blob: 2865ba37e2954c90ba9f796b8284c86d74f08c6a [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * drivers/pci/pci-driver.c
3 *
Greg Kroah-Hartman2b937302007-11-28 12:23:18 -08004 * (C) Copyright 2002-2004, 2007 Greg Kroah-Hartman <greg@kroah.com>
5 * (C) Copyright 2007 Novell Inc.
6 *
7 * Released under the GPL v2 only.
8 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 */
10
11#include <linux/pci.h>
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/device.h>
Andi Kleend42c6992005-07-06 19:56:03 +020015#include <linux/mempolicy.h>
Tim Schmielau4e57b682005-10-30 15:03:48 -080016#include <linux/string.h>
17#include <linux/slab.h>
Tim Schmielau8c65b4a2005-11-07 00:59:43 -080018#include <linux/sched.h>
Rusty Russell873392c2008-12-31 23:54:56 +103019#include <linux/cpu.h>
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +010020#include <linux/pm_runtime.h>
Rafael J. Wysockieea3fc032011-07-06 10:51:40 +020021#include <linux/suspend.h>
Khalid Aziz4fc9bbf2013-11-27 15:19:25 -070022#include <linux/kexec.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include "pci.h"
24
Greg Kroah-Hartman75865852005-06-30 02:18:12 -070025struct pci_dynid {
26 struct list_head node;
27 struct pci_device_id id;
28};
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
30/**
Tejun Heo9dba9102009-09-03 15:26:36 +090031 * pci_add_dynid - add a new PCI device ID to this driver and re-probe devices
32 * @drv: target pci driver
33 * @vendor: PCI vendor ID
34 * @device: PCI device ID
35 * @subvendor: PCI subvendor ID
36 * @subdevice: PCI subdevice ID
37 * @class: PCI class
38 * @class_mask: PCI class mask
39 * @driver_data: private driver data
40 *
41 * Adds a new dynamic pci device ID to this driver and causes the
42 * driver to probe for all devices again. @drv must have been
43 * registered prior to calling this function.
44 *
45 * CONTEXT:
46 * Does GFP_KERNEL allocation.
47 *
48 * RETURNS:
49 * 0 on success, -errno on failure.
50 */
51int pci_add_dynid(struct pci_driver *drv,
52 unsigned int vendor, unsigned int device,
53 unsigned int subvendor, unsigned int subdevice,
54 unsigned int class, unsigned int class_mask,
55 unsigned long driver_data)
56{
57 struct pci_dynid *dynid;
Tejun Heo9dba9102009-09-03 15:26:36 +090058
59 dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
60 if (!dynid)
61 return -ENOMEM;
62
63 dynid->id.vendor = vendor;
64 dynid->id.device = device;
65 dynid->id.subvendor = subvendor;
66 dynid->id.subdevice = subdevice;
67 dynid->id.class = class;
68 dynid->id.class_mask = class_mask;
69 dynid->id.driver_data = driver_data;
70
71 spin_lock(&drv->dynids.lock);
72 list_add_tail(&dynid->node, &drv->dynids.list);
73 spin_unlock(&drv->dynids.lock);
74
Tobias Klauser3b7f1012014-07-25 10:36:14 +020075 return driver_attach(&drv->driver);
Tejun Heo9dba9102009-09-03 15:26:36 +090076}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -060077EXPORT_SYMBOL_GPL(pci_add_dynid);
Tejun Heo9dba9102009-09-03 15:26:36 +090078
79static void pci_free_dynids(struct pci_driver *drv)
80{
81 struct pci_dynid *dynid, *n;
82
83 spin_lock(&drv->dynids.lock);
84 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
85 list_del(&dynid->node);
86 kfree(dynid);
87 }
88 spin_unlock(&drv->dynids.lock);
89}
90
Tejun Heo9dba9102009-09-03 15:26:36 +090091/**
92 * store_new_id - sysfs frontend to pci_add_dynid()
Randy Dunlap8f7020d2005-10-23 11:57:38 -070093 * @driver: target device driver
94 * @buf: buffer for scanning device ID data
95 * @count: input size
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 *
Tejun Heo9dba9102009-09-03 15:26:36 +090097 * Allow PCI IDs to be added to an existing driver via sysfs.
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -040099static ssize_t store_new_id(struct device_driver *driver, const char *buf,
100 size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 struct pci_driver *pdrv = to_pci_driver(driver);
Jean Delvareb41d6cf2008-08-17 21:06:59 +0200103 const struct pci_device_id *ids = pdrv->id_table;
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400104 __u32 vendor, device, subvendor = PCI_ANY_ID,
105 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
106 unsigned long driver_data = 0;
107 int fields = 0;
Bandan Das8895d3b2014-04-01 21:32:59 -0400108 int retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
Jean Delvareb41d6cf2008-08-17 21:06:59 +0200110 fields = sscanf(buf, "%x %x %x %x %x %x %lx",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 &vendor, &device, &subvendor, &subdevice,
112 &class, &class_mask, &driver_data);
Jean Delvare6ba18632007-04-07 17:21:28 +0200113 if (fields < 2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 return -EINVAL;
115
Bandan Das8895d3b2014-04-01 21:32:59 -0400116 if (fields != 7) {
117 struct pci_dev *pdev = kzalloc(sizeof(*pdev), GFP_KERNEL);
118 if (!pdev)
119 return -ENOMEM;
120
121 pdev->vendor = vendor;
122 pdev->device = device;
123 pdev->subsystem_vendor = subvendor;
124 pdev->subsystem_device = subdevice;
125 pdev->class = class;
126
127 if (pci_match_id(pdrv->id_table, pdev))
128 retval = -EEXIST;
129
130 kfree(pdev);
131
132 if (retval)
133 return retval;
134 }
135
Jean Delvareb41d6cf2008-08-17 21:06:59 +0200136 /* Only accept driver_data values that match an existing id_table
137 entry */
Chris Wright2debb4d2008-11-25 19:36:10 -0800138 if (ids) {
139 retval = -EINVAL;
140 while (ids->vendor || ids->subvendor || ids->class_mask) {
141 if (driver_data == ids->driver_data) {
142 retval = 0;
143 break;
144 }
145 ids++;
Jean Delvareb41d6cf2008-08-17 21:06:59 +0200146 }
Chris Wright2debb4d2008-11-25 19:36:10 -0800147 if (retval) /* No match */
148 return retval;
Jean Delvareb41d6cf2008-08-17 21:06:59 +0200149 }
Jean Delvareb41d6cf2008-08-17 21:06:59 +0200150
Tejun Heo9dba9102009-09-03 15:26:36 +0900151 retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice,
152 class, class_mask, driver_data);
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700153 if (retval)
154 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 return count;
156}
Greg Kroah-Hartman2229c1f2013-10-07 14:51:20 -0600157static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
Chris Wright09943752009-02-23 21:52:23 -0800159/**
160 * store_remove_id - remove a PCI device ID from this driver
161 * @driver: target device driver
162 * @buf: buffer for scanning device ID data
163 * @count: input size
164 *
165 * Removes a dynamic pci device ID to this driver.
166 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400167static ssize_t store_remove_id(struct device_driver *driver, const char *buf,
168 size_t count)
Chris Wright09943752009-02-23 21:52:23 -0800169{
170 struct pci_dynid *dynid, *n;
171 struct pci_driver *pdrv = to_pci_driver(driver);
172 __u32 vendor, device, subvendor = PCI_ANY_ID,
173 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
174 int fields = 0;
Zhen Lei9222097f2015-09-10 18:40:31 +0800175 size_t retval = -ENODEV;
Chris Wright09943752009-02-23 21:52:23 -0800176
177 fields = sscanf(buf, "%x %x %x %x %x %x",
178 &vendor, &device, &subvendor, &subdevice,
179 &class, &class_mask);
180 if (fields < 2)
181 return -EINVAL;
182
183 spin_lock(&pdrv->dynids.lock);
184 list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) {
185 struct pci_device_id *id = &dynid->id;
186 if ((id->vendor == vendor) &&
187 (id->device == device) &&
188 (subvendor == PCI_ANY_ID || id->subvendor == subvendor) &&
189 (subdevice == PCI_ANY_ID || id->subdevice == subdevice) &&
190 !((id->class ^ class) & class_mask)) {
191 list_del(&dynid->node);
192 kfree(dynid);
Zhen Lei9222097f2015-09-10 18:40:31 +0800193 retval = count;
Chris Wright09943752009-02-23 21:52:23 -0800194 break;
195 }
196 }
197 spin_unlock(&pdrv->dynids.lock);
198
Zhen Lei9222097f2015-09-10 18:40:31 +0800199 return retval;
Chris Wright09943752009-02-23 21:52:23 -0800200}
Greg Kroah-Hartman2229c1f2013-10-07 14:51:20 -0600201static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id);
Chris Wright09943752009-02-23 21:52:23 -0800202
Greg Kroah-Hartman2229c1f2013-10-07 14:51:20 -0600203static struct attribute *pci_drv_attrs[] = {
204 &driver_attr_new_id.attr,
205 &driver_attr_remove_id.attr,
206 NULL,
Konstantin Khlebnikovbfb09a82012-08-08 14:47:51 +0400207};
Greg Kroah-Hartman2229c1f2013-10-07 14:51:20 -0600208ATTRIBUTE_GROUPS(pci_drv);
Alan Sterned283e92012-01-24 14:35:13 -0500209
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210/**
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700211 * pci_match_id - See if a pci device matches a given pci_id table
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 * @ids: array of PCI device id structures to search in
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700213 * @dev: the PCI device structure to match against.
214 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 * Used by a driver to check whether a PCI device present in the
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700216 * system is in its list of supported devices. Returns the matching
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 * pci_device_id structure or %NULL if there is no match.
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700218 *
Randy Dunlap8b607562007-05-09 07:19:14 +0200219 * Deprecated, don't use this as it will not catch any dynamic ids
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700220 * that a driver might want to check for.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 */
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700222const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
223 struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224{
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700225 if (ids) {
226 while (ids->vendor || ids->subvendor || ids->class_mask) {
227 if (pci_match_one_device(ids, dev))
228 return ids;
229 ids++;
230 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 }
232 return NULL;
233}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -0600234EXPORT_SYMBOL(pci_match_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235
Alex Williamson782a9852014-05-20 08:53:21 -0600236static const struct pci_device_id pci_device_id_any = {
237 .vendor = PCI_ANY_ID,
238 .device = PCI_ANY_ID,
239 .subvendor = PCI_ANY_ID,
240 .subdevice = PCI_ANY_ID,
241};
242
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243/**
Randy Dunlapae9608a2007-01-09 21:41:01 -0800244 * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700245 * @drv: the PCI driver to match against
Henrik Kretzschmar39ba4872006-08-15 10:57:16 +0200246 * @dev: the PCI device structure to match against
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700247 *
248 * Used by a driver to check whether a PCI device present in the
249 * system is in its list of supported devices. Returns the matching
250 * pci_device_id structure or %NULL if there is no match.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 */
Adrian Bunkd73460d2007-10-24 18:27:18 +0200252static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
253 struct pci_dev *dev)
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700254{
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700255 struct pci_dynid *dynid;
Alex Williamson782a9852014-05-20 08:53:21 -0600256 const struct pci_device_id *found_id = NULL;
257
258 /* When driver_override is set, only bind to the matching driver */
259 if (dev->driver_override && strcmp(dev->driver_override, drv->name))
260 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
Russell King7461b602006-11-29 21:18:04 +0000262 /* Look at the dynamic ids first, before the static ones */
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700263 spin_lock(&drv->dynids.lock);
264 list_for_each_entry(dynid, &drv->dynids.list, node) {
265 if (pci_match_one_device(&dynid->id, dev)) {
Alex Williamson782a9852014-05-20 08:53:21 -0600266 found_id = &dynid->id;
267 break;
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700268 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 }
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700270 spin_unlock(&drv->dynids.lock);
Russell King7461b602006-11-29 21:18:04 +0000271
Alex Williamson782a9852014-05-20 08:53:21 -0600272 if (!found_id)
273 found_id = pci_match_id(drv->id_table, dev);
274
275 /* driver_override will always match, send a dummy id */
276 if (!found_id && dev->driver_override)
277 found_id = &pci_device_id_any;
278
279 return found_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280}
281
Rusty Russell873392c2008-12-31 23:54:56 +1030282struct drv_dev_and_id {
283 struct pci_driver *drv;
284 struct pci_dev *dev;
285 const struct pci_device_id *id;
286};
287
288static long local_pci_probe(void *_ddi)
289{
290 struct drv_dev_and_id *ddi = _ddi;
Huang Ying967577b2012-11-20 16:08:22 +0800291 struct pci_dev *pci_dev = ddi->dev;
292 struct pci_driver *pci_drv = ddi->drv;
293 struct device *dev = &pci_dev->dev;
Alan Sternf3ec4f82010-06-08 15:23:51 -0400294 int rc;
Rusty Russell873392c2008-12-31 23:54:56 +1030295
Huang Ying967577b2012-11-20 16:08:22 +0800296 /*
297 * Unbound PCI devices are always put in D0, regardless of
298 * runtime PM status. During probe, the device is set to
299 * active and the usage count is incremented. If the driver
300 * supports runtime PM, it should call pm_runtime_put_noidle()
301 * in its probe routine and pm_runtime_get_noresume() in its
302 * remove routine.
Alan Sternf3ec4f82010-06-08 15:23:51 -0400303 */
Huang Ying967577b2012-11-20 16:08:22 +0800304 pm_runtime_get_sync(dev);
305 pci_dev->driver = pci_drv;
306 rc = pci_drv->probe(pci_dev, ddi->id);
Stephen M. Cameronf92d74c2013-11-01 14:34:55 -0500307 if (!rc)
308 return rc;
309 if (rc < 0) {
Huang Ying967577b2012-11-20 16:08:22 +0800310 pci_dev->driver = NULL;
311 pm_runtime_put_sync(dev);
Stephen M. Cameronf92d74c2013-11-01 14:34:55 -0500312 return rc;
Alan Sternf3ec4f82010-06-08 15:23:51 -0400313 }
Stephen M. Cameronf92d74c2013-11-01 14:34:55 -0500314 /*
315 * Probe function should return < 0 for failure, 0 for success
316 * Treat values > 0 as success, but warn.
317 */
318 dev_warn(dev, "Driver probe function unexpectedly returned %d\n", rc);
319 return 0;
Rusty Russell873392c2008-12-31 23:54:56 +1030320}
321
Andi Kleend42c6992005-07-06 19:56:03 +0200322static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
323 const struct pci_device_id *id)
324{
Rusty Russell873392c2008-12-31 23:54:56 +1030325 int error, node;
326 struct drv_dev_and_id ddi = { drv, dev, id };
Mike Travisf70316d2008-04-04 18:11:06 -0700327
Alexander Duyck12c31562013-11-18 10:59:59 -0700328 /*
329 * Execute driver initialization on node where the device is
330 * attached. This way the driver likely allocates its local memory
331 * on the right node.
332 */
Rusty Russell873392c2008-12-31 23:54:56 +1030333 node = dev_to_node(&dev->dev);
Alexander Duyck12c31562013-11-18 10:59:59 -0700334
335 /*
336 * On NUMA systems, we are likely to call a PF probe function using
337 * work_on_cpu(). If that probe calls pci_enable_sriov() (which
338 * adds the VF devices via pci_bus_add_device()), we may re-enter
339 * this function to call the VF probe function. Calling
340 * work_on_cpu() again will cause a lockdep warning. Since VFs are
341 * always on the same node as the PF, we can work around this by
342 * avoiding work_on_cpu() when we're already on the correct node.
343 *
344 * Preemption is enabled, so it's theoretically unsafe to use
345 * numa_node_id(), but even if we run the probe function on the
346 * wrong node, it should be functionally correct.
347 */
348 if (node >= 0 && node != numa_node_id()) {
Rusty Russell873392c2008-12-31 23:54:56 +1030349 int cpu;
Rusty Russell873392c2008-12-31 23:54:56 +1030350
351 get_online_cpus();
Rusty Russella70f7302009-03-13 14:49:46 +1030352 cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask);
Rusty Russell873392c2008-12-31 23:54:56 +1030353 if (cpu < nr_cpu_ids)
354 error = work_on_cpu(cpu, local_pci_probe, &ddi);
355 else
356 error = local_pci_probe(&ddi);
357 put_online_cpus();
358 } else
359 error = local_pci_probe(&ddi);
Alexander Duyck12c31562013-11-18 10:59:59 -0700360
Andi Kleend42c6992005-07-06 19:56:03 +0200361 return error;
362}
363
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364/**
Randy Dunlap23ea3792010-11-18 15:02:31 -0800365 * __pci_device_probe - check if a driver wants to claim a specific PCI device
Randy Dunlap8f7020d2005-10-23 11:57:38 -0700366 * @drv: driver to call to check if it wants the PCI device
367 * @pci_dev: PCI device being probed
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700368 *
Randy Dunlap8f7020d2005-10-23 11:57:38 -0700369 * returns 0 on success, else error.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
371 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400372static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700373{
374 const struct pci_device_id *id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 int error = 0;
376
377 if (!pci_dev->driver && drv->probe) {
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700378 error = -ENODEV;
379
380 id = pci_match_device(drv, pci_dev);
381 if (id)
Andi Kleend42c6992005-07-06 19:56:03 +0200382 error = pci_call_probe(drv, pci_dev, id);
Huang Ying967577b2012-11-20 16:08:22 +0800383 if (error >= 0)
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700384 error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 }
386 return error;
387}
388
Jiang Liu890e4842015-06-10 16:54:58 +0800389int __weak pcibios_alloc_irq(struct pci_dev *dev)
390{
391 return 0;
392}
393
394void __weak pcibios_free_irq(struct pci_dev *dev)
395{
396}
397
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400398static int pci_device_probe(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399{
Jiang Liu890e4842015-06-10 16:54:58 +0800400 int error;
401 struct pci_dev *pci_dev = to_pci_dev(dev);
402 struct pci_driver *drv = to_pci_driver(dev->driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403
Jiang Liu890e4842015-06-10 16:54:58 +0800404 error = pcibios_alloc_irq(pci_dev);
405 if (error < 0)
406 return error;
407
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 pci_dev_get(pci_dev);
409 error = __pci_device_probe(drv, pci_dev);
Jiang Liu890e4842015-06-10 16:54:58 +0800410 if (error) {
411 pcibios_free_irq(pci_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 pci_dev_put(pci_dev);
Jiang Liu890e4842015-06-10 16:54:58 +0800413 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414
415 return error;
416}
417
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400418static int pci_device_remove(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400420 struct pci_dev *pci_dev = to_pci_dev(dev);
421 struct pci_driver *drv = pci_dev->driver;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
423 if (drv) {
Alan Sternf3ec4f82010-06-08 15:23:51 -0400424 if (drv->remove) {
425 pm_runtime_get_sync(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 drv->remove(pci_dev);
Alan Sternf3ec4f82010-06-08 15:23:51 -0400427 pm_runtime_put_noidle(dev);
428 }
Jiang Liu890e4842015-06-10 16:54:58 +0800429 pcibios_free_irq(pci_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 pci_dev->driver = NULL;
431 }
432
Alan Sternf3ec4f82010-06-08 15:23:51 -0400433 /* Undo the runtime PM settings in local_pci_probe() */
Huang Ying967577b2012-11-20 16:08:22 +0800434 pm_runtime_put_sync(dev);
Alan Sternf3ec4f82010-06-08 15:23:51 -0400435
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 /*
Shaohua Li2449e062006-10-20 14:45:32 -0700437 * If the device is still on, set the power state as "unknown",
438 * since it might change by the next time we load the driver.
439 */
440 if (pci_dev->current_state == PCI_D0)
441 pci_dev->current_state = PCI_UNKNOWN;
442
443 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 * We would love to complain here if pci_dev->is_enabled is set, that
445 * the driver should have called pci_disable_device(), but the
446 * unfortunate fact is there are too many odd BIOS and bridge setups
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700447 * that don't like drivers doing that all of the time.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 * Oh well, we can dream of sane hardware when we sleep, no matter how
449 * horrible the crap we have to deal with is when we are awake...
450 */
451
452 pci_dev_put(pci_dev);
453 return 0;
454}
455
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200456static void pci_device_shutdown(struct device *dev)
457{
458 struct pci_dev *pci_dev = to_pci_dev(dev);
459 struct pci_driver *drv = pci_dev->driver;
460
Huang Ying3ff2de92012-10-24 14:54:14 +0800461 pm_runtime_resume(dev);
462
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200463 if (drv && drv->shutdown)
464 drv->shutdown(pci_dev);
465 pci_msi_shutdown(pci_dev);
466 pci_msix_shutdown(pci_dev);
Rafael J. Wysocki5b415f12012-02-07 00:50:35 +0100467
Dave Young2965faa2015-09-09 15:38:55 -0700468#ifdef CONFIG_KEXEC_CORE
Rafael J. Wysocki5b415f12012-02-07 00:50:35 +0100469 /*
Khalid Aziz4fc9bbf2013-11-27 15:19:25 -0700470 * If this is a kexec reboot, turn off Bus Master bit on the
471 * device to tell it to not continue to do DMA. Don't touch
472 * devices in D3cold or unknown states.
473 * If it is not a kexec reboot, firmware will hit the PCI
474 * devices with big hammer and stop their DMA any way.
Khalid Azizb566a222012-04-27 13:00:33 -0600475 */
Khalid Aziz4fc9bbf2013-11-27 15:19:25 -0700476 if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
Konstantin Khlebnikov6e0eda32013-03-14 18:49:37 +0400477 pci_clear_master(pci_dev);
Khalid Aziz4fc9bbf2013-11-27 15:19:25 -0700478#endif
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200479}
480
Rafael J. Wysockiaa338602011-02-11 00:06:54 +0100481#ifdef CONFIG_PM
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100482
483/* Auxiliary functions used for system resume and run-time resume. */
484
485/**
486 * pci_restore_standard_config - restore standard config registers of PCI device
487 * @pci_dev: PCI device to handle
488 */
489static int pci_restore_standard_config(struct pci_dev *pci_dev)
490{
491 pci_update_current_state(pci_dev, PCI_UNKNOWN);
492
493 if (pci_dev->current_state != PCI_D0) {
494 int error = pci_set_power_state(pci_dev, PCI_D0);
495 if (error)
496 return error;
497 }
498
Jon Mason1d3c16a2010-11-30 17:43:26 -0600499 pci_restore_state(pci_dev);
500 return 0;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100501}
502
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100503#endif
504
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200505#ifdef CONFIG_PM_SLEEP
506
Rafael J. Wysockidb288c92012-07-05 15:20:00 -0600507static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
508{
509 pci_power_up(pci_dev);
510 pci_restore_state(pci_dev);
511 pci_fixup_device(pci_fixup_resume_early, pci_dev);
512}
513
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200514/*
515 * Default "suspend" method for devices that have no driver provided suspend,
Rafael J. Wysockifa58d302009-01-07 13:03:42 +0100516 * or not even a driver at all (second part).
517 */
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100518static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200519{
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200520 /*
521 * mark its power state as "unknown", since we don't know if
522 * e.g. the BIOS will change its device state when we suspend.
523 */
524 if (pci_dev->current_state == PCI_D0)
525 pci_dev->current_state = PCI_UNKNOWN;
526}
527
528/*
529 * Default "resume" method for devices that have no driver provided resume,
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100530 * or not even a driver at all (second part).
531 */
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100532static int pci_pm_reenable_device(struct pci_dev *pci_dev)
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100533{
534 int retval;
535
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200536 /* if the device was enabled before suspend, reenable */
537 retval = pci_reenable_device(pci_dev);
538 /*
539 * if the device was busmaster before the suspend, make it busmaster
540 * again
541 */
542 if (pci_dev->is_busmaster)
543 pci_set_master(pci_dev);
544
545 return retval;
546}
547
548static int pci_legacy_suspend(struct device *dev, pm_message_t state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400550 struct pci_dev *pci_dev = to_pci_dev(dev);
551 struct pci_driver *drv = pci_dev->driver;
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100552
Andrew Morton02669492006-03-23 01:38:34 -0800553 if (drv && drv->suspend) {
Rafael J. Wysocki99dadce2009-02-04 01:59:09 +0100554 pci_power_t prev = pci_dev->current_state;
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100555 int error;
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +0100556
Frans Pop57ef8022009-03-16 22:39:56 +0100557 error = drv->suspend(pci_dev, state);
558 suspend_report_result(drv->suspend, error);
559 if (error)
560 return error;
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +0100561
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100562 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
Rafael J. Wysocki99dadce2009-02-04 01:59:09 +0100563 && pci_dev->current_state != PCI_UNKNOWN) {
564 WARN_ONCE(pci_dev->current_state != prev,
565 "PCI PM: Device state not saved by %pF\n",
566 drv->suspend);
Rafael J. Wysocki99dadce2009-02-04 01:59:09 +0100567 }
Andrew Morton02669492006-03-23 01:38:34 -0800568 }
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100569
570 pci_fixup_device(pci_fixup_suspend, pci_dev);
571
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100572 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573}
574
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200575static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
Linus Torvaldscbd69db2006-06-24 14:50:29 -0700576{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400577 struct pci_dev *pci_dev = to_pci_dev(dev);
578 struct pci_driver *drv = pci_dev->driver;
Linus Torvaldscbd69db2006-06-24 14:50:29 -0700579
580 if (drv && drv->suspend_late) {
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100581 pci_power_t prev = pci_dev->current_state;
582 int error;
583
Frans Pop57ef8022009-03-16 22:39:56 +0100584 error = drv->suspend_late(pci_dev, state);
585 suspend_report_result(drv->suspend_late, error);
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100586 if (error)
587 return error;
588
589 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
590 && pci_dev->current_state != PCI_UNKNOWN) {
591 WARN_ONCE(pci_dev->current_state != prev,
592 "PCI PM: Device state not saved by %pF\n",
593 drv->suspend_late);
Andreas Noever7d2a01b2014-06-03 22:04:09 +0200594 goto Fixup;
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100595 }
Linus Torvaldscbd69db2006-06-24 14:50:29 -0700596 }
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100597
598 if (!pci_dev->state_saved)
599 pci_save_state(pci_dev);
600
601 pci_pm_set_unknown_state(pci_dev);
602
Andreas Noever7d2a01b2014-06-03 22:04:09 +0200603Fixup:
604 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
605
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100606 return 0;
Linus Torvaldscbd69db2006-06-24 14:50:29 -0700607}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100609static int pci_legacy_resume_early(struct device *dev)
610{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400611 struct pci_dev *pci_dev = to_pci_dev(dev);
612 struct pci_driver *drv = pci_dev->driver;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100613
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +0100614 return drv && drv->resume_early ?
615 drv->resume_early(pci_dev) : 0;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100616}
617
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200618static int pci_legacy_resume(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400620 struct pci_dev *pci_dev = to_pci_dev(dev);
621 struct pci_driver *drv = pci_dev->driver;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100623 pci_fixup_device(pci_fixup_resume, pci_dev);
624
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +0100625 return drv && drv->resume ?
626 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627}
628
Rafael J. Wysocki571ff752009-01-07 13:05:05 +0100629/* Auxiliary functions used by the new power management framework */
630
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100631static void pci_pm_default_resume(struct pci_dev *pci_dev)
Rafael J. Wysocki571ff752009-01-07 13:05:05 +0100632{
Rafael J. Wysocki734104292009-01-07 13:07:15 +0100633 pci_fixup_device(pci_fixup_resume, pci_dev);
634
Yijing Wang326c1cd2014-05-04 12:23:36 +0800635 if (!pci_has_subordinate(pci_dev))
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100636 pci_enable_wake(pci_dev, PCI_D0, false);
Rafael J. Wysocki571ff752009-01-07 13:05:05 +0100637}
638
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100639static void pci_pm_default_suspend(struct pci_dev *pci_dev)
Rafael J. Wysocki734104292009-01-07 13:07:15 +0100640{
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100641 /* Disable non-bridge devices without PM support */
Yijing Wang326c1cd2014-05-04 12:23:36 +0800642 if (!pci_has_subordinate(pci_dev))
Rafael J. Wysockicbbc2f62009-02-04 02:01:15 +0100643 pci_disable_enabled_device(pci_dev);
Rafael J. Wysocki734104292009-01-07 13:07:15 +0100644}
645
Rafael J. Wysocki07e836e2009-01-07 13:06:10 +0100646static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
647{
648 struct pci_driver *drv = pci_dev->driver;
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100649 bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume
Rafael J. Wysocki07e836e2009-01-07 13:06:10 +0100650 || drv->resume_early);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100651
652 /*
653 * Legacy PM support is used by default, so warn if the new framework is
654 * supported as well. Drivers are supposed to support either the
655 * former, or the latter, but not both at the same time.
656 */
David Fries82440a82011-11-20 15:29:46 -0600657 WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n",
658 drv->name, pci_dev->vendor, pci_dev->device);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100659
660 return ret;
Rafael J. Wysocki07e836e2009-01-07 13:06:10 +0100661}
662
Rafael J. Wysocki571ff752009-01-07 13:05:05 +0100663/* New power management framework */
664
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200665static int pci_pm_prepare(struct device *dev)
666{
667 struct device_driver *drv = dev->driver;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200668
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100669 /*
Rafael J. Wysocki7cd06022014-02-26 01:00:30 +0100670 * Devices having power.ignore_children set may still be necessary for
671 * suspending their children in the next phase of device suspend.
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100672 */
Rafael J. Wysocki7cd06022014-02-26 01:00:30 +0100673 if (dev->power.ignore_children)
674 pm_runtime_resume(dev);
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100675
Rafael J. Wysockibac2a902015-01-21 02:17:42 +0100676 if (drv && drv->pm && drv->pm->prepare) {
677 int error = drv->pm->prepare(dev);
678 if (error)
679 return error;
680 }
681 return pci_dev_keep_suspended(to_pci_dev(dev));
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200682}
683
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200684
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100685#else /* !CONFIG_PM_SLEEP */
686
687#define pci_pm_prepare NULL
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100688
689#endif /* !CONFIG_PM_SLEEP */
690
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200691#ifdef CONFIG_SUSPEND
692
693static int pci_pm_suspend(struct device *dev)
694{
695 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700696 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200697
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100698 if (pci_has_legacy_pm_support(pci_dev))
699 return pci_legacy_suspend(dev, PMSG_SUSPEND);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100700
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100701 if (!pm) {
702 pci_pm_default_suspend(pci_dev);
703 goto Fixup;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200704 }
Rafael J. Wysockifa58d302009-01-07 13:03:42 +0100705
Rafael J. Wysocki7cd06022014-02-26 01:00:30 +0100706 /*
707 * PCI devices suspended at run time need to be resumed at this point,
708 * because in general it is necessary to reconfigure them for system
709 * suspend. Namely, if the device is supposed to wake up the system
710 * from the sleep state, we may need to reconfigure it for this purpose.
711 * In turn, if the device is not supposed to wake up the system from the
712 * sleep state, we'll have to prevent it from signaling wake-up.
713 */
714 pm_runtime_resume(dev);
715
Rafael J. Wysocki82fee4d2013-02-04 15:56:05 +0400716 pci_dev->state_saved = false;
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100717 if (pm->suspend) {
718 pci_power_t prev = pci_dev->current_state;
719 int error;
720
721 error = pm->suspend(dev);
722 suspend_report_result(pm->suspend, error);
723 if (error)
724 return error;
725
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100726 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100727 && pci_dev->current_state != PCI_UNKNOWN) {
728 WARN_ONCE(pci_dev->current_state != prev,
729 "PCI PM: State of device not saved by %pF\n",
730 pm->suspend);
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100731 }
732 }
733
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100734 Fixup:
735 pci_fixup_device(pci_fixup_suspend, pci_dev);
736
737 return 0;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200738}
739
740static int pci_pm_suspend_noirq(struct device *dev)
Greg KHc8958172005-04-08 14:53:31 +0900741{
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100742 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700743 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Greg KHc8958172005-04-08 14:53:31 +0900744
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100745 if (pci_has_legacy_pm_support(pci_dev))
746 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
747
Rafael J. Wysocki931ff682009-03-16 22:40:50 +0100748 if (!pm) {
749 pci_save_state(pci_dev);
Andreas Noever7d2a01b2014-06-03 22:04:09 +0200750 goto Fixup;
Rafael J. Wysocki931ff682009-03-16 22:40:50 +0100751 }
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100752
753 if (pm->suspend_noirq) {
754 pci_power_t prev = pci_dev->current_state;
755 int error;
756
757 error = pm->suspend_noirq(dev);
758 suspend_report_result(pm->suspend_noirq, error);
759 if (error)
760 return error;
761
762 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
763 && pci_dev->current_state != PCI_UNKNOWN) {
764 WARN_ONCE(pci_dev->current_state != prev,
765 "PCI PM: State of device not saved by %pF\n",
766 pm->suspend_noirq);
Andreas Noever7d2a01b2014-06-03 22:04:09 +0200767 goto Fixup;
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100768 }
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200769 }
770
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100771 if (!pci_dev->state_saved) {
772 pci_save_state(pci_dev);
Yijing Wang326c1cd2014-05-04 12:23:36 +0800773 if (!pci_has_subordinate(pci_dev))
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100774 pci_prepare_to_sleep(pci_dev);
775 }
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100776
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100777 pci_pm_set_unknown_state(pci_dev);
778
Alan Sterndbf0e4c2012-07-09 11:09:21 -0400779 /*
780 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
781 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
782 * hasn't been quiesced and tries to turn it off. If the controller
783 * is already in D3, this can hang or cause memory corruption.
784 *
785 * Since the value of the COMMAND register doesn't matter once the
786 * device has been suspended, we can safely set it to 0 here.
787 */
788 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
789 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
790
Andreas Noever7d2a01b2014-06-03 22:04:09 +0200791Fixup:
792 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
793
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100794 return 0;
Greg KHc8958172005-04-08 14:53:31 +0900795}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200797static int pci_pm_resume_noirq(struct device *dev)
798{
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100799 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200800 struct device_driver *drv = dev->driver;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200801 int error = 0;
802
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100803 pci_pm_default_resume_early(pci_dev);
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +0100804
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100805 if (pci_has_legacy_pm_support(pci_dev))
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100806 return pci_legacy_resume_early(dev);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100807
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100808 if (drv && drv->pm && drv->pm->resume_noirq)
809 error = drv->pm->resume_noirq(dev);
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200810
811 return error;
812}
813
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100814static int pci_pm_resume(struct device *dev)
815{
816 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700817 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100818 int error = 0;
819
Rafael J. Wysocki418e4da2009-01-26 21:43:08 +0100820 /*
821 * This is necessary for the suspend error path in which resume is
822 * called without restoring the standard config registers of the device.
823 */
824 if (pci_dev->state_saved)
825 pci_restore_standard_config(pci_dev);
826
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100827 if (pci_has_legacy_pm_support(pci_dev))
828 return pci_legacy_resume(dev);
829
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100830 pci_pm_default_resume(pci_dev);
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100831
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100832 if (pm) {
833 if (pm->resume)
834 error = pm->resume(dev);
835 } else {
836 pci_pm_reenable_device(pci_dev);
837 }
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100838
Rafael J. Wysocki999cce42009-09-09 23:51:27 +0200839 return error;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100840}
841
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200842#else /* !CONFIG_SUSPEND */
843
844#define pci_pm_suspend NULL
845#define pci_pm_suspend_noirq NULL
846#define pci_pm_resume NULL
847#define pci_pm_resume_noirq NULL
848
849#endif /* !CONFIG_SUSPEND */
850
Rafael J. Wysocki1f112ce2011-04-11 22:54:42 +0200851#ifdef CONFIG_HIBERNATE_CALLBACKS
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200852
Sebastian Ott699c1982013-08-20 16:41:02 +0200853
854/*
855 * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing
856 * a hibernate transition
857 */
858struct dev_pm_ops __weak pcibios_pm_ops;
859
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200860static int pci_pm_freeze(struct device *dev)
861{
862 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700863 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200864
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100865 if (pci_has_legacy_pm_support(pci_dev))
866 return pci_legacy_suspend(dev, PMSG_FREEZE);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100867
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100868 if (!pm) {
869 pci_pm_default_suspend(pci_dev);
870 return 0;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200871 }
872
Rafael J. Wysocki7cd06022014-02-26 01:00:30 +0100873 /*
874 * This used to be done in pci_pm_prepare() for all devices and some
875 * drivers may depend on it, so do it here. Ideally, runtime-suspended
876 * devices should not be touched during freeze/thaw transitions,
877 * however.
878 */
879 pm_runtime_resume(dev);
880
Rafael J. Wysocki82fee4d2013-02-04 15:56:05 +0400881 pci_dev->state_saved = false;
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100882 if (pm->freeze) {
883 int error;
884
885 error = pm->freeze(dev);
886 suspend_report_result(pm->freeze, error);
887 if (error)
888 return error;
889 }
890
Sebastian Ott699c1982013-08-20 16:41:02 +0200891 if (pcibios_pm_ops.freeze)
892 return pcibios_pm_ops.freeze(dev);
893
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100894 return 0;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200895}
896
897static int pci_pm_freeze_noirq(struct device *dev)
898{
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100899 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200900 struct device_driver *drv = dev->driver;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200901
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100902 if (pci_has_legacy_pm_support(pci_dev))
903 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
904
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100905 if (drv && drv->pm && drv->pm->freeze_noirq) {
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100906 int error;
907
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100908 error = drv->pm->freeze_noirq(dev);
909 suspend_report_result(drv->pm->freeze_noirq, error);
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100910 if (error)
911 return error;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200912 }
913
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100914 if (!pci_dev->state_saved)
915 pci_save_state(pci_dev);
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100916
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100917 pci_pm_set_unknown_state(pci_dev);
918
Sebastian Ott699c1982013-08-20 16:41:02 +0200919 if (pcibios_pm_ops.freeze_noirq)
920 return pcibios_pm_ops.freeze_noirq(dev);
921
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100922 return 0;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200923}
924
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200925static int pci_pm_thaw_noirq(struct device *dev)
926{
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100927 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200928 struct device_driver *drv = dev->driver;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200929 int error = 0;
930
Sebastian Ott699c1982013-08-20 16:41:02 +0200931 if (pcibios_pm_ops.thaw_noirq) {
932 error = pcibios_pm_ops.thaw_noirq(dev);
933 if (error)
934 return error;
935 }
936
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100937 if (pci_has_legacy_pm_support(pci_dev))
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100938 return pci_legacy_resume_early(dev);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100939
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100940 pci_update_current_state(pci_dev, PCI_D0);
941
942 if (drv && drv->pm && drv->pm->thaw_noirq)
943 error = drv->pm->thaw_noirq(dev);
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200944
945 return error;
946}
947
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100948static int pci_pm_thaw(struct device *dev)
949{
950 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700951 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100952 int error = 0;
953
Sebastian Ott699c1982013-08-20 16:41:02 +0200954 if (pcibios_pm_ops.thaw) {
955 error = pcibios_pm_ops.thaw(dev);
956 if (error)
957 return error;
958 }
959
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100960 if (pci_has_legacy_pm_support(pci_dev))
961 return pci_legacy_resume(dev);
962
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100963 if (pm) {
964 if (pm->thaw)
965 error = pm->thaw(dev);
966 } else {
967 pci_pm_reenable_device(pci_dev);
968 }
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100969
Rafael J. Wysocki4b77b0a2009-09-09 23:49:59 +0200970 pci_dev->state_saved = false;
971
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100972 return error;
973}
974
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200975static int pci_pm_poweroff(struct device *dev)
976{
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100977 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700978 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200979
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100980 if (pci_has_legacy_pm_support(pci_dev))
981 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100982
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100983 if (!pm) {
984 pci_pm_default_suspend(pci_dev);
985 goto Fixup;
986 }
987
Rafael J. Wysocki7cd06022014-02-26 01:00:30 +0100988 /* The reason to do that is the same as in pci_pm_suspend(). */
989 pm_runtime_resume(dev);
990
Rafael J. Wysocki82fee4d2013-02-04 15:56:05 +0400991 pci_dev->state_saved = false;
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100992 if (pm->poweroff) {
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100993 int error;
994
Rafael J. Wysockiddb7c9d2009-02-04 01:56:14 +0100995 error = pm->poweroff(dev);
996 suspend_report_result(pm->poweroff, error);
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100997 if (error)
998 return error;
999 }
1000
1001 Fixup:
1002 pci_fixup_device(pci_fixup_suspend, pci_dev);
1003
Sebastian Ott699c1982013-08-20 16:41:02 +02001004 if (pcibios_pm_ops.poweroff)
1005 return pcibios_pm_ops.poweroff(dev);
1006
Rafael J. Wysocki46939f82009-03-16 22:40:26 +01001007 return 0;
1008}
1009
1010static int pci_pm_poweroff_noirq(struct device *dev)
1011{
1012 struct pci_dev *pci_dev = to_pci_dev(dev);
1013 struct device_driver *drv = dev->driver;
1014
1015 if (pci_has_legacy_pm_support(to_pci_dev(dev)))
1016 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
1017
Andreas Noever7d2a01b2014-06-03 22:04:09 +02001018 if (!drv || !drv->pm) {
1019 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
Rafael J. Wysocki46939f82009-03-16 22:40:26 +01001020 return 0;
Andreas Noever7d2a01b2014-06-03 22:04:09 +02001021 }
Rafael J. Wysocki46939f82009-03-16 22:40:26 +01001022
1023 if (drv->pm->poweroff_noirq) {
1024 int error;
1025
1026 error = drv->pm->poweroff_noirq(dev);
1027 suspend_report_result(drv->pm->poweroff_noirq, error);
1028 if (error)
1029 return error;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001030 }
1031
Yijing Wang326c1cd2014-05-04 12:23:36 +08001032 if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev))
Rafael J. Wysocki5294e252009-02-04 02:09:07 +01001033 pci_prepare_to_sleep(pci_dev);
1034
Rafael J. Wysocki0b68c8e2012-08-12 23:26:07 +02001035 /*
1036 * The reason for doing this here is the same as for the analogous code
1037 * in pci_pm_suspend_noirq().
1038 */
1039 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
1040 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
1041
Andreas Noever7d2a01b2014-06-03 22:04:09 +02001042 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1043
Sebastian Ott699c1982013-08-20 16:41:02 +02001044 if (pcibios_pm_ops.poweroff_noirq)
1045 return pcibios_pm_ops.poweroff_noirq(dev);
1046
Rafael J. Wysocki46939f82009-03-16 22:40:26 +01001047 return 0;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001048}
1049
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001050static int pci_pm_restore_noirq(struct device *dev)
1051{
1052 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001053 struct device_driver *drv = dev->driver;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001054 int error = 0;
1055
Sebastian Ott699c1982013-08-20 16:41:02 +02001056 if (pcibios_pm_ops.restore_noirq) {
1057 error = pcibios_pm_ops.restore_noirq(dev);
1058 if (error)
1059 return error;
1060 }
1061
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001062 pci_pm_default_resume_early(pci_dev);
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +01001063
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +01001064 if (pci_has_legacy_pm_support(pci_dev))
Rafael J. Wysockibb808942009-01-07 14:15:17 +01001065 return pci_legacy_resume_early(dev);
Rafael J. Wysockibb808942009-01-07 14:15:17 +01001066
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +01001067 if (drv && drv->pm && drv->pm->restore_noirq)
1068 error = drv->pm->restore_noirq(dev);
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001069
1070 return error;
1071}
1072
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +01001073static int pci_pm_restore(struct device *dev)
1074{
1075 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -07001076 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +01001077 int error = 0;
1078
Sebastian Ott699c1982013-08-20 16:41:02 +02001079 if (pcibios_pm_ops.restore) {
1080 error = pcibios_pm_ops.restore(dev);
1081 if (error)
1082 return error;
1083 }
1084
Rafael J. Wysocki418e4da2009-01-26 21:43:08 +01001085 /*
1086 * This is necessary for the hibernation error path in which restore is
1087 * called without restoring the standard config registers of the device.
1088 */
1089 if (pci_dev->state_saved)
1090 pci_restore_standard_config(pci_dev);
1091
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +01001092 if (pci_has_legacy_pm_support(pci_dev))
1093 return pci_legacy_resume(dev);
1094
Rafael J. Wysocki5294e252009-02-04 02:09:07 +01001095 pci_pm_default_resume(pci_dev);
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +01001096
Rafael J. Wysocki5294e252009-02-04 02:09:07 +01001097 if (pm) {
1098 if (pm->restore)
1099 error = pm->restore(dev);
1100 } else {
1101 pci_pm_reenable_device(pci_dev);
1102 }
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +01001103
1104 return error;
1105}
1106
Rafael J. Wysocki1f112ce2011-04-11 22:54:42 +02001107#else /* !CONFIG_HIBERNATE_CALLBACKS */
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001108
1109#define pci_pm_freeze NULL
1110#define pci_pm_freeze_noirq NULL
1111#define pci_pm_thaw NULL
1112#define pci_pm_thaw_noirq NULL
1113#define pci_pm_poweroff NULL
1114#define pci_pm_poweroff_noirq NULL
1115#define pci_pm_restore NULL
1116#define pci_pm_restore_noirq NULL
1117
Rafael J. Wysocki1f112ce2011-04-11 22:54:42 +02001118#endif /* !CONFIG_HIBERNATE_CALLBACKS */
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001119
Rafael J. Wysockifbb988b2014-11-27 23:16:57 +01001120#ifdef CONFIG_PM
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001121
1122static int pci_pm_runtime_suspend(struct device *dev)
1123{
1124 struct pci_dev *pci_dev = to_pci_dev(dev);
1125 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1126 pci_power_t prev = pci_dev->current_state;
1127 int error;
1128
Huang Ying967577b2012-11-20 16:08:22 +08001129 /*
1130 * If pci_dev->driver is not set (unbound), the device should
1131 * always remain in D0 regardless of the runtime PM status
1132 */
1133 if (!pci_dev->driver)
1134 return 0;
1135
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001136 if (!pm || !pm->runtime_suspend)
1137 return -ENOSYS;
1138
Rafael J. Wysocki82fee4d2013-02-04 15:56:05 +04001139 pci_dev->state_saved = false;
Huang Ying448bd852012-06-23 10:23:51 +08001140 pci_dev->no_d3cold = false;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001141 error = pm->runtime_suspend(dev);
1142 suspend_report_result(pm->runtime_suspend, error);
1143 if (error)
1144 return error;
Huang Ying448bd852012-06-23 10:23:51 +08001145 if (!pci_dev->d3cold_allowed)
1146 pci_dev->no_d3cold = true;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001147
1148 pci_fixup_device(pci_fixup_suspend, pci_dev);
1149
1150 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
1151 && pci_dev->current_state != PCI_UNKNOWN) {
1152 WARN_ONCE(pci_dev->current_state != prev,
1153 "PCI PM: State of device not saved by %pF\n",
1154 pm->runtime_suspend);
1155 return 0;
1156 }
1157
Dave Airlie42eca232012-10-29 17:26:54 -06001158 if (!pci_dev->state_saved) {
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001159 pci_save_state(pci_dev);
Dave Airlie42eca232012-10-29 17:26:54 -06001160 pci_finish_runtime_suspend(pci_dev);
1161 }
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001162
1163 return 0;
1164}
1165
1166static int pci_pm_runtime_resume(struct device *dev)
1167{
Huang Ying448bd852012-06-23 10:23:51 +08001168 int rc;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001169 struct pci_dev *pci_dev = to_pci_dev(dev);
1170 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1171
Huang Ying967577b2012-11-20 16:08:22 +08001172 /*
1173 * If pci_dev->driver is not set (unbound), the device should
1174 * always remain in D0 regardless of the runtime PM status
1175 */
1176 if (!pci_dev->driver)
1177 return 0;
1178
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001179 if (!pm || !pm->runtime_resume)
1180 return -ENOSYS;
1181
Rafael J. Wysockidb288c92012-07-05 15:20:00 -06001182 pci_restore_standard_config(pci_dev);
1183 pci_fixup_device(pci_fixup_resume_early, pci_dev);
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001184 __pci_enable_wake(pci_dev, PCI_D0, true, false);
1185 pci_fixup_device(pci_fixup_resume, pci_dev);
1186
Huang Ying448bd852012-06-23 10:23:51 +08001187 rc = pm->runtime_resume(dev);
1188
1189 pci_dev->runtime_d3cold = false;
1190
1191 return rc;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001192}
1193
1194static int pci_pm_runtime_idle(struct device *dev)
1195{
Huang Ying967577b2012-11-20 16:08:22 +08001196 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001197 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysocki45f0a852013-06-03 21:49:52 +02001198 int ret = 0;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001199
Huang Ying967577b2012-11-20 16:08:22 +08001200 /*
1201 * If pci_dev->driver is not set (unbound), the device should
1202 * always remain in D0 regardless of the runtime PM status
1203 */
1204 if (!pci_dev->driver)
Rafael J. Wysocki45f0a852013-06-03 21:49:52 +02001205 return 0;
Huang Ying967577b2012-11-20 16:08:22 +08001206
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001207 if (!pm)
1208 return -ENOSYS;
1209
Rafael J. Wysocki45f0a852013-06-03 21:49:52 +02001210 if (pm->runtime_idle)
1211 ret = pm->runtime_idle(dev);
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001212
Rafael J. Wysocki45f0a852013-06-03 21:49:52 +02001213 return ret;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001214}
1215
Sachin Kamatf91da042013-10-04 12:04:44 -06001216static const struct dev_pm_ops pci_dev_pm_ops = {
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001217 .prepare = pci_pm_prepare,
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001218 .suspend = pci_pm_suspend,
1219 .resume = pci_pm_resume,
1220 .freeze = pci_pm_freeze,
1221 .thaw = pci_pm_thaw,
1222 .poweroff = pci_pm_poweroff,
1223 .restore = pci_pm_restore,
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001224 .suspend_noirq = pci_pm_suspend_noirq,
1225 .resume_noirq = pci_pm_resume_noirq,
1226 .freeze_noirq = pci_pm_freeze_noirq,
1227 .thaw_noirq = pci_pm_thaw_noirq,
1228 .poweroff_noirq = pci_pm_poweroff_noirq,
1229 .restore_noirq = pci_pm_restore_noirq,
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001230 .runtime_suspend = pci_pm_runtime_suspend,
1231 .runtime_resume = pci_pm_runtime_resume,
1232 .runtime_idle = pci_pm_runtime_idle,
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001233};
1234
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001235#define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001236
Rafael J. Wysockifbb988b2014-11-27 23:16:57 +01001237#else /* !CONFIG_PM */
1238
1239#define pci_pm_runtime_suspend NULL
1240#define pci_pm_runtime_resume NULL
1241#define pci_pm_runtime_idle NULL
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001242
1243#define PCI_PM_OPS_PTR NULL
1244
Rafael J. Wysockifbb988b2014-11-27 23:16:57 +01001245#endif /* !CONFIG_PM */
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001246
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247/**
Laurent riffard863b18f2005-10-27 23:12:54 +02001248 * __pci_register_driver - register a new pci driver
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249 * @drv: the driver structure to register
Laurent riffard863b18f2005-10-27 23:12:54 +02001250 * @owner: owner module of drv
Randy Dunlapf95d8822007-02-10 14:41:56 -08001251 * @mod_name: module name string
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001252 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253 * Adds the driver structure to the list of registered drivers.
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001254 * Returns a negative value on error, otherwise 0.
1255 * If no error occurred, the driver remains registered even if
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256 * no device was claimed during registration.
1257 */
Greg Kroah-Hartman725522b2007-01-15 11:50:02 -08001258int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1259 const char *mod_name)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 /* initialize common driver fields */
1262 drv->driver.name = drv->name;
1263 drv->driver.bus = &pci_bus_type;
Laurent riffard863b18f2005-10-27 23:12:54 +02001264 drv->driver.owner = owner;
Greg Kroah-Hartman725522b2007-01-15 11:50:02 -08001265 drv->driver.mod_name = mod_name;
Alan Cox50b00752006-08-16 17:42:18 +01001266
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001267 spin_lock_init(&drv->dynids.lock);
1268 INIT_LIST_HEAD(&drv->dynids.list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269
1270 /* register with core */
Konstantin Khlebnikovbfb09a82012-08-08 14:47:51 +04001271 return driver_register(&drv->driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -06001273EXPORT_SYMBOL(__pci_register_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274
1275/**
1276 * pci_unregister_driver - unregister a pci driver
1277 * @drv: the driver structure to unregister
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001278 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279 * Deletes the driver structure from the list of registered PCI drivers,
1280 * gives it a chance to clean up by calling its remove() function for
1281 * each device it was responsible for, and marks those devices as
1282 * driverless.
1283 */
1284
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001285void pci_unregister_driver(struct pci_driver *drv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286{
1287 driver_unregister(&drv->driver);
1288 pci_free_dynids(drv);
1289}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -06001290EXPORT_SYMBOL(pci_unregister_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291
1292static struct pci_driver pci_compat_driver = {
1293 .name = "compat"
1294};
1295
1296/**
1297 * pci_dev_driver - get the pci_driver of a device
1298 * @dev: the device to query
1299 *
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001300 * Returns the appropriate pci_driver structure or %NULL if there is no
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301 * registered driver for the device.
1302 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001303struct pci_driver *pci_dev_driver(const struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304{
1305 if (dev->driver)
1306 return dev->driver;
1307 else {
1308 int i;
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001309 for (i = 0; i <= PCI_ROM_RESOURCE; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310 if (dev->resource[i].flags & IORESOURCE_BUSY)
1311 return &pci_compat_driver;
1312 }
1313 return NULL;
1314}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -06001315EXPORT_SYMBOL(pci_dev_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316
1317/**
1318 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319 * @dev: the PCI device structure to match against
Randy Dunlap8f7020d2005-10-23 11:57:38 -07001320 * @drv: the device driver to search for matching PCI device id structures
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001321 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322 * Used by a driver to check whether a PCI device present in the
Randy Dunlap8f7020d2005-10-23 11:57:38 -07001323 * system is in its list of supported devices. Returns the matching
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324 * pci_device_id structure or %NULL if there is no match.
1325 */
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001326static int pci_bus_match(struct device *dev, struct device_driver *drv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327{
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001328 struct pci_dev *pci_dev = to_pci_dev(dev);
Yinghai Lu58d9a382013-01-21 13:20:51 -08001329 struct pci_driver *pci_drv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330 const struct pci_device_id *found_id;
1331
Yinghai Lu58d9a382013-01-21 13:20:51 -08001332 if (!pci_dev->match_driver)
1333 return 0;
1334
1335 pci_drv = to_pci_driver(drv);
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001336 found_id = pci_match_device(pci_drv, pci_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 if (found_id)
1338 return 1;
1339
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001340 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341}
1342
1343/**
1344 * pci_dev_get - increments the reference count of the pci device structure
1345 * @dev: the device being referenced
1346 *
1347 * Each live reference to a device should be refcounted.
1348 *
1349 * Drivers for PCI devices should normally record such references in
1350 * their probe() methods, when they bind to a device, and release
1351 * them by calling pci_dev_put(), in their disconnect() methods.
1352 *
1353 * A pointer to the device with the incremented reference counter is returned.
1354 */
1355struct pci_dev *pci_dev_get(struct pci_dev *dev)
1356{
1357 if (dev)
1358 get_device(&dev->dev);
1359 return dev;
1360}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -06001361EXPORT_SYMBOL(pci_dev_get);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362
1363/**
1364 * pci_dev_put - release a use of the pci device structure
1365 * @dev: device that's been disconnected
1366 *
1367 * Must be called when a user of a device is finished with it. When the last
1368 * user of the device calls this function, the memory of the device is freed.
1369 */
1370void pci_dev_put(struct pci_dev *dev)
1371{
1372 if (dev)
1373 put_device(&dev->dev);
1374}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -06001375EXPORT_SYMBOL(pci_dev_put);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376
Bill Pemberton8ccc9aa2012-11-21 15:34:58 -05001377static int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1378{
1379 struct pci_dev *pdev;
1380
1381 if (!dev)
1382 return -ENODEV;
1383
1384 pdev = to_pci_dev(dev);
Bill Pemberton8ccc9aa2012-11-21 15:34:58 -05001385
1386 if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
1387 return -ENOMEM;
1388
1389 if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
1390 return -ENOMEM;
1391
1392 if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
1393 pdev->subsystem_device))
1394 return -ENOMEM;
1395
1396 if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
1397 return -ENOMEM;
1398
Ricardo Ribalda Delgado145b3fe2014-12-02 17:35:04 +01001399 if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X",
Bill Pemberton8ccc9aa2012-11-21 15:34:58 -05001400 pdev->vendor, pdev->device,
1401 pdev->subsystem_vendor, pdev->subsystem_device,
1402 (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
1403 (u8)(pdev->class)))
1404 return -ENOMEM;
Bjorn Helgaasefdd4072014-04-05 15:08:22 -06001405
Bill Pemberton8ccc9aa2012-11-21 15:34:58 -05001406 return 0;
1407}
1408
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409struct bus_type pci_bus_type = {
1410 .name = "pci",
1411 .match = pci_bus_match,
Kay Sievers312c0042005-11-16 09:00:00 +01001412 .uevent = pci_uevent,
Russell Kingb15d6862006-01-05 14:30:22 +00001413 .probe = pci_device_probe,
1414 .remove = pci_device_remove,
Linus Torvaldscbd69db2006-06-24 14:50:29 -07001415 .shutdown = pci_device_shutdown,
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -07001416 .dev_groups = pci_dev_groups,
Greg Kroah-Hartman0f49ba52013-10-07 14:51:02 -06001417 .bus_groups = pci_bus_groups,
Greg Kroah-Hartman2229c1f2013-10-07 14:51:20 -06001418 .drv_groups = pci_drv_groups,
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001419 .pm = PCI_PM_OPS_PTR,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420};
Ryan Desfossesb7fe9432014-04-25 14:32:25 -06001421EXPORT_SYMBOL(pci_bus_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422
1423static int __init pci_driver_init(void)
1424{
1425 return bus_register(&pci_bus_type);
1426}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427postcore_initcall(pci_driver_init);