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)virt_to_phys(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)virt_to_phys(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 inline bool virtio_ccw_do_kvm_notify(struct virtqueue *vq, u32 data) 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 data, info->cookie); 406 if (info->cookie < 0) 407 return false; 408 return true; 409 } 410 411 static bool virtio_ccw_kvm_notify(struct virtqueue *vq) 412 { 413 return virtio_ccw_do_kvm_notify(vq, vq->index); 414 } 415 416 static bool virtio_ccw_kvm_notify_with_data(struct virtqueue *vq) 417 { 418 return virtio_ccw_do_kvm_notify(vq, vring_notification_data(vq)); 419 } 420 421 static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev, 422 struct ccw1 *ccw, int index) 423 { 424 int ret; 425 426 vcdev->dma_area->config_block.index = index; 427 ccw->cmd_code = CCW_CMD_READ_VQ_CONF; 428 ccw->flags = 0; 429 ccw->count = sizeof(struct vq_config_block); 430 ccw->cda = (__u32)virt_to_phys(&vcdev->dma_area->config_block); 431 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF); 432 if (ret) 433 return ret; 434 return vcdev->dma_area->config_block.num ?: -ENOENT; 435 } 436 437 static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw) 438 { 439 struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev); 440 struct virtio_ccw_vq_info *info = vq->priv; 441 unsigned long flags; 442 int ret; 443 unsigned int index = vq->index; 444 445 /* Remove from our list. */ 446 spin_lock_irqsave(&vcdev->lock, flags); 447 list_del(&info->node); 448 spin_unlock_irqrestore(&vcdev->lock, flags); 449 450 /* Release from host. */ 451 if (vcdev->revision == 0) { 452 info->info_block->l.queue = 0; 453 info->info_block->l.align = 0; 454 info->info_block->l.index = index; 455 info->info_block->l.num = 0; 456 ccw->count = sizeof(info->info_block->l); 457 } else { 458 info->info_block->s.desc = 0; 459 info->info_block->s.index = index; 460 info->info_block->s.num = 0; 461 info->info_block->s.avail = 0; 462 info->info_block->s.used = 0; 463 ccw->count = sizeof(info->info_block->s); 464 } 465 ccw->cmd_code = CCW_CMD_SET_VQ; 466 ccw->flags = 0; 467 ccw->cda = (__u32)virt_to_phys(info->info_block); 468 ret = ccw_io_helper(vcdev, ccw, 469 VIRTIO_CCW_DOING_SET_VQ | index); 470 /* 471 * -ENODEV isn't considered an error: The device is gone anyway. 472 * This may happen on device detach. 473 */ 474 if (ret && (ret != -ENODEV)) 475 dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d\n", 476 ret, index); 477 478 vring_del_virtqueue(vq); 479 ccw_device_dma_free(vcdev->cdev, info->info_block, 480 sizeof(*info->info_block)); 481 kfree(info); 482 } 483 484 static void virtio_ccw_del_vqs(struct virtio_device *vdev) 485 { 486 struct virtqueue *vq, *n; 487 struct ccw1 *ccw; 488 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 489 490 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 491 if (!ccw) 492 return; 493 494 virtio_ccw_drop_indicator(vcdev, ccw); 495 496 list_for_each_entry_safe(vq, n, &vdev->vqs, list) 497 virtio_ccw_del_vq(vq, ccw); 498 499 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 500 } 501 502 static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev, 503 int i, vq_callback_t *callback, 504 const char *name, bool ctx, 505 struct ccw1 *ccw) 506 { 507 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 508 bool (*notify)(struct virtqueue *vq); 509 int err; 510 struct virtqueue *vq = NULL; 511 struct virtio_ccw_vq_info *info; 512 u64 queue; 513 unsigned long flags; 514 bool may_reduce; 515 516 if (__virtio_test_bit(vdev, VIRTIO_F_NOTIFICATION_DATA)) 517 notify = virtio_ccw_kvm_notify_with_data; 518 else 519 notify = virtio_ccw_kvm_notify; 520 521 /* Allocate queue. */ 522 info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL); 523 if (!info) { 524 dev_warn(&vcdev->cdev->dev, "no info\n"); 525 err = -ENOMEM; 526 goto out_err; 527 } 528 info->info_block = ccw_device_dma_zalloc(vcdev->cdev, 529 sizeof(*info->info_block)); 530 if (!info->info_block) { 531 dev_warn(&vcdev->cdev->dev, "no info block\n"); 532 err = -ENOMEM; 533 goto out_err; 534 } 535 info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i); 536 if (info->num < 0) { 537 err = info->num; 538 goto out_err; 539 } 540 may_reduce = vcdev->revision > 0; 541 vq = vring_create_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, 542 vdev, true, may_reduce, ctx, 543 notify, callback, name); 544 545 if (!vq) { 546 /* For now, we fail if we can't get the requested size. */ 547 dev_warn(&vcdev->cdev->dev, "no vq\n"); 548 err = -ENOMEM; 549 goto out_err; 550 } 551 552 vq->num_max = info->num; 553 554 /* it may have been reduced */ 555 info->num = virtqueue_get_vring_size(vq); 556 557 /* Register it with the host. */ 558 queue = virtqueue_get_desc_addr(vq); 559 if (vcdev->revision == 0) { 560 info->info_block->l.queue = queue; 561 info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN; 562 info->info_block->l.index = i; 563 info->info_block->l.num = info->num; 564 ccw->count = sizeof(info->info_block->l); 565 } else { 566 info->info_block->s.desc = queue; 567 info->info_block->s.index = i; 568 info->info_block->s.num = info->num; 569 info->info_block->s.avail = (__u64)virtqueue_get_avail_addr(vq); 570 info->info_block->s.used = (__u64)virtqueue_get_used_addr(vq); 571 ccw->count = sizeof(info->info_block->s); 572 } 573 ccw->cmd_code = CCW_CMD_SET_VQ; 574 ccw->flags = 0; 575 ccw->cda = (__u32)virt_to_phys(info->info_block); 576 err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i); 577 if (err) { 578 dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n"); 579 goto out_err; 580 } 581 582 info->vq = vq; 583 vq->priv = info; 584 585 /* Save it to our list. */ 586 spin_lock_irqsave(&vcdev->lock, flags); 587 list_add(&info->node, &vcdev->virtqueues); 588 spin_unlock_irqrestore(&vcdev->lock, flags); 589 590 return vq; 591 592 out_err: 593 if (vq) 594 vring_del_virtqueue(vq); 595 if (info) { 596 ccw_device_dma_free(vcdev->cdev, info->info_block, 597 sizeof(*info->info_block)); 598 } 599 kfree(info); 600 return ERR_PTR(err); 601 } 602 603 static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev, 604 struct virtqueue *vqs[], int nvqs, 605 struct ccw1 *ccw) 606 { 607 int ret; 608 struct virtio_thinint_area *thinint_area = NULL; 609 unsigned long indicator_addr; 610 struct airq_info *info; 611 612 thinint_area = ccw_device_dma_zalloc(vcdev->cdev, 613 sizeof(*thinint_area)); 614 if (!thinint_area) { 615 ret = -ENOMEM; 616 goto out; 617 } 618 /* Try to get an indicator. */ 619 indicator_addr = get_airq_indicator(vqs, nvqs, 620 &thinint_area->bit_nr, 621 &vcdev->airq_info); 622 if (!indicator_addr) { 623 ret = -ENOSPC; 624 goto out; 625 } 626 thinint_area->indicator = virt_to_phys((void *)indicator_addr); 627 info = vcdev->airq_info; 628 thinint_area->summary_indicator = 629 virt_to_phys(get_summary_indicator(info)); 630 thinint_area->isc = VIRTIO_AIRQ_ISC; 631 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; 632 ccw->flags = CCW_FLAG_SLI; 633 ccw->count = sizeof(*thinint_area); 634 ccw->cda = (__u32)virt_to_phys(thinint_area); 635 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER); 636 if (ret) { 637 if (ret == -EOPNOTSUPP) { 638 /* 639 * The host does not support adapter interrupts 640 * for virtio-ccw, stop trying. 641 */ 642 virtio_ccw_use_airq = 0; 643 pr_info("Adapter interrupts unsupported on host\n"); 644 } else 645 dev_warn(&vcdev->cdev->dev, 646 "enabling adapter interrupts = %d\n", ret); 647 virtio_ccw_drop_indicators(vcdev); 648 } 649 out: 650 ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area)); 651 return ret; 652 } 653 654 static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, 655 struct virtqueue *vqs[], 656 vq_callback_t *callbacks[], 657 const char * const names[], 658 const bool *ctx, 659 struct irq_affinity *desc) 660 { 661 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 662 unsigned long *indicatorp = NULL; 663 int ret, i, queue_idx = 0; 664 struct ccw1 *ccw; 665 666 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 667 if (!ccw) 668 return -ENOMEM; 669 670 for (i = 0; i < nvqs; ++i) { 671 if (!names[i]) { 672 vqs[i] = NULL; 673 continue; 674 } 675 676 vqs[i] = virtio_ccw_setup_vq(vdev, queue_idx++, callbacks[i], 677 names[i], ctx ? ctx[i] : false, 678 ccw); 679 if (IS_ERR(vqs[i])) { 680 ret = PTR_ERR(vqs[i]); 681 vqs[i] = NULL; 682 goto out; 683 } 684 } 685 ret = -ENOMEM; 686 /* 687 * We need a data area under 2G to communicate. Our payload is 688 * the address of the indicators. 689 */ 690 indicatorp = ccw_device_dma_zalloc(vcdev->cdev, 691 sizeof(indicators(vcdev))); 692 if (!indicatorp) 693 goto out; 694 *indicatorp = (unsigned long) indicators(vcdev); 695 if (vcdev->is_thinint) { 696 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw); 697 if (ret) 698 /* no error, just fall back to legacy interrupts */ 699 vcdev->is_thinint = false; 700 } 701 if (!vcdev->is_thinint) { 702 /* Register queue indicators with host. */ 703 *indicators(vcdev) = 0; 704 ccw->cmd_code = CCW_CMD_SET_IND; 705 ccw->flags = 0; 706 ccw->count = sizeof(indicators(vcdev)); 707 ccw->cda = (__u32)virt_to_phys(indicatorp); 708 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND); 709 if (ret) 710 goto out; 711 } 712 /* Register indicators2 with host for config changes */ 713 *indicatorp = (unsigned long) indicators2(vcdev); 714 *indicators2(vcdev) = 0; 715 ccw->cmd_code = CCW_CMD_SET_CONF_IND; 716 ccw->flags = 0; 717 ccw->count = sizeof(indicators2(vcdev)); 718 ccw->cda = (__u32)virt_to_phys(indicatorp); 719 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND); 720 if (ret) 721 goto out; 722 723 if (indicatorp) 724 ccw_device_dma_free(vcdev->cdev, indicatorp, 725 sizeof(indicators(vcdev))); 726 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 727 return 0; 728 out: 729 if (indicatorp) 730 ccw_device_dma_free(vcdev->cdev, indicatorp, 731 sizeof(indicators(vcdev))); 732 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 733 virtio_ccw_del_vqs(vdev); 734 return ret; 735 } 736 737 static void virtio_ccw_reset(struct virtio_device *vdev) 738 { 739 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 740 struct ccw1 *ccw; 741 742 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 743 if (!ccw) 744 return; 745 746 /* Zero status bits. */ 747 vcdev->dma_area->status = 0; 748 749 /* Send a reset ccw on device. */ 750 ccw->cmd_code = CCW_CMD_VDEV_RESET; 751 ccw->flags = 0; 752 ccw->count = 0; 753 ccw->cda = 0; 754 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET); 755 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 756 } 757 758 static u64 virtio_ccw_get_features(struct virtio_device *vdev) 759 { 760 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 761 struct virtio_feature_desc *features; 762 int ret; 763 u64 rc; 764 struct ccw1 *ccw; 765 766 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 767 if (!ccw) 768 return 0; 769 770 features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features)); 771 if (!features) { 772 rc = 0; 773 goto out_free; 774 } 775 /* Read the feature bits from the host. */ 776 features->index = 0; 777 ccw->cmd_code = CCW_CMD_READ_FEAT; 778 ccw->flags = 0; 779 ccw->count = sizeof(*features); 780 ccw->cda = (__u32)virt_to_phys(features); 781 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 782 if (ret) { 783 rc = 0; 784 goto out_free; 785 } 786 787 rc = le32_to_cpu(features->features); 788 789 if (vcdev->revision == 0) 790 goto out_free; 791 792 /* Read second half of the feature bits from the host. */ 793 features->index = 1; 794 ccw->cmd_code = CCW_CMD_READ_FEAT; 795 ccw->flags = 0; 796 ccw->count = sizeof(*features); 797 ccw->cda = (__u32)virt_to_phys(features); 798 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 799 if (ret == 0) 800 rc |= (u64)le32_to_cpu(features->features) << 32; 801 802 out_free: 803 ccw_device_dma_free(vcdev->cdev, features, sizeof(*features)); 804 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 805 return rc; 806 } 807 808 static void ccw_transport_features(struct virtio_device *vdev) 809 { 810 /* 811 * Currently nothing to do here. 812 */ 813 } 814 815 static int virtio_ccw_finalize_features(struct virtio_device *vdev) 816 { 817 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 818 struct virtio_feature_desc *features; 819 struct ccw1 *ccw; 820 int ret; 821 822 if (vcdev->revision >= 1 && 823 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { 824 dev_err(&vdev->dev, "virtio: device uses revision 1 " 825 "but does not have VIRTIO_F_VERSION_1\n"); 826 return -EINVAL; 827 } 828 829 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 830 if (!ccw) 831 return -ENOMEM; 832 833 features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features)); 834 if (!features) { 835 ret = -ENOMEM; 836 goto out_free; 837 } 838 /* Give virtio_ring a chance to accept features. */ 839 vring_transport_features(vdev); 840 841 /* Give virtio_ccw a chance to accept features. */ 842 ccw_transport_features(vdev); 843 844 features->index = 0; 845 features->features = cpu_to_le32((u32)vdev->features); 846 /* Write the first half of the feature bits to the host. */ 847 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 848 ccw->flags = 0; 849 ccw->count = sizeof(*features); 850 ccw->cda = (__u32)virt_to_phys(features); 851 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 852 if (ret) 853 goto out_free; 854 855 if (vcdev->revision == 0) 856 goto out_free; 857 858 features->index = 1; 859 features->features = cpu_to_le32(vdev->features >> 32); 860 /* Write the second half of the feature bits to the host. */ 861 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 862 ccw->flags = 0; 863 ccw->count = sizeof(*features); 864 ccw->cda = (__u32)virt_to_phys(features); 865 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 866 867 out_free: 868 ccw_device_dma_free(vcdev->cdev, features, sizeof(*features)); 869 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 870 871 return ret; 872 } 873 874 static void virtio_ccw_get_config(struct virtio_device *vdev, 875 unsigned int offset, void *buf, unsigned len) 876 { 877 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 878 int ret; 879 struct ccw1 *ccw; 880 void *config_area; 881 unsigned long flags; 882 883 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 884 if (!ccw) 885 return; 886 887 config_area = ccw_device_dma_zalloc(vcdev->cdev, 888 VIRTIO_CCW_CONFIG_SIZE); 889 if (!config_area) 890 goto out_free; 891 892 /* Read the config area from the host. */ 893 ccw->cmd_code = CCW_CMD_READ_CONF; 894 ccw->flags = 0; 895 ccw->count = offset + len; 896 ccw->cda = (__u32)virt_to_phys(config_area); 897 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG); 898 if (ret) 899 goto out_free; 900 901 spin_lock_irqsave(&vcdev->lock, flags); 902 memcpy(vcdev->config, config_area, offset + len); 903 if (vcdev->config_ready < offset + len) 904 vcdev->config_ready = offset + len; 905 spin_unlock_irqrestore(&vcdev->lock, flags); 906 if (buf) 907 memcpy(buf, config_area + offset, len); 908 909 out_free: 910 ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE); 911 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 912 } 913 914 static void virtio_ccw_set_config(struct virtio_device *vdev, 915 unsigned int offset, const void *buf, 916 unsigned len) 917 { 918 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 919 struct ccw1 *ccw; 920 void *config_area; 921 unsigned long flags; 922 923 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 924 if (!ccw) 925 return; 926 927 config_area = ccw_device_dma_zalloc(vcdev->cdev, 928 VIRTIO_CCW_CONFIG_SIZE); 929 if (!config_area) 930 goto out_free; 931 932 /* Make sure we don't overwrite fields. */ 933 if (vcdev->config_ready < offset) 934 virtio_ccw_get_config(vdev, 0, NULL, offset); 935 spin_lock_irqsave(&vcdev->lock, flags); 936 memcpy(&vcdev->config[offset], buf, len); 937 /* Write the config area to the host. */ 938 memcpy(config_area, vcdev->config, sizeof(vcdev->config)); 939 spin_unlock_irqrestore(&vcdev->lock, flags); 940 ccw->cmd_code = CCW_CMD_WRITE_CONF; 941 ccw->flags = 0; 942 ccw->count = offset + len; 943 ccw->cda = (__u32)virt_to_phys(config_area); 944 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG); 945 946 out_free: 947 ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE); 948 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 949 } 950 951 static u8 virtio_ccw_get_status(struct virtio_device *vdev) 952 { 953 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 954 u8 old_status = vcdev->dma_area->status; 955 struct ccw1 *ccw; 956 957 if (vcdev->revision < 2) 958 return vcdev->dma_area->status; 959 960 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 961 if (!ccw) 962 return old_status; 963 964 ccw->cmd_code = CCW_CMD_READ_STATUS; 965 ccw->flags = 0; 966 ccw->count = sizeof(vcdev->dma_area->status); 967 ccw->cda = (__u32)virt_to_phys(&vcdev->dma_area->status); 968 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS); 969 /* 970 * If the channel program failed (should only happen if the device 971 * was hotunplugged, and then we clean up via the machine check 972 * handler anyway), vcdev->dma_area->status was not overwritten and we just 973 * return the old status, which is fine. 974 */ 975 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 976 977 return vcdev->dma_area->status; 978 } 979 980 static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status) 981 { 982 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 983 u8 old_status = vcdev->dma_area->status; 984 struct ccw1 *ccw; 985 int ret; 986 987 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 988 if (!ccw) 989 return; 990 991 /* Write the status to the host. */ 992 vcdev->dma_area->status = status; 993 ccw->cmd_code = CCW_CMD_WRITE_STATUS; 994 ccw->flags = 0; 995 ccw->count = sizeof(status); 996 ccw->cda = (__u32)virt_to_phys(&vcdev->dma_area->status); 997 /* We use ssch for setting the status which is a serializing 998 * instruction that guarantees the memory writes have 999 * completed before ssch. 1000 */ 1001 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS); 1002 /* Write failed? We assume status is unchanged. */ 1003 if (ret) 1004 vcdev->dma_area->status = old_status; 1005 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 1006 } 1007 1008 static const char *virtio_ccw_bus_name(struct virtio_device *vdev) 1009 { 1010 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 1011 1012 return dev_name(&vcdev->cdev->dev); 1013 } 1014 1015 static void virtio_ccw_synchronize_cbs(struct virtio_device *vdev) 1016 { 1017 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 1018 struct airq_info *info = vcdev->airq_info; 1019 1020 if (info) { 1021 /* 1022 * This device uses adapter interrupts: synchronize with 1023 * vring_interrupt() called by virtio_airq_handler() 1024 * via the indicator area lock. 1025 */ 1026 write_lock_irq(&info->lock); 1027 write_unlock_irq(&info->lock); 1028 } else { 1029 /* This device uses classic interrupts: synchronize 1030 * with vring_interrupt() called by 1031 * virtio_ccw_int_handler() via the per-device 1032 * irq_lock 1033 */ 1034 write_lock_irq(&vcdev->irq_lock); 1035 write_unlock_irq(&vcdev->irq_lock); 1036 } 1037 } 1038 1039 static const struct virtio_config_ops virtio_ccw_config_ops = { 1040 .get_features = virtio_ccw_get_features, 1041 .finalize_features = virtio_ccw_finalize_features, 1042 .get = virtio_ccw_get_config, 1043 .set = virtio_ccw_set_config, 1044 .get_status = virtio_ccw_get_status, 1045 .set_status = virtio_ccw_set_status, 1046 .reset = virtio_ccw_reset, 1047 .find_vqs = virtio_ccw_find_vqs, 1048 .del_vqs = virtio_ccw_del_vqs, 1049 .bus_name = virtio_ccw_bus_name, 1050 .synchronize_cbs = virtio_ccw_synchronize_cbs, 1051 }; 1052 1053 1054 /* 1055 * ccw bus driver related functions 1056 */ 1057 1058 static void virtio_ccw_release_dev(struct device *_d) 1059 { 1060 struct virtio_device *dev = dev_to_virtio(_d); 1061 struct virtio_ccw_device *vcdev = to_vc_device(dev); 1062 1063 ccw_device_dma_free(vcdev->cdev, vcdev->dma_area, 1064 sizeof(*vcdev->dma_area)); 1065 kfree(vcdev); 1066 } 1067 1068 static int irb_is_error(struct irb *irb) 1069 { 1070 if (scsw_cstat(&irb->scsw) != 0) 1071 return 1; 1072 if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) 1073 return 1; 1074 if (scsw_cc(&irb->scsw) != 0) 1075 return 1; 1076 return 0; 1077 } 1078 1079 static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev, 1080 int index) 1081 { 1082 struct virtio_ccw_vq_info *info; 1083 unsigned long flags; 1084 struct virtqueue *vq; 1085 1086 vq = NULL; 1087 spin_lock_irqsave(&vcdev->lock, flags); 1088 list_for_each_entry(info, &vcdev->virtqueues, node) { 1089 if (info->vq->index == index) { 1090 vq = info->vq; 1091 break; 1092 } 1093 } 1094 spin_unlock_irqrestore(&vcdev->lock, flags); 1095 return vq; 1096 } 1097 1098 static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev, 1099 __u32 activity) 1100 { 1101 if (vcdev->curr_io & activity) { 1102 switch (activity) { 1103 case VIRTIO_CCW_DOING_READ_FEAT: 1104 case VIRTIO_CCW_DOING_WRITE_FEAT: 1105 case VIRTIO_CCW_DOING_READ_CONFIG: 1106 case VIRTIO_CCW_DOING_WRITE_CONFIG: 1107 case VIRTIO_CCW_DOING_WRITE_STATUS: 1108 case VIRTIO_CCW_DOING_READ_STATUS: 1109 case VIRTIO_CCW_DOING_SET_VQ: 1110 case VIRTIO_CCW_DOING_SET_IND: 1111 case VIRTIO_CCW_DOING_SET_CONF_IND: 1112 case VIRTIO_CCW_DOING_RESET: 1113 case VIRTIO_CCW_DOING_READ_VQ_CONF: 1114 case VIRTIO_CCW_DOING_SET_IND_ADAPTER: 1115 case VIRTIO_CCW_DOING_SET_VIRTIO_REV: 1116 vcdev->curr_io &= ~activity; 1117 wake_up(&vcdev->wait_q); 1118 break; 1119 default: 1120 /* don't know what to do... */ 1121 dev_warn(&vcdev->cdev->dev, 1122 "Suspicious activity '%08x'\n", activity); 1123 WARN_ON(1); 1124 break; 1125 } 1126 } 1127 } 1128 1129 static void virtio_ccw_int_handler(struct ccw_device *cdev, 1130 unsigned long intparm, 1131 struct irb *irb) 1132 { 1133 __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK; 1134 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1135 int i; 1136 struct virtqueue *vq; 1137 1138 if (!vcdev) 1139 return; 1140 if (IS_ERR(irb)) { 1141 vcdev->err = PTR_ERR(irb); 1142 virtio_ccw_check_activity(vcdev, activity); 1143 /* Don't poke around indicators, something's wrong. */ 1144 return; 1145 } 1146 /* Check if it's a notification from the host. */ 1147 if ((intparm == 0) && 1148 (scsw_stctl(&irb->scsw) == 1149 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) { 1150 /* OK */ 1151 } 1152 if (irb_is_error(irb)) { 1153 /* Command reject? */ 1154 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) && 1155 (irb->ecw[0] & SNS0_CMD_REJECT)) 1156 vcdev->err = -EOPNOTSUPP; 1157 else 1158 /* Map everything else to -EIO. */ 1159 vcdev->err = -EIO; 1160 } 1161 virtio_ccw_check_activity(vcdev, activity); 1162 #ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION 1163 /* 1164 * Paired with virtio_ccw_synchronize_cbs() and interrupts are 1165 * disabled here. 1166 */ 1167 read_lock(&vcdev->irq_lock); 1168 #endif 1169 for_each_set_bit(i, indicators(vcdev), 1170 sizeof(*indicators(vcdev)) * BITS_PER_BYTE) { 1171 /* The bit clear must happen before the vring kick. */ 1172 clear_bit(i, indicators(vcdev)); 1173 barrier(); 1174 vq = virtio_ccw_vq_by_ind(vcdev, i); 1175 vring_interrupt(0, vq); 1176 } 1177 #ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION 1178 read_unlock(&vcdev->irq_lock); 1179 #endif 1180 if (test_bit(0, indicators2(vcdev))) { 1181 virtio_config_changed(&vcdev->vdev); 1182 clear_bit(0, indicators2(vcdev)); 1183 } 1184 } 1185 1186 /* 1187 * We usually want to autoonline all devices, but give the admin 1188 * a way to exempt devices from this. 1189 */ 1190 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ 1191 (8*sizeof(long))) 1192 static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS]; 1193 1194 static char *no_auto = ""; 1195 1196 module_param(no_auto, charp, 0444); 1197 MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined"); 1198 1199 static int virtio_ccw_check_autoonline(struct ccw_device *cdev) 1200 { 1201 struct ccw_dev_id id; 1202 1203 ccw_device_get_id(cdev, &id); 1204 if (test_bit(id.devno, devs_no_auto[id.ssid])) 1205 return 0; 1206 return 1; 1207 } 1208 1209 static void virtio_ccw_auto_online(void *data, async_cookie_t cookie) 1210 { 1211 struct ccw_device *cdev = data; 1212 int ret; 1213 1214 ret = ccw_device_set_online(cdev); 1215 if (ret) 1216 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret); 1217 } 1218 1219 static int virtio_ccw_probe(struct ccw_device *cdev) 1220 { 1221 cdev->handler = virtio_ccw_int_handler; 1222 1223 if (virtio_ccw_check_autoonline(cdev)) 1224 async_schedule(virtio_ccw_auto_online, cdev); 1225 return 0; 1226 } 1227 1228 static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev) 1229 { 1230 unsigned long flags; 1231 struct virtio_ccw_device *vcdev; 1232 1233 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1234 vcdev = dev_get_drvdata(&cdev->dev); 1235 if (!vcdev || vcdev->going_away) { 1236 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1237 return NULL; 1238 } 1239 vcdev->going_away = true; 1240 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1241 return vcdev; 1242 } 1243 1244 static void virtio_ccw_remove(struct ccw_device *cdev) 1245 { 1246 unsigned long flags; 1247 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1248 1249 if (vcdev && cdev->online) { 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 } 1257 cdev->handler = NULL; 1258 } 1259 1260 static int virtio_ccw_offline(struct ccw_device *cdev) 1261 { 1262 unsigned long flags; 1263 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1264 1265 if (!vcdev) 1266 return 0; 1267 if (vcdev->device_lost) 1268 virtio_break_device(&vcdev->vdev); 1269 unregister_virtio_device(&vcdev->vdev); 1270 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1271 dev_set_drvdata(&cdev->dev, NULL); 1272 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1273 return 0; 1274 } 1275 1276 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev) 1277 { 1278 struct virtio_rev_info *rev; 1279 struct ccw1 *ccw; 1280 int ret; 1281 1282 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); 1283 if (!ccw) 1284 return -ENOMEM; 1285 rev = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*rev)); 1286 if (!rev) { 1287 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 1288 return -ENOMEM; 1289 } 1290 1291 /* Set transport revision */ 1292 ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV; 1293 ccw->flags = 0; 1294 ccw->count = sizeof(*rev); 1295 ccw->cda = (__u32)virt_to_phys(rev); 1296 1297 vcdev->revision = VIRTIO_CCW_REV_MAX; 1298 do { 1299 rev->revision = vcdev->revision; 1300 /* none of our supported revisions carry payload */ 1301 rev->length = 0; 1302 ret = ccw_io_helper(vcdev, ccw, 1303 VIRTIO_CCW_DOING_SET_VIRTIO_REV); 1304 if (ret == -EOPNOTSUPP) { 1305 if (vcdev->revision == 0) 1306 /* 1307 * The host device does not support setting 1308 * the revision: let's operate it in legacy 1309 * mode. 1310 */ 1311 ret = 0; 1312 else 1313 vcdev->revision--; 1314 } 1315 } while (ret == -EOPNOTSUPP); 1316 1317 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 1318 ccw_device_dma_free(vcdev->cdev, rev, sizeof(*rev)); 1319 return ret; 1320 } 1321 1322 static int virtio_ccw_online(struct ccw_device *cdev) 1323 { 1324 int ret; 1325 struct virtio_ccw_device *vcdev; 1326 unsigned long flags; 1327 1328 vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL); 1329 if (!vcdev) { 1330 dev_warn(&cdev->dev, "Could not get memory for virtio\n"); 1331 ret = -ENOMEM; 1332 goto out_free; 1333 } 1334 vcdev->vdev.dev.parent = &cdev->dev; 1335 vcdev->cdev = cdev; 1336 vcdev->dma_area = ccw_device_dma_zalloc(vcdev->cdev, 1337 sizeof(*vcdev->dma_area)); 1338 if (!vcdev->dma_area) { 1339 ret = -ENOMEM; 1340 goto out_free; 1341 } 1342 1343 vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */ 1344 1345 vcdev->vdev.dev.release = virtio_ccw_release_dev; 1346 vcdev->vdev.config = &virtio_ccw_config_ops; 1347 init_waitqueue_head(&vcdev->wait_q); 1348 INIT_LIST_HEAD(&vcdev->virtqueues); 1349 spin_lock_init(&vcdev->lock); 1350 rwlock_init(&vcdev->irq_lock); 1351 mutex_init(&vcdev->io_lock); 1352 1353 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1354 dev_set_drvdata(&cdev->dev, vcdev); 1355 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1356 vcdev->vdev.id.vendor = cdev->id.cu_type; 1357 vcdev->vdev.id.device = cdev->id.cu_model; 1358 1359 ret = virtio_ccw_set_transport_rev(vcdev); 1360 if (ret) 1361 goto out_free; 1362 1363 ret = register_virtio_device(&vcdev->vdev); 1364 if (ret) { 1365 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n", 1366 ret); 1367 goto out_put; 1368 } 1369 return 0; 1370 out_put: 1371 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1372 dev_set_drvdata(&cdev->dev, NULL); 1373 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1374 put_device(&vcdev->vdev.dev); 1375 return ret; 1376 out_free: 1377 if (vcdev) { 1378 ccw_device_dma_free(vcdev->cdev, vcdev->dma_area, 1379 sizeof(*vcdev->dma_area)); 1380 } 1381 kfree(vcdev); 1382 return ret; 1383 } 1384 1385 static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event) 1386 { 1387 int rc; 1388 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1389 1390 /* 1391 * Make sure vcdev is set 1392 * i.e. set_offline/remove callback not already running 1393 */ 1394 if (!vcdev) 1395 return NOTIFY_DONE; 1396 1397 switch (event) { 1398 case CIO_GONE: 1399 vcdev->device_lost = true; 1400 rc = NOTIFY_DONE; 1401 break; 1402 case CIO_OPER: 1403 rc = NOTIFY_OK; 1404 break; 1405 default: 1406 rc = NOTIFY_DONE; 1407 break; 1408 } 1409 return rc; 1410 } 1411 1412 static struct ccw_device_id virtio_ids[] = { 1413 { CCW_DEVICE(0x3832, 0) }, 1414 {}, 1415 }; 1416 1417 static struct ccw_driver virtio_ccw_driver = { 1418 .driver = { 1419 .owner = THIS_MODULE, 1420 .name = "virtio_ccw", 1421 }, 1422 .ids = virtio_ids, 1423 .probe = virtio_ccw_probe, 1424 .remove = virtio_ccw_remove, 1425 .set_offline = virtio_ccw_offline, 1426 .set_online = virtio_ccw_online, 1427 .notify = virtio_ccw_cio_notify, 1428 .int_class = IRQIO_VIR, 1429 }; 1430 1431 static int __init pure_hex(char **cp, unsigned int *val, int min_digit, 1432 int max_digit, int max_val) 1433 { 1434 int diff; 1435 1436 diff = 0; 1437 *val = 0; 1438 1439 while (diff <= max_digit) { 1440 int value = hex_to_bin(**cp); 1441 1442 if (value < 0) 1443 break; 1444 *val = *val * 16 + value; 1445 (*cp)++; 1446 diff++; 1447 } 1448 1449 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) 1450 return 1; 1451 1452 return 0; 1453 } 1454 1455 static int __init parse_busid(char *str, unsigned int *cssid, 1456 unsigned int *ssid, unsigned int *devno) 1457 { 1458 char *str_work; 1459 int rc, ret; 1460 1461 rc = 1; 1462 1463 if (*str == '\0') 1464 goto out; 1465 1466 str_work = str; 1467 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); 1468 if (ret || (str_work[0] != '.')) 1469 goto out; 1470 str_work++; 1471 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); 1472 if (ret || (str_work[0] != '.')) 1473 goto out; 1474 str_work++; 1475 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); 1476 if (ret || (str_work[0] != '\0')) 1477 goto out; 1478 1479 rc = 0; 1480 out: 1481 return rc; 1482 } 1483 1484 static void __init no_auto_parse(void) 1485 { 1486 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; 1487 char *parm, *str; 1488 int rc; 1489 1490 str = no_auto; 1491 while ((parm = strsep(&str, ","))) { 1492 rc = parse_busid(strsep(&parm, "-"), &from_cssid, 1493 &from_ssid, &from); 1494 if (rc) 1495 continue; 1496 if (parm != NULL) { 1497 rc = parse_busid(parm, &to_cssid, 1498 &to_ssid, &to); 1499 if ((from_ssid > to_ssid) || 1500 ((from_ssid == to_ssid) && (from > to))) 1501 rc = -EINVAL; 1502 } else { 1503 to_cssid = from_cssid; 1504 to_ssid = from_ssid; 1505 to = from; 1506 } 1507 if (rc) 1508 continue; 1509 while ((from_ssid < to_ssid) || 1510 ((from_ssid == to_ssid) && (from <= to))) { 1511 set_bit(from, devs_no_auto[from_ssid]); 1512 from++; 1513 if (from > __MAX_SUBCHANNEL) { 1514 from_ssid++; 1515 from = 0; 1516 } 1517 } 1518 } 1519 } 1520 1521 static int __init virtio_ccw_init(void) 1522 { 1523 int rc; 1524 1525 /* parse no_auto string before we do anything further */ 1526 no_auto_parse(); 1527 1528 summary_indicators = cio_dma_zalloc(MAX_AIRQ_AREAS); 1529 if (!summary_indicators) 1530 return -ENOMEM; 1531 rc = ccw_driver_register(&virtio_ccw_driver); 1532 if (rc) 1533 cio_dma_free(summary_indicators, MAX_AIRQ_AREAS); 1534 return rc; 1535 } 1536 device_initcall(virtio_ccw_init); 1537