diff options
Diffstat (limited to 'drivers/net/wireless/iwlwifi/mvm/time-event.c')
| -rw-r--r-- | drivers/net/wireless/iwlwifi/mvm/time-event.c | 527 |
1 files changed, 0 insertions, 527 deletions
diff --git a/drivers/net/wireless/iwlwifi/mvm/time-event.c b/drivers/net/wireless/iwlwifi/mvm/time-event.c deleted file mode 100644 index ad9bbca99213..000000000000 --- a/drivers/net/wireless/iwlwifi/mvm/time-event.c +++ /dev/null @@ -1,527 +0,0 @@ -/****************************************************************************** - * - * 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 - 2013 Intel Corporation. All rights reserved. - * - * 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 - 2013 Intel Corporation. All rights reserved. - * 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" - -/* A TimeUnit is 1024 microsecond */ -#define TU_TO_JIFFIES(_tu) (usecs_to_jiffies((_tu) * 1024)) -#define MSEC_TO_TU(_msec) (_msec*1000/1024) - -/* - * 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->id == TE_MAX) - 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); - - synchronize_net(); - - /* - * Flush the offchannel queue -- this is called when the time - * event finishes or is cancelled, 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, BIT(IWL_MVM_OFFCHANNEL_QUEUE), false); -} - -static void iwl_mvm_roc_finished(struct iwl_mvm *mvm) -{ - /* - * First, clear the ROC_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). - */ - clear_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status); - - /* - * 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); -} - -/* - * 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)); - - /* - * 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). - */ - WARN_ONCE(!le32_to_cpu(notif->status), - "Failed to schedule time event\n"); - - if (le32_to_cpu(notif->action) & TE_NOTIF_HOST_EVENT_END) { - IWL_DEBUG_TE(mvm, - "TE ended - current time %lu, estimated end %lu\n", - jiffies, te_data->end_jiffies); - - if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) { - ieee80211_remain_on_channel_expired(mvm->hw); - iwl_mvm_roc_finished(mvm); - } - - /* - * By now, we should have finished association - * and know the dtim period. - */ - if (te_data->vif->type == NL80211_IFTYPE_STATION && - (!te_data->vif->bss_conf.assoc || - !te_data->vif->bss_conf.dtim_period)) { - IWL_ERR(mvm, - "No assocation and the time event is over already...\n"); - ieee80211_connection_loss(te_data->vif); - } - - iwl_mvm_te_clear_data(mvm, te_data); - } else if (le32_to_cpu(notif->action) & TE_NOTIF_HOST_EVENT_START) { - te_data->running = true; - te_data->end_jiffies = jiffies + - TU_TO_JIFFIES(te_data->duration); - - if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) { - set_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status); - ieee80211_ready_on_channel(mvm->hw); - } - } else { - IWL_WARN(mvm, "Got TE with unknown action\n"); - } -} - -/* - * The Rx handler for time event notifications - */ -int iwl_mvm_rx_time_event_notif(struct iwl_mvm *mvm, - struct iwl_rx_cmd_buffer *rxb, - struct iwl_device_cmd *cmd) -{ - 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); - 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); - } - spin_unlock_bh(&mvm->time_event_lock); - - return 0; -} - -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 = le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK; - - if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_CMD)) - return true; - - if (WARN_ON_ONCE(resp_len != sizeof(pkt->hdr) + 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 u8 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, CMD_SYNC, - 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) -{ - 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 && - time_after(te_data->end_jiffies, - jiffies + TU_TO_JIFFIES(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(iwl_read_prph(mvm->trans, DEVICE_SYSTEM_TIME_REG)); - - time_cmd.dep_policy = TE_INDEPENDENT; - time_cmd.is_present = cpu_to_le32(1); - time_cmd.max_frags = cpu_to_le32(TE_FRAG_NONE); - time_cmd.max_delay = cpu_to_le32(500); - /* TODO: why do we need to interval = bi if it is not periodic? */ - time_cmd.interval = cpu_to_le32(1); - time_cmd.interval_reciprocal = cpu_to_le32(iwl_mvm_reciprocal(1)); - time_cmd.duration = cpu_to_le32(duration); - time_cmd.repeat = cpu_to_le32(1); - time_cmd.notify = cpu_to_le32(TE_NOTIF_HOST_EVENT_START | - TE_NOTIF_HOST_EVENT_END); - - iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd); -} - -/* - * 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 id, uid; - int ret; - - /* - * 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; - } - - /* 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, CMD_SYNC, - 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.dep_policy = cpu_to_le32(TE_INDEPENDENT); - time_cmd.is_present = cpu_to_le32(1); - 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 = cpu_to_le32(MSEC_TO_TU(duration)/20); - 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 = cpu_to_le32(1); - time_cmd.notify = cpu_to_le32(TE_NOTIF_HOST_EVENT_START | - TE_NOTIF_HOST_EVENT_END); - - return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd); -} - -void iwl_mvm_stop_p2p_roc(struct iwl_mvm *mvm) -{ - struct iwl_mvm_vif *mvmvif; - struct iwl_mvm_time_event_data *te_data; - - lockdep_assert_held(&mvm->mutex); - - /* - * 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 - */ - mvmvif = NULL; - spin_lock_bh(&mvm->time_event_lock); - 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); - break; - } - } - spin_unlock_bh(&mvm->time_event_lock); - - if (!mvmvif) { - IWL_WARN(mvm, "P2P_DEVICE no remain on channel event\n"); - return; - } - - iwl_mvm_remove_time_event(mvm, mvmvif, te_data); - - iwl_mvm_roc_finished(mvm); -} |