1 /* 2 * AGPGART driver frontend 3 * Copyright (C) 2004 Silicon Graphics, Inc. 4 * Copyright (C) 2002-2003 Dave Jones 5 * Copyright (C) 1999 Jeff Hartmann 6 * Copyright (C) 1999 Precision Insight, Inc. 7 * Copyright (C) 1999 Xi Graphics, Inc. 8 * 9 * Permission is hereby granted, free of charge, to any person obtaining a 10 * copy of this software and associated documentation files (the "Software"), 11 * to deal in the Software without restriction, including without limitation 12 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 13 * and/or sell copies of the Software, and to permit persons to whom the 14 * Software is furnished to do so, subject to the following conditions: 15 * 16 * The above copyright notice and this permission notice shall be included 17 * in all copies or substantial portions of the Software. 18 * 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 22 * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM, 23 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 24 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE 25 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 26 * 27 */ 28 29 #include <linux/types.h> 30 #include <linux/kernel.h> 31 #include <linux/module.h> 32 #include <linux/mman.h> 33 #include <linux/pci.h> 34 #include <linux/miscdevice.h> 35 #include <linux/agp_backend.h> 36 #include <linux/agpgart.h> 37 #include <linux/slab.h> 38 #include <linux/mm.h> 39 #include <linux/fs.h> 40 #include <linux/sched.h> 41 #include <linux/uaccess.h> 42 #include <asm/pgtable.h> 43 #include "agp.h" 44 45 struct agp_front_data agp_fe; 46 47 struct agp_memory *agp_find_mem_by_key(int key) 48 { 49 struct agp_memory *curr; 50 51 if (agp_fe.current_controller == NULL) 52 return NULL; 53 54 curr = agp_fe.current_controller->pool; 55 56 while (curr != NULL) { 57 if (curr->key == key) 58 break; 59 curr = curr->next; 60 } 61 62 DBG("key=%d -> mem=%p", key, curr); 63 return curr; 64 } 65 66 static void agp_remove_from_pool(struct agp_memory *temp) 67 { 68 struct agp_memory *prev; 69 struct agp_memory *next; 70 71 /* Check to see if this is even in the memory pool */ 72 73 DBG("mem=%p", temp); 74 if (agp_find_mem_by_key(temp->key) != NULL) { 75 next = temp->next; 76 prev = temp->prev; 77 78 if (prev != NULL) { 79 prev->next = next; 80 if (next != NULL) 81 next->prev = prev; 82 83 } else { 84 /* This is the first item on the list */ 85 if (next != NULL) 86 next->prev = NULL; 87 88 agp_fe.current_controller->pool = next; 89 } 90 } 91 } 92 93 /* 94 * Routines for managing each client's segment list - 95 * These routines handle adding and removing segments 96 * to each auth'ed client. 97 */ 98 99 static struct 100 agp_segment_priv *agp_find_seg_in_client(const struct agp_client *client, 101 unsigned long offset, 102 int size, pgprot_t page_prot) 103 { 104 struct agp_segment_priv *seg; 105 int i; 106 off_t pg_start; 107 size_t pg_count; 108 109 pg_start = offset / 4096; 110 pg_count = size / 4096; 111 seg = *(client->segments); 112 113 for (i = 0; i < client->num_segments; i++) { 114 if ((seg[i].pg_start == pg_start) && 115 (seg[i].pg_count == pg_count) && 116 (pgprot_val(seg[i].prot) == pgprot_val(page_prot))) { 117 return seg + i; 118 } 119 } 120 121 return NULL; 122 } 123 124 static void agp_remove_seg_from_client(struct agp_client *client) 125 { 126 DBG("client=%p", client); 127 128 if (client->segments != NULL) { 129 if (*(client->segments) != NULL) { 130 DBG("Freeing %p from client %p", *(client->segments), client); 131 kfree(*(client->segments)); 132 } 133 DBG("Freeing %p from client %p", client->segments, client); 134 kfree(client->segments); 135 client->segments = NULL; 136 } 137 } 138 139 static void agp_add_seg_to_client(struct agp_client *client, 140 struct agp_segment_priv ** seg, int num_segments) 141 { 142 struct agp_segment_priv **prev_seg; 143 144 prev_seg = client->segments; 145 146 if (prev_seg != NULL) 147 agp_remove_seg_from_client(client); 148 149 DBG("Adding seg %p (%d segments) to client %p", seg, num_segments, client); 150 client->num_segments = num_segments; 151 client->segments = seg; 152 } 153 154 static pgprot_t agp_convert_mmap_flags(int prot) 155 { 156 unsigned long prot_bits; 157 158 prot_bits = calc_vm_prot_bits(prot, 0) | VM_SHARED; 159 return vm_get_page_prot(prot_bits); 160 } 161 162 int agp_create_segment(struct agp_client *client, struct agp_region *region) 163 { 164 struct agp_segment_priv **ret_seg; 165 struct agp_segment_priv *seg; 166 struct agp_segment *user_seg; 167 size_t i; 168 169 seg = kzalloc((sizeof(struct agp_segment_priv) * region->seg_count), GFP_KERNEL); 170 if (seg == NULL) { 171 kfree(region->seg_list); 172 region->seg_list = NULL; 173 return -ENOMEM; 174 } 175 user_seg = region->seg_list; 176 177 for (i = 0; i < region->seg_count; i++) { 178 seg[i].pg_start = user_seg[i].pg_start; 179 seg[i].pg_count = user_seg[i].pg_count; 180 seg[i].prot = agp_convert_mmap_flags(user_seg[i].prot); 181 } 182 kfree(region->seg_list); 183 region->seg_list = NULL; 184 185 ret_seg = kmalloc(sizeof(void *), GFP_KERNEL); 186 if (ret_seg == NULL) { 187 kfree(seg); 188 return -ENOMEM; 189 } 190 *ret_seg = seg; 191 agp_add_seg_to_client(client, ret_seg, region->seg_count); 192 return 0; 193 } 194 195 /* End - Routines for managing each client's segment list */ 196 197 /* This function must only be called when current_controller != NULL */ 198 static void agp_insert_into_pool(struct agp_memory * temp) 199 { 200 struct agp_memory *prev; 201 202 prev = agp_fe.current_controller->pool; 203 204 if (prev != NULL) { 205 prev->prev = temp; 206 temp->next = prev; 207 } 208 agp_fe.current_controller->pool = temp; 209 } 210 211 212 /* File private list routines */ 213 214 struct agp_file_private *agp_find_private(pid_t pid) 215 { 216 struct agp_file_private *curr; 217 218 curr = agp_fe.file_priv_list; 219 220 while (curr != NULL) { 221 if (curr->my_pid == pid) 222 return curr; 223 curr = curr->next; 224 } 225 226 return NULL; 227 } 228 229 static void agp_insert_file_private(struct agp_file_private * priv) 230 { 231 struct agp_file_private *prev; 232 233 prev = agp_fe.file_priv_list; 234 235 if (prev != NULL) 236 prev->prev = priv; 237 priv->next = prev; 238 agp_fe.file_priv_list = priv; 239 } 240 241 static void agp_remove_file_private(struct agp_file_private * priv) 242 { 243 struct agp_file_private *next; 244 struct agp_file_private *prev; 245 246 next = priv->next; 247 prev = priv->prev; 248 249 if (prev != NULL) { 250 prev->next = next; 251 252 if (next != NULL) 253 next->prev = prev; 254 255 } else { 256 if (next != NULL) 257 next->prev = NULL; 258 259 agp_fe.file_priv_list = next; 260 } 261 } 262 263 /* End - File flag list routines */ 264 265 /* 266 * Wrappers for agp_free_memory & agp_allocate_memory 267 * These make sure that internal lists are kept updated. 268 */ 269 void agp_free_memory_wrap(struct agp_memory *memory) 270 { 271 agp_remove_from_pool(memory); 272 agp_free_memory(memory); 273 } 274 275 struct agp_memory *agp_allocate_memory_wrap(size_t pg_count, u32 type) 276 { 277 struct agp_memory *memory; 278 279 memory = agp_allocate_memory(agp_bridge, pg_count, type); 280 if (memory == NULL) 281 return NULL; 282 283 agp_insert_into_pool(memory); 284 return memory; 285 } 286 287 /* Routines for managing the list of controllers - 288 * These routines manage the current controller, and the list of 289 * controllers 290 */ 291 292 static struct agp_controller *agp_find_controller_by_pid(pid_t id) 293 { 294 struct agp_controller *controller; 295 296 controller = agp_fe.controllers; 297 298 while (controller != NULL) { 299 if (controller->pid == id) 300 return controller; 301 controller = controller->next; 302 } 303 304 return NULL; 305 } 306 307 static struct agp_controller *agp_create_controller(pid_t id) 308 { 309 struct agp_controller *controller; 310 311 controller = kzalloc(sizeof(struct agp_controller), GFP_KERNEL); 312 if (controller == NULL) 313 return NULL; 314 315 controller->pid = id; 316 return controller; 317 } 318 319 static int agp_insert_controller(struct agp_controller *controller) 320 { 321 struct agp_controller *prev_controller; 322 323 prev_controller = agp_fe.controllers; 324 controller->next = prev_controller; 325 326 if (prev_controller != NULL) 327 prev_controller->prev = controller; 328 329 agp_fe.controllers = controller; 330 331 return 0; 332 } 333 334 static void agp_remove_all_clients(struct agp_controller *controller) 335 { 336 struct agp_client *client; 337 struct agp_client *temp; 338 339 client = controller->clients; 340 341 while (client) { 342 struct agp_file_private *priv; 343 344 temp = client; 345 agp_remove_seg_from_client(temp); 346 priv = agp_find_private(temp->pid); 347 348 if (priv != NULL) { 349 clear_bit(AGP_FF_IS_VALID, &priv->access_flags); 350 clear_bit(AGP_FF_IS_CLIENT, &priv->access_flags); 351 } 352 client = client->next; 353 kfree(temp); 354 } 355 } 356 357 static void agp_remove_all_memory(struct agp_controller *controller) 358 { 359 struct agp_memory *memory; 360 struct agp_memory *temp; 361 362 memory = controller->pool; 363 364 while (memory) { 365 temp = memory; 366 memory = memory->next; 367 agp_free_memory_wrap(temp); 368 } 369 } 370 371 static int agp_remove_controller(struct agp_controller *controller) 372 { 373 struct agp_controller *prev_controller; 374 struct agp_controller *next_controller; 375 376 prev_controller = controller->prev; 377 next_controller = controller->next; 378 379 if (prev_controller != NULL) { 380 prev_controller->next = next_controller; 381 if (next_controller != NULL) 382 next_controller->prev = prev_controller; 383 384 } else { 385 if (next_controller != NULL) 386 next_controller->prev = NULL; 387 388 agp_fe.controllers = next_controller; 389 } 390 391 agp_remove_all_memory(controller); 392 agp_remove_all_clients(controller); 393 394 if (agp_fe.current_controller == controller) { 395 agp_fe.current_controller = NULL; 396 agp_fe.backend_acquired = false; 397 agp_backend_release(agp_bridge); 398 } 399 kfree(controller); 400 return 0; 401 } 402 403 static void agp_controller_make_current(struct agp_controller *controller) 404 { 405 struct agp_client *clients; 406 407 clients = controller->clients; 408 409 while (clients != NULL) { 410 struct agp_file_private *priv; 411 412 priv = agp_find_private(clients->pid); 413 414 if (priv != NULL) { 415 set_bit(AGP_FF_IS_VALID, &priv->access_flags); 416 set_bit(AGP_FF_IS_CLIENT, &priv->access_flags); 417 } 418 clients = clients->next; 419 } 420 421 agp_fe.current_controller = controller; 422 } 423 424 static void agp_controller_release_current(struct agp_controller *controller, 425 struct agp_file_private *controller_priv) 426 { 427 struct agp_client *clients; 428 429 clear_bit(AGP_FF_IS_VALID, &controller_priv->access_flags); 430 clients = controller->clients; 431 432 while (clients != NULL) { 433 struct agp_file_private *priv; 434 435 priv = agp_find_private(clients->pid); 436 437 if (priv != NULL) 438 clear_bit(AGP_FF_IS_VALID, &priv->access_flags); 439 440 clients = clients->next; 441 } 442 443 agp_fe.current_controller = NULL; 444 agp_fe.used_by_controller = false; 445 agp_backend_release(agp_bridge); 446 } 447 448 /* 449 * Routines for managing client lists - 450 * These routines are for managing the list of auth'ed clients. 451 */ 452 453 static struct agp_client 454 *agp_find_client_in_controller(struct agp_controller *controller, pid_t id) 455 { 456 struct agp_client *client; 457 458 if (controller == NULL) 459 return NULL; 460 461 client = controller->clients; 462 463 while (client != NULL) { 464 if (client->pid == id) 465 return client; 466 client = client->next; 467 } 468 469 return NULL; 470 } 471 472 static struct agp_controller *agp_find_controller_for_client(pid_t id) 473 { 474 struct agp_controller *controller; 475 476 controller = agp_fe.controllers; 477 478 while (controller != NULL) { 479 if ((agp_find_client_in_controller(controller, id)) != NULL) 480 return controller; 481 controller = controller->next; 482 } 483 484 return NULL; 485 } 486 487 struct agp_client *agp_find_client_by_pid(pid_t id) 488 { 489 struct agp_client *temp; 490 491 if (agp_fe.current_controller == NULL) 492 return NULL; 493 494 temp = agp_find_client_in_controller(agp_fe.current_controller, id); 495 return temp; 496 } 497 498 static void agp_insert_client(struct agp_client *client) 499 { 500 struct agp_client *prev_client; 501 502 prev_client = agp_fe.current_controller->clients; 503 client->next = prev_client; 504 505 if (prev_client != NULL) 506 prev_client->prev = client; 507 508 agp_fe.current_controller->clients = client; 509 agp_fe.current_controller->num_clients++; 510 } 511 512 struct agp_client *agp_create_client(pid_t id) 513 { 514 struct agp_client *new_client; 515 516 new_client = kzalloc(sizeof(struct agp_client), GFP_KERNEL); 517 if (new_client == NULL) 518 return NULL; 519 520 new_client->pid = id; 521 agp_insert_client(new_client); 522 return new_client; 523 } 524 525 int agp_remove_client(pid_t id) 526 { 527 struct agp_client *client; 528 struct agp_client *prev_client; 529 struct agp_client *next_client; 530 struct agp_controller *controller; 531 532 controller = agp_find_controller_for_client(id); 533 if (controller == NULL) 534 return -EINVAL; 535 536 client = agp_find_client_in_controller(controller, id); 537 if (client == NULL) 538 return -EINVAL; 539 540 prev_client = client->prev; 541 next_client = client->next; 542 543 if (prev_client != NULL) { 544 prev_client->next = next_client; 545 if (next_client != NULL) 546 next_client->prev = prev_client; 547 548 } else { 549 if (next_client != NULL) 550 next_client->prev = NULL; 551 controller->clients = next_client; 552 } 553 554 controller->num_clients--; 555 agp_remove_seg_from_client(client); 556 kfree(client); 557 return 0; 558 } 559 560 /* End - Routines for managing client lists */ 561 562 /* File Operations */ 563 564 static int agp_mmap(struct file *file, struct vm_area_struct *vma) 565 { 566 unsigned int size, current_size; 567 unsigned long offset; 568 struct agp_client *client; 569 struct agp_file_private *priv = file->private_data; 570 struct agp_kern_info kerninfo; 571 572 mutex_lock(&(agp_fe.agp_mutex)); 573 574 if (agp_fe.backend_acquired != true) 575 goto out_eperm; 576 577 if (!(test_bit(AGP_FF_IS_VALID, &priv->access_flags))) 578 goto out_eperm; 579 580 agp_copy_info(agp_bridge, &kerninfo); 581 size = vma->vm_end - vma->vm_start; 582 current_size = kerninfo.aper_size; 583 current_size = current_size * 0x100000; 584 offset = vma->vm_pgoff << PAGE_SHIFT; 585 DBG("%lx:%lx", offset, offset+size); 586 587 if (test_bit(AGP_FF_IS_CLIENT, &priv->access_flags)) { 588 if ((size + offset) > current_size) 589 goto out_inval; 590 591 client = agp_find_client_by_pid(current->pid); 592 593 if (client == NULL) 594 goto out_eperm; 595 596 if (!agp_find_seg_in_client(client, offset, size, vma->vm_page_prot)) 597 goto out_inval; 598 599 DBG("client vm_ops=%p", kerninfo.vm_ops); 600 if (kerninfo.vm_ops) { 601 vma->vm_ops = kerninfo.vm_ops; 602 } else if (io_remap_pfn_range(vma, vma->vm_start, 603 (kerninfo.aper_base + offset) >> PAGE_SHIFT, 604 size, 605 pgprot_writecombine(vma->vm_page_prot))) { 606 goto out_again; 607 } 608 mutex_unlock(&(agp_fe.agp_mutex)); 609 return 0; 610 } 611 612 if (test_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags)) { 613 if (size != current_size) 614 goto out_inval; 615 616 DBG("controller vm_ops=%p", kerninfo.vm_ops); 617 if (kerninfo.vm_ops) { 618 vma->vm_ops = kerninfo.vm_ops; 619 } else if (io_remap_pfn_range(vma, vma->vm_start, 620 kerninfo.aper_base >> PAGE_SHIFT, 621 size, 622 pgprot_writecombine(vma->vm_page_prot))) { 623 goto out_again; 624 } 625 mutex_unlock(&(agp_fe.agp_mutex)); 626 return 0; 627 } 628 629 out_eperm: 630 mutex_unlock(&(agp_fe.agp_mutex)); 631 return -EPERM; 632 633 out_inval: 634 mutex_unlock(&(agp_fe.agp_mutex)); 635 return -EINVAL; 636 637 out_again: 638 mutex_unlock(&(agp_fe.agp_mutex)); 639 return -EAGAIN; 640 } 641 642 static int agp_release(struct inode *inode, struct file *file) 643 { 644 struct agp_file_private *priv = file->private_data; 645 646 mutex_lock(&(agp_fe.agp_mutex)); 647 648 DBG("priv=%p", priv); 649 650 if (test_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags)) { 651 struct agp_controller *controller; 652 653 controller = agp_find_controller_by_pid(priv->my_pid); 654 655 if (controller != NULL) { 656 if (controller == agp_fe.current_controller) 657 agp_controller_release_current(controller, priv); 658 agp_remove_controller(controller); 659 controller = NULL; 660 } 661 } 662 663 if (test_bit(AGP_FF_IS_CLIENT, &priv->access_flags)) 664 agp_remove_client(priv->my_pid); 665 666 agp_remove_file_private(priv); 667 kfree(priv); 668 file->private_data = NULL; 669 mutex_unlock(&(agp_fe.agp_mutex)); 670 return 0; 671 } 672 673 static int agp_open(struct inode *inode, struct file *file) 674 { 675 int minor = iminor(inode); 676 struct agp_file_private *priv; 677 struct agp_client *client; 678 679 if (minor != AGPGART_MINOR) 680 return -ENXIO; 681 682 mutex_lock(&(agp_fe.agp_mutex)); 683 684 priv = kzalloc(sizeof(struct agp_file_private), GFP_KERNEL); 685 if (priv == NULL) { 686 mutex_unlock(&(agp_fe.agp_mutex)); 687 return -ENOMEM; 688 } 689 690 set_bit(AGP_FF_ALLOW_CLIENT, &priv->access_flags); 691 priv->my_pid = current->pid; 692 693 if (capable(CAP_SYS_RAWIO)) 694 /* Root priv, can be controller */ 695 set_bit(AGP_FF_ALLOW_CONTROLLER, &priv->access_flags); 696 697 client = agp_find_client_by_pid(current->pid); 698 699 if (client != NULL) { 700 set_bit(AGP_FF_IS_CLIENT, &priv->access_flags); 701 set_bit(AGP_FF_IS_VALID, &priv->access_flags); 702 } 703 file->private_data = (void *) priv; 704 agp_insert_file_private(priv); 705 DBG("private=%p, client=%p", priv, client); 706 707 mutex_unlock(&(agp_fe.agp_mutex)); 708 709 return 0; 710 } 711 712 static int agpioc_info_wrap(struct agp_file_private *priv, void __user *arg) 713 { 714 struct agp_info userinfo; 715 struct agp_kern_info kerninfo; 716 717 agp_copy_info(agp_bridge, &kerninfo); 718 719 memset(&userinfo, 0, sizeof(userinfo)); 720 userinfo.version.major = kerninfo.version.major; 721 userinfo.version.minor = kerninfo.version.minor; 722 userinfo.bridge_id = kerninfo.device->vendor | 723 (kerninfo.device->device << 16); 724 userinfo.agp_mode = kerninfo.mode; 725 userinfo.aper_base = kerninfo.aper_base; 726 userinfo.aper_size = kerninfo.aper_size; 727 userinfo.pg_total = userinfo.pg_system = kerninfo.max_memory; 728 userinfo.pg_used = kerninfo.current_memory; 729 730 if (copy_to_user(arg, &userinfo, sizeof(struct agp_info))) 731 return -EFAULT; 732 733 return 0; 734 } 735 736 int agpioc_acquire_wrap(struct agp_file_private *priv) 737 { 738 struct agp_controller *controller; 739 740 DBG(""); 741 742 if (!(test_bit(AGP_FF_ALLOW_CONTROLLER, &priv->access_flags))) 743 return -EPERM; 744 745 if (agp_fe.current_controller != NULL) 746 return -EBUSY; 747 748 if (!agp_bridge) 749 return -ENODEV; 750 751 if (atomic_read(&agp_bridge->agp_in_use)) 752 return -EBUSY; 753 754 atomic_inc(&agp_bridge->agp_in_use); 755 756 agp_fe.backend_acquired = true; 757 758 controller = agp_find_controller_by_pid(priv->my_pid); 759 760 if (controller != NULL) { 761 agp_controller_make_current(controller); 762 } else { 763 controller = agp_create_controller(priv->my_pid); 764 765 if (controller == NULL) { 766 agp_fe.backend_acquired = false; 767 agp_backend_release(agp_bridge); 768 return -ENOMEM; 769 } 770 agp_insert_controller(controller); 771 agp_controller_make_current(controller); 772 } 773 774 set_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags); 775 set_bit(AGP_FF_IS_VALID, &priv->access_flags); 776 return 0; 777 } 778 779 int agpioc_release_wrap(struct agp_file_private *priv) 780 { 781 DBG(""); 782 agp_controller_release_current(agp_fe.current_controller, priv); 783 return 0; 784 } 785 786 int agpioc_setup_wrap(struct agp_file_private *priv, void __user *arg) 787 { 788 struct agp_setup mode; 789 790 DBG(""); 791 if (copy_from_user(&mode, arg, sizeof(struct agp_setup))) 792 return -EFAULT; 793 794 agp_enable(agp_bridge, mode.agp_mode); 795 return 0; 796 } 797 798 static int agpioc_reserve_wrap(struct agp_file_private *priv, void __user *arg) 799 { 800 struct agp_region reserve; 801 struct agp_client *client; 802 struct agp_file_private *client_priv; 803 804 DBG(""); 805 if (copy_from_user(&reserve, arg, sizeof(struct agp_region))) 806 return -EFAULT; 807 808 if ((unsigned) reserve.seg_count >= ~0U/sizeof(struct agp_segment)) 809 return -EFAULT; 810 811 client = agp_find_client_by_pid(reserve.pid); 812 813 if (reserve.seg_count == 0) { 814 /* remove a client */ 815 client_priv = agp_find_private(reserve.pid); 816 817 if (client_priv != NULL) { 818 set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags); 819 set_bit(AGP_FF_IS_VALID, &client_priv->access_flags); 820 } 821 if (client == NULL) { 822 /* client is already removed */ 823 return 0; 824 } 825 return agp_remove_client(reserve.pid); 826 } else { 827 struct agp_segment *segment; 828 829 if (reserve.seg_count >= 16384) 830 return -EINVAL; 831 832 segment = kmalloc((sizeof(struct agp_segment) * reserve.seg_count), 833 GFP_KERNEL); 834 835 if (segment == NULL) 836 return -ENOMEM; 837 838 if (copy_from_user(segment, (void __user *) reserve.seg_list, 839 sizeof(struct agp_segment) * reserve.seg_count)) { 840 kfree(segment); 841 return -EFAULT; 842 } 843 reserve.seg_list = segment; 844 845 if (client == NULL) { 846 /* Create the client and add the segment */ 847 client = agp_create_client(reserve.pid); 848 849 if (client == NULL) { 850 kfree(segment); 851 return -ENOMEM; 852 } 853 client_priv = agp_find_private(reserve.pid); 854 855 if (client_priv != NULL) { 856 set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags); 857 set_bit(AGP_FF_IS_VALID, &client_priv->access_flags); 858 } 859 } 860 return agp_create_segment(client, &reserve); 861 } 862 /* Will never really happen */ 863 return -EINVAL; 864 } 865 866 int agpioc_protect_wrap(struct agp_file_private *priv) 867 { 868 DBG(""); 869 /* This function is not currently implemented */ 870 return -EINVAL; 871 } 872 873 static int agpioc_allocate_wrap(struct agp_file_private *priv, void __user *arg) 874 { 875 struct agp_memory *memory; 876 struct agp_allocate alloc; 877 878 DBG(""); 879 if (copy_from_user(&alloc, arg, sizeof(struct agp_allocate))) 880 return -EFAULT; 881 882 if (alloc.type >= AGP_USER_TYPES) 883 return -EINVAL; 884 885 memory = agp_allocate_memory_wrap(alloc.pg_count, alloc.type); 886 887 if (memory == NULL) 888 return -ENOMEM; 889 890 alloc.key = memory->key; 891 alloc.physical = memory->physical; 892 893 if (copy_to_user(arg, &alloc, sizeof(struct agp_allocate))) { 894 agp_free_memory_wrap(memory); 895 return -EFAULT; 896 } 897 return 0; 898 } 899 900 int agpioc_deallocate_wrap(struct agp_file_private *priv, int arg) 901 { 902 struct agp_memory *memory; 903 904 DBG(""); 905 memory = agp_find_mem_by_key(arg); 906 907 if (memory == NULL) 908 return -EINVAL; 909 910 agp_free_memory_wrap(memory); 911 return 0; 912 } 913 914 static int agpioc_bind_wrap(struct agp_file_private *priv, void __user *arg) 915 { 916 struct agp_bind bind_info; 917 struct agp_memory *memory; 918 919 DBG(""); 920 if (copy_from_user(&bind_info, arg, sizeof(struct agp_bind))) 921 return -EFAULT; 922 923 memory = agp_find_mem_by_key(bind_info.key); 924 925 if (memory == NULL) 926 return -EINVAL; 927 928 return agp_bind_memory(memory, bind_info.pg_start); 929 } 930 931 static int agpioc_unbind_wrap(struct agp_file_private *priv, void __user *arg) 932 { 933 struct agp_memory *memory; 934 struct agp_unbind unbind; 935 936 DBG(""); 937 if (copy_from_user(&unbind, arg, sizeof(struct agp_unbind))) 938 return -EFAULT; 939 940 memory = agp_find_mem_by_key(unbind.key); 941 942 if (memory == NULL) 943 return -EINVAL; 944 945 return agp_unbind_memory(memory); 946 } 947 948 static long agp_ioctl(struct file *file, 949 unsigned int cmd, unsigned long arg) 950 { 951 struct agp_file_private *curr_priv = file->private_data; 952 int ret_val = -ENOTTY; 953 954 DBG("priv=%p, cmd=%x", curr_priv, cmd); 955 mutex_lock(&(agp_fe.agp_mutex)); 956 957 if ((agp_fe.current_controller == NULL) && 958 (cmd != AGPIOC_ACQUIRE)) { 959 ret_val = -EINVAL; 960 goto ioctl_out; 961 } 962 if ((agp_fe.backend_acquired != true) && 963 (cmd != AGPIOC_ACQUIRE)) { 964 ret_val = -EBUSY; 965 goto ioctl_out; 966 } 967 if (cmd != AGPIOC_ACQUIRE) { 968 if (!(test_bit(AGP_FF_IS_CONTROLLER, &curr_priv->access_flags))) { 969 ret_val = -EPERM; 970 goto ioctl_out; 971 } 972 /* Use the original pid of the controller, 973 * in case it's threaded */ 974 975 if (agp_fe.current_controller->pid != curr_priv->my_pid) { 976 ret_val = -EBUSY; 977 goto ioctl_out; 978 } 979 } 980 981 switch (cmd) { 982 case AGPIOC_INFO: 983 ret_val = agpioc_info_wrap(curr_priv, (void __user *) arg); 984 break; 985 986 case AGPIOC_ACQUIRE: 987 ret_val = agpioc_acquire_wrap(curr_priv); 988 break; 989 990 case AGPIOC_RELEASE: 991 ret_val = agpioc_release_wrap(curr_priv); 992 break; 993 994 case AGPIOC_SETUP: 995 ret_val = agpioc_setup_wrap(curr_priv, (void __user *) arg); 996 break; 997 998 case AGPIOC_RESERVE: 999 ret_val = agpioc_reserve_wrap(curr_priv, (void __user *) arg); 1000 break; 1001 1002 case AGPIOC_PROTECT: 1003 ret_val = agpioc_protect_wrap(curr_priv); 1004 break; 1005 1006 case AGPIOC_ALLOCATE: 1007 ret_val = agpioc_allocate_wrap(curr_priv, (void __user *) arg); 1008 break; 1009 1010 case AGPIOC_DEALLOCATE: 1011 ret_val = agpioc_deallocate_wrap(curr_priv, (int) arg); 1012 break; 1013 1014 case AGPIOC_BIND: 1015 ret_val = agpioc_bind_wrap(curr_priv, (void __user *) arg); 1016 break; 1017 1018 case AGPIOC_UNBIND: 1019 ret_val = agpioc_unbind_wrap(curr_priv, (void __user *) arg); 1020 break; 1021 1022 case AGPIOC_CHIPSET_FLUSH: 1023 break; 1024 } 1025 1026 ioctl_out: 1027 DBG("ioctl returns %d\n", ret_val); 1028 mutex_unlock(&(agp_fe.agp_mutex)); 1029 return ret_val; 1030 } 1031 1032 static const struct file_operations agp_fops = 1033 { 1034 .owner = THIS_MODULE, 1035 .llseek = no_llseek, 1036 .unlocked_ioctl = agp_ioctl, 1037 #ifdef CONFIG_COMPAT 1038 .compat_ioctl = compat_agp_ioctl, 1039 #endif 1040 .mmap = agp_mmap, 1041 .open = agp_open, 1042 .release = agp_release, 1043 }; 1044 1045 static struct miscdevice agp_miscdev = 1046 { 1047 .minor = AGPGART_MINOR, 1048 .name = "agpgart", 1049 .fops = &agp_fops 1050 }; 1051 1052 int agp_frontend_initialize(void) 1053 { 1054 memset(&agp_fe, 0, sizeof(struct agp_front_data)); 1055 mutex_init(&(agp_fe.agp_mutex)); 1056 1057 if (misc_register(&agp_miscdev)) { 1058 printk(KERN_ERR PFX "unable to get minor: %d\n", AGPGART_MINOR); 1059 return -EIO; 1060 } 1061 return 0; 1062 } 1063 1064 void agp_frontend_cleanup(void) 1065 { 1066 misc_deregister(&agp_miscdev); 1067 } 1068