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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"
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;
Neil Horman3dc48af2013-08-29 16:17:05 -0400381 bool no_aspm = false, clear_aspm = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700383 root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
384 if (!root)
385 return -ENOMEM;
386
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600387 segment = 0;
Jiang Liubfe24142013-05-28 18:31:27 -0600388 status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL,
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600389 &segment);
390 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
Jiang Liu6dc7d222013-05-28 18:10:05 -0600391 dev_err(&device->dev, "can't evaluate _SEG\n");
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700392 result = -ENODEV;
393 goto end;
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600394 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600396 /* Check _CRS first, then _BBN. If no _BBN, default to zero. */
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700397 root->secondary.flags = IORESOURCE_BUS;
Jiang Liubfe24142013-05-28 18:31:27 -0600398 status = try_get_root_bridge_busnr(handle, &root->secondary);
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600399 if (ACPI_FAILURE(status)) {
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700400 /*
401 * We need both the start and end of the downstream bus range
402 * to interpret _CBA (MMCONFIG base address), so it really is
403 * supposed to be in _CRS. If we don't find it there, all we
404 * can do is assume [_BBN-0xFF] or [0-0xFF].
405 */
406 root->secondary.end = 0xFF;
Jiang Liu6dc7d222013-05-28 18:10:05 -0600407 dev_warn(&device->dev,
408 FW_BUG "no secondary bus range in _CRS\n");
Jiang Liubfe24142013-05-28 18:31:27 -0600409 status = acpi_evaluate_integer(handle, METHOD_NAME__BBN,
Jon Masone545b552011-06-19 18:51:37 -0500410 NULL, &bus);
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700411 if (ACPI_SUCCESS(status))
412 root->secondary.start = bus;
413 else if (status == AE_NOT_FOUND)
414 root->secondary.start = 0;
415 else {
Jiang Liu6dc7d222013-05-28 18:10:05 -0600416 dev_err(&device->dev, "can't evaluate _BBN\n");
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700417 result = -ENODEV;
418 goto end;
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600419 }
420 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421
Patrick Mochel32917e52006-05-19 16:54:39 -0400422 root->device = device;
Bjorn Helgaas07054952009-06-18 14:47:07 -0600423 root->segment = segment & 0xFFFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
425 strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700426 device->driver_data = root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
Jiang Liu6dc7d222013-05-28 18:10:05 -0600428 pr_info(PREFIX "%s [%s] (domain %04x %pR)\n",
Bjorn Helgaasd4761ba2012-10-30 15:24:50 +0900429 acpi_device_name(device), acpi_device_bid(device),
430 root->segment, &root->secondary);
431
Jiang Liubfe24142013-05-28 18:31:27 -0600432 root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle);
Jiang Liuf4b57a32012-06-22 14:55:16 +0800433
Andrew Patterson990a7ac2008-11-10 15:30:45 -0700434 /*
435 * All supported architectures that use ACPI have support for
436 * PCI domains, so we indicate this in _OSC support capabilities.
437 */
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700438 flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900439 acpi_pci_osc_support(root, flags);
Andrew Patterson990a7ac2008-11-10 15:30:45 -0700440
Taku Izumi8c33f512012-10-30 15:27:13 +0900441 if (pci_ext_cfg_avail())
442 flags |= OSC_EXT_PCI_CONFIG_SUPPORT;
443 if (pcie_aspm_support_enabled()) {
444 flags |= OSC_ACTIVE_STATE_PWR_SUPPORT |
445 OSC_CLOCK_PWR_CAPABILITY_SUPPORT;
446 }
447 if (pci_msi_enabled())
448 flags |= OSC_MSI_SUPPORT;
449 if (flags != base_flags) {
450 status = acpi_pci_osc_support(root, flags);
451 if (ACPI_FAILURE(status)) {
452 dev_info(&device->dev, "ACPI _OSC support "
453 "notification failed, disabling PCIe ASPM\n");
Neil Horman3dc48af2013-08-29 16:17:05 -0400454 no_aspm = true;
Taku Izumi8c33f512012-10-30 15:27:13 +0900455 flags = base_flags;
456 }
457 }
Bjorn Helgaasb8178f12013-04-01 15:47:39 -0600458
Taku Izumi8c33f512012-10-30 15:27:13 +0900459 if (!pcie_ports_disabled
460 && (flags & ACPI_PCIE_REQ_SUPPORT) == ACPI_PCIE_REQ_SUPPORT) {
461 flags = OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL
462 | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL
463 | OSC_PCI_EXPRESS_PME_CONTROL;
464
465 if (pci_aer_available()) {
466 if (aer_acpi_firmware_first())
467 dev_dbg(&device->dev,
468 "PCIe errors handled by BIOS.\n");
469 else
470 flags |= OSC_PCI_EXPRESS_AER_CONTROL;
471 }
472
473 dev_info(&device->dev,
474 "Requesting ACPI _OSC control (0x%02x)\n", flags);
475
Jiang Liubfe24142013-05-28 18:31:27 -0600476 status = acpi_pci_osc_control_set(handle, &flags,
Taku Izumi8c33f512012-10-30 15:27:13 +0900477 OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
478 if (ACPI_SUCCESS(status)) {
Taku Izumi8c33f512012-10-30 15:27:13 +0900479 dev_info(&device->dev,
480 "ACPI _OSC control (0x%02x) granted\n", flags);
Bjorn Helgaasb8178f12013-04-01 15:47:39 -0600481 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
482 /*
483 * We have ASPM control, but the FADT indicates
484 * that it's unsupported. Clear it.
485 */
Neil Horman3dc48af2013-08-29 16:17:05 -0400486 clear_aspm = true;
Bjorn Helgaasb8178f12013-04-01 15:47:39 -0600487 }
Taku Izumi8c33f512012-10-30 15:27:13 +0900488 } else {
Taku Izumi8c33f512012-10-30 15:27:13 +0900489 dev_info(&device->dev,
490 "ACPI _OSC request failed (%s), "
491 "returned control mask: 0x%02x\n",
492 acpi_format_exception(status), flags);
Jiang Liu6dc7d222013-05-28 18:10:05 -0600493 dev_info(&device->dev,
494 "ACPI _OSC control for PCIe not granted, disabling ASPM\n");
Neil Horman3dc48af2013-08-29 16:17:05 -0400495 /*
496 * We want to disable ASPM here, but aspm_disabled
497 * needs to remain in its state from boot so that we
498 * properly handle PCIe 1.1 devices. So we set this
499 * flag here, to defer the action until after the ACPI
500 * root scan.
501 */
502 no_aspm = true;
Taku Izumi8c33f512012-10-30 15:27:13 +0900503 }
504 } else {
505 dev_info(&device->dev,
Bjorn Helgaasb8178f12013-04-01 15:47:39 -0600506 "Unable to request _OSC control "
507 "(_OSC support mask: 0x%02x)\n", flags);
Rafael J. Wysocki415e12b2011-01-07 00:55:09 +0100508 }
509
Neil Horman3dc48af2013-08-29 16:17:05 -0400510 /*
511 * TBD: Need PCI interface for enumeration/configuration of roots.
512 */
513
514 /*
515 * Scan the Root Bridge
516 * --------------------
517 * Must do this prior to any attempt to bind the root device, as the
518 * PCI namespace does not get created until this call is made (and
519 * thus the root bridge's pci_dev does not exist).
520 */
521 root->bus = pci_acpi_scan_root(root);
522 if (!root->bus) {
523 dev_err(&device->dev,
524 "Bus %04x:%02x not present in PCI namespace\n",
525 root->segment, (unsigned int)root->secondary.start);
526 result = -ENODEV;
527 goto end;
528 }
529
530 if (clear_aspm) {
531 dev_info(&device->dev, "Disabling ASPM (FADT indicates it is unsupported)\n");
532 pcie_clear_aspm(root->bus);
533 }
534 if (no_aspm)
535 pcie_no_aspm();
536
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100537 pci_acpi_add_bus_pm_notifier(device, root->bus);
538 if (device->wakeup.flags.run_wake)
539 device_set_run_wake(root->bus->bridge, true);
540
Yinghai Lu3c449ed2012-11-03 21:39:31 -0700541 if (system_state != SYSTEM_BOOTING) {
542 pcibios_resource_survey_bus(root->bus);
Yinghai Lu62a08c52012-10-30 14:31:32 -0600543 pci_assign_unassigned_bus_resources(root->bus);
544
Jiang Liu516ca222013-05-28 18:04:46 -0600545 /* need to after hot-added ioapic is registered */
Yinghai Lu62a08c52012-10-30 14:31:32 -0600546 pci_enable_bridges(root->bus);
Jiang Liu516ca222013-05-28 18:04:46 -0600547 }
Yinghai Lu62a08c52012-10-30 14:31:32 -0600548
Bjorn Helgaascaf420c2009-06-18 14:46:57 -0600549 pci_bus_add_devices(root->bus);
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +0100550 return 1;
Rafael J. Wysocki47525cd2012-12-21 00:36:45 +0100551
Rafael J. Wysocki47525cd2012-12-21 00:36:45 +0100552end:
553 kfree(root);
554 return result;
Rajesh Shahc431ada2005-04-28 00:25:45 -0700555}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +0100557static void acpi_pci_root_remove(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558{
Bjorn Helgaascaf420c2009-06-18 14:46:57 -0600559 struct acpi_pci_root *root = acpi_driver_data(device);
Jiang Liuc8e9afb2012-09-18 15:20:34 +0900560
Yinghai Lu9738a1f2012-10-30 14:31:43 -0600561 pci_stop_root_bus(root->bus);
562
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100563 device_set_run_wake(root->bus->bridge, false);
564 pci_acpi_remove_bus_pm_notifier(device);
565
Yinghai Lu9738a1f2012-10-30 14:31:43 -0600566 pci_remove_root_bus(root->bus);
567
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 kfree(root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569}
570
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +0100571void __init acpi_pci_root_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572{
Rafael J. Wysockid3072e62011-01-16 20:44:22 +0100573 acpi_hest_init();
574
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +0100575 if (!acpi_pci_disabled) {
576 pci_acpi_crs_quirks();
577 acpi_scan_add_handler(&pci_root_handler);
578 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579}
Yinghai Lu668192b2013-01-21 13:20:48 -0800580/* Support root bridge hotplug */
581
582static void handle_root_bridge_insertion(acpi_handle handle)
583{
584 struct acpi_device *device;
585
586 if (!acpi_bus_get_device(handle, &device)) {
Jiang Liu6dc7d222013-05-28 18:10:05 -0600587 dev_printk(KERN_DEBUG, &device->dev,
588 "acpi device already exists; ignoring notify\n");
Yinghai Lu668192b2013-01-21 13:20:48 -0800589 return;
590 }
591
592 if (acpi_bus_scan(handle))
Jiang Liu6dc7d222013-05-28 18:10:05 -0600593 acpi_handle_err(handle, "cannot add bridge to acpi list\n");
Yinghai Lu668192b2013-01-21 13:20:48 -0800594}
595
596static void handle_root_bridge_removal(struct acpi_device *device)
597{
Yinghai Lub8b66112013-03-11 05:05:16 +0000598 acpi_status status;
Yinghai Lu668192b2013-01-21 13:20:48 -0800599 struct acpi_eject_event *ej_event;
600
601 ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
602 if (!ej_event) {
603 /* Inform firmware the hot-remove operation has error */
604 (void) acpi_evaluate_hotplug_ost(device->handle,
605 ACPI_NOTIFY_EJECT_REQUEST,
606 ACPI_OST_SC_NON_SPECIFIC_FAILURE,
607 NULL);
608 return;
609 }
610
611 ej_event->device = device;
612 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
613
Yinghai Lub8b66112013-03-11 05:05:16 +0000614 status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
615 if (ACPI_FAILURE(status))
616 kfree(ej_event);
Yinghai Lu668192b2013-01-21 13:20:48 -0800617}
618
619static void _handle_hotplug_event_root(struct work_struct *work)
620{
621 struct acpi_pci_root *root;
Yinghai Lu668192b2013-01-21 13:20:48 -0800622 struct acpi_hp_work *hp_work;
623 acpi_handle handle;
624 u32 type;
625
626 hp_work = container_of(work, struct acpi_hp_work, work);
627 handle = hp_work->handle;
628 type = hp_work->type;
629
Yinghai Lub8b66112013-03-11 05:05:16 +0000630 acpi_scan_lock_acquire();
Yinghai Lu668192b2013-01-21 13:20:48 -0800631
Yinghai Lub8b66112013-03-11 05:05:16 +0000632 root = acpi_pci_find_root(handle);
Yinghai Lu668192b2013-01-21 13:20:48 -0800633
634 switch (type) {
635 case ACPI_NOTIFY_BUS_CHECK:
636 /* bus enumerate */
Jiang Liu6dc7d222013-05-28 18:10:05 -0600637 acpi_handle_printk(KERN_DEBUG, handle,
638 "Bus check notify on %s\n", __func__);
Yinghai Lu3f327e32013-05-07 11:06:03 -0600639 if (root)
640 acpiphp_check_host_bridge(handle);
641 else
Yinghai Lu668192b2013-01-21 13:20:48 -0800642 handle_root_bridge_insertion(handle);
643
644 break;
645
646 case ACPI_NOTIFY_DEVICE_CHECK:
647 /* device check */
Jiang Liu6dc7d222013-05-28 18:10:05 -0600648 acpi_handle_printk(KERN_DEBUG, handle,
649 "Device check notify on %s\n", __func__);
Yinghai Lu668192b2013-01-21 13:20:48 -0800650 if (!root)
651 handle_root_bridge_insertion(handle);
652 break;
653
654 case ACPI_NOTIFY_EJECT_REQUEST:
655 /* request device eject */
Jiang Liu6dc7d222013-05-28 18:10:05 -0600656 acpi_handle_printk(KERN_DEBUG, handle,
657 "Device eject notify on %s\n", __func__);
Yinghai Lu668192b2013-01-21 13:20:48 -0800658 if (root)
659 handle_root_bridge_removal(root->device);
660 break;
661 default:
Jiang Liu6dc7d222013-05-28 18:10:05 -0600662 acpi_handle_warn(handle,
663 "notify_handler: unknown event type 0x%x\n",
664 type);
Yinghai Lu668192b2013-01-21 13:20:48 -0800665 break;
666 }
667
Yinghai Lub8b66112013-03-11 05:05:16 +0000668 acpi_scan_lock_release();
Yinghai Lu668192b2013-01-21 13:20:48 -0800669 kfree(hp_work); /* allocated in handle_hotplug_event_bridge */
Yinghai Lu668192b2013-01-21 13:20:48 -0800670}
671
672static void handle_hotplug_event_root(acpi_handle handle, u32 type,
673 void *context)
674{
675 alloc_acpi_hp_work(handle, type, context,
676 _handle_hotplug_event_root);
677}
678
679static acpi_status __init
680find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
681{
Tang Chen121b0902013-01-21 13:20:49 -0800682 acpi_status status;
Yinghai Lu668192b2013-01-21 13:20:48 -0800683 int *count = (int *)context;
684
685 if (!acpi_is_root_bridge(handle))
686 return AE_OK;
687
688 (*count)++;
689
Tang Chen121b0902013-01-21 13:20:49 -0800690 status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
691 handle_hotplug_event_root, NULL);
692 if (ACPI_FAILURE(status))
Jiang Liu6dc7d222013-05-28 18:10:05 -0600693 acpi_handle_printk(KERN_DEBUG, handle,
694 "notify handler is not installed, exit status: %u\n",
695 (unsigned int)status);
Tang Chen121b0902013-01-21 13:20:49 -0800696 else
Jiang Liu6dc7d222013-05-28 18:10:05 -0600697 acpi_handle_printk(KERN_DEBUG, handle,
698 "notify handler is installed\n");
Yinghai Lu668192b2013-01-21 13:20:48 -0800699
700 return AE_OK;
701}
702
703void __init acpi_pci_root_hp_init(void)
704{
705 int num = 0;
706
707 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
708 ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL);
709
710 printk(KERN_DEBUG "Found %d acpi root devices\n", num);
711}