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1/*
2 * drivers/pci/slot.c
3 * Copyright (C) 2006 Matthew Wilcox <matthew@wil.cx>
4 * Copyright (C) 2006-2009 Hewlett-Packard Development Company, L.P.
5 * Alex Chiang <achiang@hp.com>
6 */
7
8#include <linux/kobject.h>
9#include <linux/slab.h>
10#include <linux/pci.h>
11#include <linux/err.h>
12#include "pci.h"
13
14struct kset *pci_slots_kset;
15EXPORT_SYMBOL_GPL(pci_slots_kset);
16
17static ssize_t pci_slot_attr_show(struct kobject *kobj,
18 struct attribute *attr, char *buf)
19{
20 struct pci_slot *slot = to_pci_slot(kobj);
21 struct pci_slot_attribute *attribute = to_pci_slot_attr(attr);
22 return attribute->show ? attribute->show(slot, buf) : -EIO;
23}
24
25static ssize_t pci_slot_attr_store(struct kobject *kobj,
26 struct attribute *attr, const char *buf, size_t len)
27{
28 struct pci_slot *slot = to_pci_slot(kobj);
29 struct pci_slot_attribute *attribute = to_pci_slot_attr(attr);
30 return attribute->store ? attribute->store(slot, buf, len) : -EIO;
31}
32
33static const struct sysfs_ops pci_slot_sysfs_ops = {
34 .show = pci_slot_attr_show,
35 .store = pci_slot_attr_store,
36};
37
38static ssize_t address_read_file(struct pci_slot *slot, char *buf)
39{
40 if (slot->number == 0xff)
41 return sprintf(buf, "%04x:%02x\n",
42 pci_domain_nr(slot->bus),
43 slot->bus->number);
44 else
45 return sprintf(buf, "%04x:%02x:%02x\n",
46 pci_domain_nr(slot->bus),
47 slot->bus->number,
48 slot->number);
49}
50
51/* these strings match up with the values in pci_bus_speed */
52static const char *pci_bus_speed_strings[] = {
53 "33 MHz PCI", /* 0x00 */
54 "66 MHz PCI", /* 0x01 */
55 "66 MHz PCI-X", /* 0x02 */
56 "100 MHz PCI-X", /* 0x03 */
57 "133 MHz PCI-X", /* 0x04 */
58 NULL, /* 0x05 */
59 NULL, /* 0x06 */
60 NULL, /* 0x07 */
61 NULL, /* 0x08 */
62 "66 MHz PCI-X 266", /* 0x09 */
63 "100 MHz PCI-X 266", /* 0x0a */
64 "133 MHz PCI-X 266", /* 0x0b */
65 "Unknown AGP", /* 0x0c */
66 "1x AGP", /* 0x0d */
67 "2x AGP", /* 0x0e */
68 "4x AGP", /* 0x0f */
69 "8x AGP", /* 0x10 */
70 "66 MHz PCI-X 533", /* 0x11 */
71 "100 MHz PCI-X 533", /* 0x12 */
72 "133 MHz PCI-X 533", /* 0x13 */
73 "2.5 GT/s PCIe", /* 0x14 */
74 "5.0 GT/s PCIe", /* 0x15 */
75 "8.0 GT/s PCIe", /* 0x16 */
76};
77
78static ssize_t bus_speed_read(enum pci_bus_speed speed, char *buf)
79{
80 const char *speed_string;
81
82 if (speed < ARRAY_SIZE(pci_bus_speed_strings))
83 speed_string = pci_bus_speed_strings[speed];
84 else
85 speed_string = "Unknown";
86
87 return sprintf(buf, "%s\n", speed_string);
88}
89
90static ssize_t max_speed_read_file(struct pci_slot *slot, char *buf)
91{
92 return bus_speed_read(slot->bus->max_bus_speed, buf);
93}
94
95static ssize_t cur_speed_read_file(struct pci_slot *slot, char *buf)
96{
97 return bus_speed_read(slot->bus->cur_bus_speed, buf);
98}
99
100static void pci_slot_release(struct kobject *kobj)
101{
102 struct pci_dev *dev;
103 struct pci_slot *slot = to_pci_slot(kobj);
104
105 dev_dbg(&slot->bus->dev, "dev %02x, released physical slot %s\n",
106 slot->number, pci_slot_name(slot));
107
108 list_for_each_entry(dev, &slot->bus->devices, bus_list)
109 if (PCI_SLOT(dev->devfn) == slot->number)
110 dev->slot = NULL;
111
112 list_del(&slot->list);
113
114 kfree(slot);
115}
116
117static struct pci_slot_attribute pci_slot_attr_address =
118 __ATTR(address, (S_IFREG | S_IRUGO), address_read_file, NULL);
119static struct pci_slot_attribute pci_slot_attr_max_speed =
120 __ATTR(max_bus_speed, (S_IFREG | S_IRUGO), max_speed_read_file, NULL);
121static struct pci_slot_attribute pci_slot_attr_cur_speed =
122 __ATTR(cur_bus_speed, (S_IFREG | S_IRUGO), cur_speed_read_file, NULL);
123
124static struct attribute *pci_slot_default_attrs[] = {
125 &pci_slot_attr_address.attr,
126 &pci_slot_attr_max_speed.attr,
127 &pci_slot_attr_cur_speed.attr,
128 NULL,
129};
130
131static struct kobj_type pci_slot_ktype = {
132 .sysfs_ops = &pci_slot_sysfs_ops,
133 .release = &pci_slot_release,
134 .default_attrs = pci_slot_default_attrs,
135};
136
137static char *make_slot_name(const char *name)
138{
139 char *new_name;
140 int len, max, dup;
141
142 new_name = kstrdup(name, GFP_KERNEL);
143 if (!new_name)
144 return NULL;
145
146 /*
147 * Make sure we hit the realloc case the first time through the
148 * loop. 'len' will be strlen(name) + 3 at that point which is
149 * enough space for "name-X" and the trailing NUL.
150 */
151 len = strlen(name) + 2;
152 max = 1;
153 dup = 1;
154
155 for (;;) {
156 struct kobject *dup_slot;
157 dup_slot = kset_find_obj(pci_slots_kset, new_name);
158 if (!dup_slot)
159 break;
160 kobject_put(dup_slot);
161 if (dup == max) {
162 len++;
163 max *= 10;
164 kfree(new_name);
165 new_name = kmalloc(len, GFP_KERNEL);
166 if (!new_name)
167 break;
168 }
169 sprintf(new_name, "%s-%d", name, dup++);
170 }
171
172 return new_name;
173}
174
175static int rename_slot(struct pci_slot *slot, const char *name)
176{
177 int result = 0;
178 char *slot_name;
179
180 if (strcmp(pci_slot_name(slot), name) == 0)
181 return result;
182
183 slot_name = make_slot_name(name);
184 if (!slot_name)
185 return -ENOMEM;
186
187 result = kobject_rename(&slot->kobj, slot_name);
188 kfree(slot_name);
189
190 return result;
191}
192
193static struct pci_slot *get_slot(struct pci_bus *parent, int slot_nr)
194{
195 struct pci_slot *slot;
196 /*
197 * We already hold pci_bus_sem so don't worry
198 */
199 list_for_each_entry(slot, &parent->slots, list)
200 if (slot->number == slot_nr) {
201 kobject_get(&slot->kobj);
202 return slot;
203 }
204
205 return NULL;
206}
207
208/**
209 * pci_create_slot - create or increment refcount for physical PCI slot
210 * @parent: struct pci_bus of parent bridge
211 * @slot_nr: PCI_SLOT(pci_dev->devfn) or -1 for placeholder
212 * @name: user visible string presented in /sys/bus/pci/slots/<name>
213 * @hotplug: set if caller is hotplug driver, NULL otherwise
214 *
215 * PCI slots have first class attributes such as address, speed, width,
216 * and a &struct pci_slot is used to manage them. This interface will
217 * either return a new &struct pci_slot to the caller, or if the pci_slot
218 * already exists, its refcount will be incremented.
219 *
220 * Slots are uniquely identified by a @pci_bus, @slot_nr tuple.
221 *
222 * There are known platforms with broken firmware that assign the same
223 * name to multiple slots. Workaround these broken platforms by renaming
224 * the slots on behalf of the caller. If firmware assigns name N to
225 * multiple slots:
226 *
227 * The first slot is assigned N
228 * The second slot is assigned N-1
229 * The third slot is assigned N-2
230 * etc.
231 *
232 * Placeholder slots:
233 * In most cases, @pci_bus, @slot_nr will be sufficient to uniquely identify
234 * a slot. There is one notable exception - pSeries (rpaphp), where the
235 * @slot_nr cannot be determined until a device is actually inserted into
236 * the slot. In this scenario, the caller may pass -1 for @slot_nr.
237 *
238 * The following semantics are imposed when the caller passes @slot_nr ==
239 * -1. First, we no longer check for an existing %struct pci_slot, as there
240 * may be many slots with @slot_nr of -1. The other change in semantics is
241 * user-visible, which is the 'address' parameter presented in sysfs will
242 * consist solely of a dddd:bb tuple, where dddd is the PCI domain of the
243 * %struct pci_bus and bb is the bus number. In other words, the devfn of
244 * the 'placeholder' slot will not be displayed.
245 */
246struct pci_slot *pci_create_slot(struct pci_bus *parent, int slot_nr,
247 const char *name,
248 struct hotplug_slot *hotplug)
249{
250 struct pci_dev *dev;
251 struct pci_slot *slot;
252 int err = 0;
253 char *slot_name = NULL;
254
255 down_write(&pci_bus_sem);
256
257 if (slot_nr == -1)
258 goto placeholder;
259
260 /*
261 * Hotplug drivers are allowed to rename an existing slot,
262 * but only if not already claimed.
263 */
264 slot = get_slot(parent, slot_nr);
265 if (slot) {
266 if (hotplug) {
267 if ((err = slot->hotplug ? -EBUSY : 0)
268 || (err = rename_slot(slot, name))) {
269 kobject_put(&slot->kobj);
270 slot = NULL;
271 goto err;
272 }
273 }
274 goto out;
275 }
276
277placeholder:
278 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
279 if (!slot) {
280 err = -ENOMEM;
281 goto err;
282 }
283
284 slot->bus = parent;
285 slot->number = slot_nr;
286
287 slot->kobj.kset = pci_slots_kset;
288
289 slot_name = make_slot_name(name);
290 if (!slot_name) {
291 err = -ENOMEM;
292 goto err;
293 }
294
295 err = kobject_init_and_add(&slot->kobj, &pci_slot_ktype, NULL,
296 "%s", slot_name);
297 if (err)
298 goto err;
299
300 INIT_LIST_HEAD(&slot->list);
301 list_add(&slot->list, &parent->slots);
302
303 list_for_each_entry(dev, &parent->devices, bus_list)
304 if (PCI_SLOT(dev->devfn) == slot_nr)
305 dev->slot = slot;
306
307 dev_dbg(&parent->dev, "dev %02x, created physical slot %s\n",
308 slot_nr, pci_slot_name(slot));
309
310out:
311 kfree(slot_name);
312 up_write(&pci_bus_sem);
313 return slot;
314err:
315 kfree(slot);
316 slot = ERR_PTR(err);
317 goto out;
318}
319EXPORT_SYMBOL_GPL(pci_create_slot);
320
321/**
322 * pci_renumber_slot - update %struct pci_slot -> number
323 * @slot: &struct pci_slot to update
324 * @slot_nr: new number for slot
325 *
326 * The primary purpose of this interface is to allow callers who earlier
327 * created a placeholder slot in pci_create_slot() by passing a -1 as
328 * slot_nr, to update their %struct pci_slot with the correct @slot_nr.
329 */
330void pci_renumber_slot(struct pci_slot *slot, int slot_nr)
331{
332 struct pci_slot *tmp;
333
334 down_write(&pci_bus_sem);
335
336 list_for_each_entry(tmp, &slot->bus->slots, list) {
337 WARN_ON(tmp->number == slot_nr);
338 goto out;
339 }
340
341 slot->number = slot_nr;
342out:
343 up_write(&pci_bus_sem);
344}
345EXPORT_SYMBOL_GPL(pci_renumber_slot);
346
347/**
348 * pci_destroy_slot - decrement refcount for physical PCI slot
349 * @slot: struct pci_slot to decrement
350 *
351 * %struct pci_slot is refcounted, so destroying them is really easy; we
352 * just call kobject_put on its kobj and let our release methods do the
353 * rest.
354 */
355void pci_destroy_slot(struct pci_slot *slot)
356{
357 dev_dbg(&slot->bus->dev, "dev %02x, dec refcount to %d\n",
358 slot->number, atomic_read(&slot->kobj.kref.refcount) - 1);
359
360 down_write(&pci_bus_sem);
361 kobject_put(&slot->kobj);
362 up_write(&pci_bus_sem);
363}
364EXPORT_SYMBOL_GPL(pci_destroy_slot);
365
366#if defined(CONFIG_HOTPLUG_PCI) || defined(CONFIG_HOTPLUG_PCI_MODULE)
367#include <linux/pci_hotplug.h>
368/**
369 * pci_hp_create_link - create symbolic link to the hotplug driver module.
370 * @pci_slot: struct pci_slot
371 *
372 * Helper function for pci_hotplug_core.c to create symbolic link to
373 * the hotplug driver module.
374 */
375void pci_hp_create_module_link(struct pci_slot *pci_slot)
376{
377 struct hotplug_slot *slot = pci_slot->hotplug;
378 struct kobject *kobj = NULL;
379 int no_warn;
380
381 if (!slot || !slot->ops)
382 return;
383 kobj = kset_find_obj(module_kset, slot->ops->mod_name);
384 if (!kobj)
385 return;
386 no_warn = sysfs_create_link(&pci_slot->kobj, kobj, "module");
387 kobject_put(kobj);
388}
389EXPORT_SYMBOL_GPL(pci_hp_create_module_link);
390
391/**
392 * pci_hp_remove_link - remove symbolic link to the hotplug driver module.
393 * @pci_slot: struct pci_slot
394 *
395 * Helper function for pci_hotplug_core.c to remove symbolic link to
396 * the hotplug driver module.
397 */
398void pci_hp_remove_module_link(struct pci_slot *pci_slot)
399{
400 sysfs_remove_link(&pci_slot->kobj, "module");
401}
402EXPORT_SYMBOL_GPL(pci_hp_remove_module_link);
403#endif
404
405static int pci_slot_init(void)
406{
407 struct kset *pci_bus_kset;
408
409 pci_bus_kset = bus_get_kset(&pci_bus_type);
410 pci_slots_kset = kset_create_and_add("slots", NULL,
411 &pci_bus_kset->kobj);
412 if (!pci_slots_kset) {
413 printk(KERN_ERR "PCI: Slot initialization failure\n");
414 return -ENOMEM;
415 }
416 return 0;
417}
418
419subsys_initcall(pci_slot_init);
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2006 Matthew Wilcox <matthew@wil.cx>
4 * Copyright (C) 2006-2009 Hewlett-Packard Development Company, L.P.
5 * Alex Chiang <achiang@hp.com>
6 */
7
8#include <linux/kobject.h>
9#include <linux/slab.h>
10#include <linux/module.h>
11#include <linux/pci.h>
12#include <linux/err.h>
13#include "pci.h"
14
15struct kset *pci_slots_kset;
16EXPORT_SYMBOL_GPL(pci_slots_kset);
17
18static ssize_t pci_slot_attr_show(struct kobject *kobj,
19 struct attribute *attr, char *buf)
20{
21 struct pci_slot *slot = to_pci_slot(kobj);
22 struct pci_slot_attribute *attribute = to_pci_slot_attr(attr);
23 return attribute->show ? attribute->show(slot, buf) : -EIO;
24}
25
26static ssize_t pci_slot_attr_store(struct kobject *kobj,
27 struct attribute *attr, const char *buf, size_t len)
28{
29 struct pci_slot *slot = to_pci_slot(kobj);
30 struct pci_slot_attribute *attribute = to_pci_slot_attr(attr);
31 return attribute->store ? attribute->store(slot, buf, len) : -EIO;
32}
33
34static const struct sysfs_ops pci_slot_sysfs_ops = {
35 .show = pci_slot_attr_show,
36 .store = pci_slot_attr_store,
37};
38
39static ssize_t address_read_file(struct pci_slot *slot, char *buf)
40{
41 if (slot->number == 0xff)
42 return sysfs_emit(buf, "%04x:%02x\n",
43 pci_domain_nr(slot->bus),
44 slot->bus->number);
45
46 return sysfs_emit(buf, "%04x:%02x:%02x\n",
47 pci_domain_nr(slot->bus),
48 slot->bus->number,
49 slot->number);
50}
51
52static ssize_t bus_speed_read(enum pci_bus_speed speed, char *buf)
53{
54 return sysfs_emit(buf, "%s\n", pci_speed_string(speed));
55}
56
57static ssize_t max_speed_read_file(struct pci_slot *slot, char *buf)
58{
59 return bus_speed_read(slot->bus->max_bus_speed, buf);
60}
61
62static ssize_t cur_speed_read_file(struct pci_slot *slot, char *buf)
63{
64 return bus_speed_read(slot->bus->cur_bus_speed, buf);
65}
66
67static void pci_slot_release(struct kobject *kobj)
68{
69 struct pci_dev *dev;
70 struct pci_slot *slot = to_pci_slot(kobj);
71
72 dev_dbg(&slot->bus->dev, "dev %02x, released physical slot %s\n",
73 slot->number, pci_slot_name(slot));
74
75 down_read(&pci_bus_sem);
76 list_for_each_entry(dev, &slot->bus->devices, bus_list)
77 if (PCI_SLOT(dev->devfn) == slot->number)
78 dev->slot = NULL;
79 up_read(&pci_bus_sem);
80
81 list_del(&slot->list);
82
83 kfree(slot);
84}
85
86static struct pci_slot_attribute pci_slot_attr_address =
87 __ATTR(address, S_IRUGO, address_read_file, NULL);
88static struct pci_slot_attribute pci_slot_attr_max_speed =
89 __ATTR(max_bus_speed, S_IRUGO, max_speed_read_file, NULL);
90static struct pci_slot_attribute pci_slot_attr_cur_speed =
91 __ATTR(cur_bus_speed, S_IRUGO, cur_speed_read_file, NULL);
92
93static struct attribute *pci_slot_default_attrs[] = {
94 &pci_slot_attr_address.attr,
95 &pci_slot_attr_max_speed.attr,
96 &pci_slot_attr_cur_speed.attr,
97 NULL,
98};
99ATTRIBUTE_GROUPS(pci_slot_default);
100
101static struct kobj_type pci_slot_ktype = {
102 .sysfs_ops = &pci_slot_sysfs_ops,
103 .release = &pci_slot_release,
104 .default_groups = pci_slot_default_groups,
105};
106
107static char *make_slot_name(const char *name)
108{
109 char *new_name;
110 int len, max, dup;
111
112 new_name = kstrdup(name, GFP_KERNEL);
113 if (!new_name)
114 return NULL;
115
116 /*
117 * Make sure we hit the realloc case the first time through the
118 * loop. 'len' will be strlen(name) + 3 at that point which is
119 * enough space for "name-X" and the trailing NUL.
120 */
121 len = strlen(name) + 2;
122 max = 1;
123 dup = 1;
124
125 for (;;) {
126 struct kobject *dup_slot;
127 dup_slot = kset_find_obj(pci_slots_kset, new_name);
128 if (!dup_slot)
129 break;
130 kobject_put(dup_slot);
131 if (dup == max) {
132 len++;
133 max *= 10;
134 kfree(new_name);
135 new_name = kmalloc(len, GFP_KERNEL);
136 if (!new_name)
137 break;
138 }
139 sprintf(new_name, "%s-%d", name, dup++);
140 }
141
142 return new_name;
143}
144
145static int rename_slot(struct pci_slot *slot, const char *name)
146{
147 int result = 0;
148 char *slot_name;
149
150 if (strcmp(pci_slot_name(slot), name) == 0)
151 return result;
152
153 slot_name = make_slot_name(name);
154 if (!slot_name)
155 return -ENOMEM;
156
157 result = kobject_rename(&slot->kobj, slot_name);
158 kfree(slot_name);
159
160 return result;
161}
162
163void pci_dev_assign_slot(struct pci_dev *dev)
164{
165 struct pci_slot *slot;
166
167 mutex_lock(&pci_slot_mutex);
168 list_for_each_entry(slot, &dev->bus->slots, list)
169 if (PCI_SLOT(dev->devfn) == slot->number)
170 dev->slot = slot;
171 mutex_unlock(&pci_slot_mutex);
172}
173
174static struct pci_slot *get_slot(struct pci_bus *parent, int slot_nr)
175{
176 struct pci_slot *slot;
177
178 /* We already hold pci_slot_mutex */
179 list_for_each_entry(slot, &parent->slots, list)
180 if (slot->number == slot_nr) {
181 kobject_get(&slot->kobj);
182 return slot;
183 }
184
185 return NULL;
186}
187
188/**
189 * pci_create_slot - create or increment refcount for physical PCI slot
190 * @parent: struct pci_bus of parent bridge
191 * @slot_nr: PCI_SLOT(pci_dev->devfn) or -1 for placeholder
192 * @name: user visible string presented in /sys/bus/pci/slots/<name>
193 * @hotplug: set if caller is hotplug driver, NULL otherwise
194 *
195 * PCI slots have first class attributes such as address, speed, width,
196 * and a &struct pci_slot is used to manage them. This interface will
197 * either return a new &struct pci_slot to the caller, or if the pci_slot
198 * already exists, its refcount will be incremented.
199 *
200 * Slots are uniquely identified by a @pci_bus, @slot_nr tuple.
201 *
202 * There are known platforms with broken firmware that assign the same
203 * name to multiple slots. Workaround these broken platforms by renaming
204 * the slots on behalf of the caller. If firmware assigns name N to
205 * multiple slots:
206 *
207 * The first slot is assigned N
208 * The second slot is assigned N-1
209 * The third slot is assigned N-2
210 * etc.
211 *
212 * Placeholder slots:
213 * In most cases, @pci_bus, @slot_nr will be sufficient to uniquely identify
214 * a slot. There is one notable exception - pSeries (rpaphp), where the
215 * @slot_nr cannot be determined until a device is actually inserted into
216 * the slot. In this scenario, the caller may pass -1 for @slot_nr.
217 *
218 * The following semantics are imposed when the caller passes @slot_nr ==
219 * -1. First, we no longer check for an existing %struct pci_slot, as there
220 * may be many slots with @slot_nr of -1. The other change in semantics is
221 * user-visible, which is the 'address' parameter presented in sysfs will
222 * consist solely of a dddd:bb tuple, where dddd is the PCI domain of the
223 * %struct pci_bus and bb is the bus number. In other words, the devfn of
224 * the 'placeholder' slot will not be displayed.
225 */
226struct pci_slot *pci_create_slot(struct pci_bus *parent, int slot_nr,
227 const char *name,
228 struct hotplug_slot *hotplug)
229{
230 struct pci_dev *dev;
231 struct pci_slot *slot;
232 int err = 0;
233 char *slot_name = NULL;
234
235 mutex_lock(&pci_slot_mutex);
236
237 if (slot_nr == -1)
238 goto placeholder;
239
240 /*
241 * Hotplug drivers are allowed to rename an existing slot,
242 * but only if not already claimed.
243 */
244 slot = get_slot(parent, slot_nr);
245 if (slot) {
246 if (hotplug) {
247 if ((err = slot->hotplug ? -EBUSY : 0)
248 || (err = rename_slot(slot, name))) {
249 kobject_put(&slot->kobj);
250 slot = NULL;
251 goto err;
252 }
253 }
254 goto out;
255 }
256
257placeholder:
258 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
259 if (!slot) {
260 err = -ENOMEM;
261 goto err;
262 }
263
264 slot->bus = parent;
265 slot->number = slot_nr;
266
267 slot->kobj.kset = pci_slots_kset;
268
269 slot_name = make_slot_name(name);
270 if (!slot_name) {
271 err = -ENOMEM;
272 kfree(slot);
273 goto err;
274 }
275
276 INIT_LIST_HEAD(&slot->list);
277 list_add(&slot->list, &parent->slots);
278
279 err = kobject_init_and_add(&slot->kobj, &pci_slot_ktype, NULL,
280 "%s", slot_name);
281 if (err) {
282 kobject_put(&slot->kobj);
283 goto err;
284 }
285
286 down_read(&pci_bus_sem);
287 list_for_each_entry(dev, &parent->devices, bus_list)
288 if (PCI_SLOT(dev->devfn) == slot_nr)
289 dev->slot = slot;
290 up_read(&pci_bus_sem);
291
292 dev_dbg(&parent->dev, "dev %02x, created physical slot %s\n",
293 slot_nr, pci_slot_name(slot));
294
295out:
296 kfree(slot_name);
297 mutex_unlock(&pci_slot_mutex);
298 return slot;
299err:
300 slot = ERR_PTR(err);
301 goto out;
302}
303EXPORT_SYMBOL_GPL(pci_create_slot);
304
305/**
306 * pci_destroy_slot - decrement refcount for physical PCI slot
307 * @slot: struct pci_slot to decrement
308 *
309 * %struct pci_slot is refcounted, so destroying them is really easy; we
310 * just call kobject_put on its kobj and let our release methods do the
311 * rest.
312 */
313void pci_destroy_slot(struct pci_slot *slot)
314{
315 dev_dbg(&slot->bus->dev, "dev %02x, dec refcount to %d\n",
316 slot->number, kref_read(&slot->kobj.kref) - 1);
317
318 mutex_lock(&pci_slot_mutex);
319 kobject_put(&slot->kobj);
320 mutex_unlock(&pci_slot_mutex);
321}
322EXPORT_SYMBOL_GPL(pci_destroy_slot);
323
324#if defined(CONFIG_HOTPLUG_PCI) || defined(CONFIG_HOTPLUG_PCI_MODULE)
325#include <linux/pci_hotplug.h>
326/**
327 * pci_hp_create_module_link - create symbolic link to hotplug driver module
328 * @pci_slot: struct pci_slot
329 *
330 * Helper function for pci_hotplug_core.c to create symbolic link to
331 * the hotplug driver module.
332 */
333void pci_hp_create_module_link(struct pci_slot *pci_slot)
334{
335 struct hotplug_slot *slot = pci_slot->hotplug;
336 struct kobject *kobj = NULL;
337 int ret;
338
339 if (!slot || !slot->ops)
340 return;
341 kobj = kset_find_obj(module_kset, slot->mod_name);
342 if (!kobj)
343 return;
344 ret = sysfs_create_link(&pci_slot->kobj, kobj, "module");
345 if (ret)
346 dev_err(&pci_slot->bus->dev, "Error creating sysfs link (%d)\n",
347 ret);
348 kobject_put(kobj);
349}
350EXPORT_SYMBOL_GPL(pci_hp_create_module_link);
351
352/**
353 * pci_hp_remove_module_link - remove symbolic link to the hotplug driver
354 * module.
355 * @pci_slot: struct pci_slot
356 *
357 * Helper function for pci_hotplug_core.c to remove symbolic link to
358 * the hotplug driver module.
359 */
360void pci_hp_remove_module_link(struct pci_slot *pci_slot)
361{
362 sysfs_remove_link(&pci_slot->kobj, "module");
363}
364EXPORT_SYMBOL_GPL(pci_hp_remove_module_link);
365#endif
366
367static int pci_slot_init(void)
368{
369 struct kset *pci_bus_kset;
370
371 pci_bus_kset = bus_get_kset(&pci_bus_type);
372 pci_slots_kset = kset_create_and_add("slots", NULL,
373 &pci_bus_kset->kobj);
374 if (!pci_slots_kset) {
375 pr_err("PCI: Slot initialization failure\n");
376 return -ENOMEM;
377 }
378 return 0;
379}
380
381subsys_initcall(pci_slot_init);