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