linux-kernel - [PATCH v4 4/5] Bluetooth: btusb: Add btusb devcoredump support

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Message-Id: <20220809083112.v4.4.Id0d6e772f00432d55f6bcbf68a50cb4ad89396c6@changeid>
Date:   Tue,  9 Aug 2022 08:35:26 -0700
From:   Manish Mandlik <mmandlik@...gle.com>
To:     Arend van Spriel <aspriel@...il.com>, marcel@...tmann.org,
        luiz.dentz@...il.com
Cc:     chromeos-bluetooth-upstreaming@...omium.org,
        linux-bluetooth@...r.kernel.org,
        Manish Mandlik <mmandlik@...gle.com>,
        Abhishek Pandit-Subedi <abhishekpandit@...omium.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 4/5] Bluetooth: btusb: Add btusb devcoredump support

This patch implements the btusb driver side .coredump() callback to
trigger a devcoredump via sysfs and .enable_coredump() callback to
check if the devcoredump functionality is enabled for a device.

Signed-off-by: Manish Mandlik <mmandlik@...gle.com>
Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
---

Changes in v4:
- New patch in the series

 drivers/bluetooth/btusb.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 30dd443f395f..b00851327aa3 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -1510,6 +1510,15 @@ static void btusb_isoc_tx_complete(struct urb *urb)
 	kfree_skb(skb);
 }
 
+#ifdef CONFIG_DEV_COREDUMP
+static bool btusb_coredump_enabled(struct hci_dev *hdev)
+{
+	struct btusb_data *data = hci_get_drvdata(hdev);
+
+	return !data->intf->dev.coredump_disabled;
+}
+#endif
+
 static int btusb_open(struct hci_dev *hdev)
 {
 	struct btusb_data *data = hci_get_drvdata(hdev);
@@ -3765,6 +3774,9 @@ static int btusb_probe(struct usb_interface *intf,
 	hdev->send   = btusb_send_frame;
 	hdev->notify = btusb_notify;
 	hdev->wakeup = btusb_wakeup;
+#ifdef CONFIG_DEV_COREDUMP
+	hdev->dump.enabled = btusb_coredump_enabled;
+#endif
 
 #ifdef CONFIG_PM
 	err = btusb_config_oob_wake(hdev);
@@ -4180,6 +4192,17 @@ static int btusb_resume(struct usb_interface *intf)
 }
 #endif
 
+#ifdef CONFIG_DEV_COREDUMP
+static void btusb_coredump(struct device *dev)
+{
+	struct btusb_data *data = dev_get_drvdata(dev);
+	struct hci_dev *hdev = data->hdev;
+
+	if (!dev->coredump_disabled && hdev->dump.coredump)
+		hdev->dump.coredump(hdev);
+}
+#endif
+
 static struct usb_driver btusb_driver = {
 	.name		= "btusb",
 	.probe		= btusb_probe,
@@ -4191,6 +4214,14 @@ static struct usb_driver btusb_driver = {
 	.id_table	= btusb_table,
 	.supports_autosuspend = 1,
 	.disable_hub_initiated_lpm = 1,
+
+#ifdef CONFIG_DEV_COREDUMP
+	.drvwrap = {
+		.driver = {
+			.coredump = btusb_coredump,
+		},
+	},
+#endif
 };
 
 module_usb_driver(btusb_driver);
-- 
2.37.1.559.g78731f0fdb-goog