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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@google.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Manish Mandlik 2023-03-30 09:58:24 -07:00 committed by Luiz Augusto von Dentz
parent 9695ef876f
commit ab4e4380d4
2 changed files with 98 additions and 0 deletions
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1
drivers/bluetooth/Kconfig
View File

@ -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.

97
drivers/bluetooth/hci_vhci.c
View File

@ -278,6 +278,100 @@ static int vhci_setup(struct hci_dev *hdev)
return 0;
}
static void vhci_coredump(struct hci_dev *hdev)
{
/* No need to do anything */
}
static void vhci_coredump_hdr(struct hci_dev *hdev, struct sk_buff *skb)
{
char buf[80];
snprintf(buf, sizeof(buf), "Controller Name: vhci_ctrl\n");
skb_put_data(skb, buf, strlen(buf));
snprintf(buf, sizeof(buf), "Firmware Version: vhci_fw\n");
skb_put_data(skb, buf, strlen(buf));
snprintf(buf, sizeof(buf), "Driver: vhci_drv\n");
skb_put_data(skb, buf, strlen(buf));
snprintf(buf, sizeof(buf), "Vendor: vhci\n");
skb_put_data(skb, buf, strlen(buf));
}
#define MAX_COREDUMP_LINE_LEN 40
struct devcoredump_test_data {
enum devcoredump_state state;
unsigned int timeout;
char data[MAX_COREDUMP_LINE_LEN];
};
static inline void force_devcd_timeout(struct hci_dev *hdev,
unsigned int timeout)
{
#ifdef CONFIG_DEV_COREDUMP
hdev->dump.timeout = msecs_to_jiffies(timeout * 1000);
#endif
}
static ssize_t force_devcd_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;
struct devcoredump_test_data dump_data;
int ret;
ret = simple_write_to_buffer(&dump_data, sizeof(dump_data), ppos,
user_buf, count);
if (ret < count)
return ret;
skb = alloc_skb(sizeof(dump_data.data), GFP_ATOMIC);
if (!skb)
return -ENOMEM;
skb_put_data(skb, &dump_data.data, sizeof(dump_data.data));
hci_devcd_register(hdev, vhci_coredump, vhci_coredump_hdr, NULL);
/* Force the devcoredump timeout */
if (dump_data.timeout)
force_devcd_timeout(hdev, dump_data.timeout);
ret = hci_devcd_init(hdev, skb->len);
if (ret) {
BT_ERR("Failed to generate devcoredump");
kfree_skb(skb);
return ret;
}
hci_devcd_append(hdev, skb);
switch (dump_data.state) {
case HCI_DEVCOREDUMP_DONE:
hci_devcd_complete(hdev);
break;
case HCI_DEVCOREDUMP_ABORT:
hci_devcd_abort(hdev);
break;
case HCI_DEVCOREDUMP_TIMEOUT:
/* Do nothing */
break;
default:
return -EINVAL;
}
return count;
}
static const struct file_operations force_devcoredump_fops = {
.open = simple_open,
.write = force_devcd_write,
};
static int __vhci_create_device(struct vhci_data *data, __u8 opcode)
{
struct hci_dev *hdev;
@ -355,6 +449,9 @@ 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);