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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 PB |
30 | /* module parameters */ |
31 | int visorbus_debug; | |
32 | int visorbus_forcematch; | |
33 | int visorbus_forcenomatch; | |
34 | #define MAXDEVICETEST 4 | |
35 | int visorbus_devicetest; | |
36 | int visorbus_debugref; | |
4b78000e PB |
37 | #define SERIALLOOPBACKCHANADDR (100 * 1024 * 1024) |
38 | ||
39 | /** This is the private data that we store for each bus device instance. | |
40 | */ | |
41 | struct visorbus_devdata { | |
42 | int devno; /* this is the chipset busNo */ | |
43 | struct list_head list_all; | |
03274d38 | 44 | struct device dev; |
4b78000e PB |
45 | struct kobject kobj; |
46 | struct visorchannel *chan; /* channel area for bus itself */ | |
47 | bool vbus_valid; | |
48 | struct spar_vbus_headerinfo vbus_hdr_info; | |
49 | }; | |
50 | ||
3703987c EA |
51 | #define CURRENT_FILE_PC VISOR_BUS_PC_visorbus_main_c |
52 | #define POLLJIFFIES_TESTWORK 100 | |
53 | #define POLLJIFFIES_NORMALCHANNEL 10 | |
54 | ||
55 | static int visorbus_uevent(struct device *xdev, struct kobj_uevent_env *env); | |
56 | static int visorbus_match(struct device *xdev, struct device_driver *xdrv); | |
57 | static void fix_vbus_dev_info(struct visor_device *visordev); | |
58 | ||
68b04f1f DZ |
59 | /* BUS type attributes |
60 | * | |
61 | * define & implement display of bus attributes under | |
62 | * /sys/bus/visorbus. | |
63 | * | |
64 | */ | |
65 | ||
66 | static ssize_t version_show(struct bus_type *bus, char *buf) | |
67 | { | |
68 | return snprintf(buf, PAGE_SIZE, "%s\n", VERSION); | |
69 | } | |
70 | ||
71 | static BUS_ATTR_RO(version); | |
72 | ||
73 | static struct attribute *visorbus_bus_attrs[] = { | |
74 | &bus_attr_version.attr, | |
75 | NULL, | |
76 | }; | |
77 | ||
78 | static const struct attribute_group visorbus_bus_group = { | |
79 | .attrs = visorbus_bus_attrs, | |
80 | }; | |
81 | ||
82 | const struct attribute_group *visorbus_bus_groups[] = { | |
83 | &visorbus_bus_group, | |
84 | NULL, | |
85 | }; | |
86 | ||
87 | ||
3703987c EA |
88 | /** This describes the TYPE of bus. |
89 | * (Don't confuse this with an INSTANCE of the bus.) | |
90 | */ | |
1fb3016e | 91 | struct bus_type visorbus_type = { |
3703987c EA |
92 | .name = "visorbus", |
93 | .match = visorbus_match, | |
94 | .uevent = visorbus_uevent, | |
68b04f1f | 95 | .bus_groups = visorbus_bus_groups, |
3703987c EA |
96 | }; |
97 | ||
98 | static struct delayed_work periodic_work; | |
99 | ||
100 | /* YES, we need 2 workqueues. | |
101 | * The reason is, workitems on the test queue may need to cancel | |
102 | * workitems on the other queue. You will be in for trouble if you try to | |
103 | * do this with workitems queued on the same workqueue. | |
104 | */ | |
105 | static struct workqueue_struct *periodic_test_workqueue; | |
106 | static struct workqueue_struct *periodic_dev_workqueue; | |
107 | static long long bus_count; /** number of bus instances */ | |
108 | static long long total_devices_created; | |
109 | /** ever-increasing */ | |
110 | ||
3032aedd DZ |
111 | static void chipset_bus_create(struct visorchipset_bus_info *bus_info); |
112 | static void chipset_bus_destroy(struct visorchipset_bus_info *bus_info); | |
b4b598fd DZ |
113 | static void chipset_device_create(struct visorchipset_device_info *dev_info); |
114 | static void chipset_device_destroy(struct visorchipset_device_info *dev_info); | |
115 | static void chipset_device_pause(struct visorchipset_device_info *dev_info); | |
116 | static void chipset_device_resume(struct visorchipset_device_info *dev_info); | |
3703987c EA |
117 | |
118 | /** These functions are implemented herein, and are called by the chipset | |
119 | * driver to notify us about specific events. | |
120 | */ | |
121 | static struct visorchipset_busdev_notifiers chipset_notifiers = { | |
122 | .bus_create = chipset_bus_create, | |
123 | .bus_destroy = chipset_bus_destroy, | |
124 | .device_create = chipset_device_create, | |
125 | .device_destroy = chipset_device_destroy, | |
126 | .device_pause = chipset_device_pause, | |
127 | .device_resume = chipset_device_resume, | |
128 | }; | |
129 | ||
130 | /** These functions are implemented in the chipset driver, and we call them | |
131 | * herein when we want to acknowledge a specific event. | |
132 | */ | |
133 | static struct visorchipset_busdev_responders chipset_responders; | |
134 | ||
135 | /* filled in with info about parent chipset driver when we register with it */ | |
136 | static struct ultra_vbus_deviceinfo chipset_driverinfo; | |
137 | /* filled in with info about this driver, wrt it servicing client busses */ | |
138 | static struct ultra_vbus_deviceinfo clientbus_driverinfo; | |
139 | ||
140 | /** list of visorbus_devdata structs, linked via .list_all */ | |
141 | static LIST_HEAD(list_all_bus_instances); | |
142 | /** list of visor_device structs, linked via .list_all */ | |
143 | static LIST_HEAD(list_all_device_instances); | |
144 | ||
145 | static int | |
146 | visorbus_uevent(struct device *xdev, struct kobj_uevent_env *env) | |
147 | { | |
148 | if (add_uevent_var(env, "VERSION=%s", VERSION)) | |
149 | return -ENOMEM; | |
150 | return 0; | |
151 | } | |
152 | ||
153 | /* This is called automatically upon adding a visor_device (device_add), or | |
154 | * adding a visor_driver (visorbus_register_visor_driver), and returns 1 iff the | |
155 | * provided driver can control the specified device. | |
156 | */ | |
157 | static int | |
158 | visorbus_match(struct device *xdev, struct device_driver *xdrv) | |
159 | { | |
160 | uuid_le channel_type; | |
161 | int rc = 0; | |
162 | int i; | |
163 | struct visor_device *dev; | |
164 | struct visor_driver *drv; | |
165 | ||
166 | dev = to_visor_device(xdev); | |
167 | drv = to_visor_driver(xdrv); | |
168 | channel_type = visorchannel_get_uuid(dev->visorchannel); | |
169 | if (visorbus_forcematch) { | |
170 | rc = 1; | |
171 | goto away; | |
172 | } | |
173 | if (visorbus_forcenomatch) | |
174 | goto away; | |
175 | ||
176 | if (!drv->channel_types) | |
177 | goto away; | |
178 | for (i = 0; | |
179 | (uuid_le_cmp(drv->channel_types[i].guid, NULL_UUID_LE) != 0) || | |
180 | (drv->channel_types[i].name); | |
181 | i++) | |
182 | if (uuid_le_cmp(drv->channel_types[i].guid, | |
183 | channel_type) == 0) { | |
184 | rc = i + 1; | |
185 | goto away; | |
186 | } | |
187 | away: | |
188 | return rc; | |
189 | } | |
190 | ||
191 | /** This is called when device_unregister() is called for the bus device | |
192 | * instance, after all other tasks involved with destroying the device | |
193 | * are complete. | |
194 | */ | |
195 | static void | |
196 | visorbus_release_busdevice(struct device *xdev) | |
197 | { | |
198 | struct visorbus_devdata *devdata = dev_get_drvdata(xdev); | |
199 | ||
200 | dev_set_drvdata(xdev, NULL); | |
201 | kfree(devdata); | |
202 | kfree(xdev); | |
203 | } | |
204 | ||
205 | /** This is called when device_unregister() is called for each child | |
206 | * device instance. | |
207 | */ | |
208 | static void | |
209 | visorbus_release_device(struct device *xdev) | |
210 | { | |
211 | struct visor_device *dev = to_visor_device(xdev); | |
212 | ||
213 | if (dev->periodic_work) { | |
214 | visor_periodic_work_destroy(dev->periodic_work); | |
215 | dev->periodic_work = NULL; | |
216 | } | |
217 | if (dev->visorchannel) { | |
218 | visorchannel_destroy(dev->visorchannel); | |
219 | dev->visorchannel = NULL; | |
220 | } | |
221 | kfree(dev); | |
222 | } | |
223 | ||
32710457 PB |
224 | /* Implement publishing of device node attributes under: |
225 | * | |
226 | * /sys/bus/visorbus<x>/dev<y>/devmajorminor | |
227 | * | |
228 | */ | |
229 | ||
230 | #define to_devmajorminor_attr(_attr) \ | |
231 | container_of(_attr, struct devmajorminor_attribute, attr) | |
232 | #define to_visor_device_from_kobjdevmajorminor(obj) \ | |
233 | container_of(obj, struct visor_device, kobjdevmajorminor) | |
234 | ||
235 | struct devmajorminor_attribute { | |
236 | struct attribute attr; | |
237 | int slot; | |
238 | ssize_t (*show)(struct visor_device *, int slot, char *buf); | |
239 | ssize_t (*store)(struct visor_device *, int slot, const char *buf, | |
240 | size_t count); | |
241 | }; | |
242 | ||
243 | static ssize_t DEVMAJORMINOR_ATTR(struct visor_device *dev, int slot, char *buf) | |
244 | { | |
245 | int maxdevnodes = ARRAY_SIZE(dev->devnodes) / sizeof(dev->devnodes[0]); | |
246 | ||
247 | if (slot < 0 || slot >= maxdevnodes) | |
248 | return 0; | |
249 | return snprintf(buf, PAGE_SIZE, "%d:%d\n", | |
250 | dev->devnodes[slot].major, dev->devnodes[slot].minor); | |
251 | } | |
252 | ||
253 | static ssize_t | |
254 | devmajorminor_attr_show(struct kobject *kobj, struct attribute *attr, char *buf) | |
255 | { | |
256 | struct devmajorminor_attribute *devmajorminor_attr = | |
257 | to_devmajorminor_attr(attr); | |
258 | struct visor_device *dev = to_visor_device_from_kobjdevmajorminor(kobj); | |
259 | ssize_t ret = 0; | |
260 | ||
261 | if (devmajorminor_attr->show) | |
262 | ret = devmajorminor_attr->show(dev, | |
263 | devmajorminor_attr->slot, buf); | |
264 | return ret; | |
265 | } | |
266 | ||
267 | static ssize_t | |
268 | devmajorminor_attr_store(struct kobject *kobj, | |
269 | struct attribute *attr, const char *buf, size_t count) | |
270 | { | |
271 | struct devmajorminor_attribute *devmajorminor_attr = | |
272 | to_devmajorminor_attr(attr); | |
273 | struct visor_device *dev = to_visor_device_from_kobjdevmajorminor(kobj); | |
274 | ssize_t ret = 0; | |
275 | ||
276 | if (devmajorminor_attr->store) | |
277 | ret = devmajorminor_attr->store(dev, | |
278 | devmajorminor_attr->slot, | |
279 | buf, count); | |
280 | return ret; | |
281 | } | |
282 | ||
283 | static int register_devmajorminor_attributes(struct visor_device *dev); | |
284 | ||
285 | int | |
286 | devmajorminor_create_file(struct visor_device *dev, const char *name, | |
287 | int major, int minor) | |
288 | { | |
289 | int maxdevnodes = ARRAY_SIZE(dev->devnodes) / sizeof(dev->devnodes[0]); | |
290 | struct devmajorminor_attribute *myattr = NULL; | |
291 | int x = -1, rc = 0, slot = -1; | |
292 | ||
293 | register_devmajorminor_attributes(dev); | |
294 | for (slot = 0; slot < maxdevnodes; slot++) | |
295 | if (!dev->devnodes[slot].attr) | |
296 | break; | |
297 | if (slot == maxdevnodes) { | |
298 | rc = -ENOMEM; | |
299 | goto away; | |
300 | } | |
301 | myattr = kmalloc(sizeof(*myattr), GFP_KERNEL); | |
302 | if (!myattr) { | |
303 | rc = -ENOMEM; | |
304 | goto away; | |
305 | } | |
306 | memset(myattr, 0, sizeof(struct devmajorminor_attribute)); | |
307 | myattr->show = DEVMAJORMINOR_ATTR; | |
308 | myattr->store = NULL; | |
309 | myattr->slot = slot; | |
310 | myattr->attr.name = name; | |
311 | myattr->attr.mode = S_IRUGO; | |
312 | dev->devnodes[slot].attr = myattr; | |
313 | dev->devnodes[slot].major = major; | |
314 | dev->devnodes[slot].minor = minor; | |
315 | x = sysfs_create_file(&dev->kobjdevmajorminor, &myattr->attr); | |
316 | if (x < 0) { | |
317 | rc = x; | |
318 | goto away; | |
319 | } | |
320 | kobject_uevent(&dev->device.kobj, KOBJ_ONLINE); | |
321 | away: | |
322 | if (rc < 0) { | |
323 | kfree(myattr); | |
324 | myattr = NULL; | |
325 | dev->devnodes[slot].attr = NULL; | |
326 | } | |
327 | return rc; | |
328 | } | |
329 | ||
330 | void | |
331 | devmajorminor_remove_file(struct visor_device *dev, int slot) | |
332 | { | |
333 | int maxdevnodes = ARRAY_SIZE(dev->devnodes) / sizeof(dev->devnodes[0]); | |
334 | struct devmajorminor_attribute *myattr = NULL; | |
335 | ||
336 | if (slot < 0 || slot >= maxdevnodes) | |
337 | return; | |
338 | myattr = (struct devmajorminor_attribute *)(dev->devnodes[slot].attr); | |
339 | if (myattr) | |
340 | return; | |
341 | sysfs_remove_file(&dev->kobjdevmajorminor, &myattr->attr); | |
342 | kobject_uevent(&dev->device.kobj, KOBJ_OFFLINE); | |
343 | dev->devnodes[slot].attr = NULL; | |
344 | kfree(myattr); | |
345 | } | |
346 | ||
347 | void | |
348 | devmajorminor_remove_all_files(struct visor_device *dev) | |
349 | { | |
350 | int i = 0; | |
351 | int maxdevnodes = ARRAY_SIZE(dev->devnodes) / sizeof(dev->devnodes[0]); | |
352 | ||
353 | for (i = 0; i < maxdevnodes; i++) | |
354 | devmajorminor_remove_file(dev, i); | |
355 | } | |
356 | ||
357 | static const struct sysfs_ops devmajorminor_sysfs_ops = { | |
358 | .show = devmajorminor_attr_show, | |
359 | .store = devmajorminor_attr_store, | |
360 | }; | |
361 | ||
362 | static struct kobj_type devmajorminor_kobj_type = { | |
363 | .sysfs_ops = &devmajorminor_sysfs_ops | |
364 | }; | |
365 | ||
366 | static int | |
367 | register_devmajorminor_attributes(struct visor_device *dev) | |
368 | { | |
369 | int rc = 0, x = 0; | |
370 | ||
371 | if (dev->kobjdevmajorminor.parent) | |
372 | goto away; /* already registered */ | |
373 | x = kobject_init_and_add(&dev->kobjdevmajorminor, | |
374 | &devmajorminor_kobj_type, &dev->device.kobj, | |
375 | "devmajorminor"); | |
376 | if (x < 0) { | |
377 | rc = x; | |
378 | goto away; | |
379 | } | |
380 | ||
381 | kobject_uevent(&dev->kobjdevmajorminor, KOBJ_ADD); | |
382 | ||
383 | away: | |
384 | return rc; | |
385 | } | |
386 | ||
387 | void | |
388 | unregister_devmajorminor_attributes(struct visor_device *dev) | |
389 | { | |
390 | if (!dev->kobjdevmajorminor.parent) | |
391 | return; /* already unregistered */ | |
392 | devmajorminor_remove_all_files(dev); | |
393 | ||
394 | kobject_del(&dev->kobjdevmajorminor); | |
395 | kobject_put(&dev->kobjdevmajorminor); | |
396 | dev->kobjdevmajorminor.parent = NULL; | |
397 | } | |
398 | ||
826b6a0f PB |
399 | /* begin implementation of specific channel attributes to appear under |
400 | * /sys/bus/visorbus<x>/dev<y>/channel | |
401 | */ | |
79573162 DZ |
402 | static ssize_t physaddr_show(struct device *dev, struct device_attribute *attr, |
403 | char *buf) | |
826b6a0f | 404 | { |
79573162 DZ |
405 | struct visor_device *vdev = to_visor_device(dev); |
406 | ||
407 | if (!vdev->visorchannel) | |
826b6a0f PB |
408 | return 0; |
409 | return snprintf(buf, PAGE_SIZE, "0x%Lx\n", | |
79573162 | 410 | visorchannel_get_physaddr(vdev->visorchannel)); |
826b6a0f PB |
411 | } |
412 | ||
79573162 DZ |
413 | static ssize_t nbytes_show(struct device *dev, struct device_attribute *attr, |
414 | char *buf) | |
826b6a0f | 415 | { |
79573162 DZ |
416 | struct visor_device *vdev = to_visor_device(dev); |
417 | ||
418 | if (!vdev->visorchannel) | |
826b6a0f PB |
419 | return 0; |
420 | return snprintf(buf, PAGE_SIZE, "0x%lx\n", | |
79573162 | 421 | visorchannel_get_nbytes(vdev->visorchannel)); |
826b6a0f PB |
422 | } |
423 | ||
79573162 DZ |
424 | static ssize_t clientpartition_show(struct device *dev, |
425 | struct device_attribute *attr, char *buf) | |
426 | { | |
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_clientpartition(vdev->visorchannel)); |
826b6a0f PB |
433 | } |
434 | ||
79573162 DZ |
435 | static ssize_t typeguid_show(struct device *dev, struct device_attribute *attr, |
436 | char *buf) | |
826b6a0f | 437 | { |
79573162 | 438 | struct visor_device *vdev = to_visor_device(dev); |
826b6a0f PB |
439 | char s[99]; |
440 | ||
79573162 | 441 | if (!vdev->visorchannel) |
826b6a0f PB |
442 | return 0; |
443 | return snprintf(buf, PAGE_SIZE, "%s\n", | |
79573162 | 444 | visorchannel_id(vdev->visorchannel, s)); |
826b6a0f PB |
445 | } |
446 | ||
79573162 DZ |
447 | static ssize_t zoneguid_show(struct device *dev, struct device_attribute *attr, |
448 | char *buf) | |
826b6a0f | 449 | { |
79573162 | 450 | struct visor_device *vdev = to_visor_device(dev); |
826b6a0f PB |
451 | char s[99]; |
452 | ||
79573162 | 453 | if (!vdev->visorchannel) |
826b6a0f PB |
454 | return 0; |
455 | return snprintf(buf, PAGE_SIZE, "%s\n", | |
79573162 | 456 | visorchannel_zoneid(vdev->visorchannel, s)); |
826b6a0f PB |
457 | } |
458 | ||
79573162 DZ |
459 | static ssize_t typename_show(struct device *dev, struct device_attribute *attr, |
460 | char *buf) | |
826b6a0f | 461 | { |
79573162 | 462 | struct visor_device *vdev = to_visor_device(dev); |
826b6a0f | 463 | int i = 0; |
79573162 DZ |
464 | struct bus_type *xbus = dev->bus; |
465 | struct device_driver *xdrv = dev->driver; | |
826b6a0f PB |
466 | struct visor_driver *drv = NULL; |
467 | ||
79573162 | 468 | if (!vdev->visorchannel || !xbus || !xdrv) |
826b6a0f | 469 | return 0; |
79573162 | 470 | i = xbus->match(dev, xdrv); |
826b6a0f PB |
471 | if (!i) |
472 | return 0; | |
473 | drv = to_visor_driver(xdrv); | |
474 | return snprintf(buf, PAGE_SIZE, "%s\n", drv->channel_types[i - 1].name); | |
475 | } | |
476 | ||
79573162 DZ |
477 | static ssize_t dump_show(struct device *dev, struct device_attribute *attr, |
478 | char *buf) | |
826b6a0f | 479 | { |
826b6a0f | 480 | /* TODO: replace this with debugfs code |
79573162 DZ |
481 | struct visor_device *vdev = to_visor_device(dev); |
482 | int count = 0; | |
826b6a0f | 483 | struct seq_file *m = NULL; |
79573162 | 484 | if (vdev->visorchannel == NULL) |
826b6a0f PB |
485 | return 0; |
486 | m = visor_seq_file_new_buffer(buf, PAGE_SIZE - 1); | |
487 | if (m == NULL) | |
488 | return 0; | |
79573162 | 489 | visorchannel_debug(vdev->visorchannel, 1, m, 0); |
826b6a0f PB |
490 | count = m->count; |
491 | visor_seq_file_done_buffer(m); | |
492 | m = NULL; | |
493 | */ | |
79573162 | 494 | return 0; |
826b6a0f PB |
495 | } |
496 | ||
79573162 DZ |
497 | static DEVICE_ATTR_RO(physaddr); |
498 | static DEVICE_ATTR_RO(nbytes); | |
499 | static DEVICE_ATTR_RO(clientpartition); | |
500 | static DEVICE_ATTR_RO(typeguid); | |
501 | static DEVICE_ATTR_RO(zoneguid); | |
502 | static DEVICE_ATTR_RO(typename); | |
503 | static DEVICE_ATTR_RO(dump); | |
504 | ||
505 | static struct attribute *channel_attrs[] = { | |
506 | &dev_attr_physaddr.attr, | |
507 | &dev_attr_nbytes.attr, | |
508 | &dev_attr_clientpartition.attr, | |
509 | &dev_attr_typeguid.attr, | |
510 | &dev_attr_zoneguid.attr, | |
511 | &dev_attr_typename.attr, | |
512 | &dev_attr_dump.attr, | |
826b6a0f PB |
513 | }; |
514 | ||
79573162 DZ |
515 | static struct attribute_group channel_attr_grp = { |
516 | .name = "channel", | |
517 | .attrs = channel_attrs, | |
826b6a0f PB |
518 | }; |
519 | ||
79573162 DZ |
520 | static const struct attribute_group *visorbus_dev_groups[] = { |
521 | &channel_attr_grp, | |
522 | NULL | |
826b6a0f PB |
523 | }; |
524 | ||
79573162 | 525 | /* end implementation of specific channel attributes */ |
826b6a0f | 526 | |
a9a7c767 | 527 | #define to_visorbus_devdata(obj) \ |
d181dd03 | 528 | container_of(obj, struct visorbus_devdata, dev) |
3703987c | 529 | |
3703987c EA |
530 | /* BUS instance attributes |
531 | * | |
532 | * define & implement display of bus attributes under | |
533 | * /sys/bus/visorbus/busses/visorbus<n>. | |
534 | * | |
535 | * This is a bit hoaky because the kernel does not yet have the infrastructure | |
536 | * to separate bus INSTANCE attributes from bus TYPE attributes... | |
537 | * so we roll our own. See businst.c / businst.h. | |
538 | * | |
539 | */ | |
540 | ||
d181dd03 DZ |
541 | static ssize_t partition_handle_show(struct device *dev, |
542 | struct device_attribute *attr, | |
543 | char *buf) { | |
5ecbd5d4 DZ |
544 | struct visor_device *vdev = to_visor_device(dev); |
545 | u64 handle = visorchannel_get_clientpartition(vdev->visorchannel); | |
3703987c | 546 | |
5ecbd5d4 | 547 | return snprintf(buf, PAGE_SIZE, "0x%Lx\n", handle); |
3703987c EA |
548 | } |
549 | ||
d181dd03 DZ |
550 | static ssize_t partition_guid_show(struct device *dev, |
551 | struct device_attribute *attr, | |
552 | char *buf) { | |
5ecbd5d4 | 553 | struct visor_device *vdev = to_visor_device(dev); |
3703987c | 554 | |
5ecbd5d4 | 555 | return snprintf(buf, PAGE_SIZE, "{%pUb}\n", &vdev->partition_uuid); |
3703987c EA |
556 | } |
557 | ||
d181dd03 DZ |
558 | static ssize_t partition_name_show(struct device *dev, |
559 | struct device_attribute *attr, | |
560 | char *buf) { | |
5ecbd5d4 | 561 | struct visor_device *vdev = to_visor_device(dev); |
3703987c | 562 | |
5ecbd5d4 | 563 | return snprintf(buf, PAGE_SIZE, "%s\n", vdev->name); |
3703987c EA |
564 | } |
565 | ||
d181dd03 DZ |
566 | static ssize_t channel_addr_show(struct device *dev, |
567 | struct device_attribute *attr, | |
568 | char *buf) { | |
5ecbd5d4 DZ |
569 | struct visor_device *vdev = to_visor_device(dev); |
570 | u64 addr = visorchannel_get_physaddr(vdev->visorchannel); | |
3703987c | 571 | |
5ecbd5d4 | 572 | return snprintf(buf, PAGE_SIZE, "0x%Lx\n", addr); |
3703987c EA |
573 | } |
574 | ||
d181dd03 DZ |
575 | static ssize_t channel_bytes_show(struct device *dev, |
576 | struct device_attribute *attr, | |
577 | char *buf) { | |
5ecbd5d4 DZ |
578 | struct visor_device *vdev = to_visor_device(dev); |
579 | u64 nbytes = visorchannel_get_nbytes(vdev->visorchannel); | |
3703987c | 580 | |
5ecbd5d4 | 581 | return snprintf(buf, PAGE_SIZE, "0x%Lx\n", nbytes); |
3703987c EA |
582 | } |
583 | ||
d181dd03 DZ |
584 | static ssize_t channel_id_show(struct device *dev, |
585 | struct device_attribute *attr, | |
586 | char *buf) { | |
5ecbd5d4 | 587 | struct visor_device *vdev = to_visor_device(dev); |
3703987c EA |
588 | int len = 0; |
589 | ||
5ecbd5d4 DZ |
590 | if (vdev->visorchannel) { |
591 | visorchannel_id(vdev->visorchannel, buf); | |
3703987c EA |
592 | len = strlen(buf); |
593 | buf[len++] = '\n'; | |
594 | } | |
595 | return len; | |
596 | } | |
597 | ||
d181dd03 DZ |
598 | static ssize_t client_bus_info_show(struct device *dev, |
599 | struct device_attribute *attr, | |
600 | char *buf) { | |
5ecbd5d4 DZ |
601 | struct visor_device *vdev = to_visor_device(dev); |
602 | struct visorchannel *channel = vdev->visorchannel; | |
603 | ||
3703987c EA |
604 | int i, x, remain = PAGE_SIZE; |
605 | unsigned long off; | |
606 | char *p = buf; | |
607 | u8 *partition_name; | |
608 | struct ultra_vbus_deviceinfo dev_info; | |
609 | ||
610 | partition_name = ""; | |
5ecbd5d4 DZ |
611 | if (channel) { |
612 | if (vdev->name) | |
613 | partition_name = vdev->name; | |
3703987c | 614 | x = snprintf(p, remain, |
5ecbd5d4 DZ |
615 | "Client device / client driver info for %s partition (vbus #%ld):\n", |
616 | partition_name, vdev->chipset_dev_no); | |
3703987c EA |
617 | p += x; |
618 | remain -= x; | |
5ecbd5d4 | 619 | x = visorchannel_read(channel, |
3703987c EA |
620 | offsetof(struct |
621 | spar_vbus_channel_protocol, | |
622 | chp_info), | |
623 | &dev_info, sizeof(dev_info)); | |
624 | if (x >= 0) { | |
625 | x = vbuschannel_devinfo_to_string(&dev_info, p, | |
626 | remain, -1); | |
627 | p += x; | |
628 | remain -= x; | |
629 | } | |
5ecbd5d4 | 630 | x = visorchannel_read(channel, |
3703987c EA |
631 | offsetof(struct |
632 | spar_vbus_channel_protocol, | |
633 | bus_info), | |
634 | &dev_info, sizeof(dev_info)); | |
635 | if (x >= 0) { | |
636 | x = vbuschannel_devinfo_to_string(&dev_info, p, | |
637 | remain, -1); | |
638 | p += x; | |
639 | remain -= x; | |
640 | } | |
641 | off = offsetof(struct spar_vbus_channel_protocol, dev_info); | |
642 | i = 0; | |
643 | while (off + sizeof(dev_info) <= | |
5ecbd5d4 DZ |
644 | visorchannel_get_nbytes(channel)) { |
645 | x = visorchannel_read(channel, | |
3703987c EA |
646 | off, &dev_info, sizeof(dev_info)); |
647 | if (x >= 0) { | |
648 | x = vbuschannel_devinfo_to_string | |
649 | (&dev_info, p, remain, i); | |
650 | p += x; | |
651 | remain -= x; | |
652 | } | |
653 | off += sizeof(dev_info); | |
654 | i++; | |
655 | } | |
656 | } | |
657 | return PAGE_SIZE - remain; | |
658 | } | |
659 | ||
d181dd03 DZ |
660 | static DEVICE_ATTR_RO(partition_handle); |
661 | static DEVICE_ATTR_RO(partition_guid); | |
662 | static DEVICE_ATTR_RO(partition_name); | |
663 | static DEVICE_ATTR_RO(channel_addr); | |
664 | static DEVICE_ATTR_RO(channel_bytes); | |
665 | static DEVICE_ATTR_RO(channel_id); | |
666 | static DEVICE_ATTR_RO(client_bus_info); | |
667 | ||
668 | static struct attribute *dev_attrs[] = { | |
669 | &dev_attr_partition_handle.attr, | |
670 | &dev_attr_partition_guid.attr, | |
671 | &dev_attr_partition_name.attr, | |
672 | &dev_attr_channel_addr.attr, | |
673 | &dev_attr_channel_bytes.attr, | |
674 | &dev_attr_channel_id.attr, | |
675 | &dev_attr_client_bus_info.attr, | |
676 | NULL | |
677 | }; | |
3703987c | 678 | |
d181dd03 DZ |
679 | static struct attribute_group dev_attr_grp = { |
680 | .attrs = dev_attrs, | |
681 | }; | |
3703987c | 682 | |
d181dd03 DZ |
683 | static const struct attribute_group *visorbus_groups[] = { |
684 | &dev_attr_grp, | |
685 | NULL | |
686 | }; | |
3703987c EA |
687 | |
688 | /* DRIVER attributes | |
689 | * | |
690 | * define & implement display of driver attributes under | |
691 | * /sys/bus/visorbus/drivers/<drivername>. | |
692 | * | |
693 | */ | |
694 | ||
695 | static ssize_t | |
696 | DRIVER_ATTR_version(struct device_driver *xdrv, char *buf) | |
697 | { | |
698 | struct visor_driver *drv = to_visor_driver(xdrv); | |
699 | ||
700 | return snprintf(buf, PAGE_SIZE, "%s\n", drv->version); | |
701 | } | |
702 | ||
703 | static int | |
704 | register_driver_attributes(struct visor_driver *drv) | |
705 | { | |
706 | int rc; | |
707 | struct driver_attribute version = | |
708 | __ATTR(version, S_IRUGO, DRIVER_ATTR_version, NULL); | |
709 | drv->version_attr = version; | |
710 | rc = driver_create_file(&drv->driver, &drv->version_attr); | |
711 | return rc; | |
712 | } | |
713 | ||
714 | static void | |
715 | unregister_driver_attributes(struct visor_driver *drv) | |
716 | { | |
717 | driver_remove_file(&drv->driver, &drv->version_attr); | |
718 | } | |
719 | ||
720 | /* DEVICE attributes | |
721 | * | |
722 | * define & implement display of device attributes under | |
723 | * /sys/bus/visorbus/devices/<devicename>. | |
724 | * | |
725 | */ | |
726 | ||
727 | #define DEVATTR(nam, func) { \ | |
728 | .attr = { .name = __stringify(nam), \ | |
729 | .mode = 0444, \ | |
730 | .owner = THIS_MODULE }, \ | |
731 | .show = func, \ | |
732 | } | |
733 | ||
734 | static struct device_attribute visor_device_attrs[] = { | |
735 | /* DEVATTR(channel_nbytes, DEVICE_ATTR_channel_nbytes), */ | |
736 | __ATTR_NULL | |
737 | }; | |
738 | ||
739 | static void | |
740 | dev_periodic_work(void *xdev) | |
741 | { | |
742 | struct visor_device *dev = (struct visor_device *)xdev; | |
743 | struct visor_driver *drv = to_visor_driver(dev->device.driver); | |
744 | ||
745 | down(&dev->visordriver_callback_lock); | |
746 | if (drv->channel_interrupt) | |
747 | drv->channel_interrupt(dev); | |
748 | up(&dev->visordriver_callback_lock); | |
749 | if (!visor_periodic_work_nextperiod(dev->periodic_work)) | |
750 | put_device(&dev->device); | |
751 | } | |
752 | ||
753 | static void | |
754 | dev_start_periodic_work(struct visor_device *dev) | |
755 | { | |
756 | if (dev->being_removed) | |
757 | return; | |
758 | /* now up by at least 2 */ | |
759 | get_device(&dev->device); | |
760 | if (!visor_periodic_work_start(dev->periodic_work)) | |
761 | put_device(&dev->device); | |
762 | } | |
763 | ||
764 | static void | |
765 | dev_stop_periodic_work(struct visor_device *dev) | |
766 | { | |
767 | if (visor_periodic_work_stop(dev->periodic_work)) | |
768 | put_device(&dev->device); | |
769 | } | |
770 | ||
771 | /** This is called automatically upon adding a visor_device (device_add), or | |
772 | * adding a visor_driver (visorbus_register_visor_driver), but only after | |
773 | * visorbus_match has returned 1 to indicate a successful match between | |
774 | * driver and device. | |
775 | */ | |
776 | static int | |
777 | visordriver_probe_device(struct device *xdev) | |
778 | { | |
779 | int rc; | |
780 | struct visor_driver *drv; | |
781 | struct visor_device *dev; | |
782 | ||
783 | drv = to_visor_driver(xdev->driver); | |
784 | dev = to_visor_device(xdev); | |
785 | down(&dev->visordriver_callback_lock); | |
779d0752 | 786 | dev->being_removed = false; |
3703987c EA |
787 | /* |
788 | * ensure that the dev->being_removed flag is cleared before | |
789 | * we start the probe | |
790 | */ | |
791 | wmb(); | |
792 | get_device(&dev->device); | |
793 | if (!drv->probe) { | |
794 | up(&dev->visordriver_callback_lock); | |
795 | rc = -1; | |
796 | goto away; | |
797 | } | |
798 | rc = drv->probe(dev); | |
799 | if (rc < 0) | |
800 | goto away; | |
801 | ||
802 | fix_vbus_dev_info(dev); | |
803 | up(&dev->visordriver_callback_lock); | |
804 | rc = 0; | |
805 | away: | |
806 | if (rc != 0) | |
807 | put_device(&dev->device); | |
808 | /* We could get here more than once if the child driver module is | |
809 | * unloaded and re-loaded while devices are present. That's why we | |
810 | * need a flag to be sure that we only respond to the device_create | |
811 | * once. We cannot respond to the device_create prior to here, | |
812 | * because until we call drv->probe() above, the channel has not been | |
813 | * initialized. | |
814 | */ | |
815 | if (!dev->responded_to_device_create) { | |
b4b598fd DZ |
816 | struct visorchipset_device_info dev_info; |
817 | ||
818 | if (!visorchipset_get_device_info(dev->chipset_bus_no, | |
819 | dev->chipset_dev_no, | |
820 | &dev_info)) | |
821 | /* hmm, what to do here */ | |
822 | return rc; | |
823 | ||
779d0752 | 824 | dev->responded_to_device_create = true; |
3703987c | 825 | if (chipset_responders.device_create) |
b4b598fd | 826 | (*chipset_responders.device_create)(&dev_info, rc); |
3703987c EA |
827 | } |
828 | return rc; | |
829 | } | |
830 | ||
831 | /** This is called when device_unregister() is called for each child device | |
832 | * instance, to notify the appropriate visorbus_driver that the device is | |
833 | * going away, and to decrease the reference count of the device. | |
834 | */ | |
835 | static int | |
836 | visordriver_remove_device(struct device *xdev) | |
837 | { | |
838 | int rc = 0; | |
839 | struct visor_device *dev; | |
840 | struct visor_driver *drv; | |
841 | ||
842 | dev = to_visor_device(xdev); | |
843 | drv = to_visor_driver(xdev->driver); | |
844 | down(&dev->visordriver_callback_lock); | |
779d0752 | 845 | dev->being_removed = true; |
3703987c EA |
846 | /* |
847 | * ensure that the dev->being_removed flag is set before we start the | |
848 | * actual removal | |
849 | */ | |
850 | wmb(); | |
851 | if (drv) { | |
852 | if (drv->remove) | |
853 | drv->remove(dev); | |
854 | } | |
855 | up(&dev->visordriver_callback_lock); | |
856 | dev_stop_periodic_work(dev); | |
857 | devmajorminor_remove_all_files(dev); | |
858 | ||
859 | put_device(&dev->device); | |
860 | ||
861 | return rc; | |
862 | } | |
863 | ||
864 | /** A particular type of visor driver calls this function to register | |
865 | * the driver. The caller MUST fill in the following fields within the | |
866 | * #drv structure: | |
867 | * name, version, owner, channel_types, probe, remove | |
868 | * | |
869 | * Here's how the whole Linux bus / driver / device model works. | |
870 | * | |
871 | * At system start-up, the visorbus kernel module is loaded, which registers | |
872 | * visorbus_type as a bus type, using bus_register(). | |
873 | * | |
874 | * All kernel modules that support particular device types on a | |
875 | * visorbus bus are loaded. Each of these kernel modules calls | |
876 | * visorbus_register_visor_driver() in their init functions, passing a | |
877 | * visor_driver struct. visorbus_register_visor_driver() in turn calls | |
878 | * register_driver(&visor_driver.driver). This .driver member is | |
879 | * initialized with generic methods (like probe), whose sole responsibility | |
880 | * is to act as a broker for the real methods, which are within the | |
881 | * visor_driver struct. (This is the way the subclass behavior is | |
882 | * implemented, since visor_driver is essentially a subclass of the | |
883 | * generic driver.) Whenever a driver_register() happens, core bus code in | |
884 | * the kernel does (see device_attach() in drivers/base/dd.c): | |
885 | * | |
886 | * for each dev associated with the bus (the bus that driver is on) that | |
887 | * does not yet have a driver | |
888 | * if bus.match(dev,newdriver) == yes_matched ** .match specified | |
889 | * ** during bus_register(). | |
890 | * newdriver.probe(dev) ** for visor drivers, this will call | |
891 | * ** the generic driver.probe implemented in visorbus.c, | |
892 | * ** which in turn calls the probe specified within the | |
893 | * ** struct visor_driver (which was specified by the | |
894 | * ** actual device driver as part of | |
895 | * ** visorbus_register_visor_driver()). | |
896 | * | |
897 | * The above dance also happens when a new device appears. | |
898 | * So the question is, how are devices created within the system? | |
899 | * Basically, just call device_add(dev). See pci_bus_add_devices(). | |
900 | * pci_scan_device() shows an example of how to build a device struct. It | |
901 | * returns the newly-created struct to pci_scan_single_device(), who adds it | |
902 | * to the list of devices at PCIBUS.devices. That list of devices is what | |
903 | * is traversed by pci_bus_add_devices(). | |
904 | * | |
905 | */ | |
906 | int visorbus_register_visor_driver(struct visor_driver *drv) | |
907 | { | |
908 | int rc = 0; | |
909 | ||
910 | drv->driver.name = drv->name; | |
911 | drv->driver.bus = &visorbus_type; | |
912 | drv->driver.probe = visordriver_probe_device; | |
913 | drv->driver.remove = visordriver_remove_device; | |
914 | drv->driver.owner = drv->owner; | |
915 | ||
916 | /* driver_register does this: | |
917 | * bus_add_driver(drv) | |
918 | * ->if (drv.bus) ** (bus_type) ** | |
919 | * driver_attach(drv) | |
920 | * for each dev with bus type of drv.bus | |
921 | * if (!dev.drv) ** no driver assigned yet ** | |
922 | * if (bus.match(dev,drv)) [visorbus_match] | |
923 | * dev.drv = drv | |
924 | * if (!drv.probe(dev)) [visordriver_probe_device] | |
925 | * dev.drv = NULL | |
926 | */ | |
927 | ||
928 | rc = driver_register(&drv->driver); | |
929 | if (rc < 0) | |
930 | return rc; | |
931 | rc = register_driver_attributes(drv); | |
932 | return rc; | |
933 | } | |
934 | EXPORT_SYMBOL_GPL(visorbus_register_visor_driver); | |
935 | ||
936 | /** A particular type of visor driver calls this function to unregister | |
937 | * the driver, i.e., within its module_exit function. | |
938 | */ | |
939 | void | |
940 | visorbus_unregister_visor_driver(struct visor_driver *drv) | |
941 | { | |
942 | unregister_driver_attributes(drv); | |
943 | driver_unregister(&drv->driver); | |
944 | } | |
945 | EXPORT_SYMBOL_GPL(visorbus_unregister_visor_driver); | |
946 | ||
947 | int | |
948 | visorbus_read_channel(struct visor_device *dev, unsigned long offset, | |
949 | void *dest, unsigned long nbytes) | |
950 | { | |
951 | return visorchannel_read(dev->visorchannel, offset, dest, nbytes); | |
952 | } | |
953 | EXPORT_SYMBOL_GPL(visorbus_read_channel); | |
954 | ||
955 | int | |
956 | visorbus_write_channel(struct visor_device *dev, unsigned long offset, | |
957 | void *src, unsigned long nbytes) | |
958 | { | |
959 | return visorchannel_write(dev->visorchannel, offset, src, nbytes); | |
960 | } | |
961 | EXPORT_SYMBOL_GPL(visorbus_write_channel); | |
962 | ||
963 | int | |
964 | visorbus_clear_channel(struct visor_device *dev, unsigned long offset, u8 ch, | |
965 | unsigned long nbytes) | |
966 | { | |
967 | return visorchannel_clear(dev->visorchannel, offset, ch, nbytes); | |
968 | } | |
969 | EXPORT_SYMBOL_GPL(visorbus_clear_channel); | |
970 | ||
971 | int | |
972 | visorbus_registerdevnode(struct visor_device *dev, | |
973 | const char *name, int major, int minor) | |
974 | { | |
975 | return devmajorminor_create_file(dev, name, major, minor); | |
976 | } | |
977 | EXPORT_SYMBOL_GPL(visorbus_registerdevnode); | |
978 | ||
979 | /** We don't really have a real interrupt, so for now we just call the | |
980 | * interrupt function periodically... | |
981 | */ | |
982 | void | |
983 | visorbus_enable_channel_interrupts(struct visor_device *dev) | |
984 | { | |
985 | dev_start_periodic_work(dev); | |
986 | } | |
987 | EXPORT_SYMBOL_GPL(visorbus_enable_channel_interrupts); | |
988 | ||
989 | void | |
990 | visorbus_disable_channel_interrupts(struct visor_device *dev) | |
991 | { | |
992 | dev_stop_periodic_work(dev); | |
993 | } | |
994 | EXPORT_SYMBOL_GPL(visorbus_disable_channel_interrupts); | |
995 | ||
996 | /** This is how everything starts from the device end. | |
997 | * This function is called when a channel first appears via a ControlVM | |
998 | * message. In response, this function allocates a visor_device to | |
999 | * correspond to the new channel, and attempts to connect it the appropriate | |
1000 | * driver. If the appropriate driver is found, the visor_driver.probe() | |
1001 | * function for that driver will be called, and will be passed the new | |
1002 | * visor_device that we just created. | |
1003 | * | |
1004 | * It's ok if the appropriate driver is not yet loaded, because in that case | |
1005 | * the new device struct will just stick around in the bus' list of devices. | |
1006 | * When the appropriate driver calls visorbus_register_visor_driver(), the | |
1007 | * visor_driver.probe() for the new driver will be called with the new | |
1008 | * device. | |
1009 | */ | |
1010 | static int | |
1011 | create_visor_device(struct visorbus_devdata *devdata, | |
b4b598fd | 1012 | struct visorchipset_device_info *dev_info, |
3703987c EA |
1013 | struct visorchipset_channel_info chan_info, |
1014 | u64 partition_handle) | |
1015 | { | |
1016 | int rc = -1; | |
1017 | struct visorchannel *visorchannel = NULL; | |
1018 | struct visor_device *dev = NULL; | |
779d0752 | 1019 | bool gotten = false, registered1 = false, registered2 = false; |
b4b598fd DZ |
1020 | u32 chipset_bus_no = dev_info->bus_no; |
1021 | u32 chipset_dev_no = dev_info->dev_no; | |
3703987c EA |
1022 | |
1023 | POSTCODE_LINUX_4(DEVICE_CREATE_ENTRY_PC, chipset_dev_no, chipset_bus_no, | |
1024 | POSTCODE_SEVERITY_INFO); | |
1025 | /* prepare chan_hdr (abstraction to read/write channel memory) */ | |
1026 | visorchannel = visorchannel_create(chan_info.channel_addr, | |
3703987c | 1027 | chan_info.n_channel_bytes, |
df94247a | 1028 | GFP_KERNEL, |
3703987c EA |
1029 | chan_info.channel_type_uuid); |
1030 | if (!visorchannel) { | |
1031 | POSTCODE_LINUX_3(DEVICE_CREATE_FAILURE_PC, chipset_dev_no, | |
1032 | DIAG_SEVERITY_ERR); | |
1033 | goto away; | |
1034 | } | |
1035 | dev = kmalloc(sizeof(*dev), GFP_KERNEL); | |
1036 | if (!dev) { | |
1037 | POSTCODE_LINUX_3(DEVICE_CREATE_FAILURE_PC, chipset_dev_no, | |
1038 | DIAG_SEVERITY_ERR); | |
1039 | goto away; | |
1040 | } | |
1041 | ||
1042 | memset(dev, 0, sizeof(struct visor_device)); | |
1043 | dev->visorchannel = visorchannel; | |
1044 | dev->channel_type_guid = chan_info.channel_type_uuid; | |
1045 | dev->channel_bytes = chan_info.n_channel_bytes; | |
1046 | dev->chipset_bus_no = chipset_bus_no; | |
1047 | dev->chipset_dev_no = chipset_dev_no; | |
03274d38 | 1048 | dev->device.parent = &devdata->dev; |
3703987c EA |
1049 | sema_init(&dev->visordriver_callback_lock, 1); /* unlocked */ |
1050 | dev->device.bus = &visorbus_type; | |
79573162 | 1051 | dev->device.groups = visorbus_dev_groups; |
3703987c EA |
1052 | device_initialize(&dev->device); |
1053 | dev->device.release = visorbus_release_device; | |
1054 | /* keep a reference just for us (now 2) */ | |
1055 | get_device(&dev->device); | |
779d0752 | 1056 | gotten = true; |
3703987c EA |
1057 | dev->periodic_work = |
1058 | visor_periodic_work_create(POLLJIFFIES_NORMALCHANNEL, | |
1059 | periodic_dev_workqueue, | |
1060 | dev_periodic_work, | |
1061 | dev, dev_name(&dev->device)); | |
1062 | if (!dev->periodic_work) { | |
1063 | POSTCODE_LINUX_3(DEVICE_CREATE_FAILURE_PC, chipset_dev_no, | |
1064 | DIAG_SEVERITY_ERR); | |
1065 | goto away; | |
1066 | } | |
1067 | ||
1068 | /* bus_id must be a unique name with respect to this bus TYPE | |
1069 | * (NOT bus instance). That's why we need to include the bus | |
1070 | * number within the name. | |
1071 | */ | |
b4b598fd | 1072 | dev_set_name(&dev->device, "vbus%u:dev%u", |
3703987c EA |
1073 | chipset_bus_no, chipset_dev_no); |
1074 | ||
1075 | /* device_add does this: | |
1076 | * bus_add_device(dev) | |
1077 | * ->device_attach(dev) | |
1078 | * ->for each driver drv registered on the bus that dev is on | |
1079 | * if (dev.drv) ** device already has a driver ** | |
1080 | * ** not sure we could ever get here... ** | |
1081 | * else | |
1082 | * if (bus.match(dev,drv)) [visorbus_match] | |
1083 | * dev.drv = drv | |
1084 | * if (!drv.probe(dev)) [visordriver_probe_device] | |
1085 | * dev.drv = NULL | |
1086 | * | |
1087 | * Note that device_add does NOT fail if no driver failed to | |
1088 | * claim the device. The device will be linked onto | |
1089 | * bus_type.klist_devices regardless (use bus_for_each_dev). | |
1090 | */ | |
1091 | rc = device_add(&dev->device); | |
1092 | if (rc < 0) { | |
1093 | POSTCODE_LINUX_3(DEVICE_ADD_PC, chipset_bus_no, | |
1094 | DIAG_SEVERITY_ERR); | |
1095 | goto away; | |
1096 | } | |
1097 | ||
1098 | /* note: device_register is simply device_initialize + device_add */ | |
779d0752 | 1099 | registered1 = true; |
3703987c EA |
1100 | |
1101 | rc = register_devmajorminor_attributes(dev); | |
1102 | if (rc < 0) { | |
1103 | POSTCODE_LINUX_3(DEVICE_REGISTER_FAILURE_PC, chipset_dev_no, | |
1104 | DIAG_SEVERITY_ERR); | |
1105 | goto away; | |
1106 | } | |
1107 | ||
779d0752 | 1108 | registered2 = true; |
3703987c EA |
1109 | rc = 0; |
1110 | ||
1111 | away: | |
1112 | if (rc < 0) { | |
1113 | if (registered2) | |
1114 | unregister_devmajorminor_attributes(dev); | |
3703987c EA |
1115 | if (gotten) |
1116 | put_device(&dev->device); | |
1117 | if (visorchannel) | |
1118 | visorchannel_destroy(visorchannel); | |
1119 | kfree(dev); | |
1120 | } else { | |
1121 | total_devices_created++; | |
1122 | list_add_tail(&dev->list_all, &list_all_device_instances); | |
1123 | } | |
1124 | return rc; | |
1125 | } | |
1126 | ||
1127 | static void | |
1128 | remove_visor_device(struct visor_device *dev) | |
1129 | { | |
1130 | list_del(&dev->list_all); | |
1131 | unregister_devmajorminor_attributes(dev); | |
3703987c EA |
1132 | put_device(&dev->device); |
1133 | device_unregister(&dev->device); | |
1134 | } | |
1135 | ||
1136 | static struct visor_device * | |
d5b3f1dc | 1137 | find_visor_device_by_channel(u64 channel_physaddr) |
3703987c EA |
1138 | { |
1139 | struct list_head *listentry, *listtmp; | |
1140 | ||
1141 | list_for_each_safe(listentry, listtmp, &list_all_device_instances) { | |
1142 | struct visor_device *dev = list_entry(listentry, | |
1143 | struct visor_device, | |
1144 | list_all); | |
1145 | if (visorchannel_get_physaddr(dev->visorchannel) == | |
1146 | channel_physaddr) | |
1147 | return dev; | |
1148 | } | |
1149 | return NULL; | |
1150 | } | |
1151 | ||
1152 | static int | |
1153 | init_vbus_channel(struct visorchannel *chan) | |
1154 | { | |
1155 | int rc = -1; | |
1156 | unsigned long allocated_bytes = visorchannel_get_nbytes(chan); | |
1157 | struct spar_vbus_channel_protocol *x = | |
1158 | kmalloc(sizeof(struct spar_vbus_channel_protocol), | |
1159 | GFP_KERNEL); | |
1160 | ||
1161 | POSTCODE_LINUX_3(VBUS_CHANNEL_ENTRY_PC, rc, POSTCODE_SEVERITY_INFO); | |
1162 | ||
1163 | if (x) { | |
1164 | POSTCODE_LINUX_2(MALLOC_FAILURE_PC, POSTCODE_SEVERITY_ERR); | |
1165 | goto away; | |
1166 | } | |
1167 | if (visorchannel_clear(chan, 0, 0, allocated_bytes) < 0) { | |
1168 | POSTCODE_LINUX_2(VBUS_CHANNEL_FAILURE_PC, | |
1169 | POSTCODE_SEVERITY_ERR); | |
1170 | goto away; | |
1171 | } | |
1172 | if (visorchannel_read | |
1173 | (chan, 0, x, sizeof(struct spar_vbus_channel_protocol)) < 0) { | |
1174 | POSTCODE_LINUX_2(VBUS_CHANNEL_FAILURE_PC, | |
1175 | POSTCODE_SEVERITY_ERR); | |
1176 | goto away; | |
1177 | } | |
1178 | if (!SPAR_VBUS_CHANNEL_OK_SERVER(allocated_bytes)) { | |
1179 | POSTCODE_LINUX_2(VBUS_CHANNEL_FAILURE_PC, | |
1180 | POSTCODE_SEVERITY_ERR); | |
1181 | goto away; | |
1182 | } | |
1183 | ||
1184 | if (visorchannel_write | |
1185 | (chan, 0, x, sizeof(struct spar_vbus_channel_protocol)) < 0) { | |
1186 | POSTCODE_LINUX_3(VBUS_CHANNEL_FAILURE_PC, chan, | |
1187 | POSTCODE_SEVERITY_ERR); | |
1188 | goto away; | |
1189 | } | |
1190 | ||
1191 | POSTCODE_LINUX_3(VBUS_CHANNEL_EXIT_PC, chan, POSTCODE_SEVERITY_INFO); | |
1192 | rc = 0; | |
1193 | ||
1194 | away: | |
1195 | kfree(x); | |
1196 | x = NULL; | |
1197 | return rc; | |
1198 | } | |
1199 | ||
1200 | static int | |
1201 | get_vbus_header_info(struct visorchannel *chan, | |
1202 | struct spar_vbus_headerinfo *hdr_info) | |
1203 | { | |
1204 | int rc = -1; | |
1205 | ||
1206 | if (!SPAR_VBUS_CHANNEL_OK_CLIENT(visorchannel_get_header(chan))) | |
1207 | goto away; | |
1208 | if (visorchannel_read(chan, sizeof(struct channel_header), hdr_info, | |
1209 | sizeof(*hdr_info)) < 0) { | |
1210 | goto away; | |
1211 | } | |
1212 | if (hdr_info->struct_bytes < sizeof(struct spar_vbus_headerinfo)) | |
1213 | goto away; | |
1214 | if (hdr_info->device_info_struct_bytes < | |
1215 | sizeof(struct ultra_vbus_deviceinfo)) { | |
1216 | goto away; | |
1217 | } | |
1218 | rc = 0; | |
1219 | away: | |
1220 | return rc; | |
1221 | } | |
1222 | ||
1223 | /* Write the contents of <info> to the struct | |
1224 | * spar_vbus_channel_protocol.chp_info. */ | |
1225 | ||
1226 | static int | |
1227 | write_vbus_chp_info(struct visorchannel *chan, | |
1228 | struct spar_vbus_headerinfo *hdr_info, | |
1229 | struct ultra_vbus_deviceinfo *info) | |
1230 | { | |
1231 | int off = sizeof(struct channel_header) + hdr_info->chp_info_offset; | |
1232 | ||
1233 | if (hdr_info->chp_info_offset == 0) | |
1234 | return -1; | |
1235 | ||
1236 | if (visorchannel_write(chan, off, info, sizeof(*info)) < 0) | |
1237 | return -1; | |
1238 | return 0; | |
1239 | } | |
1240 | ||
1241 | /* Write the contents of <info> to the struct | |
1242 | * spar_vbus_channel_protocol.bus_info. */ | |
1243 | ||
1244 | static int | |
1245 | write_vbus_bus_info(struct visorchannel *chan, | |
1246 | struct spar_vbus_headerinfo *hdr_info, | |
1247 | struct ultra_vbus_deviceinfo *info) | |
1248 | { | |
1249 | int off = sizeof(struct channel_header) + hdr_info->bus_info_offset; | |
1250 | ||
1251 | if (hdr_info->bus_info_offset == 0) | |
1252 | return -1; | |
1253 | ||
1254 | if (visorchannel_write(chan, off, info, sizeof(*info)) < 0) | |
1255 | return -1; | |
1256 | return 0; | |
1257 | } | |
1258 | ||
1259 | /* Write the contents of <info> to the | |
1260 | * struct spar_vbus_channel_protocol.dev_info[<devix>]. | |
1261 | */ | |
1262 | static int | |
1263 | write_vbus_dev_info(struct visorchannel *chan, | |
1264 | struct spar_vbus_headerinfo *hdr_info, | |
1265 | struct ultra_vbus_deviceinfo *info, int devix) | |
1266 | { | |
1267 | int off = | |
1268 | (sizeof(struct channel_header) + hdr_info->dev_info_offset) + | |
1269 | (hdr_info->device_info_struct_bytes * devix); | |
1270 | ||
1271 | if (hdr_info->dev_info_offset == 0) | |
1272 | return -1; | |
1273 | ||
1274 | if (visorchannel_write(chan, off, info, sizeof(*info)) < 0) | |
1275 | return -1; | |
1276 | return 0; | |
1277 | } | |
1278 | ||
1279 | /* For a child device just created on a client bus, fill in | |
1280 | * information about the driver that is controlling this device into | |
1281 | * the the appropriate slot within the vbus channel of the bus | |
1282 | * instance. | |
1283 | */ | |
1284 | static void | |
1285 | fix_vbus_dev_info(struct visor_device *visordev) | |
1286 | { | |
1287 | int i; | |
1288 | struct visorchipset_bus_info bus_info; | |
1289 | struct visorbus_devdata *devdata = NULL; | |
1290 | struct visor_driver *visordrv; | |
1291 | int bus_no = visordev->chipset_bus_no; | |
1292 | int dev_no = visordev->chipset_dev_no; | |
1293 | struct ultra_vbus_deviceinfo dev_info; | |
1294 | const char *chan_type_name = NULL; | |
1295 | ||
1296 | if (!visordev->device.driver) | |
1297 | return; | |
1298 | ||
1299 | visordrv = to_visor_driver(visordev->device.driver); | |
1300 | if (!visorchipset_get_bus_info(bus_no, &bus_info)) | |
1301 | return; | |
1302 | ||
1303 | devdata = (struct visorbus_devdata *)(bus_info.bus_driver_context); | |
1304 | if (!devdata) | |
1305 | return; | |
1306 | ||
1307 | if (!devdata->vbus_valid) | |
1308 | return; | |
1309 | ||
1310 | /* Within the list of device types (by GUID) that the driver | |
1311 | * says it supports, find out which one of those types matches | |
1312 | * the type of this device, so that we can include the device | |
1313 | * type name | |
1314 | */ | |
1315 | for (i = 0; visordrv->channel_types[i].name; i++) { | |
d5b3f1dc EA |
1316 | if (memcmp(&visordrv->channel_types[i].guid, |
1317 | &visordev->channel_type_guid, | |
1318 | sizeof(visordrv->channel_types[i].guid)) == 0) { | |
3703987c EA |
1319 | chan_type_name = visordrv->channel_types[i].name; |
1320 | break; | |
1321 | } | |
1322 | } | |
1323 | ||
1324 | bus_device_info_init(&dev_info, chan_type_name, | |
1325 | visordrv->name, visordrv->version, | |
1326 | visordrv->vertag); | |
1327 | write_vbus_dev_info(devdata->chan, | |
1328 | &devdata->vbus_hdr_info, &dev_info, dev_no); | |
1329 | ||
1330 | /* Re-write bus+chipset info, because it is possible that this | |
1331 | * was previously written by our evil counterpart, virtpci. | |
1332 | */ | |
1333 | write_vbus_chp_info(devdata->chan, &devdata->vbus_hdr_info, | |
1334 | &chipset_driverinfo); | |
1335 | write_vbus_bus_info(devdata->chan, &devdata->vbus_hdr_info, | |
1336 | &clientbus_driverinfo); | |
1337 | } | |
1338 | ||
1339 | /** Create a device instance for the visor bus itself. | |
1340 | */ | |
1341 | static struct visorbus_devdata * | |
3032aedd | 1342 | create_bus_instance(struct visorchipset_bus_info *bus_info) |
3703987c EA |
1343 | { |
1344 | struct visorbus_devdata *rc = NULL; | |
1345 | struct visorbus_devdata *devdata = NULL; | |
3032aedd | 1346 | int id = bus_info->bus_no; |
3703987c EA |
1347 | |
1348 | POSTCODE_LINUX_2(BUS_CREATE_ENTRY_PC, POSTCODE_SEVERITY_INFO); | |
03274d38 DZ |
1349 | devdata = kzalloc(sizeof(*devdata), GFP_KERNEL); |
1350 | if (!devdata) { | |
3703987c EA |
1351 | POSTCODE_LINUX_2(MALLOC_FAILURE_PC, POSTCODE_SEVERITY_ERR); |
1352 | rc = NULL; | |
1353 | goto away; | |
1354 | } | |
03274d38 | 1355 | dev_set_name(&devdata->dev, "visorbus%d", id); |
f3aa5fe8 | 1356 | devdata->dev.bus = &visorbus_type; |
d181dd03 | 1357 | devdata->dev.groups = visorbus_groups; |
03274d38 DZ |
1358 | devdata->dev.release = visorbus_release_busdevice; |
1359 | if (device_register(&devdata->dev) < 0) { | |
3703987c EA |
1360 | POSTCODE_LINUX_3(DEVICE_CREATE_FAILURE_PC, id, |
1361 | POSTCODE_SEVERITY_ERR); | |
1362 | rc = NULL; | |
1363 | goto away; | |
1364 | } | |
3703987c | 1365 | devdata->devno = id; |
3032aedd DZ |
1366 | if ((bus_info->chan_info.channel_addr > 0) && |
1367 | (bus_info->chan_info.n_channel_bytes > 0)) { | |
1368 | u64 channel_addr = bus_info->chan_info.channel_addr; | |
3703987c EA |
1369 | unsigned long n_channel_bytes = |
1370 | (unsigned long) | |
3032aedd | 1371 | bus_info->chan_info.n_channel_bytes; |
3703987c | 1372 | uuid_le channel_type_guid = |
3032aedd | 1373 | bus_info->chan_info.channel_type_uuid; |
3703987c EA |
1374 | |
1375 | devdata->chan = visorchannel_create(channel_addr, | |
1376 | n_channel_bytes, | |
df94247a | 1377 | GFP_KERNEL, |
3703987c EA |
1378 | channel_type_guid); |
1379 | if (!devdata->chan) { | |
1380 | POSTCODE_LINUX_3(DEVICE_CREATE_FAILURE_PC, channel_addr, | |
1381 | POSTCODE_SEVERITY_ERR); | |
1382 | } else { | |
3032aedd | 1383 | if (bus_info->flags.server) { |
3703987c EA |
1384 | init_vbus_channel(devdata->chan); |
1385 | } else { | |
1386 | if (get_vbus_header_info(devdata->chan, | |
1387 | &devdata-> | |
1388 | vbus_hdr_info) >= 0) { | |
779d0752 | 1389 | devdata->vbus_valid = true; |
3703987c EA |
1390 | write_vbus_chp_info(devdata->chan, |
1391 | &devdata-> | |
1392 | vbus_hdr_info, | |
1393 | &chipset_driverinfo | |
1394 | ); | |
1395 | write_vbus_bus_info(devdata->chan, | |
1396 | &devdata-> | |
1397 | vbus_hdr_info, | |
1398 | &clientbus_driverinfo); | |
1399 | } | |
1400 | } | |
1401 | } | |
1402 | } | |
3703987c EA |
1403 | bus_count++; |
1404 | list_add_tail(&devdata->list_all, &list_all_bus_instances); | |
1405 | if (id == 0) | |
1406 | devdata = devdata; /* for testing ONLY */ | |
03274d38 | 1407 | dev_set_drvdata(&devdata->dev, devdata); |
3703987c EA |
1408 | rc = devdata; |
1409 | away: | |
1410 | return rc; | |
1411 | } | |
1412 | ||
1413 | /** Remove a device instance for the visor bus itself. | |
1414 | */ | |
1415 | static void | |
1416 | remove_bus_instance(struct visorbus_devdata *devdata) | |
1417 | { | |
1418 | /* Note that this will result in the release method for | |
1419 | * devdata->dev being called, which will call | |
1420 | * visorbus_release_busdevice(). This has something to do with | |
1421 | * the put_device() done in device_unregister(), but I have never | |
1422 | * successfully been able to trace thru the code to see where/how | |
1423 | * release() gets called. But I know it does. | |
1424 | */ | |
3703987c EA |
1425 | bus_count--; |
1426 | if (devdata->chan) { | |
1427 | visorchannel_destroy(devdata->chan); | |
1428 | devdata->chan = NULL; | |
1429 | } | |
1430 | list_del(&devdata->list_all); | |
03274d38 | 1431 | device_unregister(&devdata->dev); |
3703987c EA |
1432 | } |
1433 | ||
1434 | /** Create and register the one-and-only one instance of | |
1435 | * the visor bus type (visorbus_type). | |
1436 | */ | |
1437 | static int | |
1438 | create_bus_type(void) | |
1439 | { | |
1440 | int rc = 0; | |
1441 | ||
1442 | visorbus_type.dev_attrs = visor_device_attrs; | |
1443 | rc = bus_register(&visorbus_type); | |
3703987c EA |
1444 | return rc; |
1445 | } | |
1446 | ||
1447 | /** Remove the one-and-only one instance of the visor bus type (visorbus_type). | |
1448 | */ | |
1449 | static void | |
1450 | remove_bus_type(void) | |
1451 | { | |
3703987c EA |
1452 | bus_unregister(&visorbus_type); |
1453 | } | |
1454 | ||
1455 | /** Remove all child visor bus device instances. | |
1456 | */ | |
1457 | static void | |
1458 | remove_all_visor_devices(void) | |
1459 | { | |
1460 | struct list_head *listentry, *listtmp; | |
1461 | ||
1462 | list_for_each_safe(listentry, listtmp, &list_all_device_instances) { | |
1463 | struct visor_device *dev = list_entry(listentry, | |
1464 | struct visor_device, | |
1465 | list_all); | |
1466 | remove_visor_device(dev); | |
1467 | } | |
1468 | } | |
1469 | ||
779d0752 | 1470 | static bool entered_testing_mode; |
3703987c EA |
1471 | static struct visorchipset_channel_info test_channel_infos[MAXDEVICETEST]; |
1472 | static unsigned long test_bus_nos[MAXDEVICETEST]; | |
1473 | static unsigned long test_dev_nos[MAXDEVICETEST]; | |
1474 | ||
1475 | static void | |
3032aedd | 1476 | chipset_bus_create(struct visorchipset_bus_info *bus_info) |
3703987c | 1477 | { |
3703987c EA |
1478 | struct visorbus_devdata *devdata; |
1479 | int rc = -1; | |
3032aedd | 1480 | u32 bus_no = bus_info->bus_no; |
3703987c EA |
1481 | |
1482 | POSTCODE_LINUX_3(BUS_CREATE_ENTRY_PC, bus_no, POSTCODE_SEVERITY_INFO); | |
3032aedd | 1483 | devdata = create_bus_instance(bus_info); |
3703987c EA |
1484 | if (!devdata) |
1485 | goto away; | |
3032aedd | 1486 | if (!visorchipset_set_bus_context(bus_info, devdata)) |
3703987c EA |
1487 | goto away; |
1488 | POSTCODE_LINUX_3(BUS_CREATE_EXIT_PC, bus_no, POSTCODE_SEVERITY_INFO); | |
1489 | rc = 0; | |
1490 | away: | |
1491 | if (rc < 0) { | |
1492 | POSTCODE_LINUX_3(BUS_CREATE_FAILURE_PC, bus_no, | |
1493 | POSTCODE_SEVERITY_ERR); | |
1494 | return; | |
1495 | } | |
1496 | POSTCODE_LINUX_3(CHIPSET_INIT_SUCCESS_PC, bus_no, | |
1497 | POSTCODE_SEVERITY_INFO); | |
1498 | if (chipset_responders.bus_create) | |
3032aedd | 1499 | (*chipset_responders.bus_create) (bus_info, rc); |
3703987c EA |
1500 | } |
1501 | ||
1502 | static void | |
3032aedd | 1503 | chipset_bus_destroy(struct visorchipset_bus_info *bus_info) |
3703987c | 1504 | { |
3703987c EA |
1505 | struct visorbus_devdata *devdata; |
1506 | int rc = -1; | |
1507 | ||
3032aedd | 1508 | devdata = (struct visorbus_devdata *)(bus_info->bus_driver_context); |
3703987c EA |
1509 | if (!devdata) |
1510 | goto away; | |
1511 | remove_bus_instance(devdata); | |
3032aedd | 1512 | if (!visorchipset_set_bus_context(bus_info, NULL)) |
3703987c EA |
1513 | goto away; |
1514 | rc = 0; | |
1515 | away: | |
1516 | if (rc < 0) | |
1517 | return; | |
1518 | if (chipset_responders.bus_destroy) | |
3032aedd | 1519 | (*chipset_responders.bus_destroy)(bus_info, rc); |
3703987c EA |
1520 | } |
1521 | ||
1522 | static void | |
b4b598fd | 1523 | chipset_device_create(struct visorchipset_device_info *dev_info) |
3703987c | 1524 | { |
3703987c EA |
1525 | struct visorchipset_bus_info bus_info; |
1526 | struct visorbus_devdata *devdata = NULL; | |
1527 | int rc = -1; | |
b4b598fd DZ |
1528 | u32 bus_no = dev_info->bus_no; |
1529 | u32 dev_no = dev_info->dev_no; | |
3703987c EA |
1530 | |
1531 | POSTCODE_LINUX_4(DEVICE_CREATE_ENTRY_PC, dev_no, bus_no, | |
1532 | POSTCODE_SEVERITY_INFO); | |
1533 | ||
1534 | if (entered_testing_mode) | |
1535 | return; | |
3703987c EA |
1536 | if (!visorchipset_get_bus_info(bus_no, &bus_info)) |
1537 | goto away; | |
1538 | if (visorbus_devicetest) | |
1539 | if (total_devices_created < MAXDEVICETEST) { | |
1540 | test_channel_infos[total_devices_created] = | |
b4b598fd | 1541 | dev_info->chan_info; |
3703987c EA |
1542 | test_bus_nos[total_devices_created] = bus_no; |
1543 | test_dev_nos[total_devices_created] = dev_no; | |
1544 | } | |
1545 | POSTCODE_LINUX_4(DEVICE_CREATE_EXIT_PC, dev_no, bus_no, | |
1546 | POSTCODE_SEVERITY_INFO); | |
1547 | rc = 0; | |
1548 | away: | |
1549 | if (rc < 0) { | |
1550 | POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, dev_no, bus_no, | |
1551 | POSTCODE_SEVERITY_ERR); | |
1552 | return; | |
1553 | } | |
1554 | devdata = (struct visorbus_devdata *)(bus_info.bus_driver_context); | |
b4b598fd DZ |
1555 | rc = create_visor_device(devdata, dev_info, |
1556 | dev_info->chan_info, | |
1557 | bus_info.partition_handle); | |
3703987c EA |
1558 | POSTCODE_LINUX_4(DEVICE_CREATE_SUCCESS_PC, dev_no, bus_no, |
1559 | POSTCODE_SEVERITY_INFO); | |
1560 | if (rc < 0) | |
1561 | if (chipset_responders.device_create) | |
b4b598fd | 1562 | (*chipset_responders.device_create)(dev_info, rc); |
3703987c EA |
1563 | } |
1564 | ||
1565 | static void | |
b4b598fd | 1566 | chipset_device_destroy(struct visorchipset_device_info *dev_info) |
3703987c | 1567 | { |
3703987c EA |
1568 | struct visor_device *dev; |
1569 | int rc = -1; | |
1570 | ||
1571 | if (entered_testing_mode) | |
1572 | return; | |
b4b598fd | 1573 | dev = find_visor_device_by_channel(dev_info->chan_info.channel_addr); |
3703987c EA |
1574 | if (!dev) |
1575 | goto away; | |
1576 | rc = 0; | |
1577 | away: | |
1578 | if (rc < 0) | |
1579 | return; | |
1580 | ||
1581 | if (chipset_responders.device_destroy) | |
b4b598fd | 1582 | (*chipset_responders.device_destroy) (dev_info, rc); |
3703987c EA |
1583 | remove_visor_device(dev); |
1584 | } | |
1585 | ||
1586 | /* This is the callback function specified for a function driver, to | |
1587 | * be called when a pending "pause device" operation has been | |
1588 | * completed. | |
1589 | */ | |
1590 | static void | |
b4b598fd DZ |
1591 | pause_state_change_complete(struct visor_device *dev, int status, |
1592 | void *info) | |
3703987c | 1593 | { |
b4b598fd DZ |
1594 | struct visorchipset_device_info *dev_info = info; |
1595 | ||
3703987c EA |
1596 | if (!dev->pausing) |
1597 | return; | |
1598 | ||
779d0752 | 1599 | dev->pausing = false; |
3703987c EA |
1600 | if (!chipset_responders.device_pause) /* this can never happen! */ |
1601 | return; | |
1602 | ||
1603 | /* Notify the chipset driver that the pause is complete, which | |
1604 | * will presumably want to send some sort of response to the | |
1605 | * initiator. */ | |
b4b598fd | 1606 | (*chipset_responders.device_pause) (dev_info, status); |
3703987c EA |
1607 | } |
1608 | ||
1609 | /* This is the callback function specified for a function driver, to | |
1610 | * be called when a pending "resume device" operation has been | |
1611 | * completed. | |
1612 | */ | |
1613 | static void | |
b4b598fd DZ |
1614 | resume_state_change_complete(struct visor_device *dev, int status, |
1615 | void *info) | |
3703987c | 1616 | { |
b4b598fd DZ |
1617 | struct visorchipset_device_info *dev_info = info; |
1618 | ||
3703987c EA |
1619 | if (!dev->resuming) |
1620 | return; | |
1621 | ||
779d0752 | 1622 | dev->resuming = false; |
3703987c EA |
1623 | if (!chipset_responders.device_resume) /* this can never happen! */ |
1624 | return; | |
1625 | ||
1626 | /* Notify the chipset driver that the resume is complete, | |
1627 | * which will presumably want to send some sort of response to | |
1628 | * the initiator. */ | |
b4b598fd | 1629 | (*chipset_responders.device_resume) (dev_info, status); |
3703987c EA |
1630 | } |
1631 | ||
1632 | /* Tell the subordinate function driver for a specific device to pause | |
1633 | * or resume that device. Result is returned asynchronously via a | |
1634 | * callback function. | |
1635 | */ | |
1636 | static void | |
b4b598fd DZ |
1637 | initiate_chipset_device_pause_resume(struct visorchipset_device_info *dev_info, |
1638 | bool is_pause) | |
3703987c | 1639 | { |
3703987c EA |
1640 | struct visor_device *dev = NULL; |
1641 | int rc = -1, x; | |
1642 | struct visor_driver *drv = NULL; | |
b4b598fd DZ |
1643 | void (*notify_func)(struct visorchipset_device_info *dev_info, |
1644 | int response) = NULL; | |
3703987c EA |
1645 | |
1646 | if (is_pause) | |
1647 | notify_func = chipset_responders.device_pause; | |
1648 | else | |
1649 | notify_func = chipset_responders.device_resume; | |
1650 | if (!notify_func) | |
1651 | goto away; | |
1652 | ||
b4b598fd | 1653 | dev = find_visor_device_by_channel(dev_info->chan_info.channel_addr); |
3703987c EA |
1654 | if (!dev) |
1655 | goto away; | |
1656 | ||
1657 | drv = to_visor_driver(dev->device.driver); | |
1658 | if (!drv) | |
1659 | goto away; | |
1660 | ||
1661 | if (dev->pausing || dev->resuming) | |
1662 | goto away; | |
1663 | ||
1664 | /* Note that even though both drv->pause() and drv->resume | |
1665 | * specify a callback function, it is NOT necessary for us to | |
1666 | * increment our local module usage count. Reason is, there | |
1667 | * is already a linkage dependency between child function | |
1668 | * drivers and visorbus, so it is already IMPOSSIBLE to unload | |
1669 | * visorbus while child function drivers are still running. | |
1670 | */ | |
1671 | if (is_pause) { | |
1672 | if (!drv->pause) | |
1673 | goto away; | |
1674 | ||
779d0752 | 1675 | dev->pausing = true; |
b4b598fd DZ |
1676 | x = drv->pause(dev, pause_state_change_complete, |
1677 | (void *)dev_info); | |
3703987c EA |
1678 | } else { |
1679 | /* This should be done at BUS resume time, but an | |
1680 | * existing problem prevents us from ever getting a bus | |
1681 | * resume... This hack would fail to work should we | |
1682 | * ever have a bus that contains NO devices, since we | |
1683 | * would never even get here in that case. */ | |
1684 | fix_vbus_dev_info(dev); | |
1685 | if (!drv->resume) | |
1686 | goto away; | |
1687 | ||
779d0752 | 1688 | dev->resuming = true; |
b4b598fd DZ |
1689 | x = drv->resume(dev, resume_state_change_complete, |
1690 | (void *)dev_info); | |
3703987c EA |
1691 | } |
1692 | if (x < 0) { | |
1693 | if (is_pause) | |
779d0752 | 1694 | dev->pausing = false; |
3703987c | 1695 | else |
779d0752 | 1696 | dev->resuming = false; |
3703987c EA |
1697 | goto away; |
1698 | } | |
1699 | rc = 0; | |
1700 | away: | |
1701 | if (rc < 0) { | |
1702 | if (notify_func) | |
b4b598fd | 1703 | (*notify_func)(dev_info, rc); |
3703987c EA |
1704 | } |
1705 | } | |
1706 | ||
1707 | static void | |
b4b598fd | 1708 | chipset_device_pause(struct visorchipset_device_info *dev_info) |
3703987c | 1709 | { |
b4b598fd | 1710 | initiate_chipset_device_pause_resume(dev_info, true); |
3703987c EA |
1711 | } |
1712 | ||
1713 | static void | |
b4b598fd | 1714 | chipset_device_resume(struct visorchipset_device_info *dev_info) |
3703987c | 1715 | { |
b4b598fd | 1716 | initiate_chipset_device_pause_resume(dev_info, false); |
3703987c EA |
1717 | } |
1718 | ||
1719 | struct channel_size_info { | |
1720 | uuid_le guid; | |
1721 | unsigned long min_size; | |
1722 | unsigned long max_size; | |
1723 | }; | |
1724 | ||
55c67dca | 1725 | int |
3703987c EA |
1726 | visorbus_init(void) |
1727 | { | |
1728 | int rc = 0; | |
1729 | ||
1730 | POSTCODE_LINUX_3(DRIVER_ENTRY_PC, rc, POSTCODE_SEVERITY_INFO); | |
1731 | bus_device_info_init(&clientbus_driverinfo, | |
46168810 | 1732 | "clientbus", "visorbus", |
3703987c EA |
1733 | VERSION, NULL); |
1734 | ||
1735 | /* process module options */ | |
1736 | ||
1737 | if (visorbus_devicetest > MAXDEVICETEST) | |
1738 | visorbus_devicetest = MAXDEVICETEST; | |
1739 | ||
1740 | rc = create_bus_type(); | |
1741 | if (rc < 0) { | |
1742 | POSTCODE_LINUX_2(BUS_CREATE_ENTRY_PC, DIAG_SEVERITY_ERR); | |
1743 | goto away; | |
1744 | } | |
1745 | ||
1746 | periodic_dev_workqueue = create_singlethread_workqueue("visorbus_dev"); | |
1747 | if (!periodic_dev_workqueue) { | |
1748 | POSTCODE_LINUX_2(CREATE_WORKQUEUE_PC, DIAG_SEVERITY_ERR); | |
1749 | rc = -ENOMEM; | |
1750 | goto away; | |
1751 | } | |
1752 | ||
1753 | /* This enables us to receive notifications when devices appear for | |
1754 | * which this service partition is to be a server for. | |
1755 | */ | |
4da3336c DK |
1756 | visorchipset_register_busdev(&chipset_notifiers, |
1757 | &chipset_responders, | |
1758 | &chipset_driverinfo); | |
3703987c EA |
1759 | |
1760 | rc = 0; | |
1761 | ||
1762 | away: | |
1763 | if (rc) | |
1764 | POSTCODE_LINUX_3(CHIPSET_INIT_FAILURE_PC, rc, | |
1765 | POSTCODE_SEVERITY_ERR); | |
1766 | return rc; | |
1767 | } | |
1768 | ||
c79b28f7 | 1769 | void |
3703987c EA |
1770 | visorbus_exit(void) |
1771 | { | |
1772 | struct list_head *listentry, *listtmp; | |
1773 | ||
4da3336c | 1774 | visorchipset_register_busdev(NULL, NULL, NULL); |
3703987c EA |
1775 | remove_all_visor_devices(); |
1776 | ||
1777 | flush_workqueue(periodic_dev_workqueue); /* better not be any work! */ | |
1778 | destroy_workqueue(periodic_dev_workqueue); | |
1779 | periodic_dev_workqueue = NULL; | |
1780 | ||
1781 | if (periodic_test_workqueue) { | |
1782 | cancel_delayed_work(&periodic_work); | |
1783 | flush_workqueue(periodic_test_workqueue); | |
1784 | destroy_workqueue(periodic_test_workqueue); | |
1785 | periodic_test_workqueue = NULL; | |
1786 | } | |
1787 | ||
1788 | list_for_each_safe(listentry, listtmp, &list_all_bus_instances) { | |
1789 | struct visorbus_devdata *devdata = list_entry(listentry, | |
1790 | struct | |
1791 | visorbus_devdata, | |
1792 | list_all); | |
1793 | remove_bus_instance(devdata); | |
1794 | } | |
1795 | remove_bus_type(); | |
1796 | } | |
1797 | ||
1798 | module_param_named(debug, visorbus_debug, int, S_IRUGO); | |
1799 | MODULE_PARM_DESC(visorbus_debug, "1 to debug"); | |
1800 | int visorbus_debug = 0; | |
1801 | ||
1802 | module_param_named(forcematch, visorbus_forcematch, int, S_IRUGO); | |
1803 | MODULE_PARM_DESC(visorbus_forcematch, | |
1804 | "1 to force a successful dev <--> drv match"); | |
1805 | int visorbus_forcematch = 0; | |
1806 | ||
1807 | module_param_named(forcenomatch, visorbus_forcenomatch, int, S_IRUGO); | |
1808 | MODULE_PARM_DESC(visorbus_forcenomatch, | |
1809 | "1 to force an UNsuccessful dev <--> drv match"); | |
1810 | int visorbus_forcenomatch = 0; | |
1811 | ||
1812 | module_param_named(devicetest, visorbus_devicetest, int, S_IRUGO); | |
1813 | MODULE_PARM_DESC(visorbus_devicetest, | |
1814 | "non-0 to just test device creation and destruction"); | |
1815 | int visorbus_devicetest = 0; | |
1816 | ||
1817 | module_param_named(debugref, visorbus_debugref, int, S_IRUGO); | |
1818 | MODULE_PARM_DESC(visorbus_debugref, "1 to debug reference counting"); | |
1819 | int visorbus_debugref = 0; | |
1820 | ||
3703987c EA |
1821 | MODULE_AUTHOR("Unisys"); |
1822 | MODULE_LICENSE("GPL"); | |
1823 | MODULE_DESCRIPTION("Supervisor bus driver for service partition: ver " VERSION); | |
1824 | MODULE_VERSION(VERSION); |