drivers/s390/net/ism_drv.c

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