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/diag.h> 32 #include <asm/setup.h> 33 #include <asm/irq.h> 34 #include <asm/cio.h> 35 #include <asm/ccwdev.h> 36 #include <asm/virtio-ccw.h> 37 #include <asm/isc.h> 38 #include <asm/airq.h> 39 40 /* 41 * virtio related functions 42 */ 43 44 struct vq_config_block { 45 __u16 index; 46 __u16 num; 47 } __packed; 48 49 #define VIRTIO_CCW_CONFIG_SIZE 0x100 50 /* same as PCI config space size, should be enough for all drivers */ 51 52 struct virtio_ccw_device { 53 struct virtio_device vdev; 54 __u8 *status; 55 __u8 config[VIRTIO_CCW_CONFIG_SIZE]; 56 struct ccw_device *cdev; 57 __u32 curr_io; 58 int err; 59 unsigned int revision; /* Transport revision */ 60 wait_queue_head_t wait_q; 61 spinlock_t lock; 62 struct list_head virtqueues; 63 unsigned long indicators; 64 unsigned long indicators2; 65 struct vq_config_block *config_block; 66 bool is_thinint; 67 bool going_away; 68 bool device_lost; 69 unsigned int config_ready; 70 void *airq_info; 71 }; 72 73 struct vq_info_block_legacy { 74 __u64 queue; 75 __u32 align; 76 __u16 index; 77 __u16 num; 78 } __packed; 79 80 struct vq_info_block { 81 __u64 desc; 82 __u32 res0; 83 __u16 index; 84 __u16 num; 85 __u64 avail; 86 __u64 used; 87 } __packed; 88 89 struct virtio_feature_desc { 90 __u32 features; 91 __u8 index; 92 } __packed; 93 94 struct virtio_thinint_area { 95 unsigned long summary_indicator; 96 unsigned long indicator; 97 u64 bit_nr; 98 u8 isc; 99 } __packed; 100 101 struct virtio_rev_info { 102 __u16 revision; 103 __u16 length; 104 __u8 data[]; 105 }; 106 107 /* the highest virtio-ccw revision we support */ 108 #define VIRTIO_CCW_REV_MAX 1 109 110 struct virtio_ccw_vq_info { 111 struct virtqueue *vq; 112 int num; 113 void *queue; 114 union { 115 struct vq_info_block s; 116 struct vq_info_block_legacy l; 117 } *info_block; 118 int bit_nr; 119 struct list_head node; 120 long cookie; 121 }; 122 123 #define VIRTIO_AIRQ_ISC IO_SCH_ISC /* inherit from subchannel */ 124 125 #define VIRTIO_IV_BITS (L1_CACHE_BYTES * 8) 126 #define MAX_AIRQ_AREAS 20 127 128 static int virtio_ccw_use_airq = 1; 129 130 struct airq_info { 131 rwlock_t lock; 132 u8 summary_indicator; 133 struct airq_struct airq; 134 struct airq_iv *aiv; 135 }; 136 static struct airq_info *airq_areas[MAX_AIRQ_AREAS]; 137 138 #define CCW_CMD_SET_VQ 0x13 139 #define CCW_CMD_VDEV_RESET 0x33 140 #define CCW_CMD_SET_IND 0x43 141 #define CCW_CMD_SET_CONF_IND 0x53 142 #define CCW_CMD_READ_FEAT 0x12 143 #define CCW_CMD_WRITE_FEAT 0x11 144 #define CCW_CMD_READ_CONF 0x22 145 #define CCW_CMD_WRITE_CONF 0x21 146 #define CCW_CMD_WRITE_STATUS 0x31 147 #define CCW_CMD_READ_VQ_CONF 0x32 148 #define CCW_CMD_SET_IND_ADAPTER 0x73 149 #define CCW_CMD_SET_VIRTIO_REV 0x83 150 151 #define VIRTIO_CCW_DOING_SET_VQ 0x00010000 152 #define VIRTIO_CCW_DOING_RESET 0x00040000 153 #define VIRTIO_CCW_DOING_READ_FEAT 0x00080000 154 #define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000 155 #define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000 156 #define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000 157 #define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000 158 #define VIRTIO_CCW_DOING_SET_IND 0x01000000 159 #define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000 160 #define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000 161 #define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000 162 #define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000 163 #define VIRTIO_CCW_INTPARM_MASK 0xffff0000 164 165 static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev) 166 { 167 return container_of(vdev, struct virtio_ccw_device, vdev); 168 } 169 170 static void drop_airq_indicator(struct virtqueue *vq, struct airq_info *info) 171 { 172 unsigned long i, flags; 173 174 write_lock_irqsave(&info->lock, flags); 175 for (i = 0; i < airq_iv_end(info->aiv); i++) { 176 if (vq == (void *)airq_iv_get_ptr(info->aiv, i)) { 177 airq_iv_free_bit(info->aiv, i); 178 airq_iv_set_ptr(info->aiv, i, 0); 179 break; 180 } 181 } 182 write_unlock_irqrestore(&info->lock, flags); 183 } 184 185 static void virtio_airq_handler(struct airq_struct *airq) 186 { 187 struct airq_info *info = container_of(airq, struct airq_info, airq); 188 unsigned long ai; 189 190 inc_irq_stat(IRQIO_VAI); 191 read_lock(&info->lock); 192 /* Walk through indicators field, summary indicator active. */ 193 for (ai = 0;;) { 194 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv)); 195 if (ai == -1UL) 196 break; 197 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai)); 198 } 199 info->summary_indicator = 0; 200 smp_wmb(); 201 /* Walk through indicators field, summary indicator not active. */ 202 for (ai = 0;;) { 203 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv)); 204 if (ai == -1UL) 205 break; 206 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai)); 207 } 208 read_unlock(&info->lock); 209 } 210 211 static struct airq_info *new_airq_info(void) 212 { 213 struct airq_info *info; 214 int rc; 215 216 info = kzalloc(sizeof(*info), GFP_KERNEL); 217 if (!info) 218 return NULL; 219 rwlock_init(&info->lock); 220 info->aiv = airq_iv_create(VIRTIO_IV_BITS, AIRQ_IV_ALLOC | AIRQ_IV_PTR); 221 if (!info->aiv) { 222 kfree(info); 223 return NULL; 224 } 225 info->airq.handler = virtio_airq_handler; 226 info->airq.lsi_ptr = &info->summary_indicator; 227 info->airq.lsi_mask = 0xff; 228 info->airq.isc = VIRTIO_AIRQ_ISC; 229 rc = register_adapter_interrupt(&info->airq); 230 if (rc) { 231 airq_iv_release(info->aiv); 232 kfree(info); 233 return NULL; 234 } 235 return info; 236 } 237 238 static void destroy_airq_info(struct airq_info *info) 239 { 240 if (!info) 241 return; 242 243 unregister_adapter_interrupt(&info->airq); 244 airq_iv_release(info->aiv); 245 kfree(info); 246 } 247 248 static unsigned long get_airq_indicator(struct virtqueue *vqs[], int nvqs, 249 u64 *first, void **airq_info) 250 { 251 int i, j; 252 struct airq_info *info; 253 unsigned long indicator_addr = 0; 254 unsigned long bit, flags; 255 256 for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) { 257 if (!airq_areas[i]) 258 airq_areas[i] = new_airq_info(); 259 info = airq_areas[i]; 260 if (!info) 261 return 0; 262 write_lock_irqsave(&info->lock, flags); 263 bit = airq_iv_alloc(info->aiv, nvqs); 264 if (bit == -1UL) { 265 /* Not enough vacancies. */ 266 write_unlock_irqrestore(&info->lock, flags); 267 continue; 268 } 269 *first = bit; 270 *airq_info = info; 271 indicator_addr = (unsigned long)info->aiv->vector; 272 for (j = 0; j < nvqs; j++) { 273 airq_iv_set_ptr(info->aiv, bit + j, 274 (unsigned long)vqs[j]); 275 } 276 write_unlock_irqrestore(&info->lock, flags); 277 } 278 return indicator_addr; 279 } 280 281 static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev) 282 { 283 struct virtio_ccw_vq_info *info; 284 285 list_for_each_entry(info, &vcdev->virtqueues, node) 286 drop_airq_indicator(info->vq, vcdev->airq_info); 287 } 288 289 static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag) 290 { 291 unsigned long flags; 292 __u32 ret; 293 294 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); 295 if (vcdev->err) 296 ret = 0; 297 else 298 ret = vcdev->curr_io & flag; 299 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); 300 return ret; 301 } 302 303 static int ccw_io_helper(struct virtio_ccw_device *vcdev, 304 struct ccw1 *ccw, __u32 intparm) 305 { 306 int ret; 307 unsigned long flags; 308 int flag = intparm & VIRTIO_CCW_INTPARM_MASK; 309 310 do { 311 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); 312 ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0); 313 if (!ret) { 314 if (!vcdev->curr_io) 315 vcdev->err = 0; 316 vcdev->curr_io |= flag; 317 } 318 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); 319 cpu_relax(); 320 } while (ret == -EBUSY); 321 wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0); 322 return ret ? ret : vcdev->err; 323 } 324 325 static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev, 326 struct ccw1 *ccw) 327 { 328 int ret; 329 unsigned long *indicatorp = NULL; 330 struct virtio_thinint_area *thinint_area = NULL; 331 struct airq_info *airq_info = vcdev->airq_info; 332 333 if (vcdev->is_thinint) { 334 thinint_area = kzalloc(sizeof(*thinint_area), 335 GFP_DMA | GFP_KERNEL); 336 if (!thinint_area) 337 return; 338 thinint_area->summary_indicator = 339 (unsigned long) &airq_info->summary_indicator; 340 thinint_area->isc = VIRTIO_AIRQ_ISC; 341 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; 342 ccw->count = sizeof(*thinint_area); 343 ccw->cda = (__u32)(unsigned long) thinint_area; 344 } else { 345 indicatorp = kmalloc(sizeof(&vcdev->indicators), 346 GFP_DMA | GFP_KERNEL); 347 if (!indicatorp) 348 return; 349 *indicatorp = 0; 350 ccw->cmd_code = CCW_CMD_SET_IND; 351 ccw->count = sizeof(vcdev->indicators); 352 ccw->cda = (__u32)(unsigned long) indicatorp; 353 } 354 /* Deregister indicators from host. */ 355 vcdev->indicators = 0; 356 ccw->flags = 0; 357 ret = ccw_io_helper(vcdev, ccw, 358 vcdev->is_thinint ? 359 VIRTIO_CCW_DOING_SET_IND_ADAPTER : 360 VIRTIO_CCW_DOING_SET_IND); 361 if (ret && (ret != -ENODEV)) 362 dev_info(&vcdev->cdev->dev, 363 "Failed to deregister indicators (%d)\n", ret); 364 else if (vcdev->is_thinint) 365 virtio_ccw_drop_indicators(vcdev); 366 kfree(indicatorp); 367 kfree(thinint_area); 368 } 369 370 static inline long __do_kvm_notify(struct subchannel_id schid, 371 unsigned long queue_index, 372 long cookie) 373 { 374 register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY; 375 register struct subchannel_id __schid asm("2") = schid; 376 register unsigned long __index asm("3") = queue_index; 377 register long __rc asm("2"); 378 register long __cookie asm("4") = cookie; 379 380 asm volatile ("diag 2,4,0x500\n" 381 : "=d" (__rc) : "d" (__nr), "d" (__schid), "d" (__index), 382 "d"(__cookie) 383 : "memory", "cc"); 384 return __rc; 385 } 386 387 static inline long do_kvm_notify(struct subchannel_id schid, 388 unsigned long queue_index, 389 long cookie) 390 { 391 diag_stat_inc(DIAG_STAT_X500); 392 return __do_kvm_notify(schid, queue_index, cookie); 393 } 394 395 static bool virtio_ccw_kvm_notify(struct virtqueue *vq) 396 { 397 struct virtio_ccw_vq_info *info = vq->priv; 398 struct virtio_ccw_device *vcdev; 399 struct subchannel_id schid; 400 401 vcdev = to_vc_device(info->vq->vdev); 402 ccw_device_get_schid(vcdev->cdev, &schid); 403 info->cookie = do_kvm_notify(schid, vq->index, info->cookie); 404 if (info->cookie < 0) 405 return false; 406 return true; 407 } 408 409 static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev, 410 struct ccw1 *ccw, int index) 411 { 412 int ret; 413 414 vcdev->config_block->index = index; 415 ccw->cmd_code = CCW_CMD_READ_VQ_CONF; 416 ccw->flags = 0; 417 ccw->count = sizeof(struct vq_config_block); 418 ccw->cda = (__u32)(unsigned long)(vcdev->config_block); 419 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF); 420 if (ret) 421 return ret; 422 return vcdev->config_block->num; 423 } 424 425 static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw) 426 { 427 struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev); 428 struct virtio_ccw_vq_info *info = vq->priv; 429 unsigned long flags; 430 unsigned long size; 431 int ret; 432 unsigned int index = vq->index; 433 434 /* Remove from our list. */ 435 spin_lock_irqsave(&vcdev->lock, flags); 436 list_del(&info->node); 437 spin_unlock_irqrestore(&vcdev->lock, flags); 438 439 /* Release from host. */ 440 if (vcdev->revision == 0) { 441 info->info_block->l.queue = 0; 442 info->info_block->l.align = 0; 443 info->info_block->l.index = index; 444 info->info_block->l.num = 0; 445 ccw->count = sizeof(info->info_block->l); 446 } else { 447 info->info_block->s.desc = 0; 448 info->info_block->s.index = index; 449 info->info_block->s.num = 0; 450 info->info_block->s.avail = 0; 451 info->info_block->s.used = 0; 452 ccw->count = sizeof(info->info_block->s); 453 } 454 ccw->cmd_code = CCW_CMD_SET_VQ; 455 ccw->flags = 0; 456 ccw->cda = (__u32)(unsigned long)(info->info_block); 457 ret = ccw_io_helper(vcdev, ccw, 458 VIRTIO_CCW_DOING_SET_VQ | index); 459 /* 460 * -ENODEV isn't considered an error: The device is gone anyway. 461 * This may happen on device detach. 462 */ 463 if (ret && (ret != -ENODEV)) 464 dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d", 465 ret, index); 466 467 vring_del_virtqueue(vq); 468 size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN)); 469 free_pages_exact(info->queue, size); 470 kfree(info->info_block); 471 kfree(info); 472 } 473 474 static void virtio_ccw_del_vqs(struct virtio_device *vdev) 475 { 476 struct virtqueue *vq, *n; 477 struct ccw1 *ccw; 478 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 479 480 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 481 if (!ccw) 482 return; 483 484 virtio_ccw_drop_indicator(vcdev, ccw); 485 486 list_for_each_entry_safe(vq, n, &vdev->vqs, list) 487 virtio_ccw_del_vq(vq, ccw); 488 489 kfree(ccw); 490 } 491 492 static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev, 493 int i, vq_callback_t *callback, 494 const char *name, 495 struct ccw1 *ccw) 496 { 497 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 498 int err; 499 struct virtqueue *vq = NULL; 500 struct virtio_ccw_vq_info *info; 501 unsigned long size = 0; /* silence the compiler */ 502 unsigned long flags; 503 504 /* Allocate queue. */ 505 info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL); 506 if (!info) { 507 dev_warn(&vcdev->cdev->dev, "no info\n"); 508 err = -ENOMEM; 509 goto out_err; 510 } 511 info->info_block = kzalloc(sizeof(*info->info_block), 512 GFP_DMA | GFP_KERNEL); 513 if (!info->info_block) { 514 dev_warn(&vcdev->cdev->dev, "no info block\n"); 515 err = -ENOMEM; 516 goto out_err; 517 } 518 info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i); 519 if (info->num < 0) { 520 err = info->num; 521 goto out_err; 522 } 523 size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN)); 524 info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO); 525 if (info->queue == NULL) { 526 dev_warn(&vcdev->cdev->dev, "no queue\n"); 527 err = -ENOMEM; 528 goto out_err; 529 } 530 531 vq = vring_new_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, vdev, 532 true, info->queue, virtio_ccw_kvm_notify, 533 callback, name); 534 if (!vq) { 535 /* For now, we fail if we can't get the requested size. */ 536 dev_warn(&vcdev->cdev->dev, "no vq\n"); 537 err = -ENOMEM; 538 goto out_err; 539 } 540 541 /* Register it with the host. */ 542 if (vcdev->revision == 0) { 543 info->info_block->l.queue = (__u64)info->queue; 544 info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN; 545 info->info_block->l.index = i; 546 info->info_block->l.num = info->num; 547 ccw->count = sizeof(info->info_block->l); 548 } else { 549 info->info_block->s.desc = (__u64)info->queue; 550 info->info_block->s.index = i; 551 info->info_block->s.num = info->num; 552 info->info_block->s.avail = (__u64)virtqueue_get_avail(vq); 553 info->info_block->s.used = (__u64)virtqueue_get_used(vq); 554 ccw->count = sizeof(info->info_block->s); 555 } 556 ccw->cmd_code = CCW_CMD_SET_VQ; 557 ccw->flags = 0; 558 ccw->cda = (__u32)(unsigned long)(info->info_block); 559 err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i); 560 if (err) { 561 dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n"); 562 goto out_err; 563 } 564 565 info->vq = vq; 566 vq->priv = info; 567 568 /* Save it to our list. */ 569 spin_lock_irqsave(&vcdev->lock, flags); 570 list_add(&info->node, &vcdev->virtqueues); 571 spin_unlock_irqrestore(&vcdev->lock, flags); 572 573 return vq; 574 575 out_err: 576 if (vq) 577 vring_del_virtqueue(vq); 578 if (info) { 579 if (info->queue) 580 free_pages_exact(info->queue, size); 581 kfree(info->info_block); 582 } 583 kfree(info); 584 return ERR_PTR(err); 585 } 586 587 static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev, 588 struct virtqueue *vqs[], int nvqs, 589 struct ccw1 *ccw) 590 { 591 int ret; 592 struct virtio_thinint_area *thinint_area = NULL; 593 struct airq_info *info; 594 595 thinint_area = kzalloc(sizeof(*thinint_area), GFP_DMA | GFP_KERNEL); 596 if (!thinint_area) { 597 ret = -ENOMEM; 598 goto out; 599 } 600 /* Try to get an indicator. */ 601 thinint_area->indicator = get_airq_indicator(vqs, nvqs, 602 &thinint_area->bit_nr, 603 &vcdev->airq_info); 604 if (!thinint_area->indicator) { 605 ret = -ENOSPC; 606 goto out; 607 } 608 info = vcdev->airq_info; 609 thinint_area->summary_indicator = 610 (unsigned long) &info->summary_indicator; 611 thinint_area->isc = VIRTIO_AIRQ_ISC; 612 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; 613 ccw->flags = CCW_FLAG_SLI; 614 ccw->count = sizeof(*thinint_area); 615 ccw->cda = (__u32)(unsigned long)thinint_area; 616 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER); 617 if (ret) { 618 if (ret == -EOPNOTSUPP) { 619 /* 620 * The host does not support adapter interrupts 621 * for virtio-ccw, stop trying. 622 */ 623 virtio_ccw_use_airq = 0; 624 pr_info("Adapter interrupts unsupported on host\n"); 625 } else 626 dev_warn(&vcdev->cdev->dev, 627 "enabling adapter interrupts = %d\n", ret); 628 virtio_ccw_drop_indicators(vcdev); 629 } 630 out: 631 kfree(thinint_area); 632 return ret; 633 } 634 635 static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, 636 struct virtqueue *vqs[], 637 vq_callback_t *callbacks[], 638 const char * const names[]) 639 { 640 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 641 unsigned long *indicatorp = NULL; 642 int ret, i; 643 struct ccw1 *ccw; 644 645 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 646 if (!ccw) 647 return -ENOMEM; 648 649 for (i = 0; i < nvqs; ++i) { 650 vqs[i] = virtio_ccw_setup_vq(vdev, i, callbacks[i], names[i], 651 ccw); 652 if (IS_ERR(vqs[i])) { 653 ret = PTR_ERR(vqs[i]); 654 vqs[i] = NULL; 655 goto out; 656 } 657 } 658 ret = -ENOMEM; 659 /* We need a data area under 2G to communicate. */ 660 indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL); 661 if (!indicatorp) 662 goto out; 663 *indicatorp = (unsigned long) &vcdev->indicators; 664 if (vcdev->is_thinint) { 665 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw); 666 if (ret) 667 /* no error, just fall back to legacy interrupts */ 668 vcdev->is_thinint = 0; 669 } 670 if (!vcdev->is_thinint) { 671 /* Register queue indicators with host. */ 672 vcdev->indicators = 0; 673 ccw->cmd_code = CCW_CMD_SET_IND; 674 ccw->flags = 0; 675 ccw->count = sizeof(vcdev->indicators); 676 ccw->cda = (__u32)(unsigned long) indicatorp; 677 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND); 678 if (ret) 679 goto out; 680 } 681 /* Register indicators2 with host for config changes */ 682 *indicatorp = (unsigned long) &vcdev->indicators2; 683 vcdev->indicators2 = 0; 684 ccw->cmd_code = CCW_CMD_SET_CONF_IND; 685 ccw->flags = 0; 686 ccw->count = sizeof(vcdev->indicators2); 687 ccw->cda = (__u32)(unsigned long) indicatorp; 688 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND); 689 if (ret) 690 goto out; 691 692 kfree(indicatorp); 693 kfree(ccw); 694 return 0; 695 out: 696 kfree(indicatorp); 697 kfree(ccw); 698 virtio_ccw_del_vqs(vdev); 699 return ret; 700 } 701 702 static void virtio_ccw_reset(struct virtio_device *vdev) 703 { 704 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 705 struct ccw1 *ccw; 706 707 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 708 if (!ccw) 709 return; 710 711 /* Zero status bits. */ 712 *vcdev->status = 0; 713 714 /* Send a reset ccw on device. */ 715 ccw->cmd_code = CCW_CMD_VDEV_RESET; 716 ccw->flags = 0; 717 ccw->count = 0; 718 ccw->cda = 0; 719 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET); 720 kfree(ccw); 721 } 722 723 static u64 virtio_ccw_get_features(struct virtio_device *vdev) 724 { 725 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 726 struct virtio_feature_desc *features; 727 int ret; 728 u64 rc; 729 struct ccw1 *ccw; 730 731 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 732 if (!ccw) 733 return 0; 734 735 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL); 736 if (!features) { 737 rc = 0; 738 goto out_free; 739 } 740 /* Read the feature bits from the host. */ 741 features->index = 0; 742 ccw->cmd_code = CCW_CMD_READ_FEAT; 743 ccw->flags = 0; 744 ccw->count = sizeof(*features); 745 ccw->cda = (__u32)(unsigned long)features; 746 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 747 if (ret) { 748 rc = 0; 749 goto out_free; 750 } 751 752 rc = le32_to_cpu(features->features); 753 754 if (vcdev->revision == 0) 755 goto out_free; 756 757 /* Read second half of the feature bits from the host. */ 758 features->index = 1; 759 ccw->cmd_code = CCW_CMD_READ_FEAT; 760 ccw->flags = 0; 761 ccw->count = sizeof(*features); 762 ccw->cda = (__u32)(unsigned long)features; 763 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 764 if (ret == 0) 765 rc |= (u64)le32_to_cpu(features->features) << 32; 766 767 out_free: 768 kfree(features); 769 kfree(ccw); 770 return rc; 771 } 772 773 static int virtio_ccw_finalize_features(struct virtio_device *vdev) 774 { 775 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 776 struct virtio_feature_desc *features; 777 struct ccw1 *ccw; 778 int ret; 779 780 if (vcdev->revision >= 1 && 781 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { 782 dev_err(&vdev->dev, "virtio: device uses revision 1 " 783 "but does not have VIRTIO_F_VERSION_1\n"); 784 return -EINVAL; 785 } 786 787 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 788 if (!ccw) 789 return -ENOMEM; 790 791 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL); 792 if (!features) { 793 ret = -ENOMEM; 794 goto out_free; 795 } 796 /* Give virtio_ring a chance to accept features. */ 797 vring_transport_features(vdev); 798 799 features->index = 0; 800 features->features = cpu_to_le32((u32)vdev->features); 801 /* Write the first half of the feature bits to the host. */ 802 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 803 ccw->flags = 0; 804 ccw->count = sizeof(*features); 805 ccw->cda = (__u32)(unsigned long)features; 806 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 807 if (ret) 808 goto out_free; 809 810 if (vcdev->revision == 0) 811 goto out_free; 812 813 features->index = 1; 814 features->features = cpu_to_le32(vdev->features >> 32); 815 /* Write the second half of the feature bits to the host. */ 816 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 817 ccw->flags = 0; 818 ccw->count = sizeof(*features); 819 ccw->cda = (__u32)(unsigned long)features; 820 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 821 822 out_free: 823 kfree(features); 824 kfree(ccw); 825 826 return ret; 827 } 828 829 static void virtio_ccw_get_config(struct virtio_device *vdev, 830 unsigned int offset, void *buf, unsigned len) 831 { 832 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 833 int ret; 834 struct ccw1 *ccw; 835 void *config_area; 836 837 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 838 if (!ccw) 839 return; 840 841 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL); 842 if (!config_area) 843 goto out_free; 844 845 /* Read the config area from the host. */ 846 ccw->cmd_code = CCW_CMD_READ_CONF; 847 ccw->flags = 0; 848 ccw->count = offset + len; 849 ccw->cda = (__u32)(unsigned long)config_area; 850 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG); 851 if (ret) 852 goto out_free; 853 854 memcpy(vcdev->config, config_area, offset + len); 855 if (buf) 856 memcpy(buf, &vcdev->config[offset], len); 857 if (vcdev->config_ready < offset + len) 858 vcdev->config_ready = offset + len; 859 860 out_free: 861 kfree(config_area); 862 kfree(ccw); 863 } 864 865 static void virtio_ccw_set_config(struct virtio_device *vdev, 866 unsigned int offset, const void *buf, 867 unsigned len) 868 { 869 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 870 struct ccw1 *ccw; 871 void *config_area; 872 873 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 874 if (!ccw) 875 return; 876 877 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL); 878 if (!config_area) 879 goto out_free; 880 881 /* Make sure we don't overwrite fields. */ 882 if (vcdev->config_ready < offset) 883 virtio_ccw_get_config(vdev, 0, NULL, offset); 884 memcpy(&vcdev->config[offset], buf, len); 885 /* Write the config area to the host. */ 886 memcpy(config_area, vcdev->config, sizeof(vcdev->config)); 887 ccw->cmd_code = CCW_CMD_WRITE_CONF; 888 ccw->flags = 0; 889 ccw->count = offset + len; 890 ccw->cda = (__u32)(unsigned long)config_area; 891 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG); 892 893 out_free: 894 kfree(config_area); 895 kfree(ccw); 896 } 897 898 static u8 virtio_ccw_get_status(struct virtio_device *vdev) 899 { 900 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 901 902 return *vcdev->status; 903 } 904 905 static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status) 906 { 907 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 908 u8 old_status = *vcdev->status; 909 struct ccw1 *ccw; 910 int ret; 911 912 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 913 if (!ccw) 914 return; 915 916 /* Write the status to the host. */ 917 *vcdev->status = status; 918 ccw->cmd_code = CCW_CMD_WRITE_STATUS; 919 ccw->flags = 0; 920 ccw->count = sizeof(status); 921 ccw->cda = (__u32)(unsigned long)vcdev->status; 922 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS); 923 /* Write failed? We assume status is unchanged. */ 924 if (ret) 925 *vcdev->status = old_status; 926 kfree(ccw); 927 } 928 929 static struct virtio_config_ops virtio_ccw_config_ops = { 930 .get_features = virtio_ccw_get_features, 931 .finalize_features = virtio_ccw_finalize_features, 932 .get = virtio_ccw_get_config, 933 .set = virtio_ccw_set_config, 934 .get_status = virtio_ccw_get_status, 935 .set_status = virtio_ccw_set_status, 936 .reset = virtio_ccw_reset, 937 .find_vqs = virtio_ccw_find_vqs, 938 .del_vqs = virtio_ccw_del_vqs, 939 }; 940 941 942 /* 943 * ccw bus driver related functions 944 */ 945 946 static void virtio_ccw_release_dev(struct device *_d) 947 { 948 struct virtio_device *dev = container_of(_d, struct virtio_device, 949 dev); 950 struct virtio_ccw_device *vcdev = to_vc_device(dev); 951 952 kfree(vcdev->status); 953 kfree(vcdev->config_block); 954 kfree(vcdev); 955 } 956 957 static int irb_is_error(struct irb *irb) 958 { 959 if (scsw_cstat(&irb->scsw) != 0) 960 return 1; 961 if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) 962 return 1; 963 if (scsw_cc(&irb->scsw) != 0) 964 return 1; 965 return 0; 966 } 967 968 static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev, 969 int index) 970 { 971 struct virtio_ccw_vq_info *info; 972 unsigned long flags; 973 struct virtqueue *vq; 974 975 vq = NULL; 976 spin_lock_irqsave(&vcdev->lock, flags); 977 list_for_each_entry(info, &vcdev->virtqueues, node) { 978 if (info->vq->index == index) { 979 vq = info->vq; 980 break; 981 } 982 } 983 spin_unlock_irqrestore(&vcdev->lock, flags); 984 return vq; 985 } 986 987 static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev, 988 __u32 activity) 989 { 990 if (vcdev->curr_io & activity) { 991 switch (activity) { 992 case VIRTIO_CCW_DOING_READ_FEAT: 993 case VIRTIO_CCW_DOING_WRITE_FEAT: 994 case VIRTIO_CCW_DOING_READ_CONFIG: 995 case VIRTIO_CCW_DOING_WRITE_CONFIG: 996 case VIRTIO_CCW_DOING_WRITE_STATUS: 997 case VIRTIO_CCW_DOING_SET_VQ: 998 case VIRTIO_CCW_DOING_SET_IND: 999 case VIRTIO_CCW_DOING_SET_CONF_IND: 1000 case VIRTIO_CCW_DOING_RESET: 1001 case VIRTIO_CCW_DOING_READ_VQ_CONF: 1002 case VIRTIO_CCW_DOING_SET_IND_ADAPTER: 1003 case VIRTIO_CCW_DOING_SET_VIRTIO_REV: 1004 vcdev->curr_io &= ~activity; 1005 wake_up(&vcdev->wait_q); 1006 break; 1007 default: 1008 /* don't know what to do... */ 1009 dev_warn(&vcdev->cdev->dev, 1010 "Suspicious activity '%08x'\n", activity); 1011 WARN_ON(1); 1012 break; 1013 } 1014 } 1015 } 1016 1017 static void virtio_ccw_int_handler(struct ccw_device *cdev, 1018 unsigned long intparm, 1019 struct irb *irb) 1020 { 1021 __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK; 1022 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1023 int i; 1024 struct virtqueue *vq; 1025 1026 if (!vcdev) 1027 return; 1028 if (IS_ERR(irb)) { 1029 vcdev->err = PTR_ERR(irb); 1030 virtio_ccw_check_activity(vcdev, activity); 1031 /* Don't poke around indicators, something's wrong. */ 1032 return; 1033 } 1034 /* Check if it's a notification from the host. */ 1035 if ((intparm == 0) && 1036 (scsw_stctl(&irb->scsw) == 1037 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) { 1038 /* OK */ 1039 } 1040 if (irb_is_error(irb)) { 1041 /* Command reject? */ 1042 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) && 1043 (irb->ecw[0] & SNS0_CMD_REJECT)) 1044 vcdev->err = -EOPNOTSUPP; 1045 else 1046 /* Map everything else to -EIO. */ 1047 vcdev->err = -EIO; 1048 } 1049 virtio_ccw_check_activity(vcdev, activity); 1050 for_each_set_bit(i, &vcdev->indicators, 1051 sizeof(vcdev->indicators) * BITS_PER_BYTE) { 1052 /* The bit clear must happen before the vring kick. */ 1053 clear_bit(i, &vcdev->indicators); 1054 barrier(); 1055 vq = virtio_ccw_vq_by_ind(vcdev, i); 1056 vring_interrupt(0, vq); 1057 } 1058 if (test_bit(0, &vcdev->indicators2)) { 1059 virtio_config_changed(&vcdev->vdev); 1060 clear_bit(0, &vcdev->indicators2); 1061 } 1062 } 1063 1064 /* 1065 * We usually want to autoonline all devices, but give the admin 1066 * a way to exempt devices from this. 1067 */ 1068 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ 1069 (8*sizeof(long))) 1070 static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS]; 1071 1072 static char *no_auto = ""; 1073 1074 module_param(no_auto, charp, 0444); 1075 MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined"); 1076 1077 static int virtio_ccw_check_autoonline(struct ccw_device *cdev) 1078 { 1079 struct ccw_dev_id id; 1080 1081 ccw_device_get_id(cdev, &id); 1082 if (test_bit(id.devno, devs_no_auto[id.ssid])) 1083 return 0; 1084 return 1; 1085 } 1086 1087 static void virtio_ccw_auto_online(void *data, async_cookie_t cookie) 1088 { 1089 struct ccw_device *cdev = data; 1090 int ret; 1091 1092 ret = ccw_device_set_online(cdev); 1093 if (ret) 1094 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret); 1095 } 1096 1097 static int virtio_ccw_probe(struct ccw_device *cdev) 1098 { 1099 cdev->handler = virtio_ccw_int_handler; 1100 1101 if (virtio_ccw_check_autoonline(cdev)) 1102 async_schedule(virtio_ccw_auto_online, cdev); 1103 return 0; 1104 } 1105 1106 static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev) 1107 { 1108 unsigned long flags; 1109 struct virtio_ccw_device *vcdev; 1110 1111 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1112 vcdev = dev_get_drvdata(&cdev->dev); 1113 if (!vcdev || vcdev->going_away) { 1114 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1115 return NULL; 1116 } 1117 vcdev->going_away = true; 1118 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1119 return vcdev; 1120 } 1121 1122 static void virtio_ccw_remove(struct ccw_device *cdev) 1123 { 1124 unsigned long flags; 1125 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1126 1127 if (vcdev && cdev->online) { 1128 if (vcdev->device_lost) 1129 virtio_break_device(&vcdev->vdev); 1130 unregister_virtio_device(&vcdev->vdev); 1131 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1132 dev_set_drvdata(&cdev->dev, NULL); 1133 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1134 } 1135 cdev->handler = NULL; 1136 } 1137 1138 static int virtio_ccw_offline(struct ccw_device *cdev) 1139 { 1140 unsigned long flags; 1141 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1142 1143 if (!vcdev) 1144 return 0; 1145 if (vcdev->device_lost) 1146 virtio_break_device(&vcdev->vdev); 1147 unregister_virtio_device(&vcdev->vdev); 1148 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1149 dev_set_drvdata(&cdev->dev, NULL); 1150 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1151 return 0; 1152 } 1153 1154 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev) 1155 { 1156 struct virtio_rev_info *rev; 1157 struct ccw1 *ccw; 1158 int ret; 1159 1160 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 1161 if (!ccw) 1162 return -ENOMEM; 1163 rev = kzalloc(sizeof(*rev), GFP_DMA | GFP_KERNEL); 1164 if (!rev) { 1165 kfree(ccw); 1166 return -ENOMEM; 1167 } 1168 1169 /* Set transport revision */ 1170 ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV; 1171 ccw->flags = 0; 1172 ccw->count = sizeof(*rev); 1173 ccw->cda = (__u32)(unsigned long)rev; 1174 1175 vcdev->revision = VIRTIO_CCW_REV_MAX; 1176 do { 1177 rev->revision = vcdev->revision; 1178 /* none of our supported revisions carry payload */ 1179 rev->length = 0; 1180 ret = ccw_io_helper(vcdev, ccw, 1181 VIRTIO_CCW_DOING_SET_VIRTIO_REV); 1182 if (ret == -EOPNOTSUPP) { 1183 if (vcdev->revision == 0) 1184 /* 1185 * The host device does not support setting 1186 * the revision: let's operate it in legacy 1187 * mode. 1188 */ 1189 ret = 0; 1190 else 1191 vcdev->revision--; 1192 } 1193 } while (ret == -EOPNOTSUPP); 1194 1195 kfree(ccw); 1196 kfree(rev); 1197 return ret; 1198 } 1199 1200 static int virtio_ccw_online(struct ccw_device *cdev) 1201 { 1202 int ret; 1203 struct virtio_ccw_device *vcdev; 1204 unsigned long flags; 1205 1206 vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL); 1207 if (!vcdev) { 1208 dev_warn(&cdev->dev, "Could not get memory for virtio\n"); 1209 ret = -ENOMEM; 1210 goto out_free; 1211 } 1212 vcdev->config_block = kzalloc(sizeof(*vcdev->config_block), 1213 GFP_DMA | GFP_KERNEL); 1214 if (!vcdev->config_block) { 1215 ret = -ENOMEM; 1216 goto out_free; 1217 } 1218 vcdev->status = kzalloc(sizeof(*vcdev->status), GFP_DMA | GFP_KERNEL); 1219 if (!vcdev->status) { 1220 ret = -ENOMEM; 1221 goto out_free; 1222 } 1223 1224 vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */ 1225 1226 vcdev->vdev.dev.parent = &cdev->dev; 1227 vcdev->vdev.dev.release = virtio_ccw_release_dev; 1228 vcdev->vdev.config = &virtio_ccw_config_ops; 1229 vcdev->cdev = cdev; 1230 init_waitqueue_head(&vcdev->wait_q); 1231 INIT_LIST_HEAD(&vcdev->virtqueues); 1232 spin_lock_init(&vcdev->lock); 1233 1234 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1235 dev_set_drvdata(&cdev->dev, vcdev); 1236 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1237 vcdev->vdev.id.vendor = cdev->id.cu_type; 1238 vcdev->vdev.id.device = cdev->id.cu_model; 1239 1240 ret = virtio_ccw_set_transport_rev(vcdev); 1241 if (ret) 1242 goto out_free; 1243 1244 ret = register_virtio_device(&vcdev->vdev); 1245 if (ret) { 1246 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n", 1247 ret); 1248 goto out_put; 1249 } 1250 return 0; 1251 out_put: 1252 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1253 dev_set_drvdata(&cdev->dev, NULL); 1254 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1255 put_device(&vcdev->vdev.dev); 1256 return ret; 1257 out_free: 1258 if (vcdev) { 1259 kfree(vcdev->status); 1260 kfree(vcdev->config_block); 1261 } 1262 kfree(vcdev); 1263 return ret; 1264 } 1265 1266 static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event) 1267 { 1268 int rc; 1269 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1270 1271 /* 1272 * Make sure vcdev is set 1273 * i.e. set_offline/remove callback not already running 1274 */ 1275 if (!vcdev) 1276 return NOTIFY_DONE; 1277 1278 switch (event) { 1279 case CIO_GONE: 1280 vcdev->device_lost = true; 1281 rc = NOTIFY_DONE; 1282 break; 1283 default: 1284 rc = NOTIFY_DONE; 1285 break; 1286 } 1287 return rc; 1288 } 1289 1290 static struct ccw_device_id virtio_ids[] = { 1291 { CCW_DEVICE(0x3832, 0) }, 1292 {}, 1293 }; 1294 MODULE_DEVICE_TABLE(ccw, virtio_ids); 1295 1296 static struct ccw_driver virtio_ccw_driver = { 1297 .driver = { 1298 .owner = THIS_MODULE, 1299 .name = "virtio_ccw", 1300 }, 1301 .ids = virtio_ids, 1302 .probe = virtio_ccw_probe, 1303 .remove = virtio_ccw_remove, 1304 .set_offline = virtio_ccw_offline, 1305 .set_online = virtio_ccw_online, 1306 .notify = virtio_ccw_cio_notify, 1307 .int_class = IRQIO_VIR, 1308 }; 1309 1310 static int __init pure_hex(char **cp, unsigned int *val, int min_digit, 1311 int max_digit, int max_val) 1312 { 1313 int diff; 1314 1315 diff = 0; 1316 *val = 0; 1317 1318 while (diff <= max_digit) { 1319 int value = hex_to_bin(**cp); 1320 1321 if (value < 0) 1322 break; 1323 *val = *val * 16 + value; 1324 (*cp)++; 1325 diff++; 1326 } 1327 1328 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) 1329 return 1; 1330 1331 return 0; 1332 } 1333 1334 static int __init parse_busid(char *str, unsigned int *cssid, 1335 unsigned int *ssid, unsigned int *devno) 1336 { 1337 char *str_work; 1338 int rc, ret; 1339 1340 rc = 1; 1341 1342 if (*str == '\0') 1343 goto out; 1344 1345 str_work = str; 1346 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); 1347 if (ret || (str_work[0] != '.')) 1348 goto out; 1349 str_work++; 1350 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); 1351 if (ret || (str_work[0] != '.')) 1352 goto out; 1353 str_work++; 1354 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); 1355 if (ret || (str_work[0] != '\0')) 1356 goto out; 1357 1358 rc = 0; 1359 out: 1360 return rc; 1361 } 1362 1363 static void __init no_auto_parse(void) 1364 { 1365 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; 1366 char *parm, *str; 1367 int rc; 1368 1369 str = no_auto; 1370 while ((parm = strsep(&str, ","))) { 1371 rc = parse_busid(strsep(&parm, "-"), &from_cssid, 1372 &from_ssid, &from); 1373 if (rc) 1374 continue; 1375 if (parm != NULL) { 1376 rc = parse_busid(parm, &to_cssid, 1377 &to_ssid, &to); 1378 if ((from_ssid > to_ssid) || 1379 ((from_ssid == to_ssid) && (from > to))) 1380 rc = -EINVAL; 1381 } else { 1382 to_cssid = from_cssid; 1383 to_ssid = from_ssid; 1384 to = from; 1385 } 1386 if (rc) 1387 continue; 1388 while ((from_ssid < to_ssid) || 1389 ((from_ssid == to_ssid) && (from <= to))) { 1390 set_bit(from, devs_no_auto[from_ssid]); 1391 from++; 1392 if (from > __MAX_SUBCHANNEL) { 1393 from_ssid++; 1394 from = 0; 1395 } 1396 } 1397 } 1398 } 1399 1400 static int __init virtio_ccw_init(void) 1401 { 1402 /* parse no_auto string before we do anything further */ 1403 no_auto_parse(); 1404 return ccw_driver_register(&virtio_ccw_driver); 1405 } 1406 module_init(virtio_ccw_init); 1407 1408 static void __exit virtio_ccw_exit(void) 1409 { 1410 int i; 1411 1412 ccw_driver_unregister(&virtio_ccw_driver); 1413 for (i = 0; i < MAX_AIRQ_AREAS; i++) 1414 destroy_airq_info(airq_areas[i]); 1415 } 1416 module_exit(virtio_ccw_exit); 1417