Merge commit 'v2.6.28' into core/core
[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 <linux/semaphore.h>
22 #include <asm/atomic.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 #define OUI_FREECOM_TECHNOLOGIES_GMBH 0x0001db
119
120 static int nodemgr_get_max_rom(quadlet_t *bus_info_data, void *__ci)
121 {
122         /* Freecom FireWire Hard Drive firmware bug */
123         if (be32_to_cpu(bus_info_data[3]) >> 8 == OUI_FREECOM_TECHNOLOGIES_GMBH)
124                 return 0;
125
126         return (be32_to_cpu(bus_info_data[2]) >> 8) & 0x3;
127 }
128
129 static struct csr1212_bus_ops nodemgr_csr_ops = {
130         .bus_read =     nodemgr_bus_read,
131         .get_max_rom =  nodemgr_get_max_rom
132 };
133
134
135 /*
136  * Basically what we do here is start off retrieving the bus_info block.
137  * From there will fill in some info about the node, verify it is of IEEE
138  * 1394 type, and that the crc checks out ok. After that we start off with
139  * the root directory, and subdirectories. To do this, we retrieve the
140  * quadlet header for a directory, find out the length, and retrieve the
141  * complete directory entry (be it a leaf or a directory). We then process
142  * it and add the info to our structure for that particular node.
143  *
144  * We verify CRC's along the way for each directory/block/leaf. The entire
145  * node structure is generic, and simply stores the information in a way
146  * that's easy to parse by the protocol interface.
147  */
148
149 /*
150  * The nodemgr relies heavily on the Driver Model for device callbacks and
151  * driver/device mappings. The old nodemgr used to handle all this itself,
152  * but now we are much simpler because of the LDM.
153  */
154
155 struct host_info {
156         struct hpsb_host *host;
157         struct list_head list;
158         struct task_struct *thread;
159 };
160
161 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv);
162 static int nodemgr_uevent(struct device *dev, struct kobj_uevent_env *env);
163
164 struct bus_type ieee1394_bus_type = {
165         .name           = "ieee1394",
166         .match          = nodemgr_bus_match,
167 };
168
169 static void host_cls_release(struct device *dev)
170 {
171         put_device(&container_of((dev), struct hpsb_host, host_dev)->device);
172 }
173
174 struct class hpsb_host_class = {
175         .name           = "ieee1394_host",
176         .dev_release    = host_cls_release,
177 };
178
179 static void ne_cls_release(struct device *dev)
180 {
181         put_device(&container_of((dev), struct node_entry, node_dev)->device);
182 }
183
184 static struct class nodemgr_ne_class = {
185         .name           = "ieee1394_node",
186         .dev_release    = ne_cls_release,
187 };
188
189 static void ud_cls_release(struct device *dev)
190 {
191         put_device(&container_of((dev), struct unit_directory, unit_dev)->device);
192 }
193
194 /* The name here is only so that unit directory hotplug works with old
195  * style hotplug, which only ever did unit directories anyway.
196  */
197 static struct class nodemgr_ud_class = {
198         .name           = "ieee1394",
199         .dev_release    = ud_cls_release,
200         .dev_uevent     = nodemgr_uevent,
201 };
202
203 static struct hpsb_highlevel nodemgr_highlevel;
204
205
206 static void nodemgr_release_ud(struct device *dev)
207 {
208         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
209
210         if (ud->vendor_name_kv)
211                 csr1212_release_keyval(ud->vendor_name_kv);
212         if (ud->model_name_kv)
213                 csr1212_release_keyval(ud->model_name_kv);
214
215         kfree(ud);
216 }
217
218 static void nodemgr_release_ne(struct device *dev)
219 {
220         struct node_entry *ne = container_of(dev, struct node_entry, device);
221
222         if (ne->vendor_name_kv)
223                 csr1212_release_keyval(ne->vendor_name_kv);
224
225         kfree(ne);
226 }
227
228
229 static void nodemgr_release_host(struct device *dev)
230 {
231         struct hpsb_host *host = container_of(dev, struct hpsb_host, device);
232
233         csr1212_destroy_csr(host->csr.rom);
234
235         kfree(host);
236 }
237
238 static int nodemgr_ud_platform_data;
239
240 static struct device nodemgr_dev_template_ud = {
241         .bus            = &ieee1394_bus_type,
242         .release        = nodemgr_release_ud,
243         .platform_data  = &nodemgr_ud_platform_data,
244 };
245
246 static struct device nodemgr_dev_template_ne = {
247         .bus            = &ieee1394_bus_type,
248         .release        = nodemgr_release_ne,
249 };
250
251 /* This dummy driver prevents the host devices from being scanned. We have no
252  * useful drivers for them yet, and there would be a deadlock possible if the
253  * driver core scans the host device while the host's low-level driver (i.e.
254  * the host's parent device) is being removed. */
255 static struct device_driver nodemgr_mid_layer_driver = {
256         .bus            = &ieee1394_bus_type,
257         .name           = "nodemgr",
258         .owner          = THIS_MODULE,
259 };
260
261 struct device nodemgr_dev_template_host = {
262         .bus            = &ieee1394_bus_type,
263         .release        = nodemgr_release_host,
264 };
265
266
267 #define fw_attr(class, class_type, field, type, format_string)          \
268 static ssize_t fw_show_##class##_##field (struct device *dev, struct device_attribute *attr, char *buf)\
269 {                                                                       \
270         class_type *class;                                              \
271         class = container_of(dev, class_type, device);                  \
272         return sprintf(buf, format_string, (type)class->field);         \
273 }                                                                       \
274 static struct device_attribute dev_attr_##class##_##field = {           \
275         .attr = {.name = __stringify(field), .mode = S_IRUGO },         \
276         .show   = fw_show_##class##_##field,                            \
277 };
278
279 #define fw_attr_td(class, class_type, td_kv)                            \
280 static ssize_t fw_show_##class##_##td_kv (struct device *dev, struct device_attribute *attr, char *buf)\
281 {                                                                       \
282         int len;                                                        \
283         class_type *class = container_of(dev, class_type, device);      \
284         len = (class->td_kv->value.leaf.len - 2) * sizeof(quadlet_t);   \
285         memcpy(buf,                                                     \
286                CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(class->td_kv),      \
287                len);                                                    \
288         while (buf[len - 1] == '\0')                                    \
289                 len--;                                                  \
290         buf[len++] = '\n';                                              \
291         buf[len] = '\0';                                                \
292         return len;                                                     \
293 }                                                                       \
294 static struct device_attribute dev_attr_##class##_##td_kv = {           \
295         .attr = {.name = __stringify(td_kv), .mode = S_IRUGO },         \
296         .show   = fw_show_##class##_##td_kv,                            \
297 };
298
299
300 #define fw_drv_attr(field, type, format_string)                 \
301 static ssize_t fw_drv_show_##field (struct device_driver *drv, char *buf) \
302 {                                                               \
303         struct hpsb_protocol_driver *driver;                    \
304         driver = container_of(drv, struct hpsb_protocol_driver, driver); \
305         return sprintf(buf, format_string, (type)driver->field);\
306 }                                                               \
307 static struct driver_attribute driver_attr_drv_##field = {      \
308         .attr = {.name = __stringify(field), .mode = S_IRUGO }, \
309         .show   = fw_drv_show_##field,                          \
310 };
311
312
313 static ssize_t fw_show_ne_bus_options(struct device *dev, struct device_attribute *attr, char *buf)
314 {
315         struct node_entry *ne = container_of(dev, struct node_entry, device);
316
317         return sprintf(buf, "IRMC(%d) CMC(%d) ISC(%d) BMC(%d) PMC(%d) GEN(%d) "
318                        "LSPD(%d) MAX_REC(%d) MAX_ROM(%d) CYC_CLK_ACC(%d)\n",
319                        ne->busopt.irmc,
320                        ne->busopt.cmc, ne->busopt.isc, ne->busopt.bmc,
321                        ne->busopt.pmc, ne->busopt.generation, ne->busopt.lnkspd,
322                        ne->busopt.max_rec,
323                        ne->busopt.max_rom,
324                        ne->busopt.cyc_clk_acc);
325 }
326 static DEVICE_ATTR(bus_options,S_IRUGO,fw_show_ne_bus_options,NULL);
327
328
329 #ifdef HPSB_DEBUG_TLABELS
330 static ssize_t fw_show_ne_tlabels_free(struct device *dev,
331                                        struct device_attribute *attr, char *buf)
332 {
333         struct node_entry *ne = container_of(dev, struct node_entry, device);
334         unsigned long flags;
335         unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
336         int tf;
337
338         spin_lock_irqsave(&hpsb_tlabel_lock, flags);
339         tf = 64 - bitmap_weight(tp, 64);
340         spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
341
342         return sprintf(buf, "%d\n", tf);
343 }
344 static DEVICE_ATTR(tlabels_free,S_IRUGO,fw_show_ne_tlabels_free,NULL);
345
346
347 static ssize_t fw_show_ne_tlabels_mask(struct device *dev,
348                                        struct device_attribute *attr, char *buf)
349 {
350         struct node_entry *ne = container_of(dev, struct node_entry, device);
351         unsigned long flags;
352         unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
353         u64 tm;
354
355         spin_lock_irqsave(&hpsb_tlabel_lock, flags);
356 #if (BITS_PER_LONG <= 32)
357         tm = ((u64)tp[0] << 32) + tp[1];
358 #else
359         tm = tp[0];
360 #endif
361         spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
362
363         return sprintf(buf, "0x%016llx\n", (unsigned long long)tm);
364 }
365 static DEVICE_ATTR(tlabels_mask, S_IRUGO, fw_show_ne_tlabels_mask, NULL);
366 #endif /* HPSB_DEBUG_TLABELS */
367
368
369 static ssize_t fw_set_ignore_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
370 {
371         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
372         int state = simple_strtoul(buf, NULL, 10);
373
374         if (state == 1) {
375                 ud->ignore_driver = 1;
376                 device_release_driver(dev);
377         } else if (state == 0)
378                 ud->ignore_driver = 0;
379
380         return count;
381 }
382 static ssize_t fw_get_ignore_driver(struct device *dev, struct device_attribute *attr, char *buf)
383 {
384         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
385
386         return sprintf(buf, "%d\n", ud->ignore_driver);
387 }
388 static DEVICE_ATTR(ignore_driver, S_IWUSR | S_IRUGO, fw_get_ignore_driver, fw_set_ignore_driver);
389
390
391 static ssize_t fw_set_rescan(struct bus_type *bus, const char *buf,
392                              size_t count)
393 {
394         int error = 0;
395
396         if (simple_strtoul(buf, NULL, 10) == 1)
397                 error = bus_rescan_devices(&ieee1394_bus_type);
398         return error ? error : count;
399 }
400 static ssize_t fw_get_rescan(struct bus_type *bus, char *buf)
401 {
402         return sprintf(buf, "You can force a rescan of the bus for "
403                         "drivers by writing a 1 to this file\n");
404 }
405 static BUS_ATTR(rescan, S_IWUSR | S_IRUGO, fw_get_rescan, fw_set_rescan);
406
407
408 static ssize_t fw_set_ignore_drivers(struct bus_type *bus, const char *buf, size_t count)
409 {
410         int state = simple_strtoul(buf, NULL, 10);
411
412         if (state == 1)
413                 ignore_drivers = 1;
414         else if (state == 0)
415                 ignore_drivers = 0;
416
417         return count;
418 }
419 static ssize_t fw_get_ignore_drivers(struct bus_type *bus, char *buf)
420 {
421         return sprintf(buf, "%d\n", ignore_drivers);
422 }
423 static BUS_ATTR(ignore_drivers, S_IWUSR | S_IRUGO, fw_get_ignore_drivers, fw_set_ignore_drivers);
424
425
426 struct bus_attribute *const fw_bus_attrs[] = {
427         &bus_attr_rescan,
428         &bus_attr_ignore_drivers,
429         NULL
430 };
431
432
433 fw_attr(ne, struct node_entry, capabilities, unsigned int, "0x%06x\n")
434 fw_attr(ne, struct node_entry, nodeid, unsigned int, "0x%04x\n")
435
436 fw_attr(ne, struct node_entry, vendor_id, unsigned int, "0x%06x\n")
437 fw_attr_td(ne, struct node_entry, vendor_name_kv)
438
439 fw_attr(ne, struct node_entry, guid, unsigned long long, "0x%016Lx\n")
440 fw_attr(ne, struct node_entry, guid_vendor_id, unsigned int, "0x%06x\n")
441 fw_attr(ne, struct node_entry, in_limbo, int, "%d\n");
442
443 static struct device_attribute *const fw_ne_attrs[] = {
444         &dev_attr_ne_guid,
445         &dev_attr_ne_guid_vendor_id,
446         &dev_attr_ne_capabilities,
447         &dev_attr_ne_vendor_id,
448         &dev_attr_ne_nodeid,
449         &dev_attr_bus_options,
450 #ifdef HPSB_DEBUG_TLABELS
451         &dev_attr_tlabels_free,
452         &dev_attr_tlabels_mask,
453 #endif
454 };
455
456
457
458 fw_attr(ud, struct unit_directory, address, unsigned long long, "0x%016Lx\n")
459 fw_attr(ud, struct unit_directory, length, int, "%d\n")
460 /* These are all dependent on the value being provided */
461 fw_attr(ud, struct unit_directory, vendor_id, unsigned int, "0x%06x\n")
462 fw_attr(ud, struct unit_directory, model_id, unsigned int, "0x%06x\n")
463 fw_attr(ud, struct unit_directory, specifier_id, unsigned int, "0x%06x\n")
464 fw_attr(ud, struct unit_directory, version, unsigned int, "0x%06x\n")
465 fw_attr_td(ud, struct unit_directory, vendor_name_kv)
466 fw_attr_td(ud, struct unit_directory, model_name_kv)
467
468 static struct device_attribute *const fw_ud_attrs[] = {
469         &dev_attr_ud_address,
470         &dev_attr_ud_length,
471         &dev_attr_ignore_driver,
472 };
473
474
475 fw_attr(host, struct hpsb_host, node_count, int, "%d\n")
476 fw_attr(host, struct hpsb_host, selfid_count, int, "%d\n")
477 fw_attr(host, struct hpsb_host, nodes_active, int, "%d\n")
478 fw_attr(host, struct hpsb_host, in_bus_reset, int, "%d\n")
479 fw_attr(host, struct hpsb_host, is_root, int, "%d\n")
480 fw_attr(host, struct hpsb_host, is_cycmst, int, "%d\n")
481 fw_attr(host, struct hpsb_host, is_irm, int, "%d\n")
482 fw_attr(host, struct hpsb_host, is_busmgr, int, "%d\n")
483
484 static struct device_attribute *const fw_host_attrs[] = {
485         &dev_attr_host_node_count,
486         &dev_attr_host_selfid_count,
487         &dev_attr_host_nodes_active,
488         &dev_attr_host_in_bus_reset,
489         &dev_attr_host_is_root,
490         &dev_attr_host_is_cycmst,
491         &dev_attr_host_is_irm,
492         &dev_attr_host_is_busmgr,
493 };
494
495
496 static ssize_t fw_show_drv_device_ids(struct device_driver *drv, char *buf)
497 {
498         struct hpsb_protocol_driver *driver;
499         struct ieee1394_device_id *id;
500         int length = 0;
501         char *scratch = buf;
502
503         driver = container_of(drv, struct hpsb_protocol_driver, driver);
504         id = driver->id_table;
505         if (!id)
506                 return 0;
507
508         for (; id->match_flags != 0; id++) {
509                 int need_coma = 0;
510
511                 if (id->match_flags & IEEE1394_MATCH_VENDOR_ID) {
512                         length += sprintf(scratch, "vendor_id=0x%06x", id->vendor_id);
513                         scratch = buf + length;
514                         need_coma++;
515                 }
516
517                 if (id->match_flags & IEEE1394_MATCH_MODEL_ID) {
518                         length += sprintf(scratch, "%smodel_id=0x%06x",
519                                           need_coma++ ? "," : "",
520                                           id->model_id);
521                         scratch = buf + length;
522                 }
523
524                 if (id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) {
525                         length += sprintf(scratch, "%sspecifier_id=0x%06x",
526                                           need_coma++ ? "," : "",
527                                           id->specifier_id);
528                         scratch = buf + length;
529                 }
530
531                 if (id->match_flags & IEEE1394_MATCH_VERSION) {
532                         length += sprintf(scratch, "%sversion=0x%06x",
533                                           need_coma++ ? "," : "",
534                                           id->version);
535                         scratch = buf + length;
536                 }
537
538                 if (need_coma) {
539                         *scratch++ = '\n';
540                         length++;
541                 }
542         }
543
544         return length;
545 }
546 static DRIVER_ATTR(device_ids,S_IRUGO,fw_show_drv_device_ids,NULL);
547
548
549 fw_drv_attr(name, const char *, "%s\n")
550
551 static struct driver_attribute *const fw_drv_attrs[] = {
552         &driver_attr_drv_name,
553         &driver_attr_device_ids,
554 };
555
556
557 static void nodemgr_create_drv_files(struct hpsb_protocol_driver *driver)
558 {
559         struct device_driver *drv = &driver->driver;
560         int i;
561
562         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
563                 if (driver_create_file(drv, fw_drv_attrs[i]))
564                         goto fail;
565         return;
566 fail:
567         HPSB_ERR("Failed to add sysfs attribute");
568 }
569
570
571 static void nodemgr_remove_drv_files(struct hpsb_protocol_driver *driver)
572 {
573         struct device_driver *drv = &driver->driver;
574         int i;
575
576         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
577                 driver_remove_file(drv, fw_drv_attrs[i]);
578 }
579
580
581 static void nodemgr_create_ne_dev_files(struct node_entry *ne)
582 {
583         struct device *dev = &ne->device;
584         int i;
585
586         for (i = 0; i < ARRAY_SIZE(fw_ne_attrs); i++)
587                 if (device_create_file(dev, fw_ne_attrs[i]))
588                         goto fail;
589         return;
590 fail:
591         HPSB_ERR("Failed to add sysfs attribute");
592 }
593
594
595 static void nodemgr_create_host_dev_files(struct hpsb_host *host)
596 {
597         struct device *dev = &host->device;
598         int i;
599
600         for (i = 0; i < ARRAY_SIZE(fw_host_attrs); i++)
601                 if (device_create_file(dev, fw_host_attrs[i]))
602                         goto fail;
603         return;
604 fail:
605         HPSB_ERR("Failed to add sysfs attribute");
606 }
607
608
609 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
610                                                nodeid_t nodeid);
611
612 static void nodemgr_update_host_dev_links(struct hpsb_host *host)
613 {
614         struct device *dev = &host->device;
615         struct node_entry *ne;
616
617         sysfs_remove_link(&dev->kobj, "irm_id");
618         sysfs_remove_link(&dev->kobj, "busmgr_id");
619         sysfs_remove_link(&dev->kobj, "host_id");
620
621         if ((ne = find_entry_by_nodeid(host, host->irm_id)) &&
622             sysfs_create_link(&dev->kobj, &ne->device.kobj, "irm_id"))
623                 goto fail;
624         if ((ne = find_entry_by_nodeid(host, host->busmgr_id)) &&
625             sysfs_create_link(&dev->kobj, &ne->device.kobj, "busmgr_id"))
626                 goto fail;
627         if ((ne = find_entry_by_nodeid(host, host->node_id)) &&
628             sysfs_create_link(&dev->kobj, &ne->device.kobj, "host_id"))
629                 goto fail;
630         return;
631 fail:
632         HPSB_ERR("Failed to update sysfs attributes for host %d", host->id);
633 }
634
635 static void nodemgr_create_ud_dev_files(struct unit_directory *ud)
636 {
637         struct device *dev = &ud->device;
638         int i;
639
640         for (i = 0; i < ARRAY_SIZE(fw_ud_attrs); i++)
641                 if (device_create_file(dev, fw_ud_attrs[i]))
642                         goto fail;
643         if (ud->flags & UNIT_DIRECTORY_SPECIFIER_ID)
644                 if (device_create_file(dev, &dev_attr_ud_specifier_id))
645                         goto fail;
646         if (ud->flags & UNIT_DIRECTORY_VERSION)
647                 if (device_create_file(dev, &dev_attr_ud_version))
648                         goto fail;
649         if (ud->flags & UNIT_DIRECTORY_VENDOR_ID) {
650                 if (device_create_file(dev, &dev_attr_ud_vendor_id))
651                         goto fail;
652                 if (ud->vendor_name_kv &&
653                     device_create_file(dev, &dev_attr_ud_vendor_name_kv))
654                         goto fail;
655         }
656         if (ud->flags & UNIT_DIRECTORY_MODEL_ID) {
657                 if (device_create_file(dev, &dev_attr_ud_model_id))
658                         goto fail;
659                 if (ud->model_name_kv &&
660                     device_create_file(dev, &dev_attr_ud_model_name_kv))
661                         goto fail;
662         }
663         return;
664 fail:
665         HPSB_ERR("Failed to add sysfs attribute");
666 }
667
668
669 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv)
670 {
671         struct hpsb_protocol_driver *driver;
672         struct unit_directory *ud;
673         struct ieee1394_device_id *id;
674
675         /* We only match unit directories */
676         if (dev->platform_data != &nodemgr_ud_platform_data)
677                 return 0;
678
679         ud = container_of(dev, struct unit_directory, device);
680         if (ud->ne->in_limbo || ud->ignore_driver)
681                 return 0;
682
683         /* We only match drivers of type hpsb_protocol_driver */
684         if (drv == &nodemgr_mid_layer_driver)
685                 return 0;
686
687         driver = container_of(drv, struct hpsb_protocol_driver, driver);
688         id = driver->id_table;
689         if (!id)
690                 return 0;
691
692         for (; id->match_flags != 0; id++) {
693                 if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) &&
694                     id->vendor_id != ud->vendor_id)
695                         continue;
696
697                 if ((id->match_flags & IEEE1394_MATCH_MODEL_ID) &&
698                     id->model_id != ud->model_id)
699                         continue;
700
701                 if ((id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) &&
702                     id->specifier_id != ud->specifier_id)
703                         continue;
704
705                 if ((id->match_flags & IEEE1394_MATCH_VERSION) &&
706                     id->version != ud->version)
707                         continue;
708
709                 return 1;
710         }
711
712         return 0;
713 }
714
715
716 static DEFINE_MUTEX(nodemgr_serialize_remove_uds);
717
718 static int match_ne(struct device *dev, void *data)
719 {
720         struct unit_directory *ud;
721         struct node_entry *ne = data;
722
723         ud = container_of(dev, struct unit_directory, unit_dev);
724         return ud->ne == ne;
725 }
726
727 static void nodemgr_remove_uds(struct node_entry *ne)
728 {
729         struct device *dev;
730         struct unit_directory *ud;
731
732         /* Use class_find device to iterate the devices. Since this code
733          * may be called from other contexts besides the knodemgrds,
734          * protect it by nodemgr_serialize_remove_uds.
735          */
736         mutex_lock(&nodemgr_serialize_remove_uds);
737         for (;;) {
738                 dev = class_find_device(&nodemgr_ud_class, NULL, ne, match_ne);
739                 if (!dev)
740                         break;
741                 ud = container_of(dev, struct unit_directory, unit_dev);
742                 put_device(dev);
743                 device_unregister(&ud->unit_dev);
744                 device_unregister(&ud->device);
745         }
746         mutex_unlock(&nodemgr_serialize_remove_uds);
747 }
748
749
750 static void nodemgr_remove_ne(struct node_entry *ne)
751 {
752         struct device *dev;
753
754         dev = get_device(&ne->device);
755         if (!dev)
756                 return;
757
758         HPSB_DEBUG("Node removed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
759                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
760         nodemgr_remove_uds(ne);
761
762         device_unregister(&ne->node_dev);
763         device_unregister(dev);
764
765         put_device(dev);
766 }
767
768 static int remove_host_dev(struct device *dev, void *data)
769 {
770         if (dev->bus == &ieee1394_bus_type)
771                 nodemgr_remove_ne(container_of(dev, struct node_entry,
772                                   device));
773         return 0;
774 }
775
776 static void nodemgr_remove_host_dev(struct device *dev)
777 {
778         device_for_each_child(dev, NULL, remove_host_dev);
779         sysfs_remove_link(&dev->kobj, "irm_id");
780         sysfs_remove_link(&dev->kobj, "busmgr_id");
781         sysfs_remove_link(&dev->kobj, "host_id");
782 }
783
784
785 static void nodemgr_update_bus_options(struct node_entry *ne)
786 {
787 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
788         static const u16 mr[] = { 4, 64, 1024, 0};
789 #endif
790         quadlet_t busoptions = be32_to_cpu(ne->csr->bus_info_data[2]);
791
792         ne->busopt.irmc         = (busoptions >> 31) & 1;
793         ne->busopt.cmc          = (busoptions >> 30) & 1;
794         ne->busopt.isc          = (busoptions >> 29) & 1;
795         ne->busopt.bmc          = (busoptions >> 28) & 1;
796         ne->busopt.pmc          = (busoptions >> 27) & 1;
797         ne->busopt.cyc_clk_acc  = (busoptions >> 16) & 0xff;
798         ne->busopt.max_rec      = 1 << (((busoptions >> 12) & 0xf) + 1);
799         ne->busopt.max_rom      = (busoptions >> 8) & 0x3;
800         ne->busopt.generation   = (busoptions >> 4) & 0xf;
801         ne->busopt.lnkspd       = busoptions & 0x7;
802
803         HPSB_VERBOSE("NodeMgr: raw=0x%08x irmc=%d cmc=%d isc=%d bmc=%d pmc=%d "
804                      "cyc_clk_acc=%d max_rec=%d max_rom=%d gen=%d lspd=%d",
805                      busoptions, ne->busopt.irmc, ne->busopt.cmc,
806                      ne->busopt.isc, ne->busopt.bmc, ne->busopt.pmc,
807                      ne->busopt.cyc_clk_acc, ne->busopt.max_rec,
808                      mr[ne->busopt.max_rom],
809                      ne->busopt.generation, ne->busopt.lnkspd);
810 }
811
812
813 static struct node_entry *nodemgr_create_node(octlet_t guid,
814                                 struct csr1212_csr *csr, struct hpsb_host *host,
815                                 nodeid_t nodeid, unsigned int generation)
816 {
817         struct node_entry *ne;
818
819         ne = kzalloc(sizeof(*ne), GFP_KERNEL);
820         if (!ne)
821                 goto fail_alloc;
822
823         ne->host = host;
824         ne->nodeid = nodeid;
825         ne->generation = generation;
826         ne->needs_probe = true;
827
828         ne->guid = guid;
829         ne->guid_vendor_id = (guid >> 40) & 0xffffff;
830         ne->csr = csr;
831
832         memcpy(&ne->device, &nodemgr_dev_template_ne,
833                sizeof(ne->device));
834         ne->device.parent = &host->device;
835         dev_set_name(&ne->device, "%016Lx", (unsigned long long)(ne->guid));
836
837         ne->node_dev.parent = &ne->device;
838         ne->node_dev.class = &nodemgr_ne_class;
839         dev_set_name(&ne->node_dev, "%016Lx", (unsigned long long)(ne->guid));
840
841         if (device_register(&ne->device))
842                 goto fail_devreg;
843         if (device_register(&ne->node_dev))
844                 goto fail_classdevreg;
845         get_device(&ne->device);
846
847         nodemgr_create_ne_dev_files(ne);
848
849         nodemgr_update_bus_options(ne);
850
851         HPSB_DEBUG("%s added: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
852                    (host->node_id == nodeid) ? "Host" : "Node",
853                    NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
854
855         return ne;
856
857 fail_classdevreg:
858         device_unregister(&ne->device);
859 fail_devreg:
860         kfree(ne);
861 fail_alloc:
862         HPSB_ERR("Failed to create node ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
863                  NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
864
865         return NULL;
866 }
867
868 static int match_ne_guid(struct device *dev, void *data)
869 {
870         struct node_entry *ne;
871         u64 *guid = data;
872
873         ne = container_of(dev, struct node_entry, node_dev);
874         return ne->guid == *guid;
875 }
876
877 static struct node_entry *find_entry_by_guid(u64 guid)
878 {
879         struct device *dev;
880         struct node_entry *ne;
881
882         dev = class_find_device(&nodemgr_ne_class, NULL, &guid, match_ne_guid);
883         if (!dev)
884                 return NULL;
885         ne = container_of(dev, struct node_entry, node_dev);
886         put_device(dev);
887
888         return ne;
889 }
890
891 struct match_nodeid_parameter {
892         struct hpsb_host *host;
893         nodeid_t nodeid;
894 };
895
896 static int match_ne_nodeid(struct device *dev, void *data)
897 {
898         int found = 0;
899         struct node_entry *ne;
900         struct match_nodeid_parameter *p = data;
901
902         if (!dev)
903                 goto ret;
904         ne = container_of(dev, struct node_entry, node_dev);
905         if (ne->host == p->host && ne->nodeid == p->nodeid)
906                 found = 1;
907 ret:
908         return found;
909 }
910
911 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
912                                                nodeid_t nodeid)
913 {
914         struct device *dev;
915         struct node_entry *ne;
916         struct match_nodeid_parameter p;
917
918         p.host = host;
919         p.nodeid = nodeid;
920
921         dev = class_find_device(&nodemgr_ne_class, NULL, &p, match_ne_nodeid);
922         if (!dev)
923                 return NULL;
924         ne = container_of(dev, struct node_entry, node_dev);
925         put_device(dev);
926
927         return ne;
928 }
929
930
931 static void nodemgr_register_device(struct node_entry *ne, 
932         struct unit_directory *ud, struct device *parent)
933 {
934         memcpy(&ud->device, &nodemgr_dev_template_ud,
935                sizeof(ud->device));
936
937         ud->device.parent = parent;
938
939         dev_set_name(&ud->device, "%s-%u", dev_name(&ne->device), ud->id);
940
941         ud->unit_dev.parent = &ud->device;
942         ud->unit_dev.class = &nodemgr_ud_class;
943         dev_set_name(&ud->unit_dev, "%s-%u", dev_name(&ne->device), ud->id);
944
945         if (device_register(&ud->device))
946                 goto fail_devreg;
947         if (device_register(&ud->unit_dev))
948                 goto fail_classdevreg;
949         get_device(&ud->device);
950
951         nodemgr_create_ud_dev_files(ud);
952
953         return;
954
955 fail_classdevreg:
956         device_unregister(&ud->device);
957 fail_devreg:
958         HPSB_ERR("Failed to create unit %s", dev_name(&ud->device));
959 }       
960
961
962 /* This implementation currently only scans the config rom and its
963  * immediate unit directories looking for software_id and
964  * software_version entries, in order to get driver autoloading working. */
965 static struct unit_directory *nodemgr_process_unit_directory
966         (struct node_entry *ne, struct csr1212_keyval *ud_kv,
967          unsigned int *id, struct unit_directory *parent)
968 {
969         struct unit_directory *ud;
970         struct unit_directory *ud_child = NULL;
971         struct csr1212_dentry *dentry;
972         struct csr1212_keyval *kv;
973         u8 last_key_id = 0;
974
975         ud = kzalloc(sizeof(*ud), GFP_KERNEL);
976         if (!ud)
977                 goto unit_directory_error;
978
979         ud->ne = ne;
980         ud->ignore_driver = ignore_drivers;
981         ud->address = ud_kv->offset + CSR1212_REGISTER_SPACE_BASE;
982         ud->directory_id = ud->address & 0xffffff;
983         ud->ud_kv = ud_kv;
984         ud->id = (*id)++;
985
986         csr1212_for_each_dir_entry(ne->csr, kv, ud_kv, dentry) {
987                 switch (kv->key.id) {
988                 case CSR1212_KV_ID_VENDOR:
989                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
990                                 ud->vendor_id = kv->value.immediate;
991                                 ud->flags |= UNIT_DIRECTORY_VENDOR_ID;
992                         }
993                         break;
994
995                 case CSR1212_KV_ID_MODEL:
996                         ud->model_id = kv->value.immediate;
997                         ud->flags |= UNIT_DIRECTORY_MODEL_ID;
998                         break;
999
1000                 case CSR1212_KV_ID_SPECIFIER_ID:
1001                         ud->specifier_id = kv->value.immediate;
1002                         ud->flags |= UNIT_DIRECTORY_SPECIFIER_ID;
1003                         break;
1004
1005                 case CSR1212_KV_ID_VERSION:
1006                         ud->version = kv->value.immediate;
1007                         ud->flags |= UNIT_DIRECTORY_VERSION;
1008                         break;
1009
1010                 case CSR1212_KV_ID_DESCRIPTOR:
1011                         if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1012                             CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1013                             CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1014                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1015                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1016                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1017                                 switch (last_key_id) {
1018                                 case CSR1212_KV_ID_VENDOR:
1019                                         csr1212_keep_keyval(kv);
1020                                         ud->vendor_name_kv = kv;
1021                                         break;
1022
1023                                 case CSR1212_KV_ID_MODEL:
1024                                         csr1212_keep_keyval(kv);
1025                                         ud->model_name_kv = kv;
1026                                         break;
1027
1028                                 }
1029                         } /* else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) ... */
1030                         break;
1031
1032                 case CSR1212_KV_ID_DEPENDENT_INFO:
1033                         /* Logical Unit Number */
1034                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
1035                                 if (ud->flags & UNIT_DIRECTORY_HAS_LUN) {
1036                                         ud_child = kmemdup(ud, sizeof(*ud_child), GFP_KERNEL);
1037                                         if (!ud_child)
1038                                                 goto unit_directory_error;
1039                                         nodemgr_register_device(ne, ud_child, &ne->device);
1040                                         ud_child = NULL;
1041                                         
1042                                         ud->id = (*id)++;
1043                                 }
1044                                 ud->lun = kv->value.immediate;
1045                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN;
1046
1047                         /* Logical Unit Directory */
1048                         } else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) {
1049                                 /* This should really be done in SBP2 as this is
1050                                  * doing SBP2 specific parsing.
1051                                  */
1052                                 
1053                                 /* first register the parent unit */
1054                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN_DIRECTORY;
1055                                 if (ud->device.bus != &ieee1394_bus_type)
1056                                         nodemgr_register_device(ne, ud, &ne->device);
1057                                 
1058                                 /* process the child unit */
1059                                 ud_child = nodemgr_process_unit_directory(ne, kv, id, ud);
1060
1061                                 if (ud_child == NULL)
1062                                         break;
1063                                 
1064                                 /* inherit unspecified values, the driver core picks it up */
1065                                 if ((ud->flags & UNIT_DIRECTORY_MODEL_ID) &&
1066                                     !(ud_child->flags & UNIT_DIRECTORY_MODEL_ID))
1067                                 {
1068                                         ud_child->flags |=  UNIT_DIRECTORY_MODEL_ID;
1069                                         ud_child->model_id = ud->model_id;
1070                                 }
1071                                 if ((ud->flags & UNIT_DIRECTORY_SPECIFIER_ID) &&
1072                                     !(ud_child->flags & UNIT_DIRECTORY_SPECIFIER_ID))
1073                                 {
1074                                         ud_child->flags |=  UNIT_DIRECTORY_SPECIFIER_ID;
1075                                         ud_child->specifier_id = ud->specifier_id;
1076                                 }
1077                                 if ((ud->flags & UNIT_DIRECTORY_VERSION) &&
1078                                     !(ud_child->flags & UNIT_DIRECTORY_VERSION))
1079                                 {
1080                                         ud_child->flags |=  UNIT_DIRECTORY_VERSION;
1081                                         ud_child->version = ud->version;
1082                                 }
1083                                 
1084                                 /* register the child unit */
1085                                 ud_child->flags |= UNIT_DIRECTORY_LUN_DIRECTORY;
1086                                 nodemgr_register_device(ne, ud_child, &ud->device);
1087                         }
1088
1089                         break;
1090
1091                 case CSR1212_KV_ID_DIRECTORY_ID:
1092                         ud->directory_id = kv->value.immediate;
1093                         break;
1094
1095                 default:
1096                         break;
1097                 }
1098                 last_key_id = kv->key.id;
1099         }
1100         
1101         /* do not process child units here and only if not already registered */
1102         if (!parent && ud->device.bus != &ieee1394_bus_type)
1103                 nodemgr_register_device(ne, ud, &ne->device);
1104
1105         return ud;
1106
1107 unit_directory_error:
1108         kfree(ud);
1109         return NULL;
1110 }
1111
1112
1113 static void nodemgr_process_root_directory(struct node_entry *ne)
1114 {
1115         unsigned int ud_id = 0;
1116         struct csr1212_dentry *dentry;
1117         struct csr1212_keyval *kv, *vendor_name_kv = NULL;
1118         u8 last_key_id = 0;
1119
1120         ne->needs_probe = false;
1121
1122         csr1212_for_each_dir_entry(ne->csr, kv, ne->csr->root_kv, dentry) {
1123                 switch (kv->key.id) {
1124                 case CSR1212_KV_ID_VENDOR:
1125                         ne->vendor_id = kv->value.immediate;
1126                         break;
1127
1128                 case CSR1212_KV_ID_NODE_CAPABILITIES:
1129                         ne->capabilities = kv->value.immediate;
1130                         break;
1131
1132                 case CSR1212_KV_ID_UNIT:
1133                         nodemgr_process_unit_directory(ne, kv, &ud_id, NULL);
1134                         break;
1135
1136                 case CSR1212_KV_ID_DESCRIPTOR:
1137                         if (last_key_id == CSR1212_KV_ID_VENDOR) {
1138                                 if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1139                                     CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1140                                     CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1141                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1142                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1143                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1144                                         csr1212_keep_keyval(kv);
1145                                         vendor_name_kv = kv;
1146                                 }
1147                         }
1148                         break;
1149                 }
1150                 last_key_id = kv->key.id;
1151         }
1152
1153         if (ne->vendor_name_kv) {
1154                 kv = ne->vendor_name_kv;
1155                 ne->vendor_name_kv = vendor_name_kv;
1156                 csr1212_release_keyval(kv);
1157         } else if (vendor_name_kv) {
1158                 ne->vendor_name_kv = vendor_name_kv;
1159                 if (device_create_file(&ne->device,
1160                                        &dev_attr_ne_vendor_name_kv) != 0)
1161                         HPSB_ERR("Failed to add sysfs attribute");
1162         }
1163 }
1164
1165 #ifdef CONFIG_HOTPLUG
1166
1167 static int nodemgr_uevent(struct device *dev, struct kobj_uevent_env *env)
1168 {
1169         struct unit_directory *ud;
1170         int retval = 0;
1171         /* ieee1394:venNmoNspNverN */
1172         char buf[8 + 1 + 3 + 8 + 2 + 8 + 2 + 8 + 3 + 8 + 1];
1173
1174         if (!dev)
1175                 return -ENODEV;
1176
1177         ud = container_of(dev, struct unit_directory, unit_dev);
1178
1179         if (ud->ne->in_limbo || ud->ignore_driver)
1180                 return -ENODEV;
1181
1182 #define PUT_ENVP(fmt,val)                                       \
1183 do {                                                            \
1184         retval = add_uevent_var(env, 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         return 0;
1204 }
1205
1206 #else
1207
1208 static int nodemgr_uevent(struct device *dev, struct kobj_uevent_env *env)
1209 {
1210         return -ENODEV;
1211 }
1212
1213 #endif /* CONFIG_HOTPLUG */
1214
1215
1216 int __hpsb_register_protocol(struct hpsb_protocol_driver *drv,
1217                              struct module *owner)
1218 {
1219         int error;
1220
1221         drv->driver.bus = &ieee1394_bus_type;
1222         drv->driver.owner = owner;
1223         drv->driver.name = drv->name;
1224
1225         /* This will cause a probe for devices */
1226         error = driver_register(&drv->driver);
1227         if (!error)
1228                 nodemgr_create_drv_files(drv);
1229         return error;
1230 }
1231
1232 void hpsb_unregister_protocol(struct hpsb_protocol_driver *driver)
1233 {
1234         nodemgr_remove_drv_files(driver);
1235         /* This will subsequently disconnect all devices that our driver
1236          * is attached to. */
1237         driver_unregister(&driver->driver);
1238 }
1239
1240
1241 /*
1242  * This function updates nodes that were present on the bus before the
1243  * reset and still are after the reset.  The nodeid and the config rom
1244  * may have changed, and the drivers managing this device must be
1245  * informed that this device just went through a bus reset, to allow
1246  * the to take whatever actions required.
1247  */
1248 static void nodemgr_update_node(struct node_entry *ne, struct csr1212_csr *csr,
1249                                 nodeid_t nodeid, unsigned int generation)
1250 {
1251         if (ne->nodeid != nodeid) {
1252                 HPSB_DEBUG("Node changed: " NODE_BUS_FMT " -> " NODE_BUS_FMT,
1253                            NODE_BUS_ARGS(ne->host, ne->nodeid),
1254                            NODE_BUS_ARGS(ne->host, nodeid));
1255                 ne->nodeid = nodeid;
1256         }
1257
1258         if (ne->busopt.generation != ((be32_to_cpu(csr->bus_info_data[2]) >> 4) & 0xf)) {
1259                 kfree(ne->csr->private);
1260                 csr1212_destroy_csr(ne->csr);
1261                 ne->csr = csr;
1262
1263                 /* If the node's configrom generation has changed, we
1264                  * unregister all the unit directories. */
1265                 nodemgr_remove_uds(ne);
1266
1267                 nodemgr_update_bus_options(ne);
1268
1269                 /* Mark the node as new, so it gets re-probed */
1270                 ne->needs_probe = true;
1271         } else {
1272                 /* old cache is valid, so update its generation */
1273                 struct nodemgr_csr_info *ci = ne->csr->private;
1274                 ci->generation = generation;
1275                 /* free the partially filled now unneeded new cache */
1276                 kfree(csr->private);
1277                 csr1212_destroy_csr(csr);
1278         }
1279
1280         /* Mark the node current */
1281         ne->generation = generation;
1282
1283         if (ne->in_limbo) {
1284                 device_remove_file(&ne->device, &dev_attr_ne_in_limbo);
1285                 ne->in_limbo = false;
1286
1287                 HPSB_DEBUG("Node reactivated: "
1288                            "ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1289                            NODE_BUS_ARGS(ne->host, ne->nodeid),
1290                            (unsigned long long)ne->guid);
1291         }
1292 }
1293
1294 static void nodemgr_node_scan_one(struct hpsb_host *host,
1295                                   nodeid_t nodeid, int generation)
1296 {
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, host, nodeid, generation);
1353         else
1354                 nodemgr_update_node(ne, csr, nodeid, generation);
1355 }
1356
1357
1358 static void nodemgr_node_scan(struct hpsb_host *host, int generation)
1359 {
1360         int count;
1361         struct selfid *sid = (struct selfid *)host->topology_map;
1362         nodeid_t nodeid = LOCAL_BUS;
1363
1364         /* Scan each node on the bus */
1365         for (count = host->selfid_count; count; count--, sid++) {
1366                 if (sid->extended)
1367                         continue;
1368
1369                 if (!sid->link_active) {
1370                         nodeid++;
1371                         continue;
1372                 }
1373                 nodemgr_node_scan_one(host, nodeid++, generation);
1374         }
1375 }
1376
1377 static void nodemgr_pause_ne(struct node_entry *ne)
1378 {
1379         HPSB_DEBUG("Node paused: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1380                    NODE_BUS_ARGS(ne->host, ne->nodeid),
1381                    (unsigned long long)ne->guid);
1382
1383         ne->in_limbo = true;
1384         WARN_ON(device_create_file(&ne->device, &dev_attr_ne_in_limbo));
1385 }
1386
1387 static int update_pdrv(struct device *dev, void *data)
1388 {
1389         struct unit_directory *ud;
1390         struct device_driver *drv;
1391         struct hpsb_protocol_driver *pdrv;
1392         struct node_entry *ne = data;
1393         int error;
1394
1395         ud = container_of(dev, struct unit_directory, unit_dev);
1396         if (ud->ne == ne) {
1397                 drv = get_driver(ud->device.driver);
1398                 if (drv) {
1399                         error = 0;
1400                         pdrv = container_of(drv, struct hpsb_protocol_driver,
1401                                             driver);
1402                         if (pdrv->update) {
1403                                 down(&ud->device.sem);
1404                                 error = pdrv->update(ud);
1405                                 up(&ud->device.sem);
1406                         }
1407                         if (error)
1408                                 device_release_driver(&ud->device);
1409                         put_driver(drv);
1410                 }
1411         }
1412
1413         return 0;
1414 }
1415
1416 static void nodemgr_update_pdrv(struct node_entry *ne)
1417 {
1418         class_for_each_device(&nodemgr_ud_class, NULL, ne, update_pdrv);
1419 }
1420
1421 /* Write the BROADCAST_CHANNEL as per IEEE1394a 8.3.2.3.11 and 8.4.2.3.  This
1422  * seems like an optional service but in the end it is practically mandatory
1423  * as a consequence of these clauses.
1424  *
1425  * Note that we cannot do a broadcast write to all nodes at once because some
1426  * pre-1394a devices would hang. */
1427 static void nodemgr_irm_write_bc(struct node_entry *ne, int generation)
1428 {
1429         const u64 bc_addr = (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL);
1430         quadlet_t bc_remote, bc_local;
1431         int error;
1432
1433         if (!ne->host->is_irm || ne->generation != generation ||
1434             ne->nodeid == ne->host->node_id)
1435                 return;
1436
1437         bc_local = cpu_to_be32(ne->host->csr.broadcast_channel);
1438
1439         /* Check if the register is implemented and 1394a compliant. */
1440         error = hpsb_read(ne->host, ne->nodeid, generation, bc_addr, &bc_remote,
1441                           sizeof(bc_remote));
1442         if (!error && bc_remote & cpu_to_be32(0x80000000) &&
1443             bc_remote != bc_local)
1444                 hpsb_node_write(ne, bc_addr, &bc_local, sizeof(bc_local));
1445 }
1446
1447
1448 static void nodemgr_probe_ne(struct hpsb_host *host, struct node_entry *ne,
1449                              int generation)
1450 {
1451         struct device *dev;
1452
1453         if (ne->host != host || ne->in_limbo)
1454                 return;
1455
1456         dev = get_device(&ne->device);
1457         if (!dev)
1458                 return;
1459
1460         nodemgr_irm_write_bc(ne, generation);
1461
1462         /* If "needs_probe", then this is either a new or changed node we
1463          * rescan totally. If the generation matches for an existing node
1464          * (one that existed prior to the bus reset) we send update calls
1465          * down to the drivers. Otherwise, this is a dead node and we
1466          * suspend it. */
1467         if (ne->needs_probe)
1468                 nodemgr_process_root_directory(ne);
1469         else if (ne->generation == generation)
1470                 nodemgr_update_pdrv(ne);
1471         else
1472                 nodemgr_pause_ne(ne);
1473
1474         put_device(dev);
1475 }
1476
1477 struct node_probe_parameter {
1478         struct hpsb_host *host;
1479         int generation;
1480         bool probe_now;
1481 };
1482
1483 static int node_probe(struct device *dev, void *data)
1484 {
1485         struct node_probe_parameter *p = data;
1486         struct node_entry *ne;
1487
1488         if (p->generation != get_hpsb_generation(p->host))
1489                 return -EAGAIN;
1490
1491         ne = container_of(dev, struct node_entry, node_dev);
1492         if (ne->needs_probe == p->probe_now)
1493                 nodemgr_probe_ne(p->host, ne, p->generation);
1494         return 0;
1495 }
1496
1497 static int nodemgr_node_probe(struct hpsb_host *host, int generation)
1498 {
1499         struct node_probe_parameter p;
1500
1501         p.host = host;
1502         p.generation = generation;
1503         /*
1504          * Do some processing of the nodes we've probed. This pulls them
1505          * into the sysfs layer if needed, and can result in processing of
1506          * unit-directories, or just updating the node and it's
1507          * unit-directories.
1508          *
1509          * Run updates before probes. Usually, updates are time-critical
1510          * while probes are time-consuming.
1511          *
1512          * Meanwhile, another bus reset may have happened. In this case we
1513          * skip everything here and let the next bus scan handle it.
1514          * Otherwise we may prematurely remove nodes which are still there.
1515          */
1516         p.probe_now = false;
1517         if (class_for_each_device(&nodemgr_ne_class, NULL, &p, node_probe) != 0)
1518                 return 0;
1519
1520         p.probe_now = true;
1521         if (class_for_each_device(&nodemgr_ne_class, NULL, &p, node_probe) != 0)
1522                 return 0;
1523         /*
1524          * Now let's tell the bus to rescan our devices. This may seem
1525          * like overhead, but the driver-model core will only scan a
1526          * device for a driver when either the device is added, or when a
1527          * new driver is added. A bus reset is a good reason to rescan
1528          * devices that were there before.  For example, an sbp2 device
1529          * may become available for login, if the host that held it was
1530          * just removed.
1531          */
1532         if (bus_rescan_devices(&ieee1394_bus_type) != 0)
1533                 HPSB_DEBUG("bus_rescan_devices had an error");
1534
1535         return 1;
1536 }
1537
1538 static int remove_nodes_in_limbo(struct device *dev, void *data)
1539 {
1540         struct node_entry *ne;
1541
1542         if (dev->bus != &ieee1394_bus_type)
1543                 return 0;
1544
1545         ne = container_of(dev, struct node_entry, device);
1546         if (ne->in_limbo)
1547                 nodemgr_remove_ne(ne);
1548
1549         return 0;
1550 }
1551
1552 static void nodemgr_remove_nodes_in_limbo(struct hpsb_host *host)
1553 {
1554         device_for_each_child(&host->device, NULL, remove_nodes_in_limbo);
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 *data)
1666 {
1667         struct hpsb_host *host = data;
1668         unsigned int g, generation = 0;
1669         int i, reset_cycles = 0;
1670
1671         set_freezable();
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                 /* Pause for 1/4 second in 1/16 second intervals,
1690                  * to make sure things settle down. */
1691                 g = get_hpsb_generation(host);
1692                 for (i = 0; i < 4 ; i++) {
1693                         msleep_interruptible(63);
1694                         try_to_freeze();
1695                         if (kthread_should_stop())
1696                                 goto exit;
1697
1698                         /* Now get the generation in which the node ID's we collect
1699                          * are valid.  During the bus scan we will use this generation
1700                          * for the read transactions, so that if another reset occurs
1701                          * during the scan the transactions will fail instead of
1702                          * returning bogus data. */
1703                         generation = get_hpsb_generation(host);
1704
1705                         /* If we get a reset before we are done waiting, then
1706                          * start the waiting over again */
1707                         if (generation != g)
1708                                 g = generation, i = 0;
1709                 }
1710
1711                 if (!nodemgr_check_irm_capability(host, reset_cycles) ||
1712                     !nodemgr_do_irm_duties(host, reset_cycles)) {
1713                         reset_cycles++;
1714                         continue;
1715                 }
1716                 reset_cycles = 0;
1717
1718                 /* Scan our nodes to get the bus options and create node
1719                  * entries. This does not do the sysfs stuff, since that
1720                  * would trigger uevents and such, which is a bad idea at
1721                  * this point. */
1722                 nodemgr_node_scan(host, generation);
1723
1724                 /* This actually does the full probe, with sysfs
1725                  * registration. */
1726                 if (!nodemgr_node_probe(host, generation))
1727                         continue;
1728
1729                 /* Update some of our sysfs symlinks */
1730                 nodemgr_update_host_dev_links(host);
1731
1732                 /* Sleep 3 seconds */
1733                 for (i = 3000/200; i; i--) {
1734                         msleep_interruptible(200);
1735                         try_to_freeze();
1736                         if (kthread_should_stop())
1737                                 goto exit;
1738
1739                         if (generation != get_hpsb_generation(host))
1740                                 break;
1741                 }
1742                 /* Remove nodes which are gone, unless a bus reset happened */
1743                 if (!i)
1744                         nodemgr_remove_nodes_in_limbo(host);
1745         }
1746 exit:
1747         HPSB_VERBOSE("NodeMgr: Exiting thread");
1748         return 0;
1749 }
1750
1751 struct per_host_parameter {
1752         void *data;
1753         int (*cb)(struct hpsb_host *, void *);
1754 };
1755
1756 static int per_host(struct device *dev, void *data)
1757 {
1758         struct hpsb_host *host;
1759         struct per_host_parameter *p = data;
1760
1761         host = container_of(dev, struct hpsb_host, host_dev);
1762         return p->cb(host, p->data);
1763 }
1764
1765 /**
1766  * nodemgr_for_each_host - call a function for each IEEE 1394 host
1767  * @data: an address to supply to the callback
1768  * @cb: function to call for each host
1769  *
1770  * Iterate the hosts, calling a given function with supplied data for each host.
1771  * If the callback fails on a host, i.e. if it returns a non-zero value, the
1772  * iteration is stopped.
1773  *
1774  * Return value: 0 on success, non-zero on failure (same as returned by last run
1775  * of the callback).
1776  */
1777 int nodemgr_for_each_host(void *data, int (*cb)(struct hpsb_host *, void *))
1778 {
1779         struct per_host_parameter p;
1780
1781         p.cb = cb;
1782         p.data = data;
1783         return class_for_each_device(&hpsb_host_class, NULL, &p, per_host);
1784 }
1785
1786 /* The following two convenience functions use a struct node_entry
1787  * for addressing a node on the bus.  They are intended for use by any
1788  * process context, not just the nodemgr thread, so we need to be a
1789  * little careful when reading out the node ID and generation.  The
1790  * thing that can go wrong is that we get the node ID, then a bus
1791  * reset occurs, and then we read the generation.  The node ID is
1792  * possibly invalid, but the generation is current, and we end up
1793  * sending a packet to a the wrong node.
1794  *
1795  * The solution is to make sure we read the generation first, so that
1796  * if a reset occurs in the process, we end up with a stale generation
1797  * and the transactions will fail instead of silently using wrong node
1798  * ID's.
1799  */
1800
1801 /**
1802  * hpsb_node_fill_packet - fill some destination information into a packet
1803  * @ne: destination node
1804  * @packet: packet to fill in
1805  *
1806  * This will fill in the given, pre-initialised hpsb_packet with the current
1807  * information from the node entry (host, node ID, bus generation number).
1808  */
1809 void hpsb_node_fill_packet(struct node_entry *ne, struct hpsb_packet *packet)
1810 {
1811         packet->host = ne->host;
1812         packet->generation = ne->generation;
1813         barrier();
1814         packet->node_id = ne->nodeid;
1815 }
1816
1817 int hpsb_node_write(struct node_entry *ne, u64 addr,
1818                     quadlet_t *buffer, size_t length)
1819 {
1820         unsigned int generation = ne->generation;
1821
1822         barrier();
1823         return hpsb_write(ne->host, ne->nodeid, generation,
1824                           addr, buffer, length);
1825 }
1826
1827 static void nodemgr_add_host(struct hpsb_host *host)
1828 {
1829         struct host_info *hi;
1830
1831         hi = hpsb_create_hostinfo(&nodemgr_highlevel, host, sizeof(*hi));
1832         if (!hi) {
1833                 HPSB_ERR("NodeMgr: out of memory in add host");
1834                 return;
1835         }
1836         hi->host = host;
1837         hi->thread = kthread_run(nodemgr_host_thread, host, "knodemgrd_%d",
1838                                  host->id);
1839         if (IS_ERR(hi->thread)) {
1840                 HPSB_ERR("NodeMgr: cannot start thread for host %d", host->id);
1841                 hpsb_destroy_hostinfo(&nodemgr_highlevel, host);
1842         }
1843 }
1844
1845 static void nodemgr_host_reset(struct hpsb_host *host)
1846 {
1847         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1848
1849         if (hi) {
1850                 HPSB_VERBOSE("NodeMgr: Processing reset for host %d", host->id);
1851                 wake_up_process(hi->thread);
1852         }
1853 }
1854
1855 static void nodemgr_remove_host(struct hpsb_host *host)
1856 {
1857         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1858
1859         if (hi) {
1860                 kthread_stop(hi->thread);
1861                 nodemgr_remove_host_dev(&host->device);
1862         }
1863 }
1864
1865 static struct hpsb_highlevel nodemgr_highlevel = {
1866         .name =         "Node manager",
1867         .add_host =     nodemgr_add_host,
1868         .host_reset =   nodemgr_host_reset,
1869         .remove_host =  nodemgr_remove_host,
1870 };
1871
1872 int init_ieee1394_nodemgr(void)
1873 {
1874         int error;
1875
1876         error = class_register(&nodemgr_ne_class);
1877         if (error)
1878                 goto fail_ne;
1879         error = class_register(&nodemgr_ud_class);
1880         if (error)
1881                 goto fail_ud;
1882         error = driver_register(&nodemgr_mid_layer_driver);
1883         if (error)
1884                 goto fail_ml;
1885         /* This driver is not used if nodemgr is off (disable_nodemgr=1). */
1886         nodemgr_dev_template_host.driver = &nodemgr_mid_layer_driver;
1887
1888         hpsb_register_highlevel(&nodemgr_highlevel);
1889         return 0;
1890
1891 fail_ml:
1892         class_unregister(&nodemgr_ud_class);
1893 fail_ud:
1894         class_unregister(&nodemgr_ne_class);
1895 fail_ne:
1896         return error;
1897 }
1898
1899 void cleanup_ieee1394_nodemgr(void)
1900 {
1901         hpsb_unregister_highlevel(&nodemgr_highlevel);
1902         driver_unregister(&nodemgr_mid_layer_driver);
1903         class_unregister(&nodemgr_ud_class);
1904         class_unregister(&nodemgr_ne_class);
1905 }