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 *ud, **unreg;
 758         size_t i, count;
 759
 760         /*
 761          * This is awkward:
 762          * Iteration over nodemgr_ud_class.children has to be protected by
 763          * nodemgr_ud_class.sem, but class_device_unregister() will eventually
 764          * take nodemgr_ud_class.sem too. Therefore store all uds to be
 765          * unregistered in a temporary array, release the semaphore, and then
 766          * unregister the uds.
 767          *
 768          * Since nodemgr_remove_uds can also run in other contexts than the
 769          * knodemgrds (which are currently globally serialized), protect the
 770          * gap after release of the semaphore by nodemgr_serialize_remove_uds.
 771          */
 772
 773         mutex_lock(&nodemgr_serialize_remove_uds);
 774
 775         down(&nodemgr_ud_class.sem);
 776         count = 0;
 777         list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
 778                 ud = container_of(cdev, struct unit_directory, class_dev);
 779                 if (ud->ne == ne)
 780                         count++;
 781         }
 782         if (!count) {
 783                 up(&nodemgr_ud_class.sem);
 784                 mutex_unlock(&nodemgr_serialize_remove_uds);
 785                 return;
 786         }
 787         unreg = kcalloc(count, sizeof(*unreg), GFP_KERNEL);
 788         if (!unreg) {
 789                 HPSB_ERR("NodeMgr: out of memory in nodemgr_remove_uds");
 790                 up(&nodemgr_ud_class.sem);
 791                 mutex_unlock(&nodemgr_serialize_remove_uds);
 792                 return;
 793         }
 794         i = 0;
 795         list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
 796                 ud = container_of(cdev, struct unit_directory, class_dev);
 797                 if (ud->ne == ne) {
 798                         BUG_ON(i >= count);
 799                         unreg[i++] = ud;
 800                 }
 801         }
 802         up(&nodemgr_ud_class.sem);
 803
 804         for (i = 0; i < count; i++) {
 805                 class_device_unregister(&unreg[i]->class_dev);
 806                 device_unregister(&unreg[i]->device);
 807         }
 808         kfree(unreg);
 809
 810         mutex_unlock(&nodemgr_serialize_remove_uds);
 811 }
 812
 813
 814 static void nodemgr_remove_ne(struct node_entry *ne)
 815 {
 816         struct device *dev;
 817
 818         dev = get_device(&ne->device);
 819         if (!dev)
 820                 return;
 821
 822         HPSB_DEBUG("Node removed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 823                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
 824
 825         nodemgr_remove_uds(ne);
 826
 827         class_device_unregister(&ne->class_dev);
 828         device_unregister(dev);
 829
 830         put_device(dev);
 831 }
 832
 833 static int __nodemgr_remove_host_dev(struct device *dev, void *data)
 834 {
 835         nodemgr_remove_ne(container_of(dev, struct node_entry, device));
 836         return 0;
 837 }
 838
 839 static void nodemgr_remove_host_dev(struct device *dev)
 840 {
 841         WARN_ON(device_for_each_child(dev, NULL, __nodemgr_remove_host_dev));
 842         sysfs_remove_link(&dev->kobj, "irm_id");
 843         sysfs_remove_link(&dev->kobj, "busmgr_id");
 844         sysfs_remove_link(&dev->kobj, "host_id");
 845 }
 846
 847
 848 static void nodemgr_update_bus_options(struct node_entry *ne)
 849 {
 850 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
 851         static const u16 mr[] = { 4, 64, 1024, 0};
 852 #endif
 853         quadlet_t busoptions = be32_to_cpu(ne->csr->bus_info_data[2]);
 854
 855         ne->busopt.irmc         = (busoptions >> 31) & 1;
 856         ne->busopt.cmc          = (busoptions >> 30) & 1;
 857         ne->busopt.isc          = (busoptions >> 29) & 1;
 858         ne->busopt.bmc          = (busoptions >> 28) & 1;
 859         ne->busopt.pmc          = (busoptions >> 27) & 1;
 860         ne->busopt.cyc_clk_acc  = (busoptions >> 16) & 0xff;
 861         ne->busopt.max_rec      = 1 << (((busoptions >> 12) & 0xf) + 1);
 862         ne->busopt.max_rom      = (busoptions >> 8) & 0x3;
 863         ne->busopt.generation   = (busoptions >> 4) & 0xf;
 864         ne->busopt.lnkspd       = busoptions & 0x7;
 865
 866         HPSB_VERBOSE("NodeMgr: raw=0x%08x irmc=%d cmc=%d isc=%d bmc=%d pmc=%d "
 867                      "cyc_clk_acc=%d max_rec=%d max_rom=%d gen=%d lspd=%d",
 868                      busoptions, ne->busopt.irmc, ne->busopt.cmc,
 869                      ne->busopt.isc, ne->busopt.bmc, ne->busopt.pmc,
 870                      ne->busopt.cyc_clk_acc, ne->busopt.max_rec,
 871                      mr[ne->busopt.max_rom],
 872                      ne->busopt.generation, ne->busopt.lnkspd);
 873 }
 874
 875
 876 static struct node_entry *nodemgr_create_node(octlet_t guid, struct csr1212_csr *csr,
 877                                               struct host_info *hi, nodeid_t nodeid,
 878                                               unsigned int generation)
 879 {
 880         struct hpsb_host *host = hi->host;
 881         struct node_entry *ne;
 882
 883         ne = kzalloc(sizeof(*ne), GFP_KERNEL);
 884         if (!ne)
 885                 goto fail_alloc;
 886
 887         ne->host = host;
 888         ne->nodeid = nodeid;
 889         ne->generation = generation;
 890         ne->needs_probe = 1;
 891
 892         ne->guid = guid;
 893         ne->guid_vendor_id = (guid >> 40) & 0xffffff;
 894         ne->guid_vendor_oui = nodemgr_find_oui_name(ne->guid_vendor_id);
 895         ne->csr = csr;
 896
 897         memcpy(&ne->device, &nodemgr_dev_template_ne,
 898                sizeof(ne->device));
 899         ne->device.parent = &host->device;
 900         snprintf(ne->device.bus_id, BUS_ID_SIZE, "%016Lx",
 901                  (unsigned long long)(ne->guid));
 902
 903         ne->class_dev.dev = &ne->device;
 904         ne->class_dev.class = &nodemgr_ne_class;
 905         snprintf(ne->class_dev.class_id, BUS_ID_SIZE, "%016Lx",
 906                  (unsigned long long)(ne->guid));
 907
 908         if (device_register(&ne->device))
 909                 goto fail_devreg;
 910         if (class_device_register(&ne->class_dev))
 911                 goto fail_classdevreg;
 912         get_device(&ne->device);
 913
 914         if (ne->guid_vendor_oui &&
 915             device_create_file(&ne->device, &dev_attr_ne_guid_vendor_oui))
 916                 goto fail_addoiu;
 917         nodemgr_create_ne_dev_files(ne);
 918
 919         nodemgr_update_bus_options(ne);
 920
 921         HPSB_DEBUG("%s added: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 922                    (host->node_id == nodeid) ? "Host" : "Node",
 923                    NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
 924
 925         return ne;
 926
 927 fail_addoiu:
 928         put_device(&ne->device);
 929 fail_classdevreg:
 930         device_unregister(&ne->device);
 931 fail_devreg:
 932         kfree(ne);
 933 fail_alloc:
 934         HPSB_ERR("Failed to create node ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 935                  NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
 936
 937         return NULL;
 938 }
 939
 940
 941 static struct node_entry *find_entry_by_guid(u64 guid)
 942 {
 943         struct class_device *cdev;
 944         struct node_entry *ne, *ret_ne = NULL;
 945
 946         down(&nodemgr_ne_class.sem);
 947         list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
 948                 ne = container_of(cdev, struct node_entry, class_dev);
 949
 950                 if (ne->guid == guid) {
 951                         ret_ne = ne;
 952                         break;
 953                 }
 954         }
 955         up(&nodemgr_ne_class.sem);
 956
 957         return ret_ne;
 958 }
 959
 960
 961 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
 962                                                nodeid_t nodeid)
 963 {
 964         struct class_device *cdev;
 965         struct node_entry *ne, *ret_ne = NULL;
 966
 967         down(&nodemgr_ne_class.sem);
 968         list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
 969                 ne = container_of(cdev, struct node_entry, class_dev);
 970
 971                 if (ne->host == host && ne->nodeid == nodeid) {
 972                         ret_ne = ne;
 973                         break;
 974                 }
 975         }
 976         up(&nodemgr_ne_class.sem);
 977
 978         return ret_ne;
 979 }
 980
 981
 982 static void nodemgr_register_device(struct node_entry *ne,
 983         struct unit_directory *ud, struct device *parent)
 984 {
 985         memcpy(&ud->device, &nodemgr_dev_template_ud,
 986                sizeof(ud->device));
 987
 988         ud->device.parent = parent;
 989
 990         snprintf(ud->device.bus_id, BUS_ID_SIZE, "%s-%u",
 991                  ne->device.bus_id, ud->id);
 992
 993         ud->class_dev.dev = &ud->device;
 994         ud->class_dev.class = &nodemgr_ud_class;
 995         snprintf(ud->class_dev.class_id, BUS_ID_SIZE, "%s-%u",
 996                  ne->device.bus_id, ud->id);
 997
 998         if (device_register(&ud->device))
 999                 goto fail_devreg;
1000         if (class_device_register(&ud->class_dev))
1001                 goto fail_classdevreg;
1002         get_device(&ud->device);
1003
1004         if (ud->vendor_oui &&
1005             device_create_file(&ud->device, &dev_attr_ud_vendor_oui))
1006                 goto fail_addoui;
1007         nodemgr_create_ud_dev_files(ud);
1008
1009         return;
1010
1011 fail_addoui:
1012         put_device(&ud->device);
1013 fail_classdevreg:
1014         device_unregister(&ud->device);
1015 fail_devreg:
1016         HPSB_ERR("Failed to create unit %s", ud->device.bus_id);
1017 }
1018
1019
1020 /* This implementation currently only scans the config rom and its
1021  * immediate unit directories looking for software_id and
1022  * software_version entries, in order to get driver autoloading working. */
1023 static struct unit_directory *nodemgr_process_unit_directory
1024         (struct host_info *hi, struct node_entry *ne, struct csr1212_keyval *ud_kv,
1025          unsigned int *id, struct unit_directory *parent)
1026 {
1027         struct unit_directory *ud;
1028         struct unit_directory *ud_child = NULL;
1029         struct csr1212_dentry *dentry;
1030         struct csr1212_keyval *kv;
1031         u8 last_key_id = 0;
1032
1033         ud = kzalloc(sizeof(*ud), GFP_KERNEL);
1034         if (!ud)
1035                 goto unit_directory_error;
1036
1037         ud->ne = ne;
1038         ud->ignore_driver = ignore_drivers;
1039         ud->address = ud_kv->offset + CSR1212_CONFIG_ROM_SPACE_BASE;
1040         ud->ud_kv = ud_kv;
1041         ud->id = (*id)++;
1042
1043         csr1212_for_each_dir_entry(ne->csr, kv, ud_kv, dentry) {
1044                 switch (kv->key.id) {
1045                 case CSR1212_KV_ID_VENDOR:
1046                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
1047                                 ud->vendor_id = kv->value.immediate;
1048                                 ud->flags |= UNIT_DIRECTORY_VENDOR_ID;
1049
1050                                 if (ud->vendor_id)
1051                                         ud->vendor_oui = nodemgr_find_oui_name(ud->vendor_id);
1052                         }
1053                         break;
1054
1055                 case CSR1212_KV_ID_MODEL:
1056                         ud->model_id = kv->value.immediate;
1057                         ud->flags |= UNIT_DIRECTORY_MODEL_ID;
1058                         break;
1059
1060                 case CSR1212_KV_ID_SPECIFIER_ID:
1061                         ud->specifier_id = kv->value.immediate;
1062                         ud->flags |= UNIT_DIRECTORY_SPECIFIER_ID;
1063                         break;
1064
1065                 case CSR1212_KV_ID_VERSION:
1066                         ud->version = kv->value.immediate;
1067                         ud->flags |= UNIT_DIRECTORY_VERSION;
1068                         break;
1069
1070                 case CSR1212_KV_ID_DESCRIPTOR:
1071                         if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1072                             CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1073                             CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1074                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1075                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1076                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1077                                 switch (last_key_id) {
1078                                 case CSR1212_KV_ID_VENDOR:
1079                                         ud->vendor_name_kv = kv;
1080                                         csr1212_keep_keyval(kv);
1081                                         break;
1082
1083                                 case CSR1212_KV_ID_MODEL:
1084                                         ud->model_name_kv = kv;
1085                                         csr1212_keep_keyval(kv);
1086                                         break;
1087
1088                                 }
1089                         } /* else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) ... */
1090                         break;
1091
1092                 case CSR1212_KV_ID_DEPENDENT_INFO:
1093                         /* Logical Unit Number */
1094                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
1095                                 if (ud->flags & UNIT_DIRECTORY_HAS_LUN) {
1096                                         ud_child = kmemdup(ud, sizeof(*ud_child), GFP_KERNEL);
1097                                         if (!ud_child)
1098                                                 goto unit_directory_error;
1099                                         nodemgr_register_device(ne, ud_child, &ne->device);
1100                                         ud_child = NULL;
1101
1102                                         ud->id = (*id)++;
1103                                 }
1104                                 ud->lun = kv->value.immediate;
1105                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN;
1106
1107                         /* Logical Unit Directory */
1108                         } else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) {
1109                                 /* This should really be done in SBP2 as this is
1110                                  * doing SBP2 specific parsing.
1111                                  */
1112
1113                                 /* first register the parent unit */
1114                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN_DIRECTORY;
1115                                 if (ud->device.bus != &ieee1394_bus_type)
1116                                         nodemgr_register_device(ne, ud, &ne->device);
1117
1118                                 /* process the child unit */
1119                                 ud_child = nodemgr_process_unit_directory(hi, ne, kv, id, ud);
1120
1121                                 if (ud_child == NULL)
1122                                         break;
1123
1124                                 /* inherit unspecified values, the driver core picks it up */
1125                                 if ((ud->flags & UNIT_DIRECTORY_MODEL_ID) &&
1126                                     !(ud_child->flags & UNIT_DIRECTORY_MODEL_ID))
1127                                 {
1128                                         ud_child->flags |=  UNIT_DIRECTORY_MODEL_ID;
1129                                         ud_child->model_id = ud->model_id;
1130                                 }
1131                                 if ((ud->flags & UNIT_DIRECTORY_SPECIFIER_ID) &&
1132                                     !(ud_child->flags & UNIT_DIRECTORY_SPECIFIER_ID))
1133                                 {
1134                                         ud_child->flags |=  UNIT_DIRECTORY_SPECIFIER_ID;
1135                                         ud_child->specifier_id = ud->specifier_id;
1136                                 }
1137                                 if ((ud->flags & UNIT_DIRECTORY_VERSION) &&
1138                                     !(ud_child->flags & UNIT_DIRECTORY_VERSION))
1139                                 {
1140                                         ud_child->flags |=  UNIT_DIRECTORY_VERSION;
1141                                         ud_child->version = ud->version;
1142                                 }
1143
1144                                 /* register the child unit */
1145                                 ud_child->flags |= UNIT_DIRECTORY_LUN_DIRECTORY;
1146                                 nodemgr_register_device(ne, ud_child, &ud->device);
1147                         }
1148
1149                         break;
1150
1151                 default:
1152                         break;
1153                 }
1154                 last_key_id = kv->key.id;
1155         }
1156
1157         /* do not process child units here and only if not already registered */
1158         if (!parent && ud->device.bus != &ieee1394_bus_type)
1159                 nodemgr_register_device(ne, ud, &ne->device);
1160
1161         return ud;
1162
1163 unit_directory_error:
1164         kfree(ud);
1165         return NULL;
1166 }
1167
1168
1169 static void nodemgr_process_root_directory(struct host_info *hi, struct node_entry *ne)
1170 {
1171         unsigned int ud_id = 0;
1172         struct csr1212_dentry *dentry;
1173         struct csr1212_keyval *kv;
1174         u8 last_key_id = 0;
1175
1176         ne->needs_probe = 0;
1177
1178         csr1212_for_each_dir_entry(ne->csr, kv, ne->csr->root_kv, dentry) {
1179                 switch (kv->key.id) {
1180                 case CSR1212_KV_ID_VENDOR:
1181                         ne->vendor_id = kv->value.immediate;
1182
1183                         if (ne->vendor_id)
1184                                 ne->vendor_oui = nodemgr_find_oui_name(ne->vendor_id);
1185                         break;
1186
1187                 case CSR1212_KV_ID_NODE_CAPABILITIES:
1188                         ne->capabilities = kv->value.immediate;
1189                         break;
1190
1191                 case CSR1212_KV_ID_UNIT:
1192                         nodemgr_process_unit_directory(hi, ne, kv, &ud_id, NULL);
1193                         break;
1194
1195                 case CSR1212_KV_ID_DESCRIPTOR:
1196                         if (last_key_id == CSR1212_KV_ID_VENDOR) {
1197                                 if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1198                                     CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1199                                     CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1200                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1201                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1202                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1203                                         ne->vendor_name_kv = kv;
1204                                         csr1212_keep_keyval(kv);
1205                                 }
1206                         }
1207                         break;
1208                 }
1209                 last_key_id = kv->key.id;
1210         }
1211
1212         if (ne->vendor_oui &&
1213             device_create_file(&ne->device, &dev_attr_ne_vendor_oui))
1214                 goto fail;
1215         if (ne->vendor_name_kv &&
1216             device_create_file(&ne->device, &dev_attr_ne_vendor_name_kv))
1217                 goto fail;
1218         return;
1219 fail:
1220         HPSB_ERR("Failed to add sysfs attribute for node %016Lx",
1221                  (unsigned long long)ne->guid);
1222 }
1223
1224 #ifdef CONFIG_HOTPLUG
1225
1226 static int nodemgr_uevent(struct class_device *cdev, char **envp, int num_envp,
1227                           char *buffer, int buffer_size)
1228 {
1229         struct unit_directory *ud;
1230         int i = 0;
1231         int length = 0;
1232         /* ieee1394:venNmoNspNverN */
1233         char buf[8 + 1 + 3 + 8 + 2 + 8 + 2 + 8 + 3 + 8 + 1];
1234
1235         if (!cdev)
1236                 return -ENODEV;
1237
1238         ud = container_of(cdev, struct unit_directory, class_dev);
1239
1240         if (ud->ne->in_limbo || ud->ignore_driver)
1241                 return -ENODEV;
1242
1243 #define PUT_ENVP(fmt,val)                                       \
1244 do {                                                            \
1245         int printed;                                            \
1246         envp[i++] = buffer;                                     \
1247         printed = snprintf(buffer, buffer_size - length,        \
1248                            fmt, val);                           \
1249         if ((buffer_size - (length+printed) <= 0) || (i >= num_envp))   \
1250                 return -ENOMEM;                                 \
1251         length += printed+1;                                    \
1252         buffer += printed+1;                                    \
1253 } while (0)
1254
1255         PUT_ENVP("VENDOR_ID=%06x", ud->vendor_id);
1256         PUT_ENVP("MODEL_ID=%06x", ud->model_id);
1257         PUT_ENVP("GUID=%016Lx", (unsigned long long)ud->ne->guid);
1258         PUT_ENVP("SPECIFIER_ID=%06x", ud->specifier_id);
1259         PUT_ENVP("VERSION=%06x", ud->version);
1260         snprintf(buf, sizeof(buf), "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
1261                         ud->vendor_id,
1262                         ud->model_id,
1263                         ud->specifier_id,
1264                         ud->version);
1265         PUT_ENVP("MODALIAS=%s", buf);
1266
1267 #undef PUT_ENVP
1268
1269         envp[i] = NULL;
1270
1271         return 0;
1272 }
1273
1274 #else
1275
1276 static int nodemgr_uevent(struct class_device *cdev, char **envp, int num_envp,
1277                           char *buffer, int buffer_size)
1278 {
1279         return -ENODEV;
1280 }
1281
1282 #endif /* CONFIG_HOTPLUG */
1283
1284
1285 int hpsb_register_protocol(struct hpsb_protocol_driver *driver)
1286 {
1287         /* This will cause a probe for devices */
1288         int error = driver_register(&driver->driver);
1289         if (!error)
1290                 nodemgr_create_drv_files(driver);
1291         return error;
1292 }
1293
1294 void hpsb_unregister_protocol(struct hpsb_protocol_driver *driver)
1295 {
1296         nodemgr_remove_drv_files(driver);
1297         /* This will subsequently disconnect all devices that our driver
1298          * is attached to. */
1299         driver_unregister(&driver->driver);
1300 }
1301
1302
1303 /*
1304  * This function updates nodes that were present on the bus before the
1305  * reset and still are after the reset.  The nodeid and the config rom
1306  * may have changed, and the drivers managing this device must be
1307  * informed that this device just went through a bus reset, to allow
1308  * the to take whatever actions required.
1309  */
1310 static void nodemgr_update_node(struct node_entry *ne, struct csr1212_csr *csr,
1311                                 struct host_info *hi, nodeid_t nodeid,
1312                                 unsigned int generation)
1313 {
1314         if (ne->nodeid != nodeid) {
1315                 HPSB_DEBUG("Node changed: " NODE_BUS_FMT " -> " NODE_BUS_FMT,
1316                            NODE_BUS_ARGS(ne->host, ne->nodeid),
1317                            NODE_BUS_ARGS(ne->host, nodeid));
1318                 ne->nodeid = nodeid;
1319         }
1320
1321         if (ne->busopt.generation != ((be32_to_cpu(csr->bus_info_data[2]) >> 4) & 0xf)) {
1322                 kfree(ne->csr->private);
1323                 csr1212_destroy_csr(ne->csr);
1324                 ne->csr = csr;
1325
1326                 /* If the node's configrom generation has changed, we
1327                  * unregister all the unit directories. */
1328                 nodemgr_remove_uds(ne);
1329
1330                 nodemgr_update_bus_options(ne);
1331
1332                 /* Mark the node as new, so it gets re-probed */
1333                 ne->needs_probe = 1;
1334         } else {
1335                 /* old cache is valid, so update its generation */
1336                 struct nodemgr_csr_info *ci = ne->csr->private;
1337                 ci->generation = generation;
1338                 /* free the partially filled now unneeded new cache */
1339                 kfree(csr->private);
1340                 csr1212_destroy_csr(csr);
1341         }
1342
1343         if (ne->in_limbo)
1344                 nodemgr_resume_ne(ne);
1345
1346         /* Mark the node current */
1347         ne->generation = generation;
1348 }
1349
1350
1351
1352 static void nodemgr_node_scan_one(struct host_info *hi,
1353                                   nodeid_t nodeid, int generation)
1354 {
1355         struct hpsb_host *host = hi->host;
1356         struct node_entry *ne;
1357         octlet_t guid;
1358         struct csr1212_csr *csr;
1359         struct nodemgr_csr_info *ci;
1360         u8 *speed;
1361
1362         ci = kmalloc(sizeof(*ci), GFP_KERNEL);
1363         if (!ci)
1364                 return;
1365
1366         ci->host = host;
1367         ci->nodeid = nodeid;
1368         ci->generation = generation;
1369
1370         /* Prepare for speed probe which occurs when reading the ROM */
1371         speed = &(host->speed[NODEID_TO_NODE(nodeid)]);
1372         if (*speed > host->csr.lnk_spd)
1373                 *speed = host->csr.lnk_spd;
1374         ci->speed_unverified = *speed > IEEE1394_SPEED_100;
1375
1376         /* We need to detect when the ConfigROM's generation has changed,
1377          * so we only update the node's info when it needs to be.  */
1378
1379         csr = csr1212_create_csr(&nodemgr_csr_ops, 5 * sizeof(quadlet_t), ci);
1380         if (!csr || csr1212_parse_csr(csr) != CSR1212_SUCCESS) {
1381                 HPSB_ERR("Error parsing configrom for node " NODE_BUS_FMT,
1382                          NODE_BUS_ARGS(host, nodeid));
1383                 if (csr)
1384                         csr1212_destroy_csr(csr);
1385                 kfree(ci);
1386                 return;
1387         }
1388
1389         if (csr->bus_info_data[1] != IEEE1394_BUSID_MAGIC) {
1390                 /* This isn't a 1394 device, but we let it slide. There
1391                  * was a report of a device with broken firmware which
1392                  * reported '2394' instead of '1394', which is obviously a
1393                  * mistake. One would hope that a non-1394 device never
1394                  * gets connected to Firewire bus. If someone does, we
1395                  * shouldn't be held responsible, so we'll allow it with a
1396                  * warning.  */
1397                 HPSB_WARN("Node " NODE_BUS_FMT " has invalid busID magic [0x%08x]",
1398                           NODE_BUS_ARGS(host, nodeid), csr->bus_info_data[1]);
1399         }
1400
1401         guid = ((u64)be32_to_cpu(csr->bus_info_data[3]) << 32) | be32_to_cpu(csr->bus_info_data[4]);
1402         ne = find_entry_by_guid(guid);
1403
1404         if (ne && ne->host != host && ne->in_limbo) {
1405                 /* Must have moved this device from one host to another */
1406                 nodemgr_remove_ne(ne);
1407                 ne = NULL;
1408         }
1409
1410         if (!ne)
1411                 nodemgr_create_node(guid, csr, hi, nodeid, generation);
1412         else
1413                 nodemgr_update_node(ne, csr, hi, nodeid, generation);
1414 }
1415
1416
1417 static void nodemgr_node_scan(struct host_info *hi, int generation)
1418 {
1419         int count;
1420         struct hpsb_host *host = hi->host;
1421         struct selfid *sid = (struct selfid *)host->topology_map;
1422         nodeid_t nodeid = LOCAL_BUS;
1423
1424         /* Scan each node on the bus */
1425         for (count = host->selfid_count; count; count--, sid++) {
1426                 if (sid->extended)
1427                         continue;
1428
1429                 if (!sid->link_active) {
1430                         nodeid++;
1431                         continue;
1432                 }
1433                 nodemgr_node_scan_one(hi, nodeid++, generation);
1434         }
1435 }
1436
1437
1438 static void nodemgr_suspend_ne(struct node_entry *ne)
1439 {
1440         struct class_device *cdev;
1441         struct unit_directory *ud;
1442
1443         HPSB_DEBUG("Node suspended: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1444                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1445
1446         ne->in_limbo = 1;
1447         WARN_ON(device_create_file(&ne->device, &dev_attr_ne_in_limbo));
1448
1449         down(&nodemgr_ud_class.sem);
1450         list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1451                 ud = container_of(cdev, struct unit_directory, class_dev);
1452                 if (ud->ne != ne)
1453                         continue;
1454
1455                 down_write(&ieee1394_bus_type.subsys.rwsem);
1456                 if (ud->device.driver &&
1457                     (!ud->device.driver->suspend ||
1458                       ud->device.driver->suspend(&ud->device, PMSG_SUSPEND)))
1459                         device_release_driver(&ud->device);
1460                 up_write(&ieee1394_bus_type.subsys.rwsem);
1461         }
1462         up(&nodemgr_ud_class.sem);
1463 }
1464
1465
1466 static void nodemgr_resume_ne(struct node_entry *ne)
1467 {
1468         struct class_device *cdev;
1469         struct unit_directory *ud;
1470
1471         ne->in_limbo = 0;
1472         device_remove_file(&ne->device, &dev_attr_ne_in_limbo);
1473
1474         down(&nodemgr_ud_class.sem);
1475         list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1476                 ud = container_of(cdev, struct unit_directory, class_dev);
1477                 if (ud->ne != ne)
1478                         continue;
1479
1480                 down_read(&ieee1394_bus_type.subsys.rwsem);
1481                 if (ud->device.driver && ud->device.driver->resume)
1482                         ud->device.driver->resume(&ud->device);
1483                 up_read(&ieee1394_bus_type.subsys.rwsem);
1484         }
1485         up(&nodemgr_ud_class.sem);
1486
1487         HPSB_DEBUG("Node resumed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1488                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1489 }
1490
1491
1492 static void nodemgr_update_pdrv(struct node_entry *ne)
1493 {
1494         struct unit_directory *ud;
1495         struct hpsb_protocol_driver *pdrv;
1496         struct class_device *cdev;
1497
1498         down(&nodemgr_ud_class.sem);
1499         list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
1500                 ud = container_of(cdev, struct unit_directory, class_dev);
1501                 if (ud->ne != ne)
1502                         continue;
1503
1504                 down_write(&ieee1394_bus_type.subsys.rwsem);
1505                 if (ud->device.driver) {
1506                         pdrv = container_of(ud->device.driver,
1507                                             struct hpsb_protocol_driver,
1508                                             driver);
1509                         if (pdrv->update && pdrv->update(ud))
1510                                 device_release_driver(&ud->device);
1511                 }
1512                 up_write(&ieee1394_bus_type.subsys.rwsem);
1513         }
1514         up(&nodemgr_ud_class.sem);
1515 }
1516
1517
1518 /* Write the BROADCAST_CHANNEL as per IEEE1394a 8.3.2.3.11 and 8.4.2.3.  This
1519  * seems like an optional service but in the end it is practically mandatory
1520  * as a consequence of these clauses.
1521  *
1522  * Note that we cannot do a broadcast write to all nodes at once because some
1523  * pre-1394a devices would hang. */
1524 static void nodemgr_irm_write_bc(struct node_entry *ne, int generation)
1525 {
1526         const u64 bc_addr = (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL);
1527         quadlet_t bc_remote, bc_local;
1528         int error;
1529
1530         if (!ne->host->is_irm || ne->generation != generation ||
1531             ne->nodeid == ne->host->node_id)
1532                 return;
1533
1534         bc_local = cpu_to_be32(ne->host->csr.broadcast_channel);
1535
1536         /* Check if the register is implemented and 1394a compliant. */
1537         error = hpsb_read(ne->host, ne->nodeid, generation, bc_addr, &bc_remote,
1538                           sizeof(bc_remote));
1539         if (!error && bc_remote & cpu_to_be32(0x80000000) &&
1540             bc_remote != bc_local)
1541                 hpsb_node_write(ne, bc_addr, &bc_local, sizeof(bc_local));
1542 }
1543
1544
1545 static void nodemgr_probe_ne(struct host_info *hi, struct node_entry *ne, int generation)
1546 {
1547         struct device *dev;
1548
1549         if (ne->host != hi->host || ne->in_limbo)
1550                 return;
1551
1552         dev = get_device(&ne->device);
1553         if (!dev)
1554                 return;
1555
1556         nodemgr_irm_write_bc(ne, generation);
1557
1558         /* If "needs_probe", then this is either a new or changed node we
1559          * rescan totally. If the generation matches for an existing node
1560          * (one that existed prior to the bus reset) we send update calls
1561          * down to the drivers. Otherwise, this is a dead node and we
1562          * suspend it. */
1563         if (ne->needs_probe)
1564                 nodemgr_process_root_directory(hi, ne);
1565         else if (ne->generation == generation)
1566                 nodemgr_update_pdrv(ne);
1567         else
1568                 nodemgr_suspend_ne(ne);
1569
1570         put_device(dev);
1571 }
1572
1573
1574 static void nodemgr_node_probe(struct host_info *hi, int generation)
1575 {
1576         struct hpsb_host *host = hi->host;
1577         struct class_device *cdev;
1578         struct node_entry *ne;
1579
1580         /* Do some processing of the nodes we've probed. This pulls them
1581          * into the sysfs layer if needed, and can result in processing of
1582          * unit-directories, or just updating the node and it's
1583          * unit-directories.
1584          *
1585          * Run updates before probes. Usually, updates are time-critical
1586          * while probes are time-consuming. (Well, those probes need some
1587          * improvement...) */
1588
1589         down(&nodemgr_ne_class.sem);
1590         list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
1591                 ne = container_of(cdev, struct node_entry, class_dev);
1592                 if (!ne->needs_probe)
1593                         nodemgr_probe_ne(hi, ne, generation);
1594         }
1595         list_for_each_entry(cdev, &nodemgr_ne_class.children, node) {
1596                 ne = container_of(cdev, struct node_entry, class_dev);
1597                 if (ne->needs_probe)
1598                         nodemgr_probe_ne(hi, ne, generation);
1599         }
1600         up(&nodemgr_ne_class.sem);
1601
1602
1603         /* If we had a bus reset while we were scanning the bus, it is
1604          * possible that we did not probe all nodes.  In that case, we
1605          * skip the clean up for now, since we could remove nodes that
1606          * were still on the bus.  Another bus scan is pending which will
1607          * do the clean up eventually.
1608          *
1609          * Now let's tell the bus to rescan our devices. This may seem
1610          * like overhead, but the driver-model core will only scan a
1611          * device for a driver when either the device is added, or when a
1612          * new driver is added. A bus reset is a good reason to rescan
1613          * devices that were there before.  For example, an sbp2 device
1614          * may become available for login, if the host that held it was
1615          * just removed.  */
1616
1617         if (generation == get_hpsb_generation(host))
1618                 if (bus_rescan_devices(&ieee1394_bus_type))
1619                         HPSB_DEBUG("bus_rescan_devices had an error");
1620 }
1621
1622 static int nodemgr_send_resume_packet(struct hpsb_host *host)
1623 {
1624         struct hpsb_packet *packet;
1625         int error = -ENOMEM;
1626
1627         packet = hpsb_make_phypacket(host,
1628                         EXTPHYPACKET_TYPE_RESUME |
1629                         NODEID_TO_NODE(host->node_id) << PHYPACKET_PORT_SHIFT);
1630         if (packet) {
1631                 packet->no_waiter = 1;
1632                 packet->generation = get_hpsb_generation(host);
1633                 error = hpsb_send_packet(packet);
1634         }
1635         if (error)
1636                 HPSB_WARN("fw-host%d: Failed to broadcast resume packet",
1637                           host->id);
1638         return error;
1639 }
1640
1641 /* Perform a few high-level IRM responsibilities. */
1642 static int nodemgr_do_irm_duties(struct hpsb_host *host, int cycles)
1643 {
1644         quadlet_t bc;
1645
1646         /* if irm_id == -1 then there is no IRM on this bus */
1647         if (!host->is_irm || host->irm_id == (nodeid_t)-1)
1648                 return 1;
1649
1650         /* We are a 1394a-2000 compliant IRM. Set the validity bit. */
1651         host->csr.broadcast_channel |= 0x40000000;
1652
1653         /* If there is no bus manager then we should set the root node's
1654          * force_root bit to promote bus stability per the 1394
1655          * spec. (8.4.2.6) */
1656         if (host->busmgr_id == 0xffff && host->node_count > 1)
1657         {
1658                 u16 root_node = host->node_count - 1;
1659
1660                 /* get cycle master capability flag from root node */
1661                 if (host->is_cycmst ||
1662                     (!hpsb_read(host, LOCAL_BUS | root_node, get_hpsb_generation(host),
1663                                 (CSR_REGISTER_BASE + CSR_CONFIG_ROM + 2 * sizeof(quadlet_t)),
1664                                 &bc, sizeof(quadlet_t)) &&
1665                      be32_to_cpu(bc) & 1 << CSR_CMC_SHIFT))
1666                         hpsb_send_phy_config(host, root_node, -1);
1667                 else {
1668                         HPSB_DEBUG("The root node is not cycle master capable; "
1669                                    "selecting a new root node and resetting...");
1670
1671                         if (cycles >= 5) {
1672                                 /* Oh screw it! Just leave the bus as it is */
1673                                 HPSB_DEBUG("Stopping reset loop for IRM sanity");
1674                                 return 1;
1675                         }
1676
1677                         hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1678                         hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1679
1680                         return 0;
1681                 }
1682         }
1683
1684         /* Some devices suspend their ports while being connected to an inactive
1685          * host adapter, i.e. if connected before the low-level driver is
1686          * loaded.  They become visible either when physically unplugged and
1687          * replugged, or when receiving a resume packet.  Send one once. */
1688         if (!host->resume_packet_sent && !nodemgr_send_resume_packet(host))
1689                 host->resume_packet_sent = 1;
1690
1691         return 1;
1692 }
1693
1694 /* We need to ensure that if we are not the IRM, that the IRM node is capable of
1695  * everything we can do, otherwise issue a bus reset and try to become the IRM
1696  * ourselves. */
1697 static int nodemgr_check_irm_capability(struct hpsb_host *host, int cycles)
1698 {
1699         quadlet_t bc;
1700         int status;
1701
1702         if (hpsb_disable_irm || host->is_irm)
1703                 return 1;
1704
1705         status = hpsb_read(host, LOCAL_BUS | (host->irm_id),
1706                            get_hpsb_generation(host),
1707                            (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL),
1708                            &bc, sizeof(quadlet_t));
1709
1710         if (status < 0 || !(be32_to_cpu(bc) & 0x80000000)) {
1711                 /* The current irm node does not have a valid BROADCAST_CHANNEL
1712                  * register and we do, so reset the bus with force_root set */
1713                 HPSB_DEBUG("Current remote IRM is not 1394a-2000 compliant, resetting...");
1714
1715                 if (cycles >= 5) {
1716                         /* Oh screw it! Just leave the bus as it is */
1717                         HPSB_DEBUG("Stopping reset loop for IRM sanity");
1718                         return 1;
1719                 }
1720
1721                 hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1722                 hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1723
1724                 return 0;
1725         }
1726
1727         return 1;
1728 }
1729
1730 static int nodemgr_host_thread(void *__hi)
1731 {
1732         struct host_info *hi = (struct host_info *)__hi;
1733         struct hpsb_host *host = hi->host;
1734         unsigned int g, generation = 0;
1735         int i, reset_cycles = 0;
1736
1737         /* Setup our device-model entries */
1738         nodemgr_create_host_dev_files(host);
1739
1740         for (;;) {
1741                 /* Sleep until next bus reset */
1742                 set_current_state(TASK_INTERRUPTIBLE);
1743                 if (get_hpsb_generation(host) == generation)
1744                         schedule();
1745                 __set_current_state(TASK_RUNNING);
1746
1747                 /* Thread may have been woken up to freeze or to exit */
1748                 if (try_to_freeze())
1749                         continue;
1750                 if (kthread_should_stop())
1751                         goto exit;
1752
1753                 if (mutex_lock_interruptible(&nodemgr_serialize)) {
1754                         if (try_to_freeze())
1755                                 continue;
1756                         goto exit;
1757                 }
1758
1759                 /* Pause for 1/4 second in 1/16 second intervals,
1760                  * to make sure things settle down. */
1761                 g = get_hpsb_generation(host);
1762                 for (i = 0; i < 4 ; i++) {
1763                         if (msleep_interruptible(63) || kthread_should_stop())
1764                                 goto unlock_exit;
1765
1766                         /* Now get the generation in which the node ID's we collect
1767                          * are valid.  During the bus scan we will use this generation
1768                          * for the read transactions, so that if another reset occurs
1769                          * during the scan the transactions will fail instead of
1770                          * returning bogus data. */
1771                         generation = get_hpsb_generation(host);
1772
1773                         /* If we get a reset before we are done waiting, then
1774                          * start the the waiting over again */
1775                         if (generation != g)
1776                                 g = generation, i = 0;
1777                 }
1778
1779                 if (!nodemgr_check_irm_capability(host, reset_cycles) ||
1780                     !nodemgr_do_irm_duties(host, reset_cycles)) {
1781                         reset_cycles++;
1782                         mutex_unlock(&nodemgr_serialize);
1783                         continue;
1784                 }
1785                 reset_cycles = 0;
1786
1787                 /* Scan our nodes to get the bus options and create node
1788                  * entries. This does not do the sysfs stuff, since that
1789                  * would trigger uevents and such, which is a bad idea at
1790                  * this point. */
1791                 nodemgr_node_scan(hi, generation);
1792
1793                 /* This actually does the full probe, with sysfs
1794                  * registration. */
1795                 nodemgr_node_probe(hi, generation);
1796
1797                 /* Update some of our sysfs symlinks */
1798                 nodemgr_update_host_dev_links(host);
1799
1800                 mutex_unlock(&nodemgr_serialize);
1801         }
1802 unlock_exit:
1803         mutex_unlock(&nodemgr_serialize);
1804 exit:
1805         HPSB_VERBOSE("NodeMgr: Exiting thread");
1806         return 0;
1807 }
1808
1809 int nodemgr_for_each_host(void *__data, int (*cb)(struct hpsb_host *, void *))
1810 {
1811         struct class_device *cdev;
1812         struct hpsb_host *host;
1813         int error = 0;
1814
1815         down(&hpsb_host_class.sem);
1816         list_for_each_entry(cdev, &hpsb_host_class.children, node) {
1817                 host = container_of(cdev, struct hpsb_host, class_dev);
1818
1819                 if ((error = cb(host, __data)))
1820                         break;
1821         }
1822         up(&hpsb_host_class.sem);
1823
1824         return error;
1825 }
1826
1827 /* The following four convenience functions use a struct node_entry
1828  * for addressing a node on the bus.  They are intended for use by any
1829  * process context, not just the nodemgr thread, so we need to be a
1830  * little careful when reading out the node ID and generation.  The
1831  * thing that can go wrong is that we get the node ID, then a bus
1832  * reset occurs, and then we read the generation.  The node ID is
1833  * possibly invalid, but the generation is current, and we end up
1834  * sending a packet to a the wrong node.
1835  *
1836  * The solution is to make sure we read the generation first, so that
1837  * if a reset occurs in the process, we end up with a stale generation
1838  * and the transactions will fail instead of silently using wrong node
1839  * ID's.
1840  */
1841
1842 void hpsb_node_fill_packet(struct node_entry *ne, struct hpsb_packet *pkt)
1843 {
1844         pkt->host = ne->host;
1845         pkt->generation = ne->generation;
1846         barrier();
1847         pkt->node_id = ne->nodeid;
1848 }
1849
1850 int hpsb_node_write(struct node_entry *ne, u64 addr,
1851                     quadlet_t *buffer, size_t length)
1852 {
1853         unsigned int generation = ne->generation;
1854
1855         barrier();
1856         return hpsb_write(ne->host, ne->nodeid, generation,
1857                           addr, buffer, length);
1858 }
1859
1860 static void nodemgr_add_host(struct hpsb_host *host)
1861 {
1862         struct host_info *hi;
1863
1864         hi = hpsb_create_hostinfo(&nodemgr_highlevel, host, sizeof(*hi));
1865         if (!hi) {
1866                 HPSB_ERR("NodeMgr: out of memory in add host");
1867                 return;
1868         }
1869         hi->host = host;
1870         hi->thread = kthread_run(nodemgr_host_thread, hi, "knodemgrd_%d",
1871                                  host->id);
1872         if (IS_ERR(hi->thread)) {
1873                 HPSB_ERR("NodeMgr: cannot start thread for host %d", host->id);
1874                 hpsb_destroy_hostinfo(&nodemgr_highlevel, host);
1875         }
1876 }
1877
1878 static void nodemgr_host_reset(struct hpsb_host *host)
1879 {
1880         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1881
1882         if (hi) {
1883                 HPSB_VERBOSE("NodeMgr: Processing reset for host %d", host->id);
1884                 wake_up_process(hi->thread);
1885         }
1886 }
1887
1888 static void nodemgr_remove_host(struct hpsb_host *host)
1889 {
1890         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1891
1892         if (hi) {
1893                 kthread_stop(hi->thread);
1894                 nodemgr_remove_host_dev(&host->device);
1895         }
1896 }
1897
1898 static struct hpsb_highlevel nodemgr_highlevel = {
1899         .name =         "Node manager",
1900         .add_host =     nodemgr_add_host,
1901         .host_reset =   nodemgr_host_reset,
1902         .remove_host =  nodemgr_remove_host,
1903 };
1904
1905 int init_ieee1394_nodemgr(void)
1906 {
1907         int error;
1908
1909         error = class_register(&nodemgr_ne_class);
1910         if (error)
1911                 return error;
1912
1913         error = class_register(&nodemgr_ud_class);
1914         if (error) {
1915                 class_unregister(&nodemgr_ne_class);
1916                 return error;
1917         }
1918         error = driver_register(&nodemgr_mid_layer_driver);
1919         hpsb_register_highlevel(&nodemgr_highlevel);
1920         return 0;
1921 }
1922
1923 void cleanup_ieee1394_nodemgr(void)
1924 {
1925         hpsb_unregister_highlevel(&nodemgr_highlevel);
1926
1927         class_unregister(&nodemgr_ud_class);
1928         class_unregister(&nodemgr_ne_class);
1929 }