drivers/s390/virtio/virtio_ccw.c

   1 /*
   2  * ccw based virtio transport
   3  *
   4  * Copyright IBM Corp. 2012, 2014
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License (version 2 only)
   8  * as published by the Free Software Foundation.
   9  *
  10  *    Author(s): Cornelia Huck <[email protected]>
  11  */
  12
  13 #include <linux/kernel_stat.h>
  14 #include <linux/init.h>
  15 #include <linux/bootmem.h>
  16 #include <linux/err.h>
  17 #include <linux/virtio.h>
  18 #include <linux/virtio_config.h>
  19 #include <linux/slab.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/virtio_ring.h>
  22 #include <linux/pfn.h>
  23 #include <linux/async.h>
  24 #include <linux/wait.h>
  25 #include <linux/list.h>
  26 #include <linux/bitops.h>
  27 #include <linux/module.h>
  28 #include <linux/io.h>
  29 #include <linux/kvm_para.h>
  30 #include <linux/notifier.h>
  31 #include <asm/diag.h>
  32 #include <asm/setup.h>
  33 #include <asm/irq.h>
  34 #include <asm/cio.h>
  35 #include <asm/ccwdev.h>
  36 #include <asm/virtio-ccw.h>
  37 #include <asm/isc.h>
  38 #include <asm/airq.h>
  39
  40 /*
  41  * virtio related functions
  42  */
  43
  44 struct vq_config_block {
  45         __u16 index;
  46         __u16 num;
  47 } __packed;
  48
  49 #define VIRTIO_CCW_CONFIG_SIZE 0x100
  50 /* same as PCI config space size, should be enough for all drivers */
  51
  52 struct virtio_ccw_device {
  53         struct virtio_device vdev;
  54         __u8 *status;
  55         __u8 config[VIRTIO_CCW_CONFIG_SIZE];
  56         struct ccw_device *cdev;
  57         __u32 curr_io;
  58         int err;
  59         unsigned int revision; /* Transport revision */
  60         wait_queue_head_t wait_q;
  61         spinlock_t lock;
  62         struct list_head virtqueues;
  63         unsigned long indicators;
  64         unsigned long indicators2;
  65         struct vq_config_block *config_block;
  66         bool is_thinint;
  67         bool going_away;
  68         bool device_lost;
  69         unsigned int config_ready;
  70         void *airq_info;
  71 };
  72
  73 struct vq_info_block_legacy {
  74         __u64 queue;
  75         __u32 align;
  76         __u16 index;
  77         __u16 num;
  78 } __packed;
  79
  80 struct vq_info_block {
  81         __u64 desc;
  82         __u32 res0;
  83         __u16 index;
  84         __u16 num;
  85         __u64 avail;
  86         __u64 used;
  87 } __packed;
  88
  89 struct virtio_feature_desc {
  90         __u32 features;
  91         __u8 index;
  92 } __packed;
  93
  94 struct virtio_thinint_area {
  95         unsigned long summary_indicator;
  96         unsigned long indicator;
  97         u64 bit_nr;
  98         u8 isc;
  99 } __packed;
 100
 101 struct virtio_rev_info {
 102         __u16 revision;
 103         __u16 length;
 104         __u8 data[];
 105 };
 106
 107 /* the highest virtio-ccw revision we support */
 108 #define VIRTIO_CCW_REV_MAX 1
 109
 110 struct virtio_ccw_vq_info {
 111         struct virtqueue *vq;
 112         int num;
 113         void *queue;
 114         union {
 115                 struct vq_info_block s;
 116                 struct vq_info_block_legacy l;
 117         } *info_block;
 118         int bit_nr;
 119         struct list_head node;
 120         long cookie;
 121 };
 122
 123 #define VIRTIO_AIRQ_ISC IO_SCH_ISC /* inherit from subchannel */
 124
 125 #define VIRTIO_IV_BITS (L1_CACHE_BYTES * 8)
 126 #define MAX_AIRQ_AREAS 20
 127
 128 static int virtio_ccw_use_airq = 1;
 129
 130 struct airq_info {
 131         rwlock_t lock;
 132         u8 summary_indicator;
 133         struct airq_struct airq;
 134         struct airq_iv *aiv;
 135 };
 136 static struct airq_info *airq_areas[MAX_AIRQ_AREAS];
 137
 138 #define CCW_CMD_SET_VQ 0x13
 139 #define CCW_CMD_VDEV_RESET 0x33
 140 #define CCW_CMD_SET_IND 0x43
 141 #define CCW_CMD_SET_CONF_IND 0x53
 142 #define CCW_CMD_READ_FEAT 0x12
 143 #define CCW_CMD_WRITE_FEAT 0x11
 144 #define CCW_CMD_READ_CONF 0x22
 145 #define CCW_CMD_WRITE_CONF 0x21
 146 #define CCW_CMD_WRITE_STATUS 0x31
 147 #define CCW_CMD_READ_VQ_CONF 0x32
 148 #define CCW_CMD_SET_IND_ADAPTER 0x73
 149 #define CCW_CMD_SET_VIRTIO_REV 0x83
 150
 151 #define VIRTIO_CCW_DOING_SET_VQ 0x00010000
 152 #define VIRTIO_CCW_DOING_RESET 0x00040000
 153 #define VIRTIO_CCW_DOING_READ_FEAT 0x00080000
 154 #define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000
 155 #define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000
 156 #define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000
 157 #define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000
 158 #define VIRTIO_CCW_DOING_SET_IND 0x01000000
 159 #define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000
 160 #define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000
 161 #define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000
 162 #define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000
 163 #define VIRTIO_CCW_INTPARM_MASK 0xffff0000
 164
 165 static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev)
 166 {
 167         return container_of(vdev, struct virtio_ccw_device, vdev);
 168 }
 169
 170 static void drop_airq_indicator(struct virtqueue *vq, struct airq_info *info)
 171 {
 172         unsigned long i, flags;
 173
 174         write_lock_irqsave(&info->lock, flags);
 175         for (i = 0; i < airq_iv_end(info->aiv); i++) {
 176                 if (vq == (void *)airq_iv_get_ptr(info->aiv, i)) {
 177                         airq_iv_free_bit(info->aiv, i);
 178                         airq_iv_set_ptr(info->aiv, i, 0);
 179                         break;
 180                 }
 181         }
 182         write_unlock_irqrestore(&info->lock, flags);
 183 }
 184
 185 static void virtio_airq_handler(struct airq_struct *airq)
 186 {
 187         struct airq_info *info = container_of(airq, struct airq_info, airq);
 188         unsigned long ai;
 189
 190         inc_irq_stat(IRQIO_VAI);
 191         read_lock(&info->lock);
 192         /* Walk through indicators field, summary indicator active. */
 193         for (ai = 0;;) {
 194                 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv));
 195                 if (ai == -1UL)
 196                         break;
 197                 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai));
 198         }
 199         info->summary_indicator = 0;
 200         smp_wmb();
 201         /* Walk through indicators field, summary indicator not active. */
 202         for (ai = 0;;) {
 203                 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv));
 204                 if (ai == -1UL)
 205                         break;
 206                 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai));
 207         }
 208         read_unlock(&info->lock);
 209 }
 210
 211 static struct airq_info *new_airq_info(void)
 212 {
 213         struct airq_info *info;
 214         int rc;
 215
 216         info = kzalloc(sizeof(*info), GFP_KERNEL);
 217         if (!info)
 218                 return NULL;
 219         rwlock_init(&info->lock);
 220         info->aiv = airq_iv_create(VIRTIO_IV_BITS, AIRQ_IV_ALLOC | AIRQ_IV_PTR);
 221         if (!info->aiv) {
 222                 kfree(info);
 223                 return NULL;
 224         }
 225         info->airq.handler = virtio_airq_handler;
 226         info->airq.lsi_ptr = &info->summary_indicator;
 227         info->airq.lsi_mask = 0xff;
 228         info->airq.isc = VIRTIO_AIRQ_ISC;
 229         rc = register_adapter_interrupt(&info->airq);
 230         if (rc) {
 231                 airq_iv_release(info->aiv);
 232                 kfree(info);
 233                 return NULL;
 234         }
 235         return info;
 236 }
 237
 238 static void destroy_airq_info(struct airq_info *info)
 239 {
 240         if (!info)
 241                 return;
 242
 243         unregister_adapter_interrupt(&info->airq);
 244         airq_iv_release(info->aiv);
 245         kfree(info);
 246 }
 247
 248 static unsigned long get_airq_indicator(struct virtqueue *vqs[], int nvqs,
 249                                         u64 *first, void **airq_info)
 250 {
 251         int i, j;
 252         struct airq_info *info;
 253         unsigned long indicator_addr = 0;
 254         unsigned long bit, flags;
 255
 256         for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) {
 257                 if (!airq_areas[i])
 258                         airq_areas[i] = new_airq_info();
 259                 info = airq_areas[i];
 260                 if (!info)
 261                         return 0;
 262                 write_lock_irqsave(&info->lock, flags);
 263                 bit = airq_iv_alloc(info->aiv, nvqs);
 264                 if (bit == -1UL) {
 265                         /* Not enough vacancies. */
 266                         write_unlock_irqrestore(&info->lock, flags);
 267                         continue;
 268                 }
 269                 *first = bit;
 270                 *airq_info = info;
 271                 indicator_addr = (unsigned long)info->aiv->vector;
 272                 for (j = 0; j < nvqs; j++) {
 273                         airq_iv_set_ptr(info->aiv, bit + j,
 274                                         (unsigned long)vqs[j]);
 275                 }
 276                 write_unlock_irqrestore(&info->lock, flags);
 277         }
 278         return indicator_addr;
 279 }
 280
 281 static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev)
 282 {
 283         struct virtio_ccw_vq_info *info;
 284
 285         list_for_each_entry(info, &vcdev->virtqueues, node)
 286                 drop_airq_indicator(info->vq, vcdev->airq_info);
 287 }
 288
 289 static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag)
 290 {
 291         unsigned long flags;
 292         __u32 ret;
 293
 294         spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
 295         if (vcdev->err)
 296                 ret = 0;
 297         else
 298                 ret = vcdev->curr_io & flag;
 299         spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
 300         return ret;
 301 }
 302
 303 static int ccw_io_helper(struct virtio_ccw_device *vcdev,
 304                          struct ccw1 *ccw, __u32 intparm)
 305 {
 306         int ret;
 307         unsigned long flags;
 308         int flag = intparm & VIRTIO_CCW_INTPARM_MASK;
 309
 310         do {
 311                 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
 312                 ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0);
 313                 if (!ret) {
 314                         if (!vcdev->curr_io)
 315                                 vcdev->err = 0;
 316                         vcdev->curr_io |= flag;
 317                 }
 318                 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
 319                 cpu_relax();
 320         } while (ret == -EBUSY);
 321         wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0);
 322         return ret ? ret : vcdev->err;
 323 }
 324
 325 static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev,
 326                                       struct ccw1 *ccw)
 327 {
 328         int ret;
 329         unsigned long *indicatorp = NULL;
 330         struct virtio_thinint_area *thinint_area = NULL;
 331         struct airq_info *airq_info = vcdev->airq_info;
 332
 333         if (vcdev->is_thinint) {
 334                 thinint_area = kzalloc(sizeof(*thinint_area),
 335                                        GFP_DMA | GFP_KERNEL);
 336                 if (!thinint_area)
 337                         return;
 338                 thinint_area->summary_indicator =
 339                         (unsigned long) &airq_info->summary_indicator;
 340                 thinint_area->isc = VIRTIO_AIRQ_ISC;
 341                 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
 342                 ccw->count = sizeof(*thinint_area);
 343                 ccw->cda = (__u32)(unsigned long) thinint_area;
 344         } else {
 345                 indicatorp = kmalloc(sizeof(&vcdev->indicators),
 346                                      GFP_DMA | GFP_KERNEL);
 347                 if (!indicatorp)
 348                         return;
 349                 *indicatorp = 0;
 350                 ccw->cmd_code = CCW_CMD_SET_IND;
 351                 ccw->count = sizeof(vcdev->indicators);
 352                 ccw->cda = (__u32)(unsigned long) indicatorp;
 353         }
 354         /* Deregister indicators from host. */
 355         vcdev->indicators = 0;
 356         ccw->flags = 0;
 357         ret = ccw_io_helper(vcdev, ccw,
 358                             vcdev->is_thinint ?
 359                             VIRTIO_CCW_DOING_SET_IND_ADAPTER :
 360                             VIRTIO_CCW_DOING_SET_IND);
 361         if (ret && (ret != -ENODEV))
 362                 dev_info(&vcdev->cdev->dev,
 363                          "Failed to deregister indicators (%d)\n", ret);
 364         else if (vcdev->is_thinint)
 365                 virtio_ccw_drop_indicators(vcdev);
 366         kfree(indicatorp);
 367         kfree(thinint_area);
 368 }
 369
 370 static inline long __do_kvm_notify(struct subchannel_id schid,
 371                                    unsigned long queue_index,
 372                                    long cookie)
 373 {
 374         register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY;
 375         register struct subchannel_id __schid asm("2") = schid;
 376         register unsigned long __index asm("3") = queue_index;
 377         register long __rc asm("2");
 378         register long __cookie asm("4") = cookie;
 379
 380         asm volatile ("diag 2,4,0x500\n"
 381                       : "=d" (__rc) : "d" (__nr), "d" (__schid), "d" (__index),
 382                       "d"(__cookie)
 383                       : "memory", "cc");
 384         return __rc;
 385 }
 386
 387 static inline long do_kvm_notify(struct subchannel_id schid,
 388                                  unsigned long queue_index,
 389                                  long cookie)
 390 {
 391         diag_stat_inc(DIAG_STAT_X500);
 392         return __do_kvm_notify(schid, queue_index, cookie);
 393 }
 394
 395 static bool virtio_ccw_kvm_notify(struct virtqueue *vq)
 396 {
 397         struct virtio_ccw_vq_info *info = vq->priv;
 398         struct virtio_ccw_device *vcdev;
 399         struct subchannel_id schid;
 400
 401         vcdev = to_vc_device(info->vq->vdev);
 402         ccw_device_get_schid(vcdev->cdev, &schid);
 403         info->cookie = do_kvm_notify(schid, vq->index, info->cookie);
 404         if (info->cookie < 0)
 405                 return false;
 406         return true;
 407 }
 408
 409 static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev,
 410                                    struct ccw1 *ccw, int index)
 411 {
 412         int ret;
 413
 414         vcdev->config_block->index = index;
 415         ccw->cmd_code = CCW_CMD_READ_VQ_CONF;
 416         ccw->flags = 0;
 417         ccw->count = sizeof(struct vq_config_block);
 418         ccw->cda = (__u32)(unsigned long)(vcdev->config_block);
 419         ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF);
 420         if (ret)
 421                 return ret;
 422         return vcdev->config_block->num;
 423 }
 424
 425 static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw)
 426 {
 427         struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev);
 428         struct virtio_ccw_vq_info *info = vq->priv;
 429         unsigned long flags;
 430         unsigned long size;
 431         int ret;
 432         unsigned int index = vq->index;
 433
 434         /* Remove from our list. */
 435         spin_lock_irqsave(&vcdev->lock, flags);
 436         list_del(&info->node);
 437         spin_unlock_irqrestore(&vcdev->lock, flags);
 438
 439         /* Release from host. */
 440         if (vcdev->revision == 0) {
 441                 info->info_block->l.queue = 0;
 442                 info->info_block->l.align = 0;
 443                 info->info_block->l.index = index;
 444                 info->info_block->l.num = 0;
 445                 ccw->count = sizeof(info->info_block->l);
 446         } else {
 447                 info->info_block->s.desc = 0;
 448                 info->info_block->s.index = index;
 449                 info->info_block->s.num = 0;
 450                 info->info_block->s.avail = 0;
 451                 info->info_block->s.used = 0;
 452                 ccw->count = sizeof(info->info_block->s);
 453         }
 454         ccw->cmd_code = CCW_CMD_SET_VQ;
 455         ccw->flags = 0;
 456         ccw->cda = (__u32)(unsigned long)(info->info_block);
 457         ret = ccw_io_helper(vcdev, ccw,
 458                             VIRTIO_CCW_DOING_SET_VQ | index);
 459         /*
 460          * -ENODEV isn't considered an error: The device is gone anyway.
 461          * This may happen on device detach.
 462          */
 463         if (ret && (ret != -ENODEV))
 464                 dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d",
 465                          ret, index);
 466
 467         vring_del_virtqueue(vq);
 468         size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
 469         free_pages_exact(info->queue, size);
 470         kfree(info->info_block);
 471         kfree(info);
 472 }
 473
 474 static void virtio_ccw_del_vqs(struct virtio_device *vdev)
 475 {
 476         struct virtqueue *vq, *n;
 477         struct ccw1 *ccw;
 478         struct virtio_ccw_device *vcdev = to_vc_device(vdev);
 479
 480         ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
 481         if (!ccw)
 482                 return;
 483
 484         virtio_ccw_drop_indicator(vcdev, ccw);
 485
 486         list_for_each_entry_safe(vq, n, &vdev->vqs, list)
 487                 virtio_ccw_del_vq(vq, ccw);
 488
 489         kfree(ccw);
 490 }
 491
 492 static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
 493                                              int i, vq_callback_t *callback,
 494                                              const char *name,
 495                                              struct ccw1 *ccw)
 496 {
 497         struct virtio_ccw_device *vcdev = to_vc_device(vdev);
 498         int err;
 499         struct virtqueue *vq = NULL;
 500         struct virtio_ccw_vq_info *info;
 501         unsigned long size = 0; /* silence the compiler */
 502         unsigned long flags;
 503
 504         /* Allocate queue. */
 505         info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL);
 506         if (!info) {
 507                 dev_warn(&vcdev->cdev->dev, "no info\n");
 508                 err = -ENOMEM;
 509                 goto out_err;
 510         }
 511         info->info_block = kzalloc(sizeof(*info->info_block),
 512                                    GFP_DMA | GFP_KERNEL);
 513         if (!info->info_block) {
 514                 dev_warn(&vcdev->cdev->dev, "no info block\n");
 515                 err = -ENOMEM;
 516                 goto out_err;
 517         }
 518         info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i);
 519         if (info->num < 0) {
 520                 err = info->num;
 521                 goto out_err;
 522         }
 523         size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
 524         info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO);
 525         if (info->queue == NULL) {
 526                 dev_warn(&vcdev->cdev->dev, "no queue\n");
 527                 err = -ENOMEM;
 528                 goto out_err;
 529         }
 530
 531         vq = vring_new_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, vdev,
 532                                  true, info->queue, virtio_ccw_kvm_notify,
 533                                  callback, name);
 534         if (!vq) {
 535                 /* For now, we fail if we can't get the requested size. */
 536                 dev_warn(&vcdev->cdev->dev, "no vq\n");
 537                 err = -ENOMEM;
 538                 goto out_err;
 539         }
 540
 541         /* Register it with the host. */
 542         if (vcdev->revision == 0) {
 543                 info->info_block->l.queue = (__u64)info->queue;
 544                 info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN;
 545                 info->info_block->l.index = i;
 546                 info->info_block->l.num = info->num;
 547                 ccw->count = sizeof(info->info_block->l);
 548         } else {
 549                 info->info_block->s.desc = (__u64)info->queue;
 550                 info->info_block->s.index = i;
 551                 info->info_block->s.num = info->num;
 552                 info->info_block->s.avail = (__u64)virtqueue_get_avail(vq);
 553                 info->info_block->s.used = (__u64)virtqueue_get_used(vq);
 554                 ccw->count = sizeof(info->info_block->s);
 555         }
 556         ccw->cmd_code = CCW_CMD_SET_VQ;
 557         ccw->flags = 0;
 558         ccw->cda = (__u32)(unsigned long)(info->info_block);
 559         err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i);
 560         if (err) {
 561                 dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n");
 562                 goto out_err;
 563         }
 564
 565         info->vq = vq;
 566         vq->priv = info;
 567
 568         /* Save it to our list. */
 569         spin_lock_irqsave(&vcdev->lock, flags);
 570         list_add(&info->node, &vcdev->virtqueues);
 571         spin_unlock_irqrestore(&vcdev->lock, flags);
 572
 573         return vq;
 574
 575 out_err:
 576         if (vq)
 577                 vring_del_virtqueue(vq);
 578         if (info) {
 579                 if (info->queue)
 580                         free_pages_exact(info->queue, size);
 581                 kfree(info->info_block);
 582         }
 583         kfree(info);
 584         return ERR_PTR(err);
 585 }
 586
 587 static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev,
 588                                            struct virtqueue *vqs[], int nvqs,
 589                                            struct ccw1 *ccw)
 590 {
 591         int ret;
 592         struct virtio_thinint_area *thinint_area = NULL;
 593         struct airq_info *info;
 594
 595         thinint_area = kzalloc(sizeof(*thinint_area), GFP_DMA | GFP_KERNEL);
 596         if (!thinint_area) {
 597                 ret = -ENOMEM;
 598                 goto out;
 599         }
 600         /* Try to get an indicator. */
 601         thinint_area->indicator = get_airq_indicator(vqs, nvqs,
 602                                                      &thinint_area->bit_nr,
 603                                                      &vcdev->airq_info);
 604         if (!thinint_area->indicator) {
 605                 ret = -ENOSPC;
 606                 goto out;
 607         }
 608         info = vcdev->airq_info;
 609         thinint_area->summary_indicator =
 610                 (unsigned long) &info->summary_indicator;
 611         thinint_area->isc = VIRTIO_AIRQ_ISC;
 612         ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
 613         ccw->flags = CCW_FLAG_SLI;
 614         ccw->count = sizeof(*thinint_area);
 615         ccw->cda = (__u32)(unsigned long)thinint_area;
 616         ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER);
 617         if (ret) {
 618                 if (ret == -EOPNOTSUPP) {
 619                         /*
 620                          * The host does not support adapter interrupts
 621                          * for virtio-ccw, stop trying.
 622                          */
 623                         virtio_ccw_use_airq = 0;
 624                         pr_info("Adapter interrupts unsupported on host\n");
 625                 } else
 626                         dev_warn(&vcdev->cdev->dev,
 627                                  "enabling adapter interrupts = %d\n", ret);
 628                 virtio_ccw_drop_indicators(vcdev);
 629         }
 630 out:
 631         kfree(thinint_area);
 632         return ret;
 633 }
 634
 635 static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
 636                                struct virtqueue *vqs[],
 637                                vq_callback_t *callbacks[],
 638                                const char * const names[])
 639 {
 640         struct virtio_ccw_device *vcdev = to_vc_device(vdev);
 641         unsigned long *indicatorp = NULL;
 642         int ret, i;
 643         struct ccw1 *ccw;
 644
 645         ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
 646         if (!ccw)
 647                 return -ENOMEM;
 648
 649         for (i = 0; i < nvqs; ++i) {
 650                 vqs[i] = virtio_ccw_setup_vq(vdev, i, callbacks[i], names[i],
 651                                              ccw);
 652                 if (IS_ERR(vqs[i])) {
 653                         ret = PTR_ERR(vqs[i]);
 654                         vqs[i] = NULL;
 655                         goto out;
 656                 }
 657         }
 658         ret = -ENOMEM;
 659         /* We need a data area under 2G to communicate. */
 660         indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL);
 661         if (!indicatorp)
 662                 goto out;
 663         *indicatorp = (unsigned long) &vcdev->indicators;
 664         if (vcdev->is_thinint) {
 665                 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw);
 666                 if (ret)
 667                         /* no error, just fall back to legacy interrupts */
 668                         vcdev->is_thinint = 0;
 669         }
 670         if (!vcdev->is_thinint) {
 671                 /* Register queue indicators with host. */
 672                 vcdev->indicators = 0;
 673                 ccw->cmd_code = CCW_CMD_SET_IND;
 674                 ccw->flags = 0;
 675                 ccw->count = sizeof(vcdev->indicators);
 676                 ccw->cda = (__u32)(unsigned long) indicatorp;
 677                 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND);
 678                 if (ret)
 679                         goto out;
 680         }
 681         /* Register indicators2 with host for config changes */
 682         *indicatorp = (unsigned long) &vcdev->indicators2;
 683         vcdev->indicators2 = 0;
 684         ccw->cmd_code = CCW_CMD_SET_CONF_IND;
 685         ccw->flags = 0;
 686         ccw->count = sizeof(vcdev->indicators2);
 687         ccw->cda = (__u32)(unsigned long) indicatorp;
 688         ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND);
 689         if (ret)
 690                 goto out;
 691
 692         kfree(indicatorp);
 693         kfree(ccw);
 694         return 0;
 695 out:
 696         kfree(indicatorp);
 697         kfree(ccw);
 698         virtio_ccw_del_vqs(vdev);
 699         return ret;
 700 }
 701
 702 static void virtio_ccw_reset(struct virtio_device *vdev)
 703 {
 704         struct virtio_ccw_device *vcdev = to_vc_device(vdev);
 705         struct ccw1 *ccw;
 706
 707         ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
 708         if (!ccw)
 709                 return;
 710
 711         /* Zero status bits. */
 712         *vcdev->status = 0;
 713
 714         /* Send a reset ccw on device. */
 715         ccw->cmd_code = CCW_CMD_VDEV_RESET;
 716         ccw->flags = 0;
 717         ccw->count = 0;
 718         ccw->cda = 0;
 719         ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET);
 720         kfree(ccw);
 721 }
 722
 723 static u64 virtio_ccw_get_features(struct virtio_device *vdev)
 724 {
 725         struct virtio_ccw_device *vcdev = to_vc_device(vdev);
 726         struct virtio_feature_desc *features;
 727         int ret;
 728         u64 rc;
 729         struct ccw1 *ccw;
 730
 731         ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
 732         if (!ccw)
 733                 return 0;
 734
 735         features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
 736         if (!features) {
 737                 rc = 0;
 738                 goto out_free;
 739         }
 740         /* Read the feature bits from the host. */
 741         features->index = 0;
 742         ccw->cmd_code = CCW_CMD_READ_FEAT;
 743         ccw->flags = 0;
 744         ccw->count = sizeof(*features);
 745         ccw->cda = (__u32)(unsigned long)features;
 746         ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
 747         if (ret) {
 748                 rc = 0;
 749                 goto out_free;
 750         }
 751
 752         rc = le32_to_cpu(features->features);
 753
 754         if (vcdev->revision == 0)
 755                 goto out_free;
 756
 757         /* Read second half of the feature bits from the host. */
 758         features->index = 1;
 759         ccw->cmd_code = CCW_CMD_READ_FEAT;
 760         ccw->flags = 0;
 761         ccw->count = sizeof(*features);
 762         ccw->cda = (__u32)(unsigned long)features;
 763         ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
 764         if (ret == 0)
 765                 rc |= (u64)le32_to_cpu(features->features) << 32;
 766
 767 out_free:
 768         kfree(features);
 769         kfree(ccw);
 770         return rc;
 771 }
 772
 773 static int virtio_ccw_finalize_features(struct virtio_device *vdev)
 774 {
 775         struct virtio_ccw_device *vcdev = to_vc_device(vdev);
 776         struct virtio_feature_desc *features;
 777         struct ccw1 *ccw;
 778         int ret;
 779
 780         if (vcdev->revision >= 1 &&
 781             !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) {
 782                 dev_err(&vdev->dev, "virtio: device uses revision 1 "
 783                         "but does not have VIRTIO_F_VERSION_1\n");
 784                 return -EINVAL;
 785         }
 786
 787         ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
 788         if (!ccw)
 789                 return -ENOMEM;
 790
 791         features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
 792         if (!features) {
 793                 ret = -ENOMEM;
 794                 goto out_free;
 795         }
 796         /* Give virtio_ring a chance to accept features. */
 797         vring_transport_features(vdev);
 798
 799         features->index = 0;
 800         features->features = cpu_to_le32((u32)vdev->features);
 801         /* Write the first half of the feature bits to the host. */
 802         ccw->cmd_code = CCW_CMD_WRITE_FEAT;
 803         ccw->flags = 0;
 804         ccw->count = sizeof(*features);
 805         ccw->cda = (__u32)(unsigned long)features;
 806         ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
 807         if (ret)
 808                 goto out_free;
 809
 810         if (vcdev->revision == 0)
 811                 goto out_free;
 812
 813         features->index = 1;
 814         features->features = cpu_to_le32(vdev->features >> 32);
 815         /* Write the second half of the feature bits to the host. */
 816         ccw->cmd_code = CCW_CMD_WRITE_FEAT;
 817         ccw->flags = 0;
 818         ccw->count = sizeof(*features);
 819         ccw->cda = (__u32)(unsigned long)features;
 820         ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
 821
 822 out_free:
 823         kfree(features);
 824         kfree(ccw);
 825
 826         return ret;
 827 }
 828
 829 static void virtio_ccw_get_config(struct virtio_device *vdev,
 830                                   unsigned int offset, void *buf, unsigned len)
 831 {
 832         struct virtio_ccw_device *vcdev = to_vc_device(vdev);
 833         int ret;
 834         struct ccw1 *ccw;
 835         void *config_area;
 836
 837         ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
 838         if (!ccw)
 839                 return;
 840
 841         config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL);
 842         if (!config_area)
 843                 goto out_free;
 844
 845         /* Read the config area from the host. */
 846         ccw->cmd_code = CCW_CMD_READ_CONF;
 847         ccw->flags = 0;
 848         ccw->count = offset + len;
 849         ccw->cda = (__u32)(unsigned long)config_area;
 850         ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG);
 851         if (ret)
 852                 goto out_free;
 853
 854         memcpy(vcdev->config, config_area, offset + len);
 855         if (buf)
 856                 memcpy(buf, &vcdev->config[offset], len);
 857         if (vcdev->config_ready < offset + len)
 858                 vcdev->config_ready = offset + len;
 859
 860 out_free:
 861         kfree(config_area);
 862         kfree(ccw);
 863 }
 864
 865 static void virtio_ccw_set_config(struct virtio_device *vdev,
 866                                   unsigned int offset, const void *buf,
 867                                   unsigned len)
 868 {
 869         struct virtio_ccw_device *vcdev = to_vc_device(vdev);
 870         struct ccw1 *ccw;
 871         void *config_area;
 872
 873         ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
 874         if (!ccw)
 875                 return;
 876
 877         config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL);
 878         if (!config_area)
 879                 goto out_free;
 880
 881         /* Make sure we don't overwrite fields. */
 882         if (vcdev->config_ready < offset)
 883                 virtio_ccw_get_config(vdev, 0, NULL, offset);
 884         memcpy(&vcdev->config[offset], buf, len);
 885         /* Write the config area to the host. */
 886         memcpy(config_area, vcdev->config, sizeof(vcdev->config));
 887         ccw->cmd_code = CCW_CMD_WRITE_CONF;
 888         ccw->flags = 0;
 889         ccw->count = offset + len;
 890         ccw->cda = (__u32)(unsigned long)config_area;
 891         ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG);
 892
 893 out_free:
 894         kfree(config_area);
 895         kfree(ccw);
 896 }
 897
 898 static u8 virtio_ccw_get_status(struct virtio_device *vdev)
 899 {
 900         struct virtio_ccw_device *vcdev = to_vc_device(vdev);
 901
 902         return *vcdev->status;
 903 }
 904
 905 static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status)
 906 {
 907         struct virtio_ccw_device *vcdev = to_vc_device(vdev);
 908         u8 old_status = *vcdev->status;
 909         struct ccw1 *ccw;
 910         int ret;
 911
 912         ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
 913         if (!ccw)
 914                 return;
 915
 916         /* Write the status to the host. */
 917         *vcdev->status = status;
 918         ccw->cmd_code = CCW_CMD_WRITE_STATUS;
 919         ccw->flags = 0;
 920         ccw->count = sizeof(status);
 921         ccw->cda = (__u32)(unsigned long)vcdev->status;
 922         ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS);
 923         /* Write failed? We assume status is unchanged. */
 924         if (ret)
 925                 *vcdev->status = old_status;
 926         kfree(ccw);
 927 }
 928
 929 static struct virtio_config_ops virtio_ccw_config_ops = {
 930         .get_features = virtio_ccw_get_features,
 931         .finalize_features = virtio_ccw_finalize_features,
 932         .get = virtio_ccw_get_config,
 933         .set = virtio_ccw_set_config,
 934         .get_status = virtio_ccw_get_status,
 935         .set_status = virtio_ccw_set_status,
 936         .reset = virtio_ccw_reset,
 937         .find_vqs = virtio_ccw_find_vqs,
 938         .del_vqs = virtio_ccw_del_vqs,
 939 };
 940
 941
 942 /*
 943  * ccw bus driver related functions
 944  */
 945
 946 static void virtio_ccw_release_dev(struct device *_d)
 947 {
 948         struct virtio_device *dev = container_of(_d, struct virtio_device,
 949                                                  dev);
 950         struct virtio_ccw_device *vcdev = to_vc_device(dev);
 951
 952         kfree(vcdev->status);
 953         kfree(vcdev->config_block);
 954         kfree(vcdev);
 955 }
 956
 957 static int irb_is_error(struct irb *irb)
 958 {
 959         if (scsw_cstat(&irb->scsw) != 0)
 960                 return 1;
 961         if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))
 962                 return 1;
 963         if (scsw_cc(&irb->scsw) != 0)
 964                 return 1;
 965         return 0;
 966 }
 967
 968 static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev,
 969                                               int index)
 970 {
 971         struct virtio_ccw_vq_info *info;
 972         unsigned long flags;
 973         struct virtqueue *vq;
 974
 975         vq = NULL;
 976         spin_lock_irqsave(&vcdev->lock, flags);
 977         list_for_each_entry(info, &vcdev->virtqueues, node) {
 978                 if (info->vq->index == index) {
 979                         vq = info->vq;
 980                         break;
 981                 }
 982         }
 983         spin_unlock_irqrestore(&vcdev->lock, flags);
 984         return vq;
 985 }
 986
 987 static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev,
 988                                       __u32 activity)
 989 {
 990         if (vcdev->curr_io & activity) {
 991                 switch (activity) {
 992                 case VIRTIO_CCW_DOING_READ_FEAT:
 993                 case VIRTIO_CCW_DOING_WRITE_FEAT:
 994                 case VIRTIO_CCW_DOING_READ_CONFIG:
 995                 case VIRTIO_CCW_DOING_WRITE_CONFIG:
 996                 case VIRTIO_CCW_DOING_WRITE_STATUS:
 997                 case VIRTIO_CCW_DOING_SET_VQ:
 998                 case VIRTIO_CCW_DOING_SET_IND:
 999                 case VIRTIO_CCW_DOING_SET_CONF_IND:
1000                 case VIRTIO_CCW_DOING_RESET:
1001                 case VIRTIO_CCW_DOING_READ_VQ_CONF:
1002                 case VIRTIO_CCW_DOING_SET_IND_ADAPTER:
1003                 case VIRTIO_CCW_DOING_SET_VIRTIO_REV:
1004                         vcdev->curr_io &= ~activity;
1005                         wake_up(&vcdev->wait_q);
1006                         break;
1007                 default:
1008                         /* don't know what to do... */
1009                         dev_warn(&vcdev->cdev->dev,
1010                                  "Suspicious activity '%08x'\n", activity);
1011                         WARN_ON(1);
1012                         break;
1013                 }
1014         }
1015 }
1016
1017 static void virtio_ccw_int_handler(struct ccw_device *cdev,
1018                                    unsigned long intparm,
1019                                    struct irb *irb)
1020 {
1021         __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK;
1022         struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1023         int i;
1024         struct virtqueue *vq;
1025
1026         if (!vcdev)
1027                 return;
1028         if (IS_ERR(irb)) {
1029                 vcdev->err = PTR_ERR(irb);
1030                 virtio_ccw_check_activity(vcdev, activity);
1031                 /* Don't poke around indicators, something's wrong. */
1032                 return;
1033         }
1034         /* Check if it's a notification from the host. */
1035         if ((intparm == 0) &&
1036             (scsw_stctl(&irb->scsw) ==
1037              (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) {
1038                 /* OK */
1039         }
1040         if (irb_is_error(irb)) {
1041                 /* Command reject? */
1042                 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
1043                     (irb->ecw[0] & SNS0_CMD_REJECT))
1044                         vcdev->err = -EOPNOTSUPP;
1045                 else
1046                         /* Map everything else to -EIO. */
1047                         vcdev->err = -EIO;
1048         }
1049         virtio_ccw_check_activity(vcdev, activity);
1050         for_each_set_bit(i, &vcdev->indicators,
1051                          sizeof(vcdev->indicators) * BITS_PER_BYTE) {
1052                 /* The bit clear must happen before the vring kick. */
1053                 clear_bit(i, &vcdev->indicators);
1054                 barrier();
1055                 vq = virtio_ccw_vq_by_ind(vcdev, i);
1056                 vring_interrupt(0, vq);
1057         }
1058         if (test_bit(0, &vcdev->indicators2)) {
1059                 virtio_config_changed(&vcdev->vdev);
1060                 clear_bit(0, &vcdev->indicators2);
1061         }
1062 }
1063
1064 /*
1065  * We usually want to autoonline all devices, but give the admin
1066  * a way to exempt devices from this.
1067  */
1068 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
1069                      (8*sizeof(long)))
1070 static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS];
1071
1072 static char *no_auto = "";
1073
1074 module_param(no_auto, charp, 0444);
1075 MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined");
1076
1077 static int virtio_ccw_check_autoonline(struct ccw_device *cdev)
1078 {
1079         struct ccw_dev_id id;
1080
1081         ccw_device_get_id(cdev, &id);
1082         if (test_bit(id.devno, devs_no_auto[id.ssid]))
1083                 return 0;
1084         return 1;
1085 }
1086
1087 static void virtio_ccw_auto_online(void *data, async_cookie_t cookie)
1088 {
1089         struct ccw_device *cdev = data;
1090         int ret;
1091
1092         ret = ccw_device_set_online(cdev);
1093         if (ret)
1094                 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret);
1095 }
1096
1097 static int virtio_ccw_probe(struct ccw_device *cdev)
1098 {
1099         cdev->handler = virtio_ccw_int_handler;
1100
1101         if (virtio_ccw_check_autoonline(cdev))
1102                 async_schedule(virtio_ccw_auto_online, cdev);
1103         return 0;
1104 }
1105
1106 static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev)
1107 {
1108         unsigned long flags;
1109         struct virtio_ccw_device *vcdev;
1110
1111         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1112         vcdev = dev_get_drvdata(&cdev->dev);
1113         if (!vcdev || vcdev->going_away) {
1114                 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1115                 return NULL;
1116         }
1117         vcdev->going_away = true;
1118         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1119         return vcdev;
1120 }
1121
1122 static void virtio_ccw_remove(struct ccw_device *cdev)
1123 {
1124         unsigned long flags;
1125         struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
1126
1127         if (vcdev && cdev->online) {
1128                 if (vcdev->device_lost)
1129                         virtio_break_device(&vcdev->vdev);
1130                 unregister_virtio_device(&vcdev->vdev);
1131                 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1132                 dev_set_drvdata(&cdev->dev, NULL);
1133                 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1134         }
1135         cdev->handler = NULL;
1136 }
1137
1138 static int virtio_ccw_offline(struct ccw_device *cdev)
1139 {
1140         unsigned long flags;
1141         struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
1142
1143         if (!vcdev)
1144                 return 0;
1145         if (vcdev->device_lost)
1146                 virtio_break_device(&vcdev->vdev);
1147         unregister_virtio_device(&vcdev->vdev);
1148         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1149         dev_set_drvdata(&cdev->dev, NULL);
1150         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1151         return 0;
1152 }
1153
1154 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev)
1155 {
1156         struct virtio_rev_info *rev;
1157         struct ccw1 *ccw;
1158         int ret;
1159
1160         ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
1161         if (!ccw)
1162                 return -ENOMEM;
1163         rev = kzalloc(sizeof(*rev), GFP_DMA | GFP_KERNEL);
1164         if (!rev) {
1165                 kfree(ccw);
1166                 return -ENOMEM;
1167         }
1168
1169         /* Set transport revision */
1170         ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV;
1171         ccw->flags = 0;
1172         ccw->count = sizeof(*rev);
1173         ccw->cda = (__u32)(unsigned long)rev;
1174
1175         vcdev->revision = VIRTIO_CCW_REV_MAX;
1176         do {
1177                 rev->revision = vcdev->revision;
1178                 /* none of our supported revisions carry payload */
1179                 rev->length = 0;
1180                 ret = ccw_io_helper(vcdev, ccw,
1181                                     VIRTIO_CCW_DOING_SET_VIRTIO_REV);
1182                 if (ret == -EOPNOTSUPP) {
1183                         if (vcdev->revision == 0)
1184                                 /*
1185                                  * The host device does not support setting
1186                                  * the revision: let's operate it in legacy
1187                                  * mode.
1188                                  */
1189                                 ret = 0;
1190                         else
1191                                 vcdev->revision--;
1192                 }
1193         } while (ret == -EOPNOTSUPP);
1194
1195         kfree(ccw);
1196         kfree(rev);
1197         return ret;
1198 }
1199
1200 static int virtio_ccw_online(struct ccw_device *cdev)
1201 {
1202         int ret;
1203         struct virtio_ccw_device *vcdev;
1204         unsigned long flags;
1205
1206         vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL);
1207         if (!vcdev) {
1208                 dev_warn(&cdev->dev, "Could not get memory for virtio\n");
1209                 ret = -ENOMEM;
1210                 goto out_free;
1211         }
1212         vcdev->config_block = kzalloc(sizeof(*vcdev->config_block),
1213                                    GFP_DMA | GFP_KERNEL);
1214         if (!vcdev->config_block) {
1215                 ret = -ENOMEM;
1216                 goto out_free;
1217         }
1218         vcdev->status = kzalloc(sizeof(*vcdev->status), GFP_DMA | GFP_KERNEL);
1219         if (!vcdev->status) {
1220                 ret = -ENOMEM;
1221                 goto out_free;
1222         }
1223
1224         vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */
1225
1226         vcdev->vdev.dev.parent = &cdev->dev;
1227         vcdev->vdev.dev.release = virtio_ccw_release_dev;
1228         vcdev->vdev.config = &virtio_ccw_config_ops;
1229         vcdev->cdev = cdev;
1230         init_waitqueue_head(&vcdev->wait_q);
1231         INIT_LIST_HEAD(&vcdev->virtqueues);
1232         spin_lock_init(&vcdev->lock);
1233
1234         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1235         dev_set_drvdata(&cdev->dev, vcdev);
1236         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1237         vcdev->vdev.id.vendor = cdev->id.cu_type;
1238         vcdev->vdev.id.device = cdev->id.cu_model;
1239
1240         ret = virtio_ccw_set_transport_rev(vcdev);
1241         if (ret)
1242                 goto out_free;
1243
1244         ret = register_virtio_device(&vcdev->vdev);
1245         if (ret) {
1246                 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n",
1247                          ret);
1248                 goto out_put;
1249         }
1250         return 0;
1251 out_put:
1252         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1253         dev_set_drvdata(&cdev->dev, NULL);
1254         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1255         put_device(&vcdev->vdev.dev);
1256         return ret;
1257 out_free:
1258         if (vcdev) {
1259                 kfree(vcdev->status);
1260                 kfree(vcdev->config_block);
1261         }
1262         kfree(vcdev);
1263         return ret;
1264 }
1265
1266 static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event)
1267 {
1268         int rc;
1269         struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1270
1271         /*
1272          * Make sure vcdev is set
1273          * i.e. set_offline/remove callback not already running
1274          */
1275         if (!vcdev)
1276                 return NOTIFY_DONE;
1277
1278         switch (event) {
1279         case CIO_GONE:
1280                 vcdev->device_lost = true;
1281                 rc = NOTIFY_DONE;
1282                 break;
1283         default:
1284                 rc = NOTIFY_DONE;
1285                 break;
1286         }
1287         return rc;
1288 }
1289
1290 static struct ccw_device_id virtio_ids[] = {
1291         { CCW_DEVICE(0x3832, 0) },
1292         {},
1293 };
1294 MODULE_DEVICE_TABLE(ccw, virtio_ids);
1295
1296 static struct ccw_driver virtio_ccw_driver = {
1297         .driver = {
1298                 .owner = THIS_MODULE,
1299                 .name = "virtio_ccw",
1300         },
1301         .ids = virtio_ids,
1302         .probe = virtio_ccw_probe,
1303         .remove = virtio_ccw_remove,
1304         .set_offline = virtio_ccw_offline,
1305         .set_online = virtio_ccw_online,
1306         .notify = virtio_ccw_cio_notify,
1307         .int_class = IRQIO_VIR,
1308 };
1309
1310 static int __init pure_hex(char **cp, unsigned int *val, int min_digit,
1311                            int max_digit, int max_val)
1312 {
1313         int diff;
1314
1315         diff = 0;
1316         *val = 0;
1317
1318         while (diff <= max_digit) {
1319                 int value = hex_to_bin(**cp);
1320
1321                 if (value < 0)
1322                         break;
1323                 *val = *val * 16 + value;
1324                 (*cp)++;
1325                 diff++;
1326         }
1327
1328         if ((diff < min_digit) || (diff > max_digit) || (*val > max_val))
1329                 return 1;
1330
1331         return 0;
1332 }
1333
1334 static int __init parse_busid(char *str, unsigned int *cssid,
1335                               unsigned int *ssid, unsigned int *devno)
1336 {
1337         char *str_work;
1338         int rc, ret;
1339
1340         rc = 1;
1341
1342         if (*str == '\0')
1343                 goto out;
1344
1345         str_work = str;
1346         ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID);
1347         if (ret || (str_work[0] != '.'))
1348                 goto out;
1349         str_work++;
1350         ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID);
1351         if (ret || (str_work[0] != '.'))
1352                 goto out;
1353         str_work++;
1354         ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL);
1355         if (ret || (str_work[0] != '\0'))
1356                 goto out;
1357
1358         rc = 0;
1359 out:
1360         return rc;
1361 }
1362
1363 static void __init no_auto_parse(void)
1364 {
1365         unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to;
1366         char *parm, *str;
1367         int rc;
1368
1369         str = no_auto;
1370         while ((parm = strsep(&str, ","))) {
1371                 rc = parse_busid(strsep(&parm, "-"), &from_cssid,
1372                                  &from_ssid, &from);
1373                 if (rc)
1374                         continue;
1375                 if (parm != NULL) {
1376                         rc = parse_busid(parm, &to_cssid,
1377                                          &to_ssid, &to);
1378                         if ((from_ssid > to_ssid) ||
1379                             ((from_ssid == to_ssid) && (from > to)))
1380                                 rc = -EINVAL;
1381                 } else {
1382                         to_cssid = from_cssid;
1383                         to_ssid = from_ssid;
1384                         to = from;
1385                 }
1386                 if (rc)
1387                         continue;
1388                 while ((from_ssid < to_ssid) ||
1389                        ((from_ssid == to_ssid) && (from <= to))) {
1390                         set_bit(from, devs_no_auto[from_ssid]);
1391                         from++;
1392                         if (from > __MAX_SUBCHANNEL) {
1393                                 from_ssid++;
1394                                 from = 0;
1395                         }
1396                 }
1397         }
1398 }
1399
1400 static int __init virtio_ccw_init(void)
1401 {
1402         /* parse no_auto string before we do anything further */
1403         no_auto_parse();
1404         return ccw_driver_register(&virtio_ccw_driver);
1405 }
1406 module_init(virtio_ccw_init);
1407
1408 static void __exit virtio_ccw_exit(void)
1409 {
1410         int i;
1411
1412         ccw_driver_unregister(&virtio_ccw_driver);
1413         for (i = 0; i < MAX_AIRQ_AREAS; i++)
1414                 destroy_airq_info(airq_areas[i]);
1415 }
1416 module_exit(virtio_ccw_exit);