linux/drivers/misc/mei/iorw.c

367 lines
8.5 KiB
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/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 "mei_dev.h"
#include "hw.h"
#include <linux/mei.h>
#include "interface.h"
/**
* 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
* @file: 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
* @size: 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_req_buf - allocate respose buffer
*
* @cb - io callback structure
* @size: 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_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_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.
*/
int mei_ioctl_connect_client(struct file *file,
struct mei_connect_client_data *data)
{
struct mei_device *dev;
struct mei_cl_cb *cb;
struct mei_client *client;
struct mei_cl *cl;
long timeout = mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT);
int i;
int err;
int rets;
cl = file->private_data;
if (WARN_ON(!cl || !cl->dev))
return -ENODEV;
dev = cl->dev;
dev_dbg(&dev->pdev->dev, "mei_ioctl_connect_client() Entry\n");
/* buffered ioctl cb */
cb = mei_io_cb_init(cl, file);
if (!cb) {
rets = -ENOMEM;
goto end;
}
cb->fop_type = MEI_FOP_IOCTL;
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) {
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 amthi client then we will use the
* existing connection
*/
if (uuid_le_cmp(data->in_client_uuid, mei_amthi_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_me_cl_unlink(dev, 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;
}
if (cl->state != MEI_FILE_CONNECTING) {
rets = -ENODEV;
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");
if (dev->mei_host_buffer_is_empty
&& !mei_other_client_is_connecting(dev, cl)) {
dev_dbg(&dev->pdev->dev, "Sending Connect Message\n");
dev->mei_host_buffer_is_empty = false;
if (mei_connect(dev, cl)) {
dev_dbg(&dev->pdev->dev, "Sending connect message - failed\n");
rets = -ENODEV;
goto end;
} else {
dev_dbg(&dev->pdev->dev, "Sending connect message - succeeded\n");
cl->timer_count = MEI_CONNECT_TIMEOUT;
list_add_tail(&cb->list, &dev->ctrl_rd_list.list);
}
} else {
dev_dbg(&dev->pdev->dev, "Queuing the connect request due to device busy\n");
dev_dbg(&dev->pdev->dev, "add connect 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_CONNECTED == cl->state ||
MEI_FILE_DISCONNECTED == cl->state), timeout);
mutex_lock(&dev->device_lock);
if (MEI_FILE_CONNECTED == cl->state) {
dev_dbg(&dev->pdev->dev, "successfully connected to FW client.\n");
rets = cl->status;
goto end;
} else {
dev_dbg(&dev->pdev->dev, "failed to connect to FW client.cl->state = %d.\n",
cl->state);
if (!err) {
dev_dbg(&dev->pdev->dev,
"wait_event_interruptible_timeout failed on client"
" connect message fw response message.\n");
}
rets = -EFAULT;
mei_io_list_flush(&dev->ctrl_rd_list, cl);
mei_io_list_flush(&dev->ctrl_wr_list, cl);
goto end;
}
rets = 0;
end:
dev_dbg(&dev->pdev->dev, "free connect cb memory.");
mei_io_cb_free(cb);
return rets;
}
/**
* mei_start_read - the start read client message function.
*
* @dev: the device structure
* @if_num: minor number
* @cl: private data of the file object
*
* returns 0 on success, <0 on failure.
*/
int mei_start_read(struct mei_device *dev, struct mei_cl *cl)
{
struct mei_cl_cb *cb;
int rets;
int i;
if (cl->state != MEI_FILE_CONNECTED)
return -ENODEV;
if (dev->dev_state != MEI_DEV_ENABLED)
return -ENODEV;
if (cl->read_pending || 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;
rets = mei_io_cb_alloc_resp_buf(cb,
dev->me_clients[i].props.max_msg_length);
if (rets)
goto err;
cb->fop_type = MEI_FOP_READ;
cl->read_cb = cb;
if (dev->mei_host_buffer_is_empty) {
dev->mei_host_buffer_is_empty = false;
if (mei_send_flow_control(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;
}