drivers/ieee1394/nodemgr.c

   1 /*
   2  * Node information (ConfigROM) collection and management.
   3  *
   4  * Copyright (C) 2000           Andreas E. Bombe
   5  *               2001-2003      Ben Collins <bcollins@debian.net>
   6  *
   7  * This code is licensed under the GPL.  See the file COPYING in the root
   8  * directory of the kernel sources for details.
   9  */
  10
  11 #include <linux/bitmap.h>
  12 #include <linux/kernel.h>
  13 #include <linux/list.h>
  14 #include <linux/slab.h>
  15 #include <linux/delay.h>
  16 #include <linux/kthread.h>
  17 #include <linux/module.h>
  18 #include <linux/moduleparam.h>
  19 #include <linux/freezer.h>
  20 #include <asm/atomic.h>
  21
  22 #include "csr.h"
  23 #include "highlevel.h"
  24 #include "hosts.h"
  25 #include "ieee1394.h"
  26 #include "ieee1394_core.h"
  27 #include "ieee1394_hotplug.h"
  28 #include "ieee1394_types.h"
  29 #include "ieee1394_transactions.h"
  30 #include "nodemgr.h"
  31
  32 static int ignore_drivers;
  33 module_param(ignore_drivers, int, S_IRUGO | S_IWUSR);
  34 MODULE_PARM_DESC(ignore_drivers, "Disable automatic probing for drivers.");
  35
  36 struct nodemgr_csr_info {
  37         struct hpsb_host *host;
  38         nodeid_t nodeid;
  39         unsigned int generation;
  40         unsigned int speed_unverified:1;
  41 };
  42
  43
  44 static char *nodemgr_find_oui_name(int oui)
  45 {
  46 #ifdef CONFIG_IEEE1394_OUI_DB
  47         extern struct oui_list_struct {
  48                 int oui;
  49                 char *name;
  50         } oui_list[];
  51         int i;
  52
  53         for (i = 0; oui_list[i].name; i++)
  54                 if (oui_list[i].oui == oui)
  55                         return oui_list[i].name;
  56 #endif
  57         return NULL;
  58 }
  59
  60 /*
  61  * Correct the speed map entry.  This is necessary
  62  *  - for nodes with link speed < phy speed,
  63  *  - for 1394b nodes with negotiated phy port speed < IEEE1394_SPEED_MAX.
  64  * A possible speed is determined by trial and error, using quadlet reads.
  65  */
  66 static int nodemgr_check_speed(struct nodemgr_csr_info *ci, u64 addr,
  67                                quadlet_t *buffer)
  68 {
  69         quadlet_t q;
  70         u8 i, *speed, old_speed, good_speed;
  71         int error;
  72
  73         speed = &(ci->host->speed[NODEID_TO_NODE(ci->nodeid)]);
  74         old_speed = *speed;
  75         good_speed = IEEE1394_SPEED_MAX + 1;
  76
  77         /* Try every speed from S100 to old_speed.
  78          * If we did it the other way around, a too low speed could be caught
  79          * if the retry succeeded for some other reason, e.g. because the link
  80          * just finished its initialization. */
  81         for (i = IEEE1394_SPEED_100; i <= old_speed; i++) {
  82                 *speed = i;
  83                 error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
  84                                   &q, sizeof(quadlet_t));
  85                 if (error)
  86                         break;
  87                 *buffer = q;
  88                 good_speed = i;
  89         }
  90         if (good_speed <= IEEE1394_SPEED_MAX) {
  91                 HPSB_DEBUG("Speed probe of node " NODE_BUS_FMT " yields %s",
  92                            NODE_BUS_ARGS(ci->host, ci->nodeid),
  93                            hpsb_speedto_str[good_speed]);
  94                 *speed = good_speed;
  95                 ci->speed_unverified = 0;
  96                 return 0;
  97         }
  98         *speed = old_speed;
  99         return error;
 100 }
 101
 102 static int nodemgr_bus_read(struct csr1212_csr *csr, u64 addr, u16 length,
 103                             void *buffer, void *__ci)
 104 {
 105         struct nodemgr_csr_info *ci = (struct nodemgr_csr_info*)__ci;
 106         int i, error;
 107
 108         for (i = 1; ; i++) {
 109                 error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
 110                                   buffer, length);
 111                 if (!error) {
 112                         ci->speed_unverified = 0;
 113                         break;
 114                 }
 115                 /* Give up after 3rd failure. */
 116                 if (i == 3)
 117                         break;
 118
 119                 /* The ieee1394_core guessed the node's speed capability from
 120                  * the self ID.  Check whether a lower speed works. */
 121                 if (ci->speed_unverified && length == sizeof(quadlet_t)) {
 122                         error = nodemgr_check_speed(ci, addr, buffer);
 123                         if (!error)
 124                                 break;
 125                 }
 126                 if (msleep_interruptible(334))
 127                         return -EINTR;
 128         }
 129         return error;
 130 }
 131
 132 static int nodemgr_get_max_rom(quadlet_t *bus_info_data, void *__ci)
 133 {
 134         return (CSR1212_BE32_TO_CPU(bus_info_data[2]) >> 8) & 0x3;
 135 }
 136
 137 static struct csr1212_bus_ops nodemgr_csr_ops = {
 138         .bus_read =     nodemgr_bus_read,
 139         .get_max_rom =  nodemgr_get_max_rom
 140 };
 141
 142
 143 /*
 144  * Basically what we do here is start off retrieving the bus_info block.
 145  * From there will fill in some info about the node, verify it is of IEEE
 146  * 1394 type, and that the crc checks out ok. After that we start off with
 147  * the root directory, and subdirectories. To do this, we retrieve the
 148  * quadlet header for a directory, find out the length, and retrieve the
 149  * complete directory entry (be it a leaf or a directory). We then process
 150  * it and add the info to our structure for that particular node.
 151  *
 152  * We verify CRC's along the way for each directory/block/leaf. The entire
 153  * node structure is generic, and simply stores the information in a way
 154  * that's easy to parse by the protocol interface.
 155  */
 156
 157 /*
 158  * The nodemgr relies heavily on the Driver Model for device callbacks and
 159  * driver/device mappings. The old nodemgr used to handle all this itself,
 160  * but now we are much simpler because of the LDM.
 161  */
 162
 163 static DEFINE_MUTEX(nodemgr_serialize);
 164
 165 struct host_info {
 166         struct hpsb_host *host;
 167         struct list_head list;
 168         struct task_struct *thread;
 169 };
 170
 171 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv);
 172 static int nodemgr_uevent(struct class_device *cdev, char **envp, int num_envp,
 173                           char *buffer, int buffer_size);
 174 static void nodemgr_resume_ne(struct node_entry *ne);
 175 static void nodemgr_remove_ne(struct node_entry *ne);
 176 static struct node_entry *find_entry_by_guid(u64 guid);
 177
 178 struct bus_type ieee1394_bus_type = {
 179         .name           = "ieee1394",
 180         .match          = nodemgr_bus_match,
 181 };
 182
 183 static void host_cls_release(struct class_device *class_dev)
 184 {
 185         put_device(&container_of((class_dev), struct hpsb_host, class_dev)->device);
 186 }
 187
 188 struct class hpsb_host_class = {
 189         .name           = "ieee1394_host",
 190         .release        = host_cls_release,
 191 };
 192
 193 static void ne_cls_release(struct class_device *class_dev)
 194 {
 195         put_device(&container_of((class_dev), struct node_entry, class_dev)->device);
 196 }
 197
 198 static struct class nodemgr_ne_class = {
 199         .name           = "ieee1394_node",
 200         .release        = ne_cls_release,
 201 };
 202
 203 static void ud_cls_release(struct class_device *class_dev)
 204 {
 205         put_device(&container_of((class_dev), struct unit_directory, class_dev)->device);
 206 }
 207
 208 /* The name here is only so that unit directory hotplug works with old
 209  * style hotplug, which only ever did unit directories anyway. */
 210 static struct class nodemgr_ud_class = {
 211         .name           = "ieee1394",
 212         .release        = ud_cls_release,
 213         .uevent         = nodemgr_uevent,
 214 };
 215
 216 static struct hpsb_highlevel nodemgr_highlevel;
 217
 218
 219 static void nodemgr_release_ud(struct device *dev)
 220 {
 221         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 222
 223         if (ud->vendor_name_kv)
 224                 csr1212_release_keyval(ud->vendor_name_kv);
 225         if (ud->model_name_kv)
 226                 csr1212_release_keyval(ud->model_name_kv);
 227
 228         kfree(ud);
 229 }
 230
 231 static void nodemgr_release_ne(struct device *dev)
 232 {
 233         struct node_entry *ne = container_of(dev, struct node_entry, device);
 234
 235         if (ne->vendor_name_kv)
 236                 csr1212_release_keyval(ne->vendor_name_kv);
 237
 238         kfree(ne);
 239 }
 240
 241
 242 static void nodemgr_release_host(struct device *dev)
 243 {
 244         struct hpsb_host *host = container_of(dev, struct hpsb_host, device);
 245
 246         csr1212_destroy_csr(host->csr.rom);
 247
 248         kfree(host);
 249 }
 250
 251 static int nodemgr_ud_platform_data;
 252
 253 static struct device nodemgr_dev_template_ud = {
 254         .bus            = &ieee1394_bus_type,
 255         .release        = nodemgr_release_ud,
 256         .platform_data  = &nodemgr_ud_platform_data,
 257 };
 258
 259 static struct device nodemgr_dev_template_ne = {
 260         .bus            = &ieee1394_bus_type,
 261         .release        = nodemgr_release_ne,
 262 };
 263
 264 /* This dummy driver prevents the host devices from being scanned. We have no
 265  * useful drivers for them yet, and there would be a deadlock possible if the
 266  * driver core scans the host device while the host's low-level driver (i.e.
 267  * the host's parent device) is being removed. */
 268 static struct device_driver nodemgr_mid_layer_driver = {
 269         .bus            = &ieee1394_bus_type,
 270         .name           = "nodemgr",
 271         .owner          = THIS_MODULE,
 272 };
 273
 274 struct device nodemgr_dev_template_host = {
 275         .bus            = &ieee1394_bus_type,
 276         .release        = nodemgr_release_host,
 277 };
 278
 279
 280 #define fw_attr(class, class_type, field, type, format_string)          \
 281 static ssize_t fw_show_##class##_##field (struct device *dev, struct device_attribute *attr, char *buf)\
 282 {                                                                       \
 283         class_type *class;                                              \
 284         class = container_of(dev, class_type, device);                  \
 285         return sprintf(buf, format_string, (type)class->field);         \
 286 }                                                                       \
 287 static struct device_attribute dev_attr_##class##_##field = {           \
 288         .attr = {.name = __stringify(field), .mode = S_IRUGO },         \
 289         .show   = fw_show_##class##_##field,                            \
 290 };
 291
 292 #define fw_attr_td(class, class_type, td_kv)                            \
 293 static ssize_t fw_show_##class##_##td_kv (struct device *dev, struct device_attribute *attr, char *buf)\
 294 {                                                                       \
 295         int len;                                                        \
 296         class_type *class = container_of(dev, class_type, device);      \
 297         len = (class->td_kv->value.leaf.len - 2) * sizeof(quadlet_t);   \
 298         memcpy(buf,                                                     \
 299                CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(class->td_kv),      \
 300                len);                                                    \
 301         while ((buf + len - 1) == '\0')                                 \
 302                 len--;                                                  \
 303         buf[len++] = '\n';                                              \
 304         buf[len] = '\0';                                                \
 305         return len;                                                     \
 306 }                                                                       \
 307 static struct device_attribute dev_attr_##class##_##td_kv = {           \
 308         .attr = {.name = __stringify(td_kv), .mode = S_IRUGO },         \
 309         .show   = fw_show_##class##_##td_kv,                            \
 310 };
 311
 312
 313 #define fw_drv_attr(field, type, format_string)                 \
 314 static ssize_t fw_drv_show_##field (struct device_driver *drv, char *buf) \
 315 {                                                               \
 316         struct hpsb_protocol_driver *driver;                    \
 317         driver = container_of(drv, struct hpsb_protocol_driver, driver); \
 318         return sprintf(buf, format_string, (type)driver->field);\
 319 }                                                               \
 320 static struct driver_attribute driver_attr_drv_##field = {      \
 321         .attr = {.name = __stringify(field), .mode = S_IRUGO }, \
 322         .show   = fw_drv_show_##field,                          \
 323 };
 324
 325
 326 static ssize_t fw_show_ne_bus_options(struct device *dev, struct device_attribute *attr, char *buf)
 327 {
 328         struct node_entry *ne = container_of(dev, struct node_entry, device);
 329
 330         return sprintf(buf, "IRMC(%d) CMC(%d) ISC(%d) BMC(%d) PMC(%d) GEN(%d) "
 331                        "LSPD(%d) MAX_REC(%d) MAX_ROM(%d) CYC_CLK_ACC(%d)\n",
 332                        ne->busopt.irmc,
 333                        ne->busopt.cmc, ne->busopt.isc, ne->busopt.bmc,
 334                        ne->busopt.pmc, ne->busopt.generation, ne->busopt.lnkspd,
 335                        ne->busopt.max_rec,
 336                        ne->busopt.max_rom,
 337                        ne->busopt.cyc_clk_acc);
 338 }
 339 static DEVICE_ATTR(bus_options,S_IRUGO,fw_show_ne_bus_options,NULL);
 340
 341
 342 #ifdef HPSB_DEBUG_TLABELS
 343 static ssize_t fw_show_ne_tlabels_free(struct device *dev,
 344                                        struct device_attribute *attr, char *buf)
 345 {
 346         struct node_entry *ne = container_of(dev, struct node_entry, device);
 347         unsigned long flags;
 348         unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
 349         int tf;
 350
 351         spin_lock_irqsave(&hpsb_tlabel_lock, flags);
 352         tf = 64 - bitmap_weight(tp, 64);
 353         spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
 354
 355         return sprintf(buf, "%d\n", tf);
 356 }
 357 static DEVICE_ATTR(tlabels_free,S_IRUGO,fw_show_ne_tlabels_free,NULL);
 358
 359
 360 static ssize_t fw_show_ne_tlabels_mask(struct device *dev,
 361                                        struct device_attribute *attr, char *buf)
 362 {
 363         struct node_entry *ne = container_of(dev, struct node_entry, device);
 364         unsigned long flags;
 365         unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
 366         u64 tm;
 367
 368         spin_lock_irqsave(&hpsb_tlabel_lock, flags);
 369 #if (BITS_PER_LONG <= 32)
 370         tm = ((u64)tp[0] << 32) + tp[1];
 371 #else
 372         tm = tp[0];
 373 #endif
 374         spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
 375
 376         return sprintf(buf, "0x%016llx\n", (unsigned long long)tm);
 377 }
 378 static DEVICE_ATTR(tlabels_mask, S_IRUGO, fw_show_ne_tlabels_mask, NULL);
 379 #endif /* HPSB_DEBUG_TLABELS */
 380
 381
 382 static ssize_t fw_set_ignore_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 383 {
 384         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 385         int state = simple_strtoul(buf, NULL, 10);
 386
 387         if (state == 1) {
 388                 ud->ignore_driver = 1;
 389                 down_write(&ieee1394_bus_type.subsys.rwsem);
 390                 device_release_driver(dev);
 391                 up_write(&ieee1394_bus_type.subsys.rwsem);
 392         } else if (state == 0)
 393                 ud->ignore_driver = 0;
 394
 395         return count;
 396 }
 397 static ssize_t fw_get_ignore_driver(struct device *dev, struct device_attribute *attr, char *buf)
 398 {
 399         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 400
 401         return sprintf(buf, "%d\n", ud->ignore_driver);
 402 }
 403 static DEVICE_ATTR(ignore_driver, S_IWUSR | S_IRUGO, fw_get_ignore_driver, fw_set_ignore_driver);
 404
 405
 406 static ssize_t fw_set_destroy_node(struct bus_type *bus, const char *buf, size_t count)
 407 {
 408         struct node_entry *ne;
 409         u64 guid = (u64)simple_strtoull(buf, NULL, 16);
 410
 411         ne = find_entry_by_guid(guid);
 412
 413         if (ne == NULL || !ne->in_limbo)
 414                 return -EINVAL;
 415
 416         nodemgr_remove_ne(ne);
 417
 418         return count;
 419 }
 420 static ssize_t fw_get_destroy_node(struct bus_type *bus, char *buf)
 421 {
 422         return sprintf(buf, "You can destroy in_limbo nodes by writing their GUID to this file\n");
 423 }
 424 static BUS_ATTR(destroy_node, S_IWUSR | S_IRUGO, fw_get_destroy_node, fw_set_destroy_node);
 425
 426
 427 static ssize_t fw_set_rescan(struct bus_type *bus, const char *buf,
 428                              size_t count)
 429 {
 430         int error = 0;
 431
 432         if (simple_strtoul(buf, NULL, 10) == 1)
 433                 error = bus_rescan_devices(&ieee1394_bus_type);
 434         return error ? error : count;
 435 }
 436 static ssize_t fw_get_rescan(struct bus_type *bus, char *buf)
 437 {
 438         return sprintf(buf, "You can force a rescan of the bus for "
 439                         "drivers by writing a 1 to this file\n");
 440 }
 441 static BUS_ATTR(rescan, S_IWUSR | S_IRUGO, fw_get_rescan, fw_set_rescan);
 442
 443
 444 static ssize_t fw_set_ignore_drivers(struct bus_type *bus, const char *buf, size_t count)
 445 {
 446         int state = simple_strtoul(buf, NULL, 10);
 447
 448         if (state == 1)
 449                 ignore_drivers = 1;
 450         else if (state == 0)
 451                 ignore_drivers = 0;
 452
 453         return count;
 454 }
 455 static ssize_t fw_get_ignore_drivers(struct bus_type *bus, char *buf)
 456 {
 457         return sprintf(buf, "%d\n", ignore_drivers);
 458 }
 459 static BUS_ATTR(ignore_drivers, S_IWUSR | S_IRUGO, fw_get_ignore_drivers, fw_set_ignore_drivers);
 460
 461
 462 struct bus_attribute *const fw_bus_attrs[] = {
 463         &bus_attr_destroy_node,
 464         &bus_attr_rescan,
 465         &bus_attr_ignore_drivers,
 466         NULL
 467 };
 468
 469
 470 fw_attr(ne, struct node_entry, capabilities, unsigned int, "0x%06x\n")
 471 fw_attr(ne, struct node_entry, nodeid, unsigned int, "0x%04x\n")
 472
 473 fw_attr(ne, struct node_entry, vendor_id, unsigned int, "0x%06x\n")
 474 fw_attr_td(ne, struct node_entry, vendor_name_kv)
 475 fw_attr(ne, struct node_entry, vendor_oui, const char *, "%s\n")
 476
 477 fw_attr(ne, struct node_entry, guid, unsigned long long, "0x%016Lx\n")
 478 fw_attr(ne, struct node_entry, guid_vendor_id, unsigned int, "0x%06x\n")
 479 fw_attr(ne, struct node_entry, guid_vendor_oui, const char *, "%s\n")
 480 fw_attr(ne, struct node_entry, in_limbo, int, "%d\n");
 481
 482 static struct device_attribute *const fw_ne_attrs[] = {
 483         &dev_attr_ne_guid,
 484         &dev_attr_ne_guid_vendor_id,
 485         &dev_attr_ne_capabilities,
 486         &dev_attr_ne_vendor_id,
 487         &dev_attr_ne_nodeid,
 488         &dev_attr_bus_options,
 489 #ifdef HPSB_DEBUG_TLABELS
 490         &dev_attr_tlabels_free,
 491         &dev_attr_tlabels_mask,
 492 #endif
 493 };
 494
 495
 496
 497 fw_attr(ud, struct unit_directory, address, unsigned long long, "0x%016Lx\n")
 498 fw_attr(ud, struct unit_directory, length, int, "%d\n")
 499 /* These are all dependent on the value being provided */
 500 fw_attr(ud, struct unit_directory, vendor_id, unsigned int, "0x%06x\n")
 501 fw_attr(ud, struct unit_directory, model_id, unsigned int, "0x%06x\n")
 502 fw_attr(ud, struct unit_directory, specifier_id, unsigned int, "0x%06x\n")
 503 fw_attr(ud, struct unit_directory, version, unsigned int, "0x%06x\n")
 504 fw_attr_td(ud, struct unit_directory, vendor_name_kv)
 505 fw_attr(ud, struct unit_directory, vendor_oui, const char *, "%s\n")
 506 fw_attr_td(ud, struct unit_directory, model_name_kv)
 507
 508 static struct device_attribute *const fw_ud_attrs[] = {
 509         &dev_attr_ud_address,
 510         &dev_attr_ud_length,
 511         &dev_attr_ignore_driver,
 512 };
 513
 514
 515 fw_attr(host, struct hpsb_host, node_count, int, "%d\n")
 516 fw_attr(host, struct hpsb_host, selfid_count, int, "%d\n")
 517 fw_attr(host, struct hpsb_host, nodes_active, int, "%d\n")
 518 fw_attr(host, struct hpsb_host, in_bus_reset, int, "%d\n")
 519 fw_attr(host, struct hpsb_host, is_root, int, "%d\n")
 520 fw_attr(host, struct hpsb_host, is_cycmst, int, "%d\n")
 521 fw_attr(host, struct hpsb_host, is_irm, int, "%d\n")
 522 fw_attr(host, struct hpsb_host, is_busmgr, int, "%d\n")
 523
 524 static struct device_attribute *const fw_host_attrs[] = {
 525         &dev_attr_host_node_count,
 526         &dev_attr_host_selfid_count,
 527         &dev_attr_host_nodes_active,
 528         &dev_attr_host_in_bus_reset,
 529         &dev_attr_host_is_root,
 530         &dev_attr_host_is_cycmst,
 531         &dev_attr_host_is_irm,
 532         &dev_attr_host_is_busmgr,
 533 };
 534
 535
 536 static ssize_t fw_show_drv_device_ids(struct device_driver *drv, char *buf)
 537 {
 538         struct hpsb_protocol_driver *driver;
 539         struct ieee1394_device_id *id;
 540         int length = 0;
 541         char *scratch = buf;
 542
 543         driver = container_of(drv, struct hpsb_protocol_driver, driver);
 544
 545         for (id = driver->id_table; id->match_flags != 0; id++) {
 546                 int need_coma = 0;
 547
 548                 if (id->match_flags & IEEE1394_MATCH_VENDOR_ID) {
 549                         length += sprintf(scratch, "vendor_id=0x%06x", id->vendor_id);
 550                         scratch = buf + length;
 551                         need_coma++;
 552                 }
 553
 554                 if (id->match_flags & IEEE1394_MATCH_MODEL_ID) {
 555                         length += sprintf(scratch, "%smodel_id=0x%06x",
 556                                           need_coma++ ? "," : "",
 557                                           id->model_id);
 558                         scratch = buf + length;
 559                 }
 560
 561                 if (id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) {
 562                         length += sprintf(scratch, "%sspecifier_id=0x%06x",
 563                                           need_coma++ ? "," : "",
 564                                           id->specifier_id);
 565                         scratch = buf + length;
 566                 }
 567
 568                 if (id->match_flags & IEEE1394_MATCH_VERSION) {
 569                         length += sprintf(scratch, "%sversion=0x%06x",
 570                                           need_coma++ ? "," : "",
 571                                           id->version);
 572                         scratch = buf + length;
 573                 }
 574
 575                 if (need_coma) {
 576                         *scratch++ = '\n';
 577                         length++;
 578                 }
 579         }
 580
 581         return length;
 582 }
 583 static DRIVER_ATTR(device_ids,S_IRUGO,fw_show_drv_device_ids,NULL);
 584
 585
 586 fw_drv_attr(name, const char *, "%s\n")
 587
 588 static struct driver_attribute *const fw_drv_attrs[] = {
 589         &driver_attr_drv_name,
 590         &driver_attr_device_ids,
 591 };
 592
 593
 594 static void nodemgr_create_drv_files(struct hpsb_protocol_driver *driver)
 595 {
 596         struct device_driver *drv = &driver->driver;
 597         int i;
 598
 599         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
 600                 if (driver_create_file(drv, fw_drv_attrs[i]))
 601                         goto fail;
 602         return;
 603 fail:
 604         HPSB_ERR("Failed to add sysfs attribute for driver %s", driver->name);
 605 }
 606
 607
 608 static void nodemgr_remove_drv_files(struct hpsb_protocol_driver *driver)
 609 {
 610         struct device_driver *drv = &driver->driver;
 611         int i;
 612
 613         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
 614                 driver_remove_file(drv, fw_drv_attrs[i]);
 615 }
 616
 617
 618 static void nodemgr_create_ne_dev_files(struct node_entry *ne)
 619 {
 620         struct device *dev = &ne->device;
 621         int i;
 622
 623         for (i = 0; i < ARRAY_SIZE(fw_ne_attrs); i++)
 624                 if (device_create_file(dev, fw_ne_attrs[i]))
 625                         goto fail;
 626         return;
 627 fail:
 628         HPSB_ERR("Failed to add sysfs attribute for node %016Lx",
 629                  (unsigned long long)ne->guid);
 630 }
 631
 632
 633 static void nodemgr_create_host_dev_files(struct hpsb_host *host)
 634 {
 635         struct device *dev = &host->device;
 636         int i;
 637
 638         for (i = 0; i < ARRAY_SIZE(fw_host_attrs); i++)
 639                 if (device_create_file(dev, fw_host_attrs[i]))
 640                         goto fail;
 641         return;
 642 fail:
 643         HPSB_ERR("Failed to add sysfs attribute for host %d", host->id);
 644 }
 645
 646
 647 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
 648                                                nodeid_t nodeid);
 649
 650 static void nodemgr_update_host_dev_links(struct hpsb_host *host)
 651 {
 652         struct device *dev = &host->device;
 653         struct node_entry *ne;
 654
 655         sysfs_remove_link(&dev->kobj, "irm_id");
 656         sysfs_remove_link(&dev->kobj, "busmgr_id");
 657         sysfs_remove_link(&dev->kobj, "host_id");
 658
 659         if ((ne = find_entry_by_nodeid(host, host->irm_id)) &&
 660             sysfs_create_link(&dev->kobj, &ne->device.kobj, "irm_id"))
 661                 goto fail;
 662         if ((ne = find_entry_by_nodeid(host, host->busmgr_id)) &&
 663             sysfs_create_link(&dev->kobj, &ne->device.kobj, "busmgr_id"))
 664                 goto fail;
 665         if ((ne = find_entry_by_nodeid(host, host->node_id)) &&
 666             sysfs_create_link(&dev->kobj, &ne->device.kobj, "host_id"))
 667                 goto fail;
 668         return;
 669 fail:
 670         HPSB_ERR("Failed to update sysfs attributes for host %d", host->id);
 671 }
 672
 673 static void nodemgr_create_ud_dev_files(struct unit_directory *ud)
 674 {
 675         struct device *dev = &ud->device;
 676         int i;
 677
 678         for (i = 0; i < ARRAY_SIZE(fw_ud_attrs); i++)
 679                 if (device_create_file(dev, fw_ud_attrs[i]))
 680                         goto fail;
 681         if (ud->flags & UNIT_DIRECTORY_SPECIFIER_ID)
 682                 if (device_create_file(dev, &dev_attr_ud_specifier_id))
 683                         goto fail;
 684         if (ud->flags & UNIT_DIRECTORY_VERSION)
 685                 if (device_create_file(dev, &dev_attr_ud_version))
 686                         goto fail;
 687         if (ud->flags & UNIT_DIRECTORY_VENDOR_ID) {
 688                 if (device_create_file(dev, &dev_attr_ud_vendor_id))
 689                         goto fail;
 690                 if (ud->vendor_name_kv &&
 691                     device_create_file(dev, &dev_attr_ud_vendor_name_kv))
 692                         goto fail;
 693         }
 694         if (ud->flags & UNIT_DIRECTORY_MODEL_ID) {
 695                 if (device_create_file(dev, &dev_attr_ud_model_id))
 696                         goto fail;
 697                 if (ud->model_name_kv &&
 698                     device_create_file(dev, &dev_attr_ud_model_name_kv))
 699                         goto fail;
 700         }
 701         return;
 702 fail:
 703         HPSB_ERR("Failed to add sysfs attributes for unit %s",
 704                  ud->device.bus_id);
 705 }
 706
 707
 708 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv)
 709 {
 710         struct hpsb_protocol_driver *driver;
 711         struct unit_directory *ud;
 712         struct ieee1394_device_id *id;
 713
 714         /* We only match unit directories */
 715         if (dev->platform_data != &nodemgr_ud_platform_data)
 716                 return 0;
 717
 718         ud = container_of(dev, struct unit_directory, device);
 719         if (ud->ne->in_limbo || ud->ignore_driver)
 720                 return 0;
 721
 722         /* We only match drivers of type hpsb_protocol_driver */
 723         if (drv == &nodemgr_mid_layer_driver)
 724                 return 0;
 725
 726         driver = container_of(drv, struct hpsb_protocol_driver, driver);
 727         for (id = driver->id_table; id->match_flags != 0; id++) {
 728                 if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) &&
 729                     id->vendor_id != ud->vendor_id)
 730                         continue;
 731
 732                 if ((id->match_flags & IEEE1394_MATCH_MODEL_ID) &&
 733                     id->model_id != ud->model_id)
 734                         continue;
 735
 736                 if ((id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) &&
 737                     id->specifier_id != ud->specifier_id)
 738                         continue;
 739
 740                 if ((id->match_flags & IEEE1394_MATCH_VERSION) &&
 741                     id->version != ud->version)
 742                         continue;
 743
 744                 return 1;
 745         }
 746
 747         return 0;
 748 }
 749
 750
 751 static DEFINE_MUTEX(nodemgr_serialize_remove_uds);
 752
 753 static void nodemgr_remove_uds(struct node_entry *ne)
 754 {
 755         struct class_device *cdev;
 756         struct unit_directory *tmp, *ud;
 757
 758         /* Iteration over nodemgr_ud_class.children has to be protected by
 759          * nodemgr_ud_class.sem, but class_device_unregister() will eventually
 760          * take nodemgr_ud_class.sem too. Therefore pick out one ud at a time,
 761          * release the semaphore, and then unregister the ud. Since this code
 762          * may be called from other contexts besides the knodemgrds, protect the
 763          * gap after release of the semaphore by nodemgr_serialize_remove_uds.
 764          */
 765         mutex_lock(&nodemgr_serialize_remove_uds);
 766         for (;;) {
 767                 ud = NULL;
 768                 down(&nodemgr_ud_class.sem);
 769                 list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
 770                         tmp = container_of(cdev, struct unit_directory,
 771                                            class_dev);
 772                         if (tmp->ne == ne) {
 773                                 ud = tmp;
 774                                 break;
 775                         }
 776                 }
 777                 up(&nodemgr_ud_class.sem);
 778                 if (ud == NULL)
 779                         break;
 780                 class_device_unregister(&ud->class_dev);
 781                 device_unregister(&ud->device);
 782         }
 783         mutex_unlock(&nodemgr_serialize_remove_uds);
 784 }
 785
 786
 787 static void nodemgr_remove_ne(struct node_entry *ne)
 788 {
 789         struct device *dev;
 790
 791         dev = get_device(&ne->device);
 792         if (!dev)
 793                 return;
 794
 795         HPSB_DEBUG("Node removed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 796                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
 797
 798         nodemgr_remove_uds(ne);
 799
 800         class_device_unregister(&ne->class_dev);
 801         device_unregister(dev);
 802
 803         put_device(dev);
 804 }
 805
 806 static int __nodemgr_remove_host_dev(struct device *dev, void *data)
 807 {
 808         nodemgr_remove_ne(container_of(dev, struct node_entry, device));
 809         return 0;
 810 }
 811
 812 static void nodemgr_remove_host_dev(struct device *dev)
 813 {
 814         WARN_ON(device_for_each_child(dev, NULL, __nodemgr_remove_host_dev));
 815         sysfs_remove_link(&dev->kobj, "irm_id");
 816         sysfs_remove_link(&dev->kobj, "busmgr_id");
 817         sysfs_remove_link(&dev->kobj, "host_id");
 818 }
 819
 820
 821 static void nodemgr_update_bus_options(struct node_entry *ne)
 822 {
 823 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
 824         static const u16 mr[] = { 4, 64, 1024, 0};
 825 #endif
 826         quadlet_t busoptions = be32_to_cpu(ne->csr->bus_info_data[2]);
 827
 828         ne->busopt.irmc         = (busoptions >> 31) & 1;
 829         ne->busopt.cmc          = (busoptions >> 30) & 1;
 830         ne->busopt.isc          = (busoptions >> 29) & 1;
 831         ne->busopt.bmc          = (busoptions >> 28) & 1;
 832         ne->busopt.pmc          = (busoptions >> 27) & 1;
 833         ne->busopt.cyc_clk_acc  = (busoptions >> 16) & 0xff;
 834         ne->busopt.max_rec      = 1 << (((busoptions >> 12) & 0xf) + 1);
 835         ne->busopt.max_rom      = (busoptions >> 8) & 0x3;
 836         ne->busopt.generation   = (busoptions >> 4) & 0xf;
 837         ne->busopt.lnkspd       = busoptions & 0x7;
 838
 839         HPSB_VERBOSE("NodeMgr: raw=0x%08x irmc=%d cmc=%d isc=%d bmc=%d pmc=%d "
 840                      "cyc_clk_acc=%d max_rec=%d max_rom=%d gen=%d lspd=%d",
 841                      busoptions, ne->busopt.irmc, ne->busopt.cmc,
 842                      ne->busopt.isc, ne->busopt.bmc, ne->busopt.pmc,
 843                      ne->busopt.cyc_clk_acc, ne->busopt.max_rec,
 844                      mr[ne->busopt.max_rom],
 845                      ne->busopt.generation, ne->busopt.lnkspd);
 846 }
 847
 848
 849 static struct node_entry *nodemgr_create_node(octlet_t guid, struct csr1212_csr *csr,
 850                                               struct host_info *hi, nodeid_t nodeid,
 851                                               unsigned int generation)
 852 {
 853         struct hpsb_host *host = hi->host;
 854         struct node_entry *ne;
 855
 856         ne = kzalloc(sizeof(*ne), GFP_KERNEL);
 857         if (!ne)
 858                 goto fail_alloc;
 859
 860         ne->host = host;
 861         ne->nodeid = nodeid;
 862         ne->generation = generation;
 863         ne->needs_probe = 1;
 864
 865         ne->guid = guid;
 866         ne->guid_vendor_id = (guid >> 40) & 0xffffff;
 867         ne->guid_vendor_oui = nodemgr_find_oui_name(ne->guid_vendor_id);
 868         ne->csr = csr;
 869
 870         memcpy(&ne->device, &nodemgr_dev_template_ne,
 871                sizeof(ne->device));
 872         ne->device.parent = &host->device;
 873         snprintf(ne->device.bus_id, BUS_ID_SIZE, "%016Lx",
 874                  (unsigned long long)(ne->guid));
 875
 876         ne->class_dev.dev = &ne->device;
 877         ne->class_dev.class = &nodemgr_ne_class;
 878         snprintf(ne->class_dev.class_id, BUS_ID_SIZE, "%016Lx",
 879                  (unsigned long long)(ne->guid));
 880
 881         if (device_register(&ne->device))
 882                 goto fail_devreg;
 883         if (class_device_register(&ne->class_dev))
 884                 goto fail_classdevreg;
 885         get_device(&ne->device);
 886
 887         if (ne->guid_vendor_oui &&
 888             device_create_file(&ne->device, &dev_attr_ne_guid_vendor_oui))
 889                 goto fail_addoiu;
 890         nodemgr_create_ne_dev_files(ne);
 891
 892         nodemgr_update_bus_options(ne);
 893
 894         HPSB_DEBUG("%s added: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 895                    (host->node_id == nodeid) ? "Host" : "Node",
 896                    NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
 897
 898         return ne;
 899
 900 fail_addoiu:
 901         put_device(&ne->device);
 902 fail_classdevreg:
 903         device_unregister(&ne->device);
 904 fail_devreg:
 905         kfree(ne);
 906 fail_alloc:
 907         HPSB_ERR("Failed to create node ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 908                  NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
 909
 910         return NULL;
 911 }
 912
 913
 914 static struct node_entry *find_entry_by_guid(u64 guid)
 915 {
 916         struct class_device *cdev;
 917         struct node_entry *ne, *ret_ne = NULL;
 918
 919         down(&nodemgr_ne_class.sem);
 920         list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
 921                 ne = container_of(cdev, struct node_entry, class_dev);
 922
 923                 if (ne->guid == guid) {
 924                         ret_ne = ne;
 925                         break;
 926                 }
 927         }
 928         up(&nodemgr_ne_class.sem);
 929
 930         return ret_ne;
 931 }
 932
 933
 934 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
 935                                                nodeid_t nodeid)
 936 {
 937         struct class_device *cdev;
 938         struct node_entry *ne, *ret_ne = NULL;
 939
 940         down(&nodemgr_ne_class.sem);
 941         list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
 942                 ne = container_of(cdev, struct node_entry, class_dev);
 943
 944                 if (ne->host == host && ne->nodeid == nodeid) {
 945                         ret_ne = ne;
 946                         break;
 947                 }
 948         }
 949         up(&nodemgr_ne_class.sem);
 950
 951         return ret_ne;
 952 }
 953
 954
 955 static void nodemgr_register_device(struct node_entry *ne,
 956         struct unit_directory *ud, struct device *parent)
 957 {
 958         memcpy(&ud->device, &nodemgr_dev_template_ud,
 959                sizeof(ud->device));
 960
 961         ud->device.parent = parent;
 962
 963         snprintf(ud->device.bus_id, BUS_ID_SIZE, "%s-%u",
 964                  ne->device.bus_id, ud->id);
 965
 966         ud->class_dev.dev = &ud->device;
 967         ud->class_dev.class = &nodemgr_ud_class;
 968         snprintf(ud->class_dev.class_id, BUS_ID_SIZE, "%s-%u",
 969                  ne->device.bus_id, ud->id);
 970
 971         if (device_register(&ud->device))
 972                 goto fail_devreg;
 973         if (class_device_register(&ud->class_dev))
 974                 goto fail_classdevreg;
 975         get_device(&ud->device);
 976
 977         if (ud->vendor_oui &&
 978             device_create_file(&ud->device, &dev_attr_ud_vendor_oui))
 979                 goto fail_addoui;
 980         nodemgr_create_ud_dev_files(ud);
 981
 982         return;
 983
 984 fail_addoui:
 985         put_device(&ud->device);
 986 fail_classdevreg:
 987         device_unregister(&ud->device);
 988 fail_devreg:
 989         HPSB_ERR("Failed to create unit %s", ud->device.bus_id);
 990 }
 991
 992
 993 /* This implementation currently only scans the config rom and its
 994  * immediate unit directories looking for software_id and
 995  * software_version entries, in order to get driver autoloading working. */
 996 static struct unit_directory *nodemgr_process_unit_directory
 997         (struct host_info *hi, struct node_entry *ne, struct csr1212_keyval *ud_kv,
 998          unsigned int *id, struct unit_directory *parent)
 999 {
1000         struct unit_directory *ud;
1001         struct unit_directory *ud_child = NULL;
1002         struct csr1212_dentry *dentry;
1003         struct csr1212_keyval *kv;
1004         u8 last_key_id = 0;
1005
1006         ud = kzalloc(sizeof(*ud), GFP_KERNEL);
1007         if (!ud)
1008                 goto unit_directory_error;
1009
1010         ud->ne = ne;
1011         ud->ignore_driver = ignore_drivers;
1012         ud->address = ud_kv->offset + CSR1212_CONFIG_ROM_SPACE_BASE;
1013         ud->ud_kv = ud_kv;
1014         ud->id = (*id)++;
1015
1016         csr1212_for_each_dir_entry(ne->csr, kv, ud_kv, dentry) {
1017                 switch (kv->key.id) {
1018                 case CSR1212_KV_ID_VENDOR:
1019                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
1020                                 ud->vendor_id = kv->value.immediate;
1021                                 ud->flags |= UNIT_DIRECTORY_VENDOR_ID;
1022
1023                                 if (ud->vendor_id)
1024                                         ud->vendor_oui = nodemgr_find_oui_name(ud->vendor_id);
1025                         }
1026                         break;
1027
1028                 case CSR1212_KV_ID_MODEL:
1029                         ud->model_id = kv->value.immediate;
1030                         ud->flags |= UNIT_DIRECTORY_MODEL_ID;
1031                         break;
1032
1033                 case CSR1212_KV_ID_SPECIFIER_ID:
1034                         ud->specifier_id = kv->value.immediate;
1035                         ud->flags |= UNIT_DIRECTORY_SPECIFIER_ID;
1036                         break;
1037
1038                 case CSR1212_KV_ID_VERSION:
1039                         ud->version = kv->value.immediate;
1040                         ud->flags |= UNIT_DIRECTORY_VERSION;
1041                         break;
1042
1043                 case CSR1212_KV_ID_DESCRIPTOR:
1044                         if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1045                             CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1046                             CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1047                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1048                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1049                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1050                                 switch (last_key_id) {
1051                                 case CSR1212_KV_ID_VENDOR:
1052                                         ud->vendor_name_kv = kv;
1053                                         csr1212_keep_keyval(kv);
1054                                         break;
1055
1056                                 case CSR1212_KV_ID_MODEL:
1057                                         ud->model_name_kv = kv;
1058                                         csr1212_keep_keyval(kv);
1059                                         break;
1060
1061                                 }
1062                         } /* else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) ... */
1063                         break;
1064
1065                 case CSR1212_KV_ID_DEPENDENT_INFO:
1066                         /* Logical Unit Number */
1067                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
1068                                 if (ud->flags & UNIT_DIRECTORY_HAS_LUN) {
1069                                         ud_child = kmemdup(ud, sizeof(*ud_child), GFP_KERNEL);
1070                                         if (!ud_child)
1071                                                 goto unit_directory_error;
1072                                         nodemgr_register_device(ne, ud_child, &ne->device);
1073                                         ud_child = NULL;
1074
1075                                         ud->id = (*id)++;
1076                                 }
1077                                 ud->lun = kv->value.immediate;
1078                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN;
1079
1080                         /* Logical Unit Directory */
1081                         } else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) {
1082                                 /* This should really be done in SBP2 as this is
1083                                  * doing SBP2 specific parsing.
1084                                  */
1085
1086                                 /* first register the parent unit */
1087                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN_DIRECTORY;
1088                                 if (ud->device.bus != &ieee1394_bus_type)
1089                                         nodemgr_register_device(ne, ud, &ne->device);
1090
1091                                 /* process the child unit */
1092                                 ud_child = nodemgr_process_unit_directory(hi, ne, kv, id, ud);
1093
1094                                 if (ud_child == NULL)
1095                                         break;
1096
1097                                 /* inherit unspecified values, the driver core picks it up */
1098                                 if ((ud->flags & UNIT_DIRECTORY_MODEL_ID) &&
1099                                     !(ud_child->flags & UNIT_DIRECTORY_MODEL_ID))
1100                                 {
1101                                         ud_child->flags |=  UNIT_DIRECTORY_MODEL_ID;
1102                                         ud_child->model_id = ud->model_id;
1103                                 }
1104                                 if ((ud->flags & UNIT_DIRECTORY_SPECIFIER_ID) &&
1105                                     !(ud_child->flags & UNIT_DIRECTORY_SPECIFIER_ID))
1106                                 {
1107                                         ud_child->flags |=  UNIT_DIRECTORY_SPECIFIER_ID;
1108                                         ud_child->specifier_id = ud->specifier_id;
1109                                 }
1110                                 if ((ud->flags & UNIT_DIRECTORY_VERSION) &&
1111                                     !(ud_child->flags & UNIT_DIRECTORY_VERSION))
1112                                 {
1113                                         ud_child->flags |=  UNIT_DIRECTORY_VERSION;
1114                                         ud_child->version = ud->version;
1115                                 }
1116
1117                                 /* register the child unit */
1118                                 ud_child->flags |= UNIT_DIRECTORY_LUN_DIRECTORY;
1119                                 nodemgr_register_device(ne, ud_child, &ud->device);
1120                         }
1121
1122                         break;
1123
1124                 default:
1125                         break;
1126                 }
1127                 last_key_id = kv->key.id;
1128         }
1129
1130         /* do not process child units here and only if not already registered */
1131         if (!parent && ud->device.bus != &ieee1394_bus_type)
1132                 nodemgr_register_device(ne, ud, &ne->device);
1133
1134         return ud;
1135
1136 unit_directory_error:
1137         kfree(ud);
1138         return NULL;
1139 }
1140
1141
1142 static void nodemgr_process_root_directory(struct host_info *hi, struct node_entry *ne)
1143 {
1144         unsigned int ud_id = 0;
1145         struct csr1212_dentry *dentry;
1146         struct csr1212_keyval *kv;
1147         u8 last_key_id = 0;
1148
1149         ne->needs_probe = 0;
1150
1151         csr1212_for_each_dir_entry(ne->csr, kv, ne->csr->root_kv, dentry) {
1152                 switch (kv->key.id) {
1153                 case CSR1212_KV_ID_VENDOR:
1154                         ne->vendor_id = kv->value.immediate;
1155
1156                         if (ne->vendor_id)
1157                                 ne->vendor_oui = nodemgr_find_oui_name(ne->vendor_id);
1158                         break;
1159
1160                 case CSR1212_KV_ID_NODE_CAPABILITIES:
1161                         ne->capabilities = kv->value.immediate;
1162                         break;
1163
1164                 case CSR1212_KV_ID_UNIT:
1165                         nodemgr_process_unit_directory(hi, ne, kv, &ud_id, NULL);
1166                         break;
1167
1168                 case CSR1212_KV_ID_DESCRIPTOR:
1169                         if (last_key_id == CSR1212_KV_ID_VENDOR) {
1170                                 if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1171                                     CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1172                                     CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1173                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1174                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1175                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1176                                         ne->vendor_name_kv = kv;
1177                                         csr1212_keep_keyval(kv);
1178                                 }
1179                         }
1180                         break;
1181                 }
1182                 last_key_id = kv->key.id;
1183         }
1184
1185         if (ne->vendor_oui &&
1186             device_create_file(&ne->device, &dev_attr_ne_vendor_oui))
1187                 goto fail;
1188         if (ne->vendor_name_kv &&
1189             device_create_file(&ne->device, &dev_attr_ne_vendor_name_kv))
1190                 goto fail;
1191         return;
1192 fail:
1193         HPSB_ERR("Failed to add sysfs attribute for node %016Lx",
1194                  (unsigned long long)ne->guid);
1195 }
1196
1197 #ifdef CONFIG_HOTPLUG
1198
1199 static int nodemgr_uevent(struct class_device *cdev, char **envp, int num_envp,
1200                           char *buffer, int buffer_size)
1201 {
1202         struct unit_directory *ud;
1203         int i = 0;
1204         int length = 0;
1205         /* ieee1394:venNmoNspNverN */
1206         char buf[8 + 1 + 3 + 8 + 2 + 8 + 2 + 8 + 3 + 8 + 1];
1207
1208         if (!cdev)
1209                 return -ENODEV;
1210
1211         ud = container_of(cdev, struct unit_directory, class_dev);
1212
1213         if (ud->ne->in_limbo || ud->ignore_driver)
1214                 return -ENODEV;
1215
1216 #define PUT_ENVP(fmt,val)                                       \
1217 do {                                                            \
1218         int printed;                                            \
1219         envp[i++] = buffer;                                     \
1220         printed = snprintf(buffer, buffer_size - length,        \
1221                            fmt, val);                           \
1222         if ((buffer_size - (length+printed) <= 0) || (i >= num_envp))   \
1223                 return -ENOMEM;                                 \
1224         length += printed+1;                                    \
1225         buffer += printed+1;                                    \
1226 } while (0)
1227
1228         PUT_ENVP("VENDOR_ID=%06x", ud->vendor_id);
1229         PUT_ENVP("MODEL_ID=%06x", ud->model_id);
1230         PUT_ENVP("GUID=%016Lx", (unsigned long long)ud->ne->guid);
1231         PUT_ENVP("SPECIFIER_ID=%06x", ud->specifier_id);
1232         PUT_ENVP("VERSION=%06x", ud->version);
1233         snprintf(buf, sizeof(buf), "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
1234                         ud->vendor_id,
1235                         ud->model_id,
1236                         ud->specifier_id,
1237                         ud->version);
1238         PUT_ENVP("MODALIAS=%s", buf);
1239
1240 #undef PUT_ENVP
1241
1242         envp[i] = NULL;
1243
1244         return 0;
1245 }
1246
1247 #else
1248
1249 static int nodemgr_uevent(struct class_device *cdev, char **envp, int num_envp,
1250                           char *buffer, int buffer_size)
1251 {
1252         return -ENODEV;
1253 }
1254
1255 #endif /* CONFIG_HOTPLUG */
1256
1257
1258 int __hpsb_register_protocol(struct hpsb_protocol_driver *drv,
1259                              struct module *owner)
1260 {
1261         int error;
1262
1263         drv->driver.bus = &ieee1394_bus_type;
1264         drv->driver.owner = owner;
1265         drv->driver.name = drv->name;
1266
1267         /* This will cause a probe for devices */
1268         error = driver_register(&drv->driver);
1269         if (!error)
1270                 nodemgr_create_drv_files(drv);
1271         return error;
1272 }
1273
1274 void hpsb_unregister_protocol(struct hpsb_protocol_driver *driver)
1275 {
1276         nodemgr_remove_drv_files(driver);
1277         /* This will subsequently disconnect all devices that our driver
1278          * is attached to. */
1279         driver_unregister(&driver->driver);
1280 }
1281
1282
1283 /*
1284  * This function updates nodes that were present on the bus before the
1285  * reset and still are after the reset.  The nodeid and the config rom
1286  * may have changed, and the drivers managing this device must be
1287  * informed that this device just went through a bus reset, to allow
1288  * the to take whatever actions required.
1289  */
1290 static void nodemgr_update_node(struct node_entry *ne, struct csr1212_csr *csr,
1291                                 struct host_info *hi, nodeid_t nodeid,
1292                                 unsigned int generation)
1293 {
1294         if (ne->nodeid != nodeid) {
1295                 HPSB_DEBUG("Node changed: " NODE_BUS_FMT " -> " NODE_BUS_FMT,
1296                            NODE_BUS_ARGS(ne->host, ne->nodeid),
1297                            NODE_BUS_ARGS(ne->host, nodeid));
1298                 ne->nodeid = nodeid;
1299         }
1300
1301         if (ne->busopt.generation != ((be32_to_cpu(csr->bus_info_data[2]) >> 4) & 0xf)) {
1302                 kfree(ne->csr->private);
1303                 csr1212_destroy_csr(ne->csr);
1304                 ne->csr = csr;
1305
1306                 /* If the node's configrom generation has changed, we
1307                  * unregister all the unit directories. */
1308                 nodemgr_remove_uds(ne);
1309
1310                 nodemgr_update_bus_options(ne);
1311
1312                 /* Mark the node as new, so it gets re-probed */
1313                 ne->needs_probe = 1;
1314         } else {
1315                 /* old cache is valid, so update its generation */
1316                 struct nodemgr_csr_info *ci = ne->csr->private;
1317                 ci->generation = generation;
1318                 /* free the partially filled now unneeded new cache */
1319                 kfree(csr->private);
1320                 csr1212_destroy_csr(csr);
1321         }
1322
1323         if (ne->in_limbo)
1324                 nodemgr_resume_ne(ne);
1325
1326         /* Mark the node current */
1327         ne->generation = generation;
1328 }
1329
1330
1331
1332 static void nodemgr_node_scan_one(struct host_info *hi,
1333                                   nodeid_t nodeid, int generation)
1334 {
1335         struct hpsb_host *host = hi->host;
1336         struct node_entry *ne;
1337         octlet_t guid;
1338         struct csr1212_csr *csr;
1339         struct nodemgr_csr_info *ci;
1340         u8 *speed;
1341
1342         ci = kmalloc(sizeof(*ci), GFP_KERNEL);
1343         if (!ci)
1344                 return;
1345
1346         ci->host = host;
1347         ci->nodeid = nodeid;
1348         ci->generation = generation;
1349
1350         /* Prepare for speed probe which occurs when reading the ROM */
1351         speed = &(host->speed[NODEID_TO_NODE(nodeid)]);
1352         if (*speed > host->csr.lnk_spd)
1353                 *speed = host->csr.lnk_spd;
1354         ci->speed_unverified = *speed > IEEE1394_SPEED_100;
1355
1356         /* We need to detect when the ConfigROM's generation has changed,
1357          * so we only update the node's info when it needs to be.  */
1358
1359         csr = csr1212_create_csr(&nodemgr_csr_ops, 5 * sizeof(quadlet_t), ci);
1360         if (!csr || csr1212_parse_csr(csr) != CSR1212_SUCCESS) {
1361                 HPSB_ERR("Error parsing configrom for node " NODE_BUS_FMT,
1362                          NODE_BUS_ARGS(host, nodeid));
1363                 if (csr)
1364                         csr1212_destroy_csr(csr);
1365                 kfree(ci);
1366                 return;
1367         }
1368
1369         if (csr->bus_info_data[1] != IEEE1394_BUSID_MAGIC) {
1370                 /* This isn't a 1394 device, but we let it slide. There
1371                  * was a report of a device with broken firmware which
1372                  * reported '2394' instead of '1394', which is obviously a
1373                  * mistake. One would hope that a non-1394 device never
1374                  * gets connected to Firewire bus. If someone does, we
1375                  * shouldn't be held responsible, so we'll allow it with a
1376                  * warning.  */
1377                 HPSB_WARN("Node " NODE_BUS_FMT " has invalid busID magic [0x%08x]",
1378                           NODE_BUS_ARGS(host, nodeid), csr->bus_info_data[1]);
1379         }
1380
1381         guid = ((u64)be32_to_cpu(csr->bus_info_data[3]) << 32) | be32_to_cpu(csr->bus_info_data[4]);
1382         ne = find_entry_by_guid(guid);
1383
1384         if (ne && ne->host != host && ne->in_limbo) {
1385                 /* Must have moved this device from one host to another */
1386                 nodemgr_remove_ne(ne);
1387                 ne = NULL;
1388         }
1389
1390         if (!ne)
1391                 nodemgr_create_node(guid, csr, hi, nodeid, generation);
1392         else
1393                 nodemgr_update_node(ne, csr, hi, nodeid, generation);
1394 }
1395
1396
1397 static void nodemgr_node_scan(struct host_info *hi, int generation)
1398 {
1399         int count;
1400         struct hpsb_host *host = hi->host;
1401         struct selfid *sid = (struct selfid *)host->topology_map;
1402         nodeid_t nodeid = LOCAL_BUS;
1403
1404         /* Scan each node on the bus */
1405         for (count = host->selfid_count; count; count--, sid++) {
1406                 if (sid->extended)
1407                         continue;
1408
1409                 if (!sid->link_active) {
1410                         nodeid++;
1411                         continue;
1412                 }
1413                 nodemgr_node_scan_one(hi, nodeid++, generation);
1414         }
1415 }
1416
1417
1418 static void nodemgr_suspend_ne(struct node_entry *ne)
1419 {
1420         struct class_device *cdev;
1421         struct unit_directory *ud;
1422
1423         HPSB_DEBUG("Node suspended: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1424                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1425
1426         ne->in_limbo = 1;
1427         WARN_ON(device_create_file(&ne->device, &dev_attr_ne_in_limbo));
1428
1429         down(&nodemgr_ud_class.sem);
1430         list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1431                 ud = container_of(cdev, struct unit_directory, class_dev);
1432                 if (ud->ne != ne)
1433                         continue;
1434
1435                 down_write(&ieee1394_bus_type.subsys.rwsem);
1436                 if (ud->device.driver &&
1437                     (!ud->device.driver->suspend ||
1438                       ud->device.driver->suspend(&ud->device, PMSG_SUSPEND)))
1439                         device_release_driver(&ud->device);
1440                 up_write(&ieee1394_bus_type.subsys.rwsem);
1441         }
1442         up(&nodemgr_ud_class.sem);
1443 }
1444
1445
1446 static void nodemgr_resume_ne(struct node_entry *ne)
1447 {
1448         struct class_device *cdev;
1449         struct unit_directory *ud;
1450
1451         ne->in_limbo = 0;
1452         device_remove_file(&ne->device, &dev_attr_ne_in_limbo);
1453
1454         down(&nodemgr_ud_class.sem);
1455         list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1456                 ud = container_of(cdev, struct unit_directory, class_dev);
1457                 if (ud->ne != ne)
1458                         continue;
1459
1460                 down_read(&ieee1394_bus_type.subsys.rwsem);
1461                 if (ud->device.driver && ud->device.driver->resume)
1462                         ud->device.driver->resume(&ud->device);
1463                 up_read(&ieee1394_bus_type.subsys.rwsem);
1464         }
1465         up(&nodemgr_ud_class.sem);
1466
1467         HPSB_DEBUG("Node resumed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1468                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1469 }
1470
1471
1472 static void nodemgr_update_pdrv(struct node_entry *ne)
1473 {
1474         struct unit_directory *ud;
1475         struct hpsb_protocol_driver *pdrv;
1476         struct class_device *cdev;
1477
1478         down(&nodemgr_ud_class.sem);
1479         list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1480                 ud = container_of(cdev, struct unit_directory, class_dev);
1481                 if (ud->ne != ne)
1482                         continue;
1483
1484                 down_write(&ieee1394_bus_type.subsys.rwsem);
1485                 if (ud->device.driver) {
1486                         pdrv = container_of(ud->device.driver,
1487                                             struct hpsb_protocol_driver,
1488                                             driver);
1489                         if (pdrv->update && pdrv->update(ud))
1490                                 device_release_driver(&ud->device);
1491                 }
1492                 up_write(&ieee1394_bus_type.subsys.rwsem);
1493         }
1494         up(&nodemgr_ud_class.sem);
1495 }
1496
1497
1498 /* Write the BROADCAST_CHANNEL as per IEEE1394a 8.3.2.3.11 and 8.4.2.3.  This
1499  * seems like an optional service but in the end it is practically mandatory
1500  * as a consequence of these clauses.
1501  *
1502  * Note that we cannot do a broadcast write to all nodes at once because some
1503  * pre-1394a devices would hang. */
1504 static void nodemgr_irm_write_bc(struct node_entry *ne, int generation)
1505 {
1506         const u64 bc_addr = (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL);
1507         quadlet_t bc_remote, bc_local;
1508         int error;
1509
1510         if (!ne->host->is_irm || ne->generation != generation ||
1511             ne->nodeid == ne->host->node_id)
1512                 return;
1513
1514         bc_local = cpu_to_be32(ne->host->csr.broadcast_channel);
1515
1516         /* Check if the register is implemented and 1394a compliant. */
1517         error = hpsb_read(ne->host, ne->nodeid, generation, bc_addr, &bc_remote,
1518                           sizeof(bc_remote));
1519         if (!error && bc_remote & cpu_to_be32(0x80000000) &&
1520             bc_remote != bc_local)
1521                 hpsb_node_write(ne, bc_addr, &bc_local, sizeof(bc_local));
1522 }
1523
1524
1525 static void nodemgr_probe_ne(struct host_info *hi, struct node_entry *ne, int generation)
1526 {
1527         struct device *dev;
1528
1529         if (ne->host != hi->host || ne->in_limbo)
1530                 return;
1531
1532         dev = get_device(&ne->device);
1533         if (!dev)
1534                 return;
1535
1536         nodemgr_irm_write_bc(ne, generation);
1537
1538         /* If "needs_probe", then this is either a new or changed node we
1539          * rescan totally. If the generation matches for an existing node
1540          * (one that existed prior to the bus reset) we send update calls
1541          * down to the drivers. Otherwise, this is a dead node and we
1542          * suspend it. */
1543         if (ne->needs_probe)
1544                 nodemgr_process_root_directory(hi, ne);
1545         else if (ne->generation == generation)
1546                 nodemgr_update_pdrv(ne);
1547         else
1548                 nodemgr_suspend_ne(ne);
1549
1550         put_device(dev);
1551 }
1552
1553
1554 static void nodemgr_node_probe(struct host_info *hi, int generation)
1555 {
1556         struct hpsb_host *host = hi->host;
1557         struct class_device *cdev;
1558         struct node_entry *ne;
1559
1560         /* Do some processing of the nodes we've probed. This pulls them
1561          * into the sysfs layer if needed, and can result in processing of
1562          * unit-directories, or just updating the node and it's
1563          * unit-directories.
1564          *
1565          * Run updates before probes. Usually, updates are time-critical
1566          * while probes are time-consuming. (Well, those probes need some
1567          * improvement...) */
1568
1569         down(&nodemgr_ne_class.sem);
1570         list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
1571                 ne = container_of(cdev, struct node_entry, class_dev);
1572                 if (!ne->needs_probe)
1573                         nodemgr_probe_ne(hi, ne, generation);
1574         }
1575         list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
1576                 ne = container_of(cdev, struct node_entry, class_dev);
1577                 if (ne->needs_probe)
1578                         nodemgr_probe_ne(hi, ne, generation);
1579         }
1580         up(&nodemgr_ne_class.sem);
1581
1582
1583         /* If we had a bus reset while we were scanning the bus, it is
1584          * possible that we did not probe all nodes.  In that case, we
1585          * skip the clean up for now, since we could remove nodes that
1586          * were still on the bus.  Another bus scan is pending which will
1587          * do the clean up eventually.
1588          *
1589          * Now let's tell the bus to rescan our devices. This may seem
1590          * like overhead, but the driver-model core will only scan a
1591          * device for a driver when either the device is added, or when a
1592          * new driver is added. A bus reset is a good reason to rescan
1593          * devices that were there before.  For example, an sbp2 device
1594          * may become available for login, if the host that held it was
1595          * just removed.  */
1596
1597         if (generation == get_hpsb_generation(host))
1598                 if (bus_rescan_devices(&ieee1394_bus_type))
1599                         HPSB_DEBUG("bus_rescan_devices had an error");
1600 }
1601
1602 static int nodemgr_send_resume_packet(struct hpsb_host *host)
1603 {
1604         struct hpsb_packet *packet;
1605         int error = -ENOMEM;
1606
1607         packet = hpsb_make_phypacket(host,
1608                         EXTPHYPACKET_TYPE_RESUME |
1609                         NODEID_TO_NODE(host->node_id) << PHYPACKET_PORT_SHIFT);
1610         if (packet) {
1611                 packet->no_waiter = 1;
1612                 packet->generation = get_hpsb_generation(host);
1613                 error = hpsb_send_packet(packet);
1614         }
1615         if (error)
1616                 HPSB_WARN("fw-host%d: Failed to broadcast resume packet",
1617                           host->id);
1618         return error;
1619 }
1620
1621 /* Perform a few high-level IRM responsibilities. */
1622 static int nodemgr_do_irm_duties(struct hpsb_host *host, int cycles)
1623 {
1624         quadlet_t bc;
1625
1626         /* if irm_id == -1 then there is no IRM on this bus */
1627         if (!host->is_irm || host->irm_id == (nodeid_t)-1)
1628                 return 1;
1629
1630         /* We are a 1394a-2000 compliant IRM. Set the validity bit. */
1631         host->csr.broadcast_channel |= 0x40000000;
1632
1633         /* If there is no bus manager then we should set the root node's
1634          * force_root bit to promote bus stability per the 1394
1635          * spec. (8.4.2.6) */
1636         if (host->busmgr_id == 0xffff && host->node_count > 1)
1637         {
1638                 u16 root_node = host->node_count - 1;
1639
1640                 /* get cycle master capability flag from root node */
1641                 if (host->is_cycmst ||
1642                     (!hpsb_read(host, LOCAL_BUS | root_node, get_hpsb_generation(host),
1643                                 (CSR_REGISTER_BASE + CSR_CONFIG_ROM + 2 * sizeof(quadlet_t)),
1644                                 &bc, sizeof(quadlet_t)) &&
1645                      be32_to_cpu(bc) & 1 << CSR_CMC_SHIFT))
1646                         hpsb_send_phy_config(host, root_node, -1);
1647                 else {
1648                         HPSB_DEBUG("The root node is not cycle master capable; "
1649                                    "selecting a new root node and resetting...");
1650
1651                         if (cycles >= 5) {
1652                                 /* Oh screw it! Just leave the bus as it is */
1653                                 HPSB_DEBUG("Stopping reset loop for IRM sanity");
1654                                 return 1;
1655                         }
1656
1657                         hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1658                         hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1659
1660                         return 0;
1661                 }
1662         }
1663
1664         /* Some devices suspend their ports while being connected to an inactive
1665          * host adapter, i.e. if connected before the low-level driver is
1666          * loaded.  They become visible either when physically unplugged and
1667          * replugged, or when receiving a resume packet.  Send one once. */
1668         if (!host->resume_packet_sent && !nodemgr_send_resume_packet(host))
1669                 host->resume_packet_sent = 1;
1670
1671         return 1;
1672 }
1673
1674 /* We need to ensure that if we are not the IRM, that the IRM node is capable of
1675  * everything we can do, otherwise issue a bus reset and try to become the IRM
1676  * ourselves. */
1677 static int nodemgr_check_irm_capability(struct hpsb_host *host, int cycles)
1678 {
1679         quadlet_t bc;
1680         int status;
1681
1682         if (hpsb_disable_irm || host->is_irm)
1683                 return 1;
1684
1685         status = hpsb_read(host, LOCAL_BUS | (host->irm_id),
1686                            get_hpsb_generation(host),
1687                            (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL),
1688                            &bc, sizeof(quadlet_t));
1689
1690         if (status < 0 || !(be32_to_cpu(bc) & 0x80000000)) {
1691                 /* The current irm node does not have a valid BROADCAST_CHANNEL
1692                  * register and we do, so reset the bus with force_root set */
1693                 HPSB_DEBUG("Current remote IRM is not 1394a-2000 compliant, resetting...");
1694
1695                 if (cycles >= 5) {
1696                         /* Oh screw it! Just leave the bus as it is */
1697                         HPSB_DEBUG("Stopping reset loop for IRM sanity");
1698                         return 1;
1699                 }
1700
1701                 hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1702                 hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1703
1704                 return 0;
1705         }
1706
1707         return 1;
1708 }
1709
1710 static int nodemgr_host_thread(void *__hi)
1711 {
1712         struct host_info *hi = (struct host_info *)__hi;
1713         struct hpsb_host *host = hi->host;
1714         unsigned int g, generation = 0;
1715         int i, reset_cycles = 0;
1716
1717         /* Setup our device-model entries */
1718         nodemgr_create_host_dev_files(host);
1719
1720         for (;;) {
1721                 /* Sleep until next bus reset */
1722                 set_current_state(TASK_INTERRUPTIBLE);
1723                 if (get_hpsb_generation(host) == generation)
1724                         schedule();
1725                 __set_current_state(TASK_RUNNING);
1726
1727                 /* Thread may have been woken up to freeze or to exit */
1728                 if (try_to_freeze())
1729                         continue;
1730                 if (kthread_should_stop())
1731                         goto exit;
1732
1733                 if (mutex_lock_interruptible(&nodemgr_serialize)) {
1734                         if (try_to_freeze())
1735                                 continue;
1736                         goto exit;
1737                 }
1738
1739                 /* Pause for 1/4 second in 1/16 second intervals,
1740                  * to make sure things settle down. */
1741                 g = get_hpsb_generation(host);
1742                 for (i = 0; i < 4 ; i++) {
1743                         if (msleep_interruptible(63) || kthread_should_stop())
1744                                 goto unlock_exit;
1745
1746                         /* Now get the generation in which the node ID's we collect
1747                          * are valid.  During the bus scan we will use this generation
1748                          * for the read transactions, so that if another reset occurs
1749                          * during the scan the transactions will fail instead of
1750                          * returning bogus data. */
1751                         generation = get_hpsb_generation(host);
1752
1753                         /* If we get a reset before we are done waiting, then
1754                          * start the the waiting over again */
1755                         if (generation != g)
1756                                 g = generation, i = 0;
1757                 }
1758
1759                 if (!nodemgr_check_irm_capability(host, reset_cycles) ||
1760                     !nodemgr_do_irm_duties(host, reset_cycles)) {
1761                         reset_cycles++;
1762                         mutex_unlock(&nodemgr_serialize);
1763                         continue;
1764                 }
1765                 reset_cycles = 0;
1766
1767                 /* Scan our nodes to get the bus options and create node
1768                  * entries. This does not do the sysfs stuff, since that
1769                  * would trigger uevents and such, which is a bad idea at
1770                  * this point. */
1771                 nodemgr_node_scan(hi, generation);
1772
1773                 /* This actually does the full probe, with sysfs
1774                  * registration. */
1775                 nodemgr_node_probe(hi, generation);
1776
1777                 /* Update some of our sysfs symlinks */
1778                 nodemgr_update_host_dev_links(host);
1779
1780                 mutex_unlock(&nodemgr_serialize);
1781         }
1782 unlock_exit:
1783         mutex_unlock(&nodemgr_serialize);
1784 exit:
1785         HPSB_VERBOSE("NodeMgr: Exiting thread");
1786         return 0;
1787 }
1788
1789 int nodemgr_for_each_host(void *__data, int (*cb)(struct hpsb_host *, void *))
1790 {
1791         struct class_device *cdev;
1792         struct hpsb_host *host;
1793         int error = 0;
1794
1795         down(&hpsb_host_class.sem);
1796         list_for_each_entry(cdev, &hpsb_host_class.children, node) {
1797                 host = container_of(cdev, struct hpsb_host, class_dev);
1798
1799                 if ((error = cb(host, __data)))
1800                         break;
1801         }
1802         up(&hpsb_host_class.sem);
1803
1804         return error;
1805 }
1806
1807 /* The following four convenience functions use a struct node_entry
1808  * for addressing a node on the bus.  They are intended for use by any
1809  * process context, not just the nodemgr thread, so we need to be a
1810  * little careful when reading out the node ID and generation.  The
1811  * thing that can go wrong is that we get the node ID, then a bus
1812  * reset occurs, and then we read the generation.  The node ID is
1813  * possibly invalid, but the generation is current, and we end up
1814  * sending a packet to a the wrong node.
1815  *
1816  * The solution is to make sure we read the generation first, so that
1817  * if a reset occurs in the process, we end up with a stale generation
1818  * and the transactions will fail instead of silently using wrong node
1819  * ID's.
1820  */
1821
1822 void hpsb_node_fill_packet(struct node_entry *ne, struct hpsb_packet *pkt)
1823 {
1824         pkt->host = ne->host;
1825         pkt->generation = ne->generation;
1826         barrier();
1827         pkt->node_id = ne->nodeid;
1828 }
1829
1830 int hpsb_node_write(struct node_entry *ne, u64 addr,
1831                     quadlet_t *buffer, size_t length)
1832 {
1833         unsigned int generation = ne->generation;
1834
1835         barrier();
1836         return hpsb_write(ne->host, ne->nodeid, generation,
1837                           addr, buffer, length);
1838 }
1839
1840 static void nodemgr_add_host(struct hpsb_host *host)
1841 {
1842         struct host_info *hi;
1843
1844         hi = hpsb_create_hostinfo(&nodemgr_highlevel, host, sizeof(*hi));
1845         if (!hi) {
1846                 HPSB_ERR("NodeMgr: out of memory in add host");
1847                 return;
1848         }
1849         hi->host = host;
1850         hi->thread = kthread_run(nodemgr_host_thread, hi, "knodemgrd_%d",
1851                                  host->id);
1852         if (IS_ERR(hi->thread)) {
1853                 HPSB_ERR("NodeMgr: cannot start thread for host %d", host->id);
1854                 hpsb_destroy_hostinfo(&nodemgr_highlevel, host);
1855         }
1856 }
1857
1858 static void nodemgr_host_reset(struct hpsb_host *host)
1859 {
1860         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1861
1862         if (hi) {
1863                 HPSB_VERBOSE("NodeMgr: Processing reset for host %d", host->id);
1864                 wake_up_process(hi->thread);
1865         }
1866 }
1867
1868 static void nodemgr_remove_host(struct hpsb_host *host)
1869 {
1870         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1871
1872         if (hi) {
1873                 kthread_stop(hi->thread);
1874                 nodemgr_remove_host_dev(&host->device);
1875         }
1876 }
1877
1878 static struct hpsb_highlevel nodemgr_highlevel = {
1879         .name =         "Node manager",
1880         .add_host =     nodemgr_add_host,
1881         .host_reset =   nodemgr_host_reset,
1882         .remove_host =  nodemgr_remove_host,
1883 };
1884
1885 int init_ieee1394_nodemgr(void)
1886 {
1887         int error;
1888
1889         error = class_register(&nodemgr_ne_class);
1890         if (error)
1891                 goto fail_ne;
1892         error = class_register(&nodemgr_ud_class);
1893         if (error)
1894                 goto fail_ud;
1895         error = driver_register(&nodemgr_mid_layer_driver);
1896         if (error)
1897                 goto fail_ml;
1898         /* This driver is not used if nodemgr is off (disable_nodemgr=1). */
1899         nodemgr_dev_template_host.driver = &nodemgr_mid_layer_driver;
1900
1901         hpsb_register_highlevel(&nodemgr_highlevel);
1902         return 0;
1903
1904 fail_ml:
1905         class_unregister(&nodemgr_ud_class);
1906 fail_ud:
1907         class_unregister(&nodemgr_ne_class);
1908 fail_ne:
1909         return error;
1910 }
1911
1912 void cleanup_ieee1394_nodemgr(void)
1913 {
1914         hpsb_unregister_highlevel(&nodemgr_highlevel);
1915         driver_unregister(&nodemgr_mid_layer_driver);
1916         class_unregister(&nodemgr_ud_class);
1917         class_unregister(&nodemgr_ne_class);
1918 }