Merge tag 'thunderbolt-for-v5.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt into usb-next

Mika writes:

thunderbolt: Changes for v5.12 merge window

This includes following Thunderbolt/USB4 changes for v5.12 merge
window:

* Start lane initialization after sleep for Thunderbolt 3 compatible
devices

* Add support for de-authorizing PCIe tunnels (software based
connection manager only)

* Add support for new ACPI 6.4 USB4 _OSC

* Allow disabling XDomain protocol

* Add support for new SL5 security level

* Clean up kernel-docs to pass W=1 builds

* A couple of cleanups and minor fixes

All these have been in linux-next without reported issues.

* tag 'thunderbolt-for-v5.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt: (27 commits)
thunderbolt: Add support for native USB4 _OSC
ACPI: Add support for native USB4 control _OSC
ACPI: Execute platform _OSC also with query bit clear
thunderbolt: Allow disabling XDomain protocol
thunderbolt: Add support for PCIe tunneling disabled (SL5)
thunderbolt: dma_test: Drop unnecessary include
thunderbolt: Add clarifying comments about USB4 terms router and adapter
thunderbolt: switch: Fix kernel-doc descriptions of non-static functions
thunderbolt: nhi: Fix kernel-doc descriptions of non-static functions
thunderbolt: path: Fix kernel-doc descriptions of non-static functions
thunderbolt: eeprom: Fix kernel-doc descriptions of non-static functions
thunderbolt: ctl: Fix kernel-doc descriptions of non-static functions
thunderbolt: switch: Fix function name in the header
thunderbolt: tunnel: Fix misspelling of 'receive_path'
thunderbolt: icm: Fix a couple of formatting issues
thunderbolt: switch: Demote a bunch of non-conformant kernel-doc headers
thunderbolt: tb: Kernel-doc function headers should document their parameters
thunderbolt: nhi: Demote some non-conformant kernel-doc headers
thunderbolt: xdomain: Fix 'tb_unregister_service_driver()'s 'drv' param
thunderbolt: eeprom: Demote non-conformant kernel-doc headers to standard comment blocks
...

Documentation/ABI/testing/sysfs-bus-thunderbolt

···
 		If a device is authorized automatically during boot its
 		boot attribute is set to 1.
 
+What: /sys/bus/thunderbolt/devices/.../domainX/deauthorization
+Date:		May 2021
+KernelVersion:	5.12
+Contact:	Mika Westerberg <[e-mail]>
+Description:	This attribute tells whether the system supports
+		de-authorization of devices. Value of 1 means user can
+		de-authorize PCIe tunnel by writing 0 to authorized
+		attribute under each device.
+
 What: /sys/bus/thunderbolt/devices/.../domainX/iommu_dma_protection
 Date:		Mar 2019
 KernelVersion:	4.21
···
 		usbonly  Automatically tunnel USB controller of the
 			 connected Thunderbolt dock (and Display Port). All
 			 PCIe links downstream of the dock are removed.
+		nopcie   USB4 system where PCIe tunneling is disabled from
+			 the BIOS.
 		=======  ==================================================
 
 What: /sys/bus/thunderbolt/devices/.../authorized
···
 Contact:	[e-mail]
 Description:	This attribute is used to authorize Thunderbolt devices
 		after they have been connected. If the device is not
-		authorized, no devices such as PCIe and Display port are
-		available to the system.
+		authorized, no PCIe devices are available to the system.
 
 		Contents of this attribute will be 0 when the device is not
 		yet authorized.
 
 		Possible values are supported:
 
-		==  ===========================================
+		==  ===================================================
+		0   The device will be de-authorized (only supported if
+		    deauthorization attribute under domain contains 1)
 		1   The device will be authorized and connected
-		==  ===========================================
+		==  ===================================================
 
 		When key attribute contains 32 byte hex string the possible
 		values are:
 
 		==  ========================================================
+		0   The device will be de-authorized (only supported if
+		    deauthorization attribute under domain contains 1)
 		1   The 32 byte hex string is added to the device NVM and
 		    the device is authorized.
 		2   Send a challenge based on the 32 byte hex string. If the

Documentation/admin-guide/thunderbolt.rst

···
 knowing about it. There are ways to prevent this by setting up an IOMMU but
 it is not always available for various reasons.
 
+Some USB4 systems have a BIOS setting to disable PCIe tunneling. This is
+treated as another security level (nopcie).
+
 The security levels are as follows:
 
   none
···
     The firmware automatically creates tunnels for the USB controller and
     Display Port in a dock. All PCIe links downstream of the dock are
     removed.
+
+  nopcie
+    PCIe tunneling is disabled/forbidden from the BIOS. Available in some
+    USB4 systems.
 
 The current security level can be read from
 ``/sys/bus/thunderbolt/devices/domainX/security`` where ``domainX`` is
···
 If the user still wants to connect the device they can either approve
 the device without a key or write a new key and write 1 to the
 ``authorized`` file to get the new key stored on the device NVM.
+
+De-authorizing devices
+----------------------
+It is possible to de-authorize devices by writing ``0`` to their
+``authorized`` attribute. This requires support from the connection
+manager implementation and can be checked by reading domain
+``deauthorization`` attribute. If it reads ``1`` then the feature is
+supported.
+
+When a device is de-authorized the PCIe tunnel from the parent device
+PCIe downstream (or root) port to the device PCIe upstream port is torn
+down. This is essentially the same thing as PCIe hot-remove and the PCIe
+toplogy in question will not be accessible anymore until the device is
+authorized again. If there is storage such as NVMe or similar involved,
+there is a risk for data loss if the filesystem on that storage is not
+properly shut down. You have been warned!
 
 DMA protection utilizing IOMMU
 ------------------------------

drivers/acpi/bus.c

···
 bool osc_pc_lpi_support_confirmed;
 EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
 
+/*
+ * ACPI 6.4 Operating System Capabilities for USB.
+ */
+bool osc_sb_native_usb4_support_confirmed;
+EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed);
+
 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
-static void acpi_bus_osc_support(void)
+static void acpi_bus_osc_negotiate_platform_control(void)
 {
-	u32 capbuf[2];
+	u32 capbuf[2], *capbuf_ret;
 	struct acpi_osc_context context = {
 		.uuid_str = sb_uuid_str,
 		.rev = 1,
···
 	if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
 		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
 
+	if (IS_ENABLED(CONFIG_USB4))
+		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_NATIVE_USB4_SUPPORT;
+
 	if (!ghes_disable)
 		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
 	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 		return;
-	if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
-		u32 *capbuf_ret = context.ret.pointer;
-		if (context.ret.length > OSC_SUPPORT_DWORD) {
-			osc_sb_apei_support_acked =
-				capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
-			osc_pc_lpi_support_confirmed =
-				capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
-		}
+
+	if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
+		return;
+
+	capbuf_ret = context.ret.pointer;
+	if (context.ret.length <= OSC_SUPPORT_DWORD) {
 		kfree(context.ret.pointer);
+		return;
 	}
-	/* do we need to check other returned cap? Sounds no */
+
+	/*
+	 * Now run _OSC again with query flag clear and with the caps
+	 * supported by both the OS and the platform.
+	 */
+	capbuf[OSC_QUERY_DWORD] = 0;
+	capbuf[OSC_SUPPORT_DWORD] = capbuf_ret[OSC_SUPPORT_DWORD];
+	kfree(context.ret.pointer);
+
+	if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
+		return;
+
+	capbuf_ret = context.ret.pointer;
+	if (context.ret.length > OSC_SUPPORT_DWORD) {
+		osc_sb_apei_support_acked =
+			capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
+		osc_pc_lpi_support_confirmed =
+			capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
+		osc_sb_native_usb4_support_confirmed =
+			capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT;
+	}
+
+	kfree(context.ret.pointer);
+}
+
+/*
+ * Native control of USB4 capabilities. If any of the tunneling bits is
+ * set it means OS is in control and we use software based connection
+ * manager.
+ */
+u32 osc_sb_native_usb4_control;
+EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control);
+
+static void acpi_bus_decode_usb_osc(const char *msg, u32 bits)
+{
+	printk(KERN_INFO PREFIX "%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg,
+	       (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-',
+	       (bits & OSC_USB_DP_TUNNELING) ? '+' : '-',
+	       (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-',
+	       (bits & OSC_USB_XDOMAIN) ? '+' : '-');
+}
+
+static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A";
+static void acpi_bus_osc_negotiate_usb_control(void)
+{
+	u32 capbuf[3];
+	struct acpi_osc_context context = {
+		.uuid_str = sb_usb_uuid_str,
+		.rev = 1,
+		.cap.length = sizeof(capbuf),
+		.cap.pointer = capbuf,
+	};
+	acpi_handle handle;
+	acpi_status status;
+	u32 control;
+
+	if (!osc_sb_native_usb4_support_confirmed)
+		return;
+
+	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
+		return;
+
+	control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING |
+		  OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN;
+
+	capbuf[OSC_QUERY_DWORD] = 0;
+	capbuf[OSC_SUPPORT_DWORD] = 0;
+	capbuf[OSC_CONTROL_DWORD] = control;
+
+	status = acpi_run_osc(handle, &context);
+	if (ACPI_FAILURE(status))
+		return;
+
+	if (context.ret.length != sizeof(capbuf)) {
+		printk(KERN_INFO PREFIX "USB4 _OSC: returned invalid length buffer\n");
+		goto out_free;
+	}
+
+	osc_sb_native_usb4_control =
+		control & ((u32 *)context.ret.pointer)[OSC_CONTROL_DWORD];
+
+	acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control);
+	acpi_bus_decode_usb_osc("USB4 _OSC: OS controls",
+				osc_sb_native_usb4_control);
+
+out_free:
+	kfree(context.ret.pointer);
 }
 
 /* --------------------------------------------------------------------------
···
 	 * _OSC method may exist in module level code,
 	 * so it must be run after ACPI_FULL_INITIALIZATION
 	 */
-	acpi_bus_osc_support();
+	acpi_bus_osc_negotiate_platform_control();
+	acpi_bus_osc_negotiate_usb_control();
 
 	/*
 	 * _PDC control method may load dynamic SSDT tables,

drivers/thunderbolt/acpi.c

···
 	if (ACPI_FAILURE(status))
 		dev_warn(&nhi->pdev->dev, "failed to enumerate tunneled ports\n");
 }
+
+/**
+ * tb_acpi_is_native() - Did the platform grant native TBT/USB4 control
+ *
+ * Returns %true if the platform granted OS native control over
+ * TBT/USB4. In this case software based connection manager can be used,
+ * otherwise there is firmware based connection manager running.
+ */
+bool tb_acpi_is_native(void)
+{
+	return osc_sb_native_usb4_support_confirmed &&
+	       osc_sb_native_usb4_control;
+}
+
+/**
+ * tb_acpi_may_tunnel_usb3() - Is USB3 tunneling allowed by the platform
+ *
+ * When software based connection manager is used, this function
+ * returns %true if platform allows native USB3 tunneling.
+ */
+bool tb_acpi_may_tunnel_usb3(void)
+{
+	if (tb_acpi_is_native())
+		return osc_sb_native_usb4_control & OSC_USB_USB3_TUNNELING;
+	return true;
+}
+
+/**
+ * tb_acpi_may_tunnel_dp() - Is DisplayPort tunneling allowed by the platform
+ *
+ * When software based connection manager is used, this function
+ * returns %true if platform allows native DP tunneling.
+ */
+bool tb_acpi_may_tunnel_dp(void)
+{
+	if (tb_acpi_is_native())
+		return osc_sb_native_usb4_control & OSC_USB_DP_TUNNELING;
+	return true;
+}
+
+/**
+ * tb_acpi_may_tunnel_pcie() - Is PCIe tunneling allowed by the platform
+ *
+ * When software based connection manager is used, this function
+ * returns %true if platform allows native PCIe tunneling.
+ */
+bool tb_acpi_may_tunnel_pcie(void)
+{
+	if (tb_acpi_is_native())
+		return osc_sb_native_usb4_control & OSC_USB_PCIE_TUNNELING;
+	return true;
+}
+
+/**
+ * tb_acpi_is_xdomain_allowed() - Are XDomain connections allowed
+ *
+ * When software based connection manager is used, this function
+ * returns %true if platform allows XDomain connections.
+ */
+bool tb_acpi_is_xdomain_allowed(void)
+{
+	if (tb_acpi_is_native())
+		return osc_sb_native_usb4_control & OSC_USB_XDOMAIN;
+	return true;
+}

drivers/thunderbolt/cap.c

···
 
 /**
  * tb_switch_find_cap() - Find switch capability
- * @sw Switch to find the capability for
+ * @sw: Switch to find the capability for
  * @cap: Capability to look
  *
  * Returns offset to start of capability or %-ENOENT if no such

drivers/thunderbolt/ctl.c

···
 #define TB_CTL_RETRIES		4
 
 /**
- * struct tb_cfg - thunderbolt control channel
+ * struct tb_ctl - Thunderbolt control channel
+ * @nhi: Pointer to the NHI structure
+ * @tx: Transmit ring
+ * @rx: Receive ring
+ * @frame_pool: DMA pool for control messages
+ * @rx_packets: Received control messages
+ * @request_queue_lock: Lock protecting @request_queue
+ * @request_queue: List of outstanding requests
+ * @running: Is the control channel running at the moment
+ * @callback: Callback called when hotplug message is received
+ * @callback_data: Data passed to @callback
  */
 struct tb_ctl {
 	struct tb_nhi *nhi;
···
 	tb_ctl_pkg_free(pkg);
 }
 
-/**
+/*
  * tb_cfg_tx() - transmit a packet on the control channel
  *
  * len must be a multiple of four.
···
 	return res;
 }
 
-/**
+/*
  * tb_ctl_handle_event() - acknowledge a plug event, invoke ctl->callback
  */
 static bool tb_ctl_handle_event(struct tb_ctl *ctl, enum tb_cfg_pkg_type type,
···
 
 /**
  * tb_ctl_alloc() - allocate a control channel
+ * @nhi: Pointer to NHI
+ * @cb: Callback called for plug events
+ * @cb_data: Data passed to @cb
  *
  * cb will be invoked once for every hot plug event.
  *
···
 
 /**
  * tb_ctl_free() - free a control channel
+ * @ctl: Control channel to free
  *
  * Must be called after tb_ctl_stop.
  *
···
 
 /**
  * tb_cfg_start() - start/resume the control channel
+ * @ctl: Control channel to start
  */
 void tb_ctl_start(struct tb_ctl *ctl)
 {
···
 }
 
 /**
- * control() - pause the control channel
+ * tb_ctrl_stop() - pause the control channel
+ * @ctl: Control channel to stop
  *
  * All invocations of ctl->callback will have finished after this method
  * returns.
···
 
 /**
  * tb_cfg_reset() - send a reset packet and wait for a response
+ * @ctl: Control channel pointer
+ * @route: Router string for the router to send reset
+ * @timeout_msec: Timeout in ms how long to wait for the response
  *
  * If the switch at route is incorrectly configured then we will not receive a
  * reply (even though the switch will reset). The caller should check for
···
 }
 
 /**
- * tb_cfg_read() - read from config space into buffer
+ * tb_cfg_read_raw() - read from config space into buffer
+ * @ctl: Pointer to the control channel
+ * @buffer: Buffer where the data is read
+ * @route: Route string of the router
+ * @port: Port number when reading from %TB_CFG_PORT, %0 otherwise
+ * @space: Config space selector
+ * @offset: Dword word offset of the register to start reading
+ * @length: Number of dwords to read
+ * @timeout_msec: Timeout in ms how long to wait for the response
  *
- * Offset and length are in dwords.
+ * Reads from router config space without translating the possible error.
  */
 struct tb_cfg_result tb_cfg_read_raw(struct tb_ctl *ctl, void *buffer,
 		u64 route, u32 port, enum tb_cfg_space space,
···
 
 /**
  * tb_cfg_write() - write from buffer into config space
+ * @ctl: Pointer to the control channel
+ * @buffer: Data to write
+ * @route: Route string of the router
+ * @port: Port number when writing to %TB_CFG_PORT, %0 otherwise
+ * @space: Config space selector
+ * @offset: Dword word offset of the register to start writing
+ * @length: Number of dwords to write
+ * @timeout_msec: Timeout in ms how long to wait for the response
  *
- * Offset and length are in dwords.
+ * Writes to router config space without translating the possible error.
  */
 struct tb_cfg_result tb_cfg_write_raw(struct tb_ctl *ctl, const void *buffer,
 		u64 route, u32 port, enum tb_cfg_space space,
···
 
 /**
  * tb_cfg_get_upstream_port() - get upstream port number of switch at route
+ * @ctl: Pointer to the control channel
+ * @route: Route string of the router
  *
  * Reads the first dword from the switches TB_CFG_SWITCH config area and
  * returns the port number from which the reply originated.

drivers/thunderbolt/dma_port.c

···
 	/* Write the block to MAIL_DATA registers */
 	ret = dma_port_write(sw->tb->ctl, buf, tb_route(sw), dma->port,
 			    dma->base + MAIL_DATA, dwords, DMA_PORT_TIMEOUT);
+	if (ret)
+		return ret;
 
 	in = MAIL_IN_CMD_FLASH_WRITE << MAIL_IN_CMD_SHIFT;
 

drivers/thunderbolt/dma_test.c

···
  *	    Mika Westerberg <[e-mail]>
  */
 
-#include <linux/acpi.h>
 #include <linux/completion.h>
 #include <linux/debugfs.h>
 #include <linux/module.h>
···
 		tf->frame.size = 0; /* means 4096 */
 		tf->dma_test = dt;
 
-		tf->data = kzalloc(DMA_TEST_FRAME_SIZE, GFP_KERNEL);
+		tf->data = kmemdup(dma_test_pattern, DMA_TEST_FRAME_SIZE, GFP_KERNEL);
 		if (!tf->data) {
 			kfree(tf);
 			return -ENOMEM;
 		}
-
-		memcpy(tf->data, dma_test_pattern, DMA_TEST_FRAME_SIZE);
 
 		dma_addr = dma_map_single(dma_dev, tf->data, DMA_TEST_FRAME_SIZE,
 					  DMA_TO_DEVICE);

drivers/thunderbolt/domain.c

···
 	[TB_SECURITY_SECURE] = "secure",
 	[TB_SECURITY_DPONLY] = "dponly",
 	[TB_SECURITY_USBONLY] = "usbonly",
+	[TB_SECURITY_NOPCIE] = "nopcie",
 };
 
 static ssize_t boot_acl_show(struct device *dev, struct device_attribute *attr,
···
 }
 static DEVICE_ATTR_RW(boot_acl);
 
+static ssize_t deauthorization_show(struct device *dev,
+				    struct device_attribute *attr,
+				    char *buf)
+{
+	const struct tb *tb = container_of(dev, struct tb, dev);
+	bool deauthorization = false;
+
+	/* Only meaningful if authorization is supported */
+	if (tb->security_level == TB_SECURITY_USER ||
+	    tb->security_level == TB_SECURITY_SECURE)
+		deauthorization = !!tb->cm_ops->disapprove_switch;
+
+	return sprintf(buf, "%d\n", deauthorization);
+}
+static DEVICE_ATTR_RO(deauthorization);
+
 static ssize_t iommu_dma_protection_show(struct device *dev,
 					 struct device_attribute *attr,
 					 char *buf)
···
 
 static struct attribute *domain_attrs[] = {
 	&dev_attr_boot_acl.attr,
+	&dev_attr_deauthorization.attr,
 	&dev_attr_iommu_dma_protection.attr,
 	&dev_attr_security.attr,
 	NULL,
···
 	return attr->mode;
 }
 
-static struct attribute_group domain_attr_group = {
+static const struct attribute_group domain_attr_group = {
 	.is_visible = domain_attr_is_visible,
 	.attrs = domain_attrs,
 };
···
 	switch (type) {
 	case TB_CFG_PKG_XDOMAIN_REQ:
 	case TB_CFG_PKG_XDOMAIN_RESP:
-		return tb_xdomain_handle_request(tb, type, buf, size);
+		if (tb_is_xdomain_enabled())
+			return tb_xdomain_handle_request(tb, type, buf, size);
+		break;
 
 	default:
 		tb->cm_ops->handle_event(tb, type, buf, size);
···
 		if (ret)
 			goto err_ctl_stop;
 	}
+
+	tb_dbg(tb, "security level set to %s\n",
+	       tb_security_names[tb->security_level]);
 
 	ret = device_add(&tb->dev);
 	if (ret)
···
 }
 
 /**
+ * tb_domain_disapprove_switch() - Disapprove switch
+ * @tb: Domain the switch belongs to
+ * @sw: Switch to disapprove
+ *
+ * This will disconnect PCIe tunnel from parent to this @sw.
+ *
+ * Return: %0 on success and negative errno in case of failure.
+ */
+int tb_domain_disapprove_switch(struct tb *tb, struct tb_switch *sw)
+{
+	if (!tb->cm_ops->disapprove_switch)
+		return -EPERM;
+
+	return tb->cm_ops->disapprove_switch(tb, sw);
+}
+
+/**
  * tb_domain_approve_switch() - Approve switch
  * @tb: Domain the switch belongs to
  * @sw: Switch to approve
  *
  * This will approve switch by connection manager specific means. In
- * case of success the connection manager will create tunnels for all
- * supported protocols.
+ * case of success the connection manager will create PCIe tunnel from
+ * parent to @sw.
  */
 int tb_domain_approve_switch(struct tb *tb, struct tb_switch *sw)
 {

drivers/thunderbolt/eeprom.c

···
 #include <linux/slab.h>
 #include "tb.h"
 
-/**
+/*
  * tb_eeprom_ctl_write() - write control word
  */
 static int tb_eeprom_ctl_write(struct tb_switch *sw, struct tb_eeprom_ctl *ctl)
···
 	return tb_sw_write(sw, ctl, TB_CFG_SWITCH, sw->cap_plug_events + 4, 1);
 }
 
-/**
+/*
  * tb_eeprom_ctl_write() - read control word
  */
 static int tb_eeprom_ctl_read(struct tb_switch *sw, struct tb_eeprom_ctl *ctl)
···
 	TB_EEPROM_OUT,
 };
 
-/**
+/*
  * tb_eeprom_active - enable rom access
  *
  * WARNING: Always disable access after usage. Otherwise the controller will
···
 	}
 }
 
-/**
+/*
  * tb_eeprom_transfer - transfer one bit
  *
  * If TB_EEPROM_IN is passed, then the bit can be retrieved from ctl->data_in.
···
 	return tb_eeprom_ctl_write(sw, ctl);
 }
 
-/**
+/*
  * tb_eeprom_out - write one byte to the bus
  */
 static int tb_eeprom_out(struct tb_switch *sw, u8 val)
···
 	return 0;
 }
 
-/**
+/*
  * tb_eeprom_in - read one byte from the bus
  */
 static int tb_eeprom_in(struct tb_switch *sw, u8 *val)
···
 	return 0;
 }
 
-/**
+/*
  * tb_eeprom_get_drom_offset - get drom offset within eeprom
  */
 static int tb_eeprom_get_drom_offset(struct tb_switch *sw, u16 *offset)
···
 	return 0;
 }
 
-/**
+/*
  * tb_eeprom_read_n - read count bytes from offset into val
  */
 static int tb_eeprom_read_n(struct tb_switch *sw, u16 offset, u8 *val,
···
 
 
 /**
- * tb_drom_read_uid_only - read uid directly from drom
+ * tb_drom_read_uid_only() - Read UID directly from DROM
+ * @sw: Router whose UID to read
+ * @uid: UID is placed here
  *
  * Does not use the cached copy in sw->drom. Used during resume to check switch
  * identity.
···
 	return 0;
 }
 
-/**
+/*
  * tb_drom_parse_entries - parse the linked list of drom entries
  *
  * Drom must have been copied to sw->drom.
···
 	return 0;
 }
 
-/**
+/*
  * tb_drom_copy_efi - copy drom supplied by EFI to sw->drom if present
  */
 static int tb_drom_copy_efi(struct tb_switch *sw, u16 *size)
···
 }
 
 /**
- * tb_drom_read - copy drom to sw->drom and parse it
+ * tb_drom_read() - Copy DROM to sw->drom and parse it
+ * @sw: Router whose DROM to read and parse
+ *
+ * This function reads router DROM and if successful parses the entries and
+ * populates the fields in @sw accordingly. Can be called for any router
+ * generation.
+ *
+ * Returns %0 in case of success and negative errno otherwise.
  */
 int tb_drom_read(struct tb_switch *sw)
 {

drivers/thunderbolt/icm.c

···
  * @set_uuid: Set UUID for the root switch (optional)
  * @device_connected: Handle device connected ICM message
  * @device_disconnected: Handle device disconnected ICM message
- * @xdomain_connected - Handle XDomain connected ICM message
- * @xdomain_disconnected - Handle XDomain disconnected ICM message
+ * @xdomain_connected: Handle XDomain connected ICM message
+ * @xdomain_disconnected: Handle XDomain disconnected ICM message
  * @rtd3_veto: Handle RTD3 veto notification ICM message
  */
 struct icm {
···
 			icm->device_disconnected(tb, n->pkg);
 			break;
 		case ICM_EVENT_XDOMAIN_CONNECTED:
-			icm->xdomain_connected(tb, n->pkg);
+			if (tb_is_xdomain_enabled())
+				icm->xdomain_connected(tb, n->pkg);
 			break;
 		case ICM_EVENT_XDOMAIN_DISCONNECTED:
-			icm->xdomain_disconnected(tb, n->pkg);
+			if (tb_is_xdomain_enabled())
+				icm->xdomain_disconnected(tb, n->pkg);
 			break;
 		case ICM_EVENT_RTD3_VETO:
 			icm->rtd3_veto(tb, n->pkg);

drivers/thunderbolt/lc.c

···
 	tb_lc_set_xdomain_configured(port, false);
 }
 
+/**
+ * tb_lc_start_lane_initialization() - Start lane initialization
+ * @port: Device router lane 0 adapter
+ *
+ * Starts lane initialization for @port after the router resumed from
+ * sleep. Should be called for those downstream lane adapters that were
+ * not connected (tb_lc_configure_port() was not called) before sleep.
+ *
+ * Returns %0 in success and negative errno in case of failure.
+ */
+int tb_lc_start_lane_initialization(struct tb_port *port)
+{
+	struct tb_switch *sw = port->sw;
+	int ret, cap;
+	u32 ctrl;
+
+	if (!tb_route(sw))
+		return 0;
+
+	if (sw->generation < 2)
+		return 0;
+
+	cap = find_port_lc_cap(port);
+	if (cap < 0)
+		return cap;
+
+	ret = tb_sw_read(sw, &ctrl, TB_CFG_SWITCH, cap + TB_LC_SX_CTRL, 1);
+	if (ret)
+		return ret;
+
+	ctrl |= TB_LC_SX_CTRL_SLI;
+
+	return tb_sw_write(sw, &ctrl, TB_CFG_SWITCH, cap + TB_LC_SX_CTRL, 1);
+}
+
 static int tb_lc_set_wake_one(struct tb_switch *sw, unsigned int offset,
 			      unsigned int flags)
 {

drivers/thunderbolt/nhi.c

···
 	return bit;
 }
 
-/**
+/*
  * ring_interrupt_active() - activate/deactivate interrupts for a single ring
  *
  * ring->nhi->lock must be held.
···
 	iowrite32(new, ring->nhi->iobase + reg);
 }
 
-/**
+/*
  * nhi_disable_interrupts() - disable interrupts for all rings
  *
  * Use only during init and shutdown.
···
 	return ring->head == ring->tail;
 }
 
-/**
+/*
  * ring_write_descriptors() - post frames from ring->queue to the controller
  *
  * ring->lock is held.
···
 	}
 }
 
-/**
+/*
  * ring_work() - progress completed frames
  *
  * If the ring is shutting down then all frames are marked as canceled and
···
 
 /**
  * tb_ring_start() - enable a ring
+ * @ring: Ring to start
  *
  * Must not be invoked in parallel with tb_ring_stop().
  */
···
 
 /**
  * tb_ring_stop() - shutdown a ring
+ * @ring: Ring to stop
  *
  * Must not be invoked from a callback.
  *
···
 	dev_dbg(&ring->nhi->pdev->dev, "freeing %s %d\n", RING_TYPE(ring),
 		ring->hop);
 
-	/**
+	/*
 	 * ring->work can no longer be scheduled (it is scheduled only
 	 * by nhi_interrupt_work, ring_stop and ring_msix). Wait for it
 	 * to finish before freeing the ring.
···
 	}
 }
 
+static struct tb *nhi_select_cm(struct tb_nhi *nhi)
+{
+	struct tb *tb;
+
+	/*
+	 * USB4 case is simple. If we got control of any of the
+	 * capabilities, we use software CM.
+	 */
+	if (tb_acpi_is_native())
+		return tb_probe(nhi);
+
+	/*
+	 * Either firmware based CM is running (we did not get control
+	 * from the firmware) or this is pre-USB4 PC so try first
+	 * firmware CM and then fallback to software CM.
+	 */
+	tb = icm_probe(nhi);
+	if (!tb)
+		tb = tb_probe(nhi);
+
+	return tb;
+}
+
 static int nhi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	struct tb_nhi *nhi;
···
 	tb_apple_add_links(nhi);
 	tb_acpi_add_links(nhi);
 
-	tb = icm_probe(nhi);
-	if (!tb)
-		tb = tb_probe(nhi);
+	tb = nhi_select_cm(nhi);
 	if (!tb) {
 		dev_err(&nhi->pdev->dev,
 			"failed to determine connection manager, aborting\n");

drivers/thunderbolt/path.c

···
 
 /**
  * tb_path_activate() - activate a path
+ * @path: Path to activate
  *
  * Activate a path starting with the last hop and iterating backwards. The
  * caller must fill path->hops before calling tb_path_activate().
···
 
 /**
  * tb_path_is_invalid() - check whether any ports on the path are invalid
+ * @path: Path to check
  *
  * Return: Returns true if the path is invalid, false otherwise.
  */

drivers/thunderbolt/switch.c

···
 
 /**
  * tb_wait_for_port() - wait for a port to become ready
+ * @port: Port to wait
+ * @wait_if_unplugged: Wait also when port is unplugged
  *
  * Wait up to 1 second for a port to reach state TB_PORT_UP. If
  * wait_if_unplugged is set then we also wait if the port is in state
···
 
 /**
  * tb_port_add_nfc_credits() - add/remove non flow controlled credits to port
+ * @port: Port to add/remove NFC credits
+ * @credits: Credits to add/remove
  *
  * Change the number of NFC credits allocated to @port by @credits. To remove
  * NFC credits pass a negative amount of credits.
···
 
 /**
  * tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER
+ * @port: Port whose counters to clear
+ * @counter: Counter index to clear
  *
  * Return: Returns 0 on success or an error code on failure.
  */
···
 	return __tb_port_enable(port, false);
 }
 
-/**
+/*
  * tb_init_port() - initialize a port
  *
  * This is a helper method for tb_switch_alloc. Does not check or initialize
···
 	tb_port_set_link_width(port, 1);
 }
 
+static int tb_port_start_lane_initialization(struct tb_port *port)
+{
+	int ret;
+
+	if (tb_switch_is_usb4(port->sw))
+		return 0;
+
+	ret = tb_lc_start_lane_initialization(port);
+	return ret == -EINVAL ? 0 : ret;
+}
+
 /**
  * tb_port_is_enabled() - Is the adapter port enabled
  * @port: Port to check
···
 }
 
 /**
- * reset_switch() - reconfigure route, enable and send TB_CFG_PKG_RESET
+ * tb_switch_reset() - reconfigure route, enable and send TB_CFG_PKG_RESET
  * @sw: Switch to reset
  *
  * Return: Returns 0 on success or an error code on failure.
···
 	return res.err;
 }
 
-/**
+/*
  * tb_plug_events_active() - enable/disable plug events on a switch
  *
  * Also configures a sane plug_events_delay of 255ms.
···
 	return sprintf(buf, "%u\n", sw->authorized);
 }
 
+static int disapprove_switch(struct device *dev, void *not_used)
+{
+	struct tb_switch *sw;
+
+	sw = tb_to_switch(dev);
+	if (sw && sw->authorized) {
+		int ret;
+
+		/* First children */
+		ret = device_for_each_child_reverse(&sw->dev, NULL, disapprove_switch);
+		if (ret)
+			return ret;
+
+		ret = tb_domain_disapprove_switch(sw->tb, sw);
+		if (ret)
+			return ret;
+
+		sw->authorized = 0;
+		kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);
+	}
+
+	return 0;
+}
+
 static int tb_switch_set_authorized(struct tb_switch *sw, unsigned int val)
 {
 	int ret = -EINVAL;
···
 	if (!mutex_trylock(&sw->tb->lock))
 		return restart_syscall();
 
-	if (sw->authorized)
+	if (!!sw->authorized == !!val)
 		goto unlock;
 
 	switch (val) {
+	/* Disapprove switch */
+	case 0:
+		if (tb_route(sw)) {
+			ret = disapprove_switch(&sw->dev, NULL);
+			goto unlock;
+		}
+		break;
+
 	/* Approve switch */
 	case 1:
 		if (sw->key)
···
 	struct device *dev = kobj_to_dev(kobj);
 	struct tb_switch *sw = tb_to_switch(dev);
 
-	if (attr == &dev_attr_device.attr) {
+	if (attr == &dev_attr_authorized.attr) {
+		if (sw->tb->security_level == TB_SECURITY_NOPCIE ||
+		    sw->tb->security_level == TB_SECURITY_DPONLY)
+			return 0;
+	} else if (attr == &dev_attr_device.attr) {
 		if (!sw->device)
 			return 0;
 	} else if (attr == &dev_attr_device_name.attr) {
···
 	return sw->safe_mode ? 0 : attr->mode;
 }
 
-static struct attribute_group switch_group = {
+static const struct attribute_group switch_group = {
 	.is_visible = switch_attr_is_visible,
 	.attrs = switch_attrs,
 };
···
 
 /**
  * tb_sw_set_unplugged() - set is_unplugged on switch and downstream switches
+ * @sw: Router to mark unplugged
  */
 void tb_sw_set_unplugged(struct tb_switch *sw)
 {
···
 
 	/* check for surviving downstream switches */
 	tb_switch_for_each_port(sw, port) {
-		if (!tb_port_has_remote(port) && !port->xdomain)
+		if (!tb_port_has_remote(port) && !port->xdomain) {
+			/*
+			 * For disconnected downstream lane adapters
+			 * start lane initialization now so we detect
+			 * future connects.
+			 */
+			if (!tb_is_upstream_port(port) && tb_port_is_null(port))
+				tb_port_start_lane_initialization(port);
 			continue;
+		} else if (port->xdomain) {
+			/*
+			 * Start lane initialization for XDomain so the
+			 * link gets re-established.
+			 */
+			tb_port_start_lane_initialization(port);
+		}
 
 		if (tb_wait_for_port(port, true) <= 0) {
 			tb_port_warn(port,

drivers/thunderbolt/tb.c

···
 	struct tb_xdomain *xd;
 	u64 route;
 
+	if (!tb_is_xdomain_enabled())
+		return;
+
 	route = tb_downstream_route(port);
 	xd = tb_xdomain_find_by_route(tb, route);
 	if (xd) {
···
 	struct tb_cm *tcm = tb_priv(tb);
 	struct tb_tunnel *tunnel;
 
+	if (!tb_acpi_may_tunnel_usb3()) {
+		tb_dbg(tb, "USB3 tunneling disabled, not creating tunnel\n");
+		return 0;
+	}
+
 	up = tb_switch_find_port(sw, TB_TYPE_USB3_UP);
 	if (!up)
 		return 0;
···
 	struct tb_port *port;
 	int ret;
 
+	if (!tb_acpi_may_tunnel_usb3())
+		return 0;
+
 	if (tb_route(sw)) {
 		ret = tb_tunnel_usb3(sw->tb, sw);
 		if (ret)
···
 
 static void tb_scan_port(struct tb_port *port);
 
-/**
+/*
  * tb_scan_switch() - scan for and initialize downstream switches
  */
 static void tb_scan_switch(struct tb_switch *sw)
···
 	pm_runtime_put_autosuspend(&sw->dev);
 }
 
-/**
+/*
  * tb_scan_port() - check for and initialize switches below port
  */
 static void tb_scan_port(struct tb_port *port)
···
 	tb_tunnel_free(tunnel);
 }
 
-/**
+/*
  * tb_free_invalid_tunnels() - destroy tunnels of devices that have gone away
  */
 static void tb_free_invalid_tunnels(struct tb *tb)
···
 	}
 }
 
-/**
+/*
  * tb_free_unplugged_children() - traverse hierarchy and free unplugged switches
  */
 static void tb_free_unplugged_children(struct tb_switch *sw)
···
 	struct tb_cm *tcm = tb_priv(tb);
 	struct tb_port *port, *in, *out;
 	struct tb_tunnel *tunnel;
+
+	if (!tb_acpi_may_tunnel_dp()) {
+		tb_dbg(tb, "DP tunneling disabled, not creating tunnel\n");
+		return;
+	}
 
 	/*
 	 * Find pair of inactive DP IN and DP OUT adapters and then
···
 	}
 }
 
+static int tb_disconnect_pci(struct tb *tb, struct tb_switch *sw)
+{
+	struct tb_tunnel *tunnel;
+	struct tb_port *up;
+
+	up = tb_switch_find_port(sw, TB_TYPE_PCIE_UP);
+	if (WARN_ON(!up))
+		return -ENODEV;
+
+	tunnel = tb_find_tunnel(tb, TB_TUNNEL_PCI, NULL, up);
+	if (WARN_ON(!tunnel))
+		return -ENODEV;
+
+	tb_tunnel_deactivate(tunnel);
+	list_del(&tunnel->list);
+	tb_tunnel_free(tunnel);
+	return 0;
+}
+
 static int tb_tunnel_pci(struct tb *tb, struct tb_switch *sw)
 {
 	struct tb_port *up, *down, *port;
···
 
 /* hotplug handling */
 
-/**
+/*
  * tb_handle_hotplug() - handle hotplug event
  *
  * Executes on tb->wq.
···
 	kfree(ev);
 }
 
-/**
+/*
  * tb_schedule_hotplug_handler() - callback function for the control channel
  *
  * Delegates to tb_handle_hotplug.
···
 	.runtime_suspend = tb_runtime_suspend,
 	.runtime_resume = tb_runtime_resume,
 	.handle_event = tb_handle_event,
+	.disapprove_switch = tb_disconnect_pci,
 	.approve_switch = tb_tunnel_pci,
 	.approve_xdomain_paths = tb_approve_xdomain_paths,
 	.disconnect_xdomain_paths = tb_disconnect_xdomain_paths,
···
 	if (!tb)
 		return NULL;
 
-	tb->security_level = TB_SECURITY_USER;
+	if (tb_acpi_may_tunnel_pcie())
+		tb->security_level = TB_SECURITY_USER;
+	else
+		tb->security_level = TB_SECURITY_NOPCIE;
+
 	tb->cm_ops = &tb_cm_ops;
 
 	tcm = tb_priv(tb);

drivers/thunderbolt/tb.h

···
  *
  * When the switch is being added or removed to the domain (other
  * switches) you need to have domain lock held.
+ *
+ * In USB4 terminology this structure represents a router.
  */
 struct tb_switch {
 	struct device dev;
···
  * @in_hopids: Currently allocated input HopIDs
  * @out_hopids: Currently allocated output HopIDs
  * @list: Used to link ports to DP resources list
+ *
+ * In USB4 terminology this structure represents an adapter (protocol or
+ * lane adapter).
  */
 struct tb_port {
 	struct tb_regs_port_header config;
···
  * @handle_event: Handle thunderbolt event
  * @get_boot_acl: Get boot ACL list
  * @set_boot_acl: Set boot ACL list
+ * @disapprove_switch: Disapprove switch (disconnect PCIe tunnel)
  * @approve_switch: Approve switch
  * @add_switch_key: Add key to switch
  * @challenge_switch_key: Challenge switch using key
···
 			     const void *buf, size_t size);
 	int (*get_boot_acl)(struct tb *tb, uuid_t *uuids, size_t nuuids);
 	int (*set_boot_acl)(struct tb *tb, const uuid_t *uuids, size_t nuuids);
+	int (*disapprove_switch)(struct tb *tb, struct tb_switch *sw);
 	int (*approve_switch)(struct tb *tb, struct tb_switch *sw);
 	int (*add_switch_key)(struct tb *tb, struct tb_switch *sw);
 	int (*challenge_switch_key)(struct tb *tb, struct tb_switch *sw,
···
 void tb_domain_complete(struct tb *tb);
 int tb_domain_runtime_suspend(struct tb *tb);
 int tb_domain_runtime_resume(struct tb *tb);
+int tb_domain_disapprove_switch(struct tb *tb, struct tb_switch *sw);
 int tb_domain_approve_switch(struct tb *tb, struct tb_switch *sw);
 int tb_domain_approve_switch_key(struct tb *tb, struct tb_switch *sw);
 int tb_domain_challenge_switch_key(struct tb *tb, struct tb_switch *sw);
···
 void tb_lc_unconfigure_port(struct tb_port *port);
 int tb_lc_configure_xdomain(struct tb_port *port);
 void tb_lc_unconfigure_xdomain(struct tb_port *port);
+int tb_lc_start_lane_initialization(struct tb_port *port);
 int tb_lc_set_wake(struct tb_switch *sw, unsigned int flags);
 int tb_lc_set_sleep(struct tb_switch *sw);
 bool tb_lc_lane_bonding_possible(struct tb_switch *sw);
···
 	       | ((u64) port->port << (port->sw->config.depth * 8));
 }
 
+bool tb_is_xdomain_enabled(void);
 bool tb_xdomain_handle_request(struct tb *tb, enum tb_cfg_pkg_type type,
 			       const void *buf, size_t size);
 struct tb_xdomain *tb_xdomain_alloc(struct tb *tb, struct device *parent,
···
 
 #ifdef CONFIG_ACPI
 void tb_acpi_add_links(struct tb_nhi *nhi);
+
+bool tb_acpi_is_native(void);
+bool tb_acpi_may_tunnel_usb3(void);
+bool tb_acpi_may_tunnel_dp(void);
+bool tb_acpi_may_tunnel_pcie(void);
+bool tb_acpi_is_xdomain_allowed(void);
 #else
 static inline void tb_acpi_add_links(struct tb_nhi *nhi) { }
+
+static inline bool tb_acpi_is_native(void) { return true; }
+static inline bool tb_acpi_may_tunnel_usb3(void) { return true; }
+static inline bool tb_acpi_may_tunnel_dp(void) { return true; }
+static inline bool tb_acpi_may_tunnel_pcie(void) { return true; }
+static inline bool tb_acpi_is_xdomain_allowed(void) { return true; }
 #endif
 
 #ifdef CONFIG_DEBUG_FS

drivers/thunderbolt/tb_regs.h

···
 #define TB_LC_SX_CTRL_L1D		BIT(17)
 #define TB_LC_SX_CTRL_L2C		BIT(20)
 #define TB_LC_SX_CTRL_L2D		BIT(21)
+#define TB_LC_SX_CTRL_SLI		BIT(29)
 #define TB_LC_SX_CTRL_UPSTREAM		BIT(30)
 #define TB_LC_SX_CTRL_SLP		BIT(31)
 

drivers/thunderbolt/tunnel.c

···
  * @transmit_path: HopID used for transmitting packets
  * @receive_ring: NHI ring number used to receive packets from the
  *		  other domain. Set to %0 if RX path is not needed.
- * @reveive_path: HopID used for receiving packets
+ * @receive_path: HopID used for receiving packets
  *
  * Return: Returns a tb_tunnel on success or NULL on failure.
  */
···
 static int tb_usb3_consumed_bandwidth(struct tb_tunnel *tunnel,
 		int *consumed_up, int *consumed_down)
 {
+	int pcie_enabled = tb_acpi_may_tunnel_pcie();
+
 	/*
-	 * PCIe tunneling affects the USB3 bandwidth so take that it
-	 * into account here.
+	 * PCIe tunneling, if enabled, affects the USB3 bandwidth so
+	 * take that it into account here.
 	 */
-	*consumed_up = tunnel->allocated_up * (3 + 1) / 3;
-	*consumed_down = tunnel->allocated_down * (3 + 1) / 3;
+	*consumed_up = tunnel->allocated_up * (3 + pcie_enabled) / 3;
+	*consumed_down = tunnel->allocated_down * (3 + pcie_enabled) / 3;
 	return 0;
 }
 

drivers/thunderbolt/usb4.c

···
 	if (ret)
 		return ret;
 
-	if (sw->link_usb4 && tb_switch_find_port(parent, TB_TYPE_USB3_DOWN)) {
+	if (tb_acpi_may_tunnel_usb3() && sw->link_usb4 &&
+	    tb_switch_find_port(parent, TB_TYPE_USB3_DOWN)) {
 		val |= ROUTER_CS_5_UTO;
 		xhci = false;
 	}
 
-	/* Only enable PCIe tunneling if the parent router supports it */
-	if (tb_switch_find_port(parent, TB_TYPE_PCIE_DOWN)) {
+	/*
+	 * Only enable PCIe tunneling if the parent router supports it
+	 * and it is not disabled.
+	 */
+	if (tb_acpi_may_tunnel_pcie() &&
+	    tb_switch_find_port(parent, TB_TYPE_PCIE_DOWN)) {
 		val |= ROUTER_CS_5_PTO;
 		/*
 		 * xHCI can be enabled if PCIe tunneling is supported

drivers/thunderbolt/xdomain.c

···
 	struct tb *tb;
 };
 
+static bool tb_xdomain_enabled = true;
+module_param_named(xdomain, tb_xdomain_enabled, bool, 0444);
+MODULE_PARM_DESC(xdomain, "allow XDomain protocol (default: true)");
+
 /* Serializes access to the properties and protocol handlers below */
 static DEFINE_MUTEX(xdomain_lock);
 
···
 static const uuid_t tb_xdp_uuid =
 	UUID_INIT(0xb638d70e, 0x42ff, 0x40bb,
 		  0x97, 0xc2, 0x90, 0xe2, 0xc0, 0xb2, 0xff, 0x07);
+
+bool tb_is_xdomain_enabled(void)
+{
+	return tb_xdomain_enabled && tb_acpi_is_xdomain_allowed();
+}
 
 static bool tb_xdomain_match(const struct tb_cfg_request *req,
 			     const struct ctl_pkg *pkg)
···
 
 /**
  * tb_unregister_service_driver() - Unregister XDomain service driver
- * @xdrv: Driver to unregister
+ * @drv: Driver to unregister
  *
  * Unregisters XDomain service driver from the bus.
  */
···
 	NULL,
 };
 
-static struct attribute_group tb_service_attr_group = {
+static const struct attribute_group tb_service_attr_group = {
 	.attrs = tb_service_attrs,
 };
 
···
 	NULL,
 };
 
-static struct attribute_group xdomain_attr_group = {
+static const struct attribute_group xdomain_attr_group = {
 	.attrs = xdomain_attrs,
 };
 

include/linux/acpi.h

···
 #define OSC_SB_OSLPI_SUPPORT			0x00000100
 #define OSC_SB_CPC_DIVERSE_HIGH_SUPPORT		0x00001000
 #define OSC_SB_GENERIC_INITIATOR_SUPPORT	0x00002000
+#define OSC_SB_NATIVE_USB4_SUPPORT		0x00040000
 
 extern bool osc_sb_apei_support_acked;
 extern bool osc_pc_lpi_support_confirmed;
+extern bool osc_sb_native_usb4_support_confirmed;
+
+/* USB4 Capabilities */
+#define OSC_USB_USB3_TUNNELING			0x00000001
+#define OSC_USB_DP_TUNNELING			0x00000002
+#define OSC_USB_PCIE_TUNNELING			0x00000004
+#define OSC_USB_XDOMAIN				0x00000008
+
+extern u32 osc_sb_native_usb4_control;
 
 /* PCI Host Bridge _OSC: Capabilities DWORD 2: Support Field */
 #define OSC_PCI_EXT_CONFIG_SUPPORT		0x00000001

include/linux/thunderbolt.h

···
  * @TB_SECURITY_USBONLY: Only tunnel USB controller of the connected
  *			 Thunderbolt dock (and Display Port). All PCIe
  *			 links downstream of the dock are removed.
+ * @TB_SECURITY_NOPCIE: For USB4 systems this level is used when the
+ *			PCIe tunneling is disabled from the BIOS.
  */
 enum tb_security_level {
 	TB_SECURITY_NONE,
···
 	TB_SECURITY_SECURE,
 	TB_SECURITY_DPONLY,
 	TB_SECURITY_USBONLY,
+	TB_SECURITY_NOPCIE,
 };
 
 /**