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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>
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"
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 Brownc2b67052007-02-12 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
Taku Izumid0020f62012-09-18 15:21:31 +090074/* Lock to protect both acpi_pci_roots and acpi_pci_drivers lists */
75static DEFINE_MUTEX(acpi_pci_root_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070076static LIST_HEAD(acpi_pci_roots);
Jiang Liu8ee5bdf2012-09-18 15:19:49 +090077static LIST_HEAD(acpi_pci_drivers);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
Kenji Kaneshige63f10f02009-02-09 15:59:29 +090079static DEFINE_MUTEX(osc_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
81int acpi_pci_register_driver(struct acpi_pci_driver *driver)
82{
83 int n = 0;
Bjorn Helgaasc1aec832009-06-18 14:47:02 -060084 struct acpi_pci_root *root;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
Taku Izumid0020f62012-09-18 15:21:31 +090086 mutex_lock(&acpi_pci_root_lock);
Jiang Liu8ee5bdf2012-09-18 15:19:49 +090087 list_add_tail(&driver->node, &acpi_pci_drivers);
Taku Izumid0020f62012-09-18 15:21:31 +090088 if (driver->add)
89 list_for_each_entry(root, &acpi_pci_roots, node) {
Taku Izumi55bfe3c2012-09-18 15:22:35 +090090 driver->add(root);
Taku Izumid0020f62012-09-18 15:21:31 +090091 n++;
92 }
93 mutex_unlock(&acpi_pci_root_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
95 return n;
96}
97EXPORT_SYMBOL(acpi_pci_register_driver);
98
99void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
100{
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600101 struct acpi_pci_root *root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
Taku Izumid0020f62012-09-18 15:21:31 +0900103 mutex_lock(&acpi_pci_root_lock);
Jiang Liu8ee5bdf2012-09-18 15:19:49 +0900104 list_del(&driver->node);
Taku Izumid0020f62012-09-18 15:21:31 +0900105 if (driver->remove)
106 list_for_each_entry(root, &acpi_pci_roots, node)
Taku Izumi55bfe3c2012-09-18 15:22:35 +0900107 driver->remove(root);
Taku Izumid0020f62012-09-18 15:21:31 +0900108 mutex_unlock(&acpi_pci_root_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109}
110EXPORT_SYMBOL(acpi_pci_unregister_driver);
111
Justin Chend91a0072006-12-06 10:17:10 -0700112acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
113{
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600114 struct acpi_pci_root *root;
Taku Izumi6507e6e2012-09-18 15:24:40 +0900115 acpi_handle handle = NULL;
Justin Chend91a0072006-12-06 10:17:10 -0700116
Taku Izumi6507e6e2012-09-18 15:24:40 +0900117 mutex_lock(&acpi_pci_root_lock);
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600118 list_for_each_entry(root, &acpi_pci_roots, node)
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700119 if ((root->segment == (u16) seg) &&
Taku Izumi6507e6e2012-09-18 15:24:40 +0900120 (root->secondary.start == (u16) bus)) {
121 handle = root->device->handle;
122 break;
123 }
124 mutex_unlock(&acpi_pci_root_lock);
125 return handle;
Justin Chend91a0072006-12-06 10:17:10 -0700126}
127
128EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);
129
Alexander Chiang27558202009-06-10 19:55:14 +0000130/**
131 * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
132 * @handle - the ACPI CA node in question.
133 *
134 * Note: we could make this API take a struct acpi_device * instead, but
135 * for now, it's more convenient to operate on an acpi_handle.
136 */
137int acpi_is_root_bridge(acpi_handle handle)
138{
139 int ret;
140 struct acpi_device *device;
141
142 ret = acpi_bus_get_device(handle, &device);
143 if (ret)
144 return 0;
145
146 ret = acpi_match_device_ids(device, root_device_ids);
147 if (ret)
148 return 0;
149 else
150 return 1;
151}
152EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
153
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154static acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400155get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156{
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700157 struct resource *res = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 struct acpi_resource_address64 address;
159
Bob Moore50eca3e2005-09-30 19:03:00 -0400160 if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
161 resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
162 resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 return AE_OK;
164
165 acpi_resource_to_address64(resource, &address);
Len Brown4be44fc2005-08-05 00:44:28 -0400166 if ((address.address_length > 0) &&
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700167 (address.resource_type == ACPI_BUS_NUMBER_RANGE)) {
168 res->start = address.minimum;
169 res->end = address.minimum + address.address_length - 1;
170 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
172 return AE_OK;
173}
174
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600175static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700176 struct resource *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177{
178 acpi_status status;
179
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700180 res->start = -1;
Len Brown4be44fc2005-08-05 00:44:28 -0400181 status =
182 acpi_walk_resources(handle, METHOD_NAME__CRS,
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700183 get_root_bridge_busnr_callback, res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 if (ACPI_FAILURE(status))
185 return status;
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700186 if (res->start == -1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 return AE_ERROR;
188 return AE_OK;
189}
190
Rui Zhang2786f6e2006-12-21 02:21:13 -0500191static void acpi_pci_bridge_scan(struct acpi_device *device)
192{
193 int status;
194 struct acpi_device *child = NULL;
195
196 if (device->flags.bus_address)
197 if (device->parent && device->parent->ops.bind) {
198 status = device->parent->ops.bind(device);
199 if (!status) {
200 list_for_each_entry(child, &device->children, node)
201 acpi_pci_bridge_scan(child);
202 }
203 }
204}
205
Shaohua Li3a9622d2009-10-29 11:04:50 +0800206static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766";
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900207
208static acpi_status acpi_pci_run_osc(acpi_handle handle,
209 const u32 *capbuf, u32 *retval)
210{
Shaohua Li3a9622d2009-10-29 11:04:50 +0800211 struct acpi_osc_context context = {
212 .uuid_str = pci_osc_uuid_str,
213 .rev = 1,
214 .cap.length = 12,
215 .cap.pointer = (void *)capbuf,
216 };
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900217 acpi_status status;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900218
Shaohua Li3a9622d2009-10-29 11:04:50 +0800219 status = acpi_run_osc(handle, &context);
220 if (ACPI_SUCCESS(status)) {
221 *retval = *((u32 *)(context.ret.pointer + 8));
222 kfree(context.ret.pointer);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900223 }
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900224 return status;
225}
226
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200227static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root,
228 u32 support,
229 u32 *control)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900230{
231 acpi_status status;
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200232 u32 result, capbuf[3];
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900233
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200234 support &= OSC_PCI_SUPPORT_MASKS;
235 support |= root->osc_support_set;
236
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900237 capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200238 capbuf[OSC_SUPPORT_TYPE] = support;
239 if (control) {
240 *control &= OSC_PCI_CONTROL_MASKS;
241 capbuf[OSC_CONTROL_TYPE] = *control | root->osc_control_set;
242 } else {
243 /* Run _OSC query for all possible controls. */
244 capbuf[OSC_CONTROL_TYPE] = OSC_PCI_CONTROL_MASKS;
245 }
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900246
247 status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
248 if (ACPI_SUCCESS(status)) {
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200249 root->osc_support_set = support;
Rafael J. Wysocki2b8fd912010-08-23 23:55:59 +0200250 if (control)
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200251 *control = result;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900252 }
253 return status;
254}
255
256static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
257{
258 acpi_status status;
259 acpi_handle tmp;
260
261 status = acpi_get_handle(root->device->handle, "_OSC", &tmp);
262 if (ACPI_FAILURE(status))
263 return status;
264 mutex_lock(&osc_lock);
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200265 status = acpi_pci_query_osc(root, flags, NULL);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900266 mutex_unlock(&osc_lock);
267 return status;
268}
269
Alex Chiang76d56de2009-07-23 17:03:00 -0600270struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900271{
272 struct acpi_pci_root *root;
Taku Izumicd4faf92012-09-18 15:23:23 +0900273 struct acpi_device *device;
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600274
Taku Izumicd4faf92012-09-18 15:23:23 +0900275 if (acpi_bus_get_device(handle, &device) ||
276 acpi_match_device_ids(device, root_device_ids))
277 return NULL;
278
279 root = acpi_driver_data(device);
280
281 return root;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900282}
Alex Chiang76d56de2009-07-23 17:03:00 -0600283EXPORT_SYMBOL_GPL(acpi_pci_find_root);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900284
Alexander Chiang2f7bbce2009-06-10 19:55:20 +0000285struct acpi_handle_node {
286 struct list_head node;
287 acpi_handle handle;
288};
289
290/**
291 * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev
292 * @handle: the handle in question
293 *
294 * Given an ACPI CA handle, the desired PCI device is located in the
295 * list of PCI devices.
296 *
297 * If the device is found, its reference count is increased and this
298 * function returns a pointer to its data structure. The caller must
299 * decrement the reference count by calling pci_dev_put().
300 * If no device is found, %NULL is returned.
301 */
302struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
303{
304 int dev, fn;
305 unsigned long long adr;
306 acpi_status status;
307 acpi_handle phandle;
308 struct pci_bus *pbus;
309 struct pci_dev *pdev = NULL;
310 struct acpi_handle_node *node, *tmp;
311 struct acpi_pci_root *root;
312 LIST_HEAD(device_list);
313
314 /*
315 * Walk up the ACPI CA namespace until we reach a PCI root bridge.
316 */
317 phandle = handle;
318 while (!acpi_is_root_bridge(phandle)) {
319 node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL);
320 if (!node)
321 goto out;
322
323 INIT_LIST_HEAD(&node->node);
324 node->handle = phandle;
325 list_add(&node->node, &device_list);
326
327 status = acpi_get_parent(phandle, &phandle);
328 if (ACPI_FAILURE(status))
329 goto out;
330 }
331
332 root = acpi_pci_find_root(phandle);
333 if (!root)
334 goto out;
335
336 pbus = root->bus;
337
338 /*
339 * Now, walk back down the PCI device tree until we return to our
340 * original handle. Assumes that everything between the PCI root
341 * bridge and the device we're looking for must be a P2P bridge.
342 */
343 list_for_each_entry(node, &device_list, node) {
344 acpi_handle hnd = node->handle;
345 status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr);
346 if (ACPI_FAILURE(status))
347 goto out;
348 dev = (adr >> 16) & 0xffff;
349 fn = adr & 0xffff;
350
351 pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn));
Troy Moure412af972009-06-25 17:05:35 -0600352 if (!pdev || hnd == handle)
Alexander Chiang2f7bbce2009-06-10 19:55:20 +0000353 break;
354
355 pbus = pdev->subordinate;
356 pci_dev_put(pdev);
Rafael J. Wysocki497fb542009-10-13 01:01:57 +0200357
358 /*
359 * This function may be called for a non-PCI device that has a
360 * PCI parent (eg. a disk under a PCI SATA controller). In that
361 * case pdev->subordinate will be NULL for the parent.
362 */
363 if (!pbus) {
364 dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n");
365 pdev = NULL;
366 break;
367 }
Alexander Chiang2f7bbce2009-06-10 19:55:20 +0000368 }
369out:
370 list_for_each_entry_safe(node, tmp, &device_list, node)
371 kfree(node);
372
373 return pdev;
374}
375EXPORT_SYMBOL_GPL(acpi_get_pci_dev);
376
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900377/**
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200378 * acpi_pci_osc_control_set - Request control of PCI root _OSC features.
379 * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex).
380 * @mask: Mask of _OSC bits to request control of, place to store control mask.
381 * @req: Mask of _OSC bits the control of is essential to the caller.
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900382 *
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200383 * Run _OSC query for @mask and if that is successful, compare the returned
384 * mask of control bits with @req. If all of the @req bits are set in the
385 * returned mask, run _OSC request for it.
386 *
387 * The variable at the @mask address may be modified regardless of whether or
388 * not the function returns success. On success it will contain the mask of
389 * _OSC bits the BIOS has granted control of, but its contents are meaningless
390 * on failure.
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900391 **/
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200392acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900393{
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900394 struct acpi_pci_root *root;
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200395 acpi_status status;
396 u32 ctrl, capbuf[3];
397 acpi_handle tmp;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900398
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200399 if (!mask)
400 return AE_BAD_PARAMETER;
401
402 ctrl = *mask & OSC_PCI_CONTROL_MASKS;
403 if ((ctrl & req) != req)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900404 return AE_TYPE;
405
406 root = acpi_pci_find_root(handle);
407 if (!root)
408 return AE_NOT_EXIST;
409
Rafael J. Wysockib879dc42010-08-21 01:52:37 +0200410 status = acpi_get_handle(handle, "_OSC", &tmp);
411 if (ACPI_FAILURE(status))
412 return status;
413
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900414 mutex_lock(&osc_lock);
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200415
416 *mask = ctrl | root->osc_control_set;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900417 /* No need to evaluate _OSC if the control was already granted. */
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200418 if ((root->osc_control_set & ctrl) == ctrl)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900419 goto out;
420
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200421 /* Need to check the available controls bits before requesting them. */
422 while (*mask) {
423 status = acpi_pci_query_osc(root, root->osc_support_set, mask);
424 if (ACPI_FAILURE(status))
425 goto out;
426 if (ctrl == *mask)
427 break;
428 ctrl = *mask;
429 }
Rafael J. Wysocki2b8fd912010-08-23 23:55:59 +0200430
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200431 if ((ctrl & req) != req) {
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900432 status = AE_SUPPORT;
433 goto out;
434 }
435
436 capbuf[OSC_QUERY_TYPE] = 0;
437 capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set;
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200438 capbuf[OSC_CONTROL_TYPE] = ctrl;
439 status = acpi_pci_run_osc(handle, capbuf, mask);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900440 if (ACPI_SUCCESS(status))
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200441 root->osc_control_set = *mask;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900442out:
443 mutex_unlock(&osc_lock);
444 return status;
445}
Kenji Kaneshige9f5404d2009-02-09 16:00:04 +0900446EXPORT_SYMBOL(acpi_pci_osc_control_set);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900447
Sam Ravnborgb5678a32008-02-17 13:23:03 +0100448static int __devinit acpi_pci_root_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449{
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600450 unsigned long long segment, bus;
451 acpi_status status;
452 int result;
453 struct acpi_pci_root *root;
454 acpi_handle handle;
Rui Zhang2786f6e2006-12-21 02:21:13 -0500455 struct acpi_device *child;
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700456 u32 flags, base_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700458 root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
459 if (!root)
460 return -ENOMEM;
461
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600462 segment = 0;
463 status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
464 &segment);
465 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
466 printk(KERN_ERR PREFIX "can't evaluate _SEG\n");
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700467 result = -ENODEV;
468 goto end;
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600469 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600471 /* Check _CRS first, then _BBN. If no _BBN, default to zero. */
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700472 root->secondary.flags = IORESOURCE_BUS;
473 status = try_get_root_bridge_busnr(device->handle, &root->secondary);
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600474 if (ACPI_FAILURE(status)) {
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700475 /*
476 * We need both the start and end of the downstream bus range
477 * to interpret _CBA (MMCONFIG base address), so it really is
478 * supposed to be in _CRS. If we don't find it there, all we
479 * can do is assume [_BBN-0xFF] or [0-0xFF].
480 */
481 root->secondary.end = 0xFF;
482 printk(KERN_WARNING FW_BUG PREFIX
483 "no secondary bus range in _CRS\n");
Jon Masone545b552011-06-19 18:51:37 -0500484 status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN,
485 NULL, &bus);
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700486 if (ACPI_SUCCESS(status))
487 root->secondary.start = bus;
488 else if (status == AE_NOT_FOUND)
489 root->secondary.start = 0;
490 else {
491 printk(KERN_ERR PREFIX "can't evaluate _BBN\n");
492 result = -ENODEV;
493 goto end;
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600494 }
495 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600497 INIT_LIST_HEAD(&root->node);
Patrick Mochel32917e52006-05-19 16:54:39 -0400498 root->device = device;
Bjorn Helgaas07054952009-06-18 14:47:07 -0600499 root->segment = segment & 0xFFFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
501 strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700502 device->driver_data = root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503
Jiang Liuf4b57a32012-06-22 14:55:16 +0800504 root->mcfg_addr = acpi_pci_root_get_mcfg_addr(device->handle);
505
Andrew Patterson990a7ac2008-11-10 15:30:45 -0700506 /*
507 * All supported architectures that use ACPI have support for
508 * PCI domains, so we indicate this in _OSC support capabilities.
509 */
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700510 flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900511 acpi_pci_osc_support(root, flags);
Andrew Patterson990a7ac2008-11-10 15:30:45 -0700512
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 /*
514 * TBD: Need PCI interface for enumeration/configuration of roots.
515 */
516
Taku Izumi6507e6e2012-09-18 15:24:40 +0900517 mutex_lock(&acpi_pci_root_lock);
Len Brown4be44fc2005-08-05 00:44:28 -0400518 list_add_tail(&root->node, &acpi_pci_roots);
Taku Izumi6507e6e2012-09-18 15:24:40 +0900519 mutex_unlock(&acpi_pci_root_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700521 printk(KERN_INFO PREFIX "%s [%s] (domain %04x %pR)\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400522 acpi_device_name(device), acpi_device_bid(device),
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700523 root->segment, &root->secondary);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524
525 /*
526 * Scan the Root Bridge
527 * --------------------
528 * Must do this prior to any attempt to bind the root device, as the
529 * PCI namespace does not get created until this call is made (and
530 * thus the root bridge's pci_dev does not exist).
531 */
Bjorn Helgaas57283772010-03-11 12:20:11 -0700532 root->bus = pci_acpi_scan_root(root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 if (!root->bus) {
Len Brown64684632006-06-26 23:41:38 -0400534 printk(KERN_ERR PREFIX
535 "Bus %04x:%02x not present in PCI namespace\n",
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700536 root->segment, (unsigned int)root->secondary.start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 result = -ENODEV;
Taku Izumi6507e6e2012-09-18 15:24:40 +0900538 goto out_del_root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 }
540
541 /*
542 * Attach ACPI-PCI Context
543 * -----------------------
544 * Thus binding the ACPI and PCI devices.
545 */
Alexander Chiang499650d2009-06-10 19:55:30 +0000546 result = acpi_pci_bind_root(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 if (result)
Taku Izumi6507e6e2012-09-18 15:24:40 +0900548 goto out_del_root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549
550 /*
551 * PCI Routing Table
552 * -----------------
553 * Evaluate and parse _PRT, if exists.
554 */
Patrick Mochel2d1e0a02006-05-19 16:54:43 -0400555 status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 if (ACPI_SUCCESS(status))
Alexander Chiang859a3f82009-06-10 19:55:35 +0000557 result = acpi_pci_irq_add_prt(device->handle, root->bus);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
Rui Zhang2786f6e2006-12-21 02:21:13 -0500559 /*
560 * Scan and bind all _ADR-Based Devices
561 */
562 list_for_each_entry(child, &device->children, node)
563 acpi_pci_bridge_scan(child);
564
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700565 /* Indicate support for various _OSC capabilities. */
566 if (pci_ext_cfg_avail(root->bus->self))
567 flags |= OSC_EXT_PCI_CONFIG_SUPPORT;
Rafael J. Wysocki8b8bae92011-03-05 13:21:51 +0100568 if (pcie_aspm_support_enabled())
Andrew Patterson3e1b1602008-11-10 15:30:55 -0700569 flags |= OSC_ACTIVE_STATE_PWR_SUPPORT |
570 OSC_CLOCK_PWR_CAPABILITY_SUPPORT;
Andrew Patterson07ae95f2008-11-10 15:31:05 -0700571 if (pci_msi_enabled())
572 flags |= OSC_MSI_SUPPORT;
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700573 if (flags != base_flags)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900574 acpi_pci_osc_support(root, flags);
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700575
Rafael J. Wysocki415e12b2011-01-07 00:55:09 +0100576 if (!pcie_ports_disabled
577 && (flags & ACPI_PCIE_REQ_SUPPORT) == ACPI_PCIE_REQ_SUPPORT) {
578 flags = OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL
579 | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL
580 | OSC_PCI_EXPRESS_PME_CONTROL;
581
582 if (pci_aer_available()) {
583 if (aer_acpi_firmware_first())
584 dev_dbg(root->bus->bridge,
585 "PCIe errors handled by BIOS.\n");
586 else
587 flags |= OSC_PCI_EXPRESS_AER_CONTROL;
588 }
589
590 dev_info(root->bus->bridge,
591 "Requesting ACPI _OSC control (0x%02x)\n", flags);
592
593 status = acpi_pci_osc_control_set(device->handle, &flags,
594 OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
Naga Chumbalkareca67312011-03-21 03:29:20 +0000595 if (ACPI_SUCCESS(status)) {
Rafael J. Wysocki415e12b2011-01-07 00:55:09 +0100596 dev_info(root->bus->bridge,
597 "ACPI _OSC control (0x%02x) granted\n", flags);
Matthew Garrett3c076352011-11-10 16:38:33 -0500598 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
599 /*
600 * We have ASPM control, but the FADT indicates
601 * that it's unsupported. Clear it.
602 */
603 pcie_clear_aspm(root->bus);
604 }
Naga Chumbalkareca67312011-03-21 03:29:20 +0000605 } else {
Rafael J. Wysockia2466702011-04-30 00:21:38 +0200606 dev_info(root->bus->bridge,
607 "ACPI _OSC request failed (%s), "
608 "returned control mask: 0x%02x\n",
609 acpi_format_exception(status), flags);
610 pr_info("ACPI _OSC control for PCIe not granted, "
611 "disabling ASPM\n");
Naga Chumbalkareca67312011-03-21 03:29:20 +0000612 pcie_no_aspm();
613 }
Rafael J. Wysockia2466702011-04-30 00:21:38 +0200614 } else {
615 dev_info(root->bus->bridge,
616 "Unable to request _OSC control "
617 "(_OSC support mask: 0x%02x)\n", flags);
Rafael J. Wysocki415e12b2011-01-07 00:55:09 +0100618 }
619
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100620 pci_acpi_add_bus_pm_notifier(device, root->bus);
621 if (device->wakeup.flags.run_wake)
622 device_set_run_wake(root->bus->bridge, true);
623
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600624 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625
Taku Izumi6507e6e2012-09-18 15:24:40 +0900626out_del_root:
627 mutex_lock(&acpi_pci_root_lock);
628 list_del(&root->node);
629 mutex_unlock(&acpi_pci_root_lock);
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600630end:
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600631 kfree(root);
Patrick Mocheld550d982006-06-27 00:41:40 -0400632 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633}
634
Len Brown4be44fc2005-08-05 00:44:28 -0400635static int acpi_pci_root_start(struct acpi_device *device)
Rajesh Shahc431ada2005-04-28 00:25:45 -0700636{
Bjorn Helgaascaf420c2009-06-18 14:46:57 -0600637 struct acpi_pci_root *root = acpi_driver_data(device);
Jiang Liuc8e9afb2012-09-18 15:20:34 +0900638 struct acpi_pci_driver *driver;
639
Taku Izumid0020f62012-09-18 15:21:31 +0900640 mutex_lock(&acpi_pci_root_lock);
Jiang Liuc8e9afb2012-09-18 15:20:34 +0900641 list_for_each_entry(driver, &acpi_pci_drivers, node)
642 if (driver->add)
Taku Izumi55bfe3c2012-09-18 15:22:35 +0900643 driver->add(root);
Taku Izumid0020f62012-09-18 15:21:31 +0900644 mutex_unlock(&acpi_pci_root_lock);
Rajesh Shahc431ada2005-04-28 00:25:45 -0700645
Bjorn Helgaascaf420c2009-06-18 14:46:57 -0600646 pci_bus_add_devices(root->bus);
Jiang Liuc8e9afb2012-09-18 15:20:34 +0900647
Bjorn Helgaascaf420c2009-06-18 14:46:57 -0600648 return 0;
Rajesh Shahc431ada2005-04-28 00:25:45 -0700649}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650
Len Brown4be44fc2005-08-05 00:44:28 -0400651static int acpi_pci_root_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652{
Bjorn Helgaascaf420c2009-06-18 14:46:57 -0600653 struct acpi_pci_root *root = acpi_driver_data(device);
Jiang Liuc8e9afb2012-09-18 15:20:34 +0900654 struct acpi_pci_driver *driver;
655
Taku Izumid0020f62012-09-18 15:21:31 +0900656 mutex_lock(&acpi_pci_root_lock);
Jiang Liuc8e9afb2012-09-18 15:20:34 +0900657 list_for_each_entry(driver, &acpi_pci_drivers, node)
658 if (driver->remove)
Taku Izumi55bfe3c2012-09-18 15:22:35 +0900659 driver->remove(root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100661 device_set_run_wake(root->bus->bridge, false);
662 pci_acpi_remove_bus_pm_notifier(device);
663
Taku Izumi6507e6e2012-09-18 15:24:40 +0900664 list_del(&root->node);
665 mutex_unlock(&acpi_pci_root_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 kfree(root);
Patrick Mocheld550d982006-06-27 00:41:40 -0400667 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668}
669
Len Brown4be44fc2005-08-05 00:44:28 -0400670static int __init acpi_pci_root_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671{
Rafael J. Wysockid3072e62011-01-16 20:44:22 +0100672 acpi_hest_init();
673
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 if (acpi_pci_disabled)
Patrick Mocheld550d982006-06-27 00:41:40 -0400675 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676
Bjorn Helgaas7bc5e3f2010-02-23 10:24:41 -0700677 pci_acpi_crs_quirks();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
Patrick Mocheld550d982006-06-27 00:41:40 -0400679 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680
Patrick Mocheld550d982006-06-27 00:41:40 -0400681 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682}
683
684subsys_initcall(acpi_pci_root_init);