From patchwork Wed Mar 4 01:06:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Abhishek Pandit-Subedi X-Patchwork-Id: 11419055 X-Patchwork-Delegate: marcel@holtmann.org Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3D62814E3 for ; Wed, 4 Mar 2020 01:07:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F10D82073B for ; Wed, 4 Mar 2020 01:07:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="bhTgCiyn" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387518AbgCDBHR (ORCPT ); Tue, 3 Mar 2020 20:07:17 -0500 Received: from mail-pf1-f196.google.com ([209.85.210.196]:34701 "EHLO mail-pf1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387473AbgCDBHD (ORCPT ); Tue, 3 Mar 2020 20:07:03 -0500 Received: by mail-pf1-f196.google.com with SMTP id y21so68189pfp.1 for ; Tue, 03 Mar 2020 17:07:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=JYRsa8LiLMmxRrfRq1y5rricKWuX0XT0FSeyudFATFg=; b=bhTgCiynD3In4EQb/HLoFk6IVA0Z9QG8ylLCgd0B7KHDE+eEhsCLqDBVP7pD1EdjZc lHIJ2Wt5u4kqWYQNIiKIxCC/6Bm9EYvwPP2qSxTpdvJnoyj1h4YX8pHEDwC4Q3yNH56W RncDkPtwfsico0cdhxmet31N3DsjOKvptb1/s= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=JYRsa8LiLMmxRrfRq1y5rricKWuX0XT0FSeyudFATFg=; b=T4I7yeHHRTK6gOdPorPsuR59wziYKiC3MAiuXT0miSsne1rJP7nfADnwy1JgakAobg 5EJs0yb36mZUc3PlIznrm7GhOD7u2smA8AO14906mxr8DnJScispHzLgu+vtNqDi8lGR PvgHjNvX6mUrYgz0QN0pirgsg01JssjiEcip8nTuAADyck3r449tapdI88ePyNik1ndt bMmYOgn+E5wM6MplEH9lShz9V8lt8eGDvKIsxmWdKrw/XIhMl3k3kcuy16lPmFS0JzaI Xfe+iBBPb8LbRk1RxBuQvyMT64kuIGN+WYr/ZHLbWpsTp4TrwOHOFBbayB7jQfWddsp/ Kppw== X-Gm-Message-State: ANhLgQ1Zg6LWvj7pW3K+FTae0mCZuTHm8dxDnKPpeqLCKhcUWUWf7jpd kjVCg4Lo44rTWs8hL/buCO4Lmg== X-Google-Smtp-Source: ADFU+vvbuVziHqtjwWdxgnmunEs9OISQfQUzb55n91LvOZF8kMYIkq6KG8xM+3lbyDMs+DIejvXG/g== X-Received: by 2002:a63:2166:: with SMTP id s38mr179995pgm.83.1583284021214; Tue, 03 Mar 2020 17:07:01 -0800 (PST) Received: from apsdesk.mtv.corp.google.com ([2620:15c:202:1:e09a:8d06:a338:aafb]) by smtp.gmail.com with ESMTPSA id w2sm17780889pfb.138.2020.03.03.17.07.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Mar 2020 17:07:00 -0800 (PST) From: Abhishek Pandit-Subedi To: marcel@holtmann.org, luiz.dentz@gmail.com, alainm@chromium.org Cc: linux-bluetooth@vger.kernel.org, chromeos-bluetooth-upstreaming@chromium.org, Abhishek Pandit-Subedi , "David S. Miller" , Johan Hedberg , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Jakub Kicinski Subject: [RFC PATCH v4 3/5] Bluetooth: Handle BR/EDR devices during suspend Date: Tue, 3 Mar 2020 17:06:48 -0800 Message-Id: <20200303170610.RFC.v4.3.Icc7c35e1cabf10f8a383a009694987520f1d1b35@changeid> X-Mailer: git-send-email 2.25.0.265.gbab2e86ba0-goog In-Reply-To: <20200304010650.259961-1-abhishekpandit@chromium.org> References: <20200304010650.259961-1-abhishekpandit@chromium.org> MIME-Version: 1.0 Sender: linux-bluetooth-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org To handle BR/EDR devices, we first disable page scan and disconnect all connected devices. Once that is complete, we add event filters (for devices that can wake the system) and re-enable page scan. Signed-off-by: Abhishek Pandit-Subedi --- Changes in v4: None Changes in v3: * Refactored to only handle BR/EDR devices Changes in v2: * Refactored filters and whitelist settings to its own patch * Refactored update_white_list to have clearer edge cases * Add connected devices to whitelist (previously missing corner case) include/net/bluetooth/hci.h | 17 ++++-- include/net/bluetooth/hci_core.h | 9 ++- net/bluetooth/hci_core.c | 21 ++++++- net/bluetooth/hci_event.c | 24 ++++++++ net/bluetooth/hci_request.c | 101 +++++++++++++++++++++++++++++++ 5 files changed, 162 insertions(+), 10 deletions(-) diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h index 0b3ebd35681d..414f91dec221 100644 --- a/include/net/bluetooth/hci.h +++ b/include/net/bluetooth/hci.h @@ -941,10 +941,14 @@ struct hci_cp_sniff_subrate { #define HCI_OP_RESET 0x0c03 #define HCI_OP_SET_EVENT_FLT 0x0c05 -struct hci_cp_set_event_flt { - __u8 flt_type; - __u8 cond_type; - __u8 condition[]; +#define HCI_SET_EVENT_FLT_SIZE 9 +struct hci_cp_set_event_filter { + __u8 flt_type; + __u8 cond_type; + struct { + bdaddr_t bdaddr; + __u8 auto_accept; + } __packed addr_conn_flt; } __packed; /* Filter types */ @@ -958,8 +962,9 @@ struct hci_cp_set_event_flt { #define HCI_CONN_SETUP_ALLOW_BDADDR 0x02 /* CONN_SETUP Conditions */ -#define HCI_CONN_SETUP_AUTO_OFF 0x01 -#define HCI_CONN_SETUP_AUTO_ON 0x02 +#define HCI_CONN_SETUP_AUTO_OFF 0x01 +#define HCI_CONN_SETUP_AUTO_ON 0x02 +#define HCI_CONN_SETUP_AUTO_ON_WITH_RS 0x03 #define HCI_OP_READ_STORED_LINK_KEY 0x0c0d struct hci_cp_read_stored_link_key { diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h index b82a89b88d1b..4eb5b2786048 100644 --- a/include/net/bluetooth/hci_core.h +++ b/include/net/bluetooth/hci_core.h @@ -91,6 +91,10 @@ struct discovery_state { #define SUSPEND_NOTIFIER_TIMEOUT msecs_to_jiffies(2000) /* 2 seconds */ enum suspend_tasks { + SUSPEND_SCAN_DISABLE, + SUSPEND_SCAN_ENABLE, + SUSPEND_DISCONNECTING, + SUSPEND_POWERING_DOWN, SUSPEND_PREPARE_NOTIFIER, @@ -99,7 +103,8 @@ enum suspend_tasks { enum suspended_state { BT_RUNNING = 0, - BT_SUSPENDED, + BT_SUSPEND_DISCONNECT, + BT_SUSPEND_COMPLETE, }; struct hci_conn_hash { @@ -408,6 +413,8 @@ struct hci_dev { struct work_struct suspend_prepare; enum suspended_state suspend_state_next; enum suspended_state suspend_state; + bool scanning_paused; + bool suspended; wait_queue_head_t suspend_wait_q; DECLARE_BITMAP(suspend_tasks, __SUSPEND_NUM_TASKS); diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index ad89ff3f8f57..72e53fde2a74 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -3302,16 +3302,31 @@ static int hci_suspend_notifier(struct notifier_block *nb, unsigned long action, goto done; if (action == PM_SUSPEND_PREPARE) { - hdev->suspend_state_next = BT_SUSPENDED; + /* Suspend consists of two actions: + * - First, disconnect everything and make the controller not + * connectable (disabling scanning) + * - Second, program event filter/whitelist and enable scan + */ + hdev->suspend_state_next = BT_SUSPEND_DISCONNECT; set_bit(SUSPEND_PREPARE_NOTIFIER, hdev->suspend_tasks); queue_work(hdev->req_workqueue, &hdev->suspend_prepare); - ret = hci_suspend_wait_event(hdev); + + /* If the disconnect portion failed, don't attempt to complete + * by configuring the whitelist. The suspend notifier will + * follow a cancelled suspend with a PM_POST_SUSPEND + * notification. + */ + if (!ret) { + hdev->suspend_state_next = BT_SUSPEND_COMPLETE; + set_bit(SUSPEND_PREPARE_NOTIFIER, hdev->suspend_tasks); + queue_work(hdev->req_workqueue, &hdev->suspend_prepare); + ret = hci_suspend_wait_event(hdev); + } } else if (action == PM_POST_SUSPEND) { hdev->suspend_state_next = BT_RUNNING; set_bit(SUSPEND_PREPARE_NOTIFIER, hdev->suspend_tasks); queue_work(hdev->req_workqueue, &hdev->suspend_prepare); - ret = hci_suspend_wait_event(hdev); } diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c index 591e7477e925..e3c36230f705 100644 --- a/net/bluetooth/hci_event.c +++ b/net/bluetooth/hci_event.c @@ -2474,6 +2474,7 @@ static void hci_inquiry_result_evt(struct hci_dev *hdev, struct sk_buff *skb) static void hci_conn_complete_evt(struct hci_dev *hdev, struct sk_buff *skb) { struct hci_ev_conn_complete *ev = (void *) skb->data; + struct inquiry_entry *ie; struct hci_conn *conn; BT_DBG("%s", hdev->name); @@ -2482,6 +2483,21 @@ static void hci_conn_complete_evt(struct hci_dev *hdev, struct sk_buff *skb) conn = hci_conn_hash_lookup_ba(hdev, ev->link_type, &ev->bdaddr); if (!conn) { + /* Connection may not exist if auto-connected. Check the inquiry + * cache to see if we've already discovered this bdaddr before. + * If found and link is an ACL type, create a connection class + * automatically. + */ + ie = hci_inquiry_cache_lookup(hdev, &ev->bdaddr); + if (ie && ev->link_type == ACL_LINK) { + conn = hci_conn_add(hdev, ev->link_type, &ev->bdaddr, + HCI_ROLE_SLAVE); + if (!conn) { + bt_dev_err(hdev, "no memory for new conn"); + goto unlock; + } + } + if (ev->link_type != SCO_LINK) goto unlock; @@ -2743,6 +2759,14 @@ static void hci_disconn_complete_evt(struct hci_dev *hdev, struct sk_buff *skb) hci_disconn_cfm(conn, ev->reason); hci_conn_del(conn); + /* The suspend notifier is waiting for all devices to disconnect so + * clear the bit from pending tasks and inform the wait queue. + */ + if (list_empty(&hdev->conn_hash.list) && + test_and_clear_bit(SUSPEND_DISCONNECTING, hdev->suspend_tasks)) { + wake_up(&hdev->suspend_wait_q); + } + /* Re-enable advertising if necessary, since it might * have been disabled by the connection. From the * HCI_LE_Set_Advertise_Enable command description in diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c index 08908469c043..4d67b1d08608 100644 --- a/net/bluetooth/hci_request.c +++ b/net/bluetooth/hci_request.c @@ -918,12 +918,62 @@ static u8 get_adv_instance_scan_rsp_len(struct hci_dev *hdev, u8 instance) return adv_instance->scan_rsp_len; } +static void hci_req_clear_event_filter(struct hci_request *req) +{ + struct hci_cp_set_event_filter f; + + memset(&f, 0, sizeof(f)); + f.flt_type = HCI_FLT_CLEAR_ALL; + hci_req_add(req, HCI_OP_SET_EVENT_FLT, 1, &f); + + /* Update page scan state (since we may have modified it when setting + * the event filter). + */ + __hci_req_update_scan(req); +} + +static void hci_req_set_event_filter(struct hci_request *req) +{ + struct bdaddr_list *b; + struct hci_cp_set_event_filter f; + struct hci_dev *hdev = req->hdev; + u8 scan; + + /* Always clear event filter when starting */ + hci_req_clear_event_filter(req); + + list_for_each_entry(b, &hdev->wakeable, list) { + memset(&f, 0, sizeof(f)); + bacpy(&f.addr_conn_flt.bdaddr, &b->bdaddr); + f.flt_type = HCI_FLT_CONN_SETUP; + f.cond_type = HCI_CONN_SETUP_ALLOW_BDADDR; + f.addr_conn_flt.auto_accept = HCI_CONN_SETUP_AUTO_ON; + + BT_DBG("Adding event filters for %pMR", &b->bdaddr); + hci_req_add(req, HCI_OP_SET_EVENT_FLT, sizeof(f), &f); + } + + scan = !list_empty(&hdev->wakeable) ? SCAN_PAGE : SCAN_DISABLED; + hci_req_add(req, HCI_OP_WRITE_SCAN_ENABLE, 1, &scan); +} + +static void suspend_req_complete(struct hci_dev *hdev, u8 status, u16 opcode) +{ + BT_DBG("Request complete opcode=0x%x, status=0x%x", opcode, status); + if (test_and_clear_bit(SUSPEND_SCAN_ENABLE, hdev->suspend_tasks) || + test_and_clear_bit(SUSPEND_SCAN_DISABLE, hdev->suspend_tasks)) { + wake_up(&hdev->suspend_wait_q); + } +} + /* Call with hci_dev_lock */ void hci_req_prepare_suspend(struct hci_dev *hdev, enum suspended_state next) { int old_state; struct hci_conn *conn; struct hci_request req; + u8 page_scan; + int disconnect_counter; if (next == hdev->suspend_state) { BT_DBG("Same state before and after: %d", next); @@ -931,6 +981,54 @@ void hci_req_prepare_suspend(struct hci_dev *hdev, enum suspended_state next) } hdev->suspend_state = next; + hci_req_init(&req, hdev); + + if (next == BT_SUSPEND_DISCONNECT) { + /* Mark device as suspended */ + hdev->suspended = true; + + /* Disable page scan */ + page_scan = SCAN_DISABLED; + hci_req_add(&req, HCI_OP_WRITE_SCAN_ENABLE, 1, &page_scan); + + /* Mark task needing completion */ + set_bit(SUSPEND_SCAN_DISABLE, hdev->suspend_tasks); + + /* Prevent disconnects from causing scanning to be re-enabled */ + hdev->scanning_paused = true; + + /* Run commands before disconnecting */ + hci_req_run(&req, suspend_req_complete); + + disconnect_counter = 0; + /* Soft disconnect everything (power off) */ + list_for_each_entry(conn, &hdev->conn_hash.list, list) { + hci_disconnect(conn, HCI_ERROR_REMOTE_POWER_OFF); + disconnect_counter++; + } + + if (disconnect_counter > 0) { + BT_DBG("Had %d disconnects. Will wait on them", + disconnect_counter); + set_bit(SUSPEND_DISCONNECTING, hdev->suspend_tasks); + } + } else if (next == BT_SUSPEND_COMPLETE) { + /* Unpause to take care of updating scanning params */ + hdev->scanning_paused = false; + /* Enable event filter for paired devices */ + hci_req_set_event_filter(&req); + /* Pause scan changes again. */ + hdev->scanning_paused = true; + hci_req_run(&req, suspend_req_complete); + } else { + hdev->suspended = false; + hdev->scanning_paused = false; + + hci_req_clear_event_filter(&req); + hci_req_run(&req, suspend_req_complete); + } + + hdev->suspend_state = next; done: clear_bit(SUSPEND_PREPARE_NOTIFIER, hdev->suspend_tasks); @@ -2034,6 +2132,9 @@ void __hci_req_update_scan(struct hci_request *req) if (mgmt_powering_down(hdev)) return; + if (hdev->scanning_paused) + return; + if (hci_dev_test_flag(hdev, HCI_CONNECTABLE) || disconnected_whitelist_entries(hdev)) scan = SCAN_PAGE;