drivers/ieee1394/nodemgr.c

   1 /*
   2  * Node information (ConfigROM) collection and management.
   3  *
   4  * Copyright (C) 2000           Andreas E. Bombe
   5  *               2001-2003      Ben Collins <bcollins@debian.net>
   6  *
   7  * This code is licensed under the GPL.  See the file COPYING in the root
   8  * directory of the kernel sources for details.
   9  */
  10
  11 #include <linux/bitmap.h>
  12 #include <linux/kernel.h>
  13 #include <linux/list.h>
  14 #include <linux/slab.h>
  15 #include <linux/delay.h>
  16 #include <linux/kthread.h>
  17 #include <linux/module.h>
  18 #include <linux/moduleparam.h>
  19 #include <linux/mutex.h>
  20 #include <linux/freezer.h>
  21 #include <linux/semaphore.h>
  22 #include <asm/atomic.h>
  23
  24 #include "csr.h"
  25 #include "highlevel.h"
  26 #include "hosts.h"
  27 #include "ieee1394.h"
  28 #include "ieee1394_core.h"
  29 #include "ieee1394_hotplug.h"
  30 #include "ieee1394_types.h"
  31 #include "ieee1394_transactions.h"
  32 #include "nodemgr.h"
  33
  34 static int ignore_drivers;
  35 module_param(ignore_drivers, int, S_IRUGO | S_IWUSR);
  36 MODULE_PARM_DESC(ignore_drivers, "Disable automatic probing for drivers.");
  37
  38 struct nodemgr_csr_info {
  39         struct hpsb_host *host;
  40         nodeid_t nodeid;
  41         unsigned int generation;
  42         unsigned int speed_unverified:1;
  43 };
  44
  45
  46 /*
  47  * Correct the speed map entry.  This is necessary
  48  *  - for nodes with link speed < phy speed,
  49  *  - for 1394b nodes with negotiated phy port speed < IEEE1394_SPEED_MAX.
  50  * A possible speed is determined by trial and error, using quadlet reads.
  51  */
  52 static int nodemgr_check_speed(struct nodemgr_csr_info *ci, u64 addr,
  53                                quadlet_t *buffer)
  54 {
  55         quadlet_t q;
  56         u8 i, *speed, old_speed, good_speed;
  57         int error;
  58
  59         speed = &(ci->host->speed[NODEID_TO_NODE(ci->nodeid)]);
  60         old_speed = *speed;
  61         good_speed = IEEE1394_SPEED_MAX + 1;
  62
  63         /* Try every speed from S100 to old_speed.
  64          * If we did it the other way around, a too low speed could be caught
  65          * if the retry succeeded for some other reason, e.g. because the link
  66          * just finished its initialization. */
  67         for (i = IEEE1394_SPEED_100; i <= old_speed; i++) {
  68                 *speed = i;
  69                 error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
  70                                   &q, sizeof(quadlet_t));
  71                 if (error)
  72                         break;
  73                 *buffer = q;
  74                 good_speed = i;
  75         }
  76         if (good_speed <= IEEE1394_SPEED_MAX) {
  77                 HPSB_DEBUG("Speed probe of node " NODE_BUS_FMT " yields %s",
  78                            NODE_BUS_ARGS(ci->host, ci->nodeid),
  79                            hpsb_speedto_str[good_speed]);
  80                 *speed = good_speed;
  81                 ci->speed_unverified = 0;
  82                 return 0;
  83         }
  84         *speed = old_speed;
  85         return error;
  86 }
  87
  88 static int nodemgr_bus_read(struct csr1212_csr *csr, u64 addr, u16 length,
  89                             void *buffer, void *__ci)
  90 {
  91         struct nodemgr_csr_info *ci = (struct nodemgr_csr_info*)__ci;
  92         int i, error;
  93
  94         for (i = 1; ; i++) {
  95                 error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
  96                                   buffer, length);
  97                 if (!error) {
  98                         ci->speed_unverified = 0;
  99                         break;
 100                 }
 101                 /* Give up after 3rd failure. */
 102                 if (i == 3)
 103                         break;
 104
 105                 /* The ieee1394_core guessed the node's speed capability from
 106                  * the self ID.  Check whether a lower speed works. */
 107                 if (ci->speed_unverified && length == sizeof(quadlet_t)) {
 108                         error = nodemgr_check_speed(ci, addr, buffer);
 109                         if (!error)
 110                                 break;
 111                 }
 112                 if (msleep_interruptible(334))
 113                         return -EINTR;
 114         }
 115         return error;
 116 }
 117
 118 #define OUI_FREECOM_TECHNOLOGIES_GMBH 0x0001db
 119
 120 static int nodemgr_get_max_rom(quadlet_t *bus_info_data, void *__ci)
 121 {
 122         /* Freecom FireWire Hard Drive firmware bug */
 123         if (be32_to_cpu(bus_info_data[3]) >> 8 == OUI_FREECOM_TECHNOLOGIES_GMBH)
 124                 return 0;
 125
 126         return (be32_to_cpu(bus_info_data[2]) >> 8) & 0x3;
 127 }
 128
 129 static struct csr1212_bus_ops nodemgr_csr_ops = {
 130         .bus_read =     nodemgr_bus_read,
 131         .get_max_rom =  nodemgr_get_max_rom
 132 };
 133
 134
 135 /*
 136  * Basically what we do here is start off retrieving the bus_info block.
 137  * From there will fill in some info about the node, verify it is of IEEE
 138  * 1394 type, and that the crc checks out ok. After that we start off with
 139  * the root directory, and subdirectories. To do this, we retrieve the
 140  * quadlet header for a directory, find out the length, and retrieve the
 141  * complete directory entry (be it a leaf or a directory). We then process
 142  * it and add the info to our structure for that particular node.
 143  *
 144  * We verify CRC's along the way for each directory/block/leaf. The entire
 145  * node structure is generic, and simply stores the information in a way
 146  * that's easy to parse by the protocol interface.
 147  */
 148
 149 /*
 150  * The nodemgr relies heavily on the Driver Model for device callbacks and
 151  * driver/device mappings. The old nodemgr used to handle all this itself,
 152  * but now we are much simpler because of the LDM.
 153  */
 154
 155 struct host_info {
 156         struct hpsb_host *host;
 157         struct list_head list;
 158         struct task_struct *thread;
 159 };
 160
 161 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv);
 162 static int nodemgr_uevent(struct device *dev, struct kobj_uevent_env *env);
 163 static void nodemgr_resume_ne(struct node_entry *ne);
 164 static void nodemgr_remove_ne(struct node_entry *ne);
 165 static struct node_entry *find_entry_by_guid(u64 guid);
 166
 167 struct bus_type ieee1394_bus_type = {
 168         .name           = "ieee1394",
 169         .match          = nodemgr_bus_match,
 170 };
 171
 172 static void host_cls_release(struct device *dev)
 173 {
 174         put_device(&container_of((dev), struct hpsb_host, host_dev)->device);
 175 }
 176
 177 struct class hpsb_host_class = {
 178         .name           = "ieee1394_host",
 179         .dev_release    = host_cls_release,
 180 };
 181
 182 static void ne_cls_release(struct device *dev)
 183 {
 184         put_device(&container_of((dev), struct node_entry, node_dev)->device);
 185 }
 186
 187 static struct class nodemgr_ne_class = {
 188         .name           = "ieee1394_node",
 189         .dev_release    = ne_cls_release,
 190 };
 191
 192 static void ud_cls_release(struct device *dev)
 193 {
 194         put_device(&container_of((dev), struct unit_directory, unit_dev)->device);
 195 }
 196
 197 /* The name here is only so that unit directory hotplug works with old
 198  * style hotplug, which only ever did unit directories anyway.
 199  */
 200 static struct class nodemgr_ud_class = {
 201         .name           = "ieee1394",
 202         .dev_release    = ud_cls_release,
 203         .dev_uevent     = nodemgr_uevent,
 204 };
 205
 206 static struct hpsb_highlevel nodemgr_highlevel;
 207
 208
 209 static void nodemgr_release_ud(struct device *dev)
 210 {
 211         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 212
 213         if (ud->vendor_name_kv)
 214                 csr1212_release_keyval(ud->vendor_name_kv);
 215         if (ud->model_name_kv)
 216                 csr1212_release_keyval(ud->model_name_kv);
 217
 218         kfree(ud);
 219 }
 220
 221 static void nodemgr_release_ne(struct device *dev)
 222 {
 223         struct node_entry *ne = container_of(dev, struct node_entry, device);
 224
 225         if (ne->vendor_name_kv)
 226                 csr1212_release_keyval(ne->vendor_name_kv);
 227
 228         kfree(ne);
 229 }
 230
 231
 232 static void nodemgr_release_host(struct device *dev)
 233 {
 234         struct hpsb_host *host = container_of(dev, struct hpsb_host, device);
 235
 236         csr1212_destroy_csr(host->csr.rom);
 237
 238         kfree(host);
 239 }
 240
 241 static int nodemgr_ud_platform_data;
 242
 243 static struct device nodemgr_dev_template_ud = {
 244         .bus            = &ieee1394_bus_type,
 245         .release        = nodemgr_release_ud,
 246         .platform_data  = &nodemgr_ud_platform_data,
 247 };
 248
 249 static struct device nodemgr_dev_template_ne = {
 250         .bus            = &ieee1394_bus_type,
 251         .release        = nodemgr_release_ne,
 252 };
 253
 254 /* This dummy driver prevents the host devices from being scanned. We have no
 255  * useful drivers for them yet, and there would be a deadlock possible if the
 256  * driver core scans the host device while the host's low-level driver (i.e.
 257  * the host's parent device) is being removed. */
 258 static struct device_driver nodemgr_mid_layer_driver = {
 259         .bus            = &ieee1394_bus_type,
 260         .name           = "nodemgr",
 261         .owner          = THIS_MODULE,
 262 };
 263
 264 struct device nodemgr_dev_template_host = {
 265         .bus            = &ieee1394_bus_type,
 266         .release        = nodemgr_release_host,
 267 };
 268
 269
 270 #define fw_attr(class, class_type, field, type, format_string)          \
 271 static ssize_t fw_show_##class##_##field (struct device *dev, struct device_attribute *attr, char *buf)\
 272 {                                                                       \
 273         class_type *class;                                              \
 274         class = container_of(dev, class_type, device);                  \
 275         return sprintf(buf, format_string, (type)class->field);         \
 276 }                                                                       \
 277 static struct device_attribute dev_attr_##class##_##field = {           \
 278         .attr = {.name = __stringify(field), .mode = S_IRUGO },         \
 279         .show   = fw_show_##class##_##field,                            \
 280 };
 281
 282 #define fw_attr_td(class, class_type, td_kv)                            \
 283 static ssize_t fw_show_##class##_##td_kv (struct device *dev, struct device_attribute *attr, char *buf)\
 284 {                                                                       \
 285         int len;                                                        \
 286         class_type *class = container_of(dev, class_type, device);      \
 287         len = (class->td_kv->value.leaf.len - 2) * sizeof(quadlet_t);   \
 288         memcpy(buf,                                                     \
 289                CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(class->td_kv),      \
 290                len);                                                    \
 291         while (buf[len - 1] == '\0')                                    \
 292                 len--;                                                  \
 293         buf[len++] = '\n';                                              \
 294         buf[len] = '\0';                                                \
 295         return len;                                                     \
 296 }                                                                       \
 297 static struct device_attribute dev_attr_##class##_##td_kv = {           \
 298         .attr = {.name = __stringify(td_kv), .mode = S_IRUGO },         \
 299         .show   = fw_show_##class##_##td_kv,                            \
 300 };
 301
 302
 303 #define fw_drv_attr(field, type, format_string)                 \
 304 static ssize_t fw_drv_show_##field (struct device_driver *drv, char *buf) \
 305 {                                                               \
 306         struct hpsb_protocol_driver *driver;                    \
 307         driver = container_of(drv, struct hpsb_protocol_driver, driver); \
 308         return sprintf(buf, format_string, (type)driver->field);\
 309 }                                                               \
 310 static struct driver_attribute driver_attr_drv_##field = {      \
 311         .attr = {.name = __stringify(field), .mode = S_IRUGO }, \
 312         .show   = fw_drv_show_##field,                          \
 313 };
 314
 315
 316 static ssize_t fw_show_ne_bus_options(struct device *dev, struct device_attribute *attr, char *buf)
 317 {
 318         struct node_entry *ne = container_of(dev, struct node_entry, device);
 319
 320         return sprintf(buf, "IRMC(%d) CMC(%d) ISC(%d) BMC(%d) PMC(%d) GEN(%d) "
 321                        "LSPD(%d) MAX_REC(%d) MAX_ROM(%d) CYC_CLK_ACC(%d)\n",
 322                        ne->busopt.irmc,
 323                        ne->busopt.cmc, ne->busopt.isc, ne->busopt.bmc,
 324                        ne->busopt.pmc, ne->busopt.generation, ne->busopt.lnkspd,
 325                        ne->busopt.max_rec,
 326                        ne->busopt.max_rom,
 327                        ne->busopt.cyc_clk_acc);
 328 }
 329 static DEVICE_ATTR(bus_options,S_IRUGO,fw_show_ne_bus_options,NULL);
 330
 331
 332 #ifdef HPSB_DEBUG_TLABELS
 333 static ssize_t fw_show_ne_tlabels_free(struct device *dev,
 334                                        struct device_attribute *attr, char *buf)
 335 {
 336         struct node_entry *ne = container_of(dev, struct node_entry, device);
 337         unsigned long flags;
 338         unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
 339         int tf;
 340
 341         spin_lock_irqsave(&hpsb_tlabel_lock, flags);
 342         tf = 64 - bitmap_weight(tp, 64);
 343         spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
 344
 345         return sprintf(buf, "%d\n", tf);
 346 }
 347 static DEVICE_ATTR(tlabels_free,S_IRUGO,fw_show_ne_tlabels_free,NULL);
 348
 349
 350 static ssize_t fw_show_ne_tlabels_mask(struct device *dev,
 351                                        struct device_attribute *attr, char *buf)
 352 {
 353         struct node_entry *ne = container_of(dev, struct node_entry, device);
 354         unsigned long flags;
 355         unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
 356         u64 tm;
 357
 358         spin_lock_irqsave(&hpsb_tlabel_lock, flags);
 359 #if (BITS_PER_LONG <= 32)
 360         tm = ((u64)tp[0] << 32) + tp[1];
 361 #else
 362         tm = tp[0];
 363 #endif
 364         spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
 365
 366         return sprintf(buf, "0x%016llx\n", (unsigned long long)tm);
 367 }
 368 static DEVICE_ATTR(tlabels_mask, S_IRUGO, fw_show_ne_tlabels_mask, NULL);
 369 #endif /* HPSB_DEBUG_TLABELS */
 370
 371
 372 static ssize_t fw_set_ignore_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 373 {
 374         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 375         int state = simple_strtoul(buf, NULL, 10);
 376
 377         if (state == 1) {
 378                 ud->ignore_driver = 1;
 379                 device_release_driver(dev);
 380         } else if (state == 0)
 381                 ud->ignore_driver = 0;
 382
 383         return count;
 384 }
 385 static ssize_t fw_get_ignore_driver(struct device *dev, struct device_attribute *attr, char *buf)
 386 {
 387         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 388
 389         return sprintf(buf, "%d\n", ud->ignore_driver);
 390 }
 391 static DEVICE_ATTR(ignore_driver, S_IWUSR | S_IRUGO, fw_get_ignore_driver, fw_set_ignore_driver);
 392
 393
 394 static ssize_t fw_set_destroy_node(struct bus_type *bus, const char *buf, size_t count)
 395 {
 396         struct node_entry *ne;
 397         u64 guid = (u64)simple_strtoull(buf, NULL, 16);
 398
 399         ne = find_entry_by_guid(guid);
 400
 401         if (ne == NULL || !ne->in_limbo)
 402                 return -EINVAL;
 403
 404         nodemgr_remove_ne(ne);
 405
 406         return count;
 407 }
 408 static ssize_t fw_get_destroy_node(struct bus_type *bus, char *buf)
 409 {
 410         return sprintf(buf, "You can destroy in_limbo nodes by writing their GUID to this file\n");
 411 }
 412 static BUS_ATTR(destroy_node, S_IWUSR | S_IRUGO, fw_get_destroy_node, fw_set_destroy_node);
 413
 414
 415 static ssize_t fw_set_rescan(struct bus_type *bus, const char *buf,
 416                              size_t count)
 417 {
 418         int error = 0;
 419
 420         if (simple_strtoul(buf, NULL, 10) == 1)
 421                 error = bus_rescan_devices(&ieee1394_bus_type);
 422         return error ? error : count;
 423 }
 424 static ssize_t fw_get_rescan(struct bus_type *bus, char *buf)
 425 {
 426         return sprintf(buf, "You can force a rescan of the bus for "
 427                         "drivers by writing a 1 to this file\n");
 428 }
 429 static BUS_ATTR(rescan, S_IWUSR | S_IRUGO, fw_get_rescan, fw_set_rescan);
 430
 431
 432 static ssize_t fw_set_ignore_drivers(struct bus_type *bus, const char *buf, size_t count)
 433 {
 434         int state = simple_strtoul(buf, NULL, 10);
 435
 436         if (state == 1)
 437                 ignore_drivers = 1;
 438         else if (state == 0)
 439                 ignore_drivers = 0;
 440
 441         return count;
 442 }
 443 static ssize_t fw_get_ignore_drivers(struct bus_type *bus, char *buf)
 444 {
 445         return sprintf(buf, "%d\n", ignore_drivers);
 446 }
 447 static BUS_ATTR(ignore_drivers, S_IWUSR | S_IRUGO, fw_get_ignore_drivers, fw_set_ignore_drivers);
 448
 449
 450 struct bus_attribute *const fw_bus_attrs[] = {
 451         &bus_attr_destroy_node,
 452         &bus_attr_rescan,
 453         &bus_attr_ignore_drivers,
 454         NULL
 455 };
 456
 457
 458 fw_attr(ne, struct node_entry, capabilities, unsigned int, "0x%06x\n")
 459 fw_attr(ne, struct node_entry, nodeid, unsigned int, "0x%04x\n")
 460
 461 fw_attr(ne, struct node_entry, vendor_id, unsigned int, "0x%06x\n")
 462 fw_attr_td(ne, struct node_entry, vendor_name_kv)
 463
 464 fw_attr(ne, struct node_entry, guid, unsigned long long, "0x%016Lx\n")
 465 fw_attr(ne, struct node_entry, guid_vendor_id, unsigned int, "0x%06x\n")
 466 fw_attr(ne, struct node_entry, in_limbo, int, "%d\n");
 467
 468 static struct device_attribute *const fw_ne_attrs[] = {
 469         &dev_attr_ne_guid,
 470         &dev_attr_ne_guid_vendor_id,
 471         &dev_attr_ne_capabilities,
 472         &dev_attr_ne_vendor_id,
 473         &dev_attr_ne_nodeid,
 474         &dev_attr_bus_options,
 475 #ifdef HPSB_DEBUG_TLABELS
 476         &dev_attr_tlabels_free,
 477         &dev_attr_tlabels_mask,
 478 #endif
 479 };
 480
 481
 482
 483 fw_attr(ud, struct unit_directory, address, unsigned long long, "0x%016Lx\n")
 484 fw_attr(ud, struct unit_directory, length, int, "%d\n")
 485 /* These are all dependent on the value being provided */
 486 fw_attr(ud, struct unit_directory, vendor_id, unsigned int, "0x%06x\n")
 487 fw_attr(ud, struct unit_directory, model_id, unsigned int, "0x%06x\n")
 488 fw_attr(ud, struct unit_directory, specifier_id, unsigned int, "0x%06x\n")
 489 fw_attr(ud, struct unit_directory, version, unsigned int, "0x%06x\n")
 490 fw_attr_td(ud, struct unit_directory, vendor_name_kv)
 491 fw_attr_td(ud, struct unit_directory, model_name_kv)
 492
 493 static struct device_attribute *const fw_ud_attrs[] = {
 494         &dev_attr_ud_address,
 495         &dev_attr_ud_length,
 496         &dev_attr_ignore_driver,
 497 };
 498
 499
 500 fw_attr(host, struct hpsb_host, node_count, int, "%d\n")
 501 fw_attr(host, struct hpsb_host, selfid_count, int, "%d\n")
 502 fw_attr(host, struct hpsb_host, nodes_active, int, "%d\n")
 503 fw_attr(host, struct hpsb_host, in_bus_reset, int, "%d\n")
 504 fw_attr(host, struct hpsb_host, is_root, int, "%d\n")
 505 fw_attr(host, struct hpsb_host, is_cycmst, int, "%d\n")
 506 fw_attr(host, struct hpsb_host, is_irm, int, "%d\n")
 507 fw_attr(host, struct hpsb_host, is_busmgr, int, "%d\n")
 508
 509 static struct device_attribute *const fw_host_attrs[] = {
 510         &dev_attr_host_node_count,
 511         &dev_attr_host_selfid_count,
 512         &dev_attr_host_nodes_active,
 513         &dev_attr_host_in_bus_reset,
 514         &dev_attr_host_is_root,
 515         &dev_attr_host_is_cycmst,
 516         &dev_attr_host_is_irm,
 517         &dev_attr_host_is_busmgr,
 518 };
 519
 520
 521 static ssize_t fw_show_drv_device_ids(struct device_driver *drv, char *buf)
 522 {
 523         struct hpsb_protocol_driver *driver;
 524         struct ieee1394_device_id *id;
 525         int length = 0;
 526         char *scratch = buf;
 527
 528         driver = container_of(drv, struct hpsb_protocol_driver, driver);
 529         id = driver->id_table;
 530         if (!id)
 531                 return 0;
 532
 533         for (; id->match_flags != 0; id++) {
 534                 int need_coma = 0;
 535
 536                 if (id->match_flags & IEEE1394_MATCH_VENDOR_ID) {
 537                         length += sprintf(scratch, "vendor_id=0x%06x", id->vendor_id);
 538                         scratch = buf + length;
 539                         need_coma++;
 540                 }
 541
 542                 if (id->match_flags & IEEE1394_MATCH_MODEL_ID) {
 543                         length += sprintf(scratch, "%smodel_id=0x%06x",
 544                                           need_coma++ ? "," : "",
 545                                           id->model_id);
 546                         scratch = buf + length;
 547                 }
 548
 549                 if (id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) {
 550                         length += sprintf(scratch, "%sspecifier_id=0x%06x",
 551                                           need_coma++ ? "," : "",
 552                                           id->specifier_id);
 553                         scratch = buf + length;
 554                 }
 555
 556                 if (id->match_flags & IEEE1394_MATCH_VERSION) {
 557                         length += sprintf(scratch, "%sversion=0x%06x",
 558                                           need_coma++ ? "," : "",
 559                                           id->version);
 560                         scratch = buf + length;
 561                 }
 562
 563                 if (need_coma) {
 564                         *scratch++ = '\n';
 565                         length++;
 566                 }
 567         }
 568
 569         return length;
 570 }
 571 static DRIVER_ATTR(device_ids,S_IRUGO,fw_show_drv_device_ids,NULL);
 572
 573
 574 fw_drv_attr(name, const char *, "%s\n")
 575
 576 static struct driver_attribute *const fw_drv_attrs[] = {
 577         &driver_attr_drv_name,
 578         &driver_attr_device_ids,
 579 };
 580
 581
 582 static void nodemgr_create_drv_files(struct hpsb_protocol_driver *driver)
 583 {
 584         struct device_driver *drv = &driver->driver;
 585         int i;
 586
 587         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
 588                 if (driver_create_file(drv, fw_drv_attrs[i]))
 589                         goto fail;
 590         return;
 591 fail:
 592         HPSB_ERR("Failed to add sysfs attribute");
 593 }
 594
 595
 596 static void nodemgr_remove_drv_files(struct hpsb_protocol_driver *driver)
 597 {
 598         struct device_driver *drv = &driver->driver;
 599         int i;
 600
 601         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
 602                 driver_remove_file(drv, fw_drv_attrs[i]);
 603 }
 604
 605
 606 static void nodemgr_create_ne_dev_files(struct node_entry *ne)
 607 {
 608         struct device *dev = &ne->device;
 609         int i;
 610
 611         for (i = 0; i < ARRAY_SIZE(fw_ne_attrs); i++)
 612                 if (device_create_file(dev, fw_ne_attrs[i]))
 613                         goto fail;
 614         return;
 615 fail:
 616         HPSB_ERR("Failed to add sysfs attribute");
 617 }
 618
 619
 620 static void nodemgr_create_host_dev_files(struct hpsb_host *host)
 621 {
 622         struct device *dev = &host->device;
 623         int i;
 624
 625         for (i = 0; i < ARRAY_SIZE(fw_host_attrs); i++)
 626                 if (device_create_file(dev, fw_host_attrs[i]))
 627                         goto fail;
 628         return;
 629 fail:
 630         HPSB_ERR("Failed to add sysfs attribute");
 631 }
 632
 633
 634 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
 635                                                nodeid_t nodeid);
 636
 637 static void nodemgr_update_host_dev_links(struct hpsb_host *host)
 638 {
 639         struct device *dev = &host->device;
 640         struct node_entry *ne;
 641
 642         sysfs_remove_link(&dev->kobj, "irm_id");
 643         sysfs_remove_link(&dev->kobj, "busmgr_id");
 644         sysfs_remove_link(&dev->kobj, "host_id");
 645
 646         if ((ne = find_entry_by_nodeid(host, host->irm_id)) &&
 647             sysfs_create_link(&dev->kobj, &ne->device.kobj, "irm_id"))
 648                 goto fail;
 649         if ((ne = find_entry_by_nodeid(host, host->busmgr_id)) &&
 650             sysfs_create_link(&dev->kobj, &ne->device.kobj, "busmgr_id"))
 651                 goto fail;
 652         if ((ne = find_entry_by_nodeid(host, host->node_id)) &&
 653             sysfs_create_link(&dev->kobj, &ne->device.kobj, "host_id"))
 654                 goto fail;
 655         return;
 656 fail:
 657         HPSB_ERR("Failed to update sysfs attributes for host %d", host->id);
 658 }
 659
 660 static void nodemgr_create_ud_dev_files(struct unit_directory *ud)
 661 {
 662         struct device *dev = &ud->device;
 663         int i;
 664
 665         for (i = 0; i < ARRAY_SIZE(fw_ud_attrs); i++)
 666                 if (device_create_file(dev, fw_ud_attrs[i]))
 667                         goto fail;
 668         if (ud->flags & UNIT_DIRECTORY_SPECIFIER_ID)
 669                 if (device_create_file(dev, &dev_attr_ud_specifier_id))
 670                         goto fail;
 671         if (ud->flags & UNIT_DIRECTORY_VERSION)
 672                 if (device_create_file(dev, &dev_attr_ud_version))
 673                         goto fail;
 674         if (ud->flags & UNIT_DIRECTORY_VENDOR_ID) {
 675                 if (device_create_file(dev, &dev_attr_ud_vendor_id))
 676                         goto fail;
 677                 if (ud->vendor_name_kv &&
 678                     device_create_file(dev, &dev_attr_ud_vendor_name_kv))
 679                         goto fail;
 680         }
 681         if (ud->flags & UNIT_DIRECTORY_MODEL_ID) {
 682                 if (device_create_file(dev, &dev_attr_ud_model_id))
 683                         goto fail;
 684                 if (ud->model_name_kv &&
 685                     device_create_file(dev, &dev_attr_ud_model_name_kv))
 686                         goto fail;
 687         }
 688         return;
 689 fail:
 690         HPSB_ERR("Failed to add sysfs attribute");
 691 }
 692
 693
 694 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv)
 695 {
 696         struct hpsb_protocol_driver *driver;
 697         struct unit_directory *ud;
 698         struct ieee1394_device_id *id;
 699
 700         /* We only match unit directories */
 701         if (dev->platform_data != &nodemgr_ud_platform_data)
 702                 return 0;
 703
 704         ud = container_of(dev, struct unit_directory, device);
 705         if (ud->ne->in_limbo || ud->ignore_driver)
 706                 return 0;
 707
 708         /* We only match drivers of type hpsb_protocol_driver */
 709         if (drv == &nodemgr_mid_layer_driver)
 710                 return 0;
 711
 712         driver = container_of(drv, struct hpsb_protocol_driver, driver);
 713         id = driver->id_table;
 714         if (!id)
 715                 return 0;
 716
 717         for (; id->match_flags != 0; id++) {
 718                 if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) &&
 719                     id->vendor_id != ud->vendor_id)
 720                         continue;
 721
 722                 if ((id->match_flags & IEEE1394_MATCH_MODEL_ID) &&
 723                     id->model_id != ud->model_id)
 724                         continue;
 725
 726                 if ((id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) &&
 727                     id->specifier_id != ud->specifier_id)
 728                         continue;
 729
 730                 if ((id->match_flags & IEEE1394_MATCH_VERSION) &&
 731                     id->version != ud->version)
 732                         continue;
 733
 734                 return 1;
 735         }
 736
 737         return 0;
 738 }
 739
 740
 741 static DEFINE_MUTEX(nodemgr_serialize_remove_uds);
 742
 743 static int __match_ne(struct device *dev, void *data)
 744 {
 745         struct unit_directory *ud;
 746         struct node_entry *ne = (struct node_entry *)data;
 747
 748         ud = container_of(dev, struct unit_directory, unit_dev);
 749         return ud->ne == ne;
 750 }
 751
 752 static void nodemgr_remove_uds(struct node_entry *ne)
 753 {
 754         struct device *dev;
 755         struct unit_directory *ud;
 756
 757         /* Use class_find device to iterate the devices. Since this code
 758          * may be called from other contexts besides the knodemgrds,
 759          * protect it by nodemgr_serialize_remove_uds.
 760          */
 761         mutex_lock(&nodemgr_serialize_remove_uds);
 762         for (;;) {
 763                 dev = class_find_device(&nodemgr_ud_class, NULL, ne,
 764                                         __match_ne);
 765                 if (!dev)
 766                         break;
 767                 ud = container_of(dev, struct unit_directory, unit_dev);
 768                 put_device(dev);
 769                 device_unregister(&ud->unit_dev);
 770                 device_unregister(&ud->device);
 771         }
 772         mutex_unlock(&nodemgr_serialize_remove_uds);
 773 }
 774
 775
 776 static void nodemgr_remove_ne(struct node_entry *ne)
 777 {
 778         struct device *dev;
 779
 780         dev = get_device(&ne->device);
 781         if (!dev)
 782                 return;
 783
 784         HPSB_DEBUG("Node removed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 785                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
 786         nodemgr_remove_uds(ne);
 787
 788         device_unregister(&ne->node_dev);
 789         device_unregister(dev);
 790
 791         put_device(dev);
 792 }
 793
 794 static int __nodemgr_remove_host_dev(struct device *dev, void *data)
 795 {
 796         if (dev->bus == &ieee1394_bus_type)
 797                 nodemgr_remove_ne(container_of(dev, struct node_entry,
 798                                   device));
 799         return 0;
 800 }
 801
 802 static void nodemgr_remove_host_dev(struct device *dev)
 803 {
 804         WARN_ON(device_for_each_child(dev, NULL, __nodemgr_remove_host_dev));
 805         sysfs_remove_link(&dev->kobj, "irm_id");
 806         sysfs_remove_link(&dev->kobj, "busmgr_id");
 807         sysfs_remove_link(&dev->kobj, "host_id");
 808 }
 809
 810
 811 static void nodemgr_update_bus_options(struct node_entry *ne)
 812 {
 813 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
 814         static const u16 mr[] = { 4, 64, 1024, 0};
 815 #endif
 816         quadlet_t busoptions = be32_to_cpu(ne->csr->bus_info_data[2]);
 817
 818         ne->busopt.irmc         = (busoptions >> 31) & 1;
 819         ne->busopt.cmc          = (busoptions >> 30) & 1;
 820         ne->busopt.isc          = (busoptions >> 29) & 1;
 821         ne->busopt.bmc          = (busoptions >> 28) & 1;
 822         ne->busopt.pmc          = (busoptions >> 27) & 1;
 823         ne->busopt.cyc_clk_acc  = (busoptions >> 16) & 0xff;
 824         ne->busopt.max_rec      = 1 << (((busoptions >> 12) & 0xf) + 1);
 825         ne->busopt.max_rom      = (busoptions >> 8) & 0x3;
 826         ne->busopt.generation   = (busoptions >> 4) & 0xf;
 827         ne->busopt.lnkspd       = busoptions & 0x7;
 828
 829         HPSB_VERBOSE("NodeMgr: raw=0x%08x irmc=%d cmc=%d isc=%d bmc=%d pmc=%d "
 830                      "cyc_clk_acc=%d max_rec=%d max_rom=%d gen=%d lspd=%d",
 831                      busoptions, ne->busopt.irmc, ne->busopt.cmc,
 832                      ne->busopt.isc, ne->busopt.bmc, ne->busopt.pmc,
 833                      ne->busopt.cyc_clk_acc, ne->busopt.max_rec,
 834                      mr[ne->busopt.max_rom],
 835                      ne->busopt.generation, ne->busopt.lnkspd);
 836 }
 837
 838
 839 static struct node_entry *nodemgr_create_node(octlet_t guid, struct csr1212_csr *csr,
 840                                               struct host_info *hi, nodeid_t nodeid,
 841                                               unsigned int generation)
 842 {
 843         struct hpsb_host *host = hi->host;
 844         struct node_entry *ne;
 845
 846         ne = kzalloc(sizeof(*ne), GFP_KERNEL);
 847         if (!ne)
 848                 goto fail_alloc;
 849
 850         ne->host = host;
 851         ne->nodeid = nodeid;
 852         ne->generation = generation;
 853         ne->needs_probe = true;
 854
 855         ne->guid = guid;
 856         ne->guid_vendor_id = (guid >> 40) & 0xffffff;
 857         ne->csr = csr;
 858
 859         memcpy(&ne->device, &nodemgr_dev_template_ne,
 860                sizeof(ne->device));
 861         ne->device.parent = &host->device;
 862         snprintf(ne->device.bus_id, BUS_ID_SIZE, "%016Lx",
 863                  (unsigned long long)(ne->guid));
 864
 865         ne->node_dev.parent = &ne->device;
 866         ne->node_dev.class = &nodemgr_ne_class;
 867         snprintf(ne->node_dev.bus_id, BUS_ID_SIZE, "%016Lx",
 868                 (unsigned long long)(ne->guid));
 869
 870         if (device_register(&ne->device))
 871                 goto fail_devreg;
 872         if (device_register(&ne->node_dev))
 873                 goto fail_classdevreg;
 874         get_device(&ne->device);
 875
 876         nodemgr_create_ne_dev_files(ne);
 877
 878         nodemgr_update_bus_options(ne);
 879
 880         HPSB_DEBUG("%s added: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 881                    (host->node_id == nodeid) ? "Host" : "Node",
 882                    NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
 883
 884         return ne;
 885
 886 fail_classdevreg:
 887         device_unregister(&ne->device);
 888 fail_devreg:
 889         kfree(ne);
 890 fail_alloc:
 891         HPSB_ERR("Failed to create node ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 892                  NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
 893
 894         return NULL;
 895 }
 896
 897 static int __match_ne_guid(struct device *dev, void *data)
 898 {
 899         struct node_entry *ne;
 900         u64 *guid = (u64 *)data;
 901
 902         ne = container_of(dev, struct node_entry, node_dev);
 903         return ne->guid == *guid;
 904 }
 905
 906 static struct node_entry *find_entry_by_guid(u64 guid)
 907 {
 908         struct device *dev;
 909         struct node_entry *ne;
 910
 911         dev = class_find_device(&nodemgr_ne_class, NULL, &guid,
 912                                 __match_ne_guid);
 913         if (!dev)
 914                 return NULL;
 915         ne = container_of(dev, struct node_entry, node_dev);
 916         put_device(dev);
 917
 918         return ne;
 919 }
 920
 921 struct match_nodeid_param {
 922         struct hpsb_host *host;
 923         nodeid_t nodeid;
 924 };
 925
 926 static int __match_ne_nodeid(struct device *dev, void *data)
 927 {
 928         int found = 0;
 929         struct node_entry *ne;
 930         struct match_nodeid_param *param = (struct match_nodeid_param *)data;
 931
 932         if (!dev)
 933                 goto ret;
 934         ne = container_of(dev, struct node_entry, node_dev);
 935         if (ne->host == param->host && ne->nodeid == param->nodeid)
 936                 found = 1;
 937 ret:
 938         return found;
 939 }
 940
 941 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
 942                                                nodeid_t nodeid)
 943 {
 944         struct device *dev;
 945         struct node_entry *ne;
 946         struct match_nodeid_param param;
 947
 948         param.host = host;
 949         param.nodeid = nodeid;
 950
 951         dev = class_find_device(&nodemgr_ne_class, NULL, &param,
 952                                 __match_ne_nodeid);
 953         if (!dev)
 954                 return NULL;
 955         ne = container_of(dev, struct node_entry, node_dev);
 956         put_device(dev);
 957
 958         return ne;
 959 }
 960
 961
 962 static void nodemgr_register_device(struct node_entry *ne,
 963         struct unit_directory *ud, struct device *parent)
 964 {
 965         memcpy(&ud->device, &nodemgr_dev_template_ud,
 966                sizeof(ud->device));
 967
 968         ud->device.parent = parent;
 969
 970         snprintf(ud->device.bus_id, BUS_ID_SIZE, "%s-%u",
 971                  ne->device.bus_id, ud->id);
 972
 973         ud->unit_dev.parent = &ud->device;
 974         ud->unit_dev.class = &nodemgr_ud_class;
 975         snprintf(ud->unit_dev.bus_id, BUS_ID_SIZE, "%s-%u",
 976                  ne->device.bus_id, ud->id);
 977
 978         if (device_register(&ud->device))
 979                 goto fail_devreg;
 980         if (device_register(&ud->unit_dev))
 981                 goto fail_classdevreg;
 982         get_device(&ud->device);
 983
 984         nodemgr_create_ud_dev_files(ud);
 985
 986         return;
 987
 988 fail_classdevreg:
 989         device_unregister(&ud->device);
 990 fail_devreg:
 991         HPSB_ERR("Failed to create unit %s", ud->device.bus_id);
 992 }
 993
 994
 995 /* This implementation currently only scans the config rom and its
 996  * immediate unit directories looking for software_id and
 997  * software_version entries, in order to get driver autoloading working. */
 998 static struct unit_directory *nodemgr_process_unit_directory
 999         (struct host_info *hi, struct node_entry *ne, struct csr1212_keyval *ud_kv,
1000          unsigned int *id, struct unit_directory *parent)
1001 {
1002         struct unit_directory *ud;
1003         struct unit_directory *ud_child = NULL;
1004         struct csr1212_dentry *dentry;
1005         struct csr1212_keyval *kv;
1006         u8 last_key_id = 0;
1007
1008         ud = kzalloc(sizeof(*ud), GFP_KERNEL);
1009         if (!ud)
1010                 goto unit_directory_error;
1011
1012         ud->ne = ne;
1013         ud->ignore_driver = ignore_drivers;
1014         ud->address = ud_kv->offset + CSR1212_REGISTER_SPACE_BASE;
1015         ud->directory_id = ud->address & 0xffffff;
1016         ud->ud_kv = ud_kv;
1017         ud->id = (*id)++;
1018
1019         csr1212_for_each_dir_entry(ne->csr, kv, ud_kv, dentry) {
1020                 switch (kv->key.id) {
1021                 case CSR1212_KV_ID_VENDOR:
1022                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
1023                                 ud->vendor_id = kv->value.immediate;
1024                                 ud->flags |= UNIT_DIRECTORY_VENDOR_ID;
1025                         }
1026                         break;
1027
1028                 case CSR1212_KV_ID_MODEL:
1029                         ud->model_id = kv->value.immediate;
1030                         ud->flags |= UNIT_DIRECTORY_MODEL_ID;
1031                         break;
1032
1033                 case CSR1212_KV_ID_SPECIFIER_ID:
1034                         ud->specifier_id = kv->value.immediate;
1035                         ud->flags |= UNIT_DIRECTORY_SPECIFIER_ID;
1036                         break;
1037
1038                 case CSR1212_KV_ID_VERSION:
1039                         ud->version = kv->value.immediate;
1040                         ud->flags |= UNIT_DIRECTORY_VERSION;
1041                         break;
1042
1043                 case CSR1212_KV_ID_DESCRIPTOR:
1044                         if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1045                             CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1046                             CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1047                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1048                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1049                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1050                                 switch (last_key_id) {
1051                                 case CSR1212_KV_ID_VENDOR:
1052                                         csr1212_keep_keyval(kv);
1053                                         ud->vendor_name_kv = kv;
1054                                         break;
1055
1056                                 case CSR1212_KV_ID_MODEL:
1057                                         csr1212_keep_keyval(kv);
1058                                         ud->model_name_kv = kv;
1059                                         break;
1060
1061                                 }
1062                         } /* else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) ... */
1063                         break;
1064
1065                 case CSR1212_KV_ID_DEPENDENT_INFO:
1066                         /* Logical Unit Number */
1067                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
1068                                 if (ud->flags & UNIT_DIRECTORY_HAS_LUN) {
1069                                         ud_child = kmemdup(ud, sizeof(*ud_child), GFP_KERNEL);
1070                                         if (!ud_child)
1071                                                 goto unit_directory_error;
1072                                         nodemgr_register_device(ne, ud_child, &ne->device);
1073                                         ud_child = NULL;
1074
1075                                         ud->id = (*id)++;
1076                                 }
1077                                 ud->lun = kv->value.immediate;
1078                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN;
1079
1080                         /* Logical Unit Directory */
1081                         } else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) {
1082                                 /* This should really be done in SBP2 as this is
1083                                  * doing SBP2 specific parsing.
1084                                  */
1085
1086                                 /* first register the parent unit */
1087                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN_DIRECTORY;
1088                                 if (ud->device.bus != &ieee1394_bus_type)
1089                                         nodemgr_register_device(ne, ud, &ne->device);
1090
1091                                 /* process the child unit */
1092                                 ud_child = nodemgr_process_unit_directory(hi, ne, kv, id, ud);
1093
1094                                 if (ud_child == NULL)
1095                                         break;
1096
1097                                 /* inherit unspecified values, the driver core picks it up */
1098                                 if ((ud->flags & UNIT_DIRECTORY_MODEL_ID) &&
1099                                     !(ud_child->flags & UNIT_DIRECTORY_MODEL_ID))
1100                                 {
1101                                         ud_child->flags |=  UNIT_DIRECTORY_MODEL_ID;
1102                                         ud_child->model_id = ud->model_id;
1103                                 }
1104                                 if ((ud->flags & UNIT_DIRECTORY_SPECIFIER_ID) &&
1105                                     !(ud_child->flags & UNIT_DIRECTORY_SPECIFIER_ID))
1106                                 {
1107                                         ud_child->flags |=  UNIT_DIRECTORY_SPECIFIER_ID;
1108                                         ud_child->specifier_id = ud->specifier_id;
1109                                 }
1110                                 if ((ud->flags & UNIT_DIRECTORY_VERSION) &&
1111                                     !(ud_child->flags & UNIT_DIRECTORY_VERSION))
1112                                 {
1113                                         ud_child->flags |=  UNIT_DIRECTORY_VERSION;
1114                                         ud_child->version = ud->version;
1115                                 }
1116
1117                                 /* register the child unit */
1118                                 ud_child->flags |= UNIT_DIRECTORY_LUN_DIRECTORY;
1119                                 nodemgr_register_device(ne, ud_child, &ud->device);
1120                         }
1121
1122                         break;
1123
1124                 case CSR1212_KV_ID_DIRECTORY_ID:
1125                         ud->directory_id = kv->value.immediate;
1126                         break;
1127
1128                 default:
1129                         break;
1130                 }
1131                 last_key_id = kv->key.id;
1132         }
1133
1134         /* do not process child units here and only if not already registered */
1135         if (!parent && ud->device.bus != &ieee1394_bus_type)
1136                 nodemgr_register_device(ne, ud, &ne->device);
1137
1138         return ud;
1139
1140 unit_directory_error:
1141         kfree(ud);
1142         return NULL;
1143 }
1144
1145
1146 static void nodemgr_process_root_directory(struct host_info *hi, struct node_entry *ne)
1147 {
1148         unsigned int ud_id = 0;
1149         struct csr1212_dentry *dentry;
1150         struct csr1212_keyval *kv, *vendor_name_kv = NULL;
1151         u8 last_key_id = 0;
1152
1153         ne->needs_probe = false;
1154
1155         csr1212_for_each_dir_entry(ne->csr, kv, ne->csr->root_kv, dentry) {
1156                 switch (kv->key.id) {
1157                 case CSR1212_KV_ID_VENDOR:
1158                         ne->vendor_id = kv->value.immediate;
1159                         break;
1160
1161                 case CSR1212_KV_ID_NODE_CAPABILITIES:
1162                         ne->capabilities = kv->value.immediate;
1163                         break;
1164
1165                 case CSR1212_KV_ID_UNIT:
1166                         nodemgr_process_unit_directory(hi, ne, kv, &ud_id, NULL);
1167                         break;
1168
1169                 case CSR1212_KV_ID_DESCRIPTOR:
1170                         if (last_key_id == CSR1212_KV_ID_VENDOR) {
1171                                 if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1172                                     CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1173                                     CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1174                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1175                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1176                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1177                                         csr1212_keep_keyval(kv);
1178                                         vendor_name_kv = kv;
1179                                 }
1180                         }
1181                         break;
1182                 }
1183                 last_key_id = kv->key.id;
1184         }
1185
1186         if (ne->vendor_name_kv) {
1187                 kv = ne->vendor_name_kv;
1188                 ne->vendor_name_kv = vendor_name_kv;
1189                 csr1212_release_keyval(kv);
1190         } else if (vendor_name_kv) {
1191                 ne->vendor_name_kv = vendor_name_kv;
1192                 if (device_create_file(&ne->device,
1193                                        &dev_attr_ne_vendor_name_kv) != 0)
1194                         HPSB_ERR("Failed to add sysfs attribute");
1195         }
1196 }
1197
1198 #ifdef CONFIG_HOTPLUG
1199
1200 static int nodemgr_uevent(struct device *dev, struct kobj_uevent_env *env)
1201 {
1202         struct unit_directory *ud;
1203         int retval = 0;
1204         /* ieee1394:venNmoNspNverN */
1205         char buf[8 + 1 + 3 + 8 + 2 + 8 + 2 + 8 + 3 + 8 + 1];
1206
1207         if (!dev)
1208                 return -ENODEV;
1209
1210         ud = container_of(dev, struct unit_directory, unit_dev);
1211
1212         if (ud->ne->in_limbo || ud->ignore_driver)
1213                 return -ENODEV;
1214
1215 #define PUT_ENVP(fmt,val)                                       \
1216 do {                                                            \
1217         retval = add_uevent_var(env, fmt, val);         \
1218         if (retval)                                             \
1219                 return retval;                                  \
1220 } while (0)
1221
1222         PUT_ENVP("VENDOR_ID=%06x", ud->vendor_id);
1223         PUT_ENVP("MODEL_ID=%06x", ud->model_id);
1224         PUT_ENVP("GUID=%016Lx", (unsigned long long)ud->ne->guid);
1225         PUT_ENVP("SPECIFIER_ID=%06x", ud->specifier_id);
1226         PUT_ENVP("VERSION=%06x", ud->version);
1227         snprintf(buf, sizeof(buf), "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
1228                         ud->vendor_id,
1229                         ud->model_id,
1230                         ud->specifier_id,
1231                         ud->version);
1232         PUT_ENVP("MODALIAS=%s", buf);
1233
1234 #undef PUT_ENVP
1235
1236         return 0;
1237 }
1238
1239 #else
1240
1241 static int nodemgr_uevent(struct device *dev, struct kobj_uevent_env *env)
1242 {
1243         return -ENODEV;
1244 }
1245
1246 #endif /* CONFIG_HOTPLUG */
1247
1248
1249 int __hpsb_register_protocol(struct hpsb_protocol_driver *drv,
1250                              struct module *owner)
1251 {
1252         int error;
1253
1254         drv->driver.bus = &ieee1394_bus_type;
1255         drv->driver.owner = owner;
1256         drv->driver.name = drv->name;
1257
1258         /* This will cause a probe for devices */
1259         error = driver_register(&drv->driver);
1260         if (!error)
1261                 nodemgr_create_drv_files(drv);
1262         return error;
1263 }
1264
1265 void hpsb_unregister_protocol(struct hpsb_protocol_driver *driver)
1266 {
1267         nodemgr_remove_drv_files(driver);
1268         /* This will subsequently disconnect all devices that our driver
1269          * is attached to. */
1270         driver_unregister(&driver->driver);
1271 }
1272
1273
1274 /*
1275  * This function updates nodes that were present on the bus before the
1276  * reset and still are after the reset.  The nodeid and the config rom
1277  * may have changed, and the drivers managing this device must be
1278  * informed that this device just went through a bus reset, to allow
1279  * the to take whatever actions required.
1280  */
1281 static void nodemgr_update_node(struct node_entry *ne, struct csr1212_csr *csr,
1282                                 struct host_info *hi, nodeid_t nodeid,
1283                                 unsigned int generation)
1284 {
1285         if (ne->nodeid != nodeid) {
1286                 HPSB_DEBUG("Node changed: " NODE_BUS_FMT " -> " NODE_BUS_FMT,
1287                            NODE_BUS_ARGS(ne->host, ne->nodeid),
1288                            NODE_BUS_ARGS(ne->host, nodeid));
1289                 ne->nodeid = nodeid;
1290         }
1291
1292         if (ne->busopt.generation != ((be32_to_cpu(csr->bus_info_data[2]) >> 4) & 0xf)) {
1293                 kfree(ne->csr->private);
1294                 csr1212_destroy_csr(ne->csr);
1295                 ne->csr = csr;
1296
1297                 /* If the node's configrom generation has changed, we
1298                  * unregister all the unit directories. */
1299                 nodemgr_remove_uds(ne);
1300
1301                 nodemgr_update_bus_options(ne);
1302
1303                 /* Mark the node as new, so it gets re-probed */
1304                 ne->needs_probe = true;
1305         } else {
1306                 /* old cache is valid, so update its generation */
1307                 struct nodemgr_csr_info *ci = ne->csr->private;
1308                 ci->generation = generation;
1309                 /* free the partially filled now unneeded new cache */
1310                 kfree(csr->private);
1311                 csr1212_destroy_csr(csr);
1312         }
1313
1314         if (ne->in_limbo)
1315                 nodemgr_resume_ne(ne);
1316
1317         /* Mark the node current */
1318         ne->generation = generation;
1319 }
1320
1321
1322
1323 static void nodemgr_node_scan_one(struct host_info *hi,
1324                                   nodeid_t nodeid, int generation)
1325 {
1326         struct hpsb_host *host = hi->host;
1327         struct node_entry *ne;
1328         octlet_t guid;
1329         struct csr1212_csr *csr;
1330         struct nodemgr_csr_info *ci;
1331         u8 *speed;
1332
1333         ci = kmalloc(sizeof(*ci), GFP_KERNEL);
1334         if (!ci)
1335                 return;
1336
1337         ci->host = host;
1338         ci->nodeid = nodeid;
1339         ci->generation = generation;
1340
1341         /* Prepare for speed probe which occurs when reading the ROM */
1342         speed = &(host->speed[NODEID_TO_NODE(nodeid)]);
1343         if (*speed > host->csr.lnk_spd)
1344                 *speed = host->csr.lnk_spd;
1345         ci->speed_unverified = *speed > IEEE1394_SPEED_100;
1346
1347         /* We need to detect when the ConfigROM's generation has changed,
1348          * so we only update the node's info when it needs to be.  */
1349
1350         csr = csr1212_create_csr(&nodemgr_csr_ops, 5 * sizeof(quadlet_t), ci);
1351         if (!csr || csr1212_parse_csr(csr) != CSR1212_SUCCESS) {
1352                 HPSB_ERR("Error parsing configrom for node " NODE_BUS_FMT,
1353                          NODE_BUS_ARGS(host, nodeid));
1354                 if (csr)
1355                         csr1212_destroy_csr(csr);
1356                 kfree(ci);
1357                 return;
1358         }
1359
1360         if (csr->bus_info_data[1] != IEEE1394_BUSID_MAGIC) {
1361                 /* This isn't a 1394 device, but we let it slide. There
1362                  * was a report of a device with broken firmware which
1363                  * reported '2394' instead of '1394', which is obviously a
1364                  * mistake. One would hope that a non-1394 device never
1365                  * gets connected to Firewire bus. If someone does, we
1366                  * shouldn't be held responsible, so we'll allow it with a
1367                  * warning.  */
1368                 HPSB_WARN("Node " NODE_BUS_FMT " has invalid busID magic [0x%08x]",
1369                           NODE_BUS_ARGS(host, nodeid), csr->bus_info_data[1]);
1370         }
1371
1372         guid = ((u64)be32_to_cpu(csr->bus_info_data[3]) << 32) | be32_to_cpu(csr->bus_info_data[4]);
1373         ne = find_entry_by_guid(guid);
1374
1375         if (ne && ne->host != host && ne->in_limbo) {
1376                 /* Must have moved this device from one host to another */
1377                 nodemgr_remove_ne(ne);
1378                 ne = NULL;
1379         }
1380
1381         if (!ne)
1382                 nodemgr_create_node(guid, csr, hi, nodeid, generation);
1383         else
1384                 nodemgr_update_node(ne, csr, hi, nodeid, generation);
1385 }
1386
1387
1388 static void nodemgr_node_scan(struct host_info *hi, int generation)
1389 {
1390         int count;
1391         struct hpsb_host *host = hi->host;
1392         struct selfid *sid = (struct selfid *)host->topology_map;
1393         nodeid_t nodeid = LOCAL_BUS;
1394
1395         /* Scan each node on the bus */
1396         for (count = host->selfid_count; count; count--, sid++) {
1397                 if (sid->extended)
1398                         continue;
1399
1400                 if (!sid->link_active) {
1401                         nodeid++;
1402                         continue;
1403                 }
1404                 nodemgr_node_scan_one(hi, nodeid++, generation);
1405         }
1406 }
1407
1408 static int __nodemgr_driver_suspend(struct device *dev, void *data)
1409 {
1410         struct unit_directory *ud;
1411         struct device_driver *drv;
1412         struct node_entry *ne = (struct node_entry *)data;
1413         int error;
1414
1415         ud = container_of(dev, struct unit_directory, unit_dev);
1416         if (ud->ne == ne) {
1417                 drv = get_driver(ud->device.driver);
1418                 if (drv) {
1419                         error = 1; /* release if suspend is not implemented */
1420                         if (drv->suspend) {
1421                                 down(&ud->device.sem);
1422                                 error = drv->suspend(&ud->device, PMSG_SUSPEND);
1423                                 up(&ud->device.sem);
1424                         }
1425                         if (error)
1426                                 device_release_driver(&ud->device);
1427                         put_driver(drv);
1428                 }
1429         }
1430
1431         return 0;
1432 }
1433
1434 static int __nodemgr_driver_resume(struct device *dev, void *data)
1435 {
1436         struct unit_directory *ud;
1437         struct device_driver *drv;
1438         struct node_entry *ne = (struct node_entry *)data;
1439
1440         ud = container_of(dev, struct unit_directory, unit_dev);
1441         if (ud->ne == ne) {
1442                 drv = get_driver(ud->device.driver);
1443                 if (drv) {
1444                         if (drv->resume) {
1445                                 down(&ud->device.sem);
1446                                 drv->resume(&ud->device);
1447                                 up(&ud->device.sem);
1448                         }
1449                         put_driver(drv);
1450                 }
1451         }
1452
1453         return 0;
1454 }
1455
1456 static void nodemgr_suspend_ne(struct node_entry *ne)
1457 {
1458         HPSB_DEBUG("Node suspended: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1459                    NODE_BUS_ARGS(ne->host, ne->nodeid),
1460                    (unsigned long long)ne->guid);
1461
1462         ne->in_limbo = 1;
1463         WARN_ON(device_create_file(&ne->device, &dev_attr_ne_in_limbo));
1464
1465         class_for_each_device(&nodemgr_ud_class, NULL, ne,
1466                               __nodemgr_driver_suspend);
1467 }
1468
1469
1470 static void nodemgr_resume_ne(struct node_entry *ne)
1471 {
1472         ne->in_limbo = 0;
1473         device_remove_file(&ne->device, &dev_attr_ne_in_limbo);
1474
1475         class_for_each_device(&nodemgr_ud_class, NULL, ne,
1476                               __nodemgr_driver_resume);
1477         HPSB_DEBUG("Node resumed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1478                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1479 }
1480
1481 static int __nodemgr_update_pdrv(struct device *dev, void *data)
1482 {
1483         struct unit_directory *ud;
1484         struct device_driver *drv;
1485         struct hpsb_protocol_driver *pdrv;
1486         struct node_entry *ne = (struct node_entry *)data;
1487         int error;
1488
1489         ud = container_of(dev, struct unit_directory, unit_dev);
1490         if (ud->ne == ne) {
1491                 drv = get_driver(ud->device.driver);
1492                 if (drv) {
1493                         error = 0;
1494                         pdrv = container_of(drv, struct hpsb_protocol_driver,
1495                                             driver);
1496                         if (pdrv->update) {
1497                                 down(&ud->device.sem);
1498                                 error = pdrv->update(ud);
1499                                 up(&ud->device.sem);
1500                         }
1501                         if (error)
1502                                 device_release_driver(&ud->device);
1503                         put_driver(drv);
1504                 }
1505         }
1506
1507         return 0;
1508 }
1509
1510 static void nodemgr_update_pdrv(struct node_entry *ne)
1511 {
1512         class_for_each_device(&nodemgr_ud_class, NULL, ne,
1513                               __nodemgr_update_pdrv);
1514 }
1515
1516
1517 /* Write the BROADCAST_CHANNEL as per IEEE1394a 8.3.2.3.11 and 8.4.2.3.  This
1518  * seems like an optional service but in the end it is practically mandatory
1519  * as a consequence of these clauses.
1520  *
1521  * Note that we cannot do a broadcast write to all nodes at once because some
1522  * pre-1394a devices would hang. */
1523 static void nodemgr_irm_write_bc(struct node_entry *ne, int generation)
1524 {
1525         const u64 bc_addr = (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL);
1526         quadlet_t bc_remote, bc_local;
1527         int error;
1528
1529         if (!ne->host->is_irm || ne->generation != generation ||
1530             ne->nodeid == ne->host->node_id)
1531                 return;
1532
1533         bc_local = cpu_to_be32(ne->host->csr.broadcast_channel);
1534
1535         /* Check if the register is implemented and 1394a compliant. */
1536         error = hpsb_read(ne->host, ne->nodeid, generation, bc_addr, &bc_remote,
1537                           sizeof(bc_remote));
1538         if (!error && bc_remote & cpu_to_be32(0x80000000) &&
1539             bc_remote != bc_local)
1540                 hpsb_node_write(ne, bc_addr, &bc_local, sizeof(bc_local));
1541 }
1542
1543
1544 static void nodemgr_probe_ne(struct host_info *hi, struct node_entry *ne, int generation)
1545 {
1546         struct device *dev;
1547
1548         if (ne->host != hi->host || ne->in_limbo)
1549                 return;
1550
1551         dev = get_device(&ne->device);
1552         if (!dev)
1553                 return;
1554
1555         nodemgr_irm_write_bc(ne, generation);
1556
1557         /* If "needs_probe", then this is either a new or changed node we
1558          * rescan totally. If the generation matches for an existing node
1559          * (one that existed prior to the bus reset) we send update calls
1560          * down to the drivers. Otherwise, this is a dead node and we
1561          * suspend it. */
1562         if (ne->needs_probe)
1563                 nodemgr_process_root_directory(hi, ne);
1564         else if (ne->generation == generation)
1565                 nodemgr_update_pdrv(ne);
1566         else
1567                 nodemgr_suspend_ne(ne);
1568
1569         put_device(dev);
1570 }
1571
1572 struct probe_param {
1573         struct host_info *hi;
1574         int generation;
1575         bool probe_now;
1576 };
1577
1578 static int node_probe(struct device *dev, void *data)
1579 {
1580         struct probe_param *p = data;
1581         struct node_entry *ne;
1582
1583         if (p->generation != get_hpsb_generation(p->hi->host))
1584                 return -EAGAIN;
1585
1586         ne = container_of(dev, struct node_entry, node_dev);
1587         if (ne->needs_probe == p->probe_now)
1588                 nodemgr_probe_ne(p->hi, ne, p->generation);
1589         return 0;
1590 }
1591
1592 static void nodemgr_node_probe(struct host_info *hi, int generation)
1593 {
1594         struct probe_param p;
1595
1596         p.hi = hi;
1597         p.generation = generation;
1598         /*
1599          * Do some processing of the nodes we've probed. This pulls them
1600          * into the sysfs layer if needed, and can result in processing of
1601          * unit-directories, or just updating the node and it's
1602          * unit-directories.
1603          *
1604          * Run updates before probes. Usually, updates are time-critical
1605          * while probes are time-consuming.
1606          *
1607          * Meanwhile, another bus reset may have happened. In this case we
1608          * skip everything here and let the next bus scan handle it.
1609          * Otherwise we may prematurely remove nodes which are still there.
1610          */
1611         p.probe_now = false;
1612         if (class_for_each_device(&nodemgr_ne_class, NULL, &p, node_probe) != 0)
1613                 return;
1614
1615         p.probe_now = true;
1616         if (class_for_each_device(&nodemgr_ne_class, NULL, &p, node_probe) != 0)
1617                 return;
1618         /*
1619          * Now let's tell the bus to rescan our devices. This may seem
1620          * like overhead, but the driver-model core will only scan a
1621          * device for a driver when either the device is added, or when a
1622          * new driver is added. A bus reset is a good reason to rescan
1623          * devices that were there before.  For example, an sbp2 device
1624          * may become available for login, if the host that held it was
1625          * just removed.
1626          */
1627         if (bus_rescan_devices(&ieee1394_bus_type) != 0)
1628                 HPSB_DEBUG("bus_rescan_devices had an error");
1629 }
1630
1631 static int nodemgr_send_resume_packet(struct hpsb_host *host)
1632 {
1633         struct hpsb_packet *packet;
1634         int error = -ENOMEM;
1635
1636         packet = hpsb_make_phypacket(host,
1637                         EXTPHYPACKET_TYPE_RESUME |
1638                         NODEID_TO_NODE(host->node_id) << PHYPACKET_PORT_SHIFT);
1639         if (packet) {
1640                 packet->no_waiter = 1;
1641                 packet->generation = get_hpsb_generation(host);
1642                 error = hpsb_send_packet(packet);
1643         }
1644         if (error)
1645                 HPSB_WARN("fw-host%d: Failed to broadcast resume packet",
1646                           host->id);
1647         return error;
1648 }
1649
1650 /* Perform a few high-level IRM responsibilities. */
1651 static int nodemgr_do_irm_duties(struct hpsb_host *host, int cycles)
1652 {
1653         quadlet_t bc;
1654
1655         /* if irm_id == -1 then there is no IRM on this bus */
1656         if (!host->is_irm || host->irm_id == (nodeid_t)-1)
1657                 return 1;
1658
1659         /* We are a 1394a-2000 compliant IRM. Set the validity bit. */
1660         host->csr.broadcast_channel |= 0x40000000;
1661
1662         /* If there is no bus manager then we should set the root node's
1663          * force_root bit to promote bus stability per the 1394
1664          * spec. (8.4.2.6) */
1665         if (host->busmgr_id == 0xffff && host->node_count > 1)
1666         {
1667                 u16 root_node = host->node_count - 1;
1668
1669                 /* get cycle master capability flag from root node */
1670                 if (host->is_cycmst ||
1671                     (!hpsb_read(host, LOCAL_BUS | root_node, get_hpsb_generation(host),
1672                                 (CSR_REGISTER_BASE + CSR_CONFIG_ROM + 2 * sizeof(quadlet_t)),
1673                                 &bc, sizeof(quadlet_t)) &&
1674                      be32_to_cpu(bc) & 1 << CSR_CMC_SHIFT))
1675                         hpsb_send_phy_config(host, root_node, -1);
1676                 else {
1677                         HPSB_DEBUG("The root node is not cycle master capable; "
1678                                    "selecting a new root node and resetting...");
1679
1680                         if (cycles >= 5) {
1681                                 /* Oh screw it! Just leave the bus as it is */
1682                                 HPSB_DEBUG("Stopping reset loop for IRM sanity");
1683                                 return 1;
1684                         }
1685
1686                         hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1687                         hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1688
1689                         return 0;
1690                 }
1691         }
1692
1693         /* Some devices suspend their ports while being connected to an inactive
1694          * host adapter, i.e. if connected before the low-level driver is
1695          * loaded.  They become visible either when physically unplugged and
1696          * replugged, or when receiving a resume packet.  Send one once. */
1697         if (!host->resume_packet_sent && !nodemgr_send_resume_packet(host))
1698                 host->resume_packet_sent = 1;
1699
1700         return 1;
1701 }
1702
1703 /* We need to ensure that if we are not the IRM, that the IRM node is capable of
1704  * everything we can do, otherwise issue a bus reset and try to become the IRM
1705  * ourselves. */
1706 static int nodemgr_check_irm_capability(struct hpsb_host *host, int cycles)
1707 {
1708         quadlet_t bc;
1709         int status;
1710
1711         if (hpsb_disable_irm || host->is_irm)
1712                 return 1;
1713
1714         status = hpsb_read(host, LOCAL_BUS | (host->irm_id),
1715                            get_hpsb_generation(host),
1716                            (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL),
1717                            &bc, sizeof(quadlet_t));
1718
1719         if (status < 0 || !(be32_to_cpu(bc) & 0x80000000)) {
1720                 /* The current irm node does not have a valid BROADCAST_CHANNEL
1721                  * register and we do, so reset the bus with force_root set */
1722                 HPSB_DEBUG("Current remote IRM is not 1394a-2000 compliant, resetting...");
1723
1724                 if (cycles >= 5) {
1725                         /* Oh screw it! Just leave the bus as it is */
1726                         HPSB_DEBUG("Stopping reset loop for IRM sanity");
1727                         return 1;
1728                 }
1729
1730                 hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1731                 hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1732
1733                 return 0;
1734         }
1735
1736         return 1;
1737 }
1738
1739 static int nodemgr_host_thread(void *__hi)
1740 {
1741         struct host_info *hi = (struct host_info *)__hi;
1742         struct hpsb_host *host = hi->host;
1743         unsigned int g, generation = 0;
1744         int i, reset_cycles = 0;
1745
1746         set_freezable();
1747         /* Setup our device-model entries */
1748         nodemgr_create_host_dev_files(host);
1749
1750         for (;;) {
1751                 /* Sleep until next bus reset */
1752                 set_current_state(TASK_INTERRUPTIBLE);
1753                 if (get_hpsb_generation(host) == generation &&
1754                     !kthread_should_stop())
1755                         schedule();
1756                 __set_current_state(TASK_RUNNING);
1757
1758                 /* Thread may have been woken up to freeze or to exit */
1759                 if (try_to_freeze())
1760                         continue;
1761                 if (kthread_should_stop())
1762                         goto exit;
1763
1764                 /* Pause for 1/4 second in 1/16 second intervals,
1765                  * to make sure things settle down. */
1766                 g = get_hpsb_generation(host);
1767                 for (i = 0; i < 4 ; i++) {
1768                         msleep_interruptible(63);
1769                         if (kthread_should_stop())
1770                                 goto exit;
1771
1772                         /* Now get the generation in which the node ID's we collect
1773                          * are valid.  During the bus scan we will use this generation
1774                          * for the read transactions, so that if another reset occurs
1775                          * during the scan the transactions will fail instead of
1776                          * returning bogus data. */
1777                         generation = get_hpsb_generation(host);
1778
1779                         /* If we get a reset before we are done waiting, then
1780                          * start the waiting over again */
1781                         if (generation != g)
1782                                 g = generation, i = 0;
1783                 }
1784
1785                 if (!nodemgr_check_irm_capability(host, reset_cycles) ||
1786                     !nodemgr_do_irm_duties(host, reset_cycles)) {
1787                         reset_cycles++;
1788                         continue;
1789                 }
1790                 reset_cycles = 0;
1791
1792                 /* Scan our nodes to get the bus options and create node
1793                  * entries. This does not do the sysfs stuff, since that
1794                  * would trigger uevents and such, which is a bad idea at
1795                  * this point. */
1796                 nodemgr_node_scan(hi, generation);
1797
1798                 /* This actually does the full probe, with sysfs
1799                  * registration. */
1800                 nodemgr_node_probe(hi, generation);
1801
1802                 /* Update some of our sysfs symlinks */
1803                 nodemgr_update_host_dev_links(host);
1804         }
1805 exit:
1806         HPSB_VERBOSE("NodeMgr: Exiting thread");
1807         return 0;
1808 }
1809
1810 struct host_iter_param {
1811         void *data;
1812         int (*cb)(struct hpsb_host *, void *);
1813 };
1814
1815 static int __nodemgr_for_each_host(struct device *dev, void *data)
1816 {
1817         struct hpsb_host *host;
1818         struct host_iter_param *hip = (struct host_iter_param *)data;
1819         int error = 0;
1820
1821         host = container_of(dev, struct hpsb_host, host_dev);
1822         error = hip->cb(host, hip->data);
1823
1824         return error;
1825 }
1826 /**
1827  * nodemgr_for_each_host - call a function for each IEEE 1394 host
1828  * @data: an address to supply to the callback
1829  * @cb: function to call for each host
1830  *
1831  * Iterate the hosts, calling a given function with supplied data for each host.
1832  * If the callback fails on a host, i.e. if it returns a non-zero value, the
1833  * iteration is stopped.
1834  *
1835  * Return value: 0 on success, non-zero on failure (same as returned by last run
1836  * of the callback).
1837  */
1838 int nodemgr_for_each_host(void *data, int (*cb)(struct hpsb_host *, void *))
1839 {
1840         struct host_iter_param hip;
1841         int error;
1842
1843         hip.cb = cb;
1844         hip.data = data;
1845         error = class_for_each_device(&hpsb_host_class, NULL, &hip,
1846                                       __nodemgr_for_each_host);
1847
1848         return error;
1849 }
1850
1851 /* The following two convenience functions use a struct node_entry
1852  * for addressing a node on the bus.  They are intended for use by any
1853  * process context, not just the nodemgr thread, so we need to be a
1854  * little careful when reading out the node ID and generation.  The
1855  * thing that can go wrong is that we get the node ID, then a bus
1856  * reset occurs, and then we read the generation.  The node ID is
1857  * possibly invalid, but the generation is current, and we end up
1858  * sending a packet to a the wrong node.
1859  *
1860  * The solution is to make sure we read the generation first, so that
1861  * if a reset occurs in the process, we end up with a stale generation
1862  * and the transactions will fail instead of silently using wrong node
1863  * ID's.
1864  */
1865
1866 /**
1867  * hpsb_node_fill_packet - fill some destination information into a packet
1868  * @ne: destination node
1869  * @packet: packet to fill in
1870  *
1871  * This will fill in the given, pre-initialised hpsb_packet with the current
1872  * information from the node entry (host, node ID, bus generation number).
1873  */
1874 void hpsb_node_fill_packet(struct node_entry *ne, struct hpsb_packet *packet)
1875 {
1876         packet->host = ne->host;
1877         packet->generation = ne->generation;
1878         barrier();
1879         packet->node_id = ne->nodeid;
1880 }
1881
1882 int hpsb_node_write(struct node_entry *ne, u64 addr,
1883                     quadlet_t *buffer, size_t length)
1884 {
1885         unsigned int generation = ne->generation;
1886
1887         barrier();
1888         return hpsb_write(ne->host, ne->nodeid, generation,
1889                           addr, buffer, length);
1890 }
1891
1892 static void nodemgr_add_host(struct hpsb_host *host)
1893 {
1894         struct host_info *hi;
1895
1896         hi = hpsb_create_hostinfo(&nodemgr_highlevel, host, sizeof(*hi));
1897         if (!hi) {
1898                 HPSB_ERR("NodeMgr: out of memory in add host");
1899                 return;
1900         }
1901         hi->host = host;
1902         hi->thread = kthread_run(nodemgr_host_thread, hi, "knodemgrd_%d",
1903                                  host->id);
1904         if (IS_ERR(hi->thread)) {
1905                 HPSB_ERR("NodeMgr: cannot start thread for host %d", host->id);
1906                 hpsb_destroy_hostinfo(&nodemgr_highlevel, host);
1907         }
1908 }
1909
1910 static void nodemgr_host_reset(struct hpsb_host *host)
1911 {
1912         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1913
1914         if (hi) {
1915                 HPSB_VERBOSE("NodeMgr: Processing reset for host %d", host->id);
1916                 wake_up_process(hi->thread);
1917         }
1918 }
1919
1920 static void nodemgr_remove_host(struct hpsb_host *host)
1921 {
1922         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1923
1924         if (hi) {
1925                 kthread_stop(hi->thread);
1926                 nodemgr_remove_host_dev(&host->device);
1927         }
1928 }
1929
1930 static struct hpsb_highlevel nodemgr_highlevel = {
1931         .name =         "Node manager",
1932         .add_host =     nodemgr_add_host,
1933         .host_reset =   nodemgr_host_reset,
1934         .remove_host =  nodemgr_remove_host,
1935 };
1936
1937 int init_ieee1394_nodemgr(void)
1938 {
1939         int error;
1940
1941         error = class_register(&nodemgr_ne_class);
1942         if (error)
1943                 goto fail_ne;
1944         error = class_register(&nodemgr_ud_class);
1945         if (error)
1946                 goto fail_ud;
1947         error = driver_register(&nodemgr_mid_layer_driver);
1948         if (error)
1949                 goto fail_ml;
1950         /* This driver is not used if nodemgr is off (disable_nodemgr=1). */
1951         nodemgr_dev_template_host.driver = &nodemgr_mid_layer_driver;
1952
1953         hpsb_register_highlevel(&nodemgr_highlevel);
1954         return 0;
1955
1956 fail_ml:
1957         class_unregister(&nodemgr_ud_class);
1958 fail_ud:
1959         class_unregister(&nodemgr_ne_class);
1960 fail_ne:
1961         return error;
1962 }
1963
1964 void cleanup_ieee1394_nodemgr(void)
1965 {
1966         hpsb_unregister_highlevel(&nodemgr_highlevel);
1967         driver_unregister(&nodemgr_mid_layer_driver);
1968         class_unregister(&nodemgr_ud_class);
1969         class_unregister(&nodemgr_ne_class);
1970 }