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Commit b8d7b758 authored by James Morris's avatar James Morris
Browse files

Merge tag 'tpmdd-next-20181005' of git://git.infradead.org/users/jjs/linux-tpmdd into next-tpm 

tpmdd updates for Linux 4.20

From Jarkko:

These are the updates to v4.20. The only new feature is non-blocking
operation for /dev/tpm0.
parents 2ecefa0a e487a0f5

drivers/char/tpm/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -5,7 +5,7 @@ 
menuconfig TCG_TPM

	tristate "TPM Hardware Support"

	depends on HAS_IOMEM

	select SECURITYFS

	imply SECURITYFS

	select CRYPTO

	select CRYPTO_HASH_INFO

	---help---

drivers/char/tpm/tpm-dev-common.c

+109 −38
Original line number Diff line number Diff line
@@ -17,11 +17,36 @@ 
 * License.

 *

 */

#include <linux/poll.h>

#include <linux/slab.h>

#include <linux/uaccess.h>

#include <linux/workqueue.h>

#include "tpm.h"

#include "tpm-dev.h"



static struct workqueue_struct *tpm_dev_wq;

static DEFINE_MUTEX(tpm_dev_wq_lock);



static void tpm_async_work(struct work_struct *work)

{

	struct file_priv *priv =

			container_of(work, struct file_priv, async_work);

	ssize_t ret;



	mutex_lock(&priv->buffer_mutex);

	priv->command_enqueued = false;

	ret = tpm_transmit(priv->chip, priv->space, priv->data_buffer,

			   sizeof(priv->data_buffer), 0);



	tpm_put_ops(priv->chip);

	if (ret > 0) {

		priv->data_pending = ret;

		mod_timer(&priv->user_read_timer, jiffies + (120 * HZ));

	}

	mutex_unlock(&priv->buffer_mutex);

	wake_up_interruptible(&priv->async_wait);

}



static void user_reader_timeout(struct timer_list *t)

{

	struct file_priv *priv = from_timer(priv, t, user_read_timer);
@@ -29,27 +54,32 @@ static void user_reader_timeout(struct timer_list *t) 
	pr_warn("TPM user space timeout is deprecated (pid=%d)\n",

		task_tgid_nr(current));



	schedule_work(&priv->work);

	schedule_work(&priv->timeout_work);

}



static void timeout_work(struct work_struct *work)

static void tpm_timeout_work(struct work_struct *work)

{

	struct file_priv *priv = container_of(work, struct file_priv, work);

	struct file_priv *priv = container_of(work, struct file_priv,

					      timeout_work);



	mutex_lock(&priv->buffer_mutex);

	priv->data_pending = 0;

	memset(priv->data_buffer, 0, sizeof(priv->data_buffer));

	mutex_unlock(&priv->buffer_mutex);

	wake_up_interruptible(&priv->async_wait);

}



void tpm_common_open(struct file *file, struct tpm_chip *chip,

		     struct file_priv *priv)

		     struct file_priv *priv, struct tpm_space *space)

{

	priv->chip = chip;

	priv->space = space;



	mutex_init(&priv->buffer_mutex);

	timer_setup(&priv->user_read_timer, user_reader_timeout, 0);

	INIT_WORK(&priv->work, timeout_work);



	INIT_WORK(&priv->timeout_work, tpm_timeout_work);

	INIT_WORK(&priv->async_work, tpm_async_work);

	init_waitqueue_head(&priv->async_wait);

	file->private_data = priv;

}
@@ -61,15 +91,17 @@ ssize_t tpm_common_read(struct file *file, char __user *buf, 
	int rc;



	del_singleshot_timer_sync(&priv->user_read_timer);

	flush_work(&priv->work);

	flush_work(&priv->timeout_work);

	mutex_lock(&priv->buffer_mutex);



	if (priv->data_pending) {

		ret_size = min_t(ssize_t, size, priv->data_pending);

		if (ret_size > 0) {

			rc = copy_to_user(buf, priv->data_buffer, ret_size);

			memset(priv->data_buffer, 0, priv->data_pending);

			if (rc)

				ret_size = -EFAULT;

		}



		priv->data_pending = 0;

	}
@@ -79,13 +111,12 @@ ssize_t tpm_common_read(struct file *file, char __user *buf, 
}



ssize_t tpm_common_write(struct file *file, const char __user *buf,

			 size_t size, loff_t *off, struct tpm_space *space)

			 size_t size, loff_t *off)

{

	struct file_priv *priv = file->private_data;

	size_t in_size = size;

	ssize_t out_size;

	int ret = 0;



	if (in_size > TPM_BUFSIZE)

	if (size > TPM_BUFSIZE)

		return -E2BIG;



	mutex_lock(&priv->buffer_mutex);
@@ -94,21 +125,20 @@ ssize_t tpm_common_write(struct file *file, const char __user *buf, 
	 * tpm_read or a user_read_timer timeout. This also prevents split

	 * buffered writes from blocking here.

	 */

	if (priv->data_pending != 0) {

		mutex_unlock(&priv->buffer_mutex);

		return -EBUSY;

	if (priv->data_pending != 0 || priv->command_enqueued) {

		ret = -EBUSY;

		goto out;

	}



	if (copy_from_user

	    (priv->data_buffer, (void __user *) buf, in_size)) {

		mutex_unlock(&priv->buffer_mutex);

		return -EFAULT;

	if (copy_from_user(priv->data_buffer, buf, size)) {

		ret = -EFAULT;

		goto out;

	}



	if (in_size < 6 ||

	    in_size < be32_to_cpu(*((__be32 *) (priv->data_buffer + 2)))) {

		mutex_unlock(&priv->buffer_mutex);

		return -EINVAL;

	if (size < 6 ||

	    size < be32_to_cpu(*((__be32 *)(priv->data_buffer + 2)))) {

		ret = -EINVAL;

		goto out;

	}



	/* atomic tpm command send and result receive. We only hold the ops
@@ -116,25 +146,50 @@ ssize_t tpm_common_write(struct file *file, const char __user *buf, 
	 * the char dev is held open.

	 */

	if (tpm_try_get_ops(priv->chip)) {

		ret = -EPIPE;

		goto out;

	}



	/*

	 * If in nonblocking mode schedule an async job to send

	 * the command return the size.

	 * In case of error the err code will be returned in

	 * the subsequent read call.

	 */

	if (file->f_flags & O_NONBLOCK) {

		priv->command_enqueued = true;

		queue_work(tpm_dev_wq, &priv->async_work);

		mutex_unlock(&priv->buffer_mutex);

		return -EPIPE;

		return size;

	}

	out_size = tpm_transmit(priv->chip, space, priv->data_buffer,

				sizeof(priv->data_buffer), 0);



	ret = tpm_transmit(priv->chip, priv->space, priv->data_buffer,

			   sizeof(priv->data_buffer), 0);

	tpm_put_ops(priv->chip);

	if (out_size < 0) {



	if (ret > 0) {

		priv->data_pending = ret;

		mod_timer(&priv->user_read_timer, jiffies + (120 * HZ));

		ret = size;

	}

out:

	mutex_unlock(&priv->buffer_mutex);

		return out_size;

	return ret;

}



	priv->data_pending = out_size;

	mutex_unlock(&priv->buffer_mutex);

__poll_t tpm_common_poll(struct file *file, poll_table *wait)

{

	struct file_priv *priv = file->private_data;

	__poll_t mask = 0;



	/* Set a timeout by which the reader must come claim the result */

	mod_timer(&priv->user_read_timer, jiffies + (120 * HZ));

	poll_wait(file, &priv->async_wait, wait);



	if (priv->data_pending)

		mask = EPOLLIN | EPOLLRDNORM;

	else

		mask = EPOLLOUT | EPOLLWRNORM;



	return in_size;

	return mask;

}



/*
@@ -142,8 +197,24 @@ ssize_t tpm_common_write(struct file *file, const char __user *buf, 
 */

void tpm_common_release(struct file *file, struct file_priv *priv)

{

	flush_work(&priv->async_work);

	del_singleshot_timer_sync(&priv->user_read_timer);

	flush_work(&priv->work);

	flush_work(&priv->timeout_work);

	file->private_data = NULL;

	priv->data_pending = 0;

}



int __init tpm_dev_common_init(void)

{

	tpm_dev_wq = alloc_workqueue("tpm_dev_wq", WQ_MEM_RECLAIM, 0);



	return !tpm_dev_wq ? -ENOMEM : 0;

}



void __exit tpm_dev_common_exit(void)

{

	if (tpm_dev_wq) {

		destroy_workqueue(tpm_dev_wq);

		tpm_dev_wq = NULL;

	}

}

drivers/char/tpm/tpm-dev.c

+3 −8
Original line number Diff line number Diff line
@@ -39,7 +39,7 @@ static int tpm_open(struct inode *inode, struct file *file) 
	if (priv == NULL)

		goto out;



	tpm_common_open(file, chip, priv);

	tpm_common_open(file, chip, priv, NULL);



	return 0;
@@ -48,12 +48,6 @@ static int tpm_open(struct inode *inode, struct file *file) 
	return -ENOMEM;

}



static ssize_t tpm_write(struct file *file, const char __user *buf,

			 size_t size, loff_t *off)

{

	return tpm_common_write(file, buf, size, off, NULL);

}



/*

 * Called on file close

 */
@@ -73,6 +67,7 @@ const struct file_operations tpm_fops = { 
	.llseek = no_llseek,

	.open = tpm_open,

	.read = tpm_common_read,

	.write = tpm_write,

	.write = tpm_common_write,

	.poll = tpm_common_poll,

	.release = tpm_release,

};

drivers/char/tpm/tpm-dev.h

+12 −6
Original line number Diff line number Diff line
@@ -2,27 +2,33 @@ 
#ifndef _TPM_DEV_H

#define _TPM_DEV_H



#include <linux/poll.h>

#include "tpm.h"



struct file_priv {

	struct tpm_chip *chip;

	struct tpm_space *space;



	/* Data passed to and from the tpm via the read/write calls */

	size_t data_pending;

	/* Holds the amount of data passed or an error code from async op */

	ssize_t data_pending;

	struct mutex buffer_mutex;



	struct timer_list user_read_timer;      /* user needs to claim result */

	struct work_struct work;

	struct work_struct timeout_work;

	struct work_struct async_work;

	wait_queue_head_t async_wait;

	bool command_enqueued;



	u8 data_buffer[TPM_BUFSIZE];

};



void tpm_common_open(struct file *file, struct tpm_chip *chip,

		     struct file_priv *priv);

		     struct file_priv *priv, struct tpm_space *space);

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);

			 size_t size, loff_t *off);

__poll_t tpm_common_poll(struct file *file, poll_table *wait);



void tpm_common_release(struct file *file, struct file_priv *priv);

#endif

drivers/char/tpm/tpm-interface.c

+23 −7
Original line number Diff line number Diff line
@@ -663,7 +663,8 @@ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_space *space, 
		return len;



	err = be32_to_cpu(header->return_code);

	if (err != 0 && desc)

	if (err != 0 && err != TPM_ERR_DISABLED && err != TPM_ERR_DEACTIVATED

	    && desc)

		dev_err(&chip->dev, "A TPM error (%d) occurred %s\n", err,

			desc);

	if (err)
@@ -1321,7 +1322,8 @@ int tpm_get_random(struct tpm_chip *chip, u8 *out, size_t max) 
		}



		rlength = be32_to_cpu(tpm_cmd.header.out.length);

		if (rlength < offsetof(struct tpm_getrandom_out, rng_data) +

		if (rlength < TPM_HEADER_SIZE +

			      offsetof(struct tpm_getrandom_out, rng_data) +

			      recd) {

			total = -EFAULT;

			break;
@@ -1407,19 +1409,32 @@ static int __init tpm_init(void) 
	tpmrm_class = class_create(THIS_MODULE, "tpmrm");

	if (IS_ERR(tpmrm_class)) {

		pr_err("couldn't create tpmrm class\n");

		class_destroy(tpm_class);

		return PTR_ERR(tpmrm_class);

		rc = PTR_ERR(tpmrm_class);

		goto out_destroy_tpm_class;

	}



	rc = alloc_chrdev_region(&tpm_devt, 0, 2*TPM_NUM_DEVICES, "tpm");

	if (rc < 0) {

		pr_err("tpm: failed to allocate char dev region\n");

		class_destroy(tpmrm_class);

		class_destroy(tpm_class);

		return rc;

		goto out_destroy_tpmrm_class;

	}



	rc = tpm_dev_common_init();

	if (rc) {

		pr_err("tpm: failed to allocate char dev region\n");

		goto out_unreg_chrdev;

	}



	return 0;



out_unreg_chrdev:

	unregister_chrdev_region(tpm_devt, 2 * TPM_NUM_DEVICES);

out_destroy_tpmrm_class:

	class_destroy(tpmrm_class);

out_destroy_tpm_class:

	class_destroy(tpm_class);



	return rc;

}



static void __exit tpm_exit(void)
@@ -1428,6 +1443,7 @@ static void __exit tpm_exit(void) 
	class_destroy(tpm_class);

	class_destroy(tpmrm_class);

	unregister_chrdev_region(tpm_devt, 2*TPM_NUM_DEVICES);

	tpm_dev_common_exit();

}



subsys_initcall(tpm_init);