Add devcoredump support for vhci that creates forcce_devcoredump debugfs
entry. This is used for mgmt-tester tests.
Signed-off-by: Manish Mandlik <mmandlik@xxxxxxxxxx>
---
Changes in v12:
- Rename force_devcoredump_write() to force_devcd_write()
- Update force_devcd_write() to handle coredump state and timeout
Changes in v9:
- Rename hci_devcoredump_*() to hci_devcd_*()
Changes in v8:
- Update vhci_coredump_hdr() to use skb
Changes in v7:
- New patch in the series
drivers/bluetooth/Kconfig | 1 +
drivers/bluetooth/hci_vhci.c | 89 ++++++++++++++++++++++++++++++++++++
2 files changed, 90 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..3aaf9a64ffe9 100644
--- a/drivers/bluetooth/hci_vhci.c
+++ b/drivers/bluetooth/hci_vhci.c
@@ -278,6 +278,92 @@ 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 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)
+ hdev->dump.timeout = msecs_to_jiffies(dump_data.timeout * 1000);
+
+ 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 +441,9 @@ 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);
--
2.40.0.348.gf938b09366-goog
