Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright (C) 2004 IBM Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Authors:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Leendert van Doorn <leendert@watson.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Dave Safford <safford@watson.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Reiner Sailer <sailer@watson.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * Kylene Hall <kjhall@us.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  * Copyright (C) 2013 Obsidian Research Corp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  * Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  * Device file system interface to the TPM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/poll.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/workqueue.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include "tpm.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include "tpm-dev.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) static struct workqueue_struct *tpm_dev_wq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) static DEFINE_MUTEX(tpm_dev_wq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) static ssize_t tpm_dev_transmit(struct tpm_chip *chip, struct tpm_space *space,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 				u8 *buf, size_t bufsiz)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	struct tpm_header *header = (void *)buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	ssize_t ret, len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	ret = tpm2_prepare_space(chip, space, buf, bufsiz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	/* If the command is not implemented by the TPM, synthesize a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	 * response with a TPM2_RC_COMMAND_CODE return for user-space.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	if (ret == -EOPNOTSUPP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 		header->length = cpu_to_be32(sizeof(*header));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 		header->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 		header->return_code = cpu_to_be32(TPM2_RC_COMMAND_CODE |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 						  TSS2_RESMGR_TPM_RC_LAYER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		ret = sizeof(*header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 		goto out_rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	len = tpm_transmit(chip, buf, bufsiz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	if (len < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 		ret = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 		ret = tpm2_commit_space(chip, space, buf, &len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) out_rc:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	return ret ? ret : len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) static void tpm_dev_async_work(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	struct file_priv *priv =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 			container_of(work, struct file_priv, async_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	ssize_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	mutex_lock(&priv->buffer_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	priv->command_enqueued = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	ret = tpm_try_get_ops(priv->chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		priv->response_length = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	ret = tpm_dev_transmit(priv->chip, priv->space, priv->data_buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 			       sizeof(priv->data_buffer));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	tpm_put_ops(priv->chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	 * If ret is > 0 then tpm_dev_transmit returned the size of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	 * response. If ret is < 0 then tpm_dev_transmit failed and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	 * returned an error code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	if (ret != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		priv->response_length = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		mod_timer(&priv->user_read_timer, jiffies + (120 * HZ));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	mutex_unlock(&priv->buffer_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	wake_up_interruptible(&priv->async_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) static void user_reader_timeout(struct timer_list *t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	struct file_priv *priv = from_timer(priv, t, user_read_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	pr_warn("TPM user space timeout is deprecated (pid=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		task_tgid_nr(current));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	schedule_work(&priv->timeout_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) static void tpm_timeout_work(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	struct file_priv *priv = container_of(work, struct file_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 					      timeout_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	mutex_lock(&priv->buffer_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	priv->response_read = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	priv->response_length = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	memset(priv->data_buffer, 0, sizeof(priv->data_buffer));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	mutex_unlock(&priv->buffer_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	wake_up_interruptible(&priv->async_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) void tpm_common_open(struct file *file, struct tpm_chip *chip,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		     struct file_priv *priv, struct tpm_space *space)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	priv->chip = chip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	priv->space = space;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	priv->response_read = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	mutex_init(&priv->buffer_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	timer_setup(&priv->user_read_timer, user_reader_timeout, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	INIT_WORK(&priv->timeout_work, tpm_timeout_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	INIT_WORK(&priv->async_work, tpm_dev_async_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	init_waitqueue_head(&priv->async_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	file->private_data = priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) ssize_t tpm_common_read(struct file *file, char __user *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 			size_t size, loff_t *off)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	struct file_priv *priv = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	ssize_t ret_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	mutex_lock(&priv->buffer_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	if (priv->response_length) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		priv->response_read = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		ret_size = min_t(ssize_t, size, priv->response_length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		if (ret_size <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 			priv->response_length = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		rc = copy_to_user(buf, priv->data_buffer + *off, ret_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 			memset(priv->data_buffer, 0, TPM_BUFSIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 			priv->response_length = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 			ret_size = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 			memset(priv->data_buffer + *off, 0, ret_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 			priv->response_length -= ret_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 			*off += ret_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	if (!priv->response_length) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		*off = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		del_singleshot_timer_sync(&priv->user_read_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		flush_work(&priv->timeout_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	mutex_unlock(&priv->buffer_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	return ret_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) ssize_t tpm_common_write(struct file *file, const char __user *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 			 size_t size, loff_t *off)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	struct file_priv *priv = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	if (size > TPM_BUFSIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		return -E2BIG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	mutex_lock(&priv->buffer_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	/* Cannot perform a write until the read has cleared either via
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	 * tpm_read or a user_read_timer timeout. This also prevents split
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	 * buffered writes from blocking here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	if ((!priv->response_read && priv->response_length) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	    priv->command_enqueued) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		ret = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	if (copy_from_user(priv->data_buffer, buf, size)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	if (size < 6 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	    size < be32_to_cpu(*((__be32 *)(priv->data_buffer + 2)))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	priv->response_length = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	priv->response_read = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	*off = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	 * If in nonblocking mode schedule an async job to send
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	 * the command return the size.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	 * In case of error the err code will be returned in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	 * the subsequent read call.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	if (file->f_flags & O_NONBLOCK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		priv->command_enqueued = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		queue_work(tpm_dev_wq, &priv->async_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		mutex_unlock(&priv->buffer_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		return size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	/* atomic tpm command send and result receive. We only hold the ops
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	 * lock during this period so that the tpm can be unregistered even if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	 * the char dev is held open.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	if (tpm_try_get_ops(priv->chip)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		ret = -EPIPE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	ret = tpm_dev_transmit(priv->chip, priv->space, priv->data_buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 			       sizeof(priv->data_buffer));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	tpm_put_ops(priv->chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	if (ret > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		priv->response_length = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		mod_timer(&priv->user_read_timer, jiffies + (120 * HZ));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		ret = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	mutex_unlock(&priv->buffer_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) __poll_t tpm_common_poll(struct file *file, poll_table *wait)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	struct file_priv *priv = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	__poll_t mask = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	poll_wait(file, &priv->async_wait, wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	mutex_lock(&priv->buffer_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	 * The response_length indicates if there is still response
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	 * (or part of it) to be consumed. Partial reads decrease it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	 * by the number of bytes read, and write resets it the zero.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	if (priv->response_length)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		mask = EPOLLIN | EPOLLRDNORM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		mask = EPOLLOUT | EPOLLWRNORM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	mutex_unlock(&priv->buffer_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	return mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)  * Called on file close
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) void tpm_common_release(struct file *file, struct file_priv *priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	flush_work(&priv->async_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	del_singleshot_timer_sync(&priv->user_read_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	flush_work(&priv->timeout_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	file->private_data = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	priv->response_length = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) int __init tpm_dev_common_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	tpm_dev_wq = alloc_workqueue("tpm_dev_wq", WQ_MEM_RECLAIM, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	return !tpm_dev_wq ? -ENOMEM : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) void __exit tpm_dev_common_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	if (tpm_dev_wq) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 		destroy_workqueue(tpm_dev_wq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		tpm_dev_wq = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) }