The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/pci/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  *      $FreeBSD: releng/5.1/sys/pci/agp.c 112569 2003-03-25 00:07:06Z jake $
   27  */
   28 
   29 #include "opt_bus.h"
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/malloc.h>
   34 #include <sys/kernel.h>
   35 #include <sys/bus.h>
   36 #include <sys/conf.h>
   37 #include <sys/ioccom.h>
   38 #include <sys/agpio.h>
   39 #include <sys/lock.h>
   40 #include <sys/lockmgr.h>
   41 #include <sys/mutex.h>
   42 #include <sys/proc.h>
   43 
   44 #include <pci/pcivar.h>
   45 #include <pci/pcireg.h>
   46 #include <pci/agppriv.h>
   47 #include <pci/agpvar.h>
   48 #include <pci/agpreg.h>
   49 
   50 #include <vm/vm.h>
   51 #include <vm/vm_object.h>
   52 #include <vm/vm_page.h>
   53 #include <vm/vm_pageout.h>
   54 #include <vm/pmap.h>
   55 
   56 #include <machine/md_var.h>
   57 #include <machine/bus.h>
   58 #include <machine/resource.h>
   59 #include <sys/rman.h>
   60 
   61 MODULE_VERSION(agp, 1);
   62 
   63 MALLOC_DEFINE(M_AGP, "agp", "AGP data structures");
   64 
   65 #define CDEV_MAJOR      148
   66                                 /* agp_drv.c */
   67 static d_open_t agp_open;
   68 static d_close_t agp_close;
   69 static d_ioctl_t agp_ioctl;
   70 static d_mmap_t agp_mmap;
   71 
   72 static struct cdevsw agp_cdevsw = {
   73         .d_open =       agp_open,
   74         .d_close =      agp_close,
   75         .d_ioctl =      agp_ioctl,
   76         .d_mmap =       agp_mmap,
   77         .d_name =       "agp",
   78         .d_maj =        CDEV_MAJOR,
   79         .d_flags =      D_TTY,
   80 };
   81 
   82 static devclass_t agp_devclass;
   83 #define KDEV2DEV(kdev)  devclass_get_device(agp_devclass, minor(kdev))
   84 
   85 /* Helper functions for implementing chipset mini drivers. */
   86 
   87 void
   88 agp_flush_cache()
   89 {
   90 #ifdef __i386__
   91         wbinvd();
   92 #endif
   93 #ifdef __alpha__
   94         /* FIXME: This is most likely not correct as it doesn't flush CPU 
   95          * write caches, but we don't have a facility to do that and 
   96          * this is all linux does, too */
   97         alpha_mb();
   98 #endif
   99 }
  100 
  101 u_int8_t
  102 agp_find_caps(device_t dev)
  103 {
  104         u_int32_t status;
  105         u_int8_t ptr, next;
  106 
  107         /*
  108          * Check the CAP_LIST bit of the PCI status register first.
  109          */
  110         status = pci_read_config(dev, PCIR_STATUS, 2);
  111         if (!(status & 0x10))
  112                 return 0;
  113 
  114         /*
  115          * Traverse the capabilities list.
  116          */
  117         for (ptr = pci_read_config(dev, AGP_CAPPTR, 1);
  118              ptr != 0;
  119              ptr = next) {
  120                 u_int32_t capid = pci_read_config(dev, ptr, 4);
  121                 next = AGP_CAPID_GET_NEXT_PTR(capid);
  122 
  123                 /*
  124                  * If this capability entry ID is 2, then we are done.
  125                  */
  126                 if (AGP_CAPID_GET_CAP_ID(capid) == 2)
  127                         return ptr;
  128         }
  129 
  130         return 0;
  131 }
  132 
  133 /*
  134  * Find an AGP display device (if any).
  135  */
  136 static device_t
  137 agp_find_display(void)
  138 {
  139         devclass_t pci = devclass_find("pci");
  140         device_t bus, dev = 0;
  141         device_t *kids;
  142         int busnum, numkids, i;
  143 
  144         for (busnum = 0; busnum < devclass_get_maxunit(pci); busnum++) {
  145                 bus = devclass_get_device(pci, busnum);
  146                 if (!bus)
  147                         continue;
  148                 device_get_children(bus, &kids, &numkids);
  149                 for (i = 0; i < numkids; i++) {
  150                         dev = kids[i];
  151                         if (pci_get_class(dev) == PCIC_DISPLAY
  152                             && pci_get_subclass(dev) == PCIS_DISPLAY_VGA)
  153                                 if (agp_find_caps(dev)) {
  154                                         free(kids, M_TEMP);
  155                                         return dev;
  156                                 }
  157                                         
  158                 }
  159                 free(kids, M_TEMP);
  160         }
  161 
  162         return 0;
  163 }
  164 
  165 struct agp_gatt *
  166 agp_alloc_gatt(device_t dev)
  167 {
  168         u_int32_t apsize = AGP_GET_APERTURE(dev);
  169         u_int32_t entries = apsize >> AGP_PAGE_SHIFT;
  170         struct agp_gatt *gatt;
  171 
  172         if (bootverbose)
  173                 device_printf(dev,
  174                               "allocating GATT for aperture of size %dM\n",
  175                               apsize / (1024*1024));
  176 
  177         gatt = malloc(sizeof(struct agp_gatt), M_AGP, M_NOWAIT);
  178         if (!gatt)
  179                 return 0;
  180 
  181         gatt->ag_entries = entries;
  182         gatt->ag_virtual = contigmalloc(entries * sizeof(u_int32_t), M_AGP, 0,
  183                                         0, ~0, PAGE_SIZE, 0);
  184         if (!gatt->ag_virtual) {
  185                 if (bootverbose)
  186                         device_printf(dev, "contiguous allocation failed\n");
  187                 free(gatt, M_AGP);
  188                 return 0;
  189         }
  190         bzero(gatt->ag_virtual, entries * sizeof(u_int32_t));
  191         gatt->ag_physical = vtophys((vm_offset_t) gatt->ag_virtual);
  192         agp_flush_cache();
  193 
  194         return gatt;
  195 }
  196 
  197 void
  198 agp_free_gatt(struct agp_gatt *gatt)
  199 {
  200         contigfree(gatt->ag_virtual,
  201                    gatt->ag_entries * sizeof(u_int32_t), M_AGP);
  202         free(gatt, M_AGP);
  203 }
  204 
  205 static int agp_max[][2] = {
  206         {0,     0},
  207         {32,    4},
  208         {64,    28},
  209         {128,   96},
  210         {256,   204},
  211         {512,   440},
  212         {1024,  942},
  213         {2048,  1920},
  214         {4096,  3932}
  215 };
  216 #define agp_max_size    (sizeof(agp_max) / sizeof(agp_max[0]))
  217 
  218 int
  219 agp_generic_attach(device_t dev)
  220 {
  221         struct agp_softc *sc = device_get_softc(dev);
  222         int rid, memsize, i;
  223 
  224         /*
  225          * Find and map the aperture.
  226          */
  227         rid = AGP_APBASE;
  228         sc->as_aperture = bus_alloc_resource(dev, SYS_RES_MEMORY, &rid,
  229                                              0, ~0, 1, RF_ACTIVE);
  230         if (!sc->as_aperture)
  231                 return ENOMEM;
  232 
  233         /*
  234          * Work out an upper bound for agp memory allocation. This
  235          * uses a heurisitc table from the Linux driver.
  236          */
  237         memsize = ptoa(Maxmem) >> 20;
  238         for (i = 0; i < agp_max_size; i++) {
  239                 if (memsize <= agp_max[i][0])
  240                         break;
  241         }
  242         if (i == agp_max_size) i = agp_max_size - 1;
  243         sc->as_maxmem = agp_max[i][1] << 20U;
  244 
  245         /*
  246          * The lock is used to prevent re-entry to
  247          * agp_generic_bind_memory() since that function can sleep.
  248          */
  249         lockinit(&sc->as_lock, PZERO|PCATCH, "agplk", 0, 0);
  250 
  251         /*
  252          * Initialise stuff for the userland device.
  253          */
  254         agp_devclass = devclass_find("agp");
  255         TAILQ_INIT(&sc->as_memory);
  256         sc->as_nextid = 1;
  257 
  258         sc->as_devnode = make_dev(&agp_cdevsw,
  259                                   device_get_unit(dev),
  260                                   UID_ROOT,
  261                                   GID_WHEEL,
  262                                   0600,
  263                                   "agpgart");
  264 
  265         return 0;
  266 }
  267 
  268 int
  269 agp_generic_detach(device_t dev)
  270 {
  271         struct agp_softc *sc = device_get_softc(dev);
  272         bus_release_resource(dev, SYS_RES_MEMORY, AGP_APBASE, sc->as_aperture);
  273         lockmgr(&sc->as_lock, LK_DRAIN, 0, curthread);
  274         lockdestroy(&sc->as_lock);
  275         destroy_dev(sc->as_devnode);
  276         agp_flush_cache();
  277         return 0;
  278 }
  279 
  280 int
  281 agp_generic_enable(device_t dev, u_int32_t mode)
  282 {
  283         device_t mdev = agp_find_display();
  284         u_int32_t tstatus, mstatus;
  285         u_int32_t command;
  286         int rq, sba, fw, rate;;
  287 
  288         if (!mdev) {
  289                 AGP_DPF("can't find display\n");
  290                 return ENXIO;
  291         }
  292 
  293         tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  294         mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
  295 
  296         /* Set RQ to the min of mode, tstatus and mstatus */
  297         rq = AGP_MODE_GET_RQ(mode);
  298         if (AGP_MODE_GET_RQ(tstatus) < rq)
  299                 rq = AGP_MODE_GET_RQ(tstatus);
  300         if (AGP_MODE_GET_RQ(mstatus) < rq)
  301                 rq = AGP_MODE_GET_RQ(mstatus);
  302 
  303         /* Set SBA if all three can deal with SBA */
  304         sba = (AGP_MODE_GET_SBA(tstatus)
  305                & AGP_MODE_GET_SBA(mstatus)
  306                & AGP_MODE_GET_SBA(mode));
  307 
  308         /* Similar for FW */
  309         fw = (AGP_MODE_GET_FW(tstatus)
  310                & AGP_MODE_GET_FW(mstatus)
  311                & AGP_MODE_GET_FW(mode));
  312 
  313         /* Figure out the max rate */
  314         rate = (AGP_MODE_GET_RATE(tstatus)
  315                 & AGP_MODE_GET_RATE(mstatus)
  316                 & AGP_MODE_GET_RATE(mode));
  317         if (rate & AGP_MODE_RATE_4x)
  318                 rate = AGP_MODE_RATE_4x;
  319         else if (rate & AGP_MODE_RATE_2x)
  320                 rate = AGP_MODE_RATE_2x;
  321         else
  322                 rate = AGP_MODE_RATE_1x;
  323 
  324         /* Construct the new mode word and tell the hardware */
  325         command = AGP_MODE_SET_RQ(0, rq);
  326         command = AGP_MODE_SET_SBA(command, sba);
  327         command = AGP_MODE_SET_FW(command, fw);
  328         command = AGP_MODE_SET_RATE(command, rate);
  329         command = AGP_MODE_SET_AGP(command, 1);
  330         pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4);
  331         pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4);
  332 
  333         return 0;
  334 }
  335 
  336 struct agp_memory *
  337 agp_generic_alloc_memory(device_t dev, int type, vm_size_t size)
  338 {
  339         struct agp_softc *sc = device_get_softc(dev);
  340         struct agp_memory *mem;
  341 
  342         if ((size & (AGP_PAGE_SIZE - 1)) != 0)
  343                 return 0;
  344 
  345         if (sc->as_allocated + size > sc->as_maxmem)
  346                 return 0;
  347 
  348         if (type != 0) {
  349                 printf("agp_generic_alloc_memory: unsupported type %d\n",
  350                        type);
  351                 return 0;
  352         }
  353 
  354         mem = malloc(sizeof *mem, M_AGP, M_WAITOK);
  355         mem->am_id = sc->as_nextid++;
  356         mem->am_size = size;
  357         mem->am_type = 0;
  358         mem->am_obj = vm_object_allocate(OBJT_DEFAULT, atop(round_page(size)));
  359         mem->am_physical = 0;
  360         mem->am_offset = 0;
  361         mem->am_is_bound = 0;
  362         TAILQ_INSERT_TAIL(&sc->as_memory, mem, am_link);
  363         sc->as_allocated += size;
  364 
  365         return mem;
  366 }
  367 
  368 int
  369 agp_generic_free_memory(device_t dev, struct agp_memory *mem)
  370 {
  371         struct agp_softc *sc = device_get_softc(dev);
  372 
  373         if (mem->am_is_bound)
  374                 return EBUSY;
  375 
  376         sc->as_allocated -= mem->am_size;
  377         TAILQ_REMOVE(&sc->as_memory, mem, am_link);
  378         vm_object_deallocate(mem->am_obj);
  379         free(mem, M_AGP);
  380         return 0;
  381 }
  382 
  383 int
  384 agp_generic_bind_memory(device_t dev, struct agp_memory *mem,
  385                         vm_offset_t offset)
  386 {
  387         struct agp_softc *sc = device_get_softc(dev);
  388         vm_offset_t i, j, k;
  389         vm_page_t m;
  390         int error;
  391 
  392         lockmgr(&sc->as_lock, LK_EXCLUSIVE, 0, curthread);
  393 
  394         if (mem->am_is_bound) {
  395                 device_printf(dev, "memory already bound\n");
  396                 return EINVAL;
  397         }
  398         
  399         if (offset < 0
  400             || (offset & (AGP_PAGE_SIZE - 1)) != 0
  401             || offset + mem->am_size > AGP_GET_APERTURE(dev)) {
  402                 device_printf(dev, "binding memory at bad offset %#x\n",
  403                               (int) offset);
  404                 return EINVAL;
  405         }
  406 
  407         /*
  408          * Bind the individual pages and flush the chipset's
  409          * TLB.
  410          *
  411          * XXX Presumably, this needs to be the pci address on alpha
  412          * (i.e. use alpha_XXX_dmamap()). I don't have access to any
  413          * alpha AGP hardware to check.
  414          */
  415         for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
  416                 /*
  417                  * Find a page from the object and wire it
  418                  * down. This page will be mapped using one or more
  419                  * entries in the GATT (assuming that PAGE_SIZE >=
  420                  * AGP_PAGE_SIZE. If this is the first call to bind,
  421                  * the pages will be allocated and zeroed.
  422                  */
  423                 m = vm_page_grab(mem->am_obj, OFF_TO_IDX(i),
  424                     VM_ALLOC_WIRED | VM_ALLOC_ZERO | VM_ALLOC_RETRY);
  425                 if ((m->flags & PG_ZERO) == 0)
  426                         pmap_zero_page(m);
  427                 AGP_DPF("found page pa=%#x\n", VM_PAGE_TO_PHYS(m));
  428 
  429                 /*
  430                  * Install entries in the GATT, making sure that if
  431                  * AGP_PAGE_SIZE < PAGE_SIZE and mem->am_size is not
  432                  * aligned to PAGE_SIZE, we don't modify too many GATT 
  433                  * entries.
  434                  */
  435                 for (j = 0; j < PAGE_SIZE && i + j < mem->am_size;
  436                      j += AGP_PAGE_SIZE) {
  437                         vm_offset_t pa = VM_PAGE_TO_PHYS(m) + j;
  438                         AGP_DPF("binding offset %#x to pa %#x\n",
  439                                 offset + i + j, pa);
  440                         error = AGP_BIND_PAGE(dev, offset + i + j, pa);
  441                         if (error) {
  442                                 /*
  443                                  * Bail out. Reverse all the mappings
  444                                  * and unwire the pages.
  445                                  */
  446                                 vm_page_lock_queues();
  447                                 vm_page_wakeup(m);
  448                                 vm_page_unlock_queues();
  449                                 for (k = 0; k < i + j; k += AGP_PAGE_SIZE)
  450                                         AGP_UNBIND_PAGE(dev, offset + k);
  451                                 for (k = 0; k <= i; k += PAGE_SIZE) {
  452                                         m = vm_page_lookup(mem->am_obj,
  453                                                            OFF_TO_IDX(k));
  454                                         vm_page_lock_queues();
  455                                         vm_page_unwire(m, 0);
  456                                         vm_page_unlock_queues();
  457                                 }
  458                                 lockmgr(&sc->as_lock, LK_RELEASE, 0, curthread);
  459                                 return error;
  460                         }
  461                 }
  462                 vm_page_lock_queues();
  463                 vm_page_wakeup(m);
  464                 vm_page_unlock_queues();
  465         }
  466 
  467         /*
  468          * Flush the cpu cache since we are providing a new mapping
  469          * for these pages.
  470          */
  471         agp_flush_cache();
  472 
  473         /*
  474          * Make sure the chipset gets the new mappings.
  475          */
  476         AGP_FLUSH_TLB(dev);
  477 
  478         mem->am_offset = offset;
  479         mem->am_is_bound = 1;
  480 
  481         lockmgr(&sc->as_lock, LK_RELEASE, 0, curthread);
  482 
  483         return 0;
  484 }
  485 
  486 int
  487 agp_generic_unbind_memory(device_t dev, struct agp_memory *mem)
  488 {
  489         struct agp_softc *sc = device_get_softc(dev);
  490         vm_page_t m;
  491         int i;
  492 
  493         lockmgr(&sc->as_lock, LK_EXCLUSIVE, 0, curthread);
  494 
  495         if (!mem->am_is_bound) {
  496                 device_printf(dev, "memory is not bound\n");
  497                 return EINVAL;
  498         }
  499 
  500 
  501         /*
  502          * Unbind the individual pages and flush the chipset's
  503          * TLB. Unwire the pages so they can be swapped.
  504          */
  505         for (i = 0; i < mem->am_size; i += AGP_PAGE_SIZE)
  506                 AGP_UNBIND_PAGE(dev, mem->am_offset + i);
  507         for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
  508                 m = vm_page_lookup(mem->am_obj, atop(i));
  509                 vm_page_lock_queues();
  510                 vm_page_unwire(m, 0);
  511                 vm_page_unlock_queues();
  512         }
  513                 
  514         agp_flush_cache();
  515         AGP_FLUSH_TLB(dev);
  516 
  517         mem->am_offset = 0;
  518         mem->am_is_bound = 0;
  519 
  520         lockmgr(&sc->as_lock, LK_RELEASE, 0, curthread);
  521 
  522         return 0;
  523 }
  524 
  525 /* Helper functions for implementing user/kernel api */
  526 
  527 static int
  528 agp_acquire_helper(device_t dev, enum agp_acquire_state state)
  529 {
  530         struct agp_softc *sc = device_get_softc(dev);
  531 
  532         if (sc->as_state != AGP_ACQUIRE_FREE)
  533                 return EBUSY;
  534         sc->as_state = state;
  535 
  536         return 0;
  537 }
  538 
  539 static int
  540 agp_release_helper(device_t dev, enum agp_acquire_state state)
  541 {
  542         struct agp_softc *sc = device_get_softc(dev);
  543 
  544         if (sc->as_state == AGP_ACQUIRE_FREE)
  545                 return 0;
  546 
  547         if (sc->as_state != state)
  548                 return EBUSY;
  549 
  550         sc->as_state = AGP_ACQUIRE_FREE;
  551         return 0;
  552 }
  553 
  554 static struct agp_memory *
  555 agp_find_memory(device_t dev, int id)
  556 {
  557         struct agp_softc *sc = device_get_softc(dev);
  558         struct agp_memory *mem;
  559 
  560         AGP_DPF("searching for memory block %d\n", id);
  561         TAILQ_FOREACH(mem, &sc->as_memory, am_link) {
  562                 AGP_DPF("considering memory block %d\n", mem->am_id);
  563                 if (mem->am_id == id)
  564                         return mem;
  565         }
  566         return 0;
  567 }
  568 
  569 /* Implementation of the userland ioctl api */
  570 
  571 static int
  572 agp_info_user(device_t dev, agp_info *info)
  573 {
  574         struct agp_softc *sc = device_get_softc(dev);
  575 
  576         bzero(info, sizeof *info);
  577         info->bridge_id = pci_get_devid(dev);
  578         info->agp_mode = 
  579             pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  580         info->aper_base = rman_get_start(sc->as_aperture);
  581         info->aper_size = AGP_GET_APERTURE(dev) >> 20;
  582         info->pg_total = info->pg_system = sc->as_maxmem >> AGP_PAGE_SHIFT;
  583         info->pg_used = sc->as_allocated >> AGP_PAGE_SHIFT;
  584 
  585         return 0;
  586 }
  587 
  588 static int
  589 agp_setup_user(device_t dev, agp_setup *setup)
  590 {
  591         return AGP_ENABLE(dev, setup->agp_mode);
  592 }
  593 
  594 static int
  595 agp_allocate_user(device_t dev, agp_allocate *alloc)
  596 {
  597         struct agp_memory *mem;
  598 
  599         mem = AGP_ALLOC_MEMORY(dev,
  600                                alloc->type,
  601                                alloc->pg_count << AGP_PAGE_SHIFT);
  602         if (mem) {
  603                 alloc->key = mem->am_id;
  604                 alloc->physical = mem->am_physical;
  605                 return 0;
  606         } else {
  607                 return ENOMEM;
  608         }
  609 }
  610 
  611 static int
  612 agp_deallocate_user(device_t dev, int id)
  613 {
  614         struct agp_memory *mem = agp_find_memory(dev, id);;
  615 
  616         if (mem) {
  617                 AGP_FREE_MEMORY(dev, mem);
  618                 return 0;
  619         } else {
  620                 return ENOENT;
  621         }
  622 }
  623 
  624 static int
  625 agp_bind_user(device_t dev, agp_bind *bind)
  626 {
  627         struct agp_memory *mem = agp_find_memory(dev, bind->key);
  628 
  629         if (!mem)
  630                 return ENOENT;
  631 
  632         return AGP_BIND_MEMORY(dev, mem, bind->pg_start << AGP_PAGE_SHIFT);
  633 }
  634 
  635 static int
  636 agp_unbind_user(device_t dev, agp_unbind *unbind)
  637 {
  638         struct agp_memory *mem = agp_find_memory(dev, unbind->key);
  639 
  640         if (!mem)
  641                 return ENOENT;
  642 
  643         return AGP_UNBIND_MEMORY(dev, mem);
  644 }
  645 
  646 static int
  647 agp_open(dev_t kdev, int oflags, int devtype, struct thread *td)
  648 {
  649         device_t dev = KDEV2DEV(kdev);
  650         struct agp_softc *sc = device_get_softc(dev);
  651 
  652         if (!sc->as_isopen) {
  653                 sc->as_isopen = 1;
  654                 device_busy(dev);
  655         }
  656 
  657         return 0;
  658 }
  659 
  660 static int
  661 agp_close(dev_t kdev, int fflag, int devtype, struct thread *td)
  662 {
  663         device_t dev = KDEV2DEV(kdev);
  664         struct agp_softc *sc = device_get_softc(dev);
  665         struct agp_memory *mem;
  666 
  667         /*
  668          * Clear the GATT and force release on last close
  669          */
  670         while ((mem = TAILQ_FIRST(&sc->as_memory)) != 0) {
  671                 if (mem->am_is_bound)
  672                         AGP_UNBIND_MEMORY(dev, mem);
  673                 AGP_FREE_MEMORY(dev, mem);
  674         }
  675         if (sc->as_state == AGP_ACQUIRE_USER)
  676                 agp_release_helper(dev, AGP_ACQUIRE_USER);
  677         sc->as_isopen = 0;
  678         device_unbusy(dev);
  679 
  680         return 0;
  681 }
  682 
  683 static int
  684 agp_ioctl(dev_t kdev, u_long cmd, caddr_t data, int fflag, struct thread *td)
  685 {
  686         device_t dev = KDEV2DEV(kdev);
  687 
  688         switch (cmd) {
  689         case AGPIOC_INFO:
  690                 return agp_info_user(dev, (agp_info *) data);
  691 
  692         case AGPIOC_ACQUIRE:
  693                 return agp_acquire_helper(dev, AGP_ACQUIRE_USER);
  694 
  695         case AGPIOC_RELEASE:
  696                 return agp_release_helper(dev, AGP_ACQUIRE_USER);
  697 
  698         case AGPIOC_SETUP:
  699                 return agp_setup_user(dev, (agp_setup *)data);
  700 
  701         case AGPIOC_ALLOCATE:
  702                 return agp_allocate_user(dev, (agp_allocate *)data);
  703 
  704         case AGPIOC_DEALLOCATE:
  705                 return agp_deallocate_user(dev, *(int *) data);
  706 
  707         case AGPIOC_BIND:
  708                 return agp_bind_user(dev, (agp_bind *)data);
  709 
  710         case AGPIOC_UNBIND:
  711                 return agp_unbind_user(dev, (agp_unbind *)data);
  712 
  713         }
  714 
  715         return EINVAL;
  716 }
  717 
  718 static int
  719 agp_mmap(dev_t kdev, vm_offset_t offset, vm_paddr_t *paddr, int prot)
  720 {
  721         device_t dev = KDEV2DEV(kdev);
  722         struct agp_softc *sc = device_get_softc(dev);
  723 
  724         if (offset > AGP_GET_APERTURE(dev))
  725                 return -1;
  726         *paddr = rman_get_start(sc->as_aperture) + offset;
  727         return 0;
  728 }
  729 
  730 /* Implementation of the kernel api */
  731 
  732 device_t
  733 agp_find_device()
  734 {
  735         if (!agp_devclass)
  736                 return 0;
  737         return devclass_get_device(agp_devclass, 0);
  738 }
  739 
  740 enum agp_acquire_state
  741 agp_state(device_t dev)
  742 {
  743         struct agp_softc *sc = device_get_softc(dev);
  744         return sc->as_state;
  745 }
  746 
  747 void
  748 agp_get_info(device_t dev, struct agp_info *info)
  749 {
  750         struct agp_softc *sc = device_get_softc(dev);
  751 
  752         info->ai_mode =
  753                 pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  754         info->ai_aperture_base = rman_get_start(sc->as_aperture);
  755         info->ai_aperture_size = rman_get_size(sc->as_aperture);
  756         info->ai_aperture_va = (vm_offset_t) rman_get_virtual(sc->as_aperture);
  757         info->ai_memory_allowed = sc->as_maxmem;
  758         info->ai_memory_used = sc->as_allocated;
  759 }
  760 
  761 int
  762 agp_acquire(device_t dev)
  763 {
  764         return agp_acquire_helper(dev, AGP_ACQUIRE_KERNEL);
  765 }
  766 
  767 int
  768 agp_release(device_t dev)
  769 {
  770         return agp_release_helper(dev, AGP_ACQUIRE_KERNEL);
  771 }
  772 
  773 int
  774 agp_enable(device_t dev, u_int32_t mode)
  775 {
  776         return AGP_ENABLE(dev, mode);
  777 }
  778 
  779 void *agp_alloc_memory(device_t dev, int type, vm_size_t bytes)
  780 {
  781         return  (void *) AGP_ALLOC_MEMORY(dev, type, bytes);
  782 }
  783 
  784 void agp_free_memory(device_t dev, void *handle)
  785 {
  786         struct agp_memory *mem = (struct agp_memory *) handle;
  787         AGP_FREE_MEMORY(dev, mem);
  788 }
  789 
  790 int agp_bind_memory(device_t dev, void *handle, vm_offset_t offset)
  791 {
  792         struct agp_memory *mem = (struct agp_memory *) handle;
  793         return AGP_BIND_MEMORY(dev, mem, offset);
  794 }
  795 
  796 int agp_unbind_memory(device_t dev, void *handle)
  797 {
  798         struct agp_memory *mem = (struct agp_memory *) handle;
  799         return AGP_UNBIND_MEMORY(dev, mem);
  800 }
  801 
  802 void agp_memory_info(device_t dev, void *handle, struct
  803                      agp_memory_info *mi)
  804 {
  805         struct agp_memory *mem = (struct agp_memory *) handle;
  806 
  807         mi->ami_size = mem->am_size;
  808         mi->ami_physical = mem->am_physical;
  809         mi->ami_offset = mem->am_offset;
  810         mi->ami_is_bound = mem->am_is_bound;
  811 }

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