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733 lines
16 KiB
733 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2015, 2016 IBM Corporation |
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* Copyright (C) 2016 Intel Corporation |
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* |
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* Author: Stefan Berger <[email protected]> |
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* |
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* Maintained by: <[email protected]> |
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* |
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* Device driver for vTPM (vTPM proxy driver) |
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*/ |
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#include <linux/types.h> |
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#include <linux/spinlock.h> |
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#include <linux/uaccess.h> |
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#include <linux/wait.h> |
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#include <linux/miscdevice.h> |
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#include <linux/vtpm_proxy.h> |
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#include <linux/file.h> |
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#include <linux/anon_inodes.h> |
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#include <linux/poll.h> |
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#include <linux/compat.h> |
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#include "tpm.h" |
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#define VTPM_PROXY_REQ_COMPLETE_FLAG BIT(0) |
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struct proxy_dev { |
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struct tpm_chip *chip; |
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u32 flags; /* public API flags */ |
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wait_queue_head_t wq; |
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struct mutex buf_lock; /* protect buffer and flags */ |
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long state; /* internal state */ |
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#define STATE_OPENED_FLAG BIT(0) |
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#define STATE_WAIT_RESPONSE_FLAG BIT(1) /* waiting for emulator response */ |
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#define STATE_REGISTERED_FLAG BIT(2) |
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#define STATE_DRIVER_COMMAND BIT(3) /* sending a driver specific command */ |
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size_t req_len; /* length of queued TPM request */ |
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size_t resp_len; /* length of queued TPM response */ |
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u8 buffer[TPM_BUFSIZE]; /* request/response buffer */ |
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struct work_struct work; /* task that retrieves TPM timeouts */ |
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}; |
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/* all supported flags */ |
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#define VTPM_PROXY_FLAGS_ALL (VTPM_PROXY_FLAG_TPM2) |
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static struct workqueue_struct *workqueue; |
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static void vtpm_proxy_delete_device(struct proxy_dev *proxy_dev); |
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|
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/* |
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* Functions related to 'server side' |
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*/ |
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/** |
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* vtpm_proxy_fops_read - Read TPM commands on 'server side' |
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* |
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* @filp: file pointer |
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* @buf: read buffer |
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* @count: number of bytes to read |
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* @off: offset |
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* |
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* Return: |
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* Number of bytes read or negative error code |
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*/ |
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static ssize_t vtpm_proxy_fops_read(struct file *filp, char __user *buf, |
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size_t count, loff_t *off) |
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{ |
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struct proxy_dev *proxy_dev = filp->private_data; |
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size_t len; |
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int sig, rc; |
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sig = wait_event_interruptible(proxy_dev->wq, |
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proxy_dev->req_len != 0 || |
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!(proxy_dev->state & STATE_OPENED_FLAG)); |
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if (sig) |
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return -EINTR; |
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mutex_lock(&proxy_dev->buf_lock); |
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if (!(proxy_dev->state & STATE_OPENED_FLAG)) { |
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mutex_unlock(&proxy_dev->buf_lock); |
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return -EPIPE; |
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} |
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len = proxy_dev->req_len; |
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if (count < len) { |
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mutex_unlock(&proxy_dev->buf_lock); |
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pr_debug("Invalid size in recv: count=%zd, req_len=%zd\n", |
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count, len); |
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return -EIO; |
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} |
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rc = copy_to_user(buf, proxy_dev->buffer, len); |
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memset(proxy_dev->buffer, 0, len); |
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proxy_dev->req_len = 0; |
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if (!rc) |
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proxy_dev->state |= STATE_WAIT_RESPONSE_FLAG; |
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mutex_unlock(&proxy_dev->buf_lock); |
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if (rc) |
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return -EFAULT; |
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return len; |
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} |
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/** |
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* vtpm_proxy_fops_write - Write TPM responses on 'server side' |
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* |
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* @filp: file pointer |
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* @buf: write buffer |
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* @count: number of bytes to write |
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* @off: offset |
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* |
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* Return: |
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* Number of bytes read or negative error value |
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*/ |
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static ssize_t vtpm_proxy_fops_write(struct file *filp, const char __user *buf, |
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size_t count, loff_t *off) |
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{ |
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struct proxy_dev *proxy_dev = filp->private_data; |
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mutex_lock(&proxy_dev->buf_lock); |
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if (!(proxy_dev->state & STATE_OPENED_FLAG)) { |
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mutex_unlock(&proxy_dev->buf_lock); |
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return -EPIPE; |
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} |
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if (count > sizeof(proxy_dev->buffer) || |
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!(proxy_dev->state & STATE_WAIT_RESPONSE_FLAG)) { |
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mutex_unlock(&proxy_dev->buf_lock); |
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return -EIO; |
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} |
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proxy_dev->state &= ~STATE_WAIT_RESPONSE_FLAG; |
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proxy_dev->req_len = 0; |
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if (copy_from_user(proxy_dev->buffer, buf, count)) { |
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mutex_unlock(&proxy_dev->buf_lock); |
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return -EFAULT; |
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} |
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proxy_dev->resp_len = count; |
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mutex_unlock(&proxy_dev->buf_lock); |
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wake_up_interruptible(&proxy_dev->wq); |
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return count; |
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} |
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/* |
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* vtpm_proxy_fops_poll - Poll status on 'server side' |
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* |
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* @filp: file pointer |
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* @wait: poll table |
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* |
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* Return: Poll flags |
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*/ |
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static __poll_t vtpm_proxy_fops_poll(struct file *filp, poll_table *wait) |
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{ |
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struct proxy_dev *proxy_dev = filp->private_data; |
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__poll_t ret; |
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poll_wait(filp, &proxy_dev->wq, wait); |
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ret = EPOLLOUT; |
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mutex_lock(&proxy_dev->buf_lock); |
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if (proxy_dev->req_len) |
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ret |= EPOLLIN | EPOLLRDNORM; |
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if (!(proxy_dev->state & STATE_OPENED_FLAG)) |
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ret |= EPOLLHUP; |
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mutex_unlock(&proxy_dev->buf_lock); |
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return ret; |
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} |
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/* |
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* vtpm_proxy_fops_open - Open vTPM device on 'server side' |
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* |
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* @filp: file pointer |
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* |
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* Called when setting up the anonymous file descriptor |
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*/ |
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static void vtpm_proxy_fops_open(struct file *filp) |
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{ |
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struct proxy_dev *proxy_dev = filp->private_data; |
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proxy_dev->state |= STATE_OPENED_FLAG; |
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} |
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/** |
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* vtpm_proxy_fops_undo_open - counter-part to vtpm_fops_open |
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* Call to undo vtpm_proxy_fops_open |
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* |
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*@proxy_dev: tpm proxy device |
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*/ |
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static void vtpm_proxy_fops_undo_open(struct proxy_dev *proxy_dev) |
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{ |
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mutex_lock(&proxy_dev->buf_lock); |
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proxy_dev->state &= ~STATE_OPENED_FLAG; |
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mutex_unlock(&proxy_dev->buf_lock); |
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/* no more TPM responses -- wake up anyone waiting for them */ |
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wake_up_interruptible(&proxy_dev->wq); |
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} |
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/* |
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* vtpm_proxy_fops_release - Close 'server side' |
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* |
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* @inode: inode |
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* @filp: file pointer |
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* Return: |
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* Always returns 0. |
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*/ |
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static int vtpm_proxy_fops_release(struct inode *inode, struct file *filp) |
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{ |
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struct proxy_dev *proxy_dev = filp->private_data; |
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filp->private_data = NULL; |
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vtpm_proxy_delete_device(proxy_dev); |
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return 0; |
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} |
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static const struct file_operations vtpm_proxy_fops = { |
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.owner = THIS_MODULE, |
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.llseek = no_llseek, |
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.read = vtpm_proxy_fops_read, |
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.write = vtpm_proxy_fops_write, |
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.poll = vtpm_proxy_fops_poll, |
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.release = vtpm_proxy_fops_release, |
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}; |
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/* |
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* Functions invoked by the core TPM driver to send TPM commands to |
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* 'server side' and receive responses from there. |
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*/ |
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|
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/* |
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* Called when core TPM driver reads TPM responses from 'server side' |
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* |
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* @chip: tpm chip to use |
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* @buf: receive buffer |
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* @count: bytes to read |
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* Return: |
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* Number of TPM response bytes read, negative error value otherwise |
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*/ |
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static int vtpm_proxy_tpm_op_recv(struct tpm_chip *chip, u8 *buf, size_t count) |
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{ |
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struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev); |
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size_t len; |
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/* process gone ? */ |
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mutex_lock(&proxy_dev->buf_lock); |
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if (!(proxy_dev->state & STATE_OPENED_FLAG)) { |
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mutex_unlock(&proxy_dev->buf_lock); |
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return -EPIPE; |
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} |
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len = proxy_dev->resp_len; |
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if (count < len) { |
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dev_err(&chip->dev, |
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"Invalid size in recv: count=%zd, resp_len=%zd\n", |
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count, len); |
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len = -EIO; |
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goto out; |
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} |
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memcpy(buf, proxy_dev->buffer, len); |
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proxy_dev->resp_len = 0; |
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out: |
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mutex_unlock(&proxy_dev->buf_lock); |
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return len; |
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} |
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static int vtpm_proxy_is_driver_command(struct tpm_chip *chip, |
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u8 *buf, size_t count) |
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{ |
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struct tpm_header *hdr = (struct tpm_header *)buf; |
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if (count < sizeof(struct tpm_header)) |
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return 0; |
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if (chip->flags & TPM_CHIP_FLAG_TPM2) { |
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switch (be32_to_cpu(hdr->ordinal)) { |
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case TPM2_CC_SET_LOCALITY: |
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return 1; |
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} |
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} else { |
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switch (be32_to_cpu(hdr->ordinal)) { |
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case TPM_ORD_SET_LOCALITY: |
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return 1; |
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} |
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} |
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return 0; |
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} |
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/* |
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* Called when core TPM driver forwards TPM requests to 'server side'. |
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* |
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* @chip: tpm chip to use |
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* @buf: send buffer |
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* @count: bytes to send |
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* |
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* Return: |
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* 0 in case of success, negative error value otherwise. |
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*/ |
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static int vtpm_proxy_tpm_op_send(struct tpm_chip *chip, u8 *buf, size_t count) |
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{ |
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struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev); |
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if (count > sizeof(proxy_dev->buffer)) { |
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dev_err(&chip->dev, |
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"Invalid size in send: count=%zd, buffer size=%zd\n", |
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count, sizeof(proxy_dev->buffer)); |
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return -EIO; |
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} |
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if (!(proxy_dev->state & STATE_DRIVER_COMMAND) && |
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vtpm_proxy_is_driver_command(chip, buf, count)) |
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return -EFAULT; |
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mutex_lock(&proxy_dev->buf_lock); |
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if (!(proxy_dev->state & STATE_OPENED_FLAG)) { |
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mutex_unlock(&proxy_dev->buf_lock); |
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return -EPIPE; |
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} |
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proxy_dev->resp_len = 0; |
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proxy_dev->req_len = count; |
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memcpy(proxy_dev->buffer, buf, count); |
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proxy_dev->state &= ~STATE_WAIT_RESPONSE_FLAG; |
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mutex_unlock(&proxy_dev->buf_lock); |
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wake_up_interruptible(&proxy_dev->wq); |
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return 0; |
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} |
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static void vtpm_proxy_tpm_op_cancel(struct tpm_chip *chip) |
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{ |
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/* not supported */ |
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} |
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static u8 vtpm_proxy_tpm_op_status(struct tpm_chip *chip) |
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{ |
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struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev); |
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if (proxy_dev->resp_len) |
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return VTPM_PROXY_REQ_COMPLETE_FLAG; |
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return 0; |
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} |
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static bool vtpm_proxy_tpm_req_canceled(struct tpm_chip *chip, u8 status) |
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{ |
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struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev); |
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bool ret; |
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mutex_lock(&proxy_dev->buf_lock); |
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ret = !(proxy_dev->state & STATE_OPENED_FLAG); |
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mutex_unlock(&proxy_dev->buf_lock); |
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return ret; |
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} |
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static int vtpm_proxy_request_locality(struct tpm_chip *chip, int locality) |
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{ |
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struct tpm_buf buf; |
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int rc; |
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const struct tpm_header *header; |
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struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev); |
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if (chip->flags & TPM_CHIP_FLAG_TPM2) |
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rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, |
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TPM2_CC_SET_LOCALITY); |
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else |
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rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, |
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TPM_ORD_SET_LOCALITY); |
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if (rc) |
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return rc; |
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tpm_buf_append_u8(&buf, locality); |
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proxy_dev->state |= STATE_DRIVER_COMMAND; |
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rc = tpm_transmit_cmd(chip, &buf, 0, "attempting to set locality"); |
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proxy_dev->state &= ~STATE_DRIVER_COMMAND; |
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if (rc < 0) { |
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locality = rc; |
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goto out; |
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} |
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header = (const struct tpm_header *)buf.data; |
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rc = be32_to_cpu(header->return_code); |
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if (rc) |
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locality = -1; |
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out: |
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tpm_buf_destroy(&buf); |
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return locality; |
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} |
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static const struct tpm_class_ops vtpm_proxy_tpm_ops = { |
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.flags = TPM_OPS_AUTO_STARTUP, |
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.recv = vtpm_proxy_tpm_op_recv, |
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.send = vtpm_proxy_tpm_op_send, |
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.cancel = vtpm_proxy_tpm_op_cancel, |
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.status = vtpm_proxy_tpm_op_status, |
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.req_complete_mask = VTPM_PROXY_REQ_COMPLETE_FLAG, |
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.req_complete_val = VTPM_PROXY_REQ_COMPLETE_FLAG, |
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.req_canceled = vtpm_proxy_tpm_req_canceled, |
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.request_locality = vtpm_proxy_request_locality, |
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}; |
|
|
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/* |
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* Code related to the startup of the TPM 2 and startup of TPM 1.2 + |
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* retrieval of timeouts and durations. |
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*/ |
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static void vtpm_proxy_work(struct work_struct *work) |
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{ |
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struct proxy_dev *proxy_dev = container_of(work, struct proxy_dev, |
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work); |
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int rc; |
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rc = tpm_chip_register(proxy_dev->chip); |
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if (rc) |
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vtpm_proxy_fops_undo_open(proxy_dev); |
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else |
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proxy_dev->state |= STATE_REGISTERED_FLAG; |
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} |
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|
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/* |
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* vtpm_proxy_work_stop: make sure the work has finished |
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* |
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* This function is useful when user space closed the fd |
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* while the driver still determines timeouts. |
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*/ |
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static void vtpm_proxy_work_stop(struct proxy_dev *proxy_dev) |
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{ |
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vtpm_proxy_fops_undo_open(proxy_dev); |
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flush_work(&proxy_dev->work); |
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} |
|
|
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/* |
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* vtpm_proxy_work_start: Schedule the work for TPM 1.2 & 2 initialization |
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*/ |
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static inline void vtpm_proxy_work_start(struct proxy_dev *proxy_dev) |
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{ |
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queue_work(workqueue, &proxy_dev->work); |
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} |
|
|
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/* |
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* Code related to creation and deletion of device pairs |
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*/ |
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static struct proxy_dev *vtpm_proxy_create_proxy_dev(void) |
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{ |
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struct proxy_dev *proxy_dev; |
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struct tpm_chip *chip; |
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int err; |
|
|
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proxy_dev = kzalloc(sizeof(*proxy_dev), GFP_KERNEL); |
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if (proxy_dev == NULL) |
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return ERR_PTR(-ENOMEM); |
|
|
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init_waitqueue_head(&proxy_dev->wq); |
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mutex_init(&proxy_dev->buf_lock); |
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INIT_WORK(&proxy_dev->work, vtpm_proxy_work); |
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|
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chip = tpm_chip_alloc(NULL, &vtpm_proxy_tpm_ops); |
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if (IS_ERR(chip)) { |
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err = PTR_ERR(chip); |
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goto err_proxy_dev_free; |
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} |
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dev_set_drvdata(&chip->dev, proxy_dev); |
|
|
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proxy_dev->chip = chip; |
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return proxy_dev; |
|
|
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err_proxy_dev_free: |
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kfree(proxy_dev); |
|
|
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return ERR_PTR(err); |
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} |
|
|
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/* |
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* Undo what has been done in vtpm_create_proxy_dev |
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*/ |
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static inline void vtpm_proxy_delete_proxy_dev(struct proxy_dev *proxy_dev) |
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{ |
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put_device(&proxy_dev->chip->dev); /* frees chip */ |
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kfree(proxy_dev); |
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} |
|
|
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/* |
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* Create a /dev/tpm%d and 'server side' file descriptor pair |
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* |
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* Return: |
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* Returns file pointer on success, an error value otherwise |
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*/ |
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static struct file *vtpm_proxy_create_device( |
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struct vtpm_proxy_new_dev *vtpm_new_dev) |
|
{ |
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struct proxy_dev *proxy_dev; |
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int rc, fd; |
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struct file *file; |
|
|
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if (vtpm_new_dev->flags & ~VTPM_PROXY_FLAGS_ALL) |
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return ERR_PTR(-EOPNOTSUPP); |
|
|
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proxy_dev = vtpm_proxy_create_proxy_dev(); |
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if (IS_ERR(proxy_dev)) |
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return ERR_CAST(proxy_dev); |
|
|
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proxy_dev->flags = vtpm_new_dev->flags; |
|
|
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/* setup an anonymous file for the server-side */ |
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fd = get_unused_fd_flags(O_RDWR); |
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if (fd < 0) { |
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rc = fd; |
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goto err_delete_proxy_dev; |
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} |
|
|
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file = anon_inode_getfile("[vtpms]", &vtpm_proxy_fops, proxy_dev, |
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O_RDWR); |
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if (IS_ERR(file)) { |
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rc = PTR_ERR(file); |
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goto err_put_unused_fd; |
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} |
|
|
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/* from now on we can unwind with put_unused_fd() + fput() */ |
|
/* simulate an open() on the server side */ |
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vtpm_proxy_fops_open(file); |
|
|
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if (proxy_dev->flags & VTPM_PROXY_FLAG_TPM2) |
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proxy_dev->chip->flags |= TPM_CHIP_FLAG_TPM2; |
|
|
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vtpm_proxy_work_start(proxy_dev); |
|
|
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vtpm_new_dev->fd = fd; |
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vtpm_new_dev->major = MAJOR(proxy_dev->chip->dev.devt); |
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vtpm_new_dev->minor = MINOR(proxy_dev->chip->dev.devt); |
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vtpm_new_dev->tpm_num = proxy_dev->chip->dev_num; |
|
|
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return file; |
|
|
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err_put_unused_fd: |
|
put_unused_fd(fd); |
|
|
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err_delete_proxy_dev: |
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vtpm_proxy_delete_proxy_dev(proxy_dev); |
|
|
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return ERR_PTR(rc); |
|
} |
|
|
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/* |
|
* Counter part to vtpm_create_device. |
|
*/ |
|
static void vtpm_proxy_delete_device(struct proxy_dev *proxy_dev) |
|
{ |
|
vtpm_proxy_work_stop(proxy_dev); |
|
|
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/* |
|
* A client may hold the 'ops' lock, so let it know that the server |
|
* side shuts down before we try to grab the 'ops' lock when |
|
* unregistering the chip. |
|
*/ |
|
vtpm_proxy_fops_undo_open(proxy_dev); |
|
|
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if (proxy_dev->state & STATE_REGISTERED_FLAG) |
|
tpm_chip_unregister(proxy_dev->chip); |
|
|
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vtpm_proxy_delete_proxy_dev(proxy_dev); |
|
} |
|
|
|
/* |
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* Code related to the control device /dev/vtpmx |
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*/ |
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/** |
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* vtpmx_ioc_new_dev - handler for the %VTPM_PROXY_IOC_NEW_DEV ioctl |
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* @file: /dev/vtpmx |
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* @ioctl: the ioctl number |
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* @arg: pointer to the struct vtpmx_proxy_new_dev |
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* |
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* Creates an anonymous file that is used by the process acting as a TPM to |
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* communicate with the client processes. The function will also add a new TPM |
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* device through which data is proxied to this TPM acting process. The caller |
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* will be provided with a file descriptor to communicate with the clients and |
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* major and minor numbers for the TPM device. |
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*/ |
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static long vtpmx_ioc_new_dev(struct file *file, unsigned int ioctl, |
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unsigned long arg) |
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{ |
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void __user *argp = (void __user *)arg; |
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struct vtpm_proxy_new_dev __user *vtpm_new_dev_p; |
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struct vtpm_proxy_new_dev vtpm_new_dev; |
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struct file *vtpm_file; |
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if (!capable(CAP_SYS_ADMIN)) |
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return -EPERM; |
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vtpm_new_dev_p = argp; |
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if (copy_from_user(&vtpm_new_dev, vtpm_new_dev_p, |
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sizeof(vtpm_new_dev))) |
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return -EFAULT; |
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vtpm_file = vtpm_proxy_create_device(&vtpm_new_dev); |
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if (IS_ERR(vtpm_file)) |
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return PTR_ERR(vtpm_file); |
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if (copy_to_user(vtpm_new_dev_p, &vtpm_new_dev, |
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sizeof(vtpm_new_dev))) { |
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put_unused_fd(vtpm_new_dev.fd); |
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fput(vtpm_file); |
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return -EFAULT; |
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} |
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fd_install(vtpm_new_dev.fd, vtpm_file); |
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return 0; |
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} |
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/* |
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* vtpmx_fops_ioctl: ioctl on /dev/vtpmx |
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* |
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* Return: |
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* Returns 0 on success, a negative error code otherwise. |
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*/ |
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static long vtpmx_fops_ioctl(struct file *f, unsigned int ioctl, |
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unsigned long arg) |
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{ |
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switch (ioctl) { |
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case VTPM_PROXY_IOC_NEW_DEV: |
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return vtpmx_ioc_new_dev(f, ioctl, arg); |
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default: |
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return -ENOIOCTLCMD; |
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} |
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} |
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static const struct file_operations vtpmx_fops = { |
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.owner = THIS_MODULE, |
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.unlocked_ioctl = vtpmx_fops_ioctl, |
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.compat_ioctl = compat_ptr_ioctl, |
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.llseek = noop_llseek, |
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}; |
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static struct miscdevice vtpmx_miscdev = { |
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.minor = MISC_DYNAMIC_MINOR, |
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.name = "vtpmx", |
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.fops = &vtpmx_fops, |
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}; |
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static int vtpmx_init(void) |
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{ |
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return misc_register(&vtpmx_miscdev); |
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} |
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static void vtpmx_cleanup(void) |
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{ |
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misc_deregister(&vtpmx_miscdev); |
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} |
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static int __init vtpm_module_init(void) |
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{ |
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int rc; |
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rc = vtpmx_init(); |
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if (rc) { |
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pr_err("couldn't create vtpmx device\n"); |
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return rc; |
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} |
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workqueue = create_workqueue("tpm-vtpm"); |
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if (!workqueue) { |
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pr_err("couldn't create workqueue\n"); |
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rc = -ENOMEM; |
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goto err_vtpmx_cleanup; |
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} |
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return 0; |
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err_vtpmx_cleanup: |
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vtpmx_cleanup(); |
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return rc; |
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} |
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static void __exit vtpm_module_exit(void) |
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{ |
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destroy_workqueue(workqueue); |
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vtpmx_cleanup(); |
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} |
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module_init(vtpm_module_init); |
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module_exit(vtpm_module_exit); |
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MODULE_AUTHOR("Stefan Berger ([email protected])"); |
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MODULE_DESCRIPTION("vTPM Driver"); |
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MODULE_VERSION("0.1"); |
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MODULE_LICENSE("GPL");
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