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