From patchwork Thu Apr 8 02:36:17 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manish Mandlik X-Patchwork-Id: 418039 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=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT, USER_IN_DEF_DKIM_WL autolearn=unavailable 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 4FEF2C433B4 for ; Thu, 8 Apr 2021 02:36:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1344861175 for ; Thu, 8 Apr 2021 02:36:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229770AbhDHCgd (ORCPT ); Wed, 7 Apr 2021 22:36:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37568 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229585AbhDHCgc (ORCPT ); Wed, 7 Apr 2021 22:36:32 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 05450C061762 for ; Wed, 7 Apr 2021 19:36:21 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id f75so772767yba.8 for ; Wed, 07 Apr 2021 19:36:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:message-id:mime-version:subject:from:to:cc; bh=9P94XPzyhu54mxeLpaqaTNwt22nENhiWy81YfXq9m4g=; b=PT3SM2aN7e9WwbcobQRwv+lU1jTLBwNwoSFqJ5RwmKnECLap8sMpuk041haf8aYQ5v O2WrYps/ywX6/2Skz7d3H8LFLQZhjjkmZAQPIj505SaA4DgbMN93Kd7R9YN+/FOegF4S XlyBenvOxjeAsnKhQJ7/fxK/19Of7JWkXzK0TmPmJ+eowQUgOwl5H0KLVJDCMbHwqwl1 /Kh4b7Ss2k7eDmx94wKDwtUMqDlD9GtAK6kH21olu+m9UVbtiVcEQN1ZzmNXuU1xju3P M/l8JdNmzLn8no61q/tBZdNjjT77irAW0vCJoRfcmzQrDxLWjyD54aLGQuRCPoQnAbQm iGhg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:message-id:mime-version:subject:from:to:cc; bh=9P94XPzyhu54mxeLpaqaTNwt22nENhiWy81YfXq9m4g=; b=J94Uz5xFsZJoPi8+IKJ2USt+/jBbGUi7cWKCuq1Pna6kNJhl2qx9UIJrqv4Uem3VU1 hnnXam65dxJ8V7mbObsXk2/mWTpDM2QIrTXSLGLOj42JGpSb2LR5qbYLZi8UrwNB37Dy EJy0+LjWa+jwLpXdlBWY1/C5qVF368NvaE3F4xmEXpvdHhbj9UI+8ceV+T1XHFLrA+np VcZ1P++Xs67UOxAP7XvK/IaBNLH+EBJMr5OAXJB8jLrzcxAvyhXGN0v5u4fHr2YgyQME wiDhYwaN4QTCOb5k0tSstqfnedtOwfpslYR9J9bKfyOlOZVQQ8TfniVXq144DMULo5Je lcSg== X-Gm-Message-State: AOAM533X1ZMbr7XQoO4KdQWeg/ayDFJ2lCkWEh1m1KAdCEZVwYHtFkpX ki1DFUPzjbDLXQvWiRemrFX4P466F0flxg== X-Google-Smtp-Source: ABdhPJyWnMXxgGZq1oXRGSOG5fCi+cG+ZwhfZEyBt7SbR+VA6evWsTWyeVEbW8liUdm4LqT7OkwpC4xcZKmQlg== X-Received: from mmandlik.mtv.corp.google.com ([2620:15c:202:201:c5c0:d290:d725:ddeb]) (user=mmandlik job=sendgmr) by 2002:a25:afc3:: with SMTP id d3mr10445737ybj.83.1617849381086; Wed, 07 Apr 2021 19:36:21 -0700 (PDT) Date: Wed, 7 Apr 2021 19:36:17 -0700 Message-Id: <20210407193611.v2.1.I14da3750a343d8d48921fffb7c6561337b6e6082@changeid> Mime-Version: 1.0 X-Mailer: git-send-email 2.31.0.208.g409f899ff0-goog Subject: [PATCH v2] Bluetooth: Add ncmd=0 recovery handling From: Manish Mandlik To: marcel@holtmann.org, luiz.dentz@gmail.com Cc: linux-bluetooth@vger.kernel.org, Alain Michaud , chromeos-bluetooth-upstreaming@chromium.org, Manish Mandlik , Abhishek Pandit-Subedi , "David S. Miller" , Jakub Kicinski , Johan Hedberg , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org During command status or command complete event, the controller may set ncmd=0 indicating that it is not accepting any more commands. In such a case, host holds off sending any more commands to the controller. If the controller doesn't recover from such condition, host will wait forever, until the user decides that the Bluetooth is broken and may power cycles the Bluetooth. This patch triggers the hardware error to reset the controller and driver when it gets into such state as there is no other wat out. Reviewed-by: Abhishek Pandit-Subedi Signed-off-by: Manish Mandlik --- Changes in v2: - Emit the hardware error when ncmd=0 occurs include/net/bluetooth/hci.h | 1 + include/net/bluetooth/hci_core.h | 1 + net/bluetooth/hci_core.c | 15 +++++++++++++++ net/bluetooth/hci_event.c | 10 ++++++++++ 4 files changed, 27 insertions(+) diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h index ea4ae551c426..c4b0650fb9ae 100644 --- a/include/net/bluetooth/hci.h +++ b/include/net/bluetooth/hci.h @@ -339,6 +339,7 @@ enum { #define HCI_PAIRING_TIMEOUT msecs_to_jiffies(60000) /* 60 seconds */ #define HCI_INIT_TIMEOUT msecs_to_jiffies(10000) /* 10 seconds */ #define HCI_CMD_TIMEOUT msecs_to_jiffies(2000) /* 2 seconds */ +#define HCI_NCMD_TIMEOUT msecs_to_jiffies(4000) /* 4 seconds */ #define HCI_ACL_TX_TIMEOUT msecs_to_jiffies(45000) /* 45 seconds */ #define HCI_AUTO_OFF_TIMEOUT msecs_to_jiffies(2000) /* 2 seconds */ #define HCI_POWER_OFF_TIMEOUT msecs_to_jiffies(5000) /* 5 seconds */ diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h index ebdd4afe30d2..f14692b39fd5 100644 --- a/include/net/bluetooth/hci_core.h +++ b/include/net/bluetooth/hci_core.h @@ -470,6 +470,7 @@ struct hci_dev { struct delayed_work service_cache; struct delayed_work cmd_timer; + struct delayed_work ncmd_timer; struct work_struct rx_work; struct work_struct cmd_work; diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index b0d9c36acc03..c102a8763cb5 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -2769,6 +2769,20 @@ static void hci_cmd_timeout(struct work_struct *work) queue_work(hdev->workqueue, &hdev->cmd_work); } +/* HCI ncmd timer function */ +static void hci_ncmd_timeout(struct work_struct *work) +{ + struct hci_dev *hdev = container_of(work, struct hci_dev, + ncmd_timer.work); + + bt_dev_err(hdev, "Controller not accepting commands anymore: ncmd = 0"); + + /* This is an irrecoverable state. Inject hw error event to reset + * the device and driver. + */ + hci_reset_dev(hdev); +} + struct oob_data *hci_find_remote_oob_data(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 bdaddr_type) { @@ -3831,6 +3845,7 @@ struct hci_dev *hci_alloc_dev(void) init_waitqueue_head(&hdev->suspend_wait_q); INIT_DELAYED_WORK(&hdev->cmd_timer, hci_cmd_timeout); + INIT_DELAYED_WORK(&hdev->ncmd_timer, hci_ncmd_timeout); hci_request_setup(hdev); diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c index cf2f4a0abdbd..114a9170d809 100644 --- a/net/bluetooth/hci_event.c +++ b/net/bluetooth/hci_event.c @@ -3635,6 +3635,11 @@ static void hci_cmd_complete_evt(struct hci_dev *hdev, struct sk_buff *skb, if (*opcode != HCI_OP_NOP) cancel_delayed_work(&hdev->cmd_timer); + if (!ev->ncmd && !test_bit(HCI_RESET, &hdev->flags)) + schedule_delayed_work(&hdev->ncmd_timer, HCI_NCMD_TIMEOUT); + else + cancel_delayed_work(&hdev->ncmd_timer); + if (ev->ncmd && !test_bit(HCI_RESET, &hdev->flags)) atomic_set(&hdev->cmd_cnt, 1); @@ -3740,6 +3745,11 @@ static void hci_cmd_status_evt(struct hci_dev *hdev, struct sk_buff *skb, if (*opcode != HCI_OP_NOP) cancel_delayed_work(&hdev->cmd_timer); + if (!ev->ncmd && !test_bit(HCI_RESET, &hdev->flags)) + schedule_delayed_work(&hdev->ncmd_timer, HCI_NCMD_TIMEOUT); + else + cancel_delayed_work(&hdev->ncmd_timer); + if (ev->ncmd && !test_bit(HCI_RESET, &hdev->flags)) atomic_set(&hdev->cmd_cnt, 1);