mei: move host bus message handling to hbm.c

for sake of more layered design we move host
bus message handling to the new hbm.c file

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

6 files changed, 456 insertions, 419 deletions

diff --git a/drivers/misc/mei/Makefile b/drivers/misc/mei/Makefile
index 0017842e166c..1f382a5ca3a6 100644
--- a/drivers/misc/mei/Makefile
+++ b/drivers/misc/mei/Makefile
@@ -4,6 +4,7 @@
 #
 obj-$(CONFIG_INTEL_MEI) += mei.o
 mei-objs := init.o
+mei-objs += hbm.o
 mei-objs += interrupt.o
 mei-objs += interface.o
 mei-objs += iorw.o
diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
new file mode 100644
index 000000000000..2c4c1bb6d36a
--- /dev/null
+++ b/drivers/misc/mei/hbm.c
@@ -0,0 +1,440 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2003-2012, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#include <linux/pci.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/mei.h>
+
+#include "mei_dev.h"
+#include "interface.h"
+
+/**
+ * host_start_message - mei host sends start message.
+ *
+ * @dev: the device structure
+ *
+ * returns none.
+ */
+void mei_host_start_message(struct mei_device *dev)
+{
+	struct mei_msg_hdr *mei_hdr;
+	struct hbm_host_version_request *start_req;
+	const size_t len = sizeof(struct hbm_host_version_request);
+
+	mei_hdr = mei_hbm_hdr(&dev->wr_msg_buf[0], len);
+
+	/* host start message */
+	start_req = (struct hbm_host_version_request *)&dev->wr_msg_buf[1];
+	memset(start_req, 0, len);
+	start_req->hbm_cmd = HOST_START_REQ_CMD;
+	start_req->host_version.major_version = HBM_MAJOR_VERSION;
+	start_req->host_version.minor_version = HBM_MINOR_VERSION;
+
+	dev->recvd_msg = false;
+	if (mei_write_message(dev, mei_hdr, (unsigned char *)start_req)) {
+		dev_dbg(&dev->pdev->dev, "write send version message to FW fail.\n");
+		dev->dev_state = MEI_DEV_RESETING;
+		mei_reset(dev, 1);
+	}
+	dev->init_clients_state = MEI_START_MESSAGE;
+	dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
+	return ;
+}
+
+/**
+ * host_enum_clients_message - host sends enumeration client request message.
+ *
+ * @dev: the device structure
+ *
+ * returns none.
+ */
+void mei_host_enum_clients_message(struct mei_device *dev)
+{
+	struct mei_msg_hdr *mei_hdr;
+	struct hbm_host_enum_request *enum_req;
+	const size_t len = sizeof(struct hbm_host_enum_request);
+	/* enumerate clients */
+	mei_hdr = mei_hbm_hdr(&dev->wr_msg_buf[0], len);
+
+	enum_req = (struct hbm_host_enum_request *) &dev->wr_msg_buf[1];
+	memset(enum_req, 0, sizeof(struct hbm_host_enum_request));
+	enum_req->hbm_cmd = HOST_ENUM_REQ_CMD;
+
+	if (mei_write_message(dev, mei_hdr, (unsigned char *)enum_req)) {
+		dev->dev_state = MEI_DEV_RESETING;
+		dev_dbg(&dev->pdev->dev, "write send enumeration request message to FW fail.\n");
+		mei_reset(dev, 1);
+	}
+	dev->init_clients_state = MEI_ENUM_CLIENTS_MESSAGE;
+	dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
+	return;
+}
+
+
+int mei_host_client_enumerate(struct mei_device *dev)
+{
+
+	struct mei_msg_hdr *mei_hdr;
+	struct hbm_props_request *prop_req;
+	const size_t len = sizeof(struct hbm_props_request);
+	unsigned long next_client_index;
+	u8 client_num;
+
+
+	client_num = dev->me_client_presentation_num;
+
+	next_client_index = find_next_bit(dev->me_clients_map, MEI_CLIENTS_MAX,
+					  dev->me_client_index);
+
+	/* We got all client properties */
+	if (next_client_index == MEI_CLIENTS_MAX) {
+		schedule_work(&dev->init_work);
+
+		return 0;
+	}
+
+	dev->me_clients[client_num].client_id = next_client_index;
+	dev->me_clients[client_num].mei_flow_ctrl_creds = 0;
+
+	mei_hdr = mei_hbm_hdr(&dev->wr_msg_buf[0], len);
+	prop_req = (struct hbm_props_request *)&dev->wr_msg_buf[1];
+
+	memset(prop_req, 0, sizeof(struct hbm_props_request));
+
+
+	prop_req->hbm_cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
+	prop_req->address = next_client_index;
+
+	if (mei_write_message(dev, mei_hdr, (unsigned char *) prop_req)) {
+		dev->dev_state = MEI_DEV_RESETING;
+		dev_err(&dev->pdev->dev, "Properties request command failed\n");
+		mei_reset(dev, 1);
+
+		return -EIO;
+	}
+
+	dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
+	dev->me_client_index = next_client_index;
+
+	return 0;
+}
+
+/**
+ * mei_send_flow_control - sends flow control to fw.
+ *
+ * @dev: the device structure
+ * @cl: private data of the file object
+ *
+ * This function returns -EIO on write failure
+ */
+int mei_send_flow_control(struct mei_device *dev, struct mei_cl *cl)
+{
+	struct mei_msg_hdr *mei_hdr;
+	struct hbm_flow_control *flow_ctrl;
+	const size_t len = sizeof(struct hbm_flow_control);
+
+	mei_hdr = mei_hbm_hdr(&dev->wr_msg_buf[0], len);
+
+	flow_ctrl = (struct hbm_flow_control *)&dev->wr_msg_buf[1];
+	memset(flow_ctrl, 0, len);
+	flow_ctrl->hbm_cmd = MEI_FLOW_CONTROL_CMD;
+	flow_ctrl->host_addr = cl->host_client_id;
+	flow_ctrl->me_addr = cl->me_client_id;
+	/* FIXME: reserved !? */
+	memset(flow_ctrl->reserved, 0, sizeof(flow_ctrl->reserved));
+	dev_dbg(&dev->pdev->dev, "sending flow control host client = %d, ME client = %d\n",
+		cl->host_client_id, cl->me_client_id);
+
+	return mei_write_message(dev, mei_hdr, (unsigned char *) flow_ctrl);
+}
+
+/**
+ * mei_disconnect - sends disconnect message to fw.
+ *
+ * @dev: the device structure
+ * @cl: private data of the file object
+ *
+ * This function returns -EIO on write failure
+ */
+int mei_disconnect(struct mei_device *dev, struct mei_cl *cl)
+{
+	struct mei_msg_hdr *hdr;
+	struct hbm_client_connect_request *req;
+	const size_t len = sizeof(struct hbm_client_connect_request);
+
+	hdr = mei_hbm_hdr(&dev->wr_msg_buf[0], len);
+
+	req = (struct hbm_client_connect_request *)&dev->wr_msg_buf[1];
+	memset(req, 0, len);
+	req->hbm_cmd = CLIENT_DISCONNECT_REQ_CMD;
+	req->host_addr = cl->host_client_id;
+	req->me_addr = cl->me_client_id;
+	req->reserved = 0;
+
+	return mei_write_message(dev, hdr, (unsigned char *)req);
+}
+
+/**
+ * mei_connect - sends connect message to fw.
+ *
+ * @dev: the device structure
+ * @cl: private data of the file object
+ *
+ * This function returns -EIO on write failure
+ */
+int mei_connect(struct mei_device *dev, struct mei_cl *cl)
+{
+	struct mei_msg_hdr *hdr;
+	struct hbm_client_connect_request *req;
+	const size_t len = sizeof(struct hbm_client_connect_request);
+
+	hdr = mei_hbm_hdr(&dev->wr_msg_buf[0], len);
+
+	req = (struct hbm_client_connect_request *) &dev->wr_msg_buf[1];
+	req->hbm_cmd = CLIENT_CONNECT_REQ_CMD;
+	req->host_addr = cl->host_client_id;
+	req->me_addr = cl->me_client_id;
+	req->reserved = 0;
+
+	return mei_write_message(dev, hdr, (unsigned char *) req);
+}
+
+/**
+ * same_disconn_addr - tells if they have the same address
+ *
+ * @file: private data of the file object.
+ * @disconn: disconnection request.
+ *
+ * returns !=0, same; 0,not.
+ */
+static int same_disconn_addr(struct mei_cl *cl,
+			     struct hbm_client_connect_request *req)
+{
+	return (cl->host_client_id == req->host_addr &&
+		cl->me_client_id == req->me_addr);
+}
+
+/**
+ * mei_client_disconnect_request - disconnects from request irq routine
+ *
+ * @dev: the device structure.
+ * @disconnect_req: disconnect request bus message.
+ */
+static void mei_client_disconnect_request(struct mei_device *dev,
+		struct hbm_client_connect_request *disconnect_req)
+{
+	struct hbm_client_connect_response *disconnect_res;
+	struct mei_cl *pos, *next;
+	const size_t len = sizeof(struct hbm_client_connect_response);
+
+	list_for_each_entry_safe(pos, next, &dev->file_list, link) {
+		if (same_disconn_addr(pos, disconnect_req)) {
+			dev_dbg(&dev->pdev->dev, "disconnect request host client %d ME client %d.\n",
+					disconnect_req->host_addr,
+					disconnect_req->me_addr);
+			pos->state = MEI_FILE_DISCONNECTED;
+			pos->timer_count = 0;
+			if (pos == &dev->wd_cl)
+				dev->wd_pending = false;
+			else if (pos == &dev->iamthif_cl)
+				dev->iamthif_timer = 0;
+
+			/* prepare disconnect response */
+			(void)mei_hbm_hdr((u32 *)&dev->wr_ext_msg.hdr, len);
+			disconnect_res =
+				(struct hbm_client_connect_response *)
+				&dev->wr_ext_msg.data;
+			disconnect_res->hbm_cmd = CLIENT_DISCONNECT_RES_CMD;
+			disconnect_res->host_addr = pos->host_client_id;
+			disconnect_res->me_addr = pos->me_client_id;
+			disconnect_res->status = 0;
+			break;
+		}
+	}
+}
+
+
+/**
+ * mei_hbm_dispatch - bottom half read routine after ISR to
+ * handle the read bus message cmd processing.
+ *
+ * @dev: the device structure
+ * @mei_hdr: header of bus message
+ */
+void mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
+{
+	struct mei_bus_message *mei_msg;
+	struct mei_me_client *me_client;
+	struct hbm_host_version_response *version_res;
+	struct hbm_client_connect_response *connect_res;
+	struct hbm_client_connect_response *disconnect_res;
+	struct hbm_client_connect_request *disconnect_req;
+	struct hbm_flow_control *flow_control;
+	struct hbm_props_response *props_res;
+	struct hbm_host_enum_response *enum_res;
+	struct hbm_host_stop_request *stop_req;
+
+	/* read the message to our buffer */
+	BUG_ON(hdr->length >= sizeof(dev->rd_msg_buf));
+	mei_read_slots(dev, dev->rd_msg_buf, hdr->length);
+	mei_msg = (struct mei_bus_message *)dev->rd_msg_buf;
+
+	switch (mei_msg->hbm_cmd) {
+	case HOST_START_RES_CMD:
+		version_res = (struct hbm_host_version_response *)mei_msg;
+		if (version_res->host_version_supported) {
+			dev->version.major_version = HBM_MAJOR_VERSION;
+			dev->version.minor_version = HBM_MINOR_VERSION;
+			if (dev->dev_state == MEI_DEV_INIT_CLIENTS &&
+			    dev->init_clients_state == MEI_START_MESSAGE) {
+				dev->init_clients_timer = 0;
+				mei_host_enum_clients_message(dev);
+			} else {
+				dev->recvd_msg = false;
+				dev_dbg(&dev->pdev->dev, "IMEI reset due to received host start response bus message.\n");
+				mei_reset(dev, 1);
+				return;
+			}
+		} else {
+			u32 *buf = dev->wr_msg_buf;
+			const size_t len = sizeof(struct hbm_host_stop_request);
+
+			dev->version = version_res->me_max_version;
+
+			/* send stop message */
+			hdr = mei_hbm_hdr(&buf[0], len);
+			stop_req = (struct hbm_host_stop_request *)&buf[1];
+			memset(stop_req, 0, len);
+			stop_req->hbm_cmd = HOST_STOP_REQ_CMD;
+			stop_req->reason = DRIVER_STOP_REQUEST;
+
+			mei_write_message(dev, hdr, (unsigned char *)stop_req);
+			dev_dbg(&dev->pdev->dev, "version mismatch.\n");
+			return;
+		}
+
+		dev->recvd_msg = true;
+		dev_dbg(&dev->pdev->dev, "host start response message received.\n");
+		break;
+
+	case CLIENT_CONNECT_RES_CMD:
+		connect_res = (struct hbm_client_connect_response *) mei_msg;
+		mei_client_connect_response(dev, connect_res);
+		dev_dbg(&dev->pdev->dev, "client connect response message received.\n");
+		wake_up(&dev->wait_recvd_msg);
+		break;
+
+	case CLIENT_DISCONNECT_RES_CMD:
+		disconnect_res = (struct hbm_client_connect_response *) mei_msg;
+		mei_client_disconnect_response(dev, disconnect_res);
+		dev_dbg(&dev->pdev->dev, "client disconnect response message received.\n");
+		wake_up(&dev->wait_recvd_msg);
+		break;
+
+	case MEI_FLOW_CONTROL_CMD:
+		flow_control = (struct hbm_flow_control *) mei_msg;
+		mei_client_flow_control_response(dev, flow_control);
+		dev_dbg(&dev->pdev->dev, "client flow control response message received.\n");
+		break;
+
+	case HOST_CLIENT_PROPERTIES_RES_CMD:
+		props_res = (struct hbm_props_response *)mei_msg;
+		me_client = &dev->me_clients[dev->me_client_presentation_num];
+
+		if (props_res->status || !dev->me_clients) {
+			dev_dbg(&dev->pdev->dev, "reset due to received host client properties response bus message wrong status.\n");
+			mei_reset(dev, 1);
+			return;
+		}
+
+		if (me_client->client_id != props_res->address) {
+			dev_err(&dev->pdev->dev,
+				"Host client properties reply mismatch\n");
+			mei_reset(dev, 1);
+
+			return;
+		}
+
+		if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
+		    dev->init_clients_state != MEI_CLIENT_PROPERTIES_MESSAGE) {
+			dev_err(&dev->pdev->dev,
+				"Unexpected client properties reply\n");
+			mei_reset(dev, 1);
+
+			return;
+		}
+
+		me_client->props = props_res->client_properties;
+		dev->me_client_index++;
+		dev->me_client_presentation_num++;
+
+		mei_host_client_enumerate(dev);
+
+		break;
+
+	case HOST_ENUM_RES_CMD:
+		enum_res = (struct hbm_host_enum_response *) mei_msg;
+		memcpy(dev->me_clients_map, enum_res->valid_addresses, 32);
+		if (dev->dev_state == MEI_DEV_INIT_CLIENTS &&
+		    dev->init_clients_state == MEI_ENUM_CLIENTS_MESSAGE) {
+				dev->init_clients_timer = 0;
+				dev->me_client_presentation_num = 0;
+				dev->me_client_index = 0;
+				mei_allocate_me_clients_storage(dev);
+				dev->init_clients_state =
+					MEI_CLIENT_PROPERTIES_MESSAGE;
+
+				mei_host_client_enumerate(dev);
+		} else {
+			dev_dbg(&dev->pdev->dev, "reset due to received host enumeration clients response bus message.\n");
+			mei_reset(dev, 1);
+			return;
+		}
+		break;
+
+	case HOST_STOP_RES_CMD:
+		dev->dev_state = MEI_DEV_DISABLED;
+		dev_dbg(&dev->pdev->dev, "resetting because of FW stop response.\n");
+		mei_reset(dev, 1);
+		break;
+
+	case CLIENT_DISCONNECT_REQ_CMD:
+		/* search for client */
+		disconnect_req = (struct hbm_client_connect_request *)mei_msg;
+		mei_client_disconnect_request(dev, disconnect_req);
+		break;
+
+	case ME_STOP_REQ_CMD:
+	{
+		/* prepare stop request: sent in next interrupt event */
+
+		const size_t len = sizeof(struct hbm_host_stop_request);
+
+		hdr = mei_hbm_hdr((u32 *)&dev->wr_ext_msg.hdr, len);
+		stop_req = (struct hbm_host_stop_request *)&dev->wr_ext_msg.data;
+		memset(stop_req, 0, len);
+		stop_req->hbm_cmd = HOST_STOP_REQ_CMD;
+		stop_req->reason = DRIVER_STOP_REQUEST;
+		break;
+	}
+	default:
+		BUG();
+		break;
+
+	}
+}
+
diff --git a/drivers/misc/mei/init.c b/drivers/misc/mei/init.c
index eb180555d282..0536170ff856 100644
--- a/drivers/misc/mei/init.c
+++ b/drivers/misc/mei/init.c
@@ -320,70 +320,6 @@ void mei_reset(struct mei_device *dev, int interrupts_enabled)
 }
 
 
-
-/**
- * host_start_message - mei host sends start message.
- *
- * @dev: the device structure
- *
- * returns none.
- */
-void mei_host_start_message(struct mei_device *dev)
-{
-	struct mei_msg_hdr *mei_hdr;
-	struct hbm_host_version_request *start_req;
-	const size_t len = sizeof(struct hbm_host_version_request);
-
-	mei_hdr = mei_hbm_hdr(&dev->wr_msg_buf[0], len);
-
-	/* host start message */
-	start_req = (struct hbm_host_version_request *)&dev->wr_msg_buf[1];
-	memset(start_req, 0, len);
-	start_req->hbm_cmd = HOST_START_REQ_CMD;
-	start_req->host_version.major_version = HBM_MAJOR_VERSION;
-	start_req->host_version.minor_version = HBM_MINOR_VERSION;
-
-	dev->recvd_msg = false;
-	if (mei_write_message(dev, mei_hdr, (unsigned char *)start_req)) {
-		dev_dbg(&dev->pdev->dev, "write send version message to FW fail.\n");
-		dev->dev_state = MEI_DEV_RESETING;
-		mei_reset(dev, 1);
-	}
-	dev->init_clients_state = MEI_START_MESSAGE;
-	dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
-	return ;
-}
-
-/**
- * host_enum_clients_message - host sends enumeration client request message.
- *
- * @dev: the device structure
- *
- * returns none.
- */
-void mei_host_enum_clients_message(struct mei_device *dev)
-{
-	struct mei_msg_hdr *mei_hdr;
-	struct hbm_host_enum_request *enum_req;
-	const size_t len = sizeof(struct hbm_host_enum_request);
-	/* enumerate clients */
-	mei_hdr = mei_hbm_hdr(&dev->wr_msg_buf[0], len);
-
-	enum_req = (struct hbm_host_enum_request *) &dev->wr_msg_buf[1];
-	memset(enum_req, 0, sizeof(struct hbm_host_enum_request));
-	enum_req->hbm_cmd = HOST_ENUM_REQ_CMD;
-
-	if (mei_write_message(dev, mei_hdr, (unsigned char *)enum_req)) {
-		dev->dev_state = MEI_DEV_RESETING;
-		dev_dbg(&dev->pdev->dev, "write send enumeration request message to FW fail.\n");
-		mei_reset(dev, 1);
-	}
-	dev->init_clients_state = MEI_ENUM_CLIENTS_MESSAGE;
-	dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
-	return;
-}
-
-
 /**
  * allocate_me_clients_storage - allocates storage for me clients
  *
@@ -457,53 +393,6 @@ void mei_host_client_init(struct work_struct *work)
 	mutex_unlock(&dev->device_lock);
 }
 
-int mei_host_client_enumerate(struct mei_device *dev)
-{
-
-	struct mei_msg_hdr *mei_hdr;
-	struct hbm_props_request *prop_req;
-	const size_t len = sizeof(struct hbm_props_request);
-	unsigned long next_client_index;
-	u8 client_num;
-
-
-	client_num = dev->me_client_presentation_num;
-
-	next_client_index = find_next_bit(dev->me_clients_map, MEI_CLIENTS_MAX,
-					  dev->me_client_index);
-
-	/* We got all client properties */
-	if (next_client_index == MEI_CLIENTS_MAX) {
-		schedule_work(&dev->init_work);
-
-		return 0;
-	}
-
-	dev->me_clients[client_num].client_id = next_client_index;
-	dev->me_clients[client_num].mei_flow_ctrl_creds = 0;
-
-	mei_hdr = mei_hbm_hdr(&dev->wr_msg_buf[0], len);
-	prop_req = (struct hbm_props_request *)&dev->wr_msg_buf[1];
-
-	memset(prop_req, 0, sizeof(struct hbm_props_request));
-
-
-	prop_req->hbm_cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
-	prop_req->address = next_client_index;
-
-	if (mei_write_message(dev, mei_hdr, (unsigned char *) prop_req)) {
-		dev->dev_state = MEI_DEV_RESETING;
-		dev_err(&dev->pdev->dev, "Properties request command failed\n");
-		mei_reset(dev, 1);
-
-		return -EIO;
-	}
-
-	dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
-	dev->me_client_index = next_client_index;
-
-	return 0;
-}
 
 /**
  * mei_init_file_private - initializes private file structure.
diff --git a/drivers/misc/mei/interface.c b/drivers/misc/mei/interface.c
index 939d85b40738..155bd7efe4e5 100644
--- a/drivers/misc/mei/interface.c
+++ b/drivers/misc/mei/interface.c
@@ -367,34 +367,6 @@ int mei_flow_ctrl_reduce(struct mei_device *dev, struct mei_cl *cl)
 	return -ENOENT;
 }
 
-/**
- * mei_send_flow_control - sends flow control to fw.
- *
- * @dev: the device structure
- * @cl: private data of the file object
- *
- * This function returns -EIO on write failure
- */
-int mei_send_flow_control(struct mei_device *dev, struct mei_cl *cl)
-{
-	struct mei_msg_hdr *mei_hdr;
-	struct hbm_flow_control *flow_ctrl;
-	const size_t len = sizeof(struct hbm_flow_control);
-
-	mei_hdr = mei_hbm_hdr(&dev->wr_msg_buf[0], len);
-
-	flow_ctrl = (struct hbm_flow_control *)&dev->wr_msg_buf[1];
-	memset(flow_ctrl, 0, len);
-	flow_ctrl->hbm_cmd = MEI_FLOW_CONTROL_CMD;
-	flow_ctrl->host_addr = cl->host_client_id;
-	flow_ctrl->me_addr = cl->me_client_id;
-	/* FIXME: reserved !? */
-	memset(flow_ctrl->reserved, 0, sizeof(flow_ctrl->reserved));
-	dev_dbg(&dev->pdev->dev, "sending flow control host client = %d, ME client = %d\n",
-		cl->host_client_id, cl->me_client_id);
-
-	return mei_write_message(dev, mei_hdr, (unsigned char *) flow_ctrl);
-}
 
 /**
  * mei_other_client_is_connecting - checks if other
@@ -421,53 +393,3 @@ int mei_other_client_is_connecting(struct mei_device *dev,
 	return 0;
 }
 
-/**
- * mei_disconnect - sends disconnect message to fw.
- *
- * @dev: the device structure
- * @cl: private data of the file object
- *
- * This function returns -EIO on write failure
- */
-int mei_disconnect(struct mei_device *dev, struct mei_cl *cl)
-{
-	struct mei_msg_hdr *hdr;
-	struct hbm_client_connect_request *req;
-	const size_t len = sizeof(struct hbm_client_connect_request);
-
-	hdr = mei_hbm_hdr(&dev->wr_msg_buf[0], len);
-
-	req = (struct hbm_client_connect_request *)&dev->wr_msg_buf[1];
-	memset(req, 0, len);
-	req->hbm_cmd = CLIENT_DISCONNECT_REQ_CMD;
-	req->host_addr = cl->host_client_id;
-	req->me_addr = cl->me_client_id;
-	req->reserved = 0;
-
-	return mei_write_message(dev, hdr, (unsigned char *)req);
-}
-
-/**
- * mei_connect - sends connect message to fw.
- *
- * @dev: the device structure
- * @cl: private data of the file object
- *
- * This function returns -EIO on write failure
- */
-int mei_connect(struct mei_device *dev, struct mei_cl *cl)
-{
-	struct mei_msg_hdr *hdr;
-	struct hbm_client_connect_request *req;
-	const size_t len = sizeof(struct hbm_client_connect_request);
-
-	hdr = mei_hbm_hdr(&dev->wr_msg_buf[0], len);
-
-	req = (struct hbm_client_connect_request *) &dev->wr_msg_buf[1];
-	req->hbm_cmd = CLIENT_CONNECT_REQ_CMD;
-	req->host_addr = cl->host_client_id;
-	req->me_addr = cl->me_client_id;
-	req->reserved = 0;
-
-	return mei_write_message(dev, hdr, (unsigned char *) req);
-}
diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index cd89b68fcf43..d4312a8e139a 100644
--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -208,7 +208,7 @@ static bool is_treat_specially_client(struct mei_cl *cl,
  * @dev: the device structure
  * @rs: connect response bus message
  */
-static void mei_client_connect_response(struct mei_device *dev,
+void mei_client_connect_response(struct mei_device *dev,
 		struct hbm_client_connect_response *rs)
 {
 
@@ -261,8 +261,8 @@ static void mei_client_connect_response(struct mei_device *dev,
  * @dev: the device structure
  * @rs: disconnect response bus message
  */
-static void mei_client_disconnect_response(struct mei_device *dev,
-					struct hbm_client_connect_response *rs)
+void mei_client_disconnect_response(struct mei_device *dev,
+				    struct hbm_client_connect_response *rs)
 {
 	struct mei_cl *cl;
 	struct mei_cl_cb *pos = NULL, *next = NULL;
@@ -347,7 +347,7 @@ static void add_single_flow_creds(struct mei_device *dev,
  * @dev: the device structure
  * @flow_control: flow control response bus message
  */
-static void mei_client_flow_control_response(struct mei_device *dev,
+void mei_client_flow_control_response(struct mei_device *dev,
 		struct hbm_flow_control *flow_control)
 {
 	struct mei_cl *cl_pos = NULL;
@@ -381,231 +381,6 @@ static void mei_client_flow_control_response(struct mei_device *dev,
 	}
 }
 
-/**
- * same_disconn_addr - tells if they have the same address
- *
- * @file: private data of the file object.
- * @disconn: disconnection request.
- *
- * returns !=0, same; 0,not.
- */
-static int same_disconn_addr(struct mei_cl *cl,
-			     struct hbm_client_connect_request *req)
-{
-	return (cl->host_client_id == req->host_addr &&
-		cl->me_client_id == req->me_addr);
-}
-
-/**
- * mei_client_disconnect_request - disconnects from request irq routine
- *
- * @dev: the device structure.
- * @disconnect_req: disconnect request bus message.
- */
-static void mei_client_disconnect_request(struct mei_device *dev,
-		struct hbm_client_connect_request *disconnect_req)
-{
-	struct hbm_client_connect_response *disconnect_res;
-	struct mei_cl *pos, *next;
-	const size_t len = sizeof(struct hbm_client_connect_response);
-
-	list_for_each_entry_safe(pos, next, &dev->file_list, link) {
-		if (same_disconn_addr(pos, disconnect_req)) {
-			dev_dbg(&dev->pdev->dev, "disconnect request host client %d ME client %d.\n",
-					disconnect_req->host_addr,
-					disconnect_req->me_addr);
-			pos->state = MEI_FILE_DISCONNECTED;
-			pos->timer_count = 0;
-			if (pos == &dev->wd_cl)
-				dev->wd_pending = false;
-			else if (pos == &dev->iamthif_cl)
-				dev->iamthif_timer = 0;
-
-			/* prepare disconnect response */
-			(void)mei_hbm_hdr((u32 *)&dev->wr_ext_msg.hdr, len);
-			disconnect_res =
-				(struct hbm_client_connect_response *)
-				&dev->wr_ext_msg.data;
-			disconnect_res->hbm_cmd = CLIENT_DISCONNECT_RES_CMD;
-			disconnect_res->host_addr = pos->host_client_id;
-			disconnect_res->me_addr = pos->me_client_id;
-			disconnect_res->status = 0;
-			break;
-		}
-	}
-}
-
-/**
- * mei_irq_thread_read_bus_message - bottom half read routine after ISR to
- * handle the read bus message cmd processing.
- *
- * @dev: the device structure
- * @mei_hdr: header of bus message
- */
-static void mei_irq_thread_read_bus_message(struct mei_device *dev,
-		struct mei_msg_hdr *hdr)
-{
-	struct mei_bus_message *mei_msg;
-	struct mei_me_client *me_client;
-	struct hbm_host_version_response *version_res;
-	struct hbm_client_connect_response *connect_res;
-	struct hbm_client_connect_response *disconnect_res;
-	struct hbm_client_connect_request *disconnect_req;
-	struct hbm_flow_control *flow_control;
-	struct hbm_props_response *props_res;
-	struct hbm_host_enum_response *enum_res;
-	struct hbm_host_stop_request *stop_req;
-
-	/* read the message to our buffer */
-	BUG_ON(hdr->length >= sizeof(dev->rd_msg_buf));
-	mei_read_slots(dev, dev->rd_msg_buf, hdr->length);
-	mei_msg = (struct mei_bus_message *)dev->rd_msg_buf;
-
-	switch (mei_msg->hbm_cmd) {
-	case HOST_START_RES_CMD:
-		version_res = (struct hbm_host_version_response *) mei_msg;
-		if (version_res->host_version_supported) {
-			dev->version.major_version = HBM_MAJOR_VERSION;
-			dev->version.minor_version = HBM_MINOR_VERSION;
-			if (dev->dev_state == MEI_DEV_INIT_CLIENTS &&
-			    dev->init_clients_state == MEI_START_MESSAGE) {
-				dev->init_clients_timer = 0;
-				mei_host_enum_clients_message(dev);
-			} else {
-				dev->recvd_msg = false;
-				dev_dbg(&dev->pdev->dev, "IMEI reset due to received host start response bus message.\n");
-				mei_reset(dev, 1);
-				return;
-			}
-		} else {
-			u32 *buf = dev->wr_msg_buf;
-			const size_t len = sizeof(struct hbm_host_stop_request);
-
-			dev->version = version_res->me_max_version;
-
-			/* send stop message */
-			hdr = mei_hbm_hdr(&buf[0], len);
-			stop_req = (struct hbm_host_stop_request *)&buf[1];
-			memset(stop_req, 0, len);
-			stop_req->hbm_cmd = HOST_STOP_REQ_CMD;
-			stop_req->reason = DRIVER_STOP_REQUEST;
-
-			mei_write_message(dev, hdr, (unsigned char *)stop_req);
-			dev_dbg(&dev->pdev->dev, "version mismatch.\n");
-			return;
-		}
-
-		dev->recvd_msg = true;
-		dev_dbg(&dev->pdev->dev, "host start response message received.\n");
-		break;
-
-	case CLIENT_CONNECT_RES_CMD:
-		connect_res = (struct hbm_client_connect_response *) mei_msg;
-		mei_client_connect_response(dev, connect_res);
-		dev_dbg(&dev->pdev->dev, "client connect response message received.\n");
-		wake_up(&dev->wait_recvd_msg);
-		break;
-
-	case CLIENT_DISCONNECT_RES_CMD:
-		disconnect_res = (struct hbm_client_connect_response *) mei_msg;
-		mei_client_disconnect_response(dev, disconnect_res);
-		dev_dbg(&dev->pdev->dev, "client disconnect response message received.\n");
-		wake_up(&dev->wait_recvd_msg);
-		break;
-
-	case MEI_FLOW_CONTROL_CMD:
-		flow_control = (struct hbm_flow_control *) mei_msg;
-		mei_client_flow_control_response(dev, flow_control);
-		dev_dbg(&dev->pdev->dev, "client flow control response message received.\n");
-		break;
-
-	case HOST_CLIENT_PROPERTIES_RES_CMD:
-		props_res = (struct hbm_props_response *)mei_msg;
-		me_client = &dev->me_clients[dev->me_client_presentation_num];
-
-		if (props_res->status || !dev->me_clients) {
-			dev_dbg(&dev->pdev->dev, "reset due to received host client properties response bus message wrong status.\n");
-			mei_reset(dev, 1);
-			return;
-		}
-
-		if (me_client->client_id != props_res->address) {
-			dev_err(&dev->pdev->dev,
-				"Host client properties reply mismatch\n");
-			mei_reset(dev, 1);
-
-			return;
-		}
-
-		if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
-		    dev->init_clients_state != MEI_CLIENT_PROPERTIES_MESSAGE) {
-			dev_err(&dev->pdev->dev,
-				"Unexpected client properties reply\n");
-			mei_reset(dev, 1);
-
-			return;
-		}
-
-		me_client->props = props_res->client_properties;
-		dev->me_client_index++;
-		dev->me_client_presentation_num++;
-
-		mei_host_client_enumerate(dev);
-
-		break;
-
-	case HOST_ENUM_RES_CMD:
-		enum_res = (struct hbm_host_enum_response *) mei_msg;
-		memcpy(dev->me_clients_map, enum_res->valid_addresses, 32);
-		if (dev->dev_state == MEI_DEV_INIT_CLIENTS &&
-		    dev->init_clients_state == MEI_ENUM_CLIENTS_MESSAGE) {
-				dev->init_clients_timer = 0;
-				dev->me_client_presentation_num = 0;
-				dev->me_client_index = 0;
-				mei_allocate_me_clients_storage(dev);
-				dev->init_clients_state =
-					MEI_CLIENT_PROPERTIES_MESSAGE;
-
-				mei_host_client_enumerate(dev);
-		} else {
-			dev_dbg(&dev->pdev->dev, "reset due to received host enumeration clients response bus message.\n");
-			mei_reset(dev, 1);
-			return;
-		}
-		break;
-
-	case HOST_STOP_RES_CMD:
-		dev->dev_state = MEI_DEV_DISABLED;
-		dev_dbg(&dev->pdev->dev, "resetting because of FW stop response.\n");
-		mei_reset(dev, 1);
-		break;
-
-	case CLIENT_DISCONNECT_REQ_CMD:
-		/* search for client */
-		disconnect_req = (struct hbm_client_connect_request *)mei_msg;
-		mei_client_disconnect_request(dev, disconnect_req);
-		break;
-
-	case ME_STOP_REQ_CMD:
-	{
-		/* prepare stop request: sent in next interrupt event */
-
-		const size_t len = sizeof(struct hbm_host_stop_request);
-
-		hdr = mei_hbm_hdr((u32 *)&dev->wr_ext_msg.hdr, len);
-		stop_req = (struct hbm_host_stop_request *)&dev->wr_ext_msg.data;
-		memset(stop_req, 0, len);
-		stop_req->hbm_cmd = HOST_STOP_REQ_CMD;
-		stop_req->reason = DRIVER_STOP_REQUEST;
-		break;
-	}
-	default:
-		BUG();
-		break;
-
-	}
-}
-
 
 /**
  * _mei_hb_read - processes read related operation.
@@ -806,7 +581,7 @@ static int mei_irq_thread_read_handler(struct mei_cl_cb *cmpl_list,
 	/* decide where to read the message too */
 	if (!mei_hdr->host_addr) {
 		dev_dbg(&dev->pdev->dev, "call mei_irq_thread_read_bus_message.\n");
-		mei_irq_thread_read_bus_message(dev, mei_hdr);
+		mei_hbm_dispatch(dev, mei_hdr);
 		dev_dbg(&dev->pdev->dev, "end mei_irq_thread_read_bus_message.\n");
 	} else if (mei_hdr->host_addr == dev->iamthif_cl.host_client_id &&
 		   (MEI_FILE_CONNECTED == dev->iamthif_cl.state) &&
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index 472c9cacc543..b437f8b15406 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -402,6 +402,14 @@ int mei_ioctl_connect_client(struct file *file,
 int mei_start_read(struct mei_device *dev, struct mei_cl *cl);
 
 
+void mei_client_disconnect_response(struct mei_device *dev,
+			struct hbm_client_connect_response *rs);
+
+void mei_client_connect_response(struct mei_device *dev,
+		struct hbm_client_connect_response *rs);
+
+void mei_client_flow_control_response(struct mei_device *dev,
+		struct hbm_flow_control *flow_control);
 /*
  * AMTHIF - AMT Host Interface Functions
  */
@@ -452,6 +460,8 @@ void mei_enable_interrupts(struct mei_device *dev);
 void mei_disable_interrupts(struct mei_device *dev);
 
 
+void mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr);
+
 static inline struct mei_msg_hdr *mei_hbm_hdr(u32 *buf, size_t length)
 {
 	struct mei_msg_hdr *hdr = (struct mei_msg_hdr *)buf;