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dd5de1f165
1. Return zero on zero length read and writes 2. For a too large write return -EFBIG as defined in man write(2) EFBIG An attempt was made to write a file that exceeds the implementation-defined maximum file size or the process's file size limit, or to write at a position past the maximum allowed offset. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
744 lines
16 KiB
C
744 lines
16 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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/kernel.h>
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#include <linux/device.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/poll.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/sched.h>
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#include <linux/uuid.h>
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#include <linux/compat.h>
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#include <linux/jiffies.h>
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#include <linux/interrupt.h>
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#include <linux/miscdevice.h>
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#include <linux/mei.h>
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#include "mei_dev.h"
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#include "hw-me.h"
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#include "client.h"
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/**
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* mei_open - the open function
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*
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* @inode: pointer to inode structure
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* @file: pointer to file structure
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e
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* returns 0 on success, <0 on error
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*/
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static int mei_open(struct inode *inode, struct file *file)
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{
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struct miscdevice *misc = file->private_data;
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struct pci_dev *pdev;
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struct mei_cl *cl;
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struct mei_device *dev;
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int err;
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err = -ENODEV;
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if (!misc->parent)
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goto out;
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pdev = container_of(misc->parent, struct pci_dev, dev);
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dev = pci_get_drvdata(pdev);
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if (!dev)
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goto out;
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mutex_lock(&dev->device_lock);
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err = -ENOMEM;
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cl = mei_cl_allocate(dev);
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if (!cl)
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goto out_unlock;
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err = -ENODEV;
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if (dev->dev_state != MEI_DEV_ENABLED) {
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dev_dbg(&dev->pdev->dev, "dev_state != MEI_ENABLED dev_state = %s\n",
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mei_dev_state_str(dev->dev_state));
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goto out_unlock;
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}
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err = -EMFILE;
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if (dev->open_handle_count >= MEI_MAX_OPEN_HANDLE_COUNT) {
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dev_err(&dev->pdev->dev, "open_handle_count exceded %d",
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MEI_MAX_OPEN_HANDLE_COUNT);
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goto out_unlock;
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}
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err = mei_cl_link(cl, MEI_HOST_CLIENT_ID_ANY);
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if (err)
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goto out_unlock;
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file->private_data = cl;
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mutex_unlock(&dev->device_lock);
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return nonseekable_open(inode, file);
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out_unlock:
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mutex_unlock(&dev->device_lock);
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kfree(cl);
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out:
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return err;
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}
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/**
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* mei_release - the release function
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*
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* @inode: pointer to inode structure
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* @file: pointer to file structure
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*
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* returns 0 on success, <0 on error
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*/
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static int mei_release(struct inode *inode, struct file *file)
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{
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struct mei_cl *cl = file->private_data;
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struct mei_cl_cb *cb;
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struct mei_device *dev;
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int rets = 0;
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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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mutex_lock(&dev->device_lock);
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if (cl == &dev->iamthif_cl) {
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rets = mei_amthif_release(dev, file);
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goto out;
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}
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if (cl->state == MEI_FILE_CONNECTED) {
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cl->state = MEI_FILE_DISCONNECTING;
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dev_dbg(&dev->pdev->dev,
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"disconnecting client host client = %d, "
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"ME client = %d\n",
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cl->host_client_id,
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cl->me_client_id);
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rets = mei_cl_disconnect(cl);
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}
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mei_cl_flush_queues(cl);
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dev_dbg(&dev->pdev->dev, "remove client host client = %d, ME client = %d\n",
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cl->host_client_id,
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cl->me_client_id);
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if (dev->open_handle_count > 0) {
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clear_bit(cl->host_client_id, dev->host_clients_map);
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dev->open_handle_count--;
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}
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mei_cl_unlink(cl);
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/* free read cb */
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cb = NULL;
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if (cl->read_cb) {
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cb = mei_cl_find_read_cb(cl);
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/* Remove entry from read list */
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if (cb)
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list_del(&cb->list);
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cb = cl->read_cb;
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cl->read_cb = NULL;
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}
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file->private_data = NULL;
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if (cb) {
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mei_io_cb_free(cb);
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cb = NULL;
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}
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kfree(cl);
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out:
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mutex_unlock(&dev->device_lock);
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return rets;
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}
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/**
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* mei_read - the read function.
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*
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* @file: pointer to file structure
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* @ubuf: pointer to user buffer
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* @length: buffer length
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* @offset: data offset in buffer
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*
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* returns >=0 data length on success , <0 on error
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*/
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static ssize_t mei_read(struct file *file, char __user *ubuf,
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size_t length, loff_t *offset)
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{
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struct mei_cl *cl = file->private_data;
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struct mei_cl_cb *cb_pos = NULL;
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struct mei_cl_cb *cb = NULL;
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struct mei_device *dev;
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int rets;
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int err;
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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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mutex_lock(&dev->device_lock);
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if (dev->dev_state != MEI_DEV_ENABLED) {
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rets = -ENODEV;
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goto out;
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}
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if (length == 0) {
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rets = 0;
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goto out;
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}
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if (cl == &dev->iamthif_cl) {
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rets = mei_amthif_read(dev, file, ubuf, length, offset);
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goto out;
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}
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if (cl->read_cb) {
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cb = cl->read_cb;
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/* read what left */
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if (cb->buf_idx > *offset)
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goto copy_buffer;
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/* offset is beyond buf_idx we have no more data return 0 */
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if (cb->buf_idx > 0 && cb->buf_idx <= *offset) {
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rets = 0;
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goto free;
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}
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/* Offset needs to be cleaned for contiguous reads*/
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if (cb->buf_idx == 0 && *offset > 0)
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*offset = 0;
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} else if (*offset > 0) {
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*offset = 0;
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}
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err = mei_cl_read_start(cl, length);
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if (err && err != -EBUSY) {
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dev_dbg(&dev->pdev->dev,
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"mei start read failure with status = %d\n", err);
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rets = err;
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goto out;
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}
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if (MEI_READ_COMPLETE != cl->reading_state &&
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!waitqueue_active(&cl->rx_wait)) {
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if (file->f_flags & O_NONBLOCK) {
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rets = -EAGAIN;
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goto out;
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}
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mutex_unlock(&dev->device_lock);
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if (wait_event_interruptible(cl->rx_wait,
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(MEI_READ_COMPLETE == cl->reading_state ||
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MEI_FILE_INITIALIZING == cl->state ||
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MEI_FILE_DISCONNECTED == cl->state ||
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MEI_FILE_DISCONNECTING == cl->state))) {
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if (signal_pending(current))
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return -EINTR;
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return -ERESTARTSYS;
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}
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mutex_lock(&dev->device_lock);
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if (MEI_FILE_INITIALIZING == cl->state ||
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MEI_FILE_DISCONNECTED == cl->state ||
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MEI_FILE_DISCONNECTING == cl->state) {
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rets = -EBUSY;
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goto out;
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}
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}
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cb = cl->read_cb;
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if (!cb) {
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rets = -ENODEV;
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goto out;
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}
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if (cl->reading_state != MEI_READ_COMPLETE) {
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rets = 0;
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goto out;
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}
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/* now copy the data to user space */
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copy_buffer:
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dev_dbg(&dev->pdev->dev, "buf.size = %d buf.idx= %ld\n",
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cb->response_buffer.size, cb->buf_idx);
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if (length == 0 || ubuf == NULL || *offset > cb->buf_idx) {
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rets = -EMSGSIZE;
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goto free;
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}
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/* length is being truncated to PAGE_SIZE,
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* however buf_idx may point beyond that */
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length = min_t(size_t, length, cb->buf_idx - *offset);
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if (copy_to_user(ubuf, cb->response_buffer.data + *offset, length)) {
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rets = -EFAULT;
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goto free;
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}
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rets = length;
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*offset += length;
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if ((unsigned long)*offset < cb->buf_idx)
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goto out;
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free:
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cb_pos = mei_cl_find_read_cb(cl);
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/* Remove entry from read list */
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if (cb_pos)
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list_del(&cb_pos->list);
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mei_io_cb_free(cb);
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cl->reading_state = MEI_IDLE;
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cl->read_cb = NULL;
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out:
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dev_dbg(&dev->pdev->dev, "end mei read rets= %d\n", rets);
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mutex_unlock(&dev->device_lock);
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return rets;
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}
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/**
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* mei_write - the write function.
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*
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* @file: pointer to file structure
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* @ubuf: pointer to user buffer
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* @length: buffer length
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* @offset: data offset in buffer
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*
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* returns >=0 data length on success , <0 on error
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*/
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static ssize_t mei_write(struct file *file, const char __user *ubuf,
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size_t length, loff_t *offset)
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{
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struct mei_cl *cl = file->private_data;
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struct mei_cl_cb *write_cb = NULL;
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struct mei_device *dev;
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unsigned long timeout = 0;
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int rets;
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int id;
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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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mutex_lock(&dev->device_lock);
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if (dev->dev_state != MEI_DEV_ENABLED) {
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rets = -ENODEV;
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goto out;
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}
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id = mei_me_cl_by_id(dev, cl->me_client_id);
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if (id < 0) {
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rets = -ENODEV;
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goto out;
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}
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if (length == 0) {
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rets = 0;
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goto out;
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}
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if (length > dev->me_clients[id].props.max_msg_length) {
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rets = -EFBIG;
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goto out;
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}
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if (cl->state != MEI_FILE_CONNECTED) {
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dev_err(&dev->pdev->dev, "host client = %d, is not connected to ME client = %d",
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cl->host_client_id, cl->me_client_id);
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rets = -ENODEV;
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goto out;
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}
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if (cl == &dev->iamthif_cl) {
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write_cb = mei_amthif_find_read_list_entry(dev, file);
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if (write_cb) {
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timeout = write_cb->read_time +
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mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER);
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if (time_after(jiffies, timeout) ||
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cl->reading_state == MEI_READ_COMPLETE) {
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*offset = 0;
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list_del(&write_cb->list);
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mei_io_cb_free(write_cb);
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write_cb = NULL;
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}
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}
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}
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/* free entry used in read */
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if (cl->reading_state == MEI_READ_COMPLETE) {
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*offset = 0;
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write_cb = mei_cl_find_read_cb(cl);
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if (write_cb) {
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list_del(&write_cb->list);
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mei_io_cb_free(write_cb);
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write_cb = NULL;
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cl->reading_state = MEI_IDLE;
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cl->read_cb = NULL;
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}
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} else if (cl->reading_state == MEI_IDLE)
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*offset = 0;
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write_cb = mei_io_cb_init(cl, file);
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if (!write_cb) {
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dev_err(&dev->pdev->dev, "write cb allocation failed\n");
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rets = -ENOMEM;
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goto out;
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}
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rets = mei_io_cb_alloc_req_buf(write_cb, length);
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if (rets)
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goto out;
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rets = copy_from_user(write_cb->request_buffer.data, ubuf, length);
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if (rets) {
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dev_err(&dev->pdev->dev, "failed to copy data from userland\n");
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rets = -EFAULT;
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goto out;
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}
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if (cl == &dev->iamthif_cl) {
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rets = mei_amthif_write(dev, write_cb);
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if (rets) {
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dev_err(&dev->pdev->dev,
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"amthif write failed with status = %d\n", rets);
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goto out;
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}
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mutex_unlock(&dev->device_lock);
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return length;
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}
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rets = mei_cl_write(cl, write_cb, false);
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out:
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mutex_unlock(&dev->device_lock);
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if (rets < 0)
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mei_io_cb_free(write_cb);
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return rets;
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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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static 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_client *client;
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struct mei_cl *cl;
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int i;
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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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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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dev_dbg(&dev->pdev->dev, "Cannot connect to FW Client UUID = %pUl\n",
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&data->in_client_uuid);
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rets = -ENODEV;
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goto end;
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}
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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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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 amthif 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_amthif_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_cl_unlink(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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/* prepare the output buffer */
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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");
|
|
|
|
|
|
rets = mei_cl_connect(cl, file);
|
|
|
|
end:
|
|
return rets;
|
|
}
|
|
|
|
|
|
/**
|
|
* mei_ioctl - the IOCTL function
|
|
*
|
|
* @file: pointer to file structure
|
|
* @cmd: ioctl command
|
|
* @data: pointer to mei message structure
|
|
*
|
|
* returns 0 on success , <0 on error
|
|
*/
|
|
static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data)
|
|
{
|
|
struct mei_device *dev;
|
|
struct mei_cl *cl = file->private_data;
|
|
struct mei_connect_client_data *connect_data = NULL;
|
|
int rets;
|
|
|
|
if (cmd != IOCTL_MEI_CONNECT_CLIENT)
|
|
return -EINVAL;
|
|
|
|
if (WARN_ON(!cl || !cl->dev))
|
|
return -ENODEV;
|
|
|
|
dev = cl->dev;
|
|
|
|
dev_dbg(&dev->pdev->dev, "IOCTL cmd = 0x%x", cmd);
|
|
|
|
mutex_lock(&dev->device_lock);
|
|
if (dev->dev_state != MEI_DEV_ENABLED) {
|
|
rets = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
dev_dbg(&dev->pdev->dev, ": IOCTL_MEI_CONNECT_CLIENT.\n");
|
|
|
|
connect_data = kzalloc(sizeof(struct mei_connect_client_data),
|
|
GFP_KERNEL);
|
|
if (!connect_data) {
|
|
rets = -ENOMEM;
|
|
goto out;
|
|
}
|
|
dev_dbg(&dev->pdev->dev, "copy connect data from user\n");
|
|
if (copy_from_user(connect_data, (char __user *)data,
|
|
sizeof(struct mei_connect_client_data))) {
|
|
dev_err(&dev->pdev->dev, "failed to copy data from userland\n");
|
|
rets = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
rets = mei_ioctl_connect_client(file, connect_data);
|
|
|
|
/* if all is ok, copying the data back to user. */
|
|
if (rets)
|
|
goto out;
|
|
|
|
dev_dbg(&dev->pdev->dev, "copy connect data to user\n");
|
|
if (copy_to_user((char __user *)data, connect_data,
|
|
sizeof(struct mei_connect_client_data))) {
|
|
dev_dbg(&dev->pdev->dev, "failed to copy data to userland\n");
|
|
rets = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
kfree(connect_data);
|
|
mutex_unlock(&dev->device_lock);
|
|
return rets;
|
|
}
|
|
|
|
/**
|
|
* mei_compat_ioctl - the compat IOCTL function
|
|
*
|
|
* @file: pointer to file structure
|
|
* @cmd: ioctl command
|
|
* @data: pointer to mei message structure
|
|
*
|
|
* returns 0 on success , <0 on error
|
|
*/
|
|
#ifdef CONFIG_COMPAT
|
|
static long mei_compat_ioctl(struct file *file,
|
|
unsigned int cmd, unsigned long data)
|
|
{
|
|
return mei_ioctl(file, cmd, (unsigned long)compat_ptr(data));
|
|
}
|
|
#endif
|
|
|
|
|
|
/**
|
|
* mei_poll - the poll function
|
|
*
|
|
* @file: pointer to file structure
|
|
* @wait: pointer to poll_table structure
|
|
*
|
|
* returns poll mask
|
|
*/
|
|
static unsigned int mei_poll(struct file *file, poll_table *wait)
|
|
{
|
|
struct mei_cl *cl = file->private_data;
|
|
struct mei_device *dev;
|
|
unsigned int mask = 0;
|
|
|
|
if (WARN_ON(!cl || !cl->dev))
|
|
return POLLERR;
|
|
|
|
dev = cl->dev;
|
|
|
|
mutex_lock(&dev->device_lock);
|
|
|
|
if (!mei_cl_is_connected(cl)) {
|
|
mask = POLLERR;
|
|
goto out;
|
|
}
|
|
|
|
mutex_unlock(&dev->device_lock);
|
|
|
|
|
|
if (cl == &dev->iamthif_cl)
|
|
return mei_amthif_poll(dev, file, wait);
|
|
|
|
poll_wait(file, &cl->tx_wait, wait);
|
|
|
|
mutex_lock(&dev->device_lock);
|
|
|
|
if (!mei_cl_is_connected(cl)) {
|
|
mask = POLLERR;
|
|
goto out;
|
|
}
|
|
|
|
if (MEI_WRITE_COMPLETE == cl->writing_state)
|
|
mask |= (POLLIN | POLLRDNORM);
|
|
|
|
out:
|
|
mutex_unlock(&dev->device_lock);
|
|
return mask;
|
|
}
|
|
|
|
/*
|
|
* file operations structure will be used for mei char device.
|
|
*/
|
|
static const struct file_operations mei_fops = {
|
|
.owner = THIS_MODULE,
|
|
.read = mei_read,
|
|
.unlocked_ioctl = mei_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = mei_compat_ioctl,
|
|
#endif
|
|
.open = mei_open,
|
|
.release = mei_release,
|
|
.write = mei_write,
|
|
.poll = mei_poll,
|
|
.llseek = no_llseek
|
|
};
|
|
|
|
/*
|
|
* Misc Device Struct
|
|
*/
|
|
static struct miscdevice mei_misc_device = {
|
|
.name = "mei",
|
|
.fops = &mei_fops,
|
|
.minor = MISC_DYNAMIC_MINOR,
|
|
};
|
|
|
|
|
|
int mei_register(struct mei_device *dev)
|
|
{
|
|
int ret;
|
|
mei_misc_device.parent = &dev->pdev->dev;
|
|
ret = misc_register(&mei_misc_device);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (mei_dbgfs_register(dev, mei_misc_device.name))
|
|
dev_err(&dev->pdev->dev, "cannot register debugfs\n");
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mei_register);
|
|
|
|
void mei_deregister(struct mei_device *dev)
|
|
{
|
|
mei_dbgfs_deregister(dev);
|
|
misc_deregister(&mei_misc_device);
|
|
mei_misc_device.parent = NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mei_deregister);
|
|
|
|
static int __init mei_init(void)
|
|
{
|
|
return mei_cl_bus_init();
|
|
}
|
|
|
|
static void __exit mei_exit(void)
|
|
{
|
|
mei_cl_bus_exit();
|
|
}
|
|
|
|
module_init(mei_init);
|
|
module_exit(mei_exit);
|
|
|
|
MODULE_AUTHOR("Intel Corporation");
|
|
MODULE_DESCRIPTION("Intel(R) Management Engine Interface");
|
|
MODULE_LICENSE("GPL v2");
|
|
|