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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
Rafael J. Wysockia8360062015-09-18 03:08:40 +0200302 * supports runtime PM, it should call pm_runtime_put_noidle(),
303 * or any other runtime PM helper function decrementing the usage
304 * count, in its probe routine and pm_runtime_get_noresume() in
305 * its remove routine.
Alan Sternf3ec4f82010-06-08 15:23:51 -0400306 */
Huang Ying967577b2012-11-20 16:08:22 +0800307 pm_runtime_get_sync(dev);
308 pci_dev->driver = pci_drv;
309 rc = pci_drv->probe(pci_dev, ddi->id);
Stephen M. Cameronf92d74c2013-11-01 14:34:55 -0500310 if (!rc)
311 return rc;
312 if (rc < 0) {
Huang Ying967577b2012-11-20 16:08:22 +0800313 pci_dev->driver = NULL;
314 pm_runtime_put_sync(dev);
Stephen M. Cameronf92d74c2013-11-01 14:34:55 -0500315 return rc;
Alan Sternf3ec4f82010-06-08 15:23:51 -0400316 }
Stephen M. Cameronf92d74c2013-11-01 14:34:55 -0500317 /*
318 * Probe function should return < 0 for failure, 0 for success
319 * Treat values > 0 as success, but warn.
320 */
321 dev_warn(dev, "Driver probe function unexpectedly returned %d\n", rc);
322 return 0;
Rusty Russell873392c2008-12-31 23:54:56 +1030323}
324
Andi Kleend42c6992005-07-06 19:56:03 +0200325static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
326 const struct pci_device_id *id)
327{
Rusty Russell873392c2008-12-31 23:54:56 +1030328 int error, node;
329 struct drv_dev_and_id ddi = { drv, dev, id };
Mike Travisf70316d2008-04-04 18:11:06 -0700330
Alexander Duyck12c31562013-11-18 10:59:59 -0700331 /*
332 * Execute driver initialization on node where the device is
333 * attached. This way the driver likely allocates its local memory
334 * on the right node.
335 */
Rusty Russell873392c2008-12-31 23:54:56 +1030336 node = dev_to_node(&dev->dev);
Alexander Duyck12c31562013-11-18 10:59:59 -0700337
338 /*
339 * On NUMA systems, we are likely to call a PF probe function using
340 * work_on_cpu(). If that probe calls pci_enable_sriov() (which
341 * adds the VF devices via pci_bus_add_device()), we may re-enter
342 * this function to call the VF probe function. Calling
343 * work_on_cpu() again will cause a lockdep warning. Since VFs are
344 * always on the same node as the PF, we can work around this by
345 * avoiding work_on_cpu() when we're already on the correct node.
346 *
347 * Preemption is enabled, so it's theoretically unsafe to use
348 * numa_node_id(), but even if we run the probe function on the
349 * wrong node, it should be functionally correct.
350 */
351 if (node >= 0 && node != numa_node_id()) {
Rusty Russell873392c2008-12-31 23:54:56 +1030352 int cpu;
Rusty Russell873392c2008-12-31 23:54:56 +1030353
354 get_online_cpus();
Rusty Russella70f7302009-03-13 14:49:46 +1030355 cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask);
Rusty Russell873392c2008-12-31 23:54:56 +1030356 if (cpu < nr_cpu_ids)
357 error = work_on_cpu(cpu, local_pci_probe, &ddi);
358 else
359 error = local_pci_probe(&ddi);
360 put_online_cpus();
361 } else
362 error = local_pci_probe(&ddi);
Alexander Duyck12c31562013-11-18 10:59:59 -0700363
Andi Kleend42c6992005-07-06 19:56:03 +0200364 return error;
365}
366
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367/**
Randy Dunlap23ea3792010-11-18 15:02:31 -0800368 * __pci_device_probe - check if a driver wants to claim a specific PCI device
Randy Dunlap8f7020d2005-10-23 11:57:38 -0700369 * @drv: driver to call to check if it wants the PCI device
370 * @pci_dev: PCI device being probed
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700371 *
Randy Dunlap8f7020d2005-10-23 11:57:38 -0700372 * returns 0 on success, else error.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
374 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400375static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700376{
377 const struct pci_device_id *id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 int error = 0;
379
380 if (!pci_dev->driver && drv->probe) {
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700381 error = -ENODEV;
382
383 id = pci_match_device(drv, pci_dev);
384 if (id)
Andi Kleend42c6992005-07-06 19:56:03 +0200385 error = pci_call_probe(drv, pci_dev, id);
Huang Ying967577b2012-11-20 16:08:22 +0800386 if (error >= 0)
Greg Kroah-Hartman75865852005-06-30 02:18:12 -0700387 error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 }
389 return error;
390}
391
Jiang Liu890e4842015-06-10 16:54:58 +0800392int __weak pcibios_alloc_irq(struct pci_dev *dev)
393{
394 return 0;
395}
396
397void __weak pcibios_free_irq(struct pci_dev *dev)
398{
399}
400
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400401static int pci_device_probe(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402{
Jiang Liu890e4842015-06-10 16:54:58 +0800403 int error;
404 struct pci_dev *pci_dev = to_pci_dev(dev);
405 struct pci_driver *drv = to_pci_driver(dev->driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
Jiang Liu890e4842015-06-10 16:54:58 +0800407 error = pcibios_alloc_irq(pci_dev);
408 if (error < 0)
409 return error;
410
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 pci_dev_get(pci_dev);
412 error = __pci_device_probe(drv, pci_dev);
Jiang Liu890e4842015-06-10 16:54:58 +0800413 if (error) {
414 pcibios_free_irq(pci_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 pci_dev_put(pci_dev);
Jiang Liu890e4842015-06-10 16:54:58 +0800416 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417
418 return error;
419}
420
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400421static int pci_device_remove(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400423 struct pci_dev *pci_dev = to_pci_dev(dev);
424 struct pci_driver *drv = pci_dev->driver;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425
426 if (drv) {
Alan Sternf3ec4f82010-06-08 15:23:51 -0400427 if (drv->remove) {
428 pm_runtime_get_sync(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 drv->remove(pci_dev);
Alan Sternf3ec4f82010-06-08 15:23:51 -0400430 pm_runtime_put_noidle(dev);
431 }
Jiang Liu890e4842015-06-10 16:54:58 +0800432 pcibios_free_irq(pci_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 pci_dev->driver = NULL;
434 }
435
Alan Sternf3ec4f82010-06-08 15:23:51 -0400436 /* Undo the runtime PM settings in local_pci_probe() */
Huang Ying967577b2012-11-20 16:08:22 +0800437 pm_runtime_put_sync(dev);
Alan Sternf3ec4f82010-06-08 15:23:51 -0400438
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 /*
Shaohua Li2449e062006-10-20 14:45:32 -0700440 * If the device is still on, set the power state as "unknown",
441 * since it might change by the next time we load the driver.
442 */
443 if (pci_dev->current_state == PCI_D0)
444 pci_dev->current_state = PCI_UNKNOWN;
445
446 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 * We would love to complain here if pci_dev->is_enabled is set, that
448 * the driver should have called pci_disable_device(), but the
449 * unfortunate fact is there are too many odd BIOS and bridge setups
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700450 * that don't like drivers doing that all of the time.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 * Oh well, we can dream of sane hardware when we sleep, no matter how
452 * horrible the crap we have to deal with is when we are awake...
453 */
454
455 pci_dev_put(pci_dev);
456 return 0;
457}
458
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200459static void pci_device_shutdown(struct device *dev)
460{
461 struct pci_dev *pci_dev = to_pci_dev(dev);
462 struct pci_driver *drv = pci_dev->driver;
463
Huang Ying3ff2de92012-10-24 14:54:14 +0800464 pm_runtime_resume(dev);
465
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200466 if (drv && drv->shutdown)
467 drv->shutdown(pci_dev);
468 pci_msi_shutdown(pci_dev);
469 pci_msix_shutdown(pci_dev);
Rafael J. Wysocki5b415f12012-02-07 00:50:35 +0100470
Dave Young2965faa2015-09-09 15:38:55 -0700471#ifdef CONFIG_KEXEC_CORE
Rafael J. Wysocki5b415f12012-02-07 00:50:35 +0100472 /*
Khalid Aziz4fc9bbf2013-11-27 15:19:25 -0700473 * If this is a kexec reboot, turn off Bus Master bit on the
474 * device to tell it to not continue to do DMA. Don't touch
475 * devices in D3cold or unknown states.
476 * If it is not a kexec reboot, firmware will hit the PCI
477 * devices with big hammer and stop their DMA any way.
Khalid Azizb566a222012-04-27 13:00:33 -0600478 */
Khalid Aziz4fc9bbf2013-11-27 15:19:25 -0700479 if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
Konstantin Khlebnikov6e0eda32013-03-14 18:49:37 +0400480 pci_clear_master(pci_dev);
Khalid Aziz4fc9bbf2013-11-27 15:19:25 -0700481#endif
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200482}
483
Rafael J. Wysockiaa338602011-02-11 00:06:54 +0100484#ifdef CONFIG_PM
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100485
486/* Auxiliary functions used for system resume and run-time resume. */
487
488/**
489 * pci_restore_standard_config - restore standard config registers of PCI device
490 * @pci_dev: PCI device to handle
491 */
492static int pci_restore_standard_config(struct pci_dev *pci_dev)
493{
494 pci_update_current_state(pci_dev, PCI_UNKNOWN);
495
496 if (pci_dev->current_state != PCI_D0) {
497 int error = pci_set_power_state(pci_dev, PCI_D0);
498 if (error)
499 return error;
500 }
501
Jon Mason1d3c16a2010-11-30 17:43:26 -0600502 pci_restore_state(pci_dev);
503 return 0;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100504}
505
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100506#endif
507
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200508#ifdef CONFIG_PM_SLEEP
509
Rafael J. Wysockidb288c92012-07-05 15:20:00 -0600510static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
511{
512 pci_power_up(pci_dev);
513 pci_restore_state(pci_dev);
514 pci_fixup_device(pci_fixup_resume_early, pci_dev);
515}
516
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200517/*
518 * Default "suspend" method for devices that have no driver provided suspend,
Rafael J. Wysockifa58d302009-01-07 13:03:42 +0100519 * or not even a driver at all (second part).
520 */
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100521static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200522{
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200523 /*
524 * mark its power state as "unknown", since we don't know if
525 * e.g. the BIOS will change its device state when we suspend.
526 */
527 if (pci_dev->current_state == PCI_D0)
528 pci_dev->current_state = PCI_UNKNOWN;
529}
530
531/*
532 * Default "resume" method for devices that have no driver provided resume,
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100533 * or not even a driver at all (second part).
534 */
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100535static int pci_pm_reenable_device(struct pci_dev *pci_dev)
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100536{
537 int retval;
538
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200539 /* if the device was enabled before suspend, reenable */
540 retval = pci_reenable_device(pci_dev);
541 /*
542 * if the device was busmaster before the suspend, make it busmaster
543 * again
544 */
545 if (pci_dev->is_busmaster)
546 pci_set_master(pci_dev);
547
548 return retval;
549}
550
551static int pci_legacy_suspend(struct device *dev, pm_message_t state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400553 struct pci_dev *pci_dev = to_pci_dev(dev);
554 struct pci_driver *drv = pci_dev->driver;
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100555
Andrew Morton02669492006-03-23 01:38:34 -0800556 if (drv && drv->suspend) {
Rafael J. Wysocki99dadce2009-02-04 01:59:09 +0100557 pci_power_t prev = pci_dev->current_state;
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100558 int error;
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +0100559
Frans Pop57ef8022009-03-16 22:39:56 +0100560 error = drv->suspend(pci_dev, state);
561 suspend_report_result(drv->suspend, error);
562 if (error)
563 return error;
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +0100564
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100565 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
Rafael J. Wysocki99dadce2009-02-04 01:59:09 +0100566 && pci_dev->current_state != PCI_UNKNOWN) {
567 WARN_ONCE(pci_dev->current_state != prev,
568 "PCI PM: Device state not saved by %pF\n",
569 drv->suspend);
Rafael J. Wysocki99dadce2009-02-04 01:59:09 +0100570 }
Andrew Morton02669492006-03-23 01:38:34 -0800571 }
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100572
573 pci_fixup_device(pci_fixup_suspend, pci_dev);
574
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100575 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576}
577
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200578static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
Linus Torvaldscbd69db2006-06-24 14:50:29 -0700579{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400580 struct pci_dev *pci_dev = to_pci_dev(dev);
581 struct pci_driver *drv = pci_dev->driver;
Linus Torvaldscbd69db2006-06-24 14:50:29 -0700582
583 if (drv && drv->suspend_late) {
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100584 pci_power_t prev = pci_dev->current_state;
585 int error;
586
Frans Pop57ef8022009-03-16 22:39:56 +0100587 error = drv->suspend_late(pci_dev, state);
588 suspend_report_result(drv->suspend_late, error);
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100589 if (error)
590 return error;
591
592 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
593 && pci_dev->current_state != PCI_UNKNOWN) {
594 WARN_ONCE(pci_dev->current_state != prev,
595 "PCI PM: Device state not saved by %pF\n",
596 drv->suspend_late);
Andreas Noever7d2a01b2014-06-03 22:04:09 +0200597 goto Fixup;
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100598 }
Linus Torvaldscbd69db2006-06-24 14:50:29 -0700599 }
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100600
601 if (!pci_dev->state_saved)
602 pci_save_state(pci_dev);
603
604 pci_pm_set_unknown_state(pci_dev);
605
Andreas Noever7d2a01b2014-06-03 22:04:09 +0200606Fixup:
607 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
608
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100609 return 0;
Linus Torvaldscbd69db2006-06-24 14:50:29 -0700610}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100612static int pci_legacy_resume_early(struct device *dev)
613{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400614 struct pci_dev *pci_dev = to_pci_dev(dev);
615 struct pci_driver *drv = pci_dev->driver;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100616
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +0100617 return drv && drv->resume_early ?
618 drv->resume_early(pci_dev) : 0;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100619}
620
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200621static int pci_legacy_resume(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622{
Ryan Desfosses3c78bc62014-04-18 20:13:49 -0400623 struct pci_dev *pci_dev = to_pci_dev(dev);
624 struct pci_driver *drv = pci_dev->driver;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100626 pci_fixup_device(pci_fixup_resume, pci_dev);
627
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +0100628 return drv && drv->resume ?
629 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630}
631
Rafael J. Wysocki571ff752009-01-07 13:05:05 +0100632/* Auxiliary functions used by the new power management framework */
633
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100634static void pci_pm_default_resume(struct pci_dev *pci_dev)
Rafael J. Wysocki571ff752009-01-07 13:05:05 +0100635{
Rafael J. Wysocki734104292009-01-07 13:07:15 +0100636 pci_fixup_device(pci_fixup_resume, pci_dev);
637
Yijing Wang326c1cd2014-05-04 12:23:36 +0800638 if (!pci_has_subordinate(pci_dev))
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100639 pci_enable_wake(pci_dev, PCI_D0, false);
Rafael J. Wysocki571ff752009-01-07 13:05:05 +0100640}
641
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100642static void pci_pm_default_suspend(struct pci_dev *pci_dev)
Rafael J. Wysocki734104292009-01-07 13:07:15 +0100643{
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100644 /* Disable non-bridge devices without PM support */
Yijing Wang326c1cd2014-05-04 12:23:36 +0800645 if (!pci_has_subordinate(pci_dev))
Rafael J. Wysockicbbc2f62009-02-04 02:01:15 +0100646 pci_disable_enabled_device(pci_dev);
Rafael J. Wysocki734104292009-01-07 13:07:15 +0100647}
648
Rafael J. Wysocki07e836e2009-01-07 13:06:10 +0100649static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
650{
651 struct pci_driver *drv = pci_dev->driver;
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100652 bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume
Rafael J. Wysocki07e836e2009-01-07 13:06:10 +0100653 || drv->resume_early);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100654
655 /*
656 * Legacy PM support is used by default, so warn if the new framework is
657 * supported as well. Drivers are supposed to support either the
658 * former, or the latter, but not both at the same time.
659 */
David Fries82440a82011-11-20 15:29:46 -0600660 WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n",
661 drv->name, pci_dev->vendor, pci_dev->device);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100662
663 return ret;
Rafael J. Wysocki07e836e2009-01-07 13:06:10 +0100664}
665
Rafael J. Wysocki571ff752009-01-07 13:05:05 +0100666/* New power management framework */
667
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200668static int pci_pm_prepare(struct device *dev)
669{
670 struct device_driver *drv = dev->driver;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200671
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100672 /*
Rafael J. Wysocki7cd06022014-02-26 01:00:30 +0100673 * Devices having power.ignore_children set may still be necessary for
674 * suspending their children in the next phase of device suspend.
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100675 */
Rafael J. Wysocki7cd06022014-02-26 01:00:30 +0100676 if (dev->power.ignore_children)
677 pm_runtime_resume(dev);
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100678
Rafael J. Wysockibac2a902015-01-21 02:17:42 +0100679 if (drv && drv->pm && drv->pm->prepare) {
680 int error = drv->pm->prepare(dev);
681 if (error)
682 return error;
683 }
684 return pci_dev_keep_suspended(to_pci_dev(dev));
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200685}
686
Rafael J. Wysocki2cef5482015-09-30 01:10:24 +0200687static void pci_pm_complete(struct device *dev)
688{
689 struct device_driver *drv = dev->driver;
690 struct pci_dev *pci_dev = to_pci_dev(dev);
691
692 pci_dev_complete_resume(pci_dev);
693
694 if (drv && drv->pm && drv->pm->complete)
695 drv->pm->complete(dev);
696}
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200697
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100698#else /* !CONFIG_PM_SLEEP */
699
700#define pci_pm_prepare NULL
Rafael J. Wysocki2cef5482015-09-30 01:10:24 +0200701#define pci_pm_complete NULL
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100702
703#endif /* !CONFIG_PM_SLEEP */
704
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200705#ifdef CONFIG_SUSPEND
706
707static int pci_pm_suspend(struct device *dev)
708{
709 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700710 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200711
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100712 if (pci_has_legacy_pm_support(pci_dev))
713 return pci_legacy_suspend(dev, PMSG_SUSPEND);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100714
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100715 if (!pm) {
716 pci_pm_default_suspend(pci_dev);
717 goto Fixup;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200718 }
Rafael J. Wysockifa58d302009-01-07 13:03:42 +0100719
Rafael J. Wysocki7cd06022014-02-26 01:00:30 +0100720 /*
721 * PCI devices suspended at run time need to be resumed at this point,
722 * because in general it is necessary to reconfigure them for system
723 * suspend. Namely, if the device is supposed to wake up the system
724 * from the sleep state, we may need to reconfigure it for this purpose.
725 * In turn, if the device is not supposed to wake up the system from the
726 * sleep state, we'll have to prevent it from signaling wake-up.
727 */
728 pm_runtime_resume(dev);
729
Rafael J. Wysocki82fee4d2013-02-04 15:56:05 +0400730 pci_dev->state_saved = false;
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100731 if (pm->suspend) {
732 pci_power_t prev = pci_dev->current_state;
733 int error;
734
735 error = pm->suspend(dev);
736 suspend_report_result(pm->suspend, error);
737 if (error)
738 return error;
739
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100740 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100741 && pci_dev->current_state != PCI_UNKNOWN) {
742 WARN_ONCE(pci_dev->current_state != prev,
743 "PCI PM: State of device not saved by %pF\n",
744 pm->suspend);
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100745 }
746 }
747
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100748 Fixup:
749 pci_fixup_device(pci_fixup_suspend, pci_dev);
750
751 return 0;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200752}
753
754static int pci_pm_suspend_noirq(struct device *dev)
Greg KHc8958172005-04-08 14:53:31 +0900755{
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100756 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700757 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Greg KHc8958172005-04-08 14:53:31 +0900758
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100759 if (pci_has_legacy_pm_support(pci_dev))
760 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
761
Rafael J. Wysocki931ff682009-03-16 22:40:50 +0100762 if (!pm) {
763 pci_save_state(pci_dev);
Andreas Noever7d2a01b2014-06-03 22:04:09 +0200764 goto Fixup;
Rafael J. Wysocki931ff682009-03-16 22:40:50 +0100765 }
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100766
767 if (pm->suspend_noirq) {
768 pci_power_t prev = pci_dev->current_state;
769 int error;
770
771 error = pm->suspend_noirq(dev);
772 suspend_report_result(pm->suspend_noirq, error);
773 if (error)
774 return error;
775
776 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
777 && pci_dev->current_state != PCI_UNKNOWN) {
778 WARN_ONCE(pci_dev->current_state != prev,
779 "PCI PM: State of device not saved by %pF\n",
780 pm->suspend_noirq);
Andreas Noever7d2a01b2014-06-03 22:04:09 +0200781 goto Fixup;
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100782 }
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200783 }
784
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100785 if (!pci_dev->state_saved) {
786 pci_save_state(pci_dev);
Yijing Wang326c1cd2014-05-04 12:23:36 +0800787 if (!pci_has_subordinate(pci_dev))
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100788 pci_prepare_to_sleep(pci_dev);
789 }
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100790
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100791 pci_pm_set_unknown_state(pci_dev);
792
Alan Sterndbf0e4c2012-07-09 11:09:21 -0400793 /*
794 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
795 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
796 * hasn't been quiesced and tries to turn it off. If the controller
797 * is already in D3, this can hang or cause memory corruption.
798 *
799 * Since the value of the COMMAND register doesn't matter once the
800 * device has been suspended, we can safely set it to 0 here.
801 */
802 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
803 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
804
Andreas Noever7d2a01b2014-06-03 22:04:09 +0200805Fixup:
806 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
807
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100808 return 0;
Greg KHc8958172005-04-08 14:53:31 +0900809}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200811static int pci_pm_resume_noirq(struct device *dev)
812{
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100813 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200814 struct device_driver *drv = dev->driver;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200815 int error = 0;
816
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +0100817 pci_pm_default_resume_early(pci_dev);
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +0100818
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100819 if (pci_has_legacy_pm_support(pci_dev))
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100820 return pci_legacy_resume_early(dev);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100821
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100822 if (drv && drv->pm && drv->pm->resume_noirq)
823 error = drv->pm->resume_noirq(dev);
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200824
825 return error;
826}
827
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100828static int pci_pm_resume(struct device *dev)
829{
830 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700831 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100832 int error = 0;
833
Rafael J. Wysocki418e4da2009-01-26 21:43:08 +0100834 /*
835 * This is necessary for the suspend error path in which resume is
836 * called without restoring the standard config registers of the device.
837 */
838 if (pci_dev->state_saved)
839 pci_restore_standard_config(pci_dev);
840
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100841 if (pci_has_legacy_pm_support(pci_dev))
842 return pci_legacy_resume(dev);
843
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100844 pci_pm_default_resume(pci_dev);
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100845
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100846 if (pm) {
847 if (pm->resume)
848 error = pm->resume(dev);
849 } else {
850 pci_pm_reenable_device(pci_dev);
851 }
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100852
Rafael J. Wysocki999cce42009-09-09 23:51:27 +0200853 return error;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100854}
855
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200856#else /* !CONFIG_SUSPEND */
857
858#define pci_pm_suspend NULL
859#define pci_pm_suspend_noirq NULL
860#define pci_pm_resume NULL
861#define pci_pm_resume_noirq NULL
862
863#endif /* !CONFIG_SUSPEND */
864
Rafael J. Wysocki1f112ce2011-04-11 22:54:42 +0200865#ifdef CONFIG_HIBERNATE_CALLBACKS
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200866
Sebastian Ott699c1982013-08-20 16:41:02 +0200867
868/*
869 * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing
870 * a hibernate transition
871 */
872struct dev_pm_ops __weak pcibios_pm_ops;
873
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200874static int pci_pm_freeze(struct device *dev)
875{
876 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700877 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200878
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100879 if (pci_has_legacy_pm_support(pci_dev))
880 return pci_legacy_suspend(dev, PMSG_FREEZE);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100881
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100882 if (!pm) {
883 pci_pm_default_suspend(pci_dev);
884 return 0;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200885 }
886
Rafael J. Wysocki7cd06022014-02-26 01:00:30 +0100887 /*
888 * This used to be done in pci_pm_prepare() for all devices and some
889 * drivers may depend on it, so do it here. Ideally, runtime-suspended
890 * devices should not be touched during freeze/thaw transitions,
891 * however.
892 */
893 pm_runtime_resume(dev);
894
Rafael J. Wysocki82fee4d2013-02-04 15:56:05 +0400895 pci_dev->state_saved = false;
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100896 if (pm->freeze) {
897 int error;
898
899 error = pm->freeze(dev);
900 suspend_report_result(pm->freeze, error);
901 if (error)
902 return error;
903 }
904
Sebastian Ott699c1982013-08-20 16:41:02 +0200905 if (pcibios_pm_ops.freeze)
906 return pcibios_pm_ops.freeze(dev);
907
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100908 return 0;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200909}
910
911static int pci_pm_freeze_noirq(struct device *dev)
912{
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100913 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200914 struct device_driver *drv = dev->driver;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200915
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100916 if (pci_has_legacy_pm_support(pci_dev))
917 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
918
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100919 if (drv && drv->pm && drv->pm->freeze_noirq) {
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100920 int error;
921
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100922 error = drv->pm->freeze_noirq(dev);
923 suspend_report_result(drv->pm->freeze_noirq, error);
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100924 if (error)
925 return error;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200926 }
927
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100928 if (!pci_dev->state_saved)
929 pci_save_state(pci_dev);
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100930
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100931 pci_pm_set_unknown_state(pci_dev);
932
Sebastian Ott699c1982013-08-20 16:41:02 +0200933 if (pcibios_pm_ops.freeze_noirq)
934 return pcibios_pm_ops.freeze_noirq(dev);
935
Rafael J. Wysocki46939f82009-03-16 22:40:26 +0100936 return 0;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200937}
938
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200939static int pci_pm_thaw_noirq(struct device *dev)
940{
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100941 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysockiadf09492008-10-06 22:46:05 +0200942 struct device_driver *drv = dev->driver;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200943 int error = 0;
944
Sebastian Ott699c1982013-08-20 16:41:02 +0200945 if (pcibios_pm_ops.thaw_noirq) {
946 error = pcibios_pm_ops.thaw_noirq(dev);
947 if (error)
948 return error;
949 }
950
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100951 if (pci_has_legacy_pm_support(pci_dev))
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100952 return pci_legacy_resume_early(dev);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100953
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +0100954 pci_update_current_state(pci_dev, PCI_D0);
955
956 if (drv && drv->pm && drv->pm->thaw_noirq)
957 error = drv->pm->thaw_noirq(dev);
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200958
959 return error;
960}
961
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100962static int pci_pm_thaw(struct device *dev)
963{
964 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700965 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100966 int error = 0;
967
Sebastian Ott699c1982013-08-20 16:41:02 +0200968 if (pcibios_pm_ops.thaw) {
969 error = pcibios_pm_ops.thaw(dev);
970 if (error)
971 return error;
972 }
973
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100974 if (pci_has_legacy_pm_support(pci_dev))
975 return pci_legacy_resume(dev);
976
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100977 if (pm) {
978 if (pm->thaw)
979 error = pm->thaw(dev);
980 } else {
981 pci_pm_reenable_device(pci_dev);
982 }
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100983
Rafael J. Wysocki4b77b0a2009-09-09 23:49:59 +0200984 pci_dev->state_saved = false;
985
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +0100986 return error;
987}
988
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200989static int pci_pm_poweroff(struct device *dev)
990{
Rafael J. Wysocki355a72d2008-12-08 00:34:57 +0100991 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -0700992 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +0200993
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +0100994 if (pci_has_legacy_pm_support(pci_dev))
995 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
Rafael J. Wysockibb808942009-01-07 14:15:17 +0100996
Rafael J. Wysocki5294e252009-02-04 02:09:07 +0100997 if (!pm) {
998 pci_pm_default_suspend(pci_dev);
999 goto Fixup;
1000 }
1001
Rafael J. Wysocki7cd06022014-02-26 01:00:30 +01001002 /* The reason to do that is the same as in pci_pm_suspend(). */
1003 pm_runtime_resume(dev);
1004
Rafael J. Wysocki82fee4d2013-02-04 15:56:05 +04001005 pci_dev->state_saved = false;
Rafael J. Wysocki5294e252009-02-04 02:09:07 +01001006 if (pm->poweroff) {
Rafael J. Wysocki46939f82009-03-16 22:40:26 +01001007 int error;
1008
Rafael J. Wysockiddb7c9d2009-02-04 01:56:14 +01001009 error = pm->poweroff(dev);
1010 suspend_report_result(pm->poweroff, error);
Rafael J. Wysocki46939f82009-03-16 22:40:26 +01001011 if (error)
1012 return error;
1013 }
1014
1015 Fixup:
1016 pci_fixup_device(pci_fixup_suspend, pci_dev);
1017
Sebastian Ott699c1982013-08-20 16:41:02 +02001018 if (pcibios_pm_ops.poweroff)
1019 return pcibios_pm_ops.poweroff(dev);
1020
Rafael J. Wysocki46939f82009-03-16 22:40:26 +01001021 return 0;
1022}
1023
1024static int pci_pm_poweroff_noirq(struct device *dev)
1025{
1026 struct pci_dev *pci_dev = to_pci_dev(dev);
1027 struct device_driver *drv = dev->driver;
1028
1029 if (pci_has_legacy_pm_support(to_pci_dev(dev)))
1030 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
1031
Andreas Noever7d2a01b2014-06-03 22:04:09 +02001032 if (!drv || !drv->pm) {
1033 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
Rafael J. Wysocki46939f82009-03-16 22:40:26 +01001034 return 0;
Andreas Noever7d2a01b2014-06-03 22:04:09 +02001035 }
Rafael J. Wysocki46939f82009-03-16 22:40:26 +01001036
1037 if (drv->pm->poweroff_noirq) {
1038 int error;
1039
1040 error = drv->pm->poweroff_noirq(dev);
1041 suspend_report_result(drv->pm->poweroff_noirq, error);
1042 if (error)
1043 return error;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001044 }
1045
Yijing Wang326c1cd2014-05-04 12:23:36 +08001046 if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev))
Rafael J. Wysocki5294e252009-02-04 02:09:07 +01001047 pci_prepare_to_sleep(pci_dev);
1048
Rafael J. Wysocki0b68c8e2012-08-12 23:26:07 +02001049 /*
1050 * The reason for doing this here is the same as for the analogous code
1051 * in pci_pm_suspend_noirq().
1052 */
1053 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
1054 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
1055
Andreas Noever7d2a01b2014-06-03 22:04:09 +02001056 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1057
Sebastian Ott699c1982013-08-20 16:41:02 +02001058 if (pcibios_pm_ops.poweroff_noirq)
1059 return pcibios_pm_ops.poweroff_noirq(dev);
1060
Rafael J. Wysocki46939f82009-03-16 22:40:26 +01001061 return 0;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001062}
1063
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001064static int pci_pm_restore_noirq(struct device *dev)
1065{
1066 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001067 struct device_driver *drv = dev->driver;
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001068 int error = 0;
1069
Sebastian Ott699c1982013-08-20 16:41:02 +02001070 if (pcibios_pm_ops.restore_noirq) {
1071 error = pcibios_pm_ops.restore_noirq(dev);
1072 if (error)
1073 return error;
1074 }
1075
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001076 pci_pm_default_resume_early(pci_dev);
Rafael J. Wysockiaa8c6c92009-01-16 21:54:43 +01001077
Rafael J. Wysockiad8cfa12009-01-07 13:09:37 +01001078 if (pci_has_legacy_pm_support(pci_dev))
Rafael J. Wysockibb808942009-01-07 14:15:17 +01001079 return pci_legacy_resume_early(dev);
Rafael J. Wysockibb808942009-01-07 14:15:17 +01001080
Rafael J. Wysockid67e37d2009-01-07 13:11:28 +01001081 if (drv && drv->pm && drv->pm->restore_noirq)
1082 error = drv->pm->restore_noirq(dev);
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001083
1084 return error;
1085}
1086
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +01001087static int pci_pm_restore(struct device *dev)
1088{
1089 struct pci_dev *pci_dev = to_pci_dev(dev);
Dmitry Torokhov8150f322009-07-24 22:11:32 -07001090 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +01001091 int error = 0;
1092
Sebastian Ott699c1982013-08-20 16:41:02 +02001093 if (pcibios_pm_ops.restore) {
1094 error = pcibios_pm_ops.restore(dev);
1095 if (error)
1096 return error;
1097 }
1098
Rafael J. Wysocki418e4da2009-01-26 21:43:08 +01001099 /*
1100 * This is necessary for the hibernation error path in which restore is
1101 * called without restoring the standard config registers of the device.
1102 */
1103 if (pci_dev->state_saved)
1104 pci_restore_standard_config(pci_dev);
1105
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +01001106 if (pci_has_legacy_pm_support(pci_dev))
1107 return pci_legacy_resume(dev);
1108
Rafael J. Wysocki5294e252009-02-04 02:09:07 +01001109 pci_pm_default_resume(pci_dev);
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +01001110
Rafael J. Wysocki5294e252009-02-04 02:09:07 +01001111 if (pm) {
1112 if (pm->restore)
1113 error = pm->restore(dev);
1114 } else {
1115 pci_pm_reenable_device(pci_dev);
1116 }
Rafael J. Wysockif6dc1e52009-01-07 13:12:22 +01001117
1118 return error;
1119}
1120
Rafael J. Wysocki1f112ce2011-04-11 22:54:42 +02001121#else /* !CONFIG_HIBERNATE_CALLBACKS */
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001122
1123#define pci_pm_freeze NULL
1124#define pci_pm_freeze_noirq NULL
1125#define pci_pm_thaw NULL
1126#define pci_pm_thaw_noirq NULL
1127#define pci_pm_poweroff NULL
1128#define pci_pm_poweroff_noirq NULL
1129#define pci_pm_restore NULL
1130#define pci_pm_restore_noirq NULL
1131
Rafael J. Wysocki1f112ce2011-04-11 22:54:42 +02001132#endif /* !CONFIG_HIBERNATE_CALLBACKS */
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001133
Rafael J. Wysockifbb988b2014-11-27 23:16:57 +01001134#ifdef CONFIG_PM
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001135
1136static int pci_pm_runtime_suspend(struct device *dev)
1137{
1138 struct pci_dev *pci_dev = to_pci_dev(dev);
1139 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1140 pci_power_t prev = pci_dev->current_state;
1141 int error;
1142
Huang Ying967577b2012-11-20 16:08:22 +08001143 /*
1144 * If pci_dev->driver is not set (unbound), the device should
1145 * always remain in D0 regardless of the runtime PM status
1146 */
1147 if (!pci_dev->driver)
1148 return 0;
1149
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001150 if (!pm || !pm->runtime_suspend)
1151 return -ENOSYS;
1152
Rafael J. Wysocki82fee4d2013-02-04 15:56:05 +04001153 pci_dev->state_saved = false;
Huang Ying448bd852012-06-23 10:23:51 +08001154 pci_dev->no_d3cold = false;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001155 error = pm->runtime_suspend(dev);
1156 suspend_report_result(pm->runtime_suspend, error);
1157 if (error)
1158 return error;
Huang Ying448bd852012-06-23 10:23:51 +08001159 if (!pci_dev->d3cold_allowed)
1160 pci_dev->no_d3cold = true;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001161
1162 pci_fixup_device(pci_fixup_suspend, pci_dev);
1163
1164 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
1165 && pci_dev->current_state != PCI_UNKNOWN) {
1166 WARN_ONCE(pci_dev->current_state != prev,
1167 "PCI PM: State of device not saved by %pF\n",
1168 pm->runtime_suspend);
1169 return 0;
1170 }
1171
Dave Airlie42eca232012-10-29 17:26:54 -06001172 if (!pci_dev->state_saved) {
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001173 pci_save_state(pci_dev);
Dave Airlie42eca232012-10-29 17:26:54 -06001174 pci_finish_runtime_suspend(pci_dev);
1175 }
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001176
1177 return 0;
1178}
1179
1180static int pci_pm_runtime_resume(struct device *dev)
1181{
Huang Ying448bd852012-06-23 10:23:51 +08001182 int rc;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001183 struct pci_dev *pci_dev = to_pci_dev(dev);
1184 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1185
Huang Ying967577b2012-11-20 16:08:22 +08001186 /*
1187 * If pci_dev->driver is not set (unbound), the device should
1188 * always remain in D0 regardless of the runtime PM status
1189 */
1190 if (!pci_dev->driver)
1191 return 0;
1192
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001193 if (!pm || !pm->runtime_resume)
1194 return -ENOSYS;
1195
Rafael J. Wysockidb288c92012-07-05 15:20:00 -06001196 pci_restore_standard_config(pci_dev);
1197 pci_fixup_device(pci_fixup_resume_early, pci_dev);
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001198 __pci_enable_wake(pci_dev, PCI_D0, true, false);
1199 pci_fixup_device(pci_fixup_resume, pci_dev);
1200
Huang Ying448bd852012-06-23 10:23:51 +08001201 rc = pm->runtime_resume(dev);
1202
1203 pci_dev->runtime_d3cold = false;
1204
1205 return rc;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001206}
1207
1208static int pci_pm_runtime_idle(struct device *dev)
1209{
Huang Ying967577b2012-11-20 16:08:22 +08001210 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001211 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
Rafael J. Wysocki45f0a852013-06-03 21:49:52 +02001212 int ret = 0;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001213
Huang Ying967577b2012-11-20 16:08:22 +08001214 /*
1215 * If pci_dev->driver is not set (unbound), the device should
1216 * always remain in D0 regardless of the runtime PM status
1217 */
1218 if (!pci_dev->driver)
Rafael J. Wysocki45f0a852013-06-03 21:49:52 +02001219 return 0;
Huang Ying967577b2012-11-20 16:08:22 +08001220
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001221 if (!pm)
1222 return -ENOSYS;
1223
Rafael J. Wysocki45f0a852013-06-03 21:49:52 +02001224 if (pm->runtime_idle)
1225 ret = pm->runtime_idle(dev);
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001226
Rafael J. Wysocki45f0a852013-06-03 21:49:52 +02001227 return ret;
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001228}
1229
Sachin Kamatf91da042013-10-04 12:04:44 -06001230static const struct dev_pm_ops pci_dev_pm_ops = {
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001231 .prepare = pci_pm_prepare,
Rafael J. Wysocki2cef5482015-09-30 01:10:24 +02001232 .complete = pci_pm_complete,
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001233 .suspend = pci_pm_suspend,
1234 .resume = pci_pm_resume,
1235 .freeze = pci_pm_freeze,
1236 .thaw = pci_pm_thaw,
1237 .poweroff = pci_pm_poweroff,
1238 .restore = pci_pm_restore,
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001239 .suspend_noirq = pci_pm_suspend_noirq,
1240 .resume_noirq = pci_pm_resume_noirq,
1241 .freeze_noirq = pci_pm_freeze_noirq,
1242 .thaw_noirq = pci_pm_thaw_noirq,
1243 .poweroff_noirq = pci_pm_poweroff_noirq,
1244 .restore_noirq = pci_pm_restore_noirq,
Rafael J. Wysocki6cbf8212010-02-17 23:44:58 +01001245 .runtime_suspend = pci_pm_runtime_suspend,
1246 .runtime_resume = pci_pm_runtime_resume,
1247 .runtime_idle = pci_pm_runtime_idle,
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001248};
1249
Rafael J. Wysockiadf09492008-10-06 22:46:05 +02001250#define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001251
Rafael J. Wysockifbb988b2014-11-27 23:16:57 +01001252#else /* !CONFIG_PM */
1253
1254#define pci_pm_runtime_suspend NULL
1255#define pci_pm_runtime_resume NULL
1256#define pci_pm_runtime_idle NULL
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001257
1258#define PCI_PM_OPS_PTR NULL
1259
Rafael J. Wysockifbb988b2014-11-27 23:16:57 +01001260#endif /* !CONFIG_PM */
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001261
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262/**
Laurent riffard863b18f2005-10-27 23:12:54 +02001263 * __pci_register_driver - register a new pci driver
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264 * @drv: the driver structure to register
Laurent riffard863b18f2005-10-27 23:12:54 +02001265 * @owner: owner module of drv
Randy Dunlapf95d8822007-02-10 14:41:56 -08001266 * @mod_name: module name string
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001267 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268 * Adds the driver structure to the list of registered drivers.
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001269 * Returns a negative value on error, otherwise 0.
1270 * If no error occurred, the driver remains registered even if
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271 * no device was claimed during registration.
1272 */
Greg Kroah-Hartman725522b2007-01-15 11:50:02 -08001273int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1274 const char *mod_name)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276 /* initialize common driver fields */
1277 drv->driver.name = drv->name;
1278 drv->driver.bus = &pci_bus_type;
Laurent riffard863b18f2005-10-27 23:12:54 +02001279 drv->driver.owner = owner;
Greg Kroah-Hartman725522b2007-01-15 11:50:02 -08001280 drv->driver.mod_name = mod_name;
Alan Cox50b00752006-08-16 17:42:18 +01001281
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001282 spin_lock_init(&drv->dynids.lock);
1283 INIT_LIST_HEAD(&drv->dynids.list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284
1285 /* register with core */
Konstantin Khlebnikovbfb09a82012-08-08 14:47:51 +04001286 return driver_register(&drv->driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -06001288EXPORT_SYMBOL(__pci_register_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289
1290/**
1291 * pci_unregister_driver - unregister a pci driver
1292 * @drv: the driver structure to unregister
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001293 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294 * Deletes the driver structure from the list of registered PCI drivers,
1295 * gives it a chance to clean up by calling its remove() function for
1296 * each device it was responsible for, and marks those devices as
1297 * driverless.
1298 */
1299
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001300void pci_unregister_driver(struct pci_driver *drv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301{
1302 driver_unregister(&drv->driver);
1303 pci_free_dynids(drv);
1304}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -06001305EXPORT_SYMBOL(pci_unregister_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306
1307static struct pci_driver pci_compat_driver = {
1308 .name = "compat"
1309};
1310
1311/**
1312 * pci_dev_driver - get the pci_driver of a device
1313 * @dev: the device to query
1314 *
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001315 * Returns the appropriate pci_driver structure or %NULL if there is no
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 * registered driver for the device.
1317 */
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001318struct pci_driver *pci_dev_driver(const struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319{
1320 if (dev->driver)
1321 return dev->driver;
1322 else {
1323 int i;
Ryan Desfosses3c78bc62014-04-18 20:13:49 -04001324 for (i = 0; i <= PCI_ROM_RESOURCE; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 if (dev->resource[i].flags & IORESOURCE_BUSY)
1326 return &pci_compat_driver;
1327 }
1328 return NULL;
1329}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -06001330EXPORT_SYMBOL(pci_dev_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331
1332/**
1333 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334 * @dev: the PCI device structure to match against
Randy Dunlap8f7020d2005-10-23 11:57:38 -07001335 * @drv: the device driver to search for matching PCI device id structures
Bjorn Helgaasf7625982013-11-14 11:28:18 -07001336 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 * Used by a driver to check whether a PCI device present in the
Randy Dunlap8f7020d2005-10-23 11:57:38 -07001338 * system is in its list of supported devices. Returns the matching
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339 * pci_device_id structure or %NULL if there is no match.
1340 */
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001341static int pci_bus_match(struct device *dev, struct device_driver *drv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342{
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001343 struct pci_dev *pci_dev = to_pci_dev(dev);
Yinghai Lu58d9a382013-01-21 13:20:51 -08001344 struct pci_driver *pci_drv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 const struct pci_device_id *found_id;
1346
Yinghai Lu58d9a382013-01-21 13:20:51 -08001347 if (!pci_dev->match_driver)
1348 return 0;
1349
1350 pci_drv = to_pci_driver(drv);
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001351 found_id = pci_match_device(pci_drv, pci_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352 if (found_id)
1353 return 1;
1354
Greg Kroah-Hartman75865852005-06-30 02:18:12 -07001355 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356}
1357
1358/**
1359 * pci_dev_get - increments the reference count of the pci device structure
1360 * @dev: the device being referenced
1361 *
1362 * Each live reference to a device should be refcounted.
1363 *
1364 * Drivers for PCI devices should normally record such references in
1365 * their probe() methods, when they bind to a device, and release
1366 * them by calling pci_dev_put(), in their disconnect() methods.
1367 *
1368 * A pointer to the device with the incremented reference counter is returned.
1369 */
1370struct pci_dev *pci_dev_get(struct pci_dev *dev)
1371{
1372 if (dev)
1373 get_device(&dev->dev);
1374 return dev;
1375}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -06001376EXPORT_SYMBOL(pci_dev_get);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377
1378/**
1379 * pci_dev_put - release a use of the pci device structure
1380 * @dev: device that's been disconnected
1381 *
1382 * Must be called when a user of a device is finished with it. When the last
1383 * user of the device calls this function, the memory of the device is freed.
1384 */
1385void pci_dev_put(struct pci_dev *dev)
1386{
1387 if (dev)
1388 put_device(&dev->dev);
1389}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -06001390EXPORT_SYMBOL(pci_dev_put);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391
Bill Pemberton8ccc9aa2012-11-21 15:34:58 -05001392static int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1393{
1394 struct pci_dev *pdev;
1395
1396 if (!dev)
1397 return -ENODEV;
1398
1399 pdev = to_pci_dev(dev);
Bill Pemberton8ccc9aa2012-11-21 15:34:58 -05001400
1401 if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
1402 return -ENOMEM;
1403
1404 if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
1405 return -ENOMEM;
1406
1407 if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
1408 pdev->subsystem_device))
1409 return -ENOMEM;
1410
1411 if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
1412 return -ENOMEM;
1413
Ricardo Ribalda Delgado145b3fe2014-12-02 17:35:04 +01001414 if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X",
Bill Pemberton8ccc9aa2012-11-21 15:34:58 -05001415 pdev->vendor, pdev->device,
1416 pdev->subsystem_vendor, pdev->subsystem_device,
1417 (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
1418 (u8)(pdev->class)))
1419 return -ENOMEM;
Bjorn Helgaasefdd4072014-04-05 15:08:22 -06001420
Bill Pemberton8ccc9aa2012-11-21 15:34:58 -05001421 return 0;
1422}
1423
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424struct bus_type pci_bus_type = {
1425 .name = "pci",
1426 .match = pci_bus_match,
Kay Sievers312c0042005-11-16 09:00:00 +01001427 .uevent = pci_uevent,
Russell Kingb15d6862006-01-05 14:30:22 +00001428 .probe = pci_device_probe,
1429 .remove = pci_device_remove,
Linus Torvaldscbd69db2006-06-24 14:50:29 -07001430 .shutdown = pci_device_shutdown,
Greg Kroah-Hartman5136b2d2013-10-06 23:55:40 -07001431 .dev_groups = pci_dev_groups,
Greg Kroah-Hartman0f49ba52013-10-07 14:51:02 -06001432 .bus_groups = pci_bus_groups,
Greg Kroah-Hartman2229c1f2013-10-07 14:51:20 -06001433 .drv_groups = pci_drv_groups,
Rafael J. Wysockibbb44d92008-05-20 00:49:04 +02001434 .pm = PCI_PM_OPS_PTR,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001435};
Ryan Desfossesb7fe9432014-04-25 14:32:25 -06001436EXPORT_SYMBOL(pci_bus_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437
1438static int __init pci_driver_init(void)
1439{
1440 return bus_register(&pci_bus_type);
1441}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442postcore_initcall(pci_driver_init);