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 dma32_t dma_area_addr; 76 }; 77 78 static inline unsigned long *indicators(struct virtio_ccw_device *vcdev) 79 { 80 return &vcdev->dma_area->indicators; 81 } 82 83 static inline unsigned long *indicators2(struct virtio_ccw_device *vcdev) 84 { 85 return &vcdev->dma_area->indicators2; 86 } 87 88 /* Spec stipulates a 64 bit address */ 89 static inline dma64_t indicators_dma(struct virtio_ccw_device *vcdev) 90 { 91 u64 dma_area_addr = dma32_to_u32(vcdev->dma_area_addr); 92 93 return dma64_add(u64_to_dma64(dma_area_addr), 94 offsetof(struct vcdev_dma_area, indicators)); 95 } 96 97 /* Spec stipulates a 64 bit address */ 98 static inline dma64_t indicators2_dma(struct virtio_ccw_device *vcdev) 99 { 100 u64 dma_area_addr = dma32_to_u32(vcdev->dma_area_addr); 101 102 return dma64_add(u64_to_dma64(dma_area_addr), 103 offsetof(struct vcdev_dma_area, indicators2)); 104 } 105 106 static inline dma32_t config_block_dma(struct virtio_ccw_device *vcdev) 107 { 108 return dma32_add(vcdev->dma_area_addr, 109 offsetof(struct vcdev_dma_area, config_block)); 110 } 111 112 static inline dma32_t status_dma(struct virtio_ccw_device *vcdev) 113 { 114 return dma32_add(vcdev->dma_area_addr, 115 offsetof(struct vcdev_dma_area, status)); 116 } 117 118 struct vq_info_block_legacy { 119 dma64_t queue; 120 __u32 align; 121 __u16 index; 122 __u16 num; 123 } __packed; 124 125 struct vq_info_block { 126 dma64_t desc; 127 __u32 res0; 128 __u16 index; 129 __u16 num; 130 dma64_t avail; 131 dma64_t used; 132 } __packed; 133 134 struct virtio_feature_desc { 135 __le32 features; 136 __u8 index; 137 } __packed; 138 139 struct virtio_thinint_area { 140 dma64_t summary_indicator; 141 dma64_t indicator; 142 u64 bit_nr; 143 u8 isc; 144 } __packed; 145 146 struct virtio_rev_info { 147 __u16 revision; 148 __u16 length; 149 __u8 data[]; 150 }; 151 152 /* the highest virtio-ccw revision we support */ 153 #define VIRTIO_CCW_REV_MAX 2 154 155 struct virtio_ccw_vq_info { 156 struct virtqueue *vq; 157 dma32_t info_block_addr; 158 int num; 159 union { 160 struct vq_info_block s; 161 struct vq_info_block_legacy l; 162 } *info_block; 163 int bit_nr; 164 struct list_head node; 165 long cookie; 166 }; 167 168 #define VIRTIO_AIRQ_ISC IO_SCH_ISC /* inherit from subchannel */ 169 170 #define VIRTIO_IV_BITS (L1_CACHE_BYTES * 8) 171 #define MAX_AIRQ_AREAS 20 172 173 static int virtio_ccw_use_airq = 1; 174 175 struct airq_info { 176 rwlock_t lock; 177 u8 summary_indicator_idx; 178 struct airq_struct airq; 179 struct airq_iv *aiv; 180 }; 181 static struct airq_info *airq_areas[MAX_AIRQ_AREAS]; 182 static DEFINE_MUTEX(airq_areas_lock); 183 184 static u8 *summary_indicators; 185 186 static inline u8 *get_summary_indicator(struct airq_info *info) 187 { 188 return summary_indicators + info->summary_indicator_idx; 189 } 190 191 static inline dma64_t get_summary_indicator_dma(struct airq_info *info) 192 { 193 return virt_to_dma64(get_summary_indicator(info)); 194 } 195 196 #define CCW_CMD_SET_VQ 0x13 197 #define CCW_CMD_VDEV_RESET 0x33 198 #define CCW_CMD_SET_IND 0x43 199 #define CCW_CMD_SET_CONF_IND 0x53 200 #define CCW_CMD_READ_FEAT 0x12 201 #define CCW_CMD_WRITE_FEAT 0x11 202 #define CCW_CMD_READ_CONF 0x22 203 #define CCW_CMD_WRITE_CONF 0x21 204 #define CCW_CMD_WRITE_STATUS 0x31 205 #define CCW_CMD_READ_VQ_CONF 0x32 206 #define CCW_CMD_READ_STATUS 0x72 207 #define CCW_CMD_SET_IND_ADAPTER 0x73 208 #define CCW_CMD_SET_VIRTIO_REV 0x83 209 210 #define VIRTIO_CCW_DOING_SET_VQ 0x00010000 211 #define VIRTIO_CCW_DOING_RESET 0x00040000 212 #define VIRTIO_CCW_DOING_READ_FEAT 0x00080000 213 #define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000 214 #define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000 215 #define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000 216 #define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000 217 #define VIRTIO_CCW_DOING_SET_IND 0x01000000 218 #define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000 219 #define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000 220 #define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000 221 #define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000 222 #define VIRTIO_CCW_DOING_READ_STATUS 0x20000000 223 #define VIRTIO_CCW_INTPARM_MASK 0xffff0000 224 225 static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev) 226 { 227 return container_of(vdev, struct virtio_ccw_device, vdev); 228 } 229 230 static void drop_airq_indicator(struct virtqueue *vq, struct airq_info *info) 231 { 232 unsigned long i, flags; 233 234 write_lock_irqsave(&info->lock, flags); 235 for (i = 0; i < airq_iv_end(info->aiv); i++) { 236 if (vq == (void *)airq_iv_get_ptr(info->aiv, i)) { 237 airq_iv_free_bit(info->aiv, i); 238 airq_iv_set_ptr(info->aiv, i, 0); 239 break; 240 } 241 } 242 write_unlock_irqrestore(&info->lock, flags); 243 } 244 245 static void virtio_airq_handler(struct airq_struct *airq, 246 struct tpi_info *tpi_info) 247 { 248 struct airq_info *info = container_of(airq, struct airq_info, airq); 249 unsigned long ai; 250 251 inc_irq_stat(IRQIO_VAI); 252 read_lock(&info->lock); 253 /* Walk through indicators field, summary indicator active. */ 254 for (ai = 0;;) { 255 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv)); 256 if (ai == -1UL) 257 break; 258 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai)); 259 } 260 *(get_summary_indicator(info)) = 0; 261 smp_wmb(); 262 /* Walk through indicators field, summary indicator not active. */ 263 for (ai = 0;;) { 264 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv)); 265 if (ai == -1UL) 266 break; 267 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai)); 268 } 269 read_unlock(&info->lock); 270 } 271 272 static struct airq_info *new_airq_info(int index) 273 { 274 struct airq_info *info; 275 int rc; 276 277 info = kzalloc(sizeof(*info), GFP_KERNEL); 278 if (!info) 279 return NULL; 280 rwlock_init(&info->lock); 281 info->aiv = airq_iv_create(VIRTIO_IV_BITS, AIRQ_IV_ALLOC | AIRQ_IV_PTR 282 | AIRQ_IV_CACHELINE, NULL); 283 if (!info->aiv) { 284 kfree(info); 285 return NULL; 286 } 287 info->airq.handler = virtio_airq_handler; 288 info->summary_indicator_idx = index; 289 info->airq.lsi_ptr = get_summary_indicator(info); 290 info->airq.isc = VIRTIO_AIRQ_ISC; 291 rc = register_adapter_interrupt(&info->airq); 292 if (rc) { 293 airq_iv_release(info->aiv); 294 kfree(info); 295 return NULL; 296 } 297 return info; 298 } 299 300 static unsigned long *get_airq_indicator(struct virtqueue *vqs[], int nvqs, 301 u64 *first, void **airq_info) 302 { 303 int i, j; 304 struct airq_info *info; 305 unsigned long *indicator_addr = NULL; 306 unsigned long bit, flags; 307 308 for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) { 309 mutex_lock(&airq_areas_lock); 310 if (!airq_areas[i]) 311 airq_areas[i] = new_airq_info(i); 312 info = airq_areas[i]; 313 mutex_unlock(&airq_areas_lock); 314 if (!info) 315 return NULL; 316 write_lock_irqsave(&info->lock, flags); 317 bit = airq_iv_alloc(info->aiv, nvqs); 318 if (bit == -1UL) { 319 /* Not enough vacancies. */ 320 write_unlock_irqrestore(&info->lock, flags); 321 continue; 322 } 323 *first = bit; 324 *airq_info = info; 325 indicator_addr = info->aiv->vector; 326 for (j = 0; j < nvqs; j++) { 327 airq_iv_set_ptr(info->aiv, bit + j, 328 (unsigned long)vqs[j]); 329 } 330 write_unlock_irqrestore(&info->lock, flags); 331 } 332 return indicator_addr; 333 } 334 335 static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev) 336 { 337 struct virtio_ccw_vq_info *info; 338 339 if (!vcdev->airq_info) 340 return; 341 list_for_each_entry(info, &vcdev->virtqueues, node) 342 drop_airq_indicator(info->vq, vcdev->airq_info); 343 } 344 345 static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag) 346 { 347 unsigned long flags; 348 __u32 ret; 349 350 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); 351 if (vcdev->err) 352 ret = 0; 353 else 354 ret = vcdev->curr_io & flag; 355 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); 356 return ret; 357 } 358 359 static int ccw_io_helper(struct virtio_ccw_device *vcdev, 360 struct ccw1 *ccw, __u32 intparm) 361 { 362 int ret; 363 unsigned long flags; 364 int flag = intparm & VIRTIO_CCW_INTPARM_MASK; 365 366 mutex_lock(&vcdev->io_lock); 367 do { 368 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); 369 ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0); 370 if (!ret) { 371 if (!vcdev->curr_io) 372 vcdev->err = 0; 373 vcdev->curr_io |= flag; 374 } 375 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); 376 cpu_relax(); 377 } while (ret == -EBUSY); 378 wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0); 379 ret = ret ? ret : vcdev->err; 380 mutex_unlock(&vcdev->io_lock); 381 return ret; 382 } 383 384 static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev, 385 struct ccw1 *ccw) 386 { 387 int ret; 388 struct virtio_thinint_area *thinint_area = NULL; 389 struct airq_info *airq_info = vcdev->airq_info; 390 dma64_t *indicatorp = NULL; 391 392 if (vcdev->is_thinint) { 393 thinint_area = ccw_device_dma_zalloc(vcdev->cdev, 394 sizeof(*thinint_area), 395 &ccw->cda); 396 if (!thinint_area) 397 return; 398 thinint_area->summary_indicator = 399 get_summary_indicator_dma(airq_info); 400 thinint_area->isc = VIRTIO_AIRQ_ISC; 401 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; 402 ccw->count = sizeof(*thinint_area); 403 } else { 404 /* payload is the address of the indicators */ 405 indicatorp = ccw_device_dma_zalloc(vcdev->cdev, 406 sizeof(*indicatorp), 407 &ccw->cda); 408 if (!indicatorp) 409 return; 410 *indicatorp = 0; 411 ccw->cmd_code = CCW_CMD_SET_IND; 412 ccw->count = sizeof(*indicatorp); 413 } 414 /* Deregister indicators from host. */ 415 *indicators(vcdev) = 0; 416 ccw->flags = 0; 417 ret = ccw_io_helper(vcdev, ccw, 418 vcdev->is_thinint ? 419 VIRTIO_CCW_DOING_SET_IND_ADAPTER : 420 VIRTIO_CCW_DOING_SET_IND); 421 if (ret && (ret != -ENODEV)) 422 dev_info(&vcdev->cdev->dev, 423 "Failed to deregister indicators (%d)\n", ret); 424 else if (vcdev->is_thinint) 425 virtio_ccw_drop_indicators(vcdev); 426 ccw_device_dma_free(vcdev->cdev, indicatorp, sizeof(*indicatorp)); 427 ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area)); 428 } 429 430 static inline bool virtio_ccw_do_kvm_notify(struct virtqueue *vq, u32 data) 431 { 432 struct virtio_ccw_vq_info *info = vq->priv; 433 struct virtio_ccw_device *vcdev; 434 struct subchannel_id schid; 435 436 vcdev = to_vc_device(info->vq->vdev); 437 ccw_device_get_schid(vcdev->cdev, &schid); 438 BUILD_BUG_ON(sizeof(struct subchannel_id) != sizeof(unsigned int)); 439 info->cookie = kvm_hypercall3(KVM_S390_VIRTIO_CCW_NOTIFY, 440 *((unsigned int *)&schid), 441 data, info->cookie); 442 if (info->cookie < 0) 443 return false; 444 return true; 445 } 446 447 static bool virtio_ccw_kvm_notify(struct virtqueue *vq) 448 { 449 return virtio_ccw_do_kvm_notify(vq, vq->index); 450 } 451 452 static bool virtio_ccw_kvm_notify_with_data(struct virtqueue *vq) 453 { 454 return virtio_ccw_do_kvm_notify(vq, vring_notification_data(vq)); 455 } 456 457 static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev, 458 struct ccw1 *ccw, int index) 459 { 460 int ret; 461 462 vcdev->dma_area->config_block.index = index; 463 ccw->cmd_code = CCW_CMD_READ_VQ_CONF; 464 ccw->flags = 0; 465 ccw->count = sizeof(struct vq_config_block); 466 ccw->cda = config_block_dma(vcdev); 467 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF); 468 if (ret) 469 return ret; 470 return vcdev->dma_area->config_block.num ?: -ENOENT; 471 } 472 473 static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw) 474 { 475 struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev); 476 struct virtio_ccw_vq_info *info = vq->priv; 477 unsigned long flags; 478 int ret; 479 unsigned int index = vq->index; 480 481 /* Remove from our list. */ 482 spin_lock_irqsave(&vcdev->lock, flags); 483 list_del(&info->node); 484 spin_unlock_irqrestore(&vcdev->lock, flags); 485 486 /* Release from host. */ 487 if (vcdev->revision == 0) { 488 info->info_block->l.queue = 0; 489 info->info_block->l.align = 0; 490 info->info_block->l.index = index; 491 info->info_block->l.num = 0; 492 ccw->count = sizeof(info->info_block->l); 493 } else { 494 info->info_block->s.desc = 0; 495 info->info_block->s.index = index; 496 info->info_block->s.num = 0; 497 info->info_block->s.avail = 0; 498 info->info_block->s.used = 0; 499 ccw->count = sizeof(info->info_block->s); 500 } 501 ccw->cmd_code = CCW_CMD_SET_VQ; 502 ccw->flags = 0; 503 ccw->cda = info->info_block_addr; 504 ret = ccw_io_helper(vcdev, ccw, 505 VIRTIO_CCW_DOING_SET_VQ | index); 506 /* 507 * -ENODEV isn't considered an error: The device is gone anyway. 508 * This may happen on device detach. 509 */ 510 if (ret && (ret != -ENODEV)) 511 dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d\n", 512 ret, index); 513 514 vring_del_virtqueue(vq); 515 ccw_device_dma_free(vcdev->cdev, info->info_block, 516 sizeof(*info->info_block)); 517 kfree(info); 518 } 519 520 static void virtio_ccw_del_vqs(struct virtio_device *vdev) 521 { 522 struct virtqueue *vq, *n; 523 struct ccw1 *ccw; 524 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 525 526 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 527 if (!ccw) 528 return; 529 530 virtio_ccw_drop_indicator(vcdev, ccw); 531 532 list_for_each_entry_safe(vq, n, &vdev->vqs, list) 533 virtio_ccw_del_vq(vq, ccw); 534 535 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 536 } 537 538 static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev, 539 int i, vq_callback_t *callback, 540 const char *name, bool ctx, 541 struct ccw1 *ccw) 542 { 543 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 544 bool (*notify)(struct virtqueue *vq); 545 int err; 546 struct virtqueue *vq = NULL; 547 struct virtio_ccw_vq_info *info; 548 u64 queue; 549 unsigned long flags; 550 bool may_reduce; 551 552 if (__virtio_test_bit(vdev, VIRTIO_F_NOTIFICATION_DATA)) 553 notify = virtio_ccw_kvm_notify_with_data; 554 else 555 notify = virtio_ccw_kvm_notify; 556 557 /* Allocate queue. */ 558 info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL); 559 if (!info) { 560 dev_warn(&vcdev->cdev->dev, "no info\n"); 561 err = -ENOMEM; 562 goto out_err; 563 } 564 info->info_block = ccw_device_dma_zalloc(vcdev->cdev, 565 sizeof(*info->info_block), 566 &info->info_block_addr); 567 if (!info->info_block) { 568 dev_warn(&vcdev->cdev->dev, "no info block\n"); 569 err = -ENOMEM; 570 goto out_err; 571 } 572 info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i); 573 if (info->num < 0) { 574 err = info->num; 575 goto out_err; 576 } 577 may_reduce = vcdev->revision > 0; 578 vq = vring_create_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, 579 vdev, true, may_reduce, ctx, 580 notify, callback, name); 581 582 if (!vq) { 583 /* For now, we fail if we can't get the requested size. */ 584 dev_warn(&vcdev->cdev->dev, "no vq\n"); 585 err = -ENOMEM; 586 goto out_err; 587 } 588 589 vq->num_max = info->num; 590 591 /* it may have been reduced */ 592 info->num = virtqueue_get_vring_size(vq); 593 594 /* Register it with the host. */ 595 queue = virtqueue_get_desc_addr(vq); 596 if (vcdev->revision == 0) { 597 info->info_block->l.queue = u64_to_dma64(queue); 598 info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN; 599 info->info_block->l.index = i; 600 info->info_block->l.num = info->num; 601 ccw->count = sizeof(info->info_block->l); 602 } else { 603 info->info_block->s.desc = u64_to_dma64(queue); 604 info->info_block->s.index = i; 605 info->info_block->s.num = info->num; 606 info->info_block->s.avail = u64_to_dma64(virtqueue_get_avail_addr(vq)); 607 info->info_block->s.used = u64_to_dma64(virtqueue_get_used_addr(vq)); 608 ccw->count = sizeof(info->info_block->s); 609 } 610 ccw->cmd_code = CCW_CMD_SET_VQ; 611 ccw->flags = 0; 612 ccw->cda = info->info_block_addr; 613 err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i); 614 if (err) { 615 dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n"); 616 goto out_err; 617 } 618 619 info->vq = vq; 620 vq->priv = info; 621 622 /* Save it to our list. */ 623 spin_lock_irqsave(&vcdev->lock, flags); 624 list_add(&info->node, &vcdev->virtqueues); 625 spin_unlock_irqrestore(&vcdev->lock, flags); 626 627 return vq; 628 629 out_err: 630 if (vq) 631 vring_del_virtqueue(vq); 632 if (info) { 633 ccw_device_dma_free(vcdev->cdev, info->info_block, 634 sizeof(*info->info_block)); 635 } 636 kfree(info); 637 return ERR_PTR(err); 638 } 639 640 static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev, 641 struct virtqueue *vqs[], int nvqs, 642 struct ccw1 *ccw) 643 { 644 int ret; 645 struct virtio_thinint_area *thinint_area = NULL; 646 unsigned long *indicator_addr; 647 struct airq_info *info; 648 649 thinint_area = ccw_device_dma_zalloc(vcdev->cdev, 650 sizeof(*thinint_area), 651 &ccw->cda); 652 if (!thinint_area) { 653 ret = -ENOMEM; 654 goto out; 655 } 656 /* Try to get an indicator. */ 657 indicator_addr = get_airq_indicator(vqs, nvqs, 658 &thinint_area->bit_nr, 659 &vcdev->airq_info); 660 if (!indicator_addr) { 661 ret = -ENOSPC; 662 goto out; 663 } 664 thinint_area->indicator = virt_to_dma64(indicator_addr); 665 info = vcdev->airq_info; 666 thinint_area->summary_indicator = get_summary_indicator_dma(info); 667 thinint_area->isc = VIRTIO_AIRQ_ISC; 668 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; 669 ccw->flags = CCW_FLAG_SLI; 670 ccw->count = sizeof(*thinint_area); 671 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER); 672 if (ret) { 673 if (ret == -EOPNOTSUPP) { 674 /* 675 * The host does not support adapter interrupts 676 * for virtio-ccw, stop trying. 677 */ 678 virtio_ccw_use_airq = 0; 679 pr_info("Adapter interrupts unsupported on host\n"); 680 } else 681 dev_warn(&vcdev->cdev->dev, 682 "enabling adapter interrupts = %d\n", ret); 683 virtio_ccw_drop_indicators(vcdev); 684 } 685 out: 686 ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area)); 687 return ret; 688 } 689 690 static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, 691 struct virtqueue *vqs[], 692 struct virtqueue_info vqs_info[], 693 struct irq_affinity *desc) 694 { 695 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 696 dma64_t *indicatorp = NULL; 697 int ret, i, queue_idx = 0; 698 struct ccw1 *ccw; 699 dma32_t indicatorp_dma = 0; 700 701 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 702 if (!ccw) 703 return -ENOMEM; 704 705 for (i = 0; i < nvqs; ++i) { 706 struct virtqueue_info *vqi = &vqs_info[i]; 707 708 if (!vqi->name) { 709 vqs[i] = NULL; 710 continue; 711 } 712 713 vqs[i] = virtio_ccw_setup_vq(vdev, queue_idx++, vqi->callback, 714 vqi->name, vqi->ctx, ccw); 715 if (IS_ERR(vqs[i])) { 716 ret = PTR_ERR(vqs[i]); 717 vqs[i] = NULL; 718 goto out; 719 } 720 } 721 ret = -ENOMEM; 722 /* 723 * We need a data area under 2G to communicate. Our payload is 724 * the address of the indicators. 725 */ 726 indicatorp = ccw_device_dma_zalloc(vcdev->cdev, 727 sizeof(*indicatorp), 728 &indicatorp_dma); 729 if (!indicatorp) 730 goto out; 731 *indicatorp = indicators_dma(vcdev); 732 if (vcdev->is_thinint) { 733 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw); 734 if (ret) 735 /* no error, just fall back to legacy interrupts */ 736 vcdev->is_thinint = false; 737 } 738 ccw->cda = indicatorp_dma; 739 if (!vcdev->is_thinint) { 740 /* Register queue indicators with host. */ 741 *indicators(vcdev) = 0; 742 ccw->cmd_code = CCW_CMD_SET_IND; 743 ccw->flags = 0; 744 ccw->count = sizeof(*indicatorp); 745 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND); 746 if (ret) 747 goto out; 748 } 749 /* Register indicators2 with host for config changes */ 750 *indicatorp = indicators2_dma(vcdev); 751 *indicators2(vcdev) = 0; 752 ccw->cmd_code = CCW_CMD_SET_CONF_IND; 753 ccw->flags = 0; 754 ccw->count = sizeof(*indicatorp); 755 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND); 756 if (ret) 757 goto out; 758 759 if (indicatorp) 760 ccw_device_dma_free(vcdev->cdev, indicatorp, 761 sizeof(*indicatorp)); 762 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 763 return 0; 764 out: 765 if (indicatorp) 766 ccw_device_dma_free(vcdev->cdev, indicatorp, 767 sizeof(*indicatorp)); 768 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 769 virtio_ccw_del_vqs(vdev); 770 return ret; 771 } 772 773 static void virtio_ccw_reset(struct virtio_device *vdev) 774 { 775 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 776 struct ccw1 *ccw; 777 778 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 779 if (!ccw) 780 return; 781 782 /* Zero status bits. */ 783 vcdev->dma_area->status = 0; 784 785 /* Send a reset ccw on device. */ 786 ccw->cmd_code = CCW_CMD_VDEV_RESET; 787 ccw->flags = 0; 788 ccw->count = 0; 789 ccw->cda = 0; 790 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET); 791 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 792 } 793 794 static u64 virtio_ccw_get_features(struct virtio_device *vdev) 795 { 796 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 797 struct virtio_feature_desc *features; 798 int ret; 799 u64 rc; 800 struct ccw1 *ccw; 801 802 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 803 if (!ccw) 804 return 0; 805 806 features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features), 807 &ccw->cda); 808 if (!features) { 809 rc = 0; 810 goto out_free; 811 } 812 /* Read the feature bits from the host. */ 813 features->index = 0; 814 ccw->cmd_code = CCW_CMD_READ_FEAT; 815 ccw->flags = 0; 816 ccw->count = sizeof(*features); 817 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 818 if (ret) { 819 rc = 0; 820 goto out_free; 821 } 822 823 rc = le32_to_cpu(features->features); 824 825 if (vcdev->revision == 0) 826 goto out_free; 827 828 /* Read second half of the feature bits from the host. */ 829 features->index = 1; 830 ccw->cmd_code = CCW_CMD_READ_FEAT; 831 ccw->flags = 0; 832 ccw->count = sizeof(*features); 833 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 834 if (ret == 0) 835 rc |= (u64)le32_to_cpu(features->features) << 32; 836 837 out_free: 838 ccw_device_dma_free(vcdev->cdev, features, sizeof(*features)); 839 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 840 return rc; 841 } 842 843 static void ccw_transport_features(struct virtio_device *vdev) 844 { 845 /* 846 * Currently nothing to do here. 847 */ 848 } 849 850 static int virtio_ccw_finalize_features(struct virtio_device *vdev) 851 { 852 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 853 struct virtio_feature_desc *features; 854 struct ccw1 *ccw; 855 int ret; 856 857 if (vcdev->revision >= 1 && 858 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { 859 dev_err(&vdev->dev, "virtio: device uses revision 1 " 860 "but does not have VIRTIO_F_VERSION_1\n"); 861 return -EINVAL; 862 } 863 864 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 865 if (!ccw) 866 return -ENOMEM; 867 868 features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features), 869 &ccw->cda); 870 if (!features) { 871 ret = -ENOMEM; 872 goto out_free; 873 } 874 /* Give virtio_ring a chance to accept features. */ 875 vring_transport_features(vdev); 876 877 /* Give virtio_ccw a chance to accept features. */ 878 ccw_transport_features(vdev); 879 880 features->index = 0; 881 features->features = cpu_to_le32((u32)vdev->features); 882 /* Write the first half of the feature bits to the host. */ 883 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 884 ccw->flags = 0; 885 ccw->count = sizeof(*features); 886 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 887 if (ret) 888 goto out_free; 889 890 if (vcdev->revision == 0) 891 goto out_free; 892 893 features->index = 1; 894 features->features = cpu_to_le32(vdev->features >> 32); 895 /* Write the second half of the feature bits to the host. */ 896 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 897 ccw->flags = 0; 898 ccw->count = sizeof(*features); 899 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 900 901 out_free: 902 ccw_device_dma_free(vcdev->cdev, features, sizeof(*features)); 903 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 904 905 return ret; 906 } 907 908 static void virtio_ccw_get_config(struct virtio_device *vdev, 909 unsigned int offset, void *buf, unsigned len) 910 { 911 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 912 int ret; 913 struct ccw1 *ccw; 914 void *config_area; 915 unsigned long flags; 916 917 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 918 if (!ccw) 919 return; 920 921 config_area = ccw_device_dma_zalloc(vcdev->cdev, 922 VIRTIO_CCW_CONFIG_SIZE, 923 &ccw->cda); 924 if (!config_area) 925 goto out_free; 926 927 /* Read the config area from the host. */ 928 ccw->cmd_code = CCW_CMD_READ_CONF; 929 ccw->flags = 0; 930 ccw->count = offset + len; 931 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG); 932 if (ret) 933 goto out_free; 934 935 spin_lock_irqsave(&vcdev->lock, flags); 936 memcpy(vcdev->config, config_area, offset + len); 937 if (vcdev->config_ready < offset + len) 938 vcdev->config_ready = offset + len; 939 spin_unlock_irqrestore(&vcdev->lock, flags); 940 if (buf) 941 memcpy(buf, config_area + offset, len); 942 943 out_free: 944 ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE); 945 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 946 } 947 948 static void virtio_ccw_set_config(struct virtio_device *vdev, 949 unsigned int offset, const void *buf, 950 unsigned len) 951 { 952 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 953 struct ccw1 *ccw; 954 void *config_area; 955 unsigned long flags; 956 957 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 958 if (!ccw) 959 return; 960 961 config_area = ccw_device_dma_zalloc(vcdev->cdev, 962 VIRTIO_CCW_CONFIG_SIZE, 963 &ccw->cda); 964 if (!config_area) 965 goto out_free; 966 967 /* Make sure we don't overwrite fields. */ 968 if (vcdev->config_ready < offset) 969 virtio_ccw_get_config(vdev, 0, NULL, offset); 970 spin_lock_irqsave(&vcdev->lock, flags); 971 memcpy(&vcdev->config[offset], buf, len); 972 /* Write the config area to the host. */ 973 memcpy(config_area, vcdev->config, sizeof(vcdev->config)); 974 spin_unlock_irqrestore(&vcdev->lock, flags); 975 ccw->cmd_code = CCW_CMD_WRITE_CONF; 976 ccw->flags = 0; 977 ccw->count = offset + len; 978 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG); 979 980 out_free: 981 ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE); 982 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 983 } 984 985 static u8 virtio_ccw_get_status(struct virtio_device *vdev) 986 { 987 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 988 u8 old_status = vcdev->dma_area->status; 989 struct ccw1 *ccw; 990 991 if (vcdev->revision < 2) 992 return vcdev->dma_area->status; 993 994 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 995 if (!ccw) 996 return old_status; 997 998 ccw->cmd_code = CCW_CMD_READ_STATUS; 999 ccw->flags = 0; 1000 ccw->count = sizeof(vcdev->dma_area->status); 1001 ccw->cda = status_dma(vcdev); 1002 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS); 1003 /* 1004 * If the channel program failed (should only happen if the device 1005 * was hotunplugged, and then we clean up via the machine check 1006 * handler anyway), vcdev->dma_area->status was not overwritten and we just 1007 * return the old status, which is fine. 1008 */ 1009 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 1010 1011 return vcdev->dma_area->status; 1012 } 1013 1014 static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status) 1015 { 1016 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 1017 u8 old_status = vcdev->dma_area->status; 1018 struct ccw1 *ccw; 1019 int ret; 1020 1021 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 1022 if (!ccw) 1023 return; 1024 1025 /* Write the status to the host. */ 1026 vcdev->dma_area->status = status; 1027 ccw->cmd_code = CCW_CMD_WRITE_STATUS; 1028 ccw->flags = 0; 1029 ccw->count = sizeof(status); 1030 /* We use ssch for setting the status which is a serializing 1031 * instruction that guarantees the memory writes have 1032 * completed before ssch. 1033 */ 1034 ccw->cda = status_dma(vcdev); 1035 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS); 1036 /* Write failed? We assume status is unchanged. */ 1037 if (ret) 1038 vcdev->dma_area->status = old_status; 1039 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 1040 } 1041 1042 static const char *virtio_ccw_bus_name(struct virtio_device *vdev) 1043 { 1044 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 1045 1046 return dev_name(&vcdev->cdev->dev); 1047 } 1048 1049 static void virtio_ccw_synchronize_cbs(struct virtio_device *vdev) 1050 { 1051 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 1052 struct airq_info *info = vcdev->airq_info; 1053 1054 if (info) { 1055 /* 1056 * This device uses adapter interrupts: synchronize with 1057 * vring_interrupt() called by virtio_airq_handler() 1058 * via the indicator area lock. 1059 */ 1060 write_lock_irq(&info->lock); 1061 write_unlock_irq(&info->lock); 1062 } else { 1063 /* This device uses classic interrupts: synchronize 1064 * with vring_interrupt() called by 1065 * virtio_ccw_int_handler() via the per-device 1066 * irq_lock 1067 */ 1068 write_lock_irq(&vcdev->irq_lock); 1069 write_unlock_irq(&vcdev->irq_lock); 1070 } 1071 } 1072 1073 static const struct virtio_config_ops virtio_ccw_config_ops = { 1074 .get_features = virtio_ccw_get_features, 1075 .finalize_features = virtio_ccw_finalize_features, 1076 .get = virtio_ccw_get_config, 1077 .set = virtio_ccw_set_config, 1078 .get_status = virtio_ccw_get_status, 1079 .set_status = virtio_ccw_set_status, 1080 .reset = virtio_ccw_reset, 1081 .find_vqs = virtio_ccw_find_vqs, 1082 .del_vqs = virtio_ccw_del_vqs, 1083 .bus_name = virtio_ccw_bus_name, 1084 .synchronize_cbs = virtio_ccw_synchronize_cbs, 1085 }; 1086 1087 1088 /* 1089 * ccw bus driver related functions 1090 */ 1091 1092 static void virtio_ccw_release_dev(struct device *_d) 1093 { 1094 struct virtio_device *dev = dev_to_virtio(_d); 1095 struct virtio_ccw_device *vcdev = to_vc_device(dev); 1096 1097 ccw_device_dma_free(vcdev->cdev, vcdev->dma_area, 1098 sizeof(*vcdev->dma_area)); 1099 kfree(vcdev); 1100 } 1101 1102 static int irb_is_error(struct irb *irb) 1103 { 1104 if (scsw_cstat(&irb->scsw) != 0) 1105 return 1; 1106 if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) 1107 return 1; 1108 if (scsw_cc(&irb->scsw) != 0) 1109 return 1; 1110 return 0; 1111 } 1112 1113 static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev, 1114 int index) 1115 { 1116 struct virtio_ccw_vq_info *info; 1117 unsigned long flags; 1118 struct virtqueue *vq; 1119 1120 vq = NULL; 1121 spin_lock_irqsave(&vcdev->lock, flags); 1122 list_for_each_entry(info, &vcdev->virtqueues, node) { 1123 if (info->vq->index == index) { 1124 vq = info->vq; 1125 break; 1126 } 1127 } 1128 spin_unlock_irqrestore(&vcdev->lock, flags); 1129 return vq; 1130 } 1131 1132 static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev, 1133 __u32 activity) 1134 { 1135 if (vcdev->curr_io & activity) { 1136 switch (activity) { 1137 case VIRTIO_CCW_DOING_READ_FEAT: 1138 case VIRTIO_CCW_DOING_WRITE_FEAT: 1139 case VIRTIO_CCW_DOING_READ_CONFIG: 1140 case VIRTIO_CCW_DOING_WRITE_CONFIG: 1141 case VIRTIO_CCW_DOING_WRITE_STATUS: 1142 case VIRTIO_CCW_DOING_READ_STATUS: 1143 case VIRTIO_CCW_DOING_SET_VQ: 1144 case VIRTIO_CCW_DOING_SET_IND: 1145 case VIRTIO_CCW_DOING_SET_CONF_IND: 1146 case VIRTIO_CCW_DOING_RESET: 1147 case VIRTIO_CCW_DOING_READ_VQ_CONF: 1148 case VIRTIO_CCW_DOING_SET_IND_ADAPTER: 1149 case VIRTIO_CCW_DOING_SET_VIRTIO_REV: 1150 vcdev->curr_io &= ~activity; 1151 wake_up(&vcdev->wait_q); 1152 break; 1153 default: 1154 /* don't know what to do... */ 1155 dev_warn(&vcdev->cdev->dev, 1156 "Suspicious activity '%08x'\n", activity); 1157 WARN_ON(1); 1158 break; 1159 } 1160 } 1161 } 1162 1163 static void virtio_ccw_int_handler(struct ccw_device *cdev, 1164 unsigned long intparm, 1165 struct irb *irb) 1166 { 1167 __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK; 1168 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1169 int i; 1170 struct virtqueue *vq; 1171 1172 if (!vcdev) 1173 return; 1174 if (IS_ERR(irb)) { 1175 vcdev->err = PTR_ERR(irb); 1176 virtio_ccw_check_activity(vcdev, activity); 1177 /* Don't poke around indicators, something's wrong. */ 1178 return; 1179 } 1180 /* Check if it's a notification from the host. */ 1181 if ((intparm == 0) && 1182 (scsw_stctl(&irb->scsw) == 1183 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) { 1184 /* OK */ 1185 } 1186 if (irb_is_error(irb)) { 1187 /* Command reject? */ 1188 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) && 1189 (irb->ecw[0] & SNS0_CMD_REJECT)) 1190 vcdev->err = -EOPNOTSUPP; 1191 else 1192 /* Map everything else to -EIO. */ 1193 vcdev->err = -EIO; 1194 } 1195 virtio_ccw_check_activity(vcdev, activity); 1196 #ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION 1197 /* 1198 * Paired with virtio_ccw_synchronize_cbs() and interrupts are 1199 * disabled here. 1200 */ 1201 read_lock(&vcdev->irq_lock); 1202 #endif 1203 for_each_set_bit(i, indicators(vcdev), 1204 sizeof(*indicators(vcdev)) * BITS_PER_BYTE) { 1205 /* The bit clear must happen before the vring kick. */ 1206 clear_bit(i, indicators(vcdev)); 1207 barrier(); 1208 vq = virtio_ccw_vq_by_ind(vcdev, i); 1209 vring_interrupt(0, vq); 1210 } 1211 #ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION 1212 read_unlock(&vcdev->irq_lock); 1213 #endif 1214 if (test_bit(0, indicators2(vcdev))) { 1215 virtio_config_changed(&vcdev->vdev); 1216 clear_bit(0, indicators2(vcdev)); 1217 } 1218 } 1219 1220 /* 1221 * We usually want to autoonline all devices, but give the admin 1222 * a way to exempt devices from this. 1223 */ 1224 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ 1225 (8*sizeof(long))) 1226 static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS]; 1227 1228 static char *no_auto = ""; 1229 1230 module_param(no_auto, charp, 0444); 1231 MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined"); 1232 1233 static int virtio_ccw_check_autoonline(struct ccw_device *cdev) 1234 { 1235 struct ccw_dev_id id; 1236 1237 ccw_device_get_id(cdev, &id); 1238 if (test_bit(id.devno, devs_no_auto[id.ssid])) 1239 return 0; 1240 return 1; 1241 } 1242 1243 static void virtio_ccw_auto_online(void *data, async_cookie_t cookie) 1244 { 1245 struct ccw_device *cdev = data; 1246 int ret; 1247 1248 ret = ccw_device_set_online(cdev); 1249 if (ret) 1250 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret); 1251 } 1252 1253 static int virtio_ccw_probe(struct ccw_device *cdev) 1254 { 1255 cdev->handler = virtio_ccw_int_handler; 1256 1257 if (virtio_ccw_check_autoonline(cdev)) 1258 async_schedule(virtio_ccw_auto_online, cdev); 1259 return 0; 1260 } 1261 1262 static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev) 1263 { 1264 unsigned long flags; 1265 struct virtio_ccw_device *vcdev; 1266 1267 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1268 vcdev = dev_get_drvdata(&cdev->dev); 1269 if (!vcdev || vcdev->going_away) { 1270 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1271 return NULL; 1272 } 1273 vcdev->going_away = true; 1274 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1275 return vcdev; 1276 } 1277 1278 static void virtio_ccw_remove(struct ccw_device *cdev) 1279 { 1280 unsigned long flags; 1281 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1282 1283 if (vcdev && cdev->online) { 1284 if (vcdev->device_lost) 1285 virtio_break_device(&vcdev->vdev); 1286 unregister_virtio_device(&vcdev->vdev); 1287 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1288 dev_set_drvdata(&cdev->dev, NULL); 1289 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1290 } 1291 cdev->handler = NULL; 1292 } 1293 1294 static int virtio_ccw_offline(struct ccw_device *cdev) 1295 { 1296 unsigned long flags; 1297 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1298 1299 if (!vcdev) 1300 return 0; 1301 if (vcdev->device_lost) 1302 virtio_break_device(&vcdev->vdev); 1303 unregister_virtio_device(&vcdev->vdev); 1304 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1305 dev_set_drvdata(&cdev->dev, NULL); 1306 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1307 return 0; 1308 } 1309 1310 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev) 1311 { 1312 struct virtio_rev_info *rev; 1313 struct ccw1 *ccw; 1314 int ret; 1315 1316 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 1317 if (!ccw) 1318 return -ENOMEM; 1319 rev = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*rev), &ccw->cda); 1320 if (!rev) { 1321 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 1322 return -ENOMEM; 1323 } 1324 1325 /* Set transport revision */ 1326 ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV; 1327 ccw->flags = 0; 1328 ccw->count = sizeof(*rev); 1329 1330 vcdev->revision = VIRTIO_CCW_REV_MAX; 1331 do { 1332 rev->revision = vcdev->revision; 1333 /* none of our supported revisions carry payload */ 1334 rev->length = 0; 1335 ret = ccw_io_helper(vcdev, ccw, 1336 VIRTIO_CCW_DOING_SET_VIRTIO_REV); 1337 if (ret == -EOPNOTSUPP) { 1338 if (vcdev->revision == 0) 1339 /* 1340 * The host device does not support setting 1341 * the revision: let's operate it in legacy 1342 * mode. 1343 */ 1344 ret = 0; 1345 else 1346 vcdev->revision--; 1347 } 1348 } while (ret == -EOPNOTSUPP); 1349 1350 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 1351 ccw_device_dma_free(vcdev->cdev, rev, sizeof(*rev)); 1352 return ret; 1353 } 1354 1355 static int virtio_ccw_online(struct ccw_device *cdev) 1356 { 1357 int ret; 1358 struct virtio_ccw_device *vcdev; 1359 unsigned long flags; 1360 1361 vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL); 1362 if (!vcdev) { 1363 dev_warn(&cdev->dev, "Could not get memory for virtio\n"); 1364 ret = -ENOMEM; 1365 goto out_free; 1366 } 1367 vcdev->vdev.dev.parent = &cdev->dev; 1368 vcdev->cdev = cdev; 1369 vcdev->dma_area = ccw_device_dma_zalloc(vcdev->cdev, 1370 sizeof(*vcdev->dma_area), 1371 &vcdev->dma_area_addr); 1372 if (!vcdev->dma_area) { 1373 ret = -ENOMEM; 1374 goto out_free; 1375 } 1376 1377 vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */ 1378 1379 vcdev->vdev.dev.release = virtio_ccw_release_dev; 1380 vcdev->vdev.config = &virtio_ccw_config_ops; 1381 init_waitqueue_head(&vcdev->wait_q); 1382 INIT_LIST_HEAD(&vcdev->virtqueues); 1383 spin_lock_init(&vcdev->lock); 1384 rwlock_init(&vcdev->irq_lock); 1385 mutex_init(&vcdev->io_lock); 1386 1387 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1388 dev_set_drvdata(&cdev->dev, vcdev); 1389 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1390 vcdev->vdev.id.vendor = cdev->id.cu_type; 1391 vcdev->vdev.id.device = cdev->id.cu_model; 1392 1393 ret = virtio_ccw_set_transport_rev(vcdev); 1394 if (ret) 1395 goto out_free; 1396 1397 ret = register_virtio_device(&vcdev->vdev); 1398 if (ret) { 1399 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n", 1400 ret); 1401 goto out_put; 1402 } 1403 return 0; 1404 out_put: 1405 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1406 dev_set_drvdata(&cdev->dev, NULL); 1407 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1408 put_device(&vcdev->vdev.dev); 1409 return ret; 1410 out_free: 1411 if (vcdev) { 1412 ccw_device_dma_free(vcdev->cdev, vcdev->dma_area, 1413 sizeof(*vcdev->dma_area)); 1414 } 1415 kfree(vcdev); 1416 return ret; 1417 } 1418 1419 static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event) 1420 { 1421 int rc; 1422 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1423 1424 /* 1425 * Make sure vcdev is set 1426 * i.e. set_offline/remove callback not already running 1427 */ 1428 if (!vcdev) 1429 return NOTIFY_DONE; 1430 1431 switch (event) { 1432 case CIO_GONE: 1433 vcdev->device_lost = true; 1434 rc = NOTIFY_DONE; 1435 break; 1436 case CIO_OPER: 1437 rc = NOTIFY_OK; 1438 break; 1439 default: 1440 rc = NOTIFY_DONE; 1441 break; 1442 } 1443 return rc; 1444 } 1445 1446 static struct ccw_device_id virtio_ids[] = { 1447 { CCW_DEVICE(0x3832, 0) }, 1448 {}, 1449 }; 1450 1451 static struct ccw_driver virtio_ccw_driver = { 1452 .driver = { 1453 .owner = THIS_MODULE, 1454 .name = "virtio_ccw", 1455 }, 1456 .ids = virtio_ids, 1457 .probe = virtio_ccw_probe, 1458 .remove = virtio_ccw_remove, 1459 .set_offline = virtio_ccw_offline, 1460 .set_online = virtio_ccw_online, 1461 .notify = virtio_ccw_cio_notify, 1462 .int_class = IRQIO_VIR, 1463 }; 1464 1465 static int __init pure_hex(char **cp, unsigned int *val, int min_digit, 1466 int max_digit, int max_val) 1467 { 1468 int diff; 1469 1470 diff = 0; 1471 *val = 0; 1472 1473 while (diff <= max_digit) { 1474 int value = hex_to_bin(**cp); 1475 1476 if (value < 0) 1477 break; 1478 *val = *val * 16 + value; 1479 (*cp)++; 1480 diff++; 1481 } 1482 1483 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) 1484 return 1; 1485 1486 return 0; 1487 } 1488 1489 static int __init parse_busid(char *str, unsigned int *cssid, 1490 unsigned int *ssid, unsigned int *devno) 1491 { 1492 char *str_work; 1493 int rc, ret; 1494 1495 rc = 1; 1496 1497 if (*str == '\0') 1498 goto out; 1499 1500 str_work = str; 1501 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); 1502 if (ret || (str_work[0] != '.')) 1503 goto out; 1504 str_work++; 1505 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); 1506 if (ret || (str_work[0] != '.')) 1507 goto out; 1508 str_work++; 1509 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); 1510 if (ret || (str_work[0] != '\0')) 1511 goto out; 1512 1513 rc = 0; 1514 out: 1515 return rc; 1516 } 1517 1518 static void __init no_auto_parse(void) 1519 { 1520 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; 1521 char *parm, *str; 1522 int rc; 1523 1524 str = no_auto; 1525 while ((parm = strsep(&str, ","))) { 1526 rc = parse_busid(strsep(&parm, "-"), &from_cssid, 1527 &from_ssid, &from); 1528 if (rc) 1529 continue; 1530 if (parm != NULL) { 1531 rc = parse_busid(parm, &to_cssid, 1532 &to_ssid, &to); 1533 if ((from_ssid > to_ssid) || 1534 ((from_ssid == to_ssid) && (from > to))) 1535 rc = -EINVAL; 1536 } else { 1537 to_cssid = from_cssid; 1538 to_ssid = from_ssid; 1539 to = from; 1540 } 1541 if (rc) 1542 continue; 1543 while ((from_ssid < to_ssid) || 1544 ((from_ssid == to_ssid) && (from <= to))) { 1545 set_bit(from, devs_no_auto[from_ssid]); 1546 from++; 1547 if (from > __MAX_SUBCHANNEL) { 1548 from_ssid++; 1549 from = 0; 1550 } 1551 } 1552 } 1553 } 1554 1555 static int __init virtio_ccw_init(void) 1556 { 1557 int rc; 1558 1559 /* parse no_auto string before we do anything further */ 1560 no_auto_parse(); 1561 1562 summary_indicators = cio_dma_zalloc(MAX_AIRQ_AREAS); 1563 if (!summary_indicators) 1564 return -ENOMEM; 1565 rc = ccw_driver_register(&virtio_ccw_driver); 1566 if (rc) 1567 cio_dma_free(summary_indicators, MAX_AIRQ_AREAS); 1568 return rc; 1569 } 1570 device_initcall(virtio_ccw_init); 1571