vga_pci.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2005 John Baldwin <jhb@FreeBSD.org>
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD$");
   30 
   31 /*
   32  * Simple driver for PCI VGA display devices.  Drivers such as agp(4) and
   33  * drm(4) should attach as children of this device.
   34  *
   35  * XXX: The vgapci name is a hack until we somehow merge the isa vga driver
   36  * in or rename it.
   37  */
   38 
   39 #include <sys/param.h>
   40 #include <sys/bus.h>
   41 #include <sys/kernel.h>
   42 #include <sys/module.h>
   43 #include <sys/rman.h>
   44 #include <sys/sysctl.h>
   45 #include <sys/systm.h>
   46 
   47 #if defined(__amd64__) || defined(__i386__)
   48 #include <vm/vm.h>
   49 #include <vm/pmap.h>
   50 #endif
   51 
   52 #include <dev/pci/pcireg.h>
   53 #include <dev/pci/pcivar.h>
   54 
   55 #include <compat/x86bios/x86bios.h> /* To re-POST the card. */
   56 
   57 struct vga_resource {
   58         struct resource *vr_res;
   59         int     vr_refs;
   60 };
   61 
   62 struct vga_pci_softc {
   63         device_t        vga_msi_child;  /* Child driver using MSI. */
   64         struct vga_resource vga_bars[PCIR_MAX_BAR_0 + 1];
   65         struct vga_resource vga_bios;
   66 };
   67 
   68 SYSCTL_DECL(_hw_pci);
   69 
   70 static struct vga_resource *lookup_res(struct vga_pci_softc *sc, int rid);
   71 static struct resource *vga_pci_alloc_resource(device_t dev, device_t child,
   72     int type, int *rid, rman_res_t start, rman_res_t end, rman_res_t count,
   73     u_int flags);
   74 static int      vga_pci_release_resource(device_t dev, device_t child, int type,
   75     int rid, struct resource *r);
   76 
   77 int vga_pci_default_unit = -1;
   78 SYSCTL_INT(_hw_pci, OID_AUTO, default_vgapci_unit, CTLFLAG_RDTUN,
   79     &vga_pci_default_unit, -1, "Default VGA-compatible display");
   80 
   81 int
   82 vga_pci_is_boot_display(device_t dev)
   83 {
   84         int unit;
   85         device_t pcib;
   86         uint16_t config;
   87 
   88         /* Check that the given device is a video card */
   89         if ((pci_get_class(dev) != PCIC_DISPLAY &&
   90             (pci_get_class(dev) != PCIC_OLD ||
   91              pci_get_subclass(dev) != PCIS_OLD_VGA)))
   92                 return (0);
   93 
   94         unit = device_get_unit(dev);
   95 
   96         if (vga_pci_default_unit >= 0) {
   97                 /*
   98                  * The boot display device was determined by a previous
   99                  * call to this function, or the user forced it using
  100                  * the hw.pci.default_vgapci_unit tunable.
  101                  */
  102                 return (vga_pci_default_unit == unit);
  103         }
  104 
  105         /*
  106          * The primary video card used as a boot display must have the
  107          * "I/O" and "Memory Address Space Decoding" bits set in its
  108          * Command register.
  109          *
  110          * Furthermore, if the card is attached to a bridge, instead of
  111          * the root PCI bus, the bridge must have the "VGA Enable" bit
  112          * set in its Control register.
  113          */
  114 
  115         pcib = device_get_parent(device_get_parent(dev));
  116         if (device_get_devclass(device_get_parent(pcib)) ==
  117             devclass_find("pci")) {
  118                 /*
  119                  * The parent bridge is a PCI-to-PCI bridge: check the
  120                  * value of the "VGA Enable" bit.
  121                  */
  122                 config = pci_read_config(pcib, PCIR_BRIDGECTL_1, 2);
  123                 if ((config & PCIB_BCR_VGA_ENABLE) == 0)
  124                         return (0);
  125         }
  126 
  127         config = pci_read_config(dev, PCIR_COMMAND, 2);
  128         if ((config & (PCIM_CMD_PORTEN | PCIM_CMD_MEMEN)) == 0)
  129                 return (0);
  130 
  131         /*
  132          * Disable interrupts until a chipset driver is loaded for
  133          * this PCI device. Else unhandled display adapter interrupts
  134          * might freeze the CPU.
  135          */
  136         pci_write_config(dev, PCIR_COMMAND, config | PCIM_CMD_INTxDIS, 2);
  137 
  138         /* This video card is the boot display: record its unit number. */
  139         vga_pci_default_unit = unit;
  140         device_set_flags(dev, 1);
  141 
  142         return (1);
  143 }
  144 
  145 static void
  146 vga_pci_reset(device_t dev)
  147 {
  148         int ps;
  149         /*
  150          * FLR is unsupported on GPUs so attempt a power-management reset by cycling
  151          * the device in/out of D3 state.
  152          * PCI spec says we can only go into D3 state from D0 state.
  153          * Transition from D[12] into D0 before going to D3 state.
  154          */
  155         ps = pci_get_powerstate(dev);
  156         if (ps != PCI_POWERSTATE_D0 && ps != PCI_POWERSTATE_D3)
  157                 pci_set_powerstate(dev, PCI_POWERSTATE_D0);
  158         if (pci_get_powerstate(dev) != PCI_POWERSTATE_D3)
  159                 pci_set_powerstate(dev, PCI_POWERSTATE_D3);
  160         pci_set_powerstate(dev, ps);
  161 }
  162 
  163 void *
  164 vga_pci_map_bios(device_t dev, size_t *size)
  165 {
  166         struct vga_resource *vr;
  167         struct resource *res;
  168         device_t pcib;
  169         uint32_t rom_addr;
  170         uint16_t config;
  171         volatile unsigned char *bios;
  172         int i, rid, found;
  173 
  174 #if defined(__amd64__) || defined(__i386__)
  175         if (vga_pci_is_boot_display(dev)) {
  176                 /*
  177                  * On x86, the System BIOS copy the default display
  178                  * device's Video BIOS at a fixed location in system
  179                  * memory (0xC0000, 128 kBytes long) at boot time.
  180                  *
  181                  * We use this copy for the default boot device, because
  182                  * the original ROM may not be valid after boot.
  183                  */
  184 
  185                 *size = VGA_PCI_BIOS_SHADOW_SIZE;
  186                 return (pmap_mapbios(VGA_PCI_BIOS_SHADOW_ADDR, *size));
  187         }
  188 #endif
  189 
  190         pcib = device_get_parent(device_get_parent(dev));
  191         if (device_get_devclass(device_get_parent(pcib)) ==
  192             devclass_find("pci")) {
  193                 /*
  194                  * The parent bridge is a PCI-to-PCI bridge: check the
  195                  * value of the "VGA Enable" bit.
  196                  */
  197                 config = pci_read_config(pcib, PCIR_BRIDGECTL_1, 2);
  198                 if ((config & PCIB_BCR_VGA_ENABLE) == 0) {
  199                         config |= PCIB_BCR_VGA_ENABLE;
  200                         pci_write_config(pcib, PCIR_BRIDGECTL_1, config, 2);
  201                 }
  202         }
  203 
  204         switch(pci_read_config(dev, PCIR_HDRTYPE, 1)) {
  205         case PCIM_HDRTYPE_BRIDGE:
  206                 rid = PCIR_BIOS_1;
  207                 break;
  208         case PCIM_HDRTYPE_CARDBUS:
  209                 rid = 0;
  210                 break;
  211         default:
  212                 rid = PCIR_BIOS;
  213                 break;
  214         }
  215         if (rid == 0)
  216                 return (NULL);
  217         res = vga_pci_alloc_resource(dev, NULL, SYS_RES_MEMORY, &rid, 0,
  218             ~0, 1, RF_ACTIVE);
  219 
  220         if (res == NULL) {
  221                 device_printf(dev, "vga_pci_alloc_resource failed\n");
  222                 return (NULL);
  223         }
  224         bios = rman_get_virtual(res);
  225         *size = rman_get_size(res);
  226         for (found = i = 0; i < hz; i++) {
  227                 found = (bios[0] == 0x55 && bios[1] == 0xaa);
  228                 if (found)
  229                         break;
  230                 pause("vgabios", 1);
  231         }
  232         if (found)
  233                 return (__DEVOLATILE(void *, bios));
  234         if (bootverbose)
  235                 device_printf(dev, "initial ROM mapping failed -- resetting\n");
  236 
  237         /*
  238          * Enable ROM decode
  239          */
  240         vga_pci_reset(dev);
  241         rom_addr = pci_read_config(dev, rid, 4);
  242         rom_addr &= 0x7ff;
  243         rom_addr |= rman_get_start(res) | 0x1;
  244         pci_write_config(dev, rid, rom_addr, 4);
  245         vr = lookup_res(device_get_softc(dev), rid);
  246         vga_pci_release_resource(dev, NULL, SYS_RES_MEMORY, rid,
  247             vr->vr_res);
  248 
  249         /*
  250          * re-allocate
  251          */
  252         res = vga_pci_alloc_resource(dev, NULL, SYS_RES_MEMORY, &rid, 0,
  253             ~0, 1, RF_ACTIVE);
  254         if (res == NULL) {
  255                 device_printf(dev, "vga_pci_alloc_resource failed\n");
  256                 return (NULL);
  257         }
  258         bios = rman_get_virtual(res);
  259         *size = rman_get_size(res);
  260         for (found = i = 0; i < 3*hz; i++) {
  261                 found = (bios[0] == 0x55 && bios[1] == 0xaa);
  262                 if (found)
  263                         break;
  264                 pause("vgabios", 1);
  265         }
  266         if (found)
  267                 return (__DEVOLATILE(void *, bios));
  268         device_printf(dev, "ROM mapping failed\n");
  269         vr = lookup_res(device_get_softc(dev), rid);
  270         vga_pci_release_resource(dev, NULL, SYS_RES_MEMORY, rid,
  271             vr->vr_res);
  272         return (NULL);
  273 }
  274 
  275 void
  276 vga_pci_unmap_bios(device_t dev, void *bios)
  277 {
  278         struct vga_resource *vr;
  279         int rid;
  280 
  281         if (bios == NULL) {
  282                 return;
  283         }
  284 
  285 #if defined(__amd64__) || defined(__i386__)
  286         if (vga_pci_is_boot_display(dev)) {
  287                 /* We mapped the BIOS shadow copy located at 0xC0000. */
  288                 pmap_unmapdev(bios, VGA_PCI_BIOS_SHADOW_SIZE);
  289 
  290                 return;
  291         }
  292 #endif
  293         switch(pci_read_config(dev, PCIR_HDRTYPE, 1)) {
  294         case PCIM_HDRTYPE_BRIDGE:
  295                 rid = PCIR_BIOS_1;
  296                 break;
  297         case PCIM_HDRTYPE_CARDBUS:
  298                 rid = 0;
  299                 break;
  300         default:
  301                 rid = PCIR_BIOS;
  302                 break;
  303         }
  304         if (rid == 0)
  305                 return;
  306         /*
  307          * Look up the PCIR_BIOS resource in our softc.  It should match
  308          * the address we returned previously.
  309          */
  310         vr = lookup_res(device_get_softc(dev), rid);
  311         KASSERT(vr->vr_res != NULL, ("vga_pci_unmap_bios: bios not mapped"));
  312         KASSERT(rman_get_virtual(vr->vr_res) == bios,
  313             ("vga_pci_unmap_bios: mismatch"));
  314         vga_pci_release_resource(dev, NULL, SYS_RES_MEMORY, rid,
  315             vr->vr_res);
  316 }
  317 
  318 int
  319 vga_pci_repost(device_t dev)
  320 {
  321 #if defined(__amd64__) || defined(__i386__)
  322         x86regs_t regs;
  323 
  324         if (!vga_pci_is_boot_display(dev))
  325                 return (EINVAL);
  326 
  327         if (x86bios_get_orm(VGA_PCI_BIOS_SHADOW_ADDR) == NULL)
  328                 return (ENOTSUP);
  329 
  330         x86bios_init_regs(&regs);
  331 
  332         regs.R_AH = pci_get_bus(dev);
  333         regs.R_AL = (pci_get_slot(dev) << 3) | (pci_get_function(dev) & 0x07);
  334         regs.R_DL = 0x80;
  335 
  336         device_printf(dev, "REPOSTing\n");
  337         x86bios_call(&regs, X86BIOS_PHYSTOSEG(VGA_PCI_BIOS_SHADOW_ADDR + 3),
  338             X86BIOS_PHYSTOOFF(VGA_PCI_BIOS_SHADOW_ADDR + 3));
  339 
  340         x86bios_get_intr(0x10);
  341 
  342         return (0);
  343 #else
  344         return (ENOTSUP);
  345 #endif
  346 }
  347 
  348 static int
  349 vga_pci_probe(device_t dev)
  350 {
  351 
  352         switch (pci_get_class(dev)) {
  353         case PCIC_DISPLAY:
  354                 break;
  355         case PCIC_OLD:
  356                 if (pci_get_subclass(dev) != PCIS_OLD_VGA)
  357                         return (ENXIO);
  358                 break;
  359         default:
  360                 return (ENXIO);
  361         }
  362 
  363         /* Probe default display. */
  364         vga_pci_is_boot_display(dev);
  365 
  366         device_set_desc(dev, "VGA-compatible display");
  367         return (BUS_PROBE_GENERIC);
  368 }
  369 
  370 static int
  371 vga_pci_attach(device_t dev)
  372 {
  373 
  374         bus_generic_probe(dev);
  375 
  376         /* Always create a drm child for now to make it easier on drm. */
  377         device_add_child(dev, "drm", -1);
  378         device_add_child(dev, "drmn", -1);
  379         bus_generic_attach(dev);
  380 
  381         if (vga_pci_is_boot_display(dev))
  382                 device_printf(dev, "Boot video device\n");
  383 
  384         return (0);
  385 }
  386 
  387 static int
  388 vga_pci_suspend(device_t dev)
  389 {
  390 
  391         return (bus_generic_suspend(dev));
  392 }
  393 
  394 static int
  395 vga_pci_detach(device_t dev)
  396 {
  397         int error; 
  398 
  399         error = bus_generic_detach(dev);
  400         if (error == 0)
  401                 error = device_delete_children(dev);
  402         return (error);
  403 }
  404 
  405 static int
  406 vga_pci_resume(device_t dev)
  407 {
  408 
  409         return (bus_generic_resume(dev));
  410 }
  411 
  412 /* Bus interface. */
  413 
  414 static int
  415 vga_pci_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
  416 {
  417 
  418         return (BUS_READ_IVAR(device_get_parent(dev), dev, which, result));
  419 }
  420 
  421 static int
  422 vga_pci_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
  423 {
  424 
  425         return (EINVAL);
  426 }
  427 
  428 static int
  429 vga_pci_setup_intr(device_t dev, device_t child, struct resource *irq,
  430     int flags, driver_filter_t *filter, driver_intr_t *intr, void *arg,
  431     void **cookiep)
  432 {
  433         return (BUS_SETUP_INTR(device_get_parent(dev), dev, irq, flags,
  434             filter, intr, arg, cookiep));
  435 }
  436 
  437 static int
  438 vga_pci_teardown_intr(device_t dev, device_t child, struct resource *irq,
  439     void *cookie)
  440 {
  441         return (BUS_TEARDOWN_INTR(device_get_parent(dev), dev, irq, cookie));
  442 }
  443 
  444 static struct vga_resource *
  445 lookup_res(struct vga_pci_softc *sc, int rid)
  446 {
  447         int bar;
  448 
  449         if (rid == PCIR_BIOS)
  450                 return (&sc->vga_bios);
  451         bar = PCI_RID2BAR(rid);
  452         if (bar >= 0 && bar <= PCIR_MAX_BAR_0)
  453                 return (&sc->vga_bars[bar]);
  454         return (NULL);
  455 }
  456 
  457 static struct resource *
  458 vga_pci_alloc_resource(device_t dev, device_t child, int type, int *rid,
  459     rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
  460 {
  461         struct vga_resource *vr;
  462 
  463         switch (type) {
  464         case SYS_RES_MEMORY:
  465         case SYS_RES_IOPORT:
  466                 /*
  467                  * For BARs, we cache the resource so that we only allocate it
  468                  * from the PCI bus once.
  469                  */
  470                 vr = lookup_res(device_get_softc(dev), *rid);
  471                 if (vr == NULL)
  472                         return (NULL);
  473                 if (vr->vr_res == NULL)
  474                         vr->vr_res = bus_alloc_resource(dev, type, rid, start,
  475                             end, count, flags);
  476                 if (vr->vr_res != NULL)
  477                         vr->vr_refs++;
  478                 return (vr->vr_res);
  479         }
  480         return (bus_alloc_resource(dev, type, rid, start, end, count, flags));
  481 }
  482 
  483 static int
  484 vga_pci_release_resource(device_t dev, device_t child, int type, int rid,
  485     struct resource *r)
  486 {
  487         struct vga_resource *vr;
  488         int error;
  489 
  490         switch (type) {
  491         case SYS_RES_MEMORY:
  492         case SYS_RES_IOPORT:
  493                 /*
  494                  * For BARs, we release the resource from the PCI bus
  495                  * when the last child reference goes away.
  496                  */
  497                 vr = lookup_res(device_get_softc(dev), rid);
  498                 if (vr == NULL)
  499                         return (EINVAL);
  500                 if (vr->vr_res == NULL)
  501                         return (EINVAL);
  502                 KASSERT(vr->vr_res == r, ("vga_pci resource mismatch"));
  503                 if (vr->vr_refs > 1) {
  504                         vr->vr_refs--;
  505                         return (0);
  506                 }
  507                 KASSERT(vr->vr_refs > 0,
  508                     ("vga_pci resource reference count underflow"));
  509                 error = bus_release_resource(dev, type, rid, r);
  510                 if (error == 0) {
  511                         vr->vr_res = NULL;
  512                         vr->vr_refs = 0;
  513                 }
  514                 return (error);
  515         }
  516 
  517         return (bus_release_resource(dev, type, rid, r));
  518 }
  519 
  520 /* PCI interface. */
  521 
  522 static uint32_t
  523 vga_pci_read_config(device_t dev, device_t child, int reg, int width)
  524 {
  525 
  526         return (pci_read_config(dev, reg, width));
  527 }
  528 
  529 static void
  530 vga_pci_write_config(device_t dev, device_t child, int reg,
  531     uint32_t val, int width)
  532 {
  533 
  534         pci_write_config(dev, reg, val, width);
  535 }
  536 
  537 static int
  538 vga_pci_enable_busmaster(device_t dev, device_t child)
  539 {
  540 
  541         return (pci_enable_busmaster(dev));
  542 }
  543 
  544 static int
  545 vga_pci_disable_busmaster(device_t dev, device_t child)
  546 {
  547 
  548         return (pci_disable_busmaster(dev));
  549 }
  550 
  551 static int
  552 vga_pci_enable_io(device_t dev, device_t child, int space)
  553 {
  554 
  555         device_printf(dev, "child %s requested pci_enable_io\n",
  556             device_get_nameunit(child));
  557         return (pci_enable_io(dev, space));
  558 }
  559 
  560 static int
  561 vga_pci_disable_io(device_t dev, device_t child, int space)
  562 {
  563 
  564         device_printf(dev, "child %s requested pci_disable_io\n",
  565             device_get_nameunit(child));
  566         return (pci_disable_io(dev, space));
  567 }
  568 
  569 static int
  570 vga_pci_get_vpd_ident(device_t dev, device_t child, const char **identptr)
  571 {
  572 
  573         return (pci_get_vpd_ident(dev, identptr));
  574 }
  575 
  576 static int
  577 vga_pci_get_vpd_readonly(device_t dev, device_t child, const char *kw,
  578     const char **vptr)
  579 {
  580 
  581         return (pci_get_vpd_readonly(dev, kw, vptr));
  582 }
  583 
  584 static int
  585 vga_pci_set_powerstate(device_t dev, device_t child, int state)
  586 {
  587 
  588         device_printf(dev, "child %s requested pci_set_powerstate\n",
  589             device_get_nameunit(child));
  590         return (pci_set_powerstate(dev, state));
  591 }
  592 
  593 static int
  594 vga_pci_get_powerstate(device_t dev, device_t child)
  595 {
  596 
  597         device_printf(dev, "child %s requested pci_get_powerstate\n",
  598             device_get_nameunit(child));
  599         return (pci_get_powerstate(dev));
  600 }
  601 
  602 static int
  603 vga_pci_assign_interrupt(device_t dev, device_t child)
  604 {
  605 
  606         device_printf(dev, "child %s requested pci_assign_interrupt\n",
  607             device_get_nameunit(child));
  608         return (PCI_ASSIGN_INTERRUPT(device_get_parent(dev), dev));
  609 }
  610 
  611 static int
  612 vga_pci_find_cap(device_t dev, device_t child, int capability,
  613     int *capreg)
  614 {
  615 
  616         return (pci_find_cap(dev, capability, capreg));
  617 }
  618 
  619 static int
  620 vga_pci_find_next_cap(device_t dev, device_t child, int capability,
  621     int start, int *capreg)
  622 {
  623 
  624         return (pci_find_next_cap(dev, capability, start, capreg));
  625 }
  626 
  627 static int
  628 vga_pci_find_extcap(device_t dev, device_t child, int capability,
  629     int *capreg)
  630 {
  631 
  632         return (pci_find_extcap(dev, capability, capreg));
  633 }
  634 
  635 static int
  636 vga_pci_find_next_extcap(device_t dev, device_t child, int capability,
  637     int start, int *capreg)
  638 {
  639 
  640         return (pci_find_next_extcap(dev, capability, start, capreg));
  641 }
  642 
  643 static int
  644 vga_pci_find_htcap(device_t dev, device_t child, int capability,
  645     int *capreg)
  646 {
  647 
  648         return (pci_find_htcap(dev, capability, capreg));
  649 }
  650 
  651 static int
  652 vga_pci_find_next_htcap(device_t dev, device_t child, int capability,
  653     int start, int *capreg)
  654 {
  655 
  656         return (pci_find_next_htcap(dev, capability, start, capreg));
  657 }
  658 
  659 static int
  660 vga_pci_alloc_msi(device_t dev, device_t child, int *count)
  661 {
  662         struct vga_pci_softc *sc;
  663         int error;
  664 
  665         sc = device_get_softc(dev);
  666         if (sc->vga_msi_child != NULL)
  667                 return (EBUSY);
  668         error = pci_alloc_msi(dev, count);
  669         if (error == 0)
  670                 sc->vga_msi_child = child;
  671         return (error);
  672 }
  673 
  674 static int
  675 vga_pci_alloc_msix(device_t dev, device_t child, int *count)
  676 {
  677         struct vga_pci_softc *sc;
  678         int error;
  679 
  680         sc = device_get_softc(dev);
  681         if (sc->vga_msi_child != NULL)
  682                 return (EBUSY);
  683         error = pci_alloc_msix(dev, count);
  684         if (error == 0)
  685                 sc->vga_msi_child = child;
  686         return (error);
  687 }
  688 
  689 static int
  690 vga_pci_remap_msix(device_t dev, device_t child, int count,
  691     const u_int *vectors)
  692 {
  693         struct vga_pci_softc *sc;
  694 
  695         sc = device_get_softc(dev);
  696         if (sc->vga_msi_child != child)
  697                 return (ENXIO);
  698         return (pci_remap_msix(dev, count, vectors));
  699 }
  700 
  701 static int
  702 vga_pci_release_msi(device_t dev, device_t child)
  703 {
  704         struct vga_pci_softc *sc;
  705         int error;
  706 
  707         sc = device_get_softc(dev);
  708         if (sc->vga_msi_child != child)
  709                 return (ENXIO);
  710         error = pci_release_msi(dev);
  711         if (error == 0)
  712                 sc->vga_msi_child = NULL;
  713         return (error);
  714 }
  715 
  716 static int
  717 vga_pci_msi_count(device_t dev, device_t child)
  718 {
  719 
  720         return (pci_msi_count(dev));
  721 }
  722 
  723 static int
  724 vga_pci_msix_count(device_t dev, device_t child)
  725 {
  726 
  727         return (pci_msix_count(dev));
  728 }
  729 
  730 static bus_dma_tag_t
  731 vga_pci_get_dma_tag(device_t bus, device_t child)
  732 {
  733 
  734         return (bus_get_dma_tag(bus));
  735 }
  736 
  737 static device_method_t vga_pci_methods[] = {
  738         /* Device interface */
  739         DEVMETHOD(device_probe,         vga_pci_probe),
  740         DEVMETHOD(device_attach,        vga_pci_attach),
  741         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  742         DEVMETHOD(device_suspend,       vga_pci_suspend),
  743         DEVMETHOD(device_detach,        vga_pci_detach),
  744         DEVMETHOD(device_resume,        vga_pci_resume),
  745 
  746         /* Bus interface */
  747         DEVMETHOD(bus_read_ivar,        vga_pci_read_ivar),
  748         DEVMETHOD(bus_write_ivar,       vga_pci_write_ivar),
  749         DEVMETHOD(bus_setup_intr,       vga_pci_setup_intr),
  750         DEVMETHOD(bus_teardown_intr,    vga_pci_teardown_intr),
  751         DEVMETHOD(bus_alloc_resource,   vga_pci_alloc_resource),
  752         DEVMETHOD(bus_release_resource, vga_pci_release_resource),
  753         DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
  754         DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
  755         DEVMETHOD(bus_get_dma_tag,      vga_pci_get_dma_tag),
  756 
  757         /* PCI interface */
  758         DEVMETHOD(pci_read_config,      vga_pci_read_config),
  759         DEVMETHOD(pci_write_config,     vga_pci_write_config),
  760         DEVMETHOD(pci_enable_busmaster, vga_pci_enable_busmaster),
  761         DEVMETHOD(pci_disable_busmaster, vga_pci_disable_busmaster),
  762         DEVMETHOD(pci_enable_io,        vga_pci_enable_io),
  763         DEVMETHOD(pci_disable_io,       vga_pci_disable_io),
  764         DEVMETHOD(pci_get_vpd_ident,    vga_pci_get_vpd_ident),
  765         DEVMETHOD(pci_get_vpd_readonly, vga_pci_get_vpd_readonly),
  766         DEVMETHOD(pci_get_powerstate,   vga_pci_get_powerstate),
  767         DEVMETHOD(pci_set_powerstate,   vga_pci_set_powerstate),
  768         DEVMETHOD(pci_assign_interrupt, vga_pci_assign_interrupt),
  769         DEVMETHOD(pci_find_cap,         vga_pci_find_cap),
  770         DEVMETHOD(pci_find_next_cap,    vga_pci_find_next_cap),
  771         DEVMETHOD(pci_find_extcap,      vga_pci_find_extcap),
  772         DEVMETHOD(pci_find_next_extcap, vga_pci_find_next_extcap),
  773         DEVMETHOD(pci_find_htcap,       vga_pci_find_htcap),
  774         DEVMETHOD(pci_find_next_htcap,  vga_pci_find_next_htcap),
  775         DEVMETHOD(pci_alloc_msi,        vga_pci_alloc_msi),
  776         DEVMETHOD(pci_alloc_msix,       vga_pci_alloc_msix),
  777         DEVMETHOD(pci_remap_msix,       vga_pci_remap_msix),
  778         DEVMETHOD(pci_release_msi,      vga_pci_release_msi),
  779         DEVMETHOD(pci_msi_count,        vga_pci_msi_count),
  780         DEVMETHOD(pci_msix_count,       vga_pci_msix_count),
  781         { 0, 0 }
  782 };
  783 
  784 static driver_t vga_pci_driver = {
  785         "vgapci",
  786         vga_pci_methods,
  787         sizeof(struct vga_pci_softc),
  788 };
  789 
  790 DRIVER_MODULE(vgapci, pci, vga_pci_driver, 0, 0);
  791 MODULE_DEPEND(vgapci, x86bios, 1, 1, 1);
Cache object: 72781e86c140a607ba1254354713cdb5
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FreeBSD/Linux Kernel Cross Reference sys/dev/pci/vga_pci.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/pci/vga_pci.c
