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