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Message-Id: <1457545170-30120-10-git-send-email-stefanb@linux.vnet.ibm.com>
Date: Wed, 9 Mar 2016 12:39:28 -0500
From: Stefan Berger <stefanb@...ux.vnet.ibm.com>
To: tpmdd-devel@...ts.sourceforge.net
Cc: jarkko.sakkinen@...ux.intel.com, jgunthorpe@...idianresearch.com,
Stefan Berger <stefanb@...ux.vnet.ibm.com>,
linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
linux-api@...r.kernel.org
Subject: [PATCH v6 09/11] tpm: Initialize TPM and get durations and timeouts
Add the retrieval of TPM 1.2 durations and timeouts. Since this requires
the startup of the TPM, do this for TPM 1.2 and TPM 2.
Signed-off-by: Stefan Berger <stefanb@...ux.vnet.ibm.com>
CC: linux-kernel@...r.kernel.org
CC: linux-doc@...r.kernel.org
CC: linux-api@...r.kernel.org
---
drivers/char/tpm/tpm_vtpm.c | 94 ++++++++++++++++++++++++++++++++++++++++-----
1 file changed, 85 insertions(+), 9 deletions(-)
diff --git a/drivers/char/tpm/tpm_vtpm.c b/drivers/char/tpm/tpm_vtpm.c
index 0da311b..4f75248 100644
--- a/drivers/char/tpm/tpm_vtpm.c
+++ b/drivers/char/tpm/tpm_vtpm.c
@@ -45,8 +45,11 @@ struct vtpm_dev {
size_t req_len; /* length of queued TPM request */
size_t resp_len; /* length of queued TPM response */
u8 buffer[TPM_BUFSIZE]; /* request/response buffer */
+
+ struct work_struct work; /* task that retrieves TPM timeouts */
};
+static struct workqueue_struct *workqueue;
static void vtpm_delete_device(struct vtpm_dev *vtpm_dev);
@@ -67,6 +70,15 @@ static ssize_t vtpm_fops_read(struct file *filp, char __user *buf,
size_t len;
int sig, rc;
+ mutex_lock(&vtpm_dev->buf_lock);
+
+ if (!(vtpm_dev->state & STATE_OPENED_FLAG)) {
+ mutex_unlock(&vtpm_dev->buf_lock);
+ return -EPIPE;
+ }
+
+ mutex_unlock(&vtpm_dev->buf_lock);
+
sig = wait_event_interruptible(vtpm_dev->wq, vtpm_dev->req_len != 0);
if (sig)
return -EINTR;
@@ -110,6 +122,11 @@ static ssize_t vtpm_fops_write(struct file *filp, const char __user *buf,
mutex_lock(&vtpm_dev->buf_lock);
+ if (!(vtpm_dev->state & STATE_OPENED_FLAG)) {
+ mutex_unlock(&vtpm_dev->buf_lock);
+ return -EPIPE;
+ }
+
if (count > sizeof(vtpm_dev->buffer) ||
!(vtpm_dev->state & STATE_WAIT_RESPONSE_FLAG)) {
mutex_unlock(&vtpm_dev->buf_lock);
@@ -154,6 +171,9 @@ static unsigned int vtpm_fops_poll(struct file *filp, poll_table *wait)
if (vtpm_dev->req_len)
ret |= POLLIN | POLLRDNORM;
+ if (!(vtpm_dev->state & STATE_OPENED_FLAG))
+ ret |= POLLHUP;
+
mutex_unlock(&vtpm_dev->buf_lock);
return ret;
@@ -341,6 +361,54 @@ static const struct tpm_class_ops vtpm_tpm_ops = {
};
/*
+ * Code related to the startup of the TPM 2 and startup of TPM 1.2 +
+ * retrieval of timeouts and durations.
+ */
+
+static void vtpm_dev_work(struct work_struct *work)
+{
+ struct vtpm_dev *vtpm_dev = container_of(work, struct vtpm_dev, work);
+ int rc;
+
+ if (vtpm_dev->flags & VTPM_FLAG_TPM2)
+ rc = tpm2_startup(vtpm_dev->chip, TPM2_SU_CLEAR);
+ else
+ rc = tpm_get_timeouts(vtpm_dev->chip);
+
+ if (rc)
+ goto err;
+
+ rc = tpm_chip_register(vtpm_dev->chip);
+ if (rc)
+ goto err;
+
+ return;
+
+err:
+ vtpm_fops_undo_open(vtpm_dev);
+}
+
+/*
+ * vtpm_dev_work_stop: make sure the work has finished
+ *
+ * This function is useful when user space closed the fd
+ * while the driver still determines timeouts.
+ */
+static void vtpm_dev_work_stop(struct vtpm_dev *vtpm_dev)
+{
+ vtpm_fops_undo_open(vtpm_dev);
+ flush_work(&vtpm_dev->work);
+}
+
+/*
+ * vtpm_dev_work_start: Schedule the work for TPM 1.2 & 2 initialization
+ */
+static inline void vtpm_dev_work_start(struct vtpm_dev *vtpm_dev)
+{
+ queue_work(workqueue, &vtpm_dev->work);
+}
+
+/*
* Code related to creation and deletion of device pairs
*/
static struct vtpm_dev *vtpm_create_vtpm_dev(void)
@@ -355,6 +423,7 @@ static struct vtpm_dev *vtpm_create_vtpm_dev(void)
init_waitqueue_head(&vtpm_dev->wq);
mutex_init(&vtpm_dev->buf_lock);
+ INIT_WORK(&vtpm_dev->work, vtpm_dev_work);
chip = tpm_chip_alloc(NULL, &vtpm_tpm_ops);
if (IS_ERR(chip)) {
@@ -424,9 +493,7 @@ static struct file *vtpm_create_device(
if (vtpm_dev->flags & VTPM_FLAG_TPM2)
vtpm_dev->chip->flags |= TPM_CHIP_FLAG_TPM2;
- rc = tpm_chip_register(vtpm_dev->chip);
- if (rc)
- goto err_vtpm_fput;
+ vtpm_dev_work_start(vtpm_dev);
vtpm_new_dev->fd = fd;
vtpm_new_dev->major = MAJOR(vtpm_dev->chip->dev.devt);
@@ -435,12 +502,6 @@ static struct file *vtpm_create_device(
return file;
-err_vtpm_fput:
- put_unused_fd(fd);
- fput(file);
-
- return ERR_PTR(rc);
-
err_put_unused_fd:
put_unused_fd(fd);
@@ -455,6 +516,8 @@ err_delete_vtpm_dev:
*/
static void vtpm_delete_device(struct vtpm_dev *vtpm_dev)
{
+ vtpm_dev_work_stop(vtpm_dev);
+
tpm_chip_unregister(vtpm_dev->chip);
vtpm_fops_undo_open(vtpm_dev);
@@ -549,11 +612,24 @@ static int __init vtpm_module_init(void)
return rc;
}
+ workqueue = create_workqueue("tpm-vtpm");
+ if (!workqueue) {
+ pr_err("couldn't create workqueue\n");
+ rc = -ENOMEM;
+ goto err_vtpmx_cleanup;
+ }
+
return 0;
+
+err_vtpmx_cleanup:
+ vtpmx_cleanup();
+
+ return rc;
}
static void __exit vtpm_module_exit(void)
{
+ destroy_workqueue(workqueue);
vtpmx_cleanup();
}
--
2.4.3
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