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3703987c EA |
1 | /* visorbus_main.c |
2 | * | |
3 | * Copyright � 2010 - 2013 UNISYS CORPORATION | |
4 | * All rights reserved. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or (at | |
9 | * your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
14 | * NON INFRINGEMENT. See the GNU General Public License for more | |
15 | * details. | |
16 | */ | |
17 | ||
18 | #include <linux/uuid.h> | |
19 | ||
4b78000e | 20 | #include "visorbus.h" |
c79b28f7 | 21 | #include "visorbus_private.h" |
4b78000e | 22 | #include "version.h" |
a9a7c767 | 23 | #include "timskmod.h" |
3703987c EA |
24 | #include "periodic_work.h" |
25 | #include "vbuschannel.h" | |
26 | #include "guestlinuxdebug.h" | |
27 | #include "vbusdeviceinfo.h" | |
4b78000e | 28 | |
c79b28f7 PB |
29 | #define MYDRVNAME "visorbus" |
30 | ||
4b78000e PB |
31 | /* module parameters */ |
32 | int visorbus_debug; | |
33 | int visorbus_forcematch; | |
34 | int visorbus_forcenomatch; | |
35 | #define MAXDEVICETEST 4 | |
36 | int visorbus_devicetest; | |
37 | int visorbus_debugref; | |
4b78000e PB |
38 | #define SERIALLOOPBACKCHANADDR (100 * 1024 * 1024) |
39 | ||
40 | /** This is the private data that we store for each bus device instance. | |
41 | */ | |
42 | struct visorbus_devdata { | |
43 | int devno; /* this is the chipset busNo */ | |
44 | struct list_head list_all; | |
45 | struct device *dev; | |
46 | struct kobject kobj; | |
47 | struct visorchannel *chan; /* channel area for bus itself */ | |
48 | bool vbus_valid; | |
49 | struct spar_vbus_headerinfo vbus_hdr_info; | |
50 | }; | |
51 | ||
3703987c EA |
52 | /* These forward declarations are required since our drivers are out-of-tree. |
53 | * The structures referenced are kernel-private and are not in the headers, but | |
54 | * it is impossible to make a functioning bus driver without them. | |
55 | */ | |
56 | struct subsys_private { | |
57 | struct kset subsys; | |
58 | struct kset *devices_kset; | |
59 | ||
60 | struct kset *drivers_kset; | |
61 | struct klist klist_devices; | |
62 | struct klist klist_drivers; | |
63 | struct blocking_notifier_head bus_notifier; | |
64 | unsigned int drivers_autoprobe:1; | |
65 | struct bus_type *bus; | |
66 | ||
67 | struct list_head class_interfaces; | |
68 | struct kset glue_dirs; | |
69 | struct mutex class_mutex; /* ignore */ | |
70 | struct class *class; | |
71 | }; | |
72 | ||
73 | struct bus_type_private { | |
74 | struct kset subsys; | |
75 | struct kset *drivers_kset; | |
76 | struct kset *devices_kset; | |
77 | struct klist klist_devices; | |
78 | struct klist klist_drivers; | |
79 | struct blocking_notifier_head bus_notifier; | |
80 | unsigned int drivers_autoprobe:1; | |
81 | struct bus_type *bus; | |
82 | }; | |
83 | ||
84 | #define CURRENT_FILE_PC VISOR_BUS_PC_visorbus_main_c | |
85 | #define POLLJIFFIES_TESTWORK 100 | |
86 | #define POLLJIFFIES_NORMALCHANNEL 10 | |
87 | ||
88 | static int visorbus_uevent(struct device *xdev, struct kobj_uevent_env *env); | |
89 | static int visorbus_match(struct device *xdev, struct device_driver *xdrv); | |
90 | static void fix_vbus_dev_info(struct visor_device *visordev); | |
91 | ||
92 | /** This describes the TYPE of bus. | |
93 | * (Don't confuse this with an INSTANCE of the bus.) | |
94 | */ | |
95 | static struct bus_type visorbus_type = { | |
96 | .name = "visorbus", | |
97 | .match = visorbus_match, | |
98 | .uevent = visorbus_uevent, | |
99 | }; | |
100 | ||
101 | static struct delayed_work periodic_work; | |
102 | ||
103 | /* YES, we need 2 workqueues. | |
104 | * The reason is, workitems on the test queue may need to cancel | |
105 | * workitems on the other queue. You will be in for trouble if you try to | |
106 | * do this with workitems queued on the same workqueue. | |
107 | */ | |
108 | static struct workqueue_struct *periodic_test_workqueue; | |
109 | static struct workqueue_struct *periodic_dev_workqueue; | |
110 | static long long bus_count; /** number of bus instances */ | |
111 | static long long total_devices_created; | |
112 | /** ever-increasing */ | |
113 | ||
114 | static void chipset_bus_create(u32 bus_no); | |
115 | static void chipset_bus_destroy(u32 bus_no); | |
116 | static void chipset_device_create(u32 bus_no, u32 dev_no); | |
117 | static void chipset_device_destroy(u32 bus_no, u32 dev_no); | |
118 | static void chipset_device_pause(u32 bus_no, u32 dev_no); | |
119 | static void chipset_device_resume(u32 bus_no, u32 dev_no); | |
120 | ||
121 | /** These functions are implemented herein, and are called by the chipset | |
122 | * driver to notify us about specific events. | |
123 | */ | |
124 | static struct visorchipset_busdev_notifiers chipset_notifiers = { | |
125 | .bus_create = chipset_bus_create, | |
126 | .bus_destroy = chipset_bus_destroy, | |
127 | .device_create = chipset_device_create, | |
128 | .device_destroy = chipset_device_destroy, | |
129 | .device_pause = chipset_device_pause, | |
130 | .device_resume = chipset_device_resume, | |
131 | }; | |
132 | ||
133 | /** These functions are implemented in the chipset driver, and we call them | |
134 | * herein when we want to acknowledge a specific event. | |
135 | */ | |
136 | static struct visorchipset_busdev_responders chipset_responders; | |
137 | ||
138 | /* filled in with info about parent chipset driver when we register with it */ | |
139 | static struct ultra_vbus_deviceinfo chipset_driverinfo; | |
140 | /* filled in with info about this driver, wrt it servicing client busses */ | |
141 | static struct ultra_vbus_deviceinfo clientbus_driverinfo; | |
142 | ||
143 | /** list of visorbus_devdata structs, linked via .list_all */ | |
144 | static LIST_HEAD(list_all_bus_instances); | |
145 | /** list of visor_device structs, linked via .list_all */ | |
146 | static LIST_HEAD(list_all_device_instances); | |
147 | ||
148 | static int | |
149 | visorbus_uevent(struct device *xdev, struct kobj_uevent_env *env) | |
150 | { | |
151 | if (add_uevent_var(env, "VERSION=%s", VERSION)) | |
152 | return -ENOMEM; | |
153 | return 0; | |
154 | } | |
155 | ||
156 | /* This is called automatically upon adding a visor_device (device_add), or | |
157 | * adding a visor_driver (visorbus_register_visor_driver), and returns 1 iff the | |
158 | * provided driver can control the specified device. | |
159 | */ | |
160 | static int | |
161 | visorbus_match(struct device *xdev, struct device_driver *xdrv) | |
162 | { | |
163 | uuid_le channel_type; | |
164 | int rc = 0; | |
165 | int i; | |
166 | struct visor_device *dev; | |
167 | struct visor_driver *drv; | |
168 | ||
169 | dev = to_visor_device(xdev); | |
170 | drv = to_visor_driver(xdrv); | |
171 | channel_type = visorchannel_get_uuid(dev->visorchannel); | |
172 | if (visorbus_forcematch) { | |
173 | rc = 1; | |
174 | goto away; | |
175 | } | |
176 | if (visorbus_forcenomatch) | |
177 | goto away; | |
178 | ||
179 | if (!drv->channel_types) | |
180 | goto away; | |
181 | for (i = 0; | |
182 | (uuid_le_cmp(drv->channel_types[i].guid, NULL_UUID_LE) != 0) || | |
183 | (drv->channel_types[i].name); | |
184 | i++) | |
185 | if (uuid_le_cmp(drv->channel_types[i].guid, | |
186 | channel_type) == 0) { | |
187 | rc = i + 1; | |
188 | goto away; | |
189 | } | |
190 | away: | |
191 | return rc; | |
192 | } | |
193 | ||
194 | /** This is called when device_unregister() is called for the bus device | |
195 | * instance, after all other tasks involved with destroying the device | |
196 | * are complete. | |
197 | */ | |
198 | static void | |
199 | visorbus_release_busdevice(struct device *xdev) | |
200 | { | |
201 | struct visorbus_devdata *devdata = dev_get_drvdata(xdev); | |
202 | ||
203 | dev_set_drvdata(xdev, NULL); | |
204 | kfree(devdata); | |
205 | kfree(xdev); | |
206 | } | |
207 | ||
208 | /** This is called when device_unregister() is called for each child | |
209 | * device instance. | |
210 | */ | |
211 | static void | |
212 | visorbus_release_device(struct device *xdev) | |
213 | { | |
214 | struct visor_device *dev = to_visor_device(xdev); | |
215 | ||
216 | if (dev->periodic_work) { | |
217 | visor_periodic_work_destroy(dev->periodic_work); | |
218 | dev->periodic_work = NULL; | |
219 | } | |
220 | if (dev->visorchannel) { | |
221 | visorchannel_destroy(dev->visorchannel); | |
222 | dev->visorchannel = NULL; | |
223 | } | |
224 | kfree(dev); | |
225 | } | |
226 | ||
32710457 PB |
227 | /* Implement publishing of device node attributes under: |
228 | * | |
229 | * /sys/bus/visorbus<x>/dev<y>/devmajorminor | |
230 | * | |
231 | */ | |
232 | ||
233 | #define to_devmajorminor_attr(_attr) \ | |
234 | container_of(_attr, struct devmajorminor_attribute, attr) | |
235 | #define to_visor_device_from_kobjdevmajorminor(obj) \ | |
236 | container_of(obj, struct visor_device, kobjdevmajorminor) | |
237 | ||
238 | struct devmajorminor_attribute { | |
239 | struct attribute attr; | |
240 | int slot; | |
241 | ssize_t (*show)(struct visor_device *, int slot, char *buf); | |
242 | ssize_t (*store)(struct visor_device *, int slot, const char *buf, | |
243 | size_t count); | |
244 | }; | |
245 | ||
246 | static ssize_t DEVMAJORMINOR_ATTR(struct visor_device *dev, int slot, char *buf) | |
247 | { | |
248 | int maxdevnodes = ARRAY_SIZE(dev->devnodes) / sizeof(dev->devnodes[0]); | |
249 | ||
250 | if (slot < 0 || slot >= maxdevnodes) | |
251 | return 0; | |
252 | return snprintf(buf, PAGE_SIZE, "%d:%d\n", | |
253 | dev->devnodes[slot].major, dev->devnodes[slot].minor); | |
254 | } | |
255 | ||
256 | static ssize_t | |
257 | devmajorminor_attr_show(struct kobject *kobj, struct attribute *attr, char *buf) | |
258 | { | |
259 | struct devmajorminor_attribute *devmajorminor_attr = | |
260 | to_devmajorminor_attr(attr); | |
261 | struct visor_device *dev = to_visor_device_from_kobjdevmajorminor(kobj); | |
262 | ssize_t ret = 0; | |
263 | ||
264 | if (devmajorminor_attr->show) | |
265 | ret = devmajorminor_attr->show(dev, | |
266 | devmajorminor_attr->slot, buf); | |
267 | return ret; | |
268 | } | |
269 | ||
270 | static ssize_t | |
271 | devmajorminor_attr_store(struct kobject *kobj, | |
272 | struct attribute *attr, const char *buf, size_t count) | |
273 | { | |
274 | struct devmajorminor_attribute *devmajorminor_attr = | |
275 | to_devmajorminor_attr(attr); | |
276 | struct visor_device *dev = to_visor_device_from_kobjdevmajorminor(kobj); | |
277 | ssize_t ret = 0; | |
278 | ||
279 | if (devmajorminor_attr->store) | |
280 | ret = devmajorminor_attr->store(dev, | |
281 | devmajorminor_attr->slot, | |
282 | buf, count); | |
283 | return ret; | |
284 | } | |
285 | ||
286 | static int register_devmajorminor_attributes(struct visor_device *dev); | |
287 | ||
288 | int | |
289 | devmajorminor_create_file(struct visor_device *dev, const char *name, | |
290 | int major, int minor) | |
291 | { | |
292 | int maxdevnodes = ARRAY_SIZE(dev->devnodes) / sizeof(dev->devnodes[0]); | |
293 | struct devmajorminor_attribute *myattr = NULL; | |
294 | int x = -1, rc = 0, slot = -1; | |
295 | ||
296 | register_devmajorminor_attributes(dev); | |
297 | for (slot = 0; slot < maxdevnodes; slot++) | |
298 | if (!dev->devnodes[slot].attr) | |
299 | break; | |
300 | if (slot == maxdevnodes) { | |
301 | rc = -ENOMEM; | |
302 | goto away; | |
303 | } | |
304 | myattr = kmalloc(sizeof(*myattr), GFP_KERNEL); | |
305 | if (!myattr) { | |
306 | rc = -ENOMEM; | |
307 | goto away; | |
308 | } | |
309 | memset(myattr, 0, sizeof(struct devmajorminor_attribute)); | |
310 | myattr->show = DEVMAJORMINOR_ATTR; | |
311 | myattr->store = NULL; | |
312 | myattr->slot = slot; | |
313 | myattr->attr.name = name; | |
314 | myattr->attr.mode = S_IRUGO; | |
315 | dev->devnodes[slot].attr = myattr; | |
316 | dev->devnodes[slot].major = major; | |
317 | dev->devnodes[slot].minor = minor; | |
318 | x = sysfs_create_file(&dev->kobjdevmajorminor, &myattr->attr); | |
319 | if (x < 0) { | |
320 | rc = x; | |
321 | goto away; | |
322 | } | |
323 | kobject_uevent(&dev->device.kobj, KOBJ_ONLINE); | |
324 | away: | |
325 | if (rc < 0) { | |
326 | kfree(myattr); | |
327 | myattr = NULL; | |
328 | dev->devnodes[slot].attr = NULL; | |
329 | } | |
330 | return rc; | |
331 | } | |
332 | ||
333 | void | |
334 | devmajorminor_remove_file(struct visor_device *dev, int slot) | |
335 | { | |
336 | int maxdevnodes = ARRAY_SIZE(dev->devnodes) / sizeof(dev->devnodes[0]); | |
337 | struct devmajorminor_attribute *myattr = NULL; | |
338 | ||
339 | if (slot < 0 || slot >= maxdevnodes) | |
340 | return; | |
341 | myattr = (struct devmajorminor_attribute *)(dev->devnodes[slot].attr); | |
342 | if (myattr) | |
343 | return; | |
344 | sysfs_remove_file(&dev->kobjdevmajorminor, &myattr->attr); | |
345 | kobject_uevent(&dev->device.kobj, KOBJ_OFFLINE); | |
346 | dev->devnodes[slot].attr = NULL; | |
347 | kfree(myattr); | |
348 | } | |
349 | ||
350 | void | |
351 | devmajorminor_remove_all_files(struct visor_device *dev) | |
352 | { | |
353 | int i = 0; | |
354 | int maxdevnodes = ARRAY_SIZE(dev->devnodes) / sizeof(dev->devnodes[0]); | |
355 | ||
356 | for (i = 0; i < maxdevnodes; i++) | |
357 | devmajorminor_remove_file(dev, i); | |
358 | } | |
359 | ||
360 | static const struct sysfs_ops devmajorminor_sysfs_ops = { | |
361 | .show = devmajorminor_attr_show, | |
362 | .store = devmajorminor_attr_store, | |
363 | }; | |
364 | ||
365 | static struct kobj_type devmajorminor_kobj_type = { | |
366 | .sysfs_ops = &devmajorminor_sysfs_ops | |
367 | }; | |
368 | ||
369 | static int | |
370 | register_devmajorminor_attributes(struct visor_device *dev) | |
371 | { | |
372 | int rc = 0, x = 0; | |
373 | ||
374 | if (dev->kobjdevmajorminor.parent) | |
375 | goto away; /* already registered */ | |
376 | x = kobject_init_and_add(&dev->kobjdevmajorminor, | |
377 | &devmajorminor_kobj_type, &dev->device.kobj, | |
378 | "devmajorminor"); | |
379 | if (x < 0) { | |
380 | rc = x; | |
381 | goto away; | |
382 | } | |
383 | ||
384 | kobject_uevent(&dev->kobjdevmajorminor, KOBJ_ADD); | |
385 | ||
386 | away: | |
387 | return rc; | |
388 | } | |
389 | ||
390 | void | |
391 | unregister_devmajorminor_attributes(struct visor_device *dev) | |
392 | { | |
393 | if (!dev->kobjdevmajorminor.parent) | |
394 | return; /* already unregistered */ | |
395 | devmajorminor_remove_all_files(dev); | |
396 | ||
397 | kobject_del(&dev->kobjdevmajorminor); | |
398 | kobject_put(&dev->kobjdevmajorminor); | |
399 | dev->kobjdevmajorminor.parent = NULL; | |
400 | } | |
401 | ||
826b6a0f PB |
402 | /* Implement publishing of channel attributes under: |
403 | * | |
404 | * /sys/bus/visorbus<x>/dev<y>/channel | |
405 | * | |
406 | */ | |
407 | ||
408 | #define to_channel_attr(_attr) \ | |
409 | container_of(_attr, struct channel_attribute, attr) | |
410 | #define to_visor_device_from_kobjchannel(obj) \ | |
411 | container_of(obj, struct visor_device, kobjchannel) | |
412 | ||
413 | struct channel_attribute { | |
414 | struct attribute attr; | |
415 | ssize_t (*show)(struct visor_device*, char *buf); | |
416 | ssize_t (*store)(struct visor_device*, const char *buf, size_t count); | |
417 | }; | |
418 | ||
419 | /* begin implementation of specific channel attributes to appear under | |
420 | * /sys/bus/visorbus<x>/dev<y>/channel | |
421 | */ | |
422 | static ssize_t devicechannel_attr_physaddr(struct visor_device *dev, char *buf) | |
423 | { | |
424 | if (!dev->visorchannel) | |
425 | return 0; | |
426 | return snprintf(buf, PAGE_SIZE, "0x%Lx\n", | |
427 | visorchannel_get_physaddr(dev->visorchannel)); | |
428 | } | |
429 | ||
430 | static ssize_t devicechannel_attr_nbytes(struct visor_device *dev, char *buf) | |
431 | { | |
432 | if (!dev->visorchannel) | |
433 | return 0; | |
434 | return snprintf(buf, PAGE_SIZE, "0x%lx\n", | |
435 | visorchannel_get_nbytes(dev->visorchannel)); | |
436 | } | |
437 | ||
438 | static ssize_t devicechannel_attr_clientpartition(struct visor_device *dev, | |
439 | char *buf) { | |
440 | if (!dev->visorchannel) | |
441 | return 0; | |
442 | return snprintf(buf, PAGE_SIZE, "0x%Lx\n", | |
443 | visorchannel_get_clientpartition(dev->visorchannel)); | |
444 | } | |
445 | ||
446 | static ssize_t devicechannel_attr_typeguid(struct visor_device *dev, char *buf) | |
447 | { | |
448 | char s[99]; | |
449 | ||
450 | if (!dev->visorchannel) | |
451 | return 0; | |
452 | return snprintf(buf, PAGE_SIZE, "%s\n", | |
453 | visorchannel_id(dev->visorchannel, s)); | |
454 | } | |
455 | ||
456 | static ssize_t devicechannel_attr_zoneguid(struct visor_device *dev, char *buf) | |
457 | { | |
458 | char s[99]; | |
459 | ||
460 | if (!dev->visorchannel) | |
461 | return 0; | |
462 | return snprintf(buf, PAGE_SIZE, "%s\n", | |
463 | visorchannel_zoneid(dev->visorchannel, s)); | |
464 | } | |
465 | ||
466 | static ssize_t devicechannel_attr_typename(struct visor_device *dev, char *buf) | |
467 | { | |
468 | int i = 0; | |
469 | struct bus_type *xbus = dev->device.bus; | |
470 | struct device_driver *xdrv = dev->device.driver; | |
471 | struct visor_driver *drv = NULL; | |
472 | ||
473 | if (!dev->visorchannel || !xbus || !xdrv) | |
474 | return 0; | |
475 | i = xbus->match(&dev->device, xdrv); | |
476 | if (!i) | |
477 | return 0; | |
478 | drv = to_visor_driver(xdrv); | |
479 | return snprintf(buf, PAGE_SIZE, "%s\n", drv->channel_types[i - 1].name); | |
480 | } | |
481 | ||
482 | static ssize_t devicechannel_attr_dump(struct visor_device *dev, char *buf) | |
483 | { | |
484 | int count = 0; | |
485 | /* TODO: replace this with debugfs code | |
486 | struct seq_file *m = NULL; | |
487 | if (dev->visorchannel == NULL) | |
488 | return 0; | |
489 | m = visor_seq_file_new_buffer(buf, PAGE_SIZE - 1); | |
490 | if (m == NULL) | |
491 | return 0; | |
492 | visorchannel_debug(dev->visorchannel, 1, m, 0); | |
493 | count = m->count; | |
494 | visor_seq_file_done_buffer(m); | |
495 | m = NULL; | |
496 | */ | |
497 | return count; | |
498 | } | |
499 | ||
500 | static struct channel_attribute all_channel_attrs[] = { | |
501 | __ATTR(physaddr, S_IRUGO, | |
502 | devicechannel_attr_physaddr, NULL), | |
503 | __ATTR(nbytes, S_IRUGO, | |
504 | devicechannel_attr_nbytes, NULL), | |
505 | __ATTR(clientpartition, S_IRUGO, | |
506 | devicechannel_attr_clientpartition, NULL), | |
507 | __ATTR(typeguid, S_IRUGO, | |
508 | devicechannel_attr_typeguid, NULL), | |
509 | __ATTR(zoneguid, S_IRUGO, | |
510 | devicechannel_attr_zoneguid, NULL), | |
511 | __ATTR(typename, S_IRUGO, | |
512 | devicechannel_attr_typename, NULL), | |
513 | __ATTR(dump, S_IRUGO, | |
514 | devicechannel_attr_dump, NULL), | |
515 | }; | |
516 | ||
517 | /* end implementation of specific channel attributes */ | |
518 | ||
519 | static ssize_t channel_attr_show(struct kobject *kobj, struct attribute *attr, | |
520 | char *buf) | |
521 | { | |
522 | struct channel_attribute *channel_attr = to_channel_attr(attr); | |
523 | struct visor_device *dev = to_visor_device_from_kobjchannel(kobj); | |
524 | ssize_t ret = 0; | |
525 | ||
526 | if (channel_attr->show) | |
527 | ret = channel_attr->show(dev, buf); | |
528 | return ret; | |
529 | } | |
530 | ||
531 | static ssize_t channel_attr_store(struct kobject *kobj, struct attribute *attr, | |
532 | const char *buf, size_t count) | |
533 | { | |
534 | struct channel_attribute *channel_attr = to_channel_attr(attr); | |
535 | struct visor_device *dev = to_visor_device_from_kobjchannel(kobj); | |
536 | ssize_t ret = 0; | |
537 | ||
538 | if (channel_attr->store) | |
539 | ret = channel_attr->store(dev, buf, count); | |
540 | return ret; | |
541 | } | |
542 | ||
543 | static int channel_create_file(struct visor_device *dev, | |
544 | struct channel_attribute *attr) | |
545 | { | |
546 | return sysfs_create_file(&dev->kobjchannel, &attr->attr); | |
547 | } | |
548 | ||
549 | static void channel_remove_file(struct visor_device *dev, | |
550 | struct channel_attribute *attr) | |
551 | { | |
552 | sysfs_remove_file(&dev->kobjchannel, &attr->attr); | |
553 | } | |
554 | ||
555 | static const struct sysfs_ops channel_sysfs_ops = { | |
556 | .show = channel_attr_show, | |
557 | .store = channel_attr_store, | |
558 | }; | |
559 | ||
560 | static struct kobj_type channel_kobj_type = { | |
561 | .sysfs_ops = &channel_sysfs_ops | |
562 | }; | |
563 | ||
564 | int register_channel_attributes(struct visor_device *dev) | |
565 | { | |
566 | int rc = 0, i = 0, x = 0; | |
567 | ||
568 | if (dev->kobjchannel.parent) | |
569 | goto away; /* already registered */ | |
570 | x = kobject_init_and_add(&dev->kobjchannel, &channel_kobj_type, | |
571 | &dev->device.kobj, "channel"); | |
572 | if (x < 0) { | |
573 | rc = x; | |
574 | goto away; | |
575 | } | |
576 | ||
577 | kobject_uevent(&dev->kobjchannel, KOBJ_ADD); | |
578 | ||
579 | for (i = 0; | |
580 | i < sizeof(all_channel_attrs) / sizeof(struct channel_attribute); | |
581 | i++) | |
582 | x = channel_create_file(dev, &all_channel_attrs[i]); | |
583 | if (x < 0) { | |
584 | while (--i >= 0) | |
585 | channel_remove_file(dev, &all_channel_attrs[i]); | |
586 | kobject_del(&dev->kobjchannel); | |
587 | kobject_put(&dev->kobjchannel); | |
588 | rc = x; | |
589 | goto away; | |
590 | } | |
591 | away: | |
592 | return rc; | |
593 | } | |
594 | ||
595 | void unregister_channel_attributes(struct visor_device *dev) | |
596 | { | |
597 | int i = 0; | |
598 | ||
599 | if (!dev->kobjchannel.parent) | |
600 | return; /* already unregistered */ | |
601 | for (i = 0; | |
602 | i < sizeof(all_channel_attrs) / sizeof(struct channel_attribute); | |
603 | i++) | |
604 | channel_remove_file(dev, &all_channel_attrs[i]); | |
605 | ||
606 | kobject_del(&dev->kobjchannel); | |
607 | kobject_put(&dev->kobjchannel); | |
608 | dev->kobjchannel.parent = NULL; | |
609 | } | |
a9a7c767 PB |
610 | /* This is actually something they forgot to put in the kernel. |
611 | * struct bus_type in the kernel SHOULD have a "busses" member, which | |
612 | * should be treated similarly to the "devices" and "drivers" members. | |
613 | * There SHOULD be: | |
614 | * - a "businst_attribute" analogous to the existing "bus_attribute" | |
615 | * - a "businst_create_file" and "businst_remove_file" analogous to the | |
616 | * existing "bus_create_file" and "bus_remove_file". | |
617 | * That's what I created businst.c and businst.h to do. | |
618 | * | |
619 | * We want to add the "busses" sub-tree in sysfs, where we will house the | |
620 | * names and properties of each bus instance: | |
621 | * | |
622 | * /sys/bus/<bustypename>/ | |
623 | * version | |
624 | * devices | |
625 | * <devname1> --> /sys/devices/<businstancename><devname1> | |
626 | * <devname2> --> /sys/devices/<businstancename><devname2> | |
627 | * drivers | |
628 | * <driverinstancename1> | |
629 | * <driverinstance1property1> | |
630 | * <driverinstance1property2> | |
631 | * ... | |
632 | * <driverinstancename2> | |
633 | * <driverinstance2property1> | |
634 | * <driverinstance2property2> | |
635 | * ... | |
636 | * >> busses | |
637 | * >> <businstancename1> | |
638 | * >> <businstance1property1> | |
639 | * >> <businstance1property2> | |
640 | * >> ... | |
641 | * >> <businstancename2> | |
642 | * >> <businstance2property1> | |
643 | * >> <businstance2property2> | |
644 | * >> ... | |
645 | * | |
646 | * I considered adding bus instance properties under | |
647 | * /sys/devices/<businstancename>. But I thought there may be existing | |
648 | * notions that ONLY device sub-trees should live under | |
649 | * /sys/devices/<businstancename>. So I stayed out of there. | |
650 | * | |
651 | */ | |
652 | ||
653 | struct businst_attribute { | |
654 | struct attribute attr; | |
655 | ssize_t (*show)(struct visorbus_devdata*, char *buf); | |
656 | ssize_t (*store)(struct visorbus_devdata*, const char *buf, | |
657 | size_t count); | |
658 | }; | |
659 | ||
660 | #define to_businst_attr(_attr) \ | |
661 | container_of(_attr, struct businst_attribute, attr) | |
662 | #define to_visorbus_devdata(obj) \ | |
663 | container_of(obj, struct visorbus_devdata, kobj) | |
664 | ||
665 | static ssize_t | |
666 | businst_attr_show(struct kobject *kobj, struct attribute *attr, | |
667 | char *buf) | |
668 | { | |
669 | struct businst_attribute *businst_attr = to_businst_attr(attr); | |
670 | struct visorbus_devdata *bus = to_visorbus_devdata(kobj); | |
671 | ssize_t ret = 0; | |
672 | ||
673 | if (businst_attr->show) | |
674 | ret = businst_attr->show(bus, buf); | |
675 | return ret; | |
676 | } | |
677 | ||
678 | static ssize_t | |
679 | businst_attr_store(struct kobject *kobj, struct attribute *attr, | |
680 | const char *buf, size_t count) | |
681 | { | |
682 | struct businst_attribute *businst_attr = to_businst_attr(attr); | |
683 | struct visorbus_devdata *bus = to_visorbus_devdata(kobj); | |
684 | ssize_t ret = 0; | |
685 | ||
686 | if (businst_attr->store) | |
687 | ret = businst_attr->store(bus, buf, count); | |
688 | return ret; | |
689 | } | |
690 | ||
691 | static int | |
692 | businst_create_file(struct visorbus_devdata *bus, | |
693 | struct businst_attribute *attr) | |
694 | { | |
695 | return sysfs_create_file(&bus->kobj, &attr->attr); | |
696 | } | |
697 | ||
698 | static void | |
699 | businst_remove_file(struct visorbus_devdata *bus, | |
700 | struct businst_attribute *attr) | |
701 | { | |
702 | sysfs_remove_file(&bus->kobj, &attr->attr); | |
703 | } | |
704 | ||
3703987c EA |
705 | static const struct sysfs_ops businst_sysfs_ops = { |
706 | .show = businst_attr_show, | |
707 | .store = businst_attr_store, | |
708 | }; | |
709 | ||
710 | static struct kobj_type businst_kobj_type = { | |
711 | .sysfs_ops = &businst_sysfs_ops | |
712 | }; | |
713 | ||
714 | static struct kset businstances = { /* should actually be a member of | |
715 | * bus_type */ | |
716 | }; | |
717 | ||
718 | /* BUS type attributes | |
719 | * | |
720 | * define & implement display of bus attributes under | |
721 | * /sys/bus/visorbus. | |
722 | * | |
723 | */ | |
724 | ||
725 | static ssize_t | |
726 | BUSTYPE_ATTR_version(struct bus_type *bus, char *buf) | |
727 | { | |
728 | return snprintf(buf, PAGE_SIZE, "%s\n", VERSION); | |
729 | } | |
730 | ||
731 | static struct bus_attribute bustype_attr_version = | |
732 | __ATTR(version, S_IRUGO, BUSTYPE_ATTR_version, NULL); | |
733 | ||
734 | static int | |
735 | register_bustype_attributes(void) | |
736 | { | |
737 | int rc = 0; | |
738 | ||
739 | rc = bus_create_file(&visorbus_type, &bustype_attr_version); | |
740 | if (rc < 0) | |
741 | goto away; | |
742 | ||
743 | /* Here we make up for the fact that bus_type does not yet have a | |
744 | * member to keep track of multiple bus instances for a given bus | |
745 | * type. This is useful for stashing properties for each bus | |
746 | * instance. | |
747 | */ | |
748 | kobject_set_name(&businstances.kobj, "busses"); | |
749 | businstances.kobj.ktype = &businst_kobj_type; | |
750 | businstances.kobj.parent = &visorbus_type.p->subsys.kobj; | |
751 | rc = kset_register(&businstances); | |
752 | if (rc < 0) | |
753 | goto away; | |
754 | ||
755 | rc = 0; | |
756 | away: | |
757 | return rc; | |
758 | } | |
759 | ||
760 | static void | |
761 | unregister_bustype_attributes(void) | |
762 | { | |
763 | bus_remove_file(&visorbus_type, &bustype_attr_version); | |
764 | kset_unregister(&businstances); | |
765 | } | |
766 | ||
767 | /* BUS instance attributes | |
768 | * | |
769 | * define & implement display of bus attributes under | |
770 | * /sys/bus/visorbus/busses/visorbus<n>. | |
771 | * | |
772 | * This is a bit hoaky because the kernel does not yet have the infrastructure | |
773 | * to separate bus INSTANCE attributes from bus TYPE attributes... | |
774 | * so we roll our own. See businst.c / businst.h. | |
775 | * | |
776 | */ | |
777 | ||
778 | static ssize_t businst_attr_partition_handle(struct visorbus_devdata *businst, | |
779 | char *buf) { | |
780 | struct visorchipset_bus_info bus_info; | |
781 | int len = 0; | |
782 | ||
783 | if (businst && visorchipset_get_bus_info(businst->devno, &bus_info)) | |
784 | len = snprintf(buf, PAGE_SIZE, | |
785 | "0x%Lx\n", | |
786 | (unsigned long long)bus_info.partition_handle); | |
787 | return len; | |
788 | } | |
789 | ||
790 | static ssize_t businst_attr_partition_guid(struct visorbus_devdata *businst, | |
791 | char *buf) { | |
792 | struct visorchipset_bus_info bus_info; | |
793 | int len = 0; | |
794 | ||
795 | if (businst && visorchipset_get_bus_info(businst->devno, &bus_info)) | |
796 | len = snprintf(buf, PAGE_SIZE, "{%pUb}\n", | |
797 | &bus_info.partition_uuid); | |
798 | return len; | |
799 | } | |
800 | ||
801 | static ssize_t businst_attr_partition_name(struct visorbus_devdata *businst, | |
802 | char *buf) { | |
803 | struct visorchipset_bus_info bus_info; | |
804 | int len = 0; | |
805 | ||
806 | if (businst && | |
807 | visorchipset_get_bus_info(businst->devno, &bus_info) && | |
808 | bus_info.name) | |
809 | len = snprintf(buf, PAGE_SIZE, "%s\n", bus_info.name); | |
810 | return len; | |
811 | } | |
812 | ||
813 | static ssize_t businst_attr_channel_addr(struct visorbus_devdata *businst, | |
814 | char *buf) { | |
815 | struct visorchipset_bus_info bus_info; | |
816 | int len = 0; | |
817 | ||
818 | if (businst && visorchipset_get_bus_info(businst->devno, &bus_info)) | |
819 | len = snprintf(buf, PAGE_SIZE, "0x%Lx\n", (unsigned long long) | |
820 | bus_info.chan_info.channel_addr); | |
821 | return len; | |
822 | } | |
823 | ||
824 | static ssize_t businst_attr_nchannel_bytes(struct visorbus_devdata *businst, | |
825 | char *buf) { | |
826 | struct visorchipset_bus_info bus_info; | |
827 | int len = 0; | |
828 | ||
829 | if (businst && visorchipset_get_bus_info(businst->devno, &bus_info)) | |
830 | len = snprintf(buf, PAGE_SIZE, "0x%Lx\n", (unsigned long long) | |
831 | bus_info.chan_info.n_channel_bytes); | |
832 | return len; | |
833 | } | |
834 | ||
835 | static ssize_t businst_attr_channel_id(struct visorbus_devdata *businst, | |
836 | char *buf) { | |
837 | int len = 0; | |
838 | ||
839 | if (businst && businst->chan) { | |
840 | visorchannel_id(businst->chan, buf); | |
841 | len = strlen(buf); | |
842 | buf[len++] = '\n'; | |
843 | } | |
844 | return len; | |
845 | } | |
846 | ||
847 | static ssize_t businst_attr_client_bus_info(struct visorbus_devdata *businst, | |
848 | char *buf) { | |
849 | struct visorchipset_bus_info bus_info; | |
850 | int i, x, remain = PAGE_SIZE; | |
851 | unsigned long off; | |
852 | char *p = buf; | |
853 | u8 *partition_name; | |
854 | struct ultra_vbus_deviceinfo dev_info; | |
855 | ||
856 | partition_name = ""; | |
857 | if (businst && businst->chan) { | |
858 | if (visorchipset_get_bus_info(businst->devno, &bus_info) && | |
859 | bus_info.name) | |
860 | partition_name = bus_info.name; | |
861 | x = snprintf(p, remain, | |
862 | "Client device / client driver info for %s partition (vbus #%d):\n", | |
863 | partition_name, businst->devno); | |
864 | p += x; | |
865 | remain -= x; | |
866 | x = visorchannel_read(businst->chan, | |
867 | offsetof(struct | |
868 | spar_vbus_channel_protocol, | |
869 | chp_info), | |
870 | &dev_info, sizeof(dev_info)); | |
871 | if (x >= 0) { | |
872 | x = vbuschannel_devinfo_to_string(&dev_info, p, | |
873 | remain, -1); | |
874 | p += x; | |
875 | remain -= x; | |
876 | } | |
877 | x = visorchannel_read(businst->chan, | |
878 | offsetof(struct | |
879 | spar_vbus_channel_protocol, | |
880 | bus_info), | |
881 | &dev_info, sizeof(dev_info)); | |
882 | if (x >= 0) { | |
883 | x = vbuschannel_devinfo_to_string(&dev_info, p, | |
884 | remain, -1); | |
885 | p += x; | |
886 | remain -= x; | |
887 | } | |
888 | off = offsetof(struct spar_vbus_channel_protocol, dev_info); | |
889 | i = 0; | |
890 | while (off + sizeof(dev_info) <= | |
891 | visorchannel_get_nbytes(businst->chan)) { | |
892 | x = visorchannel_read(businst->chan, | |
893 | off, &dev_info, sizeof(dev_info)); | |
894 | if (x >= 0) { | |
895 | x = vbuschannel_devinfo_to_string | |
896 | (&dev_info, p, remain, i); | |
897 | p += x; | |
898 | remain -= x; | |
899 | } | |
900 | off += sizeof(dev_info); | |
901 | i++; | |
902 | } | |
903 | } | |
904 | return PAGE_SIZE - remain; | |
905 | } | |
906 | ||
907 | static struct businst_attribute ba_partition_handle = | |
908 | __ATTR(partition_handle, S_IRUGO, businst_attr_partition_handle, NULL); | |
909 | static struct businst_attribute ba_partition_guid = | |
910 | __ATTR(partition_guid, S_IRUGO, businst_attr_partition_guid, NULL); | |
911 | static struct businst_attribute ba_partition_name = | |
912 | __ATTR(partition_name, S_IRUGO, businst_attr_partition_name, NULL); | |
913 | static struct businst_attribute ba_channel_addr = | |
914 | __ATTR(channel_addr, S_IRUGO, businst_attr_channel_addr, NULL); | |
915 | static struct businst_attribute ba_nchannel_bytes = | |
916 | __ATTR(nchannel_bytes, S_IRUGO, businst_attr_nchannel_bytes, NULL); | |
917 | static struct businst_attribute ba_channel_id = | |
918 | __ATTR(channel_id, S_IRUGO, businst_attr_channel_id, NULL); | |
919 | static struct businst_attribute ba_client_bus_info = | |
920 | __ATTR(client_bus_info, S_IRUGO, businst_attr_client_bus_info, NULL); | |
921 | ||
922 | static int | |
923 | register_businst_attributes(struct visorbus_devdata *businst) | |
924 | { | |
925 | int rc = 0; | |
926 | ||
927 | businst->kobj.kset = &businstances; /* identify parent sysfs dir */ | |
928 | rc = kobject_init_and_add(&businst->kobj, &businst_kobj_type, | |
929 | NULL, "visorbus%d", businst->devno); | |
930 | if (rc < 0) | |
931 | goto away; | |
932 | ||
933 | rc = businst_create_file(businst, &ba_partition_handle); | |
934 | if (rc < 0) | |
935 | goto away; | |
936 | ||
937 | rc = businst_create_file(businst, &ba_partition_guid); | |
938 | if (rc < 0) | |
939 | goto away; | |
940 | ||
941 | rc = businst_create_file(businst, &ba_partition_name); | |
942 | if (rc < 0) | |
943 | goto away; | |
944 | ||
945 | rc = businst_create_file(businst, &ba_channel_addr); | |
946 | if (rc < 0) | |
947 | goto away; | |
948 | ||
949 | rc = businst_create_file(businst, &ba_nchannel_bytes); | |
950 | if (rc < 0) | |
951 | goto away; | |
952 | ||
953 | rc = businst_create_file(businst, &ba_channel_id); | |
954 | if (rc < 0) | |
955 | goto away; | |
956 | ||
957 | rc = businst_create_file(businst, &ba_client_bus_info); | |
958 | if (rc < 0) | |
959 | goto away; | |
960 | ||
961 | kobject_uevent(&businst->kobj, KOBJ_ADD); | |
962 | ||
963 | rc = 0; | |
964 | away: | |
965 | return rc; | |
966 | } | |
967 | ||
968 | static void | |
969 | unregister_businst_attributes(struct visorbus_devdata *businst) | |
970 | { | |
971 | businst_remove_file(businst, &ba_partition_handle); | |
972 | businst_remove_file(businst, &ba_partition_guid); | |
973 | businst_remove_file(businst, &ba_partition_name); | |
974 | businst_remove_file(businst, &ba_channel_addr); | |
975 | businst_remove_file(businst, &ba_nchannel_bytes); | |
976 | businst_remove_file(businst, &ba_channel_id); | |
977 | businst_remove_file(businst, &ba_client_bus_info); | |
978 | kobject_put(&businst->kobj); | |
979 | } | |
980 | ||
981 | /* DRIVER attributes | |
982 | * | |
983 | * define & implement display of driver attributes under | |
984 | * /sys/bus/visorbus/drivers/<drivername>. | |
985 | * | |
986 | */ | |
987 | ||
988 | static ssize_t | |
989 | DRIVER_ATTR_version(struct device_driver *xdrv, char *buf) | |
990 | { | |
991 | struct visor_driver *drv = to_visor_driver(xdrv); | |
992 | ||
993 | return snprintf(buf, PAGE_SIZE, "%s\n", drv->version); | |
994 | } | |
995 | ||
996 | static int | |
997 | register_driver_attributes(struct visor_driver *drv) | |
998 | { | |
999 | int rc; | |
1000 | struct driver_attribute version = | |
1001 | __ATTR(version, S_IRUGO, DRIVER_ATTR_version, NULL); | |
1002 | drv->version_attr = version; | |
1003 | rc = driver_create_file(&drv->driver, &drv->version_attr); | |
1004 | return rc; | |
1005 | } | |
1006 | ||
1007 | static void | |
1008 | unregister_driver_attributes(struct visor_driver *drv) | |
1009 | { | |
1010 | driver_remove_file(&drv->driver, &drv->version_attr); | |
1011 | } | |
1012 | ||
1013 | /* DEVICE attributes | |
1014 | * | |
1015 | * define & implement display of device attributes under | |
1016 | * /sys/bus/visorbus/devices/<devicename>. | |
1017 | * | |
1018 | */ | |
1019 | ||
1020 | #define DEVATTR(nam, func) { \ | |
1021 | .attr = { .name = __stringify(nam), \ | |
1022 | .mode = 0444, \ | |
1023 | .owner = THIS_MODULE }, \ | |
1024 | .show = func, \ | |
1025 | } | |
1026 | ||
1027 | static struct device_attribute visor_device_attrs[] = { | |
1028 | /* DEVATTR(channel_nbytes, DEVICE_ATTR_channel_nbytes), */ | |
1029 | __ATTR_NULL | |
1030 | }; | |
1031 | ||
1032 | static void | |
1033 | dev_periodic_work(void *xdev) | |
1034 | { | |
1035 | struct visor_device *dev = (struct visor_device *)xdev; | |
1036 | struct visor_driver *drv = to_visor_driver(dev->device.driver); | |
1037 | ||
1038 | down(&dev->visordriver_callback_lock); | |
1039 | if (drv->channel_interrupt) | |
1040 | drv->channel_interrupt(dev); | |
1041 | up(&dev->visordriver_callback_lock); | |
1042 | if (!visor_periodic_work_nextperiod(dev->periodic_work)) | |
1043 | put_device(&dev->device); | |
1044 | } | |
1045 | ||
1046 | static void | |
1047 | dev_start_periodic_work(struct visor_device *dev) | |
1048 | { | |
1049 | if (dev->being_removed) | |
1050 | return; | |
1051 | /* now up by at least 2 */ | |
1052 | get_device(&dev->device); | |
1053 | if (!visor_periodic_work_start(dev->periodic_work)) | |
1054 | put_device(&dev->device); | |
1055 | } | |
1056 | ||
1057 | static void | |
1058 | dev_stop_periodic_work(struct visor_device *dev) | |
1059 | { | |
1060 | if (visor_periodic_work_stop(dev->periodic_work)) | |
1061 | put_device(&dev->device); | |
1062 | } | |
1063 | ||
1064 | /** This is called automatically upon adding a visor_device (device_add), or | |
1065 | * adding a visor_driver (visorbus_register_visor_driver), but only after | |
1066 | * visorbus_match has returned 1 to indicate a successful match between | |
1067 | * driver and device. | |
1068 | */ | |
1069 | static int | |
1070 | visordriver_probe_device(struct device *xdev) | |
1071 | { | |
1072 | int rc; | |
1073 | struct visor_driver *drv; | |
1074 | struct visor_device *dev; | |
1075 | ||
1076 | drv = to_visor_driver(xdev->driver); | |
1077 | dev = to_visor_device(xdev); | |
1078 | down(&dev->visordriver_callback_lock); | |
779d0752 | 1079 | dev->being_removed = false; |
3703987c EA |
1080 | /* |
1081 | * ensure that the dev->being_removed flag is cleared before | |
1082 | * we start the probe | |
1083 | */ | |
1084 | wmb(); | |
1085 | get_device(&dev->device); | |
1086 | if (!drv->probe) { | |
1087 | up(&dev->visordriver_callback_lock); | |
1088 | rc = -1; | |
1089 | goto away; | |
1090 | } | |
1091 | rc = drv->probe(dev); | |
1092 | if (rc < 0) | |
1093 | goto away; | |
1094 | ||
1095 | fix_vbus_dev_info(dev); | |
1096 | up(&dev->visordriver_callback_lock); | |
1097 | rc = 0; | |
1098 | away: | |
1099 | if (rc != 0) | |
1100 | put_device(&dev->device); | |
1101 | /* We could get here more than once if the child driver module is | |
1102 | * unloaded and re-loaded while devices are present. That's why we | |
1103 | * need a flag to be sure that we only respond to the device_create | |
1104 | * once. We cannot respond to the device_create prior to here, | |
1105 | * because until we call drv->probe() above, the channel has not been | |
1106 | * initialized. | |
1107 | */ | |
1108 | if (!dev->responded_to_device_create) { | |
779d0752 | 1109 | dev->responded_to_device_create = true; |
3703987c EA |
1110 | if (chipset_responders.device_create) |
1111 | (*chipset_responders.device_create)(dev->chipset_bus_no, | |
1112 | dev->chipset_dev_no, | |
1113 | rc); | |
1114 | } | |
1115 | return rc; | |
1116 | } | |
1117 | ||
1118 | /** This is called when device_unregister() is called for each child device | |
1119 | * instance, to notify the appropriate visorbus_driver that the device is | |
1120 | * going away, and to decrease the reference count of the device. | |
1121 | */ | |
1122 | static int | |
1123 | visordriver_remove_device(struct device *xdev) | |
1124 | { | |
1125 | int rc = 0; | |
1126 | struct visor_device *dev; | |
1127 | struct visor_driver *drv; | |
1128 | ||
1129 | dev = to_visor_device(xdev); | |
1130 | drv = to_visor_driver(xdev->driver); | |
1131 | down(&dev->visordriver_callback_lock); | |
779d0752 | 1132 | dev->being_removed = true; |
3703987c EA |
1133 | /* |
1134 | * ensure that the dev->being_removed flag is set before we start the | |
1135 | * actual removal | |
1136 | */ | |
1137 | wmb(); | |
1138 | if (drv) { | |
1139 | if (drv->remove) | |
1140 | drv->remove(dev); | |
1141 | } | |
1142 | up(&dev->visordriver_callback_lock); | |
1143 | dev_stop_periodic_work(dev); | |
1144 | devmajorminor_remove_all_files(dev); | |
1145 | ||
1146 | put_device(&dev->device); | |
1147 | ||
1148 | return rc; | |
1149 | } | |
1150 | ||
1151 | /** A particular type of visor driver calls this function to register | |
1152 | * the driver. The caller MUST fill in the following fields within the | |
1153 | * #drv structure: | |
1154 | * name, version, owner, channel_types, probe, remove | |
1155 | * | |
1156 | * Here's how the whole Linux bus / driver / device model works. | |
1157 | * | |
1158 | * At system start-up, the visorbus kernel module is loaded, which registers | |
1159 | * visorbus_type as a bus type, using bus_register(). | |
1160 | * | |
1161 | * All kernel modules that support particular device types on a | |
1162 | * visorbus bus are loaded. Each of these kernel modules calls | |
1163 | * visorbus_register_visor_driver() in their init functions, passing a | |
1164 | * visor_driver struct. visorbus_register_visor_driver() in turn calls | |
1165 | * register_driver(&visor_driver.driver). This .driver member is | |
1166 | * initialized with generic methods (like probe), whose sole responsibility | |
1167 | * is to act as a broker for the real methods, which are within the | |
1168 | * visor_driver struct. (This is the way the subclass behavior is | |
1169 | * implemented, since visor_driver is essentially a subclass of the | |
1170 | * generic driver.) Whenever a driver_register() happens, core bus code in | |
1171 | * the kernel does (see device_attach() in drivers/base/dd.c): | |
1172 | * | |
1173 | * for each dev associated with the bus (the bus that driver is on) that | |
1174 | * does not yet have a driver | |
1175 | * if bus.match(dev,newdriver) == yes_matched ** .match specified | |
1176 | * ** during bus_register(). | |
1177 | * newdriver.probe(dev) ** for visor drivers, this will call | |
1178 | * ** the generic driver.probe implemented in visorbus.c, | |
1179 | * ** which in turn calls the probe specified within the | |
1180 | * ** struct visor_driver (which was specified by the | |
1181 | * ** actual device driver as part of | |
1182 | * ** visorbus_register_visor_driver()). | |
1183 | * | |
1184 | * The above dance also happens when a new device appears. | |
1185 | * So the question is, how are devices created within the system? | |
1186 | * Basically, just call device_add(dev). See pci_bus_add_devices(). | |
1187 | * pci_scan_device() shows an example of how to build a device struct. It | |
1188 | * returns the newly-created struct to pci_scan_single_device(), who adds it | |
1189 | * to the list of devices at PCIBUS.devices. That list of devices is what | |
1190 | * is traversed by pci_bus_add_devices(). | |
1191 | * | |
1192 | */ | |
1193 | int visorbus_register_visor_driver(struct visor_driver *drv) | |
1194 | { | |
1195 | int rc = 0; | |
1196 | ||
1197 | drv->driver.name = drv->name; | |
1198 | drv->driver.bus = &visorbus_type; | |
1199 | drv->driver.probe = visordriver_probe_device; | |
1200 | drv->driver.remove = visordriver_remove_device; | |
1201 | drv->driver.owner = drv->owner; | |
1202 | ||
1203 | /* driver_register does this: | |
1204 | * bus_add_driver(drv) | |
1205 | * ->if (drv.bus) ** (bus_type) ** | |
1206 | * driver_attach(drv) | |
1207 | * for each dev with bus type of drv.bus | |
1208 | * if (!dev.drv) ** no driver assigned yet ** | |
1209 | * if (bus.match(dev,drv)) [visorbus_match] | |
1210 | * dev.drv = drv | |
1211 | * if (!drv.probe(dev)) [visordriver_probe_device] | |
1212 | * dev.drv = NULL | |
1213 | */ | |
1214 | ||
1215 | rc = driver_register(&drv->driver); | |
1216 | if (rc < 0) | |
1217 | return rc; | |
1218 | rc = register_driver_attributes(drv); | |
1219 | return rc; | |
1220 | } | |
1221 | EXPORT_SYMBOL_GPL(visorbus_register_visor_driver); | |
1222 | ||
1223 | /** A particular type of visor driver calls this function to unregister | |
1224 | * the driver, i.e., within its module_exit function. | |
1225 | */ | |
1226 | void | |
1227 | visorbus_unregister_visor_driver(struct visor_driver *drv) | |
1228 | { | |
1229 | unregister_driver_attributes(drv); | |
1230 | driver_unregister(&drv->driver); | |
1231 | } | |
1232 | EXPORT_SYMBOL_GPL(visorbus_unregister_visor_driver); | |
1233 | ||
1234 | int | |
1235 | visorbus_read_channel(struct visor_device *dev, unsigned long offset, | |
1236 | void *dest, unsigned long nbytes) | |
1237 | { | |
1238 | return visorchannel_read(dev->visorchannel, offset, dest, nbytes); | |
1239 | } | |
1240 | EXPORT_SYMBOL_GPL(visorbus_read_channel); | |
1241 | ||
1242 | int | |
1243 | visorbus_write_channel(struct visor_device *dev, unsigned long offset, | |
1244 | void *src, unsigned long nbytes) | |
1245 | { | |
1246 | return visorchannel_write(dev->visorchannel, offset, src, nbytes); | |
1247 | } | |
1248 | EXPORT_SYMBOL_GPL(visorbus_write_channel); | |
1249 | ||
1250 | int | |
1251 | visorbus_clear_channel(struct visor_device *dev, unsigned long offset, u8 ch, | |
1252 | unsigned long nbytes) | |
1253 | { | |
1254 | return visorchannel_clear(dev->visorchannel, offset, ch, nbytes); | |
1255 | } | |
1256 | EXPORT_SYMBOL_GPL(visorbus_clear_channel); | |
1257 | ||
1258 | int | |
1259 | visorbus_registerdevnode(struct visor_device *dev, | |
1260 | const char *name, int major, int minor) | |
1261 | { | |
1262 | return devmajorminor_create_file(dev, name, major, minor); | |
1263 | } | |
1264 | EXPORT_SYMBOL_GPL(visorbus_registerdevnode); | |
1265 | ||
1266 | /** We don't really have a real interrupt, so for now we just call the | |
1267 | * interrupt function periodically... | |
1268 | */ | |
1269 | void | |
1270 | visorbus_enable_channel_interrupts(struct visor_device *dev) | |
1271 | { | |
1272 | dev_start_periodic_work(dev); | |
1273 | } | |
1274 | EXPORT_SYMBOL_GPL(visorbus_enable_channel_interrupts); | |
1275 | ||
1276 | void | |
1277 | visorbus_disable_channel_interrupts(struct visor_device *dev) | |
1278 | { | |
1279 | dev_stop_periodic_work(dev); | |
1280 | } | |
1281 | EXPORT_SYMBOL_GPL(visorbus_disable_channel_interrupts); | |
1282 | ||
1283 | /** This is how everything starts from the device end. | |
1284 | * This function is called when a channel first appears via a ControlVM | |
1285 | * message. In response, this function allocates a visor_device to | |
1286 | * correspond to the new channel, and attempts to connect it the appropriate | |
1287 | * driver. If the appropriate driver is found, the visor_driver.probe() | |
1288 | * function for that driver will be called, and will be passed the new | |
1289 | * visor_device that we just created. | |
1290 | * | |
1291 | * It's ok if the appropriate driver is not yet loaded, because in that case | |
1292 | * the new device struct will just stick around in the bus' list of devices. | |
1293 | * When the appropriate driver calls visorbus_register_visor_driver(), the | |
1294 | * visor_driver.probe() for the new driver will be called with the new | |
1295 | * device. | |
1296 | */ | |
1297 | static int | |
1298 | create_visor_device(struct visorbus_devdata *devdata, | |
1299 | unsigned long chipset_bus_no, unsigned long chipset_dev_no, | |
1300 | struct visorchipset_channel_info chan_info, | |
1301 | u64 partition_handle) | |
1302 | { | |
1303 | int rc = -1; | |
1304 | struct visorchannel *visorchannel = NULL; | |
1305 | struct visor_device *dev = NULL; | |
779d0752 | 1306 | bool gotten = false, registered1 = false, registered2 = false; |
3703987c EA |
1307 | |
1308 | POSTCODE_LINUX_4(DEVICE_CREATE_ENTRY_PC, chipset_dev_no, chipset_bus_no, | |
1309 | POSTCODE_SEVERITY_INFO); | |
1310 | /* prepare chan_hdr (abstraction to read/write channel memory) */ | |
1311 | visorchannel = visorchannel_create(chan_info.channel_addr, | |
1312 | (unsigned long) | |
1313 | chan_info.n_channel_bytes, | |
1314 | chan_info.channel_type_uuid); | |
1315 | if (!visorchannel) { | |
1316 | POSTCODE_LINUX_3(DEVICE_CREATE_FAILURE_PC, chipset_dev_no, | |
1317 | DIAG_SEVERITY_ERR); | |
1318 | goto away; | |
1319 | } | |
1320 | dev = kmalloc(sizeof(*dev), GFP_KERNEL); | |
1321 | if (!dev) { | |
1322 | POSTCODE_LINUX_3(DEVICE_CREATE_FAILURE_PC, chipset_dev_no, | |
1323 | DIAG_SEVERITY_ERR); | |
1324 | goto away; | |
1325 | } | |
1326 | ||
1327 | memset(dev, 0, sizeof(struct visor_device)); | |
1328 | dev->visorchannel = visorchannel; | |
1329 | dev->channel_type_guid = chan_info.channel_type_uuid; | |
1330 | dev->channel_bytes = chan_info.n_channel_bytes; | |
1331 | dev->chipset_bus_no = chipset_bus_no; | |
1332 | dev->chipset_dev_no = chipset_dev_no; | |
1333 | dev->device.parent = devdata->dev; | |
1334 | sema_init(&dev->visordriver_callback_lock, 1); /* unlocked */ | |
1335 | dev->device.bus = &visorbus_type; | |
1336 | device_initialize(&dev->device); | |
1337 | dev->device.release = visorbus_release_device; | |
1338 | /* keep a reference just for us (now 2) */ | |
1339 | get_device(&dev->device); | |
779d0752 | 1340 | gotten = true; |
3703987c EA |
1341 | dev->periodic_work = |
1342 | visor_periodic_work_create(POLLJIFFIES_NORMALCHANNEL, | |
1343 | periodic_dev_workqueue, | |
1344 | dev_periodic_work, | |
1345 | dev, dev_name(&dev->device)); | |
1346 | if (!dev->periodic_work) { | |
1347 | POSTCODE_LINUX_3(DEVICE_CREATE_FAILURE_PC, chipset_dev_no, | |
1348 | DIAG_SEVERITY_ERR); | |
1349 | goto away; | |
1350 | } | |
1351 | ||
1352 | /* bus_id must be a unique name with respect to this bus TYPE | |
1353 | * (NOT bus instance). That's why we need to include the bus | |
1354 | * number within the name. | |
1355 | */ | |
1356 | dev_set_name(&dev->device, "vbus%lu:dev%lu", | |
1357 | chipset_bus_no, chipset_dev_no); | |
1358 | ||
1359 | /* device_add does this: | |
1360 | * bus_add_device(dev) | |
1361 | * ->device_attach(dev) | |
1362 | * ->for each driver drv registered on the bus that dev is on | |
1363 | * if (dev.drv) ** device already has a driver ** | |
1364 | * ** not sure we could ever get here... ** | |
1365 | * else | |
1366 | * if (bus.match(dev,drv)) [visorbus_match] | |
1367 | * dev.drv = drv | |
1368 | * if (!drv.probe(dev)) [visordriver_probe_device] | |
1369 | * dev.drv = NULL | |
1370 | * | |
1371 | * Note that device_add does NOT fail if no driver failed to | |
1372 | * claim the device. The device will be linked onto | |
1373 | * bus_type.klist_devices regardless (use bus_for_each_dev). | |
1374 | */ | |
1375 | rc = device_add(&dev->device); | |
1376 | if (rc < 0) { | |
1377 | POSTCODE_LINUX_3(DEVICE_ADD_PC, chipset_bus_no, | |
1378 | DIAG_SEVERITY_ERR); | |
1379 | goto away; | |
1380 | } | |
1381 | ||
1382 | /* note: device_register is simply device_initialize + device_add */ | |
1383 | rc = register_channel_attributes(dev); | |
1384 | if (rc < 0) { | |
1385 | POSTCODE_LINUX_3(DEVICE_REGISTER_FAILURE_PC, chipset_dev_no, | |
1386 | DIAG_SEVERITY_ERR); | |
1387 | goto away; | |
1388 | } | |
1389 | ||
779d0752 | 1390 | registered1 = true; |
3703987c EA |
1391 | |
1392 | rc = register_devmajorminor_attributes(dev); | |
1393 | if (rc < 0) { | |
1394 | POSTCODE_LINUX_3(DEVICE_REGISTER_FAILURE_PC, chipset_dev_no, | |
1395 | DIAG_SEVERITY_ERR); | |
1396 | goto away; | |
1397 | } | |
1398 | ||
779d0752 | 1399 | registered2 = true; |
3703987c EA |
1400 | rc = 0; |
1401 | ||
1402 | away: | |
1403 | if (rc < 0) { | |
1404 | if (registered2) | |
1405 | unregister_devmajorminor_attributes(dev); | |
1406 | if (registered1) | |
1407 | unregister_channel_attributes(dev); | |
1408 | if (gotten) | |
1409 | put_device(&dev->device); | |
1410 | if (visorchannel) | |
1411 | visorchannel_destroy(visorchannel); | |
1412 | kfree(dev); | |
1413 | } else { | |
1414 | total_devices_created++; | |
1415 | list_add_tail(&dev->list_all, &list_all_device_instances); | |
1416 | } | |
1417 | return rc; | |
1418 | } | |
1419 | ||
1420 | static void | |
1421 | remove_visor_device(struct visor_device *dev) | |
1422 | { | |
1423 | list_del(&dev->list_all); | |
1424 | unregister_devmajorminor_attributes(dev); | |
1425 | unregister_channel_attributes(dev); | |
1426 | put_device(&dev->device); | |
1427 | device_unregister(&dev->device); | |
1428 | } | |
1429 | ||
1430 | static struct visor_device * | |
1431 | find_visor_device_by_channel(HOSTADDRESS channel_physaddr) | |
1432 | { | |
1433 | struct list_head *listentry, *listtmp; | |
1434 | ||
1435 | list_for_each_safe(listentry, listtmp, &list_all_device_instances) { | |
1436 | struct visor_device *dev = list_entry(listentry, | |
1437 | struct visor_device, | |
1438 | list_all); | |
1439 | if (visorchannel_get_physaddr(dev->visorchannel) == | |
1440 | channel_physaddr) | |
1441 | return dev; | |
1442 | } | |
1443 | return NULL; | |
1444 | } | |
1445 | ||
1446 | static int | |
1447 | init_vbus_channel(struct visorchannel *chan) | |
1448 | { | |
1449 | int rc = -1; | |
1450 | unsigned long allocated_bytes = visorchannel_get_nbytes(chan); | |
1451 | struct spar_vbus_channel_protocol *x = | |
1452 | kmalloc(sizeof(struct spar_vbus_channel_protocol), | |
1453 | GFP_KERNEL); | |
1454 | ||
1455 | POSTCODE_LINUX_3(VBUS_CHANNEL_ENTRY_PC, rc, POSTCODE_SEVERITY_INFO); | |
1456 | ||
1457 | if (x) { | |
1458 | POSTCODE_LINUX_2(MALLOC_FAILURE_PC, POSTCODE_SEVERITY_ERR); | |
1459 | goto away; | |
1460 | } | |
1461 | if (visorchannel_clear(chan, 0, 0, allocated_bytes) < 0) { | |
1462 | POSTCODE_LINUX_2(VBUS_CHANNEL_FAILURE_PC, | |
1463 | POSTCODE_SEVERITY_ERR); | |
1464 | goto away; | |
1465 | } | |
1466 | if (visorchannel_read | |
1467 | (chan, 0, x, sizeof(struct spar_vbus_channel_protocol)) < 0) { | |
1468 | POSTCODE_LINUX_2(VBUS_CHANNEL_FAILURE_PC, | |
1469 | POSTCODE_SEVERITY_ERR); | |
1470 | goto away; | |
1471 | } | |
1472 | if (!SPAR_VBUS_CHANNEL_OK_SERVER(allocated_bytes)) { | |
1473 | POSTCODE_LINUX_2(VBUS_CHANNEL_FAILURE_PC, | |
1474 | POSTCODE_SEVERITY_ERR); | |
1475 | goto away; | |
1476 | } | |
1477 | ||
1478 | if (visorchannel_write | |
1479 | (chan, 0, x, sizeof(struct spar_vbus_channel_protocol)) < 0) { | |
1480 | POSTCODE_LINUX_3(VBUS_CHANNEL_FAILURE_PC, chan, | |
1481 | POSTCODE_SEVERITY_ERR); | |
1482 | goto away; | |
1483 | } | |
1484 | ||
1485 | POSTCODE_LINUX_3(VBUS_CHANNEL_EXIT_PC, chan, POSTCODE_SEVERITY_INFO); | |
1486 | rc = 0; | |
1487 | ||
1488 | away: | |
1489 | kfree(x); | |
1490 | x = NULL; | |
1491 | return rc; | |
1492 | } | |
1493 | ||
1494 | static int | |
1495 | get_vbus_header_info(struct visorchannel *chan, | |
1496 | struct spar_vbus_headerinfo *hdr_info) | |
1497 | { | |
1498 | int rc = -1; | |
1499 | ||
1500 | if (!SPAR_VBUS_CHANNEL_OK_CLIENT(visorchannel_get_header(chan))) | |
1501 | goto away; | |
1502 | if (visorchannel_read(chan, sizeof(struct channel_header), hdr_info, | |
1503 | sizeof(*hdr_info)) < 0) { | |
1504 | goto away; | |
1505 | } | |
1506 | if (hdr_info->struct_bytes < sizeof(struct spar_vbus_headerinfo)) | |
1507 | goto away; | |
1508 | if (hdr_info->device_info_struct_bytes < | |
1509 | sizeof(struct ultra_vbus_deviceinfo)) { | |
1510 | goto away; | |
1511 | } | |
1512 | rc = 0; | |
1513 | away: | |
1514 | return rc; | |
1515 | } | |
1516 | ||
1517 | /* Write the contents of <info> to the struct | |
1518 | * spar_vbus_channel_protocol.chp_info. */ | |
1519 | ||
1520 | static int | |
1521 | write_vbus_chp_info(struct visorchannel *chan, | |
1522 | struct spar_vbus_headerinfo *hdr_info, | |
1523 | struct ultra_vbus_deviceinfo *info) | |
1524 | { | |
1525 | int off = sizeof(struct channel_header) + hdr_info->chp_info_offset; | |
1526 | ||
1527 | if (hdr_info->chp_info_offset == 0) | |
1528 | return -1; | |
1529 | ||
1530 | if (visorchannel_write(chan, off, info, sizeof(*info)) < 0) | |
1531 | return -1; | |
1532 | return 0; | |
1533 | } | |
1534 | ||
1535 | /* Write the contents of <info> to the struct | |
1536 | * spar_vbus_channel_protocol.bus_info. */ | |
1537 | ||
1538 | static int | |
1539 | write_vbus_bus_info(struct visorchannel *chan, | |
1540 | struct spar_vbus_headerinfo *hdr_info, | |
1541 | struct ultra_vbus_deviceinfo *info) | |
1542 | { | |
1543 | int off = sizeof(struct channel_header) + hdr_info->bus_info_offset; | |
1544 | ||
1545 | if (hdr_info->bus_info_offset == 0) | |
1546 | return -1; | |
1547 | ||
1548 | if (visorchannel_write(chan, off, info, sizeof(*info)) < 0) | |
1549 | return -1; | |
1550 | return 0; | |
1551 | } | |
1552 | ||
1553 | /* Write the contents of <info> to the | |
1554 | * struct spar_vbus_channel_protocol.dev_info[<devix>]. | |
1555 | */ | |
1556 | static int | |
1557 | write_vbus_dev_info(struct visorchannel *chan, | |
1558 | struct spar_vbus_headerinfo *hdr_info, | |
1559 | struct ultra_vbus_deviceinfo *info, int devix) | |
1560 | { | |
1561 | int off = | |
1562 | (sizeof(struct channel_header) + hdr_info->dev_info_offset) + | |
1563 | (hdr_info->device_info_struct_bytes * devix); | |
1564 | ||
1565 | if (hdr_info->dev_info_offset == 0) | |
1566 | return -1; | |
1567 | ||
1568 | if (visorchannel_write(chan, off, info, sizeof(*info)) < 0) | |
1569 | return -1; | |
1570 | return 0; | |
1571 | } | |
1572 | ||
1573 | /* For a child device just created on a client bus, fill in | |
1574 | * information about the driver that is controlling this device into | |
1575 | * the the appropriate slot within the vbus channel of the bus | |
1576 | * instance. | |
1577 | */ | |
1578 | static void | |
1579 | fix_vbus_dev_info(struct visor_device *visordev) | |
1580 | { | |
1581 | int i; | |
1582 | struct visorchipset_bus_info bus_info; | |
1583 | struct visorbus_devdata *devdata = NULL; | |
1584 | struct visor_driver *visordrv; | |
1585 | int bus_no = visordev->chipset_bus_no; | |
1586 | int dev_no = visordev->chipset_dev_no; | |
1587 | struct ultra_vbus_deviceinfo dev_info; | |
1588 | const char *chan_type_name = NULL; | |
1589 | ||
1590 | if (!visordev->device.driver) | |
1591 | return; | |
1592 | ||
1593 | visordrv = to_visor_driver(visordev->device.driver); | |
1594 | if (!visorchipset_get_bus_info(bus_no, &bus_info)) | |
1595 | return; | |
1596 | ||
1597 | devdata = (struct visorbus_devdata *)(bus_info.bus_driver_context); | |
1598 | if (!devdata) | |
1599 | return; | |
1600 | ||
1601 | if (!devdata->vbus_valid) | |
1602 | return; | |
1603 | ||
1604 | /* Within the list of device types (by GUID) that the driver | |
1605 | * says it supports, find out which one of those types matches | |
1606 | * the type of this device, so that we can include the device | |
1607 | * type name | |
1608 | */ | |
1609 | for (i = 0; visordrv->channel_types[i].name; i++) { | |
1610 | if (STRUCTSEQUAL(visordrv->channel_types[i].guid, | |
1611 | visordev->channel_type_guid)) { | |
1612 | chan_type_name = visordrv->channel_types[i].name; | |
1613 | break; | |
1614 | } | |
1615 | } | |
1616 | ||
1617 | bus_device_info_init(&dev_info, chan_type_name, | |
1618 | visordrv->name, visordrv->version, | |
1619 | visordrv->vertag); | |
1620 | write_vbus_dev_info(devdata->chan, | |
1621 | &devdata->vbus_hdr_info, &dev_info, dev_no); | |
1622 | ||
1623 | /* Re-write bus+chipset info, because it is possible that this | |
1624 | * was previously written by our evil counterpart, virtpci. | |
1625 | */ | |
1626 | write_vbus_chp_info(devdata->chan, &devdata->vbus_hdr_info, | |
1627 | &chipset_driverinfo); | |
1628 | write_vbus_bus_info(devdata->chan, &devdata->vbus_hdr_info, | |
1629 | &clientbus_driverinfo); | |
1630 | } | |
1631 | ||
1632 | /** Create a device instance for the visor bus itself. | |
1633 | */ | |
1634 | static struct visorbus_devdata * | |
1635 | create_bus_instance(int id) | |
1636 | { | |
1637 | struct visorbus_devdata *rc = NULL; | |
1638 | struct visorbus_devdata *devdata = NULL; | |
1639 | struct device *dev; | |
1640 | struct visorchipset_bus_info bus_info; | |
1641 | ||
1642 | POSTCODE_LINUX_2(BUS_CREATE_ENTRY_PC, POSTCODE_SEVERITY_INFO); | |
1643 | dev = kmalloc(sizeof(*dev), GFP_KERNEL); | |
1644 | if (!dev) { | |
1645 | POSTCODE_LINUX_2(MALLOC_FAILURE_PC, POSTCODE_SEVERITY_ERR); | |
1646 | rc = NULL; | |
1647 | goto away; | |
1648 | } | |
1649 | memset(dev, 0, sizeof(struct device)); | |
1650 | dev_set_name(dev, "visorbus%d", id); | |
1651 | dev->release = visorbus_release_busdevice; | |
1652 | if (device_register(dev) < 0) { | |
1653 | POSTCODE_LINUX_3(DEVICE_CREATE_FAILURE_PC, id, | |
1654 | POSTCODE_SEVERITY_ERR); | |
1655 | rc = NULL; | |
1656 | goto away; | |
1657 | } | |
1658 | devdata = kmalloc(sizeof(*devdata), GFP_KERNEL); | |
1659 | if (!devdata) { | |
1660 | POSTCODE_LINUX_2(MALLOC_FAILURE_PC, POSTCODE_SEVERITY_ERR); | |
1661 | rc = NULL; | |
1662 | goto away; | |
1663 | } | |
1664 | memset(devdata, 0, sizeof(struct visorbus_devdata)); | |
1665 | devdata->devno = id; | |
1666 | devdata->dev = dev; | |
1667 | if ((visorchipset_get_bus_info(id, &bus_info)) && | |
1668 | (bus_info.chan_info.channel_addr > 0) && | |
1669 | (bus_info.chan_info.n_channel_bytes > 0)) { | |
1670 | HOSTADDRESS channel_addr = bus_info.chan_info.channel_addr; | |
1671 | unsigned long n_channel_bytes = | |
1672 | (unsigned long) | |
1673 | bus_info.chan_info.n_channel_bytes; | |
1674 | uuid_le channel_type_guid = | |
1675 | bus_info.chan_info.channel_type_uuid; | |
1676 | ||
1677 | devdata->chan = visorchannel_create(channel_addr, | |
1678 | n_channel_bytes, | |
1679 | channel_type_guid); | |
1680 | if (!devdata->chan) { | |
1681 | POSTCODE_LINUX_3(DEVICE_CREATE_FAILURE_PC, channel_addr, | |
1682 | POSTCODE_SEVERITY_ERR); | |
1683 | } else { | |
1684 | if (bus_info.flags.server) { | |
1685 | init_vbus_channel(devdata->chan); | |
1686 | } else { | |
1687 | if (get_vbus_header_info(devdata->chan, | |
1688 | &devdata-> | |
1689 | vbus_hdr_info) >= 0) { | |
779d0752 | 1690 | devdata->vbus_valid = true; |
3703987c EA |
1691 | write_vbus_chp_info(devdata->chan, |
1692 | &devdata-> | |
1693 | vbus_hdr_info, | |
1694 | &chipset_driverinfo | |
1695 | ); | |
1696 | write_vbus_bus_info(devdata->chan, | |
1697 | &devdata-> | |
1698 | vbus_hdr_info, | |
1699 | &clientbus_driverinfo); | |
1700 | } | |
1701 | } | |
1702 | } | |
1703 | } | |
1704 | register_businst_attributes(devdata); | |
1705 | bus_count++; | |
1706 | list_add_tail(&devdata->list_all, &list_all_bus_instances); | |
1707 | if (id == 0) | |
1708 | devdata = devdata; /* for testing ONLY */ | |
1709 | dev_set_drvdata(dev, devdata); | |
1710 | rc = devdata; | |
1711 | away: | |
1712 | return rc; | |
1713 | } | |
1714 | ||
1715 | /** Remove a device instance for the visor bus itself. | |
1716 | */ | |
1717 | static void | |
1718 | remove_bus_instance(struct visorbus_devdata *devdata) | |
1719 | { | |
1720 | /* Note that this will result in the release method for | |
1721 | * devdata->dev being called, which will call | |
1722 | * visorbus_release_busdevice(). This has something to do with | |
1723 | * the put_device() done in device_unregister(), but I have never | |
1724 | * successfully been able to trace thru the code to see where/how | |
1725 | * release() gets called. But I know it does. | |
1726 | */ | |
1727 | unregister_businst_attributes(devdata); | |
1728 | bus_count--; | |
1729 | if (devdata->chan) { | |
1730 | visorchannel_destroy(devdata->chan); | |
1731 | devdata->chan = NULL; | |
1732 | } | |
1733 | list_del(&devdata->list_all); | |
1734 | device_unregister(devdata->dev); | |
1735 | } | |
1736 | ||
1737 | /** Create and register the one-and-only one instance of | |
1738 | * the visor bus type (visorbus_type). | |
1739 | */ | |
1740 | static int | |
1741 | create_bus_type(void) | |
1742 | { | |
1743 | int rc = 0; | |
1744 | ||
1745 | visorbus_type.dev_attrs = visor_device_attrs; | |
1746 | rc = bus_register(&visorbus_type); | |
1747 | if (rc < 0) | |
1748 | return rc; | |
1749 | ||
1750 | rc = register_bustype_attributes(); | |
1751 | return rc; | |
1752 | } | |
1753 | ||
1754 | /** Remove the one-and-only one instance of the visor bus type (visorbus_type). | |
1755 | */ | |
1756 | static void | |
1757 | remove_bus_type(void) | |
1758 | { | |
1759 | unregister_bustype_attributes(); | |
1760 | bus_unregister(&visorbus_type); | |
1761 | } | |
1762 | ||
1763 | /** Remove all child visor bus device instances. | |
1764 | */ | |
1765 | static void | |
1766 | remove_all_visor_devices(void) | |
1767 | { | |
1768 | struct list_head *listentry, *listtmp; | |
1769 | ||
1770 | list_for_each_safe(listentry, listtmp, &list_all_device_instances) { | |
1771 | struct visor_device *dev = list_entry(listentry, | |
1772 | struct visor_device, | |
1773 | list_all); | |
1774 | remove_visor_device(dev); | |
1775 | } | |
1776 | } | |
1777 | ||
779d0752 | 1778 | static bool entered_testing_mode; |
3703987c EA |
1779 | static struct visorchipset_channel_info test_channel_infos[MAXDEVICETEST]; |
1780 | static unsigned long test_bus_nos[MAXDEVICETEST]; | |
1781 | static unsigned long test_dev_nos[MAXDEVICETEST]; | |
1782 | ||
1783 | static void | |
1784 | chipset_bus_create(u32 bus_no) | |
1785 | { | |
1786 | struct visorchipset_bus_info bus_info; | |
1787 | struct visorbus_devdata *devdata; | |
1788 | int rc = -1; | |
1789 | ||
1790 | POSTCODE_LINUX_3(BUS_CREATE_ENTRY_PC, bus_no, POSTCODE_SEVERITY_INFO); | |
1791 | if (!visorchipset_get_bus_info(bus_no, &bus_info)) | |
1792 | goto away; | |
1793 | devdata = create_bus_instance(bus_no); | |
1794 | if (!devdata) | |
1795 | goto away; | |
1796 | if (!visorchipset_set_bus_context(bus_no, devdata)) | |
1797 | goto away; | |
1798 | POSTCODE_LINUX_3(BUS_CREATE_EXIT_PC, bus_no, POSTCODE_SEVERITY_INFO); | |
1799 | rc = 0; | |
1800 | away: | |
1801 | if (rc < 0) { | |
1802 | POSTCODE_LINUX_3(BUS_CREATE_FAILURE_PC, bus_no, | |
1803 | POSTCODE_SEVERITY_ERR); | |
1804 | return; | |
1805 | } | |
1806 | POSTCODE_LINUX_3(CHIPSET_INIT_SUCCESS_PC, bus_no, | |
1807 | POSTCODE_SEVERITY_INFO); | |
1808 | if (chipset_responders.bus_create) | |
1809 | (*chipset_responders.bus_create) (bus_no, rc); | |
1810 | } | |
1811 | ||
1812 | static void | |
1813 | chipset_bus_destroy(u32 bus_no) | |
1814 | { | |
1815 | struct visorchipset_bus_info bus_info; | |
1816 | struct visorbus_devdata *devdata; | |
1817 | int rc = -1; | |
1818 | ||
1819 | if (!visorchipset_get_bus_info(bus_no, &bus_info)) | |
1820 | goto away; | |
1821 | devdata = (struct visorbus_devdata *)(bus_info.bus_driver_context); | |
1822 | if (!devdata) | |
1823 | goto away; | |
1824 | remove_bus_instance(devdata); | |
1825 | if (!visorchipset_set_bus_context(bus_no, NULL)) | |
1826 | goto away; | |
1827 | rc = 0; | |
1828 | away: | |
1829 | if (rc < 0) | |
1830 | return; | |
1831 | if (chipset_responders.bus_destroy) | |
1832 | (*chipset_responders.bus_destroy)(bus_no, rc); | |
1833 | } | |
1834 | ||
1835 | static void | |
1836 | chipset_device_create(u32 bus_no, u32 dev_no) | |
1837 | { | |
1838 | struct visorchipset_device_info dev_info; | |
1839 | struct visorchipset_bus_info bus_info; | |
1840 | struct visorbus_devdata *devdata = NULL; | |
1841 | int rc = -1; | |
1842 | ||
1843 | POSTCODE_LINUX_4(DEVICE_CREATE_ENTRY_PC, dev_no, bus_no, | |
1844 | POSTCODE_SEVERITY_INFO); | |
1845 | ||
1846 | if (entered_testing_mode) | |
1847 | return; | |
1848 | if (!visorchipset_get_device_info(bus_no, dev_no, &dev_info)) | |
1849 | goto away; | |
1850 | if (!visorchipset_get_bus_info(bus_no, &bus_info)) | |
1851 | goto away; | |
1852 | if (visorbus_devicetest) | |
1853 | if (total_devices_created < MAXDEVICETEST) { | |
1854 | test_channel_infos[total_devices_created] = | |
1855 | dev_info.chan_info; | |
1856 | test_bus_nos[total_devices_created] = bus_no; | |
1857 | test_dev_nos[total_devices_created] = dev_no; | |
1858 | } | |
1859 | POSTCODE_LINUX_4(DEVICE_CREATE_EXIT_PC, dev_no, bus_no, | |
1860 | POSTCODE_SEVERITY_INFO); | |
1861 | rc = 0; | |
1862 | away: | |
1863 | if (rc < 0) { | |
1864 | POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, dev_no, bus_no, | |
1865 | POSTCODE_SEVERITY_ERR); | |
1866 | return; | |
1867 | } | |
1868 | devdata = (struct visorbus_devdata *)(bus_info.bus_driver_context); | |
1869 | rc = create_visor_device(devdata, bus_no, dev_no, | |
1870 | dev_info.chan_info, bus_info.partition_handle); | |
1871 | POSTCODE_LINUX_4(DEVICE_CREATE_SUCCESS_PC, dev_no, bus_no, | |
1872 | POSTCODE_SEVERITY_INFO); | |
1873 | if (rc < 0) | |
1874 | if (chipset_responders.device_create) | |
1875 | (*chipset_responders.device_create)(bus_no, dev_no, rc); | |
1876 | } | |
1877 | ||
1878 | static void | |
1879 | chipset_device_destroy(u32 bus_no, u32 dev_no) | |
1880 | { | |
1881 | struct visorchipset_device_info dev_info; | |
1882 | struct visor_device *dev; | |
1883 | int rc = -1; | |
1884 | ||
1885 | if (entered_testing_mode) | |
1886 | return; | |
1887 | if (!visorchipset_get_device_info(bus_no, dev_no, &dev_info)) | |
1888 | goto away; | |
1889 | dev = find_visor_device_by_channel(dev_info.chan_info.channel_addr); | |
1890 | if (!dev) | |
1891 | goto away; | |
1892 | rc = 0; | |
1893 | away: | |
1894 | if (rc < 0) | |
1895 | return; | |
1896 | ||
1897 | if (chipset_responders.device_destroy) | |
1898 | (*chipset_responders.device_destroy) (bus_no, dev_no, rc); | |
1899 | remove_visor_device(dev); | |
1900 | } | |
1901 | ||
1902 | /* This is the callback function specified for a function driver, to | |
1903 | * be called when a pending "pause device" operation has been | |
1904 | * completed. | |
1905 | */ | |
1906 | static void | |
1907 | pause_state_change_complete(struct visor_device *dev, int status) | |
1908 | { | |
1909 | if (!dev->pausing) | |
1910 | return; | |
1911 | ||
779d0752 | 1912 | dev->pausing = false; |
3703987c EA |
1913 | if (!chipset_responders.device_pause) /* this can never happen! */ |
1914 | return; | |
1915 | ||
1916 | /* Notify the chipset driver that the pause is complete, which | |
1917 | * will presumably want to send some sort of response to the | |
1918 | * initiator. */ | |
1919 | (*chipset_responders.device_pause) (dev->chipset_bus_no, | |
1920 | dev->chipset_dev_no, status); | |
1921 | } | |
1922 | ||
1923 | /* This is the callback function specified for a function driver, to | |
1924 | * be called when a pending "resume device" operation has been | |
1925 | * completed. | |
1926 | */ | |
1927 | static void | |
1928 | resume_state_change_complete(struct visor_device *dev, int status) | |
1929 | { | |
1930 | if (!dev->resuming) | |
1931 | return; | |
1932 | ||
779d0752 | 1933 | dev->resuming = false; |
3703987c EA |
1934 | if (!chipset_responders.device_resume) /* this can never happen! */ |
1935 | return; | |
1936 | ||
1937 | /* Notify the chipset driver that the resume is complete, | |
1938 | * which will presumably want to send some sort of response to | |
1939 | * the initiator. */ | |
1940 | (*chipset_responders.device_resume) (dev->chipset_bus_no, | |
1941 | dev->chipset_dev_no, status); | |
1942 | } | |
1943 | ||
1944 | /* Tell the subordinate function driver for a specific device to pause | |
1945 | * or resume that device. Result is returned asynchronously via a | |
1946 | * callback function. | |
1947 | */ | |
1948 | static void | |
1949 | initiate_chipset_device_pause_resume(u32 bus_no, u32 dev_no, bool is_pause) | |
1950 | { | |
1951 | struct visorchipset_device_info dev_info; | |
1952 | struct visor_device *dev = NULL; | |
1953 | int rc = -1, x; | |
1954 | struct visor_driver *drv = NULL; | |
1955 | void (*notify_func)(u32 bus_no, u32 dev_no, int response) = NULL; | |
1956 | ||
1957 | if (is_pause) | |
1958 | notify_func = chipset_responders.device_pause; | |
1959 | else | |
1960 | notify_func = chipset_responders.device_resume; | |
1961 | if (!notify_func) | |
1962 | goto away; | |
1963 | ||
1964 | if (!visorchipset_get_device_info(bus_no, dev_no, &dev_info)) | |
1965 | goto away; | |
1966 | ||
1967 | dev = find_visor_device_by_channel(dev_info.chan_info.channel_addr); | |
1968 | if (!dev) | |
1969 | goto away; | |
1970 | ||
1971 | drv = to_visor_driver(dev->device.driver); | |
1972 | if (!drv) | |
1973 | goto away; | |
1974 | ||
1975 | if (dev->pausing || dev->resuming) | |
1976 | goto away; | |
1977 | ||
1978 | /* Note that even though both drv->pause() and drv->resume | |
1979 | * specify a callback function, it is NOT necessary for us to | |
1980 | * increment our local module usage count. Reason is, there | |
1981 | * is already a linkage dependency between child function | |
1982 | * drivers and visorbus, so it is already IMPOSSIBLE to unload | |
1983 | * visorbus while child function drivers are still running. | |
1984 | */ | |
1985 | if (is_pause) { | |
1986 | if (!drv->pause) | |
1987 | goto away; | |
1988 | ||
779d0752 | 1989 | dev->pausing = true; |
3703987c EA |
1990 | x = drv->pause(dev, pause_state_change_complete); |
1991 | } else { | |
1992 | /* This should be done at BUS resume time, but an | |
1993 | * existing problem prevents us from ever getting a bus | |
1994 | * resume... This hack would fail to work should we | |
1995 | * ever have a bus that contains NO devices, since we | |
1996 | * would never even get here in that case. */ | |
1997 | fix_vbus_dev_info(dev); | |
1998 | if (!drv->resume) | |
1999 | goto away; | |
2000 | ||
779d0752 | 2001 | dev->resuming = true; |
3703987c EA |
2002 | x = drv->resume(dev, resume_state_change_complete); |
2003 | } | |
2004 | if (x < 0) { | |
2005 | if (is_pause) | |
779d0752 | 2006 | dev->pausing = false; |
3703987c | 2007 | else |
779d0752 | 2008 | dev->resuming = false; |
3703987c EA |
2009 | goto away; |
2010 | } | |
2011 | rc = 0; | |
2012 | away: | |
2013 | if (rc < 0) { | |
2014 | if (notify_func) | |
2015 | (*notify_func)(bus_no, dev_no, rc); | |
2016 | } | |
2017 | } | |
2018 | ||
2019 | static void | |
2020 | chipset_device_pause(u32 bus_no, u32 dev_no) | |
2021 | { | |
779d0752 | 2022 | initiate_chipset_device_pause_resume(bus_no, dev_no, true); |
3703987c EA |
2023 | } |
2024 | ||
2025 | static void | |
2026 | chipset_device_resume(u32 bus_no, u32 dev_no) | |
2027 | { | |
779d0752 | 2028 | initiate_chipset_device_pause_resume(bus_no, dev_no, false); |
3703987c EA |
2029 | } |
2030 | ||
2031 | struct channel_size_info { | |
2032 | uuid_le guid; | |
2033 | unsigned long min_size; | |
2034 | unsigned long max_size; | |
2035 | }; | |
2036 | ||
c79b28f7 | 2037 | int __init |
3703987c EA |
2038 | visorbus_init(void) |
2039 | { | |
2040 | int rc = 0; | |
2041 | ||
2042 | POSTCODE_LINUX_3(DRIVER_ENTRY_PC, rc, POSTCODE_SEVERITY_INFO); | |
2043 | bus_device_info_init(&clientbus_driverinfo, | |
46168810 | 2044 | "clientbus", "visorbus", |
3703987c EA |
2045 | VERSION, NULL); |
2046 | ||
2047 | /* process module options */ | |
2048 | ||
2049 | if (visorbus_devicetest > MAXDEVICETEST) | |
2050 | visorbus_devicetest = MAXDEVICETEST; | |
2051 | ||
2052 | rc = create_bus_type(); | |
2053 | if (rc < 0) { | |
2054 | POSTCODE_LINUX_2(BUS_CREATE_ENTRY_PC, DIAG_SEVERITY_ERR); | |
2055 | goto away; | |
2056 | } | |
2057 | ||
2058 | periodic_dev_workqueue = create_singlethread_workqueue("visorbus_dev"); | |
2059 | if (!periodic_dev_workqueue) { | |
2060 | POSTCODE_LINUX_2(CREATE_WORKQUEUE_PC, DIAG_SEVERITY_ERR); | |
2061 | rc = -ENOMEM; | |
2062 | goto away; | |
2063 | } | |
2064 | ||
2065 | /* This enables us to receive notifications when devices appear for | |
2066 | * which this service partition is to be a server for. | |
2067 | */ | |
4da3336c DK |
2068 | visorchipset_register_busdev(&chipset_notifiers, |
2069 | &chipset_responders, | |
2070 | &chipset_driverinfo); | |
3703987c EA |
2071 | |
2072 | rc = 0; | |
2073 | ||
2074 | away: | |
2075 | if (rc) | |
2076 | POSTCODE_LINUX_3(CHIPSET_INIT_FAILURE_PC, rc, | |
2077 | POSTCODE_SEVERITY_ERR); | |
2078 | return rc; | |
2079 | } | |
2080 | ||
c79b28f7 | 2081 | void |
3703987c EA |
2082 | visorbus_exit(void) |
2083 | { | |
2084 | struct list_head *listentry, *listtmp; | |
2085 | ||
4da3336c | 2086 | visorchipset_register_busdev(NULL, NULL, NULL); |
3703987c EA |
2087 | remove_all_visor_devices(); |
2088 | ||
2089 | flush_workqueue(periodic_dev_workqueue); /* better not be any work! */ | |
2090 | destroy_workqueue(periodic_dev_workqueue); | |
2091 | periodic_dev_workqueue = NULL; | |
2092 | ||
2093 | if (periodic_test_workqueue) { | |
2094 | cancel_delayed_work(&periodic_work); | |
2095 | flush_workqueue(periodic_test_workqueue); | |
2096 | destroy_workqueue(periodic_test_workqueue); | |
2097 | periodic_test_workqueue = NULL; | |
2098 | } | |
2099 | ||
2100 | list_for_each_safe(listentry, listtmp, &list_all_bus_instances) { | |
2101 | struct visorbus_devdata *devdata = list_entry(listentry, | |
2102 | struct | |
2103 | visorbus_devdata, | |
2104 | list_all); | |
2105 | remove_bus_instance(devdata); | |
2106 | } | |
2107 | remove_bus_type(); | |
2108 | } | |
2109 | ||
2110 | module_param_named(debug, visorbus_debug, int, S_IRUGO); | |
2111 | MODULE_PARM_DESC(visorbus_debug, "1 to debug"); | |
2112 | int visorbus_debug = 0; | |
2113 | ||
2114 | module_param_named(forcematch, visorbus_forcematch, int, S_IRUGO); | |
2115 | MODULE_PARM_DESC(visorbus_forcematch, | |
2116 | "1 to force a successful dev <--> drv match"); | |
2117 | int visorbus_forcematch = 0; | |
2118 | ||
2119 | module_param_named(forcenomatch, visorbus_forcenomatch, int, S_IRUGO); | |
2120 | MODULE_PARM_DESC(visorbus_forcenomatch, | |
2121 | "1 to force an UNsuccessful dev <--> drv match"); | |
2122 | int visorbus_forcenomatch = 0; | |
2123 | ||
2124 | module_param_named(devicetest, visorbus_devicetest, int, S_IRUGO); | |
2125 | MODULE_PARM_DESC(visorbus_devicetest, | |
2126 | "non-0 to just test device creation and destruction"); | |
2127 | int visorbus_devicetest = 0; | |
2128 | ||
2129 | module_param_named(debugref, visorbus_debugref, int, S_IRUGO); | |
2130 | MODULE_PARM_DESC(visorbus_debugref, "1 to debug reference counting"); | |
2131 | int visorbus_debugref = 0; | |
2132 | ||
3703987c EA |
2133 | MODULE_AUTHOR("Unisys"); |
2134 | MODULE_LICENSE("GPL"); | |
2135 | MODULE_DESCRIPTION("Supervisor bus driver for service partition: ver " VERSION); | |
2136 | MODULE_VERSION(VERSION); |