add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/thunderbolt/domain.c
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..
@@ -1,16 +1,15 @@
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+// SPDX-License-Identifier: GPL-2.0
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 /*
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  * Thunderbolt bus support
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  *
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  * Copyright (C) 2017, Intel Corporation
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- * Author:  Mika Westerberg <mika.westerberg@linux.intel.com>
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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+ * Author: Mika Westerberg <mika.westerberg@linux.intel.com>
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  */
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8
 
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 #include <linux/device.h>
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+#include <linux/dmar.h>
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 #include <linux/idr.h>
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+#include <linux/iommu.h>
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 #include <linux/module.h>
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 #include <linux/pm_runtime.h>
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 #include <linux/slab.h>
..
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@@ -148,10 +147,10 @@
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 	for (ret = 0, i = 0; i < tb->nboot_acl; i++) {
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 		if (!uuid_is_null(&uuids[i]))
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-			ret += snprintf(buf + ret, PAGE_SIZE - ret, "%pUb",
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+			ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%pUb",
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 					&uuids[i]);
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-		ret += snprintf(buf + ret, PAGE_SIZE - ret, "%s",
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+		ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s",
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 			       i < tb->nboot_acl - 1 ? "," : "\n");
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 	}
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..
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@@ -239,6 +238,20 @@
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 }
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 static DEVICE_ATTR_RW(boot_acl);
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+static ssize_t iommu_dma_protection_show(struct device *dev,
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+					 struct device_attribute *attr,
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+					 char *buf)
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+{
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+	/*
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+	 * Kernel DMA protection is a feature where Thunderbolt security is
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+	 * handled natively using IOMMU. It is enabled when IOMMU is
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+	 * enabled and ACPI DMAR table has DMAR_PLATFORM_OPT_IN set.
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+	 */
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+	return sprintf(buf, "%d\n",
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+		       iommu_present(&pci_bus_type) && dmar_platform_optin());
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+}
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+static DEVICE_ATTR_RO(iommu_dma_protection);
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+
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 static ssize_t security_show(struct device *dev, struct device_attribute *attr,
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 			     char *buf)
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 {
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@@ -254,6 +267,7 @@
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 static struct attribute *domain_attrs[] = {
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 	&dev_attr_boot_acl.attr,
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+	&dev_attr_iommu_dma_protection.attr,
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 	&dev_attr_security.attr,
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 	NULL,
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 };
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@@ -261,7 +275,7 @@
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 static umode_t domain_attr_is_visible(struct kobject *kobj,
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 				      struct attribute *attr, int n)
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 {
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-	struct device *dev = container_of(kobj, struct device, kobj);
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+	struct device *dev = kobj_to_dev(kobj);
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 	struct tb *tb = container_of(dev, struct tb, dev);
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 	if (attr == &dev_attr_boot_acl.attr) {
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@@ -441,6 +455,8 @@
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 	/* This starts event processing */
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 	mutex_unlock(&tb->lock);
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457
 
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+	device_init_wakeup(&tb->dev, true);
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+
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 	pm_runtime_no_callbacks(&tb->dev);
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 	pm_runtime_set_active(&tb->dev);
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 	pm_runtime_enable(&tb->dev);
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@@ -528,6 +544,33 @@
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 int tb_domain_suspend(struct tb *tb)
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 {
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 	return tb->cm_ops->suspend ? tb->cm_ops->suspend(tb) : 0;
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+}
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+
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+int tb_domain_freeze_noirq(struct tb *tb)
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+{
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+	int ret = 0;
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+
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+	mutex_lock(&tb->lock);
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+	if (tb->cm_ops->freeze_noirq)
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+		ret = tb->cm_ops->freeze_noirq(tb);
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+	if (!ret)
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+		tb_ctl_stop(tb->ctl);
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+	mutex_unlock(&tb->lock);
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+
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+	return ret;
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+}
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+
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+int tb_domain_thaw_noirq(struct tb *tb)
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+{
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+	int ret = 0;
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+
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+	mutex_lock(&tb->lock);
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+	tb_ctl_start(tb->ctl);
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+	if (tb->cm_ops->thaw_noirq)
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+		ret = tb->cm_ops->thaw_noirq(tb);
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+	mutex_unlock(&tb->lock);
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+
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+	return ret;
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 }
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 void tb_domain_complete(struct tb *tb)
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@@ -664,7 +707,6 @@
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 	}
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 	shash->tfm = tfm;
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-	shash->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
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 	memset(hmac, 0, sizeof(hmac));
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 	ret = crypto_shash_digest(shash, challenge, sizeof(hmac), hmac);
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@@ -785,12 +827,23 @@
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 {
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 	int ret;
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+	tb_test_init();
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+
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+	tb_debugfs_init();
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 	ret = tb_xdomain_init();
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 	if (ret)
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-		return ret;
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+		goto err_debugfs;
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 	ret = bus_register(&tb_bus_type);
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 	if (ret)
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-		tb_xdomain_exit();
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+		goto err_xdomain;
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+
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+	return 0;
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+
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+err_xdomain:
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+	tb_xdomain_exit();
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+err_debugfs:
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+	tb_debugfs_exit();
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+	tb_test_exit();
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 	return ret;
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 }
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@@ -799,6 +852,8 @@
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 {
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 	bus_unregister(&tb_bus_type);
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 	ida_destroy(&tb_domain_ida);
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-	tb_switch_exit();
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+	tb_nvm_exit();
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 	tb_xdomain_exit();
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+	tb_debugfs_exit();
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+	tb_test_exit();
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 }