1 // SPDX-License-Identifier: GPL-2.0 2 /* Shared Memory Communications Direct over ISM devices (SMC-D) 3 * 4 * Functions for ISM device. 5 * 6 * Copyright IBM Corp. 2018 7 */ 8 9 #include <linux/if_vlan.h> 10 #include <linux/spinlock.h> 11 #include <linux/mutex.h> 12 #include <linux/slab.h> 13 #include <asm/page.h> 14 15 #include "smc.h" 16 #include "smc_core.h" 17 #include "smc_ism.h" 18 #include "smc_pnet.h" 19 #include "smc_netlink.h" 20 #include "linux/dibs.h" 21 22 struct smcd_dev_list smcd_dev_list = { 23 .list = LIST_HEAD_INIT(smcd_dev_list.list), 24 .mutex = __MUTEX_INITIALIZER(smcd_dev_list.mutex) 25 }; 26 27 static bool smc_ism_v2_capable; 28 static u8 smc_ism_v2_system_eid[SMC_MAX_EID_LEN]; 29 30 static void smcd_register_dev(struct dibs_dev *dibs); 31 static void smcd_unregister_dev(struct dibs_dev *dibs); 32 static void smcd_handle_event(struct dibs_dev *dibs, 33 const struct dibs_event *event); 34 static void smcd_handle_irq(struct dibs_dev *dibs, unsigned int dmbno, 35 u16 dmbemask); 36 37 static struct dibs_client_ops smc_client_ops = { 38 .add_dev = smcd_register_dev, 39 .del_dev = smcd_unregister_dev, 40 .handle_event = smcd_handle_event, 41 .handle_irq = smcd_handle_irq, 42 }; 43 44 static struct dibs_client smc_dibs_client = { 45 .name = "SMC-D", 46 .ops = &smc_client_ops, 47 }; 48 49 static void smc_ism_create_system_eid(void) 50 { 51 struct smc_ism_seid *seid = 52 (struct smc_ism_seid *)smc_ism_v2_system_eid; 53 #if IS_ENABLED(CONFIG_S390) 54 struct cpuid id; 55 u16 ident_tail; 56 char tmp[5]; 57 58 memcpy(seid->seid_string, "IBM-SYSZ-ISMSEID00000000", 24); 59 get_cpu_id(&id); 60 ident_tail = (u16)(id.ident & SMC_ISM_IDENT_MASK); 61 snprintf(tmp, 5, "%04X", ident_tail); 62 memcpy(seid->serial_number, tmp, 4); 63 snprintf(tmp, 5, "%04X", id.machine); 64 memcpy(seid->type, tmp, 4); 65 #else 66 memset(seid, 0, SMC_MAX_EID_LEN); 67 #endif 68 } 69 70 /* Test if an ISM communication is possible - same CPC */ 71 int smc_ism_cantalk(struct smcd_gid *peer_gid, unsigned short vlan_id, 72 struct smcd_dev *smcd) 73 { 74 struct dibs_dev *dibs = smcd->dibs; 75 uuid_t ism_rgid; 76 77 copy_to_dibsgid(&ism_rgid, peer_gid); 78 return dibs->ops->query_remote_gid(dibs, &ism_rgid, vlan_id ? 1 : 0, 79 vlan_id); 80 } 81 82 void smc_ism_get_system_eid(u8 **eid) 83 { 84 if (!smc_ism_v2_capable) 85 *eid = NULL; 86 else 87 *eid = smc_ism_v2_system_eid; 88 } 89 90 u16 smc_ism_get_chid(struct smcd_dev *smcd) 91 { 92 return smcd->dibs->ops->get_fabric_id(smcd->dibs); 93 } 94 95 /* HW supports ISM V2 and thus System EID is defined */ 96 bool smc_ism_is_v2_capable(void) 97 { 98 return smc_ism_v2_capable; 99 } 100 101 void smc_ism_set_v2_capable(void) 102 { 103 smc_ism_v2_capable = true; 104 } 105 106 /* Set a connection using this DMBE. */ 107 void smc_ism_set_conn(struct smc_connection *conn) 108 { 109 unsigned long flags; 110 111 spin_lock_irqsave(&conn->lgr->smcd->lock, flags); 112 conn->lgr->smcd->conn[conn->rmb_desc->sba_idx] = conn; 113 spin_unlock_irqrestore(&conn->lgr->smcd->lock, flags); 114 } 115 116 /* Unset a connection using this DMBE. */ 117 void smc_ism_unset_conn(struct smc_connection *conn) 118 { 119 unsigned long flags; 120 121 if (!conn->rmb_desc) 122 return; 123 124 spin_lock_irqsave(&conn->lgr->smcd->lock, flags); 125 conn->lgr->smcd->conn[conn->rmb_desc->sba_idx] = NULL; 126 spin_unlock_irqrestore(&conn->lgr->smcd->lock, flags); 127 } 128 129 /* Register a VLAN identifier with the ISM device. Use a reference count 130 * and add a VLAN identifier only when the first DMB using this VLAN is 131 * registered. 132 */ 133 int smc_ism_get_vlan(struct smcd_dev *smcd, unsigned short vlanid) 134 { 135 struct smc_ism_vlanid *new_vlan, *vlan; 136 unsigned long flags; 137 int rc = 0; 138 139 if (!vlanid) /* No valid vlan id */ 140 return -EINVAL; 141 if (!smcd->dibs->ops->add_vlan_id) 142 return -EOPNOTSUPP; 143 144 /* create new vlan entry, in case we need it */ 145 new_vlan = kzalloc(sizeof(*new_vlan), GFP_KERNEL); 146 if (!new_vlan) 147 return -ENOMEM; 148 new_vlan->vlanid = vlanid; 149 refcount_set(&new_vlan->refcnt, 1); 150 151 /* if there is an existing entry, increase count and return */ 152 spin_lock_irqsave(&smcd->lock, flags); 153 list_for_each_entry(vlan, &smcd->vlan, list) { 154 if (vlan->vlanid == vlanid) { 155 refcount_inc(&vlan->refcnt); 156 kfree(new_vlan); 157 goto out; 158 } 159 } 160 161 /* no existing entry found. 162 * add new entry to device; might fail, e.g., if HW limit reached 163 */ 164 if (smcd->dibs->ops->add_vlan_id(smcd->dibs, vlanid)) { 165 kfree(new_vlan); 166 rc = -EIO; 167 goto out; 168 } 169 list_add_tail(&new_vlan->list, &smcd->vlan); 170 out: 171 spin_unlock_irqrestore(&smcd->lock, flags); 172 return rc; 173 } 174 175 /* Unregister a VLAN identifier with the ISM device. Use a reference count 176 * and remove a VLAN identifier only when the last DMB using this VLAN is 177 * unregistered. 178 */ 179 int smc_ism_put_vlan(struct smcd_dev *smcd, unsigned short vlanid) 180 { 181 struct smc_ism_vlanid *vlan; 182 unsigned long flags; 183 bool found = false; 184 int rc = 0; 185 186 if (!vlanid) /* No valid vlan id */ 187 return -EINVAL; 188 if (!smcd->dibs->ops->del_vlan_id) 189 return -EOPNOTSUPP; 190 191 spin_lock_irqsave(&smcd->lock, flags); 192 list_for_each_entry(vlan, &smcd->vlan, list) { 193 if (vlan->vlanid == vlanid) { 194 if (!refcount_dec_and_test(&vlan->refcnt)) 195 goto out; 196 found = true; 197 break; 198 } 199 } 200 if (!found) { 201 rc = -ENOENT; 202 goto out; /* VLAN id not in table */ 203 } 204 205 /* Found and the last reference just gone */ 206 if (smcd->dibs->ops->del_vlan_id(smcd->dibs, vlanid)) 207 rc = -EIO; 208 list_del(&vlan->list); 209 kfree(vlan); 210 out: 211 spin_unlock_irqrestore(&smcd->lock, flags); 212 return rc; 213 } 214 215 void smc_ism_unregister_dmb(struct smcd_dev *smcd, 216 struct smc_buf_desc *dmb_desc) 217 { 218 struct dibs_dmb dmb; 219 220 if (!dmb_desc->dma_addr) 221 return; 222 223 memset(&dmb, 0, sizeof(dmb)); 224 dmb.dmb_tok = dmb_desc->token; 225 dmb.idx = dmb_desc->sba_idx; 226 dmb.cpu_addr = dmb_desc->cpu_addr; 227 dmb.dma_addr = dmb_desc->dma_addr; 228 dmb.dmb_len = dmb_desc->len; 229 230 smcd->dibs->ops->unregister_dmb(smcd->dibs, &dmb); 231 232 return; 233 } 234 235 int smc_ism_register_dmb(struct smc_link_group *lgr, int dmb_len, 236 struct smc_buf_desc *dmb_desc) 237 { 238 struct dibs_dev *dibs; 239 struct dibs_dmb dmb; 240 int rc; 241 242 memset(&dmb, 0, sizeof(dmb)); 243 dmb.dmb_len = dmb_len; 244 dmb.idx = dmb_desc->sba_idx; 245 dmb.vlan_id = lgr->vlan_id; 246 copy_to_dibsgid(&dmb.rgid, &lgr->peer_gid); 247 248 dibs = lgr->smcd->dibs; 249 rc = dibs->ops->register_dmb(dibs, &dmb, &smc_dibs_client); 250 if (!rc) { 251 dmb_desc->sba_idx = dmb.idx; 252 dmb_desc->token = dmb.dmb_tok; 253 dmb_desc->cpu_addr = dmb.cpu_addr; 254 dmb_desc->dma_addr = dmb.dma_addr; 255 dmb_desc->len = dmb.dmb_len; 256 } 257 return rc; 258 } 259 260 bool smc_ism_support_dmb_nocopy(struct smcd_dev *smcd) 261 { 262 /* for now only loopback-ism supports 263 * merging sndbuf with peer DMB to avoid 264 * data copies between them. 265 */ 266 return (smcd->dibs->ops->support_mmapped_rdmb && 267 smcd->dibs->ops->support_mmapped_rdmb(smcd->dibs)); 268 } 269 270 int smc_ism_attach_dmb(struct smcd_dev *dev, u64 token, 271 struct smc_buf_desc *dmb_desc) 272 { 273 struct dibs_dmb dmb; 274 int rc = 0; 275 276 if (!dev->dibs->ops->attach_dmb) 277 return -EINVAL; 278 279 memset(&dmb, 0, sizeof(dmb)); 280 dmb.dmb_tok = token; 281 rc = dev->dibs->ops->attach_dmb(dev->dibs, &dmb); 282 if (!rc) { 283 dmb_desc->sba_idx = dmb.idx; 284 dmb_desc->token = dmb.dmb_tok; 285 dmb_desc->cpu_addr = dmb.cpu_addr; 286 dmb_desc->dma_addr = dmb.dma_addr; 287 dmb_desc->len = dmb.dmb_len; 288 dmb_desc->is_attached = true; 289 } 290 return rc; 291 } 292 293 int smc_ism_detach_dmb(struct smcd_dev *dev, u64 token) 294 { 295 if (!dev->dibs->ops->detach_dmb) 296 return -EINVAL; 297 298 return dev->dibs->ops->detach_dmb(dev->dibs, token); 299 } 300 301 static int smc_nl_handle_smcd_dev(struct smcd_dev *smcd, 302 struct sk_buff *skb, 303 struct netlink_callback *cb) 304 { 305 char smc_pnet[SMC_MAX_PNETID_LEN + 1]; 306 struct smc_pci_dev smc_pci_dev; 307 struct nlattr *port_attrs; 308 struct dibs_dev *dibs; 309 struct nlattr *attrs; 310 int use_cnt = 0; 311 void *nlh; 312 313 dibs = smcd->dibs; 314 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 315 &smc_gen_nl_family, NLM_F_MULTI, 316 SMC_NETLINK_GET_DEV_SMCD); 317 if (!nlh) 318 goto errmsg; 319 attrs = nla_nest_start(skb, SMC_GEN_DEV_SMCD); 320 if (!attrs) 321 goto errout; 322 use_cnt = atomic_read(&smcd->lgr_cnt); 323 if (nla_put_u32(skb, SMC_NLA_DEV_USE_CNT, use_cnt)) 324 goto errattr; 325 if (nla_put_u8(skb, SMC_NLA_DEV_IS_CRIT, use_cnt > 0)) 326 goto errattr; 327 memset(&smc_pci_dev, 0, sizeof(smc_pci_dev)); 328 smc_set_pci_values(to_pci_dev(dibs->dev.parent), &smc_pci_dev); 329 if (nla_put_u32(skb, SMC_NLA_DEV_PCI_FID, smc_pci_dev.pci_fid)) 330 goto errattr; 331 if (nla_put_u16(skb, SMC_NLA_DEV_PCI_CHID, smc_pci_dev.pci_pchid)) 332 goto errattr; 333 if (nla_put_u16(skb, SMC_NLA_DEV_PCI_VENDOR, smc_pci_dev.pci_vendor)) 334 goto errattr; 335 if (nla_put_u16(skb, SMC_NLA_DEV_PCI_DEVICE, smc_pci_dev.pci_device)) 336 goto errattr; 337 if (nla_put_string(skb, SMC_NLA_DEV_PCI_ID, smc_pci_dev.pci_id)) 338 goto errattr; 339 340 port_attrs = nla_nest_start(skb, SMC_NLA_DEV_PORT); 341 if (!port_attrs) 342 goto errattr; 343 if (nla_put_u8(skb, SMC_NLA_DEV_PORT_PNET_USR, smcd->pnetid_by_user)) 344 goto errportattr; 345 memcpy(smc_pnet, smcd->pnetid, SMC_MAX_PNETID_LEN); 346 smc_pnet[SMC_MAX_PNETID_LEN] = 0; 347 if (nla_put_string(skb, SMC_NLA_DEV_PORT_PNETID, smc_pnet)) 348 goto errportattr; 349 350 nla_nest_end(skb, port_attrs); 351 nla_nest_end(skb, attrs); 352 genlmsg_end(skb, nlh); 353 return 0; 354 355 errportattr: 356 nla_nest_cancel(skb, port_attrs); 357 errattr: 358 nla_nest_cancel(skb, attrs); 359 errout: 360 nlmsg_cancel(skb, nlh); 361 errmsg: 362 return -EMSGSIZE; 363 } 364 365 static void smc_nl_prep_smcd_dev(struct smcd_dev_list *dev_list, 366 struct sk_buff *skb, 367 struct netlink_callback *cb) 368 { 369 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 370 int snum = cb_ctx->pos[0]; 371 struct smcd_dev *smcd; 372 int num = 0; 373 374 mutex_lock(&dev_list->mutex); 375 list_for_each_entry(smcd, &dev_list->list, list) { 376 if (num < snum) 377 goto next; 378 if (smc_ism_is_loopback(smcd->dibs)) 379 goto next; 380 if (smc_nl_handle_smcd_dev(smcd, skb, cb)) 381 goto errout; 382 next: 383 num++; 384 } 385 errout: 386 mutex_unlock(&dev_list->mutex); 387 cb_ctx->pos[0] = num; 388 } 389 390 int smcd_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb) 391 { 392 smc_nl_prep_smcd_dev(&smcd_dev_list, skb, cb); 393 return skb->len; 394 } 395 396 struct smc_ism_event_work { 397 struct work_struct work; 398 struct smcd_dev *smcd; 399 struct dibs_event event; 400 }; 401 402 #define ISM_EVENT_REQUEST 0x0001 403 #define ISM_EVENT_RESPONSE 0x0002 404 #define ISM_EVENT_REQUEST_IR 0x00000001 405 #define ISM_EVENT_CODE_SHUTDOWN 0x80 406 #define ISM_EVENT_CODE_TESTLINK 0x83 407 408 union smcd_sw_event_info { 409 u64 info; 410 struct { 411 u8 uid[SMC_LGR_ID_SIZE]; 412 unsigned short vlan_id; 413 u16 code; 414 }; 415 }; 416 417 static void smcd_handle_sw_event(struct smc_ism_event_work *wrk) 418 { 419 struct dibs_dev *dibs = wrk->smcd->dibs; 420 union smcd_sw_event_info ev_info; 421 struct smcd_gid peer_gid; 422 uuid_t ism_rgid; 423 424 copy_to_smcdgid(&peer_gid, &wrk->event.gid); 425 ev_info.info = wrk->event.data; 426 switch (wrk->event.subtype) { 427 case ISM_EVENT_CODE_SHUTDOWN: /* Peer shut down DMBs */ 428 smc_smcd_terminate(wrk->smcd, &peer_gid, ev_info.vlan_id); 429 break; 430 case ISM_EVENT_CODE_TESTLINK: /* Activity timer */ 431 if (ev_info.code == ISM_EVENT_REQUEST && 432 dibs->ops->signal_event) { 433 ev_info.code = ISM_EVENT_RESPONSE; 434 copy_to_dibsgid(&ism_rgid, &peer_gid); 435 dibs->ops->signal_event(dibs, &ism_rgid, 436 ISM_EVENT_REQUEST_IR, 437 ISM_EVENT_CODE_TESTLINK, 438 ev_info.info); 439 } 440 break; 441 } 442 } 443 444 /* worker for SMC-D events */ 445 static void smc_ism_event_work(struct work_struct *work) 446 { 447 struct smc_ism_event_work *wrk = 448 container_of(work, struct smc_ism_event_work, work); 449 struct smcd_gid smcd_gid; 450 451 copy_to_smcdgid(&smcd_gid, &wrk->event.gid); 452 453 switch (wrk->event.type) { 454 case DIBS_DEV_EVENT: /* GID event, token is peer GID */ 455 smc_smcd_terminate(wrk->smcd, &smcd_gid, VLAN_VID_MASK); 456 break; 457 case DIBS_BUF_EVENT: 458 break; 459 case DIBS_SW_EVENT: /* Software defined event */ 460 smcd_handle_sw_event(wrk); 461 break; 462 } 463 kfree(wrk); 464 } 465 466 static struct smcd_dev *smcd_alloc_dev(const char *name, int max_dmbs) 467 { 468 struct smcd_dev *smcd; 469 470 smcd = kzalloc(sizeof(*smcd), GFP_KERNEL); 471 if (!smcd) 472 return NULL; 473 smcd->conn = kcalloc(max_dmbs, sizeof(struct smc_connection *), 474 GFP_KERNEL); 475 if (!smcd->conn) 476 goto free_smcd; 477 478 smcd->event_wq = alloc_ordered_workqueue("ism_evt_wq-%s)", 479 WQ_MEM_RECLAIM, name); 480 if (!smcd->event_wq) 481 goto free_conn; 482 483 spin_lock_init(&smcd->lock); 484 spin_lock_init(&smcd->lgr_lock); 485 INIT_LIST_HEAD(&smcd->vlan); 486 INIT_LIST_HEAD(&smcd->lgr_list); 487 init_waitqueue_head(&smcd->lgrs_deleted); 488 return smcd; 489 490 free_conn: 491 kfree(smcd->conn); 492 free_smcd: 493 kfree(smcd); 494 return NULL; 495 } 496 497 static void smcd_register_dev(struct dibs_dev *dibs) 498 { 499 struct smcd_dev *smcd, *fentry; 500 int max_dmbs; 501 502 max_dmbs = dibs->ops->max_dmbs(); 503 504 smcd = smcd_alloc_dev(dev_name(&dibs->dev), max_dmbs); 505 if (!smcd) 506 return; 507 508 smcd->dibs = dibs; 509 dibs_set_priv(dibs, &smc_dibs_client, smcd); 510 511 if (smc_pnetid_by_dev_port(dibs->dev.parent, 0, smcd->pnetid)) 512 smc_pnetid_by_table_smcd(smcd); 513 514 if (smc_ism_is_loopback(dibs) || 515 (dibs->ops->add_vlan_id && 516 !dibs->ops->add_vlan_id(dibs, ISM_RESERVED_VLANID))) { 517 smc_ism_set_v2_capable(); 518 } 519 520 mutex_lock(&smcd_dev_list.mutex); 521 /* sort list: 522 * - devices without pnetid before devices with pnetid; 523 * - loopback-ism always at the very beginning; 524 */ 525 if (!smcd->pnetid[0]) { 526 fentry = list_first_entry_or_null(&smcd_dev_list.list, 527 struct smcd_dev, list); 528 if (fentry && smc_ism_is_loopback(fentry->dibs)) 529 list_add(&smcd->list, &fentry->list); 530 else 531 list_add(&smcd->list, &smcd_dev_list.list); 532 } else { 533 list_add_tail(&smcd->list, &smcd_dev_list.list); 534 } 535 mutex_unlock(&smcd_dev_list.mutex); 536 537 if (smc_pnet_is_pnetid_set(smcd->pnetid)) 538 pr_warn_ratelimited("smc: adding smcd device %s with pnetid %.16s%s\n", 539 dev_name(&dibs->dev), smcd->pnetid, 540 smcd->pnetid_by_user ? 541 " (user defined)" : 542 ""); 543 else 544 pr_warn_ratelimited("smc: adding smcd device %s without pnetid\n", 545 dev_name(&dibs->dev)); 546 return; 547 } 548 549 static void smcd_unregister_dev(struct dibs_dev *dibs) 550 { 551 struct smcd_dev *smcd = dibs_get_priv(dibs, &smc_dibs_client); 552 553 pr_warn_ratelimited("smc: removing smcd device %s\n", 554 dev_name(&dibs->dev)); 555 smcd->going_away = 1; 556 smc_smcd_terminate_all(smcd); 557 mutex_lock(&smcd_dev_list.mutex); 558 list_del_init(&smcd->list); 559 mutex_unlock(&smcd_dev_list.mutex); 560 destroy_workqueue(smcd->event_wq); 561 kfree(smcd->conn); 562 kfree(smcd); 563 } 564 565 /* SMCD Device event handler. Called from ISM device interrupt handler. 566 * Parameters are ism device pointer, 567 * - event->type (0 --> DMB, 1 --> GID), 568 * - event->code (event code), 569 * - event->tok (either DMB token when event type 0, or GID when event type 1) 570 * - event->time (time of day) 571 * - event->info (debug info). 572 * 573 * Context: 574 * - Function called in IRQ context from ISM device driver event handler. 575 */ 576 static void smcd_handle_event(struct dibs_dev *dibs, 577 const struct dibs_event *event) 578 { 579 struct smcd_dev *smcd = dibs_get_priv(dibs, &smc_dibs_client); 580 struct smc_ism_event_work *wrk; 581 582 if (smcd->going_away) 583 return; 584 /* copy event to event work queue, and let it be handled there */ 585 wrk = kmalloc(sizeof(*wrk), GFP_ATOMIC); 586 if (!wrk) 587 return; 588 INIT_WORK(&wrk->work, smc_ism_event_work); 589 wrk->smcd = smcd; 590 wrk->event = *event; 591 queue_work(smcd->event_wq, &wrk->work); 592 } 593 594 /* SMCD Device interrupt handler. Called from ISM device interrupt handler. 595 * Parameters are the ism device pointer, DMB number, and the DMBE bitmask. 596 * Find the connection and schedule the tasklet for this connection. 597 * 598 * Context: 599 * - Function called in IRQ context from ISM device driver IRQ handler. 600 */ 601 static void smcd_handle_irq(struct dibs_dev *dibs, unsigned int dmbno, 602 u16 dmbemask) 603 { 604 struct smcd_dev *smcd = dibs_get_priv(dibs, &smc_dibs_client); 605 struct smc_connection *conn = NULL; 606 unsigned long flags; 607 608 spin_lock_irqsave(&smcd->lock, flags); 609 conn = smcd->conn[dmbno]; 610 if (conn && !conn->killed) 611 tasklet_schedule(&conn->rx_tsklet); 612 spin_unlock_irqrestore(&smcd->lock, flags); 613 } 614 615 int smc_ism_signal_shutdown(struct smc_link_group *lgr) 616 { 617 int rc = 0; 618 union smcd_sw_event_info ev_info; 619 uuid_t ism_rgid; 620 621 if (lgr->peer_shutdown) 622 return 0; 623 if (!lgr->smcd->dibs->ops->signal_event) 624 return 0; 625 626 memcpy(ev_info.uid, lgr->id, SMC_LGR_ID_SIZE); 627 ev_info.vlan_id = lgr->vlan_id; 628 ev_info.code = ISM_EVENT_REQUEST; 629 copy_to_dibsgid(&ism_rgid, &lgr->peer_gid); 630 rc = lgr->smcd->dibs->ops->signal_event(lgr->smcd->dibs, &ism_rgid, 631 ISM_EVENT_REQUEST_IR, 632 ISM_EVENT_CODE_SHUTDOWN, 633 ev_info.info); 634 return rc; 635 } 636 637 int smc_ism_init(void) 638 { 639 int rc = 0; 640 641 smc_ism_v2_capable = false; 642 smc_ism_create_system_eid(); 643 644 rc = dibs_register_client(&smc_dibs_client); 645 return rc; 646 } 647 648 void smc_ism_exit(void) 649 { 650 dibs_unregister_client(&smc_dibs_client); 651 } 652