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("$FreeBSD$");
   29 
   30 #include "opt_bus.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/module.h>
   37 #include <sys/bus.h>
   38 #include <sys/conf.h>
   39 #include <sys/ioccom.h>
   40 #include <sys/agpio.h>
   41 #include <sys/lock.h>
   42 #include <sys/mutex.h>
   43 #include <sys/proc.h>
   44 
   45 #include <dev/pci/pcivar.h>
   46 #include <dev/pci/pcireg.h>
   47 #include <pci/agppriv.h>
   48 #include <pci/agpvar.h>
   49 #include <pci/agpreg.h>
   50 
   51 #include <vm/vm.h>
   52 #include <vm/vm_object.h>
   53 #include <vm/vm_page.h>
   54 #include <vm/vm_pageout.h>
   55 #include <vm/pmap.h>
   56 
   57 #include <machine/md_var.h>
   58 #include <machine/bus.h>
   59 #include <machine/resource.h>
   60 #include <sys/rman.h>
   61 
   62 MODULE_VERSION(agp, 1);
   63 
   64 MALLOC_DEFINE(M_AGP, "agp", "AGP data structures");
   65 
   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_version =    D_VERSION,
   74         .d_flags =      D_NEEDGIANT,
   75         .d_open =       agp_open,
   76         .d_close =      agp_close,
   77         .d_ioctl =      agp_ioctl,
   78         .d_mmap =       agp_mmap,
   79         .d_name =       "agp",
   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 #if defined(__i386__) || defined(__amd64__)
   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         int capreg;
  105 
  106 
  107         if (pci_find_extcap(dev, PCIY_AGP, &capreg) != 0)
  108                 capreg = 0;
  109         return (capreg);
  110 }
  111 
  112 /*
  113  * Find an AGP display device (if any).
  114  */
  115 static device_t
  116 agp_find_display(void)
  117 {
  118         devclass_t pci = devclass_find("pci");
  119         device_t bus, dev = 0;
  120         device_t *kids;
  121         int busnum, numkids, i;
  122 
  123         for (busnum = 0; busnum < devclass_get_maxunit(pci); busnum++) {
  124                 bus = devclass_get_device(pci, busnum);
  125                 if (!bus)
  126                         continue;
  127                 device_get_children(bus, &kids, &numkids);
  128                 for (i = 0; i < numkids; i++) {
  129                         dev = kids[i];
  130                         if (pci_get_class(dev) == PCIC_DISPLAY
  131                             && pci_get_subclass(dev) == PCIS_DISPLAY_VGA)
  132                                 if (agp_find_caps(dev)) {
  133                                         free(kids, M_TEMP);
  134                                         return dev;
  135                                 }
  136                                         
  137                 }
  138                 free(kids, M_TEMP);
  139         }
  140 
  141         return 0;
  142 }
  143 
  144 struct agp_gatt *
  145 agp_alloc_gatt(device_t dev)
  146 {
  147         u_int32_t apsize = AGP_GET_APERTURE(dev);
  148         u_int32_t entries = apsize >> AGP_PAGE_SHIFT;
  149         struct agp_gatt *gatt;
  150 
  151         if (bootverbose)
  152                 device_printf(dev,
  153                               "allocating GATT for aperture of size %dM\n",
  154                               apsize / (1024*1024));
  155 
  156         if (entries == 0) {
  157                 device_printf(dev, "bad aperture size\n");
  158                 return NULL;
  159         }
  160 
  161         gatt = malloc(sizeof(struct agp_gatt), M_AGP, M_NOWAIT);
  162         if (!gatt)
  163                 return 0;
  164 
  165         gatt->ag_entries = entries;
  166         gatt->ag_virtual = contigmalloc(entries * sizeof(u_int32_t), M_AGP, 0,
  167                                         0, ~0, PAGE_SIZE, 0);
  168         if (!gatt->ag_virtual) {
  169                 if (bootverbose)
  170                         device_printf(dev, "contiguous allocation failed\n");
  171                 free(gatt, M_AGP);
  172                 return 0;
  173         }
  174         bzero(gatt->ag_virtual, entries * sizeof(u_int32_t));
  175         gatt->ag_physical = vtophys((vm_offset_t) gatt->ag_virtual);
  176         agp_flush_cache();
  177 
  178         return gatt;
  179 }
  180 
  181 void
  182 agp_free_gatt(struct agp_gatt *gatt)
  183 {
  184         contigfree(gatt->ag_virtual,
  185                    gatt->ag_entries * sizeof(u_int32_t), M_AGP);
  186         free(gatt, M_AGP);
  187 }
  188 
  189 static int agp_max[][2] = {
  190         {0,     0},
  191         {32,    4},
  192         {64,    28},
  193         {128,   96},
  194         {256,   204},
  195         {512,   440},
  196         {1024,  942},
  197         {2048,  1920},
  198         {4096,  3932}
  199 };
  200 #define agp_max_size    (sizeof(agp_max) / sizeof(agp_max[0]))
  201 
  202 int
  203 agp_generic_attach(device_t dev)
  204 {
  205         struct agp_softc *sc = device_get_softc(dev);
  206         int rid, memsize, i;
  207 
  208         /*
  209          * Find and map the aperture.
  210          */
  211         rid = AGP_APBASE;
  212         sc->as_aperture = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
  213                                                  RF_ACTIVE);
  214         if (!sc->as_aperture)
  215                 return ENOMEM;
  216 
  217         /*
  218          * Work out an upper bound for agp memory allocation. This
  219          * uses a heurisitc table from the Linux driver.
  220          */
  221         memsize = ptoa(Maxmem) >> 20;
  222         for (i = 0; i < agp_max_size; i++) {
  223                 if (memsize <= agp_max[i][0])
  224                         break;
  225         }
  226         if (i == agp_max_size) i = agp_max_size - 1;
  227         sc->as_maxmem = agp_max[i][1] << 20U;
  228 
  229         /*
  230          * The lock is used to prevent re-entry to
  231          * agp_generic_bind_memory() since that function can sleep.
  232          */
  233         mtx_init(&sc->as_lock, "agp lock", NULL, MTX_DEF);
  234 
  235         /*
  236          * Initialise stuff for the userland device.
  237          */
  238         agp_devclass = devclass_find("agp");
  239         TAILQ_INIT(&sc->as_memory);
  240         sc->as_nextid = 1;
  241 
  242         sc->as_devnode = make_dev(&agp_cdevsw,
  243                                   device_get_unit(dev),
  244                                   UID_ROOT,
  245                                   GID_WHEEL,
  246                                   0600,
  247                                   "agpgart");
  248 
  249         return 0;
  250 }
  251 
  252 void
  253 agp_free_cdev(device_t dev)
  254 {
  255         struct agp_softc *sc = device_get_softc(dev);
  256 
  257         destroy_dev(sc->as_devnode);
  258 }
  259 
  260 void
  261 agp_free_res(device_t dev)
  262 {
  263         struct agp_softc *sc = device_get_softc(dev);
  264 
  265         bus_release_resource(dev, SYS_RES_MEMORY, AGP_APBASE, sc->as_aperture);
  266         mtx_destroy(&sc->as_lock);
  267         agp_flush_cache();
  268 }
  269 
  270 int
  271 agp_generic_detach(device_t dev)
  272 {
  273 
  274         agp_free_cdev(dev);
  275         agp_free_res(dev);
  276         return 0;
  277 }
  278 
  279 /*
  280  * This does the enable logic for v3, with the same topology
  281  * restrictions as in place for v2 -- one bus, one device on the bus.
  282  */
  283 static int
  284 agp_v3_enable(device_t dev, device_t mdev, u_int32_t mode)
  285 {
  286         u_int32_t tstatus, mstatus;
  287         u_int32_t command;
  288         int rq, sba, fw, rate, arqsz, cal;
  289 
  290         tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  291         mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
  292 
  293         /* Set RQ to the min of mode, tstatus and mstatus */
  294         rq = AGP_MODE_GET_RQ(mode);
  295         if (AGP_MODE_GET_RQ(tstatus) < rq)
  296                 rq = AGP_MODE_GET_RQ(tstatus);
  297         if (AGP_MODE_GET_RQ(mstatus) < rq)
  298                 rq = AGP_MODE_GET_RQ(mstatus);
  299 
  300         /*
  301          * ARQSZ - Set the value to the maximum one.
  302          * Don't allow the mode register to override values.
  303          */
  304         arqsz = AGP_MODE_GET_ARQSZ(mode);
  305         if (AGP_MODE_GET_ARQSZ(tstatus) > rq)
  306                 rq = AGP_MODE_GET_ARQSZ(tstatus);
  307         if (AGP_MODE_GET_ARQSZ(mstatus) > rq)
  308                 rq = AGP_MODE_GET_ARQSZ(mstatus);
  309 
  310         /* Calibration cycle - don't allow override by mode register */
  311         cal = AGP_MODE_GET_CAL(tstatus);
  312         if (AGP_MODE_GET_CAL(mstatus) < cal)
  313                 cal = AGP_MODE_GET_CAL(mstatus);
  314 
  315         /* SBA must be supported for AGP v3. */
  316         sba = 1;
  317 
  318         /* Set FW if all three support it. */
  319         fw = (AGP_MODE_GET_FW(tstatus)
  320                & AGP_MODE_GET_FW(mstatus)
  321                & AGP_MODE_GET_FW(mode));
  322         
  323         /* Figure out the max rate */
  324         rate = (AGP_MODE_GET_RATE(tstatus)
  325                 & AGP_MODE_GET_RATE(mstatus)
  326                 & AGP_MODE_GET_RATE(mode));
  327         if (rate & AGP_MODE_V3_RATE_8x)
  328                 rate = AGP_MODE_V3_RATE_8x;
  329         else
  330                 rate = AGP_MODE_V3_RATE_4x;
  331         if (bootverbose)
  332                 device_printf(dev, "Setting AGP v3 mode %d\n", rate * 4);
  333 
  334         pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, 0, 4);
  335 
  336         /* Construct the new mode word and tell the hardware */
  337         command = AGP_MODE_SET_RQ(0, rq);
  338         command = AGP_MODE_SET_ARQSZ(command, arqsz);
  339         command = AGP_MODE_SET_CAL(command, cal);
  340         command = AGP_MODE_SET_SBA(command, sba);
  341         command = AGP_MODE_SET_FW(command, fw);
  342         command = AGP_MODE_SET_RATE(command, rate);
  343         command = AGP_MODE_SET_AGP(command, 1);
  344         pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4);
  345         pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4);
  346 
  347         return 0;
  348 }
  349 
  350 static int
  351 agp_v2_enable(device_t dev, device_t mdev, u_int32_t mode)
  352 {
  353         u_int32_t tstatus, mstatus;
  354         u_int32_t command;
  355         int rq, sba, fw, rate;
  356 
  357         tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  358         mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
  359 
  360         /* Set RQ to the min of mode, tstatus and mstatus */
  361         rq = AGP_MODE_GET_RQ(mode);
  362         if (AGP_MODE_GET_RQ(tstatus) < rq)
  363                 rq = AGP_MODE_GET_RQ(tstatus);
  364         if (AGP_MODE_GET_RQ(mstatus) < rq)
  365                 rq = AGP_MODE_GET_RQ(mstatus);
  366 
  367         /* Set SBA if all three can deal with SBA */
  368         sba = (AGP_MODE_GET_SBA(tstatus)
  369                & AGP_MODE_GET_SBA(mstatus)
  370                & AGP_MODE_GET_SBA(mode));
  371 
  372         /* Similar for FW */
  373         fw = (AGP_MODE_GET_FW(tstatus)
  374                & AGP_MODE_GET_FW(mstatus)
  375                & AGP_MODE_GET_FW(mode));
  376 
  377         /* Figure out the max rate */
  378         rate = (AGP_MODE_GET_RATE(tstatus)
  379                 & AGP_MODE_GET_RATE(mstatus)
  380                 & AGP_MODE_GET_RATE(mode));
  381         if (rate & AGP_MODE_V2_RATE_4x)
  382                 rate = AGP_MODE_V2_RATE_4x;
  383         else if (rate & AGP_MODE_V2_RATE_2x)
  384                 rate = AGP_MODE_V2_RATE_2x;
  385         else
  386                 rate = AGP_MODE_V2_RATE_1x;
  387         if (bootverbose)
  388                 device_printf(dev, "Setting AGP v2 mode %d\n", rate);
  389 
  390         /* Construct the new mode word and tell the hardware */
  391         command = AGP_MODE_SET_RQ(0, rq);
  392         command = AGP_MODE_SET_SBA(command, sba);
  393         command = AGP_MODE_SET_FW(command, fw);
  394         command = AGP_MODE_SET_RATE(command, rate);
  395         command = AGP_MODE_SET_AGP(command, 1);
  396         pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4);
  397         pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4);
  398 
  399         return 0;
  400 }
  401 
  402 int
  403 agp_generic_enable(device_t dev, u_int32_t mode)
  404 {
  405         device_t mdev = agp_find_display();
  406         u_int32_t tstatus, mstatus;
  407 
  408         if (!mdev) {
  409                 AGP_DPF("can't find display\n");
  410                 return ENXIO;
  411         }
  412 
  413         tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  414         mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
  415 
  416         /*
  417          * Check display and bridge for AGP v3 support.  AGP v3 allows
  418          * more variety in topology than v2, e.g. multiple AGP devices
  419          * attached to one bridge, or multiple AGP bridges in one
  420          * system.  This doesn't attempt to address those situations,
  421          * but should work fine for a classic single AGP slot system
  422          * with AGP v3.
  423          */
  424         if (AGP_MODE_GET_MODE_3(tstatus) && AGP_MODE_GET_MODE_3(mstatus))
  425                 return (agp_v3_enable(dev, mdev, mode));
  426         else
  427                 return (agp_v2_enable(dev, mdev, mode));            
  428 }
  429 
  430 struct agp_memory *
  431 agp_generic_alloc_memory(device_t dev, int type, vm_size_t size)
  432 {
  433         struct agp_softc *sc = device_get_softc(dev);
  434         struct agp_memory *mem;
  435 
  436         if ((size & (AGP_PAGE_SIZE - 1)) != 0)
  437                 return 0;
  438 
  439         if (sc->as_allocated + size > sc->as_maxmem)
  440                 return 0;
  441 
  442         if (type != 0) {
  443                 printf("agp_generic_alloc_memory: unsupported type %d\n",
  444                        type);
  445                 return 0;
  446         }
  447 
  448         mem = malloc(sizeof *mem, M_AGP, M_WAITOK);
  449         mem->am_id = sc->as_nextid++;
  450         mem->am_size = size;
  451         mem->am_type = 0;
  452         mem->am_obj = vm_object_allocate(OBJT_DEFAULT, atop(round_page(size)));
  453         mem->am_physical = 0;
  454         mem->am_offset = 0;
  455         mem->am_is_bound = 0;
  456         TAILQ_INSERT_TAIL(&sc->as_memory, mem, am_link);
  457         sc->as_allocated += size;
  458 
  459         return mem;
  460 }
  461 
  462 int
  463 agp_generic_free_memory(device_t dev, struct agp_memory *mem)
  464 {
  465         struct agp_softc *sc = device_get_softc(dev);
  466 
  467         if (mem->am_is_bound)
  468                 return EBUSY;
  469 
  470         sc->as_allocated -= mem->am_size;
  471         TAILQ_REMOVE(&sc->as_memory, mem, am_link);
  472         vm_object_deallocate(mem->am_obj);
  473         free(mem, M_AGP);
  474         return 0;
  475 }
  476 
  477 int
  478 agp_generic_bind_memory(device_t dev, struct agp_memory *mem,
  479                         vm_offset_t offset)
  480 {
  481         struct agp_softc *sc = device_get_softc(dev);
  482         vm_offset_t i, j, k;
  483         vm_page_t m;
  484         int error;
  485 
  486         /* Do some sanity checks first. */
  487         if (offset < 0 || (offset & (AGP_PAGE_SIZE - 1)) != 0 ||
  488             offset + mem->am_size > AGP_GET_APERTURE(dev)) {
  489                 device_printf(dev, "binding memory at bad offset %#x\n",
  490                     (int)offset);
  491                 return EINVAL;
  492         }
  493 
  494         /*
  495          * Allocate the pages early, before acquiring the lock,
  496          * because vm_page_grab() used with VM_ALLOC_RETRY may
  497          * block and we can't hold a mutex while blocking.
  498          */
  499         VM_OBJECT_LOCK(mem->am_obj);
  500         for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
  501                 /*
  502                  * Find a page from the object and wire it
  503                  * down. This page will be mapped using one or more
  504                  * entries in the GATT (assuming that PAGE_SIZE >=
  505                  * AGP_PAGE_SIZE. If this is the first call to bind,
  506                  * the pages will be allocated and zeroed.
  507                  */
  508                 m = vm_page_grab(mem->am_obj, OFF_TO_IDX(i),
  509                     VM_ALLOC_WIRED | VM_ALLOC_ZERO | VM_ALLOC_RETRY);
  510                 AGP_DPF("found page pa=%#x\n", VM_PAGE_TO_PHYS(m));
  511         }
  512         VM_OBJECT_UNLOCK(mem->am_obj);
  513 
  514         mtx_lock(&sc->as_lock);
  515 
  516         if (mem->am_is_bound) {
  517                 device_printf(dev, "memory already bound\n");
  518                 error = EINVAL;
  519                 VM_OBJECT_LOCK(mem->am_obj);
  520                 goto bad;
  521         }
  522         
  523         /*
  524          * Bind the individual pages and flush the chipset's
  525          * TLB.
  526          *
  527          * XXX Presumably, this needs to be the pci address on alpha
  528          * (i.e. use alpha_XXX_dmamap()). I don't have access to any
  529          * alpha AGP hardware to check.
  530          */
  531         VM_OBJECT_LOCK(mem->am_obj);
  532         for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
  533                 m = vm_page_lookup(mem->am_obj, OFF_TO_IDX(i));
  534 
  535                 /*
  536                  * Install entries in the GATT, making sure that if
  537                  * AGP_PAGE_SIZE < PAGE_SIZE and mem->am_size is not
  538                  * aligned to PAGE_SIZE, we don't modify too many GATT 
  539                  * entries.
  540                  */
  541                 for (j = 0; j < PAGE_SIZE && i + j < mem->am_size;
  542                      j += AGP_PAGE_SIZE) {
  543                         vm_offset_t pa = VM_PAGE_TO_PHYS(m) + j;
  544                         AGP_DPF("binding offset %#x to pa %#x\n",
  545                                 offset + i + j, pa);
  546                         error = AGP_BIND_PAGE(dev, offset + i + j, pa);
  547                         if (error) {
  548                                 /*
  549                                  * Bail out. Reverse all the mappings
  550                                  * and unwire the pages.
  551                                  */
  552                                 vm_page_lock_queues();
  553                                 vm_page_wakeup(m);
  554                                 vm_page_unlock_queues();
  555                                 for (k = 0; k < i + j; k += AGP_PAGE_SIZE)
  556                                         AGP_UNBIND_PAGE(dev, offset + k);
  557                                 goto bad;
  558                         }
  559                 }
  560                 vm_page_lock_queues();
  561                 vm_page_wakeup(m);
  562                 vm_page_unlock_queues();
  563         }
  564         VM_OBJECT_UNLOCK(mem->am_obj);
  565 
  566         /*
  567          * Flush the cpu cache since we are providing a new mapping
  568          * for these pages.
  569          */
  570         agp_flush_cache();
  571 
  572         /*
  573          * Make sure the chipset gets the new mappings.
  574          */
  575         AGP_FLUSH_TLB(dev);
  576 
  577         mem->am_offset = offset;
  578         mem->am_is_bound = 1;
  579 
  580         mtx_unlock(&sc->as_lock);
  581 
  582         return 0;
  583 bad:
  584         mtx_unlock(&sc->as_lock);
  585         VM_OBJECT_LOCK_ASSERT(mem->am_obj, MA_OWNED);
  586         for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
  587                 m = vm_page_lookup(mem->am_obj, OFF_TO_IDX(i));
  588                 vm_page_lock_queues();
  589                 vm_page_unwire(m, 0);
  590                 vm_page_unlock_queues();
  591         }
  592         VM_OBJECT_UNLOCK(mem->am_obj);
  593 
  594         return error;
  595 }
  596 
  597 int
  598 agp_generic_unbind_memory(device_t dev, struct agp_memory *mem)
  599 {
  600         struct agp_softc *sc = device_get_softc(dev);
  601         vm_page_t m;
  602         int i;
  603 
  604         mtx_lock(&sc->as_lock);
  605 
  606         if (!mem->am_is_bound) {
  607                 device_printf(dev, "memory is not bound\n");
  608                 mtx_unlock(&sc->as_lock);
  609                 return EINVAL;
  610         }
  611 
  612 
  613         /*
  614          * Unbind the individual pages and flush the chipset's
  615          * TLB. Unwire the pages so they can be swapped.
  616          */
  617         for (i = 0; i < mem->am_size; i += AGP_PAGE_SIZE)
  618                 AGP_UNBIND_PAGE(dev, mem->am_offset + i);
  619         VM_OBJECT_LOCK(mem->am_obj);
  620         for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
  621                 m = vm_page_lookup(mem->am_obj, atop(i));
  622                 vm_page_lock_queues();
  623                 vm_page_unwire(m, 0);
  624                 vm_page_unlock_queues();
  625         }
  626         VM_OBJECT_UNLOCK(mem->am_obj);
  627                 
  628         agp_flush_cache();
  629         AGP_FLUSH_TLB(dev);
  630 
  631         mem->am_offset = 0;
  632         mem->am_is_bound = 0;
  633 
  634         mtx_unlock(&sc->as_lock);
  635 
  636         return 0;
  637 }
  638 
  639 /* Helper functions for implementing user/kernel api */
  640 
  641 static int
  642 agp_acquire_helper(device_t dev, enum agp_acquire_state state)
  643 {
  644         struct agp_softc *sc = device_get_softc(dev);
  645 
  646         if (sc->as_state != AGP_ACQUIRE_FREE)
  647                 return EBUSY;
  648         sc->as_state = state;
  649 
  650         return 0;
  651 }
  652 
  653 static int
  654 agp_release_helper(device_t dev, enum agp_acquire_state state)
  655 {
  656         struct agp_softc *sc = device_get_softc(dev);
  657 
  658         if (sc->as_state == AGP_ACQUIRE_FREE)
  659                 return 0;
  660 
  661         if (sc->as_state != state)
  662                 return EBUSY;
  663 
  664         sc->as_state = AGP_ACQUIRE_FREE;
  665         return 0;
  666 }
  667 
  668 static struct agp_memory *
  669 agp_find_memory(device_t dev, int id)
  670 {
  671         struct agp_softc *sc = device_get_softc(dev);
  672         struct agp_memory *mem;
  673 
  674         AGP_DPF("searching for memory block %d\n", id);
  675         TAILQ_FOREACH(mem, &sc->as_memory, am_link) {
  676                 AGP_DPF("considering memory block %d\n", mem->am_id);
  677                 if (mem->am_id == id)
  678                         return mem;
  679         }
  680         return 0;
  681 }
  682 
  683 /* Implementation of the userland ioctl api */
  684 
  685 static int
  686 agp_info_user(device_t dev, agp_info *info)
  687 {
  688         struct agp_softc *sc = device_get_softc(dev);
  689 
  690         bzero(info, sizeof *info);
  691         info->bridge_id = pci_get_devid(dev);
  692         info->agp_mode = 
  693             pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  694         info->aper_base = rman_get_start(sc->as_aperture);
  695         info->aper_size = AGP_GET_APERTURE(dev) >> 20;
  696         info->pg_total = info->pg_system = sc->as_maxmem >> AGP_PAGE_SHIFT;
  697         info->pg_used = sc->as_allocated >> AGP_PAGE_SHIFT;
  698 
  699         return 0;
  700 }
  701 
  702 static int
  703 agp_setup_user(device_t dev, agp_setup *setup)
  704 {
  705         return AGP_ENABLE(dev, setup->agp_mode);
  706 }
  707 
  708 static int
  709 agp_allocate_user(device_t dev, agp_allocate *alloc)
  710 {
  711         struct agp_memory *mem;
  712 
  713         mem = AGP_ALLOC_MEMORY(dev,
  714                                alloc->type,
  715                                alloc->pg_count << AGP_PAGE_SHIFT);
  716         if (mem) {
  717                 alloc->key = mem->am_id;
  718                 alloc->physical = mem->am_physical;
  719                 return 0;
  720         } else {
  721                 return ENOMEM;
  722         }
  723 }
  724 
  725 static int
  726 agp_deallocate_user(device_t dev, int id)
  727 {
  728         struct agp_memory *mem = agp_find_memory(dev, id);;
  729 
  730         if (mem) {
  731                 AGP_FREE_MEMORY(dev, mem);
  732                 return 0;
  733         } else {
  734                 return ENOENT;
  735         }
  736 }
  737 
  738 static int
  739 agp_bind_user(device_t dev, agp_bind *bind)
  740 {
  741         struct agp_memory *mem = agp_find_memory(dev, bind->key);
  742 
  743         if (!mem)
  744                 return ENOENT;
  745 
  746         return AGP_BIND_MEMORY(dev, mem, bind->pg_start << AGP_PAGE_SHIFT);
  747 }
  748 
  749 static int
  750 agp_unbind_user(device_t dev, agp_unbind *unbind)
  751 {
  752         struct agp_memory *mem = agp_find_memory(dev, unbind->key);
  753 
  754         if (!mem)
  755                 return ENOENT;
  756 
  757         return AGP_UNBIND_MEMORY(dev, mem);
  758 }
  759 
  760 static int
  761 agp_open(struct cdev *kdev, int oflags, int devtype, struct thread *td)
  762 {
  763         device_t dev = KDEV2DEV(kdev);
  764         struct agp_softc *sc = device_get_softc(dev);
  765 
  766         if (!sc->as_isopen) {
  767                 sc->as_isopen = 1;
  768                 device_busy(dev);
  769         }
  770 
  771         return 0;
  772 }
  773 
  774 static int
  775 agp_close(struct cdev *kdev, int fflag, int devtype, struct thread *td)
  776 {
  777         device_t dev = KDEV2DEV(kdev);
  778         struct agp_softc *sc = device_get_softc(dev);
  779         struct agp_memory *mem;
  780 
  781         /*
  782          * Clear the GATT and force release on last close
  783          */
  784         while ((mem = TAILQ_FIRST(&sc->as_memory)) != 0) {
  785                 if (mem->am_is_bound)
  786                         AGP_UNBIND_MEMORY(dev, mem);
  787                 AGP_FREE_MEMORY(dev, mem);
  788         }
  789         if (sc->as_state == AGP_ACQUIRE_USER)
  790                 agp_release_helper(dev, AGP_ACQUIRE_USER);
  791         sc->as_isopen = 0;
  792         device_unbusy(dev);
  793 
  794         return 0;
  795 }
  796 
  797 static int
  798 agp_ioctl(struct cdev *kdev, u_long cmd, caddr_t data, int fflag, struct thread *td)
  799 {
  800         device_t dev = KDEV2DEV(kdev);
  801 
  802         switch (cmd) {
  803         case AGPIOC_INFO:
  804                 return agp_info_user(dev, (agp_info *) data);
  805 
  806         case AGPIOC_ACQUIRE:
  807                 return agp_acquire_helper(dev, AGP_ACQUIRE_USER);
  808 
  809         case AGPIOC_RELEASE:
  810                 return agp_release_helper(dev, AGP_ACQUIRE_USER);
  811 
  812         case AGPIOC_SETUP:
  813                 return agp_setup_user(dev, (agp_setup *)data);
  814 
  815         case AGPIOC_ALLOCATE:
  816                 return agp_allocate_user(dev, (agp_allocate *)data);
  817 
  818         case AGPIOC_DEALLOCATE:
  819                 return agp_deallocate_user(dev, *(int *) data);
  820 
  821         case AGPIOC_BIND:
  822                 return agp_bind_user(dev, (agp_bind *)data);
  823 
  824         case AGPIOC_UNBIND:
  825                 return agp_unbind_user(dev, (agp_unbind *)data);
  826 
  827         }
  828 
  829         return EINVAL;
  830 }
  831 
  832 static int
  833 agp_mmap(struct cdev *kdev, vm_offset_t offset, vm_paddr_t *paddr, int prot)
  834 {
  835         device_t dev = KDEV2DEV(kdev);
  836         struct agp_softc *sc = device_get_softc(dev);
  837 
  838         if (offset > AGP_GET_APERTURE(dev))
  839                 return -1;
  840         *paddr = rman_get_start(sc->as_aperture) + offset;
  841         return 0;
  842 }
  843 
  844 /* Implementation of the kernel api */
  845 
  846 device_t
  847 agp_find_device()
  848 {
  849         if (!agp_devclass)
  850                 return 0;
  851         return devclass_get_device(agp_devclass, 0);
  852 }
  853 
  854 enum agp_acquire_state
  855 agp_state(device_t dev)
  856 {
  857         struct agp_softc *sc = device_get_softc(dev);
  858         return sc->as_state;
  859 }
  860 
  861 void
  862 agp_get_info(device_t dev, struct agp_info *info)
  863 {
  864         struct agp_softc *sc = device_get_softc(dev);
  865 
  866         info->ai_mode =
  867                 pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  868         info->ai_aperture_base = rman_get_start(sc->as_aperture);
  869         info->ai_aperture_size = rman_get_size(sc->as_aperture);
  870         info->ai_aperture_va = (vm_offset_t) rman_get_virtual(sc->as_aperture);
  871         info->ai_memory_allowed = sc->as_maxmem;
  872         info->ai_memory_used = sc->as_allocated;
  873 }
  874 
  875 int
  876 agp_acquire(device_t dev)
  877 {
  878         return agp_acquire_helper(dev, AGP_ACQUIRE_KERNEL);
  879 }
  880 
  881 int
  882 agp_release(device_t dev)
  883 {
  884         return agp_release_helper(dev, AGP_ACQUIRE_KERNEL);
  885 }
  886 
  887 int
  888 agp_enable(device_t dev, u_int32_t mode)
  889 {
  890         return AGP_ENABLE(dev, mode);
  891 }
  892 
  893 void *agp_alloc_memory(device_t dev, int type, vm_size_t bytes)
  894 {
  895         return  (void *) AGP_ALLOC_MEMORY(dev, type, bytes);
  896 }
  897 
  898 void agp_free_memory(device_t dev, void *handle)
  899 {
  900         struct agp_memory *mem = (struct agp_memory *) handle;
  901         AGP_FREE_MEMORY(dev, mem);
  902 }
  903 
  904 int agp_bind_memory(device_t dev, void *handle, vm_offset_t offset)
  905 {
  906         struct agp_memory *mem = (struct agp_memory *) handle;
  907         return AGP_BIND_MEMORY(dev, mem, offset);
  908 }
  909 
  910 int agp_unbind_memory(device_t dev, void *handle)
  911 {
  912         struct agp_memory *mem = (struct agp_memory *) handle;
  913         return AGP_UNBIND_MEMORY(dev, mem);
  914 }
  915 
  916 void agp_memory_info(device_t dev, void *handle, struct
  917                      agp_memory_info *mi)
  918 {
  919         struct agp_memory *mem = (struct agp_memory *) handle;
  920 
  921         mi->ami_size = mem->am_size;
  922         mi->ami_physical = mem->am_physical;
  923         mi->ami_offset = mem->am_offset;
  924         mi->ami_is_bound = mem->am_is_bound;
  925 }
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FreeBSD/Linux Kernel Cross Reference sys/pci/agp.c

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