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         vcdev->config_block->index = index;
 404         ccw->cmd_code = CCW_CMD_READ_VQ_CONF;
 405         ccw->flags = 0;
 406         ccw->count = sizeof(struct vq_config_block);
 407         ccw->cda = (__u32)(unsigned long)(vcdev->config_block);
 408         ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF);
 409         return vcdev->config_block->num;
 410 }
 411
 412 static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw)
 413 {
 414         struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev);
 415         struct virtio_ccw_vq_info *info = vq->priv;
 416         unsigned long flags;
 417         unsigned long size;
 418         int ret;
 419         unsigned int index = vq->index;
 420
 421         /* Remove from our list. */
 422         spin_lock_irqsave(&vcdev->lock, flags);
 423         list_del(&info->node);
 424         spin_unlock_irqrestore(&vcdev->lock, flags);
 425
 426         /* Release from host. */
 427         if (vcdev->revision == 0) {
 428                 info->info_block->l.queue = 0;
 429                 info->info_block->l.align = 0;
 430                 info->info_block->l.index = index;
 431                 info->info_block->l.num = 0;
 432                 ccw->count = sizeof(info->info_block->l);
 433         } else {
 434                 info->info_block->s.desc = 0;
 435                 info->info_block->s.index = index;
 436                 info->info_block->s.num = 0;
 437                 info->info_block->s.avail = 0;
 438                 info->info_block->s.used = 0;
 439                 ccw->count = sizeof(info->info_block->s);
 440         }
 441         ccw->cmd_code = CCW_CMD_SET_VQ;
 442         ccw->flags = 0;
 443         ccw->cda = (__u32)(unsigned long)(info->info_block);
 444         ret = ccw_io_helper(vcdev, ccw,
 445                             VIRTIO_CCW_DOING_SET_VQ | index);
 446         /*
 447          * -ENODEV isn't considered an error: The device is gone anyway.
 448          * This may happen on device detach.
 449          */
 450         if (ret && (ret != -ENODEV))
 451                 dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d",
 452                          ret, index);
 453
 454         vring_del_virtqueue(vq);
 455         size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
 456         free_pages_exact(info->queue, size);
 457         kfree(info->info_block);
 458         kfree(info);
 459 }
 460
 461 static void virtio_ccw_del_vqs(struct virtio_device *vdev)
 462 {
 463         struct virtqueue *vq, *n;
 464         struct ccw1 *ccw;
 465         struct virtio_ccw_device *vcdev = to_vc_device(vdev);
 466
 467         ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
 468         if (!ccw)
 469                 return;
 470
 471         virtio_ccw_drop_indicator(vcdev, ccw);
 472
 473         list_for_each_entry_safe(vq, n, &vdev->vqs, list)
 474                 virtio_ccw_del_vq(vq, ccw);
 475
 476         kfree(ccw);
 477 }
 478
 479 static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
 480                                              int i, vq_callback_t *callback,
 481                                              const char *name,
 482                                              struct ccw1 *ccw)
 483 {
 484         struct virtio_ccw_device *vcdev = to_vc_device(vdev);
 485         int err;
 486         struct virtqueue *vq = NULL;
 487         struct virtio_ccw_vq_info *info;
 488         unsigned long size = 0; /* silence the compiler */
 489         unsigned long flags;
 490
 491         /* Allocate queue. */
 492         info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL);
 493         if (!info) {
 494                 dev_warn(&vcdev->cdev->dev, "no info\n");
 495                 err = -ENOMEM;
 496                 goto out_err;
 497         }
 498         info->info_block = kzalloc(sizeof(*info->info_block),
 499                                    GFP_DMA | GFP_KERNEL);
 500         if (!info->info_block) {
 501                 dev_warn(&vcdev->cdev->dev, "no info block\n");
 502                 err = -ENOMEM;
 503                 goto out_err;
 504         }
 505         info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i);
 506         size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
 507         info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO);
 508         if (info->queue == NULL) {
 509                 dev_warn(&vcdev->cdev->dev, "no queue\n");
 510                 err = -ENOMEM;
 511                 goto out_err;
 512         }
 513
 514         vq = vring_new_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, vdev,
 515                                  true, info->queue, virtio_ccw_kvm_notify,
 516                                  callback, name);
 517         if (!vq) {
 518                 /* For now, we fail if we can't get the requested size. */
 519                 dev_warn(&vcdev->cdev->dev, "no vq\n");
 520                 err = -ENOMEM;
 521                 goto out_err;
 522         }
 523
 524         /* Register it with the host. */
 525         if (vcdev->revision == 0) {
 526                 info->info_block->l.queue = (__u64)info->queue;
 527                 info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN;
 528                 info->info_block->l.index = i;
 529                 info->info_block->l.num = info->num;
 530                 ccw->count = sizeof(info->info_block->l);
 531         } else {
 532                 info->info_block->s.desc = (__u64)info->queue;
 533                 info->info_block->s.index = i;
 534                 info->info_block->s.num = info->num;
 535                 info->info_block->s.avail = (__u64)virtqueue_get_avail(vq);
 536                 info->info_block->s.used = (__u64)virtqueue_get_used(vq);
 537                 ccw->count = sizeof(info->info_block->s);
 538         }
 539         ccw->cmd_code = CCW_CMD_SET_VQ;
 540         ccw->flags = 0;
 541         ccw->cda = (__u32)(unsigned long)(info->info_block);
 542         err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i);
 543         if (err) {
 544                 dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n");
 545                 goto out_err;
 546         }
 547
 548         info->vq = vq;
 549         vq->priv = info;
 550
 551         /* Save it to our list. */
 552         spin_lock_irqsave(&vcdev->lock, flags);
 553         list_add(&info->node, &vcdev->virtqueues);
 554         spin_unlock_irqrestore(&vcdev->lock, flags);
 555
 556         return vq;
 557
 558 out_err:
 559         if (vq)
 560                 vring_del_virtqueue(vq);
 561         if (info) {
 562                 if (info->queue)
 563                         free_pages_exact(info->queue, size);
 564                 kfree(info->info_block);
 565         }
 566         kfree(info);
 567         return ERR_PTR(err);
 568 }
 569
 570 static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev,
 571                                            struct virtqueue *vqs[], int nvqs,
 572                                            struct ccw1 *ccw)
 573 {
 574         int ret;
 575         struct virtio_thinint_area *thinint_area = NULL;
 576         struct airq_info *info;
 577
 578         thinint_area = kzalloc(sizeof(*thinint_area), GFP_DMA | GFP_KERNEL);
 579         if (!thinint_area) {
 580                 ret = -ENOMEM;
 581                 goto out;
 582         }
 583         /* Try to get an indicator. */
 584         thinint_area->indicator = get_airq_indicator(vqs, nvqs,
 585                                                      &thinint_area->bit_nr,
 586                                                      &vcdev->airq_info);
 587         if (!thinint_area->indicator) {
 588                 ret = -ENOSPC;
 589                 goto out;
 590         }
 591         info = vcdev->airq_info;
 592         thinint_area->summary_indicator =
 593                 (unsigned long) &info->summary_indicator;
 594         thinint_area->isc = VIRTIO_AIRQ_ISC;
 595         ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
 596         ccw->flags = CCW_FLAG_SLI;
 597         ccw->count = sizeof(*thinint_area);
 598         ccw->cda = (__u32)(unsigned long)thinint_area;
 599         ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER);
 600         if (ret) {
 601                 if (ret == -EOPNOTSUPP) {
 602                         /*
 603                          * The host does not support adapter interrupts
 604                          * for virtio-ccw, stop trying.
 605                          */
 606                         virtio_ccw_use_airq = 0;
 607                         pr_info("Adapter interrupts unsupported on host\n");
 608                 } else
 609                         dev_warn(&vcdev->cdev->dev,
 610                                  "enabling adapter interrupts = %d\n", ret);
 611                 virtio_ccw_drop_indicators(vcdev);
 612         }
 613 out:
 614         kfree(thinint_area);
 615         return ret;
 616 }
 617
 618 static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
 619                                struct virtqueue *vqs[],
 620                                vq_callback_t *callbacks[],
 621                                const char *names[])
 622 {
 623         struct virtio_ccw_device *vcdev = to_vc_device(vdev);
 624         unsigned long *indicatorp = NULL;
 625         int ret, i;
 626         struct ccw1 *ccw;
 627
 628         ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
 629         if (!ccw)
 630                 return -ENOMEM;
 631
 632         for (i = 0; i < nvqs; ++i) {
 633                 vqs[i] = virtio_ccw_setup_vq(vdev, i, callbacks[i], names[i],
 634                                              ccw);
 635                 if (IS_ERR(vqs[i])) {
 636                         ret = PTR_ERR(vqs[i]);
 637                         vqs[i] = NULL;
 638                         goto out;
 639                 }
 640         }
 641         ret = -ENOMEM;
 642         /* We need a data area under 2G to communicate. */
 643         indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL);
 644         if (!indicatorp)
 645                 goto out;
 646         *indicatorp = (unsigned long) &vcdev->indicators;
 647         if (vcdev->is_thinint) {
 648                 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw);
 649                 if (ret)
 650                         /* no error, just fall back to legacy interrupts */
 651                         vcdev->is_thinint = 0;
 652         }
 653         if (!vcdev->is_thinint) {
 654                 /* Register queue indicators with host. */
 655                 vcdev->indicators = 0;
 656                 ccw->cmd_code = CCW_CMD_SET_IND;
 657                 ccw->flags = 0;
 658                 ccw->count = sizeof(vcdev->indicators);
 659                 ccw->cda = (__u32)(unsigned long) indicatorp;
 660                 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND);
 661                 if (ret)
 662                         goto out;
 663         }
 664         /* Register indicators2 with host for config changes */
 665         *indicatorp = (unsigned long) &vcdev->indicators2;
 666         vcdev->indicators2 = 0;
 667         ccw->cmd_code = CCW_CMD_SET_CONF_IND;
 668         ccw->flags = 0;
 669         ccw->count = sizeof(vcdev->indicators2);
 670         ccw->cda = (__u32)(unsigned long) indicatorp;
 671         ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND);
 672         if (ret)
 673                 goto out;
 674
 675         kfree(indicatorp);
 676         kfree(ccw);
 677         return 0;
 678 out:
 679         kfree(indicatorp);
 680         kfree(ccw);
 681         virtio_ccw_del_vqs(vdev);
 682         return ret;
 683 }
 684
 685 static void virtio_ccw_reset(struct virtio_device *vdev)
 686 {
 687         struct virtio_ccw_device *vcdev = to_vc_device(vdev);
 688         struct ccw1 *ccw;
 689
 690         ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
 691         if (!ccw)
 692                 return;
 693
 694         /* Zero status bits. */
 695         *vcdev->status = 0;
 696
 697         /* Send a reset ccw on device. */
 698         ccw->cmd_code = CCW_CMD_VDEV_RESET;
 699         ccw->flags = 0;
 700         ccw->count = 0;
 701         ccw->cda = 0;
 702         ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET);
 703         kfree(ccw);
 704 }
 705
 706 static u64 virtio_ccw_get_features(struct virtio_device *vdev)
 707 {
 708         struct virtio_ccw_device *vcdev = to_vc_device(vdev);
 709         struct virtio_feature_desc *features;
 710         int ret;
 711         u64 rc;
 712         struct ccw1 *ccw;
 713
 714         ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
 715         if (!ccw)
 716                 return 0;
 717
 718         features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
 719         if (!features) {
 720                 rc = 0;
 721                 goto out_free;
 722         }
 723         /* Read the feature bits from the host. */
 724         features->index = 0;
 725         ccw->cmd_code = CCW_CMD_READ_FEAT;
 726         ccw->flags = 0;
 727         ccw->count = sizeof(*features);
 728         ccw->cda = (__u32)(unsigned long)features;
 729         ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
 730         if (ret) {
 731                 rc = 0;
 732                 goto out_free;
 733         }
 734
 735         rc = le32_to_cpu(features->features);
 736
 737         if (vcdev->revision == 0)
 738                 goto out_free;
 739
 740         /* Read second half of the feature bits from the host. */
 741         features->index = 1;
 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 == 0)
 748                 rc |= (u64)le32_to_cpu(features->features) << 32;
 749
 750 out_free:
 751         kfree(features);
 752         kfree(ccw);
 753         return rc;
 754 }
 755
 756 static int virtio_ccw_finalize_features(struct virtio_device *vdev)
 757 {
 758         struct virtio_ccw_device *vcdev = to_vc_device(vdev);
 759         struct virtio_feature_desc *features;
 760         struct ccw1 *ccw;
 761         int ret;
 762
 763         if (vcdev->revision >= 1 &&
 764             !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) {
 765                 dev_err(&vdev->dev, "virtio: device uses revision 1 "
 766                         "but does not have VIRTIO_F_VERSION_1\n");
 767                 return -EINVAL;
 768         }
 769
 770         ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
 771         if (!ccw)
 772                 return -ENOMEM;
 773
 774         features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
 775         if (!features) {
 776                 ret = -ENOMEM;
 777                 goto out_free;
 778         }
 779         /* Give virtio_ring a chance to accept features. */
 780         vring_transport_features(vdev);
 781
 782         features->index = 0;
 783         features->features = cpu_to_le32((u32)vdev->features);
 784         /* Write the first half of the feature bits to the host. */
 785         ccw->cmd_code = CCW_CMD_WRITE_FEAT;
 786         ccw->flags = 0;
 787         ccw->count = sizeof(*features);
 788         ccw->cda = (__u32)(unsigned long)features;
 789         ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
 790         if (ret)
 791                 goto out_free;
 792
 793         if (vcdev->revision == 0)
 794                 goto out_free;
 795
 796         features->index = 1;
 797         features->features = cpu_to_le32(vdev->features >> 32);
 798         /* Write the second half of the feature bits to the host. */
 799         ccw->cmd_code = CCW_CMD_WRITE_FEAT;
 800         ccw->flags = 0;
 801         ccw->count = sizeof(*features);
 802         ccw->cda = (__u32)(unsigned long)features;
 803         ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
 804
 805 out_free:
 806         kfree(features);
 807         kfree(ccw);
 808
 809         return ret;
 810 }
 811
 812 static void virtio_ccw_get_config(struct virtio_device *vdev,
 813                                   unsigned int offset, void *buf, unsigned len)
 814 {
 815         struct virtio_ccw_device *vcdev = to_vc_device(vdev);
 816         int ret;
 817         struct ccw1 *ccw;
 818         void *config_area;
 819
 820         ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
 821         if (!ccw)
 822                 return;
 823
 824         config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL);
 825         if (!config_area)
 826                 goto out_free;
 827
 828         /* Read the config area from the host. */
 829         ccw->cmd_code = CCW_CMD_READ_CONF;
 830         ccw->flags = 0;
 831         ccw->count = offset + len;
 832         ccw->cda = (__u32)(unsigned long)config_area;
 833         ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG);
 834         if (ret)
 835                 goto out_free;
 836
 837         memcpy(vcdev->config, config_area, offset + len);
 838         if (buf)
 839                 memcpy(buf, &vcdev->config[offset], len);
 840         if (vcdev->config_ready < offset + len)
 841                 vcdev->config_ready = offset + len;
 842
 843 out_free:
 844         kfree(config_area);
 845         kfree(ccw);
 846 }
 847
 848 static void virtio_ccw_set_config(struct virtio_device *vdev,
 849                                   unsigned int offset, const void *buf,
 850                                   unsigned len)
 851 {
 852         struct virtio_ccw_device *vcdev = to_vc_device(vdev);
 853         struct ccw1 *ccw;
 854         void *config_area;
 855
 856         ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
 857         if (!ccw)
 858                 return;
 859
 860         config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL);
 861         if (!config_area)
 862                 goto out_free;
 863
 864         /* Make sure we don't overwrite fields. */
 865         if (vcdev->config_ready < offset)
 866                 virtio_ccw_get_config(vdev, 0, NULL, offset);
 867         memcpy(&vcdev->config[offset], buf, len);
 868         /* Write the config area to the host. */
 869         memcpy(config_area, vcdev->config, sizeof(vcdev->config));
 870         ccw->cmd_code = CCW_CMD_WRITE_CONF;
 871         ccw->flags = 0;
 872         ccw->count = offset + len;
 873         ccw->cda = (__u32)(unsigned long)config_area;
 874         ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG);
 875
 876 out_free:
 877         kfree(config_area);
 878         kfree(ccw);
 879 }
 880
 881 static u8 virtio_ccw_get_status(struct virtio_device *vdev)
 882 {
 883         struct virtio_ccw_device *vcdev = to_vc_device(vdev);
 884
 885         return *vcdev->status;
 886 }
 887
 888 static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status)
 889 {
 890         struct virtio_ccw_device *vcdev = to_vc_device(vdev);
 891         u8 old_status = *vcdev->status;
 892         struct ccw1 *ccw;
 893         int ret;
 894
 895         ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
 896         if (!ccw)
 897                 return;
 898
 899         /* Write the status to the host. */
 900         *vcdev->status = status;
 901         ccw->cmd_code = CCW_CMD_WRITE_STATUS;
 902         ccw->flags = 0;
 903         ccw->count = sizeof(status);
 904         ccw->cda = (__u32)(unsigned long)vcdev->status;
 905         ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS);
 906         /* Write failed? We assume status is unchanged. */
 907         if (ret)
 908                 *vcdev->status = old_status;
 909         kfree(ccw);
 910 }
 911
 912 static struct virtio_config_ops virtio_ccw_config_ops = {
 913         .get_features = virtio_ccw_get_features,
 914         .finalize_features = virtio_ccw_finalize_features,
 915         .get = virtio_ccw_get_config,
 916         .set = virtio_ccw_set_config,
 917         .get_status = virtio_ccw_get_status,
 918         .set_status = virtio_ccw_set_status,
 919         .reset = virtio_ccw_reset,
 920         .find_vqs = virtio_ccw_find_vqs,
 921         .del_vqs = virtio_ccw_del_vqs,
 922 };
 923
 924
 925 /*
 926  * ccw bus driver related functions
 927  */
 928
 929 static void virtio_ccw_release_dev(struct device *_d)
 930 {
 931         struct virtio_device *dev = container_of(_d, struct virtio_device,
 932                                                  dev);
 933         struct virtio_ccw_device *vcdev = to_vc_device(dev);
 934
 935         kfree(vcdev->status);
 936         kfree(vcdev->config_block);
 937         kfree(vcdev);
 938 }
 939
 940 static int irb_is_error(struct irb *irb)
 941 {
 942         if (scsw_cstat(&irb->scsw) != 0)
 943                 return 1;
 944         if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))
 945                 return 1;
 946         if (scsw_cc(&irb->scsw) != 0)
 947                 return 1;
 948         return 0;
 949 }
 950
 951 static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev,
 952                                               int index)
 953 {
 954         struct virtio_ccw_vq_info *info;
 955         unsigned long flags;
 956         struct virtqueue *vq;
 957
 958         vq = NULL;
 959         spin_lock_irqsave(&vcdev->lock, flags);
 960         list_for_each_entry(info, &vcdev->virtqueues, node) {
 961                 if (info->vq->index == index) {
 962                         vq = info->vq;
 963                         break;
 964                 }
 965         }
 966         spin_unlock_irqrestore(&vcdev->lock, flags);
 967         return vq;
 968 }
 969
 970 static void virtio_ccw_int_handler(struct ccw_device *cdev,
 971                                    unsigned long intparm,
 972                                    struct irb *irb)
 973 {
 974         __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK;
 975         struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
 976         int i;
 977         struct virtqueue *vq;
 978
 979         if (!vcdev)
 980                 return;
 981         /* Check if it's a notification from the host. */
 982         if ((intparm == 0) &&
 983             (scsw_stctl(&irb->scsw) ==
 984              (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) {
 985                 /* OK */
 986         }
 987         if (irb_is_error(irb)) {
 988                 /* Command reject? */
 989                 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
 990                     (irb->ecw[0] & SNS0_CMD_REJECT))
 991                         vcdev->err = -EOPNOTSUPP;
 992                 else
 993                         /* Map everything else to -EIO. */
 994                         vcdev->err = -EIO;
 995         }
 996         if (vcdev->curr_io & activity) {
 997                 switch (activity) {
 998                 case VIRTIO_CCW_DOING_READ_FEAT:
 999                 case VIRTIO_CCW_DOING_WRITE_FEAT:
1000                 case VIRTIO_CCW_DOING_READ_CONFIG:
1001                 case VIRTIO_CCW_DOING_WRITE_CONFIG:
1002                 case VIRTIO_CCW_DOING_WRITE_STATUS:
1003                 case VIRTIO_CCW_DOING_SET_VQ:
1004                 case VIRTIO_CCW_DOING_SET_IND:
1005                 case VIRTIO_CCW_DOING_SET_CONF_IND:
1006                 case VIRTIO_CCW_DOING_RESET:
1007                 case VIRTIO_CCW_DOING_READ_VQ_CONF:
1008                 case VIRTIO_CCW_DOING_SET_IND_ADAPTER:
1009                 case VIRTIO_CCW_DOING_SET_VIRTIO_REV:
1010                         vcdev->curr_io &= ~activity;
1011                         wake_up(&vcdev->wait_q);
1012                         break;
1013                 default:
1014                         /* don't know what to do... */
1015                         dev_warn(&cdev->dev, "Suspicious activity '%08x'\n",
1016                                  activity);
1017                         WARN_ON(1);
1018                         break;
1019                 }
1020         }
1021         for_each_set_bit(i, &vcdev->indicators,
1022                          sizeof(vcdev->indicators) * BITS_PER_BYTE) {
1023                 /* The bit clear must happen before the vring kick. */
1024                 clear_bit(i, &vcdev->indicators);
1025                 barrier();
1026                 vq = virtio_ccw_vq_by_ind(vcdev, i);
1027                 vring_interrupt(0, vq);
1028         }
1029         if (test_bit(0, &vcdev->indicators2)) {
1030                 virtio_config_changed(&vcdev->vdev);
1031                 clear_bit(0, &vcdev->indicators2);
1032         }
1033 }
1034
1035 /*
1036  * We usually want to autoonline all devices, but give the admin
1037  * a way to exempt devices from this.
1038  */
1039 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
1040                      (8*sizeof(long)))
1041 static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS];
1042
1043 static char *no_auto = "";
1044
1045 module_param(no_auto, charp, 0444);
1046 MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined");
1047
1048 static int virtio_ccw_check_autoonline(struct ccw_device *cdev)
1049 {
1050         struct ccw_dev_id id;
1051
1052         ccw_device_get_id(cdev, &id);
1053         if (test_bit(id.devno, devs_no_auto[id.ssid]))
1054                 return 0;
1055         return 1;
1056 }
1057
1058 static void virtio_ccw_auto_online(void *data, async_cookie_t cookie)
1059 {
1060         struct ccw_device *cdev = data;
1061         int ret;
1062
1063         ret = ccw_device_set_online(cdev);
1064         if (ret)
1065                 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret);
1066 }
1067
1068 static int virtio_ccw_probe(struct ccw_device *cdev)
1069 {
1070         cdev->handler = virtio_ccw_int_handler;
1071
1072         if (virtio_ccw_check_autoonline(cdev))
1073                 async_schedule(virtio_ccw_auto_online, cdev);
1074         return 0;
1075 }
1076
1077 static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev)
1078 {
1079         unsigned long flags;
1080         struct virtio_ccw_device *vcdev;
1081
1082         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1083         vcdev = dev_get_drvdata(&cdev->dev);
1084         if (!vcdev || vcdev->going_away) {
1085                 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1086                 return NULL;
1087         }
1088         vcdev->going_away = true;
1089         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1090         return vcdev;
1091 }
1092
1093 static void virtio_ccw_remove(struct ccw_device *cdev)
1094 {
1095         unsigned long flags;
1096         struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
1097
1098         if (vcdev && cdev->online) {
1099                 if (vcdev->device_lost)
1100                         virtio_break_device(&vcdev->vdev);
1101                 unregister_virtio_device(&vcdev->vdev);
1102                 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1103                 dev_set_drvdata(&cdev->dev, NULL);
1104                 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1105         }
1106         cdev->handler = NULL;
1107 }
1108
1109 static int virtio_ccw_offline(struct ccw_device *cdev)
1110 {
1111         unsigned long flags;
1112         struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
1113
1114         if (!vcdev)
1115                 return 0;
1116         if (vcdev->device_lost)
1117                 virtio_break_device(&vcdev->vdev);
1118         unregister_virtio_device(&vcdev->vdev);
1119         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1120         dev_set_drvdata(&cdev->dev, NULL);
1121         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1122         return 0;
1123 }
1124
1125 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev)
1126 {
1127         struct virtio_rev_info *rev;
1128         struct ccw1 *ccw;
1129         int ret;
1130
1131         ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
1132         if (!ccw)
1133                 return -ENOMEM;
1134         rev = kzalloc(sizeof(*rev), GFP_DMA | GFP_KERNEL);
1135         if (!rev) {
1136                 kfree(ccw);
1137                 return -ENOMEM;
1138         }
1139
1140         /* Set transport revision */
1141         ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV;
1142         ccw->flags = 0;
1143         ccw->count = sizeof(*rev);
1144         ccw->cda = (__u32)(unsigned long)rev;
1145
1146         vcdev->revision = VIRTIO_CCW_REV_MAX;
1147         do {
1148                 rev->revision = vcdev->revision;
1149                 /* none of our supported revisions carry payload */
1150                 rev->length = 0;
1151                 ret = ccw_io_helper(vcdev, ccw,
1152                                     VIRTIO_CCW_DOING_SET_VIRTIO_REV);
1153                 if (ret == -EOPNOTSUPP) {
1154                         if (vcdev->revision == 0)
1155                                 /*
1156                                  * The host device does not support setting
1157                                  * the revision: let's operate it in legacy
1158                                  * mode.
1159                                  */
1160                                 ret = 0;
1161                         else
1162                                 vcdev->revision--;
1163                 }
1164         } while (ret == -EOPNOTSUPP);
1165
1166         kfree(ccw);
1167         kfree(rev);
1168         return ret;
1169 }
1170
1171 static int virtio_ccw_online(struct ccw_device *cdev)
1172 {
1173         int ret;
1174         struct virtio_ccw_device *vcdev;
1175         unsigned long flags;
1176
1177         vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL);
1178         if (!vcdev) {
1179                 dev_warn(&cdev->dev, "Could not get memory for virtio\n");
1180                 ret = -ENOMEM;
1181                 goto out_free;
1182         }
1183         vcdev->config_block = kzalloc(sizeof(*vcdev->config_block),
1184                                    GFP_DMA | GFP_KERNEL);
1185         if (!vcdev->config_block) {
1186                 ret = -ENOMEM;
1187                 goto out_free;
1188         }
1189         vcdev->status = kzalloc(sizeof(*vcdev->status), GFP_DMA | GFP_KERNEL);
1190         if (!vcdev->status) {
1191                 ret = -ENOMEM;
1192                 goto out_free;
1193         }
1194
1195         vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */
1196
1197         vcdev->vdev.dev.parent = &cdev->dev;
1198         vcdev->vdev.dev.release = virtio_ccw_release_dev;
1199         vcdev->vdev.config = &virtio_ccw_config_ops;
1200         vcdev->cdev = cdev;
1201         init_waitqueue_head(&vcdev->wait_q);
1202         INIT_LIST_HEAD(&vcdev->virtqueues);
1203         spin_lock_init(&vcdev->lock);
1204
1205         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1206         dev_set_drvdata(&cdev->dev, vcdev);
1207         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1208         vcdev->vdev.id.vendor = cdev->id.cu_type;
1209         vcdev->vdev.id.device = cdev->id.cu_model;
1210
1211         ret = virtio_ccw_set_transport_rev(vcdev);
1212         if (ret)
1213                 goto out_free;
1214
1215         ret = register_virtio_device(&vcdev->vdev);
1216         if (ret) {
1217                 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n",
1218                          ret);
1219                 goto out_put;
1220         }
1221         return 0;
1222 out_put:
1223         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1224         dev_set_drvdata(&cdev->dev, NULL);
1225         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1226         put_device(&vcdev->vdev.dev);
1227         return ret;
1228 out_free:
1229         if (vcdev) {
1230                 kfree(vcdev->status);
1231                 kfree(vcdev->config_block);
1232         }
1233         kfree(vcdev);
1234         return ret;
1235 }
1236
1237 static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event)
1238 {
1239         int rc;
1240         struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1241
1242         /*
1243          * Make sure vcdev is set
1244          * i.e. set_offline/remove callback not already running
1245          */
1246         if (!vcdev)
1247                 return NOTIFY_DONE;
1248
1249         switch (event) {
1250         case CIO_GONE:
1251                 vcdev->device_lost = true;
1252                 rc = NOTIFY_DONE;
1253                 break;
1254         default:
1255                 rc = NOTIFY_DONE;
1256                 break;
1257         }
1258         return rc;
1259 }
1260
1261 static struct ccw_device_id virtio_ids[] = {
1262         { CCW_DEVICE(0x3832, 0) },
1263         {},
1264 };
1265 MODULE_DEVICE_TABLE(ccw, virtio_ids);
1266
1267 static struct ccw_driver virtio_ccw_driver = {
1268         .driver = {
1269                 .owner = THIS_MODULE,
1270                 .name = "virtio_ccw",
1271         },
1272         .ids = virtio_ids,
1273         .probe = virtio_ccw_probe,
1274         .remove = virtio_ccw_remove,
1275         .set_offline = virtio_ccw_offline,
1276         .set_online = virtio_ccw_online,
1277         .notify = virtio_ccw_cio_notify,
1278         .int_class = IRQIO_VIR,
1279 };
1280
1281 static int __init pure_hex(char **cp, unsigned int *val, int min_digit,
1282                            int max_digit, int max_val)
1283 {
1284         int diff;
1285
1286         diff = 0;
1287         *val = 0;
1288
1289         while (diff <= max_digit) {
1290                 int value = hex_to_bin(**cp);
1291
1292                 if (value < 0)
1293                         break;
1294                 *val = *val * 16 + value;
1295                 (*cp)++;
1296                 diff++;
1297         }
1298
1299         if ((diff < min_digit) || (diff > max_digit) || (*val > max_val))
1300                 return 1;
1301
1302         return 0;
1303 }
1304
1305 static int __init parse_busid(char *str, unsigned int *cssid,
1306                               unsigned int *ssid, unsigned int *devno)
1307 {
1308         char *str_work;
1309         int rc, ret;
1310
1311         rc = 1;
1312
1313         if (*str == '\0')
1314                 goto out;
1315
1316         str_work = str;
1317         ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID);
1318         if (ret || (str_work[0] != '.'))
1319                 goto out;
1320         str_work++;
1321         ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID);
1322         if (ret || (str_work[0] != '.'))
1323                 goto out;
1324         str_work++;
1325         ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL);
1326         if (ret || (str_work[0] != '\0'))
1327                 goto out;
1328
1329         rc = 0;
1330 out:
1331         return rc;
1332 }
1333
1334 static void __init no_auto_parse(void)
1335 {
1336         unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to;
1337         char *parm, *str;
1338         int rc;
1339
1340         str = no_auto;
1341         while ((parm = strsep(&str, ","))) {
1342                 rc = parse_busid(strsep(&parm, "-"), &from_cssid,
1343                                  &from_ssid, &from);
1344                 if (rc)
1345                         continue;
1346                 if (parm != NULL) {
1347                         rc = parse_busid(parm, &to_cssid,
1348                                          &to_ssid, &to);
1349                         if ((from_ssid > to_ssid) ||
1350                             ((from_ssid == to_ssid) && (from > to)))
1351                                 rc = -EINVAL;
1352                 } else {
1353                         to_cssid = from_cssid;
1354                         to_ssid = from_ssid;
1355                         to = from;
1356                 }
1357                 if (rc)
1358                         continue;
1359                 while ((from_ssid < to_ssid) ||
1360                        ((from_ssid == to_ssid) && (from <= to))) {
1361                         set_bit(from, devs_no_auto[from_ssid]);
1362                         from++;
1363                         if (from > __MAX_SUBCHANNEL) {
1364                                 from_ssid++;
1365                                 from = 0;
1366                         }
1367                 }
1368         }
1369 }
1370
1371 static int __init virtio_ccw_init(void)
1372 {
1373         /* parse no_auto string before we do anything further */
1374         no_auto_parse();
1375         return ccw_driver_register(&virtio_ccw_driver);
1376 }
1377 module_init(virtio_ccw_init);
1378
1379 static void __exit virtio_ccw_exit(void)
1380 {
1381         int i;
1382
1383         ccw_driver_unregister(&virtio_ccw_driver);
1384         for (i = 0; i < MAX_AIRQ_AREAS; i++)
1385                 destroy_airq_info(airq_areas[i]);
1386 }
1387 module_exit(virtio_ccw_exit);