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mei: extract AMTHI functions into the amthif.c file

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Move AMT Host Interface functions into the new amthif.c file.
All functions has now common prefix: mei_amthif_

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tomas Winkler 2012-11-01 21:17:15 +02:00 committed by Greg Kroah-Hartman
parent 3870c3206b
commit 19838fb853
7 changed files with 613 additions and 556 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/misc/mei/Makefile
View File

@ -8,4 +8,5 @@ mei-objs += interrupt.o
mei-objs += interface.o
mei-objs += iorw.o
mei-objs += main.o
mei-objs += amthif.o
mei-objs += wd.o

572
drivers/misc/mei/amthif.c Normal file
View File

@ -0,0 +1,572 @@
/*
*
* 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"
const uuid_le mei_amthi_guid = UUID_LE(0x12f80028, 0xb4b7, 0x4b2d, 0xac,
0xa8, 0x46, 0xe0, 0xff, 0x65,
0x81, 0x4c);
/**
* mei_amthif_reset_params - initializes mei device iamthif
*
* @dev: the device structure
*/
void mei_amthif_reset_params(struct mei_device *dev)
{
/* reset iamthif parameters. */
dev->iamthif_current_cb = NULL;
dev->iamthif_msg_buf_size = 0;
dev->iamthif_msg_buf_index = 0;
dev->iamthif_canceled = false;
dev->iamthif_ioctl = false;
dev->iamthif_state = MEI_IAMTHIF_IDLE;
dev->iamthif_timer = 0;
}
/**
* mei_amthif_host_init_ - mei initialization amthif client.
*
* @dev: the device structure
*
*/
void mei_amthif_host_init(struct mei_device *dev)
{
int i;
unsigned char *msg_buf;
mei_cl_init(&dev->iamthif_cl, dev);
dev->iamthif_cl.state = MEI_FILE_DISCONNECTED;
/* find ME amthi client */
i = mei_me_cl_update_filext(dev, &dev->iamthif_cl,
&mei_amthi_guid, MEI_IAMTHIF_HOST_CLIENT_ID);
if (i < 0) {
dev_dbg(&dev->pdev->dev, "failed to find iamthif client.\n");
return;
}
/* Assign iamthif_mtu to the value received from ME */
dev->iamthif_mtu = dev->me_clients[i].props.max_msg_length;
dev_dbg(&dev->pdev->dev, "IAMTHIF_MTU = %d\n",
dev->me_clients[i].props.max_msg_length);
kfree(dev->iamthif_msg_buf);
dev->iamthif_msg_buf = NULL;
/* allocate storage for ME message buffer */
msg_buf = kcalloc(dev->iamthif_mtu,
sizeof(unsigned char), GFP_KERNEL);
if (!msg_buf) {
dev_dbg(&dev->pdev->dev, "memory allocation for ME message buffer failed.\n");
return;
}
dev->iamthif_msg_buf = msg_buf;
if (mei_connect(dev, &dev->iamthif_cl)) {
dev_dbg(&dev->pdev->dev, "Failed to connect to AMTHI client\n");
dev->iamthif_cl.state = MEI_FILE_DISCONNECTED;
dev->iamthif_cl.host_client_id = 0;
} else {
dev->iamthif_cl.timer_count = MEI_CONNECT_TIMEOUT;
}
}
/**
* mei_amthif_find_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 *mei_amthif_find_read_list_entry(struct mei_device *dev,
struct file *file)
{
struct mei_cl *cl_temp;
struct mei_cl_cb *pos = NULL;
struct mei_cl_cb *next = NULL;
list_for_each_entry_safe(pos, next,
&dev->amthi_read_complete_list.list, list) {
cl_temp = (struct mei_cl *)pos->file_private;
if (cl_temp && cl_temp == &dev->iamthif_cl &&
pos->file_object == file)
return pos;
}
return NULL;
}
/**
* mei_amthif_read - read data from AMTHIF 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 mei_amthif_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;
}
i = mei_me_cl_by_id(dev, dev->iamthif_cl.me_client_id);
if (i < 0) {
dev_dbg(&dev->pdev->dev, "amthi client not found.\n");
return -ENODEV;
}
dev_dbg(&dev->pdev->dev, "checking amthi data\n");
cb = mei_amthif_find_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 = mei_amthif_find_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 +
mei_secs_to_jiffies(MEI_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->list);
rets = -ETIMEDOUT;
goto free;
}
}
/* if the whole message will fit remove it from the list */
if (cb->buf_idx >= *offset && length >= (cb->buf_idx - *offset))
list_del(&cb->list);
else if (cb->buf_idx > 0 && cb->buf_idx <= *offset) {
/* end of the message has been reached */
list_del(&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->buf_idx - %lu\n", cb->buf_idx);
/* length is being turncated to PAGE_SIZE, however,
* the buf_idx may point beyond */
length = min_t(size_t, length, (cb->buf_idx - *offset));
if (copy_to_user(ubuf, cb->response_buffer.data + *offset, length))
rets = -EFAULT;
else {
rets = length;
if ((*offset + length) < cb->buf_idx) {
*offset += length;
goto out;
}
}
free:
dev_dbg(&dev->pdev->dev, "free amthi cb memory.\n");
*offset = 0;
mei_io_cb_free(cb);
out:
return rets;
}
/**
* mei_amthif_write - write amthif data to amthif client
*
* @dev: the device structure
* @cb: mei call back struct
*
* returns 0 on success, <0 on failure.
*/
int mei_amthif_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 = false;
dev->iamthif_ioctl = true;
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 = false;
if (cb->request_buffer.size > mei_hbuf_max_data(dev)) {
mei_hdr.length = mei_hbuf_max_data(dev);
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 = true;
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->list, &dev->write_waiting_list.list);
} else {
dev_dbg(&dev->pdev->dev, "message does not complete, so add amthi cb to write list.\n");
list_add_tail(&cb->list, &dev->write_list.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->list, &dev->write_list.list);
}
return 0;
}
/**
* mei_amthif_run_next_cmd
*
* @dev: the device structure
*
* returns 0 on success, <0 on failure.
*/
void mei_amthif_run_next_cmd(struct mei_device *dev)
{
struct mei_cl *cl_tmp;
struct mei_cl_cb *pos = NULL;
struct mei_cl_cb *next = NULL;
int status;
if (!dev)
return;
dev->iamthif_msg_buf_size = 0;
dev->iamthif_msg_buf_index = 0;
dev->iamthif_canceled = false;
dev->iamthif_ioctl = true;
dev->iamthif_state = MEI_IAMTHIF_IDLE;
dev->iamthif_timer = 0;
dev->iamthif_file_object = NULL;
dev_dbg(&dev->pdev->dev, "complete amthi cmd_list cb.\n");
list_for_each_entry_safe(pos, next, &dev->amthi_cmd_list.list, list) {
list_del(&pos->list);
cl_tmp = (struct mei_cl *)pos->file_private;
if (cl_tmp && cl_tmp == &dev->iamthif_cl) {
status = mei_amthif_write(dev, pos);
if (status) {
dev_dbg(&dev->pdev->dev,
"amthi write failed status = %d\n",
status);
return;
}
break;
}
}
}
/**
* mei_amthif_irq_process_completed - processes completed iamthif operation.
*
* @dev: the device structure.
* @slots: free slots.
* @cb_pos: callback block.
* @cl: private data of the file object.
* @cmpl_list: complete list.
*
* returns 0, OK; otherwise, error.
*/
int mei_amthif_irq_process_completed(struct mei_device *dev, s32 *slots,
struct mei_cl_cb *cb_pos,
struct mei_cl *cl,
struct mei_cl_cb *cmpl_list)
{
struct mei_msg_hdr *mei_hdr;
if ((*slots * sizeof(u32)) >= (sizeof(struct mei_msg_hdr) +
dev->iamthif_msg_buf_size -
dev->iamthif_msg_buf_index)) {
mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
mei_hdr->host_addr = cl->host_client_id;
mei_hdr->me_addr = cl->me_client_id;
mei_hdr->length = dev->iamthif_msg_buf_size -
dev->iamthif_msg_buf_index;
mei_hdr->msg_complete = 1;
mei_hdr->reserved = 0;
*slots -= mei_data2slots(mei_hdr->length);
if (mei_write_message(dev, mei_hdr,
(dev->iamthif_msg_buf +
dev->iamthif_msg_buf_index),
mei_hdr->length)) {
dev->iamthif_state = MEI_IAMTHIF_IDLE;
cl->status = -ENODEV;
list_del(&cb_pos->list);
return -ENODEV;
} else {
if (mei_flow_ctrl_reduce(dev, cl))
return -ENODEV;
dev->iamthif_msg_buf_index += mei_hdr->length;
cb_pos->buf_idx = dev->iamthif_msg_buf_index;
cl->status = 0;
dev->iamthif_state = MEI_IAMTHIF_FLOW_CONTROL;
dev->iamthif_flow_control_pending = true;
/* save iamthif cb sent to amthi client */
dev->iamthif_current_cb = cb_pos;
list_move_tail(&cb_pos->list,
&dev->write_waiting_list.list);
}
} else if (*slots == dev->hbuf_depth) {
/* buffer is still empty */
mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
mei_hdr->host_addr = cl->host_client_id;
mei_hdr->me_addr = cl->me_client_id;
mei_hdr->length =
(*slots * sizeof(u32)) - sizeof(struct mei_msg_hdr);
mei_hdr->msg_complete = 0;
mei_hdr->reserved = 0;
*slots -= mei_data2slots(mei_hdr->length);
if (mei_write_message(dev, mei_hdr,
(dev->iamthif_msg_buf +
dev->iamthif_msg_buf_index),
mei_hdr->length)) {
cl->status = -ENODEV;
list_del(&cb_pos->list);
} else {
dev->iamthif_msg_buf_index += mei_hdr->length;
}
return -EMSGSIZE;
} else {
return -EBADMSG;
}
return 0;
}
/**
* mei_amthif_irq_read_message - read routine after ISR to
* handle the read amthi message
*
* @complete_list: An instance of our list structure
* @dev: the device structure
* @mei_hdr: header of amthi message
*
* returns 0 on success, <0 on failure.
*/
int mei_amthif_irq_read_message(struct mei_cl_cb *complete_list,
struct mei_device *dev, struct mei_msg_hdr *mei_hdr)
{
struct mei_cl *cl;
struct mei_cl_cb *cb;
unsigned char *buffer;
BUG_ON(mei_hdr->me_addr != dev->iamthif_cl.me_client_id);
BUG_ON(dev->iamthif_state != MEI_IAMTHIF_READING);
buffer = dev->iamthif_msg_buf + dev->iamthif_msg_buf_index;
BUG_ON(dev->iamthif_mtu < dev->iamthif_msg_buf_index + mei_hdr->length);
mei_read_slots(dev, buffer, mei_hdr->length);
dev->iamthif_msg_buf_index += mei_hdr->length;
if (!mei_hdr->msg_complete)
return 0;
dev_dbg(&dev->pdev->dev,
"amthi_message_buffer_index =%d\n",
mei_hdr->length);
dev_dbg(&dev->pdev->dev, "completed amthi read.\n ");
if (!dev->iamthif_current_cb)
return -ENODEV;
cb = dev->iamthif_current_cb;
dev->iamthif_current_cb = NULL;
cl = (struct mei_cl *)cb->file_private;
if (!cl)
return -ENODEV;
dev->iamthif_stall_timer = 0;
cb->buf_idx = dev->iamthif_msg_buf_index;
cb->read_time = jiffies;
if (dev->iamthif_ioctl && cl == &dev->iamthif_cl) {
/* found the iamthif cb */
dev_dbg(&dev->pdev->dev, "complete the amthi read cb.\n ");
dev_dbg(&dev->pdev->dev, "add the amthi read cb to complete.\n ");
list_add_tail(&cb->list, &complete_list->list);
}
return 0;
}
/**
* mei_amthif_irq_read - prepares to read amthif data.
*
* @dev: the device structure.
* @slots: free slots.
*
* returns 0, OK; otherwise, error.
*/
int mei_amthif_irq_read(struct mei_device *dev, s32 *slots)
{
if (((*slots) * sizeof(u32)) < (sizeof(struct mei_msg_hdr)
+ sizeof(struct hbm_flow_control))) {
return -EMSGSIZE;
}
*slots -= mei_data2slots(sizeof(struct hbm_flow_control));
if (mei_send_flow_control(dev, &dev->iamthif_cl)) {
dev_dbg(&dev->pdev->dev, "iamthif flow control failed\n");
return -EIO;
}
dev_dbg(&dev->pdev->dev, "iamthif flow control success\n");
dev->iamthif_state = MEI_IAMTHIF_READING;
dev->iamthif_flow_control_pending = false;
dev->iamthif_msg_buf_index = 0;
dev->iamthif_msg_buf_size = 0;
dev->iamthif_stall_timer = MEI_IAMTHIF_STALL_TIMER;
dev->mei_host_buffer_is_empty = mei_hbuf_is_empty(dev);
return 0;
}
/**
* mei_amthif_complete - complete amthif callback.
*
* @dev: the device structure.
* @cb_pos: callback block.
*/
void mei_amthif_complete(struct mei_device *dev, struct mei_cl_cb *cb)
{
if (dev->iamthif_canceled != 1) {
dev->iamthif_state = MEI_IAMTHIF_READ_COMPLETE;
dev->iamthif_stall_timer = 0;
memcpy(cb->response_buffer.data,
dev->iamthif_msg_buf,
dev->iamthif_msg_buf_index);
list_add_tail(&cb->list, &dev->amthi_read_complete_list.list);
dev_dbg(&dev->pdev->dev, "amthi read completed\n");
dev->iamthif_timer = jiffies;
dev_dbg(&dev->pdev->dev, "dev->iamthif_timer = %ld\n",
dev->iamthif_timer);
} else {
mei_amthif_run_next_cmd(dev);
}
dev_dbg(&dev->pdev->dev, "completing amthi call back.\n");
wake_up_interruptible(&dev->iamthif_cl.wait);
}

73
drivers/misc/mei/init.c
View File

@ -43,10 +43,6 @@ const char *mei_dev_state_str(int state)
}
const uuid_le mei_amthi_guid = UUID_LE(0x12f80028, 0xb4b7, 0x4b2d, 0xac,
0xa8, 0x46, 0xe0, 0xff, 0x65,
0x81, 0x4c);
/**
* mei_io_list_flush - removes list entry belonging to cl.
*
@ -91,23 +87,6 @@ int mei_cl_flush_queues(struct mei_cl *cl)
/**
* mei_reset_iamthif_params - initializes mei device iamthif
*
* @dev: the device structure
*/
static void mei_reset_iamthif_params(struct mei_device *dev)
{
/* reset iamthif parameters. */
dev->iamthif_current_cb = NULL;
dev->iamthif_msg_buf_size = 0;
dev->iamthif_msg_buf_index = 0;
dev->iamthif_canceled = false;
dev->iamthif_ioctl = false;
dev->iamthif_state = MEI_IAMTHIF_IDLE;
dev->iamthif_timer = 0;
}
/**
* init_mei_device - allocates and initializes the mei device structure
*
@ -313,7 +292,7 @@ void mei_reset(struct mei_device *dev, int interrupts_enabled)
mei_remove_client_from_file_list(dev,
dev->iamthif_cl.host_client_id);
mei_reset_iamthif_params(dev);
mei_amthif_reset_params(dev);
dev->extra_write_index = 0;
}
@ -576,56 +555,6 @@ int mei_me_cl_update_filext(struct mei_device *dev, struct mei_cl *cl,
return -ENOENT;
}
/**
* host_init_iamthif - mei initialization iamthif client.
*
* @dev: the device structure
*
*/
void mei_host_init_iamthif(struct mei_device *dev)
{
int i;
unsigned char *msg_buf;
mei_cl_init(&dev->iamthif_cl, dev);
dev->iamthif_cl.state = MEI_FILE_DISCONNECTED;
/* find ME amthi client */
i = mei_me_cl_update_filext(dev, &dev->iamthif_cl,
&mei_amthi_guid, MEI_IAMTHIF_HOST_CLIENT_ID);
if (i < 0) {
dev_dbg(&dev->pdev->dev, "failed to find iamthif client.\n");
return;
}
/* Assign iamthif_mtu to the value received from ME */
dev->iamthif_mtu = dev->me_clients[i].props.max_msg_length;
dev_dbg(&dev->pdev->dev, "IAMTHIF_MTU = %d\n",
dev->me_clients[i].props.max_msg_length);
kfree(dev->iamthif_msg_buf);
dev->iamthif_msg_buf = NULL;
/* allocate storage for ME message buffer */
msg_buf = kcalloc(dev->iamthif_mtu,
sizeof(unsigned char), GFP_KERNEL);
if (!msg_buf) {
dev_dbg(&dev->pdev->dev, "memory allocation for ME message buffer failed.\n");
return;
}
dev->iamthif_msg_buf = msg_buf;
if (mei_connect(dev, &dev->iamthif_cl)) {
dev_dbg(&dev->pdev->dev, "Failed to connect to AMTHI client\n");
dev->iamthif_cl.state = MEI_FILE_DISCONNECTED;
dev->iamthif_cl.host_client_id = 0;
} else {
dev->iamthif_cl.timer_count = MEI_CONNECT_TIMEOUT;
}
}
/**
* mei_alloc_file_private - allocates a private file structure and sets it up.
* @file: the file structure

218
drivers/misc/mei/interrupt.c
View File

@ -73,92 +73,6 @@ static void _mei_cmpl(struct mei_cl *cl, struct mei_cl_cb *cb_pos)
}
}
/**
* _mei_cmpl_iamthif - processes completed iamthif operation.
*
* @dev: the device structure.
* @cb_pos: callback block.
*/
static void _mei_cmpl_iamthif(struct mei_device *dev, struct mei_cl_cb *cb_pos)
{
if (dev->iamthif_canceled != 1) {
dev->iamthif_state = MEI_IAMTHIF_READ_COMPLETE;
dev->iamthif_stall_timer = 0;
memcpy(cb_pos->response_buffer.data,
dev->iamthif_msg_buf,
dev->iamthif_msg_buf_index);
list_add_tail(&cb_pos->list, &dev->amthi_read_complete_list.list);
dev_dbg(&dev->pdev->dev, "amthi read completed\n");
dev->iamthif_timer = jiffies;
dev_dbg(&dev->pdev->dev, "dev->iamthif_timer = %ld\n",
dev->iamthif_timer);
} else {
mei_run_next_iamthif_cmd(dev);
}
dev_dbg(&dev->pdev->dev, "completing amthi call back.\n");
wake_up_interruptible(&dev->iamthif_cl.wait);
}
/**
* mei_irq_thread_read_amthi_message - bottom half read routine after ISR to
* handle the read amthi message data processing.
*
* @complete_list: An instance of our list structure
* @dev: the device structure
* @mei_hdr: header of amthi message
*
* returns 0 on success, <0 on failure.
*/
static int mei_irq_thread_read_amthi_message(struct mei_cl_cb *complete_list,
struct mei_device *dev,
struct mei_msg_hdr *mei_hdr)
{
struct mei_cl *cl;
struct mei_cl_cb *cb;
unsigned char *buffer;
BUG_ON(mei_hdr->me_addr != dev->iamthif_cl.me_client_id);
BUG_ON(dev->iamthif_state != MEI_IAMTHIF_READING);
buffer = dev->iamthif_msg_buf + dev->iamthif_msg_buf_index;
BUG_ON(dev->iamthif_mtu < dev->iamthif_msg_buf_index + mei_hdr->length);
mei_read_slots(dev, buffer, mei_hdr->length);
dev->iamthif_msg_buf_index += mei_hdr->length;
if (!mei_hdr->msg_complete)
return 0;
dev_dbg(&dev->pdev->dev,
"amthi_message_buffer_index =%d\n",
mei_hdr->length);
dev_dbg(&dev->pdev->dev, "completed amthi read.\n ");
if (!dev->iamthif_current_cb)
return -ENODEV;
cb = dev->iamthif_current_cb;
dev->iamthif_current_cb = NULL;
cl = (struct mei_cl *)cb->file_private;
if (!cl)
return -ENODEV;
dev->iamthif_stall_timer = 0;
cb->buf_idx = dev->iamthif_msg_buf_index;
cb->read_time = jiffies;
if (dev->iamthif_ioctl && cl == &dev->iamthif_cl) {
/* found the iamthif cb */
dev_dbg(&dev->pdev->dev, "complete the amthi read cb.\n ");
dev_dbg(&dev->pdev->dev, "add the amthi read cb to complete.\n ");
list_add_tail(&cb->list, &complete_list->list);
}
return 0;
}
/**
* _mei_irq_thread_state_ok - checks if mei header matches file private data
*
@ -243,37 +157,6 @@ quit:
return 0;
}
/**
* _mei_irq_thread_iamthif_read - prepares to read iamthif data.
*
* @dev: the device structure.
* @slots: free slots.
*
* returns 0, OK; otherwise, error.
*/
static int _mei_irq_thread_iamthif_read(struct mei_device *dev, s32 *slots)
{
if (((*slots) * sizeof(u32)) < (sizeof(struct mei_msg_hdr)
+ sizeof(struct hbm_flow_control))) {
return -EMSGSIZE;
}
*slots -= mei_data2slots(sizeof(struct hbm_flow_control));
if (mei_send_flow_control(dev, &dev->iamthif_cl)) {
dev_dbg(&dev->pdev->dev, "iamthif flow control failed\n");
return -EIO;
}
dev_dbg(&dev->pdev->dev, "iamthif flow control success\n");
dev->iamthif_state = MEI_IAMTHIF_READING;
dev->iamthif_flow_control_pending = false;
dev->iamthif_msg_buf_index = 0;
dev->iamthif_msg_buf_size = 0;
dev->iamthif_stall_timer = MEI_IAMTHIF_STALL_TIMER;
dev->mei_host_buffer_is_empty = mei_hbuf_is_empty(dev);
return 0;
}
/**
* _mei_irq_thread_close - processes close related operation.
*
@ -370,7 +253,7 @@ static void mei_client_connect_response(struct mei_device *dev,
mei_watchdog_register(dev);
/* next step in the state maching */
mei_host_init_iamthif(dev);
mei_amthif_host_init(dev);
return;
}
@ -728,7 +611,7 @@ static void mei_irq_thread_read_bus_message(struct mei_device *dev,
* will be received
*/
if (mei_wd_host_init(dev))
mei_host_init_iamthif(dev);
mei_amthif_host_init(dev);
}
} else {
@ -963,87 +846,6 @@ static int _mei_irq_thread_cmpl(struct mei_device *dev, s32 *slots,
return 0;
}
/**
* _mei_irq_thread_cmpl_iamthif - processes completed iamthif operation.
*
* @dev: the device structure.
* @slots: free slots.
* @cb_pos: callback block.
* @cl: private data of the file object.
* @cmpl_list: complete list.
*
* returns 0, OK; otherwise, error.
*/
static int _mei_irq_thread_cmpl_iamthif(struct mei_device *dev, s32 *slots,
struct mei_cl_cb *cb_pos,
struct mei_cl *cl,
struct mei_cl_cb *cmpl_list)
{
struct mei_msg_hdr *mei_hdr;
if ((*slots * sizeof(u32)) >= (sizeof(struct mei_msg_hdr) +
dev->iamthif_msg_buf_size -
dev->iamthif_msg_buf_index)) {
mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
mei_hdr->host_addr = cl->host_client_id;
mei_hdr->me_addr = cl->me_client_id;
mei_hdr->length = dev->iamthif_msg_buf_size -
dev->iamthif_msg_buf_index;
mei_hdr->msg_complete = 1;
mei_hdr->reserved = 0;
*slots -= mei_data2slots(mei_hdr->length);
if (mei_write_message(dev, mei_hdr,
(dev->iamthif_msg_buf +
dev->iamthif_msg_buf_index),
mei_hdr->length)) {
dev->iamthif_state = MEI_IAMTHIF_IDLE;
cl->status = -ENODEV;
list_del(&cb_pos->list);
return -ENODEV;
} else {
if (mei_flow_ctrl_reduce(dev, cl))
return -ENODEV;
dev->iamthif_msg_buf_index += mei_hdr->length;
cb_pos->buf_idx = dev->iamthif_msg_buf_index;
cl->status = 0;
dev->iamthif_state = MEI_IAMTHIF_FLOW_CONTROL;
dev->iamthif_flow_control_pending = true;
/* save iamthif cb sent to amthi client */
dev->iamthif_current_cb = cb_pos;
list_move_tail(&cb_pos->list, &dev->write_waiting_list.list);
}
} else if (*slots == dev->hbuf_depth) {
/* buffer is still empty */
mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
mei_hdr->host_addr = cl->host_client_id;
mei_hdr->me_addr = cl->me_client_id;
mei_hdr->length =
(*slots * sizeof(u32)) - sizeof(struct mei_msg_hdr);
mei_hdr->msg_complete = 0;
mei_hdr->reserved = 0;
*slots -= mei_data2slots(mei_hdr->length);
if (mei_write_message(dev, mei_hdr,
(dev->iamthif_msg_buf +
dev->iamthif_msg_buf_index),
mei_hdr->length)) {
cl->status = -ENODEV;
list_del(&cb_pos->list);
} else {
dev->iamthif_msg_buf_index += mei_hdr->length;
}
return -EMSGSIZE;
} else {
return -EBADMSG;
}
return 0;
}
/**
* mei_irq_thread_read_handler - bottom half read routine after ISR to
* handle the read processing.
@ -1117,8 +919,8 @@ static int mei_irq_thread_read_handler(struct mei_cl_cb *cmpl_list,
dev_dbg(&dev->pdev->dev, "call mei_irq_thread_read_iamthif_message.\n");
dev_dbg(&dev->pdev->dev, "mei_hdr->length =%d\n",
mei_hdr->length);
ret = mei_irq_thread_read_amthi_message(cmpl_list,
dev, mei_hdr);
ret = mei_amthif_irq_read_message(cmpl_list, dev, mei_hdr);
if (ret)
goto end;
@ -1195,7 +997,7 @@ static int mei_irq_thread_write_handler(struct mei_cl_cb *cmpl_list,
if (cl == &dev->iamthif_cl) {
dev_dbg(&dev->pdev->dev, "check iamthif flow control.\n");
if (dev->iamthif_flow_control_pending) {
ret = _mei_irq_thread_iamthif_read(dev, slots);
ret = mei_amthif_irq_read(dev, slots);
if (ret)
return ret;
}
@ -1300,8 +1102,8 @@ static int mei_irq_thread_write_handler(struct mei_cl_cb *cmpl_list,
cl->host_client_id);
continue;
}
ret = _mei_irq_thread_cmpl_iamthif(dev, slots, pos,
cl, cmpl_list);
ret = mei_amthif_irq_process_completed(dev, slots, pos,
cl, cmpl_list);
if (ret)
return ret;
@ -1372,7 +1174,7 @@ void mei_timer(struct work_struct *work)
dev->iamthif_current_cb = NULL;
dev->iamthif_file_object = NULL;
mei_run_next_iamthif_cmd(dev);
mei_amthif_run_next_cmd(dev);
}
}
@ -1409,7 +1211,7 @@ void mei_timer(struct work_struct *work)
dev->iamthif_file_object->private_data = NULL;
dev->iamthif_file_object = NULL;
dev->iamthif_timer = 0;
mei_run_next_iamthif_cmd(dev);
mei_amthif_run_next_cmd(dev);
}
}
@ -1524,7 +1326,7 @@ end:
_mei_cmpl(cl, cb_pos);
cb_pos = NULL;
} else if (cl == &dev->iamthif_cl) {
_mei_cmpl_iamthif(dev, cb_pos);
mei_amthif_complete(dev, cb_pos);
}
}
}

266
drivers/misc/mei/iorw.c
View File

@ -319,152 +319,6 @@ end:
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 *pos = NULL;
struct mei_cl_cb *next = NULL;
list_for_each_entry_safe(pos, next,
&dev->amthi_read_complete_list.list, list) {
cl_temp = (struct mei_cl *)pos->file_private;
if (cl_temp && cl_temp == &dev->iamthif_cl &&
pos->file_object == file)
return 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;
}
i = mei_me_cl_by_id(dev, dev->iamthif_cl.me_client_id);
if (i < 0) {
dev_dbg(&dev->pdev->dev, "amthi client not found.\n");
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 +
mei_secs_to_jiffies(MEI_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->list);
rets = -ETIMEDOUT;
goto free;
}
}
/* if the whole message will fit remove it from the list */
if (cb->buf_idx >= *offset && length >= (cb->buf_idx - *offset))
list_del(&cb->list);
else if (cb->buf_idx > 0 && cb->buf_idx <= *offset) {
/* end of the message has been reached */
list_del(&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->buf_idx - %lu\n", cb->buf_idx);
/* length is being turncated to PAGE_SIZE, however,
* the buf_idx may point beyond */
length = min_t(size_t, length, (cb->buf_idx - *offset));
if (copy_to_user(ubuf, cb->response_buffer.data + *offset, length))
rets = -EFAULT;
else {
rets = length;
if ((*offset + length) < cb->buf_idx) {
*offset += length;
goto out;
}
}
free:
dev_dbg(&dev->pdev->dev, "free amthi cb memory.\n");
*offset = 0;
mei_io_cb_free(cb);
out:
return rets;
}
/**
* mei_start_read - the start read client message function.
*
@ -524,123 +378,3 @@ err:
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 = false;
dev->iamthif_ioctl = true;
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 = false;
if (cb->request_buffer.size > mei_hbuf_max_data(dev)) {
mei_hdr.length = mei_hbuf_max_data(dev);
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 = true;
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->list, &dev->write_waiting_list.list);
} else {
dev_dbg(&dev->pdev->dev, "message does not complete, "
"so add amthi cb to write list.\n");
list_add_tail(&cb->list, &dev->write_list.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->list, &dev->write_list.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 mei_run_next_iamthif_cmd(struct mei_device *dev)
{
struct mei_cl *cl_tmp;
struct mei_cl_cb *pos = NULL;
struct mei_cl_cb *next = NULL;
int status;
if (!dev)
return;
dev->iamthif_msg_buf_size = 0;
dev->iamthif_msg_buf_index = 0;
dev->iamthif_canceled = false;
dev->iamthif_ioctl = true;
dev->iamthif_state = MEI_IAMTHIF_IDLE;
dev->iamthif_timer = 0;
dev->iamthif_file_object = NULL;
dev_dbg(&dev->pdev->dev, "complete amthi cmd_list cb.\n");
list_for_each_entry_safe(pos, next, &dev->amthi_cmd_list.list, list) {
list_del(&pos->list);
cl_tmp = (struct mei_cl *)pos->file_private;
if (cl_tmp && cl_tmp == &dev->iamthif_cl) {
status = amthi_write(dev, pos);
if (status) {
dev_dbg(&dev->pdev->dev,
"amthi write failed status = %d\n",
status);
return;
}
break;
}
}
}

10
drivers/misc/mei/main.c
View File

@ -349,7 +349,7 @@ static int mei_release(struct inode *inode, struct file *file)
dev->iamthif_canceled = true;
if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE) {
dev_dbg(&dev->pdev->dev, "run next amthi iamthif cb\n");
mei_run_next_iamthif_cmd(dev);
mei_amthif_run_next_cmd(dev);
}
}
@ -410,7 +410,7 @@ static ssize_t mei_read(struct file *file, char __user *ubuf,
}
if (cl == &dev->iamthif_cl) {
rets = amthi_read(dev, file, ubuf, length, offset);
rets = mei_amthif_read(dev, file, ubuf, length, offset);
goto out;
}
@ -563,7 +563,7 @@ static ssize_t mei_write(struct file *file, const char __user *ubuf,
goto err;
}
if (cl == &dev->iamthif_cl) {
write_cb = find_amthi_read_list_entry(dev, file);
write_cb = mei_amthif_find_read_list_entry(dev, file);
if (write_cb) {
timeout = write_cb->read_time +
@ -636,7 +636,7 @@ static ssize_t mei_write(struct file *file, const char __user *ubuf,
list_add_tail(&write_cb->list, &dev->amthi_cmd_list.list);
} else {
dev_dbg(&dev->pdev->dev, "call amthi write\n");
rets = amthi_write(dev, write_cb);
rets = mei_amthif_write(dev, write_cb);
if (rets) {
dev_err(&dev->pdev->dev, "amthi write failed with status = %d\n",
@ -823,7 +823,7 @@ static unsigned int mei_poll(struct file *file, poll_table *wait)
dev->iamthif_file_object == file) {
mask |= (POLLIN | POLLRDNORM);
dev_dbg(&dev->pdev->dev, "run next amthi cb\n");
mei_run_next_iamthif_cmd(dev);
mei_amthif_run_next_cmd(dev);
}
goto out;
}

29
drivers/misc/mei/mei_dev.h
View File

@ -286,7 +286,6 @@ int mei_task_initialize_clients(void *data);
int mei_initialize_clients(struct mei_device *dev);
int mei_disconnect_host_client(struct mei_device *dev, struct mei_cl *cl);
void mei_remove_client_from_file_list(struct mei_device *dev, u8 host_client_id);
void mei_host_init_iamthif(struct mei_device *dev);
void mei_allocate_me_clients_storage(struct mei_device *dev);
@ -362,17 +361,37 @@ int mei_ioctl_connect_client(struct file *file,
int mei_start_read(struct mei_device *dev, struct mei_cl *cl);
int amthi_write(struct mei_device *dev, struct mei_cl_cb *priv_cb);
int amthi_read(struct mei_device *dev, struct file *file,
/*
* AMTHIF - AMT Host Interface Functions
*/
void mei_amthif_reset_params(struct mei_device *dev);
void mei_amthif_host_init(struct mei_device *dev);
int mei_amthif_write(struct mei_device *dev, struct mei_cl_cb *priv_cb);
int mei_amthif_read(struct mei_device *dev, struct file *file,
char __user *ubuf, size_t length, loff_t *offset);
struct mei_cl_cb *find_amthi_read_list_entry(struct mei_device *dev,
struct mei_cl_cb *mei_amthif_find_read_list_entry(struct mei_device *dev,
struct file *file);
void mei_run_next_iamthif_cmd(struct mei_device *dev);
void mei_amthif_run_next_cmd(struct mei_device *dev);
int mei_amthif_read_message(struct mei_cl_cb *complete_list,
struct mei_device *dev, struct mei_msg_hdr *mei_hdr);
int mei_amthif_irq_process_completed(struct mei_device *dev, s32 *slots,
struct mei_cl_cb *cb_pos,
struct mei_cl *cl,
struct mei_cl_cb *cmpl_list);
void mei_amthif_complete(struct mei_device *dev, struct mei_cl_cb *cb);
int mei_amthif_irq_read_message(struct mei_cl_cb *complete_list,
struct mei_device *dev, struct mei_msg_hdr *mei_hdr);
int mei_amthif_irq_read(struct mei_device *dev, s32 *slots);
/*
* Register Access Function