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, queue_idx = 0; 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 if (!names[i]) { 647 vqs[i] = NULL; 648 continue; 649 } 650 651 vqs[i] = virtio_ccw_setup_vq(vdev, queue_idx++, callbacks[i], 652 names[i], ctx ? ctx[i] : false, 653 ccw); 654 if (IS_ERR(vqs[i])) { 655 ret = PTR_ERR(vqs[i]); 656 vqs[i] = NULL; 657 goto out; 658 } 659 } 660 ret = -ENOMEM; 661 /* 662 * We need a data area under 2G to communicate. Our payload is 663 * the address of the indicators. 664 */ 665 indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL); 666 if (!indicatorp) 667 goto out; 668 *indicatorp = (unsigned long) &vcdev->indicators; 669 if (vcdev->is_thinint) { 670 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw); 671 if (ret) 672 /* no error, just fall back to legacy interrupts */ 673 vcdev->is_thinint = false; 674 } 675 if (!vcdev->is_thinint) { 676 /* Register queue indicators with host. */ 677 vcdev->indicators = 0; 678 ccw->cmd_code = CCW_CMD_SET_IND; 679 ccw->flags = 0; 680 ccw->count = sizeof(&vcdev->indicators); 681 ccw->cda = (__u32)(unsigned long) indicatorp; 682 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND); 683 if (ret) 684 goto out; 685 } 686 /* Register indicators2 with host for config changes */ 687 *indicatorp = (unsigned long) &vcdev->indicators2; 688 vcdev->indicators2 = 0; 689 ccw->cmd_code = CCW_CMD_SET_CONF_IND; 690 ccw->flags = 0; 691 ccw->count = sizeof(&vcdev->indicators2); 692 ccw->cda = (__u32)(unsigned long) indicatorp; 693 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND); 694 if (ret) 695 goto out; 696 697 kfree(indicatorp); 698 kfree(ccw); 699 return 0; 700 out: 701 kfree(indicatorp); 702 kfree(ccw); 703 virtio_ccw_del_vqs(vdev); 704 return ret; 705 } 706 707 static void virtio_ccw_reset(struct virtio_device *vdev) 708 { 709 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 710 struct ccw1 *ccw; 711 712 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 713 if (!ccw) 714 return; 715 716 /* Zero status bits. */ 717 *vcdev->status = 0; 718 719 /* Send a reset ccw on device. */ 720 ccw->cmd_code = CCW_CMD_VDEV_RESET; 721 ccw->flags = 0; 722 ccw->count = 0; 723 ccw->cda = 0; 724 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET); 725 kfree(ccw); 726 } 727 728 static u64 virtio_ccw_get_features(struct virtio_device *vdev) 729 { 730 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 731 struct virtio_feature_desc *features; 732 int ret; 733 u64 rc; 734 struct ccw1 *ccw; 735 736 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 737 if (!ccw) 738 return 0; 739 740 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL); 741 if (!features) { 742 rc = 0; 743 goto out_free; 744 } 745 /* Read the feature bits from the host. */ 746 features->index = 0; 747 ccw->cmd_code = CCW_CMD_READ_FEAT; 748 ccw->flags = 0; 749 ccw->count = sizeof(*features); 750 ccw->cda = (__u32)(unsigned long)features; 751 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 752 if (ret) { 753 rc = 0; 754 goto out_free; 755 } 756 757 rc = le32_to_cpu(features->features); 758 759 if (vcdev->revision == 0) 760 goto out_free; 761 762 /* Read second half of the feature bits from the host. */ 763 features->index = 1; 764 ccw->cmd_code = CCW_CMD_READ_FEAT; 765 ccw->flags = 0; 766 ccw->count = sizeof(*features); 767 ccw->cda = (__u32)(unsigned long)features; 768 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 769 if (ret == 0) 770 rc |= (u64)le32_to_cpu(features->features) << 32; 771 772 out_free: 773 kfree(features); 774 kfree(ccw); 775 return rc; 776 } 777 778 static void ccw_transport_features(struct virtio_device *vdev) 779 { 780 /* 781 * Packed ring isn't enabled on virtio_ccw for now, 782 * because virtio_ccw uses some legacy accessors, 783 * e.g. virtqueue_get_avail() and virtqueue_get_used() 784 * which aren't available in packed ring currently. 785 */ 786 __virtio_clear_bit(vdev, VIRTIO_F_RING_PACKED); 787 } 788 789 static int virtio_ccw_finalize_features(struct virtio_device *vdev) 790 { 791 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 792 struct virtio_feature_desc *features; 793 struct ccw1 *ccw; 794 int ret; 795 796 if (vcdev->revision >= 1 && 797 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { 798 dev_err(&vdev->dev, "virtio: device uses revision 1 " 799 "but does not have VIRTIO_F_VERSION_1\n"); 800 return -EINVAL; 801 } 802 803 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 804 if (!ccw) 805 return -ENOMEM; 806 807 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL); 808 if (!features) { 809 ret = -ENOMEM; 810 goto out_free; 811 } 812 /* Give virtio_ring a chance to accept features. */ 813 vring_transport_features(vdev); 814 815 /* Give virtio_ccw a chance to accept features. */ 816 ccw_transport_features(vdev); 817 818 features->index = 0; 819 features->features = cpu_to_le32((u32)vdev->features); 820 /* Write the first half of the feature bits to the host. */ 821 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 822 ccw->flags = 0; 823 ccw->count = sizeof(*features); 824 ccw->cda = (__u32)(unsigned long)features; 825 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 826 if (ret) 827 goto out_free; 828 829 if (vcdev->revision == 0) 830 goto out_free; 831 832 features->index = 1; 833 features->features = cpu_to_le32(vdev->features >> 32); 834 /* Write the second half of the feature bits to the host. */ 835 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 836 ccw->flags = 0; 837 ccw->count = sizeof(*features); 838 ccw->cda = (__u32)(unsigned long)features; 839 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 840 841 out_free: 842 kfree(features); 843 kfree(ccw); 844 845 return ret; 846 } 847 848 static void virtio_ccw_get_config(struct virtio_device *vdev, 849 unsigned int offset, void *buf, unsigned len) 850 { 851 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 852 int ret; 853 struct ccw1 *ccw; 854 void *config_area; 855 unsigned long flags; 856 857 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 858 if (!ccw) 859 return; 860 861 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL); 862 if (!config_area) 863 goto out_free; 864 865 /* Read the config area from the host. */ 866 ccw->cmd_code = CCW_CMD_READ_CONF; 867 ccw->flags = 0; 868 ccw->count = offset + len; 869 ccw->cda = (__u32)(unsigned long)config_area; 870 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG); 871 if (ret) 872 goto out_free; 873 874 spin_lock_irqsave(&vcdev->lock, flags); 875 memcpy(vcdev->config, config_area, offset + len); 876 if (vcdev->config_ready < offset + len) 877 vcdev->config_ready = offset + len; 878 spin_unlock_irqrestore(&vcdev->lock, flags); 879 if (buf) 880 memcpy(buf, config_area + offset, len); 881 882 out_free: 883 kfree(config_area); 884 kfree(ccw); 885 } 886 887 static void virtio_ccw_set_config(struct virtio_device *vdev, 888 unsigned int offset, const void *buf, 889 unsigned len) 890 { 891 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 892 struct ccw1 *ccw; 893 void *config_area; 894 unsigned long flags; 895 896 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 897 if (!ccw) 898 return; 899 900 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL); 901 if (!config_area) 902 goto out_free; 903 904 /* Make sure we don't overwrite fields. */ 905 if (vcdev->config_ready < offset) 906 virtio_ccw_get_config(vdev, 0, NULL, offset); 907 spin_lock_irqsave(&vcdev->lock, flags); 908 memcpy(&vcdev->config[offset], buf, len); 909 /* Write the config area to the host. */ 910 memcpy(config_area, vcdev->config, sizeof(vcdev->config)); 911 spin_unlock_irqrestore(&vcdev->lock, flags); 912 ccw->cmd_code = CCW_CMD_WRITE_CONF; 913 ccw->flags = 0; 914 ccw->count = offset + len; 915 ccw->cda = (__u32)(unsigned long)config_area; 916 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG); 917 918 out_free: 919 kfree(config_area); 920 kfree(ccw); 921 } 922 923 static u8 virtio_ccw_get_status(struct virtio_device *vdev) 924 { 925 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 926 u8 old_status = *vcdev->status; 927 struct ccw1 *ccw; 928 929 if (vcdev->revision < 1) 930 return *vcdev->status; 931 932 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 933 if (!ccw) 934 return old_status; 935 936 ccw->cmd_code = CCW_CMD_READ_STATUS; 937 ccw->flags = 0; 938 ccw->count = sizeof(*vcdev->status); 939 ccw->cda = (__u32)(unsigned long)vcdev->status; 940 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS); 941 /* 942 * If the channel program failed (should only happen if the device 943 * was hotunplugged, and then we clean up via the machine check 944 * handler anyway), vcdev->status was not overwritten and we just 945 * return the old status, which is fine. 946 */ 947 kfree(ccw); 948 949 return *vcdev->status; 950 } 951 952 static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status) 953 { 954 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 955 u8 old_status = *vcdev->status; 956 struct ccw1 *ccw; 957 int ret; 958 959 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 960 if (!ccw) 961 return; 962 963 /* Write the status to the host. */ 964 *vcdev->status = status; 965 ccw->cmd_code = CCW_CMD_WRITE_STATUS; 966 ccw->flags = 0; 967 ccw->count = sizeof(status); 968 ccw->cda = (__u32)(unsigned long)vcdev->status; 969 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS); 970 /* Write failed? We assume status is unchanged. */ 971 if (ret) 972 *vcdev->status = old_status; 973 kfree(ccw); 974 } 975 976 static const struct virtio_config_ops virtio_ccw_config_ops = { 977 .get_features = virtio_ccw_get_features, 978 .finalize_features = virtio_ccw_finalize_features, 979 .get = virtio_ccw_get_config, 980 .set = virtio_ccw_set_config, 981 .get_status = virtio_ccw_get_status, 982 .set_status = virtio_ccw_set_status, 983 .reset = virtio_ccw_reset, 984 .find_vqs = virtio_ccw_find_vqs, 985 .del_vqs = virtio_ccw_del_vqs, 986 }; 987 988 989 /* 990 * ccw bus driver related functions 991 */ 992 993 static void virtio_ccw_release_dev(struct device *_d) 994 { 995 struct virtio_device *dev = dev_to_virtio(_d); 996 struct virtio_ccw_device *vcdev = to_vc_device(dev); 997 998 kfree(vcdev->status); 999 kfree(vcdev->config_block); 1000 kfree(vcdev); 1001 } 1002 1003 static int irb_is_error(struct irb *irb) 1004 { 1005 if (scsw_cstat(&irb->scsw) != 0) 1006 return 1; 1007 if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) 1008 return 1; 1009 if (scsw_cc(&irb->scsw) != 0) 1010 return 1; 1011 return 0; 1012 } 1013 1014 static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev, 1015 int index) 1016 { 1017 struct virtio_ccw_vq_info *info; 1018 unsigned long flags; 1019 struct virtqueue *vq; 1020 1021 vq = NULL; 1022 spin_lock_irqsave(&vcdev->lock, flags); 1023 list_for_each_entry(info, &vcdev->virtqueues, node) { 1024 if (info->vq->index == index) { 1025 vq = info->vq; 1026 break; 1027 } 1028 } 1029 spin_unlock_irqrestore(&vcdev->lock, flags); 1030 return vq; 1031 } 1032 1033 static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev, 1034 __u32 activity) 1035 { 1036 if (vcdev->curr_io & activity) { 1037 switch (activity) { 1038 case VIRTIO_CCW_DOING_READ_FEAT: 1039 case VIRTIO_CCW_DOING_WRITE_FEAT: 1040 case VIRTIO_CCW_DOING_READ_CONFIG: 1041 case VIRTIO_CCW_DOING_WRITE_CONFIG: 1042 case VIRTIO_CCW_DOING_WRITE_STATUS: 1043 case VIRTIO_CCW_DOING_READ_STATUS: 1044 case VIRTIO_CCW_DOING_SET_VQ: 1045 case VIRTIO_CCW_DOING_SET_IND: 1046 case VIRTIO_CCW_DOING_SET_CONF_IND: 1047 case VIRTIO_CCW_DOING_RESET: 1048 case VIRTIO_CCW_DOING_READ_VQ_CONF: 1049 case VIRTIO_CCW_DOING_SET_IND_ADAPTER: 1050 case VIRTIO_CCW_DOING_SET_VIRTIO_REV: 1051 vcdev->curr_io &= ~activity; 1052 wake_up(&vcdev->wait_q); 1053 break; 1054 default: 1055 /* don't know what to do... */ 1056 dev_warn(&vcdev->cdev->dev, 1057 "Suspicious activity '%08x'\n", activity); 1058 WARN_ON(1); 1059 break; 1060 } 1061 } 1062 } 1063 1064 static void virtio_ccw_int_handler(struct ccw_device *cdev, 1065 unsigned long intparm, 1066 struct irb *irb) 1067 { 1068 __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK; 1069 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1070 int i; 1071 struct virtqueue *vq; 1072 1073 if (!vcdev) 1074 return; 1075 if (IS_ERR(irb)) { 1076 vcdev->err = PTR_ERR(irb); 1077 virtio_ccw_check_activity(vcdev, activity); 1078 /* Don't poke around indicators, something's wrong. */ 1079 return; 1080 } 1081 /* Check if it's a notification from the host. */ 1082 if ((intparm == 0) && 1083 (scsw_stctl(&irb->scsw) == 1084 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) { 1085 /* OK */ 1086 } 1087 if (irb_is_error(irb)) { 1088 /* Command reject? */ 1089 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) && 1090 (irb->ecw[0] & SNS0_CMD_REJECT)) 1091 vcdev->err = -EOPNOTSUPP; 1092 else 1093 /* Map everything else to -EIO. */ 1094 vcdev->err = -EIO; 1095 } 1096 virtio_ccw_check_activity(vcdev, activity); 1097 for_each_set_bit(i, &vcdev->indicators, 1098 sizeof(vcdev->indicators) * BITS_PER_BYTE) { 1099 /* The bit clear must happen before the vring kick. */ 1100 clear_bit(i, &vcdev->indicators); 1101 barrier(); 1102 vq = virtio_ccw_vq_by_ind(vcdev, i); 1103 vring_interrupt(0, vq); 1104 } 1105 if (test_bit(0, &vcdev->indicators2)) { 1106 virtio_config_changed(&vcdev->vdev); 1107 clear_bit(0, &vcdev->indicators2); 1108 } 1109 } 1110 1111 /* 1112 * We usually want to autoonline all devices, but give the admin 1113 * a way to exempt devices from this. 1114 */ 1115 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ 1116 (8*sizeof(long))) 1117 static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS]; 1118 1119 static char *no_auto = ""; 1120 1121 module_param(no_auto, charp, 0444); 1122 MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined"); 1123 1124 static int virtio_ccw_check_autoonline(struct ccw_device *cdev) 1125 { 1126 struct ccw_dev_id id; 1127 1128 ccw_device_get_id(cdev, &id); 1129 if (test_bit(id.devno, devs_no_auto[id.ssid])) 1130 return 0; 1131 return 1; 1132 } 1133 1134 static void virtio_ccw_auto_online(void *data, async_cookie_t cookie) 1135 { 1136 struct ccw_device *cdev = data; 1137 int ret; 1138 1139 ret = ccw_device_set_online(cdev); 1140 if (ret) 1141 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret); 1142 } 1143 1144 static int virtio_ccw_probe(struct ccw_device *cdev) 1145 { 1146 cdev->handler = virtio_ccw_int_handler; 1147 1148 if (virtio_ccw_check_autoonline(cdev)) 1149 async_schedule(virtio_ccw_auto_online, cdev); 1150 return 0; 1151 } 1152 1153 static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev) 1154 { 1155 unsigned long flags; 1156 struct virtio_ccw_device *vcdev; 1157 1158 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1159 vcdev = dev_get_drvdata(&cdev->dev); 1160 if (!vcdev || vcdev->going_away) { 1161 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1162 return NULL; 1163 } 1164 vcdev->going_away = true; 1165 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1166 return vcdev; 1167 } 1168 1169 static void virtio_ccw_remove(struct ccw_device *cdev) 1170 { 1171 unsigned long flags; 1172 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1173 1174 if (vcdev && cdev->online) { 1175 if (vcdev->device_lost) 1176 virtio_break_device(&vcdev->vdev); 1177 unregister_virtio_device(&vcdev->vdev); 1178 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1179 dev_set_drvdata(&cdev->dev, NULL); 1180 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1181 } 1182 cdev->handler = NULL; 1183 } 1184 1185 static int virtio_ccw_offline(struct ccw_device *cdev) 1186 { 1187 unsigned long flags; 1188 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1189 1190 if (!vcdev) 1191 return 0; 1192 if (vcdev->device_lost) 1193 virtio_break_device(&vcdev->vdev); 1194 unregister_virtio_device(&vcdev->vdev); 1195 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1196 dev_set_drvdata(&cdev->dev, NULL); 1197 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1198 return 0; 1199 } 1200 1201 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev) 1202 { 1203 struct virtio_rev_info *rev; 1204 struct ccw1 *ccw; 1205 int ret; 1206 1207 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 1208 if (!ccw) 1209 return -ENOMEM; 1210 rev = kzalloc(sizeof(*rev), GFP_DMA | GFP_KERNEL); 1211 if (!rev) { 1212 kfree(ccw); 1213 return -ENOMEM; 1214 } 1215 1216 /* Set transport revision */ 1217 ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV; 1218 ccw->flags = 0; 1219 ccw->count = sizeof(*rev); 1220 ccw->cda = (__u32)(unsigned long)rev; 1221 1222 vcdev->revision = VIRTIO_CCW_REV_MAX; 1223 do { 1224 rev->revision = vcdev->revision; 1225 /* none of our supported revisions carry payload */ 1226 rev->length = 0; 1227 ret = ccw_io_helper(vcdev, ccw, 1228 VIRTIO_CCW_DOING_SET_VIRTIO_REV); 1229 if (ret == -EOPNOTSUPP) { 1230 if (vcdev->revision == 0) 1231 /* 1232 * The host device does not support setting 1233 * the revision: let's operate it in legacy 1234 * mode. 1235 */ 1236 ret = 0; 1237 else 1238 vcdev->revision--; 1239 } 1240 } while (ret == -EOPNOTSUPP); 1241 1242 kfree(ccw); 1243 kfree(rev); 1244 return ret; 1245 } 1246 1247 static int virtio_ccw_online(struct ccw_device *cdev) 1248 { 1249 int ret; 1250 struct virtio_ccw_device *vcdev; 1251 unsigned long flags; 1252 1253 vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL); 1254 if (!vcdev) { 1255 dev_warn(&cdev->dev, "Could not get memory for virtio\n"); 1256 ret = -ENOMEM; 1257 goto out_free; 1258 } 1259 vcdev->config_block = kzalloc(sizeof(*vcdev->config_block), 1260 GFP_DMA | GFP_KERNEL); 1261 if (!vcdev->config_block) { 1262 ret = -ENOMEM; 1263 goto out_free; 1264 } 1265 vcdev->status = kzalloc(sizeof(*vcdev->status), GFP_DMA | GFP_KERNEL); 1266 if (!vcdev->status) { 1267 ret = -ENOMEM; 1268 goto out_free; 1269 } 1270 1271 vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */ 1272 1273 vcdev->vdev.dev.parent = &cdev->dev; 1274 vcdev->vdev.dev.release = virtio_ccw_release_dev; 1275 vcdev->vdev.config = &virtio_ccw_config_ops; 1276 vcdev->cdev = cdev; 1277 init_waitqueue_head(&vcdev->wait_q); 1278 INIT_LIST_HEAD(&vcdev->virtqueues); 1279 spin_lock_init(&vcdev->lock); 1280 mutex_init(&vcdev->io_lock); 1281 1282 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1283 dev_set_drvdata(&cdev->dev, vcdev); 1284 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1285 vcdev->vdev.id.vendor = cdev->id.cu_type; 1286 vcdev->vdev.id.device = cdev->id.cu_model; 1287 1288 ret = virtio_ccw_set_transport_rev(vcdev); 1289 if (ret) 1290 goto out_free; 1291 1292 ret = register_virtio_device(&vcdev->vdev); 1293 if (ret) { 1294 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n", 1295 ret); 1296 goto out_put; 1297 } 1298 return 0; 1299 out_put: 1300 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1301 dev_set_drvdata(&cdev->dev, NULL); 1302 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1303 put_device(&vcdev->vdev.dev); 1304 return ret; 1305 out_free: 1306 if (vcdev) { 1307 kfree(vcdev->status); 1308 kfree(vcdev->config_block); 1309 } 1310 kfree(vcdev); 1311 return ret; 1312 } 1313 1314 static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event) 1315 { 1316 int rc; 1317 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1318 1319 /* 1320 * Make sure vcdev is set 1321 * i.e. set_offline/remove callback not already running 1322 */ 1323 if (!vcdev) 1324 return NOTIFY_DONE; 1325 1326 switch (event) { 1327 case CIO_GONE: 1328 vcdev->device_lost = true; 1329 rc = NOTIFY_DONE; 1330 break; 1331 case CIO_OPER: 1332 rc = NOTIFY_OK; 1333 break; 1334 default: 1335 rc = NOTIFY_DONE; 1336 break; 1337 } 1338 return rc; 1339 } 1340 1341 static struct ccw_device_id virtio_ids[] = { 1342 { CCW_DEVICE(0x3832, 0) }, 1343 {}, 1344 }; 1345 1346 #ifdef CONFIG_PM_SLEEP 1347 static int virtio_ccw_freeze(struct ccw_device *cdev) 1348 { 1349 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1350 1351 return virtio_device_freeze(&vcdev->vdev); 1352 } 1353 1354 static int virtio_ccw_restore(struct ccw_device *cdev) 1355 { 1356 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1357 int ret; 1358 1359 ret = virtio_ccw_set_transport_rev(vcdev); 1360 if (ret) 1361 return ret; 1362 1363 return virtio_device_restore(&vcdev->vdev); 1364 } 1365 #endif 1366 1367 static struct ccw_driver virtio_ccw_driver = { 1368 .driver = { 1369 .owner = THIS_MODULE, 1370 .name = "virtio_ccw", 1371 }, 1372 .ids = virtio_ids, 1373 .probe = virtio_ccw_probe, 1374 .remove = virtio_ccw_remove, 1375 .set_offline = virtio_ccw_offline, 1376 .set_online = virtio_ccw_online, 1377 .notify = virtio_ccw_cio_notify, 1378 .int_class = IRQIO_VIR, 1379 #ifdef CONFIG_PM_SLEEP 1380 .freeze = virtio_ccw_freeze, 1381 .thaw = virtio_ccw_restore, 1382 .restore = virtio_ccw_restore, 1383 #endif 1384 }; 1385 1386 static int __init pure_hex(char **cp, unsigned int *val, int min_digit, 1387 int max_digit, int max_val) 1388 { 1389 int diff; 1390 1391 diff = 0; 1392 *val = 0; 1393 1394 while (diff <= max_digit) { 1395 int value = hex_to_bin(**cp); 1396 1397 if (value < 0) 1398 break; 1399 *val = *val * 16 + value; 1400 (*cp)++; 1401 diff++; 1402 } 1403 1404 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) 1405 return 1; 1406 1407 return 0; 1408 } 1409 1410 static int __init parse_busid(char *str, unsigned int *cssid, 1411 unsigned int *ssid, unsigned int *devno) 1412 { 1413 char *str_work; 1414 int rc, ret; 1415 1416 rc = 1; 1417 1418 if (*str == '\0') 1419 goto out; 1420 1421 str_work = str; 1422 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); 1423 if (ret || (str_work[0] != '.')) 1424 goto out; 1425 str_work++; 1426 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); 1427 if (ret || (str_work[0] != '.')) 1428 goto out; 1429 str_work++; 1430 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); 1431 if (ret || (str_work[0] != '\0')) 1432 goto out; 1433 1434 rc = 0; 1435 out: 1436 return rc; 1437 } 1438 1439 static void __init no_auto_parse(void) 1440 { 1441 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; 1442 char *parm, *str; 1443 int rc; 1444 1445 str = no_auto; 1446 while ((parm = strsep(&str, ","))) { 1447 rc = parse_busid(strsep(&parm, "-"), &from_cssid, 1448 &from_ssid, &from); 1449 if (rc) 1450 continue; 1451 if (parm != NULL) { 1452 rc = parse_busid(parm, &to_cssid, 1453 &to_ssid, &to); 1454 if ((from_ssid > to_ssid) || 1455 ((from_ssid == to_ssid) && (from > to))) 1456 rc = -EINVAL; 1457 } else { 1458 to_cssid = from_cssid; 1459 to_ssid = from_ssid; 1460 to = from; 1461 } 1462 if (rc) 1463 continue; 1464 while ((from_ssid < to_ssid) || 1465 ((from_ssid == to_ssid) && (from <= to))) { 1466 set_bit(from, devs_no_auto[from_ssid]); 1467 from++; 1468 if (from > __MAX_SUBCHANNEL) { 1469 from_ssid++; 1470 from = 0; 1471 } 1472 } 1473 } 1474 } 1475 1476 static int __init virtio_ccw_init(void) 1477 { 1478 /* parse no_auto string before we do anything further */ 1479 no_auto_parse(); 1480 return ccw_driver_register(&virtio_ccw_driver); 1481 } 1482 device_initcall(virtio_ccw_init); 1483