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/freezer.h>
  20 #include <asm/atomic.h>
  21
  22 #include "csr.h"
  23 #include "highlevel.h"
  24 #include "hosts.h"
  25 #include "ieee1394.h"
  26 #include "ieee1394_core.h"
  27 #include "ieee1394_hotplug.h"
  28 #include "ieee1394_types.h"
  29 #include "ieee1394_transactions.h"
  30 #include "nodemgr.h"
  31
  32 static int ignore_drivers;
  33 module_param(ignore_drivers, int, S_IRUGO | S_IWUSR);
  34 MODULE_PARM_DESC(ignore_drivers, "Disable automatic probing for drivers.");
  35
  36 struct nodemgr_csr_info {
  37         struct hpsb_host *host;
  38         nodeid_t nodeid;
  39         unsigned int generation;
  40         unsigned int speed_unverified:1;
  41 };
  42
  43
  44 /*
  45  * Correct the speed map entry.  This is necessary
  46  *  - for nodes with link speed < phy speed,
  47  *  - for 1394b nodes with negotiated phy port speed < IEEE1394_SPEED_MAX.
  48  * A possible speed is determined by trial and error, using quadlet reads.
  49  */
  50 static int nodemgr_check_speed(struct nodemgr_csr_info *ci, u64 addr,
  51                                quadlet_t *buffer)
  52 {
  53         quadlet_t q;
  54         u8 i, *speed, old_speed, good_speed;
  55         int error;
  56
  57         speed = &(ci->host->speed[NODEID_TO_NODE(ci->nodeid)]);
  58         old_speed = *speed;
  59         good_speed = IEEE1394_SPEED_MAX + 1;
  60
  61         /* Try every speed from S100 to old_speed.
  62          * If we did it the other way around, a too low speed could be caught
  63          * if the retry succeeded for some other reason, e.g. because the link
  64          * just finished its initialization. */
  65         for (i = IEEE1394_SPEED_100; i <= old_speed; i++) {
  66                 *speed = i;
  67                 error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
  68                                   &q, sizeof(quadlet_t));
  69                 if (error)
  70                         break;
  71                 *buffer = q;
  72                 good_speed = i;
  73         }
  74         if (good_speed <= IEEE1394_SPEED_MAX) {
  75                 HPSB_DEBUG("Speed probe of node " NODE_BUS_FMT " yields %s",
  76                            NODE_BUS_ARGS(ci->host, ci->nodeid),
  77                            hpsb_speedto_str[good_speed]);
  78                 *speed = good_speed;
  79                 ci->speed_unverified = 0;
  80                 return 0;
  81         }
  82         *speed = old_speed;
  83         return error;
  84 }
  85
  86 static int nodemgr_bus_read(struct csr1212_csr *csr, u64 addr, u16 length,
  87                             void *buffer, void *__ci)
  88 {
  89         struct nodemgr_csr_info *ci = (struct nodemgr_csr_info*)__ci;
  90         int i, error;
  91
  92         for (i = 1; ; i++) {
  93                 error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
  94                                   buffer, length);
  95                 if (!error) {
  96                         ci->speed_unverified = 0;
  97                         break;
  98                 }
  99                 /* Give up after 3rd failure. */
 100                 if (i == 3)
 101                         break;
 102
 103                 /* The ieee1394_core guessed the node's speed capability from
 104                  * the self ID.  Check whether a lower speed works. */
 105                 if (ci->speed_unverified && length == sizeof(quadlet_t)) {
 106                         error = nodemgr_check_speed(ci, addr, buffer);
 107                         if (!error)
 108                                 break;
 109                 }
 110                 if (msleep_interruptible(334))
 111                         return -EINTR;
 112         }
 113         return error;
 114 }
 115
 116 static int nodemgr_get_max_rom(quadlet_t *bus_info_data, void *__ci)
 117 {
 118         return (be32_to_cpu(bus_info_data[2]) >> 8) & 0x3;
 119 }
 120
 121 static struct csr1212_bus_ops nodemgr_csr_ops = {
 122         .bus_read =     nodemgr_bus_read,
 123         .get_max_rom =  nodemgr_get_max_rom
 124 };
 125
 126
 127 /*
 128  * Basically what we do here is start off retrieving the bus_info block.
 129  * From there will fill in some info about the node, verify it is of IEEE
 130  * 1394 type, and that the crc checks out ok. After that we start off with
 131  * the root directory, and subdirectories. To do this, we retrieve the
 132  * quadlet header for a directory, find out the length, and retrieve the
 133  * complete directory entry (be it a leaf or a directory). We then process
 134  * it and add the info to our structure for that particular node.
 135  *
 136  * We verify CRC's along the way for each directory/block/leaf. The entire
 137  * node structure is generic, and simply stores the information in a way
 138  * that's easy to parse by the protocol interface.
 139  */
 140
 141 /*
 142  * The nodemgr relies heavily on the Driver Model for device callbacks and
 143  * driver/device mappings. The old nodemgr used to handle all this itself,
 144  * but now we are much simpler because of the LDM.
 145  */
 146
 147 static DEFINE_MUTEX(nodemgr_serialize);
 148
 149 struct host_info {
 150         struct hpsb_host *host;
 151         struct list_head list;
 152         struct task_struct *thread;
 153 };
 154
 155 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv);
 156 static int nodemgr_uevent(struct class_device *cdev, char **envp, int num_envp,
 157                           char *buffer, int buffer_size);
 158 static void nodemgr_resume_ne(struct node_entry *ne);
 159 static void nodemgr_remove_ne(struct node_entry *ne);
 160 static struct node_entry *find_entry_by_guid(u64 guid);
 161
 162 struct bus_type ieee1394_bus_type = {
 163         .name           = "ieee1394",
 164         .match          = nodemgr_bus_match,
 165 };
 166
 167 static void host_cls_release(struct class_device *class_dev)
 168 {
 169         put_device(&container_of((class_dev), struct hpsb_host, class_dev)->device);
 170 }
 171
 172 struct class hpsb_host_class = {
 173         .name           = "ieee1394_host",
 174         .release        = host_cls_release,
 175 };
 176
 177 static void ne_cls_release(struct class_device *class_dev)
 178 {
 179         put_device(&container_of((class_dev), struct node_entry, class_dev)->device);
 180 }
 181
 182 static struct class nodemgr_ne_class = {
 183         .name           = "ieee1394_node",
 184         .release        = ne_cls_release,
 185 };
 186
 187 static void ud_cls_release(struct class_device *class_dev)
 188 {
 189         put_device(&container_of((class_dev), struct unit_directory, class_dev)->device);
 190 }
 191
 192 /* The name here is only so that unit directory hotplug works with old
 193  * style hotplug, which only ever did unit directories anyway. */
 194 static struct class nodemgr_ud_class = {
 195         .name           = "ieee1394",
 196         .release        = ud_cls_release,
 197         .uevent         = nodemgr_uevent,
 198 };
 199
 200 static struct hpsb_highlevel nodemgr_highlevel;
 201
 202
 203 static void nodemgr_release_ud(struct device *dev)
 204 {
 205         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 206
 207         if (ud->vendor_name_kv)
 208                 csr1212_release_keyval(ud->vendor_name_kv);
 209         if (ud->model_name_kv)
 210                 csr1212_release_keyval(ud->model_name_kv);
 211
 212         kfree(ud);
 213 }
 214
 215 static void nodemgr_release_ne(struct device *dev)
 216 {
 217         struct node_entry *ne = container_of(dev, struct node_entry, device);
 218
 219         if (ne->vendor_name_kv)
 220                 csr1212_release_keyval(ne->vendor_name_kv);
 221
 222         kfree(ne);
 223 }
 224
 225
 226 static void nodemgr_release_host(struct device *dev)
 227 {
 228         struct hpsb_host *host = container_of(dev, struct hpsb_host, device);
 229
 230         csr1212_destroy_csr(host->csr.rom);
 231
 232         kfree(host);
 233 }
 234
 235 static int nodemgr_ud_platform_data;
 236
 237 static struct device nodemgr_dev_template_ud = {
 238         .bus            = &ieee1394_bus_type,
 239         .release        = nodemgr_release_ud,
 240         .platform_data  = &nodemgr_ud_platform_data,
 241 };
 242
 243 static struct device nodemgr_dev_template_ne = {
 244         .bus            = &ieee1394_bus_type,
 245         .release        = nodemgr_release_ne,
 246 };
 247
 248 /* This dummy driver prevents the host devices from being scanned. We have no
 249  * useful drivers for them yet, and there would be a deadlock possible if the
 250  * driver core scans the host device while the host's low-level driver (i.e.
 251  * the host's parent device) is being removed. */
 252 static struct device_driver nodemgr_mid_layer_driver = {
 253         .bus            = &ieee1394_bus_type,
 254         .name           = "nodemgr",
 255         .owner          = THIS_MODULE,
 256 };
 257
 258 struct device nodemgr_dev_template_host = {
 259         .bus            = &ieee1394_bus_type,
 260         .release        = nodemgr_release_host,
 261 };
 262
 263
 264 #define fw_attr(class, class_type, field, type, format_string)          \
 265 static ssize_t fw_show_##class##_##field (struct device *dev, struct device_attribute *attr, char *buf)\
 266 {                                                                       \
 267         class_type *class;                                              \
 268         class = container_of(dev, class_type, device);                  \
 269         return sprintf(buf, format_string, (type)class->field);         \
 270 }                                                                       \
 271 static struct device_attribute dev_attr_##class##_##field = {           \
 272         .attr = {.name = __stringify(field), .mode = S_IRUGO },         \
 273         .show   = fw_show_##class##_##field,                            \
 274 };
 275
 276 #define fw_attr_td(class, class_type, td_kv)                            \
 277 static ssize_t fw_show_##class##_##td_kv (struct device *dev, struct device_attribute *attr, char *buf)\
 278 {                                                                       \
 279         int len;                                                        \
 280         class_type *class = container_of(dev, class_type, device);      \
 281         len = (class->td_kv->value.leaf.len - 2) * sizeof(quadlet_t);   \
 282         memcpy(buf,                                                     \
 283                CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(class->td_kv),      \
 284                len);                                                    \
 285         while ((buf + len - 1) == '\0')                                 \
 286                 len--;                                                  \
 287         buf[len++] = '\n';                                              \
 288         buf[len] = '\0';                                                \
 289         return len;                                                     \
 290 }                                                                       \
 291 static struct device_attribute dev_attr_##class##_##td_kv = {           \
 292         .attr = {.name = __stringify(td_kv), .mode = S_IRUGO },         \
 293         .show   = fw_show_##class##_##td_kv,                            \
 294 };
 295
 296
 297 #define fw_drv_attr(field, type, format_string)                 \
 298 static ssize_t fw_drv_show_##field (struct device_driver *drv, char *buf) \
 299 {                                                               \
 300         struct hpsb_protocol_driver *driver;                    \
 301         driver = container_of(drv, struct hpsb_protocol_driver, driver); \
 302         return sprintf(buf, format_string, (type)driver->field);\
 303 }                                                               \
 304 static struct driver_attribute driver_attr_drv_##field = {      \
 305         .attr = {.name = __stringify(field), .mode = S_IRUGO }, \
 306         .show   = fw_drv_show_##field,                          \
 307 };
 308
 309
 310 static ssize_t fw_show_ne_bus_options(struct device *dev, struct device_attribute *attr, char *buf)
 311 {
 312         struct node_entry *ne = container_of(dev, struct node_entry, device);
 313
 314         return sprintf(buf, "IRMC(%d) CMC(%d) ISC(%d) BMC(%d) PMC(%d) GEN(%d) "
 315                        "LSPD(%d) MAX_REC(%d) MAX_ROM(%d) CYC_CLK_ACC(%d)\n",
 316                        ne->busopt.irmc,
 317                        ne->busopt.cmc, ne->busopt.isc, ne->busopt.bmc,
 318                        ne->busopt.pmc, ne->busopt.generation, ne->busopt.lnkspd,
 319                        ne->busopt.max_rec,
 320                        ne->busopt.max_rom,
 321                        ne->busopt.cyc_clk_acc);
 322 }
 323 static DEVICE_ATTR(bus_options,S_IRUGO,fw_show_ne_bus_options,NULL);
 324
 325
 326 #ifdef HPSB_DEBUG_TLABELS
 327 static ssize_t fw_show_ne_tlabels_free(struct device *dev,
 328                                        struct device_attribute *attr, char *buf)
 329 {
 330         struct node_entry *ne = container_of(dev, struct node_entry, device);
 331         unsigned long flags;
 332         unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
 333         int tf;
 334
 335         spin_lock_irqsave(&hpsb_tlabel_lock, flags);
 336         tf = 64 - bitmap_weight(tp, 64);
 337         spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
 338
 339         return sprintf(buf, "%d\n", tf);
 340 }
 341 static DEVICE_ATTR(tlabels_free,S_IRUGO,fw_show_ne_tlabels_free,NULL);
 342
 343
 344 static ssize_t fw_show_ne_tlabels_mask(struct device *dev,
 345                                        struct device_attribute *attr, char *buf)
 346 {
 347         struct node_entry *ne = container_of(dev, struct node_entry, device);
 348         unsigned long flags;
 349         unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
 350         u64 tm;
 351
 352         spin_lock_irqsave(&hpsb_tlabel_lock, flags);
 353 #if (BITS_PER_LONG <= 32)
 354         tm = ((u64)tp[0] << 32) + tp[1];
 355 #else
 356         tm = tp[0];
 357 #endif
 358         spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
 359
 360         return sprintf(buf, "0x%016llx\n", (unsigned long long)tm);
 361 }
 362 static DEVICE_ATTR(tlabels_mask, S_IRUGO, fw_show_ne_tlabels_mask, NULL);
 363 #endif /* HPSB_DEBUG_TLABELS */
 364
 365
 366 static ssize_t fw_set_ignore_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 367 {
 368         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 369         int state = simple_strtoul(buf, NULL, 10);
 370
 371         if (state == 1) {
 372                 ud->ignore_driver = 1;
 373                 device_release_driver(dev);
 374         } else if (state == 0)
 375                 ud->ignore_driver = 0;
 376
 377         return count;
 378 }
 379 static ssize_t fw_get_ignore_driver(struct device *dev, struct device_attribute *attr, char *buf)
 380 {
 381         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 382
 383         return sprintf(buf, "%d\n", ud->ignore_driver);
 384 }
 385 static DEVICE_ATTR(ignore_driver, S_IWUSR | S_IRUGO, fw_get_ignore_driver, fw_set_ignore_driver);
 386
 387
 388 static ssize_t fw_set_destroy_node(struct bus_type *bus, const char *buf, size_t count)
 389 {
 390         struct node_entry *ne;
 391         u64 guid = (u64)simple_strtoull(buf, NULL, 16);
 392
 393         ne = find_entry_by_guid(guid);
 394
 395         if (ne == NULL || !ne->in_limbo)
 396                 return -EINVAL;
 397
 398         nodemgr_remove_ne(ne);
 399
 400         return count;
 401 }
 402 static ssize_t fw_get_destroy_node(struct bus_type *bus, char *buf)
 403 {
 404         return sprintf(buf, "You can destroy in_limbo nodes by writing their GUID to this file\n");
 405 }
 406 static BUS_ATTR(destroy_node, S_IWUSR | S_IRUGO, fw_get_destroy_node, fw_set_destroy_node);
 407
 408
 409 static ssize_t fw_set_rescan(struct bus_type *bus, const char *buf,
 410                              size_t count)
 411 {
 412         int error = 0;
 413
 414         if (simple_strtoul(buf, NULL, 10) == 1)
 415                 error = bus_rescan_devices(&ieee1394_bus_type);
 416         return error ? error : count;
 417 }
 418 static ssize_t fw_get_rescan(struct bus_type *bus, char *buf)
 419 {
 420         return sprintf(buf, "You can force a rescan of the bus for "
 421                         "drivers by writing a 1 to this file\n");
 422 }
 423 static BUS_ATTR(rescan, S_IWUSR | S_IRUGO, fw_get_rescan, fw_set_rescan);
 424
 425
 426 static ssize_t fw_set_ignore_drivers(struct bus_type *bus, const char *buf, size_t count)
 427 {
 428         int state = simple_strtoul(buf, NULL, 10);
 429
 430         if (state == 1)
 431                 ignore_drivers = 1;
 432         else if (state == 0)
 433                 ignore_drivers = 0;
 434
 435         return count;
 436 }
 437 static ssize_t fw_get_ignore_drivers(struct bus_type *bus, char *buf)
 438 {
 439         return sprintf(buf, "%d\n", ignore_drivers);
 440 }
 441 static BUS_ATTR(ignore_drivers, S_IWUSR | S_IRUGO, fw_get_ignore_drivers, fw_set_ignore_drivers);
 442
 443
 444 struct bus_attribute *const fw_bus_attrs[] = {
 445         &bus_attr_destroy_node,
 446         &bus_attr_rescan,
 447         &bus_attr_ignore_drivers,
 448         NULL
 449 };
 450
 451
 452 fw_attr(ne, struct node_entry, capabilities, unsigned int, "0x%06x\n")
 453 fw_attr(ne, struct node_entry, nodeid, unsigned int, "0x%04x\n")
 454
 455 fw_attr(ne, struct node_entry, vendor_id, unsigned int, "0x%06x\n")
 456 fw_attr_td(ne, struct node_entry, vendor_name_kv)
 457
 458 fw_attr(ne, struct node_entry, guid, unsigned long long, "0x%016Lx\n")
 459 fw_attr(ne, struct node_entry, guid_vendor_id, unsigned int, "0x%06x\n")
 460 fw_attr(ne, struct node_entry, in_limbo, int, "%d\n");
 461
 462 static struct device_attribute *const fw_ne_attrs[] = {
 463         &dev_attr_ne_guid,
 464         &dev_attr_ne_guid_vendor_id,
 465         &dev_attr_ne_capabilities,
 466         &dev_attr_ne_vendor_id,
 467         &dev_attr_ne_nodeid,
 468         &dev_attr_bus_options,
 469 #ifdef HPSB_DEBUG_TLABELS
 470         &dev_attr_tlabels_free,
 471         &dev_attr_tlabels_mask,
 472 #endif
 473 };
 474
 475
 476
 477 fw_attr(ud, struct unit_directory, address, unsigned long long, "0x%016Lx\n")
 478 fw_attr(ud, struct unit_directory, length, int, "%d\n")
 479 /* These are all dependent on the value being provided */
 480 fw_attr(ud, struct unit_directory, vendor_id, unsigned int, "0x%06x\n")
 481 fw_attr(ud, struct unit_directory, model_id, unsigned int, "0x%06x\n")
 482 fw_attr(ud, struct unit_directory, specifier_id, unsigned int, "0x%06x\n")
 483 fw_attr(ud, struct unit_directory, version, unsigned int, "0x%06x\n")
 484 fw_attr_td(ud, struct unit_directory, vendor_name_kv)
 485 fw_attr_td(ud, struct unit_directory, model_name_kv)
 486
 487 static struct device_attribute *const fw_ud_attrs[] = {
 488         &dev_attr_ud_address,
 489         &dev_attr_ud_length,
 490         &dev_attr_ignore_driver,
 491 };
 492
 493
 494 fw_attr(host, struct hpsb_host, node_count, int, "%d\n")
 495 fw_attr(host, struct hpsb_host, selfid_count, int, "%d\n")
 496 fw_attr(host, struct hpsb_host, nodes_active, int, "%d\n")
 497 fw_attr(host, struct hpsb_host, in_bus_reset, int, "%d\n")
 498 fw_attr(host, struct hpsb_host, is_root, int, "%d\n")
 499 fw_attr(host, struct hpsb_host, is_cycmst, int, "%d\n")
 500 fw_attr(host, struct hpsb_host, is_irm, int, "%d\n")
 501 fw_attr(host, struct hpsb_host, is_busmgr, int, "%d\n")
 502
 503 static struct device_attribute *const fw_host_attrs[] = {
 504         &dev_attr_host_node_count,
 505         &dev_attr_host_selfid_count,
 506         &dev_attr_host_nodes_active,
 507         &dev_attr_host_in_bus_reset,
 508         &dev_attr_host_is_root,
 509         &dev_attr_host_is_cycmst,
 510         &dev_attr_host_is_irm,
 511         &dev_attr_host_is_busmgr,
 512 };
 513
 514
 515 static ssize_t fw_show_drv_device_ids(struct device_driver *drv, char *buf)
 516 {
 517         struct hpsb_protocol_driver *driver;
 518         struct ieee1394_device_id *id;
 519         int length = 0;
 520         char *scratch = buf;
 521
 522         driver = container_of(drv, struct hpsb_protocol_driver, driver);
 523
 524         for (id = driver->id_table; id->match_flags != 0; id++) {
 525                 int need_coma = 0;
 526
 527                 if (id->match_flags & IEEE1394_MATCH_VENDOR_ID) {
 528                         length += sprintf(scratch, "vendor_id=0x%06x", id->vendor_id);
 529                         scratch = buf + length;
 530                         need_coma++;
 531                 }
 532
 533                 if (id->match_flags & IEEE1394_MATCH_MODEL_ID) {
 534                         length += sprintf(scratch, "%smodel_id=0x%06x",
 535                                           need_coma++ ? "," : "",
 536                                           id->model_id);
 537                         scratch = buf + length;
 538                 }
 539
 540                 if (id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) {
 541                         length += sprintf(scratch, "%sspecifier_id=0x%06x",
 542                                           need_coma++ ? "," : "",
 543                                           id->specifier_id);
 544                         scratch = buf + length;
 545                 }
 546
 547                 if (id->match_flags & IEEE1394_MATCH_VERSION) {
 548                         length += sprintf(scratch, "%sversion=0x%06x",
 549                                           need_coma++ ? "," : "",
 550                                           id->version);
 551                         scratch = buf + length;
 552                 }
 553
 554                 if (need_coma) {
 555                         *scratch++ = '\n';
 556                         length++;
 557                 }
 558         }
 559
 560         return length;
 561 }
 562 static DRIVER_ATTR(device_ids,S_IRUGO,fw_show_drv_device_ids,NULL);
 563
 564
 565 fw_drv_attr(name, const char *, "%s\n")
 566
 567 static struct driver_attribute *const fw_drv_attrs[] = {
 568         &driver_attr_drv_name,
 569         &driver_attr_device_ids,
 570 };
 571
 572
 573 static void nodemgr_create_drv_files(struct hpsb_protocol_driver *driver)
 574 {
 575         struct device_driver *drv = &driver->driver;
 576         int i;
 577
 578         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
 579                 if (driver_create_file(drv, fw_drv_attrs[i]))
 580                         goto fail;
 581         return;
 582 fail:
 583         HPSB_ERR("Failed to add sysfs attribute for driver %s", driver->name);
 584 }
 585
 586
 587 static void nodemgr_remove_drv_files(struct hpsb_protocol_driver *driver)
 588 {
 589         struct device_driver *drv = &driver->driver;
 590         int i;
 591
 592         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
 593                 driver_remove_file(drv, fw_drv_attrs[i]);
 594 }
 595
 596
 597 static void nodemgr_create_ne_dev_files(struct node_entry *ne)
 598 {
 599         struct device *dev = &ne->device;
 600         int i;
 601
 602         for (i = 0; i < ARRAY_SIZE(fw_ne_attrs); i++)
 603                 if (device_create_file(dev, fw_ne_attrs[i]))
 604                         goto fail;
 605         return;
 606 fail:
 607         HPSB_ERR("Failed to add sysfs attribute for node %016Lx",
 608                  (unsigned long long)ne->guid);
 609 }
 610
 611
 612 static void nodemgr_create_host_dev_files(struct hpsb_host *host)
 613 {
 614         struct device *dev = &host->device;
 615         int i;
 616
 617         for (i = 0; i < ARRAY_SIZE(fw_host_attrs); i++)
 618                 if (device_create_file(dev, fw_host_attrs[i]))
 619                         goto fail;
 620         return;
 621 fail:
 622         HPSB_ERR("Failed to add sysfs attribute for host %d", host->id);
 623 }
 624
 625
 626 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
 627                                                nodeid_t nodeid);
 628
 629 static void nodemgr_update_host_dev_links(struct hpsb_host *host)
 630 {
 631         struct device *dev = &host->device;
 632         struct node_entry *ne;
 633
 634         sysfs_remove_link(&dev->kobj, "irm_id");
 635         sysfs_remove_link(&dev->kobj, "busmgr_id");
 636         sysfs_remove_link(&dev->kobj, "host_id");
 637
 638         if ((ne = find_entry_by_nodeid(host, host->irm_id)) &&
 639             sysfs_create_link(&dev->kobj, &ne->device.kobj, "irm_id"))
 640                 goto fail;
 641         if ((ne = find_entry_by_nodeid(host, host->busmgr_id)) &&
 642             sysfs_create_link(&dev->kobj, &ne->device.kobj, "busmgr_id"))
 643                 goto fail;
 644         if ((ne = find_entry_by_nodeid(host, host->node_id)) &&
 645             sysfs_create_link(&dev->kobj, &ne->device.kobj, "host_id"))
 646                 goto fail;
 647         return;
 648 fail:
 649         HPSB_ERR("Failed to update sysfs attributes for host %d", host->id);
 650 }
 651
 652 static void nodemgr_create_ud_dev_files(struct unit_directory *ud)
 653 {
 654         struct device *dev = &ud->device;
 655         int i;
 656
 657         for (i = 0; i < ARRAY_SIZE(fw_ud_attrs); i++)
 658                 if (device_create_file(dev, fw_ud_attrs[i]))
 659                         goto fail;
 660         if (ud->flags & UNIT_DIRECTORY_SPECIFIER_ID)
 661                 if (device_create_file(dev, &dev_attr_ud_specifier_id))
 662                         goto fail;
 663         if (ud->flags & UNIT_DIRECTORY_VERSION)
 664                 if (device_create_file(dev, &dev_attr_ud_version))
 665                         goto fail;
 666         if (ud->flags & UNIT_DIRECTORY_VENDOR_ID) {
 667                 if (device_create_file(dev, &dev_attr_ud_vendor_id))
 668                         goto fail;
 669                 if (ud->vendor_name_kv &&
 670                     device_create_file(dev, &dev_attr_ud_vendor_name_kv))
 671                         goto fail;
 672         }
 673         if (ud->flags & UNIT_DIRECTORY_MODEL_ID) {
 674                 if (device_create_file(dev, &dev_attr_ud_model_id))
 675                         goto fail;
 676                 if (ud->model_name_kv &&
 677                     device_create_file(dev, &dev_attr_ud_model_name_kv))
 678                         goto fail;
 679         }
 680         return;
 681 fail:
 682         HPSB_ERR("Failed to add sysfs attributes for unit %s",
 683                  ud->device.bus_id);
 684 }
 685
 686
 687 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv)
 688 {
 689         struct hpsb_protocol_driver *driver;
 690         struct unit_directory *ud;
 691         struct ieee1394_device_id *id;
 692
 693         /* We only match unit directories */
 694         if (dev->platform_data != &nodemgr_ud_platform_data)
 695                 return 0;
 696
 697         ud = container_of(dev, struct unit_directory, device);
 698         if (ud->ne->in_limbo || ud->ignore_driver)
 699                 return 0;
 700
 701         /* We only match drivers of type hpsb_protocol_driver */
 702         if (drv == &nodemgr_mid_layer_driver)
 703                 return 0;
 704
 705         driver = container_of(drv, struct hpsb_protocol_driver, driver);
 706         for (id = driver->id_table; id->match_flags != 0; id++) {
 707                 if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) &&
 708                     id->vendor_id != ud->vendor_id)
 709                         continue;
 710
 711                 if ((id->match_flags & IEEE1394_MATCH_MODEL_ID) &&
 712                     id->model_id != ud->model_id)
 713                         continue;
 714
 715                 if ((id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) &&
 716                     id->specifier_id != ud->specifier_id)
 717                         continue;
 718
 719                 if ((id->match_flags & IEEE1394_MATCH_VERSION) &&
 720                     id->version != ud->version)
 721                         continue;
 722
 723                 return 1;
 724         }
 725
 726         return 0;
 727 }
 728
 729
 730 static DEFINE_MUTEX(nodemgr_serialize_remove_uds);
 731
 732 static void nodemgr_remove_uds(struct node_entry *ne)
 733 {
 734         struct class_device *cdev;
 735         struct unit_directory *tmp, *ud;
 736
 737         /* Iteration over nodemgr_ud_class.children has to be protected by
 738          * nodemgr_ud_class.sem, but class_device_unregister() will eventually
 739          * take nodemgr_ud_class.sem too. Therefore pick out one ud at a time,
 740          * release the semaphore, and then unregister the ud. Since this code
 741          * may be called from other contexts besides the knodemgrds, protect the
 742          * gap after release of the semaphore by nodemgr_serialize_remove_uds.
 743          */
 744         mutex_lock(&nodemgr_serialize_remove_uds);
 745         for (;;) {
 746                 ud = NULL;
 747                 down(&nodemgr_ud_class.sem);
 748                 list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
 749                         tmp = container_of(cdev, struct unit_directory,
 750                                            class_dev);
 751                         if (tmp->ne == ne) {
 752                                 ud = tmp;
 753                                 break;
 754                         }
 755                 }
 756                 up(&nodemgr_ud_class.sem);
 757                 if (ud == NULL)
 758                         break;
 759                 class_device_unregister(&ud->class_dev);
 760                 device_unregister(&ud->device);
 761         }
 762         mutex_unlock(&nodemgr_serialize_remove_uds);
 763 }
 764
 765
 766 static void nodemgr_remove_ne(struct node_entry *ne)
 767 {
 768         struct device *dev;
 769
 770         dev = get_device(&ne->device);
 771         if (!dev)
 772                 return;
 773
 774         HPSB_DEBUG("Node removed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 775                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
 776
 777         nodemgr_remove_uds(ne);
 778
 779         class_device_unregister(&ne->class_dev);
 780         device_unregister(dev);
 781
 782         put_device(dev);
 783 }
 784
 785 static int __nodemgr_remove_host_dev(struct device *dev, void *data)
 786 {
 787         nodemgr_remove_ne(container_of(dev, struct node_entry, device));
 788         return 0;
 789 }
 790
 791 static void nodemgr_remove_host_dev(struct device *dev)
 792 {
 793         WARN_ON(device_for_each_child(dev, NULL, __nodemgr_remove_host_dev));
 794         sysfs_remove_link(&dev->kobj, "irm_id");
 795         sysfs_remove_link(&dev->kobj, "busmgr_id");
 796         sysfs_remove_link(&dev->kobj, "host_id");
 797 }
 798
 799
 800 static void nodemgr_update_bus_options(struct node_entry *ne)
 801 {
 802 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
 803         static const u16 mr[] = { 4, 64, 1024, 0};
 804 #endif
 805         quadlet_t busoptions = be32_to_cpu(ne->csr->bus_info_data[2]);
 806
 807         ne->busopt.irmc         = (busoptions >> 31) & 1;
 808         ne->busopt.cmc          = (busoptions >> 30) & 1;
 809         ne->busopt.isc          = (busoptions >> 29) & 1;
 810         ne->busopt.bmc          = (busoptions >> 28) & 1;
 811         ne->busopt.pmc          = (busoptions >> 27) & 1;
 812         ne->busopt.cyc_clk_acc  = (busoptions >> 16) & 0xff;
 813         ne->busopt.max_rec      = 1 << (((busoptions >> 12) & 0xf) + 1);
 814         ne->busopt.max_rom      = (busoptions >> 8) & 0x3;
 815         ne->busopt.generation   = (busoptions >> 4) & 0xf;
 816         ne->busopt.lnkspd       = busoptions & 0x7;
 817
 818         HPSB_VERBOSE("NodeMgr: raw=0x%08x irmc=%d cmc=%d isc=%d bmc=%d pmc=%d "
 819                      "cyc_clk_acc=%d max_rec=%d max_rom=%d gen=%d lspd=%d",
 820                      busoptions, ne->busopt.irmc, ne->busopt.cmc,
 821                      ne->busopt.isc, ne->busopt.bmc, ne->busopt.pmc,
 822                      ne->busopt.cyc_clk_acc, ne->busopt.max_rec,
 823                      mr[ne->busopt.max_rom],
 824                      ne->busopt.generation, ne->busopt.lnkspd);
 825 }
 826
 827
 828 static struct node_entry *nodemgr_create_node(octlet_t guid, struct csr1212_csr *csr,
 829                                               struct host_info *hi, nodeid_t nodeid,
 830                                               unsigned int generation)
 831 {
 832         struct hpsb_host *host = hi->host;
 833         struct node_entry *ne;
 834
 835         ne = kzalloc(sizeof(*ne), GFP_KERNEL);
 836         if (!ne)
 837                 goto fail_alloc;
 838
 839         ne->host = host;
 840         ne->nodeid = nodeid;
 841         ne->generation = generation;
 842         ne->needs_probe = 1;
 843
 844         ne->guid = guid;
 845         ne->guid_vendor_id = (guid >> 40) & 0xffffff;
 846         ne->csr = csr;
 847
 848         memcpy(&ne->device, &nodemgr_dev_template_ne,
 849                sizeof(ne->device));
 850         ne->device.parent = &host->device;
 851         snprintf(ne->device.bus_id, BUS_ID_SIZE, "%016Lx",
 852                  (unsigned long long)(ne->guid));
 853
 854         ne->class_dev.dev = &ne->device;
 855         ne->class_dev.class = &nodemgr_ne_class;
 856         snprintf(ne->class_dev.class_id, BUS_ID_SIZE, "%016Lx",
 857                  (unsigned long long)(ne->guid));
 858
 859         if (device_register(&ne->device))
 860                 goto fail_devreg;
 861         if (class_device_register(&ne->class_dev))
 862                 goto fail_classdevreg;
 863         get_device(&ne->device);
 864
 865         nodemgr_create_ne_dev_files(ne);
 866
 867         nodemgr_update_bus_options(ne);
 868
 869         HPSB_DEBUG("%s added: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 870                    (host->node_id == nodeid) ? "Host" : "Node",
 871                    NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
 872
 873         return ne;
 874
 875 fail_classdevreg:
 876         device_unregister(&ne->device);
 877 fail_devreg:
 878         kfree(ne);
 879 fail_alloc:
 880         HPSB_ERR("Failed to create node ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 881                  NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
 882
 883         return NULL;
 884 }
 885
 886
 887 static struct node_entry *find_entry_by_guid(u64 guid)
 888 {
 889         struct class_device *cdev;
 890         struct node_entry *ne, *ret_ne = NULL;
 891
 892         down(&nodemgr_ne_class.sem);
 893         list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
 894                 ne = container_of(cdev, struct node_entry, class_dev);
 895
 896                 if (ne->guid == guid) {
 897                         ret_ne = ne;
 898                         break;
 899                 }
 900         }
 901         up(&nodemgr_ne_class.sem);
 902
 903         return ret_ne;
 904 }
 905
 906
 907 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
 908                                                nodeid_t nodeid)
 909 {
 910         struct class_device *cdev;
 911         struct node_entry *ne, *ret_ne = NULL;
 912
 913         down(&nodemgr_ne_class.sem);
 914         list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
 915                 ne = container_of(cdev, struct node_entry, class_dev);
 916
 917                 if (ne->host == host && ne->nodeid == nodeid) {
 918                         ret_ne = ne;
 919                         break;
 920                 }
 921         }
 922         up(&nodemgr_ne_class.sem);
 923
 924         return ret_ne;
 925 }
 926
 927
 928 static void nodemgr_register_device(struct node_entry *ne,
 929         struct unit_directory *ud, struct device *parent)
 930 {
 931         memcpy(&ud->device, &nodemgr_dev_template_ud,
 932                sizeof(ud->device));
 933
 934         ud->device.parent = parent;
 935
 936         snprintf(ud->device.bus_id, BUS_ID_SIZE, "%s-%u",
 937                  ne->device.bus_id, ud->id);
 938
 939         ud->class_dev.dev = &ud->device;
 940         ud->class_dev.class = &nodemgr_ud_class;
 941         snprintf(ud->class_dev.class_id, BUS_ID_SIZE, "%s-%u",
 942                  ne->device.bus_id, ud->id);
 943
 944         if (device_register(&ud->device))
 945                 goto fail_devreg;
 946         if (class_device_register(&ud->class_dev))
 947                 goto fail_classdevreg;
 948         get_device(&ud->device);
 949
 950         nodemgr_create_ud_dev_files(ud);
 951
 952         return;
 953
 954 fail_classdevreg:
 955         device_unregister(&ud->device);
 956 fail_devreg:
 957         HPSB_ERR("Failed to create unit %s", ud->device.bus_id);
 958 }
 959
 960
 961 /* This implementation currently only scans the config rom and its
 962  * immediate unit directories looking for software_id and
 963  * software_version entries, in order to get driver autoloading working. */
 964 static struct unit_directory *nodemgr_process_unit_directory
 965         (struct host_info *hi, struct node_entry *ne, struct csr1212_keyval *ud_kv,
 966          unsigned int *id, struct unit_directory *parent)
 967 {
 968         struct unit_directory *ud;
 969         struct unit_directory *ud_child = NULL;
 970         struct csr1212_dentry *dentry;
 971         struct csr1212_keyval *kv;
 972         u8 last_key_id = 0;
 973
 974         ud = kzalloc(sizeof(*ud), GFP_KERNEL);
 975         if (!ud)
 976                 goto unit_directory_error;
 977
 978         ud->ne = ne;
 979         ud->ignore_driver = ignore_drivers;
 980         ud->address = ud_kv->offset + CSR1212_CONFIG_ROM_SPACE_BASE;
 981         ud->ud_kv = ud_kv;
 982         ud->id = (*id)++;
 983
 984         csr1212_for_each_dir_entry(ne->csr, kv, ud_kv, dentry) {
 985                 switch (kv->key.id) {
 986                 case CSR1212_KV_ID_VENDOR:
 987                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
 988                                 ud->vendor_id = kv->value.immediate;
 989                                 ud->flags |= UNIT_DIRECTORY_VENDOR_ID;
 990                         }
 991                         break;
 992
 993                 case CSR1212_KV_ID_MODEL:
 994                         ud->model_id = kv->value.immediate;
 995                         ud->flags |= UNIT_DIRECTORY_MODEL_ID;
 996                         break;
 997
 998                 case CSR1212_KV_ID_SPECIFIER_ID:
 999                         ud->specifier_id = kv->value.immediate;
1000                         ud->flags |= UNIT_DIRECTORY_SPECIFIER_ID;
1001                         break;
1002
1003                 case CSR1212_KV_ID_VERSION:
1004                         ud->version = kv->value.immediate;
1005                         ud->flags |= UNIT_DIRECTORY_VERSION;
1006                         break;
1007
1008                 case CSR1212_KV_ID_DESCRIPTOR:
1009                         if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1010                             CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1011                             CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1012                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1013                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1014                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1015                                 switch (last_key_id) {
1016                                 case CSR1212_KV_ID_VENDOR:
1017                                         ud->vendor_name_kv = kv;
1018                                         csr1212_keep_keyval(kv);
1019                                         break;
1020
1021                                 case CSR1212_KV_ID_MODEL:
1022                                         ud->model_name_kv = kv;
1023                                         csr1212_keep_keyval(kv);
1024                                         break;
1025
1026                                 }
1027                         } /* else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) ... */
1028                         break;
1029
1030                 case CSR1212_KV_ID_DEPENDENT_INFO:
1031                         /* Logical Unit Number */
1032                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
1033                                 if (ud->flags & UNIT_DIRECTORY_HAS_LUN) {
1034                                         ud_child = kmemdup(ud, sizeof(*ud_child), GFP_KERNEL);
1035                                         if (!ud_child)
1036                                                 goto unit_directory_error;
1037                                         nodemgr_register_device(ne, ud_child, &ne->device);
1038                                         ud_child = NULL;
1039
1040                                         ud->id = (*id)++;
1041                                 }
1042                                 ud->lun = kv->value.immediate;
1043                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN;
1044
1045                         /* Logical Unit Directory */
1046                         } else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) {
1047                                 /* This should really be done in SBP2 as this is
1048                                  * doing SBP2 specific parsing.
1049                                  */
1050
1051                                 /* first register the parent unit */
1052                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN_DIRECTORY;
1053                                 if (ud->device.bus != &ieee1394_bus_type)
1054                                         nodemgr_register_device(ne, ud, &ne->device);
1055
1056                                 /* process the child unit */
1057                                 ud_child = nodemgr_process_unit_directory(hi, ne, kv, id, ud);
1058
1059                                 if (ud_child == NULL)
1060                                         break;
1061
1062                                 /* inherit unspecified values, the driver core picks it up */
1063                                 if ((ud->flags & UNIT_DIRECTORY_MODEL_ID) &&
1064                                     !(ud_child->flags & UNIT_DIRECTORY_MODEL_ID))
1065                                 {
1066                                         ud_child->flags |=  UNIT_DIRECTORY_MODEL_ID;
1067                                         ud_child->model_id = ud->model_id;
1068                                 }
1069                                 if ((ud->flags & UNIT_DIRECTORY_SPECIFIER_ID) &&
1070                                     !(ud_child->flags & UNIT_DIRECTORY_SPECIFIER_ID))
1071                                 {
1072                                         ud_child->flags |=  UNIT_DIRECTORY_SPECIFIER_ID;
1073                                         ud_child->specifier_id = ud->specifier_id;
1074                                 }
1075                                 if ((ud->flags & UNIT_DIRECTORY_VERSION) &&
1076                                     !(ud_child->flags & UNIT_DIRECTORY_VERSION))
1077                                 {
1078                                         ud_child->flags |=  UNIT_DIRECTORY_VERSION;
1079                                         ud_child->version = ud->version;
1080                                 }
1081
1082                                 /* register the child unit */
1083                                 ud_child->flags |= UNIT_DIRECTORY_LUN_DIRECTORY;
1084                                 nodemgr_register_device(ne, ud_child, &ud->device);
1085                         }
1086
1087                         break;
1088
1089                 default:
1090                         break;
1091                 }
1092                 last_key_id = kv->key.id;
1093         }
1094
1095         /* do not process child units here and only if not already registered */
1096         if (!parent && ud->device.bus != &ieee1394_bus_type)
1097                 nodemgr_register_device(ne, ud, &ne->device);
1098
1099         return ud;
1100
1101 unit_directory_error:
1102         kfree(ud);
1103         return NULL;
1104 }
1105
1106
1107 static void nodemgr_process_root_directory(struct host_info *hi, struct node_entry *ne)
1108 {
1109         unsigned int ud_id = 0;
1110         struct csr1212_dentry *dentry;
1111         struct csr1212_keyval *kv;
1112         u8 last_key_id = 0;
1113
1114         ne->needs_probe = 0;
1115
1116         csr1212_for_each_dir_entry(ne->csr, kv, ne->csr->root_kv, dentry) {
1117                 switch (kv->key.id) {
1118                 case CSR1212_KV_ID_VENDOR:
1119                         ne->vendor_id = kv->value.immediate;
1120                         break;
1121
1122                 case CSR1212_KV_ID_NODE_CAPABILITIES:
1123                         ne->capabilities = kv->value.immediate;
1124                         break;
1125
1126                 case CSR1212_KV_ID_UNIT:
1127                         nodemgr_process_unit_directory(hi, ne, kv, &ud_id, NULL);
1128                         break;
1129
1130                 case CSR1212_KV_ID_DESCRIPTOR:
1131                         if (last_key_id == CSR1212_KV_ID_VENDOR) {
1132                                 if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1133                                     CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1134                                     CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1135                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1136                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1137                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1138                                         ne->vendor_name_kv = kv;
1139                                         csr1212_keep_keyval(kv);
1140                                 }
1141                         }
1142                         break;
1143                 }
1144                 last_key_id = kv->key.id;
1145         }
1146
1147         if (ne->vendor_name_kv &&
1148             device_create_file(&ne->device, &dev_attr_ne_vendor_name_kv))
1149                 goto fail;
1150         return;
1151 fail:
1152         HPSB_ERR("Failed to add sysfs attribute for node %016Lx",
1153                  (unsigned long long)ne->guid);
1154 }
1155
1156 #ifdef CONFIG_HOTPLUG
1157
1158 static int nodemgr_uevent(struct class_device *cdev, char **envp, int num_envp,
1159                           char *buffer, int buffer_size)
1160 {
1161         struct unit_directory *ud;
1162         int i = 0;
1163         int length = 0;
1164         int retval = 0;
1165         /* ieee1394:venNmoNspNverN */
1166         char buf[8 + 1 + 3 + 8 + 2 + 8 + 2 + 8 + 3 + 8 + 1];
1167
1168         if (!cdev)
1169                 return -ENODEV;
1170
1171         ud = container_of(cdev, struct unit_directory, class_dev);
1172
1173         if (ud->ne->in_limbo || ud->ignore_driver)
1174                 return -ENODEV;
1175
1176 #define PUT_ENVP(fmt,val)                                       \
1177 do {                                                            \
1178         retval = add_uevent_var(envp, num_envp, &i,             \
1179                                 buffer, buffer_size, &length,   \
1180                                 fmt, val);                      \
1181         if (retval)                                             \
1182                 return retval;                                  \
1183 } while (0)
1184
1185         PUT_ENVP("VENDOR_ID=%06x", ud->vendor_id);
1186         PUT_ENVP("MODEL_ID=%06x", ud->model_id);
1187         PUT_ENVP("GUID=%016Lx", (unsigned long long)ud->ne->guid);
1188         PUT_ENVP("SPECIFIER_ID=%06x", ud->specifier_id);
1189         PUT_ENVP("VERSION=%06x", ud->version);
1190         snprintf(buf, sizeof(buf), "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
1191                         ud->vendor_id,
1192                         ud->model_id,
1193                         ud->specifier_id,
1194                         ud->version);
1195         PUT_ENVP("MODALIAS=%s", buf);
1196
1197 #undef PUT_ENVP
1198
1199         envp[i] = NULL;
1200
1201         return 0;
1202 }
1203
1204 #else
1205
1206 static int nodemgr_uevent(struct class_device *cdev, char **envp, int num_envp,
1207                           char *buffer, int buffer_size)
1208 {
1209         return -ENODEV;
1210 }
1211
1212 #endif /* CONFIG_HOTPLUG */
1213
1214
1215 int __hpsb_register_protocol(struct hpsb_protocol_driver *drv,
1216                              struct module *owner)
1217 {
1218         int error;
1219
1220         drv->driver.bus = &ieee1394_bus_type;
1221         drv->driver.owner = owner;
1222         drv->driver.name = drv->name;
1223
1224         /* This will cause a probe for devices */
1225         error = driver_register(&drv->driver);
1226         if (!error)
1227                 nodemgr_create_drv_files(drv);
1228         return error;
1229 }
1230
1231 void hpsb_unregister_protocol(struct hpsb_protocol_driver *driver)
1232 {
1233         nodemgr_remove_drv_files(driver);
1234         /* This will subsequently disconnect all devices that our driver
1235          * is attached to. */
1236         driver_unregister(&driver->driver);
1237 }
1238
1239
1240 /*
1241  * This function updates nodes that were present on the bus before the
1242  * reset and still are after the reset.  The nodeid and the config rom
1243  * may have changed, and the drivers managing this device must be
1244  * informed that this device just went through a bus reset, to allow
1245  * the to take whatever actions required.
1246  */
1247 static void nodemgr_update_node(struct node_entry *ne, struct csr1212_csr *csr,
1248                                 struct host_info *hi, nodeid_t nodeid,
1249                                 unsigned int generation)
1250 {
1251         if (ne->nodeid != nodeid) {
1252                 HPSB_DEBUG("Node changed: " NODE_BUS_FMT " -> " NODE_BUS_FMT,
1253                            NODE_BUS_ARGS(ne->host, ne->nodeid),
1254                            NODE_BUS_ARGS(ne->host, nodeid));
1255                 ne->nodeid = nodeid;
1256         }
1257
1258         if (ne->busopt.generation != ((be32_to_cpu(csr->bus_info_data[2]) >> 4) & 0xf)) {
1259                 kfree(ne->csr->private);
1260                 csr1212_destroy_csr(ne->csr);
1261                 ne->csr = csr;
1262
1263                 /* If the node's configrom generation has changed, we
1264                  * unregister all the unit directories. */
1265                 nodemgr_remove_uds(ne);
1266
1267                 nodemgr_update_bus_options(ne);
1268
1269                 /* Mark the node as new, so it gets re-probed */
1270                 ne->needs_probe = 1;
1271         } else {
1272                 /* old cache is valid, so update its generation */
1273                 struct nodemgr_csr_info *ci = ne->csr->private;
1274                 ci->generation = generation;
1275                 /* free the partially filled now unneeded new cache */
1276                 kfree(csr->private);
1277                 csr1212_destroy_csr(csr);
1278         }
1279
1280         if (ne->in_limbo)
1281                 nodemgr_resume_ne(ne);
1282
1283         /* Mark the node current */
1284         ne->generation = generation;
1285 }
1286
1287
1288
1289 static void nodemgr_node_scan_one(struct host_info *hi,
1290                                   nodeid_t nodeid, int generation)
1291 {
1292         struct hpsb_host *host = hi->host;
1293         struct node_entry *ne;
1294         octlet_t guid;
1295         struct csr1212_csr *csr;
1296         struct nodemgr_csr_info *ci;
1297         u8 *speed;
1298
1299         ci = kmalloc(sizeof(*ci), GFP_KERNEL);
1300         if (!ci)
1301                 return;
1302
1303         ci->host = host;
1304         ci->nodeid = nodeid;
1305         ci->generation = generation;
1306
1307         /* Prepare for speed probe which occurs when reading the ROM */
1308         speed = &(host->speed[NODEID_TO_NODE(nodeid)]);
1309         if (*speed > host->csr.lnk_spd)
1310                 *speed = host->csr.lnk_spd;
1311         ci->speed_unverified = *speed > IEEE1394_SPEED_100;
1312
1313         /* We need to detect when the ConfigROM's generation has changed,
1314          * so we only update the node's info when it needs to be.  */
1315
1316         csr = csr1212_create_csr(&nodemgr_csr_ops, 5 * sizeof(quadlet_t), ci);
1317         if (!csr || csr1212_parse_csr(csr) != CSR1212_SUCCESS) {
1318                 HPSB_ERR("Error parsing configrom for node " NODE_BUS_FMT,
1319                          NODE_BUS_ARGS(host, nodeid));
1320                 if (csr)
1321                         csr1212_destroy_csr(csr);
1322                 kfree(ci);
1323                 return;
1324         }
1325
1326         if (csr->bus_info_data[1] != IEEE1394_BUSID_MAGIC) {
1327                 /* This isn't a 1394 device, but we let it slide. There
1328                  * was a report of a device with broken firmware which
1329                  * reported '2394' instead of '1394', which is obviously a
1330                  * mistake. One would hope that a non-1394 device never
1331                  * gets connected to Firewire bus. If someone does, we
1332                  * shouldn't be held responsible, so we'll allow it with a
1333                  * warning.  */
1334                 HPSB_WARN("Node " NODE_BUS_FMT " has invalid busID magic [0x%08x]",
1335                           NODE_BUS_ARGS(host, nodeid), csr->bus_info_data[1]);
1336         }
1337
1338         guid = ((u64)be32_to_cpu(csr->bus_info_data[3]) << 32) | be32_to_cpu(csr->bus_info_data[4]);
1339         ne = find_entry_by_guid(guid);
1340
1341         if (ne && ne->host != host && ne->in_limbo) {
1342                 /* Must have moved this device from one host to another */
1343                 nodemgr_remove_ne(ne);
1344                 ne = NULL;
1345         }
1346
1347         if (!ne)
1348                 nodemgr_create_node(guid, csr, hi, nodeid, generation);
1349         else
1350                 nodemgr_update_node(ne, csr, hi, nodeid, generation);
1351 }
1352
1353
1354 static void nodemgr_node_scan(struct host_info *hi, int generation)
1355 {
1356         int count;
1357         struct hpsb_host *host = hi->host;
1358         struct selfid *sid = (struct selfid *)host->topology_map;
1359         nodeid_t nodeid = LOCAL_BUS;
1360
1361         /* Scan each node on the bus */
1362         for (count = host->selfid_count; count; count--, sid++) {
1363                 if (sid->extended)
1364                         continue;
1365
1366                 if (!sid->link_active) {
1367                         nodeid++;
1368                         continue;
1369                 }
1370                 nodemgr_node_scan_one(hi, nodeid++, generation);
1371         }
1372 }
1373
1374
1375 static void nodemgr_suspend_ne(struct node_entry *ne)
1376 {
1377         struct class_device *cdev;
1378         struct unit_directory *ud;
1379
1380         HPSB_DEBUG("Node suspended: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1381                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1382
1383         ne->in_limbo = 1;
1384         WARN_ON(device_create_file(&ne->device, &dev_attr_ne_in_limbo));
1385
1386         down(&nodemgr_ud_class.sem);
1387         list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1388                 ud = container_of(cdev, struct unit_directory, class_dev);
1389                 if (ud->ne != ne)
1390                         continue;
1391
1392                 if (ud->device.driver &&
1393                     (!ud->device.driver->suspend ||
1394                       ud->device.driver->suspend(&ud->device, PMSG_SUSPEND)))
1395                         device_release_driver(&ud->device);
1396         }
1397         up(&nodemgr_ud_class.sem);
1398 }
1399
1400
1401 static void nodemgr_resume_ne(struct node_entry *ne)
1402 {
1403         struct class_device *cdev;
1404         struct unit_directory *ud;
1405
1406         ne->in_limbo = 0;
1407         device_remove_file(&ne->device, &dev_attr_ne_in_limbo);
1408
1409         down(&nodemgr_ud_class.sem);
1410         list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1411                 ud = container_of(cdev, struct unit_directory, class_dev);
1412                 if (ud->ne != ne)
1413                         continue;
1414
1415                 if (ud->device.driver && ud->device.driver->resume)
1416                         ud->device.driver->resume(&ud->device);
1417         }
1418         up(&nodemgr_ud_class.sem);
1419
1420         HPSB_DEBUG("Node resumed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1421                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1422 }
1423
1424
1425 static void nodemgr_update_pdrv(struct node_entry *ne)
1426 {
1427         struct unit_directory *ud;
1428         struct hpsb_protocol_driver *pdrv;
1429         struct class_device *cdev;
1430
1431         down(&nodemgr_ud_class.sem);
1432         list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1433                 ud = container_of(cdev, struct unit_directory, class_dev);
1434                 if (ud->ne != ne)
1435                         continue;
1436
1437                 if (ud->device.driver) {
1438                         pdrv = container_of(ud->device.driver,
1439                                             struct hpsb_protocol_driver,
1440                                             driver);
1441                         if (pdrv->update && pdrv->update(ud))
1442                                 device_release_driver(&ud->device);
1443                 }
1444         }
1445         up(&nodemgr_ud_class.sem);
1446 }
1447
1448
1449 /* Write the BROADCAST_CHANNEL as per IEEE1394a 8.3.2.3.11 and 8.4.2.3.  This
1450  * seems like an optional service but in the end it is practically mandatory
1451  * as a consequence of these clauses.
1452  *
1453  * Note that we cannot do a broadcast write to all nodes at once because some
1454  * pre-1394a devices would hang. */
1455 static void nodemgr_irm_write_bc(struct node_entry *ne, int generation)
1456 {
1457         const u64 bc_addr = (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL);
1458         quadlet_t bc_remote, bc_local;
1459         int error;
1460
1461         if (!ne->host->is_irm || ne->generation != generation ||
1462             ne->nodeid == ne->host->node_id)
1463                 return;
1464
1465         bc_local = cpu_to_be32(ne->host->csr.broadcast_channel);
1466
1467         /* Check if the register is implemented and 1394a compliant. */
1468         error = hpsb_read(ne->host, ne->nodeid, generation, bc_addr, &bc_remote,
1469                           sizeof(bc_remote));
1470         if (!error && bc_remote & cpu_to_be32(0x80000000) &&
1471             bc_remote != bc_local)
1472                 hpsb_node_write(ne, bc_addr, &bc_local, sizeof(bc_local));
1473 }
1474
1475
1476 static void nodemgr_probe_ne(struct host_info *hi, struct node_entry *ne, int generation)
1477 {
1478         struct device *dev;
1479
1480         if (ne->host != hi->host || ne->in_limbo)
1481                 return;
1482
1483         dev = get_device(&ne->device);
1484         if (!dev)
1485                 return;
1486
1487         nodemgr_irm_write_bc(ne, generation);
1488
1489         /* If "needs_probe", then this is either a new or changed node we
1490          * rescan totally. If the generation matches for an existing node
1491          * (one that existed prior to the bus reset) we send update calls
1492          * down to the drivers. Otherwise, this is a dead node and we
1493          * suspend it. */
1494         if (ne->needs_probe)
1495                 nodemgr_process_root_directory(hi, ne);
1496         else if (ne->generation == generation)
1497                 nodemgr_update_pdrv(ne);
1498         else
1499                 nodemgr_suspend_ne(ne);
1500
1501         put_device(dev);
1502 }
1503
1504
1505 static void nodemgr_node_probe(struct host_info *hi, int generation)
1506 {
1507         struct hpsb_host *host = hi->host;
1508         struct class_device *cdev;
1509         struct node_entry *ne;
1510
1511         /* Do some processing of the nodes we've probed. This pulls them
1512          * into the sysfs layer if needed, and can result in processing of
1513          * unit-directories, or just updating the node and it's
1514          * unit-directories.
1515          *
1516          * Run updates before probes. Usually, updates are time-critical
1517          * while probes are time-consuming. (Well, those probes need some
1518          * improvement...) */
1519
1520         down(&nodemgr_ne_class.sem);
1521         list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
1522                 ne = container_of(cdev, struct node_entry, class_dev);
1523                 if (!ne->needs_probe)
1524                         nodemgr_probe_ne(hi, ne, generation);
1525         }
1526         list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
1527                 ne = container_of(cdev, struct node_entry, class_dev);
1528                 if (ne->needs_probe)
1529                         nodemgr_probe_ne(hi, ne, generation);
1530         }
1531         up(&nodemgr_ne_class.sem);
1532
1533
1534         /* If we had a bus reset while we were scanning the bus, it is
1535          * possible that we did not probe all nodes.  In that case, we
1536          * skip the clean up for now, since we could remove nodes that
1537          * were still on the bus.  Another bus scan is pending which will
1538          * do the clean up eventually.
1539          *
1540          * Now let's tell the bus to rescan our devices. This may seem
1541          * like overhead, but the driver-model core will only scan a
1542          * device for a driver when either the device is added, or when a
1543          * new driver is added. A bus reset is a good reason to rescan
1544          * devices that were there before.  For example, an sbp2 device
1545          * may become available for login, if the host that held it was
1546          * just removed.  */
1547
1548         if (generation == get_hpsb_generation(host))
1549                 if (bus_rescan_devices(&ieee1394_bus_type))
1550                         HPSB_DEBUG("bus_rescan_devices had an error");
1551 }
1552
1553 static int nodemgr_send_resume_packet(struct hpsb_host *host)
1554 {
1555         struct hpsb_packet *packet;
1556         int error = -ENOMEM;
1557
1558         packet = hpsb_make_phypacket(host,
1559                         EXTPHYPACKET_TYPE_RESUME |
1560                         NODEID_TO_NODE(host->node_id) << PHYPACKET_PORT_SHIFT);
1561         if (packet) {
1562                 packet->no_waiter = 1;
1563                 packet->generation = get_hpsb_generation(host);
1564                 error = hpsb_send_packet(packet);
1565         }
1566         if (error)
1567                 HPSB_WARN("fw-host%d: Failed to broadcast resume packet",
1568                           host->id);
1569         return error;
1570 }
1571
1572 /* Perform a few high-level IRM responsibilities. */
1573 static int nodemgr_do_irm_duties(struct hpsb_host *host, int cycles)
1574 {
1575         quadlet_t bc;
1576
1577         /* if irm_id == -1 then there is no IRM on this bus */
1578         if (!host->is_irm || host->irm_id == (nodeid_t)-1)
1579                 return 1;
1580
1581         /* We are a 1394a-2000 compliant IRM. Set the validity bit. */
1582         host->csr.broadcast_channel |= 0x40000000;
1583
1584         /* If there is no bus manager then we should set the root node's
1585          * force_root bit to promote bus stability per the 1394
1586          * spec. (8.4.2.6) */
1587         if (host->busmgr_id == 0xffff && host->node_count > 1)
1588         {
1589                 u16 root_node = host->node_count - 1;
1590
1591                 /* get cycle master capability flag from root node */
1592                 if (host->is_cycmst ||
1593                     (!hpsb_read(host, LOCAL_BUS | root_node, get_hpsb_generation(host),
1594                                 (CSR_REGISTER_BASE + CSR_CONFIG_ROM + 2 * sizeof(quadlet_t)),
1595                                 &bc, sizeof(quadlet_t)) &&
1596                      be32_to_cpu(bc) & 1 << CSR_CMC_SHIFT))
1597                         hpsb_send_phy_config(host, root_node, -1);
1598                 else {
1599                         HPSB_DEBUG("The root node is not cycle master capable; "
1600                                    "selecting a new root node and resetting...");
1601
1602                         if (cycles >= 5) {
1603                                 /* Oh screw it! Just leave the bus as it is */
1604                                 HPSB_DEBUG("Stopping reset loop for IRM sanity");
1605                                 return 1;
1606                         }
1607
1608                         hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1609                         hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1610
1611                         return 0;
1612                 }
1613         }
1614
1615         /* Some devices suspend their ports while being connected to an inactive
1616          * host adapter, i.e. if connected before the low-level driver is
1617          * loaded.  They become visible either when physically unplugged and
1618          * replugged, or when receiving a resume packet.  Send one once. */
1619         if (!host->resume_packet_sent && !nodemgr_send_resume_packet(host))
1620                 host->resume_packet_sent = 1;
1621
1622         return 1;
1623 }
1624
1625 /* We need to ensure that if we are not the IRM, that the IRM node is capable of
1626  * everything we can do, otherwise issue a bus reset and try to become the IRM
1627  * ourselves. */
1628 static int nodemgr_check_irm_capability(struct hpsb_host *host, int cycles)
1629 {
1630         quadlet_t bc;
1631         int status;
1632
1633         if (hpsb_disable_irm || host->is_irm)
1634                 return 1;
1635
1636         status = hpsb_read(host, LOCAL_BUS | (host->irm_id),
1637                            get_hpsb_generation(host),
1638                            (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL),
1639                            &bc, sizeof(quadlet_t));
1640
1641         if (status < 0 || !(be32_to_cpu(bc) & 0x80000000)) {
1642                 /* The current irm node does not have a valid BROADCAST_CHANNEL
1643                  * register and we do, so reset the bus with force_root set */
1644                 HPSB_DEBUG("Current remote IRM is not 1394a-2000 compliant, resetting...");
1645
1646                 if (cycles >= 5) {
1647                         /* Oh screw it! Just leave the bus as it is */
1648                         HPSB_DEBUG("Stopping reset loop for IRM sanity");
1649                         return 1;
1650                 }
1651
1652                 hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1653                 hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1654
1655                 return 0;
1656         }
1657
1658         return 1;
1659 }
1660
1661 static int nodemgr_host_thread(void *__hi)
1662 {
1663         struct host_info *hi = (struct host_info *)__hi;
1664         struct hpsb_host *host = hi->host;
1665         unsigned int g, generation = 0;
1666         int i, reset_cycles = 0;
1667
1668         /* Setup our device-model entries */
1669         nodemgr_create_host_dev_files(host);
1670
1671         for (;;) {
1672                 /* Sleep until next bus reset */
1673                 set_current_state(TASK_INTERRUPTIBLE);
1674                 if (get_hpsb_generation(host) == generation &&
1675                     !kthread_should_stop())
1676                         schedule();
1677                 __set_current_state(TASK_RUNNING);
1678
1679                 /* Thread may have been woken up to freeze or to exit */
1680                 if (try_to_freeze())
1681                         continue;
1682                 if (kthread_should_stop())
1683                         goto exit;
1684
1685                 if (mutex_lock_interruptible(&nodemgr_serialize)) {
1686                         if (try_to_freeze())
1687                                 continue;
1688                         goto exit;
1689                 }
1690
1691                 /* Pause for 1/4 second in 1/16 second intervals,
1692                  * to make sure things settle down. */
1693                 g = get_hpsb_generation(host);
1694                 for (i = 0; i < 4 ; i++) {
1695                         if (msleep_interruptible(63) || kthread_should_stop())
1696                                 goto unlock_exit;
1697
1698                         /* Now get the generation in which the node ID's we collect
1699                          * are valid.  During the bus scan we will use this generation
1700                          * for the read transactions, so that if another reset occurs
1701                          * during the scan the transactions will fail instead of
1702                          * returning bogus data. */
1703                         generation = get_hpsb_generation(host);
1704
1705                         /* If we get a reset before we are done waiting, then
1706                          * start the the waiting over again */
1707                         if (generation != g)
1708                                 g = generation, i = 0;
1709                 }
1710
1711                 if (!nodemgr_check_irm_capability(host, reset_cycles) ||
1712                     !nodemgr_do_irm_duties(host, reset_cycles)) {
1713                         reset_cycles++;
1714                         mutex_unlock(&nodemgr_serialize);
1715                         continue;
1716                 }
1717                 reset_cycles = 0;
1718
1719                 /* Scan our nodes to get the bus options and create node
1720                  * entries. This does not do the sysfs stuff, since that
1721                  * would trigger uevents and such, which is a bad idea at
1722                  * this point. */
1723                 nodemgr_node_scan(hi, generation);
1724
1725                 /* This actually does the full probe, with sysfs
1726                  * registration. */
1727                 nodemgr_node_probe(hi, generation);
1728
1729                 /* Update some of our sysfs symlinks */
1730                 nodemgr_update_host_dev_links(host);
1731
1732                 mutex_unlock(&nodemgr_serialize);
1733         }
1734 unlock_exit:
1735         mutex_unlock(&nodemgr_serialize);
1736 exit:
1737         HPSB_VERBOSE("NodeMgr: Exiting thread");
1738         return 0;
1739 }
1740
1741 /**
1742  * nodemgr_for_each_host - call a function for each IEEE 1394 host
1743  * @data: an address to supply to the callback
1744  * @cb: function to call for each host
1745  *
1746  * Iterate the hosts, calling a given function with supplied data for each host.
1747  * If the callback fails on a host, i.e. if it returns a non-zero value, the
1748  * iteration is stopped.
1749  *
1750  * Return value: 0 on success, non-zero on failure (same as returned by last run
1751  * of the callback).
1752  */
1753 int nodemgr_for_each_host(void *data, int (*cb)(struct hpsb_host *, void *))
1754 {
1755         struct class_device *cdev;
1756         struct hpsb_host *host;
1757         int error = 0;
1758
1759         down(&hpsb_host_class.sem);
1760         list_for_each_entry(cdev, &hpsb_host_class.children, node) {
1761                 host = container_of(cdev, struct hpsb_host, class_dev);
1762
1763                 if ((error = cb(host, data)))
1764                         break;
1765         }
1766         up(&hpsb_host_class.sem);
1767
1768         return error;
1769 }
1770
1771 /* The following two convenience functions use a struct node_entry
1772  * for addressing a node on the bus.  They are intended for use by any
1773  * process context, not just the nodemgr thread, so we need to be a
1774  * little careful when reading out the node ID and generation.  The
1775  * thing that can go wrong is that we get the node ID, then a bus
1776  * reset occurs, and then we read the generation.  The node ID is
1777  * possibly invalid, but the generation is current, and we end up
1778  * sending a packet to a the wrong node.
1779  *
1780  * The solution is to make sure we read the generation first, so that
1781  * if a reset occurs in the process, we end up with a stale generation
1782  * and the transactions will fail instead of silently using wrong node
1783  * ID's.
1784  */
1785
1786 /**
1787  * hpsb_node_fill_packet - fill some destination information into a packet
1788  * @ne: destination node
1789  * @packet: packet to fill in
1790  *
1791  * This will fill in the given, pre-initialised hpsb_packet with the current
1792  * information from the node entry (host, node ID, bus generation number).
1793  */
1794 void hpsb_node_fill_packet(struct node_entry *ne, struct hpsb_packet *packet)
1795 {
1796         packet->host = ne->host;
1797         packet->generation = ne->generation;
1798         barrier();
1799         packet->node_id = ne->nodeid;
1800 }
1801
1802 int hpsb_node_write(struct node_entry *ne, u64 addr,
1803                     quadlet_t *buffer, size_t length)
1804 {
1805         unsigned int generation = ne->generation;
1806
1807         barrier();
1808         return hpsb_write(ne->host, ne->nodeid, generation,
1809                           addr, buffer, length);
1810 }
1811
1812 static void nodemgr_add_host(struct hpsb_host *host)
1813 {
1814         struct host_info *hi;
1815
1816         hi = hpsb_create_hostinfo(&nodemgr_highlevel, host, sizeof(*hi));
1817         if (!hi) {
1818                 HPSB_ERR("NodeMgr: out of memory in add host");
1819                 return;
1820         }
1821         hi->host = host;
1822         hi->thread = kthread_run(nodemgr_host_thread, hi, "knodemgrd_%d",
1823                                  host->id);
1824         if (IS_ERR(hi->thread)) {
1825                 HPSB_ERR("NodeMgr: cannot start thread for host %d", host->id);
1826                 hpsb_destroy_hostinfo(&nodemgr_highlevel, host);
1827         }
1828 }
1829
1830 static void nodemgr_host_reset(struct hpsb_host *host)
1831 {
1832         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1833
1834         if (hi) {
1835                 HPSB_VERBOSE("NodeMgr: Processing reset for host %d", host->id);
1836                 wake_up_process(hi->thread);
1837         }
1838 }
1839
1840 static void nodemgr_remove_host(struct hpsb_host *host)
1841 {
1842         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1843
1844         if (hi) {
1845                 kthread_stop(hi->thread);
1846                 nodemgr_remove_host_dev(&host->device);
1847         }
1848 }
1849
1850 static struct hpsb_highlevel nodemgr_highlevel = {
1851         .name =         "Node manager",
1852         .add_host =     nodemgr_add_host,
1853         .host_reset =   nodemgr_host_reset,
1854         .remove_host =  nodemgr_remove_host,
1855 };
1856
1857 int init_ieee1394_nodemgr(void)
1858 {
1859         int error;
1860
1861         error = class_register(&nodemgr_ne_class);
1862         if (error)
1863                 goto fail_ne;
1864         error = class_register(&nodemgr_ud_class);
1865         if (error)
1866                 goto fail_ud;
1867         error = driver_register(&nodemgr_mid_layer_driver);
1868         if (error)
1869                 goto fail_ml;
1870         /* This driver is not used if nodemgr is off (disable_nodemgr=1). */
1871         nodemgr_dev_template_host.driver = &nodemgr_mid_layer_driver;
1872
1873         hpsb_register_highlevel(&nodemgr_highlevel);
1874         return 0;
1875
1876 fail_ml:
1877         class_unregister(&nodemgr_ud_class);
1878 fail_ud:
1879         class_unregister(&nodemgr_ne_class);
1880 fail_ne:
1881         return error;
1882 }
1883
1884 void cleanup_ieee1394_nodemgr(void)
1885 {
1886         hpsb_unregister_highlevel(&nodemgr_highlevel);
1887         driver_unregister(&nodemgr_mid_layer_driver);
1888         class_unregister(&nodemgr_ud_class);
1889         class_unregister(&nodemgr_ne_class);
1890 }