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Linux 2.6.21
[linux/fpc-iii.git] / drivers / ieee1394 / nodemgr.c
blobc5ace190bfe6719d78b290276ea92997a76b6563
1 /*
2 * Node information (ConfigROM) collection and management.
3 *
4 * Copyright (C) 2000 Andreas E. Bombe
5 * 2001-2003 Ben Collins <bcollins@debian.net>
6 *
7 * This code is licensed under the GPL. See the file COPYING in the root
8 * directory of the kernel sources for details.
9 */
10
11 #include <linux/bitmap.h>
12 #include <linux/kernel.h>
13 #include <linux/list.h>
14 #include <linux/slab.h>
15 #include <linux/delay.h>
16 #include <linux/kthread.h>
17 #include <linux/module.h>
18 #include <linux/moduleparam.h>
19 #include <linux/freezer.h>
20 #include <asm/atomic.h>
21
22 #include "csr.h"
23 #include "highlevel.h"
24 #include "hosts.h"
25 #include "ieee1394.h"
26 #include "ieee1394_core.h"
27 #include "ieee1394_hotplug.h"
28 #include "ieee1394_types.h"
29 #include "ieee1394_transactions.h"
30 #include "nodemgr.h"
31
32 static int ignore_drivers;
33 module_param(ignore_drivers, int, S_IRUGO | S_IWUSR);
34 MODULE_PARM_DESC(ignore_drivers, "Disable automatic probing for drivers.");
35
36 struct nodemgr_csr_info {
37 struct hpsb_host *host;
38 nodeid_t nodeid;
39 unsigned int generation;
40 unsigned int speed_unverified:1;
41 };
42
43
44 /*
45 * Correct the speed map entry. This is necessary
46 * - for nodes with link speed < phy speed,
47 * - for 1394b nodes with negotiated phy port speed < IEEE1394_SPEED_MAX.
48 * A possible speed is determined by trial and error, using quadlet reads.
49 */
50 static int nodemgr_check_speed(struct nodemgr_csr_info *ci, u64 addr,
51 quadlet_t *buffer)
52 {
53 quadlet_t q;
54 u8 i, *speed, old_speed, good_speed;
55 int error;
56
57 speed = &(ci->host->speed[NODEID_TO_NODE(ci->nodeid)]);
58 old_speed = *speed;
59 good_speed = IEEE1394_SPEED_MAX + 1;
60
61 /* Try every speed from S100 to old_speed.
62 * If we did it the other way around, a too low speed could be caught
63 * if the retry succeeded for some other reason, e.g. because the link
64 * just finished its initialization. */
65 for (i = IEEE1394_SPEED_100; i <= old_speed; i++) {
66 *speed = i;
67 error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
68 &q, sizeof(quadlet_t));
69 if (error)
70 break;
71 *buffer = q;
72 good_speed = i;
73 }
74 if (good_speed <= IEEE1394_SPEED_MAX) {
75 HPSB_DEBUG("Speed probe of node " NODE_BUS_FMT " yields %s",
76 NODE_BUS_ARGS(ci->host, ci->nodeid),
77 hpsb_speedto_str[good_speed]);
78 *speed = good_speed;
79 ci->speed_unverified = 0;
80 return 0;
81 }
82 *speed = old_speed;
83 return error;
84 }
85
86 static int nodemgr_bus_read(struct csr1212_csr *csr, u64 addr, u16 length,
87 void *buffer, void *__ci)
88 {
89 struct nodemgr_csr_info *ci = (struct nodemgr_csr_info*)__ci;
90 int i, error;
91
92 for (i = 1; ; i++) {
93 error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
94 buffer, length);
95 if (!error) {
96 ci->speed_unverified = 0;
97 break;
98 }
99 /* Give up after 3rd failure. */
100 if (i == 3)
101 break;
102
103 /* The ieee1394_core guessed the node's speed capability from
104 * the self ID. Check whether a lower speed works. */
105 if (ci->speed_unverified && length == sizeof(quadlet_t)) {
106 error = nodemgr_check_speed(ci, addr, buffer);
107 if (!error)
108 break;
109 }
110 if (msleep_interruptible(334))
111 return -EINTR;
112 }
113 return error;
114 }
115
116 static int nodemgr_get_max_rom(quadlet_t *bus_info_data, void *__ci)
117 {
118 return (CSR1212_BE32_TO_CPU(bus_info_data[2]) >> 8) & 0x3;
119 }
120
121 static struct csr1212_bus_ops nodemgr_csr_ops = {
122 .bus_read = nodemgr_bus_read,
123 .get_max_rom = nodemgr_get_max_rom
124 };
125
126
127 /*
128 * Basically what we do here is start off retrieving the bus_info block.
129 * From there will fill in some info about the node, verify it is of IEEE
130 * 1394 type, and that the crc checks out ok. After that we start off with
131 * the root directory, and subdirectories. To do this, we retrieve the
132 * quadlet header for a directory, find out the length, and retrieve the
133 * complete directory entry (be it a leaf or a directory). We then process
134 * it and add the info to our structure for that particular node.
135 *
136 * We verify CRC's along the way for each directory/block/leaf. The entire
137 * node structure is generic, and simply stores the information in a way
138 * that's easy to parse by the protocol interface.
139 */
140
141 /*
142 * The nodemgr relies heavily on the Driver Model for device callbacks and
143 * driver/device mappings. The old nodemgr used to handle all this itself,
144 * but now we are much simpler because of the LDM.
145 */
146
147 static DEFINE_MUTEX(nodemgr_serialize);
148
149 struct host_info {
150 struct hpsb_host *host;
151 struct list_head list;
152 struct task_struct *thread;
153 };
154
155 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv);
156 static int nodemgr_uevent(struct class_device *cdev, char **envp, int num_envp,
157 char *buffer, int buffer_size);
158 static void nodemgr_resume_ne(struct node_entry *ne);
159 static void nodemgr_remove_ne(struct node_entry *ne);
160 static struct node_entry *find_entry_by_guid(u64 guid);
161
162 struct bus_type ieee1394_bus_type = {
163 .name = "ieee1394",
164 .match = nodemgr_bus_match,
165 };
166
167 static void host_cls_release(struct class_device *class_dev)
168 {
169 put_device(&container_of((class_dev), struct hpsb_host, class_dev)->device);
170 }
171
172 struct class hpsb_host_class = {
173 .name = "ieee1394_host",
174 .release = host_cls_release,
175 };
176
177 static void ne_cls_release(struct class_device *class_dev)
178 {
179 put_device(&container_of((class_dev), struct node_entry, class_dev)->device);
180 }
181
182 static struct class nodemgr_ne_class = {
183 .name = "ieee1394_node",
184 .release = ne_cls_release,
185 };
186
187 static void ud_cls_release(struct class_device *class_dev)
188 {
189 put_device(&container_of((class_dev), struct unit_directory, class_dev)->device);
190 }
191
192 /* The name here is only so that unit directory hotplug works with old
193 * style hotplug, which only ever did unit directories anyway. */
194 static struct class nodemgr_ud_class = {
195 .name = "ieee1394",
196 .release = ud_cls_release,
197 .uevent = nodemgr_uevent,
198 };
199
200 static struct hpsb_highlevel nodemgr_highlevel;
201
202
203 static void nodemgr_release_ud(struct device *dev)
204 {
205 struct unit_directory *ud = container_of(dev, struct unit_directory, device);
206
207 if (ud->vendor_name_kv)
208 csr1212_release_keyval(ud->vendor_name_kv);
209 if (ud->model_name_kv)
210 csr1212_release_keyval(ud->model_name_kv);
211
212 kfree(ud);
213 }
214
215 static void nodemgr_release_ne(struct device *dev)
216 {
217 struct node_entry *ne = container_of(dev, struct node_entry, device);
218
219 if (ne->vendor_name_kv)
220 csr1212_release_keyval(ne->vendor_name_kv);
221
222 kfree(ne);
223 }
224
225
226 static void nodemgr_release_host(struct device *dev)
227 {
228 struct hpsb_host *host = container_of(dev, struct hpsb_host, device);
229
230 csr1212_destroy_csr(host->csr.rom);
231
232 kfree(host);
233 }
234
235 static int nodemgr_ud_platform_data;
236
237 static struct device nodemgr_dev_template_ud = {
238 .bus = &ieee1394_bus_type,
239 .release = nodemgr_release_ud,
240 .platform_data = &nodemgr_ud_platform_data,
241 };
242
243 static struct device nodemgr_dev_template_ne = {
244 .bus = &ieee1394_bus_type,
245 .release = nodemgr_release_ne,
246 };
247
248 /* This dummy driver prevents the host devices from being scanned. We have no
249 * useful drivers for them yet, and there would be a deadlock possible if the
250 * driver core scans the host device while the host's low-level driver (i.e.
251 * the host's parent device) is being removed. */
252 static struct device_driver nodemgr_mid_layer_driver = {
253 .bus = &ieee1394_bus_type,
254 .name = "nodemgr",
255 .owner = THIS_MODULE,
256 };
257
258 struct device nodemgr_dev_template_host = {
259 .bus = &ieee1394_bus_type,
260 .release = nodemgr_release_host,
261 };
262
263
264 #define fw_attr(class, class_type, field, type, format_string) \
265 static ssize_t fw_show_##class##_##field (struct device *dev, struct device_attribute *attr, char *buf)\
266 { \
267 class_type *class; \
268 class = container_of(dev, class_type, device); \
269 return sprintf(buf, format_string, (type)class->field); \
270 } \
271 static struct device_attribute dev_attr_##class##_##field = { \
272 .attr = {.name = __stringify(field), .mode = S_IRUGO }, \
273 .show = fw_show_##class##_##field, \
274 };
275
276 #define fw_attr_td(class, class_type, td_kv) \
277 static ssize_t fw_show_##class##_##td_kv (struct device *dev, struct device_attribute *attr, char *buf)\
278 { \
279 int len; \
280 class_type *class = container_of(dev, class_type, device); \
281 len = (class->td_kv->value.leaf.len - 2) * sizeof(quadlet_t); \
282 memcpy(buf, \
283 CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(class->td_kv), \
284 len); \
285 while ((buf + len - 1) == '\0') \
286 len--; \
287 buf[len++] = '\n'; \
288 buf[len] = '\0'; \
289 return len; \
290 } \
291 static struct device_attribute dev_attr_##class##_##td_kv = { \
292 .attr = {.name = __stringify(td_kv), .mode = S_IRUGO }, \
293 .show = fw_show_##class##_##td_kv, \
294 };
295
296
297 #define fw_drv_attr(field, type, format_string) \
298 static ssize_t fw_drv_show_##field (struct device_driver *drv, char *buf) \
299 { \
300 struct hpsb_protocol_driver *driver; \
301 driver = container_of(drv, struct hpsb_protocol_driver, driver); \
302 return sprintf(buf, format_string, (type)driver->field);\
303 } \
304 static struct driver_attribute driver_attr_drv_##field = { \
305 .attr = {.name = __stringify(field), .mode = S_IRUGO }, \
306 .show = fw_drv_show_##field, \
307 };
308
309
310 static ssize_t fw_show_ne_bus_options(struct device *dev, struct device_attribute *attr, char *buf)
311 {
312 struct node_entry *ne = container_of(dev, struct node_entry, device);
313
314 return sprintf(buf, "IRMC(%d) CMC(%d) ISC(%d) BMC(%d) PMC(%d) GEN(%d) "
315 "LSPD(%d) MAX_REC(%d) MAX_ROM(%d) CYC_CLK_ACC(%d)\n",
316 ne->busopt.irmc,
317 ne->busopt.cmc, ne->busopt.isc, ne->busopt.bmc,
318 ne->busopt.pmc, ne->busopt.generation, ne->busopt.lnkspd,
319 ne->busopt.max_rec,
320 ne->busopt.max_rom,
321 ne->busopt.cyc_clk_acc);
322 }
323 static DEVICE_ATTR(bus_options,S_IRUGO,fw_show_ne_bus_options,NULL);
324
325
326 #ifdef HPSB_DEBUG_TLABELS
327 static ssize_t fw_show_ne_tlabels_free(struct device *dev,
328 struct device_attribute *attr, char *buf)
329 {
330 struct node_entry *ne = container_of(dev, struct node_entry, device);
331 unsigned long flags;
332 unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
333 int tf;
334
335 spin_lock_irqsave(&hpsb_tlabel_lock, flags);
336 tf = 64 - bitmap_weight(tp, 64);
337 spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
338
339 return sprintf(buf, "%d\n", tf);
340 }
341 static DEVICE_ATTR(tlabels_free,S_IRUGO,fw_show_ne_tlabels_free,NULL);
342
343
344 static ssize_t fw_show_ne_tlabels_mask(struct device *dev,
345 struct device_attribute *attr, char *buf)
346 {
347 struct node_entry *ne = container_of(dev, struct node_entry, device);
348 unsigned long flags;
349 unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
350 u64 tm;
351
352 spin_lock_irqsave(&hpsb_tlabel_lock, flags);
353 #if (BITS_PER_LONG <= 32)
354 tm = ((u64)tp[0] << 32) + tp[1];
355 #else
356 tm = tp[0];
357 #endif
358 spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
359
360 return sprintf(buf, "0x%016llx\n", (unsigned long long)tm);
361 }
362 static DEVICE_ATTR(tlabels_mask, S_IRUGO, fw_show_ne_tlabels_mask, NULL);
363 #endif /* HPSB_DEBUG_TLABELS */
364
365
366 static ssize_t fw_set_ignore_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
367 {
368 struct unit_directory *ud = container_of(dev, struct unit_directory, device);
369 int state = simple_strtoul(buf, NULL, 10);
370
371 if (state == 1) {
372 ud->ignore_driver = 1;
373 down_write(&ieee1394_bus_type.subsys.rwsem);
374 device_release_driver(dev);
375 up_write(&ieee1394_bus_type.subsys.rwsem);
376 } else if (state == 0)
377 ud->ignore_driver = 0;
378
379 return count;
380 }
381 static ssize_t fw_get_ignore_driver(struct device *dev, struct device_attribute *attr, char *buf)
382 {
383 struct unit_directory *ud = container_of(dev, struct unit_directory, device);
384
385 return sprintf(buf, "%d\n", ud->ignore_driver);
386 }
387 static DEVICE_ATTR(ignore_driver, S_IWUSR | S_IRUGO, fw_get_ignore_driver, fw_set_ignore_driver);
388
389
390 static ssize_t fw_set_destroy_node(struct bus_type *bus, const char *buf, size_t count)
391 {
392 struct node_entry *ne;
393 u64 guid = (u64)simple_strtoull(buf, NULL, 16);
394
395 ne = find_entry_by_guid(guid);
396
397 if (ne == NULL || !ne->in_limbo)
398 return -EINVAL;
399
400 nodemgr_remove_ne(ne);
401
402 return count;
403 }
404 static ssize_t fw_get_destroy_node(struct bus_type *bus, char *buf)
405 {
406 return sprintf(buf, "You can destroy in_limbo nodes by writing their GUID to this file\n");
407 }
408 static BUS_ATTR(destroy_node, S_IWUSR | S_IRUGO, fw_get_destroy_node, fw_set_destroy_node);
409
410
411 static ssize_t fw_set_rescan(struct bus_type *bus, const char *buf,
412 size_t count)
413 {
414 int error = 0;
415
416 if (simple_strtoul(buf, NULL, 10) == 1)
417 error = bus_rescan_devices(&ieee1394_bus_type);
418 return error ? error : count;
419 }
420 static ssize_t fw_get_rescan(struct bus_type *bus, char *buf)
421 {
422 return sprintf(buf, "You can force a rescan of the bus for "
423 "drivers by writing a 1 to this file\n");
424 }
425 static BUS_ATTR(rescan, S_IWUSR | S_IRUGO, fw_get_rescan, fw_set_rescan);
426
427
428 static ssize_t fw_set_ignore_drivers(struct bus_type *bus, const char *buf, size_t count)
429 {
430 int state = simple_strtoul(buf, NULL, 10);
431
432 if (state == 1)
433 ignore_drivers = 1;
434 else if (state == 0)
435 ignore_drivers = 0;
436
437 return count;
438 }
439 static ssize_t fw_get_ignore_drivers(struct bus_type *bus, char *buf)
440 {
441 return sprintf(buf, "%d\n", ignore_drivers);
442 }
443 static BUS_ATTR(ignore_drivers, S_IWUSR | S_IRUGO, fw_get_ignore_drivers, fw_set_ignore_drivers);
444
445
446 struct bus_attribute *const fw_bus_attrs[] = {
447 &bus_attr_destroy_node,
448 &bus_attr_rescan,
449 &bus_attr_ignore_drivers,
450 NULL
451 };
452
453
454 fw_attr(ne, struct node_entry, capabilities, unsigned int, "0x%06x\n")
455 fw_attr(ne, struct node_entry, nodeid, unsigned int, "0x%04x\n")
456
457 fw_attr(ne, struct node_entry, vendor_id, unsigned int, "0x%06x\n")
458 fw_attr_td(ne, struct node_entry, vendor_name_kv)
459
460 fw_attr(ne, struct node_entry, guid, unsigned long long, "0x%016Lx\n")
461 fw_attr(ne, struct node_entry, guid_vendor_id, unsigned int, "0x%06x\n")
462 fw_attr(ne, struct node_entry, in_limbo, int, "%d\n");
463
464 static struct device_attribute *const fw_ne_attrs[] = {
465 &dev_attr_ne_guid,
466 &dev_attr_ne_guid_vendor_id,
467 &dev_attr_ne_capabilities,
468 &dev_attr_ne_vendor_id,
469 &dev_attr_ne_nodeid,
470 &dev_attr_bus_options,
471 #ifdef HPSB_DEBUG_TLABELS
472 &dev_attr_tlabels_free,
473 &dev_attr_tlabels_mask,
474 #endif
475 };
476
477
478
479 fw_attr(ud, struct unit_directory, address, unsigned long long, "0x%016Lx\n")
480 fw_attr(ud, struct unit_directory, length, int, "%d\n")
481 /* These are all dependent on the value being provided */
482 fw_attr(ud, struct unit_directory, vendor_id, unsigned int, "0x%06x\n")
483 fw_attr(ud, struct unit_directory, model_id, unsigned int, "0x%06x\n")
484 fw_attr(ud, struct unit_directory, specifier_id, unsigned int, "0x%06x\n")
485 fw_attr(ud, struct unit_directory, version, unsigned int, "0x%06x\n")
486 fw_attr_td(ud, struct unit_directory, vendor_name_kv)
487 fw_attr_td(ud, struct unit_directory, model_name_kv)
488
489 static struct device_attribute *const fw_ud_attrs[] = {
490 &dev_attr_ud_address,
491 &dev_attr_ud_length,
492 &dev_attr_ignore_driver,
493 };
494
495
496 fw_attr(host, struct hpsb_host, node_count, int, "%d\n")
497 fw_attr(host, struct hpsb_host, selfid_count, int, "%d\n")
498 fw_attr(host, struct hpsb_host, nodes_active, int, "%d\n")
499 fw_attr(host, struct hpsb_host, in_bus_reset, int, "%d\n")
500 fw_attr(host, struct hpsb_host, is_root, int, "%d\n")
501 fw_attr(host, struct hpsb_host, is_cycmst, int, "%d\n")
502 fw_attr(host, struct hpsb_host, is_irm, int, "%d\n")
503 fw_attr(host, struct hpsb_host, is_busmgr, int, "%d\n")
504
505 static struct device_attribute *const fw_host_attrs[] = {
506 &dev_attr_host_node_count,
507 &dev_attr_host_selfid_count,
508 &dev_attr_host_nodes_active,
509 &dev_attr_host_in_bus_reset,
510 &dev_attr_host_is_root,
511 &dev_attr_host_is_cycmst,
512 &dev_attr_host_is_irm,
513 &dev_attr_host_is_busmgr,
514 };
515
516
517 static ssize_t fw_show_drv_device_ids(struct device_driver *drv, char *buf)
518 {
519 struct hpsb_protocol_driver *driver;
520 struct ieee1394_device_id *id;
521 int length = 0;
522 char *scratch = buf;
523
524 driver = container_of(drv, struct hpsb_protocol_driver, driver);
525
526 for (id = driver->id_table; id->match_flags != 0; id++) {
527 int need_coma = 0;
528
529 if (id->match_flags & IEEE1394_MATCH_VENDOR_ID) {
530 length += sprintf(scratch, "vendor_id=0x%06x", id->vendor_id);
531 scratch = buf + length;
532 need_coma++;
533 }
534
535 if (id->match_flags & IEEE1394_MATCH_MODEL_ID) {
536 length += sprintf(scratch, "%smodel_id=0x%06x",
537 need_coma++ ? "," : "",
538 id->model_id);
539 scratch = buf + length;
540 }
541
542 if (id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) {
543 length += sprintf(scratch, "%sspecifier_id=0x%06x",
544 need_coma++ ? "," : "",
545 id->specifier_id);
546 scratch = buf + length;
547 }
548
549 if (id->match_flags & IEEE1394_MATCH_VERSION) {
550 length += sprintf(scratch, "%sversion=0x%06x",
551 need_coma++ ? "," : "",
552 id->version);
553 scratch = buf + length;
554 }
555
556 if (need_coma) {
557 *scratch++ = '\n';
558 length++;
559 }
560 }
561
562 return length;
563 }
564 static DRIVER_ATTR(device_ids,S_IRUGO,fw_show_drv_device_ids,NULL);
565
566
567 fw_drv_attr(name, const char *, "%s\n")
568
569 static struct driver_attribute *const fw_drv_attrs[] = {
570 &driver_attr_drv_name,
571 &driver_attr_device_ids,
572 };
573
574
575 static void nodemgr_create_drv_files(struct hpsb_protocol_driver *driver)
576 {
577 struct device_driver *drv = &driver->driver;
578 int i;
579
580 for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
581 if (driver_create_file(drv, fw_drv_attrs[i]))
582 goto fail;
583 return;
584 fail:
585 HPSB_ERR("Failed to add sysfs attribute for driver %s", driver->name);
586 }
587
588
589 static void nodemgr_remove_drv_files(struct hpsb_protocol_driver *driver)
590 {
591 struct device_driver *drv = &driver->driver;
592 int i;
593
594 for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
595 driver_remove_file(drv, fw_drv_attrs[i]);
596 }
597
598
599 static void nodemgr_create_ne_dev_files(struct node_entry *ne)
600 {
601 struct device *dev = &ne->device;
602 int i;
603
604 for (i = 0; i < ARRAY_SIZE(fw_ne_attrs); i++)
605 if (device_create_file(dev, fw_ne_attrs[i]))
606 goto fail;
607 return;
608 fail:
609 HPSB_ERR("Failed to add sysfs attribute for node %016Lx",
610 (unsigned long long)ne->guid);
611 }
612
613
614 static void nodemgr_create_host_dev_files(struct hpsb_host *host)
615 {
616 struct device *dev = &host->device;
617 int i;
618
619 for (i = 0; i < ARRAY_SIZE(fw_host_attrs); i++)
620 if (device_create_file(dev, fw_host_attrs[i]))
621 goto fail;
622 return;
623 fail:
624 HPSB_ERR("Failed to add sysfs attribute for host %d", host->id);
625 }
626
627
628 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
629 nodeid_t nodeid);
630
631 static void nodemgr_update_host_dev_links(struct hpsb_host *host)
632 {
633 struct device *dev = &host->device;
634 struct node_entry *ne;
635
636 sysfs_remove_link(&dev->kobj, "irm_id");
637 sysfs_remove_link(&dev->kobj, "busmgr_id");
638 sysfs_remove_link(&dev->kobj, "host_id");
639
640 if ((ne = find_entry_by_nodeid(host, host->irm_id)) &&
641 sysfs_create_link(&dev->kobj, &ne->device.kobj, "irm_id"))
642 goto fail;
643 if ((ne = find_entry_by_nodeid(host, host->busmgr_id)) &&
644 sysfs_create_link(&dev->kobj, &ne->device.kobj, "busmgr_id"))
645 goto fail;
646 if ((ne = find_entry_by_nodeid(host, host->node_id)) &&
647 sysfs_create_link(&dev->kobj, &ne->device.kobj, "host_id"))
648 goto fail;
649 return;
650 fail:
651 HPSB_ERR("Failed to update sysfs attributes for host %d", host->id);
652 }
653
654 static void nodemgr_create_ud_dev_files(struct unit_directory *ud)
655 {
656 struct device *dev = &ud->device;
657 int i;
658
659 for (i = 0; i < ARRAY_SIZE(fw_ud_attrs); i++)
660 if (device_create_file(dev, fw_ud_attrs[i]))
661 goto fail;
662 if (ud->flags & UNIT_DIRECTORY_SPECIFIER_ID)
663 if (device_create_file(dev, &dev_attr_ud_specifier_id))
664 goto fail;
665 if (ud->flags & UNIT_DIRECTORY_VERSION)
666 if (device_create_file(dev, &dev_attr_ud_version))
667 goto fail;
668 if (ud->flags & UNIT_DIRECTORY_VENDOR_ID) {
669 if (device_create_file(dev, &dev_attr_ud_vendor_id))
670 goto fail;
671 if (ud->vendor_name_kv &&
672 device_create_file(dev, &dev_attr_ud_vendor_name_kv))
673 goto fail;
674 }
675 if (ud->flags & UNIT_DIRECTORY_MODEL_ID) {
676 if (device_create_file(dev, &dev_attr_ud_model_id))
677 goto fail;
678 if (ud->model_name_kv &&
679 device_create_file(dev, &dev_attr_ud_model_name_kv))
680 goto fail;
681 }
682 return;
683 fail:
684 HPSB_ERR("Failed to add sysfs attributes for unit %s",
685 ud->device.bus_id);
686 }
687
688
689 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv)
690 {
691 struct hpsb_protocol_driver *driver;
692 struct unit_directory *ud;
693 struct ieee1394_device_id *id;
694
695 /* We only match unit directories */
696 if (dev->platform_data != &nodemgr_ud_platform_data)
697 return 0;
698
699 ud = container_of(dev, struct unit_directory, device);
700 if (ud->ne->in_limbo || ud->ignore_driver)
701 return 0;
702
703 /* We only match drivers of type hpsb_protocol_driver */
704 if (drv == &nodemgr_mid_layer_driver)
705 return 0;
706
707 driver = container_of(drv, struct hpsb_protocol_driver, driver);
708 for (id = driver->id_table; id->match_flags != 0; id++) {
709 if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) &&
710 id->vendor_id != ud->vendor_id)
711 continue;
712
713 if ((id->match_flags & IEEE1394_MATCH_MODEL_ID) &&
714 id->model_id != ud->model_id)
715 continue;
716
717 if ((id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) &&
718 id->specifier_id != ud->specifier_id)
719 continue;
720
721 if ((id->match_flags & IEEE1394_MATCH_VERSION) &&
722 id->version != ud->version)
723 continue;
724
725 return 1;
726 }
727
728 return 0;
729 }
730
731
732 static DEFINE_MUTEX(nodemgr_serialize_remove_uds);
733
734 static void nodemgr_remove_uds(struct node_entry *ne)
735 {
736 struct class_device *cdev;
737 struct unit_directory *tmp, *ud;
738
739 /* Iteration over nodemgr_ud_class.children has to be protected by
740 * nodemgr_ud_class.sem, but class_device_unregister() will eventually
741 * take nodemgr_ud_class.sem too. Therefore pick out one ud at a time,
742 * release the semaphore, and then unregister the ud. Since this code
743 * may be called from other contexts besides the knodemgrds, protect the
744 * gap after release of the semaphore by nodemgr_serialize_remove_uds.
745 */
746 mutex_lock(&nodemgr_serialize_remove_uds);
747 for (;;) {
748 ud = NULL;
749 down(&nodemgr_ud_class.sem);
750 list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
751 tmp = container_of(cdev, struct unit_directory,
752 class_dev);
753 if (tmp->ne == ne) {
754 ud = tmp;
755 break;
756 }
757 }
758 up(&nodemgr_ud_class.sem);
759 if (ud == NULL)
760 break;
761 class_device_unregister(&ud->class_dev);
762 device_unregister(&ud->device);
763 }
764 mutex_unlock(&nodemgr_serialize_remove_uds);
765 }
766
767
768 static void nodemgr_remove_ne(struct node_entry *ne)
769 {
770 struct device *dev;
771
772 dev = get_device(&ne->device);
773 if (!dev)
774 return;
775
776 HPSB_DEBUG("Node removed: ID:BUS[" NODE_BUS_FMT "] GUID[%016Lx]",
777 NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
778
779 nodemgr_remove_uds(ne);
780
781 class_device_unregister(&ne->class_dev);
782 device_unregister(dev);
783
784 put_device(dev);
785 }
786
787 static int __nodemgr_remove_host_dev(struct device *dev, void *data)
788 {
789 nodemgr_remove_ne(container_of(dev, struct node_entry, device));
790 return 0;
791 }
792
793 static void nodemgr_remove_host_dev(struct device *dev)
794 {
795 WARN_ON(device_for_each_child(dev, NULL, __nodemgr_remove_host_dev));
796 sysfs_remove_link(&dev->kobj, "irm_id");
797 sysfs_remove_link(&dev->kobj, "busmgr_id");
798 sysfs_remove_link(&dev->kobj, "host_id");
799 }
800
801
802 static void nodemgr_update_bus_options(struct node_entry *ne)
803 {
804 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
805 static const u16 mr[] = { 4, 64, 1024, 0};
806 #endif
807 quadlet_t busoptions = be32_to_cpu(ne->csr->bus_info_data[2]);
808
809 ne->busopt.irmc = (busoptions >> 31) & 1;
810 ne->busopt.cmc = (busoptions >> 30) & 1;
811 ne->busopt.isc = (busoptions >> 29) & 1;
812 ne->busopt.bmc = (busoptions >> 28) & 1;
813 ne->busopt.pmc = (busoptions >> 27) & 1;
814 ne->busopt.cyc_clk_acc = (busoptions >> 16) & 0xff;
815 ne->busopt.max_rec = 1 << (((busoptions >> 12) & 0xf) + 1);
816 ne->busopt.max_rom = (busoptions >> 8) & 0x3;
817 ne->busopt.generation = (busoptions >> 4) & 0xf;
818 ne->busopt.lnkspd = busoptions & 0x7;
819
820 HPSB_VERBOSE("NodeMgr: raw=0x%08x irmc=%d cmc=%d isc=%d bmc=%d pmc=%d "
821 "cyc_clk_acc=%d max_rec=%d max_rom=%d gen=%d lspd=%d",
822 busoptions, ne->busopt.irmc, ne->busopt.cmc,
823 ne->busopt.isc, ne->busopt.bmc, ne->busopt.pmc,
824 ne->busopt.cyc_clk_acc, ne->busopt.max_rec,
825 mr[ne->busopt.max_rom],
826 ne->busopt.generation, ne->busopt.lnkspd);
827 }
828
829
830 static struct node_entry *nodemgr_create_node(octlet_t guid, struct csr1212_csr *csr,
831 struct host_info *hi, nodeid_t nodeid,
832 unsigned int generation)
833 {
834 struct hpsb_host *host = hi->host;
835 struct node_entry *ne;
836
837 ne = kzalloc(sizeof(*ne), GFP_KERNEL);
838 if (!ne)
839 goto fail_alloc;
840
841 ne->host = host;
842 ne->nodeid = nodeid;
843 ne->generation = generation;
844 ne->needs_probe = 1;
845
846 ne->guid = guid;
847 ne->guid_vendor_id = (guid >> 40) & 0xffffff;
848 ne->csr = csr;
849
850 memcpy(&ne->device, &nodemgr_dev_template_ne,
851 sizeof(ne->device));
852 ne->device.parent = &host->device;
853 snprintf(ne->device.bus_id, BUS_ID_SIZE, "%016Lx",
854 (unsigned long long)(ne->guid));
855
856 ne->class_dev.dev = &ne->device;
857 ne->class_dev.class = &nodemgr_ne_class;
858 snprintf(ne->class_dev.class_id, BUS_ID_SIZE, "%016Lx",
859 (unsigned long long)(ne->guid));
860
861 if (device_register(&ne->device))
862 goto fail_devreg;
863 if (class_device_register(&ne->class_dev))
864 goto fail_classdevreg;
865 get_device(&ne->device);
866
867 nodemgr_create_ne_dev_files(ne);
868
869 nodemgr_update_bus_options(ne);
870
871 HPSB_DEBUG("%s added: ID:BUS[" NODE_BUS_FMT "] GUID[%016Lx]",
872 (host->node_id == nodeid) ? "Host" : "Node",
873 NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
874
875 return ne;
876
877 fail_classdevreg:
878 device_unregister(&ne->device);
879 fail_devreg:
880 kfree(ne);
881 fail_alloc:
882 HPSB_ERR("Failed to create node ID:BUS[" NODE_BUS_FMT "] GUID[%016Lx]",
883 NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
884
885 return NULL;
886 }
887
888
889 static struct node_entry *find_entry_by_guid(u64 guid)
890 {
891 struct class_device *cdev;
892 struct node_entry *ne, *ret_ne = NULL;
893
894 down(&nodemgr_ne_class.sem);
895 list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
896 ne = container_of(cdev, struct node_entry, class_dev);
897
898 if (ne->guid == guid) {
899 ret_ne = ne;
900 break;
901 }
902 }
903 up(&nodemgr_ne_class.sem);
904
905 return ret_ne;
906 }
907
908
909 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
910 nodeid_t nodeid)
911 {
912 struct class_device *cdev;
913 struct node_entry *ne, *ret_ne = NULL;
914
915 down(&nodemgr_ne_class.sem);
916 list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
917 ne = container_of(cdev, struct node_entry, class_dev);
918
919 if (ne->host == host && ne->nodeid == nodeid) {
920 ret_ne = ne;
921 break;
922 }
923 }
924 up(&nodemgr_ne_class.sem);
925
926 return ret_ne;
927 }
928
929
930 static void nodemgr_register_device(struct node_entry *ne,
931 struct unit_directory *ud, struct device *parent)
932 {
933 memcpy(&ud->device, &nodemgr_dev_template_ud,
934 sizeof(ud->device));
935
936 ud->device.parent = parent;
937
938 snprintf(ud->device.bus_id, BUS_ID_SIZE, "%s-%u",
939 ne->device.bus_id, ud->id);
940
941 ud->class_dev.dev = &ud->device;
942 ud->class_dev.class = &nodemgr_ud_class;
943 snprintf(ud->class_dev.class_id, BUS_ID_SIZE, "%s-%u",
944 ne->device.bus_id, ud->id);
945
946 if (device_register(&ud->device))
947 goto fail_devreg;
948 if (class_device_register(&ud->class_dev))
949 goto fail_classdevreg;
950 get_device(&ud->device);
951
952 nodemgr_create_ud_dev_files(ud);
953
954 return;
955
956 fail_classdevreg:
957 device_unregister(&ud->device);
958 fail_devreg:
959 HPSB_ERR("Failed to create unit %s", ud->device.bus_id);
960 }
961
962
963 /* This implementation currently only scans the config rom and its
964 * immediate unit directories looking for software_id and
965 * software_version entries, in order to get driver autoloading working. */
966 static struct unit_directory *nodemgr_process_unit_directory
967 (struct host_info *hi, struct node_entry *ne, struct csr1212_keyval *ud_kv,
968 unsigned int *id, struct unit_directory *parent)
969 {
970 struct unit_directory *ud;
971 struct unit_directory *ud_child = NULL;
972 struct csr1212_dentry *dentry;
973 struct csr1212_keyval *kv;
974 u8 last_key_id = 0;
975
976 ud = kzalloc(sizeof(*ud), GFP_KERNEL);
977 if (!ud)
978 goto unit_directory_error;
979
980 ud->ne = ne;
981 ud->ignore_driver = ignore_drivers;
982 ud->address = ud_kv->offset + CSR1212_CONFIG_ROM_SPACE_BASE;
983 ud->ud_kv = ud_kv;
984 ud->id = (*id)++;
985
986 csr1212_for_each_dir_entry(ne->csr, kv, ud_kv, dentry) {
987 switch (kv->key.id) {
988 case CSR1212_KV_ID_VENDOR:
989 if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
990 ud->vendor_id = kv->value.immediate;
991 ud->flags |= UNIT_DIRECTORY_VENDOR_ID;
992 }
993 break;
994
995 case CSR1212_KV_ID_MODEL:
996 ud->model_id = kv->value.immediate;
997 ud->flags |= UNIT_DIRECTORY_MODEL_ID;
998 break;
999
1000 case CSR1212_KV_ID_SPECIFIER_ID:
1001 ud->specifier_id = kv->value.immediate;
1002 ud->flags |= UNIT_DIRECTORY_SPECIFIER_ID;
1003 break;
1004
1005 case CSR1212_KV_ID_VERSION:
1006 ud->version = kv->value.immediate;
1007 ud->flags |= UNIT_DIRECTORY_VERSION;
1008 break;
1009
1010 case CSR1212_KV_ID_DESCRIPTOR:
1011 if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1012 CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1013 CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1014 CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1015 CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1016 CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1017 switch (last_key_id) {
1018 case CSR1212_KV_ID_VENDOR:
1019 ud->vendor_name_kv = kv;
1020 csr1212_keep_keyval(kv);
1021 break;
1022
1023 case CSR1212_KV_ID_MODEL:
1024 ud->model_name_kv = kv;
1025 csr1212_keep_keyval(kv);
1026 break;
1027
1028 }
1029 } /* else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) ... */
1030 break;
1031
1032 case CSR1212_KV_ID_DEPENDENT_INFO:
1033 /* Logical Unit Number */
1034 if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
1035 if (ud->flags & UNIT_DIRECTORY_HAS_LUN) {
1036 ud_child = kmemdup(ud, sizeof(*ud_child), GFP_KERNEL);
1037 if (!ud_child)
1038 goto unit_directory_error;
1039 nodemgr_register_device(ne, ud_child, &ne->device);
1040 ud_child = NULL;
1041
1042 ud->id = (*id)++;
1043 }
1044 ud->lun = kv->value.immediate;
1045 ud->flags |= UNIT_DIRECTORY_HAS_LUN;
1046
1047 /* Logical Unit Directory */
1048 } else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) {
1049 /* This should really be done in SBP2 as this is
1050 * doing SBP2 specific parsing.
1051 */
1052
1053 /* first register the parent unit */
1054 ud->flags |= UNIT_DIRECTORY_HAS_LUN_DIRECTORY;
1055 if (ud->device.bus != &ieee1394_bus_type)
1056 nodemgr_register_device(ne, ud, &ne->device);
1057
1058 /* process the child unit */
1059 ud_child = nodemgr_process_unit_directory(hi, ne, kv, id, ud);
1060
1061 if (ud_child == NULL)
1062 break;
1063
1064 /* inherit unspecified values, the driver core picks it up */
1065 if ((ud->flags & UNIT_DIRECTORY_MODEL_ID) &&
1066 !(ud_child->flags & UNIT_DIRECTORY_MODEL_ID))
1067 {
1068 ud_child->flags |= UNIT_DIRECTORY_MODEL_ID;
1069 ud_child->model_id = ud->model_id;
1070 }
1071 if ((ud->flags & UNIT_DIRECTORY_SPECIFIER_ID) &&
1072 !(ud_child->flags & UNIT_DIRECTORY_SPECIFIER_ID))
1073 {
1074 ud_child->flags |= UNIT_DIRECTORY_SPECIFIER_ID;
1075 ud_child->specifier_id = ud->specifier_id;
1076 }
1077 if ((ud->flags & UNIT_DIRECTORY_VERSION) &&
1078 !(ud_child->flags & UNIT_DIRECTORY_VERSION))
1079 {
1080 ud_child->flags |= UNIT_DIRECTORY_VERSION;
1081 ud_child->version = ud->version;
1082 }
1083
1084 /* register the child unit */
1085 ud_child->flags |= UNIT_DIRECTORY_LUN_DIRECTORY;
1086 nodemgr_register_device(ne, ud_child, &ud->device);
1087 }
1088
1089 break;
1090
1091 default:
1092 break;
1093 }
1094 last_key_id = kv->key.id;
1095 }
1096
1097 /* do not process child units here and only if not already registered */
1098 if (!parent && ud->device.bus != &ieee1394_bus_type)
1099 nodemgr_register_device(ne, ud, &ne->device);
1100
1101 return ud;
1102
1103 unit_directory_error:
1104 kfree(ud);
1105 return NULL;
1106 }
1107
1108
1109 static void nodemgr_process_root_directory(struct host_info *hi, struct node_entry *ne)
1110 {
1111 unsigned int ud_id = 0;
1112 struct csr1212_dentry *dentry;
1113 struct csr1212_keyval *kv;
1114 u8 last_key_id = 0;
1115
1116 ne->needs_probe = 0;
1117
1118 csr1212_for_each_dir_entry(ne->csr, kv, ne->csr->root_kv, dentry) {
1119 switch (kv->key.id) {
1120 case CSR1212_KV_ID_VENDOR:
1121 ne->vendor_id = kv->value.immediate;
1122 break;
1123
1124 case CSR1212_KV_ID_NODE_CAPABILITIES:
1125 ne->capabilities = kv->value.immediate;
1126 break;
1127
1128 case CSR1212_KV_ID_UNIT:
1129 nodemgr_process_unit_directory(hi, ne, kv, &ud_id, NULL);
1130 break;
1131
1132 case CSR1212_KV_ID_DESCRIPTOR:
1133 if (last_key_id == CSR1212_KV_ID_VENDOR) {
1134 if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1135 CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1136 CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1137 CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1138 CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1139 CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1140 ne->vendor_name_kv = kv;
1141 csr1212_keep_keyval(kv);
1142 }
1143 }
1144 break;
1145 }
1146 last_key_id = kv->key.id;
1147 }
1148
1149 if (ne->vendor_name_kv &&
1150 device_create_file(&ne->device, &dev_attr_ne_vendor_name_kv))
1151 goto fail;
1152 return;
1153 fail:
1154 HPSB_ERR("Failed to add sysfs attribute for node %016Lx",
1155 (unsigned long long)ne->guid);
1156 }
1157
1158 #ifdef CONFIG_HOTPLUG
1159
1160 static int nodemgr_uevent(struct class_device *cdev, char **envp, int num_envp,
1161 char *buffer, int buffer_size)
1162 {
1163 struct unit_directory *ud;
1164 int i = 0;
1165 int length = 0;
1166 /* ieee1394:venNmoNspNverN */
1167 char buf[8 + 1 + 3 + 8 + 2 + 8 + 2 + 8 + 3 + 8 + 1];
1168
1169 if (!cdev)
1170 return -ENODEV;
1171
1172 ud = container_of(cdev, struct unit_directory, class_dev);
1173
1174 if (ud->ne->in_limbo || ud->ignore_driver)
1175 return -ENODEV;
1176
1177 #define PUT_ENVP(fmt,val) \
1178 do { \
1179 int printed; \
1180 envp[i++] = buffer; \
1181 printed = snprintf(buffer, buffer_size - length, \
1182 fmt, val); \
1183 if ((buffer_size - (length+printed) <= 0) || (i >= num_envp)) \
1184 return -ENOMEM; \
1185 length += printed+1; \
1186 buffer += printed+1; \
1187 } while (0)
1188
1189 PUT_ENVP("VENDOR_ID=%06x", ud->vendor_id);
1190 PUT_ENVP("MODEL_ID=%06x", ud->model_id);
1191 PUT_ENVP("GUID=%016Lx", (unsigned long long)ud->ne->guid);
1192 PUT_ENVP("SPECIFIER_ID=%06x", ud->specifier_id);
1193 PUT_ENVP("VERSION=%06x", ud->version);
1194 snprintf(buf, sizeof(buf), "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
1195 ud->vendor_id,
1196 ud->model_id,
1197 ud->specifier_id,
1198 ud->version);
1199 PUT_ENVP("MODALIAS=%s", buf);
1200
1201 #undef PUT_ENVP
1202
1203 envp[i] = NULL;
1204
1205 return 0;
1206 }
1207
1208 #else
1209
1210 static int nodemgr_uevent(struct class_device *cdev, char **envp, int num_envp,
1211 char *buffer, int buffer_size)
1212 {
1213 return -ENODEV;
1214 }
1215
1216 #endif /* CONFIG_HOTPLUG */
1217
1218
1219 int __hpsb_register_protocol(struct hpsb_protocol_driver *drv,
1220 struct module *owner)
1221 {
1222 int error;
1223
1224 drv->driver.bus = &ieee1394_bus_type;
1225 drv->driver.owner = owner;
1226 drv->driver.name = drv->name;
1227
1228 /* This will cause a probe for devices */
1229 error = driver_register(&drv->driver);
1230 if (!error)
1231 nodemgr_create_drv_files(drv);
1232 return error;
1233 }
1234
1235 void hpsb_unregister_protocol(struct hpsb_protocol_driver *driver)
1236 {
1237 nodemgr_remove_drv_files(driver);
1238 /* This will subsequently disconnect all devices that our driver
1239 * is attached to. */
1240 driver_unregister(&driver->driver);
1241 }
1242
1243
1244 /*
1245 * This function updates nodes that were present on the bus before the
1246 * reset and still are after the reset. The nodeid and the config rom
1247 * may have changed, and the drivers managing this device must be
1248 * informed that this device just went through a bus reset, to allow
1249 * the to take whatever actions required.
1250 */
1251 static void nodemgr_update_node(struct node_entry *ne, struct csr1212_csr *csr,
1252 struct host_info *hi, nodeid_t nodeid,
1253 unsigned int generation)
1254 {
1255 if (ne->nodeid != nodeid) {
1256 HPSB_DEBUG("Node changed: " NODE_BUS_FMT " -> " NODE_BUS_FMT,
1257 NODE_BUS_ARGS(ne->host, ne->nodeid),
1258 NODE_BUS_ARGS(ne->host, nodeid));
1259 ne->nodeid = nodeid;
1260 }
1261
1262 if (ne->busopt.generation != ((be32_to_cpu(csr->bus_info_data[2]) >> 4) & 0xf)) {
1263 kfree(ne->csr->private);
1264 csr1212_destroy_csr(ne->csr);
1265 ne->csr = csr;
1266
1267 /* If the node's configrom generation has changed, we
1268 * unregister all the unit directories. */
1269 nodemgr_remove_uds(ne);
1270
1271 nodemgr_update_bus_options(ne);
1272
1273 /* Mark the node as new, so it gets re-probed */
1274 ne->needs_probe = 1;
1275 } else {
1276 /* old cache is valid, so update its generation */
1277 struct nodemgr_csr_info *ci = ne->csr->private;
1278 ci->generation = generation;
1279 /* free the partially filled now unneeded new cache */
1280 kfree(csr->private);
1281 csr1212_destroy_csr(csr);
1282 }
1283
1284 if (ne->in_limbo)
1285 nodemgr_resume_ne(ne);
1286
1287 /* Mark the node current */
1288 ne->generation = generation;
1289 }
1290
1291
1292
1293 static void nodemgr_node_scan_one(struct host_info *hi,
1294 nodeid_t nodeid, int generation)
1295 {
1296 struct hpsb_host *host = hi->host;
1297 struct node_entry *ne;
1298 octlet_t guid;
1299 struct csr1212_csr *csr;
1300 struct nodemgr_csr_info *ci;
1301 u8 *speed;
1302
1303 ci = kmalloc(sizeof(*ci), GFP_KERNEL);
1304 if (!ci)
1305 return;
1306
1307 ci->host = host;
1308 ci->nodeid = nodeid;
1309 ci->generation = generation;
1310
1311 /* Prepare for speed probe which occurs when reading the ROM */
1312 speed = &(host->speed[NODEID_TO_NODE(nodeid)]);
1313 if (*speed > host->csr.lnk_spd)
1314 *speed = host->csr.lnk_spd;
1315 ci->speed_unverified = *speed > IEEE1394_SPEED_100;
1316
1317 /* We need to detect when the ConfigROM's generation has changed,
1318 * so we only update the node's info when it needs to be. */
1319
1320 csr = csr1212_create_csr(&nodemgr_csr_ops, 5 * sizeof(quadlet_t), ci);
1321 if (!csr || csr1212_parse_csr(csr) != CSR1212_SUCCESS) {
1322 HPSB_ERR("Error parsing configrom for node " NODE_BUS_FMT,
1323 NODE_BUS_ARGS(host, nodeid));
1324 if (csr)
1325 csr1212_destroy_csr(csr);
1326 kfree(ci);
1327 return;
1328 }
1329
1330 if (csr->bus_info_data[1] != IEEE1394_BUSID_MAGIC) {
1331 /* This isn't a 1394 device, but we let it slide. There
1332 * was a report of a device with broken firmware which
1333 * reported '2394' instead of '1394', which is obviously a
1334 * mistake. One would hope that a non-1394 device never
1335 * gets connected to Firewire bus. If someone does, we
1336 * shouldn't be held responsible, so we'll allow it with a
1337 * warning. */
1338 HPSB_WARN("Node " NODE_BUS_FMT " has invalid busID magic [0x%08x]",
1339 NODE_BUS_ARGS(host, nodeid), csr->bus_info_data[1]);
1340 }
1341
1342 guid = ((u64)be32_to_cpu(csr->bus_info_data[3]) << 32) | be32_to_cpu(csr->bus_info_data[4]);
1343 ne = find_entry_by_guid(guid);
1344
1345 if (ne && ne->host != host && ne->in_limbo) {
1346 /* Must have moved this device from one host to another */
1347 nodemgr_remove_ne(ne);
1348 ne = NULL;
1349 }
1350
1351 if (!ne)
1352 nodemgr_create_node(guid, csr, hi, nodeid, generation);
1353 else
1354 nodemgr_update_node(ne, csr, hi, nodeid, generation);
1355 }
1356
1357
1358 static void nodemgr_node_scan(struct host_info *hi, int generation)
1359 {
1360 int count;
1361 struct hpsb_host *host = hi->host;
1362 struct selfid *sid = (struct selfid *)host->topology_map;
1363 nodeid_t nodeid = LOCAL_BUS;
1364
1365 /* Scan each node on the bus */
1366 for (count = host->selfid_count; count; count--, sid++) {
1367 if (sid->extended)
1368 continue;
1369
1370 if (!sid->link_active) {
1371 nodeid++;
1372 continue;
1373 }
1374 nodemgr_node_scan_one(hi, nodeid++, generation);
1375 }
1376 }
1377
1378
1379 static void nodemgr_suspend_ne(struct node_entry *ne)
1380 {
1381 struct class_device *cdev;
1382 struct unit_directory *ud;
1383
1384 HPSB_DEBUG("Node suspended: ID:BUS[" NODE_BUS_FMT "] GUID[%016Lx]",
1385 NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1386
1387 ne->in_limbo = 1;
1388 WARN_ON(device_create_file(&ne->device, &dev_attr_ne_in_limbo));
1389
1390 down(&nodemgr_ud_class.sem);
1391 list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1392 ud = container_of(cdev, struct unit_directory, class_dev);
1393 if (ud->ne != ne)
1394 continue;
1395
1396 down_write(&ieee1394_bus_type.subsys.rwsem);
1397 if (ud->device.driver &&
1398 (!ud->device.driver->suspend ||
1399 ud->device.driver->suspend(&ud->device, PMSG_SUSPEND)))
1400 device_release_driver(&ud->device);
1401 up_write(&ieee1394_bus_type.subsys.rwsem);
1402 }
1403 up(&nodemgr_ud_class.sem);
1404 }
1405
1406
1407 static void nodemgr_resume_ne(struct node_entry *ne)
1408 {
1409 struct class_device *cdev;
1410 struct unit_directory *ud;
1411
1412 ne->in_limbo = 0;
1413 device_remove_file(&ne->device, &dev_attr_ne_in_limbo);
1414
1415 down(&nodemgr_ud_class.sem);
1416 list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1417 ud = container_of(cdev, struct unit_directory, class_dev);
1418 if (ud->ne != ne)
1419 continue;
1420
1421 down_read(&ieee1394_bus_type.subsys.rwsem);
1422 if (ud->device.driver && ud->device.driver->resume)
1423 ud->device.driver->resume(&ud->device);
1424 up_read(&ieee1394_bus_type.subsys.rwsem);
1425 }
1426 up(&nodemgr_ud_class.sem);
1427
1428 HPSB_DEBUG("Node resumed: ID:BUS[" NODE_BUS_FMT "] GUID[%016Lx]",
1429 NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1430 }
1431
1432
1433 static void nodemgr_update_pdrv(struct node_entry *ne)
1434 {
1435 struct unit_directory *ud;
1436 struct hpsb_protocol_driver *pdrv;
1437 struct class_device *cdev;
1438
1439 down(&nodemgr_ud_class.sem);
1440 list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1441 ud = container_of(cdev, struct unit_directory, class_dev);
1442 if (ud->ne != ne)
1443 continue;
1444
1445 down_write(&ieee1394_bus_type.subsys.rwsem);
1446 if (ud->device.driver) {
1447 pdrv = container_of(ud->device.driver,
1448 struct hpsb_protocol_driver,
1449 driver);
1450 if (pdrv->update && pdrv->update(ud))
1451 device_release_driver(&ud->device);
1452 }
1453 up_write(&ieee1394_bus_type.subsys.rwsem);
1454 }
1455 up(&nodemgr_ud_class.sem);
1456 }
1457
1458
1459 /* Write the BROADCAST_CHANNEL as per IEEE1394a 8.3.2.3.11 and 8.4.2.3. This
1460 * seems like an optional service but in the end it is practically mandatory
1461 * as a consequence of these clauses.
1462 *
1463 * Note that we cannot do a broadcast write to all nodes at once because some
1464 * pre-1394a devices would hang. */
1465 static void nodemgr_irm_write_bc(struct node_entry *ne, int generation)
1466 {
1467 const u64 bc_addr = (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL);
1468 quadlet_t bc_remote, bc_local;
1469 int error;
1470
1471 if (!ne->host->is_irm || ne->generation != generation ||
1472 ne->nodeid == ne->host->node_id)
1473 return;
1474
1475 bc_local = cpu_to_be32(ne->host->csr.broadcast_channel);
1476
1477 /* Check if the register is implemented and 1394a compliant. */
1478 error = hpsb_read(ne->host, ne->nodeid, generation, bc_addr, &bc_remote,
1479 sizeof(bc_remote));
1480 if (!error && bc_remote & cpu_to_be32(0x80000000) &&
1481 bc_remote != bc_local)
1482 hpsb_node_write(ne, bc_addr, &bc_local, sizeof(bc_local));
1483 }
1484
1485
1486 static void nodemgr_probe_ne(struct host_info *hi, struct node_entry *ne, int generation)
1487 {
1488 struct device *dev;
1489
1490 if (ne->host != hi->host || ne->in_limbo)
1491 return;
1492
1493 dev = get_device(&ne->device);
1494 if (!dev)
1495 return;
1496
1497 nodemgr_irm_write_bc(ne, generation);
1498
1499 /* If "needs_probe", then this is either a new or changed node we
1500 * rescan totally. If the generation matches for an existing node
1501 * (one that existed prior to the bus reset) we send update calls
1502 * down to the drivers. Otherwise, this is a dead node and we
1503 * suspend it. */
1504 if (ne->needs_probe)
1505 nodemgr_process_root_directory(hi, ne);
1506 else if (ne->generation == generation)
1507 nodemgr_update_pdrv(ne);
1508 else
1509 nodemgr_suspend_ne(ne);
1510
1511 put_device(dev);
1512 }
1513
1514
1515 static void nodemgr_node_probe(struct host_info *hi, int generation)
1516 {
1517 struct hpsb_host *host = hi->host;
1518 struct class_device *cdev;
1519 struct node_entry *ne;
1520
1521 /* Do some processing of the nodes we've probed. This pulls them
1522 * into the sysfs layer if needed, and can result in processing of
1523 * unit-directories, or just updating the node and it's
1524 * unit-directories.
1525 *
1526 * Run updates before probes. Usually, updates are time-critical
1527 * while probes are time-consuming. (Well, those probes need some
1528 * improvement...) */
1529
1530 down(&nodemgr_ne_class.sem);
1531 list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
1532 ne = container_of(cdev, struct node_entry, class_dev);
1533 if (!ne->needs_probe)
1534 nodemgr_probe_ne(hi, ne, generation);
1535 }
1536 list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
1537 ne = container_of(cdev, struct node_entry, class_dev);
1538 if (ne->needs_probe)
1539 nodemgr_probe_ne(hi, ne, generation);
1540 }
1541 up(&nodemgr_ne_class.sem);
1542
1543
1544 /* If we had a bus reset while we were scanning the bus, it is
1545 * possible that we did not probe all nodes. In that case, we
1546 * skip the clean up for now, since we could remove nodes that
1547 * were still on the bus. Another bus scan is pending which will
1548 * do the clean up eventually.
1549 *
1550 * Now let's tell the bus to rescan our devices. This may seem
1551 * like overhead, but the driver-model core will only scan a
1552 * device for a driver when either the device is added, or when a
1553 * new driver is added. A bus reset is a good reason to rescan
1554 * devices that were there before. For example, an sbp2 device
1555 * may become available for login, if the host that held it was
1556 * just removed. */
1557
1558 if (generation == get_hpsb_generation(host))
1559 if (bus_rescan_devices(&ieee1394_bus_type))
1560 HPSB_DEBUG("bus_rescan_devices had an error");
1561 }
1562
1563 static int nodemgr_send_resume_packet(struct hpsb_host *host)
1564 {
1565 struct hpsb_packet *packet;
1566 int error = -ENOMEM;
1567
1568 packet = hpsb_make_phypacket(host,
1569 EXTPHYPACKET_TYPE_RESUME |
1570 NODEID_TO_NODE(host->node_id) << PHYPACKET_PORT_SHIFT);
1571 if (packet) {
1572 packet->no_waiter = 1;
1573 packet->generation = get_hpsb_generation(host);
1574 error = hpsb_send_packet(packet);
1575 }
1576 if (error)
1577 HPSB_WARN("fw-host%d: Failed to broadcast resume packet",
1578 host->id);
1579 return error;
1580 }
1581
1582 /* Perform a few high-level IRM responsibilities. */
1583 static int nodemgr_do_irm_duties(struct hpsb_host *host, int cycles)
1584 {
1585 quadlet_t bc;
1586
1587 /* if irm_id == -1 then there is no IRM on this bus */
1588 if (!host->is_irm || host->irm_id == (nodeid_t)-1)
1589 return 1;
1590
1591 /* We are a 1394a-2000 compliant IRM. Set the validity bit. */
1592 host->csr.broadcast_channel |= 0x40000000;
1593
1594 /* If there is no bus manager then we should set the root node's
1595 * force_root bit to promote bus stability per the 1394
1596 * spec. (8.4.2.6) */
1597 if (host->busmgr_id == 0xffff && host->node_count > 1)
1598 {
1599 u16 root_node = host->node_count - 1;
1600
1601 /* get cycle master capability flag from root node */
1602 if (host->is_cycmst ||
1603 (!hpsb_read(host, LOCAL_BUS | root_node, get_hpsb_generation(host),
1604 (CSR_REGISTER_BASE + CSR_CONFIG_ROM + 2 * sizeof(quadlet_t)),
1605 &bc, sizeof(quadlet_t)) &&
1606 be32_to_cpu(bc) & 1 << CSR_CMC_SHIFT))
1607 hpsb_send_phy_config(host, root_node, -1);
1608 else {
1609 HPSB_DEBUG("The root node is not cycle master capable; "
1610 "selecting a new root node and resetting...");
1611
1612 if (cycles >= 5) {
1613 /* Oh screw it! Just leave the bus as it is */
1614 HPSB_DEBUG("Stopping reset loop for IRM sanity");
1615 return 1;
1616 }
1617
1618 hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1619 hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1620
1621 return 0;
1622 }
1623 }
1624
1625 /* Some devices suspend their ports while being connected to an inactive
1626 * host adapter, i.e. if connected before the low-level driver is
1627 * loaded. They become visible either when physically unplugged and
1628 * replugged, or when receiving a resume packet. Send one once. */
1629 if (!host->resume_packet_sent && !nodemgr_send_resume_packet(host))
1630 host->resume_packet_sent = 1;
1631
1632 return 1;
1633 }
1634
1635 /* We need to ensure that if we are not the IRM, that the IRM node is capable of
1636 * everything we can do, otherwise issue a bus reset and try to become the IRM
1637 * ourselves. */
1638 static int nodemgr_check_irm_capability(struct hpsb_host *host, int cycles)
1639 {
1640 quadlet_t bc;
1641 int status;
1642
1643 if (hpsb_disable_irm || host->is_irm)
1644 return 1;
1645
1646 status = hpsb_read(host, LOCAL_BUS | (host->irm_id),
1647 get_hpsb_generation(host),
1648 (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL),
1649 &bc, sizeof(quadlet_t));
1650
1651 if (status < 0 || !(be32_to_cpu(bc) & 0x80000000)) {
1652 /* The current irm node does not have a valid BROADCAST_CHANNEL
1653 * register and we do, so reset the bus with force_root set */
1654 HPSB_DEBUG("Current remote IRM is not 1394a-2000 compliant, resetting...");
1655
1656 if (cycles >= 5) {
1657 /* Oh screw it! Just leave the bus as it is */
1658 HPSB_DEBUG("Stopping reset loop for IRM sanity");
1659 return 1;
1660 }
1661
1662 hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1663 hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1664
1665 return 0;
1666 }
1667
1668 return 1;
1669 }
1670
1671 static int nodemgr_host_thread(void *__hi)
1672 {
1673 struct host_info *hi = (struct host_info *)__hi;
1674 struct hpsb_host *host = hi->host;
1675 unsigned int g, generation = 0;
1676 int i, reset_cycles = 0;
1677
1678 /* Setup our device-model entries */
1679 nodemgr_create_host_dev_files(host);
1680
1681 for (;;) {
1682 /* Sleep until next bus reset */
1683 set_current_state(TASK_INTERRUPTIBLE);
1684 if (get_hpsb_generation(host) == generation &&
1685 !kthread_should_stop())
1686 schedule();
1687 __set_current_state(TASK_RUNNING);
1688
1689 /* Thread may have been woken up to freeze or to exit */
1690 if (try_to_freeze())
1691 continue;
1692 if (kthread_should_stop())
1693 goto exit;
1694
1695 if (mutex_lock_interruptible(&nodemgr_serialize)) {
1696 if (try_to_freeze())
1697 continue;
1698 goto exit;
1699 }
1700
1701 /* Pause for 1/4 second in 1/16 second intervals,
1702 * to make sure things settle down. */
1703 g = get_hpsb_generation(host);
1704 for (i = 0; i < 4 ; i++) {
1705 if (msleep_interruptible(63) || kthread_should_stop())
1706 goto unlock_exit;
1707
1708 /* Now get the generation in which the node ID's we collect
1709 * are valid. During the bus scan we will use this generation
1710 * for the read transactions, so that if another reset occurs
1711 * during the scan the transactions will fail instead of
1712 * returning bogus data. */
1713 generation = get_hpsb_generation(host);
1714
1715 /* If we get a reset before we are done waiting, then
1716 * start the the waiting over again */
1717 if (generation != g)
1718 g = generation, i = 0;
1719 }
1720
1721 if (!nodemgr_check_irm_capability(host, reset_cycles) ||
1722 !nodemgr_do_irm_duties(host, reset_cycles)) {
1723 reset_cycles++;
1724 mutex_unlock(&nodemgr_serialize);
1725 continue;
1726 }
1727 reset_cycles = 0;
1728
1729 /* Scan our nodes to get the bus options and create node
1730 * entries. This does not do the sysfs stuff, since that
1731 * would trigger uevents and such, which is a bad idea at
1732 * this point. */
1733 nodemgr_node_scan(hi, generation);
1734
1735 /* This actually does the full probe, with sysfs
1736 * registration. */
1737 nodemgr_node_probe(hi, generation);
1738
1739 /* Update some of our sysfs symlinks */
1740 nodemgr_update_host_dev_links(host);
1741
1742 mutex_unlock(&nodemgr_serialize);
1743 }
1744 unlock_exit:
1745 mutex_unlock(&nodemgr_serialize);
1746 exit:
1747 HPSB_VERBOSE("NodeMgr: Exiting thread");
1748 return 0;
1749 }
1750
1751 int nodemgr_for_each_host(void *__data, int (*cb)(struct hpsb_host *, void *))
1752 {
1753 struct class_device *cdev;
1754 struct hpsb_host *host;
1755 int error = 0;
1756
1757 down(&hpsb_host_class.sem);
1758 list_for_each_entry(cdev, &hpsb_host_class.children, node) {
1759 host = container_of(cdev, struct hpsb_host, class_dev);
1760
1761 if ((error = cb(host, __data)))
1762 break;
1763 }
1764 up(&hpsb_host_class.sem);
1765
1766 return error;
1767 }
1768
1769 /* The following four convenience functions use a struct node_entry
1770 * for addressing a node on the bus. They are intended for use by any
1771 * process context, not just the nodemgr thread, so we need to be a
1772 * little careful when reading out the node ID and generation. The
1773 * thing that can go wrong is that we get the node ID, then a bus
1774 * reset occurs, and then we read the generation. The node ID is
1775 * possibly invalid, but the generation is current, and we end up
1776 * sending a packet to a the wrong node.
1777 *
1778 * The solution is to make sure we read the generation first, so that
1779 * if a reset occurs in the process, we end up with a stale generation
1780 * and the transactions will fail instead of silently using wrong node
1781 * ID's.
1782 */
1783
1784 void hpsb_node_fill_packet(struct node_entry *ne, struct hpsb_packet *pkt)
1785 {
1786 pkt->host = ne->host;
1787 pkt->generation = ne->generation;
1788 barrier();
1789 pkt->node_id = ne->nodeid;
1790 }
1791
1792 int hpsb_node_write(struct node_entry *ne, u64 addr,
1793 quadlet_t *buffer, size_t length)
1794 {
1795 unsigned int generation = ne->generation;
1796
1797 barrier();
1798 return hpsb_write(ne->host, ne->nodeid, generation,
1799 addr, buffer, length);
1800 }
1801
1802 static void nodemgr_add_host(struct hpsb_host *host)
1803 {
1804 struct host_info *hi;
1805
1806 hi = hpsb_create_hostinfo(&nodemgr_highlevel, host, sizeof(*hi));
1807 if (!hi) {
1808 HPSB_ERR("NodeMgr: out of memory in add host");
1809 return;
1810 }
1811 hi->host = host;
1812 hi->thread = kthread_run(nodemgr_host_thread, hi, "knodemgrd_%d",
1813 host->id);
1814 if (IS_ERR(hi->thread)) {
1815 HPSB_ERR("NodeMgr: cannot start thread for host %d", host->id);
1816 hpsb_destroy_hostinfo(&nodemgr_highlevel, host);
1817 }
1818 }
1819
1820 static void nodemgr_host_reset(struct hpsb_host *host)
1821 {
1822 struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1823
1824 if (hi) {
1825 HPSB_VERBOSE("NodeMgr: Processing reset for host %d", host->id);
1826 wake_up_process(hi->thread);
1827 }
1828 }
1829
1830 static void nodemgr_remove_host(struct hpsb_host *host)
1831 {
1832 struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1833
1834 if (hi) {
1835 kthread_stop(hi->thread);
1836 nodemgr_remove_host_dev(&host->device);
1837 }
1838 }
1839
1840 static struct hpsb_highlevel nodemgr_highlevel = {
1841 .name = "Node manager",
1842 .add_host = nodemgr_add_host,
1843 .host_reset = nodemgr_host_reset,
1844 .remove_host = nodemgr_remove_host,
1845 };
1846
1847 int init_ieee1394_nodemgr(void)
1848 {
1849 int error;
1850
1851 error = class_register(&nodemgr_ne_class);
1852 if (error)
1853 goto fail_ne;
1854 error = class_register(&nodemgr_ud_class);
1855 if (error)
1856 goto fail_ud;
1857 error = driver_register(&nodemgr_mid_layer_driver);
1858 if (error)
1859 goto fail_ml;
1860 /* This driver is not used if nodemgr is off (disable_nodemgr=1). */
1861 nodemgr_dev_template_host.driver = &nodemgr_mid_layer_driver;
1862
1863 hpsb_register_highlevel(&nodemgr_highlevel);
1864 return 0;
1865
1866 fail_ml:
1867 class_unregister(&nodemgr_ud_class);
1868 fail_ud:
1869 class_unregister(&nodemgr_ne_class);
1870 fail_ne:
1871 return error;
1872 }
1873
1874 void cleanup_ieee1394_nodemgr(void)
1875 {
1876 hpsb_unregister_highlevel(&nodemgr_highlevel);
1877 driver_unregister(&nodemgr_mid_layer_driver);
1878 class_unregister(&nodemgr_ud_class);
1879 class_unregister(&nodemgr_ne_class);
1880 }
Linux with added FPC-III support