The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/dev/agp/agp.c

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    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 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/8.0/sys/dev/agp/agp.c 191057 2009-04-14 13:11:34Z ed $");
   29 
   30 #include "opt_agp.h"
   31 #include "opt_bus.h"
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/malloc.h>
   36 #include <sys/kernel.h>
   37 #include <sys/module.h>
   38 #include <sys/bus.h>
   39 #include <sys/conf.h>
   40 #include <sys/ioccom.h>
   41 #include <sys/agpio.h>
   42 #include <sys/lock.h>
   43 #include <sys/mutex.h>
   44 #include <sys/proc.h>
   45 
   46 #include <dev/agp/agppriv.h>
   47 #include <dev/agp/agpvar.h>
   48 #include <dev/agp/agpreg.h>
   49 #include <dev/pci/pcivar.h>
   50 #include <dev/pci/pcireg.h>
   51 
   52 #include <vm/vm.h>
   53 #include <vm/vm_object.h>
   54 #include <vm/vm_page.h>
   55 #include <vm/vm_pageout.h>
   56 #include <vm/pmap.h>
   57 
   58 #include <machine/md_var.h>
   59 #include <machine/bus.h>
   60 #include <machine/resource.h>
   61 #include <sys/rman.h>
   62 
   63 MODULE_VERSION(agp, 1);
   64 
   65 MALLOC_DEFINE(M_AGP, "agp", "AGP data structures");
   66 
   67                                 /* agp_drv.c */
   68 static d_open_t agp_open;
   69 static d_close_t agp_close;
   70 static d_ioctl_t agp_ioctl;
   71 static d_mmap_t agp_mmap;
   72 
   73 static struct cdevsw agp_cdevsw = {
   74         .d_version =    D_VERSION,
   75         .d_flags =      D_NEEDGIANT,
   76         .d_open =       agp_open,
   77         .d_close =      agp_close,
   78         .d_ioctl =      agp_ioctl,
   79         .d_mmap =       agp_mmap,
   80         .d_name =       "agp",
   81 };
   82 
   83 static devclass_t agp_devclass;
   84 
   85 /* Helper functions for implementing chipset mini drivers. */
   86 
   87 void
   88 agp_flush_cache()
   89 {
   90 #if defined(__i386__) || defined(__amd64__)
   91         wbinvd();
   92 #endif
   93 }
   94 
   95 u_int8_t
   96 agp_find_caps(device_t dev)
   97 {
   98         int capreg;
   99 
  100 
  101         if (pci_find_extcap(dev, PCIY_AGP, &capreg) != 0)
  102                 capreg = 0;
  103         return (capreg);
  104 }
  105 
  106 /*
  107  * Find an AGP display device (if any).
  108  */
  109 static device_t
  110 agp_find_display(void)
  111 {
  112         devclass_t pci = devclass_find("pci");
  113         device_t bus, dev = 0;
  114         device_t *kids;
  115         int busnum, numkids, i;
  116 
  117         for (busnum = 0; busnum < devclass_get_maxunit(pci); busnum++) {
  118                 bus = devclass_get_device(pci, busnum);
  119                 if (!bus)
  120                         continue;
  121                 if (device_get_children(bus, &kids, &numkids) != 0)
  122                         continue;
  123                 for (i = 0; i < numkids; i++) {
  124                         dev = kids[i];
  125                         if (pci_get_class(dev) == PCIC_DISPLAY
  126                             && pci_get_subclass(dev) == PCIS_DISPLAY_VGA)
  127                                 if (agp_find_caps(dev)) {
  128                                         free(kids, M_TEMP);
  129                                         return dev;
  130                                 }
  131                                         
  132                 }
  133                 free(kids, M_TEMP);
  134         }
  135 
  136         return 0;
  137 }
  138 
  139 struct agp_gatt *
  140 agp_alloc_gatt(device_t dev)
  141 {
  142         u_int32_t apsize = AGP_GET_APERTURE(dev);
  143         u_int32_t entries = apsize >> AGP_PAGE_SHIFT;
  144         struct agp_gatt *gatt;
  145 
  146         if (bootverbose)
  147                 device_printf(dev,
  148                               "allocating GATT for aperture of size %dM\n",
  149                               apsize / (1024*1024));
  150 
  151         if (entries == 0) {
  152                 device_printf(dev, "bad aperture size\n");
  153                 return NULL;
  154         }
  155 
  156         gatt = malloc(sizeof(struct agp_gatt), M_AGP, M_NOWAIT);
  157         if (!gatt)
  158                 return 0;
  159 
  160         gatt->ag_entries = entries;
  161         gatt->ag_virtual = contigmalloc(entries * sizeof(u_int32_t), M_AGP, 0,
  162                                         0, ~0, PAGE_SIZE, 0);
  163         if (!gatt->ag_virtual) {
  164                 if (bootverbose)
  165                         device_printf(dev, "contiguous allocation failed\n");
  166                 free(gatt, M_AGP);
  167                 return 0;
  168         }
  169         bzero(gatt->ag_virtual, entries * sizeof(u_int32_t));
  170         gatt->ag_physical = vtophys((vm_offset_t) gatt->ag_virtual);
  171         agp_flush_cache();
  172 
  173         return gatt;
  174 }
  175 
  176 void
  177 agp_free_gatt(struct agp_gatt *gatt)
  178 {
  179         contigfree(gatt->ag_virtual,
  180                    gatt->ag_entries * sizeof(u_int32_t), M_AGP);
  181         free(gatt, M_AGP);
  182 }
  183 
  184 static u_int agp_max[][2] = {
  185         {0,     0},
  186         {32,    4},
  187         {64,    28},
  188         {128,   96},
  189         {256,   204},
  190         {512,   440},
  191         {1024,  942},
  192         {2048,  1920},
  193         {4096,  3932}
  194 };
  195 #define agp_max_size    (sizeof(agp_max) / sizeof(agp_max[0]))
  196 
  197 /**
  198  * Sets the PCI resource which represents the AGP aperture.
  199  *
  200  * If not called, the default AGP aperture resource of AGP_APBASE will
  201  * be used.  Must be called before agp_generic_attach().
  202  */
  203 void
  204 agp_set_aperture_resource(device_t dev, int rid)
  205 {
  206         struct agp_softc *sc = device_get_softc(dev);
  207 
  208         sc->as_aperture_rid = rid;
  209 }
  210 
  211 int
  212 agp_generic_attach(device_t dev)
  213 {
  214         struct agp_softc *sc = device_get_softc(dev);
  215         int i;
  216         u_int memsize;
  217 
  218         /*
  219          * Find and map the aperture, RF_SHAREABLE for DRM but not RF_ACTIVE
  220          * because the kernel doesn't need to map it.
  221          */
  222         if (sc->as_aperture_rid == 0)
  223                 sc->as_aperture_rid = AGP_APBASE;
  224 
  225         sc->as_aperture = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
  226             &sc->as_aperture_rid, RF_SHAREABLE);
  227         if (!sc->as_aperture)
  228                 return ENOMEM;
  229 
  230         /*
  231          * Work out an upper bound for agp memory allocation. This
  232          * uses a heurisitc table from the Linux driver.
  233          */
  234         memsize = ptoa(Maxmem) >> 20;
  235         for (i = 0; i < agp_max_size; i++) {
  236                 if (memsize <= agp_max[i][0])
  237                         break;
  238         }
  239         if (i == agp_max_size) i = agp_max_size - 1;
  240         sc->as_maxmem = agp_max[i][1] << 20U;
  241 
  242         /*
  243          * The lock is used to prevent re-entry to
  244          * agp_generic_bind_memory() since that function can sleep.
  245          */
  246         mtx_init(&sc->as_lock, "agp lock", NULL, MTX_DEF);
  247 
  248         /*
  249          * Initialise stuff for the userland device.
  250          */
  251         agp_devclass = devclass_find("agp");
  252         TAILQ_INIT(&sc->as_memory);
  253         sc->as_nextid = 1;
  254 
  255         sc->as_devnode = make_dev(&agp_cdevsw,
  256             0, UID_ROOT, GID_WHEEL, 0600, "agpgart");
  257         sc->as_devnode->si_drv1 = dev;
  258 
  259         return 0;
  260 }
  261 
  262 void
  263 agp_free_cdev(device_t dev)
  264 {
  265         struct agp_softc *sc = device_get_softc(dev);
  266 
  267         destroy_dev(sc->as_devnode);
  268 }
  269 
  270 void
  271 agp_free_res(device_t dev)
  272 {
  273         struct agp_softc *sc = device_get_softc(dev);
  274 
  275         bus_release_resource(dev, SYS_RES_MEMORY, sc->as_aperture_rid,
  276             sc->as_aperture);
  277         mtx_destroy(&sc->as_lock);
  278         agp_flush_cache();
  279 }
  280 
  281 int
  282 agp_generic_detach(device_t dev)
  283 {
  284 
  285         agp_free_cdev(dev);
  286         agp_free_res(dev);
  287         return 0;
  288 }
  289 
  290 /**
  291  * Default AGP aperture size detection which simply returns the size of
  292  * the aperture's PCI resource.
  293  */
  294 u_int32_t
  295 agp_generic_get_aperture(device_t dev)
  296 {
  297         struct agp_softc *sc = device_get_softc(dev);
  298 
  299         return rman_get_size(sc->as_aperture);
  300 }
  301 
  302 /**
  303  * Default AGP aperture size setting function, which simply doesn't allow
  304  * changes to resource size.
  305  */
  306 int
  307 agp_generic_set_aperture(device_t dev, u_int32_t aperture)
  308 {
  309         u_int32_t current_aperture;
  310 
  311         current_aperture = AGP_GET_APERTURE(dev);
  312         if (current_aperture != aperture)
  313                 return EINVAL;
  314         else
  315                 return 0;
  316 }
  317 
  318 /*
  319  * This does the enable logic for v3, with the same topology
  320  * restrictions as in place for v2 -- one bus, one device on the bus.
  321  */
  322 static int
  323 agp_v3_enable(device_t dev, device_t mdev, u_int32_t mode)
  324 {
  325         u_int32_t tstatus, mstatus;
  326         u_int32_t command;
  327         int rq, sba, fw, rate, arqsz, cal;
  328 
  329         tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  330         mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
  331 
  332         /* Set RQ to the min of mode, tstatus and mstatus */
  333         rq = AGP_MODE_GET_RQ(mode);
  334         if (AGP_MODE_GET_RQ(tstatus) < rq)
  335                 rq = AGP_MODE_GET_RQ(tstatus);
  336         if (AGP_MODE_GET_RQ(mstatus) < rq)
  337                 rq = AGP_MODE_GET_RQ(mstatus);
  338 
  339         /*
  340          * ARQSZ - Set the value to the maximum one.
  341          * Don't allow the mode register to override values.
  342          */
  343         arqsz = AGP_MODE_GET_ARQSZ(mode);
  344         if (AGP_MODE_GET_ARQSZ(tstatus) > rq)
  345                 rq = AGP_MODE_GET_ARQSZ(tstatus);
  346         if (AGP_MODE_GET_ARQSZ(mstatus) > rq)
  347                 rq = AGP_MODE_GET_ARQSZ(mstatus);
  348 
  349         /* Calibration cycle - don't allow override by mode register */
  350         cal = AGP_MODE_GET_CAL(tstatus);
  351         if (AGP_MODE_GET_CAL(mstatus) < cal)
  352                 cal = AGP_MODE_GET_CAL(mstatus);
  353 
  354         /* SBA must be supported for AGP v3. */
  355         sba = 1;
  356 
  357         /* Set FW if all three support it. */
  358         fw = (AGP_MODE_GET_FW(tstatus)
  359                & AGP_MODE_GET_FW(mstatus)
  360                & AGP_MODE_GET_FW(mode));
  361         
  362         /* Figure out the max rate */
  363         rate = (AGP_MODE_GET_RATE(tstatus)
  364                 & AGP_MODE_GET_RATE(mstatus)
  365                 & AGP_MODE_GET_RATE(mode));
  366         if (rate & AGP_MODE_V3_RATE_8x)
  367                 rate = AGP_MODE_V3_RATE_8x;
  368         else
  369                 rate = AGP_MODE_V3_RATE_4x;
  370         if (bootverbose)
  371                 device_printf(dev, "Setting AGP v3 mode %d\n", rate * 4);
  372 
  373         pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, 0, 4);
  374 
  375         /* Construct the new mode word and tell the hardware */
  376         command = 0;
  377         command = AGP_MODE_SET_RQ(0, rq);
  378         command = AGP_MODE_SET_ARQSZ(command, arqsz);
  379         command = AGP_MODE_SET_CAL(command, cal);
  380         command = AGP_MODE_SET_SBA(command, sba);
  381         command = AGP_MODE_SET_FW(command, fw);
  382         command = AGP_MODE_SET_RATE(command, rate);
  383         command = AGP_MODE_SET_MODE_3(command, 1);
  384         command = AGP_MODE_SET_AGP(command, 1);
  385         pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4);
  386         pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4);
  387 
  388         return 0;
  389 }
  390 
  391 static int
  392 agp_v2_enable(device_t dev, device_t mdev, u_int32_t mode)
  393 {
  394         u_int32_t tstatus, mstatus;
  395         u_int32_t command;
  396         int rq, sba, fw, rate;
  397 
  398         tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  399         mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
  400 
  401         /* Set RQ to the min of mode, tstatus and mstatus */
  402         rq = AGP_MODE_GET_RQ(mode);
  403         if (AGP_MODE_GET_RQ(tstatus) < rq)
  404                 rq = AGP_MODE_GET_RQ(tstatus);
  405         if (AGP_MODE_GET_RQ(mstatus) < rq)
  406                 rq = AGP_MODE_GET_RQ(mstatus);
  407 
  408         /* Set SBA if all three can deal with SBA */
  409         sba = (AGP_MODE_GET_SBA(tstatus)
  410                & AGP_MODE_GET_SBA(mstatus)
  411                & AGP_MODE_GET_SBA(mode));
  412 
  413         /* Similar for FW */
  414         fw = (AGP_MODE_GET_FW(tstatus)
  415                & AGP_MODE_GET_FW(mstatus)
  416                & AGP_MODE_GET_FW(mode));
  417 
  418         /* Figure out the max rate */
  419         rate = (AGP_MODE_GET_RATE(tstatus)
  420                 & AGP_MODE_GET_RATE(mstatus)
  421                 & AGP_MODE_GET_RATE(mode));
  422         if (rate & AGP_MODE_V2_RATE_4x)
  423                 rate = AGP_MODE_V2_RATE_4x;
  424         else if (rate & AGP_MODE_V2_RATE_2x)
  425                 rate = AGP_MODE_V2_RATE_2x;
  426         else
  427                 rate = AGP_MODE_V2_RATE_1x;
  428         if (bootverbose)
  429                 device_printf(dev, "Setting AGP v2 mode %d\n", rate);
  430 
  431         /* Construct the new mode word and tell the hardware */
  432         command = 0;
  433         command = AGP_MODE_SET_RQ(0, rq);
  434         command = AGP_MODE_SET_SBA(command, sba);
  435         command = AGP_MODE_SET_FW(command, fw);
  436         command = AGP_MODE_SET_RATE(command, rate);
  437         command = AGP_MODE_SET_AGP(command, 1);
  438         pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4);
  439         pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4);
  440 
  441         return 0;
  442 }
  443 
  444 int
  445 agp_generic_enable(device_t dev, u_int32_t mode)
  446 {
  447         device_t mdev = agp_find_display();
  448         u_int32_t tstatus, mstatus;
  449 
  450         if (!mdev) {
  451                 AGP_DPF("can't find display\n");
  452                 return ENXIO;
  453         }
  454 
  455         tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  456         mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
  457 
  458         /*
  459          * Check display and bridge for AGP v3 support.  AGP v3 allows
  460          * more variety in topology than v2, e.g. multiple AGP devices
  461          * attached to one bridge, or multiple AGP bridges in one
  462          * system.  This doesn't attempt to address those situations,
  463          * but should work fine for a classic single AGP slot system
  464          * with AGP v3.
  465          */
  466         if (AGP_MODE_GET_MODE_3(mode) &&
  467             AGP_MODE_GET_MODE_3(tstatus) &&
  468             AGP_MODE_GET_MODE_3(mstatus))
  469                 return (agp_v3_enable(dev, mdev, mode));
  470         else
  471                 return (agp_v2_enable(dev, mdev, mode));            
  472 }
  473 
  474 struct agp_memory *
  475 agp_generic_alloc_memory(device_t dev, int type, vm_size_t size)
  476 {
  477         struct agp_softc *sc = device_get_softc(dev);
  478         struct agp_memory *mem;
  479 
  480         if ((size & (AGP_PAGE_SIZE - 1)) != 0)
  481                 return 0;
  482 
  483         if (sc->as_allocated + size > sc->as_maxmem)
  484                 return 0;
  485 
  486         if (type != 0) {
  487                 printf("agp_generic_alloc_memory: unsupported type %d\n",
  488                        type);
  489                 return 0;
  490         }
  491 
  492         mem = malloc(sizeof *mem, M_AGP, M_WAITOK);
  493         mem->am_id = sc->as_nextid++;
  494         mem->am_size = size;
  495         mem->am_type = 0;
  496         mem->am_obj = vm_object_allocate(OBJT_DEFAULT, atop(round_page(size)));
  497         mem->am_physical = 0;
  498         mem->am_offset = 0;
  499         mem->am_is_bound = 0;
  500         TAILQ_INSERT_TAIL(&sc->as_memory, mem, am_link);
  501         sc->as_allocated += size;
  502 
  503         return mem;
  504 }
  505 
  506 int
  507 agp_generic_free_memory(device_t dev, struct agp_memory *mem)
  508 {
  509         struct agp_softc *sc = device_get_softc(dev);
  510 
  511         if (mem->am_is_bound)
  512                 return EBUSY;
  513 
  514         sc->as_allocated -= mem->am_size;
  515         TAILQ_REMOVE(&sc->as_memory, mem, am_link);
  516         vm_object_deallocate(mem->am_obj);
  517         free(mem, M_AGP);
  518         return 0;
  519 }
  520 
  521 int
  522 agp_generic_bind_memory(device_t dev, struct agp_memory *mem,
  523                         vm_offset_t offset)
  524 {
  525         struct agp_softc *sc = device_get_softc(dev);
  526         vm_offset_t i, j, k;
  527         vm_page_t m;
  528         int error;
  529 
  530         /* Do some sanity checks first. */
  531         if ((offset & (AGP_PAGE_SIZE - 1)) != 0 ||
  532             offset + mem->am_size > AGP_GET_APERTURE(dev)) {
  533                 device_printf(dev, "binding memory at bad offset %#x\n",
  534                     (int)offset);
  535                 return EINVAL;
  536         }
  537 
  538         /*
  539          * Allocate the pages early, before acquiring the lock,
  540          * because vm_page_grab() used with VM_ALLOC_RETRY may
  541          * block and we can't hold a mutex while blocking.
  542          */
  543         VM_OBJECT_LOCK(mem->am_obj);
  544         for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
  545                 /*
  546                  * Find a page from the object and wire it
  547                  * down. This page will be mapped using one or more
  548                  * entries in the GATT (assuming that PAGE_SIZE >=
  549                  * AGP_PAGE_SIZE. If this is the first call to bind,
  550                  * the pages will be allocated and zeroed.
  551                  */
  552                 m = vm_page_grab(mem->am_obj, OFF_TO_IDX(i),
  553                     VM_ALLOC_WIRED | VM_ALLOC_ZERO | VM_ALLOC_RETRY);
  554                 AGP_DPF("found page pa=%#jx\n", (uintmax_t)VM_PAGE_TO_PHYS(m));
  555         }
  556         VM_OBJECT_UNLOCK(mem->am_obj);
  557 
  558         mtx_lock(&sc->as_lock);
  559 
  560         if (mem->am_is_bound) {
  561                 device_printf(dev, "memory already bound\n");
  562                 error = EINVAL;
  563                 VM_OBJECT_LOCK(mem->am_obj);
  564                 i = 0;
  565                 goto bad;
  566         }
  567         
  568         /*
  569          * Bind the individual pages and flush the chipset's
  570          * TLB.
  571          */
  572         VM_OBJECT_LOCK(mem->am_obj);
  573         for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
  574                 m = vm_page_lookup(mem->am_obj, OFF_TO_IDX(i));
  575 
  576                 /*
  577                  * Install entries in the GATT, making sure that if
  578                  * AGP_PAGE_SIZE < PAGE_SIZE and mem->am_size is not
  579                  * aligned to PAGE_SIZE, we don't modify too many GATT 
  580                  * entries.
  581                  */
  582                 for (j = 0; j < PAGE_SIZE && i + j < mem->am_size;
  583                      j += AGP_PAGE_SIZE) {
  584                         vm_offset_t pa = VM_PAGE_TO_PHYS(m) + j;
  585                         AGP_DPF("binding offset %#jx to pa %#jx\n",
  586                                 (uintmax_t)offset + i + j, (uintmax_t)pa);
  587                         error = AGP_BIND_PAGE(dev, offset + i + j, pa);
  588                         if (error) {
  589                                 /*
  590                                  * Bail out. Reverse all the mappings
  591                                  * and unwire the pages.
  592                                  */
  593                                 for (k = 0; k < i + j; k += AGP_PAGE_SIZE)
  594                                         AGP_UNBIND_PAGE(dev, offset + k);
  595                                 goto bad;
  596                         }
  597                 }
  598                 vm_page_wakeup(m);
  599         }
  600         VM_OBJECT_UNLOCK(mem->am_obj);
  601 
  602         /*
  603          * Flush the cpu cache since we are providing a new mapping
  604          * for these pages.
  605          */
  606         agp_flush_cache();
  607 
  608         /*
  609          * Make sure the chipset gets the new mappings.
  610          */
  611         AGP_FLUSH_TLB(dev);
  612 
  613         mem->am_offset = offset;
  614         mem->am_is_bound = 1;
  615 
  616         mtx_unlock(&sc->as_lock);
  617 
  618         return 0;
  619 bad:
  620         mtx_unlock(&sc->as_lock);
  621         VM_OBJECT_LOCK_ASSERT(mem->am_obj, MA_OWNED);
  622         for (k = 0; k < mem->am_size; k += PAGE_SIZE) {
  623                 m = vm_page_lookup(mem->am_obj, OFF_TO_IDX(k));
  624                 if (k >= i)
  625                         vm_page_wakeup(m);
  626                 vm_page_lock_queues();
  627                 vm_page_unwire(m, 0);
  628                 vm_page_unlock_queues();
  629         }
  630         VM_OBJECT_UNLOCK(mem->am_obj);
  631 
  632         return error;
  633 }
  634 
  635 int
  636 agp_generic_unbind_memory(device_t dev, struct agp_memory *mem)
  637 {
  638         struct agp_softc *sc = device_get_softc(dev);
  639         vm_page_t m;
  640         int i;
  641 
  642         mtx_lock(&sc->as_lock);
  643 
  644         if (!mem->am_is_bound) {
  645                 device_printf(dev, "memory is not bound\n");
  646                 mtx_unlock(&sc->as_lock);
  647                 return EINVAL;
  648         }
  649 
  650 
  651         /*
  652          * Unbind the individual pages and flush the chipset's
  653          * TLB. Unwire the pages so they can be swapped.
  654          */
  655         for (i = 0; i < mem->am_size; i += AGP_PAGE_SIZE)
  656                 AGP_UNBIND_PAGE(dev, mem->am_offset + i);
  657         VM_OBJECT_LOCK(mem->am_obj);
  658         for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
  659                 m = vm_page_lookup(mem->am_obj, atop(i));
  660                 vm_page_lock_queues();
  661                 vm_page_unwire(m, 0);
  662                 vm_page_unlock_queues();
  663         }
  664         VM_OBJECT_UNLOCK(mem->am_obj);
  665                 
  666         agp_flush_cache();
  667         AGP_FLUSH_TLB(dev);
  668 
  669         mem->am_offset = 0;
  670         mem->am_is_bound = 0;
  671 
  672         mtx_unlock(&sc->as_lock);
  673 
  674         return 0;
  675 }
  676 
  677 /* Helper functions for implementing user/kernel api */
  678 
  679 static int
  680 agp_acquire_helper(device_t dev, enum agp_acquire_state state)
  681 {
  682         struct agp_softc *sc = device_get_softc(dev);
  683 
  684         if (sc->as_state != AGP_ACQUIRE_FREE)
  685                 return EBUSY;
  686         sc->as_state = state;
  687 
  688         return 0;
  689 }
  690 
  691 static int
  692 agp_release_helper(device_t dev, enum agp_acquire_state state)
  693 {
  694         struct agp_softc *sc = device_get_softc(dev);
  695 
  696         if (sc->as_state == AGP_ACQUIRE_FREE)
  697                 return 0;
  698 
  699         if (sc->as_state != state)
  700                 return EBUSY;
  701 
  702         sc->as_state = AGP_ACQUIRE_FREE;
  703         return 0;
  704 }
  705 
  706 static struct agp_memory *
  707 agp_find_memory(device_t dev, int id)
  708 {
  709         struct agp_softc *sc = device_get_softc(dev);
  710         struct agp_memory *mem;
  711 
  712         AGP_DPF("searching for memory block %d\n", id);
  713         TAILQ_FOREACH(mem, &sc->as_memory, am_link) {
  714                 AGP_DPF("considering memory block %d\n", mem->am_id);
  715                 if (mem->am_id == id)
  716                         return mem;
  717         }
  718         return 0;
  719 }
  720 
  721 /* Implementation of the userland ioctl api */
  722 
  723 static int
  724 agp_info_user(device_t dev, agp_info *info)
  725 {
  726         struct agp_softc *sc = device_get_softc(dev);
  727 
  728         bzero(info, sizeof *info);
  729         info->bridge_id = pci_get_devid(dev);
  730         info->agp_mode = 
  731             pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  732         info->aper_base = rman_get_start(sc->as_aperture);
  733         info->aper_size = AGP_GET_APERTURE(dev) >> 20;
  734         info->pg_total = info->pg_system = sc->as_maxmem >> AGP_PAGE_SHIFT;
  735         info->pg_used = sc->as_allocated >> AGP_PAGE_SHIFT;
  736 
  737         return 0;
  738 }
  739 
  740 static int
  741 agp_setup_user(device_t dev, agp_setup *setup)
  742 {
  743         return AGP_ENABLE(dev, setup->agp_mode);
  744 }
  745 
  746 static int
  747 agp_allocate_user(device_t dev, agp_allocate *alloc)
  748 {
  749         struct agp_memory *mem;
  750 
  751         mem = AGP_ALLOC_MEMORY(dev,
  752                                alloc->type,
  753                                alloc->pg_count << AGP_PAGE_SHIFT);
  754         if (mem) {
  755                 alloc->key = mem->am_id;
  756                 alloc->physical = mem->am_physical;
  757                 return 0;
  758         } else {
  759                 return ENOMEM;
  760         }
  761 }
  762 
  763 static int
  764 agp_deallocate_user(device_t dev, int id)
  765 {
  766         struct agp_memory *mem = agp_find_memory(dev, id);;
  767 
  768         if (mem) {
  769                 AGP_FREE_MEMORY(dev, mem);
  770                 return 0;
  771         } else {
  772                 return ENOENT;
  773         }
  774 }
  775 
  776 static int
  777 agp_bind_user(device_t dev, agp_bind *bind)
  778 {
  779         struct agp_memory *mem = agp_find_memory(dev, bind->key);
  780 
  781         if (!mem)
  782                 return ENOENT;
  783 
  784         return AGP_BIND_MEMORY(dev, mem, bind->pg_start << AGP_PAGE_SHIFT);
  785 }
  786 
  787 static int
  788 agp_unbind_user(device_t dev, agp_unbind *unbind)
  789 {
  790         struct agp_memory *mem = agp_find_memory(dev, unbind->key);
  791 
  792         if (!mem)
  793                 return ENOENT;
  794 
  795         return AGP_UNBIND_MEMORY(dev, mem);
  796 }
  797 
  798 static int
  799 agp_open(struct cdev *kdev, int oflags, int devtype, struct thread *td)
  800 {
  801         device_t dev = kdev->si_drv1;
  802         struct agp_softc *sc = device_get_softc(dev);
  803 
  804         if (!sc->as_isopen) {
  805                 sc->as_isopen = 1;
  806                 device_busy(dev);
  807         }
  808 
  809         return 0;
  810 }
  811 
  812 static int
  813 agp_close(struct cdev *kdev, int fflag, int devtype, struct thread *td)
  814 {
  815         device_t dev = kdev->si_drv1;
  816         struct agp_softc *sc = device_get_softc(dev);
  817         struct agp_memory *mem;
  818 
  819         /*
  820          * Clear the GATT and force release on last close
  821          */
  822         while ((mem = TAILQ_FIRST(&sc->as_memory)) != 0) {
  823                 if (mem->am_is_bound)
  824                         AGP_UNBIND_MEMORY(dev, mem);
  825                 AGP_FREE_MEMORY(dev, mem);
  826         }
  827         if (sc->as_state == AGP_ACQUIRE_USER)
  828                 agp_release_helper(dev, AGP_ACQUIRE_USER);
  829         sc->as_isopen = 0;
  830         device_unbusy(dev);
  831 
  832         return 0;
  833 }
  834 
  835 static int
  836 agp_ioctl(struct cdev *kdev, u_long cmd, caddr_t data, int fflag, struct thread *td)
  837 {
  838         device_t dev = kdev->si_drv1;
  839 
  840         switch (cmd) {
  841         case AGPIOC_INFO:
  842                 return agp_info_user(dev, (agp_info *) data);
  843 
  844         case AGPIOC_ACQUIRE:
  845                 return agp_acquire_helper(dev, AGP_ACQUIRE_USER);
  846 
  847         case AGPIOC_RELEASE:
  848                 return agp_release_helper(dev, AGP_ACQUIRE_USER);
  849 
  850         case AGPIOC_SETUP:
  851                 return agp_setup_user(dev, (agp_setup *)data);
  852 
  853         case AGPIOC_ALLOCATE:
  854                 return agp_allocate_user(dev, (agp_allocate *)data);
  855 
  856         case AGPIOC_DEALLOCATE:
  857                 return agp_deallocate_user(dev, *(int *) data);
  858 
  859         case AGPIOC_BIND:
  860                 return agp_bind_user(dev, (agp_bind *)data);
  861 
  862         case AGPIOC_UNBIND:
  863                 return agp_unbind_user(dev, (agp_unbind *)data);
  864 
  865         }
  866 
  867         return EINVAL;
  868 }
  869 
  870 static int
  871 agp_mmap(struct cdev *kdev, vm_offset_t offset, vm_paddr_t *paddr, int prot)
  872 {
  873         device_t dev = kdev->si_drv1;
  874         struct agp_softc *sc = device_get_softc(dev);
  875 
  876         if (offset > AGP_GET_APERTURE(dev))
  877                 return -1;
  878         *paddr = rman_get_start(sc->as_aperture) + offset;
  879         return 0;
  880 }
  881 
  882 /* Implementation of the kernel api */
  883 
  884 device_t
  885 agp_find_device()
  886 {
  887         device_t *children, child;
  888         int i, count;
  889 
  890         if (!agp_devclass)
  891                 return NULL;
  892         if (devclass_get_devices(agp_devclass, &children, &count) != 0)
  893                 return NULL;
  894         child = NULL;
  895         for (i = 0; i < count; i++) {
  896                 if (device_is_attached(children[i])) {
  897                         child = children[i];
  898                         break;
  899                 }
  900         }
  901         free(children, M_TEMP);
  902         return child;
  903 }
  904 
  905 enum agp_acquire_state
  906 agp_state(device_t dev)
  907 {
  908         struct agp_softc *sc = device_get_softc(dev);
  909         return sc->as_state;
  910 }
  911 
  912 void
  913 agp_get_info(device_t dev, struct agp_info *info)
  914 {
  915         struct agp_softc *sc = device_get_softc(dev);
  916 
  917         info->ai_mode =
  918                 pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  919         info->ai_aperture_base = rman_get_start(sc->as_aperture);
  920         info->ai_aperture_size = rman_get_size(sc->as_aperture);
  921         info->ai_memory_allowed = sc->as_maxmem;
  922         info->ai_memory_used = sc->as_allocated;
  923 }
  924 
  925 int
  926 agp_acquire(device_t dev)
  927 {
  928         return agp_acquire_helper(dev, AGP_ACQUIRE_KERNEL);
  929 }
  930 
  931 int
  932 agp_release(device_t dev)
  933 {
  934         return agp_release_helper(dev, AGP_ACQUIRE_KERNEL);
  935 }
  936 
  937 int
  938 agp_enable(device_t dev, u_int32_t mode)
  939 {
  940         return AGP_ENABLE(dev, mode);
  941 }
  942 
  943 void *agp_alloc_memory(device_t dev, int type, vm_size_t bytes)
  944 {
  945         return  (void *) AGP_ALLOC_MEMORY(dev, type, bytes);
  946 }
  947 
  948 void agp_free_memory(device_t dev, void *handle)
  949 {
  950         struct agp_memory *mem = (struct agp_memory *) handle;
  951         AGP_FREE_MEMORY(dev, mem);
  952 }
  953 
  954 int agp_bind_memory(device_t dev, void *handle, vm_offset_t offset)
  955 {
  956         struct agp_memory *mem = (struct agp_memory *) handle;
  957         return AGP_BIND_MEMORY(dev, mem, offset);
  958 }
  959 
  960 int agp_unbind_memory(device_t dev, void *handle)
  961 {
  962         struct agp_memory *mem = (struct agp_memory *) handle;
  963         return AGP_UNBIND_MEMORY(dev, mem);
  964 }
  965 
  966 void agp_memory_info(device_t dev, void *handle, struct
  967                      agp_memory_info *mi)
  968 {
  969         struct agp_memory *mem = (struct agp_memory *) handle;
  970 
  971         mi->ami_size = mem->am_size;
  972         mi->ami_physical = mem->am_physical;
  973         mi->ami_offset = mem->am_offset;
  974         mi->ami_is_bound = mem->am_is_bound;
  975 }

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