| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $) |
| * |
| * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> |
| * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/types.h> |
| #include <linux/mutex.h> |
| #include <linux/pm.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/pci.h> |
| #include <linux/pci-acpi.h> |
| #include <linux/pci-aspm.h> |
| #include <linux/dmar.h> |
| #include <linux/acpi.h> |
| #include <linux/slab.h> |
| #include <linux/dmi.h> |
| #include <linux/platform_data/x86/apple.h> |
| #include <acpi/apei.h> /* for acpi_hest_init() */ |
| |
| #include "internal.h" |
| |
| #define _COMPONENT ACPI_PCI_COMPONENT |
| ACPI_MODULE_NAME("pci_root"); |
| #define ACPI_PCI_ROOT_CLASS "pci_bridge" |
| #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge" |
| static int acpi_pci_root_add(struct acpi_device *device, |
| const struct acpi_device_id *not_used); |
| static void acpi_pci_root_remove(struct acpi_device *device); |
| |
| static int acpi_pci_root_scan_dependent(struct acpi_device *adev) |
| { |
| acpiphp_check_host_bridge(adev); |
| return 0; |
| } |
| |
| #define ACPI_PCIE_REQ_SUPPORT (OSC_PCI_EXT_CONFIG_SUPPORT \ |
| | OSC_PCI_ASPM_SUPPORT \ |
| | OSC_PCI_CLOCK_PM_SUPPORT \ |
| | OSC_PCI_MSI_SUPPORT) |
| |
| static const struct acpi_device_id root_device_ids[] = { |
| {"PNP0A03", 0}, |
| {"", 0}, |
| }; |
| |
| static struct acpi_scan_handler pci_root_handler = { |
| .ids = root_device_ids, |
| .attach = acpi_pci_root_add, |
| .detach = acpi_pci_root_remove, |
| .hotplug = { |
| .enabled = true, |
| .scan_dependent = acpi_pci_root_scan_dependent, |
| }, |
| }; |
| |
| static DEFINE_MUTEX(osc_lock); |
| |
| /** |
| * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge |
| * @handle - the ACPI CA node in question. |
| * |
| * Note: we could make this API take a struct acpi_device * instead, but |
| * for now, it's more convenient to operate on an acpi_handle. |
| */ |
| int acpi_is_root_bridge(acpi_handle handle) |
| { |
| int ret; |
| struct acpi_device *device; |
| |
| ret = acpi_bus_get_device(handle, &device); |
| if (ret) |
| return 0; |
| |
| ret = acpi_match_device_ids(device, root_device_ids); |
| if (ret) |
| return 0; |
| else |
| return 1; |
| } |
| EXPORT_SYMBOL_GPL(acpi_is_root_bridge); |
| |
| static acpi_status |
| get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) |
| { |
| struct resource *res = data; |
| struct acpi_resource_address64 address; |
| acpi_status status; |
| |
| status = acpi_resource_to_address64(resource, &address); |
| if (ACPI_FAILURE(status)) |
| return AE_OK; |
| |
| if ((address.address.address_length > 0) && |
| (address.resource_type == ACPI_BUS_NUMBER_RANGE)) { |
| res->start = address.address.minimum; |
| res->end = address.address.minimum + address.address.address_length - 1; |
| } |
| |
| return AE_OK; |
| } |
| |
| static acpi_status try_get_root_bridge_busnr(acpi_handle handle, |
| struct resource *res) |
| { |
| acpi_status status; |
| |
| res->start = -1; |
| status = |
| acpi_walk_resources(handle, METHOD_NAME__CRS, |
| get_root_bridge_busnr_callback, res); |
| if (ACPI_FAILURE(status)) |
| return status; |
| if (res->start == -1) |
| return AE_ERROR; |
| return AE_OK; |
| } |
| |
| struct pci_osc_bit_struct { |
| u32 bit; |
| char *desc; |
| }; |
| |
| static struct pci_osc_bit_struct pci_osc_support_bit[] = { |
| { OSC_PCI_EXT_CONFIG_SUPPORT, "ExtendedConfig" }, |
| { OSC_PCI_ASPM_SUPPORT, "ASPM" }, |
| { OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" }, |
| { OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" }, |
| { OSC_PCI_MSI_SUPPORT, "MSI" }, |
| { OSC_PCI_HPX_TYPE_3_SUPPORT, "HPX-Type3" }, |
| }; |
| |
| static struct pci_osc_bit_struct pci_osc_control_bit[] = { |
| { OSC_PCI_EXPRESS_NATIVE_HP_CONTROL, "PCIeHotplug" }, |
| { OSC_PCI_SHPC_NATIVE_HP_CONTROL, "SHPCHotplug" }, |
| { OSC_PCI_EXPRESS_PME_CONTROL, "PME" }, |
| { OSC_PCI_EXPRESS_AER_CONTROL, "AER" }, |
| { OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" }, |
| { OSC_PCI_EXPRESS_LTR_CONTROL, "LTR" }, |
| }; |
| |
| static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word, |
| struct pci_osc_bit_struct *table, int size) |
| { |
| char buf[80]; |
| int i, len = 0; |
| struct pci_osc_bit_struct *entry; |
| |
| buf[0] = '\0'; |
| for (i = 0, entry = table; i < size; i++, entry++) |
| if (word & entry->bit) |
| len += snprintf(buf + len, sizeof(buf) - len, "%s%s", |
| len ? " " : "", entry->desc); |
| |
| dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf); |
| } |
| |
| static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word) |
| { |
| decode_osc_bits(root, msg, word, pci_osc_support_bit, |
| ARRAY_SIZE(pci_osc_support_bit)); |
| } |
| |
| static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word) |
| { |
| decode_osc_bits(root, msg, word, pci_osc_control_bit, |
| ARRAY_SIZE(pci_osc_control_bit)); |
| } |
| |
| static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766"; |
| |
| static acpi_status acpi_pci_run_osc(acpi_handle handle, |
| const u32 *capbuf, u32 *retval) |
| { |
| struct acpi_osc_context context = { |
| .uuid_str = pci_osc_uuid_str, |
| .rev = 1, |
| .cap.length = 12, |
| .cap.pointer = (void *)capbuf, |
| }; |
| acpi_status status; |
| |
| status = acpi_run_osc(handle, &context); |
| if (ACPI_SUCCESS(status)) { |
| *retval = *((u32 *)(context.ret.pointer + 8)); |
| kfree(context.ret.pointer); |
| } |
| return status; |
| } |
| |
| static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, |
| u32 support, |
| u32 *control) |
| { |
| acpi_status status; |
| u32 result, capbuf[3]; |
| |
| support &= OSC_PCI_SUPPORT_MASKS; |
| support |= root->osc_support_set; |
| |
| capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; |
| capbuf[OSC_SUPPORT_DWORD] = support; |
| if (control) { |
| *control &= OSC_PCI_CONTROL_MASKS; |
| capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set; |
| } else { |
| /* Run _OSC query only with existing controls. */ |
| capbuf[OSC_CONTROL_DWORD] = root->osc_control_set; |
| } |
| |
| status = acpi_pci_run_osc(root->device->handle, capbuf, &result); |
| if (ACPI_SUCCESS(status)) { |
| root->osc_support_set = support; |
| if (control) |
| *control = result; |
| } |
| return status; |
| } |
| |
| static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags) |
| { |
| acpi_status status; |
| |
| mutex_lock(&osc_lock); |
| status = acpi_pci_query_osc(root, flags, NULL); |
| mutex_unlock(&osc_lock); |
| return status; |
| } |
| |
| struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle) |
| { |
| struct acpi_pci_root *root; |
| struct acpi_device *device; |
| |
| if (acpi_bus_get_device(handle, &device) || |
| acpi_match_device_ids(device, root_device_ids)) |
| return NULL; |
| |
| root = acpi_driver_data(device); |
| |
| return root; |
| } |
| EXPORT_SYMBOL_GPL(acpi_pci_find_root); |
| |
| struct acpi_handle_node { |
| struct list_head node; |
| acpi_handle handle; |
| }; |
| |
| /** |
| * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev |
| * @handle: the handle in question |
| * |
| * Given an ACPI CA handle, the desired PCI device is located in the |
| * list of PCI devices. |
| * |
| * If the device is found, its reference count is increased and this |
| * function returns a pointer to its data structure. The caller must |
| * decrement the reference count by calling pci_dev_put(). |
| * If no device is found, %NULL is returned. |
| */ |
| struct pci_dev *acpi_get_pci_dev(acpi_handle handle) |
| { |
| int dev, fn; |
| unsigned long long adr; |
| acpi_status status; |
| acpi_handle phandle; |
| struct pci_bus *pbus; |
| struct pci_dev *pdev = NULL; |
| struct acpi_handle_node *node, *tmp; |
| struct acpi_pci_root *root; |
| LIST_HEAD(device_list); |
| |
| /* |
| * Walk up the ACPI CA namespace until we reach a PCI root bridge. |
| */ |
| phandle = handle; |
| while (!acpi_is_root_bridge(phandle)) { |
| node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL); |
| if (!node) |
| goto out; |
| |
| INIT_LIST_HEAD(&node->node); |
| node->handle = phandle; |
| list_add(&node->node, &device_list); |
| |
| status = acpi_get_parent(phandle, &phandle); |
| if (ACPI_FAILURE(status)) |
| goto out; |
| } |
| |
| root = acpi_pci_find_root(phandle); |
| if (!root) |
| goto out; |
| |
| pbus = root->bus; |
| |
| /* |
| * Now, walk back down the PCI device tree until we return to our |
| * original handle. Assumes that everything between the PCI root |
| * bridge and the device we're looking for must be a P2P bridge. |
| */ |
| list_for_each_entry(node, &device_list, node) { |
| acpi_handle hnd = node->handle; |
| status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr); |
| if (ACPI_FAILURE(status)) |
| goto out; |
| dev = (adr >> 16) & 0xffff; |
| fn = adr & 0xffff; |
| |
| pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn)); |
| if (!pdev || hnd == handle) |
| break; |
| |
| pbus = pdev->subordinate; |
| pci_dev_put(pdev); |
| |
| /* |
| * This function may be called for a non-PCI device that has a |
| * PCI parent (eg. a disk under a PCI SATA controller). In that |
| * case pdev->subordinate will be NULL for the parent. |
| */ |
| if (!pbus) { |
| dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n"); |
| pdev = NULL; |
| break; |
| } |
| } |
| out: |
| list_for_each_entry_safe(node, tmp, &device_list, node) |
| kfree(node); |
| |
| return pdev; |
| } |
| EXPORT_SYMBOL_GPL(acpi_get_pci_dev); |
| |
| /** |
| * acpi_pci_osc_control_set - Request control of PCI root _OSC features. |
| * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex). |
| * @mask: Mask of _OSC bits to request control of, place to store control mask. |
| * @req: Mask of _OSC bits the control of is essential to the caller. |
| * |
| * Run _OSC query for @mask and if that is successful, compare the returned |
| * mask of control bits with @req. If all of the @req bits are set in the |
| * returned mask, run _OSC request for it. |
| * |
| * The variable at the @mask address may be modified regardless of whether or |
| * not the function returns success. On success it will contain the mask of |
| * _OSC bits the BIOS has granted control of, but its contents are meaningless |
| * on failure. |
| **/ |
| acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req) |
| { |
| struct acpi_pci_root *root; |
| acpi_status status = AE_OK; |
| u32 ctrl, capbuf[3]; |
| |
| if (!mask) |
| return AE_BAD_PARAMETER; |
| |
| ctrl = *mask & OSC_PCI_CONTROL_MASKS; |
| if ((ctrl & req) != req) |
| return AE_TYPE; |
| |
| root = acpi_pci_find_root(handle); |
| if (!root) |
| return AE_NOT_EXIST; |
| |
| mutex_lock(&osc_lock); |
| |
| *mask = ctrl | root->osc_control_set; |
| /* No need to evaluate _OSC if the control was already granted. */ |
| if ((root->osc_control_set & ctrl) == ctrl) |
| goto out; |
| |
| /* Need to check the available controls bits before requesting them. */ |
| while (*mask) { |
| status = acpi_pci_query_osc(root, root->osc_support_set, mask); |
| if (ACPI_FAILURE(status)) |
| goto out; |
| if (ctrl == *mask) |
| break; |
| decode_osc_control(root, "platform does not support", |
| ctrl & ~(*mask)); |
| ctrl = *mask; |
| } |
| |
| if ((ctrl & req) != req) { |
| decode_osc_control(root, "not requesting control; platform does not support", |
| req & ~(ctrl)); |
| status = AE_SUPPORT; |
| goto out; |
| } |
| |
| capbuf[OSC_QUERY_DWORD] = 0; |
| capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set; |
| capbuf[OSC_CONTROL_DWORD] = ctrl; |
| status = acpi_pci_run_osc(handle, capbuf, mask); |
| if (ACPI_SUCCESS(status)) |
| root->osc_control_set = *mask; |
| out: |
| mutex_unlock(&osc_lock); |
| return status; |
| } |
| EXPORT_SYMBOL(acpi_pci_osc_control_set); |
| |
| static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm, |
| bool is_pcie) |
| { |
| u32 support, control, requested; |
| acpi_status status; |
| struct acpi_device *device = root->device; |
| acpi_handle handle = device->handle; |
| |
| /* |
| * Apple always return failure on _OSC calls when _OSI("Darwin") has |
| * been called successfully. We know the feature set supported by the |
| * platform, so avoid calling _OSC at all |
| */ |
| if (x86_apple_machine) { |
| root->osc_control_set = ~OSC_PCI_EXPRESS_PME_CONTROL; |
| decode_osc_control(root, "OS assumes control of", |
| root->osc_control_set); |
| return; |
| } |
| |
| /* |
| * All supported architectures that use ACPI have support for |
| * PCI domains, so we indicate this in _OSC support capabilities. |
| */ |
| support = OSC_PCI_SEGMENT_GROUPS_SUPPORT; |
| support |= OSC_PCI_HPX_TYPE_3_SUPPORT; |
| if (pci_ext_cfg_avail()) |
| support |= OSC_PCI_EXT_CONFIG_SUPPORT; |
| if (pcie_aspm_support_enabled()) |
| support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT; |
| if (pci_msi_enabled()) |
| support |= OSC_PCI_MSI_SUPPORT; |
| |
| decode_osc_support(root, "OS supports", support); |
| status = acpi_pci_osc_support(root, support); |
| if (ACPI_FAILURE(status)) { |
| *no_aspm = 1; |
| |
| /* _OSC is optional for PCI host bridges */ |
| if ((status == AE_NOT_FOUND) && !is_pcie) |
| return; |
| |
| dev_info(&device->dev, "_OSC failed (%s)%s\n", |
| acpi_format_exception(status), |
| pcie_aspm_support_enabled() ? "; disabling ASPM" : ""); |
| return; |
| } |
| |
| if (pcie_ports_disabled) { |
| dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n"); |
| return; |
| } |
| |
| if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) { |
| decode_osc_support(root, "not requesting OS control; OS requires", |
| ACPI_PCIE_REQ_SUPPORT); |
| return; |
| } |
| |
| control = OSC_PCI_EXPRESS_CAPABILITY_CONTROL |
| | OSC_PCI_EXPRESS_PME_CONTROL; |
| |
| if (IS_ENABLED(CONFIG_PCIEASPM)) |
| control |= OSC_PCI_EXPRESS_LTR_CONTROL; |
| |
| if (IS_ENABLED(CONFIG_HOTPLUG_PCI_PCIE)) |
| control |= OSC_PCI_EXPRESS_NATIVE_HP_CONTROL; |
| |
| if (IS_ENABLED(CONFIG_HOTPLUG_PCI_SHPC)) |
| control |= OSC_PCI_SHPC_NATIVE_HP_CONTROL; |
| |
| if (pci_aer_available()) { |
| if (aer_acpi_firmware_first()) |
| dev_info(&device->dev, |
| "PCIe AER handled by firmware\n"); |
| else |
| control |= OSC_PCI_EXPRESS_AER_CONTROL; |
| } |
| |
| requested = control; |
| status = acpi_pci_osc_control_set(handle, &control, |
| OSC_PCI_EXPRESS_CAPABILITY_CONTROL); |
| if (ACPI_SUCCESS(status)) { |
| decode_osc_control(root, "OS now controls", control); |
| if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { |
| /* |
| * We have ASPM control, but the FADT indicates that |
| * it's unsupported. Leave existing configuration |
| * intact and prevent the OS from touching it. |
| */ |
| dev_info(&device->dev, "FADT indicates ASPM is unsupported, using BIOS configuration\n"); |
| *no_aspm = 1; |
| } |
| } else { |
| decode_osc_control(root, "OS requested", requested); |
| decode_osc_control(root, "platform willing to grant", control); |
| dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n", |
| acpi_format_exception(status)); |
| |
| /* |
| * We want to disable ASPM here, but aspm_disabled |
| * needs to remain in its state from boot so that we |
| * properly handle PCIe 1.1 devices. So we set this |
| * flag here, to defer the action until after the ACPI |
| * root scan. |
| */ |
| *no_aspm = 1; |
| } |
| } |
| |
| static int acpi_pci_root_add(struct acpi_device *device, |
| const struct acpi_device_id *not_used) |
| { |
| unsigned long long segment, bus; |
| acpi_status status; |
| int result; |
| struct acpi_pci_root *root; |
| acpi_handle handle = device->handle; |
| int no_aspm = 0; |
| bool hotadd = system_state == SYSTEM_RUNNING; |
| bool is_pcie; |
| |
| root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); |
| if (!root) |
| return -ENOMEM; |
| |
| segment = 0; |
| status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, |
| &segment); |
| if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { |
| dev_err(&device->dev, "can't evaluate _SEG\n"); |
| result = -ENODEV; |
| goto end; |
| } |
| |
| /* Check _CRS first, then _BBN. If no _BBN, default to zero. */ |
| root->secondary.flags = IORESOURCE_BUS; |
| status = try_get_root_bridge_busnr(handle, &root->secondary); |
| if (ACPI_FAILURE(status)) { |
| /* |
| * We need both the start and end of the downstream bus range |
| * to interpret _CBA (MMCONFIG base address), so it really is |
| * supposed to be in _CRS. If we don't find it there, all we |
| * can do is assume [_BBN-0xFF] or [0-0xFF]. |
| */ |
| root->secondary.end = 0xFF; |
| dev_warn(&device->dev, |
| FW_BUG "no secondary bus range in _CRS\n"); |
| status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, |
| NULL, &bus); |
| if (ACPI_SUCCESS(status)) |
| root->secondary.start = bus; |
| else if (status == AE_NOT_FOUND) |
| root->secondary.start = 0; |
| else { |
| dev_err(&device->dev, "can't evaluate _BBN\n"); |
| result = -ENODEV; |
| goto end; |
| } |
| } |
| |
| root->device = device; |
| root->segment = segment & 0xFFFF; |
| strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); |
| strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); |
| device->driver_data = root; |
| |
| if (hotadd && dmar_device_add(handle)) { |
| result = -ENXIO; |
| goto end; |
| } |
| |
| pr_info(PREFIX "%s [%s] (domain %04x %pR)\n", |
| acpi_device_name(device), acpi_device_bid(device), |
| root->segment, &root->secondary); |
| |
| root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle); |
| |
| is_pcie = strcmp(acpi_device_hid(device), "PNP0A08") == 0; |
| negotiate_os_control(root, &no_aspm, is_pcie); |
| |
| /* |
| * TBD: Need PCI interface for enumeration/configuration of roots. |
| */ |
| |
| /* |
| * Scan the Root Bridge |
| * -------------------- |
| * Must do this prior to any attempt to bind the root device, as the |
| * PCI namespace does not get created until this call is made (and |
| * thus the root bridge's pci_dev does not exist). |
| */ |
| root->bus = pci_acpi_scan_root(root); |
| if (!root->bus) { |
| dev_err(&device->dev, |
| "Bus %04x:%02x not present in PCI namespace\n", |
| root->segment, (unsigned int)root->secondary.start); |
| device->driver_data = NULL; |
| result = -ENODEV; |
| goto remove_dmar; |
| } |
| |
| if (no_aspm) |
| pcie_no_aspm(); |
| |
| pci_acpi_add_bus_pm_notifier(device); |
| device_set_wakeup_capable(root->bus->bridge, device->wakeup.flags.valid); |
| |
| if (hotadd) { |
| pcibios_resource_survey_bus(root->bus); |
| pci_assign_unassigned_root_bus_resources(root->bus); |
| /* |
| * This is only called for the hotadd case. For the boot-time |
| * case, we need to wait until after PCI initialization in |
| * order to deal with IOAPICs mapped in on a PCI BAR. |
| * |
| * This is currently x86-specific, because acpi_ioapic_add() |
| * is an empty function without CONFIG_ACPI_HOTPLUG_IOAPIC. |
| * And CONFIG_ACPI_HOTPLUG_IOAPIC depends on CONFIG_X86_IO_APIC |
| * (see drivers/acpi/Kconfig). |
| */ |
| acpi_ioapic_add(root->device->handle); |
| } |
| |
| pci_lock_rescan_remove(); |
| pci_bus_add_devices(root->bus); |
| pci_unlock_rescan_remove(); |
| return 1; |
| |
| remove_dmar: |
| if (hotadd) |
| dmar_device_remove(handle); |
| end: |
| kfree(root); |
| return result; |
| } |
| |
| static void acpi_pci_root_remove(struct acpi_device *device) |
| { |
| struct acpi_pci_root *root = acpi_driver_data(device); |
| |
| pci_lock_rescan_remove(); |
| |
| pci_stop_root_bus(root->bus); |
| |
| pci_ioapic_remove(root); |
| device_set_wakeup_capable(root->bus->bridge, false); |
| pci_acpi_remove_bus_pm_notifier(device); |
| |
| pci_remove_root_bus(root->bus); |
| WARN_ON(acpi_ioapic_remove(root)); |
| |
| dmar_device_remove(device->handle); |
| |
| pci_unlock_rescan_remove(); |
| |
| kfree(root); |
| } |
| |
| /* |
| * Following code to support acpi_pci_root_create() is copied from |
| * arch/x86/pci/acpi.c and modified so it could be reused by x86, IA64 |
| * and ARM64. |
| */ |
| static void acpi_pci_root_validate_resources(struct device *dev, |
| struct list_head *resources, |
| unsigned long type) |
| { |
| LIST_HEAD(list); |
| struct resource *res1, *res2, *root = NULL; |
| struct resource_entry *tmp, *entry, *entry2; |
| |
| BUG_ON((type & (IORESOURCE_MEM | IORESOURCE_IO)) == 0); |
| root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource; |
| |
| list_splice_init(resources, &list); |
| resource_list_for_each_entry_safe(entry, tmp, &list) { |
| bool free = false; |
| resource_size_t end; |
| |
| res1 = entry->res; |
| if (!(res1->flags & type)) |
| goto next; |
| |
| /* Exclude non-addressable range or non-addressable portion */ |
| end = min(res1->end, root->end); |
| if (end <= res1->start) { |
| dev_info(dev, "host bridge window %pR (ignored, not CPU addressable)\n", |
| res1); |
| free = true; |
| goto next; |
| } else if (res1->end != end) { |
| dev_info(dev, "host bridge window %pR ([%#llx-%#llx] ignored, not CPU addressable)\n", |
| res1, (unsigned long long)end + 1, |
| (unsigned long long)res1->end); |
| res1->end = end; |
| } |
| |
| resource_list_for_each_entry(entry2, resources) { |
| res2 = entry2->res; |
| if (!(res2->flags & type)) |
| continue; |
| |
| /* |
| * I don't like throwing away windows because then |
| * our resources no longer match the ACPI _CRS, but |
| * the kernel resource tree doesn't allow overlaps. |
| */ |
| if (resource_overlaps(res1, res2)) { |
| res2->start = min(res1->start, res2->start); |
| res2->end = max(res1->end, res2->end); |
| dev_info(dev, "host bridge window expanded to %pR; %pR ignored\n", |
| res2, res1); |
| free = true; |
| goto next; |
| } |
| } |
| |
| next: |
| resource_list_del(entry); |
| if (free) |
| resource_list_free_entry(entry); |
| else |
| resource_list_add_tail(entry, resources); |
| } |
| } |
| |
| static void acpi_pci_root_remap_iospace(struct fwnode_handle *fwnode, |
| struct resource_entry *entry) |
| { |
| #ifdef PCI_IOBASE |
| struct resource *res = entry->res; |
| resource_size_t cpu_addr = res->start; |
| resource_size_t pci_addr = cpu_addr - entry->offset; |
| resource_size_t length = resource_size(res); |
| unsigned long port; |
| |
| if (pci_register_io_range(fwnode, cpu_addr, length)) |
| goto err; |
| |
| port = pci_address_to_pio(cpu_addr); |
| if (port == (unsigned long)-1) |
| goto err; |
| |
| res->start = port; |
| res->end = port + length - 1; |
| entry->offset = port - pci_addr; |
| |
| if (pci_remap_iospace(res, cpu_addr) < 0) |
| goto err; |
| |
| pr_info("Remapped I/O %pa to %pR\n", &cpu_addr, res); |
| return; |
| err: |
| res->flags |= IORESOURCE_DISABLED; |
| #endif |
| } |
| |
| int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info) |
| { |
| int ret; |
| struct list_head *list = &info->resources; |
| struct acpi_device *device = info->bridge; |
| struct resource_entry *entry, *tmp; |
| unsigned long flags; |
| |
| flags = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_MEM_8AND16BIT; |
| ret = acpi_dev_get_resources(device, list, |
| acpi_dev_filter_resource_type_cb, |
| (void *)flags); |
| if (ret < 0) |
| dev_warn(&device->dev, |
| "failed to parse _CRS method, error code %d\n", ret); |
| else if (ret == 0) |
| dev_dbg(&device->dev, |
| "no IO and memory resources present in _CRS\n"); |
| else { |
| resource_list_for_each_entry_safe(entry, tmp, list) { |
| if (entry->res->flags & IORESOURCE_IO) |
| acpi_pci_root_remap_iospace(&device->fwnode, |
| entry); |
| |
| if (entry->res->flags & IORESOURCE_DISABLED) |
| resource_list_destroy_entry(entry); |
| else |
| entry->res->name = info->name; |
| } |
| acpi_pci_root_validate_resources(&device->dev, list, |
| IORESOURCE_MEM); |
| acpi_pci_root_validate_resources(&device->dev, list, |
| IORESOURCE_IO); |
| } |
| |
| return ret; |
| } |
| |
| static void pci_acpi_root_add_resources(struct acpi_pci_root_info *info) |
| { |
| struct resource_entry *entry, *tmp; |
| struct resource *res, *conflict, *root = NULL; |
| |
| resource_list_for_each_entry_safe(entry, tmp, &info->resources) { |
| res = entry->res; |
| if (res->flags & IORESOURCE_MEM) |
| root = &iomem_resource; |
| else if (res->flags & IORESOURCE_IO) |
| root = &ioport_resource; |
| else |
| continue; |
| |
| /* |
| * Some legacy x86 host bridge drivers use iomem_resource and |
| * ioport_resource as default resource pool, skip it. |
| */ |
| if (res == root) |
| continue; |
| |
| conflict = insert_resource_conflict(root, res); |
| if (conflict) { |
| dev_info(&info->bridge->dev, |
| "ignoring host bridge window %pR (conflicts with %s %pR)\n", |
| res, conflict->name, conflict); |
| resource_list_destroy_entry(entry); |
| } |
| } |
| } |
| |
| static void __acpi_pci_root_release_info(struct acpi_pci_root_info *info) |
| { |
| struct resource *res; |
| struct resource_entry *entry, *tmp; |
| |
| if (!info) |
| return; |
| |
| resource_list_for_each_entry_safe(entry, tmp, &info->resources) { |
| res = entry->res; |
| if (res->parent && |
| (res->flags & (IORESOURCE_MEM | IORESOURCE_IO))) |
| release_resource(res); |
| resource_list_destroy_entry(entry); |
| } |
| |
| info->ops->release_info(info); |
| } |
| |
| static void acpi_pci_root_release_info(struct pci_host_bridge *bridge) |
| { |
| struct resource *res; |
| struct resource_entry *entry; |
| |
| resource_list_for_each_entry(entry, &bridge->windows) { |
| res = entry->res; |
| if (res->flags & IORESOURCE_IO) |
| pci_unmap_iospace(res); |
| if (res->parent && |
| (res->flags & (IORESOURCE_MEM | IORESOURCE_IO))) |
| release_resource(res); |
| } |
| __acpi_pci_root_release_info(bridge->release_data); |
| } |
| |
| struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, |
| struct acpi_pci_root_ops *ops, |
| struct acpi_pci_root_info *info, |
| void *sysdata) |
| { |
| int ret, busnum = root->secondary.start; |
| struct acpi_device *device = root->device; |
| int node = acpi_get_node(device->handle); |
| struct pci_bus *bus; |
| struct pci_host_bridge *host_bridge; |
| |
| info->root = root; |
| info->bridge = device; |
| info->ops = ops; |
| INIT_LIST_HEAD(&info->resources); |
| snprintf(info->name, sizeof(info->name), "PCI Bus %04x:%02x", |
| root->segment, busnum); |
| |
| if (ops->init_info && ops->init_info(info)) |
| goto out_release_info; |
| if (ops->prepare_resources) |
| ret = ops->prepare_resources(info); |
| else |
| ret = acpi_pci_probe_root_resources(info); |
| if (ret < 0) |
| goto out_release_info; |
| |
| pci_acpi_root_add_resources(info); |
| pci_add_resource(&info->resources, &root->secondary); |
| bus = pci_create_root_bus(NULL, busnum, ops->pci_ops, |
| sysdata, &info->resources); |
| if (!bus) |
| goto out_release_info; |
| |
| host_bridge = to_pci_host_bridge(bus->bridge); |
| if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)) |
| host_bridge->native_pcie_hotplug = 0; |
| if (!(root->osc_control_set & OSC_PCI_SHPC_NATIVE_HP_CONTROL)) |
| host_bridge->native_shpc_hotplug = 0; |
| if (!(root->osc_control_set & OSC_PCI_EXPRESS_AER_CONTROL)) |
| host_bridge->native_aer = 0; |
| if (!(root->osc_control_set & OSC_PCI_EXPRESS_PME_CONTROL)) |
| host_bridge->native_pme = 0; |
| if (!(root->osc_control_set & OSC_PCI_EXPRESS_LTR_CONTROL)) |
| host_bridge->native_ltr = 0; |
| |
| pci_scan_child_bus(bus); |
| pci_set_host_bridge_release(host_bridge, acpi_pci_root_release_info, |
| info); |
| if (node != NUMA_NO_NODE) |
| dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node); |
| return bus; |
| |
| out_release_info: |
| __acpi_pci_root_release_info(info); |
| return NULL; |
| } |
| |
| void __init acpi_pci_root_init(void) |
| { |
| acpi_hest_init(); |
| if (acpi_pci_disabled) |
| return; |
| |
| pci_acpi_crs_quirks(); |
| acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root"); |
| } |