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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/module.h> |
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 | |
34 | static const struct sysfs_ops pci_slot_sysfs_ops = { |
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) |
42 | return sprintf(buf, "%04x:%02x\n", |
43 | pci_domain_nr(slot->bus), |
44 | slot->bus->number); |
45 | else |
46 | return sprintf(buf, "%04x:%02x:%02x\n", |
47 | pci_domain_nr(slot->bus), |
48 | slot->bus->number, |
49 | slot->number); |
50 | } |
51 | |
52 | /* these strings match up with the values in pci_bus_speed */ |
53 | static const char *pci_bus_speed_strings[] = { |
54 | "33 MHz PCI", /* 0x00 */ |
55 | "66 MHz PCI", /* 0x01 */ |
56 | "66 MHz PCI-X", /* 0x02 */ |
57 | "100 MHz PCI-X", /* 0x03 */ |
58 | "133 MHz PCI-X", /* 0x04 */ |
59 | NULL, /* 0x05 */ |
60 | NULL, /* 0x06 */ |
61 | NULL, /* 0x07 */ |
62 | NULL, /* 0x08 */ |
63 | "66 MHz PCI-X 266", /* 0x09 */ |
64 | "100 MHz PCI-X 266", /* 0x0a */ |
65 | "133 MHz PCI-X 266", /* 0x0b */ |
66 | "Unknown AGP", /* 0x0c */ |
67 | "1x AGP", /* 0x0d */ |
68 | "2x AGP", /* 0x0e */ |
69 | "4x AGP", /* 0x0f */ |
70 | "8x AGP", /* 0x10 */ |
71 | "66 MHz PCI-X 533", /* 0x11 */ |
72 | "100 MHz PCI-X 533", /* 0x12 */ |
73 | "133 MHz PCI-X 533", /* 0x13 */ |
74 | "2.5 GT/s PCIe", /* 0x14 */ |
75 | "5.0 GT/s PCIe", /* 0x15 */ |
76 | "8.0 GT/s PCIe", /* 0x16 */ |
77 | }; |
78 | |
79 | static ssize_t bus_speed_read(enum pci_bus_speed speed, char *buf) |
80 | { |
81 | const char *speed_string; |
82 | |
83 | if (speed < ARRAY_SIZE(pci_bus_speed_strings)) |
84 | speed_string = pci_bus_speed_strings[speed]; |
85 | else |
86 | speed_string = "Unknown"; |
87 | |
88 | return sprintf(buf, "%s\n", speed_string); |
89 | } |
90 | |
91 | static ssize_t max_speed_read_file(struct pci_slot *slot, char *buf) |
92 | { |
93 | return bus_speed_read(slot->bus->max_bus_speed, buf); |
94 | } |
95 | |
96 | static ssize_t cur_speed_read_file(struct pci_slot *slot, char *buf) |
97 | { |
98 | return bus_speed_read(slot->bus->cur_bus_speed, buf); |
99 | } |
100 | |
101 | static void pci_slot_release(struct kobject *kobj) |
102 | { |
103 | struct pci_dev *dev; |
104 | struct pci_slot *slot = to_pci_slot(kobj); |
105 | |
106 | dev_dbg(&slot->bus->dev, "dev %02x, released physical slot %s\n", |
107 | slot->number, pci_slot_name(slot)); |
108 | |
109 | list_for_each_entry(dev, &slot->bus->devices, bus_list) |
110 | if (PCI_SLOT(dev->devfn) == slot->number) |
111 | dev->slot = NULL; |
112 | |
113 | list_del(&slot->list); |
114 | |
115 | kfree(slot); |
116 | } |
117 | |
118 | static struct pci_slot_attribute pci_slot_attr_address = |
119 | __ATTR(address, (S_IFREG | S_IRUGO), address_read_file, NULL); |
120 | static struct pci_slot_attribute pci_slot_attr_max_speed = |
121 | __ATTR(max_bus_speed, (S_IFREG | S_IRUGO), max_speed_read_file, NULL); |
122 | static struct pci_slot_attribute pci_slot_attr_cur_speed = |
123 | __ATTR(cur_bus_speed, (S_IFREG | S_IRUGO), cur_speed_read_file, NULL); |
124 | |
125 | static struct attribute *pci_slot_default_attrs[] = { |
126 | &pci_slot_attr_address.attr, |
127 | &pci_slot_attr_max_speed.attr, |
128 | &pci_slot_attr_cur_speed.attr, |
129 | NULL, |
130 | }; |
131 | |
132 | static struct kobj_type pci_slot_ktype = { |
133 | .sysfs_ops = &pci_slot_sysfs_ops, |
134 | .release = &pci_slot_release, |
135 | .default_attrs = pci_slot_default_attrs, |
136 | }; |
137 | |
138 | static char *make_slot_name(const char *name) |
139 | { |
140 | char *new_name; |
141 | int len, max, dup; |
142 | |
143 | new_name = kstrdup(name, GFP_KERNEL); |
144 | if (!new_name) |
145 | return NULL; |
146 | |
147 | /* |
148 | * Make sure we hit the realloc case the first time through the |
149 | * loop. 'len' will be strlen(name) + 3 at that point which is |
150 | * enough space for "name-X" and the trailing NUL. |
151 | */ |
152 | len = strlen(name) + 2; |
153 | max = 1; |
154 | dup = 1; |
155 | |
156 | for (;;) { |
157 | struct kobject *dup_slot; |
158 | dup_slot = kset_find_obj(pci_slots_kset, new_name); |
159 | if (!dup_slot) |
160 | break; |
161 | kobject_put(dup_slot); |
162 | if (dup == max) { |
163 | len++; |
164 | max *= 10; |
165 | kfree(new_name); |
166 | new_name = kmalloc(len, GFP_KERNEL); |
167 | if (!new_name) |
168 | break; |
169 | } |
170 | sprintf(new_name, "%s-%d", name, dup++); |
171 | } |
172 | |
173 | return new_name; |
174 | } |
175 | |
176 | static int rename_slot(struct pci_slot *slot, const char *name) |
177 | { |
178 | int result = 0; |
179 | char *slot_name; |
180 | |
181 | if (strcmp(pci_slot_name(slot), name) == 0) |
182 | return result; |
183 | |
184 | slot_name = make_slot_name(name); |
185 | if (!slot_name) |
186 | return -ENOMEM; |
187 | |
188 | result = kobject_rename(&slot->kobj, slot_name); |
189 | kfree(slot_name); |
190 | |
191 | return result; |
192 | } |
193 | |
194 | static struct pci_slot *get_slot(struct pci_bus *parent, int slot_nr) |
195 | { |
196 | struct pci_slot *slot; |
197 | /* |
198 | * We already hold pci_bus_sem so don't worry |
199 | */ |
200 | list_for_each_entry(slot, &parent->slots, list) |
201 | if (slot->number == slot_nr) { |
202 | kobject_get(&slot->kobj); |
203 | return slot; |
204 | } |
205 | |
206 | return NULL; |
207 | } |
208 | |
209 | /** |
210 | * pci_create_slot - create or increment refcount for physical PCI slot |
211 | * @parent: struct pci_bus of parent bridge |
212 | * @slot_nr: PCI_SLOT(pci_dev->devfn) or -1 for placeholder |
213 | * @name: user visible string presented in /sys/bus/pci/slots/<name> |
214 | * @hotplug: set if caller is hotplug driver, NULL otherwise |
215 | * |
216 | * PCI slots have first class attributes such as address, speed, width, |
217 | * and a &struct pci_slot is used to manage them. This interface will |
218 | * either return a new &struct pci_slot to the caller, or if the pci_slot |
219 | * already exists, its refcount will be incremented. |
220 | * |
221 | * Slots are uniquely identified by a @pci_bus, @slot_nr tuple. |
222 | * |
223 | * There are known platforms with broken firmware that assign the same |
224 | * name to multiple slots. Workaround these broken platforms by renaming |
225 | * the slots on behalf of the caller. If firmware assigns name N to |
226 | * multiple slots: |
227 | * |
228 | * The first slot is assigned N |
229 | * The second slot is assigned N-1 |
230 | * The third slot is assigned N-2 |
231 | * etc. |
232 | * |
233 | * Placeholder slots: |
234 | * In most cases, @pci_bus, @slot_nr will be sufficient to uniquely identify |
235 | * a slot. There is one notable exception - pSeries (rpaphp), where the |
236 | * @slot_nr cannot be determined until a device is actually inserted into |
237 | * the slot. In this scenario, the caller may pass -1 for @slot_nr. |
238 | * |
239 | * The following semantics are imposed when the caller passes @slot_nr == |
240 | * -1. First, we no longer check for an existing %struct pci_slot, as there |
241 | * may be many slots with @slot_nr of -1. The other change in semantics is |
242 | * user-visible, which is the 'address' parameter presented in sysfs will |
243 | * consist solely of a dddd:bb tuple, where dddd is the PCI domain of the |
244 | * %struct pci_bus and bb is the bus number. In other words, the devfn of |
245 | * the 'placeholder' slot will not be displayed. |
246 | */ |
247 | struct pci_slot *pci_create_slot(struct pci_bus *parent, int slot_nr, |
248 | const char *name, |
249 | struct hotplug_slot *hotplug) |
250 | { |
251 | struct pci_dev *dev; |
252 | struct pci_slot *slot; |
253 | int err = 0; |
254 | char *slot_name = NULL; |
255 | |
256 | down_write(&pci_bus_sem); |
257 | |
258 | if (slot_nr == -1) |
259 | goto placeholder; |
260 | |
261 | /* |
262 | * Hotplug drivers are allowed to rename an existing slot, |
263 | * but only if not already claimed. |
264 | */ |
265 | slot = get_slot(parent, slot_nr); |
266 | if (slot) { |
267 | if (hotplug) { |
268 | if ((err = slot->hotplug ? -EBUSY : 0) |
269 | || (err = rename_slot(slot, name))) { |
270 | kobject_put(&slot->kobj); |
271 | slot = NULL; |
272 | goto err; |
273 | } |
274 | } |
275 | goto out; |
276 | } |
277 | |
278 | placeholder: |
279 | slot = kzalloc(sizeof(*slot), GFP_KERNEL); |
280 | if (!slot) { |
281 | err = -ENOMEM; |
282 | goto err; |
283 | } |
284 | |
285 | slot->bus = parent; |
286 | slot->number = slot_nr; |
287 | |
288 | slot->kobj.kset = pci_slots_kset; |
289 | |
290 | slot_name = make_slot_name(name); |
291 | if (!slot_name) { |
292 | err = -ENOMEM; |
293 | goto err; |
294 | } |
295 | |
296 | err = kobject_init_and_add(&slot->kobj, &pci_slot_ktype, NULL, |
297 | "%s", slot_name); |
298 | if (err) |
299 | goto err; |
300 | |
301 | INIT_LIST_HEAD(&slot->list); |
302 | list_add(&slot->list, &parent->slots); |
303 | |
304 | list_for_each_entry(dev, &parent->devices, bus_list) |
305 | if (PCI_SLOT(dev->devfn) == slot_nr) |
306 | dev->slot = slot; |
307 | |
308 | dev_dbg(&parent->dev, "dev %02x, created physical slot %s\n", |
309 | slot_nr, pci_slot_name(slot)); |
310 | |
311 | out: |
312 | kfree(slot_name); |
313 | up_write(&pci_bus_sem); |
314 | return slot; |
315 | err: |
316 | kfree(slot); |
317 | slot = ERR_PTR(err); |
318 | goto out; |
319 | } |
320 | EXPORT_SYMBOL_GPL(pci_create_slot); |
321 | |
322 | /** |
323 | * pci_renumber_slot - update %struct pci_slot -> number |
324 | * @slot: &struct pci_slot to update |
325 | * @slot_nr: new number for slot |
326 | * |
327 | * The primary purpose of this interface is to allow callers who earlier |
328 | * created a placeholder slot in pci_create_slot() by passing a -1 as |
329 | * slot_nr, to update their %struct pci_slot with the correct @slot_nr. |
330 | */ |
331 | void pci_renumber_slot(struct pci_slot *slot, int slot_nr) |
332 | { |
333 | struct pci_slot *tmp; |
334 | |
335 | down_write(&pci_bus_sem); |
336 | |
337 | list_for_each_entry(tmp, &slot->bus->slots, list) { |
338 | WARN_ON(tmp->number == slot_nr); |
339 | goto out; |
340 | } |
341 | |
342 | slot->number = slot_nr; |
343 | out: |
344 | up_write(&pci_bus_sem); |
345 | } |
346 | EXPORT_SYMBOL_GPL(pci_renumber_slot); |
347 | |
348 | /** |
349 | * pci_destroy_slot - decrement refcount for physical PCI slot |
350 | * @slot: struct pci_slot to decrement |
351 | * |
352 | * %struct pci_slot is refcounted, so destroying them is really easy; we |
353 | * just call kobject_put on its kobj and let our release methods do the |
354 | * rest. |
355 | */ |
356 | void pci_destroy_slot(struct pci_slot *slot) |
357 | { |
358 | dev_dbg(&slot->bus->dev, "dev %02x, dec refcount to %d\n", |
359 | slot->number, atomic_read(&slot->kobj.kref.refcount) - 1); |
360 | |
361 | down_write(&pci_bus_sem); |
362 | kobject_put(&slot->kobj); |
363 | up_write(&pci_bus_sem); |
364 | } |
365 | EXPORT_SYMBOL_GPL(pci_destroy_slot); |
366 | |
367 | #if defined(CONFIG_HOTPLUG_PCI) || defined(CONFIG_HOTPLUG_PCI_MODULE) |
368 | #include <linux/pci_hotplug.h> |
369 | /** |
370 | * pci_hp_create_link - create symbolic link to the hotplug driver module. |
371 | * @pci_slot: struct pci_slot |
372 | * |
373 | * Helper function for pci_hotplug_core.c to create symbolic link to |
374 | * the hotplug driver module. |
375 | */ |
376 | void pci_hp_create_module_link(struct pci_slot *pci_slot) |
377 | { |
378 | struct hotplug_slot *slot = pci_slot->hotplug; |
379 | struct kobject *kobj = NULL; |
380 | int no_warn; |
381 | |
382 | if (!slot || !slot->ops) |
383 | return; |
384 | kobj = kset_find_obj(module_kset, slot->ops->mod_name); |
385 | if (!kobj) |
386 | return; |
387 | no_warn = sysfs_create_link(&pci_slot->kobj, kobj, "module"); |
388 | kobject_put(kobj); |
389 | } |
390 | EXPORT_SYMBOL_GPL(pci_hp_create_module_link); |
391 | |
392 | /** |
393 | * pci_hp_remove_link - remove symbolic link to the hotplug driver module. |
394 | * @pci_slot: struct pci_slot |
395 | * |
396 | * Helper function for pci_hotplug_core.c to remove symbolic link to |
397 | * the hotplug driver module. |
398 | */ |
399 | void pci_hp_remove_module_link(struct pci_slot *pci_slot) |
400 | { |
401 | sysfs_remove_link(&pci_slot->kobj, "module"); |
402 | } |
403 | EXPORT_SYMBOL_GPL(pci_hp_remove_module_link); |
404 | #endif |
405 | |
406 | static int pci_slot_init(void) |
407 | { |
408 | struct kset *pci_bus_kset; |
409 | |
410 | pci_bus_kset = bus_get_kset(&pci_bus_type); |
411 | pci_slots_kset = kset_create_and_add("slots", NULL, |
412 | &pci_bus_kset->kobj); |
413 | if (!pci_slots_kset) { |
414 | printk(KERN_ERR "PCI: Slot initialization failure\n"); |
415 | return -ENOMEM; |
416 | } |
417 | return 0; |
418 | } |
419 | |
420 | subsys_initcall(pci_slot_init); |
421 |
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