git.oblomov.eu Git - linux-2.6/blob - 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, 4);
  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,
  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, 4);
  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) {
 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 static struct csr1212_bus_ops nodemgr_csr_ops = {
 119         .bus_read =     nodemgr_bus_read,
 120 };
 121
 122
 123 /*
 124  * Basically what we do here is start off retrieving the bus_info block.
 125  * From there will fill in some info about the node, verify it is of IEEE
 126  * 1394 type, and that the crc checks out ok. After that we start off with
 127  * the root directory, and subdirectories. To do this, we retrieve the
 128  * quadlet header for a directory, find out the length, and retrieve the
 129  * complete directory entry (be it a leaf or a directory). We then process
 130  * it and add the info to our structure for that particular node.
 131  *
 132  * We verify CRC's along the way for each directory/block/leaf. The entire
 133  * node structure is generic, and simply stores the information in a way
 134  * that's easy to parse by the protocol interface.
 135  */
 136
 137 /*
 138  * The nodemgr relies heavily on the Driver Model for device callbacks and
 139  * driver/device mappings. The old nodemgr used to handle all this itself,
 140  * but now we are much simpler because of the LDM.
 141  */
 142
 143 struct host_info {
 144         struct hpsb_host *host;
 145         struct list_head list;
 146         struct task_struct *thread;
 147 };
 148
 149 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv);
 150 static int nodemgr_uevent(struct device *dev, struct kobj_uevent_env *env);
 151
 152 struct bus_type ieee1394_bus_type = {
 153         .name           = "ieee1394",
 154         .match          = nodemgr_bus_match,
 155 };
 156
 157 static void host_cls_release(struct device *dev)
 158 {
 159         put_device(&container_of((dev), struct hpsb_host, host_dev)->device);
 160 }
 161
 162 struct class hpsb_host_class = {
 163         .name           = "ieee1394_host",
 164         .dev_release    = host_cls_release,
 165 };
 166
 167 static void ne_cls_release(struct device *dev)
 168 {
 169         put_device(&container_of((dev), struct node_entry, node_dev)->device);
 170 }
 171
 172 static struct class nodemgr_ne_class = {
 173         .name           = "ieee1394_node",
 174         .dev_release    = ne_cls_release,
 175 };
 176
 177 static void ud_cls_release(struct device *dev)
 178 {
 179         put_device(&container_of((dev), struct unit_directory, unit_dev)->device);
 180 }
 181
 182 /* The name here is only so that unit directory hotplug works with old
 183  * style hotplug, which only ever did unit directories anyway.
 184  */
 185 static struct class nodemgr_ud_class = {
 186         .name           = "ieee1394",
 187         .dev_release    = ud_cls_release,
 188         .dev_uevent     = nodemgr_uevent,
 189 };
 190
 191 static struct hpsb_highlevel nodemgr_highlevel;
 192
 193
 194 static void nodemgr_release_ud(struct device *dev)
 195 {
 196         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 197
 198         if (ud->vendor_name_kv)
 199                 csr1212_release_keyval(ud->vendor_name_kv);
 200         if (ud->model_name_kv)
 201                 csr1212_release_keyval(ud->model_name_kv);
 202
 203         kfree(ud);
 204 }
 205
 206 static void nodemgr_release_ne(struct device *dev)
 207 {
 208         struct node_entry *ne = container_of(dev, struct node_entry, device);
 209
 210         if (ne->vendor_name_kv)
 211                 csr1212_release_keyval(ne->vendor_name_kv);
 212
 213         kfree(ne);
 214 }
 215
 216
 217 static void nodemgr_release_host(struct device *dev)
 218 {
 219         struct hpsb_host *host = container_of(dev, struct hpsb_host, device);
 220
 221         csr1212_destroy_csr(host->csr.rom);
 222
 223         kfree(host);
 224 }
 225
 226 static int nodemgr_ud_platform_data;
 227
 228 static struct device nodemgr_dev_template_ud = {
 229         .bus            = &ieee1394_bus_type,
 230         .release        = nodemgr_release_ud,
 231         .platform_data  = &nodemgr_ud_platform_data,
 232 };
 233
 234 static struct device nodemgr_dev_template_ne = {
 235         .bus            = &ieee1394_bus_type,
 236         .release        = nodemgr_release_ne,
 237 };
 238
 239 /* This dummy driver prevents the host devices from being scanned. We have no
 240  * useful drivers for them yet, and there would be a deadlock possible if the
 241  * driver core scans the host device while the host's low-level driver (i.e.
 242  * the host's parent device) is being removed. */
 243 static struct device_driver nodemgr_mid_layer_driver = {
 244         .bus            = &ieee1394_bus_type,
 245         .name           = "nodemgr",
 246         .owner          = THIS_MODULE,
 247 };
 248
 249 struct device nodemgr_dev_template_host = {
 250         .bus            = &ieee1394_bus_type,
 251         .release        = nodemgr_release_host,
 252 };
 253
 254
 255 #define fw_attr(class, class_type, field, type, format_string)          \
 256 static ssize_t fw_show_##class##_##field (struct device *dev, struct device_attribute *attr, char *buf)\
 257 {                                                                       \
 258         class_type *class;                                              \
 259         class = container_of(dev, class_type, device);                  \
 260         return sprintf(buf, format_string, (type)class->field);         \
 261 }                                                                       \
 262 static struct device_attribute dev_attr_##class##_##field = {           \
 263         .attr = {.name = __stringify(field), .mode = S_IRUGO },         \
 264         .show   = fw_show_##class##_##field,                            \
 265 };
 266
 267 #define fw_attr_td(class, class_type, td_kv)                            \
 268 static ssize_t fw_show_##class##_##td_kv (struct device *dev, struct device_attribute *attr, char *buf)\
 269 {                                                                       \
 270         int len;                                                        \
 271         class_type *class = container_of(dev, class_type, device);      \
 272         len = (class->td_kv->value.leaf.len - 2) * sizeof(quadlet_t);   \
 273         memcpy(buf,                                                     \
 274                CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(class->td_kv),      \
 275                len);                                                    \
 276         while (buf[len - 1] == '\0')                                    \
 277                 len--;                                                  \
 278         buf[len++] = '\n';                                              \
 279         buf[len] = '\0';                                                \
 280         return len;                                                     \
 281 }                                                                       \
 282 static struct device_attribute dev_attr_##class##_##td_kv = {           \
 283         .attr = {.name = __stringify(td_kv), .mode = S_IRUGO },         \
 284         .show   = fw_show_##class##_##td_kv,                            \
 285 };
 286
 287
 288 #define fw_drv_attr(field, type, format_string)                 \
 289 static ssize_t fw_drv_show_##field (struct device_driver *drv, char *buf) \
 290 {                                                               \
 291         struct hpsb_protocol_driver *driver;                    \
 292         driver = container_of(drv, struct hpsb_protocol_driver, driver); \
 293         return sprintf(buf, format_string, (type)driver->field);\
 294 }                                                               \
 295 static struct driver_attribute driver_attr_drv_##field = {      \
 296         .attr = {.name = __stringify(field), .mode = S_IRUGO }, \
 297         .show   = fw_drv_show_##field,                          \
 298 };
 299
 300
 301 static ssize_t fw_show_ne_bus_options(struct device *dev, struct device_attribute *attr, char *buf)
 302 {
 303         struct node_entry *ne = container_of(dev, struct node_entry, device);
 304
 305         return sprintf(buf, "IRMC(%d) CMC(%d) ISC(%d) BMC(%d) PMC(%d) GEN(%d) "
 306                        "LSPD(%d) MAX_REC(%d) MAX_ROM(%d) CYC_CLK_ACC(%d)\n",
 307                        ne->busopt.irmc,
 308                        ne->busopt.cmc, ne->busopt.isc, ne->busopt.bmc,
 309                        ne->busopt.pmc, ne->busopt.generation, ne->busopt.lnkspd,
 310                        ne->busopt.max_rec,
 311                        ne->busopt.max_rom,
 312                        ne->busopt.cyc_clk_acc);
 313 }
 314 static DEVICE_ATTR(bus_options,S_IRUGO,fw_show_ne_bus_options,NULL);
 315
 316
 317 #ifdef HPSB_DEBUG_TLABELS
 318 static ssize_t fw_show_ne_tlabels_free(struct device *dev,
 319                                        struct device_attribute *attr, char *buf)
 320 {
 321         struct node_entry *ne = container_of(dev, struct node_entry, device);
 322         unsigned long flags;
 323         unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
 324         int tf;
 325
 326         spin_lock_irqsave(&hpsb_tlabel_lock, flags);
 327         tf = 64 - bitmap_weight(tp, 64);
 328         spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
 329
 330         return sprintf(buf, "%d\n", tf);
 331 }
 332 static DEVICE_ATTR(tlabels_free,S_IRUGO,fw_show_ne_tlabels_free,NULL);
 333
 334
 335 static ssize_t fw_show_ne_tlabels_mask(struct device *dev,
 336                                        struct device_attribute *attr, char *buf)
 337 {
 338         struct node_entry *ne = container_of(dev, struct node_entry, device);
 339         unsigned long flags;
 340         unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
 341         u64 tm;
 342
 343         spin_lock_irqsave(&hpsb_tlabel_lock, flags);
 344 #if (BITS_PER_LONG <= 32)
 345         tm = ((u64)tp[0] << 32) + tp[1];
 346 #else
 347         tm = tp[0];
 348 #endif
 349         spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
 350
 351         return sprintf(buf, "0x%016llx\n", (unsigned long long)tm);
 352 }
 353 static DEVICE_ATTR(tlabels_mask, S_IRUGO, fw_show_ne_tlabels_mask, NULL);
 354 #endif /* HPSB_DEBUG_TLABELS */
 355
 356
 357 static ssize_t fw_set_ignore_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 358 {
 359         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 360         int state = simple_strtoul(buf, NULL, 10);
 361
 362         if (state == 1) {
 363                 ud->ignore_driver = 1;
 364                 device_release_driver(dev);
 365         } else if (state == 0)
 366                 ud->ignore_driver = 0;
 367
 368         return count;
 369 }
 370 static ssize_t fw_get_ignore_driver(struct device *dev, struct device_attribute *attr, char *buf)
 371 {
 372         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 373
 374         return sprintf(buf, "%d\n", ud->ignore_driver);
 375 }
 376 static DEVICE_ATTR(ignore_driver, S_IWUSR | S_IRUGO, fw_get_ignore_driver, fw_set_ignore_driver);
 377
 378
 379 static ssize_t fw_set_rescan(struct bus_type *bus, const char *buf,
 380                              size_t count)
 381 {
 382         int error = 0;
 383
 384         if (simple_strtoul(buf, NULL, 10) == 1)
 385                 error = bus_rescan_devices(&ieee1394_bus_type);
 386         return error ? error : count;
 387 }
 388 static ssize_t fw_get_rescan(struct bus_type *bus, char *buf)
 389 {
 390         return sprintf(buf, "You can force a rescan of the bus for "
 391                         "drivers by writing a 1 to this file\n");
 392 }
 393 static BUS_ATTR(rescan, S_IWUSR | S_IRUGO, fw_get_rescan, fw_set_rescan);
 394
 395
 396 static ssize_t fw_set_ignore_drivers(struct bus_type *bus, const char *buf, size_t count)
 397 {
 398         int state = simple_strtoul(buf, NULL, 10);
 399
 400         if (state == 1)
 401                 ignore_drivers = 1;
 402         else if (state == 0)
 403                 ignore_drivers = 0;
 404
 405         return count;
 406 }
 407 static ssize_t fw_get_ignore_drivers(struct bus_type *bus, char *buf)
 408 {
 409         return sprintf(buf, "%d\n", ignore_drivers);
 410 }
 411 static BUS_ATTR(ignore_drivers, S_IWUSR | S_IRUGO, fw_get_ignore_drivers, fw_set_ignore_drivers);
 412
 413
 414 struct bus_attribute *const fw_bus_attrs[] = {
 415         &bus_attr_rescan,
 416         &bus_attr_ignore_drivers,
 417         NULL
 418 };
 419
 420
 421 fw_attr(ne, struct node_entry, capabilities, unsigned int, "0x%06x\n")
 422 fw_attr(ne, struct node_entry, nodeid, unsigned int, "0x%04x\n")
 423
 424 fw_attr(ne, struct node_entry, vendor_id, unsigned int, "0x%06x\n")
 425 fw_attr_td(ne, struct node_entry, vendor_name_kv)
 426
 427 fw_attr(ne, struct node_entry, guid, unsigned long long, "0x%016Lx\n")
 428 fw_attr(ne, struct node_entry, guid_vendor_id, unsigned int, "0x%06x\n")
 429 fw_attr(ne, struct node_entry, in_limbo, int, "%d\n");
 430
 431 static struct device_attribute *const fw_ne_attrs[] = {
 432         &dev_attr_ne_guid,
 433         &dev_attr_ne_guid_vendor_id,
 434         &dev_attr_ne_capabilities,
 435         &dev_attr_ne_vendor_id,
 436         &dev_attr_ne_nodeid,
 437         &dev_attr_bus_options,
 438 #ifdef HPSB_DEBUG_TLABELS
 439         &dev_attr_tlabels_free,
 440         &dev_attr_tlabels_mask,
 441 #endif
 442 };
 443
 444
 445
 446 fw_attr(ud, struct unit_directory, address, unsigned long long, "0x%016Lx\n")
 447 fw_attr(ud, struct unit_directory, length, int, "%d\n")
 448 /* These are all dependent on the value being provided */
 449 fw_attr(ud, struct unit_directory, vendor_id, unsigned int, "0x%06x\n")
 450 fw_attr(ud, struct unit_directory, model_id, unsigned int, "0x%06x\n")
 451 fw_attr(ud, struct unit_directory, specifier_id, unsigned int, "0x%06x\n")
 452 fw_attr(ud, struct unit_directory, version, unsigned int, "0x%06x\n")
 453 fw_attr_td(ud, struct unit_directory, vendor_name_kv)
 454 fw_attr_td(ud, struct unit_directory, model_name_kv)
 455
 456 static struct device_attribute *const fw_ud_attrs[] = {
 457         &dev_attr_ud_address,
 458         &dev_attr_ud_length,
 459         &dev_attr_ignore_driver,
 460 };
 461
 462
 463 fw_attr(host, struct hpsb_host, node_count, int, "%d\n")
 464 fw_attr(host, struct hpsb_host, selfid_count, int, "%d\n")
 465 fw_attr(host, struct hpsb_host, nodes_active, int, "%d\n")
 466 fw_attr(host, struct hpsb_host, in_bus_reset, int, "%d\n")
 467 fw_attr(host, struct hpsb_host, is_root, int, "%d\n")
 468 fw_attr(host, struct hpsb_host, is_cycmst, int, "%d\n")
 469 fw_attr(host, struct hpsb_host, is_irm, int, "%d\n")
 470 fw_attr(host, struct hpsb_host, is_busmgr, int, "%d\n")
 471
 472 static struct device_attribute *const fw_host_attrs[] = {
 473         &dev_attr_host_node_count,
 474         &dev_attr_host_selfid_count,
 475         &dev_attr_host_nodes_active,
 476         &dev_attr_host_in_bus_reset,
 477         &dev_attr_host_is_root,
 478         &dev_attr_host_is_cycmst,
 479         &dev_attr_host_is_irm,
 480         &dev_attr_host_is_busmgr,
 481 };
 482
 483
 484 static ssize_t fw_show_drv_device_ids(struct device_driver *drv, char *buf)
 485 {
 486         struct hpsb_protocol_driver *driver;
 487         const struct ieee1394_device_id *id;
 488         int length = 0;
 489         char *scratch = buf;
 490
 491         driver = container_of(drv, struct hpsb_protocol_driver, driver);
 492         id = driver->id_table;
 493         if (!id)
 494                 return 0;
 495
 496         for (; id->match_flags != 0; id++) {
 497                 int need_coma = 0;
 498
 499                 if (id->match_flags & IEEE1394_MATCH_VENDOR_ID) {
 500                         length += sprintf(scratch, "vendor_id=0x%06x", id->vendor_id);
 501                         scratch = buf + length;
 502                         need_coma++;
 503                 }
 504
 505                 if (id->match_flags & IEEE1394_MATCH_MODEL_ID) {
 506                         length += sprintf(scratch, "%smodel_id=0x%06x",
 507                                           need_coma++ ? "," : "",
 508                                           id->model_id);
 509                         scratch = buf + length;
 510                 }
 511
 512                 if (id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) {
 513                         length += sprintf(scratch, "%sspecifier_id=0x%06x",
 514                                           need_coma++ ? "," : "",
 515                                           id->specifier_id);
 516                         scratch = buf + length;
 517                 }
 518
 519                 if (id->match_flags & IEEE1394_MATCH_VERSION) {
 520                         length += sprintf(scratch, "%sversion=0x%06x",
 521                                           need_coma++ ? "," : "",
 522                                           id->version);
 523                         scratch = buf + length;
 524                 }
 525
 526                 if (need_coma) {
 527                         *scratch++ = '\n';
 528                         length++;
 529                 }
 530         }
 531
 532         return length;
 533 }
 534 static DRIVER_ATTR(device_ids,S_IRUGO,fw_show_drv_device_ids,NULL);
 535
 536
 537 fw_drv_attr(name, const char *, "%s\n")
 538
 539 static struct driver_attribute *const fw_drv_attrs[] = {
 540         &driver_attr_drv_name,
 541         &driver_attr_device_ids,
 542 };
 543
 544
 545 static void nodemgr_create_drv_files(struct hpsb_protocol_driver *driver)
 546 {
 547         struct device_driver *drv = &driver->driver;
 548         int i;
 549
 550         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
 551                 if (driver_create_file(drv, fw_drv_attrs[i]))
 552                         goto fail;
 553         return;
 554 fail:
 555         HPSB_ERR("Failed to add sysfs attribute");
 556 }
 557
 558
 559 static void nodemgr_remove_drv_files(struct hpsb_protocol_driver *driver)
 560 {
 561         struct device_driver *drv = &driver->driver;
 562         int i;
 563
 564         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
 565                 driver_remove_file(drv, fw_drv_attrs[i]);
 566 }
 567
 568
 569 static void nodemgr_create_ne_dev_files(struct node_entry *ne)
 570 {
 571         struct device *dev = &ne->device;
 572         int i;
 573
 574         for (i = 0; i < ARRAY_SIZE(fw_ne_attrs); i++)
 575                 if (device_create_file(dev, fw_ne_attrs[i]))
 576                         goto fail;
 577         return;
 578 fail:
 579         HPSB_ERR("Failed to add sysfs attribute");
 580 }
 581
 582
 583 static void nodemgr_create_host_dev_files(struct hpsb_host *host)
 584 {
 585         struct device *dev = &host->device;
 586         int i;
 587
 588         for (i = 0; i < ARRAY_SIZE(fw_host_attrs); i++)
 589                 if (device_create_file(dev, fw_host_attrs[i]))
 590                         goto fail;
 591         return;
 592 fail:
 593         HPSB_ERR("Failed to add sysfs attribute");
 594 }
 595
 596
 597 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
 598                                                nodeid_t nodeid);
 599
 600 static void nodemgr_update_host_dev_links(struct hpsb_host *host)
 601 {
 602         struct device *dev = &host->device;
 603         struct node_entry *ne;
 604
 605         sysfs_remove_link(&dev->kobj, "irm_id");
 606         sysfs_remove_link(&dev->kobj, "busmgr_id");
 607         sysfs_remove_link(&dev->kobj, "host_id");
 608
 609         if ((ne = find_entry_by_nodeid(host, host->irm_id)) &&
 610             sysfs_create_link(&dev->kobj, &ne->device.kobj, "irm_id"))
 611                 goto fail;
 612         if ((ne = find_entry_by_nodeid(host, host->busmgr_id)) &&
 613             sysfs_create_link(&dev->kobj, &ne->device.kobj, "busmgr_id"))
 614                 goto fail;
 615         if ((ne = find_entry_by_nodeid(host, host->node_id)) &&
 616             sysfs_create_link(&dev->kobj, &ne->device.kobj, "host_id"))
 617                 goto fail;
 618         return;
 619 fail:
 620         HPSB_ERR("Failed to update sysfs attributes for host %d", host->id);
 621 }
 622
 623 static void nodemgr_create_ud_dev_files(struct unit_directory *ud)
 624 {
 625         struct device *dev = &ud->device;
 626         int i;
 627
 628         for (i = 0; i < ARRAY_SIZE(fw_ud_attrs); i++)
 629                 if (device_create_file(dev, fw_ud_attrs[i]))
 630                         goto fail;
 631         if (ud->flags & UNIT_DIRECTORY_SPECIFIER_ID)
 632                 if (device_create_file(dev, &dev_attr_ud_specifier_id))
 633                         goto fail;
 634         if (ud->flags & UNIT_DIRECTORY_VERSION)
 635                 if (device_create_file(dev, &dev_attr_ud_version))
 636                         goto fail;
 637         if (ud->flags & UNIT_DIRECTORY_VENDOR_ID) {
 638                 if (device_create_file(dev, &dev_attr_ud_vendor_id))
 639                         goto fail;
 640                 if (ud->vendor_name_kv &&
 641                     device_create_file(dev, &dev_attr_ud_vendor_name_kv))
 642                         goto fail;
 643         }
 644         if (ud->flags & UNIT_DIRECTORY_MODEL_ID) {
 645                 if (device_create_file(dev, &dev_attr_ud_model_id))
 646                         goto fail;
 647                 if (ud->model_name_kv &&
 648                     device_create_file(dev, &dev_attr_ud_model_name_kv))
 649                         goto fail;
 650         }
 651         return;
 652 fail:
 653         HPSB_ERR("Failed to add sysfs attribute");
 654 }
 655
 656
 657 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv)
 658 {
 659         struct hpsb_protocol_driver *driver;
 660         struct unit_directory *ud;
 661         const struct ieee1394_device_id *id;
 662
 663         /* We only match unit directories */
 664         if (dev->platform_data != &nodemgr_ud_platform_data)
 665                 return 0;
 666
 667         ud = container_of(dev, struct unit_directory, device);
 668         if (ud->ne->in_limbo || ud->ignore_driver)
 669                 return 0;
 670
 671         /* We only match drivers of type hpsb_protocol_driver */
 672         if (drv == &nodemgr_mid_layer_driver)
 673                 return 0;
 674
 675         driver = container_of(drv, struct hpsb_protocol_driver, driver);
 676         id = driver->id_table;
 677         if (!id)
 678                 return 0;
 679
 680         for (; id->match_flags != 0; id++) {
 681                 if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) &&
 682                     id->vendor_id != ud->vendor_id)
 683                         continue;
 684
 685                 if ((id->match_flags & IEEE1394_MATCH_MODEL_ID) &&
 686                     id->model_id != ud->model_id)
 687                         continue;
 688
 689                 if ((id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) &&
 690                     id->specifier_id != ud->specifier_id)
 691                         continue;
 692
 693                 if ((id->match_flags & IEEE1394_MATCH_VERSION) &&
 694                     id->version != ud->version)
 695                         continue;
 696
 697                 return 1;
 698         }
 699
 700         return 0;
 701 }
 702
 703
 704 static DEFINE_MUTEX(nodemgr_serialize_remove_uds);
 705
 706 static int match_ne(struct device *dev, void *data)
 707 {
 708         struct unit_directory *ud;
 709         struct node_entry *ne = data;
 710
 711         ud = container_of(dev, struct unit_directory, unit_dev);
 712         return ud->ne == ne;
 713 }
 714
 715 static void nodemgr_remove_uds(struct node_entry *ne)
 716 {
 717         struct device *dev;
 718         struct unit_directory *ud;
 719
 720         /* Use class_find device to iterate the devices. Since this code
 721          * may be called from other contexts besides the knodemgrds,
 722          * protect it by nodemgr_serialize_remove_uds.
 723          */
 724         mutex_lock(&nodemgr_serialize_remove_uds);
 725         for (;;) {
 726                 dev = class_find_device(&nodemgr_ud_class, NULL, ne, match_ne);
 727                 if (!dev)
 728                         break;
 729                 ud = container_of(dev, struct unit_directory, unit_dev);
 730                 put_device(dev);
 731                 device_unregister(&ud->unit_dev);
 732                 device_unregister(&ud->device);
 733         }
 734         mutex_unlock(&nodemgr_serialize_remove_uds);
 735 }
 736
 737
 738 static void nodemgr_remove_ne(struct node_entry *ne)
 739 {
 740         struct device *dev;
 741
 742         dev = get_device(&ne->device);
 743         if (!dev)
 744                 return;
 745
 746         HPSB_DEBUG("Node removed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 747                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
 748         nodemgr_remove_uds(ne);
 749
 750         device_unregister(&ne->node_dev);
 751         device_unregister(dev);
 752
 753         put_device(dev);
 754 }
 755
 756 static int remove_host_dev(struct device *dev, void *data)
 757 {
 758         if (dev->bus == &ieee1394_bus_type)
 759                 nodemgr_remove_ne(container_of(dev, struct node_entry,
 760                                   device));
 761         return 0;
 762 }
 763
 764 static void nodemgr_remove_host_dev(struct device *dev)
 765 {
 766         device_for_each_child(dev, NULL, remove_host_dev);
 767         sysfs_remove_link(&dev->kobj, "irm_id");
 768         sysfs_remove_link(&dev->kobj, "busmgr_id");
 769         sysfs_remove_link(&dev->kobj, "host_id");
 770 }
 771
 772
 773 static void nodemgr_update_bus_options(struct node_entry *ne)
 774 {
 775 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
 776         static const u16 mr[] = { 4, 64, 1024, 0};
 777 #endif
 778         quadlet_t busoptions = be32_to_cpu(ne->csr->bus_info_data[2]);
 779
 780         ne->busopt.irmc         = (busoptions >> 31) & 1;
 781         ne->busopt.cmc          = (busoptions >> 30) & 1;
 782         ne->busopt.isc          = (busoptions >> 29) & 1;
 783         ne->busopt.bmc          = (busoptions >> 28) & 1;
 784         ne->busopt.pmc          = (busoptions >> 27) & 1;
 785         ne->busopt.cyc_clk_acc  = (busoptions >> 16) & 0xff;
 786         ne->busopt.max_rec      = 1 << (((busoptions >> 12) & 0xf) + 1);
 787         ne->busopt.max_rom      = (busoptions >> 8) & 0x3;
 788         ne->busopt.generation   = (busoptions >> 4) & 0xf;
 789         ne->busopt.lnkspd       = busoptions & 0x7;
 790
 791         HPSB_VERBOSE("NodeMgr: raw=0x%08x irmc=%d cmc=%d isc=%d bmc=%d pmc=%d "
 792                      "cyc_clk_acc=%d max_rec=%d max_rom=%d gen=%d lspd=%d",
 793                      busoptions, ne->busopt.irmc, ne->busopt.cmc,
 794                      ne->busopt.isc, ne->busopt.bmc, ne->busopt.pmc,
 795                      ne->busopt.cyc_clk_acc, ne->busopt.max_rec,
 796                      mr[ne->busopt.max_rom],
 797                      ne->busopt.generation, ne->busopt.lnkspd);
 798 }
 799
 800
 801 static struct node_entry *nodemgr_create_node(octlet_t guid,
 802                                 struct csr1212_csr *csr, struct hpsb_host *host,
 803                                 nodeid_t nodeid, unsigned int generation)
 804 {
 805         struct node_entry *ne;
 806
 807         ne = kzalloc(sizeof(*ne), GFP_KERNEL);
 808         if (!ne)
 809                 goto fail_alloc;
 810
 811         ne->host = host;
 812         ne->nodeid = nodeid;
 813         ne->generation = generation;
 814         ne->needs_probe = true;
 815
 816         ne->guid = guid;
 817         ne->guid_vendor_id = (guid >> 40) & 0xffffff;
 818         ne->csr = csr;
 819
 820         memcpy(&ne->device, &nodemgr_dev_template_ne,
 821                sizeof(ne->device));
 822         ne->device.parent = &host->device;
 823         dev_set_name(&ne->device, "%016Lx", (unsigned long long)(ne->guid));
 824
 825         ne->node_dev.parent = &ne->device;
 826         ne->node_dev.class = &nodemgr_ne_class;
 827         dev_set_name(&ne->node_dev, "%016Lx", (unsigned long long)(ne->guid));
 828
 829         if (device_register(&ne->device))
 830                 goto fail_devreg;
 831         if (device_register(&ne->node_dev))
 832                 goto fail_classdevreg;
 833         get_device(&ne->device);
 834
 835         nodemgr_create_ne_dev_files(ne);
 836
 837         nodemgr_update_bus_options(ne);
 838
 839         HPSB_DEBUG("%s added: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 840                    (host->node_id == nodeid) ? "Host" : "Node",
 841                    NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
 842
 843         return ne;
 844
 845 fail_classdevreg:
 846         device_unregister(&ne->device);
 847 fail_devreg:
 848         kfree(ne);
 849 fail_alloc:
 850         HPSB_ERR("Failed to create node ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 851                  NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
 852
 853         return NULL;
 854 }
 855
 856 static int match_ne_guid(struct device *dev, void *data)
 857 {
 858         struct node_entry *ne;
 859         u64 *guid = data;
 860
 861         ne = container_of(dev, struct node_entry, node_dev);
 862         return ne->guid == *guid;
 863 }
 864
 865 static struct node_entry *find_entry_by_guid(u64 guid)
 866 {
 867         struct device *dev;
 868         struct node_entry *ne;
 869
 870         dev = class_find_device(&nodemgr_ne_class, NULL, &guid, match_ne_guid);
 871         if (!dev)
 872                 return NULL;
 873         ne = container_of(dev, struct node_entry, node_dev);
 874         put_device(dev);
 875
 876         return ne;
 877 }
 878
 879 struct match_nodeid_parameter {
 880         struct hpsb_host *host;
 881         nodeid_t nodeid;
 882 };
 883
 884 static int match_ne_nodeid(struct device *dev, void *data)
 885 {
 886         int found = 0;
 887         struct node_entry *ne;
 888         struct match_nodeid_parameter *p = data;
 889
 890         if (!dev)
 891                 goto ret;
 892         ne = container_of(dev, struct node_entry, node_dev);
 893         if (ne->host == p->host && ne->nodeid == p->nodeid)
 894                 found = 1;
 895 ret:
 896         return found;
 897 }
 898
 899 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
 900                                                nodeid_t nodeid)
 901 {
 902         struct device *dev;
 903         struct node_entry *ne;
 904         struct match_nodeid_parameter p;
 905
 906         p.host = host;
 907         p.nodeid = nodeid;
 908
 909         dev = class_find_device(&nodemgr_ne_class, NULL, &p, match_ne_nodeid);
 910         if (!dev)
 911                 return NULL;
 912         ne = container_of(dev, struct node_entry, node_dev);
 913         put_device(dev);
 914
 915         return ne;
 916 }
 917
 918
 919 static void nodemgr_register_device(struct node_entry *ne,
 920         struct unit_directory *ud, struct device *parent)
 921 {
 922         memcpy(&ud->device, &nodemgr_dev_template_ud,
 923                sizeof(ud->device));
 924
 925         ud->device.parent = parent;
 926
 927         dev_set_name(&ud->device, "%s-%u", dev_name(&ne->device), ud->id);
 928
 929         ud->unit_dev.parent = &ud->device;
 930         ud->unit_dev.class = &nodemgr_ud_class;
 931         dev_set_name(&ud->unit_dev, "%s-%u", dev_name(&ne->device), ud->id);
 932
 933         if (device_register(&ud->device))
 934                 goto fail_devreg;
 935         if (device_register(&ud->unit_dev))
 936                 goto fail_classdevreg;
 937         get_device(&ud->device);
 938
 939         nodemgr_create_ud_dev_files(ud);
 940
 941         return;
 942
 943 fail_classdevreg:
 944         device_unregister(&ud->device);
 945 fail_devreg:
 946         HPSB_ERR("Failed to create unit %s", dev_name(&ud->device));
 947 }
 948
 949
 950 /* This implementation currently only scans the config rom and its
 951  * immediate unit directories looking for software_id and
 952  * software_version entries, in order to get driver autoloading working. */
 953 static struct unit_directory *nodemgr_process_unit_directory
 954         (struct node_entry *ne, struct csr1212_keyval *ud_kv,
 955          unsigned int *id, struct unit_directory *parent)
 956 {
 957         struct unit_directory *ud;
 958         struct unit_directory *ud_child = NULL;
 959         struct csr1212_dentry *dentry;
 960         struct csr1212_keyval *kv;
 961         u8 last_key_id = 0;
 962
 963         ud = kzalloc(sizeof(*ud), GFP_KERNEL);
 964         if (!ud)
 965                 goto unit_directory_error;
 966
 967         ud->ne = ne;
 968         ud->ignore_driver = ignore_drivers;
 969         ud->address = ud_kv->offset + CSR1212_REGISTER_SPACE_BASE;
 970         ud->directory_id = ud->address & 0xffffff;
 971         ud->ud_kv = ud_kv;
 972         ud->id = (*id)++;
 973
 974         /* inherit vendor_id from root directory if none exists in unit dir */
 975         ud->vendor_id = ne->vendor_id;
 976
 977         csr1212_for_each_dir_entry(ne->csr, kv, ud_kv, dentry) {
 978                 switch (kv->key.id) {
 979                 case CSR1212_KV_ID_VENDOR:
 980                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
 981                                 ud->vendor_id = kv->value.immediate;
 982                                 ud->flags |= UNIT_DIRECTORY_VENDOR_ID;
 983                         }
 984                         break;
 985
 986                 case CSR1212_KV_ID_MODEL:
 987                         ud->model_id = kv->value.immediate;
 988                         ud->flags |= UNIT_DIRECTORY_MODEL_ID;
 989                         break;
 990
 991                 case CSR1212_KV_ID_SPECIFIER_ID:
 992                         ud->specifier_id = kv->value.immediate;
 993                         ud->flags |= UNIT_DIRECTORY_SPECIFIER_ID;
 994                         break;
 995
 996                 case CSR1212_KV_ID_VERSION:
 997                         ud->version = kv->value.immediate;
 998                         ud->flags |= UNIT_DIRECTORY_VERSION;
 999                         break;
1000
1001                 case CSR1212_KV_ID_DESCRIPTOR:
1002                         if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1003                             CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1004                             CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1005                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1006                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1007                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1008                                 switch (last_key_id) {
1009                                 case CSR1212_KV_ID_VENDOR:
1010                                         csr1212_keep_keyval(kv);
1011                                         ud->vendor_name_kv = kv;
1012                                         break;
1013
1014                                 case CSR1212_KV_ID_MODEL:
1015                                         csr1212_keep_keyval(kv);
1016                                         ud->model_name_kv = kv;
1017                                         break;
1018
1019                                 }
1020                         } /* else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) ... */
1021                         break;
1022
1023                 case CSR1212_KV_ID_DEPENDENT_INFO:
1024                         /* Logical Unit Number */
1025                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
1026                                 if (ud->flags & UNIT_DIRECTORY_HAS_LUN) {
1027                                         ud_child = kmemdup(ud, sizeof(*ud_child), GFP_KERNEL);
1028                                         if (!ud_child)
1029                                                 goto unit_directory_error;
1030                                         nodemgr_register_device(ne, ud_child, &ne->device);
1031                                         ud_child = NULL;
1032
1033                                         ud->id = (*id)++;
1034                                 }
1035                                 ud->lun = kv->value.immediate;
1036                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN;
1037
1038                         /* Logical Unit Directory */
1039                         } else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) {
1040                                 /* This should really be done in SBP2 as this is
1041                                  * doing SBP2 specific parsing.
1042                                  */
1043
1044                                 /* first register the parent unit */
1045                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN_DIRECTORY;
1046                                 if (ud->device.bus != &ieee1394_bus_type)
1047                                         nodemgr_register_device(ne, ud, &ne->device);
1048
1049                                 /* process the child unit */
1050                                 ud_child = nodemgr_process_unit_directory(ne, kv, id, ud);
1051
1052                                 if (ud_child == NULL)
1053                                         break;
1054
1055                                 /* inherit unspecified values, the driver core picks it up */
1056                                 if ((ud->flags & UNIT_DIRECTORY_MODEL_ID) &&
1057                                     !(ud_child->flags & UNIT_DIRECTORY_MODEL_ID))
1058                                 {
1059                                         ud_child->flags |=  UNIT_DIRECTORY_MODEL_ID;
1060                                         ud_child->model_id = ud->model_id;
1061                                 }
1062                                 if ((ud->flags & UNIT_DIRECTORY_SPECIFIER_ID) &&
1063                                     !(ud_child->flags & UNIT_DIRECTORY_SPECIFIER_ID))
1064                                 {
1065                                         ud_child->flags |=  UNIT_DIRECTORY_SPECIFIER_ID;
1066                                         ud_child->specifier_id = ud->specifier_id;
1067                                 }
1068                                 if ((ud->flags & UNIT_DIRECTORY_VERSION) &&
1069                                     !(ud_child->flags & UNIT_DIRECTORY_VERSION))
1070                                 {
1071                                         ud_child->flags |=  UNIT_DIRECTORY_VERSION;
1072                                         ud_child->version = ud->version;
1073                                 }
1074
1075                                 /* register the child unit */
1076                                 ud_child->flags |= UNIT_DIRECTORY_LUN_DIRECTORY;
1077                                 nodemgr_register_device(ne, ud_child, &ud->device);
1078                         }
1079
1080                         break;
1081
1082                 case CSR1212_KV_ID_DIRECTORY_ID:
1083                         ud->directory_id = kv->value.immediate;
1084                         break;
1085
1086                 default:
1087                         break;
1088                 }
1089                 last_key_id = kv->key.id;
1090         }
1091
1092         /* do not process child units here and only if not already registered */
1093         if (!parent && ud->device.bus != &ieee1394_bus_type)
1094                 nodemgr_register_device(ne, ud, &ne->device);
1095
1096         return ud;
1097
1098 unit_directory_error:
1099         kfree(ud);
1100         return NULL;
1101 }
1102
1103
1104 static void nodemgr_process_root_directory(struct node_entry *ne)
1105 {
1106         unsigned int ud_id = 0;
1107         struct csr1212_dentry *dentry;
1108         struct csr1212_keyval *kv, *vendor_name_kv = NULL;
1109         u8 last_key_id = 0;
1110
1111         ne->needs_probe = false;
1112
1113         csr1212_for_each_dir_entry(ne->csr, kv, ne->csr->root_kv, dentry) {
1114                 switch (kv->key.id) {
1115                 case CSR1212_KV_ID_VENDOR:
1116                         ne->vendor_id = kv->value.immediate;
1117                         break;
1118
1119                 case CSR1212_KV_ID_NODE_CAPABILITIES:
1120                         ne->capabilities = kv->value.immediate;
1121                         break;
1122
1123                 case CSR1212_KV_ID_UNIT:
1124                         nodemgr_process_unit_directory(ne, kv, &ud_id, NULL);
1125                         break;
1126
1127                 case CSR1212_KV_ID_DESCRIPTOR:
1128                         if (last_key_id == CSR1212_KV_ID_VENDOR) {
1129                                 if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1130                                     CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1131                                     CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1132                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1133                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1134                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1135                                         csr1212_keep_keyval(kv);
1136                                         vendor_name_kv = kv;
1137                                 }
1138                         }
1139                         break;
1140                 }
1141                 last_key_id = kv->key.id;
1142         }
1143
1144         if (ne->vendor_name_kv) {
1145                 kv = ne->vendor_name_kv;
1146                 ne->vendor_name_kv = vendor_name_kv;
1147                 csr1212_release_keyval(kv);
1148         } else if (vendor_name_kv) {
1149                 ne->vendor_name_kv = vendor_name_kv;
1150                 if (device_create_file(&ne->device,
1151                                        &dev_attr_ne_vendor_name_kv) != 0)
1152                         HPSB_ERR("Failed to add sysfs attribute");
1153         }
1154 }
1155
1156 #ifdef CONFIG_HOTPLUG
1157
1158 static int nodemgr_uevent(struct device *dev, struct kobj_uevent_env *env)
1159 {
1160         struct unit_directory *ud;
1161         int retval = 0;
1162         /* ieee1394:venNmoNspNverN */
1163         char buf[8 + 1 + 3 + 8 + 2 + 8 + 2 + 8 + 3 + 8 + 1];
1164
1165         if (!dev)
1166                 return -ENODEV;
1167
1168         ud = container_of(dev, struct unit_directory, unit_dev);
1169
1170         if (ud->ne->in_limbo || ud->ignore_driver)
1171                 return -ENODEV;
1172
1173 #define PUT_ENVP(fmt,val)                                       \
1174 do {                                                            \
1175         retval = add_uevent_var(env, fmt, val);         \
1176         if (retval)                                             \
1177                 return retval;                                  \
1178 } while (0)
1179
1180         PUT_ENVP("VENDOR_ID=%06x", ud->vendor_id);
1181         PUT_ENVP("MODEL_ID=%06x", ud->model_id);
1182         PUT_ENVP("GUID=%016Lx", (unsigned long long)ud->ne->guid);
1183         PUT_ENVP("SPECIFIER_ID=%06x", ud->specifier_id);
1184         PUT_ENVP("VERSION=%06x", ud->version);
1185         snprintf(buf, sizeof(buf), "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
1186                         ud->vendor_id,
1187                         ud->model_id,
1188                         ud->specifier_id,
1189                         ud->version);
1190         PUT_ENVP("MODALIAS=%s", buf);
1191
1192 #undef PUT_ENVP
1193
1194         return 0;
1195 }
1196
1197 #else
1198
1199 static int nodemgr_uevent(struct device *dev, struct kobj_uevent_env *env)
1200 {
1201         return -ENODEV;
1202 }
1203
1204 #endif /* CONFIG_HOTPLUG */
1205
1206
1207 int __hpsb_register_protocol(struct hpsb_protocol_driver *drv,
1208                              struct module *owner)
1209 {
1210         int error;
1211
1212         drv->driver.bus = &ieee1394_bus_type;
1213         drv->driver.owner = owner;
1214         drv->driver.name = drv->name;
1215
1216         /* This will cause a probe for devices */
1217         error = driver_register(&drv->driver);
1218         if (!error)
1219                 nodemgr_create_drv_files(drv);
1220         return error;
1221 }
1222
1223 void hpsb_unregister_protocol(struct hpsb_protocol_driver *driver)
1224 {
1225         nodemgr_remove_drv_files(driver);
1226         /* This will subsequently disconnect all devices that our driver
1227          * is attached to. */
1228         driver_unregister(&driver->driver);
1229 }
1230
1231
1232 /*
1233  * This function updates nodes that were present on the bus before the
1234  * reset and still are after the reset.  The nodeid and the config rom
1235  * may have changed, and the drivers managing this device must be
1236  * informed that this device just went through a bus reset, to allow
1237  * the to take whatever actions required.
1238  */
1239 static void nodemgr_update_node(struct node_entry *ne, struct csr1212_csr *csr,
1240                                 nodeid_t nodeid, unsigned int generation)
1241 {
1242         if (ne->nodeid != nodeid) {
1243                 HPSB_DEBUG("Node changed: " NODE_BUS_FMT " -> " NODE_BUS_FMT,
1244                            NODE_BUS_ARGS(ne->host, ne->nodeid),
1245                            NODE_BUS_ARGS(ne->host, nodeid));
1246                 ne->nodeid = nodeid;
1247         }
1248
1249         if (ne->busopt.generation != ((be32_to_cpu(csr->bus_info_data[2]) >> 4) & 0xf)) {
1250                 kfree(ne->csr->private);
1251                 csr1212_destroy_csr(ne->csr);
1252                 ne->csr = csr;
1253
1254                 /* If the node's configrom generation has changed, we
1255                  * unregister all the unit directories. */
1256                 nodemgr_remove_uds(ne);
1257
1258                 nodemgr_update_bus_options(ne);
1259
1260                 /* Mark the node as new, so it gets re-probed */
1261                 ne->needs_probe = true;
1262         } else {
1263                 /* old cache is valid, so update its generation */
1264                 struct nodemgr_csr_info *ci = ne->csr->private;
1265                 ci->generation = generation;
1266                 /* free the partially filled now unneeded new cache */
1267                 kfree(csr->private);
1268                 csr1212_destroy_csr(csr);
1269         }
1270
1271         /* Finally, mark the node current */
1272         smp_wmb();
1273         ne->generation = generation;
1274
1275         if (ne->in_limbo) {
1276                 device_remove_file(&ne->device, &dev_attr_ne_in_limbo);
1277                 ne->in_limbo = false;
1278
1279                 HPSB_DEBUG("Node reactivated: "
1280                            "ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1281                            NODE_BUS_ARGS(ne->host, ne->nodeid),
1282                            (unsigned long long)ne->guid);
1283         }
1284 }
1285
1286 static void nodemgr_node_scan_one(struct hpsb_host *host,
1287                                   nodeid_t nodeid, int generation)
1288 {
1289         struct node_entry *ne;
1290         octlet_t guid;
1291         struct csr1212_csr *csr;
1292         struct nodemgr_csr_info *ci;
1293         u8 *speed;
1294
1295         ci = kmalloc(sizeof(*ci), GFP_KERNEL);
1296         if (!ci)
1297                 return;
1298
1299         ci->host = host;
1300         ci->nodeid = nodeid;
1301         ci->generation = generation;
1302
1303         /* Prepare for speed probe which occurs when reading the ROM */
1304         speed = &(host->speed[NODEID_TO_NODE(nodeid)]);
1305         if (*speed > host->csr.lnk_spd)
1306                 *speed = host->csr.lnk_spd;
1307         ci->speed_unverified = *speed > IEEE1394_SPEED_100;
1308
1309         /* We need to detect when the ConfigROM's generation has changed,
1310          * so we only update the node's info when it needs to be.  */
1311
1312         csr = csr1212_create_csr(&nodemgr_csr_ops, 5 * sizeof(quadlet_t), ci);
1313         if (!csr || csr1212_parse_csr(csr) != CSR1212_SUCCESS) {
1314                 HPSB_ERR("Error parsing configrom for node " NODE_BUS_FMT,
1315                          NODE_BUS_ARGS(host, nodeid));
1316                 if (csr)
1317                         csr1212_destroy_csr(csr);
1318                 kfree(ci);
1319                 return;
1320         }
1321
1322         if (csr->bus_info_data[1] != IEEE1394_BUSID_MAGIC) {
1323                 /* This isn't a 1394 device, but we let it slide. There
1324                  * was a report of a device with broken firmware which
1325                  * reported '2394' instead of '1394', which is obviously a
1326                  * mistake. One would hope that a non-1394 device never
1327                  * gets connected to Firewire bus. If someone does, we
1328                  * shouldn't be held responsible, so we'll allow it with a
1329                  * warning.  */
1330                 HPSB_WARN("Node " NODE_BUS_FMT " has invalid busID magic [0x%08x]",
1331                           NODE_BUS_ARGS(host, nodeid), csr->bus_info_data[1]);
1332         }
1333
1334         guid = ((u64)be32_to_cpu(csr->bus_info_data[3]) << 32) | be32_to_cpu(csr->bus_info_data[4]);
1335         ne = find_entry_by_guid(guid);
1336
1337         if (ne && ne->host != host && ne->in_limbo) {
1338                 /* Must have moved this device from one host to another */
1339                 nodemgr_remove_ne(ne);
1340                 ne = NULL;
1341         }
1342
1343         if (!ne)
1344                 nodemgr_create_node(guid, csr, host, nodeid, generation);
1345         else
1346                 nodemgr_update_node(ne, csr, nodeid, generation);
1347 }
1348
1349
1350 static void nodemgr_node_scan(struct hpsb_host *host, int generation)
1351 {
1352         int count;
1353         struct selfid *sid = (struct selfid *)host->topology_map;
1354         nodeid_t nodeid = LOCAL_BUS;
1355
1356         /* Scan each node on the bus */
1357         for (count = host->selfid_count; count; count--, sid++) {
1358                 if (sid->extended)
1359                         continue;
1360
1361                 if (!sid->link_active) {
1362                         nodeid++;
1363                         continue;
1364                 }
1365                 nodemgr_node_scan_one(host, nodeid++, generation);
1366         }
1367 }
1368
1369 static void nodemgr_pause_ne(struct node_entry *ne)
1370 {
1371         HPSB_DEBUG("Node paused: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1372                    NODE_BUS_ARGS(ne->host, ne->nodeid),
1373                    (unsigned long long)ne->guid);
1374
1375         ne->in_limbo = true;
1376         WARN_ON(device_create_file(&ne->device, &dev_attr_ne_in_limbo));
1377 }
1378
1379 static int update_pdrv(struct device *dev, void *data)
1380 {
1381         struct unit_directory *ud;
1382         struct device_driver *drv;
1383         struct hpsb_protocol_driver *pdrv;
1384         struct node_entry *ne = data;
1385         int error;
1386
1387         ud = container_of(dev, struct unit_directory, unit_dev);
1388         if (ud->ne == ne) {
1389                 drv = get_driver(ud->device.driver);
1390                 if (drv) {
1391                         error = 0;
1392                         pdrv = container_of(drv, struct hpsb_protocol_driver,
1393                                             driver);
1394                         if (pdrv->update) {
1395                                 down(&ud->device.sem);
1396                                 error = pdrv->update(ud);
1397                                 up(&ud->device.sem);
1398                         }
1399                         if (error)
1400                                 device_release_driver(&ud->device);
1401                         put_driver(drv);
1402                 }
1403         }
1404
1405         return 0;
1406 }
1407
1408 static void nodemgr_update_pdrv(struct node_entry *ne)
1409 {
1410         class_for_each_device(&nodemgr_ud_class, NULL, ne, update_pdrv);
1411 }
1412
1413 /* Write the BROADCAST_CHANNEL as per IEEE1394a 8.3.2.3.11 and 8.4.2.3.  This
1414  * seems like an optional service but in the end it is practically mandatory
1415  * as a consequence of these clauses.
1416  *
1417  * Note that we cannot do a broadcast write to all nodes at once because some
1418  * pre-1394a devices would hang. */
1419 static void nodemgr_irm_write_bc(struct node_entry *ne, int generation)
1420 {
1421         const u64 bc_addr = (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL);
1422         quadlet_t bc_remote, bc_local;
1423         int error;
1424
1425         if (!ne->host->is_irm || ne->generation != generation ||
1426             ne->nodeid == ne->host->node_id)
1427                 return;
1428
1429         bc_local = cpu_to_be32(ne->host->csr.broadcast_channel);
1430
1431         /* Check if the register is implemented and 1394a compliant. */
1432         error = hpsb_read(ne->host, ne->nodeid, generation, bc_addr, &bc_remote,
1433                           sizeof(bc_remote));
1434         if (!error && bc_remote & cpu_to_be32(0x80000000) &&
1435             bc_remote != bc_local)
1436                 hpsb_node_write(ne, bc_addr, &bc_local, sizeof(bc_local));
1437 }
1438
1439
1440 static void nodemgr_probe_ne(struct hpsb_host *host, struct node_entry *ne,
1441                              int generation)
1442 {
1443         struct device *dev;
1444
1445         if (ne->host != host || ne->in_limbo)
1446                 return;
1447
1448         dev = get_device(&ne->device);
1449         if (!dev)
1450                 return;
1451
1452         nodemgr_irm_write_bc(ne, generation);
1453
1454         /* If "needs_probe", then this is either a new or changed node we
1455          * rescan totally. If the generation matches for an existing node
1456          * (one that existed prior to the bus reset) we send update calls
1457          * down to the drivers. Otherwise, this is a dead node and we
1458          * suspend it. */
1459         if (ne->needs_probe)
1460                 nodemgr_process_root_directory(ne);
1461         else if (ne->generation == generation)
1462                 nodemgr_update_pdrv(ne);
1463         else
1464                 nodemgr_pause_ne(ne);
1465
1466         put_device(dev);
1467 }
1468
1469 struct node_probe_parameter {
1470         struct hpsb_host *host;
1471         int generation;
1472         bool probe_now;
1473 };
1474
1475 static int node_probe(struct device *dev, void *data)
1476 {
1477         struct node_probe_parameter *p = data;
1478         struct node_entry *ne;
1479
1480         if (p->generation != get_hpsb_generation(p->host))
1481                 return -EAGAIN;
1482
1483         ne = container_of(dev, struct node_entry, node_dev);
1484         if (ne->needs_probe == p->probe_now)
1485                 nodemgr_probe_ne(p->host, ne, p->generation);
1486         return 0;
1487 }
1488
1489 static int nodemgr_node_probe(struct hpsb_host *host, int generation)
1490 {
1491         struct node_probe_parameter p;
1492
1493         p.host = host;
1494         p.generation = generation;
1495         /*
1496          * Do some processing of the nodes we've probed. This pulls them
1497          * into the sysfs layer if needed, and can result in processing of
1498          * unit-directories, or just updating the node and it's
1499          * unit-directories.
1500          *
1501          * Run updates before probes. Usually, updates are time-critical
1502          * while probes are time-consuming.
1503          *
1504          * Meanwhile, another bus reset may have happened. In this case we
1505          * skip everything here and let the next bus scan handle it.
1506          * Otherwise we may prematurely remove nodes which are still there.
1507          */
1508         p.probe_now = false;
1509         if (class_for_each_device(&nodemgr_ne_class, NULL, &p, node_probe) != 0)
1510                 return 0;
1511
1512         p.probe_now = true;
1513         if (class_for_each_device(&nodemgr_ne_class, NULL, &p, node_probe) != 0)
1514                 return 0;
1515         /*
1516          * Now let's tell the bus to rescan our devices. This may seem
1517          * like overhead, but the driver-model core will only scan a
1518          * device for a driver when either the device is added, or when a
1519          * new driver is added. A bus reset is a good reason to rescan
1520          * devices that were there before.  For example, an sbp2 device
1521          * may become available for login, if the host that held it was
1522          * just removed.
1523          */
1524         if (bus_rescan_devices(&ieee1394_bus_type) != 0)
1525                 HPSB_DEBUG("bus_rescan_devices had an error");
1526
1527         return 1;
1528 }
1529
1530 static int remove_nodes_in_limbo(struct device *dev, void *data)
1531 {
1532         struct node_entry *ne;
1533
1534         if (dev->bus != &ieee1394_bus_type)
1535                 return 0;
1536
1537         ne = container_of(dev, struct node_entry, device);
1538         if (ne->in_limbo)
1539                 nodemgr_remove_ne(ne);
1540
1541         return 0;
1542 }
1543
1544 static void nodemgr_remove_nodes_in_limbo(struct hpsb_host *host)
1545 {
1546         device_for_each_child(&host->device, NULL, remove_nodes_in_limbo);
1547 }
1548
1549 static int nodemgr_send_resume_packet(struct hpsb_host *host)
1550 {
1551         struct hpsb_packet *packet;
1552         int error = -ENOMEM;
1553
1554         packet = hpsb_make_phypacket(host,
1555                         EXTPHYPACKET_TYPE_RESUME |
1556                         NODEID_TO_NODE(host->node_id) << PHYPACKET_PORT_SHIFT);
1557         if (packet) {
1558                 packet->no_waiter = 1;
1559                 packet->generation = get_hpsb_generation(host);
1560                 error = hpsb_send_packet(packet);
1561         }
1562         if (error)
1563                 HPSB_WARN("fw-host%d: Failed to broadcast resume packet",
1564                           host->id);
1565         return error;
1566 }
1567
1568 /* Perform a few high-level IRM responsibilities. */
1569 static int nodemgr_do_irm_duties(struct hpsb_host *host, int cycles)
1570 {
1571         quadlet_t bc;
1572
1573         /* if irm_id == -1 then there is no IRM on this bus */
1574         if (!host->is_irm || host->irm_id == (nodeid_t)-1)
1575                 return 1;
1576
1577         /* We are a 1394a-2000 compliant IRM. Set the validity bit. */
1578         host->csr.broadcast_channel |= 0x40000000;
1579
1580         /* If there is no bus manager then we should set the root node's
1581          * force_root bit to promote bus stability per the 1394
1582          * spec. (8.4.2.6) */
1583         if (host->busmgr_id == 0xffff && host->node_count > 1)
1584         {
1585                 u16 root_node = host->node_count - 1;
1586
1587                 /* get cycle master capability flag from root node */
1588                 if (host->is_cycmst ||
1589                     (!hpsb_read(host, LOCAL_BUS | root_node, get_hpsb_generation(host),
1590                                 (CSR_REGISTER_BASE + CSR_CONFIG_ROM + 2 * sizeof(quadlet_t)),
1591                                 &bc, sizeof(quadlet_t)) &&
1592                      be32_to_cpu(bc) & 1 << CSR_CMC_SHIFT))
1593                         hpsb_send_phy_config(host, root_node, -1);
1594                 else {
1595                         HPSB_DEBUG("The root node is not cycle master capable; "
1596                                    "selecting a new root node and resetting...");
1597
1598                         if (cycles >= 5) {
1599                                 /* Oh screw it! Just leave the bus as it is */
1600                                 HPSB_DEBUG("Stopping reset loop for IRM sanity");
1601                                 return 1;
1602                         }
1603
1604                         hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1605                         hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1606
1607                         return 0;
1608                 }
1609         }
1610
1611         /* Some devices suspend their ports while being connected to an inactive
1612          * host adapter, i.e. if connected before the low-level driver is
1613          * loaded.  They become visible either when physically unplugged and
1614          * replugged, or when receiving a resume packet.  Send one once. */
1615         if (!host->resume_packet_sent && !nodemgr_send_resume_packet(host))
1616                 host->resume_packet_sent = 1;
1617
1618         return 1;
1619 }
1620
1621 /* We need to ensure that if we are not the IRM, that the IRM node is capable of
1622  * everything we can do, otherwise issue a bus reset and try to become the IRM
1623  * ourselves. */
1624 static int nodemgr_check_irm_capability(struct hpsb_host *host, int cycles)
1625 {
1626         quadlet_t bc;
1627         int status;
1628
1629         if (hpsb_disable_irm || host->is_irm)
1630                 return 1;
1631
1632         status = hpsb_read(host, LOCAL_BUS | (host->irm_id),
1633                            get_hpsb_generation(host),
1634                            (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL),
1635                            &bc, sizeof(quadlet_t));
1636
1637         if (status < 0 || !(be32_to_cpu(bc) & 0x80000000)) {
1638                 /* The current irm node does not have a valid BROADCAST_CHANNEL
1639                  * register and we do, so reset the bus with force_root set */
1640                 HPSB_DEBUG("Current remote IRM is not 1394a-2000 compliant, resetting...");
1641
1642                 if (cycles >= 5) {
1643                         /* Oh screw it! Just leave the bus as it is */
1644                         HPSB_DEBUG("Stopping reset loop for IRM sanity");
1645                         return 1;
1646                 }
1647
1648                 hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1649                 hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1650
1651                 return 0;
1652         }
1653
1654         return 1;
1655 }
1656
1657 static int nodemgr_host_thread(void *data)
1658 {
1659         struct hpsb_host *host = data;
1660         unsigned int g, generation = 0;
1661         int i, reset_cycles = 0;
1662
1663         set_freezable();
1664         /* Setup our device-model entries */
1665         nodemgr_create_host_dev_files(host);
1666
1667         for (;;) {
1668                 /* Sleep until next bus reset */
1669                 set_current_state(TASK_INTERRUPTIBLE);
1670                 if (get_hpsb_generation(host) == generation &&
1671                     !kthread_should_stop())
1672                         schedule();
1673                 __set_current_state(TASK_RUNNING);
1674
1675                 /* Thread may have been woken up to freeze or to exit */
1676                 if (try_to_freeze())
1677                         continue;
1678                 if (kthread_should_stop())
1679                         goto exit;
1680
1681                 /* Pause for 1/4 second in 1/16 second intervals,
1682                  * to make sure things settle down. */
1683                 g = get_hpsb_generation(host);
1684                 for (i = 0; i < 4 ; i++) {
1685                         msleep_interruptible(63);
1686                         try_to_freeze();
1687                         if (kthread_should_stop())
1688                                 goto exit;
1689
1690                         /* Now get the generation in which the node ID's we collect
1691                          * are valid.  During the bus scan we will use this generation
1692                          * for the read transactions, so that if another reset occurs
1693                          * during the scan the transactions will fail instead of
1694                          * returning bogus data. */
1695                         generation = get_hpsb_generation(host);
1696
1697                         /* If we get a reset before we are done waiting, then
1698                          * start the waiting over again */
1699                         if (generation != g)
1700                                 g = generation, i = 0;
1701                 }
1702
1703                 if (!nodemgr_check_irm_capability(host, reset_cycles) ||
1704                     !nodemgr_do_irm_duties(host, reset_cycles)) {
1705                         reset_cycles++;
1706                         continue;
1707                 }
1708                 reset_cycles = 0;
1709
1710                 /* Scan our nodes to get the bus options and create node
1711                  * entries. This does not do the sysfs stuff, since that
1712                  * would trigger uevents and such, which is a bad idea at
1713                  * this point. */
1714                 nodemgr_node_scan(host, generation);
1715
1716                 /* This actually does the full probe, with sysfs
1717                  * registration. */
1718                 if (!nodemgr_node_probe(host, generation))
1719                         continue;
1720
1721                 /* Update some of our sysfs symlinks */
1722                 nodemgr_update_host_dev_links(host);
1723
1724                 /* Sleep 3 seconds */
1725                 for (i = 3000/200; i; i--) {
1726                         msleep_interruptible(200);
1727                         try_to_freeze();
1728                         if (kthread_should_stop())
1729                                 goto exit;
1730
1731                         if (generation != get_hpsb_generation(host))
1732                                 break;
1733                 }
1734                 /* Remove nodes which are gone, unless a bus reset happened */
1735                 if (!i)
1736                         nodemgr_remove_nodes_in_limbo(host);
1737         }
1738 exit:
1739         HPSB_VERBOSE("NodeMgr: Exiting thread");
1740         return 0;
1741 }
1742
1743 struct per_host_parameter {
1744         void *data;
1745         int (*cb)(struct hpsb_host *, void *);
1746 };
1747
1748 static int per_host(struct device *dev, void *data)
1749 {
1750         struct hpsb_host *host;
1751         struct per_host_parameter *p = data;
1752
1753         host = container_of(dev, struct hpsb_host, host_dev);
1754         return p->cb(host, p->data);
1755 }
1756
1757 /**
1758  * nodemgr_for_each_host - call a function for each IEEE 1394 host
1759  * @data: an address to supply to the callback
1760  * @cb: function to call for each host
1761  *
1762  * Iterate the hosts, calling a given function with supplied data for each host.
1763  * If the callback fails on a host, i.e. if it returns a non-zero value, the
1764  * iteration is stopped.
1765  *
1766  * Return value: 0 on success, non-zero on failure (same as returned by last run
1767  * of the callback).
1768  */
1769 int nodemgr_for_each_host(void *data, int (*cb)(struct hpsb_host *, void *))
1770 {
1771         struct per_host_parameter p;
1772
1773         p.cb = cb;
1774         p.data = data;
1775         return class_for_each_device(&hpsb_host_class, NULL, &p, per_host);
1776 }
1777
1778 /* The following two convenience functions use a struct node_entry
1779  * for addressing a node on the bus.  They are intended for use by any
1780  * process context, not just the nodemgr thread, so we need to be a
1781  * little careful when reading out the node ID and generation.  The
1782  * thing that can go wrong is that we get the node ID, then a bus
1783  * reset occurs, and then we read the generation.  The node ID is
1784  * possibly invalid, but the generation is current, and we end up
1785  * sending a packet to a the wrong node.
1786  *
1787  * The solution is to make sure we read the generation first, so that
1788  * if a reset occurs in the process, we end up with a stale generation
1789  * and the transactions will fail instead of silently using wrong node
1790  * ID's.
1791  */
1792
1793 /**
1794  * hpsb_node_fill_packet - fill some destination information into a packet
1795  * @ne: destination node
1796  * @packet: packet to fill in
1797  *
1798  * This will fill in the given, pre-initialised hpsb_packet with the current
1799  * information from the node entry (host, node ID, bus generation number).
1800  */
1801 void hpsb_node_fill_packet(struct node_entry *ne, struct hpsb_packet *packet)
1802 {
1803         packet->host = ne->host;
1804         packet->generation = ne->generation;
1805         smp_rmb();
1806         packet->node_id = ne->nodeid;
1807 }
1808
1809 int hpsb_node_write(struct node_entry *ne, u64 addr,
1810                     quadlet_t *buffer, size_t length)
1811 {
1812         unsigned int generation = ne->generation;
1813
1814         smp_rmb();
1815         return hpsb_write(ne->host, ne->nodeid, generation,
1816                           addr, buffer, length);
1817 }
1818
1819 static void nodemgr_add_host(struct hpsb_host *host)
1820 {
1821         struct host_info *hi;
1822
1823         hi = hpsb_create_hostinfo(&nodemgr_highlevel, host, sizeof(*hi));
1824         if (!hi) {
1825                 HPSB_ERR("NodeMgr: out of memory in add host");
1826                 return;
1827         }
1828         hi->host = host;
1829         hi->thread = kthread_run(nodemgr_host_thread, host, "knodemgrd_%d",
1830                                  host->id);
1831         if (IS_ERR(hi->thread)) {
1832                 HPSB_ERR("NodeMgr: cannot start thread for host %d", host->id);
1833                 hpsb_destroy_hostinfo(&nodemgr_highlevel, host);
1834         }
1835 }
1836
1837 static void nodemgr_host_reset(struct hpsb_host *host)
1838 {
1839         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1840
1841         if (hi) {
1842                 HPSB_VERBOSE("NodeMgr: Processing reset for host %d", host->id);
1843                 wake_up_process(hi->thread);
1844         }
1845 }
1846
1847 static void nodemgr_remove_host(struct hpsb_host *host)
1848 {
1849         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1850
1851         if (hi) {
1852                 kthread_stop(hi->thread);
1853                 nodemgr_remove_host_dev(&host->device);
1854         }
1855 }
1856
1857 static struct hpsb_highlevel nodemgr_highlevel = {
1858         .name =         "Node manager",
1859         .add_host =     nodemgr_add_host,
1860         .host_reset =   nodemgr_host_reset,
1861         .remove_host =  nodemgr_remove_host,
1862 };
1863
1864 int init_ieee1394_nodemgr(void)
1865 {
1866         int error;
1867
1868         error = class_register(&nodemgr_ne_class);
1869         if (error)
1870                 goto fail_ne;
1871         error = class_register(&nodemgr_ud_class);
1872         if (error)
1873                 goto fail_ud;
1874         error = driver_register(&nodemgr_mid_layer_driver);
1875         if (error)
1876                 goto fail_ml;
1877         /* This driver is not used if nodemgr is off (disable_nodemgr=1). */
1878         nodemgr_dev_template_host.driver = &nodemgr_mid_layer_driver;
1879
1880         hpsb_register_highlevel(&nodemgr_highlevel);
1881         return 0;
1882
1883 fail_ml:
1884         class_unregister(&nodemgr_ud_class);
1885 fail_ud:
1886         class_unregister(&nodemgr_ne_class);
1887 fail_ne:
1888         return error;
1889 }
1890
1891 void cleanup_ieee1394_nodemgr(void)
1892 {
1893         hpsb_unregister_highlevel(&nodemgr_highlevel);
1894         driver_unregister(&nodemgr_mid_layer_driver);
1895         class_unregister(&nodemgr_ud_class);
1896         class_unregister(&nodemgr_ne_class);
1897 }