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 * $DragonFly: src/sys/dev/agp/agp.c,v 1.30 2008/01/07 01:34:58 corecode Exp $ 28 */ 29 30 #include "opt_bus.h" 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/device.h> 35 #include <sys/conf.h> 36 #include <sys/malloc.h> 37 #include <sys/kernel.h> 38 #include <sys/bus.h> 39 #include <sys/agpio.h> 40 #include <sys/lock.h> 41 #include <sys/proc.h> 42 #include <sys/rman.h> 43 44 #include <bus/pci/pcivar.h> 45 #include <bus/pci/pcireg.h> 46 #include "agppriv.h" 47 #include "agpvar.h" 48 #include "agpreg.h" 49 50 #include <vm/vm.h> 51 #include <vm/vm_object.h> 52 #include <vm/vm_page.h> 53 #include <vm/vm_pageout.h> 54 #include <vm/pmap.h> 55 56 #include <machine/md_var.h> 57 58 MODULE_VERSION(agp, 1); 59 60 MALLOC_DEFINE(M_AGP, "agp", "AGP data structures"); 61 62 #define CDEV_MAJOR 148 63 /* agp_drv.c */ 64 static d_open_t agp_open; 65 static d_close_t agp_close; 66 static d_ioctl_t agp_ioctl; 67 static d_mmap_t agp_mmap; 68 69 static struct dev_ops agp_ops = { 70 { "agp", CDEV_MAJOR, D_TTY }, 71 .d_open = agp_open, 72 .d_close = agp_close, 73 .d_ioctl = agp_ioctl, 74 .d_mmap = agp_mmap, 75 }; 76 77 static devclass_t agp_devclass; 78 #define KDEV2DEV(kdev) devclass_get_device(agp_devclass, minor(kdev)) 79 80 /* Helper functions for implementing chipset mini drivers. */ 81 82 void 83 agp_flush_cache(void) 84 { 85 #if defined(__i386__) || defined(__amd64__) 86 wbinvd(); 87 #endif 88 } 89 90 u_int8_t 91 agp_find_caps(device_t dev) 92 { 93 int capreg; 94 95 if (pci_find_extcap(dev, PCIY_AGP, &capreg) != 0) 96 capreg = 0; 97 return (capreg); 98 } 99 100 /* 101 * Find an AGP display device (if any). 102 */ 103 static device_t 104 agp_find_display(void) 105 { 106 devclass_t pci = devclass_find("pci"); 107 device_t bus, dev = 0; 108 device_t *kids; 109 int busnum, numkids, i; 110 111 for (busnum = 0; busnum < devclass_get_maxunit(pci); busnum++) { 112 bus = devclass_get_device(pci, busnum); 113 if (!bus) 114 continue; 115 device_get_children(bus, &kids, &numkids); 116 for (i = 0; i < numkids; i++) { 117 dev = kids[i]; 118 if (pci_get_class(dev) == PCIC_DISPLAY 119 && pci_get_subclass(dev) == PCIS_DISPLAY_VGA) 120 if (agp_find_caps(dev)) { 121 kfree(kids, M_TEMP); 122 return dev; 123 } 124 125 } 126 kfree(kids, M_TEMP); 127 } 128 129 return 0; 130 } 131 132 struct agp_gatt * 133 agp_alloc_gatt(device_t dev) 134 { 135 u_int32_t apsize = AGP_GET_APERTURE(dev); 136 u_int32_t entries = apsize >> AGP_PAGE_SHIFT; 137 struct agp_gatt *gatt; 138 139 if (bootverbose) 140 device_printf(dev, 141 "allocating GATT for aperture of size %dM\n", 142 apsize / (1024*1024)); 143 144 if (entries == 0) { 145 device_printf(dev, "bad aperture size\n"); 146 return NULL; 147 } 148 149 gatt = kmalloc(sizeof(struct agp_gatt), M_AGP, M_INTWAIT); 150 gatt->ag_entries = entries; 151 gatt->ag_virtual = contigmalloc(entries * sizeof(u_int32_t), M_AGP, 152 M_WAITOK|M_ZERO, 0, ~0, PAGE_SIZE, 0); 153 if (!gatt->ag_virtual) { 154 if (bootverbose) 155 device_printf(dev, "contiguous allocation failed\n"); 156 kfree(gatt, M_AGP); 157 return 0; 158 } 159 gatt->ag_physical = vtophys((vm_offset_t) gatt->ag_virtual); 160 agp_flush_cache(); 161 162 return gatt; 163 } 164 165 void 166 agp_free_gatt(struct agp_gatt *gatt) 167 { 168 contigfree(gatt->ag_virtual, 169 gatt->ag_entries * sizeof(u_int32_t), M_AGP); 170 kfree(gatt, M_AGP); 171 } 172 173 static u_int agp_max[][2] = { 174 {0, 0}, 175 {32, 4}, 176 {64, 28}, 177 {128, 96}, 178 {256, 204}, 179 {512, 440}, 180 {1024, 942}, 181 {2048, 1920}, 182 {4096, 3932} 183 }; 184 #define agp_max_size (sizeof(agp_max) / sizeof(agp_max[0])) 185 186 /** 187 * Sets the PCI resource which represents the AGP aperture. 188 * 189 * If not called, the default AGP aperture resource of AGP_APBASE will 190 * be used. Must be called before agp_generic_attach(). 191 */ 192 void 193 agp_set_aperture_resource(device_t dev, int rid) 194 { 195 struct agp_softc *sc = device_get_softc(dev); 196 197 sc->as_aperture_rid = rid; 198 } 199 200 int 201 agp_generic_attach(device_t dev) 202 { 203 struct agp_softc *sc = device_get_softc(dev); 204 int i; 205 u_int memsize; 206 207 /* 208 * Find and map the aperture, RF_SHAREABLE for DRM but not RF_ACTIVE 209 * because the kernel doesn't need to map it. 210 */ 211 if (sc->as_aperture_rid == 0) 212 sc->as_aperture_rid = AGP_APBASE; 213 214 sc->as_aperture = bus_alloc_resource_any(dev, SYS_RES_MEMORY, 215 &sc->as_aperture_rid, RF_SHAREABLE); 216 if (!sc->as_aperture) 217 return ENOMEM; 218 219 /* 220 * Work out an upper bound for agp memory allocation. This 221 * uses a heurisitc table from the Linux driver. 222 */ 223 memsize = ptoa(Maxmem) >> 20; 224 for (i = 0; i < agp_max_size; i++) { 225 if (memsize <= agp_max[i][0]) 226 break; 227 } 228 if (i == agp_max_size) i = agp_max_size - 1; 229 sc->as_maxmem = agp_max[i][1] << 20U; 230 231 /* 232 * The lock is used to prevent re-entry to 233 * agp_generic_bind_memory() since that function can sleep. 234 */ 235 lockinit(&sc->as_lock, "agplk", 0, 0); 236 237 /* 238 * Initialise stuff for the userland device. 239 */ 240 agp_devclass = devclass_find("agp"); 241 TAILQ_INIT(&sc->as_memory); 242 sc->as_nextid = 1; 243 244 dev_ops_add(&agp_ops, -1, device_get_unit(dev)); 245 make_dev(&agp_ops, device_get_unit(dev), UID_ROOT, GID_WHEEL, 246 0600, "agpgart"); 247 248 return 0; 249 } 250 251 void 252 agp_free_cdev(device_t dev) 253 { 254 dev_ops_remove(&agp_ops, -1, device_get_unit(dev)); 255 } 256 257 void 258 agp_free_res(device_t dev) 259 { 260 struct agp_softc *sc = device_get_softc(dev); 261 262 bus_release_resource(dev, SYS_RES_MEMORY, sc->as_aperture_rid, 263 sc->as_aperture); 264 agp_flush_cache(); 265 } 266 267 int 268 agp_generic_detach(device_t dev) 269 { 270 agp_free_cdev(dev); 271 agp_free_res(dev); 272 return 0; 273 } 274 275 /** 276 * Default AGP aperture size detection which simply returns the size of 277 * the aperture's PCI resource. 278 */ 279 int 280 agp_generic_get_aperture(device_t dev) 281 { 282 struct agp_softc *sc = device_get_softc(dev); 283 284 return rman_get_size(sc->as_aperture); 285 } 286 287 /** 288 * Default AGP aperture size setting function, which simply doesn't allow 289 * changes to resource size. 290 */ 291 int 292 agp_generic_set_aperture(device_t dev, u_int32_t aperture) 293 { 294 u_int32_t current_aperture; 295 296 current_aperture = AGP_GET_APERTURE(dev); 297 if (current_aperture != aperture) 298 return EINVAL; 299 else 300 return 0; 301 } 302 303 /* 304 * This does the enable logic for v3, with the same topology 305 * restrictions as in place for v2 -- one bus, one device on the bus. 306 */ 307 static int 308 agp_v3_enable(device_t dev, device_t mdev, u_int32_t mode) 309 { 310 u_int32_t tstatus, mstatus; 311 u_int32_t command; 312 int rq, sba, fw, rate, arqsz, cal; 313 314 tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4); 315 mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4); 316 317 /* Set RQ to the min of mode, tstatus and mstatus */ 318 rq = AGP_MODE_GET_RQ(mode); 319 if (AGP_MODE_GET_RQ(tstatus) < rq) 320 rq = AGP_MODE_GET_RQ(tstatus); 321 if (AGP_MODE_GET_RQ(mstatus) < rq) 322 rq = AGP_MODE_GET_RQ(mstatus); 323 324 /* 325 * ARQSZ - Set the value to the maximum one. 326 * Don't allow the mode register to override values. 327 */ 328 arqsz = AGP_MODE_GET_ARQSZ(mode); 329 if (AGP_MODE_GET_ARQSZ(tstatus) > rq) 330 rq = AGP_MODE_GET_ARQSZ(tstatus); 331 if (AGP_MODE_GET_ARQSZ(mstatus) > rq) 332 rq = AGP_MODE_GET_ARQSZ(mstatus); 333 334 /* Calibration cycle - don't allow override by mode register */ 335 cal = AGP_MODE_GET_CAL(tstatus); 336 if (AGP_MODE_GET_CAL(mstatus) < cal) 337 cal = AGP_MODE_GET_CAL(mstatus); 338 339 /* SBA must be supported for AGP v3. */ 340 sba = 1; 341 342 /* Set FW if all three support it. */ 343 fw = (AGP_MODE_GET_FW(tstatus) 344 & AGP_MODE_GET_FW(mstatus) 345 & AGP_MODE_GET_FW(mode)); 346 347 /* Figure out the max rate */ 348 rate = (AGP_MODE_GET_RATE(tstatus) 349 & AGP_MODE_GET_RATE(mstatus) 350 & AGP_MODE_GET_RATE(mode)); 351 if (rate & AGP_MODE_V3_RATE_8x) 352 rate = AGP_MODE_V3_RATE_8x; 353 else 354 rate = AGP_MODE_V3_RATE_4x; 355 if (bootverbose) 356 device_printf(dev, "Setting AGP v3 mode %d\n", rate * 4); 357 358 pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, 0, 4); 359 360 /* Construct the new mode word and tell the hardware */ 361 command = 0; 362 command = AGP_MODE_SET_RQ(0, rq); 363 command = AGP_MODE_SET_ARQSZ(command, arqsz); 364 command = AGP_MODE_SET_CAL(command, cal); 365 command = AGP_MODE_SET_SBA(command, sba); 366 command = AGP_MODE_SET_FW(command, fw); 367 command = AGP_MODE_SET_RATE(command, rate); 368 command = AGP_MODE_SET_MODE_3(command, 1); 369 command = AGP_MODE_SET_AGP(command, 1); 370 pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4); 371 pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4); 372 373 return 0; 374 } 375 376 static int 377 agp_v2_enable(device_t dev, device_t mdev, u_int32_t mode) 378 { 379 u_int32_t tstatus, mstatus; 380 u_int32_t command; 381 int rq, sba, fw, rate; 382 383 tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4); 384 mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4); 385 386 /* Set RQ to the min of mode, tstatus and mstatus */ 387 rq = AGP_MODE_GET_RQ(mode); 388 if (AGP_MODE_GET_RQ(tstatus) < rq) 389 rq = AGP_MODE_GET_RQ(tstatus); 390 if (AGP_MODE_GET_RQ(mstatus) < rq) 391 rq = AGP_MODE_GET_RQ(mstatus); 392 393 /* Set SBA if all three can deal with SBA */ 394 sba = (AGP_MODE_GET_SBA(tstatus) 395 & AGP_MODE_GET_SBA(mstatus) 396 & AGP_MODE_GET_SBA(mode)); 397 398 /* Similar for FW */ 399 fw = (AGP_MODE_GET_FW(tstatus) 400 & AGP_MODE_GET_FW(mstatus) 401 & AGP_MODE_GET_FW(mode)); 402 403 /* Figure out the max rate */ 404 rate = (AGP_MODE_GET_RATE(tstatus) 405 & AGP_MODE_GET_RATE(mstatus) 406 & AGP_MODE_GET_RATE(mode)); 407 if (rate & AGP_MODE_V2_RATE_4x) 408 rate = AGP_MODE_V2_RATE_4x; 409 else if (rate & AGP_MODE_V2_RATE_2x) 410 rate = AGP_MODE_V2_RATE_2x; 411 else 412 rate = AGP_MODE_V2_RATE_1x; 413 if (bootverbose) 414 device_printf(dev, "Setting AGP v2 mode %d\n", rate); 415 416 /* Construct the new mode word and tell the hardware */ 417 command = 0; 418 command = AGP_MODE_SET_RQ(0, rq); 419 command = AGP_MODE_SET_SBA(command, sba); 420 command = AGP_MODE_SET_FW(command, fw); 421 command = AGP_MODE_SET_RATE(command, rate); 422 command = AGP_MODE_SET_AGP(command, 1); 423 pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4); 424 pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4); 425 426 return 0; 427 } 428 429 int 430 agp_generic_enable(device_t dev, u_int32_t mode) 431 { 432 device_t mdev = agp_find_display(); 433 u_int32_t tstatus, mstatus; 434 435 if (!mdev) { 436 AGP_DPF("can't find display\n"); 437 return ENXIO; 438 } 439 440 tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4); 441 mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4); 442 443 /* 444 * Check display and bridge for AGP v3 support. AGP v3 allows 445 * more variety in topology than v2, e.g. multiple AGP devices 446 * attached to one bridge, or multiple AGP bridges in one 447 * system. This doesn't attempt to address those situations, 448 * but should work fine for a classic single AGP slot system 449 * with AGP v3. 450 */ 451 if (AGP_MODE_GET_MODE_3(mode) && 452 AGP_MODE_GET_MODE_3(tstatus) && 453 AGP_MODE_GET_MODE_3(mstatus)) 454 return (agp_v3_enable(dev, mdev, mode)); 455 else 456 return (agp_v2_enable(dev, mdev, mode)); 457 } 458 459 struct agp_memory * 460 agp_generic_alloc_memory(device_t dev, int type, vm_size_t size) 461 { 462 struct agp_softc *sc = device_get_softc(dev); 463 struct agp_memory *mem; 464 465 if ((size & (AGP_PAGE_SIZE - 1)) != 0) 466 return 0; 467 468 if (sc->as_allocated + size > sc->as_maxmem) 469 return 0; 470 471 if (type != 0) { 472 kprintf("agp_generic_alloc_memory: unsupported type %d\n", 473 type); 474 return 0; 475 } 476 477 mem = kmalloc(sizeof *mem, M_AGP, M_INTWAIT); 478 mem->am_id = sc->as_nextid++; 479 mem->am_size = size; 480 mem->am_type = 0; 481 mem->am_obj = vm_object_allocate(OBJT_DEFAULT, atop(round_page(size))); 482 mem->am_physical = 0; 483 mem->am_offset = 0; 484 mem->am_is_bound = 0; 485 TAILQ_INSERT_TAIL(&sc->as_memory, mem, am_link); 486 sc->as_allocated += size; 487 488 return mem; 489 } 490 491 int 492 agp_generic_free_memory(device_t dev, struct agp_memory *mem) 493 { 494 struct agp_softc *sc = device_get_softc(dev); 495 496 if (mem->am_is_bound) 497 return EBUSY; 498 499 sc->as_allocated -= mem->am_size; 500 TAILQ_REMOVE(&sc->as_memory, mem, am_link); 501 vm_object_deallocate(mem->am_obj); 502 kfree(mem, M_AGP); 503 return 0; 504 } 505 506 int 507 agp_generic_bind_memory(device_t dev, struct agp_memory *mem, 508 vm_offset_t offset) 509 { 510 struct agp_softc *sc = device_get_softc(dev); 511 vm_offset_t i, j, k; 512 vm_page_t m; 513 int error; 514 515 lockmgr(&sc->as_lock, LK_EXCLUSIVE); 516 517 if (mem->am_is_bound) { 518 device_printf(dev, "memory already bound\n"); 519 lockmgr(&sc->as_lock, LK_RELEASE); 520 return EINVAL; 521 } 522 523 if (offset < 0 524 || (offset & (AGP_PAGE_SIZE - 1)) != 0 525 || offset + mem->am_size > AGP_GET_APERTURE(dev)) { 526 device_printf(dev, "binding memory at bad offset %#x,%#x,%#x\n", 527 (int) offset, (int)mem->am_size, 528 (int)AGP_GET_APERTURE(dev)); 529 kprintf("Check BIOS's aperature size vs X\n"); 530 lockmgr(&sc->as_lock, LK_RELEASE); 531 return EINVAL; 532 } 533 534 /* 535 * Bind the individual pages and flush the chipset's 536 * TLB. 537 */ 538 for (i = 0; i < mem->am_size; i += PAGE_SIZE) { 539 /* 540 * Find a page from the object and wire it 541 * down. This page will be mapped using one or more 542 * entries in the GATT (assuming that PAGE_SIZE >= 543 * AGP_PAGE_SIZE. If this is the first call to bind, 544 * the pages will be allocated and zeroed. 545 */ 546 m = vm_page_grab(mem->am_obj, OFF_TO_IDX(i), 547 VM_ALLOC_NORMAL | VM_ALLOC_ZERO | VM_ALLOC_RETRY); 548 if ((m->flags & PG_ZERO) == 0) 549 vm_page_zero_fill(m); 550 AGP_DPF("found page pa=%#x\n", VM_PAGE_TO_PHYS(m)); 551 vm_page_wire(m); 552 553 /* 554 * Install entries in the GATT, making sure that if 555 * AGP_PAGE_SIZE < PAGE_SIZE and mem->am_size is not 556 * aligned to PAGE_SIZE, we don't modify too many GATT 557 * entries. 558 */ 559 for (j = 0; j < PAGE_SIZE && i + j < mem->am_size; 560 j += AGP_PAGE_SIZE) { 561 vm_offset_t pa = VM_PAGE_TO_PHYS(m) + j; 562 AGP_DPF("binding offset %#x to pa %#x\n", 563 offset + i + j, pa); 564 error = AGP_BIND_PAGE(dev, offset + i + j, pa); 565 if (error) { 566 /* 567 * Bail out. Reverse all the mappings 568 * and unwire the pages. 569 */ 570 vm_page_wakeup(m); 571 for (k = 0; k < i + j; k += AGP_PAGE_SIZE) 572 AGP_UNBIND_PAGE(dev, offset + k); 573 for (k = 0; k <= i; k += PAGE_SIZE) { 574 m = vm_page_lookup(mem->am_obj, 575 OFF_TO_IDX(k)); 576 vm_page_unwire(m, 0); 577 } 578 lockmgr(&sc->as_lock, LK_RELEASE); 579 return error; 580 } 581 } 582 vm_page_wakeup(m); 583 } 584 585 /* 586 * Flush the cpu cache since we are providing a new mapping 587 * for these pages. 588 */ 589 agp_flush_cache(); 590 591 /* 592 * Make sure the chipset gets the new mappings. 593 */ 594 AGP_FLUSH_TLB(dev); 595 596 mem->am_offset = offset; 597 mem->am_is_bound = 1; 598 599 lockmgr(&sc->as_lock, LK_RELEASE); 600 601 return 0; 602 } 603 604 int 605 agp_generic_unbind_memory(device_t dev, struct agp_memory *mem) 606 { 607 struct agp_softc *sc = device_get_softc(dev); 608 vm_page_t m; 609 int i; 610 611 lockmgr(&sc->as_lock, LK_EXCLUSIVE); 612 613 if (!mem->am_is_bound) { 614 device_printf(dev, "memory is not bound\n"); 615 lockmgr(&sc->as_lock, LK_RELEASE); 616 return EINVAL; 617 } 618 619 620 /* 621 * Unbind the individual pages and flush the chipset's 622 * TLB. Unwire the pages so they can be swapped. 623 */ 624 for (i = 0; i < mem->am_size; i += AGP_PAGE_SIZE) 625 AGP_UNBIND_PAGE(dev, mem->am_offset + i); 626 for (i = 0; i < mem->am_size; i += PAGE_SIZE) { 627 m = vm_page_lookup(mem->am_obj, atop(i)); 628 vm_page_unwire(m, 0); 629 } 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