83e66ed97ab53640480728c816b810e7c67319a5
[linux-3.10.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, 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, 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, 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, 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, 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, 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, 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, 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
699 static void nodemgr_remove_host_dev(struct device *dev)
700 {
701         struct device *ne_dev, *next;
702
703         list_for_each_entry_safe(ne_dev, next, &dev->children, node)
704                 nodemgr_remove_ne(container_of(ne_dev, struct node_entry, device));
705
706         sysfs_remove_link(&dev->kobj, "irm_id");
707         sysfs_remove_link(&dev->kobj, "busmgr_id");
708         sysfs_remove_link(&dev->kobj, "host_id");
709 }
710
711
712 static void nodemgr_update_bus_options(struct node_entry *ne)
713 {
714 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
715         static const u16 mr[] = { 4, 64, 1024, 0};
716 #endif
717         quadlet_t busoptions = be32_to_cpu(ne->csr->bus_info_data[2]);
718
719         ne->busopt.irmc         = (busoptions >> 31) & 1;
720         ne->busopt.cmc          = (busoptions >> 30) & 1;
721         ne->busopt.isc          = (busoptions >> 29) & 1;
722         ne->busopt.bmc          = (busoptions >> 28) & 1;
723         ne->busopt.pmc          = (busoptions >> 27) & 1;
724         ne->busopt.cyc_clk_acc  = (busoptions >> 16) & 0xff;
725         ne->busopt.max_rec      = 1 << (((busoptions >> 12) & 0xf) + 1);
726         ne->busopt.max_rom      = (busoptions >> 8) & 0x3;
727         ne->busopt.generation   = (busoptions >> 4) & 0xf;
728         ne->busopt.lnkspd       = busoptions & 0x7;
729
730         HPSB_VERBOSE("NodeMgr: raw=0x%08x irmc=%d cmc=%d isc=%d bmc=%d pmc=%d "
731                      "cyc_clk_acc=%d max_rec=%d max_rom=%d gen=%d lspd=%d",
732                      busoptions, ne->busopt.irmc, ne->busopt.cmc,
733                      ne->busopt.isc, ne->busopt.bmc, ne->busopt.pmc,
734                      ne->busopt.cyc_clk_acc, ne->busopt.max_rec,
735                      mr[ne->busopt.max_rom],
736                      ne->busopt.generation, ne->busopt.lnkspd);
737 }
738
739
740 static struct node_entry *nodemgr_create_node(octlet_t guid, struct csr1212_csr *csr,
741                                               struct host_info *hi, nodeid_t nodeid,
742                                               unsigned int generation)
743 {
744         struct hpsb_host *host = hi->host;
745         struct node_entry *ne;
746
747         ne = kmalloc(sizeof(struct node_entry), GFP_KERNEL);
748         if (!ne) return NULL;
749
750         memset(ne, 0, sizeof(struct node_entry));
751
752         ne->tpool = &host->tpool[nodeid & NODE_MASK];
753
754         ne->host = host;
755         ne->nodeid = nodeid;
756         ne->generation = generation;
757         ne->needs_probe = 1;
758
759         ne->guid = guid;
760         ne->guid_vendor_id = (guid >> 40) & 0xffffff;
761         ne->guid_vendor_oui = nodemgr_find_oui_name(ne->guid_vendor_id);
762         ne->csr = csr;
763
764         memcpy(&ne->device, &nodemgr_dev_template_ne,
765                sizeof(ne->device));
766         ne->device.parent = &host->device;
767         snprintf(ne->device.bus_id, BUS_ID_SIZE, "%016Lx",
768                  (unsigned long long)(ne->guid));
769
770         ne->class_dev.dev = &ne->device;
771         ne->class_dev.class = &nodemgr_ne_class;
772         snprintf(ne->class_dev.class_id, BUS_ID_SIZE, "%016Lx",
773                  (unsigned long long)(ne->guid));
774
775         device_register(&ne->device);
776         class_device_register(&ne->class_dev);
777         get_device(&ne->device);
778
779         if (ne->guid_vendor_oui)
780                 device_create_file(&ne->device, &dev_attr_ne_guid_vendor_oui);
781         nodemgr_create_ne_dev_files(ne);
782
783         nodemgr_update_bus_options(ne);
784
785         HPSB_DEBUG("%s added: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
786                    (host->node_id == nodeid) ? "Host" : "Node",
787                    NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
788
789         return ne;
790 }
791
792
793 static struct node_entry *find_entry_by_guid(u64 guid)
794 {
795         struct class *class = &nodemgr_ne_class;
796         struct class_device *cdev;
797         struct node_entry *ne, *ret_ne = NULL;
798
799         down_read(&class->subsys.rwsem);
800         list_for_each_entry(cdev, &class->children, node) {
801                 ne = container_of(cdev, struct node_entry, class_dev);
802
803                 if (ne->guid == guid) {
804                         ret_ne = ne;
805                         break;
806                 }
807         }
808         up_read(&class->subsys.rwsem);
809
810         return ret_ne;
811 }
812
813
814 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host, nodeid_t nodeid)
815 {
816         struct class *class = &nodemgr_ne_class;
817         struct class_device *cdev;
818         struct node_entry *ne, *ret_ne = NULL;
819
820         down_read(&class->subsys.rwsem);
821         list_for_each_entry(cdev, &class->children, node) {
822                 ne = container_of(cdev, struct node_entry, class_dev);
823
824                 if (ne->host == host && ne->nodeid == nodeid) {
825                         ret_ne = ne;
826                         break;
827                 }
828         }
829         up_read(&class->subsys.rwsem);
830
831         return ret_ne;
832 }
833
834
835 static void nodemgr_register_device(struct node_entry *ne, 
836         struct unit_directory *ud, struct device *parent)
837 {
838         memcpy(&ud->device, &nodemgr_dev_template_ud,
839                sizeof(ud->device));
840
841         ud->device.parent = parent;
842
843         snprintf(ud->device.bus_id, BUS_ID_SIZE, "%s-%u",
844                  ne->device.bus_id, ud->id);
845
846         ud->class_dev.dev = &ud->device;
847         ud->class_dev.class = &nodemgr_ud_class;
848         snprintf(ud->class_dev.class_id, BUS_ID_SIZE, "%s-%u",
849                  ne->device.bus_id, ud->id);
850
851         device_register(&ud->device);
852         class_device_register(&ud->class_dev);
853         get_device(&ud->device);
854
855         if (ud->vendor_oui)
856                 device_create_file(&ud->device, &dev_attr_ud_vendor_oui);
857         nodemgr_create_ud_dev_files(ud);
858 }       
859
860
861 /* This implementation currently only scans the config rom and its
862  * immediate unit directories looking for software_id and
863  * software_version entries, in order to get driver autoloading working. */
864 static struct unit_directory *nodemgr_process_unit_directory
865         (struct host_info *hi, struct node_entry *ne, struct csr1212_keyval *ud_kv,
866          unsigned int *id, struct unit_directory *parent)
867 {
868         struct unit_directory *ud;
869         struct unit_directory *ud_child = NULL;
870         struct csr1212_dentry *dentry;
871         struct csr1212_keyval *kv;
872         u8 last_key_id = 0;
873
874         ud = kmalloc(sizeof(struct unit_directory), GFP_KERNEL);
875         if (!ud)
876                 goto unit_directory_error;
877
878         memset (ud, 0, sizeof(struct unit_directory));
879
880         ud->ne = ne;
881         ud->ignore_driver = ignore_drivers;
882         ud->address = ud_kv->offset + CSR1212_CONFIG_ROM_SPACE_BASE;
883         ud->ud_kv = ud_kv;
884         ud->id = (*id)++;
885
886         csr1212_for_each_dir_entry(ne->csr, kv, ud_kv, dentry) {
887                 switch (kv->key.id) {
888                 case CSR1212_KV_ID_VENDOR:
889                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
890                                 ud->vendor_id = kv->value.immediate;
891                                 ud->flags |= UNIT_DIRECTORY_VENDOR_ID;
892
893                                 if (ud->vendor_id)
894                                         ud->vendor_oui = nodemgr_find_oui_name(ud->vendor_id);
895                         }
896                         break;
897
898                 case CSR1212_KV_ID_MODEL:
899                         ud->model_id = kv->value.immediate;
900                         ud->flags |= UNIT_DIRECTORY_MODEL_ID;
901                         break;
902
903                 case CSR1212_KV_ID_SPECIFIER_ID:
904                         ud->specifier_id = kv->value.immediate;
905                         ud->flags |= UNIT_DIRECTORY_SPECIFIER_ID;
906                         break;
907
908                 case CSR1212_KV_ID_VERSION:
909                         ud->version = kv->value.immediate;
910                         ud->flags |= UNIT_DIRECTORY_VERSION;
911                         break;
912
913                 case CSR1212_KV_ID_DESCRIPTOR:
914                         if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
915                             CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
916                             CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
917                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
918                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
919                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
920                                 switch (last_key_id) {
921                                 case CSR1212_KV_ID_VENDOR:
922                                         ud->vendor_name_kv = kv;
923                                         csr1212_keep_keyval(kv);
924                                         break;
925
926                                 case CSR1212_KV_ID_MODEL:
927                                         ud->model_name_kv = kv;
928                                         csr1212_keep_keyval(kv);
929                                         break;
930
931                                 }
932                         } /* else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) ... */
933                         break;
934
935                 case CSR1212_KV_ID_DEPENDENT_INFO:
936                         /* Logical Unit Number */
937                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
938                                 if (ud->flags & UNIT_DIRECTORY_HAS_LUN) {
939                                         ud_child = kmalloc(sizeof(struct unit_directory), GFP_KERNEL);
940                                         if (!ud_child)
941                                                 goto unit_directory_error;
942                                         memcpy(ud_child, ud, sizeof(struct unit_directory));
943                                         nodemgr_register_device(ne, ud_child, &ne->device);
944                                         ud_child = NULL;
945                                         
946                                         ud->id = (*id)++;
947                                 }
948                                 ud->lun = kv->value.immediate;
949                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN;
950
951                         /* Logical Unit Directory */
952                         } else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) {
953                                 /* This should really be done in SBP2 as this is
954                                  * doing SBP2 specific parsing.
955                                  */
956                                 
957                                 /* first register the parent unit */
958                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN_DIRECTORY;
959                                 if (ud->device.bus != &ieee1394_bus_type)
960                                         nodemgr_register_device(ne, ud, &ne->device);
961                                 
962                                 /* process the child unit */
963                                 ud_child = nodemgr_process_unit_directory(hi, ne, kv, id, ud);
964
965                                 if (ud_child == NULL)
966                                         break;
967                                 
968                                 /* inherit unspecified values so hotplug picks it up */
969                                 if ((ud->flags & UNIT_DIRECTORY_MODEL_ID) &&
970                                     !(ud_child->flags & UNIT_DIRECTORY_MODEL_ID))
971                                 {
972                                         ud_child->flags |=  UNIT_DIRECTORY_MODEL_ID;
973                                         ud_child->model_id = ud->model_id;
974                                 }
975                                 if ((ud->flags & UNIT_DIRECTORY_SPECIFIER_ID) &&
976                                     !(ud_child->flags & UNIT_DIRECTORY_SPECIFIER_ID))
977                                 {
978                                         ud_child->flags |=  UNIT_DIRECTORY_SPECIFIER_ID;
979                                         ud_child->specifier_id = ud->specifier_id;
980                                 }
981                                 if ((ud->flags & UNIT_DIRECTORY_VERSION) &&
982                                     !(ud_child->flags & UNIT_DIRECTORY_VERSION))
983                                 {
984                                         ud_child->flags |=  UNIT_DIRECTORY_VERSION;
985                                         ud_child->version = ud->version;
986                                 }
987                                 
988                                 /* register the child unit */
989                                 ud_child->flags |= UNIT_DIRECTORY_LUN_DIRECTORY;
990                                 nodemgr_register_device(ne, ud_child, &ud->device);
991                         }
992
993                         break;
994
995                 default:
996                         break;
997                 }
998                 last_key_id = kv->key.id;
999         }
1000         
1001         /* do not process child units here and only if not already registered */
1002         if (!parent && ud->device.bus != &ieee1394_bus_type)
1003                 nodemgr_register_device(ne, ud, &ne->device);
1004
1005         return ud;
1006
1007 unit_directory_error:
1008         kfree(ud);
1009         return NULL;
1010 }
1011
1012
1013 static void nodemgr_process_root_directory(struct host_info *hi, struct node_entry *ne)
1014 {
1015         unsigned int ud_id = 0;
1016         struct csr1212_dentry *dentry;
1017         struct csr1212_keyval *kv;
1018         u8 last_key_id = 0;
1019
1020         ne->needs_probe = 0;
1021
1022         csr1212_for_each_dir_entry(ne->csr, kv, ne->csr->root_kv, dentry) {
1023                 switch (kv->key.id) {
1024                 case CSR1212_KV_ID_VENDOR:
1025                         ne->vendor_id = kv->value.immediate;
1026
1027                         if (ne->vendor_id)
1028                                 ne->vendor_oui = nodemgr_find_oui_name(ne->vendor_id);
1029                         break;
1030
1031                 case CSR1212_KV_ID_NODE_CAPABILITIES:
1032                         ne->capabilities = kv->value.immediate;
1033                         break;
1034
1035                 case CSR1212_KV_ID_UNIT:
1036                         nodemgr_process_unit_directory(hi, ne, kv, &ud_id, NULL);
1037                         break;
1038
1039                 case CSR1212_KV_ID_DESCRIPTOR:
1040                         if (last_key_id == CSR1212_KV_ID_VENDOR) {
1041                                 if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1042                                     CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1043                                     CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1044                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1045                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1046                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1047                                         ne->vendor_name_kv = kv;
1048                                         csr1212_keep_keyval(kv);
1049                                 }
1050                         }
1051                         break;
1052                 }
1053                 last_key_id = kv->key.id;
1054         }
1055
1056         if (ne->vendor_oui)
1057                 device_create_file(&ne->device, &dev_attr_ne_vendor_oui);
1058         if (ne->vendor_name_kv)
1059                 device_create_file(&ne->device, &dev_attr_ne_vendor_name_kv);
1060 }
1061
1062 #ifdef CONFIG_HOTPLUG
1063
1064 static int nodemgr_hotplug(struct class_device *cdev, char **envp, int num_envp,
1065                            char *buffer, int buffer_size)
1066 {
1067         struct unit_directory *ud;
1068         int i = 0;
1069         int length = 0;
1070
1071         if (!cdev)
1072                 return -ENODEV;
1073
1074         ud = container_of(cdev, struct unit_directory, class_dev);
1075
1076         if (ud->ne->in_limbo || ud->ignore_driver)
1077                 return -ENODEV;
1078
1079 #define PUT_ENVP(fmt,val)                                       \
1080 do {                                                            \
1081         int printed;                                            \
1082         envp[i++] = buffer;                                     \
1083         printed = snprintf(buffer, buffer_size - length,        \
1084                            fmt, val);                           \
1085         if ((buffer_size - (length+printed) <= 0) || (i >= num_envp))   \
1086                 return -ENOMEM;                                 \
1087         length += printed+1;                                    \
1088         buffer += printed+1;                                    \
1089 } while (0)
1090
1091         PUT_ENVP("VENDOR_ID=%06x", ud->vendor_id);
1092         PUT_ENVP("MODEL_ID=%06x", ud->model_id);
1093         PUT_ENVP("GUID=%016Lx", (unsigned long long)ud->ne->guid);
1094         PUT_ENVP("SPECIFIER_ID=%06x", ud->specifier_id);
1095         PUT_ENVP("VERSION=%06x", ud->version);
1096
1097 #undef PUT_ENVP
1098
1099         envp[i] = NULL;
1100
1101         return 0;
1102 }
1103
1104 #else
1105
1106 static int nodemgr_hotplug(struct class_device *cdev, char **envp, int num_envp,
1107                            char *buffer, int buffer_size)
1108 {
1109         return -ENODEV;
1110 }
1111
1112 #endif /* CONFIG_HOTPLUG */
1113
1114
1115 int hpsb_register_protocol(struct hpsb_protocol_driver *driver)
1116 {
1117         int ret;
1118
1119         /* This will cause a probe for devices */
1120         ret = driver_register(&driver->driver);
1121         if (!ret)
1122                 nodemgr_create_drv_files(driver);
1123
1124         return ret;
1125 }
1126
1127 void hpsb_unregister_protocol(struct hpsb_protocol_driver *driver)
1128 {
1129         nodemgr_remove_drv_files(driver);
1130         /* This will subsequently disconnect all devices that our driver
1131          * is attached to. */
1132         driver_unregister(&driver->driver);
1133 }
1134
1135
1136 /*
1137  * This function updates nodes that were present on the bus before the
1138  * reset and still are after the reset.  The nodeid and the config rom
1139  * may have changed, and the drivers managing this device must be
1140  * informed that this device just went through a bus reset, to allow
1141  * the to take whatever actions required.
1142  */
1143 static void nodemgr_update_node(struct node_entry *ne, struct csr1212_csr *csr,
1144                                 struct host_info *hi, nodeid_t nodeid,
1145                                 unsigned int generation)
1146 {
1147         if (ne->nodeid != nodeid) {
1148                 HPSB_DEBUG("Node changed: " NODE_BUS_FMT " -> " NODE_BUS_FMT,
1149                            NODE_BUS_ARGS(ne->host, ne->nodeid),
1150                            NODE_BUS_ARGS(ne->host, nodeid));
1151                 ne->nodeid = nodeid;
1152         }
1153
1154         if (ne->busopt.generation != ((be32_to_cpu(csr->bus_info_data[2]) >> 4) & 0xf)) {
1155                 kfree(ne->csr->private);
1156                 csr1212_destroy_csr(ne->csr);
1157                 ne->csr = csr;
1158
1159                 /* If the node's configrom generation has changed, we
1160                  * unregister all the unit directories. */
1161                 nodemgr_remove_uds(ne);
1162
1163                 nodemgr_update_bus_options(ne);
1164
1165                 /* Mark the node as new, so it gets re-probed */
1166                 ne->needs_probe = 1;
1167         } else {
1168                 /* old cache is valid, so update its generation */
1169                 struct nodemgr_csr_info *ci = ne->csr->private;
1170                 ci->generation = generation;
1171                 /* free the partially filled now unneeded new cache */
1172                 kfree(csr->private);
1173                 csr1212_destroy_csr(csr);
1174         }
1175
1176         if (ne->in_limbo)
1177                 nodemgr_resume_ne(ne);
1178
1179         /* Mark the node current */
1180         ne->generation = generation;
1181 }
1182
1183
1184
1185 static void nodemgr_node_scan_one(struct host_info *hi,
1186                                   nodeid_t nodeid, int generation)
1187 {
1188         struct hpsb_host *host = hi->host;
1189         struct node_entry *ne;
1190         octlet_t guid;
1191         struct csr1212_csr *csr;
1192         struct nodemgr_csr_info *ci;
1193
1194         ci = kmalloc(sizeof(struct nodemgr_csr_info), GFP_KERNEL);
1195         if (!ci)
1196                 return;
1197
1198         ci->host = host;
1199         ci->nodeid = nodeid;
1200         ci->generation = generation;
1201
1202         /* We need to detect when the ConfigROM's generation has changed,
1203          * so we only update the node's info when it needs to be.  */
1204
1205         csr = csr1212_create_csr(&nodemgr_csr_ops, 5 * sizeof(quadlet_t), ci);
1206         if (!csr || csr1212_parse_csr(csr) != CSR1212_SUCCESS) {
1207                 HPSB_ERR("Error parsing configrom for node " NODE_BUS_FMT,
1208                          NODE_BUS_ARGS(host, nodeid));
1209                 if (csr)
1210                         csr1212_destroy_csr(csr);
1211                 kfree(ci);
1212                 return;
1213         }
1214
1215         if (csr->bus_info_data[1] != IEEE1394_BUSID_MAGIC) {
1216                 /* This isn't a 1394 device, but we let it slide. There
1217                  * was a report of a device with broken firmware which
1218                  * reported '2394' instead of '1394', which is obviously a
1219                  * mistake. One would hope that a non-1394 device never
1220                  * gets connected to Firewire bus. If someone does, we
1221                  * shouldn't be held responsible, so we'll allow it with a
1222                  * warning.  */
1223                 HPSB_WARN("Node " NODE_BUS_FMT " has invalid busID magic [0x%08x]",
1224                           NODE_BUS_ARGS(host, nodeid), csr->bus_info_data[1]);
1225         }
1226
1227         guid = ((u64)be32_to_cpu(csr->bus_info_data[3]) << 32) | be32_to_cpu(csr->bus_info_data[4]);
1228         ne = find_entry_by_guid(guid);
1229
1230         if (ne && ne->host != host && ne->in_limbo) {
1231                 /* Must have moved this device from one host to another */
1232                 nodemgr_remove_ne(ne);
1233                 ne = NULL;
1234         }
1235
1236         if (!ne)
1237                 nodemgr_create_node(guid, csr, hi, nodeid, generation);
1238         else
1239                 nodemgr_update_node(ne, csr, hi, nodeid, generation);
1240
1241         return;
1242 }
1243
1244
1245 static void nodemgr_node_scan(struct host_info *hi, int generation)
1246 {
1247         int count;
1248         struct hpsb_host *host = hi->host;
1249         struct selfid *sid = (struct selfid *)host->topology_map;
1250         nodeid_t nodeid = LOCAL_BUS;
1251
1252         /* Scan each node on the bus */
1253         for (count = host->selfid_count; count; count--, sid++) {
1254                 if (sid->extended)
1255                         continue;
1256
1257                 if (!sid->link_active) {
1258                         nodeid++;
1259                         continue;
1260                 }
1261                 nodemgr_node_scan_one(hi, nodeid++, generation);
1262         }
1263 }
1264
1265
1266 static void nodemgr_suspend_ne(struct node_entry *ne)
1267 {
1268         struct class_device *cdev;
1269         struct unit_directory *ud;
1270
1271         HPSB_DEBUG("Node suspended: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1272                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1273
1274         ne->in_limbo = 1;
1275         device_create_file(&ne->device, &dev_attr_ne_in_limbo);
1276
1277         down_write(&ne->device.bus->subsys.rwsem);
1278         list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1279                 ud = container_of(cdev, struct unit_directory, class_dev);
1280
1281                 if (ud->ne != ne)
1282                         continue;
1283
1284                 if (ud->device.driver &&
1285                     (!ud->device.driver->suspend ||
1286                       ud->device.driver->suspend(&ud->device, PMSG_SUSPEND, 0)))
1287                         device_release_driver(&ud->device);
1288         }
1289         up_write(&ne->device.bus->subsys.rwsem);
1290 }
1291
1292
1293 static void nodemgr_resume_ne(struct node_entry *ne)
1294 {
1295         struct class_device *cdev;
1296         struct unit_directory *ud;
1297
1298         ne->in_limbo = 0;
1299         device_remove_file(&ne->device, &dev_attr_ne_in_limbo);
1300
1301         down_read(&ne->device.bus->subsys.rwsem);
1302         list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1303                 ud = container_of(cdev, struct unit_directory, class_dev);
1304
1305                 if (ud->ne != ne)
1306                         continue;
1307
1308                 if (ud->device.driver && ud->device.driver->resume)
1309                         ud->device.driver->resume(&ud->device, 0);
1310         }
1311         up_read(&ne->device.bus->subsys.rwsem);
1312
1313         HPSB_DEBUG("Node resumed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1314                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1315 }
1316
1317
1318 static void nodemgr_update_pdrv(struct node_entry *ne)
1319 {
1320         struct unit_directory *ud;
1321         struct hpsb_protocol_driver *pdrv;
1322         struct class *class = &nodemgr_ud_class;
1323         struct class_device *cdev;
1324
1325         down_read(&class->subsys.rwsem);
1326         list_for_each_entry(cdev, &class->children, node) {
1327                 ud = container_of(cdev, struct unit_directory, class_dev);
1328                 if (ud->ne != ne || !ud->device.driver)
1329                         continue;
1330
1331                 pdrv = container_of(ud->device.driver, struct hpsb_protocol_driver, driver);
1332
1333                 if (pdrv->update && pdrv->update(ud)) {
1334                         down_write(&ud->device.bus->subsys.rwsem);
1335                         device_release_driver(&ud->device);
1336                         up_write(&ud->device.bus->subsys.rwsem);
1337                 }
1338         }
1339         up_read(&class->subsys.rwsem);
1340 }
1341
1342
1343 static void nodemgr_probe_ne(struct host_info *hi, struct node_entry *ne, int generation)
1344 {
1345         struct device *dev;
1346
1347         if (ne->host != hi->host || ne->in_limbo)
1348                 return;
1349
1350         dev = get_device(&ne->device);
1351         if (!dev)
1352                 return;
1353
1354         /* If "needs_probe", then this is either a new or changed node we
1355          * rescan totally. If the generation matches for an existing node
1356          * (one that existed prior to the bus reset) we send update calls
1357          * down to the drivers. Otherwise, this is a dead node and we
1358          * suspend it. */
1359         if (ne->needs_probe)
1360                 nodemgr_process_root_directory(hi, ne);
1361         else if (ne->generation == generation)
1362                 nodemgr_update_pdrv(ne);
1363         else
1364                 nodemgr_suspend_ne(ne);
1365
1366         put_device(dev);
1367 }
1368
1369
1370 static void nodemgr_node_probe(struct host_info *hi, int generation)
1371 {
1372         struct hpsb_host *host = hi->host;
1373         struct class *class = &nodemgr_ne_class;
1374         struct class_device *cdev;
1375
1376         /* Do some processing of the nodes we've probed. This pulls them
1377          * into the sysfs layer if needed, and can result in processing of
1378          * unit-directories, or just updating the node and it's
1379          * unit-directories. */
1380         down_read(&class->subsys.rwsem);
1381         list_for_each_entry(cdev, &class->children, node)
1382                 nodemgr_probe_ne(hi, container_of(cdev, struct node_entry, class_dev), generation);
1383         up_read(&class->subsys.rwsem);
1384
1385
1386         /* If we had a bus reset while we were scanning the bus, it is
1387          * possible that we did not probe all nodes.  In that case, we
1388          * skip the clean up for now, since we could remove nodes that
1389          * were still on the bus.  The bus reset increased hi->reset_sem,
1390          * so there's a bus scan pending which will do the clean up
1391          * eventually.
1392          *
1393          * Now let's tell the bus to rescan our devices. This may seem
1394          * like overhead, but the driver-model core will only scan a
1395          * device for a driver when either the device is added, or when a
1396          * new driver is added. A bus reset is a good reason to rescan
1397          * devices that were there before.  For example, an sbp2 device
1398          * may become available for login, if the host that held it was
1399          * just removed.  */
1400
1401         if (generation == get_hpsb_generation(host))
1402                 bus_rescan_devices(&ieee1394_bus_type);
1403
1404         return;
1405 }
1406
1407 /* Because we are a 1394a-2000 compliant IRM, we need to inform all the other
1408  * nodes of the broadcast channel.  (Really we're only setting the validity
1409  * bit). Other IRM responsibilities go in here as well. */
1410 static int nodemgr_do_irm_duties(struct hpsb_host *host, int cycles)
1411 {
1412         quadlet_t bc;
1413
1414         /* if irm_id == -1 then there is no IRM on this bus */
1415         if (!host->is_irm || host->irm_id == (nodeid_t)-1)
1416                 return 1;
1417
1418         host->csr.broadcast_channel |= 0x40000000;  /* set validity bit */
1419
1420         bc = cpu_to_be32(host->csr.broadcast_channel);
1421
1422         hpsb_write(host, LOCAL_BUS | ALL_NODES, get_hpsb_generation(host),
1423                    (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL),
1424                    &bc, sizeof(quadlet_t));
1425
1426         /* If there is no bus manager then we should set the root node's
1427          * force_root bit to promote bus stability per the 1394
1428          * spec. (8.4.2.6) */
1429         if (host->busmgr_id == 0xffff && host->node_count > 1)
1430         {
1431                 u16 root_node = host->node_count - 1;
1432                 struct node_entry *ne = find_entry_by_nodeid(host, root_node | LOCAL_BUS);
1433
1434                 if (ne && ne->busopt.cmc)
1435                         hpsb_send_phy_config(host, root_node, -1);
1436                 else {
1437                         HPSB_DEBUG("The root node is not cycle master capable; "
1438                                    "selecting a new root node and resetting...");
1439
1440                         if (cycles >= 5) {
1441                                 /* Oh screw it! Just leave the bus as it is */
1442                                 HPSB_DEBUG("Stopping reset loop for IRM sanity");
1443                                 return 1;
1444                         }
1445
1446                         hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1447                         hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1448
1449                         return 0;
1450                 }
1451         }
1452
1453         return 1;
1454 }
1455
1456 /* We need to ensure that if we are not the IRM, that the IRM node is capable of
1457  * everything we can do, otherwise issue a bus reset and try to become the IRM
1458  * ourselves. */
1459 static int nodemgr_check_irm_capability(struct hpsb_host *host, int cycles)
1460 {
1461         quadlet_t bc;
1462         int status;
1463
1464         if (hpsb_disable_irm || host->is_irm)
1465                 return 1;
1466
1467         status = hpsb_read(host, LOCAL_BUS | (host->irm_id),
1468                            get_hpsb_generation(host),
1469                            (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL),
1470                            &bc, sizeof(quadlet_t));
1471
1472         if (status < 0 || !(be32_to_cpu(bc) & 0x80000000)) {
1473                 /* The current irm node does not have a valid BROADCAST_CHANNEL
1474                  * register and we do, so reset the bus with force_root set */
1475                 HPSB_DEBUG("Current remote IRM is not 1394a-2000 compliant, resetting...");
1476
1477                 if (cycles >= 5) {
1478                         /* Oh screw it! Just leave the bus as it is */
1479                         HPSB_DEBUG("Stopping reset loop for IRM sanity");
1480                         return 1;
1481                 }
1482
1483                 hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1484                 hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1485
1486                 return 0;
1487         }
1488
1489         return 1;
1490 }
1491
1492 static int nodemgr_host_thread(void *__hi)
1493 {
1494         struct host_info *hi = (struct host_info *)__hi;
1495         struct hpsb_host *host = hi->host;
1496         int reset_cycles = 0;
1497
1498         /* No userlevel access needed */
1499         daemonize(hi->daemon_name);
1500
1501         /* Setup our device-model entries */
1502         nodemgr_create_host_dev_files(host);
1503
1504         /* Sit and wait for a signal to probe the nodes on the bus. This
1505          * happens when we get a bus reset. */
1506         while (1) {
1507                 unsigned int generation = 0;
1508                 int i;
1509
1510                 if (down_interruptible(&hi->reset_sem) ||
1511                     down_interruptible(&nodemgr_serialize)) {
1512                         if (try_to_freeze(PF_FREEZE))
1513                                 continue;
1514                         printk("NodeMgr: received unexpected signal?!\n" );
1515                         break;
1516                 }
1517
1518                 if (hi->kill_me) {
1519                         up(&nodemgr_serialize);
1520                         break;
1521                 }
1522
1523                 /* Pause for 1/4 second in 1/16 second intervals,
1524                  * to make sure things settle down. */
1525                 for (i = 0; i < 4 ; i++) {
1526                         set_current_state(TASK_INTERRUPTIBLE);
1527                         if (msleep_interruptible(63)) {
1528                                 up(&nodemgr_serialize);
1529                                 goto caught_signal;
1530                         }
1531
1532                         /* Now get the generation in which the node ID's we collect
1533                          * are valid.  During the bus scan we will use this generation
1534                          * for the read transactions, so that if another reset occurs
1535                          * during the scan the transactions will fail instead of
1536                          * returning bogus data. */
1537                         generation = get_hpsb_generation(host);
1538
1539                         /* If we get a reset before we are done waiting, then
1540                          * start the the waiting over again */
1541                         while (!down_trylock(&hi->reset_sem))
1542                                 i = 0;
1543
1544                         /* Check the kill_me again */
1545                         if (hi->kill_me) {
1546                                 up(&nodemgr_serialize);
1547                                 goto caught_signal;
1548                         }
1549                 }
1550
1551                 if (!nodemgr_check_irm_capability(host, reset_cycles)) {
1552                         reset_cycles++;
1553                         up(&nodemgr_serialize);
1554                         continue;
1555                 }
1556
1557                 /* Scan our nodes to get the bus options and create node
1558                  * entries. This does not do the sysfs stuff, since that
1559                  * would trigger hotplug callbacks and such, which is a
1560                  * bad idea at this point. */
1561                 nodemgr_node_scan(hi, generation);
1562                 if (!nodemgr_do_irm_duties(host, reset_cycles)) {
1563                         reset_cycles++;
1564                         up(&nodemgr_serialize);
1565                         continue;
1566                 }
1567
1568                 reset_cycles = 0;
1569
1570                 /* This actually does the full probe, with sysfs
1571                  * registration. */
1572                 nodemgr_node_probe(hi, generation);
1573
1574                 /* Update some of our sysfs symlinks */
1575                 nodemgr_update_host_dev_links(host);
1576
1577                 up(&nodemgr_serialize);
1578         }
1579
1580 caught_signal:
1581         HPSB_VERBOSE("NodeMgr: Exiting thread");
1582
1583         complete_and_exit(&hi->exited, 0);
1584 }
1585
1586 int nodemgr_for_each_host(void *__data, int (*cb)(struct hpsb_host *, void *))
1587 {
1588         struct class *class = &hpsb_host_class;
1589         struct class_device *cdev;
1590         struct hpsb_host *host;
1591         int error = 0;
1592
1593         down_read(&class->subsys.rwsem);
1594         list_for_each_entry(cdev, &class->children, node) {
1595                 host = container_of(cdev, struct hpsb_host, class_dev);
1596
1597                 if ((error = cb(host, __data)))
1598                         break;
1599         }
1600         up_read(&class->subsys.rwsem);
1601
1602         return error;
1603 }
1604
1605 /* The following four convenience functions use a struct node_entry
1606  * for addressing a node on the bus.  They are intended for use by any
1607  * process context, not just the nodemgr thread, so we need to be a
1608  * little careful when reading out the node ID and generation.  The
1609  * thing that can go wrong is that we get the node ID, then a bus
1610  * reset occurs, and then we read the generation.  The node ID is
1611  * possibly invalid, but the generation is current, and we end up
1612  * sending a packet to a the wrong node.
1613  *
1614  * The solution is to make sure we read the generation first, so that
1615  * if a reset occurs in the process, we end up with a stale generation
1616  * and the transactions will fail instead of silently using wrong node
1617  * ID's.
1618  */
1619
1620 void hpsb_node_fill_packet(struct node_entry *ne, struct hpsb_packet *pkt)
1621 {
1622         pkt->host = ne->host;
1623         pkt->generation = ne->generation;
1624         barrier();
1625         pkt->node_id = ne->nodeid;
1626 }
1627
1628 int hpsb_node_write(struct node_entry *ne, u64 addr,
1629                     quadlet_t *buffer, size_t length)
1630 {
1631         unsigned int generation = ne->generation;
1632
1633         barrier();
1634         return hpsb_write(ne->host, ne->nodeid, generation,
1635                           addr, buffer, length);
1636 }
1637
1638 static void nodemgr_add_host(struct hpsb_host *host)
1639 {
1640         struct host_info *hi;
1641
1642         hi = hpsb_create_hostinfo(&nodemgr_highlevel, host, sizeof(*hi));
1643
1644         if (!hi) {
1645                 HPSB_ERR ("NodeMgr: out of memory in add host");
1646                 return;
1647         }
1648
1649         hi->host = host;
1650         init_completion(&hi->exited);
1651         sema_init(&hi->reset_sem, 0);
1652
1653         sprintf(hi->daemon_name, "knodemgrd_%d", host->id);
1654
1655         hi->pid = kernel_thread(nodemgr_host_thread, hi, CLONE_KERNEL);
1656
1657         if (hi->pid < 0) {
1658                 HPSB_ERR ("NodeMgr: failed to start %s thread for %s",
1659                           hi->daemon_name, host->driver->name);
1660                 hpsb_destroy_hostinfo(&nodemgr_highlevel, host);
1661                 return;
1662         }
1663
1664         return;
1665 }
1666
1667 static void nodemgr_host_reset(struct hpsb_host *host)
1668 {
1669         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1670
1671         if (hi != NULL) {
1672                 HPSB_VERBOSE("NodeMgr: Processing host reset for %s", hi->daemon_name);
1673                 up(&hi->reset_sem);
1674         } else
1675                 HPSB_ERR ("NodeMgr: could not process reset of unused host");
1676
1677         return;
1678 }
1679
1680 static void nodemgr_remove_host(struct hpsb_host *host)
1681 {
1682         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1683
1684         if (hi) {
1685                 if (hi->pid >= 0) {
1686                         hi->kill_me = 1;
1687                         mb();
1688                         up(&hi->reset_sem);
1689                         wait_for_completion(&hi->exited);
1690                         nodemgr_remove_host_dev(&host->device);
1691                 }
1692         } else
1693                 HPSB_ERR("NodeMgr: host %s does not exist, cannot remove",
1694                          host->driver->name);
1695
1696         return;
1697 }
1698
1699 static struct hpsb_highlevel nodemgr_highlevel = {
1700         .name =         "Node manager",
1701         .add_host =     nodemgr_add_host,
1702         .host_reset =   nodemgr_host_reset,
1703         .remove_host =  nodemgr_remove_host,
1704 };
1705
1706 int init_ieee1394_nodemgr(void)
1707 {
1708         int ret;
1709
1710         ret = class_register(&nodemgr_ne_class);
1711         if (ret < 0)
1712                 return ret;
1713
1714         ret = class_register(&nodemgr_ud_class);
1715         if (ret < 0) {
1716                 class_unregister(&nodemgr_ne_class);
1717                 return ret;
1718         }
1719
1720         hpsb_register_highlevel(&nodemgr_highlevel);
1721
1722         return 0;
1723 }
1724
1725 void cleanup_ieee1394_nodemgr(void)
1726 {
1727         hpsb_unregister_highlevel(&nodemgr_highlevel);
1728
1729         class_unregister(&nodemgr_ud_class);
1730         class_unregister(&nodemgr_ne_class);
1731 }