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/err.h> 15 #include <linux/ctype.h> 16 #include <linux/processor.h> 17 18 #include "ism.h" 19 20 MODULE_DESCRIPTION("ISM driver for s390"); 21 MODULE_LICENSE("GPL"); 22 23 #define PCI_DEVICE_ID_IBM_ISM 0x04ED 24 #define DRV_NAME "ism" 25 26 static const struct pci_device_id ism_device_table[] = { 27 { PCI_VDEVICE(IBM, PCI_DEVICE_ID_IBM_ISM), 0 }, 28 { 0, } 29 }; 30 MODULE_DEVICE_TABLE(pci, ism_device_table); 31 32 static debug_info_t *ism_debug_info; 33 static const struct smcd_ops ism_ops; 34 35 #define NO_CLIENT 0xff /* must be >= MAX_CLIENTS */ 36 static struct ism_client *clients[MAX_CLIENTS]; /* use an array rather than */ 37 /* a list for fast mapping */ 38 static u8 max_client; 39 static DEFINE_SPINLOCK(clients_lock); 40 struct ism_dev_list { 41 struct list_head list; 42 struct mutex mutex; /* protects ism device list */ 43 }; 44 45 static struct ism_dev_list ism_dev_list = { 46 .list = LIST_HEAD_INIT(ism_dev_list.list), 47 .mutex = __MUTEX_INITIALIZER(ism_dev_list.mutex), 48 }; 49 50 static void ism_setup_forwarding(struct ism_client *client, struct ism_dev *ism) 51 { 52 unsigned long flags; 53 54 spin_lock_irqsave(&ism->lock, flags); 55 ism->subs[client->id] = client; 56 spin_unlock_irqrestore(&ism->lock, flags); 57 } 58 59 int ism_register_client(struct ism_client *client) 60 { 61 struct ism_dev *ism; 62 unsigned long flags; 63 int i, rc = -ENOSPC; 64 65 mutex_lock(&ism_dev_list.mutex); 66 spin_lock_irqsave(&clients_lock, flags); 67 for (i = 0; i < MAX_CLIENTS; ++i) { 68 if (!clients[i]) { 69 clients[i] = client; 70 client->id = i; 71 if (i == max_client) 72 max_client++; 73 rc = 0; 74 break; 75 } 76 } 77 spin_unlock_irqrestore(&clients_lock, flags); 78 if (i < MAX_CLIENTS) { 79 /* initialize with all devices that we got so far */ 80 list_for_each_entry(ism, &ism_dev_list.list, list) { 81 ism->priv[i] = NULL; 82 client->add(ism); 83 ism_setup_forwarding(client, ism); 84 } 85 } 86 mutex_unlock(&ism_dev_list.mutex); 87 88 return rc; 89 } 90 EXPORT_SYMBOL_GPL(ism_register_client); 91 92 int ism_unregister_client(struct ism_client *client) 93 { 94 struct ism_dev *ism; 95 unsigned long flags; 96 int rc = 0; 97 98 mutex_lock(&ism_dev_list.mutex); 99 spin_lock_irqsave(&clients_lock, flags); 100 clients[client->id] = NULL; 101 if (client->id + 1 == max_client) 102 max_client--; 103 spin_unlock_irqrestore(&clients_lock, flags); 104 list_for_each_entry(ism, &ism_dev_list.list, list) { 105 spin_lock_irqsave(&ism->lock, flags); 106 /* Stop forwarding IRQs and events */ 107 ism->subs[client->id] = NULL; 108 for (int i = 0; i < ISM_NR_DMBS; ++i) { 109 if (ism->sba_client_arr[i] == client->id) { 110 pr_err("%s: attempt to unregister client '%s'" 111 "with registered dmb(s)\n", __func__, 112 client->name); 113 rc = -EBUSY; 114 goto out; 115 } 116 } 117 spin_unlock_irqrestore(&ism->lock, flags); 118 } 119 out: 120 mutex_unlock(&ism_dev_list.mutex); 121 122 return rc; 123 } 124 EXPORT_SYMBOL_GPL(ism_unregister_client); 125 126 static int ism_cmd(struct ism_dev *ism, void *cmd) 127 { 128 struct ism_req_hdr *req = cmd; 129 struct ism_resp_hdr *resp = cmd; 130 131 __ism_write_cmd(ism, req + 1, sizeof(*req), req->len - sizeof(*req)); 132 __ism_write_cmd(ism, req, 0, sizeof(*req)); 133 134 WRITE_ONCE(resp->ret, ISM_ERROR); 135 136 __ism_read_cmd(ism, resp, 0, sizeof(*resp)); 137 if (resp->ret) { 138 debug_text_event(ism_debug_info, 0, "cmd failure"); 139 debug_event(ism_debug_info, 0, resp, sizeof(*resp)); 140 goto out; 141 } 142 __ism_read_cmd(ism, resp + 1, sizeof(*resp), resp->len - sizeof(*resp)); 143 out: 144 return resp->ret; 145 } 146 147 static int ism_cmd_simple(struct ism_dev *ism, u32 cmd_code) 148 { 149 union ism_cmd_simple cmd; 150 151 memset(&cmd, 0, sizeof(cmd)); 152 cmd.request.hdr.cmd = cmd_code; 153 cmd.request.hdr.len = sizeof(cmd.request); 154 155 return ism_cmd(ism, &cmd); 156 } 157 158 static int query_info(struct ism_dev *ism) 159 { 160 union ism_qi cmd; 161 162 memset(&cmd, 0, sizeof(cmd)); 163 cmd.request.hdr.cmd = ISM_QUERY_INFO; 164 cmd.request.hdr.len = sizeof(cmd.request); 165 166 if (ism_cmd(ism, &cmd)) 167 goto out; 168 169 debug_text_event(ism_debug_info, 3, "query info"); 170 debug_event(ism_debug_info, 3, &cmd.response, sizeof(cmd.response)); 171 out: 172 return 0; 173 } 174 175 static int register_sba(struct ism_dev *ism) 176 { 177 union ism_reg_sba cmd; 178 dma_addr_t dma_handle; 179 struct ism_sba *sba; 180 181 sba = dma_alloc_coherent(&ism->pdev->dev, PAGE_SIZE, &dma_handle, 182 GFP_KERNEL); 183 if (!sba) 184 return -ENOMEM; 185 186 memset(&cmd, 0, sizeof(cmd)); 187 cmd.request.hdr.cmd = ISM_REG_SBA; 188 cmd.request.hdr.len = sizeof(cmd.request); 189 cmd.request.sba = dma_handle; 190 191 if (ism_cmd(ism, &cmd)) { 192 dma_free_coherent(&ism->pdev->dev, PAGE_SIZE, sba, dma_handle); 193 return -EIO; 194 } 195 196 ism->sba = sba; 197 ism->sba_dma_addr = dma_handle; 198 199 return 0; 200 } 201 202 static int register_ieq(struct ism_dev *ism) 203 { 204 union ism_reg_ieq cmd; 205 dma_addr_t dma_handle; 206 struct ism_eq *ieq; 207 208 ieq = dma_alloc_coherent(&ism->pdev->dev, PAGE_SIZE, &dma_handle, 209 GFP_KERNEL); 210 if (!ieq) 211 return -ENOMEM; 212 213 memset(&cmd, 0, sizeof(cmd)); 214 cmd.request.hdr.cmd = ISM_REG_IEQ; 215 cmd.request.hdr.len = sizeof(cmd.request); 216 cmd.request.ieq = dma_handle; 217 cmd.request.len = sizeof(*ieq); 218 219 if (ism_cmd(ism, &cmd)) { 220 dma_free_coherent(&ism->pdev->dev, PAGE_SIZE, ieq, dma_handle); 221 return -EIO; 222 } 223 224 ism->ieq = ieq; 225 ism->ieq_idx = -1; 226 ism->ieq_dma_addr = dma_handle; 227 228 return 0; 229 } 230 231 static int unregister_sba(struct ism_dev *ism) 232 { 233 int ret; 234 235 if (!ism->sba) 236 return 0; 237 238 ret = ism_cmd_simple(ism, ISM_UNREG_SBA); 239 if (ret && ret != ISM_ERROR) 240 return -EIO; 241 242 dma_free_coherent(&ism->pdev->dev, PAGE_SIZE, 243 ism->sba, ism->sba_dma_addr); 244 245 ism->sba = NULL; 246 ism->sba_dma_addr = 0; 247 248 return 0; 249 } 250 251 static int unregister_ieq(struct ism_dev *ism) 252 { 253 int ret; 254 255 if (!ism->ieq) 256 return 0; 257 258 ret = ism_cmd_simple(ism, ISM_UNREG_IEQ); 259 if (ret && ret != ISM_ERROR) 260 return -EIO; 261 262 dma_free_coherent(&ism->pdev->dev, PAGE_SIZE, 263 ism->ieq, ism->ieq_dma_addr); 264 265 ism->ieq = NULL; 266 ism->ieq_dma_addr = 0; 267 268 return 0; 269 } 270 271 static int ism_read_local_gid(struct ism_dev *ism) 272 { 273 union ism_read_gid cmd; 274 int ret; 275 276 memset(&cmd, 0, sizeof(cmd)); 277 cmd.request.hdr.cmd = ISM_READ_GID; 278 cmd.request.hdr.len = sizeof(cmd.request); 279 280 ret = ism_cmd(ism, &cmd); 281 if (ret) 282 goto out; 283 284 ism->local_gid = cmd.response.gid; 285 out: 286 return ret; 287 } 288 289 static int ism_query_rgid(struct ism_dev *ism, u64 rgid, u32 vid_valid, 290 u32 vid) 291 { 292 union ism_query_rgid cmd; 293 294 memset(&cmd, 0, sizeof(cmd)); 295 cmd.request.hdr.cmd = ISM_QUERY_RGID; 296 cmd.request.hdr.len = sizeof(cmd.request); 297 298 cmd.request.rgid = rgid; 299 cmd.request.vlan_valid = vid_valid; 300 cmd.request.vlan_id = vid; 301 302 return ism_cmd(ism, &cmd); 303 } 304 305 static void ism_free_dmb(struct ism_dev *ism, struct ism_dmb *dmb) 306 { 307 clear_bit(dmb->sba_idx, ism->sba_bitmap); 308 dma_free_coherent(&ism->pdev->dev, dmb->dmb_len, 309 dmb->cpu_addr, dmb->dma_addr); 310 } 311 312 static int ism_alloc_dmb(struct ism_dev *ism, struct ism_dmb *dmb) 313 { 314 unsigned long bit; 315 316 if (PAGE_ALIGN(dmb->dmb_len) > dma_get_max_seg_size(&ism->pdev->dev)) 317 return -EINVAL; 318 319 if (!dmb->sba_idx) { 320 bit = find_next_zero_bit(ism->sba_bitmap, ISM_NR_DMBS, 321 ISM_DMB_BIT_OFFSET); 322 if (bit == ISM_NR_DMBS) 323 return -ENOSPC; 324 325 dmb->sba_idx = bit; 326 } 327 if (dmb->sba_idx < ISM_DMB_BIT_OFFSET || 328 test_and_set_bit(dmb->sba_idx, ism->sba_bitmap)) 329 return -EINVAL; 330 331 dmb->cpu_addr = dma_alloc_coherent(&ism->pdev->dev, dmb->dmb_len, 332 &dmb->dma_addr, 333 GFP_KERNEL | __GFP_NOWARN | 334 __GFP_NOMEMALLOC | __GFP_NORETRY); 335 if (!dmb->cpu_addr) 336 clear_bit(dmb->sba_idx, ism->sba_bitmap); 337 338 return dmb->cpu_addr ? 0 : -ENOMEM; 339 } 340 341 int ism_register_dmb(struct ism_dev *ism, struct ism_dmb *dmb, 342 struct ism_client *client) 343 { 344 union ism_reg_dmb cmd; 345 unsigned long flags; 346 int ret; 347 348 ret = ism_alloc_dmb(ism, dmb); 349 if (ret) 350 goto out; 351 352 memset(&cmd, 0, sizeof(cmd)); 353 cmd.request.hdr.cmd = ISM_REG_DMB; 354 cmd.request.hdr.len = sizeof(cmd.request); 355 356 cmd.request.dmb = dmb->dma_addr; 357 cmd.request.dmb_len = dmb->dmb_len; 358 cmd.request.sba_idx = dmb->sba_idx; 359 cmd.request.vlan_valid = dmb->vlan_valid; 360 cmd.request.vlan_id = dmb->vlan_id; 361 cmd.request.rgid = dmb->rgid; 362 363 ret = ism_cmd(ism, &cmd); 364 if (ret) { 365 ism_free_dmb(ism, dmb); 366 goto out; 367 } 368 dmb->dmb_tok = cmd.response.dmb_tok; 369 spin_lock_irqsave(&ism->lock, flags); 370 ism->sba_client_arr[dmb->sba_idx - ISM_DMB_BIT_OFFSET] = client->id; 371 spin_unlock_irqrestore(&ism->lock, flags); 372 out: 373 return ret; 374 } 375 EXPORT_SYMBOL_GPL(ism_register_dmb); 376 377 int ism_unregister_dmb(struct ism_dev *ism, struct ism_dmb *dmb) 378 { 379 union ism_unreg_dmb cmd; 380 unsigned long flags; 381 int ret; 382 383 memset(&cmd, 0, sizeof(cmd)); 384 cmd.request.hdr.cmd = ISM_UNREG_DMB; 385 cmd.request.hdr.len = sizeof(cmd.request); 386 387 cmd.request.dmb_tok = dmb->dmb_tok; 388 389 spin_lock_irqsave(&ism->lock, flags); 390 ism->sba_client_arr[dmb->sba_idx - ISM_DMB_BIT_OFFSET] = NO_CLIENT; 391 spin_unlock_irqrestore(&ism->lock, flags); 392 393 ret = ism_cmd(ism, &cmd); 394 if (ret && ret != ISM_ERROR) 395 goto out; 396 397 ism_free_dmb(ism, dmb); 398 out: 399 return ret; 400 } 401 EXPORT_SYMBOL_GPL(ism_unregister_dmb); 402 403 static int ism_add_vlan_id(struct ism_dev *ism, u64 vlan_id) 404 { 405 union ism_set_vlan_id cmd; 406 407 memset(&cmd, 0, sizeof(cmd)); 408 cmd.request.hdr.cmd = ISM_ADD_VLAN_ID; 409 cmd.request.hdr.len = sizeof(cmd.request); 410 411 cmd.request.vlan_id = vlan_id; 412 413 return ism_cmd(ism, &cmd); 414 } 415 416 static int ism_del_vlan_id(struct ism_dev *ism, u64 vlan_id) 417 { 418 union ism_set_vlan_id cmd; 419 420 memset(&cmd, 0, sizeof(cmd)); 421 cmd.request.hdr.cmd = ISM_DEL_VLAN_ID; 422 cmd.request.hdr.len = sizeof(cmd.request); 423 424 cmd.request.vlan_id = vlan_id; 425 426 return ism_cmd(ism, &cmd); 427 } 428 429 static int ism_signal_ieq(struct ism_dev *ism, u64 rgid, u32 trigger_irq, 430 u32 event_code, u64 info) 431 { 432 union ism_sig_ieq cmd; 433 434 memset(&cmd, 0, sizeof(cmd)); 435 cmd.request.hdr.cmd = ISM_SIGNAL_IEQ; 436 cmd.request.hdr.len = sizeof(cmd.request); 437 438 cmd.request.rgid = rgid; 439 cmd.request.trigger_irq = trigger_irq; 440 cmd.request.event_code = event_code; 441 cmd.request.info = info; 442 443 return ism_cmd(ism, &cmd); 444 } 445 446 static unsigned int max_bytes(unsigned int start, unsigned int len, 447 unsigned int boundary) 448 { 449 return min(boundary - (start & (boundary - 1)), len); 450 } 451 452 int ism_move(struct ism_dev *ism, u64 dmb_tok, unsigned int idx, bool sf, 453 unsigned int offset, void *data, unsigned int size) 454 { 455 unsigned int bytes; 456 u64 dmb_req; 457 int ret; 458 459 while (size) { 460 bytes = max_bytes(offset, size, PAGE_SIZE); 461 dmb_req = ISM_CREATE_REQ(dmb_tok, idx, size == bytes ? sf : 0, 462 offset); 463 464 ret = __ism_move(ism, dmb_req, data, bytes); 465 if (ret) 466 return ret; 467 468 size -= bytes; 469 data += bytes; 470 offset += bytes; 471 } 472 473 return 0; 474 } 475 EXPORT_SYMBOL_GPL(ism_move); 476 477 static struct ism_systemeid SYSTEM_EID = { 478 .seid_string = "IBM-SYSZ-ISMSEID00000000", 479 .serial_number = "0000", 480 .type = "0000", 481 }; 482 483 static void ism_create_system_eid(void) 484 { 485 struct cpuid id; 486 u16 ident_tail; 487 char tmp[5]; 488 489 get_cpu_id(&id); 490 ident_tail = (u16)(id.ident & ISM_IDENT_MASK); 491 snprintf(tmp, 5, "%04X", ident_tail); 492 memcpy(&SYSTEM_EID.serial_number, tmp, 4); 493 snprintf(tmp, 5, "%04X", id.machine); 494 memcpy(&SYSTEM_EID.type, tmp, 4); 495 } 496 497 u8 *ism_get_seid(void) 498 { 499 return SYSTEM_EID.seid_string; 500 } 501 EXPORT_SYMBOL_GPL(ism_get_seid); 502 503 static u16 ism_get_chid(struct ism_dev *ism) 504 { 505 if (!ism || !ism->pdev) 506 return 0; 507 508 return to_zpci(ism->pdev)->pchid; 509 } 510 511 static void ism_handle_event(struct ism_dev *ism) 512 { 513 struct ism_event *entry; 514 struct ism_client *clt; 515 int i; 516 517 while ((ism->ieq_idx + 1) != READ_ONCE(ism->ieq->header.idx)) { 518 if (++(ism->ieq_idx) == ARRAY_SIZE(ism->ieq->entry)) 519 ism->ieq_idx = 0; 520 521 entry = &ism->ieq->entry[ism->ieq_idx]; 522 debug_event(ism_debug_info, 2, entry, sizeof(*entry)); 523 for (i = 0; i < max_client; ++i) { 524 clt = ism->subs[i]; 525 if (clt) 526 clt->handle_event(ism, entry); 527 } 528 } 529 } 530 531 static irqreturn_t ism_handle_irq(int irq, void *data) 532 { 533 struct ism_dev *ism = data; 534 unsigned long bit, end; 535 unsigned long *bv; 536 u16 dmbemask; 537 u8 client_id; 538 539 bv = (void *) &ism->sba->dmb_bits[ISM_DMB_WORD_OFFSET]; 540 end = sizeof(ism->sba->dmb_bits) * BITS_PER_BYTE - ISM_DMB_BIT_OFFSET; 541 542 spin_lock(&ism->lock); 543 ism->sba->s = 0; 544 barrier(); 545 for (bit = 0;;) { 546 bit = find_next_bit_inv(bv, end, bit); 547 if (bit >= end) 548 break; 549 550 clear_bit_inv(bit, bv); 551 dmbemask = ism->sba->dmbe_mask[bit + ISM_DMB_BIT_OFFSET]; 552 ism->sba->dmbe_mask[bit + ISM_DMB_BIT_OFFSET] = 0; 553 barrier(); 554 client_id = ism->sba_client_arr[bit]; 555 if (unlikely(client_id == NO_CLIENT || !ism->subs[client_id])) 556 continue; 557 ism->subs[client_id]->handle_irq(ism, bit + ISM_DMB_BIT_OFFSET, dmbemask); 558 } 559 560 if (ism->sba->e) { 561 ism->sba->e = 0; 562 barrier(); 563 ism_handle_event(ism); 564 } 565 spin_unlock(&ism->lock); 566 return IRQ_HANDLED; 567 } 568 569 static u64 ism_get_local_gid(struct ism_dev *ism) 570 { 571 return ism->local_gid; 572 } 573 574 static void ism_dev_add_work_func(struct work_struct *work) 575 { 576 struct ism_client *client = container_of(work, struct ism_client, 577 add_work); 578 579 client->add(client->tgt_ism); 580 ism_setup_forwarding(client, client->tgt_ism); 581 atomic_dec(&client->tgt_ism->add_dev_cnt); 582 wake_up(&client->tgt_ism->waitq); 583 } 584 585 static int ism_dev_init(struct ism_dev *ism) 586 { 587 struct pci_dev *pdev = ism->pdev; 588 unsigned long flags; 589 int i, ret; 590 591 ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI); 592 if (ret <= 0) 593 goto out; 594 595 ism->sba_client_arr = kzalloc(ISM_NR_DMBS, GFP_KERNEL); 596 if (!ism->sba_client_arr) 597 goto free_vectors; 598 memset(ism->sba_client_arr, NO_CLIENT, ISM_NR_DMBS); 599 600 ret = request_irq(pci_irq_vector(pdev, 0), ism_handle_irq, 0, 601 pci_name(pdev), ism); 602 if (ret) 603 goto free_client_arr; 604 605 ret = register_sba(ism); 606 if (ret) 607 goto free_irq; 608 609 ret = register_ieq(ism); 610 if (ret) 611 goto unreg_sba; 612 613 ret = ism_read_local_gid(ism); 614 if (ret) 615 goto unreg_ieq; 616 617 if (!ism_add_vlan_id(ism, ISM_RESERVED_VLANID)) 618 /* hardware is V2 capable */ 619 ism_create_system_eid(); 620 621 init_waitqueue_head(&ism->waitq); 622 atomic_set(&ism->free_clients_cnt, 0); 623 atomic_set(&ism->add_dev_cnt, 0); 624 625 wait_event(ism->waitq, !atomic_read(&ism->add_dev_cnt)); 626 spin_lock_irqsave(&clients_lock, flags); 627 for (i = 0; i < max_client; ++i) 628 if (clients[i]) { 629 INIT_WORK(&clients[i]->add_work, 630 ism_dev_add_work_func); 631 clients[i]->tgt_ism = ism; 632 atomic_inc(&ism->add_dev_cnt); 633 schedule_work(&clients[i]->add_work); 634 } 635 spin_unlock_irqrestore(&clients_lock, flags); 636 637 wait_event(ism->waitq, !atomic_read(&ism->add_dev_cnt)); 638 639 mutex_lock(&ism_dev_list.mutex); 640 list_add(&ism->list, &ism_dev_list.list); 641 mutex_unlock(&ism_dev_list.mutex); 642 643 query_info(ism); 644 return 0; 645 646 unreg_ieq: 647 unregister_ieq(ism); 648 unreg_sba: 649 unregister_sba(ism); 650 free_irq: 651 free_irq(pci_irq_vector(pdev, 0), ism); 652 free_client_arr: 653 kfree(ism->sba_client_arr); 654 free_vectors: 655 pci_free_irq_vectors(pdev); 656 out: 657 return ret; 658 } 659 660 static int ism_probe(struct pci_dev *pdev, const struct pci_device_id *id) 661 { 662 struct ism_dev *ism; 663 int ret; 664 665 ism = kzalloc(sizeof(*ism), GFP_KERNEL); 666 if (!ism) 667 return -ENOMEM; 668 669 spin_lock_init(&ism->lock); 670 dev_set_drvdata(&pdev->dev, ism); 671 ism->pdev = pdev; 672 ism->dev.parent = &pdev->dev; 673 device_initialize(&ism->dev); 674 dev_set_name(&ism->dev, dev_name(&pdev->dev)); 675 ret = device_add(&ism->dev); 676 if (ret) 677 goto err_dev; 678 679 ret = pci_enable_device_mem(pdev); 680 if (ret) 681 goto err; 682 683 ret = pci_request_mem_regions(pdev, DRV_NAME); 684 if (ret) 685 goto err_disable; 686 687 ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)); 688 if (ret) 689 goto err_resource; 690 691 dma_set_seg_boundary(&pdev->dev, SZ_1M - 1); 692 dma_set_max_seg_size(&pdev->dev, SZ_1M); 693 pci_set_master(pdev); 694 695 ret = ism_dev_init(ism); 696 if (ret) 697 goto err_resource; 698 699 return 0; 700 701 err_resource: 702 pci_release_mem_regions(pdev); 703 err_disable: 704 pci_disable_device(pdev); 705 err: 706 device_del(&ism->dev); 707 err_dev: 708 dev_set_drvdata(&pdev->dev, NULL); 709 kfree(ism); 710 711 return ret; 712 } 713 714 static void ism_dev_remove_work_func(struct work_struct *work) 715 { 716 struct ism_client *client = container_of(work, struct ism_client, 717 remove_work); 718 unsigned long flags; 719 720 spin_lock_irqsave(&client->tgt_ism->lock, flags); 721 client->tgt_ism->subs[client->id] = NULL; 722 spin_unlock_irqrestore(&client->tgt_ism->lock, flags); 723 client->remove(client->tgt_ism); 724 atomic_dec(&client->tgt_ism->free_clients_cnt); 725 wake_up(&client->tgt_ism->waitq); 726 } 727 728 /* Callers must hold ism_dev_list.mutex */ 729 static void ism_dev_exit(struct ism_dev *ism) 730 { 731 struct pci_dev *pdev = ism->pdev; 732 unsigned long flags; 733 int i; 734 735 wait_event(ism->waitq, !atomic_read(&ism->free_clients_cnt)); 736 spin_lock_irqsave(&clients_lock, flags); 737 for (i = 0; i < max_client; ++i) 738 if (clients[i]) { 739 INIT_WORK(&clients[i]->remove_work, 740 ism_dev_remove_work_func); 741 clients[i]->tgt_ism = ism; 742 atomic_inc(&ism->free_clients_cnt); 743 schedule_work(&clients[i]->remove_work); 744 } 745 spin_unlock_irqrestore(&clients_lock, flags); 746 747 wait_event(ism->waitq, !atomic_read(&ism->free_clients_cnt)); 748 749 if (SYSTEM_EID.serial_number[0] != '0' || 750 SYSTEM_EID.type[0] != '0') 751 ism_del_vlan_id(ism, ISM_RESERVED_VLANID); 752 unregister_ieq(ism); 753 unregister_sba(ism); 754 free_irq(pci_irq_vector(pdev, 0), ism); 755 kfree(ism->sba_client_arr); 756 pci_free_irq_vectors(pdev); 757 list_del_init(&ism->list); 758 } 759 760 static void ism_remove(struct pci_dev *pdev) 761 { 762 struct ism_dev *ism = dev_get_drvdata(&pdev->dev); 763 764 mutex_lock(&ism_dev_list.mutex); 765 ism_dev_exit(ism); 766 mutex_unlock(&ism_dev_list.mutex); 767 768 pci_release_mem_regions(pdev); 769 pci_disable_device(pdev); 770 device_del(&ism->dev); 771 dev_set_drvdata(&pdev->dev, NULL); 772 kfree(ism); 773 } 774 775 static struct pci_driver ism_driver = { 776 .name = DRV_NAME, 777 .id_table = ism_device_table, 778 .probe = ism_probe, 779 .remove = ism_remove, 780 }; 781 782 static int __init ism_init(void) 783 { 784 int ret; 785 786 ism_debug_info = debug_register("ism", 2, 1, 16); 787 if (!ism_debug_info) 788 return -ENODEV; 789 790 memset(clients, 0, sizeof(clients)); 791 max_client = 0; 792 debug_register_view(ism_debug_info, &debug_hex_ascii_view); 793 ret = pci_register_driver(&ism_driver); 794 if (ret) 795 debug_unregister(ism_debug_info); 796 797 return ret; 798 } 799 800 static void __exit ism_exit(void) 801 { 802 pci_unregister_driver(&ism_driver); 803 debug_unregister(ism_debug_info); 804 } 805 806 module_init(ism_init); 807 module_exit(ism_exit); 808 809 /*************************** SMC-D Implementation *****************************/ 810 811 #if IS_ENABLED(CONFIG_SMC) 812 static int smcd_query_rgid(struct smcd_dev *smcd, u64 rgid, u32 vid_valid, 813 u32 vid) 814 { 815 return ism_query_rgid(smcd->priv, rgid, vid_valid, vid); 816 } 817 818 static int smcd_register_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb, 819 struct ism_client *client) 820 { 821 return ism_register_dmb(smcd->priv, (struct ism_dmb *)dmb, client); 822 } 823 824 static int smcd_unregister_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb) 825 { 826 return ism_unregister_dmb(smcd->priv, (struct ism_dmb *)dmb); 827 } 828 829 static int smcd_add_vlan_id(struct smcd_dev *smcd, u64 vlan_id) 830 { 831 return ism_add_vlan_id(smcd->priv, vlan_id); 832 } 833 834 static int smcd_del_vlan_id(struct smcd_dev *smcd, u64 vlan_id) 835 { 836 return ism_del_vlan_id(smcd->priv, vlan_id); 837 } 838 839 static int smcd_set_vlan_required(struct smcd_dev *smcd) 840 { 841 return ism_cmd_simple(smcd->priv, ISM_SET_VLAN); 842 } 843 844 static int smcd_reset_vlan_required(struct smcd_dev *smcd) 845 { 846 return ism_cmd_simple(smcd->priv, ISM_RESET_VLAN); 847 } 848 849 static int smcd_signal_ieq(struct smcd_dev *smcd, u64 rgid, u32 trigger_irq, 850 u32 event_code, u64 info) 851 { 852 return ism_signal_ieq(smcd->priv, rgid, trigger_irq, event_code, info); 853 } 854 855 static int smcd_move(struct smcd_dev *smcd, u64 dmb_tok, unsigned int idx, 856 bool sf, unsigned int offset, void *data, 857 unsigned int size) 858 { 859 return ism_move(smcd->priv, dmb_tok, idx, sf, offset, data, size); 860 } 861 862 static int smcd_supports_v2(void) 863 { 864 return SYSTEM_EID.serial_number[0] != '0' || 865 SYSTEM_EID.type[0] != '0'; 866 } 867 868 static u64 smcd_get_local_gid(struct smcd_dev *smcd) 869 { 870 return ism_get_local_gid(smcd->priv); 871 } 872 873 static u16 smcd_get_chid(struct smcd_dev *smcd) 874 { 875 return ism_get_chid(smcd->priv); 876 } 877 878 static inline struct device *smcd_get_dev(struct smcd_dev *dev) 879 { 880 struct ism_dev *ism = dev->priv; 881 882 return &ism->dev; 883 } 884 885 static const struct smcd_ops ism_ops = { 886 .query_remote_gid = smcd_query_rgid, 887 .register_dmb = smcd_register_dmb, 888 .unregister_dmb = smcd_unregister_dmb, 889 .add_vlan_id = smcd_add_vlan_id, 890 .del_vlan_id = smcd_del_vlan_id, 891 .set_vlan_required = smcd_set_vlan_required, 892 .reset_vlan_required = smcd_reset_vlan_required, 893 .signal_event = smcd_signal_ieq, 894 .move_data = smcd_move, 895 .supports_v2 = smcd_supports_v2, 896 .get_system_eid = ism_get_seid, 897 .get_local_gid = smcd_get_local_gid, 898 .get_chid = smcd_get_chid, 899 .get_dev = smcd_get_dev, 900 }; 901 902 const struct smcd_ops *ism_get_smcd_ops(void) 903 { 904 return &ism_ops; 905 } 906 EXPORT_SYMBOL_GPL(ism_get_smcd_ops); 907 #endif 908