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#include <asm/tpi.h> 37 38/* 39 * virtio related functions 40 */ 41 42struct vq_config_block { 43 __u16 index; 44 __u16 num; 45} __packed; 46 47#define VIRTIO_CCW_CONFIG_SIZE 0x100 48/* same as PCI config space size, should be enough for all drivers */ 49 50struct vcdev_dma_area { 51 unsigned long indicators; 52 unsigned long indicators2; 53 struct vq_config_block config_block; 54 __u8 status; 55}; 56 57struct virtio_ccw_device { 58 struct virtio_device vdev; 59 __u8 config[VIRTIO_CCW_CONFIG_SIZE]; 60 struct ccw_device *cdev; 61 __u32 curr_io; 62 int err; 63 unsigned int revision; /* Transport revision */ 64 wait_queue_head_t wait_q; 65 spinlock_t lock; 66 rwlock_t irq_lock; 67 struct mutex io_lock; /* Serializes I/O requests */ 68 struct list_head virtqueues; 69 bool is_thinint; 70 bool going_away; 71 bool device_lost; 72 unsigned int config_ready; 73 void *airq_info; 74 struct vcdev_dma_area *dma_area; 75}; 76 77static inline unsigned long *indicators(struct virtio_ccw_device *vcdev) 78{ 79 return &vcdev->dma_area->indicators; 80} 81 82static inline unsigned long *indicators2(struct virtio_ccw_device *vcdev) 83{ 84 return &vcdev->dma_area->indicators2; 85} 86 87struct vq_info_block_legacy { 88 __u64 queue; 89 __u32 align; 90 __u16 index; 91 __u16 num; 92} __packed; 93 94struct vq_info_block { 95 __u64 desc; 96 __u32 res0; 97 __u16 index; 98 __u16 num; 99 __u64 avail; 100 __u64 used; 101} __packed; 102 103struct virtio_feature_desc { 104 __le32 features; 105 __u8 index; 106} __packed; 107 108struct virtio_thinint_area { 109 unsigned long summary_indicator; 110 unsigned long indicator; 111 u64 bit_nr; 112 u8 isc; 113} __packed; 114 115struct virtio_rev_info { 116 __u16 revision; 117 __u16 length; 118 __u8 data[]; 119}; 120 121/* the highest virtio-ccw revision we support */ 122#define VIRTIO_CCW_REV_MAX 2 123 124struct virtio_ccw_vq_info { 125 struct virtqueue *vq; 126 int num; 127 union { 128 struct vq_info_block s; 129 struct vq_info_block_legacy l; 130 } *info_block; 131 int bit_nr; 132 struct list_head node; 133 long cookie; 134}; 135 136#define VIRTIO_AIRQ_ISC IO_SCH_ISC /* inherit from subchannel */ 137 138#define VIRTIO_IV_BITS (L1_CACHE_BYTES * 8) 139#define MAX_AIRQ_AREAS 20 140 141static int virtio_ccw_use_airq = 1; 142 143struct airq_info { 144 rwlock_t lock; 145 u8 summary_indicator_idx; 146 struct airq_struct airq; 147 struct airq_iv *aiv; 148}; 149static struct airq_info *airq_areas[MAX_AIRQ_AREAS]; 150static DEFINE_MUTEX(airq_areas_lock); 151 152static u8 *summary_indicators; 153 154static inline u8 *get_summary_indicator(struct airq_info *info) 155{ 156 return summary_indicators + info->summary_indicator_idx; 157} 158 159#define CCW_CMD_SET_VQ 0x13 160#define CCW_CMD_VDEV_RESET 0x33 161#define CCW_CMD_SET_IND 0x43 162#define CCW_CMD_SET_CONF_IND 0x53 163#define CCW_CMD_READ_FEAT 0x12 164#define CCW_CMD_WRITE_FEAT 0x11 165#define CCW_CMD_READ_CONF 0x22 166#define CCW_CMD_WRITE_CONF 0x21 167#define CCW_CMD_WRITE_STATUS 0x31 168#define CCW_CMD_READ_VQ_CONF 0x32 169#define CCW_CMD_READ_STATUS 0x72 170#define CCW_CMD_SET_IND_ADAPTER 0x73 171#define CCW_CMD_SET_VIRTIO_REV 0x83 172 173#define VIRTIO_CCW_DOING_SET_VQ 0x00010000 174#define VIRTIO_CCW_DOING_RESET 0x00040000 175#define VIRTIO_CCW_DOING_READ_FEAT 0x00080000 176#define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000 177#define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000 178#define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000 179#define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000 180#define VIRTIO_CCW_DOING_SET_IND 0x01000000 181#define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000 182#define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000 183#define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000 184#define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000 185#define VIRTIO_CCW_DOING_READ_STATUS 0x20000000 186#define VIRTIO_CCW_INTPARM_MASK 0xffff0000 187 188static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev) 189{ 190 return container_of(vdev, struct virtio_ccw_device, vdev); 191} 192 193static void drop_airq_indicator(struct virtqueue *vq, struct airq_info *info) 194{ 195 unsigned long i, flags; 196 197 write_lock_irqsave(&info->lock, flags); 198 for (i = 0; i < airq_iv_end(info->aiv); i++) { 199 if (vq == (void *)airq_iv_get_ptr(info->aiv, i)) { 200 airq_iv_free_bit(info->aiv, i); 201 airq_iv_set_ptr(info->aiv, i, 0); 202 break; 203 } 204 } 205 write_unlock_irqrestore(&info->lock, flags); 206} 207 208static void virtio_airq_handler(struct airq_struct *airq, 209 struct tpi_info *tpi_info) 210{ 211 struct airq_info *info = container_of(airq, struct airq_info, airq); 212 unsigned long ai; 213 214 inc_irq_stat(IRQIO_VAI); 215 read_lock(&info->lock); 216 /* Walk through indicators field, summary indicator active. */ 217 for (ai = 0;;) { 218 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv)); 219 if (ai == -1UL) 220 break; 221 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai)); 222 } 223 *(get_summary_indicator(info)) = 0; 224 smp_wmb(); 225 /* Walk through indicators field, summary indicator not active. */ 226 for (ai = 0;;) { 227 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv)); 228 if (ai == -1UL) 229 break; 230 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai)); 231 } 232 read_unlock(&info->lock); 233} 234 235static struct airq_info *new_airq_info(int index) 236{ 237 struct airq_info *info; 238 int rc; 239 240 info = kzalloc(sizeof(*info), GFP_KERNEL); 241 if (!info) 242 return NULL; 243 rwlock_init(&info->lock); 244 info->aiv = airq_iv_create(VIRTIO_IV_BITS, AIRQ_IV_ALLOC | AIRQ_IV_PTR 245 | AIRQ_IV_CACHELINE, NULL); 246 if (!info->aiv) { 247 kfree(info); 248 return NULL; 249 } 250 info->airq.handler = virtio_airq_handler; 251 info->summary_indicator_idx = index; 252 info->airq.lsi_ptr = get_summary_indicator(info); 253 info->airq.isc = VIRTIO_AIRQ_ISC; 254 rc = register_adapter_interrupt(&info->airq); 255 if (rc) { 256 airq_iv_release(info->aiv); 257 kfree(info); 258 return NULL; 259 } 260 return info; 261} 262 263static unsigned long get_airq_indicator(struct virtqueue *vqs[], int nvqs, 264 u64 *first, void **airq_info) 265{ 266 int i, j; 267 struct airq_info *info; 268 unsigned long indicator_addr = 0; 269 unsigned long bit, flags; 270 271 for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) { 272 mutex_lock(&airq_areas_lock); 273 if (!airq_areas[i]) 274 airq_areas[i] = new_airq_info(i); 275 info = airq_areas[i]; 276 mutex_unlock(&airq_areas_lock); 277 if (!info) 278 return 0; 279 write_lock_irqsave(&info->lock, flags); 280 bit = airq_iv_alloc(info->aiv, nvqs); 281 if (bit == -1UL) { 282 /* Not enough vacancies. */ 283 write_unlock_irqrestore(&info->lock, flags); 284 continue; 285 } 286 *first = bit; 287 *airq_info = info; 288 indicator_addr = (unsigned long)info->aiv->vector; 289 for (j = 0; j < nvqs; j++) { 290 airq_iv_set_ptr(info->aiv, bit + j, 291 (unsigned long)vqs[j]); 292 } 293 write_unlock_irqrestore(&info->lock, flags); 294 } 295 return indicator_addr; 296} 297 298static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev) 299{ 300 struct virtio_ccw_vq_info *info; 301 302 if (!vcdev->airq_info) 303 return; 304 list_for_each_entry(info, &vcdev->virtqueues, node) 305 drop_airq_indicator(info->vq, vcdev->airq_info); 306} 307 308static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag) 309{ 310 unsigned long flags; 311 __u32 ret; 312 313 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); 314 if (vcdev->err) 315 ret = 0; 316 else 317 ret = vcdev->curr_io & flag; 318 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); 319 return ret; 320} 321 322static int ccw_io_helper(struct virtio_ccw_device *vcdev, 323 struct ccw1 *ccw, __u32 intparm) 324{ 325 int ret; 326 unsigned long flags; 327 int flag = intparm & VIRTIO_CCW_INTPARM_MASK; 328 329 mutex_lock(&vcdev->io_lock); 330 do { 331 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); 332 ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0); 333 if (!ret) { 334 if (!vcdev->curr_io) 335 vcdev->err = 0; 336 vcdev->curr_io |= flag; 337 } 338 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); 339 cpu_relax(); 340 } while (ret == -EBUSY); 341 wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0); 342 ret = ret ? ret : vcdev->err; 343 mutex_unlock(&vcdev->io_lock); 344 return ret; 345} 346 347static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev, 348 struct ccw1 *ccw) 349{ 350 int ret; 351 unsigned long *indicatorp = NULL; 352 struct virtio_thinint_area *thinint_area = NULL; 353 struct airq_info *airq_info = vcdev->airq_info; 354 355 if (vcdev->is_thinint) { 356 thinint_area = ccw_device_dma_zalloc(vcdev->cdev, 357 sizeof(*thinint_area)); 358 if (!thinint_area) 359 return; 360 thinint_area->summary_indicator = 361 (unsigned long) get_summary_indicator(airq_info); 362 thinint_area->isc = VIRTIO_AIRQ_ISC; 363 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; 364 ccw->count = sizeof(*thinint_area); 365 ccw->cda = (__u32)virt_to_phys(thinint_area); 366 } else { 367 /* payload is the address of the indicators */ 368 indicatorp = ccw_device_dma_zalloc(vcdev->cdev, 369 sizeof(indicators(vcdev))); 370 if (!indicatorp) 371 return; 372 *indicatorp = 0; 373 ccw->cmd_code = CCW_CMD_SET_IND; 374 ccw->count = sizeof(indicators(vcdev)); 375 ccw->cda = (__u32)virt_to_phys(indicatorp); 376 } 377 /* Deregister indicators from host. */ 378 *indicators(vcdev) = 0; 379 ccw->flags = 0; 380 ret = ccw_io_helper(vcdev, ccw, 381 vcdev->is_thinint ? 382 VIRTIO_CCW_DOING_SET_IND_ADAPTER : 383 VIRTIO_CCW_DOING_SET_IND); 384 if (ret && (ret != -ENODEV)) 385 dev_info(&vcdev->cdev->dev, 386 "Failed to deregister indicators (%d)\n", ret); 387 else if (vcdev->is_thinint) 388 virtio_ccw_drop_indicators(vcdev); 389 ccw_device_dma_free(vcdev->cdev, indicatorp, sizeof(indicators(vcdev))); 390 ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area)); 391} 392 393static inline bool virtio_ccw_do_kvm_notify(struct virtqueue *vq, u32 data) 394{ 395 struct virtio_ccw_vq_info *info = vq->priv; 396 struct virtio_ccw_device *vcdev; 397 struct subchannel_id schid; 398 399 vcdev = to_vc_device(info->vq->vdev); 400 ccw_device_get_schid(vcdev->cdev, &schid); 401 BUILD_BUG_ON(sizeof(struct subchannel_id) != sizeof(unsigned int)); 402 info->cookie = kvm_hypercall3(KVM_S390_VIRTIO_CCW_NOTIFY, 403 *((unsigned int *)&schid), 404 data, info->cookie); 405 if (info->cookie < 0) 406 return false; 407 return true; 408} 409 410static bool virtio_ccw_kvm_notify(struct virtqueue *vq) 411{ 412 return virtio_ccw_do_kvm_notify(vq, vq->index); 413} 414 415static bool virtio_ccw_kvm_notify_with_data(struct virtqueue *vq) 416{ 417 return virtio_ccw_do_kvm_notify(vq, vring_notification_data(vq)); 418} 419 420static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev, 421 struct ccw1 *ccw, int index) 422{ 423 int ret; 424 425 vcdev->dma_area->config_block.index = index; 426 ccw->cmd_code = CCW_CMD_READ_VQ_CONF; 427 ccw->flags = 0; 428 ccw->count = sizeof(struct vq_config_block); 429 ccw->cda = (__u32)virt_to_phys(&vcdev->dma_area->config_block); 430 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF); 431 if (ret) 432 return ret; 433 return vcdev->dma_area->config_block.num ?: -ENOENT; 434} 435 436static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw) 437{ 438 struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev); 439 struct virtio_ccw_vq_info *info = vq->priv; 440 unsigned long flags; 441 int ret; 442 unsigned int index = vq->index; 443 444 /* Remove from our list. */ 445 spin_lock_irqsave(&vcdev->lock, flags); 446 list_del(&info->node); 447 spin_unlock_irqrestore(&vcdev->lock, flags); 448 449 /* Release from host. */ 450 if (vcdev->revision == 0) { 451 info->info_block->l.queue = 0; 452 info->info_block->l.align = 0; 453 info->info_block->l.index = index; 454 info->info_block->l.num = 0; 455 ccw->count = sizeof(info->info_block->l); 456 } else { 457 info->info_block->s.desc = 0; 458 info->info_block->s.index = index; 459 info->info_block->s.num = 0; 460 info->info_block->s.avail = 0; 461 info->info_block->s.used = 0; 462 ccw->count = sizeof(info->info_block->s); 463 } 464 ccw->cmd_code = CCW_CMD_SET_VQ; 465 ccw->flags = 0; 466 ccw->cda = (__u32)virt_to_phys(info->info_block); 467 ret = ccw_io_helper(vcdev, ccw, 468 VIRTIO_CCW_DOING_SET_VQ | index); 469 /* 470 * -ENODEV isn't considered an error: The device is gone anyway. 471 * This may happen on device detach. 472 */ 473 if (ret && (ret != -ENODEV)) 474 dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d\n", 475 ret, index); 476 477 vring_del_virtqueue(vq); 478 ccw_device_dma_free(vcdev->cdev, info->info_block, 479 sizeof(*info->info_block)); 480 kfree(info); 481} 482 483static void virtio_ccw_del_vqs(struct virtio_device *vdev) 484{ 485 struct virtqueue *vq, *n; 486 struct ccw1 *ccw; 487 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 488 489 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 490 if (!ccw) 491 return; 492 493 virtio_ccw_drop_indicator(vcdev, ccw); 494 495 list_for_each_entry_safe(vq, n, &vdev->vqs, list) 496 virtio_ccw_del_vq(vq, ccw); 497 498 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 499} 500 501static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev, 502 int i, vq_callback_t *callback, 503 const char *name, bool ctx, 504 struct ccw1 *ccw) 505{ 506 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 507 bool (*notify)(struct virtqueue *vq); 508 int err; 509 struct virtqueue *vq = NULL; 510 struct virtio_ccw_vq_info *info; 511 u64 queue; 512 unsigned long flags; 513 bool may_reduce; 514 515 if (__virtio_test_bit(vdev, VIRTIO_F_NOTIFICATION_DATA)) 516 notify = virtio_ccw_kvm_notify_with_data; 517 else 518 notify = virtio_ccw_kvm_notify; 519 520 /* Allocate queue. */ 521 info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL); 522 if (!info) { 523 dev_warn(&vcdev->cdev->dev, "no info\n"); 524 err = -ENOMEM; 525 goto out_err; 526 } 527 info->info_block = ccw_device_dma_zalloc(vcdev->cdev, 528 sizeof(*info->info_block)); 529 if (!info->info_block) { 530 dev_warn(&vcdev->cdev->dev, "no info block\n"); 531 err = -ENOMEM; 532 goto out_err; 533 } 534 info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i); 535 if (info->num < 0) { 536 err = info->num; 537 goto out_err; 538 } 539 may_reduce = vcdev->revision > 0; 540 vq = vring_create_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, 541 vdev, true, may_reduce, ctx, 542 notify, callback, name); 543 544 if (!vq) { 545 /* For now, we fail if we can't get the requested size. */ 546 dev_warn(&vcdev->cdev->dev, "no vq\n"); 547 err = -ENOMEM; 548 goto out_err; 549 } 550 551 vq->num_max = info->num; 552 553 /* it may have been reduced */ 554 info->num = virtqueue_get_vring_size(vq); 555 556 /* Register it with the host. */ 557 queue = virtqueue_get_desc_addr(vq); 558 if (vcdev->revision == 0) { 559 info->info_block->l.queue = queue; 560 info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN; 561 info->info_block->l.index = i; 562 info->info_block->l.num = info->num; 563 ccw->count = sizeof(info->info_block->l); 564 } else { 565 info->info_block->s.desc = queue; 566 info->info_block->s.index = i; 567 info->info_block->s.num = info->num; 568 info->info_block->s.avail = (__u64)virtqueue_get_avail_addr(vq); 569 info->info_block->s.used = (__u64)virtqueue_get_used_addr(vq); 570 ccw->count = sizeof(info->info_block->s); 571 } 572 ccw->cmd_code = CCW_CMD_SET_VQ; 573 ccw->flags = 0; 574 ccw->cda = (__u32)virt_to_phys(info->info_block); 575 err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i); 576 if (err) { 577 dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n"); 578 goto out_err; 579 } 580 581 info->vq = vq; 582 vq->priv = info; 583 584 /* Save it to our list. */ 585 spin_lock_irqsave(&vcdev->lock, flags); 586 list_add(&info->node, &vcdev->virtqueues); 587 spin_unlock_irqrestore(&vcdev->lock, flags); 588 589 return vq; 590 591out_err: 592 if (vq) 593 vring_del_virtqueue(vq); 594 if (info) { 595 ccw_device_dma_free(vcdev->cdev, info->info_block, 596 sizeof(*info->info_block)); 597 } 598 kfree(info); 599 return ERR_PTR(err); 600} 601 602static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev, 603 struct virtqueue *vqs[], int nvqs, 604 struct ccw1 *ccw) 605{ 606 int ret; 607 struct virtio_thinint_area *thinint_area = NULL; 608 unsigned long indicator_addr; 609 struct airq_info *info; 610 611 thinint_area = ccw_device_dma_zalloc(vcdev->cdev, 612 sizeof(*thinint_area)); 613 if (!thinint_area) { 614 ret = -ENOMEM; 615 goto out; 616 } 617 /* Try to get an indicator. */ 618 indicator_addr = get_airq_indicator(vqs, nvqs, 619 &thinint_area->bit_nr, 620 &vcdev->airq_info); 621 if (!indicator_addr) { 622 ret = -ENOSPC; 623 goto out; 624 } 625 thinint_area->indicator = virt_to_phys((void *)indicator_addr); 626 info = vcdev->airq_info; 627 thinint_area->summary_indicator = 628 virt_to_phys(get_summary_indicator(info)); 629 thinint_area->isc = VIRTIO_AIRQ_ISC; 630 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; 631 ccw->flags = CCW_FLAG_SLI; 632 ccw->count = sizeof(*thinint_area); 633 ccw->cda = (__u32)virt_to_phys(thinint_area); 634 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER); 635 if (ret) { 636 if (ret == -EOPNOTSUPP) { 637 /* 638 * The host does not support adapter interrupts 639 * for virtio-ccw, stop trying. 640 */ 641 virtio_ccw_use_airq = 0; 642 pr_info("Adapter interrupts unsupported on host\n"); 643 } else 644 dev_warn(&vcdev->cdev->dev, 645 "enabling adapter interrupts = %d\n", ret); 646 virtio_ccw_drop_indicators(vcdev); 647 } 648out: 649 ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area)); 650 return ret; 651} 652 653static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, 654 struct virtqueue *vqs[], 655 vq_callback_t *callbacks[], 656 const char * const names[], 657 const bool *ctx, 658 struct irq_affinity *desc) 659{ 660 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 661 unsigned long *indicatorp = NULL; 662 int ret, i, queue_idx = 0; 663 struct ccw1 *ccw; 664 665 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 666 if (!ccw) 667 return -ENOMEM; 668 669 for (i = 0; i < nvqs; ++i) { 670 if (!names[i]) { 671 vqs[i] = NULL; 672 continue; 673 } 674 675 vqs[i] = virtio_ccw_setup_vq(vdev, queue_idx++, callbacks[i], 676 names[i], ctx ? ctx[i] : false, 677 ccw); 678 if (IS_ERR(vqs[i])) { 679 ret = PTR_ERR(vqs[i]); 680 vqs[i] = NULL; 681 goto out; 682 } 683 } 684 ret = -ENOMEM; 685 /* 686 * We need a data area under 2G to communicate. Our payload is 687 * the address of the indicators. 688 */ 689 indicatorp = ccw_device_dma_zalloc(vcdev->cdev, 690 sizeof(indicators(vcdev))); 691 if (!indicatorp) 692 goto out; 693 *indicatorp = (unsigned long) indicators(vcdev); 694 if (vcdev->is_thinint) { 695 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw); 696 if (ret) 697 /* no error, just fall back to legacy interrupts */ 698 vcdev->is_thinint = false; 699 } 700 if (!vcdev->is_thinint) { 701 /* Register queue indicators with host. */ 702 *indicators(vcdev) = 0; 703 ccw->cmd_code = CCW_CMD_SET_IND; 704 ccw->flags = 0; 705 ccw->count = sizeof(indicators(vcdev)); 706 ccw->cda = (__u32)virt_to_phys(indicatorp); 707 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND); 708 if (ret) 709 goto out; 710 } 711 /* Register indicators2 with host for config changes */ 712 *indicatorp = (unsigned long) indicators2(vcdev); 713 *indicators2(vcdev) = 0; 714 ccw->cmd_code = CCW_CMD_SET_CONF_IND; 715 ccw->flags = 0; 716 ccw->count = sizeof(indicators2(vcdev)); 717 ccw->cda = (__u32)virt_to_phys(indicatorp); 718 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND); 719 if (ret) 720 goto out; 721 722 if (indicatorp) 723 ccw_device_dma_free(vcdev->cdev, indicatorp, 724 sizeof(indicators(vcdev))); 725 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 726 return 0; 727out: 728 if (indicatorp) 729 ccw_device_dma_free(vcdev->cdev, indicatorp, 730 sizeof(indicators(vcdev))); 731 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 732 virtio_ccw_del_vqs(vdev); 733 return ret; 734} 735 736static void virtio_ccw_reset(struct virtio_device *vdev) 737{ 738 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 739 struct ccw1 *ccw; 740 741 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 742 if (!ccw) 743 return; 744 745 /* Zero status bits. */ 746 vcdev->dma_area->status = 0; 747 748 /* Send a reset ccw on device. */ 749 ccw->cmd_code = CCW_CMD_VDEV_RESET; 750 ccw->flags = 0; 751 ccw->count = 0; 752 ccw->cda = 0; 753 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET); 754 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 755} 756 757static u64 virtio_ccw_get_features(struct virtio_device *vdev) 758{ 759 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 760 struct virtio_feature_desc *features; 761 int ret; 762 u64 rc; 763 struct ccw1 *ccw; 764 765 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 766 if (!ccw) 767 return 0; 768 769 features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features)); 770 if (!features) { 771 rc = 0; 772 goto out_free; 773 } 774 /* Read the feature bits from the host. */ 775 features->index = 0; 776 ccw->cmd_code = CCW_CMD_READ_FEAT; 777 ccw->flags = 0; 778 ccw->count = sizeof(*features); 779 ccw->cda = (__u32)virt_to_phys(features); 780 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 781 if (ret) { 782 rc = 0; 783 goto out_free; 784 } 785 786 rc = le32_to_cpu(features->features); 787 788 if (vcdev->revision == 0) 789 goto out_free; 790 791 /* Read second half of the feature bits from the host. */ 792 features->index = 1; 793 ccw->cmd_code = CCW_CMD_READ_FEAT; 794 ccw->flags = 0; 795 ccw->count = sizeof(*features); 796 ccw->cda = (__u32)virt_to_phys(features); 797 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 798 if (ret == 0) 799 rc |= (u64)le32_to_cpu(features->features) << 32; 800 801out_free: 802 ccw_device_dma_free(vcdev->cdev, features, sizeof(*features)); 803 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 804 return rc; 805} 806 807static void ccw_transport_features(struct virtio_device *vdev) 808{ 809 /* 810 * Currently nothing to do here. 811 */ 812} 813 814static int virtio_ccw_finalize_features(struct virtio_device *vdev) 815{ 816 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 817 struct virtio_feature_desc *features; 818 struct ccw1 *ccw; 819 int ret; 820 821 if (vcdev->revision >= 1 && 822 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { 823 dev_err(&vdev->dev, "virtio: device uses revision 1 " 824 "but does not have VIRTIO_F_VERSION_1\n"); 825 return -EINVAL; 826 } 827 828 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 829 if (!ccw) 830 return -ENOMEM; 831 832 features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features)); 833 if (!features) { 834 ret = -ENOMEM; 835 goto out_free; 836 } 837 /* Give virtio_ring a chance to accept features. */ 838 vring_transport_features(vdev); 839 840 /* Give virtio_ccw a chance to accept features. */ 841 ccw_transport_features(vdev); 842 843 features->index = 0; 844 features->features = cpu_to_le32((u32)vdev->features); 845 /* Write the first half of the feature bits to the host. */ 846 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 847 ccw->flags = 0; 848 ccw->count = sizeof(*features); 849 ccw->cda = (__u32)virt_to_phys(features); 850 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 851 if (ret) 852 goto out_free; 853 854 if (vcdev->revision == 0) 855 goto out_free; 856 857 features->index = 1; 858 features->features = cpu_to_le32(vdev->features >> 32); 859 /* Write the second half of the feature bits to the host. */ 860 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 861 ccw->flags = 0; 862 ccw->count = sizeof(*features); 863 ccw->cda = (__u32)virt_to_phys(features); 864 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 865 866out_free: 867 ccw_device_dma_free(vcdev->cdev, features, sizeof(*features)); 868 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 869 870 return ret; 871} 872 873static void virtio_ccw_get_config(struct virtio_device *vdev, 874 unsigned int offset, void *buf, unsigned len) 875{ 876 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 877 int ret; 878 struct ccw1 *ccw; 879 void *config_area; 880 unsigned long flags; 881 882 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 883 if (!ccw) 884 return; 885 886 config_area = ccw_device_dma_zalloc(vcdev->cdev, 887 VIRTIO_CCW_CONFIG_SIZE); 888 if (!config_area) 889 goto out_free; 890 891 /* Read the config area from the host. */ 892 ccw->cmd_code = CCW_CMD_READ_CONF; 893 ccw->flags = 0; 894 ccw->count = offset + len; 895 ccw->cda = (__u32)virt_to_phys(config_area); 896 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG); 897 if (ret) 898 goto out_free; 899 900 spin_lock_irqsave(&vcdev->lock, flags); 901 memcpy(vcdev->config, config_area, offset + len); 902 if (vcdev->config_ready < offset + len) 903 vcdev->config_ready = offset + len; 904 spin_unlock_irqrestore(&vcdev->lock, flags); 905 if (buf) 906 memcpy(buf, config_area + offset, len); 907 908out_free: 909 ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE); 910 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 911} 912 913static void virtio_ccw_set_config(struct virtio_device *vdev, 914 unsigned int offset, const void *buf, 915 unsigned len) 916{ 917 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 918 struct ccw1 *ccw; 919 void *config_area; 920 unsigned long flags; 921 922 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 923 if (!ccw) 924 return; 925 926 config_area = ccw_device_dma_zalloc(vcdev->cdev, 927 VIRTIO_CCW_CONFIG_SIZE); 928 if (!config_area) 929 goto out_free; 930 931 /* Make sure we don't overwrite fields. */ 932 if (vcdev->config_ready < offset) 933 virtio_ccw_get_config(vdev, 0, NULL, offset); 934 spin_lock_irqsave(&vcdev->lock, flags); 935 memcpy(&vcdev->config[offset], buf, len); 936 /* Write the config area to the host. */ 937 memcpy(config_area, vcdev->config, sizeof(vcdev->config)); 938 spin_unlock_irqrestore(&vcdev->lock, flags); 939 ccw->cmd_code = CCW_CMD_WRITE_CONF; 940 ccw->flags = 0; 941 ccw->count = offset + len; 942 ccw->cda = (__u32)virt_to_phys(config_area); 943 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG); 944 945out_free: 946 ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE); 947 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 948} 949 950static u8 virtio_ccw_get_status(struct virtio_device *vdev) 951{ 952 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 953 u8 old_status = vcdev->dma_area->status; 954 struct ccw1 *ccw; 955 956 if (vcdev->revision < 2) 957 return vcdev->dma_area->status; 958 959 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 960 if (!ccw) 961 return old_status; 962 963 ccw->cmd_code = CCW_CMD_READ_STATUS; 964 ccw->flags = 0; 965 ccw->count = sizeof(vcdev->dma_area->status); 966 ccw->cda = (__u32)virt_to_phys(&vcdev->dma_area->status); 967 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS); 968/* 969 * If the channel program failed (should only happen if the device 970 * was hotunplugged, and then we clean up via the machine check 971 * handler anyway), vcdev->dma_area->status was not overwritten and we just 972 * return the old status, which is fine. 973*/ 974 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 975 976 return vcdev->dma_area->status; 977} 978 979static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status) 980{ 981 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 982 u8 old_status = vcdev->dma_area->status; 983 struct ccw1 *ccw; 984 int ret; 985 986 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 987 if (!ccw) 988 return; 989 990 /* Write the status to the host. */ 991 vcdev->dma_area->status = status; 992 ccw->cmd_code = CCW_CMD_WRITE_STATUS; 993 ccw->flags = 0; 994 ccw->count = sizeof(status); 995 ccw->cda = (__u32)virt_to_phys(&vcdev->dma_area->status); 996 /* We use ssch for setting the status which is a serializing 997 * instruction that guarantees the memory writes have 998 * completed before ssch. 999 */ 1000 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS); 1001 /* Write failed? We assume status is unchanged. */ 1002 if (ret) 1003 vcdev->dma_area->status = old_status; 1004 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 1005} 1006 1007static const char *virtio_ccw_bus_name(struct virtio_device *vdev) 1008{ 1009 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 1010 1011 return dev_name(&vcdev->cdev->dev); 1012} 1013 1014static void virtio_ccw_synchronize_cbs(struct virtio_device *vdev) 1015{ 1016 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 1017 struct airq_info *info = vcdev->airq_info; 1018 1019 if (info) { 1020 /* 1021 * This device uses adapter interrupts: synchronize with 1022 * vring_interrupt() called by virtio_airq_handler() 1023 * via the indicator area lock. 1024 */ 1025 write_lock_irq(&info->lock); 1026 write_unlock_irq(&info->lock); 1027 } else { 1028 /* This device uses classic interrupts: synchronize 1029 * with vring_interrupt() called by 1030 * virtio_ccw_int_handler() via the per-device 1031 * irq_lock 1032 */ 1033 write_lock_irq(&vcdev->irq_lock); 1034 write_unlock_irq(&vcdev->irq_lock); 1035 } 1036} 1037 1038static const struct virtio_config_ops virtio_ccw_config_ops = { 1039 .get_features = virtio_ccw_get_features, 1040 .finalize_features = virtio_ccw_finalize_features, 1041 .get = virtio_ccw_get_config, 1042 .set = virtio_ccw_set_config, 1043 .get_status = virtio_ccw_get_status, 1044 .set_status = virtio_ccw_set_status, 1045 .reset = virtio_ccw_reset, 1046 .find_vqs = virtio_ccw_find_vqs, 1047 .del_vqs = virtio_ccw_del_vqs, 1048 .bus_name = virtio_ccw_bus_name, 1049 .synchronize_cbs = virtio_ccw_synchronize_cbs, 1050}; 1051 1052 1053/* 1054 * ccw bus driver related functions 1055 */ 1056 1057static void virtio_ccw_release_dev(struct device *_d) 1058{ 1059 struct virtio_device *dev = dev_to_virtio(_d); 1060 struct virtio_ccw_device *vcdev = to_vc_device(dev); 1061 1062 ccw_device_dma_free(vcdev->cdev, vcdev->dma_area, 1063 sizeof(*vcdev->dma_area)); 1064 kfree(vcdev); 1065} 1066 1067static int irb_is_error(struct irb *irb) 1068{ 1069 if (scsw_cstat(&irb->scsw) != 0) 1070 return 1; 1071 if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) 1072 return 1; 1073 if (scsw_cc(&irb->scsw) != 0) 1074 return 1; 1075 return 0; 1076} 1077 1078static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev, 1079 int index) 1080{ 1081 struct virtio_ccw_vq_info *info; 1082 unsigned long flags; 1083 struct virtqueue *vq; 1084 1085 vq = NULL; 1086 spin_lock_irqsave(&vcdev->lock, flags); 1087 list_for_each_entry(info, &vcdev->virtqueues, node) { 1088 if (info->vq->index == index) { 1089 vq = info->vq; 1090 break; 1091 } 1092 } 1093 spin_unlock_irqrestore(&vcdev->lock, flags); 1094 return vq; 1095} 1096 1097static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev, 1098 __u32 activity) 1099{ 1100 if (vcdev->curr_io & activity) { 1101 switch (activity) { 1102 case VIRTIO_CCW_DOING_READ_FEAT: 1103 case VIRTIO_CCW_DOING_WRITE_FEAT: 1104 case VIRTIO_CCW_DOING_READ_CONFIG: 1105 case VIRTIO_CCW_DOING_WRITE_CONFIG: 1106 case VIRTIO_CCW_DOING_WRITE_STATUS: 1107 case VIRTIO_CCW_DOING_READ_STATUS: 1108 case VIRTIO_CCW_DOING_SET_VQ: 1109 case VIRTIO_CCW_DOING_SET_IND: 1110 case VIRTIO_CCW_DOING_SET_CONF_IND: 1111 case VIRTIO_CCW_DOING_RESET: 1112 case VIRTIO_CCW_DOING_READ_VQ_CONF: 1113 case VIRTIO_CCW_DOING_SET_IND_ADAPTER: 1114 case VIRTIO_CCW_DOING_SET_VIRTIO_REV: 1115 vcdev->curr_io &= ~activity; 1116 wake_up(&vcdev->wait_q); 1117 break; 1118 default: 1119 /* don't know what to do... */ 1120 dev_warn(&vcdev->cdev->dev, 1121 "Suspicious activity '%08x'\n", activity); 1122 WARN_ON(1); 1123 break; 1124 } 1125 } 1126} 1127 1128static void virtio_ccw_int_handler(struct ccw_device *cdev, 1129 unsigned long intparm, 1130 struct irb *irb) 1131{ 1132 __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK; 1133 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1134 int i; 1135 struct virtqueue *vq; 1136 1137 if (!vcdev) 1138 return; 1139 if (IS_ERR(irb)) { 1140 vcdev->err = PTR_ERR(irb); 1141 virtio_ccw_check_activity(vcdev, activity); 1142 /* Don't poke around indicators, something's wrong. */ 1143 return; 1144 } 1145 /* Check if it's a notification from the host. */ 1146 if ((intparm == 0) && 1147 (scsw_stctl(&irb->scsw) == 1148 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) { 1149 /* OK */ 1150 } 1151 if (irb_is_error(irb)) { 1152 /* Command reject? */ 1153 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) && 1154 (irb->ecw[0] & SNS0_CMD_REJECT)) 1155 vcdev->err = -EOPNOTSUPP; 1156 else 1157 /* Map everything else to -EIO. */ 1158 vcdev->err = -EIO; 1159 } 1160 virtio_ccw_check_activity(vcdev, activity); 1161#ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION 1162 /* 1163 * Paired with virtio_ccw_synchronize_cbs() and interrupts are 1164 * disabled here. 1165 */ 1166 read_lock(&vcdev->irq_lock); 1167#endif 1168 for_each_set_bit(i, indicators(vcdev), 1169 sizeof(*indicators(vcdev)) * BITS_PER_BYTE) { 1170 /* The bit clear must happen before the vring kick. */ 1171 clear_bit(i, indicators(vcdev)); 1172 barrier(); 1173 vq = virtio_ccw_vq_by_ind(vcdev, i); 1174 vring_interrupt(0, vq); 1175 } 1176#ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION 1177 read_unlock(&vcdev->irq_lock); 1178#endif 1179 if (test_bit(0, indicators2(vcdev))) { 1180 virtio_config_changed(&vcdev->vdev); 1181 clear_bit(0, indicators2(vcdev)); 1182 } 1183} 1184 1185/* 1186 * We usually want to autoonline all devices, but give the admin 1187 * a way to exempt devices from this. 1188 */ 1189#define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ 1190 (8*sizeof(long))) 1191static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS]; 1192 1193static char *no_auto = ""; 1194 1195module_param(no_auto, charp, 0444); 1196MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined"); 1197 1198static int virtio_ccw_check_autoonline(struct ccw_device *cdev) 1199{ 1200 struct ccw_dev_id id; 1201 1202 ccw_device_get_id(cdev, &id); 1203 if (test_bit(id.devno, devs_no_auto[id.ssid])) 1204 return 0; 1205 return 1; 1206} 1207 1208static void virtio_ccw_auto_online(void *data, async_cookie_t cookie) 1209{ 1210 struct ccw_device *cdev = data; 1211 int ret; 1212 1213 ret = ccw_device_set_online(cdev); 1214 if (ret) 1215 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret); 1216} 1217 1218static int virtio_ccw_probe(struct ccw_device *cdev) 1219{ 1220 cdev->handler = virtio_ccw_int_handler; 1221 1222 if (virtio_ccw_check_autoonline(cdev)) 1223 async_schedule(virtio_ccw_auto_online, cdev); 1224 return 0; 1225} 1226 1227static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev) 1228{ 1229 unsigned long flags; 1230 struct virtio_ccw_device *vcdev; 1231 1232 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1233 vcdev = dev_get_drvdata(&cdev->dev); 1234 if (!vcdev || vcdev->going_away) { 1235 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1236 return NULL; 1237 } 1238 vcdev->going_away = true; 1239 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1240 return vcdev; 1241} 1242 1243static void virtio_ccw_remove(struct ccw_device *cdev) 1244{ 1245 unsigned long flags; 1246 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1247 1248 if (vcdev && cdev->online) { 1249 if (vcdev->device_lost) 1250 virtio_break_device(&vcdev->vdev); 1251 unregister_virtio_device(&vcdev->vdev); 1252 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1253 dev_set_drvdata(&cdev->dev, NULL); 1254 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1255 } 1256 cdev->handler = NULL; 1257} 1258 1259static int virtio_ccw_offline(struct ccw_device *cdev) 1260{ 1261 unsigned long flags; 1262 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1263 1264 if (!vcdev) 1265 return 0; 1266 if (vcdev->device_lost) 1267 virtio_break_device(&vcdev->vdev); 1268 unregister_virtio_device(&vcdev->vdev); 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 return 0; 1273} 1274 1275static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev) 1276{ 1277 struct virtio_rev_info *rev; 1278 struct ccw1 *ccw; 1279 int ret; 1280 1281 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 1282 if (!ccw) 1283 return -ENOMEM; 1284 rev = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*rev)); 1285 if (!rev) { 1286 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 1287 return -ENOMEM; 1288 } 1289 1290 /* Set transport revision */ 1291 ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV; 1292 ccw->flags = 0; 1293 ccw->count = sizeof(*rev); 1294 ccw->cda = (__u32)virt_to_phys(rev); 1295 1296 vcdev->revision = VIRTIO_CCW_REV_MAX; 1297 do { 1298 rev->revision = vcdev->revision; 1299 /* none of our supported revisions carry payload */ 1300 rev->length = 0; 1301 ret = ccw_io_helper(vcdev, ccw, 1302 VIRTIO_CCW_DOING_SET_VIRTIO_REV); 1303 if (ret == -EOPNOTSUPP) { 1304 if (vcdev->revision == 0) 1305 /* 1306 * The host device does not support setting 1307 * the revision: let's operate it in legacy 1308 * mode. 1309 */ 1310 ret = 0; 1311 else 1312 vcdev->revision--; 1313 } 1314 } while (ret == -EOPNOTSUPP); 1315 1316 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 1317 ccw_device_dma_free(vcdev->cdev, rev, sizeof(*rev)); 1318 return ret; 1319} 1320 1321static int virtio_ccw_online(struct ccw_device *cdev) 1322{ 1323 int ret; 1324 struct virtio_ccw_device *vcdev; 1325 unsigned long flags; 1326 1327 vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL); 1328 if (!vcdev) { 1329 dev_warn(&cdev->dev, "Could not get memory for virtio\n"); 1330 ret = -ENOMEM; 1331 goto out_free; 1332 } 1333 vcdev->vdev.dev.parent = &cdev->dev; 1334 vcdev->cdev = cdev; 1335 vcdev->dma_area = ccw_device_dma_zalloc(vcdev->cdev, 1336 sizeof(*vcdev->dma_area)); 1337 if (!vcdev->dma_area) { 1338 ret = -ENOMEM; 1339 goto out_free; 1340 } 1341 1342 vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */ 1343 1344 vcdev->vdev.dev.release = virtio_ccw_release_dev; 1345 vcdev->vdev.config = &virtio_ccw_config_ops; 1346 init_waitqueue_head(&vcdev->wait_q); 1347 INIT_LIST_HEAD(&vcdev->virtqueues); 1348 spin_lock_init(&vcdev->lock); 1349 rwlock_init(&vcdev->irq_lock); 1350 mutex_init(&vcdev->io_lock); 1351 1352 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1353 dev_set_drvdata(&cdev->dev, vcdev); 1354 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1355 vcdev->vdev.id.vendor = cdev->id.cu_type; 1356 vcdev->vdev.id.device = cdev->id.cu_model; 1357 1358 ret = virtio_ccw_set_transport_rev(vcdev); 1359 if (ret) 1360 goto out_free; 1361 1362 ret = register_virtio_device(&vcdev->vdev); 1363 if (ret) { 1364 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n", 1365 ret); 1366 goto out_put; 1367 } 1368 return 0; 1369out_put: 1370 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1371 dev_set_drvdata(&cdev->dev, NULL); 1372 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1373 put_device(&vcdev->vdev.dev); 1374 return ret; 1375out_free: 1376 if (vcdev) { 1377 ccw_device_dma_free(vcdev->cdev, vcdev->dma_area, 1378 sizeof(*vcdev->dma_area)); 1379 } 1380 kfree(vcdev); 1381 return ret; 1382} 1383 1384static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event) 1385{ 1386 int rc; 1387 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1388 1389 /* 1390 * Make sure vcdev is set 1391 * i.e. set_offline/remove callback not already running 1392 */ 1393 if (!vcdev) 1394 return NOTIFY_DONE; 1395 1396 switch (event) { 1397 case CIO_GONE: 1398 vcdev->device_lost = true; 1399 rc = NOTIFY_DONE; 1400 break; 1401 case CIO_OPER: 1402 rc = NOTIFY_OK; 1403 break; 1404 default: 1405 rc = NOTIFY_DONE; 1406 break; 1407 } 1408 return rc; 1409} 1410 1411static struct ccw_device_id virtio_ids[] = { 1412 { CCW_DEVICE(0x3832, 0) }, 1413 {}, 1414}; 1415 1416static struct ccw_driver virtio_ccw_driver = { 1417 .driver = { 1418 .owner = THIS_MODULE, 1419 .name = "virtio_ccw", 1420 }, 1421 .ids = virtio_ids, 1422 .probe = virtio_ccw_probe, 1423 .remove = virtio_ccw_remove, 1424 .set_offline = virtio_ccw_offline, 1425 .set_online = virtio_ccw_online, 1426 .notify = virtio_ccw_cio_notify, 1427 .int_class = IRQIO_VIR, 1428}; 1429 1430static int __init pure_hex(char **cp, unsigned int *val, int min_digit, 1431 int max_digit, int max_val) 1432{ 1433 int diff; 1434 1435 diff = 0; 1436 *val = 0; 1437 1438 while (diff <= max_digit) { 1439 int value = hex_to_bin(**cp); 1440 1441 if (value < 0) 1442 break; 1443 *val = *val * 16 + value; 1444 (*cp)++; 1445 diff++; 1446 } 1447 1448 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) 1449 return 1; 1450 1451 return 0; 1452} 1453 1454static int __init parse_busid(char *str, unsigned int *cssid, 1455 unsigned int *ssid, unsigned int *devno) 1456{ 1457 char *str_work; 1458 int rc, ret; 1459 1460 rc = 1; 1461 1462 if (*str == '\0') 1463 goto out; 1464 1465 str_work = str; 1466 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); 1467 if (ret || (str_work[0] != '.')) 1468 goto out; 1469 str_work++; 1470 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); 1471 if (ret || (str_work[0] != '.')) 1472 goto out; 1473 str_work++; 1474 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); 1475 if (ret || (str_work[0] != '\0')) 1476 goto out; 1477 1478 rc = 0; 1479out: 1480 return rc; 1481} 1482 1483static void __init no_auto_parse(void) 1484{ 1485 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; 1486 char *parm, *str; 1487 int rc; 1488 1489 str = no_auto; 1490 while ((parm = strsep(&str, ","))) { 1491 rc = parse_busid(strsep(&parm, "-"), &from_cssid, 1492 &from_ssid, &from); 1493 if (rc) 1494 continue; 1495 if (parm != NULL) { 1496 rc = parse_busid(parm, &to_cssid, 1497 &to_ssid, &to); 1498 if ((from_ssid > to_ssid) || 1499 ((from_ssid == to_ssid) && (from > to))) 1500 rc = -EINVAL; 1501 } else { 1502 to_cssid = from_cssid; 1503 to_ssid = from_ssid; 1504 to = from; 1505 } 1506 if (rc) 1507 continue; 1508 while ((from_ssid < to_ssid) || 1509 ((from_ssid == to_ssid) && (from <= to))) { 1510 set_bit(from, devs_no_auto[from_ssid]); 1511 from++; 1512 if (from > __MAX_SUBCHANNEL) { 1513 from_ssid++; 1514 from = 0; 1515 } 1516 } 1517 } 1518} 1519 1520static int __init virtio_ccw_init(void) 1521{ 1522 int rc; 1523 1524 /* parse no_auto string before we do anything further */ 1525 no_auto_parse(); 1526 1527 summary_indicators = cio_dma_zalloc(MAX_AIRQ_AREAS); 1528 if (!summary_indicators) 1529 return -ENOMEM; 1530 rc = ccw_driver_register(&virtio_ccw_driver); 1531 if (rc) 1532 cio_dma_free(summary_indicators, MAX_AIRQ_AREAS); 1533 return rc; 1534} 1535device_initcall(virtio_ccw_init); 1536