1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Char device for device raw access 4 * 5 * Copyright (C) 2005-2007 Kristian Hoegsberg <krh@bitplanet.net> 6 */ 7 8 #include <linux/bug.h> 9 #include <linux/compat.h> 10 #include <linux/delay.h> 11 #include <linux/device.h> 12 #include <linux/dma-mapping.h> 13 #include <linux/err.h> 14 #include <linux/errno.h> 15 #include <linux/firewire.h> 16 #include <linux/firewire-cdev.h> 17 #include <linux/idr.h> 18 #include <linux/irqflags.h> 19 #include <linux/jiffies.h> 20 #include <linux/kernel.h> 21 #include <linux/kref.h> 22 #include <linux/mm.h> 23 #include <linux/module.h> 24 #include <linux/mutex.h> 25 #include <linux/poll.h> 26 #include <linux/sched.h> /* required for linux/wait.h */ 27 #include <linux/slab.h> 28 #include <linux/spinlock.h> 29 #include <linux/string.h> 30 #include <linux/time.h> 31 #include <linux/uaccess.h> 32 #include <linux/vmalloc.h> 33 #include <linux/wait.h> 34 #include <linux/workqueue.h> 35 36 37 #include "core.h" 38 39 /* 40 * ABI version history is documented in linux/firewire-cdev.h. 41 */ 42 #define FW_CDEV_KERNEL_VERSION 5 43 #define FW_CDEV_VERSION_EVENT_REQUEST2 4 44 #define FW_CDEV_VERSION_ALLOCATE_REGION_END 4 45 #define FW_CDEV_VERSION_AUTO_FLUSH_ISO_OVERFLOW 5 46 47 struct client { 48 u32 version; 49 struct fw_device *device; 50 51 spinlock_t lock; 52 bool in_shutdown; 53 struct idr resource_idr; 54 struct list_head event_list; 55 wait_queue_head_t wait; 56 wait_queue_head_t tx_flush_wait; 57 u64 bus_reset_closure; 58 59 struct fw_iso_context *iso_context; 60 u64 iso_closure; 61 struct fw_iso_buffer buffer; 62 unsigned long vm_start; 63 bool buffer_is_mapped; 64 65 struct list_head phy_receiver_link; 66 u64 phy_receiver_closure; 67 68 struct list_head link; 69 struct kref kref; 70 }; 71 72 static inline void client_get(struct client *client) 73 { 74 kref_get(&client->kref); 75 } 76 77 static void client_release(struct kref *kref) 78 { 79 struct client *client = container_of(kref, struct client, kref); 80 81 fw_device_put(client->device); 82 kfree(client); 83 } 84 85 static void client_put(struct client *client) 86 { 87 kref_put(&client->kref, client_release); 88 } 89 90 struct client_resource; 91 typedef void (*client_resource_release_fn_t)(struct client *, 92 struct client_resource *); 93 struct client_resource { 94 client_resource_release_fn_t release; 95 int handle; 96 }; 97 98 struct address_handler_resource { 99 struct client_resource resource; 100 struct fw_address_handler handler; 101 __u64 closure; 102 struct client *client; 103 }; 104 105 struct outbound_transaction_resource { 106 struct client_resource resource; 107 struct fw_transaction transaction; 108 }; 109 110 struct inbound_transaction_resource { 111 struct client_resource resource; 112 struct fw_card *card; 113 struct fw_request *request; 114 void *data; 115 size_t length; 116 }; 117 118 struct descriptor_resource { 119 struct client_resource resource; 120 struct fw_descriptor descriptor; 121 u32 data[]; 122 }; 123 124 struct iso_resource { 125 struct client_resource resource; 126 struct client *client; 127 /* Schedule work and access todo only with client->lock held. */ 128 struct delayed_work work; 129 enum {ISO_RES_ALLOC, ISO_RES_REALLOC, ISO_RES_DEALLOC, 130 ISO_RES_ALLOC_ONCE, ISO_RES_DEALLOC_ONCE,} todo; 131 int generation; 132 u64 channels; 133 s32 bandwidth; 134 struct iso_resource_event *e_alloc, *e_dealloc; 135 }; 136 137 static void release_iso_resource(struct client *, struct client_resource *); 138 139 static void schedule_iso_resource(struct iso_resource *r, unsigned long delay) 140 { 141 client_get(r->client); 142 if (!queue_delayed_work(fw_workqueue, &r->work, delay)) 143 client_put(r->client); 144 } 145 146 static void schedule_if_iso_resource(struct client_resource *resource) 147 { 148 if (resource->release == release_iso_resource) 149 schedule_iso_resource(container_of(resource, 150 struct iso_resource, resource), 0); 151 } 152 153 /* 154 * dequeue_event() just kfree()'s the event, so the event has to be 155 * the first field in a struct XYZ_event. 156 */ 157 struct event { 158 struct { void *data; size_t size; } v[2]; 159 struct list_head link; 160 }; 161 162 struct bus_reset_event { 163 struct event event; 164 struct fw_cdev_event_bus_reset reset; 165 }; 166 167 struct outbound_transaction_event { 168 struct event event; 169 struct client *client; 170 struct outbound_transaction_resource r; 171 struct fw_cdev_event_response response; 172 }; 173 174 struct inbound_transaction_event { 175 struct event event; 176 union { 177 struct fw_cdev_event_request request; 178 struct fw_cdev_event_request2 request2; 179 } req; 180 }; 181 182 struct iso_interrupt_event { 183 struct event event; 184 struct fw_cdev_event_iso_interrupt interrupt; 185 }; 186 187 struct iso_interrupt_mc_event { 188 struct event event; 189 struct fw_cdev_event_iso_interrupt_mc interrupt; 190 }; 191 192 struct iso_resource_event { 193 struct event event; 194 struct fw_cdev_event_iso_resource iso_resource; 195 }; 196 197 struct outbound_phy_packet_event { 198 struct event event; 199 struct client *client; 200 struct fw_packet p; 201 struct fw_cdev_event_phy_packet phy_packet; 202 }; 203 204 struct inbound_phy_packet_event { 205 struct event event; 206 struct fw_cdev_event_phy_packet phy_packet; 207 }; 208 209 #ifdef CONFIG_COMPAT 210 static void __user *u64_to_uptr(u64 value) 211 { 212 if (in_compat_syscall()) 213 return compat_ptr(value); 214 else 215 return (void __user *)(unsigned long)value; 216 } 217 218 static u64 uptr_to_u64(void __user *ptr) 219 { 220 if (in_compat_syscall()) 221 return ptr_to_compat(ptr); 222 else 223 return (u64)(unsigned long)ptr; 224 } 225 #else 226 static inline void __user *u64_to_uptr(u64 value) 227 { 228 return (void __user *)(unsigned long)value; 229 } 230 231 static inline u64 uptr_to_u64(void __user *ptr) 232 { 233 return (u64)(unsigned long)ptr; 234 } 235 #endif /* CONFIG_COMPAT */ 236 237 static int fw_device_op_open(struct inode *inode, struct file *file) 238 { 239 struct fw_device *device; 240 struct client *client; 241 242 device = fw_device_get_by_devt(inode->i_rdev); 243 if (device == NULL) 244 return -ENODEV; 245 246 if (fw_device_is_shutdown(device)) { 247 fw_device_put(device); 248 return -ENODEV; 249 } 250 251 client = kzalloc(sizeof(*client), GFP_KERNEL); 252 if (client == NULL) { 253 fw_device_put(device); 254 return -ENOMEM; 255 } 256 257 client->device = device; 258 spin_lock_init(&client->lock); 259 idr_init(&client->resource_idr); 260 INIT_LIST_HEAD(&client->event_list); 261 init_waitqueue_head(&client->wait); 262 init_waitqueue_head(&client->tx_flush_wait); 263 INIT_LIST_HEAD(&client->phy_receiver_link); 264 INIT_LIST_HEAD(&client->link); 265 kref_init(&client->kref); 266 267 file->private_data = client; 268 269 return nonseekable_open(inode, file); 270 } 271 272 static void queue_event(struct client *client, struct event *event, 273 void *data0, size_t size0, void *data1, size_t size1) 274 { 275 unsigned long flags; 276 277 event->v[0].data = data0; 278 event->v[0].size = size0; 279 event->v[1].data = data1; 280 event->v[1].size = size1; 281 282 spin_lock_irqsave(&client->lock, flags); 283 if (client->in_shutdown) 284 kfree(event); 285 else 286 list_add_tail(&event->link, &client->event_list); 287 spin_unlock_irqrestore(&client->lock, flags); 288 289 wake_up_interruptible(&client->wait); 290 } 291 292 static int dequeue_event(struct client *client, 293 char __user *buffer, size_t count) 294 { 295 struct event *event; 296 size_t size, total; 297 int i, ret; 298 299 ret = wait_event_interruptible(client->wait, 300 !list_empty(&client->event_list) || 301 fw_device_is_shutdown(client->device)); 302 if (ret < 0) 303 return ret; 304 305 if (list_empty(&client->event_list) && 306 fw_device_is_shutdown(client->device)) 307 return -ENODEV; 308 309 spin_lock_irq(&client->lock); 310 event = list_first_entry(&client->event_list, struct event, link); 311 list_del(&event->link); 312 spin_unlock_irq(&client->lock); 313 314 total = 0; 315 for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) { 316 size = min(event->v[i].size, count - total); 317 if (copy_to_user(buffer + total, event->v[i].data, size)) { 318 ret = -EFAULT; 319 goto out; 320 } 321 total += size; 322 } 323 ret = total; 324 325 out: 326 kfree(event); 327 328 return ret; 329 } 330 331 static ssize_t fw_device_op_read(struct file *file, char __user *buffer, 332 size_t count, loff_t *offset) 333 { 334 struct client *client = file->private_data; 335 336 return dequeue_event(client, buffer, count); 337 } 338 339 static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event, 340 struct client *client) 341 { 342 struct fw_card *card = client->device->card; 343 344 spin_lock_irq(&card->lock); 345 346 event->closure = client->bus_reset_closure; 347 event->type = FW_CDEV_EVENT_BUS_RESET; 348 event->generation = client->device->generation; 349 event->node_id = client->device->node_id; 350 event->local_node_id = card->local_node->node_id; 351 event->bm_node_id = card->bm_node_id; 352 event->irm_node_id = card->irm_node->node_id; 353 event->root_node_id = card->root_node->node_id; 354 355 spin_unlock_irq(&card->lock); 356 } 357 358 static void for_each_client(struct fw_device *device, 359 void (*callback)(struct client *client)) 360 { 361 struct client *c; 362 363 mutex_lock(&device->client_list_mutex); 364 list_for_each_entry(c, &device->client_list, link) 365 callback(c); 366 mutex_unlock(&device->client_list_mutex); 367 } 368 369 static int schedule_reallocations(int id, void *p, void *data) 370 { 371 schedule_if_iso_resource(p); 372 373 return 0; 374 } 375 376 static void queue_bus_reset_event(struct client *client) 377 { 378 struct bus_reset_event *e; 379 380 e = kzalloc(sizeof(*e), GFP_KERNEL); 381 if (e == NULL) 382 return; 383 384 fill_bus_reset_event(&e->reset, client); 385 386 queue_event(client, &e->event, 387 &e->reset, sizeof(e->reset), NULL, 0); 388 389 spin_lock_irq(&client->lock); 390 idr_for_each(&client->resource_idr, schedule_reallocations, client); 391 spin_unlock_irq(&client->lock); 392 } 393 394 void fw_device_cdev_update(struct fw_device *device) 395 { 396 for_each_client(device, queue_bus_reset_event); 397 } 398 399 static void wake_up_client(struct client *client) 400 { 401 wake_up_interruptible(&client->wait); 402 } 403 404 void fw_device_cdev_remove(struct fw_device *device) 405 { 406 for_each_client(device, wake_up_client); 407 } 408 409 union ioctl_arg { 410 struct fw_cdev_get_info get_info; 411 struct fw_cdev_send_request send_request; 412 struct fw_cdev_allocate allocate; 413 struct fw_cdev_deallocate deallocate; 414 struct fw_cdev_send_response send_response; 415 struct fw_cdev_initiate_bus_reset initiate_bus_reset; 416 struct fw_cdev_add_descriptor add_descriptor; 417 struct fw_cdev_remove_descriptor remove_descriptor; 418 struct fw_cdev_create_iso_context create_iso_context; 419 struct fw_cdev_queue_iso queue_iso; 420 struct fw_cdev_start_iso start_iso; 421 struct fw_cdev_stop_iso stop_iso; 422 struct fw_cdev_get_cycle_timer get_cycle_timer; 423 struct fw_cdev_allocate_iso_resource allocate_iso_resource; 424 struct fw_cdev_send_stream_packet send_stream_packet; 425 struct fw_cdev_get_cycle_timer2 get_cycle_timer2; 426 struct fw_cdev_send_phy_packet send_phy_packet; 427 struct fw_cdev_receive_phy_packets receive_phy_packets; 428 struct fw_cdev_set_iso_channels set_iso_channels; 429 struct fw_cdev_flush_iso flush_iso; 430 }; 431 432 static int ioctl_get_info(struct client *client, union ioctl_arg *arg) 433 { 434 struct fw_cdev_get_info *a = &arg->get_info; 435 struct fw_cdev_event_bus_reset bus_reset; 436 unsigned long ret = 0; 437 438 client->version = a->version; 439 a->version = FW_CDEV_KERNEL_VERSION; 440 a->card = client->device->card->index; 441 442 down_read(&fw_device_rwsem); 443 444 if (a->rom != 0) { 445 size_t want = a->rom_length; 446 size_t have = client->device->config_rom_length * 4; 447 448 ret = copy_to_user(u64_to_uptr(a->rom), 449 client->device->config_rom, min(want, have)); 450 } 451 a->rom_length = client->device->config_rom_length * 4; 452 453 up_read(&fw_device_rwsem); 454 455 if (ret != 0) 456 return -EFAULT; 457 458 mutex_lock(&client->device->client_list_mutex); 459 460 client->bus_reset_closure = a->bus_reset_closure; 461 if (a->bus_reset != 0) { 462 fill_bus_reset_event(&bus_reset, client); 463 /* unaligned size of bus_reset is 36 bytes */ 464 ret = copy_to_user(u64_to_uptr(a->bus_reset), &bus_reset, 36); 465 } 466 if (ret == 0 && list_empty(&client->link)) 467 list_add_tail(&client->link, &client->device->client_list); 468 469 mutex_unlock(&client->device->client_list_mutex); 470 471 return ret ? -EFAULT : 0; 472 } 473 474 static int add_client_resource(struct client *client, 475 struct client_resource *resource, gfp_t gfp_mask) 476 { 477 bool preload = gfpflags_allow_blocking(gfp_mask); 478 unsigned long flags; 479 int ret; 480 481 if (preload) 482 idr_preload(gfp_mask); 483 spin_lock_irqsave(&client->lock, flags); 484 485 if (client->in_shutdown) 486 ret = -ECANCELED; 487 else 488 ret = idr_alloc(&client->resource_idr, resource, 0, 0, 489 GFP_NOWAIT); 490 if (ret >= 0) { 491 resource->handle = ret; 492 client_get(client); 493 schedule_if_iso_resource(resource); 494 } 495 496 spin_unlock_irqrestore(&client->lock, flags); 497 if (preload) 498 idr_preload_end(); 499 500 return ret < 0 ? ret : 0; 501 } 502 503 static int release_client_resource(struct client *client, u32 handle, 504 client_resource_release_fn_t release, 505 struct client_resource **return_resource) 506 { 507 struct client_resource *resource; 508 509 spin_lock_irq(&client->lock); 510 if (client->in_shutdown) 511 resource = NULL; 512 else 513 resource = idr_find(&client->resource_idr, handle); 514 if (resource && resource->release == release) 515 idr_remove(&client->resource_idr, handle); 516 spin_unlock_irq(&client->lock); 517 518 if (!(resource && resource->release == release)) 519 return -EINVAL; 520 521 if (return_resource) 522 *return_resource = resource; 523 else 524 resource->release(client, resource); 525 526 client_put(client); 527 528 return 0; 529 } 530 531 static void release_transaction(struct client *client, 532 struct client_resource *resource) 533 { 534 } 535 536 static void complete_transaction(struct fw_card *card, int rcode, 537 void *payload, size_t length, void *data) 538 { 539 struct outbound_transaction_event *e = data; 540 struct fw_cdev_event_response *rsp = &e->response; 541 struct client *client = e->client; 542 unsigned long flags; 543 544 if (length < rsp->length) 545 rsp->length = length; 546 if (rcode == RCODE_COMPLETE) 547 memcpy(rsp->data, payload, rsp->length); 548 549 spin_lock_irqsave(&client->lock, flags); 550 idr_remove(&client->resource_idr, e->r.resource.handle); 551 if (client->in_shutdown) 552 wake_up(&client->tx_flush_wait); 553 spin_unlock_irqrestore(&client->lock, flags); 554 555 rsp->type = FW_CDEV_EVENT_RESPONSE; 556 rsp->rcode = rcode; 557 558 /* 559 * In the case that sizeof(*rsp) doesn't align with the position of the 560 * data, and the read is short, preserve an extra copy of the data 561 * to stay compatible with a pre-2.6.27 bug. Since the bug is harmless 562 * for short reads and some apps depended on it, this is both safe 563 * and prudent for compatibility. 564 */ 565 if (rsp->length <= sizeof(*rsp) - offsetof(typeof(*rsp), data)) 566 queue_event(client, &e->event, rsp, sizeof(*rsp), 567 rsp->data, rsp->length); 568 else 569 queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length, 570 NULL, 0); 571 572 /* Drop the idr's reference */ 573 client_put(client); 574 } 575 576 static int init_request(struct client *client, 577 struct fw_cdev_send_request *request, 578 int destination_id, int speed) 579 { 580 struct outbound_transaction_event *e; 581 int ret; 582 583 if (request->tcode != TCODE_STREAM_DATA && 584 (request->length > 4096 || request->length > 512 << speed)) 585 return -EIO; 586 587 if (request->tcode == TCODE_WRITE_QUADLET_REQUEST && 588 request->length < 4) 589 return -EINVAL; 590 591 e = kmalloc(sizeof(*e) + request->length, GFP_KERNEL); 592 if (e == NULL) 593 return -ENOMEM; 594 595 e->client = client; 596 e->response.length = request->length; 597 e->response.closure = request->closure; 598 599 if (request->data && 600 copy_from_user(e->response.data, 601 u64_to_uptr(request->data), request->length)) { 602 ret = -EFAULT; 603 goto failed; 604 } 605 606 e->r.resource.release = release_transaction; 607 ret = add_client_resource(client, &e->r.resource, GFP_KERNEL); 608 if (ret < 0) 609 goto failed; 610 611 fw_send_request(client->device->card, &e->r.transaction, 612 request->tcode, destination_id, request->generation, 613 speed, request->offset, e->response.data, 614 request->length, complete_transaction, e); 615 return 0; 616 617 failed: 618 kfree(e); 619 620 return ret; 621 } 622 623 static int ioctl_send_request(struct client *client, union ioctl_arg *arg) 624 { 625 switch (arg->send_request.tcode) { 626 case TCODE_WRITE_QUADLET_REQUEST: 627 case TCODE_WRITE_BLOCK_REQUEST: 628 case TCODE_READ_QUADLET_REQUEST: 629 case TCODE_READ_BLOCK_REQUEST: 630 case TCODE_LOCK_MASK_SWAP: 631 case TCODE_LOCK_COMPARE_SWAP: 632 case TCODE_LOCK_FETCH_ADD: 633 case TCODE_LOCK_LITTLE_ADD: 634 case TCODE_LOCK_BOUNDED_ADD: 635 case TCODE_LOCK_WRAP_ADD: 636 case TCODE_LOCK_VENDOR_DEPENDENT: 637 break; 638 default: 639 return -EINVAL; 640 } 641 642 return init_request(client, &arg->send_request, client->device->node_id, 643 client->device->max_speed); 644 } 645 646 static inline bool is_fcp_request(struct fw_request *request) 647 { 648 return request == NULL; 649 } 650 651 static void release_request(struct client *client, 652 struct client_resource *resource) 653 { 654 struct inbound_transaction_resource *r = container_of(resource, 655 struct inbound_transaction_resource, resource); 656 657 if (is_fcp_request(r->request)) 658 kfree(r->data); 659 else 660 fw_send_response(r->card, r->request, RCODE_CONFLICT_ERROR); 661 662 fw_card_put(r->card); 663 kfree(r); 664 } 665 666 static void handle_request(struct fw_card *card, struct fw_request *request, 667 int tcode, int destination, int source, 668 int generation, unsigned long long offset, 669 void *payload, size_t length, void *callback_data) 670 { 671 struct address_handler_resource *handler = callback_data; 672 struct inbound_transaction_resource *r; 673 struct inbound_transaction_event *e; 674 size_t event_size0; 675 void *fcp_frame = NULL; 676 int ret; 677 678 /* card may be different from handler->client->device->card */ 679 fw_card_get(card); 680 681 r = kmalloc(sizeof(*r), GFP_ATOMIC); 682 e = kmalloc(sizeof(*e), GFP_ATOMIC); 683 if (r == NULL || e == NULL) 684 goto failed; 685 686 r->card = card; 687 r->request = request; 688 r->data = payload; 689 r->length = length; 690 691 if (is_fcp_request(request)) { 692 /* 693 * FIXME: Let core-transaction.c manage a 694 * single reference-counted copy? 695 */ 696 fcp_frame = kmemdup(payload, length, GFP_ATOMIC); 697 if (fcp_frame == NULL) 698 goto failed; 699 700 r->data = fcp_frame; 701 } 702 703 r->resource.release = release_request; 704 ret = add_client_resource(handler->client, &r->resource, GFP_ATOMIC); 705 if (ret < 0) 706 goto failed; 707 708 if (handler->client->version < FW_CDEV_VERSION_EVENT_REQUEST2) { 709 struct fw_cdev_event_request *req = &e->req.request; 710 711 if (tcode & 0x10) 712 tcode = TCODE_LOCK_REQUEST; 713 714 req->type = FW_CDEV_EVENT_REQUEST; 715 req->tcode = tcode; 716 req->offset = offset; 717 req->length = length; 718 req->handle = r->resource.handle; 719 req->closure = handler->closure; 720 event_size0 = sizeof(*req); 721 } else { 722 struct fw_cdev_event_request2 *req = &e->req.request2; 723 724 req->type = FW_CDEV_EVENT_REQUEST2; 725 req->tcode = tcode; 726 req->offset = offset; 727 req->source_node_id = source; 728 req->destination_node_id = destination; 729 req->card = card->index; 730 req->generation = generation; 731 req->length = length; 732 req->handle = r->resource.handle; 733 req->closure = handler->closure; 734 event_size0 = sizeof(*req); 735 } 736 737 queue_event(handler->client, &e->event, 738 &e->req, event_size0, r->data, length); 739 return; 740 741 failed: 742 kfree(r); 743 kfree(e); 744 kfree(fcp_frame); 745 746 if (!is_fcp_request(request)) 747 fw_send_response(card, request, RCODE_CONFLICT_ERROR); 748 749 fw_card_put(card); 750 } 751 752 static void release_address_handler(struct client *client, 753 struct client_resource *resource) 754 { 755 struct address_handler_resource *r = 756 container_of(resource, struct address_handler_resource, resource); 757 758 fw_core_remove_address_handler(&r->handler); 759 kfree(r); 760 } 761 762 static int ioctl_allocate(struct client *client, union ioctl_arg *arg) 763 { 764 struct fw_cdev_allocate *a = &arg->allocate; 765 struct address_handler_resource *r; 766 struct fw_address_region region; 767 int ret; 768 769 r = kmalloc(sizeof(*r), GFP_KERNEL); 770 if (r == NULL) 771 return -ENOMEM; 772 773 region.start = a->offset; 774 if (client->version < FW_CDEV_VERSION_ALLOCATE_REGION_END) 775 region.end = a->offset + a->length; 776 else 777 region.end = a->region_end; 778 779 r->handler.length = a->length; 780 r->handler.address_callback = handle_request; 781 r->handler.callback_data = r; 782 r->closure = a->closure; 783 r->client = client; 784 785 ret = fw_core_add_address_handler(&r->handler, ®ion); 786 if (ret < 0) { 787 kfree(r); 788 return ret; 789 } 790 a->offset = r->handler.offset; 791 792 r->resource.release = release_address_handler; 793 ret = add_client_resource(client, &r->resource, GFP_KERNEL); 794 if (ret < 0) { 795 release_address_handler(client, &r->resource); 796 return ret; 797 } 798 a->handle = r->resource.handle; 799 800 return 0; 801 } 802 803 static int ioctl_deallocate(struct client *client, union ioctl_arg *arg) 804 { 805 return release_client_resource(client, arg->deallocate.handle, 806 release_address_handler, NULL); 807 } 808 809 static int ioctl_send_response(struct client *client, union ioctl_arg *arg) 810 { 811 struct fw_cdev_send_response *a = &arg->send_response; 812 struct client_resource *resource; 813 struct inbound_transaction_resource *r; 814 int ret = 0; 815 816 if (release_client_resource(client, a->handle, 817 release_request, &resource) < 0) 818 return -EINVAL; 819 820 r = container_of(resource, struct inbound_transaction_resource, 821 resource); 822 if (is_fcp_request(r->request)) 823 goto out; 824 825 if (a->length != fw_get_response_length(r->request)) { 826 ret = -EINVAL; 827 kfree(r->request); 828 goto out; 829 } 830 if (copy_from_user(r->data, u64_to_uptr(a->data), a->length)) { 831 ret = -EFAULT; 832 kfree(r->request); 833 goto out; 834 } 835 fw_send_response(r->card, r->request, a->rcode); 836 out: 837 fw_card_put(r->card); 838 kfree(r); 839 840 return ret; 841 } 842 843 static int ioctl_initiate_bus_reset(struct client *client, union ioctl_arg *arg) 844 { 845 fw_schedule_bus_reset(client->device->card, true, 846 arg->initiate_bus_reset.type == FW_CDEV_SHORT_RESET); 847 return 0; 848 } 849 850 static void release_descriptor(struct client *client, 851 struct client_resource *resource) 852 { 853 struct descriptor_resource *r = 854 container_of(resource, struct descriptor_resource, resource); 855 856 fw_core_remove_descriptor(&r->descriptor); 857 kfree(r); 858 } 859 860 static int ioctl_add_descriptor(struct client *client, union ioctl_arg *arg) 861 { 862 struct fw_cdev_add_descriptor *a = &arg->add_descriptor; 863 struct descriptor_resource *r; 864 int ret; 865 866 /* Access policy: Allow this ioctl only on local nodes' device files. */ 867 if (!client->device->is_local) 868 return -ENOSYS; 869 870 if (a->length > 256) 871 return -EINVAL; 872 873 r = kmalloc(sizeof(*r) + a->length * 4, GFP_KERNEL); 874 if (r == NULL) 875 return -ENOMEM; 876 877 if (copy_from_user(r->data, u64_to_uptr(a->data), a->length * 4)) { 878 ret = -EFAULT; 879 goto failed; 880 } 881 882 r->descriptor.length = a->length; 883 r->descriptor.immediate = a->immediate; 884 r->descriptor.key = a->key; 885 r->descriptor.data = r->data; 886 887 ret = fw_core_add_descriptor(&r->descriptor); 888 if (ret < 0) 889 goto failed; 890 891 r->resource.release = release_descriptor; 892 ret = add_client_resource(client, &r->resource, GFP_KERNEL); 893 if (ret < 0) { 894 fw_core_remove_descriptor(&r->descriptor); 895 goto failed; 896 } 897 a->handle = r->resource.handle; 898 899 return 0; 900 failed: 901 kfree(r); 902 903 return ret; 904 } 905 906 static int ioctl_remove_descriptor(struct client *client, union ioctl_arg *arg) 907 { 908 return release_client_resource(client, arg->remove_descriptor.handle, 909 release_descriptor, NULL); 910 } 911 912 static void iso_callback(struct fw_iso_context *context, u32 cycle, 913 size_t header_length, void *header, void *data) 914 { 915 struct client *client = data; 916 struct iso_interrupt_event *e; 917 918 e = kmalloc(sizeof(*e) + header_length, GFP_ATOMIC); 919 if (e == NULL) 920 return; 921 922 e->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT; 923 e->interrupt.closure = client->iso_closure; 924 e->interrupt.cycle = cycle; 925 e->interrupt.header_length = header_length; 926 memcpy(e->interrupt.header, header, header_length); 927 queue_event(client, &e->event, &e->interrupt, 928 sizeof(e->interrupt) + header_length, NULL, 0); 929 } 930 931 static void iso_mc_callback(struct fw_iso_context *context, 932 dma_addr_t completed, void *data) 933 { 934 struct client *client = data; 935 struct iso_interrupt_mc_event *e; 936 937 e = kmalloc(sizeof(*e), GFP_ATOMIC); 938 if (e == NULL) 939 return; 940 941 e->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT_MULTICHANNEL; 942 e->interrupt.closure = client->iso_closure; 943 e->interrupt.completed = fw_iso_buffer_lookup(&client->buffer, 944 completed); 945 queue_event(client, &e->event, &e->interrupt, 946 sizeof(e->interrupt), NULL, 0); 947 } 948 949 static enum dma_data_direction iso_dma_direction(struct fw_iso_context *context) 950 { 951 if (context->type == FW_ISO_CONTEXT_TRANSMIT) 952 return DMA_TO_DEVICE; 953 else 954 return DMA_FROM_DEVICE; 955 } 956 957 static struct fw_iso_context *fw_iso_mc_context_create(struct fw_card *card, 958 fw_iso_mc_callback_t callback, 959 void *callback_data) 960 { 961 struct fw_iso_context *ctx; 962 963 ctx = fw_iso_context_create(card, FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL, 964 0, 0, 0, NULL, callback_data); 965 if (!IS_ERR(ctx)) 966 ctx->callback.mc = callback; 967 968 return ctx; 969 } 970 971 static int ioctl_create_iso_context(struct client *client, union ioctl_arg *arg) 972 { 973 struct fw_cdev_create_iso_context *a = &arg->create_iso_context; 974 struct fw_iso_context *context; 975 union fw_iso_callback cb; 976 int ret; 977 978 BUILD_BUG_ON(FW_CDEV_ISO_CONTEXT_TRANSMIT != FW_ISO_CONTEXT_TRANSMIT || 979 FW_CDEV_ISO_CONTEXT_RECEIVE != FW_ISO_CONTEXT_RECEIVE || 980 FW_CDEV_ISO_CONTEXT_RECEIVE_MULTICHANNEL != 981 FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL); 982 983 switch (a->type) { 984 case FW_ISO_CONTEXT_TRANSMIT: 985 if (a->speed > SCODE_3200 || a->channel > 63) 986 return -EINVAL; 987 988 cb.sc = iso_callback; 989 break; 990 991 case FW_ISO_CONTEXT_RECEIVE: 992 if (a->header_size < 4 || (a->header_size & 3) || 993 a->channel > 63) 994 return -EINVAL; 995 996 cb.sc = iso_callback; 997 break; 998 999 case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL: 1000 cb.mc = iso_mc_callback; 1001 break; 1002 1003 default: 1004 return -EINVAL; 1005 } 1006 1007 if (a->type == FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL) 1008 context = fw_iso_mc_context_create(client->device->card, cb.mc, 1009 client); 1010 else 1011 context = fw_iso_context_create(client->device->card, a->type, 1012 a->channel, a->speed, 1013 a->header_size, cb.sc, client); 1014 if (IS_ERR(context)) 1015 return PTR_ERR(context); 1016 if (client->version < FW_CDEV_VERSION_AUTO_FLUSH_ISO_OVERFLOW) 1017 context->drop_overflow_headers = true; 1018 1019 /* We only support one context at this time. */ 1020 spin_lock_irq(&client->lock); 1021 if (client->iso_context != NULL) { 1022 spin_unlock_irq(&client->lock); 1023 fw_iso_context_destroy(context); 1024 1025 return -EBUSY; 1026 } 1027 if (!client->buffer_is_mapped) { 1028 ret = fw_iso_buffer_map_dma(&client->buffer, 1029 client->device->card, 1030 iso_dma_direction(context)); 1031 if (ret < 0) { 1032 spin_unlock_irq(&client->lock); 1033 fw_iso_context_destroy(context); 1034 1035 return ret; 1036 } 1037 client->buffer_is_mapped = true; 1038 } 1039 client->iso_closure = a->closure; 1040 client->iso_context = context; 1041 spin_unlock_irq(&client->lock); 1042 1043 a->handle = 0; 1044 1045 return 0; 1046 } 1047 1048 static int ioctl_set_iso_channels(struct client *client, union ioctl_arg *arg) 1049 { 1050 struct fw_cdev_set_iso_channels *a = &arg->set_iso_channels; 1051 struct fw_iso_context *ctx = client->iso_context; 1052 1053 if (ctx == NULL || a->handle != 0) 1054 return -EINVAL; 1055 1056 return fw_iso_context_set_channels(ctx, &a->channels); 1057 } 1058 1059 /* Macros for decoding the iso packet control header. */ 1060 #define GET_PAYLOAD_LENGTH(v) ((v) & 0xffff) 1061 #define GET_INTERRUPT(v) (((v) >> 16) & 0x01) 1062 #define GET_SKIP(v) (((v) >> 17) & 0x01) 1063 #define GET_TAG(v) (((v) >> 18) & 0x03) 1064 #define GET_SY(v) (((v) >> 20) & 0x0f) 1065 #define GET_HEADER_LENGTH(v) (((v) >> 24) & 0xff) 1066 1067 static int ioctl_queue_iso(struct client *client, union ioctl_arg *arg) 1068 { 1069 struct fw_cdev_queue_iso *a = &arg->queue_iso; 1070 struct fw_cdev_iso_packet __user *p, *end, *next; 1071 struct fw_iso_context *ctx = client->iso_context; 1072 unsigned long payload, buffer_end, transmit_header_bytes = 0; 1073 u32 control; 1074 int count; 1075 struct { 1076 struct fw_iso_packet packet; 1077 u8 header[256]; 1078 } u; 1079 1080 if (ctx == NULL || a->handle != 0) 1081 return -EINVAL; 1082 1083 /* 1084 * If the user passes a non-NULL data pointer, has mmap()'ed 1085 * the iso buffer, and the pointer points inside the buffer, 1086 * we setup the payload pointers accordingly. Otherwise we 1087 * set them both to 0, which will still let packets with 1088 * payload_length == 0 through. In other words, if no packets 1089 * use the indirect payload, the iso buffer need not be mapped 1090 * and the a->data pointer is ignored. 1091 */ 1092 payload = (unsigned long)a->data - client->vm_start; 1093 buffer_end = client->buffer.page_count << PAGE_SHIFT; 1094 if (a->data == 0 || client->buffer.pages == NULL || 1095 payload >= buffer_end) { 1096 payload = 0; 1097 buffer_end = 0; 1098 } 1099 1100 if (ctx->type == FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL && payload & 3) 1101 return -EINVAL; 1102 1103 p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(a->packets); 1104 1105 end = (void __user *)p + a->size; 1106 count = 0; 1107 while (p < end) { 1108 if (get_user(control, &p->control)) 1109 return -EFAULT; 1110 u.packet.payload_length = GET_PAYLOAD_LENGTH(control); 1111 u.packet.interrupt = GET_INTERRUPT(control); 1112 u.packet.skip = GET_SKIP(control); 1113 u.packet.tag = GET_TAG(control); 1114 u.packet.sy = GET_SY(control); 1115 u.packet.header_length = GET_HEADER_LENGTH(control); 1116 1117 switch (ctx->type) { 1118 case FW_ISO_CONTEXT_TRANSMIT: 1119 if (u.packet.header_length & 3) 1120 return -EINVAL; 1121 transmit_header_bytes = u.packet.header_length; 1122 break; 1123 1124 case FW_ISO_CONTEXT_RECEIVE: 1125 if (u.packet.header_length == 0 || 1126 u.packet.header_length % ctx->header_size != 0) 1127 return -EINVAL; 1128 break; 1129 1130 case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL: 1131 if (u.packet.payload_length == 0 || 1132 u.packet.payload_length & 3) 1133 return -EINVAL; 1134 break; 1135 } 1136 1137 next = (struct fw_cdev_iso_packet __user *) 1138 &p->header[transmit_header_bytes / 4]; 1139 if (next > end) 1140 return -EINVAL; 1141 if (copy_from_user 1142 (u.packet.header, p->header, transmit_header_bytes)) 1143 return -EFAULT; 1144 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT && 1145 u.packet.header_length + u.packet.payload_length > 0) 1146 return -EINVAL; 1147 if (payload + u.packet.payload_length > buffer_end) 1148 return -EINVAL; 1149 1150 if (fw_iso_context_queue(ctx, &u.packet, 1151 &client->buffer, payload)) 1152 break; 1153 1154 p = next; 1155 payload += u.packet.payload_length; 1156 count++; 1157 } 1158 fw_iso_context_queue_flush(ctx); 1159 1160 a->size -= uptr_to_u64(p) - a->packets; 1161 a->packets = uptr_to_u64(p); 1162 a->data = client->vm_start + payload; 1163 1164 return count; 1165 } 1166 1167 static int ioctl_start_iso(struct client *client, union ioctl_arg *arg) 1168 { 1169 struct fw_cdev_start_iso *a = &arg->start_iso; 1170 1171 BUILD_BUG_ON( 1172 FW_CDEV_ISO_CONTEXT_MATCH_TAG0 != FW_ISO_CONTEXT_MATCH_TAG0 || 1173 FW_CDEV_ISO_CONTEXT_MATCH_TAG1 != FW_ISO_CONTEXT_MATCH_TAG1 || 1174 FW_CDEV_ISO_CONTEXT_MATCH_TAG2 != FW_ISO_CONTEXT_MATCH_TAG2 || 1175 FW_CDEV_ISO_CONTEXT_MATCH_TAG3 != FW_ISO_CONTEXT_MATCH_TAG3 || 1176 FW_CDEV_ISO_CONTEXT_MATCH_ALL_TAGS != FW_ISO_CONTEXT_MATCH_ALL_TAGS); 1177 1178 if (client->iso_context == NULL || a->handle != 0) 1179 return -EINVAL; 1180 1181 if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE && 1182 (a->tags == 0 || a->tags > 15 || a->sync > 15)) 1183 return -EINVAL; 1184 1185 return fw_iso_context_start(client->iso_context, 1186 a->cycle, a->sync, a->tags); 1187 } 1188 1189 static int ioctl_stop_iso(struct client *client, union ioctl_arg *arg) 1190 { 1191 struct fw_cdev_stop_iso *a = &arg->stop_iso; 1192 1193 if (client->iso_context == NULL || a->handle != 0) 1194 return -EINVAL; 1195 1196 return fw_iso_context_stop(client->iso_context); 1197 } 1198 1199 static int ioctl_flush_iso(struct client *client, union ioctl_arg *arg) 1200 { 1201 struct fw_cdev_flush_iso *a = &arg->flush_iso; 1202 1203 if (client->iso_context == NULL || a->handle != 0) 1204 return -EINVAL; 1205 1206 return fw_iso_context_flush_completions(client->iso_context); 1207 } 1208 1209 static int ioctl_get_cycle_timer2(struct client *client, union ioctl_arg *arg) 1210 { 1211 struct fw_cdev_get_cycle_timer2 *a = &arg->get_cycle_timer2; 1212 struct fw_card *card = client->device->card; 1213 struct timespec64 ts = {0, 0}; 1214 u32 cycle_time; 1215 int ret = 0; 1216 1217 local_irq_disable(); 1218 1219 ret = fw_card_read_cycle_time(card, &cycle_time); 1220 if (ret < 0) 1221 goto end; 1222 1223 switch (a->clk_id) { 1224 case CLOCK_REALTIME: ktime_get_real_ts64(&ts); break; 1225 case CLOCK_MONOTONIC: ktime_get_ts64(&ts); break; 1226 case CLOCK_MONOTONIC_RAW: ktime_get_raw_ts64(&ts); break; 1227 default: 1228 ret = -EINVAL; 1229 } 1230 end: 1231 local_irq_enable(); 1232 1233 a->tv_sec = ts.tv_sec; 1234 a->tv_nsec = ts.tv_nsec; 1235 a->cycle_timer = cycle_time; 1236 1237 return ret; 1238 } 1239 1240 static int ioctl_get_cycle_timer(struct client *client, union ioctl_arg *arg) 1241 { 1242 struct fw_cdev_get_cycle_timer *a = &arg->get_cycle_timer; 1243 struct fw_cdev_get_cycle_timer2 ct2; 1244 1245 ct2.clk_id = CLOCK_REALTIME; 1246 ioctl_get_cycle_timer2(client, (union ioctl_arg *)&ct2); 1247 1248 a->local_time = ct2.tv_sec * USEC_PER_SEC + ct2.tv_nsec / NSEC_PER_USEC; 1249 a->cycle_timer = ct2.cycle_timer; 1250 1251 return 0; 1252 } 1253 1254 static void iso_resource_work(struct work_struct *work) 1255 { 1256 struct iso_resource_event *e; 1257 struct iso_resource *r = 1258 container_of(work, struct iso_resource, work.work); 1259 struct client *client = r->client; 1260 int generation, channel, bandwidth, todo; 1261 bool skip, free, success; 1262 1263 spin_lock_irq(&client->lock); 1264 generation = client->device->generation; 1265 todo = r->todo; 1266 /* Allow 1000ms grace period for other reallocations. */ 1267 if (todo == ISO_RES_ALLOC && 1268 time_before64(get_jiffies_64(), 1269 client->device->card->reset_jiffies + HZ)) { 1270 schedule_iso_resource(r, DIV_ROUND_UP(HZ, 3)); 1271 skip = true; 1272 } else { 1273 /* We could be called twice within the same generation. */ 1274 skip = todo == ISO_RES_REALLOC && 1275 r->generation == generation; 1276 } 1277 free = todo == ISO_RES_DEALLOC || 1278 todo == ISO_RES_ALLOC_ONCE || 1279 todo == ISO_RES_DEALLOC_ONCE; 1280 r->generation = generation; 1281 spin_unlock_irq(&client->lock); 1282 1283 if (skip) 1284 goto out; 1285 1286 bandwidth = r->bandwidth; 1287 1288 fw_iso_resource_manage(client->device->card, generation, 1289 r->channels, &channel, &bandwidth, 1290 todo == ISO_RES_ALLOC || 1291 todo == ISO_RES_REALLOC || 1292 todo == ISO_RES_ALLOC_ONCE); 1293 /* 1294 * Is this generation outdated already? As long as this resource sticks 1295 * in the idr, it will be scheduled again for a newer generation or at 1296 * shutdown. 1297 */ 1298 if (channel == -EAGAIN && 1299 (todo == ISO_RES_ALLOC || todo == ISO_RES_REALLOC)) 1300 goto out; 1301 1302 success = channel >= 0 || bandwidth > 0; 1303 1304 spin_lock_irq(&client->lock); 1305 /* 1306 * Transit from allocation to reallocation, except if the client 1307 * requested deallocation in the meantime. 1308 */ 1309 if (r->todo == ISO_RES_ALLOC) 1310 r->todo = ISO_RES_REALLOC; 1311 /* 1312 * Allocation or reallocation failure? Pull this resource out of the 1313 * idr and prepare for deletion, unless the client is shutting down. 1314 */ 1315 if (r->todo == ISO_RES_REALLOC && !success && 1316 !client->in_shutdown && 1317 idr_remove(&client->resource_idr, r->resource.handle)) { 1318 client_put(client); 1319 free = true; 1320 } 1321 spin_unlock_irq(&client->lock); 1322 1323 if (todo == ISO_RES_ALLOC && channel >= 0) 1324 r->channels = 1ULL << channel; 1325 1326 if (todo == ISO_RES_REALLOC && success) 1327 goto out; 1328 1329 if (todo == ISO_RES_ALLOC || todo == ISO_RES_ALLOC_ONCE) { 1330 e = r->e_alloc; 1331 r->e_alloc = NULL; 1332 } else { 1333 e = r->e_dealloc; 1334 r->e_dealloc = NULL; 1335 } 1336 e->iso_resource.handle = r->resource.handle; 1337 e->iso_resource.channel = channel; 1338 e->iso_resource.bandwidth = bandwidth; 1339 1340 queue_event(client, &e->event, 1341 &e->iso_resource, sizeof(e->iso_resource), NULL, 0); 1342 1343 if (free) { 1344 cancel_delayed_work(&r->work); 1345 kfree(r->e_alloc); 1346 kfree(r->e_dealloc); 1347 kfree(r); 1348 } 1349 out: 1350 client_put(client); 1351 } 1352 1353 static void release_iso_resource(struct client *client, 1354 struct client_resource *resource) 1355 { 1356 struct iso_resource *r = 1357 container_of(resource, struct iso_resource, resource); 1358 1359 spin_lock_irq(&client->lock); 1360 r->todo = ISO_RES_DEALLOC; 1361 schedule_iso_resource(r, 0); 1362 spin_unlock_irq(&client->lock); 1363 } 1364 1365 static int init_iso_resource(struct client *client, 1366 struct fw_cdev_allocate_iso_resource *request, int todo) 1367 { 1368 struct iso_resource_event *e1, *e2; 1369 struct iso_resource *r; 1370 int ret; 1371 1372 if ((request->channels == 0 && request->bandwidth == 0) || 1373 request->bandwidth > BANDWIDTH_AVAILABLE_INITIAL) 1374 return -EINVAL; 1375 1376 r = kmalloc(sizeof(*r), GFP_KERNEL); 1377 e1 = kmalloc(sizeof(*e1), GFP_KERNEL); 1378 e2 = kmalloc(sizeof(*e2), GFP_KERNEL); 1379 if (r == NULL || e1 == NULL || e2 == NULL) { 1380 ret = -ENOMEM; 1381 goto fail; 1382 } 1383 1384 INIT_DELAYED_WORK(&r->work, iso_resource_work); 1385 r->client = client; 1386 r->todo = todo; 1387 r->generation = -1; 1388 r->channels = request->channels; 1389 r->bandwidth = request->bandwidth; 1390 r->e_alloc = e1; 1391 r->e_dealloc = e2; 1392 1393 e1->iso_resource.closure = request->closure; 1394 e1->iso_resource.type = FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED; 1395 e2->iso_resource.closure = request->closure; 1396 e2->iso_resource.type = FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED; 1397 1398 if (todo == ISO_RES_ALLOC) { 1399 r->resource.release = release_iso_resource; 1400 ret = add_client_resource(client, &r->resource, GFP_KERNEL); 1401 if (ret < 0) 1402 goto fail; 1403 } else { 1404 r->resource.release = NULL; 1405 r->resource.handle = -1; 1406 schedule_iso_resource(r, 0); 1407 } 1408 request->handle = r->resource.handle; 1409 1410 return 0; 1411 fail: 1412 kfree(r); 1413 kfree(e1); 1414 kfree(e2); 1415 1416 return ret; 1417 } 1418 1419 static int ioctl_allocate_iso_resource(struct client *client, 1420 union ioctl_arg *arg) 1421 { 1422 return init_iso_resource(client, 1423 &arg->allocate_iso_resource, ISO_RES_ALLOC); 1424 } 1425 1426 static int ioctl_deallocate_iso_resource(struct client *client, 1427 union ioctl_arg *arg) 1428 { 1429 return release_client_resource(client, 1430 arg->deallocate.handle, release_iso_resource, NULL); 1431 } 1432 1433 static int ioctl_allocate_iso_resource_once(struct client *client, 1434 union ioctl_arg *arg) 1435 { 1436 return init_iso_resource(client, 1437 &arg->allocate_iso_resource, ISO_RES_ALLOC_ONCE); 1438 } 1439 1440 static int ioctl_deallocate_iso_resource_once(struct client *client, 1441 union ioctl_arg *arg) 1442 { 1443 return init_iso_resource(client, 1444 &arg->allocate_iso_resource, ISO_RES_DEALLOC_ONCE); 1445 } 1446 1447 /* 1448 * Returns a speed code: Maximum speed to or from this device, 1449 * limited by the device's link speed, the local node's link speed, 1450 * and all PHY port speeds between the two links. 1451 */ 1452 static int ioctl_get_speed(struct client *client, union ioctl_arg *arg) 1453 { 1454 return client->device->max_speed; 1455 } 1456 1457 static int ioctl_send_broadcast_request(struct client *client, 1458 union ioctl_arg *arg) 1459 { 1460 struct fw_cdev_send_request *a = &arg->send_request; 1461 1462 switch (a->tcode) { 1463 case TCODE_WRITE_QUADLET_REQUEST: 1464 case TCODE_WRITE_BLOCK_REQUEST: 1465 break; 1466 default: 1467 return -EINVAL; 1468 } 1469 1470 /* Security policy: Only allow accesses to Units Space. */ 1471 if (a->offset < CSR_REGISTER_BASE + CSR_CONFIG_ROM_END) 1472 return -EACCES; 1473 1474 return init_request(client, a, LOCAL_BUS | 0x3f, SCODE_100); 1475 } 1476 1477 static int ioctl_send_stream_packet(struct client *client, union ioctl_arg *arg) 1478 { 1479 struct fw_cdev_send_stream_packet *a = &arg->send_stream_packet; 1480 struct fw_cdev_send_request request; 1481 int dest; 1482 1483 if (a->speed > client->device->card->link_speed || 1484 a->length > 1024 << a->speed) 1485 return -EIO; 1486 1487 if (a->tag > 3 || a->channel > 63 || a->sy > 15) 1488 return -EINVAL; 1489 1490 dest = fw_stream_packet_destination_id(a->tag, a->channel, a->sy); 1491 request.tcode = TCODE_STREAM_DATA; 1492 request.length = a->length; 1493 request.closure = a->closure; 1494 request.data = a->data; 1495 request.generation = a->generation; 1496 1497 return init_request(client, &request, dest, a->speed); 1498 } 1499 1500 static void outbound_phy_packet_callback(struct fw_packet *packet, 1501 struct fw_card *card, int status) 1502 { 1503 struct outbound_phy_packet_event *e = 1504 container_of(packet, struct outbound_phy_packet_event, p); 1505 struct client *e_client; 1506 1507 switch (status) { 1508 /* expected: */ 1509 case ACK_COMPLETE: e->phy_packet.rcode = RCODE_COMPLETE; break; 1510 /* should never happen with PHY packets: */ 1511 case ACK_PENDING: e->phy_packet.rcode = RCODE_COMPLETE; break; 1512 case ACK_BUSY_X: 1513 case ACK_BUSY_A: 1514 case ACK_BUSY_B: e->phy_packet.rcode = RCODE_BUSY; break; 1515 case ACK_DATA_ERROR: e->phy_packet.rcode = RCODE_DATA_ERROR; break; 1516 case ACK_TYPE_ERROR: e->phy_packet.rcode = RCODE_TYPE_ERROR; break; 1517 /* stale generation; cancelled; on certain controllers: no ack */ 1518 default: e->phy_packet.rcode = status; break; 1519 } 1520 e->phy_packet.data[0] = packet->timestamp; 1521 1522 e_client = e->client; 1523 queue_event(e->client, &e->event, &e->phy_packet, 1524 sizeof(e->phy_packet) + e->phy_packet.length, NULL, 0); 1525 client_put(e_client); 1526 } 1527 1528 static int ioctl_send_phy_packet(struct client *client, union ioctl_arg *arg) 1529 { 1530 struct fw_cdev_send_phy_packet *a = &arg->send_phy_packet; 1531 struct fw_card *card = client->device->card; 1532 struct outbound_phy_packet_event *e; 1533 1534 /* Access policy: Allow this ioctl only on local nodes' device files. */ 1535 if (!client->device->is_local) 1536 return -ENOSYS; 1537 1538 e = kzalloc(sizeof(*e) + 4, GFP_KERNEL); 1539 if (e == NULL) 1540 return -ENOMEM; 1541 1542 client_get(client); 1543 e->client = client; 1544 e->p.speed = SCODE_100; 1545 e->p.generation = a->generation; 1546 e->p.header[0] = TCODE_LINK_INTERNAL << 4; 1547 e->p.header[1] = a->data[0]; 1548 e->p.header[2] = a->data[1]; 1549 e->p.header_length = 12; 1550 e->p.callback = outbound_phy_packet_callback; 1551 e->phy_packet.closure = a->closure; 1552 e->phy_packet.type = FW_CDEV_EVENT_PHY_PACKET_SENT; 1553 if (is_ping_packet(a->data)) 1554 e->phy_packet.length = 4; 1555 1556 card->driver->send_request(card, &e->p); 1557 1558 return 0; 1559 } 1560 1561 static int ioctl_receive_phy_packets(struct client *client, union ioctl_arg *arg) 1562 { 1563 struct fw_cdev_receive_phy_packets *a = &arg->receive_phy_packets; 1564 struct fw_card *card = client->device->card; 1565 1566 /* Access policy: Allow this ioctl only on local nodes' device files. */ 1567 if (!client->device->is_local) 1568 return -ENOSYS; 1569 1570 spin_lock_irq(&card->lock); 1571 1572 list_move_tail(&client->phy_receiver_link, &card->phy_receiver_list); 1573 client->phy_receiver_closure = a->closure; 1574 1575 spin_unlock_irq(&card->lock); 1576 1577 return 0; 1578 } 1579 1580 void fw_cdev_handle_phy_packet(struct fw_card *card, struct fw_packet *p) 1581 { 1582 struct client *client; 1583 struct inbound_phy_packet_event *e; 1584 unsigned long flags; 1585 1586 spin_lock_irqsave(&card->lock, flags); 1587 1588 list_for_each_entry(client, &card->phy_receiver_list, phy_receiver_link) { 1589 e = kmalloc(sizeof(*e) + 8, GFP_ATOMIC); 1590 if (e == NULL) 1591 break; 1592 1593 e->phy_packet.closure = client->phy_receiver_closure; 1594 e->phy_packet.type = FW_CDEV_EVENT_PHY_PACKET_RECEIVED; 1595 e->phy_packet.rcode = RCODE_COMPLETE; 1596 e->phy_packet.length = 8; 1597 e->phy_packet.data[0] = p->header[1]; 1598 e->phy_packet.data[1] = p->header[2]; 1599 queue_event(client, &e->event, 1600 &e->phy_packet, sizeof(e->phy_packet) + 8, NULL, 0); 1601 } 1602 1603 spin_unlock_irqrestore(&card->lock, flags); 1604 } 1605 1606 static int (* const ioctl_handlers[])(struct client *, union ioctl_arg *) = { 1607 [0x00] = ioctl_get_info, 1608 [0x01] = ioctl_send_request, 1609 [0x02] = ioctl_allocate, 1610 [0x03] = ioctl_deallocate, 1611 [0x04] = ioctl_send_response, 1612 [0x05] = ioctl_initiate_bus_reset, 1613 [0x06] = ioctl_add_descriptor, 1614 [0x07] = ioctl_remove_descriptor, 1615 [0x08] = ioctl_create_iso_context, 1616 [0x09] = ioctl_queue_iso, 1617 [0x0a] = ioctl_start_iso, 1618 [0x0b] = ioctl_stop_iso, 1619 [0x0c] = ioctl_get_cycle_timer, 1620 [0x0d] = ioctl_allocate_iso_resource, 1621 [0x0e] = ioctl_deallocate_iso_resource, 1622 [0x0f] = ioctl_allocate_iso_resource_once, 1623 [0x10] = ioctl_deallocate_iso_resource_once, 1624 [0x11] = ioctl_get_speed, 1625 [0x12] = ioctl_send_broadcast_request, 1626 [0x13] = ioctl_send_stream_packet, 1627 [0x14] = ioctl_get_cycle_timer2, 1628 [0x15] = ioctl_send_phy_packet, 1629 [0x16] = ioctl_receive_phy_packets, 1630 [0x17] = ioctl_set_iso_channels, 1631 [0x18] = ioctl_flush_iso, 1632 }; 1633 1634 static int dispatch_ioctl(struct client *client, 1635 unsigned int cmd, void __user *arg) 1636 { 1637 union ioctl_arg buffer; 1638 int ret; 1639 1640 if (fw_device_is_shutdown(client->device)) 1641 return -ENODEV; 1642 1643 if (_IOC_TYPE(cmd) != '#' || 1644 _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers) || 1645 _IOC_SIZE(cmd) > sizeof(buffer)) 1646 return -ENOTTY; 1647 1648 memset(&buffer, 0, sizeof(buffer)); 1649 1650 if (_IOC_DIR(cmd) & _IOC_WRITE) 1651 if (copy_from_user(&buffer, arg, _IOC_SIZE(cmd))) 1652 return -EFAULT; 1653 1654 ret = ioctl_handlers[_IOC_NR(cmd)](client, &buffer); 1655 if (ret < 0) 1656 return ret; 1657 1658 if (_IOC_DIR(cmd) & _IOC_READ) 1659 if (copy_to_user(arg, &buffer, _IOC_SIZE(cmd))) 1660 return -EFAULT; 1661 1662 return ret; 1663 } 1664 1665 static long fw_device_op_ioctl(struct file *file, 1666 unsigned int cmd, unsigned long arg) 1667 { 1668 return dispatch_ioctl(file->private_data, cmd, (void __user *)arg); 1669 } 1670 1671 static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma) 1672 { 1673 struct client *client = file->private_data; 1674 unsigned long size; 1675 int page_count, ret; 1676 1677 if (fw_device_is_shutdown(client->device)) 1678 return -ENODEV; 1679 1680 /* FIXME: We could support multiple buffers, but we don't. */ 1681 if (client->buffer.pages != NULL) 1682 return -EBUSY; 1683 1684 if (!(vma->vm_flags & VM_SHARED)) 1685 return -EINVAL; 1686 1687 if (vma->vm_start & ~PAGE_MASK) 1688 return -EINVAL; 1689 1690 client->vm_start = vma->vm_start; 1691 size = vma->vm_end - vma->vm_start; 1692 page_count = size >> PAGE_SHIFT; 1693 if (size & ~PAGE_MASK) 1694 return -EINVAL; 1695 1696 ret = fw_iso_buffer_alloc(&client->buffer, page_count); 1697 if (ret < 0) 1698 return ret; 1699 1700 spin_lock_irq(&client->lock); 1701 if (client->iso_context) { 1702 ret = fw_iso_buffer_map_dma(&client->buffer, 1703 client->device->card, 1704 iso_dma_direction(client->iso_context)); 1705 client->buffer_is_mapped = (ret == 0); 1706 } 1707 spin_unlock_irq(&client->lock); 1708 if (ret < 0) 1709 goto fail; 1710 1711 ret = vm_map_pages_zero(vma, client->buffer.pages, 1712 client->buffer.page_count); 1713 if (ret < 0) 1714 goto fail; 1715 1716 return 0; 1717 fail: 1718 fw_iso_buffer_destroy(&client->buffer, client->device->card); 1719 return ret; 1720 } 1721 1722 static int is_outbound_transaction_resource(int id, void *p, void *data) 1723 { 1724 struct client_resource *resource = p; 1725 1726 return resource->release == release_transaction; 1727 } 1728 1729 static int has_outbound_transactions(struct client *client) 1730 { 1731 int ret; 1732 1733 spin_lock_irq(&client->lock); 1734 ret = idr_for_each(&client->resource_idr, 1735 is_outbound_transaction_resource, NULL); 1736 spin_unlock_irq(&client->lock); 1737 1738 return ret; 1739 } 1740 1741 static int shutdown_resource(int id, void *p, void *data) 1742 { 1743 struct client_resource *resource = p; 1744 struct client *client = data; 1745 1746 resource->release(client, resource); 1747 client_put(client); 1748 1749 return 0; 1750 } 1751 1752 static int fw_device_op_release(struct inode *inode, struct file *file) 1753 { 1754 struct client *client = file->private_data; 1755 struct event *event, *next_event; 1756 1757 spin_lock_irq(&client->device->card->lock); 1758 list_del(&client->phy_receiver_link); 1759 spin_unlock_irq(&client->device->card->lock); 1760 1761 mutex_lock(&client->device->client_list_mutex); 1762 list_del(&client->link); 1763 mutex_unlock(&client->device->client_list_mutex); 1764 1765 if (client->iso_context) 1766 fw_iso_context_destroy(client->iso_context); 1767 1768 if (client->buffer.pages) 1769 fw_iso_buffer_destroy(&client->buffer, client->device->card); 1770 1771 /* Freeze client->resource_idr and client->event_list */ 1772 spin_lock_irq(&client->lock); 1773 client->in_shutdown = true; 1774 spin_unlock_irq(&client->lock); 1775 1776 wait_event(client->tx_flush_wait, !has_outbound_transactions(client)); 1777 1778 idr_for_each(&client->resource_idr, shutdown_resource, client); 1779 idr_destroy(&client->resource_idr); 1780 1781 list_for_each_entry_safe(event, next_event, &client->event_list, link) 1782 kfree(event); 1783 1784 client_put(client); 1785 1786 return 0; 1787 } 1788 1789 static __poll_t fw_device_op_poll(struct file *file, poll_table * pt) 1790 { 1791 struct client *client = file->private_data; 1792 __poll_t mask = 0; 1793 1794 poll_wait(file, &client->wait, pt); 1795 1796 if (fw_device_is_shutdown(client->device)) 1797 mask |= EPOLLHUP | EPOLLERR; 1798 if (!list_empty(&client->event_list)) 1799 mask |= EPOLLIN | EPOLLRDNORM; 1800 1801 return mask; 1802 } 1803 1804 const struct file_operations fw_device_ops = { 1805 .owner = THIS_MODULE, 1806 .llseek = no_llseek, 1807 .open = fw_device_op_open, 1808 .read = fw_device_op_read, 1809 .unlocked_ioctl = fw_device_op_ioctl, 1810 .mmap = fw_device_op_mmap, 1811 .release = fw_device_op_release, 1812 .poll = fw_device_op_poll, 1813 .compat_ioctl = compat_ptr_ioctl, 1814 }; 1815