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 COPYING.
  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         radio_cfg_type = (mvm->fw->phy_config & FW_PHY_CFG_RADIO_TYPE) >>
 147                           FW_PHY_CFG_RADIO_TYPE_POS;
 148         radio_cfg_step = (mvm->fw->phy_config & FW_PHY_CFG_RADIO_STEP) >>
 149                           FW_PHY_CFG_RADIO_STEP_POS;
 150         radio_cfg_dash = (mvm->fw->phy_config & FW_PHY_CFG_RADIO_DASH) >>
 151                           FW_PHY_CFG_RADIO_DASH_POS;
 152
 153         /* SKU control */
 154         reg_val |= CSR_HW_REV_STEP(mvm->trans->hw_rev) <<
 155                                 CSR_HW_IF_CONFIG_REG_POS_MAC_STEP;
 156         reg_val |= CSR_HW_REV_DASH(mvm->trans->hw_rev) <<
 157                                 CSR_HW_IF_CONFIG_REG_POS_MAC_DASH;
 158
 159         /* radio configuration */
 160         reg_val |= radio_cfg_type << CSR_HW_IF_CONFIG_REG_POS_PHY_TYPE;
 161         reg_val |= radio_cfg_step << CSR_HW_IF_CONFIG_REG_POS_PHY_STEP;
 162         reg_val |= radio_cfg_dash << CSR_HW_IF_CONFIG_REG_POS_PHY_DASH;
 163
 164         WARN_ON((radio_cfg_type << CSR_HW_IF_CONFIG_REG_POS_PHY_TYPE) &
 165                  ~CSR_HW_IF_CONFIG_REG_MSK_PHY_TYPE);
 166
 167         /* silicon bits */
 168         reg_val |= CSR_HW_IF_CONFIG_REG_BIT_RADIO_SI;
 169
 170         iwl_trans_set_bits_mask(mvm->trans, CSR_HW_IF_CONFIG_REG,
 171                                 CSR_HW_IF_CONFIG_REG_MSK_MAC_DASH |
 172                                 CSR_HW_IF_CONFIG_REG_MSK_MAC_STEP |
 173                                 CSR_HW_IF_CONFIG_REG_MSK_PHY_TYPE |
 174                                 CSR_HW_IF_CONFIG_REG_MSK_PHY_STEP |
 175                                 CSR_HW_IF_CONFIG_REG_MSK_PHY_DASH |
 176                                 CSR_HW_IF_CONFIG_REG_BIT_RADIO_SI |
 177                                 CSR_HW_IF_CONFIG_REG_BIT_MAC_SI,
 178                                 reg_val);
 179
 180         IWL_DEBUG_INFO(mvm, "Radio type=0x%x-0x%x-0x%x\n", radio_cfg_type,
 181                        radio_cfg_step, radio_cfg_dash);
 182
 183         /*
 184          * W/A : NIC is stuck in a reset state after Early PCIe power off
 185          * (PCIe power is lost before PERST# is asserted), causing ME FW
 186          * to lose ownership and not being able to obtain it back.
 187          */
 188         iwl_set_bits_mask_prph(mvm->trans, APMG_PS_CTRL_REG,
 189                                APMG_PS_CTRL_EARLY_PWR_OFF_RESET_DIS,
 190                                ~APMG_PS_CTRL_EARLY_PWR_OFF_RESET_DIS);
 191 }
 192
 193 struct iwl_rx_handlers {
 194         u8 cmd_id;
 195         bool async;
 196         int (*fn)(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 197                   struct iwl_device_cmd *cmd);
 198 };
 199
 200 #define RX_HANDLER(_cmd_id, _fn, _async)        \
 201         { .cmd_id = _cmd_id , .fn = _fn , .async = _async }
 202
 203 /*
 204  * Handlers for fw notifications
 205  * Convention: RX_HANDLER(CMD_NAME, iwl_mvm_rx_CMD_NAME
 206  * This list should be in order of frequency for performance purposes.
 207  *
 208  * The handler can be SYNC - this means that it will be called in the Rx path
 209  * which can't acquire mvm->mutex. If the handler needs to hold mvm->mutex (and
 210  * only in this case!), it should be set as ASYNC. In that case, it will be
 211  * called from a worker with mvm->mutex held.
 212  */
 213 static const struct iwl_rx_handlers iwl_mvm_rx_handlers[] = {
 214         RX_HANDLER(REPLY_RX_MPDU_CMD, iwl_mvm_rx_rx_mpdu, false),
 215         RX_HANDLER(REPLY_RX_PHY_CMD, iwl_mvm_rx_rx_phy_cmd, false),
 216         RX_HANDLER(TX_CMD, iwl_mvm_rx_tx_cmd, false),
 217         RX_HANDLER(BA_NOTIF, iwl_mvm_rx_ba_notif, false),
 218         RX_HANDLER(TIME_EVENT_NOTIFICATION, iwl_mvm_rx_time_event_notif, false),
 219
 220         RX_HANDLER(SCAN_REQUEST_CMD, iwl_mvm_rx_scan_response, false),
 221         RX_HANDLER(SCAN_COMPLETE_NOTIFICATION, iwl_mvm_rx_scan_complete, false),
 222
 223         RX_HANDLER(BT_PROFILE_NOTIFICATION, iwl_mvm_rx_bt_coex_notif, true),
 224         RX_HANDLER(BEACON_NOTIFICATION, iwl_mvm_rx_beacon_notif, false),
 225
 226         RX_HANDLER(RADIO_VERSION_NOTIFICATION, iwl_mvm_rx_radio_ver, false),
 227         RX_HANDLER(CARD_STATE_NOTIFICATION, iwl_mvm_rx_card_state_notif, false),
 228
 229         RX_HANDLER(REPLY_ERROR, iwl_mvm_rx_fw_error, false),
 230 };
 231 #undef RX_HANDLER
 232 #define CMD(x) [x] = #x
 233
 234 static const char *iwl_mvm_cmd_strings[REPLY_MAX] = {
 235         CMD(MVM_ALIVE),
 236         CMD(REPLY_ERROR),
 237         CMD(INIT_COMPLETE_NOTIF),
 238         CMD(PHY_CONTEXT_CMD),
 239         CMD(MGMT_MCAST_KEY),
 240         CMD(TX_CMD),
 241         CMD(TXPATH_FLUSH),
 242         CMD(MAC_CONTEXT_CMD),
 243         CMD(TIME_EVENT_CMD),
 244         CMD(TIME_EVENT_NOTIFICATION),
 245         CMD(BINDING_CONTEXT_CMD),
 246         CMD(TIME_QUOTA_CMD),
 247         CMD(RADIO_VERSION_NOTIFICATION),
 248         CMD(SCAN_REQUEST_CMD),
 249         CMD(SCAN_ABORT_CMD),
 250         CMD(SCAN_START_NOTIFICATION),
 251         CMD(SCAN_RESULTS_NOTIFICATION),
 252         CMD(SCAN_COMPLETE_NOTIFICATION),
 253         CMD(NVM_ACCESS_CMD),
 254         CMD(PHY_CONFIGURATION_CMD),
 255         CMD(CALIB_RES_NOTIF_PHY_DB),
 256         CMD(SET_CALIB_DEFAULT_CMD),
 257         CMD(CALIBRATION_COMPLETE_NOTIFICATION),
 258         CMD(ADD_STA),
 259         CMD(REMOVE_STA),
 260         CMD(LQ_CMD),
 261         CMD(SCAN_OFFLOAD_CONFIG_CMD),
 262         CMD(SCAN_OFFLOAD_REQUEST_CMD),
 263         CMD(SCAN_OFFLOAD_ABORT_CMD),
 264         CMD(SCAN_OFFLOAD_COMPLETE),
 265         CMD(SCAN_OFFLOAD_UPDATE_PROFILES_CMD),
 266         CMD(POWER_TABLE_CMD),
 267         CMD(WEP_KEY),
 268         CMD(REPLY_RX_PHY_CMD),
 269         CMD(REPLY_RX_MPDU_CMD),
 270         CMD(BEACON_NOTIFICATION),
 271         CMD(BEACON_TEMPLATE_CMD),
 272         CMD(STATISTICS_NOTIFICATION),
 273         CMD(TX_ANT_CONFIGURATION_CMD),
 274         CMD(D3_CONFIG_CMD),
 275         CMD(PROT_OFFLOAD_CONFIG_CMD),
 276         CMD(OFFLOADS_QUERY_CMD),
 277         CMD(REMOTE_WAKE_CONFIG_CMD),
 278         CMD(WOWLAN_PATTERNS),
 279         CMD(WOWLAN_CONFIGURATION),
 280         CMD(WOWLAN_TSC_RSC_PARAM),
 281         CMD(WOWLAN_TKIP_PARAM),
 282         CMD(WOWLAN_KEK_KCK_MATERIAL),
 283         CMD(WOWLAN_GET_STATUSES),
 284         CMD(WOWLAN_TX_POWER_PER_DB),
 285         CMD(NET_DETECT_CONFIG_CMD),
 286         CMD(NET_DETECT_PROFILES_QUERY_CMD),
 287         CMD(NET_DETECT_PROFILES_CMD),
 288         CMD(NET_DETECT_HOTSPOTS_CMD),
 289         CMD(NET_DETECT_HOTSPOTS_QUERY_CMD),
 290         CMD(CARD_STATE_NOTIFICATION),
 291         CMD(BT_COEX_PRIO_TABLE),
 292         CMD(BT_COEX_PROT_ENV),
 293         CMD(BT_PROFILE_NOTIFICATION),
 294         CMD(BT_CONFIG),
 295         CMD(MCAST_FILTER_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         /********************************
 316          * 1. Allocating and configuring HW data
 317          ********************************/
 318         hw = ieee80211_alloc_hw(sizeof(struct iwl_op_mode) +
 319                                 sizeof(struct iwl_mvm),
 320                                 &iwl_mvm_hw_ops);
 321         if (!hw)
 322                 return NULL;
 323
 324         op_mode = hw->priv;
 325         op_mode->ops = &iwl_mvm_ops;
 326         op_mode->trans = trans;
 327
 328         mvm = IWL_OP_MODE_GET_MVM(op_mode);
 329         mvm->dev = trans->dev;
 330         mvm->trans = trans;
 331         mvm->cfg = cfg;
 332         mvm->fw = fw;
 333         mvm->hw = hw;
 334
 335         mutex_init(&mvm->mutex);
 336         spin_lock_init(&mvm->async_handlers_lock);
 337         INIT_LIST_HEAD(&mvm->time_event_list);
 338         INIT_LIST_HEAD(&mvm->async_handlers_list);
 339         spin_lock_init(&mvm->time_event_lock);
 340
 341         INIT_WORK(&mvm->async_handlers_wk, iwl_mvm_async_handlers_wk);
 342         INIT_WORK(&mvm->roc_done_wk, iwl_mvm_roc_done_wk);
 343         INIT_WORK(&mvm->sta_drained_wk, iwl_mvm_sta_drained_wk);
 344
 345         SET_IEEE80211_DEV(mvm->hw, mvm->trans->dev);
 346
 347         /*
 348          * Populate the state variables that the transport layer needs
 349          * to know about.
 350          */
 351         trans_cfg.op_mode = op_mode;
 352         trans_cfg.no_reclaim_cmds = no_reclaim_cmds;
 353         trans_cfg.n_no_reclaim_cmds = ARRAY_SIZE(no_reclaim_cmds);
 354         trans_cfg.rx_buf_size_8k = iwlwifi_mod_params.amsdu_size_8K;
 355
 356         if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_DW_BC_TABLE)
 357                 trans_cfg.bc_table_dword = true;
 358
 359         if (!iwlwifi_mod_params.wd_disable)
 360                 trans_cfg.queue_watchdog_timeout = cfg->base_params->wd_timeout;
 361         else
 362                 trans_cfg.queue_watchdog_timeout = IWL_WATCHDOG_DISABLED;
 363
 364         trans_cfg.command_names = iwl_mvm_cmd_strings;
 365
 366         trans_cfg.cmd_queue = IWL_MVM_CMD_QUEUE;
 367         trans_cfg.cmd_fifo = IWL_MVM_CMD_FIFO;
 368
 369         snprintf(mvm->hw->wiphy->fw_version,
 370                  sizeof(mvm->hw->wiphy->fw_version),
 371                  "%s", fw->fw_version);
 372
 373         /* Configure transport layer */
 374         iwl_trans_configure(mvm->trans, &trans_cfg);
 375
 376         trans->rx_mpdu_cmd = REPLY_RX_MPDU_CMD;
 377         trans->rx_mpdu_cmd_hdr_size = sizeof(struct iwl_rx_mpdu_res_start);
 378
 379         /* set up notification wait support */
 380         iwl_notification_wait_init(&mvm->notif_wait);
 381
 382         /* Init phy db */
 383         mvm->phy_db = iwl_phy_db_init(trans);
 384         if (!mvm->phy_db) {
 385                 IWL_ERR(mvm, "Cannot init phy_db\n");
 386                 goto out_free;
 387         }
 388
 389         IWL_INFO(mvm, "Detected %s, REV=0x%X\n",
 390                  mvm->cfg->name, mvm->trans->hw_rev);
 391
 392         err = iwl_trans_start_hw(mvm->trans);
 393         if (err)
 394                 goto out_free;
 395
 396         mutex_lock(&mvm->mutex);
 397         err = iwl_run_init_mvm_ucode(mvm, true);
 398         mutex_unlock(&mvm->mutex);
 399         if (err && !iwlmvm_mod_params.init_dbg) {
 400                 IWL_ERR(mvm, "Failed to run INIT ucode: %d\n", err);
 401                 goto out_free;
 402         }
 403
 404         /* Stop the hw after the ALIVE and NVM has been read */
 405         if (!iwlmvm_mod_params.init_dbg)
 406                 iwl_trans_stop_hw(mvm->trans, false);
 407
 408         scan_size = sizeof(struct iwl_scan_cmd) +
 409                 mvm->fw->ucode_capa.max_probe_length +
 410                 (MAX_NUM_SCAN_CHANNELS * sizeof(struct iwl_scan_channel));
 411         mvm->scan_cmd = kmalloc(scan_size, GFP_KERNEL);
 412         if (!mvm->scan_cmd)
 413                 goto out_free;
 414
 415         err = iwl_mvm_mac_setup_register(mvm);
 416         if (err)
 417                 goto out_free;
 418
 419         err = iwl_mvm_dbgfs_register(mvm, dbgfs_dir);
 420         if (err)
 421                 goto out_unregister;
 422
 423         return op_mode;
 424
 425  out_unregister:
 426         ieee80211_unregister_hw(mvm->hw);
 427  out_free:
 428         iwl_phy_db_free(mvm->phy_db);
 429         kfree(mvm->scan_cmd);
 430         iwl_trans_stop_hw(trans, true);
 431         ieee80211_free_hw(mvm->hw);
 432         return NULL;
 433 }
 434
 435 static void iwl_op_mode_mvm_stop(struct iwl_op_mode *op_mode)
 436 {
 437         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
 438         int i;
 439
 440         iwl_mvm_leds_exit(mvm);
 441
 442         ieee80211_unregister_hw(mvm->hw);
 443
 444         kfree(mvm->scan_cmd);
 445
 446         iwl_trans_stop_hw(mvm->trans, true);
 447
 448         iwl_phy_db_free(mvm->phy_db);
 449         mvm->phy_db = NULL;
 450
 451         iwl_free_nvm_data(mvm->nvm_data);
 452         for (i = 0; i < NVM_NUM_OF_SECTIONS; i++)
 453                 kfree(mvm->nvm_sections[i].data);
 454
 455         ieee80211_free_hw(mvm->hw);
 456 }
 457
 458 struct iwl_async_handler_entry {
 459         struct list_head list;
 460         struct iwl_rx_cmd_buffer rxb;
 461         int (*fn)(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 462                   struct iwl_device_cmd *cmd);
 463 };
 464
 465 void iwl_mvm_async_handlers_purge(struct iwl_mvm *mvm)
 466 {
 467         struct iwl_async_handler_entry *entry, *tmp;
 468
 469         spin_lock_bh(&mvm->async_handlers_lock);
 470         list_for_each_entry_safe(entry, tmp, &mvm->async_handlers_list, list) {
 471                 iwl_free_rxb(&entry->rxb);
 472                 list_del(&entry->list);
 473                 kfree(entry);
 474         }
 475         spin_unlock_bh(&mvm->async_handlers_lock);
 476 }
 477
 478 static void iwl_mvm_async_handlers_wk(struct work_struct *wk)
 479 {
 480         struct iwl_mvm *mvm =
 481                 container_of(wk, struct iwl_mvm, async_handlers_wk);
 482         struct iwl_async_handler_entry *entry, *tmp;
 483         struct list_head local_list;
 484
 485         INIT_LIST_HEAD(&local_list);
 486
 487         /* Ensure that we are not in stop flow (check iwl_mvm_mac_stop) */
 488         mutex_lock(&mvm->mutex);
 489
 490         /*
 491          * Sync with Rx path with a lock. Remove all the entries from this list,
 492          * add them to a local one (lock free), and then handle them.
 493          */
 494         spin_lock_bh(&mvm->async_handlers_lock);
 495         list_splice_init(&mvm->async_handlers_list, &local_list);
 496         spin_unlock_bh(&mvm->async_handlers_lock);
 497
 498         list_for_each_entry_safe(entry, tmp, &local_list, list) {
 499                 if (entry->fn(mvm, &entry->rxb, NULL))
 500                         IWL_WARN(mvm,
 501                                  "returned value from ASYNC handlers are ignored\n");
 502                 iwl_free_rxb(&entry->rxb);
 503                 list_del(&entry->list);
 504                 kfree(entry);
 505         }
 506         mutex_unlock(&mvm->mutex);
 507 }
 508
 509 static int iwl_mvm_rx_dispatch(struct iwl_op_mode *op_mode,
 510                                struct iwl_rx_cmd_buffer *rxb,
 511                                struct iwl_device_cmd *cmd)
 512 {
 513         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 514         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
 515         u8 i;
 516
 517         /*
 518          * Do the notification wait before RX handlers so
 519          * even if the RX handler consumes the RXB we have
 520          * access to it in the notification wait entry.
 521          */
 522         iwl_notification_wait_notify(&mvm->notif_wait, pkt);
 523
 524         for (i = 0; i < ARRAY_SIZE(iwl_mvm_rx_handlers); i++) {
 525                 const struct iwl_rx_handlers *rx_h = &iwl_mvm_rx_handlers[i];
 526                 struct iwl_async_handler_entry *entry;
 527
 528                 if (rx_h->cmd_id != pkt->hdr.cmd)
 529                         continue;
 530
 531                 if (!rx_h->async)
 532                         return rx_h->fn(mvm, rxb, cmd);
 533
 534                 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
 535                 /* we can't do much... */
 536                 if (!entry)
 537                         return 0;
 538
 539                 entry->rxb._page = rxb_steal_page(rxb);
 540                 entry->rxb._offset = rxb->_offset;
 541                 entry->rxb._rx_page_order = rxb->_rx_page_order;
 542                 entry->fn = rx_h->fn;
 543                 spin_lock(&mvm->async_handlers_lock);
 544                 list_add_tail(&entry->list, &mvm->async_handlers_list);
 545                 spin_unlock(&mvm->async_handlers_lock);
 546                 schedule_work(&mvm->async_handlers_wk);
 547                 break;
 548         }
 549
 550         return 0;
 551 }
 552
 553 static void iwl_mvm_stop_sw_queue(struct iwl_op_mode *op_mode, int queue)
 554 {
 555         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
 556         int mq = mvm->queue_to_mac80211[queue];
 557
 558         if (WARN_ON_ONCE(mq == IWL_INVALID_MAC80211_QUEUE))
 559                 return;
 560
 561         if (atomic_inc_return(&mvm->queue_stop_count[mq]) > 1) {
 562                 IWL_DEBUG_TX_QUEUES(mvm,
 563                                     "queue %d (mac80211 %d) already stopped\n",
 564                                     queue, mq);
 565                 return;
 566         }
 567
 568         set_bit(mq, &mvm->transport_queue_stop);
 569         ieee80211_stop_queue(mvm->hw, mq);
 570 }
 571
 572 static void iwl_mvm_wake_sw_queue(struct iwl_op_mode *op_mode, int queue)
 573 {
 574         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
 575         int mq = mvm->queue_to_mac80211[queue];
 576
 577         if (WARN_ON_ONCE(mq == IWL_INVALID_MAC80211_QUEUE))
 578                 return;
 579
 580         if (atomic_dec_return(&mvm->queue_stop_count[mq]) > 0) {
 581                 IWL_DEBUG_TX_QUEUES(mvm,
 582                                     "queue %d (mac80211 %d) already awake\n",
 583                                     queue, mq);
 584                 return;
 585         }
 586
 587         clear_bit(mq, &mvm->transport_queue_stop);
 588
 589         ieee80211_wake_queue(mvm->hw, mq);
 590 }
 591
 592 static void iwl_mvm_set_hw_rfkill_state(struct iwl_op_mode *op_mode, bool state)
 593 {
 594         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
 595
 596         if (state)
 597                 set_bit(IWL_MVM_STATUS_HW_RFKILL, &mvm->status);
 598         else
 599                 clear_bit(IWL_MVM_STATUS_HW_RFKILL, &mvm->status);
 600
 601         wiphy_rfkill_set_hw_state(mvm->hw->wiphy, state);
 602 }
 603
 604 static void iwl_mvm_free_skb(struct iwl_op_mode *op_mode, struct sk_buff *skb)
 605 {
 606         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
 607         struct ieee80211_tx_info *info;
 608
 609         info = IEEE80211_SKB_CB(skb);
 610         iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]);
 611         ieee80211_free_txskb(mvm->hw, skb);
 612 }
 613
 614 static void iwl_mvm_nic_restart(struct iwl_mvm *mvm)
 615 {
 616         iwl_abort_notification_waits(&mvm->notif_wait);
 617
 618         /*
 619          * If we're restarting already, don't cycle restarts.
 620          * If INIT fw asserted, it will likely fail again.
 621          * If WoWLAN fw asserted, don't restart either, mac80211
 622          * can't recover this since we're already half suspended.
 623          */
 624         if (test_and_set_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) {
 625                 IWL_ERR(mvm, "Firmware error during reconfiguration! Abort.\n");
 626         } else if (mvm->cur_ucode == IWL_UCODE_REGULAR &&
 627                    iwlwifi_mod_params.restart_fw) {
 628                 /*
 629                  * This is a bit racy, but worst case we tell mac80211 about
 630                  * a stopped/aborted (sched) scan when that was already done
 631                  * which is not a problem. It is necessary to abort any scan
 632                  * here because mac80211 requires having the scan cleared
 633                  * before restarting.
 634                  * We'll reset the scan_status to NONE in restart cleanup in
 635                  * the next start() call from mac80211.
 636                  */
 637                 switch (mvm->scan_status) {
 638                 case IWL_MVM_SCAN_NONE:
 639                         break;
 640                 case IWL_MVM_SCAN_OS:
 641                         ieee80211_scan_completed(mvm->hw, true);
 642                         break;
 643                 }
 644
 645                 ieee80211_restart_hw(mvm->hw);
 646         }
 647 }
 648
 649 static void iwl_mvm_nic_error(struct iwl_op_mode *op_mode)
 650 {
 651         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
 652
 653         iwl_mvm_dump_nic_error_log(mvm);
 654
 655         iwl_mvm_nic_restart(mvm);
 656 }
 657
 658 static void iwl_mvm_cmd_queue_full(struct iwl_op_mode *op_mode)
 659 {
 660         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
 661
 662         WARN_ON(1);
 663         iwl_mvm_nic_restart(mvm);
 664 }
 665
 666 static const struct iwl_op_mode_ops iwl_mvm_ops = {
 667         .start = iwl_op_mode_mvm_start,
 668         .stop = iwl_op_mode_mvm_stop,
 669         .rx = iwl_mvm_rx_dispatch,
 670         .queue_full = iwl_mvm_stop_sw_queue,
 671         .queue_not_full = iwl_mvm_wake_sw_queue,
 672         .hw_rf_kill = iwl_mvm_set_hw_rfkill_state,
 673         .free_skb = iwl_mvm_free_skb,
 674         .nic_error = iwl_mvm_nic_error,
 675         .cmd_queue_full = iwl_mvm_cmd_queue_full,
 676         .nic_config = iwl_mvm_nic_config,
 677 };