[PATCH] Cleanup patch for process freezing
[linux-2.6.git] / 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/kernel.h>
12 #include <linux/config.h>
13 #include <linux/list.h>
14 #include <linux/slab.h>
15 #include <linux/smp_lock.h>
16 #include <linux/interrupt.h>
17 #include <linux/kmod.h>
18 #include <linux/completion.h>
19 #include <linux/delay.h>
20 #include <linux/pci.h>
21 #include <linux/moduleparam.h>
22 #include <asm/atomic.h>
23
24 #include "ieee1394_types.h"
25 #include "ieee1394.h"
26 #include "ieee1394_core.h"
27 #include "hosts.h"
28 #include "ieee1394_transactions.h"
29 #include "highlevel.h"
30 #include "csr.h"
31 #include "nodemgr.h"
32
33 static int ignore_drivers = 0;
34 module_param(ignore_drivers, int, 0444);
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 };
42
43
44 static char *nodemgr_find_oui_name(int oui)
45 {
46 #ifdef CONFIG_IEEE1394_OUI_DB
47         extern struct oui_list_struct {
48                 int oui;
49                 char *name;
50         } oui_list[];
51         int i;
52
53         for (i = 0; oui_list[i].name; i++)
54                 if (oui_list[i].oui == oui)
55                         return oui_list[i].name;
56 #endif
57         return NULL;
58 }
59
60
61 static int nodemgr_bus_read(struct csr1212_csr *csr, u64 addr, u16 length,
62                             void *buffer, void *__ci)
63 {
64         struct nodemgr_csr_info *ci = (struct nodemgr_csr_info*)__ci;
65         int i, ret = 0;
66
67         for (i = 0; i < 3; i++) {
68                 ret = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
69                                 buffer, length);
70                 if (!ret)
71                         break;
72
73                 if (msleep_interruptible(334))
74                         return -EINTR;
75         }
76
77         return ret;
78 }
79
80 static int nodemgr_get_max_rom(quadlet_t *bus_info_data, void *__ci)
81 {
82         return (CSR1212_BE32_TO_CPU(bus_info_data[2]) >> 8) & 0x3;
83 }
84
85 static struct csr1212_bus_ops nodemgr_csr_ops = {
86         .bus_read =     nodemgr_bus_read,
87         .get_max_rom =  nodemgr_get_max_rom
88 };
89
90
91 /*
92  * Basically what we do here is start off retrieving the bus_info block.
93  * From there will fill in some info about the node, verify it is of IEEE
94  * 1394 type, and that the crc checks out ok. After that we start off with
95  * the root directory, and subdirectories. To do this, we retrieve the
96  * quadlet header for a directory, find out the length, and retrieve the
97  * complete directory entry (be it a leaf or a directory). We then process
98  * it and add the info to our structure for that particular node.
99  *
100  * We verify CRC's along the way for each directory/block/leaf. The entire
101  * node structure is generic, and simply stores the information in a way
102  * that's easy to parse by the protocol interface.
103  */
104
105 /*
106  * The nodemgr relies heavily on the Driver Model for device callbacks and
107  * driver/device mappings. The old nodemgr used to handle all this itself,
108  * but now we are much simpler because of the LDM.
109  */
110
111 static DECLARE_MUTEX(nodemgr_serialize);
112
113 struct host_info {
114         struct hpsb_host *host;
115         struct list_head list;
116         struct completion exited;
117         struct semaphore reset_sem;
118         int pid;
119         char daemon_name[15];
120         int kill_me;
121 };
122
123 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv);
124 static int nodemgr_hotplug(struct class_device *cdev, char **envp, int num_envp,
125                            char *buffer, int buffer_size);
126 static void nodemgr_resume_ne(struct node_entry *ne);
127 static void nodemgr_remove_ne(struct node_entry *ne);
128 static struct node_entry *find_entry_by_guid(u64 guid);
129
130 struct bus_type ieee1394_bus_type = {
131         .name           = "ieee1394",
132         .match          = nodemgr_bus_match,
133 };
134
135 static void host_cls_release(struct class_device *class_dev)
136 {
137         put_device(&container_of((class_dev), struct hpsb_host, class_dev)->device);
138 }
139
140 struct class hpsb_host_class = {
141         .name           = "ieee1394_host",
142         .release        = host_cls_release,
143 };
144
145 static void ne_cls_release(struct class_device *class_dev)
146 {
147         put_device(&container_of((class_dev), struct node_entry, class_dev)->device);
148 }
149
150 static struct class nodemgr_ne_class = {
151         .name           = "ieee1394_node",
152         .release        = ne_cls_release,
153 };
154
155 static void ud_cls_release(struct class_device *class_dev)
156 {
157         put_device(&container_of((class_dev), struct unit_directory, class_dev)->device);
158 }
159
160 /* The name here is only so that unit directory hotplug works with old
161  * style hotplug, which only ever did unit directories anyway. */
162 static struct class nodemgr_ud_class = {
163         .name           = "ieee1394",
164         .release        = ud_cls_release,
165         .hotplug        = nodemgr_hotplug,
166 };
167
168 static struct hpsb_highlevel nodemgr_highlevel;
169
170
171 static void nodemgr_release_ud(struct device *dev)
172 {
173         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
174
175         if (ud->vendor_name_kv)
176                 csr1212_release_keyval(ud->vendor_name_kv);
177         if (ud->model_name_kv)
178                 csr1212_release_keyval(ud->model_name_kv);
179
180         kfree(ud);
181 }
182
183 static void nodemgr_release_ne(struct device *dev)
184 {
185         struct node_entry *ne = container_of(dev, struct node_entry, device);
186
187         if (ne->vendor_name_kv)
188                 csr1212_release_keyval(ne->vendor_name_kv);
189
190         kfree(ne);
191 }
192
193
194 static void nodemgr_release_host(struct device *dev)
195 {
196         struct hpsb_host *host = container_of(dev, struct hpsb_host, device);
197
198         csr1212_destroy_csr(host->csr.rom);
199
200         kfree(host);
201 }
202
203 static int nodemgr_ud_platform_data;
204
205 static struct device nodemgr_dev_template_ud = {
206         .bus            = &ieee1394_bus_type,
207         .release        = nodemgr_release_ud,
208         .platform_data  = &nodemgr_ud_platform_data,
209 };
210
211 static struct device nodemgr_dev_template_ne = {
212         .bus            = &ieee1394_bus_type,
213         .release        = nodemgr_release_ne,
214 };
215
216 struct device nodemgr_dev_template_host = {
217         .bus            = &ieee1394_bus_type,
218         .release        = nodemgr_release_host,
219 };
220
221
222 #define fw_attr(class, class_type, field, type, format_string)          \
223 static ssize_t fw_show_##class##_##field (struct device *dev, struct device_attribute *attr, char *buf)\
224 {                                                                       \
225         class_type *class;                                              \
226         class = container_of(dev, class_type, device);                  \
227         return sprintf(buf, format_string, (type)class->field);         \
228 }                                                                       \
229 static struct device_attribute dev_attr_##class##_##field = {           \
230         .attr = {.name = __stringify(field), .mode = S_IRUGO },         \
231         .show   = fw_show_##class##_##field,                            \
232 };
233
234 #define fw_attr_td(class, class_type, td_kv)                            \
235 static ssize_t fw_show_##class##_##td_kv (struct device *dev, struct device_attribute *attr, char *buf)\
236 {                                                                       \
237         int len;                                                        \
238         class_type *class = container_of(dev, class_type, device);      \
239         len = (class->td_kv->value.leaf.len - 2) * sizeof(quadlet_t);   \
240         memcpy(buf,                                                     \
241                CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(class->td_kv),      \
242                len);                                                    \
243         while ((buf + len - 1) == '\0')                                 \
244                 len--;                                                  \
245         buf[len++] = '\n';                                              \
246         buf[len] = '\0';                                                \
247         return len;                                                     \
248 }                                                                       \
249 static struct device_attribute dev_attr_##class##_##td_kv = {           \
250         .attr = {.name = __stringify(td_kv), .mode = S_IRUGO },         \
251         .show   = fw_show_##class##_##td_kv,                            \
252 };
253
254
255 #define fw_drv_attr(field, type, format_string)                 \
256 static ssize_t fw_drv_show_##field (struct device_driver *drv, char *buf) \
257 {                                                               \
258         struct hpsb_protocol_driver *driver;                    \
259         driver = container_of(drv, struct hpsb_protocol_driver, driver); \
260         return sprintf(buf, format_string, (type)driver->field);\
261 }                                                               \
262 static struct driver_attribute driver_attr_drv_##field = {      \
263         .attr = {.name = __stringify(field), .mode = S_IRUGO }, \
264         .show   = fw_drv_show_##field,                          \
265 };
266
267
268 static ssize_t fw_show_ne_bus_options(struct device *dev, struct device_attribute *attr, char *buf)
269 {
270         struct node_entry *ne = container_of(dev, struct node_entry, device);
271
272         return sprintf(buf, "IRMC(%d) CMC(%d) ISC(%d) BMC(%d) PMC(%d) GEN(%d) "
273                        "LSPD(%d) MAX_REC(%d) MAX_ROM(%d) CYC_CLK_ACC(%d)\n",
274                        ne->busopt.irmc,
275                        ne->busopt.cmc, ne->busopt.isc, ne->busopt.bmc,
276                        ne->busopt.pmc, ne->busopt.generation, ne->busopt.lnkspd,
277                        ne->busopt.max_rec,
278                        ne->busopt.max_rom,
279                        ne->busopt.cyc_clk_acc);
280 }
281 static DEVICE_ATTR(bus_options,S_IRUGO,fw_show_ne_bus_options,NULL);
282
283
284 static ssize_t fw_show_ne_tlabels_free(struct device *dev, struct device_attribute *attr, char *buf)
285 {
286         struct node_entry *ne = container_of(dev, struct node_entry, device);
287         return sprintf(buf, "%d\n", atomic_read(&ne->tpool->count.count) + 1);
288 }
289 static DEVICE_ATTR(tlabels_free,S_IRUGO,fw_show_ne_tlabels_free,NULL);
290
291
292 static ssize_t fw_show_ne_tlabels_allocations(struct device *dev, struct device_attribute *attr, char *buf)
293 {
294         struct node_entry *ne = container_of(dev, struct node_entry, device);
295         return sprintf(buf, "%u\n", ne->tpool->allocations);
296 }
297 static DEVICE_ATTR(tlabels_allocations,S_IRUGO,fw_show_ne_tlabels_allocations,NULL);
298
299
300 static ssize_t fw_show_ne_tlabels_mask(struct device *dev, struct device_attribute *attr, char *buf)
301 {
302         struct node_entry *ne = container_of(dev, struct node_entry, device);
303 #if (BITS_PER_LONG <= 32)
304         return sprintf(buf, "0x%08lx%08lx\n", ne->tpool->pool[0], ne->tpool->pool[1]);
305 #else
306         return sprintf(buf, "0x%016lx\n", ne->tpool->pool[0]);
307 #endif
308 }
309 static DEVICE_ATTR(tlabels_mask, S_IRUGO, fw_show_ne_tlabels_mask, NULL);
310
311
312 static ssize_t fw_set_ignore_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
313 {
314         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
315         int state = simple_strtoul(buf, NULL, 10);
316
317         if (state == 1) {
318                 down_write(&dev->bus->subsys.rwsem);
319                 device_release_driver(dev);
320                 ud->ignore_driver = 1;
321                 up_write(&dev->bus->subsys.rwsem);
322         } else if (!state)
323                 ud->ignore_driver = 0;
324
325         return count;
326 }
327 static ssize_t fw_get_ignore_driver(struct device *dev, struct device_attribute *attr, char *buf)
328 {
329         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
330
331         return sprintf(buf, "%d\n", ud->ignore_driver);
332 }
333 static DEVICE_ATTR(ignore_driver, S_IWUSR | S_IRUGO, fw_get_ignore_driver, fw_set_ignore_driver);
334
335
336 static ssize_t fw_set_destroy_node(struct bus_type *bus, const char *buf, size_t count)
337 {
338         struct node_entry *ne;
339         u64 guid = (u64)simple_strtoull(buf, NULL, 16);
340
341         ne = find_entry_by_guid(guid);
342
343         if (ne == NULL || !ne->in_limbo)
344                 return -EINVAL;
345
346         nodemgr_remove_ne(ne);
347
348         return count;
349 }
350 static ssize_t fw_get_destroy_node(struct bus_type *bus, char *buf)
351 {
352         return sprintf(buf, "You can destroy in_limbo nodes by writing their GUID to this file\n");
353 }
354 static BUS_ATTR(destroy_node, S_IWUSR | S_IRUGO, fw_get_destroy_node, fw_set_destroy_node);
355
356 static int nodemgr_rescan_bus_thread(void *__unused)
357 {
358         /* No userlevel access needed */
359         daemonize("kfwrescan");
360
361         bus_rescan_devices(&ieee1394_bus_type);
362
363         return 0;
364 }
365
366 static ssize_t fw_set_rescan(struct bus_type *bus, const char *buf, size_t count)
367 {
368         int state = simple_strtoul(buf, NULL, 10);
369
370         /* Don't wait for this, or care about errors. Root could do
371          * something stupid and spawn this a lot of times, but that's
372          * root's fault. */
373         if (state == 1)
374                 kernel_thread(nodemgr_rescan_bus_thread, NULL, CLONE_KERNEL);
375
376         return count;
377 }
378 static ssize_t fw_get_rescan(struct bus_type *bus, char *buf)
379 {
380         return sprintf(buf, "You can force a rescan of the bus for "
381                         "drivers by writing a 1 to this file\n");
382 }
383 static BUS_ATTR(rescan, S_IWUSR | S_IRUGO, fw_get_rescan, fw_set_rescan);
384
385
386 static ssize_t fw_set_ignore_drivers(struct bus_type *bus, const char *buf, size_t count)
387 {
388         int state = simple_strtoul(buf, NULL, 10);
389
390         if (state == 1)
391                 ignore_drivers = 1;
392         else if (!state)
393                 ignore_drivers = 0;
394
395         return count;
396 }
397 static ssize_t fw_get_ignore_drivers(struct bus_type *bus, char *buf)
398 {
399         return sprintf(buf, "%d\n", ignore_drivers);
400 }
401 static BUS_ATTR(ignore_drivers, S_IWUSR | S_IRUGO, fw_get_ignore_drivers, fw_set_ignore_drivers);
402
403
404 struct bus_attribute *const fw_bus_attrs[] = {
405         &bus_attr_destroy_node,
406         &bus_attr_rescan,
407         &bus_attr_ignore_drivers,
408         NULL
409 };
410
411
412 fw_attr(ne, struct node_entry, capabilities, unsigned int, "0x%06x\n")
413 fw_attr(ne, struct node_entry, nodeid, unsigned int, "0x%04x\n")
414
415 fw_attr(ne, struct node_entry, vendor_id, unsigned int, "0x%06x\n")
416 fw_attr_td(ne, struct node_entry, vendor_name_kv)
417 fw_attr(ne, struct node_entry, vendor_oui, const char *, "%s\n")
418
419 fw_attr(ne, struct node_entry, guid, unsigned long long, "0x%016Lx\n")
420 fw_attr(ne, struct node_entry, guid_vendor_id, unsigned int, "0x%06x\n")
421 fw_attr(ne, struct node_entry, guid_vendor_oui, const char *, "%s\n")
422 fw_attr(ne, struct node_entry, in_limbo, int, "%d\n");
423
424 static struct device_attribute *const fw_ne_attrs[] = {
425         &dev_attr_ne_guid,
426         &dev_attr_ne_guid_vendor_id,
427         &dev_attr_ne_capabilities,
428         &dev_attr_ne_vendor_id,
429         &dev_attr_ne_nodeid,
430         &dev_attr_bus_options,
431         &dev_attr_tlabels_free,
432         &dev_attr_tlabels_allocations,
433         &dev_attr_tlabels_mask,
434 };
435
436
437
438 fw_attr(ud, struct unit_directory, address, unsigned long long, "0x%016Lx\n")
439 fw_attr(ud, struct unit_directory, length, int, "%d\n")
440 /* These are all dependent on the value being provided */
441 fw_attr(ud, struct unit_directory, vendor_id, unsigned int, "0x%06x\n")
442 fw_attr(ud, struct unit_directory, model_id, unsigned int, "0x%06x\n")
443 fw_attr(ud, struct unit_directory, specifier_id, unsigned int, "0x%06x\n")
444 fw_attr(ud, struct unit_directory, version, unsigned int, "0x%06x\n")
445 fw_attr_td(ud, struct unit_directory, vendor_name_kv)
446 fw_attr(ud, struct unit_directory, vendor_oui, const char *, "%s\n")
447 fw_attr_td(ud, struct unit_directory, model_name_kv)
448
449 static struct device_attribute *const fw_ud_attrs[] = {
450         &dev_attr_ud_address,
451         &dev_attr_ud_length,
452         &dev_attr_ignore_driver,
453 };
454
455
456 fw_attr(host, struct hpsb_host, node_count, int, "%d\n")
457 fw_attr(host, struct hpsb_host, selfid_count, int, "%d\n")
458 fw_attr(host, struct hpsb_host, nodes_active, int, "%d\n")
459 fw_attr(host, struct hpsb_host, in_bus_reset, int, "%d\n")
460 fw_attr(host, struct hpsb_host, is_root, int, "%d\n")
461 fw_attr(host, struct hpsb_host, is_cycmst, int, "%d\n")
462 fw_attr(host, struct hpsb_host, is_irm, int, "%d\n")
463 fw_attr(host, struct hpsb_host, is_busmgr, int, "%d\n")
464
465 static struct device_attribute *const fw_host_attrs[] = {
466         &dev_attr_host_node_count,
467         &dev_attr_host_selfid_count,
468         &dev_attr_host_nodes_active,
469         &dev_attr_host_in_bus_reset,
470         &dev_attr_host_is_root,
471         &dev_attr_host_is_cycmst,
472         &dev_attr_host_is_irm,
473         &dev_attr_host_is_busmgr,
474 };
475
476
477 static ssize_t fw_show_drv_device_ids(struct device_driver *drv, char *buf)
478 {
479         struct hpsb_protocol_driver *driver;
480         struct ieee1394_device_id *id;
481         int length = 0;
482         char *scratch = buf;
483
484         driver = container_of(drv, struct hpsb_protocol_driver, driver);
485
486         for (id = driver->id_table; id->match_flags != 0; id++) {
487                 int need_coma = 0;
488
489                 if (id->match_flags & IEEE1394_MATCH_VENDOR_ID) {
490                         length += sprintf(scratch, "vendor_id=0x%06x", id->vendor_id);
491                         scratch = buf + length;
492                         need_coma++;
493                 }
494
495                 if (id->match_flags & IEEE1394_MATCH_MODEL_ID) {
496                         length += sprintf(scratch, "%smodel_id=0x%06x",
497                                           need_coma++ ? "," : "",
498                                           id->model_id);
499                         scratch = buf + length;
500                 }
501
502                 if (id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) {
503                         length += sprintf(scratch, "%sspecifier_id=0x%06x",
504                                           need_coma++ ? "," : "",
505                                           id->specifier_id);
506                         scratch = buf + length;
507                 }
508
509                 if (id->match_flags & IEEE1394_MATCH_VERSION) {
510                         length += sprintf(scratch, "%sversion=0x%06x",
511                                           need_coma++ ? "," : "",
512                                           id->version);
513                         scratch = buf + length;
514                 }
515
516                 if (need_coma) {
517                         *scratch++ = '\n';
518                         length++;
519                 }
520         }
521
522         return length;
523 }
524 static DRIVER_ATTR(device_ids,S_IRUGO,fw_show_drv_device_ids,NULL);
525
526
527 fw_drv_attr(name, const char *, "%s\n")
528
529 static struct driver_attribute *const fw_drv_attrs[] = {
530         &driver_attr_drv_name,
531         &driver_attr_device_ids,
532 };
533
534
535 static void nodemgr_create_drv_files(struct hpsb_protocol_driver *driver)
536 {
537         struct device_driver *drv = &driver->driver;
538         int i;
539
540         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
541                 driver_create_file(drv, fw_drv_attrs[i]);
542 }
543
544
545 static void nodemgr_remove_drv_files(struct hpsb_protocol_driver *driver)
546 {
547         struct device_driver *drv = &driver->driver;
548         int i;
549
550         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
551                 driver_remove_file(drv, fw_drv_attrs[i]);
552 }
553
554
555 static void nodemgr_create_ne_dev_files(struct node_entry *ne)
556 {
557         struct device *dev = &ne->device;
558         int i;
559
560         for (i = 0; i < ARRAY_SIZE(fw_ne_attrs); i++)
561                 device_create_file(dev, fw_ne_attrs[i]);
562 }
563
564
565 static void nodemgr_create_host_dev_files(struct hpsb_host *host)
566 {
567         struct device *dev = &host->device;
568         int i;
569
570         for (i = 0; i < ARRAY_SIZE(fw_host_attrs); i++)
571                 device_create_file(dev, fw_host_attrs[i]);
572 }
573
574
575 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host, nodeid_t nodeid);
576
577 static void nodemgr_update_host_dev_links(struct hpsb_host *host)
578 {
579         struct device *dev = &host->device;
580         struct node_entry *ne;
581
582         sysfs_remove_link(&dev->kobj, "irm_id");
583         sysfs_remove_link(&dev->kobj, "busmgr_id");
584         sysfs_remove_link(&dev->kobj, "host_id");
585
586         if ((ne = find_entry_by_nodeid(host, host->irm_id)))
587                 sysfs_create_link(&dev->kobj, &ne->device.kobj, "irm_id");
588         if ((ne = find_entry_by_nodeid(host, host->busmgr_id)))
589                 sysfs_create_link(&dev->kobj, &ne->device.kobj, "busmgr_id");
590         if ((ne = find_entry_by_nodeid(host, host->node_id)))
591                 sysfs_create_link(&dev->kobj, &ne->device.kobj, "host_id");
592 }
593
594 static void nodemgr_create_ud_dev_files(struct unit_directory *ud)
595 {
596         struct device *dev = &ud->device;
597         int i;
598
599         for (i = 0; i < ARRAY_SIZE(fw_ud_attrs); i++)
600                 device_create_file(dev, fw_ud_attrs[i]);
601
602         if (ud->flags & UNIT_DIRECTORY_SPECIFIER_ID)
603                 device_create_file(dev, &dev_attr_ud_specifier_id);
604
605         if (ud->flags & UNIT_DIRECTORY_VERSION)
606                 device_create_file(dev, &dev_attr_ud_version);
607
608         if (ud->flags & UNIT_DIRECTORY_VENDOR_ID) {
609                 device_create_file(dev, &dev_attr_ud_vendor_id);
610                 if (ud->vendor_name_kv)
611                         device_create_file(dev, &dev_attr_ud_vendor_name_kv);
612         }
613
614         if (ud->flags & UNIT_DIRECTORY_MODEL_ID) {
615                 device_create_file(dev, &dev_attr_ud_model_id);
616                 if (ud->model_name_kv)
617                         device_create_file(dev, &dev_attr_ud_model_name_kv);
618         }
619 }
620
621
622 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv)
623 {
624         struct hpsb_protocol_driver *driver;
625         struct unit_directory *ud;
626         struct ieee1394_device_id *id;
627
628         /* We only match unit directories */
629         if (dev->platform_data != &nodemgr_ud_platform_data)
630                 return 0;
631
632         ud = container_of(dev, struct unit_directory, device);
633         driver = container_of(drv, struct hpsb_protocol_driver, driver);
634
635         if (ud->ne->in_limbo || ud->ignore_driver)
636                 return 0;
637
638         for (id = driver->id_table; id->match_flags != 0; id++) {
639                 if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) &&
640                     id->vendor_id != ud->vendor_id)
641                         continue;
642
643                 if ((id->match_flags & IEEE1394_MATCH_MODEL_ID) &&
644                     id->model_id != ud->model_id)
645                         continue;
646
647                 if ((id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) &&
648                     id->specifier_id != ud->specifier_id)
649                         continue;
650
651                 if ((id->match_flags & IEEE1394_MATCH_VERSION) &&
652                     id->version != ud->version)
653                         continue;
654
655                 return 1;
656         }
657
658         return 0;
659 }
660
661
662 static void nodemgr_remove_uds(struct node_entry *ne)
663 {
664         struct class_device *cdev, *next;
665         struct unit_directory *ud;
666
667         list_for_each_entry_safe(cdev, next, &nodemgr_ud_class.children, node) {
668                 ud = container_of(cdev, struct unit_directory, class_dev);
669
670                 if (ud->ne != ne)
671                         continue;
672
673                 class_device_unregister(&ud->class_dev);
674                 device_unregister(&ud->device);
675         }
676 }
677
678
679 static void nodemgr_remove_ne(struct node_entry *ne)
680 {
681         struct device *dev = &ne->device;
682
683         dev = get_device(&ne->device);
684         if (!dev)
685                 return;
686
687         HPSB_DEBUG("Node removed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
688                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
689
690         nodemgr_remove_uds(ne);
691
692         class_device_unregister(&ne->class_dev);
693         device_unregister(dev);
694
695         put_device(dev);
696 }
697
698 static int __nodemgr_remove_host_dev(struct device *dev, void *data)
699 {
700         nodemgr_remove_ne(container_of(dev, struct node_entry, device));
701         return 0;
702 }
703
704 static void nodemgr_remove_host_dev(struct device *dev)
705 {
706         device_for_each_child(dev, NULL, __nodemgr_remove_host_dev);
707         sysfs_remove_link(&dev->kobj, "irm_id");
708         sysfs_remove_link(&dev->kobj, "busmgr_id");
709         sysfs_remove_link(&dev->kobj, "host_id");
710 }
711
712
713 static void nodemgr_update_bus_options(struct node_entry *ne)
714 {
715 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
716         static const u16 mr[] = { 4, 64, 1024, 0};
717 #endif
718         quadlet_t busoptions = be32_to_cpu(ne->csr->bus_info_data[2]);
719
720         ne->busopt.irmc         = (busoptions >> 31) & 1;
721         ne->busopt.cmc          = (busoptions >> 30) & 1;
722         ne->busopt.isc          = (busoptions >> 29) & 1;
723         ne->busopt.bmc          = (busoptions >> 28) & 1;
724         ne->busopt.pmc          = (busoptions >> 27) & 1;
725         ne->busopt.cyc_clk_acc  = (busoptions >> 16) & 0xff;
726         ne->busopt.max_rec      = 1 << (((busoptions >> 12) & 0xf) + 1);
727         ne->busopt.max_rom      = (busoptions >> 8) & 0x3;
728         ne->busopt.generation   = (busoptions >> 4) & 0xf;
729         ne->busopt.lnkspd       = busoptions & 0x7;
730
731         HPSB_VERBOSE("NodeMgr: raw=0x%08x irmc=%d cmc=%d isc=%d bmc=%d pmc=%d "
732                      "cyc_clk_acc=%d max_rec=%d max_rom=%d gen=%d lspd=%d",
733                      busoptions, ne->busopt.irmc, ne->busopt.cmc,
734                      ne->busopt.isc, ne->busopt.bmc, ne->busopt.pmc,
735                      ne->busopt.cyc_clk_acc, ne->busopt.max_rec,
736                      mr[ne->busopt.max_rom],
737                      ne->busopt.generation, ne->busopt.lnkspd);
738 }
739
740
741 static struct node_entry *nodemgr_create_node(octlet_t guid, struct csr1212_csr *csr,
742                                               struct host_info *hi, nodeid_t nodeid,
743                                               unsigned int generation)
744 {
745         struct hpsb_host *host = hi->host;
746         struct node_entry *ne;
747
748         ne = kmalloc(sizeof(struct node_entry), GFP_KERNEL);
749         if (!ne) return NULL;
750
751         memset(ne, 0, sizeof(struct node_entry));
752
753         ne->tpool = &host->tpool[nodeid & NODE_MASK];
754
755         ne->host = host;
756         ne->nodeid = nodeid;
757         ne->generation = generation;
758         ne->needs_probe = 1;
759
760         ne->guid = guid;
761         ne->guid_vendor_id = (guid >> 40) & 0xffffff;
762         ne->guid_vendor_oui = nodemgr_find_oui_name(ne->guid_vendor_id);
763         ne->csr = csr;
764
765         memcpy(&ne->device, &nodemgr_dev_template_ne,
766                sizeof(ne->device));
767         ne->device.parent = &host->device;
768         snprintf(ne->device.bus_id, BUS_ID_SIZE, "%016Lx",
769                  (unsigned long long)(ne->guid));
770
771         ne->class_dev.dev = &ne->device;
772         ne->class_dev.class = &nodemgr_ne_class;
773         snprintf(ne->class_dev.class_id, BUS_ID_SIZE, "%016Lx",
774                  (unsigned long long)(ne->guid));
775
776         device_register(&ne->device);
777         class_device_register(&ne->class_dev);
778         get_device(&ne->device);
779
780         if (ne->guid_vendor_oui)
781                 device_create_file(&ne->device, &dev_attr_ne_guid_vendor_oui);
782         nodemgr_create_ne_dev_files(ne);
783
784         nodemgr_update_bus_options(ne);
785
786         HPSB_DEBUG("%s added: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
787                    (host->node_id == nodeid) ? "Host" : "Node",
788                    NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
789
790         return ne;
791 }
792
793
794 static struct node_entry *find_entry_by_guid(u64 guid)
795 {
796         struct class *class = &nodemgr_ne_class;
797         struct class_device *cdev;
798         struct node_entry *ne, *ret_ne = NULL;
799
800         down_read(&class->subsys.rwsem);
801         list_for_each_entry(cdev, &class->children, node) {
802                 ne = container_of(cdev, struct node_entry, class_dev);
803
804                 if (ne->guid == guid) {
805                         ret_ne = ne;
806                         break;
807                 }
808         }
809         up_read(&class->subsys.rwsem);
810
811         return ret_ne;
812 }
813
814
815 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host, nodeid_t nodeid)
816 {
817         struct class *class = &nodemgr_ne_class;
818         struct class_device *cdev;
819         struct node_entry *ne, *ret_ne = NULL;
820
821         down_read(&class->subsys.rwsem);
822         list_for_each_entry(cdev, &class->children, node) {
823                 ne = container_of(cdev, struct node_entry, class_dev);
824
825                 if (ne->host == host && ne->nodeid == nodeid) {
826                         ret_ne = ne;
827                         break;
828                 }
829         }
830         up_read(&class->subsys.rwsem);
831
832         return ret_ne;
833 }
834
835
836 static void nodemgr_register_device(struct node_entry *ne, 
837         struct unit_directory *ud, struct device *parent)
838 {
839         memcpy(&ud->device, &nodemgr_dev_template_ud,
840                sizeof(ud->device));
841
842         ud->device.parent = parent;
843
844         snprintf(ud->device.bus_id, BUS_ID_SIZE, "%s-%u",
845                  ne->device.bus_id, ud->id);
846
847         ud->class_dev.dev = &ud->device;
848         ud->class_dev.class = &nodemgr_ud_class;
849         snprintf(ud->class_dev.class_id, BUS_ID_SIZE, "%s-%u",
850                  ne->device.bus_id, ud->id);
851
852         device_register(&ud->device);
853         class_device_register(&ud->class_dev);
854         get_device(&ud->device);
855
856         if (ud->vendor_oui)
857                 device_create_file(&ud->device, &dev_attr_ud_vendor_oui);
858         nodemgr_create_ud_dev_files(ud);
859 }       
860
861
862 /* This implementation currently only scans the config rom and its
863  * immediate unit directories looking for software_id and
864  * software_version entries, in order to get driver autoloading working. */
865 static struct unit_directory *nodemgr_process_unit_directory
866         (struct host_info *hi, struct node_entry *ne, struct csr1212_keyval *ud_kv,
867          unsigned int *id, struct unit_directory *parent)
868 {
869         struct unit_directory *ud;
870         struct unit_directory *ud_child = NULL;
871         struct csr1212_dentry *dentry;
872         struct csr1212_keyval *kv;
873         u8 last_key_id = 0;
874
875         ud = kmalloc(sizeof(struct unit_directory), GFP_KERNEL);
876         if (!ud)
877                 goto unit_directory_error;
878
879         memset (ud, 0, sizeof(struct unit_directory));
880
881         ud->ne = ne;
882         ud->ignore_driver = ignore_drivers;
883         ud->address = ud_kv->offset + CSR1212_CONFIG_ROM_SPACE_BASE;
884         ud->ud_kv = ud_kv;
885         ud->id = (*id)++;
886
887         csr1212_for_each_dir_entry(ne->csr, kv, ud_kv, dentry) {
888                 switch (kv->key.id) {
889                 case CSR1212_KV_ID_VENDOR:
890                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
891                                 ud->vendor_id = kv->value.immediate;
892                                 ud->flags |= UNIT_DIRECTORY_VENDOR_ID;
893
894                                 if (ud->vendor_id)
895                                         ud->vendor_oui = nodemgr_find_oui_name(ud->vendor_id);
896                         }
897                         break;
898
899                 case CSR1212_KV_ID_MODEL:
900                         ud->model_id = kv->value.immediate;
901                         ud->flags |= UNIT_DIRECTORY_MODEL_ID;
902                         break;
903
904                 case CSR1212_KV_ID_SPECIFIER_ID:
905                         ud->specifier_id = kv->value.immediate;
906                         ud->flags |= UNIT_DIRECTORY_SPECIFIER_ID;
907                         break;
908
909                 case CSR1212_KV_ID_VERSION:
910                         ud->version = kv->value.immediate;
911                         ud->flags |= UNIT_DIRECTORY_VERSION;
912                         break;
913
914                 case CSR1212_KV_ID_DESCRIPTOR:
915                         if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
916                             CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
917                             CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
918                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
919                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
920                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
921                                 switch (last_key_id) {
922                                 case CSR1212_KV_ID_VENDOR:
923                                         ud->vendor_name_kv = kv;
924                                         csr1212_keep_keyval(kv);
925                                         break;
926
927                                 case CSR1212_KV_ID_MODEL:
928                                         ud->model_name_kv = kv;
929                                         csr1212_keep_keyval(kv);
930                                         break;
931
932                                 }
933                         } /* else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) ... */
934                         break;
935
936                 case CSR1212_KV_ID_DEPENDENT_INFO:
937                         /* Logical Unit Number */
938                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
939                                 if (ud->flags & UNIT_DIRECTORY_HAS_LUN) {
940                                         ud_child = kmalloc(sizeof(struct unit_directory), GFP_KERNEL);
941                                         if (!ud_child)
942                                                 goto unit_directory_error;
943                                         memcpy(ud_child, ud, sizeof(struct unit_directory));
944                                         nodemgr_register_device(ne, ud_child, &ne->device);
945                                         ud_child = NULL;
946                                         
947                                         ud->id = (*id)++;
948                                 }
949                                 ud->lun = kv->value.immediate;
950                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN;
951
952                         /* Logical Unit Directory */
953                         } else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) {
954                                 /* This should really be done in SBP2 as this is
955                                  * doing SBP2 specific parsing.
956                                  */
957                                 
958                                 /* first register the parent unit */
959                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN_DIRECTORY;
960                                 if (ud->device.bus != &ieee1394_bus_type)
961                                         nodemgr_register_device(ne, ud, &ne->device);
962                                 
963                                 /* process the child unit */
964                                 ud_child = nodemgr_process_unit_directory(hi, ne, kv, id, ud);
965
966                                 if (ud_child == NULL)
967                                         break;
968                                 
969                                 /* inherit unspecified values so hotplug picks it up */
970                                 if ((ud->flags & UNIT_DIRECTORY_MODEL_ID) &&
971                                     !(ud_child->flags & UNIT_DIRECTORY_MODEL_ID))
972                                 {
973                                         ud_child->flags |=  UNIT_DIRECTORY_MODEL_ID;
974                                         ud_child->model_id = ud->model_id;
975                                 }
976                                 if ((ud->flags & UNIT_DIRECTORY_SPECIFIER_ID) &&
977                                     !(ud_child->flags & UNIT_DIRECTORY_SPECIFIER_ID))
978                                 {
979                                         ud_child->flags |=  UNIT_DIRECTORY_SPECIFIER_ID;
980                                         ud_child->specifier_id = ud->specifier_id;
981                                 }
982                                 if ((ud->flags & UNIT_DIRECTORY_VERSION) &&
983                                     !(ud_child->flags & UNIT_DIRECTORY_VERSION))
984                                 {
985                                         ud_child->flags |=  UNIT_DIRECTORY_VERSION;
986                                         ud_child->version = ud->version;
987                                 }
988                                 
989                                 /* register the child unit */
990                                 ud_child->flags |= UNIT_DIRECTORY_LUN_DIRECTORY;
991                                 nodemgr_register_device(ne, ud_child, &ud->device);
992                         }
993
994                         break;
995
996                 default:
997                         break;
998                 }
999                 last_key_id = kv->key.id;
1000         }
1001         
1002         /* do not process child units here and only if not already registered */
1003         if (!parent && ud->device.bus != &ieee1394_bus_type)
1004                 nodemgr_register_device(ne, ud, &ne->device);
1005
1006         return ud;
1007
1008 unit_directory_error:
1009         kfree(ud);
1010         return NULL;
1011 }
1012
1013
1014 static void nodemgr_process_root_directory(struct host_info *hi, struct node_entry *ne)
1015 {
1016         unsigned int ud_id = 0;
1017         struct csr1212_dentry *dentry;
1018         struct csr1212_keyval *kv;
1019         u8 last_key_id = 0;
1020
1021         ne->needs_probe = 0;
1022
1023         csr1212_for_each_dir_entry(ne->csr, kv, ne->csr->root_kv, dentry) {
1024                 switch (kv->key.id) {
1025                 case CSR1212_KV_ID_VENDOR:
1026                         ne->vendor_id = kv->value.immediate;
1027
1028                         if (ne->vendor_id)
1029                                 ne->vendor_oui = nodemgr_find_oui_name(ne->vendor_id);
1030                         break;
1031
1032                 case CSR1212_KV_ID_NODE_CAPABILITIES:
1033                         ne->capabilities = kv->value.immediate;
1034                         break;
1035
1036                 case CSR1212_KV_ID_UNIT:
1037                         nodemgr_process_unit_directory(hi, ne, kv, &ud_id, NULL);
1038                         break;
1039
1040                 case CSR1212_KV_ID_DESCRIPTOR:
1041                         if (last_key_id == CSR1212_KV_ID_VENDOR) {
1042                                 if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1043                                     CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1044                                     CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1045                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1046                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1047                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1048                                         ne->vendor_name_kv = kv;
1049                                         csr1212_keep_keyval(kv);
1050                                 }
1051                         }
1052                         break;
1053                 }
1054                 last_key_id = kv->key.id;
1055         }
1056
1057         if (ne->vendor_oui)
1058                 device_create_file(&ne->device, &dev_attr_ne_vendor_oui);
1059         if (ne->vendor_name_kv)
1060                 device_create_file(&ne->device, &dev_attr_ne_vendor_name_kv);
1061 }
1062
1063 #ifdef CONFIG_HOTPLUG
1064
1065 static int nodemgr_hotplug(struct class_device *cdev, char **envp, int num_envp,
1066                            char *buffer, int buffer_size)
1067 {
1068         struct unit_directory *ud;
1069         int i = 0;
1070         int length = 0;
1071
1072         if (!cdev)
1073                 return -ENODEV;
1074
1075         ud = container_of(cdev, struct unit_directory, class_dev);
1076
1077         if (ud->ne->in_limbo || ud->ignore_driver)
1078                 return -ENODEV;
1079
1080 #define PUT_ENVP(fmt,val)                                       \
1081 do {                                                            \
1082         int printed;                                            \
1083         envp[i++] = buffer;                                     \
1084         printed = snprintf(buffer, buffer_size - length,        \
1085                            fmt, val);                           \
1086         if ((buffer_size - (length+printed) <= 0) || (i >= num_envp))   \
1087                 return -ENOMEM;                                 \
1088         length += printed+1;                                    \
1089         buffer += printed+1;                                    \
1090 } while (0)
1091
1092         PUT_ENVP("VENDOR_ID=%06x", ud->vendor_id);
1093         PUT_ENVP("MODEL_ID=%06x", ud->model_id);
1094         PUT_ENVP("GUID=%016Lx", (unsigned long long)ud->ne->guid);
1095         PUT_ENVP("SPECIFIER_ID=%06x", ud->specifier_id);
1096         PUT_ENVP("VERSION=%06x", ud->version);
1097
1098 #undef PUT_ENVP
1099
1100         envp[i] = NULL;
1101
1102         return 0;
1103 }
1104
1105 #else
1106
1107 static int nodemgr_hotplug(struct class_device *cdev, char **envp, int num_envp,
1108                            char *buffer, int buffer_size)
1109 {
1110         return -ENODEV;
1111 }
1112
1113 #endif /* CONFIG_HOTPLUG */
1114
1115
1116 int hpsb_register_protocol(struct hpsb_protocol_driver *driver)
1117 {
1118         int ret;
1119
1120         /* This will cause a probe for devices */
1121         ret = driver_register(&driver->driver);
1122         if (!ret)
1123                 nodemgr_create_drv_files(driver);
1124
1125         return ret;
1126 }
1127
1128 void hpsb_unregister_protocol(struct hpsb_protocol_driver *driver)
1129 {
1130         nodemgr_remove_drv_files(driver);
1131         /* This will subsequently disconnect all devices that our driver
1132          * is attached to. */
1133         driver_unregister(&driver->driver);
1134 }
1135
1136
1137 /*
1138  * This function updates nodes that were present on the bus before the
1139  * reset and still are after the reset.  The nodeid and the config rom
1140  * may have changed, and the drivers managing this device must be
1141  * informed that this device just went through a bus reset, to allow
1142  * the to take whatever actions required.
1143  */
1144 static void nodemgr_update_node(struct node_entry *ne, struct csr1212_csr *csr,
1145                                 struct host_info *hi, nodeid_t nodeid,
1146                                 unsigned int generation)
1147 {
1148         if (ne->nodeid != nodeid) {
1149                 HPSB_DEBUG("Node changed: " NODE_BUS_FMT " -> " NODE_BUS_FMT,
1150                            NODE_BUS_ARGS(ne->host, ne->nodeid),
1151                            NODE_BUS_ARGS(ne->host, nodeid));
1152                 ne->nodeid = nodeid;
1153         }
1154
1155         if (ne->busopt.generation != ((be32_to_cpu(csr->bus_info_data[2]) >> 4) & 0xf)) {
1156                 kfree(ne->csr->private);
1157                 csr1212_destroy_csr(ne->csr);
1158                 ne->csr = csr;
1159
1160                 /* If the node's configrom generation has changed, we
1161                  * unregister all the unit directories. */
1162                 nodemgr_remove_uds(ne);
1163
1164                 nodemgr_update_bus_options(ne);
1165
1166                 /* Mark the node as new, so it gets re-probed */
1167                 ne->needs_probe = 1;
1168         } else {
1169                 /* old cache is valid, so update its generation */
1170                 struct nodemgr_csr_info *ci = ne->csr->private;
1171                 ci->generation = generation;
1172                 /* free the partially filled now unneeded new cache */
1173                 kfree(csr->private);
1174                 csr1212_destroy_csr(csr);
1175         }
1176
1177         if (ne->in_limbo)
1178                 nodemgr_resume_ne(ne);
1179
1180         /* Mark the node current */
1181         ne->generation = generation;
1182 }
1183
1184
1185
1186 static void nodemgr_node_scan_one(struct host_info *hi,
1187                                   nodeid_t nodeid, int generation)
1188 {
1189         struct hpsb_host *host = hi->host;
1190         struct node_entry *ne;
1191         octlet_t guid;
1192         struct csr1212_csr *csr;
1193         struct nodemgr_csr_info *ci;
1194
1195         ci = kmalloc(sizeof(struct nodemgr_csr_info), GFP_KERNEL);
1196         if (!ci)
1197                 return;
1198
1199         ci->host = host;
1200         ci->nodeid = nodeid;
1201         ci->generation = generation;
1202
1203         /* We need to detect when the ConfigROM's generation has changed,
1204          * so we only update the node's info when it needs to be.  */
1205
1206         csr = csr1212_create_csr(&nodemgr_csr_ops, 5 * sizeof(quadlet_t), ci);
1207         if (!csr || csr1212_parse_csr(csr) != CSR1212_SUCCESS) {
1208                 HPSB_ERR("Error parsing configrom for node " NODE_BUS_FMT,
1209                          NODE_BUS_ARGS(host, nodeid));
1210                 if (csr)
1211                         csr1212_destroy_csr(csr);
1212                 kfree(ci);
1213                 return;
1214         }
1215
1216         if (csr->bus_info_data[1] != IEEE1394_BUSID_MAGIC) {
1217                 /* This isn't a 1394 device, but we let it slide. There
1218                  * was a report of a device with broken firmware which
1219                  * reported '2394' instead of '1394', which is obviously a
1220                  * mistake. One would hope that a non-1394 device never
1221                  * gets connected to Firewire bus. If someone does, we
1222                  * shouldn't be held responsible, so we'll allow it with a
1223                  * warning.  */
1224                 HPSB_WARN("Node " NODE_BUS_FMT " has invalid busID magic [0x%08x]",
1225                           NODE_BUS_ARGS(host, nodeid), csr->bus_info_data[1]);
1226         }
1227
1228         guid = ((u64)be32_to_cpu(csr->bus_info_data[3]) << 32) | be32_to_cpu(csr->bus_info_data[4]);
1229         ne = find_entry_by_guid(guid);
1230
1231         if (ne && ne->host != host && ne->in_limbo) {
1232                 /* Must have moved this device from one host to another */
1233                 nodemgr_remove_ne(ne);
1234                 ne = NULL;
1235         }
1236
1237         if (!ne)
1238                 nodemgr_create_node(guid, csr, hi, nodeid, generation);
1239         else
1240                 nodemgr_update_node(ne, csr, hi, nodeid, generation);
1241
1242         return;
1243 }
1244
1245
1246 static void nodemgr_node_scan(struct host_info *hi, int generation)
1247 {
1248         int count;
1249         struct hpsb_host *host = hi->host;
1250         struct selfid *sid = (struct selfid *)host->topology_map;
1251         nodeid_t nodeid = LOCAL_BUS;
1252
1253         /* Scan each node on the bus */
1254         for (count = host->selfid_count; count; count--, sid++) {
1255                 if (sid->extended)
1256                         continue;
1257
1258                 if (!sid->link_active) {
1259                         nodeid++;
1260                         continue;
1261                 }
1262                 nodemgr_node_scan_one(hi, nodeid++, generation);
1263         }
1264 }
1265
1266
1267 static void nodemgr_suspend_ne(struct node_entry *ne)
1268 {
1269         struct class_device *cdev;
1270         struct unit_directory *ud;
1271
1272         HPSB_DEBUG("Node suspended: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1273                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1274
1275         ne->in_limbo = 1;
1276         device_create_file(&ne->device, &dev_attr_ne_in_limbo);
1277
1278         down_write(&ne->device.bus->subsys.rwsem);
1279         list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1280                 ud = container_of(cdev, struct unit_directory, class_dev);
1281
1282                 if (ud->ne != ne)
1283                         continue;
1284
1285                 if (ud->device.driver &&
1286                     (!ud->device.driver->suspend ||
1287                       ud->device.driver->suspend(&ud->device, PMSG_SUSPEND, 0)))
1288                         device_release_driver(&ud->device);
1289         }
1290         up_write(&ne->device.bus->subsys.rwsem);
1291 }
1292
1293
1294 static void nodemgr_resume_ne(struct node_entry *ne)
1295 {
1296         struct class_device *cdev;
1297         struct unit_directory *ud;
1298
1299         ne->in_limbo = 0;
1300         device_remove_file(&ne->device, &dev_attr_ne_in_limbo);
1301
1302         down_read(&ne->device.bus->subsys.rwsem);
1303         list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1304                 ud = container_of(cdev, struct unit_directory, class_dev);
1305
1306                 if (ud->ne != ne)
1307                         continue;
1308
1309                 if (ud->device.driver && ud->device.driver->resume)
1310                         ud->device.driver->resume(&ud->device, 0);
1311         }
1312         up_read(&ne->device.bus->subsys.rwsem);
1313
1314         HPSB_DEBUG("Node resumed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1315                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1316 }
1317
1318
1319 static void nodemgr_update_pdrv(struct node_entry *ne)
1320 {
1321         struct unit_directory *ud;
1322         struct hpsb_protocol_driver *pdrv;
1323         struct class *class = &nodemgr_ud_class;
1324         struct class_device *cdev;
1325
1326         down_read(&class->subsys.rwsem);
1327         list_for_each_entry(cdev, &class->children, node) {
1328                 ud = container_of(cdev, struct unit_directory, class_dev);
1329                 if (ud->ne != ne || !ud->device.driver)
1330                         continue;
1331
1332                 pdrv = container_of(ud->device.driver, struct hpsb_protocol_driver, driver);
1333
1334                 if (pdrv->update && pdrv->update(ud)) {
1335                         down_write(&ud->device.bus->subsys.rwsem);
1336                         device_release_driver(&ud->device);
1337                         up_write(&ud->device.bus->subsys.rwsem);
1338                 }
1339         }
1340         up_read(&class->subsys.rwsem);
1341 }
1342
1343
1344 static void nodemgr_probe_ne(struct host_info *hi, struct node_entry *ne, int generation)
1345 {
1346         struct device *dev;
1347
1348         if (ne->host != hi->host || ne->in_limbo)
1349                 return;
1350
1351         dev = get_device(&ne->device);
1352         if (!dev)
1353                 return;
1354
1355         /* If "needs_probe", then this is either a new or changed node we
1356          * rescan totally. If the generation matches for an existing node
1357          * (one that existed prior to the bus reset) we send update calls
1358          * down to the drivers. Otherwise, this is a dead node and we
1359          * suspend it. */
1360         if (ne->needs_probe)
1361                 nodemgr_process_root_directory(hi, ne);
1362         else if (ne->generation == generation)
1363                 nodemgr_update_pdrv(ne);
1364         else
1365                 nodemgr_suspend_ne(ne);
1366
1367         put_device(dev);
1368 }
1369
1370
1371 static void nodemgr_node_probe(struct host_info *hi, int generation)
1372 {
1373         struct hpsb_host *host = hi->host;
1374         struct class *class = &nodemgr_ne_class;
1375         struct class_device *cdev;
1376
1377         /* Do some processing of the nodes we've probed. This pulls them
1378          * into the sysfs layer if needed, and can result in processing of
1379          * unit-directories, or just updating the node and it's
1380          * unit-directories. */
1381         down_read(&class->subsys.rwsem);
1382         list_for_each_entry(cdev, &class->children, node)
1383                 nodemgr_probe_ne(hi, container_of(cdev, struct node_entry, class_dev), generation);
1384         up_read(&class->subsys.rwsem);
1385
1386
1387         /* If we had a bus reset while we were scanning the bus, it is
1388          * possible that we did not probe all nodes.  In that case, we
1389          * skip the clean up for now, since we could remove nodes that
1390          * were still on the bus.  The bus reset increased hi->reset_sem,
1391          * so there's a bus scan pending which will do the clean up
1392          * eventually.
1393          *
1394          * Now let's tell the bus to rescan our devices. This may seem
1395          * like overhead, but the driver-model core will only scan a
1396          * device for a driver when either the device is added, or when a
1397          * new driver is added. A bus reset is a good reason to rescan
1398          * devices that were there before.  For example, an sbp2 device
1399          * may become available for login, if the host that held it was
1400          * just removed.  */
1401
1402         if (generation == get_hpsb_generation(host))
1403                 bus_rescan_devices(&ieee1394_bus_type);
1404
1405         return;
1406 }
1407
1408 /* Because we are a 1394a-2000 compliant IRM, we need to inform all the other
1409  * nodes of the broadcast channel.  (Really we're only setting the validity
1410  * bit). Other IRM responsibilities go in here as well. */
1411 static int nodemgr_do_irm_duties(struct hpsb_host *host, int cycles)
1412 {
1413         quadlet_t bc;
1414
1415         /* if irm_id == -1 then there is no IRM on this bus */
1416         if (!host->is_irm || host->irm_id == (nodeid_t)-1)
1417                 return 1;
1418
1419         host->csr.broadcast_channel |= 0x40000000;  /* set validity bit */
1420
1421         bc = cpu_to_be32(host->csr.broadcast_channel);
1422
1423         hpsb_write(host, LOCAL_BUS | ALL_NODES, get_hpsb_generation(host),
1424                    (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL),
1425                    &bc, sizeof(quadlet_t));
1426
1427         /* If there is no bus manager then we should set the root node's
1428          * force_root bit to promote bus stability per the 1394
1429          * spec. (8.4.2.6) */
1430         if (host->busmgr_id == 0xffff && host->node_count > 1)
1431         {
1432                 u16 root_node = host->node_count - 1;
1433                 struct node_entry *ne = find_entry_by_nodeid(host, root_node | LOCAL_BUS);
1434
1435                 if (ne && ne->busopt.cmc)
1436                         hpsb_send_phy_config(host, root_node, -1);
1437                 else {
1438                         HPSB_DEBUG("The root node is not cycle master capable; "
1439                                    "selecting a new root node and resetting...");
1440
1441                         if (cycles >= 5) {
1442                                 /* Oh screw it! Just leave the bus as it is */
1443                                 HPSB_DEBUG("Stopping reset loop for IRM sanity");
1444                                 return 1;
1445                         }
1446
1447                         hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1448                         hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1449
1450                         return 0;
1451                 }
1452         }
1453
1454         return 1;
1455 }
1456
1457 /* We need to ensure that if we are not the IRM, that the IRM node is capable of
1458  * everything we can do, otherwise issue a bus reset and try to become the IRM
1459  * ourselves. */
1460 static int nodemgr_check_irm_capability(struct hpsb_host *host, int cycles)
1461 {
1462         quadlet_t bc;
1463         int status;
1464
1465         if (hpsb_disable_irm || host->is_irm)
1466                 return 1;
1467
1468         status = hpsb_read(host, LOCAL_BUS | (host->irm_id),
1469                            get_hpsb_generation(host),
1470                            (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL),
1471                            &bc, sizeof(quadlet_t));
1472
1473         if (status < 0 || !(be32_to_cpu(bc) & 0x80000000)) {
1474                 /* The current irm node does not have a valid BROADCAST_CHANNEL
1475                  * register and we do, so reset the bus with force_root set */
1476                 HPSB_DEBUG("Current remote IRM is not 1394a-2000 compliant, resetting...");
1477
1478                 if (cycles >= 5) {
1479                         /* Oh screw it! Just leave the bus as it is */
1480                         HPSB_DEBUG("Stopping reset loop for IRM sanity");
1481                         return 1;
1482                 }
1483
1484                 hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1485                 hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1486
1487                 return 0;
1488         }
1489
1490         return 1;
1491 }
1492
1493 static int nodemgr_host_thread(void *__hi)
1494 {
1495         struct host_info *hi = (struct host_info *)__hi;
1496         struct hpsb_host *host = hi->host;
1497         int reset_cycles = 0;
1498
1499         /* No userlevel access needed */
1500         daemonize(hi->daemon_name);
1501
1502         /* Setup our device-model entries */
1503         nodemgr_create_host_dev_files(host);
1504
1505         /* Sit and wait for a signal to probe the nodes on the bus. This
1506          * happens when we get a bus reset. */
1507         while (1) {
1508                 unsigned int generation = 0;
1509                 int i;
1510
1511                 if (down_interruptible(&hi->reset_sem) ||
1512                     down_interruptible(&nodemgr_serialize)) {
1513                         if (try_to_freeze())
1514                                 continue;
1515                         printk("NodeMgr: received unexpected signal?!\n" );
1516                         break;
1517                 }
1518
1519                 if (hi->kill_me) {
1520                         up(&nodemgr_serialize);
1521                         break;
1522                 }
1523
1524                 /* Pause for 1/4 second in 1/16 second intervals,
1525                  * to make sure things settle down. */
1526                 for (i = 0; i < 4 ; i++) {
1527                         set_current_state(TASK_INTERRUPTIBLE);
1528                         if (msleep_interruptible(63)) {
1529                                 up(&nodemgr_serialize);
1530                                 goto caught_signal;
1531                         }
1532
1533                         /* Now get the generation in which the node ID's we collect
1534                          * are valid.  During the bus scan we will use this generation
1535                          * for the read transactions, so that if another reset occurs
1536                          * during the scan the transactions will fail instead of
1537                          * returning bogus data. */
1538                         generation = get_hpsb_generation(host);
1539
1540                         /* If we get a reset before we are done waiting, then
1541                          * start the the waiting over again */
1542                         while (!down_trylock(&hi->reset_sem))
1543                                 i = 0;
1544
1545                         /* Check the kill_me again */
1546                         if (hi->kill_me) {
1547                                 up(&nodemgr_serialize);
1548                                 goto caught_signal;
1549                         }
1550                 }
1551
1552                 if (!nodemgr_check_irm_capability(host, reset_cycles)) {
1553                         reset_cycles++;
1554                         up(&nodemgr_serialize);
1555                         continue;
1556                 }
1557
1558                 /* Scan our nodes to get the bus options and create node
1559                  * entries. This does not do the sysfs stuff, since that
1560                  * would trigger hotplug callbacks and such, which is a
1561                  * bad idea at this point. */
1562                 nodemgr_node_scan(hi, generation);
1563                 if (!nodemgr_do_irm_duties(host, reset_cycles)) {
1564                         reset_cycles++;
1565                         up(&nodemgr_serialize);
1566                         continue;
1567                 }
1568
1569                 reset_cycles = 0;
1570
1571                 /* This actually does the full probe, with sysfs
1572                  * registration. */
1573                 nodemgr_node_probe(hi, generation);
1574
1575                 /* Update some of our sysfs symlinks */
1576                 nodemgr_update_host_dev_links(host);
1577
1578                 up(&nodemgr_serialize);
1579         }
1580
1581 caught_signal:
1582         HPSB_VERBOSE("NodeMgr: Exiting thread");
1583
1584         complete_and_exit(&hi->exited, 0);
1585 }
1586
1587 int nodemgr_for_each_host(void *__data, int (*cb)(struct hpsb_host *, void *))
1588 {
1589         struct class *class = &hpsb_host_class;
1590         struct class_device *cdev;
1591         struct hpsb_host *host;
1592         int error = 0;
1593
1594         down_read(&class->subsys.rwsem);
1595         list_for_each_entry(cdev, &class->children, node) {
1596                 host = container_of(cdev, struct hpsb_host, class_dev);
1597
1598                 if ((error = cb(host, __data)))
1599                         break;
1600         }
1601         up_read(&class->subsys.rwsem);
1602
1603         return error;
1604 }
1605
1606 /* The following four convenience functions use a struct node_entry
1607  * for addressing a node on the bus.  They are intended for use by any
1608  * process context, not just the nodemgr thread, so we need to be a
1609  * little careful when reading out the node ID and generation.  The
1610  * thing that can go wrong is that we get the node ID, then a bus
1611  * reset occurs, and then we read the generation.  The node ID is
1612  * possibly invalid, but the generation is current, and we end up
1613  * sending a packet to a the wrong node.
1614  *
1615  * The solution is to make sure we read the generation first, so that
1616  * if a reset occurs in the process, we end up with a stale generation
1617  * and the transactions will fail instead of silently using wrong node
1618  * ID's.
1619  */
1620
1621 void hpsb_node_fill_packet(struct node_entry *ne, struct hpsb_packet *pkt)
1622 {
1623         pkt->host = ne->host;
1624         pkt->generation = ne->generation;
1625         barrier();
1626         pkt->node_id = ne->nodeid;
1627 }
1628
1629 int hpsb_node_write(struct node_entry *ne, u64 addr,
1630                     quadlet_t *buffer, size_t length)
1631 {
1632         unsigned int generation = ne->generation;
1633
1634         barrier();
1635         return hpsb_write(ne->host, ne->nodeid, generation,
1636                           addr, buffer, length);
1637 }
1638
1639 static void nodemgr_add_host(struct hpsb_host *host)
1640 {
1641         struct host_info *hi;
1642
1643         hi = hpsb_create_hostinfo(&nodemgr_highlevel, host, sizeof(*hi));
1644
1645         if (!hi) {
1646                 HPSB_ERR ("NodeMgr: out of memory in add host");
1647                 return;
1648         }
1649
1650         hi->host = host;
1651         init_completion(&hi->exited);
1652         sema_init(&hi->reset_sem, 0);
1653
1654         sprintf(hi->daemon_name, "knodemgrd_%d", host->id);
1655
1656         hi->pid = kernel_thread(nodemgr_host_thread, hi, CLONE_KERNEL);
1657
1658         if (hi->pid < 0) {
1659                 HPSB_ERR ("NodeMgr: failed to start %s thread for %s",
1660                           hi->daemon_name, host->driver->name);
1661                 hpsb_destroy_hostinfo(&nodemgr_highlevel, host);
1662                 return;
1663         }
1664
1665         return;
1666 }
1667
1668 static void nodemgr_host_reset(struct hpsb_host *host)
1669 {
1670         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1671
1672         if (hi != NULL) {
1673                 HPSB_VERBOSE("NodeMgr: Processing host reset for %s", hi->daemon_name);
1674                 up(&hi->reset_sem);
1675         } else
1676                 HPSB_ERR ("NodeMgr: could not process reset of unused host");
1677
1678         return;
1679 }
1680
1681 static void nodemgr_remove_host(struct hpsb_host *host)
1682 {
1683         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1684
1685         if (hi) {
1686                 if (hi->pid >= 0) {
1687                         hi->kill_me = 1;
1688                         mb();
1689                         up(&hi->reset_sem);
1690                         wait_for_completion(&hi->exited);
1691                         nodemgr_remove_host_dev(&host->device);
1692                 }
1693         } else
1694                 HPSB_ERR("NodeMgr: host %s does not exist, cannot remove",
1695                          host->driver->name);
1696
1697         return;
1698 }
1699
1700 static struct hpsb_highlevel nodemgr_highlevel = {
1701         .name =         "Node manager",
1702         .add_host =     nodemgr_add_host,
1703         .host_reset =   nodemgr_host_reset,
1704         .remove_host =  nodemgr_remove_host,
1705 };
1706
1707 int init_ieee1394_nodemgr(void)
1708 {
1709         int ret;
1710
1711         ret = class_register(&nodemgr_ne_class);
1712         if (ret < 0)
1713                 return ret;
1714
1715         ret = class_register(&nodemgr_ud_class);
1716         if (ret < 0) {
1717                 class_unregister(&nodemgr_ne_class);
1718                 return ret;
1719         }
1720
1721         hpsb_register_highlevel(&nodemgr_highlevel);
1722
1723         return 0;
1724 }
1725
1726 void cleanup_ieee1394_nodemgr(void)
1727 {
1728         hpsb_unregister_highlevel(&nodemgr_highlevel);
1729
1730         class_unregister(&nodemgr_ud_class);
1731         class_unregister(&nodemgr_ne_class);
1732 }