blob: 5917839321b8bb01254f57e0cde630f637ff76b2 [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
Kenji Kaneshige63f10f02009-02-09 15:59:29 +090068static DEFINE_MUTEX(osc_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
Alexander Chiang27558202009-06-10 19:55:14 +000070/**
71 * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
72 * @handle - the ACPI CA node in question.
73 *
74 * Note: we could make this API take a struct acpi_device * instead, but
75 * for now, it's more convenient to operate on an acpi_handle.
76 */
77int acpi_is_root_bridge(acpi_handle handle)
78{
79 int ret;
80 struct acpi_device *device;
81
82 ret = acpi_bus_get_device(handle, &device);
83 if (ret)
84 return 0;
85
86 ret = acpi_match_device_ids(device, root_device_ids);
87 if (ret)
88 return 0;
89 else
90 return 1;
91}
92EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
93
Linus Torvalds1da177e2005-04-16 15:20:36 -070094static acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -040095get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -070096{
Bjorn Helgaas6ad95512010-03-11 12:20:06 -070097 struct resource *res = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 struct acpi_resource_address64 address;
Bjorn Helgaasf6c1c8f2012-06-21 23:48:50 -060099 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
Bjorn Helgaasf6c1c8f2012-06-21 23:48:50 -0600101 status = acpi_resource_to_address64(resource, &address);
102 if (ACPI_FAILURE(status))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 return AE_OK;
104
Len Brown4be44fc2005-08-05 00:44:28 -0400105 if ((address.address_length > 0) &&
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700106 (address.resource_type == ACPI_BUS_NUMBER_RANGE)) {
107 res->start = address.minimum;
108 res->end = address.minimum + address.address_length - 1;
109 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
111 return AE_OK;
112}
113
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600114static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700115 struct resource *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116{
117 acpi_status status;
118
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700119 res->start = -1;
Len Brown4be44fc2005-08-05 00:44:28 -0400120 status =
121 acpi_walk_resources(handle, METHOD_NAME__CRS,
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700122 get_root_bridge_busnr_callback, res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 if (ACPI_FAILURE(status))
124 return status;
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700125 if (res->start == -1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 return AE_ERROR;
127 return AE_OK;
128}
129
Shaohua Li3a9622d2009-10-29 11:04:50 +0800130static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766";
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900131
132static acpi_status acpi_pci_run_osc(acpi_handle handle,
133 const u32 *capbuf, u32 *retval)
134{
Shaohua Li3a9622d2009-10-29 11:04:50 +0800135 struct acpi_osc_context context = {
136 .uuid_str = pci_osc_uuid_str,
137 .rev = 1,
138 .cap.length = 12,
139 .cap.pointer = (void *)capbuf,
140 };
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900141 acpi_status status;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900142
Shaohua Li3a9622d2009-10-29 11:04:50 +0800143 status = acpi_run_osc(handle, &context);
144 if (ACPI_SUCCESS(status)) {
145 *retval = *((u32 *)(context.ret.pointer + 8));
146 kfree(context.ret.pointer);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900147 }
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900148 return status;
149}
150
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200151static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root,
152 u32 support,
153 u32 *control)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900154{
155 acpi_status status;
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200156 u32 result, capbuf[3];
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900157
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200158 support &= OSC_PCI_SUPPORT_MASKS;
159 support |= root->osc_support_set;
160
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900161 capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200162 capbuf[OSC_SUPPORT_TYPE] = support;
163 if (control) {
164 *control &= OSC_PCI_CONTROL_MASKS;
165 capbuf[OSC_CONTROL_TYPE] = *control | root->osc_control_set;
166 } else {
Yinghai Lu545d6e12013-03-28 04:28:58 +0000167 /* Run _OSC query only with existing controls. */
168 capbuf[OSC_CONTROL_TYPE] = root->osc_control_set;
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200169 }
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900170
171 status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
172 if (ACPI_SUCCESS(status)) {
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200173 root->osc_support_set = support;
Rafael J. Wysocki2b8fd912010-08-23 23:55:59 +0200174 if (control)
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200175 *control = result;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900176 }
177 return status;
178}
179
180static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
181{
182 acpi_status status;
183 acpi_handle tmp;
184
185 status = acpi_get_handle(root->device->handle, "_OSC", &tmp);
186 if (ACPI_FAILURE(status))
187 return status;
188 mutex_lock(&osc_lock);
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200189 status = acpi_pci_query_osc(root, flags, NULL);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900190 mutex_unlock(&osc_lock);
191 return status;
192}
193
Alex Chiang76d56de2009-07-23 17:03:00 -0600194struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900195{
196 struct acpi_pci_root *root;
Taku Izumicd4faf92012-09-18 15:23:23 +0900197 struct acpi_device *device;
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600198
Taku Izumicd4faf92012-09-18 15:23:23 +0900199 if (acpi_bus_get_device(handle, &device) ||
200 acpi_match_device_ids(device, root_device_ids))
201 return NULL;
202
203 root = acpi_driver_data(device);
204
205 return root;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900206}
Alex Chiang76d56de2009-07-23 17:03:00 -0600207EXPORT_SYMBOL_GPL(acpi_pci_find_root);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900208
Alexander Chiang2f7bbce2009-06-10 19:55:20 +0000209struct acpi_handle_node {
210 struct list_head node;
211 acpi_handle handle;
212};
213
214/**
215 * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev
216 * @handle: the handle in question
217 *
218 * Given an ACPI CA handle, the desired PCI device is located in the
219 * list of PCI devices.
220 *
221 * If the device is found, its reference count is increased and this
222 * function returns a pointer to its data structure. The caller must
223 * decrement the reference count by calling pci_dev_put().
224 * If no device is found, %NULL is returned.
225 */
226struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
227{
228 int dev, fn;
229 unsigned long long adr;
230 acpi_status status;
231 acpi_handle phandle;
232 struct pci_bus *pbus;
233 struct pci_dev *pdev = NULL;
234 struct acpi_handle_node *node, *tmp;
235 struct acpi_pci_root *root;
236 LIST_HEAD(device_list);
237
238 /*
239 * Walk up the ACPI CA namespace until we reach a PCI root bridge.
240 */
241 phandle = handle;
242 while (!acpi_is_root_bridge(phandle)) {
243 node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL);
244 if (!node)
245 goto out;
246
247 INIT_LIST_HEAD(&node->node);
248 node->handle = phandle;
249 list_add(&node->node, &device_list);
250
251 status = acpi_get_parent(phandle, &phandle);
252 if (ACPI_FAILURE(status))
253 goto out;
254 }
255
256 root = acpi_pci_find_root(phandle);
257 if (!root)
258 goto out;
259
260 pbus = root->bus;
261
262 /*
263 * Now, walk back down the PCI device tree until we return to our
264 * original handle. Assumes that everything between the PCI root
265 * bridge and the device we're looking for must be a P2P bridge.
266 */
267 list_for_each_entry(node, &device_list, node) {
268 acpi_handle hnd = node->handle;
269 status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr);
270 if (ACPI_FAILURE(status))
271 goto out;
272 dev = (adr >> 16) & 0xffff;
273 fn = adr & 0xffff;
274
275 pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn));
Troy Moure412af972009-06-25 17:05:35 -0600276 if (!pdev || hnd == handle)
Alexander Chiang2f7bbce2009-06-10 19:55:20 +0000277 break;
278
279 pbus = pdev->subordinate;
280 pci_dev_put(pdev);
Rafael J. Wysocki497fb542009-10-13 01:01:57 +0200281
282 /*
283 * This function may be called for a non-PCI device that has a
284 * PCI parent (eg. a disk under a PCI SATA controller). In that
285 * case pdev->subordinate will be NULL for the parent.
286 */
287 if (!pbus) {
288 dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n");
289 pdev = NULL;
290 break;
291 }
Alexander Chiang2f7bbce2009-06-10 19:55:20 +0000292 }
293out:
294 list_for_each_entry_safe(node, tmp, &device_list, node)
295 kfree(node);
296
297 return pdev;
298}
299EXPORT_SYMBOL_GPL(acpi_get_pci_dev);
300
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900301/**
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200302 * acpi_pci_osc_control_set - Request control of PCI root _OSC features.
303 * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex).
304 * @mask: Mask of _OSC bits to request control of, place to store control mask.
305 * @req: Mask of _OSC bits the control of is essential to the caller.
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900306 *
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200307 * Run _OSC query for @mask and if that is successful, compare the returned
308 * mask of control bits with @req. If all of the @req bits are set in the
309 * returned mask, run _OSC request for it.
310 *
311 * The variable at the @mask address may be modified regardless of whether or
312 * not the function returns success. On success it will contain the mask of
313 * _OSC bits the BIOS has granted control of, but its contents are meaningless
314 * on failure.
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900315 **/
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200316acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900317{
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900318 struct acpi_pci_root *root;
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200319 acpi_status status;
320 u32 ctrl, capbuf[3];
321 acpi_handle tmp;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900322
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200323 if (!mask)
324 return AE_BAD_PARAMETER;
325
326 ctrl = *mask & OSC_PCI_CONTROL_MASKS;
327 if ((ctrl & req) != req)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900328 return AE_TYPE;
329
330 root = acpi_pci_find_root(handle);
331 if (!root)
332 return AE_NOT_EXIST;
333
Rafael J. Wysockib879dc42010-08-21 01:52:37 +0200334 status = acpi_get_handle(handle, "_OSC", &tmp);
335 if (ACPI_FAILURE(status))
336 return status;
337
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900338 mutex_lock(&osc_lock);
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200339
340 *mask = ctrl | root->osc_control_set;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900341 /* No need to evaluate _OSC if the control was already granted. */
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200342 if ((root->osc_control_set & ctrl) == ctrl)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900343 goto out;
344
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200345 /* Need to check the available controls bits before requesting them. */
346 while (*mask) {
347 status = acpi_pci_query_osc(root, root->osc_support_set, mask);
348 if (ACPI_FAILURE(status))
349 goto out;
350 if (ctrl == *mask)
351 break;
352 ctrl = *mask;
353 }
Rafael J. Wysocki2b8fd912010-08-23 23:55:59 +0200354
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200355 if ((ctrl & req) != req) {
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900356 status = AE_SUPPORT;
357 goto out;
358 }
359
360 capbuf[OSC_QUERY_TYPE] = 0;
361 capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set;
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200362 capbuf[OSC_CONTROL_TYPE] = ctrl;
363 status = acpi_pci_run_osc(handle, capbuf, mask);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900364 if (ACPI_SUCCESS(status))
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200365 root->osc_control_set = *mask;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900366out:
367 mutex_unlock(&osc_lock);
368 return status;
369}
Kenji Kaneshige9f5404d2009-02-09 16:00:04 +0900370EXPORT_SYMBOL(acpi_pci_osc_control_set);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900371
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +0100372static int acpi_pci_root_add(struct acpi_device *device,
373 const struct acpi_device_id *not_used)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374{
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600375 unsigned long long segment, bus;
376 acpi_status status;
377 int result;
378 struct acpi_pci_root *root;
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700379 u32 flags, base_flags;
Jiang Liubfe24142013-05-28 18:31:27 -0600380 acpi_handle handle = device->handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700382 root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
383 if (!root)
384 return -ENOMEM;
385
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600386 segment = 0;
Jiang Liubfe24142013-05-28 18:31:27 -0600387 status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL,
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600388 &segment);
389 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
Jiang Liu6dc7d222013-05-28 18:10:05 -0600390 dev_err(&device->dev, "can't evaluate _SEG\n");
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700391 result = -ENODEV;
392 goto end;
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600393 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600395 /* Check _CRS first, then _BBN. If no _BBN, default to zero. */
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700396 root->secondary.flags = IORESOURCE_BUS;
Jiang Liubfe24142013-05-28 18:31:27 -0600397 status = try_get_root_bridge_busnr(handle, &root->secondary);
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600398 if (ACPI_FAILURE(status)) {
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700399 /*
400 * We need both the start and end of the downstream bus range
401 * to interpret _CBA (MMCONFIG base address), so it really is
402 * supposed to be in _CRS. If we don't find it there, all we
403 * can do is assume [_BBN-0xFF] or [0-0xFF].
404 */
405 root->secondary.end = 0xFF;
Jiang Liu6dc7d222013-05-28 18:10:05 -0600406 dev_warn(&device->dev,
407 FW_BUG "no secondary bus range in _CRS\n");
Jiang Liubfe24142013-05-28 18:31:27 -0600408 status = acpi_evaluate_integer(handle, METHOD_NAME__BBN,
Jon Masone545b552011-06-19 18:51:37 -0500409 NULL, &bus);
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700410 if (ACPI_SUCCESS(status))
411 root->secondary.start = bus;
412 else if (status == AE_NOT_FOUND)
413 root->secondary.start = 0;
414 else {
Jiang Liu6dc7d222013-05-28 18:10:05 -0600415 dev_err(&device->dev, "can't evaluate _BBN\n");
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700416 result = -ENODEV;
417 goto end;
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600418 }
419 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420
Patrick Mochel32917e52006-05-19 16:54:39 -0400421 root->device = device;
Bjorn Helgaas07054952009-06-18 14:47:07 -0600422 root->segment = segment & 0xFFFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
424 strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700425 device->driver_data = root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426
Jiang Liu6dc7d222013-05-28 18:10:05 -0600427 pr_info(PREFIX "%s [%s] (domain %04x %pR)\n",
Bjorn Helgaasd4761ba2012-10-30 15:24:50 +0900428 acpi_device_name(device), acpi_device_bid(device),
429 root->segment, &root->secondary);
430
Jiang Liubfe24142013-05-28 18:31:27 -0600431 root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle);
Jiang Liuf4b57a32012-06-22 14:55:16 +0800432
Andrew Patterson990a7ac2008-11-10 15:30:45 -0700433 /*
434 * All supported architectures that use ACPI have support for
435 * PCI domains, so we indicate this in _OSC support capabilities.
436 */
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700437 flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900438 acpi_pci_osc_support(root, flags);
Andrew Patterson990a7ac2008-11-10 15:30:45 -0700439
Bjorn Helgaasb8178f12013-04-01 15:47:39 -0600440 /*
441 * TBD: Need PCI interface for enumeration/configuration of roots.
442 */
443
Bjorn Helgaasb8178f12013-04-01 15:47:39 -0600444 /*
445 * Scan the Root Bridge
446 * --------------------
447 * Must do this prior to any attempt to bind the root device, as the
448 * PCI namespace does not get created until this call is made (and
449 * thus the root bridge's pci_dev does not exist).
450 */
451 root->bus = pci_acpi_scan_root(root);
452 if (!root->bus) {
Jiang Liu6dc7d222013-05-28 18:10:05 -0600453 dev_err(&device->dev,
454 "Bus %04x:%02x not present in PCI namespace\n",
455 root->segment, (unsigned int)root->secondary.start);
Bjorn Helgaasb8178f12013-04-01 15:47:39 -0600456 result = -ENODEV;
Jiang Liubbebed62013-05-28 17:59:25 -0600457 goto end;
Bjorn Helgaasb8178f12013-04-01 15:47:39 -0600458 }
459
Taku Izumi8c33f512012-10-30 15:27:13 +0900460 /* Indicate support for various _OSC capabilities. */
461 if (pci_ext_cfg_avail())
462 flags |= OSC_EXT_PCI_CONFIG_SUPPORT;
463 if (pcie_aspm_support_enabled()) {
464 flags |= OSC_ACTIVE_STATE_PWR_SUPPORT |
465 OSC_CLOCK_PWR_CAPABILITY_SUPPORT;
466 }
467 if (pci_msi_enabled())
468 flags |= OSC_MSI_SUPPORT;
469 if (flags != base_flags) {
470 status = acpi_pci_osc_support(root, flags);
471 if (ACPI_FAILURE(status)) {
472 dev_info(&device->dev, "ACPI _OSC support "
473 "notification failed, disabling PCIe ASPM\n");
474 pcie_no_aspm();
475 flags = base_flags;
476 }
477 }
Bjorn Helgaasb8178f12013-04-01 15:47:39 -0600478
Taku Izumi8c33f512012-10-30 15:27:13 +0900479 if (!pcie_ports_disabled
480 && (flags & ACPI_PCIE_REQ_SUPPORT) == ACPI_PCIE_REQ_SUPPORT) {
481 flags = OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL
482 | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL
483 | OSC_PCI_EXPRESS_PME_CONTROL;
484
485 if (pci_aer_available()) {
486 if (aer_acpi_firmware_first())
487 dev_dbg(&device->dev,
488 "PCIe errors handled by BIOS.\n");
489 else
490 flags |= OSC_PCI_EXPRESS_AER_CONTROL;
491 }
492
493 dev_info(&device->dev,
494 "Requesting ACPI _OSC control (0x%02x)\n", flags);
495
Jiang Liubfe24142013-05-28 18:31:27 -0600496 status = acpi_pci_osc_control_set(handle, &flags,
Taku Izumi8c33f512012-10-30 15:27:13 +0900497 OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
498 if (ACPI_SUCCESS(status)) {
Taku Izumi8c33f512012-10-30 15:27:13 +0900499 dev_info(&device->dev,
500 "ACPI _OSC control (0x%02x) granted\n", flags);
Bjorn Helgaasb8178f12013-04-01 15:47:39 -0600501 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
502 /*
503 * We have ASPM control, but the FADT indicates
504 * that it's unsupported. Clear it.
505 */
506 pcie_clear_aspm(root->bus);
507 }
Taku Izumi8c33f512012-10-30 15:27:13 +0900508 } else {
Taku Izumi8c33f512012-10-30 15:27:13 +0900509 dev_info(&device->dev,
510 "ACPI _OSC request failed (%s), "
511 "returned control mask: 0x%02x\n",
512 acpi_format_exception(status), flags);
Jiang Liu6dc7d222013-05-28 18:10:05 -0600513 dev_info(&device->dev,
514 "ACPI _OSC control for PCIe not granted, disabling ASPM\n");
Bjorn Helgaasb8178f12013-04-01 15:47:39 -0600515 pcie_no_aspm();
Taku Izumi8c33f512012-10-30 15:27:13 +0900516 }
517 } else {
518 dev_info(&device->dev,
Bjorn Helgaasb8178f12013-04-01 15:47:39 -0600519 "Unable to request _OSC control "
520 "(_OSC support mask: 0x%02x)\n", flags);
Rafael J. Wysocki415e12b2011-01-07 00:55:09 +0100521 }
522
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100523 pci_acpi_add_bus_pm_notifier(device, root->bus);
524 if (device->wakeup.flags.run_wake)
525 device_set_run_wake(root->bus->bridge, true);
526
Yinghai Lu3c449ed2012-11-03 21:39:31 -0700527 if (system_state != SYSTEM_BOOTING) {
528 pcibios_resource_survey_bus(root->bus);
Yinghai Lu62a08c52012-10-30 14:31:32 -0600529 pci_assign_unassigned_bus_resources(root->bus);
530
Jiang Liu516ca222013-05-28 18:04:46 -0600531 /* need to after hot-added ioapic is registered */
Yinghai Lu62a08c52012-10-30 14:31:32 -0600532 pci_enable_bridges(root->bus);
Jiang Liu516ca222013-05-28 18:04:46 -0600533 }
Yinghai Lu62a08c52012-10-30 14:31:32 -0600534
Bjorn Helgaascaf420c2009-06-18 14:46:57 -0600535 pci_bus_add_devices(root->bus);
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +0100536 return 1;
Rafael J. Wysocki47525cd2012-12-21 00:36:45 +0100537
Rafael J. Wysocki47525cd2012-12-21 00:36:45 +0100538end:
539 kfree(root);
540 return result;
Rajesh Shahc431ada2005-04-28 00:25:45 -0700541}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +0100543static void acpi_pci_root_remove(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544{
Bjorn Helgaascaf420c2009-06-18 14:46:57 -0600545 struct acpi_pci_root *root = acpi_driver_data(device);
Jiang Liuc8e9afb2012-09-18 15:20:34 +0900546
Yinghai Lu9738a1f2012-10-30 14:31:43 -0600547 pci_stop_root_bus(root->bus);
548
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100549 device_set_run_wake(root->bus->bridge, false);
550 pci_acpi_remove_bus_pm_notifier(device);
551
Yinghai Lu9738a1f2012-10-30 14:31:43 -0600552 pci_remove_root_bus(root->bus);
553
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 kfree(root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555}
556
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +0100557void __init acpi_pci_root_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558{
Rafael J. Wysockid3072e62011-01-16 20:44:22 +0100559 acpi_hest_init();
560
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +0100561 if (!acpi_pci_disabled) {
562 pci_acpi_crs_quirks();
563 acpi_scan_add_handler(&pci_root_handler);
564 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565}
Yinghai Lu668192b2013-01-21 13:20:48 -0800566/* Support root bridge hotplug */
567
568static void handle_root_bridge_insertion(acpi_handle handle)
569{
570 struct acpi_device *device;
571
572 if (!acpi_bus_get_device(handle, &device)) {
Jiang Liu6dc7d222013-05-28 18:10:05 -0600573 dev_printk(KERN_DEBUG, &device->dev,
574 "acpi device already exists; ignoring notify\n");
Yinghai Lu668192b2013-01-21 13:20:48 -0800575 return;
576 }
577
578 if (acpi_bus_scan(handle))
Jiang Liu6dc7d222013-05-28 18:10:05 -0600579 acpi_handle_err(handle, "cannot add bridge to acpi list\n");
Yinghai Lu668192b2013-01-21 13:20:48 -0800580}
581
582static void handle_root_bridge_removal(struct acpi_device *device)
583{
Yinghai Lub8b66112013-03-11 05:05:16 +0000584 acpi_status status;
Yinghai Lu668192b2013-01-21 13:20:48 -0800585 struct acpi_eject_event *ej_event;
586
587 ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
588 if (!ej_event) {
589 /* Inform firmware the hot-remove operation has error */
590 (void) acpi_evaluate_hotplug_ost(device->handle,
591 ACPI_NOTIFY_EJECT_REQUEST,
592 ACPI_OST_SC_NON_SPECIFIC_FAILURE,
593 NULL);
594 return;
595 }
596
597 ej_event->device = device;
598 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
599
Yinghai Lub8b66112013-03-11 05:05:16 +0000600 status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
601 if (ACPI_FAILURE(status))
602 kfree(ej_event);
Yinghai Lu668192b2013-01-21 13:20:48 -0800603}
604
605static void _handle_hotplug_event_root(struct work_struct *work)
606{
607 struct acpi_pci_root *root;
Yinghai Lu668192b2013-01-21 13:20:48 -0800608 struct acpi_hp_work *hp_work;
609 acpi_handle handle;
610 u32 type;
611
612 hp_work = container_of(work, struct acpi_hp_work, work);
613 handle = hp_work->handle;
614 type = hp_work->type;
615
Yinghai Lub8b66112013-03-11 05:05:16 +0000616 acpi_scan_lock_acquire();
Yinghai Lu668192b2013-01-21 13:20:48 -0800617
Yinghai Lub8b66112013-03-11 05:05:16 +0000618 root = acpi_pci_find_root(handle);
Yinghai Lu668192b2013-01-21 13:20:48 -0800619
620 switch (type) {
621 case ACPI_NOTIFY_BUS_CHECK:
622 /* bus enumerate */
Jiang Liu6dc7d222013-05-28 18:10:05 -0600623 acpi_handle_printk(KERN_DEBUG, handle,
624 "Bus check notify on %s\n", __func__);
Yinghai Lu3f327e32013-05-07 11:06:03 -0600625 if (root)
626 acpiphp_check_host_bridge(handle);
627 else
Yinghai Lu668192b2013-01-21 13:20:48 -0800628 handle_root_bridge_insertion(handle);
629
630 break;
631
632 case ACPI_NOTIFY_DEVICE_CHECK:
633 /* device check */
Jiang Liu6dc7d222013-05-28 18:10:05 -0600634 acpi_handle_printk(KERN_DEBUG, handle,
635 "Device check notify on %s\n", __func__);
Yinghai Lu668192b2013-01-21 13:20:48 -0800636 if (!root)
637 handle_root_bridge_insertion(handle);
638 break;
639
640 case ACPI_NOTIFY_EJECT_REQUEST:
641 /* request device eject */
Jiang Liu6dc7d222013-05-28 18:10:05 -0600642 acpi_handle_printk(KERN_DEBUG, handle,
643 "Device eject notify on %s\n", __func__);
Yinghai Lu668192b2013-01-21 13:20:48 -0800644 if (root)
645 handle_root_bridge_removal(root->device);
646 break;
647 default:
Jiang Liu6dc7d222013-05-28 18:10:05 -0600648 acpi_handle_warn(handle,
649 "notify_handler: unknown event type 0x%x\n",
650 type);
Yinghai Lu668192b2013-01-21 13:20:48 -0800651 break;
652 }
653
Yinghai Lub8b66112013-03-11 05:05:16 +0000654 acpi_scan_lock_release();
Yinghai Lu668192b2013-01-21 13:20:48 -0800655 kfree(hp_work); /* allocated in handle_hotplug_event_bridge */
Yinghai Lu668192b2013-01-21 13:20:48 -0800656}
657
658static void handle_hotplug_event_root(acpi_handle handle, u32 type,
659 void *context)
660{
661 alloc_acpi_hp_work(handle, type, context,
662 _handle_hotplug_event_root);
663}
664
665static acpi_status __init
666find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
667{
Tang Chen121b0902013-01-21 13:20:49 -0800668 acpi_status status;
Yinghai Lu668192b2013-01-21 13:20:48 -0800669 int *count = (int *)context;
670
671 if (!acpi_is_root_bridge(handle))
672 return AE_OK;
673
674 (*count)++;
675
Tang Chen121b0902013-01-21 13:20:49 -0800676 status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
677 handle_hotplug_event_root, NULL);
678 if (ACPI_FAILURE(status))
Jiang Liu6dc7d222013-05-28 18:10:05 -0600679 acpi_handle_printk(KERN_DEBUG, handle,
680 "notify handler is not installed, exit status: %u\n",
681 (unsigned int)status);
Tang Chen121b0902013-01-21 13:20:49 -0800682 else
Jiang Liu6dc7d222013-05-28 18:10:05 -0600683 acpi_handle_printk(KERN_DEBUG, handle,
684 "notify handler is installed\n");
Yinghai Lu668192b2013-01-21 13:20:48 -0800685
686 return AE_OK;
687}
688
689void __init acpi_pci_root_hp_init(void)
690{
691 int num = 0;
692
693 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
694 ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL);
695
696 printk(KERN_DEBUG "Found %d acpi root devices\n", num);
697}