drivers/ieee1394/highlevel.c

   1 /*
   2  * IEEE 1394 for Linux
   3  *
   4  * Copyright (C) 1999 Andreas E. Bombe
   5  *
   6  * This code is licensed under the GPL.  See the file COPYING in the root
   7  * directory of the kernel sources for details.
   8  *
   9  *
  10  * Contributions:
  11  *
  12  * Christian Toegel <christian.toegel@gmx.at>
  13  *        unregister address space
  14  *
  15  * Manfred Weihs <weihs@ict.tuwien.ac.at>
  16  *        unregister address space
  17  *
  18  */
  19
  20 #include <linux/slab.h>
  21 #include <linux/list.h>
  22 #include <linux/bitops.h>
  23
  24 #include "ieee1394.h"
  25 #include "ieee1394_types.h"
  26 #include "hosts.h"
  27 #include "ieee1394_core.h"
  28 #include "highlevel.h"
  29 #include "nodemgr.h"
  30
  31
  32 struct hl_host_info {
  33         struct list_head list;
  34         struct hpsb_host *host;
  35         size_t size;
  36         unsigned long key;
  37         void *data;
  38 };
  39
  40
  41 static LIST_HEAD(hl_drivers);
  42 static DECLARE_RWSEM(hl_drivers_sem);
  43
  44 static LIST_HEAD(hl_irqs);
  45 static DEFINE_RWLOCK(hl_irqs_lock);
  46
  47 static DEFINE_RWLOCK(addr_space_lock);
  48
  49 /* addr_space list will have zero and max already included as bounds */
  50 static struct hpsb_address_ops dummy_ops = { NULL, NULL, NULL, NULL };
  51 static struct hpsb_address_serve dummy_zero_addr, dummy_max_addr;
  52
  53
  54 static struct hl_host_info *hl_get_hostinfo(struct hpsb_highlevel *hl,
  55                                             struct hpsb_host *host)
  56 {
  57         struct hl_host_info *hi = NULL;
  58
  59         if (!hl || !host)
  60                 return NULL;
  61
  62         read_lock(&hl->host_info_lock);
  63         list_for_each_entry(hi, &hl->host_info_list, list) {
  64                 if (hi->host == host) {
  65                         read_unlock(&hl->host_info_lock);
  66                         return hi;
  67                 }
  68         }
  69         read_unlock(&hl->host_info_lock);
  70         return NULL;
  71 }
  72
  73 /**
  74  * hpsb_get_hostinfo - retrieve a hostinfo pointer bound to this driver/host
  75  *
  76  * Returns a per @host and @hl driver data structure that was previously stored
  77  * by hpsb_create_hostinfo.
  78  */
  79 void *hpsb_get_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host)
  80 {
  81         struct hl_host_info *hi = hl_get_hostinfo(hl, host);
  82
  83         return hi ? hi->data : NULL;
  84 }
  85
  86 /**
  87  * hpsb_create_hostinfo - allocate a hostinfo pointer bound to this driver/host
  88  *
  89  * Allocate a hostinfo pointer backed by memory with @data_size and bind it to
  90  * to this @hl driver and @host.  If @data_size is zero, then the return here is
  91  * only valid for error checking.
  92  */
  93 void *hpsb_create_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host,
  94                            size_t data_size)
  95 {
  96         struct hl_host_info *hi;
  97         void *data;
  98         unsigned long flags;
  99
 100         hi = hl_get_hostinfo(hl, host);
 101         if (hi) {
 102                 HPSB_ERR("%s called hpsb_create_hostinfo when hostinfo already"
 103                          " exists", hl->name);
 104                 return NULL;
 105         }
 106
 107         hi = kzalloc(sizeof(*hi) + data_size, GFP_ATOMIC);
 108         if (!hi)
 109                 return NULL;
 110
 111         if (data_size) {
 112                 data = hi->data = hi + 1;
 113                 hi->size = data_size;
 114         } else
 115                 data = hi;
 116
 117         hi->host = host;
 118
 119         write_lock_irqsave(&hl->host_info_lock, flags);
 120         list_add_tail(&hi->list, &hl->host_info_list);
 121         write_unlock_irqrestore(&hl->host_info_lock, flags);
 122
 123         return data;
 124 }
 125
 126 /**
 127  * hpsb_set_hostinfo - set the hostinfo pointer to something useful
 128  *
 129  * Usually follows a call to hpsb_create_hostinfo, where the size is 0.
 130  */
 131 int hpsb_set_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host,
 132                       void *data)
 133 {
 134         struct hl_host_info *hi;
 135
 136         hi = hl_get_hostinfo(hl, host);
 137         if (hi) {
 138                 if (!hi->size && !hi->data) {
 139                         hi->data = data;
 140                         return 0;
 141                 } else
 142                         HPSB_ERR("%s called hpsb_set_hostinfo when hostinfo "
 143                                  "already has data", hl->name);
 144         } else
 145                 HPSB_ERR("%s called hpsb_set_hostinfo when no hostinfo exists",
 146                          hl->name);
 147         return -EINVAL;
 148 }
 149
 150 /**
 151  * hpsb_destroy_hostinfo - free and remove a hostinfo pointer
 152  *
 153  * Free and remove the hostinfo pointer bound to this @hl driver and @host.
 154  */
 155 void hpsb_destroy_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host)
 156 {
 157         struct hl_host_info *hi;
 158
 159         hi = hl_get_hostinfo(hl, host);
 160         if (hi) {
 161                 unsigned long flags;
 162                 write_lock_irqsave(&hl->host_info_lock, flags);
 163                 list_del(&hi->list);
 164                 write_unlock_irqrestore(&hl->host_info_lock, flags);
 165                 kfree(hi);
 166         }
 167         return;
 168 }
 169
 170 /**
 171  * hpsb_set_hostinfo_key - set an alternate lookup key for an hostinfo
 172  *
 173  * Sets an alternate lookup key for the hostinfo bound to this @hl driver and
 174  * @host.
 175  */
 176 void hpsb_set_hostinfo_key(struct hpsb_highlevel *hl, struct hpsb_host *host,
 177                            unsigned long key)
 178 {
 179         struct hl_host_info *hi;
 180
 181         hi = hl_get_hostinfo(hl, host);
 182         if (hi)
 183                 hi->key = key;
 184         return;
 185 }
 186
 187 /**
 188  * hpsb_get_hostinfo_bykey - retrieve a hostinfo pointer by its alternate key
 189  */
 190 void *hpsb_get_hostinfo_bykey(struct hpsb_highlevel *hl, unsigned long key)
 191 {
 192         struct hl_host_info *hi;
 193         void *data = NULL;
 194
 195         if (!hl)
 196                 return NULL;
 197
 198         read_lock(&hl->host_info_lock);
 199         list_for_each_entry(hi, &hl->host_info_list, list) {
 200                 if (hi->key == key) {
 201                         data = hi->data;
 202                         break;
 203                 }
 204         }
 205         read_unlock(&hl->host_info_lock);
 206         return data;
 207 }
 208
 209 static int highlevel_for_each_host_reg(struct hpsb_host *host, void *__data)
 210 {
 211         struct hpsb_highlevel *hl = __data;
 212
 213         hl->add_host(host);
 214
 215         if (host->update_config_rom && hpsb_update_config_rom_image(host) < 0)
 216                 HPSB_ERR("Failed to generate Configuration ROM image for host "
 217                          "%s-%d", hl->name, host->id);
 218         return 0;
 219 }
 220
 221 /**
 222  * hpsb_register_highlevel - register highlevel driver
 223  *
 224  * The name pointer in @hl has to stay valid at all times because the string is
 225  * not copied.
 226  */
 227 void hpsb_register_highlevel(struct hpsb_highlevel *hl)
 228 {
 229         unsigned long flags;
 230
 231         INIT_LIST_HEAD(&hl->addr_list);
 232         INIT_LIST_HEAD(&hl->host_info_list);
 233
 234         rwlock_init(&hl->host_info_lock);
 235
 236         down_write(&hl_drivers_sem);
 237         list_add_tail(&hl->hl_list, &hl_drivers);
 238         up_write(&hl_drivers_sem);
 239
 240         write_lock_irqsave(&hl_irqs_lock, flags);
 241         list_add_tail(&hl->irq_list, &hl_irqs);
 242         write_unlock_irqrestore(&hl_irqs_lock, flags);
 243
 244         if (hl->add_host)
 245                 nodemgr_for_each_host(hl, highlevel_for_each_host_reg);
 246         return;
 247 }
 248
 249 static void __delete_addr(struct hpsb_address_serve *as)
 250 {
 251         list_del(&as->host_list);
 252         list_del(&as->hl_list);
 253         kfree(as);
 254 }
 255
 256 static void __unregister_host(struct hpsb_highlevel *hl, struct hpsb_host *host,
 257                               int update_cr)
 258 {
 259         unsigned long flags;
 260         struct list_head *lh, *next;
 261         struct hpsb_address_serve *as;
 262
 263         /* First, let the highlevel driver unreg */
 264         if (hl->remove_host)
 265                 hl->remove_host(host);
 266
 267         /* Remove any addresses that are matched for this highlevel driver
 268          * and this particular host. */
 269         write_lock_irqsave(&addr_space_lock, flags);
 270         list_for_each_safe (lh, next, &hl->addr_list) {
 271                 as = list_entry(lh, struct hpsb_address_serve, hl_list);
 272                 if (as->host == host)
 273                         __delete_addr(as);
 274         }
 275         write_unlock_irqrestore(&addr_space_lock, flags);
 276
 277         /* Now update the config-rom to reflect anything removed by the
 278          * highlevel driver. */
 279         if (update_cr && host->update_config_rom &&
 280             hpsb_update_config_rom_image(host) < 0)
 281                 HPSB_ERR("Failed to generate Configuration ROM image for host "
 282                          "%s-%d", hl->name, host->id);
 283
 284         /* Finally remove all the host info associated between these two. */
 285         hpsb_destroy_hostinfo(hl, host);
 286 }
 287
 288 static int highlevel_for_each_host_unreg(struct hpsb_host *host, void *__data)
 289 {
 290         struct hpsb_highlevel *hl = __data;
 291
 292         __unregister_host(hl, host, 1);
 293         return 0;
 294 }
 295
 296 /**
 297  * hpsb_unregister_highlevel - unregister highlevel driver
 298  */
 299 void hpsb_unregister_highlevel(struct hpsb_highlevel *hl)
 300 {
 301         unsigned long flags;
 302
 303         write_lock_irqsave(&hl_irqs_lock, flags);
 304         list_del(&hl->irq_list);
 305         write_unlock_irqrestore(&hl_irqs_lock, flags);
 306
 307         down_write(&hl_drivers_sem);
 308         list_del(&hl->hl_list);
 309         up_write(&hl_drivers_sem);
 310
 311         nodemgr_for_each_host(hl, highlevel_for_each_host_unreg);
 312 }
 313
 314 /**
 315  * hpsb_allocate_and_register_addrspace - alloc' and reg' a host address space
 316  *
 317  * @start and @end are 48 bit pointers and have to be quadlet aligned.
 318  * @end points to the first address behind the handled addresses.  This
 319  * function can be called multiple times for a single hpsb_highlevel @hl to
 320  * implement sparse register sets.  The requested region must not overlap any
 321  * previously allocated region, otherwise registering will fail.
 322  *
 323  * It returns true for successful allocation.  Address spaces can be
 324  * unregistered with hpsb_unregister_addrspace.  All remaining address spaces
 325  * are automatically deallocated together with the hpsb_highlevel @hl.
 326  */
 327 u64 hpsb_allocate_and_register_addrspace(struct hpsb_highlevel *hl,
 328                                          struct hpsb_host *host,
 329                                          struct hpsb_address_ops *ops,
 330                                          u64 size, u64 alignment,
 331                                          u64 start, u64 end)
 332 {
 333         struct hpsb_address_serve *as, *a1, *a2;
 334         struct list_head *entry;
 335         u64 retval = CSR1212_INVALID_ADDR_SPACE;
 336         unsigned long flags;
 337         u64 align_mask = ~(alignment - 1);
 338
 339         if ((alignment & 3) || (alignment > 0x800000000000ULL) ||
 340             (hweight64(alignment) != 1)) {
 341                 HPSB_ERR("%s called with invalid alignment: 0x%048llx",
 342                          __func__, (unsigned long long)alignment);
 343                 return retval;
 344         }
 345
 346         /* default range,
 347          * avoids controller's posted write area (see OHCI 1.1 clause 1.5) */
 348         if (start == CSR1212_INVALID_ADDR_SPACE &&
 349             end   == CSR1212_INVALID_ADDR_SPACE) {
 350                 start = host->middle_addr_space;
 351                 end   = CSR1212_ALL_SPACE_END;
 352         }
 353
 354         if (((start|end) & ~align_mask) || (start >= end) ||
 355             (end > CSR1212_ALL_SPACE_END)) {
 356                 HPSB_ERR("%s called with invalid addresses "
 357                          "(start = %012Lx  end = %012Lx)", __func__,
 358                          (unsigned long long)start,(unsigned long long)end);
 359                 return retval;
 360         }
 361
 362         as = kmalloc(sizeof(*as), GFP_KERNEL);
 363         if (!as)
 364                 return retval;
 365
 366         INIT_LIST_HEAD(&as->host_list);
 367         INIT_LIST_HEAD(&as->hl_list);
 368         as->op = ops;
 369         as->host = host;
 370
 371         write_lock_irqsave(&addr_space_lock, flags);
 372         list_for_each(entry, &host->addr_space) {
 373                 u64 a1sa, a1ea;
 374                 u64 a2sa, a2ea;
 375
 376                 a1 = list_entry(entry, struct hpsb_address_serve, host_list);
 377                 a2 = list_entry(entry->next, struct hpsb_address_serve,
 378                                 host_list);
 379
 380                 a1sa = a1->start & align_mask;
 381                 a1ea = (a1->end + alignment -1) & align_mask;
 382                 a2sa = a2->start & align_mask;
 383                 a2ea = (a2->end + alignment -1) & align_mask;
 384
 385                 if ((a2sa - a1ea >= size) && (a2sa - start >= size) &&
 386                     (a2sa > start)) {
 387                         as->start = max(start, a1ea);
 388                         as->end = as->start + size;
 389                         list_add(&as->host_list, entry);
 390                         list_add_tail(&as->hl_list, &hl->addr_list);
 391                         retval = as->start;
 392                         break;
 393                 }
 394         }
 395         write_unlock_irqrestore(&addr_space_lock, flags);
 396
 397         if (retval == CSR1212_INVALID_ADDR_SPACE)
 398                 kfree(as);
 399         return retval;
 400 }
 401
 402 /**
 403  * hpsb_register_addrspace - register a host address space
 404  *
 405  * @start and @end are 48 bit pointers and have to be quadlet aligned.
 406  * @end points to the first address behind the handled addresses.  This
 407  * function can be called multiple times for a single hpsb_highlevel @hl to
 408  * implement sparse register sets.  The requested region must not overlap any
 409  * previously allocated region, otherwise registering will fail.
 410  *
 411  * It returns true for successful allocation.  Address spaces can be
 412  * unregistered with hpsb_unregister_addrspace.  All remaining address spaces
 413  * are automatically deallocated together with the hpsb_highlevel @hl.
 414  */
 415 int hpsb_register_addrspace(struct hpsb_highlevel *hl, struct hpsb_host *host,
 416                             struct hpsb_address_ops *ops, u64 start, u64 end)
 417 {
 418         struct hpsb_address_serve *as;
 419         struct list_head *lh;
 420         int retval = 0;
 421         unsigned long flags;
 422
 423         if (((start|end) & 3) || (start >= end) ||
 424             (end > CSR1212_ALL_SPACE_END)) {
 425                 HPSB_ERR("%s called with invalid addresses", __func__);
 426                 return 0;
 427         }
 428
 429         as = kmalloc(sizeof(*as), GFP_ATOMIC);
 430         if (!as)
 431                 return 0;
 432
 433         INIT_LIST_HEAD(&as->host_list);
 434         INIT_LIST_HEAD(&as->hl_list);
 435         as->op = ops;
 436         as->start = start;
 437         as->end = end;
 438         as->host = host;
 439
 440         write_lock_irqsave(&addr_space_lock, flags);
 441         list_for_each(lh, &host->addr_space) {
 442                 struct hpsb_address_serve *as_this =
 443                         list_entry(lh, struct hpsb_address_serve, host_list);
 444                 struct hpsb_address_serve *as_next =
 445                         list_entry(lh->next, struct hpsb_address_serve,
 446                                    host_list);
 447
 448                 if (as_this->end > as->start)
 449                         break;
 450
 451                 if (as_next->start >= as->end) {
 452                         list_add(&as->host_list, lh);
 453                         list_add_tail(&as->hl_list, &hl->addr_list);
 454                         retval = 1;
 455                         break;
 456                 }
 457         }
 458         write_unlock_irqrestore(&addr_space_lock, flags);
 459
 460         if (retval == 0)
 461                 kfree(as);
 462         return retval;
 463 }
 464
 465 int hpsb_unregister_addrspace(struct hpsb_highlevel *hl, struct hpsb_host *host,
 466                               u64 start)
 467 {
 468         int retval = 0;
 469         struct hpsb_address_serve *as;
 470         struct list_head *lh, *next;
 471         unsigned long flags;
 472
 473         write_lock_irqsave(&addr_space_lock, flags);
 474         list_for_each_safe (lh, next, &hl->addr_list) {
 475                 as = list_entry(lh, struct hpsb_address_serve, hl_list);
 476                 if (as->start == start && as->host == host) {
 477                         __delete_addr(as);
 478                         retval = 1;
 479                         break;
 480                 }
 481         }
 482         write_unlock_irqrestore(&addr_space_lock, flags);
 483         return retval;
 484 }
 485
 486 static void init_hpsb_highlevel(struct hpsb_host *host)
 487 {
 488         INIT_LIST_HEAD(&dummy_zero_addr.host_list);
 489         INIT_LIST_HEAD(&dummy_zero_addr.hl_list);
 490         INIT_LIST_HEAD(&dummy_max_addr.host_list);
 491         INIT_LIST_HEAD(&dummy_max_addr.hl_list);
 492
 493         dummy_zero_addr.op = dummy_max_addr.op = &dummy_ops;
 494
 495         dummy_zero_addr.start = dummy_zero_addr.end = 0;
 496         dummy_max_addr.start = dummy_max_addr.end = ((u64) 1) << 48;
 497
 498         list_add_tail(&dummy_zero_addr.host_list, &host->addr_space);
 499         list_add_tail(&dummy_max_addr.host_list, &host->addr_space);
 500 }
 501
 502 void highlevel_add_host(struct hpsb_host *host)
 503 {
 504         struct hpsb_highlevel *hl;
 505
 506         init_hpsb_highlevel(host);
 507
 508         down_read(&hl_drivers_sem);
 509         list_for_each_entry(hl, &hl_drivers, hl_list) {
 510                 if (hl->add_host)
 511                         hl->add_host(host);
 512         }
 513         up_read(&hl_drivers_sem);
 514         if (host->update_config_rom && hpsb_update_config_rom_image(host) < 0)
 515                 HPSB_ERR("Failed to generate Configuration ROM image for host "
 516                          "%s-%d", hl->name, host->id);
 517 }
 518
 519 void highlevel_remove_host(struct hpsb_host *host)
 520 {
 521         struct hpsb_highlevel *hl;
 522
 523         down_read(&hl_drivers_sem);
 524         list_for_each_entry(hl, &hl_drivers, hl_list)
 525                 __unregister_host(hl, host, 0);
 526         up_read(&hl_drivers_sem);
 527 }
 528
 529 void highlevel_host_reset(struct hpsb_host *host)
 530 {
 531         unsigned long flags;
 532         struct hpsb_highlevel *hl;
 533
 534         read_lock_irqsave(&hl_irqs_lock, flags);
 535         list_for_each_entry(hl, &hl_irqs, irq_list) {
 536                 if (hl->host_reset)
 537                         hl->host_reset(host);
 538         }
 539         read_unlock_irqrestore(&hl_irqs_lock, flags);
 540 }
 541
 542 void highlevel_fcp_request(struct hpsb_host *host, int nodeid, int direction,
 543                            void *data, size_t length)
 544 {
 545         unsigned long flags;
 546         struct hpsb_highlevel *hl;
 547         int cts = ((quadlet_t *)data)[0] >> 4;
 548
 549         read_lock_irqsave(&hl_irqs_lock, flags);
 550         list_for_each_entry(hl, &hl_irqs, irq_list) {
 551                 if (hl->fcp_request)
 552                         hl->fcp_request(host, nodeid, direction, cts, data,
 553                                         length);
 554         }
 555         read_unlock_irqrestore(&hl_irqs_lock, flags);
 556 }
 557
 558 /*
 559  * highlevel_read, highlevel_write, highlevel_lock, highlevel_lock64:
 560  *
 561  * These functions are called to handle transactions. They are called when a
 562  * packet arrives.  The flags argument contains the second word of the first
 563  * header quadlet of the incoming packet (containing transaction label, retry
 564  * code, transaction code and priority).  These functions either return a
 565  * response code or a negative number.  In the first case a response will be
 566  * generated.  In the latter case, no response will be sent and the driver which
 567  * handled the request will send the response itself.
 568  */
 569 int highlevel_read(struct hpsb_host *host, int nodeid, void *data, u64 addr,
 570                    unsigned int length, u16 flags)
 571 {
 572         struct hpsb_address_serve *as;
 573         unsigned int partlength;
 574         int rcode = RCODE_ADDRESS_ERROR;
 575
 576         read_lock(&addr_space_lock);
 577         list_for_each_entry(as, &host->addr_space, host_list) {
 578                 if (as->start > addr)
 579                         break;
 580
 581                 if (as->end > addr) {
 582                         partlength = min(as->end - addr, (u64) length);
 583
 584                         if (as->op->read)
 585                                 rcode = as->op->read(host, nodeid, data,
 586                                                      addr, partlength, flags);
 587                         else
 588                                 rcode = RCODE_TYPE_ERROR;
 589
 590                         data += partlength;
 591                         length -= partlength;
 592                         addr += partlength;
 593
 594                         if ((rcode != RCODE_COMPLETE) || !length)
 595                                 break;
 596                 }
 597         }
 598         read_unlock(&addr_space_lock);
 599
 600         if (length && (rcode == RCODE_COMPLETE))
 601                 rcode = RCODE_ADDRESS_ERROR;
 602         return rcode;
 603 }
 604
 605 int highlevel_write(struct hpsb_host *host, int nodeid, int destid, void *data,
 606                     u64 addr, unsigned int length, u16 flags)
 607 {
 608         struct hpsb_address_serve *as;
 609         unsigned int partlength;
 610         int rcode = RCODE_ADDRESS_ERROR;
 611
 612         read_lock(&addr_space_lock);
 613         list_for_each_entry(as, &host->addr_space, host_list) {
 614                 if (as->start > addr)
 615                         break;
 616
 617                 if (as->end > addr) {
 618                         partlength = min(as->end - addr, (u64) length);
 619
 620                         if (as->op->write)
 621                                 rcode = as->op->write(host, nodeid, destid,
 622                                                       data, addr, partlength,
 623                                                       flags);
 624                         else
 625                                 rcode = RCODE_TYPE_ERROR;
 626
 627                         data += partlength;
 628                         length -= partlength;
 629                         addr += partlength;
 630
 631                         if ((rcode != RCODE_COMPLETE) || !length)
 632                                 break;
 633                 }
 634         }
 635         read_unlock(&addr_space_lock);
 636
 637         if (length && (rcode == RCODE_COMPLETE))
 638                 rcode = RCODE_ADDRESS_ERROR;
 639         return rcode;
 640 }
 641
 642 int highlevel_lock(struct hpsb_host *host, int nodeid, quadlet_t *store,
 643                    u64 addr, quadlet_t data, quadlet_t arg, int ext_tcode,
 644                    u16 flags)
 645 {
 646         struct hpsb_address_serve *as;
 647         int rcode = RCODE_ADDRESS_ERROR;
 648
 649         read_lock(&addr_space_lock);
 650         list_for_each_entry(as, &host->addr_space, host_list) {
 651                 if (as->start > addr)
 652                         break;
 653
 654                 if (as->end > addr) {
 655                         if (as->op->lock)
 656                                 rcode = as->op->lock(host, nodeid, store, addr,
 657                                                      data, arg, ext_tcode,
 658                                                      flags);
 659                         else
 660                                 rcode = RCODE_TYPE_ERROR;
 661                         break;
 662                 }
 663         }
 664         read_unlock(&addr_space_lock);
 665         return rcode;
 666 }
 667
 668 int highlevel_lock64(struct hpsb_host *host, int nodeid, octlet_t *store,
 669                      u64 addr, octlet_t data, octlet_t arg, int ext_tcode,
 670                      u16 flags)
 671 {
 672         struct hpsb_address_serve *as;
 673         int rcode = RCODE_ADDRESS_ERROR;
 674
 675         read_lock(&addr_space_lock);
 676
 677         list_for_each_entry(as, &host->addr_space, host_list) {
 678                 if (as->start > addr)
 679                         break;
 680
 681                 if (as->end > addr) {
 682                         if (as->op->lock64)
 683                                 rcode = as->op->lock64(host, nodeid, store,
 684                                                        addr, data, arg,
 685                                                        ext_tcode, flags);
 686                         else
 687                                 rcode = RCODE_TYPE_ERROR;
 688                         break;
 689                 }
 690         }
 691         read_unlock(&addr_space_lock);
 692         return rcode;
 693 }