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 const bool *ctx, 641 struct irq_affinity *desc) 642 { 643 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 644 unsigned long *indicatorp = NULL; 645 int ret, i, queue_idx = 0; 646 struct ccw1 *ccw; 647 648 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 649 if (!ccw) 650 return -ENOMEM; 651 652 for (i = 0; i < nvqs; ++i) { 653 if (!names[i]) { 654 vqs[i] = NULL; 655 continue; 656 } 657 658 vqs[i] = virtio_ccw_setup_vq(vdev, queue_idx++, callbacks[i], 659 names[i], ctx ? ctx[i] : false, 660 ccw); 661 if (IS_ERR(vqs[i])) { 662 ret = PTR_ERR(vqs[i]); 663 vqs[i] = NULL; 664 goto out; 665 } 666 } 667 ret = -ENOMEM; 668 /* 669 * We need a data area under 2G to communicate. Our payload is 670 * the address of the indicators. 671 */ 672 indicatorp = ccw_device_dma_zalloc(vcdev->cdev, 673 sizeof(indicators(vcdev))); 674 if (!indicatorp) 675 goto out; 676 *indicatorp = (unsigned long) indicators(vcdev); 677 if (vcdev->is_thinint) { 678 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw); 679 if (ret) 680 /* no error, just fall back to legacy interrupts */ 681 vcdev->is_thinint = false; 682 } 683 if (!vcdev->is_thinint) { 684 /* Register queue indicators with host. */ 685 *indicators(vcdev) = 0; 686 ccw->cmd_code = CCW_CMD_SET_IND; 687 ccw->flags = 0; 688 ccw->count = sizeof(indicators(vcdev)); 689 ccw->cda = (__u32)(unsigned long) indicatorp; 690 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND); 691 if (ret) 692 goto out; 693 } 694 /* Register indicators2 with host for config changes */ 695 *indicatorp = (unsigned long) indicators2(vcdev); 696 *indicators2(vcdev) = 0; 697 ccw->cmd_code = CCW_CMD_SET_CONF_IND; 698 ccw->flags = 0; 699 ccw->count = sizeof(indicators2(vcdev)); 700 ccw->cda = (__u32)(unsigned long) indicatorp; 701 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND); 702 if (ret) 703 goto out; 704 705 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 return 0; 710 out: 711 if (indicatorp) 712 ccw_device_dma_free(vcdev->cdev, indicatorp, 713 sizeof(indicators(vcdev))); 714 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 715 virtio_ccw_del_vqs(vdev); 716 return ret; 717 } 718 719 static void virtio_ccw_reset(struct virtio_device *vdev) 720 { 721 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 722 struct ccw1 *ccw; 723 724 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 725 if (!ccw) 726 return; 727 728 /* Zero status bits. */ 729 vcdev->dma_area->status = 0; 730 731 /* Send a reset ccw on device. */ 732 ccw->cmd_code = CCW_CMD_VDEV_RESET; 733 ccw->flags = 0; 734 ccw->count = 0; 735 ccw->cda = 0; 736 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET); 737 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 738 } 739 740 static u64 virtio_ccw_get_features(struct virtio_device *vdev) 741 { 742 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 743 struct virtio_feature_desc *features; 744 int ret; 745 u64 rc; 746 struct ccw1 *ccw; 747 748 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 749 if (!ccw) 750 return 0; 751 752 features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features)); 753 if (!features) { 754 rc = 0; 755 goto out_free; 756 } 757 /* Read the feature bits from the host. */ 758 features->index = 0; 759 ccw->cmd_code = CCW_CMD_READ_FEAT; 760 ccw->flags = 0; 761 ccw->count = sizeof(*features); 762 ccw->cda = (__u32)(unsigned long)features; 763 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 764 if (ret) { 765 rc = 0; 766 goto out_free; 767 } 768 769 rc = le32_to_cpu(features->features); 770 771 if (vcdev->revision == 0) 772 goto out_free; 773 774 /* Read second half of the feature bits from the host. */ 775 features->index = 1; 776 ccw->cmd_code = CCW_CMD_READ_FEAT; 777 ccw->flags = 0; 778 ccw->count = sizeof(*features); 779 ccw->cda = (__u32)(unsigned long)features; 780 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 781 if (ret == 0) 782 rc |= (u64)le32_to_cpu(features->features) << 32; 783 784 out_free: 785 ccw_device_dma_free(vcdev->cdev, features, sizeof(*features)); 786 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 787 return rc; 788 } 789 790 static void ccw_transport_features(struct virtio_device *vdev) 791 { 792 /* 793 * Currently nothing to do here. 794 */ 795 } 796 797 static int virtio_ccw_finalize_features(struct virtio_device *vdev) 798 { 799 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 800 struct virtio_feature_desc *features; 801 struct ccw1 *ccw; 802 int ret; 803 804 if (vcdev->revision >= 1 && 805 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { 806 dev_err(&vdev->dev, "virtio: device uses revision 1 " 807 "but does not have VIRTIO_F_VERSION_1\n"); 808 return -EINVAL; 809 } 810 811 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 812 if (!ccw) 813 return -ENOMEM; 814 815 features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features)); 816 if (!features) { 817 ret = -ENOMEM; 818 goto out_free; 819 } 820 /* Give virtio_ring a chance to accept features. */ 821 vring_transport_features(vdev); 822 823 /* Give virtio_ccw a chance to accept features. */ 824 ccw_transport_features(vdev); 825 826 features->index = 0; 827 features->features = cpu_to_le32((u32)vdev->features); 828 /* Write the first half of the feature bits to the host. */ 829 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 830 ccw->flags = 0; 831 ccw->count = sizeof(*features); 832 ccw->cda = (__u32)(unsigned long)features; 833 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 834 if (ret) 835 goto out_free; 836 837 if (vcdev->revision == 0) 838 goto out_free; 839 840 features->index = 1; 841 features->features = cpu_to_le32(vdev->features >> 32); 842 /* Write the second half of the feature bits to the host. */ 843 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 844 ccw->flags = 0; 845 ccw->count = sizeof(*features); 846 ccw->cda = (__u32)(unsigned long)features; 847 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 848 849 out_free: 850 ccw_device_dma_free(vcdev->cdev, features, sizeof(*features)); 851 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 852 853 return ret; 854 } 855 856 static void virtio_ccw_get_config(struct virtio_device *vdev, 857 unsigned int offset, void *buf, unsigned len) 858 { 859 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 860 int ret; 861 struct ccw1 *ccw; 862 void *config_area; 863 unsigned long flags; 864 865 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 866 if (!ccw) 867 return; 868 869 config_area = ccw_device_dma_zalloc(vcdev->cdev, 870 VIRTIO_CCW_CONFIG_SIZE); 871 if (!config_area) 872 goto out_free; 873 874 /* Read the config area from the host. */ 875 ccw->cmd_code = CCW_CMD_READ_CONF; 876 ccw->flags = 0; 877 ccw->count = offset + len; 878 ccw->cda = (__u32)(unsigned long)config_area; 879 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG); 880 if (ret) 881 goto out_free; 882 883 spin_lock_irqsave(&vcdev->lock, flags); 884 memcpy(vcdev->config, config_area, offset + len); 885 if (vcdev->config_ready < offset + len) 886 vcdev->config_ready = offset + len; 887 spin_unlock_irqrestore(&vcdev->lock, flags); 888 if (buf) 889 memcpy(buf, config_area + offset, len); 890 891 out_free: 892 ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE); 893 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 894 } 895 896 static void virtio_ccw_set_config(struct virtio_device *vdev, 897 unsigned int offset, const void *buf, 898 unsigned len) 899 { 900 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 901 struct ccw1 *ccw; 902 void *config_area; 903 unsigned long flags; 904 905 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 906 if (!ccw) 907 return; 908 909 config_area = ccw_device_dma_zalloc(vcdev->cdev, 910 VIRTIO_CCW_CONFIG_SIZE); 911 if (!config_area) 912 goto out_free; 913 914 /* Make sure we don't overwrite fields. */ 915 if (vcdev->config_ready < offset) 916 virtio_ccw_get_config(vdev, 0, NULL, offset); 917 spin_lock_irqsave(&vcdev->lock, flags); 918 memcpy(&vcdev->config[offset], buf, len); 919 /* Write the config area to the host. */ 920 memcpy(config_area, vcdev->config, sizeof(vcdev->config)); 921 spin_unlock_irqrestore(&vcdev->lock, flags); 922 ccw->cmd_code = CCW_CMD_WRITE_CONF; 923 ccw->flags = 0; 924 ccw->count = offset + len; 925 ccw->cda = (__u32)(unsigned long)config_area; 926 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG); 927 928 out_free: 929 ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE); 930 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 931 } 932 933 static u8 virtio_ccw_get_status(struct virtio_device *vdev) 934 { 935 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 936 u8 old_status = vcdev->dma_area->status; 937 struct ccw1 *ccw; 938 939 if (vcdev->revision < 2) 940 return vcdev->dma_area->status; 941 942 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 943 if (!ccw) 944 return old_status; 945 946 ccw->cmd_code = CCW_CMD_READ_STATUS; 947 ccw->flags = 0; 948 ccw->count = sizeof(vcdev->dma_area->status); 949 ccw->cda = (__u32)(unsigned long)&vcdev->dma_area->status; 950 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS); 951 /* 952 * If the channel program failed (should only happen if the device 953 * was hotunplugged, and then we clean up via the machine check 954 * handler anyway), vcdev->dma_area->status was not overwritten and we just 955 * return the old status, which is fine. 956 */ 957 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 958 959 return vcdev->dma_area->status; 960 } 961 962 static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status) 963 { 964 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 965 u8 old_status = vcdev->dma_area->status; 966 struct ccw1 *ccw; 967 int ret; 968 969 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 970 if (!ccw) 971 return; 972 973 /* Write the status to the host. */ 974 vcdev->dma_area->status = status; 975 ccw->cmd_code = CCW_CMD_WRITE_STATUS; 976 ccw->flags = 0; 977 ccw->count = sizeof(status); 978 ccw->cda = (__u32)(unsigned long)&vcdev->dma_area->status; 979 /* We use ssch for setting the status which is a serializing 980 * instruction that guarantees the memory writes have 981 * completed before ssch. 982 */ 983 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS); 984 /* Write failed? We assume status is unchanged. */ 985 if (ret) 986 vcdev->dma_area->status = old_status; 987 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 988 } 989 990 static const char *virtio_ccw_bus_name(struct virtio_device *vdev) 991 { 992 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 993 994 return dev_name(&vcdev->cdev->dev); 995 } 996 997 static void virtio_ccw_synchronize_cbs(struct virtio_device *vdev) 998 { 999 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 1000 struct airq_info *info = vcdev->airq_info; 1001 1002 if (info) { 1003 /* 1004 * This device uses adapter interrupts: synchronize with 1005 * vring_interrupt() called by virtio_airq_handler() 1006 * via the indicator area lock. 1007 */ 1008 write_lock_irq(&info->lock); 1009 write_unlock_irq(&info->lock); 1010 } else { 1011 /* This device uses classic interrupts: synchronize 1012 * with vring_interrupt() called by 1013 * virtio_ccw_int_handler() via the per-device 1014 * irq_lock 1015 */ 1016 write_lock_irq(&vcdev->irq_lock); 1017 write_unlock_irq(&vcdev->irq_lock); 1018 } 1019 } 1020 1021 static const struct virtio_config_ops virtio_ccw_config_ops = { 1022 .get_features = virtio_ccw_get_features, 1023 .finalize_features = virtio_ccw_finalize_features, 1024 .get = virtio_ccw_get_config, 1025 .set = virtio_ccw_set_config, 1026 .get_status = virtio_ccw_get_status, 1027 .set_status = virtio_ccw_set_status, 1028 .reset = virtio_ccw_reset, 1029 .find_vqs = virtio_ccw_find_vqs, 1030 .del_vqs = virtio_ccw_del_vqs, 1031 .bus_name = virtio_ccw_bus_name, 1032 .synchronize_cbs = virtio_ccw_synchronize_cbs, 1033 }; 1034 1035 1036 /* 1037 * ccw bus driver related functions 1038 */ 1039 1040 static void virtio_ccw_release_dev(struct device *_d) 1041 { 1042 struct virtio_device *dev = dev_to_virtio(_d); 1043 struct virtio_ccw_device *vcdev = to_vc_device(dev); 1044 1045 ccw_device_dma_free(vcdev->cdev, vcdev->dma_area, 1046 sizeof(*vcdev->dma_area)); 1047 kfree(vcdev); 1048 } 1049 1050 static int irb_is_error(struct irb *irb) 1051 { 1052 if (scsw_cstat(&irb->scsw) != 0) 1053 return 1; 1054 if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) 1055 return 1; 1056 if (scsw_cc(&irb->scsw) != 0) 1057 return 1; 1058 return 0; 1059 } 1060 1061 static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev, 1062 int index) 1063 { 1064 struct virtio_ccw_vq_info *info; 1065 unsigned long flags; 1066 struct virtqueue *vq; 1067 1068 vq = NULL; 1069 spin_lock_irqsave(&vcdev->lock, flags); 1070 list_for_each_entry(info, &vcdev->virtqueues, node) { 1071 if (info->vq->index == index) { 1072 vq = info->vq; 1073 break; 1074 } 1075 } 1076 spin_unlock_irqrestore(&vcdev->lock, flags); 1077 return vq; 1078 } 1079 1080 static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev, 1081 __u32 activity) 1082 { 1083 if (vcdev->curr_io & activity) { 1084 switch (activity) { 1085 case VIRTIO_CCW_DOING_READ_FEAT: 1086 case VIRTIO_CCW_DOING_WRITE_FEAT: 1087 case VIRTIO_CCW_DOING_READ_CONFIG: 1088 case VIRTIO_CCW_DOING_WRITE_CONFIG: 1089 case VIRTIO_CCW_DOING_WRITE_STATUS: 1090 case VIRTIO_CCW_DOING_READ_STATUS: 1091 case VIRTIO_CCW_DOING_SET_VQ: 1092 case VIRTIO_CCW_DOING_SET_IND: 1093 case VIRTIO_CCW_DOING_SET_CONF_IND: 1094 case VIRTIO_CCW_DOING_RESET: 1095 case VIRTIO_CCW_DOING_READ_VQ_CONF: 1096 case VIRTIO_CCW_DOING_SET_IND_ADAPTER: 1097 case VIRTIO_CCW_DOING_SET_VIRTIO_REV: 1098 vcdev->curr_io &= ~activity; 1099 wake_up(&vcdev->wait_q); 1100 break; 1101 default: 1102 /* don't know what to do... */ 1103 dev_warn(&vcdev->cdev->dev, 1104 "Suspicious activity '%08x'\n", activity); 1105 WARN_ON(1); 1106 break; 1107 } 1108 } 1109 } 1110 1111 static void virtio_ccw_int_handler(struct ccw_device *cdev, 1112 unsigned long intparm, 1113 struct irb *irb) 1114 { 1115 __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK; 1116 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1117 int i; 1118 struct virtqueue *vq; 1119 1120 if (!vcdev) 1121 return; 1122 if (IS_ERR(irb)) { 1123 vcdev->err = PTR_ERR(irb); 1124 virtio_ccw_check_activity(vcdev, activity); 1125 /* Don't poke around indicators, something's wrong. */ 1126 return; 1127 } 1128 /* Check if it's a notification from the host. */ 1129 if ((intparm == 0) && 1130 (scsw_stctl(&irb->scsw) == 1131 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) { 1132 /* OK */ 1133 } 1134 if (irb_is_error(irb)) { 1135 /* Command reject? */ 1136 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) && 1137 (irb->ecw[0] & SNS0_CMD_REJECT)) 1138 vcdev->err = -EOPNOTSUPP; 1139 else 1140 /* Map everything else to -EIO. */ 1141 vcdev->err = -EIO; 1142 } 1143 virtio_ccw_check_activity(vcdev, activity); 1144 #ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION 1145 /* 1146 * Paired with virtio_ccw_synchronize_cbs() and interrupts are 1147 * disabled here. 1148 */ 1149 read_lock(&vcdev->irq_lock); 1150 #endif 1151 for_each_set_bit(i, indicators(vcdev), 1152 sizeof(*indicators(vcdev)) * BITS_PER_BYTE) { 1153 /* The bit clear must happen before the vring kick. */ 1154 clear_bit(i, indicators(vcdev)); 1155 barrier(); 1156 vq = virtio_ccw_vq_by_ind(vcdev, i); 1157 vring_interrupt(0, vq); 1158 } 1159 #ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION 1160 read_unlock(&vcdev->irq_lock); 1161 #endif 1162 if (test_bit(0, indicators2(vcdev))) { 1163 virtio_config_changed(&vcdev->vdev); 1164 clear_bit(0, indicators2(vcdev)); 1165 } 1166 } 1167 1168 /* 1169 * We usually want to autoonline all devices, but give the admin 1170 * a way to exempt devices from this. 1171 */ 1172 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ 1173 (8*sizeof(long))) 1174 static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS]; 1175 1176 static char *no_auto = ""; 1177 1178 module_param(no_auto, charp, 0444); 1179 MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined"); 1180 1181 static int virtio_ccw_check_autoonline(struct ccw_device *cdev) 1182 { 1183 struct ccw_dev_id id; 1184 1185 ccw_device_get_id(cdev, &id); 1186 if (test_bit(id.devno, devs_no_auto[id.ssid])) 1187 return 0; 1188 return 1; 1189 } 1190 1191 static void virtio_ccw_auto_online(void *data, async_cookie_t cookie) 1192 { 1193 struct ccw_device *cdev = data; 1194 int ret; 1195 1196 ret = ccw_device_set_online(cdev); 1197 if (ret) 1198 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret); 1199 } 1200 1201 static int virtio_ccw_probe(struct ccw_device *cdev) 1202 { 1203 cdev->handler = virtio_ccw_int_handler; 1204 1205 if (virtio_ccw_check_autoonline(cdev)) 1206 async_schedule(virtio_ccw_auto_online, cdev); 1207 return 0; 1208 } 1209 1210 static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev) 1211 { 1212 unsigned long flags; 1213 struct virtio_ccw_device *vcdev; 1214 1215 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1216 vcdev = dev_get_drvdata(&cdev->dev); 1217 if (!vcdev || vcdev->going_away) { 1218 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1219 return NULL; 1220 } 1221 vcdev->going_away = true; 1222 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1223 return vcdev; 1224 } 1225 1226 static void virtio_ccw_remove(struct ccw_device *cdev) 1227 { 1228 unsigned long flags; 1229 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1230 1231 if (vcdev && cdev->online) { 1232 if (vcdev->device_lost) 1233 virtio_break_device(&vcdev->vdev); 1234 unregister_virtio_device(&vcdev->vdev); 1235 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1236 dev_set_drvdata(&cdev->dev, NULL); 1237 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1238 } 1239 cdev->handler = NULL; 1240 } 1241 1242 static int virtio_ccw_offline(struct ccw_device *cdev) 1243 { 1244 unsigned long flags; 1245 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1246 1247 if (!vcdev) 1248 return 0; 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 return 0; 1256 } 1257 1258 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev) 1259 { 1260 struct virtio_rev_info *rev; 1261 struct ccw1 *ccw; 1262 int ret; 1263 1264 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 1265 if (!ccw) 1266 return -ENOMEM; 1267 rev = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*rev)); 1268 if (!rev) { 1269 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 1270 return -ENOMEM; 1271 } 1272 1273 /* Set transport revision */ 1274 ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV; 1275 ccw->flags = 0; 1276 ccw->count = sizeof(*rev); 1277 ccw->cda = (__u32)(unsigned long)rev; 1278 1279 vcdev->revision = VIRTIO_CCW_REV_MAX; 1280 do { 1281 rev->revision = vcdev->revision; 1282 /* none of our supported revisions carry payload */ 1283 rev->length = 0; 1284 ret = ccw_io_helper(vcdev, ccw, 1285 VIRTIO_CCW_DOING_SET_VIRTIO_REV); 1286 if (ret == -EOPNOTSUPP) { 1287 if (vcdev->revision == 0) 1288 /* 1289 * The host device does not support setting 1290 * the revision: let's operate it in legacy 1291 * mode. 1292 */ 1293 ret = 0; 1294 else 1295 vcdev->revision--; 1296 } 1297 } while (ret == -EOPNOTSUPP); 1298 1299 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 1300 ccw_device_dma_free(vcdev->cdev, rev, sizeof(*rev)); 1301 return ret; 1302 } 1303 1304 static int virtio_ccw_online(struct ccw_device *cdev) 1305 { 1306 int ret; 1307 struct virtio_ccw_device *vcdev; 1308 unsigned long flags; 1309 1310 vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL); 1311 if (!vcdev) { 1312 dev_warn(&cdev->dev, "Could not get memory for virtio\n"); 1313 ret = -ENOMEM; 1314 goto out_free; 1315 } 1316 vcdev->vdev.dev.parent = &cdev->dev; 1317 vcdev->cdev = cdev; 1318 vcdev->dma_area = ccw_device_dma_zalloc(vcdev->cdev, 1319 sizeof(*vcdev->dma_area)); 1320 if (!vcdev->dma_area) { 1321 ret = -ENOMEM; 1322 goto out_free; 1323 } 1324 1325 vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */ 1326 1327 vcdev->vdev.dev.release = virtio_ccw_release_dev; 1328 vcdev->vdev.config = &virtio_ccw_config_ops; 1329 init_waitqueue_head(&vcdev->wait_q); 1330 INIT_LIST_HEAD(&vcdev->virtqueues); 1331 spin_lock_init(&vcdev->lock); 1332 rwlock_init(&vcdev->irq_lock); 1333 mutex_init(&vcdev->io_lock); 1334 1335 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1336 dev_set_drvdata(&cdev->dev, vcdev); 1337 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1338 vcdev->vdev.id.vendor = cdev->id.cu_type; 1339 vcdev->vdev.id.device = cdev->id.cu_model; 1340 1341 ret = virtio_ccw_set_transport_rev(vcdev); 1342 if (ret) 1343 goto out_free; 1344 1345 ret = register_virtio_device(&vcdev->vdev); 1346 if (ret) { 1347 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n", 1348 ret); 1349 goto out_put; 1350 } 1351 return 0; 1352 out_put: 1353 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1354 dev_set_drvdata(&cdev->dev, NULL); 1355 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1356 put_device(&vcdev->vdev.dev); 1357 return ret; 1358 out_free: 1359 if (vcdev) { 1360 ccw_device_dma_free(vcdev->cdev, vcdev->dma_area, 1361 sizeof(*vcdev->dma_area)); 1362 } 1363 kfree(vcdev); 1364 return ret; 1365 } 1366 1367 static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event) 1368 { 1369 int rc; 1370 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1371 1372 /* 1373 * Make sure vcdev is set 1374 * i.e. set_offline/remove callback not already running 1375 */ 1376 if (!vcdev) 1377 return NOTIFY_DONE; 1378 1379 switch (event) { 1380 case CIO_GONE: 1381 vcdev->device_lost = true; 1382 rc = NOTIFY_DONE; 1383 break; 1384 case CIO_OPER: 1385 rc = NOTIFY_OK; 1386 break; 1387 default: 1388 rc = NOTIFY_DONE; 1389 break; 1390 } 1391 return rc; 1392 } 1393 1394 static struct ccw_device_id virtio_ids[] = { 1395 { CCW_DEVICE(0x3832, 0) }, 1396 {}, 1397 }; 1398 1399 static struct ccw_driver virtio_ccw_driver = { 1400 .driver = { 1401 .owner = THIS_MODULE, 1402 .name = "virtio_ccw", 1403 }, 1404 .ids = virtio_ids, 1405 .probe = virtio_ccw_probe, 1406 .remove = virtio_ccw_remove, 1407 .set_offline = virtio_ccw_offline, 1408 .set_online = virtio_ccw_online, 1409 .notify = virtio_ccw_cio_notify, 1410 .int_class = IRQIO_VIR, 1411 }; 1412 1413 static int __init pure_hex(char **cp, unsigned int *val, int min_digit, 1414 int max_digit, int max_val) 1415 { 1416 int diff; 1417 1418 diff = 0; 1419 *val = 0; 1420 1421 while (diff <= max_digit) { 1422 int value = hex_to_bin(**cp); 1423 1424 if (value < 0) 1425 break; 1426 *val = *val * 16 + value; 1427 (*cp)++; 1428 diff++; 1429 } 1430 1431 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) 1432 return 1; 1433 1434 return 0; 1435 } 1436 1437 static int __init parse_busid(char *str, unsigned int *cssid, 1438 unsigned int *ssid, unsigned int *devno) 1439 { 1440 char *str_work; 1441 int rc, ret; 1442 1443 rc = 1; 1444 1445 if (*str == '\0') 1446 goto out; 1447 1448 str_work = str; 1449 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); 1450 if (ret || (str_work[0] != '.')) 1451 goto out; 1452 str_work++; 1453 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); 1454 if (ret || (str_work[0] != '.')) 1455 goto out; 1456 str_work++; 1457 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); 1458 if (ret || (str_work[0] != '\0')) 1459 goto out; 1460 1461 rc = 0; 1462 out: 1463 return rc; 1464 } 1465 1466 static void __init no_auto_parse(void) 1467 { 1468 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; 1469 char *parm, *str; 1470 int rc; 1471 1472 str = no_auto; 1473 while ((parm = strsep(&str, ","))) { 1474 rc = parse_busid(strsep(&parm, "-"), &from_cssid, 1475 &from_ssid, &from); 1476 if (rc) 1477 continue; 1478 if (parm != NULL) { 1479 rc = parse_busid(parm, &to_cssid, 1480 &to_ssid, &to); 1481 if ((from_ssid > to_ssid) || 1482 ((from_ssid == to_ssid) && (from > to))) 1483 rc = -EINVAL; 1484 } else { 1485 to_cssid = from_cssid; 1486 to_ssid = from_ssid; 1487 to = from; 1488 } 1489 if (rc) 1490 continue; 1491 while ((from_ssid < to_ssid) || 1492 ((from_ssid == to_ssid) && (from <= to))) { 1493 set_bit(from, devs_no_auto[from_ssid]); 1494 from++; 1495 if (from > __MAX_SUBCHANNEL) { 1496 from_ssid++; 1497 from = 0; 1498 } 1499 } 1500 } 1501 } 1502 1503 static int __init virtio_ccw_init(void) 1504 { 1505 int rc; 1506 1507 /* parse no_auto string before we do anything further */ 1508 no_auto_parse(); 1509 1510 summary_indicators = cio_dma_zalloc(MAX_AIRQ_AREAS); 1511 if (!summary_indicators) 1512 return -ENOMEM; 1513 rc = ccw_driver_register(&virtio_ccw_driver); 1514 if (rc) 1515 cio_dma_free(summary_indicators, MAX_AIRQ_AREAS); 1516 return rc; 1517 } 1518 device_initcall(virtio_ccw_init); 1519