// 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> */ #define pr_fmt(fmt) "ACPI: " fmt #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/dmar.h> #include <linux/acpi.h> #include <linux/slab.h> #include <linux/dmi.h> #include <linux/platform_data/x86/apple.h> #include "internal.h" #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, }, }; /** * 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) { struct acpi_device *device = acpi_fetch_acpi_dev(handle); int ret; if (!device) 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_EDR_SUPPORT, "EDR" }, { 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" }, { OSC_PCI_EXPRESS_DPC_CONTROL, "DPC" }, }; static struct pci_osc_bit_struct cxl_osc_support_bit[] = { { OSC_CXL_1_1_PORT_REG_ACCESS_SUPPORT, "CXL11PortRegAccess" }, { OSC_CXL_2_0_PORT_DEV_REG_ACCESS_SUPPORT, "CXL20PortDevRegAccess" }, { OSC_CXL_PROTOCOL_ERR_REPORTING_SUPPORT, "CXLProtocolErrorReporting" }, { OSC_CXL_NATIVE_HP_SUPPORT, "CXLNativeHotPlug" }, }; static struct pci_osc_bit_struct cxl_osc_control_bit[] = { { OSC_CXL_ERROR_REPORTING_CONTROL, "CXLMemErrorReporting" }, }; 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 += scnprintf(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 void decode_cxl_osc_support(struct acpi_pci_root *root, char *msg, u32 word) { decode_osc_bits(root, msg, word, cxl_osc_support_bit, ARRAY_SIZE(cxl_osc_support_bit)); } static void decode_cxl_osc_control(struct acpi_pci_root *root, char *msg, u32 word) { decode_osc_bits(root, msg, word, cxl_osc_control_bit, ARRAY_SIZE(cxl_osc_control_bit)); } static inline bool is_pcie(struct acpi_pci_root *root) { return root->bridge_type == ACPI_BRIDGE_TYPE_PCIE; } static inline bool is_cxl(struct acpi_pci_root *root) { return root->bridge_type == ACPI_BRIDGE_TYPE_CXL; } static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766"; static u8 cxl_osc_uuid_str[] = "68F2D50B-C469-4d8A-BD3D-941A103FD3FC"; static char *to_uuid(struct acpi_pci_root *root) { if (is_cxl(root)) return cxl_osc_uuid_str; return pci_osc_uuid_str; } static int cap_length(struct acpi_pci_root *root) { if (is_cxl(root)) return sizeof(u32) * OSC_CXL_CAPABILITY_DWORDS; return sizeof(u32) * OSC_PCI_CAPABILITY_DWORDS; } static acpi_status acpi_pci_run_osc(struct acpi_pci_root *root, const u32 *capbuf, u32 *pci_control, u32 *cxl_control) { struct acpi_osc_context context = { .uuid_str = to_uuid(root), .rev = 1, .cap.length = cap_length(root), .cap.pointer = (void *)capbuf, }; acpi_status status; status = acpi_run_osc(root->device->handle, &context); if (ACPI_SUCCESS(status)) { *pci_control = acpi_osc_ctx_get_pci_control(&context); if (is_cxl(root)) *cxl_control = acpi_osc_ctx_get_cxl_control(&context); kfree(context.ret.pointer); } return status; } static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, u32 support, u32 *control, u32 cxl_support, u32 *cxl_control) { acpi_status status; u32 pci_result, cxl_result, capbuf[OSC_CXL_CAPABILITY_DWORDS]; support |= root->osc_support_set; capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; capbuf[OSC_SUPPORT_DWORD] = support; capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set; if (is_cxl(root)) { cxl_support |= root->osc_ext_support_set; capbuf[OSC_EXT_SUPPORT_DWORD] = cxl_support; capbuf[OSC_EXT_CONTROL_DWORD] = *cxl_control | root->osc_ext_control_set; } retry: status = acpi_pci_run_osc(root, capbuf, &pci_result, &cxl_result); if (ACPI_SUCCESS(status)) { root->osc_support_set = support; *control = pci_result; if (is_cxl(root)) { root->osc_ext_support_set = cxl_support; *cxl_control = cxl_result; } } else if (is_cxl(root)) { /* * CXL _OSC is optional on CXL 1.1 hosts. Fall back to PCIe _OSC * upon any failure using CXL _OSC. */ root->bridge_type = ACPI_BRIDGE_TYPE_PCIE; goto retry; } return status; } struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle) { struct acpi_device *device = acpi_fetch_acpi_dev(handle); struct acpi_pci_root *root; if (!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) { struct acpi_device *adev = acpi_fetch_acpi_dev(handle); struct acpi_device_physical_node *pn; struct pci_dev *pci_dev = NULL; if (!adev) return NULL; mutex_lock(&adev->physical_node_lock); list_for_each_entry(pn, &adev->physical_node_list, node) { if (dev_is_pci(pn->dev)) { get_device(pn->dev); pci_dev = to_pci_dev(pn->dev); break; } } mutex_unlock(&adev->physical_node_lock); return pci_dev; } 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. * @support: _OSC supported capability. * @cxl_mask: Mask of CXL _OSC control bits, place to store control mask. * @cxl_support: CXL _OSC supported capability. * * 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. **/ static acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 support, u32 *cxl_mask, u32 cxl_support) { u32 req = OSC_PCI_EXPRESS_CAPABILITY_CONTROL; struct acpi_pci_root *root; acpi_status status; u32 ctrl, cxl_ctrl = 0, capbuf[OSC_CXL_CAPABILITY_DWORDS]; if (!mask) return AE_BAD_PARAMETER; root = acpi_pci_find_root(handle); if (!root) return AE_NOT_EXIST; ctrl = *mask; *mask |= root->osc_control_set; if (is_cxl(root)) { cxl_ctrl = *cxl_mask; *cxl_mask |= root->osc_ext_control_set; } /* Need to check the available controls bits before requesting them. */ do { u32 pci_missing = 0, cxl_missing = 0; status = acpi_pci_query_osc(root, support, mask, cxl_support, cxl_mask); if (ACPI_FAILURE(status)) return status; if (is_cxl(root)) { if (ctrl == *mask && cxl_ctrl == *cxl_mask) break; pci_missing = ctrl & ~(*mask); cxl_missing = cxl_ctrl & ~(*cxl_mask); } else { if (ctrl == *mask) break; pci_missing = ctrl & ~(*mask); } if (pci_missing) decode_osc_control(root, "platform does not support", pci_missing); if (cxl_missing) decode_cxl_osc_control(root, "CXL platform does not support", cxl_missing); ctrl = *mask; cxl_ctrl = *cxl_mask; } while (*mask || *cxl_mask); /* No need to request _OSC if the control was already granted. */ if ((root->osc_control_set & ctrl) == ctrl && (root->osc_ext_control_set & cxl_ctrl) == cxl_ctrl) return AE_OK; if ((ctrl & req) != req) { decode_osc_control(root, "not requesting control; platform does not support", req & ~(ctrl)); return AE_SUPPORT; } capbuf[OSC_QUERY_DWORD] = 0; capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set; capbuf[OSC_CONTROL_DWORD] = ctrl; if (is_cxl(root)) { capbuf[OSC_EXT_SUPPORT_DWORD] = root->osc_ext_support_set; capbuf[OSC_EXT_CONTROL_DWORD] = cxl_ctrl; } status = acpi_pci_run_osc(root, capbuf, mask, cxl_mask); if (ACPI_FAILURE(status)) return status; root->osc_control_set = *mask; root->osc_ext_control_set = *cxl_mask; return AE_OK; } static u32 calculate_support(void) { u32 support; /* * 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; if (IS_ENABLED(CONFIG_PCIE_EDR)) support |= OSC_PCI_EDR_SUPPORT; return support; } /* * Background on hotplug support, and making it depend on only * CONFIG_HOTPLUG_PCI_PCIE vs. also considering CONFIG_MEMORY_HOTPLUG: * * CONFIG_ACPI_HOTPLUG_MEMORY does depend on CONFIG_MEMORY_HOTPLUG, but * there is no existing _OSC for memory hotplug support. The reason is that * ACPI memory hotplug requires the OS to acknowledge / coordinate with * memory plug events via a scan handler. On the CXL side the equivalent * would be if Linux supported the Mechanical Retention Lock [1], or * otherwise had some coordination for the driver of a PCI device * undergoing hotplug to be consulted on whether the hotplug should * proceed or not. * * The concern is that if Linux says no to supporting CXL hotplug then * the BIOS may say no to giving the OS hotplug control of any other PCIe * device. So the question here is not whether hotplug is enabled, it's * whether it is handled natively by the at all OS, and if * CONFIG_HOTPLUG_PCI_PCIE is enabled then the answer is "yes". * * Otherwise, the plan for CXL coordinated remove, since the kernel does * not support blocking hotplug, is to require the memory device to be * disabled before hotplug is attempted. When CONFIG_MEMORY_HOTPLUG is * disabled that step will fail and the remove attempt cancelled by the * user. If that is not honored and the card is removed anyway then it * does not matter if CONFIG_MEMORY_HOTPLUG is enabled or not, it will * cause a crash and other badness. * * Therefore, just say yes to CXL hotplug and require removal to * be coordinated by userspace unless and until the kernel grows better * mechanisms for doing "managed" removal of devices in consultation with * the driver. * * [1]: https://lore.kernel.org/all/20201122014203.4706-1-ashok.raj@intel.com/ */ static u32 calculate_cxl_support(void) { u32 support; support = OSC_CXL_2_0_PORT_DEV_REG_ACCESS_SUPPORT; support |= OSC_CXL_1_1_PORT_REG_ACCESS_SUPPORT; if (pci_aer_available()) support |= OSC_CXL_PROTOCOL_ERR_REPORTING_SUPPORT; if (IS_ENABLED(CONFIG_HOTPLUG_PCI_PCIE)) support |= OSC_CXL_NATIVE_HP_SUPPORT; return support; } static u32 calculate_control(void) { u32 control; 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()) control |= OSC_PCI_EXPRESS_AER_CONTROL; /* * Per the Downstream Port Containment Related Enhancements ECN to * the PCI Firmware Spec, r3.2, sec 4.5.1, table 4-5, * OSC_PCI_EXPRESS_DPC_CONTROL indicates the OS supports both DPC * and EDR. */ if (IS_ENABLED(CONFIG_PCIE_DPC) && IS_ENABLED(CONFIG_PCIE_EDR)) control |= OSC_PCI_EXPRESS_DPC_CONTROL; return control; } static u32 calculate_cxl_control(void) { u32 control = 0; if (IS_ENABLED(CONFIG_MEMORY_FAILURE)) control |= OSC_CXL_ERROR_REPORTING_CONTROL; return control; } static bool os_control_query_checks(struct acpi_pci_root *root, u32 support) { struct acpi_device *device = root->device; if (pcie_ports_disabled) { dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n"); return false; } 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 false; } return true; } static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm) { u32 support, control = 0, requested = 0; u32 cxl_support = 0, cxl_control = 0, cxl_requested = 0; 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; } support = calculate_support(); decode_osc_support(root, "OS supports", support); if (os_control_query_checks(root, support)) requested = control = calculate_control(); if (is_cxl(root)) { cxl_support = calculate_cxl_support(); decode_cxl_osc_support(root, "OS supports", cxl_support); cxl_requested = cxl_control = calculate_cxl_control(); } status = acpi_pci_osc_control_set(handle, &control, support, &cxl_control, cxl_support); if (ACPI_SUCCESS(status)) { if (control) decode_osc_control(root, "OS now controls", control); if (cxl_control) decode_cxl_osc_control(root, "OS now controls", cxl_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 { /* * 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; /* _OSC is optional for PCI host bridges */ if (status == AE_NOT_FOUND && !is_pcie(root)) return; if (control) { decode_osc_control(root, "OS requested", requested); decode_osc_control(root, "platform willing to grant", control); } if (cxl_control) { decode_cxl_osc_control(root, "OS requested", cxl_requested); decode_cxl_osc_control(root, "platform willing to grant", cxl_control); } dev_info(&device->dev, "_OSC: platform retains control of PCIe features (%s)\n", acpi_format_exception(status)); } } 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; const char *acpi_hid; 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("%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); acpi_hid = acpi_device_hid(root->device); if (strcmp(acpi_hid, "PNP0A08") == 0) root->bridge_type = ACPI_BRIDGE_TYPE_PCIE; else if (strcmp(acpi_hid, "ACPI0016") == 0) root->bridge_type = ACPI_BRIDGE_TYPE_CXL; else dev_dbg(&device->dev, "Assuming non-PCIe host bridge\n"); negotiate_os_control(root, &no_aspm); /* * 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_union(res1, res2, res2)) { 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; union acpi_object *obj; 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; if (!(root->osc_control_set & OSC_PCI_EXPRESS_DPC_CONTROL)) host_bridge->native_dpc = 0; /* * Evaluate the "PCI Boot Configuration" _DSM Function. If it * exists and returns 0, we must preserve any PCI resource * assignments made by firmware for this host bridge. */ obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), &pci_acpi_dsm_guid, 1, DSM_PCI_PRESERVE_BOOT_CONFIG, NULL); if (obj && obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 0) host_bridge->preserve_config = 1; ACPI_FREE(obj); acpi_dev_power_up_children_with_adr(device); 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) { if (acpi_pci_disabled) return; pci_acpi_crs_quirks(); acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root"); }