1 // SPDX-License-Identifier: GPL-2.0-only
8  * Maintained by: <tpmdd-devel@lists.sourceforge.net>
41 #define STATE_DRIVER_COMMAND     BIT(3)  /* sending a driver specific command */
62  * vtpm_proxy_fops_read - Read TPM commands on 'server side'
75 	struct proxy_dev *proxy_dev = filp->private_data;  in vtpm_proxy_fops_read()
79 	sig = wait_event_interruptible(proxy_dev->wq,  in vtpm_proxy_fops_read()
80 		proxy_dev->req_len != 0 ||  in vtpm_proxy_fops_read()
81 		!(proxy_dev->state & STATE_OPENED_FLAG));  in vtpm_proxy_fops_read()
83 		return -EINTR;  in vtpm_proxy_fops_read()
85 	mutex_lock(&proxy_dev->buf_lock);  in vtpm_proxy_fops_read()
87 	if (!(proxy_dev->state & STATE_OPENED_FLAG)) {  in vtpm_proxy_fops_read()
88 		mutex_unlock(&proxy_dev->buf_lock);  in vtpm_proxy_fops_read()
89 		return -EPIPE;  in vtpm_proxy_fops_read()
92 	len = proxy_dev->req_len;  in vtpm_proxy_fops_read()
95 		mutex_unlock(&proxy_dev->buf_lock);  in vtpm_proxy_fops_read()
98 		return -EIO;  in vtpm_proxy_fops_read()
101 	rc = copy_to_user(buf, proxy_dev->buffer, len);  in vtpm_proxy_fops_read()
102 	memset(proxy_dev->buffer, 0, len);  in vtpm_proxy_fops_read()
103 	proxy_dev->req_len = 0;  in vtpm_proxy_fops_read()
106 		proxy_dev->state |= STATE_WAIT_RESPONSE_FLAG;  in vtpm_proxy_fops_read()
108 	mutex_unlock(&proxy_dev->buf_lock);  in vtpm_proxy_fops_read()
111 		return -EFAULT;  in vtpm_proxy_fops_read()
117  * vtpm_proxy_fops_write - Write TPM responses on 'server side'
130 	struct proxy_dev *proxy_dev = filp->private_data;  in vtpm_proxy_fops_write()
132 	mutex_lock(&proxy_dev->buf_lock);  in vtpm_proxy_fops_write()
134 	if (!(proxy_dev->state & STATE_OPENED_FLAG)) {  in vtpm_proxy_fops_write()
135 		mutex_unlock(&proxy_dev->buf_lock);  in vtpm_proxy_fops_write()
136 		return -EPIPE;  in vtpm_proxy_fops_write()
139 	if (count > sizeof(proxy_dev->buffer) ||  in vtpm_proxy_fops_write()
140 	    !(proxy_dev->state & STATE_WAIT_RESPONSE_FLAG)) {  in vtpm_proxy_fops_write()
141 		mutex_unlock(&proxy_dev->buf_lock);  in vtpm_proxy_fops_write()
142 		return -EIO;  in vtpm_proxy_fops_write()
145 	proxy_dev->state &= ~STATE_WAIT_RESPONSE_FLAG;  in vtpm_proxy_fops_write()
147 	proxy_dev->req_len = 0;  in vtpm_proxy_fops_write()
149 	if (copy_from_user(proxy_dev->buffer, buf, count)) {  in vtpm_proxy_fops_write()
150 		mutex_unlock(&proxy_dev->buf_lock);  in vtpm_proxy_fops_write()
151 		return -EFAULT;  in vtpm_proxy_fops_write()
154 	proxy_dev->resp_len = count;  in vtpm_proxy_fops_write()
156 	mutex_unlock(&proxy_dev->buf_lock);  in vtpm_proxy_fops_write()
158 	wake_up_interruptible(&proxy_dev->wq);  in vtpm_proxy_fops_write()
164  * vtpm_proxy_fops_poll - Poll status on 'server side'
173 	struct proxy_dev *proxy_dev = filp->private_data;  in vtpm_proxy_fops_poll()
176 	poll_wait(filp, &proxy_dev->wq, wait);  in vtpm_proxy_fops_poll()
180 	mutex_lock(&proxy_dev->buf_lock);  in vtpm_proxy_fops_poll()
182 	if (proxy_dev->req_len)  in vtpm_proxy_fops_poll()
185 	if (!(proxy_dev->state & STATE_OPENED_FLAG))  in vtpm_proxy_fops_poll()
188 	mutex_unlock(&proxy_dev->buf_lock);  in vtpm_proxy_fops_poll()
194  * vtpm_proxy_fops_open - Open vTPM device on 'server side'
202 	struct proxy_dev *proxy_dev = filp->private_data;  in vtpm_proxy_fops_open()
204 	proxy_dev->state |= STATE_OPENED_FLAG;  in vtpm_proxy_fops_open()
208  * vtpm_proxy_fops_undo_open - counter-part to vtpm_fops_open
215 	mutex_lock(&proxy_dev->buf_lock);  in vtpm_proxy_fops_undo_open()
217 	proxy_dev->state &= ~STATE_OPENED_FLAG;  in vtpm_proxy_fops_undo_open()
219 	mutex_unlock(&proxy_dev->buf_lock);  in vtpm_proxy_fops_undo_open()
221 	/* no more TPM responses -- wake up anyone waiting for them */  in vtpm_proxy_fops_undo_open()
222 	wake_up_interruptible(&proxy_dev->wq);  in vtpm_proxy_fops_undo_open()
226  * vtpm_proxy_fops_release - Close 'server side'
235 	struct proxy_dev *proxy_dev = filp->private_data;  in vtpm_proxy_fops_release()
237 	filp->private_data = NULL;  in vtpm_proxy_fops_release()
269 	struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev);  in vtpm_proxy_tpm_op_recv()
273 	mutex_lock(&proxy_dev->buf_lock);  in vtpm_proxy_tpm_op_recv()
275 	if (!(proxy_dev->state & STATE_OPENED_FLAG)) {  in vtpm_proxy_tpm_op_recv()
276 		mutex_unlock(&proxy_dev->buf_lock);  in vtpm_proxy_tpm_op_recv()
277 		return -EPIPE;  in vtpm_proxy_tpm_op_recv()
280 	len = proxy_dev->resp_len;  in vtpm_proxy_tpm_op_recv()
282 		dev_err(&chip->dev,  in vtpm_proxy_tpm_op_recv()
285 		len = -EIO;  in vtpm_proxy_tpm_op_recv()
289 	memcpy(buf, proxy_dev->buffer, len);  in vtpm_proxy_tpm_op_recv()
290 	proxy_dev->resp_len = 0;  in vtpm_proxy_tpm_op_recv()
293 	mutex_unlock(&proxy_dev->buf_lock);  in vtpm_proxy_tpm_op_recv()
306 	if (chip->flags & TPM_CHIP_FLAG_TPM2) {  in vtpm_proxy_is_driver_command()
307 		switch (be32_to_cpu(hdr->ordinal)) {  in vtpm_proxy_is_driver_command()
312 		switch (be32_to_cpu(hdr->ordinal)) {  in vtpm_proxy_is_driver_command()
332 	struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev);  in vtpm_proxy_tpm_op_send()
334 	if (count > sizeof(proxy_dev->buffer)) {  in vtpm_proxy_tpm_op_send()
335 		dev_err(&chip->dev,  in vtpm_proxy_tpm_op_send()
337 			count, sizeof(proxy_dev->buffer));  in vtpm_proxy_tpm_op_send()
338 		return -EIO;  in vtpm_proxy_tpm_op_send()
341 	if (!(proxy_dev->state & STATE_DRIVER_COMMAND) &&  in vtpm_proxy_tpm_op_send()
343 		return -EFAULT;  in vtpm_proxy_tpm_op_send()
345 	mutex_lock(&proxy_dev->buf_lock);  in vtpm_proxy_tpm_op_send()
347 	if (!(proxy_dev->state & STATE_OPENED_FLAG)) {  in vtpm_proxy_tpm_op_send()
348 		mutex_unlock(&proxy_dev->buf_lock);  in vtpm_proxy_tpm_op_send()
349 		return -EPIPE;  in vtpm_proxy_tpm_op_send()
352 	proxy_dev->resp_len = 0;  in vtpm_proxy_tpm_op_send()
354 	proxy_dev->req_len = count;  in vtpm_proxy_tpm_op_send()
355 	memcpy(proxy_dev->buffer, buf, count);  in vtpm_proxy_tpm_op_send()
357 	proxy_dev->state &= ~STATE_WAIT_RESPONSE_FLAG;  in vtpm_proxy_tpm_op_send()
359 	mutex_unlock(&proxy_dev->buf_lock);  in vtpm_proxy_tpm_op_send()
361 	wake_up_interruptible(&proxy_dev->wq);  in vtpm_proxy_tpm_op_send()
373 	struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev);  in vtpm_proxy_tpm_op_status()
375 	if (proxy_dev->resp_len)  in vtpm_proxy_tpm_op_status()
383 	struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev);  in vtpm_proxy_tpm_req_canceled()
386 	mutex_lock(&proxy_dev->buf_lock);  in vtpm_proxy_tpm_req_canceled()
388 	ret = !(proxy_dev->state & STATE_OPENED_FLAG);  in vtpm_proxy_tpm_req_canceled()
390 	mutex_unlock(&proxy_dev->buf_lock);  in vtpm_proxy_tpm_req_canceled()
395 static int vtpm_proxy_request_locality(struct tpm_chip *chip, int locality)  in vtpm_proxy_request_locality()  argument
400 	struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev);  in vtpm_proxy_request_locality()
402 	if (chip->flags & TPM_CHIP_FLAG_TPM2)  in vtpm_proxy_request_locality()
410 	tpm_buf_append_u8(&buf, locality);  in vtpm_proxy_request_locality()
412 	proxy_dev->state |= STATE_DRIVER_COMMAND;  in vtpm_proxy_request_locality()
414 	rc = tpm_transmit_cmd(chip, &buf, 0, "attempting to set locality");  in vtpm_proxy_request_locality()
416 	proxy_dev->state &= ~STATE_DRIVER_COMMAND;  in vtpm_proxy_request_locality()
419 		locality = rc;  in vtpm_proxy_request_locality()
424 	rc = be32_to_cpu(header->return_code);  in vtpm_proxy_request_locality()
426 		locality = -1;  in vtpm_proxy_request_locality()
431 	return locality;  in vtpm_proxy_request_locality()
457 	rc = tpm_chip_register(proxy_dev->chip);  in vtpm_proxy_work()
461 		proxy_dev->state |= STATE_REGISTERED_FLAG;  in vtpm_proxy_work()
473 	flush_work(&proxy_dev->work);  in vtpm_proxy_work_stop()
481 	queue_work(workqueue, &proxy_dev->work);  in vtpm_proxy_work_start()
495 		return ERR_PTR(-ENOMEM);  in vtpm_proxy_create_proxy_dev()
497 	init_waitqueue_head(&proxy_dev->wq);  in vtpm_proxy_create_proxy_dev()
498 	mutex_init(&proxy_dev->buf_lock);  in vtpm_proxy_create_proxy_dev()
499 	INIT_WORK(&proxy_dev->work, vtpm_proxy_work);  in vtpm_proxy_create_proxy_dev()
506 	dev_set_drvdata(&chip->dev, proxy_dev);  in vtpm_proxy_create_proxy_dev()
508 	proxy_dev->chip = chip;  in vtpm_proxy_create_proxy_dev()
523 	put_device(&proxy_dev->chip->dev); /* frees chip */  in vtpm_proxy_delete_proxy_dev()
540 	if (vtpm_new_dev->flags & ~VTPM_PROXY_FLAGS_ALL)  in vtpm_proxy_create_device()
541 		return ERR_PTR(-EOPNOTSUPP);  in vtpm_proxy_create_device()
547 	proxy_dev->flags = vtpm_new_dev->flags;  in vtpm_proxy_create_device()
549 	/* setup an anonymous file for the server-side */  in vtpm_proxy_create_device()
567 	if (proxy_dev->flags & VTPM_PROXY_FLAG_TPM2)  in vtpm_proxy_create_device()
568 		proxy_dev->chip->flags |= TPM_CHIP_FLAG_TPM2;  in vtpm_proxy_create_device()
572 	vtpm_new_dev->fd = fd;  in vtpm_proxy_create_device()
573 	vtpm_new_dev->major = MAJOR(proxy_dev->chip->dev.devt);  in vtpm_proxy_create_device()
574 	vtpm_new_dev->minor = MINOR(proxy_dev->chip->dev.devt);  in vtpm_proxy_create_device()
575 	vtpm_new_dev->tpm_num = proxy_dev->chip->dev_num;  in vtpm_proxy_create_device()
602 	if (proxy_dev->state & STATE_REGISTERED_FLAG)  in vtpm_proxy_delete_device()
603 		tpm_chip_unregister(proxy_dev->chip);  in vtpm_proxy_delete_device()
613  * vtpmx_ioc_new_dev - handler for the %VTPM_PROXY_IOC_NEW_DEV ioctl
633 		return -EPERM;  in vtpmx_ioc_new_dev()
639 		return -EFAULT;  in vtpmx_ioc_new_dev()
649 		return -EFAULT;  in vtpmx_ioc_new_dev()
669 		return -ENOIOCTLCMD;  in vtpmx_fops_ioctl()
706 	workqueue = create_workqueue("tpm-vtpm");  in vtpm_module_init()
709 		rc = -ENOMEM;  in vtpm_module_init()