1 // SPDX-License-Identifier: GPL-2.0-only
20 #include "tpm-dev.h"
24 static ssize_t tpm_dev_transmit(struct tpm_chip *chip, struct tpm_space *space,  in tpm_dev_transmit()  argument
30 	ret = tpm2_prepare_space(chip, space, buf, bufsiz);  in tpm_dev_transmit()
32 	 * response with a TPM2_RC_COMMAND_CODE return for user-space.  in tpm_dev_transmit()
34 	if (ret == -EOPNOTSUPP) {  in tpm_dev_transmit()
35 		header->length = cpu_to_be32(sizeof(*header));  in tpm_dev_transmit()
36 		header->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS);  in tpm_dev_transmit()
37 		header->return_code = cpu_to_be32(TPM2_RC_COMMAND_CODE |  in tpm_dev_transmit()
44 	len = tpm_transmit(chip, buf, bufsiz);  in tpm_dev_transmit()
49 		ret = tpm2_commit_space(chip, space, buf, &len);  in tpm_dev_transmit()
61 	mutex_lock(&priv->buffer_mutex);  in tpm_dev_async_work()
62 	priv->command_enqueued = false;  in tpm_dev_async_work()
63 	ret = tpm_try_get_ops(priv->chip);  in tpm_dev_async_work()
65 		priv->response_length = ret;  in tpm_dev_async_work()
69 	ret = tpm_dev_transmit(priv->chip, priv->space, priv->data_buffer,  in tpm_dev_async_work()
70 			       sizeof(priv->data_buffer));  in tpm_dev_async_work()
71 	tpm_put_ops(priv->chip);  in tpm_dev_async_work()
73 		priv->response_length = ret;  in tpm_dev_async_work()
74 		mod_timer(&priv->user_read_timer, jiffies + (120 * HZ));  in tpm_dev_async_work()
77 	mutex_unlock(&priv->buffer_mutex);  in tpm_dev_async_work()
78 	wake_up_interruptible(&priv->async_wait);  in tpm_dev_async_work()
88 	schedule_work(&priv->timeout_work);  in user_reader_timeout()
96 	mutex_lock(&priv->buffer_mutex);  in tpm_timeout_work()
97 	priv->response_read = true;  in tpm_timeout_work()
98 	priv->response_length = 0;  in tpm_timeout_work()
99 	memset(priv->data_buffer, 0, sizeof(priv->data_buffer));  in tpm_timeout_work()
100 	mutex_unlock(&priv->buffer_mutex);  in tpm_timeout_work()
101 	wake_up_interruptible(&priv->async_wait);  in tpm_timeout_work()
104 void tpm_common_open(struct file *file, struct tpm_chip *chip,  in tpm_common_open()  argument
107 	priv->chip = chip;  in tpm_common_open()
108 	priv->space = space;  in tpm_common_open()
109 	priv->response_read = true;  in tpm_common_open()
111 	mutex_init(&priv->buffer_mutex);  in tpm_common_open()
112 	timer_setup(&priv->user_read_timer, user_reader_timeout, 0);  in tpm_common_open()
113 	INIT_WORK(&priv->timeout_work, tpm_timeout_work);  in tpm_common_open()
114 	INIT_WORK(&priv->async_work, tpm_dev_async_work);  in tpm_common_open()
115 	init_waitqueue_head(&priv->async_wait);  in tpm_common_open()
116 	file->private_data = priv;  in tpm_common_open()
120 			size_t size, loff_t *off)  in tpm_common_read()  argument
122 	struct file_priv *priv = file->private_data;  in tpm_common_read()
126 	mutex_lock(&priv->buffer_mutex);  in tpm_common_read()
128 	if (priv->response_length) {  in tpm_common_read()
129 		priv->response_read = true;  in tpm_common_read()
131 		ret_size = min_t(ssize_t, size, priv->response_length);  in tpm_common_read()
133 			priv->response_length = 0;  in tpm_common_read()
137 		rc = copy_to_user(buf, priv->data_buffer + *off, ret_size);  in tpm_common_read()
139 			memset(priv->data_buffer, 0, TPM_BUFSIZE);  in tpm_common_read()
140 			priv->response_length = 0;  in tpm_common_read()
141 			ret_size = -EFAULT;  in tpm_common_read()
143 			memset(priv->data_buffer + *off, 0, ret_size);  in tpm_common_read()
144 			priv->response_length -= ret_size;  in tpm_common_read()
145 			*off += ret_size;  in tpm_common_read()
150 	if (!priv->response_length) {  in tpm_common_read()
151 		*off = 0;  in tpm_common_read()
152 		del_singleshot_timer_sync(&priv->user_read_timer);  in tpm_common_read()
153 		flush_work(&priv->timeout_work);  in tpm_common_read()
155 	mutex_unlock(&priv->buffer_mutex);  in tpm_common_read()
160 			 size_t size, loff_t *off)  in tpm_common_write()  argument
162 	struct file_priv *priv = file->private_data;  in tpm_common_write()
166 		return -E2BIG;  in tpm_common_write()
168 	mutex_lock(&priv->buffer_mutex);  in tpm_common_write()
174 	if ((!priv->response_read && priv->response_length) ||  in tpm_common_write()
175 	    priv->command_enqueued) {  in tpm_common_write()
176 		ret = -EBUSY;  in tpm_common_write()
180 	if (copy_from_user(priv->data_buffer, buf, size)) {  in tpm_common_write()
181 		ret = -EFAULT;  in tpm_common_write()
186 	    size < be32_to_cpu(*((__be32 *)(priv->data_buffer + 2)))) {  in tpm_common_write()
187 		ret = -EINVAL;  in tpm_common_write()
191 	priv->response_length = 0;  in tpm_common_write()
192 	priv->response_read = false;  in tpm_common_write()
193 	*off = 0;  in tpm_common_write()
201 	if (file->f_flags & O_NONBLOCK) {  in tpm_common_write()
202 		priv->command_enqueued = true;  in tpm_common_write()
203 		queue_work(tpm_dev_wq, &priv->async_work);  in tpm_common_write()
204 		mutex_unlock(&priv->buffer_mutex);  in tpm_common_write()
212 	if (tpm_try_get_ops(priv->chip)) {  in tpm_common_write()
213 		ret = -EPIPE;  in tpm_common_write()
217 	ret = tpm_dev_transmit(priv->chip, priv->space, priv->data_buffer,  in tpm_common_write()
218 			       sizeof(priv->data_buffer));  in tpm_common_write()
219 	tpm_put_ops(priv->chip);  in tpm_common_write()
222 		priv->response_length = ret;  in tpm_common_write()
223 		mod_timer(&priv->user_read_timer, jiffies + (120 * HZ));  in tpm_common_write()
227 	mutex_unlock(&priv->buffer_mutex);  in tpm_common_write()
233 	struct file_priv *priv = file->private_data;  in tpm_common_poll()
236 	poll_wait(file, &priv->async_wait, wait);  in tpm_common_poll()
237 	mutex_lock(&priv->buffer_mutex);  in tpm_common_poll()
244 	if (priv->response_length)  in tpm_common_poll()
249 	mutex_unlock(&priv->buffer_mutex);  in tpm_common_poll()
258 	flush_work(&priv->async_work);  in tpm_common_release()
259 	del_singleshot_timer_sync(&priv->user_read_timer);  in tpm_common_release()
260 	flush_work(&priv->timeout_work);  in tpm_common_release()
261 	file->private_data = NULL;  in tpm_common_release()
262 	priv->response_length = 0;  in tpm_common_release()
269 	return !tpm_dev_wq ? -ENOMEM : 0;  in tpm_dev_common_init()