Initial commit; kernel source import

drivers/misc/mei/Kconfig

@@ -0,0 +1,36 @@
+config INTEL_MEI
+	tristate "Intel Management Engine Interface"
+	depends on X86 && PCI && WATCHDOG_CORE
+	help
+	  The Intel Management Engine (Intel ME) provides Manageability,
+	  Security and Media services for system containing Intel chipsets.
+	  if selected /dev/mei misc device will be created.
+
+	  For more information see
+	  <http://software.intel.com/en-us/manageability/>
+
+config INTEL_MEI_ME
+	tristate "ME Enabled Intel Chipsets"
+	select INTEL_MEI
+	depends on X86 && PCI && WATCHDOG_CORE
+	help
+	  MEI support for ME Enabled Intel chipsets.
+
+	  Supported Chipsets are:
+	  7 Series Chipset Family
+	  6 Series Chipset Family
+	  5 Series Chipset Family
+	  4 Series Chipset Family
+	  Mobile 4 Series Chipset Family
+	  ICH9
+	  82946GZ/GL
+	  82G35 Express
+	  82Q963/Q965
+	  82P965/G965
+	  Mobile PM965/GM965
+	  Mobile GME965/GLE960
+	  82Q35 Express
+	  82G33/G31/P35/P31 Express
+	  82Q33 Express
+	  82X38/X48 Express
+

drivers/misc/mei/Makefile

@@ -0,0 +1,19 @@
+#
+# Makefile - Intel Management Engine Interface (Intel MEI) Linux driver
+# Copyright (c) 2010-2011, Intel Corporation.
+#
+obj-$(CONFIG_INTEL_MEI) += mei.o
+mei-objs := init.o
+mei-objs += hbm.o
+mei-objs += interrupt.o
+mei-objs += client.o
+mei-objs += main.o
+mei-objs += amthif.o
+mei-objs += wd.o
+mei-objs += bus.o
+mei-objs += nfc.o
+mei-$(CONFIG_DEBUG_FS) += debugfs.o
+
+obj-$(CONFIG_INTEL_MEI_ME) += mei-me.o
+mei-me-objs := pci-me.o
+mei-me-objs += hw-me.o

drivers/misc/mei/amthif.c

@@ -0,0 +1,734 @@
+/*
+ *
+ * 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/kernel.h>
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/aio.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/ioctl.h>
+#include <linux/cdev.h>
+#include <linux/list.h>
+#include <linux/delay.h>
+#include <linux/sched.h>
+#include <linux/uuid.h>
+#include <linux/jiffies.h>
+#include <linux/uaccess.h>
+
+#include <linux/mei.h>
+
+#include "mei_dev.h"
+#include "hbm.h"
+#include "hw-me.h"
+#include "client.h"
+
+const uuid_le mei_amthif_guid  = UUID_LE(0x12f80028, 0xb4b7, 0x4b2d,
+					 0xac, 0xa8, 0x46, 0xe0,
+					 0xff, 0x65, 0x81, 0x4c);
+
+/**
+ * mei_amthif_reset_params - initializes mei device iamthif
+ *
+ * @dev: the device structure
+ */
+void mei_amthif_reset_params(struct mei_device *dev)
+{
+	/* reset iamthif parameters. */
+	dev->iamthif_current_cb = NULL;
+	dev->iamthif_msg_buf_size = 0;
+	dev->iamthif_msg_buf_index = 0;
+	dev->iamthif_canceled = false;
+	dev->iamthif_ioctl = false;
+	dev->iamthif_state = MEI_IAMTHIF_IDLE;
+	dev->iamthif_timer = 0;
+	dev->iamthif_stall_timer = 0;
+}
+
+/**
+ * mei_amthif_host_init - mei initialization amthif client.
+ *
+ * @dev: the device structure
+ *
+ */
+int mei_amthif_host_init(struct mei_device *dev)
+{
+	struct mei_cl *cl = &dev->iamthif_cl;
+	unsigned char *msg_buf;
+	int ret, i;
+
+	dev->iamthif_state = MEI_IAMTHIF_IDLE;
+
+	mei_cl_init(cl, dev);
+
+	i = mei_me_cl_by_uuid(dev, &mei_amthif_guid);
+	if (i < 0) {
+		dev_info(&dev->pdev->dev, "amthif: failed to find the client\n");
+		return -ENOENT;
+	}
+
+	cl->me_client_id = dev->me_clients[i].client_id;
+
+	/* Assign iamthif_mtu to the value received from ME  */
+
+	dev->iamthif_mtu = dev->me_clients[i].props.max_msg_length;
+	dev_dbg(&dev->pdev->dev, "IAMTHIF_MTU = %d\n",
+			dev->me_clients[i].props.max_msg_length);
+
+	kfree(dev->iamthif_msg_buf);
+	dev->iamthif_msg_buf = NULL;
+
+	/* allocate storage for ME message buffer */
+	msg_buf = kcalloc(dev->iamthif_mtu,
+			sizeof(unsigned char), GFP_KERNEL);
+	if (!msg_buf) {
+		dev_err(&dev->pdev->dev, "amthif: memory allocation for ME message buffer failed.\n");
+		return -ENOMEM;
+	}
+
+	dev->iamthif_msg_buf = msg_buf;
+
+	ret = mei_cl_link(cl, MEI_IAMTHIF_HOST_CLIENT_ID);
+
+	if (ret < 0) {
+		dev_err(&dev->pdev->dev, "amthif: failed link client\n");
+		return -ENOENT;
+	}
+
+	cl->state = MEI_FILE_CONNECTING;
+
+	if (mei_hbm_cl_connect_req(dev, cl)) {
+		dev_dbg(&dev->pdev->dev, "amthif: Failed to connect to ME client\n");
+		cl->state = MEI_FILE_DISCONNECTED;
+		cl->host_client_id = 0;
+	} else {
+		cl->timer_count = MEI_CONNECT_TIMEOUT;
+	}
+	return 0;
+}
+
+/**
+ * mei_amthif_find_read_list_entry - finds a amthilist entry for current file
+ *
+ * @dev: the device structure
+ * @file: pointer to file object
+ *
+ * returns   returned a list entry on success, NULL on failure.
+ */
+struct mei_cl_cb *mei_amthif_find_read_list_entry(struct mei_device *dev,
+						struct file *file)
+{
+	struct mei_cl_cb *pos = NULL;
+	struct mei_cl_cb *next = NULL;
+
+	list_for_each_entry_safe(pos, next,
+				&dev->amthif_rd_complete_list.list, list) {
+		if (pos->cl && pos->cl == &dev->iamthif_cl &&
+			pos->file_object == file)
+			return pos;
+	}
+	return NULL;
+}
+
+
+/**
+ * mei_amthif_read - read data from AMTHIF client
+ *
+ * @dev: the device structure
+ * @if_num:  minor number
+ * @file: pointer to file object
+ * @*ubuf: pointer to user data in user space
+ * @length: data length to read
+ * @offset: data read offset
+ *
+ * Locking: called under "dev->device_lock" lock
+ *
+ * returns
+ *  returned data length on success,
+ *  zero if no data to read,
+ *  negative on failure.
+ */
+int mei_amthif_read(struct mei_device *dev, struct file *file,
+	       char __user *ubuf, size_t length, loff_t *offset)
+{
+	int rets;
+	int wait_ret;
+	struct mei_cl_cb *cb = NULL;
+	struct mei_cl *cl = file->private_data;
+	unsigned long timeout;
+	int i;
+
+	/* Only Posible if we are in timeout */
+	if (!cl || cl != &dev->iamthif_cl) {
+		dev_dbg(&dev->pdev->dev, "bad file ext.\n");
+		return -ETIMEDOUT;
+	}
+
+	i = mei_me_cl_by_id(dev, dev->iamthif_cl.me_client_id);
+
+	if (i < 0) {
+		dev_dbg(&dev->pdev->dev, "amthif client not found.\n");
+		return -ENODEV;
+	}
+	dev_dbg(&dev->pdev->dev, "checking amthif data\n");
+	cb = mei_amthif_find_read_list_entry(dev, file);
+
+	/* Check for if we can block or not*/
+	if (cb == NULL && file->f_flags & O_NONBLOCK)
+		return -EAGAIN;
+
+
+	dev_dbg(&dev->pdev->dev, "waiting for amthif data\n");
+	while (cb == NULL) {
+		/* unlock the Mutex */
+		mutex_unlock(&dev->device_lock);
+
+		wait_ret = wait_event_interruptible(dev->iamthif_cl.wait,
+			(cb = mei_amthif_find_read_list_entry(dev, file)));
+
+		/* Locking again the Mutex */
+		mutex_lock(&dev->device_lock);
+
+		if (wait_ret)
+			return -ERESTARTSYS;
+
+		dev_dbg(&dev->pdev->dev, "woke up from sleep\n");
+	}
+
+
+	dev_dbg(&dev->pdev->dev, "Got amthif data\n");
+	dev->iamthif_timer = 0;
+
+	if (cb) {
+		timeout = cb->read_time +
+			mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER);
+		dev_dbg(&dev->pdev->dev, "amthif timeout = %lud\n",
+				timeout);
+
+		if  (time_after(jiffies, timeout)) {
+			dev_dbg(&dev->pdev->dev, "amthif Time out\n");
+			/* 15 sec for the message has expired */
+			list_del(&cb->list);
+			rets = -ETIMEDOUT;
+			goto free;
+		}
+	}
+	/* if the whole message will fit remove it from the list */
+	if (cb->buf_idx >= *offset && length >= (cb->buf_idx - *offset))
+		list_del(&cb->list);
+	else if (cb->buf_idx > 0 && cb->buf_idx <= *offset) {
+		/* end of the message has been reached */
+		list_del(&cb->list);
+		rets = 0;
+		goto free;
+	}
+		/* else means that not full buffer will be read and do not
+		 * remove message from deletion list
+		 */
+
+	dev_dbg(&dev->pdev->dev, "amthif cb->response_buffer size - %d\n",
+	    cb->response_buffer.size);
+	dev_dbg(&dev->pdev->dev, "amthif cb->buf_idx - %lu\n", cb->buf_idx);
+
+	/* length is being turncated to PAGE_SIZE, however,
+	 * the buf_idx may point beyond */
+	length = min_t(size_t, length, (cb->buf_idx - *offset));
+
+	if (copy_to_user(ubuf, cb->response_buffer.data + *offset, length))
+		rets = -EFAULT;
+	else {
+		rets = length;
+		if ((*offset + length) < cb->buf_idx) {
+			*offset += length;
+			goto out;
+		}
+	}
+free:
+	dev_dbg(&dev->pdev->dev, "free amthif cb memory.\n");
+	*offset = 0;
+	mei_io_cb_free(cb);
+out:
+	return rets;
+}
+
+/**
+ * mei_amthif_send_cmd - send amthif command to the ME
+ *
+ * @dev: the device structure
+ * @cb: mei call back struct
+ *
+ * returns 0 on success, <0 on failure.
+ *
+ */
+static int mei_amthif_send_cmd(struct mei_device *dev, struct mei_cl_cb *cb)
+{
+	struct mei_msg_hdr mei_hdr;
+	int ret;
+
+	if (!dev || !cb)
+		return -ENODEV;
+
+	dev_dbg(&dev->pdev->dev, "write data to amthif client.\n");
+
+	dev->iamthif_state = MEI_IAMTHIF_WRITING;
+	dev->iamthif_current_cb = cb;
+	dev->iamthif_file_object = cb->file_object;
+	dev->iamthif_canceled = false;
+	dev->iamthif_ioctl = true;
+	dev->iamthif_msg_buf_size = cb->request_buffer.size;
+	memcpy(dev->iamthif_msg_buf, cb->request_buffer.data,
+	       cb->request_buffer.size);
+
+	ret = mei_cl_flow_ctrl_creds(&dev->iamthif_cl);
+	if (ret < 0)
+		return ret;
+
+	if (ret && dev->hbuf_is_ready) {
+		ret = 0;
+		dev->hbuf_is_ready = false;
+		if (cb->request_buffer.size > mei_hbuf_max_len(dev)) {
+			mei_hdr.length = mei_hbuf_max_len(dev);
+			mei_hdr.msg_complete = 0;
+		} else {
+			mei_hdr.length = cb->request_buffer.size;
+			mei_hdr.msg_complete = 1;
+		}
+
+		mei_hdr.host_addr = dev->iamthif_cl.host_client_id;
+		mei_hdr.me_addr = dev->iamthif_cl.me_client_id;
+		mei_hdr.reserved = 0;
+		dev->iamthif_msg_buf_index += mei_hdr.length;
+		if (mei_write_message(dev, &mei_hdr,
+					(unsigned char *)dev->iamthif_msg_buf))
+			return -ENODEV;
+
+		if (mei_hdr.msg_complete) {
+			if (mei_cl_flow_ctrl_reduce(&dev->iamthif_cl))
+				return -ENODEV;
+			dev->iamthif_flow_control_pending = true;
+			dev->iamthif_state = MEI_IAMTHIF_FLOW_CONTROL;
+			dev_dbg(&dev->pdev->dev, "add amthif cb to write waiting list\n");
+			dev->iamthif_current_cb = cb;
+			dev->iamthif_file_object = cb->file_object;
+			list_add_tail(&cb->list, &dev->write_waiting_list.list);
+		} else {
+			dev_dbg(&dev->pdev->dev, "message does not complete, so add amthif cb to write list.\n");
+			list_add_tail(&cb->list, &dev->write_list.list);
+		}
+	} else {
+		if (!dev->hbuf_is_ready)
+			dev_dbg(&dev->pdev->dev, "host buffer is not empty");
+
+		dev_dbg(&dev->pdev->dev, "No flow control credentials, so add iamthif cb to write list.\n");
+		list_add_tail(&cb->list, &dev->write_list.list);
+	}
+	return 0;
+}
+
+/**
+ * mei_amthif_write - write amthif data to amthif client
+ *
+ * @dev: the device structure
+ * @cb: mei call back struct
+ *
+ * returns 0 on success, <0 on failure.
+ *
+ */
+int mei_amthif_write(struct mei_device *dev, struct mei_cl_cb *cb)
+{
+	int ret;
+
+	if (!dev || !cb)
+		return -ENODEV;
+
+	ret = mei_io_cb_alloc_resp_buf(cb, dev->iamthif_mtu);
+	if (ret)
+		return ret;
+
+	cb->fop_type = MEI_FOP_IOCTL;
+
+	if (!list_empty(&dev->amthif_cmd_list.list) ||
+	    dev->iamthif_state != MEI_IAMTHIF_IDLE) {
+		dev_dbg(&dev->pdev->dev,
+			"amthif state = %d\n", dev->iamthif_state);
+		dev_dbg(&dev->pdev->dev, "AMTHIF: add cb to the wait list\n");
+		list_add_tail(&cb->list, &dev->amthif_cmd_list.list);
+		return 0;
+	}
+	return mei_amthif_send_cmd(dev, cb);
+}
+/**
+ * mei_amthif_run_next_cmd
+ *
+ * @dev: the device structure
+ *
+ * returns 0 on success, <0 on failure.
+ */
+void mei_amthif_run_next_cmd(struct mei_device *dev)
+{
+	struct mei_cl_cb *pos = NULL;
+	struct mei_cl_cb *next = NULL;
+	int status;
+
+	if (!dev)
+		return;
+
+	dev->iamthif_msg_buf_size = 0;
+	dev->iamthif_msg_buf_index = 0;
+	dev->iamthif_canceled = false;
+	dev->iamthif_ioctl = true;
+	dev->iamthif_state = MEI_IAMTHIF_IDLE;
+	dev->iamthif_timer = 0;
+	dev->iamthif_file_object = NULL;
+
+	dev_dbg(&dev->pdev->dev, "complete amthif cmd_list cb.\n");
+
+	list_for_each_entry_safe(pos, next, &dev->amthif_cmd_list.list, list) {
+		list_del(&pos->list);
+
+		if (pos->cl && pos->cl == &dev->iamthif_cl) {
+			status = mei_amthif_send_cmd(dev, pos);
+			if (status) {
+				dev_dbg(&dev->pdev->dev,
+					"amthif write failed status = %d\n",
+						status);
+				return;
+			}
+			break;
+		}
+	}
+}
+
+
+unsigned int mei_amthif_poll(struct mei_device *dev,
+		struct file *file, poll_table *wait)
+{
+	unsigned int mask = 0;
+	mutex_unlock(&dev->device_lock);
+	poll_wait(file, &dev->iamthif_cl.wait, wait);
+	mutex_lock(&dev->device_lock);
+	if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE &&
+		dev->iamthif_file_object == file) {
+		mask |= (POLLIN | POLLRDNORM);
+		dev_dbg(&dev->pdev->dev, "run next amthif cb\n");
+		mei_amthif_run_next_cmd(dev);
+	}
+	return mask;
+}
+
+
+
+/**
+ * mei_amthif_irq_write_completed - processes completed iamthif operation.
+ *
+ * @dev: the device structure.
+ * @slots: free slots.
+ * @cb_pos: callback block.
+ * @cl: private data of the file object.
+ * @cmpl_list: complete list.
+ *
+ * returns 0, OK; otherwise, error.
+ */
+int mei_amthif_irq_write_complete(struct mei_device *dev, s32 *slots,
+			struct mei_cl_cb *cb, struct mei_cl_cb *cmpl_list)
+{
+	struct mei_msg_hdr mei_hdr;
+	struct mei_cl *cl = cb->cl;
+	size_t len = dev->iamthif_msg_buf_size - dev->iamthif_msg_buf_index;
+	u32 msg_slots = mei_data2slots(len);
+
+	mei_hdr.host_addr = cl->host_client_id;
+	mei_hdr.me_addr = cl->me_client_id;
+	mei_hdr.reserved = 0;
+
+	if (*slots >= msg_slots) {
+		mei_hdr.length = len;
+		mei_hdr.msg_complete = 1;
+	/* Split the message only if we can write the whole host buffer */
+	} else if (*slots == dev->hbuf_depth) {
+		msg_slots = *slots;
+		len = (*slots * sizeof(u32)) - sizeof(struct mei_msg_hdr);
+		mei_hdr.length = len;
+		mei_hdr.msg_complete = 0;
+	} else {
+		/* wait for next time the host buffer is empty */
+		return 0;
+	}
+
+	dev_dbg(&dev->pdev->dev, MEI_HDR_FMT,  MEI_HDR_PRM(&mei_hdr));
+
+	*slots -=  msg_slots;
+	if (mei_write_message(dev, &mei_hdr,
+		dev->iamthif_msg_buf + dev->iamthif_msg_buf_index)) {
+			dev->iamthif_state = MEI_IAMTHIF_IDLE;
+			cl->status = -ENODEV;
+			list_del(&cb->list);
+			return -ENODEV;
+	}
+
+	if (mei_cl_flow_ctrl_reduce(cl))
+		return -ENODEV;
+
+	dev->iamthif_msg_buf_index += mei_hdr.length;
+	cl->status = 0;
+
+	if (mei_hdr.msg_complete) {
+		dev->iamthif_state = MEI_IAMTHIF_FLOW_CONTROL;
+		dev->iamthif_flow_control_pending = true;
+
+		/* save iamthif cb sent to amthif client */
+		cb->buf_idx = dev->iamthif_msg_buf_index;
+		dev->iamthif_current_cb = cb;
+
+		list_move_tail(&cb->list, &dev->write_waiting_list.list);
+	}
+
+
+	return 0;
+}
+
+/**
+ * mei_amthif_irq_read_message - read routine after ISR to
+ *			handle the read amthif message
+ *
+ * @dev: the device structure
+ * @mei_hdr: header of amthif message
+ * @complete_list: An instance of our list structure
+ *
+ * returns 0 on success, <0 on failure.
+ */
+int mei_amthif_irq_read_msg(struct mei_device *dev,
+			    struct mei_msg_hdr *mei_hdr,
+			    struct mei_cl_cb *complete_list)
+{
+	struct mei_cl_cb *cb;
+	unsigned char *buffer;
+
+	BUG_ON(mei_hdr->me_addr != dev->iamthif_cl.me_client_id);
+	BUG_ON(dev->iamthif_state != MEI_IAMTHIF_READING);
+
+	buffer = dev->iamthif_msg_buf + dev->iamthif_msg_buf_index;
+	BUG_ON(dev->iamthif_mtu < dev->iamthif_msg_buf_index + mei_hdr->length);
+
+	mei_read_slots(dev, buffer, mei_hdr->length);
+
+	dev->iamthif_msg_buf_index += mei_hdr->length;
+
+	if (!mei_hdr->msg_complete)
+		return 0;
+
+	dev_dbg(&dev->pdev->dev, "amthif_message_buffer_index =%d\n",
+			mei_hdr->length);
+
+	dev_dbg(&dev->pdev->dev, "completed amthif read.\n ");
+	if (!dev->iamthif_current_cb)
+		return -ENODEV;
+
+	cb = dev->iamthif_current_cb;
+	dev->iamthif_current_cb = NULL;
+
+	if (!cb->cl)
+		return -ENODEV;
+
+	dev->iamthif_stall_timer = 0;
+	cb->buf_idx = dev->iamthif_msg_buf_index;
+	cb->read_time = jiffies;
+	if (dev->iamthif_ioctl && cb->cl == &dev->iamthif_cl) {
+		/* found the iamthif cb */
+		dev_dbg(&dev->pdev->dev, "complete the amthif read cb.\n ");
+		dev_dbg(&dev->pdev->dev, "add the amthif read cb to complete.\n ");
+		list_add_tail(&cb->list, &complete_list->list);
+	}
+	return 0;
+}
+
+/**
+ * mei_amthif_irq_read - prepares to read amthif data.
+ *
+ * @dev: the device structure.
+ * @slots: free slots.
+ *
+ * returns 0, OK; otherwise, error.
+ */
+int mei_amthif_irq_read(struct mei_device *dev, s32 *slots)
+{
+	u32 msg_slots = mei_data2slots(sizeof(struct hbm_flow_control));
+
+	if (*slots < msg_slots)
+		return -EMSGSIZE;
+
+	*slots -= msg_slots;
+
+	if (mei_hbm_cl_flow_control_req(dev, &dev->iamthif_cl)) {
+		dev_dbg(&dev->pdev->dev, "iamthif flow control failed\n");
+		return -EIO;
+	}
+
+	dev_dbg(&dev->pdev->dev, "iamthif flow control success\n");
+	dev->iamthif_state = MEI_IAMTHIF_READING;
+	dev->iamthif_flow_control_pending = false;
+	dev->iamthif_msg_buf_index = 0;
+	dev->iamthif_msg_buf_size = 0;
+	dev->iamthif_stall_timer = MEI_IAMTHIF_STALL_TIMER;
+	dev->hbuf_is_ready = mei_hbuf_is_ready(dev);
+	return 0;
+}
+
+/**
+ * mei_amthif_complete - complete amthif callback.
+ *
+ * @dev: the device structure.
+ * @cb_pos: callback block.
+ */
+void mei_amthif_complete(struct mei_device *dev, struct mei_cl_cb *cb)
+{
+	if (dev->iamthif_canceled != 1) {
+		dev->iamthif_state = MEI_IAMTHIF_READ_COMPLETE;
+		dev->iamthif_stall_timer = 0;
+		memcpy(cb->response_buffer.data,
+				dev->iamthif_msg_buf,
+				dev->iamthif_msg_buf_index);
+		list_add_tail(&cb->list, &dev->amthif_rd_complete_list.list);
+		dev_dbg(&dev->pdev->dev, "amthif read completed\n");
+		dev->iamthif_timer = jiffies;
+		dev_dbg(&dev->pdev->dev, "dev->iamthif_timer = %ld\n",
+				dev->iamthif_timer);
+	} else {
+		mei_amthif_run_next_cmd(dev);
+	}
+
+	dev_dbg(&dev->pdev->dev, "completing amthif call back.\n");
+	wake_up_interruptible(&dev->iamthif_cl.wait);
+}
+
+/**
+ * mei_clear_list - removes all callbacks associated with file
+ *		from mei_cb_list
+ *
+ * @dev: device structure.
+ * @file: file structure
+ * @mei_cb_list: callbacks list
+ *
+ * mei_clear_list is called to clear resources associated with file
+ * when application calls close function or Ctrl-C was pressed
+ *
+ * returns true if callback removed from the list, false otherwise
+ */
+static bool mei_clear_list(struct mei_device *dev,
+		const struct file *file, struct list_head *mei_cb_list)
+{
+	struct mei_cl_cb *cb_pos = NULL;
+	struct mei_cl_cb *cb_next = NULL;
+	bool removed = false;
+
+	/* list all list member */
+	list_for_each_entry_safe(cb_pos, cb_next, mei_cb_list, list) {
+		/* check if list member associated with a file */
+		if (file == cb_pos->file_object) {
+			/* remove member from the list */
+			list_del(&cb_pos->list);
+			/* check if cb equal to current iamthif cb */
+			if (dev->iamthif_current_cb == cb_pos) {
+				dev->iamthif_current_cb = NULL;
+				/* send flow control to iamthif client */
+				mei_hbm_cl_flow_control_req(dev,
+							&dev->iamthif_cl);
+			}
+			/* free all allocated buffers */
+			mei_io_cb_free(cb_pos);
+			cb_pos = NULL;
+			removed = true;
+		}
+	}
+	return removed;
+}
+
+/**
+ * mei_clear_lists - removes all callbacks associated with file
+ *
+ * @dev: device structure
+ * @file: file structure
+ *
+ * mei_clear_lists is called to clear resources associated with file
+ * when application calls close function or Ctrl-C was pressed
+ *
+ * returns true if callback removed from the list, false otherwise
+ */
+static bool mei_clear_lists(struct mei_device *dev, struct file *file)
+{
+	bool removed = false;
+
+	/* remove callbacks associated with a file */
+	mei_clear_list(dev, file, &dev->amthif_cmd_list.list);
+	if (mei_clear_list(dev, file, &dev->amthif_rd_complete_list.list))
+		removed = true;
+
+	mei_clear_list(dev, file, &dev->ctrl_rd_list.list);
+
+	if (mei_clear_list(dev, file, &dev->ctrl_wr_list.list))
+		removed = true;
+
+	if (mei_clear_list(dev, file, &dev->write_waiting_list.list))
+		removed = true;
+
+	if (mei_clear_list(dev, file, &dev->write_list.list))
+		removed = true;
+
+	/* check if iamthif_current_cb not NULL */
+	if (dev->iamthif_current_cb && !removed) {
+		/* check file and iamthif current cb association */
+		if (dev->iamthif_current_cb->file_object == file) {
+			/* remove cb */
+			mei_io_cb_free(dev->iamthif_current_cb);
+			dev->iamthif_current_cb = NULL;
+			removed = true;
+		}
+	}
+	return removed;
+}
+
+/**
+* mei_amthif_release - the release function
+*
+*  @dev: device structure
+*  @file: pointer to file structure
+*
+*  returns 0 on success, <0 on error
+*/
+int mei_amthif_release(struct mei_device *dev, struct file *file)
+{
+	if (dev->open_handle_count > 0)
+		dev->open_handle_count--;
+
+	if (dev->iamthif_file_object == file &&
+	    dev->iamthif_state != MEI_IAMTHIF_IDLE) {
+
+		dev_dbg(&dev->pdev->dev, "amthif canceled iamthif state %d\n",
+		    dev->iamthif_state);
+		dev->iamthif_canceled = true;
+		if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE) {
+			dev_dbg(&dev->pdev->dev, "run next amthif iamthif cb\n");
+			mei_amthif_run_next_cmd(dev);
+		}
+	}
+
+	if (mei_clear_lists(dev, file))
+		dev->iamthif_state = MEI_IAMTHIF_IDLE;
+
+	return 0;
+}

drivers/misc/mei/bus.c

@@ -0,0 +1,533 @@
+/*
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2012-2013, 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/module.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/mutex.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/mei_cl_bus.h>
+
+#include "mei_dev.h"
+#include "hw-me.h"
+#include "client.h"
+
+#define to_mei_cl_driver(d) container_of(d, struct mei_cl_driver, driver)
+#define to_mei_cl_device(d) container_of(d, struct mei_cl_device, dev)
+
+static int mei_cl_device_match(struct device *dev, struct device_driver *drv)
+{
+	struct mei_cl_device *device = to_mei_cl_device(dev);
+	struct mei_cl_driver *driver = to_mei_cl_driver(drv);
+	const struct mei_cl_device_id *id;
+
+	if (!device)
+		return 0;
+
+	if (!driver || !driver->id_table)
+		return 0;
+
+	id = driver->id_table;
+
+	while (id->name[0]) {
+		if (!strcmp(dev_name(dev), id->name))
+			return 1;
+
+		id++;
+	}
+
+	return 0;
+}
+
+static int mei_cl_device_probe(struct device *dev)
+{
+	struct mei_cl_device *device = to_mei_cl_device(dev);
+	struct mei_cl_driver *driver;
+	struct mei_cl_device_id id;
+
+	if (!device)
+		return 0;
+
+	driver = to_mei_cl_driver(dev->driver);
+	if (!driver || !driver->probe)
+		return -ENODEV;
+
+	dev_dbg(dev, "Device probe\n");
+
+	strncpy(id.name, dev_name(dev), MEI_CL_NAME_SIZE);
+
+	return driver->probe(device, &id);
+}
+
+static int mei_cl_device_remove(struct device *dev)
+{
+	struct mei_cl_device *device = to_mei_cl_device(dev);
+	struct mei_cl_driver *driver;
+
+	if (!device || !dev->driver)
+		return 0;
+
+	if (device->event_cb) {
+		device->event_cb = NULL;
+		cancel_work_sync(&device->event_work);
+	}
+
+	driver = to_mei_cl_driver(dev->driver);
+	if (!driver->remove) {
+		dev->driver = NULL;
+
+		return 0;
+	}
+
+	return driver->remove(device);
+}
+
+static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
+			     char *buf)
+{
+	int len;
+
+	len = snprintf(buf, PAGE_SIZE, "mei:%s\n", dev_name(dev));
+
+	return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
+}
+
+static struct device_attribute mei_cl_dev_attrs[] = {
+	__ATTR_RO(modalias),
+	__ATTR_NULL,
+};
+
+static int mei_cl_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+	if (add_uevent_var(env, "MODALIAS=mei:%s", dev_name(dev)))
+		return -ENOMEM;
+
+	return 0;
+}
+
+static struct bus_type mei_cl_bus_type = {
+	.name		= "mei",
+	.dev_attrs	= mei_cl_dev_attrs,
+	.match		= mei_cl_device_match,
+	.probe		= mei_cl_device_probe,
+	.remove		= mei_cl_device_remove,
+	.uevent		= mei_cl_uevent,
+};
+
+static void mei_cl_dev_release(struct device *dev)
+{
+	kfree(to_mei_cl_device(dev));
+}
+
+static struct device_type mei_cl_device_type = {
+	.release	= mei_cl_dev_release,
+};
+
+static struct mei_cl *mei_bus_find_mei_cl_by_uuid(struct mei_device *dev,
+						uuid_le uuid)
+{
+	struct mei_cl *cl, *next;
+
+	list_for_each_entry_safe(cl, next, &dev->device_list, device_link) {
+		if (!uuid_le_cmp(uuid, cl->device_uuid))
+			return cl;
+	}
+
+	return NULL;
+}
+struct mei_cl_device *mei_cl_add_device(struct mei_device *dev,
+					uuid_le uuid, char *name,
+					struct mei_cl_ops *ops)
+{
+	struct mei_cl_device *device;
+	struct mei_cl *cl;
+	int status;
+
+	cl = mei_bus_find_mei_cl_by_uuid(dev, uuid);
+	if (cl == NULL)
+		return NULL;
+
+	device = kzalloc(sizeof(struct mei_cl_device), GFP_KERNEL);
+	if (!device)
+		return NULL;
+
+	device->cl = cl;
+	device->ops = ops;
+
+	device->dev.parent = &dev->pdev->dev;
+	device->dev.bus = &mei_cl_bus_type;
+	device->dev.type = &mei_cl_device_type;
+
+	dev_set_name(&device->dev, "%s", name);
+
+	status = device_register(&device->dev);
+	if (status) {
+		dev_err(&dev->pdev->dev, "Failed to register MEI device\n");
+		kfree(device);
+		return NULL;
+	}
+
+	cl->device = device;
+
+	dev_dbg(&device->dev, "client %s registered\n", name);
+
+	return device;
+}
+EXPORT_SYMBOL_GPL(mei_cl_add_device);
+
+void mei_cl_remove_device(struct mei_cl_device *device)
+{
+	device_unregister(&device->dev);
+}
+EXPORT_SYMBOL_GPL(mei_cl_remove_device);
+
+int __mei_cl_driver_register(struct mei_cl_driver *driver, struct module *owner)
+{
+	int err;
+
+	driver->driver.name = driver->name;
+	driver->driver.owner = owner;
+	driver->driver.bus = &mei_cl_bus_type;
+
+	err = driver_register(&driver->driver);
+	if (err)
+		return err;
+
+	pr_debug("mei: driver [%s] registered\n", driver->driver.name);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(__mei_cl_driver_register);
+
+void mei_cl_driver_unregister(struct mei_cl_driver *driver)
+{
+	driver_unregister(&driver->driver);
+
+	pr_debug("mei: driver [%s] unregistered\n", driver->driver.name);
+}
+EXPORT_SYMBOL_GPL(mei_cl_driver_unregister);
+
+static int ___mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
+			bool blocking)
+{
+	struct mei_device *dev;
+	struct mei_cl_cb *cb;
+	int id;
+	int rets;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	if (cl->state != MEI_FILE_CONNECTED)
+		return -ENODEV;
+
+	/* Check if we have an ME client device */
+	id = mei_me_cl_by_id(dev, cl->me_client_id);
+	if (id < 0)
+		return -ENODEV;
+
+	if (length > dev->me_clients[id].props.max_msg_length)
+		return -EINVAL;
+
+	cb = mei_io_cb_init(cl, NULL);
+	if (!cb)
+		return -ENOMEM;
+
+	rets = mei_io_cb_alloc_req_buf(cb, length);
+	if (rets < 0) {
+		mei_io_cb_free(cb);
+		return rets;
+	}
+
+	memcpy(cb->request_buffer.data, buf, length);
+
+	mutex_lock(&dev->device_lock);
+
+	rets = mei_cl_write(cl, cb, blocking);
+
+	mutex_unlock(&dev->device_lock);
+	if (rets < 0)
+		mei_io_cb_free(cb);
+
+	return rets;
+}
+
+int __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length)
+{
+	struct mei_device *dev;
+	struct mei_cl_cb *cb;
+	size_t r_length;
+	int err;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	mutex_lock(&dev->device_lock);
+
+	if (!cl->read_cb) {
+		err = mei_cl_read_start(cl, length);
+		if (err < 0) {
+			mutex_unlock(&dev->device_lock);
+			return err;
+		}
+	}
+
+	if (cl->reading_state != MEI_READ_COMPLETE &&
+	    !waitqueue_active(&cl->rx_wait)) {
+
+		mutex_unlock(&dev->device_lock);
+
+		if (wait_event_interruptible(cl->rx_wait,
+				cl->reading_state == MEI_READ_COMPLETE  ||
+				mei_cl_is_transitioning(cl))) {
+
+			if (signal_pending(current))
+				return -EINTR;
+			return -ERESTARTSYS;
+		}
+
+		mutex_lock(&dev->device_lock);
+	}
+
+	cb = cl->read_cb;
+
+	if (cl->reading_state != MEI_READ_COMPLETE) {
+		r_length = 0;
+		goto out;
+	}
+
+	r_length = min_t(size_t, length, cb->buf_idx);
+
+	memcpy(buf, cb->response_buffer.data, r_length);
+
+	mei_io_cb_free(cb);
+	cl->reading_state = MEI_IDLE;
+	cl->read_cb = NULL;
+
+out:
+	mutex_unlock(&dev->device_lock);
+
+	return r_length;
+}
+
+inline int __mei_cl_async_send(struct mei_cl *cl, u8 *buf, size_t length)
+{
+	return ___mei_cl_send(cl, buf, length, 0);
+}
+
+inline int __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length)
+{
+	return ___mei_cl_send(cl, buf, length, 1);
+}
+
+int mei_cl_send(struct mei_cl_device *device, u8 *buf, size_t length)
+{
+	struct mei_cl *cl = device->cl;
+
+	if (cl == NULL)
+		return -ENODEV;
+
+	if (device->ops && device->ops->send)
+		return device->ops->send(device, buf, length);
+
+	return __mei_cl_send(cl, buf, length);
+}
+EXPORT_SYMBOL_GPL(mei_cl_send);
+
+int mei_cl_recv(struct mei_cl_device *device, u8 *buf, size_t length)
+{
+	struct mei_cl *cl =  device->cl;
+
+	if (cl == NULL)
+		return -ENODEV;
+
+	if (device->ops && device->ops->recv)
+		return device->ops->recv(device, buf, length);
+
+	return __mei_cl_recv(cl, buf, length);
+}
+EXPORT_SYMBOL_GPL(mei_cl_recv);
+
+static void mei_bus_event_work(struct work_struct *work)
+{
+	struct mei_cl_device *device;
+
+	device = container_of(work, struct mei_cl_device, event_work);
+
+	if (device->event_cb)
+		device->event_cb(device, device->events, device->event_context);
+
+	device->events = 0;
+
+	/* Prepare for the next read */
+	mei_cl_read_start(device->cl, 0);
+}
+
+int mei_cl_register_event_cb(struct mei_cl_device *device,
+			  mei_cl_event_cb_t event_cb, void *context)
+{
+	if (device->event_cb)
+		return -EALREADY;
+
+	device->events = 0;
+	device->event_cb = event_cb;
+	device->event_context = context;
+	INIT_WORK(&device->event_work, mei_bus_event_work);
+
+	mei_cl_read_start(device->cl, 0);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mei_cl_register_event_cb);
+
+void *mei_cl_get_drvdata(const struct mei_cl_device *device)
+{
+	return dev_get_drvdata(&device->dev);
+}
+EXPORT_SYMBOL_GPL(mei_cl_get_drvdata);
+
+void mei_cl_set_drvdata(struct mei_cl_device *device, void *data)
+{
+	dev_set_drvdata(&device->dev, data);
+}
+EXPORT_SYMBOL_GPL(mei_cl_set_drvdata);
+
+int mei_cl_enable_device(struct mei_cl_device *device)
+{
+	int err;
+	struct mei_device *dev;
+	struct mei_cl *cl = device->cl;
+
+	if (cl == NULL)
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	mutex_lock(&dev->device_lock);
+
+	cl->state = MEI_FILE_CONNECTING;
+
+	err = mei_cl_connect(cl, NULL);
+	if (err < 0) {
+		mutex_unlock(&dev->device_lock);
+		dev_err(&dev->pdev->dev, "Could not connect to the ME client");
+
+		return err;
+	}
+
+	mutex_unlock(&dev->device_lock);
+
+	if (device->event_cb && !cl->read_cb)
+		mei_cl_read_start(device->cl, 0);
+
+	if (!device->ops || !device->ops->enable)
+		return 0;
+
+	return device->ops->enable(device);
+}
+EXPORT_SYMBOL_GPL(mei_cl_enable_device);
+
+int mei_cl_disable_device(struct mei_cl_device *device)
+{
+	int err;
+	struct mei_device *dev;
+	struct mei_cl *cl = device->cl;
+
+	if (cl == NULL)
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	mutex_lock(&dev->device_lock);
+
+	if (cl->state != MEI_FILE_CONNECTED) {
+		mutex_unlock(&dev->device_lock);
+		dev_err(&dev->pdev->dev, "Already disconnected");
+
+		return 0;
+	}
+
+	cl->state = MEI_FILE_DISCONNECTING;
+
+	err = mei_cl_disconnect(cl);
+	if (err < 0) {
+		mutex_unlock(&dev->device_lock);
+		dev_err(&dev->pdev->dev,
+			"Could not disconnect from the ME client");
+
+		return err;
+	}
+
+	/* Flush queues and remove any pending read */
+	mei_cl_flush_queues(cl);
+
+	if (cl->read_cb) {
+		struct mei_cl_cb *cb = NULL;
+
+		cb = mei_cl_find_read_cb(cl);
+		/* Remove entry from read list */
+		if (cb)
+			list_del(&cb->list);
+
+		cb = cl->read_cb;
+		cl->read_cb = NULL;
+
+		if (cb) {
+			mei_io_cb_free(cb);
+			cb = NULL;
+		}
+	}
+
+	device->event_cb = NULL;
+
+	mutex_unlock(&dev->device_lock);
+
+	if (!device->ops || !device->ops->disable)
+		return 0;
+
+	return device->ops->disable(device);
+}
+EXPORT_SYMBOL_GPL(mei_cl_disable_device);
+
+void mei_cl_bus_rx_event(struct mei_cl *cl)
+{
+	struct mei_cl_device *device = cl->device;
+
+	if (!device || !device->event_cb)
+		return;
+
+	set_bit(MEI_CL_EVENT_RX, &device->events);
+
+	schedule_work(&device->event_work);
+}
+
+int __init mei_cl_bus_init(void)
+{
+	return bus_register(&mei_cl_bus_type);
+}
+
+void __exit mei_cl_bus_exit(void)
+{
+	bus_unregister(&mei_cl_bus_type);
+}

drivers/misc/mei/client.c

@@ -0,0 +1,839 @@
+/*
+ *
+ * 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/delay.h>
+
+#include <linux/mei.h>
+
+#include "mei_dev.h"
+#include "hbm.h"
+#include "client.h"
+
+/**
+ * mei_me_cl_by_uuid - locate index of me client
+ *
+ * @dev: mei device
+ * returns me client index or -ENOENT if not found
+ */
+int mei_me_cl_by_uuid(const struct mei_device *dev, const uuid_le *uuid)
+{
+	int i, res = -ENOENT;
+
+	for (i = 0; i < dev->me_clients_num; ++i)
+		if (uuid_le_cmp(*uuid,
+				dev->me_clients[i].props.protocol_name) == 0) {
+			res = i;
+			break;
+		}
+
+	return res;
+}
+
+
+/**
+ * mei_me_cl_by_id return index to me_clients for client_id
+ *
+ * @dev: the device structure
+ * @client_id: me client id
+ *
+ * Locking: called under "dev->device_lock" lock
+ *
+ * returns index on success, -ENOENT on failure.
+ */
+
+int mei_me_cl_by_id(struct mei_device *dev, u8 client_id)
+{
+	int i;
+	for (i = 0; i < dev->me_clients_num; i++)
+		if (dev->me_clients[i].client_id == client_id)
+			break;
+	if (WARN_ON(dev->me_clients[i].client_id != client_id))
+		return -ENOENT;
+
+	if (i == dev->me_clients_num)
+		return -ENOENT;
+
+	return i;
+}
+
+
+/**
+ * mei_io_list_flush - removes list entry belonging to cl.
+ *
+ * @list:  An instance of our list structure
+ * @cl: host client
+ */
+void mei_io_list_flush(struct mei_cl_cb *list, struct mei_cl *cl)
+{
+	struct mei_cl_cb *cb;
+	struct mei_cl_cb *next;
+
+	list_for_each_entry_safe(cb, next, &list->list, list) {
+		if (cb->cl && mei_cl_cmp_id(cl, cb->cl))
+			list_del(&cb->list);
+	}
+}
+
+/**
+ * mei_io_cb_free - free mei_cb_private related memory
+ *
+ * @cb: mei callback struct
+ */
+void mei_io_cb_free(struct mei_cl_cb *cb)
+{
+	if (cb == NULL)
+		return;
+
+	kfree(cb->request_buffer.data);
+	kfree(cb->response_buffer.data);
+	kfree(cb);
+}
+
+/**
+ * mei_io_cb_init - allocate and initialize io callback
+ *
+ * @cl - mei client
+ * @fp: pointer to file structure
+ *
+ * returns mei_cl_cb pointer or NULL;
+ */
+struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl, struct file *fp)
+{
+	struct mei_cl_cb *cb;
+
+	cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
+	if (!cb)
+		return NULL;
+
+	mei_io_list_init(cb);
+
+	cb->file_object = fp;
+	cb->cl = cl;
+	cb->buf_idx = 0;
+	return cb;
+}
+
+/**
+ * mei_io_cb_alloc_req_buf - allocate request buffer
+ *
+ * @cb: io callback structure
+ * @length: size of the buffer
+ *
+ * returns 0 on success
+ *         -EINVAL if cb is NULL
+ *         -ENOMEM if allocation failed
+ */
+int mei_io_cb_alloc_req_buf(struct mei_cl_cb *cb, size_t length)
+{
+	if (!cb)
+		return -EINVAL;
+
+	if (length == 0)
+		return 0;
+
+	cb->request_buffer.data = kmalloc(length, GFP_KERNEL);
+	if (!cb->request_buffer.data)
+		return -ENOMEM;
+	cb->request_buffer.size = length;
+	return 0;
+}
+/**
+ * mei_io_cb_alloc_resp_buf - allocate respose buffer
+ *
+ * @cb: io callback structure
+ * @length: size of the buffer
+ *
+ * returns 0 on success
+ *         -EINVAL if cb is NULL
+ *         -ENOMEM if allocation failed
+ */
+int mei_io_cb_alloc_resp_buf(struct mei_cl_cb *cb, size_t length)
+{
+	if (!cb)
+		return -EINVAL;
+
+	if (length == 0)
+		return 0;
+
+	cb->response_buffer.data = kmalloc(length, GFP_KERNEL);
+	if (!cb->response_buffer.data)
+		return -ENOMEM;
+	cb->response_buffer.size = length;
+	return 0;
+}
+
+
+
+/**
+ * mei_cl_flush_queues - flushes queue lists belonging to cl.
+ *
+ * @cl: host client
+ */
+int mei_cl_flush_queues(struct mei_cl *cl)
+{
+	if (WARN_ON(!cl || !cl->dev))
+		return -EINVAL;
+
+	dev_dbg(&cl->dev->pdev->dev, "remove list entry belonging to cl\n");
+	mei_io_list_flush(&cl->dev->read_list, cl);
+	mei_io_list_flush(&cl->dev->write_list, cl);
+	mei_io_list_flush(&cl->dev->write_waiting_list, cl);
+	mei_io_list_flush(&cl->dev->ctrl_wr_list, cl);
+	mei_io_list_flush(&cl->dev->ctrl_rd_list, cl);
+	mei_io_list_flush(&cl->dev->amthif_cmd_list, cl);
+	mei_io_list_flush(&cl->dev->amthif_rd_complete_list, cl);
+	return 0;
+}
+
+
+/**
+ * mei_cl_init - initializes intialize cl.
+ *
+ * @cl: host client to be initialized
+ * @dev: mei device
+ */
+void mei_cl_init(struct mei_cl *cl, struct mei_device *dev)
+{
+	memset(cl, 0, sizeof(struct mei_cl));
+	init_waitqueue_head(&cl->wait);
+	init_waitqueue_head(&cl->rx_wait);
+	init_waitqueue_head(&cl->tx_wait);
+	INIT_LIST_HEAD(&cl->link);
+	INIT_LIST_HEAD(&cl->device_link);
+	cl->reading_state = MEI_IDLE;
+	cl->writing_state = MEI_IDLE;
+	cl->dev = dev;
+}
+
+/**
+ * mei_cl_allocate - allocates cl  structure and sets it up.
+ *
+ * @dev: mei device
+ * returns  The allocated file or NULL on failure
+ */
+struct mei_cl *mei_cl_allocate(struct mei_device *dev)
+{
+	struct mei_cl *cl;
+
+	cl = kmalloc(sizeof(struct mei_cl), GFP_KERNEL);
+	if (!cl)
+		return NULL;
+
+	mei_cl_init(cl, dev);
+
+	return cl;
+}
+
+/**
+ * mei_cl_find_read_cb - find this cl's callback in the read list
+ *
+ * @cl: host client
+ *
+ * returns cb on success, NULL on error
+ */
+struct mei_cl_cb *mei_cl_find_read_cb(struct mei_cl *cl)
+{
+	struct mei_device *dev = cl->dev;
+	struct mei_cl_cb *cb = NULL;
+	struct mei_cl_cb *next = NULL;
+
+	list_for_each_entry_safe(cb, next, &dev->read_list.list, list)
+		if (mei_cl_cmp_id(cl, cb->cl))
+			return cb;
+	return NULL;
+}
+
+/** mei_cl_link: allocte host id in the host map
+ *
+ * @cl - host client
+ * @id - fixed host id or -1 for genereting one
+ *
+ * returns 0 on success
+ *	-EINVAL on incorrect values
+ *	-ENONET if client not found
+ */
+int mei_cl_link(struct mei_cl *cl, int id)
+{
+	struct mei_device *dev;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -EINVAL;
+
+	dev = cl->dev;
+
+	/* If Id is not asigned get one*/
+	if (id == MEI_HOST_CLIENT_ID_ANY)
+		id = find_first_zero_bit(dev->host_clients_map,
+					MEI_CLIENTS_MAX);
+
+	if (id >= MEI_CLIENTS_MAX) {
+		dev_err(&dev->pdev->dev, "id exceded %d", MEI_CLIENTS_MAX) ;
+		return -ENOENT;
+	}
+
+	dev->open_handle_count++;
+
+	cl->host_client_id = id;
+	list_add_tail(&cl->link, &dev->file_list);
+
+	set_bit(id, dev->host_clients_map);
+
+	cl->state = MEI_FILE_INITIALIZING;
+
+	dev_dbg(&dev->pdev->dev, "link cl host id = %d\n", cl->host_client_id);
+	return 0;
+}
+
+/**
+ * mei_cl_unlink - remove me_cl from the list
+ *
+ * @cl: host client
+ */
+int mei_cl_unlink(struct mei_cl *cl)
+{
+	struct mei_device *dev;
+	struct mei_cl *pos, *next;
+
+	/* don't shout on error exit path */
+	if (!cl)
+		return 0;
+
+	/* wd and amthif might not be initialized */
+	if (!cl->dev)
+		return 0;
+
+	dev = cl->dev;
+
+	list_for_each_entry_safe(pos, next, &dev->file_list, link) {
+		if (cl->host_client_id == pos->host_client_id) {
+			dev_dbg(&dev->pdev->dev, "remove host client = %d, ME client = %d\n",
+				pos->host_client_id, pos->me_client_id);
+			list_del_init(&pos->link);
+			break;
+		}
+	}
+	return 0;
+}
+
+
+void mei_host_client_init(struct work_struct *work)
+{
+	struct mei_device *dev = container_of(work,
+					      struct mei_device, init_work);
+	struct mei_client_properties *client_props;
+	int i;
+
+	mutex_lock(&dev->device_lock);
+
+	bitmap_zero(dev->host_clients_map, MEI_CLIENTS_MAX);
+	dev->open_handle_count = 0;
+
+	/*
+	 * Reserving the first three client IDs
+	 * 0: Reserved for MEI Bus Message communications
+	 * 1: Reserved for Watchdog
+	 * 2: Reserved for AMTHI
+	 */
+	bitmap_set(dev->host_clients_map, 0, 3);
+
+	for (i = 0; i < dev->me_clients_num; i++) {
+		client_props = &dev->me_clients[i].props;
+
+		if (!uuid_le_cmp(client_props->protocol_name, mei_amthif_guid))
+			mei_amthif_host_init(dev);
+		else if (!uuid_le_cmp(client_props->protocol_name, mei_wd_guid))
+			mei_wd_host_init(dev);
+		else if (!uuid_le_cmp(client_props->protocol_name, mei_nfc_guid))
+			mei_nfc_host_init(dev);
+
+	}
+
+	dev->dev_state = MEI_DEV_ENABLED;
+
+	mutex_unlock(&dev->device_lock);
+}
+
+
+/**
+ * mei_cl_disconnect - disconnect host clinet form the me one
+ *
+ * @cl: host client
+ *
+ * Locking: called under "dev->device_lock" lock
+ *
+ * returns 0 on success, <0 on failure.
+ */
+int mei_cl_disconnect(struct mei_cl *cl)
+{
+	struct mei_device *dev;
+	struct mei_cl_cb *cb;
+	int rets, err;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	if (cl->state != MEI_FILE_DISCONNECTING)
+		return 0;
+
+	cb = mei_io_cb_init(cl, NULL);
+	if (!cb)
+		return -ENOMEM;
+
+	cb->fop_type = MEI_FOP_CLOSE;
+	if (dev->hbuf_is_ready) {
+		dev->hbuf_is_ready = false;
+		if (mei_hbm_cl_disconnect_req(dev, cl)) {
+			rets = -ENODEV;
+			dev_err(&dev->pdev->dev, "failed to disconnect.\n");
+			goto free;
+		}
+		mdelay(10); /* Wait for hardware disconnection ready */
+		list_add_tail(&cb->list, &dev->ctrl_rd_list.list);
+	} else {
+		dev_dbg(&dev->pdev->dev, "add disconnect cb to control write list\n");
+		list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
+
+	}
+	mutex_unlock(&dev->device_lock);
+
+	err = wait_event_timeout(dev->wait_recvd_msg,
+			MEI_FILE_DISCONNECTED == cl->state,
+			mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
+
+	mutex_lock(&dev->device_lock);
+	if (MEI_FILE_DISCONNECTED == cl->state) {
+		rets = 0;
+		dev_dbg(&dev->pdev->dev, "successfully disconnected from FW client.\n");
+	} else {
+		rets = -ENODEV;
+		if (MEI_FILE_DISCONNECTED != cl->state)
+			dev_dbg(&dev->pdev->dev, "wrong status client disconnect.\n");
+
+		if (err)
+			dev_dbg(&dev->pdev->dev,
+					"wait failed disconnect err=%08x\n",
+					err);
+
+		dev_dbg(&dev->pdev->dev, "failed to disconnect from FW client.\n");
+	}
+
+	mei_io_list_flush(&dev->ctrl_rd_list, cl);
+	mei_io_list_flush(&dev->ctrl_wr_list, cl);
+free:
+	mei_io_cb_free(cb);
+	return rets;
+}
+
+
+/**
+ * mei_cl_is_other_connecting - checks if other
+ *    client with the same me client id is connecting
+ *
+ * @cl: private data of the file object
+ *
+ * returns ture if other client is connected, 0 - otherwise.
+ */
+bool mei_cl_is_other_connecting(struct mei_cl *cl)
+{
+	struct mei_device *dev;
+	struct mei_cl *pos;
+	struct mei_cl *next;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return false;
+
+	dev = cl->dev;
+
+	list_for_each_entry_safe(pos, next, &dev->file_list, link) {
+		if ((pos->state == MEI_FILE_CONNECTING) &&
+		    (pos != cl) && cl->me_client_id == pos->me_client_id)
+			return true;
+
+	}
+
+	return false;
+}
+
+/**
+ * mei_cl_connect - connect host clinet to the me one
+ *
+ * @cl: host client
+ *
+ * Locking: called under "dev->device_lock" lock
+ *
+ * returns 0 on success, <0 on failure.
+ */
+int mei_cl_connect(struct mei_cl *cl, struct file *file)
+{
+	struct mei_device *dev;
+	struct mei_cl_cb *cb;
+	long timeout = mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT);
+	int rets;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	cb = mei_io_cb_init(cl, file);
+	if (!cb) {
+		rets = -ENOMEM;
+		goto out;
+	}
+
+	cb->fop_type = MEI_FOP_IOCTL;
+
+	if (dev->hbuf_is_ready && !mei_cl_is_other_connecting(cl)) {
+		dev->hbuf_is_ready = false;
+
+		if (mei_hbm_cl_connect_req(dev, cl)) {
+			rets = -ENODEV;
+			goto out;
+		}
+		cl->timer_count = MEI_CONNECT_TIMEOUT;
+		list_add_tail(&cb->list, &dev->ctrl_rd_list.list);
+	} else {
+		list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
+	}
+
+	mutex_unlock(&dev->device_lock);
+	rets = wait_event_timeout(dev->wait_recvd_msg,
+				 (cl->state == MEI_FILE_CONNECTED ||
+				  cl->state == MEI_FILE_DISCONNECTED),
+				 timeout * HZ);
+	mutex_lock(&dev->device_lock);
+
+	if (cl->state != MEI_FILE_CONNECTED) {
+		rets = -EFAULT;
+
+		mei_io_list_flush(&dev->ctrl_rd_list, cl);
+		mei_io_list_flush(&dev->ctrl_wr_list, cl);
+		goto out;
+	}
+
+	rets = cl->status;
+
+out:
+	mei_io_cb_free(cb);
+	return rets;
+}
+
+/**
+ * mei_cl_flow_ctrl_creds - checks flow_control credits for cl.
+ *
+ * @cl: private data of the file object
+ *
+ * returns 1 if mei_flow_ctrl_creds >0, 0 - otherwise.
+ *	-ENOENT if mei_cl is not present
+ *	-EINVAL if single_recv_buf == 0
+ */
+int mei_cl_flow_ctrl_creds(struct mei_cl *cl)
+{
+	struct mei_device *dev;
+	int i;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -EINVAL;
+
+	dev = cl->dev;
+
+	if (!dev->me_clients_num)
+		return 0;
+
+	if (cl->mei_flow_ctrl_creds > 0)
+		return 1;
+
+	for (i = 0; i < dev->me_clients_num; i++) {
+		struct mei_me_client  *me_cl = &dev->me_clients[i];
+		if (me_cl->client_id == cl->me_client_id) {
+			if (me_cl->mei_flow_ctrl_creds) {
+				if (WARN_ON(me_cl->props.single_recv_buf == 0))
+					return -EINVAL;
+				return 1;
+			} else {
+				return 0;
+			}
+		}
+	}
+	return -ENOENT;
+}
+
+/**
+ * mei_cl_flow_ctrl_reduce - reduces flow_control.
+ *
+ * @cl: private data of the file object
+ *
+ * @returns
+ *	0 on success
+ *	-ENOENT when me client is not found
+ *	-EINVAL when ctrl credits are <= 0
+ */
+int mei_cl_flow_ctrl_reduce(struct mei_cl *cl)
+{
+	struct mei_device *dev;
+	int i;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -EINVAL;
+
+	dev = cl->dev;
+
+	if (!dev->me_clients_num)
+		return -ENOENT;
+
+	for (i = 0; i < dev->me_clients_num; i++) {
+		struct mei_me_client  *me_cl = &dev->me_clients[i];
+		if (me_cl->client_id == cl->me_client_id) {
+			if (me_cl->props.single_recv_buf != 0) {
+				if (WARN_ON(me_cl->mei_flow_ctrl_creds <= 0))
+					return -EINVAL;
+				dev->me_clients[i].mei_flow_ctrl_creds--;
+			} else {
+				if (WARN_ON(cl->mei_flow_ctrl_creds <= 0))
+					return -EINVAL;
+				cl->mei_flow_ctrl_creds--;
+			}
+			return 0;
+		}
+	}
+	return -ENOENT;
+}
+
+/**
+ * mei_cl_read_start - the start read client message function.
+ *
+ * @cl: host client
+ *
+ * returns 0 on success, <0 on failure.
+ */
+int mei_cl_read_start(struct mei_cl *cl, size_t length)
+{
+	struct mei_device *dev;
+	struct mei_cl_cb *cb;
+	int rets;
+	int i;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	if (cl->state != MEI_FILE_CONNECTED)
+		return -ENODEV;
+
+	if (dev->dev_state != MEI_DEV_ENABLED)
+		return -ENODEV;
+
+	if (cl->read_cb) {
+		dev_dbg(&dev->pdev->dev, "read is pending.\n");
+		return -EBUSY;
+	}
+	i = mei_me_cl_by_id(dev, cl->me_client_id);
+	if (i < 0) {
+		dev_err(&dev->pdev->dev, "no such me client %d\n",
+			cl->me_client_id);
+		return  -ENODEV;
+	}
+
+	cb = mei_io_cb_init(cl, NULL);
+	if (!cb)
+		return -ENOMEM;
+
+	/* always allocate at least client max message */
+	length = max_t(size_t, length, dev->me_clients[i].props.max_msg_length);
+	rets = mei_io_cb_alloc_resp_buf(cb, length);
+	if (rets)
+		goto err;
+
+	cb->fop_type = MEI_FOP_READ;
+	cl->read_cb = cb;
+	if (dev->hbuf_is_ready) {
+		dev->hbuf_is_ready = false;
+		if (mei_hbm_cl_flow_control_req(dev, cl)) {
+			rets = -ENODEV;
+			goto err;
+		}
+		list_add_tail(&cb->list, &dev->read_list.list);
+	} else {
+		list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
+	}
+	return rets;
+err:
+	mei_io_cb_free(cb);
+	return rets;
+}
+
+/**
+ * mei_cl_write - submit a write cb to mei device
+	assumes device_lock is locked
+ *
+ * @cl: host client
+ * @cl: write callback with filled data
+ *
+ * returns numbe of bytes sent on success, <0 on failure.
+ */
+int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking)
+{
+	struct mei_device *dev;
+	struct mei_msg_data *buf;
+	struct mei_msg_hdr mei_hdr;
+	int rets;
+
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	if (WARN_ON(!cb))
+		return -EINVAL;
+
+	dev = cl->dev;
+
+
+	buf = &cb->request_buffer;
+
+	dev_dbg(&dev->pdev->dev, "mei_cl_write %d\n", buf->size);
+
+
+	cb->fop_type = MEI_FOP_WRITE;
+
+	rets = mei_cl_flow_ctrl_creds(cl);
+	if (rets < 0)
+		goto err;
+
+	/* Host buffer is not ready, we queue the request */
+	if (rets == 0 || !dev->hbuf_is_ready) {
+		cb->buf_idx = 0;
+		/* unseting complete will enqueue the cb for write */
+		mei_hdr.msg_complete = 0;
+		cl->writing_state = MEI_WRITING;
+		rets = buf->size;
+		goto out;
+	}
+
+	dev->hbuf_is_ready = false;
+
+	/* Check for a maximum length */
+	if (buf->size > mei_hbuf_max_len(dev)) {
+		mei_hdr.length = mei_hbuf_max_len(dev);
+		mei_hdr.msg_complete = 0;
+	} else {
+		mei_hdr.length = buf->size;
+		mei_hdr.msg_complete = 1;
+	}
+
+	mei_hdr.host_addr = cl->host_client_id;
+	mei_hdr.me_addr = cl->me_client_id;
+	mei_hdr.reserved = 0;
+
+	dev_dbg(&dev->pdev->dev, "write " MEI_HDR_FMT "\n",
+		MEI_HDR_PRM(&mei_hdr));
+
+
+	if (mei_write_message(dev, &mei_hdr, buf->data)) {
+		rets = -EIO;
+		goto err;
+	}
+
+	cl->writing_state = MEI_WRITING;
+	cb->buf_idx = mei_hdr.length;
+
+	rets = buf->size;
+out:
+	if (mei_hdr.msg_complete) {
+		if (mei_cl_flow_ctrl_reduce(cl)) {
+			rets = -ENODEV;
+			goto err;
+		}
+		list_add_tail(&cb->list, &dev->write_waiting_list.list);
+	} else {
+		list_add_tail(&cb->list, &dev->write_list.list);
+	}
+
+
+	if (blocking && cl->writing_state != MEI_WRITE_COMPLETE) {
+
+		mutex_unlock(&dev->device_lock);
+		if (wait_event_interruptible(cl->tx_wait,
+			cl->writing_state == MEI_WRITE_COMPLETE)) {
+				if (signal_pending(current))
+					rets = -EINTR;
+				else
+					rets = -ERESTARTSYS;
+		}
+		mutex_lock(&dev->device_lock);
+	}
+err:
+	return rets;
+}
+
+
+
+/**
+ * mei_cl_all_disconnect - disconnect forcefully all connected clients
+ *
+ * @dev - mei device
+ */
+
+void mei_cl_all_disconnect(struct mei_device *dev)
+{
+	struct mei_cl *cl, *next;
+
+	list_for_each_entry_safe(cl, next, &dev->file_list, link) {
+		cl->state = MEI_FILE_DISCONNECTED;
+		cl->mei_flow_ctrl_creds = 0;
+		cl->read_cb = NULL;
+		cl->timer_count = 0;
+	}
+}
+
+
+/**
+ * mei_cl_all_read_wakeup  - wake up all readings so they can be interrupted
+ *
+ * @dev  - mei device
+ */
+void mei_cl_all_read_wakeup(struct mei_device *dev)
+{
+	struct mei_cl *cl, *next;
+	list_for_each_entry_safe(cl, next, &dev->file_list, link) {
+		if (waitqueue_active(&cl->rx_wait)) {
+			dev_dbg(&dev->pdev->dev, "Waking up client!\n");
+			wake_up_interruptible(&cl->rx_wait);
+		}
+	}
+}
+
+/**
+ * mei_cl_all_write_clear - clear all pending writes
+
+ * @dev - mei device
+ */
+void mei_cl_all_write_clear(struct mei_device *dev)
+{
+	struct mei_cl_cb *cb, *next;
+
+	list_for_each_entry_safe(cb, next, &dev->write_list.list, list) {
+		list_del(&cb->list);
+		mei_io_cb_free(cb);
+	}
+}
+
+

drivers/misc/mei/client.h

@@ -0,0 +1,107 @@
+/*
+ *
+ * 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.
+ *
+ */
+
+#ifndef _MEI_CLIENT_H_
+#define _MEI_CLIENT_H_
+
+#include <linux/types.h>
+#include <linux/watchdog.h>
+#include <linux/poll.h>
+#include <linux/mei.h>
+
+#include "mei_dev.h"
+
+int mei_me_cl_by_uuid(const struct mei_device *dev, const uuid_le *cuuid);
+int mei_me_cl_by_id(struct mei_device *dev, u8 client_id);
+
+/*
+ * MEI IO Functions
+ */
+struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl, struct file *fp);
+void mei_io_cb_free(struct mei_cl_cb *priv_cb);
+int mei_io_cb_alloc_req_buf(struct mei_cl_cb *cb, size_t length);
+int mei_io_cb_alloc_resp_buf(struct mei_cl_cb *cb, size_t length);
+
+
+/**
+ * mei_io_list_init - Sets up a queue list.
+ *
+ * @list: An instance cl callback structure
+ */
+static inline void mei_io_list_init(struct mei_cl_cb *list)
+{
+	INIT_LIST_HEAD(&list->list);
+}
+void mei_io_list_flush(struct mei_cl_cb *list, struct mei_cl *cl);
+
+/*
+ * MEI Host Client Functions
+ */
+
+struct mei_cl *mei_cl_allocate(struct mei_device *dev);
+void mei_cl_init(struct mei_cl *cl, struct mei_device *dev);
+
+
+int mei_cl_link(struct mei_cl *cl, int id);
+int mei_cl_unlink(struct mei_cl *cl);
+
+int mei_cl_flush_queues(struct mei_cl *cl);
+struct mei_cl_cb *mei_cl_find_read_cb(struct mei_cl *cl);
+
+/**
+ * mei_cl_cmp_id - tells if file private data have same id
+ *
+ * @fe1: private data of 1. file object
+ * @fe2: private data of 2. file object
+ *
+ * returns true  - if ids are the same and not NULL
+ */
+static inline bool mei_cl_cmp_id(const struct mei_cl *cl1,
+				const struct mei_cl *cl2)
+{
+	return cl1 && cl2 &&
+		(cl1->host_client_id == cl2->host_client_id) &&
+		(cl1->me_client_id == cl2->me_client_id);
+}
+static inline bool mei_cl_is_transitioning(struct mei_cl *cl)
+{
+	return (MEI_FILE_INITIALIZING == cl->state ||
+		MEI_FILE_DISCONNECTED == cl->state ||
+		MEI_FILE_DISCONNECTING == cl->state);
+}
+
+
+int mei_cl_flow_ctrl_creds(struct mei_cl *cl);
+
+int mei_cl_flow_ctrl_reduce(struct mei_cl *cl);
+/*
+ *  MEI input output function prototype
+ */
+bool mei_cl_is_other_connecting(struct mei_cl *cl);
+int mei_cl_disconnect(struct mei_cl *cl);
+int mei_cl_connect(struct mei_cl *cl, struct file *file);
+int mei_cl_read_start(struct mei_cl *cl, size_t length);
+int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking);
+
+void mei_host_client_init(struct work_struct *work);
+
+
+
+void mei_cl_all_disconnect(struct mei_device *dev);
+void mei_cl_all_read_wakeup(struct mei_device *dev);
+void mei_cl_all_write_clear(struct mei_device *dev);
+
+#endif /* _MEI_CLIENT_H_ */

drivers/misc/mei/debugfs.c

@@ -0,0 +1,143 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2012-2013, 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/slab.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/debugfs.h>
+#include <linux/pci.h>
+
+#include <linux/mei.h>
+
+#include "mei_dev.h"
+#include "hw.h"
+
+static ssize_t mei_dbgfs_read_meclients(struct file *fp, char __user *ubuf,
+					size_t cnt, loff_t *ppos)
+{
+	struct mei_device *dev = fp->private_data;
+	struct mei_me_client *cl;
+	const size_t bufsz = 1024;
+	char *buf = kzalloc(bufsz, GFP_KERNEL);
+	int i;
+	int pos = 0;
+	int ret;
+
+	if  (!buf)
+		return -ENOMEM;
+
+	pos += scnprintf(buf + pos, bufsz - pos,
+			"  |id|addr|         UUID                       |con|msg len|\n");
+
+	mutex_lock(&dev->device_lock);
+
+	/*  if the driver is not enabled the list won't b consitent */
+	if (dev->dev_state != MEI_DEV_ENABLED)
+		goto out;
+
+	for (i = 0; i < dev->me_clients_num; i++) {
+		cl = &dev->me_clients[i];
+
+		/* skip me clients that cannot be connected */
+		if (cl->props.max_number_of_connections == 0)
+			continue;
+
+		pos += scnprintf(buf + pos, bufsz - pos,
+			"%2d|%2d|%4d|%pUl|%3d|%7d|\n",
+			i, cl->client_id,
+			cl->props.fixed_address,
+			&cl->props.protocol_name,
+			cl->props.max_number_of_connections,
+			cl->props.max_msg_length);
+	}
+out:
+	mutex_unlock(&dev->device_lock);
+	ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
+	kfree(buf);
+	return ret;
+}
+
+static const struct file_operations mei_dbgfs_fops_meclients = {
+	.open = simple_open,
+	.read = mei_dbgfs_read_meclients,
+	.llseek = generic_file_llseek,
+};
+
+static ssize_t mei_dbgfs_read_devstate(struct file *fp, char __user *ubuf,
+					size_t cnt, loff_t *ppos)
+{
+	struct mei_device *dev = fp->private_data;
+	const size_t bufsz = 1024;
+	char *buf = kzalloc(bufsz, GFP_KERNEL);
+	int pos = 0;
+	int ret;
+
+	if  (!buf)
+		return -ENOMEM;
+
+	pos += scnprintf(buf + pos, bufsz - pos, "%s\n",
+			mei_dev_state_str(dev->dev_state));
+	ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
+	kfree(buf);
+	return ret;
+}
+static const struct file_operations mei_dbgfs_fops_devstate = {
+	.open = simple_open,
+	.read = mei_dbgfs_read_devstate,
+	.llseek = generic_file_llseek,
+};
+
+/**
+ * mei_dbgfs_deregister - Remove the debugfs files and directories
+ * @mei - pointer to mei device private dat
+ */
+void mei_dbgfs_deregister(struct mei_device *dev)
+{
+	if (!dev->dbgfs_dir)
+		return;
+	debugfs_remove_recursive(dev->dbgfs_dir);
+	dev->dbgfs_dir = NULL;
+}
+
+/**
+ * Add the debugfs files
+ *
+ */
+int mei_dbgfs_register(struct mei_device *dev, const char *name)
+{
+	struct dentry *dir, *f;
+	dir = debugfs_create_dir(name, NULL);
+	if (!dir)
+		return -ENOMEM;
+
+	f = debugfs_create_file("meclients", S_IRUSR, dir,
+				dev, &mei_dbgfs_fops_meclients);
+	if (!f) {
+		dev_err(&dev->pdev->dev, "meclients: registration failed\n");
+		goto err;
+	}
+	f = debugfs_create_file("devstate", S_IRUSR, dir,
+				dev, &mei_dbgfs_fops_devstate);
+	if (!f) {
+		dev_err(&dev->pdev->dev, "devstate: registration failed\n");
+		goto err;
+	}
+	dev->dbgfs_dir = dir;
+	return 0;
+err:
+	mei_dbgfs_deregister(dev);
+	return -ENODEV;
+}
+

drivers/misc/mei/hbm.c

@@ -0,0 +1,696 @@
+/*
+ *
+ * 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 "hbm.h"
+#include "hw-me.h"
+
+/**
+ * mei_hbm_me_cl_allocate - allocates storage for me clients
+ *
+ * @dev: the device structure
+ *
+ * returns none.
+ */
+static void mei_hbm_me_cl_allocate(struct mei_device *dev)
+{
+	struct mei_me_client *clients;
+	int b;
+
+	dev->me_clients_num = 0;
+	dev->me_client_presentation_num = 0;
+	dev->me_client_index = 0;
+
+	/* count how many ME clients we have */
+	for_each_set_bit(b, dev->me_clients_map, MEI_CLIENTS_MAX)
+		dev->me_clients_num++;
+
+	if (dev->me_clients_num == 0)
+		return;
+
+	kfree(dev->me_clients);
+	dev->me_clients = NULL;
+
+	dev_dbg(&dev->pdev->dev, "memory allocation for ME clients size=%zd.\n",
+		dev->me_clients_num * sizeof(struct mei_me_client));
+	/* allocate storage for ME clients representation */
+	clients = kcalloc(dev->me_clients_num,
+			sizeof(struct mei_me_client), GFP_KERNEL);
+	if (!clients) {
+		dev_err(&dev->pdev->dev, "memory allocation for ME clients failed.\n");
+		dev->dev_state = MEI_DEV_RESETTING;
+		mei_reset(dev, 1);
+		return;
+	}
+	dev->me_clients = clients;
+	return;
+}
+
+/**
+ * mei_hbm_cl_hdr - construct client hbm header
+ *
+ * @cl: - client
+ * @hbm_cmd: host bus message command
+ * @buf: buffer for cl header
+ * @len: buffer length
+ */
+static inline
+void mei_hbm_cl_hdr(struct mei_cl *cl, u8 hbm_cmd, void *buf, size_t len)
+{
+	struct mei_hbm_cl_cmd *cmd = buf;
+
+	memset(cmd, 0, len);
+
+	cmd->hbm_cmd = hbm_cmd;
+	cmd->host_addr = cl->host_client_id;
+	cmd->me_addr = cl->me_client_id;
+}
+
+/**
+ * same_disconn_addr - tells if they have the same address
+ *
+ * @file: private data of the file object.
+ * @disconn: disconnection request.
+ *
+ * returns true if addres are same
+ */
+static inline
+bool mei_hbm_cl_addr_equal(struct mei_cl *cl, void *buf)
+{
+	struct mei_hbm_cl_cmd *cmd = buf;
+	return cl->host_client_id == cmd->host_addr &&
+		cl->me_client_id == cmd->me_addr;
+}
+
+
+/**
+ * is_treat_specially_client - checks if the message belongs
+ * to the file private data.
+ *
+ * @cl: private data of the file object
+ * @rs: connect response bus message
+ *
+ */
+static bool is_treat_specially_client(struct mei_cl *cl,
+		struct hbm_client_connect_response *rs)
+{
+	if (mei_hbm_cl_addr_equal(cl, rs)) {
+		if (!rs->status) {
+			cl->state = MEI_FILE_CONNECTED;
+			cl->status = 0;
+
+		} else {
+			cl->state = MEI_FILE_DISCONNECTED;
+			cl->status = -ENODEV;
+		}
+		cl->timer_count = 0;
+
+		return true;
+	}
+	return false;
+}
+
+int mei_hbm_start_wait(struct mei_device *dev)
+{
+	int ret;
+	if (dev->hbm_state > MEI_HBM_START)
+		return 0;
+
+	mutex_unlock(&dev->device_lock);
+	ret = wait_event_interruptible_timeout(dev->wait_recvd_msg,
+			dev->hbm_state == MEI_HBM_IDLE ||
+			dev->hbm_state > MEI_HBM_START,
+			mei_secs_to_jiffies(MEI_INTEROP_TIMEOUT));
+	mutex_lock(&dev->device_lock);
+
+	if (ret <= 0 && (dev->hbm_state <= MEI_HBM_START)) {
+		dev->hbm_state = MEI_HBM_IDLE;
+		dev_err(&dev->pdev->dev, "wating for mei start failed\n");
+		return -ETIMEDOUT;
+	}
+	return 0;
+}
+
+/**
+ * mei_hbm_start_req - sends start request message.
+ *
+ * @dev: the device structure
+ */
+int mei_hbm_start_req(struct mei_device *dev)
+{
+	struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
+	struct hbm_host_version_request *start_req;
+	const size_t len = sizeof(struct hbm_host_version_request);
+
+	mei_hbm_hdr(mei_hdr, len);
+
+	/* host start message */
+	start_req = (struct hbm_host_version_request *)dev->wr_msg.data;
+	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->hbm_state = MEI_HBM_IDLE;
+	if (mei_write_message(dev, mei_hdr, dev->wr_msg.data)) {
+		dev_err(&dev->pdev->dev, "version message writet failed\n");
+		dev->dev_state = MEI_DEV_RESETTING;
+		mei_reset(dev, 1);
+		return -ENODEV;
+	}
+	dev->hbm_state = MEI_HBM_START;
+	dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
+	return 0;
+}
+
+/*
+ * mei_hbm_enum_clients_req - sends enumeration client request message.
+ *
+ * @dev: the device structure
+ *
+ * returns none.
+ */
+static void mei_hbm_enum_clients_req(struct mei_device *dev)
+{
+	struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
+	struct hbm_host_enum_request *enum_req;
+	const size_t len = sizeof(struct hbm_host_enum_request);
+	/* enumerate clients */
+	mei_hbm_hdr(mei_hdr, len);
+
+	enum_req = (struct hbm_host_enum_request *)dev->wr_msg.data;
+	memset(enum_req, 0, len);
+	enum_req->hbm_cmd = HOST_ENUM_REQ_CMD;
+
+	if (mei_write_message(dev, mei_hdr, dev->wr_msg.data)) {
+		dev->dev_state = MEI_DEV_RESETTING;
+		dev_err(&dev->pdev->dev, "enumeration request write failed.\n");
+		mei_reset(dev, 1);
+	}
+	dev->hbm_state = MEI_HBM_ENUM_CLIENTS;
+	dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
+	return;
+}
+
+/**
+ * mei_hbm_prop_req - request property for a single client
+ *
+ * @dev: the device structure
+ *
+ * returns none.
+ */
+
+static int mei_hbm_prop_req(struct mei_device *dev)
+{
+
+	struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
+	struct hbm_props_request *prop_req;
+	const size_t len = sizeof(struct hbm_props_request);
+	unsigned long next_client_index;
+	unsigned long 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) {
+		dev->hbm_state = MEI_HBM_STARTED;
+		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_hbm_hdr(mei_hdr, len);
+	prop_req = (struct hbm_props_request *)dev->wr_msg.data;
+
+	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, dev->wr_msg.data)) {
+		dev->dev_state = MEI_DEV_RESETTING;
+		dev_err(&dev->pdev->dev, "properties request write 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_hbm_stop_req_prepare - perpare stop request message
+ *
+ * @dev - mei device
+ * @mei_hdr - mei message header
+ * @data - hbm message body buffer
+ */
+static void mei_hbm_stop_req_prepare(struct mei_device *dev,
+		struct mei_msg_hdr *mei_hdr, unsigned char *data)
+{
+	struct hbm_host_stop_request *req =
+			(struct hbm_host_stop_request *)data;
+	const size_t len = sizeof(struct hbm_host_stop_request);
+
+	mei_hbm_hdr(mei_hdr, len);
+
+	memset(req, 0, len);
+	req->hbm_cmd = HOST_STOP_REQ_CMD;
+	req->reason = DRIVER_STOP_REQUEST;
+}
+
+/**
+ * mei_hbm_cl_flow_control_req - sends flow control requst.
+ *
+ * @dev: the device structure
+ * @cl: client info
+ *
+ * This function returns -EIO on write failure
+ */
+int mei_hbm_cl_flow_control_req(struct mei_device *dev, struct mei_cl *cl)
+{
+	struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
+	const size_t len = sizeof(struct hbm_flow_control);
+
+	mei_hbm_hdr(mei_hdr, len);
+	mei_hbm_cl_hdr(cl, MEI_FLOW_CONTROL_CMD, dev->wr_msg.data, len);
+
+	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, dev->wr_msg.data);
+}
+
+/**
+ * mei_hbm_add_single_flow_creds - adds single buffer credentials.
+ *
+ * @dev: the device structure
+ * @flow: flow control.
+ */
+static void mei_hbm_add_single_flow_creds(struct mei_device *dev,
+				  struct hbm_flow_control *flow)
+{
+	struct mei_me_client *client;
+	int i;
+
+	for (i = 0; i < dev->me_clients_num; i++) {
+		client = &dev->me_clients[i];
+		if (client && flow->me_addr == client->client_id) {
+			if (client->props.single_recv_buf) {
+				client->mei_flow_ctrl_creds++;
+				dev_dbg(&dev->pdev->dev, "recv flow ctrl msg ME %d (single).\n",
+				    flow->me_addr);
+				dev_dbg(&dev->pdev->dev, "flow control credentials =%d.\n",
+				    client->mei_flow_ctrl_creds);
+			} else {
+				BUG();	/* error in flow control */
+			}
+		}
+	}
+}
+
+/**
+ * mei_hbm_cl_flow_control_res - flow control response from me
+ *
+ * @dev: the device structure
+ * @flow_control: flow control response bus message
+ */
+static void mei_hbm_cl_flow_control_res(struct mei_device *dev,
+		struct hbm_flow_control *flow_control)
+{
+	struct mei_cl *cl = NULL;
+	struct mei_cl *next = NULL;
+
+	if (!flow_control->host_addr) {
+		/* single receive buffer */
+		mei_hbm_add_single_flow_creds(dev, flow_control);
+		return;
+	}
+
+	/* normal connection */
+	list_for_each_entry_safe(cl, next, &dev->file_list, link) {
+		if (mei_hbm_cl_addr_equal(cl, flow_control)) {
+			cl->mei_flow_ctrl_creds++;
+			dev_dbg(&dev->pdev->dev, "flow ctrl msg for host %d ME %d.\n",
+				flow_control->host_addr, flow_control->me_addr);
+			dev_dbg(&dev->pdev->dev, "flow control credentials = %d.\n",
+				    cl->mei_flow_ctrl_creds);
+				break;
+		}
+	}
+}
+
+
+/**
+ * mei_hbm_cl_disconnect_req - sends disconnect message to fw.
+ *
+ * @dev: the device structure
+ * @cl: a client to disconnect from
+ *
+ * This function returns -EIO on write failure
+ */
+int mei_hbm_cl_disconnect_req(struct mei_device *dev, struct mei_cl *cl)
+{
+	struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
+	const size_t len = sizeof(struct hbm_client_connect_request);
+
+	mei_hbm_hdr(mei_hdr, len);
+	mei_hbm_cl_hdr(cl, CLIENT_DISCONNECT_REQ_CMD, dev->wr_msg.data, len);
+
+	return mei_write_message(dev, mei_hdr, dev->wr_msg.data);
+}
+
+/**
+ * mei_hbm_cl_disconnect_res - disconnect response from ME
+ *
+ * @dev: the device structure
+ * @rs: disconnect response bus message
+ */
+static void mei_hbm_cl_disconnect_res(struct mei_device *dev,
+		struct hbm_client_connect_response *rs)
+{
+	struct mei_cl *cl;
+	struct mei_cl_cb *pos = NULL, *next = NULL;
+
+	dev_dbg(&dev->pdev->dev,
+			"disconnect_response:\n"
+			"ME Client = %d\n"
+			"Host Client = %d\n"
+			"Status = %d\n",
+			rs->me_addr,
+			rs->host_addr,
+			rs->status);
+
+	list_for_each_entry_safe(pos, next, &dev->ctrl_rd_list.list, list) {
+		cl = pos->cl;
+
+		if (!cl) {
+			list_del(&pos->list);
+			return;
+		}
+
+		dev_dbg(&dev->pdev->dev, "list_for_each_entry_safe in ctrl_rd_list.\n");
+		if (mei_hbm_cl_addr_equal(cl, rs)) {
+			list_del(&pos->list);
+			if (!rs->status)
+				cl->state = MEI_FILE_DISCONNECTED;
+
+			cl->status = 0;
+			cl->timer_count = 0;
+			break;
+		}
+	}
+}
+
+/**
+ * mei_hbm_cl_connect_req - send connection request to specific me client
+ *
+ * @dev: the device structure
+ * @cl: a client to connect to
+ *
+ * returns -EIO on write failure
+ */
+int mei_hbm_cl_connect_req(struct mei_device *dev, struct mei_cl *cl)
+{
+	struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
+	const size_t len = sizeof(struct hbm_client_connect_request);
+
+	mei_hbm_hdr(mei_hdr, len);
+	mei_hbm_cl_hdr(cl, CLIENT_CONNECT_REQ_CMD, dev->wr_msg.data, len);
+
+	return mei_write_message(dev, mei_hdr,  dev->wr_msg.data);
+}
+
+/**
+ * mei_hbm_cl_connect_res - connect resposne from the ME
+ *
+ * @dev: the device structure
+ * @rs: connect response bus message
+ */
+static void mei_hbm_cl_connect_res(struct mei_device *dev,
+		struct hbm_client_connect_response *rs)
+{
+
+	struct mei_cl *cl;
+	struct mei_cl_cb *pos = NULL, *next = NULL;
+
+	dev_dbg(&dev->pdev->dev,
+			"connect_response:\n"
+			"ME Client = %d\n"
+			"Host Client = %d\n"
+			"Status = %d\n",
+			rs->me_addr,
+			rs->host_addr,
+			rs->status);
+
+	/* if WD or iamthif client treat specially */
+
+	if (is_treat_specially_client(&dev->wd_cl, rs)) {
+		dev_dbg(&dev->pdev->dev, "successfully connected to WD client.\n");
+		mei_watchdog_register(dev);
+
+		return;
+	}
+
+	if (is_treat_specially_client(&dev->iamthif_cl, rs)) {
+		dev->iamthif_state = MEI_IAMTHIF_IDLE;
+		return;
+	}
+	list_for_each_entry_safe(pos, next, &dev->ctrl_rd_list.list, list) {
+
+		cl = pos->cl;
+		if (!cl) {
+			list_del(&pos->list);
+			return;
+		}
+		if (pos->fop_type == MEI_FOP_IOCTL) {
+			if (is_treat_specially_client(cl, rs)) {
+				list_del(&pos->list);
+				cl->status = 0;
+				cl->timer_count = 0;
+				break;
+			}
+		}
+	}
+}
+
+
+/**
+ * mei_hbm_fw_disconnect_req - disconnect request initiated by me
+ *  host sends disoconnect response
+ *
+ * @dev: the device structure.
+ * @disconnect_req: disconnect request bus message from the me
+ */
+static void mei_hbm_fw_disconnect_req(struct mei_device *dev,
+		struct hbm_client_connect_request *disconnect_req)
+{
+	struct mei_cl *cl, *next;
+	const size_t len = sizeof(struct hbm_client_connect_response);
+
+	list_for_each_entry_safe(cl, next, &dev->file_list, link) {
+		if (mei_hbm_cl_addr_equal(cl, disconnect_req)) {
+			dev_dbg(&dev->pdev->dev, "disconnect request host client %d ME client %d.\n",
+					disconnect_req->host_addr,
+					disconnect_req->me_addr);
+			cl->state = MEI_FILE_DISCONNECTED;
+			cl->timer_count = 0;
+			if (cl == &dev->wd_cl)
+				dev->wd_pending = false;
+			else if (cl == &dev->iamthif_cl)
+				dev->iamthif_timer = 0;
+
+			/* prepare disconnect response */
+			mei_hbm_hdr(&dev->wr_ext_msg.hdr, len);
+			mei_hbm_cl_hdr(cl, CLIENT_DISCONNECT_RES_CMD,
+					 dev->wr_ext_msg.data, len);
+			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;
+
+	/* 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 = version_res->me_max_version;
+			dev_dbg(&dev->pdev->dev, "version mismatch.\n");
+
+			dev->hbm_state = MEI_HBM_STOP;
+			mei_hbm_stop_req_prepare(dev, &dev->wr_msg.hdr,
+						dev->wr_msg.data);
+			mei_write_message(dev, &dev->wr_msg.hdr,
+					dev->wr_msg.data);
+
+			return;
+		}
+
+		dev->version.major_version = HBM_MAJOR_VERSION;
+		dev->version.minor_version = HBM_MINOR_VERSION;
+		if (dev->dev_state == MEI_DEV_INIT_CLIENTS &&
+		    dev->hbm_state == MEI_HBM_START) {
+			dev->init_clients_timer = 0;
+			mei_hbm_enum_clients_req(dev);
+		} else {
+			dev_err(&dev->pdev->dev, "reset: wrong host start response\n");
+			mei_reset(dev, 1);
+			return;
+		}
+
+		wake_up_interruptible(&dev->wait_recvd_msg);
+		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_hbm_cl_connect_res(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_hbm_cl_disconnect_res(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_hbm_cl_flow_control_res(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_err(&dev->pdev->dev, "reset: properties response hbm wrong status.\n");
+			mei_reset(dev, 1);
+			return;
+		}
+
+		if (me_client->client_id != props_res->address) {
+			dev_err(&dev->pdev->dev, "reset: host properties response address mismatch\n");
+			mei_reset(dev, 1);
+			return;
+		}
+
+		if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
+		    dev->hbm_state != MEI_HBM_CLIENT_PROPERTIES) {
+			dev_err(&dev->pdev->dev, "reset: unexpected properties response\n");
+			mei_reset(dev, 1);
+
+			return;
+		}
+
+		me_client->props = props_res->client_properties;
+		dev->me_client_index++;
+		dev->me_client_presentation_num++;
+
+		/* request property for the next client */
+		mei_hbm_prop_req(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->hbm_state == MEI_HBM_ENUM_CLIENTS) {
+				dev->init_clients_timer = 0;
+				mei_hbm_me_cl_allocate(dev);
+				dev->hbm_state = MEI_HBM_CLIENT_PROPERTIES;
+
+				/* first property reqeust */
+				mei_hbm_prop_req(dev);
+		} else {
+			dev_err(&dev->pdev->dev, "reset: unexpected enumeration response hbm.\n");
+			mei_reset(dev, 1);
+			return;
+		}
+		break;
+
+	case HOST_STOP_RES_CMD:
+
+		if (dev->hbm_state != MEI_HBM_STOP)
+			dev_err(&dev->pdev->dev, "unexpected stop response hbm.\n");
+		dev->dev_state = MEI_DEV_DISABLED;
+		dev_info(&dev->pdev->dev, "reset: 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_hbm_fw_disconnect_req(dev, disconnect_req);
+		break;
+
+	case ME_STOP_REQ_CMD:
+
+		dev->hbm_state = MEI_HBM_STOP;
+		mei_hbm_stop_req_prepare(dev, &dev->wr_ext_msg.hdr,
+					dev->wr_ext_msg.data);
+		break;
+	default:
+		BUG();
+		break;
+
+	}
+}
+

drivers/misc/mei/hbm.h

@@ -0,0 +1,60 @@
+/*
+ *
+ * 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.
+ *
+ */
+
+#ifndef _MEI_HBM_H_
+#define _MEI_HBM_H_
+
+struct mei_device;
+struct mei_msg_hdr;
+struct mei_cl;
+
+/**
+ * enum mei_hbm_state - host bus message protocol state
+ *
+ * @MEI_HBM_IDLE : protocol not started
+ * @MEI_HBM_START : start request message was sent
+ * @MEI_HBM_ENUM_CLIENTS : enumeration request was sent
+ * @MEI_HBM_CLIENT_PROPERTIES : acquiring clients properties
+ */
+enum mei_hbm_state {
+	MEI_HBM_IDLE = 0,
+	MEI_HBM_START,
+	MEI_HBM_ENUM_CLIENTS,
+	MEI_HBM_CLIENT_PROPERTIES,
+	MEI_HBM_STARTED,
+	MEI_HBM_STOP,
+};
+
+void mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr);
+
+static inline void mei_hbm_hdr(struct mei_msg_hdr *hdr, size_t length)
+{
+	hdr->host_addr = 0;
+	hdr->me_addr = 0;
+	hdr->length = length;
+	hdr->msg_complete = 1;
+	hdr->reserved = 0;
+}
+
+int mei_hbm_start_req(struct mei_device *dev);
+int mei_hbm_start_wait(struct mei_device *dev);
+int mei_hbm_cl_flow_control_req(struct mei_device *dev, struct mei_cl *cl);
+int mei_hbm_cl_disconnect_req(struct mei_device *dev, struct mei_cl *cl);
+int mei_hbm_cl_connect_req(struct mei_device *dev, struct mei_cl *cl);
+
+
+#endif /* _MEI_HBM_H_ */
+

drivers/misc/mei/hw-me-regs.h

@@ -0,0 +1,167 @@
+/******************************************************************************
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Intel MEI Interface Header
+ *
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2003 - 2012 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
+ * USA
+ *
+ * The full GNU General Public License is included in this distribution
+ * in the file called LICENSE.GPL.
+ *
+ * Contact Information:
+ *	Intel Corporation.
+ *	linux-mei@linux.intel.com
+ *	http://www.intel.com
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2003 - 2012 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *  * Neither the name Intel Corporation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *****************************************************************************/
+#ifndef _MEI_HW_MEI_REGS_H_
+#define _MEI_HW_MEI_REGS_H_
+
+/*
+ * MEI device IDs
+ */
+#define MEI_DEV_ID_82946GZ    0x2974  /* 82946GZ/GL */
+#define MEI_DEV_ID_82G35      0x2984  /* 82G35 Express */
+#define MEI_DEV_ID_82Q965     0x2994  /* 82Q963/Q965 */
+#define MEI_DEV_ID_82G965     0x29A4  /* 82P965/G965 */
+
+#define MEI_DEV_ID_82GM965    0x2A04  /* Mobile PM965/GM965 */
+#define MEI_DEV_ID_82GME965   0x2A14  /* Mobile GME965/GLE960 */
+
+#define MEI_DEV_ID_ICH9_82Q35 0x29B4  /* 82Q35 Express */
+#define MEI_DEV_ID_ICH9_82G33 0x29C4  /* 82G33/G31/P35/P31 Express */
+#define MEI_DEV_ID_ICH9_82Q33 0x29D4  /* 82Q33 Express */
+#define MEI_DEV_ID_ICH9_82X38 0x29E4  /* 82X38/X48 Express */
+#define MEI_DEV_ID_ICH9_3200  0x29F4  /* 3200/3210 Server */
+
+#define MEI_DEV_ID_ICH9_6     0x28B4  /* Bearlake */
+#define MEI_DEV_ID_ICH9_7     0x28C4  /* Bearlake */
+#define MEI_DEV_ID_ICH9_8     0x28D4  /* Bearlake */
+#define MEI_DEV_ID_ICH9_9     0x28E4  /* Bearlake */
+#define MEI_DEV_ID_ICH9_10    0x28F4  /* Bearlake */
+
+#define MEI_DEV_ID_ICH9M_1    0x2A44  /* Cantiga */
+#define MEI_DEV_ID_ICH9M_2    0x2A54  /* Cantiga */
+#define MEI_DEV_ID_ICH9M_3    0x2A64  /* Cantiga */
+#define MEI_DEV_ID_ICH9M_4    0x2A74  /* Cantiga */
+
+#define MEI_DEV_ID_ICH10_1    0x2E04  /* Eaglelake */
+#define MEI_DEV_ID_ICH10_2    0x2E14  /* Eaglelake */
+#define MEI_DEV_ID_ICH10_3    0x2E24  /* Eaglelake */
+#define MEI_DEV_ID_ICH10_4    0x2E34  /* Eaglelake */
+
+#define MEI_DEV_ID_IBXPK_1    0x3B64  /* Calpella */
+#define MEI_DEV_ID_IBXPK_2    0x3B65  /* Calpella */
+
+#define MEI_DEV_ID_CPT_1      0x1C3A  /* Couger Point */
+#define MEI_DEV_ID_PBG_1      0x1D3A  /* C600/X79 Patsburg */
+
+#define MEI_DEV_ID_PPT_1      0x1E3A  /* Panther Point */
+#define MEI_DEV_ID_PPT_2      0x1CBA  /* Panther Point */
+#define MEI_DEV_ID_PPT_3      0x1DBA  /* Panther Point */
+
+#define MEI_DEV_ID_LPT        0x8C3A  /* Lynx Point */
+#define MEI_DEV_ID_LPT_LP     0x9C3A  /* Lynx Point LP */
+/*
+ * MEI HW Section
+ */
+
+/* MEI registers */
+/* H_CB_WW - Host Circular Buffer (CB) Write Window register */
+#define H_CB_WW    0
+/* H_CSR - Host Control Status register */
+#define H_CSR      4
+/* ME_CB_RW - ME Circular Buffer Read Window register (read only) */
+#define ME_CB_RW   8
+/* ME_CSR_HA - ME Control Status Host Access register (read only) */
+#define ME_CSR_HA  0xC
+
+
+/* register bits of H_CSR (Host Control Status register) */
+/* Host Circular Buffer Depth - maximum number of 32-bit entries in CB */
+#define H_CBD             0xFF000000
+/* Host Circular Buffer Write Pointer */
+#define H_CBWP            0x00FF0000
+/* Host Circular Buffer Read Pointer */
+#define H_CBRP            0x0000FF00
+/* Host Reset */
+#define H_RST             0x00000010
+/* Host Ready */
+#define H_RDY             0x00000008
+/* Host Interrupt Generate */
+#define H_IG              0x00000004
+/* Host Interrupt Status */
+#define H_IS              0x00000002
+/* Host Interrupt Enable */
+#define H_IE              0x00000001
+
+
+/* register bits of ME_CSR_HA (ME Control Status Host Access register) */
+/* ME CB (Circular Buffer) Depth HRA (Host Read Access) - host read only
+access to ME_CBD */
+#define ME_CBD_HRA        0xFF000000
+/* ME CB Write Pointer HRA - host read only access to ME_CBWP */
+#define ME_CBWP_HRA       0x00FF0000
+/* ME CB Read Pointer HRA - host read only access to ME_CBRP */
+#define ME_CBRP_HRA       0x0000FF00
+/* ME Reset HRA - host read only access to ME_RST */
+#define ME_RST_HRA        0x00000010
+/* ME Ready HRA - host read only access to ME_RDY */
+#define ME_RDY_HRA        0x00000008
+/* ME Interrupt Generate HRA - host read only access to ME_IG */
+#define ME_IG_HRA         0x00000004
+/* ME Interrupt Status HRA - host read only access to ME_IS */
+#define ME_IS_HRA         0x00000002
+/* ME Interrupt Enable HRA - host read only access to ME_IE */
+#define ME_IE_HRA         0x00000001
+
+#endif /* _MEI_HW_MEI_REGS_H_ */

drivers/misc/mei/hw-me.c

@@ -0,0 +1,583 @@
+/*
+ *
+ * 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/kthread.h>
+#include <linux/interrupt.h>
+
+#include "mei_dev.h"
+#include "hw-me.h"
+
+#include "hbm.h"
+
+
+/**
+ * mei_me_reg_read - Reads 32bit data from the mei device
+ *
+ * @dev: the device structure
+ * @offset: offset from which to read the data
+ *
+ * returns register value (u32)
+ */
+static inline u32 mei_me_reg_read(const struct mei_me_hw *hw,
+			       unsigned long offset)
+{
+	return ioread32(hw->mem_addr + offset);
+}
+
+
+/**
+ * mei_me_reg_write - Writes 32bit data to the mei device
+ *
+ * @dev: the device structure
+ * @offset: offset from which to write the data
+ * @value: register value to write (u32)
+ */
+static inline void mei_me_reg_write(const struct mei_me_hw *hw,
+				 unsigned long offset, u32 value)
+{
+	iowrite32(value, hw->mem_addr + offset);
+}
+
+/**
+ * mei_me_mecbrw_read - Reads 32bit data from ME circular buffer
+ *  read window register
+ *
+ * @dev: the device structure
+ *
+ * returns ME_CB_RW register value (u32)
+ */
+static u32 mei_me_mecbrw_read(const struct mei_device *dev)
+{
+	return mei_me_reg_read(to_me_hw(dev), ME_CB_RW);
+}
+/**
+ * mei_me_mecsr_read - Reads 32bit data from the ME CSR
+ *
+ * @dev: the device structure
+ *
+ * returns ME_CSR_HA register value (u32)
+ */
+static inline u32 mei_me_mecsr_read(const struct mei_me_hw *hw)
+{
+	return mei_me_reg_read(hw, ME_CSR_HA);
+}
+
+/**
+ * mei_hcsr_read - Reads 32bit data from the host CSR
+ *
+ * @dev: the device structure
+ *
+ * returns H_CSR register value (u32)
+ */
+static inline u32 mei_hcsr_read(const struct mei_me_hw *hw)
+{
+	return mei_me_reg_read(hw, H_CSR);
+}
+
+/**
+ * mei_hcsr_set - writes H_CSR register to the mei device,
+ * and ignores the H_IS bit for it is write-one-to-zero.
+ *
+ * @dev: the device structure
+ */
+static inline void mei_hcsr_set(struct mei_me_hw *hw, u32 hcsr)
+{
+	hcsr &= ~H_IS;
+	mei_me_reg_write(hw, H_CSR, hcsr);
+}
+
+
+/**
+ * mei_me_hw_config - configure hw dependent settings
+ *
+ * @dev: mei device
+ */
+static void mei_me_hw_config(struct mei_device *dev)
+{
+	u32 hcsr = mei_hcsr_read(to_me_hw(dev));
+	/* Doesn't change in runtime */
+	dev->hbuf_depth = (hcsr & H_CBD) >> 24;
+}
+/**
+ * mei_clear_interrupts - clear and stop interrupts
+ *
+ * @dev: the device structure
+ */
+static void mei_me_intr_clear(struct mei_device *dev)
+{
+	struct mei_me_hw *hw = to_me_hw(dev);
+	u32 hcsr = mei_hcsr_read(hw);
+	if ((hcsr & H_IS) == H_IS)
+		mei_me_reg_write(hw, H_CSR, hcsr);
+}
+/**
+ * mei_me_intr_enable - enables mei device interrupts
+ *
+ * @dev: the device structure
+ */
+static void mei_me_intr_enable(struct mei_device *dev)
+{
+	struct mei_me_hw *hw = to_me_hw(dev);
+	u32 hcsr = mei_hcsr_read(hw);
+	hcsr |= H_IE;
+	mei_hcsr_set(hw, hcsr);
+}
+
+/**
+ * mei_disable_interrupts - disables mei device interrupts
+ *
+ * @dev: the device structure
+ */
+static void mei_me_intr_disable(struct mei_device *dev)
+{
+	struct mei_me_hw *hw = to_me_hw(dev);
+	u32 hcsr = mei_hcsr_read(hw);
+	hcsr  &= ~H_IE;
+	mei_hcsr_set(hw, hcsr);
+}
+
+/**
+ * mei_me_hw_reset_release - release device from the reset
+ *
+ * @dev: the device structure
+ */
+static void mei_me_hw_reset_release(struct mei_device *dev)
+{
+	struct mei_me_hw *hw = to_me_hw(dev);
+	u32 hcsr = mei_hcsr_read(hw);
+
+	hcsr |= H_IG;
+	hcsr &= ~H_RST;
+	mei_hcsr_set(hw, hcsr);
+}
+/**
+ * mei_me_hw_reset - resets fw via mei csr register.
+ *
+ * @dev: the device structure
+ * @intr_enable: if interrupt should be enabled after reset.
+ */
+static void mei_me_hw_reset(struct mei_device *dev, bool intr_enable)
+{
+	struct mei_me_hw *hw = to_me_hw(dev);
+	u32 hcsr = mei_hcsr_read(hw);
+
+	hcsr |= H_RST | H_IG | H_IS;
+
+	if (intr_enable)
+		hcsr |= H_IE;
+	else
+		hcsr &= ~H_IE;
+
+	mei_me_reg_write(hw, H_CSR, hcsr);
+
+	if (dev->dev_state == MEI_DEV_POWER_DOWN)
+		mei_me_hw_reset_release(dev);
+
+	dev_dbg(&dev->pdev->dev, "current HCSR = 0x%08x.\n", mei_hcsr_read(hw));
+}
+
+/**
+ * mei_me_host_set_ready - enable device
+ *
+ * @dev - mei device
+ * returns bool
+ */
+
+static void mei_me_host_set_ready(struct mei_device *dev)
+{
+	struct mei_me_hw *hw = to_me_hw(dev);
+	hw->host_hw_state |= H_IE | H_IG | H_RDY;
+	mei_hcsr_set(hw, hw->host_hw_state);
+}
+/**
+ * mei_me_host_is_ready - check whether the host has turned ready
+ *
+ * @dev - mei device
+ * returns bool
+ */
+static bool mei_me_host_is_ready(struct mei_device *dev)
+{
+	struct mei_me_hw *hw = to_me_hw(dev);
+	hw->host_hw_state = mei_hcsr_read(hw);
+	return (hw->host_hw_state & H_RDY) == H_RDY;
+}
+
+/**
+ * mei_me_hw_is_ready - check whether the me(hw) has turned ready
+ *
+ * @dev - mei device
+ * returns bool
+ */
+static bool mei_me_hw_is_ready(struct mei_device *dev)
+{
+	struct mei_me_hw *hw = to_me_hw(dev);
+	hw->me_hw_state = mei_me_mecsr_read(hw);
+	return (hw->me_hw_state & ME_RDY_HRA) == ME_RDY_HRA;
+}
+
+static int mei_me_hw_ready_wait(struct mei_device *dev)
+{
+	int err;
+	if (mei_me_hw_is_ready(dev))
+		return 0;
+
+	dev->recvd_hw_ready = false;
+	mutex_unlock(&dev->device_lock);
+	err = wait_event_interruptible_timeout(dev->wait_hw_ready,
+			dev->recvd_hw_ready,
+			mei_secs_to_jiffies(MEI_INTEROP_TIMEOUT));
+	mutex_lock(&dev->device_lock);
+	if (!err && !dev->recvd_hw_ready) {
+		if (!err)
+			err = -ETIMEDOUT;
+		dev_err(&dev->pdev->dev,
+			"wait hw ready failed. status = %d\n", err);
+		return err;
+	}
+
+	dev->recvd_hw_ready = false;
+	return 0;
+}
+
+static int mei_me_hw_start(struct mei_device *dev)
+{
+	int ret = mei_me_hw_ready_wait(dev);
+	if (ret)
+		return ret;
+	dev_dbg(&dev->pdev->dev, "hw is ready\n");
+
+	mei_me_host_set_ready(dev);
+	return ret;
+}
+
+
+/**
+ * mei_hbuf_filled_slots - gets number of device filled buffer slots
+ *
+ * @dev: the device structure
+ *
+ * returns number of filled slots
+ */
+static unsigned char mei_hbuf_filled_slots(struct mei_device *dev)
+{
+	struct mei_me_hw *hw = to_me_hw(dev);
+	char read_ptr, write_ptr;
+
+	hw->host_hw_state = mei_hcsr_read(hw);
+
+	read_ptr = (char) ((hw->host_hw_state & H_CBRP) >> 8);
+	write_ptr = (char) ((hw->host_hw_state & H_CBWP) >> 16);
+
+	return (unsigned char) (write_ptr - read_ptr);
+}
+
+/**
+ * mei_me_hbuf_is_empty - checks if host buffer is empty.
+ *
+ * @dev: the device structure
+ *
+ * returns true if empty, false - otherwise.
+ */
+static bool mei_me_hbuf_is_empty(struct mei_device *dev)
+{
+	return mei_hbuf_filled_slots(dev) == 0;
+}
+
+/**
+ * mei_me_hbuf_empty_slots - counts write empty slots.
+ *
+ * @dev: the device structure
+ *
+ * returns -1(ESLOTS_OVERFLOW) if overflow, otherwise empty slots count
+ */
+static int mei_me_hbuf_empty_slots(struct mei_device *dev)
+{
+	unsigned char filled_slots, empty_slots;
+
+	filled_slots = mei_hbuf_filled_slots(dev);
+	empty_slots = dev->hbuf_depth - filled_slots;
+
+	/* check for overflow */
+	if (filled_slots > dev->hbuf_depth)
+		return -EOVERFLOW;
+
+	return empty_slots;
+}
+
+static size_t mei_me_hbuf_max_len(const struct mei_device *dev)
+{
+	return dev->hbuf_depth * sizeof(u32) - sizeof(struct mei_msg_hdr);
+}
+
+
+/**
+ * mei_write_message - writes a message to mei device.
+ *
+ * @dev: the device structure
+ * @header: mei HECI header of message
+ * @buf: message payload will be written
+ *
+ * This function returns -EIO if write has failed
+ */
+static int mei_me_write_message(struct mei_device *dev,
+			struct mei_msg_hdr *header,
+			unsigned char *buf)
+{
+	struct mei_me_hw *hw = to_me_hw(dev);
+	unsigned long rem;
+	unsigned long length = header->length;
+	u32 *reg_buf = (u32 *)buf;
+	u32 hcsr;
+	u32 dw_cnt;
+	int i;
+	int empty_slots;
+
+	dev_dbg(&dev->pdev->dev, MEI_HDR_FMT, MEI_HDR_PRM(header));
+
+	empty_slots = mei_hbuf_empty_slots(dev);
+	dev_dbg(&dev->pdev->dev, "empty slots = %hu.\n", empty_slots);
+
+	dw_cnt = mei_data2slots(length);
+	if (empty_slots < 0 || dw_cnt > empty_slots)
+		return -EIO;
+
+	mei_me_reg_write(hw, H_CB_WW, *((u32 *) header));
+
+	for (i = 0; i < length / 4; i++)
+		mei_me_reg_write(hw, H_CB_WW, reg_buf[i]);
+
+	rem = length & 0x3;
+	if (rem > 0) {
+		u32 reg = 0;
+		memcpy(&reg, &buf[length - rem], rem);
+		mei_me_reg_write(hw, H_CB_WW, reg);
+	}
+
+	hcsr = mei_hcsr_read(hw) | H_IG;
+	mei_hcsr_set(hw, hcsr);
+	if (!mei_me_hw_is_ready(dev))
+		return -EIO;
+
+	return 0;
+}
+
+/**
+ * mei_me_count_full_read_slots - counts read full slots.
+ *
+ * @dev: the device structure
+ *
+ * returns -1(ESLOTS_OVERFLOW) if overflow, otherwise filled slots count
+ */
+static int mei_me_count_full_read_slots(struct mei_device *dev)
+{
+	struct mei_me_hw *hw = to_me_hw(dev);
+	char read_ptr, write_ptr;
+	unsigned char buffer_depth, filled_slots;
+
+	hw->me_hw_state = mei_me_mecsr_read(hw);
+	buffer_depth = (unsigned char)((hw->me_hw_state & ME_CBD_HRA) >> 24);
+	read_ptr = (char) ((hw->me_hw_state & ME_CBRP_HRA) >> 8);
+	write_ptr = (char) ((hw->me_hw_state & ME_CBWP_HRA) >> 16);
+	filled_slots = (unsigned char) (write_ptr - read_ptr);
+
+	/* check for overflow */
+	if (filled_slots > buffer_depth)
+		return -EOVERFLOW;
+
+	dev_dbg(&dev->pdev->dev, "filled_slots =%08x\n", filled_slots);
+	return (int)filled_slots;
+}
+
+/**
+ * mei_me_read_slots - reads a message from mei device.
+ *
+ * @dev: the device structure
+ * @buffer: message buffer will be written
+ * @buffer_length: message size will be read
+ */
+static int mei_me_read_slots(struct mei_device *dev, unsigned char *buffer,
+		    unsigned long buffer_length)
+{
+	struct mei_me_hw *hw = to_me_hw(dev);
+	u32 *reg_buf = (u32 *)buffer;
+	u32 hcsr;
+
+	for (; buffer_length >= sizeof(u32); buffer_length -= sizeof(u32))
+		*reg_buf++ = mei_me_mecbrw_read(dev);
+
+	if (buffer_length > 0) {
+		u32 reg = mei_me_mecbrw_read(dev);
+		memcpy(reg_buf, &reg, buffer_length);
+	}
+
+	hcsr = mei_hcsr_read(hw) | H_IG;
+	mei_hcsr_set(hw, hcsr);
+	return 0;
+}
+
+/**
+ * mei_me_irq_quick_handler - The ISR of the MEI device
+ *
+ * @irq: The irq number
+ * @dev_id: pointer to the device structure
+ *
+ * returns irqreturn_t
+ */
+
+irqreturn_t mei_me_irq_quick_handler(int irq, void *dev_id)
+{
+	struct mei_device *dev = (struct mei_device *) dev_id;
+	struct mei_me_hw *hw = to_me_hw(dev);
+	u32 csr_reg = mei_hcsr_read(hw);
+
+	if ((csr_reg & H_IS) != H_IS)
+		return IRQ_NONE;
+
+	/* clear H_IS bit in H_CSR */
+	mei_me_reg_write(hw, H_CSR, csr_reg);
+
+	return IRQ_WAKE_THREAD;
+}
+
+/**
+ * mei_me_irq_thread_handler - function called after ISR to handle the interrupt
+ * processing.
+ *
+ * @irq: The irq number
+ * @dev_id: pointer to the device structure
+ *
+ * returns irqreturn_t
+ *
+ */
+irqreturn_t mei_me_irq_thread_handler(int irq, void *dev_id)
+{
+	struct mei_device *dev = (struct mei_device *) dev_id;
+	struct mei_cl_cb complete_list;
+	s32 slots;
+	int rets;
+
+	dev_dbg(&dev->pdev->dev, "function called after ISR to handle the interrupt processing.\n");
+	/* initialize our complete list */
+	mutex_lock(&dev->device_lock);
+	mei_io_list_init(&complete_list);
+
+	/* Ack the interrupt here
+	 * In case of MSI we don't go through the quick handler */
+	if (pci_dev_msi_enabled(dev->pdev))
+		mei_clear_interrupts(dev);
+
+	/* check if ME wants a reset */
+	if (!mei_hw_is_ready(dev) &&
+	    dev->dev_state != MEI_DEV_RESETTING &&
+	    dev->dev_state != MEI_DEV_INITIALIZING &&
+	    dev->dev_state != MEI_DEV_POWER_DOWN &&
+	    dev->dev_state != MEI_DEV_POWER_UP) {
+		dev_dbg(&dev->pdev->dev, "FW not ready.\n");
+		mei_reset(dev, 1);
+		mutex_unlock(&dev->device_lock);
+		return IRQ_HANDLED;
+	}
+
+	/*  check if we need to start the dev */
+	if (!mei_host_is_ready(dev)) {
+		if (mei_hw_is_ready(dev)) {
+			dev_dbg(&dev->pdev->dev, "we need to start the dev.\n");
+
+			dev->recvd_hw_ready = true;
+			wake_up_interruptible(&dev->wait_hw_ready);
+
+			mutex_unlock(&dev->device_lock);
+			return IRQ_HANDLED;
+		} else {
+			dev_dbg(&dev->pdev->dev, "Reset Completed.\n");
+			mei_me_hw_reset_release(dev);
+			mutex_unlock(&dev->device_lock);
+			return IRQ_HANDLED;
+		}
+	}
+	/* check slots available for reading */
+	slots = mei_count_full_read_slots(dev);
+	while (slots > 0) {
+		/* we have urgent data to send so break the read */
+		if (dev->wr_ext_msg.hdr.length)
+			break;
+		dev_dbg(&dev->pdev->dev, "slots =%08x\n", slots);
+		dev_dbg(&dev->pdev->dev, "call mei_irq_read_handler.\n");
+		rets = mei_irq_read_handler(dev, &complete_list, &slots);
+		if (rets)
+			goto end;
+	}
+	rets = mei_irq_write_handler(dev, &complete_list);
+end:
+	dev_dbg(&dev->pdev->dev, "end of bottom half function.\n");
+	dev->hbuf_is_ready = mei_hbuf_is_ready(dev);
+
+	mutex_unlock(&dev->device_lock);
+
+	mei_irq_compl_handler(dev, &complete_list);
+
+	return IRQ_HANDLED;
+}
+static const struct mei_hw_ops mei_me_hw_ops = {
+
+	.host_is_ready = mei_me_host_is_ready,
+
+	.hw_is_ready = mei_me_hw_is_ready,
+	.hw_reset = mei_me_hw_reset,
+	.hw_config = mei_me_hw_config,
+	.hw_start = mei_me_hw_start,
+
+	.intr_clear = mei_me_intr_clear,
+	.intr_enable = mei_me_intr_enable,
+	.intr_disable = mei_me_intr_disable,
+
+	.hbuf_free_slots = mei_me_hbuf_empty_slots,
+	.hbuf_is_ready = mei_me_hbuf_is_empty,
+	.hbuf_max_len = mei_me_hbuf_max_len,
+
+	.write = mei_me_write_message,
+
+	.rdbuf_full_slots = mei_me_count_full_read_slots,
+	.read_hdr = mei_me_mecbrw_read,
+	.read = mei_me_read_slots
+};
+
+/**
+ * mei_me_dev_init - allocates and initializes the mei device structure
+ *
+ * @pdev: The pci device structure
+ *
+ * returns The mei_device_device pointer on success, NULL on failure.
+ */
+struct mei_device *mei_me_dev_init(struct pci_dev *pdev)
+{
+	struct mei_device *dev;
+
+	dev = kzalloc(sizeof(struct mei_device) +
+			 sizeof(struct mei_me_hw), GFP_KERNEL);
+	if (!dev)
+		return NULL;
+
+	mei_device_init(dev);
+
+	dev->ops = &mei_me_hw_ops;
+
+	dev->pdev = pdev;
+	return dev;
+}
+

drivers/misc/mei/hw-me.h

@@ -0,0 +1,42 @@
+/*
+ *
+ * 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.
+ *
+ */
+
+
+
+#ifndef _MEI_INTERFACE_H_
+#define _MEI_INTERFACE_H_
+
+#include <linux/mei.h>
+#include "mei_dev.h"
+#include "client.h"
+
+struct mei_me_hw {
+	void __iomem *mem_addr;
+	/*
+	 * hw states of host and fw(ME)
+	 */
+	u32 host_hw_state;
+	u32 me_hw_state;
+};
+
+#define to_me_hw(dev) (struct mei_me_hw *)((dev)->hw)
+
+struct mei_device *mei_me_dev_init(struct pci_dev *pdev);
+
+irqreturn_t mei_me_irq_quick_handler(int irq, void *dev_id);
+irqreturn_t mei_me_irq_thread_handler(int irq, void *dev_id);
+
+#endif /* _MEI_INTERFACE_H_ */

drivers/misc/mei/hw.h

@@ -0,0 +1,250 @@
+/*
+ *
+ * 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.
+ *
+ */
+
+#ifndef _MEI_HW_TYPES_H_
+#define _MEI_HW_TYPES_H_
+
+#include <linux/uuid.h>
+
+/*
+ * Timeouts in Seconds
+ */
+#define MEI_INTEROP_TIMEOUT         7  /* Timeout on ready message */
+#define MEI_CONNECT_TIMEOUT         3  /* HPS: at least 2 seconds */
+
+#define MEI_CL_CONNECT_TIMEOUT     15  /* HPS: Client Connect Timeout */
+#define MEI_CLIENTS_INIT_TIMEOUT   15  /* HPS: Clients Enumeration Timeout */
+
+#define MEI_IAMTHIF_STALL_TIMER    12  /* HPS */
+#define MEI_IAMTHIF_READ_TIMER     10  /* HPS */
+
+
+/*
+ * MEI Version
+ */
+#define HBM_MINOR_VERSION                   0
+#define HBM_MAJOR_VERSION                   1
+#define HBM_TIMEOUT                         1	/* 1 second */
+
+/* Host bus message command opcode */
+#define MEI_HBM_CMD_OP_MSK                  0x7f
+/* Host bus message command RESPONSE */
+#define MEI_HBM_CMD_RES_MSK                 0x80
+
+/*
+ * MEI Bus Message Command IDs
+ */
+#define HOST_START_REQ_CMD                  0x01
+#define HOST_START_RES_CMD                  0x81
+
+#define HOST_STOP_REQ_CMD                   0x02
+#define HOST_STOP_RES_CMD                   0x82
+
+#define ME_STOP_REQ_CMD                     0x03
+
+#define HOST_ENUM_REQ_CMD                   0x04
+#define HOST_ENUM_RES_CMD                   0x84
+
+#define HOST_CLIENT_PROPERTIES_REQ_CMD      0x05
+#define HOST_CLIENT_PROPERTIES_RES_CMD      0x85
+
+#define CLIENT_CONNECT_REQ_CMD              0x06
+#define CLIENT_CONNECT_RES_CMD              0x86
+
+#define CLIENT_DISCONNECT_REQ_CMD           0x07
+#define CLIENT_DISCONNECT_RES_CMD           0x87
+
+#define MEI_FLOW_CONTROL_CMD                0x08
+
+/*
+ * MEI Stop Reason
+ * used by hbm_host_stop_request.reason
+ */
+enum mei_stop_reason_types {
+	DRIVER_STOP_REQUEST = 0x00,
+	DEVICE_D1_ENTRY = 0x01,
+	DEVICE_D2_ENTRY = 0x02,
+	DEVICE_D3_ENTRY = 0x03,
+	SYSTEM_S1_ENTRY = 0x04,
+	SYSTEM_S2_ENTRY = 0x05,
+	SYSTEM_S3_ENTRY = 0x06,
+	SYSTEM_S4_ENTRY = 0x07,
+	SYSTEM_S5_ENTRY = 0x08
+};
+
+/*
+ * Client Connect Status
+ * used by hbm_client_connect_response.status
+ */
+enum client_connect_status_types {
+	CCS_SUCCESS = 0x00,
+	CCS_NOT_FOUND = 0x01,
+	CCS_ALREADY_STARTED = 0x02,
+	CCS_OUT_OF_RESOURCES = 0x03,
+	CCS_MESSAGE_SMALL = 0x04
+};
+
+/*
+ * Client Disconnect Status
+ */
+enum client_disconnect_status_types {
+	CDS_SUCCESS = 0x00
+};
+
+/*
+ *  MEI BUS Interface Section
+ */
+struct mei_msg_hdr {
+	u32 me_addr:8;
+	u32 host_addr:8;
+	u32 length:9;
+	u32 reserved:6;
+	u32 msg_complete:1;
+} __packed;
+
+
+struct mei_bus_message {
+	u8 hbm_cmd;
+	u8 data[0];
+} __packed;
+
+/**
+ * struct hbm_cl_cmd - client specific host bus command
+ *	CONNECT, DISCONNECT, and FlOW CONTROL
+ *
+ * @hbm_cmd - bus message command header
+ * @me_addr - address of the client in ME
+ * @host_addr - address of the client in the driver
+ * @data
+ */
+struct mei_hbm_cl_cmd {
+	u8 hbm_cmd;
+	u8 me_addr;
+	u8 host_addr;
+	u8 data;
+};
+
+struct hbm_version {
+	u8 minor_version;
+	u8 major_version;
+} __packed;
+
+struct hbm_host_version_request {
+	u8 hbm_cmd;
+	u8 reserved;
+	struct hbm_version host_version;
+} __packed;
+
+struct hbm_host_version_response {
+	u8 hbm_cmd;
+	u8 host_version_supported;
+	struct hbm_version me_max_version;
+} __packed;
+
+struct hbm_host_stop_request {
+	u8 hbm_cmd;
+	u8 reason;
+	u8 reserved[2];
+} __packed;
+
+struct hbm_host_stop_response {
+	u8 hbm_cmd;
+	u8 reserved[3];
+} __packed;
+
+struct hbm_me_stop_request {
+	u8 hbm_cmd;
+	u8 reason;
+	u8 reserved[2];
+} __packed;
+
+struct hbm_host_enum_request {
+	u8 hbm_cmd;
+	u8 reserved[3];
+} __packed;
+
+struct hbm_host_enum_response {
+	u8 hbm_cmd;
+	u8 reserved[3];
+	u8 valid_addresses[32];
+} __packed;
+
+struct mei_client_properties {
+	uuid_le protocol_name;
+	u8 protocol_version;
+	u8 max_number_of_connections;
+	u8 fixed_address;
+	u8 single_recv_buf;
+	u32 max_msg_length;
+} __packed;
+
+struct hbm_props_request {
+	u8 hbm_cmd;
+	u8 address;
+	u8 reserved[2];
+} __packed;
+
+
+struct hbm_props_response {
+	u8 hbm_cmd;
+	u8 address;
+	u8 status;
+	u8 reserved[1];
+	struct mei_client_properties client_properties;
+} __packed;
+
+/**
+ * struct hbm_client_connect_request - connect/disconnect request
+ *
+ * @hbm_cmd - bus message command header
+ * @me_addr - address of the client in ME
+ * @host_addr - address of the client in the driver
+ * @reserved
+ */
+struct hbm_client_connect_request {
+	u8 hbm_cmd;
+	u8 me_addr;
+	u8 host_addr;
+	u8 reserved;
+} __packed;
+
+/**
+ * struct hbm_client_connect_response - connect/disconnect response
+ *
+ * @hbm_cmd - bus message command header
+ * @me_addr - address of the client in ME
+ * @host_addr - address of the client in the driver
+ * @status - status of the request
+ */
+struct hbm_client_connect_response {
+	u8 hbm_cmd;
+	u8 me_addr;
+	u8 host_addr;
+	u8 status;
+} __packed;
+
+
+#define MEI_FC_MESSAGE_RESERVED_LENGTH           5
+
+struct hbm_flow_control {
+	u8 hbm_cmd;
+	u8 me_addr;
+	u8 host_addr;
+	u8 reserved[MEI_FC_MESSAGE_RESERVED_LENGTH];
+} __packed;
+
+
+#endif

drivers/misc/mei/init.c

@@ -0,0 +1,224 @@
+/*
+ *
+ * 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/export.h>
+#include <linux/pci.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/delay.h>
+
+#include <linux/mei.h>
+
+#include "mei_dev.h"
+#include "hbm.h"
+#include "client.h"
+
+const char *mei_dev_state_str(int state)
+{
+#define MEI_DEV_STATE(state) case MEI_DEV_##state: return #state
+	switch (state) {
+	MEI_DEV_STATE(INITIALIZING);
+	MEI_DEV_STATE(INIT_CLIENTS);
+	MEI_DEV_STATE(ENABLED);
+	MEI_DEV_STATE(RESETTING);
+	MEI_DEV_STATE(DISABLED);
+	MEI_DEV_STATE(POWER_DOWN);
+	MEI_DEV_STATE(POWER_UP);
+	default:
+		return "unkown";
+	}
+#undef MEI_DEV_STATE
+}
+
+void mei_device_init(struct mei_device *dev)
+{
+	/* setup our list array */
+	INIT_LIST_HEAD(&dev->file_list);
+	INIT_LIST_HEAD(&dev->device_list);
+	mutex_init(&dev->device_lock);
+	init_waitqueue_head(&dev->wait_hw_ready);
+	init_waitqueue_head(&dev->wait_recvd_msg);
+	init_waitqueue_head(&dev->wait_stop_wd);
+	dev->dev_state = MEI_DEV_INITIALIZING;
+
+	mei_io_list_init(&dev->read_list);
+	mei_io_list_init(&dev->write_list);
+	mei_io_list_init(&dev->write_waiting_list);
+	mei_io_list_init(&dev->ctrl_wr_list);
+	mei_io_list_init(&dev->ctrl_rd_list);
+
+	INIT_DELAYED_WORK(&dev->timer_work, mei_timer);
+	INIT_WORK(&dev->init_work, mei_host_client_init);
+
+	INIT_LIST_HEAD(&dev->wd_cl.link);
+	INIT_LIST_HEAD(&dev->iamthif_cl.link);
+	mei_io_list_init(&dev->amthif_cmd_list);
+	mei_io_list_init(&dev->amthif_rd_complete_list);
+
+}
+EXPORT_SYMBOL_GPL(mei_device_init);
+
+/**
+ * mei_start - initializes host and fw to start work.
+ *
+ * @dev: the device structure
+ *
+ * returns 0 on success, <0 on failure.
+ */
+int mei_start(struct mei_device *dev)
+{
+	mutex_lock(&dev->device_lock);
+
+	/* acknowledge interrupt and stop interupts */
+	mei_clear_interrupts(dev);
+
+	mei_hw_config(dev);
+
+	dev_dbg(&dev->pdev->dev, "reset in start the mei device.\n");
+
+	mei_reset(dev, 1);
+
+	if (mei_hbm_start_wait(dev)) {
+		dev_err(&dev->pdev->dev, "HBM haven't started");
+		goto err;
+	}
+
+	if (!mei_host_is_ready(dev)) {
+		dev_err(&dev->pdev->dev, "host is not ready.\n");
+		goto err;
+	}
+
+	if (!mei_hw_is_ready(dev)) {
+		dev_err(&dev->pdev->dev, "ME is not ready.\n");
+		goto err;
+	}
+
+	if (dev->version.major_version != HBM_MAJOR_VERSION ||
+	    dev->version.minor_version != HBM_MINOR_VERSION) {
+		dev_dbg(&dev->pdev->dev, "MEI start failed.\n");
+		goto err;
+	}
+
+	dev_dbg(&dev->pdev->dev, "link layer has been established.\n");
+
+	mutex_unlock(&dev->device_lock);
+	return 0;
+err:
+	dev_err(&dev->pdev->dev, "link layer initialization failed.\n");
+	dev->dev_state = MEI_DEV_DISABLED;
+	mutex_unlock(&dev->device_lock);
+	return -ENODEV;
+}
+EXPORT_SYMBOL_GPL(mei_start);
+
+/**
+ * mei_reset - resets host and fw.
+ *
+ * @dev: the device structure
+ * @interrupts_enabled: if interrupt should be enabled after reset.
+ */
+void mei_reset(struct mei_device *dev, int interrupts_enabled)
+{
+	bool unexpected;
+
+	unexpected = (dev->dev_state != MEI_DEV_INITIALIZING &&
+			dev->dev_state != MEI_DEV_DISABLED &&
+			dev->dev_state != MEI_DEV_POWER_DOWN &&
+			dev->dev_state != MEI_DEV_POWER_UP);
+
+	mei_hw_reset(dev, interrupts_enabled);
+
+	dev->hbm_state = MEI_HBM_IDLE;
+
+	if (dev->dev_state != MEI_DEV_INITIALIZING &&
+	    dev->dev_state != MEI_DEV_POWER_UP) {
+		if (dev->dev_state != MEI_DEV_DISABLED &&
+		    dev->dev_state != MEI_DEV_POWER_DOWN)
+			dev->dev_state = MEI_DEV_RESETTING;
+
+		mei_cl_all_disconnect(dev);
+
+		/* remove entry if already in list */
+		dev_dbg(&dev->pdev->dev, "remove iamthif and wd from the file list.\n");
+		mei_cl_unlink(&dev->wd_cl);
+		if (dev->open_handle_count > 0)
+			dev->open_handle_count--;
+		mei_cl_unlink(&dev->iamthif_cl);
+		if (dev->open_handle_count > 0)
+			dev->open_handle_count--;
+
+		mei_amthif_reset_params(dev);
+		memset(&dev->wr_ext_msg, 0, sizeof(dev->wr_ext_msg));
+	}
+
+	/* we're already in reset, cancel the init timer */
+	dev->init_clients_timer = 0;
+
+	dev->me_clients_num = 0;
+	dev->rd_msg_hdr = 0;
+	dev->wd_pending = false;
+
+	if (unexpected)
+		dev_warn(&dev->pdev->dev, "unexpected reset: dev_state = %s\n",
+			 mei_dev_state_str(dev->dev_state));
+
+	if (!interrupts_enabled) {
+		dev_dbg(&dev->pdev->dev, "intr not enabled end of reset\n");
+		return;
+	}
+
+	mei_hw_start(dev);
+
+	dev_dbg(&dev->pdev->dev, "link is established start sending messages.\n");
+	/* link is established * start sending messages.  */
+
+	dev->dev_state = MEI_DEV_INIT_CLIENTS;
+
+	mei_hbm_start_req(dev);
+
+	/* wake up all readings so they can be interrupted */
+	mei_cl_all_read_wakeup(dev);
+
+	/* remove all waiting requests */
+	mei_cl_all_write_clear(dev);
+}
+EXPORT_SYMBOL_GPL(mei_reset);
+
+void mei_stop(struct mei_device *dev)
+{
+	dev_dbg(&dev->pdev->dev, "stopping the device.\n");
+
+	flush_scheduled_work();
+
+	mutex_lock(&dev->device_lock);
+
+	cancel_delayed_work(&dev->timer_work);
+
+	mei_wd_stop(dev);
+
+	mei_nfc_host_exit();
+
+	dev->dev_state = MEI_DEV_POWER_DOWN;
+	mei_reset(dev, 0);
+
+	mutex_unlock(&dev->device_lock);
+
+	mei_watchdog_unregister(dev);
+}
+EXPORT_SYMBOL_GPL(mei_stop);
+
+
+

drivers/misc/mei/interrupt.c

@@ -0,0 +1,725 @@
+/*
+ *
+ * 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/export.h>
+#include <linux/pci.h>
+#include <linux/kthread.h>
+#include <linux/interrupt.h>
+#include <linux/fs.h>
+#include <linux/jiffies.h>
+
+#include <linux/mei.h>
+
+#include "mei_dev.h"
+#include "hbm.h"
+#include "hw-me.h"
+#include "client.h"
+
+
+/**
+ * mei_cl_complete_handler - processes completed operation for a client
+ *
+ * @cl: private data of the file object.
+ * @cb: callback block.
+ */
+static void mei_cl_complete_handler(struct mei_cl *cl, struct mei_cl_cb *cb)
+{
+	if (cb->fop_type == MEI_FOP_WRITE) {
+		mei_io_cb_free(cb);
+		cb = NULL;
+		cl->writing_state = MEI_WRITE_COMPLETE;
+		if (waitqueue_active(&cl->tx_wait))
+			wake_up_interruptible(&cl->tx_wait);
+
+	} else if (cb->fop_type == MEI_FOP_READ &&
+			MEI_READING == cl->reading_state) {
+		cl->reading_state = MEI_READ_COMPLETE;
+		if (waitqueue_active(&cl->rx_wait))
+			wake_up_interruptible(&cl->rx_wait);
+		else
+			mei_cl_bus_rx_event(cl);
+
+	}
+}
+
+/**
+ * mei_irq_compl_handler - dispatch complete handelers
+ *	for the completed callbacks
+ *
+ * @dev - mei device
+ * @compl_list - list of completed cbs
+ */
+void mei_irq_compl_handler(struct mei_device *dev, struct mei_cl_cb *compl_list)
+{
+	struct mei_cl_cb *cb, *next;
+	struct mei_cl *cl;
+
+	list_for_each_entry_safe(cb, next, &compl_list->list, list) {
+		cl = cb->cl;
+		list_del(&cb->list);
+		if (!cl)
+			continue;
+
+		dev_dbg(&dev->pdev->dev, "completing call back.\n");
+		if (cl == &dev->iamthif_cl)
+			mei_amthif_complete(dev, cb);
+		else
+			mei_cl_complete_handler(cl, cb);
+	}
+}
+EXPORT_SYMBOL_GPL(mei_irq_compl_handler);
+
+/**
+ * mei_cl_hbm_equal - check if hbm is addressed to the client
+ *
+ * @cl: host client
+ * @mei_hdr: header of mei client message
+ *
+ * returns true if matches, false otherwise
+ */
+static inline int mei_cl_hbm_equal(struct mei_cl *cl,
+			struct mei_msg_hdr *mei_hdr)
+{
+	return cl->host_client_id == mei_hdr->host_addr &&
+		cl->me_client_id == mei_hdr->me_addr;
+}
+/**
+ * mei_cl_is_reading - checks if the client
+		is the one to read this message
+ *
+ * @cl: mei client
+ * @mei_hdr: header of mei message
+ *
+ * returns true on match and false otherwise
+ */
+static bool mei_cl_is_reading(struct mei_cl *cl, struct mei_msg_hdr *mei_hdr)
+{
+	return mei_cl_hbm_equal(cl, mei_hdr) &&
+		cl->state == MEI_FILE_CONNECTED &&
+		cl->reading_state != MEI_READ_COMPLETE;
+}
+
+/**
+ * mei_irq_read_client_message - process client message
+ *
+ * @dev: the device structure
+ * @mei_hdr: header of mei client message
+ * @complete_list: An instance of our list structure
+ *
+ * returns 0 on success, <0 on failure.
+ */
+static int mei_cl_irq_read_msg(struct mei_device *dev,
+			       struct mei_msg_hdr *mei_hdr,
+			       struct mei_cl_cb *complete_list)
+{
+	struct mei_cl *cl;
+	struct mei_cl_cb *cb, *next;
+	unsigned char *buffer = NULL;
+
+	list_for_each_entry_safe(cb, next, &dev->read_list.list, list) {
+		cl = cb->cl;
+		if (!cl || !mei_cl_is_reading(cl, mei_hdr))
+			continue;
+
+		cl->reading_state = MEI_READING;
+
+		if (cb->response_buffer.size == 0 ||
+		    cb->response_buffer.data == NULL) {
+			dev_err(&dev->pdev->dev, "response buffer is not allocated.\n");
+			list_del(&cb->list);
+			return -ENOMEM;
+		}
+
+		if (cb->response_buffer.size < mei_hdr->length + cb->buf_idx) {
+			dev_dbg(&dev->pdev->dev, "message overflow. size %d len %d idx %ld\n",
+				cb->response_buffer.size,
+				mei_hdr->length, cb->buf_idx);
+			buffer = krealloc(cb->response_buffer.data,
+					  mei_hdr->length + cb->buf_idx,
+					  GFP_KERNEL);
+
+			if (!buffer) {
+				dev_err(&dev->pdev->dev, "allocation failed.\n");
+				list_del(&cb->list);
+				return -ENOMEM;
+			}
+			cb->response_buffer.data = buffer;
+			cb->response_buffer.size =
+				mei_hdr->length + cb->buf_idx;
+		}
+
+		buffer = cb->response_buffer.data + cb->buf_idx;
+		mei_read_slots(dev, buffer, mei_hdr->length);
+
+		cb->buf_idx += mei_hdr->length;
+		if (mei_hdr->msg_complete) {
+			cl->status = 0;
+			list_del(&cb->list);
+			dev_dbg(&dev->pdev->dev, "completed read H cl = %d, ME cl = %d, length = %lu\n",
+				cl->host_client_id,
+				cl->me_client_id,
+				cb->buf_idx);
+			list_add_tail(&cb->list, &complete_list->list);
+		}
+		break;
+	}
+
+	dev_dbg(&dev->pdev->dev, "message read\n");
+	if (!buffer) {
+		mei_read_slots(dev, dev->rd_msg_buf, mei_hdr->length);
+		dev_dbg(&dev->pdev->dev, "discarding message " MEI_HDR_FMT "\n",
+				MEI_HDR_PRM(mei_hdr));
+	}
+
+	return 0;
+}
+
+/**
+ * _mei_irq_thread_close - processes close related operation.
+ *
+ * @dev: the device structure.
+ * @slots: free slots.
+ * @cb_pos: callback block.
+ * @cl: private data of the file object.
+ * @cmpl_list: complete list.
+ *
+ * returns 0, OK; otherwise, error.
+ */
+static int _mei_irq_thread_close(struct mei_device *dev, s32 *slots,
+				struct mei_cl_cb *cb_pos,
+				struct mei_cl *cl,
+				struct mei_cl_cb *cmpl_list)
+{
+	u32 msg_slots =
+		mei_data2slots(sizeof(struct hbm_client_connect_request));
+
+	if (*slots < msg_slots)
+		return -EMSGSIZE;
+
+	*slots -= msg_slots;
+
+	if (mei_hbm_cl_disconnect_req(dev, cl)) {
+		cl->status = 0;
+		cb_pos->buf_idx = 0;
+		list_move_tail(&cb_pos->list, &cmpl_list->list);
+		return -EIO;
+	}
+
+	cl->state = MEI_FILE_DISCONNECTING;
+	cl->status = 0;
+	cb_pos->buf_idx = 0;
+	list_move_tail(&cb_pos->list, &dev->ctrl_rd_list.list);
+	cl->timer_count = MEI_CONNECT_TIMEOUT;
+
+	return 0;
+}
+
+
+/**
+ * _mei_irq_thread_read - processes read related operation.
+ *
+ * @dev: the device structure.
+ * @slots: free slots.
+ * @cb_pos: callback block.
+ * @cl: private data of the file object.
+ * @cmpl_list: complete list.
+ *
+ * returns 0, OK; otherwise, error.
+ */
+static int _mei_irq_thread_read(struct mei_device *dev,	s32 *slots,
+			struct mei_cl_cb *cb_pos,
+			struct mei_cl *cl,
+			struct mei_cl_cb *cmpl_list)
+{
+	u32 msg_slots = mei_data2slots(sizeof(struct hbm_flow_control));
+
+	if (*slots < msg_slots) {
+		/* return the cancel routine */
+		list_del(&cb_pos->list);
+		return -EMSGSIZE;
+	}
+
+	*slots -= msg_slots;
+
+	if (mei_hbm_cl_flow_control_req(dev, cl)) {
+		cl->status = -ENODEV;
+		cb_pos->buf_idx = 0;
+		list_move_tail(&cb_pos->list, &cmpl_list->list);
+		return -ENODEV;
+	}
+	list_move_tail(&cb_pos->list, &dev->read_list.list);
+
+	return 0;
+}
+
+
+/**
+ * _mei_irq_thread_ioctl - processes ioctl related operation.
+ *
+ * @dev: the device structure.
+ * @slots: free slots.
+ * @cb_pos: callback block.
+ * @cl: private data of the file object.
+ * @cmpl_list: complete list.
+ *
+ * returns 0, OK; otherwise, error.
+ */
+static int _mei_irq_thread_ioctl(struct mei_device *dev, s32 *slots,
+			struct mei_cl_cb *cb_pos,
+			struct mei_cl *cl,
+			struct mei_cl_cb *cmpl_list)
+{
+	u32 msg_slots =
+		mei_data2slots(sizeof(struct hbm_client_connect_request));
+
+	if (*slots < msg_slots) {
+		/* return the cancel routine */
+		list_del(&cb_pos->list);
+		return -EMSGSIZE;
+	}
+
+	*slots -=  msg_slots;
+
+	cl->state = MEI_FILE_CONNECTING;
+
+	if (mei_hbm_cl_connect_req(dev, cl)) {
+		cl->status = -ENODEV;
+		cb_pos->buf_idx = 0;
+		list_del(&cb_pos->list);
+		return -ENODEV;
+	} else {
+		list_move_tail(&cb_pos->list, &dev->ctrl_rd_list.list);
+		cl->timer_count = MEI_CONNECT_TIMEOUT;
+	}
+	return 0;
+}
+
+/**
+ * mei_irq_thread_write_complete - write messages to device.
+ *
+ * @dev: the device structure.
+ * @slots: free slots.
+ * @cb: callback block.
+ * @cmpl_list: complete list.
+ *
+ * returns 0, OK; otherwise, error.
+ */
+static int mei_irq_thread_write_complete(struct mei_device *dev, s32 *slots,
+			struct mei_cl_cb *cb, struct mei_cl_cb *cmpl_list)
+{
+	struct mei_msg_hdr mei_hdr;
+	struct mei_cl *cl = cb->cl;
+	size_t len = cb->request_buffer.size - cb->buf_idx;
+	u32 msg_slots = mei_data2slots(len);
+
+	mei_hdr.host_addr = cl->host_client_id;
+	mei_hdr.me_addr = cl->me_client_id;
+	mei_hdr.reserved = 0;
+
+	if (*slots >= msg_slots) {
+		mei_hdr.length = len;
+		mei_hdr.msg_complete = 1;
+	/* Split the message only if we can write the whole host buffer */
+	} else if (*slots == dev->hbuf_depth) {
+		msg_slots = *slots;
+		len = (*slots * sizeof(u32)) - sizeof(struct mei_msg_hdr);
+		mei_hdr.length = len;
+		mei_hdr.msg_complete = 0;
+	} else {
+		/* wait for next time the host buffer is empty */
+		return 0;
+	}
+
+	dev_dbg(&dev->pdev->dev, "buf: size = %d idx = %lu\n",
+			cb->request_buffer.size, cb->buf_idx);
+	dev_dbg(&dev->pdev->dev, MEI_HDR_FMT, MEI_HDR_PRM(&mei_hdr));
+
+	*slots -=  msg_slots;
+	if (mei_write_message(dev, &mei_hdr,
+			cb->request_buffer.data + cb->buf_idx)) {
+		cl->status = -ENODEV;
+		list_move_tail(&cb->list, &cmpl_list->list);
+		return -ENODEV;
+	}
+
+
+	cl->status = 0;
+	cb->buf_idx += mei_hdr.length;
+	if (mei_hdr.msg_complete) {
+		if (mei_cl_flow_ctrl_reduce(cl))
+			return -ENODEV;
+		list_move_tail(&cb->list, &dev->write_waiting_list.list);
+	}
+
+	return 0;
+}
+
+/**
+ * mei_irq_read_handler - bottom half read routine after ISR to
+ * handle the read processing.
+ *
+ * @dev: the device structure
+ * @cmpl_list: An instance of our list structure
+ * @slots: slots to read.
+ *
+ * returns 0 on success, <0 on failure.
+ */
+int mei_irq_read_handler(struct mei_device *dev,
+		struct mei_cl_cb *cmpl_list, s32 *slots)
+{
+	struct mei_msg_hdr *mei_hdr;
+	struct mei_cl *cl_pos = NULL;
+	struct mei_cl *cl_next = NULL;
+	int ret = 0;
+
+	if (!dev->rd_msg_hdr) {
+		dev->rd_msg_hdr = mei_read_hdr(dev);
+		dev_dbg(&dev->pdev->dev, "slots =%08x.\n", *slots);
+		(*slots)--;
+		dev_dbg(&dev->pdev->dev, "slots =%08x.\n", *slots);
+	}
+	mei_hdr = (struct mei_msg_hdr *) &dev->rd_msg_hdr;
+	dev_dbg(&dev->pdev->dev, MEI_HDR_FMT, MEI_HDR_PRM(mei_hdr));
+
+	if (mei_hdr->reserved || !dev->rd_msg_hdr) {
+		dev_dbg(&dev->pdev->dev, "corrupted message header.\n");
+		ret = -EBADMSG;
+		goto end;
+	}
+
+	if (mei_hdr->host_addr || mei_hdr->me_addr) {
+		list_for_each_entry_safe(cl_pos, cl_next,
+					&dev->file_list, link) {
+			dev_dbg(&dev->pdev->dev,
+					"list_for_each_entry_safe read host"
+					" client = %d, ME client = %d\n",
+					cl_pos->host_client_id,
+					cl_pos->me_client_id);
+			if (mei_cl_hbm_equal(cl_pos, mei_hdr))
+				break;
+		}
+
+		if (&cl_pos->link == &dev->file_list) {
+			dev_dbg(&dev->pdev->dev, "corrupted message header\n");
+			ret = -EBADMSG;
+			goto end;
+		}
+	}
+	if (((*slots) * sizeof(u32)) < mei_hdr->length) {
+		dev_err(&dev->pdev->dev,
+				"we can't read the message slots =%08x.\n",
+				*slots);
+		/* we can't read the message */
+		ret = -ERANGE;
+		goto end;
+	}
+
+	/* 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_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) &&
+		   (dev->iamthif_state == MEI_IAMTHIF_READING)) {
+
+		dev_dbg(&dev->pdev->dev, "call mei_irq_thread_read_iamthif_message.\n");
+		dev_dbg(&dev->pdev->dev, MEI_HDR_FMT, MEI_HDR_PRM(mei_hdr));
+
+		ret = mei_amthif_irq_read_msg(dev, mei_hdr, cmpl_list);
+		if (ret)
+			goto end;
+	} else {
+		dev_dbg(&dev->pdev->dev, "call mei_cl_irq_read_msg.\n");
+		dev_dbg(&dev->pdev->dev, MEI_HDR_FMT, MEI_HDR_PRM(mei_hdr));
+		ret = mei_cl_irq_read_msg(dev, mei_hdr, cmpl_list);
+		if (ret)
+			goto end;
+	}
+
+	/* reset the number of slots and header */
+	*slots = mei_count_full_read_slots(dev);
+	dev->rd_msg_hdr = 0;
+
+	if (*slots == -EOVERFLOW) {
+		/* overflow - reset */
+		dev_err(&dev->pdev->dev, "resetting due to slots overflow.\n");
+		/* set the event since message has been read */
+		ret = -ERANGE;
+		goto end;
+	}
+end:
+	return ret;
+}
+EXPORT_SYMBOL_GPL(mei_irq_read_handler);
+
+
+/**
+ * mei_irq_write_handler -  dispatch write requests
+ *  after irq received
+ *
+ * @dev: the device structure
+ * @cmpl_list: An instance of our list structure
+ *
+ * returns 0 on success, <0 on failure.
+ */
+int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list)
+{
+
+	struct mei_cl *cl;
+	struct mei_cl_cb *pos = NULL, *next = NULL;
+	struct mei_cl_cb *list;
+	s32 slots;
+	int ret;
+
+	if (!mei_hbuf_is_ready(dev)) {
+		dev_dbg(&dev->pdev->dev, "host buffer is not empty.\n");
+		return 0;
+	}
+	slots = mei_hbuf_empty_slots(dev);
+	if (slots <= 0)
+		return -EMSGSIZE;
+
+	/* complete all waiting for write CB */
+	dev_dbg(&dev->pdev->dev, "complete all waiting for write cb.\n");
+
+	list = &dev->write_waiting_list;
+	list_for_each_entry_safe(pos, next, &list->list, list) {
+		cl = pos->cl;
+		if (cl == NULL)
+			continue;
+
+		cl->status = 0;
+		list_del(&pos->list);
+		if (MEI_WRITING == cl->writing_state &&
+		    pos->fop_type == MEI_FOP_WRITE &&
+		    cl != &dev->iamthif_cl) {
+			dev_dbg(&dev->pdev->dev, "MEI WRITE COMPLETE\n");
+			cl->writing_state = MEI_WRITE_COMPLETE;
+			list_add_tail(&pos->list, &cmpl_list->list);
+		}
+		if (cl == &dev->iamthif_cl) {
+			dev_dbg(&dev->pdev->dev, "check iamthif flow control.\n");
+			if (dev->iamthif_flow_control_pending) {
+				ret = mei_amthif_irq_read(dev, &slots);
+				if (ret)
+					return ret;
+			}
+		}
+	}
+
+	if (dev->wd_state == MEI_WD_STOPPING) {
+		dev->wd_state = MEI_WD_IDLE;
+		wake_up_interruptible(&dev->wait_stop_wd);
+	}
+
+	if (dev->wr_ext_msg.hdr.length) {
+		mei_write_message(dev, &dev->wr_ext_msg.hdr,
+				dev->wr_ext_msg.data);
+		slots -= mei_data2slots(dev->wr_ext_msg.hdr.length);
+		dev->wr_ext_msg.hdr.length = 0;
+	}
+	if (dev->dev_state == MEI_DEV_ENABLED) {
+		if (dev->wd_pending &&
+		    mei_cl_flow_ctrl_creds(&dev->wd_cl) > 0) {
+			if (mei_wd_send(dev))
+				dev_dbg(&dev->pdev->dev, "wd send failed.\n");
+			else if (mei_cl_flow_ctrl_reduce(&dev->wd_cl))
+				return -ENODEV;
+
+			dev->wd_pending = false;
+
+			if (dev->wd_state == MEI_WD_RUNNING)
+				slots -= mei_data2slots(MEI_WD_START_MSG_SIZE);
+			else
+				slots -= mei_data2slots(MEI_WD_STOP_MSG_SIZE);
+		}
+	}
+
+	/* complete control write list CB */
+	dev_dbg(&dev->pdev->dev, "complete control write list cb.\n");
+	list_for_each_entry_safe(pos, next, &dev->ctrl_wr_list.list, list) {
+		cl = pos->cl;
+		if (!cl) {
+			list_del(&pos->list);
+			return -ENODEV;
+		}
+		switch (pos->fop_type) {
+		case MEI_FOP_CLOSE:
+			/* send disconnect message */
+			ret = _mei_irq_thread_close(dev, &slots, pos,
+						cl, cmpl_list);
+			if (ret)
+				return ret;
+
+			break;
+		case MEI_FOP_READ:
+			/* send flow control message */
+			ret = _mei_irq_thread_read(dev, &slots, pos,
+						cl, cmpl_list);
+			if (ret)
+				return ret;
+
+			break;
+		case MEI_FOP_IOCTL:
+			/* connect message */
+			if (mei_cl_is_other_connecting(cl))
+				continue;
+			ret = _mei_irq_thread_ioctl(dev, &slots, pos,
+						cl, cmpl_list);
+			if (ret)
+				return ret;
+
+			break;
+
+		default:
+			BUG();
+		}
+
+	}
+	/* complete  write list CB */
+	dev_dbg(&dev->pdev->dev, "complete write list cb.\n");
+	list_for_each_entry_safe(pos, next, &dev->write_list.list, list) {
+		cl = pos->cl;
+		if (cl == NULL)
+			continue;
+		if (mei_cl_flow_ctrl_creds(cl) <= 0) {
+			dev_dbg(&dev->pdev->dev,
+				"No flow control credentials for client %d, not sending.\n",
+				cl->host_client_id);
+			continue;
+		}
+
+		if (cl == &dev->iamthif_cl)
+			ret = mei_amthif_irq_write_complete(dev, &slots,
+							pos, cmpl_list);
+		else
+			ret = mei_irq_thread_write_complete(dev, &slots, pos,
+						cmpl_list);
+		if (ret)
+			return ret;
+
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mei_irq_write_handler);
+
+
+
+/**
+ * mei_timer - timer function.
+ *
+ * @work: pointer to the work_struct structure
+ *
+ * NOTE: This function is called by timer interrupt work
+ */
+void mei_timer(struct work_struct *work)
+{
+	unsigned long timeout;
+	struct mei_cl *cl_pos = NULL;
+	struct mei_cl *cl_next = NULL;
+	struct mei_cl_cb  *cb_pos = NULL;
+	struct mei_cl_cb  *cb_next = NULL;
+
+	struct mei_device *dev = container_of(work,
+					struct mei_device, timer_work.work);
+
+
+	mutex_lock(&dev->device_lock);
+	if (dev->dev_state != MEI_DEV_ENABLED) {
+		if (dev->dev_state == MEI_DEV_INIT_CLIENTS) {
+			if (dev->init_clients_timer) {
+				if (--dev->init_clients_timer == 0) {
+					dev_err(&dev->pdev->dev, "reset: init clients timeout hbm_state = %d.\n",
+						dev->hbm_state);
+					mei_reset(dev, 1);
+				}
+			}
+		}
+		goto out;
+	}
+	/*** connect/disconnect timeouts ***/
+	list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) {
+		if (cl_pos->timer_count) {
+			if (--cl_pos->timer_count == 0) {
+				dev_err(&dev->pdev->dev, "reset: connect/disconnect timeout.\n");
+				mei_reset(dev, 1);
+				goto out;
+			}
+		}
+	}
+
+	if (dev->iamthif_stall_timer) {
+		if (--dev->iamthif_stall_timer == 0) {
+			dev_err(&dev->pdev->dev, "reset: amthif  hanged.\n");
+			mei_reset(dev, 1);
+			dev->iamthif_msg_buf_size = 0;
+			dev->iamthif_msg_buf_index = 0;
+			dev->iamthif_canceled = false;
+			dev->iamthif_ioctl = true;
+			dev->iamthif_state = MEI_IAMTHIF_IDLE;
+			dev->iamthif_timer = 0;
+
+			mei_io_cb_free(dev->iamthif_current_cb);
+			dev->iamthif_current_cb = NULL;
+
+			dev->iamthif_file_object = NULL;
+			mei_amthif_run_next_cmd(dev);
+		}
+	}
+
+	if (dev->iamthif_timer) {
+
+		timeout = dev->iamthif_timer +
+			mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER);
+
+		dev_dbg(&dev->pdev->dev, "dev->iamthif_timer = %ld\n",
+				dev->iamthif_timer);
+		dev_dbg(&dev->pdev->dev, "timeout = %ld\n", timeout);
+		dev_dbg(&dev->pdev->dev, "jiffies = %ld\n", jiffies);
+		if (time_after(jiffies, timeout)) {
+			/*
+			 * User didn't read the AMTHI data on time (15sec)
+			 * freeing AMTHI for other requests
+			 */
+
+			dev_dbg(&dev->pdev->dev, "freeing AMTHI for other requests\n");
+
+			list_for_each_entry_safe(cb_pos, cb_next,
+				&dev->amthif_rd_complete_list.list, list) {
+
+				cl_pos = cb_pos->file_object->private_data;
+
+				/* Finding the AMTHI entry. */
+				if (cl_pos == &dev->iamthif_cl)
+					list_del(&cb_pos->list);
+			}
+			mei_io_cb_free(dev->iamthif_current_cb);
+			dev->iamthif_current_cb = NULL;
+
+			dev->iamthif_file_object->private_data = NULL;
+			dev->iamthif_file_object = NULL;
+			dev->iamthif_timer = 0;
+			mei_amthif_run_next_cmd(dev);
+
+		}
+	}
+out:
+	schedule_delayed_work(&dev->timer_work, 2 * HZ);
+	mutex_unlock(&dev->device_lock);
+}
+

drivers/misc/mei/main.c

@@ -0,0 +1,740 @@
+/*
+ *
+ * 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.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/aio.h>
+#include <linux/pci.h>
+#include <linux/poll.h>
+#include <linux/init.h>
+#include <linux/ioctl.h>
+#include <linux/cdev.h>
+#include <linux/sched.h>
+#include <linux/uuid.h>
+#include <linux/compat.h>
+#include <linux/jiffies.h>
+#include <linux/interrupt.h>
+#include <linux/miscdevice.h>
+
+#include <linux/mei.h>
+
+#include "mei_dev.h"
+#include "hw-me.h"
+#include "client.h"
+
+/**
+ * mei_open - the open function
+ *
+ * @inode: pointer to inode structure
+ * @file: pointer to file structure
+ e
+ * returns 0 on success, <0 on error
+ */
+static int mei_open(struct inode *inode, struct file *file)
+{
+	struct miscdevice *misc = file->private_data;
+	struct pci_dev *pdev;
+	struct mei_cl *cl;
+	struct mei_device *dev;
+
+	int err;
+
+	err = -ENODEV;
+	if (!misc->parent)
+		goto out;
+
+	pdev = container_of(misc->parent, struct pci_dev, dev);
+
+	dev = pci_get_drvdata(pdev);
+	if (!dev)
+		goto out;
+
+	mutex_lock(&dev->device_lock);
+	err = -ENOMEM;
+	cl = mei_cl_allocate(dev);
+	if (!cl)
+		goto out_unlock;
+
+	err = -ENODEV;
+	if (dev->dev_state != MEI_DEV_ENABLED) {
+		dev_dbg(&dev->pdev->dev, "dev_state != MEI_ENABLED  dev_state = %s\n",
+		    mei_dev_state_str(dev->dev_state));
+		goto out_unlock;
+	}
+	err = -EMFILE;
+	if (dev->open_handle_count >= MEI_MAX_OPEN_HANDLE_COUNT) {
+		dev_err(&dev->pdev->dev, "open_handle_count exceded %d",
+			MEI_MAX_OPEN_HANDLE_COUNT);
+		goto out_unlock;
+	}
+
+	err = mei_cl_link(cl, MEI_HOST_CLIENT_ID_ANY);
+	if (err)
+		goto out_unlock;
+
+	file->private_data = cl;
+	mutex_unlock(&dev->device_lock);
+
+	return nonseekable_open(inode, file);
+
+out_unlock:
+	mutex_unlock(&dev->device_lock);
+	kfree(cl);
+out:
+	return err;
+}
+
+/**
+ * mei_release - the release function
+ *
+ * @inode: pointer to inode structure
+ * @file: pointer to file structure
+ *
+ * returns 0 on success, <0 on error
+ */
+static int mei_release(struct inode *inode, struct file *file)
+{
+	struct mei_cl *cl = file->private_data;
+	struct mei_cl_cb *cb;
+	struct mei_device *dev;
+	int rets = 0;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	mutex_lock(&dev->device_lock);
+	if (cl == &dev->iamthif_cl) {
+		rets = mei_amthif_release(dev, file);
+		goto out;
+	}
+	if (cl->state == MEI_FILE_CONNECTED) {
+		cl->state = MEI_FILE_DISCONNECTING;
+		dev_dbg(&dev->pdev->dev,
+			"disconnecting client host client = %d, "
+		    "ME client = %d\n",
+		    cl->host_client_id,
+		    cl->me_client_id);
+		rets = mei_cl_disconnect(cl);
+	}
+	mei_cl_flush_queues(cl);
+	dev_dbg(&dev->pdev->dev, "remove client host client = %d, ME client = %d\n",
+	    cl->host_client_id,
+	    cl->me_client_id);
+
+	if (dev->open_handle_count > 0) {
+		clear_bit(cl->host_client_id, dev->host_clients_map);
+		dev->open_handle_count--;
+	}
+	mei_cl_unlink(cl);
+
+
+	/* free read cb */
+	cb = NULL;
+	if (cl->read_cb) {
+		cb = mei_cl_find_read_cb(cl);
+		/* Remove entry from read list */
+		if (cb)
+			list_del(&cb->list);
+
+		cb = cl->read_cb;
+		cl->read_cb = NULL;
+	}
+
+	file->private_data = NULL;
+
+	if (cb) {
+		mei_io_cb_free(cb);
+		cb = NULL;
+	}
+
+	kfree(cl);
+out:
+	mutex_unlock(&dev->device_lock);
+	return rets;
+}
+
+
+/**
+ * mei_read - the read function.
+ *
+ * @file: pointer to file structure
+ * @ubuf: pointer to user buffer
+ * @length: buffer length
+ * @offset: data offset in buffer
+ *
+ * returns >=0 data length on success , <0 on error
+ */
+static ssize_t mei_read(struct file *file, char __user *ubuf,
+			size_t length, loff_t *offset)
+{
+	struct mei_cl *cl = file->private_data;
+	struct mei_cl_cb *cb_pos = NULL;
+	struct mei_cl_cb *cb = NULL;
+	struct mei_device *dev;
+	int i;
+	int rets;
+	int err;
+
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	mutex_lock(&dev->device_lock);
+	if (dev->dev_state != MEI_DEV_ENABLED) {
+		rets = -ENODEV;
+		goto out;
+	}
+
+	if ((cl->sm_state & MEI_WD_STATE_INDEPENDENCE_MSG_SENT) == 0) {
+		/* Do not allow to read watchdog client */
+		i = mei_me_cl_by_uuid(dev, &mei_wd_guid);
+		if (i >= 0) {
+			struct mei_me_client *me_client = &dev->me_clients[i];
+			if (cl->me_client_id == me_client->client_id) {
+				rets = -EBADF;
+				goto out;
+			}
+		}
+	} else {
+		cl->sm_state &= ~MEI_WD_STATE_INDEPENDENCE_MSG_SENT;
+	}
+
+	if (cl == &dev->iamthif_cl) {
+		rets = mei_amthif_read(dev, file, ubuf, length, offset);
+		goto out;
+	}
+
+	if (cl->read_cb && cl->read_cb->buf_idx > *offset) {
+		cb = cl->read_cb;
+		goto copy_buffer;
+	} else if (cl->read_cb && cl->read_cb->buf_idx > 0 &&
+		   cl->read_cb->buf_idx <= *offset) {
+		cb = cl->read_cb;
+		rets = 0;
+		goto free;
+	} else if ((!cl->read_cb || !cl->read_cb->buf_idx) && *offset > 0) {
+		/*Offset needs to be cleaned for contiguous reads*/
+		*offset = 0;
+		rets = 0;
+		goto out;
+	}
+
+	err = mei_cl_read_start(cl, length);
+	if (err && err != -EBUSY) {
+		dev_dbg(&dev->pdev->dev,
+			"mei start read failure with status = %d\n", err);
+		rets = err;
+		goto out;
+	}
+
+	if (MEI_READ_COMPLETE != cl->reading_state &&
+			!waitqueue_active(&cl->rx_wait)) {
+		if (file->f_flags & O_NONBLOCK) {
+			rets = -EAGAIN;
+			goto out;
+		}
+
+		mutex_unlock(&dev->device_lock);
+
+		if (wait_event_interruptible(cl->rx_wait,
+				MEI_READ_COMPLETE == cl->reading_state ||
+				mei_cl_is_transitioning(cl))) {
+
+			if (signal_pending(current))
+				return -EINTR;
+			return -ERESTARTSYS;
+		}
+
+		mutex_lock(&dev->device_lock);
+		if (mei_cl_is_transitioning(cl)) {
+			rets = -EBUSY;
+			goto out;
+		}
+	}
+
+	cb = cl->read_cb;
+
+	if (!cb) {
+		rets = -ENODEV;
+		goto out;
+	}
+	if (cl->reading_state != MEI_READ_COMPLETE) {
+		rets = 0;
+		goto out;
+	}
+	/* now copy the data to user space */
+copy_buffer:
+	dev_dbg(&dev->pdev->dev, "buf.size = %d buf.idx= %ld\n",
+	    cb->response_buffer.size, cb->buf_idx);
+	if (length == 0 || ubuf == NULL || *offset > cb->buf_idx) {
+		rets = -EMSGSIZE;
+		goto free;
+	}
+
+	/* length is being truncated to PAGE_SIZE,
+	 * however buf_idx may point beyond that */
+	length = min_t(size_t, length, cb->buf_idx - *offset);
+
+	if (copy_to_user(ubuf, cb->response_buffer.data + *offset, length)) {
+		rets = -EFAULT;
+		goto free;
+	}
+
+	rets = length;
+	*offset += length;
+	if ((unsigned long)*offset < cb->buf_idx)
+		goto out;
+
+free:
+	cb_pos = mei_cl_find_read_cb(cl);
+	/* Remove entry from read list */
+	if (cb_pos)
+		list_del(&cb_pos->list);
+	mei_io_cb_free(cb);
+	cl->reading_state = MEI_IDLE;
+	cl->read_cb = NULL;
+out:
+	dev_dbg(&dev->pdev->dev, "end mei read rets= %d\n", rets);
+	mutex_unlock(&dev->device_lock);
+	return rets;
+}
+/**
+ * mei_write - the write function.
+ *
+ * @file: pointer to file structure
+ * @ubuf: pointer to user buffer
+ * @length: buffer length
+ * @offset: data offset in buffer
+ *
+ * returns >=0 data length on success , <0 on error
+ */
+static ssize_t mei_write(struct file *file, const char __user *ubuf,
+			 size_t length, loff_t *offset)
+{
+	struct mei_cl *cl = file->private_data;
+	struct mei_cl_cb *write_cb = NULL;
+	struct mei_device *dev;
+	unsigned long timeout = 0;
+	int rets;
+	int id;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	mutex_lock(&dev->device_lock);
+
+	if (dev->dev_state != MEI_DEV_ENABLED) {
+		rets = -ENODEV;
+		goto out;
+	}
+
+	id = mei_me_cl_by_id(dev, cl->me_client_id);
+	if (id < 0) {
+		rets = -ENODEV;
+		goto out;
+	}
+	if (length > dev->me_clients[id].props.max_msg_length || length <= 0) {
+		rets = -EMSGSIZE;
+		goto out;
+	}
+
+	if (cl->state != MEI_FILE_CONNECTED) {
+		dev_err(&dev->pdev->dev, "host client = %d,  is not connected to ME client = %d",
+			cl->host_client_id, cl->me_client_id);
+		rets = -ENODEV;
+		goto out;
+	}
+	if (cl == &dev->iamthif_cl) {
+		write_cb = mei_amthif_find_read_list_entry(dev, file);
+
+		if (write_cb) {
+			timeout = write_cb->read_time +
+				mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER);
+
+			if (time_after(jiffies, timeout) ||
+			    cl->reading_state == MEI_READ_COMPLETE) {
+				*offset = 0;
+				list_del(&write_cb->list);
+				mei_io_cb_free(write_cb);
+				write_cb = NULL;
+			}
+		}
+	}
+
+	/* free entry used in read */
+	if (cl->reading_state == MEI_READ_COMPLETE) {
+		*offset = 0;
+		write_cb = mei_cl_find_read_cb(cl);
+		if (write_cb) {
+			list_del(&write_cb->list);
+			mei_io_cb_free(write_cb);
+			write_cb = NULL;
+			cl->reading_state = MEI_IDLE;
+			cl->read_cb = NULL;
+		}
+	} else if (cl->reading_state == MEI_IDLE)
+		*offset = 0;
+
+
+	write_cb = mei_io_cb_init(cl, file);
+	if (!write_cb) {
+		dev_err(&dev->pdev->dev, "write cb allocation failed\n");
+		rets = -ENOMEM;
+		goto out;
+	}
+	rets = mei_io_cb_alloc_req_buf(write_cb, length);
+	if (rets)
+		goto out;
+
+	rets = copy_from_user(write_cb->request_buffer.data, ubuf, length);
+	if (rets)
+		goto out;
+
+	cl->sm_state = 0;
+	if (length == 4 &&
+	    ((memcmp(mei_wd_state_independence_msg[0],
+				 write_cb->request_buffer.data, 4) == 0) ||
+	     (memcmp(mei_wd_state_independence_msg[1],
+				 write_cb->request_buffer.data, 4) == 0) ||
+	     (memcmp(mei_wd_state_independence_msg[2],
+				 write_cb->request_buffer.data, 4) == 0)))
+		cl->sm_state |= MEI_WD_STATE_INDEPENDENCE_MSG_SENT;
+
+	if (cl == &dev->iamthif_cl) {
+		rets = mei_amthif_write(dev, write_cb);
+
+		if (rets) {
+			dev_err(&dev->pdev->dev,
+				"amthif write failed with status = %d\n", rets);
+			goto out;
+		}
+		mutex_unlock(&dev->device_lock);
+		return length;
+	}
+
+	rets = mei_cl_write(cl, write_cb, false);
+out:
+	mutex_unlock(&dev->device_lock);
+	if (rets < 0)
+		mei_io_cb_free(write_cb);
+	return rets;
+}
+
+/**
+ * mei_ioctl_connect_client - the connect to fw client IOCTL function
+ *
+ * @dev: the device structure
+ * @data: IOCTL connect data, input and output parameters
+ * @file: private data of the file object
+ *
+ * Locking: called under "dev->device_lock" lock
+ *
+ * returns 0 on success, <0 on failure.
+ */
+static int mei_ioctl_connect_client(struct file *file,
+			struct mei_connect_client_data *data)
+{
+	struct mei_device *dev;
+	struct mei_client *client;
+	struct mei_cl *cl;
+	int i;
+	int rets;
+
+	cl = file->private_data;
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	if (dev->dev_state != MEI_DEV_ENABLED) {
+		rets = -ENODEV;
+		goto end;
+	}
+
+	if (cl->state != MEI_FILE_INITIALIZING &&
+	    cl->state != MEI_FILE_DISCONNECTED) {
+		rets = -EBUSY;
+		goto end;
+	}
+
+	/* find ME client we're trying to connect to */
+	i = mei_me_cl_by_uuid(dev, &data->in_client_uuid);
+	if (i < 0 || dev->me_clients[i].props.fixed_address) {
+		dev_dbg(&dev->pdev->dev, "Cannot connect to FW Client UUID = %pUl\n",
+				&data->in_client_uuid);
+		rets = -ENODEV;
+		goto end;
+	}
+
+	cl->me_client_id = dev->me_clients[i].client_id;
+	cl->state = MEI_FILE_CONNECTING;
+
+	dev_dbg(&dev->pdev->dev, "Connect to FW Client ID = %d\n",
+			cl->me_client_id);
+	dev_dbg(&dev->pdev->dev, "FW Client - Protocol Version = %d\n",
+			dev->me_clients[i].props.protocol_version);
+	dev_dbg(&dev->pdev->dev, "FW Client - Max Msg Len = %d\n",
+			dev->me_clients[i].props.max_msg_length);
+
+	/* if we're connecting to amthif client then we will use the
+	 * existing connection
+	 */
+	if (uuid_le_cmp(data->in_client_uuid, mei_amthif_guid) == 0) {
+		dev_dbg(&dev->pdev->dev, "FW Client is amthi\n");
+		if (dev->iamthif_cl.state != MEI_FILE_CONNECTED) {
+			rets = -ENODEV;
+			goto end;
+		}
+		clear_bit(cl->host_client_id, dev->host_clients_map);
+		mei_cl_unlink(cl);
+
+		kfree(cl);
+		cl = NULL;
+		file->private_data = &dev->iamthif_cl;
+
+		client = &data->out_client_properties;
+		client->max_msg_length =
+			dev->me_clients[i].props.max_msg_length;
+		client->protocol_version =
+			dev->me_clients[i].props.protocol_version;
+		rets = dev->iamthif_cl.status;
+
+		goto end;
+	}
+
+
+	/* prepare the output buffer */
+	client = &data->out_client_properties;
+	client->max_msg_length = dev->me_clients[i].props.max_msg_length;
+	client->protocol_version = dev->me_clients[i].props.protocol_version;
+	dev_dbg(&dev->pdev->dev, "Can connect?\n");
+
+
+	rets = mei_cl_connect(cl, file);
+
+end:
+	return rets;
+}
+
+
+/**
+ * mei_ioctl - the IOCTL function
+ *
+ * @file: pointer to file structure
+ * @cmd: ioctl command
+ * @data: pointer to mei message structure
+ *
+ * returns 0 on success , <0 on error
+ */
+static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data)
+{
+	struct mei_device *dev;
+	struct mei_cl *cl = file->private_data;
+	struct mei_connect_client_data *connect_data = NULL;
+	int rets;
+
+	if (cmd != IOCTL_MEI_CONNECT_CLIENT)
+		return -EINVAL;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	dev_dbg(&dev->pdev->dev, "IOCTL cmd = 0x%x", cmd);
+
+	mutex_lock(&dev->device_lock);
+	if (dev->dev_state != MEI_DEV_ENABLED) {
+		rets = -ENODEV;
+		goto out;
+	}
+
+	dev_dbg(&dev->pdev->dev, ": IOCTL_MEI_CONNECT_CLIENT.\n");
+
+	connect_data = kzalloc(sizeof(struct mei_connect_client_data),
+							GFP_KERNEL);
+	if (!connect_data) {
+		rets = -ENOMEM;
+		goto out;
+	}
+	dev_dbg(&dev->pdev->dev, "copy connect data from user\n");
+	if (copy_from_user(connect_data, (char __user *)data,
+				sizeof(struct mei_connect_client_data))) {
+		dev_dbg(&dev->pdev->dev, "failed to copy data from userland\n");
+		rets = -EFAULT;
+		goto out;
+	}
+
+	rets = mei_ioctl_connect_client(file, connect_data);
+
+	/* if all is ok, copying the data back to user. */
+	if (rets)
+		goto out;
+
+	dev_dbg(&dev->pdev->dev, "copy connect data to user\n");
+	if (copy_to_user((char __user *)data, connect_data,
+				sizeof(struct mei_connect_client_data))) {
+		dev_dbg(&dev->pdev->dev, "failed to copy data to userland\n");
+		rets = -EFAULT;
+		goto out;
+	}
+
+out:
+	kfree(connect_data);
+	mutex_unlock(&dev->device_lock);
+	return rets;
+}
+
+/**
+ * mei_compat_ioctl - the compat IOCTL function
+ *
+ * @file: pointer to file structure
+ * @cmd: ioctl command
+ * @data: pointer to mei message structure
+ *
+ * returns 0 on success , <0 on error
+ */
+#ifdef CONFIG_COMPAT
+static long mei_compat_ioctl(struct file *file,
+			unsigned int cmd, unsigned long data)
+{
+	return mei_ioctl(file, cmd, (unsigned long)compat_ptr(data));
+}
+#endif
+
+
+/**
+ * mei_poll - the poll function
+ *
+ * @file: pointer to file structure
+ * @wait: pointer to poll_table structure
+ *
+ * returns poll mask
+ */
+static unsigned int mei_poll(struct file *file, poll_table *wait)
+{
+	struct mei_cl *cl = file->private_data;
+	struct mei_device *dev;
+	unsigned int mask = 0;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return mask;
+
+	dev = cl->dev;
+
+	mutex_lock(&dev->device_lock);
+
+	if (dev->dev_state != MEI_DEV_ENABLED)
+		goto out;
+
+
+	if (cl == &dev->iamthif_cl) {
+		mask = mei_amthif_poll(dev, file, wait);
+		goto out;
+	}
+
+	mutex_unlock(&dev->device_lock);
+	poll_wait(file, &cl->tx_wait, wait);
+	mutex_lock(&dev->device_lock);
+	if (MEI_WRITE_COMPLETE == cl->writing_state)
+		mask |= (POLLIN | POLLRDNORM);
+
+out:
+	mutex_unlock(&dev->device_lock);
+	return mask;
+}
+
+/*
+ * file operations structure will be used for mei char device.
+ */
+static const struct file_operations mei_fops = {
+	.owner = THIS_MODULE,
+	.read = mei_read,
+	.unlocked_ioctl = mei_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = mei_compat_ioctl,
+#endif
+	.open = mei_open,
+	.release = mei_release,
+	.write = mei_write,
+	.poll = mei_poll,
+	.llseek = no_llseek
+};
+
+/*
+ * Misc Device Struct
+ */
+static struct miscdevice  mei_misc_device = {
+		.name = "mei",
+		.fops = &mei_fops,
+		.minor = MISC_DYNAMIC_MINOR,
+};
+
+
+int mei_register(struct mei_device *dev)
+{
+	int ret;
+	mei_misc_device.parent = &dev->pdev->dev;
+	ret = misc_register(&mei_misc_device);
+	if (ret)
+		return ret;
+
+	if (mei_dbgfs_register(dev, mei_misc_device.name))
+		dev_err(&dev->pdev->dev, "cannot register debugfs\n");
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mei_register);
+
+void mei_deregister(struct mei_device *dev)
+{
+	mei_dbgfs_deregister(dev);
+	misc_deregister(&mei_misc_device);
+	mei_misc_device.parent = NULL;
+}
+EXPORT_SYMBOL_GPL(mei_deregister);
+
+static int __init mei_init(void)
+{
+	return mei_cl_bus_init();
+}
+
+static void __exit mei_exit(void)
+{
+	mei_cl_bus_exit();
+}
+
+module_init(mei_init);
+module_exit(mei_exit);
+
+MODULE_AUTHOR("Intel Corporation");
+MODULE_DESCRIPTION("Intel(R) Management Engine Interface");
+MODULE_LICENSE("GPL v2");
+

drivers/misc/mei/mei_dev.h

@@ -0,0 +1,648 @@
+/*
+ *
+ * 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.
+ *
+ */
+
+#ifndef _MEI_DEV_H_
+#define _MEI_DEV_H_
+
+#include <linux/types.h>
+#include <linux/watchdog.h>
+#include <linux/poll.h>
+#include <linux/mei.h>
+#include <linux/mei_cl_bus.h>
+
+#include "hw.h"
+#include "hw-me-regs.h"
+#include "hbm.h"
+
+/*
+ * watch dog definition
+ */
+#define MEI_WD_HDR_SIZE       4
+#define MEI_WD_STOP_MSG_SIZE  MEI_WD_HDR_SIZE
+#define MEI_WD_START_MSG_SIZE (MEI_WD_HDR_SIZE + 16)
+
+#define MEI_WD_DEFAULT_TIMEOUT   120  /* seconds */
+#define MEI_WD_MIN_TIMEOUT       120  /* seconds */
+#define MEI_WD_MAX_TIMEOUT     65535  /* seconds */
+
+#define MEI_WD_STOP_TIMEOUT      10 /* msecs */
+
+#define MEI_WD_STATE_INDEPENDENCE_MSG_SENT       (1 << 0)
+
+#define MEI_RD_MSG_BUF_SIZE           (128 * sizeof(u32))
+
+
+/*
+ * AMTHI Client UUID
+ */
+extern const uuid_le mei_amthif_guid;
+
+/*
+ * Watchdog Client UUID
+ */
+extern const uuid_le mei_wd_guid;
+
+/*
+ * Watchdog independence state message
+ */
+extern const u8 mei_wd_state_independence_msg[3][4];
+
+/*
+ * Number of Maximum MEI Clients
+ */
+#define MEI_CLIENTS_MAX 256
+
+/*
+ * Number of File descriptors/handles
+ * that can be opened to the driver.
+ *
+ * Limit to 255: 256 Total Clients
+ * minus internal client for MEI Bus Messags
+ */
+#define  MEI_MAX_OPEN_HANDLE_COUNT (MEI_CLIENTS_MAX - 1)
+
+/*
+ * Internal Clients Number
+ */
+#define MEI_HOST_CLIENT_ID_ANY        (-1)
+#define MEI_HBM_HOST_CLIENT_ID         0 /* not used, just for documentation */
+#define MEI_WD_HOST_CLIENT_ID          1
+#define MEI_IAMTHIF_HOST_CLIENT_ID     2
+
+
+/* File state */
+enum file_state {
+	MEI_FILE_INITIALIZING = 0,
+	MEI_FILE_CONNECTING,
+	MEI_FILE_CONNECTED,
+	MEI_FILE_DISCONNECTING,
+	MEI_FILE_DISCONNECTED
+};
+
+/* MEI device states */
+enum mei_dev_state {
+	MEI_DEV_INITIALIZING = 0,
+	MEI_DEV_INIT_CLIENTS,
+	MEI_DEV_ENABLED,
+	MEI_DEV_RESETTING,
+	MEI_DEV_DISABLED,
+	MEI_DEV_POWER_DOWN,
+	MEI_DEV_POWER_UP
+};
+
+const char *mei_dev_state_str(int state);
+
+enum iamthif_states {
+	MEI_IAMTHIF_IDLE,
+	MEI_IAMTHIF_WRITING,
+	MEI_IAMTHIF_FLOW_CONTROL,
+	MEI_IAMTHIF_READING,
+	MEI_IAMTHIF_READ_COMPLETE
+};
+
+enum mei_file_transaction_states {
+	MEI_IDLE,
+	MEI_WRITING,
+	MEI_WRITE_COMPLETE,
+	MEI_FLOW_CONTROL,
+	MEI_READING,
+	MEI_READ_COMPLETE
+};
+
+enum mei_wd_states {
+	MEI_WD_IDLE,
+	MEI_WD_RUNNING,
+	MEI_WD_STOPPING,
+};
+
+/**
+ * enum mei_cb_file_ops  - file operation associated with the callback
+ * @MEI_FOP_READ   - read
+ * @MEI_FOP_WRITE  - write
+ * @MEI_FOP_IOCTL  - ioctl
+ * @MEI_FOP_OPEN   - open
+ * @MEI_FOP_CLOSE  - close
+ */
+enum mei_cb_file_ops {
+	MEI_FOP_READ = 0,
+	MEI_FOP_WRITE,
+	MEI_FOP_IOCTL,
+	MEI_FOP_OPEN,
+	MEI_FOP_CLOSE
+};
+
+/*
+ * Intel MEI message data struct
+ */
+struct mei_msg_data {
+	u32 size;
+	unsigned char *data;
+};
+
+/**
+ * struct mei_me_client - representation of me (fw) client
+ *
+ * @props  - client properties
+ * @client_id - me client id
+ * @mei_flow_ctrl_creds - flow control credits
+ */
+struct mei_me_client {
+	struct mei_client_properties props;
+	u8 client_id;
+	u8 mei_flow_ctrl_creds;
+};
+
+
+struct mei_cl;
+
+/**
+ * struct mei_cl_cb - file operation callback structure
+ *
+ * @cl - file client who is running this operation
+ * @fop_type - file operation type
+ */
+struct mei_cl_cb {
+	struct list_head list;
+	struct mei_cl *cl;
+	enum mei_cb_file_ops fop_type;
+	struct mei_msg_data request_buffer;
+	struct mei_msg_data response_buffer;
+	unsigned long buf_idx;
+	unsigned long read_time;
+	struct file *file_object;
+};
+
+/* MEI client instance carried as file->pirvate_data*/
+struct mei_cl {
+	struct list_head link;
+	struct mei_device *dev;
+	enum file_state state;
+	wait_queue_head_t tx_wait;
+	wait_queue_head_t rx_wait;
+	wait_queue_head_t wait;
+	int status;
+	/* ID of client connected */
+	u8 host_client_id;
+	u8 me_client_id;
+	u8 mei_flow_ctrl_creds;
+	u8 timer_count;
+	enum mei_file_transaction_states reading_state;
+	enum mei_file_transaction_states writing_state;
+	int sm_state;
+	struct mei_cl_cb *read_cb;
+
+	/* MEI CL bus data */
+	struct mei_cl_device *device;
+	struct list_head device_link;
+	uuid_le device_uuid;
+};
+
+/** struct mei_hw_ops
+ *
+ * @host_is_ready    - query for host readiness
+
+ * @hw_is_ready      - query if hw is ready
+ * @hw_reset         - reset hw
+ * @hw_start         - start hw after reset
+ * @hw_config        - configure hw
+
+ * @intr_clear       - clear pending interrupts
+ * @intr_enable      - enable interrupts
+ * @intr_disable     - disable interrupts
+
+ * @hbuf_free_slots  - query for write buffer empty slots
+ * @hbuf_is_ready    - query if write buffer is empty
+ * @hbuf_max_len     - query for write buffer max len
+
+ * @write            - write a message to FW
+
+ * @rdbuf_full_slots - query how many slots are filled
+
+ * @read_hdr         - get first 4 bytes (header)
+ * @read             - read a buffer from the FW
+ */
+struct mei_hw_ops {
+
+	bool (*host_is_ready) (struct mei_device *dev);
+
+	bool (*hw_is_ready) (struct mei_device *dev);
+	void (*hw_reset) (struct mei_device *dev, bool enable);
+	int  (*hw_start) (struct mei_device *dev);
+	void (*hw_config) (struct mei_device *dev);
+
+	void (*intr_clear) (struct mei_device *dev);
+	void (*intr_enable) (struct mei_device *dev);
+	void (*intr_disable) (struct mei_device *dev);
+
+	int (*hbuf_free_slots) (struct mei_device *dev);
+	bool (*hbuf_is_ready) (struct mei_device *dev);
+	size_t (*hbuf_max_len) (const struct mei_device *dev);
+
+	int (*write)(struct mei_device *dev,
+		     struct mei_msg_hdr *hdr,
+		     unsigned char *buf);
+
+	int (*rdbuf_full_slots)(struct mei_device *dev);
+
+	u32 (*read_hdr)(const struct mei_device *dev);
+	int (*read) (struct mei_device *dev,
+		     unsigned char *buf, unsigned long len);
+};
+
+/* MEI bus API*/
+
+/**
+ * struct mei_cl_ops - MEI CL device ops
+ * This structure allows ME host clients to implement technology
+ * specific operations.
+ *
+ * @enable: Enable an MEI CL device. Some devices require specific
+ *	HECI commands to initialize completely.
+ * @disable: Disable an MEI CL device.
+ * @send: Tx hook for the device. This allows ME host clients to trap
+ *	the device driver buffers before actually physically
+ *	pushing it to the ME.
+ * @recv: Rx hook for the device. This allows ME host clients to trap the
+ *	ME buffers before forwarding them to the device driver.
+ */
+struct mei_cl_ops {
+	int (*enable)(struct mei_cl_device *device);
+	int (*disable)(struct mei_cl_device *device);
+	int (*send)(struct mei_cl_device *device, u8 *buf, size_t length);
+	int (*recv)(struct mei_cl_device *device, u8 *buf, size_t length);
+};
+
+struct mei_cl_device *mei_cl_add_device(struct mei_device *dev,
+					uuid_le uuid, char *name,
+					struct mei_cl_ops *ops);
+void mei_cl_remove_device(struct mei_cl_device *device);
+
+int __mei_cl_async_send(struct mei_cl *cl, u8 *buf, size_t length);
+int __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length);
+int __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length);
+void mei_cl_bus_rx_event(struct mei_cl *cl);
+int mei_cl_bus_init(void);
+void mei_cl_bus_exit(void);
+
+
+/**
+ * struct mei_cl_device - MEI device handle
+ * An mei_cl_device pointer is returned from mei_add_device()
+ * and links MEI bus clients to their actual ME host client pointer.
+ * Drivers for MEI devices will get an mei_cl_device pointer
+ * when being probed and shall use it for doing ME bus I/O.
+ *
+ * @dev: linux driver model device pointer
+ * @uuid: me client uuid
+ * @cl: mei client
+ * @ops: ME transport ops
+ * @event_cb: Drivers register this callback to get asynchronous ME
+ *	events (e.g. Rx buffer pending) notifications.
+ * @events: Events bitmask sent to the driver.
+ * @priv_data: client private data
+ */
+struct mei_cl_device {
+	struct device dev;
+
+	struct mei_cl *cl;
+
+	const struct mei_cl_ops *ops;
+
+	struct work_struct event_work;
+	mei_cl_event_cb_t event_cb;
+	void *event_context;
+	unsigned long events;
+
+	void *priv_data;
+};
+
+/**
+ * struct mei_device -  MEI private device struct
+
+ * @hbm_state - state of host bus message protocol
+ * @mem_addr - mem mapped base register address
+
+ * @hbuf_depth - depth of hardware host/write buffer is slots
+ * @hbuf_is_ready - query if the host host/write buffer is ready
+ * @wr_msg - the buffer for hbm control messages
+ * @wr_ext_msg - the buffer for hbm control responses (set in read cycle)
+ */
+struct mei_device {
+	struct pci_dev *pdev;	/* pointer to pci device struct */
+	/*
+	 * lists of queues
+	 */
+	/* array of pointers to aio lists */
+	struct mei_cl_cb read_list;		/* driver read queue */
+	struct mei_cl_cb write_list;		/* driver write queue */
+	struct mei_cl_cb write_waiting_list;	/* write waiting queue */
+	struct mei_cl_cb ctrl_wr_list;		/* managed write IOCTL list */
+	struct mei_cl_cb ctrl_rd_list;		/* managed read IOCTL list */
+
+	/*
+	 * list of files
+	 */
+	struct list_head file_list;
+	long open_handle_count;
+
+	/*
+	 * lock for the device
+	 */
+	struct mutex device_lock; /* device lock */
+	struct delayed_work timer_work;	/* MEI timer delayed work (timeouts) */
+
+	bool recvd_hw_ready;
+	/*
+	 * waiting queue for receive message from FW
+	 */
+	wait_queue_head_t wait_hw_ready;
+	wait_queue_head_t wait_recvd_msg;
+	wait_queue_head_t wait_stop_wd;
+
+	/*
+	 * mei device  states
+	 */
+	enum mei_dev_state dev_state;
+	enum mei_hbm_state hbm_state;
+	u16 init_clients_timer;
+
+	unsigned char rd_msg_buf[MEI_RD_MSG_BUF_SIZE];	/* control messages */
+	u32 rd_msg_hdr;
+
+	/* write buffer */
+	u8 hbuf_depth;
+	bool hbuf_is_ready;
+
+	/* used for control messages */
+	struct {
+		struct mei_msg_hdr hdr;
+		unsigned char data[128];
+	} wr_msg;
+
+	struct {
+		struct mei_msg_hdr hdr;
+		unsigned char data[4];	/* All HBM messages are 4 bytes */
+	} wr_ext_msg;		/* for control responses */
+
+	struct hbm_version version;
+
+	struct mei_me_client *me_clients; /* Note: memory has to be allocated */
+	DECLARE_BITMAP(me_clients_map, MEI_CLIENTS_MAX);
+	DECLARE_BITMAP(host_clients_map, MEI_CLIENTS_MAX);
+	unsigned long me_clients_num;
+	unsigned long me_client_presentation_num;
+	unsigned long me_client_index;
+
+	struct mei_cl wd_cl;
+	enum mei_wd_states wd_state;
+	bool wd_pending;
+	u16 wd_timeout;
+	unsigned char wd_data[MEI_WD_START_MSG_SIZE];
+
+
+	/* amthif list for cmd waiting */
+	struct mei_cl_cb amthif_cmd_list;
+	/* driver managed amthif list for reading completed amthif cmd data */
+	struct mei_cl_cb amthif_rd_complete_list;
+	struct file *iamthif_file_object;
+	struct mei_cl iamthif_cl;
+	struct mei_cl_cb *iamthif_current_cb;
+	int iamthif_mtu;
+	unsigned long iamthif_timer;
+	u32 iamthif_stall_timer;
+	unsigned char *iamthif_msg_buf; /* Note: memory has to be allocated */
+	u32 iamthif_msg_buf_size;
+	u32 iamthif_msg_buf_index;
+	enum iamthif_states iamthif_state;
+	bool iamthif_flow_control_pending;
+	bool iamthif_ioctl;
+	bool iamthif_canceled;
+
+	struct work_struct init_work;
+
+	/* List of bus devices */
+	struct list_head device_list;
+
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+	struct dentry *dbgfs_dir;
+#endif /* CONFIG_DEBUG_FS */
+
+
+	const struct mei_hw_ops *ops;
+	char hw[0] __aligned(sizeof(void *));
+};
+
+static inline unsigned long mei_secs_to_jiffies(unsigned long sec)
+{
+	return msecs_to_jiffies(sec * MSEC_PER_SEC);
+}
+
+/**
+ * mei_data2slots - get slots - number of (dwords) from a message length
+ *	+ size of the mei header
+ * @length - size of the messages in bytes
+ * returns  - number of slots
+ */
+static inline u32 mei_data2slots(size_t length)
+{
+	return DIV_ROUND_UP(sizeof(struct mei_msg_hdr) + length, 4);
+}
+
+/*
+ * mei init function prototypes
+ */
+void mei_device_init(struct mei_device *dev);
+void mei_reset(struct mei_device *dev, int interrupts);
+int mei_start(struct mei_device *dev);
+void mei_stop(struct mei_device *dev);
+
+/*
+ *  MEI interrupt functions prototype
+ */
+
+void mei_timer(struct work_struct *work);
+int mei_irq_read_handler(struct mei_device *dev,
+		struct mei_cl_cb *cmpl_list, s32 *slots);
+
+int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list);
+void mei_irq_compl_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list);
+
+/*
+ * AMTHIF - AMT Host Interface Functions
+ */
+void mei_amthif_reset_params(struct mei_device *dev);
+
+int mei_amthif_host_init(struct mei_device *dev);
+
+int mei_amthif_write(struct mei_device *dev, struct mei_cl_cb *priv_cb);
+
+int mei_amthif_read(struct mei_device *dev, struct file *file,
+		char __user *ubuf, size_t length, loff_t *offset);
+
+unsigned int mei_amthif_poll(struct mei_device *dev,
+		struct file *file, poll_table *wait);
+
+int mei_amthif_release(struct mei_device *dev, struct file *file);
+
+struct mei_cl_cb *mei_amthif_find_read_list_entry(struct mei_device *dev,
+						struct file *file);
+
+void mei_amthif_run_next_cmd(struct mei_device *dev);
+
+int mei_amthif_irq_write_complete(struct mei_device *dev, s32 *slots,
+			struct mei_cl_cb *cb, struct mei_cl_cb *cmpl_list);
+
+void mei_amthif_complete(struct mei_device *dev, struct mei_cl_cb *cb);
+int mei_amthif_irq_read_msg(struct mei_device *dev,
+			    struct mei_msg_hdr *mei_hdr,
+			    struct mei_cl_cb *complete_list);
+int mei_amthif_irq_read(struct mei_device *dev, s32 *slots);
+
+/*
+ * NFC functions
+ */
+int mei_nfc_host_init(struct mei_device *dev);
+void mei_nfc_host_exit(void);
+
+/*
+ * NFC Client UUID
+ */
+extern const uuid_le mei_nfc_guid;
+
+int mei_amthif_irq_write_complete(struct mei_device *dev, s32 *slots,
+			struct mei_cl_cb *cb, struct mei_cl_cb *cmpl_list);
+
+void mei_amthif_complete(struct mei_device *dev, struct mei_cl_cb *cb);
+int mei_amthif_irq_read_message(struct mei_cl_cb *complete_list,
+		struct mei_device *dev, struct mei_msg_hdr *mei_hdr);
+int mei_amthif_irq_read(struct mei_device *dev, s32 *slots);
+
+
+int mei_wd_send(struct mei_device *dev);
+int mei_wd_stop(struct mei_device *dev);
+int mei_wd_host_init(struct mei_device *dev);
+/*
+ * mei_watchdog_register  - Registering watchdog interface
+ *   once we got connection to the WD Client
+ * @dev - mei device
+ */
+void mei_watchdog_register(struct mei_device *dev);
+/*
+ * mei_watchdog_unregister  - Unregistering watchdog interface
+ * @dev - mei device
+ */
+void mei_watchdog_unregister(struct mei_device *dev);
+
+/*
+ * Register Access Function
+ */
+
+static inline void mei_hw_config(struct mei_device *dev)
+{
+	dev->ops->hw_config(dev);
+}
+static inline void mei_hw_reset(struct mei_device *dev, bool enable)
+{
+	dev->ops->hw_reset(dev, enable);
+}
+
+static inline void mei_hw_start(struct mei_device *dev)
+{
+	dev->ops->hw_start(dev);
+}
+
+static inline void mei_clear_interrupts(struct mei_device *dev)
+{
+	dev->ops->intr_clear(dev);
+}
+
+static inline void mei_enable_interrupts(struct mei_device *dev)
+{
+	dev->ops->intr_enable(dev);
+}
+
+static inline void mei_disable_interrupts(struct mei_device *dev)
+{
+	dev->ops->intr_disable(dev);
+}
+
+static inline bool mei_host_is_ready(struct mei_device *dev)
+{
+	return dev->ops->host_is_ready(dev);
+}
+static inline bool mei_hw_is_ready(struct mei_device *dev)
+{
+	return dev->ops->hw_is_ready(dev);
+}
+
+static inline bool mei_hbuf_is_ready(struct mei_device *dev)
+{
+	return dev->ops->hbuf_is_ready(dev);
+}
+
+static inline int mei_hbuf_empty_slots(struct mei_device *dev)
+{
+	return dev->ops->hbuf_free_slots(dev);
+}
+
+static inline size_t mei_hbuf_max_len(const struct mei_device *dev)
+{
+	return dev->ops->hbuf_max_len(dev);
+}
+
+static inline int mei_write_message(struct mei_device *dev,
+			struct mei_msg_hdr *hdr,
+			unsigned char *buf)
+{
+	return dev->ops->write(dev, hdr, buf);
+}
+
+static inline u32 mei_read_hdr(const struct mei_device *dev)
+{
+	return dev->ops->read_hdr(dev);
+}
+
+static inline void mei_read_slots(struct mei_device *dev,
+		     unsigned char *buf, unsigned long len)
+{
+	dev->ops->read(dev, buf, len);
+}
+
+static inline int mei_count_full_read_slots(struct mei_device *dev)
+{
+	return dev->ops->rdbuf_full_slots(dev);
+}
+
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+int mei_dbgfs_register(struct mei_device *dev, const char *name);
+void mei_dbgfs_deregister(struct mei_device *dev);
+#else
+static inline int mei_dbgfs_register(struct mei_device *dev, const char *name)
+{
+	return 0;
+}
+static inline void mei_dbgfs_deregister(struct mei_device *dev) {}
+#endif /* CONFIG_DEBUG_FS */
+
+int mei_register(struct mei_device *dev);
+void mei_deregister(struct mei_device *dev);
+
+#define MEI_HDR_FMT "hdr:host=%02d me=%02d len=%d comp=%1d"
+#define MEI_HDR_PRM(hdr)                  \
+	(hdr)->host_addr, (hdr)->me_addr, \
+	(hdr)->length, (hdr)->msg_complete
+
+#endif

drivers/misc/mei/nfc.c

@@ -0,0 +1,556 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2003-2013, 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/kernel.h>
+#include <linux/sched.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/device.h>
+#include <linux/pci.h>
+#include <linux/mei_cl_bus.h>
+
+#include "mei_dev.h"
+#include "client.h"
+
+struct mei_nfc_cmd {
+	u8 command;
+	u8 status;
+	u16 req_id;
+	u32 reserved;
+	u16 data_size;
+	u8 sub_command;
+	u8 data[];
+} __packed;
+
+struct mei_nfc_reply {
+	u8 command;
+	u8 status;
+	u16 req_id;
+	u32 reserved;
+	u16 data_size;
+	u8 sub_command;
+	u8 reply_status;
+	u8 data[];
+} __packed;
+
+struct mei_nfc_if_version {
+	u8 radio_version_sw[3];
+	u8 reserved[3];
+	u8 radio_version_hw[3];
+	u8 i2c_addr;
+	u8 fw_ivn;
+	u8 vendor_id;
+	u8 radio_type;
+} __packed;
+
+struct mei_nfc_connect {
+	u8 fw_ivn;
+	u8 vendor_id;
+} __packed;
+
+struct mei_nfc_connect_resp {
+	u8 fw_ivn;
+	u8 vendor_id;
+	u16 me_major;
+	u16 me_minor;
+	u16 me_hotfix;
+	u16 me_build;
+} __packed;
+
+struct mei_nfc_hci_hdr {
+	u8 cmd;
+	u8 status;
+	u16 req_id;
+	u32 reserved;
+	u16 data_size;
+} __packed;
+
+#define MEI_NFC_CMD_MAINTENANCE 0x00
+#define MEI_NFC_CMD_HCI_SEND 0x01
+#define MEI_NFC_CMD_HCI_RECV 0x02
+
+#define MEI_NFC_SUBCMD_CONNECT    0x00
+#define MEI_NFC_SUBCMD_IF_VERSION 0x01
+
+#define MEI_NFC_HEADER_SIZE 10
+
+/** mei_nfc_dev - NFC mei device
+ *
+ * @cl: NFC host client
+ * @cl_info: NFC info host client
+ * @init_work: perform connection to the info client
+ * @fw_ivn: NFC Intervace Version Number
+ * @vendor_id: NFC manufacturer ID
+ * @radio_type: NFC radio type
+ */
+struct mei_nfc_dev {
+	struct mei_cl *cl;
+	struct mei_cl *cl_info;
+	struct work_struct init_work;
+	wait_queue_head_t send_wq;
+	u8 fw_ivn;
+	u8 vendor_id;
+	u8 radio_type;
+	char *bus_name;
+
+	u16 req_id;
+	u16 recv_req_id;
+};
+
+static struct mei_nfc_dev nfc_dev;
+
+/* UUIDs for NFC F/W clients */
+const uuid_le mei_nfc_guid = UUID_LE(0x0bb17a78, 0x2a8e, 0x4c50,
+				     0x94, 0xd4, 0x50, 0x26,
+				     0x67, 0x23, 0x77, 0x5c);
+
+static const uuid_le mei_nfc_info_guid = UUID_LE(0xd2de1625, 0x382d, 0x417d,
+					0x48, 0xa4, 0xef, 0xab,
+					0xba, 0x8a, 0x12, 0x06);
+
+/* Vendors */
+#define MEI_NFC_VENDOR_INSIDE 0x00
+#define MEI_NFC_VENDOR_NXP    0x01
+
+/* Radio types */
+#define MEI_NFC_VENDOR_INSIDE_UREAD 0x00
+#define MEI_NFC_VENDOR_NXP_PN544    0x01
+
+static void mei_nfc_free(struct mei_nfc_dev *ndev)
+{
+	if (ndev->cl) {
+		list_del(&ndev->cl->device_link);
+		mei_cl_unlink(ndev->cl);
+		kfree(ndev->cl);
+	}
+
+	if (ndev->cl_info) {
+		list_del(&ndev->cl_info->device_link);
+		mei_cl_unlink(ndev->cl_info);
+		kfree(ndev->cl_info);
+	}
+
+	memset(ndev, 0, sizeof(struct mei_nfc_dev));
+}
+
+static int mei_nfc_build_bus_name(struct mei_nfc_dev *ndev)
+{
+	struct mei_device *dev;
+
+	if (!ndev->cl)
+		return -ENODEV;
+
+	dev = ndev->cl->dev;
+
+	switch (ndev->vendor_id) {
+	case MEI_NFC_VENDOR_INSIDE:
+		switch (ndev->radio_type) {
+		case MEI_NFC_VENDOR_INSIDE_UREAD:
+			ndev->bus_name = "microread";
+			return 0;
+
+		default:
+			dev_err(&dev->pdev->dev, "Unknow radio type 0x%x\n",
+				ndev->radio_type);
+
+			return -EINVAL;
+		}
+
+	case MEI_NFC_VENDOR_NXP:
+		switch (ndev->radio_type) {
+		case MEI_NFC_VENDOR_NXP_PN544:
+			ndev->bus_name = "pn544";
+			return 0;
+		default:
+			dev_err(&dev->pdev->dev, "Unknow radio type 0x%x\n",
+				ndev->radio_type);
+
+			return -EINVAL;
+		}
+
+	default:
+		dev_err(&dev->pdev->dev, "Unknow vendor ID 0x%x\n",
+			ndev->vendor_id);
+
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int mei_nfc_connect(struct mei_nfc_dev *ndev)
+{
+	struct mei_device *dev;
+	struct mei_cl *cl;
+	struct mei_nfc_cmd *cmd, *reply;
+	struct mei_nfc_connect *connect;
+	struct mei_nfc_connect_resp *connect_resp;
+	size_t connect_length, connect_resp_length;
+	int bytes_recv, ret;
+
+	cl = ndev->cl;
+	dev = cl->dev;
+
+	connect_length = sizeof(struct mei_nfc_cmd) +
+			sizeof(struct mei_nfc_connect);
+
+	connect_resp_length = sizeof(struct mei_nfc_cmd) +
+			sizeof(struct mei_nfc_connect_resp);
+
+	cmd = kzalloc(connect_length, GFP_KERNEL);
+	if (!cmd)
+		return -ENOMEM;
+	connect = (struct mei_nfc_connect *)cmd->data;
+
+	reply = kzalloc(connect_resp_length, GFP_KERNEL);
+	if (!reply) {
+		kfree(cmd);
+		return -ENOMEM;
+	}
+
+	connect_resp = (struct mei_nfc_connect_resp *)reply->data;
+
+	cmd->command = MEI_NFC_CMD_MAINTENANCE;
+	cmd->data_size = 3;
+	cmd->sub_command = MEI_NFC_SUBCMD_CONNECT;
+	connect->fw_ivn = ndev->fw_ivn;
+	connect->vendor_id = ndev->vendor_id;
+
+	ret = __mei_cl_send(cl, (u8 *)cmd, connect_length);
+	if (ret < 0) {
+		dev_err(&dev->pdev->dev, "Could not send connect cmd\n");
+		goto err;
+	}
+
+	bytes_recv = __mei_cl_recv(cl, (u8 *)reply, connect_resp_length);
+	if (bytes_recv < 0) {
+		dev_err(&dev->pdev->dev, "Could not read connect response\n");
+		ret = bytes_recv;
+		goto err;
+	}
+
+	dev_info(&dev->pdev->dev, "IVN 0x%x Vendor ID 0x%x\n",
+		 connect_resp->fw_ivn, connect_resp->vendor_id);
+
+	dev_info(&dev->pdev->dev, "ME FW %d.%d.%d.%d\n",
+		connect_resp->me_major, connect_resp->me_minor,
+		connect_resp->me_hotfix, connect_resp->me_build);
+
+	ret = 0;
+
+err:
+	kfree(reply);
+	kfree(cmd);
+
+	return ret;
+}
+
+static int mei_nfc_if_version(struct mei_nfc_dev *ndev)
+{
+	struct mei_device *dev;
+	struct mei_cl *cl;
+
+	struct mei_nfc_cmd cmd;
+	struct mei_nfc_reply *reply = NULL;
+	struct mei_nfc_if_version *version;
+	size_t if_version_length;
+	int bytes_recv, ret;
+
+	cl = ndev->cl_info;
+	dev = cl->dev;
+
+	memset(&cmd, 0, sizeof(struct mei_nfc_cmd));
+	cmd.command = MEI_NFC_CMD_MAINTENANCE;
+	cmd.data_size = 1;
+	cmd.sub_command = MEI_NFC_SUBCMD_IF_VERSION;
+
+	ret = __mei_cl_send(cl, (u8 *)&cmd, sizeof(struct mei_nfc_cmd));
+	if (ret < 0) {
+		dev_err(&dev->pdev->dev, "Could not send IF version cmd\n");
+		return ret;
+	}
+
+	/* to be sure on the stack we alloc memory */
+	if_version_length = sizeof(struct mei_nfc_reply) +
+		sizeof(struct mei_nfc_if_version);
+
+	reply = kzalloc(if_version_length, GFP_KERNEL);
+	if (!reply)
+		return -ENOMEM;
+
+	bytes_recv = __mei_cl_recv(cl, (u8 *)reply, if_version_length);
+	if (bytes_recv < 0 || bytes_recv < sizeof(struct mei_nfc_reply)) {
+		dev_err(&dev->pdev->dev, "Could not read IF version\n");
+		ret = -EIO;
+		goto err;
+	}
+
+	version = (struct mei_nfc_if_version *)reply->data;
+
+	ndev->fw_ivn = version->fw_ivn;
+	ndev->vendor_id = version->vendor_id;
+	ndev->radio_type = version->radio_type;
+
+err:
+	kfree(reply);
+	return ret;
+}
+
+static int mei_nfc_enable(struct mei_cl_device *cldev)
+{
+	struct mei_device *dev;
+	struct mei_nfc_dev *ndev = &nfc_dev;
+	int ret;
+
+	dev = ndev->cl->dev;
+
+	ret = mei_nfc_connect(ndev);
+	if (ret < 0) {
+		dev_err(&dev->pdev->dev, "Could not connect to NFC");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int mei_nfc_disable(struct mei_cl_device *cldev)
+{
+	return 0;
+}
+
+static int mei_nfc_send(struct mei_cl_device *cldev, u8 *buf, size_t length)
+{
+	struct mei_device *dev;
+	struct mei_nfc_dev *ndev;
+	struct mei_nfc_hci_hdr *hdr;
+	u8 *mei_buf;
+	int err;
+
+	ndev = (struct mei_nfc_dev *) cldev->priv_data;
+	dev = ndev->cl->dev;
+
+	mei_buf = kzalloc(length + MEI_NFC_HEADER_SIZE, GFP_KERNEL);
+	if (!mei_buf)
+		return -ENOMEM;
+
+	hdr = (struct mei_nfc_hci_hdr *) mei_buf;
+	hdr->cmd = MEI_NFC_CMD_HCI_SEND;
+	hdr->status = 0;
+	hdr->req_id = ndev->req_id;
+	hdr->reserved = 0;
+	hdr->data_size = length;
+
+	memcpy(mei_buf + MEI_NFC_HEADER_SIZE, buf, length);
+
+	err = __mei_cl_send(ndev->cl, mei_buf, length + MEI_NFC_HEADER_SIZE);
+	if (err < 0)
+		return err;
+
+	kfree(mei_buf);
+
+	if (!wait_event_interruptible_timeout(ndev->send_wq,
+				ndev->recv_req_id == ndev->req_id, HZ)) {
+		dev_err(&dev->pdev->dev, "NFC MEI command timeout\n");
+		err = -ETIMEDOUT;
+	} else {
+		ndev->req_id++;
+	}
+
+	return err;
+}
+
+static int mei_nfc_recv(struct mei_cl_device *cldev, u8 *buf, size_t length)
+{
+	struct mei_nfc_dev *ndev;
+	struct mei_nfc_hci_hdr *hci_hdr;
+	int received_length;
+
+	ndev = (struct mei_nfc_dev *)cldev->priv_data;
+
+	received_length = __mei_cl_recv(ndev->cl, buf, length);
+	if (received_length < 0)
+		return received_length;
+
+	hci_hdr = (struct mei_nfc_hci_hdr *) buf;
+
+	if (hci_hdr->cmd == MEI_NFC_CMD_HCI_SEND) {
+		ndev->recv_req_id = hci_hdr->req_id;
+		wake_up(&ndev->send_wq);
+
+		return 0;
+	}
+
+	return received_length;
+}
+
+static struct mei_cl_ops nfc_ops = {
+	.enable = mei_nfc_enable,
+	.disable = mei_nfc_disable,
+	.send = mei_nfc_send,
+	.recv = mei_nfc_recv,
+};
+
+static void mei_nfc_init(struct work_struct *work)
+{
+	struct mei_device *dev;
+	struct mei_cl_device *cldev;
+	struct mei_nfc_dev *ndev;
+	struct mei_cl *cl_info;
+
+	ndev = container_of(work, struct mei_nfc_dev, init_work);
+
+	cl_info = ndev->cl_info;
+	dev = cl_info->dev;
+
+	mutex_lock(&dev->device_lock);
+
+	if (mei_cl_connect(cl_info, NULL) < 0) {
+		mutex_unlock(&dev->device_lock);
+		dev_err(&dev->pdev->dev,
+			"Could not connect to the NFC INFO ME client");
+
+		goto err;
+	}
+
+	mutex_unlock(&dev->device_lock);
+
+	if (mei_nfc_if_version(ndev) < 0) {
+		dev_err(&dev->pdev->dev, "Could not get the NFC interfave version");
+
+		goto err;
+	}
+
+	dev_info(&dev->pdev->dev,
+		"NFC MEI VERSION: IVN 0x%x Vendor ID 0x%x Type 0x%x\n",
+		ndev->fw_ivn, ndev->vendor_id, ndev->radio_type);
+
+	mutex_lock(&dev->device_lock);
+
+	if (mei_cl_disconnect(cl_info) < 0) {
+		mutex_unlock(&dev->device_lock);
+		dev_err(&dev->pdev->dev,
+			"Could not disconnect the NFC INFO ME client");
+
+		goto err;
+	}
+
+	mutex_unlock(&dev->device_lock);
+
+	if (mei_nfc_build_bus_name(ndev) < 0) {
+		dev_err(&dev->pdev->dev,
+			"Could not build the bus ID name\n");
+		return;
+	}
+
+	cldev = mei_cl_add_device(dev, mei_nfc_guid, ndev->bus_name, &nfc_ops);
+	if (!cldev) {
+		dev_err(&dev->pdev->dev,
+			"Could not add the NFC device to the MEI bus\n");
+
+		goto err;
+	}
+
+	cldev->priv_data = ndev;
+
+
+	return;
+
+err:
+	mei_nfc_free(ndev);
+
+	return;
+}
+
+
+int mei_nfc_host_init(struct mei_device *dev)
+{
+	struct mei_nfc_dev *ndev = &nfc_dev;
+	struct mei_cl *cl_info, *cl = NULL;
+	int i, ret;
+
+	/* already initialzed */
+	if (ndev->cl_info)
+		return 0;
+
+	cl_info = mei_cl_allocate(dev);
+	cl = mei_cl_allocate(dev);
+
+	if (!cl || !cl_info) {
+		ret = -ENOMEM;
+		goto err;
+	}
+
+	/* check for valid client id */
+	i = mei_me_cl_by_uuid(dev, &mei_nfc_info_guid);
+	if (i < 0) {
+		dev_info(&dev->pdev->dev, "nfc: failed to find the client\n");
+		ret = -ENOENT;
+		goto err;
+	}
+
+	cl_info->me_client_id = dev->me_clients[i].client_id;
+
+	ret = mei_cl_link(cl_info, MEI_HOST_CLIENT_ID_ANY);
+	if (ret)
+		goto err;
+
+	cl_info->device_uuid = mei_nfc_info_guid;
+
+	list_add_tail(&cl_info->device_link, &dev->device_list);
+
+	/* check for valid client id */
+	i = mei_me_cl_by_uuid(dev, &mei_nfc_guid);
+	if (i < 0) {
+		dev_info(&dev->pdev->dev, "nfc: failed to find the client\n");
+		ret = -ENOENT;
+		goto err;
+	}
+
+	cl->me_client_id = dev->me_clients[i].client_id;
+
+	ret = mei_cl_link(cl, MEI_HOST_CLIENT_ID_ANY);
+	if (ret)
+		goto err;
+
+	cl->device_uuid = mei_nfc_guid;
+
+	list_add_tail(&cl->device_link, &dev->device_list);
+
+	ndev->cl_info = cl_info;
+	ndev->cl = cl;
+	ndev->req_id = 1;
+
+	INIT_WORK(&ndev->init_work, mei_nfc_init);
+	init_waitqueue_head(&ndev->send_wq);
+	schedule_work(&ndev->init_work);
+
+	return 0;
+
+err:
+	mei_nfc_free(ndev);
+
+	return ret;
+}
+
+void mei_nfc_host_exit(void)
+{
+	struct mei_nfc_dev *ndev = &nfc_dev;
+
+	if (ndev->cl && ndev->cl->device)
+		mei_cl_remove_device(ndev->cl->device);
+
+	mei_nfc_free(ndev);
+}

drivers/misc/mei/pci-me.c

@@ -0,0 +1,358 @@
+/*
+ *
+ * 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.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/aio.h>
+#include <linux/pci.h>
+#include <linux/poll.h>
+#include <linux/init.h>
+#include <linux/ioctl.h>
+#include <linux/cdev.h>
+#include <linux/sched.h>
+#include <linux/uuid.h>
+#include <linux/compat.h>
+#include <linux/jiffies.h>
+#include <linux/interrupt.h>
+#include <linux/miscdevice.h>
+
+#include <linux/mei.h>
+
+#include "mei_dev.h"
+#include "hw-me.h"
+#include "client.h"
+
+/* AMT device is a singleton on the platform */
+static struct pci_dev *mei_pdev;
+
+/* mei_pci_tbl - PCI Device ID Table */
+static DEFINE_PCI_DEVICE_TABLE(mei_me_pci_tbl) = {
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82946GZ)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82G35)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82Q965)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82G965)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82GM965)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82GME965)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82Q35)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82G33)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82Q33)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82X38)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_3200)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_6)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_7)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_8)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_9)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_10)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_1)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_2)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_3)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_4)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_1)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_2)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_3)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_4)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_IBXPK_1)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_IBXPK_2)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_CPT_1)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PBG_1)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_1)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_2)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_3)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_LPT)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_LPT_LP)},
+
+	/* required last entry */
+	{0, }
+};
+
+MODULE_DEVICE_TABLE(pci, mei_me_pci_tbl);
+
+static DEFINE_MUTEX(mei_mutex);
+
+/**
+ * mei_quirk_probe - probe for devices that doesn't valid ME interface
+ *
+ * @pdev: PCI device structure
+ * @ent: entry into pci_device_table
+ *
+ * returns true if ME Interface is valid, false otherwise
+ */
+static bool mei_me_quirk_probe(struct pci_dev *pdev,
+				const struct pci_device_id *ent)
+{
+	u32 reg;
+	if (ent->device == MEI_DEV_ID_PBG_1) {
+		pci_read_config_dword(pdev, 0x48, &reg);
+		/* make sure that bit 9 is up and bit 10 is down */
+		if ((reg & 0x600) == 0x200) {
+			dev_info(&pdev->dev, "Device doesn't have valid ME Interface\n");
+			return false;
+		}
+	}
+	return true;
+}
+/**
+ * mei_probe - Device Initialization Routine
+ *
+ * @pdev: PCI device structure
+ * @ent: entry in kcs_pci_tbl
+ *
+ * returns 0 on success, <0 on failure.
+ */
+static int mei_me_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	struct mei_device *dev;
+	struct mei_me_hw *hw;
+	int err;
+
+	mutex_lock(&mei_mutex);
+
+	if (!mei_me_quirk_probe(pdev, ent)) {
+		err = -ENODEV;
+		goto end;
+	}
+
+	if (mei_pdev) {
+		err = -EEXIST;
+		goto end;
+	}
+	/* enable pci dev */
+	err = pci_enable_device(pdev);
+	if (err) {
+		dev_err(&pdev->dev, "failed to enable pci device.\n");
+		goto end;
+	}
+	/* set PCI host mastering  */
+	pci_set_master(pdev);
+	/* pci request regions for mei driver */
+	err = pci_request_regions(pdev, KBUILD_MODNAME);
+	if (err) {
+		dev_err(&pdev->dev, "failed to get pci regions.\n");
+		goto disable_device;
+	}
+	/* allocates and initializes the mei dev structure */
+	dev = mei_me_dev_init(pdev);
+	if (!dev) {
+		err = -ENOMEM;
+		goto release_regions;
+	}
+	hw = to_me_hw(dev);
+	/* mapping  IO device memory */
+	hw->mem_addr = pci_iomap(pdev, 0, 0);
+	if (!hw->mem_addr) {
+		dev_err(&pdev->dev, "mapping I/O device memory failure.\n");
+		err = -ENOMEM;
+		goto free_device;
+	}
+	pci_enable_msi(pdev);
+
+	 /* request and enable interrupt */
+	if (pci_dev_msi_enabled(pdev))
+		err = request_threaded_irq(pdev->irq,
+			NULL,
+			mei_me_irq_thread_handler,
+			IRQF_ONESHOT, KBUILD_MODNAME, dev);
+	else
+		err = request_threaded_irq(pdev->irq,
+			mei_me_irq_quick_handler,
+			mei_me_irq_thread_handler,
+			IRQF_SHARED, KBUILD_MODNAME, dev);
+
+	if (err) {
+		dev_err(&pdev->dev, "request_threaded_irq failure. irq = %d\n",
+		       pdev->irq);
+		goto disable_msi;
+	}
+
+	if (mei_start(dev)) {
+		dev_err(&pdev->dev, "init hw failure.\n");
+		err = -ENODEV;
+		goto release_irq;
+	}
+
+	err = mei_register(dev);
+	if (err)
+		goto release_irq;
+
+	mei_pdev = pdev;
+	pci_set_drvdata(pdev, dev);
+
+	schedule_delayed_work(&dev->timer_work, HZ);
+
+	mutex_unlock(&mei_mutex);
+
+	pr_debug("initialization successful.\n");
+
+	return 0;
+
+release_irq:
+	mei_disable_interrupts(dev);
+	flush_scheduled_work();
+	free_irq(pdev->irq, dev);
+disable_msi:
+	pci_disable_msi(pdev);
+	pci_iounmap(pdev, hw->mem_addr);
+free_device:
+	kfree(dev);
+release_regions:
+	pci_release_regions(pdev);
+disable_device:
+	pci_disable_device(pdev);
+end:
+	mutex_unlock(&mei_mutex);
+	dev_err(&pdev->dev, "initialization failed.\n");
+	return err;
+}
+
+/**
+ * mei_remove - Device Removal Routine
+ *
+ * @pdev: PCI device structure
+ *
+ * mei_remove is called by the PCI subsystem to alert the driver
+ * that it should release a PCI device.
+ */
+static void mei_me_remove(struct pci_dev *pdev)
+{
+	struct mei_device *dev;
+	struct mei_me_hw *hw;
+
+	if (mei_pdev != pdev)
+		return;
+
+	dev = pci_get_drvdata(pdev);
+	if (!dev)
+		return;
+
+	hw = to_me_hw(dev);
+
+
+	dev_err(&pdev->dev, "stop\n");
+	mei_stop(dev);
+
+	mei_pdev = NULL;
+
+	/* disable interrupts */
+	mei_disable_interrupts(dev);
+
+	free_irq(pdev->irq, dev);
+	pci_disable_msi(pdev);
+	pci_set_drvdata(pdev, NULL);
+
+	if (hw->mem_addr)
+		pci_iounmap(pdev, hw->mem_addr);
+
+	mei_deregister(dev);
+
+	kfree(dev);
+
+	pci_release_regions(pdev);
+	pci_disable_device(pdev);
+
+
+}
+#ifdef CONFIG_PM
+static int mei_me_pci_suspend(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+	struct mei_device *dev = pci_get_drvdata(pdev);
+
+	if (!dev)
+		return -ENODEV;
+
+	dev_err(&pdev->dev, "suspend\n");
+
+	mei_stop(dev);
+
+	mei_disable_interrupts(dev);
+
+	free_irq(pdev->irq, dev);
+	pci_disable_msi(pdev);
+
+	return 0;
+}
+
+static int mei_me_pci_resume(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+	struct mei_device *dev;
+	int err;
+
+	dev = pci_get_drvdata(pdev);
+	if (!dev)
+		return -ENODEV;
+
+	pci_enable_msi(pdev);
+
+	/* request and enable interrupt */
+	if (pci_dev_msi_enabled(pdev))
+		err = request_threaded_irq(pdev->irq,
+			NULL,
+			mei_me_irq_thread_handler,
+			IRQF_ONESHOT, KBUILD_MODNAME, dev);
+	else
+		err = request_threaded_irq(pdev->irq,
+			mei_me_irq_quick_handler,
+			mei_me_irq_thread_handler,
+			IRQF_SHARED, KBUILD_MODNAME, dev);
+
+	if (err) {
+		dev_err(&pdev->dev, "request_threaded_irq failed: irq = %d.\n",
+				pdev->irq);
+		return err;
+	}
+
+	mutex_lock(&dev->device_lock);
+	dev->dev_state = MEI_DEV_POWER_UP;
+	mei_clear_interrupts(dev);
+	mei_reset(dev, 1);
+	mutex_unlock(&dev->device_lock);
+
+	/* Start timer if stopped in suspend */
+	schedule_delayed_work(&dev->timer_work, HZ);
+
+	return err;
+}
+static SIMPLE_DEV_PM_OPS(mei_me_pm_ops, mei_me_pci_suspend, mei_me_pci_resume);
+#define MEI_ME_PM_OPS	(&mei_me_pm_ops)
+#else
+#define MEI_ME_PM_OPS	NULL
+#endif /* CONFIG_PM */
+/*
+ *  PCI driver structure
+ */
+static struct pci_driver mei_me_driver = {
+	.name = KBUILD_MODNAME,
+	.id_table = mei_me_pci_tbl,
+	.probe = mei_me_probe,
+	.remove = mei_me_remove,
+	.shutdown = mei_me_remove,
+	.driver.pm = MEI_ME_PM_OPS,
+};
+
+module_pci_driver(mei_me_driver);
+
+MODULE_AUTHOR("Intel Corporation");
+MODULE_DESCRIPTION("Intel(R) Management Engine Interface");
+MODULE_LICENSE("GPL v2");

drivers/misc/mei/wd.c

@@ -0,0 +1,392 @@
+/*
+ *
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/device.h>
+#include <linux/pci.h>
+#include <linux/sched.h>
+#include <linux/watchdog.h>
+
+#include <linux/mei.h>
+
+#include "mei_dev.h"
+#include "hbm.h"
+#include "hw-me.h"
+#include "client.h"
+
+static const u8 mei_start_wd_params[] = { 0x02, 0x12, 0x13, 0x10 };
+static const u8 mei_stop_wd_params[] = { 0x02, 0x02, 0x14, 0x10 };
+
+const u8 mei_wd_state_independence_msg[3][4] = {
+	{0x05, 0x02, 0x51, 0x10},
+	{0x05, 0x02, 0x52, 0x10},
+	{0x07, 0x02, 0x01, 0x10}
+};
+
+/*
+ * AMT Watchdog Device
+ */
+#define INTEL_AMT_WATCHDOG_ID "INTCAMT"
+
+/* UUIDs for AMT F/W clients */
+const uuid_le mei_wd_guid = UUID_LE(0x05B79A6F, 0x4628, 0x4D7F, 0x89,
+						0x9D, 0xA9, 0x15, 0x14, 0xCB,
+						0x32, 0xAB);
+
+static void mei_wd_set_start_timeout(struct mei_device *dev, u16 timeout)
+{
+	dev_dbg(&dev->pdev->dev, "wd: set timeout=%d.\n", timeout);
+	memcpy(dev->wd_data, mei_start_wd_params, MEI_WD_HDR_SIZE);
+	memcpy(dev->wd_data + MEI_WD_HDR_SIZE, &timeout, sizeof(u16));
+}
+
+/**
+ * mei_wd_host_init - connect to the watchdog client
+ *
+ * @dev: the device structure
+ *
+ * returns -ENENT if wd client cannot be found
+ *         -EIO if write has failed
+ *         0 on success
+ */
+int mei_wd_host_init(struct mei_device *dev)
+{
+	struct mei_cl *cl = &dev->wd_cl;
+	int i;
+	int ret;
+
+	mei_cl_init(cl, dev);
+
+	dev->wd_timeout = MEI_WD_DEFAULT_TIMEOUT;
+	dev->wd_state = MEI_WD_IDLE;
+
+
+	/* check for valid client id */
+	i = mei_me_cl_by_uuid(dev, &mei_wd_guid);
+	if (i < 0) {
+		dev_info(&dev->pdev->dev, "wd: failed to find the client\n");
+		return -ENOENT;
+	}
+
+	cl->me_client_id = dev->me_clients[i].client_id;
+
+	ret = mei_cl_link(cl, MEI_WD_HOST_CLIENT_ID);
+
+	if (ret < 0) {
+		dev_info(&dev->pdev->dev, "wd: failed link client\n");
+		return -ENOENT;
+	}
+
+	cl->state = MEI_FILE_CONNECTING;
+
+	if (mei_hbm_cl_connect_req(dev, cl)) {
+		dev_err(&dev->pdev->dev, "wd: failed to connect to the client\n");
+		cl->state = MEI_FILE_DISCONNECTED;
+		cl->host_client_id = 0;
+		return -EIO;
+	}
+	cl->timer_count = MEI_CONNECT_TIMEOUT;
+
+	return 0;
+}
+
+/**
+ * mei_wd_send - sends watch dog message to fw.
+ *
+ * @dev: the device structure
+ *
+ * returns 0 if success,
+ *	-EIO when message send fails
+ *	-EINVAL when invalid message is to be sent
+ */
+int mei_wd_send(struct mei_device *dev)
+{
+	struct mei_msg_hdr hdr;
+
+	hdr.host_addr = dev->wd_cl.host_client_id;
+	hdr.me_addr = dev->wd_cl.me_client_id;
+	hdr.msg_complete = 1;
+	hdr.reserved = 0;
+
+	if (!memcmp(dev->wd_data, mei_start_wd_params, MEI_WD_HDR_SIZE))
+		hdr.length = MEI_WD_START_MSG_SIZE;
+	else if (!memcmp(dev->wd_data, mei_stop_wd_params, MEI_WD_HDR_SIZE))
+		hdr.length = MEI_WD_STOP_MSG_SIZE;
+	else
+		return -EINVAL;
+
+	return mei_write_message(dev, &hdr, dev->wd_data);
+}
+
+/**
+ * mei_wd_stop - sends watchdog stop message to fw.
+ *
+ * @dev: the device structure
+ * @preserve: indicate if to keep the timeout value
+ *
+ * returns 0 if success,
+ *	-EIO when message send fails
+ *	-EINVAL when invalid message is to be sent
+ */
+int mei_wd_stop(struct mei_device *dev)
+{
+	int ret;
+
+	if (dev->wd_cl.state != MEI_FILE_CONNECTED ||
+	    dev->wd_state != MEI_WD_RUNNING)
+		return 0;
+
+	memcpy(dev->wd_data, mei_stop_wd_params, MEI_WD_STOP_MSG_SIZE);
+
+	dev->wd_state = MEI_WD_STOPPING;
+
+	ret = mei_cl_flow_ctrl_creds(&dev->wd_cl);
+	if (ret < 0)
+		goto out;
+
+	if (ret && dev->hbuf_is_ready) {
+		ret = 0;
+		dev->hbuf_is_ready = false;
+
+		if (!mei_wd_send(dev)) {
+			ret = mei_cl_flow_ctrl_reduce(&dev->wd_cl);
+			if (ret)
+				goto out;
+		} else {
+			dev_err(&dev->pdev->dev, "wd: send stop failed\n");
+		}
+
+		dev->wd_pending = false;
+	} else {
+		dev->wd_pending = true;
+	}
+
+	mutex_unlock(&dev->device_lock);
+
+	ret = wait_event_interruptible_timeout(dev->wait_stop_wd,
+					dev->wd_state == MEI_WD_IDLE,
+					msecs_to_jiffies(MEI_WD_STOP_TIMEOUT));
+	mutex_lock(&dev->device_lock);
+	if (dev->wd_state == MEI_WD_IDLE) {
+		dev_dbg(&dev->pdev->dev, "wd: stop completed ret=%d.\n", ret);
+		ret = 0;
+	} else {
+		if (!ret)
+			ret = -ETIMEDOUT;
+		dev_warn(&dev->pdev->dev,
+			"wd: stop failed to complete ret=%d.\n", ret);
+	}
+
+out:
+	return ret;
+}
+
+/*
+ * mei_wd_ops_start - wd start command from the watchdog core.
+ *
+ * @wd_dev - watchdog device struct
+ *
+ * returns 0 if success, negative errno code for failure
+ */
+static int mei_wd_ops_start(struct watchdog_device *wd_dev)
+{
+	int err = -ENODEV;
+	struct mei_device *dev;
+
+	dev = watchdog_get_drvdata(wd_dev);
+	if (!dev)
+		return -ENODEV;
+
+	mutex_lock(&dev->device_lock);
+
+	if (dev->dev_state != MEI_DEV_ENABLED) {
+		dev_dbg(&dev->pdev->dev,
+			"wd: dev_state != MEI_DEV_ENABLED  dev_state = %s\n",
+			mei_dev_state_str(dev->dev_state));
+		goto end_unlock;
+	}
+
+	if (dev->wd_cl.state != MEI_FILE_CONNECTED)	{
+		dev_dbg(&dev->pdev->dev,
+			"MEI Driver is not connected to Watchdog Client\n");
+		goto end_unlock;
+	}
+
+	mei_wd_set_start_timeout(dev, dev->wd_timeout);
+
+	err = 0;
+end_unlock:
+	mutex_unlock(&dev->device_lock);
+	return err;
+}
+
+/*
+ * mei_wd_ops_stop -  wd stop command from the watchdog core.
+ *
+ * @wd_dev - watchdog device struct
+ *
+ * returns 0 if success, negative errno code for failure
+ */
+static int mei_wd_ops_stop(struct watchdog_device *wd_dev)
+{
+	struct mei_device *dev;
+
+	dev = watchdog_get_drvdata(wd_dev);
+	if (!dev)
+		return -ENODEV;
+
+	mutex_lock(&dev->device_lock);
+	mei_wd_stop(dev);
+	mutex_unlock(&dev->device_lock);
+
+	return 0;
+}
+
+/*
+ * mei_wd_ops_ping - wd ping command from the watchdog core.
+ *
+ * @wd_dev - watchdog device struct
+ *
+ * returns 0 if success, negative errno code for failure
+ */
+static int mei_wd_ops_ping(struct watchdog_device *wd_dev)
+{
+	int ret = 0;
+	struct mei_device *dev;
+
+	dev = watchdog_get_drvdata(wd_dev);
+	if (!dev)
+		return -ENODEV;
+
+	mutex_lock(&dev->device_lock);
+
+	if (dev->wd_cl.state != MEI_FILE_CONNECTED) {
+		dev_err(&dev->pdev->dev, "wd: not connected.\n");
+		ret = -ENODEV;
+		goto end;
+	}
+
+	dev->wd_state = MEI_WD_RUNNING;
+
+	/* Check if we can send the ping to HW*/
+	if (dev->hbuf_is_ready && mei_cl_flow_ctrl_creds(&dev->wd_cl) > 0) {
+
+		dev->hbuf_is_ready = false;
+		dev_dbg(&dev->pdev->dev, "wd: sending ping\n");
+
+		if (mei_wd_send(dev)) {
+			dev_err(&dev->pdev->dev, "wd: send failed.\n");
+			ret = -EIO;
+			goto end;
+		}
+
+		if (mei_cl_flow_ctrl_reduce(&dev->wd_cl)) {
+			dev_err(&dev->pdev->dev,
+				"wd: mei_cl_flow_ctrl_reduce() failed.\n");
+			ret = -EIO;
+			goto end;
+		}
+
+	} else {
+		dev->wd_pending = true;
+	}
+
+end:
+	mutex_unlock(&dev->device_lock);
+	return ret;
+}
+
+/*
+ * mei_wd_ops_set_timeout - wd set timeout command from the watchdog core.
+ *
+ * @wd_dev - watchdog device struct
+ * @timeout - timeout value to set
+ *
+ * returns 0 if success, negative errno code for failure
+ */
+static int mei_wd_ops_set_timeout(struct watchdog_device *wd_dev,
+		unsigned int timeout)
+{
+	struct mei_device *dev;
+
+	dev = watchdog_get_drvdata(wd_dev);
+	if (!dev)
+		return -ENODEV;
+
+	/* Check Timeout value */
+	if (timeout < MEI_WD_MIN_TIMEOUT || timeout > MEI_WD_MAX_TIMEOUT)
+		return -EINVAL;
+
+	mutex_lock(&dev->device_lock);
+
+	dev->wd_timeout = timeout;
+	wd_dev->timeout = timeout;
+	mei_wd_set_start_timeout(dev, dev->wd_timeout);
+
+	mutex_unlock(&dev->device_lock);
+
+	return 0;
+}
+
+/*
+ * Watchdog Device structs
+ */
+static const struct watchdog_ops wd_ops = {
+		.owner = THIS_MODULE,
+		.start = mei_wd_ops_start,
+		.stop = mei_wd_ops_stop,
+		.ping = mei_wd_ops_ping,
+		.set_timeout = mei_wd_ops_set_timeout,
+};
+static const struct watchdog_info wd_info = {
+		.identity = INTEL_AMT_WATCHDOG_ID,
+		.options = WDIOF_KEEPALIVEPING |
+			   WDIOF_SETTIMEOUT |
+			   WDIOF_ALARMONLY,
+};
+
+static struct watchdog_device amt_wd_dev = {
+		.info = &wd_info,
+		.ops = &wd_ops,
+		.timeout = MEI_WD_DEFAULT_TIMEOUT,
+		.min_timeout = MEI_WD_MIN_TIMEOUT,
+		.max_timeout = MEI_WD_MAX_TIMEOUT,
+};
+
+
+void mei_watchdog_register(struct mei_device *dev)
+{
+	if (watchdog_register_device(&amt_wd_dev)) {
+		dev_err(&dev->pdev->dev,
+			"wd: unable to register watchdog device.\n");
+		return;
+	}
+
+	dev_dbg(&dev->pdev->dev,
+		"wd: successfully register watchdog interface.\n");
+	watchdog_set_drvdata(&amt_wd_dev, dev);
+}
+
+void mei_watchdog_unregister(struct mei_device *dev)
+{
+	if (watchdog_get_drvdata(&amt_wd_dev) == NULL)
+		return;
+
+	watchdog_set_drvdata(&amt_wd_dev, NULL);
+	watchdog_unregister_device(&amt_wd_dev);
+}
+