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 vcdev_dma_area { 50 unsigned long indicators; 51 unsigned long indicators2; 52 struct vq_config_block config_block; 53 __u8 status; 54 }; 55 56 struct virtio_ccw_device { 57 struct virtio_device vdev; 58 __u8 config[VIRTIO_CCW_CONFIG_SIZE]; 59 struct ccw_device *cdev; 60 __u32 curr_io; 61 int err; 62 unsigned int revision; /* Transport revision */ 63 wait_queue_head_t wait_q; 64 spinlock_t lock; 65 struct mutex io_lock; /* Serializes I/O requests */ 66 struct list_head virtqueues; 67 bool is_thinint; 68 bool going_away; 69 bool device_lost; 70 unsigned int config_ready; 71 void *airq_info; 72 struct vcdev_dma_area *dma_area; 73 }; 74 75 static inline unsigned long *indicators(struct virtio_ccw_device *vcdev) 76 { 77 return &vcdev->dma_area->indicators; 78 } 79 80 static inline unsigned long *indicators2(struct virtio_ccw_device *vcdev) 81 { 82 return &vcdev->dma_area->indicators2; 83 } 84 85 struct vq_info_block_legacy { 86 __u64 queue; 87 __u32 align; 88 __u16 index; 89 __u16 num; 90 } __packed; 91 92 struct vq_info_block { 93 __u64 desc; 94 __u32 res0; 95 __u16 index; 96 __u16 num; 97 __u64 avail; 98 __u64 used; 99 } __packed; 100 101 struct virtio_feature_desc { 102 __le32 features; 103 __u8 index; 104 } __packed; 105 106 struct virtio_thinint_area { 107 unsigned long summary_indicator; 108 unsigned long indicator; 109 u64 bit_nr; 110 u8 isc; 111 } __packed; 112 113 struct virtio_rev_info { 114 __u16 revision; 115 __u16 length; 116 __u8 data[]; 117 }; 118 119 /* the highest virtio-ccw revision we support */ 120 #define VIRTIO_CCW_REV_MAX 2 121 122 struct virtio_ccw_vq_info { 123 struct virtqueue *vq; 124 int num; 125 union { 126 struct vq_info_block s; 127 struct vq_info_block_legacy l; 128 } *info_block; 129 int bit_nr; 130 struct list_head node; 131 long cookie; 132 }; 133 134 #define VIRTIO_AIRQ_ISC IO_SCH_ISC /* inherit from subchannel */ 135 136 #define VIRTIO_IV_BITS (L1_CACHE_BYTES * 8) 137 #define MAX_AIRQ_AREAS 20 138 139 static int virtio_ccw_use_airq = 1; 140 141 struct airq_info { 142 rwlock_t lock; 143 u8 summary_indicator_idx; 144 struct airq_struct airq; 145 struct airq_iv *aiv; 146 }; 147 static struct airq_info *airq_areas[MAX_AIRQ_AREAS]; 148 static DEFINE_MUTEX(airq_areas_lock); 149 150 static u8 *summary_indicators; 151 152 static inline u8 *get_summary_indicator(struct airq_info *info) 153 { 154 return summary_indicators + info->summary_indicator_idx; 155 } 156 157 #define CCW_CMD_SET_VQ 0x13 158 #define CCW_CMD_VDEV_RESET 0x33 159 #define CCW_CMD_SET_IND 0x43 160 #define CCW_CMD_SET_CONF_IND 0x53 161 #define CCW_CMD_READ_FEAT 0x12 162 #define CCW_CMD_WRITE_FEAT 0x11 163 #define CCW_CMD_READ_CONF 0x22 164 #define CCW_CMD_WRITE_CONF 0x21 165 #define CCW_CMD_WRITE_STATUS 0x31 166 #define CCW_CMD_READ_VQ_CONF 0x32 167 #define CCW_CMD_READ_STATUS 0x72 168 #define CCW_CMD_SET_IND_ADAPTER 0x73 169 #define CCW_CMD_SET_VIRTIO_REV 0x83 170 171 #define VIRTIO_CCW_DOING_SET_VQ 0x00010000 172 #define VIRTIO_CCW_DOING_RESET 0x00040000 173 #define VIRTIO_CCW_DOING_READ_FEAT 0x00080000 174 #define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000 175 #define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000 176 #define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000 177 #define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000 178 #define VIRTIO_CCW_DOING_SET_IND 0x01000000 179 #define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000 180 #define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000 181 #define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000 182 #define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000 183 #define VIRTIO_CCW_DOING_READ_STATUS 0x20000000 184 #define VIRTIO_CCW_INTPARM_MASK 0xffff0000 185 186 static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev) 187 { 188 return container_of(vdev, struct virtio_ccw_device, vdev); 189 } 190 191 static void drop_airq_indicator(struct virtqueue *vq, struct airq_info *info) 192 { 193 unsigned long i, flags; 194 195 write_lock_irqsave(&info->lock, flags); 196 for (i = 0; i < airq_iv_end(info->aiv); i++) { 197 if (vq == (void *)airq_iv_get_ptr(info->aiv, i)) { 198 airq_iv_free_bit(info->aiv, i); 199 airq_iv_set_ptr(info->aiv, i, 0); 200 break; 201 } 202 } 203 write_unlock_irqrestore(&info->lock, flags); 204 } 205 206 static void virtio_airq_handler(struct airq_struct *airq, bool floating) 207 { 208 struct airq_info *info = container_of(airq, struct airq_info, airq); 209 unsigned long ai; 210 211 inc_irq_stat(IRQIO_VAI); 212 read_lock(&info->lock); 213 /* Walk through indicators field, summary indicator active. */ 214 for (ai = 0;;) { 215 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv)); 216 if (ai == -1UL) 217 break; 218 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai)); 219 } 220 *(get_summary_indicator(info)) = 0; 221 smp_wmb(); 222 /* Walk through indicators field, summary indicator not active. */ 223 for (ai = 0;;) { 224 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv)); 225 if (ai == -1UL) 226 break; 227 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai)); 228 } 229 read_unlock(&info->lock); 230 } 231 232 static struct airq_info *new_airq_info(int index) 233 { 234 struct airq_info *info; 235 int rc; 236 237 info = kzalloc(sizeof(*info), GFP_KERNEL); 238 if (!info) 239 return NULL; 240 rwlock_init(&info->lock); 241 info->aiv = airq_iv_create(VIRTIO_IV_BITS, AIRQ_IV_ALLOC | AIRQ_IV_PTR 242 | AIRQ_IV_CACHELINE); 243 if (!info->aiv) { 244 kfree(info); 245 return NULL; 246 } 247 info->airq.handler = virtio_airq_handler; 248 info->summary_indicator_idx = index; 249 info->airq.lsi_ptr = get_summary_indicator(info); 250 info->airq.lsi_mask = 0xff; 251 info->airq.isc = VIRTIO_AIRQ_ISC; 252 rc = register_adapter_interrupt(&info->airq); 253 if (rc) { 254 airq_iv_release(info->aiv); 255 kfree(info); 256 return NULL; 257 } 258 return info; 259 } 260 261 static unsigned long get_airq_indicator(struct virtqueue *vqs[], int nvqs, 262 u64 *first, void **airq_info) 263 { 264 int i, j; 265 struct airq_info *info; 266 unsigned long indicator_addr = 0; 267 unsigned long bit, flags; 268 269 for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) { 270 mutex_lock(&airq_areas_lock); 271 if (!airq_areas[i]) 272 airq_areas[i] = new_airq_info(i); 273 info = airq_areas[i]; 274 mutex_unlock(&airq_areas_lock); 275 if (!info) 276 return 0; 277 write_lock_irqsave(&info->lock, flags); 278 bit = airq_iv_alloc(info->aiv, nvqs); 279 if (bit == -1UL) { 280 /* Not enough vacancies. */ 281 write_unlock_irqrestore(&info->lock, flags); 282 continue; 283 } 284 *first = bit; 285 *airq_info = info; 286 indicator_addr = (unsigned long)info->aiv->vector; 287 for (j = 0; j < nvqs; j++) { 288 airq_iv_set_ptr(info->aiv, bit + j, 289 (unsigned long)vqs[j]); 290 } 291 write_unlock_irqrestore(&info->lock, flags); 292 } 293 return indicator_addr; 294 } 295 296 static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev) 297 { 298 struct virtio_ccw_vq_info *info; 299 300 if (!vcdev->airq_info) 301 return; 302 list_for_each_entry(info, &vcdev->virtqueues, node) 303 drop_airq_indicator(info->vq, vcdev->airq_info); 304 } 305 306 static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag) 307 { 308 unsigned long flags; 309 __u32 ret; 310 311 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); 312 if (vcdev->err) 313 ret = 0; 314 else 315 ret = vcdev->curr_io & flag; 316 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); 317 return ret; 318 } 319 320 static int ccw_io_helper(struct virtio_ccw_device *vcdev, 321 struct ccw1 *ccw, __u32 intparm) 322 { 323 int ret; 324 unsigned long flags; 325 int flag = intparm & VIRTIO_CCW_INTPARM_MASK; 326 327 mutex_lock(&vcdev->io_lock); 328 do { 329 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); 330 ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0); 331 if (!ret) { 332 if (!vcdev->curr_io) 333 vcdev->err = 0; 334 vcdev->curr_io |= flag; 335 } 336 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); 337 cpu_relax(); 338 } while (ret == -EBUSY); 339 wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0); 340 ret = ret ? ret : vcdev->err; 341 mutex_unlock(&vcdev->io_lock); 342 return ret; 343 } 344 345 static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev, 346 struct ccw1 *ccw) 347 { 348 int ret; 349 unsigned long *indicatorp = NULL; 350 struct virtio_thinint_area *thinint_area = NULL; 351 struct airq_info *airq_info = vcdev->airq_info; 352 353 if (vcdev->is_thinint) { 354 thinint_area = ccw_device_dma_zalloc(vcdev->cdev, 355 sizeof(*thinint_area)); 356 if (!thinint_area) 357 return; 358 thinint_area->summary_indicator = 359 (unsigned long) get_summary_indicator(airq_info); 360 thinint_area->isc = VIRTIO_AIRQ_ISC; 361 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; 362 ccw->count = sizeof(*thinint_area); 363 ccw->cda = (__u32)(unsigned long) thinint_area; 364 } else { 365 /* payload is the address of the indicators */ 366 indicatorp = ccw_device_dma_zalloc(vcdev->cdev, 367 sizeof(indicators(vcdev))); 368 if (!indicatorp) 369 return; 370 *indicatorp = 0; 371 ccw->cmd_code = CCW_CMD_SET_IND; 372 ccw->count = sizeof(indicators(vcdev)); 373 ccw->cda = (__u32)(unsigned long) indicatorp; 374 } 375 /* Deregister indicators from host. */ 376 *indicators(vcdev) = 0; 377 ccw->flags = 0; 378 ret = ccw_io_helper(vcdev, ccw, 379 vcdev->is_thinint ? 380 VIRTIO_CCW_DOING_SET_IND_ADAPTER : 381 VIRTIO_CCW_DOING_SET_IND); 382 if (ret && (ret != -ENODEV)) 383 dev_info(&vcdev->cdev->dev, 384 "Failed to deregister indicators (%d)\n", ret); 385 else if (vcdev->is_thinint) 386 virtio_ccw_drop_indicators(vcdev); 387 ccw_device_dma_free(vcdev->cdev, indicatorp, sizeof(indicators(vcdev))); 388 ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area)); 389 } 390 391 static bool virtio_ccw_kvm_notify(struct virtqueue *vq) 392 { 393 struct virtio_ccw_vq_info *info = vq->priv; 394 struct virtio_ccw_device *vcdev; 395 struct subchannel_id schid; 396 397 vcdev = to_vc_device(info->vq->vdev); 398 ccw_device_get_schid(vcdev->cdev, &schid); 399 BUILD_BUG_ON(sizeof(struct subchannel_id) != sizeof(unsigned int)); 400 info->cookie = kvm_hypercall3(KVM_S390_VIRTIO_CCW_NOTIFY, 401 *((unsigned int *)&schid), 402 vq->index, info->cookie); 403 if (info->cookie < 0) 404 return false; 405 return true; 406 } 407 408 static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev, 409 struct ccw1 *ccw, int index) 410 { 411 int ret; 412 413 vcdev->dma_area->config_block.index = index; 414 ccw->cmd_code = CCW_CMD_READ_VQ_CONF; 415 ccw->flags = 0; 416 ccw->count = sizeof(struct vq_config_block); 417 ccw->cda = (__u32)(unsigned long)(&vcdev->dma_area->config_block); 418 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF); 419 if (ret) 420 return ret; 421 return vcdev->dma_area->config_block.num ?: -ENOENT; 422 } 423 424 static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw) 425 { 426 struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev); 427 struct virtio_ccw_vq_info *info = vq->priv; 428 unsigned long flags; 429 int ret; 430 unsigned int index = vq->index; 431 432 /* Remove from our list. */ 433 spin_lock_irqsave(&vcdev->lock, flags); 434 list_del(&info->node); 435 spin_unlock_irqrestore(&vcdev->lock, flags); 436 437 /* Release from host. */ 438 if (vcdev->revision == 0) { 439 info->info_block->l.queue = 0; 440 info->info_block->l.align = 0; 441 info->info_block->l.index = index; 442 info->info_block->l.num = 0; 443 ccw->count = sizeof(info->info_block->l); 444 } else { 445 info->info_block->s.desc = 0; 446 info->info_block->s.index = index; 447 info->info_block->s.num = 0; 448 info->info_block->s.avail = 0; 449 info->info_block->s.used = 0; 450 ccw->count = sizeof(info->info_block->s); 451 } 452 ccw->cmd_code = CCW_CMD_SET_VQ; 453 ccw->flags = 0; 454 ccw->cda = (__u32)(unsigned long)(info->info_block); 455 ret = ccw_io_helper(vcdev, ccw, 456 VIRTIO_CCW_DOING_SET_VQ | index); 457 /* 458 * -ENODEV isn't considered an error: The device is gone anyway. 459 * This may happen on device detach. 460 */ 461 if (ret && (ret != -ENODEV)) 462 dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d\n", 463 ret, index); 464 465 vring_del_virtqueue(vq); 466 ccw_device_dma_free(vcdev->cdev, info->info_block, 467 sizeof(*info->info_block)); 468 kfree(info); 469 } 470 471 static void virtio_ccw_del_vqs(struct virtio_device *vdev) 472 { 473 struct virtqueue *vq, *n; 474 struct ccw1 *ccw; 475 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 476 477 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 478 if (!ccw) 479 return; 480 481 virtio_ccw_drop_indicator(vcdev, ccw); 482 483 list_for_each_entry_safe(vq, n, &vdev->vqs, list) 484 virtio_ccw_del_vq(vq, ccw); 485 486 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 487 } 488 489 static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev, 490 int i, vq_callback_t *callback, 491 const char *name, bool ctx, 492 struct ccw1 *ccw) 493 { 494 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 495 int err; 496 struct virtqueue *vq = NULL; 497 struct virtio_ccw_vq_info *info; 498 u64 queue; 499 unsigned long flags; 500 bool may_reduce; 501 502 /* Allocate queue. */ 503 info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL); 504 if (!info) { 505 dev_warn(&vcdev->cdev->dev, "no info\n"); 506 err = -ENOMEM; 507 goto out_err; 508 } 509 info->info_block = ccw_device_dma_zalloc(vcdev->cdev, 510 sizeof(*info->info_block)); 511 if (!info->info_block) { 512 dev_warn(&vcdev->cdev->dev, "no info block\n"); 513 err = -ENOMEM; 514 goto out_err; 515 } 516 info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i); 517 if (info->num < 0) { 518 err = info->num; 519 goto out_err; 520 } 521 may_reduce = vcdev->revision > 0; 522 vq = vring_create_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, 523 vdev, true, may_reduce, ctx, 524 virtio_ccw_kvm_notify, callback, name); 525 526 if (!vq) { 527 /* For now, we fail if we can't get the requested size. */ 528 dev_warn(&vcdev->cdev->dev, "no vq\n"); 529 err = -ENOMEM; 530 goto out_err; 531 } 532 /* it may have been reduced */ 533 info->num = virtqueue_get_vring_size(vq); 534 535 /* Register it with the host. */ 536 queue = virtqueue_get_desc_addr(vq); 537 if (vcdev->revision == 0) { 538 info->info_block->l.queue = queue; 539 info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN; 540 info->info_block->l.index = i; 541 info->info_block->l.num = info->num; 542 ccw->count = sizeof(info->info_block->l); 543 } else { 544 info->info_block->s.desc = queue; 545 info->info_block->s.index = i; 546 info->info_block->s.num = info->num; 547 info->info_block->s.avail = (__u64)virtqueue_get_avail_addr(vq); 548 info->info_block->s.used = (__u64)virtqueue_get_used_addr(vq); 549 ccw->count = sizeof(info->info_block->s); 550 } 551 ccw->cmd_code = CCW_CMD_SET_VQ; 552 ccw->flags = 0; 553 ccw->cda = (__u32)(unsigned long)(info->info_block); 554 err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i); 555 if (err) { 556 dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n"); 557 goto out_err; 558 } 559 560 info->vq = vq; 561 vq->priv = info; 562 563 /* Save it to our list. */ 564 spin_lock_irqsave(&vcdev->lock, flags); 565 list_add(&info->node, &vcdev->virtqueues); 566 spin_unlock_irqrestore(&vcdev->lock, flags); 567 568 return vq; 569 570 out_err: 571 if (vq) 572 vring_del_virtqueue(vq); 573 if (info) { 574 ccw_device_dma_free(vcdev->cdev, info->info_block, 575 sizeof(*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 = ccw_device_dma_zalloc(vcdev->cdev, 590 sizeof(*thinint_area)); 591 if (!thinint_area) { 592 ret = -ENOMEM; 593 goto out; 594 } 595 /* Try to get an indicator. */ 596 thinint_area->indicator = get_airq_indicator(vqs, nvqs, 597 &thinint_area->bit_nr, 598 &vcdev->airq_info); 599 if (!thinint_area->indicator) { 600 ret = -ENOSPC; 601 goto out; 602 } 603 info = vcdev->airq_info; 604 thinint_area->summary_indicator = 605 (unsigned long) get_summary_indicator(info); 606 thinint_area->isc = VIRTIO_AIRQ_ISC; 607 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; 608 ccw->flags = CCW_FLAG_SLI; 609 ccw->count = sizeof(*thinint_area); 610 ccw->cda = (__u32)(unsigned long)thinint_area; 611 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER); 612 if (ret) { 613 if (ret == -EOPNOTSUPP) { 614 /* 615 * The host does not support adapter interrupts 616 * for virtio-ccw, stop trying. 617 */ 618 virtio_ccw_use_airq = 0; 619 pr_info("Adapter interrupts unsupported on host\n"); 620 } else 621 dev_warn(&vcdev->cdev->dev, 622 "enabling adapter interrupts = %d\n", ret); 623 virtio_ccw_drop_indicators(vcdev); 624 } 625 out: 626 ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area)); 627 return ret; 628 } 629 630 static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, 631 struct virtqueue *vqs[], 632 vq_callback_t *callbacks[], 633 const char * const names[], 634 const bool *ctx, 635 struct irq_affinity *desc) 636 { 637 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 638 unsigned long *indicatorp = NULL; 639 int ret, i, queue_idx = 0; 640 struct ccw1 *ccw; 641 642 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 643 if (!ccw) 644 return -ENOMEM; 645 646 for (i = 0; i < nvqs; ++i) { 647 if (!names[i]) { 648 vqs[i] = NULL; 649 continue; 650 } 651 652 vqs[i] = virtio_ccw_setup_vq(vdev, queue_idx++, callbacks[i], 653 names[i], ctx ? ctx[i] : false, 654 ccw); 655 if (IS_ERR(vqs[i])) { 656 ret = PTR_ERR(vqs[i]); 657 vqs[i] = NULL; 658 goto out; 659 } 660 } 661 ret = -ENOMEM; 662 /* 663 * We need a data area under 2G to communicate. Our payload is 664 * the address of the indicators. 665 */ 666 indicatorp = ccw_device_dma_zalloc(vcdev->cdev, 667 sizeof(indicators(vcdev))); 668 if (!indicatorp) 669 goto out; 670 *indicatorp = (unsigned long) indicators(vcdev); 671 if (vcdev->is_thinint) { 672 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw); 673 if (ret) 674 /* no error, just fall back to legacy interrupts */ 675 vcdev->is_thinint = false; 676 } 677 if (!vcdev->is_thinint) { 678 /* Register queue indicators with host. */ 679 *indicators(vcdev) = 0; 680 ccw->cmd_code = CCW_CMD_SET_IND; 681 ccw->flags = 0; 682 ccw->count = sizeof(indicators(vcdev)); 683 ccw->cda = (__u32)(unsigned long) indicatorp; 684 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND); 685 if (ret) 686 goto out; 687 } 688 /* Register indicators2 with host for config changes */ 689 *indicatorp = (unsigned long) indicators2(vcdev); 690 *indicators2(vcdev) = 0; 691 ccw->cmd_code = CCW_CMD_SET_CONF_IND; 692 ccw->flags = 0; 693 ccw->count = sizeof(indicators2(vcdev)); 694 ccw->cda = (__u32)(unsigned long) indicatorp; 695 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND); 696 if (ret) 697 goto out; 698 699 if (indicatorp) 700 ccw_device_dma_free(vcdev->cdev, indicatorp, 701 sizeof(indicators(vcdev))); 702 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 703 return 0; 704 out: 705 if (indicatorp) 706 ccw_device_dma_free(vcdev->cdev, indicatorp, 707 sizeof(indicators(vcdev))); 708 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 709 virtio_ccw_del_vqs(vdev); 710 return ret; 711 } 712 713 static void virtio_ccw_reset(struct virtio_device *vdev) 714 { 715 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 716 struct ccw1 *ccw; 717 718 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 719 if (!ccw) 720 return; 721 722 /* Zero status bits. */ 723 vcdev->dma_area->status = 0; 724 725 /* Send a reset ccw on device. */ 726 ccw->cmd_code = CCW_CMD_VDEV_RESET; 727 ccw->flags = 0; 728 ccw->count = 0; 729 ccw->cda = 0; 730 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET); 731 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 732 } 733 734 static u64 virtio_ccw_get_features(struct virtio_device *vdev) 735 { 736 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 737 struct virtio_feature_desc *features; 738 int ret; 739 u64 rc; 740 struct ccw1 *ccw; 741 742 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 743 if (!ccw) 744 return 0; 745 746 features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features)); 747 if (!features) { 748 rc = 0; 749 goto out_free; 750 } 751 /* Read the feature bits from the host. */ 752 features->index = 0; 753 ccw->cmd_code = CCW_CMD_READ_FEAT; 754 ccw->flags = 0; 755 ccw->count = sizeof(*features); 756 ccw->cda = (__u32)(unsigned long)features; 757 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 758 if (ret) { 759 rc = 0; 760 goto out_free; 761 } 762 763 rc = le32_to_cpu(features->features); 764 765 if (vcdev->revision == 0) 766 goto out_free; 767 768 /* Read second half of the feature bits from the host. */ 769 features->index = 1; 770 ccw->cmd_code = CCW_CMD_READ_FEAT; 771 ccw->flags = 0; 772 ccw->count = sizeof(*features); 773 ccw->cda = (__u32)(unsigned long)features; 774 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 775 if (ret == 0) 776 rc |= (u64)le32_to_cpu(features->features) << 32; 777 778 out_free: 779 ccw_device_dma_free(vcdev->cdev, features, sizeof(*features)); 780 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 781 return rc; 782 } 783 784 static void ccw_transport_features(struct virtio_device *vdev) 785 { 786 /* 787 * Currently nothing to do here. 788 */ 789 } 790 791 static int virtio_ccw_finalize_features(struct virtio_device *vdev) 792 { 793 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 794 struct virtio_feature_desc *features; 795 struct ccw1 *ccw; 796 int ret; 797 798 if (vcdev->revision >= 1 && 799 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { 800 dev_err(&vdev->dev, "virtio: device uses revision 1 " 801 "but does not have VIRTIO_F_VERSION_1\n"); 802 return -EINVAL; 803 } 804 805 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 806 if (!ccw) 807 return -ENOMEM; 808 809 features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features)); 810 if (!features) { 811 ret = -ENOMEM; 812 goto out_free; 813 } 814 /* Give virtio_ring a chance to accept features. */ 815 vring_transport_features(vdev); 816 817 /* Give virtio_ccw a chance to accept features. */ 818 ccw_transport_features(vdev); 819 820 features->index = 0; 821 features->features = cpu_to_le32((u32)vdev->features); 822 /* Write the first half of the feature bits to the host. */ 823 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 824 ccw->flags = 0; 825 ccw->count = sizeof(*features); 826 ccw->cda = (__u32)(unsigned long)features; 827 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 828 if (ret) 829 goto out_free; 830 831 if (vcdev->revision == 0) 832 goto out_free; 833 834 features->index = 1; 835 features->features = cpu_to_le32(vdev->features >> 32); 836 /* Write the second half of the feature bits to the host. */ 837 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 838 ccw->flags = 0; 839 ccw->count = sizeof(*features); 840 ccw->cda = (__u32)(unsigned long)features; 841 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 842 843 out_free: 844 ccw_device_dma_free(vcdev->cdev, features, sizeof(*features)); 845 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 846 847 return ret; 848 } 849 850 static void virtio_ccw_get_config(struct virtio_device *vdev, 851 unsigned int offset, void *buf, unsigned len) 852 { 853 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 854 int ret; 855 struct ccw1 *ccw; 856 void *config_area; 857 unsigned long flags; 858 859 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 860 if (!ccw) 861 return; 862 863 config_area = ccw_device_dma_zalloc(vcdev->cdev, 864 VIRTIO_CCW_CONFIG_SIZE); 865 if (!config_area) 866 goto out_free; 867 868 /* Read the config area from the host. */ 869 ccw->cmd_code = CCW_CMD_READ_CONF; 870 ccw->flags = 0; 871 ccw->count = offset + len; 872 ccw->cda = (__u32)(unsigned long)config_area; 873 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG); 874 if (ret) 875 goto out_free; 876 877 spin_lock_irqsave(&vcdev->lock, flags); 878 memcpy(vcdev->config, config_area, offset + len); 879 if (vcdev->config_ready < offset + len) 880 vcdev->config_ready = offset + len; 881 spin_unlock_irqrestore(&vcdev->lock, flags); 882 if (buf) 883 memcpy(buf, config_area + offset, len); 884 885 out_free: 886 ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE); 887 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 888 } 889 890 static void virtio_ccw_set_config(struct virtio_device *vdev, 891 unsigned int offset, const void *buf, 892 unsigned len) 893 { 894 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 895 struct ccw1 *ccw; 896 void *config_area; 897 unsigned long flags; 898 899 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 900 if (!ccw) 901 return; 902 903 config_area = ccw_device_dma_zalloc(vcdev->cdev, 904 VIRTIO_CCW_CONFIG_SIZE); 905 if (!config_area) 906 goto out_free; 907 908 /* Make sure we don't overwrite fields. */ 909 if (vcdev->config_ready < offset) 910 virtio_ccw_get_config(vdev, 0, NULL, offset); 911 spin_lock_irqsave(&vcdev->lock, flags); 912 memcpy(&vcdev->config[offset], buf, len); 913 /* Write the config area to the host. */ 914 memcpy(config_area, vcdev->config, sizeof(vcdev->config)); 915 spin_unlock_irqrestore(&vcdev->lock, flags); 916 ccw->cmd_code = CCW_CMD_WRITE_CONF; 917 ccw->flags = 0; 918 ccw->count = offset + len; 919 ccw->cda = (__u32)(unsigned long)config_area; 920 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG); 921 922 out_free: 923 ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE); 924 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 925 } 926 927 static u8 virtio_ccw_get_status(struct virtio_device *vdev) 928 { 929 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 930 u8 old_status = vcdev->dma_area->status; 931 struct ccw1 *ccw; 932 933 if (vcdev->revision < 2) 934 return vcdev->dma_area->status; 935 936 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 937 if (!ccw) 938 return old_status; 939 940 ccw->cmd_code = CCW_CMD_READ_STATUS; 941 ccw->flags = 0; 942 ccw->count = sizeof(vcdev->dma_area->status); 943 ccw->cda = (__u32)(unsigned long)&vcdev->dma_area->status; 944 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS); 945 /* 946 * If the channel program failed (should only happen if the device 947 * was hotunplugged, and then we clean up via the machine check 948 * handler anyway), vcdev->dma_area->status was not overwritten and we just 949 * return the old status, which is fine. 950 */ 951 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 952 953 return vcdev->dma_area->status; 954 } 955 956 static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status) 957 { 958 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 959 u8 old_status = vcdev->dma_area->status; 960 struct ccw1 *ccw; 961 int ret; 962 963 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 964 if (!ccw) 965 return; 966 967 /* Write the status to the host. */ 968 vcdev->dma_area->status = status; 969 ccw->cmd_code = CCW_CMD_WRITE_STATUS; 970 ccw->flags = 0; 971 ccw->count = sizeof(status); 972 ccw->cda = (__u32)(unsigned long)&vcdev->dma_area->status; 973 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS); 974 /* Write failed? We assume status is unchanged. */ 975 if (ret) 976 vcdev->dma_area->status = old_status; 977 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 978 } 979 980 static const char *virtio_ccw_bus_name(struct virtio_device *vdev) 981 { 982 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 983 984 return dev_name(&vcdev->cdev->dev); 985 } 986 987 static const struct virtio_config_ops virtio_ccw_config_ops = { 988 .get_features = virtio_ccw_get_features, 989 .finalize_features = virtio_ccw_finalize_features, 990 .get = virtio_ccw_get_config, 991 .set = virtio_ccw_set_config, 992 .get_status = virtio_ccw_get_status, 993 .set_status = virtio_ccw_set_status, 994 .reset = virtio_ccw_reset, 995 .find_vqs = virtio_ccw_find_vqs, 996 .del_vqs = virtio_ccw_del_vqs, 997 .bus_name = virtio_ccw_bus_name, 998 }; 999 1000 1001 /* 1002 * ccw bus driver related functions 1003 */ 1004 1005 static void virtio_ccw_release_dev(struct device *_d) 1006 { 1007 struct virtio_device *dev = dev_to_virtio(_d); 1008 struct virtio_ccw_device *vcdev = to_vc_device(dev); 1009 1010 ccw_device_dma_free(vcdev->cdev, vcdev->dma_area, 1011 sizeof(*vcdev->dma_area)); 1012 kfree(vcdev); 1013 } 1014 1015 static int irb_is_error(struct irb *irb) 1016 { 1017 if (scsw_cstat(&irb->scsw) != 0) 1018 return 1; 1019 if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) 1020 return 1; 1021 if (scsw_cc(&irb->scsw) != 0) 1022 return 1; 1023 return 0; 1024 } 1025 1026 static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev, 1027 int index) 1028 { 1029 struct virtio_ccw_vq_info *info; 1030 unsigned long flags; 1031 struct virtqueue *vq; 1032 1033 vq = NULL; 1034 spin_lock_irqsave(&vcdev->lock, flags); 1035 list_for_each_entry(info, &vcdev->virtqueues, node) { 1036 if (info->vq->index == index) { 1037 vq = info->vq; 1038 break; 1039 } 1040 } 1041 spin_unlock_irqrestore(&vcdev->lock, flags); 1042 return vq; 1043 } 1044 1045 static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev, 1046 __u32 activity) 1047 { 1048 if (vcdev->curr_io & activity) { 1049 switch (activity) { 1050 case VIRTIO_CCW_DOING_READ_FEAT: 1051 case VIRTIO_CCW_DOING_WRITE_FEAT: 1052 case VIRTIO_CCW_DOING_READ_CONFIG: 1053 case VIRTIO_CCW_DOING_WRITE_CONFIG: 1054 case VIRTIO_CCW_DOING_WRITE_STATUS: 1055 case VIRTIO_CCW_DOING_READ_STATUS: 1056 case VIRTIO_CCW_DOING_SET_VQ: 1057 case VIRTIO_CCW_DOING_SET_IND: 1058 case VIRTIO_CCW_DOING_SET_CONF_IND: 1059 case VIRTIO_CCW_DOING_RESET: 1060 case VIRTIO_CCW_DOING_READ_VQ_CONF: 1061 case VIRTIO_CCW_DOING_SET_IND_ADAPTER: 1062 case VIRTIO_CCW_DOING_SET_VIRTIO_REV: 1063 vcdev->curr_io &= ~activity; 1064 wake_up(&vcdev->wait_q); 1065 break; 1066 default: 1067 /* don't know what to do... */ 1068 dev_warn(&vcdev->cdev->dev, 1069 "Suspicious activity '%08x'\n", activity); 1070 WARN_ON(1); 1071 break; 1072 } 1073 } 1074 } 1075 1076 static void virtio_ccw_int_handler(struct ccw_device *cdev, 1077 unsigned long intparm, 1078 struct irb *irb) 1079 { 1080 __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK; 1081 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1082 int i; 1083 struct virtqueue *vq; 1084 1085 if (!vcdev) 1086 return; 1087 if (IS_ERR(irb)) { 1088 vcdev->err = PTR_ERR(irb); 1089 virtio_ccw_check_activity(vcdev, activity); 1090 /* Don't poke around indicators, something's wrong. */ 1091 return; 1092 } 1093 /* Check if it's a notification from the host. */ 1094 if ((intparm == 0) && 1095 (scsw_stctl(&irb->scsw) == 1096 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) { 1097 /* OK */ 1098 } 1099 if (irb_is_error(irb)) { 1100 /* Command reject? */ 1101 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) && 1102 (irb->ecw[0] & SNS0_CMD_REJECT)) 1103 vcdev->err = -EOPNOTSUPP; 1104 else 1105 /* Map everything else to -EIO. */ 1106 vcdev->err = -EIO; 1107 } 1108 virtio_ccw_check_activity(vcdev, activity); 1109 for_each_set_bit(i, indicators(vcdev), 1110 sizeof(*indicators(vcdev)) * BITS_PER_BYTE) { 1111 /* The bit clear must happen before the vring kick. */ 1112 clear_bit(i, indicators(vcdev)); 1113 barrier(); 1114 vq = virtio_ccw_vq_by_ind(vcdev, i); 1115 vring_interrupt(0, vq); 1116 } 1117 if (test_bit(0, indicators2(vcdev))) { 1118 virtio_config_changed(&vcdev->vdev); 1119 clear_bit(0, indicators2(vcdev)); 1120 } 1121 } 1122 1123 /* 1124 * We usually want to autoonline all devices, but give the admin 1125 * a way to exempt devices from this. 1126 */ 1127 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ 1128 (8*sizeof(long))) 1129 static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS]; 1130 1131 static char *no_auto = ""; 1132 1133 module_param(no_auto, charp, 0444); 1134 MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined"); 1135 1136 static int virtio_ccw_check_autoonline(struct ccw_device *cdev) 1137 { 1138 struct ccw_dev_id id; 1139 1140 ccw_device_get_id(cdev, &id); 1141 if (test_bit(id.devno, devs_no_auto[id.ssid])) 1142 return 0; 1143 return 1; 1144 } 1145 1146 static void virtio_ccw_auto_online(void *data, async_cookie_t cookie) 1147 { 1148 struct ccw_device *cdev = data; 1149 int ret; 1150 1151 ret = ccw_device_set_online(cdev); 1152 if (ret) 1153 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret); 1154 } 1155 1156 static int virtio_ccw_probe(struct ccw_device *cdev) 1157 { 1158 cdev->handler = virtio_ccw_int_handler; 1159 1160 if (virtio_ccw_check_autoonline(cdev)) 1161 async_schedule(virtio_ccw_auto_online, cdev); 1162 return 0; 1163 } 1164 1165 static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev) 1166 { 1167 unsigned long flags; 1168 struct virtio_ccw_device *vcdev; 1169 1170 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1171 vcdev = dev_get_drvdata(&cdev->dev); 1172 if (!vcdev || vcdev->going_away) { 1173 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1174 return NULL; 1175 } 1176 vcdev->going_away = true; 1177 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1178 return vcdev; 1179 } 1180 1181 static void virtio_ccw_remove(struct ccw_device *cdev) 1182 { 1183 unsigned long flags; 1184 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1185 1186 if (vcdev && cdev->online) { 1187 if (vcdev->device_lost) 1188 virtio_break_device(&vcdev->vdev); 1189 unregister_virtio_device(&vcdev->vdev); 1190 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1191 dev_set_drvdata(&cdev->dev, NULL); 1192 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1193 } 1194 cdev->handler = NULL; 1195 } 1196 1197 static int virtio_ccw_offline(struct ccw_device *cdev) 1198 { 1199 unsigned long flags; 1200 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1201 1202 if (!vcdev) 1203 return 0; 1204 if (vcdev->device_lost) 1205 virtio_break_device(&vcdev->vdev); 1206 unregister_virtio_device(&vcdev->vdev); 1207 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1208 dev_set_drvdata(&cdev->dev, NULL); 1209 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1210 return 0; 1211 } 1212 1213 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev) 1214 { 1215 struct virtio_rev_info *rev; 1216 struct ccw1 *ccw; 1217 int ret; 1218 1219 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 1220 if (!ccw) 1221 return -ENOMEM; 1222 rev = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*rev)); 1223 if (!rev) { 1224 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 1225 return -ENOMEM; 1226 } 1227 1228 /* Set transport revision */ 1229 ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV; 1230 ccw->flags = 0; 1231 ccw->count = sizeof(*rev); 1232 ccw->cda = (__u32)(unsigned long)rev; 1233 1234 vcdev->revision = VIRTIO_CCW_REV_MAX; 1235 do { 1236 rev->revision = vcdev->revision; 1237 /* none of our supported revisions carry payload */ 1238 rev->length = 0; 1239 ret = ccw_io_helper(vcdev, ccw, 1240 VIRTIO_CCW_DOING_SET_VIRTIO_REV); 1241 if (ret == -EOPNOTSUPP) { 1242 if (vcdev->revision == 0) 1243 /* 1244 * The host device does not support setting 1245 * the revision: let's operate it in legacy 1246 * mode. 1247 */ 1248 ret = 0; 1249 else 1250 vcdev->revision--; 1251 } 1252 } while (ret == -EOPNOTSUPP); 1253 1254 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 1255 ccw_device_dma_free(vcdev->cdev, rev, sizeof(*rev)); 1256 return ret; 1257 } 1258 1259 static int virtio_ccw_online(struct ccw_device *cdev) 1260 { 1261 int ret; 1262 struct virtio_ccw_device *vcdev; 1263 unsigned long flags; 1264 1265 vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL); 1266 if (!vcdev) { 1267 dev_warn(&cdev->dev, "Could not get memory for virtio\n"); 1268 ret = -ENOMEM; 1269 goto out_free; 1270 } 1271 vcdev->vdev.dev.parent = &cdev->dev; 1272 vcdev->cdev = cdev; 1273 vcdev->dma_area = ccw_device_dma_zalloc(vcdev->cdev, 1274 sizeof(*vcdev->dma_area)); 1275 if (!vcdev->dma_area) { 1276 ret = -ENOMEM; 1277 goto out_free; 1278 } 1279 1280 vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */ 1281 1282 vcdev->vdev.dev.release = virtio_ccw_release_dev; 1283 vcdev->vdev.config = &virtio_ccw_config_ops; 1284 init_waitqueue_head(&vcdev->wait_q); 1285 INIT_LIST_HEAD(&vcdev->virtqueues); 1286 spin_lock_init(&vcdev->lock); 1287 mutex_init(&vcdev->io_lock); 1288 1289 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1290 dev_set_drvdata(&cdev->dev, vcdev); 1291 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1292 vcdev->vdev.id.vendor = cdev->id.cu_type; 1293 vcdev->vdev.id.device = cdev->id.cu_model; 1294 1295 ret = virtio_ccw_set_transport_rev(vcdev); 1296 if (ret) 1297 goto out_free; 1298 1299 ret = register_virtio_device(&vcdev->vdev); 1300 if (ret) { 1301 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n", 1302 ret); 1303 goto out_put; 1304 } 1305 return 0; 1306 out_put: 1307 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1308 dev_set_drvdata(&cdev->dev, NULL); 1309 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1310 put_device(&vcdev->vdev.dev); 1311 return ret; 1312 out_free: 1313 if (vcdev) { 1314 ccw_device_dma_free(vcdev->cdev, vcdev->dma_area, 1315 sizeof(*vcdev->dma_area)); 1316 } 1317 kfree(vcdev); 1318 return ret; 1319 } 1320 1321 static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event) 1322 { 1323 int rc; 1324 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1325 1326 /* 1327 * Make sure vcdev is set 1328 * i.e. set_offline/remove callback not already running 1329 */ 1330 if (!vcdev) 1331 return NOTIFY_DONE; 1332 1333 switch (event) { 1334 case CIO_GONE: 1335 vcdev->device_lost = true; 1336 rc = NOTIFY_DONE; 1337 break; 1338 case CIO_OPER: 1339 rc = NOTIFY_OK; 1340 break; 1341 default: 1342 rc = NOTIFY_DONE; 1343 break; 1344 } 1345 return rc; 1346 } 1347 1348 static struct ccw_device_id virtio_ids[] = { 1349 { CCW_DEVICE(0x3832, 0) }, 1350 {}, 1351 }; 1352 1353 static struct ccw_driver virtio_ccw_driver = { 1354 .driver = { 1355 .owner = THIS_MODULE, 1356 .name = "virtio_ccw", 1357 }, 1358 .ids = virtio_ids, 1359 .probe = virtio_ccw_probe, 1360 .remove = virtio_ccw_remove, 1361 .set_offline = virtio_ccw_offline, 1362 .set_online = virtio_ccw_online, 1363 .notify = virtio_ccw_cio_notify, 1364 .int_class = IRQIO_VIR, 1365 }; 1366 1367 static int __init pure_hex(char **cp, unsigned int *val, int min_digit, 1368 int max_digit, int max_val) 1369 { 1370 int diff; 1371 1372 diff = 0; 1373 *val = 0; 1374 1375 while (diff <= max_digit) { 1376 int value = hex_to_bin(**cp); 1377 1378 if (value < 0) 1379 break; 1380 *val = *val * 16 + value; 1381 (*cp)++; 1382 diff++; 1383 } 1384 1385 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) 1386 return 1; 1387 1388 return 0; 1389 } 1390 1391 static int __init parse_busid(char *str, unsigned int *cssid, 1392 unsigned int *ssid, unsigned int *devno) 1393 { 1394 char *str_work; 1395 int rc, ret; 1396 1397 rc = 1; 1398 1399 if (*str == '\0') 1400 goto out; 1401 1402 str_work = str; 1403 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); 1404 if (ret || (str_work[0] != '.')) 1405 goto out; 1406 str_work++; 1407 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); 1408 if (ret || (str_work[0] != '.')) 1409 goto out; 1410 str_work++; 1411 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); 1412 if (ret || (str_work[0] != '\0')) 1413 goto out; 1414 1415 rc = 0; 1416 out: 1417 return rc; 1418 } 1419 1420 static void __init no_auto_parse(void) 1421 { 1422 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; 1423 char *parm, *str; 1424 int rc; 1425 1426 str = no_auto; 1427 while ((parm = strsep(&str, ","))) { 1428 rc = parse_busid(strsep(&parm, "-"), &from_cssid, 1429 &from_ssid, &from); 1430 if (rc) 1431 continue; 1432 if (parm != NULL) { 1433 rc = parse_busid(parm, &to_cssid, 1434 &to_ssid, &to); 1435 if ((from_ssid > to_ssid) || 1436 ((from_ssid == to_ssid) && (from > to))) 1437 rc = -EINVAL; 1438 } else { 1439 to_cssid = from_cssid; 1440 to_ssid = from_ssid; 1441 to = from; 1442 } 1443 if (rc) 1444 continue; 1445 while ((from_ssid < to_ssid) || 1446 ((from_ssid == to_ssid) && (from <= to))) { 1447 set_bit(from, devs_no_auto[from_ssid]); 1448 from++; 1449 if (from > __MAX_SUBCHANNEL) { 1450 from_ssid++; 1451 from = 0; 1452 } 1453 } 1454 } 1455 } 1456 1457 static int __init virtio_ccw_init(void) 1458 { 1459 int rc; 1460 1461 /* parse no_auto string before we do anything further */ 1462 no_auto_parse(); 1463 1464 summary_indicators = cio_dma_zalloc(MAX_AIRQ_AREAS); 1465 if (!summary_indicators) 1466 return -ENOMEM; 1467 rc = ccw_driver_register(&virtio_ccw_driver); 1468 if (rc) 1469 cio_dma_free(summary_indicators, MAX_AIRQ_AREAS); 1470 return rc; 1471 } 1472 device_initcall(virtio_ccw_init); 1473