1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ISM driver for s390. 4 * 5 * Copyright IBM Corp. 2018 6 */ 7 #define KMSG_COMPONENT "ism" 8 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 9 10 #include <linux/module.h> 11 #include <linux/types.h> 12 #include <linux/interrupt.h> 13 #include <linux/device.h> 14 #include <linux/pci.h> 15 #include <linux/err.h> 16 #include <linux/ctype.h> 17 #include <linux/processor.h> 18 19 #include "ism.h" 20 21 MODULE_DESCRIPTION("ISM driver for s390"); 22 MODULE_LICENSE("GPL"); 23 24 #define PCI_DEVICE_ID_IBM_ISM 0x04ED 25 #define DRV_NAME "ism" 26 27 static const struct pci_device_id ism_device_table[] = { 28 { PCI_VDEVICE(IBM, PCI_DEVICE_ID_IBM_ISM), 0 }, 29 { 0, } 30 }; 31 MODULE_DEVICE_TABLE(pci, ism_device_table); 32 33 static debug_info_t *ism_debug_info; 34 static const struct smcd_ops ism_ops; 35 36 #define NO_CLIENT 0xff /* must be >= MAX_CLIENTS */ 37 static struct ism_client *clients[MAX_CLIENTS]; /* use an array rather than */ 38 /* a list for fast mapping */ 39 static u8 max_client; 40 static DEFINE_SPINLOCK(clients_lock); 41 struct ism_dev_list { 42 struct list_head list; 43 struct mutex mutex; /* protects ism device list */ 44 }; 45 46 static struct ism_dev_list ism_dev_list = { 47 .list = LIST_HEAD_INIT(ism_dev_list.list), 48 .mutex = __MUTEX_INITIALIZER(ism_dev_list.mutex), 49 }; 50 51 int ism_register_client(struct ism_client *client) 52 { 53 struct ism_dev *ism; 54 unsigned long flags; 55 int i, rc = -ENOSPC; 56 57 mutex_lock(&ism_dev_list.mutex); 58 spin_lock_irqsave(&clients_lock, flags); 59 for (i = 0; i < MAX_CLIENTS; ++i) { 60 if (!clients[i]) { 61 clients[i] = client; 62 client->id = i; 63 if (i == max_client) 64 max_client++; 65 rc = 0; 66 break; 67 } 68 } 69 spin_unlock_irqrestore(&clients_lock, flags); 70 if (i < MAX_CLIENTS) { 71 /* initialize with all devices that we got so far */ 72 list_for_each_entry(ism, &ism_dev_list.list, list) { 73 ism->priv[i] = NULL; 74 client->add(ism); 75 } 76 } 77 mutex_unlock(&ism_dev_list.mutex); 78 79 return rc; 80 } 81 EXPORT_SYMBOL_GPL(ism_register_client); 82 83 int ism_unregister_client(struct ism_client *client) 84 { 85 struct ism_dev *ism; 86 unsigned long flags; 87 int rc = 0; 88 89 mutex_lock(&ism_dev_list.mutex); 90 spin_lock_irqsave(&clients_lock, flags); 91 clients[client->id] = NULL; 92 if (client->id + 1 == max_client) 93 max_client--; 94 spin_unlock_irqrestore(&clients_lock, flags); 95 list_for_each_entry(ism, &ism_dev_list.list, list) { 96 for (int i = 0; i < ISM_NR_DMBS; ++i) { 97 if (ism->sba_client_arr[i] == client->id) { 98 pr_err("%s: attempt to unregister client '%s'" 99 "with registered dmb(s)\n", __func__, 100 client->name); 101 rc = -EBUSY; 102 goto out; 103 } 104 } 105 } 106 out: 107 mutex_unlock(&ism_dev_list.mutex); 108 109 return rc; 110 } 111 EXPORT_SYMBOL_GPL(ism_unregister_client); 112 113 static int ism_cmd(struct ism_dev *ism, void *cmd) 114 { 115 struct ism_req_hdr *req = cmd; 116 struct ism_resp_hdr *resp = cmd; 117 118 __ism_write_cmd(ism, req + 1, sizeof(*req), req->len - sizeof(*req)); 119 __ism_write_cmd(ism, req, 0, sizeof(*req)); 120 121 WRITE_ONCE(resp->ret, ISM_ERROR); 122 123 __ism_read_cmd(ism, resp, 0, sizeof(*resp)); 124 if (resp->ret) { 125 debug_text_event(ism_debug_info, 0, "cmd failure"); 126 debug_event(ism_debug_info, 0, resp, sizeof(*resp)); 127 goto out; 128 } 129 __ism_read_cmd(ism, resp + 1, sizeof(*resp), resp->len - sizeof(*resp)); 130 out: 131 return resp->ret; 132 } 133 134 static int ism_cmd_simple(struct ism_dev *ism, u32 cmd_code) 135 { 136 union ism_cmd_simple cmd; 137 138 memset(&cmd, 0, sizeof(cmd)); 139 cmd.request.hdr.cmd = cmd_code; 140 cmd.request.hdr.len = sizeof(cmd.request); 141 142 return ism_cmd(ism, &cmd); 143 } 144 145 static int query_info(struct ism_dev *ism) 146 { 147 union ism_qi cmd; 148 149 memset(&cmd, 0, sizeof(cmd)); 150 cmd.request.hdr.cmd = ISM_QUERY_INFO; 151 cmd.request.hdr.len = sizeof(cmd.request); 152 153 if (ism_cmd(ism, &cmd)) 154 goto out; 155 156 debug_text_event(ism_debug_info, 3, "query info"); 157 debug_event(ism_debug_info, 3, &cmd.response, sizeof(cmd.response)); 158 out: 159 return 0; 160 } 161 162 static int register_sba(struct ism_dev *ism) 163 { 164 union ism_reg_sba cmd; 165 dma_addr_t dma_handle; 166 struct ism_sba *sba; 167 168 sba = dma_alloc_coherent(&ism->pdev->dev, PAGE_SIZE, &dma_handle, 169 GFP_KERNEL); 170 if (!sba) 171 return -ENOMEM; 172 173 memset(&cmd, 0, sizeof(cmd)); 174 cmd.request.hdr.cmd = ISM_REG_SBA; 175 cmd.request.hdr.len = sizeof(cmd.request); 176 cmd.request.sba = dma_handle; 177 178 if (ism_cmd(ism, &cmd)) { 179 dma_free_coherent(&ism->pdev->dev, PAGE_SIZE, sba, dma_handle); 180 return -EIO; 181 } 182 183 ism->sba = sba; 184 ism->sba_dma_addr = dma_handle; 185 186 return 0; 187 } 188 189 static int register_ieq(struct ism_dev *ism) 190 { 191 union ism_reg_ieq cmd; 192 dma_addr_t dma_handle; 193 struct ism_eq *ieq; 194 195 ieq = dma_alloc_coherent(&ism->pdev->dev, PAGE_SIZE, &dma_handle, 196 GFP_KERNEL); 197 if (!ieq) 198 return -ENOMEM; 199 200 memset(&cmd, 0, sizeof(cmd)); 201 cmd.request.hdr.cmd = ISM_REG_IEQ; 202 cmd.request.hdr.len = sizeof(cmd.request); 203 cmd.request.ieq = dma_handle; 204 cmd.request.len = sizeof(*ieq); 205 206 if (ism_cmd(ism, &cmd)) { 207 dma_free_coherent(&ism->pdev->dev, PAGE_SIZE, ieq, dma_handle); 208 return -EIO; 209 } 210 211 ism->ieq = ieq; 212 ism->ieq_idx = -1; 213 ism->ieq_dma_addr = dma_handle; 214 215 return 0; 216 } 217 218 static int unregister_sba(struct ism_dev *ism) 219 { 220 int ret; 221 222 if (!ism->sba) 223 return 0; 224 225 ret = ism_cmd_simple(ism, ISM_UNREG_SBA); 226 if (ret && ret != ISM_ERROR) 227 return -EIO; 228 229 dma_free_coherent(&ism->pdev->dev, PAGE_SIZE, 230 ism->sba, ism->sba_dma_addr); 231 232 ism->sba = NULL; 233 ism->sba_dma_addr = 0; 234 235 return 0; 236 } 237 238 static int unregister_ieq(struct ism_dev *ism) 239 { 240 int ret; 241 242 if (!ism->ieq) 243 return 0; 244 245 ret = ism_cmd_simple(ism, ISM_UNREG_IEQ); 246 if (ret && ret != ISM_ERROR) 247 return -EIO; 248 249 dma_free_coherent(&ism->pdev->dev, PAGE_SIZE, 250 ism->ieq, ism->ieq_dma_addr); 251 252 ism->ieq = NULL; 253 ism->ieq_dma_addr = 0; 254 255 return 0; 256 } 257 258 static int ism_read_local_gid(struct ism_dev *ism) 259 { 260 union ism_read_gid cmd; 261 int ret; 262 263 memset(&cmd, 0, sizeof(cmd)); 264 cmd.request.hdr.cmd = ISM_READ_GID; 265 cmd.request.hdr.len = sizeof(cmd.request); 266 267 ret = ism_cmd(ism, &cmd); 268 if (ret) 269 goto out; 270 271 ism->local_gid = cmd.response.gid; 272 out: 273 return ret; 274 } 275 276 static int ism_query_rgid(struct ism_dev *ism, u64 rgid, u32 vid_valid, 277 u32 vid) 278 { 279 union ism_query_rgid cmd; 280 281 memset(&cmd, 0, sizeof(cmd)); 282 cmd.request.hdr.cmd = ISM_QUERY_RGID; 283 cmd.request.hdr.len = sizeof(cmd.request); 284 285 cmd.request.rgid = rgid; 286 cmd.request.vlan_valid = vid_valid; 287 cmd.request.vlan_id = vid; 288 289 return ism_cmd(ism, &cmd); 290 } 291 292 static int smcd_query_rgid(struct smcd_dev *smcd, u64 rgid, u32 vid_valid, u32 vid) 293 { 294 return ism_query_rgid(smcd->priv, rgid, vid_valid, vid); 295 } 296 297 static void ism_free_dmb(struct ism_dev *ism, struct ism_dmb *dmb) 298 { 299 clear_bit(dmb->sba_idx, ism->sba_bitmap); 300 dma_free_coherent(&ism->pdev->dev, dmb->dmb_len, 301 dmb->cpu_addr, dmb->dma_addr); 302 } 303 304 static int ism_alloc_dmb(struct ism_dev *ism, struct ism_dmb *dmb) 305 { 306 unsigned long bit; 307 308 if (PAGE_ALIGN(dmb->dmb_len) > dma_get_max_seg_size(&ism->pdev->dev)) 309 return -EINVAL; 310 311 if (!dmb->sba_idx) { 312 bit = find_next_zero_bit(ism->sba_bitmap, ISM_NR_DMBS, 313 ISM_DMB_BIT_OFFSET); 314 if (bit == ISM_NR_DMBS) 315 return -ENOSPC; 316 317 dmb->sba_idx = bit; 318 } 319 if (dmb->sba_idx < ISM_DMB_BIT_OFFSET || 320 test_and_set_bit(dmb->sba_idx, ism->sba_bitmap)) 321 return -EINVAL; 322 323 dmb->cpu_addr = dma_alloc_coherent(&ism->pdev->dev, dmb->dmb_len, 324 &dmb->dma_addr, 325 GFP_KERNEL | __GFP_NOWARN | 326 __GFP_NOMEMALLOC | __GFP_NORETRY); 327 if (!dmb->cpu_addr) 328 clear_bit(dmb->sba_idx, ism->sba_bitmap); 329 330 return dmb->cpu_addr ? 0 : -ENOMEM; 331 } 332 333 int ism_register_dmb(struct ism_dev *ism, struct ism_dmb *dmb, 334 struct ism_client *client) 335 { 336 union ism_reg_dmb cmd; 337 int ret; 338 339 ret = ism_alloc_dmb(ism, dmb); 340 if (ret) 341 goto out; 342 343 memset(&cmd, 0, sizeof(cmd)); 344 cmd.request.hdr.cmd = ISM_REG_DMB; 345 cmd.request.hdr.len = sizeof(cmd.request); 346 347 cmd.request.dmb = dmb->dma_addr; 348 cmd.request.dmb_len = dmb->dmb_len; 349 cmd.request.sba_idx = dmb->sba_idx; 350 cmd.request.vlan_valid = dmb->vlan_valid; 351 cmd.request.vlan_id = dmb->vlan_id; 352 cmd.request.rgid = dmb->rgid; 353 354 ret = ism_cmd(ism, &cmd); 355 if (ret) { 356 ism_free_dmb(ism, dmb); 357 goto out; 358 } 359 dmb->dmb_tok = cmd.response.dmb_tok; 360 ism->sba_client_arr[dmb->sba_idx - ISM_DMB_BIT_OFFSET] = client->id; 361 out: 362 return ret; 363 } 364 EXPORT_SYMBOL_GPL(ism_register_dmb); 365 366 static int smcd_register_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb) 367 { 368 return ism_register_dmb(smcd->priv, (struct ism_dmb *)dmb, NULL); 369 } 370 371 int ism_unregister_dmb(struct ism_dev *ism, struct ism_dmb *dmb) 372 { 373 union ism_unreg_dmb cmd; 374 int ret; 375 376 memset(&cmd, 0, sizeof(cmd)); 377 cmd.request.hdr.cmd = ISM_UNREG_DMB; 378 cmd.request.hdr.len = sizeof(cmd.request); 379 380 cmd.request.dmb_tok = dmb->dmb_tok; 381 382 ism->sba_client_arr[dmb->sba_idx - ISM_DMB_BIT_OFFSET] = NO_CLIENT; 383 384 ret = ism_cmd(ism, &cmd); 385 if (ret && ret != ISM_ERROR) 386 goto out; 387 388 ism_free_dmb(ism, dmb); 389 out: 390 return ret; 391 } 392 EXPORT_SYMBOL_GPL(ism_unregister_dmb); 393 394 static int smcd_unregister_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb) 395 { 396 return ism_unregister_dmb(smcd->priv, (struct ism_dmb *)dmb); 397 } 398 399 static int ism_add_vlan_id(struct ism_dev *ism, u64 vlan_id) 400 { 401 union ism_set_vlan_id cmd; 402 403 memset(&cmd, 0, sizeof(cmd)); 404 cmd.request.hdr.cmd = ISM_ADD_VLAN_ID; 405 cmd.request.hdr.len = sizeof(cmd.request); 406 407 cmd.request.vlan_id = vlan_id; 408 409 return ism_cmd(ism, &cmd); 410 } 411 412 static int smcd_add_vlan_id(struct smcd_dev *smcd, u64 vlan_id) 413 { 414 return ism_add_vlan_id(smcd->priv, vlan_id); 415 } 416 417 static int ism_del_vlan_id(struct ism_dev *ism, u64 vlan_id) 418 { 419 union ism_set_vlan_id cmd; 420 421 memset(&cmd, 0, sizeof(cmd)); 422 cmd.request.hdr.cmd = ISM_DEL_VLAN_ID; 423 cmd.request.hdr.len = sizeof(cmd.request); 424 425 cmd.request.vlan_id = vlan_id; 426 427 return ism_cmd(ism, &cmd); 428 } 429 430 static int smcd_del_vlan_id(struct smcd_dev *smcd, u64 vlan_id) 431 { 432 return ism_del_vlan_id(smcd->priv, vlan_id); 433 } 434 435 static int ism_set_vlan_required(struct smcd_dev *smcd) 436 { 437 return ism_cmd_simple(smcd->priv, ISM_SET_VLAN); 438 } 439 440 static int ism_reset_vlan_required(struct smcd_dev *smcd) 441 { 442 return ism_cmd_simple(smcd->priv, ISM_RESET_VLAN); 443 } 444 445 static int smcd_signal_ieq(struct smcd_dev *smcd, u64 rgid, u32 trigger_irq, 446 u32 event_code, u64 info) 447 { 448 struct ism_dev *ism = smcd->priv; 449 union ism_sig_ieq cmd; 450 451 memset(&cmd, 0, sizeof(cmd)); 452 cmd.request.hdr.cmd = ISM_SIGNAL_IEQ; 453 cmd.request.hdr.len = sizeof(cmd.request); 454 455 cmd.request.rgid = rgid; 456 cmd.request.trigger_irq = trigger_irq; 457 cmd.request.event_code = event_code; 458 cmd.request.info = info; 459 460 return ism_cmd(ism, &cmd); 461 } 462 463 static unsigned int max_bytes(unsigned int start, unsigned int len, 464 unsigned int boundary) 465 { 466 return min(boundary - (start & (boundary - 1)), len); 467 } 468 469 static int smcd_move(struct smcd_dev *smcd, u64 dmb_tok, unsigned int idx, 470 bool sf, unsigned int offset, void *data, 471 unsigned int size) 472 { 473 struct ism_dev *ism = smcd->priv; 474 unsigned int bytes; 475 u64 dmb_req; 476 int ret; 477 478 while (size) { 479 bytes = max_bytes(offset, size, PAGE_SIZE); 480 dmb_req = ISM_CREATE_REQ(dmb_tok, idx, size == bytes ? sf : 0, 481 offset); 482 483 ret = __ism_move(ism, dmb_req, data, bytes); 484 if (ret) 485 return ret; 486 487 size -= bytes; 488 data += bytes; 489 offset += bytes; 490 } 491 492 return 0; 493 } 494 495 static struct ism_systemeid SYSTEM_EID = { 496 .seid_string = "IBM-SYSZ-ISMSEID00000000", 497 .serial_number = "0000", 498 .type = "0000", 499 }; 500 501 static void ism_create_system_eid(void) 502 { 503 struct cpuid id; 504 u16 ident_tail; 505 char tmp[5]; 506 507 get_cpu_id(&id); 508 ident_tail = (u16)(id.ident & ISM_IDENT_MASK); 509 snprintf(tmp, 5, "%04X", ident_tail); 510 memcpy(&SYSTEM_EID.serial_number, tmp, 4); 511 snprintf(tmp, 5, "%04X", id.machine); 512 memcpy(&SYSTEM_EID.type, tmp, 4); 513 } 514 515 u8 *ism_get_seid(void) 516 { 517 return SYSTEM_EID.seid_string; 518 } 519 EXPORT_SYMBOL_GPL(ism_get_seid); 520 521 static u16 smcd_get_chid(struct smcd_dev *smcd) 522 { 523 struct ism_dev *ism = smcd->priv; 524 525 if (!ism || !ism->pdev) 526 return 0; 527 528 return to_zpci(ism->pdev)->pchid; 529 } 530 531 static void ism_handle_event(struct ism_dev *ism) 532 { 533 struct ism_event *entry; 534 int i; 535 536 while ((ism->ieq_idx + 1) != READ_ONCE(ism->ieq->header.idx)) { 537 if (++(ism->ieq_idx) == ARRAY_SIZE(ism->ieq->entry)) 538 ism->ieq_idx = 0; 539 540 entry = &ism->ieq->entry[ism->ieq_idx]; 541 debug_event(ism_debug_info, 2, entry, sizeof(*entry)); 542 spin_lock(&clients_lock); 543 for (i = 0; i < max_client; ++i) 544 if (clients[i]) 545 clients[i]->handle_event(ism, entry); 546 spin_unlock(&clients_lock); 547 } 548 } 549 550 static irqreturn_t ism_handle_irq(int irq, void *data) 551 { 552 struct ism_dev *ism = data; 553 struct ism_client *clt; 554 unsigned long bit, end; 555 unsigned long *bv; 556 u16 dmbemask; 557 558 bv = (void *) &ism->sba->dmb_bits[ISM_DMB_WORD_OFFSET]; 559 end = sizeof(ism->sba->dmb_bits) * BITS_PER_BYTE - ISM_DMB_BIT_OFFSET; 560 561 spin_lock(&ism->lock); 562 ism->sba->s = 0; 563 barrier(); 564 for (bit = 0;;) { 565 bit = find_next_bit_inv(bv, end, bit); 566 if (bit >= end) 567 break; 568 569 clear_bit_inv(bit, bv); 570 dmbemask = ism->sba->dmbe_mask[bit + ISM_DMB_BIT_OFFSET]; 571 ism->sba->dmbe_mask[bit + ISM_DMB_BIT_OFFSET] = 0; 572 barrier(); 573 clt = clients[ism->sba_client_arr[bit]]; 574 clt->handle_irq(ism, bit + ISM_DMB_BIT_OFFSET, dmbemask); 575 } 576 577 if (ism->sba->e) { 578 ism->sba->e = 0; 579 barrier(); 580 ism_handle_event(ism); 581 } 582 spin_unlock(&ism->lock); 583 return IRQ_HANDLED; 584 } 585 586 static u64 smcd_get_local_gid(struct smcd_dev *smcd) 587 { 588 struct ism_dev *ism = smcd->priv; 589 590 return ism->local_gid; 591 } 592 593 static const struct smcd_ops ism_ops = { 594 .query_remote_gid = smcd_query_rgid, 595 .register_dmb = smcd_register_dmb, 596 .unregister_dmb = smcd_unregister_dmb, 597 .add_vlan_id = smcd_add_vlan_id, 598 .del_vlan_id = smcd_del_vlan_id, 599 .set_vlan_required = ism_set_vlan_required, 600 .reset_vlan_required = ism_reset_vlan_required, 601 .signal_event = smcd_signal_ieq, 602 .move_data = smcd_move, 603 .get_system_eid = ism_get_seid, 604 .get_local_gid = smcd_get_local_gid, 605 .get_chid = smcd_get_chid, 606 }; 607 608 static void ism_dev_add_work_func(struct work_struct *work) 609 { 610 struct ism_client *client = container_of(work, struct ism_client, 611 add_work); 612 613 client->add(client->tgt_ism); 614 atomic_dec(&client->tgt_ism->add_dev_cnt); 615 wake_up(&client->tgt_ism->waitq); 616 } 617 618 static int ism_dev_init(struct ism_dev *ism) 619 { 620 struct pci_dev *pdev = ism->pdev; 621 unsigned long flags; 622 int i, ret; 623 624 ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI); 625 if (ret <= 0) 626 goto out; 627 628 ism->sba_client_arr = kzalloc(ISM_NR_DMBS, GFP_KERNEL); 629 if (!ism->sba_client_arr) 630 goto free_vectors; 631 memset(ism->sba_client_arr, NO_CLIENT, ISM_NR_DMBS); 632 633 ret = request_irq(pci_irq_vector(pdev, 0), ism_handle_irq, 0, 634 pci_name(pdev), ism); 635 if (ret) 636 goto free_client_arr; 637 638 ret = register_sba(ism); 639 if (ret) 640 goto free_irq; 641 642 ret = register_ieq(ism); 643 if (ret) 644 goto unreg_sba; 645 646 ret = ism_read_local_gid(ism); 647 if (ret) 648 goto unreg_ieq; 649 650 if (!ism_add_vlan_id(ism, ISM_RESERVED_VLANID)) 651 /* hardware is V2 capable */ 652 ism_create_system_eid(); 653 654 init_waitqueue_head(&ism->waitq); 655 atomic_set(&ism->free_clients_cnt, 0); 656 atomic_set(&ism->add_dev_cnt, 0); 657 658 wait_event(ism->waitq, !atomic_read(&ism->add_dev_cnt)); 659 spin_lock_irqsave(&clients_lock, flags); 660 for (i = 0; i < max_client; ++i) 661 if (clients[i]) { 662 INIT_WORK(&clients[i]->add_work, 663 ism_dev_add_work_func); 664 clients[i]->tgt_ism = ism; 665 atomic_inc(&ism->add_dev_cnt); 666 schedule_work(&clients[i]->add_work); 667 } 668 spin_unlock_irqrestore(&clients_lock, flags); 669 670 wait_event(ism->waitq, !atomic_read(&ism->add_dev_cnt)); 671 672 mutex_lock(&ism_dev_list.mutex); 673 list_add(&ism->list, &ism_dev_list.list); 674 mutex_unlock(&ism_dev_list.mutex); 675 676 query_info(ism); 677 return 0; 678 679 unreg_ieq: 680 unregister_ieq(ism); 681 unreg_sba: 682 unregister_sba(ism); 683 free_irq: 684 free_irq(pci_irq_vector(pdev, 0), ism); 685 free_client_arr: 686 kfree(ism->sba_client_arr); 687 free_vectors: 688 pci_free_irq_vectors(pdev); 689 out: 690 return ret; 691 } 692 693 static int ism_probe(struct pci_dev *pdev, const struct pci_device_id *id) 694 { 695 struct ism_dev *ism; 696 int ret; 697 698 ism = kzalloc(sizeof(*ism), GFP_KERNEL); 699 if (!ism) 700 return -ENOMEM; 701 702 spin_lock_init(&ism->lock); 703 dev_set_drvdata(&pdev->dev, ism); 704 ism->pdev = pdev; 705 706 ret = pci_enable_device_mem(pdev); 707 if (ret) 708 goto err; 709 710 ret = pci_request_mem_regions(pdev, DRV_NAME); 711 if (ret) 712 goto err_disable; 713 714 ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)); 715 if (ret) 716 goto err_resource; 717 718 dma_set_seg_boundary(&pdev->dev, SZ_1M - 1); 719 dma_set_max_seg_size(&pdev->dev, SZ_1M); 720 pci_set_master(pdev); 721 722 ism->smcd = smcd_alloc_dev(&pdev->dev, dev_name(&pdev->dev), &ism_ops, 723 ISM_NR_DMBS); 724 if (!ism->smcd) { 725 ret = -ENOMEM; 726 goto err_resource; 727 } 728 729 ism->smcd->priv = ism; 730 ret = ism_dev_init(ism); 731 if (ret) 732 goto err_free; 733 734 return 0; 735 736 err_free: 737 smcd_free_dev(ism->smcd); 738 err_resource: 739 pci_clear_master(pdev); 740 pci_release_mem_regions(pdev); 741 err_disable: 742 pci_disable_device(pdev); 743 err: 744 kfree(ism); 745 dev_set_drvdata(&pdev->dev, NULL); 746 return ret; 747 } 748 749 static void ism_dev_remove_work_func(struct work_struct *work) 750 { 751 struct ism_client *client = container_of(work, struct ism_client, 752 remove_work); 753 754 client->remove(client->tgt_ism); 755 atomic_dec(&client->tgt_ism->free_clients_cnt); 756 wake_up(&client->tgt_ism->waitq); 757 } 758 759 /* Callers must hold ism_dev_list.mutex */ 760 static void ism_dev_exit(struct ism_dev *ism) 761 { 762 struct pci_dev *pdev = ism->pdev; 763 unsigned long flags; 764 int i; 765 766 wait_event(ism->waitq, !atomic_read(&ism->free_clients_cnt)); 767 spin_lock_irqsave(&clients_lock, flags); 768 for (i = 0; i < max_client; ++i) 769 if (clients[i]) { 770 INIT_WORK(&clients[i]->remove_work, 771 ism_dev_remove_work_func); 772 clients[i]->tgt_ism = ism; 773 atomic_inc(&ism->free_clients_cnt); 774 schedule_work(&clients[i]->remove_work); 775 } 776 spin_unlock_irqrestore(&clients_lock, flags); 777 778 wait_event(ism->waitq, !atomic_read(&ism->free_clients_cnt)); 779 780 if (SYSTEM_EID.serial_number[0] != '0' || 781 SYSTEM_EID.type[0] != '0') 782 ism_del_vlan_id(ism, ISM_RESERVED_VLANID); 783 unregister_ieq(ism); 784 unregister_sba(ism); 785 free_irq(pci_irq_vector(pdev, 0), ism); 786 kfree(ism->sba_client_arr); 787 pci_free_irq_vectors(pdev); 788 list_del_init(&ism->list); 789 } 790 791 static void ism_remove(struct pci_dev *pdev) 792 { 793 struct ism_dev *ism = dev_get_drvdata(&pdev->dev); 794 795 mutex_lock(&ism_dev_list.mutex); 796 ism_dev_exit(ism); 797 mutex_unlock(&ism_dev_list.mutex); 798 799 smcd_free_dev(ism->smcd); 800 pci_clear_master(pdev); 801 pci_release_mem_regions(pdev); 802 pci_disable_device(pdev); 803 device_del(&ism->dev); 804 dev_set_drvdata(&pdev->dev, NULL); 805 kfree(ism); 806 } 807 808 static struct pci_driver ism_driver = { 809 .name = DRV_NAME, 810 .id_table = ism_device_table, 811 .probe = ism_probe, 812 .remove = ism_remove, 813 }; 814 815 static int __init ism_init(void) 816 { 817 int ret; 818 819 ism_debug_info = debug_register("ism", 2, 1, 16); 820 if (!ism_debug_info) 821 return -ENODEV; 822 823 memset(clients, 0, sizeof(clients)); 824 max_client = 0; 825 debug_register_view(ism_debug_info, &debug_hex_ascii_view); 826 ret = pci_register_driver(&ism_driver); 827 if (ret) 828 debug_unregister(ism_debug_info); 829 830 return ret; 831 } 832 833 static void __exit ism_exit(void) 834 { 835 struct ism_dev *ism; 836 837 mutex_lock(&ism_dev_list.mutex); 838 list_for_each_entry(ism, &ism_dev_list.list, list) { 839 ism_dev_exit(ism); 840 } 841 mutex_unlock(&ism_dev_list.mutex); 842 843 pci_unregister_driver(&ism_driver); 844 debug_unregister(ism_debug_info); 845 } 846 847 module_init(ism_init); 848 module_exit(ism_exit); 849