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/bootmem.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 list_head virtqueues; 60 unsigned long indicators; 61 unsigned long indicators2; 62 struct vq_config_block *config_block; 63 bool is_thinint; 64 bool going_away; 65 bool device_lost; 66 unsigned int config_ready; 67 void *airq_info; 68 }; 69 70 struct vq_info_block_legacy { 71 __u64 queue; 72 __u32 align; 73 __u16 index; 74 __u16 num; 75 } __packed; 76 77 struct vq_info_block { 78 __u64 desc; 79 __u32 res0; 80 __u16 index; 81 __u16 num; 82 __u64 avail; 83 __u64 used; 84 } __packed; 85 86 struct virtio_feature_desc { 87 __le32 features; 88 __u8 index; 89 } __packed; 90 91 struct virtio_thinint_area { 92 unsigned long summary_indicator; 93 unsigned long indicator; 94 u64 bit_nr; 95 u8 isc; 96 } __packed; 97 98 struct virtio_rev_info { 99 __u16 revision; 100 __u16 length; 101 __u8 data[]; 102 }; 103 104 /* the highest virtio-ccw revision we support */ 105 #define VIRTIO_CCW_REV_MAX 1 106 107 struct virtio_ccw_vq_info { 108 struct virtqueue *vq; 109 int num; 110 void *queue; 111 union { 112 struct vq_info_block s; 113 struct vq_info_block_legacy l; 114 } *info_block; 115 int bit_nr; 116 struct list_head node; 117 long cookie; 118 }; 119 120 #define VIRTIO_AIRQ_ISC IO_SCH_ISC /* inherit from subchannel */ 121 122 #define VIRTIO_IV_BITS (L1_CACHE_BYTES * 8) 123 #define MAX_AIRQ_AREAS 20 124 125 static int virtio_ccw_use_airq = 1; 126 127 struct airq_info { 128 rwlock_t lock; 129 u8 summary_indicator; 130 struct airq_struct airq; 131 struct airq_iv *aiv; 132 }; 133 static struct airq_info *airq_areas[MAX_AIRQ_AREAS]; 134 135 #define CCW_CMD_SET_VQ 0x13 136 #define CCW_CMD_VDEV_RESET 0x33 137 #define CCW_CMD_SET_IND 0x43 138 #define CCW_CMD_SET_CONF_IND 0x53 139 #define CCW_CMD_READ_FEAT 0x12 140 #define CCW_CMD_WRITE_FEAT 0x11 141 #define CCW_CMD_READ_CONF 0x22 142 #define CCW_CMD_WRITE_CONF 0x21 143 #define CCW_CMD_WRITE_STATUS 0x31 144 #define CCW_CMD_READ_VQ_CONF 0x32 145 #define CCW_CMD_READ_STATUS 0x72 146 #define CCW_CMD_SET_IND_ADAPTER 0x73 147 #define CCW_CMD_SET_VIRTIO_REV 0x83 148 149 #define VIRTIO_CCW_DOING_SET_VQ 0x00010000 150 #define VIRTIO_CCW_DOING_RESET 0x00040000 151 #define VIRTIO_CCW_DOING_READ_FEAT 0x00080000 152 #define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000 153 #define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000 154 #define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000 155 #define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000 156 #define VIRTIO_CCW_DOING_SET_IND 0x01000000 157 #define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000 158 #define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000 159 #define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000 160 #define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000 161 #define VIRTIO_CCW_DOING_READ_STATUS 0x20000000 162 #define VIRTIO_CCW_INTPARM_MASK 0xffff0000 163 164 static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev) 165 { 166 return container_of(vdev, struct virtio_ccw_device, vdev); 167 } 168 169 static void drop_airq_indicator(struct virtqueue *vq, struct airq_info *info) 170 { 171 unsigned long i, flags; 172 173 write_lock_irqsave(&info->lock, flags); 174 for (i = 0; i < airq_iv_end(info->aiv); i++) { 175 if (vq == (void *)airq_iv_get_ptr(info->aiv, i)) { 176 airq_iv_free_bit(info->aiv, i); 177 airq_iv_set_ptr(info->aiv, i, 0); 178 break; 179 } 180 } 181 write_unlock_irqrestore(&info->lock, flags); 182 } 183 184 static void virtio_airq_handler(struct airq_struct *airq) 185 { 186 struct airq_info *info = container_of(airq, struct airq_info, airq); 187 unsigned long ai; 188 189 inc_irq_stat(IRQIO_VAI); 190 read_lock(&info->lock); 191 /* Walk through indicators field, summary indicator active. */ 192 for (ai = 0;;) { 193 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv)); 194 if (ai == -1UL) 195 break; 196 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai)); 197 } 198 info->summary_indicator = 0; 199 smp_wmb(); 200 /* Walk through indicators field, summary indicator not active. */ 201 for (ai = 0;;) { 202 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv)); 203 if (ai == -1UL) 204 break; 205 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai)); 206 } 207 read_unlock(&info->lock); 208 } 209 210 static struct airq_info *new_airq_info(void) 211 { 212 struct airq_info *info; 213 int rc; 214 215 info = kzalloc(sizeof(*info), GFP_KERNEL); 216 if (!info) 217 return NULL; 218 rwlock_init(&info->lock); 219 info->aiv = airq_iv_create(VIRTIO_IV_BITS, AIRQ_IV_ALLOC | AIRQ_IV_PTR); 220 if (!info->aiv) { 221 kfree(info); 222 return NULL; 223 } 224 info->airq.handler = virtio_airq_handler; 225 info->airq.lsi_ptr = &info->summary_indicator; 226 info->airq.lsi_mask = 0xff; 227 info->airq.isc = VIRTIO_AIRQ_ISC; 228 rc = register_adapter_interrupt(&info->airq); 229 if (rc) { 230 airq_iv_release(info->aiv); 231 kfree(info); 232 return NULL; 233 } 234 return info; 235 } 236 237 static unsigned long get_airq_indicator(struct virtqueue *vqs[], int nvqs, 238 u64 *first, void **airq_info) 239 { 240 int i, j; 241 struct airq_info *info; 242 unsigned long indicator_addr = 0; 243 unsigned long bit, flags; 244 245 for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) { 246 if (!airq_areas[i]) 247 airq_areas[i] = new_airq_info(); 248 info = airq_areas[i]; 249 if (!info) 250 return 0; 251 write_lock_irqsave(&info->lock, flags); 252 bit = airq_iv_alloc(info->aiv, nvqs); 253 if (bit == -1UL) { 254 /* Not enough vacancies. */ 255 write_unlock_irqrestore(&info->lock, flags); 256 continue; 257 } 258 *first = bit; 259 *airq_info = info; 260 indicator_addr = (unsigned long)info->aiv->vector; 261 for (j = 0; j < nvqs; j++) { 262 airq_iv_set_ptr(info->aiv, bit + j, 263 (unsigned long)vqs[j]); 264 } 265 write_unlock_irqrestore(&info->lock, flags); 266 } 267 return indicator_addr; 268 } 269 270 static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev) 271 { 272 struct virtio_ccw_vq_info *info; 273 274 list_for_each_entry(info, &vcdev->virtqueues, node) 275 drop_airq_indicator(info->vq, vcdev->airq_info); 276 } 277 278 static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag) 279 { 280 unsigned long flags; 281 __u32 ret; 282 283 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); 284 if (vcdev->err) 285 ret = 0; 286 else 287 ret = vcdev->curr_io & flag; 288 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); 289 return ret; 290 } 291 292 static int ccw_io_helper(struct virtio_ccw_device *vcdev, 293 struct ccw1 *ccw, __u32 intparm) 294 { 295 int ret; 296 unsigned long flags; 297 int flag = intparm & VIRTIO_CCW_INTPARM_MASK; 298 299 do { 300 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); 301 ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0); 302 if (!ret) { 303 if (!vcdev->curr_io) 304 vcdev->err = 0; 305 vcdev->curr_io |= flag; 306 } 307 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); 308 cpu_relax(); 309 } while (ret == -EBUSY); 310 wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0); 311 return ret ? ret : vcdev->err; 312 } 313 314 static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev, 315 struct ccw1 *ccw) 316 { 317 int ret; 318 unsigned long *indicatorp = NULL; 319 struct virtio_thinint_area *thinint_area = NULL; 320 struct airq_info *airq_info = vcdev->airq_info; 321 322 if (vcdev->is_thinint) { 323 thinint_area = kzalloc(sizeof(*thinint_area), 324 GFP_DMA | GFP_KERNEL); 325 if (!thinint_area) 326 return; 327 thinint_area->summary_indicator = 328 (unsigned long) &airq_info->summary_indicator; 329 thinint_area->isc = VIRTIO_AIRQ_ISC; 330 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; 331 ccw->count = sizeof(*thinint_area); 332 ccw->cda = (__u32)(unsigned long) thinint_area; 333 } else { 334 /* payload is the address of the indicators */ 335 indicatorp = kmalloc(sizeof(&vcdev->indicators), 336 GFP_DMA | GFP_KERNEL); 337 if (!indicatorp) 338 return; 339 *indicatorp = 0; 340 ccw->cmd_code = CCW_CMD_SET_IND; 341 ccw->count = sizeof(&vcdev->indicators); 342 ccw->cda = (__u32)(unsigned long) indicatorp; 343 } 344 /* Deregister indicators from host. */ 345 vcdev->indicators = 0; 346 ccw->flags = 0; 347 ret = ccw_io_helper(vcdev, ccw, 348 vcdev->is_thinint ? 349 VIRTIO_CCW_DOING_SET_IND_ADAPTER : 350 VIRTIO_CCW_DOING_SET_IND); 351 if (ret && (ret != -ENODEV)) 352 dev_info(&vcdev->cdev->dev, 353 "Failed to deregister indicators (%d)\n", ret); 354 else if (vcdev->is_thinint) 355 virtio_ccw_drop_indicators(vcdev); 356 kfree(indicatorp); 357 kfree(thinint_area); 358 } 359 360 static inline long __do_kvm_notify(struct subchannel_id schid, 361 unsigned long queue_index, 362 long cookie) 363 { 364 register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY; 365 register struct subchannel_id __schid asm("2") = schid; 366 register unsigned long __index asm("3") = queue_index; 367 register long __rc asm("2"); 368 register long __cookie asm("4") = cookie; 369 370 asm volatile ("diag 2,4,0x500\n" 371 : "=d" (__rc) : "d" (__nr), "d" (__schid), "d" (__index), 372 "d"(__cookie) 373 : "memory", "cc"); 374 return __rc; 375 } 376 377 static inline long do_kvm_notify(struct subchannel_id schid, 378 unsigned long queue_index, 379 long cookie) 380 { 381 diag_stat_inc(DIAG_STAT_X500); 382 return __do_kvm_notify(schid, queue_index, cookie); 383 } 384 385 static bool virtio_ccw_kvm_notify(struct virtqueue *vq) 386 { 387 struct virtio_ccw_vq_info *info = vq->priv; 388 struct virtio_ccw_device *vcdev; 389 struct subchannel_id schid; 390 391 vcdev = to_vc_device(info->vq->vdev); 392 ccw_device_get_schid(vcdev->cdev, &schid); 393 info->cookie = do_kvm_notify(schid, vq->index, info->cookie); 394 if (info->cookie < 0) 395 return false; 396 return true; 397 } 398 399 static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev, 400 struct ccw1 *ccw, int index) 401 { 402 int ret; 403 404 vcdev->config_block->index = index; 405 ccw->cmd_code = CCW_CMD_READ_VQ_CONF; 406 ccw->flags = 0; 407 ccw->count = sizeof(struct vq_config_block); 408 ccw->cda = (__u32)(unsigned long)(vcdev->config_block); 409 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF); 410 if (ret) 411 return ret; 412 return vcdev->config_block->num; 413 } 414 415 static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw) 416 { 417 struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev); 418 struct virtio_ccw_vq_info *info = vq->priv; 419 unsigned long flags; 420 unsigned long size; 421 int ret; 422 unsigned int index = vq->index; 423 424 /* Remove from our list. */ 425 spin_lock_irqsave(&vcdev->lock, flags); 426 list_del(&info->node); 427 spin_unlock_irqrestore(&vcdev->lock, flags); 428 429 /* Release from host. */ 430 if (vcdev->revision == 0) { 431 info->info_block->l.queue = 0; 432 info->info_block->l.align = 0; 433 info->info_block->l.index = index; 434 info->info_block->l.num = 0; 435 ccw->count = sizeof(info->info_block->l); 436 } else { 437 info->info_block->s.desc = 0; 438 info->info_block->s.index = index; 439 info->info_block->s.num = 0; 440 info->info_block->s.avail = 0; 441 info->info_block->s.used = 0; 442 ccw->count = sizeof(info->info_block->s); 443 } 444 ccw->cmd_code = CCW_CMD_SET_VQ; 445 ccw->flags = 0; 446 ccw->cda = (__u32)(unsigned long)(info->info_block); 447 ret = ccw_io_helper(vcdev, ccw, 448 VIRTIO_CCW_DOING_SET_VQ | index); 449 /* 450 * -ENODEV isn't considered an error: The device is gone anyway. 451 * This may happen on device detach. 452 */ 453 if (ret && (ret != -ENODEV)) 454 dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d\n", 455 ret, index); 456 457 vring_del_virtqueue(vq); 458 size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN)); 459 free_pages_exact(info->queue, size); 460 kfree(info->info_block); 461 kfree(info); 462 } 463 464 static void virtio_ccw_del_vqs(struct virtio_device *vdev) 465 { 466 struct virtqueue *vq, *n; 467 struct ccw1 *ccw; 468 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 469 470 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 471 if (!ccw) 472 return; 473 474 virtio_ccw_drop_indicator(vcdev, ccw); 475 476 list_for_each_entry_safe(vq, n, &vdev->vqs, list) 477 virtio_ccw_del_vq(vq, ccw); 478 479 kfree(ccw); 480 } 481 482 static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev, 483 int i, vq_callback_t *callback, 484 const char *name, bool ctx, 485 struct ccw1 *ccw) 486 { 487 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 488 int err; 489 struct virtqueue *vq = NULL; 490 struct virtio_ccw_vq_info *info; 491 unsigned long size = 0; /* silence the compiler */ 492 unsigned long flags; 493 494 /* Allocate queue. */ 495 info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL); 496 if (!info) { 497 dev_warn(&vcdev->cdev->dev, "no info\n"); 498 err = -ENOMEM; 499 goto out_err; 500 } 501 info->info_block = kzalloc(sizeof(*info->info_block), 502 GFP_DMA | GFP_KERNEL); 503 if (!info->info_block) { 504 dev_warn(&vcdev->cdev->dev, "no info block\n"); 505 err = -ENOMEM; 506 goto out_err; 507 } 508 info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i); 509 if (info->num < 0) { 510 err = info->num; 511 goto out_err; 512 } 513 size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN)); 514 info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO); 515 if (info->queue == NULL) { 516 dev_warn(&vcdev->cdev->dev, "no queue\n"); 517 err = -ENOMEM; 518 goto out_err; 519 } 520 521 vq = vring_new_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, vdev, 522 true, ctx, info->queue, virtio_ccw_kvm_notify, 523 callback, name); 524 if (!vq) { 525 /* For now, we fail if we can't get the requested size. */ 526 dev_warn(&vcdev->cdev->dev, "no vq\n"); 527 err = -ENOMEM; 528 goto out_err; 529 } 530 531 /* Register it with the host. */ 532 if (vcdev->revision == 0) { 533 info->info_block->l.queue = (__u64)info->queue; 534 info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN; 535 info->info_block->l.index = i; 536 info->info_block->l.num = info->num; 537 ccw->count = sizeof(info->info_block->l); 538 } else { 539 info->info_block->s.desc = (__u64)info->queue; 540 info->info_block->s.index = i; 541 info->info_block->s.num = info->num; 542 info->info_block->s.avail = (__u64)virtqueue_get_avail(vq); 543 info->info_block->s.used = (__u64)virtqueue_get_used(vq); 544 ccw->count = sizeof(info->info_block->s); 545 } 546 ccw->cmd_code = CCW_CMD_SET_VQ; 547 ccw->flags = 0; 548 ccw->cda = (__u32)(unsigned long)(info->info_block); 549 err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i); 550 if (err) { 551 dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n"); 552 goto out_err; 553 } 554 555 info->vq = vq; 556 vq->priv = info; 557 558 /* Save it to our list. */ 559 spin_lock_irqsave(&vcdev->lock, flags); 560 list_add(&info->node, &vcdev->virtqueues); 561 spin_unlock_irqrestore(&vcdev->lock, flags); 562 563 return vq; 564 565 out_err: 566 if (vq) 567 vring_del_virtqueue(vq); 568 if (info) { 569 if (info->queue) 570 free_pages_exact(info->queue, size); 571 kfree(info->info_block); 572 } 573 kfree(info); 574 return ERR_PTR(err); 575 } 576 577 static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev, 578 struct virtqueue *vqs[], int nvqs, 579 struct ccw1 *ccw) 580 { 581 int ret; 582 struct virtio_thinint_area *thinint_area = NULL; 583 struct airq_info *info; 584 585 thinint_area = kzalloc(sizeof(*thinint_area), GFP_DMA | GFP_KERNEL); 586 if (!thinint_area) { 587 ret = -ENOMEM; 588 goto out; 589 } 590 /* Try to get an indicator. */ 591 thinint_area->indicator = get_airq_indicator(vqs, nvqs, 592 &thinint_area->bit_nr, 593 &vcdev->airq_info); 594 if (!thinint_area->indicator) { 595 ret = -ENOSPC; 596 goto out; 597 } 598 info = vcdev->airq_info; 599 thinint_area->summary_indicator = 600 (unsigned long) &info->summary_indicator; 601 thinint_area->isc = VIRTIO_AIRQ_ISC; 602 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; 603 ccw->flags = CCW_FLAG_SLI; 604 ccw->count = sizeof(*thinint_area); 605 ccw->cda = (__u32)(unsigned long)thinint_area; 606 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER); 607 if (ret) { 608 if (ret == -EOPNOTSUPP) { 609 /* 610 * The host does not support adapter interrupts 611 * for virtio-ccw, stop trying. 612 */ 613 virtio_ccw_use_airq = 0; 614 pr_info("Adapter interrupts unsupported on host\n"); 615 } else 616 dev_warn(&vcdev->cdev->dev, 617 "enabling adapter interrupts = %d\n", ret); 618 virtio_ccw_drop_indicators(vcdev); 619 } 620 out: 621 kfree(thinint_area); 622 return ret; 623 } 624 625 static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, 626 struct virtqueue *vqs[], 627 vq_callback_t *callbacks[], 628 const char * const names[], 629 const bool *ctx, 630 struct irq_affinity *desc) 631 { 632 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 633 unsigned long *indicatorp = NULL; 634 int ret, i; 635 struct ccw1 *ccw; 636 637 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 638 if (!ccw) 639 return -ENOMEM; 640 641 for (i = 0; i < nvqs; ++i) { 642 vqs[i] = virtio_ccw_setup_vq(vdev, i, callbacks[i], names[i], 643 ctx ? ctx[i] : false, ccw); 644 if (IS_ERR(vqs[i])) { 645 ret = PTR_ERR(vqs[i]); 646 vqs[i] = NULL; 647 goto out; 648 } 649 } 650 ret = -ENOMEM; 651 /* 652 * We need a data area under 2G to communicate. Our payload is 653 * the address of the indicators. 654 */ 655 indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL); 656 if (!indicatorp) 657 goto out; 658 *indicatorp = (unsigned long) &vcdev->indicators; 659 if (vcdev->is_thinint) { 660 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw); 661 if (ret) 662 /* no error, just fall back to legacy interrupts */ 663 vcdev->is_thinint = false; 664 } 665 if (!vcdev->is_thinint) { 666 /* Register queue indicators with host. */ 667 vcdev->indicators = 0; 668 ccw->cmd_code = CCW_CMD_SET_IND; 669 ccw->flags = 0; 670 ccw->count = sizeof(&vcdev->indicators); 671 ccw->cda = (__u32)(unsigned long) indicatorp; 672 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND); 673 if (ret) 674 goto out; 675 } 676 /* Register indicators2 with host for config changes */ 677 *indicatorp = (unsigned long) &vcdev->indicators2; 678 vcdev->indicators2 = 0; 679 ccw->cmd_code = CCW_CMD_SET_CONF_IND; 680 ccw->flags = 0; 681 ccw->count = sizeof(&vcdev->indicators2); 682 ccw->cda = (__u32)(unsigned long) indicatorp; 683 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND); 684 if (ret) 685 goto out; 686 687 kfree(indicatorp); 688 kfree(ccw); 689 return 0; 690 out: 691 kfree(indicatorp); 692 kfree(ccw); 693 virtio_ccw_del_vqs(vdev); 694 return ret; 695 } 696 697 static void virtio_ccw_reset(struct virtio_device *vdev) 698 { 699 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 700 struct ccw1 *ccw; 701 702 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 703 if (!ccw) 704 return; 705 706 /* Zero status bits. */ 707 *vcdev->status = 0; 708 709 /* Send a reset ccw on device. */ 710 ccw->cmd_code = CCW_CMD_VDEV_RESET; 711 ccw->flags = 0; 712 ccw->count = 0; 713 ccw->cda = 0; 714 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET); 715 kfree(ccw); 716 } 717 718 static u64 virtio_ccw_get_features(struct virtio_device *vdev) 719 { 720 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 721 struct virtio_feature_desc *features; 722 int ret; 723 u64 rc; 724 struct ccw1 *ccw; 725 726 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 727 if (!ccw) 728 return 0; 729 730 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL); 731 if (!features) { 732 rc = 0; 733 goto out_free; 734 } 735 /* Read the feature bits from the host. */ 736 features->index = 0; 737 ccw->cmd_code = CCW_CMD_READ_FEAT; 738 ccw->flags = 0; 739 ccw->count = sizeof(*features); 740 ccw->cda = (__u32)(unsigned long)features; 741 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 742 if (ret) { 743 rc = 0; 744 goto out_free; 745 } 746 747 rc = le32_to_cpu(features->features); 748 749 if (vcdev->revision == 0) 750 goto out_free; 751 752 /* Read second half of the feature bits from the host. */ 753 features->index = 1; 754 ccw->cmd_code = CCW_CMD_READ_FEAT; 755 ccw->flags = 0; 756 ccw->count = sizeof(*features); 757 ccw->cda = (__u32)(unsigned long)features; 758 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 759 if (ret == 0) 760 rc |= (u64)le32_to_cpu(features->features) << 32; 761 762 out_free: 763 kfree(features); 764 kfree(ccw); 765 return rc; 766 } 767 768 static int virtio_ccw_finalize_features(struct virtio_device *vdev) 769 { 770 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 771 struct virtio_feature_desc *features; 772 struct ccw1 *ccw; 773 int ret; 774 775 if (vcdev->revision >= 1 && 776 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { 777 dev_err(&vdev->dev, "virtio: device uses revision 1 " 778 "but does not have VIRTIO_F_VERSION_1\n"); 779 return -EINVAL; 780 } 781 782 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 783 if (!ccw) 784 return -ENOMEM; 785 786 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL); 787 if (!features) { 788 ret = -ENOMEM; 789 goto out_free; 790 } 791 /* Give virtio_ring a chance to accept features. */ 792 vring_transport_features(vdev); 793 794 features->index = 0; 795 features->features = cpu_to_le32((u32)vdev->features); 796 /* Write the first half of the feature bits to the host. */ 797 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 798 ccw->flags = 0; 799 ccw->count = sizeof(*features); 800 ccw->cda = (__u32)(unsigned long)features; 801 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 802 if (ret) 803 goto out_free; 804 805 if (vcdev->revision == 0) 806 goto out_free; 807 808 features->index = 1; 809 features->features = cpu_to_le32(vdev->features >> 32); 810 /* Write the second half of the feature bits to the host. */ 811 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 812 ccw->flags = 0; 813 ccw->count = sizeof(*features); 814 ccw->cda = (__u32)(unsigned long)features; 815 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 816 817 out_free: 818 kfree(features); 819 kfree(ccw); 820 821 return ret; 822 } 823 824 static void virtio_ccw_get_config(struct virtio_device *vdev, 825 unsigned int offset, void *buf, unsigned len) 826 { 827 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 828 int ret; 829 struct ccw1 *ccw; 830 void *config_area; 831 832 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 833 if (!ccw) 834 return; 835 836 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL); 837 if (!config_area) 838 goto out_free; 839 840 /* Read the config area from the host. */ 841 ccw->cmd_code = CCW_CMD_READ_CONF; 842 ccw->flags = 0; 843 ccw->count = offset + len; 844 ccw->cda = (__u32)(unsigned long)config_area; 845 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG); 846 if (ret) 847 goto out_free; 848 849 memcpy(vcdev->config, config_area, offset + len); 850 if (buf) 851 memcpy(buf, &vcdev->config[offset], len); 852 if (vcdev->config_ready < offset + len) 853 vcdev->config_ready = offset + len; 854 855 out_free: 856 kfree(config_area); 857 kfree(ccw); 858 } 859 860 static void virtio_ccw_set_config(struct virtio_device *vdev, 861 unsigned int offset, const void *buf, 862 unsigned len) 863 { 864 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 865 struct ccw1 *ccw; 866 void *config_area; 867 868 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 869 if (!ccw) 870 return; 871 872 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL); 873 if (!config_area) 874 goto out_free; 875 876 /* Make sure we don't overwrite fields. */ 877 if (vcdev->config_ready < offset) 878 virtio_ccw_get_config(vdev, 0, NULL, offset); 879 memcpy(&vcdev->config[offset], buf, len); 880 /* Write the config area to the host. */ 881 memcpy(config_area, vcdev->config, sizeof(vcdev->config)); 882 ccw->cmd_code = CCW_CMD_WRITE_CONF; 883 ccw->flags = 0; 884 ccw->count = offset + len; 885 ccw->cda = (__u32)(unsigned long)config_area; 886 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG); 887 888 out_free: 889 kfree(config_area); 890 kfree(ccw); 891 } 892 893 static u8 virtio_ccw_get_status(struct virtio_device *vdev) 894 { 895 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 896 u8 old_status = *vcdev->status; 897 struct ccw1 *ccw; 898 899 if (vcdev->revision < 1) 900 return *vcdev->status; 901 902 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 903 if (!ccw) 904 return old_status; 905 906 ccw->cmd_code = CCW_CMD_READ_STATUS; 907 ccw->flags = 0; 908 ccw->count = sizeof(*vcdev->status); 909 ccw->cda = (__u32)(unsigned long)vcdev->status; 910 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS); 911 /* 912 * If the channel program failed (should only happen if the device 913 * was hotunplugged, and then we clean up via the machine check 914 * handler anyway), vcdev->status was not overwritten and we just 915 * return the old status, which is fine. 916 */ 917 kfree(ccw); 918 919 return *vcdev->status; 920 } 921 922 static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status) 923 { 924 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 925 u8 old_status = *vcdev->status; 926 struct ccw1 *ccw; 927 int ret; 928 929 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 930 if (!ccw) 931 return; 932 933 /* Write the status to the host. */ 934 *vcdev->status = status; 935 ccw->cmd_code = CCW_CMD_WRITE_STATUS; 936 ccw->flags = 0; 937 ccw->count = sizeof(status); 938 ccw->cda = (__u32)(unsigned long)vcdev->status; 939 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS); 940 /* Write failed? We assume status is unchanged. */ 941 if (ret) 942 *vcdev->status = old_status; 943 kfree(ccw); 944 } 945 946 static const struct virtio_config_ops virtio_ccw_config_ops = { 947 .get_features = virtio_ccw_get_features, 948 .finalize_features = virtio_ccw_finalize_features, 949 .get = virtio_ccw_get_config, 950 .set = virtio_ccw_set_config, 951 .get_status = virtio_ccw_get_status, 952 .set_status = virtio_ccw_set_status, 953 .reset = virtio_ccw_reset, 954 .find_vqs = virtio_ccw_find_vqs, 955 .del_vqs = virtio_ccw_del_vqs, 956 }; 957 958 959 /* 960 * ccw bus driver related functions 961 */ 962 963 static void virtio_ccw_release_dev(struct device *_d) 964 { 965 struct virtio_device *dev = dev_to_virtio(_d); 966 struct virtio_ccw_device *vcdev = to_vc_device(dev); 967 968 kfree(vcdev->status); 969 kfree(vcdev->config_block); 970 kfree(vcdev); 971 } 972 973 static int irb_is_error(struct irb *irb) 974 { 975 if (scsw_cstat(&irb->scsw) != 0) 976 return 1; 977 if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) 978 return 1; 979 if (scsw_cc(&irb->scsw) != 0) 980 return 1; 981 return 0; 982 } 983 984 static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev, 985 int index) 986 { 987 struct virtio_ccw_vq_info *info; 988 unsigned long flags; 989 struct virtqueue *vq; 990 991 vq = NULL; 992 spin_lock_irqsave(&vcdev->lock, flags); 993 list_for_each_entry(info, &vcdev->virtqueues, node) { 994 if (info->vq->index == index) { 995 vq = info->vq; 996 break; 997 } 998 } 999 spin_unlock_irqrestore(&vcdev->lock, flags); 1000 return vq; 1001 } 1002 1003 static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev, 1004 __u32 activity) 1005 { 1006 if (vcdev->curr_io & activity) { 1007 switch (activity) { 1008 case VIRTIO_CCW_DOING_READ_FEAT: 1009 case VIRTIO_CCW_DOING_WRITE_FEAT: 1010 case VIRTIO_CCW_DOING_READ_CONFIG: 1011 case VIRTIO_CCW_DOING_WRITE_CONFIG: 1012 case VIRTIO_CCW_DOING_WRITE_STATUS: 1013 case VIRTIO_CCW_DOING_READ_STATUS: 1014 case VIRTIO_CCW_DOING_SET_VQ: 1015 case VIRTIO_CCW_DOING_SET_IND: 1016 case VIRTIO_CCW_DOING_SET_CONF_IND: 1017 case VIRTIO_CCW_DOING_RESET: 1018 case VIRTIO_CCW_DOING_READ_VQ_CONF: 1019 case VIRTIO_CCW_DOING_SET_IND_ADAPTER: 1020 case VIRTIO_CCW_DOING_SET_VIRTIO_REV: 1021 vcdev->curr_io &= ~activity; 1022 wake_up(&vcdev->wait_q); 1023 break; 1024 default: 1025 /* don't know what to do... */ 1026 dev_warn(&vcdev->cdev->dev, 1027 "Suspicious activity '%08x'\n", activity); 1028 WARN_ON(1); 1029 break; 1030 } 1031 } 1032 } 1033 1034 static void virtio_ccw_int_handler(struct ccw_device *cdev, 1035 unsigned long intparm, 1036 struct irb *irb) 1037 { 1038 __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK; 1039 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1040 int i; 1041 struct virtqueue *vq; 1042 1043 if (!vcdev) 1044 return; 1045 if (IS_ERR(irb)) { 1046 vcdev->err = PTR_ERR(irb); 1047 virtio_ccw_check_activity(vcdev, activity); 1048 /* Don't poke around indicators, something's wrong. */ 1049 return; 1050 } 1051 /* Check if it's a notification from the host. */ 1052 if ((intparm == 0) && 1053 (scsw_stctl(&irb->scsw) == 1054 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) { 1055 /* OK */ 1056 } 1057 if (irb_is_error(irb)) { 1058 /* Command reject? */ 1059 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) && 1060 (irb->ecw[0] & SNS0_CMD_REJECT)) 1061 vcdev->err = -EOPNOTSUPP; 1062 else 1063 /* Map everything else to -EIO. */ 1064 vcdev->err = -EIO; 1065 } 1066 virtio_ccw_check_activity(vcdev, activity); 1067 for_each_set_bit(i, &vcdev->indicators, 1068 sizeof(vcdev->indicators) * BITS_PER_BYTE) { 1069 /* The bit clear must happen before the vring kick. */ 1070 clear_bit(i, &vcdev->indicators); 1071 barrier(); 1072 vq = virtio_ccw_vq_by_ind(vcdev, i); 1073 vring_interrupt(0, vq); 1074 } 1075 if (test_bit(0, &vcdev->indicators2)) { 1076 virtio_config_changed(&vcdev->vdev); 1077 clear_bit(0, &vcdev->indicators2); 1078 } 1079 } 1080 1081 /* 1082 * We usually want to autoonline all devices, but give the admin 1083 * a way to exempt devices from this. 1084 */ 1085 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ 1086 (8*sizeof(long))) 1087 static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS]; 1088 1089 static char *no_auto = ""; 1090 1091 module_param(no_auto, charp, 0444); 1092 MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined"); 1093 1094 static int virtio_ccw_check_autoonline(struct ccw_device *cdev) 1095 { 1096 struct ccw_dev_id id; 1097 1098 ccw_device_get_id(cdev, &id); 1099 if (test_bit(id.devno, devs_no_auto[id.ssid])) 1100 return 0; 1101 return 1; 1102 } 1103 1104 static void virtio_ccw_auto_online(void *data, async_cookie_t cookie) 1105 { 1106 struct ccw_device *cdev = data; 1107 int ret; 1108 1109 ret = ccw_device_set_online(cdev); 1110 if (ret) 1111 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret); 1112 } 1113 1114 static int virtio_ccw_probe(struct ccw_device *cdev) 1115 { 1116 cdev->handler = virtio_ccw_int_handler; 1117 1118 if (virtio_ccw_check_autoonline(cdev)) 1119 async_schedule(virtio_ccw_auto_online, cdev); 1120 return 0; 1121 } 1122 1123 static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev) 1124 { 1125 unsigned long flags; 1126 struct virtio_ccw_device *vcdev; 1127 1128 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1129 vcdev = dev_get_drvdata(&cdev->dev); 1130 if (!vcdev || vcdev->going_away) { 1131 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1132 return NULL; 1133 } 1134 vcdev->going_away = true; 1135 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1136 return vcdev; 1137 } 1138 1139 static void virtio_ccw_remove(struct ccw_device *cdev) 1140 { 1141 unsigned long flags; 1142 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1143 1144 if (vcdev && cdev->online) { 1145 if (vcdev->device_lost) 1146 virtio_break_device(&vcdev->vdev); 1147 unregister_virtio_device(&vcdev->vdev); 1148 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1149 dev_set_drvdata(&cdev->dev, NULL); 1150 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1151 } 1152 cdev->handler = NULL; 1153 } 1154 1155 static int virtio_ccw_offline(struct ccw_device *cdev) 1156 { 1157 unsigned long flags; 1158 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1159 1160 if (!vcdev) 1161 return 0; 1162 if (vcdev->device_lost) 1163 virtio_break_device(&vcdev->vdev); 1164 unregister_virtio_device(&vcdev->vdev); 1165 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1166 dev_set_drvdata(&cdev->dev, NULL); 1167 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1168 return 0; 1169 } 1170 1171 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev) 1172 { 1173 struct virtio_rev_info *rev; 1174 struct ccw1 *ccw; 1175 int ret; 1176 1177 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); 1178 if (!ccw) 1179 return -ENOMEM; 1180 rev = kzalloc(sizeof(*rev), GFP_DMA | GFP_KERNEL); 1181 if (!rev) { 1182 kfree(ccw); 1183 return -ENOMEM; 1184 } 1185 1186 /* Set transport revision */ 1187 ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV; 1188 ccw->flags = 0; 1189 ccw->count = sizeof(*rev); 1190 ccw->cda = (__u32)(unsigned long)rev; 1191 1192 vcdev->revision = VIRTIO_CCW_REV_MAX; 1193 do { 1194 rev->revision = vcdev->revision; 1195 /* none of our supported revisions carry payload */ 1196 rev->length = 0; 1197 ret = ccw_io_helper(vcdev, ccw, 1198 VIRTIO_CCW_DOING_SET_VIRTIO_REV); 1199 if (ret == -EOPNOTSUPP) { 1200 if (vcdev->revision == 0) 1201 /* 1202 * The host device does not support setting 1203 * the revision: let's operate it in legacy 1204 * mode. 1205 */ 1206 ret = 0; 1207 else 1208 vcdev->revision--; 1209 } 1210 } while (ret == -EOPNOTSUPP); 1211 1212 kfree(ccw); 1213 kfree(rev); 1214 return ret; 1215 } 1216 1217 static int virtio_ccw_online(struct ccw_device *cdev) 1218 { 1219 int ret; 1220 struct virtio_ccw_device *vcdev; 1221 unsigned long flags; 1222 1223 vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL); 1224 if (!vcdev) { 1225 dev_warn(&cdev->dev, "Could not get memory for virtio\n"); 1226 ret = -ENOMEM; 1227 goto out_free; 1228 } 1229 vcdev->config_block = kzalloc(sizeof(*vcdev->config_block), 1230 GFP_DMA | GFP_KERNEL); 1231 if (!vcdev->config_block) { 1232 ret = -ENOMEM; 1233 goto out_free; 1234 } 1235 vcdev->status = kzalloc(sizeof(*vcdev->status), GFP_DMA | GFP_KERNEL); 1236 if (!vcdev->status) { 1237 ret = -ENOMEM; 1238 goto out_free; 1239 } 1240 1241 vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */ 1242 1243 vcdev->vdev.dev.parent = &cdev->dev; 1244 vcdev->vdev.dev.release = virtio_ccw_release_dev; 1245 vcdev->vdev.config = &virtio_ccw_config_ops; 1246 vcdev->cdev = cdev; 1247 init_waitqueue_head(&vcdev->wait_q); 1248 INIT_LIST_HEAD(&vcdev->virtqueues); 1249 spin_lock_init(&vcdev->lock); 1250 1251 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1252 dev_set_drvdata(&cdev->dev, vcdev); 1253 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1254 vcdev->vdev.id.vendor = cdev->id.cu_type; 1255 vcdev->vdev.id.device = cdev->id.cu_model; 1256 1257 ret = virtio_ccw_set_transport_rev(vcdev); 1258 if (ret) 1259 goto out_free; 1260 1261 ret = register_virtio_device(&vcdev->vdev); 1262 if (ret) { 1263 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n", 1264 ret); 1265 goto out_put; 1266 } 1267 return 0; 1268 out_put: 1269 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1270 dev_set_drvdata(&cdev->dev, NULL); 1271 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1272 put_device(&vcdev->vdev.dev); 1273 return ret; 1274 out_free: 1275 if (vcdev) { 1276 kfree(vcdev->status); 1277 kfree(vcdev->config_block); 1278 } 1279 kfree(vcdev); 1280 return ret; 1281 } 1282 1283 static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event) 1284 { 1285 int rc; 1286 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1287 1288 /* 1289 * Make sure vcdev is set 1290 * i.e. set_offline/remove callback not already running 1291 */ 1292 if (!vcdev) 1293 return NOTIFY_DONE; 1294 1295 switch (event) { 1296 case CIO_GONE: 1297 vcdev->device_lost = true; 1298 rc = NOTIFY_DONE; 1299 break; 1300 case CIO_OPER: 1301 rc = NOTIFY_OK; 1302 break; 1303 default: 1304 rc = NOTIFY_DONE; 1305 break; 1306 } 1307 return rc; 1308 } 1309 1310 static struct ccw_device_id virtio_ids[] = { 1311 { CCW_DEVICE(0x3832, 0) }, 1312 {}, 1313 }; 1314 1315 #ifdef CONFIG_PM_SLEEP 1316 static int virtio_ccw_freeze(struct ccw_device *cdev) 1317 { 1318 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1319 1320 return virtio_device_freeze(&vcdev->vdev); 1321 } 1322 1323 static int virtio_ccw_restore(struct ccw_device *cdev) 1324 { 1325 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1326 int ret; 1327 1328 ret = virtio_ccw_set_transport_rev(vcdev); 1329 if (ret) 1330 return ret; 1331 1332 return virtio_device_restore(&vcdev->vdev); 1333 } 1334 #endif 1335 1336 static struct ccw_driver virtio_ccw_driver = { 1337 .driver = { 1338 .owner = THIS_MODULE, 1339 .name = "virtio_ccw", 1340 }, 1341 .ids = virtio_ids, 1342 .probe = virtio_ccw_probe, 1343 .remove = virtio_ccw_remove, 1344 .set_offline = virtio_ccw_offline, 1345 .set_online = virtio_ccw_online, 1346 .notify = virtio_ccw_cio_notify, 1347 .int_class = IRQIO_VIR, 1348 #ifdef CONFIG_PM_SLEEP 1349 .freeze = virtio_ccw_freeze, 1350 .thaw = virtio_ccw_restore, 1351 .restore = virtio_ccw_restore, 1352 #endif 1353 }; 1354 1355 static int __init pure_hex(char **cp, unsigned int *val, int min_digit, 1356 int max_digit, int max_val) 1357 { 1358 int diff; 1359 1360 diff = 0; 1361 *val = 0; 1362 1363 while (diff <= max_digit) { 1364 int value = hex_to_bin(**cp); 1365 1366 if (value < 0) 1367 break; 1368 *val = *val * 16 + value; 1369 (*cp)++; 1370 diff++; 1371 } 1372 1373 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) 1374 return 1; 1375 1376 return 0; 1377 } 1378 1379 static int __init parse_busid(char *str, unsigned int *cssid, 1380 unsigned int *ssid, unsigned int *devno) 1381 { 1382 char *str_work; 1383 int rc, ret; 1384 1385 rc = 1; 1386 1387 if (*str == '\0') 1388 goto out; 1389 1390 str_work = str; 1391 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); 1392 if (ret || (str_work[0] != '.')) 1393 goto out; 1394 str_work++; 1395 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); 1396 if (ret || (str_work[0] != '.')) 1397 goto out; 1398 str_work++; 1399 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); 1400 if (ret || (str_work[0] != '\0')) 1401 goto out; 1402 1403 rc = 0; 1404 out: 1405 return rc; 1406 } 1407 1408 static void __init no_auto_parse(void) 1409 { 1410 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; 1411 char *parm, *str; 1412 int rc; 1413 1414 str = no_auto; 1415 while ((parm = strsep(&str, ","))) { 1416 rc = parse_busid(strsep(&parm, "-"), &from_cssid, 1417 &from_ssid, &from); 1418 if (rc) 1419 continue; 1420 if (parm != NULL) { 1421 rc = parse_busid(parm, &to_cssid, 1422 &to_ssid, &to); 1423 if ((from_ssid > to_ssid) || 1424 ((from_ssid == to_ssid) && (from > to))) 1425 rc = -EINVAL; 1426 } else { 1427 to_cssid = from_cssid; 1428 to_ssid = from_ssid; 1429 to = from; 1430 } 1431 if (rc) 1432 continue; 1433 while ((from_ssid < to_ssid) || 1434 ((from_ssid == to_ssid) && (from <= to))) { 1435 set_bit(from, devs_no_auto[from_ssid]); 1436 from++; 1437 if (from > __MAX_SUBCHANNEL) { 1438 from_ssid++; 1439 from = 0; 1440 } 1441 } 1442 } 1443 } 1444 1445 static int __init virtio_ccw_init(void) 1446 { 1447 /* parse no_auto string before we do anything further */ 1448 no_auto_parse(); 1449 return ccw_driver_register(&virtio_ccw_driver); 1450 } 1451 device_initcall(virtio_ccw_init); 1452