1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ccw based virtio transport 4 * 5 * Copyright IBM Corp. 2012, 2014 6 * 7 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> 8 */ 9 10 #include <linux/kernel_stat.h> 11 #include <linux/init.h> 12 #include <linux/memblock.h> 13 #include <linux/err.h> 14 #include <linux/virtio.h> 15 #include <linux/virtio_config.h> 16 #include <linux/slab.h> 17 #include <linux/interrupt.h> 18 #include <linux/virtio_ring.h> 19 #include <linux/pfn.h> 20 #include <linux/async.h> 21 #include <linux/wait.h> 22 #include <linux/list.h> 23 #include <linux/bitops.h> 24 #include <linux/moduleparam.h> 25 #include <linux/io.h> 26 #include <linux/kvm_para.h> 27 #include <linux/notifier.h> 28 #include <asm/diag.h> 29 #include <asm/setup.h> 30 #include <asm/irq.h> 31 #include <asm/cio.h> 32 #include <asm/ccwdev.h> 33 #include <asm/virtio-ccw.h> 34 #include <asm/isc.h> 35 #include <asm/airq.h> 36 37 /* 38 * virtio related functions 39 */ 40 41 struct vq_config_block { 42 __u16 index; 43 __u16 num; 44 } __packed; 45 46 #define VIRTIO_CCW_CONFIG_SIZE 0x100 47 /* same as PCI config space size, should be enough for all drivers */ 48 49 struct virtio_ccw_device { 50 struct virtio_device vdev; 51 __u8 *status; 52 __u8 config[VIRTIO_CCW_CONFIG_SIZE]; 53 struct ccw_device *cdev; 54 __u32 curr_io; 55 int err; 56 unsigned int revision; /* Transport revision */ 57 wait_queue_head_t wait_q; 58 spinlock_t lock; 59 struct mutex io_lock; /* Serializes I/O requests */ 60 struct list_head virtqueues; 61 unsigned long indicators; 62 unsigned long indicators2; 63 struct vq_config_block *config_block; 64 bool is_thinint; 65 bool going_away; 66 bool device_lost; 67 unsigned int config_ready; 68 void *airq_info; 69 }; 70 71 struct vq_info_block_legacy { 72 __u64 queue; 73 __u32 align; 74 __u16 index; 75 __u16 num; 76 } __packed; 77 78 struct vq_info_block { 79 __u64 desc; 80 __u32 res0; 81 __u16 index; 82 __u16 num; 83 __u64 avail; 84 __u64 used; 85 } __packed; 86 87 struct virtio_feature_desc { 88 __le32 features; 89 __u8 index; 90 } __packed; 91 92 struct virtio_thinint_area { 93 unsigned long summary_indicator; 94 unsigned long indicator; 95 u64 bit_nr; 96 u8 isc; 97 } __packed; 98 99 struct virtio_rev_info { 100 __u16 revision; 101 __u16 length; 102 __u8 data[]; 103 }; 104 105 /* the highest virtio-ccw revision we support */ 106 #define VIRTIO_CCW_REV_MAX 1 107 108 struct virtio_ccw_vq_info { 109 struct virtqueue *vq; 110 int num; 111 void *queue; 112 union { 113 struct vq_info_block s; 114 struct vq_info_block_legacy l; 115 } *info_block; 116 int bit_nr; 117 struct list_head node; 118 long cookie; 119 }; 120 121 #define VIRTIO_AIRQ_ISC IO_SCH_ISC /* inherit from subchannel */ 122 123 #define VIRTIO_IV_BITS (L1_CACHE_BYTES * 8) 124 #define MAX_AIRQ_AREAS 20 125 126 static int virtio_ccw_use_airq = 1; 127 128 struct airq_info { 129 rwlock_t lock; 130 u8 summary_indicator; 131 struct airq_struct airq; 132 struct airq_iv *aiv; 133 }; 134 static struct airq_info *airq_areas[MAX_AIRQ_AREAS]; 135 136 #define CCW_CMD_SET_VQ 0x13 137 #define CCW_CMD_VDEV_RESET 0x33 138 #define CCW_CMD_SET_IND 0x43 139 #define CCW_CMD_SET_CONF_IND 0x53 140 #define CCW_CMD_READ_FEAT 0x12 141 #define CCW_CMD_WRITE_FEAT 0x11 142 #define CCW_CMD_READ_CONF 0x22 143 #define CCW_CMD_WRITE_CONF 0x21 144 #define CCW_CMD_WRITE_STATUS 0x31 145 #define CCW_CMD_READ_VQ_CONF 0x32 146 #define CCW_CMD_READ_STATUS 0x72 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_DOING_READ_STATUS 0x20000000 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 unsigned long get_airq_indicator(struct virtqueue *vqs[], int nvqs, 239 u64 *first, void **airq_info) 240 { 241 int i, j; 242 struct airq_info *info; 243 unsigned long indicator_addr = 0; 244 unsigned long bit, flags; 245 246 for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) { 247 if (!airq_areas[i]) 248 airq_areas[i] = new_airq_info(); 249 info = airq_areas[i]; 250 if (!info) 251 return 0; 252 write_lock_irqsave(&info->lock, flags); 253 bit = airq_iv_alloc(info->aiv, nvqs); 254 if (bit == -1UL) { 255 /* Not enough vacancies. */ 256 write_unlock_irqrestore(&info->lock, flags); 257 continue; 258 } 259 *first = bit; 260 *airq_info = info; 261 indicator_addr = (unsigned long)info->aiv->vector; 262 for (j = 0; j < nvqs; j++) { 263 airq_iv_set_ptr(info->aiv, bit + j, 264 (unsigned long)vqs[j]); 265 } 266 write_unlock_irqrestore(&info->lock, flags); 267 } 268 return indicator_addr; 269 } 270 271 static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev) 272 { 273 struct virtio_ccw_vq_info *info; 274 275 list_for_each_entry(info, &vcdev->virtqueues, node) 276 drop_airq_indicator(info->vq, vcdev->airq_info); 277 } 278 279 static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag) 280 { 281 unsigned long flags; 282 __u32 ret; 283 284 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); 285 if (vcdev->err) 286 ret = 0; 287 else 288 ret = vcdev->curr_io & flag; 289 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); 290 return ret; 291 } 292 293 static int ccw_io_helper(struct virtio_ccw_device *vcdev, 294 struct ccw1 *ccw, __u32 intparm) 295 { 296 int ret; 297 unsigned long flags; 298 int flag = intparm & VIRTIO_CCW_INTPARM_MASK; 299 300 mutex_lock(&vcdev->io_lock); 301 do { 302 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); 303 ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0); 304 if (!ret) { 305 if (!vcdev->curr_io) 306 vcdev->err = 0; 307 vcdev->curr_io |= flag; 308 } 309 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); 310 cpu_relax(); 311 } while (ret == -EBUSY); 312 wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0); 313 ret = ret ? ret : vcdev->err; 314 mutex_unlock(&vcdev->io_lock); 315 return ret; 316 } 317 318 static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev, 319 struct ccw1 *ccw) 320 { 321 int ret; 322 unsigned long *indicatorp = NULL; 323 struct virtio_thinint_area *thinint_area = NULL; 324 struct airq_info *airq_info = vcdev->airq_info; 325 326 if (vcdev->is_thinint) { 327 thinint_area = kzalloc(sizeof(*thinint_area), 328 GFP_DMA | GFP_KERNEL); 329 if (!thinint_area) 330 return; 331 thinint_area->summary_indicator = 332 (unsigned long) &airq_info->summary_indicator; 333 thinint_area->isc = VIRTIO_AIRQ_ISC; 334 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; 335 ccw->count = sizeof(*thinint_area); 336 ccw->cda = (__u32)(unsigned long) thinint_area; 337 } else { 338 /* payload is the address of the indicators */ 339 indicatorp = kmalloc(sizeof(&vcdev->indicators), 340 GFP_DMA | GFP_KERNEL); 341 if (!indicatorp) 342 return; 343 *indicatorp = 0; 344 ccw->cmd_code = CCW_CMD_SET_IND; 345 ccw->count = sizeof(&vcdev->indicators); 346 ccw->cda = (__u32)(unsigned long) indicatorp; 347 } 348 /* Deregister indicators from host. */ 349 vcdev->indicators = 0; 350 ccw->flags = 0; 351 ret = ccw_io_helper(vcdev, ccw, 352 vcdev->is_thinint ? 353 VIRTIO_CCW_DOING_SET_IND_ADAPTER : 354 VIRTIO_CCW_DOING_SET_IND); 355 if (ret && (ret != -ENODEV)) 356 dev_info(&vcdev->cdev->dev, 357 "Failed to deregister indicators (%d)\n", ret); 358 else if (vcdev->is_thinint) 359 virtio_ccw_drop_indicators(vcdev); 360 kfree(indicatorp); 361 kfree(thinint_area); 362 } 363 364 static inline long __do_kvm_notify(struct subchannel_id schid, 365 unsigned long queue_index, 366 long cookie) 367 { 368 register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY; 369 register struct subchannel_id __schid asm("2") = schid; 370 register unsigned long __index asm("3") = queue_index; 371 register long __rc asm("2"); 372 register long __cookie asm("4") = cookie; 373 374 asm volatile ("diag 2,4,0x500\n" 375 : "=d" (__rc) : "d" (__nr), "d" (__schid), "d" (__index), 376 "d"(__cookie) 377 : "memory", "cc"); 378 return __rc; 379 } 380 381 static inline long do_kvm_notify(struct subchannel_id schid, 382 unsigned long queue_index, 383 long cookie) 384 { 385 diag_stat_inc(DIAG_STAT_X500); 386 return __do_kvm_notify(schid, queue_index, cookie); 387 } 388 389 static bool virtio_ccw_kvm_notify(struct virtqueue *vq) 390 { 391 struct virtio_ccw_vq_info *info = vq->priv; 392 struct virtio_ccw_device *vcdev; 393 struct subchannel_id schid; 394 395 vcdev = to_vc_device(info->vq->vdev); 396 ccw_device_get_schid(vcdev->cdev, &schid); 397 info->cookie = do_kvm_notify(schid, vq->index, info->cookie); 398 if (info->cookie < 0) 399 return false; 400 return true; 401 } 402 403 static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev, 404 struct ccw1 *ccw, int index) 405 { 406 int ret; 407 408 vcdev->config_block->index = index; 409 ccw->cmd_code = CCW_CMD_READ_VQ_CONF; 410 ccw->flags = 0; 411 ccw->count = sizeof(struct vq_config_block); 412 ccw->cda = (__u32)(unsigned long)(vcdev->config_block); 413 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF); 414 if (ret) 415 return ret; 416 return vcdev->config_block->num; 417 } 418 419 static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw) 420 { 421 struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev); 422 struct virtio_ccw_vq_info *info = vq->priv; 423 unsigned long flags; 424 unsigned long size; 425 int ret; 426 unsigned int index = vq->index; 427 428 /* Remove from our list. */ 429 spin_lock_irqsave(&vcdev->lock, flags); 430 list_del(&info->node); 431 spin_unlock_irqrestore(&vcdev->lock, flags); 432 433 /* Release from host. */ 434 if (vcdev->revision == 0) { 435 info->info_block->l.queue = 0; 436 info->info_block->l.align = 0; 437 info->info_block->l.index = index; 438 info->info_block->l.num = 0; 439 ccw->count = sizeof(info->info_block->l); 440 } else { 441 info->info_block->s.desc = 0; 442 info->info_block->s.index = index; 443 info->info_block->s.num = 0; 444 info->info_block->s.avail = 0; 445 info->info_block->s.used = 0; 446 ccw->count = sizeof(info->info_block->s); 447 } 448 ccw->cmd_code = CCW_CMD_SET_VQ; 449 ccw->flags = 0; 450 ccw->cda = (__u32)(unsigned long)(info->info_block); 451 ret = ccw_io_helper(vcdev, ccw, 452 VIRTIO_CCW_DOING_SET_VQ | index); 453 /* 454 * -ENODEV isn't considered an error: The device is gone anyway. 455 * This may happen on device detach. 456 */ 457 if (ret && (ret != -ENODEV)) 458 dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d\n", 459 ret, index); 460 461 vring_del_virtqueue(vq); 462 size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN)); 463 free_pages_exact(info->queue, size); 464 kfree(info->info_block); 465 kfree(info); 466 } 467 468 static void virtio_ccw_del_vqs(struct virtio_device *vdev) 469 { 470 struct virtqueue *vq, *n; 471 struct ccw1 *ccw; 472 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 473 474 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 475 if (!ccw) 476 return; 477 478 virtio_ccw_drop_indicator(vcdev, ccw); 479 480 list_for_each_entry_safe(vq, n, &vdev->vqs, list) 481 virtio_ccw_del_vq(vq, ccw); 482 483 kfree(ccw); 484 } 485 486 static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev, 487 int i, vq_callback_t *callback, 488 const char *name, bool ctx, 489 struct ccw1 *ccw) 490 { 491 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 492 int err; 493 struct virtqueue *vq = NULL; 494 struct virtio_ccw_vq_info *info; 495 unsigned long size = 0; /* silence the compiler */ 496 unsigned long flags; 497 498 /* Allocate queue. */ 499 info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL); 500 if (!info) { 501 dev_warn(&vcdev->cdev->dev, "no info\n"); 502 err = -ENOMEM; 503 goto out_err; 504 } 505 info->info_block = kzalloc(sizeof(*info->info_block), 506 GFP_DMA | GFP_KERNEL); 507 if (!info->info_block) { 508 dev_warn(&vcdev->cdev->dev, "no info block\n"); 509 err = -ENOMEM; 510 goto out_err; 511 } 512 info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i); 513 if (info->num < 0) { 514 err = info->num; 515 goto out_err; 516 } 517 size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN)); 518 info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO); 519 if (info->queue == NULL) { 520 dev_warn(&vcdev->cdev->dev, "no queue\n"); 521 err = -ENOMEM; 522 goto out_err; 523 } 524 525 vq = vring_new_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, vdev, 526 true, ctx, info->queue, virtio_ccw_kvm_notify, 527 callback, name); 528 if (!vq) { 529 /* For now, we fail if we can't get the requested size. */ 530 dev_warn(&vcdev->cdev->dev, "no vq\n"); 531 err = -ENOMEM; 532 goto out_err; 533 } 534 535 /* Register it with the host. */ 536 if (vcdev->revision == 0) { 537 info->info_block->l.queue = (__u64)info->queue; 538 info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN; 539 info->info_block->l.index = i; 540 info->info_block->l.num = info->num; 541 ccw->count = sizeof(info->info_block->l); 542 } else { 543 info->info_block->s.desc = (__u64)info->queue; 544 info->info_block->s.index = i; 545 info->info_block->s.num = info->num; 546 info->info_block->s.avail = (__u64)virtqueue_get_avail(vq); 547 info->info_block->s.used = (__u64)virtqueue_get_used(vq); 548 ccw->count = sizeof(info->info_block->s); 549 } 550 ccw->cmd_code = CCW_CMD_SET_VQ; 551 ccw->flags = 0; 552 ccw->cda = (__u32)(unsigned long)(info->info_block); 553 err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i); 554 if (err) { 555 dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n"); 556 goto out_err; 557 } 558 559 info->vq = vq; 560 vq->priv = info; 561 562 /* Save it to our list. */ 563 spin_lock_irqsave(&vcdev->lock, flags); 564 list_add(&info->node, &vcdev->virtqueues); 565 spin_unlock_irqrestore(&vcdev->lock, flags); 566 567 return vq; 568 569 out_err: 570 if (vq) 571 vring_del_virtqueue(vq); 572 if (info) { 573 if (info->queue) 574 free_pages_exact(info->queue, size); 575 kfree(info->info_block); 576 } 577 kfree(info); 578 return ERR_PTR(err); 579 } 580 581 static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev, 582 struct virtqueue *vqs[], int nvqs, 583 struct ccw1 *ccw) 584 { 585 int ret; 586 struct virtio_thinint_area *thinint_area = NULL; 587 struct airq_info *info; 588 589 thinint_area = kzalloc(sizeof(*thinint_area), GFP_DMA | GFP_KERNEL); 590 if (!thinint_area) { 591 ret = -ENOMEM; 592 goto out; 593 } 594 /* Try to get an indicator. */ 595 thinint_area->indicator = get_airq_indicator(vqs, nvqs, 596 &thinint_area->bit_nr, 597 &vcdev->airq_info); 598 if (!thinint_area->indicator) { 599 ret = -ENOSPC; 600 goto out; 601 } 602 info = vcdev->airq_info; 603 thinint_area->summary_indicator = 604 (unsigned long) &info->summary_indicator; 605 thinint_area->isc = VIRTIO_AIRQ_ISC; 606 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; 607 ccw->flags = CCW_FLAG_SLI; 608 ccw->count = sizeof(*thinint_area); 609 ccw->cda = (__u32)(unsigned long)thinint_area; 610 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER); 611 if (ret) { 612 if (ret == -EOPNOTSUPP) { 613 /* 614 * The host does not support adapter interrupts 615 * for virtio-ccw, stop trying. 616 */ 617 virtio_ccw_use_airq = 0; 618 pr_info("Adapter interrupts unsupported on host\n"); 619 } else 620 dev_warn(&vcdev->cdev->dev, 621 "enabling adapter interrupts = %d\n", ret); 622 virtio_ccw_drop_indicators(vcdev); 623 } 624 out: 625 kfree(thinint_area); 626 return ret; 627 } 628 629 static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, 630 struct virtqueue *vqs[], 631 vq_callback_t *callbacks[], 632 const char * const names[], 633 const bool *ctx, 634 struct irq_affinity *desc) 635 { 636 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 637 unsigned long *indicatorp = NULL; 638 int ret, i; 639 struct ccw1 *ccw; 640 641 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 642 if (!ccw) 643 return -ENOMEM; 644 645 for (i = 0; i < nvqs; ++i) { 646 vqs[i] = virtio_ccw_setup_vq(vdev, i, callbacks[i], names[i], 647 ctx ? ctx[i] : false, ccw); 648 if (IS_ERR(vqs[i])) { 649 ret = PTR_ERR(vqs[i]); 650 vqs[i] = NULL; 651 goto out; 652 } 653 } 654 ret = -ENOMEM; 655 /* 656 * We need a data area under 2G to communicate. Our payload is 657 * the address of the indicators. 658 */ 659 indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL); 660 if (!indicatorp) 661 goto out; 662 *indicatorp = (unsigned long) &vcdev->indicators; 663 if (vcdev->is_thinint) { 664 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw); 665 if (ret) 666 /* no error, just fall back to legacy interrupts */ 667 vcdev->is_thinint = false; 668 } 669 if (!vcdev->is_thinint) { 670 /* Register queue indicators with host. */ 671 vcdev->indicators = 0; 672 ccw->cmd_code = CCW_CMD_SET_IND; 673 ccw->flags = 0; 674 ccw->count = sizeof(&vcdev->indicators); 675 ccw->cda = (__u32)(unsigned long) indicatorp; 676 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND); 677 if (ret) 678 goto out; 679 } 680 /* Register indicators2 with host for config changes */ 681 *indicatorp = (unsigned long) &vcdev->indicators2; 682 vcdev->indicators2 = 0; 683 ccw->cmd_code = CCW_CMD_SET_CONF_IND; 684 ccw->flags = 0; 685 ccw->count = sizeof(&vcdev->indicators2); 686 ccw->cda = (__u32)(unsigned long) indicatorp; 687 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND); 688 if (ret) 689 goto out; 690 691 kfree(indicatorp); 692 kfree(ccw); 693 return 0; 694 out: 695 kfree(indicatorp); 696 kfree(ccw); 697 virtio_ccw_del_vqs(vdev); 698 return ret; 699 } 700 701 static void virtio_ccw_reset(struct virtio_device *vdev) 702 { 703 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 704 struct ccw1 *ccw; 705 706 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 707 if (!ccw) 708 return; 709 710 /* Zero status bits. */ 711 *vcdev->status = 0; 712 713 /* Send a reset ccw on device. */ 714 ccw->cmd_code = CCW_CMD_VDEV_RESET; 715 ccw->flags = 0; 716 ccw->count = 0; 717 ccw->cda = 0; 718 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET); 719 kfree(ccw); 720 } 721 722 static u64 virtio_ccw_get_features(struct virtio_device *vdev) 723 { 724 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 725 struct virtio_feature_desc *features; 726 int ret; 727 u64 rc; 728 struct ccw1 *ccw; 729 730 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 731 if (!ccw) 732 return 0; 733 734 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL); 735 if (!features) { 736 rc = 0; 737 goto out_free; 738 } 739 /* Read the feature bits from the host. */ 740 features->index = 0; 741 ccw->cmd_code = CCW_CMD_READ_FEAT; 742 ccw->flags = 0; 743 ccw->count = sizeof(*features); 744 ccw->cda = (__u32)(unsigned long)features; 745 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 746 if (ret) { 747 rc = 0; 748 goto out_free; 749 } 750 751 rc = le32_to_cpu(features->features); 752 753 if (vcdev->revision == 0) 754 goto out_free; 755 756 /* Read second half of the feature bits from the host. */ 757 features->index = 1; 758 ccw->cmd_code = CCW_CMD_READ_FEAT; 759 ccw->flags = 0; 760 ccw->count = sizeof(*features); 761 ccw->cda = (__u32)(unsigned long)features; 762 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 763 if (ret == 0) 764 rc |= (u64)le32_to_cpu(features->features) << 32; 765 766 out_free: 767 kfree(features); 768 kfree(ccw); 769 return rc; 770 } 771 772 static void ccw_transport_features(struct virtio_device *vdev) 773 { 774 /* 775 * Packed ring isn't enabled on virtio_ccw for now, 776 * because virtio_ccw uses some legacy accessors, 777 * e.g. virtqueue_get_avail() and virtqueue_get_used() 778 * which aren't available in packed ring currently. 779 */ 780 __virtio_clear_bit(vdev, VIRTIO_F_RING_PACKED); 781 } 782 783 static int virtio_ccw_finalize_features(struct virtio_device *vdev) 784 { 785 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 786 struct virtio_feature_desc *features; 787 struct ccw1 *ccw; 788 int ret; 789 790 if (vcdev->revision >= 1 && 791 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { 792 dev_err(&vdev->dev, "virtio: device uses revision 1 " 793 "but does not have VIRTIO_F_VERSION_1\n"); 794 return -EINVAL; 795 } 796 797 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 798 if (!ccw) 799 return -ENOMEM; 800 801 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL); 802 if (!features) { 803 ret = -ENOMEM; 804 goto out_free; 805 } 806 /* Give virtio_ring a chance to accept features. */ 807 vring_transport_features(vdev); 808 809 /* Give virtio_ccw a chance to accept features. */ 810 ccw_transport_features(vdev); 811 812 features->index = 0; 813 features->features = cpu_to_le32((u32)vdev->features); 814 /* Write the first half of the feature bits to the host. */ 815 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 816 ccw->flags = 0; 817 ccw->count = sizeof(*features); 818 ccw->cda = (__u32)(unsigned long)features; 819 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 820 if (ret) 821 goto out_free; 822 823 if (vcdev->revision == 0) 824 goto out_free; 825 826 features->index = 1; 827 features->features = cpu_to_le32(vdev->features >> 32); 828 /* Write the second half of the feature bits to the host. */ 829 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 830 ccw->flags = 0; 831 ccw->count = sizeof(*features); 832 ccw->cda = (__u32)(unsigned long)features; 833 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 834 835 out_free: 836 kfree(features); 837 kfree(ccw); 838 839 return ret; 840 } 841 842 static void virtio_ccw_get_config(struct virtio_device *vdev, 843 unsigned int offset, void *buf, unsigned len) 844 { 845 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 846 int ret; 847 struct ccw1 *ccw; 848 void *config_area; 849 unsigned long flags; 850 851 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 852 if (!ccw) 853 return; 854 855 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL); 856 if (!config_area) 857 goto out_free; 858 859 /* Read the config area from the host. */ 860 ccw->cmd_code = CCW_CMD_READ_CONF; 861 ccw->flags = 0; 862 ccw->count = offset + len; 863 ccw->cda = (__u32)(unsigned long)config_area; 864 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG); 865 if (ret) 866 goto out_free; 867 868 spin_lock_irqsave(&vcdev->lock, flags); 869 memcpy(vcdev->config, config_area, offset + len); 870 if (vcdev->config_ready < offset + len) 871 vcdev->config_ready = offset + len; 872 spin_unlock_irqrestore(&vcdev->lock, flags); 873 if (buf) 874 memcpy(buf, config_area + offset, len); 875 876 out_free: 877 kfree(config_area); 878 kfree(ccw); 879 } 880 881 static void virtio_ccw_set_config(struct virtio_device *vdev, 882 unsigned int offset, const void *buf, 883 unsigned len) 884 { 885 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 886 struct ccw1 *ccw; 887 void *config_area; 888 unsigned long flags; 889 890 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 891 if (!ccw) 892 return; 893 894 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL); 895 if (!config_area) 896 goto out_free; 897 898 /* Make sure we don't overwrite fields. */ 899 if (vcdev->config_ready < offset) 900 virtio_ccw_get_config(vdev, 0, NULL, offset); 901 spin_lock_irqsave(&vcdev->lock, flags); 902 memcpy(&vcdev->config[offset], buf, len); 903 /* Write the config area to the host. */ 904 memcpy(config_area, vcdev->config, sizeof(vcdev->config)); 905 spin_unlock_irqrestore(&vcdev->lock, flags); 906 ccw->cmd_code = CCW_CMD_WRITE_CONF; 907 ccw->flags = 0; 908 ccw->count = offset + len; 909 ccw->cda = (__u32)(unsigned long)config_area; 910 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG); 911 912 out_free: 913 kfree(config_area); 914 kfree(ccw); 915 } 916 917 static u8 virtio_ccw_get_status(struct virtio_device *vdev) 918 { 919 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 920 u8 old_status = *vcdev->status; 921 struct ccw1 *ccw; 922 923 if (vcdev->revision < 1) 924 return *vcdev->status; 925 926 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 927 if (!ccw) 928 return old_status; 929 930 ccw->cmd_code = CCW_CMD_READ_STATUS; 931 ccw->flags = 0; 932 ccw->count = sizeof(*vcdev->status); 933 ccw->cda = (__u32)(unsigned long)vcdev->status; 934 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS); 935 /* 936 * If the channel program failed (should only happen if the device 937 * was hotunplugged, and then we clean up via the machine check 938 * handler anyway), vcdev->status was not overwritten and we just 939 * return the old status, which is fine. 940 */ 941 kfree(ccw); 942 943 return *vcdev->status; 944 } 945 946 static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status) 947 { 948 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 949 u8 old_status = *vcdev->status; 950 struct ccw1 *ccw; 951 int ret; 952 953 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 954 if (!ccw) 955 return; 956 957 /* Write the status to the host. */ 958 *vcdev->status = status; 959 ccw->cmd_code = CCW_CMD_WRITE_STATUS; 960 ccw->flags = 0; 961 ccw->count = sizeof(status); 962 ccw->cda = (__u32)(unsigned long)vcdev->status; 963 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS); 964 /* Write failed? We assume status is unchanged. */ 965 if (ret) 966 *vcdev->status = old_status; 967 kfree(ccw); 968 } 969 970 static const struct virtio_config_ops virtio_ccw_config_ops = { 971 .get_features = virtio_ccw_get_features, 972 .finalize_features = virtio_ccw_finalize_features, 973 .get = virtio_ccw_get_config, 974 .set = virtio_ccw_set_config, 975 .get_status = virtio_ccw_get_status, 976 .set_status = virtio_ccw_set_status, 977 .reset = virtio_ccw_reset, 978 .find_vqs = virtio_ccw_find_vqs, 979 .del_vqs = virtio_ccw_del_vqs, 980 }; 981 982 983 /* 984 * ccw bus driver related functions 985 */ 986 987 static void virtio_ccw_release_dev(struct device *_d) 988 { 989 struct virtio_device *dev = dev_to_virtio(_d); 990 struct virtio_ccw_device *vcdev = to_vc_device(dev); 991 992 kfree(vcdev->status); 993 kfree(vcdev->config_block); 994 kfree(vcdev); 995 } 996 997 static int irb_is_error(struct irb *irb) 998 { 999 if (scsw_cstat(&irb->scsw) != 0) 1000 return 1; 1001 if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) 1002 return 1; 1003 if (scsw_cc(&irb->scsw) != 0) 1004 return 1; 1005 return 0; 1006 } 1007 1008 static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev, 1009 int index) 1010 { 1011 struct virtio_ccw_vq_info *info; 1012 unsigned long flags; 1013 struct virtqueue *vq; 1014 1015 vq = NULL; 1016 spin_lock_irqsave(&vcdev->lock, flags); 1017 list_for_each_entry(info, &vcdev->virtqueues, node) { 1018 if (info->vq->index == index) { 1019 vq = info->vq; 1020 break; 1021 } 1022 } 1023 spin_unlock_irqrestore(&vcdev->lock, flags); 1024 return vq; 1025 } 1026 1027 static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev, 1028 __u32 activity) 1029 { 1030 if (vcdev->curr_io & activity) { 1031 switch (activity) { 1032 case VIRTIO_CCW_DOING_READ_FEAT: 1033 case VIRTIO_CCW_DOING_WRITE_FEAT: 1034 case VIRTIO_CCW_DOING_READ_CONFIG: 1035 case VIRTIO_CCW_DOING_WRITE_CONFIG: 1036 case VIRTIO_CCW_DOING_WRITE_STATUS: 1037 case VIRTIO_CCW_DOING_READ_STATUS: 1038 case VIRTIO_CCW_DOING_SET_VQ: 1039 case VIRTIO_CCW_DOING_SET_IND: 1040 case VIRTIO_CCW_DOING_SET_CONF_IND: 1041 case VIRTIO_CCW_DOING_RESET: 1042 case VIRTIO_CCW_DOING_READ_VQ_CONF: 1043 case VIRTIO_CCW_DOING_SET_IND_ADAPTER: 1044 case VIRTIO_CCW_DOING_SET_VIRTIO_REV: 1045 vcdev->curr_io &= ~activity; 1046 wake_up(&vcdev->wait_q); 1047 break; 1048 default: 1049 /* don't know what to do... */ 1050 dev_warn(&vcdev->cdev->dev, 1051 "Suspicious activity '%08x'\n", activity); 1052 WARN_ON(1); 1053 break; 1054 } 1055 } 1056 } 1057 1058 static void virtio_ccw_int_handler(struct ccw_device *cdev, 1059 unsigned long intparm, 1060 struct irb *irb) 1061 { 1062 __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK; 1063 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1064 int i; 1065 struct virtqueue *vq; 1066 1067 if (!vcdev) 1068 return; 1069 if (IS_ERR(irb)) { 1070 vcdev->err = PTR_ERR(irb); 1071 virtio_ccw_check_activity(vcdev, activity); 1072 /* Don't poke around indicators, something's wrong. */ 1073 return; 1074 } 1075 /* Check if it's a notification from the host. */ 1076 if ((intparm == 0) && 1077 (scsw_stctl(&irb->scsw) == 1078 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) { 1079 /* OK */ 1080 } 1081 if (irb_is_error(irb)) { 1082 /* Command reject? */ 1083 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) && 1084 (irb->ecw[0] & SNS0_CMD_REJECT)) 1085 vcdev->err = -EOPNOTSUPP; 1086 else 1087 /* Map everything else to -EIO. */ 1088 vcdev->err = -EIO; 1089 } 1090 virtio_ccw_check_activity(vcdev, activity); 1091 for_each_set_bit(i, &vcdev->indicators, 1092 sizeof(vcdev->indicators) * BITS_PER_BYTE) { 1093 /* The bit clear must happen before the vring kick. */ 1094 clear_bit(i, &vcdev->indicators); 1095 barrier(); 1096 vq = virtio_ccw_vq_by_ind(vcdev, i); 1097 vring_interrupt(0, vq); 1098 } 1099 if (test_bit(0, &vcdev->indicators2)) { 1100 virtio_config_changed(&vcdev->vdev); 1101 clear_bit(0, &vcdev->indicators2); 1102 } 1103 } 1104 1105 /* 1106 * We usually want to autoonline all devices, but give the admin 1107 * a way to exempt devices from this. 1108 */ 1109 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ 1110 (8*sizeof(long))) 1111 static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS]; 1112 1113 static char *no_auto = ""; 1114 1115 module_param(no_auto, charp, 0444); 1116 MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined"); 1117 1118 static int virtio_ccw_check_autoonline(struct ccw_device *cdev) 1119 { 1120 struct ccw_dev_id id; 1121 1122 ccw_device_get_id(cdev, &id); 1123 if (test_bit(id.devno, devs_no_auto[id.ssid])) 1124 return 0; 1125 return 1; 1126 } 1127 1128 static void virtio_ccw_auto_online(void *data, async_cookie_t cookie) 1129 { 1130 struct ccw_device *cdev = data; 1131 int ret; 1132 1133 ret = ccw_device_set_online(cdev); 1134 if (ret) 1135 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret); 1136 } 1137 1138 static int virtio_ccw_probe(struct ccw_device *cdev) 1139 { 1140 cdev->handler = virtio_ccw_int_handler; 1141 1142 if (virtio_ccw_check_autoonline(cdev)) 1143 async_schedule(virtio_ccw_auto_online, cdev); 1144 return 0; 1145 } 1146 1147 static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev) 1148 { 1149 unsigned long flags; 1150 struct virtio_ccw_device *vcdev; 1151 1152 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1153 vcdev = dev_get_drvdata(&cdev->dev); 1154 if (!vcdev || vcdev->going_away) { 1155 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1156 return NULL; 1157 } 1158 vcdev->going_away = true; 1159 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1160 return vcdev; 1161 } 1162 1163 static void virtio_ccw_remove(struct ccw_device *cdev) 1164 { 1165 unsigned long flags; 1166 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1167 1168 if (vcdev && cdev->online) { 1169 if (vcdev->device_lost) 1170 virtio_break_device(&vcdev->vdev); 1171 unregister_virtio_device(&vcdev->vdev); 1172 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1173 dev_set_drvdata(&cdev->dev, NULL); 1174 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1175 } 1176 cdev->handler = NULL; 1177 } 1178 1179 static int virtio_ccw_offline(struct ccw_device *cdev) 1180 { 1181 unsigned long flags; 1182 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1183 1184 if (!vcdev) 1185 return 0; 1186 if (vcdev->device_lost) 1187 virtio_break_device(&vcdev->vdev); 1188 unregister_virtio_device(&vcdev->vdev); 1189 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1190 dev_set_drvdata(&cdev->dev, NULL); 1191 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1192 return 0; 1193 } 1194 1195 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev) 1196 { 1197 struct virtio_rev_info *rev; 1198 struct ccw1 *ccw; 1199 int ret; 1200 1201 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 1202 if (!ccw) 1203 return -ENOMEM; 1204 rev = kzalloc(sizeof(*rev), GFP_DMA | GFP_KERNEL); 1205 if (!rev) { 1206 kfree(ccw); 1207 return -ENOMEM; 1208 } 1209 1210 /* Set transport revision */ 1211 ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV; 1212 ccw->flags = 0; 1213 ccw->count = sizeof(*rev); 1214 ccw->cda = (__u32)(unsigned long)rev; 1215 1216 vcdev->revision = VIRTIO_CCW_REV_MAX; 1217 do { 1218 rev->revision = vcdev->revision; 1219 /* none of our supported revisions carry payload */ 1220 rev->length = 0; 1221 ret = ccw_io_helper(vcdev, ccw, 1222 VIRTIO_CCW_DOING_SET_VIRTIO_REV); 1223 if (ret == -EOPNOTSUPP) { 1224 if (vcdev->revision == 0) 1225 /* 1226 * The host device does not support setting 1227 * the revision: let's operate it in legacy 1228 * mode. 1229 */ 1230 ret = 0; 1231 else 1232 vcdev->revision--; 1233 } 1234 } while (ret == -EOPNOTSUPP); 1235 1236 kfree(ccw); 1237 kfree(rev); 1238 return ret; 1239 } 1240 1241 static int virtio_ccw_online(struct ccw_device *cdev) 1242 { 1243 int ret; 1244 struct virtio_ccw_device *vcdev; 1245 unsigned long flags; 1246 1247 vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL); 1248 if (!vcdev) { 1249 dev_warn(&cdev->dev, "Could not get memory for virtio\n"); 1250 ret = -ENOMEM; 1251 goto out_free; 1252 } 1253 vcdev->config_block = kzalloc(sizeof(*vcdev->config_block), 1254 GFP_DMA | GFP_KERNEL); 1255 if (!vcdev->config_block) { 1256 ret = -ENOMEM; 1257 goto out_free; 1258 } 1259 vcdev->status = kzalloc(sizeof(*vcdev->status), GFP_DMA | GFP_KERNEL); 1260 if (!vcdev->status) { 1261 ret = -ENOMEM; 1262 goto out_free; 1263 } 1264 1265 vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */ 1266 1267 vcdev->vdev.dev.parent = &cdev->dev; 1268 vcdev->vdev.dev.release = virtio_ccw_release_dev; 1269 vcdev->vdev.config = &virtio_ccw_config_ops; 1270 vcdev->cdev = cdev; 1271 init_waitqueue_head(&vcdev->wait_q); 1272 INIT_LIST_HEAD(&vcdev->virtqueues); 1273 spin_lock_init(&vcdev->lock); 1274 mutex_init(&vcdev->io_lock); 1275 1276 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1277 dev_set_drvdata(&cdev->dev, vcdev); 1278 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1279 vcdev->vdev.id.vendor = cdev->id.cu_type; 1280 vcdev->vdev.id.device = cdev->id.cu_model; 1281 1282 ret = virtio_ccw_set_transport_rev(vcdev); 1283 if (ret) 1284 goto out_free; 1285 1286 ret = register_virtio_device(&vcdev->vdev); 1287 if (ret) { 1288 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n", 1289 ret); 1290 goto out_put; 1291 } 1292 return 0; 1293 out_put: 1294 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1295 dev_set_drvdata(&cdev->dev, NULL); 1296 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1297 put_device(&vcdev->vdev.dev); 1298 return ret; 1299 out_free: 1300 if (vcdev) { 1301 kfree(vcdev->status); 1302 kfree(vcdev->config_block); 1303 } 1304 kfree(vcdev); 1305 return ret; 1306 } 1307 1308 static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event) 1309 { 1310 int rc; 1311 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1312 1313 /* 1314 * Make sure vcdev is set 1315 * i.e. set_offline/remove callback not already running 1316 */ 1317 if (!vcdev) 1318 return NOTIFY_DONE; 1319 1320 switch (event) { 1321 case CIO_GONE: 1322 vcdev->device_lost = true; 1323 rc = NOTIFY_DONE; 1324 break; 1325 case CIO_OPER: 1326 rc = NOTIFY_OK; 1327 break; 1328 default: 1329 rc = NOTIFY_DONE; 1330 break; 1331 } 1332 return rc; 1333 } 1334 1335 static struct ccw_device_id virtio_ids[] = { 1336 { CCW_DEVICE(0x3832, 0) }, 1337 {}, 1338 }; 1339 1340 #ifdef CONFIG_PM_SLEEP 1341 static int virtio_ccw_freeze(struct ccw_device *cdev) 1342 { 1343 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1344 1345 return virtio_device_freeze(&vcdev->vdev); 1346 } 1347 1348 static int virtio_ccw_restore(struct ccw_device *cdev) 1349 { 1350 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1351 int ret; 1352 1353 ret = virtio_ccw_set_transport_rev(vcdev); 1354 if (ret) 1355 return ret; 1356 1357 return virtio_device_restore(&vcdev->vdev); 1358 } 1359 #endif 1360 1361 static struct ccw_driver virtio_ccw_driver = { 1362 .driver = { 1363 .owner = THIS_MODULE, 1364 .name = "virtio_ccw", 1365 }, 1366 .ids = virtio_ids, 1367 .probe = virtio_ccw_probe, 1368 .remove = virtio_ccw_remove, 1369 .set_offline = virtio_ccw_offline, 1370 .set_online = virtio_ccw_online, 1371 .notify = virtio_ccw_cio_notify, 1372 .int_class = IRQIO_VIR, 1373 #ifdef CONFIG_PM_SLEEP 1374 .freeze = virtio_ccw_freeze, 1375 .thaw = virtio_ccw_restore, 1376 .restore = virtio_ccw_restore, 1377 #endif 1378 }; 1379 1380 static int __init pure_hex(char **cp, unsigned int *val, int min_digit, 1381 int max_digit, int max_val) 1382 { 1383 int diff; 1384 1385 diff = 0; 1386 *val = 0; 1387 1388 while (diff <= max_digit) { 1389 int value = hex_to_bin(**cp); 1390 1391 if (value < 0) 1392 break; 1393 *val = *val * 16 + value; 1394 (*cp)++; 1395 diff++; 1396 } 1397 1398 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) 1399 return 1; 1400 1401 return 0; 1402 } 1403 1404 static int __init parse_busid(char *str, unsigned int *cssid, 1405 unsigned int *ssid, unsigned int *devno) 1406 { 1407 char *str_work; 1408 int rc, ret; 1409 1410 rc = 1; 1411 1412 if (*str == '\0') 1413 goto out; 1414 1415 str_work = str; 1416 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); 1417 if (ret || (str_work[0] != '.')) 1418 goto out; 1419 str_work++; 1420 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); 1421 if (ret || (str_work[0] != '.')) 1422 goto out; 1423 str_work++; 1424 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); 1425 if (ret || (str_work[0] != '\0')) 1426 goto out; 1427 1428 rc = 0; 1429 out: 1430 return rc; 1431 } 1432 1433 static void __init no_auto_parse(void) 1434 { 1435 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; 1436 char *parm, *str; 1437 int rc; 1438 1439 str = no_auto; 1440 while ((parm = strsep(&str, ","))) { 1441 rc = parse_busid(strsep(&parm, "-"), &from_cssid, 1442 &from_ssid, &from); 1443 if (rc) 1444 continue; 1445 if (parm != NULL) { 1446 rc = parse_busid(parm, &to_cssid, 1447 &to_ssid, &to); 1448 if ((from_ssid > to_ssid) || 1449 ((from_ssid == to_ssid) && (from > to))) 1450 rc = -EINVAL; 1451 } else { 1452 to_cssid = from_cssid; 1453 to_ssid = from_ssid; 1454 to = from; 1455 } 1456 if (rc) 1457 continue; 1458 while ((from_ssid < to_ssid) || 1459 ((from_ssid == to_ssid) && (from <= to))) { 1460 set_bit(from, devs_no_auto[from_ssid]); 1461 from++; 1462 if (from > __MAX_SUBCHANNEL) { 1463 from_ssid++; 1464 from = 0; 1465 } 1466 } 1467 } 1468 } 1469 1470 static int __init virtio_ccw_init(void) 1471 { 1472 /* parse no_auto string before we do anything further */ 1473 no_auto_parse(); 1474 return ccw_driver_register(&virtio_ccw_driver); 1475 } 1476 device_initcall(virtio_ccw_init); 1477