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![Rafael J. Wysocki](/assets/img/avatar_default.png)
Replace acpi_bus_get_device() that is going to be dropped with acpi_fetch_acpi_dev(). No intentional functional impact. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
401 lines
10 KiB
C
401 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* ACPI support
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*
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* Copyright (C) 2020, Intel Corporation
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* Author: Mika Westerberg <mika.westerberg@linux.intel.com>
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*/
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#include <linux/acpi.h>
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#include <linux/pm_runtime.h>
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#include "tb.h"
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static acpi_status tb_acpi_add_link(acpi_handle handle, u32 level, void *data,
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void **return_value)
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{
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struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
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struct fwnode_reference_args args;
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struct fwnode_handle *fwnode;
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struct tb_nhi *nhi = data;
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struct pci_dev *pdev;
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struct device *dev;
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int ret;
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if (!adev)
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return AE_OK;
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fwnode = acpi_fwnode_handle(adev);
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ret = fwnode_property_get_reference_args(fwnode, "usb4-host-interface",
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NULL, 0, 0, &args);
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if (ret)
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return AE_OK;
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/* It needs to reference this NHI */
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if (dev_fwnode(&nhi->pdev->dev) != args.fwnode)
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goto out_put;
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/*
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* Try to find physical device walking upwards to the hierarcy.
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* We need to do this because the xHCI driver might not yet be
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* bound so the USB3 SuperSpeed ports are not yet created.
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*/
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dev = acpi_get_first_physical_node(adev);
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while (!dev) {
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adev = adev->parent;
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if (!adev)
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break;
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dev = acpi_get_first_physical_node(adev);
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}
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if (!dev)
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goto out_put;
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/*
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* Check that the device is PCIe. This is because USB3
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* SuperSpeed ports have this property and they are not power
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* managed with the xHCI and the SuperSpeed hub so we create the
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* link from xHCI instead.
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*/
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while (dev && !dev_is_pci(dev))
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dev = dev->parent;
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if (!dev)
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goto out_put;
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/*
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* Check that this actually matches the type of device we
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* expect. It should either be xHCI or PCIe root/downstream
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* port.
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*/
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pdev = to_pci_dev(dev);
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if (pdev->class == PCI_CLASS_SERIAL_USB_XHCI ||
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(pci_is_pcie(pdev) &&
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(pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT ||
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pci_pcie_type(pdev) == PCI_EXP_TYPE_DOWNSTREAM))) {
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const struct device_link *link;
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/*
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* Make them both active first to make sure the NHI does
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* not runtime suspend before the consumer. The
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* pm_runtime_put() below then allows the consumer to
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* runtime suspend again (which then allows NHI runtime
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* suspend too now that the device link is established).
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*/
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pm_runtime_get_sync(&pdev->dev);
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link = device_link_add(&pdev->dev, &nhi->pdev->dev,
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DL_FLAG_AUTOREMOVE_SUPPLIER |
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DL_FLAG_RPM_ACTIVE |
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DL_FLAG_PM_RUNTIME);
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if (link) {
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dev_dbg(&nhi->pdev->dev, "created link from %s\n",
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dev_name(&pdev->dev));
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} else {
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dev_warn(&nhi->pdev->dev, "device link creation from %s failed\n",
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dev_name(&pdev->dev));
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}
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pm_runtime_put(&pdev->dev);
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}
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out_put:
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fwnode_handle_put(args.fwnode);
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return AE_OK;
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}
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/**
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* tb_acpi_add_links() - Add device links based on ACPI description
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* @nhi: Pointer to NHI
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*
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* Goes over ACPI namespace finding tunneled ports that reference to
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* @nhi ACPI node. For each reference a device link is added. The link
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* is automatically removed by the driver core.
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*/
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void tb_acpi_add_links(struct tb_nhi *nhi)
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{
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acpi_status status;
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if (!has_acpi_companion(&nhi->pdev->dev))
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return;
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/*
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* Find all devices that have usb4-host-controller interface
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* property that references to this NHI.
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*/
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status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 32,
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tb_acpi_add_link, NULL, nhi, NULL);
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if (ACPI_FAILURE(status))
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dev_warn(&nhi->pdev->dev, "failed to enumerate tunneled ports\n");
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}
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/**
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* tb_acpi_is_native() - Did the platform grant native TBT/USB4 control
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*
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* Returns %true if the platform granted OS native control over
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* TBT/USB4. In this case software based connection manager can be used,
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* otherwise there is firmware based connection manager running.
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*/
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bool tb_acpi_is_native(void)
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{
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return osc_sb_native_usb4_support_confirmed &&
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osc_sb_native_usb4_control;
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}
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/**
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* tb_acpi_may_tunnel_usb3() - Is USB3 tunneling allowed by the platform
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*
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* When software based connection manager is used, this function
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* returns %true if platform allows native USB3 tunneling.
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*/
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bool tb_acpi_may_tunnel_usb3(void)
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{
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if (tb_acpi_is_native())
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return osc_sb_native_usb4_control & OSC_USB_USB3_TUNNELING;
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return true;
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}
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/**
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* tb_acpi_may_tunnel_dp() - Is DisplayPort tunneling allowed by the platform
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*
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* When software based connection manager is used, this function
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* returns %true if platform allows native DP tunneling.
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*/
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bool tb_acpi_may_tunnel_dp(void)
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{
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if (tb_acpi_is_native())
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return osc_sb_native_usb4_control & OSC_USB_DP_TUNNELING;
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return true;
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}
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/**
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* tb_acpi_may_tunnel_pcie() - Is PCIe tunneling allowed by the platform
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*
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* When software based connection manager is used, this function
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* returns %true if platform allows native PCIe tunneling.
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*/
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bool tb_acpi_may_tunnel_pcie(void)
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{
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if (tb_acpi_is_native())
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return osc_sb_native_usb4_control & OSC_USB_PCIE_TUNNELING;
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return true;
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}
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/**
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* tb_acpi_is_xdomain_allowed() - Are XDomain connections allowed
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*
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* When software based connection manager is used, this function
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* returns %true if platform allows XDomain connections.
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*/
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bool tb_acpi_is_xdomain_allowed(void)
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{
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if (tb_acpi_is_native())
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return osc_sb_native_usb4_control & OSC_USB_XDOMAIN;
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return true;
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}
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/* UUID for retimer _DSM: e0053122-795b-4122-8a5e-57be1d26acb3 */
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static const guid_t retimer_dsm_guid =
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GUID_INIT(0xe0053122, 0x795b, 0x4122,
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0x8a, 0x5e, 0x57, 0xbe, 0x1d, 0x26, 0xac, 0xb3);
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#define RETIMER_DSM_QUERY_ONLINE_STATE 1
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#define RETIMER_DSM_SET_ONLINE_STATE 2
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static int tb_acpi_retimer_set_power(struct tb_port *port, bool power)
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{
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struct usb4_port *usb4 = port->usb4;
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union acpi_object argv4[2];
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struct acpi_device *adev;
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union acpi_object *obj;
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int ret;
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if (!usb4->can_offline)
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return 0;
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adev = ACPI_COMPANION(&usb4->dev);
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if (WARN_ON(!adev))
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return 0;
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/* Check if we are already powered on (and in correct mode) */
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obj = acpi_evaluate_dsm_typed(adev->handle, &retimer_dsm_guid, 1,
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RETIMER_DSM_QUERY_ONLINE_STATE, NULL,
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ACPI_TYPE_INTEGER);
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if (!obj) {
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tb_port_warn(port, "ACPI: query online _DSM failed\n");
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return -EIO;
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}
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ret = obj->integer.value;
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ACPI_FREE(obj);
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if (power == ret)
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return 0;
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tb_port_dbg(port, "ACPI: calling _DSM to power %s retimers\n",
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power ? "on" : "off");
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argv4[0].type = ACPI_TYPE_PACKAGE;
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argv4[0].package.count = 1;
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argv4[0].package.elements = &argv4[1];
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argv4[1].integer.type = ACPI_TYPE_INTEGER;
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argv4[1].integer.value = power;
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obj = acpi_evaluate_dsm_typed(adev->handle, &retimer_dsm_guid, 1,
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RETIMER_DSM_SET_ONLINE_STATE, argv4,
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ACPI_TYPE_INTEGER);
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if (!obj) {
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tb_port_warn(port,
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"ACPI: set online state _DSM evaluation failed\n");
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return -EIO;
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}
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ret = obj->integer.value;
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ACPI_FREE(obj);
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if (ret >= 0) {
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if (power)
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return ret == 1 ? 0 : -EBUSY;
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return 0;
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}
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tb_port_warn(port, "ACPI: set online state _DSM failed with error %d\n", ret);
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return -EIO;
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}
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/**
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* tb_acpi_power_on_retimers() - Call platform to power on retimers
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* @port: USB4 port
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*
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* Calls platform to turn on power to all retimers behind this USB4
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* port. After this function returns successfully the caller can
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* continue with the normal retimer flows (as specified in the USB4
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* spec). Note if this returns %-EBUSY it means the type-C port is in
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* non-USB4/TBT mode (there is non-USB4/TBT device connected).
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*
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* This should only be called if the USB4/TBT link is not up.
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*
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* Returns %0 on success.
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*/
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int tb_acpi_power_on_retimers(struct tb_port *port)
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{
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return tb_acpi_retimer_set_power(port, true);
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}
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/**
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* tb_acpi_power_off_retimers() - Call platform to power off retimers
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* @port: USB4 port
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*
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* This is the opposite of tb_acpi_power_on_retimers(). After returning
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* successfully the normal operations with the @port can continue.
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*
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* Returns %0 on success.
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*/
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int tb_acpi_power_off_retimers(struct tb_port *port)
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{
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return tb_acpi_retimer_set_power(port, false);
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}
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static bool tb_acpi_bus_match(struct device *dev)
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{
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return tb_is_switch(dev) || tb_is_usb4_port_device(dev);
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}
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static struct acpi_device *tb_acpi_find_port(struct acpi_device *adev,
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const struct tb_port *port)
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{
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struct acpi_device *port_adev;
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if (!adev)
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return NULL;
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/*
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* Device routers exists under the downstream facing USB4 port
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* of the parent router. Their _ADR is always 0.
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*/
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list_for_each_entry(port_adev, &adev->children, node) {
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if (acpi_device_adr(port_adev) == port->port)
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return port_adev;
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}
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return NULL;
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}
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static struct acpi_device *tb_acpi_switch_find_companion(struct tb_switch *sw)
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{
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struct acpi_device *adev = NULL;
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struct tb_switch *parent_sw;
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parent_sw = tb_switch_parent(sw);
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if (parent_sw) {
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struct tb_port *port = tb_port_at(tb_route(sw), parent_sw);
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struct acpi_device *port_adev;
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port_adev = tb_acpi_find_port(ACPI_COMPANION(&parent_sw->dev), port);
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if (port_adev)
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adev = acpi_find_child_device(port_adev, 0, false);
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} else {
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struct tb_nhi *nhi = sw->tb->nhi;
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struct acpi_device *parent_adev;
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parent_adev = ACPI_COMPANION(&nhi->pdev->dev);
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if (parent_adev)
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adev = acpi_find_child_device(parent_adev, 0, false);
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}
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return adev;
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}
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static struct acpi_device *tb_acpi_find_companion(struct device *dev)
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{
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/*
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* The Thunderbolt/USB4 hierarchy looks like following:
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*
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* Device (NHI)
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* Device (HR) // Host router _ADR == 0
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* Device (DFP0) // Downstream port _ADR == lane 0 adapter
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* Device (DR) // Device router _ADR == 0
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* Device (UFP) // Upstream port _ADR == lane 0 adapter
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* Device (DFP1) // Downstream port _ADR == lane 0 adapter number
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*
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* At the moment we bind the host router to the corresponding
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* Linux device.
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*/
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if (tb_is_switch(dev))
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return tb_acpi_switch_find_companion(tb_to_switch(dev));
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else if (tb_is_usb4_port_device(dev))
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return tb_acpi_find_port(ACPI_COMPANION(dev->parent),
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tb_to_usb4_port_device(dev)->port);
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return NULL;
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}
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static void tb_acpi_setup(struct device *dev)
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{
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struct acpi_device *adev = ACPI_COMPANION(dev);
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struct usb4_port *usb4 = tb_to_usb4_port_device(dev);
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if (!adev || !usb4)
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return;
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if (acpi_check_dsm(adev->handle, &retimer_dsm_guid, 1,
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BIT(RETIMER_DSM_QUERY_ONLINE_STATE) |
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BIT(RETIMER_DSM_SET_ONLINE_STATE)))
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usb4->can_offline = true;
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}
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static struct acpi_bus_type tb_acpi_bus = {
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.name = "thunderbolt",
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.match = tb_acpi_bus_match,
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.find_companion = tb_acpi_find_companion,
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.setup = tb_acpi_setup,
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};
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int tb_acpi_init(void)
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{
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return register_acpi_bus_type(&tb_acpi_bus);
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}
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void tb_acpi_exit(void)
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{
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unregister_acpi_bus_type(&tb_acpi_bus);
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}
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