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