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 #include <asm/semaphore.h>
  23
  24 #include "csr.h"
  25 #include "highlevel.h"
  26 #include "hosts.h"
  27 #include "ieee1394.h"
  28 #include "ieee1394_core.h"
  29 #include "ieee1394_hotplug.h"
  30 #include "ieee1394_types.h"
  31 #include "ieee1394_transactions.h"
  32 #include "nodemgr.h"
  33
  34 static int ignore_drivers;
  35 module_param(ignore_drivers, int, S_IRUGO | S_IWUSR);
  36 MODULE_PARM_DESC(ignore_drivers, "Disable automatic probing for drivers.");
  37
  38 struct nodemgr_csr_info {
  39         struct hpsb_host *host;
  40         nodeid_t nodeid;
  41         unsigned int generation;
  42         unsigned int speed_unverified:1;
  43 };
  44
  45
  46 /*
  47  * Correct the speed map entry.  This is necessary
  48  *  - for nodes with link speed < phy speed,
  49  *  - for 1394b nodes with negotiated phy port speed < IEEE1394_SPEED_MAX.
  50  * A possible speed is determined by trial and error, using quadlet reads.
  51  */
  52 static int nodemgr_check_speed(struct nodemgr_csr_info *ci, u64 addr,
  53                                quadlet_t *buffer)
  54 {
  55         quadlet_t q;
  56         u8 i, *speed, old_speed, good_speed;
  57         int error;
  58
  59         speed = &(ci->host->speed[NODEID_TO_NODE(ci->nodeid)]);
  60         old_speed = *speed;
  61         good_speed = IEEE1394_SPEED_MAX + 1;
  62
  63         /* Try every speed from S100 to old_speed.
  64          * If we did it the other way around, a too low speed could be caught
  65          * if the retry succeeded for some other reason, e.g. because the link
  66          * just finished its initialization. */
  67         for (i = IEEE1394_SPEED_100; i <= old_speed; i++) {
  68                 *speed = i;
  69                 error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
  70                                   &q, sizeof(quadlet_t));
  71                 if (error)
  72                         break;
  73                 *buffer = q;
  74                 good_speed = i;
  75         }
  76         if (good_speed <= IEEE1394_SPEED_MAX) {
  77                 HPSB_DEBUG("Speed probe of node " NODE_BUS_FMT " yields %s",
  78                            NODE_BUS_ARGS(ci->host, ci->nodeid),
  79                            hpsb_speedto_str[good_speed]);
  80                 *speed = good_speed;
  81                 ci->speed_unverified = 0;
  82                 return 0;
  83         }
  84         *speed = old_speed;
  85         return error;
  86 }
  87
  88 static int nodemgr_bus_read(struct csr1212_csr *csr, u64 addr, u16 length,
  89                             void *buffer, void *__ci)
  90 {
  91         struct nodemgr_csr_info *ci = (struct nodemgr_csr_info*)__ci;
  92         int i, error;
  93
  94         for (i = 1; ; i++) {
  95                 error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
  96                                   buffer, length);
  97                 if (!error) {
  98                         ci->speed_unverified = 0;
  99                         break;
 100                 }
 101                 /* Give up after 3rd failure. */
 102                 if (i == 3)
 103                         break;
 104
 105                 /* The ieee1394_core guessed the node's speed capability from
 106                  * the self ID.  Check whether a lower speed works. */
 107                 if (ci->speed_unverified && length == sizeof(quadlet_t)) {
 108                         error = nodemgr_check_speed(ci, addr, buffer);
 109                         if (!error)
 110                                 break;
 111                 }
 112                 if (msleep_interruptible(334))
 113                         return -EINTR;
 114         }
 115         return error;
 116 }
 117
 118 static int nodemgr_get_max_rom(quadlet_t *bus_info_data, void *__ci)
 119 {
 120         return (be32_to_cpu(bus_info_data[2]) >> 8) & 0x3;
 121 }
 122
 123 static struct csr1212_bus_ops nodemgr_csr_ops = {
 124         .bus_read =     nodemgr_bus_read,
 125         .get_max_rom =  nodemgr_get_max_rom
 126 };
 127
 128
 129 /*
 130  * Basically what we do here is start off retrieving the bus_info block.
 131  * From there will fill in some info about the node, verify it is of IEEE
 132  * 1394 type, and that the crc checks out ok. After that we start off with
 133  * the root directory, and subdirectories. To do this, we retrieve the
 134  * quadlet header for a directory, find out the length, and retrieve the
 135  * complete directory entry (be it a leaf or a directory). We then process
 136  * it and add the info to our structure for that particular node.
 137  *
 138  * We verify CRC's along the way for each directory/block/leaf. The entire
 139  * node structure is generic, and simply stores the information in a way
 140  * that's easy to parse by the protocol interface.
 141  */
 142
 143 /*
 144  * The nodemgr relies heavily on the Driver Model for device callbacks and
 145  * driver/device mappings. The old nodemgr used to handle all this itself,
 146  * but now we are much simpler because of the LDM.
 147  */
 148
 149 struct host_info {
 150         struct hpsb_host *host;
 151         struct list_head list;
 152         struct task_struct *thread;
 153 };
 154
 155 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv);
 156 static int nodemgr_uevent(struct device *dev, char **envp, int num_envp,
 157                           char *buffer, int buffer_size);
 158 static void nodemgr_resume_ne(struct node_entry *ne);
 159 static void nodemgr_remove_ne(struct node_entry *ne);
 160 static struct node_entry *find_entry_by_guid(u64 guid);
 161
 162 struct bus_type ieee1394_bus_type = {
 163         .name           = "ieee1394",
 164         .match          = nodemgr_bus_match,
 165 };
 166
 167 static void host_cls_release(struct device *dev)
 168 {
 169         put_device(&container_of((dev), struct hpsb_host, host_dev)->device);
 170 }
 171
 172 struct class hpsb_host_class = {
 173         .name           = "ieee1394_host",
 174         .dev_release    = host_cls_release,
 175 };
 176
 177 static void ne_cls_release(struct device *dev)
 178 {
 179         put_device(&container_of((dev), struct node_entry, node_dev)->device);
 180 }
 181
 182 static struct class nodemgr_ne_class = {
 183         .name           = "ieee1394_node",
 184         .dev_release    = ne_cls_release,
 185 };
 186
 187 static void ud_cls_release(struct device *dev)
 188 {
 189         put_device(&container_of((dev), struct unit_directory, unit_dev)->device);
 190 }
 191
 192 /* The name here is only so that unit directory hotplug works with old
 193  * style hotplug, which only ever did unit directories anyway.
 194  */
 195 static struct class nodemgr_ud_class = {
 196         .name           = "ieee1394",
 197         .dev_release    = ud_cls_release,
 198         .dev_uevent     = nodemgr_uevent,
 199 };
 200
 201 static struct hpsb_highlevel nodemgr_highlevel;
 202
 203
 204 static void nodemgr_release_ud(struct device *dev)
 205 {
 206         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 207
 208         if (ud->vendor_name_kv)
 209                 csr1212_release_keyval(ud->vendor_name_kv);
 210         if (ud->model_name_kv)
 211                 csr1212_release_keyval(ud->model_name_kv);
 212
 213         kfree(ud);
 214 }
 215
 216 static void nodemgr_release_ne(struct device *dev)
 217 {
 218         struct node_entry *ne = container_of(dev, struct node_entry, device);
 219
 220         if (ne->vendor_name_kv)
 221                 csr1212_release_keyval(ne->vendor_name_kv);
 222
 223         kfree(ne);
 224 }
 225
 226
 227 static void nodemgr_release_host(struct device *dev)
 228 {
 229         struct hpsb_host *host = container_of(dev, struct hpsb_host, device);
 230
 231         csr1212_destroy_csr(host->csr.rom);
 232
 233         kfree(host);
 234 }
 235
 236 static int nodemgr_ud_platform_data;
 237
 238 static struct device nodemgr_dev_template_ud = {
 239         .bus            = &ieee1394_bus_type,
 240         .release        = nodemgr_release_ud,
 241         .platform_data  = &nodemgr_ud_platform_data,
 242 };
 243
 244 static struct device nodemgr_dev_template_ne = {
 245         .bus            = &ieee1394_bus_type,
 246         .release        = nodemgr_release_ne,
 247 };
 248
 249 /* This dummy driver prevents the host devices from being scanned. We have no
 250  * useful drivers for them yet, and there would be a deadlock possible if the
 251  * driver core scans the host device while the host's low-level driver (i.e.
 252  * the host's parent device) is being removed. */
 253 static struct device_driver nodemgr_mid_layer_driver = {
 254         .bus            = &ieee1394_bus_type,
 255         .name           = "nodemgr",
 256         .owner          = THIS_MODULE,
 257 };
 258
 259 struct device nodemgr_dev_template_host = {
 260         .bus            = &ieee1394_bus_type,
 261         .release        = nodemgr_release_host,
 262 };
 263
 264
 265 #define fw_attr(class, class_type, field, type, format_string)          \
 266 static ssize_t fw_show_##class##_##field (struct device *dev, struct device_attribute *attr, char *buf)\
 267 {                                                                       \
 268         class_type *class;                                              \
 269         class = container_of(dev, class_type, device);                  \
 270         return sprintf(buf, format_string, (type)class->field);         \
 271 }                                                                       \
 272 static struct device_attribute dev_attr_##class##_##field = {           \
 273         .attr = {.name = __stringify(field), .mode = S_IRUGO },         \
 274         .show   = fw_show_##class##_##field,                            \
 275 };
 276
 277 #define fw_attr_td(class, class_type, td_kv)                            \
 278 static ssize_t fw_show_##class##_##td_kv (struct device *dev, struct device_attribute *attr, char *buf)\
 279 {                                                                       \
 280         int len;                                                        \
 281         class_type *class = container_of(dev, class_type, device);      \
 282         len = (class->td_kv->value.leaf.len - 2) * sizeof(quadlet_t);   \
 283         memcpy(buf,                                                     \
 284                CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(class->td_kv),      \
 285                len);                                                    \
 286         while (buf[len - 1] == '\0')                                    \
 287                 len--;                                                  \
 288         buf[len++] = '\n';                                              \
 289         buf[len] = '\0';                                                \
 290         return len;                                                     \
 291 }                                                                       \
 292 static struct device_attribute dev_attr_##class##_##td_kv = {           \
 293         .attr = {.name = __stringify(td_kv), .mode = S_IRUGO },         \
 294         .show   = fw_show_##class##_##td_kv,                            \
 295 };
 296
 297
 298 #define fw_drv_attr(field, type, format_string)                 \
 299 static ssize_t fw_drv_show_##field (struct device_driver *drv, char *buf) \
 300 {                                                               \
 301         struct hpsb_protocol_driver *driver;                    \
 302         driver = container_of(drv, struct hpsb_protocol_driver, driver); \
 303         return sprintf(buf, format_string, (type)driver->field);\
 304 }                                                               \
 305 static struct driver_attribute driver_attr_drv_##field = {      \
 306         .attr = {.name = __stringify(field), .mode = S_IRUGO }, \
 307         .show   = fw_drv_show_##field,                          \
 308 };
 309
 310
 311 static ssize_t fw_show_ne_bus_options(struct device *dev, struct device_attribute *attr, char *buf)
 312 {
 313         struct node_entry *ne = container_of(dev, struct node_entry, device);
 314
 315         return sprintf(buf, "IRMC(%d) CMC(%d) ISC(%d) BMC(%d) PMC(%d) GEN(%d) "
 316                        "LSPD(%d) MAX_REC(%d) MAX_ROM(%d) CYC_CLK_ACC(%d)\n",
 317                        ne->busopt.irmc,
 318                        ne->busopt.cmc, ne->busopt.isc, ne->busopt.bmc,
 319                        ne->busopt.pmc, ne->busopt.generation, ne->busopt.lnkspd,
 320                        ne->busopt.max_rec,
 321                        ne->busopt.max_rom,
 322                        ne->busopt.cyc_clk_acc);
 323 }
 324 static DEVICE_ATTR(bus_options,S_IRUGO,fw_show_ne_bus_options,NULL);
 325
 326
 327 #ifdef HPSB_DEBUG_TLABELS
 328 static ssize_t fw_show_ne_tlabels_free(struct device *dev,
 329                                        struct device_attribute *attr, char *buf)
 330 {
 331         struct node_entry *ne = container_of(dev, struct node_entry, device);
 332         unsigned long flags;
 333         unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
 334         int tf;
 335
 336         spin_lock_irqsave(&hpsb_tlabel_lock, flags);
 337         tf = 64 - bitmap_weight(tp, 64);
 338         spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
 339
 340         return sprintf(buf, "%d\n", tf);
 341 }
 342 static DEVICE_ATTR(tlabels_free,S_IRUGO,fw_show_ne_tlabels_free,NULL);
 343
 344
 345 static ssize_t fw_show_ne_tlabels_mask(struct device *dev,
 346                                        struct device_attribute *attr, char *buf)
 347 {
 348         struct node_entry *ne = container_of(dev, struct node_entry, device);
 349         unsigned long flags;
 350         unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
 351         u64 tm;
 352
 353         spin_lock_irqsave(&hpsb_tlabel_lock, flags);
 354 #if (BITS_PER_LONG <= 32)
 355         tm = ((u64)tp[0] << 32) + tp[1];
 356 #else
 357         tm = tp[0];
 358 #endif
 359         spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
 360
 361         return sprintf(buf, "0x%016llx\n", (unsigned long long)tm);
 362 }
 363 static DEVICE_ATTR(tlabels_mask, S_IRUGO, fw_show_ne_tlabels_mask, NULL);
 364 #endif /* HPSB_DEBUG_TLABELS */
 365
 366
 367 static ssize_t fw_set_ignore_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 368 {
 369         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 370         int state = simple_strtoul(buf, NULL, 10);
 371
 372         if (state == 1) {
 373                 ud->ignore_driver = 1;
 374                 device_release_driver(dev);
 375         } else if (state == 0)
 376                 ud->ignore_driver = 0;
 377
 378         return count;
 379 }
 380 static ssize_t fw_get_ignore_driver(struct device *dev, struct device_attribute *attr, char *buf)
 381 {
 382         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 383
 384         return sprintf(buf, "%d\n", ud->ignore_driver);
 385 }
 386 static DEVICE_ATTR(ignore_driver, S_IWUSR | S_IRUGO, fw_get_ignore_driver, fw_set_ignore_driver);
 387
 388
 389 static ssize_t fw_set_destroy_node(struct bus_type *bus, const char *buf, size_t count)
 390 {
 391         struct node_entry *ne;
 392         u64 guid = (u64)simple_strtoull(buf, NULL, 16);
 393
 394         ne = find_entry_by_guid(guid);
 395
 396         if (ne == NULL || !ne->in_limbo)
 397                 return -EINVAL;
 398
 399         nodemgr_remove_ne(ne);
 400
 401         return count;
 402 }
 403 static ssize_t fw_get_destroy_node(struct bus_type *bus, char *buf)
 404 {
 405         return sprintf(buf, "You can destroy in_limbo nodes by writing their GUID to this file\n");
 406 }
 407 static BUS_ATTR(destroy_node, S_IWUSR | S_IRUGO, fw_get_destroy_node, fw_set_destroy_node);
 408
 409
 410 static ssize_t fw_set_rescan(struct bus_type *bus, const char *buf,
 411                              size_t count)
 412 {
 413         int error = 0;
 414
 415         if (simple_strtoul(buf, NULL, 10) == 1)
 416                 error = bus_rescan_devices(&ieee1394_bus_type);
 417         return error ? error : count;
 418 }
 419 static ssize_t fw_get_rescan(struct bus_type *bus, char *buf)
 420 {
 421         return sprintf(buf, "You can force a rescan of the bus for "
 422                         "drivers by writing a 1 to this file\n");
 423 }
 424 static BUS_ATTR(rescan, S_IWUSR | S_IRUGO, fw_get_rescan, fw_set_rescan);
 425
 426
 427 static ssize_t fw_set_ignore_drivers(struct bus_type *bus, const char *buf, size_t count)
 428 {
 429         int state = simple_strtoul(buf, NULL, 10);
 430
 431         if (state == 1)
 432                 ignore_drivers = 1;
 433         else if (state == 0)
 434                 ignore_drivers = 0;
 435
 436         return count;
 437 }
 438 static ssize_t fw_get_ignore_drivers(struct bus_type *bus, char *buf)
 439 {
 440         return sprintf(buf, "%d\n", ignore_drivers);
 441 }
 442 static BUS_ATTR(ignore_drivers, S_IWUSR | S_IRUGO, fw_get_ignore_drivers, fw_set_ignore_drivers);
 443
 444
 445 struct bus_attribute *const fw_bus_attrs[] = {
 446         &bus_attr_destroy_node,
 447         &bus_attr_rescan,
 448         &bus_attr_ignore_drivers,
 449         NULL
 450 };
 451
 452
 453 fw_attr(ne, struct node_entry, capabilities, unsigned int, "0x%06x\n")
 454 fw_attr(ne, struct node_entry, nodeid, unsigned int, "0x%04x\n")
 455
 456 fw_attr(ne, struct node_entry, vendor_id, unsigned int, "0x%06x\n")
 457 fw_attr_td(ne, struct node_entry, vendor_name_kv)
 458
 459 fw_attr(ne, struct node_entry, guid, unsigned long long, "0x%016Lx\n")
 460 fw_attr(ne, struct node_entry, guid_vendor_id, unsigned int, "0x%06x\n")
 461 fw_attr(ne, struct node_entry, in_limbo, int, "%d\n");
 462
 463 static struct device_attribute *const fw_ne_attrs[] = {
 464         &dev_attr_ne_guid,
 465         &dev_attr_ne_guid_vendor_id,
 466         &dev_attr_ne_capabilities,
 467         &dev_attr_ne_vendor_id,
 468         &dev_attr_ne_nodeid,
 469         &dev_attr_bus_options,
 470 #ifdef HPSB_DEBUG_TLABELS
 471         &dev_attr_tlabels_free,
 472         &dev_attr_tlabels_mask,
 473 #endif
 474 };
 475
 476
 477
 478 fw_attr(ud, struct unit_directory, address, unsigned long long, "0x%016Lx\n")
 479 fw_attr(ud, struct unit_directory, length, int, "%d\n")
 480 /* These are all dependent on the value being provided */
 481 fw_attr(ud, struct unit_directory, vendor_id, unsigned int, "0x%06x\n")
 482 fw_attr(ud, struct unit_directory, model_id, unsigned int, "0x%06x\n")
 483 fw_attr(ud, struct unit_directory, specifier_id, unsigned int, "0x%06x\n")
 484 fw_attr(ud, struct unit_directory, version, unsigned int, "0x%06x\n")
 485 fw_attr_td(ud, struct unit_directory, vendor_name_kv)
 486 fw_attr_td(ud, struct unit_directory, model_name_kv)
 487
 488 static struct device_attribute *const fw_ud_attrs[] = {
 489         &dev_attr_ud_address,
 490         &dev_attr_ud_length,
 491         &dev_attr_ignore_driver,
 492 };
 493
 494
 495 fw_attr(host, struct hpsb_host, node_count, int, "%d\n")
 496 fw_attr(host, struct hpsb_host, selfid_count, int, "%d\n")
 497 fw_attr(host, struct hpsb_host, nodes_active, int, "%d\n")
 498 fw_attr(host, struct hpsb_host, in_bus_reset, int, "%d\n")
 499 fw_attr(host, struct hpsb_host, is_root, int, "%d\n")
 500 fw_attr(host, struct hpsb_host, is_cycmst, int, "%d\n")
 501 fw_attr(host, struct hpsb_host, is_irm, int, "%d\n")
 502 fw_attr(host, struct hpsb_host, is_busmgr, int, "%d\n")
 503
 504 static struct device_attribute *const fw_host_attrs[] = {
 505         &dev_attr_host_node_count,
 506         &dev_attr_host_selfid_count,
 507         &dev_attr_host_nodes_active,
 508         &dev_attr_host_in_bus_reset,
 509         &dev_attr_host_is_root,
 510         &dev_attr_host_is_cycmst,
 511         &dev_attr_host_is_irm,
 512         &dev_attr_host_is_busmgr,
 513 };
 514
 515
 516 static ssize_t fw_show_drv_device_ids(struct device_driver *drv, char *buf)
 517 {
 518         struct hpsb_protocol_driver *driver;
 519         struct ieee1394_device_id *id;
 520         int length = 0;
 521         char *scratch = buf;
 522
 523         driver = container_of(drv, struct hpsb_protocol_driver, driver);
 524
 525         for (id = driver->id_table; id->match_flags != 0; id++) {
 526                 int need_coma = 0;
 527
 528                 if (id->match_flags & IEEE1394_MATCH_VENDOR_ID) {
 529                         length += sprintf(scratch, "vendor_id=0x%06x", id->vendor_id);
 530                         scratch = buf + length;
 531                         need_coma++;
 532                 }
 533
 534                 if (id->match_flags & IEEE1394_MATCH_MODEL_ID) {
 535                         length += sprintf(scratch, "%smodel_id=0x%06x",
 536                                           need_coma++ ? "," : "",
 537                                           id->model_id);
 538                         scratch = buf + length;
 539                 }
 540
 541                 if (id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) {
 542                         length += sprintf(scratch, "%sspecifier_id=0x%06x",
 543                                           need_coma++ ? "," : "",
 544                                           id->specifier_id);
 545                         scratch = buf + length;
 546                 }
 547
 548                 if (id->match_flags & IEEE1394_MATCH_VERSION) {
 549                         length += sprintf(scratch, "%sversion=0x%06x",
 550                                           need_coma++ ? "," : "",
 551                                           id->version);
 552                         scratch = buf + length;
 553                 }
 554
 555                 if (need_coma) {
 556                         *scratch++ = '\n';
 557                         length++;
 558                 }
 559         }
 560
 561         return length;
 562 }
 563 static DRIVER_ATTR(device_ids,S_IRUGO,fw_show_drv_device_ids,NULL);
 564
 565
 566 fw_drv_attr(name, const char *, "%s\n")
 567
 568 static struct driver_attribute *const fw_drv_attrs[] = {
 569         &driver_attr_drv_name,
 570         &driver_attr_device_ids,
 571 };
 572
 573
 574 static void nodemgr_create_drv_files(struct hpsb_protocol_driver *driver)
 575 {
 576         struct device_driver *drv = &driver->driver;
 577         int i;
 578
 579         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
 580                 if (driver_create_file(drv, fw_drv_attrs[i]))
 581                         goto fail;
 582         return;
 583 fail:
 584         HPSB_ERR("Failed to add sysfs attribute");
 585 }
 586
 587
 588 static void nodemgr_remove_drv_files(struct hpsb_protocol_driver *driver)
 589 {
 590         struct device_driver *drv = &driver->driver;
 591         int i;
 592
 593         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
 594                 driver_remove_file(drv, fw_drv_attrs[i]);
 595 }
 596
 597
 598 static void nodemgr_create_ne_dev_files(struct node_entry *ne)
 599 {
 600         struct device *dev = &ne->device;
 601         int i;
 602
 603         for (i = 0; i < ARRAY_SIZE(fw_ne_attrs); i++)
 604                 if (device_create_file(dev, fw_ne_attrs[i]))
 605                         goto fail;
 606         return;
 607 fail:
 608         HPSB_ERR("Failed to add sysfs attribute");
 609 }
 610
 611
 612 static void nodemgr_create_host_dev_files(struct hpsb_host *host)
 613 {
 614         struct device *dev = &host->device;
 615         int i;
 616
 617         for (i = 0; i < ARRAY_SIZE(fw_host_attrs); i++)
 618                 if (device_create_file(dev, fw_host_attrs[i]))
 619                         goto fail;
 620         return;
 621 fail:
 622         HPSB_ERR("Failed to add sysfs attribute");
 623 }
 624
 625
 626 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
 627                                                nodeid_t nodeid);
 628
 629 static void nodemgr_update_host_dev_links(struct hpsb_host *host)
 630 {
 631         struct device *dev = &host->device;
 632         struct node_entry *ne;
 633
 634         sysfs_remove_link(&dev->kobj, "irm_id");
 635         sysfs_remove_link(&dev->kobj, "busmgr_id");
 636         sysfs_remove_link(&dev->kobj, "host_id");
 637
 638         if ((ne = find_entry_by_nodeid(host, host->irm_id)) &&
 639             sysfs_create_link(&dev->kobj, &ne->device.kobj, "irm_id"))
 640                 goto fail;
 641         if ((ne = find_entry_by_nodeid(host, host->busmgr_id)) &&
 642             sysfs_create_link(&dev->kobj, &ne->device.kobj, "busmgr_id"))
 643                 goto fail;
 644         if ((ne = find_entry_by_nodeid(host, host->node_id)) &&
 645             sysfs_create_link(&dev->kobj, &ne->device.kobj, "host_id"))
 646                 goto fail;
 647         return;
 648 fail:
 649         HPSB_ERR("Failed to update sysfs attributes for host %d", host->id);
 650 }
 651
 652 static void nodemgr_create_ud_dev_files(struct unit_directory *ud)
 653 {
 654         struct device *dev = &ud->device;
 655         int i;
 656
 657         for (i = 0; i < ARRAY_SIZE(fw_ud_attrs); i++)
 658                 if (device_create_file(dev, fw_ud_attrs[i]))
 659                         goto fail;
 660         if (ud->flags & UNIT_DIRECTORY_SPECIFIER_ID)
 661                 if (device_create_file(dev, &dev_attr_ud_specifier_id))
 662                         goto fail;
 663         if (ud->flags & UNIT_DIRECTORY_VERSION)
 664                 if (device_create_file(dev, &dev_attr_ud_version))
 665                         goto fail;
 666         if (ud->flags & UNIT_DIRECTORY_VENDOR_ID) {
 667                 if (device_create_file(dev, &dev_attr_ud_vendor_id))
 668                         goto fail;
 669                 if (ud->vendor_name_kv &&
 670                     device_create_file(dev, &dev_attr_ud_vendor_name_kv))
 671                         goto fail;
 672         }
 673         if (ud->flags & UNIT_DIRECTORY_MODEL_ID) {
 674                 if (device_create_file(dev, &dev_attr_ud_model_id))
 675                         goto fail;
 676                 if (ud->model_name_kv &&
 677                     device_create_file(dev, &dev_attr_ud_model_name_kv))
 678                         goto fail;
 679         }
 680         return;
 681 fail:
 682         HPSB_ERR("Failed to add sysfs attribute");
 683 }
 684
 685
 686 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv)
 687 {
 688         struct hpsb_protocol_driver *driver;
 689         struct unit_directory *ud;
 690         struct ieee1394_device_id *id;
 691
 692         /* We only match unit directories */
 693         if (dev->platform_data != &nodemgr_ud_platform_data)
 694                 return 0;
 695
 696         ud = container_of(dev, struct unit_directory, device);
 697         if (ud->ne->in_limbo || ud->ignore_driver)
 698                 return 0;
 699
 700         /* We only match drivers of type hpsb_protocol_driver */
 701         if (drv == &nodemgr_mid_layer_driver)
 702                 return 0;
 703
 704         driver = container_of(drv, struct hpsb_protocol_driver, driver);
 705         for (id = driver->id_table; id->match_flags != 0; id++) {
 706                 if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) &&
 707                     id->vendor_id != ud->vendor_id)
 708                         continue;
 709
 710                 if ((id->match_flags & IEEE1394_MATCH_MODEL_ID) &&
 711                     id->model_id != ud->model_id)
 712                         continue;
 713
 714                 if ((id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) &&
 715                     id->specifier_id != ud->specifier_id)
 716                         continue;
 717
 718                 if ((id->match_flags & IEEE1394_MATCH_VERSION) &&
 719                     id->version != ud->version)
 720                         continue;
 721
 722                 return 1;
 723         }
 724
 725         return 0;
 726 }
 727
 728
 729 static DEFINE_MUTEX(nodemgr_serialize_remove_uds);
 730
 731 static void nodemgr_remove_uds(struct node_entry *ne)
 732 {
 733         struct device *dev;
 734         struct unit_directory *tmp, *ud;
 735
 736         /* Iteration over nodemgr_ud_class.devices has to be protected by
 737          * nodemgr_ud_class.sem, but device_unregister() will eventually
 738          * take nodemgr_ud_class.sem too. Therefore pick out one ud at a time,
 739          * release the semaphore, and then unregister the ud. Since this code
 740          * may be called from other contexts besides the knodemgrds, protect the
 741          * gap after release of the semaphore by nodemgr_serialize_remove_uds.
 742          */
 743         mutex_lock(&nodemgr_serialize_remove_uds);
 744         for (;;) {
 745                 ud = NULL;
 746                 down(&nodemgr_ud_class.sem);
 747                 list_for_each_entry(dev, &nodemgr_ud_class.devices, node) {
 748                         tmp = container_of(dev, struct unit_directory,
 749                                            unit_dev);
 750                         if (tmp->ne == ne) {
 751                                 ud = tmp;
 752                                 break;
 753                         }
 754                 }
 755                 up(&nodemgr_ud_class.sem);
 756                 if (ud == NULL)
 757                         break;
 758                 device_unregister(&ud->unit_dev);
 759                 device_unregister(&ud->device);
 760         }
 761         mutex_unlock(&nodemgr_serialize_remove_uds);
 762 }
 763
 764
 765 static void nodemgr_remove_ne(struct node_entry *ne)
 766 {
 767         struct device *dev;
 768
 769         dev = get_device(&ne->device);
 770         if (!dev)
 771                 return;
 772
 773         HPSB_DEBUG("Node removed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 774                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
 775         nodemgr_remove_uds(ne);
 776
 777         device_unregister(&ne->node_dev);
 778         device_unregister(dev);
 779
 780         put_device(dev);
 781 }
 782
 783 static int __nodemgr_remove_host_dev(struct device *dev, void *data)
 784 {
 785         if (dev->bus == &ieee1394_bus_type)
 786                 nodemgr_remove_ne(container_of(dev, struct node_entry,
 787                                   device));
 788         return 0;
 789 }
 790
 791 static void nodemgr_remove_host_dev(struct device *dev)
 792 {
 793         WARN_ON(device_for_each_child(dev, NULL, __nodemgr_remove_host_dev));
 794         sysfs_remove_link(&dev->kobj, "irm_id");
 795         sysfs_remove_link(&dev->kobj, "busmgr_id");
 796         sysfs_remove_link(&dev->kobj, "host_id");
 797 }
 798
 799
 800 static void nodemgr_update_bus_options(struct node_entry *ne)
 801 {
 802 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
 803         static const u16 mr[] = { 4, 64, 1024, 0};
 804 #endif
 805         quadlet_t busoptions = be32_to_cpu(ne->csr->bus_info_data[2]);
 806
 807         ne->busopt.irmc         = (busoptions >> 31) & 1;
 808         ne->busopt.cmc          = (busoptions >> 30) & 1;
 809         ne->busopt.isc          = (busoptions >> 29) & 1;
 810         ne->busopt.bmc          = (busoptions >> 28) & 1;
 811         ne->busopt.pmc          = (busoptions >> 27) & 1;
 812         ne->busopt.cyc_clk_acc  = (busoptions >> 16) & 0xff;
 813         ne->busopt.max_rec      = 1 << (((busoptions >> 12) & 0xf) + 1);
 814         ne->busopt.max_rom      = (busoptions >> 8) & 0x3;
 815         ne->busopt.generation   = (busoptions >> 4) & 0xf;
 816         ne->busopt.lnkspd       = busoptions & 0x7;
 817
 818         HPSB_VERBOSE("NodeMgr: raw=0x%08x irmc=%d cmc=%d isc=%d bmc=%d pmc=%d "
 819                      "cyc_clk_acc=%d max_rec=%d max_rom=%d gen=%d lspd=%d",
 820                      busoptions, ne->busopt.irmc, ne->busopt.cmc,
 821                      ne->busopt.isc, ne->busopt.bmc, ne->busopt.pmc,
 822                      ne->busopt.cyc_clk_acc, ne->busopt.max_rec,
 823                      mr[ne->busopt.max_rom],
 824                      ne->busopt.generation, ne->busopt.lnkspd);
 825 }
 826
 827
 828 static struct node_entry *nodemgr_create_node(octlet_t guid, struct csr1212_csr *csr,
 829                                               struct host_info *hi, nodeid_t nodeid,
 830                                               unsigned int generation)
 831 {
 832         struct hpsb_host *host = hi->host;
 833         struct node_entry *ne;
 834
 835         ne = kzalloc(sizeof(*ne), GFP_KERNEL);
 836         if (!ne)
 837                 goto fail_alloc;
 838
 839         ne->host = host;
 840         ne->nodeid = nodeid;
 841         ne->generation = generation;
 842         ne->needs_probe = 1;
 843
 844         ne->guid = guid;
 845         ne->guid_vendor_id = (guid >> 40) & 0xffffff;
 846         ne->csr = csr;
 847
 848         memcpy(&ne->device, &nodemgr_dev_template_ne,
 849                sizeof(ne->device));
 850         ne->device.parent = &host->device;
 851         snprintf(ne->device.bus_id, BUS_ID_SIZE, "%016Lx",
 852                  (unsigned long long)(ne->guid));
 853
 854         ne->node_dev.parent = &ne->device;
 855         ne->node_dev.class = &nodemgr_ne_class;
 856         snprintf(ne->node_dev.bus_id, BUS_ID_SIZE, "%016Lx",
 857                 (unsigned long long)(ne->guid));
 858
 859         if (device_register(&ne->device))
 860                 goto fail_devreg;
 861         if (device_register(&ne->node_dev))
 862                 goto fail_classdevreg;
 863         get_device(&ne->device);
 864
 865         nodemgr_create_ne_dev_files(ne);
 866
 867         nodemgr_update_bus_options(ne);
 868
 869         HPSB_DEBUG("%s added: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 870                    (host->node_id == nodeid) ? "Host" : "Node",
 871                    NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
 872
 873         return ne;
 874
 875 fail_classdevreg:
 876         device_unregister(&ne->device);
 877 fail_devreg:
 878         kfree(ne);
 879 fail_alloc:
 880         HPSB_ERR("Failed to create node ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 881                  NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
 882
 883         return NULL;
 884 }
 885
 886
 887 static struct node_entry *find_entry_by_guid(u64 guid)
 888 {
 889         struct device *dev;
 890         struct node_entry *ne, *ret_ne = NULL;
 891
 892         down(&nodemgr_ne_class.sem);
 893         list_for_each_entry(dev, &nodemgr_ne_class.devices, node) {
 894                 ne = container_of(dev, struct node_entry, node_dev);
 895
 896                 if (ne->guid == guid) {
 897                         ret_ne = ne;
 898                         break;
 899                 }
 900         }
 901         up(&nodemgr_ne_class.sem);
 902
 903         return ret_ne;
 904 }
 905
 906
 907 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
 908                                                nodeid_t nodeid)
 909 {
 910         struct device *dev;
 911         struct node_entry *ne, *ret_ne = NULL;
 912
 913         down(&nodemgr_ne_class.sem);
 914         list_for_each_entry(dev, &nodemgr_ne_class.devices, node) {
 915                 ne = container_of(dev, struct node_entry, node_dev);
 916
 917                 if (ne->host == host && ne->nodeid == nodeid) {
 918                         ret_ne = ne;
 919                         break;
 920                 }
 921         }
 922         up(&nodemgr_ne_class.sem);
 923
 924         return ret_ne;
 925 }
 926
 927
 928 static void nodemgr_register_device(struct node_entry *ne,
 929         struct unit_directory *ud, struct device *parent)
 930 {
 931         memcpy(&ud->device, &nodemgr_dev_template_ud,
 932                sizeof(ud->device));
 933
 934         ud->device.parent = parent;
 935
 936         snprintf(ud->device.bus_id, BUS_ID_SIZE, "%s-%u",
 937                  ne->device.bus_id, ud->id);
 938
 939         ud->unit_dev.parent = &ud->device;
 940         ud->unit_dev.class = &nodemgr_ud_class;
 941         snprintf(ud->unit_dev.bus_id, BUS_ID_SIZE, "%s-%u",
 942                  ne->device.bus_id, ud->id);
 943
 944         if (device_register(&ud->device))
 945                 goto fail_devreg;
 946         if (device_register(&ud->unit_dev))
 947                 goto fail_classdevreg;
 948         get_device(&ud->device);
 949
 950         nodemgr_create_ud_dev_files(ud);
 951
 952         return;
 953
 954 fail_classdevreg:
 955         device_unregister(&ud->device);
 956 fail_devreg:
 957         HPSB_ERR("Failed to create unit %s", ud->device.bus_id);
 958 }
 959
 960
 961 /* This implementation currently only scans the config rom and its
 962  * immediate unit directories looking for software_id and
 963  * software_version entries, in order to get driver autoloading working. */
 964 static struct unit_directory *nodemgr_process_unit_directory
 965         (struct host_info *hi, struct node_entry *ne, struct csr1212_keyval *ud_kv,
 966          unsigned int *id, struct unit_directory *parent)
 967 {
 968         struct unit_directory *ud;
 969         struct unit_directory *ud_child = NULL;
 970         struct csr1212_dentry *dentry;
 971         struct csr1212_keyval *kv;
 972         u8 last_key_id = 0;
 973
 974         ud = kzalloc(sizeof(*ud), GFP_KERNEL);
 975         if (!ud)
 976                 goto unit_directory_error;
 977
 978         ud->ne = ne;
 979         ud->ignore_driver = ignore_drivers;
 980         ud->address = ud_kv->offset + CSR1212_REGISTER_SPACE_BASE;
 981         ud->directory_id = ud->address & 0xffffff;
 982         ud->ud_kv = ud_kv;
 983         ud->id = (*id)++;
 984
 985         csr1212_for_each_dir_entry(ne->csr, kv, ud_kv, dentry) {
 986                 switch (kv->key.id) {
 987                 case CSR1212_KV_ID_VENDOR:
 988                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
 989                                 ud->vendor_id = kv->value.immediate;
 990                                 ud->flags |= UNIT_DIRECTORY_VENDOR_ID;
 991                         }
 992                         break;
 993
 994                 case CSR1212_KV_ID_MODEL:
 995                         ud->model_id = kv->value.immediate;
 996                         ud->flags |= UNIT_DIRECTORY_MODEL_ID;
 997                         break;
 998
 999                 case CSR1212_KV_ID_SPECIFIER_ID:
1000                         ud->specifier_id = kv->value.immediate;
1001                         ud->flags |= UNIT_DIRECTORY_SPECIFIER_ID;
1002                         break;
1003
1004                 case CSR1212_KV_ID_VERSION:
1005                         ud->version = kv->value.immediate;
1006                         ud->flags |= UNIT_DIRECTORY_VERSION;
1007                         break;
1008
1009                 case CSR1212_KV_ID_DESCRIPTOR:
1010                         if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1011                             CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1012                             CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1013                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1014                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1015                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1016                                 switch (last_key_id) {
1017                                 case CSR1212_KV_ID_VENDOR:
1018                                         ud->vendor_name_kv = kv;
1019                                         csr1212_keep_keyval(kv);
1020                                         break;
1021
1022                                 case CSR1212_KV_ID_MODEL:
1023                                         ud->model_name_kv = kv;
1024                                         csr1212_keep_keyval(kv);
1025                                         break;
1026
1027                                 }
1028                         } /* else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) ... */
1029                         break;
1030
1031                 case CSR1212_KV_ID_DEPENDENT_INFO:
1032                         /* Logical Unit Number */
1033                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
1034                                 if (ud->flags & UNIT_DIRECTORY_HAS_LUN) {
1035                                         ud_child = kmemdup(ud, sizeof(*ud_child), GFP_KERNEL);
1036                                         if (!ud_child)
1037                                                 goto unit_directory_error;
1038                                         nodemgr_register_device(ne, ud_child, &ne->device);
1039                                         ud_child = NULL;
1040
1041                                         ud->id = (*id)++;
1042                                 }
1043                                 ud->lun = kv->value.immediate;
1044                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN;
1045
1046                         /* Logical Unit Directory */
1047                         } else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) {
1048                                 /* This should really be done in SBP2 as this is
1049                                  * doing SBP2 specific parsing.
1050                                  */
1051
1052                                 /* first register the parent unit */
1053                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN_DIRECTORY;
1054                                 if (ud->device.bus != &ieee1394_bus_type)
1055                                         nodemgr_register_device(ne, ud, &ne->device);
1056
1057                                 /* process the child unit */
1058                                 ud_child = nodemgr_process_unit_directory(hi, ne, kv, id, ud);
1059
1060                                 if (ud_child == NULL)
1061                                         break;
1062
1063                                 /* inherit unspecified values, the driver core picks it up */
1064                                 if ((ud->flags & UNIT_DIRECTORY_MODEL_ID) &&
1065                                     !(ud_child->flags & UNIT_DIRECTORY_MODEL_ID))
1066                                 {
1067                                         ud_child->flags |=  UNIT_DIRECTORY_MODEL_ID;
1068                                         ud_child->model_id = ud->model_id;
1069                                 }
1070                                 if ((ud->flags & UNIT_DIRECTORY_SPECIFIER_ID) &&
1071                                     !(ud_child->flags & UNIT_DIRECTORY_SPECIFIER_ID))
1072                                 {
1073                                         ud_child->flags |=  UNIT_DIRECTORY_SPECIFIER_ID;
1074                                         ud_child->specifier_id = ud->specifier_id;
1075                                 }
1076                                 if ((ud->flags & UNIT_DIRECTORY_VERSION) &&
1077                                     !(ud_child->flags & UNIT_DIRECTORY_VERSION))
1078                                 {
1079                                         ud_child->flags |=  UNIT_DIRECTORY_VERSION;
1080                                         ud_child->version = ud->version;
1081                                 }
1082
1083                                 /* register the child unit */
1084                                 ud_child->flags |= UNIT_DIRECTORY_LUN_DIRECTORY;
1085                                 nodemgr_register_device(ne, ud_child, &ud->device);
1086                         }
1087
1088                         break;
1089
1090                 case CSR1212_KV_ID_DIRECTORY_ID:
1091                         ud->directory_id = kv->value.immediate;
1092                         break;
1093
1094                 default:
1095                         break;
1096                 }
1097                 last_key_id = kv->key.id;
1098         }
1099
1100         /* do not process child units here and only if not already registered */
1101         if (!parent && ud->device.bus != &ieee1394_bus_type)
1102                 nodemgr_register_device(ne, ud, &ne->device);
1103
1104         return ud;
1105
1106 unit_directory_error:
1107         kfree(ud);
1108         return NULL;
1109 }
1110
1111
1112 static void nodemgr_process_root_directory(struct host_info *hi, struct node_entry *ne)
1113 {
1114         unsigned int ud_id = 0;
1115         struct csr1212_dentry *dentry;
1116         struct csr1212_keyval *kv;
1117         u8 last_key_id = 0;
1118
1119         ne->needs_probe = 0;
1120
1121         csr1212_for_each_dir_entry(ne->csr, kv, ne->csr->root_kv, dentry) {
1122                 switch (kv->key.id) {
1123                 case CSR1212_KV_ID_VENDOR:
1124                         ne->vendor_id = kv->value.immediate;
1125                         break;
1126
1127                 case CSR1212_KV_ID_NODE_CAPABILITIES:
1128                         ne->capabilities = kv->value.immediate;
1129                         break;
1130
1131                 case CSR1212_KV_ID_UNIT:
1132                         nodemgr_process_unit_directory(hi, ne, kv, &ud_id, NULL);
1133                         break;
1134
1135                 case CSR1212_KV_ID_DESCRIPTOR:
1136                         if (last_key_id == CSR1212_KV_ID_VENDOR) {
1137                                 if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1138                                     CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1139                                     CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1140                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1141                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1142                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1143                                         ne->vendor_name_kv = kv;
1144                                         csr1212_keep_keyval(kv);
1145                                 }
1146                         }
1147                         break;
1148                 }
1149                 last_key_id = kv->key.id;
1150         }
1151
1152         if (ne->vendor_name_kv) {
1153                 int error = device_create_file(&ne->device,
1154                                                &dev_attr_ne_vendor_name_kv);
1155
1156                 if (error && error != -EEXIST)
1157                         HPSB_ERR("Failed to add sysfs attribute");
1158         }
1159 }
1160
1161 #ifdef CONFIG_HOTPLUG
1162
1163 static int nodemgr_uevent(struct device *dev, char **envp, int num_envp,
1164                           char *buffer, int buffer_size)
1165 {
1166         struct unit_directory *ud;
1167         int i = 0;
1168         int length = 0;
1169         int retval = 0;
1170         /* ieee1394:venNmoNspNverN */
1171         char buf[8 + 1 + 3 + 8 + 2 + 8 + 2 + 8 + 3 + 8 + 1];
1172
1173         if (!dev)
1174                 return -ENODEV;
1175
1176         ud = container_of(dev, struct unit_directory, unit_dev);
1177
1178         if (ud->ne->in_limbo || ud->ignore_driver)
1179                 return -ENODEV;
1180
1181 #define PUT_ENVP(fmt,val)                                       \
1182 do {                                                            \
1183         retval = add_uevent_var(envp, num_envp, &i,             \
1184                                 buffer, buffer_size, &length,   \
1185                                 fmt, val);                      \
1186         if (retval)                                             \
1187                 return retval;                                  \
1188 } while (0)
1189
1190         PUT_ENVP("VENDOR_ID=%06x", ud->vendor_id);
1191         PUT_ENVP("MODEL_ID=%06x", ud->model_id);
1192         PUT_ENVP("GUID=%016Lx", (unsigned long long)ud->ne->guid);
1193         PUT_ENVP("SPECIFIER_ID=%06x", ud->specifier_id);
1194         PUT_ENVP("VERSION=%06x", ud->version);
1195         snprintf(buf, sizeof(buf), "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
1196                         ud->vendor_id,
1197                         ud->model_id,
1198                         ud->specifier_id,
1199                         ud->version);
1200         PUT_ENVP("MODALIAS=%s", buf);
1201
1202 #undef PUT_ENVP
1203
1204         envp[i] = NULL;
1205
1206         return 0;
1207 }
1208
1209 #else
1210
1211 static int nodemgr_uevent(struct device *dev, char **envp, int num_envp,
1212                           char *buffer, int buffer_size)
1213 {
1214         return -ENODEV;
1215 }
1216
1217 #endif /* CONFIG_HOTPLUG */
1218
1219
1220 int __hpsb_register_protocol(struct hpsb_protocol_driver *drv,
1221                              struct module *owner)
1222 {
1223         int error;
1224
1225         drv->driver.bus = &ieee1394_bus_type;
1226         drv->driver.owner = owner;
1227         drv->driver.name = drv->name;
1228
1229         /* This will cause a probe for devices */
1230         error = driver_register(&drv->driver);
1231         if (!error)
1232                 nodemgr_create_drv_files(drv);
1233         return error;
1234 }
1235
1236 void hpsb_unregister_protocol(struct hpsb_protocol_driver *driver)
1237 {
1238         nodemgr_remove_drv_files(driver);
1239         /* This will subsequently disconnect all devices that our driver
1240          * is attached to. */
1241         driver_unregister(&driver->driver);
1242 }
1243
1244
1245 /*
1246  * This function updates nodes that were present on the bus before the
1247  * reset and still are after the reset.  The nodeid and the config rom
1248  * may have changed, and the drivers managing this device must be
1249  * informed that this device just went through a bus reset, to allow
1250  * the to take whatever actions required.
1251  */
1252 static void nodemgr_update_node(struct node_entry *ne, struct csr1212_csr *csr,
1253                                 struct host_info *hi, nodeid_t nodeid,
1254                                 unsigned int generation)
1255 {
1256         if (ne->nodeid != nodeid) {
1257                 HPSB_DEBUG("Node changed: " NODE_BUS_FMT " -> " NODE_BUS_FMT,
1258                            NODE_BUS_ARGS(ne->host, ne->nodeid),
1259                            NODE_BUS_ARGS(ne->host, nodeid));
1260                 ne->nodeid = nodeid;
1261         }
1262
1263         if (ne->busopt.generation != ((be32_to_cpu(csr->bus_info_data[2]) >> 4) & 0xf)) {
1264                 kfree(ne->csr->private);
1265                 csr1212_destroy_csr(ne->csr);
1266                 ne->csr = csr;
1267
1268                 /* If the node's configrom generation has changed, we
1269                  * unregister all the unit directories. */
1270                 nodemgr_remove_uds(ne);
1271
1272                 nodemgr_update_bus_options(ne);
1273
1274                 /* Mark the node as new, so it gets re-probed */
1275                 ne->needs_probe = 1;
1276         } else {
1277                 /* old cache is valid, so update its generation */
1278                 struct nodemgr_csr_info *ci = ne->csr->private;
1279                 ci->generation = generation;
1280                 /* free the partially filled now unneeded new cache */
1281                 kfree(csr->private);
1282                 csr1212_destroy_csr(csr);
1283         }
1284
1285         if (ne->in_limbo)
1286                 nodemgr_resume_ne(ne);
1287
1288         /* Mark the node current */
1289         ne->generation = generation;
1290 }
1291
1292
1293
1294 static void nodemgr_node_scan_one(struct host_info *hi,
1295                                   nodeid_t nodeid, int generation)
1296 {
1297         struct hpsb_host *host = hi->host;
1298         struct node_entry *ne;
1299         octlet_t guid;
1300         struct csr1212_csr *csr;
1301         struct nodemgr_csr_info *ci;
1302         u8 *speed;
1303
1304         ci = kmalloc(sizeof(*ci), GFP_KERNEL);
1305         if (!ci)
1306                 return;
1307
1308         ci->host = host;
1309         ci->nodeid = nodeid;
1310         ci->generation = generation;
1311
1312         /* Prepare for speed probe which occurs when reading the ROM */
1313         speed = &(host->speed[NODEID_TO_NODE(nodeid)]);
1314         if (*speed > host->csr.lnk_spd)
1315                 *speed = host->csr.lnk_spd;
1316         ci->speed_unverified = *speed > IEEE1394_SPEED_100;
1317
1318         /* We need to detect when the ConfigROM's generation has changed,
1319          * so we only update the node's info when it needs to be.  */
1320
1321         csr = csr1212_create_csr(&nodemgr_csr_ops, 5 * sizeof(quadlet_t), ci);
1322         if (!csr || csr1212_parse_csr(csr) != CSR1212_SUCCESS) {
1323                 HPSB_ERR("Error parsing configrom for node " NODE_BUS_FMT,
1324                          NODE_BUS_ARGS(host, nodeid));
1325                 if (csr)
1326                         csr1212_destroy_csr(csr);
1327                 kfree(ci);
1328                 return;
1329         }
1330
1331         if (csr->bus_info_data[1] != IEEE1394_BUSID_MAGIC) {
1332                 /* This isn't a 1394 device, but we let it slide. There
1333                  * was a report of a device with broken firmware which
1334                  * reported '2394' instead of '1394', which is obviously a
1335                  * mistake. One would hope that a non-1394 device never
1336                  * gets connected to Firewire bus. If someone does, we
1337                  * shouldn't be held responsible, so we'll allow it with a
1338                  * warning.  */
1339                 HPSB_WARN("Node " NODE_BUS_FMT " has invalid busID magic [0x%08x]",
1340                           NODE_BUS_ARGS(host, nodeid), csr->bus_info_data[1]);
1341         }
1342
1343         guid = ((u64)be32_to_cpu(csr->bus_info_data[3]) << 32) | be32_to_cpu(csr->bus_info_data[4]);
1344         ne = find_entry_by_guid(guid);
1345
1346         if (ne && ne->host != host && ne->in_limbo) {
1347                 /* Must have moved this device from one host to another */
1348                 nodemgr_remove_ne(ne);
1349                 ne = NULL;
1350         }
1351
1352         if (!ne)
1353                 nodemgr_create_node(guid, csr, hi, nodeid, generation);
1354         else
1355                 nodemgr_update_node(ne, csr, hi, nodeid, generation);
1356 }
1357
1358
1359 static void nodemgr_node_scan(struct host_info *hi, int generation)
1360 {
1361         int count;
1362         struct hpsb_host *host = hi->host;
1363         struct selfid *sid = (struct selfid *)host->topology_map;
1364         nodeid_t nodeid = LOCAL_BUS;
1365
1366         /* Scan each node on the bus */
1367         for (count = host->selfid_count; count; count--, sid++) {
1368                 if (sid->extended)
1369                         continue;
1370
1371                 if (!sid->link_active) {
1372                         nodeid++;
1373                         continue;
1374                 }
1375                 nodemgr_node_scan_one(hi, nodeid++, generation);
1376         }
1377 }
1378
1379
1380 static void nodemgr_suspend_ne(struct node_entry *ne)
1381 {
1382         struct device *dev;
1383         struct unit_directory *ud;
1384         struct device_driver *drv;
1385         int error;
1386
1387         HPSB_DEBUG("Node suspended: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1388                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1389
1390         ne->in_limbo = 1;
1391         WARN_ON(device_create_file(&ne->device, &dev_attr_ne_in_limbo));
1392
1393         down(&nodemgr_ud_class.sem);
1394         list_for_each_entry(dev, &nodemgr_ud_class.devices, node) {
1395                 ud = container_of(dev, struct unit_directory, unit_dev);
1396                 if (ud->ne != ne)
1397                         continue;
1398
1399                 drv = get_driver(ud->device.driver);
1400                 if (!drv)
1401                         continue;
1402
1403                 error = 1; /* release if suspend is not implemented */
1404                 if (drv->suspend) {
1405                         down(&ud->device.sem);
1406                         error = drv->suspend(&ud->device, PMSG_SUSPEND);
1407                         up(&ud->device.sem);
1408                 }
1409                 if (error)
1410                         device_release_driver(&ud->device);
1411                 put_driver(drv);
1412         }
1413         up(&nodemgr_ud_class.sem);
1414 }
1415
1416
1417 static void nodemgr_resume_ne(struct node_entry *ne)
1418 {
1419         struct device *dev;
1420         struct unit_directory *ud;
1421         struct device_driver *drv;
1422
1423         ne->in_limbo = 0;
1424         device_remove_file(&ne->device, &dev_attr_ne_in_limbo);
1425
1426         down(&nodemgr_ud_class.sem);
1427         list_for_each_entry(dev, &nodemgr_ud_class.devices, node) {
1428                 ud = container_of(dev, struct unit_directory, unit_dev);
1429                 if (ud->ne != ne)
1430                         continue;
1431
1432                 drv = get_driver(ud->device.driver);
1433                 if (!drv)
1434                         continue;
1435
1436                 if (drv->resume) {
1437                         down(&ud->device.sem);
1438                         drv->resume(&ud->device);
1439                         up(&ud->device.sem);
1440                 }
1441                 put_driver(drv);
1442         }
1443         up(&nodemgr_ud_class.sem);
1444
1445         HPSB_DEBUG("Node resumed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1446                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1447 }
1448
1449
1450 static void nodemgr_update_pdrv(struct node_entry *ne)
1451 {
1452         struct device *dev;
1453         struct unit_directory *ud;
1454         struct device_driver *drv;
1455         struct hpsb_protocol_driver *pdrv;
1456         int error;
1457
1458         down(&nodemgr_ud_class.sem);
1459         list_for_each_entry(dev, &nodemgr_ud_class.devices, node) {
1460                 ud = container_of(dev, struct unit_directory, unit_dev);
1461                 if (ud->ne != ne)
1462                         continue;
1463
1464                 drv = get_driver(ud->device.driver);
1465                 if (!drv)
1466                         continue;
1467
1468                 error = 0;
1469                 pdrv = container_of(drv, struct hpsb_protocol_driver, driver);
1470                 if (pdrv->update) {
1471                         down(&ud->device.sem);
1472                         error = pdrv->update(ud);
1473                         up(&ud->device.sem);
1474                 }
1475                 if (error)
1476                         device_release_driver(&ud->device);
1477                 put_driver(drv);
1478         }
1479         up(&nodemgr_ud_class.sem);
1480 }
1481
1482
1483 /* Write the BROADCAST_CHANNEL as per IEEE1394a 8.3.2.3.11 and 8.4.2.3.  This
1484  * seems like an optional service but in the end it is practically mandatory
1485  * as a consequence of these clauses.
1486  *
1487  * Note that we cannot do a broadcast write to all nodes at once because some
1488  * pre-1394a devices would hang. */
1489 static void nodemgr_irm_write_bc(struct node_entry *ne, int generation)
1490 {
1491         const u64 bc_addr = (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL);
1492         quadlet_t bc_remote, bc_local;
1493         int error;
1494
1495         if (!ne->host->is_irm || ne->generation != generation ||
1496             ne->nodeid == ne->host->node_id)
1497                 return;
1498
1499         bc_local = cpu_to_be32(ne->host->csr.broadcast_channel);
1500
1501         /* Check if the register is implemented and 1394a compliant. */
1502         error = hpsb_read(ne->host, ne->nodeid, generation, bc_addr, &bc_remote,
1503                           sizeof(bc_remote));
1504         if (!error && bc_remote & cpu_to_be32(0x80000000) &&
1505             bc_remote != bc_local)
1506                 hpsb_node_write(ne, bc_addr, &bc_local, sizeof(bc_local));
1507 }
1508
1509
1510 static void nodemgr_probe_ne(struct host_info *hi, struct node_entry *ne, int generation)
1511 {
1512         struct device *dev;
1513
1514         if (ne->host != hi->host || ne->in_limbo)
1515                 return;
1516
1517         dev = get_device(&ne->device);
1518         if (!dev)
1519                 return;
1520
1521         nodemgr_irm_write_bc(ne, generation);
1522
1523         /* If "needs_probe", then this is either a new or changed node we
1524          * rescan totally. If the generation matches for an existing node
1525          * (one that existed prior to the bus reset) we send update calls
1526          * down to the drivers. Otherwise, this is a dead node and we
1527          * suspend it. */
1528         if (ne->needs_probe)
1529                 nodemgr_process_root_directory(hi, ne);
1530         else if (ne->generation == generation)
1531                 nodemgr_update_pdrv(ne);
1532         else
1533                 nodemgr_suspend_ne(ne);
1534
1535         put_device(dev);
1536 }
1537
1538
1539 static void nodemgr_node_probe(struct host_info *hi, int generation)
1540 {
1541         struct hpsb_host *host = hi->host;
1542         struct device *dev;
1543         struct node_entry *ne;
1544
1545         /* Do some processing of the nodes we've probed. This pulls them
1546          * into the sysfs layer if needed, and can result in processing of
1547          * unit-directories, or just updating the node and it's
1548          * unit-directories.
1549          *
1550          * Run updates before probes. Usually, updates are time-critical
1551          * while probes are time-consuming. (Well, those probes need some
1552          * improvement...) */
1553
1554         down(&nodemgr_ne_class.sem);
1555         list_for_each_entry(dev, &nodemgr_ne_class.devices, node) {
1556                 ne = container_of(dev, struct node_entry, node_dev);
1557                 if (!ne->needs_probe)
1558                         nodemgr_probe_ne(hi, ne, generation);
1559         }
1560         list_for_each_entry(dev, &nodemgr_ne_class.devices, node) {
1561                 ne = container_of(dev, struct node_entry, node_dev);
1562                 if (ne->needs_probe)
1563                         nodemgr_probe_ne(hi, ne, generation);
1564         }
1565         up(&nodemgr_ne_class.sem);
1566
1567
1568         /* If we had a bus reset while we were scanning the bus, it is
1569          * possible that we did not probe all nodes.  In that case, we
1570          * skip the clean up for now, since we could remove nodes that
1571          * were still on the bus.  Another bus scan is pending which will
1572          * do the clean up eventually.
1573          *
1574          * Now let's tell the bus to rescan our devices. This may seem
1575          * like overhead, but the driver-model core will only scan a
1576          * device for a driver when either the device is added, or when a
1577          * new driver is added. A bus reset is a good reason to rescan
1578          * devices that were there before.  For example, an sbp2 device
1579          * may become available for login, if the host that held it was
1580          * just removed.  */
1581
1582         if (generation == get_hpsb_generation(host))
1583                 if (bus_rescan_devices(&ieee1394_bus_type))
1584                         HPSB_DEBUG("bus_rescan_devices had an error");
1585 }
1586
1587 static int nodemgr_send_resume_packet(struct hpsb_host *host)
1588 {
1589         struct hpsb_packet *packet;
1590         int error = -ENOMEM;
1591
1592         packet = hpsb_make_phypacket(host,
1593                         EXTPHYPACKET_TYPE_RESUME |
1594                         NODEID_TO_NODE(host->node_id) << PHYPACKET_PORT_SHIFT);
1595         if (packet) {
1596                 packet->no_waiter = 1;
1597                 packet->generation = get_hpsb_generation(host);
1598                 error = hpsb_send_packet(packet);
1599         }
1600         if (error)
1601                 HPSB_WARN("fw-host%d: Failed to broadcast resume packet",
1602                           host->id);
1603         return error;
1604 }
1605
1606 /* Perform a few high-level IRM responsibilities. */
1607 static int nodemgr_do_irm_duties(struct hpsb_host *host, int cycles)
1608 {
1609         quadlet_t bc;
1610
1611         /* if irm_id == -1 then there is no IRM on this bus */
1612         if (!host->is_irm || host->irm_id == (nodeid_t)-1)
1613                 return 1;
1614
1615         /* We are a 1394a-2000 compliant IRM. Set the validity bit. */
1616         host->csr.broadcast_channel |= 0x40000000;
1617
1618         /* If there is no bus manager then we should set the root node's
1619          * force_root bit to promote bus stability per the 1394
1620          * spec. (8.4.2.6) */
1621         if (host->busmgr_id == 0xffff && host->node_count > 1)
1622         {
1623                 u16 root_node = host->node_count - 1;
1624
1625                 /* get cycle master capability flag from root node */
1626                 if (host->is_cycmst ||
1627                     (!hpsb_read(host, LOCAL_BUS | root_node, get_hpsb_generation(host),
1628                                 (CSR_REGISTER_BASE + CSR_CONFIG_ROM + 2 * sizeof(quadlet_t)),
1629                                 &bc, sizeof(quadlet_t)) &&
1630                      be32_to_cpu(bc) & 1 << CSR_CMC_SHIFT))
1631                         hpsb_send_phy_config(host, root_node, -1);
1632                 else {
1633                         HPSB_DEBUG("The root node is not cycle master capable; "
1634                                    "selecting a new root node and resetting...");
1635
1636                         if (cycles >= 5) {
1637                                 /* Oh screw it! Just leave the bus as it is */
1638                                 HPSB_DEBUG("Stopping reset loop for IRM sanity");
1639                                 return 1;
1640                         }
1641
1642                         hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1643                         hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1644
1645                         return 0;
1646                 }
1647         }
1648
1649         /* Some devices suspend their ports while being connected to an inactive
1650          * host adapter, i.e. if connected before the low-level driver is
1651          * loaded.  They become visible either when physically unplugged and
1652          * replugged, or when receiving a resume packet.  Send one once. */
1653         if (!host->resume_packet_sent && !nodemgr_send_resume_packet(host))
1654                 host->resume_packet_sent = 1;
1655
1656         return 1;
1657 }
1658
1659 /* We need to ensure that if we are not the IRM, that the IRM node is capable of
1660  * everything we can do, otherwise issue a bus reset and try to become the IRM
1661  * ourselves. */
1662 static int nodemgr_check_irm_capability(struct hpsb_host *host, int cycles)
1663 {
1664         quadlet_t bc;
1665         int status;
1666
1667         if (hpsb_disable_irm || host->is_irm)
1668                 return 1;
1669
1670         status = hpsb_read(host, LOCAL_BUS | (host->irm_id),
1671                            get_hpsb_generation(host),
1672                            (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL),
1673                            &bc, sizeof(quadlet_t));
1674
1675         if (status < 0 || !(be32_to_cpu(bc) & 0x80000000)) {
1676                 /* The current irm node does not have a valid BROADCAST_CHANNEL
1677                  * register and we do, so reset the bus with force_root set */
1678                 HPSB_DEBUG("Current remote IRM is not 1394a-2000 compliant, resetting...");
1679
1680                 if (cycles >= 5) {
1681                         /* Oh screw it! Just leave the bus as it is */
1682                         HPSB_DEBUG("Stopping reset loop for IRM sanity");
1683                         return 1;
1684                 }
1685
1686                 hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1687                 hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1688
1689                 return 0;
1690         }
1691
1692         return 1;
1693 }
1694
1695 static int nodemgr_host_thread(void *__hi)
1696 {
1697         struct host_info *hi = (struct host_info *)__hi;
1698         struct hpsb_host *host = hi->host;
1699         unsigned int g, generation = 0;
1700         int i, reset_cycles = 0;
1701
1702         set_freezable();
1703         /* Setup our device-model entries */
1704         nodemgr_create_host_dev_files(host);
1705
1706         for (;;) {
1707                 /* Sleep until next bus reset */
1708                 set_current_state(TASK_INTERRUPTIBLE);
1709                 if (get_hpsb_generation(host) == generation &&
1710                     !kthread_should_stop())
1711                         schedule();
1712                 __set_current_state(TASK_RUNNING);
1713
1714                 /* Thread may have been woken up to freeze or to exit */
1715                 if (try_to_freeze())
1716                         continue;
1717                 if (kthread_should_stop())
1718                         goto exit;
1719
1720                 /* Pause for 1/4 second in 1/16 second intervals,
1721                  * to make sure things settle down. */
1722                 g = get_hpsb_generation(host);
1723                 for (i = 0; i < 4 ; i++) {
1724                         if (msleep_interruptible(63) || kthread_should_stop())
1725                                 goto exit;
1726
1727                         /* Now get the generation in which the node ID's we collect
1728                          * are valid.  During the bus scan we will use this generation
1729                          * for the read transactions, so that if another reset occurs
1730                          * during the scan the transactions will fail instead of
1731                          * returning bogus data. */
1732                         generation = get_hpsb_generation(host);
1733
1734                         /* If we get a reset before we are done waiting, then
1735                          * start the waiting over again */
1736                         if (generation != g)
1737                                 g = generation, i = 0;
1738                 }
1739
1740                 if (!nodemgr_check_irm_capability(host, reset_cycles) ||
1741                     !nodemgr_do_irm_duties(host, reset_cycles)) {
1742                         reset_cycles++;
1743                         continue;
1744                 }
1745                 reset_cycles = 0;
1746
1747                 /* Scan our nodes to get the bus options and create node
1748                  * entries. This does not do the sysfs stuff, since that
1749                  * would trigger uevents and such, which is a bad idea at
1750                  * this point. */
1751                 nodemgr_node_scan(hi, generation);
1752
1753                 /* This actually does the full probe, with sysfs
1754                  * registration. */
1755                 nodemgr_node_probe(hi, generation);
1756
1757                 /* Update some of our sysfs symlinks */
1758                 nodemgr_update_host_dev_links(host);
1759         }
1760 exit:
1761         HPSB_VERBOSE("NodeMgr: Exiting thread");
1762         return 0;
1763 }
1764
1765 /**
1766  * nodemgr_for_each_host - call a function for each IEEE 1394 host
1767  * @data: an address to supply to the callback
1768  * @cb: function to call for each host
1769  *
1770  * Iterate the hosts, calling a given function with supplied data for each host.
1771  * If the callback fails on a host, i.e. if it returns a non-zero value, the
1772  * iteration is stopped.
1773  *
1774  * Return value: 0 on success, non-zero on failure (same as returned by last run
1775  * of the callback).
1776  */
1777 int nodemgr_for_each_host(void *data, int (*cb)(struct hpsb_host *, void *))
1778 {
1779         struct device *dev;
1780         struct hpsb_host *host;
1781         int error = 0;
1782
1783         down(&hpsb_host_class.sem);
1784         list_for_each_entry(dev, &hpsb_host_class.devices, node) {
1785                 host = container_of(dev, struct hpsb_host, host_dev);
1786
1787                 if ((error = cb(host, data)))
1788                         break;
1789         }
1790         up(&hpsb_host_class.sem);
1791
1792         return error;
1793 }
1794
1795 /* The following two convenience functions use a struct node_entry
1796  * for addressing a node on the bus.  They are intended for use by any
1797  * process context, not just the nodemgr thread, so we need to be a
1798  * little careful when reading out the node ID and generation.  The
1799  * thing that can go wrong is that we get the node ID, then a bus
1800  * reset occurs, and then we read the generation.  The node ID is
1801  * possibly invalid, but the generation is current, and we end up
1802  * sending a packet to a the wrong node.
1803  *
1804  * The solution is to make sure we read the generation first, so that
1805  * if a reset occurs in the process, we end up with a stale generation
1806  * and the transactions will fail instead of silently using wrong node
1807  * ID's.
1808  */
1809
1810 /**
1811  * hpsb_node_fill_packet - fill some destination information into a packet
1812  * @ne: destination node
1813  * @packet: packet to fill in
1814  *
1815  * This will fill in the given, pre-initialised hpsb_packet with the current
1816  * information from the node entry (host, node ID, bus generation number).
1817  */
1818 void hpsb_node_fill_packet(struct node_entry *ne, struct hpsb_packet *packet)
1819 {
1820         packet->host = ne->host;
1821         packet->generation = ne->generation;
1822         barrier();
1823         packet->node_id = ne->nodeid;
1824 }
1825
1826 int hpsb_node_write(struct node_entry *ne, u64 addr,
1827                     quadlet_t *buffer, size_t length)
1828 {
1829         unsigned int generation = ne->generation;
1830
1831         barrier();
1832         return hpsb_write(ne->host, ne->nodeid, generation,
1833                           addr, buffer, length);
1834 }
1835
1836 static void nodemgr_add_host(struct hpsb_host *host)
1837 {
1838         struct host_info *hi;
1839
1840         hi = hpsb_create_hostinfo(&nodemgr_highlevel, host, sizeof(*hi));
1841         if (!hi) {
1842                 HPSB_ERR("NodeMgr: out of memory in add host");
1843                 return;
1844         }
1845         hi->host = host;
1846         hi->thread = kthread_run(nodemgr_host_thread, hi, "knodemgrd_%d",
1847                                  host->id);
1848         if (IS_ERR(hi->thread)) {
1849                 HPSB_ERR("NodeMgr: cannot start thread for host %d", host->id);
1850                 hpsb_destroy_hostinfo(&nodemgr_highlevel, host);
1851         }
1852 }
1853
1854 static void nodemgr_host_reset(struct hpsb_host *host)
1855 {
1856         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1857
1858         if (hi) {
1859                 HPSB_VERBOSE("NodeMgr: Processing reset for host %d", host->id);
1860                 wake_up_process(hi->thread);
1861         }
1862 }
1863
1864 static void nodemgr_remove_host(struct hpsb_host *host)
1865 {
1866         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1867
1868         if (hi) {
1869                 kthread_stop(hi->thread);
1870                 nodemgr_remove_host_dev(&host->device);
1871         }
1872 }
1873
1874 static struct hpsb_highlevel nodemgr_highlevel = {
1875         .name =         "Node manager",
1876         .add_host =     nodemgr_add_host,
1877         .host_reset =   nodemgr_host_reset,
1878         .remove_host =  nodemgr_remove_host,
1879 };
1880
1881 int init_ieee1394_nodemgr(void)
1882 {
1883         int error;
1884
1885         error = class_register(&nodemgr_ne_class);
1886         if (error)
1887                 goto fail_ne;
1888         error = class_register(&nodemgr_ud_class);
1889         if (error)
1890                 goto fail_ud;
1891         error = driver_register(&nodemgr_mid_layer_driver);
1892         if (error)
1893                 goto fail_ml;
1894         /* This driver is not used if nodemgr is off (disable_nodemgr=1). */
1895         nodemgr_dev_template_host.driver = &nodemgr_mid_layer_driver;
1896
1897         hpsb_register_highlevel(&nodemgr_highlevel);
1898         return 0;
1899
1900 fail_ml:
1901         class_unregister(&nodemgr_ud_class);
1902 fail_ud:
1903         class_unregister(&nodemgr_ne_class);
1904 fail_ne:
1905         return error;
1906 }
1907
1908 void cleanup_ieee1394_nodemgr(void)
1909 {
1910         hpsb_unregister_highlevel(&nodemgr_highlevel);
1911         driver_unregister(&nodemgr_mid_layer_driver);
1912         class_unregister(&nodemgr_ud_class);
1913         class_unregister(&nodemgr_ne_class);
1914 }