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, struct kobj_uevent_env *env);
 157 static void nodemgr_resume_ne(struct node_entry *ne);
 158 static void nodemgr_remove_ne(struct node_entry *ne);
 159 static struct node_entry *find_entry_by_guid(u64 guid);
 160
 161 struct bus_type ieee1394_bus_type = {
 162         .name           = "ieee1394",
 163         .match          = nodemgr_bus_match,
 164 };
 165
 166 static void host_cls_release(struct device *dev)
 167 {
 168         put_device(&container_of((dev), struct hpsb_host, host_dev)->device);
 169 }
 170
 171 struct class hpsb_host_class = {
 172         .name           = "ieee1394_host",
 173         .dev_release    = host_cls_release,
 174 };
 175
 176 static void ne_cls_release(struct device *dev)
 177 {
 178         put_device(&container_of((dev), struct node_entry, node_dev)->device);
 179 }
 180
 181 static struct class nodemgr_ne_class = {
 182         .name           = "ieee1394_node",
 183         .dev_release    = ne_cls_release,
 184 };
 185
 186 static void ud_cls_release(struct device *dev)
 187 {
 188         put_device(&container_of((dev), struct unit_directory, unit_dev)->device);
 189 }
 190
 191 /* The name here is only so that unit directory hotplug works with old
 192  * style hotplug, which only ever did unit directories anyway.
 193  */
 194 static struct class nodemgr_ud_class = {
 195         .name           = "ieee1394",
 196         .dev_release    = ud_cls_release,
 197         .dev_uevent     = nodemgr_uevent,
 198 };
 199
 200 static struct hpsb_highlevel nodemgr_highlevel;
 201
 202
 203 static void nodemgr_release_ud(struct device *dev)
 204 {
 205         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 206
 207         if (ud->vendor_name_kv)
 208                 csr1212_release_keyval(ud->vendor_name_kv);
 209         if (ud->model_name_kv)
 210                 csr1212_release_keyval(ud->model_name_kv);
 211
 212         kfree(ud);
 213 }
 214
 215 static void nodemgr_release_ne(struct device *dev)
 216 {
 217         struct node_entry *ne = container_of(dev, struct node_entry, device);
 218
 219         if (ne->vendor_name_kv)
 220                 csr1212_release_keyval(ne->vendor_name_kv);
 221
 222         kfree(ne);
 223 }
 224
 225
 226 static void nodemgr_release_host(struct device *dev)
 227 {
 228         struct hpsb_host *host = container_of(dev, struct hpsb_host, device);
 229
 230         csr1212_destroy_csr(host->csr.rom);
 231
 232         kfree(host);
 233 }
 234
 235 static int nodemgr_ud_platform_data;
 236
 237 static struct device nodemgr_dev_template_ud = {
 238         .bus            = &ieee1394_bus_type,
 239         .release        = nodemgr_release_ud,
 240         .platform_data  = &nodemgr_ud_platform_data,
 241 };
 242
 243 static struct device nodemgr_dev_template_ne = {
 244         .bus            = &ieee1394_bus_type,
 245         .release        = nodemgr_release_ne,
 246 };
 247
 248 /* This dummy driver prevents the host devices from being scanned. We have no
 249  * useful drivers for them yet, and there would be a deadlock possible if the
 250  * driver core scans the host device while the host's low-level driver (i.e.
 251  * the host's parent device) is being removed. */
 252 static struct device_driver nodemgr_mid_layer_driver = {
 253         .bus            = &ieee1394_bus_type,
 254         .name           = "nodemgr",
 255         .owner          = THIS_MODULE,
 256 };
 257
 258 struct device nodemgr_dev_template_host = {
 259         .bus            = &ieee1394_bus_type,
 260         .release        = nodemgr_release_host,
 261 };
 262
 263
 264 #define fw_attr(class, class_type, field, type, format_string)          \
 265 static ssize_t fw_show_##class##_##field (struct device *dev, struct device_attribute *attr, char *buf)\
 266 {                                                                       \
 267         class_type *class;                                              \
 268         class = container_of(dev, class_type, device);                  \
 269         return sprintf(buf, format_string, (type)class->field);         \
 270 }                                                                       \
 271 static struct device_attribute dev_attr_##class##_##field = {           \
 272         .attr = {.name = __stringify(field), .mode = S_IRUGO },         \
 273         .show   = fw_show_##class##_##field,                            \
 274 };
 275
 276 #define fw_attr_td(class, class_type, td_kv)                            \
 277 static ssize_t fw_show_##class##_##td_kv (struct device *dev, struct device_attribute *attr, char *buf)\
 278 {                                                                       \
 279         int len;                                                        \
 280         class_type *class = container_of(dev, class_type, device);      \
 281         len = (class->td_kv->value.leaf.len - 2) * sizeof(quadlet_t);   \
 282         memcpy(buf,                                                     \
 283                CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(class->td_kv),      \
 284                len);                                                    \
 285         while (buf[len - 1] == '\0')                                    \
 286                 len--;                                                  \
 287         buf[len++] = '\n';                                              \
 288         buf[len] = '\0';                                                \
 289         return len;                                                     \
 290 }                                                                       \
 291 static struct device_attribute dev_attr_##class##_##td_kv = {           \
 292         .attr = {.name = __stringify(td_kv), .mode = S_IRUGO },         \
 293         .show   = fw_show_##class##_##td_kv,                            \
 294 };
 295
 296
 297 #define fw_drv_attr(field, type, format_string)                 \
 298 static ssize_t fw_drv_show_##field (struct device_driver *drv, char *buf) \
 299 {                                                               \
 300         struct hpsb_protocol_driver *driver;                    \
 301         driver = container_of(drv, struct hpsb_protocol_driver, driver); \
 302         return sprintf(buf, format_string, (type)driver->field);\
 303 }                                                               \
 304 static struct driver_attribute driver_attr_drv_##field = {      \
 305         .attr = {.name = __stringify(field), .mode = S_IRUGO }, \
 306         .show   = fw_drv_show_##field,                          \
 307 };
 308
 309
 310 static ssize_t fw_show_ne_bus_options(struct device *dev, struct device_attribute *attr, char *buf)
 311 {
 312         struct node_entry *ne = container_of(dev, struct node_entry, device);
 313
 314         return sprintf(buf, "IRMC(%d) CMC(%d) ISC(%d) BMC(%d) PMC(%d) GEN(%d) "
 315                        "LSPD(%d) MAX_REC(%d) MAX_ROM(%d) CYC_CLK_ACC(%d)\n",
 316                        ne->busopt.irmc,
 317                        ne->busopt.cmc, ne->busopt.isc, ne->busopt.bmc,
 318                        ne->busopt.pmc, ne->busopt.generation, ne->busopt.lnkspd,
 319                        ne->busopt.max_rec,
 320                        ne->busopt.max_rom,
 321                        ne->busopt.cyc_clk_acc);
 322 }
 323 static DEVICE_ATTR(bus_options,S_IRUGO,fw_show_ne_bus_options,NULL);
 324
 325
 326 #ifdef HPSB_DEBUG_TLABELS
 327 static ssize_t fw_show_ne_tlabels_free(struct device *dev,
 328                                        struct device_attribute *attr, char *buf)
 329 {
 330         struct node_entry *ne = container_of(dev, struct node_entry, device);
 331         unsigned long flags;
 332         unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
 333         int tf;
 334
 335         spin_lock_irqsave(&hpsb_tlabel_lock, flags);
 336         tf = 64 - bitmap_weight(tp, 64);
 337         spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
 338
 339         return sprintf(buf, "%d\n", tf);
 340 }
 341 static DEVICE_ATTR(tlabels_free,S_IRUGO,fw_show_ne_tlabels_free,NULL);
 342
 343
 344 static ssize_t fw_show_ne_tlabels_mask(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         u64 tm;
 351
 352         spin_lock_irqsave(&hpsb_tlabel_lock, flags);
 353 #if (BITS_PER_LONG <= 32)
 354         tm = ((u64)tp[0] << 32) + tp[1];
 355 #else
 356         tm = tp[0];
 357 #endif
 358         spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
 359
 360         return sprintf(buf, "0x%016llx\n", (unsigned long long)tm);
 361 }
 362 static DEVICE_ATTR(tlabels_mask, S_IRUGO, fw_show_ne_tlabels_mask, NULL);
 363 #endif /* HPSB_DEBUG_TLABELS */
 364
 365
 366 static ssize_t fw_set_ignore_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 367 {
 368         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 369         int state = simple_strtoul(buf, NULL, 10);
 370
 371         if (state == 1) {
 372                 ud->ignore_driver = 1;
 373                 device_release_driver(dev);
 374         } else if (state == 0)
 375                 ud->ignore_driver = 0;
 376
 377         return count;
 378 }
 379 static ssize_t fw_get_ignore_driver(struct device *dev, struct device_attribute *attr, char *buf)
 380 {
 381         struct unit_directory *ud = container_of(dev, struct unit_directory, device);
 382
 383         return sprintf(buf, "%d\n", ud->ignore_driver);
 384 }
 385 static DEVICE_ATTR(ignore_driver, S_IWUSR | S_IRUGO, fw_get_ignore_driver, fw_set_ignore_driver);
 386
 387
 388 static ssize_t fw_set_destroy_node(struct bus_type *bus, const char *buf, size_t count)
 389 {
 390         struct node_entry *ne;
 391         u64 guid = (u64)simple_strtoull(buf, NULL, 16);
 392
 393         ne = find_entry_by_guid(guid);
 394
 395         if (ne == NULL || !ne->in_limbo)
 396                 return -EINVAL;
 397
 398         nodemgr_remove_ne(ne);
 399
 400         return count;
 401 }
 402 static ssize_t fw_get_destroy_node(struct bus_type *bus, char *buf)
 403 {
 404         return sprintf(buf, "You can destroy in_limbo nodes by writing their GUID to this file\n");
 405 }
 406 static BUS_ATTR(destroy_node, S_IWUSR | S_IRUGO, fw_get_destroy_node, fw_set_destroy_node);
 407
 408
 409 static ssize_t fw_set_rescan(struct bus_type *bus, const char *buf,
 410                              size_t count)
 411 {
 412         int error = 0;
 413
 414         if (simple_strtoul(buf, NULL, 10) == 1)
 415                 error = bus_rescan_devices(&ieee1394_bus_type);
 416         return error ? error : count;
 417 }
 418 static ssize_t fw_get_rescan(struct bus_type *bus, char *buf)
 419 {
 420         return sprintf(buf, "You can force a rescan of the bus for "
 421                         "drivers by writing a 1 to this file\n");
 422 }
 423 static BUS_ATTR(rescan, S_IWUSR | S_IRUGO, fw_get_rescan, fw_set_rescan);
 424
 425
 426 static ssize_t fw_set_ignore_drivers(struct bus_type *bus, const char *buf, size_t count)
 427 {
 428         int state = simple_strtoul(buf, NULL, 10);
 429
 430         if (state == 1)
 431                 ignore_drivers = 1;
 432         else if (state == 0)
 433                 ignore_drivers = 0;
 434
 435         return count;
 436 }
 437 static ssize_t fw_get_ignore_drivers(struct bus_type *bus, char *buf)
 438 {
 439         return sprintf(buf, "%d\n", ignore_drivers);
 440 }
 441 static BUS_ATTR(ignore_drivers, S_IWUSR | S_IRUGO, fw_get_ignore_drivers, fw_set_ignore_drivers);
 442
 443
 444 struct bus_attribute *const fw_bus_attrs[] = {
 445         &bus_attr_destroy_node,
 446         &bus_attr_rescan,
 447         &bus_attr_ignore_drivers,
 448         NULL
 449 };
 450
 451
 452 fw_attr(ne, struct node_entry, capabilities, unsigned int, "0x%06x\n")
 453 fw_attr(ne, struct node_entry, nodeid, unsigned int, "0x%04x\n")
 454
 455 fw_attr(ne, struct node_entry, vendor_id, unsigned int, "0x%06x\n")
 456 fw_attr_td(ne, struct node_entry, vendor_name_kv)
 457
 458 fw_attr(ne, struct node_entry, guid, unsigned long long, "0x%016Lx\n")
 459 fw_attr(ne, struct node_entry, guid_vendor_id, unsigned int, "0x%06x\n")
 460 fw_attr(ne, struct node_entry, in_limbo, int, "%d\n");
 461
 462 static struct device_attribute *const fw_ne_attrs[] = {
 463         &dev_attr_ne_guid,
 464         &dev_attr_ne_guid_vendor_id,
 465         &dev_attr_ne_capabilities,
 466         &dev_attr_ne_vendor_id,
 467         &dev_attr_ne_nodeid,
 468         &dev_attr_bus_options,
 469 #ifdef HPSB_DEBUG_TLABELS
 470         &dev_attr_tlabels_free,
 471         &dev_attr_tlabels_mask,
 472 #endif
 473 };
 474
 475
 476
 477 fw_attr(ud, struct unit_directory, address, unsigned long long, "0x%016Lx\n")
 478 fw_attr(ud, struct unit_directory, length, int, "%d\n")
 479 /* These are all dependent on the value being provided */
 480 fw_attr(ud, struct unit_directory, vendor_id, unsigned int, "0x%06x\n")
 481 fw_attr(ud, struct unit_directory, model_id, unsigned int, "0x%06x\n")
 482 fw_attr(ud, struct unit_directory, specifier_id, unsigned int, "0x%06x\n")
 483 fw_attr(ud, struct unit_directory, version, unsigned int, "0x%06x\n")
 484 fw_attr_td(ud, struct unit_directory, vendor_name_kv)
 485 fw_attr_td(ud, struct unit_directory, model_name_kv)
 486
 487 static struct device_attribute *const fw_ud_attrs[] = {
 488         &dev_attr_ud_address,
 489         &dev_attr_ud_length,
 490         &dev_attr_ignore_driver,
 491 };
 492
 493
 494 fw_attr(host, struct hpsb_host, node_count, int, "%d\n")
 495 fw_attr(host, struct hpsb_host, selfid_count, int, "%d\n")
 496 fw_attr(host, struct hpsb_host, nodes_active, int, "%d\n")
 497 fw_attr(host, struct hpsb_host, in_bus_reset, int, "%d\n")
 498 fw_attr(host, struct hpsb_host, is_root, int, "%d\n")
 499 fw_attr(host, struct hpsb_host, is_cycmst, int, "%d\n")
 500 fw_attr(host, struct hpsb_host, is_irm, int, "%d\n")
 501 fw_attr(host, struct hpsb_host, is_busmgr, int, "%d\n")
 502
 503 static struct device_attribute *const fw_host_attrs[] = {
 504         &dev_attr_host_node_count,
 505         &dev_attr_host_selfid_count,
 506         &dev_attr_host_nodes_active,
 507         &dev_attr_host_in_bus_reset,
 508         &dev_attr_host_is_root,
 509         &dev_attr_host_is_cycmst,
 510         &dev_attr_host_is_irm,
 511         &dev_attr_host_is_busmgr,
 512 };
 513
 514
 515 static ssize_t fw_show_drv_device_ids(struct device_driver *drv, char *buf)
 516 {
 517         struct hpsb_protocol_driver *driver;
 518         struct ieee1394_device_id *id;
 519         int length = 0;
 520         char *scratch = buf;
 521
 522         driver = container_of(drv, struct hpsb_protocol_driver, driver);
 523
 524         for (id = driver->id_table; id->match_flags != 0; id++) {
 525                 int need_coma = 0;
 526
 527                 if (id->match_flags & IEEE1394_MATCH_VENDOR_ID) {
 528                         length += sprintf(scratch, "vendor_id=0x%06x", id->vendor_id);
 529                         scratch = buf + length;
 530                         need_coma++;
 531                 }
 532
 533                 if (id->match_flags & IEEE1394_MATCH_MODEL_ID) {
 534                         length += sprintf(scratch, "%smodel_id=0x%06x",
 535                                           need_coma++ ? "," : "",
 536                                           id->model_id);
 537                         scratch = buf + length;
 538                 }
 539
 540                 if (id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) {
 541                         length += sprintf(scratch, "%sspecifier_id=0x%06x",
 542                                           need_coma++ ? "," : "",
 543                                           id->specifier_id);
 544                         scratch = buf + length;
 545                 }
 546
 547                 if (id->match_flags & IEEE1394_MATCH_VERSION) {
 548                         length += sprintf(scratch, "%sversion=0x%06x",
 549                                           need_coma++ ? "," : "",
 550                                           id->version);
 551                         scratch = buf + length;
 552                 }
 553
 554                 if (need_coma) {
 555                         *scratch++ = '\n';
 556                         length++;
 557                 }
 558         }
 559
 560         return length;
 561 }
 562 static DRIVER_ATTR(device_ids,S_IRUGO,fw_show_drv_device_ids,NULL);
 563
 564
 565 fw_drv_attr(name, const char *, "%s\n")
 566
 567 static struct driver_attribute *const fw_drv_attrs[] = {
 568         &driver_attr_drv_name,
 569         &driver_attr_device_ids,
 570 };
 571
 572
 573 static void nodemgr_create_drv_files(struct hpsb_protocol_driver *driver)
 574 {
 575         struct device_driver *drv = &driver->driver;
 576         int i;
 577
 578         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
 579                 if (driver_create_file(drv, fw_drv_attrs[i]))
 580                         goto fail;
 581         return;
 582 fail:
 583         HPSB_ERR("Failed to add sysfs attribute");
 584 }
 585
 586
 587 static void nodemgr_remove_drv_files(struct hpsb_protocol_driver *driver)
 588 {
 589         struct device_driver *drv = &driver->driver;
 590         int i;
 591
 592         for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
 593                 driver_remove_file(drv, fw_drv_attrs[i]);
 594 }
 595
 596
 597 static void nodemgr_create_ne_dev_files(struct node_entry *ne)
 598 {
 599         struct device *dev = &ne->device;
 600         int i;
 601
 602         for (i = 0; i < ARRAY_SIZE(fw_ne_attrs); i++)
 603                 if (device_create_file(dev, fw_ne_attrs[i]))
 604                         goto fail;
 605         return;
 606 fail:
 607         HPSB_ERR("Failed to add sysfs attribute");
 608 }
 609
 610
 611 static void nodemgr_create_host_dev_files(struct hpsb_host *host)
 612 {
 613         struct device *dev = &host->device;
 614         int i;
 615
 616         for (i = 0; i < ARRAY_SIZE(fw_host_attrs); i++)
 617                 if (device_create_file(dev, fw_host_attrs[i]))
 618                         goto fail;
 619         return;
 620 fail:
 621         HPSB_ERR("Failed to add sysfs attribute");
 622 }
 623
 624
 625 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
 626                                                nodeid_t nodeid);
 627
 628 static void nodemgr_update_host_dev_links(struct hpsb_host *host)
 629 {
 630         struct device *dev = &host->device;
 631         struct node_entry *ne;
 632
 633         sysfs_remove_link(&dev->kobj, "irm_id");
 634         sysfs_remove_link(&dev->kobj, "busmgr_id");
 635         sysfs_remove_link(&dev->kobj, "host_id");
 636
 637         if ((ne = find_entry_by_nodeid(host, host->irm_id)) &&
 638             sysfs_create_link(&dev->kobj, &ne->device.kobj, "irm_id"))
 639                 goto fail;
 640         if ((ne = find_entry_by_nodeid(host, host->busmgr_id)) &&
 641             sysfs_create_link(&dev->kobj, &ne->device.kobj, "busmgr_id"))
 642                 goto fail;
 643         if ((ne = find_entry_by_nodeid(host, host->node_id)) &&
 644             sysfs_create_link(&dev->kobj, &ne->device.kobj, "host_id"))
 645                 goto fail;
 646         return;
 647 fail:
 648         HPSB_ERR("Failed to update sysfs attributes for host %d", host->id);
 649 }
 650
 651 static void nodemgr_create_ud_dev_files(struct unit_directory *ud)
 652 {
 653         struct device *dev = &ud->device;
 654         int i;
 655
 656         for (i = 0; i < ARRAY_SIZE(fw_ud_attrs); i++)
 657                 if (device_create_file(dev, fw_ud_attrs[i]))
 658                         goto fail;
 659         if (ud->flags & UNIT_DIRECTORY_SPECIFIER_ID)
 660                 if (device_create_file(dev, &dev_attr_ud_specifier_id))
 661                         goto fail;
 662         if (ud->flags & UNIT_DIRECTORY_VERSION)
 663                 if (device_create_file(dev, &dev_attr_ud_version))
 664                         goto fail;
 665         if (ud->flags & UNIT_DIRECTORY_VENDOR_ID) {
 666                 if (device_create_file(dev, &dev_attr_ud_vendor_id))
 667                         goto fail;
 668                 if (ud->vendor_name_kv &&
 669                     device_create_file(dev, &dev_attr_ud_vendor_name_kv))
 670                         goto fail;
 671         }
 672         if (ud->flags & UNIT_DIRECTORY_MODEL_ID) {
 673                 if (device_create_file(dev, &dev_attr_ud_model_id))
 674                         goto fail;
 675                 if (ud->model_name_kv &&
 676                     device_create_file(dev, &dev_attr_ud_model_name_kv))
 677                         goto fail;
 678         }
 679         return;
 680 fail:
 681         HPSB_ERR("Failed to add sysfs attribute");
 682 }
 683
 684
 685 static int nodemgr_bus_match(struct device * dev, struct device_driver * drv)
 686 {
 687         struct hpsb_protocol_driver *driver;
 688         struct unit_directory *ud;
 689         struct ieee1394_device_id *id;
 690
 691         /* We only match unit directories */
 692         if (dev->platform_data != &nodemgr_ud_platform_data)
 693                 return 0;
 694
 695         ud = container_of(dev, struct unit_directory, device);
 696         if (ud->ne->in_limbo || ud->ignore_driver)
 697                 return 0;
 698
 699         /* We only match drivers of type hpsb_protocol_driver */
 700         if (drv == &nodemgr_mid_layer_driver)
 701                 return 0;
 702
 703         driver = container_of(drv, struct hpsb_protocol_driver, driver);
 704         for (id = driver->id_table; id->match_flags != 0; id++) {
 705                 if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) &&
 706                     id->vendor_id != ud->vendor_id)
 707                         continue;
 708
 709                 if ((id->match_flags & IEEE1394_MATCH_MODEL_ID) &&
 710                     id->model_id != ud->model_id)
 711                         continue;
 712
 713                 if ((id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) &&
 714                     id->specifier_id != ud->specifier_id)
 715                         continue;
 716
 717                 if ((id->match_flags & IEEE1394_MATCH_VERSION) &&
 718                     id->version != ud->version)
 719                         continue;
 720
 721                 return 1;
 722         }
 723
 724         return 0;
 725 }
 726
 727
 728 static DEFINE_MUTEX(nodemgr_serialize_remove_uds);
 729
 730 static int __match_ne(struct device *dev, void *data)
 731 {
 732         struct unit_directory *ud;
 733         struct node_entry *ne = (struct node_entry *)data;
 734
 735         ud = container_of(dev, struct unit_directory, unit_dev);
 736         return ud->ne == ne;
 737 }
 738
 739 static void nodemgr_remove_uds(struct node_entry *ne)
 740 {
 741         struct device *dev;
 742         struct unit_directory *ud;
 743
 744         /* Use class_find device to iterate the devices. Since this code
 745          * may be called from other contexts besides the knodemgrds,
 746          * protect it by nodemgr_serialize_remove_uds.
 747          */
 748         mutex_lock(&nodemgr_serialize_remove_uds);
 749         for (;;) {
 750                 dev = class_find_device(&nodemgr_ud_class, ne, __match_ne);
 751                 if (!dev)
 752                         break;
 753                 ud = container_of(dev, struct unit_directory, unit_dev);
 754                 put_device(dev);
 755                 device_unregister(&ud->unit_dev);
 756                 device_unregister(&ud->device);
 757         }
 758         mutex_unlock(&nodemgr_serialize_remove_uds);
 759 }
 760
 761
 762 static void nodemgr_remove_ne(struct node_entry *ne)
 763 {
 764         struct device *dev;
 765
 766         dev = get_device(&ne->device);
 767         if (!dev)
 768                 return;
 769
 770         HPSB_DEBUG("Node removed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 771                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
 772         nodemgr_remove_uds(ne);
 773
 774         device_unregister(&ne->node_dev);
 775         device_unregister(dev);
 776
 777         put_device(dev);
 778 }
 779
 780 static int __nodemgr_remove_host_dev(struct device *dev, void *data)
 781 {
 782         if (dev->bus == &ieee1394_bus_type)
 783                 nodemgr_remove_ne(container_of(dev, struct node_entry,
 784                                   device));
 785         return 0;
 786 }
 787
 788 static void nodemgr_remove_host_dev(struct device *dev)
 789 {
 790         WARN_ON(device_for_each_child(dev, NULL, __nodemgr_remove_host_dev));
 791         sysfs_remove_link(&dev->kobj, "irm_id");
 792         sysfs_remove_link(&dev->kobj, "busmgr_id");
 793         sysfs_remove_link(&dev->kobj, "host_id");
 794 }
 795
 796
 797 static void nodemgr_update_bus_options(struct node_entry *ne)
 798 {
 799 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
 800         static const u16 mr[] = { 4, 64, 1024, 0};
 801 #endif
 802         quadlet_t busoptions = be32_to_cpu(ne->csr->bus_info_data[2]);
 803
 804         ne->busopt.irmc         = (busoptions >> 31) & 1;
 805         ne->busopt.cmc          = (busoptions >> 30) & 1;
 806         ne->busopt.isc          = (busoptions >> 29) & 1;
 807         ne->busopt.bmc          = (busoptions >> 28) & 1;
 808         ne->busopt.pmc          = (busoptions >> 27) & 1;
 809         ne->busopt.cyc_clk_acc  = (busoptions >> 16) & 0xff;
 810         ne->busopt.max_rec      = 1 << (((busoptions >> 12) & 0xf) + 1);
 811         ne->busopt.max_rom      = (busoptions >> 8) & 0x3;
 812         ne->busopt.generation   = (busoptions >> 4) & 0xf;
 813         ne->busopt.lnkspd       = busoptions & 0x7;
 814
 815         HPSB_VERBOSE("NodeMgr: raw=0x%08x irmc=%d cmc=%d isc=%d bmc=%d pmc=%d "
 816                      "cyc_clk_acc=%d max_rec=%d max_rom=%d gen=%d lspd=%d",
 817                      busoptions, ne->busopt.irmc, ne->busopt.cmc,
 818                      ne->busopt.isc, ne->busopt.bmc, ne->busopt.pmc,
 819                      ne->busopt.cyc_clk_acc, ne->busopt.max_rec,
 820                      mr[ne->busopt.max_rom],
 821                      ne->busopt.generation, ne->busopt.lnkspd);
 822 }
 823
 824
 825 static struct node_entry *nodemgr_create_node(octlet_t guid, struct csr1212_csr *csr,
 826                                               struct host_info *hi, nodeid_t nodeid,
 827                                               unsigned int generation)
 828 {
 829         struct hpsb_host *host = hi->host;
 830         struct node_entry *ne;
 831
 832         ne = kzalloc(sizeof(*ne), GFP_KERNEL);
 833         if (!ne)
 834                 goto fail_alloc;
 835
 836         ne->host = host;
 837         ne->nodeid = nodeid;
 838         ne->generation = generation;
 839         ne->needs_probe = 1;
 840
 841         ne->guid = guid;
 842         ne->guid_vendor_id = (guid >> 40) & 0xffffff;
 843         ne->csr = csr;
 844
 845         memcpy(&ne->device, &nodemgr_dev_template_ne,
 846                sizeof(ne->device));
 847         ne->device.parent = &host->device;
 848         snprintf(ne->device.bus_id, BUS_ID_SIZE, "%016Lx",
 849                  (unsigned long long)(ne->guid));
 850
 851         ne->node_dev.parent = &ne->device;
 852         ne->node_dev.class = &nodemgr_ne_class;
 853         snprintf(ne->node_dev.bus_id, BUS_ID_SIZE, "%016Lx",
 854                 (unsigned long long)(ne->guid));
 855
 856         if (device_register(&ne->device))
 857                 goto fail_devreg;
 858         if (device_register(&ne->node_dev))
 859                 goto fail_classdevreg;
 860         get_device(&ne->device);
 861
 862         nodemgr_create_ne_dev_files(ne);
 863
 864         nodemgr_update_bus_options(ne);
 865
 866         HPSB_DEBUG("%s added: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 867                    (host->node_id == nodeid) ? "Host" : "Node",
 868                    NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
 869
 870         return ne;
 871
 872 fail_classdevreg:
 873         device_unregister(&ne->device);
 874 fail_devreg:
 875         kfree(ne);
 876 fail_alloc:
 877         HPSB_ERR("Failed to create node ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
 878                  NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
 879
 880         return NULL;
 881 }
 882
 883 static int __match_ne_guid(struct device *dev, void *data)
 884 {
 885         struct node_entry *ne;
 886         u64 *guid = (u64 *)data;
 887
 888         ne = container_of(dev, struct node_entry, node_dev);
 889         return ne->guid == *guid;
 890 }
 891
 892 static struct node_entry *find_entry_by_guid(u64 guid)
 893 {
 894         struct device *dev;
 895         struct node_entry *ne;
 896
 897         dev = class_find_device(&nodemgr_ne_class, &guid, __match_ne_guid);
 898         if (!dev)
 899                 return NULL;
 900         ne = container_of(dev, struct node_entry, node_dev);
 901         put_device(dev);
 902
 903         return ne;
 904 }
 905
 906 struct match_nodeid_param {
 907         struct hpsb_host *host;
 908         nodeid_t nodeid;
 909 };
 910
 911 static int __match_ne_nodeid(struct device *dev, void *data)
 912 {
 913         int found = 0;
 914         struct node_entry *ne;
 915         struct match_nodeid_param *param = (struct match_nodeid_param *)data;
 916
 917         if (!dev)
 918                 goto ret;
 919         ne = container_of(dev, struct node_entry, node_dev);
 920         if (ne->host == param->host && ne->nodeid == param->nodeid)
 921                 found = 1;
 922 ret:
 923         return found;
 924 }
 925
 926 static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
 927                                                nodeid_t nodeid)
 928 {
 929         struct device *dev;
 930         struct node_entry *ne;
 931         struct match_nodeid_param param;
 932
 933         param.host = host;
 934         param.nodeid = nodeid;
 935
 936         dev = class_find_device(&nodemgr_ne_class, &param, __match_ne_nodeid);
 937         if (!dev)
 938                 return NULL;
 939         ne = container_of(dev, struct node_entry, node_dev);
 940         put_device(dev);
 941
 942         return ne;
 943 }
 944
 945
 946 static void nodemgr_register_device(struct node_entry *ne,
 947         struct unit_directory *ud, struct device *parent)
 948 {
 949         memcpy(&ud->device, &nodemgr_dev_template_ud,
 950                sizeof(ud->device));
 951
 952         ud->device.parent = parent;
 953
 954         snprintf(ud->device.bus_id, BUS_ID_SIZE, "%s-%u",
 955                  ne->device.bus_id, ud->id);
 956
 957         ud->unit_dev.parent = &ud->device;
 958         ud->unit_dev.class = &nodemgr_ud_class;
 959         snprintf(ud->unit_dev.bus_id, BUS_ID_SIZE, "%s-%u",
 960                  ne->device.bus_id, ud->id);
 961
 962         if (device_register(&ud->device))
 963                 goto fail_devreg;
 964         if (device_register(&ud->unit_dev))
 965                 goto fail_classdevreg;
 966         get_device(&ud->device);
 967
 968         nodemgr_create_ud_dev_files(ud);
 969
 970         return;
 971
 972 fail_classdevreg:
 973         device_unregister(&ud->device);
 974 fail_devreg:
 975         HPSB_ERR("Failed to create unit %s", ud->device.bus_id);
 976 }
 977
 978
 979 /* This implementation currently only scans the config rom and its
 980  * immediate unit directories looking for software_id and
 981  * software_version entries, in order to get driver autoloading working. */
 982 static struct unit_directory *nodemgr_process_unit_directory
 983         (struct host_info *hi, struct node_entry *ne, struct csr1212_keyval *ud_kv,
 984          unsigned int *id, struct unit_directory *parent)
 985 {
 986         struct unit_directory *ud;
 987         struct unit_directory *ud_child = NULL;
 988         struct csr1212_dentry *dentry;
 989         struct csr1212_keyval *kv;
 990         u8 last_key_id = 0;
 991
 992         ud = kzalloc(sizeof(*ud), GFP_KERNEL);
 993         if (!ud)
 994                 goto unit_directory_error;
 995
 996         ud->ne = ne;
 997         ud->ignore_driver = ignore_drivers;
 998         ud->address = ud_kv->offset + CSR1212_REGISTER_SPACE_BASE;
 999         ud->directory_id = ud->address & 0xffffff;
1000         ud->ud_kv = ud_kv;
1001         ud->id = (*id)++;
1002
1003         csr1212_for_each_dir_entry(ne->csr, kv, ud_kv, dentry) {
1004                 switch (kv->key.id) {
1005                 case CSR1212_KV_ID_VENDOR:
1006                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
1007                                 ud->vendor_id = kv->value.immediate;
1008                                 ud->flags |= UNIT_DIRECTORY_VENDOR_ID;
1009                         }
1010                         break;
1011
1012                 case CSR1212_KV_ID_MODEL:
1013                         ud->model_id = kv->value.immediate;
1014                         ud->flags |= UNIT_DIRECTORY_MODEL_ID;
1015                         break;
1016
1017                 case CSR1212_KV_ID_SPECIFIER_ID:
1018                         ud->specifier_id = kv->value.immediate;
1019                         ud->flags |= UNIT_DIRECTORY_SPECIFIER_ID;
1020                         break;
1021
1022                 case CSR1212_KV_ID_VERSION:
1023                         ud->version = kv->value.immediate;
1024                         ud->flags |= UNIT_DIRECTORY_VERSION;
1025                         break;
1026
1027                 case CSR1212_KV_ID_DESCRIPTOR:
1028                         if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1029                             CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1030                             CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1031                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1032                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1033                             CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1034                                 switch (last_key_id) {
1035                                 case CSR1212_KV_ID_VENDOR:
1036                                         csr1212_keep_keyval(kv);
1037                                         ud->vendor_name_kv = kv;
1038                                         break;
1039
1040                                 case CSR1212_KV_ID_MODEL:
1041                                         csr1212_keep_keyval(kv);
1042                                         ud->model_name_kv = kv;
1043                                         break;
1044
1045                                 }
1046                         } /* else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) ... */
1047                         break;
1048
1049                 case CSR1212_KV_ID_DEPENDENT_INFO:
1050                         /* Logical Unit Number */
1051                         if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
1052                                 if (ud->flags & UNIT_DIRECTORY_HAS_LUN) {
1053                                         ud_child = kmemdup(ud, sizeof(*ud_child), GFP_KERNEL);
1054                                         if (!ud_child)
1055                                                 goto unit_directory_error;
1056                                         nodemgr_register_device(ne, ud_child, &ne->device);
1057                                         ud_child = NULL;
1058
1059                                         ud->id = (*id)++;
1060                                 }
1061                                 ud->lun = kv->value.immediate;
1062                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN;
1063
1064                         /* Logical Unit Directory */
1065                         } else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) {
1066                                 /* This should really be done in SBP2 as this is
1067                                  * doing SBP2 specific parsing.
1068                                  */
1069
1070                                 /* first register the parent unit */
1071                                 ud->flags |= UNIT_DIRECTORY_HAS_LUN_DIRECTORY;
1072                                 if (ud->device.bus != &ieee1394_bus_type)
1073                                         nodemgr_register_device(ne, ud, &ne->device);
1074
1075                                 /* process the child unit */
1076                                 ud_child = nodemgr_process_unit_directory(hi, ne, kv, id, ud);
1077
1078                                 if (ud_child == NULL)
1079                                         break;
1080
1081                                 /* inherit unspecified values, the driver core picks it up */
1082                                 if ((ud->flags & UNIT_DIRECTORY_MODEL_ID) &&
1083                                     !(ud_child->flags & UNIT_DIRECTORY_MODEL_ID))
1084                                 {
1085                                         ud_child->flags |=  UNIT_DIRECTORY_MODEL_ID;
1086                                         ud_child->model_id = ud->model_id;
1087                                 }
1088                                 if ((ud->flags & UNIT_DIRECTORY_SPECIFIER_ID) &&
1089                                     !(ud_child->flags & UNIT_DIRECTORY_SPECIFIER_ID))
1090                                 {
1091                                         ud_child->flags |=  UNIT_DIRECTORY_SPECIFIER_ID;
1092                                         ud_child->specifier_id = ud->specifier_id;
1093                                 }
1094                                 if ((ud->flags & UNIT_DIRECTORY_VERSION) &&
1095                                     !(ud_child->flags & UNIT_DIRECTORY_VERSION))
1096                                 {
1097                                         ud_child->flags |=  UNIT_DIRECTORY_VERSION;
1098                                         ud_child->version = ud->version;
1099                                 }
1100
1101                                 /* register the child unit */
1102                                 ud_child->flags |= UNIT_DIRECTORY_LUN_DIRECTORY;
1103                                 nodemgr_register_device(ne, ud_child, &ud->device);
1104                         }
1105
1106                         break;
1107
1108                 case CSR1212_KV_ID_DIRECTORY_ID:
1109                         ud->directory_id = kv->value.immediate;
1110                         break;
1111
1112                 default:
1113                         break;
1114                 }
1115                 last_key_id = kv->key.id;
1116         }
1117
1118         /* do not process child units here and only if not already registered */
1119         if (!parent && ud->device.bus != &ieee1394_bus_type)
1120                 nodemgr_register_device(ne, ud, &ne->device);
1121
1122         return ud;
1123
1124 unit_directory_error:
1125         kfree(ud);
1126         return NULL;
1127 }
1128
1129
1130 static void nodemgr_process_root_directory(struct host_info *hi, struct node_entry *ne)
1131 {
1132         unsigned int ud_id = 0;
1133         struct csr1212_dentry *dentry;
1134         struct csr1212_keyval *kv, *vendor_name_kv = NULL;
1135         u8 last_key_id = 0;
1136
1137         ne->needs_probe = 0;
1138
1139         csr1212_for_each_dir_entry(ne->csr, kv, ne->csr->root_kv, dentry) {
1140                 switch (kv->key.id) {
1141                 case CSR1212_KV_ID_VENDOR:
1142                         ne->vendor_id = kv->value.immediate;
1143                         break;
1144
1145                 case CSR1212_KV_ID_NODE_CAPABILITIES:
1146                         ne->capabilities = kv->value.immediate;
1147                         break;
1148
1149                 case CSR1212_KV_ID_UNIT:
1150                         nodemgr_process_unit_directory(hi, ne, kv, &ud_id, NULL);
1151                         break;
1152
1153                 case CSR1212_KV_ID_DESCRIPTOR:
1154                         if (last_key_id == CSR1212_KV_ID_VENDOR) {
1155                                 if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1156                                     CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1157                                     CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1158                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1159                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1160                                     CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1161                                         csr1212_keep_keyval(kv);
1162                                         vendor_name_kv = kv;
1163                                 }
1164                         }
1165                         break;
1166                 }
1167                 last_key_id = kv->key.id;
1168         }
1169
1170         if (ne->vendor_name_kv) {
1171                 kv = ne->vendor_name_kv;
1172                 ne->vendor_name_kv = vendor_name_kv;
1173                 csr1212_release_keyval(kv);
1174         } else if (vendor_name_kv) {
1175                 ne->vendor_name_kv = vendor_name_kv;
1176                 if (device_create_file(&ne->device,
1177                                        &dev_attr_ne_vendor_name_kv) != 0)
1178                         HPSB_ERR("Failed to add sysfs attribute");
1179         }
1180 }
1181
1182 #ifdef CONFIG_HOTPLUG
1183
1184 static int nodemgr_uevent(struct device *dev, struct kobj_uevent_env *env)
1185 {
1186         struct unit_directory *ud;
1187         int retval = 0;
1188         /* ieee1394:venNmoNspNverN */
1189         char buf[8 + 1 + 3 + 8 + 2 + 8 + 2 + 8 + 3 + 8 + 1];
1190
1191         if (!dev)
1192                 return -ENODEV;
1193
1194         ud = container_of(dev, struct unit_directory, unit_dev);
1195
1196         if (ud->ne->in_limbo || ud->ignore_driver)
1197                 return -ENODEV;
1198
1199 #define PUT_ENVP(fmt,val)                                       \
1200 do {                                                            \
1201         retval = add_uevent_var(env, fmt, val);         \
1202         if (retval)                                             \
1203                 return retval;                                  \
1204 } while (0)
1205
1206         PUT_ENVP("VENDOR_ID=%06x", ud->vendor_id);
1207         PUT_ENVP("MODEL_ID=%06x", ud->model_id);
1208         PUT_ENVP("GUID=%016Lx", (unsigned long long)ud->ne->guid);
1209         PUT_ENVP("SPECIFIER_ID=%06x", ud->specifier_id);
1210         PUT_ENVP("VERSION=%06x", ud->version);
1211         snprintf(buf, sizeof(buf), "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
1212                         ud->vendor_id,
1213                         ud->model_id,
1214                         ud->specifier_id,
1215                         ud->version);
1216         PUT_ENVP("MODALIAS=%s", buf);
1217
1218 #undef PUT_ENVP
1219
1220         return 0;
1221 }
1222
1223 #else
1224
1225 static int nodemgr_uevent(struct device *dev, struct kobj_uevent_env *env)
1226 {
1227         return -ENODEV;
1228 }
1229
1230 #endif /* CONFIG_HOTPLUG */
1231
1232
1233 int __hpsb_register_protocol(struct hpsb_protocol_driver *drv,
1234                              struct module *owner)
1235 {
1236         int error;
1237
1238         drv->driver.bus = &ieee1394_bus_type;
1239         drv->driver.owner = owner;
1240         drv->driver.name = drv->name;
1241
1242         /* This will cause a probe for devices */
1243         error = driver_register(&drv->driver);
1244         if (!error)
1245                 nodemgr_create_drv_files(drv);
1246         return error;
1247 }
1248
1249 void hpsb_unregister_protocol(struct hpsb_protocol_driver *driver)
1250 {
1251         nodemgr_remove_drv_files(driver);
1252         /* This will subsequently disconnect all devices that our driver
1253          * is attached to. */
1254         driver_unregister(&driver->driver);
1255 }
1256
1257
1258 /*
1259  * This function updates nodes that were present on the bus before the
1260  * reset and still are after the reset.  The nodeid and the config rom
1261  * may have changed, and the drivers managing this device must be
1262  * informed that this device just went through a bus reset, to allow
1263  * the to take whatever actions required.
1264  */
1265 static void nodemgr_update_node(struct node_entry *ne, struct csr1212_csr *csr,
1266                                 struct host_info *hi, nodeid_t nodeid,
1267                                 unsigned int generation)
1268 {
1269         if (ne->nodeid != nodeid) {
1270                 HPSB_DEBUG("Node changed: " NODE_BUS_FMT " -> " NODE_BUS_FMT,
1271                            NODE_BUS_ARGS(ne->host, ne->nodeid),
1272                            NODE_BUS_ARGS(ne->host, nodeid));
1273                 ne->nodeid = nodeid;
1274         }
1275
1276         if (ne->busopt.generation != ((be32_to_cpu(csr->bus_info_data[2]) >> 4) & 0xf)) {
1277                 kfree(ne->csr->private);
1278                 csr1212_destroy_csr(ne->csr);
1279                 ne->csr = csr;
1280
1281                 /* If the node's configrom generation has changed, we
1282                  * unregister all the unit directories. */
1283                 nodemgr_remove_uds(ne);
1284
1285                 nodemgr_update_bus_options(ne);
1286
1287                 /* Mark the node as new, so it gets re-probed */
1288                 ne->needs_probe = 1;
1289         } else {
1290                 /* old cache is valid, so update its generation */
1291                 struct nodemgr_csr_info *ci = ne->csr->private;
1292                 ci->generation = generation;
1293                 /* free the partially filled now unneeded new cache */
1294                 kfree(csr->private);
1295                 csr1212_destroy_csr(csr);
1296         }
1297
1298         if (ne->in_limbo)
1299                 nodemgr_resume_ne(ne);
1300
1301         /* Mark the node current */
1302         ne->generation = generation;
1303 }
1304
1305
1306
1307 static void nodemgr_node_scan_one(struct host_info *hi,
1308                                   nodeid_t nodeid, int generation)
1309 {
1310         struct hpsb_host *host = hi->host;
1311         struct node_entry *ne;
1312         octlet_t guid;
1313         struct csr1212_csr *csr;
1314         struct nodemgr_csr_info *ci;
1315         u8 *speed;
1316
1317         ci = kmalloc(sizeof(*ci), GFP_KERNEL);
1318         if (!ci)
1319                 return;
1320
1321         ci->host = host;
1322         ci->nodeid = nodeid;
1323         ci->generation = generation;
1324
1325         /* Prepare for speed probe which occurs when reading the ROM */
1326         speed = &(host->speed[NODEID_TO_NODE(nodeid)]);
1327         if (*speed > host->csr.lnk_spd)
1328                 *speed = host->csr.lnk_spd;
1329         ci->speed_unverified = *speed > IEEE1394_SPEED_100;
1330
1331         /* We need to detect when the ConfigROM's generation has changed,
1332          * so we only update the node's info when it needs to be.  */
1333
1334         csr = csr1212_create_csr(&nodemgr_csr_ops, 5 * sizeof(quadlet_t), ci);
1335         if (!csr || csr1212_parse_csr(csr) != CSR1212_SUCCESS) {
1336                 HPSB_ERR("Error parsing configrom for node " NODE_BUS_FMT,
1337                          NODE_BUS_ARGS(host, nodeid));
1338                 if (csr)
1339                         csr1212_destroy_csr(csr);
1340                 kfree(ci);
1341                 return;
1342         }
1343
1344         if (csr->bus_info_data[1] != IEEE1394_BUSID_MAGIC) {
1345                 /* This isn't a 1394 device, but we let it slide. There
1346                  * was a report of a device with broken firmware which
1347                  * reported '2394' instead of '1394', which is obviously a
1348                  * mistake. One would hope that a non-1394 device never
1349                  * gets connected to Firewire bus. If someone does, we
1350                  * shouldn't be held responsible, so we'll allow it with a
1351                  * warning.  */
1352                 HPSB_WARN("Node " NODE_BUS_FMT " has invalid busID magic [0x%08x]",
1353                           NODE_BUS_ARGS(host, nodeid), csr->bus_info_data[1]);
1354         }
1355
1356         guid = ((u64)be32_to_cpu(csr->bus_info_data[3]) << 32) | be32_to_cpu(csr->bus_info_data[4]);
1357         ne = find_entry_by_guid(guid);
1358
1359         if (ne && ne->host != host && ne->in_limbo) {
1360                 /* Must have moved this device from one host to another */
1361                 nodemgr_remove_ne(ne);
1362                 ne = NULL;
1363         }
1364
1365         if (!ne)
1366                 nodemgr_create_node(guid, csr, hi, nodeid, generation);
1367         else
1368                 nodemgr_update_node(ne, csr, hi, nodeid, generation);
1369 }
1370
1371
1372 static void nodemgr_node_scan(struct host_info *hi, int generation)
1373 {
1374         int count;
1375         struct hpsb_host *host = hi->host;
1376         struct selfid *sid = (struct selfid *)host->topology_map;
1377         nodeid_t nodeid = LOCAL_BUS;
1378
1379         /* Scan each node on the bus */
1380         for (count = host->selfid_count; count; count--, sid++) {
1381                 if (sid->extended)
1382                         continue;
1383
1384                 if (!sid->link_active) {
1385                         nodeid++;
1386                         continue;
1387                 }
1388                 nodemgr_node_scan_one(hi, nodeid++, generation);
1389         }
1390 }
1391
1392 static int __nodemgr_driver_suspend(struct device *dev, void *data)
1393 {
1394         struct unit_directory *ud;
1395         struct device_driver *drv;
1396         struct node_entry *ne = (struct node_entry *)data;
1397         int error;
1398
1399         ud = container_of(dev, struct unit_directory, unit_dev);
1400         if (ud->ne == ne) {
1401                 drv = get_driver(ud->device.driver);
1402                 if (drv) {
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         }
1414
1415         return 0;
1416 }
1417
1418 static int __nodemgr_driver_resume(struct device *dev, void *data)
1419 {
1420         struct unit_directory *ud;
1421         struct device_driver *drv;
1422         struct node_entry *ne = (struct node_entry *)data;
1423
1424         ud = container_of(dev, struct unit_directory, unit_dev);
1425         if (ud->ne == ne) {
1426                 drv = get_driver(ud->device.driver);
1427                 if (drv) {
1428                         if (drv->resume) {
1429                                 down(&ud->device.sem);
1430                                 drv->resume(&ud->device);
1431                                 up(&ud->device.sem);
1432                         }
1433                         put_driver(drv);
1434                 }
1435         }
1436
1437         return 0;
1438 }
1439
1440 static void nodemgr_suspend_ne(struct node_entry *ne)
1441 {
1442         HPSB_DEBUG("Node suspended: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1443                    NODE_BUS_ARGS(ne->host, ne->nodeid),
1444                    (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         class_for_each_device(&nodemgr_ud_class, ne, __nodemgr_driver_suspend);
1450 }
1451
1452
1453 static void nodemgr_resume_ne(struct node_entry *ne)
1454 {
1455         ne->in_limbo = 0;
1456         device_remove_file(&ne->device, &dev_attr_ne_in_limbo);
1457
1458         class_for_each_device(&nodemgr_ud_class, ne, __nodemgr_driver_resume);
1459         HPSB_DEBUG("Node resumed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1460                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1461 }
1462
1463 static int __nodemgr_update_pdrv(struct device *dev, void *data)
1464 {
1465         struct unit_directory *ud;
1466         struct device_driver *drv;
1467         struct hpsb_protocol_driver *pdrv;
1468         struct node_entry *ne = (struct node_entry *)data;
1469         int error;
1470
1471         ud = container_of(dev, struct unit_directory, unit_dev);
1472         if (ud->ne == ne) {
1473                 drv = get_driver(ud->device.driver);
1474                 if (drv) {
1475                         error = 0;
1476                         pdrv = container_of(drv, struct hpsb_protocol_driver,
1477                                             driver);
1478                         if (pdrv->update) {
1479                                 down(&ud->device.sem);
1480                                 error = pdrv->update(ud);
1481                                 up(&ud->device.sem);
1482                         }
1483                         if (error)
1484                                 device_release_driver(&ud->device);
1485                         put_driver(drv);
1486                 }
1487         }
1488
1489         return 0;
1490 }
1491
1492 static void nodemgr_update_pdrv(struct node_entry *ne)
1493 {
1494         class_for_each_device(&nodemgr_ud_class, ne, __nodemgr_update_pdrv);
1495 }
1496
1497
1498 /* Write the BROADCAST_CHANNEL as per IEEE1394a 8.3.2.3.11 and 8.4.2.3.  This
1499  * seems like an optional service but in the end it is practically mandatory
1500  * as a consequence of these clauses.
1501  *
1502  * Note that we cannot do a broadcast write to all nodes at once because some
1503  * pre-1394a devices would hang. */
1504 static void nodemgr_irm_write_bc(struct node_entry *ne, int generation)
1505 {
1506         const u64 bc_addr = (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL);
1507         quadlet_t bc_remote, bc_local;
1508         int error;
1509
1510         if (!ne->host->is_irm || ne->generation != generation ||
1511             ne->nodeid == ne->host->node_id)
1512                 return;
1513
1514         bc_local = cpu_to_be32(ne->host->csr.broadcast_channel);
1515
1516         /* Check if the register is implemented and 1394a compliant. */
1517         error = hpsb_read(ne->host, ne->nodeid, generation, bc_addr, &bc_remote,
1518                           sizeof(bc_remote));
1519         if (!error && bc_remote & cpu_to_be32(0x80000000) &&
1520             bc_remote != bc_local)
1521                 hpsb_node_write(ne, bc_addr, &bc_local, sizeof(bc_local));
1522 }
1523
1524
1525 static void nodemgr_probe_ne(struct host_info *hi, struct node_entry *ne, int generation)
1526 {
1527         struct device *dev;
1528
1529         if (ne->host != hi->host || ne->in_limbo)
1530                 return;
1531
1532         dev = get_device(&ne->device);
1533         if (!dev)
1534                 return;
1535
1536         nodemgr_irm_write_bc(ne, generation);
1537
1538         /* If "needs_probe", then this is either a new or changed node we
1539          * rescan totally. If the generation matches for an existing node
1540          * (one that existed prior to the bus reset) we send update calls
1541          * down to the drivers. Otherwise, this is a dead node and we
1542          * suspend it. */
1543         if (ne->needs_probe)
1544                 nodemgr_process_root_directory(hi, ne);
1545         else if (ne->generation == generation)
1546                 nodemgr_update_pdrv(ne);
1547         else
1548                 nodemgr_suspend_ne(ne);
1549
1550         put_device(dev);
1551 }
1552
1553 struct probe_param {
1554         struct host_info *hi;
1555         int generation;
1556 };
1557
1558 static int __nodemgr_node_probe(struct device *dev, void *data)
1559 {
1560         struct probe_param *param = (struct probe_param *)data;
1561         struct node_entry *ne;
1562
1563         ne = container_of(dev, struct node_entry, node_dev);
1564         if (!ne->needs_probe)
1565                 nodemgr_probe_ne(param->hi, ne, param->generation);
1566         if (ne->needs_probe)
1567                 nodemgr_probe_ne(param->hi, ne, param->generation);
1568         return 0;
1569 }
1570
1571 static void nodemgr_node_probe(struct host_info *hi, int generation)
1572 {
1573         struct hpsb_host *host = hi->host;
1574         struct probe_param param;
1575
1576         param.hi = hi;
1577         param.generation = generation;
1578         /* Do some processing of the nodes we've probed. This pulls them
1579          * into the sysfs layer if needed, and can result in processing of
1580          * unit-directories, or just updating the node and it's
1581          * unit-directories.
1582          *
1583          * Run updates before probes. Usually, updates are time-critical
1584          * while probes are time-consuming. (Well, those probes need some
1585          * improvement...) */
1586
1587         class_for_each_device(&nodemgr_ne_class, &param, __nodemgr_node_probe);
1588
1589         /* If we had a bus reset while we were scanning the bus, it is
1590          * possible that we did not probe all nodes.  In that case, we
1591          * skip the clean up for now, since we could remove nodes that
1592          * were still on the bus.  Another bus scan is pending which will
1593          * do the clean up eventually.
1594          *
1595          * Now let's tell the bus to rescan our devices. This may seem
1596          * like overhead, but the driver-model core will only scan a
1597          * device for a driver when either the device is added, or when a
1598          * new driver is added. A bus reset is a good reason to rescan
1599          * devices that were there before.  For example, an sbp2 device
1600          * may become available for login, if the host that held it was
1601          * just removed.  */
1602
1603         if (generation == get_hpsb_generation(host))
1604                 if (bus_rescan_devices(&ieee1394_bus_type))
1605                         HPSB_DEBUG("bus_rescan_devices had an error");
1606 }
1607
1608 static int nodemgr_send_resume_packet(struct hpsb_host *host)
1609 {
1610         struct hpsb_packet *packet;
1611         int error = -ENOMEM;
1612
1613         packet = hpsb_make_phypacket(host,
1614                         EXTPHYPACKET_TYPE_RESUME |
1615                         NODEID_TO_NODE(host->node_id) << PHYPACKET_PORT_SHIFT);
1616         if (packet) {
1617                 packet->no_waiter = 1;
1618                 packet->generation = get_hpsb_generation(host);
1619                 error = hpsb_send_packet(packet);
1620         }
1621         if (error)
1622                 HPSB_WARN("fw-host%d: Failed to broadcast resume packet",
1623                           host->id);
1624         return error;
1625 }
1626
1627 /* Perform a few high-level IRM responsibilities. */
1628 static int nodemgr_do_irm_duties(struct hpsb_host *host, int cycles)
1629 {
1630         quadlet_t bc;
1631
1632         /* if irm_id == -1 then there is no IRM on this bus */
1633         if (!host->is_irm || host->irm_id == (nodeid_t)-1)
1634                 return 1;
1635
1636         /* We are a 1394a-2000 compliant IRM. Set the validity bit. */
1637         host->csr.broadcast_channel |= 0x40000000;
1638
1639         /* If there is no bus manager then we should set the root node's
1640          * force_root bit to promote bus stability per the 1394
1641          * spec. (8.4.2.6) */
1642         if (host->busmgr_id == 0xffff && host->node_count > 1)
1643         {
1644                 u16 root_node = host->node_count - 1;
1645
1646                 /* get cycle master capability flag from root node */
1647                 if (host->is_cycmst ||
1648                     (!hpsb_read(host, LOCAL_BUS | root_node, get_hpsb_generation(host),
1649                                 (CSR_REGISTER_BASE + CSR_CONFIG_ROM + 2 * sizeof(quadlet_t)),
1650                                 &bc, sizeof(quadlet_t)) &&
1651                      be32_to_cpu(bc) & 1 << CSR_CMC_SHIFT))
1652                         hpsb_send_phy_config(host, root_node, -1);
1653                 else {
1654                         HPSB_DEBUG("The root node is not cycle master capable; "
1655                                    "selecting a new root node and resetting...");
1656
1657                         if (cycles >= 5) {
1658                                 /* Oh screw it! Just leave the bus as it is */
1659                                 HPSB_DEBUG("Stopping reset loop for IRM sanity");
1660                                 return 1;
1661                         }
1662
1663                         hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1664                         hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1665
1666                         return 0;
1667                 }
1668         }
1669
1670         /* Some devices suspend their ports while being connected to an inactive
1671          * host adapter, i.e. if connected before the low-level driver is
1672          * loaded.  They become visible either when physically unplugged and
1673          * replugged, or when receiving a resume packet.  Send one once. */
1674         if (!host->resume_packet_sent && !nodemgr_send_resume_packet(host))
1675                 host->resume_packet_sent = 1;
1676
1677         return 1;
1678 }
1679
1680 /* We need to ensure that if we are not the IRM, that the IRM node is capable of
1681  * everything we can do, otherwise issue a bus reset and try to become the IRM
1682  * ourselves. */
1683 static int nodemgr_check_irm_capability(struct hpsb_host *host, int cycles)
1684 {
1685         quadlet_t bc;
1686         int status;
1687
1688         if (hpsb_disable_irm || host->is_irm)
1689                 return 1;
1690
1691         status = hpsb_read(host, LOCAL_BUS | (host->irm_id),
1692                            get_hpsb_generation(host),
1693                            (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL),
1694                            &bc, sizeof(quadlet_t));
1695
1696         if (status < 0 || !(be32_to_cpu(bc) & 0x80000000)) {
1697                 /* The current irm node does not have a valid BROADCAST_CHANNEL
1698                  * register and we do, so reset the bus with force_root set */
1699                 HPSB_DEBUG("Current remote IRM is not 1394a-2000 compliant, resetting...");
1700
1701                 if (cycles >= 5) {
1702                         /* Oh screw it! Just leave the bus as it is */
1703                         HPSB_DEBUG("Stopping reset loop for IRM sanity");
1704                         return 1;
1705                 }
1706
1707                 hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1708                 hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1709
1710                 return 0;
1711         }
1712
1713         return 1;
1714 }
1715
1716 static int nodemgr_host_thread(void *__hi)
1717 {
1718         struct host_info *hi = (struct host_info *)__hi;
1719         struct hpsb_host *host = hi->host;
1720         unsigned int g, generation = 0;
1721         int i, reset_cycles = 0;
1722
1723         set_freezable();
1724         /* Setup our device-model entries */
1725         nodemgr_create_host_dev_files(host);
1726
1727         for (;;) {
1728                 /* Sleep until next bus reset */
1729                 set_current_state(TASK_INTERRUPTIBLE);
1730                 if (get_hpsb_generation(host) == generation &&
1731                     !kthread_should_stop())
1732                         schedule();
1733                 __set_current_state(TASK_RUNNING);
1734
1735                 /* Thread may have been woken up to freeze or to exit */
1736                 if (try_to_freeze())
1737                         continue;
1738                 if (kthread_should_stop())
1739                         goto exit;
1740
1741                 /* Pause for 1/4 second in 1/16 second intervals,
1742                  * to make sure things settle down. */
1743                 g = get_hpsb_generation(host);
1744                 for (i = 0; i < 4 ; i++) {
1745                         msleep_interruptible(63);
1746                         if (kthread_should_stop())
1747                                 goto exit;
1748
1749                         /* Now get the generation in which the node ID's we collect
1750                          * are valid.  During the bus scan we will use this generation
1751                          * for the read transactions, so that if another reset occurs
1752                          * during the scan the transactions will fail instead of
1753                          * returning bogus data. */
1754                         generation = get_hpsb_generation(host);
1755
1756                         /* If we get a reset before we are done waiting, then
1757                          * start the waiting over again */
1758                         if (generation != g)
1759                                 g = generation, i = 0;
1760                 }
1761
1762                 if (!nodemgr_check_irm_capability(host, reset_cycles) ||
1763                     !nodemgr_do_irm_duties(host, reset_cycles)) {
1764                         reset_cycles++;
1765                         continue;
1766                 }
1767                 reset_cycles = 0;
1768
1769                 /* Scan our nodes to get the bus options and create node
1770                  * entries. This does not do the sysfs stuff, since that
1771                  * would trigger uevents and such, which is a bad idea at
1772                  * this point. */
1773                 nodemgr_node_scan(hi, generation);
1774
1775                 /* This actually does the full probe, with sysfs
1776                  * registration. */
1777                 nodemgr_node_probe(hi, generation);
1778
1779                 /* Update some of our sysfs symlinks */
1780                 nodemgr_update_host_dev_links(host);
1781         }
1782 exit:
1783         HPSB_VERBOSE("NodeMgr: Exiting thread");
1784         return 0;
1785 }
1786
1787 struct host_iter_param {
1788         void *data;
1789         int (*cb)(struct hpsb_host *, void *);
1790 };
1791
1792 static int __nodemgr_for_each_host(struct device *dev, void *data)
1793 {
1794         struct hpsb_host *host;
1795         struct host_iter_param *hip = (struct host_iter_param *)data;
1796         int error = 0;
1797
1798         host = container_of(dev, struct hpsb_host, host_dev);
1799         error = hip->cb(host, hip->data);
1800
1801         return error;
1802 }
1803 /**
1804  * nodemgr_for_each_host - call a function for each IEEE 1394 host
1805  * @data: an address to supply to the callback
1806  * @cb: function to call for each host
1807  *
1808  * Iterate the hosts, calling a given function with supplied data for each host.
1809  * If the callback fails on a host, i.e. if it returns a non-zero value, the
1810  * iteration is stopped.
1811  *
1812  * Return value: 0 on success, non-zero on failure (same as returned by last run
1813  * of the callback).
1814  */
1815 int nodemgr_for_each_host(void *data, int (*cb)(struct hpsb_host *, void *))
1816 {
1817         struct host_iter_param hip;
1818         int error;
1819
1820         hip.cb = cb;
1821         hip.data = data;
1822         error = class_for_each_device(&hpsb_host_class, &hip,
1823                                       __nodemgr_for_each_host);
1824
1825         return error;
1826 }
1827
1828 /* The following two convenience functions use a struct node_entry
1829  * for addressing a node on the bus.  They are intended for use by any
1830  * process context, not just the nodemgr thread, so we need to be a
1831  * little careful when reading out the node ID and generation.  The
1832  * thing that can go wrong is that we get the node ID, then a bus
1833  * reset occurs, and then we read the generation.  The node ID is
1834  * possibly invalid, but the generation is current, and we end up
1835  * sending a packet to a the wrong node.
1836  *
1837  * The solution is to make sure we read the generation first, so that
1838  * if a reset occurs in the process, we end up with a stale generation
1839  * and the transactions will fail instead of silently using wrong node
1840  * ID's.
1841  */
1842
1843 /**
1844  * hpsb_node_fill_packet - fill some destination information into a packet
1845  * @ne: destination node
1846  * @packet: packet to fill in
1847  *
1848  * This will fill in the given, pre-initialised hpsb_packet with the current
1849  * information from the node entry (host, node ID, bus generation number).
1850  */
1851 void hpsb_node_fill_packet(struct node_entry *ne, struct hpsb_packet *packet)
1852 {
1853         packet->host = ne->host;
1854         packet->generation = ne->generation;
1855         barrier();
1856         packet->node_id = ne->nodeid;
1857 }
1858
1859 int hpsb_node_write(struct node_entry *ne, u64 addr,
1860                     quadlet_t *buffer, size_t length)
1861 {
1862         unsigned int generation = ne->generation;
1863
1864         barrier();
1865         return hpsb_write(ne->host, ne->nodeid, generation,
1866                           addr, buffer, length);
1867 }
1868
1869 static void nodemgr_add_host(struct hpsb_host *host)
1870 {
1871         struct host_info *hi;
1872
1873         hi = hpsb_create_hostinfo(&nodemgr_highlevel, host, sizeof(*hi));
1874         if (!hi) {
1875                 HPSB_ERR("NodeMgr: out of memory in add host");
1876                 return;
1877         }
1878         hi->host = host;
1879         hi->thread = kthread_run(nodemgr_host_thread, hi, "knodemgrd_%d",
1880                                  host->id);
1881         if (IS_ERR(hi->thread)) {
1882                 HPSB_ERR("NodeMgr: cannot start thread for host %d", host->id);
1883                 hpsb_destroy_hostinfo(&nodemgr_highlevel, host);
1884         }
1885 }
1886
1887 static void nodemgr_host_reset(struct hpsb_host *host)
1888 {
1889         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1890
1891         if (hi) {
1892                 HPSB_VERBOSE("NodeMgr: Processing reset for host %d", host->id);
1893                 wake_up_process(hi->thread);
1894         }
1895 }
1896
1897 static void nodemgr_remove_host(struct hpsb_host *host)
1898 {
1899         struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1900
1901         if (hi) {
1902                 kthread_stop(hi->thread);
1903                 nodemgr_remove_host_dev(&host->device);
1904         }
1905 }
1906
1907 static struct hpsb_highlevel nodemgr_highlevel = {
1908         .name =         "Node manager",
1909         .add_host =     nodemgr_add_host,
1910         .host_reset =   nodemgr_host_reset,
1911         .remove_host =  nodemgr_remove_host,
1912 };
1913
1914 int init_ieee1394_nodemgr(void)
1915 {
1916         int error;
1917
1918         error = class_register(&nodemgr_ne_class);
1919         if (error)
1920                 goto fail_ne;
1921         error = class_register(&nodemgr_ud_class);
1922         if (error)
1923                 goto fail_ud;
1924         error = driver_register(&nodemgr_mid_layer_driver);
1925         if (error)
1926                 goto fail_ml;
1927         /* This driver is not used if nodemgr is off (disable_nodemgr=1). */
1928         nodemgr_dev_template_host.driver = &nodemgr_mid_layer_driver;
1929
1930         hpsb_register_highlevel(&nodemgr_highlevel);
1931         return 0;
1932
1933 fail_ml:
1934         class_unregister(&nodemgr_ud_class);
1935 fail_ud:
1936         class_unregister(&nodemgr_ne_class);
1937 fail_ne:
1938         return error;
1939 }
1940
1941 void cleanup_ieee1394_nodemgr(void)
1942 {
1943         hpsb_unregister_highlevel(&nodemgr_highlevel);
1944         driver_unregister(&nodemgr_mid_layer_driver);
1945         class_unregister(&nodemgr_ud_class);
1946         class_unregister(&nodemgr_ne_class);
1947 }