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); 1396