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virtio_ccw.c
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linux-6.19.14/drivers/s390/virtio/virtio_ccw.c
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 42struct 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 50struct vcdev_dma_area { 51 unsigned long indicators; 52 unsigned long indicators2; 53 struct vq_config_block config_block; 54 __u8 status; 55}; 56 57struct virtio_ccw_device { 58 struct virtio_device vdev; 59 __u8 config[VIRTIO_CCW_CONFIG_SIZE]; 60 struct ccw_device *cdev; 61 /* we make cdev->dev.dma_parms point to this */ 62 struct device_dma_parameters dma_parms; 63 __u32 curr_io; 64 int err; 65 unsigned int revision; /* Transport revision */ 66 wait_queue_head_t wait_q; 67 spinlock_t lock; 68 rwlock_t irq_lock; 69 struct mutex io_lock; /* Serializes I/O requests */ 70 struct list_head virtqueues; 71 bool is_thinint; 72 bool going_away; 73 bool device_lost; 74 unsigned int config_ready; 75 void *airq_info; 76 struct vcdev_dma_area *dma_area; 77 dma32_t dma_area_addr; 78}; 79 80static inline unsigned long *indicators(struct virtio_ccw_device *vcdev) 81{ 82 return &vcdev->dma_area->indicators; 83} 84 85static inline unsigned long *indicators2(struct virtio_ccw_device *vcdev) 86{ 87 return &vcdev->dma_area->indicators2; 88} 89 90/* Spec stipulates a 64 bit address */ 91static inline dma64_t indicators_dma(struct virtio_ccw_device *vcdev) 92{ 93 u64 dma_area_addr = dma32_to_u32(vcdev->dma_area_addr); 94 95 return dma64_add(u64_to_dma64(dma_area_addr), 96 offsetof(struct vcdev_dma_area, indicators)); 97} 98 99/* Spec stipulates a 64 bit address */ 100static inline dma64_t indicators2_dma(struct virtio_ccw_device *vcdev) 101{ 102 u64 dma_area_addr = dma32_to_u32(vcdev->dma_area_addr); 103 104 return dma64_add(u64_to_dma64(dma_area_addr), 105 offsetof(struct vcdev_dma_area, indicators2)); 106} 107 108static inline dma32_t config_block_dma(struct virtio_ccw_device *vcdev) 109{ 110 return dma32_add(vcdev->dma_area_addr, 111 offsetof(struct vcdev_dma_area, config_block)); 112} 113 114static inline dma32_t status_dma(struct virtio_ccw_device *vcdev) 115{ 116 return dma32_add(vcdev->dma_area_addr, 117 offsetof(struct vcdev_dma_area, status)); 118} 119 120struct vq_info_block_legacy { 121 dma64_t queue; 122 __u32 align; 123 __u16 index; 124 __u16 num; 125} __packed; 126 127struct vq_info_block { 128 dma64_t desc; 129 __u32 res0; 130 __u16 index; 131 __u16 num; 132 dma64_t avail; 133 dma64_t used; 134} __packed; 135 136struct virtio_feature_desc { 137 __le32 features; 138 __u8 index; 139} __packed; 140 141struct virtio_thinint_area { 142 dma64_t summary_indicator; 143 dma64_t indicator; 144 u64 bit_nr; 145 u8 isc; 146} __packed; 147 148struct virtio_rev_info { 149 __u16 revision; 150 __u16 length; 151 __u8 data[]; 152}; 153 154/* the highest virtio-ccw revision we support */ 155#define VIRTIO_CCW_REV_MAX 2 156 157struct virtio_ccw_vq_info { 158 struct virtqueue *vq; 159 dma32_t info_block_addr; 160 int num; 161 union { 162 struct vq_info_block s; 163 struct vq_info_block_legacy l; 164 } *info_block; 165 int bit_nr; 166 struct list_head node; 167 long cookie; 168}; 169 170#define VIRTIO_AIRQ_ISC IO_SCH_ISC /* inherit from subchannel */ 171 172#define VIRTIO_IV_BITS (L1_CACHE_BYTES * 8) 173#define MAX_AIRQ_AREAS 20 174 175static int virtio_ccw_use_airq = 1; 176 177struct airq_info { 178 rwlock_t lock; 179 u8 summary_indicator_idx; 180 struct airq_struct airq; 181 struct airq_iv *aiv; 182}; 183static struct airq_info *airq_areas[MAX_AIRQ_AREAS]; 184static DEFINE_MUTEX(airq_areas_lock); 185 186static u8 *summary_indicators; 187 188static inline u8 *get_summary_indicator(struct airq_info *info) 189{ 190 return summary_indicators + info->summary_indicator_idx; 191} 192 193static inline dma64_t get_summary_indicator_dma(struct airq_info *info) 194{ 195 return virt_to_dma64(get_summary_indicator(info)); 196} 197 198#define CCW_CMD_SET_VQ 0x13 199#define CCW_CMD_VDEV_RESET 0x33 200#define CCW_CMD_SET_IND 0x43 201#define CCW_CMD_SET_CONF_IND 0x53 202#define CCW_CMD_READ_FEAT 0x12 203#define CCW_CMD_WRITE_FEAT 0x11 204#define CCW_CMD_READ_CONF 0x22 205#define CCW_CMD_WRITE_CONF 0x21 206#define CCW_CMD_WRITE_STATUS 0x31 207#define CCW_CMD_READ_VQ_CONF 0x32 208#define CCW_CMD_READ_STATUS 0x72 209#define CCW_CMD_SET_IND_ADAPTER 0x73 210#define CCW_CMD_SET_VIRTIO_REV 0x83 211 212#define VIRTIO_CCW_DOING_SET_VQ 0x00010000 213#define VIRTIO_CCW_DOING_RESET 0x00040000 214#define VIRTIO_CCW_DOING_READ_FEAT 0x00080000 215#define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000 216#define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000 217#define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000 218#define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000 219#define VIRTIO_CCW_DOING_SET_IND 0x01000000 220#define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000 221#define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000 222#define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000 223#define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000 224#define VIRTIO_CCW_DOING_READ_STATUS 0x20000000 225#define VIRTIO_CCW_INTPARM_MASK 0xffff0000 226 227static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev) 228{ 229 return container_of(vdev, struct virtio_ccw_device, vdev); 230} 231 232static void drop_airq_indicator(struct virtqueue *vq, struct airq_info *info) 233{ 234 unsigned long i, flags; 235 236 write_lock_irqsave(&info->lock, flags); 237 for (i = 0; i < airq_iv_end(info->aiv); i++) { 238 if (vq == (void *)airq_iv_get_ptr(info->aiv, i)) { 239 airq_iv_free_bit(info->aiv, i); 240 airq_iv_set_ptr(info->aiv, i, 0); 241 break; 242 } 243 } 244 write_unlock_irqrestore(&info->lock, flags); 245} 246 247static void virtio_airq_handler(struct airq_struct *airq, 248 struct tpi_info *tpi_info) 249{ 250 struct airq_info *info = container_of(airq, struct airq_info, airq); 251 unsigned long ai; 252 253 inc_irq_stat(IRQIO_VAI); 254 read_lock(&info->lock); 255 /* Walk through indicators field, summary indicator active. */ 256 for (ai = 0;;) { 257 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv)); 258 if (ai == -1UL) 259 break; 260 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai)); 261 } 262 *(get_summary_indicator(info)) = 0; 263 smp_wmb(); 264 /* Walk through indicators field, summary indicator not active. */ 265 for (ai = 0;;) { 266 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv)); 267 if (ai == -1UL) 268 break; 269 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai)); 270 } 271 read_unlock(&info->lock); 272} 273 274static struct airq_info *new_airq_info(int index) 275{ 276 struct airq_info *info; 277 int rc; 278 279 info = kzalloc(sizeof(*info), GFP_KERNEL); 280 if (!info) 281 return NULL; 282 rwlock_init(&info->lock); 283 info->aiv = airq_iv_create(VIRTIO_IV_BITS, AIRQ_IV_ALLOC | AIRQ_IV_PTR 284 | AIRQ_IV_CACHELINE, NULL); 285 if (!info->aiv) { 286 kfree(info); 287 return NULL; 288 } 289 info->airq.handler = virtio_airq_handler; 290 info->summary_indicator_idx = index; 291 info->airq.lsi_ptr = get_summary_indicator(info); 292 info->airq.isc = VIRTIO_AIRQ_ISC; 293 rc = register_adapter_interrupt(&info->airq); 294 if (rc) { 295 airq_iv_release(info->aiv); 296 kfree(info); 297 return NULL; 298 } 299 return info; 300} 301 302static unsigned long *get_airq_indicator(struct virtqueue *vqs[], int nvqs, 303 u64 *first, void **airq_info) 304{ 305 int i, j, queue_idx, highest_queue_idx = -1; 306 struct airq_info *info; 307 unsigned long *indicator_addr = NULL; 308 unsigned long bit, flags; 309 310 /* Array entries without an actual queue pointer must be ignored. */ 311 for (i = 0; i < nvqs; i++) { 312 if (vqs[i]) 313 highest_queue_idx++; 314 } 315 316 for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) { 317 mutex_lock(&airq_areas_lock); 318 if (!airq_areas[i]) 319 airq_areas[i] = new_airq_info(i); 320 info = airq_areas[i]; 321 mutex_unlock(&airq_areas_lock); 322 if (!info) 323 return NULL; 324 write_lock_irqsave(&info->lock, flags); 325 bit = airq_iv_alloc(info->aiv, highest_queue_idx + 1); 326 if (bit == -1UL) { 327 /* Not enough vacancies. */ 328 write_unlock_irqrestore(&info->lock, flags); 329 continue; 330 } 331 *first = bit; 332 *airq_info = info; 333 indicator_addr = info->aiv->vector; 334 for (j = 0, queue_idx = 0; j < nvqs; j++) { 335 if (!vqs[j]) 336 continue; 337 airq_iv_set_ptr(info->aiv, bit + queue_idx++, 338 (unsigned long)vqs[j]); 339 } 340 write_unlock_irqrestore(&info->lock, flags); 341 } 342 return indicator_addr; 343} 344 345static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev) 346{ 347 struct virtio_ccw_vq_info *info; 348 349 if (!vcdev->airq_info) 350 return; 351 list_for_each_entry(info, &vcdev->virtqueues, node) 352 drop_airq_indicator(info->vq, vcdev->airq_info); 353} 354 355static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag) 356{ 357 unsigned long flags; 358 __u32 ret; 359 360 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); 361 if (vcdev->err) 362 ret = 0; 363 else 364 ret = vcdev->curr_io & flag; 365 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); 366 return ret; 367} 368 369static int ccw_io_helper(struct virtio_ccw_device *vcdev, 370 struct ccw1 *ccw, __u32 intparm) 371{ 372 int ret; 373 unsigned long flags; 374 int flag = intparm & VIRTIO_CCW_INTPARM_MASK; 375 376 mutex_lock(&vcdev->io_lock); 377 do { 378 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); 379 ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0); 380 if (!ret) { 381 if (!vcdev->curr_io) 382 vcdev->err = 0; 383 vcdev->curr_io |= flag; 384 } 385 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); 386 cpu_relax(); 387 } while (ret == -EBUSY); 388 wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0); 389 ret = ret ? ret : vcdev->err; 390 mutex_unlock(&vcdev->io_lock); 391 return ret; 392} 393 394static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev, 395 struct ccw1 *ccw) 396{ 397 int ret; 398 struct virtio_thinint_area *thinint_area = NULL; 399 struct airq_info *airq_info = vcdev->airq_info; 400 dma64_t *indicatorp = NULL; 401 402 if (vcdev->is_thinint) { 403 thinint_area = ccw_device_dma_zalloc(vcdev->cdev, 404 sizeof(*thinint_area), 405 &ccw->cda); 406 if (!thinint_area) 407 return; 408 thinint_area->summary_indicator = 409 get_summary_indicator_dma(airq_info); 410 thinint_area->isc = VIRTIO_AIRQ_ISC; 411 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; 412 ccw->count = sizeof(*thinint_area); 413 } else { 414 /* payload is the address of the indicators */ 415 indicatorp = ccw_device_dma_zalloc(vcdev->cdev, 416 sizeof(*indicatorp), 417 &ccw->cda); 418 if (!indicatorp) 419 return; 420 *indicatorp = 0; 421 ccw->cmd_code = CCW_CMD_SET_IND; 422 ccw->count = sizeof(*indicatorp); 423 } 424 /* Deregister indicators from host. */ 425 *indicators(vcdev) = 0; 426 ccw->flags = 0; 427 ret = ccw_io_helper(vcdev, ccw, 428 vcdev->is_thinint ? 429 VIRTIO_CCW_DOING_SET_IND_ADAPTER : 430 VIRTIO_CCW_DOING_SET_IND); 431 if (ret && (ret != -ENODEV)) 432 dev_info(&vcdev->cdev->dev, 433 "Failed to deregister indicators (%d)\n", ret); 434 else if (vcdev->is_thinint) 435 virtio_ccw_drop_indicators(vcdev); 436 ccw_device_dma_free(vcdev->cdev, indicatorp, sizeof(*indicatorp)); 437 ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area)); 438} 439 440static inline bool virtio_ccw_do_kvm_notify(struct virtqueue *vq, u32 data) 441{ 442 struct virtio_ccw_vq_info *info = vq->priv; 443 struct virtio_ccw_device *vcdev; 444 struct subchannel_id schid; 445 446 vcdev = to_vc_device(info->vq->vdev); 447 ccw_device_get_schid(vcdev->cdev, &schid); 448 BUILD_BUG_ON(sizeof(struct subchannel_id) != sizeof(unsigned int)); 449 info->cookie = kvm_hypercall3(KVM_S390_VIRTIO_CCW_NOTIFY, 450 *((unsigned int *)&schid), 451 data, info->cookie); 452 if (info->cookie < 0) 453 return false; 454 return true; 455} 456 457static bool virtio_ccw_kvm_notify(struct virtqueue *vq) 458{ 459 return virtio_ccw_do_kvm_notify(vq, vq->index); 460} 461 462static bool virtio_ccw_kvm_notify_with_data(struct virtqueue *vq) 463{ 464 return virtio_ccw_do_kvm_notify(vq, vring_notification_data(vq)); 465} 466 467static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev, 468 struct ccw1 *ccw, int index) 469{ 470 int ret; 471 472 vcdev->dma_area->config_block.index = index; 473 ccw->cmd_code = CCW_CMD_READ_VQ_CONF; 474 ccw->flags = 0; 475 ccw->count = sizeof(struct vq_config_block); 476 ccw->cda = config_block_dma(vcdev); 477 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF); 478 if (ret) 479 return ret; 480 return vcdev->dma_area->config_block.num ?: -ENOENT; 481} 482 483static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw) 484{ 485 struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev); 486 struct virtio_ccw_vq_info *info = vq->priv; 487 unsigned long flags; 488 int ret; 489 unsigned int index = vq->index; 490 491 /* Remove from our list. */ 492 spin_lock_irqsave(&vcdev->lock, flags); 493 list_del(&info->node); 494 spin_unlock_irqrestore(&vcdev->lock, flags); 495 496 /* Release from host. */ 497 if (vcdev->revision == 0) { 498 info->info_block->l.queue = 0; 499 info->info_block->l.align = 0; 500 info->info_block->l.index = index; 501 info->info_block->l.num = 0; 502 ccw->count = sizeof(info->info_block->l); 503 } else { 504 info->info_block->s.desc = 0; 505 info->info_block->s.index = index; 506 info->info_block->s.num = 0; 507 info->info_block->s.avail = 0; 508 info->info_block->s.used = 0; 509 ccw->count = sizeof(info->info_block->s); 510 } 511 ccw->cmd_code = CCW_CMD_SET_VQ; 512 ccw->flags = 0; 513 ccw->cda = info->info_block_addr; 514 ret = ccw_io_helper(vcdev, ccw, 515 VIRTIO_CCW_DOING_SET_VQ | index); 516 /* 517 * -ENODEV isn't considered an error: The device is gone anyway. 518 * This may happen on device detach. 519 */ 520 if (ret && (ret != -ENODEV)) 521 dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d\n", 522 ret, index); 523 524 vring_del_virtqueue(vq); 525 ccw_device_dma_free(vcdev->cdev, info->info_block, 526 sizeof(*info->info_block)); 527 kfree(info); 528} 529 530static void virtio_ccw_del_vqs(struct virtio_device *vdev) 531{ 532 struct virtqueue *vq, *n; 533 struct ccw1 *ccw; 534 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 535 536 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 537 if (!ccw) 538 return; 539 540 virtio_ccw_drop_indicator(vcdev, ccw); 541 542 list_for_each_entry_safe(vq, n, &vdev->vqs, list) 543 virtio_ccw_del_vq(vq, ccw); 544 545 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 546} 547 548static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev, 549 int i, vq_callback_t *callback, 550 const char *name, bool ctx, 551 struct ccw1 *ccw) 552{ 553 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 554 bool (*notify)(struct virtqueue *vq); 555 int err; 556 struct virtqueue *vq = NULL; 557 struct virtio_ccw_vq_info *info; 558 u64 queue; 559 unsigned long flags; 560 bool may_reduce; 561 562 if (__virtio_test_bit(vdev, VIRTIO_F_NOTIFICATION_DATA)) 563 notify = virtio_ccw_kvm_notify_with_data; 564 else 565 notify = virtio_ccw_kvm_notify; 566 567 /* Allocate queue. */ 568 info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL); 569 if (!info) { 570 dev_warn(&vcdev->cdev->dev, "no info\n"); 571 err = -ENOMEM; 572 goto out_err; 573 } 574 info->info_block = ccw_device_dma_zalloc(vcdev->cdev, 575 sizeof(*info->info_block), 576 &info->info_block_addr); 577 if (!info->info_block) { 578 dev_warn(&vcdev->cdev->dev, "no info block\n"); 579 err = -ENOMEM; 580 goto out_err; 581 } 582 info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i); 583 if (info->num < 0) { 584 err = info->num; 585 goto out_err; 586 } 587 may_reduce = vcdev->revision > 0; 588 vq = vring_create_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, 589 vdev, true, may_reduce, ctx, 590 notify, callback, name); 591 592 if (!vq) { 593 /* For now, we fail if we can't get the requested size. */ 594 dev_warn(&vcdev->cdev->dev, "no vq\n"); 595 err = -ENOMEM; 596 goto out_err; 597 } 598 599 vq->num_max = info->num; 600 601 /* it may have been reduced */ 602 info->num = virtqueue_get_vring_size(vq); 603 604 /* Register it with the host. */ 605 queue = virtqueue_get_desc_addr(vq); 606 if (vcdev->revision == 0) { 607 info->info_block->l.queue = u64_to_dma64(queue); 608 info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN; 609 info->info_block->l.index = i; 610 info->info_block->l.num = info->num; 611 ccw->count = sizeof(info->info_block->l); 612 } else { 613 info->info_block->s.desc = u64_to_dma64(queue); 614 info->info_block->s.index = i; 615 info->info_block->s.num = info->num; 616 info->info_block->s.avail = u64_to_dma64(virtqueue_get_avail_addr(vq)); 617 info->info_block->s.used = u64_to_dma64(virtqueue_get_used_addr(vq)); 618 ccw->count = sizeof(info->info_block->s); 619 } 620 ccw->cmd_code = CCW_CMD_SET_VQ; 621 ccw->flags = 0; 622 ccw->cda = info->info_block_addr; 623 err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i); 624 if (err) { 625 dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n"); 626 goto out_err; 627 } 628 629 info->vq = vq; 630 vq->priv = info; 631 632 /* Save it to our list. */ 633 spin_lock_irqsave(&vcdev->lock, flags); 634 list_add(&info->node, &vcdev->virtqueues); 635 spin_unlock_irqrestore(&vcdev->lock, flags); 636 637 return vq; 638 639out_err: 640 if (vq) 641 vring_del_virtqueue(vq); 642 if (info) { 643 ccw_device_dma_free(vcdev->cdev, info->info_block, 644 sizeof(*info->info_block)); 645 } 646 kfree(info); 647 return ERR_PTR(err); 648} 649 650static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev, 651 struct virtqueue *vqs[], int nvqs, 652 struct ccw1 *ccw) 653{ 654 int ret; 655 struct virtio_thinint_area *thinint_area = NULL; 656 unsigned long *indicator_addr; 657 struct airq_info *info; 658 659 thinint_area = ccw_device_dma_zalloc(vcdev->cdev, 660 sizeof(*thinint_area), 661 &ccw->cda); 662 if (!thinint_area) { 663 ret = -ENOMEM; 664 goto out; 665 } 666 /* Try to get an indicator. */ 667 indicator_addr = get_airq_indicator(vqs, nvqs, 668 &thinint_area->bit_nr, 669 &vcdev->airq_info); 670 if (!indicator_addr) { 671 ret = -ENOSPC; 672 goto out; 673 } 674 thinint_area->indicator = virt_to_dma64(indicator_addr); 675 info = vcdev->airq_info; 676 thinint_area->summary_indicator = get_summary_indicator_dma(info); 677 thinint_area->isc = VIRTIO_AIRQ_ISC; 678 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; 679 ccw->flags = CCW_FLAG_SLI; 680 ccw->count = sizeof(*thinint_area); 681 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER); 682 if (ret) { 683 if (ret == -EOPNOTSUPP) { 684 /* 685 * The host does not support adapter interrupts 686 * for virtio-ccw, stop trying. 687 */ 688 virtio_ccw_use_airq = 0; 689 pr_info("Adapter interrupts unsupported on host\n"); 690 } else 691 dev_warn(&vcdev->cdev->dev, 692 "enabling adapter interrupts = %d\n", ret); 693 virtio_ccw_drop_indicators(vcdev); 694 } 695out: 696 ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area)); 697 return ret; 698} 699 700static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, 701 struct virtqueue *vqs[], 702 struct virtqueue_info vqs_info[], 703 struct irq_affinity *desc) 704{ 705 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 706 dma64_t *indicatorp = NULL; 707 int ret, i, queue_idx = 0; 708 struct ccw1 *ccw; 709 dma32_t indicatorp_dma = 0; 710 711 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 712 if (!ccw) 713 return -ENOMEM; 714 715 for (i = 0; i < nvqs; ++i) { 716 struct virtqueue_info *vqi = &vqs_info[i]; 717 718 if (!vqi->name) { 719 vqs[i] = NULL; 720 continue; 721 } 722 723 vqs[i] = virtio_ccw_setup_vq(vdev, queue_idx++, vqi->callback, 724 vqi->name, vqi->ctx, ccw); 725 if (IS_ERR(vqs[i])) { 726 ret = PTR_ERR(vqs[i]); 727 vqs[i] = NULL; 728 goto out; 729 } 730 } 731 ret = -ENOMEM; 732 /* 733 * We need a data area under 2G to communicate. Our payload is 734 * the address of the indicators. 735 */ 736 indicatorp = ccw_device_dma_zalloc(vcdev->cdev, 737 sizeof(*indicatorp), 738 &indicatorp_dma); 739 if (!indicatorp) 740 goto out; 741 *indicatorp = indicators_dma(vcdev); 742 if (vcdev->is_thinint) { 743 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw); 744 if (ret) 745 /* no error, just fall back to legacy interrupts */ 746 vcdev->is_thinint = false; 747 } 748 ccw->cda = indicatorp_dma; 749 if (!vcdev->is_thinint) { 750 /* Register queue indicators with host. */ 751 *indicators(vcdev) = 0; 752 ccw->cmd_code = CCW_CMD_SET_IND; 753 ccw->flags = 0; 754 ccw->count = sizeof(*indicatorp); 755 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND); 756 if (ret) 757 goto out; 758 } 759 /* Register indicators2 with host for config changes */ 760 *indicatorp = indicators2_dma(vcdev); 761 *indicators2(vcdev) = 0; 762 ccw->cmd_code = CCW_CMD_SET_CONF_IND; 763 ccw->flags = 0; 764 ccw->count = sizeof(*indicatorp); 765 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND); 766 if (ret) 767 goto out; 768 769 if (indicatorp) 770 ccw_device_dma_free(vcdev->cdev, indicatorp, 771 sizeof(*indicatorp)); 772 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 773 return 0; 774out: 775 if (indicatorp) 776 ccw_device_dma_free(vcdev->cdev, indicatorp, 777 sizeof(*indicatorp)); 778 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 779 virtio_ccw_del_vqs(vdev); 780 return ret; 781} 782 783static void virtio_ccw_reset(struct virtio_device *vdev) 784{ 785 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 786 struct ccw1 *ccw; 787 788 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 789 if (!ccw) 790 return; 791 792 /* Zero status bits. */ 793 vcdev->dma_area->status = 0; 794 795 /* Send a reset ccw on device. */ 796 ccw->cmd_code = CCW_CMD_VDEV_RESET; 797 ccw->flags = 0; 798 ccw->count = 0; 799 ccw->cda = 0; 800 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET); 801 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 802} 803 804static u64 virtio_ccw_get_features(struct virtio_device *vdev) 805{ 806 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 807 struct virtio_feature_desc *features; 808 int ret; 809 u64 rc; 810 struct ccw1 *ccw; 811 812 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 813 if (!ccw) 814 return 0; 815 816 features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features), 817 &ccw->cda); 818 if (!features) { 819 rc = 0; 820 goto out_free; 821 } 822 /* Read the feature bits from the host. */ 823 features->index = 0; 824 ccw->cmd_code = CCW_CMD_READ_FEAT; 825 ccw->flags = 0; 826 ccw->count = sizeof(*features); 827 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 828 if (ret) { 829 rc = 0; 830 goto out_free; 831 } 832 833 rc = le32_to_cpu(features->features); 834 835 if (vcdev->revision == 0) 836 goto out_free; 837 838 /* Read second half of the feature bits from the host. */ 839 features->index = 1; 840 ccw->cmd_code = CCW_CMD_READ_FEAT; 841 ccw->flags = 0; 842 ccw->count = sizeof(*features); 843 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); 844 if (ret == 0) 845 rc |= (u64)le32_to_cpu(features->features) << 32; 846 847out_free: 848 ccw_device_dma_free(vcdev->cdev, features, sizeof(*features)); 849 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 850 return rc; 851} 852 853static void ccw_transport_features(struct virtio_device *vdev) 854{ 855 /* 856 * Currently nothing to do here. 857 */ 858} 859 860static int virtio_ccw_finalize_features(struct virtio_device *vdev) 861{ 862 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 863 struct virtio_feature_desc *features; 864 struct ccw1 *ccw; 865 int ret; 866 867 if (vcdev->revision >= 1 && 868 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { 869 dev_err(&vdev->dev, "virtio: device uses revision 1 " 870 "but does not have VIRTIO_F_VERSION_1\n"); 871 return -EINVAL; 872 } 873 874 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 875 if (!ccw) 876 return -ENOMEM; 877 878 features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features), 879 &ccw->cda); 880 if (!features) { 881 ret = -ENOMEM; 882 goto out_free; 883 } 884 /* Give virtio_ring a chance to accept features. */ 885 vring_transport_features(vdev); 886 887 /* Give virtio_ccw a chance to accept features. */ 888 ccw_transport_features(vdev); 889 890 features->index = 0; 891 features->features = cpu_to_le32((u32)vdev->features); 892 /* Write the first half of the feature bits to the host. */ 893 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 894 ccw->flags = 0; 895 ccw->count = sizeof(*features); 896 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 897 if (ret) 898 goto out_free; 899 900 if (vcdev->revision == 0) 901 goto out_free; 902 903 features->index = 1; 904 features->features = cpu_to_le32(vdev->features >> 32); 905 /* Write the second half of the feature bits to the host. */ 906 ccw->cmd_code = CCW_CMD_WRITE_FEAT; 907 ccw->flags = 0; 908 ccw->count = sizeof(*features); 909 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); 910 911out_free: 912 ccw_device_dma_free(vcdev->cdev, features, sizeof(*features)); 913 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 914 915 return ret; 916} 917 918static void virtio_ccw_get_config(struct virtio_device *vdev, 919 unsigned int offset, void *buf, unsigned len) 920{ 921 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 922 int ret; 923 struct ccw1 *ccw; 924 void *config_area; 925 unsigned long flags; 926 927 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 928 if (!ccw) 929 return; 930 931 config_area = ccw_device_dma_zalloc(vcdev->cdev, 932 VIRTIO_CCW_CONFIG_SIZE, 933 &ccw->cda); 934 if (!config_area) 935 goto out_free; 936 937 /* Read the config area from the host. */ 938 ccw->cmd_code = CCW_CMD_READ_CONF; 939 ccw->flags = 0; 940 ccw->count = offset + len; 941 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG); 942 if (ret) 943 goto out_free; 944 945 spin_lock_irqsave(&vcdev->lock, flags); 946 memcpy(vcdev->config, config_area, offset + len); 947 if (vcdev->config_ready < offset + len) 948 vcdev->config_ready = offset + len; 949 spin_unlock_irqrestore(&vcdev->lock, flags); 950 if (buf) 951 memcpy(buf, config_area + offset, len); 952 953out_free: 954 ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE); 955 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 956} 957 958static void virtio_ccw_set_config(struct virtio_device *vdev, 959 unsigned int offset, const void *buf, 960 unsigned len) 961{ 962 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 963 struct ccw1 *ccw; 964 void *config_area; 965 unsigned long flags; 966 967 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 968 if (!ccw) 969 return; 970 971 config_area = ccw_device_dma_zalloc(vcdev->cdev, 972 VIRTIO_CCW_CONFIG_SIZE, 973 &ccw->cda); 974 if (!config_area) 975 goto out_free; 976 977 /* Make sure we don't overwrite fields. */ 978 if (vcdev->config_ready < offset) 979 virtio_ccw_get_config(vdev, 0, NULL, offset); 980 spin_lock_irqsave(&vcdev->lock, flags); 981 memcpy(&vcdev->config[offset], buf, len); 982 /* Write the config area to the host. */ 983 memcpy(config_area, vcdev->config, sizeof(vcdev->config)); 984 spin_unlock_irqrestore(&vcdev->lock, flags); 985 ccw->cmd_code = CCW_CMD_WRITE_CONF; 986 ccw->flags = 0; 987 ccw->count = offset + len; 988 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG); 989 990out_free: 991 ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE); 992 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 993} 994 995static u8 virtio_ccw_get_status(struct virtio_device *vdev) 996{ 997 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 998 u8 old_status = vcdev->dma_area->status; 999 struct ccw1 *ccw; 1000 1001 if (vcdev->revision < 2) 1002 return vcdev->dma_area->status; 1003 1004 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 1005 if (!ccw) 1006 return old_status; 1007 1008 ccw->cmd_code = CCW_CMD_READ_STATUS; 1009 ccw->flags = 0; 1010 ccw->count = sizeof(vcdev->dma_area->status); 1011 ccw->cda = status_dma(vcdev); 1012 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS); 1013/* 1014 * If the channel program failed (should only happen if the device 1015 * was hotunplugged, and then we clean up via the machine check 1016 * handler anyway), vcdev->dma_area->status was not overwritten and we just 1017 * return the old status, which is fine. 1018*/ 1019 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 1020 1021 return vcdev->dma_area->status; 1022} 1023 1024static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status) 1025{ 1026 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 1027 u8 old_status = vcdev->dma_area->status; 1028 struct ccw1 *ccw; 1029 int ret; 1030 1031 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 1032 if (!ccw) 1033 return; 1034 1035 /* Write the status to the host. */ 1036 vcdev->dma_area->status = status; 1037 ccw->cmd_code = CCW_CMD_WRITE_STATUS; 1038 ccw->flags = 0; 1039 ccw->count = sizeof(status); 1040 /* We use ssch for setting the status which is a serializing 1041 * instruction that guarantees the memory writes have 1042 * completed before ssch. 1043 */ 1044 ccw->cda = status_dma(vcdev); 1045 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS); 1046 /* Write failed? We assume status is unchanged. */ 1047 if (ret) 1048 vcdev->dma_area->status = old_status; 1049 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 1050} 1051 1052static const char *virtio_ccw_bus_name(struct virtio_device *vdev) 1053{ 1054 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 1055 1056 return dev_name(&vcdev->cdev->dev); 1057} 1058 1059static void virtio_ccw_synchronize_cbs(struct virtio_device *vdev) 1060{ 1061 struct virtio_ccw_device *vcdev = to_vc_device(vdev); 1062 struct airq_info *info = vcdev->airq_info; 1063 1064 if (info) { 1065 /* 1066 * This device uses adapter interrupts: synchronize with 1067 * vring_interrupt() called by virtio_airq_handler() 1068 * via the indicator area lock. 1069 */ 1070 write_lock_irq(&info->lock); 1071 write_unlock_irq(&info->lock); 1072 } else { 1073 /* This device uses classic interrupts: synchronize 1074 * with vring_interrupt() called by 1075 * virtio_ccw_int_handler() via the per-device 1076 * irq_lock 1077 */ 1078 write_lock_irq(&vcdev->irq_lock); 1079 write_unlock_irq(&vcdev->irq_lock); 1080 } 1081} 1082 1083static const struct virtio_config_ops virtio_ccw_config_ops = { 1084 .get_features = virtio_ccw_get_features, 1085 .finalize_features = virtio_ccw_finalize_features, 1086 .get = virtio_ccw_get_config, 1087 .set = virtio_ccw_set_config, 1088 .get_status = virtio_ccw_get_status, 1089 .set_status = virtio_ccw_set_status, 1090 .reset = virtio_ccw_reset, 1091 .find_vqs = virtio_ccw_find_vqs, 1092 .del_vqs = virtio_ccw_del_vqs, 1093 .bus_name = virtio_ccw_bus_name, 1094 .synchronize_cbs = virtio_ccw_synchronize_cbs, 1095}; 1096 1097 1098/* 1099 * ccw bus driver related functions 1100 */ 1101 1102static void virtio_ccw_release_dev(struct device *_d) 1103{ 1104 struct virtio_device *dev = dev_to_virtio(_d); 1105 struct virtio_ccw_device *vcdev = to_vc_device(dev); 1106 1107 ccw_device_dma_free(vcdev->cdev, vcdev->dma_area, 1108 sizeof(*vcdev->dma_area)); 1109 kfree(vcdev); 1110} 1111 1112static int irb_is_error(struct irb *irb) 1113{ 1114 if (scsw_cstat(&irb->scsw) != 0) 1115 return 1; 1116 if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) 1117 return 1; 1118 if (scsw_cc(&irb->scsw) != 0) 1119 return 1; 1120 return 0; 1121} 1122 1123static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev, 1124 int index) 1125{ 1126 struct virtio_ccw_vq_info *info; 1127 unsigned long flags; 1128 struct virtqueue *vq; 1129 1130 vq = NULL; 1131 spin_lock_irqsave(&vcdev->lock, flags); 1132 list_for_each_entry(info, &vcdev->virtqueues, node) { 1133 if (info->vq->index == index) { 1134 vq = info->vq; 1135 break; 1136 } 1137 } 1138 spin_unlock_irqrestore(&vcdev->lock, flags); 1139 return vq; 1140} 1141 1142static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev, 1143 __u32 activity) 1144{ 1145 if (vcdev->curr_io & activity) { 1146 switch (activity) { 1147 case VIRTIO_CCW_DOING_READ_FEAT: 1148 case VIRTIO_CCW_DOING_WRITE_FEAT: 1149 case VIRTIO_CCW_DOING_READ_CONFIG: 1150 case VIRTIO_CCW_DOING_WRITE_CONFIG: 1151 case VIRTIO_CCW_DOING_WRITE_STATUS: 1152 case VIRTIO_CCW_DOING_READ_STATUS: 1153 case VIRTIO_CCW_DOING_SET_VQ: 1154 case VIRTIO_CCW_DOING_SET_IND: 1155 case VIRTIO_CCW_DOING_SET_CONF_IND: 1156 case VIRTIO_CCW_DOING_RESET: 1157 case VIRTIO_CCW_DOING_READ_VQ_CONF: 1158 case VIRTIO_CCW_DOING_SET_IND_ADAPTER: 1159 case VIRTIO_CCW_DOING_SET_VIRTIO_REV: 1160 vcdev->curr_io &= ~activity; 1161 wake_up(&vcdev->wait_q); 1162 break; 1163 default: 1164 /* don't know what to do... */ 1165 dev_warn(&vcdev->cdev->dev, 1166 "Suspicious activity '%08x'\n", activity); 1167 WARN_ON(1); 1168 break; 1169 } 1170 } 1171} 1172 1173static void virtio_ccw_int_handler(struct ccw_device *cdev, 1174 unsigned long intparm, 1175 struct irb *irb) 1176{ 1177 __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK; 1178 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1179 int i; 1180 struct virtqueue *vq; 1181 1182 if (!vcdev) 1183 return; 1184 if (IS_ERR(irb)) { 1185 vcdev->err = PTR_ERR(irb); 1186 virtio_ccw_check_activity(vcdev, activity); 1187 /* Don't poke around indicators, something's wrong. */ 1188 return; 1189 } 1190 /* Check if it's a notification from the host. */ 1191 if ((intparm == 0) && 1192 (scsw_stctl(&irb->scsw) == 1193 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) { 1194 /* OK */ 1195 } 1196 if (irb_is_error(irb)) { 1197 /* Command reject? */ 1198 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) && 1199 (irb->ecw[0] & SNS0_CMD_REJECT)) 1200 vcdev->err = -EOPNOTSUPP; 1201 else 1202 /* Map everything else to -EIO. */ 1203 vcdev->err = -EIO; 1204 } 1205 virtio_ccw_check_activity(vcdev, activity); 1206#ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION 1207 /* 1208 * Paired with virtio_ccw_synchronize_cbs() and interrupts are 1209 * disabled here. 1210 */ 1211 read_lock(&vcdev->irq_lock); 1212#endif 1213 for_each_set_bit(i, indicators(vcdev), 1214 sizeof(*indicators(vcdev)) * BITS_PER_BYTE) { 1215 /* The bit clear must happen before the vring kick. */ 1216 clear_bit(i, indicators(vcdev)); 1217 barrier(); 1218 vq = virtio_ccw_vq_by_ind(vcdev, i); 1219 vring_interrupt(0, vq); 1220 } 1221#ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION 1222 read_unlock(&vcdev->irq_lock); 1223#endif 1224 if (test_bit(0, indicators2(vcdev))) { 1225 virtio_config_changed(&vcdev->vdev); 1226 clear_bit(0, indicators2(vcdev)); 1227 } 1228} 1229 1230/* 1231 * We usually want to autoonline all devices, but give the admin 1232 * a way to exempt devices from this. 1233 */ 1234#define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ 1235 (8*sizeof(long))) 1236static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS]; 1237 1238static char *no_auto = ""; 1239 1240module_param(no_auto, charp, 0444); 1241MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined"); 1242 1243static int virtio_ccw_check_autoonline(struct ccw_device *cdev) 1244{ 1245 struct ccw_dev_id id; 1246 1247 ccw_device_get_id(cdev, &id); 1248 if (test_bit(id.devno, devs_no_auto[id.ssid])) 1249 return 0; 1250 return 1; 1251} 1252 1253static void virtio_ccw_auto_online(void *data, async_cookie_t cookie) 1254{ 1255 struct ccw_device *cdev = data; 1256 int ret; 1257 1258 ret = ccw_device_set_online(cdev); 1259 if (ret) 1260 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret); 1261} 1262 1263static int virtio_ccw_probe(struct ccw_device *cdev) 1264{ 1265 cdev->handler = virtio_ccw_int_handler; 1266 1267 if (virtio_ccw_check_autoonline(cdev)) 1268 async_schedule(virtio_ccw_auto_online, cdev); 1269 return 0; 1270} 1271 1272static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev) 1273{ 1274 unsigned long flags; 1275 struct virtio_ccw_device *vcdev; 1276 1277 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1278 vcdev = dev_get_drvdata(&cdev->dev); 1279 if (!vcdev || vcdev->going_away) { 1280 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1281 return NULL; 1282 } 1283 vcdev->going_away = true; 1284 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1285 return vcdev; 1286} 1287 1288static void virtio_ccw_remove(struct ccw_device *cdev) 1289{ 1290 unsigned long flags; 1291 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1292 1293 if (vcdev && cdev->online) { 1294 if (vcdev->device_lost) 1295 virtio_break_device(&vcdev->vdev); 1296 unregister_virtio_device(&vcdev->vdev); 1297 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1298 dev_set_drvdata(&cdev->dev, NULL); 1299 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1300 } 1301 cdev->handler = NULL; 1302} 1303 1304static int virtio_ccw_offline(struct ccw_device *cdev) 1305{ 1306 unsigned long flags; 1307 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); 1308 1309 if (!vcdev) 1310 return 0; 1311 if (vcdev->device_lost) 1312 virtio_break_device(&vcdev->vdev); 1313 unregister_virtio_device(&vcdev->vdev); 1314 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1315 dev_set_drvdata(&cdev->dev, NULL); 1316 cdev->dev.dma_parms = NULL; 1317 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1318 return 0; 1319} 1320 1321static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev) 1322{ 1323 struct virtio_rev_info *rev; 1324 struct ccw1 *ccw; 1325 int ret; 1326 1327 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL); 1328 if (!ccw) 1329 return -ENOMEM; 1330 rev = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*rev), &ccw->cda); 1331 if (!rev) { 1332 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 1333 return -ENOMEM; 1334 } 1335 1336 /* Set transport revision */ 1337 ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV; 1338 ccw->flags = 0; 1339 ccw->count = sizeof(*rev); 1340 1341 vcdev->revision = VIRTIO_CCW_REV_MAX; 1342 do { 1343 rev->revision = vcdev->revision; 1344 /* none of our supported revisions carry payload */ 1345 rev->length = 0; 1346 ret = ccw_io_helper(vcdev, ccw, 1347 VIRTIO_CCW_DOING_SET_VIRTIO_REV); 1348 if (ret == -EOPNOTSUPP) { 1349 if (vcdev->revision == 0) 1350 /* 1351 * The host device does not support setting 1352 * the revision: let's operate it in legacy 1353 * mode. 1354 */ 1355 ret = 0; 1356 else 1357 vcdev->revision--; 1358 } 1359 } while (ret == -EOPNOTSUPP); 1360 1361 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); 1362 ccw_device_dma_free(vcdev->cdev, rev, sizeof(*rev)); 1363 return ret; 1364} 1365 1366static int virtio_ccw_online(struct ccw_device *cdev) 1367{ 1368 int ret; 1369 struct virtio_ccw_device *vcdev; 1370 unsigned long flags; 1371 1372 vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL); 1373 if (!vcdev) { 1374 dev_warn(&cdev->dev, "Could not get memory for virtio\n"); 1375 ret = -ENOMEM; 1376 goto out_free; 1377 } 1378 vcdev->vdev.dev.parent = &cdev->dev; 1379 vcdev->cdev = cdev; 1380 cdev->dev.dma_parms = &vcdev->dma_parms; 1381 vcdev->dma_area = ccw_device_dma_zalloc(vcdev->cdev, 1382 sizeof(*vcdev->dma_area), 1383 &vcdev->dma_area_addr); 1384 if (!vcdev->dma_area) { 1385 ret = -ENOMEM; 1386 goto out_free; 1387 } 1388 1389 vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */ 1390 1391 vcdev->vdev.dev.release = virtio_ccw_release_dev; 1392 vcdev->vdev.config = &virtio_ccw_config_ops; 1393 init_waitqueue_head(&vcdev->wait_q); 1394 INIT_LIST_HEAD(&vcdev->virtqueues); 1395 spin_lock_init(&vcdev->lock); 1396 rwlock_init(&vcdev->irq_lock); 1397 mutex_init(&vcdev->io_lock); 1398 1399 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1400 dev_set_drvdata(&cdev->dev, vcdev); 1401 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1402 vcdev->vdev.id.vendor = cdev->id.cu_type; 1403 vcdev->vdev.id.device = cdev->id.cu_model; 1404 1405 ret = virtio_ccw_set_transport_rev(vcdev); 1406 if (ret) 1407 goto out_free; 1408 1409 ret = register_virtio_device(&vcdev->vdev); 1410 if (ret) { 1411 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n", 1412 ret); 1413 goto out_put; 1414 } 1415 return 0; 1416out_put: 1417 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1418 dev_set_drvdata(&cdev->dev, NULL); 1419 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1420 put_device(&vcdev->vdev.dev); 1421 return ret; 1422out_free: 1423 if (vcdev) { 1424 ccw_device_dma_free(vcdev->cdev, vcdev->dma_area, 1425 sizeof(*vcdev->dma_area)); 1426 } 1427 kfree(vcdev); 1428 return ret; 1429} 1430 1431static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event) 1432{ 1433 int rc; 1434 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); 1435 1436 /* 1437 * Make sure vcdev is set 1438 * i.e. set_offline/remove callback not already running 1439 */ 1440 if (!vcdev) 1441 return NOTIFY_DONE; 1442 1443 switch (event) { 1444 case CIO_GONE: 1445 vcdev->device_lost = true; 1446 rc = NOTIFY_DONE; 1447 break; 1448 case CIO_OPER: 1449 rc = NOTIFY_OK; 1450 break; 1451 default: 1452 rc = NOTIFY_DONE; 1453 break; 1454 } 1455 return rc; 1456} 1457 1458static struct ccw_device_id virtio_ids[] = { 1459 { CCW_DEVICE(0x3832, 0) }, 1460 {}, 1461}; 1462 1463static struct ccw_driver virtio_ccw_driver = { 1464 .driver = { 1465 .owner = THIS_MODULE, 1466 .name = "virtio_ccw", 1467 }, 1468 .ids = virtio_ids, 1469 .probe = virtio_ccw_probe, 1470 .remove = virtio_ccw_remove, 1471 .set_offline = virtio_ccw_offline, 1472 .set_online = virtio_ccw_online, 1473 .notify = virtio_ccw_cio_notify, 1474 .int_class = IRQIO_VIR, 1475}; 1476 1477static int __init pure_hex(char **cp, unsigned int *val, int min_digit, 1478 int max_digit, int max_val) 1479{ 1480 int diff; 1481 1482 diff = 0; 1483 *val = 0; 1484 1485 while (diff <= max_digit) { 1486 int value = hex_to_bin(**cp); 1487 1488 if (value < 0) 1489 break; 1490 *val = *val * 16 + value; 1491 (*cp)++; 1492 diff++; 1493 } 1494 1495 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) 1496 return 1; 1497 1498 return 0; 1499} 1500 1501static int __init parse_busid(char *str, unsigned int *cssid, 1502 unsigned int *ssid, unsigned int *devno) 1503{ 1504 char *str_work; 1505 int rc, ret; 1506 1507 rc = 1; 1508 1509 if (*str == '\0') 1510 goto out; 1511 1512 str_work = str; 1513 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); 1514 if (ret || (str_work[0] != '.')) 1515 goto out; 1516 str_work++; 1517 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); 1518 if (ret || (str_work[0] != '.')) 1519 goto out; 1520 str_work++; 1521 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); 1522 if (ret || (str_work[0] != '\0')) 1523 goto out; 1524 1525 rc = 0; 1526out: 1527 return rc; 1528} 1529 1530static void __init no_auto_parse(void) 1531{ 1532 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; 1533 char *parm, *str; 1534 int rc; 1535 1536 str = no_auto; 1537 while ((parm = strsep(&str, ","))) { 1538 rc = parse_busid(strsep(&parm, "-"), &from_cssid, 1539 &from_ssid, &from); 1540 if (rc) 1541 continue; 1542 if (parm != NULL) { 1543 rc = parse_busid(parm, &to_cssid, 1544 &to_ssid, &to); 1545 if ((from_ssid > to_ssid) || 1546 ((from_ssid == to_ssid) && (from > to))) 1547 rc = -EINVAL; 1548 } else { 1549 to_cssid = from_cssid; 1550 to_ssid = from_ssid; 1551 to = from; 1552 } 1553 if (rc) 1554 continue; 1555 while ((from_ssid < to_ssid) || 1556 ((from_ssid == to_ssid) && (from <= to))) { 1557 set_bit(from, devs_no_auto[from_ssid]); 1558 from++; 1559 if (from > __MAX_SUBCHANNEL) { 1560 from_ssid++; 1561 from = 0; 1562 } 1563 } 1564 } 1565} 1566 1567static int __init virtio_ccw_init(void) 1568{ 1569 int rc; 1570 1571 /* parse no_auto string before we do anything further */ 1572 no_auto_parse(); 1573 1574 summary_indicators = cio_dma_zalloc(MAX_AIRQ_AREAS); 1575 if (!summary_indicators) 1576 return -ENOMEM; 1577 rc = ccw_driver_register(&virtio_ccw_driver); 1578 if (rc) 1579 cio_dma_free(summary_indicators, MAX_AIRQ_AREAS); 1580 return rc; 1581} 1582device_initcall(virtio_ccw_init);
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