 return -EIO;
1626
1627         IWL_DEBUG_INFO(trans, "Setting HCMD_ACTIVE for command %s\n",
1628                        get_cmd_string(trans_pcie, cmd->id));
1629
1630         cmd_idx = iwl_pcie_enqueue_hcmd(trans, cmd);
1631         if (cmd_idx < 0) {
1632                 ret = cmd_idx;
1633                 clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status);
1634                 IWL_ERR(trans,
1635                         "Error sending %s: enqueue_hcmd failed: %d\n",
1636                         get_cmd_string(trans_pcie, cmd->id), ret);
1637                 return ret;
1638         }
1639
1640         ret = wait_event_timeout(trans_pcie->wait_command_queue,
1641                                  !test_bit(STATUS_SYNC_HCMD_ACTIVE,
1642                                            &trans->status),
1643                                  HOST_COMPLETE_TIMEOUT);
1644         if (!ret) {
1645                 struct iwl_txq *txq = &trans_pcie->txq[trans_pcie->cmd_queue];
1646                 struct iwl_queue *q = &txq->q;
1647
1648                 IWL_ERR(trans, "Error sending %s: time out after %dms.\n",
1649                         get_cmd_string(trans_pcie, cmd->id),
1650                         jiffies_to_msecs(HOST_COMPLETE_TIMEOUT));
1651
1652                 IWL_ERR(trans, "Current CMD queue read_ptr %d write_ptr %d\n",
1653                         q->read_ptr, q->write_ptr);
1654
1655                 clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status);
1656                 IWL_DEBUG_INFO(trans, "Clearing HCMD_ACTIVE for command %s\n",
1657                                get_cmd_string(trans_pcie, cmd->id));
1658                 ret = -ETIMEDOUT;
1659
1660                 iwl_force_nmi(trans);
1661                 iwl_trans_fw_error(trans);
1662
1663                 goto cancel;
1664         }
1665
1666         if (test_bit(STATUS_FW_ERROR, &trans->status)) {
1667                 IWL_ERR(trans, "FW error in SYNC CMD %s\n",
1668                         get_cmd_string(trans_pcie, cmd->id));
1669                 dump_stack();
1670                 ret = -EIO;
1671                 goto cancel;
1672         }
1673
1674         if (!(cmd->flags & CMD_SEND_IN_RFKILL) &&
1675             test_bit(STATUS_RFKILL, &trans->status)) {
1676                 IWL_DEBUG_RF_KILL(trans, "RFKILL in SYNC CMD... no rsp\n");
1677                 ret = -ERFKILL;
1678                 goto cancel;
1679         }
1680
1681         if ((cmd->flags & CMD_WANT_SKB) && !cmd->resp_pkt) {
1682                 IWL_ERR(trans, "Error: Response NULL in '%s'\n",
1683                         get_cmd_string(trans_pcie, cmd->id));
1684                 ret = -EIO;
1685                 goto cancel;
1686         }
1687
1688         return 0;
1689
1690 cancel:
1691         if (cmd->flags & CMD_WANT_SKB) {
1692                 /*
1693                  * Cancel the CMD_WANT_SKB flag for the cmd in the
1694                  * TX cmd queue. Otherwise in case the cmd comes
1695                  * in later, it will possibly set an invalid
1696                  * address (cmd->meta.source).
1697                  */
1698                 trans_pcie->txq[trans_pcie->cmd_queue].
1699                         entries[cmd_idx].meta.flags &= ~CMD_WANT_SKB;
1700         }
1701
1702         if (cmd->resp_pkt) {
1703                 iwl_free_resp(cmd);
1704                 cmd->resp_pkt = NULL;
1705         }
1706
1707         return ret;
1708 }
1709
1710 int iwl_trans_pcie_send_hcmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd)
1711 {
1712         if (!(cmd->flags & CMD_SEND_IN_RFKILL) &&
1713             test_bit(STATUS_RFKILL, &trans->status)) {
1714                 IWL_DEBUG_RF_KILL(trans, "Dropping CMD 0x%x: RF KILL\n",
1715                                   cmd->id);
1716                 return -ERFKILL;
1717         }
1718
1719         if (cmd->flags & CMD_ASYNC)
1720                 return iwl_pcie_send_hcmd_async(trans, cmd);
1721
1722         /* We still can fail on RFKILL that can be asserted while we wait */
1723         return iwl_pcie_send_hcmd_sync(trans, cmd);
1724 }
1725
1726 int iwl_trans_pcie_tx(struct iwl_trans *trans, struct sk_buff *skb,
1727                       struct iwl_device_cmd *dev_cmd, int txq_id)
1728 {
1729         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1730         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1731         struct iwl_tx_cmd *tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
1732         struct iwl_cmd_meta *out_meta;
1733         struct iwl_txq *txq;
1734         struct iwl_queue *q;
1735         dma_addr_t tb0_phys, tb1_phys, scratch_phys;
1736         void *tb1_addr;
1737         u16 len, tb1_len, tb2_len;
1738         bool wait_write_ptr;
1739         __le16 fc = hdr->frame_control;
1740         u8 hdr_len = ieee80211_hdrlen(fc);
1741         u16 wifi_seq;
1742
1743         txq = &trans_pcie->txq[txq_id];
1744         q = &txq->q;
1745
1746         if (WARN_ONCE(!test_bit(txq_id, trans_pcie->queue_used),
1747                       "TX on unused queue %d\n", txq_id))
1748                 return -EINVAL;
1749
1750         spin_lock(&txq->lock);
1751
1752         /* In AGG mode, the index in the ring must correspond to the WiFi
1753          * sequence number. This is a HW requirements to help the SCD to parse
1754          * the BA.
1755          * Check here that the packets are in the right place on the ring.
1756          */
1757         wifi_seq = IEEE80211_SEQ_TO_SN(le16_to_cpu(hdr->seq_ctrl));
1758         WARN_ONCE(txq->ampdu &&
1759                   (wifi_seq & 0xff) != q->write_ptr,
1760                   "Q: %d WiFi Seq %d tfdNum %d",
1761                   txq_id, wifi_seq, q->write_ptr);
1762
1763         /* Set up driver data for this TFD */
1764         txq->entries[q->write_ptr].skb = skb;
1765         txq->entries[q->write_ptr].cmd = dev_cmd;
1766
1767         dev_cmd->hdr.sequence =
1768                 cpu_to_le16((u16)(QUEUE_TO_SEQ(txq_id) |
1769                             INDEX_TO_SEQ(q->write_ptr)));
1770
1771         tb0_phys = iwl_pcie_get_scratchbuf_dma(txq, q->write_ptr);
1772         scratch_phys = tb0_phys + sizeof(struct iwl_cmd_header) +
1773                        offsetof(struct iwl_tx_cmd, scratch);
1774
1775         tx_cmd->dram_lsb_ptr = cpu_to_le32(scratch_phys);
1776         tx_cmd->dram_msb_ptr = iwl_get_dma_hi_addr(scratch_phys);
1777
1778         /* Set up first empty entry in queue's array of Tx/cmd buffers */
1779         out_meta = &txq->entries[q->write_ptr].meta;
1780
1781         /*
1782          * The second TB (tb1) points to the remainder of the TX command
1783          * and the 802.11 header - dword aligned size
1784          * (This calculation modifies the TX command, so do it before the
1785          * setup of the first TB)
1786          */
1787         len = sizeof(struct iwl_tx_cmd) + sizeof(struct iwl_cmd_header) +
1788               hdr_len - IWL_HCMD_SCRATCHBUF_SIZE;
1789         tb1_len = ALIGN(len, 4);
1790
1791         /* Tell NIC about any 2-byte padding after MAC header */
1792         if (tb1_len != len)
1793                 tx_cmd->tx_flags |= TX_CMD_FLG_MH_PAD_MSK;
1794
1795         /* The first TB points to the scratchbuf data - min_copy bytes */
1796         memcpy(&txq->scratchbufs[q->write_ptr], &dev_cmd->hdr,
1797                IWL_HCMD_SCRATCHBUF_SIZE);
1798         iwl_pcie_txq_build_tfd(trans, txq, tb0_phys,
1799                                IWL_HCMD_SCRATCHBUF_SIZE, true);
1800
1801         /* there must be data left over for TB1 or this code must be changed */
1802         BUILD_BUG_ON(sizeof(struct iwl_tx_cmd) < IWL_HCMD_SCRATCHBUF_SIZE);
1803
1804         /* map the data for TB1 */
1805         tb1_addr = ((u8 *)&dev_cmd->hdr) + IWL_HCMD_SCRATCHBUF_SIZE;
1806         tb1_phys = dma_map_single(trans->dev, tb1_addr, tb1_len, DMA_TO_DEVICE);
1807         if (unlikely(dma_mapping_error(trans->dev, tb1_phys)))
1808                 goto out_err;
1809         iwl_pcie_txq_build_tfd(trans, txq, tb1_phys, tb1_len, false);
1810
1811         /*
1812          * Set up TFD's third entry to point directly to remainder
1813          * of skb, if any (802.11 null frames have no payload).
1814          */
1815         tb2_len = skb->len - hdr_len;
1816         if (tb2_len > 0) {
1817                 dma_addr_t tb2_phys = dma_map_single(trans->dev,
1818                                                      skb->data + hdr_len,
1819                                                      tb2_len, DMA_TO_DEVICE);
1820                 if (unlikely(dma_mapping_error(trans->dev, tb2_phys))) {
1821                         iwl_pcie_tfd_unmap(trans, out_meta,
1822                                            &txq->tfds[q->write_ptr]);
1823                         goto out_err;
1824                 }
1825                 iwl_pcie_txq_build_tfd(trans, txq, tb2_phys, tb2_len, false);
1826         }
1827
1828         /* Set up entry for this TFD in Tx byte-count array */
1829         iwl_pcie_txq_update_byte_cnt_tbl(trans, txq, le16_to_cpu(tx_cmd->len));
1830
1831         trace_iwlwifi_dev_tx(trans->dev, skb,
1832                              &txq->tfds[txq->q.write_ptr],
1833                              sizeof(struct iwl_tfd),
1834                              &dev_cmd->hdr, IWL_HCMD_SCRATCHBUF_SIZE + tb1_len,
1835                              skb->data + hdr_len, tb2_len);
1836         trace_iwlwifi_dev_tx_data(trans->dev, skb,
1837                                   skb->data + hdr_len, tb2_len);
1838
1839         wait_write_ptr = ieee80211_has_morefrags(fc);
1840
1841         /* start timer if queue currently empty */
1842         if (q->read_ptr == q->write_ptr) {
1843                 if (txq->need_update && trans_pcie->wd_timeout)
1844                         mod_timer(&txq->stuck_timer,
1845                                   jiffies + trans_pcie->wd_timeout);
1846                 IWL_DEBUG_RPM(trans, "Q: %d first tx - take ref\n", q->id);
1847                 iwl_trans_pcie_ref(trans);
1848         }
1849
1850         /* Tell device the write index *just past* this latest filled TFD */
1851         q->write_ptr = iwl_queue_inc_wrap(q->write_ptr);
1852         if (!wait_write_ptr)
1853                 iwl_pcie_txq_inc_wr_ptr(trans, txq);
1854
1855         /*
1856          * At this point the frame is "transmitted" successfully
1857          * and we will get a TX status notification eventually.
1858          */
1859         if (iwl_queue_space(q) < q->high_mark) {
1860                 if (wait_write_ptr)
1861                         iwl_pcie_txq_inc_wr_ptr(trans, txq);
1862                 else
1863                         iwl_stop_queue(trans, txq);
1864         }
1865         spin_unlock(&txq->lock);
1866         return 0;
1867 out_err:
1868         spin_unlock(&txq->lock);
1869         return -1;
1870 }