blob: 1dd6f6c8587442ab1fcbdf7d7bd78d98ef551a9b [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 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22 *
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24 */
25
26#include <linux/kernel.h>
27#include <linux/module.h>
28#include <linux/init.h>
29#include <linux/types.h>
Taku Izumid0020f62012-09-18 15:21:31 +090030#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/pm.h>
Rafael J. Wysockib67ea762010-02-17 23:44:09 +010032#include <linux/pm_runtime.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <linux/pci.h>
Andrew Patterson990a7ac2008-11-10 15:30:45 -070034#include <linux/pci-acpi.h>
Naga Chumbalkareca67312011-03-21 03:29:20 +000035#include <linux/pci-aspm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <linux/acpi.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090037#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <acpi/acpi_bus.h>
39#include <acpi/acpi_drivers.h>
Rafael J. Wysocki415e12b2011-01-07 00:55:09 +010040#include <acpi/apei.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Len Browna192a952009-07-28 16:45:54 -040042#define PREFIX "ACPI: "
43
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#define _COMPONENT ACPI_PCI_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050045ACPI_MODULE_NAME("pci_root");
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#define ACPI_PCI_ROOT_CLASS "pci_bridge"
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge"
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +010048static int acpi_pci_root_add(struct acpi_device *device,
49 const struct acpi_device_id *not_used);
50static void acpi_pci_root_remove(struct acpi_device *device);
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Rafael J. Wysocki415e12b2011-01-07 00:55:09 +010052#define ACPI_PCIE_REQ_SUPPORT (OSC_EXT_PCI_CONFIG_SUPPORT \
53 | OSC_ACTIVE_STATE_PWR_SUPPORT \
54 | OSC_CLOCK_PWR_CAPABILITY_SUPPORT \
55 | OSC_MSI_SUPPORT)
56
Márton Némethc97adf92010-01-10 17:15:36 +010057static const struct acpi_device_id root_device_ids[] = {
Thomas Renninger1ba90e32007-07-23 14:44:41 +020058 {"PNP0A03", 0},
59 {"", 0},
60};
Thomas Renninger1ba90e32007-07-23 14:44:41 +020061
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +010062static struct acpi_scan_handler pci_root_handler = {
Thomas Renninger1ba90e32007-07-23 14:44:41 +020063 .ids = root_device_ids,
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +010064 .attach = acpi_pci_root_add,
65 .detach = acpi_pci_root_remove,
Linus Torvalds1da177e2005-04-16 15:20:36 -070066};
67
Myron Stowec309dbb2013-04-12 05:44:30 +000068/* Lock to protect both acpi_pci_roots lists */
Taku Izumid0020f62012-09-18 15:21:31 +090069static DEFINE_MUTEX(acpi_pci_root_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070070static LIST_HEAD(acpi_pci_roots);
71
Kenji Kaneshige63f10f02009-02-09 15:59:29 +090072static DEFINE_MUTEX(osc_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
Alexander Chiang27558202009-06-10 19:55:14 +000074/**
75 * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
76 * @handle - the ACPI CA node in question.
77 *
78 * Note: we could make this API take a struct acpi_device * instead, but
79 * for now, it's more convenient to operate on an acpi_handle.
80 */
81int acpi_is_root_bridge(acpi_handle handle)
82{
83 int ret;
84 struct acpi_device *device;
85
86 ret = acpi_bus_get_device(handle, &device);
87 if (ret)
88 return 0;
89
90 ret = acpi_match_device_ids(device, root_device_ids);
91 if (ret)
92 return 0;
93 else
94 return 1;
95}
96EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
97
Linus Torvalds1da177e2005-04-16 15:20:36 -070098static acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -040099get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100{
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700101 struct resource *res = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 struct acpi_resource_address64 address;
103
Bob Moore50eca3e2005-09-30 19:03:00 -0400104 if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
105 resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
106 resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 return AE_OK;
108
109 acpi_resource_to_address64(resource, &address);
Len Brown4be44fc2005-08-05 00:44:28 -0400110 if ((address.address_length > 0) &&
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700111 (address.resource_type == ACPI_BUS_NUMBER_RANGE)) {
112 res->start = address.minimum;
113 res->end = address.minimum + address.address_length - 1;
114 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
116 return AE_OK;
117}
118
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600119static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700120 struct resource *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121{
122 acpi_status status;
123
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700124 res->start = -1;
Len Brown4be44fc2005-08-05 00:44:28 -0400125 status =
126 acpi_walk_resources(handle, METHOD_NAME__CRS,
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700127 get_root_bridge_busnr_callback, res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 if (ACPI_FAILURE(status))
129 return status;
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700130 if (res->start == -1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 return AE_ERROR;
132 return AE_OK;
133}
134
Shaohua Li3a9622d2009-10-29 11:04:50 +0800135static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766";
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900136
137static acpi_status acpi_pci_run_osc(acpi_handle handle,
138 const u32 *capbuf, u32 *retval)
139{
Shaohua Li3a9622d2009-10-29 11:04:50 +0800140 struct acpi_osc_context context = {
141 .uuid_str = pci_osc_uuid_str,
142 .rev = 1,
143 .cap.length = 12,
144 .cap.pointer = (void *)capbuf,
145 };
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900146 acpi_status status;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900147
Shaohua Li3a9622d2009-10-29 11:04:50 +0800148 status = acpi_run_osc(handle, &context);
149 if (ACPI_SUCCESS(status)) {
150 *retval = *((u32 *)(context.ret.pointer + 8));
151 kfree(context.ret.pointer);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900152 }
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900153 return status;
154}
155
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200156static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root,
157 u32 support,
158 u32 *control)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900159{
160 acpi_status status;
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200161 u32 result, capbuf[3];
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900162
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200163 support &= OSC_PCI_SUPPORT_MASKS;
164 support |= root->osc_support_set;
165
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900166 capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200167 capbuf[OSC_SUPPORT_TYPE] = support;
168 if (control) {
169 *control &= OSC_PCI_CONTROL_MASKS;
170 capbuf[OSC_CONTROL_TYPE] = *control | root->osc_control_set;
171 } else {
Yinghai Lu545d6e12013-03-28 04:28:58 +0000172 /* Run _OSC query only with existing controls. */
173 capbuf[OSC_CONTROL_TYPE] = root->osc_control_set;
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200174 }
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900175
176 status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
177 if (ACPI_SUCCESS(status)) {
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200178 root->osc_support_set = support;
Rafael J. Wysocki2b8fd912010-08-23 23:55:59 +0200179 if (control)
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200180 *control = result;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900181 }
182 return status;
183}
184
185static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
186{
187 acpi_status status;
188 acpi_handle tmp;
189
190 status = acpi_get_handle(root->device->handle, "_OSC", &tmp);
191 if (ACPI_FAILURE(status))
192 return status;
193 mutex_lock(&osc_lock);
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200194 status = acpi_pci_query_osc(root, flags, NULL);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900195 mutex_unlock(&osc_lock);
196 return status;
197}
198
Alex Chiang76d56de2009-07-23 17:03:00 -0600199struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900200{
201 struct acpi_pci_root *root;
Taku Izumicd4faf92012-09-18 15:23:23 +0900202 struct acpi_device *device;
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600203
Taku Izumicd4faf92012-09-18 15:23:23 +0900204 if (acpi_bus_get_device(handle, &device) ||
205 acpi_match_device_ids(device, root_device_ids))
206 return NULL;
207
208 root = acpi_driver_data(device);
209
210 return root;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900211}
Alex Chiang76d56de2009-07-23 17:03:00 -0600212EXPORT_SYMBOL_GPL(acpi_pci_find_root);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900213
Alexander Chiang2f7bbce2009-06-10 19:55:20 +0000214struct acpi_handle_node {
215 struct list_head node;
216 acpi_handle handle;
217};
218
219/**
220 * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev
221 * @handle: the handle in question
222 *
223 * Given an ACPI CA handle, the desired PCI device is located in the
224 * list of PCI devices.
225 *
226 * If the device is found, its reference count is increased and this
227 * function returns a pointer to its data structure. The caller must
228 * decrement the reference count by calling pci_dev_put().
229 * If no device is found, %NULL is returned.
230 */
231struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
232{
233 int dev, fn;
234 unsigned long long adr;
235 acpi_status status;
236 acpi_handle phandle;
237 struct pci_bus *pbus;
238 struct pci_dev *pdev = NULL;
239 struct acpi_handle_node *node, *tmp;
240 struct acpi_pci_root *root;
241 LIST_HEAD(device_list);
242
243 /*
244 * Walk up the ACPI CA namespace until we reach a PCI root bridge.
245 */
246 phandle = handle;
247 while (!acpi_is_root_bridge(phandle)) {
248 node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL);
249 if (!node)
250 goto out;
251
252 INIT_LIST_HEAD(&node->node);
253 node->handle = phandle;
254 list_add(&node->node, &device_list);
255
256 status = acpi_get_parent(phandle, &phandle);
257 if (ACPI_FAILURE(status))
258 goto out;
259 }
260
261 root = acpi_pci_find_root(phandle);
262 if (!root)
263 goto out;
264
265 pbus = root->bus;
266
267 /*
268 * Now, walk back down the PCI device tree until we return to our
269 * original handle. Assumes that everything between the PCI root
270 * bridge and the device we're looking for must be a P2P bridge.
271 */
272 list_for_each_entry(node, &device_list, node) {
273 acpi_handle hnd = node->handle;
274 status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr);
275 if (ACPI_FAILURE(status))
276 goto out;
277 dev = (adr >> 16) & 0xffff;
278 fn = adr & 0xffff;
279
280 pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn));
Troy Moure412af972009-06-25 17:05:35 -0600281 if (!pdev || hnd == handle)
Alexander Chiang2f7bbce2009-06-10 19:55:20 +0000282 break;
283
284 pbus = pdev->subordinate;
285 pci_dev_put(pdev);
Rafael J. Wysocki497fb542009-10-13 01:01:57 +0200286
287 /*
288 * This function may be called for a non-PCI device that has a
289 * PCI parent (eg. a disk under a PCI SATA controller). In that
290 * case pdev->subordinate will be NULL for the parent.
291 */
292 if (!pbus) {
293 dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n");
294 pdev = NULL;
295 break;
296 }
Alexander Chiang2f7bbce2009-06-10 19:55:20 +0000297 }
298out:
299 list_for_each_entry_safe(node, tmp, &device_list, node)
300 kfree(node);
301
302 return pdev;
303}
304EXPORT_SYMBOL_GPL(acpi_get_pci_dev);
305
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900306/**
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200307 * acpi_pci_osc_control_set - Request control of PCI root _OSC features.
308 * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex).
309 * @mask: Mask of _OSC bits to request control of, place to store control mask.
310 * @req: Mask of _OSC bits the control of is essential to the caller.
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900311 *
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200312 * Run _OSC query for @mask and if that is successful, compare the returned
313 * mask of control bits with @req. If all of the @req bits are set in the
314 * returned mask, run _OSC request for it.
315 *
316 * The variable at the @mask address may be modified regardless of whether or
317 * not the function returns success. On success it will contain the mask of
318 * _OSC bits the BIOS has granted control of, but its contents are meaningless
319 * on failure.
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900320 **/
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200321acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900322{
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900323 struct acpi_pci_root *root;
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200324 acpi_status status;
325 u32 ctrl, capbuf[3];
326 acpi_handle tmp;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900327
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200328 if (!mask)
329 return AE_BAD_PARAMETER;
330
331 ctrl = *mask & OSC_PCI_CONTROL_MASKS;
332 if ((ctrl & req) != req)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900333 return AE_TYPE;
334
335 root = acpi_pci_find_root(handle);
336 if (!root)
337 return AE_NOT_EXIST;
338
Rafael J. Wysockib879dc42010-08-21 01:52:37 +0200339 status = acpi_get_handle(handle, "_OSC", &tmp);
340 if (ACPI_FAILURE(status))
341 return status;
342
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900343 mutex_lock(&osc_lock);
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200344
345 *mask = ctrl | root->osc_control_set;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900346 /* No need to evaluate _OSC if the control was already granted. */
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200347 if ((root->osc_control_set & ctrl) == ctrl)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900348 goto out;
349
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200350 /* Need to check the available controls bits before requesting them. */
351 while (*mask) {
352 status = acpi_pci_query_osc(root, root->osc_support_set, mask);
353 if (ACPI_FAILURE(status))
354 goto out;
355 if (ctrl == *mask)
356 break;
357 ctrl = *mask;
358 }
Rafael J. Wysocki2b8fd912010-08-23 23:55:59 +0200359
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200360 if ((ctrl & req) != req) {
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900361 status = AE_SUPPORT;
362 goto out;
363 }
364
365 capbuf[OSC_QUERY_TYPE] = 0;
366 capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set;
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200367 capbuf[OSC_CONTROL_TYPE] = ctrl;
368 status = acpi_pci_run_osc(handle, capbuf, mask);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900369 if (ACPI_SUCCESS(status))
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200370 root->osc_control_set = *mask;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900371out:
372 mutex_unlock(&osc_lock);
373 return status;
374}
Kenji Kaneshige9f5404d2009-02-09 16:00:04 +0900375EXPORT_SYMBOL(acpi_pci_osc_control_set);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900376
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +0100377static int acpi_pci_root_add(struct acpi_device *device,
378 const struct acpi_device_id *not_used)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379{
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600380 unsigned long long segment, bus;
381 acpi_status status;
382 int result;
383 struct acpi_pci_root *root;
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700384 u32 flags, base_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700386 root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
387 if (!root)
388 return -ENOMEM;
389
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600390 segment = 0;
391 status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
392 &segment);
393 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
394 printk(KERN_ERR PREFIX "can't evaluate _SEG\n");
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700395 result = -ENODEV;
396 goto end;
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600397 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600399 /* Check _CRS first, then _BBN. If no _BBN, default to zero. */
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700400 root->secondary.flags = IORESOURCE_BUS;
401 status = try_get_root_bridge_busnr(device->handle, &root->secondary);
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600402 if (ACPI_FAILURE(status)) {
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700403 /*
404 * We need both the start and end of the downstream bus range
405 * to interpret _CBA (MMCONFIG base address), so it really is
406 * supposed to be in _CRS. If we don't find it there, all we
407 * can do is assume [_BBN-0xFF] or [0-0xFF].
408 */
409 root->secondary.end = 0xFF;
410 printk(KERN_WARNING FW_BUG PREFIX
411 "no secondary bus range in _CRS\n");
Jon Masone545b552011-06-19 18:51:37 -0500412 status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN,
413 NULL, &bus);
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700414 if (ACPI_SUCCESS(status))
415 root->secondary.start = bus;
416 else if (status == AE_NOT_FOUND)
417 root->secondary.start = 0;
418 else {
419 printk(KERN_ERR PREFIX "can't evaluate _BBN\n");
420 result = -ENODEV;
421 goto end;
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600422 }
423 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600425 INIT_LIST_HEAD(&root->node);
Patrick Mochel32917e52006-05-19 16:54:39 -0400426 root->device = device;
Bjorn Helgaas07054952009-06-18 14:47:07 -0600427 root->segment = segment & 0xFFFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
429 strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700430 device->driver_data = root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431
Bjorn Helgaasd4761ba2012-10-30 15:24:50 +0900432 printk(KERN_INFO PREFIX "%s [%s] (domain %04x %pR)\n",
433 acpi_device_name(device), acpi_device_bid(device),
434 root->segment, &root->secondary);
435
Jiang Liuf4b57a32012-06-22 14:55:16 +0800436 root->mcfg_addr = acpi_pci_root_get_mcfg_addr(device->handle);
437
Andrew Patterson990a7ac2008-11-10 15:30:45 -0700438 /*
439 * All supported architectures that use ACPI have support for
440 * PCI domains, so we indicate this in _OSC support capabilities.
441 */
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700442 flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900443 acpi_pci_osc_support(root, flags);
Andrew Patterson990a7ac2008-11-10 15:30:45 -0700444
Bjorn Helgaasb8178f12013-04-01 15:47:39 -0600445 /*
446 * TBD: Need PCI interface for enumeration/configuration of roots.
447 */
448
449 mutex_lock(&acpi_pci_root_lock);
450 list_add_tail(&root->node, &acpi_pci_roots);
451 mutex_unlock(&acpi_pci_root_lock);
452
453 /*
454 * Scan the Root Bridge
455 * --------------------
456 * Must do this prior to any attempt to bind the root device, as the
457 * PCI namespace does not get created until this call is made (and
458 * thus the root bridge's pci_dev does not exist).
459 */
460 root->bus = pci_acpi_scan_root(root);
461 if (!root->bus) {
462 printk(KERN_ERR PREFIX
463 "Bus %04x:%02x not present in PCI namespace\n",
464 root->segment, (unsigned int)root->secondary.start);
465 result = -ENODEV;
466 goto out_del_root;
467 }
468
Taku Izumi8c33f512012-10-30 15:27:13 +0900469 /* Indicate support for various _OSC capabilities. */
470 if (pci_ext_cfg_avail())
471 flags |= OSC_EXT_PCI_CONFIG_SUPPORT;
472 if (pcie_aspm_support_enabled()) {
473 flags |= OSC_ACTIVE_STATE_PWR_SUPPORT |
474 OSC_CLOCK_PWR_CAPABILITY_SUPPORT;
475 }
476 if (pci_msi_enabled())
477 flags |= OSC_MSI_SUPPORT;
478 if (flags != base_flags) {
479 status = acpi_pci_osc_support(root, flags);
480 if (ACPI_FAILURE(status)) {
481 dev_info(&device->dev, "ACPI _OSC support "
482 "notification failed, disabling PCIe ASPM\n");
483 pcie_no_aspm();
484 flags = base_flags;
485 }
486 }
Bjorn Helgaasb8178f12013-04-01 15:47:39 -0600487
Taku Izumi8c33f512012-10-30 15:27:13 +0900488 if (!pcie_ports_disabled
489 && (flags & ACPI_PCIE_REQ_SUPPORT) == ACPI_PCIE_REQ_SUPPORT) {
490 flags = OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL
491 | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL
492 | OSC_PCI_EXPRESS_PME_CONTROL;
493
494 if (pci_aer_available()) {
495 if (aer_acpi_firmware_first())
496 dev_dbg(&device->dev,
497 "PCIe errors handled by BIOS.\n");
498 else
499 flags |= OSC_PCI_EXPRESS_AER_CONTROL;
500 }
501
502 dev_info(&device->dev,
503 "Requesting ACPI _OSC control (0x%02x)\n", flags);
504
505 status = acpi_pci_osc_control_set(device->handle, &flags,
506 OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
507 if (ACPI_SUCCESS(status)) {
Taku Izumi8c33f512012-10-30 15:27:13 +0900508 dev_info(&device->dev,
509 "ACPI _OSC control (0x%02x) granted\n", flags);
Bjorn Helgaasb8178f12013-04-01 15:47:39 -0600510 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
511 /*
512 * We have ASPM control, but the FADT indicates
513 * that it's unsupported. Clear it.
514 */
515 pcie_clear_aspm(root->bus);
516 }
Taku Izumi8c33f512012-10-30 15:27:13 +0900517 } else {
Taku Izumi8c33f512012-10-30 15:27:13 +0900518 dev_info(&device->dev,
519 "ACPI _OSC request failed (%s), "
520 "returned control mask: 0x%02x\n",
521 acpi_format_exception(status), flags);
Bjorn Helgaasb8178f12013-04-01 15:47:39 -0600522 pr_info("ACPI _OSC control for PCIe not granted, "
523 "disabling ASPM\n");
524 pcie_no_aspm();
Taku Izumi8c33f512012-10-30 15:27:13 +0900525 }
526 } else {
527 dev_info(&device->dev,
Bjorn Helgaasb8178f12013-04-01 15:47:39 -0600528 "Unable to request _OSC control "
529 "(_OSC support mask: 0x%02x)\n", flags);
Rafael J. Wysocki415e12b2011-01-07 00:55:09 +0100530 }
531
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100532 pci_acpi_add_bus_pm_notifier(device, root->bus);
533 if (device->wakeup.flags.run_wake)
534 device_set_run_wake(root->bus->bridge, true);
535
Yinghai Lu3c449ed2012-11-03 21:39:31 -0700536 if (system_state != SYSTEM_BOOTING) {
537 pcibios_resource_survey_bus(root->bus);
Yinghai Lu62a08c52012-10-30 14:31:32 -0600538 pci_assign_unassigned_bus_resources(root->bus);
Yinghai Lu3c449ed2012-11-03 21:39:31 -0700539 }
Yinghai Lu62a08c52012-10-30 14:31:32 -0600540
Yinghai Lu62a08c52012-10-30 14:31:32 -0600541 /* need to after hot-added ioapic is registered */
542 if (system_state != SYSTEM_BOOTING)
543 pci_enable_bridges(root->bus);
544
Bjorn Helgaascaf420c2009-06-18 14:46:57 -0600545 pci_bus_add_devices(root->bus);
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +0100546 return 1;
Rafael J. Wysocki47525cd2012-12-21 00:36:45 +0100547
548out_del_root:
549 mutex_lock(&acpi_pci_root_lock);
550 list_del(&root->node);
551 mutex_unlock(&acpi_pci_root_lock);
552
Rafael J. Wysocki47525cd2012-12-21 00:36:45 +0100553end:
554 kfree(root);
555 return result;
Rajesh Shahc431ada2005-04-28 00:25:45 -0700556}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +0100558static void acpi_pci_root_remove(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559{
Bjorn Helgaascaf420c2009-06-18 14:46:57 -0600560 struct acpi_pci_root *root = acpi_driver_data(device);
Jiang Liuc8e9afb2012-09-18 15:20:34 +0900561
Yinghai Lu9738a1f2012-10-30 14:31:43 -0600562 pci_stop_root_bus(root->bus);
563
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100564 device_set_run_wake(root->bus->bridge, false);
565 pci_acpi_remove_bus_pm_notifier(device);
566
Yinghai Lu9738a1f2012-10-30 14:31:43 -0600567 pci_remove_root_bus(root->bus);
568
569 mutex_lock(&acpi_pci_root_lock);
Taku Izumi6507e6e2012-09-18 15:24:40 +0900570 list_del(&root->node);
571 mutex_unlock(&acpi_pci_root_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 kfree(root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573}
574
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +0100575void __init acpi_pci_root_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576{
Rafael J. Wysockid3072e62011-01-16 20:44:22 +0100577 acpi_hest_init();
578
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +0100579 if (!acpi_pci_disabled) {
580 pci_acpi_crs_quirks();
581 acpi_scan_add_handler(&pci_root_handler);
582 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583}
Yinghai Lu668192b2013-01-21 13:20:48 -0800584/* Support root bridge hotplug */
585
586static void handle_root_bridge_insertion(acpi_handle handle)
587{
588 struct acpi_device *device;
589
590 if (!acpi_bus_get_device(handle, &device)) {
591 printk(KERN_DEBUG "acpi device exists...\n");
592 return;
593 }
594
595 if (acpi_bus_scan(handle))
596 printk(KERN_ERR "cannot add bridge to acpi list\n");
597}
598
599static void handle_root_bridge_removal(struct acpi_device *device)
600{
Yinghai Lub8b66112013-03-11 05:05:16 +0000601 acpi_status status;
Yinghai Lu668192b2013-01-21 13:20:48 -0800602 struct acpi_eject_event *ej_event;
603
604 ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
605 if (!ej_event) {
606 /* Inform firmware the hot-remove operation has error */
607 (void) acpi_evaluate_hotplug_ost(device->handle,
608 ACPI_NOTIFY_EJECT_REQUEST,
609 ACPI_OST_SC_NON_SPECIFIC_FAILURE,
610 NULL);
611 return;
612 }
613
614 ej_event->device = device;
615 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
616
Yinghai Lub8b66112013-03-11 05:05:16 +0000617 status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
618 if (ACPI_FAILURE(status))
619 kfree(ej_event);
Yinghai Lu668192b2013-01-21 13:20:48 -0800620}
621
622static void _handle_hotplug_event_root(struct work_struct *work)
623{
624 struct acpi_pci_root *root;
625 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER };
626 struct acpi_hp_work *hp_work;
627 acpi_handle handle;
628 u32 type;
629
630 hp_work = container_of(work, struct acpi_hp_work, work);
631 handle = hp_work->handle;
632 type = hp_work->type;
633
Yinghai Lub8b66112013-03-11 05:05:16 +0000634 acpi_scan_lock_acquire();
Yinghai Lu668192b2013-01-21 13:20:48 -0800635
Yinghai Lub8b66112013-03-11 05:05:16 +0000636 root = acpi_pci_find_root(handle);
Yinghai Lu668192b2013-01-21 13:20:48 -0800637 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
638
639 switch (type) {
640 case ACPI_NOTIFY_BUS_CHECK:
641 /* bus enumerate */
642 printk(KERN_DEBUG "%s: Bus check notify on %s\n", __func__,
643 (char *)buffer.pointer);
644 if (!root)
645 handle_root_bridge_insertion(handle);
646
647 break;
648
649 case ACPI_NOTIFY_DEVICE_CHECK:
650 /* device check */
651 printk(KERN_DEBUG "%s: Device check notify on %s\n", __func__,
652 (char *)buffer.pointer);
653 if (!root)
654 handle_root_bridge_insertion(handle);
655 break;
656
657 case ACPI_NOTIFY_EJECT_REQUEST:
658 /* request device eject */
659 printk(KERN_DEBUG "%s: Device eject notify on %s\n", __func__,
660 (char *)buffer.pointer);
661 if (root)
662 handle_root_bridge_removal(root->device);
663 break;
664 default:
665 printk(KERN_WARNING "notify_handler: unknown event type 0x%x for %s\n",
666 type, (char *)buffer.pointer);
667 break;
668 }
669
Yinghai Lub8b66112013-03-11 05:05:16 +0000670 acpi_scan_lock_release();
Yinghai Lu668192b2013-01-21 13:20:48 -0800671 kfree(hp_work); /* allocated in handle_hotplug_event_bridge */
672 kfree(buffer.pointer);
673}
674
675static void handle_hotplug_event_root(acpi_handle handle, u32 type,
676 void *context)
677{
678 alloc_acpi_hp_work(handle, type, context,
679 _handle_hotplug_event_root);
680}
681
682static acpi_status __init
683find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
684{
Tang Chen121b0902013-01-21 13:20:49 -0800685 acpi_status status;
Yinghai Lu668192b2013-01-21 13:20:48 -0800686 char objname[64];
687 struct acpi_buffer buffer = { .length = sizeof(objname),
688 .pointer = objname };
689 int *count = (int *)context;
690
691 if (!acpi_is_root_bridge(handle))
692 return AE_OK;
693
694 (*count)++;
695
696 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
697
Tang Chen121b0902013-01-21 13:20:49 -0800698 status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
699 handle_hotplug_event_root, NULL);
700 if (ACPI_FAILURE(status))
701 printk(KERN_DEBUG "acpi root: %s notify handler is not installed, exit status: %u\n",
702 objname, (unsigned int)status);
703 else
704 printk(KERN_DEBUG "acpi root: %s notify handler is installed\n",
705 objname);
Yinghai Lu668192b2013-01-21 13:20:48 -0800706
707 return AE_OK;
708}
709
710void __init acpi_pci_root_hp_init(void)
711{
712 int num = 0;
713
714 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
715 ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL);
716
717 printk(KERN_DEBUG "Found %d acpi root devices\n", num);
718}