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         hpsb_init_highlevel(hl);
 232         INIT_LIST_HEAD(&hl->addr_list);
 233
 234         down_write(&hl_drivers_sem);
 235         list_add_tail(&hl->hl_list, &hl_drivers);
 236         up_write(&hl_drivers_sem);
 237
 238         write_lock_irqsave(&hl_irqs_lock, flags);
 239         list_add_tail(&hl->irq_list, &hl_irqs);
 240         write_unlock_irqrestore(&hl_irqs_lock, flags);
 241
 242         if (hl->add_host)
 243                 nodemgr_for_each_host(hl, highlevel_for_each_host_reg);
 244         return;
 245 }
 246
 247 static void __delete_addr(struct hpsb_address_serve *as)
 248 {
 249         list_del(&as->host_list);
 250         list_del(&as->hl_list);
 251         kfree(as);
 252 }
 253
 254 static void __unregister_host(struct hpsb_highlevel *hl, struct hpsb_host *host,
 255                               int update_cr)
 256 {
 257         unsigned long flags;
 258         struct list_head *lh, *next;
 259         struct hpsb_address_serve *as;
 260
 261         /* First, let the highlevel driver unreg */
 262         if (hl->remove_host)
 263                 hl->remove_host(host);
 264
 265         /* Remove any addresses that are matched for this highlevel driver
 266          * and this particular host. */
 267         write_lock_irqsave(&addr_space_lock, flags);
 268         list_for_each_safe (lh, next, &hl->addr_list) {
 269                 as = list_entry(lh, struct hpsb_address_serve, hl_list);
 270                 if (as->host == host)
 271                         __delete_addr(as);
 272         }
 273         write_unlock_irqrestore(&addr_space_lock, flags);
 274
 275         /* Now update the config-rom to reflect anything removed by the
 276          * highlevel driver. */
 277         if (update_cr && host->update_config_rom &&
 278             hpsb_update_config_rom_image(host) < 0)
 279                 HPSB_ERR("Failed to generate Configuration ROM image for host "
 280                          "%s-%d", hl->name, host->id);
 281
 282         /* Finally remove all the host info associated between these two. */
 283         hpsb_destroy_hostinfo(hl, host);
 284 }
 285
 286 static int highlevel_for_each_host_unreg(struct hpsb_host *host, void *__data)
 287 {
 288         struct hpsb_highlevel *hl = __data;
 289
 290         __unregister_host(hl, host, 1);
 291         return 0;
 292 }
 293
 294 /**
 295  * hpsb_unregister_highlevel - unregister highlevel driver
 296  */
 297 void hpsb_unregister_highlevel(struct hpsb_highlevel *hl)
 298 {
 299         unsigned long flags;
 300
 301         write_lock_irqsave(&hl_irqs_lock, flags);
 302         list_del(&hl->irq_list);
 303         write_unlock_irqrestore(&hl_irqs_lock, flags);
 304
 305         down_write(&hl_drivers_sem);
 306         list_del(&hl->hl_list);
 307         up_write(&hl_drivers_sem);
 308
 309         nodemgr_for_each_host(hl, highlevel_for_each_host_unreg);
 310 }
 311
 312 /**
 313  * hpsb_allocate_and_register_addrspace - alloc' and reg' a host address space
 314  *
 315  * @start and @end are 48 bit pointers and have to be quadlet aligned.
 316  * @end points to the first address behind the handled addresses.  This
 317  * function can be called multiple times for a single hpsb_highlevel @hl to
 318  * implement sparse register sets.  The requested region must not overlap any
 319  * previously allocated region, otherwise registering will fail.
 320  *
 321  * It returns true for successful allocation.  Address spaces can be
 322  * unregistered with hpsb_unregister_addrspace.  All remaining address spaces
 323  * are automatically deallocated together with the hpsb_highlevel @hl.
 324  */
 325 u64 hpsb_allocate_and_register_addrspace(struct hpsb_highlevel *hl,
 326                                          struct hpsb_host *host,
 327                                          struct hpsb_address_ops *ops,
 328                                          u64 size, u64 alignment,
 329                                          u64 start, u64 end)
 330 {
 331         struct hpsb_address_serve *as, *a1, *a2;
 332         struct list_head *entry;
 333         u64 retval = CSR1212_INVALID_ADDR_SPACE;
 334         unsigned long flags;
 335         u64 align_mask = ~(alignment - 1);
 336
 337         if ((alignment & 3) || (alignment > 0x800000000000ULL) ||
 338             (hweight64(alignment) != 1)) {
 339                 HPSB_ERR("%s called with invalid alignment: 0x%048llx",
 340                          __func__, (unsigned long long)alignment);
 341                 return retval;
 342         }
 343
 344         /* default range,
 345          * avoids controller's posted write area (see OHCI 1.1 clause 1.5) */
 346         if (start == CSR1212_INVALID_ADDR_SPACE &&
 347             end   == CSR1212_INVALID_ADDR_SPACE) {
 348                 start = host->middle_addr_space;
 349                 end   = CSR1212_ALL_SPACE_END;
 350         }
 351
 352         if (((start|end) & ~align_mask) || (start >= end) ||
 353             (end > CSR1212_ALL_SPACE_END)) {
 354                 HPSB_ERR("%s called with invalid addresses "
 355                          "(start = %012Lx  end = %012Lx)", __func__,
 356                          (unsigned long long)start,(unsigned long long)end);
 357                 return retval;
 358         }
 359
 360         as = kmalloc(sizeof(*as), GFP_KERNEL);
 361         if (!as)
 362                 return retval;
 363
 364         INIT_LIST_HEAD(&as->host_list);
 365         INIT_LIST_HEAD(&as->hl_list);
 366         as->op = ops;
 367         as->host = host;
 368
 369         write_lock_irqsave(&addr_space_lock, flags);
 370         list_for_each(entry, &host->addr_space) {
 371                 u64 a1sa, a1ea;
 372                 u64 a2sa, a2ea;
 373
 374                 a1 = list_entry(entry, struct hpsb_address_serve, host_list);
 375                 a2 = list_entry(entry->next, struct hpsb_address_serve,
 376                                 host_list);
 377
 378                 a1sa = a1->start & align_mask;
 379                 a1ea = (a1->end + alignment -1) & align_mask;
 380                 a2sa = a2->start & align_mask;
 381                 a2ea = (a2->end + alignment -1) & align_mask;
 382
 383                 if ((a2sa - a1ea >= size) && (a2sa - start >= size) &&
 384                     (a2sa > start)) {
 385                         as->start = max(start, a1ea);
 386                         as->end = as->start + size;
 387                         list_add(&as->host_list, entry);
 388                         list_add_tail(&as->hl_list, &hl->addr_list);
 389                         retval = as->start;
 390                         break;
 391                 }
 392         }
 393         write_unlock_irqrestore(&addr_space_lock, flags);
 394
 395         if (retval == CSR1212_INVALID_ADDR_SPACE)
 396                 kfree(as);
 397         return retval;
 398 }
 399
 400 /**
 401  * hpsb_register_addrspace - register a host address space
 402  *
 403  * @start and @end are 48 bit pointers and have to be quadlet aligned.
 404  * @end points to the first address behind the handled addresses.  This
 405  * function can be called multiple times for a single hpsb_highlevel @hl to
 406  * implement sparse register sets.  The requested region must not overlap any
 407  * previously allocated region, otherwise registering will fail.
 408  *
 409  * It returns true for successful allocation.  Address spaces can be
 410  * unregistered with hpsb_unregister_addrspace.  All remaining address spaces
 411  * are automatically deallocated together with the hpsb_highlevel @hl.
 412  */
 413 int hpsb_register_addrspace(struct hpsb_highlevel *hl, struct hpsb_host *host,
 414                             struct hpsb_address_ops *ops, u64 start, u64 end)
 415 {
 416         struct hpsb_address_serve *as;
 417         struct list_head *lh;
 418         int retval = 0;
 419         unsigned long flags;
 420
 421         if (((start|end) & 3) || (start >= end) ||
 422             (end > CSR1212_ALL_SPACE_END)) {
 423                 HPSB_ERR("%s called with invalid addresses", __func__);
 424                 return 0;
 425         }
 426
 427         as = kmalloc(sizeof(*as), GFP_ATOMIC);
 428         if (!as)
 429                 return 0;
 430
 431         INIT_LIST_HEAD(&as->host_list);
 432         INIT_LIST_HEAD(&as->hl_list);
 433         as->op = ops;
 434         as->start = start;
 435         as->end = end;
 436         as->host = host;
 437
 438         write_lock_irqsave(&addr_space_lock, flags);
 439         list_for_each(lh, &host->addr_space) {
 440                 struct hpsb_address_serve *as_this =
 441                         list_entry(lh, struct hpsb_address_serve, host_list);
 442                 struct hpsb_address_serve *as_next =
 443                         list_entry(lh->next, struct hpsb_address_serve,
 444                                    host_list);
 445
 446                 if (as_this->end > as->start)
 447                         break;
 448
 449                 if (as_next->start >= as->end) {
 450                         list_add(&as->host_list, lh);
 451                         list_add_tail(&as->hl_list, &hl->addr_list);
 452                         retval = 1;
 453                         break;
 454                 }
 455         }
 456         write_unlock_irqrestore(&addr_space_lock, flags);
 457
 458         if (retval == 0)
 459                 kfree(as);
 460         return retval;
 461 }
 462
 463 int hpsb_unregister_addrspace(struct hpsb_highlevel *hl, struct hpsb_host *host,
 464                               u64 start)
 465 {
 466         int retval = 0;
 467         struct hpsb_address_serve *as;
 468         struct list_head *lh, *next;
 469         unsigned long flags;
 470
 471         write_lock_irqsave(&addr_space_lock, flags);
 472         list_for_each_safe (lh, next, &hl->addr_list) {
 473                 as = list_entry(lh, struct hpsb_address_serve, hl_list);
 474                 if (as->start == start && as->host == host) {
 475                         __delete_addr(as);
 476                         retval = 1;
 477                         break;
 478                 }
 479         }
 480         write_unlock_irqrestore(&addr_space_lock, flags);
 481         return retval;
 482 }
 483
 484 static void init_hpsb_highlevel(struct hpsb_host *host)
 485 {
 486         INIT_LIST_HEAD(&dummy_zero_addr.host_list);
 487         INIT_LIST_HEAD(&dummy_zero_addr.hl_list);
 488         INIT_LIST_HEAD(&dummy_max_addr.host_list);
 489         INIT_LIST_HEAD(&dummy_max_addr.hl_list);
 490
 491         dummy_zero_addr.op = dummy_max_addr.op = &dummy_ops;
 492
 493         dummy_zero_addr.start = dummy_zero_addr.end = 0;
 494         dummy_max_addr.start = dummy_max_addr.end = ((u64) 1) << 48;
 495
 496         list_add_tail(&dummy_zero_addr.host_list, &host->addr_space);
 497         list_add_tail(&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 }