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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;
Tejun Heo9dba9102009-09-03 15:26:36 +090058
59 dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
60 if (!dynid)
61 return -ENOMEM;
62
63 dynid->id.vendor = vendor;
64 dynid->id.device = device;
65 dynid->id.subvendor = subvendor;
66 dynid->id.subdevice = subdevice;
67 dynid->id.class = class;
68 dynid->id.class_mask = class_mask;
69 dynid->id.driver_data = driver_data;
70
71 spin_lock(&drv->dynids.lock);
72 list_add_tail(&dynid->node, &drv->dynids.list);
73 spin_unlock(&drv->dynids.lock);
74
Tobias Klauser3b7f1012014-07-25 10:36:14 +020075 return driver_attach(&drv->driver);
Tejun Heo9dba9102009-09-03 15:26:36 +090076}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -060077EXPORT_SYMBOL_GPL(pci_add_dynid);
Tejun Heo9dba9102009-09-03 15:26:36 +090078
79static void pci_free_dynids(struct pci_driver *drv)
80{
81 struct pci_dynid *dynid, *n;
82
83 spin_lock(&drv->dynids.lock);
84 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
85 list_del(&dynid->node);
86 kfree(dynid);
87 }
88 spin_unlock(&drv->dynids.lock);
89}
90
Tejun Heo9dba9102009-09-03 15:26:36 +090091/**
92 * store_new_id - sysfs frontend to pci_add_dynid()
Randy Dunlap8f7020d2005-10-23 11:57:38 -070093 * @driver: target device driver
94 * @buf: buffer for scanning device ID data
95 * @count: input size
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 *
Tejun Heo9dba9102009-09-03 15:26:36 +090097 * Allow PCI IDs to be added to an existing driver via sysfs.
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -040099static ssize_t store_new_id(struct device_driver *driver, const char *buf,
100 size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 struct pci_driver *pdrv = to_pci_driver(driver);
Jean Delvareb41d6cf2008-08-17 21:06:59 +0200103 const struct pci_device_id *ids = pdrv->id_table;
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400104 __u32 vendor, device, subvendor = PCI_ANY_ID,
105 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
106 unsigned long driver_data = 0;
107 int fields = 0;
Bandan Das8895d3b2014-04-01 21:32:59 -0400108 int retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
Jean Delvareb41d6cf2008-08-17 21:06:59 +0200110 fields = sscanf(buf, "%x %x %x %x %x %x %lx",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 &vendor, &device, &subvendor, &subdevice,
112 &class, &class_mask, &driver_data);
Jean Delvare6ba18632007-04-07 17:21:28 +0200113 if (fields < 2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 return -EINVAL;
115
Bandan Das8895d3b2014-04-01 21:32:59 -0400116 if (fields != 7) {
117 struct pci_dev *pdev = kzalloc(sizeof(*pdev), GFP_KERNEL);
118 if (!pdev)
119 return -ENOMEM;
120
121 pdev->vendor = vendor;
122 pdev->device = device;
123 pdev->subsystem_vendor = subvendor;
124 pdev->subsystem_device = subdevice;
125 pdev->class = class;
126
127 if (pci_match_id(pdrv->id_table, pdev))
128 retval = -EEXIST;
129
130 kfree(pdev);
131
132 if (retval)
133 return retval;
134 }
135
Jean Delvareb41d6cf2008-08-17 21:06:59 +0200136 /* Only accept driver_data values that match an existing id_table
137 entry */
Chris Wright2debb4d2008-11-25 19:36:10 -0800138 if (ids) {
139 retval = -EINVAL;
140 while (ids->vendor || ids->subvendor || ids->class_mask) {
141 if (driver_data == ids->driver_data) {
142 retval = 0;
143 break;
144 }
145 ids++;
Jean Delvareb41d6cf2008-08-17 21:06:59 +0200146 }
Chris Wright2debb4d2008-11-25 19:36:10 -0800147 if (retval) /* No match */
148 return retval;
Jean Delvareb41d6cf2008-08-17 21:06:59 +0200149 }
Jean Delvareb41d6cf2008-08-17 21:06:59 +0200150
Tejun Heo9dba9102009-09-03 15:26:36 +0900151 retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice,
152 class, class_mask, driver_data);
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700153 if (retval)
154 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 return count;
156}
Greg Kroah-Hartman2229c1f2013-10-07 14:51:20 -0600157static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
Chris Wright09943752009-02-23 21:52:23 -0800159/**
160 * store_remove_id - remove a PCI device ID from this driver
161 * @driver: target device driver
162 * @buf: buffer for scanning device ID data
163 * @count: input size
164 *
165 * Removes a dynamic pci device ID to this driver.
166 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400167static ssize_t store_remove_id(struct device_driver *driver, const char *buf,
168 size_t count)
Chris Wright09943752009-02-23 21:52:23 -0800169{
170 struct pci_dynid *dynid, *n;
171 struct pci_driver *pdrv = to_pci_driver(driver);
172 __u32 vendor, device, subvendor = PCI_ANY_ID,
173 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
174 int fields = 0;
175 int retval = -ENODEV;
176
177 fields = sscanf(buf, "%x %x %x %x %x %x",
178 &vendor, &device, &subvendor, &subdevice,
179 &class, &class_mask);
180 if (fields < 2)
181 return -EINVAL;
182
183 spin_lock(&pdrv->dynids.lock);
184 list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) {
185 struct pci_device_id *id = &dynid->id;
186 if ((id->vendor == vendor) &&
187 (id->device == device) &&
188 (subvendor == PCI_ANY_ID || id->subvendor == subvendor) &&
189 (subdevice == PCI_ANY_ID || id->subdevice == subdevice) &&
190 !((id->class ^ class) & class_mask)) {
191 list_del(&dynid->node);
192 kfree(dynid);
193 retval = 0;
194 break;
195 }
196 }
197 spin_unlock(&pdrv->dynids.lock);
198
199 if (retval)
200 return retval;
201 return count;
202}
Greg Kroah-Hartman2229c1f2013-10-07 14:51:20 -0600203static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id);
Chris Wright09943752009-02-23 21:52:23 -0800204
Greg Kroah-Hartman2229c1f2013-10-07 14:51:20 -0600205static struct attribute *pci_drv_attrs[] = {
206 &driver_attr_new_id.attr,
207 &driver_attr_remove_id.attr,
208 NULL,
Konstantin Khlebnikovbfb09a82012-08-08 14:47:51 +0400209};
Greg Kroah-Hartman2229c1f2013-10-07 14:51:20 -0600210ATTRIBUTE_GROUPS(pci_drv);
Alan Sterned283e92012-01-24 14:35:13 -0500211
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212/**
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700213 * pci_match_id - See if a pci device matches a given pci_id table
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 * @ids: array of PCI device id structures to search in
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700215 * @dev: the PCI device structure to match against.
216 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 * Used by a driver to check whether a PCI device present in the
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700218 * system is in its list of supported devices. Returns the matching
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 * pci_device_id structure or %NULL if there is no match.
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700220 *
Randy Dunlap8b607562007-05-09 07:19:14 +0200221 * Deprecated, don't use this as it will not catch any dynamic ids
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700222 * that a driver might want to check for.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 */
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700224const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
225 struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226{
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700227 if (ids) {
228 while (ids->vendor || ids->subvendor || ids->class_mask) {
229 if (pci_match_one_device(ids, dev))
230 return ids;
231 ids++;
232 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 }
234 return NULL;
235}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -0600236EXPORT_SYMBOL(pci_match_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237
Alex Williamson782a9852014-05-20 08:53:21 -0600238static const struct pci_device_id pci_device_id_any = {
239 .vendor = PCI_ANY_ID,
240 .device = PCI_ANY_ID,
241 .subvendor = PCI_ANY_ID,
242 .subdevice = PCI_ANY_ID,
243};
244
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245/**
Randy Dunlapae9608a2007-01-09 21:41:01 -0800246 * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700247 * @drv: the PCI driver to match against
Henrik Kretzschmar39ba4872006-08-15 10:57:16 +0200248 * @dev: the PCI device structure to match against
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700249 *
250 * Used by a driver to check whether a PCI device present in the
251 * system is in its list of supported devices. Returns the matching
252 * pci_device_id structure or %NULL if there is no match.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 */
Adrian Bunkd73460d2007-10-24 18:27:18 +0200254static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
255 struct pci_dev *dev)
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700256{
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700257 struct pci_dynid *dynid;
Alex Williamson782a9852014-05-20 08:53:21 -0600258 const struct pci_device_id *found_id = NULL;
259
260 /* When driver_override is set, only bind to the matching driver */
261 if (dev->driver_override && strcmp(dev->driver_override, drv->name))
262 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
Russell King7461b602006-11-29 21:18:04 +0000264 /* Look at the dynamic ids first, before the static ones */
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700265 spin_lock(&drv->dynids.lock);
266 list_for_each_entry(dynid, &drv->dynids.list, node) {
267 if (pci_match_one_device(&dynid->id, dev)) {
Alex Williamson782a9852014-05-20 08:53:21 -0600268 found_id = &dynid->id;
269 break;
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700270 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 }
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700272 spin_unlock(&drv->dynids.lock);
Russell King7461b602006-11-29 21:18:04 +0000273
Alex Williamson782a9852014-05-20 08:53:21 -0600274 if (!found_id)
275 found_id = pci_match_id(drv->id_table, dev);
276
277 /* driver_override will always match, send a dummy id */
278 if (!found_id && dev->driver_override)
279 found_id = &pci_device_id_any;
280
281 return found_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282}
283
Rusty Russell873392c2008-12-31 23:54:56 +1030284struct drv_dev_and_id {
285 struct pci_driver *drv;
286 struct pci_dev *dev;
287 const struct pci_device_id *id;
288};
289
290static long local_pci_probe(void *_ddi)
291{
292 struct drv_dev_and_id *ddi = _ddi;
Huang Ying967577b2012-11-20 16:08:22 +0800293 struct pci_dev *pci_dev = ddi->dev;
294 struct pci_driver *pci_drv = ddi->drv;
295 struct device *dev = &pci_dev->dev;
Alan Sternf3ec4f82010-06-08 15:23:51 -0400296 int rc;
Rusty Russell873392c2008-12-31 23:54:56 +1030297
Huang Ying967577b2012-11-20 16:08:22 +0800298 /*
299 * Unbound PCI devices are always put in D0, regardless of
300 * runtime PM status. During probe, the device is set to
301 * active and the usage count is incremented. If the driver
302 * supports runtime PM, it should call pm_runtime_put_noidle()
303 * in its probe routine and pm_runtime_get_noresume() in its
304 * remove routine.
Alan Sternf3ec4f82010-06-08 15:23:51 -0400305 */
Huang Ying967577b2012-11-20 16:08:22 +0800306 pm_runtime_get_sync(dev);
307 pci_dev->driver = pci_drv;
308 rc = pci_drv->probe(pci_dev, ddi->id);
Stephen M. Cameronf92d74c2013-11-01 14:34:55 -0500309 if (!rc)
310 return rc;
311 if (rc < 0) {
Huang Ying967577b2012-11-20 16:08:22 +0800312 pci_dev->driver = NULL;
313 pm_runtime_put_sync(dev);
Stephen M. Cameronf92d74c2013-11-01 14:34:55 -0500314 return rc;
Alan Sternf3ec4f82010-06-08 15:23:51 -0400315 }
Stephen M. Cameronf92d74c2013-11-01 14:34:55 -0500316 /*
317 * Probe function should return < 0 for failure, 0 for success
318 * Treat values > 0 as success, but warn.
319 */
320 dev_warn(dev, "Driver probe function unexpectedly returned %d\n", rc);
321 return 0;
Rusty Russell873392c2008-12-31 23:54:56 +1030322}
323
Andi Kleend42c6992005-07-06 19:56:03 +0200324static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
325 const struct pci_device_id *id)
326{
Rusty Russell873392c2008-12-31 23:54:56 +1030327 int error, node;
328 struct drv_dev_and_id ddi = { drv, dev, id };
Mike Travisf70316d2008-04-04 18:11:06 -0700329
Alexander Duyck12c31562013-11-18 10:59:59 -0700330 /*
331 * Execute driver initialization on node where the device is
332 * attached. This way the driver likely allocates its local memory
333 * on the right node.
334 */
Rusty Russell873392c2008-12-31 23:54:56 +1030335 node = dev_to_node(&dev->dev);
Alexander Duyck12c31562013-11-18 10:59:59 -0700336
337 /*
338 * On NUMA systems, we are likely to call a PF probe function using
339 * work_on_cpu(). If that probe calls pci_enable_sriov() (which
340 * adds the VF devices via pci_bus_add_device()), we may re-enter
341 * this function to call the VF probe function. Calling
342 * work_on_cpu() again will cause a lockdep warning. Since VFs are
343 * always on the same node as the PF, we can work around this by
344 * avoiding work_on_cpu() when we're already on the correct node.
345 *
346 * Preemption is enabled, so it's theoretically unsafe to use
347 * numa_node_id(), but even if we run the probe function on the
348 * wrong node, it should be functionally correct.
349 */
350 if (node >= 0 && node != numa_node_id()) {
Rusty Russell873392c2008-12-31 23:54:56 +1030351 int cpu;
Rusty Russell873392c2008-12-31 23:54:56 +1030352
353 get_online_cpus();
Rusty Russella70f7302009-03-13 14:49:46 +1030354 cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask);
Rusty Russell873392c2008-12-31 23:54:56 +1030355 if (cpu < nr_cpu_ids)
356 error = work_on_cpu(cpu, local_pci_probe, &ddi);
357 else
358 error = local_pci_probe(&ddi);
359 put_online_cpus();
360 } else
361 error = local_pci_probe(&ddi);
Alexander Duyck12c31562013-11-18 10:59:59 -0700362
Andi Kleend42c6992005-07-06 19:56:03 +0200363 return error;
364}
365
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366/**
Randy Dunlap23ea3792010-11-18 15:02:31 -0800367 * __pci_device_probe - check if a driver wants to claim a specific PCI device
Randy Dunlap8f7020d2005-10-23 11:57:38 -0700368 * @drv: driver to call to check if it wants the PCI device
369 * @pci_dev: PCI device being probed
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700370 *
Randy Dunlap8f7020d2005-10-23 11:57:38 -0700371 * returns 0 on success, else error.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
373 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400374static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700375{
376 const struct pci_device_id *id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 int error = 0;
378
379 if (!pci_dev->driver && drv->probe) {
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700380 error = -ENODEV;
381
382 id = pci_match_device(drv, pci_dev);
383 if (id)
Andi Kleend42c6992005-07-06 19:56:03 +0200384 error = pci_call_probe(drv, pci_dev, id);
Huang Ying967577b2012-11-20 16:08:22 +0800385 if (error >= 0)
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700386 error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 }
388 return error;
389}
390
Jiang Liu890e4842015-06-10 16:54:58 +0800391int __weak pcibios_alloc_irq(struct pci_dev *dev)
392{
393 return 0;
394}
395
396void __weak pcibios_free_irq(struct pci_dev *dev)
397{
398}
399
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400400static int pci_device_probe(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401{
Jiang Liu890e4842015-06-10 16:54:58 +0800402 int error;
403 struct pci_dev *pci_dev = to_pci_dev(dev);
404 struct pci_driver *drv = to_pci_driver(dev->driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405
Jiang Liu890e4842015-06-10 16:54:58 +0800406 error = pcibios_alloc_irq(pci_dev);
407 if (error < 0)
408 return error;
409
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 pci_dev_get(pci_dev);
411 error = __pci_device_probe(drv, pci_dev);
Jiang Liu890e4842015-06-10 16:54:58 +0800412 if (error) {
413 pcibios_free_irq(pci_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 pci_dev_put(pci_dev);
Jiang Liu890e4842015-06-10 16:54:58 +0800415 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416
417 return error;
418}
419
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400420static int pci_device_remove(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400422 struct pci_dev *pci_dev = to_pci_dev(dev);
423 struct pci_driver *drv = pci_dev->driver;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
425 if (drv) {
Alan Sternf3ec4f82010-06-08 15:23:51 -0400426 if (drv->remove) {
427 pm_runtime_get_sync(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 drv->remove(pci_dev);
Alan Sternf3ec4f82010-06-08 15:23:51 -0400429 pm_runtime_put_noidle(dev);
430 }
Jiang Liu890e4842015-06-10 16:54:58 +0800431 pcibios_free_irq(pci_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 pci_dev->driver = NULL;
433 }
434
Alan Sternf3ec4f82010-06-08 15:23:51 -0400435 /* Undo the runtime PM settings in local_pci_probe() */
Huang Ying967577b2012-11-20 16:08:22 +0800436 pm_runtime_put_sync(dev);
Alan Sternf3ec4f82010-06-08 15:23:51 -0400437
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 /*
Shaohua Li2449e062006-10-20 14:45:32 -0700439 * If the device is still on, set the power state as "unknown",
440 * since it might change by the next time we load the driver.
441 */
442 if (pci_dev->current_state == PCI_D0)
443 pci_dev->current_state = PCI_UNKNOWN;
444
445 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 * We would love to complain here if pci_dev->is_enabled is set, that
447 * the driver should have called pci_disable_device(), but the
448 * unfortunate fact is there are too many odd BIOS and bridge setups
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700449 * that don't like drivers doing that all of the time.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 * Oh well, we can dream of sane hardware when we sleep, no matter how
451 * horrible the crap we have to deal with is when we are awake...
452 */
453
454 pci_dev_put(pci_dev);
455 return 0;
456}
457
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200458static void pci_device_shutdown(struct device *dev)
459{
460 struct pci_dev *pci_dev = to_pci_dev(dev);
461 struct pci_driver *drv = pci_dev->driver;
462
Huang Ying3ff2de92012-10-24 14:54:14 +0800463 pm_runtime_resume(dev);
464
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200465 if (drv && drv->shutdown)
466 drv->shutdown(pci_dev);
467 pci_msi_shutdown(pci_dev);
468 pci_msix_shutdown(pci_dev);
Rafael J. Wysocki5b415f12012-02-07 00:50:35 +0100469
Dave Young2965faa2015-09-09 15:38:55 -0700470#ifdef CONFIG_KEXEC_CORE
Rafael J. Wysocki5b415f12012-02-07 00:50:35 +0100471 /*
Khalid Aziz4fc9bbf2013-11-27 15:19:25 -0700472 * If this is a kexec reboot, turn off Bus Master bit on the
473 * device to tell it to not continue to do DMA. Don't touch
474 * devices in D3cold or unknown states.
475 * If it is not a kexec reboot, firmware will hit the PCI
476 * devices with big hammer and stop their DMA any way.
Khalid Azizb566a222012-04-27 13:00:33 -0600477 */
Khalid Aziz4fc9bbf2013-11-27 15:19:25 -0700478 if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
Konstantin Khlebnikov6e0eda32013-03-14 18:49:37 +0400479 pci_clear_master(pci_dev);
Khalid Aziz4fc9bbf2013-11-27 15:19:25 -0700480#endif
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200481}
482
Rafael J. Wysockiaa338602011-02-11 00:06:54 +0100483#ifdef CONFIG_PM
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100484
485/* Auxiliary functions used for system resume and run-time resume. */
486
487/**
488 * pci_restore_standard_config - restore standard config registers of PCI device
489 * @pci_dev: PCI device to handle
490 */
491static int pci_restore_standard_config(struct pci_dev *pci_dev)
492{
493 pci_update_current_state(pci_dev, PCI_UNKNOWN);
494
495 if (pci_dev->current_state != PCI_D0) {
496 int error = pci_set_power_state(pci_dev, PCI_D0);
497 if (error)
498 return error;
499 }
500
Jon Mason1d3c16a2010-11-30 17:43:26 -0600501 pci_restore_state(pci_dev);
502 return 0;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100503}
504
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100505#endif
506
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200507#ifdef CONFIG_PM_SLEEP
508
Rafael J. Wysockidb288c92012-07-05 15:20:00 -0600509static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
510{
511 pci_power_up(pci_dev);
512 pci_restore_state(pci_dev);
513 pci_fixup_device(pci_fixup_resume_early, pci_dev);
514}
515
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200516/*
517 * Default "suspend" method for devices that have no driver provided suspend,
Rafael J. Wysockifa58d302009-01-07 13:03:42 +0100518 * or not even a driver at all (second part).
519 */
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100520static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200521{
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200522 /*
523 * mark its power state as "unknown", since we don't know if
524 * e.g. the BIOS will change its device state when we suspend.
525 */
526 if (pci_dev->current_state == PCI_D0)
527 pci_dev->current_state = PCI_UNKNOWN;
528}
529
530/*
531 * Default "resume" method for devices that have no driver provided resume,
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100532 * or not even a driver at all (second part).
533 */
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100534static int pci_pm_reenable_device(struct pci_dev *pci_dev)
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100535{
536 int retval;
537
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200538 /* if the device was enabled before suspend, reenable */
539 retval = pci_reenable_device(pci_dev);
540 /*
541 * if the device was busmaster before the suspend, make it busmaster
542 * again
543 */
544 if (pci_dev->is_busmaster)
545 pci_set_master(pci_dev);
546
547 return retval;
548}
549
550static int pci_legacy_suspend(struct device *dev, pm_message_t state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400552 struct pci_dev *pci_dev = to_pci_dev(dev);
553 struct pci_driver *drv = pci_dev->driver;
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100554
Andrew Morton02669492006-03-23 01:38:34 -0800555 if (drv && drv->suspend) {
Rafael J. Wysocki99dadce2009-02-04 01:59:09 +0100556 pci_power_t prev = pci_dev->current_state;
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100557 int error;
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +0100558
Frans Pop57ef8022009-03-16 22:39:56 +0100559 error = drv->suspend(pci_dev, state);
560 suspend_report_result(drv->suspend, error);
561 if (error)
562 return error;
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +0100563
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100564 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
Rafael J. Wysocki99dadce2009-02-04 01:59:09 +0100565 && pci_dev->current_state != PCI_UNKNOWN) {
566 WARN_ONCE(pci_dev->current_state != prev,
567 "PCI PM: Device state not saved by %pF\n",
568 drv->suspend);
Rafael J. Wysocki99dadce2009-02-04 01:59:09 +0100569 }
Andrew Morton02669492006-03-23 01:38:34 -0800570 }
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100571
572 pci_fixup_device(pci_fixup_suspend, pci_dev);
573
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100574 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575}
576
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200577static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
Linus Torvaldscbd69db2006-06-24 14:50:29 -0700578{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400579 struct pci_dev *pci_dev = to_pci_dev(dev);
580 struct pci_driver *drv = pci_dev->driver;
Linus Torvaldscbd69db2006-06-24 14:50:29 -0700581
582 if (drv && drv->suspend_late) {
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100583 pci_power_t prev = pci_dev->current_state;
584 int error;
585
Frans Pop57ef8022009-03-16 22:39:56 +0100586 error = drv->suspend_late(pci_dev, state);
587 suspend_report_result(drv->suspend_late, error);
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100588 if (error)
589 return error;
590
591 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
592 && pci_dev->current_state != PCI_UNKNOWN) {
593 WARN_ONCE(pci_dev->current_state != prev,
594 "PCI PM: Device state not saved by %pF\n",
595 drv->suspend_late);
Andreas Noever7d2a01b2014-06-03 22:04:09 +0200596 goto Fixup;
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100597 }
Linus Torvaldscbd69db2006-06-24 14:50:29 -0700598 }
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100599
600 if (!pci_dev->state_saved)
601 pci_save_state(pci_dev);
602
603 pci_pm_set_unknown_state(pci_dev);
604
Andreas Noever7d2a01b2014-06-03 22:04:09 +0200605Fixup:
606 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
607
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100608 return 0;
Linus Torvaldscbd69db2006-06-24 14:50:29 -0700609}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100611static int pci_legacy_resume_early(struct device *dev)
612{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400613 struct pci_dev *pci_dev = to_pci_dev(dev);
614 struct pci_driver *drv = pci_dev->driver;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100615
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +0100616 return drv && drv->resume_early ?
617 drv->resume_early(pci_dev) : 0;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100618}
619
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200620static int pci_legacy_resume(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400622 struct pci_dev *pci_dev = to_pci_dev(dev);
623 struct pci_driver *drv = pci_dev->driver;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100625 pci_fixup_device(pci_fixup_resume, pci_dev);
626
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +0100627 return drv && drv->resume ?
628 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629}
630
Rafael J. Wysocki571ff752009-01-07 13:05:05 +0100631/* Auxiliary functions used by the new power management framework */
632
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100633static void pci_pm_default_resume(struct pci_dev *pci_dev)
Rafael J. Wysocki571ff752009-01-07 13:05:05 +0100634{
Rafael J. Wysocki734104292009-01-07 13:07:15 +0100635 pci_fixup_device(pci_fixup_resume, pci_dev);
636
Yijing Wang326c1cd2014-05-04 12:23:36 +0800637 if (!pci_has_subordinate(pci_dev))
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100638 pci_enable_wake(pci_dev, PCI_D0, false);
Rafael J. Wysocki571ff752009-01-07 13:05:05 +0100639}
640
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100641static void pci_pm_default_suspend(struct pci_dev *pci_dev)
Rafael J. Wysocki734104292009-01-07 13:07:15 +0100642{
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100643 /* Disable non-bridge devices without PM support */
Yijing Wang326c1cd2014-05-04 12:23:36 +0800644 if (!pci_has_subordinate(pci_dev))
Rafael J. Wysockicbbc2f62009-02-04 02:01:15 +0100645 pci_disable_enabled_device(pci_dev);
Rafael J. Wysocki734104292009-01-07 13:07:15 +0100646}
647
Rafael J. Wysocki07e836e2009-01-07 13:06:10 +0100648static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
649{
650 struct pci_driver *drv = pci_dev->driver;
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100651 bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume
Rafael J. Wysocki07e836e2009-01-07 13:06:10 +0100652 || drv->resume_early);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100653
654 /*
655 * Legacy PM support is used by default, so warn if the new framework is
656 * supported as well. Drivers are supposed to support either the
657 * former, or the latter, but not both at the same time.
658 */
David Fries82440a82011-11-20 15:29:46 -0600659 WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n",
660 drv->name, pci_dev->vendor, pci_dev->device);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100661
662 return ret;
Rafael J. Wysocki07e836e2009-01-07 13:06:10 +0100663}
664
Rafael J. Wysocki571ff752009-01-07 13:05:05 +0100665/* New power management framework */
666
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200667static int pci_pm_prepare(struct device *dev)
668{
669 struct device_driver *drv = dev->driver;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200670
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100671 /*
Rafael J. Wysocki7cd06022014-02-26 01:00:30 +0100672 * Devices having power.ignore_children set may still be necessary for
673 * suspending their children in the next phase of device suspend.
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100674 */
Rafael J. Wysocki7cd06022014-02-26 01:00:30 +0100675 if (dev->power.ignore_children)
676 pm_runtime_resume(dev);
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100677
Rafael J. Wysockibac2a902015-01-21 02:17:42 +0100678 if (drv && drv->pm && drv->pm->prepare) {
679 int error = drv->pm->prepare(dev);
680 if (error)
681 return error;
682 }
683 return pci_dev_keep_suspended(to_pci_dev(dev));
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200684}
685
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200686
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100687#else /* !CONFIG_PM_SLEEP */
688
689#define pci_pm_prepare NULL
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100690
691#endif /* !CONFIG_PM_SLEEP */
692
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200693#ifdef CONFIG_SUSPEND
694
695static int pci_pm_suspend(struct device *dev)
696{
697 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700698 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200699
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100700 if (pci_has_legacy_pm_support(pci_dev))
701 return pci_legacy_suspend(dev, PMSG_SUSPEND);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100702
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100703 if (!pm) {
704 pci_pm_default_suspend(pci_dev);
705 goto Fixup;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200706 }
Rafael J. Wysockifa58d302009-01-07 13:03:42 +0100707
Rafael J. Wysocki7cd06022014-02-26 01:00:30 +0100708 /*
709 * PCI devices suspended at run time need to be resumed at this point,
710 * because in general it is necessary to reconfigure them for system
711 * suspend. Namely, if the device is supposed to wake up the system
712 * from the sleep state, we may need to reconfigure it for this purpose.
713 * In turn, if the device is not supposed to wake up the system from the
714 * sleep state, we'll have to prevent it from signaling wake-up.
715 */
716 pm_runtime_resume(dev);
717
Rafael J. Wysocki82fee4d2013-02-04 15:56:05 +0400718 pci_dev->state_saved = false;
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100719 if (pm->suspend) {
720 pci_power_t prev = pci_dev->current_state;
721 int error;
722
723 error = pm->suspend(dev);
724 suspend_report_result(pm->suspend, error);
725 if (error)
726 return error;
727
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100728 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100729 && 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);
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100733 }
734 }
735
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100736 Fixup:
737 pci_fixup_device(pci_fixup_suspend, pci_dev);
738
739 return 0;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200740}
741
742static int pci_pm_suspend_noirq(struct device *dev)
Greg KHc8958172005-04-08 14:53:31 +0900743{
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100744 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700745 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Greg KHc8958172005-04-08 14:53:31 +0900746
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100747 if (pci_has_legacy_pm_support(pci_dev))
748 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
749
Rafael J. Wysocki931ff682009-03-16 22:40:50 +0100750 if (!pm) {
751 pci_save_state(pci_dev);
Andreas Noever7d2a01b2014-06-03 22:04:09 +0200752 goto Fixup;
Rafael J. Wysocki931ff682009-03-16 22:40:50 +0100753 }
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100754
755 if (pm->suspend_noirq) {
756 pci_power_t prev = pci_dev->current_state;
757 int error;
758
759 error = pm->suspend_noirq(dev);
760 suspend_report_result(pm->suspend_noirq, error);
761 if (error)
762 return error;
763
764 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
765 && pci_dev->current_state != PCI_UNKNOWN) {
766 WARN_ONCE(pci_dev->current_state != prev,
767 "PCI PM: State of device not saved by %pF\n",
768 pm->suspend_noirq);
Andreas Noever7d2a01b2014-06-03 22:04:09 +0200769 goto Fixup;
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100770 }
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200771 }
772
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100773 if (!pci_dev->state_saved) {
774 pci_save_state(pci_dev);
Yijing Wang326c1cd2014-05-04 12:23:36 +0800775 if (!pci_has_subordinate(pci_dev))
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100776 pci_prepare_to_sleep(pci_dev);
777 }
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100778
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100779 pci_pm_set_unknown_state(pci_dev);
780
Alan Sterndbf0e4c2012-07-09 11:09:21 -0400781 /*
782 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
783 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
784 * hasn't been quiesced and tries to turn it off. If the controller
785 * is already in D3, this can hang or cause memory corruption.
786 *
787 * Since the value of the COMMAND register doesn't matter once the
788 * device has been suspended, we can safely set it to 0 here.
789 */
790 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
791 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
792
Andreas Noever7d2a01b2014-06-03 22:04:09 +0200793Fixup:
794 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
795
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100796 return 0;
Greg KHc8958172005-04-08 14:53:31 +0900797}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200799static int pci_pm_resume_noirq(struct device *dev)
800{
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100801 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200802 struct device_driver *drv = dev->driver;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200803 int error = 0;
804
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100805 pci_pm_default_resume_early(pci_dev);
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +0100806
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100807 if (pci_has_legacy_pm_support(pci_dev))
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100808 return pci_legacy_resume_early(dev);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100809
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100810 if (drv && drv->pm && drv->pm->resume_noirq)
811 error = drv->pm->resume_noirq(dev);
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200812
813 return error;
814}
815
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100816static int pci_pm_resume(struct device *dev)
817{
818 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700819 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100820 int error = 0;
821
Rafael J. Wysocki418e4da2009-01-26 21:43:08 +0100822 /*
823 * This is necessary for the suspend error path in which resume is
824 * called without restoring the standard config registers of the device.
825 */
826 if (pci_dev->state_saved)
827 pci_restore_standard_config(pci_dev);
828
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100829 if (pci_has_legacy_pm_support(pci_dev))
830 return pci_legacy_resume(dev);
831
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100832 pci_pm_default_resume(pci_dev);
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100833
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100834 if (pm) {
835 if (pm->resume)
836 error = pm->resume(dev);
837 } else {
838 pci_pm_reenable_device(pci_dev);
839 }
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100840
Rafael J. Wysocki999cce42009-09-09 23:51:27 +0200841 return error;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100842}
843
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200844#else /* !CONFIG_SUSPEND */
845
846#define pci_pm_suspend NULL
847#define pci_pm_suspend_noirq NULL
848#define pci_pm_resume NULL
849#define pci_pm_resume_noirq NULL
850
851#endif /* !CONFIG_SUSPEND */
852
Rafael J. Wysocki1f112ce2011-04-11 22:54:42 +0200853#ifdef CONFIG_HIBERNATE_CALLBACKS
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200854
Sebastian Ott699c1982013-08-20 16:41:02 +0200855
856/*
857 * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing
858 * a hibernate transition
859 */
860struct dev_pm_ops __weak pcibios_pm_ops;
861
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200862static int pci_pm_freeze(struct device *dev)
863{
864 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700865 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200866
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100867 if (pci_has_legacy_pm_support(pci_dev))
868 return pci_legacy_suspend(dev, PMSG_FREEZE);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100869
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100870 if (!pm) {
871 pci_pm_default_suspend(pci_dev);
872 return 0;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200873 }
874
Rafael J. Wysocki7cd06022014-02-26 01:00:30 +0100875 /*
876 * This used to be done in pci_pm_prepare() for all devices and some
877 * drivers may depend on it, so do it here. Ideally, runtime-suspended
878 * devices should not be touched during freeze/thaw transitions,
879 * however.
880 */
881 pm_runtime_resume(dev);
882
Rafael J. Wysocki82fee4d2013-02-04 15:56:05 +0400883 pci_dev->state_saved = false;
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100884 if (pm->freeze) {
885 int error;
886
887 error = pm->freeze(dev);
888 suspend_report_result(pm->freeze, error);
889 if (error)
890 return error;
891 }
892
Sebastian Ott699c1982013-08-20 16:41:02 +0200893 if (pcibios_pm_ops.freeze)
894 return pcibios_pm_ops.freeze(dev);
895
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100896 return 0;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200897}
898
899static int pci_pm_freeze_noirq(struct device *dev)
900{
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100901 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200902 struct device_driver *drv = dev->driver;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200903
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100904 if (pci_has_legacy_pm_support(pci_dev))
905 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
906
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100907 if (drv && drv->pm && drv->pm->freeze_noirq) {
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100908 int error;
909
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100910 error = drv->pm->freeze_noirq(dev);
911 suspend_report_result(drv->pm->freeze_noirq, error);
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100912 if (error)
913 return error;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200914 }
915
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100916 if (!pci_dev->state_saved)
917 pci_save_state(pci_dev);
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100918
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100919 pci_pm_set_unknown_state(pci_dev);
920
Sebastian Ott699c1982013-08-20 16:41:02 +0200921 if (pcibios_pm_ops.freeze_noirq)
922 return pcibios_pm_ops.freeze_noirq(dev);
923
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100924 return 0;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200925}
926
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200927static int pci_pm_thaw_noirq(struct device *dev)
928{
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100929 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200930 struct device_driver *drv = dev->driver;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200931 int error = 0;
932
Sebastian Ott699c1982013-08-20 16:41:02 +0200933 if (pcibios_pm_ops.thaw_noirq) {
934 error = pcibios_pm_ops.thaw_noirq(dev);
935 if (error)
936 return error;
937 }
938
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100939 if (pci_has_legacy_pm_support(pci_dev))
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100940 return pci_legacy_resume_early(dev);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100941
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100942 pci_update_current_state(pci_dev, PCI_D0);
943
944 if (drv && drv->pm && drv->pm->thaw_noirq)
945 error = drv->pm->thaw_noirq(dev);
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200946
947 return error;
948}
949
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100950static int pci_pm_thaw(struct device *dev)
951{
952 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700953 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100954 int error = 0;
955
Sebastian Ott699c1982013-08-20 16:41:02 +0200956 if (pcibios_pm_ops.thaw) {
957 error = pcibios_pm_ops.thaw(dev);
958 if (error)
959 return error;
960 }
961
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100962 if (pci_has_legacy_pm_support(pci_dev))
963 return pci_legacy_resume(dev);
964
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100965 if (pm) {
966 if (pm->thaw)
967 error = pm->thaw(dev);
968 } else {
969 pci_pm_reenable_device(pci_dev);
970 }
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100971
Rafael J. Wysocki4b77b0a2009-09-09 23:49:59 +0200972 pci_dev->state_saved = false;
973
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100974 return error;
975}
976
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200977static int pci_pm_poweroff(struct device *dev)
978{
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100979 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700980 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200981
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100982 if (pci_has_legacy_pm_support(pci_dev))
983 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100984
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100985 if (!pm) {
986 pci_pm_default_suspend(pci_dev);
987 goto Fixup;
988 }
989
Rafael J. Wysocki7cd06022014-02-26 01:00:30 +0100990 /* The reason to do that is the same as in pci_pm_suspend(). */
991 pm_runtime_resume(dev);
992
Rafael J. Wysocki82fee4d2013-02-04 15:56:05 +0400993 pci_dev->state_saved = false;
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100994 if (pm->poweroff) {
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100995 int error;
996
Rafael J. Wysockiddb7c9d2009-02-04 01:56:14 +0100997 error = pm->poweroff(dev);
998 suspend_report_result(pm->poweroff, error);
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100999 if (error)
1000 return error;
1001 }
1002
1003 Fixup:
1004 pci_fixup_device(pci_fixup_suspend, pci_dev);
1005
Sebastian Ott699c1982013-08-20 16:41:02 +02001006 if (pcibios_pm_ops.poweroff)
1007 return pcibios_pm_ops.poweroff(dev);
1008
Rafael J. Wysocki46939f82009-03-16 22:40:26 +01001009 return 0;
1010}
1011
1012static int pci_pm_poweroff_noirq(struct device *dev)
1013{
1014 struct pci_dev *pci_dev = to_pci_dev(dev);
1015 struct device_driver *drv = dev->driver;
1016
1017 if (pci_has_legacy_pm_support(to_pci_dev(dev)))
1018 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
1019
Andreas Noever7d2a01b2014-06-03 22:04:09 +02001020 if (!drv || !drv->pm) {
1021 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
Rafael J. Wysocki46939f82009-03-16 22:40:26 +01001022 return 0;
Andreas Noever7d2a01b2014-06-03 22:04:09 +02001023 }
Rafael J. Wysocki46939f82009-03-16 22:40:26 +01001024
1025 if (drv->pm->poweroff_noirq) {
1026 int error;
1027
1028 error = drv->pm->poweroff_noirq(dev);
1029 suspend_report_result(drv->pm->poweroff_noirq, error);
1030 if (error)
1031 return error;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001032 }
1033
Yijing Wang326c1cd2014-05-04 12:23:36 +08001034 if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev))
Rafael J. Wysocki5294e252009-02-04 02:09:07 +01001035 pci_prepare_to_sleep(pci_dev);
1036
Rafael J. Wysocki0b68c8e2012-08-12 23:26:07 +02001037 /*
1038 * The reason for doing this here is the same as for the analogous code
1039 * in pci_pm_suspend_noirq().
1040 */
1041 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
1042 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
1043
Andreas Noever7d2a01b2014-06-03 22:04:09 +02001044 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1045
Sebastian Ott699c1982013-08-20 16:41:02 +02001046 if (pcibios_pm_ops.poweroff_noirq)
1047 return pcibios_pm_ops.poweroff_noirq(dev);
1048
Rafael J. Wysocki46939f82009-03-16 22:40:26 +01001049 return 0;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001050}
1051
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001052static int pci_pm_restore_noirq(struct device *dev)
1053{
1054 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001055 struct device_driver *drv = dev->driver;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001056 int error = 0;
1057
Sebastian Ott699c1982013-08-20 16:41:02 +02001058 if (pcibios_pm_ops.restore_noirq) {
1059 error = pcibios_pm_ops.restore_noirq(dev);
1060 if (error)
1061 return error;
1062 }
1063
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001064 pci_pm_default_resume_early(pci_dev);
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +01001065
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +01001066 if (pci_has_legacy_pm_support(pci_dev))
Rafael J. Wysockibb808942009-01-07 14:15:17 +01001067 return pci_legacy_resume_early(dev);
Rafael J. Wysockibb808942009-01-07 14:15:17 +01001068
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +01001069 if (drv && drv->pm && drv->pm->restore_noirq)
1070 error = drv->pm->restore_noirq(dev);
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001071
1072 return error;
1073}
1074
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +01001075static int pci_pm_restore(struct device *dev)
1076{
1077 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -07001078 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +01001079 int error = 0;
1080
Sebastian Ott699c1982013-08-20 16:41:02 +02001081 if (pcibios_pm_ops.restore) {
1082 error = pcibios_pm_ops.restore(dev);
1083 if (error)
1084 return error;
1085 }
1086
Rafael J. Wysocki418e4da2009-01-26 21:43:08 +01001087 /*
1088 * This is necessary for the hibernation error path in which restore is
1089 * called without restoring the standard config registers of the device.
1090 */
1091 if (pci_dev->state_saved)
1092 pci_restore_standard_config(pci_dev);
1093
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +01001094 if (pci_has_legacy_pm_support(pci_dev))
1095 return pci_legacy_resume(dev);
1096
Rafael J. Wysocki5294e252009-02-04 02:09:07 +01001097 pci_pm_default_resume(pci_dev);
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +01001098
Rafael J. Wysocki5294e252009-02-04 02:09:07 +01001099 if (pm) {
1100 if (pm->restore)
1101 error = pm->restore(dev);
1102 } else {
1103 pci_pm_reenable_device(pci_dev);
1104 }
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +01001105
1106 return error;
1107}
1108
Rafael J. Wysocki1f112ce2011-04-11 22:54:42 +02001109#else /* !CONFIG_HIBERNATE_CALLBACKS */
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001110
1111#define pci_pm_freeze NULL
1112#define pci_pm_freeze_noirq NULL
1113#define pci_pm_thaw NULL
1114#define pci_pm_thaw_noirq NULL
1115#define pci_pm_poweroff NULL
1116#define pci_pm_poweroff_noirq NULL
1117#define pci_pm_restore NULL
1118#define pci_pm_restore_noirq NULL
1119
Rafael J. Wysocki1f112ce2011-04-11 22:54:42 +02001120#endif /* !CONFIG_HIBERNATE_CALLBACKS */
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001121
Rafael J. Wysockifbb988b2014-11-27 23:16:57 +01001122#ifdef CONFIG_PM
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001123
1124static int pci_pm_runtime_suspend(struct device *dev)
1125{
1126 struct pci_dev *pci_dev = to_pci_dev(dev);
1127 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1128 pci_power_t prev = pci_dev->current_state;
1129 int error;
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_suspend)
1139 return -ENOSYS;
1140
Rafael J. Wysocki82fee4d2013-02-04 15:56:05 +04001141 pci_dev->state_saved = false;
Huang Ying448bd852012-06-23 10:23:51 +08001142 pci_dev->no_d3cold = false;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001143 error = pm->runtime_suspend(dev);
1144 suspend_report_result(pm->runtime_suspend, error);
1145 if (error)
1146 return error;
Huang Ying448bd852012-06-23 10:23:51 +08001147 if (!pci_dev->d3cold_allowed)
1148 pci_dev->no_d3cold = true;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001149
1150 pci_fixup_device(pci_fixup_suspend, pci_dev);
1151
1152 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
1153 && pci_dev->current_state != PCI_UNKNOWN) {
1154 WARN_ONCE(pci_dev->current_state != prev,
1155 "PCI PM: State of device not saved by %pF\n",
1156 pm->runtime_suspend);
1157 return 0;
1158 }
1159
Dave Airlie42eca232012-10-29 17:26:54 -06001160 if (!pci_dev->state_saved) {
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001161 pci_save_state(pci_dev);
Dave Airlie42eca232012-10-29 17:26:54 -06001162 pci_finish_runtime_suspend(pci_dev);
1163 }
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001164
1165 return 0;
1166}
1167
1168static int pci_pm_runtime_resume(struct device *dev)
1169{
Huang Ying448bd852012-06-23 10:23:51 +08001170 int rc;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001171 struct pci_dev *pci_dev = to_pci_dev(dev);
1172 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1173
Huang Ying967577b2012-11-20 16:08:22 +08001174 /*
1175 * If pci_dev->driver is not set (unbound), the device should
1176 * always remain in D0 regardless of the runtime PM status
1177 */
1178 if (!pci_dev->driver)
1179 return 0;
1180
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001181 if (!pm || !pm->runtime_resume)
1182 return -ENOSYS;
1183
Rafael J. Wysockidb288c92012-07-05 15:20:00 -06001184 pci_restore_standard_config(pci_dev);
1185 pci_fixup_device(pci_fixup_resume_early, pci_dev);
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001186 __pci_enable_wake(pci_dev, PCI_D0, true, false);
1187 pci_fixup_device(pci_fixup_resume, pci_dev);
1188
Huang Ying448bd852012-06-23 10:23:51 +08001189 rc = pm->runtime_resume(dev);
1190
1191 pci_dev->runtime_d3cold = false;
1192
1193 return rc;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001194}
1195
1196static int pci_pm_runtime_idle(struct device *dev)
1197{
Huang Ying967577b2012-11-20 16:08:22 +08001198 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001199 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysocki45f0a852013-06-03 21:49:52 +02001200 int ret = 0;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001201
Huang Ying967577b2012-11-20 16:08:22 +08001202 /*
1203 * If pci_dev->driver is not set (unbound), the device should
1204 * always remain in D0 regardless of the runtime PM status
1205 */
1206 if (!pci_dev->driver)
Rafael J. Wysocki45f0a852013-06-03 21:49:52 +02001207 return 0;
Huang Ying967577b2012-11-20 16:08:22 +08001208
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001209 if (!pm)
1210 return -ENOSYS;
1211
Rafael J. Wysocki45f0a852013-06-03 21:49:52 +02001212 if (pm->runtime_idle)
1213 ret = pm->runtime_idle(dev);
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001214
Rafael J. Wysocki45f0a852013-06-03 21:49:52 +02001215 return ret;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001216}
1217
Sachin Kamatf91da042013-10-04 12:04:44 -06001218static const struct dev_pm_ops pci_dev_pm_ops = {
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001219 .prepare = pci_pm_prepare,
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001220 .suspend = pci_pm_suspend,
1221 .resume = pci_pm_resume,
1222 .freeze = pci_pm_freeze,
1223 .thaw = pci_pm_thaw,
1224 .poweroff = pci_pm_poweroff,
1225 .restore = pci_pm_restore,
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001226 .suspend_noirq = pci_pm_suspend_noirq,
1227 .resume_noirq = pci_pm_resume_noirq,
1228 .freeze_noirq = pci_pm_freeze_noirq,
1229 .thaw_noirq = pci_pm_thaw_noirq,
1230 .poweroff_noirq = pci_pm_poweroff_noirq,
1231 .restore_noirq = pci_pm_restore_noirq,
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001232 .runtime_suspend = pci_pm_runtime_suspend,
1233 .runtime_resume = pci_pm_runtime_resume,
1234 .runtime_idle = pci_pm_runtime_idle,
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001235};
1236
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001237#define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001238
Rafael J. Wysockifbb988b2014-11-27 23:16:57 +01001239#else /* !CONFIG_PM */
1240
1241#define pci_pm_runtime_suspend NULL
1242#define pci_pm_runtime_resume NULL
1243#define pci_pm_runtime_idle NULL
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001244
1245#define PCI_PM_OPS_PTR NULL
1246
Rafael J. Wysockifbb988b2014-11-27 23:16:57 +01001247#endif /* !CONFIG_PM */
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001248
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249/**
Laurent riffard863b18f2005-10-27 23:12:54 +02001250 * __pci_register_driver - register a new pci driver
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251 * @drv: the driver structure to register
Laurent riffard863b18f2005-10-27 23:12:54 +02001252 * @owner: owner module of drv
Randy Dunlapf95d8822007-02-10 14:41:56 -08001253 * @mod_name: module name string
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001254 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255 * Adds the driver structure to the list of registered drivers.
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001256 * Returns a negative value on error, otherwise 0.
1257 * If no error occurred, the driver remains registered even if
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258 * no device was claimed during registration.
1259 */
Greg Kroah-Hartman725522b2007-01-15 11:50:02 -08001260int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1261 const char *mod_name)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263 /* initialize common driver fields */
1264 drv->driver.name = drv->name;
1265 drv->driver.bus = &pci_bus_type;
Laurent riffard863b18f2005-10-27 23:12:54 +02001266 drv->driver.owner = owner;
Greg Kroah-Hartman725522b2007-01-15 11:50:02 -08001267 drv->driver.mod_name = mod_name;
Alan Cox50b00752006-08-16 17:42:18 +01001268
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001269 spin_lock_init(&drv->dynids.lock);
1270 INIT_LIST_HEAD(&drv->dynids.list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271
1272 /* register with core */
Konstantin Khlebnikovbfb09a82012-08-08 14:47:51 +04001273 return driver_register(&drv->driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -06001275EXPORT_SYMBOL(__pci_register_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276
1277/**
1278 * pci_unregister_driver - unregister a pci driver
1279 * @drv: the driver structure to unregister
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001280 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281 * Deletes the driver structure from the list of registered PCI drivers,
1282 * gives it a chance to clean up by calling its remove() function for
1283 * each device it was responsible for, and marks those devices as
1284 * driverless.
1285 */
1286
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001287void pci_unregister_driver(struct pci_driver *drv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288{
1289 driver_unregister(&drv->driver);
1290 pci_free_dynids(drv);
1291}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -06001292EXPORT_SYMBOL(pci_unregister_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293
1294static struct pci_driver pci_compat_driver = {
1295 .name = "compat"
1296};
1297
1298/**
1299 * pci_dev_driver - get the pci_driver of a device
1300 * @dev: the device to query
1301 *
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001302 * Returns the appropriate pci_driver structure or %NULL if there is no
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303 * registered driver for the device.
1304 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001305struct pci_driver *pci_dev_driver(const struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306{
1307 if (dev->driver)
1308 return dev->driver;
1309 else {
1310 int i;
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001311 for (i = 0; i <= PCI_ROM_RESOURCE; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312 if (dev->resource[i].flags & IORESOURCE_BUSY)
1313 return &pci_compat_driver;
1314 }
1315 return NULL;
1316}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -06001317EXPORT_SYMBOL(pci_dev_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318
1319/**
1320 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321 * @dev: the PCI device structure to match against
Randy Dunlap8f7020d2005-10-23 11:57:38 -07001322 * @drv: the device driver to search for matching PCI device id structures
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001323 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324 * Used by a driver to check whether a PCI device present in the
Randy Dunlap8f7020d2005-10-23 11:57:38 -07001325 * system is in its list of supported devices. Returns the matching
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326 * pci_device_id structure or %NULL if there is no match.
1327 */
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001328static int pci_bus_match(struct device *dev, struct device_driver *drv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329{
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001330 struct pci_dev *pci_dev = to_pci_dev(dev);
Yinghai Lu58d9a382013-01-21 13:20:51 -08001331 struct pci_driver *pci_drv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332 const struct pci_device_id *found_id;
1333
Yinghai Lu58d9a382013-01-21 13:20:51 -08001334 if (!pci_dev->match_driver)
1335 return 0;
1336
1337 pci_drv = to_pci_driver(drv);
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001338 found_id = pci_match_device(pci_drv, pci_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339 if (found_id)
1340 return 1;
1341
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001342 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343}
1344
1345/**
1346 * pci_dev_get - increments the reference count of the pci device structure
1347 * @dev: the device being referenced
1348 *
1349 * Each live reference to a device should be refcounted.
1350 *
1351 * Drivers for PCI devices should normally record such references in
1352 * their probe() methods, when they bind to a device, and release
1353 * them by calling pci_dev_put(), in their disconnect() methods.
1354 *
1355 * A pointer to the device with the incremented reference counter is returned.
1356 */
1357struct pci_dev *pci_dev_get(struct pci_dev *dev)
1358{
1359 if (dev)
1360 get_device(&dev->dev);
1361 return dev;
1362}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -06001363EXPORT_SYMBOL(pci_dev_get);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364
1365/**
1366 * pci_dev_put - release a use of the pci device structure
1367 * @dev: device that's been disconnected
1368 *
1369 * Must be called when a user of a device is finished with it. When the last
1370 * user of the device calls this function, the memory of the device is freed.
1371 */
1372void pci_dev_put(struct pci_dev *dev)
1373{
1374 if (dev)
1375 put_device(&dev->dev);
1376}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -06001377EXPORT_SYMBOL(pci_dev_put);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378
Bill Pemberton8ccc9aa2012-11-21 15:34:58 -05001379static int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1380{
1381 struct pci_dev *pdev;
1382
1383 if (!dev)
1384 return -ENODEV;
1385
1386 pdev = to_pci_dev(dev);
Bill Pemberton8ccc9aa2012-11-21 15:34:58 -05001387
1388 if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
1389 return -ENOMEM;
1390
1391 if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
1392 return -ENOMEM;
1393
1394 if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
1395 pdev->subsystem_device))
1396 return -ENOMEM;
1397
1398 if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
1399 return -ENOMEM;
1400
Ricardo Ribalda Delgado145b3fe2014-12-02 17:35:04 +01001401 if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X",
Bill Pemberton8ccc9aa2012-11-21 15:34:58 -05001402 pdev->vendor, pdev->device,
1403 pdev->subsystem_vendor, pdev->subsystem_device,
1404 (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
1405 (u8)(pdev->class)))
1406 return -ENOMEM;
Bjorn Helgaasefdd4072014-04-05 15:08:22 -06001407
Bill Pemberton8ccc9aa2012-11-21 15:34:58 -05001408 return 0;
1409}
1410
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411struct bus_type pci_bus_type = {
1412 .name = "pci",
1413 .match = pci_bus_match,
Kay Sievers312c0042005-11-16 09:00:00 +01001414 .uevent = pci_uevent,
Russell Kingb15d6862006-01-05 14:30:22 +00001415 .probe = pci_device_probe,
1416 .remove = pci_device_remove,
Linus Torvaldscbd69db2006-06-24 14:50:29 -07001417 .shutdown = pci_device_shutdown,
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -07001418 .dev_groups = pci_dev_groups,
Greg Kroah-Hartman0f49ba52013-10-07 14:51:02 -06001419 .bus_groups = pci_bus_groups,
Greg Kroah-Hartman2229c1f2013-10-07 14:51:20 -06001420 .drv_groups = pci_drv_groups,
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001421 .pm = PCI_PM_OPS_PTR,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422};
Ryan Desfossesb7fe9432014-04-25 14:32:25 -06001423EXPORT_SYMBOL(pci_bus_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424
1425static int __init pci_driver_init(void)
1426{
1427 return bus_register(&pci_bus_type);
1428}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429postcore_initcall(pci_driver_init);