Initial import

1 files changed, 606 insertions, 0 deletions

diff --git a/drivers/misc/mei/amthif.c b/drivers/misc/mei/amthif.c
new file mode 100644
index 000000000..d2cd53e3f
--- /dev/null
+++ b/drivers/misc/mei/amthif.c
@@ -0,0 +1,606 @@
+/*
+ *
+ * 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/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/slab.h>
+
+#include <linux/mei.h>
+
+#include "mei_dev.h"
+#include "hbm.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_canceled = false;
+	dev->iamthif_state = MEI_IAMTHIF_IDLE;
+	dev->iamthif_timer = 0;
+	dev->iamthif_stall_timer = 0;
+	dev->iamthif_open_count = 0;
+}
+
+/**
+ * mei_amthif_host_init - mei initialization amthif client.
+ *
+ * @dev: the device structure
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+int mei_amthif_host_init(struct mei_device *dev)
+{
+	struct mei_cl *cl = &dev->iamthif_cl;
+	struct mei_me_client *me_cl;
+	int ret;
+
+	dev->iamthif_state = MEI_IAMTHIF_IDLE;
+
+	mei_cl_init(cl, dev);
+
+	me_cl = mei_me_cl_by_uuid(dev, &mei_amthif_guid);
+	if (!me_cl) {
+		dev_info(dev->dev, "amthif: failed to find the client");
+		return -ENOTTY;
+	}
+
+	cl->me_client_id = me_cl->client_id;
+	cl->cl_uuid = me_cl->props.protocol_name;
+
+	/* Assign iamthif_mtu to the value received from ME  */
+
+	dev->iamthif_mtu = me_cl->props.max_msg_length;
+	dev_dbg(dev->dev, "IAMTHIF_MTU = %d\n", dev->iamthif_mtu);
+
+
+	ret = mei_cl_link(cl, MEI_IAMTHIF_HOST_CLIENT_ID);
+	if (ret < 0) {
+		dev_err(dev->dev, "amthif: failed cl_link %d\n", ret);
+		goto out;
+	}
+
+	ret = mei_cl_connect(cl, NULL);
+
+	dev->iamthif_state = MEI_IAMTHIF_IDLE;
+
+out:
+	mei_me_cl_put(me_cl);
+	return ret;
+}
+
+/**
+ * mei_amthif_find_read_list_entry - finds a amthilist entry for current file
+ *
+ * @dev: the device structure
+ * @file: pointer to file object
+ *
+ * Return:   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 *cb;
+
+	list_for_each_entry(cb, &dev->amthif_rd_complete_list.list, list)
+		if (cb->file_object == file)
+			return cb;
+	return NULL;
+}
+
+
+/**
+ * mei_amthif_read - read data from AMTHIF client
+ *
+ * @dev: the device structure
+ * @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
+ *
+ * Return:
+ *  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)
+{
+	struct mei_cl *cl = file->private_data;
+	struct mei_cl_cb *cb;
+	unsigned long timeout;
+	int rets;
+	int wait_ret;
+
+	/* Only possible if we are in timeout */
+	if (!cl) {
+		dev_err(dev->dev, "bad file ext.\n");
+		return -ETIME;
+	}
+
+	dev_dbg(dev->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->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->dev, "woke up from sleep\n");
+	}
+
+	if (cb->status) {
+		rets = cb->status;
+		dev_dbg(dev->dev, "read operation failed %d\n", rets);
+		goto free;
+	}
+
+	dev_dbg(dev->dev, "Got amthif data\n");
+	dev->iamthif_timer = 0;
+
+	timeout = cb->read_time +
+		mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER);
+	dev_dbg(dev->dev, "amthif timeout = %lud\n",
+			timeout);
+
+	if  (time_after(jiffies, timeout)) {
+		dev_dbg(dev->dev, "amthif Time out\n");
+		/* 15 sec for the message has expired */
+		list_del_init(&cb->list);
+		rets = -ETIME;
+		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_init(&cb->list);
+	else if (cb->buf_idx > 0 && cb->buf_idx <= *offset) {
+		/* end of the message has been reached */
+		list_del_init(&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->dev, "amthif cb->buf size - %d\n",
+	    cb->buf.size);
+	dev_dbg(dev->dev, "amthif cb->buf_idx - %lu\n", cb->buf_idx);
+
+	/* length is being truncated 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->buf.data + *offset, length)) {
+		dev_dbg(dev->dev, "failed to copy data to userland\n");
+		rets = -EFAULT;
+	} else {
+		rets = length;
+		if ((*offset + length) < cb->buf_idx) {
+			*offset += length;
+			goto out;
+		}
+	}
+free:
+	dev_dbg(dev->dev, "free amthif cb memory.\n");
+	*offset = 0;
+	mei_io_cb_free(cb);
+out:
+	return rets;
+}
+
+/**
+ * mei_amthif_read_start - queue message for sending read credential
+ *
+ * @cl: host client
+ * @file: file pointer of message recipient
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+static int mei_amthif_read_start(struct mei_cl *cl, struct file *file)
+{
+	struct mei_device *dev = cl->dev;
+	struct mei_cl_cb *cb;
+	size_t length = dev->iamthif_mtu;
+	int rets;
+
+	cb = mei_io_cb_init(cl, MEI_FOP_READ, file);
+	if (!cb) {
+		rets = -ENOMEM;
+		goto err;
+	}
+
+	rets = mei_io_cb_alloc_buf(cb, length);
+	if (rets)
+		goto err;
+
+	list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
+
+	dev->iamthif_state = MEI_IAMTHIF_READING;
+	dev->iamthif_file_object = cb->file_object;
+	dev->iamthif_current_cb = cb;
+
+	return 0;
+err:
+	mei_io_cb_free(cb);
+	return rets;
+}
+
+/**
+ * mei_amthif_send_cmd - send amthif command to the ME
+ *
+ * @cl: the host client
+ * @cb: mei call back struct
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+static int mei_amthif_send_cmd(struct mei_cl *cl, struct mei_cl_cb *cb)
+{
+	struct mei_device *dev;
+	int ret;
+
+	if (!cl->dev || !cb)
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	dev->iamthif_state = MEI_IAMTHIF_WRITING;
+	dev->iamthif_current_cb = cb;
+	dev->iamthif_file_object = cb->file_object;
+	dev->iamthif_canceled = false;
+
+	ret = mei_cl_write(cl, cb, false);
+	if (ret < 0)
+		return ret;
+
+	if (cb->completed)
+		cb->status = mei_amthif_read_start(cl, cb->file_object);
+
+	return 0;
+}
+
+/**
+ * mei_amthif_run_next_cmd - send next amt command from queue
+ *
+ * @dev: the device structure
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+int mei_amthif_run_next_cmd(struct mei_device *dev)
+{
+	struct mei_cl *cl = &dev->iamthif_cl;
+	struct mei_cl_cb *cb;
+
+	dev->iamthif_canceled = false;
+	dev->iamthif_state = MEI_IAMTHIF_IDLE;
+	dev->iamthif_timer = 0;
+	dev->iamthif_file_object = NULL;
+
+	dev_dbg(dev->dev, "complete amthif cmd_list cb.\n");
+
+	cb = list_first_entry_or_null(&dev->amthif_cmd_list.list,
+					typeof(*cb), list);
+	if (!cb)
+		return 0;
+
+	list_del_init(&cb->list);
+	return mei_amthif_send_cmd(cl, cb);
+}
+
+/**
+ * mei_amthif_write - write amthif data to amthif client
+ *
+ * @cl: host client
+ * @cb: mei call back struct
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+int mei_amthif_write(struct mei_cl *cl, struct mei_cl_cb *cb)
+{
+
+	struct mei_device *dev;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	if (WARN_ON(!cb))
+		return -EINVAL;
+
+	dev = cl->dev;
+
+	list_add_tail(&cb->list, &dev->amthif_cmd_list.list);
+	return mei_amthif_run_next_cmd(dev);
+}
+
+/**
+ * mei_amthif_poll - the amthif poll function
+ *
+ * @dev: the device structure
+ * @file: pointer to file structure
+ * @wait: pointer to poll_table structure
+ *
+ * Return: poll mask
+ *
+ * Locking: called under "dev->device_lock" lock
+ */
+
+unsigned int mei_amthif_poll(struct mei_device *dev,
+		struct file *file, poll_table *wait)
+{
+	unsigned int mask = 0;
+
+	poll_wait(file, &dev->iamthif_cl.wait, wait);
+
+	if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE &&
+	    dev->iamthif_file_object == file) {
+
+		mask |= POLLIN | POLLRDNORM;
+		mei_amthif_run_next_cmd(dev);
+	}
+
+	return mask;
+}
+
+
+
+/**
+ * mei_amthif_irq_write - write iamthif command in irq thread context.
+ *
+ * @cl: private data of the file object.
+ * @cb: callback block.
+ * @cmpl_list: complete list.
+ *
+ * Return: 0, OK; otherwise, error.
+ */
+int mei_amthif_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
+			 struct mei_cl_cb *cmpl_list)
+{
+	int ret;
+
+	ret = mei_cl_irq_write(cl, cb, cmpl_list);
+	if (ret)
+		return ret;
+
+	if (cb->completed)
+		cb->status = mei_amthif_read_start(cl, cb->file_object);
+
+	return 0;
+}
+
+/**
+ * mei_amthif_irq_read_msg - read routine after ISR to
+ *			handle the read amthif message
+ *
+ * @cl: mei client
+ * @mei_hdr: header of amthif message
+ * @cmpl_list: completed callbacks list
+ *
+ * Return: -ENODEV if cb is NULL 0 otherwise; error message is in cb->status
+ */
+int mei_amthif_irq_read_msg(struct mei_cl *cl,
+			    struct mei_msg_hdr *mei_hdr,
+			    struct mei_cl_cb *cmpl_list)
+{
+	struct mei_device *dev;
+	int ret;
+
+	dev = cl->dev;
+
+	if (dev->iamthif_state != MEI_IAMTHIF_READING)
+		return 0;
+
+	ret = mei_cl_irq_read_msg(cl, mei_hdr, cmpl_list);
+	if (ret)
+		return ret;
+
+	if (!mei_hdr->msg_complete)
+		return 0;
+
+	dev_dbg(dev->dev, "completed amthif read.\n ");
+	dev->iamthif_current_cb = NULL;
+	dev->iamthif_stall_timer = 0;
+
+	return 0;
+}
+
+/**
+ * mei_amthif_complete - complete amthif callback.
+ *
+ * @dev: the device structure.
+ * @cb: callback block.
+ */
+void mei_amthif_complete(struct mei_device *dev, struct mei_cl_cb *cb)
+{
+
+	if (cb->fop_type == MEI_FOP_WRITE) {
+		if (!cb->status) {
+			dev->iamthif_stall_timer = MEI_IAMTHIF_STALL_TIMER;
+			mei_io_cb_free(cb);
+			return;
+		}
+		/*
+		 * in case of error enqueue the write cb to complete read list
+		 * so it can be propagated to the reader
+		 */
+		list_add_tail(&cb->list, &dev->amthif_rd_complete_list.list);
+		wake_up_interruptible(&dev->iamthif_cl.wait);
+		return;
+	}
+
+	if (dev->iamthif_canceled != 1) {
+		dev->iamthif_state = MEI_IAMTHIF_READ_COMPLETE;
+		dev->iamthif_stall_timer = 0;
+		list_add_tail(&cb->list, &dev->amthif_rd_complete_list.list);
+		dev_dbg(dev->dev, "amthif read completed\n");
+		dev->iamthif_timer = jiffies;
+		dev_dbg(dev->dev, "dev->iamthif_timer = %ld\n",
+			dev->iamthif_timer);
+	} else {
+		mei_amthif_run_next_cmd(dev);
+	}
+
+	dev_dbg(dev->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
+ *
+ * Return: 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 *cl = &dev->iamthif_cl;
+	struct mei_cl_cb *cb, *next;
+	bool removed = false;
+
+	/* list all list member */
+	list_for_each_entry_safe(cb, next, mei_cb_list, list) {
+		/* check if list member associated with a file */
+		if (file == cb->file_object) {
+			/* check if cb equal to current iamthif cb */
+			if (dev->iamthif_current_cb == cb) {
+				dev->iamthif_current_cb = NULL;
+				/* send flow control to iamthif client */
+				mei_hbm_cl_flow_control_req(dev, cl);
+			}
+			/* free all allocated buffers */
+			mei_io_cb_free(cb);
+			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
+ *
+ * Return: 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
+*
+*  Return: 0 on success, <0 on error
+*/
+int mei_amthif_release(struct mei_device *dev, struct file *file)
+{
+	if (dev->iamthif_open_count > 0)
+		dev->iamthif_open_count--;
+
+	if (dev->iamthif_file_object == file &&
+	    dev->iamthif_state != MEI_IAMTHIF_IDLE) {
+
+		dev_dbg(dev->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->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;
+}