path: root/drivers/misc/mei/client.c

/*
 *
 * 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,