- 根目录:
- drivers
- staging
- mei
- iorw.c
/*
*
* Intel Management Engine Interface (Intel MEI) Linux driver
* Copyright (c) 2003-2011, 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 "mei.h"
#include "interface.h"
#include "mei_version.h"
/**
* 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;
struct mei_cl *cl_pos = NULL;
struct mei_cl *cl_next = NULL;
long timeout = 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 = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
if (!cb) {
rets = -ENOMEM;
goto end;
}
INIT_LIST_HEAD(&cb->cb_list);
cb->major_file_operations = MEI_IOCTL;
if (dev->mei_state != MEI_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_find_me_client_index(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 so we will use the exist
* 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);
list_for_each_entry_safe(cl_pos, cl_next,
&dev->file_list, link) {
if (mei_fe_same_id(cl, cl_pos)) {
dev_dbg(&dev->pdev->dev,
"remove file private data node host"
" client = %d, ME client = %d.\n",
cl_pos->host_client_id,
cl_pos->me_client_id);
list_del(&cl_pos->link);
}
}
dev_dbg(&dev->pdev->dev, "free file private data memory.\n");
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 = 0;
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;
cb->file_private = cl;
list_add_tail(&cb->cb_list,
&dev->ctrl_rd_list.mei_cb.
cb_list);
}
} else {
dev_dbg(&dev->pdev->dev, "Queuing the connect request due to device busy\n");
cb->file_private = cl;
dev_dbg(&dev->pdev->dev, "add connect cb to control write list.\n");
list_add_tail(&cb->cb_list,
&dev->ctrl_wr_list.mei_cb.cb_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 * HZ);
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_flush_list(&dev->ctrl_rd_list, cl);
mei_flush_list(&dev->ctrl_wr_list, cl);
goto end;
}
rets = 0;
end:
dev_dbg(&dev->pdev->dev, "free connect cb memory.");
kfree(cb);
return rets;
}
/**
* find_amthi_read_list_entry - finds a amthilist entry for current file
*
* @dev: the device structure
* @file: pointer to file object
*
* returns returned a list entry on success, NULL on failure.
*/
struct mei_cl_cb *find_amthi_read_list_entry(
struct mei_device *dev,
struct file *file)
{
struct mei_cl *cl_temp;
struct mei_cl_cb *cb_pos = NULL;
struct mei_cl_cb *cb_next = NULL;
if (!dev->amthi_read_complete_list.status &&
!list_empty(&dev->amthi_read_complete_list.mei_cb.cb_list)) {
list_for_each_entry_safe(cb_pos, cb_next,
&dev->amthi_read_complete_list.mei_cb.cb_list, cb_list) {
cl_temp = (struct mei_cl *)cb_pos->file_private;
if (cl_temp && cl_temp == &dev->iamthif_cl &&
cb_pos->file_object == file)
return cb_pos;
}
}
return NULL;
}
/**
* amthi_read - read data from AMTHI client
*
* @dev: the device structure
* @if_num: minor number
* @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
*
* returns
* returned data length on success,
* zero if no data to read,
* negative on failure.
*/
int amthi_read(struct mei_device *dev, struct file *file,
char __user *ubuf, size_t length, loff_t *offset)
{
int rets;
int wait_ret;
struct mei_cl_cb *cb = NULL;
struct mei_cl *cl = file->private_data;
unsigned long timeout;
int i;
/* Only Posible if we are in timeout */
if (!cl || cl != &dev->iamthif_cl) {
dev_dbg(&dev->pdev->dev, "bad file ext.\n");
return -ETIMEDOUT;
}
for (i = 0; i < dev->num_mei_me_clients; i++) {
if (dev->me_clients[i].client_id ==
dev->iamthif_cl.me_client_id)
break;
}
if (i == dev->num_mei_me_clients) {
dev_dbg(&dev->pdev->dev, "amthi client not found.\n");
return -ENODEV;
}
if (WARN_ON(dev->me_clients[i].client_id != cl->me_client_id))
return -ENODEV;
dev_dbg(&dev->pdev->dev, "checking amthi data\n");
cb = find_amthi_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->pdev->dev, "waiting for amthi data\n");
while (cb == NULL) {
/* unlock the Mutex */
mutex_unlock(&dev->device_lock);
wait_ret = wait_event_interruptible(dev->iamthif_cl.wait,
(cb = find_amthi_read_list_entry(dev, file)));
if (wait_ret)
return -ERESTARTSYS;
dev_dbg(&dev->pdev->dev, "woke up from sleep\n");
/* Locking again the Mutex */
mutex_lock(&dev->device_lock);
}
dev_dbg(&dev->pdev->dev, "Got amthi data\n");
dev->iamthif_timer = 0;
if (cb) {
timeout = cb->read_time +
msecs_to_jiffies(IAMTHIF_READ_TIMER);
dev_dbg(&dev->pdev->dev, "amthi timeout = %lud\n",
timeout);
if (time_after(jiffies, timeout)) {
dev_dbg(&dev->pdev->dev, "amthi Time out\n");
/* 15 sec for the message has expired */
list_del(&cb->cb_list);
rets = -ETIMEDOUT;
goto free;
}
}
/* if the whole message will fit remove it from the list */
if (cb->information >= *offset &&
length >= (cb->information - *offset))
list_del(&cb->cb_list);
else if (cb->information > 0 && cb->information <= *offset) {
/* end of the message has been reached */
list_del(&cb->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->pdev->dev, "amthi cb->response_buffer size - %d\n",
cb->response_buffer.size);
dev_dbg(&dev->pdev->dev, "amthi cb->information - %lu\n",
cb->information);
/* length is being turncated to PAGE_SIZE, however,
* the information may be longer */
length = min_t(size_t, length, (cb->information - *offset));
if (copy_to_user(ubuf,
cb->response_buffer.data + *offset,
length))
rets = -EFAULT;
else {
rets = length;
if ((*offset + length) < cb->information) {
*offset += length;
goto out;
}
}
free:
dev_dbg(&dev->pdev->dev, "free amthi cb memory.\n");
*offset = 0;
mei_free_cb_private(cb);
out:
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 = 0;
int i;
if (cl->state != MEI_FILE_CONNECTED)
return -ENODEV;
if (dev->mei_state != MEI_ENABLED)
return -ENODEV;
dev_dbg(&dev->pdev->dev, "check if read is pending.\n");
if (cl->read_pending || cl->read_cb) {
dev_dbg(&dev->pdev->dev, "read is pending.\n");
return -EBUSY;
}
cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
if (!cb)
return -ENOMEM;
dev_dbg(&dev->pdev->dev, "allocation call back successful. host client = %d, ME client = %d\n",
cl->host_client_id, cl->me_client_id);
for (i = 0; i < dev->num_mei_me_clients; i++) {
if (dev->me_clients[i].client_id == cl->me_client_id)
break;
}
if (WARN_ON(dev->me_clients[i].client_id != cl->me_client_id)) {
rets = -ENODEV;
goto unlock;
}
if (i == dev->num_mei_me_clients) {
rets = -ENODEV;
goto unlock;
}
cb->response_buffer.size = dev->me_clients[i].props.max_msg_length;
cb->response_buffer.data =
kmalloc(cb->response_buffer.size, GFP_KERNEL);
if (!cb->response_buffer.data) {
rets = -ENOMEM;
goto unlock;
}
dev_dbg(&dev->pdev->dev, "allocation call back data success.\n");
cb->major_file_operations = MEI_READ;
/* make sure information is zero before we start */
cb->information = 0;
cb->file_private = (void *) cl;
cl->read_cb = cb;
if (dev->mei_host_buffer_is_empty) {
dev->mei_host_buffer_is_empty = 0;
if (!mei_send_flow_control(dev, cl)) {
rets = -ENODEV;
goto unlock;
} else {
list_add_tail(&cb->cb_list,
&dev->read_list.mei_cb.cb_list);
}
} else {
list_add_tail(&cb->cb_list,
&dev->ctrl_wr_list.mei_cb.cb_list);
}
return rets;
unlock:
mei_free_cb_private(cb);
return rets;
}
/**
* amthi_write - write iamthif data to amthi client
*
* @dev: the device structure
* @cb: mei call back struct
*
* returns 0 on success, <0 on failure.
*/
int amthi_write(struct mei_device *dev, struct mei_cl_cb *cb)
{
struct mei_msg_hdr mei_hdr;
int ret;
if (!dev || !cb)
return -ENODEV;
dev_dbg(&dev->pdev->dev, "write data to amthi client.\n");
dev->iamthif_state = MEI_IAMTHIF_WRITING;
dev->iamthif_current_cb = cb;
dev->iamthif_file_object = cb->file_object;
dev->iamthif_canceled = 0;
dev->iamthif_ioctl = 1;
dev->iamthif_msg_buf_size = cb->request_buffer.size;
memcpy(dev->iamthif_msg_buf, cb->request_buffer.data,
cb->request_buffer.size);
ret = mei_flow_ctrl_creds(dev, &dev->iamthif_cl);
if (ret < 0)
return ret;
if (ret && dev->mei_host_buffer_is_empty) {
ret = 0;
dev->mei_host_buffer_is_empty = 0;
if (cb->request_buffer.size >
(((dev->host_hw_state & H_CBD) >> 24) * sizeof(u32))
-sizeof(struct mei_msg_hdr)) {
mei_hdr.length =
(((dev->host_hw_state & H_CBD) >> 24) *
sizeof(u32)) - sizeof(struct mei_msg_hdr);
mei_hdr.msg_complete = 0;
} else {
mei_hdr.length = cb->request_buffer.size;
mei_hdr.msg_complete = 1;
}
mei_hdr.host_addr = dev->iamthif_cl.host_client_id;
mei_hdr.me_addr = dev->iamthif_cl.me_client_id;
mei_hdr.reserved = 0;
dev->iamthif_msg_buf_index += mei_hdr.length;
if (!mei_write_message(dev, &mei_hdr,
(unsigned char *)(dev->iamthif_msg_buf),
mei_hdr.length))
return -ENODEV;
if (mei_hdr.msg_complete) {
if (mei_flow_ctrl_reduce(dev, &dev->iamthif_cl))
return -ENODEV;
dev->iamthif_flow_control_pending = 1;
dev->iamthif_state = MEI_IAMTHIF_FLOW_CONTROL;
dev_dbg(&dev->pdev->dev, "add amthi cb to write waiting list\n");
dev->iamthif_current_cb = cb;
dev->iamthif_file_object = cb->file_object;
list_add_tail(&cb->cb_list,
&dev->write_waiting_list.mei_cb.cb_list);
} else {
dev_dbg(&dev->pdev->dev, "message does not complete, "
"so add amthi cb to write list.\n");
list_add_tail(&cb->cb_list,
&dev->write_list.mei_cb.cb_list);
}
} else {
if (!(dev->mei_host_buffer_is_empty))
dev_dbg(&dev->pdev->dev, "host buffer is not empty");
dev_dbg(&dev->pdev->dev, "No flow control credentials, "
"so add iamthif cb to write list.\n");
list_add_tail(&cb->cb_list,
&dev->write_list.mei_cb.cb_list);
}
return 0;
}
/**
* iamthif_ioctl_send_msg - send cmd data to amthi client
*
* @dev: the device structure
*
* returns 0 on success, <0 on failure.
*/
void run_next_iamthif_cmd(struct mei_device *dev)
{
struct mei_cl *cl_tmp;
struct mei_cl_cb *cb_pos = NULL;
struct mei_cl_cb *cb_next = NULL;
int status;
if (!dev)
return;
dev->iamthif_msg_buf_size = 0;
dev->iamthif_msg_buf_index = 0;
dev->iamthif_canceled = 0;
dev->iamthif_ioctl = 1;
dev->iamthif_state = MEI_IAMTHIF_IDLE;
dev->iamthif_timer = 0;
dev->iamthif_file_object = NULL;
if (dev->amthi_cmd_list.status == 0 &&
!list_empty(&dev->amthi_cmd_list.mei_cb.cb_list)) {
dev_dbg(&dev->pdev->dev, "complete amthi cmd_list cb.\n");
list_for_each_entry_safe(cb_pos, cb_next,
&dev->amthi_cmd_list.mei_cb.cb_list, cb_list) {
list_del(&cb_pos->cb_list);
cl_tmp = (struct mei_cl *)cb_pos->file_private;
if (cl_tmp && cl_tmp == &dev->iamthif_cl) {
status = amthi_write(dev, cb_pos);
if (status) {
dev_dbg(&dev->pdev->dev,
"amthi write failed status = %d\n",
status);
return;
}
break;
}
}
}
}
/**
* mei_free_cb_private - free mei_cb_private related memory
*
* @cb: mei callback struct
*/
void mei_free_cb_private(struct mei_cl_cb *cb)
{
if (cb == NULL)
return;
kfree(cb->request_buffer.data);
kfree(cb->response_buffer.data);
kfree(cb);
}