Bluetooth: btmrvl add firmware dump support

This patch adds firmware dump support for marvell
bluetooth chipset. Currently only SD8897 is supported.
This is implemented based on dev_coredump, a new mechnism
introduced in kernel 3.18rc3

Firmware dump can be trigger by
echo 1 > /sys/kernel/debug/bluetooth/hci*/config/fw_dump
and when the dump operation is completed, data can be read by
cat /sys/class/devcoredump/devcd*/data

We have prepared following script to divide fw memory
dump data into multiple files based on memory type.

 [root]# cat btmrvl_split_dump_data.sh
 #!/bin/bash
 # usage: ./btmrvl_split_dump_data.sh dump_data

 fw_dump_data=$1

 mem_type="ITCM DTCM SQRAM APU CIU ICU MAC EXT7 EXT8 EXT9 EXT10 EXT11 EXT12 EXT13 EXTLAST"

 for name in ${mem_type[@]}
 do
         sed -n "/Start dump $name/,/End dump/p" $fw_dump_data  > tmp.$name.log
         if [ ! -s tmp.$name.log ]
                 then
                         rm -rf tmp.$name.log
                 else
                         # Remove the describle info "Start dump" and "End dump"
                         sed '1d' tmp.$name.log | sed '$d' > /data/$name.log
                         if [ -s /data/$name.log ]
                         then
                                 echo "generate /data/$name.log"
                         else
                                 sed '1d' tmp.$name.log | sed '$d' > /var/$name.log
                                 echo "generate /var/$name.log"
                         fi
                         rm -rf tmp.$name.log
         fi
 done

Signed-off-by: Xinming Hu <huxm@marvell.com>
Signed-off-by: Cathy Luo <cluo@marvell.com>
Signed-off-by: Avinash Patil <patila@marvell.com>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Reviewed-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 31 insertions, 0 deletions

diff --git a/drivers/bluetooth/btmrvl_debugfs.c b/drivers/bluetooth/btmrvl_debugfs.c
index 023d35e3c7a7..1828ed8cae7a 100644
--- a/drivers/bluetooth/btmrvl_debugfs.c
+++ b/drivers/bluetooth/btmrvl_debugfs.c
@@ -167,6 +167,35 @@ static const struct file_operations btmrvl_hscmd_fops = {
 	.llseek = default_llseek,
 };
 
+static ssize_t btmrvl_fwdump_write(struct file *file, const char __user *ubuf,
+				   size_t count, loff_t *ppos)
+{
+	struct btmrvl_private *priv = file->private_data;
+	char buf[16];
+	bool result;
+
+	memset(buf, 0, sizeof(buf));
+
+	if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
+		return -EFAULT;
+
+	if (strtobool(buf, &result))
+		return -EINVAL;
+
+	if (!result)
+		return -EINVAL;
+
+	btmrvl_firmware_dump(priv);
+
+	return count;
+}
+
+static const struct file_operations btmrvl_fwdump_fops = {
+	.write	= btmrvl_fwdump_write,
+	.open	= simple_open,
+	.llseek = default_llseek,
+};
+
 void btmrvl_debugfs_init(struct hci_dev *hdev)
 {
 	struct btmrvl_private *priv = hci_get_drvdata(hdev);
@@ -197,6 +226,8 @@ void btmrvl_debugfs_init(struct hci_dev *hdev)
 			    priv, &btmrvl_hscmd_fops);
 	debugfs_create_file("hscfgcmd", 0644, dbg->config_dir,
 			    priv, &btmrvl_hscfgcmd_fops);
+	debugfs_create_file("fw_dump", 0200, dbg->config_dir,
+			    priv, &btmrvl_fwdump_fops);
 
 	dbg->status_dir = debugfs_create_dir("status", hdev->debugfs);
 	debugfs_create_u8("curpsmode", 0444, dbg->status_dir,