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/hex.h> 12 #include <linux/init.h> 13 #include <linux/memblock.h> 14 #include <linux/err.h> 15 #include <linux/virtio.h> 16 #include <linux/virtio_config.h> 17 #include <linux/slab.h> 18 #include <linux/interrupt.h> 19 #include <linux/virtio_ring.h> 20 #include <linux/pfn.h> 21 #include <linux/async.h> 22 #include <linux/wait.h> 23 #include <linux/list.h> 24 #include <linux/bitops.h> 25 #include <linux/moduleparam.h> 26 #include <linux/io.h> 27 #include <linux/kvm_para.h> 28 #include <linux/notifier.h> 29 #include <asm/diag.h> 30 #include <asm/setup.h> 31 #include <asm/irq.h> 32 #include <asm/cio.h> 33 #include <asm/ccwdev.h> 34 #include <asm/virtio-ccw.h> 35 #include <asm/isc.h> 36 #include <asm/airq.h> 37 #include <asm/tpi.h> 38 39 /* 40 * virtio related functions 41 */ 42 43 struct vq_config_block { 44 __u16 index; 45 __u16 num; 46 } __packed; 47 48 #define VIRTIO_CCW_CONFIG_SIZE 0x100 49 /* same as PCI config space size, should be enough for all drivers */ 50 51 struct vcdev_dma_area { 52 unsigned long indicators; 53 unsigned long indicators2; 54 struct vq_config_block config_block; 55 __u8 status; 56 }; 57 58 struct virtio_ccw_device { 59 struct virtio_device vdev; 60 __u8 config[VIRTIO_CCW_CONFIG_SIZE]; 61 struct ccw_device *cdev; 62 /* we make cdev->dev.dma_parms point to this */ 63 struct device_dma_parameters dma_parms; 64 __u32 curr_io; 65 int err; 66 unsigned int revision; /* Transport revision */ 67 wait_queue_head_t wait_q; 68 spinlock_t lock; 69 rwlock_t irq_lock; 70 struct mutex io_lock; /* Serializes I/O requests */ 71 struct list_head virtqueues; 72 bool is_thinint; 73 bool going_away; 74 bool device_lost; 75 unsigned int config_ready; 76 void *airq_info; 77 struct vcdev_dma_area *dma_area; 78 dma32_t dma_area_addr; 79 }; 80 81 static inline unsigned long *indicators(struct virtio_ccw_device *vcdev) 82 { 83 return &vcdev->dma_area->indicators; 84 } 85 86 static inline unsigned long *indicators2(struct virtio_ccw_device *vcdev) 87 { 88 return &vcdev->dma_area->indicators2; 89 } 90 91 /* Spec stipulates a 64 bit address */ 92 static inline dma64_t indicators_dma(struct virtio_ccw_device *vcdev) 93 { 94 u64 dma_area_addr = dma32_to_u32(vcdev->dma_area_addr); 95 96 return dma64_add(u64_to_dma64(dma_area_addr), 97 offsetof(struct vcdev_dma_area, indicators)); 98 } 99 100 /* Spec stipulates a 64 bit address */ 101 static inline dma64_t indicators2_dma(struct virtio_ccw_device *vcdev) 102 { 103 u64 dma_area_addr = dma32_to_u32(vcdev->dma_area_addr); 104 105 return dma64_add(u64_to_dma64(dma_area_addr), 106 offsetof(struct vcdev_dma_area, indicators2)); 107 } 108 109 static inline dma32_t config_block_dma(struct virtio_ccw_device *vcdev) 110 { 111 return dma32_add(vcdev->dma_area_addr, 112 offsetof(struct vcdev_dma_area, config_block)); 113 } 114 115 static inline dma32_t status_dma(struct virtio_ccw_device *vcdev) 116 { 117 return dma32_add(vcdev->dma_area_addr, 118 offsetof(struct vcdev_dma_area, status)); 119 } 120 121 struct vq_info_block_legacy { 122 dma64_t queue; 123 __u32 align; 124 __u16 index; 125 __u16 num; 126 } __packed; 127 128 struct vq_info_block { 129 dma64_t desc; 130 __u32 res0; 131 __u16 index; 132 __u16 num; 133 dma64_t avail; 134 dma64_t used; 135 } __packed; 136 137 struct virtio_feature_desc { 138 __le32 features; 139 __u8 index; 140 } __packed; 141 142 struct virtio_thinint_area { 143 dma64_t summary_indicator; 144 dma64_t indicator; 145 u64 bit_nr; 146 u8 isc; 147 } __packed; 148 149 struct virtio_rev_info { 150 __u16 revision; 151 __u16 length; 152 __u8 data[]; 153 }; 154 155 /* the highest virtio-ccw revision we support */ 156 #define VIRTIO_CCW_REV_MAX 2 157 158 struct virtio_ccw_vq_info { 159 struct virtqueue *vq; 160 dma32_t info_block_addr; 161 int num; 162 union { 163 struct vq_info_block s; 164 struct vq_info_block_legacy l; 165 } *info_block; 166 int bit_nr; 167 struct list_head node; 168 long cookie; 169 }; 170 171 #define VIRTIO_AIRQ_ISC IO_SCH_ISC /* inherit from subchannel */ 172 173 #define VIRTIO_IV_BITS (L1_CACHE_BYTES * 8) 174 #define MAX_AIRQ_AREAS 20 175 176 static int virtio_ccw_use_airq = 1; 177 178 struct airq_info { 179 rwlock_t lock; 180 u8 summary_indicator_idx; 181 struct airq_struct airq; 182 struct airq_iv *aiv; 183 }; 184 static struct airq_info *airq_areas[MAX_AIRQ_AREAS]; 185 static DEFINE_MUTEX(airq_areas_lock); 186 187 static u8 *summary_indicators; 188 189 static inline u8 *get_summary_indicator(struct airq_info *info) 190 { 191 return summary_indicators + info->summary_indicator_idx; 192 } 193 194 static inline dma64_t get_summary_indicator_dma(struct airq_info *info) 195 { 196 return virt_to_dma64(get_summary_indicator(info)); 197 } 198 199 #define CCW_CMD_SET_VQ 0x13 200 #define CCW_CMD_VDEV_RESET 0x33 201 #define CCW_CMD_SET_IND 0x43 202 #define CCW_CMD_SET_CONF_IND 0x53 203 #define CCW_CMD_READ_FEAT 0x12 204 #define CCW_CMD_WRITE_FEAT 0x11 205 #define CCW_CMD_READ_CONF 0x22 206 #define CCW_CMD_WRITE_CONF 0x21 207 #define CCW_CMD_WRITE_STATUS 0x31 208 #define CCW_CMD_READ_VQ_CONF 0x32 209 #define CCW_CMD_READ_STATUS 0x72 210 #define CCW_CMD_SET_IND_ADAPTER 0x73 211 #define CCW_CMD_SET_VIRTIO_REV 0x83 212 213 #define VIRTIO_CCW_DOING_SET_VQ 0x00010000 214 #define VIRTIO_CCW_DOING_RESET 0x00040000 215 #define VIRTIO_CCW_DOING_READ_FEAT 0x00080000 216 #define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000 217 #define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000 218 #define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000 219 #define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000 220 #define VIRTIO_CCW_DOING_SET_IND 0x01000000 221 #define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000 222 #define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000 223 #define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000 224 #define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000 225 #define VIRTIO_CCW_DOING_READ_STATUS 0x20000000 226 #define VIRTIO_CCW_INTPARM_MASK 0xffff0000 227 228 static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev) 229 { 230 return container_of(vdev, struct virtio_ccw_device, vdev); 231 } 232 233 static void drop_airq_indicator(struct virtqueue *vq, struct airq_info *info) 234 { 235 unsigned long i, flags; 236 237 write_lock_irqsave(&info->lock, flags); 238 for (i = 0; i < airq_iv_end(info->aiv); i++) { 239 if (vq == (void *)airq_iv_get_ptr(info->aiv, i)) { 240 airq_iv_free_bit(info->aiv, i); 241 airq_iv_set_ptr(info->aiv, i, 0); 242 break; 243 } 244 } 245 write_unlock_irqrestore(&info->lock, flags); 246 } 247 248 static void virtio_airq_handler(struct airq_struct *airq, 249 struct tpi_info *tpi_info) 250 { 251 struct airq_info *info = container_of(airq, struct airq_info, airq); 252 unsigned long ai; 253 254 inc_irq_stat(IRQIO_VAI); 255 read_lock(&info->lock); 256 /* Walk through indicators field, summary indicator active. */ 257 for (ai = 0;;) { 258 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv)); 259 if (ai == -1UL) 260 break; 261 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai)); 262 } 263 *(get_summary_indicator(info)) = 0; 264 smp_wmb(); 265 /* Walk through indicators field, summary indicator not active. */ 266 for (ai = 0;;) { 267 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv)); 268 if (ai == -1UL) 269 break; 270 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai)); 271 } 272 read_unlock(&info->lock); 273 } 274 275 static struct airq_info *new_airq_info(int index) 276 { 277 struct airq_info *info; 278 int rc; 279 280 info = kzalloc(sizeof(*info), GFP_KERNEL); 281 if (!info) 282 return NULL; 283 rwlock_init(&info->lock); 284 info->aiv = airq_iv_create(VIRTIO_IV_BITS, AIRQ_IV_ALLOC | AIRQ_IV_PTR 285 | AIRQ_IV_CACHELINE, NULL); 286 if (!info->aiv) { 287 kfree(info); 288 return NULL; 289 } 290 info->airq.handler = virtio_airq_handler; 291 info->summary_indicator_idx = index; 292 info->airq.lsi_ptr = get_summary_indicator(info); 293 info->airq.isc = VIRTIO_AIRQ_ISC; 294 rc = register_adapter_interrupt(&info->airq); 295 if (rc) { 296 airq_iv_release(info->aiv); 297 kfree(info); 298 return NULL; 299 } 300 return info; 301 } 302 303 static unsigned long *get_airq_indicator(struct virtqueue *vqs[], int nvqs, 304 u64 *first, void **airq_info) 305 { 306 int i, j, queue_idx, highest_queue_idx = -1; 307 struct airq_info *info; 308 unsigned long *indicator_addr = NULL; 309 unsigned long bit, flags; 310 311 /* Array entries without an actual queue pointer must be ignored. */ 312 for (i = 0; i < nvqs; i++) { 313 if (vqs[i]) 314 highest_queue_idx++; 315 } 316 317 for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) { 318 mutex_lock(&airq_areas_lock); 319 if (!airq_areas[i]) 320 airq_areas[i] = new_airq_info(i); 321 info = airq_areas[i]; 322 mutex_unlock(&airq_areas_lock); 323 if (!info) 324 return NULL; 325 write_lock_irqsave(&info->lock, flags); 326 bit = airq_iv_alloc(info->aiv, highest_queue_idx + 1); 327 if (bit == -1UL) { 328 /* Not enough vacancies. */ 329 write_unlock_irqrestore(&info->lock, flags); 330 continue; 331 } 332 *first = bit; 333 *airq_info = info; 334 indicator_addr = info->aiv->vector; 335 for (j = 0, queue_idx = 0; j < nvqs; j++) { 336 if (!vqs[j]) 337 continue; 338 airq_iv_set_ptr(info->aiv, bit + queue_idx++, 339 (unsigned long)vqs[j]); 340 } 341 write_unlock_irqrestore(&info->lock, flags); 342 } 343 return indicator_addr; 344 } 345 346 static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev) 347 { 348 struct virtio_ccw_vq_info *info; 349 350 if (!vcdev->airq_info) 351 return; 352 list_for_each_entry(info, &vcdev->virtqueues, node) 353 drop_airq_indicator(info->vq, vcdev->airq_info); 354 } 355 356 static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag) 357 { 358 unsigned long flags; 359 __u32 ret; 360 361 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); 362 if (vcdev->err) 363 ret = 0; 364 else 365 ret = vcdev->curr_io & flag; 366 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); 367 return ret; 368 } 369 370 static int ccw_io_helper(struct virtio_ccw_device *vcdev, 371 struct ccw1 *ccw, __u32 intparm) 372 { 373 int ret; 374 unsigned long flags; 375 int flag = intparm & VIRTIO_CCW_INTPARM_MASK; 376 377 mutex_lock(&vcdev->io_lock); 378 do { 379 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); 380 ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0); 381 if (!ret) { 382 if (!vcdev->curr_io) 383 vcdev->err = 0; 384 vcdev->curr_io |= flag; 385 } 386 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); 387 cpu_relax(); 388 } while (ret == -EBUSY); 389 wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0); 390 ret = ret ? ret : vcdev->err; 391 mutex_unlock(&vcdev->io_lock); 392 return ret; 393 } 394 395 static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev, 396 struct ccw1 *ccw) 397 { 398 int ret; 399 struct virtio_thinint_area *thinint_area = NULL; 400 struct airq_info *airq_info = vcdev->airq_info; 401 dma64_t *indicatorp = NULL; 402 403 if (vcdev->is_thinint) { 404 thinint_area = ccw_device_dma_zalloc(vcdev->cdev, 405 sizeof(*thinint_area), 406 &ccw->cda); 407 if (!thinint_area) 408 return; 409 thinint_area->summary_indicator = 410 get_summary_indicator_dma(airq_info); 411 thinint_area->isc = VIRTIO_AIRQ_ISC; 412 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; 413 ccw->count = sizeof(*thinint_area); 414 } else { 415 /* payload is the address of the indicators */ 416 indicatorp = ccw_device_dma_zalloc(vcdev->cdev, 417 sizeof(*indicatorp), 418 &ccw->cda); 419 if (!indicatorp) 420 return; 421 *indicatorp = 0; 422 ccw->cmd_code = CCW_CMD_SET_IND; 423 ccw->count = sizeof(*indicatorp); 424 } 425 /* Deregister indicators from host. */ 426 *indicators(vcdev) = 0; 427 ccw->flags = 0; 428 ret = ccw_io_helper(vcdev, ccw, 429 vcdev->is_thinint ? 430 VIRTIO_CCW_DOING_SET_IND_ADAPTER : 431 VIRTIO_CCW_DOING_SET_IND); 432 if (ret && (ret != -ENODEV)) 433 dev_info(&vcdev->cdev->dev, 434 "Failed to deregister indicators (%d)\n", ret); 435 else if (vcdev->is_thinint) 436 virtio_ccw_drop_indicators(vcdev); 437 ccw_device_dma_free(vcdev->cdev, indicatorp, sizeof(*indicatorp)); 438 ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area)); 439 } 440 441 static inline bool virtio_ccw_do_kvm_notify(struct virtqueue *vq, u32 data) 442 { 443 struct virtio_ccw_vq_info *info = vq->priv; 444 struct virtio_ccw_device *vcdev; 445 struct subchannel_id schid; 446 447 vcdev = to_vc_device(info->vq->vdev); 448 ccw_device_get_schid(vcdev->cdev, &schid); 449 BUILD_BUG_ON(sizeof(struct subchannel_id) != sizeof(unsigned int)); 450 info->cookie = kvm_hypercall3(KVM_S390_VIRTIO_CCW_NOTIFY, 451 *((unsigned int *)&schid), 452 data, info->cookie); 453 if (info->cookie < 0) 454 return false; 455 return true; 456 } 457 458 static bool virtio_ccw_kvm_notify(struct virtqueue *vq) 459 { 460 return virtio_ccw_do_kvm_notify(vq, vq->index); 461 } 462 463 static bool virtio_ccw_kvm_notify_with_data(struct virtqueue *vq) 464 { 465 return virtio_ccw_do_kvm_notify(vq, vring_notification_data(vq)); 466 } 467 468 static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev, 469 struct ccw1 *ccw, int index) 470 { 471 int ret; 472 473 vcdev->dma_area->config_block.index = index; 474 ccw->cmd_code = CCW_CMD_READ_VQ_CONF; 475 ccw->flags = 0; 476 ccw->count = sizeof(struct vq_config_block); 477 ccw->cda = config_block_dma(vcdev); 478 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF); 479 if (ret) 480 return ret; 481 return vcdev->dma_area->config_block.num ?: -ENOENT; 482 } 483 484 static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw) 485 { 486 struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev); 487 struct virtio_ccw_vq_info *info = vq->priv; 488 unsigned long flags; 489 int ret; 490 unsigned int index = vq->index; 491 492 /* Remove from our list. */ 493 spin_lock_irqsave(&vcdev->lock, flags); 494 list_del(&info->node); 495 spin_unlock_irqrestore(&vcdev->lock, flags); 496 497 /* Release from host. */ 498 if (vcdev->revision == 0) { 499 info->info_block->l.queue = 0; 500 info->info_block->l.align = 0; 501 info->info_block->l.index = index; 502 info->info_block->l.num = 0; 503 ccw->count = sizeof(info->info_block->l); 504 } else { 505 info->info_block->s.desc = 0; 506 info->info_block->s.index = index; 507 info->info_block->s.num = 0; 508 info->info_block->s.avail = 0; 509 info->info_block->s.used = 0; 510 ccw->count = sizeof(info->info_block->s); 511 } 512 ccw->cmd_code = CCW_CMD_SET_VQ; 513 ccw->flags = 0; 514 ccw->cda = info->info_block_addr; 515 ret = ccw_io_helper(vcdev, ccw, 516 VIRTIO_CCW_DOING_SET_VQ | index); 517 /* 518 * -ENODEV isn't considered an error: The device is gone anyway. 519 * This may happen on device detach. 520 */ 521 if (ret && (ret != -ENODEV)) 522 dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d\n", 523 ret, index); 524 525 vring_del_virtqueue(vq); 526 ccw_device_dma_free(vcdev->cdev, info->info_block, 527 sizeof(*info->info_block)); 528 kfree(info); 529 } 530 531 static void virtio_ccw_del_vqs(struct virtio_device *vdev) 532 { 533 struct virtqueue *vq, *n; 534 struct ccw1 *ccw; 535 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 536 537 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 538 if (!ccw) 539 return; 540 541 virtio_ccw_drop_indicator(vcdev, ccw); 542 543 list_for_each_entry_safe(vq, n, &vdev->vqs, list) 544 virtio_ccw_del_vq(vq, ccw); 545 546 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 547 } 548 549 static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev, 550 int i, vq_callback_t *callback, 551 const char *name, bool ctx, 552 struct ccw1 *ccw) 553 { 554 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 555 bool (*notify)(struct virtqueue *vq); 556 int err; 557 struct virtqueue *vq = NULL; 558 struct virtio_ccw_vq_info *info; 559 u64 queue; 560 unsigned long flags; 561 bool may_reduce; 562 563 if (__virtio_test_bit(vdev, VIRTIO_F_NOTIFICATION_DATA)) 564 notify = virtio_ccw_kvm_notify_with_data; 565 else 566 notify = virtio_ccw_kvm_notify; 567 568 /* Allocate queue. */ 569 info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL); 570 if (!info) { 571 dev_warn(&vcdev->cdev->dev, "no info\n"); 572 err = -ENOMEM; 573 goto out_err; 574 } 575 info->info_block = ccw_device_dma_zalloc(vcdev->cdev, 576 sizeof(*info->info_block), 577 &info->info_block_addr); 578 if (!info->info_block) { 579 dev_warn(&vcdev->cdev->dev, "no info block\n"); 580 err = -ENOMEM; 581 goto out_err; 582 } 583 info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i); 584 if (info->num < 0) { 585 err = info->num; 586 goto out_err; 587 } 588 may_reduce = vcdev->revision > 0; 589 vq = vring_create_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, 590 vdev, true, may_reduce, ctx, 591 notify, callback, name); 592 593 if (!vq) { 594 /* For now, we fail if we can't get the requested size. */ 595 dev_warn(&vcdev->cdev->dev, "no vq\n"); 596 err = -ENOMEM; 597 goto out_err; 598 } 599 600 vq->num_max = info->num; 601 602 /* it may have been reduced */ 603 info->num = virtqueue_get_vring_size(vq); 604 605 /* Register it with the host. */ 606 queue = virtqueue_get_desc_addr(vq); 607 if (vcdev->revision == 0) { 608 info->info_block->l.queue = u64_to_dma64(queue); 609 info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN; 610 info->info_block->l.index = i; 611 info->info_block->l.num = info->num; 612 ccw->count = sizeof(info->info_block->l); 613 } else { 614 info->info_block->s.desc = u64_to_dma64(queue); 615 info->info_block->s.index = i; 616 info->info_block->s.num = info->num; 617 info->info_block->s.avail = u64_to_dma64(virtqueue_get_avail_addr(vq)); 618 info->info_block->s.used = u64_to_dma64(virtqueue_get_used_addr(vq)); 619 ccw->count = sizeof(info->info_block->s); 620 } 621 ccw->cmd_code = CCW_CMD_SET_VQ; 622 ccw->flags = 0; 623 ccw->cda = info->info_block_addr; 624 err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i); 625 if (err) { 626 dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n"); 627 goto out_err; 628 } 629 630 info->vq = vq; 631 vq->priv = info; 632 633 /* Save it to our list. */ 634 spin_lock_irqsave(&vcdev->lock, flags); 635 list_add(&info->node, &vcdev->virtqueues); 636 spin_unlock_irqrestore(&vcdev->lock, flags); 637 638 return vq; 639 640 out_err: 641 if (vq) 642 vring_del_virtqueue(vq); 643 if (info) { 644 ccw_device_dma_free(vcdev->cdev, info->info_block, 645 sizeof(*info->info_block)); 646 } 647 kfree(info); 648 return ERR_PTR(err); 649 } 650 651 static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev, 652 struct virtqueue *vqs[], int nvqs, 653 struct ccw1 *ccw) 654 { 655 int ret; 656 struct virtio_thinint_area *thinint_area = NULL; 657 unsigned long *indicator_addr; 658 struct airq_info *info; 659 660 thinint_area = ccw_device_dma_zalloc(vcdev->cdev, 661 sizeof(*thinint_area), 662 &ccw->cda); 663 if (!thinint_area) { 664 ret = -ENOMEM; 665 goto out; 666 } 667 /* Try to get an indicator. */ 668 indicator_addr = get_airq_indicator(vqs, nvqs, 669 &thinint_area->bit_nr, 670 &vcdev->airq_info); 671 if (!indicator_addr) { 672 ret = -ENOSPC; 673 goto out; 674 } 675 thinint_area->indicator = virt_to_dma64(indicator_addr); 676 info = vcdev->airq_info; 677 thinint_area->summary_indicator = get_summary_indicator_dma(info); 678 thinint_area->isc = VIRTIO_AIRQ_ISC; 679 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; 680 ccw->flags = CCW_FLAG_SLI; 681 ccw->count = sizeof(*thinint_area); 682 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER); 683 if (ret) { 684 if (ret == -EOPNOTSUPP) { 685 /* 686 * The host does not support adapter interrupts 687 * for virtio-ccw, stop trying. 688 */ 689 virtio_ccw_use_airq = 0; 690 pr_info("Adapter interrupts unsupported on host\n"); 691 } else 692 dev_warn(&vcdev->cdev->dev, 693 "enabling adapter interrupts = %d\n", ret); 694 virtio_ccw_drop_indicators(vcdev); 695 } 696 out: 697 ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area)); 698 return ret; 699 } 700 701 static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, 702 struct virtqueue *vqs[], 703 struct virtqueue_info vqs_info[], 704 struct irq_affinity *desc) 705 { 706 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 707 dma64_t *indicatorp = NULL; 708 int ret, i, queue_idx = 0; 709 struct ccw1 *ccw; 710 dma32_t indicatorp_dma = 0; 711 712 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 713 if (!ccw) 714 return -ENOMEM; 715 716 for (i = 0; i < nvqs; ++i) { 717 struct virtqueue_info *vqi = &vqs_info[i]; 718 719 if (!vqi->name) { 720 vqs[i] = NULL; 721 continue; 722 } 723 724 vqs[i] = virtio_ccw_setup_vq(vdev, queue_idx++, vqi->callback, 725 vqi->name, vqi->ctx, ccw); 726 if (IS_ERR(vqs[i])) { 727 ret = PTR_ERR(vqs[i]); 728 vqs[i] = NULL; 729 goto out; 730 } 731 } 732 ret = -ENOMEM; 733 /* 734 * We need a data area under 2G to communicate. Our payload is 735 * the address of the indicators. 736 */ 737 indicatorp = ccw_device_dma_zalloc(vcdev->cdev, 738 sizeof(*indicatorp), 739 &indicatorp_dma); 740 if (!indicatorp) 741 goto out; 742 *indicatorp = indicators_dma(vcdev); 743 if (vcdev->is_thinint) { 744 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw); 745 if (ret) 746 /* no error, just fall back to legacy interrupts */ 747 vcdev->is_thinint = false; 748 } 749 ccw->cda = indicatorp_dma; 750 if (!vcdev->is_thinint) { 751 /* Register queue indicators with host. */ 752 *indicators(vcdev) = 0; 753 ccw->cmd_code = CCW_CMD_SET_IND; 754 ccw->flags = 0; 755 ccw->count = sizeof(*indicatorp); 756 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND); 757 if (ret) 758 goto out; 759 } 760 /* Register indicators2 with host for config changes */ 761 *indicatorp = indicators2_dma(vcdev); 762 *indicators2(vcdev) = 0; 763 ccw->cmd_code = CCW_CMD_SET_CONF_IND; 764 ccw->flags = 0; 765 ccw->count = sizeof(*indicatorp); 766 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND); 767 if (ret) 768 goto out; 769 770 if (indicatorp) 771 ccw_device_dma_free(vcdev->cdev, indicatorp, 772 sizeof(*indicatorp)); 773 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 774 return 0; 775 out: 776 if (indicatorp) 777 ccw_device_dma_free(vcdev->cdev, indicatorp, 778 sizeof(*indicatorp)); 779 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 780 virtio_ccw_del_vqs(vdev); 781 return ret; 782 } 783 784 static void virtio_ccw_reset(struct virtio_device *vdev) 785 { 786 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 787 struct ccw1 *ccw; 788 789 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 790 if (!ccw) 791 return; 792 793 /* Zero status bits. */ 794 vcdev->dma_area->status = 0; 795 796 /* Send a reset ccw on device. */ 797 ccw->cmd_code = CCW_CMD_VDEV_RESET; 798 ccw->flags = 0; 799 ccw->count = 0; 800 ccw->cda = 0; 801 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET); 802 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 803 } 804 805 static u64 virtio_ccw_get_features(struct virtio_device *vdev) 806 { 807 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 808 struct virtio_feature_desc *features; 809 int ret; 810 u64 rc; 811 struct ccw1 *ccw; 812 813 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 814 if (!ccw) 815 return 0; 816 817 features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features), 818 &ccw->cda); 819 if (!features) { 820 rc = 0; 821 goto out_free; 822 } 823 /* Read the feature bits from the host. */ 824 features->index = 0; 825 ccw->cmd_code = CCW_CMD_READ_FEAT; 826 ccw->flags = 0; 827 ccw->count = sizeof(*features); 828 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 829 if (ret) { 830 rc = 0; 831 goto out_free; 832 } 833 834 rc = le32_to_cpu(features->features); 835 836 if (vcdev->revision == 0) 837 goto out_free; 838 839 /* Read second half of the feature bits from the host. */ 840 features->index = 1; 841 ccw->cmd_code = CCW_CMD_READ_FEAT; 842 ccw->flags = 0; 843 ccw->count = sizeof(*features); 844 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 845 if (ret == 0) 846 rc |= (u64)le32_to_cpu(features->features) << 32; 847 848 out_free: 849 ccw_device_dma_free(vcdev->cdev, features, sizeof(*features)); 850 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 851 return rc; 852 } 853 854 static void ccw_transport_features(struct virtio_device *vdev) 855 { 856 /* 857 * Currently nothing to do here. 858 */ 859 } 860 861 static int virtio_ccw_finalize_features(struct virtio_device *vdev) 862 { 863 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 864 struct virtio_feature_desc *features; 865 struct ccw1 *ccw; 866 int ret; 867 868 if (vcdev->revision >= 1 && 869 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { 870 dev_err(&vdev->dev, "virtio: device uses revision 1 " 871 "but does not have VIRTIO_F_VERSION_1\n"); 872 return -EINVAL; 873 } 874 875 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 876 if (!ccw) 877 return -ENOMEM; 878 879 features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features), 880 &ccw->cda); 881 if (!features) { 882 ret = -ENOMEM; 883 goto out_free; 884 } 885 /* Give virtio_ring a chance to accept features. */ 886 vring_transport_features(vdev); 887 888 /* Give virtio_ccw a chance to accept features. */ 889 ccw_transport_features(vdev); 890 891 features->index = 0; 892 features->features = cpu_to_le32((u32)vdev->features); 893 /* Write the first half of the feature bits to the host. */ 894 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 895 ccw->flags = 0; 896 ccw->count = sizeof(*features); 897 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 898 if (ret) 899 goto out_free; 900 901 if (vcdev->revision == 0) 902 goto out_free; 903 904 features->index = 1; 905 features->features = cpu_to_le32(vdev->features >> 32); 906 /* Write the second half of the feature bits to the host. */ 907 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 908 ccw->flags = 0; 909 ccw->count = sizeof(*features); 910 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 911 912 out_free: 913 ccw_device_dma_free(vcdev->cdev, features, sizeof(*features)); 914 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 915 916 return ret; 917 } 918 919 static void virtio_ccw_get_config(struct virtio_device *vdev, 920 unsigned int offset, void *buf, unsigned len) 921 { 922 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 923 int ret; 924 struct ccw1 *ccw; 925 void *config_area; 926 unsigned long flags; 927 928 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 929 if (!ccw) 930 return; 931 932 config_area = ccw_device_dma_zalloc(vcdev->cdev, 933 VIRTIO_CCW_CONFIG_SIZE, 934 &ccw->cda); 935 if (!config_area) 936 goto out_free; 937 938 /* Read the config area from the host. */ 939 ccw->cmd_code = CCW_CMD_READ_CONF; 940 ccw->flags = 0; 941 ccw->count = offset + len; 942 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG); 943 if (ret) 944 goto out_free; 945 946 spin_lock_irqsave(&vcdev->lock, flags); 947 memcpy(vcdev->config, config_area, offset + len); 948 if (vcdev->config_ready < offset + len) 949 vcdev->config_ready = offset + len; 950 spin_unlock_irqrestore(&vcdev->lock, flags); 951 if (buf) 952 memcpy(buf, config_area + offset, len); 953 954 out_free: 955 ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE); 956 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 957 } 958 959 static void virtio_ccw_set_config(struct virtio_device *vdev, 960 unsigned int offset, const void *buf, 961 unsigned len) 962 { 963 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 964 struct ccw1 *ccw; 965 void *config_area; 966 unsigned long flags; 967 968 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 969 if (!ccw) 970 return; 971 972 config_area = ccw_device_dma_zalloc(vcdev->cdev, 973 VIRTIO_CCW_CONFIG_SIZE, 974 &ccw->cda); 975 if (!config_area) 976 goto out_free; 977 978 /* Make sure we don't overwrite fields. */ 979 if (vcdev->config_ready < offset) 980 virtio_ccw_get_config(vdev, 0, NULL, offset); 981 spin_lock_irqsave(&vcdev->lock, flags); 982 memcpy(&vcdev->config[offset], buf, len); 983 /* Write the config area to the host. */ 984 memcpy(config_area, vcdev->config, sizeof(vcdev->config)); 985 spin_unlock_irqrestore(&vcdev->lock, flags); 986 ccw->cmd_code = CCW_CMD_WRITE_CONF; 987 ccw->flags = 0; 988 ccw->count = offset + len; 989 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG); 990 991 out_free: 992 ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE); 993 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 994 } 995 996 static u8 virtio_ccw_get_status(struct virtio_device *vdev) 997 { 998 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 999 u8 old_status = vcdev->dma_area->status; 1000 struct ccw1 *ccw; 1001 1002 if (vcdev->revision < 2) 1003 return vcdev->dma_area->status; 1004 1005 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 1006 if (!ccw) 1007 return old_status; 1008 1009 ccw->cmd_code = CCW_CMD_READ_STATUS; 1010 ccw->flags = 0; 1011 ccw->count = sizeof(vcdev->dma_area->status); 1012 ccw->cda = status_dma(vcdev); 1013 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS); 1014 /* 1015 * If the channel program failed (should only happen if the device 1016 * was hotunplugged, and then we clean up via the machine check 1017 * handler anyway), vcdev->dma_area->status was not overwritten and we just 1018 * return the old status, which is fine. 1019 */ 1020 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 1021 1022 return vcdev->dma_area->status; 1023 } 1024 1025 static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status) 1026 { 1027 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 1028 u8 old_status = vcdev->dma_area->status; 1029 struct ccw1 *ccw; 1030 int ret; 1031 1032 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 1033 if (!ccw) 1034 return; 1035 1036 /* Write the status to the host. */ 1037 vcdev->dma_area->status = status; 1038 ccw->cmd_code = CCW_CMD_WRITE_STATUS; 1039 ccw->flags = 0; 1040 ccw->count = sizeof(status); 1041 /* We use ssch for setting the status which is a serializing 1042 * instruction that guarantees the memory writes have 1043 * completed before ssch. 1044 */ 1045 ccw->cda = status_dma(vcdev); 1046 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS); 1047 /* Write failed? We assume status is unchanged. */ 1048 if (ret) 1049 vcdev->dma_area->status = old_status; 1050 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 1051 } 1052 1053 static const char *virtio_ccw_bus_name(struct virtio_device *vdev) 1054 { 1055 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 1056 1057 return dev_name(&vcdev->cdev->dev); 1058 } 1059 1060 static void virtio_ccw_synchronize_cbs(struct virtio_device *vdev) 1061 { 1062 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 1063 struct airq_info *info = vcdev->airq_info; 1064 1065 if (info) { 1066 /* 1067 * This device uses adapter interrupts: synchronize with 1068 * vring_interrupt() called by virtio_airq_handler() 1069 * via the indicator area lock. 1070 */ 1071 write_lock_irq(&info->lock); 1072 write_unlock_irq(&info->lock); 1073 } else { 1074 /* This device uses classic interrupts: synchronize 1075 * with vring_interrupt() called by 1076 * virtio_ccw_int_handler() via the per-device 1077 * irq_lock 1078 */ 1079 write_lock_irq(&vcdev->irq_lock); 1080 write_unlock_irq(&vcdev->irq_lock); 1081 } 1082 } 1083 1084 static const struct virtio_config_ops virtio_ccw_config_ops = { 1085 .get_features = virtio_ccw_get_features, 1086 .finalize_features = virtio_ccw_finalize_features, 1087 .get = virtio_ccw_get_config, 1088 .set = virtio_ccw_set_config, 1089 .get_status = virtio_ccw_get_status, 1090 .set_status = virtio_ccw_set_status, 1091 .reset = virtio_ccw_reset, 1092 .find_vqs = virtio_ccw_find_vqs, 1093 .del_vqs = virtio_ccw_del_vqs, 1094 .bus_name = virtio_ccw_bus_name, 1095 .synchronize_cbs = virtio_ccw_synchronize_cbs, 1096 }; 1097 1098 1099 /* 1100 * ccw bus driver related functions 1101 */ 1102 1103 static void virtio_ccw_release_dev(struct device *_d) 1104 { 1105 struct virtio_device *dev = dev_to_virtio(_d); 1106 struct virtio_ccw_device *vcdev = to_vc_device(dev); 1107 1108 ccw_device_dma_free(vcdev->cdev, vcdev->dma_area, 1109 sizeof(*vcdev->dma_area)); 1110 kfree(vcdev); 1111 } 1112 1113 static int irb_is_error(struct irb *irb) 1114 { 1115 if (scsw_cstat(&irb->scsw) != 0) 1116 return 1; 1117 if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) 1118 return 1; 1119 if (scsw_cc(&irb->scsw) != 0) 1120 return 1; 1121 return 0; 1122 } 1123 1124 static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev, 1125 int index) 1126 { 1127 struct virtio_ccw_vq_info *info; 1128 unsigned long flags; 1129 struct virtqueue *vq; 1130 1131 vq = NULL; 1132 spin_lock_irqsave(&vcdev->lock, flags); 1133 list_for_each_entry(info, &vcdev->virtqueues, node) { 1134 if (info->vq->index == index) { 1135 vq = info->vq; 1136 break; 1137 } 1138 } 1139 spin_unlock_irqrestore(&vcdev->lock, flags); 1140 return vq; 1141 } 1142 1143 static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev, 1144 __u32 activity) 1145 { 1146 if (vcdev->curr_io & activity) { 1147 switch (activity) { 1148 case VIRTIO_CCW_DOING_READ_FEAT: 1149 case VIRTIO_CCW_DOING_WRITE_FEAT: 1150 case VIRTIO_CCW_DOING_READ_CONFIG: 1151 case VIRTIO_CCW_DOING_WRITE_CONFIG: 1152 case VIRTIO_CCW_DOING_WRITE_STATUS: 1153 case VIRTIO_CCW_DOING_READ_STATUS: 1154 case VIRTIO_CCW_DOING_SET_VQ: 1155 case VIRTIO_CCW_DOING_SET_IND: 1156 case VIRTIO_CCW_DOING_SET_CONF_IND: 1157 case VIRTIO_CCW_DOING_RESET: 1158 case VIRTIO_CCW_DOING_READ_VQ_CONF: 1159 case VIRTIO_CCW_DOING_SET_IND_ADAPTER: 1160 case VIRTIO_CCW_DOING_SET_VIRTIO_REV: 1161 vcdev->curr_io &= ~activity; 1162 wake_up(&vcdev->wait_q); 1163 break; 1164 default: 1165 /* don't know what to do... */ 1166 dev_warn(&vcdev->cdev->dev, 1167 "Suspicious activity '%08x'\n", activity); 1168 WARN_ON(1); 1169 break; 1170 } 1171 } 1172 } 1173 1174 static void virtio_ccw_int_handler(struct ccw_device *cdev, 1175 unsigned long intparm, 1176 struct irb *irb) 1177 { 1178 __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK; 1179 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1180 int i; 1181 struct virtqueue *vq; 1182 1183 if (!vcdev) 1184 return; 1185 if (IS_ERR(irb)) { 1186 vcdev->err = PTR_ERR(irb); 1187 virtio_ccw_check_activity(vcdev, activity); 1188 /* Don't poke around indicators, something's wrong. */ 1189 return; 1190 } 1191 /* Check if it's a notification from the host. */ 1192 if ((intparm == 0) && 1193 (scsw_stctl(&irb->scsw) == 1194 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) { 1195 /* OK */ 1196 } 1197 if (irb_is_error(irb)) { 1198 /* Command reject? */ 1199 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) && 1200 (irb->ecw[0] & SNS0_CMD_REJECT)) 1201 vcdev->err = -EOPNOTSUPP; 1202 else 1203 /* Map everything else to -EIO. */ 1204 vcdev->err = -EIO; 1205 } 1206 virtio_ccw_check_activity(vcdev, activity); 1207 #ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION 1208 /* 1209 * Paired with virtio_ccw_synchronize_cbs() and interrupts are 1210 * disabled here. 1211 */ 1212 read_lock(&vcdev->irq_lock); 1213 #endif 1214 for_each_set_bit(i, indicators(vcdev), 1215 sizeof(*indicators(vcdev)) * BITS_PER_BYTE) { 1216 /* The bit clear must happen before the vring kick. */ 1217 clear_bit(i, indicators(vcdev)); 1218 barrier(); 1219 vq = virtio_ccw_vq_by_ind(vcdev, i); 1220 vring_interrupt(0, vq); 1221 } 1222 #ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION 1223 read_unlock(&vcdev->irq_lock); 1224 #endif 1225 if (test_bit(0, indicators2(vcdev))) { 1226 virtio_config_changed(&vcdev->vdev); 1227 clear_bit(0, indicators2(vcdev)); 1228 } 1229 } 1230 1231 /* 1232 * We usually want to autoonline all devices, but give the admin 1233 * a way to exempt devices from this. 1234 */ 1235 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ 1236 (8*sizeof(long))) 1237 static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS]; 1238 1239 static char *no_auto = ""; 1240 1241 module_param(no_auto, charp, 0444); 1242 MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined"); 1243 1244 static int virtio_ccw_check_autoonline(struct ccw_device *cdev) 1245 { 1246 struct ccw_dev_id id; 1247 1248 ccw_device_get_id(cdev, &id); 1249 if (test_bit(id.devno, devs_no_auto[id.ssid])) 1250 return 0; 1251 return 1; 1252 } 1253 1254 static void virtio_ccw_auto_online(void *data, async_cookie_t cookie) 1255 { 1256 struct ccw_device *cdev = data; 1257 int ret; 1258 1259 ret = ccw_device_set_online(cdev); 1260 if (ret) 1261 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret); 1262 } 1263 1264 static int virtio_ccw_probe(struct ccw_device *cdev) 1265 { 1266 cdev->handler = virtio_ccw_int_handler; 1267 1268 if (virtio_ccw_check_autoonline(cdev)) 1269 async_schedule(virtio_ccw_auto_online, cdev); 1270 return 0; 1271 } 1272 1273 static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev) 1274 { 1275 unsigned long flags; 1276 struct virtio_ccw_device *vcdev; 1277 1278 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1279 vcdev = dev_get_drvdata(&cdev->dev); 1280 if (!vcdev || vcdev->going_away) { 1281 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1282 return NULL; 1283 } 1284 vcdev->going_away = true; 1285 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1286 return vcdev; 1287 } 1288 1289 static void virtio_ccw_remove(struct ccw_device *cdev) 1290 { 1291 unsigned long flags; 1292 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1293 1294 if (vcdev && cdev->online) { 1295 if (vcdev->device_lost) 1296 virtio_break_device(&vcdev->vdev); 1297 unregister_virtio_device(&vcdev->vdev); 1298 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1299 dev_set_drvdata(&cdev->dev, NULL); 1300 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1301 } 1302 cdev->handler = NULL; 1303 } 1304 1305 static int virtio_ccw_offline(struct ccw_device *cdev) 1306 { 1307 unsigned long flags; 1308 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1309 1310 if (!vcdev) 1311 return 0; 1312 if (vcdev->device_lost) 1313 virtio_break_device(&vcdev->vdev); 1314 unregister_virtio_device(&vcdev->vdev); 1315 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1316 dev_set_drvdata(&cdev->dev, NULL); 1317 cdev->dev.dma_parms = NULL; 1318 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1319 return 0; 1320 } 1321 1322 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev) 1323 { 1324 struct virtio_rev_info *rev; 1325 struct ccw1 *ccw; 1326 int ret; 1327 1328 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 1329 if (!ccw) 1330 return -ENOMEM; 1331 rev = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*rev), &ccw->cda); 1332 if (!rev) { 1333 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 1334 return -ENOMEM; 1335 } 1336 1337 /* Set transport revision */ 1338 ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV; 1339 ccw->flags = 0; 1340 ccw->count = sizeof(*rev); 1341 1342 vcdev->revision = VIRTIO_CCW_REV_MAX; 1343 do { 1344 rev->revision = vcdev->revision; 1345 /* none of our supported revisions carry payload */ 1346 rev->length = 0; 1347 ret = ccw_io_helper(vcdev, ccw, 1348 VIRTIO_CCW_DOING_SET_VIRTIO_REV); 1349 if (ret == -EOPNOTSUPP) { 1350 if (vcdev->revision == 0) 1351 /* 1352 * The host device does not support setting 1353 * the revision: let's operate it in legacy 1354 * mode. 1355 */ 1356 ret = 0; 1357 else 1358 vcdev->revision--; 1359 } 1360 } while (ret == -EOPNOTSUPP); 1361 1362 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 1363 ccw_device_dma_free(vcdev->cdev, rev, sizeof(*rev)); 1364 return ret; 1365 } 1366 1367 static int virtio_ccw_online(struct ccw_device *cdev) 1368 { 1369 int ret; 1370 struct virtio_ccw_device *vcdev; 1371 unsigned long flags; 1372 1373 vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL); 1374 if (!vcdev) { 1375 dev_warn(&cdev->dev, "Could not get memory for virtio\n"); 1376 ret = -ENOMEM; 1377 goto out_free; 1378 } 1379 vcdev->vdev.dev.parent = &cdev->dev; 1380 vcdev->cdev = cdev; 1381 cdev->dev.dma_parms = &vcdev->dma_parms; 1382 vcdev->dma_area = ccw_device_dma_zalloc(vcdev->cdev, 1383 sizeof(*vcdev->dma_area), 1384 &vcdev->dma_area_addr); 1385 if (!vcdev->dma_area) { 1386 ret = -ENOMEM; 1387 goto out_free; 1388 } 1389 1390 vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */ 1391 1392 vcdev->vdev.dev.release = virtio_ccw_release_dev; 1393 vcdev->vdev.config = &virtio_ccw_config_ops; 1394 init_waitqueue_head(&vcdev->wait_q); 1395 INIT_LIST_HEAD(&vcdev->virtqueues); 1396 spin_lock_init(&vcdev->lock); 1397 rwlock_init(&vcdev->irq_lock); 1398 mutex_init(&vcdev->io_lock); 1399 1400 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1401 dev_set_drvdata(&cdev->dev, vcdev); 1402 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1403 vcdev->vdev.id.vendor = cdev->id.cu_type; 1404 vcdev->vdev.id.device = cdev->id.cu_model; 1405 1406 ret = virtio_ccw_set_transport_rev(vcdev); 1407 if (ret) 1408 goto out_free; 1409 1410 ret = register_virtio_device(&vcdev->vdev); 1411 if (ret) { 1412 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n", 1413 ret); 1414 goto out_put; 1415 } 1416 return 0; 1417 out_put: 1418 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1419 dev_set_drvdata(&cdev->dev, NULL); 1420 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1421 put_device(&vcdev->vdev.dev); 1422 return ret; 1423 out_free: 1424 if (vcdev) { 1425 ccw_device_dma_free(vcdev->cdev, vcdev->dma_area, 1426 sizeof(*vcdev->dma_area)); 1427 } 1428 kfree(vcdev); 1429 return ret; 1430 } 1431 1432 static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event) 1433 { 1434 int rc; 1435 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1436 1437 /* 1438 * Make sure vcdev is set 1439 * i.e. set_offline/remove callback not already running 1440 */ 1441 if (!vcdev) 1442 return NOTIFY_DONE; 1443 1444 switch (event) { 1445 case CIO_GONE: 1446 vcdev->device_lost = true; 1447 rc = NOTIFY_DONE; 1448 break; 1449 case CIO_OPER: 1450 rc = NOTIFY_OK; 1451 break; 1452 default: 1453 rc = NOTIFY_DONE; 1454 break; 1455 } 1456 return rc; 1457 } 1458 1459 static struct ccw_device_id virtio_ids[] = { 1460 { CCW_DEVICE(0x3832, 0) }, 1461 {}, 1462 }; 1463 1464 static struct ccw_driver virtio_ccw_driver = { 1465 .driver = { 1466 .owner = THIS_MODULE, 1467 .name = "virtio_ccw", 1468 }, 1469 .ids = virtio_ids, 1470 .probe = virtio_ccw_probe, 1471 .remove = virtio_ccw_remove, 1472 .set_offline = virtio_ccw_offline, 1473 .set_online = virtio_ccw_online, 1474 .notify = virtio_ccw_cio_notify, 1475 .int_class = IRQIO_VIR, 1476 }; 1477 1478 static int __init pure_hex(char **cp, unsigned int *val, int min_digit, 1479 int max_digit, int max_val) 1480 { 1481 int diff; 1482 1483 diff = 0; 1484 *val = 0; 1485 1486 while (diff <= max_digit) { 1487 int value = hex_to_bin(**cp); 1488 1489 if (value < 0) 1490 break; 1491 *val = *val * 16 + value; 1492 (*cp)++; 1493 diff++; 1494 } 1495 1496 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) 1497 return 1; 1498 1499 return 0; 1500 } 1501 1502 static int __init parse_busid(char *str, unsigned int *cssid, 1503 unsigned int *ssid, unsigned int *devno) 1504 { 1505 char *str_work; 1506 int rc, ret; 1507 1508 rc = 1; 1509 1510 if (*str == '\0') 1511 goto out; 1512 1513 str_work = str; 1514 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); 1515 if (ret || (str_work[0] != '.')) 1516 goto out; 1517 str_work++; 1518 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); 1519 if (ret || (str_work[0] != '.')) 1520 goto out; 1521 str_work++; 1522 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); 1523 if (ret || (str_work[0] != '\0')) 1524 goto out; 1525 1526 rc = 0; 1527 out: 1528 return rc; 1529 } 1530 1531 static void __init no_auto_parse(void) 1532 { 1533 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; 1534 char *parm, *str; 1535 int rc; 1536 1537 str = no_auto; 1538 while ((parm = strsep(&str, ","))) { 1539 rc = parse_busid(strsep(&parm, "-"), &from_cssid, 1540 &from_ssid, &from); 1541 if (rc) 1542 continue; 1543 if (parm != NULL) { 1544 rc = parse_busid(parm, &to_cssid, 1545 &to_ssid, &to); 1546 if ((from_ssid > to_ssid) || 1547 ((from_ssid == to_ssid) && (from > to))) 1548 rc = -EINVAL; 1549 } else { 1550 to_cssid = from_cssid; 1551 to_ssid = from_ssid; 1552 to = from; 1553 } 1554 if (rc) 1555 continue; 1556 while ((from_ssid < to_ssid) || 1557 ((from_ssid == to_ssid) && (from <= to))) { 1558 set_bit(from, devs_no_auto[from_ssid]); 1559 from++; 1560 if (from > __MAX_SUBCHANNEL) { 1561 from_ssid++; 1562 from = 0; 1563 } 1564 } 1565 } 1566 } 1567 1568 static int __init virtio_ccw_init(void) 1569 { 1570 int rc; 1571 1572 /* parse no_auto string before we do anything further */ 1573 no_auto_parse(); 1574 1575 summary_indicators = cio_dma_zalloc(MAX_AIRQ_AREAS); 1576 if (!summary_indicators) 1577 return -ENOMEM; 1578 rc = ccw_driver_register(&virtio_ccw_driver); 1579 if (rc) 1580 cio_dma_free(summary_indicators, MAX_AIRQ_AREAS); 1581 return rc; 1582 } 1583 device_initcall(virtio_ccw_init); 1584