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 int virtio_ccw_finalize_features(struct virtio_device *vdev) 773 { 774 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 775 struct virtio_feature_desc *features; 776 struct ccw1 *ccw; 777 int ret; 778 779 if (vcdev->revision >= 1 && 780 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { 781 dev_err(&vdev->dev, "virtio: device uses revision 1 " 782 "but does not have VIRTIO_F_VERSION_1\n"); 783 return -EINVAL; 784 } 785 786 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 787 if (!ccw) 788 return -ENOMEM; 789 790 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL); 791 if (!features) { 792 ret = -ENOMEM; 793 goto out_free; 794 } 795 /* Give virtio_ring a chance to accept features. */ 796 vring_transport_features(vdev); 797 798 features->index = 0; 799 features->features = cpu_to_le32((u32)vdev->features); 800 /* Write the first half of the feature bits to the host. */ 801 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 802 ccw->flags = 0; 803 ccw->count = sizeof(*features); 804 ccw->cda = (__u32)(unsigned long)features; 805 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 806 if (ret) 807 goto out_free; 808 809 if (vcdev->revision == 0) 810 goto out_free; 811 812 features->index = 1; 813 features->features = cpu_to_le32(vdev->features >> 32); 814 /* Write the second 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); 820 821 out_free: 822 kfree(features); 823 kfree(ccw); 824 825 return ret; 826 } 827 828 static void virtio_ccw_get_config(struct virtio_device *vdev, 829 unsigned int offset, void *buf, unsigned len) 830 { 831 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 832 int ret; 833 struct ccw1 *ccw; 834 void *config_area; 835 unsigned long flags; 836 837 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 838 if (!ccw) 839 return; 840 841 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL); 842 if (!config_area) 843 goto out_free; 844 845 /* Read the config area from the host. */ 846 ccw->cmd_code = CCW_CMD_READ_CONF; 847 ccw->flags = 0; 848 ccw->count = offset + len; 849 ccw->cda = (__u32)(unsigned long)config_area; 850 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG); 851 if (ret) 852 goto out_free; 853 854 spin_lock_irqsave(&vcdev->lock, flags); 855 memcpy(vcdev->config, config_area, offset + len); 856 if (vcdev->config_ready < offset + len) 857 vcdev->config_ready = offset + len; 858 spin_unlock_irqrestore(&vcdev->lock, flags); 859 if (buf) 860 memcpy(buf, config_area + offset, len); 861 862 out_free: 863 kfree(config_area); 864 kfree(ccw); 865 } 866 867 static void virtio_ccw_set_config(struct virtio_device *vdev, 868 unsigned int offset, const void *buf, 869 unsigned len) 870 { 871 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 872 struct ccw1 *ccw; 873 void *config_area; 874 unsigned long flags; 875 876 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 877 if (!ccw) 878 return; 879 880 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL); 881 if (!config_area) 882 goto out_free; 883 884 /* Make sure we don't overwrite fields. */ 885 if (vcdev->config_ready < offset) 886 virtio_ccw_get_config(vdev, 0, NULL, offset); 887 spin_lock_irqsave(&vcdev->lock, flags); 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 spin_unlock_irqrestore(&vcdev->lock, flags); 892 ccw->cmd_code = CCW_CMD_WRITE_CONF; 893 ccw->flags = 0; 894 ccw->count = offset + len; 895 ccw->cda = (__u32)(unsigned long)config_area; 896 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG); 897 898 out_free: 899 kfree(config_area); 900 kfree(ccw); 901 } 902 903 static u8 virtio_ccw_get_status(struct virtio_device *vdev) 904 { 905 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 906 u8 old_status = *vcdev->status; 907 struct ccw1 *ccw; 908 909 if (vcdev->revision < 1) 910 return *vcdev->status; 911 912 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 913 if (!ccw) 914 return old_status; 915 916 ccw->cmd_code = CCW_CMD_READ_STATUS; 917 ccw->flags = 0; 918 ccw->count = sizeof(*vcdev->status); 919 ccw->cda = (__u32)(unsigned long)vcdev->status; 920 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS); 921 /* 922 * If the channel program failed (should only happen if the device 923 * was hotunplugged, and then we clean up via the machine check 924 * handler anyway), vcdev->status was not overwritten and we just 925 * return the old status, which is fine. 926 */ 927 kfree(ccw); 928 929 return *vcdev->status; 930 } 931 932 static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status) 933 { 934 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 935 u8 old_status = *vcdev->status; 936 struct ccw1 *ccw; 937 int ret; 938 939 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 940 if (!ccw) 941 return; 942 943 /* Write the status to the host. */ 944 *vcdev->status = status; 945 ccw->cmd_code = CCW_CMD_WRITE_STATUS; 946 ccw->flags = 0; 947 ccw->count = sizeof(status); 948 ccw->cda = (__u32)(unsigned long)vcdev->status; 949 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS); 950 /* Write failed? We assume status is unchanged. */ 951 if (ret) 952 *vcdev->status = old_status; 953 kfree(ccw); 954 } 955 956 static const struct virtio_config_ops virtio_ccw_config_ops = { 957 .get_features = virtio_ccw_get_features, 958 .finalize_features = virtio_ccw_finalize_features, 959 .get = virtio_ccw_get_config, 960 .set = virtio_ccw_set_config, 961 .get_status = virtio_ccw_get_status, 962 .set_status = virtio_ccw_set_status, 963 .reset = virtio_ccw_reset, 964 .find_vqs = virtio_ccw_find_vqs, 965 .del_vqs = virtio_ccw_del_vqs, 966 }; 967 968 969 /* 970 * ccw bus driver related functions 971 */ 972 973 static void virtio_ccw_release_dev(struct device *_d) 974 { 975 struct virtio_device *dev = dev_to_virtio(_d); 976 struct virtio_ccw_device *vcdev = to_vc_device(dev); 977 978 kfree(vcdev->status); 979 kfree(vcdev->config_block); 980 kfree(vcdev); 981 } 982 983 static int irb_is_error(struct irb *irb) 984 { 985 if (scsw_cstat(&irb->scsw) != 0) 986 return 1; 987 if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) 988 return 1; 989 if (scsw_cc(&irb->scsw) != 0) 990 return 1; 991 return 0; 992 } 993 994 static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev, 995 int index) 996 { 997 struct virtio_ccw_vq_info *info; 998 unsigned long flags; 999 struct virtqueue *vq; 1000 1001 vq = NULL; 1002 spin_lock_irqsave(&vcdev->lock, flags); 1003 list_for_each_entry(info, &vcdev->virtqueues, node) { 1004 if (info->vq->index == index) { 1005 vq = info->vq; 1006 break; 1007 } 1008 } 1009 spin_unlock_irqrestore(&vcdev->lock, flags); 1010 return vq; 1011 } 1012 1013 static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev, 1014 __u32 activity) 1015 { 1016 if (vcdev->curr_io & activity) { 1017 switch (activity) { 1018 case VIRTIO_CCW_DOING_READ_FEAT: 1019 case VIRTIO_CCW_DOING_WRITE_FEAT: 1020 case VIRTIO_CCW_DOING_READ_CONFIG: 1021 case VIRTIO_CCW_DOING_WRITE_CONFIG: 1022 case VIRTIO_CCW_DOING_WRITE_STATUS: 1023 case VIRTIO_CCW_DOING_READ_STATUS: 1024 case VIRTIO_CCW_DOING_SET_VQ: 1025 case VIRTIO_CCW_DOING_SET_IND: 1026 case VIRTIO_CCW_DOING_SET_CONF_IND: 1027 case VIRTIO_CCW_DOING_RESET: 1028 case VIRTIO_CCW_DOING_READ_VQ_CONF: 1029 case VIRTIO_CCW_DOING_SET_IND_ADAPTER: 1030 case VIRTIO_CCW_DOING_SET_VIRTIO_REV: 1031 vcdev->curr_io &= ~activity; 1032 wake_up(&vcdev->wait_q); 1033 break; 1034 default: 1035 /* don't know what to do... */ 1036 dev_warn(&vcdev->cdev->dev, 1037 "Suspicious activity '%08x'\n", activity); 1038 WARN_ON(1); 1039 break; 1040 } 1041 } 1042 } 1043 1044 static void virtio_ccw_int_handler(struct ccw_device *cdev, 1045 unsigned long intparm, 1046 struct irb *irb) 1047 { 1048 __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK; 1049 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1050 int i; 1051 struct virtqueue *vq; 1052 1053 if (!vcdev) 1054 return; 1055 if (IS_ERR(irb)) { 1056 vcdev->err = PTR_ERR(irb); 1057 virtio_ccw_check_activity(vcdev, activity); 1058 /* Don't poke around indicators, something's wrong. */ 1059 return; 1060 } 1061 /* Check if it's a notification from the host. */ 1062 if ((intparm == 0) && 1063 (scsw_stctl(&irb->scsw) == 1064 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) { 1065 /* OK */ 1066 } 1067 if (irb_is_error(irb)) { 1068 /* Command reject? */ 1069 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) && 1070 (irb->ecw[0] & SNS0_CMD_REJECT)) 1071 vcdev->err = -EOPNOTSUPP; 1072 else 1073 /* Map everything else to -EIO. */ 1074 vcdev->err = -EIO; 1075 } 1076 virtio_ccw_check_activity(vcdev, activity); 1077 for_each_set_bit(i, &vcdev->indicators, 1078 sizeof(vcdev->indicators) * BITS_PER_BYTE) { 1079 /* The bit clear must happen before the vring kick. */ 1080 clear_bit(i, &vcdev->indicators); 1081 barrier(); 1082 vq = virtio_ccw_vq_by_ind(vcdev, i); 1083 vring_interrupt(0, vq); 1084 } 1085 if (test_bit(0, &vcdev->indicators2)) { 1086 virtio_config_changed(&vcdev->vdev); 1087 clear_bit(0, &vcdev->indicators2); 1088 } 1089 } 1090 1091 /* 1092 * We usually want to autoonline all devices, but give the admin 1093 * a way to exempt devices from this. 1094 */ 1095 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ 1096 (8*sizeof(long))) 1097 static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS]; 1098 1099 static char *no_auto = ""; 1100 1101 module_param(no_auto, charp, 0444); 1102 MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined"); 1103 1104 static int virtio_ccw_check_autoonline(struct ccw_device *cdev) 1105 { 1106 struct ccw_dev_id id; 1107 1108 ccw_device_get_id(cdev, &id); 1109 if (test_bit(id.devno, devs_no_auto[id.ssid])) 1110 return 0; 1111 return 1; 1112 } 1113 1114 static void virtio_ccw_auto_online(void *data, async_cookie_t cookie) 1115 { 1116 struct ccw_device *cdev = data; 1117 int ret; 1118 1119 ret = ccw_device_set_online(cdev); 1120 if (ret) 1121 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret); 1122 } 1123 1124 static int virtio_ccw_probe(struct ccw_device *cdev) 1125 { 1126 cdev->handler = virtio_ccw_int_handler; 1127 1128 if (virtio_ccw_check_autoonline(cdev)) 1129 async_schedule(virtio_ccw_auto_online, cdev); 1130 return 0; 1131 } 1132 1133 static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev) 1134 { 1135 unsigned long flags; 1136 struct virtio_ccw_device *vcdev; 1137 1138 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1139 vcdev = dev_get_drvdata(&cdev->dev); 1140 if (!vcdev || vcdev->going_away) { 1141 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1142 return NULL; 1143 } 1144 vcdev->going_away = true; 1145 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1146 return vcdev; 1147 } 1148 1149 static void virtio_ccw_remove(struct ccw_device *cdev) 1150 { 1151 unsigned long flags; 1152 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1153 1154 if (vcdev && cdev->online) { 1155 if (vcdev->device_lost) 1156 virtio_break_device(&vcdev->vdev); 1157 unregister_virtio_device(&vcdev->vdev); 1158 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1159 dev_set_drvdata(&cdev->dev, NULL); 1160 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1161 } 1162 cdev->handler = NULL; 1163 } 1164 1165 static int virtio_ccw_offline(struct ccw_device *cdev) 1166 { 1167 unsigned long flags; 1168 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1169 1170 if (!vcdev) 1171 return 0; 1172 if (vcdev->device_lost) 1173 virtio_break_device(&vcdev->vdev); 1174 unregister_virtio_device(&vcdev->vdev); 1175 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1176 dev_set_drvdata(&cdev->dev, NULL); 1177 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1178 return 0; 1179 } 1180 1181 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev) 1182 { 1183 struct virtio_rev_info *rev; 1184 struct ccw1 *ccw; 1185 int ret; 1186 1187 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 1188 if (!ccw) 1189 return -ENOMEM; 1190 rev = kzalloc(sizeof(*rev), GFP_DMA | GFP_KERNEL); 1191 if (!rev) { 1192 kfree(ccw); 1193 return -ENOMEM; 1194 } 1195 1196 /* Set transport revision */ 1197 ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV; 1198 ccw->flags = 0; 1199 ccw->count = sizeof(*rev); 1200 ccw->cda = (__u32)(unsigned long)rev; 1201 1202 vcdev->revision = VIRTIO_CCW_REV_MAX; 1203 do { 1204 rev->revision = vcdev->revision; 1205 /* none of our supported revisions carry payload */ 1206 rev->length = 0; 1207 ret = ccw_io_helper(vcdev, ccw, 1208 VIRTIO_CCW_DOING_SET_VIRTIO_REV); 1209 if (ret == -EOPNOTSUPP) { 1210 if (vcdev->revision == 0) 1211 /* 1212 * The host device does not support setting 1213 * the revision: let's operate it in legacy 1214 * mode. 1215 */ 1216 ret = 0; 1217 else 1218 vcdev->revision--; 1219 } 1220 } while (ret == -EOPNOTSUPP); 1221 1222 kfree(ccw); 1223 kfree(rev); 1224 return ret; 1225 } 1226 1227 static int virtio_ccw_online(struct ccw_device *cdev) 1228 { 1229 int ret; 1230 struct virtio_ccw_device *vcdev; 1231 unsigned long flags; 1232 1233 vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL); 1234 if (!vcdev) { 1235 dev_warn(&cdev->dev, "Could not get memory for virtio\n"); 1236 ret = -ENOMEM; 1237 goto out_free; 1238 } 1239 vcdev->config_block = kzalloc(sizeof(*vcdev->config_block), 1240 GFP_DMA | GFP_KERNEL); 1241 if (!vcdev->config_block) { 1242 ret = -ENOMEM; 1243 goto out_free; 1244 } 1245 vcdev->status = kzalloc(sizeof(*vcdev->status), GFP_DMA | GFP_KERNEL); 1246 if (!vcdev->status) { 1247 ret = -ENOMEM; 1248 goto out_free; 1249 } 1250 1251 vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */ 1252 1253 vcdev->vdev.dev.parent = &cdev->dev; 1254 vcdev->vdev.dev.release = virtio_ccw_release_dev; 1255 vcdev->vdev.config = &virtio_ccw_config_ops; 1256 vcdev->cdev = cdev; 1257 init_waitqueue_head(&vcdev->wait_q); 1258 INIT_LIST_HEAD(&vcdev->virtqueues); 1259 spin_lock_init(&vcdev->lock); 1260 mutex_init(&vcdev->io_lock); 1261 1262 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1263 dev_set_drvdata(&cdev->dev, vcdev); 1264 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1265 vcdev->vdev.id.vendor = cdev->id.cu_type; 1266 vcdev->vdev.id.device = cdev->id.cu_model; 1267 1268 ret = virtio_ccw_set_transport_rev(vcdev); 1269 if (ret) 1270 goto out_free; 1271 1272 ret = register_virtio_device(&vcdev->vdev); 1273 if (ret) { 1274 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n", 1275 ret); 1276 goto out_put; 1277 } 1278 return 0; 1279 out_put: 1280 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1281 dev_set_drvdata(&cdev->dev, NULL); 1282 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1283 put_device(&vcdev->vdev.dev); 1284 return ret; 1285 out_free: 1286 if (vcdev) { 1287 kfree(vcdev->status); 1288 kfree(vcdev->config_block); 1289 } 1290 kfree(vcdev); 1291 return ret; 1292 } 1293 1294 static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event) 1295 { 1296 int rc; 1297 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1298 1299 /* 1300 * Make sure vcdev is set 1301 * i.e. set_offline/remove callback not already running 1302 */ 1303 if (!vcdev) 1304 return NOTIFY_DONE; 1305 1306 switch (event) { 1307 case CIO_GONE: 1308 vcdev->device_lost = true; 1309 rc = NOTIFY_DONE; 1310 break; 1311 case CIO_OPER: 1312 rc = NOTIFY_OK; 1313 break; 1314 default: 1315 rc = NOTIFY_DONE; 1316 break; 1317 } 1318 return rc; 1319 } 1320 1321 static struct ccw_device_id virtio_ids[] = { 1322 { CCW_DEVICE(0x3832, 0) }, 1323 {}, 1324 }; 1325 1326 #ifdef CONFIG_PM_SLEEP 1327 static int virtio_ccw_freeze(struct ccw_device *cdev) 1328 { 1329 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1330 1331 return virtio_device_freeze(&vcdev->vdev); 1332 } 1333 1334 static int virtio_ccw_restore(struct ccw_device *cdev) 1335 { 1336 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1337 int ret; 1338 1339 ret = virtio_ccw_set_transport_rev(vcdev); 1340 if (ret) 1341 return ret; 1342 1343 return virtio_device_restore(&vcdev->vdev); 1344 } 1345 #endif 1346 1347 static struct ccw_driver virtio_ccw_driver = { 1348 .driver = { 1349 .owner = THIS_MODULE, 1350 .name = "virtio_ccw", 1351 }, 1352 .ids = virtio_ids, 1353 .probe = virtio_ccw_probe, 1354 .remove = virtio_ccw_remove, 1355 .set_offline = virtio_ccw_offline, 1356 .set_online = virtio_ccw_online, 1357 .notify = virtio_ccw_cio_notify, 1358 .int_class = IRQIO_VIR, 1359 #ifdef CONFIG_PM_SLEEP 1360 .freeze = virtio_ccw_freeze, 1361 .thaw = virtio_ccw_restore, 1362 .restore = virtio_ccw_restore, 1363 #endif 1364 }; 1365 1366 static int __init pure_hex(char **cp, unsigned int *val, int min_digit, 1367 int max_digit, int max_val) 1368 { 1369 int diff; 1370 1371 diff = 0; 1372 *val = 0; 1373 1374 while (diff <= max_digit) { 1375 int value = hex_to_bin(**cp); 1376 1377 if (value < 0) 1378 break; 1379 *val = *val * 16 + value; 1380 (*cp)++; 1381 diff++; 1382 } 1383 1384 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) 1385 return 1; 1386 1387 return 0; 1388 } 1389 1390 static int __init parse_busid(char *str, unsigned int *cssid, 1391 unsigned int *ssid, unsigned int *devno) 1392 { 1393 char *str_work; 1394 int rc, ret; 1395 1396 rc = 1; 1397 1398 if (*str == '\0') 1399 goto out; 1400 1401 str_work = str; 1402 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); 1403 if (ret || (str_work[0] != '.')) 1404 goto out; 1405 str_work++; 1406 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); 1407 if (ret || (str_work[0] != '.')) 1408 goto out; 1409 str_work++; 1410 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); 1411 if (ret || (str_work[0] != '\0')) 1412 goto out; 1413 1414 rc = 0; 1415 out: 1416 return rc; 1417 } 1418 1419 static void __init no_auto_parse(void) 1420 { 1421 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; 1422 char *parm, *str; 1423 int rc; 1424 1425 str = no_auto; 1426 while ((parm = strsep(&str, ","))) { 1427 rc = parse_busid(strsep(&parm, "-"), &from_cssid, 1428 &from_ssid, &from); 1429 if (rc) 1430 continue; 1431 if (parm != NULL) { 1432 rc = parse_busid(parm, &to_cssid, 1433 &to_ssid, &to); 1434 if ((from_ssid > to_ssid) || 1435 ((from_ssid == to_ssid) && (from > to))) 1436 rc = -EINVAL; 1437 } else { 1438 to_cssid = from_cssid; 1439 to_ssid = from_ssid; 1440 to = from; 1441 } 1442 if (rc) 1443 continue; 1444 while ((from_ssid < to_ssid) || 1445 ((from_ssid == to_ssid) && (from <= to))) { 1446 set_bit(from, devs_no_auto[from_ssid]); 1447 from++; 1448 if (from > __MAX_SUBCHANNEL) { 1449 from_ssid++; 1450 from = 0; 1451 } 1452 } 1453 } 1454 } 1455 1456 static int __init virtio_ccw_init(void) 1457 { 1458 /* parse no_auto string before we do anything further */ 1459 no_auto_parse(); 1460 return ccw_driver_register(&virtio_ccw_driver); 1461 } 1462 device_initcall(virtio_ccw_init); 1463