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