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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;
58 int retval;
59
60 dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
61 if (!dynid)
62 return -ENOMEM;
63
64 dynid->id.vendor = vendor;
65 dynid->id.device = device;
66 dynid->id.subvendor = subvendor;
67 dynid->id.subdevice = subdevice;
68 dynid->id.class = class;
69 dynid->id.class_mask = class_mask;
70 dynid->id.driver_data = driver_data;
71
72 spin_lock(&drv->dynids.lock);
73 list_add_tail(&dynid->node, &drv->dynids.list);
74 spin_unlock(&drv->dynids.lock);
75
Tejun Heo9dba9102009-09-03 15:26:36 +090076 retval = driver_attach(&drv->driver);
Tejun Heo9dba9102009-09-03 15:26:36 +090077
78 return retval;
79}
80
81static void pci_free_dynids(struct pci_driver *drv)
82{
83 struct pci_dynid *dynid, *n;
84
85 spin_lock(&drv->dynids.lock);
86 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
87 list_del(&dynid->node);
88 kfree(dynid);
89 }
90 spin_unlock(&drv->dynids.lock);
91}
92
Tejun Heo9dba9102009-09-03 15:26:36 +090093/**
94 * store_new_id - sysfs frontend to pci_add_dynid()
Randy Dunlap8f7020d2005-10-23 11:57:38 -070095 * @driver: target device driver
96 * @buf: buffer for scanning device ID data
97 * @count: input size
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 *
Tejun Heo9dba9102009-09-03 15:26:36 +090099 * Allow PCI IDs to be added to an existing driver via sysfs.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 */
Randy Dunlapf8eb1002005-10-28 20:36:51 -0700101static ssize_t
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102store_new_id(struct device_driver *driver, const char *buf, size_t count)
103{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 struct pci_driver *pdrv = to_pci_driver(driver);
Jean Delvareb41d6cf2008-08-17 21:06:59 +0200105 const struct pci_device_id *ids = pdrv->id_table;
Jean Delvare6ba18632007-04-07 17:21:28 +0200106 __u32 vendor, device, subvendor=PCI_ANY_ID,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 subdevice=PCI_ANY_ID, class=0, class_mask=0;
108 unsigned long driver_data=0;
109 int fields=0;
Bandan Das8895d3b2014-04-01 21:32:59 -0400110 int retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
Jean Delvareb41d6cf2008-08-17 21:06:59 +0200112 fields = sscanf(buf, "%x %x %x %x %x %x %lx",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 &vendor, &device, &subvendor, &subdevice,
114 &class, &class_mask, &driver_data);
Jean Delvare6ba18632007-04-07 17:21:28 +0200115 if (fields < 2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 return -EINVAL;
117
Bandan Das8895d3b2014-04-01 21:32:59 -0400118 if (fields != 7) {
119 struct pci_dev *pdev = kzalloc(sizeof(*pdev), GFP_KERNEL);
120 if (!pdev)
121 return -ENOMEM;
122
123 pdev->vendor = vendor;
124 pdev->device = device;
125 pdev->subsystem_vendor = subvendor;
126 pdev->subsystem_device = subdevice;
127 pdev->class = class;
128
129 if (pci_match_id(pdrv->id_table, pdev))
130 retval = -EEXIST;
131
132 kfree(pdev);
133
134 if (retval)
135 return retval;
136 }
137
Jean Delvareb41d6cf2008-08-17 21:06:59 +0200138 /* Only accept driver_data values that match an existing id_table
139 entry */
Chris Wright2debb4d2008-11-25 19:36:10 -0800140 if (ids) {
141 retval = -EINVAL;
142 while (ids->vendor || ids->subvendor || ids->class_mask) {
143 if (driver_data == ids->driver_data) {
144 retval = 0;
145 break;
146 }
147 ids++;
Jean Delvareb41d6cf2008-08-17 21:06:59 +0200148 }
Chris Wright2debb4d2008-11-25 19:36:10 -0800149 if (retval) /* No match */
150 return retval;
Jean Delvareb41d6cf2008-08-17 21:06:59 +0200151 }
Jean Delvareb41d6cf2008-08-17 21:06:59 +0200152
Tejun Heo9dba9102009-09-03 15:26:36 +0900153 retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice,
154 class, class_mask, driver_data);
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700155 if (retval)
156 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 return count;
158}
Greg Kroah-Hartman2229c1f2013-10-07 14:51:20 -0600159static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
Chris Wright09943752009-02-23 21:52:23 -0800161/**
162 * store_remove_id - remove a PCI device ID from this driver
163 * @driver: target device driver
164 * @buf: buffer for scanning device ID data
165 * @count: input size
166 *
167 * Removes a dynamic pci device ID to this driver.
168 */
169static ssize_t
170store_remove_id(struct device_driver *driver, const char *buf, size_t count)
171{
172 struct pci_dynid *dynid, *n;
173 struct pci_driver *pdrv = to_pci_driver(driver);
174 __u32 vendor, device, subvendor = PCI_ANY_ID,
175 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
176 int fields = 0;
177 int retval = -ENODEV;
178
179 fields = sscanf(buf, "%x %x %x %x %x %x",
180 &vendor, &device, &subvendor, &subdevice,
181 &class, &class_mask);
182 if (fields < 2)
183 return -EINVAL;
184
185 spin_lock(&pdrv->dynids.lock);
186 list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) {
187 struct pci_device_id *id = &dynid->id;
188 if ((id->vendor == vendor) &&
189 (id->device == device) &&
190 (subvendor == PCI_ANY_ID || id->subvendor == subvendor) &&
191 (subdevice == PCI_ANY_ID || id->subdevice == subdevice) &&
192 !((id->class ^ class) & class_mask)) {
193 list_del(&dynid->node);
194 kfree(dynid);
195 retval = 0;
196 break;
197 }
198 }
199 spin_unlock(&pdrv->dynids.lock);
200
201 if (retval)
202 return retval;
203 return count;
204}
Greg Kroah-Hartman2229c1f2013-10-07 14:51:20 -0600205static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id);
Chris Wright09943752009-02-23 21:52:23 -0800206
Greg Kroah-Hartman2229c1f2013-10-07 14:51:20 -0600207static struct attribute *pci_drv_attrs[] = {
208 &driver_attr_new_id.attr,
209 &driver_attr_remove_id.attr,
210 NULL,
Konstantin Khlebnikovbfb09a82012-08-08 14:47:51 +0400211};
Greg Kroah-Hartman2229c1f2013-10-07 14:51:20 -0600212ATTRIBUTE_GROUPS(pci_drv);
Alan Sterned283e92012-01-24 14:35:13 -0500213
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214/**
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700215 * pci_match_id - See if a pci device matches a given pci_id table
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 * @ids: array of PCI device id structures to search in
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700217 * @dev: the PCI device structure to match against.
218 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 * Used by a driver to check whether a PCI device present in the
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700220 * system is in its list of supported devices. Returns the matching
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 * pci_device_id structure or %NULL if there is no match.
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700222 *
Randy Dunlap8b607562007-05-09 07:19:14 +0200223 * Deprecated, don't use this as it will not catch any dynamic ids
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700224 * that a driver might want to check for.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 */
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700226const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
227 struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228{
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700229 if (ids) {
230 while (ids->vendor || ids->subvendor || ids->class_mask) {
231 if (pci_match_one_device(ids, dev))
232 return ids;
233 ids++;
234 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 }
236 return NULL;
237}
238
239/**
Randy Dunlapae9608a2007-01-09 21:41:01 -0800240 * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700241 * @drv: the PCI driver to match against
Henrik Kretzschmar39ba4872006-08-15 10:57:16 +0200242 * @dev: the PCI device structure to match against
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700243 *
244 * Used by a driver to check whether a PCI device present in the
245 * system is in its list of supported devices. Returns the matching
246 * pci_device_id structure or %NULL if there is no match.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 */
Adrian Bunkd73460d2007-10-24 18:27:18 +0200248static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
249 struct pci_dev *dev)
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700250{
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700251 struct pci_dynid *dynid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
Russell King7461b602006-11-29 21:18:04 +0000253 /* Look at the dynamic ids first, before the static ones */
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700254 spin_lock(&drv->dynids.lock);
255 list_for_each_entry(dynid, &drv->dynids.list, node) {
256 if (pci_match_one_device(&dynid->id, dev)) {
257 spin_unlock(&drv->dynids.lock);
258 return &dynid->id;
259 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 }
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700261 spin_unlock(&drv->dynids.lock);
Russell King7461b602006-11-29 21:18:04 +0000262
263 return pci_match_id(drv->id_table, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264}
265
Rusty Russell873392c2008-12-31 23:54:56 +1030266struct drv_dev_and_id {
267 struct pci_driver *drv;
268 struct pci_dev *dev;
269 const struct pci_device_id *id;
270};
271
272static long local_pci_probe(void *_ddi)
273{
274 struct drv_dev_and_id *ddi = _ddi;
Huang Ying967577b2012-11-20 16:08:22 +0800275 struct pci_dev *pci_dev = ddi->dev;
276 struct pci_driver *pci_drv = ddi->drv;
277 struct device *dev = &pci_dev->dev;
Alan Sternf3ec4f82010-06-08 15:23:51 -0400278 int rc;
Rusty Russell873392c2008-12-31 23:54:56 +1030279
Huang Ying967577b2012-11-20 16:08:22 +0800280 /*
281 * Unbound PCI devices are always put in D0, regardless of
282 * runtime PM status. During probe, the device is set to
283 * active and the usage count is incremented. If the driver
284 * supports runtime PM, it should call pm_runtime_put_noidle()
285 * in its probe routine and pm_runtime_get_noresume() in its
286 * remove routine.
Alan Sternf3ec4f82010-06-08 15:23:51 -0400287 */
Huang Ying967577b2012-11-20 16:08:22 +0800288 pm_runtime_get_sync(dev);
289 pci_dev->driver = pci_drv;
290 rc = pci_drv->probe(pci_dev, ddi->id);
Stephen M. Cameronf92d74c2013-11-01 14:34:55 -0500291 if (!rc)
292 return rc;
293 if (rc < 0) {
Huang Ying967577b2012-11-20 16:08:22 +0800294 pci_dev->driver = NULL;
295 pm_runtime_put_sync(dev);
Stephen M. Cameronf92d74c2013-11-01 14:34:55 -0500296 return rc;
Alan Sternf3ec4f82010-06-08 15:23:51 -0400297 }
Stephen M. Cameronf92d74c2013-11-01 14:34:55 -0500298 /*
299 * Probe function should return < 0 for failure, 0 for success
300 * Treat values > 0 as success, but warn.
301 */
302 dev_warn(dev, "Driver probe function unexpectedly returned %d\n", rc);
303 return 0;
Rusty Russell873392c2008-12-31 23:54:56 +1030304}
305
Andi Kleend42c6992005-07-06 19:56:03 +0200306static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
307 const struct pci_device_id *id)
308{
Rusty Russell873392c2008-12-31 23:54:56 +1030309 int error, node;
310 struct drv_dev_and_id ddi = { drv, dev, id };
Mike Travisf70316d2008-04-04 18:11:06 -0700311
Alexander Duyck12c31562013-11-18 10:59:59 -0700312 /*
313 * Execute driver initialization on node where the device is
314 * attached. This way the driver likely allocates its local memory
315 * on the right node.
316 */
Rusty Russell873392c2008-12-31 23:54:56 +1030317 node = dev_to_node(&dev->dev);
Alexander Duyck12c31562013-11-18 10:59:59 -0700318
319 /*
320 * On NUMA systems, we are likely to call a PF probe function using
321 * work_on_cpu(). If that probe calls pci_enable_sriov() (which
322 * adds the VF devices via pci_bus_add_device()), we may re-enter
323 * this function to call the VF probe function. Calling
324 * work_on_cpu() again will cause a lockdep warning. Since VFs are
325 * always on the same node as the PF, we can work around this by
326 * avoiding work_on_cpu() when we're already on the correct node.
327 *
328 * Preemption is enabled, so it's theoretically unsafe to use
329 * numa_node_id(), but even if we run the probe function on the
330 * wrong node, it should be functionally correct.
331 */
332 if (node >= 0 && node != numa_node_id()) {
Rusty Russell873392c2008-12-31 23:54:56 +1030333 int cpu;
Rusty Russell873392c2008-12-31 23:54:56 +1030334
335 get_online_cpus();
Rusty Russella70f7302009-03-13 14:49:46 +1030336 cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask);
Rusty Russell873392c2008-12-31 23:54:56 +1030337 if (cpu < nr_cpu_ids)
338 error = work_on_cpu(cpu, local_pci_probe, &ddi);
339 else
340 error = local_pci_probe(&ddi);
341 put_online_cpus();
342 } else
343 error = local_pci_probe(&ddi);
Alexander Duyck12c31562013-11-18 10:59:59 -0700344
Andi Kleend42c6992005-07-06 19:56:03 +0200345 return error;
346}
347
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348/**
Randy Dunlap23ea3792010-11-18 15:02:31 -0800349 * __pci_device_probe - check if a driver wants to claim a specific PCI device
Randy Dunlap8f7020d2005-10-23 11:57:38 -0700350 * @drv: driver to call to check if it wants the PCI device
351 * @pci_dev: PCI device being probed
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700352 *
Randy Dunlap8f7020d2005-10-23 11:57:38 -0700353 * returns 0 on success, else error.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
355 */
356static int
357__pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700358{
359 const struct pci_device_id *id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 int error = 0;
361
362 if (!pci_dev->driver && drv->probe) {
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700363 error = -ENODEV;
364
365 id = pci_match_device(drv, pci_dev);
366 if (id)
Andi Kleend42c6992005-07-06 19:56:03 +0200367 error = pci_call_probe(drv, pci_dev, id);
Huang Ying967577b2012-11-20 16:08:22 +0800368 if (error >= 0)
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700369 error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 }
371 return error;
372}
373
374static int pci_device_probe(struct device * dev)
375{
376 int error = 0;
377 struct pci_driver *drv;
378 struct pci_dev *pci_dev;
379
380 drv = to_pci_driver(dev->driver);
381 pci_dev = to_pci_dev(dev);
382 pci_dev_get(pci_dev);
383 error = __pci_device_probe(drv, pci_dev);
384 if (error)
385 pci_dev_put(pci_dev);
386
387 return error;
388}
389
390static int pci_device_remove(struct device * dev)
391{
392 struct pci_dev * pci_dev = to_pci_dev(dev);
393 struct pci_driver * drv = pci_dev->driver;
394
395 if (drv) {
Alan Sternf3ec4f82010-06-08 15:23:51 -0400396 if (drv->remove) {
397 pm_runtime_get_sync(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 drv->remove(pci_dev);
Alan Sternf3ec4f82010-06-08 15:23:51 -0400399 pm_runtime_put_noidle(dev);
400 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 pci_dev->driver = NULL;
402 }
403
Alan Sternf3ec4f82010-06-08 15:23:51 -0400404 /* Undo the runtime PM settings in local_pci_probe() */
Huang Ying967577b2012-11-20 16:08:22 +0800405 pm_runtime_put_sync(dev);
Alan Sternf3ec4f82010-06-08 15:23:51 -0400406
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 /*
Shaohua Li2449e062006-10-20 14:45:32 -0700408 * If the device is still on, set the power state as "unknown",
409 * since it might change by the next time we load the driver.
410 */
411 if (pci_dev->current_state == PCI_D0)
412 pci_dev->current_state = PCI_UNKNOWN;
413
414 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 * We would love to complain here if pci_dev->is_enabled is set, that
416 * the driver should have called pci_disable_device(), but the
417 * unfortunate fact is there are too many odd BIOS and bridge setups
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700418 * that don't like drivers doing that all of the time.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 * Oh well, we can dream of sane hardware when we sleep, no matter how
420 * horrible the crap we have to deal with is when we are awake...
421 */
422
423 pci_dev_put(pci_dev);
424 return 0;
425}
426
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200427static void pci_device_shutdown(struct device *dev)
428{
429 struct pci_dev *pci_dev = to_pci_dev(dev);
430 struct pci_driver *drv = pci_dev->driver;
431
Huang Ying3ff2de92012-10-24 14:54:14 +0800432 pm_runtime_resume(dev);
433
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200434 if (drv && drv->shutdown)
435 drv->shutdown(pci_dev);
436 pci_msi_shutdown(pci_dev);
437 pci_msix_shutdown(pci_dev);
Rafael J. Wysocki5b415f12012-02-07 00:50:35 +0100438
Khalid Aziz4fc9bbf2013-11-27 15:19:25 -0700439#ifdef CONFIG_KEXEC
Rafael J. Wysocki5b415f12012-02-07 00:50:35 +0100440 /*
Khalid Aziz4fc9bbf2013-11-27 15:19:25 -0700441 * If this is a kexec reboot, turn off Bus Master bit on the
442 * device to tell it to not continue to do DMA. Don't touch
443 * devices in D3cold or unknown states.
444 * If it is not a kexec reboot, firmware will hit the PCI
445 * devices with big hammer and stop their DMA any way.
Khalid Azizb566a222012-04-27 13:00:33 -0600446 */
Khalid Aziz4fc9bbf2013-11-27 15:19:25 -0700447 if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
Konstantin Khlebnikov6e0eda32013-03-14 18:49:37 +0400448 pci_clear_master(pci_dev);
Khalid Aziz4fc9bbf2013-11-27 15:19:25 -0700449#endif
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200450}
451
Rafael J. Wysockiaa338602011-02-11 00:06:54 +0100452#ifdef CONFIG_PM
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100453
454/* Auxiliary functions used for system resume and run-time resume. */
455
456/**
457 * pci_restore_standard_config - restore standard config registers of PCI device
458 * @pci_dev: PCI device to handle
459 */
460static int pci_restore_standard_config(struct pci_dev *pci_dev)
461{
462 pci_update_current_state(pci_dev, PCI_UNKNOWN);
463
464 if (pci_dev->current_state != PCI_D0) {
465 int error = pci_set_power_state(pci_dev, PCI_D0);
466 if (error)
467 return error;
468 }
469
Jon Mason1d3c16a2010-11-30 17:43:26 -0600470 pci_restore_state(pci_dev);
471 return 0;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100472}
473
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100474#endif
475
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200476#ifdef CONFIG_PM_SLEEP
477
Rafael J. Wysockidb288c92012-07-05 15:20:00 -0600478static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
479{
480 pci_power_up(pci_dev);
481 pci_restore_state(pci_dev);
482 pci_fixup_device(pci_fixup_resume_early, pci_dev);
483}
484
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200485/*
486 * Default "suspend" method for devices that have no driver provided suspend,
Rafael J. Wysockifa58d302009-01-07 13:03:42 +0100487 * or not even a driver at all (second part).
488 */
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100489static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200490{
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200491 /*
492 * mark its power state as "unknown", since we don't know if
493 * e.g. the BIOS will change its device state when we suspend.
494 */
495 if (pci_dev->current_state == PCI_D0)
496 pci_dev->current_state = PCI_UNKNOWN;
497}
498
499/*
500 * Default "resume" method for devices that have no driver provided resume,
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100501 * or not even a driver at all (second part).
502 */
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100503static int pci_pm_reenable_device(struct pci_dev *pci_dev)
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100504{
505 int retval;
506
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200507 /* if the device was enabled before suspend, reenable */
508 retval = pci_reenable_device(pci_dev);
509 /*
510 * if the device was busmaster before the suspend, make it busmaster
511 * again
512 */
513 if (pci_dev->is_busmaster)
514 pci_set_master(pci_dev);
515
516 return retval;
517}
518
519static int pci_legacy_suspend(struct device *dev, pm_message_t state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520{
521 struct pci_dev * pci_dev = to_pci_dev(dev);
522 struct pci_driver * drv = pci_dev->driver;
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100523
Andrew Morton02669492006-03-23 01:38:34 -0800524 if (drv && drv->suspend) {
Rafael J. Wysocki99dadce2009-02-04 01:59:09 +0100525 pci_power_t prev = pci_dev->current_state;
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100526 int error;
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +0100527
Frans Pop57ef8022009-03-16 22:39:56 +0100528 error = drv->suspend(pci_dev, state);
529 suspend_report_result(drv->suspend, error);
530 if (error)
531 return error;
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +0100532
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100533 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
Rafael J. Wysocki99dadce2009-02-04 01:59:09 +0100534 && pci_dev->current_state != PCI_UNKNOWN) {
535 WARN_ONCE(pci_dev->current_state != prev,
536 "PCI PM: Device state not saved by %pF\n",
537 drv->suspend);
Rafael J. Wysocki99dadce2009-02-04 01:59:09 +0100538 }
Andrew Morton02669492006-03-23 01:38:34 -0800539 }
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100540
541 pci_fixup_device(pci_fixup_suspend, pci_dev);
542
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100543 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544}
545
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200546static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
Linus Torvaldscbd69db2006-06-24 14:50:29 -0700547{
548 struct pci_dev * pci_dev = to_pci_dev(dev);
549 struct pci_driver * drv = pci_dev->driver;
Linus Torvaldscbd69db2006-06-24 14:50:29 -0700550
551 if (drv && drv->suspend_late) {
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100552 pci_power_t prev = pci_dev->current_state;
553 int error;
554
Frans Pop57ef8022009-03-16 22:39:56 +0100555 error = drv->suspend_late(pci_dev, state);
556 suspend_report_result(drv->suspend_late, error);
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100557 if (error)
558 return error;
559
560 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
561 && pci_dev->current_state != PCI_UNKNOWN) {
562 WARN_ONCE(pci_dev->current_state != prev,
563 "PCI PM: Device state not saved by %pF\n",
564 drv->suspend_late);
565 return 0;
566 }
Linus Torvaldscbd69db2006-06-24 14:50:29 -0700567 }
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100568
569 if (!pci_dev->state_saved)
570 pci_save_state(pci_dev);
571
572 pci_pm_set_unknown_state(pci_dev);
573
574 return 0;
Linus Torvaldscbd69db2006-06-24 14:50:29 -0700575}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100577static int pci_legacy_resume_early(struct device *dev)
578{
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100579 struct pci_dev * pci_dev = to_pci_dev(dev);
580 struct pci_driver * drv = pci_dev->driver;
581
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +0100582 return drv && drv->resume_early ?
583 drv->resume_early(pci_dev) : 0;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100584}
585
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200586static int pci_legacy_resume(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587{
588 struct pci_dev * pci_dev = to_pci_dev(dev);
589 struct pci_driver * drv = pci_dev->driver;
590
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100591 pci_fixup_device(pci_fixup_resume, pci_dev);
592
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +0100593 return drv && drv->resume ?
594 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595}
596
Rafael J. Wysocki571ff752009-01-07 13:05:05 +0100597/* Auxiliary functions used by the new power management framework */
598
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100599static void pci_pm_default_resume(struct pci_dev *pci_dev)
Rafael J. Wysocki571ff752009-01-07 13:05:05 +0100600{
Rafael J. Wysocki734104292009-01-07 13:07:15 +0100601 pci_fixup_device(pci_fixup_resume, pci_dev);
602
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100603 if (!pci_is_bridge(pci_dev))
604 pci_enable_wake(pci_dev, PCI_D0, false);
Rafael J. Wysocki571ff752009-01-07 13:05:05 +0100605}
606
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100607static void pci_pm_default_suspend(struct pci_dev *pci_dev)
Rafael J. Wysocki734104292009-01-07 13:07:15 +0100608{
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100609 /* Disable non-bridge devices without PM support */
Rafael J. Wysockicbbc2f62009-02-04 02:01:15 +0100610 if (!pci_is_bridge(pci_dev))
611 pci_disable_enabled_device(pci_dev);
Rafael J. Wysocki734104292009-01-07 13:07:15 +0100612}
613
Rafael J. Wysocki07e836e2009-01-07 13:06:10 +0100614static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
615{
616 struct pci_driver *drv = pci_dev->driver;
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100617 bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume
Rafael J. Wysocki07e836e2009-01-07 13:06:10 +0100618 || drv->resume_early);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100619
620 /*
621 * Legacy PM support is used by default, so warn if the new framework is
622 * supported as well. Drivers are supposed to support either the
623 * former, or the latter, but not both at the same time.
624 */
David Fries82440a82011-11-20 15:29:46 -0600625 WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n",
626 drv->name, pci_dev->vendor, pci_dev->device);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100627
628 return ret;
Rafael J. Wysocki07e836e2009-01-07 13:06:10 +0100629}
630
Rafael J. Wysocki571ff752009-01-07 13:05:05 +0100631/* New power management framework */
632
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200633static int pci_pm_prepare(struct device *dev)
634{
635 struct device_driver *drv = dev->driver;
636 int error = 0;
637
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100638 /*
Rafael J. Wysocki7cd06022014-02-26 01:00:30 +0100639 * Devices having power.ignore_children set may still be necessary for
640 * suspending their children in the next phase of device suspend.
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100641 */
Rafael J. Wysocki7cd06022014-02-26 01:00:30 +0100642 if (dev->power.ignore_children)
643 pm_runtime_resume(dev);
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100644
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200645 if (drv && drv->pm && drv->pm->prepare)
646 error = drv->pm->prepare(dev);
647
648 return error;
649}
650
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200651
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100652#else /* !CONFIG_PM_SLEEP */
653
654#define pci_pm_prepare NULL
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100655
656#endif /* !CONFIG_PM_SLEEP */
657
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200658#ifdef CONFIG_SUSPEND
659
660static int pci_pm_suspend(struct device *dev)
661{
662 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700663 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200664
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100665 if (pci_has_legacy_pm_support(pci_dev))
666 return pci_legacy_suspend(dev, PMSG_SUSPEND);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100667
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100668 if (!pm) {
669 pci_pm_default_suspend(pci_dev);
670 goto Fixup;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200671 }
Rafael J. Wysockifa58d302009-01-07 13:03:42 +0100672
Rafael J. Wysocki7cd06022014-02-26 01:00:30 +0100673 /*
674 * PCI devices suspended at run time need to be resumed at this point,
675 * because in general it is necessary to reconfigure them for system
676 * suspend. Namely, if the device is supposed to wake up the system
677 * from the sleep state, we may need to reconfigure it for this purpose.
678 * In turn, if the device is not supposed to wake up the system from the
679 * sleep state, we'll have to prevent it from signaling wake-up.
680 */
681 pm_runtime_resume(dev);
682
Rafael J. Wysocki82fee4d2013-02-04 15:56:05 +0400683 pci_dev->state_saved = false;
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100684 if (pm->suspend) {
685 pci_power_t prev = pci_dev->current_state;
686 int error;
687
688 error = pm->suspend(dev);
689 suspend_report_result(pm->suspend, error);
690 if (error)
691 return error;
692
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100693 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100694 && pci_dev->current_state != PCI_UNKNOWN) {
695 WARN_ONCE(pci_dev->current_state != prev,
696 "PCI PM: State of device not saved by %pF\n",
697 pm->suspend);
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100698 }
699 }
700
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100701 Fixup:
702 pci_fixup_device(pci_fixup_suspend, pci_dev);
703
704 return 0;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200705}
706
707static int pci_pm_suspend_noirq(struct device *dev)
Greg KHc8958172005-04-08 14:53:31 +0900708{
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100709 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700710 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Greg KHc8958172005-04-08 14:53:31 +0900711
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100712 if (pci_has_legacy_pm_support(pci_dev))
713 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
714
Rafael J. Wysocki931ff682009-03-16 22:40:50 +0100715 if (!pm) {
716 pci_save_state(pci_dev);
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100717 return 0;
Rafael J. Wysocki931ff682009-03-16 22:40:50 +0100718 }
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100719
720 if (pm->suspend_noirq) {
721 pci_power_t prev = pci_dev->current_state;
722 int error;
723
724 error = pm->suspend_noirq(dev);
725 suspend_report_result(pm->suspend_noirq, error);
726 if (error)
727 return error;
728
729 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
730 && pci_dev->current_state != PCI_UNKNOWN) {
731 WARN_ONCE(pci_dev->current_state != prev,
732 "PCI PM: State of device not saved by %pF\n",
733 pm->suspend_noirq);
734 return 0;
735 }
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200736 }
737
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100738 if (!pci_dev->state_saved) {
739 pci_save_state(pci_dev);
740 if (!pci_is_bridge(pci_dev))
741 pci_prepare_to_sleep(pci_dev);
742 }
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100743
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100744 pci_pm_set_unknown_state(pci_dev);
745
Alan Sterndbf0e4c2012-07-09 11:09:21 -0400746 /*
747 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
748 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
749 * hasn't been quiesced and tries to turn it off. If the controller
750 * is already in D3, this can hang or cause memory corruption.
751 *
752 * Since the value of the COMMAND register doesn't matter once the
753 * device has been suspended, we can safely set it to 0 here.
754 */
755 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
756 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
757
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100758 return 0;
Greg KHc8958172005-04-08 14:53:31 +0900759}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200761static int pci_pm_resume_noirq(struct device *dev)
762{
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100763 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200764 struct device_driver *drv = dev->driver;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200765 int error = 0;
766
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100767 pci_pm_default_resume_early(pci_dev);
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +0100768
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100769 if (pci_has_legacy_pm_support(pci_dev))
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100770 return pci_legacy_resume_early(dev);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100771
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100772 if (drv && drv->pm && drv->pm->resume_noirq)
773 error = drv->pm->resume_noirq(dev);
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200774
775 return error;
776}
777
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100778static int pci_pm_resume(struct device *dev)
779{
780 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700781 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100782 int error = 0;
783
Rafael J. Wysocki418e4da2009-01-26 21:43:08 +0100784 /*
785 * This is necessary for the suspend error path in which resume is
786 * called without restoring the standard config registers of the device.
787 */
788 if (pci_dev->state_saved)
789 pci_restore_standard_config(pci_dev);
790
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100791 if (pci_has_legacy_pm_support(pci_dev))
792 return pci_legacy_resume(dev);
793
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100794 pci_pm_default_resume(pci_dev);
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100795
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100796 if (pm) {
797 if (pm->resume)
798 error = pm->resume(dev);
799 } else {
800 pci_pm_reenable_device(pci_dev);
801 }
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100802
Rafael J. Wysocki999cce42009-09-09 23:51:27 +0200803 return error;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100804}
805
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200806#else /* !CONFIG_SUSPEND */
807
808#define pci_pm_suspend NULL
809#define pci_pm_suspend_noirq NULL
810#define pci_pm_resume NULL
811#define pci_pm_resume_noirq NULL
812
813#endif /* !CONFIG_SUSPEND */
814
Rafael J. Wysocki1f112ce2011-04-11 22:54:42 +0200815#ifdef CONFIG_HIBERNATE_CALLBACKS
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200816
Sebastian Ott699c1982013-08-20 16:41:02 +0200817
818/*
819 * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing
820 * a hibernate transition
821 */
822struct dev_pm_ops __weak pcibios_pm_ops;
823
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200824static int pci_pm_freeze(struct device *dev)
825{
826 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700827 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200828
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100829 if (pci_has_legacy_pm_support(pci_dev))
830 return pci_legacy_suspend(dev, PMSG_FREEZE);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100831
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100832 if (!pm) {
833 pci_pm_default_suspend(pci_dev);
834 return 0;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200835 }
836
Rafael J. Wysocki7cd06022014-02-26 01:00:30 +0100837 /*
838 * This used to be done in pci_pm_prepare() for all devices and some
839 * drivers may depend on it, so do it here. Ideally, runtime-suspended
840 * devices should not be touched during freeze/thaw transitions,
841 * however.
842 */
843 pm_runtime_resume(dev);
844
Rafael J. Wysocki82fee4d2013-02-04 15:56:05 +0400845 pci_dev->state_saved = false;
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100846 if (pm->freeze) {
847 int error;
848
849 error = pm->freeze(dev);
850 suspend_report_result(pm->freeze, error);
851 if (error)
852 return error;
853 }
854
Sebastian Ott699c1982013-08-20 16:41:02 +0200855 if (pcibios_pm_ops.freeze)
856 return pcibios_pm_ops.freeze(dev);
857
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100858 return 0;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200859}
860
861static int pci_pm_freeze_noirq(struct device *dev)
862{
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100863 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200864 struct device_driver *drv = dev->driver;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200865
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100866 if (pci_has_legacy_pm_support(pci_dev))
867 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
868
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100869 if (drv && drv->pm && drv->pm->freeze_noirq) {
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100870 int error;
871
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100872 error = drv->pm->freeze_noirq(dev);
873 suspend_report_result(drv->pm->freeze_noirq, error);
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100874 if (error)
875 return error;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200876 }
877
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100878 if (!pci_dev->state_saved)
879 pci_save_state(pci_dev);
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100880
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100881 pci_pm_set_unknown_state(pci_dev);
882
Sebastian Ott699c1982013-08-20 16:41:02 +0200883 if (pcibios_pm_ops.freeze_noirq)
884 return pcibios_pm_ops.freeze_noirq(dev);
885
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100886 return 0;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200887}
888
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200889static int pci_pm_thaw_noirq(struct device *dev)
890{
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100891 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200892 struct device_driver *drv = dev->driver;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200893 int error = 0;
894
Sebastian Ott699c1982013-08-20 16:41:02 +0200895 if (pcibios_pm_ops.thaw_noirq) {
896 error = pcibios_pm_ops.thaw_noirq(dev);
897 if (error)
898 return error;
899 }
900
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100901 if (pci_has_legacy_pm_support(pci_dev))
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100902 return pci_legacy_resume_early(dev);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100903
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100904 pci_update_current_state(pci_dev, PCI_D0);
905
906 if (drv && drv->pm && drv->pm->thaw_noirq)
907 error = drv->pm->thaw_noirq(dev);
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200908
909 return error;
910}
911
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100912static int pci_pm_thaw(struct device *dev)
913{
914 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700915 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100916 int error = 0;
917
Sebastian Ott699c1982013-08-20 16:41:02 +0200918 if (pcibios_pm_ops.thaw) {
919 error = pcibios_pm_ops.thaw(dev);
920 if (error)
921 return error;
922 }
923
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100924 if (pci_has_legacy_pm_support(pci_dev))
925 return pci_legacy_resume(dev);
926
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100927 if (pm) {
928 if (pm->thaw)
929 error = pm->thaw(dev);
930 } else {
931 pci_pm_reenable_device(pci_dev);
932 }
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100933
Rafael J. Wysocki4b77b0a2009-09-09 23:49:59 +0200934 pci_dev->state_saved = false;
935
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100936 return error;
937}
938
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200939static int pci_pm_poweroff(struct device *dev)
940{
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100941 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700942 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200943
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100944 if (pci_has_legacy_pm_support(pci_dev))
945 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100946
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100947 if (!pm) {
948 pci_pm_default_suspend(pci_dev);
949 goto Fixup;
950 }
951
Rafael J. Wysocki7cd06022014-02-26 01:00:30 +0100952 /* The reason to do that is the same as in pci_pm_suspend(). */
953 pm_runtime_resume(dev);
954
Rafael J. Wysocki82fee4d2013-02-04 15:56:05 +0400955 pci_dev->state_saved = false;
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100956 if (pm->poweroff) {
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100957 int error;
958
Rafael J. Wysockiddb7c9d2009-02-04 01:56:14 +0100959 error = pm->poweroff(dev);
960 suspend_report_result(pm->poweroff, error);
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100961 if (error)
962 return error;
963 }
964
965 Fixup:
966 pci_fixup_device(pci_fixup_suspend, pci_dev);
967
Sebastian Ott699c1982013-08-20 16:41:02 +0200968 if (pcibios_pm_ops.poweroff)
969 return pcibios_pm_ops.poweroff(dev);
970
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100971 return 0;
972}
973
974static int pci_pm_poweroff_noirq(struct device *dev)
975{
976 struct pci_dev *pci_dev = to_pci_dev(dev);
977 struct device_driver *drv = dev->driver;
978
979 if (pci_has_legacy_pm_support(to_pci_dev(dev)))
980 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
981
982 if (!drv || !drv->pm)
983 return 0;
984
985 if (drv->pm->poweroff_noirq) {
986 int error;
987
988 error = drv->pm->poweroff_noirq(dev);
989 suspend_report_result(drv->pm->poweroff_noirq, error);
990 if (error)
991 return error;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200992 }
993
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100994 if (!pci_dev->state_saved && !pci_is_bridge(pci_dev))
995 pci_prepare_to_sleep(pci_dev);
996
Rafael J. Wysocki0b68c8e2012-08-12 23:26:07 +0200997 /*
998 * The reason for doing this here is the same as for the analogous code
999 * in pci_pm_suspend_noirq().
1000 */
1001 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
1002 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
1003
Sebastian Ott699c1982013-08-20 16:41:02 +02001004 if (pcibios_pm_ops.poweroff_noirq)
1005 return pcibios_pm_ops.poweroff_noirq(dev);
1006
Rafael J. Wysocki46939f82009-03-16 22:40:26 +01001007 return 0;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001008}
1009
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001010static int pci_pm_restore_noirq(struct device *dev)
1011{
1012 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001013 struct device_driver *drv = dev->driver;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001014 int error = 0;
1015
Sebastian Ott699c1982013-08-20 16:41:02 +02001016 if (pcibios_pm_ops.restore_noirq) {
1017 error = pcibios_pm_ops.restore_noirq(dev);
1018 if (error)
1019 return error;
1020 }
1021
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001022 pci_pm_default_resume_early(pci_dev);
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +01001023
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +01001024 if (pci_has_legacy_pm_support(pci_dev))
Rafael J. Wysockibb808942009-01-07 14:15:17 +01001025 return pci_legacy_resume_early(dev);
Rafael J. Wysockibb808942009-01-07 14:15:17 +01001026
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +01001027 if (drv && drv->pm && drv->pm->restore_noirq)
1028 error = drv->pm->restore_noirq(dev);
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001029
1030 return error;
1031}
1032
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +01001033static int pci_pm_restore(struct device *dev)
1034{
1035 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -07001036 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +01001037 int error = 0;
1038
Sebastian Ott699c1982013-08-20 16:41:02 +02001039 if (pcibios_pm_ops.restore) {
1040 error = pcibios_pm_ops.restore(dev);
1041 if (error)
1042 return error;
1043 }
1044
Rafael J. Wysocki418e4da2009-01-26 21:43:08 +01001045 /*
1046 * This is necessary for the hibernation error path in which restore is
1047 * called without restoring the standard config registers of the device.
1048 */
1049 if (pci_dev->state_saved)
1050 pci_restore_standard_config(pci_dev);
1051
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +01001052 if (pci_has_legacy_pm_support(pci_dev))
1053 return pci_legacy_resume(dev);
1054
Rafael J. Wysocki5294e252009-02-04 02:09:07 +01001055 pci_pm_default_resume(pci_dev);
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +01001056
Rafael J. Wysocki5294e252009-02-04 02:09:07 +01001057 if (pm) {
1058 if (pm->restore)
1059 error = pm->restore(dev);
1060 } else {
1061 pci_pm_reenable_device(pci_dev);
1062 }
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +01001063
1064 return error;
1065}
1066
Rafael J. Wysocki1f112ce2011-04-11 22:54:42 +02001067#else /* !CONFIG_HIBERNATE_CALLBACKS */
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001068
1069#define pci_pm_freeze NULL
1070#define pci_pm_freeze_noirq NULL
1071#define pci_pm_thaw NULL
1072#define pci_pm_thaw_noirq NULL
1073#define pci_pm_poweroff NULL
1074#define pci_pm_poweroff_noirq NULL
1075#define pci_pm_restore NULL
1076#define pci_pm_restore_noirq NULL
1077
Rafael J. Wysocki1f112ce2011-04-11 22:54:42 +02001078#endif /* !CONFIG_HIBERNATE_CALLBACKS */
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001079
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001080#ifdef CONFIG_PM_RUNTIME
1081
1082static int pci_pm_runtime_suspend(struct device *dev)
1083{
1084 struct pci_dev *pci_dev = to_pci_dev(dev);
1085 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1086 pci_power_t prev = pci_dev->current_state;
1087 int error;
1088
Huang Ying967577b2012-11-20 16:08:22 +08001089 /*
1090 * If pci_dev->driver is not set (unbound), the device should
1091 * always remain in D0 regardless of the runtime PM status
1092 */
1093 if (!pci_dev->driver)
1094 return 0;
1095
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001096 if (!pm || !pm->runtime_suspend)
1097 return -ENOSYS;
1098
Rafael J. Wysocki82fee4d2013-02-04 15:56:05 +04001099 pci_dev->state_saved = false;
Huang Ying448bd852012-06-23 10:23:51 +08001100 pci_dev->no_d3cold = false;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001101 error = pm->runtime_suspend(dev);
1102 suspend_report_result(pm->runtime_suspend, error);
1103 if (error)
1104 return error;
Huang Ying448bd852012-06-23 10:23:51 +08001105 if (!pci_dev->d3cold_allowed)
1106 pci_dev->no_d3cold = true;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001107
1108 pci_fixup_device(pci_fixup_suspend, pci_dev);
1109
1110 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
1111 && pci_dev->current_state != PCI_UNKNOWN) {
1112 WARN_ONCE(pci_dev->current_state != prev,
1113 "PCI PM: State of device not saved by %pF\n",
1114 pm->runtime_suspend);
1115 return 0;
1116 }
1117
Dave Airlie42eca232012-10-29 17:26:54 -06001118 if (!pci_dev->state_saved) {
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001119 pci_save_state(pci_dev);
Dave Airlie42eca232012-10-29 17:26:54 -06001120 pci_finish_runtime_suspend(pci_dev);
1121 }
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001122
1123 return 0;
1124}
1125
1126static int pci_pm_runtime_resume(struct device *dev)
1127{
Huang Ying448bd852012-06-23 10:23:51 +08001128 int rc;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001129 struct pci_dev *pci_dev = to_pci_dev(dev);
1130 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1131
Huang Ying967577b2012-11-20 16:08:22 +08001132 /*
1133 * If pci_dev->driver is not set (unbound), the device should
1134 * always remain in D0 regardless of the runtime PM status
1135 */
1136 if (!pci_dev->driver)
1137 return 0;
1138
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001139 if (!pm || !pm->runtime_resume)
1140 return -ENOSYS;
1141
Rafael J. Wysockidb288c92012-07-05 15:20:00 -06001142 pci_restore_standard_config(pci_dev);
1143 pci_fixup_device(pci_fixup_resume_early, pci_dev);
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001144 __pci_enable_wake(pci_dev, PCI_D0, true, false);
1145 pci_fixup_device(pci_fixup_resume, pci_dev);
1146
Huang Ying448bd852012-06-23 10:23:51 +08001147 rc = pm->runtime_resume(dev);
1148
1149 pci_dev->runtime_d3cold = false;
1150
1151 return rc;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001152}
1153
1154static int pci_pm_runtime_idle(struct device *dev)
1155{
Huang Ying967577b2012-11-20 16:08:22 +08001156 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001157 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysocki45f0a852013-06-03 21:49:52 +02001158 int ret = 0;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001159
Huang Ying967577b2012-11-20 16:08:22 +08001160 /*
1161 * If pci_dev->driver is not set (unbound), the device should
1162 * always remain in D0 regardless of the runtime PM status
1163 */
1164 if (!pci_dev->driver)
Rafael J. Wysocki45f0a852013-06-03 21:49:52 +02001165 return 0;
Huang Ying967577b2012-11-20 16:08:22 +08001166
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001167 if (!pm)
1168 return -ENOSYS;
1169
Rafael J. Wysocki45f0a852013-06-03 21:49:52 +02001170 if (pm->runtime_idle)
1171 ret = pm->runtime_idle(dev);
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001172
Rafael J. Wysocki45f0a852013-06-03 21:49:52 +02001173 return ret;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001174}
1175
1176#else /* !CONFIG_PM_RUNTIME */
1177
1178#define pci_pm_runtime_suspend NULL
1179#define pci_pm_runtime_resume NULL
1180#define pci_pm_runtime_idle NULL
1181
1182#endif /* !CONFIG_PM_RUNTIME */
1183
Rafael J. Wysockiaa338602011-02-11 00:06:54 +01001184#ifdef CONFIG_PM
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001185
Sachin Kamatf91da042013-10-04 12:04:44 -06001186static const struct dev_pm_ops pci_dev_pm_ops = {
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001187 .prepare = pci_pm_prepare,
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001188 .suspend = pci_pm_suspend,
1189 .resume = pci_pm_resume,
1190 .freeze = pci_pm_freeze,
1191 .thaw = pci_pm_thaw,
1192 .poweroff = pci_pm_poweroff,
1193 .restore = pci_pm_restore,
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001194 .suspend_noirq = pci_pm_suspend_noirq,
1195 .resume_noirq = pci_pm_resume_noirq,
1196 .freeze_noirq = pci_pm_freeze_noirq,
1197 .thaw_noirq = pci_pm_thaw_noirq,
1198 .poweroff_noirq = pci_pm_poweroff_noirq,
1199 .restore_noirq = pci_pm_restore_noirq,
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001200 .runtime_suspend = pci_pm_runtime_suspend,
1201 .runtime_resume = pci_pm_runtime_resume,
1202 .runtime_idle = pci_pm_runtime_idle,
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001203};
1204
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001205#define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001206
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001207#else /* !COMFIG_PM_OPS */
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001208
1209#define PCI_PM_OPS_PTR NULL
1210
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001211#endif /* !COMFIG_PM_OPS */
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001212
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213/**
Laurent riffard863b18f2005-10-27 23:12:54 +02001214 * __pci_register_driver - register a new pci driver
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215 * @drv: the driver structure to register
Laurent riffard863b18f2005-10-27 23:12:54 +02001216 * @owner: owner module of drv
Randy Dunlapf95d8822007-02-10 14:41:56 -08001217 * @mod_name: module name string
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001218 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219 * Adds the driver structure to the list of registered drivers.
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001220 * Returns a negative value on error, otherwise 0.
1221 * If no error occurred, the driver remains registered even if
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 * no device was claimed during registration.
1223 */
Greg Kroah-Hartman725522b2007-01-15 11:50:02 -08001224int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1225 const char *mod_name)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227 /* initialize common driver fields */
1228 drv->driver.name = drv->name;
1229 drv->driver.bus = &pci_bus_type;
Laurent riffard863b18f2005-10-27 23:12:54 +02001230 drv->driver.owner = owner;
Greg Kroah-Hartman725522b2007-01-15 11:50:02 -08001231 drv->driver.mod_name = mod_name;
Alan Cox50b00752006-08-16 17:42:18 +01001232
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001233 spin_lock_init(&drv->dynids.lock);
1234 INIT_LIST_HEAD(&drv->dynids.list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235
1236 /* register with core */
Konstantin Khlebnikovbfb09a82012-08-08 14:47:51 +04001237 return driver_register(&drv->driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238}
1239
1240/**
1241 * pci_unregister_driver - unregister a pci driver
1242 * @drv: the driver structure to unregister
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001243 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 * Deletes the driver structure from the list of registered PCI drivers,
1245 * gives it a chance to clean up by calling its remove() function for
1246 * each device it was responsible for, and marks those devices as
1247 * driverless.
1248 */
1249
1250void
1251pci_unregister_driver(struct pci_driver *drv)
1252{
1253 driver_unregister(&drv->driver);
1254 pci_free_dynids(drv);
1255}
1256
1257static struct pci_driver pci_compat_driver = {
1258 .name = "compat"
1259};
1260
1261/**
1262 * pci_dev_driver - get the pci_driver of a device
1263 * @dev: the device to query
1264 *
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001265 * Returns the appropriate pci_driver structure or %NULL if there is no
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266 * registered driver for the device.
1267 */
1268struct pci_driver *
1269pci_dev_driver(const struct pci_dev *dev)
1270{
1271 if (dev->driver)
1272 return dev->driver;
1273 else {
1274 int i;
1275 for(i=0; i<=PCI_ROM_RESOURCE; i++)
1276 if (dev->resource[i].flags & IORESOURCE_BUSY)
1277 return &pci_compat_driver;
1278 }
1279 return NULL;
1280}
1281
1282/**
1283 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284 * @dev: the PCI device structure to match against
Randy Dunlap8f7020d2005-10-23 11:57:38 -07001285 * @drv: the device driver to search for matching PCI device id structures
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001286 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287 * Used by a driver to check whether a PCI device present in the
Randy Dunlap8f7020d2005-10-23 11:57:38 -07001288 * system is in its list of supported devices. Returns the matching
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289 * pci_device_id structure or %NULL if there is no match.
1290 */
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001291static int pci_bus_match(struct device *dev, struct device_driver *drv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292{
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001293 struct pci_dev *pci_dev = to_pci_dev(dev);
Yinghai Lu58d9a382013-01-21 13:20:51 -08001294 struct pci_driver *pci_drv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 const struct pci_device_id *found_id;
1296
Yinghai Lu58d9a382013-01-21 13:20:51 -08001297 if (!pci_dev->match_driver)
1298 return 0;
1299
1300 pci_drv = to_pci_driver(drv);
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001301 found_id = pci_match_device(pci_drv, pci_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302 if (found_id)
1303 return 1;
1304
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001305 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306}
1307
1308/**
1309 * pci_dev_get - increments the reference count of the pci device structure
1310 * @dev: the device being referenced
1311 *
1312 * Each live reference to a device should be refcounted.
1313 *
1314 * Drivers for PCI devices should normally record such references in
1315 * their probe() methods, when they bind to a device, and release
1316 * them by calling pci_dev_put(), in their disconnect() methods.
1317 *
1318 * A pointer to the device with the incremented reference counter is returned.
1319 */
1320struct pci_dev *pci_dev_get(struct pci_dev *dev)
1321{
1322 if (dev)
1323 get_device(&dev->dev);
1324 return dev;
1325}
1326
1327/**
1328 * pci_dev_put - release a use of the pci device structure
1329 * @dev: device that's been disconnected
1330 *
1331 * Must be called when a user of a device is finished with it. When the last
1332 * user of the device calls this function, the memory of the device is freed.
1333 */
1334void pci_dev_put(struct pci_dev *dev)
1335{
1336 if (dev)
1337 put_device(&dev->dev);
1338}
1339
Bill Pemberton8ccc9aa2012-11-21 15:34:58 -05001340static int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1341{
1342 struct pci_dev *pdev;
1343
1344 if (!dev)
1345 return -ENODEV;
1346
1347 pdev = to_pci_dev(dev);
1348 if (!pdev)
1349 return -ENODEV;
1350
1351 if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
1352 return -ENOMEM;
1353
1354 if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
1355 return -ENOMEM;
1356
1357 if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
1358 pdev->subsystem_device))
1359 return -ENOMEM;
1360
1361 if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
1362 return -ENOMEM;
1363
1364 if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x",
1365 pdev->vendor, pdev->device,
1366 pdev->subsystem_vendor, pdev->subsystem_device,
1367 (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
1368 (u8)(pdev->class)))
1369 return -ENOMEM;
1370 return 0;
1371}
1372
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373struct bus_type pci_bus_type = {
1374 .name = "pci",
1375 .match = pci_bus_match,
Kay Sievers312c0042005-11-16 09:00:00 +01001376 .uevent = pci_uevent,
Russell Kingb15d6862006-01-05 14:30:22 +00001377 .probe = pci_device_probe,
1378 .remove = pci_device_remove,
Linus Torvaldscbd69db2006-06-24 14:50:29 -07001379 .shutdown = pci_device_shutdown,
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -07001380 .dev_groups = pci_dev_groups,
Greg Kroah-Hartman0f49ba52013-10-07 14:51:02 -06001381 .bus_groups = pci_bus_groups,
Greg Kroah-Hartman2229c1f2013-10-07 14:51:20 -06001382 .drv_groups = pci_drv_groups,
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001383 .pm = PCI_PM_OPS_PTR,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384};
1385
1386static int __init pci_driver_init(void)
1387{
1388 return bus_register(&pci_bus_type);
1389}
1390
1391postcore_initcall(pci_driver_init);
1392
Tejun Heo9dba9102009-09-03 15:26:36 +09001393EXPORT_SYMBOL_GPL(pci_add_dynid);
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001394EXPORT_SYMBOL(pci_match_id);
Laurent riffard863b18f2005-10-27 23:12:54 +02001395EXPORT_SYMBOL(__pci_register_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396EXPORT_SYMBOL(pci_unregister_driver);
1397EXPORT_SYMBOL(pci_dev_driver);
1398EXPORT_SYMBOL(pci_bus_type);
1399EXPORT_SYMBOL(pci_dev_get);
1400EXPORT_SYMBOL(pci_dev_put);