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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> | |
9 | #include <linux/pci.h> | |
10 | #include <linux/err.h> | |
11 | #include "pci.h" | |
12 | ||
13 | struct kset *pci_slots_kset; | |
14 | EXPORT_SYMBOL_GPL(pci_slots_kset); | |
15 | ||
16 | static ssize_t pci_slot_attr_show(struct kobject *kobj, | |
17 | struct attribute *attr, char *buf) | |
18 | { | |
19 | struct pci_slot *slot = to_pci_slot(kobj); | |
20 | struct pci_slot_attribute *attribute = to_pci_slot_attr(attr); | |
21 | return attribute->show ? attribute->show(slot, buf) : -EIO; | |
22 | } | |
23 | ||
24 | static ssize_t pci_slot_attr_store(struct kobject *kobj, | |
25 | struct attribute *attr, const char *buf, size_t len) | |
26 | { | |
27 | struct pci_slot *slot = to_pci_slot(kobj); | |
28 | struct pci_slot_attribute *attribute = to_pci_slot_attr(attr); | |
29 | return attribute->store ? attribute->store(slot, buf, len) : -EIO; | |
30 | } | |
31 | ||
32 | static struct sysfs_ops pci_slot_sysfs_ops = { | |
33 | .show = pci_slot_attr_show, | |
34 | .store = pci_slot_attr_store, | |
35 | }; | |
36 | ||
37 | static ssize_t address_read_file(struct pci_slot *slot, char *buf) | |
38 | { | |
39 | if (slot->number == 0xff) | |
40 | return sprintf(buf, "%04x:%02x\n", | |
41 | pci_domain_nr(slot->bus), | |
42 | slot->bus->number); | |
43 | else | |
44 | return sprintf(buf, "%04x:%02x:%02x\n", | |
45 | pci_domain_nr(slot->bus), | |
46 | slot->bus->number, | |
47 | slot->number); | |
48 | } | |
49 | ||
3749c51a MW |
50 | /* these strings match up with the values in pci_bus_speed */ |
51 | static char *pci_bus_speed_strings[] = { | |
52 | "33 MHz PCI", /* 0x00 */ | |
53 | "66 MHz PCI", /* 0x01 */ | |
54 | "66 MHz PCI-X", /* 0x02 */ | |
55 | "100 MHz PCI-X", /* 0x03 */ | |
56 | "133 MHz PCI-X", /* 0x04 */ | |
57 | NULL, /* 0x05 */ | |
58 | NULL, /* 0x06 */ | |
59 | NULL, /* 0x07 */ | |
60 | NULL, /* 0x08 */ | |
61 | "66 MHz PCI-X 266", /* 0x09 */ | |
62 | "100 MHz PCI-X 266", /* 0x0a */ | |
63 | "133 MHz PCI-X 266", /* 0x0b */ | |
64 | NULL, /* 0x0c */ | |
65 | NULL, /* 0x0d */ | |
66 | NULL, /* 0x0e */ | |
67 | NULL, /* 0x0f */ | |
68 | NULL, /* 0x10 */ | |
69 | "66 MHz PCI-X 533", /* 0x11 */ | |
70 | "100 MHz PCI-X 533", /* 0x12 */ | |
71 | "133 MHz PCI-X 533", /* 0x13 */ | |
72 | "2.5 GT/s PCIe", /* 0x14 */ | |
73 | "5.0 GT/s PCIe", /* 0x15 */ | |
74 | }; | |
75 | ||
76 | static ssize_t bus_speed_read(enum pci_bus_speed speed, char *buf) | |
77 | { | |
78 | const char *speed_string; | |
79 | ||
80 | if (speed < ARRAY_SIZE(pci_bus_speed_strings)) | |
81 | speed_string = pci_bus_speed_strings[speed]; | |
82 | else | |
83 | speed_string = "Unknown"; | |
84 | ||
85 | return sprintf(buf, "%s\n", speed_string); | |
86 | } | |
87 | ||
88 | static ssize_t max_speed_read_file(struct pci_slot *slot, char *buf) | |
89 | { | |
90 | return bus_speed_read(slot->bus->max_bus_speed, buf); | |
91 | } | |
92 | ||
93 | static ssize_t cur_speed_read_file(struct pci_slot *slot, char *buf) | |
94 | { | |
95 | return bus_speed_read(slot->bus->cur_bus_speed, buf); | |
96 | } | |
97 | ||
f46753c5 AC |
98 | static void pci_slot_release(struct kobject *kobj) |
99 | { | |
cef354db | 100 | struct pci_dev *dev; |
f46753c5 AC |
101 | struct pci_slot *slot = to_pci_slot(kobj); |
102 | ||
62795041 AC |
103 | dev_dbg(&slot->bus->dev, "dev %02x, released physical slot %s\n", |
104 | slot->number, pci_slot_name(slot)); | |
f46753c5 | 105 | |
cef354db AC |
106 | list_for_each_entry(dev, &slot->bus->devices, bus_list) |
107 | if (PCI_SLOT(dev->devfn) == slot->number) | |
108 | dev->slot = NULL; | |
109 | ||
f46753c5 AC |
110 | list_del(&slot->list); |
111 | ||
112 | kfree(slot); | |
113 | } | |
114 | ||
115 | static struct pci_slot_attribute pci_slot_attr_address = | |
116 | __ATTR(address, (S_IFREG | S_IRUGO), address_read_file, NULL); | |
3749c51a MW |
117 | static struct pci_slot_attribute pci_slot_attr_max_speed = |
118 | __ATTR(max_bus_speed, (S_IFREG | S_IRUGO), max_speed_read_file, NULL); | |
119 | static struct pci_slot_attribute pci_slot_attr_cur_speed = | |
120 | __ATTR(cur_bus_speed, (S_IFREG | S_IRUGO), cur_speed_read_file, NULL); | |
f46753c5 AC |
121 | |
122 | static struct attribute *pci_slot_default_attrs[] = { | |
123 | &pci_slot_attr_address.attr, | |
3749c51a MW |
124 | &pci_slot_attr_max_speed.attr, |
125 | &pci_slot_attr_cur_speed.attr, | |
f46753c5 AC |
126 | NULL, |
127 | }; | |
128 | ||
129 | static struct kobj_type pci_slot_ktype = { | |
130 | .sysfs_ops = &pci_slot_sysfs_ops, | |
131 | .release = &pci_slot_release, | |
132 | .default_attrs = pci_slot_default_attrs, | |
133 | }; | |
134 | ||
5fe6cc60 AC |
135 | static char *make_slot_name(const char *name) |
136 | { | |
137 | char *new_name; | |
138 | int len, max, dup; | |
139 | ||
140 | new_name = kstrdup(name, GFP_KERNEL); | |
141 | if (!new_name) | |
142 | return NULL; | |
143 | ||
144 | /* | |
145 | * Make sure we hit the realloc case the first time through the | |
146 | * loop. 'len' will be strlen(name) + 3 at that point which is | |
147 | * enough space for "name-X" and the trailing NUL. | |
148 | */ | |
149 | len = strlen(name) + 2; | |
150 | max = 1; | |
151 | dup = 1; | |
152 | ||
153 | for (;;) { | |
154 | struct kobject *dup_slot; | |
155 | dup_slot = kset_find_obj(pci_slots_kset, new_name); | |
156 | if (!dup_slot) | |
157 | break; | |
158 | kobject_put(dup_slot); | |
159 | if (dup == max) { | |
160 | len++; | |
161 | max *= 10; | |
162 | kfree(new_name); | |
163 | new_name = kmalloc(len, GFP_KERNEL); | |
164 | if (!new_name) | |
165 | break; | |
166 | } | |
167 | sprintf(new_name, "%s-%d", name, dup++); | |
168 | } | |
169 | ||
170 | return new_name; | |
171 | } | |
172 | ||
173 | static int rename_slot(struct pci_slot *slot, const char *name) | |
174 | { | |
175 | int result = 0; | |
176 | char *slot_name; | |
177 | ||
0ad772ec | 178 | if (strcmp(pci_slot_name(slot), name) == 0) |
5fe6cc60 AC |
179 | return result; |
180 | ||
181 | slot_name = make_slot_name(name); | |
182 | if (!slot_name) | |
183 | return -ENOMEM; | |
184 | ||
185 | result = kobject_rename(&slot->kobj, slot_name); | |
186 | kfree(slot_name); | |
187 | ||
188 | return result; | |
189 | } | |
190 | ||
191 | static struct pci_slot *get_slot(struct pci_bus *parent, int slot_nr) | |
192 | { | |
193 | struct pci_slot *slot; | |
194 | /* | |
195 | * We already hold pci_bus_sem so don't worry | |
196 | */ | |
197 | list_for_each_entry(slot, &parent->slots, list) | |
198 | if (slot->number == slot_nr) { | |
199 | kobject_get(&slot->kobj); | |
200 | return slot; | |
201 | } | |
202 | ||
203 | return NULL; | |
204 | } | |
205 | ||
f46753c5 AC |
206 | /** |
207 | * pci_create_slot - create or increment refcount for physical PCI slot | |
208 | * @parent: struct pci_bus of parent bridge | |
209 | * @slot_nr: PCI_SLOT(pci_dev->devfn) or -1 for placeholder | |
210 | * @name: user visible string presented in /sys/bus/pci/slots/<name> | |
828f3768 | 211 | * @hotplug: set if caller is hotplug driver, NULL otherwise |
f46753c5 AC |
212 | * |
213 | * PCI slots have first class attributes such as address, speed, width, | |
214 | * and a &struct pci_slot is used to manage them. This interface will | |
215 | * either return a new &struct pci_slot to the caller, or if the pci_slot | |
216 | * already exists, its refcount will be incremented. | |
217 | * | |
5fe6cc60 AC |
218 | * Slots are uniquely identified by a @pci_bus, @slot_nr tuple. |
219 | * | |
220 | * There are known platforms with broken firmware that assign the same | |
221 | * name to multiple slots. Workaround these broken platforms by renaming | |
222 | * the slots on behalf of the caller. If firmware assigns name N to | |
223 | * multiple slots: | |
224 | * | |
225 | * The first slot is assigned N | |
226 | * The second slot is assigned N-1 | |
227 | * The third slot is assigned N-2 | |
228 | * etc. | |
f46753c5 AC |
229 | * |
230 | * Placeholder slots: | |
231 | * In most cases, @pci_bus, @slot_nr will be sufficient to uniquely identify | |
232 | * a slot. There is one notable exception - pSeries (rpaphp), where the | |
233 | * @slot_nr cannot be determined until a device is actually inserted into | |
234 | * the slot. In this scenario, the caller may pass -1 for @slot_nr. | |
235 | * | |
236 | * The following semantics are imposed when the caller passes @slot_nr == | |
5fe6cc60 AC |
237 | * -1. First, we no longer check for an existing %struct pci_slot, as there |
238 | * may be many slots with @slot_nr of -1. The other change in semantics is | |
f46753c5 AC |
239 | * user-visible, which is the 'address' parameter presented in sysfs will |
240 | * consist solely of a dddd:bb tuple, where dddd is the PCI domain of the | |
241 | * %struct pci_bus and bb is the bus number. In other words, the devfn of | |
242 | * the 'placeholder' slot will not be displayed. | |
243 | */ | |
f46753c5 | 244 | struct pci_slot *pci_create_slot(struct pci_bus *parent, int slot_nr, |
828f3768 AC |
245 | const char *name, |
246 | struct hotplug_slot *hotplug) | |
f46753c5 | 247 | { |
cef354db | 248 | struct pci_dev *dev; |
f46753c5 | 249 | struct pci_slot *slot; |
5fe6cc60 AC |
250 | int err = 0; |
251 | char *slot_name = NULL; | |
f46753c5 AC |
252 | |
253 | down_write(&pci_bus_sem); | |
254 | ||
255 | if (slot_nr == -1) | |
256 | goto placeholder; | |
257 | ||
5fe6cc60 AC |
258 | /* |
259 | * Hotplug drivers are allowed to rename an existing slot, | |
260 | * but only if not already claimed. | |
261 | */ | |
262 | slot = get_slot(parent, slot_nr); | |
263 | if (slot) { | |
264 | if (hotplug) { | |
265 | if ((err = slot->hotplug ? -EBUSY : 0) | |
266 | || (err = rename_slot(slot, name))) { | |
267 | kobject_put(&slot->kobj); | |
268 | slot = NULL; | |
269 | goto err; | |
270 | } | |
f46753c5 | 271 | } |
5fe6cc60 | 272 | goto out; |
f46753c5 AC |
273 | } |
274 | ||
275 | placeholder: | |
276 | slot = kzalloc(sizeof(*slot), GFP_KERNEL); | |
277 | if (!slot) { | |
5fe6cc60 AC |
278 | err = -ENOMEM; |
279 | goto err; | |
f46753c5 AC |
280 | } |
281 | ||
282 | slot->bus = parent; | |
283 | slot->number = slot_nr; | |
284 | ||
285 | slot->kobj.kset = pci_slots_kset; | |
5fe6cc60 AC |
286 | |
287 | slot_name = make_slot_name(name); | |
288 | if (!slot_name) { | |
289 | err = -ENOMEM; | |
f46753c5 AC |
290 | goto err; |
291 | } | |
292 | ||
5fe6cc60 AC |
293 | err = kobject_init_and_add(&slot->kobj, &pci_slot_ktype, NULL, |
294 | "%s", slot_name); | |
295 | if (err) | |
296 | goto err; | |
297 | ||
f46753c5 AC |
298 | INIT_LIST_HEAD(&slot->list); |
299 | list_add(&slot->list, &parent->slots); | |
300 | ||
cef354db AC |
301 | list_for_each_entry(dev, &parent->devices, bus_list) |
302 | if (PCI_SLOT(dev->devfn) == slot_nr) | |
303 | dev->slot = slot; | |
304 | ||
62795041 AC |
305 | dev_dbg(&parent->dev, "dev %02x, created physical slot %s\n", |
306 | slot_nr, pci_slot_name(slot)); | |
f46753c5 | 307 | |
5fe6cc60 | 308 | out: |
3b5dd45e | 309 | kfree(slot_name); |
f46753c5 AC |
310 | up_write(&pci_bus_sem); |
311 | return slot; | |
5fe6cc60 | 312 | err: |
f46753c5 AC |
313 | kfree(slot); |
314 | slot = ERR_PTR(err); | |
315 | goto out; | |
316 | } | |
317 | EXPORT_SYMBOL_GPL(pci_create_slot); | |
318 | ||
319 | /** | |
d25b7c8d | 320 | * pci_renumber_slot - update %struct pci_slot -> number |
cffb2faf RD |
321 | * @slot: &struct pci_slot to update |
322 | * @slot_nr: new number for slot | |
f46753c5 AC |
323 | * |
324 | * The primary purpose of this interface is to allow callers who earlier | |
325 | * created a placeholder slot in pci_create_slot() by passing a -1 as | |
326 | * slot_nr, to update their %struct pci_slot with the correct @slot_nr. | |
327 | */ | |
d25b7c8d | 328 | void pci_renumber_slot(struct pci_slot *slot, int slot_nr) |
f46753c5 | 329 | { |
f46753c5 AC |
330 | struct pci_slot *tmp; |
331 | ||
332 | down_write(&pci_bus_sem); | |
333 | ||
334 | list_for_each_entry(tmp, &slot->bus->slots, list) { | |
335 | WARN_ON(tmp->number == slot_nr); | |
d25b7c8d | 336 | goto out; |
f46753c5 AC |
337 | } |
338 | ||
f46753c5 | 339 | slot->number = slot_nr; |
d25b7c8d | 340 | out: |
f46753c5 AC |
341 | up_write(&pci_bus_sem); |
342 | } | |
d25b7c8d | 343 | EXPORT_SYMBOL_GPL(pci_renumber_slot); |
f46753c5 AC |
344 | |
345 | /** | |
346 | * pci_destroy_slot - decrement refcount for physical PCI slot | |
347 | * @slot: struct pci_slot to decrement | |
348 | * | |
349 | * %struct pci_slot is refcounted, so destroying them is really easy; we | |
350 | * just call kobject_put on its kobj and let our release methods do the | |
351 | * rest. | |
352 | */ | |
f46753c5 AC |
353 | void pci_destroy_slot(struct pci_slot *slot) |
354 | { | |
62795041 AC |
355 | dev_dbg(&slot->bus->dev, "dev %02x, dec refcount to %d\n", |
356 | slot->number, atomic_read(&slot->kobj.kref.refcount) - 1); | |
f46753c5 AC |
357 | |
358 | down_write(&pci_bus_sem); | |
359 | kobject_put(&slot->kobj); | |
360 | up_write(&pci_bus_sem); | |
361 | } | |
362 | EXPORT_SYMBOL_GPL(pci_destroy_slot); | |
363 | ||
c825bc94 KK |
364 | #if defined(CONFIG_HOTPLUG_PCI) || defined(CONFIG_HOTPLUG_PCI_MODULE) |
365 | #include <linux/pci_hotplug.h> | |
366 | /** | |
367 | * pci_hp_create_link - create symbolic link to the hotplug driver module. | |
503998ca | 368 | * @pci_slot: struct pci_slot |
c825bc94 KK |
369 | * |
370 | * Helper function for pci_hotplug_core.c to create symbolic link to | |
371 | * the hotplug driver module. | |
372 | */ | |
373 | void pci_hp_create_module_link(struct pci_slot *pci_slot) | |
374 | { | |
375 | struct hotplug_slot *slot = pci_slot->hotplug; | |
376 | struct kobject *kobj = NULL; | |
377 | int no_warn; | |
378 | ||
379 | if (!slot || !slot->ops) | |
380 | return; | |
381 | kobj = kset_find_obj(module_kset, slot->ops->mod_name); | |
382 | if (!kobj) | |
383 | return; | |
384 | no_warn = sysfs_create_link(&pci_slot->kobj, kobj, "module"); | |
385 | kobject_put(kobj); | |
386 | } | |
387 | EXPORT_SYMBOL_GPL(pci_hp_create_module_link); | |
388 | ||
389 | /** | |
390 | * pci_hp_remove_link - remove symbolic link to the hotplug driver module. | |
503998ca | 391 | * @pci_slot: struct pci_slot |
c825bc94 KK |
392 | * |
393 | * Helper function for pci_hotplug_core.c to remove symbolic link to | |
394 | * the hotplug driver module. | |
395 | */ | |
396 | void pci_hp_remove_module_link(struct pci_slot *pci_slot) | |
397 | { | |
398 | sysfs_remove_link(&pci_slot->kobj, "module"); | |
399 | } | |
400 | EXPORT_SYMBOL_GPL(pci_hp_remove_module_link); | |
401 | #endif | |
402 | ||
f46753c5 AC |
403 | static int pci_slot_init(void) |
404 | { | |
405 | struct kset *pci_bus_kset; | |
406 | ||
407 | pci_bus_kset = bus_get_kset(&pci_bus_type); | |
408 | pci_slots_kset = kset_create_and_add("slots", NULL, | |
409 | &pci_bus_kset->kobj); | |
410 | if (!pci_slots_kset) { | |
411 | printk(KERN_ERR "PCI: Slot initialization failure\n"); | |
412 | return -ENOMEM; | |
413 | } | |
414 | return 0; | |
415 | } | |
416 | ||
417 | subsys_initcall(pci_slot_init); |