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f46753c5 AC |
1 | /* |
2 | * drivers/pci/slot.c | |
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> |
f46753c5 AC |
10 | #include <linux/pci.h> |
11 | #include <linux/err.h> | |
12 | #include "pci.h" | |
13 | ||
14 | struct kset *pci_slots_kset; | |
15 | EXPORT_SYMBOL_GPL(pci_slots_kset); | |
16 | ||
17 | static 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 | ||
25 | static 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 | ||
52cf25d0 | 33 | static const struct sysfs_ops pci_slot_sysfs_ops = { |
f46753c5 AC |
34 | .show = pci_slot_attr_show, |
35 | .store = pci_slot_attr_store, | |
36 | }; | |
37 | ||
38 | static 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 | ||
3749c51a | 51 | /* these strings match up with the values in pci_bus_speed */ |
17134d96 | 52 | static const char *pci_bus_speed_strings[] = { |
3749c51a MW |
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 */ | |
45b4cdd5 MW |
65 | "Unknown AGP", /* 0x0c */ |
66 | "1x AGP", /* 0x0d */ | |
67 | "2x AGP", /* 0x0e */ | |
68 | "4x AGP", /* 0x0f */ | |
69 | "8x AGP", /* 0x10 */ | |
3749c51a MW |
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 */ | |
9dfd97fe | 75 | "8.0 GT/s PCIe", /* 0x16 */ |
3749c51a MW |
76 | }; |
77 | ||
78 | static 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 | ||
90 | static 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 | ||
95 | static 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 | ||
f46753c5 AC |
100 | static void pci_slot_release(struct kobject *kobj) |
101 | { | |
cef354db | 102 | struct pci_dev *dev; |
f46753c5 AC |
103 | struct pci_slot *slot = to_pci_slot(kobj); |
104 | ||
62795041 AC |
105 | dev_dbg(&slot->bus->dev, "dev %02x, released physical slot %s\n", |
106 | slot->number, pci_slot_name(slot)); | |
f46753c5 | 107 | |
cef354db AC |
108 | list_for_each_entry(dev, &slot->bus->devices, bus_list) |
109 | if (PCI_SLOT(dev->devfn) == slot->number) | |
110 | dev->slot = NULL; | |
111 | ||
f46753c5 AC |
112 | list_del(&slot->list); |
113 | ||
114 | kfree(slot); | |
115 | } | |
116 | ||
117 | static struct pci_slot_attribute pci_slot_attr_address = | |
118 | __ATTR(address, (S_IFREG | S_IRUGO), address_read_file, NULL); | |
3749c51a MW |
119 | static struct pci_slot_attribute pci_slot_attr_max_speed = |
120 | __ATTR(max_bus_speed, (S_IFREG | S_IRUGO), max_speed_read_file, NULL); | |
121 | static struct pci_slot_attribute pci_slot_attr_cur_speed = | |
122 | __ATTR(cur_bus_speed, (S_IFREG | S_IRUGO), cur_speed_read_file, NULL); | |
f46753c5 AC |
123 | |
124 | static struct attribute *pci_slot_default_attrs[] = { | |
125 | &pci_slot_attr_address.attr, | |
3749c51a MW |
126 | &pci_slot_attr_max_speed.attr, |
127 | &pci_slot_attr_cur_speed.attr, | |
f46753c5 AC |
128 | NULL, |
129 | }; | |
130 | ||
131 | static 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 | ||
5fe6cc60 AC |
137 | static 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 | ||
175 | static int rename_slot(struct pci_slot *slot, const char *name) | |
176 | { | |
177 | int result = 0; | |
178 | char *slot_name; | |
179 | ||
0ad772ec | 180 | if (strcmp(pci_slot_name(slot), name) == 0) |
5fe6cc60 AC |
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 | ||
193 | static 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 | ||
f46753c5 AC |
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> | |
828f3768 | 213 | * @hotplug: set if caller is hotplug driver, NULL otherwise |
f46753c5 AC |
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 | * | |
5fe6cc60 AC |
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. | |
f46753c5 AC |
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 == | |
5fe6cc60 AC |
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 | |
f46753c5 AC |
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 | */ | |
f46753c5 | 246 | struct pci_slot *pci_create_slot(struct pci_bus *parent, int slot_nr, |
828f3768 AC |
247 | const char *name, |
248 | struct hotplug_slot *hotplug) | |
f46753c5 | 249 | { |
cef354db | 250 | struct pci_dev *dev; |
f46753c5 | 251 | struct pci_slot *slot; |
5fe6cc60 AC |
252 | int err = 0; |
253 | char *slot_name = NULL; | |
f46753c5 AC |
254 | |
255 | down_write(&pci_bus_sem); | |
256 | ||
257 | if (slot_nr == -1) | |
258 | goto placeholder; | |
259 | ||
5fe6cc60 AC |
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 | } | |
f46753c5 | 273 | } |
5fe6cc60 | 274 | goto out; |
f46753c5 AC |
275 | } |
276 | ||
277 | placeholder: | |
278 | slot = kzalloc(sizeof(*slot), GFP_KERNEL); | |
279 | if (!slot) { | |
5fe6cc60 AC |
280 | err = -ENOMEM; |
281 | goto err; | |
f46753c5 AC |
282 | } |
283 | ||
284 | slot->bus = parent; | |
285 | slot->number = slot_nr; | |
286 | ||
287 | slot->kobj.kset = pci_slots_kset; | |
5fe6cc60 AC |
288 | |
289 | slot_name = make_slot_name(name); | |
290 | if (!slot_name) { | |
291 | err = -ENOMEM; | |
f46753c5 AC |
292 | goto err; |
293 | } | |
294 | ||
5fe6cc60 AC |
295 | err = kobject_init_and_add(&slot->kobj, &pci_slot_ktype, NULL, |
296 | "%s", slot_name); | |
297 | if (err) | |
298 | goto err; | |
299 | ||
f46753c5 AC |
300 | INIT_LIST_HEAD(&slot->list); |
301 | list_add(&slot->list, &parent->slots); | |
302 | ||
cef354db AC |
303 | list_for_each_entry(dev, &parent->devices, bus_list) |
304 | if (PCI_SLOT(dev->devfn) == slot_nr) | |
305 | dev->slot = slot; | |
306 | ||
62795041 AC |
307 | dev_dbg(&parent->dev, "dev %02x, created physical slot %s\n", |
308 | slot_nr, pci_slot_name(slot)); | |
f46753c5 | 309 | |
5fe6cc60 | 310 | out: |
3b5dd45e | 311 | kfree(slot_name); |
f46753c5 AC |
312 | up_write(&pci_bus_sem); |
313 | return slot; | |
5fe6cc60 | 314 | err: |
f46753c5 AC |
315 | kfree(slot); |
316 | slot = ERR_PTR(err); | |
317 | goto out; | |
318 | } | |
319 | EXPORT_SYMBOL_GPL(pci_create_slot); | |
320 | ||
321 | /** | |
d25b7c8d | 322 | * pci_renumber_slot - update %struct pci_slot -> number |
cffb2faf RD |
323 | * @slot: &struct pci_slot to update |
324 | * @slot_nr: new number for slot | |
f46753c5 AC |
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 | */ | |
d25b7c8d | 330 | void pci_renumber_slot(struct pci_slot *slot, int slot_nr) |
f46753c5 | 331 | { |
f46753c5 AC |
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); | |
d25b7c8d | 338 | goto out; |
f46753c5 AC |
339 | } |
340 | ||
f46753c5 | 341 | slot->number = slot_nr; |
d25b7c8d | 342 | out: |
f46753c5 AC |
343 | up_write(&pci_bus_sem); |
344 | } | |
d25b7c8d | 345 | EXPORT_SYMBOL_GPL(pci_renumber_slot); |
f46753c5 AC |
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 | */ | |
f46753c5 AC |
355 | void pci_destroy_slot(struct pci_slot *slot) |
356 | { | |
62795041 AC |
357 | dev_dbg(&slot->bus->dev, "dev %02x, dec refcount to %d\n", |
358 | slot->number, atomic_read(&slot->kobj.kref.refcount) - 1); | |
f46753c5 AC |
359 | |
360 | down_write(&pci_bus_sem); | |
361 | kobject_put(&slot->kobj); | |
362 | up_write(&pci_bus_sem); | |
363 | } | |
364 | EXPORT_SYMBOL_GPL(pci_destroy_slot); | |
365 | ||
c825bc94 KK |
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. | |
503998ca | 370 | * @pci_slot: struct pci_slot |
c825bc94 KK |
371 | * |
372 | * Helper function for pci_hotplug_core.c to create symbolic link to | |
373 | * the hotplug driver module. | |
374 | */ | |
375 | void 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 | } | |
389 | EXPORT_SYMBOL_GPL(pci_hp_create_module_link); | |
390 | ||
391 | /** | |
392 | * pci_hp_remove_link - remove symbolic link to the hotplug driver module. | |
503998ca | 393 | * @pci_slot: struct pci_slot |
c825bc94 KK |
394 | * |
395 | * Helper function for pci_hotplug_core.c to remove symbolic link to | |
396 | * the hotplug driver module. | |
397 | */ | |
398 | void pci_hp_remove_module_link(struct pci_slot *pci_slot) | |
399 | { | |
400 | sysfs_remove_link(&pci_slot->kobj, "module"); | |
401 | } | |
402 | EXPORT_SYMBOL_GPL(pci_hp_remove_module_link); | |
403 | #endif | |
404 | ||
f46753c5 AC |
405 | static 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 | ||
419 | subsys_initcall(pci_slot_init); |