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 static bool ism_v2_capable;
  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 void ism_free_dmb(struct ism_dev *ism, struct ism_dmb *dmb)
 293 {
 294         clear_bit(dmb->sba_idx, ism->sba_bitmap);
 295         dma_free_coherent(&ism->pdev->dev, dmb->dmb_len,
 296                           dmb->cpu_addr, dmb->dma_addr);
 297 }
 298
 299 static int ism_alloc_dmb(struct ism_dev *ism, struct ism_dmb *dmb)
 300 {
 301         unsigned long bit;
 302
 303         if (PAGE_ALIGN(dmb->dmb_len) > dma_get_max_seg_size(&ism->pdev->dev))
 304                 return -EINVAL;
 305
 306         if (!dmb->sba_idx) {
 307                 bit = find_next_zero_bit(ism->sba_bitmap, ISM_NR_DMBS,
 308                                          ISM_DMB_BIT_OFFSET);
 309                 if (bit == ISM_NR_DMBS)
 310                         return -ENOSPC;
 311
 312                 dmb->sba_idx = bit;
 313         }
 314         if (dmb->sba_idx < ISM_DMB_BIT_OFFSET ||
 315             test_and_set_bit(dmb->sba_idx, ism->sba_bitmap))
 316                 return -EINVAL;
 317
 318         dmb->cpu_addr = dma_alloc_coherent(&ism->pdev->dev, dmb->dmb_len,
 319                                            &dmb->dma_addr,
 320                                            GFP_KERNEL | __GFP_NOWARN |
 321                                            __GFP_NOMEMALLOC | __GFP_NORETRY);
 322         if (!dmb->cpu_addr)
 323                 clear_bit(dmb->sba_idx, ism->sba_bitmap);
 324
 325         return dmb->cpu_addr ? 0 : -ENOMEM;
 326 }
 327
 328 int ism_register_dmb(struct ism_dev *ism, struct ism_dmb *dmb,
 329                      struct ism_client *client)
 330 {
 331         union ism_reg_dmb cmd;
 332         unsigned long flags;
 333         int ret;
 334
 335         ret = ism_alloc_dmb(ism, dmb);
 336         if (ret)
 337                 goto out;
 338
 339         memset(&cmd, 0, sizeof(cmd));
 340         cmd.request.hdr.cmd = ISM_REG_DMB;
 341         cmd.request.hdr.len = sizeof(cmd.request);
 342
 343         cmd.request.dmb = dmb->dma_addr;
 344         cmd.request.dmb_len = dmb->dmb_len;
 345         cmd.request.sba_idx = dmb->sba_idx;
 346         cmd.request.vlan_valid = dmb->vlan_valid;
 347         cmd.request.vlan_id = dmb->vlan_id;
 348         cmd.request.rgid = dmb->rgid;
 349
 350         ret = ism_cmd(ism, &cmd);
 351         if (ret) {
 352                 ism_free_dmb(ism, dmb);
 353                 goto out;
 354         }
 355         dmb->dmb_tok = cmd.response.dmb_tok;
 356         spin_lock_irqsave(&ism->lock, flags);
 357         ism->sba_client_arr[dmb->sba_idx - ISM_DMB_BIT_OFFSET] = client->id;
 358         spin_unlock_irqrestore(&ism->lock, flags);
 359 out:
 360         return ret;
 361 }
 362 EXPORT_SYMBOL_GPL(ism_register_dmb);
 363
 364 int ism_unregister_dmb(struct ism_dev *ism, struct ism_dmb *dmb)
 365 {
 366         union ism_unreg_dmb cmd;
 367         unsigned long flags;
 368         int ret;
 369
 370         memset(&cmd, 0, sizeof(cmd));
 371         cmd.request.hdr.cmd = ISM_UNREG_DMB;
 372         cmd.request.hdr.len = sizeof(cmd.request);
 373
 374         cmd.request.dmb_tok = dmb->dmb_tok;
 375
 376         spin_lock_irqsave(&ism->lock, flags);
 377         ism->sba_client_arr[dmb->sba_idx - ISM_DMB_BIT_OFFSET] = NO_CLIENT;
 378         spin_unlock_irqrestore(&ism->lock, flags);
 379
 380         ret = ism_cmd(ism, &cmd);
 381         if (ret && ret != ISM_ERROR)
 382                 goto out;
 383
 384         ism_free_dmb(ism, dmb);
 385 out:
 386         return ret;
 387 }
 388 EXPORT_SYMBOL_GPL(ism_unregister_dmb);
 389
 390 static int ism_add_vlan_id(struct ism_dev *ism, u64 vlan_id)
 391 {
 392         union ism_set_vlan_id cmd;
 393
 394         memset(&cmd, 0, sizeof(cmd));
 395         cmd.request.hdr.cmd = ISM_ADD_VLAN_ID;
 396         cmd.request.hdr.len = sizeof(cmd.request);
 397
 398         cmd.request.vlan_id = vlan_id;
 399
 400         return ism_cmd(ism, &cmd);
 401 }
 402
 403 static int ism_del_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_DEL_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 unsigned int max_bytes(unsigned int start, unsigned int len,
 417                               unsigned int boundary)
 418 {
 419         return min(boundary - (start & (boundary - 1)), len);
 420 }
 421
 422 int ism_move(struct ism_dev *ism, u64 dmb_tok, unsigned int idx, bool sf,
 423              unsigned int offset, void *data, unsigned int size)
 424 {
 425         unsigned int bytes;
 426         u64 dmb_req;
 427         int ret;
 428
 429         while (size) {
 430                 bytes = max_bytes(offset, size, PAGE_SIZE);
 431                 dmb_req = ISM_CREATE_REQ(dmb_tok, idx, size == bytes ? sf : 0,
 432                                          offset);
 433
 434                 ret = __ism_move(ism, dmb_req, data, bytes);
 435                 if (ret)
 436                         return ret;
 437
 438                 size -= bytes;
 439                 data += bytes;
 440                 offset += bytes;
 441         }
 442
 443         return 0;
 444 }
 445 EXPORT_SYMBOL_GPL(ism_move);
 446
 447 static void ism_handle_event(struct ism_dev *ism)
 448 {
 449         struct ism_event *entry;
 450         struct ism_client *clt;
 451         int i;
 452
 453         while ((ism->ieq_idx + 1) != READ_ONCE(ism->ieq->header.idx)) {
 454                 if (++(ism->ieq_idx) == ARRAY_SIZE(ism->ieq->entry))
 455                         ism->ieq_idx = 0;
 456
 457                 entry = &ism->ieq->entry[ism->ieq_idx];
 458                 debug_event(ism_debug_info, 2, entry, sizeof(*entry));
 459                 for (i = 0; i < max_client; ++i) {
 460                         clt = ism->subs[i];
 461                         if (clt)
 462                                 clt->handle_event(ism, entry);
 463                 }
 464         }
 465 }
 466
 467 static irqreturn_t ism_handle_irq(int irq, void *data)
 468 {
 469         struct ism_dev *ism = data;
 470         unsigned long bit, end;
 471         unsigned long *bv;
 472         u16 dmbemask;
 473         u8 client_id;
 474
 475         bv = (void *) &ism->sba->dmb_bits[ISM_DMB_WORD_OFFSET];
 476         end = sizeof(ism->sba->dmb_bits) * BITS_PER_BYTE - ISM_DMB_BIT_OFFSET;
 477
 478         spin_lock(&ism->lock);
 479         ism->sba->s = 0;
 480         barrier();
 481         for (bit = 0;;) {
 482                 bit = find_next_bit_inv(bv, end, bit);
 483                 if (bit >= end)
 484                         break;
 485
 486                 clear_bit_inv(bit, bv);
 487                 dmbemask = ism->sba->dmbe_mask[bit + ISM_DMB_BIT_OFFSET];
 488                 ism->sba->dmbe_mask[bit + ISM_DMB_BIT_OFFSET] = 0;
 489                 barrier();
 490                 client_id = ism->sba_client_arr[bit];
 491                 if (unlikely(client_id == NO_CLIENT || !ism->subs[client_id]))
 492                         continue;
 493                 ism->subs[client_id]->handle_irq(ism, bit + ISM_DMB_BIT_OFFSET, dmbemask);
 494         }
 495
 496         if (ism->sba->e) {
 497                 ism->sba->e = 0;
 498                 barrier();
 499                 ism_handle_event(ism);
 500         }
 501         spin_unlock(&ism->lock);
 502         return IRQ_HANDLED;
 503 }
 504
 505 static int ism_dev_init(struct ism_dev *ism)
 506 {
 507         struct pci_dev *pdev = ism->pdev;
 508         int i, ret;
 509
 510         ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI);
 511         if (ret <= 0)
 512                 goto out;
 513
 514         ism->sba_client_arr = kzalloc(ISM_NR_DMBS, GFP_KERNEL);
 515         if (!ism->sba_client_arr)
 516                 goto free_vectors;
 517         memset(ism->sba_client_arr, NO_CLIENT, ISM_NR_DMBS);
 518
 519         ret = request_irq(pci_irq_vector(pdev, 0), ism_handle_irq, 0,
 520                           pci_name(pdev), ism);
 521         if (ret)
 522                 goto free_client_arr;
 523
 524         ret = register_sba(ism);
 525         if (ret)
 526                 goto free_irq;
 527
 528         ret = register_ieq(ism);
 529         if (ret)
 530                 goto unreg_sba;
 531
 532         ret = ism_read_local_gid(ism);
 533         if (ret)
 534                 goto unreg_ieq;
 535
 536         if (!ism_add_vlan_id(ism, ISM_RESERVED_VLANID))
 537                 /* hardware is V2 capable */
 538                 ism_v2_capable = true;
 539         else
 540                 ism_v2_capable = false;
 541
 542         mutex_lock(&ism_dev_list.mutex);
 543         mutex_lock(&clients_lock);
 544         for (i = 0; i < max_client; ++i) {
 545                 if (clients[i]) {
 546                         clients[i]->add(ism);
 547                         ism_setup_forwarding(clients[i], ism);
 548                 }
 549         }
 550         mutex_unlock(&clients_lock);
 551
 552         list_add(&ism->list, &ism_dev_list.list);
 553         mutex_unlock(&ism_dev_list.mutex);
 554
 555         query_info(ism);
 556         return 0;
 557
 558 unreg_ieq:
 559         unregister_ieq(ism);
 560 unreg_sba:
 561         unregister_sba(ism);
 562 free_irq:
 563         free_irq(pci_irq_vector(pdev, 0), ism);
 564 free_client_arr:
 565         kfree(ism->sba_client_arr);
 566 free_vectors:
 567         pci_free_irq_vectors(pdev);
 568 out:
 569         return ret;
 570 }
 571
 572 static int ism_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 573 {
 574         struct ism_dev *ism;
 575         int ret;
 576
 577         ism = kzalloc(sizeof(*ism), GFP_KERNEL);
 578         if (!ism)
 579                 return -ENOMEM;
 580
 581         spin_lock_init(&ism->lock);
 582         dev_set_drvdata(&pdev->dev, ism);
 583         ism->pdev = pdev;
 584         ism->dev.parent = &pdev->dev;
 585         device_initialize(&ism->dev);
 586         dev_set_name(&ism->dev, dev_name(&pdev->dev));
 587         ret = device_add(&ism->dev);
 588         if (ret)
 589                 goto err_dev;
 590
 591         ret = pci_enable_device_mem(pdev);
 592         if (ret)
 593                 goto err;
 594
 595         ret = pci_request_mem_regions(pdev, DRV_NAME);
 596         if (ret)
 597                 goto err_disable;
 598
 599         ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
 600         if (ret)
 601                 goto err_resource;
 602
 603         dma_set_seg_boundary(&pdev->dev, SZ_1M - 1);
 604         dma_set_max_seg_size(&pdev->dev, SZ_1M);
 605         pci_set_master(pdev);
 606
 607         ret = ism_dev_init(ism);
 608         if (ret)
 609                 goto err_resource;
 610
 611         return 0;
 612
 613 err_resource:
 614         pci_release_mem_regions(pdev);
 615 err_disable:
 616         pci_disable_device(pdev);
 617 err:
 618         device_del(&ism->dev);
 619 err_dev:
 620         dev_set_drvdata(&pdev->dev, NULL);
 621         kfree(ism);
 622
 623         return ret;
 624 }
 625
 626 static void ism_dev_exit(struct ism_dev *ism)
 627 {
 628         struct pci_dev *pdev = ism->pdev;
 629         unsigned long flags;
 630         int i;
 631
 632         spin_lock_irqsave(&ism->lock, flags);
 633         for (i = 0; i < max_client; ++i)
 634                 ism->subs[i] = NULL;
 635         spin_unlock_irqrestore(&ism->lock, flags);
 636
 637         mutex_lock(&ism_dev_list.mutex);
 638         mutex_lock(&clients_lock);
 639         for (i = 0; i < max_client; ++i) {
 640                 if (clients[i])
 641                         clients[i]->remove(ism);
 642         }
 643         mutex_unlock(&clients_lock);
 644
 645         if (ism_v2_capable)
 646                 ism_del_vlan_id(ism, ISM_RESERVED_VLANID);
 647         unregister_ieq(ism);
 648         unregister_sba(ism);
 649         free_irq(pci_irq_vector(pdev, 0), ism);
 650         kfree(ism->sba_client_arr);
 651         pci_free_irq_vectors(pdev);
 652         list_del_init(&ism->list);
 653         mutex_unlock(&ism_dev_list.mutex);
 654 }
 655
 656 static void ism_remove(struct pci_dev *pdev)
 657 {
 658         struct ism_dev *ism = dev_get_drvdata(&pdev->dev);
 659
 660         ism_dev_exit(ism);
 661
 662         pci_release_mem_regions(pdev);
 663         pci_disable_device(pdev);
 664         device_del(&ism->dev);
 665         dev_set_drvdata(&pdev->dev, NULL);
 666         kfree(ism);
 667 }
 668
 669 static struct pci_driver ism_driver = {
 670         .name     = DRV_NAME,
 671         .id_table = ism_device_table,
 672         .probe    = ism_probe,
 673         .remove   = ism_remove,
 674 };
 675
 676 static int __init ism_init(void)
 677 {
 678         int ret;
 679
 680         ism_debug_info = debug_register("ism", 2, 1, 16);
 681         if (!ism_debug_info)
 682                 return -ENODEV;
 683
 684         memset(clients, 0, sizeof(clients));
 685         max_client = 0;
 686         debug_register_view(ism_debug_info, &debug_hex_ascii_view);
 687         ret = pci_register_driver(&ism_driver);
 688         if (ret)
 689                 debug_unregister(ism_debug_info);
 690
 691         return ret;
 692 }
 693
 694 static void __exit ism_exit(void)
 695 {
 696         pci_unregister_driver(&ism_driver);
 697         debug_unregister(ism_debug_info);
 698 }
 699
 700 module_init(ism_init);
 701 module_exit(ism_exit);
 702
 703 /*************************** SMC-D Implementation *****************************/
 704
 705 #if IS_ENABLED(CONFIG_SMC)
 706 static int ism_query_rgid(struct ism_dev *ism, u64 rgid, u32 vid_valid,
 707                           u32 vid)
 708 {
 709         union ism_query_rgid cmd;
 710
 711         memset(&cmd, 0, sizeof(cmd));
 712         cmd.request.hdr.cmd = ISM_QUERY_RGID;
 713         cmd.request.hdr.len = sizeof(cmd.request);
 714
 715         cmd.request.rgid = rgid;
 716         cmd.request.vlan_valid = vid_valid;
 717         cmd.request.vlan_id = vid;
 718
 719         return ism_cmd(ism, &cmd);
 720 }
 721
 722 static int smcd_query_rgid(struct smcd_dev *smcd, struct smcd_gid *rgid,
 723                            u32 vid_valid, u32 vid)
 724 {
 725         return ism_query_rgid(smcd->priv, rgid->gid, vid_valid, vid);
 726 }
 727
 728 static int smcd_register_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb,
 729                              struct ism_client *client)
 730 {
 731         return ism_register_dmb(smcd->priv, (struct ism_dmb *)dmb, client);
 732 }
 733
 734 static int smcd_unregister_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb)
 735 {
 736         return ism_unregister_dmb(smcd->priv, (struct ism_dmb *)dmb);
 737 }
 738
 739 static int smcd_add_vlan_id(struct smcd_dev *smcd, u64 vlan_id)
 740 {
 741         return ism_add_vlan_id(smcd->priv, vlan_id);
 742 }
 743
 744 static int smcd_del_vlan_id(struct smcd_dev *smcd, u64 vlan_id)
 745 {
 746         return ism_del_vlan_id(smcd->priv, vlan_id);
 747 }
 748
 749 static int smcd_set_vlan_required(struct smcd_dev *smcd)
 750 {
 751         return ism_cmd_simple(smcd->priv, ISM_SET_VLAN);
 752 }
 753
 754 static int smcd_reset_vlan_required(struct smcd_dev *smcd)
 755 {
 756         return ism_cmd_simple(smcd->priv, ISM_RESET_VLAN);
 757 }
 758
 759 static int ism_signal_ieq(struct ism_dev *ism, u64 rgid, u32 trigger_irq,
 760                           u32 event_code, u64 info)
 761 {
 762         union ism_sig_ieq cmd;
 763
 764         memset(&cmd, 0, sizeof(cmd));
 765         cmd.request.hdr.cmd = ISM_SIGNAL_IEQ;
 766         cmd.request.hdr.len = sizeof(cmd.request);
 767
 768         cmd.request.rgid = rgid;
 769         cmd.request.trigger_irq = trigger_irq;
 770         cmd.request.event_code = event_code;
 771         cmd.request.info = info;
 772
 773         return ism_cmd(ism, &cmd);
 774 }
 775
 776 static int smcd_signal_ieq(struct smcd_dev *smcd, struct smcd_gid *rgid,
 777                            u32 trigger_irq, u32 event_code, u64 info)
 778 {
 779         return ism_signal_ieq(smcd->priv, rgid->gid,
 780                               trigger_irq, event_code, info);
 781 }
 782
 783 static int smcd_move(struct smcd_dev *smcd, u64 dmb_tok, unsigned int idx,
 784                      bool sf, unsigned int offset, void *data,
 785                      unsigned int size)
 786 {
 787         return ism_move(smcd->priv, dmb_tok, idx, sf, offset, data, size);
 788 }
 789
 790 static int smcd_supports_v2(void)
 791 {
 792         return ism_v2_capable;
 793 }
 794
 795 static u64 ism_get_local_gid(struct ism_dev *ism)
 796 {
 797         return ism->local_gid;
 798 }
 799
 800 static void smcd_get_local_gid(struct smcd_dev *smcd,
 801                                struct smcd_gid *smcd_gid)
 802 {
 803         smcd_gid->gid = ism_get_local_gid(smcd->priv);
 804         smcd_gid->gid_ext = 0;
 805 }
 806
 807 static u16 ism_get_chid(struct ism_dev *ism)
 808 {
 809         if (!ism || !ism->pdev)
 810                 return 0;
 811
 812         return to_zpci(ism->pdev)->pchid;
 813 }
 814
 815 static u16 smcd_get_chid(struct smcd_dev *smcd)
 816 {
 817         return ism_get_chid(smcd->priv);
 818 }
 819
 820 static inline struct device *smcd_get_dev(struct smcd_dev *dev)
 821 {
 822         struct ism_dev *ism = dev->priv;
 823
 824         return &ism->dev;
 825 }
 826
 827 static const struct smcd_ops ism_ops = {
 828         .query_remote_gid = smcd_query_rgid,
 829         .register_dmb = smcd_register_dmb,
 830         .unregister_dmb = smcd_unregister_dmb,
 831         .add_vlan_id = smcd_add_vlan_id,
 832         .del_vlan_id = smcd_del_vlan_id,
 833         .set_vlan_required = smcd_set_vlan_required,
 834         .reset_vlan_required = smcd_reset_vlan_required,
 835         .signal_event = smcd_signal_ieq,
 836         .move_data = smcd_move,
 837         .supports_v2 = smcd_supports_v2,
 838         .get_local_gid = smcd_get_local_gid,
 839         .get_chid = smcd_get_chid,
 840         .get_dev = smcd_get_dev,
 841 };
 842
 843 const struct smcd_ops *ism_get_smcd_ops(void)
 844 {
 845         return &ism_ops;
 846 }
 847 EXPORT_SYMBOL_GPL(ism_get_smcd_ops);
 848 #endif