1 /*- 2 * Copyright (c) 2000 Doug Rabson 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: src/sys/dev/agp/agp.c,v 1.58 2007/11/12 21:51:36 jhb Exp $ 27 */ 28 29 #include "opt_bus.h" 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/device.h> 34 #include <sys/conf.h> 35 #include <sys/malloc.h> 36 #include <sys/kernel.h> 37 #include <sys/bus.h> 38 #include <sys/agpio.h> 39 #include <sys/lock.h> 40 #include <sys/proc.h> 41 #include <sys/rman.h> 42 43 #include <bus/pci/pcivar.h> 44 #include <bus/pci/pcireg.h> 45 #include "agppriv.h" 46 #include "agpvar.h" 47 #include "agpreg.h" 48 49 #include <vm/vm.h> 50 #include <vm/vm_object.h> 51 #include <vm/vm_page.h> 52 #include <vm/vm_pageout.h> 53 #include <vm/pmap.h> 54 55 #include <machine/md_var.h> 56 57 MODULE_VERSION(agp, 1); 58 59 MALLOC_DEFINE(M_AGP, "agp", "AGP data structures"); 60 61 static d_open_t agp_open; 62 static d_close_t agp_close; 63 static d_ioctl_t agp_ioctl; 64 static d_mmap_t agp_mmap; 65 66 static struct dev_ops agp_ops = { 67 { "agp", 0, D_TTY }, 68 .d_open = agp_open, 69 .d_close = agp_close, 70 .d_ioctl = agp_ioctl, 71 .d_mmap = agp_mmap, 72 }; 73 74 static devclass_t agp_devclass; 75 #define KDEV2DEV(kdev) devclass_get_device(agp_devclass, minor(kdev)) 76 77 /* Helper functions for implementing chipset mini drivers. */ 78 79 void 80 agp_flush_cache(void) 81 { 82 #if defined(__i386__) || defined(__x86_64__) 83 wbinvd(); 84 #endif 85 } 86 87 u_int8_t 88 agp_find_caps(device_t dev) 89 { 90 int capreg; 91 92 if (pci_find_extcap(dev, PCIY_AGP, &capreg) != 0) 93 capreg = 0; 94 return (capreg); 95 } 96 97 /* 98 * Find an AGP display device (if any). 99 */ 100 static device_t 101 agp_find_display(void) 102 { 103 devclass_t pci = devclass_find("pci"); 104 device_t bus, dev = 0; 105 device_t *kids; 106 int busnum, numkids, i; 107 108 for (busnum = 0; busnum < devclass_get_maxunit(pci); busnum++) { 109 bus = devclass_get_device(pci, busnum); 110 if (!bus) 111 continue; 112 device_get_children(bus, &kids, &numkids); 113 for (i = 0; i < numkids; i++) { 114 dev = kids[i]; 115 if (pci_get_class(dev) == PCIC_DISPLAY 116 && pci_get_subclass(dev) == PCIS_DISPLAY_VGA) 117 if (agp_find_caps(dev)) { 118 kfree(kids, M_TEMP); 119 return dev; 120 } 121 122 } 123 kfree(kids, M_TEMP); 124 } 125 126 return 0; 127 } 128 129 struct agp_gatt * 130 agp_alloc_gatt(device_t dev) 131 { 132 u_int32_t apsize = AGP_GET_APERTURE(dev); 133 u_int32_t entries = apsize >> AGP_PAGE_SHIFT; 134 struct agp_gatt *gatt; 135 136 if (bootverbose) 137 device_printf(dev, 138 "allocating GATT for aperture of size %dM\n", 139 apsize / (1024*1024)); 140 141 if (entries == 0) { 142 device_printf(dev, "bad aperture size\n"); 143 return NULL; 144 } 145 146 gatt = kmalloc(sizeof(struct agp_gatt), M_AGP, M_INTWAIT); 147 gatt->ag_entries = entries; 148 gatt->ag_virtual = contigmalloc(entries * sizeof(u_int32_t), M_AGP, 149 M_WAITOK|M_ZERO, 0, ~0, PAGE_SIZE, 0); 150 if (!gatt->ag_virtual) { 151 if (bootverbose) 152 device_printf(dev, "contiguous allocation failed\n"); 153 kfree(gatt, M_AGP); 154 return 0; 155 } 156 gatt->ag_physical = vtophys((vm_offset_t) gatt->ag_virtual); 157 agp_flush_cache(); 158 159 return gatt; 160 } 161 162 void 163 agp_free_gatt(struct agp_gatt *gatt) 164 { 165 contigfree(gatt->ag_virtual, 166 gatt->ag_entries * sizeof(u_int32_t), M_AGP); 167 kfree(gatt, M_AGP); 168 } 169 170 static u_int agp_max[][2] = { 171 {0, 0}, 172 {32, 4}, 173 {64, 28}, 174 {128, 96}, 175 {256, 204}, 176 {512, 440}, 177 {1024, 942}, 178 {2048, 1920}, 179 {4096, 3932} 180 }; 181 #define agp_max_size NELEM(agp_max) 182 183 /** 184 * Sets the PCI resource which represents the AGP aperture. 185 * 186 * If not called, the default AGP aperture resource of AGP_APBASE will 187 * be used. Must be called before agp_generic_attach(). 188 */ 189 void 190 agp_set_aperture_resource(device_t dev, int rid) 191 { 192 struct agp_softc *sc = device_get_softc(dev); 193 194 sc->as_aperture_rid = rid; 195 } 196 197 int 198 agp_generic_attach(device_t dev) 199 { 200 struct agp_softc *sc = device_get_softc(dev); 201 int i; 202 u_int memsize; 203 204 /* 205 * Find and map the aperture, RF_SHAREABLE for DRM but not RF_ACTIVE 206 * because the kernel doesn't need to map it. 207 */ 208 if (sc->as_aperture_rid == 0) 209 sc->as_aperture_rid = AGP_APBASE; 210 211 sc->as_aperture = bus_alloc_resource_any(dev, SYS_RES_MEMORY, 212 &sc->as_aperture_rid, RF_SHAREABLE); 213 if (!sc->as_aperture) 214 return ENOMEM; 215 216 /* 217 * Work out an upper bound for agp memory allocation. This 218 * uses a heurisitc table from the Linux driver. 219 */ 220 memsize = ptoa(Maxmem) >> 20; 221 for (i = 0; i < agp_max_size; i++) { 222 if (memsize <= agp_max[i][0]) 223 break; 224 } 225 if (i == agp_max_size) i = agp_max_size - 1; 226 sc->as_maxmem = agp_max[i][1] << 20U; 227 228 /* 229 * The lock is used to prevent re-entry to 230 * agp_generic_bind_memory() since that function can sleep. 231 */ 232 lockinit(&sc->as_lock, "agplk", 0, 0); 233 234 /* 235 * Initialise stuff for the userland device. 236 */ 237 agp_devclass = devclass_find("agp"); 238 TAILQ_INIT(&sc->as_memory); 239 sc->as_nextid = 1; 240 241 make_dev(&agp_ops, device_get_unit(dev), UID_ROOT, GID_WHEEL, 242 0600, "agpgart"); 243 244 return 0; 245 } 246 247 void 248 agp_free_cdev(device_t dev) 249 { 250 dev_ops_remove_minor(&agp_ops, device_get_unit(dev)); 251 } 252 253 void 254 agp_free_res(device_t dev) 255 { 256 struct agp_softc *sc = device_get_softc(dev); 257 258 bus_release_resource(dev, SYS_RES_MEMORY, sc->as_aperture_rid, 259 sc->as_aperture); 260 agp_flush_cache(); 261 } 262 263 int 264 agp_generic_detach(device_t dev) 265 { 266 agp_free_cdev(dev); 267 agp_free_res(dev); 268 return 0; 269 } 270 271 /** 272 * Default AGP aperture size detection which simply returns the size of 273 * the aperture's PCI resource. 274 */ 275 int 276 agp_generic_get_aperture(device_t dev) 277 { 278 struct agp_softc *sc = device_get_softc(dev); 279 280 return rman_get_size(sc->as_aperture); 281 } 282 283 /** 284 * Default AGP aperture size setting function, which simply doesn't allow 285 * changes to resource size. 286 */ 287 int 288 agp_generic_set_aperture(device_t dev, u_int32_t aperture) 289 { 290 u_int32_t current_aperture; 291 292 current_aperture = AGP_GET_APERTURE(dev); 293 if (current_aperture != aperture) 294 return EINVAL; 295 else 296 return 0; 297 } 298 299 /* 300 * This does the enable logic for v3, with the same topology 301 * restrictions as in place for v2 -- one bus, one device on the bus. 302 */ 303 static int 304 agp_v3_enable(device_t dev, device_t mdev, u_int32_t mode) 305 { 306 u_int32_t tstatus, mstatus; 307 u_int32_t command; 308 int rq, sba, fw, rate, arqsz, cal; 309 310 tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4); 311 mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4); 312 313 /* Set RQ to the min of mode, tstatus and mstatus */ 314 rq = AGP_MODE_GET_RQ(mode); 315 if (AGP_MODE_GET_RQ(tstatus) < rq) 316 rq = AGP_MODE_GET_RQ(tstatus); 317 if (AGP_MODE_GET_RQ(mstatus) < rq) 318 rq = AGP_MODE_GET_RQ(mstatus); 319 320 /* 321 * ARQSZ - Set the value to the maximum one. 322 * Don't allow the mode register to override values. 323 */ 324 arqsz = AGP_MODE_GET_ARQSZ(mode); 325 if (AGP_MODE_GET_ARQSZ(tstatus) > rq) 326 rq = AGP_MODE_GET_ARQSZ(tstatus); 327 if (AGP_MODE_GET_ARQSZ(mstatus) > rq) 328 rq = AGP_MODE_GET_ARQSZ(mstatus); 329 330 /* Calibration cycle - don't allow override by mode register */ 331 cal = AGP_MODE_GET_CAL(tstatus); 332 if (AGP_MODE_GET_CAL(mstatus) < cal) 333 cal = AGP_MODE_GET_CAL(mstatus); 334 335 /* SBA must be supported for AGP v3. */ 336 sba = 1; 337 338 /* Set FW if all three support it. */ 339 fw = (AGP_MODE_GET_FW(tstatus) 340 & AGP_MODE_GET_FW(mstatus) 341 & AGP_MODE_GET_FW(mode)); 342 343 /* Figure out the max rate */ 344 rate = (AGP_MODE_GET_RATE(tstatus) 345 & AGP_MODE_GET_RATE(mstatus) 346 & AGP_MODE_GET_RATE(mode)); 347 if (rate & AGP_MODE_V3_RATE_8x) 348 rate = AGP_MODE_V3_RATE_8x; 349 else 350 rate = AGP_MODE_V3_RATE_4x; 351 if (bootverbose) 352 device_printf(dev, "Setting AGP v3 mode %d\n", rate * 4); 353 354 pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, 0, 4); 355 356 /* Construct the new mode word and tell the hardware */ 357 command = 0; 358 command = AGP_MODE_SET_RQ(0, rq); 359 command = AGP_MODE_SET_ARQSZ(command, arqsz); 360 command = AGP_MODE_SET_CAL(command, cal); 361 command = AGP_MODE_SET_SBA(command, sba); 362 command = AGP_MODE_SET_FW(command, fw); 363 command = AGP_MODE_SET_RATE(command, rate); 364 command = AGP_MODE_SET_MODE_3(command, 1); 365 command = AGP_MODE_SET_AGP(command, 1); 366 pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4); 367 pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4); 368 369 return 0; 370 } 371 372 static int 373 agp_v2_enable(device_t dev, device_t mdev, u_int32_t mode) 374 { 375 u_int32_t tstatus, mstatus; 376 u_int32_t command; 377 int rq, sba, fw, rate; 378 379 tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4); 380 mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4); 381 382 /* Set RQ to the min of mode, tstatus and mstatus */ 383 rq = AGP_MODE_GET_RQ(mode); 384 if (AGP_MODE_GET_RQ(tstatus) < rq) 385 rq = AGP_MODE_GET_RQ(tstatus); 386 if (AGP_MODE_GET_RQ(mstatus) < rq) 387 rq = AGP_MODE_GET_RQ(mstatus); 388 389 /* Set SBA if all three can deal with SBA */ 390 sba = (AGP_MODE_GET_SBA(tstatus) 391 & AGP_MODE_GET_SBA(mstatus) 392 & AGP_MODE_GET_SBA(mode)); 393 394 /* Similar for FW */ 395 fw = (AGP_MODE_GET_FW(tstatus) 396 & AGP_MODE_GET_FW(mstatus) 397 & AGP_MODE_GET_FW(mode)); 398 399 /* Figure out the max rate */ 400 rate = (AGP_MODE_GET_RATE(tstatus) 401 & AGP_MODE_GET_RATE(mstatus) 402 & AGP_MODE_GET_RATE(mode)); 403 if (rate & AGP_MODE_V2_RATE_4x) 404 rate = AGP_MODE_V2_RATE_4x; 405 else if (rate & AGP_MODE_V2_RATE_2x) 406 rate = AGP_MODE_V2_RATE_2x; 407 else 408 rate = AGP_MODE_V2_RATE_1x; 409 if (bootverbose) 410 device_printf(dev, "Setting AGP v2 mode %d\n", rate); 411 412 /* Construct the new mode word and tell the hardware */ 413 command = 0; 414 command = AGP_MODE_SET_RQ(0, rq); 415 command = AGP_MODE_SET_SBA(command, sba); 416 command = AGP_MODE_SET_FW(command, fw); 417 command = AGP_MODE_SET_RATE(command, rate); 418 command = AGP_MODE_SET_AGP(command, 1); 419 pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4); 420 pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4); 421 422 return 0; 423 } 424 425 int 426 agp_generic_enable(device_t dev, u_int32_t mode) 427 { 428 device_t mdev = agp_find_display(); 429 u_int32_t tstatus, mstatus; 430 431 if (!mdev) { 432 AGP_DPF("can't find display\n"); 433 return ENXIO; 434 } 435 436 tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4); 437 mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4); 438 439 /* 440 * Check display and bridge for AGP v3 support. AGP v3 allows 441 * more variety in topology than v2, e.g. multiple AGP devices 442 * attached to one bridge, or multiple AGP bridges in one 443 * system. This doesn't attempt to address those situations, 444 * but should work fine for a classic single AGP slot system 445 * with AGP v3. 446 */ 447 if (AGP_MODE_GET_MODE_3(mode) && 448 AGP_MODE_GET_MODE_3(tstatus) && 449 AGP_MODE_GET_MODE_3(mstatus)) 450 return (agp_v3_enable(dev, mdev, mode)); 451 else 452 return (agp_v2_enable(dev, mdev, mode)); 453 } 454 455 struct agp_memory * 456 agp_generic_alloc_memory(device_t dev, int type, vm_size_t size) 457 { 458 struct agp_softc *sc = device_get_softc(dev); 459 struct agp_memory *mem; 460 461 if ((size & (AGP_PAGE_SIZE - 1)) != 0) 462 return 0; 463 464 if (sc->as_allocated + size > sc->as_maxmem) 465 return 0; 466 467 if (type != 0) { 468 kprintf("agp_generic_alloc_memory: unsupported type %d\n", 469 type); 470 return 0; 471 } 472 473 mem = kmalloc(sizeof *mem, M_AGP, M_INTWAIT); 474 mem->am_id = sc->as_nextid++; 475 mem->am_size = size; 476 mem->am_type = 0; 477 mem->am_obj = vm_object_allocate(OBJT_DEFAULT, atop(round_page(size))); 478 mem->am_physical = 0; 479 mem->am_offset = 0; 480 mem->am_is_bound = 0; 481 TAILQ_INSERT_TAIL(&sc->as_memory, mem, am_link); 482 sc->as_allocated += size; 483 484 return mem; 485 } 486 487 int 488 agp_generic_free_memory(device_t dev, struct agp_memory *mem) 489 { 490 struct agp_softc *sc = device_get_softc(dev); 491 492 if (mem->am_is_bound) 493 return EBUSY; 494 495 sc->as_allocated -= mem->am_size; 496 TAILQ_REMOVE(&sc->as_memory, mem, am_link); 497 vm_object_deallocate(mem->am_obj); 498 kfree(mem, M_AGP); 499 return 0; 500 } 501 502 int 503 agp_generic_bind_memory(device_t dev, struct agp_memory *mem, 504 vm_offset_t offset) 505 { 506 struct agp_softc *sc = device_get_softc(dev); 507 vm_offset_t i, j, k; 508 vm_page_t m; 509 int error; 510 511 lockmgr(&sc->as_lock, LK_EXCLUSIVE); 512 513 if (mem->am_is_bound) { 514 device_printf(dev, "memory already bound\n"); 515 lockmgr(&sc->as_lock, LK_RELEASE); 516 return EINVAL; 517 } 518 519 if (offset < 0 520 || (offset & (AGP_PAGE_SIZE - 1)) != 0 521 || offset + mem->am_size > AGP_GET_APERTURE(dev)) { 522 device_printf(dev, "binding memory at bad offset %#x,%#x,%#x\n", 523 (int) offset, (int)mem->am_size, 524 (int)AGP_GET_APERTURE(dev)); 525 kprintf("Check BIOS's aperature size vs X\n"); 526 lockmgr(&sc->as_lock, LK_RELEASE); 527 return EINVAL; 528 } 529 530 /* 531 * Bind the individual pages and flush the chipset's 532 * TLB. 533 */ 534 for (i = 0; i < mem->am_size; i += PAGE_SIZE) { 535 /* 536 * Find a page from the object and wire it 537 * down. This page will be mapped using one or more 538 * entries in the GATT (assuming that PAGE_SIZE >= 539 * AGP_PAGE_SIZE. If this is the first call to bind, 540 * the pages will be allocated and zeroed. 541 */ 542 m = vm_page_grab(mem->am_obj, OFF_TO_IDX(i), 543 VM_ALLOC_NORMAL | VM_ALLOC_ZERO | VM_ALLOC_RETRY); 544 if ((m->flags & PG_ZERO) == 0) 545 vm_page_zero_fill(m); 546 AGP_DPF("found page pa=%#x\n", VM_PAGE_TO_PHYS(m)); 547 vm_page_wire(m); 548 549 /* 550 * Install entries in the GATT, making sure that if 551 * AGP_PAGE_SIZE < PAGE_SIZE and mem->am_size is not 552 * aligned to PAGE_SIZE, we don't modify too many GATT 553 * entries. 554 */ 555 for (j = 0; j < PAGE_SIZE && i + j < mem->am_size; 556 j += AGP_PAGE_SIZE) { 557 vm_offset_t pa = VM_PAGE_TO_PHYS(m) + j; 558 AGP_DPF("binding offset %#x to pa %#x\n", 559 offset + i + j, pa); 560 error = AGP_BIND_PAGE(dev, offset + i + j, pa); 561 if (error) { 562 /* 563 * Bail out. Reverse all the mappings 564 * and unwire the pages. 565 */ 566 vm_page_wakeup(m); 567 for (k = 0; k < i + j; k += AGP_PAGE_SIZE) 568 AGP_UNBIND_PAGE(dev, offset + k); 569 lwkt_gettoken(&vm_token); 570 for (k = 0; k <= i; k += PAGE_SIZE) { 571 m = vm_page_lookup(mem->am_obj, 572 OFF_TO_IDX(k)); 573 vm_page_unwire(m, 0); 574 } 575 lwkt_reltoken(&vm_token); 576 lockmgr(&sc->as_lock, LK_RELEASE); 577 return error; 578 } 579 } 580 vm_page_wakeup(m); 581 } 582 583 /* 584 * Flush the cpu cache since we are providing a new mapping 585 * for these pages. 586 */ 587 agp_flush_cache(); 588 589 /* 590 * Make sure the chipset gets the new mappings. 591 */ 592 AGP_FLUSH_TLB(dev); 593 594 mem->am_offset = offset; 595 mem->am_is_bound = 1; 596 597 lockmgr(&sc->as_lock, LK_RELEASE); 598 599 return 0; 600 } 601 602 int 603 agp_generic_unbind_memory(device_t dev, struct agp_memory *mem) 604 { 605 struct agp_softc *sc = device_get_softc(dev); 606 vm_page_t m; 607 int i; 608 609 lockmgr(&sc->as_lock, LK_EXCLUSIVE); 610 611 if (!mem->am_is_bound) { 612 device_printf(dev, "memory is not bound\n"); 613 lockmgr(&sc->as_lock, LK_RELEASE); 614 return EINVAL; 615 } 616 617 618 /* 619 * Unbind the individual pages and flush the chipset's 620 * TLB. Unwire the pages so they can be swapped. 621 */ 622 for (i = 0; i < mem->am_size; i += AGP_PAGE_SIZE) 623 AGP_UNBIND_PAGE(dev, mem->am_offset + i); 624 lwkt_gettoken(&vm_token); 625 for (i = 0; i < mem->am_size; i += PAGE_SIZE) { 626 m = vm_page_lookup(mem->am_obj, atop(i)); 627 vm_page_unwire(m, 0); 628 } 629 lwkt_reltoken(&vm_token); 630 631 agp_flush_cache(); 632 AGP_FLUSH_TLB(dev); 633 634 mem->am_offset = 0; 635 mem->am_is_bound = 0; 636 637 lockmgr(&sc->as_lock, LK_RELEASE); 638 639 return 0; 640 } 641 642 /* Helper functions for implementing user/kernel api */ 643 644 static int 645 agp_acquire_helper(device_t dev, enum agp_acquire_state state) 646 { 647 struct agp_softc *sc = device_get_softc(dev); 648 649 if (sc->as_state != AGP_ACQUIRE_FREE) 650 return EBUSY; 651 sc->as_state = state; 652 653 return 0; 654 } 655 656 static int 657 agp_release_helper(device_t dev, enum agp_acquire_state state) 658 { 659 struct agp_softc *sc = device_get_softc(dev); 660 661 if (sc->as_state == AGP_ACQUIRE_FREE) 662 return 0; 663 664 if (sc->as_state != state) 665 return EBUSY; 666 667 sc->as_state = AGP_ACQUIRE_FREE; 668 return 0; 669 } 670 671 static struct agp_memory * 672 agp_find_memory(device_t dev, int id) 673 { 674 struct agp_softc *sc = device_get_softc(dev); 675 struct agp_memory *mem; 676 677 AGP_DPF("searching for memory block %d\n", id); 678 TAILQ_FOREACH(mem, &sc->as_memory, am_link) { 679 AGP_DPF("considering memory block %d\n", mem->am_id); 680 if (mem->am_id == id) 681 return mem; 682 } 683 return 0; 684 } 685 686 /* Implementation of the userland ioctl api */ 687 688 static int 689 agp_info_user(device_t dev, agp_info *info) 690 { 691 struct agp_softc *sc = device_get_softc(dev); 692 693 bzero(info, sizeof *info); 694 info->bridge_id = pci_get_devid(dev); 695 info->agp_mode = 696 pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4); 697 info->aper_base = rman_get_start(sc->as_aperture); 698 info->aper_size = AGP_GET_APERTURE(dev) >> 20; 699 info->pg_total = info->pg_system = sc->as_maxmem >> AGP_PAGE_SHIFT; 700 info->pg_used = sc->as_allocated >> AGP_PAGE_SHIFT; 701 702 return 0; 703 } 704 705 static int 706 agp_setup_user(device_t dev, agp_setup *setup) 707 { 708 return AGP_ENABLE(dev, setup->agp_mode); 709 } 710 711 static int 712 agp_allocate_user(device_t dev, agp_allocate *alloc) 713 { 714 struct agp_memory *mem; 715 716 mem = AGP_ALLOC_MEMORY(dev, 717 alloc->type, 718 alloc->pg_count << AGP_PAGE_SHIFT); 719 if (mem) { 720 alloc->key = mem->am_id; 721 alloc->physical = mem->am_physical; 722 return 0; 723 } else { 724 return ENOMEM; 725 } 726 } 727 728 static int 729 agp_deallocate_user(device_t dev, int id) 730 { 731 struct agp_memory *mem = agp_find_memory(dev, id); 732 733 if (mem) { 734 AGP_FREE_MEMORY(dev, mem); 735 return 0; 736 } else { 737 return ENOENT; 738 } 739 } 740 741 static int 742 agp_bind_user(device_t dev, agp_bind *bind) 743 { 744 struct agp_memory *mem = agp_find_memory(dev, bind->key); 745 746 if (!mem) 747 return ENOENT; 748 749 return AGP_BIND_MEMORY(dev, mem, bind->pg_start << AGP_PAGE_SHIFT); 750 } 751 752 static int 753 agp_unbind_user(device_t dev, agp_unbind *unbind) 754 { 755 struct agp_memory *mem = agp_find_memory(dev, unbind->key); 756 757 if (!mem) 758 return ENOENT; 759 760 return AGP_UNBIND_MEMORY(dev, mem); 761 } 762 763 static int 764 agp_open(struct dev_open_args *ap) 765 { 766 cdev_t kdev = ap->a_head.a_dev; 767 device_t dev = KDEV2DEV(kdev); 768 struct agp_softc *sc = device_get_softc(dev); 769 770 if (!sc->as_isopen) { 771 sc->as_isopen = 1; 772 device_busy(dev); 773 } 774 775 return 0; 776 } 777 778 static int 779 agp_close(struct dev_close_args *ap) 780 { 781 cdev_t kdev = ap->a_head.a_dev; 782 device_t dev = KDEV2DEV(kdev); 783 struct agp_softc *sc = device_get_softc(dev); 784 struct agp_memory *mem; 785 786 /* 787 * Clear the GATT and force release on last close 788 */ 789 while ((mem = TAILQ_FIRST(&sc->as_memory)) != 0) { 790 if (mem->am_is_bound) 791 AGP_UNBIND_MEMORY(dev, mem); 792 AGP_FREE_MEMORY(dev, mem); 793 } 794 if (sc->as_state == AGP_ACQUIRE_USER) 795 agp_release_helper(dev, AGP_ACQUIRE_USER); 796 sc->as_isopen = 0; 797 device_unbusy(dev); 798 799 return 0; 800 } 801 802 static int 803 agp_ioctl(struct dev_ioctl_args *ap) 804 { 805 cdev_t kdev = ap->a_head.a_dev; 806 device_t dev = KDEV2DEV(kdev); 807 808 switch (ap->a_cmd) { 809 case AGPIOC_INFO: 810 return agp_info_user(dev, (agp_info *)ap->a_data); 811 812 case AGPIOC_ACQUIRE: 813 return agp_acquire_helper(dev, AGP_ACQUIRE_USER); 814 815 case AGPIOC_RELEASE: 816 return agp_release_helper(dev, AGP_ACQUIRE_USER); 817 818 case AGPIOC_SETUP: 819 return agp_setup_user(dev, (agp_setup *)ap->a_data); 820 821 case AGPIOC_ALLOCATE: 822 return agp_allocate_user(dev, (agp_allocate *)ap->a_data); 823 824 case AGPIOC_DEALLOCATE: 825 return agp_deallocate_user(dev, *(int *)ap->a_data); 826 827 case AGPIOC_BIND: 828 return agp_bind_user(dev, (agp_bind *)ap->a_data); 829 830 case AGPIOC_UNBIND: 831 return agp_unbind_user(dev, (agp_unbind *)ap->a_data); 832 833 } 834 835 return EINVAL; 836 } 837 838 static int 839 agp_mmap(struct dev_mmap_args *ap) 840 { 841 cdev_t kdev = ap->a_head.a_dev; 842 device_t dev = KDEV2DEV(kdev); 843 struct agp_softc *sc = device_get_softc(dev); 844 845 if (ap->a_offset > AGP_GET_APERTURE(dev)) 846 return EINVAL; 847 ap->a_result = atop(rman_get_start(sc->as_aperture) + ap->a_offset); 848 return 0; 849 } 850 851 /* Implementation of the kernel api */ 852 853 device_t 854 agp_find_device(void) 855 { 856 device_t *children, child; 857 int i, count; 858 859 if (!agp_devclass) 860 return NULL; 861 if (devclass_get_devices(agp_devclass, &children, &count) != 0) 862 return NULL; 863 child = NULL; 864 for (i = 0; i < count; i++) { 865 if (device_is_attached(children[i])) { 866 child = children[i]; 867 break; 868 } 869 } 870 kfree(children, M_TEMP); 871 return child; 872 } 873 874 enum agp_acquire_state 875 agp_state(device_t dev) 876 { 877 struct agp_softc *sc = device_get_softc(dev); 878 return sc->as_state; 879 } 880 881 void 882 agp_get_info(device_t dev, struct agp_info *info) 883 { 884 struct agp_softc *sc = device_get_softc(dev); 885 886 info->ai_mode = 887 pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4); 888 info->ai_aperture_base = rman_get_start(sc->as_aperture); 889 info->ai_aperture_size = rman_get_size(sc->as_aperture); 890 info->ai_memory_allowed = sc->as_maxmem; 891 info->ai_memory_used = sc->as_allocated; 892 } 893 894 int 895 agp_acquire(device_t dev) 896 { 897 return agp_acquire_helper(dev, AGP_ACQUIRE_KERNEL); 898 } 899 900 int 901 agp_release(device_t dev) 902 { 903 return agp_release_helper(dev, AGP_ACQUIRE_KERNEL); 904 } 905 906 int 907 agp_enable(device_t dev, u_int32_t mode) 908 { 909 return AGP_ENABLE(dev, mode); 910 } 911 912 void *agp_alloc_memory(device_t dev, int type, vm_size_t bytes) 913 { 914 return (void *) AGP_ALLOC_MEMORY(dev, type, bytes); 915 } 916 917 void agp_free_memory(device_t dev, void *handle) 918 { 919 struct agp_memory *mem = (struct agp_memory *) handle; 920 AGP_FREE_MEMORY(dev, mem); 921 } 922 923 int agp_bind_memory(device_t dev, void *handle, vm_offset_t offset) 924 { 925 struct agp_memory *mem = (struct agp_memory *) handle; 926 return AGP_BIND_MEMORY(dev, mem, offset); 927 } 928 929 int agp_unbind_memory(device_t dev, void *handle) 930 { 931 struct agp_memory *mem = (struct agp_memory *) handle; 932 return AGP_UNBIND_MEMORY(dev, mem); 933 } 934 935 void agp_memory_info(device_t dev, void *handle, struct 936 agp_memory_info *mi) 937 { 938 struct agp_memory *mem = (struct agp_memory *) handle; 939 940 mi->ami_size = mem->am_size; 941 mi->ami_physical = mem->am_physical; 942 mi->ami_offset = mem->am_offset; 943 mi->ami_is_bound = mem->am_is_bound; 944 } 945