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 /* it may have been reduced */ 536 info->num = virtqueue_get_vring_size(vq); 537 538 /* Register it with the host. */ 539 queue = virtqueue_get_desc_addr(vq); 540 if (vcdev->revision == 0) { 541 info->info_block->l.queue = queue; 542 info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN; 543 info->info_block->l.index = i; 544 info->info_block->l.num = info->num; 545 ccw->count = sizeof(info->info_block->l); 546 } else { 547 info->info_block->s.desc = queue; 548 info->info_block->s.index = i; 549 info->info_block->s.num = info->num; 550 info->info_block->s.avail = (__u64)virtqueue_get_avail_addr(vq); 551 info->info_block->s.used = (__u64)virtqueue_get_used_addr(vq); 552 ccw->count = sizeof(info->info_block->s); 553 } 554 ccw->cmd_code = CCW_CMD_SET_VQ; 555 ccw->flags = 0; 556 ccw->cda = (__u32)(unsigned long)(info->info_block); 557 err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i); 558 if (err) { 559 dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n"); 560 goto out_err; 561 } 562 563 info->vq = vq; 564 vq->priv = info; 565 566 /* Save it to our list. */ 567 spin_lock_irqsave(&vcdev->lock, flags); 568 list_add(&info->node, &vcdev->virtqueues); 569 spin_unlock_irqrestore(&vcdev->lock, flags); 570 571 return vq; 572 573 out_err: 574 if (vq) 575 vring_del_virtqueue(vq); 576 if (info) { 577 ccw_device_dma_free(vcdev->cdev, info->info_block, 578 sizeof(*info->info_block)); 579 } 580 kfree(info); 581 return ERR_PTR(err); 582 } 583 584 static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev, 585 struct virtqueue *vqs[], int nvqs, 586 struct ccw1 *ccw) 587 { 588 int ret; 589 struct virtio_thinint_area *thinint_area = NULL; 590 struct airq_info *info; 591 592 thinint_area = ccw_device_dma_zalloc(vcdev->cdev, 593 sizeof(*thinint_area)); 594 if (!thinint_area) { 595 ret = -ENOMEM; 596 goto out; 597 } 598 /* Try to get an indicator. */ 599 thinint_area->indicator = get_airq_indicator(vqs, nvqs, 600 &thinint_area->bit_nr, 601 &vcdev->airq_info); 602 if (!thinint_area->indicator) { 603 ret = -ENOSPC; 604 goto out; 605 } 606 info = vcdev->airq_info; 607 thinint_area->summary_indicator = 608 (unsigned long) get_summary_indicator(info); 609 thinint_area->isc = VIRTIO_AIRQ_ISC; 610 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; 611 ccw->flags = CCW_FLAG_SLI; 612 ccw->count = sizeof(*thinint_area); 613 ccw->cda = (__u32)(unsigned long)thinint_area; 614 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER); 615 if (ret) { 616 if (ret == -EOPNOTSUPP) { 617 /* 618 * The host does not support adapter interrupts 619 * for virtio-ccw, stop trying. 620 */ 621 virtio_ccw_use_airq = 0; 622 pr_info("Adapter interrupts unsupported on host\n"); 623 } else 624 dev_warn(&vcdev->cdev->dev, 625 "enabling adapter interrupts = %d\n", ret); 626 virtio_ccw_drop_indicators(vcdev); 627 } 628 out: 629 ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area)); 630 return ret; 631 } 632 633 static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, 634 struct virtqueue *vqs[], 635 vq_callback_t *callbacks[], 636 const char * const names[], 637 const bool *ctx, 638 struct irq_affinity *desc) 639 { 640 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 641 unsigned long *indicatorp = NULL; 642 int ret, i, queue_idx = 0; 643 struct ccw1 *ccw; 644 645 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 646 if (!ccw) 647 return -ENOMEM; 648 649 for (i = 0; i < nvqs; ++i) { 650 if (!names[i]) { 651 vqs[i] = NULL; 652 continue; 653 } 654 655 vqs[i] = virtio_ccw_setup_vq(vdev, queue_idx++, callbacks[i], 656 names[i], ctx ? ctx[i] : false, 657 ccw); 658 if (IS_ERR(vqs[i])) { 659 ret = PTR_ERR(vqs[i]); 660 vqs[i] = NULL; 661 goto out; 662 } 663 } 664 ret = -ENOMEM; 665 /* 666 * We need a data area under 2G to communicate. Our payload is 667 * the address of the indicators. 668 */ 669 indicatorp = ccw_device_dma_zalloc(vcdev->cdev, 670 sizeof(indicators(vcdev))); 671 if (!indicatorp) 672 goto out; 673 *indicatorp = (unsigned long) indicators(vcdev); 674 if (vcdev->is_thinint) { 675 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw); 676 if (ret) 677 /* no error, just fall back to legacy interrupts */ 678 vcdev->is_thinint = false; 679 } 680 if (!vcdev->is_thinint) { 681 /* Register queue indicators with host. */ 682 *indicators(vcdev) = 0; 683 ccw->cmd_code = CCW_CMD_SET_IND; 684 ccw->flags = 0; 685 ccw->count = sizeof(indicators(vcdev)); 686 ccw->cda = (__u32)(unsigned long) indicatorp; 687 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND); 688 if (ret) 689 goto out; 690 } 691 /* Register indicators2 with host for config changes */ 692 *indicatorp = (unsigned long) indicators2(vcdev); 693 *indicators2(vcdev) = 0; 694 ccw->cmd_code = CCW_CMD_SET_CONF_IND; 695 ccw->flags = 0; 696 ccw->count = sizeof(indicators2(vcdev)); 697 ccw->cda = (__u32)(unsigned long) indicatorp; 698 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND); 699 if (ret) 700 goto out; 701 702 if (indicatorp) 703 ccw_device_dma_free(vcdev->cdev, indicatorp, 704 sizeof(indicators(vcdev))); 705 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 706 return 0; 707 out: 708 if (indicatorp) 709 ccw_device_dma_free(vcdev->cdev, indicatorp, 710 sizeof(indicators(vcdev))); 711 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 712 virtio_ccw_del_vqs(vdev); 713 return ret; 714 } 715 716 static void virtio_ccw_reset(struct virtio_device *vdev) 717 { 718 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 719 struct ccw1 *ccw; 720 721 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 722 if (!ccw) 723 return; 724 725 /* Zero status bits. */ 726 vcdev->dma_area->status = 0; 727 728 /* Send a reset ccw on device. */ 729 ccw->cmd_code = CCW_CMD_VDEV_RESET; 730 ccw->flags = 0; 731 ccw->count = 0; 732 ccw->cda = 0; 733 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET); 734 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 735 } 736 737 static u64 virtio_ccw_get_features(struct virtio_device *vdev) 738 { 739 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 740 struct virtio_feature_desc *features; 741 int ret; 742 u64 rc; 743 struct ccw1 *ccw; 744 745 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 746 if (!ccw) 747 return 0; 748 749 features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features)); 750 if (!features) { 751 rc = 0; 752 goto out_free; 753 } 754 /* Read the feature bits from the host. */ 755 features->index = 0; 756 ccw->cmd_code = CCW_CMD_READ_FEAT; 757 ccw->flags = 0; 758 ccw->count = sizeof(*features); 759 ccw->cda = (__u32)(unsigned long)features; 760 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 761 if (ret) { 762 rc = 0; 763 goto out_free; 764 } 765 766 rc = le32_to_cpu(features->features); 767 768 if (vcdev->revision == 0) 769 goto out_free; 770 771 /* Read second half of the feature bits from the host. */ 772 features->index = 1; 773 ccw->cmd_code = CCW_CMD_READ_FEAT; 774 ccw->flags = 0; 775 ccw->count = sizeof(*features); 776 ccw->cda = (__u32)(unsigned long)features; 777 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 778 if (ret == 0) 779 rc |= (u64)le32_to_cpu(features->features) << 32; 780 781 out_free: 782 ccw_device_dma_free(vcdev->cdev, features, sizeof(*features)); 783 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 784 return rc; 785 } 786 787 static void ccw_transport_features(struct virtio_device *vdev) 788 { 789 /* 790 * Currently nothing to do here. 791 */ 792 } 793 794 static int virtio_ccw_finalize_features(struct virtio_device *vdev) 795 { 796 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 797 struct virtio_feature_desc *features; 798 struct ccw1 *ccw; 799 int ret; 800 801 if (vcdev->revision >= 1 && 802 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { 803 dev_err(&vdev->dev, "virtio: device uses revision 1 " 804 "but does not have VIRTIO_F_VERSION_1\n"); 805 return -EINVAL; 806 } 807 808 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 809 if (!ccw) 810 return -ENOMEM; 811 812 features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features)); 813 if (!features) { 814 ret = -ENOMEM; 815 goto out_free; 816 } 817 /* Give virtio_ring a chance to accept features. */ 818 vring_transport_features(vdev); 819 820 /* Give virtio_ccw a chance to accept features. */ 821 ccw_transport_features(vdev); 822 823 features->index = 0; 824 features->features = cpu_to_le32((u32)vdev->features); 825 /* Write the first half of the feature bits to the host. */ 826 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 827 ccw->flags = 0; 828 ccw->count = sizeof(*features); 829 ccw->cda = (__u32)(unsigned long)features; 830 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 831 if (ret) 832 goto out_free; 833 834 if (vcdev->revision == 0) 835 goto out_free; 836 837 features->index = 1; 838 features->features = cpu_to_le32(vdev->features >> 32); 839 /* Write the second half of the feature bits to the host. */ 840 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 841 ccw->flags = 0; 842 ccw->count = sizeof(*features); 843 ccw->cda = (__u32)(unsigned long)features; 844 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 845 846 out_free: 847 ccw_device_dma_free(vcdev->cdev, features, sizeof(*features)); 848 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 849 850 return ret; 851 } 852 853 static void virtio_ccw_get_config(struct virtio_device *vdev, 854 unsigned int offset, void *buf, unsigned len) 855 { 856 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 857 int ret; 858 struct ccw1 *ccw; 859 void *config_area; 860 unsigned long flags; 861 862 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 863 if (!ccw) 864 return; 865 866 config_area = ccw_device_dma_zalloc(vcdev->cdev, 867 VIRTIO_CCW_CONFIG_SIZE); 868 if (!config_area) 869 goto out_free; 870 871 /* Read the config area from the host. */ 872 ccw->cmd_code = CCW_CMD_READ_CONF; 873 ccw->flags = 0; 874 ccw->count = offset + len; 875 ccw->cda = (__u32)(unsigned long)config_area; 876 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG); 877 if (ret) 878 goto out_free; 879 880 spin_lock_irqsave(&vcdev->lock, flags); 881 memcpy(vcdev->config, config_area, offset + len); 882 if (vcdev->config_ready < offset + len) 883 vcdev->config_ready = offset + len; 884 spin_unlock_irqrestore(&vcdev->lock, flags); 885 if (buf) 886 memcpy(buf, config_area + offset, len); 887 888 out_free: 889 ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE); 890 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 891 } 892 893 static void virtio_ccw_set_config(struct virtio_device *vdev, 894 unsigned int offset, const void *buf, 895 unsigned len) 896 { 897 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 898 struct ccw1 *ccw; 899 void *config_area; 900 unsigned long flags; 901 902 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 903 if (!ccw) 904 return; 905 906 config_area = ccw_device_dma_zalloc(vcdev->cdev, 907 VIRTIO_CCW_CONFIG_SIZE); 908 if (!config_area) 909 goto out_free; 910 911 /* Make sure we don't overwrite fields. */ 912 if (vcdev->config_ready < offset) 913 virtio_ccw_get_config(vdev, 0, NULL, offset); 914 spin_lock_irqsave(&vcdev->lock, flags); 915 memcpy(&vcdev->config[offset], buf, len); 916 /* Write the config area to the host. */ 917 memcpy(config_area, vcdev->config, sizeof(vcdev->config)); 918 spin_unlock_irqrestore(&vcdev->lock, flags); 919 ccw->cmd_code = CCW_CMD_WRITE_CONF; 920 ccw->flags = 0; 921 ccw->count = offset + len; 922 ccw->cda = (__u32)(unsigned long)config_area; 923 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG); 924 925 out_free: 926 ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE); 927 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 928 } 929 930 static u8 virtio_ccw_get_status(struct virtio_device *vdev) 931 { 932 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 933 u8 old_status = vcdev->dma_area->status; 934 struct ccw1 *ccw; 935 936 if (vcdev->revision < 2) 937 return vcdev->dma_area->status; 938 939 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 940 if (!ccw) 941 return old_status; 942 943 ccw->cmd_code = CCW_CMD_READ_STATUS; 944 ccw->flags = 0; 945 ccw->count = sizeof(vcdev->dma_area->status); 946 ccw->cda = (__u32)(unsigned long)&vcdev->dma_area->status; 947 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS); 948 /* 949 * If the channel program failed (should only happen if the device 950 * was hotunplugged, and then we clean up via the machine check 951 * handler anyway), vcdev->dma_area->status was not overwritten and we just 952 * return the old status, which is fine. 953 */ 954 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 955 956 return vcdev->dma_area->status; 957 } 958 959 static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status) 960 { 961 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 962 u8 old_status = vcdev->dma_area->status; 963 struct ccw1 *ccw; 964 int ret; 965 966 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 967 if (!ccw) 968 return; 969 970 /* Write the status to the host. */ 971 vcdev->dma_area->status = status; 972 ccw->cmd_code = CCW_CMD_WRITE_STATUS; 973 ccw->flags = 0; 974 ccw->count = sizeof(status); 975 ccw->cda = (__u32)(unsigned long)&vcdev->dma_area->status; 976 /* We use ssch for setting the status which is a serializing 977 * instruction that guarantees the memory writes have 978 * completed before ssch. 979 */ 980 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS); 981 /* Write failed? We assume status is unchanged. */ 982 if (ret) 983 vcdev->dma_area->status = old_status; 984 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 985 } 986 987 static const char *virtio_ccw_bus_name(struct virtio_device *vdev) 988 { 989 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 990 991 return dev_name(&vcdev->cdev->dev); 992 } 993 994 static void virtio_ccw_synchronize_cbs(struct virtio_device *vdev) 995 { 996 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 997 struct airq_info *info = vcdev->airq_info; 998 999 if (info) { 1000 /* 1001 * This device uses adapter interrupts: synchronize with 1002 * vring_interrupt() called by virtio_airq_handler() 1003 * via the indicator area lock. 1004 */ 1005 write_lock_irq(&info->lock); 1006 write_unlock_irq(&info->lock); 1007 } else { 1008 /* This device uses classic interrupts: synchronize 1009 * with vring_interrupt() called by 1010 * virtio_ccw_int_handler() via the per-device 1011 * irq_lock 1012 */ 1013 write_lock_irq(&vcdev->irq_lock); 1014 write_unlock_irq(&vcdev->irq_lock); 1015 } 1016 } 1017 1018 static const struct virtio_config_ops virtio_ccw_config_ops = { 1019 .get_features = virtio_ccw_get_features, 1020 .finalize_features = virtio_ccw_finalize_features, 1021 .get = virtio_ccw_get_config, 1022 .set = virtio_ccw_set_config, 1023 .get_status = virtio_ccw_get_status, 1024 .set_status = virtio_ccw_set_status, 1025 .reset = virtio_ccw_reset, 1026 .find_vqs = virtio_ccw_find_vqs, 1027 .del_vqs = virtio_ccw_del_vqs, 1028 .bus_name = virtio_ccw_bus_name, 1029 .synchronize_cbs = virtio_ccw_synchronize_cbs, 1030 }; 1031 1032 1033 /* 1034 * ccw bus driver related functions 1035 */ 1036 1037 static void virtio_ccw_release_dev(struct device *_d) 1038 { 1039 struct virtio_device *dev = dev_to_virtio(_d); 1040 struct virtio_ccw_device *vcdev = to_vc_device(dev); 1041 1042 ccw_device_dma_free(vcdev->cdev, vcdev->dma_area, 1043 sizeof(*vcdev->dma_area)); 1044 kfree(vcdev); 1045 } 1046 1047 static int irb_is_error(struct irb *irb) 1048 { 1049 if (scsw_cstat(&irb->scsw) != 0) 1050 return 1; 1051 if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) 1052 return 1; 1053 if (scsw_cc(&irb->scsw) != 0) 1054 return 1; 1055 return 0; 1056 } 1057 1058 static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev, 1059 int index) 1060 { 1061 struct virtio_ccw_vq_info *info; 1062 unsigned long flags; 1063 struct virtqueue *vq; 1064 1065 vq = NULL; 1066 spin_lock_irqsave(&vcdev->lock, flags); 1067 list_for_each_entry(info, &vcdev->virtqueues, node) { 1068 if (info->vq->index == index) { 1069 vq = info->vq; 1070 break; 1071 } 1072 } 1073 spin_unlock_irqrestore(&vcdev->lock, flags); 1074 return vq; 1075 } 1076 1077 static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev, 1078 __u32 activity) 1079 { 1080 if (vcdev->curr_io & activity) { 1081 switch (activity) { 1082 case VIRTIO_CCW_DOING_READ_FEAT: 1083 case VIRTIO_CCW_DOING_WRITE_FEAT: 1084 case VIRTIO_CCW_DOING_READ_CONFIG: 1085 case VIRTIO_CCW_DOING_WRITE_CONFIG: 1086 case VIRTIO_CCW_DOING_WRITE_STATUS: 1087 case VIRTIO_CCW_DOING_READ_STATUS: 1088 case VIRTIO_CCW_DOING_SET_VQ: 1089 case VIRTIO_CCW_DOING_SET_IND: 1090 case VIRTIO_CCW_DOING_SET_CONF_IND: 1091 case VIRTIO_CCW_DOING_RESET: 1092 case VIRTIO_CCW_DOING_READ_VQ_CONF: 1093 case VIRTIO_CCW_DOING_SET_IND_ADAPTER: 1094 case VIRTIO_CCW_DOING_SET_VIRTIO_REV: 1095 vcdev->curr_io &= ~activity; 1096 wake_up(&vcdev->wait_q); 1097 break; 1098 default: 1099 /* don't know what to do... */ 1100 dev_warn(&vcdev->cdev->dev, 1101 "Suspicious activity '%08x'\n", activity); 1102 WARN_ON(1); 1103 break; 1104 } 1105 } 1106 } 1107 1108 static void virtio_ccw_int_handler(struct ccw_device *cdev, 1109 unsigned long intparm, 1110 struct irb *irb) 1111 { 1112 __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK; 1113 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1114 int i; 1115 struct virtqueue *vq; 1116 1117 if (!vcdev) 1118 return; 1119 if (IS_ERR(irb)) { 1120 vcdev->err = PTR_ERR(irb); 1121 virtio_ccw_check_activity(vcdev, activity); 1122 /* Don't poke around indicators, something's wrong. */ 1123 return; 1124 } 1125 /* Check if it's a notification from the host. */ 1126 if ((intparm == 0) && 1127 (scsw_stctl(&irb->scsw) == 1128 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) { 1129 /* OK */ 1130 } 1131 if (irb_is_error(irb)) { 1132 /* Command reject? */ 1133 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) && 1134 (irb->ecw[0] & SNS0_CMD_REJECT)) 1135 vcdev->err = -EOPNOTSUPP; 1136 else 1137 /* Map everything else to -EIO. */ 1138 vcdev->err = -EIO; 1139 } 1140 virtio_ccw_check_activity(vcdev, activity); 1141 #ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION 1142 /* 1143 * Paired with virtio_ccw_synchronize_cbs() and interrupts are 1144 * disabled here. 1145 */ 1146 read_lock(&vcdev->irq_lock); 1147 #endif 1148 for_each_set_bit(i, indicators(vcdev), 1149 sizeof(*indicators(vcdev)) * BITS_PER_BYTE) { 1150 /* The bit clear must happen before the vring kick. */ 1151 clear_bit(i, indicators(vcdev)); 1152 barrier(); 1153 vq = virtio_ccw_vq_by_ind(vcdev, i); 1154 vring_interrupt(0, vq); 1155 } 1156 #ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION 1157 read_unlock(&vcdev->irq_lock); 1158 #endif 1159 if (test_bit(0, indicators2(vcdev))) { 1160 virtio_config_changed(&vcdev->vdev); 1161 clear_bit(0, indicators2(vcdev)); 1162 } 1163 } 1164 1165 /* 1166 * We usually want to autoonline all devices, but give the admin 1167 * a way to exempt devices from this. 1168 */ 1169 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ 1170 (8*sizeof(long))) 1171 static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS]; 1172 1173 static char *no_auto = ""; 1174 1175 module_param(no_auto, charp, 0444); 1176 MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined"); 1177 1178 static int virtio_ccw_check_autoonline(struct ccw_device *cdev) 1179 { 1180 struct ccw_dev_id id; 1181 1182 ccw_device_get_id(cdev, &id); 1183 if (test_bit(id.devno, devs_no_auto[id.ssid])) 1184 return 0; 1185 return 1; 1186 } 1187 1188 static void virtio_ccw_auto_online(void *data, async_cookie_t cookie) 1189 { 1190 struct ccw_device *cdev = data; 1191 int ret; 1192 1193 ret = ccw_device_set_online(cdev); 1194 if (ret) 1195 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret); 1196 } 1197 1198 static int virtio_ccw_probe(struct ccw_device *cdev) 1199 { 1200 cdev->handler = virtio_ccw_int_handler; 1201 1202 if (virtio_ccw_check_autoonline(cdev)) 1203 async_schedule(virtio_ccw_auto_online, cdev); 1204 return 0; 1205 } 1206 1207 static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev) 1208 { 1209 unsigned long flags; 1210 struct virtio_ccw_device *vcdev; 1211 1212 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1213 vcdev = dev_get_drvdata(&cdev->dev); 1214 if (!vcdev || vcdev->going_away) { 1215 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1216 return NULL; 1217 } 1218 vcdev->going_away = true; 1219 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1220 return vcdev; 1221 } 1222 1223 static void virtio_ccw_remove(struct ccw_device *cdev) 1224 { 1225 unsigned long flags; 1226 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1227 1228 if (vcdev && cdev->online) { 1229 if (vcdev->device_lost) 1230 virtio_break_device(&vcdev->vdev); 1231 unregister_virtio_device(&vcdev->vdev); 1232 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1233 dev_set_drvdata(&cdev->dev, NULL); 1234 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1235 } 1236 cdev->handler = NULL; 1237 } 1238 1239 static int virtio_ccw_offline(struct ccw_device *cdev) 1240 { 1241 unsigned long flags; 1242 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1243 1244 if (!vcdev) 1245 return 0; 1246 if (vcdev->device_lost) 1247 virtio_break_device(&vcdev->vdev); 1248 unregister_virtio_device(&vcdev->vdev); 1249 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1250 dev_set_drvdata(&cdev->dev, NULL); 1251 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1252 return 0; 1253 } 1254 1255 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev) 1256 { 1257 struct virtio_rev_info *rev; 1258 struct ccw1 *ccw; 1259 int ret; 1260 1261 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 1262 if (!ccw) 1263 return -ENOMEM; 1264 rev = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*rev)); 1265 if (!rev) { 1266 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 1267 return -ENOMEM; 1268 } 1269 1270 /* Set transport revision */ 1271 ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV; 1272 ccw->flags = 0; 1273 ccw->count = sizeof(*rev); 1274 ccw->cda = (__u32)(unsigned long)rev; 1275 1276 vcdev->revision = VIRTIO_CCW_REV_MAX; 1277 do { 1278 rev->revision = vcdev->revision; 1279 /* none of our supported revisions carry payload */ 1280 rev->length = 0; 1281 ret = ccw_io_helper(vcdev, ccw, 1282 VIRTIO_CCW_DOING_SET_VIRTIO_REV); 1283 if (ret == -EOPNOTSUPP) { 1284 if (vcdev->revision == 0) 1285 /* 1286 * The host device does not support setting 1287 * the revision: let's operate it in legacy 1288 * mode. 1289 */ 1290 ret = 0; 1291 else 1292 vcdev->revision--; 1293 } 1294 } while (ret == -EOPNOTSUPP); 1295 1296 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 1297 ccw_device_dma_free(vcdev->cdev, rev, sizeof(*rev)); 1298 return ret; 1299 } 1300 1301 static int virtio_ccw_online(struct ccw_device *cdev) 1302 { 1303 int ret; 1304 struct virtio_ccw_device *vcdev; 1305 unsigned long flags; 1306 1307 vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL); 1308 if (!vcdev) { 1309 dev_warn(&cdev->dev, "Could not get memory for virtio\n"); 1310 ret = -ENOMEM; 1311 goto out_free; 1312 } 1313 vcdev->vdev.dev.parent = &cdev->dev; 1314 vcdev->cdev = cdev; 1315 vcdev->dma_area = ccw_device_dma_zalloc(vcdev->cdev, 1316 sizeof(*vcdev->dma_area)); 1317 if (!vcdev->dma_area) { 1318 ret = -ENOMEM; 1319 goto out_free; 1320 } 1321 1322 vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */ 1323 1324 vcdev->vdev.dev.release = virtio_ccw_release_dev; 1325 vcdev->vdev.config = &virtio_ccw_config_ops; 1326 init_waitqueue_head(&vcdev->wait_q); 1327 INIT_LIST_HEAD(&vcdev->virtqueues); 1328 spin_lock_init(&vcdev->lock); 1329 rwlock_init(&vcdev->irq_lock); 1330 mutex_init(&vcdev->io_lock); 1331 1332 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1333 dev_set_drvdata(&cdev->dev, vcdev); 1334 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1335 vcdev->vdev.id.vendor = cdev->id.cu_type; 1336 vcdev->vdev.id.device = cdev->id.cu_model; 1337 1338 ret = virtio_ccw_set_transport_rev(vcdev); 1339 if (ret) 1340 goto out_free; 1341 1342 ret = register_virtio_device(&vcdev->vdev); 1343 if (ret) { 1344 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n", 1345 ret); 1346 goto out_put; 1347 } 1348 return 0; 1349 out_put: 1350 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1351 dev_set_drvdata(&cdev->dev, NULL); 1352 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1353 put_device(&vcdev->vdev.dev); 1354 return ret; 1355 out_free: 1356 if (vcdev) { 1357 ccw_device_dma_free(vcdev->cdev, vcdev->dma_area, 1358 sizeof(*vcdev->dma_area)); 1359 } 1360 kfree(vcdev); 1361 return ret; 1362 } 1363 1364 static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event) 1365 { 1366 int rc; 1367 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1368 1369 /* 1370 * Make sure vcdev is set 1371 * i.e. set_offline/remove callback not already running 1372 */ 1373 if (!vcdev) 1374 return NOTIFY_DONE; 1375 1376 switch (event) { 1377 case CIO_GONE: 1378 vcdev->device_lost = true; 1379 rc = NOTIFY_DONE; 1380 break; 1381 case CIO_OPER: 1382 rc = NOTIFY_OK; 1383 break; 1384 default: 1385 rc = NOTIFY_DONE; 1386 break; 1387 } 1388 return rc; 1389 } 1390 1391 static struct ccw_device_id virtio_ids[] = { 1392 { CCW_DEVICE(0x3832, 0) }, 1393 {}, 1394 }; 1395 1396 static struct ccw_driver virtio_ccw_driver = { 1397 .driver = { 1398 .owner = THIS_MODULE, 1399 .name = "virtio_ccw", 1400 }, 1401 .ids = virtio_ids, 1402 .probe = virtio_ccw_probe, 1403 .remove = virtio_ccw_remove, 1404 .set_offline = virtio_ccw_offline, 1405 .set_online = virtio_ccw_online, 1406 .notify = virtio_ccw_cio_notify, 1407 .int_class = IRQIO_VIR, 1408 }; 1409 1410 static int __init pure_hex(char **cp, unsigned int *val, int min_digit, 1411 int max_digit, int max_val) 1412 { 1413 int diff; 1414 1415 diff = 0; 1416 *val = 0; 1417 1418 while (diff <= max_digit) { 1419 int value = hex_to_bin(**cp); 1420 1421 if (value < 0) 1422 break; 1423 *val = *val * 16 + value; 1424 (*cp)++; 1425 diff++; 1426 } 1427 1428 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) 1429 return 1; 1430 1431 return 0; 1432 } 1433 1434 static int __init parse_busid(char *str, unsigned int *cssid, 1435 unsigned int *ssid, unsigned int *devno) 1436 { 1437 char *str_work; 1438 int rc, ret; 1439 1440 rc = 1; 1441 1442 if (*str == '\0') 1443 goto out; 1444 1445 str_work = str; 1446 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); 1447 if (ret || (str_work[0] != '.')) 1448 goto out; 1449 str_work++; 1450 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); 1451 if (ret || (str_work[0] != '.')) 1452 goto out; 1453 str_work++; 1454 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); 1455 if (ret || (str_work[0] != '\0')) 1456 goto out; 1457 1458 rc = 0; 1459 out: 1460 return rc; 1461 } 1462 1463 static void __init no_auto_parse(void) 1464 { 1465 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; 1466 char *parm, *str; 1467 int rc; 1468 1469 str = no_auto; 1470 while ((parm = strsep(&str, ","))) { 1471 rc = parse_busid(strsep(&parm, "-"), &from_cssid, 1472 &from_ssid, &from); 1473 if (rc) 1474 continue; 1475 if (parm != NULL) { 1476 rc = parse_busid(parm, &to_cssid, 1477 &to_ssid, &to); 1478 if ((from_ssid > to_ssid) || 1479 ((from_ssid == to_ssid) && (from > to))) 1480 rc = -EINVAL; 1481 } else { 1482 to_cssid = from_cssid; 1483 to_ssid = from_ssid; 1484 to = from; 1485 } 1486 if (rc) 1487 continue; 1488 while ((from_ssid < to_ssid) || 1489 ((from_ssid == to_ssid) && (from <= to))) { 1490 set_bit(from, devs_no_auto[from_ssid]); 1491 from++; 1492 if (from > __MAX_SUBCHANNEL) { 1493 from_ssid++; 1494 from = 0; 1495 } 1496 } 1497 } 1498 } 1499 1500 static int __init virtio_ccw_init(void) 1501 { 1502 int rc; 1503 1504 /* parse no_auto string before we do anything further */ 1505 no_auto_parse(); 1506 1507 summary_indicators = cio_dma_zalloc(MAX_AIRQ_AREAS); 1508 if (!summary_indicators) 1509 return -ENOMEM; 1510 rc = ccw_driver_register(&virtio_ccw_driver); 1511 if (rc) 1512 cio_dma_free(summary_indicators, MAX_AIRQ_AREAS); 1513 return rc; 1514 } 1515 device_initcall(virtio_ccw_init); 1516