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 if (!vcdev->airq_info) 276 return; 277 list_for_each_entry(info, &vcdev->virtqueues, node) 278 drop_airq_indicator(info->vq, vcdev->airq_info); 279 } 280 281 static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag) 282 { 283 unsigned long flags; 284 __u32 ret; 285 286 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); 287 if (vcdev->err) 288 ret = 0; 289 else 290 ret = vcdev->curr_io & flag; 291 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); 292 return ret; 293 } 294 295 static int ccw_io_helper(struct virtio_ccw_device *vcdev, 296 struct ccw1 *ccw, __u32 intparm) 297 { 298 int ret; 299 unsigned long flags; 300 int flag = intparm & VIRTIO_CCW_INTPARM_MASK; 301 302 mutex_lock(&vcdev->io_lock); 303 do { 304 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); 305 ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0); 306 if (!ret) { 307 if (!vcdev->curr_io) 308 vcdev->err = 0; 309 vcdev->curr_io |= flag; 310 } 311 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); 312 cpu_relax(); 313 } while (ret == -EBUSY); 314 wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0); 315 ret = ret ? ret : vcdev->err; 316 mutex_unlock(&vcdev->io_lock); 317 return ret; 318 } 319 320 static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev, 321 struct ccw1 *ccw) 322 { 323 int ret; 324 unsigned long *indicatorp = NULL; 325 struct virtio_thinint_area *thinint_area = NULL; 326 struct airq_info *airq_info = vcdev->airq_info; 327 328 if (vcdev->is_thinint) { 329 thinint_area = kzalloc(sizeof(*thinint_area), 330 GFP_DMA | GFP_KERNEL); 331 if (!thinint_area) 332 return; 333 thinint_area->summary_indicator = 334 (unsigned long) &airq_info->summary_indicator; 335 thinint_area->isc = VIRTIO_AIRQ_ISC; 336 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; 337 ccw->count = sizeof(*thinint_area); 338 ccw->cda = (__u32)(unsigned long) thinint_area; 339 } else { 340 /* payload is the address of the indicators */ 341 indicatorp = kmalloc(sizeof(&vcdev->indicators), 342 GFP_DMA | GFP_KERNEL); 343 if (!indicatorp) 344 return; 345 *indicatorp = 0; 346 ccw->cmd_code = CCW_CMD_SET_IND; 347 ccw->count = sizeof(&vcdev->indicators); 348 ccw->cda = (__u32)(unsigned long) indicatorp; 349 } 350 /* Deregister indicators from host. */ 351 vcdev->indicators = 0; 352 ccw->flags = 0; 353 ret = ccw_io_helper(vcdev, ccw, 354 vcdev->is_thinint ? 355 VIRTIO_CCW_DOING_SET_IND_ADAPTER : 356 VIRTIO_CCW_DOING_SET_IND); 357 if (ret && (ret != -ENODEV)) 358 dev_info(&vcdev->cdev->dev, 359 "Failed to deregister indicators (%d)\n", ret); 360 else if (vcdev->is_thinint) 361 virtio_ccw_drop_indicators(vcdev); 362 kfree(indicatorp); 363 kfree(thinint_area); 364 } 365 366 static inline long __do_kvm_notify(struct subchannel_id schid, 367 unsigned long queue_index, 368 long cookie) 369 { 370 register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY; 371 register struct subchannel_id __schid asm("2") = schid; 372 register unsigned long __index asm("3") = queue_index; 373 register long __rc asm("2"); 374 register long __cookie asm("4") = cookie; 375 376 asm volatile ("diag 2,4,0x500\n" 377 : "=d" (__rc) : "d" (__nr), "d" (__schid), "d" (__index), 378 "d"(__cookie) 379 : "memory", "cc"); 380 return __rc; 381 } 382 383 static inline long do_kvm_notify(struct subchannel_id schid, 384 unsigned long queue_index, 385 long cookie) 386 { 387 diag_stat_inc(DIAG_STAT_X500); 388 return __do_kvm_notify(schid, queue_index, cookie); 389 } 390 391 static bool virtio_ccw_kvm_notify(struct virtqueue *vq) 392 { 393 struct virtio_ccw_vq_info *info = vq->priv; 394 struct virtio_ccw_device *vcdev; 395 struct subchannel_id schid; 396 397 vcdev = to_vc_device(info->vq->vdev); 398 ccw_device_get_schid(vcdev->cdev, &schid); 399 info->cookie = do_kvm_notify(schid, vq->index, info->cookie); 400 if (info->cookie < 0) 401 return false; 402 return true; 403 } 404 405 static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev, 406 struct ccw1 *ccw, int index) 407 { 408 int ret; 409 410 vcdev->config_block->index = index; 411 ccw->cmd_code = CCW_CMD_READ_VQ_CONF; 412 ccw->flags = 0; 413 ccw->count = sizeof(struct vq_config_block); 414 ccw->cda = (__u32)(unsigned long)(vcdev->config_block); 415 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF); 416 if (ret) 417 return ret; 418 return vcdev->config_block->num ?: -ENOENT; 419 } 420 421 static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw) 422 { 423 struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev); 424 struct virtio_ccw_vq_info *info = vq->priv; 425 unsigned long flags; 426 unsigned long size; 427 int ret; 428 unsigned int index = vq->index; 429 430 /* Remove from our list. */ 431 spin_lock_irqsave(&vcdev->lock, flags); 432 list_del(&info->node); 433 spin_unlock_irqrestore(&vcdev->lock, flags); 434 435 /* Release from host. */ 436 if (vcdev->revision == 0) { 437 info->info_block->l.queue = 0; 438 info->info_block->l.align = 0; 439 info->info_block->l.index = index; 440 info->info_block->l.num = 0; 441 ccw->count = sizeof(info->info_block->l); 442 } else { 443 info->info_block->s.desc = 0; 444 info->info_block->s.index = index; 445 info->info_block->s.num = 0; 446 info->info_block->s.avail = 0; 447 info->info_block->s.used = 0; 448 ccw->count = sizeof(info->info_block->s); 449 } 450 ccw->cmd_code = CCW_CMD_SET_VQ; 451 ccw->flags = 0; 452 ccw->cda = (__u32)(unsigned long)(info->info_block); 453 ret = ccw_io_helper(vcdev, ccw, 454 VIRTIO_CCW_DOING_SET_VQ | index); 455 /* 456 * -ENODEV isn't considered an error: The device is gone anyway. 457 * This may happen on device detach. 458 */ 459 if (ret && (ret != -ENODEV)) 460 dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d\n", 461 ret, index); 462 463 vring_del_virtqueue(vq); 464 size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN)); 465 free_pages_exact(info->queue, size); 466 kfree(info->info_block); 467 kfree(info); 468 } 469 470 static void virtio_ccw_del_vqs(struct virtio_device *vdev) 471 { 472 struct virtqueue *vq, *n; 473 struct ccw1 *ccw; 474 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 475 476 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 477 if (!ccw) 478 return; 479 480 virtio_ccw_drop_indicator(vcdev, ccw); 481 482 list_for_each_entry_safe(vq, n, &vdev->vqs, list) 483 virtio_ccw_del_vq(vq, ccw); 484 485 kfree(ccw); 486 } 487 488 static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev, 489 int i, vq_callback_t *callback, 490 const char *name, bool ctx, 491 struct ccw1 *ccw) 492 { 493 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 494 int err; 495 struct virtqueue *vq = NULL; 496 struct virtio_ccw_vq_info *info; 497 unsigned long size = 0; /* silence the compiler */ 498 unsigned long flags; 499 500 /* Allocate queue. */ 501 info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL); 502 if (!info) { 503 dev_warn(&vcdev->cdev->dev, "no info\n"); 504 err = -ENOMEM; 505 goto out_err; 506 } 507 info->info_block = kzalloc(sizeof(*info->info_block), 508 GFP_DMA | GFP_KERNEL); 509 if (!info->info_block) { 510 dev_warn(&vcdev->cdev->dev, "no info block\n"); 511 err = -ENOMEM; 512 goto out_err; 513 } 514 info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i); 515 if (info->num < 0) { 516 err = info->num; 517 goto out_err; 518 } 519 size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN)); 520 info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO); 521 if (info->queue == NULL) { 522 dev_warn(&vcdev->cdev->dev, "no queue\n"); 523 err = -ENOMEM; 524 goto out_err; 525 } 526 527 vq = vring_new_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, vdev, 528 true, ctx, info->queue, virtio_ccw_kvm_notify, 529 callback, name); 530 if (!vq) { 531 /* For now, we fail if we can't get the requested size. */ 532 dev_warn(&vcdev->cdev->dev, "no vq\n"); 533 err = -ENOMEM; 534 goto out_err; 535 } 536 537 /* Register it with the host. */ 538 if (vcdev->revision == 0) { 539 info->info_block->l.queue = (__u64)info->queue; 540 info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN; 541 info->info_block->l.index = i; 542 info->info_block->l.num = info->num; 543 ccw->count = sizeof(info->info_block->l); 544 } else { 545 info->info_block->s.desc = (__u64)info->queue; 546 info->info_block->s.index = i; 547 info->info_block->s.num = info->num; 548 info->info_block->s.avail = (__u64)virtqueue_get_avail(vq); 549 info->info_block->s.used = (__u64)virtqueue_get_used(vq); 550 ccw->count = sizeof(info->info_block->s); 551 } 552 ccw->cmd_code = CCW_CMD_SET_VQ; 553 ccw->flags = 0; 554 ccw->cda = (__u32)(unsigned long)(info->info_block); 555 err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i); 556 if (err) { 557 dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n"); 558 goto out_err; 559 } 560 561 info->vq = vq; 562 vq->priv = info; 563 564 /* Save it to our list. */ 565 spin_lock_irqsave(&vcdev->lock, flags); 566 list_add(&info->node, &vcdev->virtqueues); 567 spin_unlock_irqrestore(&vcdev->lock, flags); 568 569 return vq; 570 571 out_err: 572 if (vq) 573 vring_del_virtqueue(vq); 574 if (info) { 575 if (info->queue) 576 free_pages_exact(info->queue, size); 577 kfree(info->info_block); 578 } 579 kfree(info); 580 return ERR_PTR(err); 581 } 582 583 static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev, 584 struct virtqueue *vqs[], int nvqs, 585 struct ccw1 *ccw) 586 { 587 int ret; 588 struct virtio_thinint_area *thinint_area = NULL; 589 struct airq_info *info; 590 591 thinint_area = kzalloc(sizeof(*thinint_area), GFP_DMA | GFP_KERNEL); 592 if (!thinint_area) { 593 ret = -ENOMEM; 594 goto out; 595 } 596 /* Try to get an indicator. */ 597 thinint_area->indicator = get_airq_indicator(vqs, nvqs, 598 &thinint_area->bit_nr, 599 &vcdev->airq_info); 600 if (!thinint_area->indicator) { 601 ret = -ENOSPC; 602 goto out; 603 } 604 info = vcdev->airq_info; 605 thinint_area->summary_indicator = 606 (unsigned long) &info->summary_indicator; 607 thinint_area->isc = VIRTIO_AIRQ_ISC; 608 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; 609 ccw->flags = CCW_FLAG_SLI; 610 ccw->count = sizeof(*thinint_area); 611 ccw->cda = (__u32)(unsigned long)thinint_area; 612 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER); 613 if (ret) { 614 if (ret == -EOPNOTSUPP) { 615 /* 616 * The host does not support adapter interrupts 617 * for virtio-ccw, stop trying. 618 */ 619 virtio_ccw_use_airq = 0; 620 pr_info("Adapter interrupts unsupported on host\n"); 621 } else 622 dev_warn(&vcdev->cdev->dev, 623 "enabling adapter interrupts = %d\n", ret); 624 virtio_ccw_drop_indicators(vcdev); 625 } 626 out: 627 kfree(thinint_area); 628 return ret; 629 } 630 631 static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, 632 struct virtqueue *vqs[], 633 vq_callback_t *callbacks[], 634 const char * const names[], 635 const bool *ctx, 636 struct irq_affinity *desc) 637 { 638 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 639 unsigned long *indicatorp = NULL; 640 int ret, i, queue_idx = 0; 641 struct ccw1 *ccw; 642 643 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 644 if (!ccw) 645 return -ENOMEM; 646 647 for (i = 0; i < nvqs; ++i) { 648 if (!names[i]) { 649 vqs[i] = NULL; 650 continue; 651 } 652 653 vqs[i] = virtio_ccw_setup_vq(vdev, queue_idx++, callbacks[i], 654 names[i], ctx ? ctx[i] : false, 655 ccw); 656 if (IS_ERR(vqs[i])) { 657 ret = PTR_ERR(vqs[i]); 658 vqs[i] = NULL; 659 goto out; 660 } 661 } 662 ret = -ENOMEM; 663 /* 664 * We need a data area under 2G to communicate. Our payload is 665 * the address of the indicators. 666 */ 667 indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL); 668 if (!indicatorp) 669 goto out; 670 *indicatorp = (unsigned long) &vcdev->indicators; 671 if (vcdev->is_thinint) { 672 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw); 673 if (ret) 674 /* no error, just fall back to legacy interrupts */ 675 vcdev->is_thinint = false; 676 } 677 if (!vcdev->is_thinint) { 678 /* Register queue indicators with host. */ 679 vcdev->indicators = 0; 680 ccw->cmd_code = CCW_CMD_SET_IND; 681 ccw->flags = 0; 682 ccw->count = sizeof(&vcdev->indicators); 683 ccw->cda = (__u32)(unsigned long) indicatorp; 684 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND); 685 if (ret) 686 goto out; 687 } 688 /* Register indicators2 with host for config changes */ 689 *indicatorp = (unsigned long) &vcdev->indicators2; 690 vcdev->indicators2 = 0; 691 ccw->cmd_code = CCW_CMD_SET_CONF_IND; 692 ccw->flags = 0; 693 ccw->count = sizeof(&vcdev->indicators2); 694 ccw->cda = (__u32)(unsigned long) indicatorp; 695 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND); 696 if (ret) 697 goto out; 698 699 kfree(indicatorp); 700 kfree(ccw); 701 return 0; 702 out: 703 kfree(indicatorp); 704 kfree(ccw); 705 virtio_ccw_del_vqs(vdev); 706 return ret; 707 } 708 709 static void virtio_ccw_reset(struct virtio_device *vdev) 710 { 711 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 712 struct ccw1 *ccw; 713 714 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 715 if (!ccw) 716 return; 717 718 /* Zero status bits. */ 719 *vcdev->status = 0; 720 721 /* Send a reset ccw on device. */ 722 ccw->cmd_code = CCW_CMD_VDEV_RESET; 723 ccw->flags = 0; 724 ccw->count = 0; 725 ccw->cda = 0; 726 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET); 727 kfree(ccw); 728 } 729 730 static u64 virtio_ccw_get_features(struct virtio_device *vdev) 731 { 732 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 733 struct virtio_feature_desc *features; 734 int ret; 735 u64 rc; 736 struct ccw1 *ccw; 737 738 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 739 if (!ccw) 740 return 0; 741 742 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL); 743 if (!features) { 744 rc = 0; 745 goto out_free; 746 } 747 /* Read the feature bits from the host. */ 748 features->index = 0; 749 ccw->cmd_code = CCW_CMD_READ_FEAT; 750 ccw->flags = 0; 751 ccw->count = sizeof(*features); 752 ccw->cda = (__u32)(unsigned long)features; 753 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 754 if (ret) { 755 rc = 0; 756 goto out_free; 757 } 758 759 rc = le32_to_cpu(features->features); 760 761 if (vcdev->revision == 0) 762 goto out_free; 763 764 /* Read second half of the feature bits from the host. */ 765 features->index = 1; 766 ccw->cmd_code = CCW_CMD_READ_FEAT; 767 ccw->flags = 0; 768 ccw->count = sizeof(*features); 769 ccw->cda = (__u32)(unsigned long)features; 770 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 771 if (ret == 0) 772 rc |= (u64)le32_to_cpu(features->features) << 32; 773 774 out_free: 775 kfree(features); 776 kfree(ccw); 777 return rc; 778 } 779 780 static void ccw_transport_features(struct virtio_device *vdev) 781 { 782 /* 783 * Packed ring isn't enabled on virtio_ccw for now, 784 * because virtio_ccw uses some legacy accessors, 785 * e.g. virtqueue_get_avail() and virtqueue_get_used() 786 * which aren't available in packed ring currently. 787 */ 788 __virtio_clear_bit(vdev, VIRTIO_F_RING_PACKED); 789 } 790 791 static int virtio_ccw_finalize_features(struct virtio_device *vdev) 792 { 793 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 794 struct virtio_feature_desc *features; 795 struct ccw1 *ccw; 796 int ret; 797 798 if (vcdev->revision >= 1 && 799 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { 800 dev_err(&vdev->dev, "virtio: device uses revision 1 " 801 "but does not have VIRTIO_F_VERSION_1\n"); 802 return -EINVAL; 803 } 804 805 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 806 if (!ccw) 807 return -ENOMEM; 808 809 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL); 810 if (!features) { 811 ret = -ENOMEM; 812 goto out_free; 813 } 814 /* Give virtio_ring a chance to accept features. */ 815 vring_transport_features(vdev); 816 817 /* Give virtio_ccw a chance to accept features. */ 818 ccw_transport_features(vdev); 819 820 features->index = 0; 821 features->features = cpu_to_le32((u32)vdev->features); 822 /* Write the first half of the feature bits to the host. */ 823 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 824 ccw->flags = 0; 825 ccw->count = sizeof(*features); 826 ccw->cda = (__u32)(unsigned long)features; 827 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 828 if (ret) 829 goto out_free; 830 831 if (vcdev->revision == 0) 832 goto out_free; 833 834 features->index = 1; 835 features->features = cpu_to_le32(vdev->features >> 32); 836 /* Write the second half of the feature bits to the host. */ 837 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 838 ccw->flags = 0; 839 ccw->count = sizeof(*features); 840 ccw->cda = (__u32)(unsigned long)features; 841 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 842 843 out_free: 844 kfree(features); 845 kfree(ccw); 846 847 return ret; 848 } 849 850 static void virtio_ccw_get_config(struct virtio_device *vdev, 851 unsigned int offset, void *buf, unsigned len) 852 { 853 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 854 int ret; 855 struct ccw1 *ccw; 856 void *config_area; 857 unsigned long flags; 858 859 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 860 if (!ccw) 861 return; 862 863 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL); 864 if (!config_area) 865 goto out_free; 866 867 /* Read the config area from the host. */ 868 ccw->cmd_code = CCW_CMD_READ_CONF; 869 ccw->flags = 0; 870 ccw->count = offset + len; 871 ccw->cda = (__u32)(unsigned long)config_area; 872 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG); 873 if (ret) 874 goto out_free; 875 876 spin_lock_irqsave(&vcdev->lock, flags); 877 memcpy(vcdev->config, config_area, offset + len); 878 if (vcdev->config_ready < offset + len) 879 vcdev->config_ready = offset + len; 880 spin_unlock_irqrestore(&vcdev->lock, flags); 881 if (buf) 882 memcpy(buf, config_area + offset, len); 883 884 out_free: 885 kfree(config_area); 886 kfree(ccw); 887 } 888 889 static void virtio_ccw_set_config(struct virtio_device *vdev, 890 unsigned int offset, const void *buf, 891 unsigned len) 892 { 893 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 894 struct ccw1 *ccw; 895 void *config_area; 896 unsigned long flags; 897 898 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 899 if (!ccw) 900 return; 901 902 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL); 903 if (!config_area) 904 goto out_free; 905 906 /* Make sure we don't overwrite fields. */ 907 if (vcdev->config_ready < offset) 908 virtio_ccw_get_config(vdev, 0, NULL, offset); 909 spin_lock_irqsave(&vcdev->lock, flags); 910 memcpy(&vcdev->config[offset], buf, len); 911 /* Write the config area to the host. */ 912 memcpy(config_area, vcdev->config, sizeof(vcdev->config)); 913 spin_unlock_irqrestore(&vcdev->lock, flags); 914 ccw->cmd_code = CCW_CMD_WRITE_CONF; 915 ccw->flags = 0; 916 ccw->count = offset + len; 917 ccw->cda = (__u32)(unsigned long)config_area; 918 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG); 919 920 out_free: 921 kfree(config_area); 922 kfree(ccw); 923 } 924 925 static u8 virtio_ccw_get_status(struct virtio_device *vdev) 926 { 927 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 928 u8 old_status = *vcdev->status; 929 struct ccw1 *ccw; 930 931 if (vcdev->revision < 1) 932 return *vcdev->status; 933 934 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 935 if (!ccw) 936 return old_status; 937 938 ccw->cmd_code = CCW_CMD_READ_STATUS; 939 ccw->flags = 0; 940 ccw->count = sizeof(*vcdev->status); 941 ccw->cda = (__u32)(unsigned long)vcdev->status; 942 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS); 943 /* 944 * If the channel program failed (should only happen if the device 945 * was hotunplugged, and then we clean up via the machine check 946 * handler anyway), vcdev->status was not overwritten and we just 947 * return the old status, which is fine. 948 */ 949 kfree(ccw); 950 951 return *vcdev->status; 952 } 953 954 static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status) 955 { 956 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 957 u8 old_status = *vcdev->status; 958 struct ccw1 *ccw; 959 int ret; 960 961 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 962 if (!ccw) 963 return; 964 965 /* Write the status to the host. */ 966 *vcdev->status = status; 967 ccw->cmd_code = CCW_CMD_WRITE_STATUS; 968 ccw->flags = 0; 969 ccw->count = sizeof(status); 970 ccw->cda = (__u32)(unsigned long)vcdev->status; 971 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS); 972 /* Write failed? We assume status is unchanged. */ 973 if (ret) 974 *vcdev->status = old_status; 975 kfree(ccw); 976 } 977 978 static const char *virtio_ccw_bus_name(struct virtio_device *vdev) 979 { 980 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 981 982 return dev_name(&vcdev->cdev->dev); 983 } 984 985 static const struct virtio_config_ops virtio_ccw_config_ops = { 986 .get_features = virtio_ccw_get_features, 987 .finalize_features = virtio_ccw_finalize_features, 988 .get = virtio_ccw_get_config, 989 .set = virtio_ccw_set_config, 990 .get_status = virtio_ccw_get_status, 991 .set_status = virtio_ccw_set_status, 992 .reset = virtio_ccw_reset, 993 .find_vqs = virtio_ccw_find_vqs, 994 .del_vqs = virtio_ccw_del_vqs, 995 .bus_name = virtio_ccw_bus_name, 996 }; 997 998 999 /* 1000 * ccw bus driver related functions 1001 */ 1002 1003 static void virtio_ccw_release_dev(struct device *_d) 1004 { 1005 struct virtio_device *dev = dev_to_virtio(_d); 1006 struct virtio_ccw_device *vcdev = to_vc_device(dev); 1007 1008 kfree(vcdev->status); 1009 kfree(vcdev->config_block); 1010 kfree(vcdev); 1011 } 1012 1013 static int irb_is_error(struct irb *irb) 1014 { 1015 if (scsw_cstat(&irb->scsw) != 0) 1016 return 1; 1017 if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) 1018 return 1; 1019 if (scsw_cc(&irb->scsw) != 0) 1020 return 1; 1021 return 0; 1022 } 1023 1024 static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev, 1025 int index) 1026 { 1027 struct virtio_ccw_vq_info *info; 1028 unsigned long flags; 1029 struct virtqueue *vq; 1030 1031 vq = NULL; 1032 spin_lock_irqsave(&vcdev->lock, flags); 1033 list_for_each_entry(info, &vcdev->virtqueues, node) { 1034 if (info->vq->index == index) { 1035 vq = info->vq; 1036 break; 1037 } 1038 } 1039 spin_unlock_irqrestore(&vcdev->lock, flags); 1040 return vq; 1041 } 1042 1043 static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev, 1044 __u32 activity) 1045 { 1046 if (vcdev->curr_io & activity) { 1047 switch (activity) { 1048 case VIRTIO_CCW_DOING_READ_FEAT: 1049 case VIRTIO_CCW_DOING_WRITE_FEAT: 1050 case VIRTIO_CCW_DOING_READ_CONFIG: 1051 case VIRTIO_CCW_DOING_WRITE_CONFIG: 1052 case VIRTIO_CCW_DOING_WRITE_STATUS: 1053 case VIRTIO_CCW_DOING_READ_STATUS: 1054 case VIRTIO_CCW_DOING_SET_VQ: 1055 case VIRTIO_CCW_DOING_SET_IND: 1056 case VIRTIO_CCW_DOING_SET_CONF_IND: 1057 case VIRTIO_CCW_DOING_RESET: 1058 case VIRTIO_CCW_DOING_READ_VQ_CONF: 1059 case VIRTIO_CCW_DOING_SET_IND_ADAPTER: 1060 case VIRTIO_CCW_DOING_SET_VIRTIO_REV: 1061 vcdev->curr_io &= ~activity; 1062 wake_up(&vcdev->wait_q); 1063 break; 1064 default: 1065 /* don't know what to do... */ 1066 dev_warn(&vcdev->cdev->dev, 1067 "Suspicious activity '%08x'\n", activity); 1068 WARN_ON(1); 1069 break; 1070 } 1071 } 1072 } 1073 1074 static void virtio_ccw_int_handler(struct ccw_device *cdev, 1075 unsigned long intparm, 1076 struct irb *irb) 1077 { 1078 __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK; 1079 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1080 int i; 1081 struct virtqueue *vq; 1082 1083 if (!vcdev) 1084 return; 1085 if (IS_ERR(irb)) { 1086 vcdev->err = PTR_ERR(irb); 1087 virtio_ccw_check_activity(vcdev, activity); 1088 /* Don't poke around indicators, something's wrong. */ 1089 return; 1090 } 1091 /* Check if it's a notification from the host. */ 1092 if ((intparm == 0) && 1093 (scsw_stctl(&irb->scsw) == 1094 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) { 1095 /* OK */ 1096 } 1097 if (irb_is_error(irb)) { 1098 /* Command reject? */ 1099 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) && 1100 (irb->ecw[0] & SNS0_CMD_REJECT)) 1101 vcdev->err = -EOPNOTSUPP; 1102 else 1103 /* Map everything else to -EIO. */ 1104 vcdev->err = -EIO; 1105 } 1106 virtio_ccw_check_activity(vcdev, activity); 1107 for_each_set_bit(i, &vcdev->indicators, 1108 sizeof(vcdev->indicators) * BITS_PER_BYTE) { 1109 /* The bit clear must happen before the vring kick. */ 1110 clear_bit(i, &vcdev->indicators); 1111 barrier(); 1112 vq = virtio_ccw_vq_by_ind(vcdev, i); 1113 vring_interrupt(0, vq); 1114 } 1115 if (test_bit(0, &vcdev->indicators2)) { 1116 virtio_config_changed(&vcdev->vdev); 1117 clear_bit(0, &vcdev->indicators2); 1118 } 1119 } 1120 1121 /* 1122 * We usually want to autoonline all devices, but give the admin 1123 * a way to exempt devices from this. 1124 */ 1125 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ 1126 (8*sizeof(long))) 1127 static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS]; 1128 1129 static char *no_auto = ""; 1130 1131 module_param(no_auto, charp, 0444); 1132 MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined"); 1133 1134 static int virtio_ccw_check_autoonline(struct ccw_device *cdev) 1135 { 1136 struct ccw_dev_id id; 1137 1138 ccw_device_get_id(cdev, &id); 1139 if (test_bit(id.devno, devs_no_auto[id.ssid])) 1140 return 0; 1141 return 1; 1142 } 1143 1144 static void virtio_ccw_auto_online(void *data, async_cookie_t cookie) 1145 { 1146 struct ccw_device *cdev = data; 1147 int ret; 1148 1149 ret = ccw_device_set_online(cdev); 1150 if (ret) 1151 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret); 1152 } 1153 1154 static int virtio_ccw_probe(struct ccw_device *cdev) 1155 { 1156 cdev->handler = virtio_ccw_int_handler; 1157 1158 if (virtio_ccw_check_autoonline(cdev)) 1159 async_schedule(virtio_ccw_auto_online, cdev); 1160 return 0; 1161 } 1162 1163 static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev) 1164 { 1165 unsigned long flags; 1166 struct virtio_ccw_device *vcdev; 1167 1168 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1169 vcdev = dev_get_drvdata(&cdev->dev); 1170 if (!vcdev || vcdev->going_away) { 1171 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1172 return NULL; 1173 } 1174 vcdev->going_away = true; 1175 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1176 return vcdev; 1177 } 1178 1179 static void virtio_ccw_remove(struct ccw_device *cdev) 1180 { 1181 unsigned long flags; 1182 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1183 1184 if (vcdev && cdev->online) { 1185 if (vcdev->device_lost) 1186 virtio_break_device(&vcdev->vdev); 1187 unregister_virtio_device(&vcdev->vdev); 1188 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1189 dev_set_drvdata(&cdev->dev, NULL); 1190 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1191 } 1192 cdev->handler = NULL; 1193 } 1194 1195 static int virtio_ccw_offline(struct ccw_device *cdev) 1196 { 1197 unsigned long flags; 1198 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1199 1200 if (!vcdev) 1201 return 0; 1202 if (vcdev->device_lost) 1203 virtio_break_device(&vcdev->vdev); 1204 unregister_virtio_device(&vcdev->vdev); 1205 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1206 dev_set_drvdata(&cdev->dev, NULL); 1207 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1208 return 0; 1209 } 1210 1211 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev) 1212 { 1213 struct virtio_rev_info *rev; 1214 struct ccw1 *ccw; 1215 int ret; 1216 1217 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 1218 if (!ccw) 1219 return -ENOMEM; 1220 rev = kzalloc(sizeof(*rev), GFP_DMA | GFP_KERNEL); 1221 if (!rev) { 1222 kfree(ccw); 1223 return -ENOMEM; 1224 } 1225 1226 /* Set transport revision */ 1227 ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV; 1228 ccw->flags = 0; 1229 ccw->count = sizeof(*rev); 1230 ccw->cda = (__u32)(unsigned long)rev; 1231 1232 vcdev->revision = VIRTIO_CCW_REV_MAX; 1233 do { 1234 rev->revision = vcdev->revision; 1235 /* none of our supported revisions carry payload */ 1236 rev->length = 0; 1237 ret = ccw_io_helper(vcdev, ccw, 1238 VIRTIO_CCW_DOING_SET_VIRTIO_REV); 1239 if (ret == -EOPNOTSUPP) { 1240 if (vcdev->revision == 0) 1241 /* 1242 * The host device does not support setting 1243 * the revision: let's operate it in legacy 1244 * mode. 1245 */ 1246 ret = 0; 1247 else 1248 vcdev->revision--; 1249 } 1250 } while (ret == -EOPNOTSUPP); 1251 1252 kfree(ccw); 1253 kfree(rev); 1254 return ret; 1255 } 1256 1257 static int virtio_ccw_online(struct ccw_device *cdev) 1258 { 1259 int ret; 1260 struct virtio_ccw_device *vcdev; 1261 unsigned long flags; 1262 1263 vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL); 1264 if (!vcdev) { 1265 dev_warn(&cdev->dev, "Could not get memory for virtio\n"); 1266 ret = -ENOMEM; 1267 goto out_free; 1268 } 1269 vcdev->config_block = kzalloc(sizeof(*vcdev->config_block), 1270 GFP_DMA | GFP_KERNEL); 1271 if (!vcdev->config_block) { 1272 ret = -ENOMEM; 1273 goto out_free; 1274 } 1275 vcdev->status = kzalloc(sizeof(*vcdev->status), GFP_DMA | GFP_KERNEL); 1276 if (!vcdev->status) { 1277 ret = -ENOMEM; 1278 goto out_free; 1279 } 1280 1281 vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */ 1282 1283 vcdev->vdev.dev.parent = &cdev->dev; 1284 vcdev->vdev.dev.release = virtio_ccw_release_dev; 1285 vcdev->vdev.config = &virtio_ccw_config_ops; 1286 vcdev->cdev = cdev; 1287 init_waitqueue_head(&vcdev->wait_q); 1288 INIT_LIST_HEAD(&vcdev->virtqueues); 1289 spin_lock_init(&vcdev->lock); 1290 mutex_init(&vcdev->io_lock); 1291 1292 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1293 dev_set_drvdata(&cdev->dev, vcdev); 1294 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1295 vcdev->vdev.id.vendor = cdev->id.cu_type; 1296 vcdev->vdev.id.device = cdev->id.cu_model; 1297 1298 ret = virtio_ccw_set_transport_rev(vcdev); 1299 if (ret) 1300 goto out_free; 1301 1302 ret = register_virtio_device(&vcdev->vdev); 1303 if (ret) { 1304 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n", 1305 ret); 1306 goto out_put; 1307 } 1308 return 0; 1309 out_put: 1310 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1311 dev_set_drvdata(&cdev->dev, NULL); 1312 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1313 put_device(&vcdev->vdev.dev); 1314 return ret; 1315 out_free: 1316 if (vcdev) { 1317 kfree(vcdev->status); 1318 kfree(vcdev->config_block); 1319 } 1320 kfree(vcdev); 1321 return ret; 1322 } 1323 1324 static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event) 1325 { 1326 int rc; 1327 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1328 1329 /* 1330 * Make sure vcdev is set 1331 * i.e. set_offline/remove callback not already running 1332 */ 1333 if (!vcdev) 1334 return NOTIFY_DONE; 1335 1336 switch (event) { 1337 case CIO_GONE: 1338 vcdev->device_lost = true; 1339 rc = NOTIFY_DONE; 1340 break; 1341 case CIO_OPER: 1342 rc = NOTIFY_OK; 1343 break; 1344 default: 1345 rc = NOTIFY_DONE; 1346 break; 1347 } 1348 return rc; 1349 } 1350 1351 static struct ccw_device_id virtio_ids[] = { 1352 { CCW_DEVICE(0x3832, 0) }, 1353 {}, 1354 }; 1355 1356 #ifdef CONFIG_PM_SLEEP 1357 static int virtio_ccw_freeze(struct ccw_device *cdev) 1358 { 1359 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1360 1361 return virtio_device_freeze(&vcdev->vdev); 1362 } 1363 1364 static int virtio_ccw_restore(struct ccw_device *cdev) 1365 { 1366 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1367 int ret; 1368 1369 ret = virtio_ccw_set_transport_rev(vcdev); 1370 if (ret) 1371 return ret; 1372 1373 return virtio_device_restore(&vcdev->vdev); 1374 } 1375 #endif 1376 1377 static struct ccw_driver virtio_ccw_driver = { 1378 .driver = { 1379 .owner = THIS_MODULE, 1380 .name = "virtio_ccw", 1381 }, 1382 .ids = virtio_ids, 1383 .probe = virtio_ccw_probe, 1384 .remove = virtio_ccw_remove, 1385 .set_offline = virtio_ccw_offline, 1386 .set_online = virtio_ccw_online, 1387 .notify = virtio_ccw_cio_notify, 1388 .int_class = IRQIO_VIR, 1389 #ifdef CONFIG_PM_SLEEP 1390 .freeze = virtio_ccw_freeze, 1391 .thaw = virtio_ccw_restore, 1392 .restore = virtio_ccw_restore, 1393 #endif 1394 }; 1395 1396 static int __init pure_hex(char **cp, unsigned int *val, int min_digit, 1397 int max_digit, int max_val) 1398 { 1399 int diff; 1400 1401 diff = 0; 1402 *val = 0; 1403 1404 while (diff <= max_digit) { 1405 int value = hex_to_bin(**cp); 1406 1407 if (value < 0) 1408 break; 1409 *val = *val * 16 + value; 1410 (*cp)++; 1411 diff++; 1412 } 1413 1414 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) 1415 return 1; 1416 1417 return 0; 1418 } 1419 1420 static int __init parse_busid(char *str, unsigned int *cssid, 1421 unsigned int *ssid, unsigned int *devno) 1422 { 1423 char *str_work; 1424 int rc, ret; 1425 1426 rc = 1; 1427 1428 if (*str == '\0') 1429 goto out; 1430 1431 str_work = str; 1432 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); 1433 if (ret || (str_work[0] != '.')) 1434 goto out; 1435 str_work++; 1436 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); 1437 if (ret || (str_work[0] != '.')) 1438 goto out; 1439 str_work++; 1440 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); 1441 if (ret || (str_work[0] != '\0')) 1442 goto out; 1443 1444 rc = 0; 1445 out: 1446 return rc; 1447 } 1448 1449 static void __init no_auto_parse(void) 1450 { 1451 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; 1452 char *parm, *str; 1453 int rc; 1454 1455 str = no_auto; 1456 while ((parm = strsep(&str, ","))) { 1457 rc = parse_busid(strsep(&parm, "-"), &from_cssid, 1458 &from_ssid, &from); 1459 if (rc) 1460 continue; 1461 if (parm != NULL) { 1462 rc = parse_busid(parm, &to_cssid, 1463 &to_ssid, &to); 1464 if ((from_ssid > to_ssid) || 1465 ((from_ssid == to_ssid) && (from > to))) 1466 rc = -EINVAL; 1467 } else { 1468 to_cssid = from_cssid; 1469 to_ssid = from_ssid; 1470 to = from; 1471 } 1472 if (rc) 1473 continue; 1474 while ((from_ssid < to_ssid) || 1475 ((from_ssid == to_ssid) && (from <= to))) { 1476 set_bit(from, devs_no_auto[from_ssid]); 1477 from++; 1478 if (from > __MAX_SUBCHANNEL) { 1479 from_ssid++; 1480 from = 0; 1481 } 1482 } 1483 } 1484 } 1485 1486 static int __init virtio_ccw_init(void) 1487 { 1488 /* parse no_auto string before we do anything further */ 1489 no_auto_parse(); 1490 return ccw_driver_register(&virtio_ccw_driver); 1491 } 1492 device_initcall(virtio_ccw_init); 1493