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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" |
3703987c EA |
23 | #include "periodic_work.h" |
24 | #include "vbuschannel.h" | |
25 | #include "guestlinuxdebug.h" | |
0f41c727 | 26 | #include "vmcallinterface.h" |
4b78000e | 27 | |
c79b28f7 PB |
28 | #define MYDRVNAME "visorbus" |
29 | ||
4b78000e | 30 | /* module parameters */ |
f6758e79 DF |
31 | static int visorbus_debug; |
32 | static int visorbus_forcematch; | |
33 | static int visorbus_forcenomatch; | |
f6758e79 | 34 | static int visorbus_debugref; |
4b78000e PB |
35 | #define SERIALLOOPBACKCHANADDR (100 * 1024 * 1024) |
36 | ||
3703987c EA |
37 | #define CURRENT_FILE_PC VISOR_BUS_PC_visorbus_main_c |
38 | #define POLLJIFFIES_TESTWORK 100 | |
39 | #define POLLJIFFIES_NORMALCHANNEL 10 | |
40 | ||
41 | static int visorbus_uevent(struct device *xdev, struct kobj_uevent_env *env); | |
42 | static int visorbus_match(struct device *xdev, struct device_driver *xdrv); | |
43 | static void fix_vbus_dev_info(struct visor_device *visordev); | |
44 | ||
68b04f1f DZ |
45 | /* BUS type attributes |
46 | * | |
47 | * define & implement display of bus attributes under | |
48 | * /sys/bus/visorbus. | |
49 | * | |
50 | */ | |
51 | ||
52 | static ssize_t version_show(struct bus_type *bus, char *buf) | |
53 | { | |
54 | return snprintf(buf, PAGE_SIZE, "%s\n", VERSION); | |
55 | } | |
56 | ||
57 | static BUS_ATTR_RO(version); | |
58 | ||
59 | static struct attribute *visorbus_bus_attrs[] = { | |
60 | &bus_attr_version.attr, | |
61 | NULL, | |
62 | }; | |
63 | ||
64 | static const struct attribute_group visorbus_bus_group = { | |
65 | .attrs = visorbus_bus_attrs, | |
66 | }; | |
67 | ||
f6758e79 | 68 | static const struct attribute_group *visorbus_bus_groups[] = { |
68b04f1f DZ |
69 | &visorbus_bus_group, |
70 | NULL, | |
71 | }; | |
72 | ||
73 | ||
3703987c EA |
74 | /** This describes the TYPE of bus. |
75 | * (Don't confuse this with an INSTANCE of the bus.) | |
76 | */ | |
1fb3016e | 77 | struct bus_type visorbus_type = { |
3703987c EA |
78 | .name = "visorbus", |
79 | .match = visorbus_match, | |
80 | .uevent = visorbus_uevent, | |
68b04f1f | 81 | .bus_groups = visorbus_bus_groups, |
3703987c EA |
82 | }; |
83 | ||
84 | static struct delayed_work periodic_work; | |
85 | ||
86 | /* YES, we need 2 workqueues. | |
87 | * The reason is, workitems on the test queue may need to cancel | |
88 | * workitems on the other queue. You will be in for trouble if you try to | |
89 | * do this with workitems queued on the same workqueue. | |
90 | */ | |
91 | static struct workqueue_struct *periodic_test_workqueue; | |
92 | static struct workqueue_struct *periodic_dev_workqueue; | |
93 | static long long bus_count; /** number of bus instances */ | |
3703987c EA |
94 | /** ever-increasing */ |
95 | ||
d32517e3 DZ |
96 | static void chipset_bus_create(struct visor_device *bus_info); |
97 | static void chipset_bus_destroy(struct visor_device *bus_info); | |
a298bc0b DZ |
98 | static void chipset_device_create(struct visor_device *dev_info); |
99 | static void chipset_device_destroy(struct visor_device *dev_info); | |
100 | static void chipset_device_pause(struct visor_device *dev_info); | |
101 | static void chipset_device_resume(struct visor_device *dev_info); | |
3703987c EA |
102 | |
103 | /** These functions are implemented herein, and are called by the chipset | |
104 | * driver to notify us about specific events. | |
105 | */ | |
106 | static struct visorchipset_busdev_notifiers chipset_notifiers = { | |
107 | .bus_create = chipset_bus_create, | |
108 | .bus_destroy = chipset_bus_destroy, | |
109 | .device_create = chipset_device_create, | |
110 | .device_destroy = chipset_device_destroy, | |
111 | .device_pause = chipset_device_pause, | |
112 | .device_resume = chipset_device_resume, | |
113 | }; | |
114 | ||
115 | /** These functions are implemented in the chipset driver, and we call them | |
116 | * herein when we want to acknowledge a specific event. | |
117 | */ | |
118 | static struct visorchipset_busdev_responders chipset_responders; | |
119 | ||
120 | /* filled in with info about parent chipset driver when we register with it */ | |
121 | static struct ultra_vbus_deviceinfo chipset_driverinfo; | |
122 | /* filled in with info about this driver, wrt it servicing client busses */ | |
123 | static struct ultra_vbus_deviceinfo clientbus_driverinfo; | |
124 | ||
343506bf | 125 | /** list of visor_device structs, linked via .list_all */ |
3703987c EA |
126 | static LIST_HEAD(list_all_bus_instances); |
127 | /** list of visor_device structs, linked via .list_all */ | |
128 | static LIST_HEAD(list_all_device_instances); | |
129 | ||
130 | static int | |
131 | visorbus_uevent(struct device *xdev, struct kobj_uevent_env *env) | |
132 | { | |
133 | if (add_uevent_var(env, "VERSION=%s", VERSION)) | |
134 | return -ENOMEM; | |
135 | return 0; | |
136 | } | |
137 | ||
138 | /* This is called automatically upon adding a visor_device (device_add), or | |
139 | * adding a visor_driver (visorbus_register_visor_driver), and returns 1 iff the | |
140 | * provided driver can control the specified device. | |
141 | */ | |
142 | static int | |
143 | visorbus_match(struct device *xdev, struct device_driver *xdrv) | |
144 | { | |
145 | uuid_le channel_type; | |
146 | int rc = 0; | |
147 | int i; | |
148 | struct visor_device *dev; | |
149 | struct visor_driver *drv; | |
150 | ||
151 | dev = to_visor_device(xdev); | |
152 | drv = to_visor_driver(xdrv); | |
153 | channel_type = visorchannel_get_uuid(dev->visorchannel); | |
154 | if (visorbus_forcematch) { | |
155 | rc = 1; | |
156 | goto away; | |
157 | } | |
158 | if (visorbus_forcenomatch) | |
159 | goto away; | |
160 | ||
161 | if (!drv->channel_types) | |
162 | goto away; | |
163 | for (i = 0; | |
164 | (uuid_le_cmp(drv->channel_types[i].guid, NULL_UUID_LE) != 0) || | |
165 | (drv->channel_types[i].name); | |
166 | i++) | |
167 | if (uuid_le_cmp(drv->channel_types[i].guid, | |
168 | channel_type) == 0) { | |
169 | rc = i + 1; | |
170 | goto away; | |
171 | } | |
172 | away: | |
173 | return rc; | |
174 | } | |
175 | ||
176 | /** This is called when device_unregister() is called for the bus device | |
177 | * instance, after all other tasks involved with destroying the device | |
178 | * are complete. | |
179 | */ | |
180 | static void | |
181 | visorbus_release_busdevice(struct device *xdev) | |
182 | { | |
343506bf | 183 | struct visor_device *dev = dev_get_drvdata(xdev); |
3703987c EA |
184 | |
185 | dev_set_drvdata(xdev, NULL); | |
343506bf | 186 | kfree(dev); |
3703987c EA |
187 | } |
188 | ||
189 | /** This is called when device_unregister() is called for each child | |
190 | * device instance. | |
191 | */ | |
192 | static void | |
193 | visorbus_release_device(struct device *xdev) | |
194 | { | |
195 | struct visor_device *dev = to_visor_device(xdev); | |
196 | ||
197 | if (dev->periodic_work) { | |
198 | visor_periodic_work_destroy(dev->periodic_work); | |
199 | dev->periodic_work = NULL; | |
200 | } | |
201 | if (dev->visorchannel) { | |
202 | visorchannel_destroy(dev->visorchannel); | |
203 | dev->visorchannel = NULL; | |
204 | } | |
205 | kfree(dev); | |
206 | } | |
207 | ||
32710457 PB |
208 | /* Implement publishing of device node attributes under: |
209 | * | |
210 | * /sys/bus/visorbus<x>/dev<y>/devmajorminor | |
211 | * | |
212 | */ | |
213 | ||
214 | #define to_devmajorminor_attr(_attr) \ | |
215 | container_of(_attr, struct devmajorminor_attribute, attr) | |
216 | #define to_visor_device_from_kobjdevmajorminor(obj) \ | |
217 | container_of(obj, struct visor_device, kobjdevmajorminor) | |
218 | ||
219 | struct devmajorminor_attribute { | |
220 | struct attribute attr; | |
221 | int slot; | |
222 | ssize_t (*show)(struct visor_device *, int slot, char *buf); | |
223 | ssize_t (*store)(struct visor_device *, int slot, const char *buf, | |
224 | size_t count); | |
225 | }; | |
226 | ||
227 | static ssize_t DEVMAJORMINOR_ATTR(struct visor_device *dev, int slot, char *buf) | |
228 | { | |
229 | int maxdevnodes = ARRAY_SIZE(dev->devnodes) / sizeof(dev->devnodes[0]); | |
230 | ||
231 | if (slot < 0 || slot >= maxdevnodes) | |
232 | return 0; | |
233 | return snprintf(buf, PAGE_SIZE, "%d:%d\n", | |
234 | dev->devnodes[slot].major, dev->devnodes[slot].minor); | |
235 | } | |
236 | ||
237 | static ssize_t | |
238 | devmajorminor_attr_show(struct kobject *kobj, struct attribute *attr, char *buf) | |
239 | { | |
240 | struct devmajorminor_attribute *devmajorminor_attr = | |
241 | to_devmajorminor_attr(attr); | |
242 | struct visor_device *dev = to_visor_device_from_kobjdevmajorminor(kobj); | |
243 | ssize_t ret = 0; | |
244 | ||
245 | if (devmajorminor_attr->show) | |
246 | ret = devmajorminor_attr->show(dev, | |
247 | devmajorminor_attr->slot, buf); | |
248 | return ret; | |
249 | } | |
250 | ||
251 | static ssize_t | |
252 | devmajorminor_attr_store(struct kobject *kobj, | |
253 | struct attribute *attr, const char *buf, size_t count) | |
254 | { | |
255 | struct devmajorminor_attribute *devmajorminor_attr = | |
256 | to_devmajorminor_attr(attr); | |
257 | struct visor_device *dev = to_visor_device_from_kobjdevmajorminor(kobj); | |
258 | ssize_t ret = 0; | |
259 | ||
260 | if (devmajorminor_attr->store) | |
261 | ret = devmajorminor_attr->store(dev, | |
262 | devmajorminor_attr->slot, | |
263 | buf, count); | |
264 | return ret; | |
265 | } | |
266 | ||
267 | static int register_devmajorminor_attributes(struct visor_device *dev); | |
268 | ||
f6758e79 | 269 | static int |
32710457 PB |
270 | devmajorminor_create_file(struct visor_device *dev, const char *name, |
271 | int major, int minor) | |
272 | { | |
273 | int maxdevnodes = ARRAY_SIZE(dev->devnodes) / sizeof(dev->devnodes[0]); | |
274 | struct devmajorminor_attribute *myattr = NULL; | |
275 | int x = -1, rc = 0, slot = -1; | |
276 | ||
277 | register_devmajorminor_attributes(dev); | |
278 | for (slot = 0; slot < maxdevnodes; slot++) | |
279 | if (!dev->devnodes[slot].attr) | |
280 | break; | |
281 | if (slot == maxdevnodes) { | |
282 | rc = -ENOMEM; | |
283 | goto away; | |
284 | } | |
285 | myattr = kmalloc(sizeof(*myattr), GFP_KERNEL); | |
286 | if (!myattr) { | |
287 | rc = -ENOMEM; | |
288 | goto away; | |
289 | } | |
290 | memset(myattr, 0, sizeof(struct devmajorminor_attribute)); | |
291 | myattr->show = DEVMAJORMINOR_ATTR; | |
292 | myattr->store = NULL; | |
293 | myattr->slot = slot; | |
294 | myattr->attr.name = name; | |
295 | myattr->attr.mode = S_IRUGO; | |
296 | dev->devnodes[slot].attr = myattr; | |
297 | dev->devnodes[slot].major = major; | |
298 | dev->devnodes[slot].minor = minor; | |
299 | x = sysfs_create_file(&dev->kobjdevmajorminor, &myattr->attr); | |
300 | if (x < 0) { | |
301 | rc = x; | |
302 | goto away; | |
303 | } | |
304 | kobject_uevent(&dev->device.kobj, KOBJ_ONLINE); | |
305 | away: | |
306 | if (rc < 0) { | |
307 | kfree(myattr); | |
308 | myattr = NULL; | |
309 | dev->devnodes[slot].attr = NULL; | |
310 | } | |
311 | return rc; | |
312 | } | |
313 | ||
f6758e79 | 314 | static void |
32710457 PB |
315 | devmajorminor_remove_file(struct visor_device *dev, int slot) |
316 | { | |
317 | int maxdevnodes = ARRAY_SIZE(dev->devnodes) / sizeof(dev->devnodes[0]); | |
318 | struct devmajorminor_attribute *myattr = NULL; | |
319 | ||
320 | if (slot < 0 || slot >= maxdevnodes) | |
321 | return; | |
322 | myattr = (struct devmajorminor_attribute *)(dev->devnodes[slot].attr); | |
323 | if (myattr) | |
324 | return; | |
325 | sysfs_remove_file(&dev->kobjdevmajorminor, &myattr->attr); | |
326 | kobject_uevent(&dev->device.kobj, KOBJ_OFFLINE); | |
327 | dev->devnodes[slot].attr = NULL; | |
328 | kfree(myattr); | |
329 | } | |
330 | ||
f6758e79 | 331 | static void |
32710457 PB |
332 | devmajorminor_remove_all_files(struct visor_device *dev) |
333 | { | |
334 | int i = 0; | |
335 | int maxdevnodes = ARRAY_SIZE(dev->devnodes) / sizeof(dev->devnodes[0]); | |
336 | ||
337 | for (i = 0; i < maxdevnodes; i++) | |
338 | devmajorminor_remove_file(dev, i); | |
339 | } | |
340 | ||
341 | static const struct sysfs_ops devmajorminor_sysfs_ops = { | |
342 | .show = devmajorminor_attr_show, | |
343 | .store = devmajorminor_attr_store, | |
344 | }; | |
345 | ||
346 | static struct kobj_type devmajorminor_kobj_type = { | |
347 | .sysfs_ops = &devmajorminor_sysfs_ops | |
348 | }; | |
349 | ||
350 | static int | |
351 | register_devmajorminor_attributes(struct visor_device *dev) | |
352 | { | |
353 | int rc = 0, x = 0; | |
354 | ||
355 | if (dev->kobjdevmajorminor.parent) | |
356 | goto away; /* already registered */ | |
357 | x = kobject_init_and_add(&dev->kobjdevmajorminor, | |
358 | &devmajorminor_kobj_type, &dev->device.kobj, | |
359 | "devmajorminor"); | |
360 | if (x < 0) { | |
361 | rc = x; | |
362 | goto away; | |
363 | } | |
364 | ||
365 | kobject_uevent(&dev->kobjdevmajorminor, KOBJ_ADD); | |
366 | ||
367 | away: | |
368 | return rc; | |
369 | } | |
370 | ||
f6758e79 | 371 | static void |
32710457 PB |
372 | unregister_devmajorminor_attributes(struct visor_device *dev) |
373 | { | |
374 | if (!dev->kobjdevmajorminor.parent) | |
375 | return; /* already unregistered */ | |
376 | devmajorminor_remove_all_files(dev); | |
377 | ||
378 | kobject_del(&dev->kobjdevmajorminor); | |
379 | kobject_put(&dev->kobjdevmajorminor); | |
380 | dev->kobjdevmajorminor.parent = NULL; | |
381 | } | |
382 | ||
826b6a0f PB |
383 | /* begin implementation of specific channel attributes to appear under |
384 | * /sys/bus/visorbus<x>/dev<y>/channel | |
385 | */ | |
79573162 DZ |
386 | static ssize_t physaddr_show(struct device *dev, struct device_attribute *attr, |
387 | char *buf) | |
826b6a0f | 388 | { |
79573162 DZ |
389 | struct visor_device *vdev = to_visor_device(dev); |
390 | ||
391 | if (!vdev->visorchannel) | |
826b6a0f PB |
392 | return 0; |
393 | return snprintf(buf, PAGE_SIZE, "0x%Lx\n", | |
79573162 | 394 | visorchannel_get_physaddr(vdev->visorchannel)); |
826b6a0f PB |
395 | } |
396 | ||
79573162 DZ |
397 | static ssize_t nbytes_show(struct device *dev, struct device_attribute *attr, |
398 | char *buf) | |
826b6a0f | 399 | { |
79573162 DZ |
400 | struct visor_device *vdev = to_visor_device(dev); |
401 | ||
402 | if (!vdev->visorchannel) | |
826b6a0f PB |
403 | return 0; |
404 | return snprintf(buf, PAGE_SIZE, "0x%lx\n", | |
79573162 | 405 | visorchannel_get_nbytes(vdev->visorchannel)); |
826b6a0f PB |
406 | } |
407 | ||
79573162 DZ |
408 | static ssize_t clientpartition_show(struct device *dev, |
409 | struct device_attribute *attr, char *buf) | |
410 | { | |
411 | struct visor_device *vdev = to_visor_device(dev); | |
412 | ||
413 | if (!vdev->visorchannel) | |
826b6a0f PB |
414 | return 0; |
415 | return snprintf(buf, PAGE_SIZE, "0x%Lx\n", | |
79573162 | 416 | visorchannel_get_clientpartition(vdev->visorchannel)); |
826b6a0f PB |
417 | } |
418 | ||
79573162 DZ |
419 | static ssize_t typeguid_show(struct device *dev, struct device_attribute *attr, |
420 | char *buf) | |
826b6a0f | 421 | { |
79573162 | 422 | struct visor_device *vdev = to_visor_device(dev); |
826b6a0f PB |
423 | char s[99]; |
424 | ||
79573162 | 425 | if (!vdev->visorchannel) |
826b6a0f PB |
426 | return 0; |
427 | return snprintf(buf, PAGE_SIZE, "%s\n", | |
79573162 | 428 | visorchannel_id(vdev->visorchannel, s)); |
826b6a0f PB |
429 | } |
430 | ||
79573162 DZ |
431 | static ssize_t zoneguid_show(struct device *dev, struct device_attribute *attr, |
432 | char *buf) | |
826b6a0f | 433 | { |
79573162 | 434 | struct visor_device *vdev = to_visor_device(dev); |
826b6a0f PB |
435 | char s[99]; |
436 | ||
79573162 | 437 | if (!vdev->visorchannel) |
826b6a0f PB |
438 | return 0; |
439 | return snprintf(buf, PAGE_SIZE, "%s\n", | |
79573162 | 440 | visorchannel_zoneid(vdev->visorchannel, s)); |
826b6a0f PB |
441 | } |
442 | ||
79573162 DZ |
443 | static ssize_t typename_show(struct device *dev, struct device_attribute *attr, |
444 | char *buf) | |
826b6a0f | 445 | { |
79573162 | 446 | struct visor_device *vdev = to_visor_device(dev); |
826b6a0f | 447 | int i = 0; |
79573162 DZ |
448 | struct bus_type *xbus = dev->bus; |
449 | struct device_driver *xdrv = dev->driver; | |
826b6a0f PB |
450 | struct visor_driver *drv = NULL; |
451 | ||
79573162 | 452 | if (!vdev->visorchannel || !xbus || !xdrv) |
826b6a0f | 453 | return 0; |
79573162 | 454 | i = xbus->match(dev, xdrv); |
826b6a0f PB |
455 | if (!i) |
456 | return 0; | |
457 | drv = to_visor_driver(xdrv); | |
458 | return snprintf(buf, PAGE_SIZE, "%s\n", drv->channel_types[i - 1].name); | |
459 | } | |
460 | ||
79573162 DZ |
461 | static DEVICE_ATTR_RO(physaddr); |
462 | static DEVICE_ATTR_RO(nbytes); | |
463 | static DEVICE_ATTR_RO(clientpartition); | |
464 | static DEVICE_ATTR_RO(typeguid); | |
465 | static DEVICE_ATTR_RO(zoneguid); | |
466 | static DEVICE_ATTR_RO(typename); | |
79573162 DZ |
467 | |
468 | static struct attribute *channel_attrs[] = { | |
469 | &dev_attr_physaddr.attr, | |
470 | &dev_attr_nbytes.attr, | |
471 | &dev_attr_clientpartition.attr, | |
472 | &dev_attr_typeguid.attr, | |
473 | &dev_attr_zoneguid.attr, | |
474 | &dev_attr_typename.attr, | |
826b6a0f PB |
475 | }; |
476 | ||
79573162 DZ |
477 | static struct attribute_group channel_attr_grp = { |
478 | .name = "channel", | |
479 | .attrs = channel_attrs, | |
826b6a0f PB |
480 | }; |
481 | ||
79573162 DZ |
482 | static const struct attribute_group *visorbus_dev_groups[] = { |
483 | &channel_attr_grp, | |
484 | NULL | |
826b6a0f PB |
485 | }; |
486 | ||
79573162 | 487 | /* end implementation of specific channel attributes */ |
826b6a0f | 488 | |
3703987c EA |
489 | /* BUS instance attributes |
490 | * | |
491 | * define & implement display of bus attributes under | |
492 | * /sys/bus/visorbus/busses/visorbus<n>. | |
493 | * | |
494 | * This is a bit hoaky because the kernel does not yet have the infrastructure | |
495 | * to separate bus INSTANCE attributes from bus TYPE attributes... | |
496 | * so we roll our own. See businst.c / businst.h. | |
497 | * | |
498 | */ | |
499 | ||
d181dd03 DZ |
500 | static ssize_t partition_handle_show(struct device *dev, |
501 | struct device_attribute *attr, | |
502 | char *buf) { | |
5ecbd5d4 DZ |
503 | struct visor_device *vdev = to_visor_device(dev); |
504 | u64 handle = visorchannel_get_clientpartition(vdev->visorchannel); | |
3703987c | 505 | |
5ecbd5d4 | 506 | return snprintf(buf, PAGE_SIZE, "0x%Lx\n", handle); |
3703987c EA |
507 | } |
508 | ||
d181dd03 DZ |
509 | static ssize_t partition_guid_show(struct device *dev, |
510 | struct device_attribute *attr, | |
511 | char *buf) { | |
5ecbd5d4 | 512 | struct visor_device *vdev = to_visor_device(dev); |
3703987c | 513 | |
5ecbd5d4 | 514 | return snprintf(buf, PAGE_SIZE, "{%pUb}\n", &vdev->partition_uuid); |
3703987c EA |
515 | } |
516 | ||
d181dd03 DZ |
517 | static ssize_t partition_name_show(struct device *dev, |
518 | struct device_attribute *attr, | |
519 | char *buf) { | |
5ecbd5d4 | 520 | struct visor_device *vdev = to_visor_device(dev); |
3703987c | 521 | |
5ecbd5d4 | 522 | return snprintf(buf, PAGE_SIZE, "%s\n", vdev->name); |
3703987c EA |
523 | } |
524 | ||
d181dd03 DZ |
525 | static ssize_t channel_addr_show(struct device *dev, |
526 | struct device_attribute *attr, | |
527 | char *buf) { | |
5ecbd5d4 DZ |
528 | struct visor_device *vdev = to_visor_device(dev); |
529 | u64 addr = visorchannel_get_physaddr(vdev->visorchannel); | |
3703987c | 530 | |
5ecbd5d4 | 531 | return snprintf(buf, PAGE_SIZE, "0x%Lx\n", addr); |
3703987c EA |
532 | } |
533 | ||
d181dd03 DZ |
534 | static ssize_t channel_bytes_show(struct device *dev, |
535 | struct device_attribute *attr, | |
536 | char *buf) { | |
5ecbd5d4 DZ |
537 | struct visor_device *vdev = to_visor_device(dev); |
538 | u64 nbytes = visorchannel_get_nbytes(vdev->visorchannel); | |
3703987c | 539 | |
5ecbd5d4 | 540 | return snprintf(buf, PAGE_SIZE, "0x%Lx\n", nbytes); |
3703987c EA |
541 | } |
542 | ||
d181dd03 DZ |
543 | static ssize_t channel_id_show(struct device *dev, |
544 | struct device_attribute *attr, | |
545 | char *buf) { | |
5ecbd5d4 | 546 | struct visor_device *vdev = to_visor_device(dev); |
3703987c EA |
547 | int len = 0; |
548 | ||
5ecbd5d4 DZ |
549 | if (vdev->visorchannel) { |
550 | visorchannel_id(vdev->visorchannel, buf); | |
3703987c EA |
551 | len = strlen(buf); |
552 | buf[len++] = '\n'; | |
553 | } | |
554 | return len; | |
555 | } | |
556 | ||
d181dd03 DZ |
557 | static ssize_t client_bus_info_show(struct device *dev, |
558 | struct device_attribute *attr, | |
559 | char *buf) { | |
5ecbd5d4 DZ |
560 | struct visor_device *vdev = to_visor_device(dev); |
561 | struct visorchannel *channel = vdev->visorchannel; | |
562 | ||
3703987c EA |
563 | int i, x, remain = PAGE_SIZE; |
564 | unsigned long off; | |
565 | char *p = buf; | |
566 | u8 *partition_name; | |
567 | struct ultra_vbus_deviceinfo dev_info; | |
568 | ||
569 | partition_name = ""; | |
5ecbd5d4 DZ |
570 | if (channel) { |
571 | if (vdev->name) | |
572 | partition_name = vdev->name; | |
3703987c | 573 | x = snprintf(p, remain, |
65bd6e46 | 574 | "Client device / client driver info for %s partition (vbus #%d):\n", |
5ecbd5d4 | 575 | partition_name, vdev->chipset_dev_no); |
3703987c EA |
576 | p += x; |
577 | remain -= x; | |
5ecbd5d4 | 578 | x = visorchannel_read(channel, |
3703987c EA |
579 | offsetof(struct |
580 | spar_vbus_channel_protocol, | |
581 | chp_info), | |
582 | &dev_info, sizeof(dev_info)); | |
583 | if (x >= 0) { | |
584 | x = vbuschannel_devinfo_to_string(&dev_info, p, | |
585 | remain, -1); | |
586 | p += x; | |
587 | remain -= x; | |
588 | } | |
5ecbd5d4 | 589 | x = visorchannel_read(channel, |
3703987c EA |
590 | offsetof(struct |
591 | spar_vbus_channel_protocol, | |
592 | bus_info), | |
593 | &dev_info, sizeof(dev_info)); | |
594 | if (x >= 0) { | |
595 | x = vbuschannel_devinfo_to_string(&dev_info, p, | |
596 | remain, -1); | |
597 | p += x; | |
598 | remain -= x; | |
599 | } | |
600 | off = offsetof(struct spar_vbus_channel_protocol, dev_info); | |
601 | i = 0; | |
602 | while (off + sizeof(dev_info) <= | |
5ecbd5d4 DZ |
603 | visorchannel_get_nbytes(channel)) { |
604 | x = visorchannel_read(channel, | |
3703987c EA |
605 | off, &dev_info, sizeof(dev_info)); |
606 | if (x >= 0) { | |
607 | x = vbuschannel_devinfo_to_string | |
608 | (&dev_info, p, remain, i); | |
609 | p += x; | |
610 | remain -= x; | |
611 | } | |
612 | off += sizeof(dev_info); | |
613 | i++; | |
614 | } | |
615 | } | |
616 | return PAGE_SIZE - remain; | |
617 | } | |
618 | ||
d181dd03 DZ |
619 | static DEVICE_ATTR_RO(partition_handle); |
620 | static DEVICE_ATTR_RO(partition_guid); | |
621 | static DEVICE_ATTR_RO(partition_name); | |
622 | static DEVICE_ATTR_RO(channel_addr); | |
623 | static DEVICE_ATTR_RO(channel_bytes); | |
624 | static DEVICE_ATTR_RO(channel_id); | |
625 | static DEVICE_ATTR_RO(client_bus_info); | |
626 | ||
627 | static struct attribute *dev_attrs[] = { | |
628 | &dev_attr_partition_handle.attr, | |
629 | &dev_attr_partition_guid.attr, | |
630 | &dev_attr_partition_name.attr, | |
631 | &dev_attr_channel_addr.attr, | |
632 | &dev_attr_channel_bytes.attr, | |
633 | &dev_attr_channel_id.attr, | |
634 | &dev_attr_client_bus_info.attr, | |
635 | NULL | |
636 | }; | |
3703987c | 637 | |
d181dd03 DZ |
638 | static struct attribute_group dev_attr_grp = { |
639 | .attrs = dev_attrs, | |
640 | }; | |
3703987c | 641 | |
d181dd03 DZ |
642 | static const struct attribute_group *visorbus_groups[] = { |
643 | &dev_attr_grp, | |
644 | NULL | |
645 | }; | |
3703987c EA |
646 | |
647 | /* DRIVER attributes | |
648 | * | |
649 | * define & implement display of driver attributes under | |
650 | * /sys/bus/visorbus/drivers/<drivername>. | |
651 | * | |
652 | */ | |
653 | ||
654 | static ssize_t | |
655 | DRIVER_ATTR_version(struct device_driver *xdrv, char *buf) | |
656 | { | |
657 | struct visor_driver *drv = to_visor_driver(xdrv); | |
658 | ||
659 | return snprintf(buf, PAGE_SIZE, "%s\n", drv->version); | |
660 | } | |
661 | ||
662 | static int | |
663 | register_driver_attributes(struct visor_driver *drv) | |
664 | { | |
665 | int rc; | |
666 | struct driver_attribute version = | |
667 | __ATTR(version, S_IRUGO, DRIVER_ATTR_version, NULL); | |
668 | drv->version_attr = version; | |
669 | rc = driver_create_file(&drv->driver, &drv->version_attr); | |
670 | return rc; | |
671 | } | |
672 | ||
673 | static void | |
674 | unregister_driver_attributes(struct visor_driver *drv) | |
675 | { | |
676 | driver_remove_file(&drv->driver, &drv->version_attr); | |
677 | } | |
678 | ||
3703987c EA |
679 | static void |
680 | dev_periodic_work(void *xdev) | |
681 | { | |
682 | struct visor_device *dev = (struct visor_device *)xdev; | |
683 | struct visor_driver *drv = to_visor_driver(dev->device.driver); | |
684 | ||
685 | down(&dev->visordriver_callback_lock); | |
686 | if (drv->channel_interrupt) | |
687 | drv->channel_interrupt(dev); | |
688 | up(&dev->visordriver_callback_lock); | |
689 | if (!visor_periodic_work_nextperiod(dev->periodic_work)) | |
690 | put_device(&dev->device); | |
691 | } | |
692 | ||
693 | static void | |
694 | dev_start_periodic_work(struct visor_device *dev) | |
695 | { | |
696 | if (dev->being_removed) | |
697 | return; | |
698 | /* now up by at least 2 */ | |
699 | get_device(&dev->device); | |
700 | if (!visor_periodic_work_start(dev->periodic_work)) | |
701 | put_device(&dev->device); | |
702 | } | |
703 | ||
704 | static void | |
705 | dev_stop_periodic_work(struct visor_device *dev) | |
706 | { | |
707 | if (visor_periodic_work_stop(dev->periodic_work)) | |
708 | put_device(&dev->device); | |
709 | } | |
710 | ||
711 | /** This is called automatically upon adding a visor_device (device_add), or | |
712 | * adding a visor_driver (visorbus_register_visor_driver), but only after | |
713 | * visorbus_match has returned 1 to indicate a successful match between | |
714 | * driver and device. | |
715 | */ | |
716 | static int | |
717 | visordriver_probe_device(struct device *xdev) | |
718 | { | |
719 | int rc; | |
720 | struct visor_driver *drv; | |
721 | struct visor_device *dev; | |
722 | ||
723 | drv = to_visor_driver(xdev->driver); | |
724 | dev = to_visor_device(xdev); | |
725 | down(&dev->visordriver_callback_lock); | |
779d0752 | 726 | dev->being_removed = false; |
3703987c EA |
727 | /* |
728 | * ensure that the dev->being_removed flag is cleared before | |
729 | * we start the probe | |
730 | */ | |
731 | wmb(); | |
732 | get_device(&dev->device); | |
733 | if (!drv->probe) { | |
734 | up(&dev->visordriver_callback_lock); | |
735 | rc = -1; | |
736 | goto away; | |
737 | } | |
738 | rc = drv->probe(dev); | |
739 | if (rc < 0) | |
740 | goto away; | |
741 | ||
742 | fix_vbus_dev_info(dev); | |
743 | up(&dev->visordriver_callback_lock); | |
744 | rc = 0; | |
745 | away: | |
746 | if (rc != 0) | |
747 | put_device(&dev->device); | |
748 | /* We could get here more than once if the child driver module is | |
749 | * unloaded and re-loaded while devices are present. That's why we | |
750 | * need a flag to be sure that we only respond to the device_create | |
751 | * once. We cannot respond to the device_create prior to here, | |
752 | * because until we call drv->probe() above, the channel has not been | |
753 | * initialized. | |
754 | */ | |
755 | if (!dev->responded_to_device_create) { | |
b4b598fd | 756 | |
779d0752 | 757 | dev->responded_to_device_create = true; |
3703987c | 758 | if (chipset_responders.device_create) |
a298bc0b | 759 | (*chipset_responders.device_create)(dev, rc); |
3703987c EA |
760 | } |
761 | return rc; | |
762 | } | |
763 | ||
764 | /** This is called when device_unregister() is called for each child device | |
765 | * instance, to notify the appropriate visorbus_driver that the device is | |
766 | * going away, and to decrease the reference count of the device. | |
767 | */ | |
768 | static int | |
769 | visordriver_remove_device(struct device *xdev) | |
770 | { | |
771 | int rc = 0; | |
772 | struct visor_device *dev; | |
773 | struct visor_driver *drv; | |
774 | ||
775 | dev = to_visor_device(xdev); | |
776 | drv = to_visor_driver(xdev->driver); | |
777 | down(&dev->visordriver_callback_lock); | |
779d0752 | 778 | dev->being_removed = true; |
3703987c EA |
779 | /* |
780 | * ensure that the dev->being_removed flag is set before we start the | |
781 | * actual removal | |
782 | */ | |
783 | wmb(); | |
784 | if (drv) { | |
785 | if (drv->remove) | |
786 | drv->remove(dev); | |
787 | } | |
788 | up(&dev->visordriver_callback_lock); | |
789 | dev_stop_periodic_work(dev); | |
790 | devmajorminor_remove_all_files(dev); | |
791 | ||
792 | put_device(&dev->device); | |
793 | ||
794 | return rc; | |
795 | } | |
796 | ||
797 | /** A particular type of visor driver calls this function to register | |
798 | * the driver. The caller MUST fill in the following fields within the | |
799 | * #drv structure: | |
800 | * name, version, owner, channel_types, probe, remove | |
801 | * | |
802 | * Here's how the whole Linux bus / driver / device model works. | |
803 | * | |
804 | * At system start-up, the visorbus kernel module is loaded, which registers | |
805 | * visorbus_type as a bus type, using bus_register(). | |
806 | * | |
807 | * All kernel modules that support particular device types on a | |
808 | * visorbus bus are loaded. Each of these kernel modules calls | |
809 | * visorbus_register_visor_driver() in their init functions, passing a | |
810 | * visor_driver struct. visorbus_register_visor_driver() in turn calls | |
811 | * register_driver(&visor_driver.driver). This .driver member is | |
812 | * initialized with generic methods (like probe), whose sole responsibility | |
813 | * is to act as a broker for the real methods, which are within the | |
814 | * visor_driver struct. (This is the way the subclass behavior is | |
815 | * implemented, since visor_driver is essentially a subclass of the | |
816 | * generic driver.) Whenever a driver_register() happens, core bus code in | |
817 | * the kernel does (see device_attach() in drivers/base/dd.c): | |
818 | * | |
819 | * for each dev associated with the bus (the bus that driver is on) that | |
820 | * does not yet have a driver | |
821 | * if bus.match(dev,newdriver) == yes_matched ** .match specified | |
822 | * ** during bus_register(). | |
823 | * newdriver.probe(dev) ** for visor drivers, this will call | |
824 | * ** the generic driver.probe implemented in visorbus.c, | |
825 | * ** which in turn calls the probe specified within the | |
826 | * ** struct visor_driver (which was specified by the | |
827 | * ** actual device driver as part of | |
828 | * ** visorbus_register_visor_driver()). | |
829 | * | |
830 | * The above dance also happens when a new device appears. | |
831 | * So the question is, how are devices created within the system? | |
832 | * Basically, just call device_add(dev). See pci_bus_add_devices(). | |
833 | * pci_scan_device() shows an example of how to build a device struct. It | |
834 | * returns the newly-created struct to pci_scan_single_device(), who adds it | |
835 | * to the list of devices at PCIBUS.devices. That list of devices is what | |
836 | * is traversed by pci_bus_add_devices(). | |
837 | * | |
838 | */ | |
839 | int visorbus_register_visor_driver(struct visor_driver *drv) | |
840 | { | |
841 | int rc = 0; | |
842 | ||
843 | drv->driver.name = drv->name; | |
844 | drv->driver.bus = &visorbus_type; | |
845 | drv->driver.probe = visordriver_probe_device; | |
846 | drv->driver.remove = visordriver_remove_device; | |
847 | drv->driver.owner = drv->owner; | |
848 | ||
849 | /* driver_register does this: | |
850 | * bus_add_driver(drv) | |
851 | * ->if (drv.bus) ** (bus_type) ** | |
852 | * driver_attach(drv) | |
853 | * for each dev with bus type of drv.bus | |
854 | * if (!dev.drv) ** no driver assigned yet ** | |
855 | * if (bus.match(dev,drv)) [visorbus_match] | |
856 | * dev.drv = drv | |
857 | * if (!drv.probe(dev)) [visordriver_probe_device] | |
858 | * dev.drv = NULL | |
859 | */ | |
860 | ||
861 | rc = driver_register(&drv->driver); | |
862 | if (rc < 0) | |
863 | return rc; | |
864 | rc = register_driver_attributes(drv); | |
865 | return rc; | |
866 | } | |
867 | EXPORT_SYMBOL_GPL(visorbus_register_visor_driver); | |
868 | ||
869 | /** A particular type of visor driver calls this function to unregister | |
870 | * the driver, i.e., within its module_exit function. | |
871 | */ | |
872 | void | |
873 | visorbus_unregister_visor_driver(struct visor_driver *drv) | |
874 | { | |
875 | unregister_driver_attributes(drv); | |
876 | driver_unregister(&drv->driver); | |
877 | } | |
878 | EXPORT_SYMBOL_GPL(visorbus_unregister_visor_driver); | |
879 | ||
880 | int | |
881 | visorbus_read_channel(struct visor_device *dev, unsigned long offset, | |
882 | void *dest, unsigned long nbytes) | |
883 | { | |
884 | return visorchannel_read(dev->visorchannel, offset, dest, nbytes); | |
885 | } | |
886 | EXPORT_SYMBOL_GPL(visorbus_read_channel); | |
887 | ||
888 | int | |
889 | visorbus_write_channel(struct visor_device *dev, unsigned long offset, | |
890 | void *src, unsigned long nbytes) | |
891 | { | |
892 | return visorchannel_write(dev->visorchannel, offset, src, nbytes); | |
893 | } | |
894 | EXPORT_SYMBOL_GPL(visorbus_write_channel); | |
895 | ||
896 | int | |
897 | visorbus_clear_channel(struct visor_device *dev, unsigned long offset, u8 ch, | |
898 | unsigned long nbytes) | |
899 | { | |
900 | return visorchannel_clear(dev->visorchannel, offset, ch, nbytes); | |
901 | } | |
902 | EXPORT_SYMBOL_GPL(visorbus_clear_channel); | |
903 | ||
904 | int | |
905 | visorbus_registerdevnode(struct visor_device *dev, | |
906 | const char *name, int major, int minor) | |
907 | { | |
908 | return devmajorminor_create_file(dev, name, major, minor); | |
909 | } | |
910 | EXPORT_SYMBOL_GPL(visorbus_registerdevnode); | |
911 | ||
912 | /** We don't really have a real interrupt, so for now we just call the | |
913 | * interrupt function periodically... | |
914 | */ | |
915 | void | |
916 | visorbus_enable_channel_interrupts(struct visor_device *dev) | |
917 | { | |
918 | dev_start_periodic_work(dev); | |
919 | } | |
920 | EXPORT_SYMBOL_GPL(visorbus_enable_channel_interrupts); | |
921 | ||
922 | void | |
923 | visorbus_disable_channel_interrupts(struct visor_device *dev) | |
924 | { | |
925 | dev_stop_periodic_work(dev); | |
926 | } | |
927 | EXPORT_SYMBOL_GPL(visorbus_disable_channel_interrupts); | |
928 | ||
929 | /** This is how everything starts from the device end. | |
930 | * This function is called when a channel first appears via a ControlVM | |
931 | * message. In response, this function allocates a visor_device to | |
932 | * correspond to the new channel, and attempts to connect it the appropriate | |
933 | * driver. If the appropriate driver is found, the visor_driver.probe() | |
934 | * function for that driver will be called, and will be passed the new | |
935 | * visor_device that we just created. | |
936 | * | |
937 | * It's ok if the appropriate driver is not yet loaded, because in that case | |
938 | * the new device struct will just stick around in the bus' list of devices. | |
939 | * When the appropriate driver calls visorbus_register_visor_driver(), the | |
940 | * visor_driver.probe() for the new driver will be called with the new | |
941 | * device. | |
942 | */ | |
943 | static int | |
a298bc0b | 944 | create_visor_device(struct visor_device *dev) |
3703987c EA |
945 | { |
946 | int rc = -1; | |
a298bc0b DZ |
947 | u32 chipset_bus_no = dev->chipset_bus_no; |
948 | u32 chipset_dev_no = dev->chipset_dev_no; | |
3703987c EA |
949 | |
950 | POSTCODE_LINUX_4(DEVICE_CREATE_ENTRY_PC, chipset_dev_no, chipset_bus_no, | |
951 | POSTCODE_SEVERITY_INFO); | |
3703987c | 952 | |
3703987c EA |
953 | sema_init(&dev->visordriver_callback_lock, 1); /* unlocked */ |
954 | dev->device.bus = &visorbus_type; | |
79573162 | 955 | dev->device.groups = visorbus_dev_groups; |
3703987c EA |
956 | device_initialize(&dev->device); |
957 | dev->device.release = visorbus_release_device; | |
958 | /* keep a reference just for us (now 2) */ | |
959 | get_device(&dev->device); | |
3703987c EA |
960 | dev->periodic_work = |
961 | visor_periodic_work_create(POLLJIFFIES_NORMALCHANNEL, | |
962 | periodic_dev_workqueue, | |
963 | dev_periodic_work, | |
964 | dev, dev_name(&dev->device)); | |
965 | if (!dev->periodic_work) { | |
966 | POSTCODE_LINUX_3(DEVICE_CREATE_FAILURE_PC, chipset_dev_no, | |
967 | DIAG_SEVERITY_ERR); | |
968 | goto away; | |
969 | } | |
970 | ||
971 | /* bus_id must be a unique name with respect to this bus TYPE | |
972 | * (NOT bus instance). That's why we need to include the bus | |
973 | * number within the name. | |
974 | */ | |
b4b598fd | 975 | dev_set_name(&dev->device, "vbus%u:dev%u", |
3703987c EA |
976 | chipset_bus_no, chipset_dev_no); |
977 | ||
978 | /* device_add does this: | |
979 | * bus_add_device(dev) | |
980 | * ->device_attach(dev) | |
981 | * ->for each driver drv registered on the bus that dev is on | |
982 | * if (dev.drv) ** device already has a driver ** | |
983 | * ** not sure we could ever get here... ** | |
984 | * else | |
985 | * if (bus.match(dev,drv)) [visorbus_match] | |
986 | * dev.drv = drv | |
987 | * if (!drv.probe(dev)) [visordriver_probe_device] | |
988 | * dev.drv = NULL | |
989 | * | |
990 | * Note that device_add does NOT fail if no driver failed to | |
991 | * claim the device. The device will be linked onto | |
992 | * bus_type.klist_devices regardless (use bus_for_each_dev). | |
993 | */ | |
994 | rc = device_add(&dev->device); | |
995 | if (rc < 0) { | |
996 | POSTCODE_LINUX_3(DEVICE_ADD_PC, chipset_bus_no, | |
997 | DIAG_SEVERITY_ERR); | |
998 | goto away; | |
999 | } | |
1000 | ||
3703987c EA |
1001 | rc = register_devmajorminor_attributes(dev); |
1002 | if (rc < 0) { | |
1003 | POSTCODE_LINUX_3(DEVICE_REGISTER_FAILURE_PC, chipset_dev_no, | |
1004 | DIAG_SEVERITY_ERR); | |
a298bc0b | 1005 | goto away_register; |
3703987c EA |
1006 | } |
1007 | ||
a298bc0b DZ |
1008 | list_add_tail(&dev->list_all, &list_all_device_instances); |
1009 | return 0; | |
3703987c | 1010 | |
a298bc0b DZ |
1011 | away_register: |
1012 | device_unregister(&dev->device); | |
3703987c | 1013 | away: |
a298bc0b | 1014 | put_device(&dev->device); |
3703987c EA |
1015 | return rc; |
1016 | } | |
1017 | ||
1018 | static void | |
1019 | remove_visor_device(struct visor_device *dev) | |
1020 | { | |
1021 | list_del(&dev->list_all); | |
1022 | unregister_devmajorminor_attributes(dev); | |
3703987c EA |
1023 | put_device(&dev->device); |
1024 | device_unregister(&dev->device); | |
1025 | } | |
1026 | ||
3703987c EA |
1027 | static int |
1028 | get_vbus_header_info(struct visorchannel *chan, | |
1029 | struct spar_vbus_headerinfo *hdr_info) | |
1030 | { | |
1031 | int rc = -1; | |
1032 | ||
1033 | if (!SPAR_VBUS_CHANNEL_OK_CLIENT(visorchannel_get_header(chan))) | |
1034 | goto away; | |
1035 | if (visorchannel_read(chan, sizeof(struct channel_header), hdr_info, | |
1036 | sizeof(*hdr_info)) < 0) { | |
1037 | goto away; | |
1038 | } | |
1039 | if (hdr_info->struct_bytes < sizeof(struct spar_vbus_headerinfo)) | |
1040 | goto away; | |
1041 | if (hdr_info->device_info_struct_bytes < | |
1042 | sizeof(struct ultra_vbus_deviceinfo)) { | |
1043 | goto away; | |
1044 | } | |
1045 | rc = 0; | |
1046 | away: | |
1047 | return rc; | |
1048 | } | |
1049 | ||
1050 | /* Write the contents of <info> to the struct | |
1051 | * spar_vbus_channel_protocol.chp_info. */ | |
1052 | ||
1053 | static int | |
1054 | write_vbus_chp_info(struct visorchannel *chan, | |
1055 | struct spar_vbus_headerinfo *hdr_info, | |
1056 | struct ultra_vbus_deviceinfo *info) | |
1057 | { | |
1058 | int off = sizeof(struct channel_header) + hdr_info->chp_info_offset; | |
1059 | ||
1060 | if (hdr_info->chp_info_offset == 0) | |
1061 | return -1; | |
1062 | ||
1063 | if (visorchannel_write(chan, off, info, sizeof(*info)) < 0) | |
1064 | return -1; | |
1065 | return 0; | |
1066 | } | |
1067 | ||
1068 | /* Write the contents of <info> to the struct | |
1069 | * spar_vbus_channel_protocol.bus_info. */ | |
1070 | ||
1071 | static int | |
1072 | write_vbus_bus_info(struct visorchannel *chan, | |
1073 | struct spar_vbus_headerinfo *hdr_info, | |
1074 | struct ultra_vbus_deviceinfo *info) | |
1075 | { | |
1076 | int off = sizeof(struct channel_header) + hdr_info->bus_info_offset; | |
1077 | ||
1078 | if (hdr_info->bus_info_offset == 0) | |
1079 | return -1; | |
1080 | ||
1081 | if (visorchannel_write(chan, off, info, sizeof(*info)) < 0) | |
1082 | return -1; | |
1083 | return 0; | |
1084 | } | |
1085 | ||
1086 | /* Write the contents of <info> to the | |
1087 | * struct spar_vbus_channel_protocol.dev_info[<devix>]. | |
1088 | */ | |
1089 | static int | |
1090 | write_vbus_dev_info(struct visorchannel *chan, | |
1091 | struct spar_vbus_headerinfo *hdr_info, | |
1092 | struct ultra_vbus_deviceinfo *info, int devix) | |
1093 | { | |
1094 | int off = | |
1095 | (sizeof(struct channel_header) + hdr_info->dev_info_offset) + | |
1096 | (hdr_info->device_info_struct_bytes * devix); | |
1097 | ||
1098 | if (hdr_info->dev_info_offset == 0) | |
1099 | return -1; | |
1100 | ||
1101 | if (visorchannel_write(chan, off, info, sizeof(*info)) < 0) | |
1102 | return -1; | |
1103 | return 0; | |
1104 | } | |
1105 | ||
1106 | /* For a child device just created on a client bus, fill in | |
1107 | * information about the driver that is controlling this device into | |
1108 | * the the appropriate slot within the vbus channel of the bus | |
1109 | * instance. | |
1110 | */ | |
1111 | static void | |
1112 | fix_vbus_dev_info(struct visor_device *visordev) | |
1113 | { | |
1114 | int i; | |
d32517e3 | 1115 | struct visor_device *bdev; |
3703987c EA |
1116 | struct visor_driver *visordrv; |
1117 | int bus_no = visordev->chipset_bus_no; | |
1118 | int dev_no = visordev->chipset_dev_no; | |
1119 | struct ultra_vbus_deviceinfo dev_info; | |
1120 | const char *chan_type_name = NULL; | |
7726f813 | 1121 | struct spar_vbus_headerinfo *hdr_info; |
3703987c EA |
1122 | |
1123 | if (!visordev->device.driver) | |
1124 | return; | |
1125 | ||
7726f813 | 1126 | hdr_info = (struct spar_vbus_headerinfo *)visordev->vbus_hdr_info; |
d32517e3 DZ |
1127 | if (!hdr_info) |
1128 | return; | |
7726f813 | 1129 | |
d32517e3 DZ |
1130 | bdev = visorbus_get_device_by_id(bus_no, BUS_ROOT_DEVICE, NULL); |
1131 | if (!bdev) | |
1132 | return; | |
3703987c | 1133 | |
d32517e3 | 1134 | visordrv = to_visor_driver(visordev->device.driver); |
3703987c EA |
1135 | |
1136 | /* Within the list of device types (by GUID) that the driver | |
1137 | * says it supports, find out which one of those types matches | |
1138 | * the type of this device, so that we can include the device | |
1139 | * type name | |
1140 | */ | |
1141 | for (i = 0; visordrv->channel_types[i].name; i++) { | |
d5b3f1dc EA |
1142 | if (memcmp(&visordrv->channel_types[i].guid, |
1143 | &visordev->channel_type_guid, | |
1144 | sizeof(visordrv->channel_types[i].guid)) == 0) { | |
3703987c EA |
1145 | chan_type_name = visordrv->channel_types[i].name; |
1146 | break; | |
1147 | } | |
1148 | } | |
1149 | ||
1150 | bus_device_info_init(&dev_info, chan_type_name, | |
1151 | visordrv->name, visordrv->version, | |
1152 | visordrv->vertag); | |
d32517e3 | 1153 | write_vbus_dev_info(bdev->visorchannel, hdr_info, &dev_info, dev_no); |
3703987c EA |
1154 | |
1155 | /* Re-write bus+chipset info, because it is possible that this | |
1156 | * was previously written by our evil counterpart, virtpci. | |
1157 | */ | |
d32517e3 DZ |
1158 | write_vbus_chp_info(bdev->visorchannel, hdr_info, &chipset_driverinfo); |
1159 | write_vbus_bus_info(bdev->visorchannel, hdr_info, | |
1160 | &clientbus_driverinfo); | |
3703987c EA |
1161 | } |
1162 | ||
1163 | /** Create a device instance for the visor bus itself. | |
1164 | */ | |
d32517e3 DZ |
1165 | static int |
1166 | create_bus_instance(struct visor_device *dev) | |
3703987c | 1167 | { |
d32517e3 DZ |
1168 | int rc; |
1169 | int id = dev->chipset_bus_no; | |
7726f813 | 1170 | struct spar_vbus_headerinfo *hdr_info; |
3703987c EA |
1171 | |
1172 | POSTCODE_LINUX_2(BUS_CREATE_ENTRY_PC, POSTCODE_SEVERITY_INFO); | |
7726f813 DZ |
1173 | |
1174 | hdr_info = kzalloc(sizeof(*hdr_info), GFP_KERNEL); | |
1175 | if (!hdr_info) { | |
d32517e3 DZ |
1176 | rc = -1; |
1177 | goto away; | |
7726f813 DZ |
1178 | } |
1179 | ||
343506bf DZ |
1180 | dev_set_name(&dev->device, "visorbus%d", id); |
1181 | dev->device.bus = &visorbus_type; | |
1182 | dev->device.groups = visorbus_groups; | |
1183 | dev->device.release = visorbus_release_busdevice; | |
d32517e3 | 1184 | |
343506bf | 1185 | if (device_register(&dev->device) < 0) { |
3703987c EA |
1186 | POSTCODE_LINUX_3(DEVICE_CREATE_FAILURE_PC, id, |
1187 | POSTCODE_SEVERITY_ERR); | |
d32517e3 DZ |
1188 | rc = -1; |
1189 | goto away_mem; | |
3703987c | 1190 | } |
d32517e3 | 1191 | |
ee983d90 DZ |
1192 | if (get_vbus_header_info(dev->visorchannel, hdr_info) >= 0) { |
1193 | dev->vbus_hdr_info = (void *)hdr_info; | |
1194 | write_vbus_chp_info(dev->visorchannel, hdr_info, | |
1195 | &chipset_driverinfo); | |
1196 | write_vbus_bus_info(dev->visorchannel, hdr_info, | |
1197 | &clientbus_driverinfo); | |
b32c4997 | 1198 | } else { |
ee983d90 | 1199 | kfree(hdr_info); |
3703987c | 1200 | } |
3703987c | 1201 | bus_count++; |
343506bf | 1202 | list_add_tail(&dev->list_all, &list_all_bus_instances); |
343506bf | 1203 | dev_set_drvdata(&dev->device, dev); |
d32517e3 | 1204 | return 0; |
7726f813 | 1205 | |
7726f813 | 1206 | away_mem: |
d32517e3 | 1207 | kfree(hdr_info); |
3703987c EA |
1208 | away: |
1209 | return rc; | |
1210 | } | |
1211 | ||
1212 | /** Remove a device instance for the visor bus itself. | |
1213 | */ | |
1214 | static void | |
343506bf | 1215 | remove_bus_instance(struct visor_device *dev) |
3703987c EA |
1216 | { |
1217 | /* Note that this will result in the release method for | |
343506bf | 1218 | * dev->dev being called, which will call |
3703987c EA |
1219 | * visorbus_release_busdevice(). This has something to do with |
1220 | * the put_device() done in device_unregister(), but I have never | |
1221 | * successfully been able to trace thru the code to see where/how | |
1222 | * release() gets called. But I know it does. | |
1223 | */ | |
3703987c | 1224 | bus_count--; |
343506bf DZ |
1225 | if (dev->visorchannel) { |
1226 | visorchannel_destroy(dev->visorchannel); | |
1227 | dev->visorchannel = NULL; | |
3703987c | 1228 | } |
343506bf DZ |
1229 | kfree(dev->vbus_hdr_info); |
1230 | list_del(&dev->list_all); | |
1231 | device_unregister(&dev->device); | |
3703987c EA |
1232 | } |
1233 | ||
1234 | /** Create and register the one-and-only one instance of | |
1235 | * the visor bus type (visorbus_type). | |
1236 | */ | |
1237 | static int | |
1238 | create_bus_type(void) | |
1239 | { | |
1240 | int rc = 0; | |
1241 | ||
3703987c | 1242 | rc = bus_register(&visorbus_type); |
3703987c EA |
1243 | return rc; |
1244 | } | |
1245 | ||
1246 | /** Remove the one-and-only one instance of the visor bus type (visorbus_type). | |
1247 | */ | |
1248 | static void | |
1249 | remove_bus_type(void) | |
1250 | { | |
3703987c EA |
1251 | bus_unregister(&visorbus_type); |
1252 | } | |
1253 | ||
1254 | /** Remove all child visor bus device instances. | |
1255 | */ | |
1256 | static void | |
1257 | remove_all_visor_devices(void) | |
1258 | { | |
1259 | struct list_head *listentry, *listtmp; | |
1260 | ||
1261 | list_for_each_safe(listentry, listtmp, &list_all_device_instances) { | |
1262 | struct visor_device *dev = list_entry(listentry, | |
1263 | struct visor_device, | |
1264 | list_all); | |
1265 | remove_visor_device(dev); | |
1266 | } | |
1267 | } | |
1268 | ||
3703987c | 1269 | static void |
d32517e3 | 1270 | chipset_bus_create(struct visor_device *dev) |
3703987c | 1271 | { |
d32517e3 DZ |
1272 | int rc; |
1273 | u32 bus_no = dev->chipset_bus_no; | |
3703987c EA |
1274 | |
1275 | POSTCODE_LINUX_3(BUS_CREATE_ENTRY_PC, bus_no, POSTCODE_SEVERITY_INFO); | |
d32517e3 | 1276 | rc = create_bus_instance(dev); |
3703987c | 1277 | POSTCODE_LINUX_3(BUS_CREATE_EXIT_PC, bus_no, POSTCODE_SEVERITY_INFO); |
d32517e3 DZ |
1278 | |
1279 | if (rc < 0) | |
3703987c EA |
1280 | POSTCODE_LINUX_3(BUS_CREATE_FAILURE_PC, bus_no, |
1281 | POSTCODE_SEVERITY_ERR); | |
d32517e3 DZ |
1282 | else |
1283 | POSTCODE_LINUX_3(CHIPSET_INIT_SUCCESS_PC, bus_no, | |
1284 | POSTCODE_SEVERITY_INFO); | |
1285 | ||
3703987c | 1286 | if (chipset_responders.bus_create) |
d32517e3 | 1287 | (*chipset_responders.bus_create) (dev, rc); |
3703987c EA |
1288 | } |
1289 | ||
1290 | static void | |
d32517e3 | 1291 | chipset_bus_destroy(struct visor_device *dev) |
3703987c | 1292 | { |
343506bf | 1293 | remove_bus_instance(dev); |
3703987c | 1294 | if (chipset_responders.bus_destroy) |
d32517e3 | 1295 | (*chipset_responders.bus_destroy)(dev, 0); |
3703987c EA |
1296 | } |
1297 | ||
1298 | static void | |
a298bc0b | 1299 | chipset_device_create(struct visor_device *dev_info) |
3703987c | 1300 | { |
3703987c | 1301 | int rc = -1; |
a298bc0b DZ |
1302 | u32 bus_no = dev_info->chipset_bus_no; |
1303 | u32 dev_no = dev_info->chipset_dev_no; | |
3703987c EA |
1304 | |
1305 | POSTCODE_LINUX_4(DEVICE_CREATE_ENTRY_PC, dev_no, bus_no, | |
1306 | POSTCODE_SEVERITY_INFO); | |
1307 | ||
a298bc0b | 1308 | rc = create_visor_device(dev_info); |
3703987c EA |
1309 | if (rc < 0) { |
1310 | POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, dev_no, bus_no, | |
1311 | POSTCODE_SEVERITY_ERR); | |
d32517e3 DZ |
1312 | if (chipset_responders.device_create) |
1313 | (*chipset_responders.device_create)(dev_info, rc); | |
3703987c | 1314 | } |
d32517e3 | 1315 | |
3703987c EA |
1316 | POSTCODE_LINUX_4(DEVICE_CREATE_SUCCESS_PC, dev_no, bus_no, |
1317 | POSTCODE_SEVERITY_INFO); | |
3703987c EA |
1318 | } |
1319 | ||
1320 | static void | |
a298bc0b | 1321 | chipset_device_destroy(struct visor_device *dev_info) |
3703987c | 1322 | { |
a298bc0b | 1323 | remove_visor_device(dev_info); |
3703987c EA |
1324 | |
1325 | if (chipset_responders.device_destroy) | |
a298bc0b | 1326 | (*chipset_responders.device_destroy) (dev_info, 0); |
3703987c EA |
1327 | } |
1328 | ||
1329 | /* This is the callback function specified for a function driver, to | |
1330 | * be called when a pending "pause device" operation has been | |
1331 | * completed. | |
1332 | */ | |
1333 | static void | |
a298bc0b | 1334 | pause_state_change_complete(struct visor_device *dev, int status) |
3703987c EA |
1335 | { |
1336 | if (!dev->pausing) | |
1337 | return; | |
1338 | ||
779d0752 | 1339 | dev->pausing = false; |
3703987c EA |
1340 | if (!chipset_responders.device_pause) /* this can never happen! */ |
1341 | return; | |
1342 | ||
1343 | /* Notify the chipset driver that the pause is complete, which | |
1344 | * will presumably want to send some sort of response to the | |
1345 | * initiator. */ | |
a298bc0b | 1346 | (*chipset_responders.device_pause) (dev, status); |
3703987c EA |
1347 | } |
1348 | ||
1349 | /* This is the callback function specified for a function driver, to | |
1350 | * be called when a pending "resume device" operation has been | |
1351 | * completed. | |
1352 | */ | |
1353 | static void | |
a298bc0b | 1354 | resume_state_change_complete(struct visor_device *dev, int status) |
3703987c EA |
1355 | { |
1356 | if (!dev->resuming) | |
1357 | return; | |
1358 | ||
779d0752 | 1359 | dev->resuming = false; |
3703987c EA |
1360 | if (!chipset_responders.device_resume) /* this can never happen! */ |
1361 | return; | |
1362 | ||
1363 | /* Notify the chipset driver that the resume is complete, | |
1364 | * which will presumably want to send some sort of response to | |
1365 | * the initiator. */ | |
a298bc0b | 1366 | (*chipset_responders.device_resume) (dev, status); |
3703987c EA |
1367 | } |
1368 | ||
1369 | /* Tell the subordinate function driver for a specific device to pause | |
1370 | * or resume that device. Result is returned asynchronously via a | |
1371 | * callback function. | |
1372 | */ | |
1373 | static void | |
a298bc0b | 1374 | initiate_chipset_device_pause_resume(struct visor_device *dev, bool is_pause) |
3703987c | 1375 | { |
3703987c EA |
1376 | int rc = -1, x; |
1377 | struct visor_driver *drv = NULL; | |
a298bc0b | 1378 | void (*notify_func)(struct visor_device *dev, int response) = NULL; |
3703987c EA |
1379 | |
1380 | if (is_pause) | |
1381 | notify_func = chipset_responders.device_pause; | |
1382 | else | |
1383 | notify_func = chipset_responders.device_resume; | |
1384 | if (!notify_func) | |
1385 | goto away; | |
1386 | ||
3703987c EA |
1387 | drv = to_visor_driver(dev->device.driver); |
1388 | if (!drv) | |
1389 | goto away; | |
1390 | ||
1391 | if (dev->pausing || dev->resuming) | |
1392 | goto away; | |
1393 | ||
1394 | /* Note that even though both drv->pause() and drv->resume | |
1395 | * specify a callback function, it is NOT necessary for us to | |
1396 | * increment our local module usage count. Reason is, there | |
1397 | * is already a linkage dependency between child function | |
1398 | * drivers and visorbus, so it is already IMPOSSIBLE to unload | |
1399 | * visorbus while child function drivers are still running. | |
1400 | */ | |
1401 | if (is_pause) { | |
1402 | if (!drv->pause) | |
1403 | goto away; | |
1404 | ||
779d0752 | 1405 | dev->pausing = true; |
a298bc0b | 1406 | x = drv->pause(dev, pause_state_change_complete); |
3703987c EA |
1407 | } else { |
1408 | /* This should be done at BUS resume time, but an | |
1409 | * existing problem prevents us from ever getting a bus | |
1410 | * resume... This hack would fail to work should we | |
1411 | * ever have a bus that contains NO devices, since we | |
1412 | * would never even get here in that case. */ | |
1413 | fix_vbus_dev_info(dev); | |
1414 | if (!drv->resume) | |
1415 | goto away; | |
1416 | ||
779d0752 | 1417 | dev->resuming = true; |
a298bc0b | 1418 | x = drv->resume(dev, resume_state_change_complete); |
3703987c EA |
1419 | } |
1420 | if (x < 0) { | |
1421 | if (is_pause) | |
779d0752 | 1422 | dev->pausing = false; |
3703987c | 1423 | else |
779d0752 | 1424 | dev->resuming = false; |
3703987c EA |
1425 | goto away; |
1426 | } | |
1427 | rc = 0; | |
1428 | away: | |
1429 | if (rc < 0) { | |
1430 | if (notify_func) | |
a298bc0b | 1431 | (*notify_func)(dev, rc); |
3703987c EA |
1432 | } |
1433 | } | |
1434 | ||
1435 | static void | |
a298bc0b | 1436 | chipset_device_pause(struct visor_device *dev_info) |
3703987c | 1437 | { |
b4b598fd | 1438 | initiate_chipset_device_pause_resume(dev_info, true); |
3703987c EA |
1439 | } |
1440 | ||
1441 | static void | |
a298bc0b | 1442 | chipset_device_resume(struct visor_device *dev_info) |
3703987c | 1443 | { |
b4b598fd | 1444 | initiate_chipset_device_pause_resume(dev_info, false); |
3703987c EA |
1445 | } |
1446 | ||
1447 | struct channel_size_info { | |
1448 | uuid_le guid; | |
1449 | unsigned long min_size; | |
1450 | unsigned long max_size; | |
1451 | }; | |
1452 | ||
55c67dca | 1453 | int |
3703987c EA |
1454 | visorbus_init(void) |
1455 | { | |
1456 | int rc = 0; | |
1457 | ||
1458 | POSTCODE_LINUX_3(DRIVER_ENTRY_PC, rc, POSTCODE_SEVERITY_INFO); | |
1459 | bus_device_info_init(&clientbus_driverinfo, | |
46168810 | 1460 | "clientbus", "visorbus", |
3703987c EA |
1461 | VERSION, NULL); |
1462 | ||
3703987c EA |
1463 | rc = create_bus_type(); |
1464 | if (rc < 0) { | |
1465 | POSTCODE_LINUX_2(BUS_CREATE_ENTRY_PC, DIAG_SEVERITY_ERR); | |
1466 | goto away; | |
1467 | } | |
1468 | ||
1469 | periodic_dev_workqueue = create_singlethread_workqueue("visorbus_dev"); | |
1470 | if (!periodic_dev_workqueue) { | |
1471 | POSTCODE_LINUX_2(CREATE_WORKQUEUE_PC, DIAG_SEVERITY_ERR); | |
1472 | rc = -ENOMEM; | |
1473 | goto away; | |
1474 | } | |
1475 | ||
1476 | /* This enables us to receive notifications when devices appear for | |
1477 | * which this service partition is to be a server for. | |
1478 | */ | |
4da3336c DK |
1479 | visorchipset_register_busdev(&chipset_notifiers, |
1480 | &chipset_responders, | |
1481 | &chipset_driverinfo); | |
3703987c EA |
1482 | |
1483 | rc = 0; | |
1484 | ||
1485 | away: | |
1486 | if (rc) | |
1487 | POSTCODE_LINUX_3(CHIPSET_INIT_FAILURE_PC, rc, | |
1488 | POSTCODE_SEVERITY_ERR); | |
1489 | return rc; | |
1490 | } | |
1491 | ||
c79b28f7 | 1492 | void |
3703987c EA |
1493 | visorbus_exit(void) |
1494 | { | |
1495 | struct list_head *listentry, *listtmp; | |
1496 | ||
4da3336c | 1497 | visorchipset_register_busdev(NULL, NULL, NULL); |
3703987c EA |
1498 | remove_all_visor_devices(); |
1499 | ||
1500 | flush_workqueue(periodic_dev_workqueue); /* better not be any work! */ | |
1501 | destroy_workqueue(periodic_dev_workqueue); | |
1502 | periodic_dev_workqueue = NULL; | |
1503 | ||
1504 | if (periodic_test_workqueue) { | |
1505 | cancel_delayed_work(&periodic_work); | |
1506 | flush_workqueue(periodic_test_workqueue); | |
1507 | destroy_workqueue(periodic_test_workqueue); | |
1508 | periodic_test_workqueue = NULL; | |
1509 | } | |
1510 | ||
1511 | list_for_each_safe(listentry, listtmp, &list_all_bus_instances) { | |
343506bf | 1512 | struct visor_device *dev = list_entry(listentry, |
3703987c | 1513 | struct |
343506bf | 1514 | visor_device, |
3703987c | 1515 | list_all); |
343506bf | 1516 | remove_bus_instance(dev); |
3703987c EA |
1517 | } |
1518 | remove_bus_type(); | |
1519 | } | |
1520 | ||
1521 | module_param_named(debug, visorbus_debug, int, S_IRUGO); | |
1522 | MODULE_PARM_DESC(visorbus_debug, "1 to debug"); | |
3703987c EA |
1523 | |
1524 | module_param_named(forcematch, visorbus_forcematch, int, S_IRUGO); | |
1525 | MODULE_PARM_DESC(visorbus_forcematch, | |
1526 | "1 to force a successful dev <--> drv match"); | |
3703987c EA |
1527 | |
1528 | module_param_named(forcenomatch, visorbus_forcenomatch, int, S_IRUGO); | |
1529 | MODULE_PARM_DESC(visorbus_forcenomatch, | |
1530 | "1 to force an UNsuccessful dev <--> drv match"); | |
3703987c | 1531 | |
3703987c EA |
1532 | module_param_named(debugref, visorbus_debugref, int, S_IRUGO); |
1533 | MODULE_PARM_DESC(visorbus_debugref, "1 to debug reference counting"); | |
3703987c | 1534 | |
3703987c EA |
1535 | MODULE_AUTHOR("Unisys"); |
1536 | MODULE_LICENSE("GPL"); | |
1537 | MODULE_DESCRIPTION("Supervisor bus driver for service partition: ver " VERSION); | |
1538 | MODULE_VERSION(VERSION); |