drivers/net/wireless/iwlwifi/mvm/ops.c

   1 /******************************************************************************
   2  *
   3  * This file is provided under a dual BSD/GPLv2 license.  When using or
   4  * redistributing this file, you may do so under either license.
   5  *
   6  * GPL LICENSE SUMMARY
   7  *
   8  * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of version 2 of the GNU General Public License as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  22  * USA
  23  *
  24  * The full GNU General Public License is included in this distribution
  25  * in the file called LICENSE.GPL.
  26  *
  27  * Contact Information:
  28  *  Intel Linux Wireless <ilw@linux.intel.com>
  29  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  30  *
  31  * BSD LICENSE
  32  *
  33  * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
  34  * All rights reserved.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  *
  40  *  * Redistributions of source code must retain the above copyright
  41  *    notice, this list of conditions and the following disclaimer.
  42  *  * Redistributions in binary form must reproduce the above copyright
  43  *    notice, this list of conditions and the following disclaimer in
  44  *    the documentation and/or other materials provided with the
  45  *    distribution.
  46  *  * Neither the name Intel Corporation nor the names of its
  47  *    contributors may be used to endorse or promote products derived
  48  *    from this software without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  51  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  52  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  53  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  54  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  55  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  56  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  57  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  58  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  59  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  60  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  61  *
  62  *****************************************************************************/
  63 #include <linux/module.h>
  64 #include <net/mac80211.h>
  65
  66 #include "iwl-notif-wait.h"
  67 #include "iwl-trans.h"
  68 #include "iwl-op-mode.h"
  69 #include "iwl-fw.h"
  70 #include "iwl-debug.h"
  71 #include "iwl-drv.h"
  72 #include "iwl-modparams.h"
  73 #include "mvm.h"
  74 #include "iwl-phy-db.h"
  75 #include "iwl-eeprom-parse.h"
  76 #include "iwl-csr.h"
  77 #include "iwl-io.h"
  78 #include "iwl-prph.h"
  79 #include "rs.h"
  80 #include "fw-api-scan.h"
  81 #include "time-event.h"
  82
  83 /*
  84  * module name, copyright, version, etc.
  85  */
  86 #define DRV_DESCRIPTION "The new Intel(R) wireless AGN driver for Linux"
  87
  88 #define DRV_VERSION     IWLWIFI_VERSION
  89
  90 MODULE_DESCRIPTION(DRV_DESCRIPTION);
  91 MODULE_VERSION(DRV_VERSION);
  92 MODULE_AUTHOR(DRV_COPYRIGHT " " DRV_AUTHOR);
  93 MODULE_LICENSE("GPL");
  94
  95 static const struct iwl_op_mode_ops iwl_mvm_ops;
  96
  97 struct iwl_mvm_mod_params iwlmvm_mod_params = {
  98         .power_scheme = IWL_POWER_SCHEME_BPS,
  99         /* rest of fields are 0 by default */
 100 };
 101
 102 module_param_named(init_dbg, iwlmvm_mod_params.init_dbg, bool, S_IRUGO);
 103 MODULE_PARM_DESC(init_dbg,
 104                  "set to true to debug an ASSERT in INIT fw (default: false");
 105 module_param_named(power_scheme, iwlmvm_mod_params.power_scheme, int, S_IRUGO);
 106 MODULE_PARM_DESC(power_scheme,
 107                  "power management scheme: 1-active, 2-balanced, 3-low power, default: 2");
 108
 109 /*
 110  * module init and exit functions
 111  */
 112 static int __init iwl_mvm_init(void)
 113 {
 114         int ret;
 115
 116         ret = iwl_mvm_rate_control_register();
 117         if (ret) {
 118                 pr_err("Unable to register rate control algorithm: %d\n", ret);
 119                 return ret;
 120         }
 121
 122         ret = iwl_opmode_register("iwlmvm", &iwl_mvm_ops);
 123
 124         if (ret) {
 125                 pr_err("Unable to register MVM op_mode: %d\n", ret);
 126                 iwl_mvm_rate_control_unregister();
 127         }
 128
 129         return ret;
 130 }
 131 module_init(iwl_mvm_init);
 132
 133 static void __exit iwl_mvm_exit(void)
 134 {
 135         iwl_opmode_deregister("iwlmvm");
 136         iwl_mvm_rate_control_unregister();
 137 }
 138 module_exit(iwl_mvm_exit);
 139
 140 static void iwl_mvm_nic_config(struct iwl_op_mode *op_mode)
 141 {
 142         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
 143         u8 radio_cfg_type, radio_cfg_step, radio_cfg_dash;
 144         u32 reg_val = 0;
 145
 146         /*
 147          * We can't upload the correct value to the INIT image
 148          * as we don't have nvm_data by that time.
 149          *
 150          * TODO: Figure out what we should do here
 151          */
 152         if (mvm->nvm_data) {
 153                 radio_cfg_type = mvm->nvm_data->radio_cfg_type;
 154                 radio_cfg_step = mvm->nvm_data->radio_cfg_step;
 155                 radio_cfg_dash = mvm->nvm_data->radio_cfg_dash;
 156         } else {
 157                 radio_cfg_type = 0;
 158                 radio_cfg_step = 0;
 159                 radio_cfg_dash = 0;
 160         }
 161
 162         /* SKU control */
 163         reg_val |= CSR_HW_REV_STEP(mvm->trans->hw_rev) <<
 164                                 CSR_HW_IF_CONFIG_REG_POS_MAC_STEP;
 165         reg_val |= CSR_HW_REV_DASH(mvm->trans->hw_rev) <<
 166                                 CSR_HW_IF_CONFIG_REG_POS_MAC_DASH;
 167
 168         /* radio configuration */
 169         reg_val |= radio_cfg_type << CSR_HW_IF_CONFIG_REG_POS_PHY_TYPE;
 170         reg_val |= radio_cfg_step << CSR_HW_IF_CONFIG_REG_POS_PHY_STEP;
 171         reg_val |= radio_cfg_dash << CSR_HW_IF_CONFIG_REG_POS_PHY_DASH;
 172
 173         WARN_ON((radio_cfg_type << CSR_HW_IF_CONFIG_REG_POS_PHY_TYPE) &
 174                  ~CSR_HW_IF_CONFIG_REG_MSK_PHY_TYPE);
 175
 176         /* silicon bits */
 177         reg_val |= CSR_HW_IF_CONFIG_REG_BIT_RADIO_SI;
 178         reg_val |= CSR_HW_IF_CONFIG_REG_BIT_MAC_SI;
 179
 180         iwl_trans_set_bits_mask(mvm->trans, CSR_HW_IF_CONFIG_REG,
 181                                 CSR_HW_IF_CONFIG_REG_MSK_MAC_DASH |
 182                                 CSR_HW_IF_CONFIG_REG_MSK_MAC_STEP |
 183                                 CSR_HW_IF_CONFIG_REG_MSK_PHY_TYPE |
 184                                 CSR_HW_IF_CONFIG_REG_MSK_PHY_STEP |
 185                                 CSR_HW_IF_CONFIG_REG_MSK_PHY_DASH |
 186                                 CSR_HW_IF_CONFIG_REG_BIT_RADIO_SI |
 187                                 CSR_HW_IF_CONFIG_REG_BIT_MAC_SI,
 188                                 reg_val);
 189
 190         IWL_DEBUG_INFO(mvm, "Radio type=0x%x-0x%x-0x%x\n", radio_cfg_type,
 191                        radio_cfg_step, radio_cfg_dash);
 192
 193         /*
 194          * W/A : NIC is stuck in a reset state after Early PCIe power off
 195          * (PCIe power is lost before PERST# is asserted), causing ME FW
 196          * to lose ownership and not being able to obtain it back.
 197          */
 198         iwl_set_bits_mask_prph(mvm->trans, APMG_PS_CTRL_REG,
 199                                APMG_PS_CTRL_EARLY_PWR_OFF_RESET_DIS,
 200                                ~APMG_PS_CTRL_EARLY_PWR_OFF_RESET_DIS);
 201 }
 202
 203 struct iwl_rx_handlers {
 204         u8 cmd_id;
 205         bool async;
 206         int (*fn)(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 207                   struct iwl_device_cmd *cmd);
 208 };
 209
 210 #define RX_HANDLER(_cmd_id, _fn, _async)        \
 211         { .cmd_id = _cmd_id , .fn = _fn , .async = _async }
 212
 213 /*
 214  * Handlers for fw notifications
 215  * Convention: RX_HANDLER(CMD_NAME, iwl_mvm_rx_CMD_NAME
 216  * This list should be in order of frequency for performance purposes.
 217  *
 218  * The handler can be SYNC - this means that it will be called in the Rx path
 219  * which can't acquire mvm->mutex. If the handler needs to hold mvm->mutex (and
 220  * only in this case!), it should be set as ASYNC. In that case, it will be
 221  * called from a worker with mvm->mutex held.
 222  */
 223 static const struct iwl_rx_handlers iwl_mvm_rx_handlers[] = {
 224         RX_HANDLER(REPLY_RX_MPDU_CMD, iwl_mvm_rx_rx_mpdu, false),
 225         RX_HANDLER(REPLY_RX_PHY_CMD, iwl_mvm_rx_rx_phy_cmd, false),
 226         RX_HANDLER(TX_CMD, iwl_mvm_rx_tx_cmd, false),
 227         RX_HANDLER(BA_NOTIF, iwl_mvm_rx_ba_notif, false),
 228         RX_HANDLER(TIME_EVENT_NOTIFICATION, iwl_mvm_rx_time_event_notif, false),
 229
 230         RX_HANDLER(SCAN_REQUEST_CMD, iwl_mvm_rx_scan_response, false),
 231         RX_HANDLER(SCAN_COMPLETE_NOTIFICATION, iwl_mvm_rx_scan_complete, false),
 232
 233         RX_HANDLER(RADIO_VERSION_NOTIFICATION, iwl_mvm_rx_radio_ver, false),
 234         RX_HANDLER(CARD_STATE_NOTIFICATION, iwl_mvm_rx_card_state_notif, false),
 235
 236         RX_HANDLER(REPLY_ERROR, iwl_mvm_rx_fw_error, false),
 237 };
 238 #undef RX_HANDLER
 239 #define CMD(x) [x] = #x
 240
 241 static const char *iwl_mvm_cmd_strings[REPLY_MAX] = {
 242         CMD(MVM_ALIVE),
 243         CMD(REPLY_ERROR),
 244         CMD(INIT_COMPLETE_NOTIF),
 245         CMD(PHY_CONTEXT_CMD),
 246         CMD(MGMT_MCAST_KEY),
 247         CMD(TX_CMD),
 248         CMD(TXPATH_FLUSH),
 249         CMD(MAC_CONTEXT_CMD),
 250         CMD(TIME_EVENT_CMD),
 251         CMD(TIME_EVENT_NOTIFICATION),
 252         CMD(BINDING_CONTEXT_CMD),
 253         CMD(TIME_QUOTA_CMD),
 254         CMD(RADIO_VERSION_NOTIFICATION),
 255         CMD(SCAN_REQUEST_CMD),
 256         CMD(SCAN_ABORT_CMD),
 257         CMD(SCAN_START_NOTIFICATION),
 258         CMD(SCAN_RESULTS_NOTIFICATION),
 259         CMD(SCAN_COMPLETE_NOTIFICATION),
 260         CMD(NVM_ACCESS_CMD),
 261         CMD(PHY_CONFIGURATION_CMD),
 262         CMD(CALIB_RES_NOTIF_PHY_DB),
 263         CMD(SET_CALIB_DEFAULT_CMD),
 264         CMD(CALIBRATION_COMPLETE_NOTIFICATION),
 265         CMD(ADD_STA),
 266         CMD(REMOVE_STA),
 267         CMD(LQ_CMD),
 268         CMD(SCAN_OFFLOAD_CONFIG_CMD),
 269         CMD(SCAN_OFFLOAD_REQUEST_CMD),
 270         CMD(SCAN_OFFLOAD_ABORT_CMD),
 271         CMD(SCAN_OFFLOAD_COMPLETE),
 272         CMD(SCAN_OFFLOAD_UPDATE_PROFILES_CMD),
 273         CMD(POWER_TABLE_CMD),
 274         CMD(WEP_KEY),
 275         CMD(REPLY_RX_PHY_CMD),
 276         CMD(REPLY_RX_MPDU_CMD),
 277         CMD(BEACON_TEMPLATE_CMD),
 278         CMD(STATISTICS_NOTIFICATION),
 279         CMD(TX_ANT_CONFIGURATION_CMD),
 280         CMD(D3_CONFIG_CMD),
 281         CMD(PROT_OFFLOAD_CONFIG_CMD),
 282         CMD(OFFLOADS_QUERY_CMD),
 283         CMD(REMOTE_WAKE_CONFIG_CMD),
 284         CMD(WOWLAN_PATTERNS),
 285         CMD(WOWLAN_CONFIGURATION),
 286         CMD(WOWLAN_TSC_RSC_PARAM),
 287         CMD(WOWLAN_TKIP_PARAM),
 288         CMD(WOWLAN_KEK_KCK_MATERIAL),
 289         CMD(WOWLAN_GET_STATUSES),
 290         CMD(WOWLAN_TX_POWER_PER_DB),
 291         CMD(NET_DETECT_CONFIG_CMD),
 292         CMD(NET_DETECT_PROFILES_QUERY_CMD),
 293         CMD(NET_DETECT_PROFILES_CMD),
 294         CMD(NET_DETECT_HOTSPOTS_CMD),
 295         CMD(NET_DETECT_HOTSPOTS_QUERY_CMD),
 296 };
 297 #undef CMD
 298
 299 /* this forward declaration can avoid to export the function */
 300 static void iwl_mvm_async_handlers_wk(struct work_struct *wk);
 301
 302 static struct iwl_op_mode *
 303 iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
 304                       const struct iwl_fw *fw, struct dentry *dbgfs_dir)
 305 {
 306         struct ieee80211_hw *hw;
 307         struct iwl_op_mode *op_mode;
 308         struct iwl_mvm *mvm;
 309         struct iwl_trans_config trans_cfg = {};
 310         static const u8 no_reclaim_cmds[] = {
 311                 TX_CMD,
 312         };
 313         int err, scan_size;
 314
 315         switch (cfg->device_family) {
 316         case IWL_DEVICE_FAMILY_6030:
 317         case IWL_DEVICE_FAMILY_6005:
 318         case IWL_DEVICE_FAMILY_7000:
 319                 break;
 320         default:
 321                 IWL_ERR(trans, "Trying to load mvm on an unsupported device\n");
 322                 return NULL;
 323         }
 324
 325         /********************************
 326          * 1. Allocating and configuring HW data
 327          ********************************/
 328         hw = ieee80211_alloc_hw(sizeof(struct iwl_op_mode) +
 329                                 sizeof(struct iwl_mvm),
 330                                 &iwl_mvm_hw_ops);
 331         if (!hw)
 332                 return NULL;
 333
 334         op_mode = hw->priv;
 335         op_mode->ops = &iwl_mvm_ops;
 336         op_mode->trans = trans;
 337
 338         mvm = IWL_OP_MODE_GET_MVM(op_mode);
 339         mvm->dev = trans->dev;
 340         mvm->trans = trans;
 341         mvm->cfg = cfg;
 342         mvm->fw = fw;
 343         mvm->hw = hw;
 344
 345         mutex_init(&mvm->mutex);
 346         spin_lock_init(&mvm->async_handlers_lock);
 347         INIT_LIST_HEAD(&mvm->time_event_list);
 348         INIT_LIST_HEAD(&mvm->async_handlers_list);
 349         spin_lock_init(&mvm->time_event_lock);
 350
 351         INIT_WORK(&mvm->async_handlers_wk, iwl_mvm_async_handlers_wk);
 352         INIT_WORK(&mvm->roc_done_wk, iwl_mvm_roc_done_wk);
 353         INIT_WORK(&mvm->sta_drained_wk, iwl_mvm_sta_drained_wk);
 354
 355         SET_IEEE80211_DEV(mvm->hw, mvm->trans->dev);
 356
 357         /*
 358          * Populate the state variables that the transport layer needs
 359          * to know about.
 360          */
 361         trans_cfg.op_mode = op_mode;
 362         trans_cfg.no_reclaim_cmds = no_reclaim_cmds;
 363         trans_cfg.n_no_reclaim_cmds = ARRAY_SIZE(no_reclaim_cmds);
 364         trans_cfg.rx_buf_size_8k = iwlwifi_mod_params.amsdu_size_8K;
 365
 366         /* TODO: this should really be a TLV */
 367         if (cfg->device_family == IWL_DEVICE_FAMILY_7000)
 368                 trans_cfg.bc_table_dword = true;
 369
 370         if (!iwlwifi_mod_params.wd_disable)
 371                 trans_cfg.queue_watchdog_timeout = cfg->base_params->wd_timeout;
 372         else
 373                 trans_cfg.queue_watchdog_timeout = IWL_WATCHDOG_DISABLED;
 374
 375         trans_cfg.command_names = iwl_mvm_cmd_strings;
 376
 377         trans_cfg.cmd_queue = IWL_MVM_CMD_QUEUE;
 378         trans_cfg.cmd_fifo = IWL_MVM_CMD_FIFO;
 379
 380         snprintf(mvm->hw->wiphy->fw_version,
 381                  sizeof(mvm->hw->wiphy->fw_version),
 382                  "%s", fw->fw_version);
 383
 384         /* Configure transport layer */
 385         iwl_trans_configure(mvm->trans, &trans_cfg);
 386
 387         trans->rx_mpdu_cmd = REPLY_RX_MPDU_CMD;
 388         trans->rx_mpdu_cmd_hdr_size = sizeof(struct iwl_rx_mpdu_res_start);
 389
 390         /* set up notification wait support */
 391         iwl_notification_wait_init(&mvm->notif_wait);
 392
 393         /* Init phy db */
 394         mvm->phy_db = iwl_phy_db_init(trans);
 395         if (!mvm->phy_db) {
 396                 IWL_ERR(mvm, "Cannot init phy_db\n");
 397                 goto out_free;
 398         }
 399
 400         IWL_INFO(mvm, "Detected %s, REV=0x%X\n",
 401                  mvm->cfg->name, mvm->trans->hw_rev);
 402
 403         err = iwl_trans_start_hw(mvm->trans);
 404         if (err)
 405                 goto out_free;
 406
 407         mutex_lock(&mvm->mutex);
 408         err = iwl_run_init_mvm_ucode(mvm, true);
 409         mutex_unlock(&mvm->mutex);
 410         if (err && !iwlmvm_mod_params.init_dbg) {
 411                 IWL_ERR(mvm, "Failed to run INIT ucode: %d\n", err);
 412                 goto out_free;
 413         }
 414
 415         /* Stop the hw after the ALIVE and NVM has been read */
 416         if (!iwlmvm_mod_params.init_dbg)
 417                 iwl_trans_stop_hw(mvm->trans, false);
 418
 419         scan_size = sizeof(struct iwl_scan_cmd) +
 420                 mvm->fw->ucode_capa.max_probe_length +
 421                 (MAX_NUM_SCAN_CHANNELS * sizeof(struct iwl_scan_channel));
 422         mvm->scan_cmd = kmalloc(scan_size, GFP_KERNEL);
 423         if (!mvm->scan_cmd)
 424                 goto out_free;
 425
 426         err = iwl_mvm_mac_setup_register(mvm);
 427         if (err)
 428                 goto out_free;
 429
 430         err = iwl_mvm_dbgfs_register(mvm, dbgfs_dir);
 431         if (err)
 432                 goto out_unregister;
 433
 434         return op_mode;
 435
 436  out_unregister:
 437         ieee80211_unregister_hw(mvm->hw);
 438  out_free:
 439         iwl_phy_db_free(mvm->phy_db);
 440         kfree(mvm->scan_cmd);
 441         kfree(mvm->eeprom_blob);
 442         iwl_trans_stop_hw(trans, true);
 443         ieee80211_free_hw(mvm->hw);
 444         return NULL;
 445 }
 446
 447 static void iwl_op_mode_mvm_stop(struct iwl_op_mode *op_mode)
 448 {
 449         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
 450         int i;
 451
 452         iwl_mvm_leds_exit(mvm);
 453
 454         ieee80211_unregister_hw(mvm->hw);
 455
 456         kfree(mvm->scan_cmd);
 457
 458         iwl_trans_stop_hw(mvm->trans, true);
 459
 460         iwl_phy_db_free(mvm->phy_db);
 461         mvm->phy_db = NULL;
 462
 463         kfree(mvm->eeprom_blob);
 464         iwl_free_nvm_data(mvm->nvm_data);
 465         for (i = 0; i < NVM_NUM_OF_SECTIONS; i++)
 466                 kfree(mvm->nvm_sections[i].data);
 467
 468         ieee80211_free_hw(mvm->hw);
 469 }
 470
 471 struct iwl_async_handler_entry {
 472         struct list_head list;
 473         struct iwl_rx_cmd_buffer rxb;
 474         int (*fn)(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 475                   struct iwl_device_cmd *cmd);
 476 };
 477
 478 void iwl_mvm_async_handlers_purge(struct iwl_mvm *mvm)
 479 {
 480         struct iwl_async_handler_entry *entry, *tmp;
 481
 482         spin_lock_bh(&mvm->async_handlers_lock);
 483         list_for_each_entry_safe(entry, tmp, &mvm->async_handlers_list, list) {
 484                 iwl_free_rxb(&entry->rxb);
 485                 list_del(&entry->list);
 486                 kfree(entry);
 487         }
 488         spin_unlock_bh(&mvm->async_handlers_lock);
 489 }
 490
 491 static void iwl_mvm_async_handlers_wk(struct work_struct *wk)
 492 {
 493         struct iwl_mvm *mvm =
 494                 container_of(wk, struct iwl_mvm, async_handlers_wk);
 495         struct iwl_async_handler_entry *entry, *tmp;
 496         struct list_head local_list;
 497
 498         INIT_LIST_HEAD(&local_list);
 499
 500         /* Ensure that we are not in stop flow (check iwl_mvm_mac_stop) */
 501         mutex_lock(&mvm->mutex);
 502
 503         /*
 504          * Sync with Rx path with a lock. Remove all the entries from this list,
 505          * add them to a local one (lock free), and then handle them.
 506          */
 507         spin_lock_bh(&mvm->async_handlers_lock);
 508         list_splice_init(&mvm->async_handlers_list, &local_list);
 509         spin_unlock_bh(&mvm->async_handlers_lock);
 510
 511         list_for_each_entry_safe(entry, tmp, &local_list, list) {
 512                 if (entry->fn(mvm, &entry->rxb, NULL))
 513                         IWL_WARN(mvm,
 514                                  "returned value from ASYNC handlers are ignored\n");
 515                 iwl_free_rxb(&entry->rxb);
 516                 list_del(&entry->list);
 517                 kfree(entry);
 518         }
 519         mutex_unlock(&mvm->mutex);
 520 }
 521
 522 static int iwl_mvm_rx_dispatch(struct iwl_op_mode *op_mode,
 523                                struct iwl_rx_cmd_buffer *rxb,
 524                                struct iwl_device_cmd *cmd)
 525 {
 526         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 527         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
 528         u8 i;
 529
 530         /*
 531          * Do the notification wait before RX handlers so
 532          * even if the RX handler consumes the RXB we have
 533          * access to it in the notification wait entry.
 534          */
 535         iwl_notification_wait_notify(&mvm->notif_wait, pkt);
 536
 537         for (i = 0; i < ARRAY_SIZE(iwl_mvm_rx_handlers); i++) {
 538                 const struct iwl_rx_handlers *rx_h = &iwl_mvm_rx_handlers[i];
 539                 struct iwl_async_handler_entry *entry;
 540
 541                 if (rx_h->cmd_id != pkt->hdr.cmd)
 542                         continue;
 543
 544                 if (!rx_h->async)
 545                         return rx_h->fn(mvm, rxb, cmd);
 546
 547                 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
 548                 /* we can't do much... */
 549                 if (!entry)
 550                         return 0;
 551
 552                 entry->rxb._page = rxb_steal_page(rxb);
 553                 entry->rxb._offset = rxb->_offset;
 554                 entry->rxb._rx_page_order = rxb->_rx_page_order;
 555                 entry->fn = rx_h->fn;
 556                 spin_lock(&mvm->async_handlers_lock);
 557                 list_add_tail(&entry->list, &mvm->async_handlers_list);
 558                 spin_unlock(&mvm->async_handlers_lock);
 559                 schedule_work(&mvm->async_handlers_wk);
 560                 break;
 561         }
 562
 563         return 0;
 564 }
 565
 566 static void iwl_mvm_stop_sw_queue(struct iwl_op_mode *op_mode, int queue)
 567 {
 568         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
 569         int mq = mvm->queue_to_mac80211[queue];
 570
 571         if (WARN_ON_ONCE(mq == IWL_INVALID_MAC80211_QUEUE))
 572                 return;
 573
 574         if (atomic_inc_return(&mvm->queue_stop_count[mq]) > 1) {
 575                 IWL_DEBUG_TX_QUEUES(mvm,
 576                                     "queue %d (mac80211 %d) already stopped\n",
 577                                     queue, mq);
 578                 return;
 579         }
 580
 581         set_bit(mq, &mvm->transport_queue_stop);
 582         ieee80211_stop_queue(mvm->hw, mq);
 583 }
 584
 585 static void iwl_mvm_wake_sw_queue(struct iwl_op_mode *op_mode, int queue)
 586 {
 587         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
 588         int mq = mvm->queue_to_mac80211[queue];
 589
 590         if (WARN_ON_ONCE(mq == IWL_INVALID_MAC80211_QUEUE))
 591                 return;
 592
 593         if (atomic_dec_return(&mvm->queue_stop_count[mq]) > 0) {
 594                 IWL_DEBUG_TX_QUEUES(mvm,
 595                                     "queue %d (mac80211 %d) already awake\n",
 596                                     queue, mq);
 597                 return;
 598         }
 599
 600         clear_bit(mq, &mvm->transport_queue_stop);
 601
 602         ieee80211_wake_queue(mvm->hw, mq);
 603 }
 604
 605 static void iwl_mvm_set_hw_rfkill_state(struct iwl_op_mode *op_mode, bool state)
 606 {
 607         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
 608
 609         if (state)
 610                 set_bit(IWL_MVM_STATUS_HW_RFKILL, &mvm->status);
 611         else
 612                 clear_bit(IWL_MVM_STATUS_HW_RFKILL, &mvm->status);
 613
 614         wiphy_rfkill_set_hw_state(mvm->hw->wiphy, state);
 615 }
 616
 617 static void iwl_mvm_free_skb(struct iwl_op_mode *op_mode, struct sk_buff *skb)
 618 {
 619         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
 620         struct ieee80211_tx_info *info;
 621
 622         info = IEEE80211_SKB_CB(skb);
 623         iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]);
 624         ieee80211_free_txskb(mvm->hw, skb);
 625 }
 626
 627 static void iwl_mvm_nic_error(struct iwl_op_mode *op_mode)
 628 {
 629         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
 630
 631         iwl_mvm_dump_nic_error_log(mvm);
 632
 633         iwl_abort_notification_waits(&mvm->notif_wait);
 634
 635         /*
 636          * If we're restarting already, don't cycle restarts.
 637          * If INIT fw asserted, it will likely fail again.
 638          * If WoWLAN fw asserted, don't restart either, mac80211
 639          * can't recover this since we're already half suspended.
 640          */
 641         if (test_and_set_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) {
 642                 IWL_ERR(mvm, "Firmware error during reconfiguration! Abort.\n");
 643         } else if (mvm->cur_ucode == IWL_UCODE_REGULAR &&
 644                    iwlwifi_mod_params.restart_fw) {
 645                 /*
 646                  * This is a bit racy, but worst case we tell mac80211 about
 647                  * a stopped/aborted (sched) scan when that was already done
 648                  * which is not a problem. It is necessary to abort any scan
 649                  * here because mac80211 requires having the scan cleared
 650                  * before restarting.
 651                  * We'll reset the scan_status to NONE in restart cleanup in
 652                  * the next start() call from mac80211.
 653                  */
 654                 switch (mvm->scan_status) {
 655                 case IWL_MVM_SCAN_NONE:
 656                         break;
 657                 case IWL_MVM_SCAN_OS:
 658                         ieee80211_scan_completed(mvm->hw, true);
 659                         break;
 660                 }
 661
 662                 ieee80211_restart_hw(mvm->hw);
 663         }
 664 }
 665
 666 static void iwl_mvm_cmd_queue_full(struct iwl_op_mode *op_mode)
 667 {
 668         WARN_ON(1);
 669 }
 670
 671 static const struct iwl_op_mode_ops iwl_mvm_ops = {
 672         .start = iwl_op_mode_mvm_start,
 673         .stop = iwl_op_mode_mvm_stop,
 674         .rx = iwl_mvm_rx_dispatch,
 675         .queue_full = iwl_mvm_stop_sw_queue,
 676         .queue_not_full = iwl_mvm_wake_sw_queue,
 677         .hw_rf_kill = iwl_mvm_set_hw_rfkill_state,
 678         .free_skb = iwl_mvm_free_skb,
 679         .nic_error = iwl_mvm_nic_error,
 680         .cmd_queue_full = iwl_mvm_cmd_queue_full,
 681         .nic_config = iwl_mvm_nic_config,
 682 };