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