drivers/ieee1394/nodemgr.c

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