linux/drivers/thunderbolt/acpi.c
Greg Kroah-Hartman 0a25669ba8 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.
 -----BEGIN PGP SIGNATURE-----
 
 iQJUBAABCgA+FiEEVTdhRGBbNzLrSUBaAP2fSd+ZWKAFAmAib9IgHG1pa2Eud2Vz
 dGVyYmVyZ0BsaW51eC5pbnRlbC5jb20ACgkQAP2fSd+ZWKAykw/+JfXClHYVlqRh
 IH7kFkD4nA7g7359PpmSLxRBzvkivz7w66BqNtp6GhIF1oGRtDJ5t5ufgwdYX3Ld
 tqH2Glhw9gV5EmeqDzq3TbLzAU+zm9a5bVE3vwQbxpgPGtDigKpDjqUobGFooDaB
 F8EX3H3rwI3i+1/S1vBAZbuJqND0cuDM2yQNYJ//Dch2wnZ/Vy6darzY+GpJYSWi
 ZlzWsvhfbo1V3n1PphzRkvzcMbVcJriVfwJihtY1h3H6RnnD4pqQJ7e1ec+4Pgdv
 fql3lJg0M02rzTSYLyLwuMOojZA+gPqLWb3Fj5pkfjcKoneq1BNTsl4xRzDpqwP3
 /DeOPE+TO6SAsAkRksyH5W9nvaYGmLy0r9JREkkzdhH41RML4ueEjstaJyfWn1N+
 bX2Ba+5A9pIWKYbwfbNTZPyHk9r94IdDDXzjXFLSeOTcCwMf97XX4sgrbPHedxh6
 VAjIrYxuSCTRRN1G6xtPI9aer5wh7e01W71WK3SJhvpqs092E0m0p4gN/nm6yW1Z
 SSJg36uqp0egjU/NxsyNvB1ePQFiUkO7WIow9pVBU+US7vSuW9IXbC59lAx0XUE5
 tonIF7zAiz1hLp6DZRYfTX7R9xbyshep0uhESceCcIsF5winsgUXL76QEMN0fEjf
 wmUG/HWrOd2O/IH8704rfnu7ajxATGM=
 =pzr4
 -----END PGP SIGNATURE-----

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
  ...
2021-02-09 13:00:07 +01:00

183 lines
4.7 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* ACPI support
*
* Copyright (C) 2020, Intel Corporation
* Author: Mika Westerberg <mika.westerberg@linux.intel.com>
*/
#include <linux/acpi.h>
#include "tb.h"
static acpi_status tb_acpi_add_link(acpi_handle handle, u32 level, void *data,
void **return_value)
{
struct fwnode_reference_args args;
struct fwnode_handle *fwnode;
struct tb_nhi *nhi = data;
struct acpi_device *adev;
struct pci_dev *pdev;
struct device *dev;
int ret;
if (acpi_bus_get_device(handle, &adev))
return AE_OK;
fwnode = acpi_fwnode_handle(adev);
ret = fwnode_property_get_reference_args(fwnode, "usb4-host-interface",
NULL, 0, 0, &args);
if (ret)
return AE_OK;
/* It needs to reference this NHI */
if (nhi->pdev->dev.fwnode != args.fwnode)
goto out_put;
/*
* Try to find physical device walking upwards to the hierarcy.
* We need to do this because the xHCI driver might not yet be
* bound so the USB3 SuperSpeed ports are not yet created.
*/
dev = acpi_get_first_physical_node(adev);
while (!dev) {
adev = adev->parent;
if (!adev)
break;
dev = acpi_get_first_physical_node(adev);
}
if (!dev)
goto out_put;
/*
* Check that the device is PCIe. This is because USB3
* SuperSpeed ports have this property and they are not power
* managed with the xHCI and the SuperSpeed hub so we create the
* link from xHCI instead.
*/
while (dev && !dev_is_pci(dev))
dev = dev->parent;
if (!dev)
goto out_put;
/*
* Check that this actually matches the type of device we
* expect. It should either be xHCI or PCIe root/downstream
* port.
*/
pdev = to_pci_dev(dev);
if (pdev->class == PCI_CLASS_SERIAL_USB_XHCI ||
(pci_is_pcie(pdev) &&
(pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT ||
pci_pcie_type(pdev) == PCI_EXP_TYPE_DOWNSTREAM))) {
const struct device_link *link;
link = device_link_add(&pdev->dev, &nhi->pdev->dev,
DL_FLAG_AUTOREMOVE_SUPPLIER |
DL_FLAG_PM_RUNTIME);
if (link) {
dev_dbg(&nhi->pdev->dev, "created link from %s\n",
dev_name(&pdev->dev));
} else {
dev_warn(&nhi->pdev->dev, "device link creation from %s failed\n",
dev_name(&pdev->dev));
}
}
out_put:
fwnode_handle_put(args.fwnode);
return AE_OK;
}
/**
* tb_acpi_add_links() - Add device links based on ACPI description
* @nhi: Pointer to NHI
*
* Goes over ACPI namespace finding tunneled ports that reference to
* @nhi ACPI node. For each reference a device link is added. The link
* is automatically removed by the driver core.
*/
void tb_acpi_add_links(struct tb_nhi *nhi)
{
acpi_status status;
if (!has_acpi_companion(&nhi->pdev->dev))
return;
/*
* Find all devices that have usb4-host-controller interface
* property that references to this NHI.
*/
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 32,
tb_acpi_add_link, NULL, nhi, NULL);
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;
}