From patchwork Wed Dec 9 21:16:31 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luca Coelho X-Patchwork-Id: 341611 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4D705C433FE for ; Wed, 9 Dec 2020 21:39:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0B36C23C44 for ; Wed, 9 Dec 2020 21:39:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388277AbgLIVjY (ORCPT ); Wed, 9 Dec 2020 16:39:24 -0500 Received: from paleale.coelho.fi ([176.9.41.70]:35946 "EHLO farmhouse.coelho.fi" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2388151AbgLIVjX (ORCPT ); Wed, 9 Dec 2020 16:39:23 -0500 Received: from 91-156-6-193.elisa-laajakaista.fi ([91.156.6.193] helo=redipa.ger.corp.intel.com) by farmhouse.coelho.fi with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.93) (envelope-from ) id 1kn6pm-003Drx-Gt; Wed, 09 Dec 2020 23:17:14 +0200 From: Luca Coelho To: kvalo@codeaurora.org Cc: linux-wireless@vger.kernel.org Date: Wed, 9 Dec 2020 23:16:31 +0200 Message-Id: X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201209211651.968276-1-luca@coelho.fi> References: <20201209211651.968276-1-luca@coelho.fi> MIME-Version: 1.0 Subject: [PATCH v2 27/47] iwlwifi: mvm: do more useful queue sync accounting Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Johannes Berg We're currently doing accounting on the queue sync with an atomic variable that counts down the number of remaining notifications that we still need. As we've been hitting issues in this area, modify this to track a bitmap of queues, not just the number of queues, and print out the remaining bitmap in the warning. Signed-off-by: Johannes Berg Signed-off-by: Luca Coelho --- drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c | 11 ++++++----- drivers/net/wireless/intel/iwlwifi/mvm/mvm.h | 2 +- drivers/net/wireless/intel/iwlwifi/mvm/ops.c | 2 +- drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c | 10 +++++++--- 4 files changed, 15 insertions(+), 10 deletions(-) diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c index 766aeeaf1fcf..be3d4515b772 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c @@ -5097,8 +5097,7 @@ void iwl_mvm_sync_rx_queues_internal(struct iwl_mvm *mvm, if (notif->sync) { notif->cookie = mvm->queue_sync_cookie; - atomic_set(&mvm->queue_sync_counter, - mvm->trans->num_rx_queues); + mvm->queue_sync_state = (1 << mvm->trans->num_rx_queues) - 1; } ret = iwl_mvm_notify_rx_queue(mvm, qmask, notif, size, !notif->sync); @@ -5110,14 +5109,16 @@ void iwl_mvm_sync_rx_queues_internal(struct iwl_mvm *mvm, if (notif->sync) { lockdep_assert_held(&mvm->mutex); ret = wait_event_timeout(mvm->rx_sync_waitq, - atomic_read(&mvm->queue_sync_counter) == 0 || + READ_ONCE(mvm->queue_sync_state) == 0 || iwl_mvm_is_radio_killed(mvm), HZ); - WARN_ON_ONCE(!ret && !iwl_mvm_is_radio_killed(mvm)); + WARN_ONCE(!ret && !iwl_mvm_is_radio_killed(mvm), + "queue sync: failed to sync, state is 0x%lx\n", + mvm->queue_sync_state); } out: - atomic_set(&mvm->queue_sync_counter, 0); + mvm->queue_sync_state = 0; if (notif->sync) mvm->queue_sync_cookie++; } diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h index de43ffff0a5d..afa04952107e 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h +++ b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h @@ -842,7 +842,7 @@ struct iwl_mvm { unsigned long status; u32 queue_sync_cookie; - atomic_t queue_sync_counter; + unsigned long queue_sync_state; /* * for beacon filtering - * currently only one interface can be supported diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c index e54c48af1913..2a497fb77e3a 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c @@ -703,7 +703,7 @@ iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg, init_waitqueue_head(&mvm->rx_sync_waitq); - atomic_set(&mvm->queue_sync_counter, 0); + mvm->queue_sync_state = 0; SET_IEEE80211_DEV(mvm->hw, mvm->trans->dev); diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c index ef5bd58ef742..d4465164457d 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c @@ -827,9 +827,13 @@ void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct napi_struct *napi, WARN_ONCE(1, "Invalid identifier %d", internal_notif->type); } - if (internal_notif->sync && - !atomic_dec_return(&mvm->queue_sync_counter)) - wake_up(&mvm->rx_sync_waitq); + if (internal_notif->sync) { + WARN_ONCE(!test_and_clear_bit(queue, &mvm->queue_sync_state), + "queue sync: queue %d responded a second time!\n", + queue); + if (READ_ONCE(mvm->queue_sync_state) == 0) + wake_up(&mvm->rx_sync_waitq); + } } static void iwl_mvm_oldsn_workaround(struct iwl_mvm *mvm,