Merge branch 'fixes-2.6.24' of master.kernel.org:/pub/scm/linux/kernel/git/galak...
[linux-2.6] / drivers / ieee1394 / nodemgr.c
1 /*
2  * Node information (ConfigROM) collection and management.
3  *
4  * Copyright (C) 2000           Andreas E. Bombe
5  *               2001-2003      Ben Collins <bcollins@debian.net>
6  *
7  * This code is licensed under the GPL.  See the file COPYING in the root
8  * directory of the kernel sources for details.
9  */
10
11 #include <linux/bitmap.h>
12 #include <linux/kernel.h>
13 #include <linux/list.h>
14 #include <linux/slab.h>
15 #include <linux/delay.h>
16 #include <linux/kthread.h>
17 #include <linux/module.h>
18 #include <linux/moduleparam.h>
19 #include <linux/mutex.h>
20 #include <linux/freezer.h>
21 #include <asm/atomic.h>
22 #include <asm/semaphore.h>
23
24 #include "csr.h"
25 #include "highlevel.h"
26 #include "hosts.h"
27 #include "ieee1394.h"
28 #include "ieee1394_core.h"
29 #include "ieee1394_hotplug.h"
30 #include "ieee1394_types.h"
31 #include "ieee1394_transactions.h"
32 #include "nodemgr.h"
33
34 static int ignore_drivers;
35 module_param(ignore_drivers, int, S_IRUGO | S_IWUSR);
36 MODULE_PARM_DESC(ignore_drivers, "Disable automatic probing for drivers.");
37
38 struct nodemgr_csr_info {
39         struct hpsb_host *host;
40         nodeid_t nodeid;
41         unsigned int generation;
42         unsigned int speed_unverified:1;
43 };
44
45
46 /*
47  * Correct the speed map entry.  This is necessary
48  *  - for nodes with link speed < phy speed,
49  *  - for 1394b nodes with negotiated phy port speed < IEEE1394_SPEED_MAX.
50  * A possible speed is determined by trial and error, using quadlet reads.
51  */
52 static int nodemgr_check_speed(struct nodemgr_csr_info *ci, u64 addr,
53                                quadlet_t *buffer)
54 {
55         quadlet_t q;
56         u8 i, *speed, old_speed, good_speed;
57         int error;
58
59         speed = &(ci->host->speed[NODEID_TO_NODE(ci->nodeid)]);
60         old_speed = *speed;
61         good_speed = IEEE1394_SPEED_MAX + 1;
62
63         /* Try every speed from S100 to old_speed.
64          * If we did it the other way around, a too low speed could be caught
65          * if the retry succeeded for some other reason, e.g. because the link
66          * just finished its initialization. */
67         for (i = IEEE1394_SPEED_100; i <= old_speed; i++) {
68                 *speed = i;
69                 error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
70                                   &q, sizeof(quadlet_t));
71                 if (error)
72                         break;
73                 *buffer = q;
74                 good_speed = i;
75         }
76         if (good_speed <= IEEE1394_SPEED_MAX) {
77                 HPSB_DEBUG("Speed probe of node " NODE_BUS_FMT " yields %s",
78                            NODE_BUS_ARGS(ci->host, ci->nodeid),
79                            hpsb_speedto_str[good_speed]);
80                 *speed = good_speed;
81                 ci->speed_unverified = 0;
82                 return 0;
83         }
84         *speed = old_speed;
85         return error;
86 }
87
88 static int nodemgr_bus_read(struct csr1212_csr *csr, u64 addr, u16 length,
89                             void *buffer, void *__ci)
90 {
91         struct nodemgr_csr_info *ci = (struct nodemgr_csr_info*)__ci;
92         int i, error;
93
94         for (i = 1; ; i++) {
95                 error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
96                                   buffer, length);
97                 if (!error) {
98                         ci->speed_unverified = 0;
99                         break;
100                 }
101                 /* Give up after 3rd failure. */
102                 if (i == 3)
103                         break;
104
105                 /* The ieee1394_core guessed the node's speed capability from
106                  * the self ID.  Check whether a lower speed works. */
107                 if (ci->speed_unverified && length == sizeof(quadlet_t)) {
108                         error = nodemgr_check_speed(ci, addr, buffer);
109                         if (!error)
110                                 break;
111                 }
112                 if (msleep_interruptible(334))
113                         return -EINTR;
114         }
115         return error;
116 }
117
118 static int nodemgr_get_max_rom(quadlet_t *bus_info_data, void *__ci)
119 {
120         return (be32_to_cpu(bus_info_data[2]) >> 8) & 0x3;
121 }
122
123 static struct csr1212_bus_ops nodemgr_csr_ops = {
124         .bus_read =     nodemgr_bus_read,
125         .get_max_rom =  nodemgr_get_max_rom
126 };
127
128
129 /*
130  * Basically what we do here is start off retrieving the bus_info block.
131  * From there will fill in some info about the node, verify it is of IEEE
132  * 1394 type, and that the crc checks out ok. After that we start off with
133  * the root directory, and subdirectories. To do this, we retrieve the
134  * quadlet header for a directory, find out the length, and retrieve the
135  * complete directory entry (be it a leaf or a directory). We then process
136  * it and add the info to our structure for that particular node.
137  *
138  * We verify CRC's along the way for each directory/block/leaf. The entire
139  * node structure is generic, and simply stores the information in a way
140  * that's easy to parse by the protocol interface.
141  */
142
143 /*
144  * The nodemgr relies heavily on the Driver Model for device callbacks and
145  * driver/device mappings. The old nodemgr used to handle all this itself,
146  * but now we are much simpler because of the LDM.
147  */
148
149 struct host_info {
150         struct hpsb_host *host;
151         struct list_head list;
152         struct task_struct *thread;
153 };
154
155 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv);
156 static int nodemgr_uevent(struct device *dev, struct kobj_uevent_env *env);
157 static void nodemgr_resume_ne(struct node_entry *ne);
158 static void nodemgr_remove_ne(struct node_entry *ne);
159 static struct node_entry *find_entry_by_guid(u64 guid);
160
161 struct bus_type ieee1394_bus_type = {
162         .name           = "ieee1394",
163         .match          = nodemgr_bus_match,
164 };
165
166 static void host_cls_release(struct device *dev)
167 {
168         put_device(&container_of((dev), struct hpsb_host, host_dev)->device);
169 }
170
171 struct class hpsb_host_class = {
172         .name           = "ieee1394_host",
173         .dev_release    = host_cls_release,
174 };
175
176 static void ne_cls_release(struct device *dev)
177 {
178         put_device(&container_of((dev), struct node_entry, node_dev)->device);
179 }
180
181 static struct class nodemgr_ne_class = {
182         .name           = "ieee1394_node",
183         .dev_release    = ne_cls_release,
184 };
185
186 static void ud_cls_release(struct device *dev)
187 {
188         put_device(&container_of((dev), struct unit_directory, unit_dev)->device);
189 }
190
191 /* The name here is only so that unit directory hotplug works with old
192  * style hotplug, which only ever did unit directories anyway.
193  */
194 static struct class nodemgr_ud_class = {
195         .name           = "ieee1394",
196         .dev_release    = ud_cls_release,
197         .dev_uevent     = nodemgr_uevent,
198 };
199
200 static struct hpsb_highlevel nodemgr_highlevel;
201
202
203 static void nodemgr_release_ud(struct device *dev)
204 {
205         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
206
207         if (ud->vendor_name_kv)
208                 csr1212_release_keyval(ud->vendor_name_kv);
209         if (ud->model_name_kv)
210                 csr1212_release_keyval(ud->model_name_kv);
211
212         kfree(ud);
213 }
214
215 static void nodemgr_release_ne(struct device *dev)
216 {
217         struct node_entry *ne = container_of(dev, struct node_entry, device);
218
219         if (ne->vendor_name_kv)
220                 csr1212_release_keyval(ne->vendor_name_kv);
221
222         kfree(ne);
223 }
224
225
226 static void nodemgr_release_host(struct device *dev)
227 {
228         struct hpsb_host *host = container_of(dev, struct hpsb_host, device);
229
230         csr1212_destroy_csr(host->csr.rom);
231
232         kfree(host);
233 }
234
235 static int nodemgr_ud_platform_data;
236
237 static struct device nodemgr_dev_template_ud = {
238         .bus            = &ieee1394_bus_type,
239         .release        = nodemgr_release_ud,
240         .platform_data  = &nodemgr_ud_platform_data,
241 };
242
243 static struct device nodemgr_dev_template_ne = {
244         .bus            = &ieee1394_bus_type,
245         .release        = nodemgr_release_ne,
246 };
247
248 /* This dummy driver prevents the host devices from being scanned. We have no
249  * useful drivers for them yet, and there would be a deadlock possible if the
250  * driver core scans the host device while the host's low-level driver (i.e.
251  * the host's parent device) is being removed. */
252 static struct device_driver nodemgr_mid_layer_driver = {
253         .bus            = &ieee1394_bus_type,
254         .name           = "nodemgr",
255         .owner          = THIS_MODULE,
256 };
257
258 struct device nodemgr_dev_template_host = {
259         .bus            = &ieee1394_bus_type,
260         .release        = nodemgr_release_host,
261 };
262
263
264 #define fw_attr(class, class_type, field, type, format_string)          \
265 static ssize_t fw_show_##class##_##field (struct device *dev, struct device_attribute *attr, char *buf)\
266 {                                                                       \
267         class_type *class;                                              \
268         class = container_of(dev, class_type, device);                  \
269         return sprintf(buf, format_string, (type)class->field);         \
270 }                                                                       \
271 static struct device_attribute dev_attr_##class##_##field = {           \
272         .attr = {.name = __stringify(field), .mode = S_IRUGO },         \
273         .show   = fw_show_##class##_##field,                            \
274 };
275
276 #define fw_attr_td(class, class_type, td_kv)                            \
277 static ssize_t fw_show_##class##_##td_kv (struct device *dev, struct device_attribute *attr, char *buf)\
278 {                                                                       \
279         int len;                                                        \
280         class_type *class = container_of(dev, class_type, device);      \
281         len = (class->td_kv->value.leaf.len - 2) * sizeof(quadlet_t);   \
282         memcpy(buf,                                                     \
283                CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(class->td_kv),      \
284                len);                                                    \
285         while (buf[len - 1] == '\0')                                    \
286                 len--;                                                  \
287         buf[len++] = '\n';                                              \
288         buf[len] = '\0';                                                \
289         return len;                                                     \
290 }                                                                       \
291 static struct device_attribute dev_attr_##class##_##td_kv = {           \
292         .attr = {.name = __stringify(td_kv), .mode = S_IRUGO },         \
293         .show   = fw_show_##class##_##td_kv,                            \
294 };
295
296
297 #define fw_drv_attr(field, type, format_string)                 \
298 static ssize_t fw_drv_show_##field (struct device_driver *drv, char *buf) \
299 {                                                               \
300         struct hpsb_protocol_driver *driver;                    \
301         driver = container_of(drv, struct hpsb_protocol_driver, driver); \
302         return sprintf(buf, format_string, (type)driver->field);\
303 }                                                               \
304 static struct driver_attribute driver_attr_drv_##field = {      \
305         .attr = {.name = __stringify(field), .mode = S_IRUGO }, \
306         .show   = fw_drv_show_##field,                          \
307 };
308
309
310 static ssize_t fw_show_ne_bus_options(struct device *dev, struct device_attribute *attr, char *buf)
311 {
312         struct node_entry *ne = container_of(dev, struct node_entry, device);
313
314         return sprintf(buf, "IRMC(%d) CMC(%d) ISC(%d) BMC(%d) PMC(%d) GEN(%d) "
315                        "LSPD(%d) MAX_REC(%d) MAX_ROM(%d) CYC_CLK_ACC(%d)\n",
316                        ne->busopt.irmc,
317                        ne->busopt.cmc, ne->busopt.isc, ne->busopt.bmc,
318                        ne->busopt.pmc, ne->busopt.generation, ne->busopt.lnkspd,
319                        ne->busopt.max_rec,
320                        ne->busopt.max_rom,
321                        ne->busopt.cyc_clk_acc);
322 }
323 static DEVICE_ATTR(bus_options,S_IRUGO,fw_show_ne_bus_options,NULL);
324
325
326 #ifdef HPSB_DEBUG_TLABELS
327 static ssize_t fw_show_ne_tlabels_free(struct device *dev,
328                                        struct device_attribute *attr, char *buf)
329 {
330         struct node_entry *ne = container_of(dev, struct node_entry, device);
331         unsigned long flags;
332         unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
333         int tf;
334
335         spin_lock_irqsave(&hpsb_tlabel_lock, flags);
336         tf = 64 - bitmap_weight(tp, 64);
337         spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
338
339         return sprintf(buf, "%d\n", tf);
340 }
341 static DEVICE_ATTR(tlabels_free,S_IRUGO,fw_show_ne_tlabels_free,NULL);
342
343
344 static ssize_t fw_show_ne_tlabels_mask(struct device *dev,
345                                        struct device_attribute *attr, char *buf)
346 {
347         struct node_entry *ne = container_of(dev, struct node_entry, device);
348         unsigned long flags;
349         unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
350         u64 tm;
351
352         spin_lock_irqsave(&hpsb_tlabel_lock, flags);
353 #if (BITS_PER_LONG <= 32)
354         tm = ((u64)tp[0] << 32) + tp[1];
355 #else
356         tm = tp[0];
357 #endif
358         spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
359
360         return sprintf(buf, "0x%016llx\n", (unsigned long long)tm);
361 }
362 static DEVICE_ATTR(tlabels_mask, S_IRUGO, fw_show_ne_tlabels_mask, NULL);
363 #endif /* HPSB_DEBUG_TLABELS */
364
365
366 static ssize_t fw_set_ignore_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
367 {
368         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
369         int state = simple_strtoul(buf, NULL, 10);
370
371         if (state == 1) {
372                 ud->ignore_driver = 1;
373                 device_release_driver(dev);
374         } else if (state == 0)
375                 ud->ignore_driver = 0;
376
377         return count;
378 }
379 static ssize_t fw_get_ignore_driver(struct device *dev, struct device_attribute *attr, char *buf)
380 {
381         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
382
383         return sprintf(buf, "%d\n", ud->ignore_driver);
384 }
385 static DEVICE_ATTR(ignore_driver, S_IWUSR | S_IRUGO, fw_get_ignore_driver, fw_set_ignore_driver);
386
387
388 static ssize_t fw_set_destroy_node(struct bus_type *bus, const char *buf, size_t count)
389 {
390         struct node_entry *ne;
391         u64 guid = (u64)simple_strtoull(buf, NULL, 16);
392
393         ne = find_entry_by_guid(guid);
394
395         if (ne == NULL || !ne->in_limbo)
396                 return -EINVAL;
397
398         nodemgr_remove_ne(ne);
399
400         return count;
401 }
402 static ssize_t fw_get_destroy_node(struct bus_type *bus, char *buf)
403 {
404         return sprintf(buf, "You can destroy in_limbo nodes by writing their GUID to this file\n");
405 }
406 static BUS_ATTR(destroy_node, S_IWUSR | S_IRUGO, fw_get_destroy_node, fw_set_destroy_node);
407
408
409 static ssize_t fw_set_rescan(struct bus_type *bus, const char *buf,
410                              size_t count)
411 {
412         int error = 0;
413
414         if (simple_strtoul(buf, NULL, 10) == 1)
415                 error = bus_rescan_devices(&ieee1394_bus_type);
416         return error ? error : count;
417 }
418 static ssize_t fw_get_rescan(struct bus_type *bus, char *buf)
419 {
420         return sprintf(buf, "You can force a rescan of the bus for "
421                         "drivers by writing a 1 to this file\n");
422 }
423 static BUS_ATTR(rescan, S_IWUSR | S_IRUGO, fw_get_rescan, fw_set_rescan);
424
425
426 static ssize_t fw_set_ignore_drivers(struct bus_type *bus, const char *buf, size_t count)
427 {
428         int state = simple_strtoul(buf, NULL, 10);
429
430         if (state == 1)
431                 ignore_drivers = 1;
432         else if (state == 0)
433                 ignore_drivers = 0;
434
435         return count;
436 }
437 static ssize_t fw_get_ignore_drivers(struct bus_type *bus, char *buf)
438 {
439         return sprintf(buf, "%d\n", ignore_drivers);
440 }
441 static BUS_ATTR(ignore_drivers, S_IWUSR | S_IRUGO, fw_get_ignore_drivers, fw_set_ignore_drivers);
442
443
444 struct bus_attribute *const fw_bus_attrs[] = {
445         &bus_attr_destroy_node,
446         &bus_attr_rescan,
447         &bus_attr_ignore_drivers,
448         NULL
449 };
450
451
452 fw_attr(ne, struct node_entry, capabilities, unsigned int, "0x%06x\n")
453 fw_attr(ne, struct node_entry, nodeid, unsigned int, "0x%04x\n")
454
455 fw_attr(ne, struct node_entry, vendor_id, unsigned int, "0x%06x\n")
456 fw_attr_td(ne, struct node_entry, vendor_name_kv)
457
458 fw_attr(ne, struct node_entry, guid, unsigned long long, "0x%016Lx\n")
459 fw_attr(ne, struct node_entry, guid_vendor_id, unsigned int, "0x%06x\n")
460 fw_attr(ne, struct node_entry, in_limbo, int, "%d\n");
461
462 static struct device_attribute *const fw_ne_attrs[] = {
463         &dev_attr_ne_guid,
464         &dev_attr_ne_guid_vendor_id,
465         &dev_attr_ne_capabilities,
466         &dev_attr_ne_vendor_id,
467         &dev_attr_ne_nodeid,
468         &dev_attr_bus_options,
469 #ifdef HPSB_DEBUG_TLABELS
470         &dev_attr_tlabels_free,
471         &dev_attr_tlabels_mask,
472 #endif
473 };
474
475
476
477 fw_attr(ud, struct unit_directory, address, unsigned long long, "0x%016Lx\n")
478 fw_attr(ud, struct unit_directory, length, int, "%d\n")
479 /* These are all dependent on the value being provided */
480 fw_attr(ud, struct unit_directory, vendor_id, unsigned int, "0x%06x\n")
481 fw_attr(ud, struct unit_directory, model_id, unsigned int, "0x%06x\n")
482 fw_attr(ud, struct unit_directory, specifier_id, unsigned int, "0x%06x\n")
483 fw_attr(ud, struct unit_directory, version, unsigned int, "0x%06x\n")
484 fw_attr_td(ud, struct unit_directory, vendor_name_kv)
485 fw_attr_td(ud, struct unit_directory, model_name_kv)
486
487 static struct device_attribute *const fw_ud_attrs[] = {
488         &dev_attr_ud_address,
489         &dev_attr_ud_length,
490         &dev_attr_ignore_driver,
491 };
492
493
494 fw_attr(host, struct hpsb_host, node_count, int, "%d\n")
495 fw_attr(host, struct hpsb_host, selfid_count, int, "%d\n")
496 fw_attr(host, struct hpsb_host, nodes_active, int, "%d\n")
497 fw_attr(host, struct hpsb_host, in_bus_reset, int, "%d\n")
498 fw_attr(host, struct hpsb_host, is_root, int, "%d\n")
499 fw_attr(host, struct hpsb_host, is_cycmst, int, "%d\n")
500 fw_attr(host, struct hpsb_host, is_irm, int, "%d\n")
501 fw_attr(host, struct hpsb_host, is_busmgr, int, "%d\n")
502
503 static struct device_attribute *const fw_host_attrs[] = {
504         &dev_attr_host_node_count,
505         &dev_attr_host_selfid_count,
506         &dev_attr_host_nodes_active,
507         &dev_attr_host_in_bus_reset,
508         &dev_attr_host_is_root,
509         &dev_attr_host_is_cycmst,
510         &dev_attr_host_is_irm,
511         &dev_attr_host_is_busmgr,
512 };
513
514
515 static ssize_t fw_show_drv_device_ids(struct device_driver *drv, char *buf)
516 {
517         struct hpsb_protocol_driver *driver;
518         struct ieee1394_device_id *id;
519         int length = 0;
520         char *scratch = buf;
521
522         driver = container_of(drv, struct hpsb_protocol_driver, driver);
523
524         for (id = driver->id_table; id->match_flags != 0; id++) {
525                 int need_coma = 0;
526
527                 if (id->match_flags & IEEE1394_MATCH_VENDOR_ID) {
528                         length += sprintf(scratch, "vendor_id=0x%06x", id->vendor_id);
529                         scratch = buf + length;
530                         need_coma++;
531                 }
532
533                 if (id->match_flags & IEEE1394_MATCH_MODEL_ID) {
534                         length += sprintf(scratch, "%smodel_id=0x%06x",
535                                           need_coma++ ? "," : "",
536                                           id->model_id);
537                         scratch = buf + length;
538                 }
539
540                 if (id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) {
541                         length += sprintf(scratch, "%sspecifier_id=0x%06x",
542                                           need_coma++ ? "," : "",
543                                           id->specifier_id);
544                         scratch = buf + length;
545                 }
546
547                 if (id->match_flags & IEEE1394_MATCH_VERSION) {
548                         length += sprintf(scratch, "%sversion=0x%06x",
549                                           need_coma++ ? "," : "",
550                                           id->version);
551                         scratch = buf + length;
552                 }
553
554                 if (need_coma) {
555                         *scratch++ = '\n';
556                         length++;
557                 }
558         }
559
560         return length;
561 }
562 static DRIVER_ATTR(device_ids,S_IRUGO,fw_show_drv_device_ids,NULL);
563
564
565 fw_drv_attr(name, const char *, "%s\n")
566
567 static struct driver_attribute *const fw_drv_attrs[] = {
568         &driver_attr_drv_name,
569         &driver_attr_device_ids,
570 };
571
572
573 static void nodemgr_create_drv_files(struct hpsb_protocol_driver *driver)
574 {
575         struct device_driver *drv = &driver->driver;
576         int i;
577
578         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
579                 if (driver_create_file(drv, fw_drv_attrs[i]))
580                         goto fail;
581         return;
582 fail:
583         HPSB_ERR("Failed to add sysfs attribute");
584 }
585
586
587 static void nodemgr_remove_drv_files(struct hpsb_protocol_driver *driver)
588 {
589         struct device_driver *drv = &driver->driver;
590         int i;
591
592         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
593                 driver_remove_file(drv, fw_drv_attrs[i]);
594 }
595
596
597 static void nodemgr_create_ne_dev_files(struct node_entry *ne)
598 {
599         struct device *dev = &ne->device;
600         int i;
601
602         for (i = 0; i < ARRAY_SIZE(fw_ne_attrs); i++)
603                 if (device_create_file(dev, fw_ne_attrs[i]))
604                         goto fail;
605         return;
606 fail:
607         HPSB_ERR("Failed to add sysfs attribute");
608 }
609
610
611 static void nodemgr_create_host_dev_files(struct hpsb_host *host)
612 {
613         struct device *dev = &host->device;
614         int i;
615
616         for (i = 0; i < ARRAY_SIZE(fw_host_attrs); i++)
617                 if (device_create_file(dev, fw_host_attrs[i]))
618                         goto fail;
619         return;
620 fail:
621         HPSB_ERR("Failed to add sysfs attribute");
622 }
623
624
625 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
626                                                nodeid_t nodeid);
627
628 static void nodemgr_update_host_dev_links(struct hpsb_host *host)
629 {
630         struct device *dev = &host->device;
631         struct node_entry *ne;
632
633         sysfs_remove_link(&dev->kobj, "irm_id");
634         sysfs_remove_link(&dev->kobj, "busmgr_id");
635         sysfs_remove_link(&dev->kobj, "host_id");
636
637         if ((ne = find_entry_by_nodeid(host, host->irm_id)) &&
638             sysfs_create_link(&dev->kobj, &ne->device.kobj, "irm_id"))
639                 goto fail;
640         if ((ne = find_entry_by_nodeid(host, host->busmgr_id)) &&
641             sysfs_create_link(&dev->kobj, &ne->device.kobj, "busmgr_id"))
642                 goto fail;
643         if ((ne = find_entry_by_nodeid(host, host->node_id)) &&
644             sysfs_create_link(&dev->kobj, &ne->device.kobj, "host_id"))
645                 goto fail;
646         return;
647 fail:
648         HPSB_ERR("Failed to update sysfs attributes for host %d", host->id);
649 }
650
651 static void nodemgr_create_ud_dev_files(struct unit_directory *ud)
652 {
653         struct device *dev = &ud->device;
654         int i;
655
656         for (i = 0; i < ARRAY_SIZE(fw_ud_attrs); i++)
657                 if (device_create_file(dev, fw_ud_attrs[i]))
658                         goto fail;
659         if (ud->flags & UNIT_DIRECTORY_SPECIFIER_ID)
660                 if (device_create_file(dev, &dev_attr_ud_specifier_id))
661                         goto fail;
662         if (ud->flags & UNIT_DIRECTORY_VERSION)
663                 if (device_create_file(dev, &dev_attr_ud_version))
664                         goto fail;
665         if (ud->flags & UNIT_DIRECTORY_VENDOR_ID) {
666                 if (device_create_file(dev, &dev_attr_ud_vendor_id))
667                         goto fail;
668                 if (ud->vendor_name_kv &&
669                     device_create_file(dev, &dev_attr_ud_vendor_name_kv))
670                         goto fail;
671         }
672         if (ud->flags & UNIT_DIRECTORY_MODEL_ID) {
673                 if (device_create_file(dev, &dev_attr_ud_model_id))
674                         goto fail;
675                 if (ud->model_name_kv &&
676                     device_create_file(dev, &dev_attr_ud_model_name_kv))
677                         goto fail;
678         }
679         return;
680 fail:
681         HPSB_ERR("Failed to add sysfs attribute");
682 }
683
684
685 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv)
686 {
687         struct hpsb_protocol_driver *driver;
688         struct unit_directory *ud;
689         struct ieee1394_device_id *id;
690
691         /* We only match unit directories */
692         if (dev->platform_data != &nodemgr_ud_platform_data)
693                 return 0;
694
695         ud = container_of(dev, struct unit_directory, device);
696         if (ud->ne->in_limbo || ud->ignore_driver)
697                 return 0;
698
699         /* We only match drivers of type hpsb_protocol_driver */
700         if (drv == &nodemgr_mid_layer_driver)
701                 return 0;
702
703         driver = container_of(drv, struct hpsb_protocol_driver, driver);
704         for (id = driver->id_table; id->match_flags != 0; id++) {
705                 if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) &&
706                     id->vendor_id != ud->vendor_id)
707                         continue;
708
709                 if ((id->match_flags & IEEE1394_MATCH_MODEL_ID) &&
710                     id->model_id != ud->model_id)
711                         continue;
712
713                 if ((id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) &&
714                     id->specifier_id != ud->specifier_id)
715                         continue;
716
717                 if ((id->match_flags & IEEE1394_MATCH_VERSION) &&
718                     id->version != ud->version)
719                         continue;
720
721                 return 1;
722         }
723
724         return 0;
725 }
726
727
728 static DEFINE_MUTEX(nodemgr_serialize_remove_uds);
729
730 static void nodemgr_remove_uds(struct node_entry *ne)
731 {
732         struct device *dev;
733         struct unit_directory *tmp, *ud;
734
735         /* Iteration over nodemgr_ud_class.devices has to be protected by
736          * nodemgr_ud_class.sem, but device_unregister() will eventually
737          * take nodemgr_ud_class.sem too. Therefore pick out one ud at a time,
738          * release the semaphore, and then unregister the ud. Since this code
739          * may be called from other contexts besides the knodemgrds, protect the
740          * gap after release of the semaphore by nodemgr_serialize_remove_uds.
741          */
742         mutex_lock(&nodemgr_serialize_remove_uds);
743         for (;;) {
744                 ud = NULL;
745                 down(&nodemgr_ud_class.sem);
746                 list_for_each_entry(dev, &nodemgr_ud_class.devices, node) {
747                         tmp = container_of(dev, struct unit_directory,
748                                            unit_dev);
749                         if (tmp->ne == ne) {
750                                 ud = tmp;
751                                 break;
752                         }
753                 }
754                 up(&nodemgr_ud_class.sem);
755                 if (ud == NULL)
756                         break;
757                 device_unregister(&ud->unit_dev);
758                 device_unregister(&ud->device);
759         }
760         mutex_unlock(&nodemgr_serialize_remove_uds);
761 }
762
763
764 static void nodemgr_remove_ne(struct node_entry *ne)
765 {
766         struct device *dev;
767
768         dev = get_device(&ne->device);
769         if (!dev)
770                 return;
771
772         HPSB_DEBUG("Node removed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
773                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
774         nodemgr_remove_uds(ne);
775
776         device_unregister(&ne->node_dev);
777         device_unregister(dev);
778
779         put_device(dev);
780 }
781
782 static int __nodemgr_remove_host_dev(struct device *dev, void *data)
783 {
784         if (dev->bus == &ieee1394_bus_type)
785                 nodemgr_remove_ne(container_of(dev, struct node_entry,
786                                   device));
787         return 0;
788 }
789
790 static void nodemgr_remove_host_dev(struct device *dev)
791 {
792         WARN_ON(device_for_each_child(dev, NULL, __nodemgr_remove_host_dev));
793         sysfs_remove_link(&dev->kobj, "irm_id");
794         sysfs_remove_link(&dev->kobj, "busmgr_id");
795         sysfs_remove_link(&dev->kobj, "host_id");
796 }
797
798
799 static void nodemgr_update_bus_options(struct node_entry *ne)
800 {
801 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
802         static const u16 mr[] = { 4, 64, 1024, 0};
803 #endif
804         quadlet_t busoptions = be32_to_cpu(ne->csr->bus_info_data[2]);
805
806         ne->busopt.irmc         = (busoptions >> 31) & 1;
807         ne->busopt.cmc          = (busoptions >> 30) & 1;
808         ne->busopt.isc          = (busoptions >> 29) & 1;
809         ne->busopt.bmc          = (busoptions >> 28) & 1;
810         ne->busopt.pmc          = (busoptions >> 27) & 1;
811         ne->busopt.cyc_clk_acc  = (busoptions >> 16) & 0xff;
812         ne->busopt.max_rec      = 1 << (((busoptions >> 12) & 0xf) + 1);
813         ne->busopt.max_rom      = (busoptions >> 8) & 0x3;
814         ne->busopt.generation   = (busoptions >> 4) & 0xf;
815         ne->busopt.lnkspd       = busoptions & 0x7;
816
817         HPSB_VERBOSE("NodeMgr: raw=0x%08x irmc=%d cmc=%d isc=%d bmc=%d pmc=%d "
818                      "cyc_clk_acc=%d max_rec=%d max_rom=%d gen=%d lspd=%d",
819                      busoptions, ne->busopt.irmc, ne->busopt.cmc,
820                      ne->busopt.isc, ne->busopt.bmc, ne->busopt.pmc,
821                      ne->busopt.cyc_clk_acc, ne->busopt.max_rec,
822                      mr[ne->busopt.max_rom],
823                      ne->busopt.generation, ne->busopt.lnkspd);
824 }
825
826
827 static struct node_entry *nodemgr_create_node(octlet_t guid, struct csr1212_csr *csr,
828                                               struct host_info *hi, nodeid_t nodeid,
829                                               unsigned int generation)
830 {
831         struct hpsb_host *host = hi->host;
832         struct node_entry *ne;
833
834         ne = kzalloc(sizeof(*ne), GFP_KERNEL);
835         if (!ne)
836                 goto fail_alloc;
837
838         ne->host = host;
839         ne->nodeid = nodeid;
840         ne->generation = generation;
841         ne->needs_probe = 1;
842
843         ne->guid = guid;
844         ne->guid_vendor_id = (guid >> 40) & 0xffffff;
845         ne->csr = csr;
846
847         memcpy(&ne->device, &nodemgr_dev_template_ne,
848                sizeof(ne->device));
849         ne->device.parent = &host->device;
850         snprintf(ne->device.bus_id, BUS_ID_SIZE, "%016Lx",
851                  (unsigned long long)(ne->guid));
852
853         ne->node_dev.parent = &ne->device;
854         ne->node_dev.class = &nodemgr_ne_class;
855         snprintf(ne->node_dev.bus_id, BUS_ID_SIZE, "%016Lx",
856                 (unsigned long long)(ne->guid));
857
858         if (device_register(&ne->device))
859                 goto fail_devreg;
860         if (device_register(&ne->node_dev))
861                 goto fail_classdevreg;
862         get_device(&ne->device);
863
864         nodemgr_create_ne_dev_files(ne);
865
866         nodemgr_update_bus_options(ne);
867
868         HPSB_DEBUG("%s added: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
869                    (host->node_id == nodeid) ? "Host" : "Node",
870                    NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
871
872         return ne;
873
874 fail_classdevreg:
875         device_unregister(&ne->device);
876 fail_devreg:
877         kfree(ne);
878 fail_alloc:
879         HPSB_ERR("Failed to create node ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
880                  NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
881
882         return NULL;
883 }
884
885
886 static struct node_entry *find_entry_by_guid(u64 guid)
887 {
888         struct device *dev;
889         struct node_entry *ne, *ret_ne = NULL;
890
891         down(&nodemgr_ne_class.sem);
892         list_for_each_entry(dev, &nodemgr_ne_class.devices, node) {
893                 ne = container_of(dev, struct node_entry, node_dev);
894
895                 if (ne->guid == guid) {
896                         ret_ne = ne;
897                         break;
898                 }
899         }
900         up(&nodemgr_ne_class.sem);
901
902         return ret_ne;
903 }
904
905
906 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
907                                                nodeid_t nodeid)
908 {
909         struct device *dev;
910         struct node_entry *ne, *ret_ne = NULL;
911
912         down(&nodemgr_ne_class.sem);
913         list_for_each_entry(dev, &nodemgr_ne_class.devices, node) {
914                 ne = container_of(dev, struct node_entry, node_dev);
915
916                 if (ne->host == host && ne->nodeid == nodeid) {
917                         ret_ne = ne;
918                         break;
919                 }
920         }
921         up(&nodemgr_ne_class.sem);
922
923         return ret_ne;
924 }
925
926
927 static void nodemgr_register_device(struct node_entry *ne, 
928         struct unit_directory *ud, struct device *parent)
929 {
930         memcpy(&ud->device, &nodemgr_dev_template_ud,
931                sizeof(ud->device));
932
933         ud->device.parent = parent;
934
935         snprintf(ud->device.bus_id, BUS_ID_SIZE, "%s-%u",
936                  ne->device.bus_id, ud->id);
937
938         ud->unit_dev.parent = &ud->device;
939         ud->unit_dev.class = &nodemgr_ud_class;
940         snprintf(ud->unit_dev.bus_id, BUS_ID_SIZE, "%s-%u",
941                  ne->device.bus_id, ud->id);
942
943         if (device_register(&ud->device))
944                 goto fail_devreg;
945         if (device_register(&ud->unit_dev))
946                 goto fail_classdevreg;
947         get_device(&ud->device);
948
949         nodemgr_create_ud_dev_files(ud);
950
951         return;
952
953 fail_classdevreg:
954         device_unregister(&ud->device);
955 fail_devreg:
956         HPSB_ERR("Failed to create unit %s", ud->device.bus_id);
957 }       
958
959
960 /* This implementation currently only scans the config rom and its
961  * immediate unit directories looking for software_id and
962  * software_version entries, in order to get driver autoloading working. */
963 static struct unit_directory *nodemgr_process_unit_directory
964         (struct host_info *hi, struct node_entry *ne, struct csr1212_keyval *ud_kv,
965          unsigned int *id, struct unit_directory *parent)
966 {
967         struct unit_directory *ud;
968         struct unit_directory *ud_child = NULL;
969         struct csr1212_dentry *dentry;
970         struct csr1212_keyval *kv;
971         u8 last_key_id = 0;
972
973         ud = kzalloc(sizeof(*ud), GFP_KERNEL);
974         if (!ud)
975                 goto unit_directory_error;
976
977         ud->ne = ne;
978         ud->ignore_driver = ignore_drivers;
979         ud->address = ud_kv->offset + CSR1212_REGISTER_SPACE_BASE;
980         ud->directory_id = ud->address & 0xffffff;
981         ud->ud_kv = ud_kv;
982         ud->id = (*id)++;
983
984         csr1212_for_each_dir_entry(ne->csr, kv, ud_kv, dentry) {
985                 switch (kv->key.id) {
986                 case CSR1212_KV_ID_VENDOR:
987                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
988                                 ud->vendor_id = kv->value.immediate;
989                                 ud->flags |= UNIT_DIRECTORY_VENDOR_ID;
990                         }
991                         break;
992
993                 case CSR1212_KV_ID_MODEL:
994                         ud->model_id = kv->value.immediate;
995                         ud->flags |= UNIT_DIRECTORY_MODEL_ID;
996                         break;
997
998                 case CSR1212_KV_ID_SPECIFIER_ID:
999                         ud->specifier_id = kv->value.immediate;
1000                         ud->flags |= UNIT_DIRECTORY_SPECIFIER_ID;
1001                         break;
1002
1003                 case CSR1212_KV_ID_VERSION:
1004                         ud->version = kv->value.immediate;
1005                         ud->flags |= UNIT_DIRECTORY_VERSION;
1006                         break;
1007
1008                 case CSR1212_KV_ID_DESCRIPTOR:
1009                         if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1010                             CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1011                             CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1012                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1013                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1014                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1015                                 switch (last_key_id) {
1016                                 case CSR1212_KV_ID_VENDOR:
1017                                         csr1212_keep_keyval(kv);
1018                                         ud->vendor_name_kv = kv;
1019                                         break;
1020
1021                                 case CSR1212_KV_ID_MODEL:
1022                                         csr1212_keep_keyval(kv);
1023                                         ud->model_name_kv = kv;
1024                                         break;
1025
1026                                 }
1027                         } /* else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) ... */
1028                         break;
1029
1030                 case CSR1212_KV_ID_DEPENDENT_INFO:
1031                         /* Logical Unit Number */
1032                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
1033                                 if (ud->flags & UNIT_DIRECTORY_HAS_LUN) {
1034                                         ud_child = kmemdup(ud, sizeof(*ud_child), GFP_KERNEL);
1035                                         if (!ud_child)
1036                                                 goto unit_directory_error;
1037                                         nodemgr_register_device(ne, ud_child, &ne->device);
1038                                         ud_child = NULL;
1039                                         
1040                                         ud->id = (*id)++;
1041                                 }
1042                                 ud->lun = kv->value.immediate;
1043                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN;
1044
1045                         /* Logical Unit Directory */
1046                         } else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) {
1047                                 /* This should really be done in SBP2 as this is
1048                                  * doing SBP2 specific parsing.
1049                                  */
1050                                 
1051                                 /* first register the parent unit */
1052                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN_DIRECTORY;
1053                                 if (ud->device.bus != &ieee1394_bus_type)
1054                                         nodemgr_register_device(ne, ud, &ne->device);
1055                                 
1056                                 /* process the child unit */
1057                                 ud_child = nodemgr_process_unit_directory(hi, ne, kv, id, ud);
1058
1059                                 if (ud_child == NULL)
1060                                         break;
1061                                 
1062                                 /* inherit unspecified values, the driver core picks it up */
1063                                 if ((ud->flags & UNIT_DIRECTORY_MODEL_ID) &&
1064                                     !(ud_child->flags & UNIT_DIRECTORY_MODEL_ID))
1065                                 {
1066                                         ud_child->flags |=  UNIT_DIRECTORY_MODEL_ID;
1067                                         ud_child->model_id = ud->model_id;
1068                                 }
1069                                 if ((ud->flags & UNIT_DIRECTORY_SPECIFIER_ID) &&
1070                                     !(ud_child->flags & UNIT_DIRECTORY_SPECIFIER_ID))
1071                                 {
1072                                         ud_child->flags |=  UNIT_DIRECTORY_SPECIFIER_ID;
1073                                         ud_child->specifier_id = ud->specifier_id;
1074                                 }
1075                                 if ((ud->flags & UNIT_DIRECTORY_VERSION) &&
1076                                     !(ud_child->flags & UNIT_DIRECTORY_VERSION))
1077                                 {
1078                                         ud_child->flags |=  UNIT_DIRECTORY_VERSION;
1079                                         ud_child->version = ud->version;
1080                                 }
1081                                 
1082                                 /* register the child unit */
1083                                 ud_child->flags |= UNIT_DIRECTORY_LUN_DIRECTORY;
1084                                 nodemgr_register_device(ne, ud_child, &ud->device);
1085                         }
1086
1087                         break;
1088
1089                 case CSR1212_KV_ID_DIRECTORY_ID:
1090                         ud->directory_id = kv->value.immediate;
1091                         break;
1092
1093                 default:
1094                         break;
1095                 }
1096                 last_key_id = kv->key.id;
1097         }
1098         
1099         /* do not process child units here and only if not already registered */
1100         if (!parent && ud->device.bus != &ieee1394_bus_type)
1101                 nodemgr_register_device(ne, ud, &ne->device);
1102
1103         return ud;
1104
1105 unit_directory_error:
1106         kfree(ud);
1107         return NULL;
1108 }
1109
1110
1111 static void nodemgr_process_root_directory(struct host_info *hi, struct node_entry *ne)
1112 {
1113         unsigned int ud_id = 0;
1114         struct csr1212_dentry *dentry;
1115         struct csr1212_keyval *kv, *vendor_name_kv = NULL;
1116         u8 last_key_id = 0;
1117
1118         ne->needs_probe = 0;
1119
1120         csr1212_for_each_dir_entry(ne->csr, kv, ne->csr->root_kv, dentry) {
1121                 switch (kv->key.id) {
1122                 case CSR1212_KV_ID_VENDOR:
1123                         ne->vendor_id = kv->value.immediate;
1124                         break;
1125
1126                 case CSR1212_KV_ID_NODE_CAPABILITIES:
1127                         ne->capabilities = kv->value.immediate;
1128                         break;
1129
1130                 case CSR1212_KV_ID_UNIT:
1131                         nodemgr_process_unit_directory(hi, ne, kv, &ud_id, NULL);
1132                         break;
1133
1134                 case CSR1212_KV_ID_DESCRIPTOR:
1135                         if (last_key_id == CSR1212_KV_ID_VENDOR) {
1136                                 if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1137                                     CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1138                                     CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1139                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1140                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1141                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1142                                         csr1212_keep_keyval(kv);
1143                                         vendor_name_kv = kv;
1144                                 }
1145                         }
1146                         break;
1147                 }
1148                 last_key_id = kv->key.id;
1149         }
1150
1151         if (ne->vendor_name_kv) {
1152                 kv = ne->vendor_name_kv;
1153                 ne->vendor_name_kv = vendor_name_kv;
1154                 csr1212_release_keyval(kv);
1155         } else if (vendor_name_kv) {
1156                 ne->vendor_name_kv = vendor_name_kv;
1157                 if (device_create_file(&ne->device,
1158                                        &dev_attr_ne_vendor_name_kv) != 0)
1159                         HPSB_ERR("Failed to add sysfs attribute");
1160         }
1161 }
1162
1163 #ifdef CONFIG_HOTPLUG
1164
1165 static int nodemgr_uevent(struct device *dev, struct kobj_uevent_env *env)
1166 {
1167         struct unit_directory *ud;
1168         int retval = 0;
1169         /* ieee1394:venNmoNspNverN */
1170         char buf[8 + 1 + 3 + 8 + 2 + 8 + 2 + 8 + 3 + 8 + 1];
1171
1172         if (!dev)
1173                 return -ENODEV;
1174
1175         ud = container_of(dev, struct unit_directory, unit_dev);
1176
1177         if (ud->ne->in_limbo || ud->ignore_driver)
1178                 return -ENODEV;
1179
1180 #define PUT_ENVP(fmt,val)                                       \
1181 do {                                                            \
1182         retval = add_uevent_var(env, fmt, val);         \
1183         if (retval)                                             \
1184                 return retval;                                  \
1185 } while (0)
1186
1187         PUT_ENVP("VENDOR_ID=%06x", ud->vendor_id);
1188         PUT_ENVP("MODEL_ID=%06x", ud->model_id);
1189         PUT_ENVP("GUID=%016Lx", (unsigned long long)ud->ne->guid);
1190         PUT_ENVP("SPECIFIER_ID=%06x", ud->specifier_id);
1191         PUT_ENVP("VERSION=%06x", ud->version);
1192         snprintf(buf, sizeof(buf), "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
1193                         ud->vendor_id,
1194                         ud->model_id,
1195                         ud->specifier_id,
1196                         ud->version);
1197         PUT_ENVP("MODALIAS=%s", buf);
1198
1199 #undef PUT_ENVP
1200
1201         return 0;
1202 }
1203
1204 #else
1205
1206 static int nodemgr_uevent(struct device *dev, struct kobj_uevent_env *env)
1207 {
1208         return -ENODEV;
1209 }
1210
1211 #endif /* CONFIG_HOTPLUG */
1212
1213
1214 int __hpsb_register_protocol(struct hpsb_protocol_driver *drv,
1215                              struct module *owner)
1216 {
1217         int error;
1218
1219         drv->driver.bus = &ieee1394_bus_type;
1220         drv->driver.owner = owner;
1221         drv->driver.name = drv->name;
1222
1223         /* This will cause a probe for devices */
1224         error = driver_register(&drv->driver);
1225         if (!error)
1226                 nodemgr_create_drv_files(drv);
1227         return error;
1228 }
1229
1230 void hpsb_unregister_protocol(struct hpsb_protocol_driver *driver)
1231 {
1232         nodemgr_remove_drv_files(driver);
1233         /* This will subsequently disconnect all devices that our driver
1234          * is attached to. */
1235         driver_unregister(&driver->driver);
1236 }
1237
1238
1239 /*
1240  * This function updates nodes that were present on the bus before the
1241  * reset and still are after the reset.  The nodeid and the config rom
1242  * may have changed, and the drivers managing this device must be
1243  * informed that this device just went through a bus reset, to allow
1244  * the to take whatever actions required.
1245  */
1246 static void nodemgr_update_node(struct node_entry *ne, struct csr1212_csr *csr,
1247                                 struct host_info *hi, nodeid_t nodeid,
1248                                 unsigned int generation)
1249 {
1250         if (ne->nodeid != nodeid) {
1251                 HPSB_DEBUG("Node changed: " NODE_BUS_FMT " -> " NODE_BUS_FMT,
1252                            NODE_BUS_ARGS(ne->host, ne->nodeid),
1253                            NODE_BUS_ARGS(ne->host, nodeid));
1254                 ne->nodeid = nodeid;
1255         }
1256
1257         if (ne->busopt.generation != ((be32_to_cpu(csr->bus_info_data[2]) >> 4) & 0xf)) {
1258                 kfree(ne->csr->private);
1259                 csr1212_destroy_csr(ne->csr);
1260                 ne->csr = csr;
1261
1262                 /* If the node's configrom generation has changed, we
1263                  * unregister all the unit directories. */
1264                 nodemgr_remove_uds(ne);
1265
1266                 nodemgr_update_bus_options(ne);
1267
1268                 /* Mark the node as new, so it gets re-probed */
1269                 ne->needs_probe = 1;
1270         } else {
1271                 /* old cache is valid, so update its generation */
1272                 struct nodemgr_csr_info *ci = ne->csr->private;
1273                 ci->generation = generation;
1274                 /* free the partially filled now unneeded new cache */
1275                 kfree(csr->private);
1276                 csr1212_destroy_csr(csr);
1277         }
1278
1279         if (ne->in_limbo)
1280                 nodemgr_resume_ne(ne);
1281
1282         /* Mark the node current */
1283         ne->generation = generation;
1284 }
1285
1286
1287
1288 static void nodemgr_node_scan_one(struct host_info *hi,
1289                                   nodeid_t nodeid, int generation)
1290 {
1291         struct hpsb_host *host = hi->host;
1292         struct node_entry *ne;
1293         octlet_t guid;
1294         struct csr1212_csr *csr;
1295         struct nodemgr_csr_info *ci;
1296         u8 *speed;
1297
1298         ci = kmalloc(sizeof(*ci), GFP_KERNEL);
1299         if (!ci)
1300                 return;
1301
1302         ci->host = host;
1303         ci->nodeid = nodeid;
1304         ci->generation = generation;
1305
1306         /* Prepare for speed probe which occurs when reading the ROM */
1307         speed = &(host->speed[NODEID_TO_NODE(nodeid)]);
1308         if (*speed > host->csr.lnk_spd)
1309                 *speed = host->csr.lnk_spd;
1310         ci->speed_unverified = *speed > IEEE1394_SPEED_100;
1311
1312         /* We need to detect when the ConfigROM's generation has changed,
1313          * so we only update the node's info when it needs to be.  */
1314
1315         csr = csr1212_create_csr(&nodemgr_csr_ops, 5 * sizeof(quadlet_t), ci);
1316         if (!csr || csr1212_parse_csr(csr) != CSR1212_SUCCESS) {
1317                 HPSB_ERR("Error parsing configrom for node " NODE_BUS_FMT,
1318                          NODE_BUS_ARGS(host, nodeid));
1319                 if (csr)
1320                         csr1212_destroy_csr(csr);
1321                 kfree(ci);
1322                 return;
1323         }
1324
1325         if (csr->bus_info_data[1] != IEEE1394_BUSID_MAGIC) {
1326                 /* This isn't a 1394 device, but we let it slide. There
1327                  * was a report of a device with broken firmware which
1328                  * reported '2394' instead of '1394', which is obviously a
1329                  * mistake. One would hope that a non-1394 device never
1330                  * gets connected to Firewire bus. If someone does, we
1331                  * shouldn't be held responsible, so we'll allow it with a
1332                  * warning.  */
1333                 HPSB_WARN("Node " NODE_BUS_FMT " has invalid busID magic [0x%08x]",
1334                           NODE_BUS_ARGS(host, nodeid), csr->bus_info_data[1]);
1335         }
1336
1337         guid = ((u64)be32_to_cpu(csr->bus_info_data[3]) << 32) | be32_to_cpu(csr->bus_info_data[4]);
1338         ne = find_entry_by_guid(guid);
1339
1340         if (ne && ne->host != host && ne->in_limbo) {
1341                 /* Must have moved this device from one host to another */
1342                 nodemgr_remove_ne(ne);
1343                 ne = NULL;
1344         }
1345
1346         if (!ne)
1347                 nodemgr_create_node(guid, csr, hi, nodeid, generation);
1348         else
1349                 nodemgr_update_node(ne, csr, hi, nodeid, generation);
1350 }
1351
1352
1353 static void nodemgr_node_scan(struct host_info *hi, int generation)
1354 {
1355         int count;
1356         struct hpsb_host *host = hi->host;
1357         struct selfid *sid = (struct selfid *)host->topology_map;
1358         nodeid_t nodeid = LOCAL_BUS;
1359
1360         /* Scan each node on the bus */
1361         for (count = host->selfid_count; count; count--, sid++) {
1362                 if (sid->extended)
1363                         continue;
1364
1365                 if (!sid->link_active) {
1366                         nodeid++;
1367                         continue;
1368                 }
1369                 nodemgr_node_scan_one(hi, nodeid++, generation);
1370         }
1371 }
1372
1373
1374 static void nodemgr_suspend_ne(struct node_entry *ne)
1375 {
1376         struct device *dev;
1377         struct unit_directory *ud;
1378         struct device_driver *drv;
1379         int error;
1380
1381         HPSB_DEBUG("Node suspended: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1382                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1383
1384         ne->in_limbo = 1;
1385         WARN_ON(device_create_file(&ne->device, &dev_attr_ne_in_limbo));
1386
1387         down(&nodemgr_ud_class.sem);
1388         list_for_each_entry(dev, &nodemgr_ud_class.devices, node) {
1389                 ud = container_of(dev, struct unit_directory, unit_dev);
1390                 if (ud->ne != ne)
1391                         continue;
1392
1393                 drv = get_driver(ud->device.driver);
1394                 if (!drv)
1395                         continue;
1396
1397                 error = 1; /* release if suspend is not implemented */
1398                 if (drv->suspend) {
1399                         down(&ud->device.sem);
1400                         error = drv->suspend(&ud->device, PMSG_SUSPEND);
1401                         up(&ud->device.sem);
1402                 }
1403                 if (error)
1404                         device_release_driver(&ud->device);
1405                 put_driver(drv);
1406         }
1407         up(&nodemgr_ud_class.sem);
1408 }
1409
1410
1411 static void nodemgr_resume_ne(struct node_entry *ne)
1412 {
1413         struct device *dev;
1414         struct unit_directory *ud;
1415         struct device_driver *drv;
1416
1417         ne->in_limbo = 0;
1418         device_remove_file(&ne->device, &dev_attr_ne_in_limbo);
1419
1420         down(&nodemgr_ud_class.sem);
1421         list_for_each_entry(dev, &nodemgr_ud_class.devices, node) {
1422                 ud = container_of(dev, struct unit_directory, unit_dev);
1423                 if (ud->ne != ne)
1424                         continue;
1425
1426                 drv = get_driver(ud->device.driver);
1427                 if (!drv)
1428                         continue;
1429
1430                 if (drv->resume) {
1431                         down(&ud->device.sem);
1432                         drv->resume(&ud->device);
1433                         up(&ud->device.sem);
1434                 }
1435                 put_driver(drv);
1436         }
1437         up(&nodemgr_ud_class.sem);
1438
1439         HPSB_DEBUG("Node resumed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1440                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1441 }
1442
1443
1444 static void nodemgr_update_pdrv(struct node_entry *ne)
1445 {
1446         struct device *dev;
1447         struct unit_directory *ud;
1448         struct device_driver *drv;
1449         struct hpsb_protocol_driver *pdrv;
1450         int error;
1451
1452         down(&nodemgr_ud_class.sem);
1453         list_for_each_entry(dev, &nodemgr_ud_class.devices, node) {
1454                 ud = container_of(dev, struct unit_directory, unit_dev);
1455                 if (ud->ne != ne)
1456                         continue;
1457
1458                 drv = get_driver(ud->device.driver);
1459                 if (!drv)
1460                         continue;
1461
1462                 error = 0;
1463                 pdrv = container_of(drv, struct hpsb_protocol_driver, driver);
1464                 if (pdrv->update) {
1465                         down(&ud->device.sem);
1466                         error = pdrv->update(ud);
1467                         up(&ud->device.sem);
1468                 }
1469                 if (error)
1470                         device_release_driver(&ud->device);
1471                 put_driver(drv);
1472         }
1473         up(&nodemgr_ud_class.sem);
1474 }
1475
1476
1477 /* Write the BROADCAST_CHANNEL as per IEEE1394a 8.3.2.3.11 and 8.4.2.3.  This
1478  * seems like an optional service but in the end it is practically mandatory
1479  * as a consequence of these clauses.
1480  *
1481  * Note that we cannot do a broadcast write to all nodes at once because some
1482  * pre-1394a devices would hang. */
1483 static void nodemgr_irm_write_bc(struct node_entry *ne, int generation)
1484 {
1485         const u64 bc_addr = (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL);
1486         quadlet_t bc_remote, bc_local;
1487         int error;
1488
1489         if (!ne->host->is_irm || ne->generation != generation ||
1490             ne->nodeid == ne->host->node_id)
1491                 return;
1492
1493         bc_local = cpu_to_be32(ne->host->csr.broadcast_channel);
1494
1495         /* Check if the register is implemented and 1394a compliant. */
1496         error = hpsb_read(ne->host, ne->nodeid, generation, bc_addr, &bc_remote,
1497                           sizeof(bc_remote));
1498         if (!error && bc_remote & cpu_to_be32(0x80000000) &&
1499             bc_remote != bc_local)
1500                 hpsb_node_write(ne, bc_addr, &bc_local, sizeof(bc_local));
1501 }
1502
1503
1504 static void nodemgr_probe_ne(struct host_info *hi, struct node_entry *ne, int generation)
1505 {
1506         struct device *dev;
1507
1508         if (ne->host != hi->host || ne->in_limbo)
1509                 return;
1510
1511         dev = get_device(&ne->device);
1512         if (!dev)
1513                 return;
1514
1515         nodemgr_irm_write_bc(ne, generation);
1516
1517         /* If "needs_probe", then this is either a new or changed node we
1518          * rescan totally. If the generation matches for an existing node
1519          * (one that existed prior to the bus reset) we send update calls
1520          * down to the drivers. Otherwise, this is a dead node and we
1521          * suspend it. */
1522         if (ne->needs_probe)
1523                 nodemgr_process_root_directory(hi, ne);
1524         else if (ne->generation == generation)
1525                 nodemgr_update_pdrv(ne);
1526         else
1527                 nodemgr_suspend_ne(ne);
1528
1529         put_device(dev);
1530 }
1531
1532
1533 static void nodemgr_node_probe(struct host_info *hi, int generation)
1534 {
1535         struct hpsb_host *host = hi->host;
1536         struct device *dev;
1537         struct node_entry *ne;
1538
1539         /* Do some processing of the nodes we've probed. This pulls them
1540          * into the sysfs layer if needed, and can result in processing of
1541          * unit-directories, or just updating the node and it's
1542          * unit-directories.
1543          *
1544          * Run updates before probes. Usually, updates are time-critical
1545          * while probes are time-consuming. (Well, those probes need some
1546          * improvement...) */
1547
1548         down(&nodemgr_ne_class.sem);
1549         list_for_each_entry(dev, &nodemgr_ne_class.devices, node) {
1550                 ne = container_of(dev, struct node_entry, node_dev);
1551                 if (!ne->needs_probe)
1552                         nodemgr_probe_ne(hi, ne, generation);
1553         }
1554         list_for_each_entry(dev, &nodemgr_ne_class.devices, node) {
1555                 ne = container_of(dev, struct node_entry, node_dev);
1556                 if (ne->needs_probe)
1557                         nodemgr_probe_ne(hi, ne, generation);
1558         }
1559         up(&nodemgr_ne_class.sem);
1560
1561
1562         /* If we had a bus reset while we were scanning the bus, it is
1563          * possible that we did not probe all nodes.  In that case, we
1564          * skip the clean up for now, since we could remove nodes that
1565          * were still on the bus.  Another bus scan is pending which will
1566          * do the clean up eventually.
1567          *
1568          * Now let's tell the bus to rescan our devices. This may seem
1569          * like overhead, but the driver-model core will only scan a
1570          * device for a driver when either the device is added, or when a
1571          * new driver is added. A bus reset is a good reason to rescan
1572          * devices that were there before.  For example, an sbp2 device
1573          * may become available for login, if the host that held it was
1574          * just removed.  */
1575
1576         if (generation == get_hpsb_generation(host))
1577                 if (bus_rescan_devices(&ieee1394_bus_type))
1578                         HPSB_DEBUG("bus_rescan_devices had an error");
1579 }
1580
1581 static int nodemgr_send_resume_packet(struct hpsb_host *host)
1582 {
1583         struct hpsb_packet *packet;
1584         int error = -ENOMEM;
1585
1586         packet = hpsb_make_phypacket(host,
1587                         EXTPHYPACKET_TYPE_RESUME |
1588                         NODEID_TO_NODE(host->node_id) << PHYPACKET_PORT_SHIFT);
1589         if (packet) {
1590                 packet->no_waiter = 1;
1591                 packet->generation = get_hpsb_generation(host);
1592                 error = hpsb_send_packet(packet);
1593         }
1594         if (error)
1595                 HPSB_WARN("fw-host%d: Failed to broadcast resume packet",
1596                           host->id);
1597         return error;
1598 }
1599
1600 /* Perform a few high-level IRM responsibilities. */
1601 static int nodemgr_do_irm_duties(struct hpsb_host *host, int cycles)
1602 {
1603         quadlet_t bc;
1604
1605         /* if irm_id == -1 then there is no IRM on this bus */
1606         if (!host->is_irm || host->irm_id == (nodeid_t)-1)
1607                 return 1;
1608
1609         /* We are a 1394a-2000 compliant IRM. Set the validity bit. */
1610         host->csr.broadcast_channel |= 0x40000000;
1611
1612         /* If there is no bus manager then we should set the root node's
1613          * force_root bit to promote bus stability per the 1394
1614          * spec. (8.4.2.6) */
1615         if (host->busmgr_id == 0xffff && host->node_count > 1)
1616         {
1617                 u16 root_node = host->node_count - 1;
1618
1619                 /* get cycle master capability flag from root node */
1620                 if (host->is_cycmst ||
1621                     (!hpsb_read(host, LOCAL_BUS | root_node, get_hpsb_generation(host),
1622                                 (CSR_REGISTER_BASE + CSR_CONFIG_ROM + 2 * sizeof(quadlet_t)),
1623                                 &bc, sizeof(quadlet_t)) &&
1624                      be32_to_cpu(bc) & 1 << CSR_CMC_SHIFT))
1625                         hpsb_send_phy_config(host, root_node, -1);
1626                 else {
1627                         HPSB_DEBUG("The root node is not cycle master capable; "
1628                                    "selecting a new root node and resetting...");
1629
1630                         if (cycles >= 5) {
1631                                 /* Oh screw it! Just leave the bus as it is */
1632                                 HPSB_DEBUG("Stopping reset loop for IRM sanity");
1633                                 return 1;
1634                         }
1635
1636                         hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1637                         hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1638
1639                         return 0;
1640                 }
1641         }
1642
1643         /* Some devices suspend their ports while being connected to an inactive
1644          * host adapter, i.e. if connected before the low-level driver is
1645          * loaded.  They become visible either when physically unplugged and
1646          * replugged, or when receiving a resume packet.  Send one once. */
1647         if (!host->resume_packet_sent && !nodemgr_send_resume_packet(host))
1648                 host->resume_packet_sent = 1;
1649
1650         return 1;
1651 }
1652
1653 /* We need to ensure that if we are not the IRM, that the IRM node is capable of
1654  * everything we can do, otherwise issue a bus reset and try to become the IRM
1655  * ourselves. */
1656 static int nodemgr_check_irm_capability(struct hpsb_host *host, int cycles)
1657 {
1658         quadlet_t bc;
1659         int status;
1660
1661         if (hpsb_disable_irm || host->is_irm)
1662                 return 1;
1663
1664         status = hpsb_read(host, LOCAL_BUS | (host->irm_id),
1665                            get_hpsb_generation(host),
1666                            (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL),
1667                            &bc, sizeof(quadlet_t));
1668
1669         if (status < 0 || !(be32_to_cpu(bc) & 0x80000000)) {
1670                 /* The current irm node does not have a valid BROADCAST_CHANNEL
1671                  * register and we do, so reset the bus with force_root set */
1672                 HPSB_DEBUG("Current remote IRM is not 1394a-2000 compliant, resetting...");
1673
1674                 if (cycles >= 5) {
1675                         /* Oh screw it! Just leave the bus as it is */
1676                         HPSB_DEBUG("Stopping reset loop for IRM sanity");
1677                         return 1;
1678                 }
1679
1680                 hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1681                 hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1682
1683                 return 0;
1684         }
1685
1686         return 1;
1687 }
1688
1689 static int nodemgr_host_thread(void *__hi)
1690 {
1691         struct host_info *hi = (struct host_info *)__hi;
1692         struct hpsb_host *host = hi->host;
1693         unsigned int g, generation = 0;
1694         int i, reset_cycles = 0;
1695
1696         set_freezable();
1697         /* Setup our device-model entries */
1698         nodemgr_create_host_dev_files(host);
1699
1700         for (;;) {
1701                 /* Sleep until next bus reset */
1702                 set_current_state(TASK_INTERRUPTIBLE);
1703                 if (get_hpsb_generation(host) == generation &&
1704                     !kthread_should_stop())
1705                         schedule();
1706                 __set_current_state(TASK_RUNNING);
1707
1708                 /* Thread may have been woken up to freeze or to exit */
1709                 if (try_to_freeze())
1710                         continue;
1711                 if (kthread_should_stop())
1712                         goto exit;
1713
1714                 /* Pause for 1/4 second in 1/16 second intervals,
1715                  * to make sure things settle down. */
1716                 g = get_hpsb_generation(host);
1717                 for (i = 0; i < 4 ; i++) {
1718                         msleep_interruptible(63);
1719                         if (kthread_should_stop())
1720                                 goto exit;
1721
1722                         /* Now get the generation in which the node ID's we collect
1723                          * are valid.  During the bus scan we will use this generation
1724                          * for the read transactions, so that if another reset occurs
1725                          * during the scan the transactions will fail instead of
1726                          * returning bogus data. */
1727                         generation = get_hpsb_generation(host);
1728
1729                         /* If we get a reset before we are done waiting, then
1730                          * start the waiting over again */
1731                         if (generation != g)
1732                                 g = generation, i = 0;
1733                 }
1734
1735                 if (!nodemgr_check_irm_capability(host, reset_cycles) ||
1736                     !nodemgr_do_irm_duties(host, reset_cycles)) {
1737                         reset_cycles++;
1738                         continue;
1739                 }
1740                 reset_cycles = 0;
1741
1742                 /* Scan our nodes to get the bus options and create node
1743                  * entries. This does not do the sysfs stuff, since that
1744                  * would trigger uevents and such, which is a bad idea at
1745                  * this point. */
1746                 nodemgr_node_scan(hi, generation);
1747
1748                 /* This actually does the full probe, with sysfs
1749                  * registration. */
1750                 nodemgr_node_probe(hi, generation);
1751
1752                 /* Update some of our sysfs symlinks */
1753                 nodemgr_update_host_dev_links(host);
1754         }
1755 exit:
1756         HPSB_VERBOSE("NodeMgr: Exiting thread");
1757         return 0;
1758 }
1759
1760 /**
1761  * nodemgr_for_each_host - call a function for each IEEE 1394 host
1762  * @data: an address to supply to the callback
1763  * @cb: function to call for each host
1764  *
1765  * Iterate the hosts, calling a given function with supplied data for each host.
1766  * If the callback fails on a host, i.e. if it returns a non-zero value, the
1767  * iteration is stopped.
1768  *
1769  * Return value: 0 on success, non-zero on failure (same as returned by last run
1770  * of the callback).
1771  */
1772 int nodemgr_for_each_host(void *data, int (*cb)(struct hpsb_host *, void *))
1773 {
1774         struct device *dev;
1775         struct hpsb_host *host;
1776         int error = 0;
1777
1778         down(&hpsb_host_class.sem);
1779         list_for_each_entry(dev, &hpsb_host_class.devices, node) {
1780                 host = container_of(dev, struct hpsb_host, host_dev);
1781
1782                 if ((error = cb(host, data)))
1783                         break;
1784         }
1785         up(&hpsb_host_class.sem);
1786
1787         return error;
1788 }
1789
1790 /* The following two convenience functions use a struct node_entry
1791  * for addressing a node on the bus.  They are intended for use by any
1792  * process context, not just the nodemgr thread, so we need to be a
1793  * little careful when reading out the node ID and generation.  The
1794  * thing that can go wrong is that we get the node ID, then a bus
1795  * reset occurs, and then we read the generation.  The node ID is
1796  * possibly invalid, but the generation is current, and we end up
1797  * sending a packet to a the wrong node.
1798  *
1799  * The solution is to make sure we read the generation first, so that
1800  * if a reset occurs in the process, we end up with a stale generation
1801  * and the transactions will fail instead of silently using wrong node
1802  * ID's.
1803  */
1804
1805 /**
1806  * hpsb_node_fill_packet - fill some destination information into a packet
1807  * @ne: destination node
1808  * @packet: packet to fill in
1809  *
1810  * This will fill in the given, pre-initialised hpsb_packet with the current
1811  * information from the node entry (host, node ID, bus generation number).
1812  */
1813 void hpsb_node_fill_packet(struct node_entry *ne, struct hpsb_packet *packet)
1814 {
1815         packet->host = ne->host;
1816         packet->generation = ne->generation;
1817         barrier();
1818         packet->node_id = ne->nodeid;
1819 }
1820
1821 int hpsb_node_write(struct node_entry *ne, u64 addr,
1822                     quadlet_t *buffer, size_t length)
1823 {
1824         unsigned int generation = ne->generation;
1825
1826         barrier();
1827         return hpsb_write(ne->host, ne->nodeid, generation,
1828                           addr, buffer, length);
1829 }
1830
1831 static void nodemgr_add_host(struct hpsb_host *host)
1832 {
1833         struct host_info *hi;
1834
1835         hi = hpsb_create_hostinfo(&nodemgr_highlevel, host, sizeof(*hi));
1836         if (!hi) {
1837                 HPSB_ERR("NodeMgr: out of memory in add host");
1838                 return;
1839         }
1840         hi->host = host;
1841         hi->thread = kthread_run(nodemgr_host_thread, hi, "knodemgrd_%d",
1842                                  host->id);
1843         if (IS_ERR(hi->thread)) {
1844                 HPSB_ERR("NodeMgr: cannot start thread for host %d", host->id);
1845                 hpsb_destroy_hostinfo(&nodemgr_highlevel, host);
1846         }
1847 }
1848
1849 static void nodemgr_host_reset(struct hpsb_host *host)
1850 {
1851         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1852
1853         if (hi) {
1854                 HPSB_VERBOSE("NodeMgr: Processing reset for host %d", host->id);
1855                 wake_up_process(hi->thread);
1856         }
1857 }
1858
1859 static void nodemgr_remove_host(struct hpsb_host *host)
1860 {
1861         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1862
1863         if (hi) {
1864                 kthread_stop(hi->thread);
1865                 nodemgr_remove_host_dev(&host->device);
1866         }
1867 }
1868
1869 static struct hpsb_highlevel nodemgr_highlevel = {
1870         .name =         "Node manager",
1871         .add_host =     nodemgr_add_host,
1872         .host_reset =   nodemgr_host_reset,
1873         .remove_host =  nodemgr_remove_host,
1874 };
1875
1876 int init_ieee1394_nodemgr(void)
1877 {
1878         int error;
1879
1880         error = class_register(&nodemgr_ne_class);
1881         if (error)
1882                 goto fail_ne;
1883         error = class_register(&nodemgr_ud_class);
1884         if (error)
1885                 goto fail_ud;
1886         error = driver_register(&nodemgr_mid_layer_driver);
1887         if (error)
1888                 goto fail_ml;
1889         /* This driver is not used if nodemgr is off (disable_nodemgr=1). */
1890         nodemgr_dev_template_host.driver = &nodemgr_mid_layer_driver;
1891
1892         hpsb_register_highlevel(&nodemgr_highlevel);
1893         return 0;
1894
1895 fail_ml:
1896         class_unregister(&nodemgr_ud_class);
1897 fail_ud:
1898         class_unregister(&nodemgr_ne_class);
1899 fail_ne:
1900         return error;
1901 }
1902
1903 void cleanup_ieee1394_nodemgr(void)
1904 {
1905         hpsb_unregister_highlevel(&nodemgr_highlevel);
1906         driver_unregister(&nodemgr_mid_layer_driver);
1907         class_unregister(&nodemgr_ud_class);
1908         class_unregister(&nodemgr_ne_class);
1909 }