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 #include <asm/semaphore.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
 524         for (id = driver->id_table; id->match_flags != 0; id++) {
 525                 int need_coma = 0;
 526
 527                 if (id->match_flags & IEEE1394_MATCH_VENDOR_ID) {
 528                         length += sprintf(scratch, "vendor_id=0x%06x", id->vendor_id);
 529                         scratch = buf + length;
 530                         need_coma++;
 531                 }
 532
 533                 if (id->match_flags & IEEE1394_MATCH_MODEL_ID) {
 534                         length += sprintf(scratch, "%smodel_id=0x%06x",
 535                                           need_coma++ ? "," : "",
 536                                           id->model_id);
 537                         scratch = buf + length;
 538                 }
 539
 540                 if (id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) {
 541                         length += sprintf(scratch, "%sspecifier_id=0x%06x",
 542                                           need_coma++ ? "," : "",
 543                                           id->specifier_id);
 544                         scratch = buf + length;
 545                 }
 546
 547                 if (id->match_flags & IEEE1394_MATCH_VERSION) {
 548                         length += sprintf(scratch, "%sversion=0x%06x",
 549                                           need_coma++ ? "," : "",
 550                                           id->version);
 551                         scratch = buf + length;
 552                 }
 553
 554                 if (need_coma) {
 555                         *scratch++ = '\n';
 556                         length++;
 557                 }
 558         }
 559
 560         return length;
 561 }
 562 static DRIVER_ATTR(device_ids,S_IRUGO,fw_show_drv_device_ids,NULL);
 563
 564
 565 fw_drv_attr(name, const char *, "%s\n")
 566
 567 static struct driver_attribute *const fw_drv_attrs[] = {
 568         &driver_attr_drv_name,
 569         &driver_attr_device_ids,
 570 };
 571
 572
 573 static void nodemgr_create_drv_files(struct hpsb_protocol_driver *driver)
 574 {
 575         struct device_driver *drv = &driver->driver;
 576         int i;
 577
 578         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
 579                 if (driver_create_file(drv, fw_drv_attrs[i]))
 580                         goto fail;
 581         return;
 582 fail:
 583         HPSB_ERR("Failed to add sysfs attribute");
 584 }
 585
 586
 587 static void nodemgr_remove_drv_files(struct hpsb_protocol_driver *driver)
 588 {
 589         struct device_driver *drv = &driver->driver;
 590         int i;
 591
 592         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
 593                 driver_remove_file(drv, fw_drv_attrs[i]);
 594 }
 595
 596
 597 static void nodemgr_create_ne_dev_files(struct node_entry *ne)
 598 {
 599         struct device *dev = &ne->device;
 600         int i;
 601
 602         for (i = 0; i < ARRAY_SIZE(fw_ne_attrs); i++)
 603                 if (device_create_file(dev, fw_ne_attrs[i]))
 604                         goto fail;
 605         return;
 606 fail:
 607         HPSB_ERR("Failed to add sysfs attribute");
 608 }
 609
 610
 611 static void nodemgr_create_host_dev_files(struct hpsb_host *host)
 612 {
 613         struct device *dev = &host->device;
 614         int i;
 615
 616         for (i = 0; i < ARRAY_SIZE(fw_host_attrs); i++)
 617                 if (device_create_file(dev, fw_host_attrs[i]))
 618                         goto fail;
 619         return;
 620 fail:
 621         HPSB_ERR("Failed to add sysfs attribute");
 622 }
 623
 624
 625 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
 626                                                nodeid_t nodeid);
 627
 628 static void nodemgr_update_host_dev_links(struct hpsb_host *host)
 629 {
 630         struct device *dev = &host->device;
 631         struct node_entry *ne;
 632
 633         sysfs_remove_link(&dev->kobj, "irm_id");
 634         sysfs_remove_link(&dev->kobj, "busmgr_id");
 635         sysfs_remove_link(&dev->kobj, "host_id");
 636
 637         if ((ne = find_entry_by_nodeid(host, host->irm_id)) &&
 638             sysfs_create_link(&dev->kobj, &ne->device.kobj, "irm_id"))
 639                 goto fail;
 640         if ((ne = find_entry_by_nodeid(host, host->busmgr_id)) &&
 641             sysfs_create_link(&dev->kobj, &ne->device.kobj, "busmgr_id"))
 642                 goto fail;
 643         if ((ne = find_entry_by_nodeid(host, host->node_id)) &&
 644             sysfs_create_link(&dev->kobj, &ne->device.kobj, "host_id"))
 645                 goto fail;
 646         return;
 647 fail:
 648         HPSB_ERR("Failed to update sysfs attributes for host %d", host->id);
 649 }
 650
 651 static void nodemgr_create_ud_dev_files(struct unit_directory *ud)
 652 {
 653         struct device *dev = &ud->device;
 654         int i;
 655
 656         for (i = 0; i < ARRAY_SIZE(fw_ud_attrs); i++)
 657                 if (device_create_file(dev, fw_ud_attrs[i]))
 658                         goto fail;
 659         if (ud->flags & UNIT_DIRECTORY_SPECIFIER_ID)
 660                 if (device_create_file(dev, &dev_attr_ud_specifier_id))
 661                         goto fail;
 662         if (ud->flags & UNIT_DIRECTORY_VERSION)
 663                 if (device_create_file(dev, &dev_attr_ud_version))
 664                         goto fail;
 665         if (ud->flags & UNIT_DIRECTORY_VENDOR_ID) {
 666                 if (device_create_file(dev, &dev_attr_ud_vendor_id))
 667                         goto fail;
 668                 if (ud->vendor_name_kv &&
 669                     device_create_file(dev, &dev_attr_ud_vendor_name_kv))
 670                         goto fail;
 671         }
 672         if (ud->flags & UNIT_DIRECTORY_MODEL_ID) {
 673                 if (device_create_file(dev, &dev_attr_ud_model_id))
 674                         goto fail;
 675                 if (ud->model_name_kv &&
 676                     device_create_file(dev, &dev_attr_ud_model_name_kv))
 677                         goto fail;
 678         }
 679         return;
 680 fail:
 681         HPSB_ERR("Failed to add sysfs attribute");
 682 }
 683
 684
 685 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv)
 686 {
 687         struct hpsb_protocol_driver *driver;
 688         struct unit_directory *ud;
 689         struct ieee1394_device_id *id;
 690
 691         /* We only match unit directories */
 692         if (dev->platform_data != &nodemgr_ud_platform_data)
 693                 return 0;
 694
 695         ud = container_of(dev, struct unit_directory, device);
 696         if (ud->ne->in_limbo || ud->ignore_driver)
 697                 return 0;
 698
 699         /* We only match drivers of type hpsb_protocol_driver */
 700         if (drv == &nodemgr_mid_layer_driver)
 701                 return 0;
 702
 703         driver = container_of(drv, struct hpsb_protocol_driver, driver);
 704         id = driver->id_table;
 705         if (!id)
 706                 return 0;
 707
 708         for (; id->match_flags != 0; id++) {
 709                 if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) &&
 710                     id->vendor_id != ud->vendor_id)
 711                         continue;
 712
 713                 if ((id->match_flags & IEEE1394_MATCH_MODEL_ID) &&
 714                     id->model_id != ud->model_id)
 715                         continue;
 716
 717                 if ((id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) &&
 718                     id->specifier_id != ud->specifier_id)
 719                         continue;
 720
 721                 if ((id->match_flags & IEEE1394_MATCH_VERSION) &&
 722                     id->version != ud->version)
 723                         continue;
 724
 725                 return 1;
 726         }
 727
 728         return 0;
 729 }
 730
 731
 732 static DEFINE_MUTEX(nodemgr_serialize_remove_uds);
 733
 734 static int __match_ne(struct device *dev, void *data)
 735 {
 736         struct unit_directory *ud;
 737         struct node_entry *ne = (struct node_entry *)data;
 738
 739         ud = container_of(dev, struct unit_directory, unit_dev);
 740         return ud->ne == ne;
 741 }
 742
 743 static void nodemgr_remove_uds(struct node_entry *ne)
 744 {
 745         struct device *dev;
 746         struct unit_directory *ud;
 747
 748         /* Use class_find device to iterate the devices. Since this code
 749          * may be called from other contexts besides the knodemgrds,
 750          * protect it by nodemgr_serialize_remove_uds.
 751          */
 752         mutex_lock(&nodemgr_serialize_remove_uds);
 753         for (;;) {
 754                 dev = class_find_device(&nodemgr_ud_class, ne, __match_ne);
 755                 if (!dev)
 756                         break;
 757                 ud = container_of(dev, struct unit_directory, unit_dev);
 758                 put_device(dev);
 759                 device_unregister(&ud->unit_dev);
 760                 device_unregister(&ud->device);
 761         }
 762         mutex_unlock(&nodemgr_serialize_remove_uds);
 763 }
 764
 765
 766 static void nodemgr_remove_ne(struct node_entry *ne)
 767 {
 768         struct device *dev;
 769
 770         dev = get_device(&ne->device);
 771         if (!dev)
 772                 return;
 773
 774         HPSB_DEBUG("Node removed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 775                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
 776         nodemgr_remove_uds(ne);
 777
 778         device_unregister(&ne->node_dev);
 779         device_unregister(dev);
 780
 781         put_device(dev);
 782 }
 783
 784 static int __nodemgr_remove_host_dev(struct device *dev, void *data)
 785 {
 786         if (dev->bus == &ieee1394_bus_type)
 787                 nodemgr_remove_ne(container_of(dev, struct node_entry,
 788                                   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->node_dev.parent = &ne->device;
 856         ne->node_dev.class = &nodemgr_ne_class;
 857         snprintf(ne->node_dev.bus_id, BUS_ID_SIZE, "%016Lx",
 858                 (unsigned long long)(ne->guid));
 859
 860         if (device_register(&ne->device))
 861                 goto fail_devreg;
 862         if (device_register(&ne->node_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 static int __match_ne_guid(struct device *dev, void *data)
 888 {
 889         struct node_entry *ne;
 890         u64 *guid = (u64 *)data;
 891
 892         ne = container_of(dev, struct node_entry, node_dev);
 893         return ne->guid == *guid;
 894 }
 895
 896 static struct node_entry *find_entry_by_guid(u64 guid)
 897 {
 898         struct device *dev;
 899         struct node_entry *ne;
 900
 901         dev = class_find_device(&nodemgr_ne_class, &guid, __match_ne_guid);
 902         if (!dev)
 903                 return NULL;
 904         ne = container_of(dev, struct node_entry, node_dev);
 905         put_device(dev);
 906
 907         return ne;
 908 }
 909
 910 struct match_nodeid_param {
 911         struct hpsb_host *host;
 912         nodeid_t nodeid;
 913 };
 914
 915 static int __match_ne_nodeid(struct device *dev, void *data)
 916 {
 917         int found = 0;
 918         struct node_entry *ne;
 919         struct match_nodeid_param *param = (struct match_nodeid_param *)data;
 920
 921         if (!dev)
 922                 goto ret;
 923         ne = container_of(dev, struct node_entry, node_dev);
 924         if (ne->host == param->host && ne->nodeid == param->nodeid)
 925                 found = 1;
 926 ret:
 927         return found;
 928 }
 929
 930 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
 931                                                nodeid_t nodeid)
 932 {
 933         struct device *dev;
 934         struct node_entry *ne;
 935         struct match_nodeid_param param;
 936
 937         param.host = host;
 938         param.nodeid = nodeid;
 939
 940         dev = class_find_device(&nodemgr_ne_class, &param, __match_ne_nodeid);
 941         if (!dev)
 942                 return NULL;
 943         ne = container_of(dev, struct node_entry, node_dev);
 944         put_device(dev);
 945
 946         return ne;
 947 }
 948
 949
 950 static void nodemgr_register_device(struct node_entry *ne,
 951         struct unit_directory *ud, struct device *parent)
 952 {
 953         memcpy(&ud->device, &nodemgr_dev_template_ud,
 954                sizeof(ud->device));
 955
 956         ud->device.parent = parent;
 957
 958         snprintf(ud->device.bus_id, BUS_ID_SIZE, "%s-%u",
 959                  ne->device.bus_id, ud->id);
 960
 961         ud->unit_dev.parent = &ud->device;
 962         ud->unit_dev.class = &nodemgr_ud_class;
 963         snprintf(ud->unit_dev.bus_id, BUS_ID_SIZE, "%s-%u",
 964                  ne->device.bus_id, ud->id);
 965
 966         if (device_register(&ud->device))
 967                 goto fail_devreg;
 968         if (device_register(&ud->unit_dev))
 969                 goto fail_classdevreg;
 970         get_device(&ud->device);
 971
 972         nodemgr_create_ud_dev_files(ud);
 973
 974         return;
 975
 976 fail_classdevreg:
 977         device_unregister(&ud->device);
 978 fail_devreg:
 979         HPSB_ERR("Failed to create unit %s", ud->device.bus_id);
 980 }
 981
 982
 983 /* This implementation currently only scans the config rom and its
 984  * immediate unit directories looking for software_id and
 985  * software_version entries, in order to get driver autoloading working. */
 986 static struct unit_directory *nodemgr_process_unit_directory
 987         (struct host_info *hi, struct node_entry *ne, struct csr1212_keyval *ud_kv,
 988          unsigned int *id, struct unit_directory *parent)
 989 {
 990         struct unit_directory *ud;
 991         struct unit_directory *ud_child = NULL;
 992         struct csr1212_dentry *dentry;
 993         struct csr1212_keyval *kv;
 994         u8 last_key_id = 0;
 995
 996         ud = kzalloc(sizeof(*ud), GFP_KERNEL);
 997         if (!ud)
 998                 goto unit_directory_error;
 999
1000         ud->ne = ne;
1001         ud->ignore_driver = ignore_drivers;
1002         ud->address = ud_kv->offset + CSR1212_REGISTER_SPACE_BASE;
1003         ud->directory_id = ud->address & 0xffffff;
1004         ud->ud_kv = ud_kv;
1005         ud->id = (*id)++;
1006
1007         csr1212_for_each_dir_entry(ne->csr, kv, ud_kv, dentry) {
1008                 switch (kv->key.id) {
1009                 case CSR1212_KV_ID_VENDOR:
1010                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
1011                                 ud->vendor_id = kv->value.immediate;
1012                                 ud->flags |= UNIT_DIRECTORY_VENDOR_ID;
1013                         }
1014                         break;
1015
1016                 case CSR1212_KV_ID_MODEL:
1017                         ud->model_id = kv->value.immediate;
1018                         ud->flags |= UNIT_DIRECTORY_MODEL_ID;
1019                         break;
1020
1021                 case CSR1212_KV_ID_SPECIFIER_ID:
1022                         ud->specifier_id = kv->value.immediate;
1023                         ud->flags |= UNIT_DIRECTORY_SPECIFIER_ID;
1024                         break;
1025
1026                 case CSR1212_KV_ID_VERSION:
1027                         ud->version = kv->value.immediate;
1028                         ud->flags |= UNIT_DIRECTORY_VERSION;
1029                         break;
1030
1031                 case CSR1212_KV_ID_DESCRIPTOR:
1032                         if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1033                             CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1034                             CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1035                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1036                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1037                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1038                                 switch (last_key_id) {
1039                                 case CSR1212_KV_ID_VENDOR:
1040                                         csr1212_keep_keyval(kv);
1041                                         ud->vendor_name_kv = kv;
1042                                         break;
1043
1044                                 case CSR1212_KV_ID_MODEL:
1045                                         csr1212_keep_keyval(kv);
1046                                         ud->model_name_kv = kv;
1047                                         break;
1048
1049                                 }
1050                         } /* else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) ... */
1051                         break;
1052
1053                 case CSR1212_KV_ID_DEPENDENT_INFO:
1054                         /* Logical Unit Number */
1055                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
1056                                 if (ud->flags & UNIT_DIRECTORY_HAS_LUN) {
1057                                         ud_child = kmemdup(ud, sizeof(*ud_child), GFP_KERNEL);
1058                                         if (!ud_child)
1059                                                 goto unit_directory_error;
1060                                         nodemgr_register_device(ne, ud_child, &ne->device);
1061                                         ud_child = NULL;
1062
1063                                         ud->id = (*id)++;
1064                                 }
1065                                 ud->lun = kv->value.immediate;
1066                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN;
1067
1068                         /* Logical Unit Directory */
1069                         } else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) {
1070                                 /* This should really be done in SBP2 as this is
1071                                  * doing SBP2 specific parsing.
1072                                  */
1073
1074                                 /* first register the parent unit */
1075                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN_DIRECTORY;
1076                                 if (ud->device.bus != &ieee1394_bus_type)
1077                                         nodemgr_register_device(ne, ud, &ne->device);
1078
1079                                 /* process the child unit */
1080                                 ud_child = nodemgr_process_unit_directory(hi, ne, kv, id, ud);
1081
1082                                 if (ud_child == NULL)
1083                                         break;
1084
1085                                 /* inherit unspecified values, the driver core picks it up */
1086                                 if ((ud->flags & UNIT_DIRECTORY_MODEL_ID) &&
1087                                     !(ud_child->flags & UNIT_DIRECTORY_MODEL_ID))
1088                                 {
1089                                         ud_child->flags |=  UNIT_DIRECTORY_MODEL_ID;
1090                                         ud_child->model_id = ud->model_id;
1091                                 }
1092                                 if ((ud->flags & UNIT_DIRECTORY_SPECIFIER_ID) &&
1093                                     !(ud_child->flags & UNIT_DIRECTORY_SPECIFIER_ID))
1094                                 {
1095                                         ud_child->flags |=  UNIT_DIRECTORY_SPECIFIER_ID;
1096                                         ud_child->specifier_id = ud->specifier_id;
1097                                 }
1098                                 if ((ud->flags & UNIT_DIRECTORY_VERSION) &&
1099                                     !(ud_child->flags & UNIT_DIRECTORY_VERSION))
1100                                 {
1101                                         ud_child->flags |=  UNIT_DIRECTORY_VERSION;
1102                                         ud_child->version = ud->version;
1103                                 }
1104
1105                                 /* register the child unit */
1106                                 ud_child->flags |= UNIT_DIRECTORY_LUN_DIRECTORY;
1107                                 nodemgr_register_device(ne, ud_child, &ud->device);
1108                         }
1109
1110                         break;
1111
1112                 case CSR1212_KV_ID_DIRECTORY_ID:
1113                         ud->directory_id = kv->value.immediate;
1114                         break;
1115
1116                 default:
1117                         break;
1118                 }
1119                 last_key_id = kv->key.id;
1120         }
1121
1122         /* do not process child units here and only if not already registered */
1123         if (!parent && ud->device.bus != &ieee1394_bus_type)
1124                 nodemgr_register_device(ne, ud, &ne->device);
1125
1126         return ud;
1127
1128 unit_directory_error:
1129         kfree(ud);
1130         return NULL;
1131 }
1132
1133
1134 static void nodemgr_process_root_directory(struct host_info *hi, struct node_entry *ne)
1135 {
1136         unsigned int ud_id = 0;
1137         struct csr1212_dentry *dentry;
1138         struct csr1212_keyval *kv, *vendor_name_kv = NULL;
1139         u8 last_key_id = 0;
1140
1141         ne->needs_probe = 0;
1142
1143         csr1212_for_each_dir_entry(ne->csr, kv, ne->csr->root_kv, dentry) {
1144                 switch (kv->key.id) {
1145                 case CSR1212_KV_ID_VENDOR:
1146                         ne->vendor_id = kv->value.immediate;
1147                         break;
1148
1149                 case CSR1212_KV_ID_NODE_CAPABILITIES:
1150                         ne->capabilities = kv->value.immediate;
1151                         break;
1152
1153                 case CSR1212_KV_ID_UNIT:
1154                         nodemgr_process_unit_directory(hi, ne, kv, &ud_id, NULL);
1155                         break;
1156
1157                 case CSR1212_KV_ID_DESCRIPTOR:
1158                         if (last_key_id == CSR1212_KV_ID_VENDOR) {
1159                                 if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1160                                     CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1161                                     CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1162                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1163                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1164                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1165                                         csr1212_keep_keyval(kv);
1166                                         vendor_name_kv = kv;
1167                                 }
1168                         }
1169                         break;
1170                 }
1171                 last_key_id = kv->key.id;
1172         }
1173
1174         if (ne->vendor_name_kv) {
1175                 kv = ne->vendor_name_kv;
1176                 ne->vendor_name_kv = vendor_name_kv;
1177                 csr1212_release_keyval(kv);
1178         } else if (vendor_name_kv) {
1179                 ne->vendor_name_kv = vendor_name_kv;
1180                 if (device_create_file(&ne->device,
1181                                        &dev_attr_ne_vendor_name_kv) != 0)
1182                         HPSB_ERR("Failed to add sysfs attribute");
1183         }
1184 }
1185
1186 #ifdef CONFIG_HOTPLUG
1187
1188 static int nodemgr_uevent(struct device *dev, struct kobj_uevent_env *env)
1189 {
1190         struct unit_directory *ud;
1191         int retval = 0;
1192         /* ieee1394:venNmoNspNverN */
1193         char buf[8 + 1 + 3 + 8 + 2 + 8 + 2 + 8 + 3 + 8 + 1];
1194
1195         if (!dev)
1196                 return -ENODEV;
1197
1198         ud = container_of(dev, struct unit_directory, unit_dev);
1199
1200         if (ud->ne->in_limbo || ud->ignore_driver)
1201                 return -ENODEV;
1202
1203 #define PUT_ENVP(fmt,val)                                       \
1204 do {                                                            \
1205         retval = add_uevent_var(env, fmt, val);         \
1206         if (retval)                                             \
1207                 return retval;                                  \
1208 } while (0)
1209
1210         PUT_ENVP("VENDOR_ID=%06x", ud->vendor_id);
1211         PUT_ENVP("MODEL_ID=%06x", ud->model_id);
1212         PUT_ENVP("GUID=%016Lx", (unsigned long long)ud->ne->guid);
1213         PUT_ENVP("SPECIFIER_ID=%06x", ud->specifier_id);
1214         PUT_ENVP("VERSION=%06x", ud->version);
1215         snprintf(buf, sizeof(buf), "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
1216                         ud->vendor_id,
1217                         ud->model_id,
1218                         ud->specifier_id,
1219                         ud->version);
1220         PUT_ENVP("MODALIAS=%s", buf);
1221
1222 #undef PUT_ENVP
1223
1224         return 0;
1225 }
1226
1227 #else
1228
1229 static int nodemgr_uevent(struct device *dev, struct kobj_uevent_env *env)
1230 {
1231         return -ENODEV;
1232 }
1233
1234 #endif /* CONFIG_HOTPLUG */
1235
1236
1237 int __hpsb_register_protocol(struct hpsb_protocol_driver *drv,
1238                              struct module *owner)
1239 {
1240         int error;
1241
1242         drv->driver.bus = &ieee1394_bus_type;
1243         drv->driver.owner = owner;
1244         drv->driver.name = drv->name;
1245
1246         /* This will cause a probe for devices */
1247         error = driver_register(&drv->driver);
1248         if (!error)
1249                 nodemgr_create_drv_files(drv);
1250         return error;
1251 }
1252
1253 void hpsb_unregister_protocol(struct hpsb_protocol_driver *driver)
1254 {
1255         nodemgr_remove_drv_files(driver);
1256         /* This will subsequently disconnect all devices that our driver
1257          * is attached to. */
1258         driver_unregister(&driver->driver);
1259 }
1260
1261
1262 /*
1263  * This function updates nodes that were present on the bus before the
1264  * reset and still are after the reset.  The nodeid and the config rom
1265  * may have changed, and the drivers managing this device must be
1266  * informed that this device just went through a bus reset, to allow
1267  * the to take whatever actions required.
1268  */
1269 static void nodemgr_update_node(struct node_entry *ne, struct csr1212_csr *csr,
1270                                 struct host_info *hi, nodeid_t nodeid,
1271                                 unsigned int generation)
1272 {
1273         if (ne->nodeid != nodeid) {
1274                 HPSB_DEBUG("Node changed: " NODE_BUS_FMT " -> " NODE_BUS_FMT,
1275                            NODE_BUS_ARGS(ne->host, ne->nodeid),
1276                            NODE_BUS_ARGS(ne->host, nodeid));
1277                 ne->nodeid = nodeid;
1278         }
1279
1280         if (ne->busopt.generation != ((be32_to_cpu(csr->bus_info_data[2]) >> 4) & 0xf)) {
1281                 kfree(ne->csr->private);
1282                 csr1212_destroy_csr(ne->csr);
1283                 ne->csr = csr;
1284
1285                 /* If the node's configrom generation has changed, we
1286                  * unregister all the unit directories. */
1287                 nodemgr_remove_uds(ne);
1288
1289                 nodemgr_update_bus_options(ne);
1290
1291                 /* Mark the node as new, so it gets re-probed */
1292                 ne->needs_probe = 1;
1293         } else {
1294                 /* old cache is valid, so update its generation */
1295                 struct nodemgr_csr_info *ci = ne->csr->private;
1296                 ci->generation = generation;
1297                 /* free the partially filled now unneeded new cache */
1298                 kfree(csr->private);
1299                 csr1212_destroy_csr(csr);
1300         }
1301
1302         if (ne->in_limbo)
1303                 nodemgr_resume_ne(ne);
1304
1305         /* Mark the node current */
1306         ne->generation = generation;
1307 }
1308
1309
1310
1311 static void nodemgr_node_scan_one(struct host_info *hi,
1312                                   nodeid_t nodeid, int generation)
1313 {
1314         struct hpsb_host *host = hi->host;
1315         struct node_entry *ne;
1316         octlet_t guid;
1317         struct csr1212_csr *csr;
1318         struct nodemgr_csr_info *ci;
1319         u8 *speed;
1320
1321         ci = kmalloc(sizeof(*ci), GFP_KERNEL);
1322         if (!ci)
1323                 return;
1324
1325         ci->host = host;
1326         ci->nodeid = nodeid;
1327         ci->generation = generation;
1328
1329         /* Prepare for speed probe which occurs when reading the ROM */
1330         speed = &(host->speed[NODEID_TO_NODE(nodeid)]);
1331         if (*speed > host->csr.lnk_spd)
1332                 *speed = host->csr.lnk_spd;
1333         ci->speed_unverified = *speed > IEEE1394_SPEED_100;
1334
1335         /* We need to detect when the ConfigROM's generation has changed,
1336          * so we only update the node's info when it needs to be.  */
1337
1338         csr = csr1212_create_csr(&nodemgr_csr_ops, 5 * sizeof(quadlet_t), ci);
1339         if (!csr || csr1212_parse_csr(csr) != CSR1212_SUCCESS) {
1340                 HPSB_ERR("Error parsing configrom for node " NODE_BUS_FMT,
1341                          NODE_BUS_ARGS(host, nodeid));
1342                 if (csr)
1343                         csr1212_destroy_csr(csr);
1344                 kfree(ci);
1345                 return;
1346         }
1347
1348         if (csr->bus_info_data[1] != IEEE1394_BUSID_MAGIC) {
1349                 /* This isn't a 1394 device, but we let it slide. There
1350                  * was a report of a device with broken firmware which
1351                  * reported '2394' instead of '1394', which is obviously a
1352                  * mistake. One would hope that a non-1394 device never
1353                  * gets connected to Firewire bus. If someone does, we
1354                  * shouldn't be held responsible, so we'll allow it with a
1355                  * warning.  */
1356                 HPSB_WARN("Node " NODE_BUS_FMT " has invalid busID magic [0x%08x]",
1357                           NODE_BUS_ARGS(host, nodeid), csr->bus_info_data[1]);
1358         }
1359
1360         guid = ((u64)be32_to_cpu(csr->bus_info_data[3]) << 32) | be32_to_cpu(csr->bus_info_data[4]);
1361         ne = find_entry_by_guid(guid);
1362
1363         if (ne && ne->host != host && ne->in_limbo) {
1364                 /* Must have moved this device from one host to another */
1365                 nodemgr_remove_ne(ne);
1366                 ne = NULL;
1367         }
1368
1369         if (!ne)
1370                 nodemgr_create_node(guid, csr, hi, nodeid, generation);
1371         else
1372                 nodemgr_update_node(ne, csr, hi, nodeid, generation);
1373 }
1374
1375
1376 static void nodemgr_node_scan(struct host_info *hi, int generation)
1377 {
1378         int count;
1379         struct hpsb_host *host = hi->host;
1380         struct selfid *sid = (struct selfid *)host->topology_map;
1381         nodeid_t nodeid = LOCAL_BUS;
1382
1383         /* Scan each node on the bus */
1384         for (count = host->selfid_count; count; count--, sid++) {
1385                 if (sid->extended)
1386                         continue;
1387
1388                 if (!sid->link_active) {
1389                         nodeid++;
1390                         continue;
1391                 }
1392                 nodemgr_node_scan_one(hi, nodeid++, generation);
1393         }
1394 }
1395
1396 static int __nodemgr_driver_suspend(struct device *dev, void *data)
1397 {
1398         struct unit_directory *ud;
1399         struct device_driver *drv;
1400         struct node_entry *ne = (struct node_entry *)data;
1401         int error;
1402
1403         ud = container_of(dev, struct unit_directory, unit_dev);
1404         if (ud->ne == ne) {
1405                 drv = get_driver(ud->device.driver);
1406                 if (drv) {
1407                         error = 1; /* release if suspend is not implemented */
1408                         if (drv->suspend) {
1409                                 down(&ud->device.sem);
1410                                 error = drv->suspend(&ud->device, PMSG_SUSPEND);
1411                                 up(&ud->device.sem);
1412                         }
1413                         if (error)
1414                                 device_release_driver(&ud->device);
1415                         put_driver(drv);
1416                 }
1417         }
1418
1419         return 0;
1420 }
1421
1422 static int __nodemgr_driver_resume(struct device *dev, void *data)
1423 {
1424         struct unit_directory *ud;
1425         struct device_driver *drv;
1426         struct node_entry *ne = (struct node_entry *)data;
1427
1428         ud = container_of(dev, struct unit_directory, unit_dev);
1429         if (ud->ne == ne) {
1430                 drv = get_driver(ud->device.driver);
1431                 if (drv) {
1432                         if (drv->resume) {
1433                                 down(&ud->device.sem);
1434                                 drv->resume(&ud->device);
1435                                 up(&ud->device.sem);
1436                         }
1437                         put_driver(drv);
1438                 }
1439         }
1440
1441         return 0;
1442 }
1443
1444 static void nodemgr_suspend_ne(struct node_entry *ne)
1445 {
1446         HPSB_DEBUG("Node suspended: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1447                    NODE_BUS_ARGS(ne->host, ne->nodeid),
1448                    (unsigned long long)ne->guid);
1449
1450         ne->in_limbo = 1;
1451         WARN_ON(device_create_file(&ne->device, &dev_attr_ne_in_limbo));
1452
1453         class_for_each_device(&nodemgr_ud_class, ne, __nodemgr_driver_suspend);
1454 }
1455
1456
1457 static void nodemgr_resume_ne(struct node_entry *ne)
1458 {
1459         ne->in_limbo = 0;
1460         device_remove_file(&ne->device, &dev_attr_ne_in_limbo);
1461
1462         class_for_each_device(&nodemgr_ud_class, ne, __nodemgr_driver_resume);
1463         HPSB_DEBUG("Node resumed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1464                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1465 }
1466
1467 static int __nodemgr_update_pdrv(struct device *dev, void *data)
1468 {
1469         struct unit_directory *ud;
1470         struct device_driver *drv;
1471         struct hpsb_protocol_driver *pdrv;
1472         struct node_entry *ne = (struct node_entry *)data;
1473         int error;
1474
1475         ud = container_of(dev, struct unit_directory, unit_dev);
1476         if (ud->ne == ne) {
1477                 drv = get_driver(ud->device.driver);
1478                 if (drv) {
1479                         error = 0;
1480                         pdrv = container_of(drv, struct hpsb_protocol_driver,
1481                                             driver);
1482                         if (pdrv->update) {
1483                                 down(&ud->device.sem);
1484                                 error = pdrv->update(ud);
1485                                 up(&ud->device.sem);
1486                         }
1487                         if (error)
1488                                 device_release_driver(&ud->device);
1489                         put_driver(drv);
1490                 }
1491         }
1492
1493         return 0;
1494 }
1495
1496 static void nodemgr_update_pdrv(struct node_entry *ne)
1497 {
1498         class_for_each_device(&nodemgr_ud_class, ne, __nodemgr_update_pdrv);
1499 }
1500
1501
1502 /* Write the BROADCAST_CHANNEL as per IEEE1394a 8.3.2.3.11 and 8.4.2.3.  This
1503  * seems like an optional service but in the end it is practically mandatory
1504  * as a consequence of these clauses.
1505  *
1506  * Note that we cannot do a broadcast write to all nodes at once because some
1507  * pre-1394a devices would hang. */
1508 static void nodemgr_irm_write_bc(struct node_entry *ne, int generation)
1509 {
1510         const u64 bc_addr = (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL);
1511         quadlet_t bc_remote, bc_local;
1512         int error;
1513
1514         if (!ne->host->is_irm || ne->generation != generation ||
1515             ne->nodeid == ne->host->node_id)
1516                 return;
1517
1518         bc_local = cpu_to_be32(ne->host->csr.broadcast_channel);
1519
1520         /* Check if the register is implemented and 1394a compliant. */
1521         error = hpsb_read(ne->host, ne->nodeid, generation, bc_addr, &bc_remote,
1522                           sizeof(bc_remote));
1523         if (!error && bc_remote & cpu_to_be32(0x80000000) &&
1524             bc_remote != bc_local)
1525                 hpsb_node_write(ne, bc_addr, &bc_local, sizeof(bc_local));
1526 }
1527
1528
1529 static void nodemgr_probe_ne(struct host_info *hi, struct node_entry *ne, int generation)
1530 {
1531         struct device *dev;
1532
1533         if (ne->host != hi->host || ne->in_limbo)
1534                 return;
1535
1536         dev = get_device(&ne->device);
1537         if (!dev)
1538                 return;
1539
1540         nodemgr_irm_write_bc(ne, generation);
1541
1542         /* If "needs_probe", then this is either a new or changed node we
1543          * rescan totally. If the generation matches for an existing node
1544          * (one that existed prior to the bus reset) we send update calls
1545          * down to the drivers. Otherwise, this is a dead node and we
1546          * suspend it. */
1547         if (ne->needs_probe)
1548                 nodemgr_process_root_directory(hi, ne);
1549         else if (ne->generation == generation)
1550                 nodemgr_update_pdrv(ne);
1551         else
1552                 nodemgr_suspend_ne(ne);
1553
1554         put_device(dev);
1555 }
1556
1557 struct probe_param {
1558         struct host_info *hi;
1559         int generation;
1560 };
1561
1562 static int __nodemgr_node_probe(struct device *dev, void *data)
1563 {
1564         struct probe_param *param = (struct probe_param *)data;
1565         struct node_entry *ne;
1566
1567         ne = container_of(dev, struct node_entry, node_dev);
1568         if (!ne->needs_probe)
1569                 nodemgr_probe_ne(param->hi, ne, param->generation);
1570         if (ne->needs_probe)
1571                 nodemgr_probe_ne(param->hi, ne, param->generation);
1572         return 0;
1573 }
1574
1575 static void nodemgr_node_probe(struct host_info *hi, int generation)
1576 {
1577         struct hpsb_host *host = hi->host;
1578         struct probe_param param;
1579
1580         param.hi = hi;
1581         param.generation = generation;
1582         /* Do some processing of the nodes we've probed. This pulls them
1583          * into the sysfs layer if needed, and can result in processing of
1584          * unit-directories, or just updating the node and it's
1585          * unit-directories.
1586          *
1587          * Run updates before probes. Usually, updates are time-critical
1588          * while probes are time-consuming. (Well, those probes need some
1589          * improvement...) */
1590
1591         class_for_each_device(&nodemgr_ne_class, &param, __nodemgr_node_probe);
1592
1593         /* If we had a bus reset while we were scanning the bus, it is
1594          * possible that we did not probe all nodes.  In that case, we
1595          * skip the clean up for now, since we could remove nodes that
1596          * were still on the bus.  Another bus scan is pending which will
1597          * do the clean up eventually.
1598          *
1599          * Now let's tell the bus to rescan our devices. This may seem
1600          * like overhead, but the driver-model core will only scan a
1601          * device for a driver when either the device is added, or when a
1602          * new driver is added. A bus reset is a good reason to rescan
1603          * devices that were there before.  For example, an sbp2 device
1604          * may become available for login, if the host that held it was
1605          * just removed.  */
1606
1607         if (generation == get_hpsb_generation(host))
1608                 if (bus_rescan_devices(&ieee1394_bus_type))
1609                         HPSB_DEBUG("bus_rescan_devices had an error");
1610 }
1611
1612 static int nodemgr_send_resume_packet(struct hpsb_host *host)
1613 {
1614         struct hpsb_packet *packet;
1615         int error = -ENOMEM;
1616
1617         packet = hpsb_make_phypacket(host,
1618                         EXTPHYPACKET_TYPE_RESUME |
1619                         NODEID_TO_NODE(host->node_id) << PHYPACKET_PORT_SHIFT);
1620         if (packet) {
1621                 packet->no_waiter = 1;
1622                 packet->generation = get_hpsb_generation(host);
1623                 error = hpsb_send_packet(packet);
1624         }
1625         if (error)
1626                 HPSB_WARN("fw-host%d: Failed to broadcast resume packet",
1627                           host->id);
1628         return error;
1629 }
1630
1631 /* Perform a few high-level IRM responsibilities. */
1632 static int nodemgr_do_irm_duties(struct hpsb_host *host, int cycles)
1633 {
1634         quadlet_t bc;
1635
1636         /* if irm_id == -1 then there is no IRM on this bus */
1637         if (!host->is_irm || host->irm_id == (nodeid_t)-1)
1638                 return 1;
1639
1640         /* We are a 1394a-2000 compliant IRM. Set the validity bit. */
1641         host->csr.broadcast_channel |= 0x40000000;
1642
1643         /* If there is no bus manager then we should set the root node's
1644          * force_root bit to promote bus stability per the 1394
1645          * spec. (8.4.2.6) */
1646         if (host->busmgr_id == 0xffff && host->node_count > 1)
1647         {
1648                 u16 root_node = host->node_count - 1;
1649
1650                 /* get cycle master capability flag from root node */
1651                 if (host->is_cycmst ||
1652                     (!hpsb_read(host, LOCAL_BUS | root_node, get_hpsb_generation(host),
1653                                 (CSR_REGISTER_BASE + CSR_CONFIG_ROM + 2 * sizeof(quadlet_t)),
1654                                 &bc, sizeof(quadlet_t)) &&
1655                      be32_to_cpu(bc) & 1 << CSR_CMC_SHIFT))
1656                         hpsb_send_phy_config(host, root_node, -1);
1657                 else {
1658                         HPSB_DEBUG("The root node is not cycle master capable; "
1659                                    "selecting a new root node and resetting...");
1660
1661                         if (cycles >= 5) {
1662                                 /* Oh screw it! Just leave the bus as it is */
1663                                 HPSB_DEBUG("Stopping reset loop for IRM sanity");
1664                                 return 1;
1665                         }
1666
1667                         hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1668                         hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1669
1670                         return 0;
1671                 }
1672         }
1673
1674         /* Some devices suspend their ports while being connected to an inactive
1675          * host adapter, i.e. if connected before the low-level driver is
1676          * loaded.  They become visible either when physically unplugged and
1677          * replugged, or when receiving a resume packet.  Send one once. */
1678         if (!host->resume_packet_sent && !nodemgr_send_resume_packet(host))
1679                 host->resume_packet_sent = 1;
1680
1681         return 1;
1682 }
1683
1684 /* We need to ensure that if we are not the IRM, that the IRM node is capable of
1685  * everything we can do, otherwise issue a bus reset and try to become the IRM
1686  * ourselves. */
1687 static int nodemgr_check_irm_capability(struct hpsb_host *host, int cycles)
1688 {
1689         quadlet_t bc;
1690         int status;
1691
1692         if (hpsb_disable_irm || host->is_irm)
1693                 return 1;
1694
1695         status = hpsb_read(host, LOCAL_BUS | (host->irm_id),
1696                            get_hpsb_generation(host),
1697                            (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL),
1698                            &bc, sizeof(quadlet_t));
1699
1700         if (status < 0 || !(be32_to_cpu(bc) & 0x80000000)) {
1701                 /* The current irm node does not have a valid BROADCAST_CHANNEL
1702                  * register and we do, so reset the bus with force_root set */
1703                 HPSB_DEBUG("Current remote IRM is not 1394a-2000 compliant, resetting...");
1704
1705                 if (cycles >= 5) {
1706                         /* Oh screw it! Just leave the bus as it is */
1707                         HPSB_DEBUG("Stopping reset loop for IRM sanity");
1708                         return 1;
1709                 }
1710
1711                 hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1712                 hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1713
1714                 return 0;
1715         }
1716
1717         return 1;
1718 }
1719
1720 static int nodemgr_host_thread(void *__hi)
1721 {
1722         struct host_info *hi = (struct host_info *)__hi;
1723         struct hpsb_host *host = hi->host;
1724         unsigned int g, generation = 0;
1725         int i, reset_cycles = 0;
1726
1727         set_freezable();
1728         /* Setup our device-model entries */
1729         nodemgr_create_host_dev_files(host);
1730
1731         for (;;) {
1732                 /* Sleep until next bus reset */
1733                 set_current_state(TASK_INTERRUPTIBLE);
1734                 if (get_hpsb_generation(host) == generation &&
1735                     !kthread_should_stop())
1736                         schedule();
1737                 __set_current_state(TASK_RUNNING);
1738
1739                 /* Thread may have been woken up to freeze or to exit */
1740                 if (try_to_freeze())
1741                         continue;
1742                 if (kthread_should_stop())
1743                         goto exit;
1744
1745                 /* Pause for 1/4 second in 1/16 second intervals,
1746                  * to make sure things settle down. */
1747                 g = get_hpsb_generation(host);
1748                 for (i = 0; i < 4 ; i++) {
1749                         msleep_interruptible(63);
1750                         if (kthread_should_stop())
1751                                 goto exit;
1752
1753                         /* Now get the generation in which the node ID's we collect
1754                          * are valid.  During the bus scan we will use this generation
1755                          * for the read transactions, so that if another reset occurs
1756                          * during the scan the transactions will fail instead of
1757                          * returning bogus data. */
1758                         generation = get_hpsb_generation(host);
1759
1760                         /* If we get a reset before we are done waiting, then
1761                          * start the waiting over again */
1762                         if (generation != g)
1763                                 g = generation, i = 0;
1764                 }
1765
1766                 if (!nodemgr_check_irm_capability(host, reset_cycles) ||
1767                     !nodemgr_do_irm_duties(host, reset_cycles)) {
1768                         reset_cycles++;
1769                         continue;
1770                 }
1771                 reset_cycles = 0;
1772
1773                 /* Scan our nodes to get the bus options and create node
1774                  * entries. This does not do the sysfs stuff, since that
1775                  * would trigger uevents and such, which is a bad idea at
1776                  * this point. */
1777                 nodemgr_node_scan(hi, generation);
1778
1779                 /* This actually does the full probe, with sysfs
1780                  * registration. */
1781                 nodemgr_node_probe(hi, generation);
1782
1783                 /* Update some of our sysfs symlinks */
1784                 nodemgr_update_host_dev_links(host);
1785         }
1786 exit:
1787         HPSB_VERBOSE("NodeMgr: Exiting thread");
1788         return 0;
1789 }
1790
1791 struct host_iter_param {
1792         void *data;
1793         int (*cb)(struct hpsb_host *, void *);
1794 };
1795
1796 static int __nodemgr_for_each_host(struct device *dev, void *data)
1797 {
1798         struct hpsb_host *host;
1799         struct host_iter_param *hip = (struct host_iter_param *)data;
1800         int error = 0;
1801
1802         host = container_of(dev, struct hpsb_host, host_dev);
1803         error = hip->cb(host, hip->data);
1804
1805         return error;
1806 }
1807 /**
1808  * nodemgr_for_each_host - call a function for each IEEE 1394 host
1809  * @data: an address to supply to the callback
1810  * @cb: function to call for each host
1811  *
1812  * Iterate the hosts, calling a given function with supplied data for each host.
1813  * If the callback fails on a host, i.e. if it returns a non-zero value, the
1814  * iteration is stopped.
1815  *
1816  * Return value: 0 on success, non-zero on failure (same as returned by last run
1817  * of the callback).
1818  */
1819 int nodemgr_for_each_host(void *data, int (*cb)(struct hpsb_host *, void *))
1820 {
1821         struct host_iter_param hip;
1822         int error;
1823
1824         hip.cb = cb;
1825         hip.data = data;
1826         error = class_for_each_device(&hpsb_host_class, &hip,
1827                                       __nodemgr_for_each_host);
1828
1829         return error;
1830 }
1831
1832 /* The following two convenience functions use a struct node_entry
1833  * for addressing a node on the bus.  They are intended for use by any
1834  * process context, not just the nodemgr thread, so we need to be a
1835  * little careful when reading out the node ID and generation.  The
1836  * thing that can go wrong is that we get the node ID, then a bus
1837  * reset occurs, and then we read the generation.  The node ID is
1838  * possibly invalid, but the generation is current, and we end up
1839  * sending a packet to a the wrong node.
1840  *
1841  * The solution is to make sure we read the generation first, so that
1842  * if a reset occurs in the process, we end up with a stale generation
1843  * and the transactions will fail instead of silently using wrong node
1844  * ID's.
1845  */
1846
1847 /**
1848  * hpsb_node_fill_packet - fill some destination information into a packet
1849  * @ne: destination node
1850  * @packet: packet to fill in
1851  *
1852  * This will fill in the given, pre-initialised hpsb_packet with the current
1853  * information from the node entry (host, node ID, bus generation number).
1854  */
1855 void hpsb_node_fill_packet(struct node_entry *ne, struct hpsb_packet *packet)
1856 {
1857         packet->host = ne->host;
1858         packet->generation = ne->generation;
1859         barrier();
1860         packet->node_id = ne->nodeid;
1861 }
1862
1863 int hpsb_node_write(struct node_entry *ne, u64 addr,
1864                     quadlet_t *buffer, size_t length)
1865 {
1866         unsigned int generation = ne->generation;
1867
1868         barrier();
1869         return hpsb_write(ne->host, ne->nodeid, generation,
1870                           addr, buffer, length);
1871 }
1872
1873 static void nodemgr_add_host(struct hpsb_host *host)
1874 {
1875         struct host_info *hi;
1876
1877         hi = hpsb_create_hostinfo(&nodemgr_highlevel, host, sizeof(*hi));
1878         if (!hi) {
1879                 HPSB_ERR("NodeMgr: out of memory in add host");
1880                 return;
1881         }
1882         hi->host = host;
1883         hi->thread = kthread_run(nodemgr_host_thread, hi, "knodemgrd_%d",
1884                                  host->id);
1885         if (IS_ERR(hi->thread)) {
1886                 HPSB_ERR("NodeMgr: cannot start thread for host %d", host->id);
1887                 hpsb_destroy_hostinfo(&nodemgr_highlevel, host);
1888         }
1889 }
1890
1891 static void nodemgr_host_reset(struct hpsb_host *host)
1892 {
1893         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1894
1895         if (hi) {
1896                 HPSB_VERBOSE("NodeMgr: Processing reset for host %d", host->id);
1897                 wake_up_process(hi->thread);
1898         }
1899 }
1900
1901 static void nodemgr_remove_host(struct hpsb_host *host)
1902 {
1903         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1904
1905         if (hi) {
1906                 kthread_stop(hi->thread);
1907                 nodemgr_remove_host_dev(&host->device);
1908         }
1909 }
1910
1911 static struct hpsb_highlevel nodemgr_highlevel = {
1912         .name =         "Node manager",
1913         .add_host =     nodemgr_add_host,
1914         .host_reset =   nodemgr_host_reset,
1915         .remove_host =  nodemgr_remove_host,
1916 };
1917
1918 int init_ieee1394_nodemgr(void)
1919 {
1920         int error;
1921
1922         error = class_register(&nodemgr_ne_class);
1923         if (error)
1924                 goto fail_ne;
1925         error = class_register(&nodemgr_ud_class);
1926         if (error)
1927                 goto fail_ud;
1928         error = driver_register(&nodemgr_mid_layer_driver);
1929         if (error)
1930                 goto fail_ml;
1931         /* This driver is not used if nodemgr is off (disable_nodemgr=1). */
1932         nodemgr_dev_template_host.driver = &nodemgr_mid_layer_driver;
1933
1934         hpsb_register_highlevel(&nodemgr_highlevel);
1935         return 0;
1936
1937 fail_ml:
1938         class_unregister(&nodemgr_ud_class);
1939 fail_ud:
1940         class_unregister(&nodemgr_ne_class);
1941 fail_ne:
1942         return error;
1943 }
1944
1945 void cleanup_ieee1394_nodemgr(void)
1946 {
1947         hpsb_unregister_highlevel(&nodemgr_highlevel);
1948         driver_unregister(&nodemgr_mid_layer_driver);
1949         class_unregister(&nodemgr_ud_class);
1950         class_unregister(&nodemgr_ne_class);
1951 }