Thomas Gleixner | c942fdd | 2019-05-27 08:55:06 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $) |
| 4 | * |
| 5 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> |
| 6 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | */ |
| 8 | |
Hanjun Guo | ccde83e | 2021-06-02 16:54:30 +0800 | [diff] [blame] | 9 | #define pr_fmt(fmt) "ACPI: " fmt |
| 10 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/kernel.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/types.h> |
Taku Izumi | d0020f6 | 2012-09-18 15:21:31 +0900 | [diff] [blame] | 15 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/pm.h> |
Rafael J. Wysocki | b67ea76 | 2010-02-17 23:44:09 +0100 | [diff] [blame] | 17 | #include <linux/pm_runtime.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/pci.h> |
Andrew Patterson | 990a7ac | 2008-11-10 15:30:45 -0700 | [diff] [blame] | 19 | #include <linux/pci-acpi.h> |
Jiang Liu | 864b94a | 2014-11-09 22:48:03 +0800 | [diff] [blame] | 20 | #include <linux/dmar.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/acpi.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 22 | #include <linux/slab.h> |
Matthew Garrett | 7bc5a2b | 2014-09-20 13:19:47 +0200 | [diff] [blame] | 23 | #include <linux/dmi.h> |
Lukas Wunner | 630b3af | 2017-08-01 14:10:41 +0200 | [diff] [blame] | 24 | #include <linux/platform_data/x86/apple.h> |
Rafael J. Wysocki | ace8238 | 2013-11-07 01:41:48 +0100 | [diff] [blame] | 25 | #include "internal.h" |
| 26 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #define ACPI_PCI_ROOT_CLASS "pci_bridge" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge" |
Rafael J. Wysocki | 00c43b9 | 2013-01-30 14:27:33 +0100 | [diff] [blame] | 29 | static int acpi_pci_root_add(struct acpi_device *device, |
| 30 | const struct acpi_device_id *not_used); |
| 31 | static void acpi_pci_root_remove(struct acpi_device *device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
Rafael J. Wysocki | 3338db0 | 2013-11-22 21:55:20 +0100 | [diff] [blame] | 33 | static int acpi_pci_root_scan_dependent(struct acpi_device *adev) |
| 34 | { |
Rafael J. Wysocki | 1f7c164 | 2014-02-04 00:45:13 +0100 | [diff] [blame] | 35 | acpiphp_check_host_bridge(adev); |
Rafael J. Wysocki | 3338db0 | 2013-11-22 21:55:20 +0100 | [diff] [blame] | 36 | return 0; |
| 37 | } |
| 38 | |
Bjorn Helgaas | 7dab9ef | 2013-09-05 15:07:39 -0600 | [diff] [blame] | 39 | #define ACPI_PCIE_REQ_SUPPORT (OSC_PCI_EXT_CONFIG_SUPPORT \ |
| 40 | | OSC_PCI_ASPM_SUPPORT \ |
| 41 | | OSC_PCI_CLOCK_PM_SUPPORT \ |
| 42 | | OSC_PCI_MSI_SUPPORT) |
Rafael J. Wysocki | 415e12b | 2011-01-07 00:55:09 +0100 | [diff] [blame] | 43 | |
Márton Németh | c97adf9 | 2010-01-10 17:15:36 +0100 | [diff] [blame] | 44 | static const struct acpi_device_id root_device_ids[] = { |
Thomas Renninger | 1ba90e3 | 2007-07-23 14:44:41 +0200 | [diff] [blame] | 45 | {"PNP0A03", 0}, |
| 46 | {"", 0}, |
| 47 | }; |
Thomas Renninger | 1ba90e3 | 2007-07-23 14:44:41 +0200 | [diff] [blame] | 48 | |
Rafael J. Wysocki | 00c43b9 | 2013-01-30 14:27:33 +0100 | [diff] [blame] | 49 | static struct acpi_scan_handler pci_root_handler = { |
Thomas Renninger | 1ba90e3 | 2007-07-23 14:44:41 +0200 | [diff] [blame] | 50 | .ids = root_device_ids, |
Rafael J. Wysocki | 00c43b9 | 2013-01-30 14:27:33 +0100 | [diff] [blame] | 51 | .attach = acpi_pci_root_add, |
| 52 | .detach = acpi_pci_root_remove, |
Toshi Kani | ca499fc | 2013-11-20 14:25:34 +0100 | [diff] [blame] | 53 | .hotplug = { |
Rafael J. Wysocki | 3338db0 | 2013-11-22 21:55:20 +0100 | [diff] [blame] | 54 | .enabled = true, |
| 55 | .scan_dependent = acpi_pci_root_scan_dependent, |
Toshi Kani | ca499fc | 2013-11-20 14:25:34 +0100 | [diff] [blame] | 56 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | }; |
| 58 | |
Alexander Chiang | 2755820 | 2009-06-10 19:55:14 +0000 | [diff] [blame] | 59 | /** |
| 60 | * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge |
Tian Tao | 8e8883c | 2020-09-22 10:32:25 +0800 | [diff] [blame] | 61 | * @handle: the ACPI CA node in question. |
Alexander Chiang | 2755820 | 2009-06-10 19:55:14 +0000 | [diff] [blame] | 62 | * |
| 63 | * Note: we could make this API take a struct acpi_device * instead, but |
| 64 | * for now, it's more convenient to operate on an acpi_handle. |
| 65 | */ |
| 66 | int acpi_is_root_bridge(acpi_handle handle) |
| 67 | { |
Rafael J. Wysocki | 99ece71 | 2021-12-03 17:37:10 +0100 | [diff] [blame] | 68 | struct acpi_device *device = acpi_fetch_acpi_dev(handle); |
Alexander Chiang | 2755820 | 2009-06-10 19:55:14 +0000 | [diff] [blame] | 69 | int ret; |
Alexander Chiang | 2755820 | 2009-06-10 19:55:14 +0000 | [diff] [blame] | 70 | |
Rafael J. Wysocki | 99ece71 | 2021-12-03 17:37:10 +0100 | [diff] [blame] | 71 | if (!device) |
Alexander Chiang | 2755820 | 2009-06-10 19:55:14 +0000 | [diff] [blame] | 72 | return 0; |
| 73 | |
| 74 | ret = acpi_match_device_ids(device, root_device_ids); |
| 75 | if (ret) |
| 76 | return 0; |
| 77 | else |
| 78 | return 1; |
| 79 | } |
| 80 | EXPORT_SYMBOL_GPL(acpi_is_root_bridge); |
| 81 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | static acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 83 | get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | { |
Bjorn Helgaas | 6ad9551 | 2010-03-11 12:20:06 -0700 | [diff] [blame] | 85 | struct resource *res = data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | struct acpi_resource_address64 address; |
Bjorn Helgaas | f6c1c8f | 2012-06-21 23:48:50 -0600 | [diff] [blame] | 87 | acpi_status status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
Bjorn Helgaas | f6c1c8f | 2012-06-21 23:48:50 -0600 | [diff] [blame] | 89 | status = acpi_resource_to_address64(resource, &address); |
| 90 | if (ACPI_FAILURE(status)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | return AE_OK; |
| 92 | |
Lv Zheng | a45de93 | 2015-01-26 16:58:56 +0800 | [diff] [blame] | 93 | if ((address.address.address_length > 0) && |
Bjorn Helgaas | 6ad9551 | 2010-03-11 12:20:06 -0700 | [diff] [blame] | 94 | (address.resource_type == ACPI_BUS_NUMBER_RANGE)) { |
Lv Zheng | a45de93 | 2015-01-26 16:58:56 +0800 | [diff] [blame] | 95 | res->start = address.address.minimum; |
| 96 | res->end = address.address.minimum + address.address.address_length - 1; |
Bjorn Helgaas | 6ad9551 | 2010-03-11 12:20:06 -0700 | [diff] [blame] | 97 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | |
| 99 | return AE_OK; |
| 100 | } |
| 101 | |
Bjorn Helgaas | f5eebbe | 2009-06-18 14:46:52 -0600 | [diff] [blame] | 102 | static acpi_status try_get_root_bridge_busnr(acpi_handle handle, |
Bjorn Helgaas | 6ad9551 | 2010-03-11 12:20:06 -0700 | [diff] [blame] | 103 | struct resource *res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | { |
| 105 | acpi_status status; |
| 106 | |
Bjorn Helgaas | 6ad9551 | 2010-03-11 12:20:06 -0700 | [diff] [blame] | 107 | res->start = -1; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 108 | status = |
| 109 | acpi_walk_resources(handle, METHOD_NAME__CRS, |
Bjorn Helgaas | 6ad9551 | 2010-03-11 12:20:06 -0700 | [diff] [blame] | 110 | get_root_bridge_busnr_callback, res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | if (ACPI_FAILURE(status)) |
| 112 | return status; |
Bjorn Helgaas | 6ad9551 | 2010-03-11 12:20:06 -0700 | [diff] [blame] | 113 | if (res->start == -1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | return AE_ERROR; |
| 115 | return AE_OK; |
| 116 | } |
| 117 | |
Bjorn Helgaas | 955f14b | 2013-09-05 15:07:45 -0600 | [diff] [blame] | 118 | struct pci_osc_bit_struct { |
| 119 | u32 bit; |
| 120 | char *desc; |
| 121 | }; |
| 122 | |
| 123 | static struct pci_osc_bit_struct pci_osc_support_bit[] = { |
| 124 | { OSC_PCI_EXT_CONFIG_SUPPORT, "ExtendedConfig" }, |
| 125 | { OSC_PCI_ASPM_SUPPORT, "ASPM" }, |
| 126 | { OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" }, |
| 127 | { OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" }, |
| 128 | { OSC_PCI_MSI_SUPPORT, "MSI" }, |
Kuppuswamy Sathyanarayanan | ac1c8e3 | 2020-03-23 17:26:07 -0700 | [diff] [blame] | 129 | { OSC_PCI_EDR_SUPPORT, "EDR" }, |
Alexandru Gagniuc | ba11edc | 2019-03-15 14:29:40 -0500 | [diff] [blame] | 130 | { OSC_PCI_HPX_TYPE_3_SUPPORT, "HPX-Type3" }, |
Bjorn Helgaas | 955f14b | 2013-09-05 15:07:45 -0600 | [diff] [blame] | 131 | }; |
| 132 | |
| 133 | static struct pci_osc_bit_struct pci_osc_control_bit[] = { |
| 134 | { OSC_PCI_EXPRESS_NATIVE_HP_CONTROL, "PCIeHotplug" }, |
| 135 | { OSC_PCI_SHPC_NATIVE_HP_CONTROL, "SHPCHotplug" }, |
| 136 | { OSC_PCI_EXPRESS_PME_CONTROL, "PME" }, |
| 137 | { OSC_PCI_EXPRESS_AER_CONTROL, "AER" }, |
| 138 | { OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" }, |
Bjorn Helgaas | af8bb9f | 2018-04-17 10:58:09 -0500 | [diff] [blame] | 139 | { OSC_PCI_EXPRESS_LTR_CONTROL, "LTR" }, |
Kuppuswamy Sathyanarayanan | ac1c8e3 | 2020-03-23 17:26:07 -0700 | [diff] [blame] | 140 | { OSC_PCI_EXPRESS_DPC_CONTROL, "DPC" }, |
Bjorn Helgaas | 955f14b | 2013-09-05 15:07:45 -0600 | [diff] [blame] | 141 | }; |
| 142 | |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 143 | static struct pci_osc_bit_struct cxl_osc_support_bit[] = { |
| 144 | { OSC_CXL_1_1_PORT_REG_ACCESS_SUPPORT, "CXL11PortRegAccess" }, |
| 145 | { OSC_CXL_2_0_PORT_DEV_REG_ACCESS_SUPPORT, "CXL20PortDevRegAccess" }, |
| 146 | { OSC_CXL_PROTOCOL_ERR_REPORTING_SUPPORT, "CXLProtocolErrorReporting" }, |
| 147 | { OSC_CXL_NATIVE_HP_SUPPORT, "CXLNativeHotPlug" }, |
| 148 | }; |
| 149 | |
| 150 | static struct pci_osc_bit_struct cxl_osc_control_bit[] = { |
| 151 | { OSC_CXL_ERROR_REPORTING_CONTROL, "CXLMemErrorReporting" }, |
| 152 | }; |
| 153 | |
Bjorn Helgaas | 955f14b | 2013-09-05 15:07:45 -0600 | [diff] [blame] | 154 | static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word, |
| 155 | struct pci_osc_bit_struct *table, int size) |
| 156 | { |
| 157 | char buf[80]; |
| 158 | int i, len = 0; |
| 159 | struct pci_osc_bit_struct *entry; |
| 160 | |
| 161 | buf[0] = '\0'; |
| 162 | for (i = 0, entry = table; i < size; i++, entry++) |
| 163 | if (word & entry->bit) |
Takashi Iwai | edd6608 | 2020-03-11 08:09:58 +0100 | [diff] [blame] | 164 | len += scnprintf(buf + len, sizeof(buf) - len, "%s%s", |
Bjorn Helgaas | 955f14b | 2013-09-05 15:07:45 -0600 | [diff] [blame] | 165 | len ? " " : "", entry->desc); |
| 166 | |
| 167 | dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf); |
| 168 | } |
| 169 | |
| 170 | static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word) |
| 171 | { |
| 172 | decode_osc_bits(root, msg, word, pci_osc_support_bit, |
| 173 | ARRAY_SIZE(pci_osc_support_bit)); |
| 174 | } |
| 175 | |
| 176 | static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word) |
| 177 | { |
| 178 | decode_osc_bits(root, msg, word, pci_osc_control_bit, |
| 179 | ARRAY_SIZE(pci_osc_control_bit)); |
| 180 | } |
| 181 | |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 182 | static void decode_cxl_osc_support(struct acpi_pci_root *root, char *msg, u32 word) |
| 183 | { |
| 184 | decode_osc_bits(root, msg, word, cxl_osc_support_bit, |
| 185 | ARRAY_SIZE(cxl_osc_support_bit)); |
| 186 | } |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 187 | |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 188 | static void decode_cxl_osc_control(struct acpi_pci_root *root, char *msg, u32 word) |
| 189 | { |
| 190 | decode_osc_bits(root, msg, word, cxl_osc_control_bit, |
| 191 | ARRAY_SIZE(cxl_osc_control_bit)); |
| 192 | } |
| 193 | |
Dan Williams | 241d26b | 2022-04-13 01:36:17 -0600 | [diff] [blame] | 194 | static inline bool is_pcie(struct acpi_pci_root *root) |
| 195 | { |
| 196 | return root->bridge_type == ACPI_BRIDGE_TYPE_PCIE; |
| 197 | } |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 198 | |
Dan Williams | 241d26b | 2022-04-13 01:36:17 -0600 | [diff] [blame] | 199 | static inline bool is_cxl(struct acpi_pci_root *root) |
| 200 | { |
| 201 | return root->bridge_type == ACPI_BRIDGE_TYPE_CXL; |
| 202 | } |
| 203 | |
| 204 | static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766"; |
| 205 | static u8 cxl_osc_uuid_str[] = "68F2D50B-C469-4d8A-BD3D-941A103FD3FC"; |
| 206 | |
| 207 | static char *to_uuid(struct acpi_pci_root *root) |
| 208 | { |
| 209 | if (is_cxl(root)) |
| 210 | return cxl_osc_uuid_str; |
| 211 | return pci_osc_uuid_str; |
| 212 | } |
| 213 | |
| 214 | static int cap_length(struct acpi_pci_root *root) |
| 215 | { |
| 216 | if (is_cxl(root)) |
| 217 | return sizeof(u32) * OSC_CXL_CAPABILITY_DWORDS; |
| 218 | return sizeof(u32) * OSC_PCI_CAPABILITY_DWORDS; |
| 219 | } |
| 220 | |
| 221 | static acpi_status acpi_pci_run_osc(struct acpi_pci_root *root, |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 222 | const u32 *capbuf, u32 *pci_control, |
| 223 | u32 *cxl_control) |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 224 | { |
Shaohua Li | 3a9622d | 2009-10-29 11:04:50 +0800 | [diff] [blame] | 225 | struct acpi_osc_context context = { |
Dan Williams | 241d26b | 2022-04-13 01:36:17 -0600 | [diff] [blame] | 226 | .uuid_str = to_uuid(root), |
Shaohua Li | 3a9622d | 2009-10-29 11:04:50 +0800 | [diff] [blame] | 227 | .rev = 1, |
Dan Williams | 241d26b | 2022-04-13 01:36:17 -0600 | [diff] [blame] | 228 | .cap.length = cap_length(root), |
Shaohua Li | 3a9622d | 2009-10-29 11:04:50 +0800 | [diff] [blame] | 229 | .cap.pointer = (void *)capbuf, |
| 230 | }; |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 231 | acpi_status status; |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 232 | |
Dan Williams | 241d26b | 2022-04-13 01:36:17 -0600 | [diff] [blame] | 233 | status = acpi_run_osc(root->device->handle, &context); |
Shaohua Li | 3a9622d | 2009-10-29 11:04:50 +0800 | [diff] [blame] | 234 | if (ACPI_SUCCESS(status)) { |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 235 | *pci_control = acpi_osc_ctx_get_pci_control(&context); |
| 236 | if (is_cxl(root)) |
| 237 | *cxl_control = acpi_osc_ctx_get_cxl_control(&context); |
Shaohua Li | 3a9622d | 2009-10-29 11:04:50 +0800 | [diff] [blame] | 238 | kfree(context.ret.pointer); |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 239 | } |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 240 | return status; |
| 241 | } |
| 242 | |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 243 | static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, u32 support, |
| 244 | u32 *control, u32 cxl_support, |
| 245 | u32 *cxl_control) |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 246 | { |
| 247 | acpi_status status; |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 248 | u32 pci_result, cxl_result, capbuf[OSC_CXL_CAPABILITY_DWORDS]; |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 249 | |
Rafael J. Wysocki | ab8e895 | 2010-08-21 01:53:27 +0200 | [diff] [blame] | 250 | support |= root->osc_support_set; |
| 251 | |
Bjorn Helgaas | b938a22 | 2013-09-05 15:05:54 -0600 | [diff] [blame] | 252 | capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; |
| 253 | capbuf[OSC_SUPPORT_DWORD] = support; |
Joerg Roedel | 6bc779e | 2021-08-24 14:20:54 +0200 | [diff] [blame] | 254 | capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set; |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 255 | |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 256 | if (is_cxl(root)) { |
| 257 | cxl_support |= root->osc_ext_support_set; |
| 258 | capbuf[OSC_EXT_SUPPORT_DWORD] = cxl_support; |
| 259 | capbuf[OSC_EXT_CONTROL_DWORD] = *cxl_control | root->osc_ext_control_set; |
| 260 | } |
| 261 | |
Dan Williams | 241d26b | 2022-04-13 01:36:17 -0600 | [diff] [blame] | 262 | retry: |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 263 | status = acpi_pci_run_osc(root, capbuf, &pci_result, &cxl_result); |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 264 | if (ACPI_SUCCESS(status)) { |
Rafael J. Wysocki | ab8e895 | 2010-08-21 01:53:27 +0200 | [diff] [blame] | 265 | root->osc_support_set = support; |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 266 | *control = pci_result; |
| 267 | if (is_cxl(root)) { |
| 268 | root->osc_ext_support_set = cxl_support; |
| 269 | *cxl_control = cxl_result; |
| 270 | } |
Dan Williams | 241d26b | 2022-04-13 01:36:17 -0600 | [diff] [blame] | 271 | } else if (is_cxl(root)) { |
| 272 | /* |
| 273 | * CXL _OSC is optional on CXL 1.1 hosts. Fall back to PCIe _OSC |
| 274 | * upon any failure using CXL _OSC. |
| 275 | */ |
| 276 | root->bridge_type = ACPI_BRIDGE_TYPE_PCIE; |
| 277 | goto retry; |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 278 | } |
| 279 | return status; |
| 280 | } |
| 281 | |
Alex Chiang | 76d56de | 2009-07-23 17:03:00 -0600 | [diff] [blame] | 282 | struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle) |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 283 | { |
Rafael J. Wysocki | 99ece71 | 2021-12-03 17:37:10 +0100 | [diff] [blame] | 284 | struct acpi_device *device = acpi_fetch_acpi_dev(handle); |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 285 | struct acpi_pci_root *root; |
Bjorn Helgaas | c1aec83 | 2009-06-18 14:47:02 -0600 | [diff] [blame] | 286 | |
Rafael J. Wysocki | 99ece71 | 2021-12-03 17:37:10 +0100 | [diff] [blame] | 287 | if (!device || acpi_match_device_ids(device, root_device_ids)) |
Taku Izumi | cd4faf9 | 2012-09-18 15:23:23 +0900 | [diff] [blame] | 288 | return NULL; |
| 289 | |
| 290 | root = acpi_driver_data(device); |
| 291 | |
| 292 | return root; |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 293 | } |
Alex Chiang | 76d56de | 2009-07-23 17:03:00 -0600 | [diff] [blame] | 294 | EXPORT_SYMBOL_GPL(acpi_pci_find_root); |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 295 | |
Alexander Chiang | 2f7bbce | 2009-06-10 19:55:20 +0000 | [diff] [blame] | 296 | /** |
| 297 | * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev |
| 298 | * @handle: the handle in question |
| 299 | * |
| 300 | * Given an ACPI CA handle, the desired PCI device is located in the |
| 301 | * list of PCI devices. |
| 302 | * |
| 303 | * If the device is found, its reference count is increased and this |
| 304 | * function returns a pointer to its data structure. The caller must |
| 305 | * decrement the reference count by calling pci_dev_put(). |
| 306 | * If no device is found, %NULL is returned. |
| 307 | */ |
| 308 | struct pci_dev *acpi_get_pci_dev(acpi_handle handle) |
| 309 | { |
Rafael J. Wysocki | 63f534b | 2022-09-10 15:23:46 +0200 | [diff] [blame] | 310 | struct acpi_device *adev = acpi_fetch_acpi_dev(handle); |
| 311 | struct acpi_device_physical_node *pn; |
| 312 | struct pci_dev *pci_dev = NULL; |
Alexander Chiang | 2f7bbce | 2009-06-10 19:55:20 +0000 | [diff] [blame] | 313 | |
Rafael J. Wysocki | 63f534b | 2022-09-10 15:23:46 +0200 | [diff] [blame] | 314 | if (!adev) |
| 315 | return NULL; |
Alexander Chiang | 2f7bbce | 2009-06-10 19:55:20 +0000 | [diff] [blame] | 316 | |
Rafael J. Wysocki | 63f534b | 2022-09-10 15:23:46 +0200 | [diff] [blame] | 317 | mutex_lock(&adev->physical_node_lock); |
Alexander Chiang | 2f7bbce | 2009-06-10 19:55:20 +0000 | [diff] [blame] | 318 | |
Rafael J. Wysocki | 63f534b | 2022-09-10 15:23:46 +0200 | [diff] [blame] | 319 | list_for_each_entry(pn, &adev->physical_node_list, node) { |
| 320 | if (dev_is_pci(pn->dev)) { |
Rafael J. Wysocki | eb1d3926 | 2022-10-18 19:34:03 +0200 | [diff] [blame] | 321 | get_device(pn->dev); |
Rafael J. Wysocki | 63f534b | 2022-09-10 15:23:46 +0200 | [diff] [blame] | 322 | pci_dev = to_pci_dev(pn->dev); |
Rafael J. Wysocki | 497fb54 | 2009-10-13 01:01:57 +0200 | [diff] [blame] | 323 | break; |
| 324 | } |
Alexander Chiang | 2f7bbce | 2009-06-10 19:55:20 +0000 | [diff] [blame] | 325 | } |
Alexander Chiang | 2f7bbce | 2009-06-10 19:55:20 +0000 | [diff] [blame] | 326 | |
Rafael J. Wysocki | 63f534b | 2022-09-10 15:23:46 +0200 | [diff] [blame] | 327 | mutex_unlock(&adev->physical_node_lock); |
| 328 | |
| 329 | return pci_dev; |
Alexander Chiang | 2f7bbce | 2009-06-10 19:55:20 +0000 | [diff] [blame] | 330 | } |
| 331 | EXPORT_SYMBOL_GPL(acpi_get_pci_dev); |
| 332 | |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 333 | /** |
Rafael J. Wysocki | 75fb60f | 2010-08-23 23:53:11 +0200 | [diff] [blame] | 334 | * acpi_pci_osc_control_set - Request control of PCI root _OSC features. |
| 335 | * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex). |
| 336 | * @mask: Mask of _OSC bits to request control of, place to store control mask. |
Yang Li | 843438d | 2021-12-23 10:28:56 +0800 | [diff] [blame] | 337 | * @support: _OSC supported capability. |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 338 | * @cxl_mask: Mask of CXL _OSC control bits, place to store control mask. |
| 339 | * @cxl_support: CXL _OSC supported capability. |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 340 | * |
Rafael J. Wysocki | 75fb60f | 2010-08-23 23:53:11 +0200 | [diff] [blame] | 341 | * Run _OSC query for @mask and if that is successful, compare the returned |
| 342 | * mask of control bits with @req. If all of the @req bits are set in the |
| 343 | * returned mask, run _OSC request for it. |
| 344 | * |
| 345 | * The variable at the @mask address may be modified regardless of whether or |
| 346 | * not the function returns success. On success it will contain the mask of |
| 347 | * _OSC bits the BIOS has granted control of, but its contents are meaningless |
| 348 | * on failure. |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 349 | **/ |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 350 | static acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, |
| 351 | u32 support, u32 *cxl_mask, |
| 352 | u32 cxl_support) |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 353 | { |
Joerg Roedel | 6bc779e | 2021-08-24 14:20:54 +0200 | [diff] [blame] | 354 | u32 req = OSC_PCI_EXPRESS_CAPABILITY_CONTROL; |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 355 | struct acpi_pci_root *root; |
Bjorn Helgaas | 866e61f | 2020-06-02 17:27:33 -0500 | [diff] [blame] | 356 | acpi_status status; |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 357 | u32 ctrl, cxl_ctrl = 0, capbuf[OSC_CXL_CAPABILITY_DWORDS]; |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 358 | |
Rafael J. Wysocki | 75fb60f | 2010-08-23 23:53:11 +0200 | [diff] [blame] | 359 | if (!mask) |
| 360 | return AE_BAD_PARAMETER; |
| 361 | |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 362 | root = acpi_pci_find_root(handle); |
| 363 | if (!root) |
| 364 | return AE_NOT_EXIST; |
| 365 | |
Joerg Roedel | 6bc779e | 2021-08-24 14:20:54 +0200 | [diff] [blame] | 366 | ctrl = *mask; |
| 367 | *mask |= root->osc_control_set; |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 368 | |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 369 | if (is_cxl(root)) { |
| 370 | cxl_ctrl = *cxl_mask; |
| 371 | *cxl_mask |= root->osc_ext_control_set; |
| 372 | } |
| 373 | |
Rafael J. Wysocki | 75fb60f | 2010-08-23 23:53:11 +0200 | [diff] [blame] | 374 | /* Need to check the available controls bits before requesting them. */ |
Joerg Roedel | 6bc779e | 2021-08-24 14:20:54 +0200 | [diff] [blame] | 375 | do { |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 376 | u32 pci_missing = 0, cxl_missing = 0; |
| 377 | |
| 378 | status = acpi_pci_query_osc(root, support, mask, cxl_support, |
| 379 | cxl_mask); |
Rafael J. Wysocki | 75fb60f | 2010-08-23 23:53:11 +0200 | [diff] [blame] | 380 | if (ACPI_FAILURE(status)) |
Bjorn Helgaas | 866e61f | 2020-06-02 17:27:33 -0500 | [diff] [blame] | 381 | return status; |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 382 | if (is_cxl(root)) { |
| 383 | if (ctrl == *mask && cxl_ctrl == *cxl_mask) |
| 384 | break; |
| 385 | pci_missing = ctrl & ~(*mask); |
| 386 | cxl_missing = cxl_ctrl & ~(*cxl_mask); |
| 387 | } else { |
| 388 | if (ctrl == *mask) |
| 389 | break; |
| 390 | pci_missing = ctrl & ~(*mask); |
| 391 | } |
| 392 | if (pci_missing) |
| 393 | decode_osc_control(root, "platform does not support", |
| 394 | pci_missing); |
| 395 | if (cxl_missing) |
| 396 | decode_cxl_osc_control(root, "CXL platform does not support", |
| 397 | cxl_missing); |
Rafael J. Wysocki | 75fb60f | 2010-08-23 23:53:11 +0200 | [diff] [blame] | 398 | ctrl = *mask; |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 399 | cxl_ctrl = *cxl_mask; |
| 400 | } while (*mask || *cxl_mask); |
Joerg Roedel | 6bc779e | 2021-08-24 14:20:54 +0200 | [diff] [blame] | 401 | |
| 402 | /* No need to request _OSC if the control was already granted. */ |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 403 | if ((root->osc_control_set & ctrl) == ctrl && |
| 404 | (root->osc_ext_control_set & cxl_ctrl) == cxl_ctrl) |
Joerg Roedel | 6bc779e | 2021-08-24 14:20:54 +0200 | [diff] [blame] | 405 | return AE_OK; |
Rafael J. Wysocki | 2b8fd91 | 2010-08-23 23:55:59 +0200 | [diff] [blame] | 406 | |
Rafael J. Wysocki | 75fb60f | 2010-08-23 23:53:11 +0200 | [diff] [blame] | 407 | if ((ctrl & req) != req) { |
Bjorn Helgaas | 955f14b | 2013-09-05 15:07:45 -0600 | [diff] [blame] | 408 | decode_osc_control(root, "not requesting control; platform does not support", |
| 409 | req & ~(ctrl)); |
Bjorn Helgaas | 866e61f | 2020-06-02 17:27:33 -0500 | [diff] [blame] | 410 | return AE_SUPPORT; |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 411 | } |
| 412 | |
Bjorn Helgaas | b938a22 | 2013-09-05 15:05:54 -0600 | [diff] [blame] | 413 | capbuf[OSC_QUERY_DWORD] = 0; |
| 414 | capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set; |
| 415 | capbuf[OSC_CONTROL_DWORD] = ctrl; |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 416 | if (is_cxl(root)) { |
| 417 | capbuf[OSC_EXT_SUPPORT_DWORD] = root->osc_ext_support_set; |
| 418 | capbuf[OSC_EXT_CONTROL_DWORD] = cxl_ctrl; |
| 419 | } |
| 420 | |
| 421 | status = acpi_pci_run_osc(root, capbuf, mask, cxl_mask); |
Bjorn Helgaas | 866e61f | 2020-06-02 17:27:33 -0500 | [diff] [blame] | 422 | if (ACPI_FAILURE(status)) |
| 423 | return status; |
| 424 | |
| 425 | root->osc_control_set = *mask; |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 426 | root->osc_ext_control_set = *cxl_mask; |
Bjorn Helgaas | 866e61f | 2020-06-02 17:27:33 -0500 | [diff] [blame] | 427 | return AE_OK; |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 428 | } |
Kenji Kaneshige | 63f10f0 | 2009-02-09 15:59:29 +0900 | [diff] [blame] | 429 | |
Joerg Roedel | 4c6f606 | 2021-08-24 14:20:52 +0200 | [diff] [blame] | 430 | static u32 calculate_support(void) |
| 431 | { |
| 432 | u32 support; |
| 433 | |
| 434 | /* |
| 435 | * All supported architectures that use ACPI have support for |
| 436 | * PCI domains, so we indicate this in _OSC support capabilities. |
| 437 | */ |
| 438 | support = OSC_PCI_SEGMENT_GROUPS_SUPPORT; |
| 439 | support |= OSC_PCI_HPX_TYPE_3_SUPPORT; |
| 440 | if (pci_ext_cfg_avail()) |
| 441 | support |= OSC_PCI_EXT_CONFIG_SUPPORT; |
| 442 | if (pcie_aspm_support_enabled()) |
| 443 | support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT; |
| 444 | if (pci_msi_enabled()) |
| 445 | support |= OSC_PCI_MSI_SUPPORT; |
| 446 | if (IS_ENABLED(CONFIG_PCIE_EDR)) |
| 447 | support |= OSC_PCI_EDR_SUPPORT; |
| 448 | |
| 449 | return support; |
| 450 | } |
| 451 | |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 452 | /* |
| 453 | * Background on hotplug support, and making it depend on only |
| 454 | * CONFIG_HOTPLUG_PCI_PCIE vs. also considering CONFIG_MEMORY_HOTPLUG: |
| 455 | * |
| 456 | * CONFIG_ACPI_HOTPLUG_MEMORY does depend on CONFIG_MEMORY_HOTPLUG, but |
| 457 | * there is no existing _OSC for memory hotplug support. The reason is that |
| 458 | * ACPI memory hotplug requires the OS to acknowledge / coordinate with |
| 459 | * memory plug events via a scan handler. On the CXL side the equivalent |
| 460 | * would be if Linux supported the Mechanical Retention Lock [1], or |
| 461 | * otherwise had some coordination for the driver of a PCI device |
| 462 | * undergoing hotplug to be consulted on whether the hotplug should |
| 463 | * proceed or not. |
| 464 | * |
| 465 | * The concern is that if Linux says no to supporting CXL hotplug then |
| 466 | * the BIOS may say no to giving the OS hotplug control of any other PCIe |
| 467 | * device. So the question here is not whether hotplug is enabled, it's |
| 468 | * whether it is handled natively by the at all OS, and if |
| 469 | * CONFIG_HOTPLUG_PCI_PCIE is enabled then the answer is "yes". |
| 470 | * |
| 471 | * Otherwise, the plan for CXL coordinated remove, since the kernel does |
| 472 | * not support blocking hotplug, is to require the memory device to be |
| 473 | * disabled before hotplug is attempted. When CONFIG_MEMORY_HOTPLUG is |
| 474 | * disabled that step will fail and the remove attempt cancelled by the |
| 475 | * user. If that is not honored and the card is removed anyway then it |
| 476 | * does not matter if CONFIG_MEMORY_HOTPLUG is enabled or not, it will |
| 477 | * cause a crash and other badness. |
| 478 | * |
| 479 | * Therefore, just say yes to CXL hotplug and require removal to |
| 480 | * be coordinated by userspace unless and until the kernel grows better |
| 481 | * mechanisms for doing "managed" removal of devices in consultation with |
| 482 | * the driver. |
| 483 | * |
| 484 | * [1]: https://lore.kernel.org/all/20201122014203.4706-1-ashok.raj@intel.com/ |
| 485 | */ |
| 486 | static u32 calculate_cxl_support(void) |
| 487 | { |
| 488 | u32 support; |
| 489 | |
| 490 | support = OSC_CXL_2_0_PORT_DEV_REG_ACCESS_SUPPORT; |
Terry Bowman | da8380b | 2022-12-01 13:34:27 -0800 | [diff] [blame] | 491 | support |= OSC_CXL_1_1_PORT_REG_ACCESS_SUPPORT; |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 492 | if (pci_aer_available()) |
| 493 | support |= OSC_CXL_PROTOCOL_ERR_REPORTING_SUPPORT; |
| 494 | if (IS_ENABLED(CONFIG_HOTPLUG_PCI_PCIE)) |
| 495 | support |= OSC_CXL_NATIVE_HP_SUPPORT; |
| 496 | |
| 497 | return support; |
| 498 | } |
| 499 | |
Joerg Roedel | 4c6f606 | 2021-08-24 14:20:52 +0200 | [diff] [blame] | 500 | static u32 calculate_control(void) |
| 501 | { |
| 502 | u32 control; |
| 503 | |
| 504 | control = OSC_PCI_EXPRESS_CAPABILITY_CONTROL |
| 505 | | OSC_PCI_EXPRESS_PME_CONTROL; |
| 506 | |
| 507 | if (IS_ENABLED(CONFIG_PCIEASPM)) |
| 508 | control |= OSC_PCI_EXPRESS_LTR_CONTROL; |
| 509 | |
| 510 | if (IS_ENABLED(CONFIG_HOTPLUG_PCI_PCIE)) |
| 511 | control |= OSC_PCI_EXPRESS_NATIVE_HP_CONTROL; |
| 512 | |
| 513 | if (IS_ENABLED(CONFIG_HOTPLUG_PCI_SHPC)) |
| 514 | control |= OSC_PCI_SHPC_NATIVE_HP_CONTROL; |
| 515 | |
| 516 | if (pci_aer_available()) |
| 517 | control |= OSC_PCI_EXPRESS_AER_CONTROL; |
| 518 | |
| 519 | /* |
| 520 | * Per the Downstream Port Containment Related Enhancements ECN to |
| 521 | * the PCI Firmware Spec, r3.2, sec 4.5.1, table 4-5, |
| 522 | * OSC_PCI_EXPRESS_DPC_CONTROL indicates the OS supports both DPC |
| 523 | * and EDR. |
| 524 | */ |
| 525 | if (IS_ENABLED(CONFIG_PCIE_DPC) && IS_ENABLED(CONFIG_PCIE_EDR)) |
| 526 | control |= OSC_PCI_EXPRESS_DPC_CONTROL; |
| 527 | |
| 528 | return control; |
| 529 | } |
| 530 | |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 531 | static u32 calculate_cxl_control(void) |
| 532 | { |
| 533 | u32 control = 0; |
| 534 | |
| 535 | if (IS_ENABLED(CONFIG_MEMORY_FAILURE)) |
| 536 | control |= OSC_CXL_ERROR_REPORTING_CONTROL; |
| 537 | |
| 538 | return control; |
| 539 | } |
| 540 | |
Joerg Roedel | 87f1f87 | 2021-08-24 14:20:53 +0200 | [diff] [blame] | 541 | static bool os_control_query_checks(struct acpi_pci_root *root, u32 support) |
| 542 | { |
| 543 | struct acpi_device *device = root->device; |
| 544 | |
| 545 | if (pcie_ports_disabled) { |
| 546 | dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n"); |
| 547 | return false; |
| 548 | } |
| 549 | |
| 550 | if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) { |
| 551 | decode_osc_support(root, "not requesting OS control; OS requires", |
| 552 | ACPI_PCIE_REQ_SUPPORT); |
| 553 | return false; |
| 554 | } |
| 555 | |
| 556 | return true; |
| 557 | } |
| 558 | |
Dan Williams | 241d26b | 2022-04-13 01:36:17 -0600 | [diff] [blame] | 559 | static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm) |
Bjorn Helgaas | 3e43abb | 2013-09-05 15:07:41 -0600 | [diff] [blame] | 560 | { |
Joerg Roedel | 6bc779e | 2021-08-24 14:20:54 +0200 | [diff] [blame] | 561 | u32 support, control = 0, requested = 0; |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 562 | u32 cxl_support = 0, cxl_control = 0, cxl_requested = 0; |
Bjorn Helgaas | 3e43abb | 2013-09-05 15:07:41 -0600 | [diff] [blame] | 563 | acpi_status status; |
| 564 | struct acpi_device *device = root->device; |
| 565 | acpi_handle handle = device->handle; |
| 566 | |
| 567 | /* |
Matthew Garrett | 7bc5a2b | 2014-09-20 13:19:47 +0200 | [diff] [blame] | 568 | * Apple always return failure on _OSC calls when _OSI("Darwin") has |
| 569 | * been called successfully. We know the feature set supported by the |
| 570 | * platform, so avoid calling _OSC at all |
| 571 | */ |
Lukas Wunner | 630b3af | 2017-08-01 14:10:41 +0200 | [diff] [blame] | 572 | if (x86_apple_machine) { |
Matthew Garrett | 7bc5a2b | 2014-09-20 13:19:47 +0200 | [diff] [blame] | 573 | root->osc_control_set = ~OSC_PCI_EXPRESS_PME_CONTROL; |
| 574 | decode_osc_control(root, "OS assumes control of", |
| 575 | root->osc_control_set); |
| 576 | return; |
| 577 | } |
| 578 | |
Joerg Roedel | 4c6f606 | 2021-08-24 14:20:52 +0200 | [diff] [blame] | 579 | support = calculate_support(); |
Bjorn Helgaas | 955f14b | 2013-09-05 15:07:45 -0600 | [diff] [blame] | 580 | |
| 581 | decode_osc_support(root, "OS supports", support); |
Sinan Kaya | c238252 | 2018-08-10 04:32:12 +0000 | [diff] [blame] | 582 | |
Joerg Roedel | 6bc779e | 2021-08-24 14:20:54 +0200 | [diff] [blame] | 583 | if (os_control_query_checks(root, support)) |
| 584 | requested = control = calculate_control(); |
Sinan Kaya | c238252 | 2018-08-10 04:32:12 +0000 | [diff] [blame] | 585 | |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 586 | if (is_cxl(root)) { |
| 587 | cxl_support = calculate_cxl_support(); |
| 588 | decode_cxl_osc_support(root, "OS supports", cxl_support); |
| 589 | cxl_requested = cxl_control = calculate_cxl_control(); |
| 590 | } |
| 591 | |
| 592 | status = acpi_pci_osc_control_set(handle, &control, support, |
| 593 | &cxl_control, cxl_support); |
Bjorn Helgaas | de18966 | 2013-09-05 15:50:52 -0600 | [diff] [blame] | 594 | if (ACPI_SUCCESS(status)) { |
Joerg Roedel | 6bc779e | 2021-08-24 14:20:54 +0200 | [diff] [blame] | 595 | if (control) |
| 596 | decode_osc_control(root, "OS now controls", control); |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 597 | if (cxl_control) |
| 598 | decode_cxl_osc_control(root, "OS now controls", |
| 599 | cxl_control); |
Joerg Roedel | 6bc779e | 2021-08-24 14:20:54 +0200 | [diff] [blame] | 600 | |
Bjorn Helgaas | de18966 | 2013-09-05 15:50:52 -0600 | [diff] [blame] | 601 | if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { |
Bjorn Helgaas | 3e43abb | 2013-09-05 15:07:41 -0600 | [diff] [blame] | 602 | /* |
Matthew Garrett | 387d375 | 2015-04-07 11:07:00 -0700 | [diff] [blame] | 603 | * We have ASPM control, but the FADT indicates that |
| 604 | * it's unsupported. Leave existing configuration |
| 605 | * intact and prevent the OS from touching it. |
Bjorn Helgaas | 3e43abb | 2013-09-05 15:07:41 -0600 | [diff] [blame] | 606 | */ |
Matthew Garrett | 387d375 | 2015-04-07 11:07:00 -0700 | [diff] [blame] | 607 | dev_info(&device->dev, "FADT indicates ASPM is unsupported, using BIOS configuration\n"); |
| 608 | *no_aspm = 1; |
Bjorn Helgaas | 3e43abb | 2013-09-05 15:07:41 -0600 | [diff] [blame] | 609 | } |
| 610 | } else { |
Bjorn Helgaas | de18966 | 2013-09-05 15:50:52 -0600 | [diff] [blame] | 611 | /* |
| 612 | * We want to disable ASPM here, but aspm_disabled |
| 613 | * needs to remain in its state from boot so that we |
| 614 | * properly handle PCIe 1.1 devices. So we set this |
| 615 | * flag here, to defer the action until after the ACPI |
| 616 | * root scan. |
| 617 | */ |
| 618 | *no_aspm = 1; |
Joerg Roedel | 6bc779e | 2021-08-24 14:20:54 +0200 | [diff] [blame] | 619 | |
| 620 | /* _OSC is optional for PCI host bridges */ |
Dan Williams | 241d26b | 2022-04-13 01:36:17 -0600 | [diff] [blame] | 621 | if (status == AE_NOT_FOUND && !is_pcie(root)) |
Joerg Roedel | 6bc779e | 2021-08-24 14:20:54 +0200 | [diff] [blame] | 622 | return; |
| 623 | |
| 624 | if (control) { |
| 625 | decode_osc_control(root, "OS requested", requested); |
| 626 | decode_osc_control(root, "platform willing to grant", control); |
| 627 | } |
Vishal Verma | 5636802 | 2022-04-13 01:36:18 -0600 | [diff] [blame] | 628 | if (cxl_control) { |
| 629 | decode_cxl_osc_control(root, "OS requested", cxl_requested); |
| 630 | decode_cxl_osc_control(root, "platform willing to grant", |
| 631 | cxl_control); |
| 632 | } |
Joerg Roedel | 6bc779e | 2021-08-24 14:20:54 +0200 | [diff] [blame] | 633 | |
| 634 | dev_info(&device->dev, "_OSC: platform retains control of PCIe features (%s)\n", |
| 635 | acpi_format_exception(status)); |
Bjorn Helgaas | 3e43abb | 2013-09-05 15:07:41 -0600 | [diff] [blame] | 636 | } |
| 637 | } |
| 638 | |
Rafael J. Wysocki | 00c43b9 | 2013-01-30 14:27:33 +0100 | [diff] [blame] | 639 | static int acpi_pci_root_add(struct acpi_device *device, |
| 640 | const struct acpi_device_id *not_used) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | { |
Bjorn Helgaas | f5eebbe | 2009-06-18 14:46:52 -0600 | [diff] [blame] | 642 | unsigned long long segment, bus; |
| 643 | acpi_status status; |
| 644 | int result; |
| 645 | struct acpi_pci_root *root; |
Jiang Liu | bfe2414 | 2013-05-28 18:31:27 -0600 | [diff] [blame] | 646 | acpi_handle handle = device->handle; |
Matthew Garrett | 387d375 | 2015-04-07 11:07:00 -0700 | [diff] [blame] | 647 | int no_aspm = 0; |
Thomas Gleixner | 9762b33 | 2017-05-16 20:42:38 +0200 | [diff] [blame] | 648 | bool hotadd = system_state == SYSTEM_RUNNING; |
Dan Williams | 241d26b | 2022-04-13 01:36:17 -0600 | [diff] [blame] | 649 | const char *acpi_hid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | |
Bjorn Helgaas | 6ad9551 | 2010-03-11 12:20:06 -0700 | [diff] [blame] | 651 | root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); |
| 652 | if (!root) |
| 653 | return -ENOMEM; |
| 654 | |
Bjorn Helgaas | f5eebbe | 2009-06-18 14:46:52 -0600 | [diff] [blame] | 655 | segment = 0; |
Jiang Liu | bfe2414 | 2013-05-28 18:31:27 -0600 | [diff] [blame] | 656 | status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, |
Bjorn Helgaas | f5eebbe | 2009-06-18 14:46:52 -0600 | [diff] [blame] | 657 | &segment); |
| 658 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { |
Jiang Liu | 6dc7d22 | 2013-05-28 18:10:05 -0600 | [diff] [blame] | 659 | dev_err(&device->dev, "can't evaluate _SEG\n"); |
Bjorn Helgaas | 6ad9551 | 2010-03-11 12:20:06 -0700 | [diff] [blame] | 660 | result = -ENODEV; |
| 661 | goto end; |
Bjorn Helgaas | f5eebbe | 2009-06-18 14:46:52 -0600 | [diff] [blame] | 662 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | |
Bjorn Helgaas | f5eebbe | 2009-06-18 14:46:52 -0600 | [diff] [blame] | 664 | /* Check _CRS first, then _BBN. If no _BBN, default to zero. */ |
Bjorn Helgaas | 6ad9551 | 2010-03-11 12:20:06 -0700 | [diff] [blame] | 665 | root->secondary.flags = IORESOURCE_BUS; |
Jiang Liu | bfe2414 | 2013-05-28 18:31:27 -0600 | [diff] [blame] | 666 | status = try_get_root_bridge_busnr(handle, &root->secondary); |
Bjorn Helgaas | f5eebbe | 2009-06-18 14:46:52 -0600 | [diff] [blame] | 667 | if (ACPI_FAILURE(status)) { |
Bjorn Helgaas | 6ad9551 | 2010-03-11 12:20:06 -0700 | [diff] [blame] | 668 | /* |
| 669 | * We need both the start and end of the downstream bus range |
| 670 | * to interpret _CBA (MMCONFIG base address), so it really is |
| 671 | * supposed to be in _CRS. If we don't find it there, all we |
| 672 | * can do is assume [_BBN-0xFF] or [0-0xFF]. |
| 673 | */ |
| 674 | root->secondary.end = 0xFF; |
Jiang Liu | 6dc7d22 | 2013-05-28 18:10:05 -0600 | [diff] [blame] | 675 | dev_warn(&device->dev, |
| 676 | FW_BUG "no secondary bus range in _CRS\n"); |
Jiang Liu | bfe2414 | 2013-05-28 18:31:27 -0600 | [diff] [blame] | 677 | status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, |
Jon Mason | e545b55 | 2011-06-19 18:51:37 -0500 | [diff] [blame] | 678 | NULL, &bus); |
Bjorn Helgaas | 6ad9551 | 2010-03-11 12:20:06 -0700 | [diff] [blame] | 679 | if (ACPI_SUCCESS(status)) |
| 680 | root->secondary.start = bus; |
| 681 | else if (status == AE_NOT_FOUND) |
| 682 | root->secondary.start = 0; |
| 683 | else { |
Jiang Liu | 6dc7d22 | 2013-05-28 18:10:05 -0600 | [diff] [blame] | 684 | dev_err(&device->dev, "can't evaluate _BBN\n"); |
Bjorn Helgaas | 6ad9551 | 2010-03-11 12:20:06 -0700 | [diff] [blame] | 685 | result = -ENODEV; |
| 686 | goto end; |
Bjorn Helgaas | f5eebbe | 2009-06-18 14:46:52 -0600 | [diff] [blame] | 687 | } |
| 688 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | |
Patrick Mochel | 32917e5 | 2006-05-19 16:54:39 -0400 | [diff] [blame] | 690 | root->device = device; |
Bjorn Helgaas | 0705495 | 2009-06-18 14:47:07 -0600 | [diff] [blame] | 691 | root->segment = segment & 0xFFFF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); |
| 693 | strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); |
Pavel Machek | db89b4f | 2008-09-22 14:37:34 -0700 | [diff] [blame] | 694 | device->driver_data = root; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | |
Jiang Liu | 864b94a | 2014-11-09 22:48:03 +0800 | [diff] [blame] | 696 | if (hotadd && dmar_device_add(handle)) { |
| 697 | result = -ENXIO; |
| 698 | goto end; |
| 699 | } |
| 700 | |
Hanjun Guo | ccde83e | 2021-06-02 16:54:30 +0800 | [diff] [blame] | 701 | pr_info("%s [%s] (domain %04x %pR)\n", |
Bjorn Helgaas | d4761ba | 2012-10-30 15:24:50 +0900 | [diff] [blame] | 702 | acpi_device_name(device), acpi_device_bid(device), |
| 703 | root->segment, &root->secondary); |
| 704 | |
Jiang Liu | bfe2414 | 2013-05-28 18:31:27 -0600 | [diff] [blame] | 705 | root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle); |
Jiang Liu | f4b57a3 | 2012-06-22 14:55:16 +0800 | [diff] [blame] | 706 | |
Dan Williams | 241d26b | 2022-04-13 01:36:17 -0600 | [diff] [blame] | 707 | acpi_hid = acpi_device_hid(root->device); |
| 708 | if (strcmp(acpi_hid, "PNP0A08") == 0) |
| 709 | root->bridge_type = ACPI_BRIDGE_TYPE_PCIE; |
| 710 | else if (strcmp(acpi_hid, "ACPI0016") == 0) |
| 711 | root->bridge_type = ACPI_BRIDGE_TYPE_CXL; |
| 712 | else |
| 713 | dev_dbg(&device->dev, "Assuming non-PCIe host bridge\n"); |
| 714 | |
| 715 | negotiate_os_control(root, &no_aspm); |
Rafael J. Wysocki | 415e12b | 2011-01-07 00:55:09 +0100 | [diff] [blame] | 716 | |
Neil Horman | 3dc48af | 2013-08-29 16:17:05 -0400 | [diff] [blame] | 717 | /* |
| 718 | * TBD: Need PCI interface for enumeration/configuration of roots. |
| 719 | */ |
| 720 | |
| 721 | /* |
| 722 | * Scan the Root Bridge |
| 723 | * -------------------- |
| 724 | * Must do this prior to any attempt to bind the root device, as the |
| 725 | * PCI namespace does not get created until this call is made (and |
| 726 | * thus the root bridge's pci_dev does not exist). |
| 727 | */ |
| 728 | root->bus = pci_acpi_scan_root(root); |
| 729 | if (!root->bus) { |
| 730 | dev_err(&device->dev, |
| 731 | "Bus %04x:%02x not present in PCI namespace\n", |
| 732 | root->segment, (unsigned int)root->secondary.start); |
Rafael J. Wysocki | f516bde | 2013-11-14 00:54:17 +0100 | [diff] [blame] | 733 | device->driver_data = NULL; |
Neil Horman | 3dc48af | 2013-08-29 16:17:05 -0400 | [diff] [blame] | 734 | result = -ENODEV; |
Jiang Liu | 864b94a | 2014-11-09 22:48:03 +0800 | [diff] [blame] | 735 | goto remove_dmar; |
Neil Horman | 3dc48af | 2013-08-29 16:17:05 -0400 | [diff] [blame] | 736 | } |
| 737 | |
Neil Horman | 3dc48af | 2013-08-29 16:17:05 -0400 | [diff] [blame] | 738 | if (no_aspm) |
| 739 | pcie_no_aspm(); |
| 740 | |
Rafael J. Wysocki | c072530 | 2014-07-23 01:00:45 +0200 | [diff] [blame] | 741 | pci_acpi_add_bus_pm_notifier(device); |
Rafael J. Wysocki | de3ef1e | 2017-06-24 01:58:53 +0200 | [diff] [blame] | 742 | device_set_wakeup_capable(root->bus->bridge, device->wakeup.flags.valid); |
Rafael J. Wysocki | b67ea76 | 2010-02-17 23:44:09 +0100 | [diff] [blame] | 743 | |
Jiang Liu | 864b94a | 2014-11-09 22:48:03 +0800 | [diff] [blame] | 744 | if (hotadd) { |
Yinghai Lu | 3c449ed | 2012-11-03 21:39:31 -0700 | [diff] [blame] | 745 | pcibios_resource_survey_bus(root->bus); |
Yinghai Lu | 3977203 | 2013-07-22 14:37:18 -0700 | [diff] [blame] | 746 | pci_assign_unassigned_root_bus_resources(root->bus); |
Rui Wang | 584c5c4 | 2016-08-17 16:00:34 +0800 | [diff] [blame] | 747 | /* |
| 748 | * This is only called for the hotadd case. For the boot-time |
| 749 | * case, we need to wait until after PCI initialization in |
| 750 | * order to deal with IOAPICs mapped in on a PCI BAR. |
| 751 | * |
| 752 | * This is currently x86-specific, because acpi_ioapic_add() |
| 753 | * is an empty function without CONFIG_ACPI_HOTPLUG_IOAPIC. |
| 754 | * And CONFIG_ACPI_HOTPLUG_IOAPIC depends on CONFIG_X86_IO_APIC |
| 755 | * (see drivers/acpi/Kconfig). |
| 756 | */ |
Rui Wang | fe7bd58 | 2016-08-17 16:00:33 +0800 | [diff] [blame] | 757 | acpi_ioapic_add(root->device->handle); |
Jiang Liu | 516ca22 | 2013-05-28 18:04:46 -0600 | [diff] [blame] | 758 | } |
Yinghai Lu | 62a08c5 | 2012-10-30 14:31:32 -0600 | [diff] [blame] | 759 | |
Rafael J. Wysocki | 7a3bb55 | 2014-01-10 15:23:14 +0100 | [diff] [blame] | 760 | pci_lock_rescan_remove(); |
Bjorn Helgaas | caf420c | 2009-06-18 14:46:57 -0600 | [diff] [blame] | 761 | pci_bus_add_devices(root->bus); |
Rafael J. Wysocki | 7a3bb55 | 2014-01-10 15:23:14 +0100 | [diff] [blame] | 762 | pci_unlock_rescan_remove(); |
Rafael J. Wysocki | 00c43b9 | 2013-01-30 14:27:33 +0100 | [diff] [blame] | 763 | return 1; |
Rafael J. Wysocki | 47525cd | 2012-12-21 00:36:45 +0100 | [diff] [blame] | 764 | |
Jiang Liu | 864b94a | 2014-11-09 22:48:03 +0800 | [diff] [blame] | 765 | remove_dmar: |
| 766 | if (hotadd) |
| 767 | dmar_device_remove(handle); |
Rafael J. Wysocki | 47525cd | 2012-12-21 00:36:45 +0100 | [diff] [blame] | 768 | end: |
| 769 | kfree(root); |
| 770 | return result; |
Rajesh Shah | c431ada | 2005-04-28 00:25:45 -0700 | [diff] [blame] | 771 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | |
Rafael J. Wysocki | 00c43b9 | 2013-01-30 14:27:33 +0100 | [diff] [blame] | 773 | static void acpi_pci_root_remove(struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | { |
Bjorn Helgaas | caf420c | 2009-06-18 14:46:57 -0600 | [diff] [blame] | 775 | struct acpi_pci_root *root = acpi_driver_data(device); |
Jiang Liu | c8e9afb | 2012-09-18 15:20:34 +0900 | [diff] [blame] | 776 | |
Rafael J. Wysocki | 7a3bb55 | 2014-01-10 15:23:14 +0100 | [diff] [blame] | 777 | pci_lock_rescan_remove(); |
| 778 | |
Yinghai Lu | 9738a1f | 2012-10-30 14:31:43 -0600 | [diff] [blame] | 779 | pci_stop_root_bus(root->bus); |
| 780 | |
Rui Wang | f2ae5da | 2017-02-28 21:34:29 +0800 | [diff] [blame] | 781 | pci_ioapic_remove(root); |
Rafael J. Wysocki | de3ef1e | 2017-06-24 01:58:53 +0200 | [diff] [blame] | 782 | device_set_wakeup_capable(root->bus->bridge, false); |
Rafael J. Wysocki | b67ea76 | 2010-02-17 23:44:09 +0100 | [diff] [blame] | 783 | pci_acpi_remove_bus_pm_notifier(device); |
| 784 | |
Yinghai Lu | 9738a1f | 2012-10-30 14:31:43 -0600 | [diff] [blame] | 785 | pci_remove_root_bus(root->bus); |
Rui Wang | f2ae5da | 2017-02-28 21:34:29 +0800 | [diff] [blame] | 786 | WARN_ON(acpi_ioapic_remove(root)); |
Yinghai Lu | 9738a1f | 2012-10-30 14:31:43 -0600 | [diff] [blame] | 787 | |
Jiang Liu | 864b94a | 2014-11-09 22:48:03 +0800 | [diff] [blame] | 788 | dmar_device_remove(device->handle); |
| 789 | |
Rafael J. Wysocki | 7a3bb55 | 2014-01-10 15:23:14 +0100 | [diff] [blame] | 790 | pci_unlock_rescan_remove(); |
| 791 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | kfree(root); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | } |
| 794 | |
Jiang Liu | 2c20438 | 2015-10-14 14:29:39 +0800 | [diff] [blame] | 795 | /* |
| 796 | * Following code to support acpi_pci_root_create() is copied from |
| 797 | * arch/x86/pci/acpi.c and modified so it could be reused by x86, IA64 |
| 798 | * and ARM64. |
| 799 | */ |
| 800 | static void acpi_pci_root_validate_resources(struct device *dev, |
| 801 | struct list_head *resources, |
| 802 | unsigned long type) |
| 803 | { |
| 804 | LIST_HEAD(list); |
| 805 | struct resource *res1, *res2, *root = NULL; |
| 806 | struct resource_entry *tmp, *entry, *entry2; |
| 807 | |
| 808 | BUG_ON((type & (IORESOURCE_MEM | IORESOURCE_IO)) == 0); |
| 809 | root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource; |
| 810 | |
| 811 | list_splice_init(resources, &list); |
| 812 | resource_list_for_each_entry_safe(entry, tmp, &list) { |
| 813 | bool free = false; |
| 814 | resource_size_t end; |
| 815 | |
| 816 | res1 = entry->res; |
| 817 | if (!(res1->flags & type)) |
| 818 | goto next; |
| 819 | |
| 820 | /* Exclude non-addressable range or non-addressable portion */ |
| 821 | end = min(res1->end, root->end); |
| 822 | if (end <= res1->start) { |
| 823 | dev_info(dev, "host bridge window %pR (ignored, not CPU addressable)\n", |
| 824 | res1); |
| 825 | free = true; |
| 826 | goto next; |
| 827 | } else if (res1->end != end) { |
| 828 | dev_info(dev, "host bridge window %pR ([%#llx-%#llx] ignored, not CPU addressable)\n", |
| 829 | res1, (unsigned long long)end + 1, |
| 830 | (unsigned long long)res1->end); |
| 831 | res1->end = end; |
| 832 | } |
| 833 | |
| 834 | resource_list_for_each_entry(entry2, resources) { |
| 835 | res2 = entry2->res; |
| 836 | if (!(res2->flags & type)) |
| 837 | continue; |
| 838 | |
| 839 | /* |
| 840 | * I don't like throwing away windows because then |
| 841 | * our resources no longer match the ACPI _CRS, but |
| 842 | * the kernel resource tree doesn't allow overlaps. |
| 843 | */ |
Andy Shevchenko | 07aec68 | 2020-11-03 22:45:09 +0200 | [diff] [blame] | 844 | if (resource_union(res1, res2, res2)) { |
Jiang Liu | 2c20438 | 2015-10-14 14:29:39 +0800 | [diff] [blame] | 845 | dev_info(dev, "host bridge window expanded to %pR; %pR ignored\n", |
| 846 | res2, res1); |
| 847 | free = true; |
| 848 | goto next; |
| 849 | } |
| 850 | } |
| 851 | |
| 852 | next: |
| 853 | resource_list_del(entry); |
| 854 | if (free) |
| 855 | resource_list_free_entry(entry); |
| 856 | else |
| 857 | resource_list_add_tail(entry, resources); |
| 858 | } |
| 859 | } |
| 860 | |
Gabriele Paoloni | fcfaab3 | 2018-03-15 02:15:52 +0800 | [diff] [blame] | 861 | static void acpi_pci_root_remap_iospace(struct fwnode_handle *fwnode, |
| 862 | struct resource_entry *entry) |
Jayachandran C | 0a70abb | 2016-06-10 21:55:12 +0200 | [diff] [blame] | 863 | { |
| 864 | #ifdef PCI_IOBASE |
| 865 | struct resource *res = entry->res; |
| 866 | resource_size_t cpu_addr = res->start; |
| 867 | resource_size_t pci_addr = cpu_addr - entry->offset; |
| 868 | resource_size_t length = resource_size(res); |
| 869 | unsigned long port; |
| 870 | |
Gabriele Paoloni | fcfaab3 | 2018-03-15 02:15:52 +0800 | [diff] [blame] | 871 | if (pci_register_io_range(fwnode, cpu_addr, length)) |
Jayachandran C | 0a70abb | 2016-06-10 21:55:12 +0200 | [diff] [blame] | 872 | goto err; |
| 873 | |
| 874 | port = pci_address_to_pio(cpu_addr); |
| 875 | if (port == (unsigned long)-1) |
| 876 | goto err; |
| 877 | |
| 878 | res->start = port; |
| 879 | res->end = port + length - 1; |
| 880 | entry->offset = port - pci_addr; |
| 881 | |
| 882 | if (pci_remap_iospace(res, cpu_addr) < 0) |
| 883 | goto err; |
| 884 | |
| 885 | pr_info("Remapped I/O %pa to %pR\n", &cpu_addr, res); |
| 886 | return; |
| 887 | err: |
| 888 | res->flags |= IORESOURCE_DISABLED; |
| 889 | #endif |
| 890 | } |
| 891 | |
Jiang Liu | 2c20438 | 2015-10-14 14:29:39 +0800 | [diff] [blame] | 892 | int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info) |
| 893 | { |
| 894 | int ret; |
| 895 | struct list_head *list = &info->resources; |
| 896 | struct acpi_device *device = info->bridge; |
| 897 | struct resource_entry *entry, *tmp; |
| 898 | unsigned long flags; |
| 899 | |
| 900 | flags = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_MEM_8AND16BIT; |
| 901 | ret = acpi_dev_get_resources(device, list, |
| 902 | acpi_dev_filter_resource_type_cb, |
| 903 | (void *)flags); |
| 904 | if (ret < 0) |
| 905 | dev_warn(&device->dev, |
| 906 | "failed to parse _CRS method, error code %d\n", ret); |
| 907 | else if (ret == 0) |
| 908 | dev_dbg(&device->dev, |
| 909 | "no IO and memory resources present in _CRS\n"); |
| 910 | else { |
| 911 | resource_list_for_each_entry_safe(entry, tmp, list) { |
Jayachandran C | 0a70abb | 2016-06-10 21:55:12 +0200 | [diff] [blame] | 912 | if (entry->res->flags & IORESOURCE_IO) |
Gabriele Paoloni | fcfaab3 | 2018-03-15 02:15:52 +0800 | [diff] [blame] | 913 | acpi_pci_root_remap_iospace(&device->fwnode, |
| 914 | entry); |
Jayachandran C | 0a70abb | 2016-06-10 21:55:12 +0200 | [diff] [blame] | 915 | |
Jiang Liu | 2c20438 | 2015-10-14 14:29:39 +0800 | [diff] [blame] | 916 | if (entry->res->flags & IORESOURCE_DISABLED) |
| 917 | resource_list_destroy_entry(entry); |
| 918 | else |
| 919 | entry->res->name = info->name; |
| 920 | } |
| 921 | acpi_pci_root_validate_resources(&device->dev, list, |
| 922 | IORESOURCE_MEM); |
| 923 | acpi_pci_root_validate_resources(&device->dev, list, |
| 924 | IORESOURCE_IO); |
| 925 | } |
| 926 | |
| 927 | return ret; |
| 928 | } |
| 929 | |
| 930 | static void pci_acpi_root_add_resources(struct acpi_pci_root_info *info) |
| 931 | { |
| 932 | struct resource_entry *entry, *tmp; |
| 933 | struct resource *res, *conflict, *root = NULL; |
| 934 | |
| 935 | resource_list_for_each_entry_safe(entry, tmp, &info->resources) { |
| 936 | res = entry->res; |
| 937 | if (res->flags & IORESOURCE_MEM) |
| 938 | root = &iomem_resource; |
| 939 | else if (res->flags & IORESOURCE_IO) |
| 940 | root = &ioport_resource; |
| 941 | else |
| 942 | continue; |
| 943 | |
Liu Jiang | 727ae8b | 2015-11-27 11:12:33 +0800 | [diff] [blame] | 944 | /* |
| 945 | * Some legacy x86 host bridge drivers use iomem_resource and |
| 946 | * ioport_resource as default resource pool, skip it. |
| 947 | */ |
| 948 | if (res == root) |
| 949 | continue; |
| 950 | |
Jiang Liu | 2c20438 | 2015-10-14 14:29:39 +0800 | [diff] [blame] | 951 | conflict = insert_resource_conflict(root, res); |
| 952 | if (conflict) { |
| 953 | dev_info(&info->bridge->dev, |
| 954 | "ignoring host bridge window %pR (conflicts with %s %pR)\n", |
| 955 | res, conflict->name, conflict); |
| 956 | resource_list_destroy_entry(entry); |
| 957 | } |
| 958 | } |
| 959 | } |
| 960 | |
| 961 | static void __acpi_pci_root_release_info(struct acpi_pci_root_info *info) |
| 962 | { |
| 963 | struct resource *res; |
| 964 | struct resource_entry *entry, *tmp; |
| 965 | |
| 966 | if (!info) |
| 967 | return; |
| 968 | |
| 969 | resource_list_for_each_entry_safe(entry, tmp, &info->resources) { |
| 970 | res = entry->res; |
| 971 | if (res->parent && |
| 972 | (res->flags & (IORESOURCE_MEM | IORESOURCE_IO))) |
| 973 | release_resource(res); |
| 974 | resource_list_destroy_entry(entry); |
| 975 | } |
| 976 | |
| 977 | info->ops->release_info(info); |
| 978 | } |
| 979 | |
| 980 | static void acpi_pci_root_release_info(struct pci_host_bridge *bridge) |
| 981 | { |
| 982 | struct resource *res; |
| 983 | struct resource_entry *entry; |
| 984 | |
| 985 | resource_list_for_each_entry(entry, &bridge->windows) { |
| 986 | res = entry->res; |
Jayachandran C | 0a70abb | 2016-06-10 21:55:12 +0200 | [diff] [blame] | 987 | if (res->flags & IORESOURCE_IO) |
| 988 | pci_unmap_iospace(res); |
Jiang Liu | 2c20438 | 2015-10-14 14:29:39 +0800 | [diff] [blame] | 989 | if (res->parent && |
| 990 | (res->flags & (IORESOURCE_MEM | IORESOURCE_IO))) |
| 991 | release_resource(res); |
| 992 | } |
| 993 | __acpi_pci_root_release_info(bridge->release_data); |
| 994 | } |
| 995 | |
| 996 | struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, |
| 997 | struct acpi_pci_root_ops *ops, |
| 998 | struct acpi_pci_root_info *info, |
| 999 | void *sysdata) |
| 1000 | { |
| 1001 | int ret, busnum = root->secondary.start; |
| 1002 | struct acpi_device *device = root->device; |
| 1003 | int node = acpi_get_node(device->handle); |
| 1004 | struct pci_bus *bus; |
Bjorn Helgaas | 02bfeb4 | 2018-03-09 11:21:25 -0600 | [diff] [blame] | 1005 | struct pci_host_bridge *host_bridge; |
Jiang Liu | 2c20438 | 2015-10-14 14:29:39 +0800 | [diff] [blame] | 1006 | |
| 1007 | info->root = root; |
| 1008 | info->bridge = device; |
| 1009 | info->ops = ops; |
| 1010 | INIT_LIST_HEAD(&info->resources); |
| 1011 | snprintf(info->name, sizeof(info->name), "PCI Bus %04x:%02x", |
| 1012 | root->segment, busnum); |
| 1013 | |
| 1014 | if (ops->init_info && ops->init_info(info)) |
| 1015 | goto out_release_info; |
| 1016 | if (ops->prepare_resources) |
| 1017 | ret = ops->prepare_resources(info); |
| 1018 | else |
| 1019 | ret = acpi_pci_probe_root_resources(info); |
| 1020 | if (ret < 0) |
| 1021 | goto out_release_info; |
| 1022 | |
| 1023 | pci_acpi_root_add_resources(info); |
| 1024 | pci_add_resource(&info->resources, &root->secondary); |
| 1025 | bus = pci_create_root_bus(NULL, busnum, ops->pci_ops, |
| 1026 | sysdata, &info->resources); |
| 1027 | if (!bus) |
| 1028 | goto out_release_info; |
| 1029 | |
Bjorn Helgaas | 02bfeb4 | 2018-03-09 11:21:25 -0600 | [diff] [blame] | 1030 | host_bridge = to_pci_host_bridge(bus->bridge); |
| 1031 | if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)) |
Mika Westerberg | 9310f0d | 2018-05-23 17:22:19 -0500 | [diff] [blame] | 1032 | host_bridge->native_pcie_hotplug = 0; |
Mika Westerberg | 1df81a6 | 2018-05-23 17:40:23 -0500 | [diff] [blame] | 1033 | if (!(root->osc_control_set & OSC_PCI_SHPC_NATIVE_HP_CONTROL)) |
| 1034 | host_bridge->native_shpc_hotplug = 0; |
Bjorn Helgaas | 02bfeb4 | 2018-03-09 11:21:25 -0600 | [diff] [blame] | 1035 | if (!(root->osc_control_set & OSC_PCI_EXPRESS_AER_CONTROL)) |
| 1036 | host_bridge->native_aer = 0; |
| 1037 | if (!(root->osc_control_set & OSC_PCI_EXPRESS_PME_CONTROL)) |
| 1038 | host_bridge->native_pme = 0; |
Bjorn Helgaas | af8bb9f | 2018-04-17 10:58:09 -0500 | [diff] [blame] | 1039 | if (!(root->osc_control_set & OSC_PCI_EXPRESS_LTR_CONTROL)) |
| 1040 | host_bridge->native_ltr = 0; |
Kuppuswamy Sathyanarayanan | ac1c8e3 | 2020-03-23 17:26:07 -0700 | [diff] [blame] | 1041 | if (!(root->osc_control_set & OSC_PCI_EXPRESS_DPC_CONTROL)) |
| 1042 | host_bridge->native_dpc = 0; |
Bjorn Helgaas | 02bfeb4 | 2018-03-09 11:21:25 -0600 | [diff] [blame] | 1043 | |
Ira Weiny | 589c335 | 2022-12-11 23:06:19 -0800 | [diff] [blame] | 1044 | if (!(root->osc_ext_control_set & OSC_CXL_ERROR_REPORTING_CONTROL)) |
| 1045 | host_bridge->native_cxl_error = 0; |
| 1046 | |
Rafael J. Wysocki | 62d5287 | 2022-04-04 17:25:04 +0200 | [diff] [blame] | 1047 | acpi_dev_power_up_children_with_adr(device); |
| 1048 | |
Jiang Liu | 2c20438 | 2015-10-14 14:29:39 +0800 | [diff] [blame] | 1049 | pci_scan_child_bus(bus); |
Bjorn Helgaas | 02bfeb4 | 2018-03-09 11:21:25 -0600 | [diff] [blame] | 1050 | pci_set_host_bridge_release(host_bridge, acpi_pci_root_release_info, |
| 1051 | info); |
Jiang Liu | 2c20438 | 2015-10-14 14:29:39 +0800 | [diff] [blame] | 1052 | if (node != NUMA_NO_NODE) |
| 1053 | dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node); |
| 1054 | return bus; |
| 1055 | |
| 1056 | out_release_info: |
| 1057 | __acpi_pci_root_release_info(info); |
| 1058 | return NULL; |
| 1059 | } |
| 1060 | |
Rafael J. Wysocki | 00c43b9 | 2013-01-30 14:27:33 +0100 | [diff] [blame] | 1061 | void __init acpi_pci_root_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | { |
Rafael J. Wysocki | 3338db0 | 2013-11-22 21:55:20 +0100 | [diff] [blame] | 1063 | if (acpi_pci_disabled) |
Yinghai Lu | 668192b | 2013-01-21 13:20:48 -0800 | [diff] [blame] | 1064 | return; |
Yinghai Lu | 668192b | 2013-01-21 13:20:48 -0800 | [diff] [blame] | 1065 | |
Rafael J. Wysocki | 3338db0 | 2013-11-22 21:55:20 +0100 | [diff] [blame] | 1066 | pci_acpi_crs_quirks(); |
| 1067 | acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root"); |
Yinghai Lu | 668192b | 2013-01-21 13:20:48 -0800 | [diff] [blame] | 1068 | } |