drivers/ieee1394/nodemgr.c

   1 /*
   2  * Node information (ConfigROM) collection and management.
   3  *
   4  * Copyright (C) 2000           Andreas E. Bombe
   5  *               2001-2003      Ben Collins <bcollins@debian.net>
   6  *
   7  * This code is licensed under the GPL.  See the file COPYING in the root
   8  * directory of the kernel sources for details.
   9  */
  10
  11 #include <linux/bitmap.h>
  12 #include <linux/kernel.h>
  13 #include <linux/list.h>
  14 #include <linux/slab.h>
  15 #include <linux/delay.h>
  16 #include <linux/kthread.h>
  17 #include <linux/module.h>
  18 #include <linux/moduleparam.h>
  19 #include <linux/mutex.h>
  20 #include <linux/freezer.h>
  21 #include <asm/atomic.h>
  22
  23 #include "csr.h"
  24 #include "highlevel.h"
  25 #include "hosts.h"
  26 #include "ieee1394.h"
  27 #include "ieee1394_core.h"
  28 #include "ieee1394_hotplug.h"
  29 #include "ieee1394_types.h"
  30 #include "ieee1394_transactions.h"
  31 #include "nodemgr.h"
  32
  33 static int ignore_drivers;
  34 module_param(ignore_drivers, int, S_IRUGO | S_IWUSR);
  35 MODULE_PARM_DESC(ignore_drivers, "Disable automatic probing for drivers.");
  36
  37 struct nodemgr_csr_info {
  38         struct hpsb_host *host;
  39         nodeid_t nodeid;
  40         unsigned int generation;
  41         unsigned int speed_unverified:1;
  42 };
  43
  44
  45 /*
  46  * Correct the speed map entry.  This is necessary
  47  *  - for nodes with link speed < phy speed,
  48  *  - for 1394b nodes with negotiated phy port speed < IEEE1394_SPEED_MAX.
  49  * A possible speed is determined by trial and error, using quadlet reads.
  50  */
  51 static int nodemgr_check_speed(struct nodemgr_csr_info *ci, u64 addr,
  52                                quadlet_t *buffer)
  53 {
  54         quadlet_t q;
  55         u8 i, *speed, old_speed, good_speed;
  56         int error;
  57
  58         speed = &(ci->host->speed[NODEID_TO_NODE(ci->nodeid)]);
  59         old_speed = *speed;
  60         good_speed = IEEE1394_SPEED_MAX + 1;
  61
  62         /* Try every speed from S100 to old_speed.
  63          * If we did it the other way around, a too low speed could be caught
  64          * if the retry succeeded for some other reason, e.g. because the link
  65          * just finished its initialization. */
  66         for (i = IEEE1394_SPEED_100; i <= old_speed; i++) {
  67                 *speed = i;
  68                 error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
  69                                   &q, sizeof(quadlet_t));
  70                 if (error)
  71                         break;
  72                 *buffer = q;
  73                 good_speed = i;
  74         }
  75         if (good_speed <= IEEE1394_SPEED_MAX) {
  76                 HPSB_DEBUG("Speed probe of node " NODE_BUS_FMT " yields %s",
  77                            NODE_BUS_ARGS(ci->host, ci->nodeid),
  78                            hpsb_speedto_str[good_speed]);
  79                 *speed = good_speed;
  80                 ci->speed_unverified = 0;
  81                 return 0;
  82         }
  83         *speed = old_speed;
  84         return error;
  85 }
  86
  87 static int nodemgr_bus_read(struct csr1212_csr *csr, u64 addr, u16 length,
  88                             void *buffer, void *__ci)
  89 {
  90         struct nodemgr_csr_info *ci = (struct nodemgr_csr_info*)__ci;
  91         int i, error;
  92
  93         for (i = 1; ; i++) {
  94                 error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
  95                                   buffer, length);
  96                 if (!error) {
  97                         ci->speed_unverified = 0;
  98                         break;
  99                 }
 100                 /* Give up after 3rd failure. */
 101                 if (i == 3)
 102                         break;
 103
 104                 /* The ieee1394_core guessed the node's speed capability from
 105                  * the self ID.  Check whether a lower speed works. */
 106                 if (ci->speed_unverified && length == sizeof(quadlet_t)) {
 107                         error = nodemgr_check_speed(ci, addr, buffer);
 108                         if (!error)
 109                                 break;
 110                 }
 111                 if (msleep_interruptible(334))
 112                         return -EINTR;
 113         }
 114         return error;
 115 }
 116
 117 static int nodemgr_get_max_rom(quadlet_t *bus_info_data, void *__ci)
 118 {
 119         return (be32_to_cpu(bus_info_data[2]) >> 8) & 0x3;
 120 }
 121
 122 static struct csr1212_bus_ops nodemgr_csr_ops = {
 123         .bus_read =     nodemgr_bus_read,
 124         .get_max_rom =  nodemgr_get_max_rom
 125 };
 126
 127
 128 /*
 129  * Basically what we do here is start off retrieving the bus_info block.
 130  * From there will fill in some info about the node, verify it is of IEEE
 131  * 1394 type, and that the crc checks out ok. After that we start off with
 132  * the root directory, and subdirectories. To do this, we retrieve the
 133  * quadlet header for a directory, find out the length, and retrieve the
 134  * complete directory entry (be it a leaf or a directory). We then process
 135  * it and add the info to our structure for that particular node.
 136  *
 137  * We verify CRC's along the way for each directory/block/leaf. The entire
 138  * node structure is generic, and simply stores the information in a way
 139  * that's easy to parse by the protocol interface.
 140  */
 141
 142 /*
 143  * The nodemgr relies heavily on the Driver Model for device callbacks and
 144  * driver/device mappings. The old nodemgr used to handle all this itself,
 145  * but now we are much simpler because of the LDM.
 146  */
 147
 148 static DEFINE_MUTEX(nodemgr_serialize);
 149
 150 struct host_info {
 151         struct hpsb_host *host;
 152         struct list_head list;
 153         struct task_struct *thread;
 154 };
 155
 156 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv);
 157 static int nodemgr_uevent(struct device *dev, char **envp, int num_envp,
 158                           char *buffer, int buffer_size);
 159 static void nodemgr_resume_ne(struct node_entry *ne);
 160 static void nodemgr_remove_ne(struct node_entry *ne);
 161 static struct node_entry *find_entry_by_guid(u64 guid);
 162
 163 struct bus_type ieee1394_bus_type = {
 164         .name           = "ieee1394",
 165         .match          = nodemgr_bus_match,
 166 };
 167
 168 static void host_cls_release(struct device *dev)
 169 {
 170         put_device(&container_of((dev), struct hpsb_host, host_dev)->device);
 171 }
 172
 173 struct class hpsb_host_class = {
 174         .name           = "ieee1394_host",
 175         .dev_release    = host_cls_release,
 176 };
 177
 178 static void ne_cls_release(struct device *dev)
 179 {
 180         put_device(&container_of((dev), struct node_entry, node_dev)->device);
 181 }
 182
 183 static struct class nodemgr_ne_class = {
 184         .name           = "ieee1394_node",
 185         .dev_release    = ne_cls_release,
 186 };
 187
 188 static void ud_cls_release(struct device *dev)
 189 {
 190         put_device(&container_of((dev), struct unit_directory, unit_dev)->device);
 191 }
 192
 193 /* The name here is only so that unit directory hotplug works with old
 194  * style hotplug, which only ever did unit directories anyway.
 195  */
 196 static struct class nodemgr_ud_class = {
 197         .name           = "ieee1394",
 198         .dev_release    = ud_cls_release,
 199         .dev_uevent     = nodemgr_uevent,
 200 };
 201
 202 static struct hpsb_highlevel nodemgr_highlevel;
 203
 204
 205 static void nodemgr_release_ud(struct device *dev)
 206 {
 207         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 208
 209         if (ud->vendor_name_kv)
 210                 csr1212_release_keyval(ud->vendor_name_kv);
 211         if (ud->model_name_kv)
 212                 csr1212_release_keyval(ud->model_name_kv);
 213
 214         kfree(ud);
 215 }
 216
 217 static void nodemgr_release_ne(struct device *dev)
 218 {
 219         struct node_entry *ne = container_of(dev, struct node_entry, device);
 220
 221         if (ne->vendor_name_kv)
 222                 csr1212_release_keyval(ne->vendor_name_kv);
 223
 224         kfree(ne);
 225 }
 226
 227
 228 static void nodemgr_release_host(struct device *dev)
 229 {
 230         struct hpsb_host *host = container_of(dev, struct hpsb_host, device);
 231
 232         csr1212_destroy_csr(host->csr.rom);
 233
 234         kfree(host);
 235 }
 236
 237 static int nodemgr_ud_platform_data;
 238
 239 static struct device nodemgr_dev_template_ud = {
 240         .bus            = &ieee1394_bus_type,
 241         .release        = nodemgr_release_ud,
 242         .platform_data  = &nodemgr_ud_platform_data,
 243 };
 244
 245 static struct device nodemgr_dev_template_ne = {
 246         .bus            = &ieee1394_bus_type,
 247         .release        = nodemgr_release_ne,
 248 };
 249
 250 /* This dummy driver prevents the host devices from being scanned. We have no
 251  * useful drivers for them yet, and there would be a deadlock possible if the
 252  * driver core scans the host device while the host's low-level driver (i.e.
 253  * the host's parent device) is being removed. */
 254 static struct device_driver nodemgr_mid_layer_driver = {
 255         .bus            = &ieee1394_bus_type,
 256         .name           = "nodemgr",
 257         .owner          = THIS_MODULE,
 258 };
 259
 260 struct device nodemgr_dev_template_host = {
 261         .bus            = &ieee1394_bus_type,
 262         .release        = nodemgr_release_host,
 263 };
 264
 265
 266 #define fw_attr(class, class_type, field, type, format_string)          \
 267 static ssize_t fw_show_##class##_##field (struct device *dev, struct device_attribute *attr, char *buf)\
 268 {                                                                       \
 269         class_type *class;                                              \
 270         class = container_of(dev, class_type, device);                  \
 271         return sprintf(buf, format_string, (type)class->field);         \
 272 }                                                                       \
 273 static struct device_attribute dev_attr_##class##_##field = {           \
 274         .attr = {.name = __stringify(field), .mode = S_IRUGO },         \
 275         .show   = fw_show_##class##_##field,                            \
 276 };
 277
 278 #define fw_attr_td(class, class_type, td_kv)                            \
 279 static ssize_t fw_show_##class##_##td_kv (struct device *dev, struct device_attribute *attr, char *buf)\
 280 {                                                                       \
 281         int len;                                                        \
 282         class_type *class = container_of(dev, class_type, device);      \
 283         len = (class->td_kv->value.leaf.len - 2) * sizeof(quadlet_t);   \
 284         memcpy(buf,                                                     \
 285                CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(class->td_kv),      \
 286                len);                                                    \
 287         while ((buf + len - 1) == '\0')                                 \
 288                 len--;                                                  \
 289         buf[len++] = '\n';                                              \
 290         buf[len] = '\0';                                                \
 291         return len;                                                     \
 292 }                                                                       \
 293 static struct device_attribute dev_attr_##class##_##td_kv = {           \
 294         .attr = {.name = __stringify(td_kv), .mode = S_IRUGO },         \
 295         .show   = fw_show_##class##_##td_kv,                            \
 296 };
 297
 298
 299 #define fw_drv_attr(field, type, format_string)                 \
 300 static ssize_t fw_drv_show_##field (struct device_driver *drv, char *buf) \
 301 {                                                               \
 302         struct hpsb_protocol_driver *driver;                    \
 303         driver = container_of(drv, struct hpsb_protocol_driver, driver); \
 304         return sprintf(buf, format_string, (type)driver->field);\
 305 }                                                               \
 306 static struct driver_attribute driver_attr_drv_##field = {      \
 307         .attr = {.name = __stringify(field), .mode = S_IRUGO }, \
 308         .show   = fw_drv_show_##field,                          \
 309 };
 310
 311
 312 static ssize_t fw_show_ne_bus_options(struct device *dev, struct device_attribute *attr, char *buf)
 313 {
 314         struct node_entry *ne = container_of(dev, struct node_entry, device);
 315
 316         return sprintf(buf, "IRMC(%d) CMC(%d) ISC(%d) BMC(%d) PMC(%d) GEN(%d) "
 317                        "LSPD(%d) MAX_REC(%d) MAX_ROM(%d) CYC_CLK_ACC(%d)\n",
 318                        ne->busopt.irmc,
 319                        ne->busopt.cmc, ne->busopt.isc, ne->busopt.bmc,
 320                        ne->busopt.pmc, ne->busopt.generation, ne->busopt.lnkspd,
 321                        ne->busopt.max_rec,
 322                        ne->busopt.max_rom,
 323                        ne->busopt.cyc_clk_acc);
 324 }
 325 static DEVICE_ATTR(bus_options,S_IRUGO,fw_show_ne_bus_options,NULL);
 326
 327
 328 #ifdef HPSB_DEBUG_TLABELS
 329 static ssize_t fw_show_ne_tlabels_free(struct device *dev,
 330                                        struct device_attribute *attr, char *buf)
 331 {
 332         struct node_entry *ne = container_of(dev, struct node_entry, device);
 333         unsigned long flags;
 334         unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
 335         int tf;
 336
 337         spin_lock_irqsave(&hpsb_tlabel_lock, flags);
 338         tf = 64 - bitmap_weight(tp, 64);
 339         spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
 340
 341         return sprintf(buf, "%d\n", tf);
 342 }
 343 static DEVICE_ATTR(tlabels_free,S_IRUGO,fw_show_ne_tlabels_free,NULL);
 344
 345
 346 static ssize_t fw_show_ne_tlabels_mask(struct device *dev,
 347                                        struct device_attribute *attr, char *buf)
 348 {
 349         struct node_entry *ne = container_of(dev, struct node_entry, device);
 350         unsigned long flags;
 351         unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
 352         u64 tm;
 353
 354         spin_lock_irqsave(&hpsb_tlabel_lock, flags);
 355 #if (BITS_PER_LONG <= 32)
 356         tm = ((u64)tp[0] << 32) + tp[1];
 357 #else
 358         tm = tp[0];
 359 #endif
 360         spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
 361
 362         return sprintf(buf, "0x%016llx\n", (unsigned long long)tm);
 363 }
 364 static DEVICE_ATTR(tlabels_mask, S_IRUGO, fw_show_ne_tlabels_mask, NULL);
 365 #endif /* HPSB_DEBUG_TLABELS */
 366
 367
 368 static ssize_t fw_set_ignore_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 369 {
 370         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 371         int state = simple_strtoul(buf, NULL, 10);
 372
 373         if (state == 1) {
 374                 ud->ignore_driver = 1;
 375                 device_release_driver(dev);
 376         } else if (state == 0)
 377                 ud->ignore_driver = 0;
 378
 379         return count;
 380 }
 381 static ssize_t fw_get_ignore_driver(struct device *dev, struct device_attribute *attr, char *buf)
 382 {
 383         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 384
 385         return sprintf(buf, "%d\n", ud->ignore_driver);
 386 }
 387 static DEVICE_ATTR(ignore_driver, S_IWUSR | S_IRUGO, fw_get_ignore_driver, fw_set_ignore_driver);
 388
 389
 390 static ssize_t fw_set_destroy_node(struct bus_type *bus, const char *buf, size_t count)
 391 {
 392         struct node_entry *ne;
 393         u64 guid = (u64)simple_strtoull(buf, NULL, 16);
 394
 395         ne = find_entry_by_guid(guid);
 396
 397         if (ne == NULL || !ne->in_limbo)
 398                 return -EINVAL;
 399
 400         nodemgr_remove_ne(ne);
 401
 402         return count;
 403 }
 404 static ssize_t fw_get_destroy_node(struct bus_type *bus, char *buf)
 405 {
 406         return sprintf(buf, "You can destroy in_limbo nodes by writing their GUID to this file\n");
 407 }
 408 static BUS_ATTR(destroy_node, S_IWUSR | S_IRUGO, fw_get_destroy_node, fw_set_destroy_node);
 409
 410
 411 static ssize_t fw_set_rescan(struct bus_type *bus, const char *buf,
 412                              size_t count)
 413 {
 414         int error = 0;
 415
 416         if (simple_strtoul(buf, NULL, 10) == 1)
 417                 error = bus_rescan_devices(&ieee1394_bus_type);
 418         return error ? error : count;
 419 }
 420 static ssize_t fw_get_rescan(struct bus_type *bus, char *buf)
 421 {
 422         return sprintf(buf, "You can force a rescan of the bus for "
 423                         "drivers by writing a 1 to this file\n");
 424 }
 425 static BUS_ATTR(rescan, S_IWUSR | S_IRUGO, fw_get_rescan, fw_set_rescan);
 426
 427
 428 static ssize_t fw_set_ignore_drivers(struct bus_type *bus, const char *buf, size_t count)
 429 {
 430         int state = simple_strtoul(buf, NULL, 10);
 431
 432         if (state == 1)
 433                 ignore_drivers = 1;
 434         else if (state == 0)
 435                 ignore_drivers = 0;
 436
 437         return count;
 438 }
 439 static ssize_t fw_get_ignore_drivers(struct bus_type *bus, char *buf)
 440 {
 441         return sprintf(buf, "%d\n", ignore_drivers);
 442 }
 443 static BUS_ATTR(ignore_drivers, S_IWUSR | S_IRUGO, fw_get_ignore_drivers, fw_set_ignore_drivers);
 444
 445
 446 struct bus_attribute *const fw_bus_attrs[] = {
 447         &bus_attr_destroy_node,
 448         &bus_attr_rescan,
 449         &bus_attr_ignore_drivers,
 450         NULL
 451 };
 452
 453
 454 fw_attr(ne, struct node_entry, capabilities, unsigned int, "0x%06x\n")
 455 fw_attr(ne, struct node_entry, nodeid, unsigned int, "0x%04x\n")
 456
 457 fw_attr(ne, struct node_entry, vendor_id, unsigned int, "0x%06x\n")
 458 fw_attr_td(ne, struct node_entry, vendor_name_kv)
 459
 460 fw_attr(ne, struct node_entry, guid, unsigned long long, "0x%016Lx\n")
 461 fw_attr(ne, struct node_entry, guid_vendor_id, unsigned int, "0x%06x\n")
 462 fw_attr(ne, struct node_entry, in_limbo, int, "%d\n");
 463
 464 static struct device_attribute *const fw_ne_attrs[] = {
 465         &dev_attr_ne_guid,
 466         &dev_attr_ne_guid_vendor_id,
 467         &dev_attr_ne_capabilities,
 468         &dev_attr_ne_vendor_id,
 469         &dev_attr_ne_nodeid,
 470         &dev_attr_bus_options,
 471 #ifdef HPSB_DEBUG_TLABELS
 472         &dev_attr_tlabels_free,
 473         &dev_attr_tlabels_mask,
 474 #endif
 475 };
 476
 477
 478
 479 fw_attr(ud, struct unit_directory, address, unsigned long long, "0x%016Lx\n")
 480 fw_attr(ud, struct unit_directory, length, int, "%d\n")
 481 /* These are all dependent on the value being provided */
 482 fw_attr(ud, struct unit_directory, vendor_id, unsigned int, "0x%06x\n")
 483 fw_attr(ud, struct unit_directory, model_id, unsigned int, "0x%06x\n")
 484 fw_attr(ud, struct unit_directory, specifier_id, unsigned int, "0x%06x\n")
 485 fw_attr(ud, struct unit_directory, version, unsigned int, "0x%06x\n")
 486 fw_attr_td(ud, struct unit_directory, vendor_name_kv)
 487 fw_attr_td(ud, struct unit_directory, model_name_kv)
 488
 489 static struct device_attribute *const fw_ud_attrs[] = {
 490         &dev_attr_ud_address,
 491         &dev_attr_ud_length,
 492         &dev_attr_ignore_driver,
 493 };
 494
 495
 496 fw_attr(host, struct hpsb_host, node_count, int, "%d\n")
 497 fw_attr(host, struct hpsb_host, selfid_count, int, "%d\n")
 498 fw_attr(host, struct hpsb_host, nodes_active, int, "%d\n")
 499 fw_attr(host, struct hpsb_host, in_bus_reset, int, "%d\n")
 500 fw_attr(host, struct hpsb_host, is_root, int, "%d\n")
 501 fw_attr(host, struct hpsb_host, is_cycmst, int, "%d\n")
 502 fw_attr(host, struct hpsb_host, is_irm, int, "%d\n")
 503 fw_attr(host, struct hpsb_host, is_busmgr, int, "%d\n")
 504
 505 static struct device_attribute *const fw_host_attrs[] = {
 506         &dev_attr_host_node_count,
 507         &dev_attr_host_selfid_count,
 508         &dev_attr_host_nodes_active,
 509         &dev_attr_host_in_bus_reset,
 510         &dev_attr_host_is_root,
 511         &dev_attr_host_is_cycmst,
 512         &dev_attr_host_is_irm,
 513         &dev_attr_host_is_busmgr,
 514 };
 515
 516
 517 static ssize_t fw_show_drv_device_ids(struct device_driver *drv, char *buf)
 518 {
 519         struct hpsb_protocol_driver *driver;
 520         struct ieee1394_device_id *id;
 521         int length = 0;
 522         char *scratch = buf;
 523
 524         driver = container_of(drv, struct hpsb_protocol_driver, driver);
 525
 526         for (id = driver->id_table; id->match_flags != 0; id++) {
 527                 int need_coma = 0;
 528
 529                 if (id->match_flags & IEEE1394_MATCH_VENDOR_ID) {
 530                         length += sprintf(scratch, "vendor_id=0x%06x", id->vendor_id);
 531                         scratch = buf + length;
 532                         need_coma++;
 533                 }
 534
 535                 if (id->match_flags & IEEE1394_MATCH_MODEL_ID) {
 536                         length += sprintf(scratch, "%smodel_id=0x%06x",
 537                                           need_coma++ ? "," : "",
 538                                           id->model_id);
 539                         scratch = buf + length;
 540                 }
 541
 542                 if (id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) {
 543                         length += sprintf(scratch, "%sspecifier_id=0x%06x",
 544                                           need_coma++ ? "," : "",
 545                                           id->specifier_id);
 546                         scratch = buf + length;
 547                 }
 548
 549                 if (id->match_flags & IEEE1394_MATCH_VERSION) {
 550                         length += sprintf(scratch, "%sversion=0x%06x",
 551                                           need_coma++ ? "," : "",
 552                                           id->version);
 553                         scratch = buf + length;
 554                 }
 555
 556                 if (need_coma) {
 557                         *scratch++ = '\n';
 558                         length++;
 559                 }
 560         }
 561
 562         return length;
 563 }
 564 static DRIVER_ATTR(device_ids,S_IRUGO,fw_show_drv_device_ids,NULL);
 565
 566
 567 fw_drv_attr(name, const char *, "%s\n")
 568
 569 static struct driver_attribute *const fw_drv_attrs[] = {
 570         &driver_attr_drv_name,
 571         &driver_attr_device_ids,
 572 };
 573
 574
 575 static void nodemgr_create_drv_files(struct hpsb_protocol_driver *driver)
 576 {
 577         struct device_driver *drv = &driver->driver;
 578         int i;
 579
 580         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
 581                 if (driver_create_file(drv, fw_drv_attrs[i]))
 582                         goto fail;
 583         return;
 584 fail:
 585         HPSB_ERR("Failed to add sysfs attribute");
 586 }
 587
 588
 589 static void nodemgr_remove_drv_files(struct hpsb_protocol_driver *driver)
 590 {
 591         struct device_driver *drv = &driver->driver;
 592         int i;
 593
 594         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
 595                 driver_remove_file(drv, fw_drv_attrs[i]);
 596 }
 597
 598
 599 static void nodemgr_create_ne_dev_files(struct node_entry *ne)
 600 {
 601         struct device *dev = &ne->device;
 602         int i;
 603
 604         for (i = 0; i < ARRAY_SIZE(fw_ne_attrs); i++)
 605                 if (device_create_file(dev, fw_ne_attrs[i]))
 606                         goto fail;
 607         return;
 608 fail:
 609         HPSB_ERR("Failed to add sysfs attribute");
 610 }
 611
 612
 613 static void nodemgr_create_host_dev_files(struct hpsb_host *host)
 614 {
 615         struct device *dev = &host->device;
 616         int i;
 617
 618         for (i = 0; i < ARRAY_SIZE(fw_host_attrs); i++)
 619                 if (device_create_file(dev, fw_host_attrs[i]))
 620                         goto fail;
 621         return;
 622 fail:
 623         HPSB_ERR("Failed to add sysfs attribute");
 624 }
 625
 626
 627 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
 628                                                nodeid_t nodeid);
 629
 630 static void nodemgr_update_host_dev_links(struct hpsb_host *host)
 631 {
 632         struct device *dev = &host->device;
 633         struct node_entry *ne;
 634
 635         sysfs_remove_link(&dev->kobj, "irm_id");
 636         sysfs_remove_link(&dev->kobj, "busmgr_id");
 637         sysfs_remove_link(&dev->kobj, "host_id");
 638
 639         if ((ne = find_entry_by_nodeid(host, host->irm_id)) &&
 640             sysfs_create_link(&dev->kobj, &ne->device.kobj, "irm_id"))
 641                 goto fail;
 642         if ((ne = find_entry_by_nodeid(host, host->busmgr_id)) &&
 643             sysfs_create_link(&dev->kobj, &ne->device.kobj, "busmgr_id"))
 644                 goto fail;
 645         if ((ne = find_entry_by_nodeid(host, host->node_id)) &&
 646             sysfs_create_link(&dev->kobj, &ne->device.kobj, "host_id"))
 647                 goto fail;
 648         return;
 649 fail:
 650         HPSB_ERR("Failed to update sysfs attributes for host %d", host->id);
 651 }
 652
 653 static void nodemgr_create_ud_dev_files(struct unit_directory *ud)
 654 {
 655         struct device *dev = &ud->device;
 656         int i;
 657
 658         for (i = 0; i < ARRAY_SIZE(fw_ud_attrs); i++)
 659                 if (device_create_file(dev, fw_ud_attrs[i]))
 660                         goto fail;
 661         if (ud->flags & UNIT_DIRECTORY_SPECIFIER_ID)
 662                 if (device_create_file(dev, &dev_attr_ud_specifier_id))
 663                         goto fail;
 664         if (ud->flags & UNIT_DIRECTORY_VERSION)
 665                 if (device_create_file(dev, &dev_attr_ud_version))
 666                         goto fail;
 667         if (ud->flags & UNIT_DIRECTORY_VENDOR_ID) {
 668                 if (device_create_file(dev, &dev_attr_ud_vendor_id))
 669                         goto fail;
 670                 if (ud->vendor_name_kv &&
 671                     device_create_file(dev, &dev_attr_ud_vendor_name_kv))
 672                         goto fail;
 673         }
 674         if (ud->flags & UNIT_DIRECTORY_MODEL_ID) {
 675                 if (device_create_file(dev, &dev_attr_ud_model_id))
 676                         goto fail;
 677                 if (ud->model_name_kv &&
 678                     device_create_file(dev, &dev_attr_ud_model_name_kv))
 679                         goto fail;
 680         }
 681         return;
 682 fail:
 683         HPSB_ERR("Failed to add sysfs attribute");
 684 }
 685
 686
 687 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv)
 688 {
 689         struct hpsb_protocol_driver *driver;
 690         struct unit_directory *ud;
 691         struct ieee1394_device_id *id;
 692
 693         /* We only match unit directories */
 694         if (dev->platform_data != &nodemgr_ud_platform_data)
 695                 return 0;
 696
 697         ud = container_of(dev, struct unit_directory, device);
 698         if (ud->ne->in_limbo || ud->ignore_driver)
 699                 return 0;
 700
 701         /* We only match drivers of type hpsb_protocol_driver */
 702         if (drv == &nodemgr_mid_layer_driver)
 703                 return 0;
 704
 705         driver = container_of(drv, struct hpsb_protocol_driver, driver);
 706         for (id = driver->id_table; id->match_flags != 0; id++) {
 707                 if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) &&
 708                     id->vendor_id != ud->vendor_id)
 709                         continue;
 710
 711                 if ((id->match_flags & IEEE1394_MATCH_MODEL_ID) &&
 712                     id->model_id != ud->model_id)
 713                         continue;
 714
 715                 if ((id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) &&
 716                     id->specifier_id != ud->specifier_id)
 717                         continue;
 718
 719                 if ((id->match_flags & IEEE1394_MATCH_VERSION) &&
 720                     id->version != ud->version)
 721                         continue;
 722
 723                 return 1;
 724         }
 725
 726         return 0;
 727 }
 728
 729
 730 static DEFINE_MUTEX(nodemgr_serialize_remove_uds);
 731
 732 static void nodemgr_remove_uds(struct node_entry *ne)
 733 {
 734         struct device *dev;
 735         struct unit_directory *tmp, *ud;
 736
 737         /* Iteration over nodemgr_ud_class.devices has to be protected by
 738          * nodemgr_ud_class.sem, but device_unregister() will eventually
 739          * take nodemgr_ud_class.sem too. Therefore pick out one ud at a time,
 740          * release the semaphore, and then unregister the ud. Since this code
 741          * may be called from other contexts besides the knodemgrds, protect the
 742          * gap after release of the semaphore by nodemgr_serialize_remove_uds.
 743          */
 744         mutex_lock(&nodemgr_serialize_remove_uds);
 745         for (;;) {
 746                 ud = NULL;
 747                 down(&nodemgr_ud_class.sem);
 748                 list_for_each_entry(dev, &nodemgr_ud_class.devices, node) {
 749                         tmp = container_of(dev, struct unit_directory,
 750                                            unit_dev);
 751                         if (tmp->ne == ne) {
 752                                 ud = tmp;
 753                                 break;
 754                         }
 755                 }
 756                 up(&nodemgr_ud_class.sem);
 757                 if (ud == NULL)
 758                         break;
 759                 device_unregister(&ud->unit_dev);
 760                 device_unregister(&ud->device);
 761         }
 762         mutex_unlock(&nodemgr_serialize_remove_uds);
 763 }
 764
 765
 766 static void nodemgr_remove_ne(struct node_entry *ne)
 767 {
 768         struct device *dev;
 769
 770         dev = get_device(&ne->device);
 771         if (!dev)
 772                 return;
 773
 774         HPSB_DEBUG("Node removed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 775                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
 776         nodemgr_remove_uds(ne);
 777
 778         device_unregister(&ne->node_dev);
 779         device_unregister(dev);
 780
 781         put_device(dev);
 782 }
 783
 784 static int __nodemgr_remove_host_dev(struct device *dev, void *data)
 785 {
 786         if (dev->bus == &ieee1394_bus_type)
 787                 nodemgr_remove_ne(container_of(dev, struct node_entry,
 788                                   device));
 789         return 0;
 790 }
 791
 792 static void nodemgr_remove_host_dev(struct device *dev)
 793 {
 794         WARN_ON(device_for_each_child(dev, NULL, __nodemgr_remove_host_dev));
 795         sysfs_remove_link(&dev->kobj, "irm_id");
 796         sysfs_remove_link(&dev->kobj, "busmgr_id");
 797         sysfs_remove_link(&dev->kobj, "host_id");
 798 }
 799
 800
 801 static void nodemgr_update_bus_options(struct node_entry *ne)
 802 {
 803 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
 804         static const u16 mr[] = { 4, 64, 1024, 0};
 805 #endif
 806         quadlet_t busoptions = be32_to_cpu(ne->csr->bus_info_data[2]);
 807
 808         ne->busopt.irmc         = (busoptions >> 31) & 1;
 809         ne->busopt.cmc          = (busoptions >> 30) & 1;
 810         ne->busopt.isc          = (busoptions >> 29) & 1;
 811         ne->busopt.bmc          = (busoptions >> 28) & 1;
 812         ne->busopt.pmc          = (busoptions >> 27) & 1;
 813         ne->busopt.cyc_clk_acc  = (busoptions >> 16) & 0xff;
 814         ne->busopt.max_rec      = 1 << (((busoptions >> 12) & 0xf) + 1);
 815         ne->busopt.max_rom      = (busoptions >> 8) & 0x3;
 816         ne->busopt.generation   = (busoptions >> 4) & 0xf;
 817         ne->busopt.lnkspd       = busoptions & 0x7;
 818
 819         HPSB_VERBOSE("NodeMgr: raw=0x%08x irmc=%d cmc=%d isc=%d bmc=%d pmc=%d "
 820                      "cyc_clk_acc=%d max_rec=%d max_rom=%d gen=%d lspd=%d",
 821                      busoptions, ne->busopt.irmc, ne->busopt.cmc,
 822                      ne->busopt.isc, ne->busopt.bmc, ne->busopt.pmc,
 823                      ne->busopt.cyc_clk_acc, ne->busopt.max_rec,
 824                      mr[ne->busopt.max_rom],
 825                      ne->busopt.generation, ne->busopt.lnkspd);
 826 }
 827
 828
 829 static struct node_entry *nodemgr_create_node(octlet_t guid, struct csr1212_csr *csr,
 830                                               struct host_info *hi, nodeid_t nodeid,
 831                                               unsigned int generation)
 832 {
 833         struct hpsb_host *host = hi->host;
 834         struct node_entry *ne;
 835
 836         ne = kzalloc(sizeof(*ne), GFP_KERNEL);
 837         if (!ne)
 838                 goto fail_alloc;
 839
 840         ne->host = host;
 841         ne->nodeid = nodeid;
 842         ne->generation = generation;
 843         ne->needs_probe = 1;
 844
 845         ne->guid = guid;
 846         ne->guid_vendor_id = (guid >> 40) & 0xffffff;
 847         ne->csr = csr;
 848
 849         memcpy(&ne->device, &nodemgr_dev_template_ne,
 850                sizeof(ne->device));
 851         ne->device.parent = &host->device;
 852         snprintf(ne->device.bus_id, BUS_ID_SIZE, "%016Lx",
 853                  (unsigned long long)(ne->guid));
 854
 855         ne->node_dev.parent = &ne->device;
 856         ne->node_dev.class = &nodemgr_ne_class;
 857         snprintf(ne->node_dev.bus_id, BUS_ID_SIZE, "%016Lx",
 858                 (unsigned long long)(ne->guid));
 859
 860         if (device_register(&ne->device))
 861                 goto fail_devreg;
 862         if (device_register(&ne->node_dev))
 863                 goto fail_classdevreg;
 864         get_device(&ne->device);
 865
 866         nodemgr_create_ne_dev_files(ne);
 867
 868         nodemgr_update_bus_options(ne);
 869
 870         HPSB_DEBUG("%s added: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 871                    (host->node_id == nodeid) ? "Host" : "Node",
 872                    NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
 873
 874         return ne;
 875
 876 fail_classdevreg:
 877         device_unregister(&ne->device);
 878 fail_devreg:
 879         kfree(ne);
 880 fail_alloc:
 881         HPSB_ERR("Failed to create node ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 882                  NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
 883
 884         return NULL;
 885 }
 886
 887
 888 static struct node_entry *find_entry_by_guid(u64 guid)
 889 {
 890         struct device *dev;
 891         struct node_entry *ne, *ret_ne = NULL;
 892
 893         down(&nodemgr_ne_class.sem);
 894         list_for_each_entry(dev, &nodemgr_ne_class.devices, node) {
 895                 ne = container_of(dev, struct node_entry, node_dev);
 896
 897                 if (ne->guid == guid) {
 898                         ret_ne = ne;
 899                         break;
 900                 }
 901         }
 902         up(&nodemgr_ne_class.sem);
 903
 904         return ret_ne;
 905 }
 906
 907
 908 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
 909                                                nodeid_t nodeid)
 910 {
 911         struct device *dev;
 912         struct node_entry *ne, *ret_ne = NULL;
 913
 914         down(&nodemgr_ne_class.sem);
 915         list_for_each_entry(dev, &nodemgr_ne_class.devices, node) {
 916                 ne = container_of(dev, struct node_entry, node_dev);
 917
 918                 if (ne->host == host && ne->nodeid == nodeid) {
 919                         ret_ne = ne;
 920                         break;
 921                 }
 922         }
 923         up(&nodemgr_ne_class.sem);
 924
 925         return ret_ne;
 926 }
 927
 928
 929 static void nodemgr_register_device(struct node_entry *ne,
 930         struct unit_directory *ud, struct device *parent)
 931 {
 932         memcpy(&ud->device, &nodemgr_dev_template_ud,
 933                sizeof(ud->device));
 934
 935         ud->device.parent = parent;
 936
 937         snprintf(ud->device.bus_id, BUS_ID_SIZE, "%s-%u",
 938                  ne->device.bus_id, ud->id);
 939
 940         ud->unit_dev.parent = &ud->device;
 941         ud->unit_dev.class = &nodemgr_ud_class;
 942         snprintf(ud->unit_dev.bus_id, BUS_ID_SIZE, "%s-%u",
 943                  ne->device.bus_id, ud->id);
 944
 945         if (device_register(&ud->device))
 946                 goto fail_devreg;
 947         if (device_register(&ud->unit_dev))
 948                 goto fail_classdevreg;
 949         get_device(&ud->device);
 950
 951         nodemgr_create_ud_dev_files(ud);
 952
 953         return;
 954
 955 fail_classdevreg:
 956         device_unregister(&ud->device);
 957 fail_devreg:
 958         HPSB_ERR("Failed to create unit %s", ud->device.bus_id);
 959 }
 960
 961
 962 /* This implementation currently only scans the config rom and its
 963  * immediate unit directories looking for software_id and
 964  * software_version entries, in order to get driver autoloading working. */
 965 static struct unit_directory *nodemgr_process_unit_directory
 966         (struct host_info *hi, struct node_entry *ne, struct csr1212_keyval *ud_kv,
 967          unsigned int *id, struct unit_directory *parent)
 968 {
 969         struct unit_directory *ud;
 970         struct unit_directory *ud_child = NULL;
 971         struct csr1212_dentry *dentry;
 972         struct csr1212_keyval *kv;
 973         u8 last_key_id = 0;
 974
 975         ud = kzalloc(sizeof(*ud), GFP_KERNEL);
 976         if (!ud)
 977                 goto unit_directory_error;
 978
 979         ud->ne = ne;
 980         ud->ignore_driver = ignore_drivers;
 981         ud->address = ud_kv->offset + CSR1212_REGISTER_SPACE_BASE;
 982         ud->directory_id = ud->address & 0xffffff;
 983         ud->ud_kv = ud_kv;
 984         ud->id = (*id)++;
 985
 986         csr1212_for_each_dir_entry(ne->csr, kv, ud_kv, dentry) {
 987                 switch (kv->key.id) {
 988                 case CSR1212_KV_ID_VENDOR:
 989                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
 990                                 ud->vendor_id = kv->value.immediate;
 991                                 ud->flags |= UNIT_DIRECTORY_VENDOR_ID;
 992                         }
 993                         break;
 994
 995                 case CSR1212_KV_ID_MODEL:
 996                         ud->model_id = kv->value.immediate;
 997                         ud->flags |= UNIT_DIRECTORY_MODEL_ID;
 998                         break;
 999
1000                 case CSR1212_KV_ID_SPECIFIER_ID:
1001                         ud->specifier_id = kv->value.immediate;
1002                         ud->flags |= UNIT_DIRECTORY_SPECIFIER_ID;
1003                         break;
1004
1005                 case CSR1212_KV_ID_VERSION:
1006                         ud->version = kv->value.immediate;
1007                         ud->flags |= UNIT_DIRECTORY_VERSION;
1008                         break;
1009
1010                 case CSR1212_KV_ID_DESCRIPTOR:
1011                         if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1012                             CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1013                             CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1014                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1015                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1016                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1017                                 switch (last_key_id) {
1018                                 case CSR1212_KV_ID_VENDOR:
1019                                         ud->vendor_name_kv = kv;
1020                                         csr1212_keep_keyval(kv);
1021                                         break;
1022
1023                                 case CSR1212_KV_ID_MODEL:
1024                                         ud->model_name_kv = kv;
1025                                         csr1212_keep_keyval(kv);
1026                                         break;
1027
1028                                 }
1029                         } /* else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) ... */
1030                         break;
1031
1032                 case CSR1212_KV_ID_DEPENDENT_INFO:
1033                         /* Logical Unit Number */
1034                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
1035                                 if (ud->flags & UNIT_DIRECTORY_HAS_LUN) {
1036                                         ud_child = kmemdup(ud, sizeof(*ud_child), GFP_KERNEL);
1037                                         if (!ud_child)
1038                                                 goto unit_directory_error;
1039                                         nodemgr_register_device(ne, ud_child, &ne->device);
1040                                         ud_child = NULL;
1041
1042                                         ud->id = (*id)++;
1043                                 }
1044                                 ud->lun = kv->value.immediate;
1045                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN;
1046
1047                         /* Logical Unit Directory */
1048                         } else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) {
1049                                 /* This should really be done in SBP2 as this is
1050                                  * doing SBP2 specific parsing.
1051                                  */
1052
1053                                 /* first register the parent unit */
1054                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN_DIRECTORY;
1055                                 if (ud->device.bus != &ieee1394_bus_type)
1056                                         nodemgr_register_device(ne, ud, &ne->device);
1057
1058                                 /* process the child unit */
1059                                 ud_child = nodemgr_process_unit_directory(hi, ne, kv, id, ud);
1060
1061                                 if (ud_child == NULL)
1062                                         break;
1063
1064                                 /* inherit unspecified values, the driver core picks it up */
1065                                 if ((ud->flags & UNIT_DIRECTORY_MODEL_ID) &&
1066                                     !(ud_child->flags & UNIT_DIRECTORY_MODEL_ID))
1067                                 {
1068                                         ud_child->flags |=  UNIT_DIRECTORY_MODEL_ID;
1069                                         ud_child->model_id = ud->model_id;
1070                                 }
1071                                 if ((ud->flags & UNIT_DIRECTORY_SPECIFIER_ID) &&
1072                                     !(ud_child->flags & UNIT_DIRECTORY_SPECIFIER_ID))
1073                                 {
1074                                         ud_child->flags |=  UNIT_DIRECTORY_SPECIFIER_ID;
1075                                         ud_child->specifier_id = ud->specifier_id;
1076                                 }
1077                                 if ((ud->flags & UNIT_DIRECTORY_VERSION) &&
1078                                     !(ud_child->flags & UNIT_DIRECTORY_VERSION))
1079                                 {
1080                                         ud_child->flags |=  UNIT_DIRECTORY_VERSION;
1081                                         ud_child->version = ud->version;
1082                                 }
1083
1084                                 /* register the child unit */
1085                                 ud_child->flags |= UNIT_DIRECTORY_LUN_DIRECTORY;
1086                                 nodemgr_register_device(ne, ud_child, &ud->device);
1087                         }
1088
1089                         break;
1090
1091                 case CSR1212_KV_ID_DIRECTORY_ID:
1092                         ud->directory_id = kv->value.immediate;
1093                         break;
1094
1095                 default:
1096                         break;
1097                 }
1098                 last_key_id = kv->key.id;
1099         }
1100
1101         /* do not process child units here and only if not already registered */
1102         if (!parent && ud->device.bus != &ieee1394_bus_type)
1103                 nodemgr_register_device(ne, ud, &ne->device);
1104
1105         return ud;
1106
1107 unit_directory_error:
1108         kfree(ud);
1109         return NULL;
1110 }
1111
1112
1113 static void nodemgr_process_root_directory(struct host_info *hi, struct node_entry *ne)
1114 {
1115         unsigned int ud_id = 0;
1116         struct csr1212_dentry *dentry;
1117         struct csr1212_keyval *kv;
1118         u8 last_key_id = 0;
1119
1120         ne->needs_probe = 0;
1121
1122         csr1212_for_each_dir_entry(ne->csr, kv, ne->csr->root_kv, dentry) {
1123                 switch (kv->key.id) {
1124                 case CSR1212_KV_ID_VENDOR:
1125                         ne->vendor_id = kv->value.immediate;
1126                         break;
1127
1128                 case CSR1212_KV_ID_NODE_CAPABILITIES:
1129                         ne->capabilities = kv->value.immediate;
1130                         break;
1131
1132                 case CSR1212_KV_ID_UNIT:
1133                         nodemgr_process_unit_directory(hi, ne, kv, &ud_id, NULL);
1134                         break;
1135
1136                 case CSR1212_KV_ID_DESCRIPTOR:
1137                         if (last_key_id == CSR1212_KV_ID_VENDOR) {
1138                                 if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1139                                     CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1140                                     CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1141                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1142                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1143                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1144                                         ne->vendor_name_kv = kv;
1145                                         csr1212_keep_keyval(kv);
1146                                 }
1147                         }
1148                         break;
1149                 }
1150                 last_key_id = kv->key.id;
1151         }
1152
1153         if (ne->vendor_name_kv) {
1154                 int error = device_create_file(&ne->device,
1155                                                &dev_attr_ne_vendor_name_kv);
1156
1157                 if (error && error != -EEXIST)
1158                         HPSB_ERR("Failed to add sysfs attribute");
1159         }
1160 }
1161
1162 #ifdef CONFIG_HOTPLUG
1163
1164 static int nodemgr_uevent(struct device *dev, char **envp, int num_envp,
1165                           char *buffer, int buffer_size)
1166 {
1167         struct unit_directory *ud;
1168         int i = 0;
1169         int length = 0;
1170         int retval = 0;
1171         /* ieee1394:venNmoNspNverN */
1172         char buf[8 + 1 + 3 + 8 + 2 + 8 + 2 + 8 + 3 + 8 + 1];
1173
1174         if (!dev)
1175                 return -ENODEV;
1176
1177         ud = container_of(dev, struct unit_directory, unit_dev);
1178
1179         if (ud->ne->in_limbo || ud->ignore_driver)
1180                 return -ENODEV;
1181
1182 #define PUT_ENVP(fmt,val)                                       \
1183 do {                                                            \
1184         retval = add_uevent_var(envp, num_envp, &i,             \
1185                                 buffer, buffer_size, &length,   \
1186                                 fmt, val);                      \
1187         if (retval)                                             \
1188                 return retval;                                  \
1189 } while (0)
1190
1191         PUT_ENVP("VENDOR_ID=%06x", ud->vendor_id);
1192         PUT_ENVP("MODEL_ID=%06x", ud->model_id);
1193         PUT_ENVP("GUID=%016Lx", (unsigned long long)ud->ne->guid);
1194         PUT_ENVP("SPECIFIER_ID=%06x", ud->specifier_id);
1195         PUT_ENVP("VERSION=%06x", ud->version);
1196         snprintf(buf, sizeof(buf), "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
1197                         ud->vendor_id,
1198                         ud->model_id,
1199                         ud->specifier_id,
1200                         ud->version);
1201         PUT_ENVP("MODALIAS=%s", buf);
1202
1203 #undef PUT_ENVP
1204
1205         envp[i] = NULL;
1206
1207         return 0;
1208 }
1209
1210 #else
1211
1212 static int nodemgr_uevent(struct device *dev, char **envp, int num_envp,
1213                           char *buffer, int buffer_size)
1214 {
1215         return -ENODEV;
1216 }
1217
1218 #endif /* CONFIG_HOTPLUG */
1219
1220
1221 int __hpsb_register_protocol(struct hpsb_protocol_driver *drv,
1222                              struct module *owner)
1223 {
1224         int error;
1225
1226         drv->driver.bus = &ieee1394_bus_type;
1227         drv->driver.owner = owner;
1228         drv->driver.name = drv->name;
1229
1230         /* This will cause a probe for devices */
1231         error = driver_register(&drv->driver);
1232         if (!error)
1233                 nodemgr_create_drv_files(drv);
1234         return error;
1235 }
1236
1237 void hpsb_unregister_protocol(struct hpsb_protocol_driver *driver)
1238 {
1239         nodemgr_remove_drv_files(driver);
1240         /* This will subsequently disconnect all devices that our driver
1241          * is attached to. */
1242         driver_unregister(&driver->driver);
1243 }
1244
1245
1246 /*
1247  * This function updates nodes that were present on the bus before the
1248  * reset and still are after the reset.  The nodeid and the config rom
1249  * may have changed, and the drivers managing this device must be
1250  * informed that this device just went through a bus reset, to allow
1251  * the to take whatever actions required.
1252  */
1253 static void nodemgr_update_node(struct node_entry *ne, struct csr1212_csr *csr,
1254                                 struct host_info *hi, nodeid_t nodeid,
1255                                 unsigned int generation)
1256 {
1257         if (ne->nodeid != nodeid) {
1258                 HPSB_DEBUG("Node changed: " NODE_BUS_FMT " -> " NODE_BUS_FMT,
1259                            NODE_BUS_ARGS(ne->host, ne->nodeid),
1260                            NODE_BUS_ARGS(ne->host, nodeid));
1261                 ne->nodeid = nodeid;
1262         }
1263
1264         if (ne->busopt.generation != ((be32_to_cpu(csr->bus_info_data[2]) >> 4) & 0xf)) {
1265                 kfree(ne->csr->private);
1266                 csr1212_destroy_csr(ne->csr);
1267                 ne->csr = csr;
1268
1269                 /* If the node's configrom generation has changed, we
1270                  * unregister all the unit directories. */
1271                 nodemgr_remove_uds(ne);
1272
1273                 nodemgr_update_bus_options(ne);
1274
1275                 /* Mark the node as new, so it gets re-probed */
1276                 ne->needs_probe = 1;
1277         } else {
1278                 /* old cache is valid, so update its generation */
1279                 struct nodemgr_csr_info *ci = ne->csr->private;
1280                 ci->generation = generation;
1281                 /* free the partially filled now unneeded new cache */
1282                 kfree(csr->private);
1283                 csr1212_destroy_csr(csr);
1284         }
1285
1286         if (ne->in_limbo)
1287                 nodemgr_resume_ne(ne);
1288
1289         /* Mark the node current */
1290         ne->generation = generation;
1291 }
1292
1293
1294
1295 static void nodemgr_node_scan_one(struct host_info *hi,
1296                                   nodeid_t nodeid, int generation)
1297 {
1298         struct hpsb_host *host = hi->host;
1299         struct node_entry *ne;
1300         octlet_t guid;
1301         struct csr1212_csr *csr;
1302         struct nodemgr_csr_info *ci;
1303         u8 *speed;
1304
1305         ci = kmalloc(sizeof(*ci), GFP_KERNEL);
1306         if (!ci)
1307                 return;
1308
1309         ci->host = host;
1310         ci->nodeid = nodeid;
1311         ci->generation = generation;
1312
1313         /* Prepare for speed probe which occurs when reading the ROM */
1314         speed = &(host->speed[NODEID_TO_NODE(nodeid)]);
1315         if (*speed > host->csr.lnk_spd)
1316                 *speed = host->csr.lnk_spd;
1317         ci->speed_unverified = *speed > IEEE1394_SPEED_100;
1318
1319         /* We need to detect when the ConfigROM's generation has changed,
1320          * so we only update the node's info when it needs to be.  */
1321
1322         csr = csr1212_create_csr(&nodemgr_csr_ops, 5 * sizeof(quadlet_t), ci);
1323         if (!csr || csr1212_parse_csr(csr) != CSR1212_SUCCESS) {
1324                 HPSB_ERR("Error parsing configrom for node " NODE_BUS_FMT,
1325                          NODE_BUS_ARGS(host, nodeid));
1326                 if (csr)
1327                         csr1212_destroy_csr(csr);
1328                 kfree(ci);
1329                 return;
1330         }
1331
1332         if (csr->bus_info_data[1] != IEEE1394_BUSID_MAGIC) {
1333                 /* This isn't a 1394 device, but we let it slide. There
1334                  * was a report of a device with broken firmware which
1335                  * reported '2394' instead of '1394', which is obviously a
1336                  * mistake. One would hope that a non-1394 device never
1337                  * gets connected to Firewire bus. If someone does, we
1338                  * shouldn't be held responsible, so we'll allow it with a
1339                  * warning.  */
1340                 HPSB_WARN("Node " NODE_BUS_FMT " has invalid busID magic [0x%08x]",
1341                           NODE_BUS_ARGS(host, nodeid), csr->bus_info_data[1]);
1342         }
1343
1344         guid = ((u64)be32_to_cpu(csr->bus_info_data[3]) << 32) | be32_to_cpu(csr->bus_info_data[4]);
1345         ne = find_entry_by_guid(guid);
1346
1347         if (ne && ne->host != host && ne->in_limbo) {
1348                 /* Must have moved this device from one host to another */
1349                 nodemgr_remove_ne(ne);
1350                 ne = NULL;
1351         }
1352
1353         if (!ne)
1354                 nodemgr_create_node(guid, csr, hi, nodeid, generation);
1355         else
1356                 nodemgr_update_node(ne, csr, hi, nodeid, generation);
1357 }
1358
1359
1360 static void nodemgr_node_scan(struct host_info *hi, int generation)
1361 {
1362         int count;
1363         struct hpsb_host *host = hi->host;
1364         struct selfid *sid = (struct selfid *)host->topology_map;
1365         nodeid_t nodeid = LOCAL_BUS;
1366
1367         /* Scan each node on the bus */
1368         for (count = host->selfid_count; count; count--, sid++) {
1369                 if (sid->extended)
1370                         continue;
1371
1372                 if (!sid->link_active) {
1373                         nodeid++;
1374                         continue;
1375                 }
1376                 nodemgr_node_scan_one(hi, nodeid++, generation);
1377         }
1378 }
1379
1380
1381 static void nodemgr_suspend_ne(struct node_entry *ne)
1382 {
1383         struct device *dev;
1384         struct unit_directory *ud;
1385
1386         HPSB_DEBUG("Node suspended: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1387                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1388
1389         ne->in_limbo = 1;
1390         WARN_ON(device_create_file(&ne->device, &dev_attr_ne_in_limbo));
1391
1392         down(&nodemgr_ud_class.sem);
1393         list_for_each_entry(dev, &nodemgr_ud_class.devices, node) {
1394                 ud = container_of(dev, struct unit_directory, unit_dev);
1395                 if (ud->ne != ne)
1396                         continue;
1397
1398                 if (ud->device.driver &&
1399                     (!ud->device.driver->suspend ||
1400                       ud->device.driver->suspend(&ud->device, PMSG_SUSPEND)))
1401                         device_release_driver(&ud->device);
1402         }
1403         up(&nodemgr_ud_class.sem);
1404 }
1405
1406
1407 static void nodemgr_resume_ne(struct node_entry *ne)
1408 {
1409         struct device *dev;
1410         struct unit_directory *ud;
1411
1412         ne->in_limbo = 0;
1413         device_remove_file(&ne->device, &dev_attr_ne_in_limbo);
1414
1415         down(&nodemgr_ud_class.sem);
1416         list_for_each_entry(dev, &nodemgr_ud_class.devices, node) {
1417                 ud = container_of(dev, struct unit_directory, unit_dev);
1418                 if (ud->ne != ne)
1419                         continue;
1420
1421                 if (ud->device.driver && ud->device.driver->resume)
1422                         ud->device.driver->resume(&ud->device);
1423         }
1424         up(&nodemgr_ud_class.sem);
1425
1426         HPSB_DEBUG("Node resumed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1427                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1428 }
1429
1430
1431 static void nodemgr_update_pdrv(struct node_entry *ne)
1432 {
1433         struct unit_directory *ud;
1434         struct hpsb_protocol_driver *pdrv;
1435         struct device *dev;
1436
1437         down(&nodemgr_ud_class.sem);
1438         list_for_each_entry(dev, &nodemgr_ud_class.devices, node) {
1439                 ud = container_of(dev, struct unit_directory, unit_dev);
1440                 if (ud->ne != ne)
1441                         continue;
1442
1443                 if (ud->device.driver) {
1444                         pdrv = container_of(ud->device.driver,
1445                                             struct hpsb_protocol_driver,
1446                                             driver);
1447                         if (pdrv->update && pdrv->update(ud))
1448                                 device_release_driver(&ud->device);
1449                 }
1450         }
1451         up(&nodemgr_ud_class.sem);
1452 }
1453
1454
1455 /* Write the BROADCAST_CHANNEL as per IEEE1394a 8.3.2.3.11 and 8.4.2.3.  This
1456  * seems like an optional service but in the end it is practically mandatory
1457  * as a consequence of these clauses.
1458  *
1459  * Note that we cannot do a broadcast write to all nodes at once because some
1460  * pre-1394a devices would hang. */
1461 static void nodemgr_irm_write_bc(struct node_entry *ne, int generation)
1462 {
1463         const u64 bc_addr = (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL);
1464         quadlet_t bc_remote, bc_local;
1465         int error;
1466
1467         if (!ne->host->is_irm || ne->generation != generation ||
1468             ne->nodeid == ne->host->node_id)
1469                 return;
1470
1471         bc_local = cpu_to_be32(ne->host->csr.broadcast_channel);
1472
1473         /* Check if the register is implemented and 1394a compliant. */
1474         error = hpsb_read(ne->host, ne->nodeid, generation, bc_addr, &bc_remote,
1475                           sizeof(bc_remote));
1476         if (!error && bc_remote & cpu_to_be32(0x80000000) &&
1477             bc_remote != bc_local)
1478                 hpsb_node_write(ne, bc_addr, &bc_local, sizeof(bc_local));
1479 }
1480
1481
1482 static void nodemgr_probe_ne(struct host_info *hi, struct node_entry *ne, int generation)
1483 {
1484         struct device *dev;
1485
1486         if (ne->host != hi->host || ne->in_limbo)
1487                 return;
1488
1489         dev = get_device(&ne->device);
1490         if (!dev)
1491                 return;
1492
1493         nodemgr_irm_write_bc(ne, generation);
1494
1495         /* If "needs_probe", then this is either a new or changed node we
1496          * rescan totally. If the generation matches for an existing node
1497          * (one that existed prior to the bus reset) we send update calls
1498          * down to the drivers. Otherwise, this is a dead node and we
1499          * suspend it. */
1500         if (ne->needs_probe)
1501                 nodemgr_process_root_directory(hi, ne);
1502         else if (ne->generation == generation)
1503                 nodemgr_update_pdrv(ne);
1504         else
1505                 nodemgr_suspend_ne(ne);
1506
1507         put_device(dev);
1508 }
1509
1510
1511 static void nodemgr_node_probe(struct host_info *hi, int generation)
1512 {
1513         struct hpsb_host *host = hi->host;
1514         struct device *dev;
1515         struct node_entry *ne;
1516
1517         /* Do some processing of the nodes we've probed. This pulls them
1518          * into the sysfs layer if needed, and can result in processing of
1519          * unit-directories, or just updating the node and it's
1520          * unit-directories.
1521          *
1522          * Run updates before probes. Usually, updates are time-critical
1523          * while probes are time-consuming. (Well, those probes need some
1524          * improvement...) */
1525
1526         down(&nodemgr_ne_class.sem);
1527         list_for_each_entry(dev, &nodemgr_ne_class.devices, node) {
1528                 ne = container_of(dev, struct node_entry, node_dev);
1529                 if (!ne->needs_probe)
1530                         nodemgr_probe_ne(hi, ne, generation);
1531         }
1532         list_for_each_entry(dev, &nodemgr_ne_class.devices, node) {
1533                 ne = container_of(dev, struct node_entry, node_dev);
1534                 if (ne->needs_probe)
1535                         nodemgr_probe_ne(hi, ne, generation);
1536         }
1537         up(&nodemgr_ne_class.sem);
1538
1539
1540         /* If we had a bus reset while we were scanning the bus, it is
1541          * possible that we did not probe all nodes.  In that case, we
1542          * skip the clean up for now, since we could remove nodes that
1543          * were still on the bus.  Another bus scan is pending which will
1544          * do the clean up eventually.
1545          *
1546          * Now let's tell the bus to rescan our devices. This may seem
1547          * like overhead, but the driver-model core will only scan a
1548          * device for a driver when either the device is added, or when a
1549          * new driver is added. A bus reset is a good reason to rescan
1550          * devices that were there before.  For example, an sbp2 device
1551          * may become available for login, if the host that held it was
1552          * just removed.  */
1553
1554         if (generation == get_hpsb_generation(host))
1555                 if (bus_rescan_devices(&ieee1394_bus_type))
1556                         HPSB_DEBUG("bus_rescan_devices had an error");
1557 }
1558
1559 static int nodemgr_send_resume_packet(struct hpsb_host *host)
1560 {
1561         struct hpsb_packet *packet;
1562         int error = -ENOMEM;
1563
1564         packet = hpsb_make_phypacket(host,
1565                         EXTPHYPACKET_TYPE_RESUME |
1566                         NODEID_TO_NODE(host->node_id) << PHYPACKET_PORT_SHIFT);
1567         if (packet) {
1568                 packet->no_waiter = 1;
1569                 packet->generation = get_hpsb_generation(host);
1570                 error = hpsb_send_packet(packet);
1571         }
1572         if (error)
1573                 HPSB_WARN("fw-host%d: Failed to broadcast resume packet",
1574                           host->id);
1575         return error;
1576 }
1577
1578 /* Perform a few high-level IRM responsibilities. */
1579 static int nodemgr_do_irm_duties(struct hpsb_host *host, int cycles)
1580 {
1581         quadlet_t bc;
1582
1583         /* if irm_id == -1 then there is no IRM on this bus */
1584         if (!host->is_irm || host->irm_id == (nodeid_t)-1)
1585                 return 1;
1586
1587         /* We are a 1394a-2000 compliant IRM. Set the validity bit. */
1588         host->csr.broadcast_channel |= 0x40000000;
1589
1590         /* If there is no bus manager then we should set the root node's
1591          * force_root bit to promote bus stability per the 1394
1592          * spec. (8.4.2.6) */
1593         if (host->busmgr_id == 0xffff && host->node_count > 1)
1594         {
1595                 u16 root_node = host->node_count - 1;
1596
1597                 /* get cycle master capability flag from root node */
1598                 if (host->is_cycmst ||
1599                     (!hpsb_read(host, LOCAL_BUS | root_node, get_hpsb_generation(host),
1600                                 (CSR_REGISTER_BASE + CSR_CONFIG_ROM + 2 * sizeof(quadlet_t)),
1601                                 &bc, sizeof(quadlet_t)) &&
1602                      be32_to_cpu(bc) & 1 << CSR_CMC_SHIFT))
1603                         hpsb_send_phy_config(host, root_node, -1);
1604                 else {
1605                         HPSB_DEBUG("The root node is not cycle master capable; "
1606                                    "selecting a new root node and resetting...");
1607
1608                         if (cycles >= 5) {
1609                                 /* Oh screw it! Just leave the bus as it is */
1610                                 HPSB_DEBUG("Stopping reset loop for IRM sanity");
1611                                 return 1;
1612                         }
1613
1614                         hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1615                         hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1616
1617                         return 0;
1618                 }
1619         }
1620
1621         /* Some devices suspend their ports while being connected to an inactive
1622          * host adapter, i.e. if connected before the low-level driver is
1623          * loaded.  They become visible either when physically unplugged and
1624          * replugged, or when receiving a resume packet.  Send one once. */
1625         if (!host->resume_packet_sent && !nodemgr_send_resume_packet(host))
1626                 host->resume_packet_sent = 1;
1627
1628         return 1;
1629 }
1630
1631 /* We need to ensure that if we are not the IRM, that the IRM node is capable of
1632  * everything we can do, otherwise issue a bus reset and try to become the IRM
1633  * ourselves. */
1634 static int nodemgr_check_irm_capability(struct hpsb_host *host, int cycles)
1635 {
1636         quadlet_t bc;
1637         int status;
1638
1639         if (hpsb_disable_irm || host->is_irm)
1640                 return 1;
1641
1642         status = hpsb_read(host, LOCAL_BUS | (host->irm_id),
1643                            get_hpsb_generation(host),
1644                            (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL),
1645                            &bc, sizeof(quadlet_t));
1646
1647         if (status < 0 || !(be32_to_cpu(bc) & 0x80000000)) {
1648                 /* The current irm node does not have a valid BROADCAST_CHANNEL
1649                  * register and we do, so reset the bus with force_root set */
1650                 HPSB_DEBUG("Current remote IRM is not 1394a-2000 compliant, 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         return 1;
1665 }
1666
1667 static int nodemgr_host_thread(void *__hi)
1668 {
1669         struct host_info *hi = (struct host_info *)__hi;
1670         struct hpsb_host *host = hi->host;
1671         unsigned int g, generation = 0;
1672         int i, reset_cycles = 0;
1673
1674         /* Setup our device-model entries */
1675         nodemgr_create_host_dev_files(host);
1676
1677         for (;;) {
1678                 /* Sleep until next bus reset */
1679                 set_current_state(TASK_INTERRUPTIBLE);
1680                 if (get_hpsb_generation(host) == generation &&
1681                     !kthread_should_stop())
1682                         schedule();
1683                 __set_current_state(TASK_RUNNING);
1684
1685                 /* Thread may have been woken up to freeze or to exit */
1686                 if (try_to_freeze())
1687                         continue;
1688                 if (kthread_should_stop())
1689                         goto exit;
1690
1691                 if (mutex_lock_interruptible(&nodemgr_serialize)) {
1692                         if (try_to_freeze())
1693                                 continue;
1694                         goto exit;
1695                 }
1696
1697                 /* Pause for 1/4 second in 1/16 second intervals,
1698                  * to make sure things settle down. */
1699                 g = get_hpsb_generation(host);
1700                 for (i = 0; i < 4 ; i++) {
1701                         if (msleep_interruptible(63) || kthread_should_stop())
1702                                 goto unlock_exit;
1703
1704                         /* Now get the generation in which the node ID's we collect
1705                          * are valid.  During the bus scan we will use this generation
1706                          * for the read transactions, so that if another reset occurs
1707                          * during the scan the transactions will fail instead of
1708                          * returning bogus data. */
1709                         generation = get_hpsb_generation(host);
1710
1711                         /* If we get a reset before we are done waiting, then
1712                          * start the waiting over again */
1713                         if (generation != g)
1714                                 g = generation, i = 0;
1715                 }
1716
1717                 if (!nodemgr_check_irm_capability(host, reset_cycles) ||
1718                     !nodemgr_do_irm_duties(host, reset_cycles)) {
1719                         reset_cycles++;
1720                         mutex_unlock(&nodemgr_serialize);
1721                         continue;
1722                 }
1723                 reset_cycles = 0;
1724
1725                 /* Scan our nodes to get the bus options and create node
1726                  * entries. This does not do the sysfs stuff, since that
1727                  * would trigger uevents and such, which is a bad idea at
1728                  * this point. */
1729                 nodemgr_node_scan(hi, generation);
1730
1731                 /* This actually does the full probe, with sysfs
1732                  * registration. */
1733                 nodemgr_node_probe(hi, generation);
1734
1735                 /* Update some of our sysfs symlinks */
1736                 nodemgr_update_host_dev_links(host);
1737
1738                 mutex_unlock(&nodemgr_serialize);
1739         }
1740 unlock_exit:
1741         mutex_unlock(&nodemgr_serialize);
1742 exit:
1743         HPSB_VERBOSE("NodeMgr: Exiting thread");
1744         return 0;
1745 }
1746
1747 /**
1748  * nodemgr_for_each_host - call a function for each IEEE 1394 host
1749  * @data: an address to supply to the callback
1750  * @cb: function to call for each host
1751  *
1752  * Iterate the hosts, calling a given function with supplied data for each host.
1753  * If the callback fails on a host, i.e. if it returns a non-zero value, the
1754  * iteration is stopped.
1755  *
1756  * Return value: 0 on success, non-zero on failure (same as returned by last run
1757  * of the callback).
1758  */
1759 int nodemgr_for_each_host(void *data, int (*cb)(struct hpsb_host *, void *))
1760 {
1761         struct device *dev;
1762         struct hpsb_host *host;
1763         int error = 0;
1764
1765         down(&hpsb_host_class.sem);
1766         list_for_each_entry(dev, &hpsb_host_class.devices, node) {
1767                 host = container_of(dev, struct hpsb_host, host_dev);
1768
1769                 if ((error = cb(host, data)))
1770                         break;
1771         }
1772         up(&hpsb_host_class.sem);
1773
1774         return error;
1775 }
1776
1777 /* The following two convenience functions use a struct node_entry
1778  * for addressing a node on the bus.  They are intended for use by any
1779  * process context, not just the nodemgr thread, so we need to be a
1780  * little careful when reading out the node ID and generation.  The
1781  * thing that can go wrong is that we get the node ID, then a bus
1782  * reset occurs, and then we read the generation.  The node ID is
1783  * possibly invalid, but the generation is current, and we end up
1784  * sending a packet to a the wrong node.
1785  *
1786  * The solution is to make sure we read the generation first, so that
1787  * if a reset occurs in the process, we end up with a stale generation
1788  * and the transactions will fail instead of silently using wrong node
1789  * ID's.
1790  */
1791
1792 /**
1793  * hpsb_node_fill_packet - fill some destination information into a packet
1794  * @ne: destination node
1795  * @packet: packet to fill in
1796  *
1797  * This will fill in the given, pre-initialised hpsb_packet with the current
1798  * information from the node entry (host, node ID, bus generation number).
1799  */
1800 void hpsb_node_fill_packet(struct node_entry *ne, struct hpsb_packet *packet)
1801 {
1802         packet->host = ne->host;
1803         packet->generation = ne->generation;
1804         barrier();
1805         packet->node_id = ne->nodeid;
1806 }
1807
1808 int hpsb_node_write(struct node_entry *ne, u64 addr,
1809                     quadlet_t *buffer, size_t length)
1810 {
1811         unsigned int generation = ne->generation;
1812
1813         barrier();
1814         return hpsb_write(ne->host, ne->nodeid, generation,
1815                           addr, buffer, length);
1816 }
1817
1818 static void nodemgr_add_host(struct hpsb_host *host)
1819 {
1820         struct host_info *hi;
1821
1822         hi = hpsb_create_hostinfo(&nodemgr_highlevel, host, sizeof(*hi));
1823         if (!hi) {
1824                 HPSB_ERR("NodeMgr: out of memory in add host");
1825                 return;
1826         }
1827         hi->host = host;
1828         hi->thread = kthread_run(nodemgr_host_thread, hi, "knodemgrd_%d",
1829                                  host->id);
1830         if (IS_ERR(hi->thread)) {
1831                 HPSB_ERR("NodeMgr: cannot start thread for host %d", host->id);
1832                 hpsb_destroy_hostinfo(&nodemgr_highlevel, host);
1833         }
1834 }
1835
1836 static void nodemgr_host_reset(struct hpsb_host *host)
1837 {
1838         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1839
1840         if (hi) {
1841                 HPSB_VERBOSE("NodeMgr: Processing reset for host %d", host->id);
1842                 wake_up_process(hi->thread);
1843         }
1844 }
1845
1846 static void nodemgr_remove_host(struct hpsb_host *host)
1847 {
1848         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1849
1850         if (hi) {
1851                 kthread_stop(hi->thread);
1852                 nodemgr_remove_host_dev(&host->device);
1853         }
1854 }
1855
1856 static struct hpsb_highlevel nodemgr_highlevel = {
1857         .name =         "Node manager",
1858         .add_host =     nodemgr_add_host,
1859         .host_reset =   nodemgr_host_reset,
1860         .remove_host =  nodemgr_remove_host,
1861 };
1862
1863 int init_ieee1394_nodemgr(void)
1864 {
1865         int error;
1866
1867         error = class_register(&nodemgr_ne_class);
1868         if (error)
1869                 goto fail_ne;
1870         error = class_register(&nodemgr_ud_class);
1871         if (error)
1872                 goto fail_ud;
1873         error = driver_register(&nodemgr_mid_layer_driver);
1874         if (error)
1875                 goto fail_ml;
1876         /* This driver is not used if nodemgr is off (disable_nodemgr=1). */
1877         nodemgr_dev_template_host.driver = &nodemgr_mid_layer_driver;
1878
1879         hpsb_register_highlevel(&nodemgr_highlevel);
1880         return 0;
1881
1882 fail_ml:
1883         class_unregister(&nodemgr_ud_class);
1884 fail_ud:
1885         class_unregister(&nodemgr_ne_class);
1886 fail_ne:
1887         return error;
1888 }
1889
1890 void cleanup_ieee1394_nodemgr(void)
1891 {
1892         hpsb_unregister_highlevel(&nodemgr_highlevel);
1893         driver_unregister(&nodemgr_mid_layer_driver);
1894         class_unregister(&nodemgr_ud_class);
1895         class_unregister(&nodemgr_ne_class);
1896 }