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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>
Lv Zheng8b484632013-12-03 08:49:16 +080038#include <acpi/apei.h> /* for acpi_hest_init() */
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
Rafael J. Wysockiace82382013-11-07 01:41:48 +010040#include "internal.h"
41
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#define _COMPONENT ACPI_PCI_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050043ACPI_MODULE_NAME("pci_root");
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#define ACPI_PCI_ROOT_CLASS "pci_bridge"
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge"
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +010046static int acpi_pci_root_add(struct acpi_device *device,
47 const struct acpi_device_id *not_used);
48static void acpi_pci_root_remove(struct acpi_device *device);
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
Rafael J. Wysocki3338db02013-11-22 21:55:20 +010050static int acpi_pci_root_scan_dependent(struct acpi_device *adev)
51{
Rafael J. Wysocki1f7c1642014-02-04 00:45:13 +010052 acpiphp_check_host_bridge(adev);
Rafael J. Wysocki3338db02013-11-22 21:55:20 +010053 return 0;
54}
55
Bjorn Helgaas7dab9ef2013-09-05 15:07:39 -060056#define ACPI_PCIE_REQ_SUPPORT (OSC_PCI_EXT_CONFIG_SUPPORT \
57 | OSC_PCI_ASPM_SUPPORT \
58 | OSC_PCI_CLOCK_PM_SUPPORT \
59 | OSC_PCI_MSI_SUPPORT)
Rafael J. Wysocki415e12b2011-01-07 00:55:09 +010060
Márton Némethc97adf92010-01-10 17:15:36 +010061static const struct acpi_device_id root_device_ids[] = {
Thomas Renninger1ba90e32007-07-23 14:44:41 +020062 {"PNP0A03", 0},
63 {"", 0},
64};
Thomas Renninger1ba90e32007-07-23 14:44:41 +020065
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +010066static struct acpi_scan_handler pci_root_handler = {
Thomas Renninger1ba90e32007-07-23 14:44:41 +020067 .ids = root_device_ids,
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +010068 .attach = acpi_pci_root_add,
69 .detach = acpi_pci_root_remove,
Toshi Kanica499fc2013-11-20 14:25:34 +010070 .hotplug = {
Rafael J. Wysocki3338db02013-11-22 21:55:20 +010071 .enabled = true,
72 .scan_dependent = acpi_pci_root_scan_dependent,
Toshi Kanica499fc2013-11-20 14:25:34 +010073 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070074};
75
Kenji Kaneshige63f10f02009-02-09 15:59:29 +090076static DEFINE_MUTEX(osc_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
Alexander Chiang27558202009-06-10 19:55:14 +000078/**
79 * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
80 * @handle - the ACPI CA node in question.
81 *
82 * Note: we could make this API take a struct acpi_device * instead, but
83 * for now, it's more convenient to operate on an acpi_handle.
84 */
85int acpi_is_root_bridge(acpi_handle handle)
86{
87 int ret;
88 struct acpi_device *device;
89
90 ret = acpi_bus_get_device(handle, &device);
91 if (ret)
92 return 0;
93
94 ret = acpi_match_device_ids(device, root_device_ids);
95 if (ret)
96 return 0;
97 else
98 return 1;
99}
100EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
101
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102static acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400103get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104{
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700105 struct resource *res = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 struct acpi_resource_address64 address;
Bjorn Helgaasf6c1c8f2012-06-21 23:48:50 -0600107 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
Bjorn Helgaasf6c1c8f2012-06-21 23:48:50 -0600109 status = acpi_resource_to_address64(resource, &address);
110 if (ACPI_FAILURE(status))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 return AE_OK;
112
Len Brown4be44fc2005-08-05 00:44:28 -0400113 if ((address.address_length > 0) &&
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700114 (address.resource_type == ACPI_BUS_NUMBER_RANGE)) {
115 res->start = address.minimum;
116 res->end = address.minimum + address.address_length - 1;
117 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
119 return AE_OK;
120}
121
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600122static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700123 struct resource *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124{
125 acpi_status status;
126
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700127 res->start = -1;
Len Brown4be44fc2005-08-05 00:44:28 -0400128 status =
129 acpi_walk_resources(handle, METHOD_NAME__CRS,
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700130 get_root_bridge_busnr_callback, res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 if (ACPI_FAILURE(status))
132 return status;
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700133 if (res->start == -1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 return AE_ERROR;
135 return AE_OK;
136}
137
Bjorn Helgaas955f14b2013-09-05 15:07:45 -0600138struct pci_osc_bit_struct {
139 u32 bit;
140 char *desc;
141};
142
143static struct pci_osc_bit_struct pci_osc_support_bit[] = {
144 { OSC_PCI_EXT_CONFIG_SUPPORT, "ExtendedConfig" },
145 { OSC_PCI_ASPM_SUPPORT, "ASPM" },
146 { OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" },
147 { OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" },
148 { OSC_PCI_MSI_SUPPORT, "MSI" },
149};
150
151static struct pci_osc_bit_struct pci_osc_control_bit[] = {
152 { OSC_PCI_EXPRESS_NATIVE_HP_CONTROL, "PCIeHotplug" },
153 { OSC_PCI_SHPC_NATIVE_HP_CONTROL, "SHPCHotplug" },
154 { OSC_PCI_EXPRESS_PME_CONTROL, "PME" },
155 { OSC_PCI_EXPRESS_AER_CONTROL, "AER" },
156 { OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" },
157};
158
159static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word,
160 struct pci_osc_bit_struct *table, int size)
161{
162 char buf[80];
163 int i, len = 0;
164 struct pci_osc_bit_struct *entry;
165
166 buf[0] = '\0';
167 for (i = 0, entry = table; i < size; i++, entry++)
168 if (word & entry->bit)
169 len += snprintf(buf + len, sizeof(buf) - len, "%s%s",
170 len ? " " : "", entry->desc);
171
172 dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf);
173}
174
175static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word)
176{
177 decode_osc_bits(root, msg, word, pci_osc_support_bit,
178 ARRAY_SIZE(pci_osc_support_bit));
179}
180
181static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word)
182{
183 decode_osc_bits(root, msg, word, pci_osc_control_bit,
184 ARRAY_SIZE(pci_osc_control_bit));
185}
186
Shaohua Li3a9622d2009-10-29 11:04:50 +0800187static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766";
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900188
189static acpi_status acpi_pci_run_osc(acpi_handle handle,
190 const u32 *capbuf, u32 *retval)
191{
Shaohua Li3a9622d2009-10-29 11:04:50 +0800192 struct acpi_osc_context context = {
193 .uuid_str = pci_osc_uuid_str,
194 .rev = 1,
195 .cap.length = 12,
196 .cap.pointer = (void *)capbuf,
197 };
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900198 acpi_status status;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900199
Shaohua Li3a9622d2009-10-29 11:04:50 +0800200 status = acpi_run_osc(handle, &context);
201 if (ACPI_SUCCESS(status)) {
202 *retval = *((u32 *)(context.ret.pointer + 8));
203 kfree(context.ret.pointer);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900204 }
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900205 return status;
206}
207
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200208static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root,
209 u32 support,
210 u32 *control)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900211{
212 acpi_status status;
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200213 u32 result, capbuf[3];
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900214
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200215 support &= OSC_PCI_SUPPORT_MASKS;
216 support |= root->osc_support_set;
217
Bjorn Helgaasb938a222013-09-05 15:05:54 -0600218 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
219 capbuf[OSC_SUPPORT_DWORD] = support;
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200220 if (control) {
221 *control &= OSC_PCI_CONTROL_MASKS;
Bjorn Helgaasb938a222013-09-05 15:05:54 -0600222 capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set;
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200223 } else {
Yinghai Lu545d6e12013-03-28 04:28:58 +0000224 /* Run _OSC query only with existing controls. */
Bjorn Helgaasb938a222013-09-05 15:05:54 -0600225 capbuf[OSC_CONTROL_DWORD] = root->osc_control_set;
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200226 }
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900227
228 status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
229 if (ACPI_SUCCESS(status)) {
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200230 root->osc_support_set = support;
Rafael J. Wysocki2b8fd912010-08-23 23:55:59 +0200231 if (control)
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200232 *control = result;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900233 }
234 return status;
235}
236
237static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
238{
239 acpi_status status;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900240
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900241 mutex_lock(&osc_lock);
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200242 status = acpi_pci_query_osc(root, flags, NULL);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900243 mutex_unlock(&osc_lock);
244 return status;
245}
246
Alex Chiang76d56de2009-07-23 17:03:00 -0600247struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900248{
249 struct acpi_pci_root *root;
Taku Izumicd4faf92012-09-18 15:23:23 +0900250 struct acpi_device *device;
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600251
Taku Izumicd4faf92012-09-18 15:23:23 +0900252 if (acpi_bus_get_device(handle, &device) ||
253 acpi_match_device_ids(device, root_device_ids))
254 return NULL;
255
256 root = acpi_driver_data(device);
257
258 return root;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900259}
Alex Chiang76d56de2009-07-23 17:03:00 -0600260EXPORT_SYMBOL_GPL(acpi_pci_find_root);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900261
Alexander Chiang2f7bbce2009-06-10 19:55:20 +0000262struct acpi_handle_node {
263 struct list_head node;
264 acpi_handle handle;
265};
266
267/**
268 * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev
269 * @handle: the handle in question
270 *
271 * Given an ACPI CA handle, the desired PCI device is located in the
272 * list of PCI devices.
273 *
274 * If the device is found, its reference count is increased and this
275 * function returns a pointer to its data structure. The caller must
276 * decrement the reference count by calling pci_dev_put().
277 * If no device is found, %NULL is returned.
278 */
279struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
280{
281 int dev, fn;
282 unsigned long long adr;
283 acpi_status status;
284 acpi_handle phandle;
285 struct pci_bus *pbus;
286 struct pci_dev *pdev = NULL;
287 struct acpi_handle_node *node, *tmp;
288 struct acpi_pci_root *root;
289 LIST_HEAD(device_list);
290
291 /*
292 * Walk up the ACPI CA namespace until we reach a PCI root bridge.
293 */
294 phandle = handle;
295 while (!acpi_is_root_bridge(phandle)) {
296 node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL);
297 if (!node)
298 goto out;
299
300 INIT_LIST_HEAD(&node->node);
301 node->handle = phandle;
302 list_add(&node->node, &device_list);
303
304 status = acpi_get_parent(phandle, &phandle);
305 if (ACPI_FAILURE(status))
306 goto out;
307 }
308
309 root = acpi_pci_find_root(phandle);
310 if (!root)
311 goto out;
312
313 pbus = root->bus;
314
315 /*
316 * Now, walk back down the PCI device tree until we return to our
317 * original handle. Assumes that everything between the PCI root
318 * bridge and the device we're looking for must be a P2P bridge.
319 */
320 list_for_each_entry(node, &device_list, node) {
321 acpi_handle hnd = node->handle;
322 status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr);
323 if (ACPI_FAILURE(status))
324 goto out;
325 dev = (adr >> 16) & 0xffff;
326 fn = adr & 0xffff;
327
328 pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn));
Troy Moure412af972009-06-25 17:05:35 -0600329 if (!pdev || hnd == handle)
Alexander Chiang2f7bbce2009-06-10 19:55:20 +0000330 break;
331
332 pbus = pdev->subordinate;
333 pci_dev_put(pdev);
Rafael J. Wysocki497fb542009-10-13 01:01:57 +0200334
335 /*
336 * This function may be called for a non-PCI device that has a
337 * PCI parent (eg. a disk under a PCI SATA controller). In that
338 * case pdev->subordinate will be NULL for the parent.
339 */
340 if (!pbus) {
341 dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n");
342 pdev = NULL;
343 break;
344 }
Alexander Chiang2f7bbce2009-06-10 19:55:20 +0000345 }
346out:
347 list_for_each_entry_safe(node, tmp, &device_list, node)
348 kfree(node);
349
350 return pdev;
351}
352EXPORT_SYMBOL_GPL(acpi_get_pci_dev);
353
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900354/**
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200355 * acpi_pci_osc_control_set - Request control of PCI root _OSC features.
356 * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex).
357 * @mask: Mask of _OSC bits to request control of, place to store control mask.
358 * @req: Mask of _OSC bits the control of is essential to the caller.
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900359 *
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200360 * Run _OSC query for @mask and if that is successful, compare the returned
361 * mask of control bits with @req. If all of the @req bits are set in the
362 * returned mask, run _OSC request for it.
363 *
364 * The variable at the @mask address may be modified regardless of whether or
365 * not the function returns success. On success it will contain the mask of
366 * _OSC bits the BIOS has granted control of, but its contents are meaningless
367 * on failure.
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900368 **/
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200369acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900370{
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900371 struct acpi_pci_root *root;
Bjorn Helgaas4ffe6e52013-09-05 15:07:41 -0600372 acpi_status status = AE_OK;
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200373 u32 ctrl, capbuf[3];
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900374
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200375 if (!mask)
376 return AE_BAD_PARAMETER;
377
378 ctrl = *mask & OSC_PCI_CONTROL_MASKS;
379 if ((ctrl & req) != req)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900380 return AE_TYPE;
381
382 root = acpi_pci_find_root(handle);
383 if (!root)
384 return AE_NOT_EXIST;
385
386 mutex_lock(&osc_lock);
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200387
388 *mask = ctrl | root->osc_control_set;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900389 /* No need to evaluate _OSC if the control was already granted. */
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200390 if ((root->osc_control_set & ctrl) == ctrl)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900391 goto out;
392
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200393 /* Need to check the available controls bits before requesting them. */
394 while (*mask) {
395 status = acpi_pci_query_osc(root, root->osc_support_set, mask);
396 if (ACPI_FAILURE(status))
397 goto out;
398 if (ctrl == *mask)
399 break;
Bjorn Helgaas955f14b2013-09-05 15:07:45 -0600400 decode_osc_control(root, "platform does not support",
401 ctrl & ~(*mask));
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200402 ctrl = *mask;
403 }
Rafael J. Wysocki2b8fd912010-08-23 23:55:59 +0200404
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200405 if ((ctrl & req) != req) {
Bjorn Helgaas955f14b2013-09-05 15:07:45 -0600406 decode_osc_control(root, "not requesting control; platform does not support",
407 req & ~(ctrl));
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900408 status = AE_SUPPORT;
409 goto out;
410 }
411
Bjorn Helgaasb938a222013-09-05 15:05:54 -0600412 capbuf[OSC_QUERY_DWORD] = 0;
413 capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set;
414 capbuf[OSC_CONTROL_DWORD] = ctrl;
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200415 status = acpi_pci_run_osc(handle, capbuf, mask);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900416 if (ACPI_SUCCESS(status))
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200417 root->osc_control_set = *mask;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900418out:
419 mutex_unlock(&osc_lock);
420 return status;
421}
Kenji Kaneshige9f5404d2009-02-09 16:00:04 +0900422EXPORT_SYMBOL(acpi_pci_osc_control_set);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900423
Bjorn Helgaas3e43abb2013-09-05 15:07:41 -0600424static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm,
425 int *clear_aspm)
426{
Bjorn Helgaas955f14b2013-09-05 15:07:45 -0600427 u32 support, control, requested;
Bjorn Helgaas3e43abb2013-09-05 15:07:41 -0600428 acpi_status status;
429 struct acpi_device *device = root->device;
430 acpi_handle handle = device->handle;
431
432 /*
433 * All supported architectures that use ACPI have support for
434 * PCI domains, so we indicate this in _OSC support capabilities.
435 */
Bjorn Helgaas65afe912013-09-05 15:07:43 -0600436 support = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
Bjorn Helgaas3e43abb2013-09-05 15:07:41 -0600437 if (pci_ext_cfg_avail())
Bjorn Helgaasb8eb67f2013-09-05 15:07:42 -0600438 support |= OSC_PCI_EXT_CONFIG_SUPPORT;
Bjorn Helgaas1b2a7be2013-09-05 15:07:42 -0600439 if (pcie_aspm_support_enabled())
Bjorn Helgaasb8eb67f2013-09-05 15:07:42 -0600440 support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT;
Bjorn Helgaas3e43abb2013-09-05 15:07:41 -0600441 if (pci_msi_enabled())
Bjorn Helgaasb8eb67f2013-09-05 15:07:42 -0600442 support |= OSC_PCI_MSI_SUPPORT;
Bjorn Helgaas955f14b2013-09-05 15:07:45 -0600443
444 decode_osc_support(root, "OS supports", support);
Bjorn Helgaas1b2a7be2013-09-05 15:07:42 -0600445 status = acpi_pci_osc_support(root, support);
446 if (ACPI_FAILURE(status)) {
Bjorn Helgaas65afe912013-09-05 15:07:43 -0600447 dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n",
448 acpi_format_exception(status));
Bjorn Helgaas1b2a7be2013-09-05 15:07:42 -0600449 *no_aspm = 1;
Bjorn Helgaas65afe912013-09-05 15:07:43 -0600450 return;
Bjorn Helgaas3e43abb2013-09-05 15:07:41 -0600451 }
452
Bjorn Helgaas43613a12013-09-05 15:07:43 -0600453 if (pcie_ports_disabled) {
454 dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n");
455 return;
456 }
457
Bjorn Helgaasde189662013-09-05 15:50:52 -0600458 if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) {
Bjorn Helgaas955f14b2013-09-05 15:07:45 -0600459 decode_osc_support(root, "not requesting OS control; OS requires",
460 ACPI_PCIE_REQ_SUPPORT);
Bjorn Helgaasde189662013-09-05 15:50:52 -0600461 return;
462 }
Bjorn Helgaas3e43abb2013-09-05 15:07:41 -0600463
Bjorn Helgaasde189662013-09-05 15:50:52 -0600464 control = OSC_PCI_EXPRESS_CAPABILITY_CONTROL
465 | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL
466 | OSC_PCI_EXPRESS_PME_CONTROL;
Bjorn Helgaas3e43abb2013-09-05 15:07:41 -0600467
Bjorn Helgaasde189662013-09-05 15:50:52 -0600468 if (pci_aer_available()) {
469 if (aer_acpi_firmware_first())
Bjorn Helgaas955f14b2013-09-05 15:07:45 -0600470 dev_info(&device->dev,
471 "PCIe AER handled by firmware\n");
Bjorn Helgaasde189662013-09-05 15:50:52 -0600472 else
473 control |= OSC_PCI_EXPRESS_AER_CONTROL;
474 }
475
Bjorn Helgaas955f14b2013-09-05 15:07:45 -0600476 requested = control;
Bjorn Helgaasde189662013-09-05 15:50:52 -0600477 status = acpi_pci_osc_control_set(handle, &control,
478 OSC_PCI_EXPRESS_CAPABILITY_CONTROL);
479 if (ACPI_SUCCESS(status)) {
Bjorn Helgaas955f14b2013-09-05 15:07:45 -0600480 decode_osc_control(root, "OS now controls", control);
Bjorn Helgaasde189662013-09-05 15:50:52 -0600481 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
Bjorn Helgaas3e43abb2013-09-05 15:07:41 -0600482 /*
Bjorn Helgaasde189662013-09-05 15:50:52 -0600483 * We have ASPM control, but the FADT indicates
484 * that it's unsupported. Clear it.
Bjorn Helgaas3e43abb2013-09-05 15:07:41 -0600485 */
Bjorn Helgaasde189662013-09-05 15:50:52 -0600486 *clear_aspm = 1;
Bjorn Helgaas3e43abb2013-09-05 15:07:41 -0600487 }
488 } else {
Bjorn Helgaas955f14b2013-09-05 15:07:45 -0600489 decode_osc_control(root, "OS requested", requested);
490 decode_osc_control(root, "platform willing to grant", control);
491 dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n",
492 acpi_format_exception(status));
493
Bjorn Helgaasde189662013-09-05 15:50:52 -0600494 /*
495 * We want to disable ASPM here, but aspm_disabled
496 * needs to remain in its state from boot so that we
497 * properly handle PCIe 1.1 devices. So we set this
498 * flag here, to defer the action until after the ACPI
499 * root scan.
500 */
501 *no_aspm = 1;
Bjorn Helgaas3e43abb2013-09-05 15:07:41 -0600502 }
503}
504
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +0100505static int acpi_pci_root_add(struct acpi_device *device,
506 const struct acpi_device_id *not_used)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507{
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600508 unsigned long long segment, bus;
509 acpi_status status;
510 int result;
511 struct acpi_pci_root *root;
Jiang Liubfe24142013-05-28 18:31:27 -0600512 acpi_handle handle = device->handle;
Bjorn Helgaas3e43abb2013-09-05 15:07:41 -0600513 int no_aspm = 0, clear_aspm = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700515 root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
516 if (!root)
517 return -ENOMEM;
518
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600519 segment = 0;
Jiang Liubfe24142013-05-28 18:31:27 -0600520 status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL,
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600521 &segment);
522 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
Jiang Liu6dc7d222013-05-28 18:10:05 -0600523 dev_err(&device->dev, "can't evaluate _SEG\n");
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700524 result = -ENODEV;
525 goto end;
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600526 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600528 /* Check _CRS first, then _BBN. If no _BBN, default to zero. */
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700529 root->secondary.flags = IORESOURCE_BUS;
Jiang Liubfe24142013-05-28 18:31:27 -0600530 status = try_get_root_bridge_busnr(handle, &root->secondary);
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600531 if (ACPI_FAILURE(status)) {
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700532 /*
533 * We need both the start and end of the downstream bus range
534 * to interpret _CBA (MMCONFIG base address), so it really is
535 * supposed to be in _CRS. If we don't find it there, all we
536 * can do is assume [_BBN-0xFF] or [0-0xFF].
537 */
538 root->secondary.end = 0xFF;
Jiang Liu6dc7d222013-05-28 18:10:05 -0600539 dev_warn(&device->dev,
540 FW_BUG "no secondary bus range in _CRS\n");
Jiang Liubfe24142013-05-28 18:31:27 -0600541 status = acpi_evaluate_integer(handle, METHOD_NAME__BBN,
Jon Masone545b552011-06-19 18:51:37 -0500542 NULL, &bus);
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700543 if (ACPI_SUCCESS(status))
544 root->secondary.start = bus;
545 else if (status == AE_NOT_FOUND)
546 root->secondary.start = 0;
547 else {
Jiang Liu6dc7d222013-05-28 18:10:05 -0600548 dev_err(&device->dev, "can't evaluate _BBN\n");
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700549 result = -ENODEV;
550 goto end;
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600551 }
552 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553
Patrick Mochel32917e52006-05-19 16:54:39 -0400554 root->device = device;
Bjorn Helgaas07054952009-06-18 14:47:07 -0600555 root->segment = segment & 0xFFFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
557 strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700558 device->driver_data = root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559
Jiang Liu6dc7d222013-05-28 18:10:05 -0600560 pr_info(PREFIX "%s [%s] (domain %04x %pR)\n",
Bjorn Helgaasd4761ba2012-10-30 15:24:50 +0900561 acpi_device_name(device), acpi_device_bid(device),
562 root->segment, &root->secondary);
563
Jiang Liubfe24142013-05-28 18:31:27 -0600564 root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle);
Jiang Liuf4b57a32012-06-22 14:55:16 +0800565
Bjorn Helgaas3e43abb2013-09-05 15:07:41 -0600566 negotiate_os_control(root, &no_aspm, &clear_aspm);
Rafael J. Wysocki415e12b2011-01-07 00:55:09 +0100567
Neil Horman3dc48af2013-08-29 16:17:05 -0400568 /*
569 * TBD: Need PCI interface for enumeration/configuration of roots.
570 */
571
572 /*
573 * Scan the Root Bridge
574 * --------------------
575 * Must do this prior to any attempt to bind the root device, as the
576 * PCI namespace does not get created until this call is made (and
577 * thus the root bridge's pci_dev does not exist).
578 */
579 root->bus = pci_acpi_scan_root(root);
580 if (!root->bus) {
581 dev_err(&device->dev,
582 "Bus %04x:%02x not present in PCI namespace\n",
583 root->segment, (unsigned int)root->secondary.start);
Rafael J. Wysockif516bde2013-11-14 00:54:17 +0100584 device->driver_data = NULL;
Neil Horman3dc48af2013-08-29 16:17:05 -0400585 result = -ENODEV;
586 goto end;
587 }
588
589 if (clear_aspm) {
590 dev_info(&device->dev, "Disabling ASPM (FADT indicates it is unsupported)\n");
591 pcie_clear_aspm(root->bus);
592 }
593 if (no_aspm)
594 pcie_no_aspm();
595
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100596 pci_acpi_add_bus_pm_notifier(device, root->bus);
597 if (device->wakeup.flags.run_wake)
598 device_set_run_wake(root->bus->bridge, true);
599
Yinghai Lu3c449ed2012-11-03 21:39:31 -0700600 if (system_state != SYSTEM_BOOTING) {
601 pcibios_resource_survey_bus(root->bus);
Yinghai Lu39772032013-07-22 14:37:18 -0700602 pci_assign_unassigned_root_bus_resources(root->bus);
Jiang Liu516ca222013-05-28 18:04:46 -0600603 }
Yinghai Lu62a08c52012-10-30 14:31:32 -0600604
Rafael J. Wysocki7a3bb552014-01-10 15:23:14 +0100605 pci_lock_rescan_remove();
Bjorn Helgaascaf420c2009-06-18 14:46:57 -0600606 pci_bus_add_devices(root->bus);
Rafael J. Wysocki7a3bb552014-01-10 15:23:14 +0100607 pci_unlock_rescan_remove();
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +0100608 return 1;
Rafael J. Wysocki47525cd2012-12-21 00:36:45 +0100609
Rafael J. Wysocki47525cd2012-12-21 00:36:45 +0100610end:
611 kfree(root);
612 return result;
Rajesh Shahc431ada2005-04-28 00:25:45 -0700613}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +0100615static void acpi_pci_root_remove(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616{
Bjorn Helgaascaf420c2009-06-18 14:46:57 -0600617 struct acpi_pci_root *root = acpi_driver_data(device);
Jiang Liuc8e9afb2012-09-18 15:20:34 +0900618
Rafael J. Wysocki7a3bb552014-01-10 15:23:14 +0100619 pci_lock_rescan_remove();
620
Yinghai Lu9738a1f2012-10-30 14:31:43 -0600621 pci_stop_root_bus(root->bus);
622
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100623 device_set_run_wake(root->bus->bridge, false);
624 pci_acpi_remove_bus_pm_notifier(device);
625
Yinghai Lu9738a1f2012-10-30 14:31:43 -0600626 pci_remove_root_bus(root->bus);
627
Rafael J. Wysocki7a3bb552014-01-10 15:23:14 +0100628 pci_unlock_rescan_remove();
629
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 kfree(root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631}
632
Rafael J. Wysocki00c43b92013-01-30 14:27:33 +0100633void __init acpi_pci_root_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634{
Rafael J. Wysockid3072e62011-01-16 20:44:22 +0100635 acpi_hest_init();
Rafael J. Wysocki3338db02013-11-22 21:55:20 +0100636 if (acpi_pci_disabled)
Yinghai Lu668192b2013-01-21 13:20:48 -0800637 return;
Yinghai Lu668192b2013-01-21 13:20:48 -0800638
Rafael J. Wysocki3338db02013-11-22 21:55:20 +0100639 pci_acpi_crs_quirks();
640 acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root");
Yinghai Lu668192b2013-01-21 13:20:48 -0800641}