367 lines
8.5 KiB
C
367 lines
8.5 KiB
C
/*
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*
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* Intel Management Engine Interface (Intel MEI) Linux driver
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* Copyright (c) 2003-2012, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/fcntl.h>
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#include <linux/aio.h>
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <linux/ioctl.h>
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#include <linux/cdev.h>
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#include <linux/list.h>
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#include <linux/delay.h>
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#include <linux/sched.h>
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#include <linux/uuid.h>
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#include <linux/jiffies.h>
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#include <linux/uaccess.h>
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#include "mei_dev.h"
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#include "hw.h"
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#include <linux/mei.h>
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#include "interface.h"
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/**
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* mei_io_cb_free - free mei_cb_private related memory
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*
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* @cb: mei callback struct
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*/
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void mei_io_cb_free(struct mei_cl_cb *cb)
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{
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if (cb == NULL)
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return;
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kfree(cb->request_buffer.data);
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kfree(cb->response_buffer.data);
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kfree(cb);
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}
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/**
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* mei_io_cb_init - allocate and initialize io callback
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*
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* @cl - mei client
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* @file: pointer to file structure
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*
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* returns mei_cl_cb pointer or NULL;
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*/
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struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl, struct file *fp)
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{
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struct mei_cl_cb *cb;
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cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
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if (!cb)
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return NULL;
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mei_io_list_init(cb);
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cb->file_object = fp;
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cb->cl = cl;
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cb->buf_idx = 0;
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return cb;
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}
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/**
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* mei_io_cb_alloc_req_buf - allocate request buffer
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*
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* @cb - io callback structure
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* @size: size of the buffer
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*
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* returns 0 on success
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* -EINVAL if cb is NULL
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* -ENOMEM if allocation failed
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*/
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int mei_io_cb_alloc_req_buf(struct mei_cl_cb *cb, size_t length)
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{
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if (!cb)
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return -EINVAL;
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if (length == 0)
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return 0;
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cb->request_buffer.data = kmalloc(length, GFP_KERNEL);
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if (!cb->request_buffer.data)
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return -ENOMEM;
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cb->request_buffer.size = length;
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return 0;
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}
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/**
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* mei_io_cb_alloc_req_buf - allocate respose buffer
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*
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* @cb - io callback structure
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* @size: size of the buffer
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*
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* returns 0 on success
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* -EINVAL if cb is NULL
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* -ENOMEM if allocation failed
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*/
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int mei_io_cb_alloc_resp_buf(struct mei_cl_cb *cb, size_t length)
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{
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if (!cb)
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return -EINVAL;
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if (length == 0)
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return 0;
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cb->response_buffer.data = kmalloc(length, GFP_KERNEL);
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if (!cb->response_buffer.data)
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return -ENOMEM;
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cb->response_buffer.size = length;
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return 0;
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}
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/**
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* mei_me_cl_by_id return index to me_clients for client_id
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*
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* @dev: the device structure
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* @client_id: me client id
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*
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* Locking: called under "dev->device_lock" lock
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*
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* returns index on success, -ENOENT on failure.
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*/
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int mei_me_cl_by_id(struct mei_device *dev, u8 client_id)
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{
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int i;
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for (i = 0; i < dev->me_clients_num; i++)
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if (dev->me_clients[i].client_id == client_id)
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break;
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if (WARN_ON(dev->me_clients[i].client_id != client_id))
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return -ENOENT;
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if (i == dev->me_clients_num)
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return -ENOENT;
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return i;
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}
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/**
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* mei_ioctl_connect_client - the connect to fw client IOCTL function
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*
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* @dev: the device structure
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* @data: IOCTL connect data, input and output parameters
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* @file: private data of the file object
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*
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* Locking: called under "dev->device_lock" lock
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*
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* returns 0 on success, <0 on failure.
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*/
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int mei_ioctl_connect_client(struct file *file,
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struct mei_connect_client_data *data)
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{
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struct mei_device *dev;
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struct mei_cl_cb *cb;
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struct mei_client *client;
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struct mei_cl *cl;
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long timeout = mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT);
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int i;
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int err;
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int rets;
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cl = file->private_data;
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if (WARN_ON(!cl || !cl->dev))
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return -ENODEV;
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dev = cl->dev;
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dev_dbg(&dev->pdev->dev, "mei_ioctl_connect_client() Entry\n");
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/* buffered ioctl cb */
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cb = mei_io_cb_init(cl, file);
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if (!cb) {
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rets = -ENOMEM;
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goto end;
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}
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cb->fop_type = MEI_FOP_IOCTL;
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if (dev->dev_state != MEI_DEV_ENABLED) {
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rets = -ENODEV;
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goto end;
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}
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if (cl->state != MEI_FILE_INITIALIZING &&
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cl->state != MEI_FILE_DISCONNECTED) {
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rets = -EBUSY;
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goto end;
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}
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/* find ME client we're trying to connect to */
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i = mei_me_cl_by_uuid(dev, &data->in_client_uuid);
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if (i >= 0 && !dev->me_clients[i].props.fixed_address) {
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cl->me_client_id = dev->me_clients[i].client_id;
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cl->state = MEI_FILE_CONNECTING;
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}
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dev_dbg(&dev->pdev->dev, "Connect to FW Client ID = %d\n",
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cl->me_client_id);
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dev_dbg(&dev->pdev->dev, "FW Client - Protocol Version = %d\n",
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dev->me_clients[i].props.protocol_version);
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dev_dbg(&dev->pdev->dev, "FW Client - Max Msg Len = %d\n",
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dev->me_clients[i].props.max_msg_length);
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/* if we're connecting to amthi client then we will use the
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* existing connection
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*/
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if (uuid_le_cmp(data->in_client_uuid, mei_amthi_guid) == 0) {
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dev_dbg(&dev->pdev->dev, "FW Client is amthi\n");
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if (dev->iamthif_cl.state != MEI_FILE_CONNECTED) {
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rets = -ENODEV;
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goto end;
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}
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clear_bit(cl->host_client_id, dev->host_clients_map);
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mei_me_cl_unlink(dev, cl);
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kfree(cl);
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cl = NULL;
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file->private_data = &dev->iamthif_cl;
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client = &data->out_client_properties;
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client->max_msg_length =
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dev->me_clients[i].props.max_msg_length;
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client->protocol_version =
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dev->me_clients[i].props.protocol_version;
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rets = dev->iamthif_cl.status;
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goto end;
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}
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if (cl->state != MEI_FILE_CONNECTING) {
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rets = -ENODEV;
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goto end;
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}
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/* prepare the output buffer */
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client = &data->out_client_properties;
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client->max_msg_length = dev->me_clients[i].props.max_msg_length;
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client->protocol_version = dev->me_clients[i].props.protocol_version;
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dev_dbg(&dev->pdev->dev, "Can connect?\n");
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if (dev->mei_host_buffer_is_empty
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&& !mei_other_client_is_connecting(dev, cl)) {
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dev_dbg(&dev->pdev->dev, "Sending Connect Message\n");
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dev->mei_host_buffer_is_empty = false;
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if (mei_connect(dev, cl)) {
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dev_dbg(&dev->pdev->dev, "Sending connect message - failed\n");
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rets = -ENODEV;
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goto end;
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} else {
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dev_dbg(&dev->pdev->dev, "Sending connect message - succeeded\n");
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cl->timer_count = MEI_CONNECT_TIMEOUT;
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list_add_tail(&cb->list, &dev->ctrl_rd_list.list);
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}
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} else {
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dev_dbg(&dev->pdev->dev, "Queuing the connect request due to device busy\n");
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dev_dbg(&dev->pdev->dev, "add connect cb to control write list.\n");
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list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
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}
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mutex_unlock(&dev->device_lock);
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err = wait_event_timeout(dev->wait_recvd_msg,
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(MEI_FILE_CONNECTED == cl->state ||
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MEI_FILE_DISCONNECTED == cl->state), timeout);
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mutex_lock(&dev->device_lock);
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if (MEI_FILE_CONNECTED == cl->state) {
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dev_dbg(&dev->pdev->dev, "successfully connected to FW client.\n");
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rets = cl->status;
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goto end;
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} else {
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dev_dbg(&dev->pdev->dev, "failed to connect to FW client.cl->state = %d.\n",
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cl->state);
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if (!err) {
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dev_dbg(&dev->pdev->dev,
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"wait_event_interruptible_timeout failed on client"
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" connect message fw response message.\n");
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}
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rets = -EFAULT;
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mei_io_list_flush(&dev->ctrl_rd_list, cl);
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mei_io_list_flush(&dev->ctrl_wr_list, cl);
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goto end;
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}
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rets = 0;
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end:
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dev_dbg(&dev->pdev->dev, "free connect cb memory.");
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mei_io_cb_free(cb);
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return rets;
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}
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/**
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* mei_start_read - the start read client message function.
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*
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* @dev: the device structure
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* @if_num: minor number
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* @cl: private data of the file object
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*
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* returns 0 on success, <0 on failure.
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*/
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int mei_start_read(struct mei_device *dev, struct mei_cl *cl)
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{
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struct mei_cl_cb *cb;
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int rets;
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int i;
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if (cl->state != MEI_FILE_CONNECTED)
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return -ENODEV;
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if (dev->dev_state != MEI_DEV_ENABLED)
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return -ENODEV;
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if (cl->read_pending || cl->read_cb) {
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dev_dbg(&dev->pdev->dev, "read is pending.\n");
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return -EBUSY;
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}
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i = mei_me_cl_by_id(dev, cl->me_client_id);
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if (i < 0) {
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dev_err(&dev->pdev->dev, "no such me client %d\n",
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cl->me_client_id);
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return -ENODEV;
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}
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cb = mei_io_cb_init(cl, NULL);
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if (!cb)
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return -ENOMEM;
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rets = mei_io_cb_alloc_resp_buf(cb,
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dev->me_clients[i].props.max_msg_length);
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if (rets)
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goto err;
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cb->fop_type = MEI_FOP_READ;
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cl->read_cb = cb;
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if (dev->mei_host_buffer_is_empty) {
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dev->mei_host_buffer_is_empty = false;
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if (mei_send_flow_control(dev, cl)) {
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rets = -ENODEV;
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goto err;
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}
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list_add_tail(&cb->list, &dev->read_list.list);
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} else {
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list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
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}
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return rets;
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err:
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mei_io_cb_free(cb);
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return rets;
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}
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