From mboxrd@z Thu Jan 1 00:00:00 1970 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, 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 192C8C433ED for ; Thu, 22 Apr 2021 17:18:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D5EEF613E0 for ; Thu, 22 Apr 2021 17:18:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238067AbhDVRSv (ORCPT ); Thu, 22 Apr 2021 13:18:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45768 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236459AbhDVRSt (ORCPT ); Thu, 22 Apr 2021 13:18:49 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AC364C06138B for ; Thu, 22 Apr 2021 10:18:14 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id v63-20020a252f420000b02904ecfc17c803so9603165ybv.18 for ; Thu, 22 Apr 2021 10:18:14 -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=ceNNIt0toACUZ6hPWo/h5uWqhVdPCc0ReJ6Q5pwq5Ak=; b=buRWJQbkifbcZCqnQh43B9eKhqL1ASVyKu88du/n/bk/B70T2S/U1yk16GHd+Yf362 UC+39vZTN/0PoPS1RFQNJMWOH3DPtj/t3jSDukycpXZAfw0MHsQ00pUJU6P0AedmwadB hJSjfM8CzHA4oHINyWhcslNaVrrhvnyRrdF6g6pP9SsJIC4Jf+MXAwUQpAAAInUyvWhg F8cP2awTRXkbwcRiBAVMWQeQJDGJPNKKZ7yII/Vk2fRhRMVi2n+4MXoEzC57HoeFAl51 oBVf6eFc6cKu5Ta2B4VFYTM4yZYrgSJRKPat6PWvRMuSFyZwqNh2Lew4qsOjxus6Eapk 5CAA== 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=ceNNIt0toACUZ6hPWo/h5uWqhVdPCc0ReJ6Q5pwq5Ak=; b=EmGVwXWZn0ikD/mYebR6jc1ouFZoV+w+tnfv8DdSaWvrzO1+/IrmizgOBXmcR+H96F kS1S4sPJcW4xGxzbw6JH9P7J0b/IBobW8Ijxa2SktX1Gih+CvCnH9hXbvHeXXIW0wd4A jm6IQ1BUg/+Bt+nl2R7WBYuXbD+bYmOb6XK07eX9f4Au+sdkL9BlG2D1Ps/GmaV373CF Ro0HtXvTY4dV2PVOJkhf29KgZ0++/dN7RgqMek7jDMdCI0pPpt8PhDIKch3aHwgI+/ie J2BxYCIwz4TJ8ilrsNDBSCM+JLFxotNIIaMy6FbRYsxx5PFdx+mNfedkGb1AcTw6dq5o yxhQ== X-Gm-Message-State: AOAM533Q6jh5dnAloFJGJkhwnGbOSOX0pkc+E1GGedFZo93uPGHJuHy+ jfDAkLmeDqIjejSyWhhjBaxfpo3mjMowoA== X-Google-Smtp-Source: ABdhPJzaT75VXKKRmwcscRGaTf+mEVxHomDHDMYlXFBZ60+GAlmSG0kUwt4/f5sTYQ+4airpcnbwUEI0EFAgGg== X-Received: from mmandlik.mtv.corp.google.com ([2620:15c:202:201:e0cc:f48d:f53c:5718]) (user=mmandlik job=sendgmr) by 2002:a25:b68a:: with SMTP id s10mr6461442ybj.121.1619111893854; Thu, 22 Apr 2021 10:18:13 -0700 (PDT) Date: Thu, 22 Apr 2021 10:17:53 -0700 Message-Id: <20210422101657.v3.1.I14da3750a343d8d48921fffb7c6561337b6e6082@changeid> Mime-Version: 1.0 X-Mailer: git-send-email 2.31.1.498.g6c1eba8ee3d-goog Subject: [PATCH v3] Bluetooth: Add ncmd=0 recovery handling From: Manish Mandlik To: marcel@holtmann.org, luiz.dentz@gmail.com Cc: Alain Michaud , linux-bluetooth@vger.kernel.org, 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 Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 v3: - Restructure ncmd_timer scheduling in hci_event.c - Cancel delayed work in hci_dev_do_close - Do not inject hw error during HCI_INIT - Update comment, add log message while injecting hw error 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 | 22 ++++++++++++++++++++++ net/bluetooth/hci_event.c | 22 ++++++++++++++++++---- 4 files changed, 42 insertions(+), 4 deletions(-) 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..37789c5d0579 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -1723,6 +1723,7 @@ int hci_dev_do_close(struct hci_dev *hdev) } cancel_delayed_work(&hdev->power_off); + cancel_delayed_work(&hdev->ncmd_timer); hci_request_cancel_all(hdev); hci_req_sync_lock(hdev); @@ -2769,6 +2770,24 @@ 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"); + + /* No hardware error event needs to be injected if the ncmd timer + * triggers during HCI_INIT. + */ + if (test_bit(HCI_INIT, &hdev->flags)) + return; + + /* This is an irrecoverable state, inject hardware error event */ + hci_reset_dev(hdev); +} + struct oob_data *hci_find_remote_oob_data(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 bdaddr_type) { @@ -3831,6 +3850,7 @@ 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); @@ -4068,6 +4088,8 @@ int hci_reset_dev(struct hci_dev *hdev) hci_skb_pkt_type(skb) = HCI_EVENT_PKT; skb_put_data(skb, hw_err, 3); + bt_dev_err(hdev, "Injecting HCI hardware error event"); + /* Send Hardware Error to upper stack */ return hci_recv_frame(hdev, skb); } diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c index cf2f4a0abdbd..8cd4bcf5dd00 100644 --- a/net/bluetooth/hci_event.c +++ b/net/bluetooth/hci_event.c @@ -3635,8 +3635,15 @@ 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)) - atomic_set(&hdev->cmd_cnt, 1); + if (!test_bit(HCI_RESET, &hdev->flags)) { + if (ev->ncmd) { + cancel_delayed_work(&hdev->ncmd_timer); + atomic_set(&hdev->cmd_cnt, 1); + } else { + schedule_delayed_work(&hdev->ncmd_timer, + HCI_NCMD_TIMEOUT); + } + } hci_req_cmd_complete(hdev, *opcode, *status, req_complete, req_complete_skb); @@ -3740,8 +3747,15 @@ 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)) - atomic_set(&hdev->cmd_cnt, 1); + if (!test_bit(HCI_RESET, &hdev->flags)) { + if (ev->ncmd) { + cancel_delayed_work(&hdev->ncmd_timer); + atomic_set(&hdev->cmd_cnt, 1); + } else { + schedule_delayed_work(&hdev->ncmd_timer, + HCI_NCMD_TIMEOUT); + } + } /* Indicate request completion if the command failed. Also, if * we're not waiting for a special event and we get a success -- 2.31.1.498.g6c1eba8ee3d-goog