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Date:   Wed, 16 Dec 2020 12:33:34 +0800
From:   Archie Pusaka <apusaka@...gle.com>
To:     linux-bluetooth <linux-bluetooth@...r.kernel.org>,
        Marcel Holtmann <marcel@...tmann.org>
Cc:     CrosBT Upstreaming <chromeos-bluetooth-upstreaming@...omium.org>,
        Archie Pusaka <apusaka@...omium.org>,
        Miao-chen Chou <mcchou@...omium.org>,
        Yun-Hao Chung <howardchung@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH v3 4/5] Bluetooth: advmon offload MSFT handle controller reset

From: Archie Pusaka <apusaka@...omium.org>

When the controller is powered off, the registered advertising monitor
is removed from the controller. This patch handles the re-registration
of those monitors when the power is on.

Signed-off-by: Archie Pusaka <apusaka@...omium.org>
Reviewed-by: Miao-chen Chou <mcchou@...omium.org>
Reviewed-by: Yun-Hao Chung <howardchung@...gle.com>

---

(no changes since v1)

 net/bluetooth/msft.c | 79 +++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 74 insertions(+), 5 deletions(-)

diff --git a/net/bluetooth/msft.c b/net/bluetooth/msft.c
index f5aa0e3b1b9b..7e33a85c3f1c 100644
--- a/net/bluetooth/msft.c
+++ b/net/bluetooth/msft.c
@@ -82,8 +82,15 @@ struct msft_data {
 	struct list_head handle_map;
 	__u16 pending_add_handle;
 	__u16 pending_remove_handle;
+
+	struct {
+		u8 reregistering:1;
+	} flags;
 };
 
+static int __msft_add_monitor_pattern(struct hci_dev *hdev,
+				      struct adv_monitor *monitor);
+
 bool msft_monitor_supported(struct hci_dev *hdev)
 {
 	return !!(msft_get_features(hdev) & MSFT_FEATURE_MASK_LE_ADV_MONITOR);
@@ -134,6 +141,35 @@ static bool read_supported_features(struct hci_dev *hdev,
 	return false;
 }
 
+/* This function requires the caller holds hdev->lock */
+static void reregister_monitor_on_restart(struct hci_dev *hdev, int handle)
+{
+	struct adv_monitor *monitor;
+	struct msft_data *msft = hdev->msft_data;
+	int err;
+
+	while (1) {
+		monitor = idr_get_next(&hdev->adv_monitors_idr, &handle);
+		if (!monitor) {
+			/* All monitors have been reregistered */
+			msft->flags.reregistering = false;
+			hci_update_background_scan(hdev);
+			return;
+		}
+
+		msft->pending_add_handle = (u16)handle;
+		err = __msft_add_monitor_pattern(hdev, monitor);
+
+		/* If success, we return and wait for monitor added callback */
+		if (!err)
+			return;
+
+		/* Otherwise remove the monitor and keep registering */
+		hci_free_adv_monitor(hdev, monitor);
+		handle++;
+	}
+}
+
 void msft_do_open(struct hci_dev *hdev)
 {
 	struct msft_data *msft;
@@ -154,12 +190,18 @@ void msft_do_open(struct hci_dev *hdev)
 
 	INIT_LIST_HEAD(&msft->handle_map);
 	hdev->msft_data = msft;
+
+	if (msft_monitor_supported(hdev)) {
+		msft->flags.reregistering = true;
+		reregister_monitor_on_restart(hdev, 0);
+	}
 }
 
 void msft_do_close(struct hci_dev *hdev)
 {
 	struct msft_data *msft = hdev->msft_data;
 	struct msft_monitor_advertisement_handle_data *handle_data, *tmp;
+	struct adv_monitor *monitor;
 
 	if (!msft)
 		return;
@@ -169,6 +211,12 @@ void msft_do_close(struct hci_dev *hdev)
 	hdev->msft_data = NULL;
 
 	list_for_each_entry_safe(handle_data, tmp, &msft->handle_map, list) {
+		monitor = idr_find(&hdev->adv_monitors_idr,
+				   handle_data->mgmt_handle);
+
+		if (monitor && monitor->state == ADV_MONITOR_STATE_OFFLOADED)
+			monitor->state = ADV_MONITOR_STATE_REGISTERED;
+
 		list_del(&handle_data->list);
 		kfree(handle_data);
 	}
@@ -282,9 +330,15 @@ static void msft_le_monitor_advertisement_cb(struct hci_dev *hdev,
 	if (status && monitor)
 		hci_free_adv_monitor(hdev, monitor);
 
+	/* If in restart/reregister sequence, keep registering. */
+	if (msft->flags.reregistering)
+		reregister_monitor_on_restart(hdev,
+					      msft->pending_add_handle + 1);
+
 	hci_dev_unlock(hdev);
 
-	hci_add_adv_patterns_monitor_complete(hdev, status);
+	if (!msft->flags.reregistering)
+		hci_add_adv_patterns_monitor_complete(hdev, status);
 }
 
 static void msft_le_cancel_monitor_advertisement_cb(struct hci_dev *hdev,
@@ -374,7 +428,8 @@ static bool msft_monitor_pattern_valid(struct adv_monitor *monitor)
 }
 
 /* This function requires the caller holds hdev->lock */
-int msft_add_monitor_pattern(struct hci_dev *hdev, struct adv_monitor *monitor)
+static int __msft_add_monitor_pattern(struct hci_dev *hdev,
+				      struct adv_monitor *monitor)
 {
 	struct msft_cp_le_monitor_advertisement *cp;
 	struct msft_le_monitor_advertisement_pattern_data *pattern_data;
@@ -387,9 +442,6 @@ int msft_add_monitor_pattern(struct hci_dev *hdev, struct adv_monitor *monitor)
 	u8 pattern_count = 0;
 	int err = 0;
 
-	if (!msft)
-		return -EOPNOTSUPP;
-
 	if (!msft_monitor_pattern_valid(monitor))
 		return -EINVAL;
 
@@ -434,6 +486,20 @@ int msft_add_monitor_pattern(struct hci_dev *hdev, struct adv_monitor *monitor)
 	return err;
 }
 
+/* This function requires the caller holds hdev->lock */
+int msft_add_monitor_pattern(struct hci_dev *hdev, struct adv_monitor *monitor)
+{
+	struct msft_data *msft = hdev->msft_data;
+
+	if (!msft)
+		return -EOPNOTSUPP;
+
+	if (msft->flags.reregistering)
+		return -EBUSY;
+
+	return __msft_add_monitor_pattern(hdev, monitor);
+}
+
 /* This function requires the caller holds hdev->lock */
 int msft_remove_monitor(struct hci_dev *hdev, struct adv_monitor *monitor,
 			u16 handle)
@@ -447,6 +513,9 @@ int msft_remove_monitor(struct hci_dev *hdev, struct adv_monitor *monitor,
 	if (!msft)
 		return -EOPNOTSUPP;
 
+	if (msft->flags.reregistering)
+		return -EBUSY;
+
 	handle_data = msft_find_handle_data(hdev, monitor->handle, true);
 
 	/* If no matched handle, just remove without telling controller */
-- 
2.29.2.684.gfbc64c5ab5-goog

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