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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 | ||
8217becc | 17 | #include <linux/debugfs.h> |
3703987c EA |
18 | #include <linux/uuid.h> |
19 | ||
4b78000e | 20 | #include "visorbus.h" |
c79b28f7 | 21 | #include "visorbus_private.h" |
0f41c727 | 22 | #include "vmcallinterface.h" |
4b78000e | 23 | |
c79b28f7 PB |
24 | #define MYDRVNAME "visorbus" |
25 | ||
4b78000e | 26 | /* module parameters */ |
f6758e79 DF |
27 | static int visorbus_forcematch; |
28 | static int visorbus_forcenomatch; | |
f4211d1a | 29 | |
38d56c2f EA |
30 | /* Display string that is guaranteed to be no longer the 99 characters*/ |
31 | #define LINESIZE 99 | |
32 | ||
3703987c | 33 | #define CURRENT_FILE_PC VISOR_BUS_PC_visorbus_main_c |
3703987c EA |
34 | #define POLLJIFFIES_NORMALCHANNEL 10 |
35 | ||
6155a3cf | 36 | static int busreg_rc = -ENODEV; /* stores the result from bus registration */ |
8217becc | 37 | static struct dentry *visorbus_debugfs_dir; |
6155a3cf | 38 | |
59fd2c8b PB |
39 | /* |
40 | * DEVICE type attributes | |
41 | * | |
42 | * The modalias file will contain the guid of the device. | |
43 | */ | |
44 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, | |
45 | char *buf) | |
46 | { | |
47 | struct visor_device *vdev; | |
48 | uuid_le guid; | |
49 | ||
50 | vdev = to_visor_device(dev); | |
51 | guid = visorchannel_get_uuid(vdev->visorchannel); | |
7a41385e | 52 | return sprintf(buf, "visorbus:%pUl\n", &guid); |
59fd2c8b PB |
53 | } |
54 | static DEVICE_ATTR_RO(modalias); | |
55 | ||
56 | static struct attribute *visorbus_dev_attrs[] = { | |
57 | &dev_attr_modalias.attr, | |
58 | NULL, | |
59 | }; | |
60 | ||
61 | /* sysfs example for bridge-only sysfs files using device_type's */ | |
62 | static const struct attribute_group visorbus_dev_group = { | |
63 | .attrs = visorbus_dev_attrs, | |
64 | }; | |
65 | ||
cf7281c9 | 66 | static const struct attribute_group *visorbus_dev_groups[] = { |
59fd2c8b PB |
67 | &visorbus_dev_group, |
68 | NULL, | |
69 | }; | |
70 | ||
3703987c EA |
71 | /* filled in with info about parent chipset driver when we register with it */ |
72 | static struct ultra_vbus_deviceinfo chipset_driverinfo; | |
73 | /* filled in with info about this driver, wrt it servicing client busses */ | |
74 | static struct ultra_vbus_deviceinfo clientbus_driverinfo; | |
75 | ||
3fd1b3b6 | 76 | /* list of visor_device structs, linked via .list_all */ |
3703987c | 77 | static LIST_HEAD(list_all_bus_instances); |
3fd1b3b6 | 78 | /* list of visor_device structs, linked via .list_all */ |
3703987c EA |
79 | static LIST_HEAD(list_all_device_instances); |
80 | ||
81 | static int | |
82 | visorbus_uevent(struct device *xdev, struct kobj_uevent_env *env) | |
83 | { | |
59fd2c8b PB |
84 | struct visor_device *dev; |
85 | uuid_le guid; | |
86 | ||
87 | dev = to_visor_device(xdev); | |
88 | guid = visorchannel_get_uuid(dev->visorchannel); | |
89 | ||
90 | if (add_uevent_var(env, "MODALIAS=visorbus:%pUl", &guid)) | |
3703987c EA |
91 | return -ENOMEM; |
92 | return 0; | |
93 | } | |
94 | ||
3fd1b3b6 DB |
95 | /** |
96 | * visorbus_match() - called automatically upon adding a visor_device | |
97 | * (device_add), or adding a visor_driver | |
98 | * (visorbus_register_visor_driver) | |
99 | * @xdev: struct device for the device being matched | |
100 | * @xdrv: struct device_driver for driver to match device against | |
101 | * | |
102 | * Return: 1 iff the provided driver can control the specified device | |
3703987c EA |
103 | */ |
104 | static int | |
105 | visorbus_match(struct device *xdev, struct device_driver *xdrv) | |
106 | { | |
107 | uuid_le channel_type; | |
3703987c EA |
108 | int i; |
109 | struct visor_device *dev; | |
110 | struct visor_driver *drv; | |
111 | ||
112 | dev = to_visor_device(xdev); | |
113 | drv = to_visor_driver(xdrv); | |
114 | channel_type = visorchannel_get_uuid(dev->visorchannel); | |
3703987c | 115 | |
8e33f48c DK |
116 | if (visorbus_forcematch) |
117 | return 1; | |
118 | if (visorbus_forcenomatch) | |
119 | return 0; | |
3703987c | 120 | if (!drv->channel_types) |
8e33f48c DK |
121 | return 0; |
122 | ||
3703987c EA |
123 | for (i = 0; |
124 | (uuid_le_cmp(drv->channel_types[i].guid, NULL_UUID_LE) != 0) || | |
125 | (drv->channel_types[i].name); | |
126 | i++) | |
127 | if (uuid_le_cmp(drv->channel_types[i].guid, | |
8e33f48c DK |
128 | channel_type) == 0) |
129 | return i + 1; | |
130 | ||
131 | return 0; | |
3703987c EA |
132 | } |
133 | ||
7993b40c DK |
134 | /* |
135 | * This describes the TYPE of bus. | |
136 | * (Don't confuse this with an INSTANCE of the bus.) | |
137 | */ | |
138 | struct bus_type visorbus_type = { | |
139 | .name = "visorbus", | |
140 | .match = visorbus_match, | |
141 | .uevent = visorbus_uevent, | |
142 | .dev_groups = visorbus_dev_groups, | |
7993b40c DK |
143 | }; |
144 | ||
3fd1b3b6 | 145 | /** |
ce4617ef DB |
146 | * visorbus_release_busdevice() - called when device_unregister() is called for |
147 | * the bus device instance, after all other tasks | |
148 | * involved with destroying the dev are complete | |
3fd1b3b6 | 149 | * @xdev: struct device for the bus being released |
3703987c EA |
150 | */ |
151 | static void | |
152 | visorbus_release_busdevice(struct device *xdev) | |
153 | { | |
343506bf | 154 | struct visor_device *dev = dev_get_drvdata(xdev); |
3703987c | 155 | |
8217becc TS |
156 | debugfs_remove(dev->debugfs_client_bus_info); |
157 | debugfs_remove_recursive(dev->debugfs_dir); | |
343506bf | 158 | kfree(dev); |
3703987c EA |
159 | } |
160 | ||
3fd1b3b6 DB |
161 | /** |
162 | * visorbus_release_device() - called when device_unregister() is called for | |
163 | * each child device instance | |
164 | * @xdev: struct device for the visor device being released | |
3703987c EA |
165 | */ |
166 | static void | |
167 | visorbus_release_device(struct device *xdev) | |
168 | { | |
169 | struct visor_device *dev = to_visor_device(xdev); | |
170 | ||
3703987c EA |
171 | if (dev->visorchannel) { |
172 | visorchannel_destroy(dev->visorchannel); | |
173 | dev->visorchannel = NULL; | |
174 | } | |
175 | kfree(dev); | |
176 | } | |
177 | ||
3fd1b3b6 DB |
178 | /* |
179 | * begin implementation of specific channel attributes to appear under | |
180 | * /sys/bus/visorbus<x>/dev<y>/channel | |
181 | */ | |
182 | ||
79573162 DZ |
183 | static ssize_t physaddr_show(struct device *dev, struct device_attribute *attr, |
184 | char *buf) | |
826b6a0f | 185 | { |
79573162 DZ |
186 | struct visor_device *vdev = to_visor_device(dev); |
187 | ||
188 | if (!vdev->visorchannel) | |
826b6a0f | 189 | return 0; |
7a41385e DB |
190 | return sprintf(buf, "0x%llx\n", |
191 | visorchannel_get_physaddr(vdev->visorchannel)); | |
826b6a0f | 192 | } |
a25280b3 | 193 | static DEVICE_ATTR_RO(physaddr); |
826b6a0f | 194 | |
79573162 DZ |
195 | static ssize_t nbytes_show(struct device *dev, struct device_attribute *attr, |
196 | char *buf) | |
826b6a0f | 197 | { |
79573162 DZ |
198 | struct visor_device *vdev = to_visor_device(dev); |
199 | ||
200 | if (!vdev->visorchannel) | |
826b6a0f | 201 | return 0; |
7a41385e | 202 | return sprintf(buf, "0x%lx\n", |
79573162 | 203 | visorchannel_get_nbytes(vdev->visorchannel)); |
826b6a0f | 204 | } |
a25280b3 | 205 | static DEVICE_ATTR_RO(nbytes); |
826b6a0f | 206 | |
79573162 DZ |
207 | static ssize_t clientpartition_show(struct device *dev, |
208 | struct device_attribute *attr, char *buf) | |
209 | { | |
210 | struct visor_device *vdev = to_visor_device(dev); | |
211 | ||
212 | if (!vdev->visorchannel) | |
826b6a0f | 213 | return 0; |
7a41385e DB |
214 | return sprintf(buf, "0x%llx\n", |
215 | visorchannel_get_clientpartition(vdev->visorchannel)); | |
826b6a0f | 216 | } |
a25280b3 | 217 | static DEVICE_ATTR_RO(clientpartition); |
826b6a0f | 218 | |
79573162 DZ |
219 | static ssize_t typeguid_show(struct device *dev, struct device_attribute *attr, |
220 | char *buf) | |
826b6a0f | 221 | { |
79573162 | 222 | struct visor_device *vdev = to_visor_device(dev); |
38d56c2f | 223 | char typeid[LINESIZE]; |
826b6a0f | 224 | |
79573162 | 225 | if (!vdev->visorchannel) |
826b6a0f | 226 | return 0; |
7a41385e DB |
227 | return sprintf(buf, "%s\n", |
228 | visorchannel_id(vdev->visorchannel, typeid)); | |
826b6a0f | 229 | } |
a25280b3 | 230 | static DEVICE_ATTR_RO(typeguid); |
826b6a0f | 231 | |
79573162 DZ |
232 | static ssize_t zoneguid_show(struct device *dev, struct device_attribute *attr, |
233 | char *buf) | |
826b6a0f | 234 | { |
79573162 | 235 | struct visor_device *vdev = to_visor_device(dev); |
38d56c2f | 236 | char zoneid[LINESIZE]; |
826b6a0f | 237 | |
79573162 | 238 | if (!vdev->visorchannel) |
826b6a0f | 239 | return 0; |
7a41385e DB |
240 | return sprintf(buf, "%s\n", |
241 | visorchannel_zoneid(vdev->visorchannel, zoneid)); | |
826b6a0f | 242 | } |
a25280b3 | 243 | static DEVICE_ATTR_RO(zoneguid); |
826b6a0f | 244 | |
79573162 DZ |
245 | static ssize_t typename_show(struct device *dev, struct device_attribute *attr, |
246 | char *buf) | |
826b6a0f | 247 | { |
79573162 | 248 | struct visor_device *vdev = to_visor_device(dev); |
826b6a0f | 249 | int i = 0; |
79573162 DZ |
250 | struct bus_type *xbus = dev->bus; |
251 | struct device_driver *xdrv = dev->driver; | |
826b6a0f PB |
252 | struct visor_driver *drv = NULL; |
253 | ||
79573162 | 254 | if (!vdev->visorchannel || !xbus || !xdrv) |
826b6a0f | 255 | return 0; |
79573162 | 256 | i = xbus->match(dev, xdrv); |
826b6a0f PB |
257 | if (!i) |
258 | return 0; | |
259 | drv = to_visor_driver(xdrv); | |
7a41385e | 260 | return sprintf(buf, "%s\n", drv->channel_types[i - 1].name); |
826b6a0f | 261 | } |
79573162 | 262 | static DEVICE_ATTR_RO(typename); |
79573162 DZ |
263 | |
264 | static struct attribute *channel_attrs[] = { | |
265 | &dev_attr_physaddr.attr, | |
266 | &dev_attr_nbytes.attr, | |
267 | &dev_attr_clientpartition.attr, | |
268 | &dev_attr_typeguid.attr, | |
269 | &dev_attr_zoneguid.attr, | |
270 | &dev_attr_typename.attr, | |
fd012d0d | 271 | NULL |
826b6a0f PB |
272 | }; |
273 | ||
79573162 DZ |
274 | static struct attribute_group channel_attr_grp = { |
275 | .name = "channel", | |
276 | .attrs = channel_attrs, | |
826b6a0f PB |
277 | }; |
278 | ||
59fd2c8b | 279 | static const struct attribute_group *visorbus_channel_groups[] = { |
79573162 DZ |
280 | &channel_attr_grp, |
281 | NULL | |
826b6a0f PB |
282 | }; |
283 | ||
79573162 | 284 | /* end implementation of specific channel attributes */ |
826b6a0f | 285 | |
3fd1b3b6 DB |
286 | /* |
287 | * BUS instance attributes | |
3703987c EA |
288 | * |
289 | * define & implement display of bus attributes under | |
3fd1b3b6 | 290 | * /sys/bus/visorbus/devices/visorbus<n>. |
3703987c EA |
291 | */ |
292 | ||
d181dd03 DZ |
293 | static ssize_t partition_handle_show(struct device *dev, |
294 | struct device_attribute *attr, | |
295 | char *buf) { | |
5ecbd5d4 DZ |
296 | struct visor_device *vdev = to_visor_device(dev); |
297 | u64 handle = visorchannel_get_clientpartition(vdev->visorchannel); | |
3703987c | 298 | |
7a41385e | 299 | return sprintf(buf, "0x%llx\n", handle); |
3703987c | 300 | } |
a25280b3 | 301 | static DEVICE_ATTR_RO(partition_handle); |
3703987c | 302 | |
d181dd03 DZ |
303 | static ssize_t partition_guid_show(struct device *dev, |
304 | struct device_attribute *attr, | |
305 | char *buf) { | |
5ecbd5d4 | 306 | struct visor_device *vdev = to_visor_device(dev); |
3703987c | 307 | |
7a41385e | 308 | return sprintf(buf, "{%pUb}\n", &vdev->partition_uuid); |
3703987c | 309 | } |
a25280b3 | 310 | static DEVICE_ATTR_RO(partition_guid); |
3703987c | 311 | |
d181dd03 DZ |
312 | static ssize_t partition_name_show(struct device *dev, |
313 | struct device_attribute *attr, | |
314 | char *buf) { | |
5ecbd5d4 | 315 | struct visor_device *vdev = to_visor_device(dev); |
3703987c | 316 | |
7a41385e | 317 | return sprintf(buf, "%s\n", vdev->name); |
3703987c | 318 | } |
a25280b3 | 319 | static DEVICE_ATTR_RO(partition_name); |
3703987c | 320 | |
d181dd03 DZ |
321 | static ssize_t channel_addr_show(struct device *dev, |
322 | struct device_attribute *attr, | |
323 | char *buf) { | |
5ecbd5d4 DZ |
324 | struct visor_device *vdev = to_visor_device(dev); |
325 | u64 addr = visorchannel_get_physaddr(vdev->visorchannel); | |
3703987c | 326 | |
7a41385e | 327 | return sprintf(buf, "0x%llx\n", addr); |
3703987c | 328 | } |
a25280b3 | 329 | static DEVICE_ATTR_RO(channel_addr); |
3703987c | 330 | |
d181dd03 DZ |
331 | static ssize_t channel_bytes_show(struct device *dev, |
332 | struct device_attribute *attr, | |
333 | char *buf) { | |
5ecbd5d4 DZ |
334 | struct visor_device *vdev = to_visor_device(dev); |
335 | u64 nbytes = visorchannel_get_nbytes(vdev->visorchannel); | |
3703987c | 336 | |
7a41385e | 337 | return sprintf(buf, "0x%llx\n", nbytes); |
3703987c | 338 | } |
a25280b3 | 339 | static DEVICE_ATTR_RO(channel_bytes); |
3703987c | 340 | |
d181dd03 DZ |
341 | static ssize_t channel_id_show(struct device *dev, |
342 | struct device_attribute *attr, | |
343 | char *buf) { | |
5ecbd5d4 | 344 | struct visor_device *vdev = to_visor_device(dev); |
3703987c EA |
345 | int len = 0; |
346 | ||
5ecbd5d4 DZ |
347 | if (vdev->visorchannel) { |
348 | visorchannel_id(vdev->visorchannel, buf); | |
3703987c EA |
349 | len = strlen(buf); |
350 | buf[len++] = '\n'; | |
351 | } | |
352 | return len; | |
353 | } | |
a25280b3 | 354 | static DEVICE_ATTR_RO(channel_id); |
3703987c | 355 | |
d181dd03 DZ |
356 | static struct attribute *dev_attrs[] = { |
357 | &dev_attr_partition_handle.attr, | |
358 | &dev_attr_partition_guid.attr, | |
359 | &dev_attr_partition_name.attr, | |
360 | &dev_attr_channel_addr.attr, | |
361 | &dev_attr_channel_bytes.attr, | |
362 | &dev_attr_channel_id.attr, | |
d181dd03 DZ |
363 | NULL |
364 | }; | |
3703987c | 365 | |
d181dd03 DZ |
366 | static struct attribute_group dev_attr_grp = { |
367 | .attrs = dev_attrs, | |
368 | }; | |
3703987c | 369 | |
d181dd03 DZ |
370 | static const struct attribute_group *visorbus_groups[] = { |
371 | &dev_attr_grp, | |
372 | NULL | |
373 | }; | |
3703987c | 374 | |
8217becc TS |
375 | /* |
376 | * BUS debugfs entries | |
377 | * | |
378 | * define & implement display of debugfs attributes under | |
379 | * /sys/kernel/debug/visorbus/visorbus<n>. | |
380 | */ | |
381 | ||
382 | static int client_bus_info_debugfs_show(struct seq_file *seq, void *v) | |
383 | { | |
384 | struct visor_device *vdev = seq->private; | |
385 | struct visorchannel *channel = vdev->visorchannel; | |
386 | ||
387 | int i; | |
388 | unsigned long off; | |
389 | struct ultra_vbus_deviceinfo dev_info; | |
390 | ||
391 | if (!channel) | |
392 | return 0; | |
393 | ||
394 | seq_printf(seq, | |
395 | "Client device / client driver info for %s partition (vbus #%u):\n", | |
396 | ((vdev->name) ? (char *)(vdev->name) : ""), | |
397 | vdev->chipset_bus_no); | |
398 | if (visorchannel_read(channel, | |
399 | offsetof(struct spar_vbus_channel_protocol, | |
400 | chp_info), | |
401 | &dev_info, sizeof(dev_info)) >= 0) | |
402 | vbuschannel_print_devinfo(&dev_info, seq, -1); | |
403 | if (visorchannel_read(channel, | |
404 | offsetof(struct spar_vbus_channel_protocol, | |
405 | bus_info), | |
406 | &dev_info, sizeof(dev_info)) >= 0) | |
407 | vbuschannel_print_devinfo(&dev_info, seq, -1); | |
408 | off = offsetof(struct spar_vbus_channel_protocol, dev_info); | |
409 | i = 0; | |
410 | while (off + sizeof(dev_info) <= visorchannel_get_nbytes(channel)) { | |
411 | if (visorchannel_read(channel, off, &dev_info, | |
412 | sizeof(dev_info)) >= 0) | |
413 | vbuschannel_print_devinfo(&dev_info, seq, i); | |
414 | off += sizeof(dev_info); | |
415 | i++; | |
416 | } | |
417 | ||
418 | return 0; | |
419 | } | |
420 | ||
421 | static int client_bus_info_debugfs_open(struct inode *inode, struct file *file) | |
422 | { | |
423 | return single_open(file, client_bus_info_debugfs_show, | |
424 | inode->i_private); | |
425 | } | |
426 | ||
427 | static const struct file_operations client_bus_info_debugfs_fops = { | |
428 | .owner = THIS_MODULE, | |
429 | .open = client_bus_info_debugfs_open, | |
430 | .read = seq_read, | |
431 | .llseek = seq_lseek, | |
432 | .release = single_release, | |
433 | }; | |
434 | ||
3703987c | 435 | static void |
9ebab649 | 436 | dev_periodic_work(unsigned long __opaque) |
3703987c | 437 | { |
9ebab649 | 438 | struct visor_device *dev = (struct visor_device *)__opaque; |
3703987c EA |
439 | struct visor_driver *drv = to_visor_driver(dev->device.driver); |
440 | ||
396e36c9 | 441 | drv->channel_interrupt(dev); |
9ebab649 | 442 | mod_timer(&dev->timer, jiffies + POLLJIFFIES_NORMALCHANNEL); |
3703987c EA |
443 | } |
444 | ||
445 | static void | |
446 | dev_start_periodic_work(struct visor_device *dev) | |
447 | { | |
9ebab649 | 448 | if (dev->being_removed || dev->timer_active) |
3703987c EA |
449 | return; |
450 | /* now up by at least 2 */ | |
451 | get_device(&dev->device); | |
9ebab649 TS |
452 | dev->timer.expires = jiffies + POLLJIFFIES_NORMALCHANNEL; |
453 | add_timer(&dev->timer); | |
454 | dev->timer_active = true; | |
3703987c EA |
455 | } |
456 | ||
457 | static void | |
458 | dev_stop_periodic_work(struct visor_device *dev) | |
459 | { | |
9ebab649 TS |
460 | if (!dev->timer_active) |
461 | return; | |
462 | del_timer_sync(&dev->timer); | |
463 | dev->timer_active = false; | |
464 | put_device(&dev->device); | |
3703987c EA |
465 | } |
466 | ||
3fd1b3b6 DB |
467 | /** |
468 | * visordriver_remove_device() - handle visor device going away | |
469 | * @xdev: struct device for the visor device being removed | |
470 | * | |
471 | * This is called when device_unregister() is called for each child device | |
472 | * instance, to notify the appropriate visorbus function driver that the device | |
473 | * is going away, and to decrease the reference count of the device. | |
474 | * | |
475 | * Return: 0 iff successful | |
3703987c EA |
476 | */ |
477 | static int | |
478 | visordriver_remove_device(struct device *xdev) | |
479 | { | |
3703987c EA |
480 | struct visor_device *dev; |
481 | struct visor_driver *drv; | |
482 | ||
483 | dev = to_visor_device(xdev); | |
484 | drv = to_visor_driver(xdev->driver); | |
d505855e | 485 | mutex_lock(&dev->visordriver_callback_lock); |
779d0752 | 486 | dev->being_removed = true; |
64938182 DK |
487 | if (drv->remove) |
488 | drv->remove(dev); | |
d505855e | 489 | mutex_unlock(&dev->visordriver_callback_lock); |
3703987c | 490 | dev_stop_periodic_work(dev); |
3703987c EA |
491 | |
492 | put_device(&dev->device); | |
df7f46e8 | 493 | return 0; |
3703987c EA |
494 | } |
495 | ||
3fd1b3b6 DB |
496 | /** |
497 | * visorbus_unregister_visor_driver() - unregisters the provided driver | |
498 | * @drv: the driver to unregister | |
499 | * | |
500 | * A visor function driver calls this function to unregister the driver, | |
501 | * i.e., within its module_exit function. | |
3703987c EA |
502 | */ |
503 | void | |
504 | visorbus_unregister_visor_driver(struct visor_driver *drv) | |
505 | { | |
3703987c EA |
506 | driver_unregister(&drv->driver); |
507 | } | |
508 | EXPORT_SYMBOL_GPL(visorbus_unregister_visor_driver); | |
509 | ||
3fd1b3b6 DB |
510 | /** |
511 | * visorbus_read_channel() - reads from the designated channel into | |
512 | * the provided buffer | |
513 | * @dev: the device whose channel is read from | |
514 | * @offset: the offset into the channel at which reading starts | |
515 | * @dest: the destination buffer that is written into from the channel | |
516 | * @nbytes: the number of bytes to read from the channel | |
517 | * | |
518 | * If receiving a message, use the visorchannel_signalremove() | |
519 | * function instead. | |
520 | * | |
521 | * Return: integer indicating success (zero) or failure (non-zero) | |
522 | */ | |
3703987c EA |
523 | int |
524 | visorbus_read_channel(struct visor_device *dev, unsigned long offset, | |
525 | void *dest, unsigned long nbytes) | |
526 | { | |
527 | return visorchannel_read(dev->visorchannel, offset, dest, nbytes); | |
528 | } | |
529 | EXPORT_SYMBOL_GPL(visorbus_read_channel); | |
530 | ||
3fd1b3b6 DB |
531 | /** |
532 | * visorbus_write_channel() - writes the provided buffer into the designated | |
533 | * channel | |
534 | * @dev: the device whose channel is written to | |
535 | * @offset: the offset into the channel at which writing starts | |
536 | * @src: the source buffer that is written into the channel | |
537 | * @nbytes: the number of bytes to write into the channel | |
538 | * | |
539 | * If sending a message, use the visorchannel_signalinsert() | |
540 | * function instead. | |
541 | * | |
542 | * Return: integer indicating success (zero) or failure (non-zero) | |
543 | */ | |
3703987c EA |
544 | int |
545 | visorbus_write_channel(struct visor_device *dev, unsigned long offset, | |
546 | void *src, unsigned long nbytes) | |
547 | { | |
548 | return visorchannel_write(dev->visorchannel, offset, src, nbytes); | |
549 | } | |
550 | EXPORT_SYMBOL_GPL(visorbus_write_channel); | |
551 | ||
3fd1b3b6 DB |
552 | /** |
553 | * visorbus_enable_channel_interrupts() - enables interrupts on the | |
554 | * designated device | |
555 | * @dev: the device on which to enable interrupts | |
556 | * | |
557 | * Currently we don't yet have a real interrupt, so for now we just call the | |
558 | * interrupt function periodically via a timer. | |
3703987c EA |
559 | */ |
560 | void | |
561 | visorbus_enable_channel_interrupts(struct visor_device *dev) | |
562 | { | |
396e36c9 TS |
563 | struct visor_driver *drv = to_visor_driver(dev->device.driver); |
564 | ||
565 | if (!drv->channel_interrupt) { | |
566 | dev_err(&dev->device, "%s no interrupt function!\n", __func__); | |
567 | return; | |
568 | } | |
569 | ||
3703987c EA |
570 | dev_start_periodic_work(dev); |
571 | } | |
572 | EXPORT_SYMBOL_GPL(visorbus_enable_channel_interrupts); | |
573 | ||
3fd1b3b6 DB |
574 | /** |
575 | * visorbus_disable_channel_interrupts() - disables interrupts on the | |
576 | * designated device | |
577 | * @dev: the device on which to disable interrupts | |
578 | */ | |
3703987c EA |
579 | void |
580 | visorbus_disable_channel_interrupts(struct visor_device *dev) | |
581 | { | |
582 | dev_stop_periodic_work(dev); | |
583 | } | |
584 | EXPORT_SYMBOL_GPL(visorbus_disable_channel_interrupts); | |
585 | ||
3fd1b3b6 DB |
586 | /** |
587 | * create_visor_device() - create visor device as a result of receiving the | |
588 | * controlvm device_create message for a new device | |
589 | * @dev: a freshly-zeroed struct visor_device, containing only filled-in values | |
590 | * for chipset_bus_no and chipset_dev_no, that will be initialized | |
591 | * | |
592 | * This is how everything starts from the device end. | |
593 | * This function is called when a channel first appears via a ControlVM | |
594 | * message. In response, this function allocates a visor_device to | |
595 | * correspond to the new channel, and attempts to connect it the appropriate | |
596 | * driver. If the appropriate driver is found, the visor_driver.probe() | |
597 | * function for that driver will be called, and will be passed the new | |
598 | * visor_device that we just created. | |
3703987c | 599 | * |
3fd1b3b6 DB |
600 | * It's ok if the appropriate driver is not yet loaded, because in that case |
601 | * the new device struct will just stick around in the bus' list of devices. | |
602 | * When the appropriate driver calls visorbus_register_visor_driver(), the | |
603 | * visor_driver.probe() for the new driver will be called with the new | |
604 | * device. | |
605 | * | |
606 | * Return: 0 if successful, otherwise the negative value returned by | |
607 | * device_add() indicating the reason for failure | |
3703987c EA |
608 | */ |
609 | static int | |
a298bc0b | 610 | create_visor_device(struct visor_device *dev) |
3703987c | 611 | { |
0b2acf34 | 612 | int err; |
a298bc0b DZ |
613 | u32 chipset_bus_no = dev->chipset_bus_no; |
614 | u32 chipset_dev_no = dev->chipset_dev_no; | |
3703987c | 615 | |
f30c2c35 | 616 | POSTCODE_LINUX(DEVICE_CREATE_ENTRY_PC, chipset_dev_no, chipset_bus_no, |
c6bc82f1 | 617 | DIAG_SEVERITY_PRINT); |
3703987c | 618 | |
d505855e | 619 | mutex_init(&dev->visordriver_callback_lock); |
3703987c | 620 | dev->device.bus = &visorbus_type; |
59fd2c8b | 621 | dev->device.groups = visorbus_channel_groups; |
3703987c EA |
622 | device_initialize(&dev->device); |
623 | dev->device.release = visorbus_release_device; | |
624 | /* keep a reference just for us (now 2) */ | |
625 | get_device(&dev->device); | |
614dd644 | 626 | setup_timer(&dev->timer, dev_periodic_work, (unsigned long)dev); |
3703987c | 627 | |
3fd1b3b6 DB |
628 | /* |
629 | * bus_id must be a unique name with respect to this bus TYPE | |
3703987c EA |
630 | * (NOT bus instance). That's why we need to include the bus |
631 | * number within the name. | |
632 | */ | |
b4b598fd | 633 | dev_set_name(&dev->device, "vbus%u:dev%u", |
3703987c EA |
634 | chipset_bus_no, chipset_dev_no); |
635 | ||
3fd1b3b6 DB |
636 | /* |
637 | * device_add does this: | |
3703987c EA |
638 | * bus_add_device(dev) |
639 | * ->device_attach(dev) | |
640 | * ->for each driver drv registered on the bus that dev is on | |
641 | * if (dev.drv) ** device already has a driver ** | |
642 | * ** not sure we could ever get here... ** | |
643 | * else | |
644 | * if (bus.match(dev,drv)) [visorbus_match] | |
645 | * dev.drv = drv | |
646 | * if (!drv.probe(dev)) [visordriver_probe_device] | |
647 | * dev.drv = NULL | |
648 | * | |
649 | * Note that device_add does NOT fail if no driver failed to | |
650 | * claim the device. The device will be linked onto | |
651 | * bus_type.klist_devices regardless (use bus_for_each_dev). | |
652 | */ | |
0b2acf34 DK |
653 | err = device_add(&dev->device); |
654 | if (err < 0) { | |
6daa8205 BT |
655 | POSTCODE_LINUX(DEVICE_ADD_PC, 0, chipset_bus_no, |
656 | DIAG_SEVERITY_ERR); | |
0b2acf34 | 657 | goto err_put; |
3703987c EA |
658 | } |
659 | ||
a298bc0b | 660 | list_add_tail(&dev->list_all, &list_all_device_instances); |
0b2acf34 | 661 | return 0; /* success: reference kept via unmatched get_device() */ |
3703987c | 662 | |
0b2acf34 | 663 | err_put: |
a298bc0b | 664 | put_device(&dev->device); |
0b2acf34 | 665 | return err; |
3703987c EA |
666 | } |
667 | ||
668 | static void | |
669 | remove_visor_device(struct visor_device *dev) | |
670 | { | |
671 | list_del(&dev->list_all); | |
3703987c EA |
672 | put_device(&dev->device); |
673 | device_unregister(&dev->device); | |
674 | } | |
675 | ||
3703987c EA |
676 | static int |
677 | get_vbus_header_info(struct visorchannel *chan, | |
678 | struct spar_vbus_headerinfo *hdr_info) | |
679 | { | |
3703987c | 680 | if (!SPAR_VBUS_CHANNEL_OK_CLIENT(visorchannel_get_header(chan))) |
f748f64f BR |
681 | return -EINVAL; |
682 | ||
3703987c EA |
683 | if (visorchannel_read(chan, sizeof(struct channel_header), hdr_info, |
684 | sizeof(*hdr_info)) < 0) { | |
f748f64f | 685 | return -EIO; |
3703987c EA |
686 | } |
687 | if (hdr_info->struct_bytes < sizeof(struct spar_vbus_headerinfo)) | |
f748f64f BR |
688 | return -EINVAL; |
689 | ||
3703987c EA |
690 | if (hdr_info->device_info_struct_bytes < |
691 | sizeof(struct ultra_vbus_deviceinfo)) { | |
f748f64f | 692 | return -EINVAL; |
3703987c | 693 | } |
f748f64f | 694 | return 0; |
3703987c EA |
695 | } |
696 | ||
3fd1b3b6 DB |
697 | /** |
698 | * write_vbus_chp_info() - write the contents of <info> to the struct | |
699 | * spar_vbus_channel_protocol.chp_info | |
700 | * @chan: indentifies the s-Par channel that will be updated | |
701 | * @hdr_info: used to find appropriate channel offset to write data | |
702 | * @info: contains the information to write | |
703 | * | |
704 | * Writes chipset info into the channel memory to be used for diagnostic | |
705 | * purposes. | |
ff13cf37 | 706 | * |
3fd1b3b6 | 707 | * Returns no value since this is debug information and not needed for |
ff13cf37 | 708 | * device functionality. |
48117895 | 709 | */ |
ff13cf37 | 710 | static void |
3703987c EA |
711 | write_vbus_chp_info(struct visorchannel *chan, |
712 | struct spar_vbus_headerinfo *hdr_info, | |
713 | struct ultra_vbus_deviceinfo *info) | |
714 | { | |
715 | int off = sizeof(struct channel_header) + hdr_info->chp_info_offset; | |
716 | ||
717 | if (hdr_info->chp_info_offset == 0) | |
ff13cf37 | 718 | return; |
3703987c | 719 | |
ff13cf37 | 720 | visorchannel_write(chan, off, info, sizeof(*info)); |
3703987c EA |
721 | } |
722 | ||
3fd1b3b6 DB |
723 | /** |
724 | * write_vbus_bus_info() - write the contents of <info> to the struct | |
725 | * spar_vbus_channel_protocol.bus_info | |
726 | * @chan: indentifies the s-Par channel that will be updated | |
727 | * @hdr_info: used to find appropriate channel offset to write data | |
728 | * @info: contains the information to write | |
729 | * | |
730 | * Writes bus info into the channel memory to be used for diagnostic | |
731 | * purposes. | |
ff13cf37 | 732 | * |
3fd1b3b6 | 733 | * Returns no value since this is debug information and not needed for |
ff13cf37 | 734 | * device functionality. |
48117895 | 735 | */ |
ff13cf37 | 736 | static void |
3703987c EA |
737 | write_vbus_bus_info(struct visorchannel *chan, |
738 | struct spar_vbus_headerinfo *hdr_info, | |
739 | struct ultra_vbus_deviceinfo *info) | |
740 | { | |
741 | int off = sizeof(struct channel_header) + hdr_info->bus_info_offset; | |
742 | ||
743 | if (hdr_info->bus_info_offset == 0) | |
ff13cf37 | 744 | return; |
3703987c | 745 | |
ff13cf37 | 746 | visorchannel_write(chan, off, info, sizeof(*info)); |
3703987c EA |
747 | } |
748 | ||
3fd1b3b6 DB |
749 | /** |
750 | * write_vbus_dev_info() - write the contents of <info> to the struct | |
751 | * spar_vbus_channel_protocol.dev_info[<devix>] | |
752 | * @chan: indentifies the s-Par channel that will be updated | |
753 | * @hdr_info: used to find appropriate channel offset to write data | |
754 | * @info: contains the information to write | |
755 | * @devix: the relative device number (0..n-1) of the device on the bus | |
ff13cf37 | 756 | * |
3fd1b3b6 DB |
757 | * Writes device info into the channel memory to be used for diagnostic |
758 | * purposes. | |
759 | * | |
760 | * Returns no value since this is debug information and not needed for | |
ff13cf37 | 761 | * device functionality. |
3703987c | 762 | */ |
ff13cf37 | 763 | static void |
3703987c EA |
764 | write_vbus_dev_info(struct visorchannel *chan, |
765 | struct spar_vbus_headerinfo *hdr_info, | |
f7a34ff7 | 766 | struct ultra_vbus_deviceinfo *info, unsigned int devix) |
3703987c EA |
767 | { |
768 | int off = | |
769 | (sizeof(struct channel_header) + hdr_info->dev_info_offset) + | |
770 | (hdr_info->device_info_struct_bytes * devix); | |
771 | ||
772 | if (hdr_info->dev_info_offset == 0) | |
ff13cf37 | 773 | return; |
3703987c | 774 | |
ff13cf37 | 775 | visorchannel_write(chan, off, info, sizeof(*info)); |
3703987c EA |
776 | } |
777 | ||
3fd1b3b6 DB |
778 | /** |
779 | * fix_vbus_dev_info() - for a child device just created on a client bus, fill | |
780 | * in information about the driver that is controlling | |
781 | * this device into the the appropriate slot within the | |
782 | * vbus channel of the bus instance | |
783 | * @visordev: struct visor_device for the desired device | |
3703987c EA |
784 | */ |
785 | static void | |
786 | fix_vbus_dev_info(struct visor_device *visordev) | |
787 | { | |
788 | int i; | |
d32517e3 | 789 | struct visor_device *bdev; |
3703987c | 790 | struct visor_driver *visordrv; |
f7a34ff7 TS |
791 | u32 bus_no = visordev->chipset_bus_no; |
792 | u32 dev_no = visordev->chipset_dev_no; | |
3703987c EA |
793 | struct ultra_vbus_deviceinfo dev_info; |
794 | const char *chan_type_name = NULL; | |
7726f813 | 795 | struct spar_vbus_headerinfo *hdr_info; |
3703987c EA |
796 | |
797 | if (!visordev->device.driver) | |
216c3e2c | 798 | return; |
3703987c | 799 | |
d32517e3 DZ |
800 | bdev = visorbus_get_device_by_id(bus_no, BUS_ROOT_DEVICE, NULL); |
801 | if (!bdev) | |
802 | return; | |
5990b39e TS |
803 | hdr_info = (struct spar_vbus_headerinfo *)bdev->vbus_hdr_info; |
804 | if (!hdr_info) | |
805 | return; | |
d32517e3 | 806 | visordrv = to_visor_driver(visordev->device.driver); |
3703987c | 807 | |
3fd1b3b6 DB |
808 | /* |
809 | * Within the list of device types (by GUID) that the driver | |
3703987c EA |
810 | * says it supports, find out which one of those types matches |
811 | * the type of this device, so that we can include the device | |
812 | * type name | |
813 | */ | |
814 | for (i = 0; visordrv->channel_types[i].name; i++) { | |
d5b3f1dc EA |
815 | if (memcmp(&visordrv->channel_types[i].guid, |
816 | &visordev->channel_type_guid, | |
817 | sizeof(visordrv->channel_types[i].guid)) == 0) { | |
3703987c EA |
818 | chan_type_name = visordrv->channel_types[i].name; |
819 | break; | |
820 | } | |
821 | } | |
822 | ||
e82ed633 | 823 | bus_device_info_init(&dev_info, chan_type_name, visordrv->name); |
d32517e3 | 824 | write_vbus_dev_info(bdev->visorchannel, hdr_info, &dev_info, dev_no); |
3703987c | 825 | |
3fd1b3b6 DB |
826 | /* |
827 | * Re-write bus+chipset info, because it is possible that this | |
828 | * was previously written by our evil counterpart, virtpci. | |
829 | */ | |
d32517e3 DZ |
830 | write_vbus_chp_info(bdev->visorchannel, hdr_info, &chipset_driverinfo); |
831 | write_vbus_bus_info(bdev->visorchannel, hdr_info, | |
832 | &clientbus_driverinfo); | |
3703987c EA |
833 | } |
834 | ||
7a0ee694 DK |
835 | /** |
836 | * visordriver_probe_device() - handle new visor device coming online | |
837 | * @xdev: struct device for the visor device being probed | |
838 | * | |
839 | * This is called automatically upon adding a visor_device (device_add), or | |
840 | * adding a visor_driver (visorbus_register_visor_driver), but only after | |
841 | * visorbus_match() has returned 1 to indicate a successful match between | |
842 | * driver and device. | |
843 | * | |
844 | * If successful, a reference to the device will be held onto via get_device(). | |
845 | * | |
846 | * Return: 0 if successful, meaning the function driver's probe() function | |
847 | * was successful with this device, otherwise a negative errno | |
848 | * value indicating failure reason | |
849 | */ | |
850 | static int | |
851 | visordriver_probe_device(struct device *xdev) | |
852 | { | |
853 | int res; | |
854 | struct visor_driver *drv; | |
855 | struct visor_device *dev; | |
856 | ||
857 | drv = to_visor_driver(xdev->driver); | |
858 | dev = to_visor_device(xdev); | |
859 | ||
860 | if (!drv->probe) | |
861 | return -ENODEV; | |
862 | ||
863 | mutex_lock(&dev->visordriver_callback_lock); | |
864 | dev->being_removed = false; | |
865 | ||
866 | res = drv->probe(dev); | |
867 | if (res >= 0) { | |
868 | /* success: reference kept via unmatched get_device() */ | |
869 | get_device(&dev->device); | |
870 | fix_vbus_dev_info(dev); | |
871 | } | |
872 | ||
873 | mutex_unlock(&dev->visordriver_callback_lock); | |
874 | return res; | |
875 | } | |
876 | ||
877 | /** | |
878 | * visorbus_register_visor_driver() - registers the provided visor driver | |
879 | * for handling one or more visor device | |
880 | * types (channel_types) | |
881 | * @drv: the driver to register | |
882 | * | |
883 | * A visor function driver calls this function to register | |
884 | * the driver. The caller MUST fill in the following fields within the | |
885 | * #drv structure: | |
886 | * name, version, owner, channel_types, probe, remove | |
887 | * | |
888 | * Here's how the whole Linux bus / driver / device model works. | |
889 | * | |
890 | * At system start-up, the visorbus kernel module is loaded, which registers | |
891 | * visorbus_type as a bus type, using bus_register(). | |
892 | * | |
893 | * All kernel modules that support particular device types on a | |
894 | * visorbus bus are loaded. Each of these kernel modules calls | |
895 | * visorbus_register_visor_driver() in their init functions, passing a | |
896 | * visor_driver struct. visorbus_register_visor_driver() in turn calls | |
897 | * register_driver(&visor_driver.driver). This .driver member is | |
898 | * initialized with generic methods (like probe), whose sole responsibility | |
899 | * is to act as a broker for the real methods, which are within the | |
900 | * visor_driver struct. (This is the way the subclass behavior is | |
901 | * implemented, since visor_driver is essentially a subclass of the | |
902 | * generic driver.) Whenever a driver_register() happens, core bus code in | |
903 | * the kernel does (see device_attach() in drivers/base/dd.c): | |
904 | * | |
905 | * for each dev associated with the bus (the bus that driver is on) that | |
906 | * does not yet have a driver | |
907 | * if bus.match(dev,newdriver) == yes_matched ** .match specified | |
908 | * ** during bus_register(). | |
909 | * newdriver.probe(dev) ** for visor drivers, this will call | |
910 | * ** the generic driver.probe implemented in visorbus.c, | |
911 | * ** which in turn calls the probe specified within the | |
912 | * ** struct visor_driver (which was specified by the | |
913 | * ** actual device driver as part of | |
914 | * ** visorbus_register_visor_driver()). | |
915 | * | |
916 | * The above dance also happens when a new device appears. | |
917 | * So the question is, how are devices created within the system? | |
918 | * Basically, just call device_add(dev). See pci_bus_add_devices(). | |
919 | * pci_scan_device() shows an example of how to build a device struct. It | |
920 | * returns the newly-created struct to pci_scan_single_device(), who adds it | |
921 | * to the list of devices at PCIBUS.devices. That list of devices is what | |
922 | * is traversed by pci_bus_add_devices(). | |
923 | * | |
924 | * Return: integer indicating success (zero) or failure (non-zero) | |
925 | */ | |
926 | int visorbus_register_visor_driver(struct visor_driver *drv) | |
927 | { | |
928 | int rc = 0; | |
929 | ||
930 | if (busreg_rc < 0) | |
931 | return -ENODEV; /*can't register on a nonexistent bus*/ | |
932 | ||
933 | drv->driver.name = drv->name; | |
934 | drv->driver.bus = &visorbus_type; | |
935 | drv->driver.probe = visordriver_probe_device; | |
936 | drv->driver.remove = visordriver_remove_device; | |
937 | drv->driver.owner = drv->owner; | |
938 | ||
939 | /* | |
940 | * driver_register does this: | |
941 | * bus_add_driver(drv) | |
942 | * ->if (drv.bus) ** (bus_type) ** | |
943 | * driver_attach(drv) | |
944 | * for each dev with bus type of drv.bus | |
945 | * if (!dev.drv) ** no driver assigned yet ** | |
946 | * if (bus.match(dev,drv)) [visorbus_match] | |
947 | * dev.drv = drv | |
948 | * if (!drv.probe(dev)) [visordriver_probe_device] | |
949 | * dev.drv = NULL | |
950 | */ | |
951 | ||
952 | rc = driver_register(&drv->driver); | |
7a0ee694 DK |
953 | if (rc < 0) |
954 | driver_unregister(&drv->driver); | |
955 | return rc; | |
956 | } | |
957 | EXPORT_SYMBOL_GPL(visorbus_register_visor_driver); | |
958 | ||
3fd1b3b6 DB |
959 | /** |
960 | * create_bus_instance() - create a device instance for the visor bus itself | |
961 | * @dev: struct visor_device indicating the bus instance | |
962 | * | |
963 | * Return: 0 for success, otherwise negative errno value indicating reason for | |
964 | * failure | |
3703987c | 965 | */ |
d32517e3 DZ |
966 | static int |
967 | create_bus_instance(struct visor_device *dev) | |
3703987c | 968 | { |
d32517e3 | 969 | int id = dev->chipset_bus_no; |
8217becc | 970 | int err; |
7726f813 | 971 | struct spar_vbus_headerinfo *hdr_info; |
3703987c | 972 | |
c6bc82f1 | 973 | POSTCODE_LINUX(BUS_CREATE_ENTRY_PC, 0, 0, DIAG_SEVERITY_PRINT); |
7726f813 DZ |
974 | |
975 | hdr_info = kzalloc(sizeof(*hdr_info), GFP_KERNEL); | |
c2c667d6 BR |
976 | if (!hdr_info) |
977 | return -ENOMEM; | |
7726f813 | 978 | |
343506bf DZ |
979 | dev_set_name(&dev->device, "visorbus%d", id); |
980 | dev->device.bus = &visorbus_type; | |
981 | dev->device.groups = visorbus_groups; | |
982 | dev->device.release = visorbus_release_busdevice; | |
d32517e3 | 983 | |
8217becc TS |
984 | dev->debugfs_dir = debugfs_create_dir(dev_name(&dev->device), |
985 | visorbus_debugfs_dir); | |
986 | if (!dev->debugfs_dir) { | |
987 | err = -ENOMEM; | |
988 | goto err_hdr_info; | |
989 | } | |
990 | dev->debugfs_client_bus_info = | |
b3d76e80 | 991 | debugfs_create_file("client_bus_info", 0440, |
8217becc TS |
992 | dev->debugfs_dir, dev, |
993 | &client_bus_info_debugfs_fops); | |
994 | if (!dev->debugfs_client_bus_info) { | |
995 | err = -ENOMEM; | |
996 | goto err_debugfs_dir; | |
997 | } | |
998 | ||
343506bf | 999 | if (device_register(&dev->device) < 0) { |
6daa8205 | 1000 | POSTCODE_LINUX(DEVICE_CREATE_FAILURE_PC, 0, id, |
c6bc82f1 | 1001 | DIAG_SEVERITY_ERR); |
8217becc TS |
1002 | err = -ENODEV; |
1003 | goto err_debugfs_created; | |
3703987c | 1004 | } |
d32517e3 | 1005 | |
ee983d90 DZ |
1006 | if (get_vbus_header_info(dev->visorchannel, hdr_info) >= 0) { |
1007 | dev->vbus_hdr_info = (void *)hdr_info; | |
1008 | write_vbus_chp_info(dev->visorchannel, hdr_info, | |
1009 | &chipset_driverinfo); | |
1010 | write_vbus_bus_info(dev->visorchannel, hdr_info, | |
1011 | &clientbus_driverinfo); | |
b32c4997 | 1012 | } else { |
ee983d90 | 1013 | kfree(hdr_info); |
3703987c | 1014 | } |
343506bf | 1015 | list_add_tail(&dev->list_all, &list_all_bus_instances); |
343506bf | 1016 | dev_set_drvdata(&dev->device, dev); |
d32517e3 | 1017 | return 0; |
8217becc TS |
1018 | |
1019 | err_debugfs_created: | |
1020 | debugfs_remove(dev->debugfs_client_bus_info); | |
1021 | ||
1022 | err_debugfs_dir: | |
1023 | debugfs_remove_recursive(dev->debugfs_dir); | |
1024 | ||
1025 | err_hdr_info: | |
1026 | kfree(hdr_info); | |
1027 | return err; | |
3703987c EA |
1028 | } |
1029 | ||
3fd1b3b6 DB |
1030 | /** |
1031 | * remove_bus_instance() - remove a device instance for the visor bus itself | |
1032 | * @dev: struct visor_device indentifying the bus to remove | |
3703987c EA |
1033 | */ |
1034 | static void | |
343506bf | 1035 | remove_bus_instance(struct visor_device *dev) |
3703987c | 1036 | { |
3fd1b3b6 DB |
1037 | /* |
1038 | * Note that this will result in the release method for | |
343506bf | 1039 | * dev->dev being called, which will call |
3703987c EA |
1040 | * visorbus_release_busdevice(). This has something to do with |
1041 | * the put_device() done in device_unregister(), but I have never | |
1042 | * successfully been able to trace thru the code to see where/how | |
1043 | * release() gets called. But I know it does. | |
1044 | */ | |
343506bf DZ |
1045 | if (dev->visorchannel) { |
1046 | visorchannel_destroy(dev->visorchannel); | |
1047 | dev->visorchannel = NULL; | |
3703987c | 1048 | } |
343506bf DZ |
1049 | kfree(dev->vbus_hdr_info); |
1050 | list_del(&dev->list_all); | |
1051 | device_unregister(&dev->device); | |
3703987c EA |
1052 | } |
1053 | ||
3fd1b3b6 DB |
1054 | /** |
1055 | * create_bus_type() - create and register the one-and-only one instance of | |
1056 | * the visor bus type (visorbus_type) | |
1057 | * Return: 0 for success, otherwise negative errno value returned by | |
1058 | * bus_register() indicating the reason for failure | |
3703987c EA |
1059 | */ |
1060 | static int | |
1061 | create_bus_type(void) | |
1062 | { | |
6155a3cf BR |
1063 | busreg_rc = bus_register(&visorbus_type); |
1064 | return busreg_rc; | |
3703987c EA |
1065 | } |
1066 | ||
3fd1b3b6 DB |
1067 | /** |
1068 | * remove_bus_type() - remove the one-and-only one instance of the visor bus | |
1069 | * type (visorbus_type) | |
3703987c EA |
1070 | */ |
1071 | static void | |
1072 | remove_bus_type(void) | |
1073 | { | |
3703987c EA |
1074 | bus_unregister(&visorbus_type); |
1075 | } | |
1076 | ||
3fd1b3b6 DB |
1077 | /** |
1078 | * remove_all_visor_devices() - remove all child visor bus device instances | |
3703987c EA |
1079 | */ |
1080 | static void | |
1081 | remove_all_visor_devices(void) | |
1082 | { | |
1083 | struct list_head *listentry, *listtmp; | |
1084 | ||
1085 | list_for_each_safe(listentry, listtmp, &list_all_device_instances) { | |
1086 | struct visor_device *dev = list_entry(listentry, | |
1087 | struct visor_device, | |
1088 | list_all); | |
1089 | remove_visor_device(dev); | |
1090 | } | |
1091 | } | |
1092 | ||
87241ab8 | 1093 | void |
d32517e3 | 1094 | chipset_bus_create(struct visor_device *dev) |
3703987c | 1095 | { |
d32517e3 DZ |
1096 | int rc; |
1097 | u32 bus_no = dev->chipset_bus_no; | |
3703987c | 1098 | |
c6bc82f1 | 1099 | POSTCODE_LINUX(BUS_CREATE_ENTRY_PC, 0, bus_no, DIAG_SEVERITY_PRINT); |
d32517e3 | 1100 | rc = create_bus_instance(dev); |
c6bc82f1 | 1101 | POSTCODE_LINUX(BUS_CREATE_EXIT_PC, 0, bus_no, DIAG_SEVERITY_PRINT); |
d32517e3 DZ |
1102 | |
1103 | if (rc < 0) | |
6daa8205 | 1104 | POSTCODE_LINUX(BUS_CREATE_FAILURE_PC, 0, bus_no, |
c6bc82f1 | 1105 | DIAG_SEVERITY_ERR); |
d32517e3 | 1106 | else |
6daa8205 | 1107 | POSTCODE_LINUX(CHIPSET_INIT_SUCCESS_PC, 0, bus_no, |
c6bc82f1 | 1108 | DIAG_SEVERITY_PRINT); |
d32517e3 | 1109 | |
87241ab8 | 1110 | bus_create_response(dev, rc); |
3703987c EA |
1111 | } |
1112 | ||
87241ab8 | 1113 | void |
d32517e3 | 1114 | chipset_bus_destroy(struct visor_device *dev) |
3703987c | 1115 | { |
343506bf | 1116 | remove_bus_instance(dev); |
87241ab8 | 1117 | bus_destroy_response(dev, 0); |
3703987c EA |
1118 | } |
1119 | ||
87241ab8 | 1120 | void |
a298bc0b | 1121 | chipset_device_create(struct visor_device *dev_info) |
3703987c | 1122 | { |
7a9749be | 1123 | int rc; |
a298bc0b DZ |
1124 | u32 bus_no = dev_info->chipset_bus_no; |
1125 | u32 dev_no = dev_info->chipset_dev_no; | |
3703987c | 1126 | |
f30c2c35 | 1127 | POSTCODE_LINUX(DEVICE_CREATE_ENTRY_PC, dev_no, bus_no, |
c6bc82f1 | 1128 | DIAG_SEVERITY_PRINT); |
3703987c | 1129 | |
a298bc0b | 1130 | rc = create_visor_device(dev_info); |
87241ab8 | 1131 | device_create_response(dev_info, rc); |
86ea8acc DK |
1132 | |
1133 | if (rc < 0) | |
f30c2c35 | 1134 | POSTCODE_LINUX(DEVICE_CREATE_FAILURE_PC, dev_no, bus_no, |
c6bc82f1 | 1135 | DIAG_SEVERITY_ERR); |
86ea8acc | 1136 | else |
f30c2c35 | 1137 | POSTCODE_LINUX(DEVICE_CREATE_SUCCESS_PC, dev_no, bus_no, |
c6bc82f1 | 1138 | DIAG_SEVERITY_PRINT); |
3703987c EA |
1139 | } |
1140 | ||
87241ab8 | 1141 | void |
a298bc0b | 1142 | chipset_device_destroy(struct visor_device *dev_info) |
3703987c | 1143 | { |
a298bc0b | 1144 | remove_visor_device(dev_info); |
3703987c | 1145 | |
87241ab8 | 1146 | device_destroy_response(dev_info, 0); |
3703987c EA |
1147 | } |
1148 | ||
3fd1b3b6 DB |
1149 | /** |
1150 | * pause_state_change_complete() - the callback function to be called by a | |
1151 | * visorbus function driver when a | |
1152 | * pending "pause device" operation has | |
1153 | * completed | |
1154 | * @dev: struct visor_device identifying the paused device | |
1155 | * @status: 0 iff the pause state change completed successfully, otherwise | |
1156 | * a negative errno value indicating the reason for failure | |
3703987c EA |
1157 | */ |
1158 | static void | |
a298bc0b | 1159 | pause_state_change_complete(struct visor_device *dev, int status) |
3703987c EA |
1160 | { |
1161 | if (!dev->pausing) | |
216c3e2c | 1162 | return; |
3703987c | 1163 | |
779d0752 | 1164 | dev->pausing = false; |
3703987c | 1165 | |
ea3a5aaf | 1166 | device_pause_response(dev, status); |
3703987c EA |
1167 | } |
1168 | ||
3fd1b3b6 DB |
1169 | /** |
1170 | * resume_state_change_complete() - the callback function to be called by a | |
1171 | * visorbus function driver when a | |
1172 | * pending "resume device" operation has | |
1173 | * completed | |
1174 | * @dev: struct visor_device identifying the resumed device | |
1175 | * @status: 0 iff the resume state change completed successfully, otherwise | |
1176 | * a negative errno value indicating the reason for failure | |
3703987c EA |
1177 | */ |
1178 | static void | |
a298bc0b | 1179 | resume_state_change_complete(struct visor_device *dev, int status) |
3703987c EA |
1180 | { |
1181 | if (!dev->resuming) | |
216c3e2c | 1182 | return; |
3703987c | 1183 | |
779d0752 | 1184 | dev->resuming = false; |
3703987c | 1185 | |
3fd1b3b6 DB |
1186 | /* |
1187 | * Notify the chipset driver that the resume is complete, | |
3703987c | 1188 | * which will presumably want to send some sort of response to |
48117895 GL |
1189 | * the initiator. |
1190 | */ | |
87241ab8 | 1191 | device_resume_response(dev, status); |
3703987c EA |
1192 | } |
1193 | ||
3fd1b3b6 DB |
1194 | /** |
1195 | * initiate_chipset_device_pause_resume() - start a pause or resume operation | |
1196 | * for a visor device | |
1197 | * @dev: struct visor_device identifying the device being paused or resumed | |
1198 | * @is_pause: true to indicate pause operation, false to indicate resume | |
1199 | * | |
1200 | * Tell the subordinate function driver for a specific device to pause | |
1201 | * or resume that device. Success/failure result is returned asynchronously | |
1202 | * via a callback function; see pause_state_change_complete() and | |
1203 | * resume_state_change_complete(). | |
3703987c EA |
1204 | */ |
1205 | static void | |
a298bc0b | 1206 | initiate_chipset_device_pause_resume(struct visor_device *dev, bool is_pause) |
3703987c | 1207 | { |
03b93f08 | 1208 | int rc; |
3703987c | 1209 | struct visor_driver *drv = NULL; |
a298bc0b | 1210 | void (*notify_func)(struct visor_device *dev, int response) = NULL; |
3703987c EA |
1211 | |
1212 | if (is_pause) | |
ea3a5aaf | 1213 | notify_func = device_pause_response; |
3703987c | 1214 | else |
87241ab8 | 1215 | notify_func = device_resume_response; |
3703987c | 1216 | if (!notify_func) |
03b93f08 | 1217 | return; |
3703987c | 1218 | |
3703987c | 1219 | drv = to_visor_driver(dev->device.driver); |
03b93f08 BR |
1220 | if (!drv) { |
1221 | (*notify_func)(dev, -ENODEV); | |
1222 | return; | |
1223 | } | |
3703987c | 1224 | |
03b93f08 BR |
1225 | if (dev->pausing || dev->resuming) { |
1226 | (*notify_func)(dev, -EBUSY); | |
1227 | return; | |
1228 | } | |
3703987c | 1229 | |
3fd1b3b6 DB |
1230 | /* |
1231 | * Note that even though both drv->pause() and drv->resume | |
3703987c EA |
1232 | * specify a callback function, it is NOT necessary for us to |
1233 | * increment our local module usage count. Reason is, there | |
1234 | * is already a linkage dependency between child function | |
1235 | * drivers and visorbus, so it is already IMPOSSIBLE to unload | |
1236 | * visorbus while child function drivers are still running. | |
1237 | */ | |
1238 | if (is_pause) { | |
03b93f08 BR |
1239 | if (!drv->pause) { |
1240 | (*notify_func)(dev, -EINVAL); | |
1241 | return; | |
1242 | } | |
3703987c | 1243 | |
779d0752 | 1244 | dev->pausing = true; |
03b93f08 | 1245 | rc = drv->pause(dev, pause_state_change_complete); |
3703987c EA |
1246 | } else { |
1247 | /* This should be done at BUS resume time, but an | |
1248 | * existing problem prevents us from ever getting a bus | |
1249 | * resume... This hack would fail to work should we | |
1250 | * ever have a bus that contains NO devices, since we | |
48117895 GL |
1251 | * would never even get here in that case. |
1252 | */ | |
3703987c | 1253 | fix_vbus_dev_info(dev); |
03b93f08 BR |
1254 | if (!drv->resume) { |
1255 | (*notify_func)(dev, -EINVAL); | |
1256 | return; | |
1257 | } | |
3703987c | 1258 | |
779d0752 | 1259 | dev->resuming = true; |
03b93f08 | 1260 | rc = drv->resume(dev, resume_state_change_complete); |
3703987c | 1261 | } |
03b93f08 | 1262 | if (rc < 0) { |
3703987c | 1263 | if (is_pause) |
779d0752 | 1264 | dev->pausing = false; |
3703987c | 1265 | else |
779d0752 | 1266 | dev->resuming = false; |
03b93f08 | 1267 | (*notify_func)(dev, -EINVAL); |
3703987c EA |
1268 | } |
1269 | } | |
1270 | ||
3fd1b3b6 DB |
1271 | /** |
1272 | * chipset_device_pause() - start a pause operation for a visor device | |
1273 | * @dev_info: struct visor_device identifying the device being paused | |
1274 | * | |
1275 | * Tell the subordinate function driver for a specific device to pause | |
1276 | * that device. Success/failure result is returned asynchronously | |
1277 | * via a callback function; see pause_state_change_complete(). | |
1278 | */ | |
87241ab8 | 1279 | void |
a298bc0b | 1280 | chipset_device_pause(struct visor_device *dev_info) |
3703987c | 1281 | { |
b4b598fd | 1282 | initiate_chipset_device_pause_resume(dev_info, true); |
3703987c EA |
1283 | } |
1284 | ||
3fd1b3b6 DB |
1285 | /** |
1286 | * chipset_device_resume() - start a resume operation for a visor device | |
1287 | * @dev_info: struct visor_device identifying the device being resumed | |
1288 | * | |
1289 | * Tell the subordinate function driver for a specific device to resume | |
1290 | * that device. Success/failure result is returned asynchronously | |
1291 | * via a callback function; see resume_state_change_complete(). | |
1292 | */ | |
87241ab8 | 1293 | void |
a298bc0b | 1294 | chipset_device_resume(struct visor_device *dev_info) |
3703987c | 1295 | { |
b4b598fd | 1296 | initiate_chipset_device_pause_resume(dev_info, false); |
3703987c EA |
1297 | } |
1298 | ||
55c67dca | 1299 | int |
3703987c EA |
1300 | visorbus_init(void) |
1301 | { | |
78af1aef | 1302 | int err; |
3703987c | 1303 | |
c6bc82f1 | 1304 | POSTCODE_LINUX(DRIVER_ENTRY_PC, 0, 0, DIAG_SEVERITY_PRINT); |
8217becc TS |
1305 | |
1306 | visorbus_debugfs_dir = debugfs_create_dir("visorbus", NULL); | |
1307 | if (!visorbus_debugfs_dir) | |
1308 | return -ENOMEM; | |
1309 | ||
e82ed633 | 1310 | bus_device_info_init(&clientbus_driverinfo, "clientbus", "visorbus"); |
3703987c | 1311 | |
78af1aef DK |
1312 | err = create_bus_type(); |
1313 | if (err < 0) { | |
3840b772 | 1314 | POSTCODE_LINUX(BUS_CREATE_ENTRY_PC, 0, 0, DIAG_SEVERITY_ERR); |
78af1aef | 1315 | goto error; |
3703987c EA |
1316 | } |
1317 | ||
e82ed633 | 1318 | bus_device_info_init(&chipset_driverinfo, "chipset", "visorchipset"); |
3703987c | 1319 | |
78af1aef | 1320 | return 0; |
3703987c | 1321 | |
78af1aef | 1322 | error: |
c6bc82f1 | 1323 | POSTCODE_LINUX(CHIPSET_INIT_FAILURE_PC, 0, err, DIAG_SEVERITY_ERR); |
78af1aef | 1324 | return err; |
3703987c EA |
1325 | } |
1326 | ||
c79b28f7 | 1327 | void |
3703987c EA |
1328 | visorbus_exit(void) |
1329 | { | |
1330 | struct list_head *listentry, *listtmp; | |
1331 | ||
3703987c EA |
1332 | remove_all_visor_devices(); |
1333 | ||
3703987c | 1334 | list_for_each_safe(listentry, listtmp, &list_all_bus_instances) { |
343506bf | 1335 | struct visor_device *dev = list_entry(listentry, |
216c3e2c CJ |
1336 | struct visor_device, |
1337 | list_all); | |
343506bf | 1338 | remove_bus_instance(dev); |
3703987c EA |
1339 | } |
1340 | remove_bus_type(); | |
8217becc | 1341 | debugfs_remove_recursive(visorbus_debugfs_dir); |
3703987c EA |
1342 | } |
1343 | ||
b3d76e80 | 1344 | module_param_named(forcematch, visorbus_forcematch, int, 0444); |
3703987c EA |
1345 | MODULE_PARM_DESC(visorbus_forcematch, |
1346 | "1 to force a successful dev <--> drv match"); | |
3703987c | 1347 | |
b3d76e80 | 1348 | module_param_named(forcenomatch, visorbus_forcenomatch, int, 0444); |
3703987c EA |
1349 | MODULE_PARM_DESC(visorbus_forcenomatch, |
1350 | "1 to force an UNsuccessful dev <--> drv match"); |