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 /* payload is the address of the indicators */ 346 indicatorp = kmalloc(sizeof(&vcdev->indicators), 347 GFP_DMA | GFP_KERNEL); 348 if (!indicatorp) 349 return; 350 *indicatorp = 0; 351 ccw->cmd_code = CCW_CMD_SET_IND; 352 ccw->count = sizeof(&vcdev->indicators); 353 ccw->cda = (__u32)(unsigned long) indicatorp; 354 } 355 /* Deregister indicators from host. */ 356 vcdev->indicators = 0; 357 ccw->flags = 0; 358 ret = ccw_io_helper(vcdev, ccw, 359 vcdev->is_thinint ? 360 VIRTIO_CCW_DOING_SET_IND_ADAPTER : 361 VIRTIO_CCW_DOING_SET_IND); 362 if (ret && (ret != -ENODEV)) 363 dev_info(&vcdev->cdev->dev, 364 "Failed to deregister indicators (%d)\n", ret); 365 else if (vcdev->is_thinint) 366 virtio_ccw_drop_indicators(vcdev); 367 kfree(indicatorp); 368 kfree(thinint_area); 369 } 370 371 static inline long __do_kvm_notify(struct subchannel_id schid, 372 unsigned long queue_index, 373 long cookie) 374 { 375 register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY; 376 register struct subchannel_id __schid asm("2") = schid; 377 register unsigned long __index asm("3") = queue_index; 378 register long __rc asm("2"); 379 register long __cookie asm("4") = cookie; 380 381 asm volatile ("diag 2,4,0x500\n" 382 : "=d" (__rc) : "d" (__nr), "d" (__schid), "d" (__index), 383 "d"(__cookie) 384 : "memory", "cc"); 385 return __rc; 386 } 387 388 static inline long do_kvm_notify(struct subchannel_id schid, 389 unsigned long queue_index, 390 long cookie) 391 { 392 diag_stat_inc(DIAG_STAT_X500); 393 return __do_kvm_notify(schid, queue_index, cookie); 394 } 395 396 static bool virtio_ccw_kvm_notify(struct virtqueue *vq) 397 { 398 struct virtio_ccw_vq_info *info = vq->priv; 399 struct virtio_ccw_device *vcdev; 400 struct subchannel_id schid; 401 402 vcdev = to_vc_device(info->vq->vdev); 403 ccw_device_get_schid(vcdev->cdev, &schid); 404 info->cookie = do_kvm_notify(schid, vq->index, info->cookie); 405 if (info->cookie < 0) 406 return false; 407 return true; 408 } 409 410 static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev, 411 struct ccw1 *ccw, int index) 412 { 413 int ret; 414 415 vcdev->config_block->index = index; 416 ccw->cmd_code = CCW_CMD_READ_VQ_CONF; 417 ccw->flags = 0; 418 ccw->count = sizeof(struct vq_config_block); 419 ccw->cda = (__u32)(unsigned long)(vcdev->config_block); 420 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF); 421 if (ret) 422 return ret; 423 return vcdev->config_block->num; 424 } 425 426 static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw) 427 { 428 struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev); 429 struct virtio_ccw_vq_info *info = vq->priv; 430 unsigned long flags; 431 unsigned long size; 432 int ret; 433 unsigned int index = vq->index; 434 435 /* Remove from our list. */ 436 spin_lock_irqsave(&vcdev->lock, flags); 437 list_del(&info->node); 438 spin_unlock_irqrestore(&vcdev->lock, flags); 439 440 /* Release from host. */ 441 if (vcdev->revision == 0) { 442 info->info_block->l.queue = 0; 443 info->info_block->l.align = 0; 444 info->info_block->l.index = index; 445 info->info_block->l.num = 0; 446 ccw->count = sizeof(info->info_block->l); 447 } else { 448 info->info_block->s.desc = 0; 449 info->info_block->s.index = index; 450 info->info_block->s.num = 0; 451 info->info_block->s.avail = 0; 452 info->info_block->s.used = 0; 453 ccw->count = sizeof(info->info_block->s); 454 } 455 ccw->cmd_code = CCW_CMD_SET_VQ; 456 ccw->flags = 0; 457 ccw->cda = (__u32)(unsigned long)(info->info_block); 458 ret = ccw_io_helper(vcdev, ccw, 459 VIRTIO_CCW_DOING_SET_VQ | index); 460 /* 461 * -ENODEV isn't considered an error: The device is gone anyway. 462 * This may happen on device detach. 463 */ 464 if (ret && (ret != -ENODEV)) 465 dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d", 466 ret, index); 467 468 vring_del_virtqueue(vq); 469 size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN)); 470 free_pages_exact(info->queue, size); 471 kfree(info->info_block); 472 kfree(info); 473 } 474 475 static void virtio_ccw_del_vqs(struct virtio_device *vdev) 476 { 477 struct virtqueue *vq, *n; 478 struct ccw1 *ccw; 479 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 480 481 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 482 if (!ccw) 483 return; 484 485 virtio_ccw_drop_indicator(vcdev, ccw); 486 487 list_for_each_entry_safe(vq, n, &vdev->vqs, list) 488 virtio_ccw_del_vq(vq, ccw); 489 490 kfree(ccw); 491 } 492 493 static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev, 494 int i, vq_callback_t *callback, 495 const char *name, 496 struct ccw1 *ccw) 497 { 498 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 499 int err; 500 struct virtqueue *vq = NULL; 501 struct virtio_ccw_vq_info *info; 502 unsigned long size = 0; /* silence the compiler */ 503 unsigned long flags; 504 505 /* Allocate queue. */ 506 info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL); 507 if (!info) { 508 dev_warn(&vcdev->cdev->dev, "no info\n"); 509 err = -ENOMEM; 510 goto out_err; 511 } 512 info->info_block = kzalloc(sizeof(*info->info_block), 513 GFP_DMA | GFP_KERNEL); 514 if (!info->info_block) { 515 dev_warn(&vcdev->cdev->dev, "no info block\n"); 516 err = -ENOMEM; 517 goto out_err; 518 } 519 info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i); 520 if (info->num < 0) { 521 err = info->num; 522 goto out_err; 523 } 524 size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN)); 525 info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO); 526 if (info->queue == NULL) { 527 dev_warn(&vcdev->cdev->dev, "no queue\n"); 528 err = -ENOMEM; 529 goto out_err; 530 } 531 532 vq = vring_new_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, vdev, 533 true, info->queue, virtio_ccw_kvm_notify, 534 callback, name); 535 if (!vq) { 536 /* For now, we fail if we can't get the requested size. */ 537 dev_warn(&vcdev->cdev->dev, "no vq\n"); 538 err = -ENOMEM; 539 goto out_err; 540 } 541 542 /* Register it with the host. */ 543 if (vcdev->revision == 0) { 544 info->info_block->l.queue = (__u64)info->queue; 545 info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN; 546 info->info_block->l.index = i; 547 info->info_block->l.num = info->num; 548 ccw->count = sizeof(info->info_block->l); 549 } else { 550 info->info_block->s.desc = (__u64)info->queue; 551 info->info_block->s.index = i; 552 info->info_block->s.num = info->num; 553 info->info_block->s.avail = (__u64)virtqueue_get_avail(vq); 554 info->info_block->s.used = (__u64)virtqueue_get_used(vq); 555 ccw->count = sizeof(info->info_block->s); 556 } 557 ccw->cmd_code = CCW_CMD_SET_VQ; 558 ccw->flags = 0; 559 ccw->cda = (__u32)(unsigned long)(info->info_block); 560 err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i); 561 if (err) { 562 dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n"); 563 goto out_err; 564 } 565 566 info->vq = vq; 567 vq->priv = info; 568 569 /* Save it to our list. */ 570 spin_lock_irqsave(&vcdev->lock, flags); 571 list_add(&info->node, &vcdev->virtqueues); 572 spin_unlock_irqrestore(&vcdev->lock, flags); 573 574 return vq; 575 576 out_err: 577 if (vq) 578 vring_del_virtqueue(vq); 579 if (info) { 580 if (info->queue) 581 free_pages_exact(info->queue, size); 582 kfree(info->info_block); 583 } 584 kfree(info); 585 return ERR_PTR(err); 586 } 587 588 static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev, 589 struct virtqueue *vqs[], int nvqs, 590 struct ccw1 *ccw) 591 { 592 int ret; 593 struct virtio_thinint_area *thinint_area = NULL; 594 struct airq_info *info; 595 596 thinint_area = kzalloc(sizeof(*thinint_area), GFP_DMA | GFP_KERNEL); 597 if (!thinint_area) { 598 ret = -ENOMEM; 599 goto out; 600 } 601 /* Try to get an indicator. */ 602 thinint_area->indicator = get_airq_indicator(vqs, nvqs, 603 &thinint_area->bit_nr, 604 &vcdev->airq_info); 605 if (!thinint_area->indicator) { 606 ret = -ENOSPC; 607 goto out; 608 } 609 info = vcdev->airq_info; 610 thinint_area->summary_indicator = 611 (unsigned long) &info->summary_indicator; 612 thinint_area->isc = VIRTIO_AIRQ_ISC; 613 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; 614 ccw->flags = CCW_FLAG_SLI; 615 ccw->count = sizeof(*thinint_area); 616 ccw->cda = (__u32)(unsigned long)thinint_area; 617 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER); 618 if (ret) { 619 if (ret == -EOPNOTSUPP) { 620 /* 621 * The host does not support adapter interrupts 622 * for virtio-ccw, stop trying. 623 */ 624 virtio_ccw_use_airq = 0; 625 pr_info("Adapter interrupts unsupported on host\n"); 626 } else 627 dev_warn(&vcdev->cdev->dev, 628 "enabling adapter interrupts = %d\n", ret); 629 virtio_ccw_drop_indicators(vcdev); 630 } 631 out: 632 kfree(thinint_area); 633 return ret; 634 } 635 636 static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, 637 struct virtqueue *vqs[], 638 vq_callback_t *callbacks[], 639 const char * const names[]) 640 { 641 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 642 unsigned long *indicatorp = NULL; 643 int ret, i; 644 struct ccw1 *ccw; 645 646 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 647 if (!ccw) 648 return -ENOMEM; 649 650 for (i = 0; i < nvqs; ++i) { 651 vqs[i] = virtio_ccw_setup_vq(vdev, i, callbacks[i], names[i], 652 ccw); 653 if (IS_ERR(vqs[i])) { 654 ret = PTR_ERR(vqs[i]); 655 vqs[i] = NULL; 656 goto out; 657 } 658 } 659 ret = -ENOMEM; 660 /* 661 * We need a data area under 2G to communicate. Our payload is 662 * the address of the indicators. 663 */ 664 indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL); 665 if (!indicatorp) 666 goto out; 667 *indicatorp = (unsigned long) &vcdev->indicators; 668 if (vcdev->is_thinint) { 669 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw); 670 if (ret) 671 /* no error, just fall back to legacy interrupts */ 672 vcdev->is_thinint = 0; 673 } 674 if (!vcdev->is_thinint) { 675 /* Register queue indicators with host. */ 676 vcdev->indicators = 0; 677 ccw->cmd_code = CCW_CMD_SET_IND; 678 ccw->flags = 0; 679 ccw->count = sizeof(&vcdev->indicators); 680 ccw->cda = (__u32)(unsigned long) indicatorp; 681 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND); 682 if (ret) 683 goto out; 684 } 685 /* Register indicators2 with host for config changes */ 686 *indicatorp = (unsigned long) &vcdev->indicators2; 687 vcdev->indicators2 = 0; 688 ccw->cmd_code = CCW_CMD_SET_CONF_IND; 689 ccw->flags = 0; 690 ccw->count = sizeof(&vcdev->indicators2); 691 ccw->cda = (__u32)(unsigned long) indicatorp; 692 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND); 693 if (ret) 694 goto out; 695 696 kfree(indicatorp); 697 kfree(ccw); 698 return 0; 699 out: 700 kfree(indicatorp); 701 kfree(ccw); 702 virtio_ccw_del_vqs(vdev); 703 return ret; 704 } 705 706 static void virtio_ccw_reset(struct virtio_device *vdev) 707 { 708 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 709 struct ccw1 *ccw; 710 711 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 712 if (!ccw) 713 return; 714 715 /* Zero status bits. */ 716 *vcdev->status = 0; 717 718 /* Send a reset ccw on device. */ 719 ccw->cmd_code = CCW_CMD_VDEV_RESET; 720 ccw->flags = 0; 721 ccw->count = 0; 722 ccw->cda = 0; 723 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET); 724 kfree(ccw); 725 } 726 727 static u64 virtio_ccw_get_features(struct virtio_device *vdev) 728 { 729 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 730 struct virtio_feature_desc *features; 731 int ret; 732 u64 rc; 733 struct ccw1 *ccw; 734 735 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 736 if (!ccw) 737 return 0; 738 739 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL); 740 if (!features) { 741 rc = 0; 742 goto out_free; 743 } 744 /* Read the feature bits from the host. */ 745 features->index = 0; 746 ccw->cmd_code = CCW_CMD_READ_FEAT; 747 ccw->flags = 0; 748 ccw->count = sizeof(*features); 749 ccw->cda = (__u32)(unsigned long)features; 750 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 751 if (ret) { 752 rc = 0; 753 goto out_free; 754 } 755 756 rc = le32_to_cpu(features->features); 757 758 if (vcdev->revision == 0) 759 goto out_free; 760 761 /* Read second half of the feature bits from the host. */ 762 features->index = 1; 763 ccw->cmd_code = CCW_CMD_READ_FEAT; 764 ccw->flags = 0; 765 ccw->count = sizeof(*features); 766 ccw->cda = (__u32)(unsigned long)features; 767 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 768 if (ret == 0) 769 rc |= (u64)le32_to_cpu(features->features) << 32; 770 771 out_free: 772 kfree(features); 773 kfree(ccw); 774 return rc; 775 } 776 777 static int virtio_ccw_finalize_features(struct virtio_device *vdev) 778 { 779 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 780 struct virtio_feature_desc *features; 781 struct ccw1 *ccw; 782 int ret; 783 784 if (vcdev->revision >= 1 && 785 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { 786 dev_err(&vdev->dev, "virtio: device uses revision 1 " 787 "but does not have VIRTIO_F_VERSION_1\n"); 788 return -EINVAL; 789 } 790 791 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 792 if (!ccw) 793 return -ENOMEM; 794 795 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL); 796 if (!features) { 797 ret = -ENOMEM; 798 goto out_free; 799 } 800 /* Give virtio_ring a chance to accept features. */ 801 vring_transport_features(vdev); 802 803 features->index = 0; 804 features->features = cpu_to_le32((u32)vdev->features); 805 /* Write the first half of the feature bits to the host. */ 806 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 807 ccw->flags = 0; 808 ccw->count = sizeof(*features); 809 ccw->cda = (__u32)(unsigned long)features; 810 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 811 if (ret) 812 goto out_free; 813 814 if (vcdev->revision == 0) 815 goto out_free; 816 817 features->index = 1; 818 features->features = cpu_to_le32(vdev->features >> 32); 819 /* Write the second half of the feature bits to the host. */ 820 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 821 ccw->flags = 0; 822 ccw->count = sizeof(*features); 823 ccw->cda = (__u32)(unsigned long)features; 824 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 825 826 out_free: 827 kfree(features); 828 kfree(ccw); 829 830 return ret; 831 } 832 833 static void virtio_ccw_get_config(struct virtio_device *vdev, 834 unsigned int offset, void *buf, unsigned len) 835 { 836 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 837 int ret; 838 struct ccw1 *ccw; 839 void *config_area; 840 841 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 842 if (!ccw) 843 return; 844 845 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL); 846 if (!config_area) 847 goto out_free; 848 849 /* Read the config area from the host. */ 850 ccw->cmd_code = CCW_CMD_READ_CONF; 851 ccw->flags = 0; 852 ccw->count = offset + len; 853 ccw->cda = (__u32)(unsigned long)config_area; 854 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG); 855 if (ret) 856 goto out_free; 857 858 memcpy(vcdev->config, config_area, offset + len); 859 if (buf) 860 memcpy(buf, &vcdev->config[offset], len); 861 if (vcdev->config_ready < offset + len) 862 vcdev->config_ready = offset + len; 863 864 out_free: 865 kfree(config_area); 866 kfree(ccw); 867 } 868 869 static void virtio_ccw_set_config(struct virtio_device *vdev, 870 unsigned int offset, const void *buf, 871 unsigned len) 872 { 873 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 874 struct ccw1 *ccw; 875 void *config_area; 876 877 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 878 if (!ccw) 879 return; 880 881 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL); 882 if (!config_area) 883 goto out_free; 884 885 /* Make sure we don't overwrite fields. */ 886 if (vcdev->config_ready < offset) 887 virtio_ccw_get_config(vdev, 0, NULL, offset); 888 memcpy(&vcdev->config[offset], buf, len); 889 /* Write the config area to the host. */ 890 memcpy(config_area, vcdev->config, sizeof(vcdev->config)); 891 ccw->cmd_code = CCW_CMD_WRITE_CONF; 892 ccw->flags = 0; 893 ccw->count = offset + len; 894 ccw->cda = (__u32)(unsigned long)config_area; 895 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG); 896 897 out_free: 898 kfree(config_area); 899 kfree(ccw); 900 } 901 902 static u8 virtio_ccw_get_status(struct virtio_device *vdev) 903 { 904 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 905 906 return *vcdev->status; 907 } 908 909 static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status) 910 { 911 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 912 u8 old_status = *vcdev->status; 913 struct ccw1 *ccw; 914 int ret; 915 916 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 917 if (!ccw) 918 return; 919 920 /* Write the status to the host. */ 921 *vcdev->status = status; 922 ccw->cmd_code = CCW_CMD_WRITE_STATUS; 923 ccw->flags = 0; 924 ccw->count = sizeof(status); 925 ccw->cda = (__u32)(unsigned long)vcdev->status; 926 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS); 927 /* Write failed? We assume status is unchanged. */ 928 if (ret) 929 *vcdev->status = old_status; 930 kfree(ccw); 931 } 932 933 static struct virtio_config_ops virtio_ccw_config_ops = { 934 .get_features = virtio_ccw_get_features, 935 .finalize_features = virtio_ccw_finalize_features, 936 .get = virtio_ccw_get_config, 937 .set = virtio_ccw_set_config, 938 .get_status = virtio_ccw_get_status, 939 .set_status = virtio_ccw_set_status, 940 .reset = virtio_ccw_reset, 941 .find_vqs = virtio_ccw_find_vqs, 942 .del_vqs = virtio_ccw_del_vqs, 943 }; 944 945 946 /* 947 * ccw bus driver related functions 948 */ 949 950 static void virtio_ccw_release_dev(struct device *_d) 951 { 952 struct virtio_device *dev = dev_to_virtio(_d); 953 struct virtio_ccw_device *vcdev = to_vc_device(dev); 954 955 kfree(vcdev->status); 956 kfree(vcdev->config_block); 957 kfree(vcdev); 958 } 959 960 static int irb_is_error(struct irb *irb) 961 { 962 if (scsw_cstat(&irb->scsw) != 0) 963 return 1; 964 if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) 965 return 1; 966 if (scsw_cc(&irb->scsw) != 0) 967 return 1; 968 return 0; 969 } 970 971 static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev, 972 int index) 973 { 974 struct virtio_ccw_vq_info *info; 975 unsigned long flags; 976 struct virtqueue *vq; 977 978 vq = NULL; 979 spin_lock_irqsave(&vcdev->lock, flags); 980 list_for_each_entry(info, &vcdev->virtqueues, node) { 981 if (info->vq->index == index) { 982 vq = info->vq; 983 break; 984 } 985 } 986 spin_unlock_irqrestore(&vcdev->lock, flags); 987 return vq; 988 } 989 990 static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev, 991 __u32 activity) 992 { 993 if (vcdev->curr_io & activity) { 994 switch (activity) { 995 case VIRTIO_CCW_DOING_READ_FEAT: 996 case VIRTIO_CCW_DOING_WRITE_FEAT: 997 case VIRTIO_CCW_DOING_READ_CONFIG: 998 case VIRTIO_CCW_DOING_WRITE_CONFIG: 999 case VIRTIO_CCW_DOING_WRITE_STATUS: 1000 case VIRTIO_CCW_DOING_SET_VQ: 1001 case VIRTIO_CCW_DOING_SET_IND: 1002 case VIRTIO_CCW_DOING_SET_CONF_IND: 1003 case VIRTIO_CCW_DOING_RESET: 1004 case VIRTIO_CCW_DOING_READ_VQ_CONF: 1005 case VIRTIO_CCW_DOING_SET_IND_ADAPTER: 1006 case VIRTIO_CCW_DOING_SET_VIRTIO_REV: 1007 vcdev->curr_io &= ~activity; 1008 wake_up(&vcdev->wait_q); 1009 break; 1010 default: 1011 /* don't know what to do... */ 1012 dev_warn(&vcdev->cdev->dev, 1013 "Suspicious activity '%08x'\n", activity); 1014 WARN_ON(1); 1015 break; 1016 } 1017 } 1018 } 1019 1020 static void virtio_ccw_int_handler(struct ccw_device *cdev, 1021 unsigned long intparm, 1022 struct irb *irb) 1023 { 1024 __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK; 1025 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1026 int i; 1027 struct virtqueue *vq; 1028 1029 if (!vcdev) 1030 return; 1031 if (IS_ERR(irb)) { 1032 vcdev->err = PTR_ERR(irb); 1033 virtio_ccw_check_activity(vcdev, activity); 1034 /* Don't poke around indicators, something's wrong. */ 1035 return; 1036 } 1037 /* Check if it's a notification from the host. */ 1038 if ((intparm == 0) && 1039 (scsw_stctl(&irb->scsw) == 1040 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) { 1041 /* OK */ 1042 } 1043 if (irb_is_error(irb)) { 1044 /* Command reject? */ 1045 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) && 1046 (irb->ecw[0] & SNS0_CMD_REJECT)) 1047 vcdev->err = -EOPNOTSUPP; 1048 else 1049 /* Map everything else to -EIO. */ 1050 vcdev->err = -EIO; 1051 } 1052 virtio_ccw_check_activity(vcdev, activity); 1053 for_each_set_bit(i, &vcdev->indicators, 1054 sizeof(vcdev->indicators) * BITS_PER_BYTE) { 1055 /* The bit clear must happen before the vring kick. */ 1056 clear_bit(i, &vcdev->indicators); 1057 barrier(); 1058 vq = virtio_ccw_vq_by_ind(vcdev, i); 1059 vring_interrupt(0, vq); 1060 } 1061 if (test_bit(0, &vcdev->indicators2)) { 1062 virtio_config_changed(&vcdev->vdev); 1063 clear_bit(0, &vcdev->indicators2); 1064 } 1065 } 1066 1067 /* 1068 * We usually want to autoonline all devices, but give the admin 1069 * a way to exempt devices from this. 1070 */ 1071 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ 1072 (8*sizeof(long))) 1073 static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS]; 1074 1075 static char *no_auto = ""; 1076 1077 module_param(no_auto, charp, 0444); 1078 MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined"); 1079 1080 static int virtio_ccw_check_autoonline(struct ccw_device *cdev) 1081 { 1082 struct ccw_dev_id id; 1083 1084 ccw_device_get_id(cdev, &id); 1085 if (test_bit(id.devno, devs_no_auto[id.ssid])) 1086 return 0; 1087 return 1; 1088 } 1089 1090 static void virtio_ccw_auto_online(void *data, async_cookie_t cookie) 1091 { 1092 struct ccw_device *cdev = data; 1093 int ret; 1094 1095 ret = ccw_device_set_online(cdev); 1096 if (ret) 1097 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret); 1098 } 1099 1100 static int virtio_ccw_probe(struct ccw_device *cdev) 1101 { 1102 cdev->handler = virtio_ccw_int_handler; 1103 1104 if (virtio_ccw_check_autoonline(cdev)) 1105 async_schedule(virtio_ccw_auto_online, cdev); 1106 return 0; 1107 } 1108 1109 static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev) 1110 { 1111 unsigned long flags; 1112 struct virtio_ccw_device *vcdev; 1113 1114 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1115 vcdev = dev_get_drvdata(&cdev->dev); 1116 if (!vcdev || vcdev->going_away) { 1117 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1118 return NULL; 1119 } 1120 vcdev->going_away = true; 1121 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1122 return vcdev; 1123 } 1124 1125 static void virtio_ccw_remove(struct ccw_device *cdev) 1126 { 1127 unsigned long flags; 1128 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1129 1130 if (vcdev && cdev->online) { 1131 if (vcdev->device_lost) 1132 virtio_break_device(&vcdev->vdev); 1133 unregister_virtio_device(&vcdev->vdev); 1134 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1135 dev_set_drvdata(&cdev->dev, NULL); 1136 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1137 } 1138 cdev->handler = NULL; 1139 } 1140 1141 static int virtio_ccw_offline(struct ccw_device *cdev) 1142 { 1143 unsigned long flags; 1144 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1145 1146 if (!vcdev) 1147 return 0; 1148 if (vcdev->device_lost) 1149 virtio_break_device(&vcdev->vdev); 1150 unregister_virtio_device(&vcdev->vdev); 1151 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1152 dev_set_drvdata(&cdev->dev, NULL); 1153 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1154 return 0; 1155 } 1156 1157 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev) 1158 { 1159 struct virtio_rev_info *rev; 1160 struct ccw1 *ccw; 1161 int ret; 1162 1163 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 1164 if (!ccw) 1165 return -ENOMEM; 1166 rev = kzalloc(sizeof(*rev), GFP_DMA | GFP_KERNEL); 1167 if (!rev) { 1168 kfree(ccw); 1169 return -ENOMEM; 1170 } 1171 1172 /* Set transport revision */ 1173 ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV; 1174 ccw->flags = 0; 1175 ccw->count = sizeof(*rev); 1176 ccw->cda = (__u32)(unsigned long)rev; 1177 1178 vcdev->revision = VIRTIO_CCW_REV_MAX; 1179 do { 1180 rev->revision = vcdev->revision; 1181 /* none of our supported revisions carry payload */ 1182 rev->length = 0; 1183 ret = ccw_io_helper(vcdev, ccw, 1184 VIRTIO_CCW_DOING_SET_VIRTIO_REV); 1185 if (ret == -EOPNOTSUPP) { 1186 if (vcdev->revision == 0) 1187 /* 1188 * The host device does not support setting 1189 * the revision: let's operate it in legacy 1190 * mode. 1191 */ 1192 ret = 0; 1193 else 1194 vcdev->revision--; 1195 } 1196 } while (ret == -EOPNOTSUPP); 1197 1198 kfree(ccw); 1199 kfree(rev); 1200 return ret; 1201 } 1202 1203 static int virtio_ccw_online(struct ccw_device *cdev) 1204 { 1205 int ret; 1206 struct virtio_ccw_device *vcdev; 1207 unsigned long flags; 1208 1209 vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL); 1210 if (!vcdev) { 1211 dev_warn(&cdev->dev, "Could not get memory for virtio\n"); 1212 ret = -ENOMEM; 1213 goto out_free; 1214 } 1215 vcdev->config_block = kzalloc(sizeof(*vcdev->config_block), 1216 GFP_DMA | GFP_KERNEL); 1217 if (!vcdev->config_block) { 1218 ret = -ENOMEM; 1219 goto out_free; 1220 } 1221 vcdev->status = kzalloc(sizeof(*vcdev->status), GFP_DMA | GFP_KERNEL); 1222 if (!vcdev->status) { 1223 ret = -ENOMEM; 1224 goto out_free; 1225 } 1226 1227 vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */ 1228 1229 vcdev->vdev.dev.parent = &cdev->dev; 1230 vcdev->vdev.dev.release = virtio_ccw_release_dev; 1231 vcdev->vdev.config = &virtio_ccw_config_ops; 1232 vcdev->cdev = cdev; 1233 init_waitqueue_head(&vcdev->wait_q); 1234 INIT_LIST_HEAD(&vcdev->virtqueues); 1235 spin_lock_init(&vcdev->lock); 1236 1237 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1238 dev_set_drvdata(&cdev->dev, vcdev); 1239 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1240 vcdev->vdev.id.vendor = cdev->id.cu_type; 1241 vcdev->vdev.id.device = cdev->id.cu_model; 1242 1243 ret = virtio_ccw_set_transport_rev(vcdev); 1244 if (ret) 1245 goto out_free; 1246 1247 ret = register_virtio_device(&vcdev->vdev); 1248 if (ret) { 1249 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n", 1250 ret); 1251 goto out_put; 1252 } 1253 return 0; 1254 out_put: 1255 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1256 dev_set_drvdata(&cdev->dev, NULL); 1257 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1258 put_device(&vcdev->vdev.dev); 1259 return ret; 1260 out_free: 1261 if (vcdev) { 1262 kfree(vcdev->status); 1263 kfree(vcdev->config_block); 1264 } 1265 kfree(vcdev); 1266 return ret; 1267 } 1268 1269 static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event) 1270 { 1271 int rc; 1272 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1273 1274 /* 1275 * Make sure vcdev is set 1276 * i.e. set_offline/remove callback not already running 1277 */ 1278 if (!vcdev) 1279 return NOTIFY_DONE; 1280 1281 switch (event) { 1282 case CIO_GONE: 1283 vcdev->device_lost = true; 1284 rc = NOTIFY_DONE; 1285 break; 1286 default: 1287 rc = NOTIFY_DONE; 1288 break; 1289 } 1290 return rc; 1291 } 1292 1293 static struct ccw_device_id virtio_ids[] = { 1294 { CCW_DEVICE(0x3832, 0) }, 1295 {}, 1296 }; 1297 MODULE_DEVICE_TABLE(ccw, virtio_ids); 1298 1299 static struct ccw_driver virtio_ccw_driver = { 1300 .driver = { 1301 .owner = THIS_MODULE, 1302 .name = "virtio_ccw", 1303 }, 1304 .ids = virtio_ids, 1305 .probe = virtio_ccw_probe, 1306 .remove = virtio_ccw_remove, 1307 .set_offline = virtio_ccw_offline, 1308 .set_online = virtio_ccw_online, 1309 .notify = virtio_ccw_cio_notify, 1310 .int_class = IRQIO_VIR, 1311 }; 1312 1313 static int __init pure_hex(char **cp, unsigned int *val, int min_digit, 1314 int max_digit, int max_val) 1315 { 1316 int diff; 1317 1318 diff = 0; 1319 *val = 0; 1320 1321 while (diff <= max_digit) { 1322 int value = hex_to_bin(**cp); 1323 1324 if (value < 0) 1325 break; 1326 *val = *val * 16 + value; 1327 (*cp)++; 1328 diff++; 1329 } 1330 1331 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) 1332 return 1; 1333 1334 return 0; 1335 } 1336 1337 static int __init parse_busid(char *str, unsigned int *cssid, 1338 unsigned int *ssid, unsigned int *devno) 1339 { 1340 char *str_work; 1341 int rc, ret; 1342 1343 rc = 1; 1344 1345 if (*str == '\0') 1346 goto out; 1347 1348 str_work = str; 1349 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); 1350 if (ret || (str_work[0] != '.')) 1351 goto out; 1352 str_work++; 1353 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); 1354 if (ret || (str_work[0] != '.')) 1355 goto out; 1356 str_work++; 1357 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); 1358 if (ret || (str_work[0] != '\0')) 1359 goto out; 1360 1361 rc = 0; 1362 out: 1363 return rc; 1364 } 1365 1366 static void __init no_auto_parse(void) 1367 { 1368 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; 1369 char *parm, *str; 1370 int rc; 1371 1372 str = no_auto; 1373 while ((parm = strsep(&str, ","))) { 1374 rc = parse_busid(strsep(&parm, "-"), &from_cssid, 1375 &from_ssid, &from); 1376 if (rc) 1377 continue; 1378 if (parm != NULL) { 1379 rc = parse_busid(parm, &to_cssid, 1380 &to_ssid, &to); 1381 if ((from_ssid > to_ssid) || 1382 ((from_ssid == to_ssid) && (from > to))) 1383 rc = -EINVAL; 1384 } else { 1385 to_cssid = from_cssid; 1386 to_ssid = from_ssid; 1387 to = from; 1388 } 1389 if (rc) 1390 continue; 1391 while ((from_ssid < to_ssid) || 1392 ((from_ssid == to_ssid) && (from <= to))) { 1393 set_bit(from, devs_no_auto[from_ssid]); 1394 from++; 1395 if (from > __MAX_SUBCHANNEL) { 1396 from_ssid++; 1397 from = 0; 1398 } 1399 } 1400 } 1401 } 1402 1403 static int __init virtio_ccw_init(void) 1404 { 1405 /* parse no_auto string before we do anything further */ 1406 no_auto_parse(); 1407 return ccw_driver_register(&virtio_ccw_driver); 1408 } 1409 module_init(virtio_ccw_init); 1410 1411 static void __exit virtio_ccw_exit(void) 1412 { 1413 int i; 1414 1415 ccw_driver_unregister(&virtio_ccw_driver); 1416 for (i = 0; i < MAX_AIRQ_AREAS; i++) 1417 destroy_airq_info(airq_areas[i]); 1418 } 1419 module_exit(virtio_ccw_exit); 1420