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 42 struct 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 50 struct vcdev_dma_area { 51 unsigned long indicators; 52 unsigned long indicators2; 53 struct vq_config_block config_block; 54 __u8 status; 55 }; 56 57 struct 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 77 static inline unsigned long *indicators(struct virtio_ccw_device *vcdev) 78 { 79 return &vcdev->dma_area->indicators; 80 } 81 82 static inline unsigned long *indicators2(struct virtio_ccw_device *vcdev) 83 { 84 return &vcdev->dma_area->indicators2; 85 } 86 87 struct vq_info_block_legacy { 88 __u64 queue; 89 __u32 align; 90 __u16 index; 91 __u16 num; 92 } __packed; 93 94 struct vq_info_block { 95 __u64 desc; 96 __u32 res0; 97 __u16 index; 98 __u16 num; 99 __u64 avail; 100 __u64 used; 101 } __packed; 102 103 struct virtio_feature_desc { 104 __le32 features; 105 __u8 index; 106 } __packed; 107 108 struct virtio_thinint_area { 109 unsigned long summary_indicator; 110 unsigned long indicator; 111 u64 bit_nr; 112 u8 isc; 113 } __packed; 114 115 struct 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 2 123 124 struct 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 20 140 141 static int virtio_ccw_use_airq = 1; 142 143 struct airq_info { 144 rwlock_t lock; 145 u8 summary_indicator_idx; 146 struct airq_struct airq; 147 struct airq_iv *aiv; 148 }; 149 static struct airq_info *airq_areas[MAX_AIRQ_AREAS]; 150 static DEFINE_MUTEX(airq_areas_lock); 151 152 static u8 *summary_indicators; 153 154 static 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 187 188 static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev) 189 { 190 return container_of(vdev, struct virtio_ccw_device, vdev); 191 } 192 193 static 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 } 207 208 static 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 } 234 235 static 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.lsi_mask = 0xff; 254 info->airq.isc = VIRTIO_AIRQ_ISC; 255 rc = register_adapter_interrupt(&info->airq); 256 if (rc) { 257 airq_iv_release(info->aiv); 258 kfree(info); 259 return NULL; 260 } 261 return info; 262 } 263 264 static unsigned long get_airq_indicator(struct virtqueue *vqs[], int nvqs, 265 u64 *first, void **airq_info) 266 { 267 int i, j; 268 struct airq_info *info; 269 unsigned long indicator_addr = 0; 270 unsigned long bit, flags; 271 272 for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) { 273 mutex_lock(&airq_areas_lock); 274 if (!airq_areas[i]) 275 airq_areas[i] = new_airq_info(i); 276 info = airq_areas[i]; 277 mutex_unlock(&airq_areas_lock); 278 if (!info) 279 return 0; 280 write_lock_irqsave(&info->lock, flags); 281 bit = airq_iv_alloc(info->aiv, nvqs); 282 if (bit == -1UL) { 283 /* Not enough vacancies. */ 284 write_unlock_irqrestore(&info->lock, flags); 285 continue; 286 } 287 *first = bit; 288 *airq_info = info; 289 indicator_addr = (unsigned long)info->aiv->vector; 290 for (j = 0; j < nvqs; j++) { 291 airq_iv_set_ptr(info->aiv, bit + j, 292 (unsigned long)vqs[j]); 293 } 294 write_unlock_irqrestore(&info->lock, flags); 295 } 296 return indicator_addr; 297 } 298 299 static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev) 300 { 301 struct virtio_ccw_vq_info *info; 302 303 if (!vcdev->airq_info) 304 return; 305 list_for_each_entry(info, &vcdev->virtqueues, node) 306 drop_airq_indicator(info->vq, vcdev->airq_info); 307 } 308 309 static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag) 310 { 311 unsigned long flags; 312 __u32 ret; 313 314 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); 315 if (vcdev->err) 316 ret = 0; 317 else 318 ret = vcdev->curr_io & flag; 319 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); 320 return ret; 321 } 322 323 static int ccw_io_helper(struct virtio_ccw_device *vcdev, 324 struct ccw1 *ccw, __u32 intparm) 325 { 326 int ret; 327 unsigned long flags; 328 int flag = intparm & VIRTIO_CCW_INTPARM_MASK; 329 330 mutex_lock(&vcdev->io_lock); 331 do { 332 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); 333 ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0); 334 if (!ret) { 335 if (!vcdev->curr_io) 336 vcdev->err = 0; 337 vcdev->curr_io |= flag; 338 } 339 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); 340 cpu_relax(); 341 } while (ret == -EBUSY); 342 wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0); 343 ret = ret ? ret : vcdev->err; 344 mutex_unlock(&vcdev->io_lock); 345 return ret; 346 } 347 348 static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev, 349 struct ccw1 *ccw) 350 { 351 int ret; 352 unsigned long *indicatorp = NULL; 353 struct virtio_thinint_area *thinint_area = NULL; 354 struct airq_info *airq_info = vcdev->airq_info; 355 356 if (vcdev->is_thinint) { 357 thinint_area = ccw_device_dma_zalloc(vcdev->cdev, 358 sizeof(*thinint_area)); 359 if (!thinint_area) 360 return; 361 thinint_area->summary_indicator = 362 (unsigned long) get_summary_indicator(airq_info); 363 thinint_area->isc = VIRTIO_AIRQ_ISC; 364 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; 365 ccw->count = sizeof(*thinint_area); 366 ccw->cda = (__u32)(unsigned long) thinint_area; 367 } else { 368 /* payload is the address of the indicators */ 369 indicatorp = ccw_device_dma_zalloc(vcdev->cdev, 370 sizeof(indicators(vcdev))); 371 if (!indicatorp) 372 return; 373 *indicatorp = 0; 374 ccw->cmd_code = CCW_CMD_SET_IND; 375 ccw->count = sizeof(indicators(vcdev)); 376 ccw->cda = (__u32)(unsigned long) indicatorp; 377 } 378 /* Deregister indicators from host. */ 379 *indicators(vcdev) = 0; 380 ccw->flags = 0; 381 ret = ccw_io_helper(vcdev, ccw, 382 vcdev->is_thinint ? 383 VIRTIO_CCW_DOING_SET_IND_ADAPTER : 384 VIRTIO_CCW_DOING_SET_IND); 385 if (ret && (ret != -ENODEV)) 386 dev_info(&vcdev->cdev->dev, 387 "Failed to deregister indicators (%d)\n", ret); 388 else if (vcdev->is_thinint) 389 virtio_ccw_drop_indicators(vcdev); 390 ccw_device_dma_free(vcdev->cdev, indicatorp, sizeof(indicators(vcdev))); 391 ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area)); 392 } 393 394 static bool virtio_ccw_kvm_notify(struct virtqueue *vq) 395 { 396 struct virtio_ccw_vq_info *info = vq->priv; 397 struct virtio_ccw_device *vcdev; 398 struct subchannel_id schid; 399 400 vcdev = to_vc_device(info->vq->vdev); 401 ccw_device_get_schid(vcdev->cdev, &schid); 402 BUILD_BUG_ON(sizeof(struct subchannel_id) != sizeof(unsigned int)); 403 info->cookie = kvm_hypercall3(KVM_S390_VIRTIO_CCW_NOTIFY, 404 *((unsigned int *)&schid), 405 vq->index, info->cookie); 406 if (info->cookie < 0) 407 return false; 408 return true; 409 } 410 411 static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev, 412 struct ccw1 *ccw, int index) 413 { 414 int ret; 415 416 vcdev->dma_area->config_block.index = index; 417 ccw->cmd_code = CCW_CMD_READ_VQ_CONF; 418 ccw->flags = 0; 419 ccw->count = sizeof(struct vq_config_block); 420 ccw->cda = (__u32)(unsigned long)(&vcdev->dma_area->config_block); 421 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF); 422 if (ret) 423 return ret; 424 return vcdev->dma_area->config_block.num ?: -ENOENT; 425 } 426 427 static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw) 428 { 429 struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev); 430 struct virtio_ccw_vq_info *info = vq->priv; 431 unsigned long flags; 432 int ret; 433 unsigned int index = vq->index; 434 435 /* Remove from our list. */ 436 spin_lock_irqsave(&vcdev->lock, flags); 437 list_del(&info->node); 438 spin_unlock_irqrestore(&vcdev->lock, flags); 439 440 /* Release from host. */ 441 if (vcdev->revision == 0) { 442 info->info_block->l.queue = 0; 443 info->info_block->l.align = 0; 444 info->info_block->l.index = index; 445 info->info_block->l.num = 0; 446 ccw->count = sizeof(info->info_block->l); 447 } else { 448 info->info_block->s.desc = 0; 449 info->info_block->s.index = index; 450 info->info_block->s.num = 0; 451 info->info_block->s.avail = 0; 452 info->info_block->s.used = 0; 453 ccw->count = sizeof(info->info_block->s); 454 } 455 ccw->cmd_code = CCW_CMD_SET_VQ; 456 ccw->flags = 0; 457 ccw->cda = (__u32)(unsigned long)(info->info_block); 458 ret = ccw_io_helper(vcdev, ccw, 459 VIRTIO_CCW_DOING_SET_VQ | index); 460 /* 461 * -ENODEV isn't considered an error: The device is gone anyway. 462 * This may happen on device detach. 463 */ 464 if (ret && (ret != -ENODEV)) 465 dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d\n", 466 ret, index); 467 468 vring_del_virtqueue(vq); 469 ccw_device_dma_free(vcdev->cdev, info->info_block, 470 sizeof(*info->info_block)); 471 kfree(info); 472 } 473 474 static void virtio_ccw_del_vqs(struct virtio_device *vdev) 475 { 476 struct virtqueue *vq, *n; 477 struct ccw1 *ccw; 478 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 479 480 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 481 if (!ccw) 482 return; 483 484 virtio_ccw_drop_indicator(vcdev, ccw); 485 486 list_for_each_entry_safe(vq, n, &vdev->vqs, list) 487 virtio_ccw_del_vq(vq, ccw); 488 489 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 490 } 491 492 static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev, 493 int i, vq_callback_t *callback, 494 const char *name, bool ctx, 495 struct ccw1 *ccw) 496 { 497 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 498 int err; 499 struct virtqueue *vq = NULL; 500 struct virtio_ccw_vq_info *info; 501 u64 queue; 502 unsigned long flags; 503 bool may_reduce; 504 505 /* Allocate queue. */ 506 info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL); 507 if (!info) { 508 dev_warn(&vcdev->cdev->dev, "no info\n"); 509 err = -ENOMEM; 510 goto out_err; 511 } 512 info->info_block = ccw_device_dma_zalloc(vcdev->cdev, 513 sizeof(*info->info_block)); 514 if (!info->info_block) { 515 dev_warn(&vcdev->cdev->dev, "no info block\n"); 516 err = -ENOMEM; 517 goto out_err; 518 } 519 info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i); 520 if (info->num < 0) { 521 err = info->num; 522 goto out_err; 523 } 524 may_reduce = vcdev->revision > 0; 525 vq = vring_create_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, 526 vdev, true, may_reduce, ctx, 527 virtio_ccw_kvm_notify, callback, name); 528 529 if (!vq) { 530 /* For now, we fail if we can't get the requested size. */ 531 dev_warn(&vcdev->cdev->dev, "no vq\n"); 532 err = -ENOMEM; 533 goto out_err; 534 } 535 536 vq->num_max = info->num; 537 538 /* it may have been reduced */ 539 info->num = virtqueue_get_vring_size(vq); 540 541 /* Register it with the host. */ 542 queue = virtqueue_get_desc_addr(vq); 543 if (vcdev->revision == 0) { 544 info->info_block->l.queue = queue; 545 info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN; 546 info->info_block->l.index = i; 547 info->info_block->l.num = info->num; 548 ccw->count = sizeof(info->info_block->l); 549 } else { 550 info->info_block->s.desc = queue; 551 info->info_block->s.index = i; 552 info->info_block->s.num = info->num; 553 info->info_block->s.avail = (__u64)virtqueue_get_avail_addr(vq); 554 info->info_block->s.used = (__u64)virtqueue_get_used_addr(vq); 555 ccw->count = sizeof(info->info_block->s); 556 } 557 ccw->cmd_code = CCW_CMD_SET_VQ; 558 ccw->flags = 0; 559 ccw->cda = (__u32)(unsigned long)(info->info_block); 560 err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i); 561 if (err) { 562 dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n"); 563 goto out_err; 564 } 565 566 info->vq = vq; 567 vq->priv = info; 568 569 /* Save it to our list. */ 570 spin_lock_irqsave(&vcdev->lock, flags); 571 list_add(&info->node, &vcdev->virtqueues); 572 spin_unlock_irqrestore(&vcdev->lock, flags); 573 574 return vq; 575 576 out_err: 577 if (vq) 578 vring_del_virtqueue(vq); 579 if (info) { 580 ccw_device_dma_free(vcdev->cdev, info->info_block, 581 sizeof(*info->info_block)); 582 } 583 kfree(info); 584 return ERR_PTR(err); 585 } 586 587 static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev, 588 struct virtqueue *vqs[], int nvqs, 589 struct ccw1 *ccw) 590 { 591 int ret; 592 struct virtio_thinint_area *thinint_area = NULL; 593 struct airq_info *info; 594 595 thinint_area = ccw_device_dma_zalloc(vcdev->cdev, 596 sizeof(*thinint_area)); 597 if (!thinint_area) { 598 ret = -ENOMEM; 599 goto out; 600 } 601 /* Try to get an indicator. */ 602 thinint_area->indicator = get_airq_indicator(vqs, nvqs, 603 &thinint_area->bit_nr, 604 &vcdev->airq_info); 605 if (!thinint_area->indicator) { 606 ret = -ENOSPC; 607 goto out; 608 } 609 info = vcdev->airq_info; 610 thinint_area->summary_indicator = 611 (unsigned long) get_summary_indicator(info); 612 thinint_area->isc = VIRTIO_AIRQ_ISC; 613 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; 614 ccw->flags = CCW_FLAG_SLI; 615 ccw->count = sizeof(*thinint_area); 616 ccw->cda = (__u32)(unsigned long)thinint_area; 617 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER); 618 if (ret) { 619 if (ret == -EOPNOTSUPP) { 620 /* 621 * The host does not support adapter interrupts 622 * for virtio-ccw, stop trying. 623 */ 624 virtio_ccw_use_airq = 0; 625 pr_info("Adapter interrupts unsupported on host\n"); 626 } else 627 dev_warn(&vcdev->cdev->dev, 628 "enabling adapter interrupts = %d\n", ret); 629 virtio_ccw_drop_indicators(vcdev); 630 } 631 out: 632 ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area)); 633 return ret; 634 } 635 636 static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, 637 struct virtqueue *vqs[], 638 vq_callback_t *callbacks[], 639 const char * const names[], 640 u32 sizes[], 641 const bool *ctx, 642 struct irq_affinity *desc) 643 { 644 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 645 unsigned long *indicatorp = NULL; 646 int ret, i, queue_idx = 0; 647 struct ccw1 *ccw; 648 649 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 650 if (!ccw) 651 return -ENOMEM; 652 653 for (i = 0; i < nvqs; ++i) { 654 if (!names[i]) { 655 vqs[i] = NULL; 656 continue; 657 } 658 659 vqs[i] = virtio_ccw_setup_vq(vdev, queue_idx++, callbacks[i], 660 names[i], ctx ? ctx[i] : false, 661 ccw); 662 if (IS_ERR(vqs[i])) { 663 ret = PTR_ERR(vqs[i]); 664 vqs[i] = NULL; 665 goto out; 666 } 667 } 668 ret = -ENOMEM; 669 /* 670 * We need a data area under 2G to communicate. Our payload is 671 * the address of the indicators. 672 */ 673 indicatorp = ccw_device_dma_zalloc(vcdev->cdev, 674 sizeof(indicators(vcdev))); 675 if (!indicatorp) 676 goto out; 677 *indicatorp = (unsigned long) indicators(vcdev); 678 if (vcdev->is_thinint) { 679 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw); 680 if (ret) 681 /* no error, just fall back to legacy interrupts */ 682 vcdev->is_thinint = false; 683 } 684 if (!vcdev->is_thinint) { 685 /* Register queue indicators with host. */ 686 *indicators(vcdev) = 0; 687 ccw->cmd_code = CCW_CMD_SET_IND; 688 ccw->flags = 0; 689 ccw->count = sizeof(indicators(vcdev)); 690 ccw->cda = (__u32)(unsigned long) indicatorp; 691 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND); 692 if (ret) 693 goto out; 694 } 695 /* Register indicators2 with host for config changes */ 696 *indicatorp = (unsigned long) indicators2(vcdev); 697 *indicators2(vcdev) = 0; 698 ccw->cmd_code = CCW_CMD_SET_CONF_IND; 699 ccw->flags = 0; 700 ccw->count = sizeof(indicators2(vcdev)); 701 ccw->cda = (__u32)(unsigned long) indicatorp; 702 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND); 703 if (ret) 704 goto out; 705 706 if (indicatorp) 707 ccw_device_dma_free(vcdev->cdev, indicatorp, 708 sizeof(indicators(vcdev))); 709 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 710 return 0; 711 out: 712 if (indicatorp) 713 ccw_device_dma_free(vcdev->cdev, indicatorp, 714 sizeof(indicators(vcdev))); 715 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 716 virtio_ccw_del_vqs(vdev); 717 return ret; 718 } 719 720 static void virtio_ccw_reset(struct virtio_device *vdev) 721 { 722 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 723 struct ccw1 *ccw; 724 725 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 726 if (!ccw) 727 return; 728 729 /* Zero status bits. */ 730 vcdev->dma_area->status = 0; 731 732 /* Send a reset ccw on device. */ 733 ccw->cmd_code = CCW_CMD_VDEV_RESET; 734 ccw->flags = 0; 735 ccw->count = 0; 736 ccw->cda = 0; 737 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET); 738 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 739 } 740 741 static u64 virtio_ccw_get_features(struct virtio_device *vdev) 742 { 743 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 744 struct virtio_feature_desc *features; 745 int ret; 746 u64 rc; 747 struct ccw1 *ccw; 748 749 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 750 if (!ccw) 751 return 0; 752 753 features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features)); 754 if (!features) { 755 rc = 0; 756 goto out_free; 757 } 758 /* Read the feature bits from the host. */ 759 features->index = 0; 760 ccw->cmd_code = CCW_CMD_READ_FEAT; 761 ccw->flags = 0; 762 ccw->count = sizeof(*features); 763 ccw->cda = (__u32)(unsigned long)features; 764 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 765 if (ret) { 766 rc = 0; 767 goto out_free; 768 } 769 770 rc = le32_to_cpu(features->features); 771 772 if (vcdev->revision == 0) 773 goto out_free; 774 775 /* Read second half of the feature bits from the host. */ 776 features->index = 1; 777 ccw->cmd_code = CCW_CMD_READ_FEAT; 778 ccw->flags = 0; 779 ccw->count = sizeof(*features); 780 ccw->cda = (__u32)(unsigned long)features; 781 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 782 if (ret == 0) 783 rc |= (u64)le32_to_cpu(features->features) << 32; 784 785 out_free: 786 ccw_device_dma_free(vcdev->cdev, features, sizeof(*features)); 787 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 788 return rc; 789 } 790 791 static void ccw_transport_features(struct virtio_device *vdev) 792 { 793 /* 794 * Currently nothing to do here. 795 */ 796 } 797 798 static int virtio_ccw_finalize_features(struct virtio_device *vdev) 799 { 800 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 801 struct virtio_feature_desc *features; 802 struct ccw1 *ccw; 803 int ret; 804 805 if (vcdev->revision >= 1 && 806 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { 807 dev_err(&vdev->dev, "virtio: device uses revision 1 " 808 "but does not have VIRTIO_F_VERSION_1\n"); 809 return -EINVAL; 810 } 811 812 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 813 if (!ccw) 814 return -ENOMEM; 815 816 features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features)); 817 if (!features) { 818 ret = -ENOMEM; 819 goto out_free; 820 } 821 /* Give virtio_ring a chance to accept features. */ 822 vring_transport_features(vdev); 823 824 /* Give virtio_ccw a chance to accept features. */ 825 ccw_transport_features(vdev); 826 827 features->index = 0; 828 features->features = cpu_to_le32((u32)vdev->features); 829 /* Write the first half of the feature bits to the host. */ 830 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 831 ccw->flags = 0; 832 ccw->count = sizeof(*features); 833 ccw->cda = (__u32)(unsigned long)features; 834 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 835 if (ret) 836 goto out_free; 837 838 if (vcdev->revision == 0) 839 goto out_free; 840 841 features->index = 1; 842 features->features = cpu_to_le32(vdev->features >> 32); 843 /* Write the second half of the feature bits to the host. */ 844 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 845 ccw->flags = 0; 846 ccw->count = sizeof(*features); 847 ccw->cda = (__u32)(unsigned long)features; 848 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 849 850 out_free: 851 ccw_device_dma_free(vcdev->cdev, features, sizeof(*features)); 852 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 853 854 return ret; 855 } 856 857 static void virtio_ccw_get_config(struct virtio_device *vdev, 858 unsigned int offset, void *buf, unsigned len) 859 { 860 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 861 int ret; 862 struct ccw1 *ccw; 863 void *config_area; 864 unsigned long flags; 865 866 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 867 if (!ccw) 868 return; 869 870 config_area = ccw_device_dma_zalloc(vcdev->cdev, 871 VIRTIO_CCW_CONFIG_SIZE); 872 if (!config_area) 873 goto out_free; 874 875 /* Read the config area from the host. */ 876 ccw->cmd_code = CCW_CMD_READ_CONF; 877 ccw->flags = 0; 878 ccw->count = offset + len; 879 ccw->cda = (__u32)(unsigned long)config_area; 880 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG); 881 if (ret) 882 goto out_free; 883 884 spin_lock_irqsave(&vcdev->lock, flags); 885 memcpy(vcdev->config, config_area, offset + len); 886 if (vcdev->config_ready < offset + len) 887 vcdev->config_ready = offset + len; 888 spin_unlock_irqrestore(&vcdev->lock, flags); 889 if (buf) 890 memcpy(buf, config_area + offset, len); 891 892 out_free: 893 ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE); 894 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 895 } 896 897 static void virtio_ccw_set_config(struct virtio_device *vdev, 898 unsigned int offset, const void *buf, 899 unsigned len) 900 { 901 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 902 struct ccw1 *ccw; 903 void *config_area; 904 unsigned long flags; 905 906 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 907 if (!ccw) 908 return; 909 910 config_area = ccw_device_dma_zalloc(vcdev->cdev, 911 VIRTIO_CCW_CONFIG_SIZE); 912 if (!config_area) 913 goto out_free; 914 915 /* Make sure we don't overwrite fields. */ 916 if (vcdev->config_ready < offset) 917 virtio_ccw_get_config(vdev, 0, NULL, offset); 918 spin_lock_irqsave(&vcdev->lock, flags); 919 memcpy(&vcdev->config[offset], buf, len); 920 /* Write the config area to the host. */ 921 memcpy(config_area, vcdev->config, sizeof(vcdev->config)); 922 spin_unlock_irqrestore(&vcdev->lock, flags); 923 ccw->cmd_code = CCW_CMD_WRITE_CONF; 924 ccw->flags = 0; 925 ccw->count = offset + len; 926 ccw->cda = (__u32)(unsigned long)config_area; 927 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG); 928 929 out_free: 930 ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE); 931 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 932 } 933 934 static u8 virtio_ccw_get_status(struct virtio_device *vdev) 935 { 936 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 937 u8 old_status = vcdev->dma_area->status; 938 struct ccw1 *ccw; 939 940 if (vcdev->revision < 2) 941 return vcdev->dma_area->status; 942 943 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 944 if (!ccw) 945 return old_status; 946 947 ccw->cmd_code = CCW_CMD_READ_STATUS; 948 ccw->flags = 0; 949 ccw->count = sizeof(vcdev->dma_area->status); 950 ccw->cda = (__u32)(unsigned long)&vcdev->dma_area->status; 951 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS); 952 /* 953 * If the channel program failed (should only happen if the device 954 * was hotunplugged, and then we clean up via the machine check 955 * handler anyway), vcdev->dma_area->status was not overwritten and we just 956 * return the old status, which is fine. 957 */ 958 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 959 960 return vcdev->dma_area->status; 961 } 962 963 static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status) 964 { 965 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 966 u8 old_status = vcdev->dma_area->status; 967 struct ccw1 *ccw; 968 int ret; 969 970 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 971 if (!ccw) 972 return; 973 974 /* Write the status to the host. */ 975 vcdev->dma_area->status = status; 976 ccw->cmd_code = CCW_CMD_WRITE_STATUS; 977 ccw->flags = 0; 978 ccw->count = sizeof(status); 979 ccw->cda = (__u32)(unsigned long)&vcdev->dma_area->status; 980 /* We use ssch for setting the status which is a serializing 981 * instruction that guarantees the memory writes have 982 * completed before ssch. 983 */ 984 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS); 985 /* Write failed? We assume status is unchanged. */ 986 if (ret) 987 vcdev->dma_area->status = old_status; 988 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 989 } 990 991 static const char *virtio_ccw_bus_name(struct virtio_device *vdev) 992 { 993 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 994 995 return dev_name(&vcdev->cdev->dev); 996 } 997 998 static void virtio_ccw_synchronize_cbs(struct virtio_device *vdev) 999 { 1000 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 1001 struct airq_info *info = vcdev->airq_info; 1002 1003 if (info) { 1004 /* 1005 * This device uses adapter interrupts: synchronize with 1006 * vring_interrupt() called by virtio_airq_handler() 1007 * via the indicator area lock. 1008 */ 1009 write_lock_irq(&info->lock); 1010 write_unlock_irq(&info->lock); 1011 } else { 1012 /* This device uses classic interrupts: synchronize 1013 * with vring_interrupt() called by 1014 * virtio_ccw_int_handler() via the per-device 1015 * irq_lock 1016 */ 1017 write_lock_irq(&vcdev->irq_lock); 1018 write_unlock_irq(&vcdev->irq_lock); 1019 } 1020 } 1021 1022 static const struct virtio_config_ops virtio_ccw_config_ops = { 1023 .get_features = virtio_ccw_get_features, 1024 .finalize_features = virtio_ccw_finalize_features, 1025 .get = virtio_ccw_get_config, 1026 .set = virtio_ccw_set_config, 1027 .get_status = virtio_ccw_get_status, 1028 .set_status = virtio_ccw_set_status, 1029 .reset = virtio_ccw_reset, 1030 .find_vqs = virtio_ccw_find_vqs, 1031 .del_vqs = virtio_ccw_del_vqs, 1032 .bus_name = virtio_ccw_bus_name, 1033 .synchronize_cbs = virtio_ccw_synchronize_cbs, 1034 }; 1035 1036 1037 /* 1038 * ccw bus driver related functions 1039 */ 1040 1041 static void virtio_ccw_release_dev(struct device *_d) 1042 { 1043 struct virtio_device *dev = dev_to_virtio(_d); 1044 struct virtio_ccw_device *vcdev = to_vc_device(dev); 1045 1046 ccw_device_dma_free(vcdev->cdev, vcdev->dma_area, 1047 sizeof(*vcdev->dma_area)); 1048 kfree(vcdev); 1049 } 1050 1051 static int irb_is_error(struct irb *irb) 1052 { 1053 if (scsw_cstat(&irb->scsw) != 0) 1054 return 1; 1055 if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) 1056 return 1; 1057 if (scsw_cc(&irb->scsw) != 0) 1058 return 1; 1059 return 0; 1060 } 1061 1062 static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev, 1063 int index) 1064 { 1065 struct virtio_ccw_vq_info *info; 1066 unsigned long flags; 1067 struct virtqueue *vq; 1068 1069 vq = NULL; 1070 spin_lock_irqsave(&vcdev->lock, flags); 1071 list_for_each_entry(info, &vcdev->virtqueues, node) { 1072 if (info->vq->index == index) { 1073 vq = info->vq; 1074 break; 1075 } 1076 } 1077 spin_unlock_irqrestore(&vcdev->lock, flags); 1078 return vq; 1079 } 1080 1081 static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev, 1082 __u32 activity) 1083 { 1084 if (vcdev->curr_io & activity) { 1085 switch (activity) { 1086 case VIRTIO_CCW_DOING_READ_FEAT: 1087 case VIRTIO_CCW_DOING_WRITE_FEAT: 1088 case VIRTIO_CCW_DOING_READ_CONFIG: 1089 case VIRTIO_CCW_DOING_WRITE_CONFIG: 1090 case VIRTIO_CCW_DOING_WRITE_STATUS: 1091 case VIRTIO_CCW_DOING_READ_STATUS: 1092 case VIRTIO_CCW_DOING_SET_VQ: 1093 case VIRTIO_CCW_DOING_SET_IND: 1094 case VIRTIO_CCW_DOING_SET_CONF_IND: 1095 case VIRTIO_CCW_DOING_RESET: 1096 case VIRTIO_CCW_DOING_READ_VQ_CONF: 1097 case VIRTIO_CCW_DOING_SET_IND_ADAPTER: 1098 case VIRTIO_CCW_DOING_SET_VIRTIO_REV: 1099 vcdev->curr_io &= ~activity; 1100 wake_up(&vcdev->wait_q); 1101 break; 1102 default: 1103 /* don't know what to do... */ 1104 dev_warn(&vcdev->cdev->dev, 1105 "Suspicious activity '%08x'\n", activity); 1106 WARN_ON(1); 1107 break; 1108 } 1109 } 1110 } 1111 1112 static void virtio_ccw_int_handler(struct ccw_device *cdev, 1113 unsigned long intparm, 1114 struct irb *irb) 1115 { 1116 __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK; 1117 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1118 int i; 1119 struct virtqueue *vq; 1120 1121 if (!vcdev) 1122 return; 1123 if (IS_ERR(irb)) { 1124 vcdev->err = PTR_ERR(irb); 1125 virtio_ccw_check_activity(vcdev, activity); 1126 /* Don't poke around indicators, something's wrong. */ 1127 return; 1128 } 1129 /* Check if it's a notification from the host. */ 1130 if ((intparm == 0) && 1131 (scsw_stctl(&irb->scsw) == 1132 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) { 1133 /* OK */ 1134 } 1135 if (irb_is_error(irb)) { 1136 /* Command reject? */ 1137 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) && 1138 (irb->ecw[0] & SNS0_CMD_REJECT)) 1139 vcdev->err = -EOPNOTSUPP; 1140 else 1141 /* Map everything else to -EIO. */ 1142 vcdev->err = -EIO; 1143 } 1144 virtio_ccw_check_activity(vcdev, activity); 1145 #ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION 1146 /* 1147 * Paired with virtio_ccw_synchronize_cbs() and interrupts are 1148 * disabled here. 1149 */ 1150 read_lock(&vcdev->irq_lock); 1151 #endif 1152 for_each_set_bit(i, indicators(vcdev), 1153 sizeof(*indicators(vcdev)) * BITS_PER_BYTE) { 1154 /* The bit clear must happen before the vring kick. */ 1155 clear_bit(i, indicators(vcdev)); 1156 barrier(); 1157 vq = virtio_ccw_vq_by_ind(vcdev, i); 1158 vring_interrupt(0, vq); 1159 } 1160 #ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION 1161 read_unlock(&vcdev->irq_lock); 1162 #endif 1163 if (test_bit(0, indicators2(vcdev))) { 1164 virtio_config_changed(&vcdev->vdev); 1165 clear_bit(0, indicators2(vcdev)); 1166 } 1167 } 1168 1169 /* 1170 * We usually want to autoonline all devices, but give the admin 1171 * a way to exempt devices from this. 1172 */ 1173 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ 1174 (8*sizeof(long))) 1175 static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS]; 1176 1177 static char *no_auto = ""; 1178 1179 module_param(no_auto, charp, 0444); 1180 MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined"); 1181 1182 static int virtio_ccw_check_autoonline(struct ccw_device *cdev) 1183 { 1184 struct ccw_dev_id id; 1185 1186 ccw_device_get_id(cdev, &id); 1187 if (test_bit(id.devno, devs_no_auto[id.ssid])) 1188 return 0; 1189 return 1; 1190 } 1191 1192 static void virtio_ccw_auto_online(void *data, async_cookie_t cookie) 1193 { 1194 struct ccw_device *cdev = data; 1195 int ret; 1196 1197 ret = ccw_device_set_online(cdev); 1198 if (ret) 1199 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret); 1200 } 1201 1202 static int virtio_ccw_probe(struct ccw_device *cdev) 1203 { 1204 cdev->handler = virtio_ccw_int_handler; 1205 1206 if (virtio_ccw_check_autoonline(cdev)) 1207 async_schedule(virtio_ccw_auto_online, cdev); 1208 return 0; 1209 } 1210 1211 static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev) 1212 { 1213 unsigned long flags; 1214 struct virtio_ccw_device *vcdev; 1215 1216 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1217 vcdev = dev_get_drvdata(&cdev->dev); 1218 if (!vcdev || vcdev->going_away) { 1219 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1220 return NULL; 1221 } 1222 vcdev->going_away = true; 1223 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1224 return vcdev; 1225 } 1226 1227 static void virtio_ccw_remove(struct ccw_device *cdev) 1228 { 1229 unsigned long flags; 1230 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1231 1232 if (vcdev && cdev->online) { 1233 if (vcdev->device_lost) 1234 virtio_break_device(&vcdev->vdev); 1235 unregister_virtio_device(&vcdev->vdev); 1236 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1237 dev_set_drvdata(&cdev->dev, NULL); 1238 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1239 } 1240 cdev->handler = NULL; 1241 } 1242 1243 static int virtio_ccw_offline(struct ccw_device *cdev) 1244 { 1245 unsigned long flags; 1246 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1247 1248 if (!vcdev) 1249 return 0; 1250 if (vcdev->device_lost) 1251 virtio_break_device(&vcdev->vdev); 1252 unregister_virtio_device(&vcdev->vdev); 1253 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1254 dev_set_drvdata(&cdev->dev, NULL); 1255 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1256 return 0; 1257 } 1258 1259 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev) 1260 { 1261 struct virtio_rev_info *rev; 1262 struct ccw1 *ccw; 1263 int ret; 1264 1265 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 1266 if (!ccw) 1267 return -ENOMEM; 1268 rev = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*rev)); 1269 if (!rev) { 1270 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 1271 return -ENOMEM; 1272 } 1273 1274 /* Set transport revision */ 1275 ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV; 1276 ccw->flags = 0; 1277 ccw->count = sizeof(*rev); 1278 ccw->cda = (__u32)(unsigned long)rev; 1279 1280 vcdev->revision = VIRTIO_CCW_REV_MAX; 1281 do { 1282 rev->revision = vcdev->revision; 1283 /* none of our supported revisions carry payload */ 1284 rev->length = 0; 1285 ret = ccw_io_helper(vcdev, ccw, 1286 VIRTIO_CCW_DOING_SET_VIRTIO_REV); 1287 if (ret == -EOPNOTSUPP) { 1288 if (vcdev->revision == 0) 1289 /* 1290 * The host device does not support setting 1291 * the revision: let's operate it in legacy 1292 * mode. 1293 */ 1294 ret = 0; 1295 else 1296 vcdev->revision--; 1297 } 1298 } while (ret == -EOPNOTSUPP); 1299 1300 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 1301 ccw_device_dma_free(vcdev->cdev, rev, sizeof(*rev)); 1302 return ret; 1303 } 1304 1305 static int virtio_ccw_online(struct ccw_device *cdev) 1306 { 1307 int ret; 1308 struct virtio_ccw_device *vcdev; 1309 unsigned long flags; 1310 1311 vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL); 1312 if (!vcdev) { 1313 dev_warn(&cdev->dev, "Could not get memory for virtio\n"); 1314 ret = -ENOMEM; 1315 goto out_free; 1316 } 1317 vcdev->vdev.dev.parent = &cdev->dev; 1318 vcdev->cdev = cdev; 1319 vcdev->dma_area = ccw_device_dma_zalloc(vcdev->cdev, 1320 sizeof(*vcdev->dma_area)); 1321 if (!vcdev->dma_area) { 1322 ret = -ENOMEM; 1323 goto out_free; 1324 } 1325 1326 vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */ 1327 1328 vcdev->vdev.dev.release = virtio_ccw_release_dev; 1329 vcdev->vdev.config = &virtio_ccw_config_ops; 1330 init_waitqueue_head(&vcdev->wait_q); 1331 INIT_LIST_HEAD(&vcdev->virtqueues); 1332 spin_lock_init(&vcdev->lock); 1333 rwlock_init(&vcdev->irq_lock); 1334 mutex_init(&vcdev->io_lock); 1335 1336 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1337 dev_set_drvdata(&cdev->dev, vcdev); 1338 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1339 vcdev->vdev.id.vendor = cdev->id.cu_type; 1340 vcdev->vdev.id.device = cdev->id.cu_model; 1341 1342 ret = virtio_ccw_set_transport_rev(vcdev); 1343 if (ret) 1344 goto out_free; 1345 1346 ret = register_virtio_device(&vcdev->vdev); 1347 if (ret) { 1348 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n", 1349 ret); 1350 goto out_put; 1351 } 1352 return 0; 1353 out_put: 1354 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1355 dev_set_drvdata(&cdev->dev, NULL); 1356 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1357 put_device(&vcdev->vdev.dev); 1358 return ret; 1359 out_free: 1360 if (vcdev) { 1361 ccw_device_dma_free(vcdev->cdev, vcdev->dma_area, 1362 sizeof(*vcdev->dma_area)); 1363 } 1364 kfree(vcdev); 1365 return ret; 1366 } 1367 1368 static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event) 1369 { 1370 int rc; 1371 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1372 1373 /* 1374 * Make sure vcdev is set 1375 * i.e. set_offline/remove callback not already running 1376 */ 1377 if (!vcdev) 1378 return NOTIFY_DONE; 1379 1380 switch (event) { 1381 case CIO_GONE: 1382 vcdev->device_lost = true; 1383 rc = NOTIFY_DONE; 1384 break; 1385 case CIO_OPER: 1386 rc = NOTIFY_OK; 1387 break; 1388 default: 1389 rc = NOTIFY_DONE; 1390 break; 1391 } 1392 return rc; 1393 } 1394 1395 static struct ccw_device_id virtio_ids[] = { 1396 { CCW_DEVICE(0x3832, 0) }, 1397 {}, 1398 }; 1399 1400 static struct ccw_driver virtio_ccw_driver = { 1401 .driver = { 1402 .owner = THIS_MODULE, 1403 .name = "virtio_ccw", 1404 }, 1405 .ids = virtio_ids, 1406 .probe = virtio_ccw_probe, 1407 .remove = virtio_ccw_remove, 1408 .set_offline = virtio_ccw_offline, 1409 .set_online = virtio_ccw_online, 1410 .notify = virtio_ccw_cio_notify, 1411 .int_class = IRQIO_VIR, 1412 }; 1413 1414 static int __init pure_hex(char **cp, unsigned int *val, int min_digit, 1415 int max_digit, int max_val) 1416 { 1417 int diff; 1418 1419 diff = 0; 1420 *val = 0; 1421 1422 while (diff <= max_digit) { 1423 int value = hex_to_bin(**cp); 1424 1425 if (value < 0) 1426 break; 1427 *val = *val * 16 + value; 1428 (*cp)++; 1429 diff++; 1430 } 1431 1432 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) 1433 return 1; 1434 1435 return 0; 1436 } 1437 1438 static int __init parse_busid(char *str, unsigned int *cssid, 1439 unsigned int *ssid, unsigned int *devno) 1440 { 1441 char *str_work; 1442 int rc, ret; 1443 1444 rc = 1; 1445 1446 if (*str == '\0') 1447 goto out; 1448 1449 str_work = str; 1450 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); 1451 if (ret || (str_work[0] != '.')) 1452 goto out; 1453 str_work++; 1454 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); 1455 if (ret || (str_work[0] != '.')) 1456 goto out; 1457 str_work++; 1458 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); 1459 if (ret || (str_work[0] != '\0')) 1460 goto out; 1461 1462 rc = 0; 1463 out: 1464 return rc; 1465 } 1466 1467 static void __init no_auto_parse(void) 1468 { 1469 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; 1470 char *parm, *str; 1471 int rc; 1472 1473 str = no_auto; 1474 while ((parm = strsep(&str, ","))) { 1475 rc = parse_busid(strsep(&parm, "-"), &from_cssid, 1476 &from_ssid, &from); 1477 if (rc) 1478 continue; 1479 if (parm != NULL) { 1480 rc = parse_busid(parm, &to_cssid, 1481 &to_ssid, &to); 1482 if ((from_ssid > to_ssid) || 1483 ((from_ssid == to_ssid) && (from > to))) 1484 rc = -EINVAL; 1485 } else { 1486 to_cssid = from_cssid; 1487 to_ssid = from_ssid; 1488 to = from; 1489 } 1490 if (rc) 1491 continue; 1492 while ((from_ssid < to_ssid) || 1493 ((from_ssid == to_ssid) && (from <= to))) { 1494 set_bit(from, devs_no_auto[from_ssid]); 1495 from++; 1496 if (from > __MAX_SUBCHANNEL) { 1497 from_ssid++; 1498 from = 0; 1499 } 1500 } 1501 } 1502 } 1503 1504 static int __init virtio_ccw_init(void) 1505 { 1506 int rc; 1507 1508 /* parse no_auto string before we do anything further */ 1509 no_auto_parse(); 1510 1511 summary_indicators = cio_dma_zalloc(MAX_AIRQ_AREAS); 1512 if (!summary_indicators) 1513 return -ENOMEM; 1514 rc = ccw_driver_register(&virtio_ccw_driver); 1515 if (rc) 1516 cio_dma_free(summary_indicators, MAX_AIRQ_AREAS); 1517 return rc; 1518 } 1519 device_initcall(virtio_ccw_init); 1520