err.no Git - linux-2.6/blob - drivers/ieee1394/nodemgr.c

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