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Date: Tue, 15 Dec 2020 16:32:00 +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 v2 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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