vga_pci.c revision 331111
1/*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2005 John Baldwin <jhb@FreeBSD.org> 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 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: stable/11/sys/dev/pci/vga_pci.c 331111 2018-03-17 20:20:29Z bryanv $"); 31 32/* 33 * Simple driver for PCI VGA display devices. Drivers such as agp(4) and 34 * drm(4) should attach as children of this device. 35 * 36 * XXX: The vgapci name is a hack until we somehow merge the isa vga driver 37 * in or rename it. 38 */ 39 40#include <sys/param.h> 41#include <sys/bus.h> 42#include <sys/kernel.h> 43#include <sys/module.h> 44#include <sys/rman.h> 45#include <sys/sysctl.h> 46#include <sys/systm.h> 47 48#if defined(__amd64__) || defined(__i386__) 49#include <vm/vm.h> 50#include <vm/pmap.h> 51#endif 52 53#include <dev/pci/pcireg.h> 54#include <dev/pci/pcivar.h> 55 56#include <compat/x86bios/x86bios.h> /* To re-POST the card. */ 57 58struct vga_resource { 59 struct resource *vr_res; 60 int vr_refs; 61}; 62 63struct vga_pci_softc { 64 device_t vga_msi_child; /* Child driver using MSI. */ 65 struct vga_resource vga_bars[PCIR_MAX_BAR_0 + 1]; 66 struct vga_resource vga_bios; 67}; 68 69SYSCTL_DECL(_hw_pci); 70 71static struct vga_resource *lookup_res(struct vga_pci_softc *sc, int rid); 72static struct resource *vga_pci_alloc_resource(device_t dev, device_t child, 73 int type, int *rid, rman_res_t start, rman_res_t end, rman_res_t count, 74 u_int flags); 75static int vga_pci_release_resource(device_t dev, device_t child, int type, 76 int rid, struct resource *r); 77 78int vga_pci_default_unit = -1; 79SYSCTL_INT(_hw_pci, OID_AUTO, default_vgapci_unit, CTLFLAG_RDTUN, 80 &vga_pci_default_unit, -1, "Default VGA-compatible display"); 81 82int 83vga_pci_is_boot_display(device_t dev) 84{ 85 int unit; 86 device_t pcib; 87 uint16_t config; 88 89 /* Check that the given device is a video card */ 90 if ((pci_get_class(dev) != PCIC_DISPLAY && 91 (pci_get_class(dev) != PCIC_OLD || 92 pci_get_subclass(dev) != PCIS_OLD_VGA))) 93 return (0); 94 95 unit = device_get_unit(dev); 96 97 if (vga_pci_default_unit >= 0) { 98 /* 99 * The boot display device was determined by a previous 100 * call to this function, or the user forced it using 101 * the hw.pci.default_vgapci_unit tunable. 102 */ 103 return (vga_pci_default_unit == unit); 104 } 105 106 /* 107 * The primary video card used as a boot display must have the 108 * "I/O" and "Memory Address Space Decoding" bits set in its 109 * Command register. 110 * 111 * Furthermore, if the card is attached to a bridge, instead of 112 * the root PCI bus, the bridge must have the "VGA Enable" bit 113 * set in its Control register. 114 */ 115 116 pcib = device_get_parent(device_get_parent(dev)); 117 if (device_get_devclass(device_get_parent(pcib)) == 118 devclass_find("pci")) { 119 /* 120 * The parent bridge is a PCI-to-PCI bridge: check the 121 * value of the "VGA Enable" bit. 122 */ 123 config = pci_read_config(pcib, PCIR_BRIDGECTL_1, 2); 124 if ((config & PCIB_BCR_VGA_ENABLE) == 0) 125 return (0); 126 } 127 128 config = pci_read_config(dev, PCIR_COMMAND, 2); 129 if ((config & (PCIM_CMD_PORTEN | PCIM_CMD_MEMEN)) == 0) 130 return (0); 131 132 /* 133 * Disable interrupts until a chipset driver is loaded for 134 * this PCI device. Else unhandled display adapter interrupts 135 * might freeze the CPU. 136 */ 137 pci_write_config(dev, PCIR_COMMAND, config | PCIM_CMD_INTxDIS, 2); 138 139 /* This video card is the boot display: record its unit number. */ 140 vga_pci_default_unit = unit; 141 device_set_flags(dev, 1); 142 143 return (1); 144} 145 146void * 147vga_pci_map_bios(device_t dev, size_t *size) 148{ 149 int rid; 150 struct resource *res; 151 152#if defined(__amd64__) || defined(__i386__) 153 if (vga_pci_is_boot_display(dev)) { 154 /* 155 * On x86, the System BIOS copy the default display 156 * device's Video BIOS at a fixed location in system 157 * memory (0xC0000, 128 kBytes long) at boot time. 158 * 159 * We use this copy for the default boot device, because 160 * the original ROM may not be valid after boot. 161 */ 162 163 *size = VGA_PCI_BIOS_SHADOW_SIZE; 164 return (pmap_mapbios(VGA_PCI_BIOS_SHADOW_ADDR, *size)); 165 } 166#endif 167 168 rid = PCIR_BIOS; 169 res = vga_pci_alloc_resource(dev, NULL, SYS_RES_MEMORY, &rid, 0, 170 ~0, 1, RF_ACTIVE); 171 if (res == NULL) { 172 return (NULL); 173 } 174 175 *size = rman_get_size(res); 176 return (rman_get_virtual(res)); 177} 178 179void 180vga_pci_unmap_bios(device_t dev, void *bios) 181{ 182 struct vga_resource *vr; 183 184 if (bios == NULL) { 185 return; 186 } 187 188#if defined(__amd64__) || defined(__i386__) 189 if (vga_pci_is_boot_display(dev)) { 190 /* We mapped the BIOS shadow copy located at 0xC0000. */ 191 pmap_unmapdev((vm_offset_t)bios, VGA_PCI_BIOS_SHADOW_SIZE); 192 193 return; 194 } 195#endif 196 197 /* 198 * Look up the PCIR_BIOS resource in our softc. It should match 199 * the address we returned previously. 200 */ 201 vr = lookup_res(device_get_softc(dev), PCIR_BIOS); 202 KASSERT(vr->vr_res != NULL, ("vga_pci_unmap_bios: bios not mapped")); 203 KASSERT(rman_get_virtual(vr->vr_res) == bios, 204 ("vga_pci_unmap_bios: mismatch")); 205 vga_pci_release_resource(dev, NULL, SYS_RES_MEMORY, PCIR_BIOS, 206 vr->vr_res); 207} 208 209int 210vga_pci_repost(device_t dev) 211{ 212#if defined(__amd64__) || (defined(__i386__) && !defined(PC98)) 213 x86regs_t regs; 214 215 if (!vga_pci_is_boot_display(dev)) 216 return (EINVAL); 217 218 if (x86bios_get_orm(VGA_PCI_BIOS_SHADOW_ADDR) == NULL) 219 return (ENOTSUP); 220 221 x86bios_init_regs(®s); 222 223 regs.R_AH = pci_get_bus(dev); 224 regs.R_AL = (pci_get_slot(dev) << 3) | (pci_get_function(dev) & 0x07); 225 regs.R_DL = 0x80; 226 227 device_printf(dev, "REPOSTing\n"); 228 x86bios_call(®s, X86BIOS_PHYSTOSEG(VGA_PCI_BIOS_SHADOW_ADDR + 3), 229 X86BIOS_PHYSTOOFF(VGA_PCI_BIOS_SHADOW_ADDR + 3)); 230 231 x86bios_get_intr(0x10); 232 233 return (0); 234#else 235 return (ENOTSUP); 236#endif 237} 238 239static int 240vga_pci_probe(device_t dev) 241{ 242 243 switch (pci_get_class(dev)) { 244 case PCIC_DISPLAY: 245 break; 246 case PCIC_OLD: 247 if (pci_get_subclass(dev) != PCIS_OLD_VGA) 248 return (ENXIO); 249 break; 250 default: 251 return (ENXIO); 252 } 253 254 /* Probe default display. */ 255 vga_pci_is_boot_display(dev); 256 257 device_set_desc(dev, "VGA-compatible display"); 258 return (BUS_PROBE_GENERIC); 259} 260 261static int 262vga_pci_attach(device_t dev) 263{ 264 265 bus_generic_probe(dev); 266 267 /* Always create a drm child for now to make it easier on drm. */ 268 device_add_child(dev, "drm", -1); 269 device_add_child(dev, "drmn", -1); 270 bus_generic_attach(dev); 271 272 if (vga_pci_is_boot_display(dev)) 273 device_printf(dev, "Boot video device\n"); 274 275 return (0); 276} 277 278static int 279vga_pci_suspend(device_t dev) 280{ 281 282 return (bus_generic_suspend(dev)); 283} 284 285static int 286vga_pci_resume(device_t dev) 287{ 288 289 return (bus_generic_resume(dev)); 290} 291 292/* Bus interface. */ 293 294static int 295vga_pci_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 296{ 297 298 return (BUS_READ_IVAR(device_get_parent(dev), dev, which, result)); 299} 300 301static int 302vga_pci_write_ivar(device_t dev, device_t child, int which, uintptr_t value) 303{ 304 305 return (EINVAL); 306} 307 308static int 309vga_pci_setup_intr(device_t dev, device_t child, struct resource *irq, 310 int flags, driver_filter_t *filter, driver_intr_t *intr, void *arg, 311 void **cookiep) 312{ 313 return (BUS_SETUP_INTR(device_get_parent(dev), dev, irq, flags, 314 filter, intr, arg, cookiep)); 315} 316 317static int 318vga_pci_teardown_intr(device_t dev, device_t child, struct resource *irq, 319 void *cookie) 320{ 321 return (BUS_TEARDOWN_INTR(device_get_parent(dev), dev, irq, cookie)); 322} 323 324static struct vga_resource * 325lookup_res(struct vga_pci_softc *sc, int rid) 326{ 327 int bar; 328 329 if (rid == PCIR_BIOS) 330 return (&sc->vga_bios); 331 bar = PCI_RID2BAR(rid); 332 if (bar >= 0 && bar <= PCIR_MAX_BAR_0) 333 return (&sc->vga_bars[bar]); 334 return (NULL); 335} 336 337static struct resource * 338vga_pci_alloc_resource(device_t dev, device_t child, int type, int *rid, 339 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags) 340{ 341 struct vga_resource *vr; 342 343 switch (type) { 344 case SYS_RES_MEMORY: 345 case SYS_RES_IOPORT: 346 /* 347 * For BARs, we cache the resource so that we only allocate it 348 * from the PCI bus once. 349 */ 350 vr = lookup_res(device_get_softc(dev), *rid); 351 if (vr == NULL) 352 return (NULL); 353 if (vr->vr_res == NULL) 354 vr->vr_res = bus_alloc_resource(dev, type, rid, start, 355 end, count, flags); 356 if (vr->vr_res != NULL) 357 vr->vr_refs++; 358 return (vr->vr_res); 359 } 360 return (bus_alloc_resource(dev, type, rid, start, end, count, flags)); 361} 362 363static int 364vga_pci_release_resource(device_t dev, device_t child, int type, int rid, 365 struct resource *r) 366{ 367 struct vga_resource *vr; 368 int error; 369 370 switch (type) { 371 case SYS_RES_MEMORY: 372 case SYS_RES_IOPORT: 373 /* 374 * For BARs, we release the resource from the PCI bus 375 * when the last child reference goes away. 376 */ 377 vr = lookup_res(device_get_softc(dev), rid); 378 if (vr == NULL) 379 return (EINVAL); 380 if (vr->vr_res == NULL) 381 return (EINVAL); 382 KASSERT(vr->vr_res == r, ("vga_pci resource mismatch")); 383 if (vr->vr_refs > 1) { 384 vr->vr_refs--; 385 return (0); 386 } 387 KASSERT(vr->vr_refs > 0, 388 ("vga_pci resource reference count underflow")); 389 error = bus_release_resource(dev, type, rid, r); 390 if (error == 0) { 391 vr->vr_res = NULL; 392 vr->vr_refs = 0; 393 } 394 return (error); 395 } 396 397 return (bus_release_resource(dev, type, rid, r)); 398} 399 400/* PCI interface. */ 401 402static uint32_t 403vga_pci_read_config(device_t dev, device_t child, int reg, int width) 404{ 405 406 return (pci_read_config(dev, reg, width)); 407} 408 409static void 410vga_pci_write_config(device_t dev, device_t child, int reg, 411 uint32_t val, int width) 412{ 413 414 pci_write_config(dev, reg, val, width); 415} 416 417static int 418vga_pci_enable_busmaster(device_t dev, device_t child) 419{ 420 421 return (pci_enable_busmaster(dev)); 422} 423 424static int 425vga_pci_disable_busmaster(device_t dev, device_t child) 426{ 427 428 return (pci_disable_busmaster(dev)); 429} 430 431static int 432vga_pci_enable_io(device_t dev, device_t child, int space) 433{ 434 435 device_printf(dev, "child %s requested pci_enable_io\n", 436 device_get_nameunit(child)); 437 return (pci_enable_io(dev, space)); 438} 439 440static int 441vga_pci_disable_io(device_t dev, device_t child, int space) 442{ 443 444 device_printf(dev, "child %s requested pci_disable_io\n", 445 device_get_nameunit(child)); 446 return (pci_disable_io(dev, space)); 447} 448 449static int 450vga_pci_get_vpd_ident(device_t dev, device_t child, const char **identptr) 451{ 452 453 return (pci_get_vpd_ident(dev, identptr)); 454} 455 456static int 457vga_pci_get_vpd_readonly(device_t dev, device_t child, const char *kw, 458 const char **vptr) 459{ 460 461 return (pci_get_vpd_readonly(dev, kw, vptr)); 462} 463 464static int 465vga_pci_set_powerstate(device_t dev, device_t child, int state) 466{ 467 468 device_printf(dev, "child %s requested pci_set_powerstate\n", 469 device_get_nameunit(child)); 470 return (pci_set_powerstate(dev, state)); 471} 472 473static int 474vga_pci_get_powerstate(device_t dev, device_t child) 475{ 476 477 device_printf(dev, "child %s requested pci_get_powerstate\n", 478 device_get_nameunit(child)); 479 return (pci_get_powerstate(dev)); 480} 481 482static int 483vga_pci_assign_interrupt(device_t dev, device_t child) 484{ 485 486 device_printf(dev, "child %s requested pci_assign_interrupt\n", 487 device_get_nameunit(child)); 488 return (PCI_ASSIGN_INTERRUPT(device_get_parent(dev), dev)); 489} 490 491static int 492vga_pci_find_cap(device_t dev, device_t child, int capability, 493 int *capreg) 494{ 495 496 return (pci_find_cap(dev, capability, capreg)); 497} 498 499static int 500vga_pci_find_next_cap(device_t dev, device_t child, int capability, 501 int start, int *capreg) 502{ 503 504 return (pci_find_next_cap(dev, capability, start, capreg)); 505} 506 507static int 508vga_pci_find_extcap(device_t dev, device_t child, int capability, 509 int *capreg) 510{ 511 512 return (pci_find_extcap(dev, capability, capreg)); 513} 514 515static int 516vga_pci_find_next_extcap(device_t dev, device_t child, int capability, 517 int start, int *capreg) 518{ 519 520 return (pci_find_next_extcap(dev, capability, start, capreg)); 521} 522 523static int 524vga_pci_find_htcap(device_t dev, device_t child, int capability, 525 int *capreg) 526{ 527 528 return (pci_find_htcap(dev, capability, capreg)); 529} 530 531static int 532vga_pci_find_next_htcap(device_t dev, device_t child, int capability, 533 int start, int *capreg) 534{ 535 536 return (pci_find_next_htcap(dev, capability, start, capreg)); 537} 538 539static int 540vga_pci_alloc_msi(device_t dev, device_t child, int *count) 541{ 542 struct vga_pci_softc *sc; 543 int error; 544 545 sc = device_get_softc(dev); 546 if (sc->vga_msi_child != NULL) 547 return (EBUSY); 548 error = pci_alloc_msi(dev, count); 549 if (error == 0) 550 sc->vga_msi_child = child; 551 return (error); 552} 553 554static int 555vga_pci_alloc_msix(device_t dev, device_t child, int *count) 556{ 557 struct vga_pci_softc *sc; 558 int error; 559 560 sc = device_get_softc(dev); 561 if (sc->vga_msi_child != NULL) 562 return (EBUSY); 563 error = pci_alloc_msix(dev, count); 564 if (error == 0) 565 sc->vga_msi_child = child; 566 return (error); 567} 568 569static int 570vga_pci_remap_msix(device_t dev, device_t child, int count, 571 const u_int *vectors) 572{ 573 struct vga_pci_softc *sc; 574 575 sc = device_get_softc(dev); 576 if (sc->vga_msi_child != child) 577 return (ENXIO); 578 return (pci_remap_msix(dev, count, vectors)); 579} 580 581static int 582vga_pci_release_msi(device_t dev, device_t child) 583{ 584 struct vga_pci_softc *sc; 585 int error; 586 587 sc = device_get_softc(dev); 588 if (sc->vga_msi_child != child) 589 return (ENXIO); 590 error = pci_release_msi(dev); 591 if (error == 0) 592 sc->vga_msi_child = NULL; 593 return (error); 594} 595 596static int 597vga_pci_msi_count(device_t dev, device_t child) 598{ 599 600 return (pci_msi_count(dev)); 601} 602 603static int 604vga_pci_msix_count(device_t dev, device_t child) 605{ 606 607 return (pci_msix_count(dev)); 608} 609 610static bus_dma_tag_t 611vga_pci_get_dma_tag(device_t bus, device_t child) 612{ 613 614 return (bus_get_dma_tag(bus)); 615} 616 617static device_method_t vga_pci_methods[] = { 618 /* Device interface */ 619 DEVMETHOD(device_probe, vga_pci_probe), 620 DEVMETHOD(device_attach, vga_pci_attach), 621 DEVMETHOD(device_shutdown, bus_generic_shutdown), 622 DEVMETHOD(device_suspend, vga_pci_suspend), 623 DEVMETHOD(device_resume, vga_pci_resume), 624 625 /* Bus interface */ 626 DEVMETHOD(bus_read_ivar, vga_pci_read_ivar), 627 DEVMETHOD(bus_write_ivar, vga_pci_write_ivar), 628 DEVMETHOD(bus_setup_intr, vga_pci_setup_intr), 629 DEVMETHOD(bus_teardown_intr, vga_pci_teardown_intr), 630 DEVMETHOD(bus_alloc_resource, vga_pci_alloc_resource), 631 DEVMETHOD(bus_release_resource, vga_pci_release_resource), 632 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 633 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 634 DEVMETHOD(bus_get_dma_tag, vga_pci_get_dma_tag), 635 636 /* PCI interface */ 637 DEVMETHOD(pci_read_config, vga_pci_read_config), 638 DEVMETHOD(pci_write_config, vga_pci_write_config), 639 DEVMETHOD(pci_enable_busmaster, vga_pci_enable_busmaster), 640 DEVMETHOD(pci_disable_busmaster, vga_pci_disable_busmaster), 641 DEVMETHOD(pci_enable_io, vga_pci_enable_io), 642 DEVMETHOD(pci_disable_io, vga_pci_disable_io), 643 DEVMETHOD(pci_get_vpd_ident, vga_pci_get_vpd_ident), 644 DEVMETHOD(pci_get_vpd_readonly, vga_pci_get_vpd_readonly), 645 DEVMETHOD(pci_get_powerstate, vga_pci_get_powerstate), 646 DEVMETHOD(pci_set_powerstate, vga_pci_set_powerstate), 647 DEVMETHOD(pci_assign_interrupt, vga_pci_assign_interrupt), 648 DEVMETHOD(pci_find_cap, vga_pci_find_cap), 649 DEVMETHOD(pci_find_next_cap, vga_pci_find_next_cap), 650 DEVMETHOD(pci_find_extcap, vga_pci_find_extcap), 651 DEVMETHOD(pci_find_next_extcap, vga_pci_find_next_extcap), 652 DEVMETHOD(pci_find_htcap, vga_pci_find_htcap), 653 DEVMETHOD(pci_find_next_htcap, vga_pci_find_next_htcap), 654 DEVMETHOD(pci_alloc_msi, vga_pci_alloc_msi), 655 DEVMETHOD(pci_alloc_msix, vga_pci_alloc_msix), 656 DEVMETHOD(pci_remap_msix, vga_pci_remap_msix), 657 DEVMETHOD(pci_release_msi, vga_pci_release_msi), 658 DEVMETHOD(pci_msi_count, vga_pci_msi_count), 659 DEVMETHOD(pci_msix_count, vga_pci_msix_count), 660 661 { 0, 0 } 662}; 663 664static driver_t vga_pci_driver = { 665 "vgapci", 666 vga_pci_methods, 667 sizeof(struct vga_pci_softc), 668}; 669 670static devclass_t vga_devclass; 671 672DRIVER_MODULE(vgapci, pci, vga_pci_driver, vga_devclass, 0, 0); 673MODULE_DEPEND(vgapci, x86bios, 1, 1, 1); 674