blob: ae3fe4e642035b2d51b2e3f6c4d93e68a6cb1bcc [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $)
3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 *
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or (at
12 * your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
20 */
21
22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/init.h>
25#include <linux/types.h>
Taku Izumid0020f62012-09-18 15:21:31 +090026#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/pm.h>
Rafael J. Wysockib67ea762010-02-17 23:44:09 +010028#include <linux/pm_runtime.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/pci.h>
Andrew Patterson990a7ac2008-11-10 15:30:45 -070030#include <linux/pci-acpi.h>
Naga Chumbalkareca67312011-03-21 03:29:20 +000031#include <linux/pci-aspm.h>
Jiang Liu864b94a2014-11-09 22:48:03 +080032#include <linux/dmar.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <linux/acpi.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090034#include <linux/slab.h>
Matthew Garrett7bc5a2b2014-09-20 13:19:47 +020035#include <linux/dmi.h>
Lv Zheng8b484632013-12-03 08:49:16 +080036#include <acpi/apei.h> /* for acpi_hest_init() */
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
Rafael J. Wysockiace82382013-11-07 01:41:48 +010038#include "internal.h"
39
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#define _COMPONENT ACPI_PCI_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050041ACPI_MODULE_NAME("pci_root");
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#define ACPI_PCI_ROOT_CLASS "pci_bridge"
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge"
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +010044static int acpi_pci_root_add(struct acpi_device *device,
45 const struct acpi_device_id *not_used);
46static void acpi_pci_root_remove(struct acpi_device *device);
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
Rafael J. Wysocki3338db02013-11-22 21:55:20 +010048static int acpi_pci_root_scan_dependent(struct acpi_device *adev)
49{
Rafael J. Wysocki1f7c1642014-02-04 00:45:13 +010050 acpiphp_check_host_bridge(adev);
Rafael J. Wysocki3338db02013-11-22 21:55:20 +010051 return 0;
52}
53
Bjorn Helgaas7dab9ef2013-09-05 15:07:39 -060054#define ACPI_PCIE_REQ_SUPPORT (OSC_PCI_EXT_CONFIG_SUPPORT \
55 | OSC_PCI_ASPM_SUPPORT \
56 | OSC_PCI_CLOCK_PM_SUPPORT \
57 | OSC_PCI_MSI_SUPPORT)
Rafael J. Wysocki415e12b2011-01-07 00:55:09 +010058
Márton Némethc97adf92010-01-10 17:15:36 +010059static const struct acpi_device_id root_device_ids[] = {
Thomas Renninger1ba90e32007-07-23 14:44:41 +020060 {"PNP0A03", 0},
61 {"", 0},
62};
Thomas Renninger1ba90e32007-07-23 14:44:41 +020063
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +010064static struct acpi_scan_handler pci_root_handler = {
Thomas Renninger1ba90e32007-07-23 14:44:41 +020065 .ids = root_device_ids,
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +010066 .attach = acpi_pci_root_add,
67 .detach = acpi_pci_root_remove,
Toshi Kanica499fc2013-11-20 14:25:34 +010068 .hotplug = {
Rafael J. Wysocki3338db02013-11-22 21:55:20 +010069 .enabled = true,
70 .scan_dependent = acpi_pci_root_scan_dependent,
Toshi Kanica499fc2013-11-20 14:25:34 +010071 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070072};
73
Kenji Kaneshige63f10f02009-02-09 15:59:29 +090074static DEFINE_MUTEX(osc_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
Alexander Chiang27558202009-06-10 19:55:14 +000076/**
77 * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
78 * @handle - the ACPI CA node in question.
79 *
80 * Note: we could make this API take a struct acpi_device * instead, but
81 * for now, it's more convenient to operate on an acpi_handle.
82 */
83int acpi_is_root_bridge(acpi_handle handle)
84{
85 int ret;
86 struct acpi_device *device;
87
88 ret = acpi_bus_get_device(handle, &device);
89 if (ret)
90 return 0;
91
92 ret = acpi_match_device_ids(device, root_device_ids);
93 if (ret)
94 return 0;
95 else
96 return 1;
97}
98EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
99
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100static acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400101get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102{
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700103 struct resource *res = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 struct acpi_resource_address64 address;
Bjorn Helgaasf6c1c8f2012-06-21 23:48:50 -0600105 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106
Bjorn Helgaasf6c1c8f2012-06-21 23:48:50 -0600107 status = acpi_resource_to_address64(resource, &address);
108 if (ACPI_FAILURE(status))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 return AE_OK;
110
Lv Zhenga45de932015-01-26 16:58:56 +0800111 if ((address.address.address_length > 0) &&
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700112 (address.resource_type == ACPI_BUS_NUMBER_RANGE)) {
Lv Zhenga45de932015-01-26 16:58:56 +0800113 res->start = address.address.minimum;
114 res->end = address.address.minimum + address.address.address_length - 1;
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700115 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
117 return AE_OK;
118}
119
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600120static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700121 struct resource *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122{
123 acpi_status status;
124
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700125 res->start = -1;
Len Brown4be44fc2005-08-05 00:44:28 -0400126 status =
127 acpi_walk_resources(handle, METHOD_NAME__CRS,
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700128 get_root_bridge_busnr_callback, res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 if (ACPI_FAILURE(status))
130 return status;
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700131 if (res->start == -1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 return AE_ERROR;
133 return AE_OK;
134}
135
Bjorn Helgaas955f14b2013-09-05 15:07:45 -0600136struct pci_osc_bit_struct {
137 u32 bit;
138 char *desc;
139};
140
141static struct pci_osc_bit_struct pci_osc_support_bit[] = {
142 { OSC_PCI_EXT_CONFIG_SUPPORT, "ExtendedConfig" },
143 { OSC_PCI_ASPM_SUPPORT, "ASPM" },
144 { OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" },
145 { OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" },
146 { OSC_PCI_MSI_SUPPORT, "MSI" },
147};
148
149static struct pci_osc_bit_struct pci_osc_control_bit[] = {
150 { OSC_PCI_EXPRESS_NATIVE_HP_CONTROL, "PCIeHotplug" },
151 { OSC_PCI_SHPC_NATIVE_HP_CONTROL, "SHPCHotplug" },
152 { OSC_PCI_EXPRESS_PME_CONTROL, "PME" },
153 { OSC_PCI_EXPRESS_AER_CONTROL, "AER" },
154 { OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" },
155};
156
157static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word,
158 struct pci_osc_bit_struct *table, int size)
159{
160 char buf[80];
161 int i, len = 0;
162 struct pci_osc_bit_struct *entry;
163
164 buf[0] = '\0';
165 for (i = 0, entry = table; i < size; i++, entry++)
166 if (word & entry->bit)
167 len += snprintf(buf + len, sizeof(buf) - len, "%s%s",
168 len ? " " : "", entry->desc);
169
170 dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf);
171}
172
173static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word)
174{
175 decode_osc_bits(root, msg, word, pci_osc_support_bit,
176 ARRAY_SIZE(pci_osc_support_bit));
177}
178
179static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word)
180{
181 decode_osc_bits(root, msg, word, pci_osc_control_bit,
182 ARRAY_SIZE(pci_osc_control_bit));
183}
184
Shaohua Li3a9622d2009-10-29 11:04:50 +0800185static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766";
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900186
187static acpi_status acpi_pci_run_osc(acpi_handle handle,
188 const u32 *capbuf, u32 *retval)
189{
Shaohua Li3a9622d2009-10-29 11:04:50 +0800190 struct acpi_osc_context context = {
191 .uuid_str = pci_osc_uuid_str,
192 .rev = 1,
193 .cap.length = 12,
194 .cap.pointer = (void *)capbuf,
195 };
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900196 acpi_status status;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900197
Shaohua Li3a9622d2009-10-29 11:04:50 +0800198 status = acpi_run_osc(handle, &context);
199 if (ACPI_SUCCESS(status)) {
200 *retval = *((u32 *)(context.ret.pointer + 8));
201 kfree(context.ret.pointer);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900202 }
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900203 return status;
204}
205
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200206static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root,
207 u32 support,
208 u32 *control)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900209{
210 acpi_status status;
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200211 u32 result, capbuf[3];
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900212
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200213 support &= OSC_PCI_SUPPORT_MASKS;
214 support |= root->osc_support_set;
215
Bjorn Helgaasb938a222013-09-05 15:05:54 -0600216 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
217 capbuf[OSC_SUPPORT_DWORD] = support;
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200218 if (control) {
219 *control &= OSC_PCI_CONTROL_MASKS;
Bjorn Helgaasb938a222013-09-05 15:05:54 -0600220 capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set;
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200221 } else {
Yinghai Lu545d6e12013-03-28 04:28:58 +0000222 /* Run _OSC query only with existing controls. */
Bjorn Helgaasb938a222013-09-05 15:05:54 -0600223 capbuf[OSC_CONTROL_DWORD] = root->osc_control_set;
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200224 }
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900225
226 status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
227 if (ACPI_SUCCESS(status)) {
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200228 root->osc_support_set = support;
Rafael J. Wysocki2b8fd912010-08-23 23:55:59 +0200229 if (control)
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200230 *control = result;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900231 }
232 return status;
233}
234
235static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
236{
237 acpi_status status;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900238
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900239 mutex_lock(&osc_lock);
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200240 status = acpi_pci_query_osc(root, flags, NULL);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900241 mutex_unlock(&osc_lock);
242 return status;
243}
244
Alex Chiang76d56de2009-07-23 17:03:00 -0600245struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900246{
247 struct acpi_pci_root *root;
Taku Izumicd4faf92012-09-18 15:23:23 +0900248 struct acpi_device *device;
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600249
Taku Izumicd4faf92012-09-18 15:23:23 +0900250 if (acpi_bus_get_device(handle, &device) ||
251 acpi_match_device_ids(device, root_device_ids))
252 return NULL;
253
254 root = acpi_driver_data(device);
255
256 return root;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900257}
Alex Chiang76d56de2009-07-23 17:03:00 -0600258EXPORT_SYMBOL_GPL(acpi_pci_find_root);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900259
Alexander Chiang2f7bbce2009-06-10 19:55:20 +0000260struct acpi_handle_node {
261 struct list_head node;
262 acpi_handle handle;
263};
264
265/**
266 * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev
267 * @handle: the handle in question
268 *
269 * Given an ACPI CA handle, the desired PCI device is located in the
270 * list of PCI devices.
271 *
272 * If the device is found, its reference count is increased and this
273 * function returns a pointer to its data structure. The caller must
274 * decrement the reference count by calling pci_dev_put().
275 * If no device is found, %NULL is returned.
276 */
277struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
278{
279 int dev, fn;
280 unsigned long long adr;
281 acpi_status status;
282 acpi_handle phandle;
283 struct pci_bus *pbus;
284 struct pci_dev *pdev = NULL;
285 struct acpi_handle_node *node, *tmp;
286 struct acpi_pci_root *root;
287 LIST_HEAD(device_list);
288
289 /*
290 * Walk up the ACPI CA namespace until we reach a PCI root bridge.
291 */
292 phandle = handle;
293 while (!acpi_is_root_bridge(phandle)) {
294 node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL);
295 if (!node)
296 goto out;
297
298 INIT_LIST_HEAD(&node->node);
299 node->handle = phandle;
300 list_add(&node->node, &device_list);
301
302 status = acpi_get_parent(phandle, &phandle);
303 if (ACPI_FAILURE(status))
304 goto out;
305 }
306
307 root = acpi_pci_find_root(phandle);
308 if (!root)
309 goto out;
310
311 pbus = root->bus;
312
313 /*
314 * Now, walk back down the PCI device tree until we return to our
315 * original handle. Assumes that everything between the PCI root
316 * bridge and the device we're looking for must be a P2P bridge.
317 */
318 list_for_each_entry(node, &device_list, node) {
319 acpi_handle hnd = node->handle;
320 status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr);
321 if (ACPI_FAILURE(status))
322 goto out;
323 dev = (adr >> 16) & 0xffff;
324 fn = adr & 0xffff;
325
326 pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn));
Troy Moure412af972009-06-25 17:05:35 -0600327 if (!pdev || hnd == handle)
Alexander Chiang2f7bbce2009-06-10 19:55:20 +0000328 break;
329
330 pbus = pdev->subordinate;
331 pci_dev_put(pdev);
Rafael J. Wysocki497fb542009-10-13 01:01:57 +0200332
333 /*
334 * This function may be called for a non-PCI device that has a
335 * PCI parent (eg. a disk under a PCI SATA controller). In that
336 * case pdev->subordinate will be NULL for the parent.
337 */
338 if (!pbus) {
339 dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n");
340 pdev = NULL;
341 break;
342 }
Alexander Chiang2f7bbce2009-06-10 19:55:20 +0000343 }
344out:
345 list_for_each_entry_safe(node, tmp, &device_list, node)
346 kfree(node);
347
348 return pdev;
349}
350EXPORT_SYMBOL_GPL(acpi_get_pci_dev);
351
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900352/**
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200353 * acpi_pci_osc_control_set - Request control of PCI root _OSC features.
354 * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex).
355 * @mask: Mask of _OSC bits to request control of, place to store control mask.
356 * @req: Mask of _OSC bits the control of is essential to the caller.
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900357 *
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200358 * Run _OSC query for @mask and if that is successful, compare the returned
359 * mask of control bits with @req. If all of the @req bits are set in the
360 * returned mask, run _OSC request for it.
361 *
362 * The variable at the @mask address may be modified regardless of whether or
363 * not the function returns success. On success it will contain the mask of
364 * _OSC bits the BIOS has granted control of, but its contents are meaningless
365 * on failure.
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900366 **/
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200367acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900368{
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900369 struct acpi_pci_root *root;
Bjorn Helgaas4ffe6e52013-09-05 15:07:41 -0600370 acpi_status status = AE_OK;
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200371 u32 ctrl, capbuf[3];
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900372
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200373 if (!mask)
374 return AE_BAD_PARAMETER;
375
376 ctrl = *mask & OSC_PCI_CONTROL_MASKS;
377 if ((ctrl & req) != req)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900378 return AE_TYPE;
379
380 root = acpi_pci_find_root(handle);
381 if (!root)
382 return AE_NOT_EXIST;
383
384 mutex_lock(&osc_lock);
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200385
386 *mask = ctrl | root->osc_control_set;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900387 /* No need to evaluate _OSC if the control was already granted. */
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200388 if ((root->osc_control_set & ctrl) == ctrl)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900389 goto out;
390
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200391 /* Need to check the available controls bits before requesting them. */
392 while (*mask) {
393 status = acpi_pci_query_osc(root, root->osc_support_set, mask);
394 if (ACPI_FAILURE(status))
395 goto out;
396 if (ctrl == *mask)
397 break;
Bjorn Helgaas955f14b2013-09-05 15:07:45 -0600398 decode_osc_control(root, "platform does not support",
399 ctrl & ~(*mask));
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200400 ctrl = *mask;
401 }
Rafael J. Wysocki2b8fd912010-08-23 23:55:59 +0200402
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200403 if ((ctrl & req) != req) {
Bjorn Helgaas955f14b2013-09-05 15:07:45 -0600404 decode_osc_control(root, "not requesting control; platform does not support",
405 req & ~(ctrl));
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900406 status = AE_SUPPORT;
407 goto out;
408 }
409
Bjorn Helgaasb938a222013-09-05 15:05:54 -0600410 capbuf[OSC_QUERY_DWORD] = 0;
411 capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set;
412 capbuf[OSC_CONTROL_DWORD] = ctrl;
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200413 status = acpi_pci_run_osc(handle, capbuf, mask);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900414 if (ACPI_SUCCESS(status))
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200415 root->osc_control_set = *mask;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900416out:
417 mutex_unlock(&osc_lock);
418 return status;
419}
Kenji Kaneshige9f5404d2009-02-09 16:00:04 +0900420EXPORT_SYMBOL(acpi_pci_osc_control_set);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900421
Matthew Garrett387d3752015-04-07 11:07:00 -0700422static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm)
Bjorn Helgaas3e43abb2013-09-05 15:07:41 -0600423{
Bjorn Helgaas955f14b2013-09-05 15:07:45 -0600424 u32 support, control, requested;
Bjorn Helgaas3e43abb2013-09-05 15:07:41 -0600425 acpi_status status;
426 struct acpi_device *device = root->device;
427 acpi_handle handle = device->handle;
428
429 /*
Matthew Garrett7bc5a2b2014-09-20 13:19:47 +0200430 * Apple always return failure on _OSC calls when _OSI("Darwin") has
431 * been called successfully. We know the feature set supported by the
432 * platform, so avoid calling _OSC at all
433 */
434
435 if (dmi_match(DMI_SYS_VENDOR, "Apple Inc.")) {
436 root->osc_control_set = ~OSC_PCI_EXPRESS_PME_CONTROL;
437 decode_osc_control(root, "OS assumes control of",
438 root->osc_control_set);
439 return;
440 }
441
442 /*
Bjorn Helgaas3e43abb2013-09-05 15:07:41 -0600443 * All supported architectures that use ACPI have support for
444 * PCI domains, so we indicate this in _OSC support capabilities.
445 */
Bjorn Helgaas65afe912013-09-05 15:07:43 -0600446 support = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
Bjorn Helgaas3e43abb2013-09-05 15:07:41 -0600447 if (pci_ext_cfg_avail())
Bjorn Helgaasb8eb67f2013-09-05 15:07:42 -0600448 support |= OSC_PCI_EXT_CONFIG_SUPPORT;
Bjorn Helgaas1b2a7be2013-09-05 15:07:42 -0600449 if (pcie_aspm_support_enabled())
Bjorn Helgaasb8eb67f2013-09-05 15:07:42 -0600450 support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT;
Bjorn Helgaas3e43abb2013-09-05 15:07:41 -0600451 if (pci_msi_enabled())
Bjorn Helgaasb8eb67f2013-09-05 15:07:42 -0600452 support |= OSC_PCI_MSI_SUPPORT;
Bjorn Helgaas955f14b2013-09-05 15:07:45 -0600453
454 decode_osc_support(root, "OS supports", support);
Bjorn Helgaas1b2a7be2013-09-05 15:07:42 -0600455 status = acpi_pci_osc_support(root, support);
456 if (ACPI_FAILURE(status)) {
Bjorn Helgaas65afe912013-09-05 15:07:43 -0600457 dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n",
458 acpi_format_exception(status));
Bjorn Helgaas1b2a7be2013-09-05 15:07:42 -0600459 *no_aspm = 1;
Bjorn Helgaas65afe912013-09-05 15:07:43 -0600460 return;
Bjorn Helgaas3e43abb2013-09-05 15:07:41 -0600461 }
462
Bjorn Helgaas43613a12013-09-05 15:07:43 -0600463 if (pcie_ports_disabled) {
464 dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n");
465 return;
466 }
467
Bjorn Helgaasde189662013-09-05 15:50:52 -0600468 if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) {
Bjorn Helgaas955f14b2013-09-05 15:07:45 -0600469 decode_osc_support(root, "not requesting OS control; OS requires",
470 ACPI_PCIE_REQ_SUPPORT);
Bjorn Helgaasde189662013-09-05 15:50:52 -0600471 return;
472 }
Bjorn Helgaas3e43abb2013-09-05 15:07:41 -0600473
Bjorn Helgaasde189662013-09-05 15:50:52 -0600474 control = OSC_PCI_EXPRESS_CAPABILITY_CONTROL
475 | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL
476 | OSC_PCI_EXPRESS_PME_CONTROL;
Bjorn Helgaas3e43abb2013-09-05 15:07:41 -0600477
Bjorn Helgaasde189662013-09-05 15:50:52 -0600478 if (pci_aer_available()) {
479 if (aer_acpi_firmware_first())
Bjorn Helgaas955f14b2013-09-05 15:07:45 -0600480 dev_info(&device->dev,
481 "PCIe AER handled by firmware\n");
Bjorn Helgaasde189662013-09-05 15:50:52 -0600482 else
483 control |= OSC_PCI_EXPRESS_AER_CONTROL;
484 }
485
Bjorn Helgaas955f14b2013-09-05 15:07:45 -0600486 requested = control;
Bjorn Helgaasde189662013-09-05 15:50:52 -0600487 status = acpi_pci_osc_control_set(handle, &control,
488 OSC_PCI_EXPRESS_CAPABILITY_CONTROL);
489 if (ACPI_SUCCESS(status)) {
Bjorn Helgaas955f14b2013-09-05 15:07:45 -0600490 decode_osc_control(root, "OS now controls", control);
Bjorn Helgaasde189662013-09-05 15:50:52 -0600491 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
Bjorn Helgaas3e43abb2013-09-05 15:07:41 -0600492 /*
Matthew Garrett387d3752015-04-07 11:07:00 -0700493 * We have ASPM control, but the FADT indicates that
494 * it's unsupported. Leave existing configuration
495 * intact and prevent the OS from touching it.
Bjorn Helgaas3e43abb2013-09-05 15:07:41 -0600496 */
Matthew Garrett387d3752015-04-07 11:07:00 -0700497 dev_info(&device->dev, "FADT indicates ASPM is unsupported, using BIOS configuration\n");
498 *no_aspm = 1;
Bjorn Helgaas3e43abb2013-09-05 15:07:41 -0600499 }
500 } else {
Bjorn Helgaas955f14b2013-09-05 15:07:45 -0600501 decode_osc_control(root, "OS requested", requested);
502 decode_osc_control(root, "platform willing to grant", control);
503 dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n",
504 acpi_format_exception(status));
505
Bjorn Helgaasde189662013-09-05 15:50:52 -0600506 /*
507 * We want to disable ASPM here, but aspm_disabled
508 * needs to remain in its state from boot so that we
509 * properly handle PCIe 1.1 devices. So we set this
510 * flag here, to defer the action until after the ACPI
511 * root scan.
512 */
513 *no_aspm = 1;
Bjorn Helgaas3e43abb2013-09-05 15:07:41 -0600514 }
515}
516
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +0100517static int acpi_pci_root_add(struct acpi_device *device,
518 const struct acpi_device_id *not_used)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519{
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600520 unsigned long long segment, bus;
521 acpi_status status;
522 int result;
523 struct acpi_pci_root *root;
Jiang Liubfe24142013-05-28 18:31:27 -0600524 acpi_handle handle = device->handle;
Matthew Garrett387d3752015-04-07 11:07:00 -0700525 int no_aspm = 0;
Jiang Liu864b94a2014-11-09 22:48:03 +0800526 bool hotadd = system_state != SYSTEM_BOOTING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700528 root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
529 if (!root)
530 return -ENOMEM;
531
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600532 segment = 0;
Jiang Liubfe24142013-05-28 18:31:27 -0600533 status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL,
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600534 &segment);
535 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
Jiang Liu6dc7d222013-05-28 18:10:05 -0600536 dev_err(&device->dev, "can't evaluate _SEG\n");
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700537 result = -ENODEV;
538 goto end;
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600539 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600541 /* Check _CRS first, then _BBN. If no _BBN, default to zero. */
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700542 root->secondary.flags = IORESOURCE_BUS;
Jiang Liubfe24142013-05-28 18:31:27 -0600543 status = try_get_root_bridge_busnr(handle, &root->secondary);
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600544 if (ACPI_FAILURE(status)) {
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700545 /*
546 * We need both the start and end of the downstream bus range
547 * to interpret _CBA (MMCONFIG base address), so it really is
548 * supposed to be in _CRS. If we don't find it there, all we
549 * can do is assume [_BBN-0xFF] or [0-0xFF].
550 */
551 root->secondary.end = 0xFF;
Jiang Liu6dc7d222013-05-28 18:10:05 -0600552 dev_warn(&device->dev,
553 FW_BUG "no secondary bus range in _CRS\n");
Jiang Liubfe24142013-05-28 18:31:27 -0600554 status = acpi_evaluate_integer(handle, METHOD_NAME__BBN,
Jon Masone545b552011-06-19 18:51:37 -0500555 NULL, &bus);
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700556 if (ACPI_SUCCESS(status))
557 root->secondary.start = bus;
558 else if (status == AE_NOT_FOUND)
559 root->secondary.start = 0;
560 else {
Jiang Liu6dc7d222013-05-28 18:10:05 -0600561 dev_err(&device->dev, "can't evaluate _BBN\n");
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700562 result = -ENODEV;
563 goto end;
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600564 }
565 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566
Patrick Mochel32917e52006-05-19 16:54:39 -0400567 root->device = device;
Bjorn Helgaas07054952009-06-18 14:47:07 -0600568 root->segment = segment & 0xFFFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
570 strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700571 device->driver_data = root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572
Jiang Liu864b94a2014-11-09 22:48:03 +0800573 if (hotadd && dmar_device_add(handle)) {
574 result = -ENXIO;
575 goto end;
576 }
577
Jiang Liu6dc7d222013-05-28 18:10:05 -0600578 pr_info(PREFIX "%s [%s] (domain %04x %pR)\n",
Bjorn Helgaasd4761ba2012-10-30 15:24:50 +0900579 acpi_device_name(device), acpi_device_bid(device),
580 root->segment, &root->secondary);
581
Jiang Liubfe24142013-05-28 18:31:27 -0600582 root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle);
Jiang Liuf4b57a32012-06-22 14:55:16 +0800583
Matthew Garrett387d3752015-04-07 11:07:00 -0700584 negotiate_os_control(root, &no_aspm);
Rafael J. Wysocki415e12b2011-01-07 00:55:09 +0100585
Neil Horman3dc48af2013-08-29 16:17:05 -0400586 /*
587 * TBD: Need PCI interface for enumeration/configuration of roots.
588 */
589
590 /*
591 * Scan the Root Bridge
592 * --------------------
593 * Must do this prior to any attempt to bind the root device, as the
594 * PCI namespace does not get created until this call is made (and
595 * thus the root bridge's pci_dev does not exist).
596 */
597 root->bus = pci_acpi_scan_root(root);
598 if (!root->bus) {
599 dev_err(&device->dev,
600 "Bus %04x:%02x not present in PCI namespace\n",
601 root->segment, (unsigned int)root->secondary.start);
Rafael J. Wysockif516bde2013-11-14 00:54:17 +0100602 device->driver_data = NULL;
Neil Horman3dc48af2013-08-29 16:17:05 -0400603 result = -ENODEV;
Jiang Liu864b94a2014-11-09 22:48:03 +0800604 goto remove_dmar;
Neil Horman3dc48af2013-08-29 16:17:05 -0400605 }
606
Neil Horman3dc48af2013-08-29 16:17:05 -0400607 if (no_aspm)
608 pcie_no_aspm();
609
Rafael J. Wysockic0725302014-07-23 01:00:45 +0200610 pci_acpi_add_bus_pm_notifier(device);
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100611 if (device->wakeup.flags.run_wake)
612 device_set_run_wake(root->bus->bridge, true);
613
Jiang Liu864b94a2014-11-09 22:48:03 +0800614 if (hotadd) {
Yinghai Lu3c449ed2012-11-03 21:39:31 -0700615 pcibios_resource_survey_bus(root->bus);
Yinghai Lu39772032013-07-22 14:37:18 -0700616 pci_assign_unassigned_root_bus_resources(root->bus);
Jiang Liuc1836192015-02-05 13:44:49 +0800617 acpi_ioapic_add(root);
Jiang Liu516ca222013-05-28 18:04:46 -0600618 }
Yinghai Lu62a08c52012-10-30 14:31:32 -0600619
Rafael J. Wysocki7a3bb552014-01-10 15:23:14 +0100620 pci_lock_rescan_remove();
Bjorn Helgaascaf420c2009-06-18 14:46:57 -0600621 pci_bus_add_devices(root->bus);
Rafael J. Wysocki7a3bb552014-01-10 15:23:14 +0100622 pci_unlock_rescan_remove();
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +0100623 return 1;
Rafael J. Wysocki47525cd2012-12-21 00:36:45 +0100624
Jiang Liu864b94a2014-11-09 22:48:03 +0800625remove_dmar:
626 if (hotadd)
627 dmar_device_remove(handle);
Rafael J. Wysocki47525cd2012-12-21 00:36:45 +0100628end:
629 kfree(root);
630 return result;
Rajesh Shahc431ada2005-04-28 00:25:45 -0700631}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +0100633static void acpi_pci_root_remove(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634{
Bjorn Helgaascaf420c2009-06-18 14:46:57 -0600635 struct acpi_pci_root *root = acpi_driver_data(device);
Jiang Liuc8e9afb2012-09-18 15:20:34 +0900636
Rafael J. Wysocki7a3bb552014-01-10 15:23:14 +0100637 pci_lock_rescan_remove();
638
Yinghai Lu9738a1f2012-10-30 14:31:43 -0600639 pci_stop_root_bus(root->bus);
640
Jiang Liuc1836192015-02-05 13:44:49 +0800641 WARN_ON(acpi_ioapic_remove(root));
642
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100643 device_set_run_wake(root->bus->bridge, false);
644 pci_acpi_remove_bus_pm_notifier(device);
645
Yinghai Lu9738a1f2012-10-30 14:31:43 -0600646 pci_remove_root_bus(root->bus);
647
Jiang Liu864b94a2014-11-09 22:48:03 +0800648 dmar_device_remove(device->handle);
649
Rafael J. Wysocki7a3bb552014-01-10 15:23:14 +0100650 pci_unlock_rescan_remove();
651
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 kfree(root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653}
654
Jiang Liu2c204382015-10-14 14:29:39 +0800655/*
656 * Following code to support acpi_pci_root_create() is copied from
657 * arch/x86/pci/acpi.c and modified so it could be reused by x86, IA64
658 * and ARM64.
659 */
660static void acpi_pci_root_validate_resources(struct device *dev,
661 struct list_head *resources,
662 unsigned long type)
663{
664 LIST_HEAD(list);
665 struct resource *res1, *res2, *root = NULL;
666 struct resource_entry *tmp, *entry, *entry2;
667
668 BUG_ON((type & (IORESOURCE_MEM | IORESOURCE_IO)) == 0);
669 root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource;
670
671 list_splice_init(resources, &list);
672 resource_list_for_each_entry_safe(entry, tmp, &list) {
673 bool free = false;
674 resource_size_t end;
675
676 res1 = entry->res;
677 if (!(res1->flags & type))
678 goto next;
679
680 /* Exclude non-addressable range or non-addressable portion */
681 end = min(res1->end, root->end);
682 if (end <= res1->start) {
683 dev_info(dev, "host bridge window %pR (ignored, not CPU addressable)\n",
684 res1);
685 free = true;
686 goto next;
687 } else if (res1->end != end) {
688 dev_info(dev, "host bridge window %pR ([%#llx-%#llx] ignored, not CPU addressable)\n",
689 res1, (unsigned long long)end + 1,
690 (unsigned long long)res1->end);
691 res1->end = end;
692 }
693
694 resource_list_for_each_entry(entry2, resources) {
695 res2 = entry2->res;
696 if (!(res2->flags & type))
697 continue;
698
699 /*
700 * I don't like throwing away windows because then
701 * our resources no longer match the ACPI _CRS, but
702 * the kernel resource tree doesn't allow overlaps.
703 */
704 if (resource_overlaps(res1, res2)) {
705 res2->start = min(res1->start, res2->start);
706 res2->end = max(res1->end, res2->end);
707 dev_info(dev, "host bridge window expanded to %pR; %pR ignored\n",
708 res2, res1);
709 free = true;
710 goto next;
711 }
712 }
713
714next:
715 resource_list_del(entry);
716 if (free)
717 resource_list_free_entry(entry);
718 else
719 resource_list_add_tail(entry, resources);
720 }
721}
722
723int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info)
724{
725 int ret;
726 struct list_head *list = &info->resources;
727 struct acpi_device *device = info->bridge;
728 struct resource_entry *entry, *tmp;
729 unsigned long flags;
730
731 flags = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_MEM_8AND16BIT;
732 ret = acpi_dev_get_resources(device, list,
733 acpi_dev_filter_resource_type_cb,
734 (void *)flags);
735 if (ret < 0)
736 dev_warn(&device->dev,
737 "failed to parse _CRS method, error code %d\n", ret);
738 else if (ret == 0)
739 dev_dbg(&device->dev,
740 "no IO and memory resources present in _CRS\n");
741 else {
742 resource_list_for_each_entry_safe(entry, tmp, list) {
743 if (entry->res->flags & IORESOURCE_DISABLED)
744 resource_list_destroy_entry(entry);
745 else
746 entry->res->name = info->name;
747 }
748 acpi_pci_root_validate_resources(&device->dev, list,
749 IORESOURCE_MEM);
750 acpi_pci_root_validate_resources(&device->dev, list,
751 IORESOURCE_IO);
752 }
753
754 return ret;
755}
756
757static void pci_acpi_root_add_resources(struct acpi_pci_root_info *info)
758{
759 struct resource_entry *entry, *tmp;
760 struct resource *res, *conflict, *root = NULL;
761
762 resource_list_for_each_entry_safe(entry, tmp, &info->resources) {
763 res = entry->res;
764 if (res->flags & IORESOURCE_MEM)
765 root = &iomem_resource;
766 else if (res->flags & IORESOURCE_IO)
767 root = &ioport_resource;
768 else
769 continue;
770
Liu Jiang727ae8b2015-11-27 11:12:33 +0800771 /*
772 * Some legacy x86 host bridge drivers use iomem_resource and
773 * ioport_resource as default resource pool, skip it.
774 */
775 if (res == root)
776 continue;
777
Jiang Liu2c204382015-10-14 14:29:39 +0800778 conflict = insert_resource_conflict(root, res);
779 if (conflict) {
780 dev_info(&info->bridge->dev,
781 "ignoring host bridge window %pR (conflicts with %s %pR)\n",
782 res, conflict->name, conflict);
783 resource_list_destroy_entry(entry);
784 }
785 }
786}
787
788static void __acpi_pci_root_release_info(struct acpi_pci_root_info *info)
789{
790 struct resource *res;
791 struct resource_entry *entry, *tmp;
792
793 if (!info)
794 return;
795
796 resource_list_for_each_entry_safe(entry, tmp, &info->resources) {
797 res = entry->res;
798 if (res->parent &&
799 (res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
800 release_resource(res);
801 resource_list_destroy_entry(entry);
802 }
803
804 info->ops->release_info(info);
805}
806
807static void acpi_pci_root_release_info(struct pci_host_bridge *bridge)
808{
809 struct resource *res;
810 struct resource_entry *entry;
811
812 resource_list_for_each_entry(entry, &bridge->windows) {
813 res = entry->res;
814 if (res->parent &&
815 (res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
816 release_resource(res);
817 }
818 __acpi_pci_root_release_info(bridge->release_data);
819}
820
821struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
822 struct acpi_pci_root_ops *ops,
823 struct acpi_pci_root_info *info,
824 void *sysdata)
825{
826 int ret, busnum = root->secondary.start;
827 struct acpi_device *device = root->device;
828 int node = acpi_get_node(device->handle);
829 struct pci_bus *bus;
830
831 info->root = root;
832 info->bridge = device;
833 info->ops = ops;
834 INIT_LIST_HEAD(&info->resources);
835 snprintf(info->name, sizeof(info->name), "PCI Bus %04x:%02x",
836 root->segment, busnum);
837
838 if (ops->init_info && ops->init_info(info))
839 goto out_release_info;
840 if (ops->prepare_resources)
841 ret = ops->prepare_resources(info);
842 else
843 ret = acpi_pci_probe_root_resources(info);
844 if (ret < 0)
845 goto out_release_info;
846
847 pci_acpi_root_add_resources(info);
848 pci_add_resource(&info->resources, &root->secondary);
849 bus = pci_create_root_bus(NULL, busnum, ops->pci_ops,
850 sysdata, &info->resources);
851 if (!bus)
852 goto out_release_info;
853
854 pci_scan_child_bus(bus);
855 pci_set_host_bridge_release(to_pci_host_bridge(bus->bridge),
856 acpi_pci_root_release_info, info);
857 if (node != NUMA_NO_NODE)
858 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
859 return bus;
860
861out_release_info:
862 __acpi_pci_root_release_info(info);
863 return NULL;
864}
865
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +0100866void __init acpi_pci_root_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867{
Rafael J. Wysockid3072e62011-01-16 20:44:22 +0100868 acpi_hest_init();
Rafael J. Wysocki3338db02013-11-22 21:55:20 +0100869 if (acpi_pci_disabled)
Yinghai Lu668192b2013-01-21 13:20:48 -0800870 return;
Yinghai Lu668192b2013-01-21 13:20:48 -0800871
Rafael J. Wysocki3338db02013-11-22 21:55:20 +0100872 pci_acpi_crs_quirks();
873 acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root");
Yinghai Lu668192b2013-01-21 13:20:48 -0800874}