err.no 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 <asm/atomic.h>
  22
  23 #include "csr.h"
  24 #include "highlevel.h"
  25 #include "hosts.h"
  26 #include "ieee1394.h"
  27 #include "ieee1394_core.h"
  28 #include "ieee1394_hotplug.h"
  29 #include "ieee1394_types.h"
  30 #include "ieee1394_transactions.h"
  31 #include "nodemgr.h"
  32
  33 static int ignore_drivers;
  34 module_param(ignore_drivers, int, S_IRUGO | S_IWUSR);
  35 MODULE_PARM_DESC(ignore_drivers, "Disable automatic probing for drivers.");
  36
  37 struct nodemgr_csr_info {
  38         struct hpsb_host *host;
  39         nodeid_t nodeid;
  40         unsigned int generation;
  41         unsigned int speed_unverified:1;
  42 };
  43
  44
  45 /*
  46  * Correct the speed map entry.  This is necessary
  47  *  - for nodes with link speed < phy speed,
  48  *  - for 1394b nodes with negotiated phy port speed < IEEE1394_SPEED_MAX.
  49  * A possible speed is determined by trial and error, using quadlet reads.
  50  */
  51 static int nodemgr_check_speed(struct nodemgr_csr_info *ci, u64 addr,
  52                                quadlet_t *buffer)
  53 {
  54         quadlet_t q;
  55         u8 i, *speed, old_speed, good_speed;
  56         int error;
  57
  58         speed = &(ci->host->speed[NODEID_TO_NODE(ci->nodeid)]);
  59         old_speed = *speed;
  60         good_speed = IEEE1394_SPEED_MAX + 1;
  61
  62         /* Try every speed from S100 to old_speed.
  63          * If we did it the other way around, a too low speed could be caught
  64          * if the retry succeeded for some other reason, e.g. because the link
  65          * just finished its initialization. */
  66         for (i = IEEE1394_SPEED_100; i <= old_speed; i++) {
  67                 *speed = i;
  68                 error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
  69                                   &q, sizeof(quadlet_t));
  70                 if (error)
  71                         break;
  72                 *buffer = q;
  73                 good_speed = i;
  74         }
  75         if (good_speed <= IEEE1394_SPEED_MAX) {
  76                 HPSB_DEBUG("Speed probe of node " NODE_BUS_FMT " yields %s",
  77                            NODE_BUS_ARGS(ci->host, ci->nodeid),
  78                            hpsb_speedto_str[good_speed]);
  79                 *speed = good_speed;
  80                 ci->speed_unverified = 0;
  81                 return 0;
  82         }
  83         *speed = old_speed;
  84         return error;
  85 }
  86
  87 static int nodemgr_bus_read(struct csr1212_csr *csr, u64 addr, u16 length,
  88                             void *buffer, void *__ci)
  89 {
  90         struct nodemgr_csr_info *ci = (struct nodemgr_csr_info*)__ci;
  91         int i, error;
  92
  93         for (i = 1; ; i++) {
  94                 error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
  95                                   buffer, length);
  96                 if (!error) {
  97                         ci->speed_unverified = 0;
  98                         break;
  99                 }
 100                 /* Give up after 3rd failure. */
 101                 if (i == 3)
 102                         break;
 103
 104                 /* The ieee1394_core guessed the node's speed capability from
 105                  * the self ID.  Check whether a lower speed works. */
 106                 if (ci->speed_unverified && length == sizeof(quadlet_t)) {
 107                         error = nodemgr_check_speed(ci, addr, buffer);
 108                         if (!error)
 109                                 break;
 110                 }
 111                 if (msleep_interruptible(334))
 112                         return -EINTR;
 113         }
 114         return error;
 115 }
 116
 117 static int nodemgr_get_max_rom(quadlet_t *bus_info_data, void *__ci)
 118 {
 119         return (be32_to_cpu(bus_info_data[2]) >> 8) & 0x3;
 120 }
 121
 122 static struct csr1212_bus_ops nodemgr_csr_ops = {
 123         .bus_read =     nodemgr_bus_read,
 124         .get_max_rom =  nodemgr_get_max_rom
 125 };
 126
 127
 128 /*
 129  * Basically what we do here is start off retrieving the bus_info block.
 130  * From there will fill in some info about the node, verify it is of IEEE
 131  * 1394 type, and that the crc checks out ok. After that we start off with
 132  * the root directory, and subdirectories. To do this, we retrieve the
 133  * quadlet header for a directory, find out the length, and retrieve the
 134  * complete directory entry (be it a leaf or a directory). We then process
 135  * it and add the info to our structure for that particular node.
 136  *
 137  * We verify CRC's along the way for each directory/block/leaf. The entire
 138  * node structure is generic, and simply stores the information in a way
 139  * that's easy to parse by the protocol interface.
 140  */
 141
 142 /*
 143  * The nodemgr relies heavily on the Driver Model for device callbacks and
 144  * driver/device mappings. The old nodemgr used to handle all this itself,
 145  * but now we are much simpler because of the LDM.
 146  */
 147
 148 static DEFINE_MUTEX(nodemgr_serialize);
 149
 150 struct host_info {
 151         struct hpsb_host *host;
 152         struct list_head list;
 153         struct task_struct *thread;
 154 };
 155
 156 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv);
 157 static int nodemgr_uevent(struct class_device *cdev, char **envp, int num_envp,
 158                           char *buffer, int buffer_size);
 159 static void nodemgr_resume_ne(struct node_entry *ne);
 160 static void nodemgr_remove_ne(struct node_entry *ne);
 161 static struct node_entry *find_entry_by_guid(u64 guid);
 162
 163 struct bus_type ieee1394_bus_type = {
 164         .name           = "ieee1394",
 165         .match          = nodemgr_bus_match,
 166 };
 167
 168 static void host_cls_release(struct class_device *class_dev)
 169 {
 170         put_device(&container_of((class_dev), struct hpsb_host, class_dev)->device);
 171 }
 172
 173 struct class hpsb_host_class = {
 174         .name           = "ieee1394_host",
 175         .release        = host_cls_release,
 176 };
 177
 178 static void ne_cls_release(struct class_device *class_dev)
 179 {
 180         put_device(&container_of((class_dev), struct node_entry, class_dev)->device);
 181 }
 182
 183 static struct class nodemgr_ne_class = {
 184         .name           = "ieee1394_node",
 185         .release        = ne_cls_release,
 186 };
 187
 188 static void ud_cls_release(struct class_device *class_dev)
 189 {
 190         put_device(&container_of((class_dev), struct unit_directory, class_dev)->device);
 191 }
 192
 193 /* The name here is only so that unit directory hotplug works with old
 194  * style hotplug, which only ever did unit directories anyway. */
 195 static struct class nodemgr_ud_class = {
 196         .name           = "ieee1394",
 197         .release        = ud_cls_release,
 198         .uevent         = nodemgr_uevent,
 199 };
 200
 201 static struct hpsb_highlevel nodemgr_highlevel;
 202
 203
 204 static void nodemgr_release_ud(struct device *dev)
 205 {
 206         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 207
 208         if (ud->vendor_name_kv)
 209                 csr1212_release_keyval(ud->vendor_name_kv);
 210         if (ud->model_name_kv)
 211                 csr1212_release_keyval(ud->model_name_kv);
 212
 213         kfree(ud);
 214 }
 215
 216 static void nodemgr_release_ne(struct device *dev)
 217 {
 218         struct node_entry *ne = container_of(dev, struct node_entry, device);
 219
 220         if (ne->vendor_name_kv)
 221                 csr1212_release_keyval(ne->vendor_name_kv);
 222
 223         kfree(ne);
 224 }
 225
 226
 227 static void nodemgr_release_host(struct device *dev)
 228 {
 229         struct hpsb_host *host = container_of(dev, struct hpsb_host, device);
 230
 231         csr1212_destroy_csr(host->csr.rom);
 232
 233         kfree(host);
 234 }
 235
 236 static int nodemgr_ud_platform_data;
 237
 238 static struct device nodemgr_dev_template_ud = {
 239         .bus            = &ieee1394_bus_type,
 240         .release        = nodemgr_release_ud,
 241         .platform_data  = &nodemgr_ud_platform_data,
 242 };
 243
 244 static struct device nodemgr_dev_template_ne = {
 245         .bus            = &ieee1394_bus_type,
 246         .release        = nodemgr_release_ne,
 247 };
 248
 249 /* This dummy driver prevents the host devices from being scanned. We have no
 250  * useful drivers for them yet, and there would be a deadlock possible if the
 251  * driver core scans the host device while the host's low-level driver (i.e.
 252  * the host's parent device) is being removed. */
 253 static struct device_driver nodemgr_mid_layer_driver = {
 254         .bus            = &ieee1394_bus_type,
 255         .name           = "nodemgr",
 256         .owner          = THIS_MODULE,
 257 };
 258
 259 struct device nodemgr_dev_template_host = {
 260         .bus            = &ieee1394_bus_type,
 261         .release        = nodemgr_release_host,
 262 };
 263
 264
 265 #define fw_attr(class, class_type, field, type, format_string)          \
 266 static ssize_t fw_show_##class##_##field (struct device *dev, struct device_attribute *attr, char *buf)\
 267 {                                                                       \
 268         class_type *class;                                              \
 269         class = container_of(dev, class_type, device);                  \
 270         return sprintf(buf, format_string, (type)class->field);         \
 271 }                                                                       \
 272 static struct device_attribute dev_attr_##class##_##field = {           \
 273         .attr = {.name = __stringify(field), .mode = S_IRUGO },         \
 274         .show   = fw_show_##class##_##field,                            \
 275 };
 276
 277 #define fw_attr_td(class, class_type, td_kv)                            \
 278 static ssize_t fw_show_##class##_##td_kv (struct device *dev, struct device_attribute *attr, char *buf)\
 279 {                                                                       \
 280         int len;                                                        \
 281         class_type *class = container_of(dev, class_type, device);      \
 282         len = (class->td_kv->value.leaf.len - 2) * sizeof(quadlet_t);   \
 283         memcpy(buf,                                                     \
 284                CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(class->td_kv),      \
 285                len);                                                    \
 286         while ((buf + len - 1) == '\0')                                 \
 287                 len--;                                                  \
 288         buf[len++] = '\n';                                              \
 289         buf[len] = '\0';                                                \
 290         return len;                                                     \
 291 }                                                                       \
 292 static struct device_attribute dev_attr_##class##_##td_kv = {           \
 293         .attr = {.name = __stringify(td_kv), .mode = S_IRUGO },         \
 294         .show   = fw_show_##class##_##td_kv,                            \
 295 };
 296
 297
 298 #define fw_drv_attr(field, type, format_string)                 \
 299 static ssize_t fw_drv_show_##field (struct device_driver *drv, char *buf) \
 300 {                                                               \
 301         struct hpsb_protocol_driver *driver;                    \
 302         driver = container_of(drv, struct hpsb_protocol_driver, driver); \
 303         return sprintf(buf, format_string, (type)driver->field);\
 304 }                                                               \
 305 static struct driver_attribute driver_attr_drv_##field = {      \
 306         .attr = {.name = __stringify(field), .mode = S_IRUGO }, \
 307         .show   = fw_drv_show_##field,                          \
 308 };
 309
 310
 311 static ssize_t fw_show_ne_bus_options(struct device *dev, struct device_attribute *attr, char *buf)
 312 {
 313         struct node_entry *ne = container_of(dev, struct node_entry, device);
 314
 315         return sprintf(buf, "IRMC(%d) CMC(%d) ISC(%d) BMC(%d) PMC(%d) GEN(%d) "
 316                        "LSPD(%d) MAX_REC(%d) MAX_ROM(%d) CYC_CLK_ACC(%d)\n",
 317                        ne->busopt.irmc,
 318                        ne->busopt.cmc, ne->busopt.isc, ne->busopt.bmc,
 319                        ne->busopt.pmc, ne->busopt.generation, ne->busopt.lnkspd,
 320                        ne->busopt.max_rec,
 321                        ne->busopt.max_rom,
 322                        ne->busopt.cyc_clk_acc);
 323 }
 324 static DEVICE_ATTR(bus_options,S_IRUGO,fw_show_ne_bus_options,NULL);
 325
 326
 327 #ifdef HPSB_DEBUG_TLABELS
 328 static ssize_t fw_show_ne_tlabels_free(struct device *dev,
 329                                        struct device_attribute *attr, char *buf)
 330 {
 331         struct node_entry *ne = container_of(dev, struct node_entry, device);
 332         unsigned long flags;
 333         unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
 334         int tf;
 335
 336         spin_lock_irqsave(&hpsb_tlabel_lock, flags);
 337         tf = 64 - bitmap_weight(tp, 64);
 338         spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
 339
 340         return sprintf(buf, "%d\n", tf);
 341 }
 342 static DEVICE_ATTR(tlabels_free,S_IRUGO,fw_show_ne_tlabels_free,NULL);
 343
 344
 345 static ssize_t fw_show_ne_tlabels_mask(struct device *dev,
 346                                        struct device_attribute *attr, char *buf)
 347 {
 348         struct node_entry *ne = container_of(dev, struct node_entry, device);
 349         unsigned long flags;
 350         unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
 351         u64 tm;
 352
 353         spin_lock_irqsave(&hpsb_tlabel_lock, flags);
 354 #if (BITS_PER_LONG <= 32)
 355         tm = ((u64)tp[0] << 32) + tp[1];
 356 #else
 357         tm = tp[0];
 358 #endif
 359         spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
 360
 361         return sprintf(buf, "0x%016llx\n", (unsigned long long)tm);
 362 }
 363 static DEVICE_ATTR(tlabels_mask, S_IRUGO, fw_show_ne_tlabels_mask, NULL);
 364 #endif /* HPSB_DEBUG_TLABELS */
 365
 366
 367 static ssize_t fw_set_ignore_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 368 {
 369         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 370         int state = simple_strtoul(buf, NULL, 10);
 371
 372         if (state == 1) {
 373                 ud->ignore_driver = 1;
 374                 device_release_driver(dev);
 375         } else if (state == 0)
 376                 ud->ignore_driver = 0;
 377
 378         return count;
 379 }
 380 static ssize_t fw_get_ignore_driver(struct device *dev, struct device_attribute *attr, char *buf)
 381 {
 382         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 383
 384         return sprintf(buf, "%d\n", ud->ignore_driver);
 385 }
 386 static DEVICE_ATTR(ignore_driver, S_IWUSR | S_IRUGO, fw_get_ignore_driver, fw_set_ignore_driver);
 387
 388
 389 static ssize_t fw_set_destroy_node(struct bus_type *bus, const char *buf, size_t count)
 390 {
 391         struct node_entry *ne;
 392         u64 guid = (u64)simple_strtoull(buf, NULL, 16);
 393
 394         ne = find_entry_by_guid(guid);
 395
 396         if (ne == NULL || !ne->in_limbo)
 397                 return -EINVAL;
 398
 399         nodemgr_remove_ne(ne);
 400
 401         return count;
 402 }
 403 static ssize_t fw_get_destroy_node(struct bus_type *bus, char *buf)
 404 {
 405         return sprintf(buf, "You can destroy in_limbo nodes by writing their GUID to this file\n");
 406 }
 407 static BUS_ATTR(destroy_node, S_IWUSR | S_IRUGO, fw_get_destroy_node, fw_set_destroy_node);
 408
 409
 410 static ssize_t fw_set_rescan(struct bus_type *bus, const char *buf,
 411                              size_t count)
 412 {
 413         int error = 0;
 414
 415         if (simple_strtoul(buf, NULL, 10) == 1)
 416                 error = bus_rescan_devices(&ieee1394_bus_type);
 417         return error ? error : count;
 418 }
 419 static ssize_t fw_get_rescan(struct bus_type *bus, char *buf)
 420 {
 421         return sprintf(buf, "You can force a rescan of the bus for "
 422                         "drivers by writing a 1 to this file\n");
 423 }
 424 static BUS_ATTR(rescan, S_IWUSR | S_IRUGO, fw_get_rescan, fw_set_rescan);
 425
 426
 427 static ssize_t fw_set_ignore_drivers(struct bus_type *bus, const char *buf, size_t count)
 428 {
 429         int state = simple_strtoul(buf, NULL, 10);
 430
 431         if (state == 1)
 432                 ignore_drivers = 1;
 433         else if (state == 0)
 434                 ignore_drivers = 0;
 435
 436         return count;
 437 }
 438 static ssize_t fw_get_ignore_drivers(struct bus_type *bus, char *buf)
 439 {
 440         return sprintf(buf, "%d\n", ignore_drivers);
 441 }
 442 static BUS_ATTR(ignore_drivers, S_IWUSR | S_IRUGO, fw_get_ignore_drivers, fw_set_ignore_drivers);
 443
 444
 445 struct bus_attribute *const fw_bus_attrs[] = {
 446         &bus_attr_destroy_node,
 447         &bus_attr_rescan,
 448         &bus_attr_ignore_drivers,
 449         NULL
 450 };
 451
 452
 453 fw_attr(ne, struct node_entry, capabilities, unsigned int, "0x%06x\n")
 454 fw_attr(ne, struct node_entry, nodeid, unsigned int, "0x%04x\n")
 455
 456 fw_attr(ne, struct node_entry, vendor_id, unsigned int, "0x%06x\n")
 457 fw_attr_td(ne, struct node_entry, vendor_name_kv)
 458
 459 fw_attr(ne, struct node_entry, guid, unsigned long long, "0x%016Lx\n")
 460 fw_attr(ne, struct node_entry, guid_vendor_id, unsigned int, "0x%06x\n")
 461 fw_attr(ne, struct node_entry, in_limbo, int, "%d\n");
 462
 463 static struct device_attribute *const fw_ne_attrs[] = {
 464         &dev_attr_ne_guid,
 465         &dev_attr_ne_guid_vendor_id,
 466         &dev_attr_ne_capabilities,
 467         &dev_attr_ne_vendor_id,
 468         &dev_attr_ne_nodeid,
 469         &dev_attr_bus_options,
 470 #ifdef HPSB_DEBUG_TLABELS
 471         &dev_attr_tlabels_free,
 472         &dev_attr_tlabels_mask,
 473 #endif
 474 };
 475
 476
 477
 478 fw_attr(ud, struct unit_directory, address, unsigned long long, "0x%016Lx\n")
 479 fw_attr(ud, struct unit_directory, length, int, "%d\n")
 480 /* These are all dependent on the value being provided */
 481 fw_attr(ud, struct unit_directory, vendor_id, unsigned int, "0x%06x\n")
 482 fw_attr(ud, struct unit_directory, model_id, unsigned int, "0x%06x\n")
 483 fw_attr(ud, struct unit_directory, specifier_id, unsigned int, "0x%06x\n")
 484 fw_attr(ud, struct unit_directory, version, unsigned int, "0x%06x\n")
 485 fw_attr_td(ud, struct unit_directory, vendor_name_kv)
 486 fw_attr_td(ud, struct unit_directory, model_name_kv)
 487
 488 static struct device_attribute *const fw_ud_attrs[] = {
 489         &dev_attr_ud_address,
 490         &dev_attr_ud_length,
 491         &dev_attr_ignore_driver,
 492 };
 493
 494
 495 fw_attr(host, struct hpsb_host, node_count, int, "%d\n")
 496 fw_attr(host, struct hpsb_host, selfid_count, int, "%d\n")
 497 fw_attr(host, struct hpsb_host, nodes_active, int, "%d\n")
 498 fw_attr(host, struct hpsb_host, in_bus_reset, int, "%d\n")
 499 fw_attr(host, struct hpsb_host, is_root, int, "%d\n")
 500 fw_attr(host, struct hpsb_host, is_cycmst, int, "%d\n")
 501 fw_attr(host, struct hpsb_host, is_irm, int, "%d\n")
 502 fw_attr(host, struct hpsb_host, is_busmgr, int, "%d\n")
 503
 504 static struct device_attribute *const fw_host_attrs[] = {
 505         &dev_attr_host_node_count,
 506         &dev_attr_host_selfid_count,
 507         &dev_attr_host_nodes_active,
 508         &dev_attr_host_in_bus_reset,
 509         &dev_attr_host_is_root,
 510         &dev_attr_host_is_cycmst,
 511         &dev_attr_host_is_irm,
 512         &dev_attr_host_is_busmgr,
 513 };
 514
 515
 516 static ssize_t fw_show_drv_device_ids(struct device_driver *drv, char *buf)
 517 {
 518         struct hpsb_protocol_driver *driver;
 519         struct ieee1394_device_id *id;
 520         int length = 0;
 521         char *scratch = buf;
 522
 523         driver = container_of(drv, struct hpsb_protocol_driver, driver);
 524
 525         for (id = driver->id_table; id->match_flags != 0; id++) {
 526                 int need_coma = 0;
 527
 528                 if (id->match_flags & IEEE1394_MATCH_VENDOR_ID) {
 529                         length += sprintf(scratch, "vendor_id=0x%06x", id->vendor_id);
 530                         scratch = buf + length;
 531                         need_coma++;
 532                 }
 533
 534                 if (id->match_flags & IEEE1394_MATCH_MODEL_ID) {
 535                         length += sprintf(scratch, "%smodel_id=0x%06x",
 536                                           need_coma++ ? "," : "",
 537                                           id->model_id);
 538                         scratch = buf + length;
 539                 }
 540
 541                 if (id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) {
 542                         length += sprintf(scratch, "%sspecifier_id=0x%06x",
 543                                           need_coma++ ? "," : "",
 544                                           id->specifier_id);
 545                         scratch = buf + length;
 546                 }
 547
 548                 if (id->match_flags & IEEE1394_MATCH_VERSION) {
 549                         length += sprintf(scratch, "%sversion=0x%06x",
 550                                           need_coma++ ? "," : "",
 551                                           id->version);
 552                         scratch = buf + length;
 553                 }
 554
 555                 if (need_coma) {
 556                         *scratch++ = '\n';
 557                         length++;
 558                 }
 559         }
 560
 561         return length;
 562 }
 563 static DRIVER_ATTR(device_ids,S_IRUGO,fw_show_drv_device_ids,NULL);
 564
 565
 566 fw_drv_attr(name, const char *, "%s\n")
 567
 568 static struct driver_attribute *const fw_drv_attrs[] = {
 569         &driver_attr_drv_name,
 570         &driver_attr_device_ids,
 571 };
 572
 573
 574 static void nodemgr_create_drv_files(struct hpsb_protocol_driver *driver)
 575 {
 576         struct device_driver *drv = &driver->driver;
 577         int i;
 578
 579         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
 580                 if (driver_create_file(drv, fw_drv_attrs[i]))
 581                         goto fail;
 582         return;
 583 fail:
 584         HPSB_ERR("Failed to add sysfs attribute for driver %s", driver->name);
 585 }
 586
 587
 588 static void nodemgr_remove_drv_files(struct hpsb_protocol_driver *driver)
 589 {
 590         struct device_driver *drv = &driver->driver;
 591         int i;
 592
 593         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
 594                 driver_remove_file(drv, fw_drv_attrs[i]);
 595 }
 596
 597
 598 static void nodemgr_create_ne_dev_files(struct node_entry *ne)
 599 {
 600         struct device *dev = &ne->device;
 601         int i;
 602
 603         for (i = 0; i < ARRAY_SIZE(fw_ne_attrs); i++)
 604                 if (device_create_file(dev, fw_ne_attrs[i]))
 605                         goto fail;
 606         return;
 607 fail:
 608         HPSB_ERR("Failed to add sysfs attribute for node %016Lx",
 609                  (unsigned long long)ne->guid);
 610 }
 611
 612
 613 static void nodemgr_create_host_dev_files(struct hpsb_host *host)
 614 {
 615         struct device *dev = &host->device;
 616         int i;
 617
 618         for (i = 0; i < ARRAY_SIZE(fw_host_attrs); i++)
 619                 if (device_create_file(dev, fw_host_attrs[i]))
 620                         goto fail;
 621         return;
 622 fail:
 623         HPSB_ERR("Failed to add sysfs attribute for host %d", host->id);
 624 }
 625
 626
 627 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
 628                                                nodeid_t nodeid);
 629
 630 static void nodemgr_update_host_dev_links(struct hpsb_host *host)
 631 {
 632         struct device *dev = &host->device;
 633         struct node_entry *ne;
 634
 635         sysfs_remove_link(&dev->kobj, "irm_id");
 636         sysfs_remove_link(&dev->kobj, "busmgr_id");
 637         sysfs_remove_link(&dev->kobj, "host_id");
 638
 639         if ((ne = find_entry_by_nodeid(host, host->irm_id)) &&
 640             sysfs_create_link(&dev->kobj, &ne->device.kobj, "irm_id"))
 641                 goto fail;
 642         if ((ne = find_entry_by_nodeid(host, host->busmgr_id)) &&
 643             sysfs_create_link(&dev->kobj, &ne->device.kobj, "busmgr_id"))
 644                 goto fail;
 645         if ((ne = find_entry_by_nodeid(host, host->node_id)) &&
 646             sysfs_create_link(&dev->kobj, &ne->device.kobj, "host_id"))
 647                 goto fail;
 648         return;
 649 fail:
 650         HPSB_ERR("Failed to update sysfs attributes for host %d", host->id);
 651 }
 652
 653 static void nodemgr_create_ud_dev_files(struct unit_directory *ud)
 654 {
 655         struct device *dev = &ud->device;
 656         int i;
 657
 658         for (i = 0; i < ARRAY_SIZE(fw_ud_attrs); i++)
 659                 if (device_create_file(dev, fw_ud_attrs[i]))
 660                         goto fail;
 661         if (ud->flags & UNIT_DIRECTORY_SPECIFIER_ID)
 662                 if (device_create_file(dev, &dev_attr_ud_specifier_id))
 663                         goto fail;
 664         if (ud->flags & UNIT_DIRECTORY_VERSION)
 665                 if (device_create_file(dev, &dev_attr_ud_version))
 666                         goto fail;
 667         if (ud->flags & UNIT_DIRECTORY_VENDOR_ID) {
 668                 if (device_create_file(dev, &dev_attr_ud_vendor_id))
 669                         goto fail;
 670                 if (ud->vendor_name_kv &&
 671                     device_create_file(dev, &dev_attr_ud_vendor_name_kv))
 672                         goto fail;
 673         }
 674         if (ud->flags & UNIT_DIRECTORY_MODEL_ID) {
 675                 if (device_create_file(dev, &dev_attr_ud_model_id))
 676                         goto fail;
 677                 if (ud->model_name_kv &&
 678                     device_create_file(dev, &dev_attr_ud_model_name_kv))
 679                         goto fail;
 680         }
 681         return;
 682 fail:
 683         HPSB_ERR("Failed to add sysfs attributes for unit %s",
 684                  ud->device.bus_id);
 685 }
 686
 687
 688 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv)
 689 {
 690         struct hpsb_protocol_driver *driver;
 691         struct unit_directory *ud;
 692         struct ieee1394_device_id *id;
 693
 694         /* We only match unit directories */
 695         if (dev->platform_data != &nodemgr_ud_platform_data)
 696                 return 0;
 697
 698         ud = container_of(dev, struct unit_directory, device);
 699         if (ud->ne->in_limbo || ud->ignore_driver)
 700                 return 0;
 701
 702         /* We only match drivers of type hpsb_protocol_driver */
 703         if (drv == &nodemgr_mid_layer_driver)
 704                 return 0;
 705
 706         driver = container_of(drv, struct hpsb_protocol_driver, driver);
 707         for (id = driver->id_table; id->match_flags != 0; id++) {
 708                 if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) &&
 709                     id->vendor_id != ud->vendor_id)
 710                         continue;
 711
 712                 if ((id->match_flags & IEEE1394_MATCH_MODEL_ID) &&
 713                     id->model_id != ud->model_id)
 714                         continue;
 715
 716                 if ((id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) &&
 717                     id->specifier_id != ud->specifier_id)
 718                         continue;
 719
 720                 if ((id->match_flags & IEEE1394_MATCH_VERSION) &&
 721                     id->version != ud->version)
 722                         continue;
 723
 724                 return 1;
 725         }
 726
 727         return 0;
 728 }
 729
 730
 731 static DEFINE_MUTEX(nodemgr_serialize_remove_uds);
 732
 733 static void nodemgr_remove_uds(struct node_entry *ne)
 734 {
 735         struct class_device *cdev;
 736         struct unit_directory *tmp, *ud;
 737
 738         /* Iteration over nodemgr_ud_class.children has to be protected by
 739          * nodemgr_ud_class.sem, but class_device_unregister() will eventually
 740          * take nodemgr_ud_class.sem too. Therefore pick out one ud at a time,
 741          * release the semaphore, and then unregister the ud. Since this code
 742          * may be called from other contexts besides the knodemgrds, protect the
 743          * gap after release of the semaphore by nodemgr_serialize_remove_uds.
 744          */
 745         mutex_lock(&nodemgr_serialize_remove_uds);
 746         for (;;) {
 747                 ud = NULL;
 748                 down(&nodemgr_ud_class.sem);
 749                 list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
 750                         tmp = container_of(cdev, struct unit_directory,
 751                                            class_dev);
 752                         if (tmp->ne == ne) {
 753                                 ud = tmp;
 754                                 break;
 755                         }
 756                 }
 757                 up(&nodemgr_ud_class.sem);
 758                 if (ud == NULL)
 759                         break;
 760                 class_device_unregister(&ud->class_dev);
 761                 device_unregister(&ud->device);
 762         }
 763         mutex_unlock(&nodemgr_serialize_remove_uds);
 764 }
 765
 766
 767 static void nodemgr_remove_ne(struct node_entry *ne)
 768 {
 769         struct device *dev;
 770
 771         dev = get_device(&ne->device);
 772         if (!dev)
 773                 return;
 774
 775         HPSB_DEBUG("Node removed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 776                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
 777
 778         nodemgr_remove_uds(ne);
 779
 780         class_device_unregister(&ne->class_dev);
 781         device_unregister(dev);
 782
 783         put_device(dev);
 784 }
 785
 786 static int __nodemgr_remove_host_dev(struct device *dev, void *data)
 787 {
 788         nodemgr_remove_ne(container_of(dev, struct node_entry, device));
 789         return 0;
 790 }
 791
 792 static void nodemgr_remove_host_dev(struct device *dev)
 793 {
 794         WARN_ON(device_for_each_child(dev, NULL, __nodemgr_remove_host_dev));
 795         sysfs_remove_link(&dev->kobj, "irm_id");
 796         sysfs_remove_link(&dev->kobj, "busmgr_id");
 797         sysfs_remove_link(&dev->kobj, "host_id");
 798 }
 799
 800
 801 static void nodemgr_update_bus_options(struct node_entry *ne)
 802 {
 803 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
 804         static const u16 mr[] = { 4, 64, 1024, 0};
 805 #endif
 806         quadlet_t busoptions = be32_to_cpu(ne->csr->bus_info_data[2]);
 807
 808         ne->busopt.irmc         = (busoptions >> 31) & 1;
 809         ne->busopt.cmc          = (busoptions >> 30) & 1;
 810         ne->busopt.isc          = (busoptions >> 29) & 1;
 811         ne->busopt.bmc          = (busoptions >> 28) & 1;
 812         ne->busopt.pmc          = (busoptions >> 27) & 1;
 813         ne->busopt.cyc_clk_acc  = (busoptions >> 16) & 0xff;
 814         ne->busopt.max_rec      = 1 << (((busoptions >> 12) & 0xf) + 1);
 815         ne->busopt.max_rom      = (busoptions >> 8) & 0x3;
 816         ne->busopt.generation   = (busoptions >> 4) & 0xf;
 817         ne->busopt.lnkspd       = busoptions & 0x7;
 818
 819         HPSB_VERBOSE("NodeMgr: raw=0x%08x irmc=%d cmc=%d isc=%d bmc=%d pmc=%d "
 820                      "cyc_clk_acc=%d max_rec=%d max_rom=%d gen=%d lspd=%d",
 821                      busoptions, ne->busopt.irmc, ne->busopt.cmc,
 822                      ne->busopt.isc, ne->busopt.bmc, ne->busopt.pmc,
 823                      ne->busopt.cyc_clk_acc, ne->busopt.max_rec,
 824                      mr[ne->busopt.max_rom],
 825                      ne->busopt.generation, ne->busopt.lnkspd);
 826 }
 827
 828
 829 static struct node_entry *nodemgr_create_node(octlet_t guid, struct csr1212_csr *csr,
 830                                               struct host_info *hi, nodeid_t nodeid,
 831                                               unsigned int generation)
 832 {
 833         struct hpsb_host *host = hi->host;
 834         struct node_entry *ne;
 835
 836         ne = kzalloc(sizeof(*ne), GFP_KERNEL);
 837         if (!ne)
 838                 goto fail_alloc;
 839
 840         ne->host = host;
 841         ne->nodeid = nodeid;
 842         ne->generation = generation;
 843         ne->needs_probe = 1;
 844
 845         ne->guid = guid;
 846         ne->guid_vendor_id = (guid >> 40) & 0xffffff;
 847         ne->csr = csr;
 848
 849         memcpy(&ne->device, &nodemgr_dev_template_ne,
 850                sizeof(ne->device));
 851         ne->device.parent = &host->device;
 852         snprintf(ne->device.bus_id, BUS_ID_SIZE, "%016Lx",
 853                  (unsigned long long)(ne->guid));
 854
 855         ne->class_dev.dev = &ne->device;
 856         ne->class_dev.class = &nodemgr_ne_class;
 857         snprintf(ne->class_dev.class_id, BUS_ID_SIZE, "%016Lx",
 858                  (unsigned long long)(ne->guid));
 859
 860         if (device_register(&ne->device))
 861                 goto fail_devreg;
 862         if (class_device_register(&ne->class_dev))
 863                 goto fail_classdevreg;
 864         get_device(&ne->device);
 865
 866         nodemgr_create_ne_dev_files(ne);
 867
 868         nodemgr_update_bus_options(ne);
 869
 870         HPSB_DEBUG("%s added: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 871                    (host->node_id == nodeid) ? "Host" : "Node",
 872                    NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
 873
 874         return ne;
 875
 876 fail_classdevreg:
 877         device_unregister(&ne->device);
 878 fail_devreg:
 879         kfree(ne);
 880 fail_alloc:
 881         HPSB_ERR("Failed to create node ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 882                  NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
 883
 884         return NULL;
 885 }
 886
 887
 888 static struct node_entry *find_entry_by_guid(u64 guid)
 889 {
 890         struct class_device *cdev;
 891         struct node_entry *ne, *ret_ne = NULL;
 892
 893         down(&nodemgr_ne_class.sem);
 894         list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
 895                 ne = container_of(cdev, struct node_entry, class_dev);
 896
 897                 if (ne->guid == guid) {
 898                         ret_ne = ne;
 899                         break;
 900                 }
 901         }
 902         up(&nodemgr_ne_class.sem);
 903
 904         return ret_ne;
 905 }
 906
 907
 908 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
 909                                                nodeid_t nodeid)
 910 {
 911         struct class_device *cdev;
 912         struct node_entry *ne, *ret_ne = NULL;
 913
 914         down(&nodemgr_ne_class.sem);
 915         list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
 916                 ne = container_of(cdev, struct node_entry, class_dev);
 917
 918                 if (ne->host == host && ne->nodeid == nodeid) {
 919                         ret_ne = ne;
 920                         break;
 921                 }
 922         }
 923         up(&nodemgr_ne_class.sem);
 924
 925         return ret_ne;
 926 }
 927
 928
 929 static void nodemgr_register_device(struct node_entry *ne,
 930         struct unit_directory *ud, struct device *parent)
 931 {
 932         memcpy(&ud->device, &nodemgr_dev_template_ud,
 933                sizeof(ud->device));
 934
 935         ud->device.parent = parent;
 936
 937         snprintf(ud->device.bus_id, BUS_ID_SIZE, "%s-%u",
 938                  ne->device.bus_id, ud->id);
 939
 940         ud->class_dev.dev = &ud->device;
 941         ud->class_dev.class = &nodemgr_ud_class;
 942         snprintf(ud->class_dev.class_id, BUS_ID_SIZE, "%s-%u",
 943                  ne->device.bus_id, ud->id);
 944
 945         if (device_register(&ud->device))
 946                 goto fail_devreg;
 947         if (class_device_register(&ud->class_dev))
 948                 goto fail_classdevreg;
 949         get_device(&ud->device);
 950
 951         nodemgr_create_ud_dev_files(ud);
 952
 953         return;
 954
 955 fail_classdevreg:
 956         device_unregister(&ud->device);
 957 fail_devreg:
 958         HPSB_ERR("Failed to create unit %s", ud->device.bus_id);
 959 }
 960
 961
 962 /* This implementation currently only scans the config rom and its
 963  * immediate unit directories looking for software_id and
 964  * software_version entries, in order to get driver autoloading working. */
 965 static struct unit_directory *nodemgr_process_unit_directory
 966         (struct host_info *hi, struct node_entry *ne, struct csr1212_keyval *ud_kv,
 967          unsigned int *id, struct unit_directory *parent)
 968 {
 969         struct unit_directory *ud;
 970         struct unit_directory *ud_child = NULL;
 971         struct csr1212_dentry *dentry;
 972         struct csr1212_keyval *kv;
 973         u8 last_key_id = 0;
 974
 975         ud = kzalloc(sizeof(*ud), GFP_KERNEL);
 976         if (!ud)
 977                 goto unit_directory_error;
 978
 979         ud->ne = ne;
 980         ud->ignore_driver = ignore_drivers;
 981         ud->address = ud_kv->offset + CSR1212_CONFIG_ROM_SPACE_BASE;
 982         ud->ud_kv = ud_kv;
 983         ud->id = (*id)++;
 984
 985         csr1212_for_each_dir_entry(ne->csr, kv, ud_kv, dentry) {
 986                 switch (kv->key.id) {
 987                 case CSR1212_KV_ID_VENDOR:
 988                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
 989                                 ud->vendor_id = kv->value.immediate;
 990                                 ud->flags |= UNIT_DIRECTORY_VENDOR_ID;
 991                         }
 992                         break;
 993
 994                 case CSR1212_KV_ID_MODEL:
 995                         ud->model_id = kv->value.immediate;
 996                         ud->flags |= UNIT_DIRECTORY_MODEL_ID;
 997                         break;
 998
 999                 case CSR1212_KV_ID_SPECIFIER_ID:
1000                         ud->specifier_id = kv->value.immediate;
1001                         ud->flags |= UNIT_DIRECTORY_SPECIFIER_ID;
1002                         break;
1003
1004                 case CSR1212_KV_ID_VERSION:
1005                         ud->version = kv->value.immediate;
1006                         ud->flags |= UNIT_DIRECTORY_VERSION;
1007                         break;
1008
1009                 case CSR1212_KV_ID_DESCRIPTOR:
1010                         if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1011                             CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1012                             CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1013                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1014                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1015                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1016                                 switch (last_key_id) {
1017                                 case CSR1212_KV_ID_VENDOR:
1018                                         ud->vendor_name_kv = kv;
1019                                         csr1212_keep_keyval(kv);
1020                                         break;
1021
1022                                 case CSR1212_KV_ID_MODEL:
1023                                         ud->model_name_kv = kv;
1024                                         csr1212_keep_keyval(kv);
1025                                         break;
1026
1027                                 }
1028                         } /* else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) ... */
1029                         break;
1030
1031                 case CSR1212_KV_ID_DEPENDENT_INFO:
1032                         /* Logical Unit Number */
1033                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
1034                                 if (ud->flags & UNIT_DIRECTORY_HAS_LUN) {
1035                                         ud_child = kmemdup(ud, sizeof(*ud_child), GFP_KERNEL);
1036                                         if (!ud_child)
1037                                                 goto unit_directory_error;
1038                                         nodemgr_register_device(ne, ud_child, &ne->device);
1039                                         ud_child = NULL;
1040
1041                                         ud->id = (*id)++;
1042                                 }
1043                                 ud->lun = kv->value.immediate;
1044                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN;
1045
1046                         /* Logical Unit Directory */
1047                         } else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) {
1048                                 /* This should really be done in SBP2 as this is
1049                                  * doing SBP2 specific parsing.
1050                                  */
1051
1052                                 /* first register the parent unit */
1053                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN_DIRECTORY;
1054                                 if (ud->device.bus != &ieee1394_bus_type)
1055                                         nodemgr_register_device(ne, ud, &ne->device);
1056
1057                                 /* process the child unit */
1058                                 ud_child = nodemgr_process_unit_directory(hi, ne, kv, id, ud);
1059
1060                                 if (ud_child == NULL)
1061                                         break;
1062
1063                                 /* inherit unspecified values, the driver core picks it up */
1064                                 if ((ud->flags & UNIT_DIRECTORY_MODEL_ID) &&
1065                                     !(ud_child->flags & UNIT_DIRECTORY_MODEL_ID))
1066                                 {
1067                                         ud_child->flags |=  UNIT_DIRECTORY_MODEL_ID;
1068                                         ud_child->model_id = ud->model_id;
1069                                 }
1070                                 if ((ud->flags & UNIT_DIRECTORY_SPECIFIER_ID) &&
1071                                     !(ud_child->flags & UNIT_DIRECTORY_SPECIFIER_ID))
1072                                 {
1073                                         ud_child->flags |=  UNIT_DIRECTORY_SPECIFIER_ID;
1074                                         ud_child->specifier_id = ud->specifier_id;
1075                                 }
1076                                 if ((ud->flags & UNIT_DIRECTORY_VERSION) &&
1077                                     !(ud_child->flags & UNIT_DIRECTORY_VERSION))
1078                                 {
1079                                         ud_child->flags |=  UNIT_DIRECTORY_VERSION;
1080                                         ud_child->version = ud->version;
1081                                 }
1082
1083                                 /* register the child unit */
1084                                 ud_child->flags |= UNIT_DIRECTORY_LUN_DIRECTORY;
1085                                 nodemgr_register_device(ne, ud_child, &ud->device);
1086                         }
1087
1088                         break;
1089
1090                 default:
1091                         break;
1092                 }
1093                 last_key_id = kv->key.id;
1094         }
1095
1096         /* do not process child units here and only if not already registered */
1097         if (!parent && ud->device.bus != &ieee1394_bus_type)
1098                 nodemgr_register_device(ne, ud, &ne->device);
1099
1100         return ud;
1101
1102 unit_directory_error:
1103         kfree(ud);
1104         return NULL;
1105 }
1106
1107
1108 static void nodemgr_process_root_directory(struct host_info *hi, struct node_entry *ne)
1109 {
1110         unsigned int ud_id = 0;
1111         struct csr1212_dentry *dentry;
1112         struct csr1212_keyval *kv;
1113         u8 last_key_id = 0;
1114
1115         ne->needs_probe = 0;
1116
1117         csr1212_for_each_dir_entry(ne->csr, kv, ne->csr->root_kv, dentry) {
1118                 switch (kv->key.id) {
1119                 case CSR1212_KV_ID_VENDOR:
1120                         ne->vendor_id = kv->value.immediate;
1121                         break;
1122
1123                 case CSR1212_KV_ID_NODE_CAPABILITIES:
1124                         ne->capabilities = kv->value.immediate;
1125                         break;
1126
1127                 case CSR1212_KV_ID_UNIT:
1128                         nodemgr_process_unit_directory(hi, ne, kv, &ud_id, NULL);
1129                         break;
1130
1131                 case CSR1212_KV_ID_DESCRIPTOR:
1132                         if (last_key_id == CSR1212_KV_ID_VENDOR) {
1133                                 if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1134                                     CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1135                                     CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1136                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1137                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1138                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1139                                         ne->vendor_name_kv = kv;
1140                                         csr1212_keep_keyval(kv);
1141                                 }
1142                         }
1143                         break;
1144                 }
1145                 last_key_id = kv->key.id;
1146         }
1147
1148         if (ne->vendor_name_kv) {
1149                 int error = device_create_file(&ne->device,
1150                                                &dev_attr_ne_vendor_name_kv);
1151
1152                 if (error && error != -EEXIST)
1153                         HPSB_ERR("Failed to add sysfs attribute for node "
1154                                  "%016Lx", (unsigned long long)ne->guid);
1155         }
1156 }
1157
1158 #ifdef CONFIG_HOTPLUG
1159
1160 static int nodemgr_uevent(struct class_device *cdev, char **envp, int num_envp,
1161                           char *buffer, int buffer_size)
1162 {
1163         struct unit_directory *ud;
1164         int i = 0;
1165         int length = 0;
1166         int retval = 0;
1167         /* ieee1394:venNmoNspNverN */
1168         char buf[8 + 1 + 3 + 8 + 2 + 8 + 2 + 8 + 3 + 8 + 1];
1169
1170         if (!cdev)
1171                 return -ENODEV;
1172
1173         ud = container_of(cdev, struct unit_directory, class_dev);
1174
1175         if (ud->ne->in_limbo || ud->ignore_driver)
1176                 return -ENODEV;
1177
1178 #define PUT_ENVP(fmt,val)                                       \
1179 do {                                                            \
1180         retval = add_uevent_var(envp, num_envp, &i,             \
1181                                 buffer, buffer_size, &length,   \
1182                                 fmt, val);                      \
1183         if (retval)                                             \
1184                 return retval;                                  \
1185 } while (0)
1186
1187         PUT_ENVP("VENDOR_ID=%06x", ud->vendor_id);
1188         PUT_ENVP("MODEL_ID=%06x", ud->model_id);
1189         PUT_ENVP("GUID=%016Lx", (unsigned long long)ud->ne->guid);
1190         PUT_ENVP("SPECIFIER_ID=%06x", ud->specifier_id);
1191         PUT_ENVP("VERSION=%06x", ud->version);
1192         snprintf(buf, sizeof(buf), "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
1193                         ud->vendor_id,
1194                         ud->model_id,
1195                         ud->specifier_id,
1196                         ud->version);
1197         PUT_ENVP("MODALIAS=%s", buf);
1198
1199 #undef PUT_ENVP
1200
1201         envp[i] = NULL;
1202
1203         return 0;
1204 }
1205
1206 #else
1207
1208 static int nodemgr_uevent(struct class_device *cdev, char **envp, int num_envp,
1209                           char *buffer, int buffer_size)
1210 {
1211         return -ENODEV;
1212 }
1213
1214 #endif /* CONFIG_HOTPLUG */
1215
1216
1217 int __hpsb_register_protocol(struct hpsb_protocol_driver *drv,
1218                              struct module *owner)
1219 {
1220         int error;
1221
1222         drv->driver.bus = &ieee1394_bus_type;
1223         drv->driver.owner = owner;
1224         drv->driver.name = drv->name;
1225
1226         /* This will cause a probe for devices */
1227         error = driver_register(&drv->driver);
1228         if (!error)
1229                 nodemgr_create_drv_files(drv);
1230         return error;
1231 }
1232
1233 void hpsb_unregister_protocol(struct hpsb_protocol_driver *driver)
1234 {
1235         nodemgr_remove_drv_files(driver);
1236         /* This will subsequently disconnect all devices that our driver
1237          * is attached to. */
1238         driver_unregister(&driver->driver);
1239 }
1240
1241
1242 /*
1243  * This function updates nodes that were present on the bus before the
1244  * reset and still are after the reset.  The nodeid and the config rom
1245  * may have changed, and the drivers managing this device must be
1246  * informed that this device just went through a bus reset, to allow
1247  * the to take whatever actions required.
1248  */
1249 static void nodemgr_update_node(struct node_entry *ne, struct csr1212_csr *csr,
1250                                 struct host_info *hi, nodeid_t nodeid,
1251                                 unsigned int generation)
1252 {
1253         if (ne->nodeid != nodeid) {
1254                 HPSB_DEBUG("Node changed: " NODE_BUS_FMT " -> " NODE_BUS_FMT,
1255                            NODE_BUS_ARGS(ne->host, ne->nodeid),
1256                            NODE_BUS_ARGS(ne->host, nodeid));
1257                 ne->nodeid = nodeid;
1258         }
1259
1260         if (ne->busopt.generation != ((be32_to_cpu(csr->bus_info_data[2]) >> 4) & 0xf)) {
1261                 kfree(ne->csr->private);
1262                 csr1212_destroy_csr(ne->csr);
1263                 ne->csr = csr;
1264
1265                 /* If the node's configrom generation has changed, we
1266                  * unregister all the unit directories. */
1267                 nodemgr_remove_uds(ne);
1268
1269                 nodemgr_update_bus_options(ne);
1270
1271                 /* Mark the node as new, so it gets re-probed */
1272                 ne->needs_probe = 1;
1273         } else {
1274                 /* old cache is valid, so update its generation */
1275                 struct nodemgr_csr_info *ci = ne->csr->private;
1276                 ci->generation = generation;
1277                 /* free the partially filled now unneeded new cache */
1278                 kfree(csr->private);
1279                 csr1212_destroy_csr(csr);
1280         }
1281
1282         if (ne->in_limbo)
1283                 nodemgr_resume_ne(ne);
1284
1285         /* Mark the node current */
1286         ne->generation = generation;
1287 }
1288
1289
1290
1291 static void nodemgr_node_scan_one(struct host_info *hi,
1292                                   nodeid_t nodeid, int generation)
1293 {
1294         struct hpsb_host *host = hi->host;
1295         struct node_entry *ne;
1296         octlet_t guid;
1297         struct csr1212_csr *csr;
1298         struct nodemgr_csr_info *ci;
1299         u8 *speed;
1300
1301         ci = kmalloc(sizeof(*ci), GFP_KERNEL);
1302         if (!ci)
1303                 return;
1304
1305         ci->host = host;
1306         ci->nodeid = nodeid;
1307         ci->generation = generation;
1308
1309         /* Prepare for speed probe which occurs when reading the ROM */
1310         speed = &(host->speed[NODEID_TO_NODE(nodeid)]);
1311         if (*speed > host->csr.lnk_spd)
1312                 *speed = host->csr.lnk_spd;
1313         ci->speed_unverified = *speed > IEEE1394_SPEED_100;
1314
1315         /* We need to detect when the ConfigROM's generation has changed,
1316          * so we only update the node's info when it needs to be.  */
1317
1318         csr = csr1212_create_csr(&nodemgr_csr_ops, 5 * sizeof(quadlet_t), ci);
1319         if (!csr || csr1212_parse_csr(csr) != CSR1212_SUCCESS) {
1320                 HPSB_ERR("Error parsing configrom for node " NODE_BUS_FMT,
1321                          NODE_BUS_ARGS(host, nodeid));
1322                 if (csr)
1323                         csr1212_destroy_csr(csr);
1324                 kfree(ci);
1325                 return;
1326         }
1327
1328         if (csr->bus_info_data[1] != IEEE1394_BUSID_MAGIC) {
1329                 /* This isn't a 1394 device, but we let it slide. There
1330                  * was a report of a device with broken firmware which
1331                  * reported '2394' instead of '1394', which is obviously a
1332                  * mistake. One would hope that a non-1394 device never
1333                  * gets connected to Firewire bus. If someone does, we
1334                  * shouldn't be held responsible, so we'll allow it with a
1335                  * warning.  */
1336                 HPSB_WARN("Node " NODE_BUS_FMT " has invalid busID magic [0x%08x]",
1337                           NODE_BUS_ARGS(host, nodeid), csr->bus_info_data[1]);
1338         }
1339
1340         guid = ((u64)be32_to_cpu(csr->bus_info_data[3]) << 32) | be32_to_cpu(csr->bus_info_data[4]);
1341         ne = find_entry_by_guid(guid);
1342
1343         if (ne && ne->host != host && ne->in_limbo) {
1344                 /* Must have moved this device from one host to another */
1345                 nodemgr_remove_ne(ne);
1346                 ne = NULL;
1347         }
1348
1349         if (!ne)
1350                 nodemgr_create_node(guid, csr, hi, nodeid, generation);
1351         else
1352                 nodemgr_update_node(ne, csr, hi, nodeid, generation);
1353 }
1354
1355
1356 static void nodemgr_node_scan(struct host_info *hi, int generation)
1357 {
1358         int count;
1359         struct hpsb_host *host = hi->host;
1360         struct selfid *sid = (struct selfid *)host->topology_map;
1361         nodeid_t nodeid = LOCAL_BUS;
1362
1363         /* Scan each node on the bus */
1364         for (count = host->selfid_count; count; count--, sid++) {
1365                 if (sid->extended)
1366                         continue;
1367
1368                 if (!sid->link_active) {
1369                         nodeid++;
1370                         continue;
1371                 }
1372                 nodemgr_node_scan_one(hi, nodeid++, generation);
1373         }
1374 }
1375
1376
1377 static void nodemgr_suspend_ne(struct node_entry *ne)
1378 {
1379         struct class_device *cdev;
1380         struct unit_directory *ud;
1381
1382         HPSB_DEBUG("Node suspended: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1383                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1384
1385         ne->in_limbo = 1;
1386         WARN_ON(device_create_file(&ne->device, &dev_attr_ne_in_limbo));
1387
1388         down(&nodemgr_ud_class.sem);
1389         list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1390                 ud = container_of(cdev, struct unit_directory, class_dev);
1391                 if (ud->ne != ne)
1392                         continue;
1393
1394                 if (ud->device.driver &&
1395                     (!ud->device.driver->suspend ||
1396                       ud->device.driver->suspend(&ud->device, PMSG_SUSPEND)))
1397                         device_release_driver(&ud->device);
1398         }
1399         up(&nodemgr_ud_class.sem);
1400 }
1401
1402
1403 static void nodemgr_resume_ne(struct node_entry *ne)
1404 {
1405         struct class_device *cdev;
1406         struct unit_directory *ud;
1407
1408         ne->in_limbo = 0;
1409         device_remove_file(&ne->device, &dev_attr_ne_in_limbo);
1410
1411         down(&nodemgr_ud_class.sem);
1412         list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1413                 ud = container_of(cdev, struct unit_directory, class_dev);
1414                 if (ud->ne != ne)
1415                         continue;
1416
1417                 if (ud->device.driver && ud->device.driver->resume)
1418                         ud->device.driver->resume(&ud->device);
1419         }
1420         up(&nodemgr_ud_class.sem);
1421
1422         HPSB_DEBUG("Node resumed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1423                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1424 }
1425
1426
1427 static void nodemgr_update_pdrv(struct node_entry *ne)
1428 {
1429         struct unit_directory *ud;
1430         struct hpsb_protocol_driver *pdrv;
1431         struct class_device *cdev;
1432
1433         down(&nodemgr_ud_class.sem);
1434         list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1435                 ud = container_of(cdev, struct unit_directory, class_dev);
1436                 if (ud->ne != ne)
1437                         continue;
1438
1439                 if (ud->device.driver) {
1440                         pdrv = container_of(ud->device.driver,
1441                                             struct hpsb_protocol_driver,
1442                                             driver);
1443                         if (pdrv->update && pdrv->update(ud))
1444                                 device_release_driver(&ud->device);
1445                 }
1446         }
1447         up(&nodemgr_ud_class.sem);
1448 }
1449
1450
1451 /* Write the BROADCAST_CHANNEL as per IEEE1394a 8.3.2.3.11 and 8.4.2.3.  This
1452  * seems like an optional service but in the end it is practically mandatory
1453  * as a consequence of these clauses.
1454  *
1455  * Note that we cannot do a broadcast write to all nodes at once because some
1456  * pre-1394a devices would hang. */
1457 static void nodemgr_irm_write_bc(struct node_entry *ne, int generation)
1458 {
1459         const u64 bc_addr = (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL);
1460         quadlet_t bc_remote, bc_local;
1461         int error;
1462
1463         if (!ne->host->is_irm || ne->generation != generation ||
1464             ne->nodeid == ne->host->node_id)
1465                 return;
1466
1467         bc_local = cpu_to_be32(ne->host->csr.broadcast_channel);
1468
1469         /* Check if the register is implemented and 1394a compliant. */
1470         error = hpsb_read(ne->host, ne->nodeid, generation, bc_addr, &bc_remote,
1471                           sizeof(bc_remote));
1472         if (!error && bc_remote & cpu_to_be32(0x80000000) &&
1473             bc_remote != bc_local)
1474                 hpsb_node_write(ne, bc_addr, &bc_local, sizeof(bc_local));
1475 }
1476
1477
1478 static void nodemgr_probe_ne(struct host_info *hi, struct node_entry *ne, int generation)
1479 {
1480         struct device *dev;
1481
1482         if (ne->host != hi->host || ne->in_limbo)
1483                 return;
1484
1485         dev = get_device(&ne->device);
1486         if (!dev)
1487                 return;
1488
1489         nodemgr_irm_write_bc(ne, generation);
1490
1491         /* If "needs_probe", then this is either a new or changed node we
1492          * rescan totally. If the generation matches for an existing node
1493          * (one that existed prior to the bus reset) we send update calls
1494          * down to the drivers. Otherwise, this is a dead node and we
1495          * suspend it. */
1496         if (ne->needs_probe)
1497                 nodemgr_process_root_directory(hi, ne);
1498         else if (ne->generation == generation)
1499                 nodemgr_update_pdrv(ne);
1500         else
1501                 nodemgr_suspend_ne(ne);
1502
1503         put_device(dev);
1504 }
1505
1506
1507 static void nodemgr_node_probe(struct host_info *hi, int generation)
1508 {
1509         struct hpsb_host *host = hi->host;
1510         struct class_device *cdev;
1511         struct node_entry *ne;
1512
1513         /* Do some processing of the nodes we've probed. This pulls them
1514          * into the sysfs layer if needed, and can result in processing of
1515          * unit-directories, or just updating the node and it's
1516          * unit-directories.
1517          *
1518          * Run updates before probes. Usually, updates are time-critical
1519          * while probes are time-consuming. (Well, those probes need some
1520          * improvement...) */
1521
1522         down(&nodemgr_ne_class.sem);
1523         list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
1524                 ne = container_of(cdev, struct node_entry, class_dev);
1525                 if (!ne->needs_probe)
1526                         nodemgr_probe_ne(hi, ne, generation);
1527         }
1528         list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
1529                 ne = container_of(cdev, struct node_entry, class_dev);
1530                 if (ne->needs_probe)
1531                         nodemgr_probe_ne(hi, ne, generation);
1532         }
1533         up(&nodemgr_ne_class.sem);
1534
1535
1536         /* If we had a bus reset while we were scanning the bus, it is
1537          * possible that we did not probe all nodes.  In that case, we
1538          * skip the clean up for now, since we could remove nodes that
1539          * were still on the bus.  Another bus scan is pending which will
1540          * do the clean up eventually.
1541          *
1542          * Now let's tell the bus to rescan our devices. This may seem
1543          * like overhead, but the driver-model core will only scan a
1544          * device for a driver when either the device is added, or when a
1545          * new driver is added. A bus reset is a good reason to rescan
1546          * devices that were there before.  For example, an sbp2 device
1547          * may become available for login, if the host that held it was
1548          * just removed.  */
1549
1550         if (generation == get_hpsb_generation(host))
1551                 if (bus_rescan_devices(&ieee1394_bus_type))
1552                         HPSB_DEBUG("bus_rescan_devices had an error");
1553 }
1554
1555 static int nodemgr_send_resume_packet(struct hpsb_host *host)
1556 {
1557         struct hpsb_packet *packet;
1558         int error = -ENOMEM;
1559
1560         packet = hpsb_make_phypacket(host,
1561                         EXTPHYPACKET_TYPE_RESUME |
1562                         NODEID_TO_NODE(host->node_id) << PHYPACKET_PORT_SHIFT);
1563         if (packet) {
1564                 packet->no_waiter = 1;
1565                 packet->generation = get_hpsb_generation(host);
1566                 error = hpsb_send_packet(packet);
1567         }
1568         if (error)
1569                 HPSB_WARN("fw-host%d: Failed to broadcast resume packet",
1570                           host->id);
1571         return error;
1572 }
1573
1574 /* Perform a few high-level IRM responsibilities. */
1575 static int nodemgr_do_irm_duties(struct hpsb_host *host, int cycles)
1576 {
1577         quadlet_t bc;
1578
1579         /* if irm_id == -1 then there is no IRM on this bus */
1580         if (!host->is_irm || host->irm_id == (nodeid_t)-1)
1581                 return 1;
1582
1583         /* We are a 1394a-2000 compliant IRM. Set the validity bit. */
1584         host->csr.broadcast_channel |= 0x40000000;
1585
1586         /* If there is no bus manager then we should set the root node's
1587          * force_root bit to promote bus stability per the 1394
1588          * spec. (8.4.2.6) */
1589         if (host->busmgr_id == 0xffff && host->node_count > 1)
1590         {
1591                 u16 root_node = host->node_count - 1;
1592
1593                 /* get cycle master capability flag from root node */
1594                 if (host->is_cycmst ||
1595                     (!hpsb_read(host, LOCAL_BUS | root_node, get_hpsb_generation(host),
1596                                 (CSR_REGISTER_BASE + CSR_CONFIG_ROM + 2 * sizeof(quadlet_t)),
1597                                 &bc, sizeof(quadlet_t)) &&
1598                      be32_to_cpu(bc) & 1 << CSR_CMC_SHIFT))
1599                         hpsb_send_phy_config(host, root_node, -1);
1600                 else {
1601                         HPSB_DEBUG("The root node is not cycle master capable; "
1602                                    "selecting a new root node and resetting...");
1603
1604                         if (cycles >= 5) {
1605                                 /* Oh screw it! Just leave the bus as it is */
1606                                 HPSB_DEBUG("Stopping reset loop for IRM sanity");
1607                                 return 1;
1608                         }
1609
1610                         hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1611                         hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1612
1613                         return 0;
1614                 }
1615         }
1616
1617         /* Some devices suspend their ports while being connected to an inactive
1618          * host adapter, i.e. if connected before the low-level driver is
1619          * loaded.  They become visible either when physically unplugged and
1620          * replugged, or when receiving a resume packet.  Send one once. */
1621         if (!host->resume_packet_sent && !nodemgr_send_resume_packet(host))
1622                 host->resume_packet_sent = 1;
1623
1624         return 1;
1625 }
1626
1627 /* We need to ensure that if we are not the IRM, that the IRM node is capable of
1628  * everything we can do, otherwise issue a bus reset and try to become the IRM
1629  * ourselves. */
1630 static int nodemgr_check_irm_capability(struct hpsb_host *host, int cycles)
1631 {
1632         quadlet_t bc;
1633         int status;
1634
1635         if (hpsb_disable_irm || host->is_irm)
1636                 return 1;
1637
1638         status = hpsb_read(host, LOCAL_BUS | (host->irm_id),
1639                            get_hpsb_generation(host),
1640                            (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL),
1641                            &bc, sizeof(quadlet_t));
1642
1643         if (status < 0 || !(be32_to_cpu(bc) & 0x80000000)) {
1644                 /* The current irm node does not have a valid BROADCAST_CHANNEL
1645                  * register and we do, so reset the bus with force_root set */
1646                 HPSB_DEBUG("Current remote IRM is not 1394a-2000 compliant, resetting...");
1647
1648                 if (cycles >= 5) {
1649                         /* Oh screw it! Just leave the bus as it is */
1650                         HPSB_DEBUG("Stopping reset loop for IRM sanity");
1651                         return 1;
1652                 }
1653
1654                 hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1655                 hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1656
1657                 return 0;
1658         }
1659
1660         return 1;
1661 }
1662
1663 static int nodemgr_host_thread(void *__hi)
1664 {
1665         struct host_info *hi = (struct host_info *)__hi;
1666         struct hpsb_host *host = hi->host;
1667         unsigned int g, generation = 0;
1668         int i, reset_cycles = 0;
1669
1670         /* Setup our device-model entries */
1671         nodemgr_create_host_dev_files(host);
1672
1673         for (;;) {
1674                 /* Sleep until next bus reset */
1675                 set_current_state(TASK_INTERRUPTIBLE);
1676                 if (get_hpsb_generation(host) == generation &&
1677                     !kthread_should_stop())
1678                         schedule();
1679                 __set_current_state(TASK_RUNNING);
1680
1681                 /* Thread may have been woken up to freeze or to exit */
1682                 if (try_to_freeze())
1683                         continue;
1684                 if (kthread_should_stop())
1685                         goto exit;
1686
1687                 if (mutex_lock_interruptible(&nodemgr_serialize)) {
1688                         if (try_to_freeze())
1689                                 continue;
1690                         goto exit;
1691                 }
1692
1693                 /* Pause for 1/4 second in 1/16 second intervals,
1694                  * to make sure things settle down. */
1695                 g = get_hpsb_generation(host);
1696                 for (i = 0; i < 4 ; i++) {
1697                         if (msleep_interruptible(63) || kthread_should_stop())
1698                                 goto unlock_exit;
1699
1700                         /* Now get the generation in which the node ID's we collect
1701                          * are valid.  During the bus scan we will use this generation
1702                          * for the read transactions, so that if another reset occurs
1703                          * during the scan the transactions will fail instead of
1704                          * returning bogus data. */
1705                         generation = get_hpsb_generation(host);
1706
1707                         /* If we get a reset before we are done waiting, then
1708                          * start the the waiting over again */
1709                         if (generation != g)
1710                                 g = generation, i = 0;
1711                 }
1712
1713                 if (!nodemgr_check_irm_capability(host, reset_cycles) ||
1714                     !nodemgr_do_irm_duties(host, reset_cycles)) {
1715                         reset_cycles++;
1716                         mutex_unlock(&nodemgr_serialize);
1717                         continue;
1718                 }
1719                 reset_cycles = 0;
1720
1721                 /* Scan our nodes to get the bus options and create node
1722                  * entries. This does not do the sysfs stuff, since that
1723                  * would trigger uevents and such, which is a bad idea at
1724                  * this point. */
1725                 nodemgr_node_scan(hi, generation);
1726
1727                 /* This actually does the full probe, with sysfs
1728                  * registration. */
1729                 nodemgr_node_probe(hi, generation);
1730
1731                 /* Update some of our sysfs symlinks */
1732                 nodemgr_update_host_dev_links(host);
1733
1734                 mutex_unlock(&nodemgr_serialize);
1735         }
1736 unlock_exit:
1737         mutex_unlock(&nodemgr_serialize);
1738 exit:
1739         HPSB_VERBOSE("NodeMgr: Exiting thread");
1740         return 0;
1741 }
1742
1743 /**
1744  * nodemgr_for_each_host - call a function for each IEEE 1394 host
1745  * @data: an address to supply to the callback
1746  * @cb: function to call for each host
1747  *
1748  * Iterate the hosts, calling a given function with supplied data for each host.
1749  * If the callback fails on a host, i.e. if it returns a non-zero value, the
1750  * iteration is stopped.
1751  *
1752  * Return value: 0 on success, non-zero on failure (same as returned by last run
1753  * of the callback).
1754  */
1755 int nodemgr_for_each_host(void *data, int (*cb)(struct hpsb_host *, void *))
1756 {
1757         struct class_device *cdev;
1758         struct hpsb_host *host;
1759         int error = 0;
1760
1761         down(&hpsb_host_class.sem);
1762         list_for_each_entry(cdev, &hpsb_host_class.children, node) {
1763                 host = container_of(cdev, struct hpsb_host, class_dev);
1764
1765                 if ((error = cb(host, data)))
1766                         break;
1767         }
1768         up(&hpsb_host_class.sem);
1769
1770         return error;
1771 }
1772
1773 /* The following two convenience functions use a struct node_entry
1774  * for addressing a node on the bus.  They are intended for use by any
1775  * process context, not just the nodemgr thread, so we need to be a
1776  * little careful when reading out the node ID and generation.  The
1777  * thing that can go wrong is that we get the node ID, then a bus
1778  * reset occurs, and then we read the generation.  The node ID is
1779  * possibly invalid, but the generation is current, and we end up
1780  * sending a packet to a the wrong node.
1781  *
1782  * The solution is to make sure we read the generation first, so that
1783  * if a reset occurs in the process, we end up with a stale generation
1784  * and the transactions will fail instead of silently using wrong node
1785  * ID's.
1786  */
1787
1788 /**
1789  * hpsb_node_fill_packet - fill some destination information into a packet
1790  * @ne: destination node
1791  * @packet: packet to fill in
1792  *
1793  * This will fill in the given, pre-initialised hpsb_packet with the current
1794  * information from the node entry (host, node ID, bus generation number).
1795  */
1796 void hpsb_node_fill_packet(struct node_entry *ne, struct hpsb_packet *packet)
1797 {
1798         packet->host = ne->host;
1799         packet->generation = ne->generation;
1800         barrier();
1801         packet->node_id = ne->nodeid;
1802 }
1803
1804 int hpsb_node_write(struct node_entry *ne, u64 addr,
1805                     quadlet_t *buffer, size_t length)
1806 {
1807         unsigned int generation = ne->generation;
1808
1809         barrier();
1810         return hpsb_write(ne->host, ne->nodeid, generation,
1811                           addr, buffer, length);
1812 }
1813
1814 static void nodemgr_add_host(struct hpsb_host *host)
1815 {
1816         struct host_info *hi;
1817
1818         hi = hpsb_create_hostinfo(&nodemgr_highlevel, host, sizeof(*hi));
1819         if (!hi) {
1820                 HPSB_ERR("NodeMgr: out of memory in add host");
1821                 return;
1822         }
1823         hi->host = host;
1824         hi->thread = kthread_run(nodemgr_host_thread, hi, "knodemgrd_%d",
1825                                  host->id);
1826         if (IS_ERR(hi->thread)) {
1827                 HPSB_ERR("NodeMgr: cannot start thread for host %d", host->id);
1828                 hpsb_destroy_hostinfo(&nodemgr_highlevel, host);
1829         }
1830 }
1831
1832 static void nodemgr_host_reset(struct hpsb_host *host)
1833 {
1834         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1835
1836         if (hi) {
1837                 HPSB_VERBOSE("NodeMgr: Processing reset for host %d", host->id);
1838                 wake_up_process(hi->thread);
1839         }
1840 }
1841
1842 static void nodemgr_remove_host(struct hpsb_host *host)
1843 {
1844         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1845
1846         if (hi) {
1847                 kthread_stop(hi->thread);
1848                 nodemgr_remove_host_dev(&host->device);
1849         }
1850 }
1851
1852 static struct hpsb_highlevel nodemgr_highlevel = {
1853         .name =         "Node manager",
1854         .add_host =     nodemgr_add_host,
1855         .host_reset =   nodemgr_host_reset,
1856         .remove_host =  nodemgr_remove_host,
1857 };
1858
1859 int init_ieee1394_nodemgr(void)
1860 {
1861         int error;
1862
1863         error = class_register(&nodemgr_ne_class);
1864         if (error)
1865                 goto fail_ne;
1866         error = class_register(&nodemgr_ud_class);
1867         if (error)
1868                 goto fail_ud;
1869         error = driver_register(&nodemgr_mid_layer_driver);
1870         if (error)
1871                 goto fail_ml;
1872         /* This driver is not used if nodemgr is off (disable_nodemgr=1). */
1873         nodemgr_dev_template_host.driver = &nodemgr_mid_layer_driver;
1874
1875         hpsb_register_highlevel(&nodemgr_highlevel);
1876         return 0;
1877
1878 fail_ml:
1879         class_unregister(&nodemgr_ud_class);
1880 fail_ud:
1881         class_unregister(&nodemgr_ne_class);
1882 fail_ne:
1883         return error;
1884 }
1885
1886 void cleanup_ieee1394_nodemgr(void)
1887 {
1888         hpsb_unregister_highlevel(&nodemgr_highlevel);
1889         driver_unregister(&nodemgr_mid_layer_driver);
1890         class_unregister(&nodemgr_ud_class);
1891         class_unregister(&nodemgr_ne_class);
1892 }