linux-kernel - [PATCH v7 2/4] Bluetooth: Add vhci devcoredump support

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Message-ID: <20230302151413.v7.2.Ief9a81a3643d2291f6db2b3695c3a6e0159467dc@changeid>
Date:   Thu,  2 Mar 2023 15:15:45 -0800
From:   Manish Mandlik <mmandlik@...gle.com>
To:     marcel@...tmann.org, luiz.dentz@...il.com
Cc:     chromeos-bluetooth-upstreaming@...omium.org,
        linux-bluetooth@...r.kernel.org,
        Manish Mandlik <mmandlik@...gle.com>,
        Johan Hedberg <johan.hedberg@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v7 2/4] Bluetooth: Add vhci devcoredump support

Add devcoredump support for vhci that creates forcce_devcoredump debugfs
entry. This is used for mgmt-tester tests.

Signed-off-by: Manish Mandlik <mmandlik@...gle.com>
---

Changes in v7:
- New patch in the series

 drivers/bluetooth/Kconfig    |  1 +
 drivers/bluetooth/hci_vhci.c | 72 ++++++++++++++++++++++++++++++++++++
 2 files changed, 73 insertions(+)

diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
index 5a1a7bec3c42..7bc7a765ad69 100644
--- a/drivers/bluetooth/Kconfig
+++ b/drivers/bluetooth/Kconfig
@@ -363,6 +363,7 @@ config BT_HCIBLUECARD
 
 config BT_HCIVHCI
 	tristate "HCI VHCI (Virtual HCI device) driver"
+	select WANT_DEV_COREDUMP
 	help
 	  Bluetooth Virtual HCI device driver.
 	  This driver is required if you want to use HCI Emulation software.
diff --git a/drivers/bluetooth/hci_vhci.c b/drivers/bluetooth/hci_vhci.c
index c443c3b0a4da..8a74e66f8b8e 100644
--- a/drivers/bluetooth/hci_vhci.c
+++ b/drivers/bluetooth/hci_vhci.c
@@ -278,6 +278,75 @@ static int vhci_setup(struct hci_dev *hdev)
 	return 0;
 }
 
+static void vhci_coredump(struct hci_dev *hdev)
+{
+	/* No need to do anything */
+}
+
+static int vhci_coredump_hdr(struct hci_dev *hdev, char *buf, size_t size)
+{
+	char *ptr = buf;
+	size_t rem = size;
+	size_t read = 0;
+
+	read = snprintf(ptr, rem, "Controller Name: vhci_ctrl\n");
+	rem -= read;
+	ptr += read;
+
+	read = snprintf(ptr, rem, "Firmware Version: vhci_fw\n");
+	rem -= read;
+	ptr += read;
+
+	read = snprintf(ptr, rem, "Driver: vhci_drv\n");
+	rem -= read;
+	ptr += read;
+
+	read = snprintf(ptr, rem, "Vendor: vhci\n");
+	rem -= read;
+	ptr += read;
+
+	return size - rem;
+}
+
+static ssize_t force_devcoredump_write(struct file *file,
+				       const char __user *user_buf,
+				       size_t count, loff_t *ppos)
+{
+	struct vhci_data *data = file->private_data;
+	struct hci_dev *hdev = data->hdev;
+	struct sk_buff *skb = NULL;
+	char buf[512];
+	int ret;
+
+	ret = simple_write_to_buffer(&buf, sizeof(buf), ppos, user_buf, count);
+	if (ret < count)
+		return ret;
+
+	skb = alloc_skb(count, GFP_ATOMIC);
+	if (!skb)
+		return -ENOMEM;
+	skb_put_data(skb, &buf, count);
+
+	hci_devcoredump_register(hdev, vhci_coredump, vhci_coredump_hdr, NULL);
+
+	ret = hci_devcoredump_init(hdev, skb->len);
+	if (ret) {
+		BT_ERR("Failed to generate devcoredump");
+		kfree_skb(skb);
+		return ret;
+	}
+
+	hci_devcoredump_append(hdev, skb);
+	hci_devcoredump_complete(hdev);
+
+	return count;
+}
+
+static const struct file_operations force_devcoredump_fops = {
+	.open		= simple_open,
+	.write		= force_devcoredump_write,
+};
+
 static int __vhci_create_device(struct vhci_data *data, __u8 opcode)
 {
 	struct hci_dev *hdev;
@@ -355,6 +424,9 @@ static int __vhci_create_device(struct vhci_data *data, __u8 opcode)
 		debugfs_create_file("aosp_capable", 0644, hdev->debugfs, data,
 				    &aosp_capable_fops);
 
+	debugfs_create_file("force_devcoredump", 0644, hdev->debugfs, data,
+			    &force_devcoredump_fops);
+
 	hci_skb_pkt_type(skb) = HCI_VENDOR_PKT;
 
 	skb_put_u8(skb, 0xff);
-- 
2.40.0.rc0.216.gc4246ad0f0-goog