iwlwifi: move under intel vendor directory

Part of reorganising wireless drivers directory and Kconfig.

Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

1 files changed, 872 insertions, 0 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/time-event.c b/drivers/net/wireless/intel/iwlwifi/mvm/time-event.c
new file mode 100644
index 000000000000..7530eb23035d
--- /dev/null
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/time-event.c
@@ -0,0 +1,872 @@
+/******************************************************************************
+ *
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
+ * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
+ * USA
+ *
+ * The full GNU General Public License is included in this distribution
+ * in the file called COPYING.
+ *
+ * Contact Information:
+ *  Intel Linux Wireless <ilw@linux.intel.com>
+ * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
+ * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *  * Neither the name Intel Corporation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *****************************************************************************/
+
+#include <linux/jiffies.h>
+#include <net/mac80211.h>
+
+#include "iwl-notif-wait.h"
+#include "iwl-trans.h"
+#include "fw-api.h"
+#include "time-event.h"
+#include "mvm.h"
+#include "iwl-io.h"
+#include "iwl-prph.h"
+
+/*
+ * For the high priority TE use a time event type that has similar priority to
+ * the FW's action scan priority.
+ */
+#define IWL_MVM_ROC_TE_TYPE_NORMAL TE_P2P_DEVICE_DISCOVERABLE
+#define IWL_MVM_ROC_TE_TYPE_MGMT_TX TE_P2P_CLIENT_ASSOC
+
+void iwl_mvm_te_clear_data(struct iwl_mvm *mvm,
+                           struct iwl_mvm_time_event_data *te_data)
+{
+        lockdep_assert_held(&mvm->time_event_lock);
+
+        if (!te_data->vif)
+                return;
+
+        list_del(&te_data->list);
+        te_data->running = false;
+        te_data->uid = 0;
+        te_data->id = TE_MAX;
+        te_data->vif = NULL;
+}
+
+void iwl_mvm_roc_done_wk(struct work_struct *wk)
+{
+        struct iwl_mvm *mvm = container_of(wk, struct iwl_mvm, roc_done_wk);
+        u32 queues = 0;
+
+        /*
+         * Clear the ROC_RUNNING /ROC_AUX_RUNNING status bit.
+         * This will cause the TX path to drop offchannel transmissions.
+         * That would also be done by mac80211, but it is racy, in particular
+         * in the case that the time event actually completed in the firmware
+         * (which is handled in iwl_mvm_te_handle_notif).
+         */
+        if (test_and_clear_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status)) {
+                queues |= BIT(IWL_MVM_OFFCHANNEL_QUEUE);
+                iwl_mvm_unref(mvm, IWL_MVM_REF_ROC);
+        }
+        if (test_and_clear_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status)) {
+                queues |= BIT(mvm->aux_queue);
+                iwl_mvm_unref(mvm, IWL_MVM_REF_ROC_AUX);
+        }
+
+        synchronize_net();
+
+        /*
+         * Flush the offchannel queue -- this is called when the time
+         * event finishes or is canceled, so that frames queued for it
+         * won't get stuck on the queue and be transmitted in the next
+         * time event.
+         * We have to send the command asynchronously since this cannot
+         * be under the mutex for locking reasons, but that's not an
+         * issue as it will have to complete before the next command is
+         * executed, and a new time event means a new command.
+         */
+        iwl_mvm_flush_tx_path(mvm, queues, CMD_ASYNC);
+}
+
+static void iwl_mvm_roc_finished(struct iwl_mvm *mvm)
+{
+        /*
+         * Of course, our status bit is just as racy as mac80211, so in
+         * addition, fire off the work struct which will drop all frames
+         * from the hardware queues that made it through the race. First
+         * it will of course synchronize the TX path to make sure that
+         * any *new* TX will be rejected.
+         */
+        schedule_work(&mvm->roc_done_wk);
+}
+
+static void iwl_mvm_csa_noa_start(struct iwl_mvm *mvm)
+{
+        struct ieee80211_vif *csa_vif;
+
+        rcu_read_lock();
+
+        csa_vif = rcu_dereference(mvm->csa_vif);
+        if (!csa_vif || !csa_vif->csa_active)
+                goto out_unlock;
+
+        IWL_DEBUG_TE(mvm, "CSA NOA started\n");
+
+        /*
+         * CSA NoA is started but we still have beacons to
+         * transmit on the current channel.
+         * So we just do nothing here and the switch
+         * will be performed on the last TBTT.
+         */
+        if (!ieee80211_csa_is_complete(csa_vif)) {
+                IWL_WARN(mvm, "CSA NOA started too early\n");
+                goto out_unlock;
+        }
+
+        ieee80211_csa_finish(csa_vif);
+
+        rcu_read_unlock();
+
+        RCU_INIT_POINTER(mvm->csa_vif, NULL);
+
+        return;
+
+out_unlock:
+        rcu_read_unlock();
+}
+
+static bool iwl_mvm_te_check_disconnect(struct iwl_mvm *mvm,
+                                        struct ieee80211_vif *vif,
+                                        const char *errmsg)
+{
+        if (vif->type != NL80211_IFTYPE_STATION)
+                return false;
+        if (vif->bss_conf.assoc && vif->bss_conf.dtim_period)
+                return false;
+        if (errmsg)
+                IWL_ERR(mvm, "%s\n", errmsg);
+
+        iwl_mvm_connection_loss(mvm, vif, errmsg);
+        return true;
+}
+
+static void
+iwl_mvm_te_handle_notify_csa(struct iwl_mvm *mvm,
+                             struct iwl_mvm_time_event_data *te_data,
+                             struct iwl_time_event_notif *notif)
+{
+        struct ieee80211_vif *vif = te_data->vif;
+        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
+
+        if (!notif->status)
+                IWL_DEBUG_TE(mvm, "CSA time event failed to start\n");
+
+        switch (te_data->vif->type) {
+        case NL80211_IFTYPE_AP:
+                if (!notif->status)
+                        mvmvif->csa_failed = true;
+                iwl_mvm_csa_noa_start(mvm);
+                break;
+        case NL80211_IFTYPE_STATION:
+                if (!notif->status) {
+                        iwl_mvm_connection_loss(mvm, vif,
+                                                "CSA TE failed to start");
+                        break;
+                }
+                iwl_mvm_csa_client_absent(mvm, te_data->vif);
+                ieee80211_chswitch_done(te_data->vif, true);
+                break;
+        default:
+                /* should never happen */
+                WARN_ON_ONCE(1);
+                break;
+        }
+
+        /* we don't need it anymore */
+        iwl_mvm_te_clear_data(mvm, te_data);
+}
+
+static void iwl_mvm_te_check_trigger(struct iwl_mvm *mvm,
+                                     struct iwl_time_event_notif *notif,
+                                     struct iwl_mvm_time_event_data *te_data)
+{
+        struct iwl_fw_dbg_trigger_tlv *trig;
+        struct iwl_fw_dbg_trigger_time_event *te_trig;
+        int i;
+
+        if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_TIME_EVENT))
+                return;
+
+        trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_TIME_EVENT);
+        te_trig = (void *)trig->data;
+
+        if (!iwl_fw_dbg_trigger_check_stop(mvm, te_data->vif, trig))
+                return;
+
+        for (i = 0; i < ARRAY_SIZE(te_trig->time_events); i++) {
+                u32 trig_te_id = le32_to_cpu(te_trig->time_events[i].id);
+                u32 trig_action_bitmap =
+                        le32_to_cpu(te_trig->time_events[i].action_bitmap);
+                u32 trig_status_bitmap =
+                        le32_to_cpu(te_trig->time_events[i].status_bitmap);
+
+                if (trig_te_id != te_data->id ||
+                    !(trig_action_bitmap & le32_to_cpu(notif->action)) ||
+                    !(trig_status_bitmap & BIT(le32_to_cpu(notif->status))))
+                        continue;
+
+                iwl_mvm_fw_dbg_collect_trig(mvm, trig,
+                                            "Time event %d Action 0x%x received status: %d",
+                                            te_data->id,
+                                            le32_to_cpu(notif->action),
+                                            le32_to_cpu(notif->status));
+                break;
+        }
+}
+
+/*
+ * Handles a FW notification for an event that is known to the driver.
+ *
+ * @mvm: the mvm component
+ * @te_data: the time event data
+ * @notif: the notification data corresponding the time event data.
+ */
+static void iwl_mvm_te_handle_notif(struct iwl_mvm *mvm,
+                                    struct iwl_mvm_time_event_data *te_data,
+                                    struct iwl_time_event_notif *notif)
+{
+        lockdep_assert_held(&mvm->time_event_lock);
+
+        IWL_DEBUG_TE(mvm, "Handle time event notif - UID = 0x%x action %d\n",
+                     le32_to_cpu(notif->unique_id),
+                     le32_to_cpu(notif->action));
+
+        iwl_mvm_te_check_trigger(mvm, notif, te_data);
+
+        /*
+         * The FW sends the start/end time event notifications even for events
+         * that it fails to schedule. This is indicated in the status field of
+         * the notification. This happens in cases that the scheduler cannot
+         * find a schedule that can handle the event (for example requesting a
+         * P2P Device discoveribility, while there are other higher priority
+         * events in the system).
+         */
+        if (!le32_to_cpu(notif->status)) {
+                const char *msg;
+
+                if (notif->action & cpu_to_le32(TE_V2_NOTIF_HOST_EVENT_START))
+                        msg = "Time Event start notification failure";
+                else
+                        msg = "Time Event end notification failure";
+
+                IWL_DEBUG_TE(mvm, "%s\n", msg);
+
+                if (iwl_mvm_te_check_disconnect(mvm, te_data->vif, msg)) {
+                        iwl_mvm_te_clear_data(mvm, te_data);
+                        return;
+                }
+        }
+
+        if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_END) {
+                IWL_DEBUG_TE(mvm,
+                             "TE ended - current time %lu, estimated end %lu\n",
+                             jiffies, te_data->end_jiffies);
+
+                switch (te_data->vif->type) {
+                case NL80211_IFTYPE_P2P_DEVICE:
+                        ieee80211_remain_on_channel_expired(mvm->hw);
+                        iwl_mvm_roc_finished(mvm);
+                        break;
+                case NL80211_IFTYPE_STATION:
+                        /*
+                         * By now, we should have finished association
+                         * and know the dtim period.
+                         */
+                        iwl_mvm_te_check_disconnect(mvm, te_data->vif,
+                                "No association and the time event is over already...");
+                        break;
+                default:
+                        break;
+                }
+
+                iwl_mvm_te_clear_data(mvm, te_data);
+        } else if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_START) {
+                te_data->running = true;
+                te_data->end_jiffies = TU_TO_EXP_TIME(te_data->duration);
+
+                if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
+                        set_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status);
+                        iwl_mvm_ref(mvm, IWL_MVM_REF_ROC);
+                        ieee80211_ready_on_channel(mvm->hw);
+                } else if (te_data->id == TE_CHANNEL_SWITCH_PERIOD) {
+                        iwl_mvm_te_handle_notify_csa(mvm, te_data, notif);
+                }
+        } else {
+                IWL_WARN(mvm, "Got TE with unknown action\n");
+        }
+}
+
+/*
+ * Handle A Aux ROC time event
+ */
+static int iwl_mvm_aux_roc_te_handle_notif(struct iwl_mvm *mvm,
+                                           struct iwl_time_event_notif *notif)
+{
+        struct iwl_mvm_time_event_data *te_data, *tmp;
+        bool aux_roc_te = false;
+
+        list_for_each_entry_safe(te_data, tmp, &mvm->aux_roc_te_list, list) {
+                if (le32_to_cpu(notif->unique_id) == te_data->uid) {
+                        aux_roc_te = true;
+                        break;
+                }
+        }
+        if (!aux_roc_te) /* Not a Aux ROC time event */
+                return -EINVAL;
+
+        iwl_mvm_te_check_trigger(mvm, notif, te_data);
+
+        if (!le32_to_cpu(notif->status)) {
+                IWL_DEBUG_TE(mvm,
+                             "ERROR: Aux ROC Time Event %s notification failure\n",
+                             (le32_to_cpu(notif->action) &
+                              TE_V2_NOTIF_HOST_EVENT_START) ? "start" : "end");
+                return -EINVAL;
+        }
+
+        IWL_DEBUG_TE(mvm,
+                     "Aux ROC time event notification  - UID = 0x%x action %d\n",
+                     le32_to_cpu(notif->unique_id),
+                     le32_to_cpu(notif->action));
+
+        if (le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_END) {
+                /* End TE, notify mac80211 */
+                ieee80211_remain_on_channel_expired(mvm->hw);
+                iwl_mvm_roc_finished(mvm); /* flush aux queue */
+                list_del(&te_data->list); /* remove from list */
+                te_data->running = false;
+                te_data->vif = NULL;
+                te_data->uid = 0;
+                te_data->id = TE_MAX;
+        } else if (le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_START) {
+                set_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status);
+                te_data->running = true;
+                iwl_mvm_ref(mvm, IWL_MVM_REF_ROC_AUX);
+                ieee80211_ready_on_channel(mvm->hw); /* Start TE */
+        } else {
+                IWL_DEBUG_TE(mvm,
+                             "ERROR: Unknown Aux ROC Time Event (action = %d)\n",
+                             le32_to_cpu(notif->action));
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+/*
+ * The Rx handler for time event notifications
+ */
+void iwl_mvm_rx_time_event_notif(struct iwl_mvm *mvm,
+                                 struct iwl_rx_cmd_buffer *rxb)
+{
+        struct iwl_rx_packet *pkt = rxb_addr(rxb);
+        struct iwl_time_event_notif *notif = (void *)pkt->data;
+        struct iwl_mvm_time_event_data *te_data, *tmp;
+
+        IWL_DEBUG_TE(mvm, "Time event notification - UID = 0x%x action %d\n",
+                     le32_to_cpu(notif->unique_id),
+                     le32_to_cpu(notif->action));
+
+        spin_lock_bh(&mvm->time_event_lock);
+        /* This time event is triggered for Aux ROC request */
+        if (!iwl_mvm_aux_roc_te_handle_notif(mvm, notif))
+                goto unlock;
+
+        list_for_each_entry_safe(te_data, tmp, &mvm->time_event_list, list) {
+                if (le32_to_cpu(notif->unique_id) == te_data->uid)
+                        iwl_mvm_te_handle_notif(mvm, te_data, notif);
+        }
+unlock:
+        spin_unlock_bh(&mvm->time_event_lock);
+}
+
+static bool iwl_mvm_te_notif(struct iwl_notif_wait_data *notif_wait,
+                             struct iwl_rx_packet *pkt, void *data)
+{
+        struct iwl_mvm *mvm =
+                container_of(notif_wait, struct iwl_mvm, notif_wait);
+        struct iwl_mvm_time_event_data *te_data = data;
+        struct iwl_time_event_notif *resp;
+        int resp_len = iwl_rx_packet_payload_len(pkt);
+
+        if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_NOTIFICATION))
+                return true;
+
+        if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
+                IWL_ERR(mvm, "Invalid TIME_EVENT_NOTIFICATION response\n");
+                return true;
+        }
+
+        resp = (void *)pkt->data;
+
+        /* te_data->uid is already set in the TIME_EVENT_CMD response */
+        if (le32_to_cpu(resp->unique_id) != te_data->uid)
+                return false;
+
+        IWL_DEBUG_TE(mvm, "TIME_EVENT_NOTIFICATION response - UID = 0x%x\n",
+                     te_data->uid);
+        if (!resp->status)
+                IWL_ERR(mvm,
+                        "TIME_EVENT_NOTIFICATION received but not executed\n");
+
+        return true;
+}
+
+static bool iwl_mvm_time_event_response(struct iwl_notif_wait_data *notif_wait,
+                                        struct iwl_rx_packet *pkt, void *data)
+{
+        struct iwl_mvm *mvm =
+                container_of(notif_wait, struct iwl_mvm, notif_wait);
+        struct iwl_mvm_time_event_data *te_data = data;
+        struct iwl_time_event_resp *resp;
+        int resp_len = iwl_rx_packet_payload_len(pkt);
+
+        if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_CMD))
+                return true;
+
+        if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
+                IWL_ERR(mvm, "Invalid TIME_EVENT_CMD response\n");
+                return true;
+        }
+
+        resp = (void *)pkt->data;
+
+        /* we should never get a response to another TIME_EVENT_CMD here */
+        if (WARN_ON_ONCE(le32_to_cpu(resp->id) != te_data->id))
+                return false;
+
+        te_data->uid = le32_to_cpu(resp->unique_id);
+        IWL_DEBUG_TE(mvm, "TIME_EVENT_CMD response - UID = 0x%x\n",
+                     te_data->uid);
+        return true;
+}
+
+static int iwl_mvm_time_event_send_add(struct iwl_mvm *mvm,
+                                       struct ieee80211_vif *vif,
+                                       struct iwl_mvm_time_event_data *te_data,
+                                       struct iwl_time_event_cmd *te_cmd)
+{
+        static const u16 time_event_response[] = { TIME_EVENT_CMD };
+        struct iwl_notification_wait wait_time_event;
+        int ret;
+
+        lockdep_assert_held(&mvm->mutex);
+
+        IWL_DEBUG_TE(mvm, "Add new TE, duration %d TU\n",
+                     le32_to_cpu(te_cmd->duration));
+
+        spin_lock_bh(&mvm->time_event_lock);
+        if (WARN_ON(te_data->id != TE_MAX)) {
+                spin_unlock_bh(&mvm->time_event_lock);
+                return -EIO;
+        }
+        te_data->vif = vif;
+        te_data->duration = le32_to_cpu(te_cmd->duration);
+        te_data->id = le32_to_cpu(te_cmd->id);
+        list_add_tail(&te_data->list, &mvm->time_event_list);
+        spin_unlock_bh(&mvm->time_event_lock);
+
+        /*
+         * Use a notification wait, which really just processes the
+         * command response and doesn't wait for anything, in order
+         * to be able to process the response and get the UID inside
+         * the RX path. Using CMD_WANT_SKB doesn't work because it
+         * stores the buffer and then wakes up this thread, by which
+         * time another notification (that the time event started)
+         * might already be processed unsuccessfully.
+         */
+        iwl_init_notification_wait(&mvm->notif_wait, &wait_time_event,
+                                   time_event_response,
+                                   ARRAY_SIZE(time_event_response),
+                                   iwl_mvm_time_event_response, te_data);
+
+        ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0,
+                                            sizeof(*te_cmd), te_cmd);
+        if (ret) {
+                IWL_ERR(mvm, "Couldn't send TIME_EVENT_CMD: %d\n", ret);
+                iwl_remove_notification(&mvm->notif_wait, &wait_time_event);
+                goto out_clear_te;
+        }
+
+        /* No need to wait for anything, so just pass 1 (0 isn't valid) */
+        ret = iwl_wait_notification(&mvm->notif_wait, &wait_time_event, 1);
+        /* should never fail */
+        WARN_ON_ONCE(ret);
+
+        if (ret) {
+ out_clear_te:
+                spin_lock_bh(&mvm->time_event_lock);
+                iwl_mvm_te_clear_data(mvm, te_data);
+                spin_unlock_bh(&mvm->time_event_lock);
+        }
+        return ret;
+}
+
+void iwl_mvm_protect_session(struct iwl_mvm *mvm,
+                             struct ieee80211_vif *vif,
+                             u32 duration, u32 min_duration,
+                             u32 max_delay, bool wait_for_notif)
+{
+        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
+        struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
+        const u16 te_notif_response[] = { TIME_EVENT_NOTIFICATION };
+        struct iwl_notification_wait wait_te_notif;
+        struct iwl_time_event_cmd time_cmd = {};
+
+        lockdep_assert_held(&mvm->mutex);
+
+        if (te_data->running &&
+            time_after(te_data->end_jiffies, TU_TO_EXP_TIME(min_duration))) {
+                IWL_DEBUG_TE(mvm, "We have enough time in the current TE: %u\n",
+                             jiffies_to_msecs(te_data->end_jiffies - jiffies));
+                return;
+        }
+
+        if (te_data->running) {
+                IWL_DEBUG_TE(mvm, "extend 0x%x: only %u ms left\n",
+                             te_data->uid,
+                             jiffies_to_msecs(te_data->end_jiffies - jiffies));
+                /*
+                 * we don't have enough time
+                 * cancel the current TE and issue a new one
+                 * Of course it would be better to remove the old one only
+                 * when the new one is added, but we don't care if we are off
+                 * channel for a bit. All we need to do, is not to return
+                 * before we actually begin to be on the channel.
+                 */
+                iwl_mvm_stop_session_protection(mvm, vif);
+        }
+
+        time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
+        time_cmd.id_and_color =
+                cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
+        time_cmd.id = cpu_to_le32(TE_BSS_STA_AGGRESSIVE_ASSOC);
+
+        time_cmd.apply_time = cpu_to_le32(0);
+
+        time_cmd.max_frags = TE_V2_FRAG_NONE;
+        time_cmd.max_delay = cpu_to_le32(max_delay);
+        /* TODO: why do we need to interval = bi if it is not periodic? */
+        time_cmd.interval = cpu_to_le32(1);
+        time_cmd.duration = cpu_to_le32(duration);
+        time_cmd.repeat = 1;
+        time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
+                                      TE_V2_NOTIF_HOST_EVENT_END |
+                                      T2_V2_START_IMMEDIATELY);
+
+        if (!wait_for_notif) {
+                iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
+                return;
+        }
+
+        /*
+         * Create notification_wait for the TIME_EVENT_NOTIFICATION to use
+         * right after we send the time event
+         */
+        iwl_init_notification_wait(&mvm->notif_wait, &wait_te_notif,
+                                   te_notif_response,
+                                   ARRAY_SIZE(te_notif_response),
+                                   iwl_mvm_te_notif, te_data);
+
+        /* If TE was sent OK - wait for the notification that started */
+        if (iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd)) {
+                IWL_ERR(mvm, "Failed to add TE to protect session\n");
+                iwl_remove_notification(&mvm->notif_wait, &wait_te_notif);
+        } else if (iwl_wait_notification(&mvm->notif_wait, &wait_te_notif,
+                                         TU_TO_JIFFIES(max_delay))) {
+                IWL_ERR(mvm, "Failed to protect session until TE\n");
+        }
+}
+
+static bool __iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
+                                        struct iwl_mvm_time_event_data *te_data,
+                                        u32 *uid)
+{
+        u32 id;
+
+        /*
+         * It is possible that by the time we got to this point the time
+         * event was already removed.
+         */
+        spin_lock_bh(&mvm->time_event_lock);
+
+        /* Save time event uid before clearing its data */
+        *uid = te_data->uid;
+        id = te_data->id;
+
+        /*
+         * The clear_data function handles time events that were already removed
+         */
+        iwl_mvm_te_clear_data(mvm, te_data);
+        spin_unlock_bh(&mvm->time_event_lock);
+
+        /*
+         * It is possible that by the time we try to remove it, the time event
+         * has already ended and removed. In such a case there is no need to
+         * send a removal command.
+         */
+        if (id == TE_MAX) {
+                IWL_DEBUG_TE(mvm, "TE 0x%x has already ended\n", *uid);
+                return false;
+        }
+
+        return true;
+}
+
+/*
+ * Explicit request to remove a aux roc time event. The removal of a time
+ * event needs to be synchronized with the flow of a time event's end
+ * notification, which also removes the time event from the op mode
+ * data structures.
+ */
+static void iwl_mvm_remove_aux_roc_te(struct iwl_mvm *mvm,
+                                      struct iwl_mvm_vif *mvmvif,
+                                      struct iwl_mvm_time_event_data *te_data)
+{
+        struct iwl_hs20_roc_req aux_cmd = {};
+        u32 uid;
+        int ret;
+
+        if (!__iwl_mvm_remove_time_event(mvm, te_data, &uid))
+                return;
+
+        aux_cmd.event_unique_id = cpu_to_le32(uid);
+        aux_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
+        aux_cmd.id_and_color =
+                cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
+        IWL_DEBUG_TE(mvm, "Removing BSS AUX ROC TE 0x%x\n",
+                     le32_to_cpu(aux_cmd.event_unique_id));
+        ret = iwl_mvm_send_cmd_pdu(mvm, HOT_SPOT_CMD, 0,
+                                   sizeof(aux_cmd), &aux_cmd);
+
+        if (WARN_ON(ret))
+                return;
+}
+
+/*
+ * Explicit request to remove a time event. The removal of a time event needs to
+ * be synchronized with the flow of a time event's end notification, which also
+ * removes the time event from the op mode data structures.
+ */
+void iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
+                               struct iwl_mvm_vif *mvmvif,
+                               struct iwl_mvm_time_event_data *te_data)
+{
+        struct iwl_time_event_cmd time_cmd = {};
+        u32 uid;
+        int ret;
+
+        if (!__iwl_mvm_remove_time_event(mvm, te_data, &uid))
+                return;
+
+        /* When we remove a TE, the UID is to be set in the id field */
+        time_cmd.id = cpu_to_le32(uid);
+        time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
+        time_cmd.id_and_color =
+                cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
+
+        IWL_DEBUG_TE(mvm, "Removing TE 0x%x\n", le32_to_cpu(time_cmd.id));
+        ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0,
+                                   sizeof(time_cmd), &time_cmd);
+        if (WARN_ON(ret))
+                return;
+}
+
+void iwl_mvm_stop_session_protection(struct iwl_mvm *mvm,
+                                     struct ieee80211_vif *vif)
+{
+        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
+        struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
+
+        lockdep_assert_held(&mvm->mutex);
+        iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
+}
+
+int iwl_mvm_start_p2p_roc(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
+                          int duration, enum ieee80211_roc_type type)
+{
+        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
+        struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
+        struct iwl_time_event_cmd time_cmd = {};
+
+        lockdep_assert_held(&mvm->mutex);
+        if (te_data->running) {
+                IWL_WARN(mvm, "P2P_DEVICE remain on channel already running\n");
+                return -EBUSY;
+        }
+
+        /*
+         * Flush the done work, just in case it's still pending, so that
+         * the work it does can complete and we can accept new frames.
+         */
+        flush_work(&mvm->roc_done_wk);
+
+        time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
+        time_cmd.id_and_color =
+                cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
+
+        switch (type) {
+        case IEEE80211_ROC_TYPE_NORMAL:
+                time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_NORMAL);
+                break;
+        case IEEE80211_ROC_TYPE_MGMT_TX:
+                time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_MGMT_TX);
+                break;
+        default:
+                WARN_ONCE(1, "Got an invalid ROC type\n");
+                return -EINVAL;
+        }
+
+        time_cmd.apply_time = cpu_to_le32(0);
+        time_cmd.interval = cpu_to_le32(1);
+
+        /*
+         * The P2P Device TEs can have lower priority than other events
+         * that are being scheduled by the driver/fw, and thus it might not be
+         * scheduled. To improve the chances of it being scheduled, allow them
+         * to be fragmented, and in addition allow them to be delayed.
+         */
+        time_cmd.max_frags = min(MSEC_TO_TU(duration)/50, TE_V2_FRAG_ENDLESS);
+        time_cmd.max_delay = cpu_to_le32(MSEC_TO_TU(duration/2));
+        time_cmd.duration = cpu_to_le32(MSEC_TO_TU(duration));
+        time_cmd.repeat = 1;
+        time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
+                                      TE_V2_NOTIF_HOST_EVENT_END |
+                                      T2_V2_START_IMMEDIATELY);
+
+        return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
+}
+
+void iwl_mvm_stop_roc(struct iwl_mvm *mvm)
+{
+        struct iwl_mvm_vif *mvmvif = NULL;
+        struct iwl_mvm_time_event_data *te_data;
+        bool is_p2p = false;
+
+        lockdep_assert_held(&mvm->mutex);
+
+        spin_lock_bh(&mvm->time_event_lock);
+
+        /*
+         * Iterate over the list of time events and find the time event that is
+         * associated with a P2P_DEVICE interface.
+         * This assumes that a P2P_DEVICE interface can have only a single time
+         * event at any given time and this time event coresponds to a ROC
+         * request
+         */
+        list_for_each_entry(te_data, &mvm->time_event_list, list) {
+                if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
+                        mvmvif = iwl_mvm_vif_from_mac80211(te_data->vif);
+                        is_p2p = true;
+                        goto remove_te;
+                }
+        }
+
+        /* There can only be at most one AUX ROC time event, we just use the
+         * list to simplify/unify code. Remove it if it exists.
+         */
+        te_data = list_first_entry_or_null(&mvm->aux_roc_te_list,
+                                           struct iwl_mvm_time_event_data,
+                                           list);
+        if (te_data)
+                mvmvif = iwl_mvm_vif_from_mac80211(te_data->vif);
+
+remove_te:
+        spin_unlock_bh(&mvm->time_event_lock);
+
+        if (!mvmvif) {
+                IWL_WARN(mvm, "No remain on channel event\n");
+                return;
+        }
+
+        if (is_p2p)
+                iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
+        else
+                iwl_mvm_remove_aux_roc_te(mvm, mvmvif, te_data);
+
+        iwl_mvm_roc_finished(mvm);
+}
+
+int iwl_mvm_schedule_csa_period(struct iwl_mvm *mvm,
+                                struct ieee80211_vif *vif,
+                                u32 duration, u32 apply_time)
+{
+        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
+        struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
+        struct iwl_time_event_cmd time_cmd = {};
+
+        lockdep_assert_held(&mvm->mutex);
+
+        if (te_data->running) {
+                IWL_DEBUG_TE(mvm, "CS period is already scheduled\n");
+                return -EBUSY;
+        }
+
+        time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
+        time_cmd.id_and_color =
+                cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
+        time_cmd.id = cpu_to_le32(TE_CHANNEL_SWITCH_PERIOD);
+        time_cmd.apply_time = cpu_to_le32(apply_time);
+        time_cmd.max_frags = TE_V2_FRAG_NONE;
+        time_cmd.duration = cpu_to_le32(duration);
+        time_cmd.repeat = 1;
+        time_cmd.interval = cpu_to_le32(1);
+        time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
+                                      TE_V2_ABSENCE);
+
+        return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
+}