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/pm_runtime.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
 *
 * Locking: called under "dev->device_lock" lock
 *
 * 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;

	for (i = 0; i < dev->me_clients_num; ++i)
		if (uuid_le_cmp(*uuid,
				dev->me_clients[i].props.protocol_name) == 0)
			return i;

	return -ENOENT;
}


/**
 * 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)
			return i;

	return -ENOENT;
}


/**
 * mei_cl_cmp_id - tells if the clients are the same
 *
 * @cl1: host client 1
 * @cl2: host client 2
 *
 * returns true  - if the clients has same host and me ids
 *         false - otherwise
 */
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);
}

/**
 * mei_io_list_flush - removes cbs belonging to cl.
 *
 * @list:  an instance of our list structure
 * @cl:    host client, can be NULL for flushing the whole list
 * @free:  whether to free the cbs
 */
static void __mei_io_list_flush(struct mei_cl_cb *list,
				struct mei_cl *cl, bool free)
{
	struct mei_cl_cb *cb;
	struct mei_cl_cb *next;

	/* enable removing everything if no cl is specified */
	list_for_each_entry_safe(cb, next, &list->list, list) {
		if (!cl || (cb->cl && mei_cl_cmp_id(cl, cb->cl))) {
			list_del(&cb->list);
			if (free)
				mei_io_cb_free(cb);
		}
	}
}

/**
 * mei_io_list_flush - removes list entry belonging to cl.
 *
 * @list:  An instance of our list structure
 * @cl: host client
 */
static inline void mei_io_list_flush(struct mei_cl_cb *list, struct mei_cl *cl)
{
	__mei_io_list_flush(list, cl, false);
}


/**
 * mei_io_list_free - removes cb belonging to cl and free them
 *
 * @list:  An instance of our list structure
 * @cl: host client
 */
static inline void mei_io_list_free(struct mei_cl_cb *list, struct mei_cl *cl)
{
	__mei_io_list_flush(list, cl, true);
}

/**
 * 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