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  *      $FreeBSD$
   27  */
   28 
   29 #include "opt_bus.h"
   30 #include "opt_pci.h"
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/malloc.h>
   35 #include <sys/kernel.h>
   36 #include <sys/bus.h>
   37 #include <sys/conf.h>
   38 #include <sys/ioccom.h>
   39 #include <sys/agpio.h>
   40 #include <sys/lock.h>
   41 #include <sys/proc.h>
   42 
   43 #include <pci/pcivar.h>
   44 #include <pci/pcireg.h>
   45 #include <pci/agppriv.h>
   46 #include <pci/agpvar.h>
   47 #include <pci/agpreg.h>
   48 
   49 #include <vm/vm.h>
   50 #include <vm/vm_object.h>
   51 #include <vm/vm_page.h>
   52 #include <vm/vm_pageout.h>
   53 #include <vm/pmap.h>
   54 
   55 #include <machine/md_var.h>
   56 #include <machine/bus.h>
   57 #include <machine/resource.h>
   58 #include <sys/rman.h>
   59 
   60 MODULE_VERSION(agp, 1);
   61 
   62 MALLOC_DEFINE(M_AGP, "agp", "AGP data structures");
   63 
   64 #define CDEV_MAJOR      148
   65                                 /* agp_drv.c */
   66 static d_open_t agp_open;
   67 static d_close_t agp_close;
   68 static d_ioctl_t agp_ioctl;
   69 static d_mmap_t agp_mmap;
   70 
   71 static struct cdevsw agp_cdevsw = {
   72         /* open */      agp_open,
   73         /* close */     agp_close,
   74         /* read */      noread,
   75         /* write */     nowrite,
   76         /* ioctl */     agp_ioctl,
   77         /* poll */      nopoll,
   78         /* mmap */      agp_mmap,
   79         /* strategy */  nostrategy,
   80         /* name */      "agp",
   81         /* maj */       CDEV_MAJOR,
   82         /* dump */      nodump,
   83         /* psize */     nopsize,
   84         /* flags */     D_TTY,
   85         /* bmaj */      -1
   86 };
   87 
   88 static devclass_t agp_devclass;
   89 #define KDEV2DEV(kdev)  devclass_get_device(agp_devclass, minor(kdev))
   90 
   91 /* Helper functions for implementing chipset mini drivers. */
   92 
   93 void
   94 agp_flush_cache()
   95 {
   96 #ifdef __i386__
   97         wbinvd();
   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, curproc);
  274         destroy_dev(sc->as_devnode);
  275         agp_flush_cache();
  276         return 0;
  277 }
  278 
  279 int
  280 agp_generic_enable(device_t dev, u_int32_t mode)
  281 {
  282         device_t mdev = agp_find_display();
  283         u_int32_t tstatus, mstatus;
  284         u_int32_t command;
  285         int rq, sba, fw, rate;;
  286 
  287         if (!mdev) {
  288                 AGP_DPF("can't find display\n");
  289                 return ENXIO;
  290         }
  291 
  292         tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  293         mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
  294 
  295         /* Set RQ to the min of mode, tstatus and mstatus */
  296         rq = AGP_MODE_GET_RQ(mode);
  297         if (AGP_MODE_GET_RQ(tstatus) < rq)
  298                 rq = AGP_MODE_GET_RQ(tstatus);
  299         if (AGP_MODE_GET_RQ(mstatus) < rq)
  300                 rq = AGP_MODE_GET_RQ(mstatus);
  301 
  302         /* Set SBA if all three can deal with SBA */
  303         sba = (AGP_MODE_GET_SBA(tstatus)
  304                & AGP_MODE_GET_SBA(mstatus)
  305                & AGP_MODE_GET_SBA(mode));
  306 
  307         /* Similar for FW */
  308         fw = (AGP_MODE_GET_FW(tstatus)
  309                & AGP_MODE_GET_FW(mstatus)
  310                & AGP_MODE_GET_FW(mode));
  311 
  312         /* Figure out the max rate */
  313         rate = (AGP_MODE_GET_RATE(tstatus)
  314                 & AGP_MODE_GET_RATE(mstatus)
  315                 & AGP_MODE_GET_RATE(mode));
  316         if (rate & AGP_MODE_RATE_4x)
  317                 rate = AGP_MODE_RATE_4x;
  318         else if (rate & AGP_MODE_RATE_2x)
  319                 rate = AGP_MODE_RATE_2x;
  320         else
  321                 rate = AGP_MODE_RATE_1x;
  322 
  323         /* Construct the new mode word and tell the hardware */
  324         command = AGP_MODE_SET_RQ(0, rq);
  325         command = AGP_MODE_SET_SBA(command, sba);
  326         command = AGP_MODE_SET_FW(command, fw);
  327         command = AGP_MODE_SET_RATE(command, rate);
  328         command = AGP_MODE_SET_AGP(command, 1);
  329         pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4);
  330         pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4);
  331 
  332         return 0;
  333 }
  334 
  335 struct agp_memory *
  336 agp_generic_alloc_memory(device_t dev, int type, vm_size_t size)
  337 {
  338         struct agp_softc *sc = device_get_softc(dev);
  339         struct agp_memory *mem;
  340 
  341         if ((size & (AGP_PAGE_SIZE - 1)) != 0)
  342                 return 0;
  343 
  344         if (sc->as_allocated + size > sc->as_maxmem)
  345                 return 0;
  346 
  347         if (type != 0) {
  348                 printf("agp_generic_alloc_memory: unsupported type %d\n",
  349                        type);
  350                 return 0;
  351         }
  352 
  353         mem = malloc(sizeof *mem, M_AGP, M_WAITOK);
  354         mem->am_id = sc->as_nextid++;
  355         mem->am_size = size;
  356         mem->am_type = 0;
  357         mem->am_obj = vm_object_allocate(OBJT_DEFAULT, atop(round_page(size)));
  358         mem->am_physical = 0;
  359         mem->am_offset = 0;
  360         mem->am_is_bound = 0;
  361         TAILQ_INSERT_TAIL(&sc->as_memory, mem, am_link);
  362         sc->as_allocated += size;
  363 
  364         return mem;
  365 }
  366 
  367 int
  368 agp_generic_free_memory(device_t dev, struct agp_memory *mem)
  369 {
  370         struct agp_softc *sc = device_get_softc(dev);
  371 
  372         if (mem->am_is_bound)
  373                 return EBUSY;
  374 
  375         sc->as_allocated -= mem->am_size;
  376         TAILQ_REMOVE(&sc->as_memory, mem, am_link);
  377         vm_object_deallocate(mem->am_obj);
  378         free(mem, M_AGP);
  379         return 0;
  380 }
  381 
  382 int
  383 agp_generic_bind_memory(device_t dev, struct agp_memory *mem,
  384                         vm_offset_t offset)
  385 {
  386         struct agp_softc *sc = device_get_softc(dev);
  387         vm_offset_t i, j, k;
  388         vm_page_t m;
  389         int error;
  390 
  391         lockmgr(&sc->as_lock, LK_EXCLUSIVE, 0, curproc);
  392 
  393         if (mem->am_is_bound) {
  394                 device_printf(dev, "memory already bound\n");
  395                 return EINVAL;
  396         }
  397         
  398         if (offset < 0
  399             || (offset & (AGP_PAGE_SIZE - 1)) != 0
  400             || offset + mem->am_size > AGP_GET_APERTURE(dev)) {
  401                 device_printf(dev, "binding memory at bad offset %#x\n",
  402                               (int) offset);
  403                 return EINVAL;
  404         }
  405 
  406         /*
  407          * Bind the individual pages and flush the chipset's
  408          * TLB.
  409          *
  410          * XXX Presumably, this needs to be the pci address on alpha
  411          * (i.e. use alpha_XXX_dmamap()). I don't have access to any
  412          * alpha AGP hardware to check.
  413          */
  414         for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
  415                 /*
  416                  * Find a page from the object and wire it
  417                  * down. This page will be mapped using one or more
  418                  * entries in the GATT (assuming that PAGE_SIZE >=
  419                  * AGP_PAGE_SIZE. If this is the first call to bind,
  420                  * the pages will be allocated and zeroed.
  421                  */
  422                 m = vm_page_grab(mem->am_obj, OFF_TO_IDX(i),
  423                                  VM_ALLOC_ZERO | VM_ALLOC_RETRY);
  424                 if ((m->flags & PG_ZERO) == 0)
  425                         vm_page_zero_fill(m);
  426                 AGP_DPF("found page pa=%#x\n", VM_PAGE_TO_PHYS(m));
  427                 vm_page_wire(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_wakeup(m);
  447                                 for (k = 0; k < i + j; k += AGP_PAGE_SIZE)
  448                                         AGP_UNBIND_PAGE(dev, offset + k);
  449                                 for (k = 0; k <= i; k += PAGE_SIZE) {
  450                                         m = vm_page_lookup(mem->am_obj,
  451                                                            OFF_TO_IDX(k));
  452                                         vm_page_unwire(m, 0);
  453                                 }
  454                                 lockmgr(&sc->as_lock, LK_RELEASE, 0, curproc);
  455                                 return error;
  456                         }
  457                 }
  458                 vm_page_wakeup(m);
  459         }
  460 
  461         /*
  462          * Flush the cpu cache since we are providing a new mapping
  463          * for these pages.
  464          */
  465         agp_flush_cache();
  466 
  467         /*
  468          * Make sure the chipset gets the new mappings.
  469          */
  470         AGP_FLUSH_TLB(dev);
  471 
  472         mem->am_offset = offset;
  473         mem->am_is_bound = 1;
  474 
  475         lockmgr(&sc->as_lock, LK_RELEASE, 0, curproc);
  476 
  477         return 0;
  478 }
  479 
  480 int
  481 agp_generic_unbind_memory(device_t dev, struct agp_memory *mem)
  482 {
  483         struct agp_softc *sc = device_get_softc(dev);
  484         vm_page_t m;
  485         int i;
  486 
  487         lockmgr(&sc->as_lock, LK_EXCLUSIVE, 0, curproc);
  488 
  489         if (!mem->am_is_bound) {
  490                 device_printf(dev, "memory is not bound\n");
  491                 return EINVAL;
  492         }
  493 
  494 
  495         /*
  496          * Unbind the individual pages and flush the chipset's
  497          * TLB. Unwire the pages so they can be swapped.
  498          */
  499         for (i = 0; i < mem->am_size; i += AGP_PAGE_SIZE)
  500                 AGP_UNBIND_PAGE(dev, mem->am_offset + i);
  501         for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
  502                 m = vm_page_lookup(mem->am_obj, atop(i));
  503                 vm_page_unwire(m, 0);
  504         }
  505                 
  506         agp_flush_cache();
  507         AGP_FLUSH_TLB(dev);
  508 
  509         mem->am_offset = 0;
  510         mem->am_is_bound = 0;
  511 
  512         lockmgr(&sc->as_lock, LK_RELEASE, 0, curproc);
  513 
  514         return 0;
  515 }
  516 
  517 /* Helper functions for implementing user/kernel api */
  518 
  519 static int
  520 agp_acquire_helper(device_t dev, enum agp_acquire_state state)
  521 {
  522         struct agp_softc *sc = device_get_softc(dev);
  523 
  524         if (sc->as_state != AGP_ACQUIRE_FREE)
  525                 return EBUSY;
  526         sc->as_state = state;
  527 
  528         return 0;
  529 }
  530 
  531 static int
  532 agp_release_helper(device_t dev, enum agp_acquire_state state)
  533 {
  534         struct agp_softc *sc = device_get_softc(dev);
  535 
  536         if (sc->as_state == AGP_ACQUIRE_FREE)
  537                 return 0;
  538 
  539         if (sc->as_state != state)
  540                 return EBUSY;
  541 
  542         sc->as_state = AGP_ACQUIRE_FREE;
  543         return 0;
  544 }
  545 
  546 static struct agp_memory *
  547 agp_find_memory(device_t dev, int id)
  548 {
  549         struct agp_softc *sc = device_get_softc(dev);
  550         struct agp_memory *mem;
  551 
  552         AGP_DPF("searching for memory block %d\n", id);
  553         TAILQ_FOREACH(mem, &sc->as_memory, am_link) {
  554                 AGP_DPF("considering memory block %d\n", mem->am_id);
  555                 if (mem->am_id == id)
  556                         return mem;
  557         }
  558         return 0;
  559 }
  560 
  561 /* Implementation of the userland ioctl api */
  562 
  563 static int
  564 agp_info_user(device_t dev, agp_info *info)
  565 {
  566         struct agp_softc *sc = device_get_softc(dev);
  567 
  568         bzero(info, sizeof *info);
  569         info->bridge_id = pci_get_devid(dev);
  570         info->agp_mode = 
  571             pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  572         info->aper_base = rman_get_start(sc->as_aperture);
  573         info->aper_size = AGP_GET_APERTURE(dev) >> 20;
  574         info->pg_total = info->pg_system = sc->as_maxmem >> AGP_PAGE_SHIFT;
  575         info->pg_used = sc->as_allocated >> AGP_PAGE_SHIFT;
  576 
  577         return 0;
  578 }
  579 
  580 static int
  581 agp_setup_user(device_t dev, agp_setup *setup)
  582 {
  583         return AGP_ENABLE(dev, setup->agp_mode);
  584 }
  585 
  586 static int
  587 agp_allocate_user(device_t dev, agp_allocate *alloc)
  588 {
  589         struct agp_memory *mem;
  590 
  591         mem = AGP_ALLOC_MEMORY(dev,
  592                                alloc->type,
  593                                alloc->pg_count << AGP_PAGE_SHIFT);
  594         if (mem) {
  595                 alloc->key = mem->am_id;
  596                 alloc->physical = mem->am_physical;
  597                 return 0;
  598         } else {
  599                 return ENOMEM;
  600         }
  601 }
  602 
  603 static int
  604 agp_deallocate_user(device_t dev, int id)
  605 {
  606         struct agp_memory *mem = agp_find_memory(dev, id);;
  607 
  608         if (mem) {
  609                 AGP_FREE_MEMORY(dev, mem);
  610                 return 0;
  611         } else {
  612                 return ENOENT;
  613         }
  614 }
  615 
  616 static int
  617 agp_bind_user(device_t dev, agp_bind *bind)
  618 {
  619         struct agp_memory *mem = agp_find_memory(dev, bind->key);
  620 
  621         if (!mem)
  622                 return ENOENT;
  623 
  624         return AGP_BIND_MEMORY(dev, mem, bind->pg_start << AGP_PAGE_SHIFT);
  625 }
  626 
  627 static int
  628 agp_unbind_user(device_t dev, agp_unbind *unbind)
  629 {
  630         struct agp_memory *mem = agp_find_memory(dev, unbind->key);
  631 
  632         if (!mem)
  633                 return ENOENT;
  634 
  635         return AGP_UNBIND_MEMORY(dev, mem);
  636 }
  637 
  638 static int
  639 agp_open(dev_t kdev, int oflags, int devtype, struct proc *p)
  640 {
  641         device_t dev = KDEV2DEV(kdev);
  642         struct agp_softc *sc = device_get_softc(dev);
  643 
  644         if (!sc->as_isopen) {
  645                 sc->as_isopen = 1;
  646                 device_busy(dev);
  647         }
  648 
  649         return 0;
  650 }
  651 
  652 static int
  653 agp_close(dev_t kdev, int fflag, int devtype, struct proc *p)
  654 {
  655         device_t dev = KDEV2DEV(kdev);
  656         struct agp_softc *sc = device_get_softc(dev);
  657         struct agp_memory *mem;
  658 
  659         /*
  660          * Clear the GATT and force release on last close
  661          */
  662         while ((mem = TAILQ_FIRST(&sc->as_memory)) != 0) {
  663                 if (mem->am_is_bound)
  664                         AGP_UNBIND_MEMORY(dev, mem);
  665                 AGP_FREE_MEMORY(dev, mem);
  666         }
  667         if (sc->as_state == AGP_ACQUIRE_USER)
  668                 agp_release_helper(dev, AGP_ACQUIRE_USER);
  669         sc->as_isopen = 0;
  670         device_unbusy(dev);
  671 
  672         return 0;
  673 }
  674 
  675 static int
  676 agp_ioctl(dev_t kdev, u_long cmd, caddr_t data, int fflag, struct proc *p)
  677 {
  678         device_t dev = KDEV2DEV(kdev);
  679 
  680         switch (cmd) {
  681         case AGPIOC_INFO:
  682                 return agp_info_user(dev, (agp_info *) data);
  683 
  684         case AGPIOC_ACQUIRE:
  685                 return agp_acquire_helper(dev, AGP_ACQUIRE_USER);
  686 
  687         case AGPIOC_RELEASE:
  688                 return agp_release_helper(dev, AGP_ACQUIRE_USER);
  689 
  690         case AGPIOC_SETUP:
  691                 return agp_setup_user(dev, (agp_setup *)data);
  692 
  693         case AGPIOC_ALLOCATE:
  694                 return agp_allocate_user(dev, (agp_allocate *)data);
  695 
  696         case AGPIOC_DEALLOCATE:
  697                 return agp_deallocate_user(dev, *(int *) data);
  698 
  699         case AGPIOC_BIND:
  700                 return agp_bind_user(dev, (agp_bind *)data);
  701 
  702         case AGPIOC_UNBIND:
  703                 return agp_unbind_user(dev, (agp_unbind *)data);
  704 
  705         }
  706 
  707         return EINVAL;
  708 }
  709 
  710 static int
  711 agp_mmap(dev_t kdev, vm_offset_t offset, int prot)
  712 {
  713         device_t dev = KDEV2DEV(kdev);
  714         struct agp_softc *sc = device_get_softc(dev);
  715 
  716         if (offset > AGP_GET_APERTURE(dev))
  717                 return -1;
  718         return atop(rman_get_start(sc->as_aperture) + offset);
  719 }
  720 
  721 /* Implementation of the kernel api */
  722 
  723 device_t
  724 agp_find_device()
  725 {
  726         if (!agp_devclass)
  727                 return 0;
  728         return devclass_get_device(agp_devclass, 0);
  729 }
  730 
  731 enum agp_acquire_state
  732 agp_state(device_t dev)
  733 {
  734         struct agp_softc *sc = device_get_softc(dev);
  735         return sc->as_state;
  736 }
  737 
  738 void
  739 agp_get_info(device_t dev, struct agp_info *info)
  740 {
  741         struct agp_softc *sc = device_get_softc(dev);
  742 
  743         info->ai_mode =
  744                 pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  745         info->ai_aperture_base = rman_get_start(sc->as_aperture);
  746         info->ai_aperture_size = (rman_get_end(sc->as_aperture)
  747                                   - rman_get_start(sc->as_aperture)) + 1;
  748         info->ai_aperture_va = (vm_offset_t) rman_get_virtual(sc->as_aperture);
  749         info->ai_memory_allowed = sc->as_maxmem;
  750         info->ai_memory_used = sc->as_allocated;
  751 }
  752 
  753 int
  754 agp_acquire(device_t dev)
  755 {
  756         return agp_acquire_helper(dev, AGP_ACQUIRE_KERNEL);
  757 }
  758 
  759 int
  760 agp_release(device_t dev)
  761 {
  762         return agp_release_helper(dev, AGP_ACQUIRE_KERNEL);
  763 }
  764 
  765 int
  766 agp_enable(device_t dev, u_int32_t mode)
  767 {
  768         return AGP_ENABLE(dev, mode);
  769 }
  770 
  771 void *agp_alloc_memory(device_t dev, int type, vm_size_t bytes)
  772 {
  773         return  (void *) AGP_ALLOC_MEMORY(dev, type, bytes);
  774 }
  775 
  776 void agp_free_memory(device_t dev, void *handle)
  777 {
  778         struct agp_memory *mem = (struct agp_memory *) handle;
  779         AGP_FREE_MEMORY(dev, mem);
  780 }
  781 
  782 int agp_bind_memory(device_t dev, void *handle, vm_offset_t offset)
  783 {
  784         struct agp_memory *mem = (struct agp_memory *) handle;
  785         return AGP_BIND_MEMORY(dev, mem, offset);
  786 }
  787 
  788 int agp_unbind_memory(device_t dev, void *handle)
  789 {
  790         struct agp_memory *mem = (struct agp_memory *) handle;
  791         return AGP_UNBIND_MEMORY(dev, mem);
  792 }
  793 
  794 void agp_memory_info(device_t dev, void *handle, struct
  795                      agp_memory_info *mi)
  796 {
  797         struct agp_memory *mem = (struct agp_memory *) handle;
  798 
  799         mi->ami_size = mem->am_size;
  800         mi->ami_physical = mem->am_physical;
  801         mi->ami_offset = mem->am_offset;
  802         mi->ami_is_bound = mem->am_is_bound;
  803 }
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FreeBSD/Linux Kernel Cross Reference sys/pci/agp.c

FreeBSD/Linux Kernel Cross Reference
sys/pci/agp.c
