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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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <linux/spinlock.h>
31#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"
Len Brown4be44fc2005-08-05 00:44:28 -040048static int acpi_pci_root_add(struct acpi_device *device);
49static int acpi_pci_root_remove(struct acpi_device *device, int type);
50static int acpi_pci_root_start(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};
61MODULE_DEVICE_TABLE(acpi, root_device_ids);
62
Linus Torvalds1da177e2005-04-16 15:20:36 -070063static struct acpi_driver acpi_pci_root_driver = {
Len Brownc2b6705b2007-02-12 23:33:40 -050064 .name = "pci_root",
Len Brown4be44fc2005-08-05 00:44:28 -040065 .class = ACPI_PCI_ROOT_CLASS,
Thomas Renninger1ba90e32007-07-23 14:44:41 +020066 .ids = root_device_ids,
Len Brown4be44fc2005-08-05 00:44:28 -040067 .ops = {
68 .add = acpi_pci_root_add,
69 .remove = acpi_pci_root_remove,
70 .start = acpi_pci_root_start,
71 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070072};
73
Linus Torvalds1da177e2005-04-16 15:20:36 -070074static LIST_HEAD(acpi_pci_roots);
75
76static struct acpi_pci_driver *sub_driver;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +090077static DEFINE_MUTEX(osc_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
79int acpi_pci_register_driver(struct acpi_pci_driver *driver)
80{
81 int n = 0;
Bjorn Helgaasc1aec832009-06-18 14:47:02 -060082 struct acpi_pci_root *root;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
84 struct acpi_pci_driver **pptr = &sub_driver;
85 while (*pptr)
86 pptr = &(*pptr)->next;
87 *pptr = driver;
88
89 if (!driver->add)
90 return 0;
91
Bjorn Helgaasc1aec832009-06-18 14:47:02 -060092 list_for_each_entry(root, &acpi_pci_roots, node) {
Patrick Mochel2d1e0a02006-05-19 16:54:43 -040093 driver->add(root->device->handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 n++;
95 }
96
97 return n;
98}
Len Brown4be44fc2005-08-05 00:44:28 -040099
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100EXPORT_SYMBOL(acpi_pci_register_driver);
101
102void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
103{
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600104 struct acpi_pci_root *root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
106 struct acpi_pci_driver **pptr = &sub_driver;
107 while (*pptr) {
Akinobu Mitaf10bb252006-12-19 12:56:09 -0800108 if (*pptr == driver)
109 break;
110 pptr = &(*pptr)->next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 }
Akinobu Mitaf10bb252006-12-19 12:56:09 -0800112 BUG_ON(!*pptr);
113 *pptr = (*pptr)->next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
115 if (!driver->remove)
116 return;
117
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600118 list_for_each_entry(root, &acpi_pci_roots, node)
Patrick Mochel2d1e0a02006-05-19 16:54:43 -0400119 driver->remove(root->device->handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120}
Len Brown4be44fc2005-08-05 00:44:28 -0400121
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122EXPORT_SYMBOL(acpi_pci_unregister_driver);
123
Justin Chend91a0072006-12-06 10:17:10 -0700124acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
125{
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600126 struct acpi_pci_root *root;
Justin Chend91a0072006-12-06 10:17:10 -0700127
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600128 list_for_each_entry(root, &acpi_pci_roots, node)
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700129 if ((root->segment == (u16) seg) &&
130 (root->secondary.start == (u16) bus))
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600131 return root->device->handle;
Justin Chend91a0072006-12-06 10:17:10 -0700132 return NULL;
133}
134
135EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);
136
Alexander Chiang27558202009-06-10 19:55:14 +0000137/**
138 * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
139 * @handle - the ACPI CA node in question.
140 *
141 * Note: we could make this API take a struct acpi_device * instead, but
142 * for now, it's more convenient to operate on an acpi_handle.
143 */
144int acpi_is_root_bridge(acpi_handle handle)
145{
146 int ret;
147 struct acpi_device *device;
148
149 ret = acpi_bus_get_device(handle, &device);
150 if (ret)
151 return 0;
152
153 ret = acpi_match_device_ids(device, root_device_ids);
154 if (ret)
155 return 0;
156 else
157 return 1;
158}
159EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161static acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400162get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163{
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700164 struct resource *res = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 struct acpi_resource_address64 address;
166
Bob Moore50eca3e2005-09-30 19:03:00 -0400167 if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
168 resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
169 resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 return AE_OK;
171
172 acpi_resource_to_address64(resource, &address);
Len Brown4be44fc2005-08-05 00:44:28 -0400173 if ((address.address_length > 0) &&
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700174 (address.resource_type == ACPI_BUS_NUMBER_RANGE)) {
175 res->start = address.minimum;
176 res->end = address.minimum + address.address_length - 1;
177 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178
179 return AE_OK;
180}
181
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600182static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700183 struct resource *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184{
185 acpi_status status;
186
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700187 res->start = -1;
Len Brown4be44fc2005-08-05 00:44:28 -0400188 status =
189 acpi_walk_resources(handle, METHOD_NAME__CRS,
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700190 get_root_bridge_busnr_callback, res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 if (ACPI_FAILURE(status))
192 return status;
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700193 if (res->start == -1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 return AE_ERROR;
195 return AE_OK;
196}
197
Rui Zhang2786f6e2006-12-21 02:21:13 -0500198static void acpi_pci_bridge_scan(struct acpi_device *device)
199{
200 int status;
201 struct acpi_device *child = NULL;
202
203 if (device->flags.bus_address)
204 if (device->parent && device->parent->ops.bind) {
205 status = device->parent->ops.bind(device);
206 if (!status) {
207 list_for_each_entry(child, &device->children, node)
208 acpi_pci_bridge_scan(child);
209 }
210 }
211}
212
Shaohua Li3a9622d2009-10-29 11:04:50 +0800213static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766";
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900214
215static acpi_status acpi_pci_run_osc(acpi_handle handle,
216 const u32 *capbuf, u32 *retval)
217{
Shaohua Li3a9622d2009-10-29 11:04:50 +0800218 struct acpi_osc_context context = {
219 .uuid_str = pci_osc_uuid_str,
220 .rev = 1,
221 .cap.length = 12,
222 .cap.pointer = (void *)capbuf,
223 };
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900224 acpi_status status;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900225
Shaohua Li3a9622d2009-10-29 11:04:50 +0800226 status = acpi_run_osc(handle, &context);
227 if (ACPI_SUCCESS(status)) {
228 *retval = *((u32 *)(context.ret.pointer + 8));
229 kfree(context.ret.pointer);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900230 }
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900231 return status;
232}
233
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200234static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root,
235 u32 support,
236 u32 *control)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900237{
238 acpi_status status;
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200239 u32 result, capbuf[3];
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900240
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200241 support &= OSC_PCI_SUPPORT_MASKS;
242 support |= root->osc_support_set;
243
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900244 capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200245 capbuf[OSC_SUPPORT_TYPE] = support;
246 if (control) {
247 *control &= OSC_PCI_CONTROL_MASKS;
248 capbuf[OSC_CONTROL_TYPE] = *control | root->osc_control_set;
249 } else {
250 /* Run _OSC query for all possible controls. */
251 capbuf[OSC_CONTROL_TYPE] = OSC_PCI_CONTROL_MASKS;
252 }
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900253
254 status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
255 if (ACPI_SUCCESS(status)) {
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200256 root->osc_support_set = support;
Rafael J. Wysocki2b8fd912010-08-23 23:55:59 +0200257 if (control)
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200258 *control = result;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900259 }
260 return status;
261}
262
263static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
264{
265 acpi_status status;
266 acpi_handle tmp;
267
268 status = acpi_get_handle(root->device->handle, "_OSC", &tmp);
269 if (ACPI_FAILURE(status))
270 return status;
271 mutex_lock(&osc_lock);
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200272 status = acpi_pci_query_osc(root, flags, NULL);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900273 mutex_unlock(&osc_lock);
274 return status;
275}
276
Alex Chiang76d56de2009-07-23 17:03:00 -0600277struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900278{
279 struct acpi_pci_root *root;
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600280
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900281 list_for_each_entry(root, &acpi_pci_roots, node) {
282 if (root->device->handle == handle)
283 return root;
284 }
285 return NULL;
286}
Alex Chiang76d56de2009-07-23 17:03:00 -0600287EXPORT_SYMBOL_GPL(acpi_pci_find_root);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900288
Alexander Chiang2f7bbce2009-06-10 19:55:20 +0000289struct acpi_handle_node {
290 struct list_head node;
291 acpi_handle handle;
292};
293
294/**
295 * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev
296 * @handle: the handle in question
297 *
298 * Given an ACPI CA handle, the desired PCI device is located in the
299 * list of PCI devices.
300 *
301 * If the device is found, its reference count is increased and this
302 * function returns a pointer to its data structure. The caller must
303 * decrement the reference count by calling pci_dev_put().
304 * If no device is found, %NULL is returned.
305 */
306struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
307{
308 int dev, fn;
309 unsigned long long adr;
310 acpi_status status;
311 acpi_handle phandle;
312 struct pci_bus *pbus;
313 struct pci_dev *pdev = NULL;
314 struct acpi_handle_node *node, *tmp;
315 struct acpi_pci_root *root;
316 LIST_HEAD(device_list);
317
318 /*
319 * Walk up the ACPI CA namespace until we reach a PCI root bridge.
320 */
321 phandle = handle;
322 while (!acpi_is_root_bridge(phandle)) {
323 node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL);
324 if (!node)
325 goto out;
326
327 INIT_LIST_HEAD(&node->node);
328 node->handle = phandle;
329 list_add(&node->node, &device_list);
330
331 status = acpi_get_parent(phandle, &phandle);
332 if (ACPI_FAILURE(status))
333 goto out;
334 }
335
336 root = acpi_pci_find_root(phandle);
337 if (!root)
338 goto out;
339
340 pbus = root->bus;
341
342 /*
343 * Now, walk back down the PCI device tree until we return to our
344 * original handle. Assumes that everything between the PCI root
345 * bridge and the device we're looking for must be a P2P bridge.
346 */
347 list_for_each_entry(node, &device_list, node) {
348 acpi_handle hnd = node->handle;
349 status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr);
350 if (ACPI_FAILURE(status))
351 goto out;
352 dev = (adr >> 16) & 0xffff;
353 fn = adr & 0xffff;
354
355 pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn));
Troy Moure412af972009-06-25 17:05:35 -0600356 if (!pdev || hnd == handle)
Alexander Chiang2f7bbce2009-06-10 19:55:20 +0000357 break;
358
359 pbus = pdev->subordinate;
360 pci_dev_put(pdev);
Rafael J. Wysocki497fb542009-10-13 01:01:57 +0200361
362 /*
363 * This function may be called for a non-PCI device that has a
364 * PCI parent (eg. a disk under a PCI SATA controller). In that
365 * case pdev->subordinate will be NULL for the parent.
366 */
367 if (!pbus) {
368 dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n");
369 pdev = NULL;
370 break;
371 }
Alexander Chiang2f7bbce2009-06-10 19:55:20 +0000372 }
373out:
374 list_for_each_entry_safe(node, tmp, &device_list, node)
375 kfree(node);
376
377 return pdev;
378}
379EXPORT_SYMBOL_GPL(acpi_get_pci_dev);
380
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900381/**
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200382 * acpi_pci_osc_control_set - Request control of PCI root _OSC features.
383 * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex).
384 * @mask: Mask of _OSC bits to request control of, place to store control mask.
385 * @req: Mask of _OSC bits the control of is essential to the caller.
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900386 *
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200387 * Run _OSC query for @mask and if that is successful, compare the returned
388 * mask of control bits with @req. If all of the @req bits are set in the
389 * returned mask, run _OSC request for it.
390 *
391 * The variable at the @mask address may be modified regardless of whether or
392 * not the function returns success. On success it will contain the mask of
393 * _OSC bits the BIOS has granted control of, but its contents are meaningless
394 * on failure.
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900395 **/
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200396acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900397{
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900398 struct acpi_pci_root *root;
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200399 acpi_status status;
400 u32 ctrl, capbuf[3];
401 acpi_handle tmp;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900402
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200403 if (!mask)
404 return AE_BAD_PARAMETER;
405
406 ctrl = *mask & OSC_PCI_CONTROL_MASKS;
407 if ((ctrl & req) != req)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900408 return AE_TYPE;
409
410 root = acpi_pci_find_root(handle);
411 if (!root)
412 return AE_NOT_EXIST;
413
Rafael J. Wysockib879dc42010-08-21 01:52:37 +0200414 status = acpi_get_handle(handle, "_OSC", &tmp);
415 if (ACPI_FAILURE(status))
416 return status;
417
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900418 mutex_lock(&osc_lock);
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200419
420 *mask = ctrl | root->osc_control_set;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900421 /* No need to evaluate _OSC if the control was already granted. */
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200422 if ((root->osc_control_set & ctrl) == ctrl)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900423 goto out;
424
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200425 /* Need to check the available controls bits before requesting them. */
426 while (*mask) {
427 status = acpi_pci_query_osc(root, root->osc_support_set, mask);
428 if (ACPI_FAILURE(status))
429 goto out;
430 if (ctrl == *mask)
431 break;
432 ctrl = *mask;
433 }
Rafael J. Wysocki2b8fd912010-08-23 23:55:59 +0200434
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200435 if ((ctrl & req) != req) {
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900436 status = AE_SUPPORT;
437 goto out;
438 }
439
440 capbuf[OSC_QUERY_TYPE] = 0;
441 capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set;
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200442 capbuf[OSC_CONTROL_TYPE] = ctrl;
443 status = acpi_pci_run_osc(handle, capbuf, mask);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900444 if (ACPI_SUCCESS(status))
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200445 root->osc_control_set = *mask;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900446out:
447 mutex_unlock(&osc_lock);
448 return status;
449}
Kenji Kaneshige9f5404d2009-02-09 16:00:04 +0900450EXPORT_SYMBOL(acpi_pci_osc_control_set);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900451
Sam Ravnborgb5678a32008-02-17 13:23:03 +0100452static int __devinit acpi_pci_root_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453{
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600454 unsigned long long segment, bus;
455 acpi_status status;
456 int result;
457 struct acpi_pci_root *root;
458 acpi_handle handle;
Rui Zhang2786f6e2006-12-21 02:21:13 -0500459 struct acpi_device *child;
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700460 u32 flags, base_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700462 root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
463 if (!root)
464 return -ENOMEM;
465
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600466 segment = 0;
467 status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
468 &segment);
469 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
470 printk(KERN_ERR PREFIX "can't evaluate _SEG\n");
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700471 result = -ENODEV;
472 goto end;
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600473 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600475 /* Check _CRS first, then _BBN. If no _BBN, default to zero. */
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700476 root->secondary.flags = IORESOURCE_BUS;
477 status = try_get_root_bridge_busnr(device->handle, &root->secondary);
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600478 if (ACPI_FAILURE(status)) {
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700479 /*
480 * We need both the start and end of the downstream bus range
481 * to interpret _CBA (MMCONFIG base address), so it really is
482 * supposed to be in _CRS. If we don't find it there, all we
483 * can do is assume [_BBN-0xFF] or [0-0xFF].
484 */
485 root->secondary.end = 0xFF;
486 printk(KERN_WARNING FW_BUG PREFIX
487 "no secondary bus range in _CRS\n");
Jon Masone545b552011-06-19 18:51:37 -0500488 status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN,
489 NULL, &bus);
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700490 if (ACPI_SUCCESS(status))
491 root->secondary.start = bus;
492 else if (status == AE_NOT_FOUND)
493 root->secondary.start = 0;
494 else {
495 printk(KERN_ERR PREFIX "can't evaluate _BBN\n");
496 result = -ENODEV;
497 goto end;
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600498 }
499 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600501 INIT_LIST_HEAD(&root->node);
Patrick Mochel32917e52006-05-19 16:54:39 -0400502 root->device = device;
Bjorn Helgaas07054952009-06-18 14:47:07 -0600503 root->segment = segment & 0xFFFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
505 strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700506 device->driver_data = root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507
Andrew Patterson990a7ac2008-11-10 15:30:45 -0700508 /*
509 * All supported architectures that use ACPI have support for
510 * PCI domains, so we indicate this in _OSC support capabilities.
511 */
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700512 flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900513 acpi_pci_osc_support(root, flags);
Andrew Patterson990a7ac2008-11-10 15:30:45 -0700514
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 /*
516 * TBD: Need PCI interface for enumeration/configuration of roots.
517 */
518
Len Brown4be44fc2005-08-05 00:44:28 -0400519 /* TBD: Locking */
520 list_add_tail(&root->node, &acpi_pci_roots);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700522 printk(KERN_INFO PREFIX "%s [%s] (domain %04x %pR)\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400523 acpi_device_name(device), acpi_device_bid(device),
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700524 root->segment, &root->secondary);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525
526 /*
527 * Scan the Root Bridge
528 * --------------------
529 * Must do this prior to any attempt to bind the root device, as the
530 * PCI namespace does not get created until this call is made (and
531 * thus the root bridge's pci_dev does not exist).
532 */
Bjorn Helgaas57283772010-03-11 12:20:11 -0700533 root->bus = pci_acpi_scan_root(root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 if (!root->bus) {
Len Brown64684632006-06-26 23:41:38 -0400535 printk(KERN_ERR PREFIX
536 "Bus %04x:%02x not present in PCI namespace\n",
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700537 root->segment, (unsigned int)root->secondary.start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 result = -ENODEV;
539 goto end;
540 }
541
542 /*
543 * Attach ACPI-PCI Context
544 * -----------------------
545 * Thus binding the ACPI and PCI devices.
546 */
Alexander Chiang499650d2009-06-10 19:55:30 +0000547 result = acpi_pci_bind_root(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 if (result)
549 goto end;
550
551 /*
552 * PCI Routing Table
553 * -----------------
554 * Evaluate and parse _PRT, if exists.
555 */
Patrick Mochel2d1e0a02006-05-19 16:54:43 -0400556 status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 if (ACPI_SUCCESS(status))
Alexander Chiang859a3f82009-06-10 19:55:35 +0000558 result = acpi_pci_irq_add_prt(device->handle, root->bus);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559
Rui Zhang2786f6e2006-12-21 02:21:13 -0500560 /*
561 * Scan and bind all _ADR-Based Devices
562 */
563 list_for_each_entry(child, &device->children, node)
564 acpi_pci_bridge_scan(child);
565
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700566 /* Indicate support for various _OSC capabilities. */
567 if (pci_ext_cfg_avail(root->bus->self))
568 flags |= OSC_EXT_PCI_CONFIG_SUPPORT;
Rafael J. Wysocki8b8bae92011-03-05 13:21:51 +0100569 if (pcie_aspm_support_enabled())
Andrew Patterson3e1b1602008-11-10 15:30:55 -0700570 flags |= OSC_ACTIVE_STATE_PWR_SUPPORT |
571 OSC_CLOCK_PWR_CAPABILITY_SUPPORT;
Andrew Patterson07ae95f2008-11-10 15:31:05 -0700572 if (pci_msi_enabled())
573 flags |= OSC_MSI_SUPPORT;
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700574 if (flags != base_flags)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900575 acpi_pci_osc_support(root, flags);
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700576
Rafael J. Wysocki415e12b2011-01-07 00:55:09 +0100577 if (!pcie_ports_disabled
578 && (flags & ACPI_PCIE_REQ_SUPPORT) == ACPI_PCIE_REQ_SUPPORT) {
579 flags = OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL
580 | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL
581 | OSC_PCI_EXPRESS_PME_CONTROL;
582
583 if (pci_aer_available()) {
584 if (aer_acpi_firmware_first())
585 dev_dbg(root->bus->bridge,
586 "PCIe errors handled by BIOS.\n");
587 else
588 flags |= OSC_PCI_EXPRESS_AER_CONTROL;
589 }
590
591 dev_info(root->bus->bridge,
592 "Requesting ACPI _OSC control (0x%02x)\n", flags);
593
594 status = acpi_pci_osc_control_set(device->handle, &flags,
595 OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
Naga Chumbalkareca67312011-03-21 03:29:20 +0000596 if (ACPI_SUCCESS(status)) {
Rafael J. Wysocki415e12b2011-01-07 00:55:09 +0100597 dev_info(root->bus->bridge,
598 "ACPI _OSC control (0x%02x) granted\n", flags);
Matthew Garrett3c076352011-11-10 16:38:33 -0500599 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
600 /*
601 * We have ASPM control, but the FADT indicates
602 * that it's unsupported. Clear it.
603 */
604 pcie_clear_aspm(root->bus);
605 }
Naga Chumbalkareca67312011-03-21 03:29:20 +0000606 } else {
Rafael J. Wysockia2466702011-04-30 00:21:38 +0200607 dev_info(root->bus->bridge,
608 "ACPI _OSC request failed (%s), "
609 "returned control mask: 0x%02x\n",
610 acpi_format_exception(status), flags);
611 pr_info("ACPI _OSC control for PCIe not granted, "
612 "disabling ASPM\n");
Naga Chumbalkareca67312011-03-21 03:29:20 +0000613 pcie_no_aspm();
614 }
Rafael J. Wysockia2466702011-04-30 00:21:38 +0200615 } else {
616 dev_info(root->bus->bridge,
617 "Unable to request _OSC control "
618 "(_OSC support mask: 0x%02x)\n", flags);
Rafael J. Wysocki415e12b2011-01-07 00:55:09 +0100619 }
620
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100621 pci_acpi_add_bus_pm_notifier(device, root->bus);
622 if (device->wakeup.flags.run_wake)
623 device_set_run_wake(root->bus->bridge, true);
624
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600625 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600627end:
628 if (!list_empty(&root->node))
629 list_del(&root->node);
630 kfree(root);
Patrick Mocheld550d982006-06-27 00:41:40 -0400631 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632}
633
Len Brown4be44fc2005-08-05 00:44:28 -0400634static int acpi_pci_root_start(struct acpi_device *device)
Rajesh Shahc431ada2005-04-28 00:25:45 -0700635{
Bjorn Helgaascaf420c2009-06-18 14:46:57 -0600636 struct acpi_pci_root *root = acpi_driver_data(device);
Rajesh Shahc431ada2005-04-28 00:25:45 -0700637
Bjorn Helgaascaf420c2009-06-18 14:46:57 -0600638 pci_bus_add_devices(root->bus);
639 return 0;
Rajesh Shahc431ada2005-04-28 00:25:45 -0700640}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641
Len Brown4be44fc2005-08-05 00:44:28 -0400642static int acpi_pci_root_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643{
Bjorn Helgaascaf420c2009-06-18 14:46:57 -0600644 struct acpi_pci_root *root = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100646 device_set_run_wake(root->bus->bridge, false);
647 pci_acpi_remove_bus_pm_notifier(device);
648
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 kfree(root);
Patrick Mocheld550d982006-06-27 00:41:40 -0400650 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651}
652
Len Brown4be44fc2005-08-05 00:44:28 -0400653static int __init acpi_pci_root_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654{
Rafael J. Wysockid3072e62011-01-16 20:44:22 +0100655 acpi_hest_init();
656
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 if (acpi_pci_disabled)
Patrick Mocheld550d982006-06-27 00:41:40 -0400658 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659
Bjorn Helgaas7bc5e3f2010-02-23 10:24:41 -0700660 pci_acpi_crs_quirks();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
Patrick Mocheld550d982006-06-27 00:41:40 -0400662 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663
Patrick Mocheld550d982006-06-27 00:41:40 -0400664 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665}
666
667subsys_initcall(acpi_pci_root_init);