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3703987c EA |
1 | /* visorbus_main.c |
2 | * | |
6f14cc18 | 3 | * Copyright � 2010 - 2015 UNISYS CORPORATION |
3703987c EA |
4 | * All rights reserved. |
5 | * | |
6f14cc18 BR |
6 | * This program is free software; you can redistribute it and/or modify it |
7 | * under the terms and conditions of the GNU General Public License, | |
8 | * version 2, as published by the Free Software Foundation. | |
3703987c EA |
9 | * |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
13 | * NON INFRINGEMENT. See the GNU General Public License for more | |
14 | * details. | |
15 | */ | |
16 | ||
17 | #include <linux/uuid.h> | |
18 | ||
4b78000e | 19 | #include "visorbus.h" |
c79b28f7 | 20 | #include "visorbus_private.h" |
4b78000e | 21 | #include "version.h" |
3703987c EA |
22 | #include "periodic_work.h" |
23 | #include "vbuschannel.h" | |
24 | #include "guestlinuxdebug.h" | |
0f41c727 | 25 | #include "vmcallinterface.h" |
4b78000e | 26 | |
c79b28f7 PB |
27 | #define MYDRVNAME "visorbus" |
28 | ||
4b78000e | 29 | /* module parameters */ |
f6758e79 DF |
30 | static int visorbus_debug; |
31 | static int visorbus_forcematch; | |
32 | static int visorbus_forcenomatch; | |
f6758e79 | 33 | static int visorbus_debugref; |
4b78000e PB |
34 | #define SERIALLOOPBACKCHANADDR (100 * 1024 * 1024) |
35 | ||
3703987c EA |
36 | #define CURRENT_FILE_PC VISOR_BUS_PC_visorbus_main_c |
37 | #define POLLJIFFIES_TESTWORK 100 | |
38 | #define POLLJIFFIES_NORMALCHANNEL 10 | |
39 | ||
6155a3cf BR |
40 | static int busreg_rc = -ENODEV; /* stores the result from bus registration */ |
41 | ||
3703987c EA |
42 | static int visorbus_uevent(struct device *xdev, struct kobj_uevent_env *env); |
43 | static int visorbus_match(struct device *xdev, struct device_driver *xdrv); | |
44 | static void fix_vbus_dev_info(struct visor_device *visordev); | |
45 | ||
68b04f1f DZ |
46 | /* BUS type attributes |
47 | * | |
48 | * define & implement display of bus attributes under | |
49 | * /sys/bus/visorbus. | |
50 | * | |
51 | */ | |
52 | ||
53 | static ssize_t version_show(struct bus_type *bus, char *buf) | |
54 | { | |
55 | return snprintf(buf, PAGE_SIZE, "%s\n", VERSION); | |
56 | } | |
57 | ||
58 | static BUS_ATTR_RO(version); | |
59 | ||
60 | static struct attribute *visorbus_bus_attrs[] = { | |
61 | &bus_attr_version.attr, | |
62 | NULL, | |
63 | }; | |
64 | ||
65 | static const struct attribute_group visorbus_bus_group = { | |
66 | .attrs = visorbus_bus_attrs, | |
67 | }; | |
68 | ||
f6758e79 | 69 | static const struct attribute_group *visorbus_bus_groups[] = { |
68b04f1f DZ |
70 | &visorbus_bus_group, |
71 | NULL, | |
72 | }; | |
73 | ||
59fd2c8b PB |
74 | /* |
75 | * DEVICE type attributes | |
76 | * | |
77 | * The modalias file will contain the guid of the device. | |
78 | */ | |
79 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, | |
80 | char *buf) | |
81 | { | |
82 | struct visor_device *vdev; | |
83 | uuid_le guid; | |
84 | ||
85 | vdev = to_visor_device(dev); | |
86 | guid = visorchannel_get_uuid(vdev->visorchannel); | |
87 | return snprintf(buf, PAGE_SIZE, "visorbus:%pUl\n", &guid); | |
88 | } | |
89 | static DEVICE_ATTR_RO(modalias); | |
90 | ||
91 | static struct attribute *visorbus_dev_attrs[] = { | |
92 | &dev_attr_modalias.attr, | |
93 | NULL, | |
94 | }; | |
95 | ||
96 | /* sysfs example for bridge-only sysfs files using device_type's */ | |
97 | static const struct attribute_group visorbus_dev_group = { | |
98 | .attrs = visorbus_dev_attrs, | |
99 | }; | |
100 | ||
cf7281c9 | 101 | static const struct attribute_group *visorbus_dev_groups[] = { |
59fd2c8b PB |
102 | &visorbus_dev_group, |
103 | NULL, | |
104 | }; | |
105 | ||
3703987c EA |
106 | /** This describes the TYPE of bus. |
107 | * (Don't confuse this with an INSTANCE of the bus.) | |
108 | */ | |
1fb3016e | 109 | struct bus_type visorbus_type = { |
3703987c EA |
110 | .name = "visorbus", |
111 | .match = visorbus_match, | |
112 | .uevent = visorbus_uevent, | |
59fd2c8b | 113 | .dev_groups = visorbus_dev_groups, |
68b04f1f | 114 | .bus_groups = visorbus_bus_groups, |
3703987c EA |
115 | }; |
116 | ||
117 | static struct delayed_work periodic_work; | |
118 | ||
119 | /* YES, we need 2 workqueues. | |
120 | * The reason is, workitems on the test queue may need to cancel | |
121 | * workitems on the other queue. You will be in for trouble if you try to | |
122 | * do this with workitems queued on the same workqueue. | |
123 | */ | |
124 | static struct workqueue_struct *periodic_test_workqueue; | |
125 | static struct workqueue_struct *periodic_dev_workqueue; | |
126 | static long long bus_count; /** number of bus instances */ | |
3703987c EA |
127 | /** ever-increasing */ |
128 | ||
d32517e3 DZ |
129 | static void chipset_bus_create(struct visor_device *bus_info); |
130 | static void chipset_bus_destroy(struct visor_device *bus_info); | |
a298bc0b DZ |
131 | static void chipset_device_create(struct visor_device *dev_info); |
132 | static void chipset_device_destroy(struct visor_device *dev_info); | |
133 | static void chipset_device_pause(struct visor_device *dev_info); | |
134 | static void chipset_device_resume(struct visor_device *dev_info); | |
3703987c EA |
135 | |
136 | /** These functions are implemented herein, and are called by the chipset | |
137 | * driver to notify us about specific events. | |
138 | */ | |
139 | static struct visorchipset_busdev_notifiers chipset_notifiers = { | |
140 | .bus_create = chipset_bus_create, | |
141 | .bus_destroy = chipset_bus_destroy, | |
142 | .device_create = chipset_device_create, | |
143 | .device_destroy = chipset_device_destroy, | |
144 | .device_pause = chipset_device_pause, | |
145 | .device_resume = chipset_device_resume, | |
146 | }; | |
147 | ||
148 | /** These functions are implemented in the chipset driver, and we call them | |
149 | * herein when we want to acknowledge a specific event. | |
150 | */ | |
151 | static struct visorchipset_busdev_responders chipset_responders; | |
152 | ||
153 | /* filled in with info about parent chipset driver when we register with it */ | |
154 | static struct ultra_vbus_deviceinfo chipset_driverinfo; | |
155 | /* filled in with info about this driver, wrt it servicing client busses */ | |
156 | static struct ultra_vbus_deviceinfo clientbus_driverinfo; | |
157 | ||
343506bf | 158 | /** list of visor_device structs, linked via .list_all */ |
3703987c EA |
159 | static LIST_HEAD(list_all_bus_instances); |
160 | /** list of visor_device structs, linked via .list_all */ | |
161 | static LIST_HEAD(list_all_device_instances); | |
162 | ||
163 | static int | |
164 | visorbus_uevent(struct device *xdev, struct kobj_uevent_env *env) | |
165 | { | |
59fd2c8b PB |
166 | struct visor_device *dev; |
167 | uuid_le guid; | |
168 | ||
169 | dev = to_visor_device(xdev); | |
170 | guid = visorchannel_get_uuid(dev->visorchannel); | |
171 | ||
172 | if (add_uevent_var(env, "MODALIAS=visorbus:%pUl", &guid)) | |
3703987c EA |
173 | return -ENOMEM; |
174 | return 0; | |
175 | } | |
176 | ||
177 | /* This is called automatically upon adding a visor_device (device_add), or | |
178 | * adding a visor_driver (visorbus_register_visor_driver), and returns 1 iff the | |
179 | * provided driver can control the specified device. | |
180 | */ | |
181 | static int | |
182 | visorbus_match(struct device *xdev, struct device_driver *xdrv) | |
183 | { | |
184 | uuid_le channel_type; | |
185 | int rc = 0; | |
186 | int i; | |
187 | struct visor_device *dev; | |
188 | struct visor_driver *drv; | |
189 | ||
190 | dev = to_visor_device(xdev); | |
191 | drv = to_visor_driver(xdrv); | |
192 | channel_type = visorchannel_get_uuid(dev->visorchannel); | |
193 | if (visorbus_forcematch) { | |
194 | rc = 1; | |
195 | goto away; | |
196 | } | |
197 | if (visorbus_forcenomatch) | |
198 | goto away; | |
199 | ||
200 | if (!drv->channel_types) | |
201 | goto away; | |
202 | for (i = 0; | |
203 | (uuid_le_cmp(drv->channel_types[i].guid, NULL_UUID_LE) != 0) || | |
204 | (drv->channel_types[i].name); | |
205 | i++) | |
206 | if (uuid_le_cmp(drv->channel_types[i].guid, | |
207 | channel_type) == 0) { | |
208 | rc = i + 1; | |
209 | goto away; | |
210 | } | |
211 | away: | |
212 | return rc; | |
213 | } | |
214 | ||
215 | /** This is called when device_unregister() is called for the bus device | |
216 | * instance, after all other tasks involved with destroying the device | |
217 | * are complete. | |
218 | */ | |
219 | static void | |
220 | visorbus_release_busdevice(struct device *xdev) | |
221 | { | |
343506bf | 222 | struct visor_device *dev = dev_get_drvdata(xdev); |
3703987c EA |
223 | |
224 | dev_set_drvdata(xdev, NULL); | |
343506bf | 225 | kfree(dev); |
3703987c EA |
226 | } |
227 | ||
228 | /** This is called when device_unregister() is called for each child | |
229 | * device instance. | |
230 | */ | |
231 | static void | |
232 | visorbus_release_device(struct device *xdev) | |
233 | { | |
234 | struct visor_device *dev = to_visor_device(xdev); | |
235 | ||
236 | if (dev->periodic_work) { | |
237 | visor_periodic_work_destroy(dev->periodic_work); | |
238 | dev->periodic_work = NULL; | |
239 | } | |
240 | if (dev->visorchannel) { | |
241 | visorchannel_destroy(dev->visorchannel); | |
242 | dev->visorchannel = NULL; | |
243 | } | |
244 | kfree(dev); | |
245 | } | |
246 | ||
32710457 PB |
247 | /* Implement publishing of device node attributes under: |
248 | * | |
249 | * /sys/bus/visorbus<x>/dev<y>/devmajorminor | |
250 | * | |
251 | */ | |
252 | ||
253 | #define to_devmajorminor_attr(_attr) \ | |
254 | container_of(_attr, struct devmajorminor_attribute, attr) | |
255 | #define to_visor_device_from_kobjdevmajorminor(obj) \ | |
256 | container_of(obj, struct visor_device, kobjdevmajorminor) | |
257 | ||
258 | struct devmajorminor_attribute { | |
259 | struct attribute attr; | |
260 | int slot; | |
216c3e2c CJ |
261 | ssize_t (*show)(struct visor_device *, int slot, char *buf); |
262 | ssize_t (*store)(struct visor_device *, int slot, const char *buf, | |
263 | size_t count); | |
32710457 PB |
264 | }; |
265 | ||
266 | static ssize_t DEVMAJORMINOR_ATTR(struct visor_device *dev, int slot, char *buf) | |
267 | { | |
268 | int maxdevnodes = ARRAY_SIZE(dev->devnodes) / sizeof(dev->devnodes[0]); | |
269 | ||
270 | if (slot < 0 || slot >= maxdevnodes) | |
271 | return 0; | |
272 | return snprintf(buf, PAGE_SIZE, "%d:%d\n", | |
273 | dev->devnodes[slot].major, dev->devnodes[slot].minor); | |
274 | } | |
275 | ||
276 | static ssize_t | |
277 | devmajorminor_attr_show(struct kobject *kobj, struct attribute *attr, char *buf) | |
278 | { | |
279 | struct devmajorminor_attribute *devmajorminor_attr = | |
280 | to_devmajorminor_attr(attr); | |
281 | struct visor_device *dev = to_visor_device_from_kobjdevmajorminor(kobj); | |
282 | ssize_t ret = 0; | |
283 | ||
284 | if (devmajorminor_attr->show) | |
285 | ret = devmajorminor_attr->show(dev, | |
286 | devmajorminor_attr->slot, buf); | |
287 | return ret; | |
288 | } | |
289 | ||
290 | static ssize_t | |
291 | devmajorminor_attr_store(struct kobject *kobj, | |
292 | struct attribute *attr, const char *buf, size_t count) | |
293 | { | |
294 | struct devmajorminor_attribute *devmajorminor_attr = | |
295 | to_devmajorminor_attr(attr); | |
296 | struct visor_device *dev = to_visor_device_from_kobjdevmajorminor(kobj); | |
297 | ssize_t ret = 0; | |
298 | ||
299 | if (devmajorminor_attr->store) | |
300 | ret = devmajorminor_attr->store(dev, | |
301 | devmajorminor_attr->slot, | |
302 | buf, count); | |
303 | return ret; | |
304 | } | |
305 | ||
306 | static int register_devmajorminor_attributes(struct visor_device *dev); | |
307 | ||
f6758e79 | 308 | static int |
32710457 PB |
309 | devmajorminor_create_file(struct visor_device *dev, const char *name, |
310 | int major, int minor) | |
311 | { | |
312 | int maxdevnodes = ARRAY_SIZE(dev->devnodes) / sizeof(dev->devnodes[0]); | |
313 | struct devmajorminor_attribute *myattr = NULL; | |
314 | int x = -1, rc = 0, slot = -1; | |
315 | ||
316 | register_devmajorminor_attributes(dev); | |
317 | for (slot = 0; slot < maxdevnodes; slot++) | |
318 | if (!dev->devnodes[slot].attr) | |
319 | break; | |
320 | if (slot == maxdevnodes) { | |
321 | rc = -ENOMEM; | |
322 | goto away; | |
323 | } | |
0aa5ae1e | 324 | myattr = kzalloc(sizeof(*myattr), GFP_KERNEL); |
32710457 PB |
325 | if (!myattr) { |
326 | rc = -ENOMEM; | |
327 | goto away; | |
328 | } | |
32710457 PB |
329 | myattr->show = DEVMAJORMINOR_ATTR; |
330 | myattr->store = NULL; | |
331 | myattr->slot = slot; | |
332 | myattr->attr.name = name; | |
333 | myattr->attr.mode = S_IRUGO; | |
334 | dev->devnodes[slot].attr = myattr; | |
335 | dev->devnodes[slot].major = major; | |
336 | dev->devnodes[slot].minor = minor; | |
337 | x = sysfs_create_file(&dev->kobjdevmajorminor, &myattr->attr); | |
338 | if (x < 0) { | |
339 | rc = x; | |
340 | goto away; | |
341 | } | |
342 | kobject_uevent(&dev->device.kobj, KOBJ_ONLINE); | |
343 | away: | |
344 | if (rc < 0) { | |
345 | kfree(myattr); | |
346 | myattr = NULL; | |
347 | dev->devnodes[slot].attr = NULL; | |
348 | } | |
349 | return rc; | |
350 | } | |
351 | ||
f6758e79 | 352 | static void |
32710457 PB |
353 | devmajorminor_remove_file(struct visor_device *dev, int slot) |
354 | { | |
355 | int maxdevnodes = ARRAY_SIZE(dev->devnodes) / sizeof(dev->devnodes[0]); | |
356 | struct devmajorminor_attribute *myattr = NULL; | |
357 | ||
358 | if (slot < 0 || slot >= maxdevnodes) | |
359 | return; | |
360 | myattr = (struct devmajorminor_attribute *)(dev->devnodes[slot].attr); | |
04dacacc | 361 | if (!myattr) |
32710457 PB |
362 | return; |
363 | sysfs_remove_file(&dev->kobjdevmajorminor, &myattr->attr); | |
364 | kobject_uevent(&dev->device.kobj, KOBJ_OFFLINE); | |
365 | dev->devnodes[slot].attr = NULL; | |
366 | kfree(myattr); | |
367 | } | |
368 | ||
f6758e79 | 369 | static void |
32710457 PB |
370 | devmajorminor_remove_all_files(struct visor_device *dev) |
371 | { | |
372 | int i = 0; | |
373 | int maxdevnodes = ARRAY_SIZE(dev->devnodes) / sizeof(dev->devnodes[0]); | |
374 | ||
375 | for (i = 0; i < maxdevnodes; i++) | |
376 | devmajorminor_remove_file(dev, i); | |
377 | } | |
378 | ||
379 | static const struct sysfs_ops devmajorminor_sysfs_ops = { | |
380 | .show = devmajorminor_attr_show, | |
381 | .store = devmajorminor_attr_store, | |
382 | }; | |
383 | ||
384 | static struct kobj_type devmajorminor_kobj_type = { | |
385 | .sysfs_ops = &devmajorminor_sysfs_ops | |
386 | }; | |
387 | ||
388 | static int | |
389 | register_devmajorminor_attributes(struct visor_device *dev) | |
390 | { | |
391 | int rc = 0, x = 0; | |
392 | ||
393 | if (dev->kobjdevmajorminor.parent) | |
394 | goto away; /* already registered */ | |
395 | x = kobject_init_and_add(&dev->kobjdevmajorminor, | |
396 | &devmajorminor_kobj_type, &dev->device.kobj, | |
397 | "devmajorminor"); | |
398 | if (x < 0) { | |
399 | rc = x; | |
400 | goto away; | |
401 | } | |
402 | ||
403 | kobject_uevent(&dev->kobjdevmajorminor, KOBJ_ADD); | |
404 | ||
405 | away: | |
406 | return rc; | |
407 | } | |
408 | ||
f6758e79 | 409 | static void |
32710457 PB |
410 | unregister_devmajorminor_attributes(struct visor_device *dev) |
411 | { | |
412 | if (!dev->kobjdevmajorminor.parent) | |
413 | return; /* already unregistered */ | |
414 | devmajorminor_remove_all_files(dev); | |
415 | ||
416 | kobject_del(&dev->kobjdevmajorminor); | |
417 | kobject_put(&dev->kobjdevmajorminor); | |
418 | dev->kobjdevmajorminor.parent = NULL; | |
419 | } | |
420 | ||
826b6a0f PB |
421 | /* begin implementation of specific channel attributes to appear under |
422 | * /sys/bus/visorbus<x>/dev<y>/channel | |
423 | */ | |
79573162 DZ |
424 | static ssize_t physaddr_show(struct device *dev, struct device_attribute *attr, |
425 | char *buf) | |
826b6a0f | 426 | { |
79573162 DZ |
427 | struct visor_device *vdev = to_visor_device(dev); |
428 | ||
429 | if (!vdev->visorchannel) | |
826b6a0f PB |
430 | return 0; |
431 | return snprintf(buf, PAGE_SIZE, "0x%Lx\n", | |
79573162 | 432 | visorchannel_get_physaddr(vdev->visorchannel)); |
826b6a0f PB |
433 | } |
434 | ||
79573162 DZ |
435 | static ssize_t nbytes_show(struct device *dev, struct device_attribute *attr, |
436 | char *buf) | |
826b6a0f | 437 | { |
79573162 DZ |
438 | struct visor_device *vdev = to_visor_device(dev); |
439 | ||
440 | if (!vdev->visorchannel) | |
826b6a0f PB |
441 | return 0; |
442 | return snprintf(buf, PAGE_SIZE, "0x%lx\n", | |
79573162 | 443 | visorchannel_get_nbytes(vdev->visorchannel)); |
826b6a0f PB |
444 | } |
445 | ||
79573162 DZ |
446 | static ssize_t clientpartition_show(struct device *dev, |
447 | struct device_attribute *attr, char *buf) | |
448 | { | |
449 | struct visor_device *vdev = to_visor_device(dev); | |
450 | ||
451 | if (!vdev->visorchannel) | |
826b6a0f PB |
452 | return 0; |
453 | return snprintf(buf, PAGE_SIZE, "0x%Lx\n", | |
79573162 | 454 | visorchannel_get_clientpartition(vdev->visorchannel)); |
826b6a0f PB |
455 | } |
456 | ||
79573162 DZ |
457 | static ssize_t typeguid_show(struct device *dev, struct device_attribute *attr, |
458 | char *buf) | |
826b6a0f | 459 | { |
79573162 | 460 | struct visor_device *vdev = to_visor_device(dev); |
826b6a0f PB |
461 | char s[99]; |
462 | ||
79573162 | 463 | if (!vdev->visorchannel) |
826b6a0f PB |
464 | return 0; |
465 | return snprintf(buf, PAGE_SIZE, "%s\n", | |
79573162 | 466 | visorchannel_id(vdev->visorchannel, s)); |
826b6a0f PB |
467 | } |
468 | ||
79573162 DZ |
469 | static ssize_t zoneguid_show(struct device *dev, struct device_attribute *attr, |
470 | char *buf) | |
826b6a0f | 471 | { |
79573162 | 472 | struct visor_device *vdev = to_visor_device(dev); |
826b6a0f PB |
473 | char s[99]; |
474 | ||
79573162 | 475 | if (!vdev->visorchannel) |
826b6a0f PB |
476 | return 0; |
477 | return snprintf(buf, PAGE_SIZE, "%s\n", | |
79573162 | 478 | visorchannel_zoneid(vdev->visorchannel, s)); |
826b6a0f PB |
479 | } |
480 | ||
79573162 DZ |
481 | static ssize_t typename_show(struct device *dev, struct device_attribute *attr, |
482 | char *buf) | |
826b6a0f | 483 | { |
79573162 | 484 | struct visor_device *vdev = to_visor_device(dev); |
826b6a0f | 485 | int i = 0; |
79573162 DZ |
486 | struct bus_type *xbus = dev->bus; |
487 | struct device_driver *xdrv = dev->driver; | |
826b6a0f PB |
488 | struct visor_driver *drv = NULL; |
489 | ||
79573162 | 490 | if (!vdev->visorchannel || !xbus || !xdrv) |
826b6a0f | 491 | return 0; |
79573162 | 492 | i = xbus->match(dev, xdrv); |
826b6a0f PB |
493 | if (!i) |
494 | return 0; | |
495 | drv = to_visor_driver(xdrv); | |
496 | return snprintf(buf, PAGE_SIZE, "%s\n", drv->channel_types[i - 1].name); | |
497 | } | |
498 | ||
79573162 DZ |
499 | static DEVICE_ATTR_RO(physaddr); |
500 | static DEVICE_ATTR_RO(nbytes); | |
501 | static DEVICE_ATTR_RO(clientpartition); | |
502 | static DEVICE_ATTR_RO(typeguid); | |
503 | static DEVICE_ATTR_RO(zoneguid); | |
504 | static DEVICE_ATTR_RO(typename); | |
79573162 DZ |
505 | |
506 | static struct attribute *channel_attrs[] = { | |
507 | &dev_attr_physaddr.attr, | |
508 | &dev_attr_nbytes.attr, | |
509 | &dev_attr_clientpartition.attr, | |
510 | &dev_attr_typeguid.attr, | |
511 | &dev_attr_zoneguid.attr, | |
512 | &dev_attr_typename.attr, | |
fd012d0d | 513 | NULL |
826b6a0f PB |
514 | }; |
515 | ||
79573162 DZ |
516 | static struct attribute_group channel_attr_grp = { |
517 | .name = "channel", | |
518 | .attrs = channel_attrs, | |
826b6a0f PB |
519 | }; |
520 | ||
59fd2c8b | 521 | static const struct attribute_group *visorbus_channel_groups[] = { |
79573162 DZ |
522 | &channel_attr_grp, |
523 | NULL | |
826b6a0f PB |
524 | }; |
525 | ||
79573162 | 526 | /* end implementation of specific channel attributes */ |
826b6a0f | 527 | |
3703987c EA |
528 | /* BUS instance attributes |
529 | * | |
530 | * define & implement display of bus attributes under | |
531 | * /sys/bus/visorbus/busses/visorbus<n>. | |
532 | * | |
533 | * This is a bit hoaky because the kernel does not yet have the infrastructure | |
534 | * to separate bus INSTANCE attributes from bus TYPE attributes... | |
535 | * so we roll our own. See businst.c / businst.h. | |
536 | * | |
537 | */ | |
538 | ||
d181dd03 DZ |
539 | static ssize_t partition_handle_show(struct device *dev, |
540 | struct device_attribute *attr, | |
541 | char *buf) { | |
5ecbd5d4 DZ |
542 | struct visor_device *vdev = to_visor_device(dev); |
543 | u64 handle = visorchannel_get_clientpartition(vdev->visorchannel); | |
3703987c | 544 | |
5ecbd5d4 | 545 | return snprintf(buf, PAGE_SIZE, "0x%Lx\n", handle); |
3703987c EA |
546 | } |
547 | ||
d181dd03 DZ |
548 | static ssize_t partition_guid_show(struct device *dev, |
549 | struct device_attribute *attr, | |
550 | char *buf) { | |
5ecbd5d4 | 551 | struct visor_device *vdev = to_visor_device(dev); |
3703987c | 552 | |
5ecbd5d4 | 553 | return snprintf(buf, PAGE_SIZE, "{%pUb}\n", &vdev->partition_uuid); |
3703987c EA |
554 | } |
555 | ||
d181dd03 DZ |
556 | static ssize_t partition_name_show(struct device *dev, |
557 | struct device_attribute *attr, | |
558 | char *buf) { | |
5ecbd5d4 | 559 | struct visor_device *vdev = to_visor_device(dev); |
3703987c | 560 | |
5ecbd5d4 | 561 | return snprintf(buf, PAGE_SIZE, "%s\n", vdev->name); |
3703987c EA |
562 | } |
563 | ||
d181dd03 DZ |
564 | static ssize_t channel_addr_show(struct device *dev, |
565 | struct device_attribute *attr, | |
566 | char *buf) { | |
5ecbd5d4 DZ |
567 | struct visor_device *vdev = to_visor_device(dev); |
568 | u64 addr = visorchannel_get_physaddr(vdev->visorchannel); | |
3703987c | 569 | |
5ecbd5d4 | 570 | return snprintf(buf, PAGE_SIZE, "0x%Lx\n", addr); |
3703987c EA |
571 | } |
572 | ||
d181dd03 DZ |
573 | static ssize_t channel_bytes_show(struct device *dev, |
574 | struct device_attribute *attr, | |
575 | char *buf) { | |
5ecbd5d4 DZ |
576 | struct visor_device *vdev = to_visor_device(dev); |
577 | u64 nbytes = visorchannel_get_nbytes(vdev->visorchannel); | |
3703987c | 578 | |
5ecbd5d4 | 579 | return snprintf(buf, PAGE_SIZE, "0x%Lx\n", nbytes); |
3703987c EA |
580 | } |
581 | ||
d181dd03 DZ |
582 | static ssize_t channel_id_show(struct device *dev, |
583 | struct device_attribute *attr, | |
584 | char *buf) { | |
5ecbd5d4 | 585 | struct visor_device *vdev = to_visor_device(dev); |
3703987c EA |
586 | int len = 0; |
587 | ||
5ecbd5d4 DZ |
588 | if (vdev->visorchannel) { |
589 | visorchannel_id(vdev->visorchannel, buf); | |
3703987c EA |
590 | len = strlen(buf); |
591 | buf[len++] = '\n'; | |
592 | } | |
593 | return len; | |
594 | } | |
595 | ||
d181dd03 DZ |
596 | static ssize_t client_bus_info_show(struct device *dev, |
597 | struct device_attribute *attr, | |
598 | char *buf) { | |
5ecbd5d4 DZ |
599 | struct visor_device *vdev = to_visor_device(dev); |
600 | struct visorchannel *channel = vdev->visorchannel; | |
601 | ||
3703987c EA |
602 | int i, x, remain = PAGE_SIZE; |
603 | unsigned long off; | |
604 | char *p = buf; | |
605 | u8 *partition_name; | |
606 | struct ultra_vbus_deviceinfo dev_info; | |
607 | ||
608 | partition_name = ""; | |
5ecbd5d4 DZ |
609 | if (channel) { |
610 | if (vdev->name) | |
611 | partition_name = vdev->name; | |
3703987c | 612 | x = snprintf(p, remain, |
65bd6e46 | 613 | "Client device / client driver info for %s partition (vbus #%d):\n", |
5ecbd5d4 | 614 | partition_name, vdev->chipset_dev_no); |
3703987c EA |
615 | p += x; |
616 | remain -= x; | |
5ecbd5d4 | 617 | x = visorchannel_read(channel, |
3703987c EA |
618 | offsetof(struct |
619 | spar_vbus_channel_protocol, | |
620 | chp_info), | |
621 | &dev_info, sizeof(dev_info)); | |
622 | if (x >= 0) { | |
623 | x = vbuschannel_devinfo_to_string(&dev_info, p, | |
624 | remain, -1); | |
625 | p += x; | |
626 | remain -= x; | |
627 | } | |
5ecbd5d4 | 628 | x = visorchannel_read(channel, |
3703987c EA |
629 | offsetof(struct |
630 | spar_vbus_channel_protocol, | |
631 | bus_info), | |
632 | &dev_info, sizeof(dev_info)); | |
633 | if (x >= 0) { | |
634 | x = vbuschannel_devinfo_to_string(&dev_info, p, | |
635 | remain, -1); | |
636 | p += x; | |
637 | remain -= x; | |
638 | } | |
639 | off = offsetof(struct spar_vbus_channel_protocol, dev_info); | |
640 | i = 0; | |
641 | while (off + sizeof(dev_info) <= | |
5ecbd5d4 DZ |
642 | visorchannel_get_nbytes(channel)) { |
643 | x = visorchannel_read(channel, | |
3703987c EA |
644 | off, &dev_info, sizeof(dev_info)); |
645 | if (x >= 0) { | |
646 | x = vbuschannel_devinfo_to_string | |
647 | (&dev_info, p, remain, i); | |
648 | p += x; | |
649 | remain -= x; | |
650 | } | |
651 | off += sizeof(dev_info); | |
652 | i++; | |
653 | } | |
654 | } | |
655 | return PAGE_SIZE - remain; | |
656 | } | |
657 | ||
d181dd03 DZ |
658 | static DEVICE_ATTR_RO(partition_handle); |
659 | static DEVICE_ATTR_RO(partition_guid); | |
660 | static DEVICE_ATTR_RO(partition_name); | |
661 | static DEVICE_ATTR_RO(channel_addr); | |
662 | static DEVICE_ATTR_RO(channel_bytes); | |
663 | static DEVICE_ATTR_RO(channel_id); | |
664 | static DEVICE_ATTR_RO(client_bus_info); | |
665 | ||
666 | static struct attribute *dev_attrs[] = { | |
667 | &dev_attr_partition_handle.attr, | |
668 | &dev_attr_partition_guid.attr, | |
669 | &dev_attr_partition_name.attr, | |
670 | &dev_attr_channel_addr.attr, | |
671 | &dev_attr_channel_bytes.attr, | |
672 | &dev_attr_channel_id.attr, | |
673 | &dev_attr_client_bus_info.attr, | |
674 | NULL | |
675 | }; | |
3703987c | 676 | |
d181dd03 DZ |
677 | static struct attribute_group dev_attr_grp = { |
678 | .attrs = dev_attrs, | |
679 | }; | |
3703987c | 680 | |
d181dd03 DZ |
681 | static const struct attribute_group *visorbus_groups[] = { |
682 | &dev_attr_grp, | |
683 | NULL | |
684 | }; | |
3703987c EA |
685 | |
686 | /* DRIVER attributes | |
687 | * | |
688 | * define & implement display of driver attributes under | |
689 | * /sys/bus/visorbus/drivers/<drivername>. | |
690 | * | |
691 | */ | |
692 | ||
693 | static ssize_t | |
694 | DRIVER_ATTR_version(struct device_driver *xdrv, char *buf) | |
695 | { | |
696 | struct visor_driver *drv = to_visor_driver(xdrv); | |
697 | ||
698 | return snprintf(buf, PAGE_SIZE, "%s\n", drv->version); | |
699 | } | |
700 | ||
701 | static int | |
702 | register_driver_attributes(struct visor_driver *drv) | |
703 | { | |
704 | int rc; | |
705 | struct driver_attribute version = | |
706 | __ATTR(version, S_IRUGO, DRIVER_ATTR_version, NULL); | |
707 | drv->version_attr = version; | |
708 | rc = driver_create_file(&drv->driver, &drv->version_attr); | |
709 | return rc; | |
710 | } | |
711 | ||
712 | static void | |
713 | unregister_driver_attributes(struct visor_driver *drv) | |
714 | { | |
715 | driver_remove_file(&drv->driver, &drv->version_attr); | |
716 | } | |
717 | ||
3703987c EA |
718 | static void |
719 | dev_periodic_work(void *xdev) | |
720 | { | |
0df4e3e9 | 721 | struct visor_device *dev = xdev; |
3703987c EA |
722 | struct visor_driver *drv = to_visor_driver(dev->device.driver); |
723 | ||
724 | down(&dev->visordriver_callback_lock); | |
725 | if (drv->channel_interrupt) | |
726 | drv->channel_interrupt(dev); | |
727 | up(&dev->visordriver_callback_lock); | |
728 | if (!visor_periodic_work_nextperiod(dev->periodic_work)) | |
729 | put_device(&dev->device); | |
730 | } | |
731 | ||
732 | static void | |
733 | dev_start_periodic_work(struct visor_device *dev) | |
734 | { | |
735 | if (dev->being_removed) | |
736 | return; | |
737 | /* now up by at least 2 */ | |
738 | get_device(&dev->device); | |
739 | if (!visor_periodic_work_start(dev->periodic_work)) | |
740 | put_device(&dev->device); | |
741 | } | |
742 | ||
743 | static void | |
744 | dev_stop_periodic_work(struct visor_device *dev) | |
745 | { | |
746 | if (visor_periodic_work_stop(dev->periodic_work)) | |
747 | put_device(&dev->device); | |
748 | } | |
749 | ||
750 | /** This is called automatically upon adding a visor_device (device_add), or | |
751 | * adding a visor_driver (visorbus_register_visor_driver), but only after | |
752 | * visorbus_match has returned 1 to indicate a successful match between | |
753 | * driver and device. | |
754 | */ | |
755 | static int | |
756 | visordriver_probe_device(struct device *xdev) | |
757 | { | |
758 | int rc; | |
759 | struct visor_driver *drv; | |
760 | struct visor_device *dev; | |
761 | ||
762 | drv = to_visor_driver(xdev->driver); | |
763 | dev = to_visor_device(xdev); | |
764 | down(&dev->visordriver_callback_lock); | |
779d0752 | 765 | dev->being_removed = false; |
3703987c EA |
766 | /* |
767 | * ensure that the dev->being_removed flag is cleared before | |
768 | * we start the probe | |
769 | */ | |
770 | wmb(); | |
771 | get_device(&dev->device); | |
772 | if (!drv->probe) { | |
773 | up(&dev->visordriver_callback_lock); | |
774 | rc = -1; | |
775 | goto away; | |
776 | } | |
777 | rc = drv->probe(dev); | |
778 | if (rc < 0) | |
779 | goto away; | |
780 | ||
781 | fix_vbus_dev_info(dev); | |
782 | up(&dev->visordriver_callback_lock); | |
783 | rc = 0; | |
784 | away: | |
785 | if (rc != 0) | |
786 | put_device(&dev->device); | |
3703987c EA |
787 | return rc; |
788 | } | |
789 | ||
790 | /** This is called when device_unregister() is called for each child device | |
791 | * instance, to notify the appropriate visorbus_driver that the device is | |
792 | * going away, and to decrease the reference count of the device. | |
793 | */ | |
794 | static int | |
795 | visordriver_remove_device(struct device *xdev) | |
796 | { | |
3703987c EA |
797 | struct visor_device *dev; |
798 | struct visor_driver *drv; | |
799 | ||
800 | dev = to_visor_device(xdev); | |
801 | drv = to_visor_driver(xdev->driver); | |
802 | down(&dev->visordriver_callback_lock); | |
779d0752 | 803 | dev->being_removed = true; |
3703987c EA |
804 | /* |
805 | * ensure that the dev->being_removed flag is set before we start the | |
806 | * actual removal | |
807 | */ | |
808 | wmb(); | |
809 | if (drv) { | |
810 | if (drv->remove) | |
811 | drv->remove(dev); | |
812 | } | |
813 | up(&dev->visordriver_callback_lock); | |
814 | dev_stop_periodic_work(dev); | |
815 | devmajorminor_remove_all_files(dev); | |
816 | ||
817 | put_device(&dev->device); | |
818 | ||
df7f46e8 | 819 | return 0; |
3703987c EA |
820 | } |
821 | ||
822 | /** A particular type of visor driver calls this function to register | |
823 | * the driver. The caller MUST fill in the following fields within the | |
824 | * #drv structure: | |
825 | * name, version, owner, channel_types, probe, remove | |
826 | * | |
827 | * Here's how the whole Linux bus / driver / device model works. | |
828 | * | |
829 | * At system start-up, the visorbus kernel module is loaded, which registers | |
830 | * visorbus_type as a bus type, using bus_register(). | |
831 | * | |
832 | * All kernel modules that support particular device types on a | |
833 | * visorbus bus are loaded. Each of these kernel modules calls | |
834 | * visorbus_register_visor_driver() in their init functions, passing a | |
835 | * visor_driver struct. visorbus_register_visor_driver() in turn calls | |
836 | * register_driver(&visor_driver.driver). This .driver member is | |
837 | * initialized with generic methods (like probe), whose sole responsibility | |
838 | * is to act as a broker for the real methods, which are within the | |
839 | * visor_driver struct. (This is the way the subclass behavior is | |
840 | * implemented, since visor_driver is essentially a subclass of the | |
841 | * generic driver.) Whenever a driver_register() happens, core bus code in | |
842 | * the kernel does (see device_attach() in drivers/base/dd.c): | |
843 | * | |
844 | * for each dev associated with the bus (the bus that driver is on) that | |
845 | * does not yet have a driver | |
846 | * if bus.match(dev,newdriver) == yes_matched ** .match specified | |
847 | * ** during bus_register(). | |
848 | * newdriver.probe(dev) ** for visor drivers, this will call | |
849 | * ** the generic driver.probe implemented in visorbus.c, | |
850 | * ** which in turn calls the probe specified within the | |
851 | * ** struct visor_driver (which was specified by the | |
852 | * ** actual device driver as part of | |
853 | * ** visorbus_register_visor_driver()). | |
854 | * | |
855 | * The above dance also happens when a new device appears. | |
856 | * So the question is, how are devices created within the system? | |
857 | * Basically, just call device_add(dev). See pci_bus_add_devices(). | |
858 | * pci_scan_device() shows an example of how to build a device struct. It | |
859 | * returns the newly-created struct to pci_scan_single_device(), who adds it | |
860 | * to the list of devices at PCIBUS.devices. That list of devices is what | |
861 | * is traversed by pci_bus_add_devices(). | |
862 | * | |
863 | */ | |
864 | int visorbus_register_visor_driver(struct visor_driver *drv) | |
865 | { | |
866 | int rc = 0; | |
867 | ||
6155a3cf BR |
868 | if (busreg_rc < 0) |
869 | return -ENODEV; /*can't register on a nonexistent bus*/ | |
870 | ||
3703987c EA |
871 | drv->driver.name = drv->name; |
872 | drv->driver.bus = &visorbus_type; | |
873 | drv->driver.probe = visordriver_probe_device; | |
874 | drv->driver.remove = visordriver_remove_device; | |
875 | drv->driver.owner = drv->owner; | |
876 | ||
877 | /* driver_register does this: | |
878 | * bus_add_driver(drv) | |
879 | * ->if (drv.bus) ** (bus_type) ** | |
880 | * driver_attach(drv) | |
881 | * for each dev with bus type of drv.bus | |
882 | * if (!dev.drv) ** no driver assigned yet ** | |
883 | * if (bus.match(dev,drv)) [visorbus_match] | |
884 | * dev.drv = drv | |
885 | * if (!drv.probe(dev)) [visordriver_probe_device] | |
886 | * dev.drv = NULL | |
887 | */ | |
888 | ||
889 | rc = driver_register(&drv->driver); | |
890 | if (rc < 0) | |
891 | return rc; | |
892 | rc = register_driver_attributes(drv); | |
418627dd DK |
893 | if (rc < 0) |
894 | driver_unregister(&drv->driver); | |
3703987c EA |
895 | return rc; |
896 | } | |
897 | EXPORT_SYMBOL_GPL(visorbus_register_visor_driver); | |
898 | ||
899 | /** A particular type of visor driver calls this function to unregister | |
900 | * the driver, i.e., within its module_exit function. | |
901 | */ | |
902 | void | |
903 | visorbus_unregister_visor_driver(struct visor_driver *drv) | |
904 | { | |
905 | unregister_driver_attributes(drv); | |
906 | driver_unregister(&drv->driver); | |
907 | } | |
908 | EXPORT_SYMBOL_GPL(visorbus_unregister_visor_driver); | |
909 | ||
910 | int | |
911 | visorbus_read_channel(struct visor_device *dev, unsigned long offset, | |
912 | void *dest, unsigned long nbytes) | |
913 | { | |
914 | return visorchannel_read(dev->visorchannel, offset, dest, nbytes); | |
915 | } | |
916 | EXPORT_SYMBOL_GPL(visorbus_read_channel); | |
917 | ||
918 | int | |
919 | visorbus_write_channel(struct visor_device *dev, unsigned long offset, | |
920 | void *src, unsigned long nbytes) | |
921 | { | |
922 | return visorchannel_write(dev->visorchannel, offset, src, nbytes); | |
923 | } | |
924 | EXPORT_SYMBOL_GPL(visorbus_write_channel); | |
925 | ||
926 | int | |
927 | visorbus_clear_channel(struct visor_device *dev, unsigned long offset, u8 ch, | |
928 | unsigned long nbytes) | |
929 | { | |
930 | return visorchannel_clear(dev->visorchannel, offset, ch, nbytes); | |
931 | } | |
932 | EXPORT_SYMBOL_GPL(visorbus_clear_channel); | |
933 | ||
934 | int | |
935 | visorbus_registerdevnode(struct visor_device *dev, | |
936 | const char *name, int major, int minor) | |
937 | { | |
938 | return devmajorminor_create_file(dev, name, major, minor); | |
939 | } | |
940 | EXPORT_SYMBOL_GPL(visorbus_registerdevnode); | |
941 | ||
942 | /** We don't really have a real interrupt, so for now we just call the | |
943 | * interrupt function periodically... | |
944 | */ | |
945 | void | |
946 | visorbus_enable_channel_interrupts(struct visor_device *dev) | |
947 | { | |
948 | dev_start_periodic_work(dev); | |
949 | } | |
950 | EXPORT_SYMBOL_GPL(visorbus_enable_channel_interrupts); | |
951 | ||
952 | void | |
953 | visorbus_disable_channel_interrupts(struct visor_device *dev) | |
954 | { | |
955 | dev_stop_periodic_work(dev); | |
956 | } | |
957 | EXPORT_SYMBOL_GPL(visorbus_disable_channel_interrupts); | |
958 | ||
959 | /** This is how everything starts from the device end. | |
960 | * This function is called when a channel first appears via a ControlVM | |
961 | * message. In response, this function allocates a visor_device to | |
962 | * correspond to the new channel, and attempts to connect it the appropriate | |
963 | * driver. If the appropriate driver is found, the visor_driver.probe() | |
964 | * function for that driver will be called, and will be passed the new | |
965 | * visor_device that we just created. | |
966 | * | |
967 | * It's ok if the appropriate driver is not yet loaded, because in that case | |
968 | * the new device struct will just stick around in the bus' list of devices. | |
969 | * When the appropriate driver calls visorbus_register_visor_driver(), the | |
970 | * visor_driver.probe() for the new driver will be called with the new | |
971 | * device. | |
972 | */ | |
973 | static int | |
a298bc0b | 974 | create_visor_device(struct visor_device *dev) |
3703987c EA |
975 | { |
976 | int rc = -1; | |
a298bc0b DZ |
977 | u32 chipset_bus_no = dev->chipset_bus_no; |
978 | u32 chipset_dev_no = dev->chipset_dev_no; | |
3703987c EA |
979 | |
980 | POSTCODE_LINUX_4(DEVICE_CREATE_ENTRY_PC, chipset_dev_no, chipset_bus_no, | |
981 | POSTCODE_SEVERITY_INFO); | |
3703987c | 982 | |
3703987c EA |
983 | sema_init(&dev->visordriver_callback_lock, 1); /* unlocked */ |
984 | dev->device.bus = &visorbus_type; | |
59fd2c8b | 985 | dev->device.groups = visorbus_channel_groups; |
3703987c EA |
986 | device_initialize(&dev->device); |
987 | dev->device.release = visorbus_release_device; | |
988 | /* keep a reference just for us (now 2) */ | |
989 | get_device(&dev->device); | |
3703987c EA |
990 | dev->periodic_work = |
991 | visor_periodic_work_create(POLLJIFFIES_NORMALCHANNEL, | |
992 | periodic_dev_workqueue, | |
993 | dev_periodic_work, | |
994 | dev, dev_name(&dev->device)); | |
995 | if (!dev->periodic_work) { | |
996 | POSTCODE_LINUX_3(DEVICE_CREATE_FAILURE_PC, chipset_dev_no, | |
997 | DIAG_SEVERITY_ERR); | |
998 | goto away; | |
999 | } | |
1000 | ||
1001 | /* bus_id must be a unique name with respect to this bus TYPE | |
1002 | * (NOT bus instance). That's why we need to include the bus | |
1003 | * number within the name. | |
1004 | */ | |
b4b598fd | 1005 | dev_set_name(&dev->device, "vbus%u:dev%u", |
3703987c EA |
1006 | chipset_bus_no, chipset_dev_no); |
1007 | ||
1008 | /* device_add does this: | |
1009 | * bus_add_device(dev) | |
1010 | * ->device_attach(dev) | |
1011 | * ->for each driver drv registered on the bus that dev is on | |
1012 | * if (dev.drv) ** device already has a driver ** | |
1013 | * ** not sure we could ever get here... ** | |
1014 | * else | |
1015 | * if (bus.match(dev,drv)) [visorbus_match] | |
1016 | * dev.drv = drv | |
1017 | * if (!drv.probe(dev)) [visordriver_probe_device] | |
1018 | * dev.drv = NULL | |
1019 | * | |
1020 | * Note that device_add does NOT fail if no driver failed to | |
1021 | * claim the device. The device will be linked onto | |
1022 | * bus_type.klist_devices regardless (use bus_for_each_dev). | |
1023 | */ | |
1024 | rc = device_add(&dev->device); | |
1025 | if (rc < 0) { | |
1026 | POSTCODE_LINUX_3(DEVICE_ADD_PC, chipset_bus_no, | |
1027 | DIAG_SEVERITY_ERR); | |
1028 | goto away; | |
1029 | } | |
1030 | ||
3703987c EA |
1031 | rc = register_devmajorminor_attributes(dev); |
1032 | if (rc < 0) { | |
1033 | POSTCODE_LINUX_3(DEVICE_REGISTER_FAILURE_PC, chipset_dev_no, | |
1034 | DIAG_SEVERITY_ERR); | |
a298bc0b | 1035 | goto away_register; |
3703987c EA |
1036 | } |
1037 | ||
a298bc0b DZ |
1038 | list_add_tail(&dev->list_all, &list_all_device_instances); |
1039 | return 0; | |
3703987c | 1040 | |
a298bc0b DZ |
1041 | away_register: |
1042 | device_unregister(&dev->device); | |
3703987c | 1043 | away: |
a298bc0b | 1044 | put_device(&dev->device); |
3703987c EA |
1045 | return rc; |
1046 | } | |
1047 | ||
1048 | static void | |
1049 | remove_visor_device(struct visor_device *dev) | |
1050 | { | |
1051 | list_del(&dev->list_all); | |
1052 | unregister_devmajorminor_attributes(dev); | |
3703987c EA |
1053 | put_device(&dev->device); |
1054 | device_unregister(&dev->device); | |
1055 | } | |
1056 | ||
3703987c EA |
1057 | static int |
1058 | get_vbus_header_info(struct visorchannel *chan, | |
1059 | struct spar_vbus_headerinfo *hdr_info) | |
1060 | { | |
1061 | int rc = -1; | |
1062 | ||
1063 | if (!SPAR_VBUS_CHANNEL_OK_CLIENT(visorchannel_get_header(chan))) | |
1064 | goto away; | |
1065 | if (visorchannel_read(chan, sizeof(struct channel_header), hdr_info, | |
1066 | sizeof(*hdr_info)) < 0) { | |
1067 | goto away; | |
1068 | } | |
1069 | if (hdr_info->struct_bytes < sizeof(struct spar_vbus_headerinfo)) | |
1070 | goto away; | |
1071 | if (hdr_info->device_info_struct_bytes < | |
1072 | sizeof(struct ultra_vbus_deviceinfo)) { | |
1073 | goto away; | |
1074 | } | |
1075 | rc = 0; | |
1076 | away: | |
1077 | return rc; | |
1078 | } | |
1079 | ||
1080 | /* Write the contents of <info> to the struct | |
1081 | * spar_vbus_channel_protocol.chp_info. */ | |
1082 | ||
1083 | static int | |
1084 | write_vbus_chp_info(struct visorchannel *chan, | |
1085 | struct spar_vbus_headerinfo *hdr_info, | |
1086 | struct ultra_vbus_deviceinfo *info) | |
1087 | { | |
1088 | int off = sizeof(struct channel_header) + hdr_info->chp_info_offset; | |
1089 | ||
1090 | if (hdr_info->chp_info_offset == 0) | |
216c3e2c | 1091 | return -1; |
3703987c EA |
1092 | |
1093 | if (visorchannel_write(chan, off, info, sizeof(*info)) < 0) | |
216c3e2c | 1094 | return -1; |
3703987c EA |
1095 | return 0; |
1096 | } | |
1097 | ||
1098 | /* Write the contents of <info> to the struct | |
1099 | * spar_vbus_channel_protocol.bus_info. */ | |
1100 | ||
1101 | static int | |
1102 | write_vbus_bus_info(struct visorchannel *chan, | |
1103 | struct spar_vbus_headerinfo *hdr_info, | |
1104 | struct ultra_vbus_deviceinfo *info) | |
1105 | { | |
1106 | int off = sizeof(struct channel_header) + hdr_info->bus_info_offset; | |
1107 | ||
1108 | if (hdr_info->bus_info_offset == 0) | |
216c3e2c | 1109 | return -1; |
3703987c EA |
1110 | |
1111 | if (visorchannel_write(chan, off, info, sizeof(*info)) < 0) | |
216c3e2c | 1112 | return -1; |
3703987c EA |
1113 | return 0; |
1114 | } | |
1115 | ||
1116 | /* Write the contents of <info> to the | |
1117 | * struct spar_vbus_channel_protocol.dev_info[<devix>]. | |
1118 | */ | |
1119 | static int | |
1120 | write_vbus_dev_info(struct visorchannel *chan, | |
1121 | struct spar_vbus_headerinfo *hdr_info, | |
1122 | struct ultra_vbus_deviceinfo *info, int devix) | |
1123 | { | |
1124 | int off = | |
1125 | (sizeof(struct channel_header) + hdr_info->dev_info_offset) + | |
1126 | (hdr_info->device_info_struct_bytes * devix); | |
1127 | ||
1128 | if (hdr_info->dev_info_offset == 0) | |
216c3e2c | 1129 | return -1; |
3703987c EA |
1130 | |
1131 | if (visorchannel_write(chan, off, info, sizeof(*info)) < 0) | |
216c3e2c | 1132 | return -1; |
3703987c EA |
1133 | return 0; |
1134 | } | |
1135 | ||
1136 | /* For a child device just created on a client bus, fill in | |
1137 | * information about the driver that is controlling this device into | |
1138 | * the the appropriate slot within the vbus channel of the bus | |
1139 | * instance. | |
1140 | */ | |
1141 | static void | |
1142 | fix_vbus_dev_info(struct visor_device *visordev) | |
1143 | { | |
1144 | int i; | |
d32517e3 | 1145 | struct visor_device *bdev; |
3703987c EA |
1146 | struct visor_driver *visordrv; |
1147 | int bus_no = visordev->chipset_bus_no; | |
1148 | int dev_no = visordev->chipset_dev_no; | |
1149 | struct ultra_vbus_deviceinfo dev_info; | |
1150 | const char *chan_type_name = NULL; | |
7726f813 | 1151 | struct spar_vbus_headerinfo *hdr_info; |
3703987c EA |
1152 | |
1153 | if (!visordev->device.driver) | |
216c3e2c | 1154 | return; |
3703987c | 1155 | |
7726f813 | 1156 | hdr_info = (struct spar_vbus_headerinfo *)visordev->vbus_hdr_info; |
d32517e3 DZ |
1157 | if (!hdr_info) |
1158 | return; | |
7726f813 | 1159 | |
d32517e3 DZ |
1160 | bdev = visorbus_get_device_by_id(bus_no, BUS_ROOT_DEVICE, NULL); |
1161 | if (!bdev) | |
1162 | return; | |
3703987c | 1163 | |
d32517e3 | 1164 | visordrv = to_visor_driver(visordev->device.driver); |
3703987c EA |
1165 | |
1166 | /* Within the list of device types (by GUID) that the driver | |
1167 | * says it supports, find out which one of those types matches | |
1168 | * the type of this device, so that we can include the device | |
1169 | * type name | |
1170 | */ | |
1171 | for (i = 0; visordrv->channel_types[i].name; i++) { | |
d5b3f1dc EA |
1172 | if (memcmp(&visordrv->channel_types[i].guid, |
1173 | &visordev->channel_type_guid, | |
1174 | sizeof(visordrv->channel_types[i].guid)) == 0) { | |
3703987c EA |
1175 | chan_type_name = visordrv->channel_types[i].name; |
1176 | break; | |
1177 | } | |
1178 | } | |
1179 | ||
1180 | bus_device_info_init(&dev_info, chan_type_name, | |
1181 | visordrv->name, visordrv->version, | |
1182 | visordrv->vertag); | |
d32517e3 | 1183 | write_vbus_dev_info(bdev->visorchannel, hdr_info, &dev_info, dev_no); |
3703987c EA |
1184 | |
1185 | /* Re-write bus+chipset info, because it is possible that this | |
1186 | * was previously written by our evil counterpart, virtpci. | |
1187 | */ | |
d32517e3 DZ |
1188 | write_vbus_chp_info(bdev->visorchannel, hdr_info, &chipset_driverinfo); |
1189 | write_vbus_bus_info(bdev->visorchannel, hdr_info, | |
1190 | &clientbus_driverinfo); | |
3703987c EA |
1191 | } |
1192 | ||
1193 | /** Create a device instance for the visor bus itself. | |
1194 | */ | |
d32517e3 DZ |
1195 | static int |
1196 | create_bus_instance(struct visor_device *dev) | |
3703987c | 1197 | { |
d32517e3 DZ |
1198 | int rc; |
1199 | int id = dev->chipset_bus_no; | |
7726f813 | 1200 | struct spar_vbus_headerinfo *hdr_info; |
3703987c EA |
1201 | |
1202 | POSTCODE_LINUX_2(BUS_CREATE_ENTRY_PC, POSTCODE_SEVERITY_INFO); | |
7726f813 DZ |
1203 | |
1204 | hdr_info = kzalloc(sizeof(*hdr_info), GFP_KERNEL); | |
1205 | if (!hdr_info) { | |
d32517e3 DZ |
1206 | rc = -1; |
1207 | goto away; | |
7726f813 DZ |
1208 | } |
1209 | ||
343506bf DZ |
1210 | dev_set_name(&dev->device, "visorbus%d", id); |
1211 | dev->device.bus = &visorbus_type; | |
1212 | dev->device.groups = visorbus_groups; | |
1213 | dev->device.release = visorbus_release_busdevice; | |
d32517e3 | 1214 | |
343506bf | 1215 | if (device_register(&dev->device) < 0) { |
3703987c EA |
1216 | POSTCODE_LINUX_3(DEVICE_CREATE_FAILURE_PC, id, |
1217 | POSTCODE_SEVERITY_ERR); | |
d32517e3 DZ |
1218 | rc = -1; |
1219 | goto away_mem; | |
3703987c | 1220 | } |
d32517e3 | 1221 | |
ee983d90 DZ |
1222 | if (get_vbus_header_info(dev->visorchannel, hdr_info) >= 0) { |
1223 | dev->vbus_hdr_info = (void *)hdr_info; | |
1224 | write_vbus_chp_info(dev->visorchannel, hdr_info, | |
1225 | &chipset_driverinfo); | |
1226 | write_vbus_bus_info(dev->visorchannel, hdr_info, | |
1227 | &clientbus_driverinfo); | |
b32c4997 | 1228 | } else { |
ee983d90 | 1229 | kfree(hdr_info); |
3703987c | 1230 | } |
3703987c | 1231 | bus_count++; |
343506bf | 1232 | list_add_tail(&dev->list_all, &list_all_bus_instances); |
343506bf | 1233 | dev_set_drvdata(&dev->device, dev); |
d32517e3 | 1234 | return 0; |
7726f813 | 1235 | |
7726f813 | 1236 | away_mem: |
d32517e3 | 1237 | kfree(hdr_info); |
3703987c EA |
1238 | away: |
1239 | return rc; | |
1240 | } | |
1241 | ||
1242 | /** Remove a device instance for the visor bus itself. | |
1243 | */ | |
1244 | static void | |
343506bf | 1245 | remove_bus_instance(struct visor_device *dev) |
3703987c EA |
1246 | { |
1247 | /* Note that this will result in the release method for | |
343506bf | 1248 | * dev->dev being called, which will call |
3703987c EA |
1249 | * visorbus_release_busdevice(). This has something to do with |
1250 | * the put_device() done in device_unregister(), but I have never | |
1251 | * successfully been able to trace thru the code to see where/how | |
1252 | * release() gets called. But I know it does. | |
1253 | */ | |
3703987c | 1254 | bus_count--; |
343506bf DZ |
1255 | if (dev->visorchannel) { |
1256 | visorchannel_destroy(dev->visorchannel); | |
1257 | dev->visorchannel = NULL; | |
3703987c | 1258 | } |
343506bf DZ |
1259 | kfree(dev->vbus_hdr_info); |
1260 | list_del(&dev->list_all); | |
1261 | device_unregister(&dev->device); | |
3703987c EA |
1262 | } |
1263 | ||
1264 | /** Create and register the one-and-only one instance of | |
1265 | * the visor bus type (visorbus_type). | |
1266 | */ | |
1267 | static int | |
1268 | create_bus_type(void) | |
1269 | { | |
6155a3cf BR |
1270 | busreg_rc = bus_register(&visorbus_type); |
1271 | return busreg_rc; | |
3703987c EA |
1272 | } |
1273 | ||
1274 | /** Remove the one-and-only one instance of the visor bus type (visorbus_type). | |
1275 | */ | |
1276 | static void | |
1277 | remove_bus_type(void) | |
1278 | { | |
3703987c EA |
1279 | bus_unregister(&visorbus_type); |
1280 | } | |
1281 | ||
1282 | /** Remove all child visor bus device instances. | |
1283 | */ | |
1284 | static void | |
1285 | remove_all_visor_devices(void) | |
1286 | { | |
1287 | struct list_head *listentry, *listtmp; | |
1288 | ||
1289 | list_for_each_safe(listentry, listtmp, &list_all_device_instances) { | |
1290 | struct visor_device *dev = list_entry(listentry, | |
1291 | struct visor_device, | |
1292 | list_all); | |
1293 | remove_visor_device(dev); | |
1294 | } | |
1295 | } | |
1296 | ||
3703987c | 1297 | static void |
d32517e3 | 1298 | chipset_bus_create(struct visor_device *dev) |
3703987c | 1299 | { |
d32517e3 DZ |
1300 | int rc; |
1301 | u32 bus_no = dev->chipset_bus_no; | |
3703987c EA |
1302 | |
1303 | POSTCODE_LINUX_3(BUS_CREATE_ENTRY_PC, bus_no, POSTCODE_SEVERITY_INFO); | |
d32517e3 | 1304 | rc = create_bus_instance(dev); |
3703987c | 1305 | POSTCODE_LINUX_3(BUS_CREATE_EXIT_PC, bus_no, POSTCODE_SEVERITY_INFO); |
d32517e3 DZ |
1306 | |
1307 | if (rc < 0) | |
3703987c EA |
1308 | POSTCODE_LINUX_3(BUS_CREATE_FAILURE_PC, bus_no, |
1309 | POSTCODE_SEVERITY_ERR); | |
d32517e3 DZ |
1310 | else |
1311 | POSTCODE_LINUX_3(CHIPSET_INIT_SUCCESS_PC, bus_no, | |
1312 | POSTCODE_SEVERITY_INFO); | |
1313 | ||
3703987c | 1314 | if (chipset_responders.bus_create) |
d32517e3 | 1315 | (*chipset_responders.bus_create) (dev, rc); |
3703987c EA |
1316 | } |
1317 | ||
1318 | static void | |
d32517e3 | 1319 | chipset_bus_destroy(struct visor_device *dev) |
3703987c | 1320 | { |
343506bf | 1321 | remove_bus_instance(dev); |
3703987c | 1322 | if (chipset_responders.bus_destroy) |
d32517e3 | 1323 | (*chipset_responders.bus_destroy)(dev, 0); |
3703987c EA |
1324 | } |
1325 | ||
1326 | static void | |
a298bc0b | 1327 | chipset_device_create(struct visor_device *dev_info) |
3703987c | 1328 | { |
3703987c | 1329 | int rc = -1; |
a298bc0b DZ |
1330 | u32 bus_no = dev_info->chipset_bus_no; |
1331 | u32 dev_no = dev_info->chipset_dev_no; | |
3703987c EA |
1332 | |
1333 | POSTCODE_LINUX_4(DEVICE_CREATE_ENTRY_PC, dev_no, bus_no, | |
1334 | POSTCODE_SEVERITY_INFO); | |
1335 | ||
a298bc0b | 1336 | rc = create_visor_device(dev_info); |
86ea8acc DK |
1337 | if (chipset_responders.device_create) |
1338 | chipset_responders.device_create(dev_info, rc); | |
1339 | ||
1340 | if (rc < 0) | |
3703987c EA |
1341 | POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, dev_no, bus_no, |
1342 | POSTCODE_SEVERITY_ERR); | |
86ea8acc DK |
1343 | else |
1344 | POSTCODE_LINUX_4(DEVICE_CREATE_SUCCESS_PC, dev_no, bus_no, | |
1345 | POSTCODE_SEVERITY_INFO); | |
3703987c EA |
1346 | } |
1347 | ||
1348 | static void | |
a298bc0b | 1349 | chipset_device_destroy(struct visor_device *dev_info) |
3703987c | 1350 | { |
a298bc0b | 1351 | remove_visor_device(dev_info); |
3703987c EA |
1352 | |
1353 | if (chipset_responders.device_destroy) | |
a298bc0b | 1354 | (*chipset_responders.device_destroy) (dev_info, 0); |
3703987c EA |
1355 | } |
1356 | ||
1357 | /* This is the callback function specified for a function driver, to | |
1358 | * be called when a pending "pause device" operation has been | |
1359 | * completed. | |
1360 | */ | |
1361 | static void | |
a298bc0b | 1362 | pause_state_change_complete(struct visor_device *dev, int status) |
3703987c EA |
1363 | { |
1364 | if (!dev->pausing) | |
216c3e2c | 1365 | return; |
3703987c | 1366 | |
779d0752 | 1367 | dev->pausing = false; |
3703987c | 1368 | if (!chipset_responders.device_pause) /* this can never happen! */ |
216c3e2c | 1369 | return; |
3703987c EA |
1370 | |
1371 | /* Notify the chipset driver that the pause is complete, which | |
1372 | * will presumably want to send some sort of response to the | |
1373 | * initiator. */ | |
a298bc0b | 1374 | (*chipset_responders.device_pause) (dev, status); |
3703987c EA |
1375 | } |
1376 | ||
1377 | /* This is the callback function specified for a function driver, to | |
1378 | * be called when a pending "resume device" operation has been | |
1379 | * completed. | |
1380 | */ | |
1381 | static void | |
a298bc0b | 1382 | resume_state_change_complete(struct visor_device *dev, int status) |
3703987c EA |
1383 | { |
1384 | if (!dev->resuming) | |
216c3e2c | 1385 | return; |
3703987c | 1386 | |
779d0752 | 1387 | dev->resuming = false; |
3703987c | 1388 | if (!chipset_responders.device_resume) /* this can never happen! */ |
216c3e2c | 1389 | return; |
3703987c EA |
1390 | |
1391 | /* Notify the chipset driver that the resume is complete, | |
1392 | * which will presumably want to send some sort of response to | |
1393 | * the initiator. */ | |
a298bc0b | 1394 | (*chipset_responders.device_resume) (dev, status); |
3703987c EA |
1395 | } |
1396 | ||
1397 | /* Tell the subordinate function driver for a specific device to pause | |
1398 | * or resume that device. Result is returned asynchronously via a | |
1399 | * callback function. | |
1400 | */ | |
1401 | static void | |
a298bc0b | 1402 | initiate_chipset_device_pause_resume(struct visor_device *dev, bool is_pause) |
3703987c | 1403 | { |
3703987c EA |
1404 | int rc = -1, x; |
1405 | struct visor_driver *drv = NULL; | |
a298bc0b | 1406 | void (*notify_func)(struct visor_device *dev, int response) = NULL; |
3703987c EA |
1407 | |
1408 | if (is_pause) | |
1409 | notify_func = chipset_responders.device_pause; | |
1410 | else | |
1411 | notify_func = chipset_responders.device_resume; | |
1412 | if (!notify_func) | |
216c3e2c | 1413 | goto away; |
3703987c | 1414 | |
3703987c EA |
1415 | drv = to_visor_driver(dev->device.driver); |
1416 | if (!drv) | |
216c3e2c | 1417 | goto away; |
3703987c EA |
1418 | |
1419 | if (dev->pausing || dev->resuming) | |
216c3e2c | 1420 | goto away; |
3703987c EA |
1421 | |
1422 | /* Note that even though both drv->pause() and drv->resume | |
1423 | * specify a callback function, it is NOT necessary for us to | |
1424 | * increment our local module usage count. Reason is, there | |
1425 | * is already a linkage dependency between child function | |
1426 | * drivers and visorbus, so it is already IMPOSSIBLE to unload | |
1427 | * visorbus while child function drivers are still running. | |
1428 | */ | |
1429 | if (is_pause) { | |
1430 | if (!drv->pause) | |
216c3e2c | 1431 | goto away; |
3703987c | 1432 | |
779d0752 | 1433 | dev->pausing = true; |
a298bc0b | 1434 | x = drv->pause(dev, pause_state_change_complete); |
3703987c EA |
1435 | } else { |
1436 | /* This should be done at BUS resume time, but an | |
1437 | * existing problem prevents us from ever getting a bus | |
1438 | * resume... This hack would fail to work should we | |
1439 | * ever have a bus that contains NO devices, since we | |
1440 | * would never even get here in that case. */ | |
1441 | fix_vbus_dev_info(dev); | |
1442 | if (!drv->resume) | |
216c3e2c | 1443 | goto away; |
3703987c | 1444 | |
779d0752 | 1445 | dev->resuming = true; |
a298bc0b | 1446 | x = drv->resume(dev, resume_state_change_complete); |
3703987c EA |
1447 | } |
1448 | if (x < 0) { | |
1449 | if (is_pause) | |
779d0752 | 1450 | dev->pausing = false; |
3703987c | 1451 | else |
779d0752 | 1452 | dev->resuming = false; |
3703987c EA |
1453 | goto away; |
1454 | } | |
1455 | rc = 0; | |
1456 | away: | |
1457 | if (rc < 0) { | |
1458 | if (notify_func) | |
216c3e2c | 1459 | (*notify_func)(dev, rc); |
3703987c EA |
1460 | } |
1461 | } | |
1462 | ||
1463 | static void | |
a298bc0b | 1464 | chipset_device_pause(struct visor_device *dev_info) |
3703987c | 1465 | { |
b4b598fd | 1466 | initiate_chipset_device_pause_resume(dev_info, true); |
3703987c EA |
1467 | } |
1468 | ||
1469 | static void | |
a298bc0b | 1470 | chipset_device_resume(struct visor_device *dev_info) |
3703987c | 1471 | { |
b4b598fd | 1472 | initiate_chipset_device_pause_resume(dev_info, false); |
3703987c EA |
1473 | } |
1474 | ||
1475 | struct channel_size_info { | |
1476 | uuid_le guid; | |
1477 | unsigned long min_size; | |
1478 | unsigned long max_size; | |
1479 | }; | |
1480 | ||
55c67dca | 1481 | int |
3703987c EA |
1482 | visorbus_init(void) |
1483 | { | |
1484 | int rc = 0; | |
1485 | ||
1486 | POSTCODE_LINUX_3(DRIVER_ENTRY_PC, rc, POSTCODE_SEVERITY_INFO); | |
1487 | bus_device_info_init(&clientbus_driverinfo, | |
46168810 | 1488 | "clientbus", "visorbus", |
3703987c EA |
1489 | VERSION, NULL); |
1490 | ||
3703987c EA |
1491 | rc = create_bus_type(); |
1492 | if (rc < 0) { | |
1493 | POSTCODE_LINUX_2(BUS_CREATE_ENTRY_PC, DIAG_SEVERITY_ERR); | |
1494 | goto away; | |
1495 | } | |
1496 | ||
1497 | periodic_dev_workqueue = create_singlethread_workqueue("visorbus_dev"); | |
1498 | if (!periodic_dev_workqueue) { | |
1499 | POSTCODE_LINUX_2(CREATE_WORKQUEUE_PC, DIAG_SEVERITY_ERR); | |
1500 | rc = -ENOMEM; | |
1501 | goto away; | |
1502 | } | |
1503 | ||
1504 | /* This enables us to receive notifications when devices appear for | |
1505 | * which this service partition is to be a server for. | |
1506 | */ | |
4da3336c DK |
1507 | visorchipset_register_busdev(&chipset_notifiers, |
1508 | &chipset_responders, | |
1509 | &chipset_driverinfo); | |
3703987c EA |
1510 | |
1511 | rc = 0; | |
1512 | ||
1513 | away: | |
1514 | if (rc) | |
216c3e2c CJ |
1515 | POSTCODE_LINUX_3(CHIPSET_INIT_FAILURE_PC, rc, |
1516 | POSTCODE_SEVERITY_ERR); | |
3703987c EA |
1517 | return rc; |
1518 | } | |
1519 | ||
c79b28f7 | 1520 | void |
3703987c EA |
1521 | visorbus_exit(void) |
1522 | { | |
1523 | struct list_head *listentry, *listtmp; | |
1524 | ||
4da3336c | 1525 | visorchipset_register_busdev(NULL, NULL, NULL); |
3703987c EA |
1526 | remove_all_visor_devices(); |
1527 | ||
1528 | flush_workqueue(periodic_dev_workqueue); /* better not be any work! */ | |
1529 | destroy_workqueue(periodic_dev_workqueue); | |
1530 | periodic_dev_workqueue = NULL; | |
1531 | ||
1532 | if (periodic_test_workqueue) { | |
1533 | cancel_delayed_work(&periodic_work); | |
1534 | flush_workqueue(periodic_test_workqueue); | |
1535 | destroy_workqueue(periodic_test_workqueue); | |
1536 | periodic_test_workqueue = NULL; | |
1537 | } | |
1538 | ||
1539 | list_for_each_safe(listentry, listtmp, &list_all_bus_instances) { | |
343506bf | 1540 | struct visor_device *dev = list_entry(listentry, |
216c3e2c CJ |
1541 | struct visor_device, |
1542 | list_all); | |
343506bf | 1543 | remove_bus_instance(dev); |
3703987c EA |
1544 | } |
1545 | remove_bus_type(); | |
1546 | } | |
1547 | ||
1548 | module_param_named(debug, visorbus_debug, int, S_IRUGO); | |
1549 | MODULE_PARM_DESC(visorbus_debug, "1 to debug"); | |
3703987c EA |
1550 | |
1551 | module_param_named(forcematch, visorbus_forcematch, int, S_IRUGO); | |
1552 | MODULE_PARM_DESC(visorbus_forcematch, | |
1553 | "1 to force a successful dev <--> drv match"); | |
3703987c EA |
1554 | |
1555 | module_param_named(forcenomatch, visorbus_forcenomatch, int, S_IRUGO); | |
1556 | MODULE_PARM_DESC(visorbus_forcenomatch, | |
1557 | "1 to force an UNsuccessful dev <--> drv match"); | |
3703987c | 1558 | |
3703987c EA |
1559 | module_param_named(debugref, visorbus_debugref, int, S_IRUGO); |
1560 | MODULE_PARM_DESC(visorbus_debugref, "1 to debug reference counting"); |