diff options
Diffstat (limited to 'drivers/acpi/pci_root.c')
| -rw-r--r-- | drivers/acpi/pci_root.c | 1081 |
1 files changed, 1081 insertions, 0 deletions
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c new file mode 100644 index 000000000..4e3db20e9 --- /dev/null +++ b/drivers/acpi/pci_root.c @@ -0,0 +1,1081 @@ +// 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; + 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"); +} |