Commit | Line | Data |
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7328c8f4 | 1 | // SPDX-License-Identifier: GPL-2.0 |
f46753c5 | 2 | /* |
f46753c5 | 3 | * Copyright (C) 2006 Matthew Wilcox <matthew@wil.cx> |
62795041 AC |
4 | * Copyright (C) 2006-2009 Hewlett-Packard Development Company, L.P. |
5 | * Alex Chiang <achiang@hp.com> | |
f46753c5 AC |
6 | */ |
7 | ||
8 | #include <linux/kobject.h> | |
5a0e3ad6 | 9 | #include <linux/slab.h> |
eefa9cfc | 10 | #include <linux/module.h> |
f46753c5 AC |
11 | #include <linux/pci.h> |
12 | #include <linux/err.h> | |
13 | #include "pci.h" | |
14 | ||
15 | struct kset *pci_slots_kset; | |
16 | EXPORT_SYMBOL_GPL(pci_slots_kset); | |
17 | ||
18 | static 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 | ||
26 | static 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 | ||
52cf25d0 | 34 | static const struct sysfs_ops pci_slot_sysfs_ops = { |
f46753c5 AC |
35 | .show = pci_slot_attr_show, |
36 | .store = pci_slot_attr_store, | |
37 | }; | |
38 | ||
39 | static ssize_t address_read_file(struct pci_slot *slot, char *buf) | |
40 | { | |
41 | if (slot->number == 0xff) | |
f8cf6e51 KW |
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); | |
f46753c5 AC |
50 | } |
51 | ||
3749c51a MW |
52 | static ssize_t bus_speed_read(enum pci_bus_speed speed, char *buf) |
53 | { | |
f8cf6e51 | 54 | return sysfs_emit(buf, "%s\n", pci_speed_string(speed)); |
3749c51a MW |
55 | } |
56 | ||
57 | static 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 | ||
62 | static 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 | ||
f46753c5 AC |
67 | static void pci_slot_release(struct kobject *kobj) |
68 | { | |
cef354db | 69 | struct pci_dev *dev; |
f46753c5 AC |
70 | struct pci_slot *slot = to_pci_slot(kobj); |
71 | ||
62795041 AC |
72 | dev_dbg(&slot->bus->dev, "dev %02x, released physical slot %s\n", |
73 | slot->number, pci_slot_name(slot)); | |
f46753c5 | 74 | |
67546762 | 75 | down_read(&pci_bus_sem); |
cef354db AC |
76 | list_for_each_entry(dev, &slot->bus->devices, bus_list) |
77 | if (PCI_SLOT(dev->devfn) == slot->number) | |
78 | dev->slot = NULL; | |
67546762 | 79 | up_read(&pci_bus_sem); |
cef354db | 80 | |
f46753c5 AC |
81 | list_del(&slot->list); |
82 | ||
83 | kfree(slot); | |
84 | } | |
85 | ||
86 | static struct pci_slot_attribute pci_slot_attr_address = | |
58f86cc8 | 87 | __ATTR(address, S_IRUGO, address_read_file, NULL); |
3749c51a | 88 | static struct pci_slot_attribute pci_slot_attr_max_speed = |
58f86cc8 | 89 | __ATTR(max_bus_speed, S_IRUGO, max_speed_read_file, NULL); |
3749c51a | 90 | static struct pci_slot_attribute pci_slot_attr_cur_speed = |
58f86cc8 | 91 | __ATTR(cur_bus_speed, S_IRUGO, cur_speed_read_file, NULL); |
f46753c5 AC |
92 | |
93 | static struct attribute *pci_slot_default_attrs[] = { | |
94 | &pci_slot_attr_address.attr, | |
3749c51a MW |
95 | &pci_slot_attr_max_speed.attr, |
96 | &pci_slot_attr_cur_speed.attr, | |
f46753c5 AC |
97 | NULL, |
98 | }; | |
0cf948aa | 99 | ATTRIBUTE_GROUPS(pci_slot_default); |
f46753c5 | 100 | |
10473777 | 101 | static const struct kobj_type pci_slot_ktype = { |
f46753c5 AC |
102 | .sysfs_ops = &pci_slot_sysfs_ops, |
103 | .release = &pci_slot_release, | |
0cf948aa | 104 | .default_groups = pci_slot_default_groups, |
f46753c5 AC |
105 | }; |
106 | ||
5fe6cc60 AC |
107 | static 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 | ||
145 | static int rename_slot(struct pci_slot *slot, const char *name) | |
146 | { | |
147 | int result = 0; | |
148 | char *slot_name; | |
149 | ||
0ad772ec | 150 | if (strcmp(pci_slot_name(slot), name) == 0) |
5fe6cc60 AC |
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 | ||
017ffe64 YW |
163 | void 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 | ||
5fe6cc60 AC |
174 | static struct pci_slot *get_slot(struct pci_bus *parent, int slot_nr) |
175 | { | |
176 | struct pci_slot *slot; | |
67546762 YW |
177 | |
178 | /* We already hold pci_slot_mutex */ | |
5fe6cc60 AC |
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 | ||
f46753c5 AC |
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> | |
828f3768 | 193 | * @hotplug: set if caller is hotplug driver, NULL otherwise |
f46753c5 AC |
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 | * | |
5fe6cc60 AC |
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. | |
f46753c5 AC |
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 == | |
5fe6cc60 AC |
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 | |
f46753c5 AC |
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 | */ | |
f46753c5 | 226 | struct pci_slot *pci_create_slot(struct pci_bus *parent, int slot_nr, |
828f3768 AC |
227 | const char *name, |
228 | struct hotplug_slot *hotplug) | |
f46753c5 | 229 | { |
cef354db | 230 | struct pci_dev *dev; |
f46753c5 | 231 | struct pci_slot *slot; |
5fe6cc60 AC |
232 | int err = 0; |
233 | char *slot_name = NULL; | |
f46753c5 | 234 | |
67546762 | 235 | mutex_lock(&pci_slot_mutex); |
f46753c5 AC |
236 | |
237 | if (slot_nr == -1) | |
238 | goto placeholder; | |
239 | ||
5fe6cc60 AC |
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 | } | |
f46753c5 | 253 | } |
5fe6cc60 | 254 | goto out; |
f46753c5 AC |
255 | } |
256 | ||
257 | placeholder: | |
258 | slot = kzalloc(sizeof(*slot), GFP_KERNEL); | |
259 | if (!slot) { | |
5fe6cc60 AC |
260 | err = -ENOMEM; |
261 | goto err; | |
f46753c5 AC |
262 | } |
263 | ||
264 | slot->bus = parent; | |
265 | slot->number = slot_nr; | |
266 | ||
267 | slot->kobj.kset = pci_slots_kset; | |
5fe6cc60 AC |
268 | |
269 | slot_name = make_slot_name(name); | |
270 | if (!slot_name) { | |
271 | err = -ENOMEM; | |
8a94644b | 272 | kfree(slot); |
f46753c5 AC |
273 | goto err; |
274 | } | |
275 | ||
4684709b JZ |
276 | INIT_LIST_HEAD(&slot->list); |
277 | list_add(&slot->list, &parent->slots); | |
278 | ||
5fe6cc60 AC |
279 | err = kobject_init_and_add(&slot->kobj, &pci_slot_ktype, NULL, |
280 | "%s", slot_name); | |
8a94644b QW |
281 | if (err) { |
282 | kobject_put(&slot->kobj); | |
5fe6cc60 | 283 | goto err; |
8a94644b | 284 | } |
5fe6cc60 | 285 | |
67546762 | 286 | down_read(&pci_bus_sem); |
cef354db AC |
287 | list_for_each_entry(dev, &parent->devices, bus_list) |
288 | if (PCI_SLOT(dev->devfn) == slot_nr) | |
289 | dev->slot = slot; | |
67546762 | 290 | up_read(&pci_bus_sem); |
cef354db | 291 | |
62795041 AC |
292 | dev_dbg(&parent->dev, "dev %02x, created physical slot %s\n", |
293 | slot_nr, pci_slot_name(slot)); | |
f46753c5 | 294 | |
5fe6cc60 | 295 | out: |
3b5dd45e | 296 | kfree(slot_name); |
67546762 | 297 | mutex_unlock(&pci_slot_mutex); |
f46753c5 | 298 | return slot; |
5fe6cc60 | 299 | err: |
f46753c5 AC |
300 | slot = ERR_PTR(err); |
301 | goto out; | |
302 | } | |
303 | EXPORT_SYMBOL_GPL(pci_create_slot); | |
304 | ||
f46753c5 AC |
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 | */ | |
f46753c5 AC |
313 | void pci_destroy_slot(struct pci_slot *slot) |
314 | { | |
62795041 | 315 | dev_dbg(&slot->bus->dev, "dev %02x, dec refcount to %d\n", |
2c935bc5 | 316 | slot->number, kref_read(&slot->kobj.kref) - 1); |
f46753c5 | 317 | |
67546762 | 318 | mutex_lock(&pci_slot_mutex); |
f46753c5 | 319 | kobject_put(&slot->kobj); |
67546762 | 320 | mutex_unlock(&pci_slot_mutex); |
f46753c5 AC |
321 | } |
322 | EXPORT_SYMBOL_GPL(pci_destroy_slot); | |
323 | ||
c825bc94 KK |
324 | #if defined(CONFIG_HOTPLUG_PCI) || defined(CONFIG_HOTPLUG_PCI_MODULE) |
325 | #include <linux/pci_hotplug.h> | |
326 | /** | |
2f0cd59c | 327 | * pci_hp_create_module_link - create symbolic link to hotplug driver module |
503998ca | 328 | * @pci_slot: struct pci_slot |
c825bc94 KK |
329 | * |
330 | * Helper function for pci_hotplug_core.c to create symbolic link to | |
331 | * the hotplug driver module. | |
332 | */ | |
333 | void pci_hp_create_module_link(struct pci_slot *pci_slot) | |
334 | { | |
335 | struct hotplug_slot *slot = pci_slot->hotplug; | |
336 | struct kobject *kobj = NULL; | |
9fc9eea0 | 337 | int ret; |
c825bc94 KK |
338 | |
339 | if (!slot || !slot->ops) | |
340 | return; | |
81c4b5bf | 341 | kobj = kset_find_obj(module_kset, slot->mod_name); |
c825bc94 KK |
342 | if (!kobj) |
343 | return; | |
9fc9eea0 BH |
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); | |
c825bc94 KK |
348 | kobject_put(kobj); |
349 | } | |
350 | EXPORT_SYMBOL_GPL(pci_hp_create_module_link); | |
351 | ||
352 | /** | |
2f0cd59c MCC |
353 | * pci_hp_remove_module_link - remove symbolic link to the hotplug driver |
354 | * module. | |
503998ca | 355 | * @pci_slot: struct pci_slot |
c825bc94 KK |
356 | * |
357 | * Helper function for pci_hotplug_core.c to remove symbolic link to | |
358 | * the hotplug driver module. | |
359 | */ | |
360 | void pci_hp_remove_module_link(struct pci_slot *pci_slot) | |
361 | { | |
362 | sysfs_remove_link(&pci_slot->kobj, "module"); | |
363 | } | |
364 | EXPORT_SYMBOL_GPL(pci_hp_remove_module_link); | |
365 | #endif | |
366 | ||
f46753c5 AC |
367 | static 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) { | |
25da8dba | 375 | pr_err("PCI: Slot initialization failure\n"); |
f46753c5 AC |
376 | return -ENOMEM; |
377 | } | |
378 | return 0; | |
379 | } | |
380 | ||
381 | subsys_initcall(pci_slot_init); |