agp.c revision 1.45
1 /* $NetBSD: agp.c,v 1.45 2007/03/04 06:02:15 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2000 Doug Rabson 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD: src/sys/pci/agp.c,v 1.12 2001/05/19 01:28:07 alfred Exp $ 29 */ 30 31 /* 32 * Copyright (c) 2001 Wasabi Systems, Inc. 33 * All rights reserved. 34 * 35 * Written by Frank van der Linden for Wasabi Systems, Inc. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed for the NetBSD Project by 48 * Wasabi Systems, Inc. 49 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 50 * or promote products derived from this software without specific prior 51 * written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 55 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 56 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 57 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 58 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 59 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 60 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 61 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 62 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 63 * POSSIBILITY OF SUCH DAMAGE. 64 */ 65 66 67 #include <sys/cdefs.h> 68 __KERNEL_RCSID(0, "$NetBSD: agp.c,v 1.45 2007/03/04 06:02:15 christos Exp $"); 69 70 #include <sys/param.h> 71 #include <sys/systm.h> 72 #include <sys/malloc.h> 73 #include <sys/kernel.h> 74 #include <sys/device.h> 75 #include <sys/conf.h> 76 #include <sys/ioctl.h> 77 #include <sys/fcntl.h> 78 #include <sys/agpio.h> 79 #include <sys/proc.h> 80 81 #include <uvm/uvm_extern.h> 82 83 #include <dev/pci/pcireg.h> 84 #include <dev/pci/pcivar.h> 85 #include <dev/pci/agpvar.h> 86 #include <dev/pci/agpreg.h> 87 #include <dev/pci/pcidevs.h> 88 89 #include <machine/bus.h> 90 91 MALLOC_DEFINE(M_AGP, "AGP", "AGP memory"); 92 93 /* Helper functions for implementing chipset mini drivers. */ 94 /* XXXfvdl get rid of this one. */ 95 96 extern struct cfdriver agp_cd; 97 98 static int agp_info_user(struct agp_softc *, agp_info *); 99 static int agp_setup_user(struct agp_softc *, agp_setup *); 100 static int agp_allocate_user(struct agp_softc *, agp_allocate *); 101 static int agp_deallocate_user(struct agp_softc *, int); 102 static int agp_bind_user(struct agp_softc *, agp_bind *); 103 static int agp_unbind_user(struct agp_softc *, agp_unbind *); 104 static int agpdev_match(struct pci_attach_args *); 105 106 #include "agp_ali.h" 107 #include "agp_amd.h" 108 #include "agp_i810.h" 109 #include "agp_intel.h" 110 #include "agp_sis.h" 111 #include "agp_via.h" 112 113 const struct agp_product { 114 uint32_t ap_vendor; 115 uint32_t ap_product; 116 int (*ap_match)(const struct pci_attach_args *); 117 int (*ap_attach)(struct device *, struct device *, void *); 118 } agp_products[] = { 119 #if NAGP_ALI > 0 120 { PCI_VENDOR_ALI, -1, 121 NULL, agp_ali_attach }, 122 #endif 123 124 #if NAGP_AMD > 0 125 { PCI_VENDOR_AMD, -1, 126 agp_amd_match, agp_amd_attach }, 127 #endif 128 129 #if NAGP_I810 > 0 130 { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82810_MCH, 131 NULL, agp_i810_attach }, 132 { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82810_DC100_MCH, 133 NULL, agp_i810_attach }, 134 { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82810E_MCH, 135 NULL, agp_i810_attach }, 136 { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82815_FULL_HUB, 137 NULL, agp_i810_attach }, 138 { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82840_HB, 139 NULL, agp_i810_attach }, 140 { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82830MP_IO_1, 141 NULL, agp_i810_attach }, 142 { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82845G_DRAM, 143 NULL, agp_i810_attach }, 144 { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82855GM_MCH, 145 NULL, agp_i810_attach }, 146 { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82865_HB, 147 NULL, agp_i810_attach }, 148 { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82915G_HB, 149 NULL, agp_i810_attach }, 150 { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82915GM_HB, 151 NULL, agp_i810_attach }, 152 { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82945P_MCH, 153 NULL, agp_i810_attach }, 154 { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82945GM_HB, 155 NULL, agp_i810_attach }, 156 #endif 157 158 #if NAGP_INTEL > 0 159 { PCI_VENDOR_INTEL, -1, 160 NULL, agp_intel_attach }, 161 #endif 162 163 #if NAGP_SIS > 0 164 { PCI_VENDOR_SIS, -1, 165 NULL, agp_sis_attach }, 166 #endif 167 168 #if NAGP_VIA > 0 169 { PCI_VENDOR_VIATECH, -1, 170 NULL, agp_via_attach }, 171 #endif 172 173 { 0, 0, 174 NULL, NULL }, 175 }; 176 177 static const struct agp_product * 178 agp_lookup(const struct pci_attach_args *pa) 179 { 180 const struct agp_product *ap; 181 182 /* First find the vendor. */ 183 for (ap = agp_products; ap->ap_attach != NULL; ap++) { 184 if (PCI_VENDOR(pa->pa_id) == ap->ap_vendor) 185 break; 186 } 187 188 if (ap->ap_attach == NULL) 189 return (NULL); 190 191 /* Now find the product within the vendor's domain. */ 192 for (; ap->ap_attach != NULL; ap++) { 193 if (PCI_VENDOR(pa->pa_id) != ap->ap_vendor) { 194 /* Ran out of this vendor's section of the table. */ 195 return (NULL); 196 } 197 if (ap->ap_product == PCI_PRODUCT(pa->pa_id)) { 198 /* Exact match. */ 199 break; 200 } 201 if (ap->ap_product == (uint32_t) -1) { 202 /* Wildcard match. */ 203 break; 204 } 205 } 206 207 if (ap->ap_attach == NULL) 208 return (NULL); 209 210 /* Now let the product-specific driver filter the match. */ 211 if (ap->ap_match != NULL && (*ap->ap_match)(pa) == 0) 212 return (NULL); 213 214 return (ap); 215 } 216 217 static int 218 agpmatch(struct device *parent, struct cfdata *match, 219 void *aux) 220 { 221 struct agpbus_attach_args *apa = aux; 222 struct pci_attach_args *pa = &apa->apa_pci_args; 223 224 if (agp_lookup(pa) == NULL) 225 return (0); 226 227 return (1); 228 } 229 230 static const int agp_max[][2] = { 231 {0, 0}, 232 {32, 4}, 233 {64, 28}, 234 {128, 96}, 235 {256, 204}, 236 {512, 440}, 237 {1024, 942}, 238 {2048, 1920}, 239 {4096, 3932} 240 }; 241 #define agp_max_size (sizeof(agp_max) / sizeof(agp_max[0])) 242 243 static void 244 agpattach(struct device *parent, struct device *self, void *aux) 245 { 246 struct agpbus_attach_args *apa = aux; 247 struct pci_attach_args *pa = &apa->apa_pci_args; 248 struct agp_softc *sc = (void *)self; 249 const struct agp_product *ap; 250 int memsize, i, ret; 251 252 ap = agp_lookup(pa); 253 if (ap == NULL) { 254 printf("\n"); 255 panic("agpattach: impossible"); 256 } 257 258 aprint_naive(": AGP controller\n"); 259 260 sc->as_dmat = pa->pa_dmat; 261 sc->as_pc = pa->pa_pc; 262 sc->as_tag = pa->pa_tag; 263 sc->as_id = pa->pa_id; 264 265 /* 266 * Work out an upper bound for agp memory allocation. This 267 * uses a heurisitc table from the Linux driver. 268 */ 269 memsize = ptoa(physmem) >> 20; 270 for (i = 0; i < agp_max_size; i++) { 271 if (memsize <= agp_max[i][0]) 272 break; 273 } 274 if (i == agp_max_size) 275 i = agp_max_size - 1; 276 sc->as_maxmem = agp_max[i][1] << 20U; 277 278 /* 279 * The lock is used to prevent re-entry to 280 * agp_generic_bind_memory() since that function can sleep. 281 */ 282 lockinit(&sc->as_lock, PZERO|PCATCH, "agplk", 0, 0); 283 284 TAILQ_INIT(&sc->as_memory); 285 286 ret = (*ap->ap_attach)(parent, self, pa); 287 if (ret == 0) 288 aprint_normal(": aperture at 0x%lx, size 0x%lx\n", 289 (unsigned long)sc->as_apaddr, 290 (unsigned long)AGP_GET_APERTURE(sc)); 291 else 292 sc->as_chipc = NULL; 293 } 294 295 CFATTACH_DECL(agp, sizeof(struct agp_softc), 296 agpmatch, agpattach, NULL, NULL); 297 298 int 299 agp_map_aperture(struct pci_attach_args *pa, struct agp_softc *sc, int reg) 300 { 301 /* 302 * Find the aperture. Don't map it (yet), this would 303 * eat KVA. 304 */ 305 if (pci_mapreg_info(pa->pa_pc, pa->pa_tag, reg, 306 PCI_MAPREG_TYPE_MEM, &sc->as_apaddr, &sc->as_apsize, 307 &sc->as_apflags) != 0) 308 return ENXIO; 309 310 sc->as_apt = pa->pa_memt; 311 312 return 0; 313 } 314 315 struct agp_gatt * 316 agp_alloc_gatt(struct agp_softc *sc) 317 { 318 u_int32_t apsize = AGP_GET_APERTURE(sc); 319 u_int32_t entries = apsize >> AGP_PAGE_SHIFT; 320 struct agp_gatt *gatt; 321 void *virtual; 322 int dummyseg; 323 324 gatt = malloc(sizeof(struct agp_gatt), M_AGP, M_NOWAIT); 325 if (!gatt) 326 return NULL; 327 gatt->ag_entries = entries; 328 329 if (agp_alloc_dmamem(sc->as_dmat, entries * sizeof(u_int32_t), 330 0, &gatt->ag_dmamap, &virtual, &gatt->ag_physical, 331 &gatt->ag_dmaseg, 1, &dummyseg) != 0) 332 return NULL; 333 gatt->ag_virtual = (uint32_t *)virtual; 334 335 gatt->ag_size = entries * sizeof(u_int32_t); 336 memset(gatt->ag_virtual, 0, gatt->ag_size); 337 agp_flush_cache(); 338 339 return gatt; 340 } 341 342 void 343 agp_free_gatt(struct agp_softc *sc, struct agp_gatt *gatt) 344 { 345 agp_free_dmamem(sc->as_dmat, gatt->ag_size, gatt->ag_dmamap, 346 (void *)gatt->ag_virtual, &gatt->ag_dmaseg, 1); 347 free(gatt, M_AGP); 348 } 349 350 351 int 352 agp_generic_detach(struct agp_softc *sc) 353 { 354 lockmgr(&sc->as_lock, LK_DRAIN, 0); 355 agp_flush_cache(); 356 return 0; 357 } 358 359 static int 360 agpdev_match(struct pci_attach_args *pa) 361 { 362 if (PCI_CLASS(pa->pa_class) == PCI_CLASS_DISPLAY && 363 PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_DISPLAY_VGA) 364 if (pci_get_capability(pa->pa_pc, pa->pa_tag, PCI_CAP_AGP, 365 NULL, NULL)) 366 return 1; 367 368 return 0; 369 } 370 371 int 372 agp_generic_enable(struct agp_softc *sc, u_int32_t mode) 373 { 374 struct pci_attach_args pa; 375 pcireg_t tstatus, mstatus; 376 pcireg_t command; 377 int rq, sba, fw, rate, capoff; 378 379 if (pci_find_device(&pa, agpdev_match) == 0 || 380 pci_get_capability(pa.pa_pc, pa.pa_tag, PCI_CAP_AGP, 381 &capoff, NULL) == 0) { 382 printf("%s: can't find display\n", sc->as_dev.dv_xname); 383 return ENXIO; 384 } 385 386 tstatus = pci_conf_read(sc->as_pc, sc->as_tag, 387 sc->as_capoff + AGP_STATUS); 388 mstatus = pci_conf_read(pa.pa_pc, pa.pa_tag, 389 capoff + AGP_STATUS); 390 391 /* Set RQ to the min of mode, tstatus and mstatus */ 392 rq = AGP_MODE_GET_RQ(mode); 393 if (AGP_MODE_GET_RQ(tstatus) < rq) 394 rq = AGP_MODE_GET_RQ(tstatus); 395 if (AGP_MODE_GET_RQ(mstatus) < rq) 396 rq = AGP_MODE_GET_RQ(mstatus); 397 398 /* Set SBA if all three can deal with SBA */ 399 sba = (AGP_MODE_GET_SBA(tstatus) 400 & AGP_MODE_GET_SBA(mstatus) 401 & AGP_MODE_GET_SBA(mode)); 402 403 /* Similar for FW */ 404 fw = (AGP_MODE_GET_FW(tstatus) 405 & AGP_MODE_GET_FW(mstatus) 406 & AGP_MODE_GET_FW(mode)); 407 408 /* Figure out the max rate */ 409 rate = (AGP_MODE_GET_RATE(tstatus) 410 & AGP_MODE_GET_RATE(mstatus) 411 & AGP_MODE_GET_RATE(mode)); 412 if (rate & AGP_MODE_RATE_4x) 413 rate = AGP_MODE_RATE_4x; 414 else if (rate & AGP_MODE_RATE_2x) 415 rate = AGP_MODE_RATE_2x; 416 else 417 rate = AGP_MODE_RATE_1x; 418 419 /* Construct the new mode word and tell the hardware */ 420 command = AGP_MODE_SET_RQ(0, rq); 421 command = AGP_MODE_SET_SBA(command, sba); 422 command = AGP_MODE_SET_FW(command, fw); 423 command = AGP_MODE_SET_RATE(command, rate); 424 command = AGP_MODE_SET_AGP(command, 1); 425 pci_conf_write(sc->as_pc, sc->as_tag, 426 sc->as_capoff + AGP_COMMAND, command); 427 pci_conf_write(pa.pa_pc, pa.pa_tag, capoff + AGP_COMMAND, command); 428 429 return 0; 430 } 431 432 struct agp_memory * 433 agp_generic_alloc_memory(struct agp_softc *sc, int type, vsize_t size) 434 { 435 struct agp_memory *mem; 436 437 if ((size & (AGP_PAGE_SIZE - 1)) != 0) 438 return 0; 439 440 if (sc->as_allocated + size > sc->as_maxmem) 441 return 0; 442 443 if (type != 0) { 444 printf("agp_generic_alloc_memory: unsupported type %d\n", 445 type); 446 return 0; 447 } 448 449 mem = malloc(sizeof *mem, M_AGP, M_WAITOK); 450 if (mem == NULL) 451 return NULL; 452 453 if (bus_dmamap_create(sc->as_dmat, size, size / PAGE_SIZE + 1, 454 size, 0, BUS_DMA_NOWAIT, &mem->am_dmamap) != 0) { 455 free(mem, M_AGP); 456 return NULL; 457 } 458 459 mem->am_id = sc->as_nextid++; 460 mem->am_size = size; 461 mem->am_type = 0; 462 mem->am_physical = 0; 463 mem->am_offset = 0; 464 mem->am_is_bound = 0; 465 TAILQ_INSERT_TAIL(&sc->as_memory, mem, am_link); 466 sc->as_allocated += size; 467 468 return mem; 469 } 470 471 int 472 agp_generic_free_memory(struct agp_softc *sc, struct agp_memory *mem) 473 { 474 if (mem->am_is_bound) 475 return EBUSY; 476 477 sc->as_allocated -= mem->am_size; 478 TAILQ_REMOVE(&sc->as_memory, mem, am_link); 479 bus_dmamap_destroy(sc->as_dmat, mem->am_dmamap); 480 free(mem, M_AGP); 481 return 0; 482 } 483 484 int 485 agp_generic_bind_memory(struct agp_softc *sc, struct agp_memory *mem, 486 off_t offset) 487 { 488 off_t i, k; 489 bus_size_t done, j; 490 int error; 491 bus_dma_segment_t *segs, *seg; 492 bus_addr_t pa; 493 int contigpages, nseg; 494 495 lockmgr(&sc->as_lock, LK_EXCLUSIVE, 0); 496 497 if (mem->am_is_bound) { 498 printf("%s: memory already bound\n", sc->as_dev.dv_xname); 499 lockmgr(&sc->as_lock, LK_RELEASE, 0); 500 return EINVAL; 501 } 502 503 if (offset < 0 504 || (offset & (AGP_PAGE_SIZE - 1)) != 0 505 || offset + mem->am_size > AGP_GET_APERTURE(sc)) { 506 printf("%s: binding memory at bad offset %#lx\n", 507 sc->as_dev.dv_xname, (unsigned long) offset); 508 lockmgr(&sc->as_lock, LK_RELEASE, 0); 509 return EINVAL; 510 } 511 512 /* 513 * XXXfvdl 514 * The memory here needs to be directly accessable from the 515 * AGP video card, so it should be allocated using bus_dma. 516 * However, it need not be contiguous, since individual pages 517 * are translated using the GATT. 518 * 519 * Using a large chunk of contiguous memory may get in the way 520 * of other subsystems that may need one, so we try to be friendly 521 * and ask for allocation in chunks of a minimum of 8 pages 522 * of contiguous memory on average, falling back to 4, 2 and 1 523 * if really needed. Larger chunks are preferred, since allocating 524 * a bus_dma_segment per page would be overkill. 525 */ 526 527 for (contigpages = 8; contigpages > 0; contigpages >>= 1) { 528 nseg = (mem->am_size / (contigpages * PAGE_SIZE)) + 1; 529 segs = malloc(nseg * sizeof *segs, M_AGP, M_WAITOK); 530 if (segs == NULL) { 531 lockmgr(&sc->as_lock, LK_RELEASE, 0); 532 return ENOMEM; 533 } 534 if (bus_dmamem_alloc(sc->as_dmat, mem->am_size, PAGE_SIZE, 0, 535 segs, nseg, &mem->am_nseg, 536 contigpages > 1 ? 537 BUS_DMA_NOWAIT : BUS_DMA_WAITOK) != 0) { 538 free(segs, M_AGP); 539 continue; 540 } 541 if (bus_dmamem_map(sc->as_dmat, segs, mem->am_nseg, 542 mem->am_size, &mem->am_virtual, BUS_DMA_WAITOK) != 0) { 543 bus_dmamem_free(sc->as_dmat, segs, mem->am_nseg); 544 free(segs, M_AGP); 545 continue; 546 } 547 if (bus_dmamap_load(sc->as_dmat, mem->am_dmamap, 548 mem->am_virtual, mem->am_size, NULL, BUS_DMA_WAITOK) != 0) { 549 bus_dmamem_unmap(sc->as_dmat, mem->am_virtual, 550 mem->am_size); 551 bus_dmamem_free(sc->as_dmat, segs, mem->am_nseg); 552 free(segs, M_AGP); 553 continue; 554 } 555 mem->am_dmaseg = segs; 556 break; 557 } 558 559 if (contigpages == 0) { 560 lockmgr(&sc->as_lock, LK_RELEASE, 0); 561 return ENOMEM; 562 } 563 564 565 /* 566 * Bind the individual pages and flush the chipset's 567 * TLB. 568 */ 569 done = 0; 570 for (i = 0; i < mem->am_dmamap->dm_nsegs; i++) { 571 seg = &mem->am_dmamap->dm_segs[i]; 572 /* 573 * Install entries in the GATT, making sure that if 574 * AGP_PAGE_SIZE < PAGE_SIZE and mem->am_size is not 575 * aligned to PAGE_SIZE, we don't modify too many GATT 576 * entries. 577 */ 578 for (j = 0; j < seg->ds_len && (done + j) < mem->am_size; 579 j += AGP_PAGE_SIZE) { 580 pa = seg->ds_addr + j; 581 AGP_DPF(("binding offset %#lx to pa %#lx\n", 582 (unsigned long)(offset + done + j), 583 (unsigned long)pa)); 584 error = AGP_BIND_PAGE(sc, offset + done + j, pa); 585 if (error) { 586 /* 587 * Bail out. Reverse all the mappings 588 * and unwire the pages. 589 */ 590 for (k = 0; k < done + j; k += AGP_PAGE_SIZE) 591 AGP_UNBIND_PAGE(sc, offset + k); 592 593 bus_dmamap_unload(sc->as_dmat, mem->am_dmamap); 594 bus_dmamem_unmap(sc->as_dmat, mem->am_virtual, 595 mem->am_size); 596 bus_dmamem_free(sc->as_dmat, mem->am_dmaseg, 597 mem->am_nseg); 598 free(mem->am_dmaseg, M_AGP); 599 lockmgr(&sc->as_lock, LK_RELEASE, 0); 600 return error; 601 } 602 } 603 done += seg->ds_len; 604 } 605 606 /* 607 * Flush the CPU cache since we are providing a new mapping 608 * for these pages. 609 */ 610 agp_flush_cache(); 611 612 /* 613 * Make sure the chipset gets the new mappings. 614 */ 615 AGP_FLUSH_TLB(sc); 616 617 mem->am_offset = offset; 618 mem->am_is_bound = 1; 619 620 lockmgr(&sc->as_lock, LK_RELEASE, 0); 621 622 return 0; 623 } 624 625 int 626 agp_generic_unbind_memory(struct agp_softc *sc, struct agp_memory *mem) 627 { 628 int i; 629 630 lockmgr(&sc->as_lock, LK_EXCLUSIVE, 0); 631 632 if (!mem->am_is_bound) { 633 printf("%s: memory is not bound\n", sc->as_dev.dv_xname); 634 lockmgr(&sc->as_lock, LK_RELEASE, 0); 635 return EINVAL; 636 } 637 638 639 /* 640 * Unbind the individual pages and flush the chipset's 641 * TLB. Unwire the pages so they can be swapped. 642 */ 643 for (i = 0; i < mem->am_size; i += AGP_PAGE_SIZE) 644 AGP_UNBIND_PAGE(sc, mem->am_offset + i); 645 646 agp_flush_cache(); 647 AGP_FLUSH_TLB(sc); 648 649 bus_dmamap_unload(sc->as_dmat, mem->am_dmamap); 650 bus_dmamem_unmap(sc->as_dmat, mem->am_virtual, mem->am_size); 651 bus_dmamem_free(sc->as_dmat, mem->am_dmaseg, mem->am_nseg); 652 653 free(mem->am_dmaseg, M_AGP); 654 655 mem->am_offset = 0; 656 mem->am_is_bound = 0; 657 658 lockmgr(&sc->as_lock, LK_RELEASE, 0); 659 660 return 0; 661 } 662 663 /* Helper functions for implementing user/kernel api */ 664 665 static int 666 agp_acquire_helper(struct agp_softc *sc, enum agp_acquire_state state) 667 { 668 if (sc->as_state != AGP_ACQUIRE_FREE) 669 return EBUSY; 670 sc->as_state = state; 671 672 return 0; 673 } 674 675 static int 676 agp_release_helper(struct agp_softc *sc, enum agp_acquire_state state) 677 { 678 679 if (sc->as_state == AGP_ACQUIRE_FREE) 680 return 0; 681 682 if (sc->as_state != state) 683 return EBUSY; 684 685 sc->as_state = AGP_ACQUIRE_FREE; 686 return 0; 687 } 688 689 static struct agp_memory * 690 agp_find_memory(struct agp_softc *sc, int id) 691 { 692 struct agp_memory *mem; 693 694 AGP_DPF(("searching for memory block %d\n", id)); 695 TAILQ_FOREACH(mem, &sc->as_memory, am_link) { 696 AGP_DPF(("considering memory block %d\n", mem->am_id)); 697 if (mem->am_id == id) 698 return mem; 699 } 700 return 0; 701 } 702 703 /* Implementation of the userland ioctl api */ 704 705 static int 706 agp_info_user(struct agp_softc *sc, agp_info *info) 707 { 708 memset(info, 0, sizeof *info); 709 info->bridge_id = sc->as_id; 710 if (sc->as_capoff != 0) 711 info->agp_mode = pci_conf_read(sc->as_pc, sc->as_tag, 712 sc->as_capoff + AGP_STATUS); 713 else 714 info->agp_mode = 0; /* i810 doesn't have real AGP */ 715 info->aper_base = sc->as_apaddr; 716 info->aper_size = AGP_GET_APERTURE(sc) >> 20; 717 info->pg_total = info->pg_system = sc->as_maxmem >> AGP_PAGE_SHIFT; 718 info->pg_used = sc->as_allocated >> AGP_PAGE_SHIFT; 719 720 return 0; 721 } 722 723 static int 724 agp_setup_user(struct agp_softc *sc, agp_setup *setup) 725 { 726 return AGP_ENABLE(sc, setup->agp_mode); 727 } 728 729 static int 730 agp_allocate_user(struct agp_softc *sc, agp_allocate *alloc) 731 { 732 struct agp_memory *mem; 733 734 mem = AGP_ALLOC_MEMORY(sc, 735 alloc->type, 736 alloc->pg_count << AGP_PAGE_SHIFT); 737 if (mem) { 738 alloc->key = mem->am_id; 739 alloc->physical = mem->am_physical; 740 return 0; 741 } else { 742 return ENOMEM; 743 } 744 } 745 746 static int 747 agp_deallocate_user(struct agp_softc *sc, int id) 748 { 749 struct agp_memory *mem = agp_find_memory(sc, id); 750 751 if (mem) { 752 AGP_FREE_MEMORY(sc, mem); 753 return 0; 754 } else { 755 return ENOENT; 756 } 757 } 758 759 static int 760 agp_bind_user(struct agp_softc *sc, agp_bind *bind) 761 { 762 struct agp_memory *mem = agp_find_memory(sc, bind->key); 763 764 if (!mem) 765 return ENOENT; 766 767 return AGP_BIND_MEMORY(sc, mem, bind->pg_start << AGP_PAGE_SHIFT); 768 } 769 770 static int 771 agp_unbind_user(struct agp_softc *sc, agp_unbind *unbind) 772 { 773 struct agp_memory *mem = agp_find_memory(sc, unbind->key); 774 775 if (!mem) 776 return ENOENT; 777 778 return AGP_UNBIND_MEMORY(sc, mem); 779 } 780 781 static int 782 agpopen(dev_t dev, int oflags, int devtype, 783 struct lwp *l) 784 { 785 struct agp_softc *sc = device_lookup(&agp_cd, AGPUNIT(dev)); 786 787 if (sc == NULL) 788 return ENXIO; 789 790 if (sc->as_chipc == NULL) 791 return ENXIO; 792 793 if (!sc->as_isopen) 794 sc->as_isopen = 1; 795 else 796 return EBUSY; 797 798 return 0; 799 } 800 801 static int 802 agpclose(dev_t dev, int fflag, int devtype, 803 struct lwp *l) 804 { 805 struct agp_softc *sc = device_lookup(&agp_cd, AGPUNIT(dev)); 806 struct agp_memory *mem; 807 808 /* 809 * Clear the GATT and force release on last close 810 */ 811 if (sc->as_state == AGP_ACQUIRE_USER) { 812 while ((mem = TAILQ_FIRST(&sc->as_memory))) { 813 if (mem->am_is_bound) { 814 printf("agpclose: mem %d is bound\n", 815 mem->am_id); 816 AGP_UNBIND_MEMORY(sc, mem); 817 } 818 /* 819 * XXX it is not documented, but if the protocol allows 820 * allocate->acquire->bind, it would be possible that 821 * memory ranges are allocated by the kernel here, 822 * which we shouldn't free. We'd have to keep track of 823 * the memory range's owner. 824 * The kernel API is unsed yet, so we get away with 825 * freeing all. 826 */ 827 AGP_FREE_MEMORY(sc, mem); 828 } 829 agp_release_helper(sc, AGP_ACQUIRE_USER); 830 } 831 sc->as_isopen = 0; 832 833 return 0; 834 } 835 836 static int 837 agpioctl(dev_t dev, u_long cmd, void *data, int fflag, struct lwp *l) 838 { 839 struct agp_softc *sc = device_lookup(&agp_cd, AGPUNIT(dev)); 840 841 if (sc == NULL) 842 return ENODEV; 843 844 if ((fflag & FWRITE) == 0 && cmd != AGPIOC_INFO) 845 return EPERM; 846 847 switch (cmd) { 848 case AGPIOC_INFO: 849 return agp_info_user(sc, (agp_info *) data); 850 851 case AGPIOC_ACQUIRE: 852 return agp_acquire_helper(sc, AGP_ACQUIRE_USER); 853 854 case AGPIOC_RELEASE: 855 return agp_release_helper(sc, AGP_ACQUIRE_USER); 856 857 case AGPIOC_SETUP: 858 return agp_setup_user(sc, (agp_setup *)data); 859 860 case AGPIOC_ALLOCATE: 861 return agp_allocate_user(sc, (agp_allocate *)data); 862 863 case AGPIOC_DEALLOCATE: 864 return agp_deallocate_user(sc, *(int *) data); 865 866 case AGPIOC_BIND: 867 return agp_bind_user(sc, (agp_bind *)data); 868 869 case AGPIOC_UNBIND: 870 return agp_unbind_user(sc, (agp_unbind *)data); 871 872 } 873 874 return EINVAL; 875 } 876 877 static paddr_t 878 agpmmap(dev_t dev, off_t offset, int prot) 879 { 880 struct agp_softc *sc = device_lookup(&agp_cd, AGPUNIT(dev)); 881 882 if (offset > AGP_GET_APERTURE(sc)) 883 return -1; 884 885 return (bus_space_mmap(sc->as_apt, sc->as_apaddr, offset, prot, 886 BUS_SPACE_MAP_LINEAR)); 887 } 888 889 const struct cdevsw agp_cdevsw = { 890 agpopen, agpclose, noread, nowrite, agpioctl, 891 nostop, notty, nopoll, agpmmap, nokqfilter, D_OTHER 892 }; 893 894 /* Implementation of the kernel api */ 895 896 void * 897 agp_find_device(int unit) 898 { 899 return device_lookup(&agp_cd, unit); 900 } 901 902 enum agp_acquire_state 903 agp_state(void *devcookie) 904 { 905 struct agp_softc *sc = devcookie; 906 return sc->as_state; 907 } 908 909 void 910 agp_get_info(void *devcookie, struct agp_info *info) 911 { 912 struct agp_softc *sc = devcookie; 913 914 info->ai_mode = pci_conf_read(sc->as_pc, sc->as_tag, 915 sc->as_capoff + AGP_STATUS); 916 info->ai_aperture_base = sc->as_apaddr; 917 info->ai_aperture_size = sc->as_apsize; /* XXXfvdl inconsistent */ 918 info->ai_memory_allowed = sc->as_maxmem; 919 info->ai_memory_used = sc->as_allocated; 920 } 921 922 int 923 agp_acquire(void *dev) 924 { 925 return agp_acquire_helper(dev, AGP_ACQUIRE_KERNEL); 926 } 927 928 int 929 agp_release(void *dev) 930 { 931 return agp_release_helper(dev, AGP_ACQUIRE_KERNEL); 932 } 933 934 int 935 agp_enable(void *dev, u_int32_t mode) 936 { 937 struct agp_softc *sc = dev; 938 939 return AGP_ENABLE(sc, mode); 940 } 941 942 void *agp_alloc_memory(void *dev, int type, vsize_t bytes) 943 { 944 struct agp_softc *sc = dev; 945 946 return (void *)AGP_ALLOC_MEMORY(sc, type, bytes); 947 } 948 949 void agp_free_memory(void *dev, void *handle) 950 { 951 struct agp_softc *sc = dev; 952 struct agp_memory *mem = (struct agp_memory *) handle; 953 AGP_FREE_MEMORY(sc, mem); 954 } 955 956 int agp_bind_memory(void *dev, void *handle, off_t offset) 957 { 958 struct agp_softc *sc = dev; 959 struct agp_memory *mem = (struct agp_memory *) handle; 960 961 return AGP_BIND_MEMORY(sc, mem, offset); 962 } 963 964 int agp_unbind_memory(void *dev, void *handle) 965 { 966 struct agp_softc *sc = dev; 967 struct agp_memory *mem = (struct agp_memory *) handle; 968 969 return AGP_UNBIND_MEMORY(sc, mem); 970 } 971 972 void agp_memory_info(void *dev, void *handle, 973 struct agp_memory_info *mi) 974 { 975 struct agp_memory *mem = (struct agp_memory *) handle; 976 977 mi->ami_size = mem->am_size; 978 mi->ami_physical = mem->am_physical; 979 mi->ami_offset = mem->am_offset; 980 mi->ami_is_bound = mem->am_is_bound; 981 } 982 983 int 984 agp_alloc_dmamem(bus_dma_tag_t tag, size_t size, int flags, 985 bus_dmamap_t *mapp, void **vaddr, bus_addr_t *baddr, 986 bus_dma_segment_t *seg, int nseg, int *rseg) 987 988 { 989 int error, level = 0; 990 991 if ((error = bus_dmamem_alloc(tag, size, PAGE_SIZE, 0, 992 seg, nseg, rseg, BUS_DMA_NOWAIT)) != 0) 993 goto out; 994 level++; 995 996 if ((error = bus_dmamem_map(tag, seg, *rseg, size, vaddr, 997 BUS_DMA_NOWAIT | flags)) != 0) 998 goto out; 999 level++; 1000 1001 if ((error = bus_dmamap_create(tag, size, *rseg, size, 0, 1002 BUS_DMA_NOWAIT, mapp)) != 0) 1003 goto out; 1004 level++; 1005 1006 if ((error = bus_dmamap_load(tag, *mapp, *vaddr, size, NULL, 1007 BUS_DMA_NOWAIT)) != 0) 1008 goto out; 1009 1010 *baddr = (*mapp)->dm_segs[0].ds_addr; 1011 1012 return 0; 1013 out: 1014 switch (level) { 1015 case 3: 1016 bus_dmamap_destroy(tag, *mapp); 1017 /* FALLTHROUGH */ 1018 case 2: 1019 bus_dmamem_unmap(tag, *vaddr, size); 1020 /* FALLTHROUGH */ 1021 case 1: 1022 bus_dmamem_free(tag, seg, *rseg); 1023 break; 1024 default: 1025 break; 1026 } 1027 1028 return error; 1029 } 1030 1031 void 1032 agp_free_dmamem(bus_dma_tag_t tag, size_t size, bus_dmamap_t map, 1033 void *vaddr, bus_dma_segment_t *seg, int nseg) 1034 { 1035 1036 bus_dmamap_unload(tag, map); 1037 bus_dmamap_destroy(tag, map); 1038 bus_dmamem_unmap(tag, vaddr, size); 1039 bus_dmamem_free(tag, seg, nseg); 1040 } 1041
Indexes created Mon Sep 22 05:09:51 GMT 2025