drivers/net/wireless/iwlwifi/iwl-trans-tx-pcie.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2011 Intel Corporation. All rights reserved.
   4  *
   5  * Portions of this file are derived from the ipw3945 project, as well
   6  * as portions of the ieee80211 subsystem header files.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of version 2 of the GNU General Public License as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along with
  18  * this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  20  *
  21  * The full GNU General Public License is included in this distribution in the
  22  * file called LICENSE.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <ilw@linux.intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *
  28  *****************************************************************************/
  29 #include <linux/etherdevice.h>
  30 #include <linux/slab.h>
  31 #include <linux/sched.h>
  32 #include <net/mac80211.h>
  33
  34 #include "iwl-agn.h"
  35 #include "iwl-dev.h"
  36 #include "iwl-core.h"
  37 #include "iwl-io.h"
  38 #include "iwl-helpers.h"
  39 #include "iwl-trans-int-pcie.h"
  40
  41 /**
  42  * iwl_txq_update_write_ptr - Send new write index to hardware
  43  */
  44 void iwl_txq_update_write_ptr(struct iwl_priv *priv, struct iwl_tx_queue *txq)
  45 {
  46         u32 reg = 0;
  47         int txq_id = txq->q.id;
  48
  49         if (txq->need_update == 0)
  50                 return;
  51
  52         if (priv->cfg->base_params->shadow_reg_enable) {
  53                 /* shadow register enabled */
  54                 iwl_write32(priv, HBUS_TARG_WRPTR,
  55                             txq->q.write_ptr | (txq_id << 8));
  56         } else {
  57                 /* if we're trying to save power */
  58                 if (test_bit(STATUS_POWER_PMI, &priv->status)) {
  59                         /* wake up nic if it's powered down ...
  60                          * uCode will wake up, and interrupt us again, so next
  61                          * time we'll skip this part. */
  62                         reg = iwl_read32(priv, CSR_UCODE_DRV_GP1);
  63
  64                         if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
  65                                 IWL_DEBUG_INFO(priv,
  66                                         "Tx queue %d requesting wakeup,"
  67                                         " GP1 = 0x%x\n", txq_id, reg);
  68                                 iwl_set_bit(priv, CSR_GP_CNTRL,
  69                                         CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
  70                                 return;
  71                         }
  72
  73                         iwl_write_direct32(priv, HBUS_TARG_WRPTR,
  74                                      txq->q.write_ptr | (txq_id << 8));
  75
  76                 /*
  77                  * else not in power-save mode,
  78                  * uCode will never sleep when we're
  79                  * trying to tx (during RFKILL, we're not trying to tx).
  80                  */
  81                 } else
  82                         iwl_write32(priv, HBUS_TARG_WRPTR,
  83                                     txq->q.write_ptr | (txq_id << 8));
  84         }
  85         txq->need_update = 0;
  86 }
  87
  88 static inline dma_addr_t iwl_tfd_tb_get_addr(struct iwl_tfd *tfd, u8 idx)
  89 {
  90         struct iwl_tfd_tb *tb = &tfd->tbs[idx];
  91
  92         dma_addr_t addr = get_unaligned_le32(&tb->lo);
  93         if (sizeof(dma_addr_t) > sizeof(u32))
  94                 addr |=
  95                 ((dma_addr_t)(le16_to_cpu(tb->hi_n_len) & 0xF) << 16) << 16;
  96
  97         return addr;
  98 }
  99
 100 static inline u16 iwl_tfd_tb_get_len(struct iwl_tfd *tfd, u8 idx)
 101 {
 102         struct iwl_tfd_tb *tb = &tfd->tbs[idx];
 103
 104         return le16_to_cpu(tb->hi_n_len) >> 4;
 105 }
 106
 107 static inline void iwl_tfd_set_tb(struct iwl_tfd *tfd, u8 idx,
 108                                   dma_addr_t addr, u16 len)
 109 {
 110         struct iwl_tfd_tb *tb = &tfd->tbs[idx];
 111         u16 hi_n_len = len << 4;
 112
 113         put_unaligned_le32(addr, &tb->lo);
 114         if (sizeof(dma_addr_t) > sizeof(u32))
 115                 hi_n_len |= ((addr >> 16) >> 16) & 0xF;
 116
 117         tb->hi_n_len = cpu_to_le16(hi_n_len);
 118
 119         tfd->num_tbs = idx + 1;
 120 }
 121
 122 static inline u8 iwl_tfd_get_num_tbs(struct iwl_tfd *tfd)
 123 {
 124         return tfd->num_tbs & 0x1f;
 125 }
 126
 127 static void iwlagn_unmap_tfd(struct iwl_priv *priv, struct iwl_cmd_meta *meta,
 128                      struct iwl_tfd *tfd, enum dma_data_direction dma_dir)
 129 {
 130         int i;
 131         int num_tbs;
 132
 133         /* Sanity check on number of chunks */
 134         num_tbs = iwl_tfd_get_num_tbs(tfd);
 135
 136         if (num_tbs >= IWL_NUM_OF_TBS) {
 137                 IWL_ERR(priv, "Too many chunks: %i\n", num_tbs);
 138                 /* @todo issue fatal error, it is quite serious situation */
 139                 return;
 140         }
 141
 142         /* Unmap tx_cmd */
 143         if (num_tbs)
 144                 dma_unmap_single(priv->bus.dev,
 145                                 dma_unmap_addr(meta, mapping),
 146                                 dma_unmap_len(meta, len),
 147                                 DMA_BIDIRECTIONAL);
 148
 149         /* Unmap chunks, if any. */
 150         for (i = 1; i < num_tbs; i++)
 151                 dma_unmap_single(priv->bus.dev, iwl_tfd_tb_get_addr(tfd, i),
 152                                 iwl_tfd_tb_get_len(tfd, i), dma_dir);
 153 }
 154
 155 /**
 156  * iwlagn_txq_free_tfd - Free all chunks referenced by TFD [txq->q.read_ptr]
 157  * @priv - driver private data
 158  * @txq - tx queue
 159  * @index - the index of the TFD to be freed
 160  *
 161  * Does NOT advance any TFD circular buffer read/write indexes
 162  * Does NOT free the TFD itself (which is within circular buffer)
 163  */
 164 void iwlagn_txq_free_tfd(struct iwl_priv *priv, struct iwl_tx_queue *txq,
 165         int index)
 166 {
 167         struct iwl_tfd *tfd_tmp = txq->tfds;
 168
 169         iwlagn_unmap_tfd(priv, &txq->meta[index], &tfd_tmp[index],
 170                          DMA_TO_DEVICE);
 171
 172         /* free SKB */
 173         if (txq->txb) {
 174                 struct sk_buff *skb;
 175
 176                 skb = txq->txb[index].skb;
 177
 178                 /* can be called from irqs-disabled context */
 179                 if (skb) {
 180                         dev_kfree_skb_any(skb);
 181                         txq->txb[index].skb = NULL;
 182                 }
 183         }
 184 }
 185
 186 int iwlagn_txq_attach_buf_to_tfd(struct iwl_priv *priv,
 187                                  struct iwl_tx_queue *txq,
 188                                  dma_addr_t addr, u16 len,
 189                                  u8 reset)
 190 {
 191         struct iwl_queue *q;
 192         struct iwl_tfd *tfd, *tfd_tmp;
 193         u32 num_tbs;
 194
 195         q = &txq->q;
 196         tfd_tmp = txq->tfds;
 197         tfd = &tfd_tmp[q->write_ptr];
 198
 199         if (reset)
 200                 memset(tfd, 0, sizeof(*tfd));
 201
 202         num_tbs = iwl_tfd_get_num_tbs(tfd);
 203
 204         /* Each TFD can point to a maximum 20 Tx buffers */
 205         if (num_tbs >= IWL_NUM_OF_TBS) {
 206                 IWL_ERR(priv, "Error can not send more than %d chunks\n",
 207                           IWL_NUM_OF_TBS);
 208                 return -EINVAL;
 209         }
 210
 211         if (WARN_ON(addr & ~DMA_BIT_MASK(36)))
 212                 return -EINVAL;
 213
 214         if (unlikely(addr & ~IWL_TX_DMA_MASK))
 215                 IWL_ERR(priv, "Unaligned address = %llx\n",
 216                           (unsigned long long)addr);
 217
 218         iwl_tfd_set_tb(tfd, num_tbs, addr, len);
 219
 220         return 0;
 221 }
 222
 223 /*************** DMA-QUEUE-GENERAL-FUNCTIONS  *****
 224  * DMA services
 225  *
 226  * Theory of operation
 227  *
 228  * A Tx or Rx queue resides in host DRAM, and is comprised of a circular buffer
 229  * of buffer descriptors, each of which points to one or more data buffers for
 230  * the device to read from or fill.  Driver and device exchange status of each
 231  * queue via "read" and "write" pointers.  Driver keeps minimum of 2 empty
 232  * entries in each circular buffer, to protect against confusing empty and full
 233  * queue states.
 234  *
 235  * The device reads or writes the data in the queues via the device's several
 236  * DMA/FIFO channels.  Each queue is mapped to a single DMA channel.
 237  *
 238  * For Tx queue, there are low mark and high mark limits. If, after queuing
 239  * the packet for Tx, free space become < low mark, Tx queue stopped. When
 240  * reclaiming packets (on 'tx done IRQ), if free space become > high mark,
 241  * Tx queue resumed.
 242  *
 243  ***************************************************/
 244
 245 int iwl_queue_space(const struct iwl_queue *q)
 246 {
 247         int s = q->read_ptr - q->write_ptr;
 248
 249         if (q->read_ptr > q->write_ptr)
 250                 s -= q->n_bd;
 251
 252         if (s <= 0)
 253                 s += q->n_window;
 254         /* keep some reserve to not confuse empty and full situations */
 255         s -= 2;
 256         if (s < 0)
 257                 s = 0;
 258         return s;
 259 }
 260
 261 /**
 262  * iwl_queue_init - Initialize queue's high/low-water and read/write indexes
 263  */
 264 int iwl_queue_init(struct iwl_priv *priv, struct iwl_queue *q,
 265                           int count, int slots_num, u32 id)
 266 {
 267         q->n_bd = count;
 268         q->n_window = slots_num;
 269         q->id = id;
 270
 271         /* count must be power-of-two size, otherwise iwl_queue_inc_wrap
 272          * and iwl_queue_dec_wrap are broken. */
 273         if (WARN_ON(!is_power_of_2(count)))
 274                 return -EINVAL;
 275
 276         /* slots_num must be power-of-two size, otherwise
 277          * get_cmd_index is broken. */
 278         if (WARN_ON(!is_power_of_2(slots_num)))
 279                 return -EINVAL;
 280
 281         q->low_mark = q->n_window / 4;
 282         if (q->low_mark < 4)
 283                 q->low_mark = 4;
 284
 285         q->high_mark = q->n_window / 8;
 286         if (q->high_mark < 2)
 287                 q->high_mark = 2;
 288
 289         q->write_ptr = q->read_ptr = 0;
 290
 291         return 0;
 292 }
 293
 294 /*************** HOST COMMAND QUEUE FUNCTIONS   *****/
 295
 296 /**
 297  * iwl_enqueue_hcmd - enqueue a uCode command
 298  * @priv: device private data point
 299  * @cmd: a point to the ucode command structure
 300  *
 301  * The function returns < 0 values to indicate the operation is
 302  * failed. On success, it turns the index (> 0) of command in the
 303  * command queue.
 304  */
 305 static int iwl_enqueue_hcmd(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 306 {
 307         struct iwl_tx_queue *txq = &priv->txq[priv->cmd_queue];
 308         struct iwl_queue *q = &txq->q;
 309         struct iwl_device_cmd *out_cmd;
 310         struct iwl_cmd_meta *out_meta;
 311         dma_addr_t phys_addr;
 312         unsigned long flags;
 313         u32 idx;
 314         u16 copy_size, cmd_size;
 315         bool is_ct_kill = false;
 316         bool had_nocopy = false;
 317         int i;
 318         u8 *cmd_dest;
 319 #ifdef CONFIG_IWLWIFI_DEVICE_TRACING
 320         const void *trace_bufs[IWL_MAX_CMD_TFDS + 1] = {};
 321         int trace_lens[IWL_MAX_CMD_TFDS + 1] = {};
 322         int trace_idx;
 323 #endif
 324
 325         if (test_bit(STATUS_FW_ERROR, &priv->status)) {
 326                 IWL_WARN(priv, "fw recovery, no hcmd send\n");
 327                 return -EIO;
 328         }
 329
 330         if ((priv->ucode_owner == IWL_OWNERSHIP_TM) &&
 331             !(cmd->flags & CMD_ON_DEMAND)) {
 332                 IWL_DEBUG_HC(priv, "tm own the uCode, no regular hcmd send\n");
 333                 return -EIO;
 334         }
 335
 336         copy_size = sizeof(out_cmd->hdr);
 337         cmd_size = sizeof(out_cmd->hdr);
 338
 339         /* need one for the header if the first is NOCOPY */
 340         BUILD_BUG_ON(IWL_MAX_CMD_TFDS > IWL_NUM_OF_TBS - 1);
 341
 342         for (i = 0; i < IWL_MAX_CMD_TFDS; i++) {
 343                 if (!cmd->len[i])
 344                         continue;
 345                 if (cmd->dataflags[i] & IWL_HCMD_DFL_NOCOPY) {
 346                         had_nocopy = true;
 347                 } else {
 348                         /* NOCOPY must not be followed by normal! */
 349                         if (WARN_ON(had_nocopy))
 350                                 return -EINVAL;
 351                         copy_size += cmd->len[i];
 352                 }
 353                 cmd_size += cmd->len[i];
 354         }
 355
 356         /*
 357          * If any of the command structures end up being larger than
 358          * the TFD_MAX_PAYLOAD_SIZE and they aren't dynamically
 359          * allocated into separate TFDs, then we will need to
 360          * increase the size of the buffers.
 361          */
 362         if (WARN_ON(copy_size > TFD_MAX_PAYLOAD_SIZE))
 363                 return -EINVAL;
 364
 365         if (iwl_is_rfkill(priv) || iwl_is_ctkill(priv)) {
 366                 IWL_WARN(priv, "Not sending command - %s KILL\n",
 367                          iwl_is_rfkill(priv) ? "RF" : "CT");
 368                 return -EIO;
 369         }
 370
 371         spin_lock_irqsave(&priv->hcmd_lock, flags);
 372
 373         if (iwl_queue_space(q) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) {
 374                 spin_unlock_irqrestore(&priv->hcmd_lock, flags);
 375
 376                 IWL_ERR(priv, "No space in command queue\n");
 377                 is_ct_kill = iwl_check_for_ct_kill(priv);
 378                 if (!is_ct_kill) {
 379                         IWL_ERR(priv, "Restarting adapter due to queue full\n");
 380                         iwlagn_fw_error(priv, false);
 381                 }
 382                 return -ENOSPC;
 383         }
 384
 385         idx = get_cmd_index(q, q->write_ptr);
 386         out_cmd = txq->cmd[idx];
 387         out_meta = &txq->meta[idx];
 388
 389         memset(out_meta, 0, sizeof(*out_meta)); /* re-initialize to NULL */
 390         if (cmd->flags & CMD_WANT_SKB)
 391                 out_meta->source = cmd;
 392         if (cmd->flags & CMD_ASYNC)
 393                 out_meta->callback = cmd->callback;
 394
 395         /* set up the header */
 396
 397         out_cmd->hdr.cmd = cmd->id;
 398         out_cmd->hdr.flags = 0;
 399         out_cmd->hdr.sequence = cpu_to_le16(QUEUE_TO_SEQ(priv->cmd_queue) |
 400                                             INDEX_TO_SEQ(q->write_ptr));
 401
 402         /* and copy the data that needs to be copied */
 403
 404         cmd_dest = &out_cmd->cmd.payload[0];
 405         for (i = 0; i < IWL_MAX_CMD_TFDS; i++) {
 406                 if (!cmd->len[i])
 407                         continue;
 408                 if (cmd->dataflags[i] & IWL_HCMD_DFL_NOCOPY)
 409                         break;
 410                 memcpy(cmd_dest, cmd->data[i], cmd->len[i]);
 411                 cmd_dest += cmd->len[i];
 412         }
 413
 414         IWL_DEBUG_HC(priv, "Sending command %s (#%x), seq: 0x%04X, "
 415                         "%d bytes at %d[%d]:%d\n",
 416                         get_cmd_string(out_cmd->hdr.cmd),
 417                         out_cmd->hdr.cmd,
 418                         le16_to_cpu(out_cmd->hdr.sequence), cmd_size,
 419                         q->write_ptr, idx, priv->cmd_queue);
 420
 421         phys_addr = dma_map_single(priv->bus.dev, &out_cmd->hdr, copy_size,
 422                                 DMA_BIDIRECTIONAL);
 423         if (unlikely(dma_mapping_error(priv->bus.dev, phys_addr))) {
 424                 idx = -ENOMEM;
 425                 goto out;
 426         }
 427
 428         dma_unmap_addr_set(out_meta, mapping, phys_addr);
 429         dma_unmap_len_set(out_meta, len, copy_size);
 430
 431         iwlagn_txq_attach_buf_to_tfd(priv, txq, phys_addr, copy_size, 1);
 432 #ifdef CONFIG_IWLWIFI_DEVICE_TRACING
 433         trace_bufs[0] = &out_cmd->hdr;
 434         trace_lens[0] = copy_size;
 435         trace_idx = 1;
 436 #endif
 437
 438         for (i = 0; i < IWL_MAX_CMD_TFDS; i++) {
 439                 if (!cmd->len[i])
 440                         continue;
 441                 if (!(cmd->dataflags[i] & IWL_HCMD_DFL_NOCOPY))
 442                         continue;
 443                 phys_addr = dma_map_single(priv->bus.dev, (void *)cmd->data[i],
 444                                            cmd->len[i], DMA_BIDIRECTIONAL);
 445                 if (dma_mapping_error(priv->bus.dev, phys_addr)) {
 446                         iwlagn_unmap_tfd(priv, out_meta,
 447                                          &txq->tfds[q->write_ptr],
 448                                          DMA_BIDIRECTIONAL);
 449                         idx = -ENOMEM;
 450                         goto out;
 451                 }
 452
 453                 iwlagn_txq_attach_buf_to_tfd(priv, txq, phys_addr,
 454                                              cmd->len[i], 0);
 455 #ifdef CONFIG_IWLWIFI_DEVICE_TRACING
 456                 trace_bufs[trace_idx] = cmd->data[i];
 457                 trace_lens[trace_idx] = cmd->len[i];
 458                 trace_idx++;
 459 #endif
 460         }
 461
 462         out_meta->flags = cmd->flags;
 463
 464         txq->need_update = 1;
 465
 466         /* check that tracing gets all possible blocks */
 467         BUILD_BUG_ON(IWL_MAX_CMD_TFDS + 1 != 3);
 468 #ifdef CONFIG_IWLWIFI_DEVICE_TRACING
 469         trace_iwlwifi_dev_hcmd(priv, cmd->flags,
 470                                trace_bufs[0], trace_lens[0],
 471                                trace_bufs[1], trace_lens[1],
 472                                trace_bufs[2], trace_lens[2]);
 473 #endif
 474
 475         /* Increment and update queue's write index */
 476         q->write_ptr = iwl_queue_inc_wrap(q->write_ptr, q->n_bd);
 477         iwl_txq_update_write_ptr(priv, txq);
 478
 479  out:
 480         spin_unlock_irqrestore(&priv->hcmd_lock, flags);
 481         return idx;
 482 }
 483
 484 /**
 485  * iwl_hcmd_queue_reclaim - Reclaim TX command queue entries already Tx'd
 486  *
 487  * When FW advances 'R' index, all entries between old and new 'R' index
 488  * need to be reclaimed. As result, some free space forms.  If there is
 489  * enough free space (> low mark), wake the stack that feeds us.
 490  */
 491 static void iwl_hcmd_queue_reclaim(struct iwl_priv *priv, int txq_id, int idx)
 492 {
 493         struct iwl_tx_queue *txq = &priv->txq[txq_id];
 494         struct iwl_queue *q = &txq->q;
 495         int nfreed = 0;
 496
 497         if ((idx >= q->n_bd) || (iwl_queue_used(q, idx) == 0)) {
 498                 IWL_ERR(priv, "%s: Read index for DMA queue txq id (%d), "
 499                           "index %d is out of range [0-%d] %d %d.\n", __func__,
 500                           txq_id, idx, q->n_bd, q->write_ptr, q->read_ptr);
 501                 return;
 502         }
 503
 504         for (idx = iwl_queue_inc_wrap(idx, q->n_bd); q->read_ptr != idx;
 505              q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd)) {
 506
 507                 if (nfreed++ > 0) {
 508                         IWL_ERR(priv, "HCMD skipped: index (%d) %d %d\n", idx,
 509                                         q->write_ptr, q->read_ptr);
 510                         iwlagn_fw_error(priv, false);
 511                 }
 512
 513         }
 514 }
 515
 516 /**
 517  * iwl_tx_cmd_complete - Pull unused buffers off the queue and reclaim them
 518  * @rxb: Rx buffer to reclaim
 519  *
 520  * If an Rx buffer has an async callback associated with it the callback
 521  * will be executed.  The attached skb (if present) will only be freed
 522  * if the callback returns 1
 523  */
 524 void iwl_tx_cmd_complete(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb)
 525 {
 526         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 527         u16 sequence = le16_to_cpu(pkt->hdr.sequence);
 528         int txq_id = SEQ_TO_QUEUE(sequence);
 529         int index = SEQ_TO_INDEX(sequence);
 530         int cmd_index;
 531         struct iwl_device_cmd *cmd;
 532         struct iwl_cmd_meta *meta;
 533         struct iwl_tx_queue *txq = &priv->txq[priv->cmd_queue];
 534         unsigned long flags;
 535
 536         /* If a Tx command is being handled and it isn't in the actual
 537          * command queue then there a command routing bug has been introduced
 538          * in the queue management code. */
 539         if (WARN(txq_id != priv->cmd_queue,
 540                  "wrong command queue %d (should be %d), sequence 0x%X readp=%d writep=%d\n",
 541                   txq_id, priv->cmd_queue, sequence,
 542                   priv->txq[priv->cmd_queue].q.read_ptr,
 543                   priv->txq[priv->cmd_queue].q.write_ptr)) {
 544                 iwl_print_hex_error(priv, pkt, 32);
 545                 return;
 546         }
 547
 548         cmd_index = get_cmd_index(&txq->q, index);
 549         cmd = txq->cmd[cmd_index];
 550         meta = &txq->meta[cmd_index];
 551
 552         iwlagn_unmap_tfd(priv, meta, &txq->tfds[index], DMA_BIDIRECTIONAL);
 553
 554         /* Input error checking is done when commands are added to queue. */
 555         if (meta->flags & CMD_WANT_SKB) {
 556                 meta->source->reply_page = (unsigned long)rxb_addr(rxb);
 557                 rxb->page = NULL;
 558         } else if (meta->callback)
 559                 meta->callback(priv, cmd, pkt);
 560
 561         spin_lock_irqsave(&priv->hcmd_lock, flags);
 562
 563         iwl_hcmd_queue_reclaim(priv, txq_id, index);
 564
 565         if (!(meta->flags & CMD_ASYNC)) {
 566                 clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
 567                 IWL_DEBUG_INFO(priv, "Clearing HCMD_ACTIVE for command %s\n",
 568                                get_cmd_string(cmd->hdr.cmd));
 569                 wake_up_interruptible(&priv->wait_command_queue);
 570         }
 571
 572         meta->flags = 0;
 573
 574         spin_unlock_irqrestore(&priv->hcmd_lock, flags);
 575 }
 576
 577 const char *get_cmd_string(u8 cmd)
 578 {
 579         switch (cmd) {
 580                 IWL_CMD(REPLY_ALIVE);
 581                 IWL_CMD(REPLY_ERROR);
 582                 IWL_CMD(REPLY_RXON);
 583                 IWL_CMD(REPLY_RXON_ASSOC);
 584                 IWL_CMD(REPLY_QOS_PARAM);
 585                 IWL_CMD(REPLY_RXON_TIMING);
 586                 IWL_CMD(REPLY_ADD_STA);
 587                 IWL_CMD(REPLY_REMOVE_STA);
 588                 IWL_CMD(REPLY_REMOVE_ALL_STA);
 589                 IWL_CMD(REPLY_TXFIFO_FLUSH);
 590                 IWL_CMD(REPLY_WEPKEY);
 591                 IWL_CMD(REPLY_TX);
 592                 IWL_CMD(REPLY_LEDS_CMD);
 593                 IWL_CMD(REPLY_TX_LINK_QUALITY_CMD);
 594                 IWL_CMD(COEX_PRIORITY_TABLE_CMD);
 595                 IWL_CMD(COEX_MEDIUM_NOTIFICATION);
 596                 IWL_CMD(COEX_EVENT_CMD);
 597                 IWL_CMD(REPLY_QUIET_CMD);
 598                 IWL_CMD(REPLY_CHANNEL_SWITCH);
 599                 IWL_CMD(CHANNEL_SWITCH_NOTIFICATION);
 600                 IWL_CMD(REPLY_SPECTRUM_MEASUREMENT_CMD);
 601                 IWL_CMD(SPECTRUM_MEASURE_NOTIFICATION);
 602                 IWL_CMD(POWER_TABLE_CMD);
 603                 IWL_CMD(PM_SLEEP_NOTIFICATION);
 604                 IWL_CMD(PM_DEBUG_STATISTIC_NOTIFIC);
 605                 IWL_CMD(REPLY_SCAN_CMD);
 606                 IWL_CMD(REPLY_SCAN_ABORT_CMD);
 607                 IWL_CMD(SCAN_START_NOTIFICATION);
 608                 IWL_CMD(SCAN_RESULTS_NOTIFICATION);
 609                 IWL_CMD(SCAN_COMPLETE_NOTIFICATION);
 610                 IWL_CMD(BEACON_NOTIFICATION);
 611                 IWL_CMD(REPLY_TX_BEACON);
 612                 IWL_CMD(WHO_IS_AWAKE_NOTIFICATION);
 613                 IWL_CMD(QUIET_NOTIFICATION);
 614                 IWL_CMD(REPLY_TX_PWR_TABLE_CMD);
 615                 IWL_CMD(MEASURE_ABORT_NOTIFICATION);
 616                 IWL_CMD(REPLY_BT_CONFIG);
 617                 IWL_CMD(REPLY_STATISTICS_CMD);
 618                 IWL_CMD(STATISTICS_NOTIFICATION);
 619                 IWL_CMD(REPLY_CARD_STATE_CMD);
 620                 IWL_CMD(CARD_STATE_NOTIFICATION);
 621                 IWL_CMD(MISSED_BEACONS_NOTIFICATION);
 622                 IWL_CMD(REPLY_CT_KILL_CONFIG_CMD);
 623                 IWL_CMD(SENSITIVITY_CMD);
 624                 IWL_CMD(REPLY_PHY_CALIBRATION_CMD);
 625                 IWL_CMD(REPLY_RX_PHY_CMD);
 626                 IWL_CMD(REPLY_RX_MPDU_CMD);
 627                 IWL_CMD(REPLY_RX);
 628                 IWL_CMD(REPLY_COMPRESSED_BA);
 629                 IWL_CMD(CALIBRATION_CFG_CMD);
 630                 IWL_CMD(CALIBRATION_RES_NOTIFICATION);
 631                 IWL_CMD(CALIBRATION_COMPLETE_NOTIFICATION);
 632                 IWL_CMD(REPLY_TX_POWER_DBM_CMD);
 633                 IWL_CMD(TEMPERATURE_NOTIFICATION);
 634                 IWL_CMD(TX_ANT_CONFIGURATION_CMD);
 635                 IWL_CMD(REPLY_BT_COEX_PROFILE_NOTIF);
 636                 IWL_CMD(REPLY_BT_COEX_PRIO_TABLE);
 637                 IWL_CMD(REPLY_BT_COEX_PROT_ENV);
 638                 IWL_CMD(REPLY_WIPAN_PARAMS);
 639                 IWL_CMD(REPLY_WIPAN_RXON);
 640                 IWL_CMD(REPLY_WIPAN_RXON_TIMING);
 641                 IWL_CMD(REPLY_WIPAN_RXON_ASSOC);
 642                 IWL_CMD(REPLY_WIPAN_QOS_PARAM);
 643                 IWL_CMD(REPLY_WIPAN_WEPKEY);
 644                 IWL_CMD(REPLY_WIPAN_P2P_CHANNEL_SWITCH);
 645                 IWL_CMD(REPLY_WIPAN_NOA_NOTIFICATION);
 646                 IWL_CMD(REPLY_WIPAN_DEACTIVATION_COMPLETE);
 647         default:
 648                 return "UNKNOWN";
 649
 650         }
 651 }
 652
 653 #define HOST_COMPLETE_TIMEOUT (2 * HZ)
 654
 655 static void iwl_generic_cmd_callback(struct iwl_priv *priv,
 656                                      struct iwl_device_cmd *cmd,
 657                                      struct iwl_rx_packet *pkt)
 658 {
 659         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 660                 IWL_ERR(priv, "Bad return from %s (0x%08X)\n",
 661                         get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 662                 return;
 663         }
 664
 665 #ifdef CONFIG_IWLWIFI_DEBUG
 666         switch (cmd->hdr.cmd) {
 667         case REPLY_TX_LINK_QUALITY_CMD:
 668         case SENSITIVITY_CMD:
 669                 IWL_DEBUG_HC_DUMP(priv, "back from %s (0x%08X)\n",
 670                                 get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 671                 break;
 672         default:
 673                 IWL_DEBUG_HC(priv, "back from %s (0x%08X)\n",
 674                                 get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 675         }
 676 #endif
 677 }
 678
 679 static int iwl_send_cmd_async(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 680 {
 681         int ret;
 682
 683         /* An asynchronous command can not expect an SKB to be set. */
 684         if (WARN_ON(cmd->flags & CMD_WANT_SKB))
 685                 return -EINVAL;
 686
 687         /* Assign a generic callback if one is not provided */
 688         if (!cmd->callback)
 689                 cmd->callback = iwl_generic_cmd_callback;
 690
 691         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 692                 return -EBUSY;
 693
 694         ret = iwl_enqueue_hcmd(priv, cmd);
 695         if (ret < 0) {
 696                 IWL_ERR(priv, "Error sending %s: enqueue_hcmd failed: %d\n",
 697                           get_cmd_string(cmd->id), ret);
 698                 return ret;
 699         }
 700         return 0;
 701 }
 702
 703 static int iwl_send_cmd_sync(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 704 {
 705         int cmd_idx;
 706         int ret;
 707
 708         lockdep_assert_held(&priv->mutex);
 709
 710          /* A synchronous command can not have a callback set. */
 711         if (WARN_ON(cmd->callback))
 712                 return -EINVAL;
 713
 714         IWL_DEBUG_INFO(priv, "Attempting to send sync command %s\n",
 715                         get_cmd_string(cmd->id));
 716
 717         set_bit(STATUS_HCMD_ACTIVE, &priv->status);
 718         IWL_DEBUG_INFO(priv, "Setting HCMD_ACTIVE for command %s\n",
 719                         get_cmd_string(cmd->id));
 720
 721         cmd_idx = iwl_enqueue_hcmd(priv, cmd);
 722         if (cmd_idx < 0) {
 723                 ret = cmd_idx;
 724                 clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
 725                 IWL_ERR(priv, "Error sending %s: enqueue_hcmd failed: %d\n",
 726                           get_cmd_string(cmd->id), ret);
 727                 return ret;
 728         }
 729
 730         ret = wait_event_interruptible_timeout(priv->wait_command_queue,
 731                         !test_bit(STATUS_HCMD_ACTIVE, &priv->status),
 732                         HOST_COMPLETE_TIMEOUT);
 733         if (!ret) {
 734                 if (test_bit(STATUS_HCMD_ACTIVE, &priv->status)) {
 735                         IWL_ERR(priv,
 736                                 "Error sending %s: time out after %dms.\n",
 737                                 get_cmd_string(cmd->id),
 738                                 jiffies_to_msecs(HOST_COMPLETE_TIMEOUT));
 739
 740                         clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
 741                         IWL_DEBUG_INFO(priv, "Clearing HCMD_ACTIVE for command"
 742                                  "%s\n", get_cmd_string(cmd->id));
 743                         ret = -ETIMEDOUT;
 744                         goto cancel;
 745                 }
 746         }
 747
 748         if (test_bit(STATUS_RF_KILL_HW, &priv->status)) {
 749                 IWL_ERR(priv, "Command %s aborted: RF KILL Switch\n",
 750                                get_cmd_string(cmd->id));
 751                 ret = -ECANCELED;
 752                 goto fail;
 753         }
 754         if (test_bit(STATUS_FW_ERROR, &priv->status)) {
 755                 IWL_ERR(priv, "Command %s failed: FW Error\n",
 756                                get_cmd_string(cmd->id));
 757                 ret = -EIO;
 758                 goto fail;
 759         }
 760         if ((cmd->flags & CMD_WANT_SKB) && !cmd->reply_page) {
 761                 IWL_ERR(priv, "Error: Response NULL in '%s'\n",
 762                           get_cmd_string(cmd->id));
 763                 ret = -EIO;
 764                 goto cancel;
 765         }
 766
 767         return 0;
 768
 769 cancel:
 770         if (cmd->flags & CMD_WANT_SKB) {
 771                 /*
 772                  * Cancel the CMD_WANT_SKB flag for the cmd in the
 773                  * TX cmd queue. Otherwise in case the cmd comes
 774                  * in later, it will possibly set an invalid
 775                  * address (cmd->meta.source).
 776                  */
 777                 priv->txq[priv->cmd_queue].meta[cmd_idx].flags &=
 778                                                         ~CMD_WANT_SKB;
 779         }
 780 fail:
 781         if (cmd->reply_page) {
 782                 iwl_free_pages(priv, cmd->reply_page);
 783                 cmd->reply_page = 0;
 784         }
 785
 786         return ret;
 787 }
 788
 789 int iwl_send_cmd(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 790 {
 791         if (cmd->flags & CMD_ASYNC)
 792                 return iwl_send_cmd_async(priv, cmd);
 793
 794         return iwl_send_cmd_sync(priv, cmd);
 795 }
 796
 797 int iwl_send_cmd_pdu(struct iwl_priv *priv, u8 id, u32 flags, u16 len,
 798                      const void *data)
 799 {
 800         struct iwl_host_cmd cmd = {
 801                 .id = id,
 802                 .len = { len, },
 803                 .data = { data, },
 804                 .flags = flags,
 805         };
 806
 807         return iwl_send_cmd(priv, &cmd);
 808 }