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28#include <linux/module.h>
29#include <linux/moduleparam.h>
30#include <linux/kernel.h>
31#include <linux/types.h>
32#include <linux/list.h>
33#include <linux/kobject.h>
34#include <linux/sysfs.h>
35#include <linux/pagemap.h>
36#include <linux/init.h>
37#include <linux/mount.h>
38#include <linux/namei.h>
39#include <linux/mutex.h>
40#include <linux/pci.h>
41#include <linux/pci_hotplug.h>
42#include <asm/uaccess.h>
43#include "../pci.h"
44#include "cpci_hotplug.h"
45
46#define MY_NAME "pci_hotplug"
47
48#define dbg(fmt, arg...) do { if (debug) printk(KERN_DEBUG "%s: %s: " fmt, MY_NAME, __func__, ## arg); } while (0)
49#define err(format, arg...) printk(KERN_ERR "%s: " format, MY_NAME, ## arg)
50#define info(format, arg...) printk(KERN_INFO "%s: " format, MY_NAME, ## arg)
51#define warn(format, arg...) printk(KERN_WARNING "%s: " format, MY_NAME, ## arg)
52
53
54
55static bool debug;
56
57#define DRIVER_VERSION "0.5"
58#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Scott Murray <scottm@somanetworks.com>"
59#define DRIVER_DESC "PCI Hot Plug PCI Core"
60
61
62static LIST_HEAD(pci_hotplug_slot_list);
63static DEFINE_MUTEX(pci_hp_mutex);
64
65
66#define GET_STATUS(name, type) \
67static int get_##name(struct hotplug_slot *slot, type *value) \
68{ \
69 struct hotplug_slot_ops *ops = slot->ops; \
70 int retval = 0; \
71 if (!try_module_get(ops->owner)) \
72 return -ENODEV; \
73 if (ops->get_##name) \
74 retval = ops->get_##name(slot, value); \
75 else \
76 *value = slot->info->name; \
77 module_put(ops->owner); \
78 return retval; \
79}
80
81GET_STATUS(power_status, u8)
82GET_STATUS(attention_status, u8)
83GET_STATUS(latch_status, u8)
84GET_STATUS(adapter_status, u8)
85
86static ssize_t power_read_file(struct pci_slot *pci_slot, char *buf)
87{
88 int retval;
89 u8 value;
90
91 retval = get_power_status(pci_slot->hotplug, &value);
92 if (retval)
93 return retval;
94
95 return sprintf(buf, "%d\n", value);
96}
97
98static ssize_t power_write_file(struct pci_slot *pci_slot, const char *buf,
99 size_t count)
100{
101 struct hotplug_slot *slot = pci_slot->hotplug;
102 unsigned long lpower;
103 u8 power;
104 int retval = 0;
105
106 lpower = simple_strtoul(buf, NULL, 10);
107 power = (u8)(lpower & 0xff);
108 dbg("power = %d\n", power);
109
110 if (!try_module_get(slot->ops->owner)) {
111 retval = -ENODEV;
112 goto exit;
113 }
114 switch (power) {
115 case 0:
116 if (slot->ops->disable_slot)
117 retval = slot->ops->disable_slot(slot);
118 break;
119
120 case 1:
121 if (slot->ops->enable_slot)
122 retval = slot->ops->enable_slot(slot);
123 break;
124
125 default:
126 err("Illegal value specified for power\n");
127 retval = -EINVAL;
128 }
129 module_put(slot->ops->owner);
130
131exit:
132 if (retval)
133 return retval;
134 return count;
135}
136
137static struct pci_slot_attribute hotplug_slot_attr_power = {
138 .attr = {.name = "power", .mode = S_IFREG | S_IRUGO | S_IWUSR},
139 .show = power_read_file,
140 .store = power_write_file
141};
142
143static ssize_t attention_read_file(struct pci_slot *pci_slot, char *buf)
144{
145 int retval;
146 u8 value;
147
148 retval = get_attention_status(pci_slot->hotplug, &value);
149 if (retval)
150 return retval;
151
152 return sprintf(buf, "%d\n", value);
153}
154
155static ssize_t attention_write_file(struct pci_slot *pci_slot, const char *buf,
156 size_t count)
157{
158 struct hotplug_slot_ops *ops = pci_slot->hotplug->ops;
159 unsigned long lattention;
160 u8 attention;
161 int retval = 0;
162
163 lattention = simple_strtoul(buf, NULL, 10);
164 attention = (u8)(lattention & 0xff);
165 dbg(" - attention = %d\n", attention);
166
167 if (!try_module_get(ops->owner)) {
168 retval = -ENODEV;
169 goto exit;
170 }
171 if (ops->set_attention_status)
172 retval = ops->set_attention_status(pci_slot->hotplug, attention);
173 module_put(ops->owner);
174
175exit:
176 if (retval)
177 return retval;
178 return count;
179}
180
181static struct pci_slot_attribute hotplug_slot_attr_attention = {
182 .attr = {.name = "attention", .mode = S_IFREG | S_IRUGO | S_IWUSR},
183 .show = attention_read_file,
184 .store = attention_write_file
185};
186
187static ssize_t latch_read_file(struct pci_slot *pci_slot, char *buf)
188{
189 int retval;
190 u8 value;
191
192 retval = get_latch_status(pci_slot->hotplug, &value);
193 if (retval)
194 return retval;
195
196 return sprintf(buf, "%d\n", value);
197}
198
199static struct pci_slot_attribute hotplug_slot_attr_latch = {
200 .attr = {.name = "latch", .mode = S_IFREG | S_IRUGO},
201 .show = latch_read_file,
202};
203
204static ssize_t presence_read_file(struct pci_slot *pci_slot, char *buf)
205{
206 int retval;
207 u8 value;
208
209 retval = get_adapter_status(pci_slot->hotplug, &value);
210 if (retval)
211 return retval;
212
213 return sprintf(buf, "%d\n", value);
214}
215
216static struct pci_slot_attribute hotplug_slot_attr_presence = {
217 .attr = {.name = "adapter", .mode = S_IFREG | S_IRUGO},
218 .show = presence_read_file,
219};
220
221static ssize_t test_write_file(struct pci_slot *pci_slot, const char *buf,
222 size_t count)
223{
224 struct hotplug_slot *slot = pci_slot->hotplug;
225 unsigned long ltest;
226 u32 test;
227 int retval = 0;
228
229 ltest = simple_strtoul(buf, NULL, 10);
230 test = (u32)(ltest & 0xffffffff);
231 dbg("test = %d\n", test);
232
233 if (!try_module_get(slot->ops->owner)) {
234 retval = -ENODEV;
235 goto exit;
236 }
237 if (slot->ops->hardware_test)
238 retval = slot->ops->hardware_test(slot, test);
239 module_put(slot->ops->owner);
240
241exit:
242 if (retval)
243 return retval;
244 return count;
245}
246
247static struct pci_slot_attribute hotplug_slot_attr_test = {
248 .attr = {.name = "test", .mode = S_IFREG | S_IRUGO | S_IWUSR},
249 .store = test_write_file
250};
251
252static bool has_power_file(struct pci_slot *pci_slot)
253{
254 struct hotplug_slot *slot = pci_slot->hotplug;
255
256 if ((!slot) || (!slot->ops))
257 return false;
258 if ((slot->ops->enable_slot) ||
259 (slot->ops->disable_slot) ||
260 (slot->ops->get_power_status))
261 return true;
262 return false;
263}
264
265static bool has_attention_file(struct pci_slot *pci_slot)
266{
267 struct hotplug_slot *slot = pci_slot->hotplug;
268
269 if ((!slot) || (!slot->ops))
270 return false;
271 if ((slot->ops->set_attention_status) ||
272 (slot->ops->get_attention_status))
273 return true;
274 return false;
275}
276
277static bool has_latch_file(struct pci_slot *pci_slot)
278{
279 struct hotplug_slot *slot = pci_slot->hotplug;
280
281 if ((!slot) || (!slot->ops))
282 return false;
283 if (slot->ops->get_latch_status)
284 return true;
285 return false;
286}
287
288static bool has_adapter_file(struct pci_slot *pci_slot)
289{
290 struct hotplug_slot *slot = pci_slot->hotplug;
291
292 if ((!slot) || (!slot->ops))
293 return false;
294 if (slot->ops->get_adapter_status)
295 return true;
296 return false;
297}
298
299static bool has_test_file(struct pci_slot *pci_slot)
300{
301 struct hotplug_slot *slot = pci_slot->hotplug;
302
303 if ((!slot) || (!slot->ops))
304 return false;
305 if (slot->ops->hardware_test)
306 return true;
307 return false;
308}
309
310static int fs_add_slot(struct pci_slot *pci_slot)
311{
312 int retval = 0;
313
314
315 pci_hp_create_module_link(pci_slot);
316
317 if (has_power_file(pci_slot)) {
318 retval = sysfs_create_file(&pci_slot->kobj,
319 &hotplug_slot_attr_power.attr);
320 if (retval)
321 goto exit_power;
322 }
323
324 if (has_attention_file(pci_slot)) {
325 retval = sysfs_create_file(&pci_slot->kobj,
326 &hotplug_slot_attr_attention.attr);
327 if (retval)
328 goto exit_attention;
329 }
330
331 if (has_latch_file(pci_slot)) {
332 retval = sysfs_create_file(&pci_slot->kobj,
333 &hotplug_slot_attr_latch.attr);
334 if (retval)
335 goto exit_latch;
336 }
337
338 if (has_adapter_file(pci_slot)) {
339 retval = sysfs_create_file(&pci_slot->kobj,
340 &hotplug_slot_attr_presence.attr);
341 if (retval)
342 goto exit_adapter;
343 }
344
345 if (has_test_file(pci_slot)) {
346 retval = sysfs_create_file(&pci_slot->kobj,
347 &hotplug_slot_attr_test.attr);
348 if (retval)
349 goto exit_test;
350 }
351
352 goto exit;
353
354exit_test:
355 if (has_adapter_file(pci_slot))
356 sysfs_remove_file(&pci_slot->kobj,
357 &hotplug_slot_attr_presence.attr);
358exit_adapter:
359 if (has_latch_file(pci_slot))
360 sysfs_remove_file(&pci_slot->kobj, &hotplug_slot_attr_latch.attr);
361exit_latch:
362 if (has_attention_file(pci_slot))
363 sysfs_remove_file(&pci_slot->kobj,
364 &hotplug_slot_attr_attention.attr);
365exit_attention:
366 if (has_power_file(pci_slot))
367 sysfs_remove_file(&pci_slot->kobj, &hotplug_slot_attr_power.attr);
368exit_power:
369 pci_hp_remove_module_link(pci_slot);
370exit:
371 return retval;
372}
373
374static void fs_remove_slot(struct pci_slot *pci_slot)
375{
376 if (has_power_file(pci_slot))
377 sysfs_remove_file(&pci_slot->kobj, &hotplug_slot_attr_power.attr);
378
379 if (has_attention_file(pci_slot))
380 sysfs_remove_file(&pci_slot->kobj,
381 &hotplug_slot_attr_attention.attr);
382
383 if (has_latch_file(pci_slot))
384 sysfs_remove_file(&pci_slot->kobj, &hotplug_slot_attr_latch.attr);
385
386 if (has_adapter_file(pci_slot))
387 sysfs_remove_file(&pci_slot->kobj,
388 &hotplug_slot_attr_presence.attr);
389
390 if (has_test_file(pci_slot))
391 sysfs_remove_file(&pci_slot->kobj, &hotplug_slot_attr_test.attr);
392
393 pci_hp_remove_module_link(pci_slot);
394}
395
396static struct hotplug_slot *get_slot_from_name(const char *name)
397{
398 struct hotplug_slot *slot;
399
400 list_for_each_entry(slot, &pci_hotplug_slot_list, slot_list) {
401 if (strcmp(hotplug_slot_name(slot), name) == 0)
402 return slot;
403 }
404 return NULL;
405}
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420
421int __pci_hp_register(struct hotplug_slot *slot, struct pci_bus *bus,
422 int devnr, const char *name,
423 struct module *owner, const char *mod_name)
424{
425 int result;
426 struct pci_slot *pci_slot;
427
428 if (slot == NULL)
429 return -ENODEV;
430 if ((slot->info == NULL) || (slot->ops == NULL))
431 return -EINVAL;
432 if (slot->release == NULL) {
433 dbg("Why are you trying to register a hotplug slot without a proper release function?\n");
434 return -EINVAL;
435 }
436
437 slot->ops->owner = owner;
438 slot->ops->mod_name = mod_name;
439
440 mutex_lock(&pci_hp_mutex);
441
442
443
444
445
446 pci_slot = pci_create_slot(bus, devnr, name, slot);
447 if (IS_ERR(pci_slot)) {
448 result = PTR_ERR(pci_slot);
449 goto out;
450 }
451
452 slot->pci_slot = pci_slot;
453 pci_slot->hotplug = slot;
454
455 list_add(&slot->slot_list, &pci_hotplug_slot_list);
456
457 result = fs_add_slot(pci_slot);
458 kobject_uevent(&pci_slot->kobj, KOBJ_ADD);
459 dbg("Added slot %s to the list\n", name);
460out:
461 mutex_unlock(&pci_hp_mutex);
462 return result;
463}
464EXPORT_SYMBOL_GPL(__pci_hp_register);
465
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473
474
475int pci_hp_deregister(struct hotplug_slot *slot)
476{
477 struct hotplug_slot *temp;
478 struct pci_slot *pci_slot;
479
480 if (!slot)
481 return -ENODEV;
482
483 mutex_lock(&pci_hp_mutex);
484 temp = get_slot_from_name(hotplug_slot_name(slot));
485 if (temp != slot) {
486 mutex_unlock(&pci_hp_mutex);
487 return -ENODEV;
488 }
489
490 list_del(&slot->slot_list);
491
492 pci_slot = slot->pci_slot;
493 fs_remove_slot(pci_slot);
494 dbg("Removed slot %s from the list\n", hotplug_slot_name(slot));
495
496 slot->release(slot);
497 pci_slot->hotplug = NULL;
498 pci_destroy_slot(pci_slot);
499 mutex_unlock(&pci_hp_mutex);
500
501 return 0;
502}
503EXPORT_SYMBOL_GPL(pci_hp_deregister);
504
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514
515int pci_hp_change_slot_info(struct hotplug_slot *slot,
516 struct hotplug_slot_info *info)
517{
518 if (!slot || !info)
519 return -ENODEV;
520
521 memcpy(slot->info, info, sizeof(struct hotplug_slot_info));
522
523 return 0;
524}
525EXPORT_SYMBOL_GPL(pci_hp_change_slot_info);
526
527static int __init pci_hotplug_init(void)
528{
529 int result;
530
531 result = cpci_hotplug_init(debug);
532 if (result) {
533 err("cpci_hotplug_init with error %d\n", result);
534 return result;
535 }
536
537 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
538 return result;
539}
540
541static void __exit pci_hotplug_exit(void)
542{
543 cpci_hotplug_exit();
544}
545
546module_init(pci_hotplug_init);
547module_exit(pci_hotplug_exit);
548
549MODULE_AUTHOR(DRIVER_AUTHOR);
550MODULE_DESCRIPTION(DRIVER_DESC);
551MODULE_LICENSE("GPL");
552module_param(debug, bool, 0644);
553MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
554
