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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; | |
3703987c EA |
185 | int i; |
186 | struct visor_device *dev; | |
187 | struct visor_driver *drv; | |
188 | ||
189 | dev = to_visor_device(xdev); | |
190 | drv = to_visor_driver(xdrv); | |
191 | channel_type = visorchannel_get_uuid(dev->visorchannel); | |
3703987c | 192 | |
8e33f48c DK |
193 | if (visorbus_forcematch) |
194 | return 1; | |
195 | if (visorbus_forcenomatch) | |
196 | return 0; | |
3703987c | 197 | if (!drv->channel_types) |
8e33f48c DK |
198 | return 0; |
199 | ||
3703987c EA |
200 | for (i = 0; |
201 | (uuid_le_cmp(drv->channel_types[i].guid, NULL_UUID_LE) != 0) || | |
202 | (drv->channel_types[i].name); | |
203 | i++) | |
204 | if (uuid_le_cmp(drv->channel_types[i].guid, | |
8e33f48c DK |
205 | channel_type) == 0) |
206 | return i + 1; | |
207 | ||
208 | return 0; | |
3703987c EA |
209 | } |
210 | ||
211 | /** This is called when device_unregister() is called for the bus device | |
212 | * instance, after all other tasks involved with destroying the device | |
213 | * are complete. | |
214 | */ | |
215 | static void | |
216 | visorbus_release_busdevice(struct device *xdev) | |
217 | { | |
343506bf | 218 | struct visor_device *dev = dev_get_drvdata(xdev); |
3703987c | 219 | |
343506bf | 220 | kfree(dev); |
3703987c EA |
221 | } |
222 | ||
223 | /** This is called when device_unregister() is called for each child | |
224 | * device instance. | |
225 | */ | |
226 | static void | |
227 | visorbus_release_device(struct device *xdev) | |
228 | { | |
229 | struct visor_device *dev = to_visor_device(xdev); | |
230 | ||
231 | if (dev->periodic_work) { | |
232 | visor_periodic_work_destroy(dev->periodic_work); | |
233 | dev->periodic_work = NULL; | |
234 | } | |
235 | if (dev->visorchannel) { | |
236 | visorchannel_destroy(dev->visorchannel); | |
237 | dev->visorchannel = NULL; | |
238 | } | |
239 | kfree(dev); | |
240 | } | |
241 | ||
826b6a0f PB |
242 | /* begin implementation of specific channel attributes to appear under |
243 | * /sys/bus/visorbus<x>/dev<y>/channel | |
244 | */ | |
79573162 DZ |
245 | static ssize_t physaddr_show(struct device *dev, struct device_attribute *attr, |
246 | char *buf) | |
826b6a0f | 247 | { |
79573162 DZ |
248 | struct visor_device *vdev = to_visor_device(dev); |
249 | ||
250 | if (!vdev->visorchannel) | |
826b6a0f PB |
251 | return 0; |
252 | return snprintf(buf, PAGE_SIZE, "0x%Lx\n", | |
79573162 | 253 | visorchannel_get_physaddr(vdev->visorchannel)); |
826b6a0f PB |
254 | } |
255 | ||
79573162 DZ |
256 | static ssize_t nbytes_show(struct device *dev, struct device_attribute *attr, |
257 | char *buf) | |
826b6a0f | 258 | { |
79573162 DZ |
259 | struct visor_device *vdev = to_visor_device(dev); |
260 | ||
261 | if (!vdev->visorchannel) | |
826b6a0f PB |
262 | return 0; |
263 | return snprintf(buf, PAGE_SIZE, "0x%lx\n", | |
79573162 | 264 | visorchannel_get_nbytes(vdev->visorchannel)); |
826b6a0f PB |
265 | } |
266 | ||
79573162 DZ |
267 | static ssize_t clientpartition_show(struct device *dev, |
268 | struct device_attribute *attr, char *buf) | |
269 | { | |
270 | struct visor_device *vdev = to_visor_device(dev); | |
271 | ||
272 | if (!vdev->visorchannel) | |
826b6a0f PB |
273 | return 0; |
274 | return snprintf(buf, PAGE_SIZE, "0x%Lx\n", | |
79573162 | 275 | visorchannel_get_clientpartition(vdev->visorchannel)); |
826b6a0f PB |
276 | } |
277 | ||
79573162 DZ |
278 | static ssize_t typeguid_show(struct device *dev, struct device_attribute *attr, |
279 | char *buf) | |
826b6a0f | 280 | { |
79573162 | 281 | struct visor_device *vdev = to_visor_device(dev); |
826b6a0f PB |
282 | char s[99]; |
283 | ||
79573162 | 284 | if (!vdev->visorchannel) |
826b6a0f PB |
285 | return 0; |
286 | return snprintf(buf, PAGE_SIZE, "%s\n", | |
79573162 | 287 | visorchannel_id(vdev->visorchannel, s)); |
826b6a0f PB |
288 | } |
289 | ||
79573162 DZ |
290 | static ssize_t zoneguid_show(struct device *dev, struct device_attribute *attr, |
291 | char *buf) | |
826b6a0f | 292 | { |
79573162 | 293 | struct visor_device *vdev = to_visor_device(dev); |
826b6a0f PB |
294 | char s[99]; |
295 | ||
79573162 | 296 | if (!vdev->visorchannel) |
826b6a0f PB |
297 | return 0; |
298 | return snprintf(buf, PAGE_SIZE, "%s\n", | |
79573162 | 299 | visorchannel_zoneid(vdev->visorchannel, s)); |
826b6a0f PB |
300 | } |
301 | ||
79573162 DZ |
302 | static ssize_t typename_show(struct device *dev, struct device_attribute *attr, |
303 | char *buf) | |
826b6a0f | 304 | { |
79573162 | 305 | struct visor_device *vdev = to_visor_device(dev); |
826b6a0f | 306 | int i = 0; |
79573162 DZ |
307 | struct bus_type *xbus = dev->bus; |
308 | struct device_driver *xdrv = dev->driver; | |
826b6a0f PB |
309 | struct visor_driver *drv = NULL; |
310 | ||
79573162 | 311 | if (!vdev->visorchannel || !xbus || !xdrv) |
826b6a0f | 312 | return 0; |
79573162 | 313 | i = xbus->match(dev, xdrv); |
826b6a0f PB |
314 | if (!i) |
315 | return 0; | |
316 | drv = to_visor_driver(xdrv); | |
317 | return snprintf(buf, PAGE_SIZE, "%s\n", drv->channel_types[i - 1].name); | |
318 | } | |
319 | ||
79573162 DZ |
320 | static DEVICE_ATTR_RO(physaddr); |
321 | static DEVICE_ATTR_RO(nbytes); | |
322 | static DEVICE_ATTR_RO(clientpartition); | |
323 | static DEVICE_ATTR_RO(typeguid); | |
324 | static DEVICE_ATTR_RO(zoneguid); | |
325 | static DEVICE_ATTR_RO(typename); | |
79573162 DZ |
326 | |
327 | static struct attribute *channel_attrs[] = { | |
328 | &dev_attr_physaddr.attr, | |
329 | &dev_attr_nbytes.attr, | |
330 | &dev_attr_clientpartition.attr, | |
331 | &dev_attr_typeguid.attr, | |
332 | &dev_attr_zoneguid.attr, | |
333 | &dev_attr_typename.attr, | |
fd012d0d | 334 | NULL |
826b6a0f PB |
335 | }; |
336 | ||
79573162 DZ |
337 | static struct attribute_group channel_attr_grp = { |
338 | .name = "channel", | |
339 | .attrs = channel_attrs, | |
826b6a0f PB |
340 | }; |
341 | ||
59fd2c8b | 342 | static const struct attribute_group *visorbus_channel_groups[] = { |
79573162 DZ |
343 | &channel_attr_grp, |
344 | NULL | |
826b6a0f PB |
345 | }; |
346 | ||
79573162 | 347 | /* end implementation of specific channel attributes */ |
826b6a0f | 348 | |
3703987c EA |
349 | /* BUS instance attributes |
350 | * | |
351 | * define & implement display of bus attributes under | |
352 | * /sys/bus/visorbus/busses/visorbus<n>. | |
353 | * | |
354 | * This is a bit hoaky because the kernel does not yet have the infrastructure | |
355 | * to separate bus INSTANCE attributes from bus TYPE attributes... | |
356 | * so we roll our own. See businst.c / businst.h. | |
357 | * | |
358 | */ | |
359 | ||
d181dd03 DZ |
360 | static ssize_t partition_handle_show(struct device *dev, |
361 | struct device_attribute *attr, | |
362 | char *buf) { | |
5ecbd5d4 DZ |
363 | struct visor_device *vdev = to_visor_device(dev); |
364 | u64 handle = visorchannel_get_clientpartition(vdev->visorchannel); | |
3703987c | 365 | |
5ecbd5d4 | 366 | return snprintf(buf, PAGE_SIZE, "0x%Lx\n", handle); |
3703987c EA |
367 | } |
368 | ||
d181dd03 DZ |
369 | static ssize_t partition_guid_show(struct device *dev, |
370 | struct device_attribute *attr, | |
371 | char *buf) { | |
5ecbd5d4 | 372 | struct visor_device *vdev = to_visor_device(dev); |
3703987c | 373 | |
5ecbd5d4 | 374 | return snprintf(buf, PAGE_SIZE, "{%pUb}\n", &vdev->partition_uuid); |
3703987c EA |
375 | } |
376 | ||
d181dd03 DZ |
377 | static ssize_t partition_name_show(struct device *dev, |
378 | struct device_attribute *attr, | |
379 | char *buf) { | |
5ecbd5d4 | 380 | struct visor_device *vdev = to_visor_device(dev); |
3703987c | 381 | |
5ecbd5d4 | 382 | return snprintf(buf, PAGE_SIZE, "%s\n", vdev->name); |
3703987c EA |
383 | } |
384 | ||
d181dd03 DZ |
385 | static ssize_t channel_addr_show(struct device *dev, |
386 | struct device_attribute *attr, | |
387 | char *buf) { | |
5ecbd5d4 DZ |
388 | struct visor_device *vdev = to_visor_device(dev); |
389 | u64 addr = visorchannel_get_physaddr(vdev->visorchannel); | |
3703987c | 390 | |
5ecbd5d4 | 391 | return snprintf(buf, PAGE_SIZE, "0x%Lx\n", addr); |
3703987c EA |
392 | } |
393 | ||
d181dd03 DZ |
394 | static ssize_t channel_bytes_show(struct device *dev, |
395 | struct device_attribute *attr, | |
396 | char *buf) { | |
5ecbd5d4 DZ |
397 | struct visor_device *vdev = to_visor_device(dev); |
398 | u64 nbytes = visorchannel_get_nbytes(vdev->visorchannel); | |
3703987c | 399 | |
5ecbd5d4 | 400 | return snprintf(buf, PAGE_SIZE, "0x%Lx\n", nbytes); |
3703987c EA |
401 | } |
402 | ||
d181dd03 DZ |
403 | static ssize_t channel_id_show(struct device *dev, |
404 | struct device_attribute *attr, | |
405 | char *buf) { | |
5ecbd5d4 | 406 | struct visor_device *vdev = to_visor_device(dev); |
3703987c EA |
407 | int len = 0; |
408 | ||
5ecbd5d4 DZ |
409 | if (vdev->visorchannel) { |
410 | visorchannel_id(vdev->visorchannel, buf); | |
3703987c EA |
411 | len = strlen(buf); |
412 | buf[len++] = '\n'; | |
413 | } | |
414 | return len; | |
415 | } | |
416 | ||
d181dd03 DZ |
417 | static ssize_t client_bus_info_show(struct device *dev, |
418 | struct device_attribute *attr, | |
419 | char *buf) { | |
5ecbd5d4 DZ |
420 | struct visor_device *vdev = to_visor_device(dev); |
421 | struct visorchannel *channel = vdev->visorchannel; | |
422 | ||
3703987c EA |
423 | int i, x, remain = PAGE_SIZE; |
424 | unsigned long off; | |
425 | char *p = buf; | |
426 | u8 *partition_name; | |
427 | struct ultra_vbus_deviceinfo dev_info; | |
428 | ||
429 | partition_name = ""; | |
5ecbd5d4 DZ |
430 | if (channel) { |
431 | if (vdev->name) | |
432 | partition_name = vdev->name; | |
3703987c | 433 | x = snprintf(p, remain, |
65bd6e46 | 434 | "Client device / client driver info for %s partition (vbus #%d):\n", |
5ecbd5d4 | 435 | partition_name, vdev->chipset_dev_no); |
3703987c EA |
436 | p += x; |
437 | remain -= x; | |
5ecbd5d4 | 438 | x = visorchannel_read(channel, |
3703987c EA |
439 | offsetof(struct |
440 | spar_vbus_channel_protocol, | |
441 | chp_info), | |
442 | &dev_info, sizeof(dev_info)); | |
443 | if (x >= 0) { | |
444 | x = vbuschannel_devinfo_to_string(&dev_info, p, | |
445 | remain, -1); | |
446 | p += x; | |
447 | remain -= x; | |
448 | } | |
5ecbd5d4 | 449 | x = visorchannel_read(channel, |
3703987c EA |
450 | offsetof(struct |
451 | spar_vbus_channel_protocol, | |
452 | bus_info), | |
453 | &dev_info, sizeof(dev_info)); | |
454 | if (x >= 0) { | |
455 | x = vbuschannel_devinfo_to_string(&dev_info, p, | |
456 | remain, -1); | |
457 | p += x; | |
458 | remain -= x; | |
459 | } | |
460 | off = offsetof(struct spar_vbus_channel_protocol, dev_info); | |
461 | i = 0; | |
462 | while (off + sizeof(dev_info) <= | |
5ecbd5d4 DZ |
463 | visorchannel_get_nbytes(channel)) { |
464 | x = visorchannel_read(channel, | |
3703987c EA |
465 | off, &dev_info, sizeof(dev_info)); |
466 | if (x >= 0) { | |
467 | x = vbuschannel_devinfo_to_string | |
468 | (&dev_info, p, remain, i); | |
469 | p += x; | |
470 | remain -= x; | |
471 | } | |
472 | off += sizeof(dev_info); | |
473 | i++; | |
474 | } | |
475 | } | |
476 | return PAGE_SIZE - remain; | |
477 | } | |
478 | ||
d181dd03 DZ |
479 | static DEVICE_ATTR_RO(partition_handle); |
480 | static DEVICE_ATTR_RO(partition_guid); | |
481 | static DEVICE_ATTR_RO(partition_name); | |
482 | static DEVICE_ATTR_RO(channel_addr); | |
483 | static DEVICE_ATTR_RO(channel_bytes); | |
484 | static DEVICE_ATTR_RO(channel_id); | |
485 | static DEVICE_ATTR_RO(client_bus_info); | |
486 | ||
487 | static struct attribute *dev_attrs[] = { | |
488 | &dev_attr_partition_handle.attr, | |
489 | &dev_attr_partition_guid.attr, | |
490 | &dev_attr_partition_name.attr, | |
491 | &dev_attr_channel_addr.attr, | |
492 | &dev_attr_channel_bytes.attr, | |
493 | &dev_attr_channel_id.attr, | |
494 | &dev_attr_client_bus_info.attr, | |
495 | NULL | |
496 | }; | |
3703987c | 497 | |
d181dd03 DZ |
498 | static struct attribute_group dev_attr_grp = { |
499 | .attrs = dev_attrs, | |
500 | }; | |
3703987c | 501 | |
d181dd03 DZ |
502 | static const struct attribute_group *visorbus_groups[] = { |
503 | &dev_attr_grp, | |
504 | NULL | |
505 | }; | |
3703987c EA |
506 | |
507 | /* DRIVER attributes | |
508 | * | |
509 | * define & implement display of driver attributes under | |
510 | * /sys/bus/visorbus/drivers/<drivername>. | |
511 | * | |
512 | */ | |
513 | ||
514 | static ssize_t | |
515 | DRIVER_ATTR_version(struct device_driver *xdrv, char *buf) | |
516 | { | |
517 | struct visor_driver *drv = to_visor_driver(xdrv); | |
518 | ||
519 | return snprintf(buf, PAGE_SIZE, "%s\n", drv->version); | |
520 | } | |
521 | ||
522 | static int | |
523 | register_driver_attributes(struct visor_driver *drv) | |
524 | { | |
3703987c EA |
525 | struct driver_attribute version = |
526 | __ATTR(version, S_IRUGO, DRIVER_ATTR_version, NULL); | |
527 | drv->version_attr = version; | |
2cda64cf | 528 | return driver_create_file(&drv->driver, &drv->version_attr); |
3703987c EA |
529 | } |
530 | ||
531 | static void | |
532 | unregister_driver_attributes(struct visor_driver *drv) | |
533 | { | |
534 | driver_remove_file(&drv->driver, &drv->version_attr); | |
535 | } | |
536 | ||
3703987c EA |
537 | static void |
538 | dev_periodic_work(void *xdev) | |
539 | { | |
0df4e3e9 | 540 | struct visor_device *dev = xdev; |
3703987c EA |
541 | struct visor_driver *drv = to_visor_driver(dev->device.driver); |
542 | ||
543 | down(&dev->visordriver_callback_lock); | |
544 | if (drv->channel_interrupt) | |
545 | drv->channel_interrupt(dev); | |
546 | up(&dev->visordriver_callback_lock); | |
547 | if (!visor_periodic_work_nextperiod(dev->periodic_work)) | |
548 | put_device(&dev->device); | |
549 | } | |
550 | ||
551 | static void | |
552 | dev_start_periodic_work(struct visor_device *dev) | |
553 | { | |
554 | if (dev->being_removed) | |
555 | return; | |
556 | /* now up by at least 2 */ | |
557 | get_device(&dev->device); | |
558 | if (!visor_periodic_work_start(dev->periodic_work)) | |
559 | put_device(&dev->device); | |
560 | } | |
561 | ||
562 | static void | |
563 | dev_stop_periodic_work(struct visor_device *dev) | |
564 | { | |
565 | if (visor_periodic_work_stop(dev->periodic_work)) | |
566 | put_device(&dev->device); | |
567 | } | |
568 | ||
569 | /** This is called automatically upon adding a visor_device (device_add), or | |
570 | * adding a visor_driver (visorbus_register_visor_driver), but only after | |
571 | * visorbus_match has returned 1 to indicate a successful match between | |
572 | * driver and device. | |
573 | */ | |
574 | static int | |
575 | visordriver_probe_device(struct device *xdev) | |
576 | { | |
4000622e | 577 | int res; |
3703987c EA |
578 | struct visor_driver *drv; |
579 | struct visor_device *dev; | |
580 | ||
581 | drv = to_visor_driver(xdev->driver); | |
582 | dev = to_visor_device(xdev); | |
4000622e DK |
583 | |
584 | if (!drv->probe) | |
585 | return -ENODEV; | |
586 | ||
3703987c | 587 | down(&dev->visordriver_callback_lock); |
779d0752 | 588 | dev->being_removed = false; |
4000622e DK |
589 | |
590 | res = drv->probe(dev); | |
591 | if (res >= 0) { | |
592 | /* success: reference kept via unmatched get_device() */ | |
593 | get_device(&dev->device); | |
594 | fix_vbus_dev_info(dev); | |
3703987c | 595 | } |
3703987c | 596 | |
3703987c | 597 | up(&dev->visordriver_callback_lock); |
4000622e | 598 | return res; |
3703987c EA |
599 | } |
600 | ||
601 | /** This is called when device_unregister() is called for each child device | |
602 | * instance, to notify the appropriate visorbus_driver that the device is | |
603 | * going away, and to decrease the reference count of the device. | |
604 | */ | |
605 | static int | |
606 | visordriver_remove_device(struct device *xdev) | |
607 | { | |
3703987c EA |
608 | struct visor_device *dev; |
609 | struct visor_driver *drv; | |
610 | ||
611 | dev = to_visor_device(xdev); | |
612 | drv = to_visor_driver(xdev->driver); | |
613 | down(&dev->visordriver_callback_lock); | |
779d0752 | 614 | dev->being_removed = true; |
3703987c EA |
615 | /* |
616 | * ensure that the dev->being_removed flag is set before we start the | |
617 | * actual removal | |
618 | */ | |
619 | wmb(); | |
620 | if (drv) { | |
621 | if (drv->remove) | |
622 | drv->remove(dev); | |
623 | } | |
624 | up(&dev->visordriver_callback_lock); | |
625 | dev_stop_periodic_work(dev); | |
3703987c EA |
626 | |
627 | put_device(&dev->device); | |
628 | ||
df7f46e8 | 629 | return 0; |
3703987c EA |
630 | } |
631 | ||
632 | /** A particular type of visor driver calls this function to register | |
633 | * the driver. The caller MUST fill in the following fields within the | |
634 | * #drv structure: | |
635 | * name, version, owner, channel_types, probe, remove | |
636 | * | |
637 | * Here's how the whole Linux bus / driver / device model works. | |
638 | * | |
639 | * At system start-up, the visorbus kernel module is loaded, which registers | |
640 | * visorbus_type as a bus type, using bus_register(). | |
641 | * | |
642 | * All kernel modules that support particular device types on a | |
643 | * visorbus bus are loaded. Each of these kernel modules calls | |
644 | * visorbus_register_visor_driver() in their init functions, passing a | |
645 | * visor_driver struct. visorbus_register_visor_driver() in turn calls | |
646 | * register_driver(&visor_driver.driver). This .driver member is | |
647 | * initialized with generic methods (like probe), whose sole responsibility | |
648 | * is to act as a broker for the real methods, which are within the | |
649 | * visor_driver struct. (This is the way the subclass behavior is | |
650 | * implemented, since visor_driver is essentially a subclass of the | |
651 | * generic driver.) Whenever a driver_register() happens, core bus code in | |
652 | * the kernel does (see device_attach() in drivers/base/dd.c): | |
653 | * | |
654 | * for each dev associated with the bus (the bus that driver is on) that | |
655 | * does not yet have a driver | |
656 | * if bus.match(dev,newdriver) == yes_matched ** .match specified | |
657 | * ** during bus_register(). | |
658 | * newdriver.probe(dev) ** for visor drivers, this will call | |
659 | * ** the generic driver.probe implemented in visorbus.c, | |
660 | * ** which in turn calls the probe specified within the | |
661 | * ** struct visor_driver (which was specified by the | |
662 | * ** actual device driver as part of | |
663 | * ** visorbus_register_visor_driver()). | |
664 | * | |
665 | * The above dance also happens when a new device appears. | |
666 | * So the question is, how are devices created within the system? | |
667 | * Basically, just call device_add(dev). See pci_bus_add_devices(). | |
668 | * pci_scan_device() shows an example of how to build a device struct. It | |
669 | * returns the newly-created struct to pci_scan_single_device(), who adds it | |
670 | * to the list of devices at PCIBUS.devices. That list of devices is what | |
671 | * is traversed by pci_bus_add_devices(). | |
672 | * | |
673 | */ | |
674 | int visorbus_register_visor_driver(struct visor_driver *drv) | |
675 | { | |
676 | int rc = 0; | |
677 | ||
6155a3cf BR |
678 | if (busreg_rc < 0) |
679 | return -ENODEV; /*can't register on a nonexistent bus*/ | |
680 | ||
3703987c EA |
681 | drv->driver.name = drv->name; |
682 | drv->driver.bus = &visorbus_type; | |
683 | drv->driver.probe = visordriver_probe_device; | |
684 | drv->driver.remove = visordriver_remove_device; | |
685 | drv->driver.owner = drv->owner; | |
686 | ||
687 | /* driver_register does this: | |
688 | * bus_add_driver(drv) | |
689 | * ->if (drv.bus) ** (bus_type) ** | |
690 | * driver_attach(drv) | |
691 | * for each dev with bus type of drv.bus | |
692 | * if (!dev.drv) ** no driver assigned yet ** | |
693 | * if (bus.match(dev,drv)) [visorbus_match] | |
694 | * dev.drv = drv | |
695 | * if (!drv.probe(dev)) [visordriver_probe_device] | |
696 | * dev.drv = NULL | |
697 | */ | |
698 | ||
699 | rc = driver_register(&drv->driver); | |
700 | if (rc < 0) | |
701 | return rc; | |
702 | rc = register_driver_attributes(drv); | |
418627dd DK |
703 | if (rc < 0) |
704 | driver_unregister(&drv->driver); | |
3703987c EA |
705 | return rc; |
706 | } | |
707 | EXPORT_SYMBOL_GPL(visorbus_register_visor_driver); | |
708 | ||
709 | /** A particular type of visor driver calls this function to unregister | |
710 | * the driver, i.e., within its module_exit function. | |
711 | */ | |
712 | void | |
713 | visorbus_unregister_visor_driver(struct visor_driver *drv) | |
714 | { | |
715 | unregister_driver_attributes(drv); | |
716 | driver_unregister(&drv->driver); | |
717 | } | |
718 | EXPORT_SYMBOL_GPL(visorbus_unregister_visor_driver); | |
719 | ||
720 | int | |
721 | visorbus_read_channel(struct visor_device *dev, unsigned long offset, | |
722 | void *dest, unsigned long nbytes) | |
723 | { | |
724 | return visorchannel_read(dev->visorchannel, offset, dest, nbytes); | |
725 | } | |
726 | EXPORT_SYMBOL_GPL(visorbus_read_channel); | |
727 | ||
728 | int | |
729 | visorbus_write_channel(struct visor_device *dev, unsigned long offset, | |
730 | void *src, unsigned long nbytes) | |
731 | { | |
732 | return visorchannel_write(dev->visorchannel, offset, src, nbytes); | |
733 | } | |
734 | EXPORT_SYMBOL_GPL(visorbus_write_channel); | |
735 | ||
736 | int | |
737 | visorbus_clear_channel(struct visor_device *dev, unsigned long offset, u8 ch, | |
738 | unsigned long nbytes) | |
739 | { | |
740 | return visorchannel_clear(dev->visorchannel, offset, ch, nbytes); | |
741 | } | |
742 | EXPORT_SYMBOL_GPL(visorbus_clear_channel); | |
743 | ||
3703987c EA |
744 | /** We don't really have a real interrupt, so for now we just call the |
745 | * interrupt function periodically... | |
746 | */ | |
747 | void | |
748 | visorbus_enable_channel_interrupts(struct visor_device *dev) | |
749 | { | |
750 | dev_start_periodic_work(dev); | |
751 | } | |
752 | EXPORT_SYMBOL_GPL(visorbus_enable_channel_interrupts); | |
753 | ||
754 | void | |
755 | visorbus_disable_channel_interrupts(struct visor_device *dev) | |
756 | { | |
757 | dev_stop_periodic_work(dev); | |
758 | } | |
759 | EXPORT_SYMBOL_GPL(visorbus_disable_channel_interrupts); | |
760 | ||
761 | /** This is how everything starts from the device end. | |
762 | * This function is called when a channel first appears via a ControlVM | |
763 | * message. In response, this function allocates a visor_device to | |
764 | * correspond to the new channel, and attempts to connect it the appropriate | |
765 | * driver. If the appropriate driver is found, the visor_driver.probe() | |
766 | * function for that driver will be called, and will be passed the new | |
767 | * visor_device that we just created. | |
768 | * | |
769 | * It's ok if the appropriate driver is not yet loaded, because in that case | |
770 | * the new device struct will just stick around in the bus' list of devices. | |
771 | * When the appropriate driver calls visorbus_register_visor_driver(), the | |
772 | * visor_driver.probe() for the new driver will be called with the new | |
773 | * device. | |
774 | */ | |
775 | static int | |
a298bc0b | 776 | create_visor_device(struct visor_device *dev) |
3703987c | 777 | { |
f99d3308 | 778 | int rc; |
a298bc0b DZ |
779 | u32 chipset_bus_no = dev->chipset_bus_no; |
780 | u32 chipset_dev_no = dev->chipset_dev_no; | |
3703987c EA |
781 | |
782 | POSTCODE_LINUX_4(DEVICE_CREATE_ENTRY_PC, chipset_dev_no, chipset_bus_no, | |
783 | POSTCODE_SEVERITY_INFO); | |
3703987c | 784 | |
3703987c EA |
785 | sema_init(&dev->visordriver_callback_lock, 1); /* unlocked */ |
786 | dev->device.bus = &visorbus_type; | |
59fd2c8b | 787 | dev->device.groups = visorbus_channel_groups; |
3703987c EA |
788 | device_initialize(&dev->device); |
789 | dev->device.release = visorbus_release_device; | |
790 | /* keep a reference just for us (now 2) */ | |
791 | get_device(&dev->device); | |
3703987c EA |
792 | dev->periodic_work = |
793 | visor_periodic_work_create(POLLJIFFIES_NORMALCHANNEL, | |
794 | periodic_dev_workqueue, | |
795 | dev_periodic_work, | |
796 | dev, dev_name(&dev->device)); | |
797 | if (!dev->periodic_work) { | |
798 | POSTCODE_LINUX_3(DEVICE_CREATE_FAILURE_PC, chipset_dev_no, | |
799 | DIAG_SEVERITY_ERR); | |
f99d3308 | 800 | rc = -EINVAL; |
3703987c EA |
801 | goto away; |
802 | } | |
803 | ||
804 | /* bus_id must be a unique name with respect to this bus TYPE | |
805 | * (NOT bus instance). That's why we need to include the bus | |
806 | * number within the name. | |
807 | */ | |
b4b598fd | 808 | dev_set_name(&dev->device, "vbus%u:dev%u", |
3703987c EA |
809 | chipset_bus_no, chipset_dev_no); |
810 | ||
811 | /* device_add does this: | |
812 | * bus_add_device(dev) | |
813 | * ->device_attach(dev) | |
814 | * ->for each driver drv registered on the bus that dev is on | |
815 | * if (dev.drv) ** device already has a driver ** | |
816 | * ** not sure we could ever get here... ** | |
817 | * else | |
818 | * if (bus.match(dev,drv)) [visorbus_match] | |
819 | * dev.drv = drv | |
820 | * if (!drv.probe(dev)) [visordriver_probe_device] | |
821 | * dev.drv = NULL | |
822 | * | |
823 | * Note that device_add does NOT fail if no driver failed to | |
824 | * claim the device. The device will be linked onto | |
825 | * bus_type.klist_devices regardless (use bus_for_each_dev). | |
826 | */ | |
827 | rc = device_add(&dev->device); | |
828 | if (rc < 0) { | |
829 | POSTCODE_LINUX_3(DEVICE_ADD_PC, chipset_bus_no, | |
830 | DIAG_SEVERITY_ERR); | |
831 | goto away; | |
832 | } | |
833 | ||
a298bc0b DZ |
834 | list_add_tail(&dev->list_all, &list_all_device_instances); |
835 | return 0; | |
3703987c EA |
836 | |
837 | away: | |
a298bc0b | 838 | put_device(&dev->device); |
3703987c EA |
839 | return rc; |
840 | } | |
841 | ||
842 | static void | |
843 | remove_visor_device(struct visor_device *dev) | |
844 | { | |
845 | list_del(&dev->list_all); | |
3703987c EA |
846 | put_device(&dev->device); |
847 | device_unregister(&dev->device); | |
848 | } | |
849 | ||
3703987c EA |
850 | static int |
851 | get_vbus_header_info(struct visorchannel *chan, | |
852 | struct spar_vbus_headerinfo *hdr_info) | |
853 | { | |
3703987c | 854 | if (!SPAR_VBUS_CHANNEL_OK_CLIENT(visorchannel_get_header(chan))) |
f748f64f BR |
855 | return -EINVAL; |
856 | ||
3703987c EA |
857 | if (visorchannel_read(chan, sizeof(struct channel_header), hdr_info, |
858 | sizeof(*hdr_info)) < 0) { | |
f748f64f | 859 | return -EIO; |
3703987c EA |
860 | } |
861 | if (hdr_info->struct_bytes < sizeof(struct spar_vbus_headerinfo)) | |
f748f64f BR |
862 | return -EINVAL; |
863 | ||
3703987c EA |
864 | if (hdr_info->device_info_struct_bytes < |
865 | sizeof(struct ultra_vbus_deviceinfo)) { | |
f748f64f | 866 | return -EINVAL; |
3703987c | 867 | } |
f748f64f | 868 | return 0; |
3703987c EA |
869 | } |
870 | ||
871 | /* Write the contents of <info> to the struct | |
48117895 GL |
872 | * spar_vbus_channel_protocol.chp_info. |
873 | */ | |
3703987c EA |
874 | |
875 | static int | |
876 | write_vbus_chp_info(struct visorchannel *chan, | |
877 | struct spar_vbus_headerinfo *hdr_info, | |
878 | struct ultra_vbus_deviceinfo *info) | |
879 | { | |
880 | int off = sizeof(struct channel_header) + hdr_info->chp_info_offset; | |
881 | ||
882 | if (hdr_info->chp_info_offset == 0) | |
216c3e2c | 883 | return -1; |
3703987c EA |
884 | |
885 | if (visorchannel_write(chan, off, info, sizeof(*info)) < 0) | |
216c3e2c | 886 | return -1; |
3703987c EA |
887 | return 0; |
888 | } | |
889 | ||
890 | /* Write the contents of <info> to the struct | |
48117895 GL |
891 | * spar_vbus_channel_protocol.bus_info. |
892 | */ | |
3703987c EA |
893 | |
894 | static int | |
895 | write_vbus_bus_info(struct visorchannel *chan, | |
896 | struct spar_vbus_headerinfo *hdr_info, | |
897 | struct ultra_vbus_deviceinfo *info) | |
898 | { | |
899 | int off = sizeof(struct channel_header) + hdr_info->bus_info_offset; | |
900 | ||
901 | if (hdr_info->bus_info_offset == 0) | |
216c3e2c | 902 | return -1; |
3703987c EA |
903 | |
904 | if (visorchannel_write(chan, off, info, sizeof(*info)) < 0) | |
216c3e2c | 905 | return -1; |
3703987c EA |
906 | return 0; |
907 | } | |
908 | ||
909 | /* Write the contents of <info> to the | |
910 | * struct spar_vbus_channel_protocol.dev_info[<devix>]. | |
911 | */ | |
912 | static int | |
913 | write_vbus_dev_info(struct visorchannel *chan, | |
914 | struct spar_vbus_headerinfo *hdr_info, | |
915 | struct ultra_vbus_deviceinfo *info, int devix) | |
916 | { | |
917 | int off = | |
918 | (sizeof(struct channel_header) + hdr_info->dev_info_offset) + | |
919 | (hdr_info->device_info_struct_bytes * devix); | |
920 | ||
921 | if (hdr_info->dev_info_offset == 0) | |
216c3e2c | 922 | return -1; |
3703987c EA |
923 | |
924 | if (visorchannel_write(chan, off, info, sizeof(*info)) < 0) | |
216c3e2c | 925 | return -1; |
3703987c EA |
926 | return 0; |
927 | } | |
928 | ||
929 | /* For a child device just created on a client bus, fill in | |
930 | * information about the driver that is controlling this device into | |
931 | * the the appropriate slot within the vbus channel of the bus | |
932 | * instance. | |
933 | */ | |
934 | static void | |
935 | fix_vbus_dev_info(struct visor_device *visordev) | |
936 | { | |
937 | int i; | |
d32517e3 | 938 | struct visor_device *bdev; |
3703987c EA |
939 | struct visor_driver *visordrv; |
940 | int bus_no = visordev->chipset_bus_no; | |
941 | int dev_no = visordev->chipset_dev_no; | |
942 | struct ultra_vbus_deviceinfo dev_info; | |
943 | const char *chan_type_name = NULL; | |
7726f813 | 944 | struct spar_vbus_headerinfo *hdr_info; |
3703987c EA |
945 | |
946 | if (!visordev->device.driver) | |
216c3e2c | 947 | return; |
3703987c | 948 | |
7726f813 | 949 | hdr_info = (struct spar_vbus_headerinfo *)visordev->vbus_hdr_info; |
d32517e3 DZ |
950 | if (!hdr_info) |
951 | return; | |
7726f813 | 952 | |
d32517e3 DZ |
953 | bdev = visorbus_get_device_by_id(bus_no, BUS_ROOT_DEVICE, NULL); |
954 | if (!bdev) | |
955 | return; | |
3703987c | 956 | |
d32517e3 | 957 | visordrv = to_visor_driver(visordev->device.driver); |
3703987c EA |
958 | |
959 | /* Within the list of device types (by GUID) that the driver | |
960 | * says it supports, find out which one of those types matches | |
961 | * the type of this device, so that we can include the device | |
962 | * type name | |
963 | */ | |
964 | for (i = 0; visordrv->channel_types[i].name; i++) { | |
d5b3f1dc EA |
965 | if (memcmp(&visordrv->channel_types[i].guid, |
966 | &visordev->channel_type_guid, | |
967 | sizeof(visordrv->channel_types[i].guid)) == 0) { | |
3703987c EA |
968 | chan_type_name = visordrv->channel_types[i].name; |
969 | break; | |
970 | } | |
971 | } | |
972 | ||
973 | bus_device_info_init(&dev_info, chan_type_name, | |
974 | visordrv->name, visordrv->version, | |
975 | visordrv->vertag); | |
d32517e3 | 976 | write_vbus_dev_info(bdev->visorchannel, hdr_info, &dev_info, dev_no); |
3703987c EA |
977 | |
978 | /* Re-write bus+chipset info, because it is possible that this | |
979 | * was previously written by our evil counterpart, virtpci. | |
980 | */ | |
d32517e3 DZ |
981 | write_vbus_chp_info(bdev->visorchannel, hdr_info, &chipset_driverinfo); |
982 | write_vbus_bus_info(bdev->visorchannel, hdr_info, | |
983 | &clientbus_driverinfo); | |
3703987c EA |
984 | } |
985 | ||
986 | /** Create a device instance for the visor bus itself. | |
987 | */ | |
d32517e3 DZ |
988 | static int |
989 | create_bus_instance(struct visor_device *dev) | |
3703987c | 990 | { |
d32517e3 | 991 | int id = dev->chipset_bus_no; |
7726f813 | 992 | struct spar_vbus_headerinfo *hdr_info; |
3703987c EA |
993 | |
994 | POSTCODE_LINUX_2(BUS_CREATE_ENTRY_PC, POSTCODE_SEVERITY_INFO); | |
7726f813 DZ |
995 | |
996 | hdr_info = kzalloc(sizeof(*hdr_info), GFP_KERNEL); | |
c2c667d6 BR |
997 | if (!hdr_info) |
998 | return -ENOMEM; | |
7726f813 | 999 | |
343506bf DZ |
1000 | dev_set_name(&dev->device, "visorbus%d", id); |
1001 | dev->device.bus = &visorbus_type; | |
1002 | dev->device.groups = visorbus_groups; | |
1003 | dev->device.release = visorbus_release_busdevice; | |
d32517e3 | 1004 | |
343506bf | 1005 | if (device_register(&dev->device) < 0) { |
3703987c EA |
1006 | POSTCODE_LINUX_3(DEVICE_CREATE_FAILURE_PC, id, |
1007 | POSTCODE_SEVERITY_ERR); | |
c2c667d6 BR |
1008 | kfree(hdr_info); |
1009 | return -ENODEV; | |
3703987c | 1010 | } |
d32517e3 | 1011 | |
ee983d90 DZ |
1012 | if (get_vbus_header_info(dev->visorchannel, hdr_info) >= 0) { |
1013 | dev->vbus_hdr_info = (void *)hdr_info; | |
1014 | write_vbus_chp_info(dev->visorchannel, hdr_info, | |
1015 | &chipset_driverinfo); | |
1016 | write_vbus_bus_info(dev->visorchannel, hdr_info, | |
1017 | &clientbus_driverinfo); | |
b32c4997 | 1018 | } else { |
ee983d90 | 1019 | kfree(hdr_info); |
3703987c | 1020 | } |
3703987c | 1021 | bus_count++; |
343506bf | 1022 | list_add_tail(&dev->list_all, &list_all_bus_instances); |
343506bf | 1023 | dev_set_drvdata(&dev->device, dev); |
d32517e3 | 1024 | return 0; |
3703987c EA |
1025 | } |
1026 | ||
1027 | /** Remove a device instance for the visor bus itself. | |
1028 | */ | |
1029 | static void | |
343506bf | 1030 | remove_bus_instance(struct visor_device *dev) |
3703987c EA |
1031 | { |
1032 | /* Note that this will result in the release method for | |
343506bf | 1033 | * dev->dev being called, which will call |
3703987c EA |
1034 | * visorbus_release_busdevice(). This has something to do with |
1035 | * the put_device() done in device_unregister(), but I have never | |
1036 | * successfully been able to trace thru the code to see where/how | |
1037 | * release() gets called. But I know it does. | |
1038 | */ | |
3703987c | 1039 | bus_count--; |
343506bf DZ |
1040 | if (dev->visorchannel) { |
1041 | visorchannel_destroy(dev->visorchannel); | |
1042 | dev->visorchannel = NULL; | |
3703987c | 1043 | } |
343506bf DZ |
1044 | kfree(dev->vbus_hdr_info); |
1045 | list_del(&dev->list_all); | |
1046 | device_unregister(&dev->device); | |
3703987c EA |
1047 | } |
1048 | ||
1049 | /** Create and register the one-and-only one instance of | |
1050 | * the visor bus type (visorbus_type). | |
1051 | */ | |
1052 | static int | |
1053 | create_bus_type(void) | |
1054 | { | |
6155a3cf BR |
1055 | busreg_rc = bus_register(&visorbus_type); |
1056 | return busreg_rc; | |
3703987c EA |
1057 | } |
1058 | ||
1059 | /** Remove the one-and-only one instance of the visor bus type (visorbus_type). | |
1060 | */ | |
1061 | static void | |
1062 | remove_bus_type(void) | |
1063 | { | |
3703987c EA |
1064 | bus_unregister(&visorbus_type); |
1065 | } | |
1066 | ||
1067 | /** Remove all child visor bus device instances. | |
1068 | */ | |
1069 | static void | |
1070 | remove_all_visor_devices(void) | |
1071 | { | |
1072 | struct list_head *listentry, *listtmp; | |
1073 | ||
1074 | list_for_each_safe(listentry, listtmp, &list_all_device_instances) { | |
1075 | struct visor_device *dev = list_entry(listentry, | |
1076 | struct visor_device, | |
1077 | list_all); | |
1078 | remove_visor_device(dev); | |
1079 | } | |
1080 | } | |
1081 | ||
3703987c | 1082 | static void |
d32517e3 | 1083 | chipset_bus_create(struct visor_device *dev) |
3703987c | 1084 | { |
d32517e3 DZ |
1085 | int rc; |
1086 | u32 bus_no = dev->chipset_bus_no; | |
3703987c EA |
1087 | |
1088 | POSTCODE_LINUX_3(BUS_CREATE_ENTRY_PC, bus_no, POSTCODE_SEVERITY_INFO); | |
d32517e3 | 1089 | rc = create_bus_instance(dev); |
3703987c | 1090 | POSTCODE_LINUX_3(BUS_CREATE_EXIT_PC, bus_no, POSTCODE_SEVERITY_INFO); |
d32517e3 DZ |
1091 | |
1092 | if (rc < 0) | |
3703987c EA |
1093 | POSTCODE_LINUX_3(BUS_CREATE_FAILURE_PC, bus_no, |
1094 | POSTCODE_SEVERITY_ERR); | |
d32517e3 DZ |
1095 | else |
1096 | POSTCODE_LINUX_3(CHIPSET_INIT_SUCCESS_PC, bus_no, | |
1097 | POSTCODE_SEVERITY_INFO); | |
1098 | ||
3703987c | 1099 | if (chipset_responders.bus_create) |
d32517e3 | 1100 | (*chipset_responders.bus_create) (dev, rc); |
3703987c EA |
1101 | } |
1102 | ||
1103 | static void | |
d32517e3 | 1104 | chipset_bus_destroy(struct visor_device *dev) |
3703987c | 1105 | { |
343506bf | 1106 | remove_bus_instance(dev); |
3703987c | 1107 | if (chipset_responders.bus_destroy) |
d32517e3 | 1108 | (*chipset_responders.bus_destroy)(dev, 0); |
3703987c EA |
1109 | } |
1110 | ||
1111 | static void | |
a298bc0b | 1112 | chipset_device_create(struct visor_device *dev_info) |
3703987c | 1113 | { |
7a9749be | 1114 | int rc; |
a298bc0b DZ |
1115 | u32 bus_no = dev_info->chipset_bus_no; |
1116 | u32 dev_no = dev_info->chipset_dev_no; | |
3703987c EA |
1117 | |
1118 | POSTCODE_LINUX_4(DEVICE_CREATE_ENTRY_PC, dev_no, bus_no, | |
1119 | POSTCODE_SEVERITY_INFO); | |
1120 | ||
a298bc0b | 1121 | rc = create_visor_device(dev_info); |
86ea8acc DK |
1122 | if (chipset_responders.device_create) |
1123 | chipset_responders.device_create(dev_info, rc); | |
1124 | ||
1125 | if (rc < 0) | |
3703987c EA |
1126 | POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, dev_no, bus_no, |
1127 | POSTCODE_SEVERITY_ERR); | |
86ea8acc DK |
1128 | else |
1129 | POSTCODE_LINUX_4(DEVICE_CREATE_SUCCESS_PC, dev_no, bus_no, | |
1130 | POSTCODE_SEVERITY_INFO); | |
3703987c EA |
1131 | } |
1132 | ||
1133 | static void | |
a298bc0b | 1134 | chipset_device_destroy(struct visor_device *dev_info) |
3703987c | 1135 | { |
a298bc0b | 1136 | remove_visor_device(dev_info); |
3703987c EA |
1137 | |
1138 | if (chipset_responders.device_destroy) | |
a298bc0b | 1139 | (*chipset_responders.device_destroy) (dev_info, 0); |
3703987c EA |
1140 | } |
1141 | ||
1142 | /* This is the callback function specified for a function driver, to | |
1143 | * be called when a pending "pause device" operation has been | |
1144 | * completed. | |
1145 | */ | |
1146 | static void | |
a298bc0b | 1147 | pause_state_change_complete(struct visor_device *dev, int status) |
3703987c EA |
1148 | { |
1149 | if (!dev->pausing) | |
216c3e2c | 1150 | return; |
3703987c | 1151 | |
779d0752 | 1152 | dev->pausing = false; |
3703987c | 1153 | if (!chipset_responders.device_pause) /* this can never happen! */ |
216c3e2c | 1154 | return; |
3703987c EA |
1155 | |
1156 | /* Notify the chipset driver that the pause is complete, which | |
7005c16c EA |
1157 | * will presumably want to send some sort of response to the |
1158 | * initiator. | |
1159 | */ | |
a298bc0b | 1160 | (*chipset_responders.device_pause) (dev, status); |
3703987c EA |
1161 | } |
1162 | ||
1163 | /* This is the callback function specified for a function driver, to | |
1164 | * be called when a pending "resume device" operation has been | |
1165 | * completed. | |
1166 | */ | |
1167 | static void | |
a298bc0b | 1168 | resume_state_change_complete(struct visor_device *dev, int status) |
3703987c EA |
1169 | { |
1170 | if (!dev->resuming) | |
216c3e2c | 1171 | return; |
3703987c | 1172 | |
779d0752 | 1173 | dev->resuming = false; |
3703987c | 1174 | if (!chipset_responders.device_resume) /* this can never happen! */ |
216c3e2c | 1175 | return; |
3703987c EA |
1176 | |
1177 | /* Notify the chipset driver that the resume is complete, | |
1178 | * which will presumably want to send some sort of response to | |
48117895 GL |
1179 | * the initiator. |
1180 | */ | |
a298bc0b | 1181 | (*chipset_responders.device_resume) (dev, status); |
3703987c EA |
1182 | } |
1183 | ||
1184 | /* Tell the subordinate function driver for a specific device to pause | |
1185 | * or resume that device. Result is returned asynchronously via a | |
1186 | * callback function. | |
1187 | */ | |
1188 | static void | |
a298bc0b | 1189 | initiate_chipset_device_pause_resume(struct visor_device *dev, bool is_pause) |
3703987c | 1190 | { |
03b93f08 | 1191 | int rc; |
3703987c | 1192 | struct visor_driver *drv = NULL; |
a298bc0b | 1193 | void (*notify_func)(struct visor_device *dev, int response) = NULL; |
3703987c EA |
1194 | |
1195 | if (is_pause) | |
1196 | notify_func = chipset_responders.device_pause; | |
1197 | else | |
1198 | notify_func = chipset_responders.device_resume; | |
1199 | if (!notify_func) | |
03b93f08 | 1200 | return; |
3703987c | 1201 | |
3703987c | 1202 | drv = to_visor_driver(dev->device.driver); |
03b93f08 BR |
1203 | if (!drv) { |
1204 | (*notify_func)(dev, -ENODEV); | |
1205 | return; | |
1206 | } | |
3703987c | 1207 | |
03b93f08 BR |
1208 | if (dev->pausing || dev->resuming) { |
1209 | (*notify_func)(dev, -EBUSY); | |
1210 | return; | |
1211 | } | |
3703987c EA |
1212 | |
1213 | /* Note that even though both drv->pause() and drv->resume | |
1214 | * specify a callback function, it is NOT necessary for us to | |
1215 | * increment our local module usage count. Reason is, there | |
1216 | * is already a linkage dependency between child function | |
1217 | * drivers and visorbus, so it is already IMPOSSIBLE to unload | |
1218 | * visorbus while child function drivers are still running. | |
1219 | */ | |
1220 | if (is_pause) { | |
03b93f08 BR |
1221 | if (!drv->pause) { |
1222 | (*notify_func)(dev, -EINVAL); | |
1223 | return; | |
1224 | } | |
3703987c | 1225 | |
779d0752 | 1226 | dev->pausing = true; |
03b93f08 | 1227 | rc = drv->pause(dev, pause_state_change_complete); |
3703987c EA |
1228 | } else { |
1229 | /* This should be done at BUS resume time, but an | |
1230 | * existing problem prevents us from ever getting a bus | |
1231 | * resume... This hack would fail to work should we | |
1232 | * ever have a bus that contains NO devices, since we | |
48117895 GL |
1233 | * would never even get here in that case. |
1234 | */ | |
3703987c | 1235 | fix_vbus_dev_info(dev); |
03b93f08 BR |
1236 | if (!drv->resume) { |
1237 | (*notify_func)(dev, -EINVAL); | |
1238 | return; | |
1239 | } | |
3703987c | 1240 | |
779d0752 | 1241 | dev->resuming = true; |
03b93f08 | 1242 | rc = drv->resume(dev, resume_state_change_complete); |
3703987c | 1243 | } |
03b93f08 | 1244 | if (rc < 0) { |
3703987c | 1245 | if (is_pause) |
779d0752 | 1246 | dev->pausing = false; |
3703987c | 1247 | else |
779d0752 | 1248 | dev->resuming = false; |
03b93f08 | 1249 | (*notify_func)(dev, -EINVAL); |
3703987c EA |
1250 | } |
1251 | } | |
1252 | ||
1253 | static void | |
a298bc0b | 1254 | chipset_device_pause(struct visor_device *dev_info) |
3703987c | 1255 | { |
b4b598fd | 1256 | initiate_chipset_device_pause_resume(dev_info, true); |
3703987c EA |
1257 | } |
1258 | ||
1259 | static void | |
a298bc0b | 1260 | chipset_device_resume(struct visor_device *dev_info) |
3703987c | 1261 | { |
b4b598fd | 1262 | initiate_chipset_device_pause_resume(dev_info, false); |
3703987c EA |
1263 | } |
1264 | ||
1265 | struct channel_size_info { | |
1266 | uuid_le guid; | |
1267 | unsigned long min_size; | |
1268 | unsigned long max_size; | |
1269 | }; | |
1270 | ||
55c67dca | 1271 | int |
3703987c EA |
1272 | visorbus_init(void) |
1273 | { | |
78af1aef | 1274 | int err; |
3703987c | 1275 | |
78af1aef | 1276 | POSTCODE_LINUX_3(DRIVER_ENTRY_PC, 0, POSTCODE_SEVERITY_INFO); |
3703987c | 1277 | bus_device_info_init(&clientbus_driverinfo, |
46168810 | 1278 | "clientbus", "visorbus", |
3703987c EA |
1279 | VERSION, NULL); |
1280 | ||
78af1aef DK |
1281 | err = create_bus_type(); |
1282 | if (err < 0) { | |
3703987c | 1283 | POSTCODE_LINUX_2(BUS_CREATE_ENTRY_PC, DIAG_SEVERITY_ERR); |
78af1aef | 1284 | goto error; |
3703987c EA |
1285 | } |
1286 | ||
1287 | periodic_dev_workqueue = create_singlethread_workqueue("visorbus_dev"); | |
1288 | if (!periodic_dev_workqueue) { | |
1289 | POSTCODE_LINUX_2(CREATE_WORKQUEUE_PC, DIAG_SEVERITY_ERR); | |
78af1aef DK |
1290 | err = -ENOMEM; |
1291 | goto error; | |
3703987c EA |
1292 | } |
1293 | ||
1294 | /* This enables us to receive notifications when devices appear for | |
1295 | * which this service partition is to be a server for. | |
1296 | */ | |
4da3336c DK |
1297 | visorchipset_register_busdev(&chipset_notifiers, |
1298 | &chipset_responders, | |
1299 | &chipset_driverinfo); | |
3703987c | 1300 | |
78af1aef | 1301 | return 0; |
3703987c | 1302 | |
78af1aef DK |
1303 | error: |
1304 | POSTCODE_LINUX_3(CHIPSET_INIT_FAILURE_PC, err, POSTCODE_SEVERITY_ERR); | |
1305 | return err; | |
3703987c EA |
1306 | } |
1307 | ||
c79b28f7 | 1308 | void |
3703987c EA |
1309 | visorbus_exit(void) |
1310 | { | |
1311 | struct list_head *listentry, *listtmp; | |
1312 | ||
4da3336c | 1313 | visorchipset_register_busdev(NULL, NULL, NULL); |
3703987c EA |
1314 | remove_all_visor_devices(); |
1315 | ||
1316 | flush_workqueue(periodic_dev_workqueue); /* better not be any work! */ | |
1317 | destroy_workqueue(periodic_dev_workqueue); | |
1318 | periodic_dev_workqueue = NULL; | |
1319 | ||
1320 | if (periodic_test_workqueue) { | |
1321 | cancel_delayed_work(&periodic_work); | |
1322 | flush_workqueue(periodic_test_workqueue); | |
1323 | destroy_workqueue(periodic_test_workqueue); | |
1324 | periodic_test_workqueue = NULL; | |
1325 | } | |
1326 | ||
1327 | list_for_each_safe(listentry, listtmp, &list_all_bus_instances) { | |
343506bf | 1328 | struct visor_device *dev = list_entry(listentry, |
216c3e2c CJ |
1329 | struct visor_device, |
1330 | list_all); | |
343506bf | 1331 | remove_bus_instance(dev); |
3703987c EA |
1332 | } |
1333 | remove_bus_type(); | |
1334 | } | |
1335 | ||
1336 | module_param_named(debug, visorbus_debug, int, S_IRUGO); | |
1337 | MODULE_PARM_DESC(visorbus_debug, "1 to debug"); | |
3703987c EA |
1338 | |
1339 | module_param_named(forcematch, visorbus_forcematch, int, S_IRUGO); | |
1340 | MODULE_PARM_DESC(visorbus_forcematch, | |
1341 | "1 to force a successful dev <--> drv match"); | |
3703987c EA |
1342 | |
1343 | module_param_named(forcenomatch, visorbus_forcenomatch, int, S_IRUGO); | |
1344 | MODULE_PARM_DESC(visorbus_forcenomatch, | |
1345 | "1 to force an UNsuccessful dev <--> drv match"); | |
3703987c | 1346 | |
3703987c EA |
1347 | module_param_named(debugref, visorbus_debugref, int, S_IRUGO); |
1348 | MODULE_PARM_DESC(visorbus_debugref, "1 to debug reference counting"); |