tpm: split out tpm-dev.c into tpm-dev.c and tpm-common-dev.c

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
This commit is contained in:
James Bottomley 2017-01-10 19:08:53 -08:00 committed by Jarkko Sakkinen
parent 745b361e98
commit ecb38e2f52
4 changed files with 190 additions and 130 deletions

View File

@ -3,7 +3,7 @@
#
obj-$(CONFIG_TCG_TPM) += tpm.o
tpm-y := tpm-interface.o tpm-dev.o tpm-sysfs.o tpm-chip.o tpm2-cmd.o \
tpm1_eventlog.o tpm2_eventlog.o tpm2-space.o
tpm-dev-common.o tpm1_eventlog.o tpm2_eventlog.o tpm2-space.o
tpm-$(CONFIG_ACPI) += tpm_ppi.o tpm_acpi.o
tpm-$(CONFIG_OF) += tpm_of.o
obj-$(CONFIG_TCG_TIS_CORE) += tpm_tis_core.o

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@ -0,0 +1,148 @@
/*
* Copyright (C) 2004 IBM Corporation
* Authors:
* Leendert van Doorn <leendert@watson.ibm.com>
* Dave Safford <safford@watson.ibm.com>
* Reiner Sailer <sailer@watson.ibm.com>
* Kylene Hall <kjhall@us.ibm.com>
*
* Copyright (C) 2013 Obsidian Research Corp
* Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
*
* Device file system interface to the TPM
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, version 2 of the
* License.
*
*/
#include <linux/slab.h>
#include <linux/uaccess.h>
#include "tpm.h"
#include "tpm-dev.h"
static void user_reader_timeout(unsigned long ptr)
{
struct file_priv *priv = (struct file_priv *)ptr;
pr_warn("TPM user space timeout is deprecated (pid=%d)\n",
task_tgid_nr(current));
schedule_work(&priv->work);
}
static void timeout_work(struct work_struct *work)
{
struct file_priv *priv = container_of(work, struct file_priv, work);
mutex_lock(&priv->buffer_mutex);
atomic_set(&priv->data_pending, 0);
memset(priv->data_buffer, 0, sizeof(priv->data_buffer));
mutex_unlock(&priv->buffer_mutex);
}
void tpm_common_open(struct file *file, struct tpm_chip *chip,
struct file_priv *priv)
{
priv->chip = chip;
atomic_set(&priv->data_pending, 0);
mutex_init(&priv->buffer_mutex);
setup_timer(&priv->user_read_timer, user_reader_timeout,
(unsigned long)priv);
INIT_WORK(&priv->work, timeout_work);
file->private_data = priv;
}
ssize_t tpm_common_read(struct file *file, char __user *buf,
size_t size, loff_t *off)
{
struct file_priv *priv = file->private_data;
ssize_t ret_size;
ssize_t orig_ret_size;
int rc;
del_singleshot_timer_sync(&priv->user_read_timer);
flush_work(&priv->work);
ret_size = atomic_read(&priv->data_pending);
if (ret_size > 0) { /* relay data */
orig_ret_size = ret_size;
if (size < ret_size)
ret_size = size;
mutex_lock(&priv->buffer_mutex);
rc = copy_to_user(buf, priv->data_buffer, ret_size);
memset(priv->data_buffer, 0, orig_ret_size);
if (rc)
ret_size = -EFAULT;
mutex_unlock(&priv->buffer_mutex);
}
atomic_set(&priv->data_pending, 0);
return ret_size;
}
ssize_t tpm_common_write(struct file *file, const char __user *buf,
size_t size, loff_t *off, struct tpm_space *space)
{
struct file_priv *priv = file->private_data;
size_t in_size = size;
ssize_t out_size;
/* Cannot perform a write until the read has cleared either via
* tpm_read or a user_read_timer timeout. This also prevents split
* buffered writes from blocking here.
*/
if (atomic_read(&priv->data_pending) != 0)
return -EBUSY;
if (in_size > TPM_BUFSIZE)
return -E2BIG;
mutex_lock(&priv->buffer_mutex);
if (copy_from_user
(priv->data_buffer, (void __user *) buf, in_size)) {
mutex_unlock(&priv->buffer_mutex);
return -EFAULT;
}
/* atomic tpm command send and result receive. We only hold the ops
* lock during this period so that the tpm can be unregistered even if
* the char dev is held open.
*/
if (tpm_try_get_ops(priv->chip)) {
mutex_unlock(&priv->buffer_mutex);
return -EPIPE;
}
out_size = tpm_transmit(priv->chip, space, priv->data_buffer,
sizeof(priv->data_buffer), 0);
tpm_put_ops(priv->chip);
if (out_size < 0) {
mutex_unlock(&priv->buffer_mutex);
return out_size;
}
atomic_set(&priv->data_pending, out_size);
mutex_unlock(&priv->buffer_mutex);
/* Set a timeout by which the reader must come claim the result */
mod_timer(&priv->user_read_timer, jiffies + (120 * HZ));
return in_size;
}
/*
* Called on file close
*/
void tpm_common_release(struct file *file, struct file_priv *priv)
{
del_singleshot_timer_sync(&priv->user_read_timer);
flush_work(&priv->work);
file->private_data = NULL;
atomic_set(&priv->data_pending, 0);
}

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@ -18,48 +18,15 @@
*
*/
#include <linux/slab.h>
#include <linux/uaccess.h>
#include "tpm.h"
struct file_priv {
struct tpm_chip *chip;
/* Data passed to and from the tpm via the read/write calls */
atomic_t data_pending;
struct mutex buffer_mutex;
struct timer_list user_read_timer; /* user needs to claim result */
struct work_struct work;
u8 data_buffer[TPM_BUFSIZE];
};
static void user_reader_timeout(unsigned long ptr)
{
struct file_priv *priv = (struct file_priv *)ptr;
pr_warn("TPM user space timeout is deprecated (pid=%d)\n",
task_tgid_nr(current));
schedule_work(&priv->work);
}
static void timeout_work(struct work_struct *work)
{
struct file_priv *priv = container_of(work, struct file_priv, work);
mutex_lock(&priv->buffer_mutex);
atomic_set(&priv->data_pending, 0);
memset(priv->data_buffer, 0, sizeof(priv->data_buffer));
mutex_unlock(&priv->buffer_mutex);
}
#include "tpm-dev.h"
static int tpm_open(struct inode *inode, struct file *file)
{
struct tpm_chip *chip =
container_of(inode->i_cdev, struct tpm_chip, cdev);
struct tpm_chip *chip;
struct file_priv *priv;
chip = container_of(inode->i_cdev, struct tpm_chip, cdev);
/* It's assured that the chip will be opened just once,
* by the check of is_open variable, which is protected
* by driver_lock. */
@ -69,100 +36,22 @@ static int tpm_open(struct inode *inode, struct file *file)
}
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (priv == NULL) {
clear_bit(0, &chip->is_open);
return -ENOMEM;
}
if (priv == NULL)
goto out;
priv->chip = chip;
atomic_set(&priv->data_pending, 0);
mutex_init(&priv->buffer_mutex);
setup_timer(&priv->user_read_timer, user_reader_timeout,
(unsigned long)priv);
INIT_WORK(&priv->work, timeout_work);
tpm_common_open(file, chip, priv);
file->private_data = priv;
return 0;
}
static ssize_t tpm_read(struct file *file, char __user *buf,
size_t size, loff_t *off)
{
struct file_priv *priv = file->private_data;
ssize_t ret_size;
int rc;
del_singleshot_timer_sync(&priv->user_read_timer);
flush_work(&priv->work);
ret_size = atomic_read(&priv->data_pending);
if (ret_size > 0) { /* relay data */
ssize_t orig_ret_size = ret_size;
if (size < ret_size)
ret_size = size;
mutex_lock(&priv->buffer_mutex);
rc = copy_to_user(buf, priv->data_buffer, ret_size);
memset(priv->data_buffer, 0, orig_ret_size);
if (rc)
ret_size = -EFAULT;
mutex_unlock(&priv->buffer_mutex);
}
atomic_set(&priv->data_pending, 0);
return ret_size;
out:
clear_bit(0, &chip->is_open);
return -ENOMEM;
}
static ssize_t tpm_write(struct file *file, const char __user *buf,
size_t size, loff_t *off)
{
struct file_priv *priv = file->private_data;
size_t in_size = size;
ssize_t out_size;
/* cannot perform a write until the read has cleared
either via tpm_read or a user_read_timer timeout.
This also prevents splitted buffered writes from blocking here.
*/
if (atomic_read(&priv->data_pending) != 0)
return -EBUSY;
if (in_size > TPM_BUFSIZE)
return -E2BIG;
mutex_lock(&priv->buffer_mutex);
if (copy_from_user
(priv->data_buffer, (void __user *) buf, in_size)) {
mutex_unlock(&priv->buffer_mutex);
return -EFAULT;
}
/* atomic tpm command send and result receive. We only hold the ops
* lock during this period so that the tpm can be unregistered even if
* the char dev is held open.
*/
if (tpm_try_get_ops(priv->chip)) {
mutex_unlock(&priv->buffer_mutex);
return -EPIPE;
}
out_size = tpm_transmit(priv->chip, NULL, priv->data_buffer,
sizeof(priv->data_buffer), 0);
tpm_put_ops(priv->chip);
if (out_size < 0) {
mutex_unlock(&priv->buffer_mutex);
return out_size;
}
atomic_set(&priv->data_pending, out_size);
mutex_unlock(&priv->buffer_mutex);
/* Set a timeout by which the reader must come claim the result */
mod_timer(&priv->user_read_timer, jiffies + (120 * HZ));
return in_size;
return tpm_common_write(file, buf, size, off, NULL);
}
/*
@ -172,12 +61,10 @@ static int tpm_release(struct inode *inode, struct file *file)
{
struct file_priv *priv = file->private_data;
del_singleshot_timer_sync(&priv->user_read_timer);
flush_work(&priv->work);
file->private_data = NULL;
atomic_set(&priv->data_pending, 0);
tpm_common_release(file, priv);
clear_bit(0, &priv->chip->is_open);
kfree(priv);
return 0;
}
@ -185,9 +72,7 @@ const struct file_operations tpm_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.open = tpm_open,
.read = tpm_read,
.read = tpm_common_read,
.write = tpm_write,
.release = tpm_release,
};

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@ -0,0 +1,27 @@
#ifndef _TPM_DEV_H
#define _TPM_DEV_H
#include "tpm.h"
struct file_priv {
struct tpm_chip *chip;
/* Data passed to and from the tpm via the read/write calls */
atomic_t data_pending;
struct mutex buffer_mutex;
struct timer_list user_read_timer; /* user needs to claim result */
struct work_struct work;
u8 data_buffer[TPM_BUFSIZE];
};
void tpm_common_open(struct file *file, struct tpm_chip *chip,
struct file_priv *priv);
ssize_t tpm_common_read(struct file *file, char __user *buf,
size_t size, loff_t *off);
ssize_t tpm_common_write(struct file *file, const char __user *buf,
size_t size, loff_t *off, struct tpm_space *space);
void tpm_common_release(struct file *file, struct file_priv *priv);
#endif