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ieee1394: nodemgr: reflect which return values are errors
[mirror_ubuntu-bionic-kernel.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/bitmap.h>
12 #include <linux/kernel.h>
13 #include <linux/list.h>
14 #include <linux/slab.h>
15 #include <linux/delay.h>
16 #include <linux/kthread.h>
17 #include <linux/moduleparam.h>
18 #include <linux/freezer.h>
19 #include <asm/atomic.h>
20
21 #include "csr.h"
22 #include "highlevel.h"
23 #include "hosts.h"
24 #include "ieee1394.h"
25 #include "ieee1394_core.h"
26 #include "ieee1394_hotplug.h"
27 #include "ieee1394_types.h"
28 #include "ieee1394_transactions.h"
29 #include "nodemgr.h"
30
31 static int ignore_drivers;
32 module_param(ignore_drivers, int, S_IRUGO | S_IWUSR);
33 MODULE_PARM_DESC(ignore_drivers, "Disable automatic probing for drivers.");
34
35 struct nodemgr_csr_info {
36 struct hpsb_host *host;
37 nodeid_t nodeid;
38 unsigned int generation;
39 unsigned int speed_unverified:1;
40 };
41
42
43 static char *nodemgr_find_oui_name(int oui)
44 {
45 #ifdef CONFIG_IEEE1394_OUI_DB
46 extern struct oui_list_struct {
47 int oui;
48 char *name;
49 } oui_list[];
50 int i;
51
52 for (i = 0; oui_list[i].name; i++)
53 if (oui_list[i].oui == oui)
54 return oui_list[i].name;
55 #endif
56 return NULL;
57 }
58
59 /*
60 * Correct the speed map entry. This is necessary
61 * - for nodes with link speed < phy speed,
62 * - for 1394b nodes with negotiated phy port speed < IEEE1394_SPEED_MAX.
63 * A possible speed is determined by trial and error, using quadlet reads.
64 */
65 static int nodemgr_check_speed(struct nodemgr_csr_info *ci, u64 addr,
66 quadlet_t *buffer)
67 {
68 quadlet_t q;
69 u8 i, *speed, old_speed, good_speed;
70 int error;
71
72 speed = &(ci->host->speed[NODEID_TO_NODE(ci->nodeid)]);
73 old_speed = *speed;
74 good_speed = IEEE1394_SPEED_MAX + 1;
75
76 /* Try every speed from S100 to old_speed.
77 * If we did it the other way around, a too low speed could be caught
78 * if the retry succeeded for some other reason, e.g. because the link
79 * just finished its initialization. */
80 for (i = IEEE1394_SPEED_100; i <= old_speed; i++) {
81 *speed = i;
82 error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
83 &q, sizeof(quadlet_t));
84 if (error)
85 break;
86 *buffer = q;
87 good_speed = i;
88 }
89 if (good_speed <= IEEE1394_SPEED_MAX) {
90 HPSB_DEBUG("Speed probe of node " NODE_BUS_FMT " yields %s",
91 NODE_BUS_ARGS(ci->host, ci->nodeid),
92 hpsb_speedto_str[good_speed]);
93 *speed = good_speed;
94 ci->speed_unverified = 0;
95 return 0;
96 }
97 *speed = old_speed;
98 return error;
99 }
100
101 static int nodemgr_bus_read(struct csr1212_csr *csr, u64 addr, u16 length,
102 void *buffer, void *__ci)
103 {
104 struct nodemgr_csr_info *ci = (struct nodemgr_csr_info*)__ci;
105 int i, error;
106
107 for (i = 1; ; i++) {
108 error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
109 buffer, length);
110 if (!error) {
111 ci->speed_unverified = 0;
112 break;
113 }
114 /* Give up after 3rd failure. */
115 if (i == 3)
116 break;
117
118 /* The ieee1394_core guessed the node's speed capability from
119 * the self ID. Check whether a lower speed works. */
120 if (ci->speed_unverified && length == sizeof(quadlet_t)) {
121 error = nodemgr_check_speed(ci, addr, buffer);
122 if (!error)
123 break;
124 }
125 if (msleep_interruptible(334))
126 return -EINTR;
127 }
128 return error;
129 }
130
131 static int nodemgr_get_max_rom(quadlet_t *bus_info_data, void *__ci)
132 {
133 return (CSR1212_BE32_TO_CPU(bus_info_data[2]) >> 8) & 0x3;
134 }
135
136 static struct csr1212_bus_ops nodemgr_csr_ops = {
137 .bus_read = nodemgr_bus_read,
138 .get_max_rom = nodemgr_get_max_rom
139 };
140
141
142 /*
143 * Basically what we do here is start off retrieving the bus_info block.
144 * From there will fill in some info about the node, verify it is of IEEE
145 * 1394 type, and that the crc checks out ok. After that we start off with
146 * the root directory, and subdirectories. To do this, we retrieve the
147 * quadlet header for a directory, find out the length, and retrieve the
148 * complete directory entry (be it a leaf or a directory). We then process
149 * it and add the info to our structure for that particular node.
150 *
151 * We verify CRC's along the way for each directory/block/leaf. The entire
152 * node structure is generic, and simply stores the information in a way
153 * that's easy to parse by the protocol interface.
154 */
155
156 /*
157 * The nodemgr relies heavily on the Driver Model for device callbacks and
158 * driver/device mappings. The old nodemgr used to handle all this itself,
159 * but now we are much simpler because of the LDM.
160 */
161
162 static DEFINE_MUTEX(nodemgr_serialize);
163
164 struct host_info {
165 struct hpsb_host *host;
166 struct list_head list;
167 struct task_struct *thread;
168 };
169
170 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv);
171 static int nodemgr_uevent(struct class_device *cdev, char **envp, int num_envp,
172 char *buffer, int buffer_size);
173 static void nodemgr_resume_ne(struct node_entry *ne);
174 static void nodemgr_remove_ne(struct node_entry *ne);
175 static struct node_entry *find_entry_by_guid(u64 guid);
176
177 struct bus_type ieee1394_bus_type = {
178 .name = "ieee1394",
179 .match = nodemgr_bus_match,
180 };
181
182 static void host_cls_release(struct class_device *class_dev)
183 {
184 put_device(&container_of((class_dev), struct hpsb_host, class_dev)->device);
185 }
186
187 struct class hpsb_host_class = {
188 .name = "ieee1394_host",
189 .release = host_cls_release,
190 };
191
192 static void ne_cls_release(struct class_device *class_dev)
193 {
194 put_device(&container_of((class_dev), struct node_entry, class_dev)->device);
195 }
196
197 static struct class nodemgr_ne_class = {
198 .name = "ieee1394_node",
199 .release = ne_cls_release,
200 };
201
202 static void ud_cls_release(struct class_device *class_dev)
203 {
204 put_device(&container_of((class_dev), struct unit_directory, class_dev)->device);
205 }
206
207 /* The name here is only so that unit directory hotplug works with old
208 * style hotplug, which only ever did unit directories anyway. */
209 static struct class nodemgr_ud_class = {
210 .name = "ieee1394",
211 .release = ud_cls_release,
212 .uevent = nodemgr_uevent,
213 };
214
215 static struct hpsb_highlevel nodemgr_highlevel;
216
217
218 static void nodemgr_release_ud(struct device *dev)
219 {
220 struct unit_directory *ud = container_of(dev, struct unit_directory, device);
221
222 if (ud->vendor_name_kv)
223 csr1212_release_keyval(ud->vendor_name_kv);
224 if (ud->model_name_kv)
225 csr1212_release_keyval(ud->model_name_kv);
226
227 kfree(ud);
228 }
229
230 static void nodemgr_release_ne(struct device *dev)
231 {
232 struct node_entry *ne = container_of(dev, struct node_entry, device);
233
234 if (ne->vendor_name_kv)
235 csr1212_release_keyval(ne->vendor_name_kv);
236
237 kfree(ne);
238 }
239
240
241 static void nodemgr_release_host(struct device *dev)
242 {
243 struct hpsb_host *host = container_of(dev, struct hpsb_host, device);
244
245 csr1212_destroy_csr(host->csr.rom);
246
247 kfree(host);
248 }
249
250 static int nodemgr_ud_platform_data;
251
252 static struct device nodemgr_dev_template_ud = {
253 .bus = &ieee1394_bus_type,
254 .release = nodemgr_release_ud,
255 .platform_data = &nodemgr_ud_platform_data,
256 };
257
258 static struct device nodemgr_dev_template_ne = {
259 .bus = &ieee1394_bus_type,
260 .release = nodemgr_release_ne,
261 };
262
263 struct device nodemgr_dev_template_host = {
264 .bus = &ieee1394_bus_type,
265 .release = nodemgr_release_host,
266 };
267
268
269 #define fw_attr(class, class_type, field, type, format_string) \
270 static ssize_t fw_show_##class##_##field (struct device *dev, struct device_attribute *attr, char *buf)\
271 { \
272 class_type *class; \
273 class = container_of(dev, class_type, device); \
274 return sprintf(buf, format_string, (type)class->field); \
275 } \
276 static struct device_attribute dev_attr_##class##_##field = { \
277 .attr = {.name = __stringify(field), .mode = S_IRUGO }, \
278 .show = fw_show_##class##_##field, \
279 };
280
281 #define fw_attr_td(class, class_type, td_kv) \
282 static ssize_t fw_show_##class##_##td_kv (struct device *dev, struct device_attribute *attr, char *buf)\
283 { \
284 int len; \
285 class_type *class = container_of(dev, class_type, device); \
286 len = (class->td_kv->value.leaf.len - 2) * sizeof(quadlet_t); \
287 memcpy(buf, \
288 CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(class->td_kv), \
289 len); \
290 while ((buf + len - 1) == '\0') \
291 len--; \
292 buf[len++] = '\n'; \
293 buf[len] = '\0'; \
294 return len; \
295 } \
296 static struct device_attribute dev_attr_##class##_##td_kv = { \
297 .attr = {.name = __stringify(td_kv), .mode = S_IRUGO }, \
298 .show = fw_show_##class##_##td_kv, \
299 };
300
301
302 #define fw_drv_attr(field, type, format_string) \
303 static ssize_t fw_drv_show_##field (struct device_driver *drv, char *buf) \
304 { \
305 struct hpsb_protocol_driver *driver; \
306 driver = container_of(drv, struct hpsb_protocol_driver, driver); \
307 return sprintf(buf, format_string, (type)driver->field);\
308 } \
309 static struct driver_attribute driver_attr_drv_##field = { \
310 .attr = {.name = __stringify(field), .mode = S_IRUGO }, \
311 .show = fw_drv_show_##field, \
312 };
313
314
315 static ssize_t fw_show_ne_bus_options(struct device *dev, struct device_attribute *attr, char *buf)
316 {
317 struct node_entry *ne = container_of(dev, struct node_entry, device);
318
319 return sprintf(buf, "IRMC(%d) CMC(%d) ISC(%d) BMC(%d) PMC(%d) GEN(%d) "
320 "LSPD(%d) MAX_REC(%d) MAX_ROM(%d) CYC_CLK_ACC(%d)\n",
321 ne->busopt.irmc,
322 ne->busopt.cmc, ne->busopt.isc, ne->busopt.bmc,
323 ne->busopt.pmc, ne->busopt.generation, ne->busopt.lnkspd,
324 ne->busopt.max_rec,
325 ne->busopt.max_rom,
326 ne->busopt.cyc_clk_acc);
327 }
328 static DEVICE_ATTR(bus_options,S_IRUGO,fw_show_ne_bus_options,NULL);
329
330
331 #ifdef HPSB_DEBUG_TLABELS
332 static ssize_t fw_show_ne_tlabels_free(struct device *dev,
333 struct device_attribute *attr, char *buf)
334 {
335 struct node_entry *ne = container_of(dev, struct node_entry, device);
336 unsigned long flags;
337 unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
338 int tf;
339
340 spin_lock_irqsave(&hpsb_tlabel_lock, flags);
341 tf = 64 - bitmap_weight(tp, 64);
342 spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
343
344 return sprintf(buf, "%d\n", tf);
345 }
346 static DEVICE_ATTR(tlabels_free,S_IRUGO,fw_show_ne_tlabels_free,NULL);
347
348
349 static ssize_t fw_show_ne_tlabels_mask(struct device *dev,
350 struct device_attribute *attr, char *buf)
351 {
352 struct node_entry *ne = container_of(dev, struct node_entry, device);
353 unsigned long flags;
354 unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
355 u64 tm;
356
357 spin_lock_irqsave(&hpsb_tlabel_lock, flags);
358 #if (BITS_PER_LONG <= 32)
359 tm = ((u64)tp[0] << 32) + tp[1];
360 #else
361 tm = tp[0];
362 #endif
363 spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
364
365 return sprintf(buf, "0x%016llx\n", tm);
366 }
367 static DEVICE_ATTR(tlabels_mask, S_IRUGO, fw_show_ne_tlabels_mask, NULL);
368 #endif /* HPSB_DEBUG_TLABELS */
369
370
371 static ssize_t fw_set_ignore_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
372 {
373 struct unit_directory *ud = container_of(dev, struct unit_directory, device);
374 int state = simple_strtoul(buf, NULL, 10);
375
376 if (state == 1) {
377 down_write(&dev->bus->subsys.rwsem);
378 device_release_driver(dev);
379 ud->ignore_driver = 1;
380 up_write(&dev->bus->subsys.rwsem);
381 } else if (!state)
382 ud->ignore_driver = 0;
383
384 return count;
385 }
386 static ssize_t fw_get_ignore_driver(struct device *dev, struct device_attribute *attr, char *buf)
387 {
388 struct unit_directory *ud = container_of(dev, struct unit_directory, device);
389
390 return sprintf(buf, "%d\n", ud->ignore_driver);
391 }
392 static DEVICE_ATTR(ignore_driver, S_IWUSR | S_IRUGO, fw_get_ignore_driver, fw_set_ignore_driver);
393
394
395 static ssize_t fw_set_destroy_node(struct bus_type *bus, const char *buf, size_t count)
396 {
397 struct node_entry *ne;
398 u64 guid = (u64)simple_strtoull(buf, NULL, 16);
399
400 ne = find_entry_by_guid(guid);
401
402 if (ne == NULL || !ne->in_limbo)
403 return -EINVAL;
404
405 nodemgr_remove_ne(ne);
406
407 return count;
408 }
409 static ssize_t fw_get_destroy_node(struct bus_type *bus, char *buf)
410 {
411 return sprintf(buf, "You can destroy in_limbo nodes by writing their GUID to this file\n");
412 }
413 static BUS_ATTR(destroy_node, S_IWUSR | S_IRUGO, fw_get_destroy_node, fw_set_destroy_node);
414
415
416 static ssize_t fw_set_rescan(struct bus_type *bus, const char *buf,
417 size_t count)
418 {
419 int error = 0;
420
421 if (simple_strtoul(buf, NULL, 10) == 1)
422 error = bus_rescan_devices(&ieee1394_bus_type);
423 return error ? error : count;
424 }
425 static ssize_t fw_get_rescan(struct bus_type *bus, char *buf)
426 {
427 return sprintf(buf, "You can force a rescan of the bus for "
428 "drivers by writing a 1 to this file\n");
429 }
430 static BUS_ATTR(rescan, S_IWUSR | S_IRUGO, fw_get_rescan, fw_set_rescan);
431
432
433 static ssize_t fw_set_ignore_drivers(struct bus_type *bus, const char *buf, size_t count)
434 {
435 int state = simple_strtoul(buf, NULL, 10);
436
437 if (state == 1)
438 ignore_drivers = 1;
439 else if (!state)
440 ignore_drivers = 0;
441
442 return count;
443 }
444 static ssize_t fw_get_ignore_drivers(struct bus_type *bus, char *buf)
445 {
446 return sprintf(buf, "%d\n", ignore_drivers);
447 }
448 static BUS_ATTR(ignore_drivers, S_IWUSR | S_IRUGO, fw_get_ignore_drivers, fw_set_ignore_drivers);
449
450
451 struct bus_attribute *const fw_bus_attrs[] = {
452 &bus_attr_destroy_node,
453 &bus_attr_rescan,
454 &bus_attr_ignore_drivers,
455 NULL
456 };
457
458
459 fw_attr(ne, struct node_entry, capabilities, unsigned int, "0x%06x\n")
460 fw_attr(ne, struct node_entry, nodeid, unsigned int, "0x%04x\n")
461
462 fw_attr(ne, struct node_entry, vendor_id, unsigned int, "0x%06x\n")
463 fw_attr_td(ne, struct node_entry, vendor_name_kv)
464 fw_attr(ne, struct node_entry, vendor_oui, const char *, "%s\n")
465
466 fw_attr(ne, struct node_entry, guid, unsigned long long, "0x%016Lx\n")
467 fw_attr(ne, struct node_entry, guid_vendor_id, unsigned int, "0x%06x\n")
468 fw_attr(ne, struct node_entry, guid_vendor_oui, const char *, "%s\n")
469 fw_attr(ne, struct node_entry, in_limbo, int, "%d\n");
470
471 static struct device_attribute *const fw_ne_attrs[] = {
472 &dev_attr_ne_guid,
473 &dev_attr_ne_guid_vendor_id,
474 &dev_attr_ne_capabilities,
475 &dev_attr_ne_vendor_id,
476 &dev_attr_ne_nodeid,
477 &dev_attr_bus_options,
478 #ifdef HPSB_DEBUG_TLABELS
479 &dev_attr_tlabels_free,
480 &dev_attr_tlabels_mask,
481 #endif
482 };
483
484
485
486 fw_attr(ud, struct unit_directory, address, unsigned long long, "0x%016Lx\n")
487 fw_attr(ud, struct unit_directory, length, int, "%d\n")
488 /* These are all dependent on the value being provided */
489 fw_attr(ud, struct unit_directory, vendor_id, unsigned int, "0x%06x\n")
490 fw_attr(ud, struct unit_directory, model_id, unsigned int, "0x%06x\n")
491 fw_attr(ud, struct unit_directory, specifier_id, unsigned int, "0x%06x\n")
492 fw_attr(ud, struct unit_directory, version, unsigned int, "0x%06x\n")
493 fw_attr_td(ud, struct unit_directory, vendor_name_kv)
494 fw_attr(ud, struct unit_directory, vendor_oui, const char *, "%s\n")
495 fw_attr_td(ud, struct unit_directory, model_name_kv)
496
497 static struct device_attribute *const fw_ud_attrs[] = {
498 &dev_attr_ud_address,
499 &dev_attr_ud_length,
500 &dev_attr_ignore_driver,
501 };
502
503
504 fw_attr(host, struct hpsb_host, node_count, int, "%d\n")
505 fw_attr(host, struct hpsb_host, selfid_count, int, "%d\n")
506 fw_attr(host, struct hpsb_host, nodes_active, int, "%d\n")
507 fw_attr(host, struct hpsb_host, in_bus_reset, int, "%d\n")
508 fw_attr(host, struct hpsb_host, is_root, int, "%d\n")
509 fw_attr(host, struct hpsb_host, is_cycmst, int, "%d\n")
510 fw_attr(host, struct hpsb_host, is_irm, int, "%d\n")
511 fw_attr(host, struct hpsb_host, is_busmgr, int, "%d\n")
512
513 static struct device_attribute *const fw_host_attrs[] = {
514 &dev_attr_host_node_count,
515 &dev_attr_host_selfid_count,
516 &dev_attr_host_nodes_active,
517 &dev_attr_host_in_bus_reset,
518 &dev_attr_host_is_root,
519 &dev_attr_host_is_cycmst,
520 &dev_attr_host_is_irm,
521 &dev_attr_host_is_busmgr,
522 };
523
524
525 static ssize_t fw_show_drv_device_ids(struct device_driver *drv, char *buf)
526 {
527 struct hpsb_protocol_driver *driver;
528 struct ieee1394_device_id *id;
529 int length = 0;
530 char *scratch = buf;
531
532 driver = container_of(drv, struct hpsb_protocol_driver, driver);
533
534 for (id = driver->id_table; id->match_flags != 0; id++) {
535 int need_coma = 0;
536
537 if (id->match_flags & IEEE1394_MATCH_VENDOR_ID) {
538 length += sprintf(scratch, "vendor_id=0x%06x", id->vendor_id);
539 scratch = buf + length;
540 need_coma++;
541 }
542
543 if (id->match_flags & IEEE1394_MATCH_MODEL_ID) {
544 length += sprintf(scratch, "%smodel_id=0x%06x",
545 need_coma++ ? "," : "",
546 id->model_id);
547 scratch = buf + length;
548 }
549
550 if (id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) {
551 length += sprintf(scratch, "%sspecifier_id=0x%06x",
552 need_coma++ ? "," : "",
553 id->specifier_id);
554 scratch = buf + length;
555 }
556
557 if (id->match_flags & IEEE1394_MATCH_VERSION) {
558 length += sprintf(scratch, "%sversion=0x%06x",
559 need_coma++ ? "," : "",
560 id->version);
561 scratch = buf + length;
562 }
563
564 if (need_coma) {
565 *scratch++ = '\n';
566 length++;
567 }
568 }
569
570 return length;
571 }
572 static DRIVER_ATTR(device_ids,S_IRUGO,fw_show_drv_device_ids,NULL);
573
574
575 fw_drv_attr(name, const char *, "%s\n")
576
577 static struct driver_attribute *const fw_drv_attrs[] = {
578 &driver_attr_drv_name,
579 &driver_attr_device_ids,
580 };
581
582
583 static void nodemgr_create_drv_files(struct hpsb_protocol_driver *driver)
584 {
585 struct device_driver *drv = &driver->driver;
586 int i;
587
588 for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
589 if (driver_create_file(drv, fw_drv_attrs[i]))
590 goto fail;
591 return;
592 fail:
593 HPSB_ERR("Failed to add sysfs attribute for driver %s", driver->name);
594 }
595
596
597 static void nodemgr_remove_drv_files(struct hpsb_protocol_driver *driver)
598 {
599 struct device_driver *drv = &driver->driver;
600 int i;
601
602 for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
603 driver_remove_file(drv, fw_drv_attrs[i]);
604 }
605
606
607 static void nodemgr_create_ne_dev_files(struct node_entry *ne)
608 {
609 struct device *dev = &ne->device;
610 int i;
611
612 for (i = 0; i < ARRAY_SIZE(fw_ne_attrs); i++)
613 if (device_create_file(dev, fw_ne_attrs[i]))
614 goto fail;
615 return;
616 fail:
617 HPSB_ERR("Failed to add sysfs attribute for node %016Lx",
618 (unsigned long long)ne->guid);
619 }
620
621
622 static void nodemgr_create_host_dev_files(struct hpsb_host *host)
623 {
624 struct device *dev = &host->device;
625 int i;
626
627 for (i = 0; i < ARRAY_SIZE(fw_host_attrs); i++)
628 if (device_create_file(dev, fw_host_attrs[i]))
629 goto fail;
630 return;
631 fail:
632 HPSB_ERR("Failed to add sysfs attribute for host %d", host->id);
633 }
634
635
636 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
637 nodeid_t nodeid);
638
639 static void nodemgr_update_host_dev_links(struct hpsb_host *host)
640 {
641 struct device *dev = &host->device;
642 struct node_entry *ne;
643
644 sysfs_remove_link(&dev->kobj, "irm_id");
645 sysfs_remove_link(&dev->kobj, "busmgr_id");
646 sysfs_remove_link(&dev->kobj, "host_id");
647
648 if ((ne = find_entry_by_nodeid(host, host->irm_id)) &&
649 sysfs_create_link(&dev->kobj, &ne->device.kobj, "irm_id"))
650 goto fail;
651 if ((ne = find_entry_by_nodeid(host, host->busmgr_id)) &&
652 sysfs_create_link(&dev->kobj, &ne->device.kobj, "busmgr_id"))
653 goto fail;
654 if ((ne = find_entry_by_nodeid(host, host->node_id)) &&
655 sysfs_create_link(&dev->kobj, &ne->device.kobj, "host_id"))
656 goto fail;
657 return;
658 fail:
659 HPSB_ERR("Failed to update sysfs attributes for host %d", host->id);
660 }
661
662 static void nodemgr_create_ud_dev_files(struct unit_directory *ud)
663 {
664 struct device *dev = &ud->device;
665 int i;
666
667 for (i = 0; i < ARRAY_SIZE(fw_ud_attrs); i++)
668 if (device_create_file(dev, fw_ud_attrs[i]))
669 goto fail;
670 if (ud->flags & UNIT_DIRECTORY_SPECIFIER_ID)
671 if (device_create_file(dev, &dev_attr_ud_specifier_id))
672 goto fail;
673 if (ud->flags & UNIT_DIRECTORY_VERSION)
674 if (device_create_file(dev, &dev_attr_ud_version))
675 goto fail;
676 if (ud->flags & UNIT_DIRECTORY_VENDOR_ID) {
677 if (device_create_file(dev, &dev_attr_ud_vendor_id))
678 goto fail;
679 if (ud->vendor_name_kv &&
680 device_create_file(dev, &dev_attr_ud_vendor_name_kv))
681 goto fail;
682 }
683 if (ud->flags & UNIT_DIRECTORY_MODEL_ID) {
684 if (device_create_file(dev, &dev_attr_ud_model_id))
685 goto fail;
686 if (ud->model_name_kv &&
687 device_create_file(dev, &dev_attr_ud_model_name_kv))
688 goto fail;
689 }
690 return;
691 fail:
692 HPSB_ERR("Failed to add sysfs attributes for unit %s",
693 ud->device.bus_id);
694 }
695
696
697 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv)
698 {
699 struct hpsb_protocol_driver *driver;
700 struct unit_directory *ud;
701 struct ieee1394_device_id *id;
702
703 /* We only match unit directories */
704 if (dev->platform_data != &nodemgr_ud_platform_data)
705 return 0;
706
707 ud = container_of(dev, struct unit_directory, device);
708 driver = container_of(drv, struct hpsb_protocol_driver, driver);
709
710 if (ud->ne->in_limbo || ud->ignore_driver)
711 return 0;
712
713 for (id = driver->id_table; id->match_flags != 0; id++) {
714 if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) &&
715 id->vendor_id != ud->vendor_id)
716 continue;
717
718 if ((id->match_flags & IEEE1394_MATCH_MODEL_ID) &&
719 id->model_id != ud->model_id)
720 continue;
721
722 if ((id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) &&
723 id->specifier_id != ud->specifier_id)
724 continue;
725
726 if ((id->match_flags & IEEE1394_MATCH_VERSION) &&
727 id->version != ud->version)
728 continue;
729
730 return 1;
731 }
732
733 return 0;
734 }
735
736
737 static void nodemgr_remove_uds(struct node_entry *ne)
738 {
739 struct class_device *cdev, *next;
740 struct unit_directory *ud;
741
742 list_for_each_entry_safe(cdev, next, &nodemgr_ud_class.children, node) {
743 ud = container_of(cdev, struct unit_directory, class_dev);
744
745 if (ud->ne != ne)
746 continue;
747
748 class_device_unregister(&ud->class_dev);
749 device_unregister(&ud->device);
750 }
751 }
752
753
754 static void nodemgr_remove_ne(struct node_entry *ne)
755 {
756 struct device *dev = &ne->device;
757
758 dev = get_device(&ne->device);
759 if (!dev)
760 return;
761
762 HPSB_DEBUG("Node removed: ID:BUS[" NODE_BUS_FMT "] GUID[%016Lx]",
763 NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
764
765 nodemgr_remove_uds(ne);
766
767 class_device_unregister(&ne->class_dev);
768 device_unregister(dev);
769
770 put_device(dev);
771 }
772
773 static int __nodemgr_remove_host_dev(struct device *dev, void *data)
774 {
775 nodemgr_remove_ne(container_of(dev, struct node_entry, device));
776 return 0;
777 }
778
779 static void nodemgr_remove_host_dev(struct device *dev)
780 {
781 WARN_ON(device_for_each_child(dev, NULL, __nodemgr_remove_host_dev));
782 sysfs_remove_link(&dev->kobj, "irm_id");
783 sysfs_remove_link(&dev->kobj, "busmgr_id");
784 sysfs_remove_link(&dev->kobj, "host_id");
785 }
786
787
788 static void nodemgr_update_bus_options(struct node_entry *ne)
789 {
790 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
791 static const u16 mr[] = { 4, 64, 1024, 0};
792 #endif
793 quadlet_t busoptions = be32_to_cpu(ne->csr->bus_info_data[2]);
794
795 ne->busopt.irmc = (busoptions >> 31) & 1;
796 ne->busopt.cmc = (busoptions >> 30) & 1;
797 ne->busopt.isc = (busoptions >> 29) & 1;
798 ne->busopt.bmc = (busoptions >> 28) & 1;
799 ne->busopt.pmc = (busoptions >> 27) & 1;
800 ne->busopt.cyc_clk_acc = (busoptions >> 16) & 0xff;
801 ne->busopt.max_rec = 1 << (((busoptions >> 12) & 0xf) + 1);
802 ne->busopt.max_rom = (busoptions >> 8) & 0x3;
803 ne->busopt.generation = (busoptions >> 4) & 0xf;
804 ne->busopt.lnkspd = busoptions & 0x7;
805
806 HPSB_VERBOSE("NodeMgr: raw=0x%08x irmc=%d cmc=%d isc=%d bmc=%d pmc=%d "
807 "cyc_clk_acc=%d max_rec=%d max_rom=%d gen=%d lspd=%d",
808 busoptions, ne->busopt.irmc, ne->busopt.cmc,
809 ne->busopt.isc, ne->busopt.bmc, ne->busopt.pmc,
810 ne->busopt.cyc_clk_acc, ne->busopt.max_rec,
811 mr[ne->busopt.max_rom],
812 ne->busopt.generation, ne->busopt.lnkspd);
813 }
814
815
816 static struct node_entry *nodemgr_create_node(octlet_t guid, struct csr1212_csr *csr,
817 struct host_info *hi, nodeid_t nodeid,
818 unsigned int generation)
819 {
820 struct hpsb_host *host = hi->host;
821 struct node_entry *ne;
822
823 ne = kzalloc(sizeof(*ne), GFP_KERNEL);
824 if (!ne)
825 goto fail_alloc;
826
827 ne->host = host;
828 ne->nodeid = nodeid;
829 ne->generation = generation;
830 ne->needs_probe = 1;
831
832 ne->guid = guid;
833 ne->guid_vendor_id = (guid >> 40) & 0xffffff;
834 ne->guid_vendor_oui = nodemgr_find_oui_name(ne->guid_vendor_id);
835 ne->csr = csr;
836
837 memcpy(&ne->device, &nodemgr_dev_template_ne,
838 sizeof(ne->device));
839 ne->device.parent = &host->device;
840 snprintf(ne->device.bus_id, BUS_ID_SIZE, "%016Lx",
841 (unsigned long long)(ne->guid));
842
843 ne->class_dev.dev = &ne->device;
844 ne->class_dev.class = &nodemgr_ne_class;
845 snprintf(ne->class_dev.class_id, BUS_ID_SIZE, "%016Lx",
846 (unsigned long long)(ne->guid));
847
848 if (device_register(&ne->device))
849 goto fail_devreg;
850 if (class_device_register(&ne->class_dev))
851 goto fail_classdevreg;
852 get_device(&ne->device);
853
854 if (ne->guid_vendor_oui &&
855 device_create_file(&ne->device, &dev_attr_ne_guid_vendor_oui))
856 goto fail_addoiu;
857 nodemgr_create_ne_dev_files(ne);
858
859 nodemgr_update_bus_options(ne);
860
861 HPSB_DEBUG("%s added: ID:BUS[" NODE_BUS_FMT "] GUID[%016Lx]",
862 (host->node_id == nodeid) ? "Host" : "Node",
863 NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
864
865 return ne;
866
867 fail_addoiu:
868 put_device(&ne->device);
869 fail_classdevreg:
870 device_unregister(&ne->device);
871 fail_devreg:
872 kfree(ne);
873 fail_alloc:
874 HPSB_ERR("Failed to create node ID:BUS[" NODE_BUS_FMT "] GUID[%016Lx]",
875 NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
876
877 return NULL;
878 }
879
880
881 static struct node_entry *find_entry_by_guid(u64 guid)
882 {
883 struct class *class = &nodemgr_ne_class;
884 struct class_device *cdev;
885 struct node_entry *ne, *ret_ne = NULL;
886
887 down_read(&class->subsys.rwsem);
888 list_for_each_entry(cdev, &class->children, node) {
889 ne = container_of(cdev, struct node_entry, class_dev);
890
891 if (ne->guid == guid) {
892 ret_ne = ne;
893 break;
894 }
895 }
896 up_read(&class->subsys.rwsem);
897
898 return ret_ne;
899 }
900
901
902 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host, nodeid_t nodeid)
903 {
904 struct class *class = &nodemgr_ne_class;
905 struct class_device *cdev;
906 struct node_entry *ne, *ret_ne = NULL;
907
908 down_read(&class->subsys.rwsem);
909 list_for_each_entry(cdev, &class->children, node) {
910 ne = container_of(cdev, struct node_entry, class_dev);
911
912 if (ne->host == host && ne->nodeid == nodeid) {
913 ret_ne = ne;
914 break;
915 }
916 }
917 up_read(&class->subsys.rwsem);
918
919 return ret_ne;
920 }
921
922
923 static void nodemgr_register_device(struct node_entry *ne,
924 struct unit_directory *ud, struct device *parent)
925 {
926 memcpy(&ud->device, &nodemgr_dev_template_ud,
927 sizeof(ud->device));
928
929 ud->device.parent = parent;
930
931 snprintf(ud->device.bus_id, BUS_ID_SIZE, "%s-%u",
932 ne->device.bus_id, ud->id);
933
934 ud->class_dev.dev = &ud->device;
935 ud->class_dev.class = &nodemgr_ud_class;
936 snprintf(ud->class_dev.class_id, BUS_ID_SIZE, "%s-%u",
937 ne->device.bus_id, ud->id);
938
939 if (device_register(&ud->device))
940 goto fail_devreg;
941 if (class_device_register(&ud->class_dev))
942 goto fail_classdevreg;
943 get_device(&ud->device);
944
945 if (ud->vendor_oui &&
946 device_create_file(&ud->device, &dev_attr_ud_vendor_oui))
947 goto fail_addoui;
948 nodemgr_create_ud_dev_files(ud);
949
950 return;
951
952 fail_addoui:
953 put_device(&ud->device);
954 fail_classdevreg:
955 device_unregister(&ud->device);
956 fail_devreg:
957 HPSB_ERR("Failed to create unit %s", ud->device.bus_id);
958 }
959
960
961 /* This implementation currently only scans the config rom and its
962 * immediate unit directories looking for software_id and
963 * software_version entries, in order to get driver autoloading working. */
964 static struct unit_directory *nodemgr_process_unit_directory
965 (struct host_info *hi, struct node_entry *ne, struct csr1212_keyval *ud_kv,
966 unsigned int *id, struct unit_directory *parent)
967 {
968 struct unit_directory *ud;
969 struct unit_directory *ud_child = NULL;
970 struct csr1212_dentry *dentry;
971 struct csr1212_keyval *kv;
972 u8 last_key_id = 0;
973
974 ud = kzalloc(sizeof(*ud), GFP_KERNEL);
975 if (!ud)
976 goto unit_directory_error;
977
978 ud->ne = ne;
979 ud->ignore_driver = ignore_drivers;
980 ud->address = ud_kv->offset + CSR1212_CONFIG_ROM_SPACE_BASE;
981 ud->ud_kv = ud_kv;
982 ud->id = (*id)++;
983
984 csr1212_for_each_dir_entry(ne->csr, kv, ud_kv, dentry) {
985 switch (kv->key.id) {
986 case CSR1212_KV_ID_VENDOR:
987 if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
988 ud->vendor_id = kv->value.immediate;
989 ud->flags |= UNIT_DIRECTORY_VENDOR_ID;
990
991 if (ud->vendor_id)
992 ud->vendor_oui = nodemgr_find_oui_name(ud->vendor_id);
993 }
994 break;
995
996 case CSR1212_KV_ID_MODEL:
997 ud->model_id = kv->value.immediate;
998 ud->flags |= UNIT_DIRECTORY_MODEL_ID;
999 break;
1000
1001 case CSR1212_KV_ID_SPECIFIER_ID:
1002 ud->specifier_id = kv->value.immediate;
1003 ud->flags |= UNIT_DIRECTORY_SPECIFIER_ID;
1004 break;
1005
1006 case CSR1212_KV_ID_VERSION:
1007 ud->version = kv->value.immediate;
1008 ud->flags |= UNIT_DIRECTORY_VERSION;
1009 break;
1010
1011 case CSR1212_KV_ID_DESCRIPTOR:
1012 if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1013 CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1014 CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1015 CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1016 CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1017 CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1018 switch (last_key_id) {
1019 case CSR1212_KV_ID_VENDOR:
1020 ud->vendor_name_kv = kv;
1021 csr1212_keep_keyval(kv);
1022 break;
1023
1024 case CSR1212_KV_ID_MODEL:
1025 ud->model_name_kv = kv;
1026 csr1212_keep_keyval(kv);
1027 break;
1028
1029 }
1030 } /* else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) ... */
1031 break;
1032
1033 case CSR1212_KV_ID_DEPENDENT_INFO:
1034 /* Logical Unit Number */
1035 if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
1036 if (ud->flags & UNIT_DIRECTORY_HAS_LUN) {
1037 ud_child = kmalloc(sizeof(*ud_child), GFP_KERNEL);
1038 if (!ud_child)
1039 goto unit_directory_error;
1040 memcpy(ud_child, ud, sizeof(*ud_child));
1041 nodemgr_register_device(ne, ud_child, &ne->device);
1042 ud_child = NULL;
1043
1044 ud->id = (*id)++;
1045 }
1046 ud->lun = kv->value.immediate;
1047 ud->flags |= UNIT_DIRECTORY_HAS_LUN;
1048
1049 /* Logical Unit Directory */
1050 } else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) {
1051 /* This should really be done in SBP2 as this is
1052 * doing SBP2 specific parsing.
1053 */
1054
1055 /* first register the parent unit */
1056 ud->flags |= UNIT_DIRECTORY_HAS_LUN_DIRECTORY;
1057 if (ud->device.bus != &ieee1394_bus_type)
1058 nodemgr_register_device(ne, ud, &ne->device);
1059
1060 /* process the child unit */
1061 ud_child = nodemgr_process_unit_directory(hi, ne, kv, id, ud);
1062
1063 if (ud_child == NULL)
1064 break;
1065
1066 /* inherit unspecified values, the driver core picks it up */
1067 if ((ud->flags & UNIT_DIRECTORY_MODEL_ID) &&
1068 !(ud_child->flags & UNIT_DIRECTORY_MODEL_ID))
1069 {
1070 ud_child->flags |= UNIT_DIRECTORY_MODEL_ID;
1071 ud_child->model_id = ud->model_id;
1072 }
1073 if ((ud->flags & UNIT_DIRECTORY_SPECIFIER_ID) &&
1074 !(ud_child->flags & UNIT_DIRECTORY_SPECIFIER_ID))
1075 {
1076 ud_child->flags |= UNIT_DIRECTORY_SPECIFIER_ID;
1077 ud_child->specifier_id = ud->specifier_id;
1078 }
1079 if ((ud->flags & UNIT_DIRECTORY_VERSION) &&
1080 !(ud_child->flags & UNIT_DIRECTORY_VERSION))
1081 {
1082 ud_child->flags |= UNIT_DIRECTORY_VERSION;
1083 ud_child->version = ud->version;
1084 }
1085
1086 /* register the child unit */
1087 ud_child->flags |= UNIT_DIRECTORY_LUN_DIRECTORY;
1088 nodemgr_register_device(ne, ud_child, &ud->device);
1089 }
1090
1091 break;
1092
1093 default:
1094 break;
1095 }
1096 last_key_id = kv->key.id;
1097 }
1098
1099 /* do not process child units here and only if not already registered */
1100 if (!parent && ud->device.bus != &ieee1394_bus_type)
1101 nodemgr_register_device(ne, ud, &ne->device);
1102
1103 return ud;
1104
1105 unit_directory_error:
1106 kfree(ud);
1107 return NULL;
1108 }
1109
1110
1111 static void nodemgr_process_root_directory(struct host_info *hi, struct node_entry *ne)
1112 {
1113 unsigned int ud_id = 0;
1114 struct csr1212_dentry *dentry;
1115 struct csr1212_keyval *kv;
1116 u8 last_key_id = 0;
1117
1118 ne->needs_probe = 0;
1119
1120 csr1212_for_each_dir_entry(ne->csr, kv, ne->csr->root_kv, dentry) {
1121 switch (kv->key.id) {
1122 case CSR1212_KV_ID_VENDOR:
1123 ne->vendor_id = kv->value.immediate;
1124
1125 if (ne->vendor_id)
1126 ne->vendor_oui = nodemgr_find_oui_name(ne->vendor_id);
1127 break;
1128
1129 case CSR1212_KV_ID_NODE_CAPABILITIES:
1130 ne->capabilities = kv->value.immediate;
1131 break;
1132
1133 case CSR1212_KV_ID_UNIT:
1134 nodemgr_process_unit_directory(hi, ne, kv, &ud_id, NULL);
1135 break;
1136
1137 case CSR1212_KV_ID_DESCRIPTOR:
1138 if (last_key_id == CSR1212_KV_ID_VENDOR) {
1139 if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1140 CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1141 CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1142 CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1143 CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1144 CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1145 ne->vendor_name_kv = kv;
1146 csr1212_keep_keyval(kv);
1147 }
1148 }
1149 break;
1150 }
1151 last_key_id = kv->key.id;
1152 }
1153
1154 if (ne->vendor_oui &&
1155 device_create_file(&ne->device, &dev_attr_ne_vendor_oui))
1156 goto fail;
1157 if (ne->vendor_name_kv &&
1158 device_create_file(&ne->device, &dev_attr_ne_vendor_name_kv))
1159 goto fail;
1160 return;
1161 fail:
1162 HPSB_ERR("Failed to add sysfs attribute for node %016Lx",
1163 (unsigned long long)ne->guid);
1164 }
1165
1166 #ifdef CONFIG_HOTPLUG
1167
1168 static int nodemgr_uevent(struct class_device *cdev, char **envp, int num_envp,
1169 char *buffer, int buffer_size)
1170 {
1171 struct unit_directory *ud;
1172 int i = 0;
1173 int length = 0;
1174 /* ieee1394:venNmoNspNverN */
1175 char buf[8 + 1 + 3 + 8 + 2 + 8 + 2 + 8 + 3 + 8 + 1];
1176
1177 if (!cdev)
1178 return -ENODEV;
1179
1180 ud = container_of(cdev, struct unit_directory, class_dev);
1181
1182 if (ud->ne->in_limbo || ud->ignore_driver)
1183 return -ENODEV;
1184
1185 #define PUT_ENVP(fmt,val) \
1186 do { \
1187 int printed; \
1188 envp[i++] = buffer; \
1189 printed = snprintf(buffer, buffer_size - length, \
1190 fmt, val); \
1191 if ((buffer_size - (length+printed) <= 0) || (i >= num_envp)) \
1192 return -ENOMEM; \
1193 length += printed+1; \
1194 buffer += printed+1; \
1195 } while (0)
1196
1197 PUT_ENVP("VENDOR_ID=%06x", ud->vendor_id);
1198 PUT_ENVP("MODEL_ID=%06x", ud->model_id);
1199 PUT_ENVP("GUID=%016Lx", (unsigned long long)ud->ne->guid);
1200 PUT_ENVP("SPECIFIER_ID=%06x", ud->specifier_id);
1201 PUT_ENVP("VERSION=%06x", ud->version);
1202 snprintf(buf, sizeof(buf), "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
1203 ud->vendor_id,
1204 ud->model_id,
1205 ud->specifier_id,
1206 ud->version);
1207 PUT_ENVP("MODALIAS=%s", buf);
1208
1209 #undef PUT_ENVP
1210
1211 envp[i] = NULL;
1212
1213 return 0;
1214 }
1215
1216 #else
1217
1218 static int nodemgr_uevent(struct class_device *cdev, char **envp, int num_envp,
1219 char *buffer, int buffer_size)
1220 {
1221 return -ENODEV;
1222 }
1223
1224 #endif /* CONFIG_HOTPLUG */
1225
1226
1227 int hpsb_register_protocol(struct hpsb_protocol_driver *driver)
1228 {
1229 /* This will cause a probe for devices */
1230 int error = driver_register(&driver->driver);
1231 if (!error)
1232 nodemgr_create_drv_files(driver);
1233 return error;
1234 }
1235
1236 void hpsb_unregister_protocol(struct hpsb_protocol_driver *driver)
1237 {
1238 nodemgr_remove_drv_files(driver);
1239 /* This will subsequently disconnect all devices that our driver
1240 * is attached to. */
1241 driver_unregister(&driver->driver);
1242 }
1243
1244
1245 /*
1246 * This function updates nodes that were present on the bus before the
1247 * reset and still are after the reset. The nodeid and the config rom
1248 * may have changed, and the drivers managing this device must be
1249 * informed that this device just went through a bus reset, to allow
1250 * the to take whatever actions required.
1251 */
1252 static void nodemgr_update_node(struct node_entry *ne, struct csr1212_csr *csr,
1253 struct host_info *hi, nodeid_t nodeid,
1254 unsigned int generation)
1255 {
1256 if (ne->nodeid != nodeid) {
1257 HPSB_DEBUG("Node changed: " NODE_BUS_FMT " -> " NODE_BUS_FMT,
1258 NODE_BUS_ARGS(ne->host, ne->nodeid),
1259 NODE_BUS_ARGS(ne->host, nodeid));
1260 ne->nodeid = nodeid;
1261 }
1262
1263 if (ne->busopt.generation != ((be32_to_cpu(csr->bus_info_data[2]) >> 4) & 0xf)) {
1264 kfree(ne->csr->private);
1265 csr1212_destroy_csr(ne->csr);
1266 ne->csr = csr;
1267
1268 /* If the node's configrom generation has changed, we
1269 * unregister all the unit directories. */
1270 nodemgr_remove_uds(ne);
1271
1272 nodemgr_update_bus_options(ne);
1273
1274 /* Mark the node as new, so it gets re-probed */
1275 ne->needs_probe = 1;
1276 } else {
1277 /* old cache is valid, so update its generation */
1278 struct nodemgr_csr_info *ci = ne->csr->private;
1279 ci->generation = generation;
1280 /* free the partially filled now unneeded new cache */
1281 kfree(csr->private);
1282 csr1212_destroy_csr(csr);
1283 }
1284
1285 if (ne->in_limbo)
1286 nodemgr_resume_ne(ne);
1287
1288 /* Mark the node current */
1289 ne->generation = generation;
1290 }
1291
1292
1293
1294 static void nodemgr_node_scan_one(struct host_info *hi,
1295 nodeid_t nodeid, int generation)
1296 {
1297 struct hpsb_host *host = hi->host;
1298 struct node_entry *ne;
1299 octlet_t guid;
1300 struct csr1212_csr *csr;
1301 struct nodemgr_csr_info *ci;
1302 u8 *speed;
1303
1304 ci = kmalloc(sizeof(*ci), GFP_KERNEL);
1305 if (!ci)
1306 return;
1307
1308 ci->host = host;
1309 ci->nodeid = nodeid;
1310 ci->generation = generation;
1311
1312 /* Prepare for speed probe which occurs when reading the ROM */
1313 speed = &(host->speed[NODEID_TO_NODE(nodeid)]);
1314 if (*speed > host->csr.lnk_spd)
1315 *speed = host->csr.lnk_spd;
1316 ci->speed_unverified = *speed > IEEE1394_SPEED_100;
1317
1318 /* We need to detect when the ConfigROM's generation has changed,
1319 * so we only update the node's info when it needs to be. */
1320
1321 csr = csr1212_create_csr(&nodemgr_csr_ops, 5 * sizeof(quadlet_t), ci);
1322 if (!csr || csr1212_parse_csr(csr) != CSR1212_SUCCESS) {
1323 HPSB_ERR("Error parsing configrom for node " NODE_BUS_FMT,
1324 NODE_BUS_ARGS(host, nodeid));
1325 if (csr)
1326 csr1212_destroy_csr(csr);
1327 kfree(ci);
1328 return;
1329 }
1330
1331 if (csr->bus_info_data[1] != IEEE1394_BUSID_MAGIC) {
1332 /* This isn't a 1394 device, but we let it slide. There
1333 * was a report of a device with broken firmware which
1334 * reported '2394' instead of '1394', which is obviously a
1335 * mistake. One would hope that a non-1394 device never
1336 * gets connected to Firewire bus. If someone does, we
1337 * shouldn't be held responsible, so we'll allow it with a
1338 * warning. */
1339 HPSB_WARN("Node " NODE_BUS_FMT " has invalid busID magic [0x%08x]",
1340 NODE_BUS_ARGS(host, nodeid), csr->bus_info_data[1]);
1341 }
1342
1343 guid = ((u64)be32_to_cpu(csr->bus_info_data[3]) << 32) | be32_to_cpu(csr->bus_info_data[4]);
1344 ne = find_entry_by_guid(guid);
1345
1346 if (ne && ne->host != host && ne->in_limbo) {
1347 /* Must have moved this device from one host to another */
1348 nodemgr_remove_ne(ne);
1349 ne = NULL;
1350 }
1351
1352 if (!ne)
1353 nodemgr_create_node(guid, csr, hi, nodeid, generation);
1354 else
1355 nodemgr_update_node(ne, csr, hi, nodeid, generation);
1356 }
1357
1358
1359 static void nodemgr_node_scan(struct host_info *hi, int generation)
1360 {
1361 int count;
1362 struct hpsb_host *host = hi->host;
1363 struct selfid *sid = (struct selfid *)host->topology_map;
1364 nodeid_t nodeid = LOCAL_BUS;
1365
1366 /* Scan each node on the bus */
1367 for (count = host->selfid_count; count; count--, sid++) {
1368 if (sid->extended)
1369 continue;
1370
1371 if (!sid->link_active) {
1372 nodeid++;
1373 continue;
1374 }
1375 nodemgr_node_scan_one(hi, nodeid++, generation);
1376 }
1377 }
1378
1379
1380 /* Caller needs to hold nodemgr_ud_class.subsys.rwsem as reader. */
1381 static void nodemgr_suspend_ne(struct node_entry *ne)
1382 {
1383 struct class_device *cdev;
1384 struct unit_directory *ud;
1385
1386 HPSB_DEBUG("Node suspended: ID:BUS[" NODE_BUS_FMT "] GUID[%016Lx]",
1387 NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1388
1389 ne->in_limbo = 1;
1390 WARN_ON(device_create_file(&ne->device, &dev_attr_ne_in_limbo));
1391
1392 down_write(&ne->device.bus->subsys.rwsem);
1393 list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1394 ud = container_of(cdev, struct unit_directory, class_dev);
1395
1396 if (ud->ne != ne)
1397 continue;
1398
1399 if (ud->device.driver &&
1400 (!ud->device.driver->suspend ||
1401 ud->device.driver->suspend(&ud->device, PMSG_SUSPEND)))
1402 device_release_driver(&ud->device);
1403 }
1404 up_write(&ne->device.bus->subsys.rwsem);
1405 }
1406
1407
1408 static void nodemgr_resume_ne(struct node_entry *ne)
1409 {
1410 struct class_device *cdev;
1411 struct unit_directory *ud;
1412
1413 ne->in_limbo = 0;
1414 device_remove_file(&ne->device, &dev_attr_ne_in_limbo);
1415
1416 down_read(&nodemgr_ud_class.subsys.rwsem);
1417 down_read(&ne->device.bus->subsys.rwsem);
1418 list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1419 ud = container_of(cdev, struct unit_directory, class_dev);
1420
1421 if (ud->ne != ne)
1422 continue;
1423
1424 if (ud->device.driver && ud->device.driver->resume)
1425 ud->device.driver->resume(&ud->device);
1426 }
1427 up_read(&ne->device.bus->subsys.rwsem);
1428 up_read(&nodemgr_ud_class.subsys.rwsem);
1429
1430 HPSB_DEBUG("Node resumed: ID:BUS[" NODE_BUS_FMT "] GUID[%016Lx]",
1431 NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1432 }
1433
1434
1435 /* Caller needs to hold nodemgr_ud_class.subsys.rwsem as reader. */
1436 static void nodemgr_update_pdrv(struct node_entry *ne)
1437 {
1438 struct unit_directory *ud;
1439 struct hpsb_protocol_driver *pdrv;
1440 struct class_device *cdev;
1441
1442 list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1443 ud = container_of(cdev, struct unit_directory, class_dev);
1444 if (ud->ne != ne || !ud->device.driver)
1445 continue;
1446
1447 pdrv = container_of(ud->device.driver, struct hpsb_protocol_driver, driver);
1448
1449 if (pdrv->update && pdrv->update(ud)) {
1450 down_write(&ud->device.bus->subsys.rwsem);
1451 device_release_driver(&ud->device);
1452 up_write(&ud->device.bus->subsys.rwsem);
1453 }
1454 }
1455 }
1456
1457
1458 /* Write the BROADCAST_CHANNEL as per IEEE1394a 8.3.2.3.11 and 8.4.2.3. This
1459 * seems like an optional service but in the end it is practically mandatory
1460 * as a consequence of these clauses.
1461 *
1462 * Note that we cannot do a broadcast write to all nodes at once because some
1463 * pre-1394a devices would hang. */
1464 static void nodemgr_irm_write_bc(struct node_entry *ne, int generation)
1465 {
1466 const u64 bc_addr = (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL);
1467 quadlet_t bc_remote, bc_local;
1468 int error;
1469
1470 if (!ne->host->is_irm || ne->generation != generation ||
1471 ne->nodeid == ne->host->node_id)
1472 return;
1473
1474 bc_local = cpu_to_be32(ne->host->csr.broadcast_channel);
1475
1476 /* Check if the register is implemented and 1394a compliant. */
1477 error = hpsb_read(ne->host, ne->nodeid, generation, bc_addr, &bc_remote,
1478 sizeof(bc_remote));
1479 if (!error && bc_remote & cpu_to_be32(0x80000000) &&
1480 bc_remote != bc_local)
1481 hpsb_node_write(ne, bc_addr, &bc_local, sizeof(bc_local));
1482 }
1483
1484
1485 /* Caller needs to hold nodemgr_ud_class.subsys.rwsem as reader because the
1486 * calls to nodemgr_update_pdrv() and nodemgr_suspend_ne() here require it. */
1487 static void nodemgr_probe_ne(struct host_info *hi, struct node_entry *ne, int generation)
1488 {
1489 struct device *dev;
1490
1491 if (ne->host != hi->host || ne->in_limbo)
1492 return;
1493
1494 dev = get_device(&ne->device);
1495 if (!dev)
1496 return;
1497
1498 nodemgr_irm_write_bc(ne, generation);
1499
1500 /* If "needs_probe", then this is either a new or changed node we
1501 * rescan totally. If the generation matches for an existing node
1502 * (one that existed prior to the bus reset) we send update calls
1503 * down to the drivers. Otherwise, this is a dead node and we
1504 * suspend it. */
1505 if (ne->needs_probe)
1506 nodemgr_process_root_directory(hi, ne);
1507 else if (ne->generation == generation)
1508 nodemgr_update_pdrv(ne);
1509 else
1510 nodemgr_suspend_ne(ne);
1511
1512 put_device(dev);
1513 }
1514
1515
1516 static void nodemgr_node_probe(struct host_info *hi, int generation)
1517 {
1518 struct hpsb_host *host = hi->host;
1519 struct class *class = &nodemgr_ne_class;
1520 struct class_device *cdev;
1521 struct node_entry *ne;
1522
1523 /* Do some processing of the nodes we've probed. This pulls them
1524 * into the sysfs layer if needed, and can result in processing of
1525 * unit-directories, or just updating the node and it's
1526 * unit-directories.
1527 *
1528 * Run updates before probes. Usually, updates are time-critical
1529 * while probes are time-consuming. (Well, those probes need some
1530 * improvement...) */
1531
1532 down_read(&class->subsys.rwsem);
1533 list_for_each_entry(cdev, &class->children, node) {
1534 ne = container_of(cdev, struct node_entry, class_dev);
1535 if (!ne->needs_probe)
1536 nodemgr_probe_ne(hi, ne, generation);
1537 }
1538 list_for_each_entry(cdev, &class->children, node) {
1539 ne = container_of(cdev, struct node_entry, class_dev);
1540 if (ne->needs_probe)
1541 nodemgr_probe_ne(hi, ne, generation);
1542 }
1543 up_read(&class->subsys.rwsem);
1544
1545
1546 /* If we had a bus reset while we were scanning the bus, it is
1547 * possible that we did not probe all nodes. In that case, we
1548 * skip the clean up for now, since we could remove nodes that
1549 * were still on the bus. Another bus scan is pending which will
1550 * do the clean up eventually.
1551 *
1552 * Now let's tell the bus to rescan our devices. This may seem
1553 * like overhead, but the driver-model core will only scan a
1554 * device for a driver when either the device is added, or when a
1555 * new driver is added. A bus reset is a good reason to rescan
1556 * devices that were there before. For example, an sbp2 device
1557 * may become available for login, if the host that held it was
1558 * just removed. */
1559
1560 if (generation == get_hpsb_generation(host))
1561 WARN_ON(bus_rescan_devices(&ieee1394_bus_type));
1562
1563 return;
1564 }
1565
1566 static int nodemgr_send_resume_packet(struct hpsb_host *host)
1567 {
1568 struct hpsb_packet *packet;
1569 int error = -ENOMEM;
1570
1571 packet = hpsb_make_phypacket(host,
1572 EXTPHYPACKET_TYPE_RESUME |
1573 NODEID_TO_NODE(host->node_id) << PHYPACKET_PORT_SHIFT);
1574 if (packet) {
1575 packet->no_waiter = 1;
1576 packet->generation = get_hpsb_generation(host);
1577 error = hpsb_send_packet(packet);
1578 }
1579 if (error)
1580 HPSB_WARN("fw-host%d: Failed to broadcast resume packet",
1581 host->id);
1582 return error;
1583 }
1584
1585 /* Perform a few high-level IRM responsibilities. */
1586 static int nodemgr_do_irm_duties(struct hpsb_host *host, int cycles)
1587 {
1588 quadlet_t bc;
1589
1590 /* if irm_id == -1 then there is no IRM on this bus */
1591 if (!host->is_irm || host->irm_id == (nodeid_t)-1)
1592 return 1;
1593
1594 /* We are a 1394a-2000 compliant IRM. Set the validity bit. */
1595 host->csr.broadcast_channel |= 0x40000000;
1596
1597 /* If there is no bus manager then we should set the root node's
1598 * force_root bit to promote bus stability per the 1394
1599 * spec. (8.4.2.6) */
1600 if (host->busmgr_id == 0xffff && host->node_count > 1)
1601 {
1602 u16 root_node = host->node_count - 1;
1603
1604 /* get cycle master capability flag from root node */
1605 if (host->is_cycmst ||
1606 (!hpsb_read(host, LOCAL_BUS | root_node, get_hpsb_generation(host),
1607 (CSR_REGISTER_BASE + CSR_CONFIG_ROM + 2 * sizeof(quadlet_t)),
1608 &bc, sizeof(quadlet_t)) &&
1609 be32_to_cpu(bc) & 1 << CSR_CMC_SHIFT))
1610 hpsb_send_phy_config(host, root_node, -1);
1611 else {
1612 HPSB_DEBUG("The root node is not cycle master capable; "
1613 "selecting a new root node and resetting...");
1614
1615 if (cycles >= 5) {
1616 /* Oh screw it! Just leave the bus as it is */
1617 HPSB_DEBUG("Stopping reset loop for IRM sanity");
1618 return 1;
1619 }
1620
1621 hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1622 hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1623
1624 return 0;
1625 }
1626 }
1627
1628 /* Some devices suspend their ports while being connected to an inactive
1629 * host adapter, i.e. if connected before the low-level driver is
1630 * loaded. They become visible either when physically unplugged and
1631 * replugged, or when receiving a resume packet. Send one once. */
1632 if (!host->resume_packet_sent && !nodemgr_send_resume_packet(host))
1633 host->resume_packet_sent = 1;
1634
1635 return 1;
1636 }
1637
1638 /* We need to ensure that if we are not the IRM, that the IRM node is capable of
1639 * everything we can do, otherwise issue a bus reset and try to become the IRM
1640 * ourselves. */
1641 static int nodemgr_check_irm_capability(struct hpsb_host *host, int cycles)
1642 {
1643 quadlet_t bc;
1644 int status;
1645
1646 if (hpsb_disable_irm || host->is_irm)
1647 return 1;
1648
1649 status = hpsb_read(host, LOCAL_BUS | (host->irm_id),
1650 get_hpsb_generation(host),
1651 (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL),
1652 &bc, sizeof(quadlet_t));
1653
1654 if (status < 0 || !(be32_to_cpu(bc) & 0x80000000)) {
1655 /* The current irm node does not have a valid BROADCAST_CHANNEL
1656 * register and we do, so reset the bus with force_root set */
1657 HPSB_DEBUG("Current remote IRM is not 1394a-2000 compliant, resetting...");
1658
1659 if (cycles >= 5) {
1660 /* Oh screw it! Just leave the bus as it is */
1661 HPSB_DEBUG("Stopping reset loop for IRM sanity");
1662 return 1;
1663 }
1664
1665 hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1666 hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1667
1668 return 0;
1669 }
1670
1671 return 1;
1672 }
1673
1674 static int nodemgr_host_thread(void *__hi)
1675 {
1676 struct host_info *hi = (struct host_info *)__hi;
1677 struct hpsb_host *host = hi->host;
1678 unsigned int g, generation = 0;
1679 int i, reset_cycles = 0;
1680
1681 /* Setup our device-model entries */
1682 nodemgr_create_host_dev_files(host);
1683
1684 for (;;) {
1685 /* Sleep until next bus reset */
1686 set_current_state(TASK_INTERRUPTIBLE);
1687 if (get_hpsb_generation(host) == generation)
1688 schedule();
1689 __set_current_state(TASK_RUNNING);
1690
1691 /* Thread may have been woken up to freeze or to exit */
1692 if (try_to_freeze())
1693 continue;
1694 if (kthread_should_stop())
1695 goto exit;
1696
1697 if (mutex_lock_interruptible(&nodemgr_serialize)) {
1698 if (try_to_freeze())
1699 continue;
1700 goto exit;
1701 }
1702
1703 /* Pause for 1/4 second in 1/16 second intervals,
1704 * to make sure things settle down. */
1705 g = get_hpsb_generation(host);
1706 for (i = 0; i < 4 ; i++) {
1707 if (msleep_interruptible(63) || kthread_should_stop())
1708 goto unlock_exit;
1709
1710 /* Now get the generation in which the node ID's we collect
1711 * are valid. During the bus scan we will use this generation
1712 * for the read transactions, so that if another reset occurs
1713 * during the scan the transactions will fail instead of
1714 * returning bogus data. */
1715 generation = get_hpsb_generation(host);
1716
1717 /* If we get a reset before we are done waiting, then
1718 * start the the waiting over again */
1719 if (generation != g)
1720 g = generation, i = 0;
1721 }
1722
1723 if (!nodemgr_check_irm_capability(host, reset_cycles) ||
1724 !nodemgr_do_irm_duties(host, reset_cycles)) {
1725 reset_cycles++;
1726 mutex_unlock(&nodemgr_serialize);
1727 continue;
1728 }
1729 reset_cycles = 0;
1730
1731 /* Scan our nodes to get the bus options and create node
1732 * entries. This does not do the sysfs stuff, since that
1733 * would trigger uevents and such, which is a bad idea at
1734 * this point. */
1735 nodemgr_node_scan(hi, generation);
1736
1737 /* This actually does the full probe, with sysfs
1738 * registration. */
1739 nodemgr_node_probe(hi, generation);
1740
1741 /* Update some of our sysfs symlinks */
1742 nodemgr_update_host_dev_links(host);
1743
1744 mutex_unlock(&nodemgr_serialize);
1745 }
1746 unlock_exit:
1747 mutex_unlock(&nodemgr_serialize);
1748 exit:
1749 HPSB_VERBOSE("NodeMgr: Exiting thread");
1750 return 0;
1751 }
1752
1753 int nodemgr_for_each_host(void *__data, int (*cb)(struct hpsb_host *, void *))
1754 {
1755 struct class *class = &hpsb_host_class;
1756 struct class_device *cdev;
1757 struct hpsb_host *host;
1758 int error = 0;
1759
1760 down_read(&class->subsys.rwsem);
1761 list_for_each_entry(cdev, &class->children, node) {
1762 host = container_of(cdev, struct hpsb_host, class_dev);
1763
1764 if ((error = cb(host, __data)))
1765 break;
1766 }
1767 up_read(&class->subsys.rwsem);
1768
1769 return error;
1770 }
1771
1772 /* The following four convenience functions use a struct node_entry
1773 * for addressing a node on the bus. They are intended for use by any
1774 * process context, not just the nodemgr thread, so we need to be a
1775 * little careful when reading out the node ID and generation. The
1776 * thing that can go wrong is that we get the node ID, then a bus
1777 * reset occurs, and then we read the generation. The node ID is
1778 * possibly invalid, but the generation is current, and we end up
1779 * sending a packet to a the wrong node.
1780 *
1781 * The solution is to make sure we read the generation first, so that
1782 * if a reset occurs in the process, we end up with a stale generation
1783 * and the transactions will fail instead of silently using wrong node
1784 * ID's.
1785 */
1786
1787 void hpsb_node_fill_packet(struct node_entry *ne, struct hpsb_packet *pkt)
1788 {
1789 pkt->host = ne->host;
1790 pkt->generation = ne->generation;
1791 barrier();
1792 pkt->node_id = ne->nodeid;
1793 }
1794
1795 int hpsb_node_write(struct node_entry *ne, u64 addr,
1796 quadlet_t *buffer, size_t length)
1797 {
1798 unsigned int generation = ne->generation;
1799
1800 barrier();
1801 return hpsb_write(ne->host, ne->nodeid, generation,
1802 addr, buffer, length);
1803 }
1804
1805 static void nodemgr_add_host(struct hpsb_host *host)
1806 {
1807 struct host_info *hi;
1808
1809 hi = hpsb_create_hostinfo(&nodemgr_highlevel, host, sizeof(*hi));
1810 if (!hi) {
1811 HPSB_ERR("NodeMgr: out of memory in add host");
1812 return;
1813 }
1814 hi->host = host;
1815 hi->thread = kthread_run(nodemgr_host_thread, hi, "knodemgrd_%d",
1816 host->id);
1817 if (IS_ERR(hi->thread)) {
1818 HPSB_ERR("NodeMgr: cannot start thread for host %d", host->id);
1819 hpsb_destroy_hostinfo(&nodemgr_highlevel, host);
1820 }
1821 }
1822
1823 static void nodemgr_host_reset(struct hpsb_host *host)
1824 {
1825 struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1826
1827 if (hi) {
1828 HPSB_VERBOSE("NodeMgr: Processing reset for host %d", host->id);
1829 wake_up_process(hi->thread);
1830 }
1831 }
1832
1833 static void nodemgr_remove_host(struct hpsb_host *host)
1834 {
1835 struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1836
1837 if (hi) {
1838 kthread_stop(hi->thread);
1839 nodemgr_remove_host_dev(&host->device);
1840 }
1841 }
1842
1843 static struct hpsb_highlevel nodemgr_highlevel = {
1844 .name = "Node manager",
1845 .add_host = nodemgr_add_host,
1846 .host_reset = nodemgr_host_reset,
1847 .remove_host = nodemgr_remove_host,
1848 };
1849
1850 int init_ieee1394_nodemgr(void)
1851 {
1852 int error;
1853
1854 error = class_register(&nodemgr_ne_class);
1855 if (error)
1856 return error;
1857
1858 error = class_register(&nodemgr_ud_class);
1859 if (error) {
1860 class_unregister(&nodemgr_ne_class);
1861 return error;
1862 }
1863
1864 hpsb_register_highlevel(&nodemgr_highlevel);
1865 return 0;
1866 }
1867
1868 void cleanup_ieee1394_nodemgr(void)
1869 {
1870 hpsb_unregister_highlevel(&nodemgr_highlevel);
1871
1872 class_unregister(&nodemgr_ud_class);
1873 class_unregister(&nodemgr_ne_class);
1874 }
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