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 <[email protected]>
Signed-off-by: Cathy Luo <[email protected]>
Signed-off-by: Avinash Patil <[email protected]>
Reviewed-by: Johannes Berg <[email protected]>
Reviewed-by: Marcel Holtmann <[email protected]>
Signed-off-by: Amitkumar Karwar <[email protected]>
Signed-off-by: Marcel Holtmann <[email protected]>

drivers/bluetooth/Kconfig

@@ -210,6 +210,7 @@ config BT_MRVL_SDIO
 	tristate "Marvell BT-over-SDIO driver"
 	depends on BT_MRVL && MMC
 	select FW_LOADER
+	select WANT_DEV_COREDUMP
 	help
 	  The driver for Marvell Bluetooth chipsets with SDIO interface.
 

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,

drivers/bluetooth/btmrvl_drv.h

@@ -32,6 +32,24 @@
 /* Time to wait for command response in millisecond */
 #define WAIT_UNTIL_CMD_RESP		5000
 
+enum rdwr_status {
+	RDWR_STATUS_SUCCESS = 0,
+	RDWR_STATUS_FAILURE = 1,
+	RDWR_STATUS_DONE = 2
+};
+
+#define FW_DUMP_MAX_NAME_LEN    8
+#define FW_DUMP_HOST_READY      0xEE
+#define FW_DUMP_DONE            0xFF
+#define FW_DUMP_READ_DONE       0xFE
+
+struct memory_type_mapping {
+	u8 mem_name[FW_DUMP_MAX_NAME_LEN];
+	u8 *mem_ptr;
+	u32 mem_size;
+	u8 done_flag;
+};
+
 struct btmrvl_thread {
 	struct task_struct *task;
 	wait_queue_head_t wait_q;
@@ -81,6 +99,7 @@ struct btmrvl_private {
 				u8 *payload, u16 nb);
 	int (*hw_wakeup_firmware) (struct btmrvl_private *priv);
 	int (*hw_process_int_status) (struct btmrvl_private *priv);
+	void (*firmware_dump)(struct btmrvl_private *priv);
 	spinlock_t driver_lock;		/* spinlock used by driver */
 #ifdef CONFIG_DEBUG_FS
 	void *debugfs_data;
@@ -151,6 +170,7 @@ int btmrvl_send_hscfg_cmd(struct btmrvl_private *priv);
 int btmrvl_enable_ps(struct btmrvl_private *priv);
 int btmrvl_prepare_command(struct btmrvl_private *priv);
 int btmrvl_enable_hs(struct btmrvl_private *priv);
+void btmrvl_firmware_dump(struct btmrvl_private *priv);
 
 #ifdef CONFIG_DEBUG_FS
 void btmrvl_debugfs_init(struct hci_dev *hdev);

drivers/bluetooth/btmrvl_main.c

@@ -22,6 +22,7 @@
 #include <linux/of.h>
 #include <net/bluetooth/bluetooth.h>
 #include <net/bluetooth/hci_core.h>
+#include <linux/mmc/sdio_func.h>
 
 #include "btmrvl_drv.h"
 #include "btmrvl_sdio.h"
@@ -335,6 +336,12 @@ int btmrvl_prepare_command(struct btmrvl_private *priv)
 	return ret;
 }
 
+void btmrvl_firmware_dump(struct btmrvl_private *priv)
+{
+	if (priv->firmware_dump)
+		priv->firmware_dump(priv);
+}
+
 static int btmrvl_tx_pkt(struct btmrvl_private *priv, struct sk_buff *skb)
 {
 	int ret = 0;