commit a5022a793e479a11c053043de1c1193bd4fc0f25
author Manish Mandlik <mmandlik@google.com> Thu Jul 14 01:27:35 2022 -0700
committer Chromeos LUCI <chromeos-scoped@luci-project-accounts.iam.gserviceaccount.com> Tue Aug 16 03:12:47 2022 +0000
tree 16634aa107e7e09d425252e626a7bb44d29a7646
parent b09b3692fdd142ea7948027d29330b04ecc69038

FROMLIST: 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@google.com>
Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
(am from https://patchwork.kernel.org/patch/12940742)

BUG=b:154867197
TEST=Verify that the coredump and coredump_disabled sysfs entry is
     available in /sys/class/bluetooth/hci0/device

Change-Id: Id0d6e772f00432d55f6bcbf68a50cb4ad89396c6
Signed-off-by: Manish Mandlik <mmandlik@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/3763751
Tested-by: Manish Mandlik <mmandlik@chromium.org>
Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@google.com>
Reviewed-by: Sean Paul <sean@poorly.run>
Commit-Queue: Manish Mandlik <mmandlik@chromium.org>

drivers/bluetooth/btusb.c

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 6b84ad4..858f71e6 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -1422,6 +1422,15 @@
 	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);
@@ -3616,6 +3625,9 @@
 	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);
@@ -4036,6 +4048,17 @@
 }
 #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,
@@ -4047,6 +4070,14 @@
 	.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);