blob: 4393c12e9135b0ed3591bad1cc65008dbc47b8aa [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;
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;
Tejun Heo9dba9102009-09-03 15:26:36 +0900110 int retval;
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
Jean Delvareb41d6cf2008-08-17 21:06:59 +0200118 /* Only accept driver_data values that match an existing id_table
119 entry */
Chris Wright2debb4d2008-11-25 19:36:10 -0800120 if (ids) {
121 retval = -EINVAL;
122 while (ids->vendor || ids->subvendor || ids->class_mask) {
123 if (driver_data == ids->driver_data) {
124 retval = 0;
125 break;
126 }
127 ids++;
Jean Delvareb41d6cf2008-08-17 21:06:59 +0200128 }
Chris Wright2debb4d2008-11-25 19:36:10 -0800129 if (retval) /* No match */
130 return retval;
Jean Delvareb41d6cf2008-08-17 21:06:59 +0200131 }
Jean Delvareb41d6cf2008-08-17 21:06:59 +0200132
Tejun Heo9dba9102009-09-03 15:26:36 +0900133 retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice,
134 class, class_mask, driver_data);
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700135 if (retval)
136 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 return count;
138}
Greg Kroah-Hartman2229c1f2013-10-07 14:51:20 -0600139static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
Chris Wright09943752009-02-23 21:52:23 -0800141/**
142 * store_remove_id - remove a PCI device ID from this driver
143 * @driver: target device driver
144 * @buf: buffer for scanning device ID data
145 * @count: input size
146 *
147 * Removes a dynamic pci device ID to this driver.
148 */
149static ssize_t
150store_remove_id(struct device_driver *driver, const char *buf, size_t count)
151{
152 struct pci_dynid *dynid, *n;
153 struct pci_driver *pdrv = to_pci_driver(driver);
154 __u32 vendor, device, subvendor = PCI_ANY_ID,
155 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
156 int fields = 0;
157 int retval = -ENODEV;
158
159 fields = sscanf(buf, "%x %x %x %x %x %x",
160 &vendor, &device, &subvendor, &subdevice,
161 &class, &class_mask);
162 if (fields < 2)
163 return -EINVAL;
164
165 spin_lock(&pdrv->dynids.lock);
166 list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) {
167 struct pci_device_id *id = &dynid->id;
168 if ((id->vendor == vendor) &&
169 (id->device == device) &&
170 (subvendor == PCI_ANY_ID || id->subvendor == subvendor) &&
171 (subdevice == PCI_ANY_ID || id->subdevice == subdevice) &&
172 !((id->class ^ class) & class_mask)) {
173 list_del(&dynid->node);
174 kfree(dynid);
175 retval = 0;
176 break;
177 }
178 }
179 spin_unlock(&pdrv->dynids.lock);
180
181 if (retval)
182 return retval;
183 return count;
184}
Greg Kroah-Hartman2229c1f2013-10-07 14:51:20 -0600185static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id);
Chris Wright09943752009-02-23 21:52:23 -0800186
Greg Kroah-Hartman2229c1f2013-10-07 14:51:20 -0600187static struct attribute *pci_drv_attrs[] = {
188 &driver_attr_new_id.attr,
189 &driver_attr_remove_id.attr,
190 NULL,
Konstantin Khlebnikovbfb09a82012-08-08 14:47:51 +0400191};
Greg Kroah-Hartman2229c1f2013-10-07 14:51:20 -0600192ATTRIBUTE_GROUPS(pci_drv);
Alan Sterned283e92012-01-24 14:35:13 -0500193
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194/**
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700195 * pci_match_id - See if a pci device matches a given pci_id table
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 * @ids: array of PCI device id structures to search in
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700197 * @dev: the PCI device structure to match against.
198 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 * Used by a driver to check whether a PCI device present in the
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700200 * system is in its list of supported devices. Returns the matching
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 * pci_device_id structure or %NULL if there is no match.
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700202 *
Randy Dunlap8b607562007-05-09 07:19:14 +0200203 * Deprecated, don't use this as it will not catch any dynamic ids
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700204 * that a driver might want to check for.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 */
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700206const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
207 struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208{
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700209 if (ids) {
210 while (ids->vendor || ids->subvendor || ids->class_mask) {
211 if (pci_match_one_device(ids, dev))
212 return ids;
213 ids++;
214 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 }
216 return NULL;
217}
218
Alex Williamson782a9852014-05-20 08:53:21 -0600219static const struct pci_device_id pci_device_id_any = {
220 .vendor = PCI_ANY_ID,
221 .device = PCI_ANY_ID,
222 .subvendor = PCI_ANY_ID,
223 .subdevice = PCI_ANY_ID,
224};
225
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226/**
Randy Dunlapae9608a2007-01-09 21:41:01 -0800227 * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700228 * @drv: the PCI driver to match against
Henrik Kretzschmar39ba4872006-08-15 10:57:16 +0200229 * @dev: the PCI device structure to match against
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700230 *
231 * Used by a driver to check whether a PCI device present in the
232 * system is in its list of supported devices. Returns the matching
233 * pci_device_id structure or %NULL if there is no match.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 */
Adrian Bunkd73460d2007-10-24 18:27:18 +0200235static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
236 struct pci_dev *dev)
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700237{
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700238 struct pci_dynid *dynid;
Alex Williamson782a9852014-05-20 08:53:21 -0600239 const struct pci_device_id *found_id = NULL;
240
241 /* When driver_override is set, only bind to the matching driver */
242 if (dev->driver_override && strcmp(dev->driver_override, drv->name))
243 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
Russell King7461b602006-11-29 21:18:04 +0000245 /* Look at the dynamic ids first, before the static ones */
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700246 spin_lock(&drv->dynids.lock);
247 list_for_each_entry(dynid, &drv->dynids.list, node) {
248 if (pci_match_one_device(&dynid->id, dev)) {
Alex Williamson782a9852014-05-20 08:53:21 -0600249 found_id = &dynid->id;
250 break;
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700251 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 }
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700253 spin_unlock(&drv->dynids.lock);
Russell King7461b602006-11-29 21:18:04 +0000254
Alex Williamson782a9852014-05-20 08:53:21 -0600255 if (!found_id)
256 found_id = pci_match_id(drv->id_table, dev);
257
258 /* driver_override will always match, send a dummy id */
259 if (!found_id && dev->driver_override)
260 found_id = &pci_device_id_any;
261
262 return found_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263}
264
Rusty Russell873392c2008-12-31 23:54:56 +1030265struct drv_dev_and_id {
266 struct pci_driver *drv;
267 struct pci_dev *dev;
268 const struct pci_device_id *id;
269};
270
271static long local_pci_probe(void *_ddi)
272{
273 struct drv_dev_and_id *ddi = _ddi;
Huang Ying967577b2012-11-20 16:08:22 +0800274 struct pci_dev *pci_dev = ddi->dev;
275 struct pci_driver *pci_drv = ddi->drv;
276 struct device *dev = &pci_dev->dev;
Alan Sternf3ec4f82010-06-08 15:23:51 -0400277 int rc;
Rusty Russell873392c2008-12-31 23:54:56 +1030278
Huang Ying967577b2012-11-20 16:08:22 +0800279 /*
280 * Unbound PCI devices are always put in D0, regardless of
281 * runtime PM status. During probe, the device is set to
282 * active and the usage count is incremented. If the driver
283 * supports runtime PM, it should call pm_runtime_put_noidle()
284 * in its probe routine and pm_runtime_get_noresume() in its
285 * remove routine.
Alan Sternf3ec4f82010-06-08 15:23:51 -0400286 */
Huang Ying967577b2012-11-20 16:08:22 +0800287 pm_runtime_get_sync(dev);
288 pci_dev->driver = pci_drv;
289 rc = pci_drv->probe(pci_dev, ddi->id);
Stephen M. Cameronf92d74c2013-11-01 14:34:55 -0500290 if (!rc)
291 return rc;
292 if (rc < 0) {
Huang Ying967577b2012-11-20 16:08:22 +0800293 pci_dev->driver = NULL;
294 pm_runtime_put_sync(dev);
Stephen M. Cameronf92d74c2013-11-01 14:34:55 -0500295 return rc;
Alan Sternf3ec4f82010-06-08 15:23:51 -0400296 }
Stephen M. Cameronf92d74c2013-11-01 14:34:55 -0500297 /*
298 * Probe function should return < 0 for failure, 0 for success
299 * Treat values > 0 as success, but warn.
300 */
301 dev_warn(dev, "Driver probe function unexpectedly returned %d\n", rc);
302 return 0;
Rusty Russell873392c2008-12-31 23:54:56 +1030303}
304
Andi Kleend42c6992005-07-06 19:56:03 +0200305static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
306 const struct pci_device_id *id)
307{
Rusty Russell873392c2008-12-31 23:54:56 +1030308 int error, node;
309 struct drv_dev_and_id ddi = { drv, dev, id };
Mike Travisf70316d2008-04-04 18:11:06 -0700310
Alexander Duyck12c31562013-11-18 10:59:59 -0700311 /*
312 * Execute driver initialization on node where the device is
313 * attached. This way the driver likely allocates its local memory
314 * on the right node.
315 */
Rusty Russell873392c2008-12-31 23:54:56 +1030316 node = dev_to_node(&dev->dev);
Alexander Duyck12c31562013-11-18 10:59:59 -0700317
318 /*
319 * On NUMA systems, we are likely to call a PF probe function using
320 * work_on_cpu(). If that probe calls pci_enable_sriov() (which
321 * adds the VF devices via pci_bus_add_device()), we may re-enter
322 * this function to call the VF probe function. Calling
323 * work_on_cpu() again will cause a lockdep warning. Since VFs are
324 * always on the same node as the PF, we can work around this by
325 * avoiding work_on_cpu() when we're already on the correct node.
326 *
327 * Preemption is enabled, so it's theoretically unsafe to use
328 * numa_node_id(), but even if we run the probe function on the
329 * wrong node, it should be functionally correct.
330 */
331 if (node >= 0 && node != numa_node_id()) {
Rusty Russell873392c2008-12-31 23:54:56 +1030332 int cpu;
Rusty Russell873392c2008-12-31 23:54:56 +1030333
334 get_online_cpus();
Rusty Russella70f7302009-03-13 14:49:46 +1030335 cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask);
Rusty Russell873392c2008-12-31 23:54:56 +1030336 if (cpu < nr_cpu_ids)
337 error = work_on_cpu(cpu, local_pci_probe, &ddi);
338 else
339 error = local_pci_probe(&ddi);
340 put_online_cpus();
341 } else
342 error = local_pci_probe(&ddi);
Alexander Duyck12c31562013-11-18 10:59:59 -0700343
Andi Kleend42c6992005-07-06 19:56:03 +0200344 return error;
345}
346
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347/**
Randy Dunlap23ea3792010-11-18 15:02:31 -0800348 * __pci_device_probe - check if a driver wants to claim a specific PCI device
Randy Dunlap8f7020d2005-10-23 11:57:38 -0700349 * @drv: driver to call to check if it wants the PCI device
350 * @pci_dev: PCI device being probed
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700351 *
Randy Dunlap8f7020d2005-10-23 11:57:38 -0700352 * returns 0 on success, else error.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
354 */
355static int
356__pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700357{
358 const struct pci_device_id *id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 int error = 0;
360
361 if (!pci_dev->driver && drv->probe) {
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700362 error = -ENODEV;
363
364 id = pci_match_device(drv, pci_dev);
365 if (id)
Andi Kleend42c6992005-07-06 19:56:03 +0200366 error = pci_call_probe(drv, pci_dev, id);
Huang Ying967577b2012-11-20 16:08:22 +0800367 if (error >= 0)
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700368 error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 }
370 return error;
371}
372
373static int pci_device_probe(struct device * dev)
374{
375 int error = 0;
376 struct pci_driver *drv;
377 struct pci_dev *pci_dev;
378
379 drv = to_pci_driver(dev->driver);
380 pci_dev = to_pci_dev(dev);
381 pci_dev_get(pci_dev);
382 error = __pci_device_probe(drv, pci_dev);
383 if (error)
384 pci_dev_put(pci_dev);
385
386 return error;
387}
388
389static int pci_device_remove(struct device * dev)
390{
391 struct pci_dev * pci_dev = to_pci_dev(dev);
392 struct pci_driver * drv = pci_dev->driver;
393
394 if (drv) {
Alan Sternf3ec4f82010-06-08 15:23:51 -0400395 if (drv->remove) {
396 pm_runtime_get_sync(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 drv->remove(pci_dev);
Alan Sternf3ec4f82010-06-08 15:23:51 -0400398 pm_runtime_put_noidle(dev);
399 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 pci_dev->driver = NULL;
401 }
402
Alan Sternf3ec4f82010-06-08 15:23:51 -0400403 /* Undo the runtime PM settings in local_pci_probe() */
Huang Ying967577b2012-11-20 16:08:22 +0800404 pm_runtime_put_sync(dev);
Alan Sternf3ec4f82010-06-08 15:23:51 -0400405
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 /*
Shaohua Li2449e062006-10-20 14:45:32 -0700407 * If the device is still on, set the power state as "unknown",
408 * since it might change by the next time we load the driver.
409 */
410 if (pci_dev->current_state == PCI_D0)
411 pci_dev->current_state = PCI_UNKNOWN;
412
413 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 * We would love to complain here if pci_dev->is_enabled is set, that
415 * the driver should have called pci_disable_device(), but the
416 * unfortunate fact is there are too many odd BIOS and bridge setups
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700417 * that don't like drivers doing that all of the time.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 * Oh well, we can dream of sane hardware when we sleep, no matter how
419 * horrible the crap we have to deal with is when we are awake...
420 */
421
422 pci_dev_put(pci_dev);
423 return 0;
424}
425
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200426static void pci_device_shutdown(struct device *dev)
427{
428 struct pci_dev *pci_dev = to_pci_dev(dev);
429 struct pci_driver *drv = pci_dev->driver;
430
Huang Ying3ff2de92012-10-24 14:54:14 +0800431 pm_runtime_resume(dev);
432
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200433 if (drv && drv->shutdown)
434 drv->shutdown(pci_dev);
435 pci_msi_shutdown(pci_dev);
436 pci_msix_shutdown(pci_dev);
Rafael J. Wysocki5b415f12012-02-07 00:50:35 +0100437
Khalid Aziz4fc9bbf2013-11-27 15:19:25 -0700438#ifdef CONFIG_KEXEC
Rafael J. Wysocki5b415f12012-02-07 00:50:35 +0100439 /*
Khalid Aziz4fc9bbf2013-11-27 15:19:25 -0700440 * If this is a kexec reboot, turn off Bus Master bit on the
441 * device to tell it to not continue to do DMA. Don't touch
442 * devices in D3cold or unknown states.
443 * If it is not a kexec reboot, firmware will hit the PCI
444 * devices with big hammer and stop their DMA any way.
Khalid Azizb566a222012-04-27 13:00:33 -0600445 */
Khalid Aziz4fc9bbf2013-11-27 15:19:25 -0700446 if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
Konstantin Khlebnikov6e0eda32013-03-14 18:49:37 +0400447 pci_clear_master(pci_dev);
Khalid Aziz4fc9bbf2013-11-27 15:19:25 -0700448#endif
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200449}
450
Rafael J. Wysockiaa338602011-02-11 00:06:54 +0100451#ifdef CONFIG_PM
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100452
453/* Auxiliary functions used for system resume and run-time resume. */
454
455/**
456 * pci_restore_standard_config - restore standard config registers of PCI device
457 * @pci_dev: PCI device to handle
458 */
459static int pci_restore_standard_config(struct pci_dev *pci_dev)
460{
461 pci_update_current_state(pci_dev, PCI_UNKNOWN);
462
463 if (pci_dev->current_state != PCI_D0) {
464 int error = pci_set_power_state(pci_dev, PCI_D0);
465 if (error)
466 return error;
467 }
468
Jon Mason1d3c16a2010-11-30 17:43:26 -0600469 pci_restore_state(pci_dev);
470 return 0;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100471}
472
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100473#endif
474
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200475#ifdef CONFIG_PM_SLEEP
476
Rafael J. Wysockidb288c92012-07-05 15:20:00 -0600477static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
478{
479 pci_power_up(pci_dev);
480 pci_restore_state(pci_dev);
481 pci_fixup_device(pci_fixup_resume_early, pci_dev);
482}
483
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200484/*
485 * Default "suspend" method for devices that have no driver provided suspend,
Rafael J. Wysockifa58d302009-01-07 13:03:42 +0100486 * or not even a driver at all (second part).
487 */
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100488static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200489{
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200490 /*
491 * mark its power state as "unknown", since we don't know if
492 * e.g. the BIOS will change its device state when we suspend.
493 */
494 if (pci_dev->current_state == PCI_D0)
495 pci_dev->current_state = PCI_UNKNOWN;
496}
497
498/*
499 * Default "resume" method for devices that have no driver provided resume,
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100500 * or not even a driver at all (second part).
501 */
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100502static int pci_pm_reenable_device(struct pci_dev *pci_dev)
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100503{
504 int retval;
505
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200506 /* if the device was enabled before suspend, reenable */
507 retval = pci_reenable_device(pci_dev);
508 /*
509 * if the device was busmaster before the suspend, make it busmaster
510 * again
511 */
512 if (pci_dev->is_busmaster)
513 pci_set_master(pci_dev);
514
515 return retval;
516}
517
518static int pci_legacy_suspend(struct device *dev, pm_message_t state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519{
520 struct pci_dev * pci_dev = to_pci_dev(dev);
521 struct pci_driver * drv = pci_dev->driver;
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100522
Andrew Morton02669492006-03-23 01:38:34 -0800523 if (drv && drv->suspend) {
Rafael J. Wysocki99dadce2009-02-04 01:59:09 +0100524 pci_power_t prev = pci_dev->current_state;
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100525 int error;
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +0100526
Frans Pop57ef8022009-03-16 22:39:56 +0100527 error = drv->suspend(pci_dev, state);
528 suspend_report_result(drv->suspend, error);
529 if (error)
530 return error;
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +0100531
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100532 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
Rafael J. Wysocki99dadce2009-02-04 01:59:09 +0100533 && pci_dev->current_state != PCI_UNKNOWN) {
534 WARN_ONCE(pci_dev->current_state != prev,
535 "PCI PM: Device state not saved by %pF\n",
536 drv->suspend);
Rafael J. Wysocki99dadce2009-02-04 01:59:09 +0100537 }
Andrew Morton02669492006-03-23 01:38:34 -0800538 }
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100539
540 pci_fixup_device(pci_fixup_suspend, pci_dev);
541
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100542 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543}
544
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200545static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
Linus Torvaldscbd69db2006-06-24 14:50:29 -0700546{
547 struct pci_dev * pci_dev = to_pci_dev(dev);
548 struct pci_driver * drv = pci_dev->driver;
Linus Torvaldscbd69db2006-06-24 14:50:29 -0700549
550 if (drv && drv->suspend_late) {
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100551 pci_power_t prev = pci_dev->current_state;
552 int error;
553
Frans Pop57ef8022009-03-16 22:39:56 +0100554 error = drv->suspend_late(pci_dev, state);
555 suspend_report_result(drv->suspend_late, error);
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100556 if (error)
557 return error;
558
559 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
560 && pci_dev->current_state != PCI_UNKNOWN) {
561 WARN_ONCE(pci_dev->current_state != prev,
562 "PCI PM: Device state not saved by %pF\n",
563 drv->suspend_late);
564 return 0;
565 }
Linus Torvaldscbd69db2006-06-24 14:50:29 -0700566 }
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100567
568 if (!pci_dev->state_saved)
569 pci_save_state(pci_dev);
570
571 pci_pm_set_unknown_state(pci_dev);
572
573 return 0;
Linus Torvaldscbd69db2006-06-24 14:50:29 -0700574}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100576static int pci_legacy_resume_early(struct device *dev)
577{
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100578 struct pci_dev * pci_dev = to_pci_dev(dev);
579 struct pci_driver * drv = pci_dev->driver;
580
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +0100581 return drv && drv->resume_early ?
582 drv->resume_early(pci_dev) : 0;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100583}
584
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200585static int pci_legacy_resume(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586{
587 struct pci_dev * pci_dev = to_pci_dev(dev);
588 struct pci_driver * drv = pci_dev->driver;
589
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100590 pci_fixup_device(pci_fixup_resume, pci_dev);
591
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +0100592 return drv && drv->resume ?
593 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594}
595
Rafael J. Wysocki571ff752009-01-07 13:05:05 +0100596/* Auxiliary functions used by the new power management framework */
597
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100598static void pci_pm_default_resume(struct pci_dev *pci_dev)
Rafael J. Wysocki571ff752009-01-07 13:05:05 +0100599{
Rafael J. Wysocki734104292009-01-07 13:07:15 +0100600 pci_fixup_device(pci_fixup_resume, pci_dev);
601
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100602 if (!pci_is_bridge(pci_dev))
603 pci_enable_wake(pci_dev, PCI_D0, false);
Rafael J. Wysocki571ff752009-01-07 13:05:05 +0100604}
605
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100606static void pci_pm_default_suspend(struct pci_dev *pci_dev)
Rafael J. Wysocki734104292009-01-07 13:07:15 +0100607{
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100608 /* Disable non-bridge devices without PM support */
Rafael J. Wysockicbbc2f62009-02-04 02:01:15 +0100609 if (!pci_is_bridge(pci_dev))
610 pci_disable_enabled_device(pci_dev);
Rafael J. Wysocki734104292009-01-07 13:07:15 +0100611}
612
Rafael J. Wysocki07e836e2009-01-07 13:06:10 +0100613static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
614{
615 struct pci_driver *drv = pci_dev->driver;
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100616 bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume
Rafael J. Wysocki07e836e2009-01-07 13:06:10 +0100617 || drv->resume_early);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100618
619 /*
620 * Legacy PM support is used by default, so warn if the new framework is
621 * supported as well. Drivers are supposed to support either the
622 * former, or the latter, but not both at the same time.
623 */
David Fries82440a82011-11-20 15:29:46 -0600624 WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n",
625 drv->name, pci_dev->vendor, pci_dev->device);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100626
627 return ret;
Rafael J. Wysocki07e836e2009-01-07 13:06:10 +0100628}
629
Rafael J. Wysocki571ff752009-01-07 13:05:05 +0100630/* New power management framework */
631
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200632static int pci_pm_prepare(struct device *dev)
633{
634 struct device_driver *drv = dev->driver;
635 int error = 0;
636
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100637 /*
Rafael J. Wysocki7cd06022014-02-26 01:00:30 +0100638 * Devices having power.ignore_children set may still be necessary for
639 * suspending their children in the next phase of device suspend.
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100640 */
Rafael J. Wysocki7cd06022014-02-26 01:00:30 +0100641 if (dev->power.ignore_children)
642 pm_runtime_resume(dev);
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100643
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200644 if (drv && drv->pm && drv->pm->prepare)
645 error = drv->pm->prepare(dev);
646
647 return error;
648}
649
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200650
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100651#else /* !CONFIG_PM_SLEEP */
652
653#define pci_pm_prepare NULL
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100654
655#endif /* !CONFIG_PM_SLEEP */
656
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200657#ifdef CONFIG_SUSPEND
658
659static int pci_pm_suspend(struct device *dev)
660{
661 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700662 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200663
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100664 if (pci_has_legacy_pm_support(pci_dev))
665 return pci_legacy_suspend(dev, PMSG_SUSPEND);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100666
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100667 if (!pm) {
668 pci_pm_default_suspend(pci_dev);
669 goto Fixup;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200670 }
Rafael J. Wysockifa58d302009-01-07 13:03:42 +0100671
Rafael J. Wysocki7cd06022014-02-26 01:00:30 +0100672 /*
673 * PCI devices suspended at run time need to be resumed at this point,
674 * because in general it is necessary to reconfigure them for system
675 * suspend. Namely, if the device is supposed to wake up the system
676 * from the sleep state, we may need to reconfigure it for this purpose.
677 * In turn, if the device is not supposed to wake up the system from the
678 * sleep state, we'll have to prevent it from signaling wake-up.
679 */
680 pm_runtime_resume(dev);
681
Rafael J. Wysocki82fee4d2013-02-04 15:56:05 +0400682 pci_dev->state_saved = false;
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100683 if (pm->suspend) {
684 pci_power_t prev = pci_dev->current_state;
685 int error;
686
687 error = pm->suspend(dev);
688 suspend_report_result(pm->suspend, error);
689 if (error)
690 return error;
691
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100692 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100693 && pci_dev->current_state != PCI_UNKNOWN) {
694 WARN_ONCE(pci_dev->current_state != prev,
695 "PCI PM: State of device not saved by %pF\n",
696 pm->suspend);
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100697 }
698 }
699
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100700 Fixup:
701 pci_fixup_device(pci_fixup_suspend, pci_dev);
702
703 return 0;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200704}
705
706static int pci_pm_suspend_noirq(struct device *dev)
Greg KHc8958172005-04-08 14:53:31 +0900707{
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100708 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700709 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Greg KHc8958172005-04-08 14:53:31 +0900710
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100711 if (pci_has_legacy_pm_support(pci_dev))
712 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
713
Rafael J. Wysocki931ff682009-03-16 22:40:50 +0100714 if (!pm) {
715 pci_save_state(pci_dev);
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100716 return 0;
Rafael J. Wysocki931ff682009-03-16 22:40:50 +0100717 }
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100718
719 if (pm->suspend_noirq) {
720 pci_power_t prev = pci_dev->current_state;
721 int error;
722
723 error = pm->suspend_noirq(dev);
724 suspend_report_result(pm->suspend_noirq, error);
725 if (error)
726 return error;
727
728 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
729 && pci_dev->current_state != PCI_UNKNOWN) {
730 WARN_ONCE(pci_dev->current_state != prev,
731 "PCI PM: State of device not saved by %pF\n",
732 pm->suspend_noirq);
733 return 0;
734 }
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200735 }
736
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100737 if (!pci_dev->state_saved) {
738 pci_save_state(pci_dev);
739 if (!pci_is_bridge(pci_dev))
740 pci_prepare_to_sleep(pci_dev);
741 }
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100742
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100743 pci_pm_set_unknown_state(pci_dev);
744
Alan Sterndbf0e4c2012-07-09 11:09:21 -0400745 /*
746 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
747 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
748 * hasn't been quiesced and tries to turn it off. If the controller
749 * is already in D3, this can hang or cause memory corruption.
750 *
751 * Since the value of the COMMAND register doesn't matter once the
752 * device has been suspended, we can safely set it to 0 here.
753 */
754 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
755 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
756
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100757 return 0;
Greg KHc8958172005-04-08 14:53:31 +0900758}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200760static int pci_pm_resume_noirq(struct device *dev)
761{
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100762 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200763 struct device_driver *drv = dev->driver;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200764 int error = 0;
765
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100766 pci_pm_default_resume_early(pci_dev);
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +0100767
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100768 if (pci_has_legacy_pm_support(pci_dev))
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100769 return pci_legacy_resume_early(dev);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100770
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100771 if (drv && drv->pm && drv->pm->resume_noirq)
772 error = drv->pm->resume_noirq(dev);
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200773
774 return error;
775}
776
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100777static int pci_pm_resume(struct device *dev)
778{
779 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700780 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100781 int error = 0;
782
Rafael J. Wysocki418e4da2009-01-26 21:43:08 +0100783 /*
784 * This is necessary for the suspend error path in which resume is
785 * called without restoring the standard config registers of the device.
786 */
787 if (pci_dev->state_saved)
788 pci_restore_standard_config(pci_dev);
789
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100790 if (pci_has_legacy_pm_support(pci_dev))
791 return pci_legacy_resume(dev);
792
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100793 pci_pm_default_resume(pci_dev);
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100794
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100795 if (pm) {
796 if (pm->resume)
797 error = pm->resume(dev);
798 } else {
799 pci_pm_reenable_device(pci_dev);
800 }
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100801
Rafael J. Wysocki999cce42009-09-09 23:51:27 +0200802 return error;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100803}
804
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200805#else /* !CONFIG_SUSPEND */
806
807#define pci_pm_suspend NULL
808#define pci_pm_suspend_noirq NULL
809#define pci_pm_resume NULL
810#define pci_pm_resume_noirq NULL
811
812#endif /* !CONFIG_SUSPEND */
813
Rafael J. Wysocki1f112ce2011-04-11 22:54:42 +0200814#ifdef CONFIG_HIBERNATE_CALLBACKS
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200815
Sebastian Ott699c1982013-08-20 16:41:02 +0200816
817/*
818 * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing
819 * a hibernate transition
820 */
821struct dev_pm_ops __weak pcibios_pm_ops;
822
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200823static int pci_pm_freeze(struct device *dev)
824{
825 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700826 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200827
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100828 if (pci_has_legacy_pm_support(pci_dev))
829 return pci_legacy_suspend(dev, PMSG_FREEZE);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100830
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100831 if (!pm) {
832 pci_pm_default_suspend(pci_dev);
833 return 0;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200834 }
835
Rafael J. Wysocki7cd06022014-02-26 01:00:30 +0100836 /*
837 * This used to be done in pci_pm_prepare() for all devices and some
838 * drivers may depend on it, so do it here. Ideally, runtime-suspended
839 * devices should not be touched during freeze/thaw transitions,
840 * however.
841 */
842 pm_runtime_resume(dev);
843
Rafael J. Wysocki82fee4d2013-02-04 15:56:05 +0400844 pci_dev->state_saved = false;
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100845 if (pm->freeze) {
846 int error;
847
848 error = pm->freeze(dev);
849 suspend_report_result(pm->freeze, error);
850 if (error)
851 return error;
852 }
853
Sebastian Ott699c1982013-08-20 16:41:02 +0200854 if (pcibios_pm_ops.freeze)
855 return pcibios_pm_ops.freeze(dev);
856
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100857 return 0;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200858}
859
860static int pci_pm_freeze_noirq(struct device *dev)
861{
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100862 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200863 struct device_driver *drv = dev->driver;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200864
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100865 if (pci_has_legacy_pm_support(pci_dev))
866 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
867
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100868 if (drv && drv->pm && drv->pm->freeze_noirq) {
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100869 int error;
870
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100871 error = drv->pm->freeze_noirq(dev);
872 suspend_report_result(drv->pm->freeze_noirq, error);
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100873 if (error)
874 return error;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200875 }
876
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100877 if (!pci_dev->state_saved)
878 pci_save_state(pci_dev);
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100879
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100880 pci_pm_set_unknown_state(pci_dev);
881
Sebastian Ott699c1982013-08-20 16:41:02 +0200882 if (pcibios_pm_ops.freeze_noirq)
883 return pcibios_pm_ops.freeze_noirq(dev);
884
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100885 return 0;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200886}
887
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200888static int pci_pm_thaw_noirq(struct device *dev)
889{
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100890 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200891 struct device_driver *drv = dev->driver;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200892 int error = 0;
893
Sebastian Ott699c1982013-08-20 16:41:02 +0200894 if (pcibios_pm_ops.thaw_noirq) {
895 error = pcibios_pm_ops.thaw_noirq(dev);
896 if (error)
897 return error;
898 }
899
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100900 if (pci_has_legacy_pm_support(pci_dev))
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100901 return pci_legacy_resume_early(dev);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100902
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100903 pci_update_current_state(pci_dev, PCI_D0);
904
905 if (drv && drv->pm && drv->pm->thaw_noirq)
906 error = drv->pm->thaw_noirq(dev);
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200907
908 return error;
909}
910
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100911static int pci_pm_thaw(struct device *dev)
912{
913 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700914 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100915 int error = 0;
916
Sebastian Ott699c1982013-08-20 16:41:02 +0200917 if (pcibios_pm_ops.thaw) {
918 error = pcibios_pm_ops.thaw(dev);
919 if (error)
920 return error;
921 }
922
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100923 if (pci_has_legacy_pm_support(pci_dev))
924 return pci_legacy_resume(dev);
925
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100926 if (pm) {
927 if (pm->thaw)
928 error = pm->thaw(dev);
929 } else {
930 pci_pm_reenable_device(pci_dev);
931 }
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100932
Rafael J. Wysocki4b77b0a2009-09-09 23:49:59 +0200933 pci_dev->state_saved = false;
934
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100935 return error;
936}
937
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200938static int pci_pm_poweroff(struct device *dev)
939{
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100940 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700941 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200942
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100943 if (pci_has_legacy_pm_support(pci_dev))
944 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100945
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100946 if (!pm) {
947 pci_pm_default_suspend(pci_dev);
948 goto Fixup;
949 }
950
Rafael J. Wysocki7cd06022014-02-26 01:00:30 +0100951 /* The reason to do that is the same as in pci_pm_suspend(). */
952 pm_runtime_resume(dev);
953
Rafael J. Wysocki82fee4d2013-02-04 15:56:05 +0400954 pci_dev->state_saved = false;
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100955 if (pm->poweroff) {
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100956 int error;
957
Rafael J. Wysockiddb7c9d2009-02-04 01:56:14 +0100958 error = pm->poweroff(dev);
959 suspend_report_result(pm->poweroff, error);
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100960 if (error)
961 return error;
962 }
963
964 Fixup:
965 pci_fixup_device(pci_fixup_suspend, pci_dev);
966
Sebastian Ott699c1982013-08-20 16:41:02 +0200967 if (pcibios_pm_ops.poweroff)
968 return pcibios_pm_ops.poweroff(dev);
969
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100970 return 0;
971}
972
973static int pci_pm_poweroff_noirq(struct device *dev)
974{
975 struct pci_dev *pci_dev = to_pci_dev(dev);
976 struct device_driver *drv = dev->driver;
977
978 if (pci_has_legacy_pm_support(to_pci_dev(dev)))
979 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
980
981 if (!drv || !drv->pm)
982 return 0;
983
984 if (drv->pm->poweroff_noirq) {
985 int error;
986
987 error = drv->pm->poweroff_noirq(dev);
988 suspend_report_result(drv->pm->poweroff_noirq, error);
989 if (error)
990 return error;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200991 }
992
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100993 if (!pci_dev->state_saved && !pci_is_bridge(pci_dev))
994 pci_prepare_to_sleep(pci_dev);
995
Rafael J. Wysocki0b68c8e2012-08-12 23:26:07 +0200996 /*
997 * The reason for doing this here is the same as for the analogous code
998 * in pci_pm_suspend_noirq().
999 */
1000 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
1001 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
1002
Sebastian Ott699c1982013-08-20 16:41:02 +02001003 if (pcibios_pm_ops.poweroff_noirq)
1004 return pcibios_pm_ops.poweroff_noirq(dev);
1005
Rafael J. Wysocki46939f82009-03-16 22:40:26 +01001006 return 0;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001007}
1008
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001009static int pci_pm_restore_noirq(struct device *dev)
1010{
1011 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001012 struct device_driver *drv = dev->driver;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001013 int error = 0;
1014
Sebastian Ott699c1982013-08-20 16:41:02 +02001015 if (pcibios_pm_ops.restore_noirq) {
1016 error = pcibios_pm_ops.restore_noirq(dev);
1017 if (error)
1018 return error;
1019 }
1020
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001021 pci_pm_default_resume_early(pci_dev);
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +01001022
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +01001023 if (pci_has_legacy_pm_support(pci_dev))
Rafael J. Wysockibb808942009-01-07 14:15:17 +01001024 return pci_legacy_resume_early(dev);
Rafael J. Wysockibb808942009-01-07 14:15:17 +01001025
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +01001026 if (drv && drv->pm && drv->pm->restore_noirq)
1027 error = drv->pm->restore_noirq(dev);
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001028
1029 return error;
1030}
1031
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +01001032static int pci_pm_restore(struct device *dev)
1033{
1034 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -07001035 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +01001036 int error = 0;
1037
Sebastian Ott699c1982013-08-20 16:41:02 +02001038 if (pcibios_pm_ops.restore) {
1039 error = pcibios_pm_ops.restore(dev);
1040 if (error)
1041 return error;
1042 }
1043
Rafael J. Wysocki418e4da2009-01-26 21:43:08 +01001044 /*
1045 * This is necessary for the hibernation error path in which restore is
1046 * called without restoring the standard config registers of the device.
1047 */
1048 if (pci_dev->state_saved)
1049 pci_restore_standard_config(pci_dev);
1050
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +01001051 if (pci_has_legacy_pm_support(pci_dev))
1052 return pci_legacy_resume(dev);
1053
Rafael J. Wysocki5294e252009-02-04 02:09:07 +01001054 pci_pm_default_resume(pci_dev);
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +01001055
Rafael J. Wysocki5294e252009-02-04 02:09:07 +01001056 if (pm) {
1057 if (pm->restore)
1058 error = pm->restore(dev);
1059 } else {
1060 pci_pm_reenable_device(pci_dev);
1061 }
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +01001062
1063 return error;
1064}
1065
Rafael J. Wysocki1f112ce2011-04-11 22:54:42 +02001066#else /* !CONFIG_HIBERNATE_CALLBACKS */
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001067
1068#define pci_pm_freeze NULL
1069#define pci_pm_freeze_noirq NULL
1070#define pci_pm_thaw NULL
1071#define pci_pm_thaw_noirq NULL
1072#define pci_pm_poweroff NULL
1073#define pci_pm_poweroff_noirq NULL
1074#define pci_pm_restore NULL
1075#define pci_pm_restore_noirq NULL
1076
Rafael J. Wysocki1f112ce2011-04-11 22:54:42 +02001077#endif /* !CONFIG_HIBERNATE_CALLBACKS */
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001078
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001079#ifdef CONFIG_PM_RUNTIME
1080
1081static int pci_pm_runtime_suspend(struct device *dev)
1082{
1083 struct pci_dev *pci_dev = to_pci_dev(dev);
1084 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1085 pci_power_t prev = pci_dev->current_state;
1086 int error;
1087
Huang Ying967577b2012-11-20 16:08:22 +08001088 /*
1089 * If pci_dev->driver is not set (unbound), the device should
1090 * always remain in D0 regardless of the runtime PM status
1091 */
1092 if (!pci_dev->driver)
1093 return 0;
1094
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001095 if (!pm || !pm->runtime_suspend)
1096 return -ENOSYS;
1097
Rafael J. Wysocki82fee4d2013-02-04 15:56:05 +04001098 pci_dev->state_saved = false;
Huang Ying448bd852012-06-23 10:23:51 +08001099 pci_dev->no_d3cold = false;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001100 error = pm->runtime_suspend(dev);
1101 suspend_report_result(pm->runtime_suspend, error);
1102 if (error)
1103 return error;
Huang Ying448bd852012-06-23 10:23:51 +08001104 if (!pci_dev->d3cold_allowed)
1105 pci_dev->no_d3cold = true;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001106
1107 pci_fixup_device(pci_fixup_suspend, pci_dev);
1108
1109 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
1110 && pci_dev->current_state != PCI_UNKNOWN) {
1111 WARN_ONCE(pci_dev->current_state != prev,
1112 "PCI PM: State of device not saved by %pF\n",
1113 pm->runtime_suspend);
1114 return 0;
1115 }
1116
Dave Airlie42eca232012-10-29 17:26:54 -06001117 if (!pci_dev->state_saved) {
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001118 pci_save_state(pci_dev);
Dave Airlie42eca232012-10-29 17:26:54 -06001119 pci_finish_runtime_suspend(pci_dev);
1120 }
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001121
1122 return 0;
1123}
1124
1125static int pci_pm_runtime_resume(struct device *dev)
1126{
Huang Ying448bd852012-06-23 10:23:51 +08001127 int rc;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001128 struct pci_dev *pci_dev = to_pci_dev(dev);
1129 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1130
Huang Ying967577b2012-11-20 16:08:22 +08001131 /*
1132 * If pci_dev->driver is not set (unbound), the device should
1133 * always remain in D0 regardless of the runtime PM status
1134 */
1135 if (!pci_dev->driver)
1136 return 0;
1137
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001138 if (!pm || !pm->runtime_resume)
1139 return -ENOSYS;
1140
Rafael J. Wysockidb288c92012-07-05 15:20:00 -06001141 pci_restore_standard_config(pci_dev);
1142 pci_fixup_device(pci_fixup_resume_early, pci_dev);
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001143 __pci_enable_wake(pci_dev, PCI_D0, true, false);
1144 pci_fixup_device(pci_fixup_resume, pci_dev);
1145
Huang Ying448bd852012-06-23 10:23:51 +08001146 rc = pm->runtime_resume(dev);
1147
1148 pci_dev->runtime_d3cold = false;
1149
1150 return rc;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001151}
1152
1153static int pci_pm_runtime_idle(struct device *dev)
1154{
Huang Ying967577b2012-11-20 16:08:22 +08001155 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001156 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysocki45f0a852013-06-03 21:49:52 +02001157 int ret = 0;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001158
Huang Ying967577b2012-11-20 16:08:22 +08001159 /*
1160 * If pci_dev->driver is not set (unbound), the device should
1161 * always remain in D0 regardless of the runtime PM status
1162 */
1163 if (!pci_dev->driver)
Rafael J. Wysocki45f0a852013-06-03 21:49:52 +02001164 return 0;
Huang Ying967577b2012-11-20 16:08:22 +08001165
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001166 if (!pm)
1167 return -ENOSYS;
1168
Rafael J. Wysocki45f0a852013-06-03 21:49:52 +02001169 if (pm->runtime_idle)
1170 ret = pm->runtime_idle(dev);
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001171
Rafael J. Wysocki45f0a852013-06-03 21:49:52 +02001172 return ret;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001173}
1174
1175#else /* !CONFIG_PM_RUNTIME */
1176
1177#define pci_pm_runtime_suspend NULL
1178#define pci_pm_runtime_resume NULL
1179#define pci_pm_runtime_idle NULL
1180
1181#endif /* !CONFIG_PM_RUNTIME */
1182
Rafael J. Wysockiaa338602011-02-11 00:06:54 +01001183#ifdef CONFIG_PM
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001184
Sachin Kamatf91da042013-10-04 12:04:44 -06001185static const struct dev_pm_ops pci_dev_pm_ops = {
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001186 .prepare = pci_pm_prepare,
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001187 .suspend = pci_pm_suspend,
1188 .resume = pci_pm_resume,
1189 .freeze = pci_pm_freeze,
1190 .thaw = pci_pm_thaw,
1191 .poweroff = pci_pm_poweroff,
1192 .restore = pci_pm_restore,
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001193 .suspend_noirq = pci_pm_suspend_noirq,
1194 .resume_noirq = pci_pm_resume_noirq,
1195 .freeze_noirq = pci_pm_freeze_noirq,
1196 .thaw_noirq = pci_pm_thaw_noirq,
1197 .poweroff_noirq = pci_pm_poweroff_noirq,
1198 .restore_noirq = pci_pm_restore_noirq,
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001199 .runtime_suspend = pci_pm_runtime_suspend,
1200 .runtime_resume = pci_pm_runtime_resume,
1201 .runtime_idle = pci_pm_runtime_idle,
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001202};
1203
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001204#define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001205
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001206#else /* !COMFIG_PM_OPS */
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001207
1208#define PCI_PM_OPS_PTR NULL
1209
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001210#endif /* !COMFIG_PM_OPS */
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001211
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212/**
Laurent riffard863b18f2005-10-27 23:12:54 +02001213 * __pci_register_driver - register a new pci driver
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214 * @drv: the driver structure to register
Laurent riffard863b18f2005-10-27 23:12:54 +02001215 * @owner: owner module of drv
Randy Dunlapf95d8822007-02-10 14:41:56 -08001216 * @mod_name: module name string
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001217 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218 * Adds the driver structure to the list of registered drivers.
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001219 * Returns a negative value on error, otherwise 0.
1220 * If no error occurred, the driver remains registered even if
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221 * no device was claimed during registration.
1222 */
Greg Kroah-Hartman725522b2007-01-15 11:50:02 -08001223int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1224 const char *mod_name)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226 /* initialize common driver fields */
1227 drv->driver.name = drv->name;
1228 drv->driver.bus = &pci_bus_type;
Laurent riffard863b18f2005-10-27 23:12:54 +02001229 drv->driver.owner = owner;
Greg Kroah-Hartman725522b2007-01-15 11:50:02 -08001230 drv->driver.mod_name = mod_name;
Alan Cox50b00752006-08-16 17:42:18 +01001231
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001232 spin_lock_init(&drv->dynids.lock);
1233 INIT_LIST_HEAD(&drv->dynids.list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234
1235 /* register with core */
Konstantin Khlebnikovbfb09a82012-08-08 14:47:51 +04001236 return driver_register(&drv->driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237}
1238
1239/**
1240 * pci_unregister_driver - unregister a pci driver
1241 * @drv: the driver structure to unregister
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001242 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243 * Deletes the driver structure from the list of registered PCI drivers,
1244 * gives it a chance to clean up by calling its remove() function for
1245 * each device it was responsible for, and marks those devices as
1246 * driverless.
1247 */
1248
1249void
1250pci_unregister_driver(struct pci_driver *drv)
1251{
1252 driver_unregister(&drv->driver);
1253 pci_free_dynids(drv);
1254}
1255
1256static struct pci_driver pci_compat_driver = {
1257 .name = "compat"
1258};
1259
1260/**
1261 * pci_dev_driver - get the pci_driver of a device
1262 * @dev: the device to query
1263 *
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001264 * Returns the appropriate pci_driver structure or %NULL if there is no
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265 * registered driver for the device.
1266 */
1267struct pci_driver *
1268pci_dev_driver(const struct pci_dev *dev)
1269{
1270 if (dev->driver)
1271 return dev->driver;
1272 else {
1273 int i;
1274 for(i=0; i<=PCI_ROM_RESOURCE; i++)
1275 if (dev->resource[i].flags & IORESOURCE_BUSY)
1276 return &pci_compat_driver;
1277 }
1278 return NULL;
1279}
1280
1281/**
1282 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283 * @dev: the PCI device structure to match against
Randy Dunlap8f7020d2005-10-23 11:57:38 -07001284 * @drv: the device driver to search for matching PCI device id structures
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001285 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286 * Used by a driver to check whether a PCI device present in the
Randy Dunlap8f7020d2005-10-23 11:57:38 -07001287 * system is in its list of supported devices. Returns the matching
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288 * pci_device_id structure or %NULL if there is no match.
1289 */
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001290static int pci_bus_match(struct device *dev, struct device_driver *drv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291{
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001292 struct pci_dev *pci_dev = to_pci_dev(dev);
Yinghai Lu58d9a382013-01-21 13:20:51 -08001293 struct pci_driver *pci_drv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294 const struct pci_device_id *found_id;
1295
Yinghai Lu58d9a382013-01-21 13:20:51 -08001296 if (!pci_dev->match_driver)
1297 return 0;
1298
1299 pci_drv = to_pci_driver(drv);
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001300 found_id = pci_match_device(pci_drv, pci_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301 if (found_id)
1302 return 1;
1303
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001304 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305}
1306
1307/**
1308 * pci_dev_get - increments the reference count of the pci device structure
1309 * @dev: the device being referenced
1310 *
1311 * Each live reference to a device should be refcounted.
1312 *
1313 * Drivers for PCI devices should normally record such references in
1314 * their probe() methods, when they bind to a device, and release
1315 * them by calling pci_dev_put(), in their disconnect() methods.
1316 *
1317 * A pointer to the device with the incremented reference counter is returned.
1318 */
1319struct pci_dev *pci_dev_get(struct pci_dev *dev)
1320{
1321 if (dev)
1322 get_device(&dev->dev);
1323 return dev;
1324}
1325
1326/**
1327 * pci_dev_put - release a use of the pci device structure
1328 * @dev: device that's been disconnected
1329 *
1330 * Must be called when a user of a device is finished with it. When the last
1331 * user of the device calls this function, the memory of the device is freed.
1332 */
1333void pci_dev_put(struct pci_dev *dev)
1334{
1335 if (dev)
1336 put_device(&dev->dev);
1337}
1338
Bill Pemberton8ccc9aa2012-11-21 15:34:58 -05001339static int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1340{
1341 struct pci_dev *pdev;
1342
1343 if (!dev)
1344 return -ENODEV;
1345
1346 pdev = to_pci_dev(dev);
1347 if (!pdev)
1348 return -ENODEV;
1349
1350 if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
1351 return -ENOMEM;
1352
1353 if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
1354 return -ENOMEM;
1355
1356 if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
1357 pdev->subsystem_device))
1358 return -ENOMEM;
1359
1360 if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
1361 return -ENOMEM;
1362
1363 if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x",
1364 pdev->vendor, pdev->device,
1365 pdev->subsystem_vendor, pdev->subsystem_device,
1366 (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
1367 (u8)(pdev->class)))
1368 return -ENOMEM;
1369 return 0;
1370}
1371
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372struct bus_type pci_bus_type = {
1373 .name = "pci",
1374 .match = pci_bus_match,
Kay Sievers312c0042005-11-16 09:00:00 +01001375 .uevent = pci_uevent,
Russell Kingb15d6862006-01-05 14:30:22 +00001376 .probe = pci_device_probe,
1377 .remove = pci_device_remove,
Linus Torvaldscbd69db2006-06-24 14:50:29 -07001378 .shutdown = pci_device_shutdown,
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -07001379 .dev_groups = pci_dev_groups,
Greg Kroah-Hartman0f49ba52013-10-07 14:51:02 -06001380 .bus_groups = pci_bus_groups,
Greg Kroah-Hartman2229c1f2013-10-07 14:51:20 -06001381 .drv_groups = pci_drv_groups,
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001382 .pm = PCI_PM_OPS_PTR,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383};
1384
1385static int __init pci_driver_init(void)
1386{
1387 return bus_register(&pci_bus_type);
1388}
1389
1390postcore_initcall(pci_driver_init);
1391
Tejun Heo9dba9102009-09-03 15:26:36 +09001392EXPORT_SYMBOL_GPL(pci_add_dynid);
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001393EXPORT_SYMBOL(pci_match_id);
Laurent riffard863b18f2005-10-27 23:12:54 +02001394EXPORT_SYMBOL(__pci_register_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395EXPORT_SYMBOL(pci_unregister_driver);
1396EXPORT_SYMBOL(pci_dev_driver);
1397EXPORT_SYMBOL(pci_bus_type);
1398EXPORT_SYMBOL(pci_dev_get);
1399EXPORT_SYMBOL(pci_dev_put);