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/9.0/sys/dev/agp/agp.c 219902 2011-03-23 13:10:15Z jhb $");
   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_cap(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 
  223         if (sc->as_aperture_rid != -1) {
  224                 if (sc->as_aperture_rid == 0)
  225                         sc->as_aperture_rid = AGP_APBASE;
  226 
  227                 sc->as_aperture = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
  228                     &sc->as_aperture_rid, RF_SHAREABLE);
  229                 if (!sc->as_aperture)
  230                         return ENOMEM;
  231         }
  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         mtx_init(&sc->as_lock, "agp lock", NULL, MTX_DEF);
  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             0, UID_ROOT, GID_WHEEL, 0600, "agpgart");
  260         sc->as_devnode->si_drv1 = dev;
  261 
  262         return 0;
  263 }
  264 
  265 void
  266 agp_free_cdev(device_t dev)
  267 {
  268         struct agp_softc *sc = device_get_softc(dev);
  269 
  270         destroy_dev(sc->as_devnode);
  271 }
  272 
  273 void
  274 agp_free_res(device_t dev)
  275 {
  276         struct agp_softc *sc = device_get_softc(dev);
  277 
  278         if (sc->as_aperture != NULL)
  279                 bus_release_resource(dev, SYS_RES_MEMORY, sc->as_aperture_rid,
  280                     sc->as_aperture);
  281         mtx_destroy(&sc->as_lock);
  282         agp_flush_cache();
  283 }
  284 
  285 int
  286 agp_generic_detach(device_t dev)
  287 {
  288 
  289         agp_free_cdev(dev);
  290         agp_free_res(dev);
  291         return 0;
  292 }
  293 
  294 /**
  295  * Default AGP aperture size detection which simply returns the size of
  296  * the aperture's PCI resource.
  297  */
  298 u_int32_t
  299 agp_generic_get_aperture(device_t dev)
  300 {
  301         struct agp_softc *sc = device_get_softc(dev);
  302 
  303         return rman_get_size(sc->as_aperture);
  304 }
  305 
  306 /**
  307  * Default AGP aperture size setting function, which simply doesn't allow
  308  * changes to resource size.
  309  */
  310 int
  311 agp_generic_set_aperture(device_t dev, u_int32_t aperture)
  312 {
  313         u_int32_t current_aperture;
  314 
  315         current_aperture = AGP_GET_APERTURE(dev);
  316         if (current_aperture != aperture)
  317                 return EINVAL;
  318         else
  319                 return 0;
  320 }
  321 
  322 /*
  323  * This does the enable logic for v3, with the same topology
  324  * restrictions as in place for v2 -- one bus, one device on the bus.
  325  */
  326 static int
  327 agp_v3_enable(device_t dev, device_t mdev, u_int32_t mode)
  328 {
  329         u_int32_t tstatus, mstatus;
  330         u_int32_t command;
  331         int rq, sba, fw, rate, arqsz, cal;
  332 
  333         tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  334         mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
  335 
  336         /* Set RQ to the min of mode, tstatus and mstatus */
  337         rq = AGP_MODE_GET_RQ(mode);
  338         if (AGP_MODE_GET_RQ(tstatus) < rq)
  339                 rq = AGP_MODE_GET_RQ(tstatus);
  340         if (AGP_MODE_GET_RQ(mstatus) < rq)
  341                 rq = AGP_MODE_GET_RQ(mstatus);
  342 
  343         /*
  344          * ARQSZ - Set the value to the maximum one.
  345          * Don't allow the mode register to override values.
  346          */
  347         arqsz = AGP_MODE_GET_ARQSZ(mode);
  348         if (AGP_MODE_GET_ARQSZ(tstatus) > rq)
  349                 rq = AGP_MODE_GET_ARQSZ(tstatus);
  350         if (AGP_MODE_GET_ARQSZ(mstatus) > rq)
  351                 rq = AGP_MODE_GET_ARQSZ(mstatus);
  352 
  353         /* Calibration cycle - don't allow override by mode register */
  354         cal = AGP_MODE_GET_CAL(tstatus);
  355         if (AGP_MODE_GET_CAL(mstatus) < cal)
  356                 cal = AGP_MODE_GET_CAL(mstatus);
  357 
  358         /* SBA must be supported for AGP v3. */
  359         sba = 1;
  360 
  361         /* Set FW if all three support it. */
  362         fw = (AGP_MODE_GET_FW(tstatus)
  363                & AGP_MODE_GET_FW(mstatus)
  364                & AGP_MODE_GET_FW(mode));
  365         
  366         /* Figure out the max rate */
  367         rate = (AGP_MODE_GET_RATE(tstatus)
  368                 & AGP_MODE_GET_RATE(mstatus)
  369                 & AGP_MODE_GET_RATE(mode));
  370         if (rate & AGP_MODE_V3_RATE_8x)
  371                 rate = AGP_MODE_V3_RATE_8x;
  372         else
  373                 rate = AGP_MODE_V3_RATE_4x;
  374         if (bootverbose)
  375                 device_printf(dev, "Setting AGP v3 mode %d\n", rate * 4);
  376 
  377         pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, 0, 4);
  378 
  379         /* Construct the new mode word and tell the hardware */
  380         command = 0;
  381         command = AGP_MODE_SET_RQ(0, rq);
  382         command = AGP_MODE_SET_ARQSZ(command, arqsz);
  383         command = AGP_MODE_SET_CAL(command, cal);
  384         command = AGP_MODE_SET_SBA(command, sba);
  385         command = AGP_MODE_SET_FW(command, fw);
  386         command = AGP_MODE_SET_RATE(command, rate);
  387         command = AGP_MODE_SET_MODE_3(command, 1);
  388         command = AGP_MODE_SET_AGP(command, 1);
  389         pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4);
  390         pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4);
  391 
  392         return 0;
  393 }
  394 
  395 static int
  396 agp_v2_enable(device_t dev, device_t mdev, u_int32_t mode)
  397 {
  398         u_int32_t tstatus, mstatus;
  399         u_int32_t command;
  400         int rq, sba, fw, rate;
  401 
  402         tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  403         mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
  404 
  405         /* Set RQ to the min of mode, tstatus and mstatus */
  406         rq = AGP_MODE_GET_RQ(mode);
  407         if (AGP_MODE_GET_RQ(tstatus) < rq)
  408                 rq = AGP_MODE_GET_RQ(tstatus);
  409         if (AGP_MODE_GET_RQ(mstatus) < rq)
  410                 rq = AGP_MODE_GET_RQ(mstatus);
  411 
  412         /* Set SBA if all three can deal with SBA */
  413         sba = (AGP_MODE_GET_SBA(tstatus)
  414                & AGP_MODE_GET_SBA(mstatus)
  415                & AGP_MODE_GET_SBA(mode));
  416 
  417         /* Similar for FW */
  418         fw = (AGP_MODE_GET_FW(tstatus)
  419                & AGP_MODE_GET_FW(mstatus)
  420                & AGP_MODE_GET_FW(mode));
  421 
  422         /* Figure out the max rate */
  423         rate = (AGP_MODE_GET_RATE(tstatus)
  424                 & AGP_MODE_GET_RATE(mstatus)
  425                 & AGP_MODE_GET_RATE(mode));
  426         if (rate & AGP_MODE_V2_RATE_4x)
  427                 rate = AGP_MODE_V2_RATE_4x;
  428         else if (rate & AGP_MODE_V2_RATE_2x)
  429                 rate = AGP_MODE_V2_RATE_2x;
  430         else
  431                 rate = AGP_MODE_V2_RATE_1x;
  432         if (bootverbose)
  433                 device_printf(dev, "Setting AGP v2 mode %d\n", rate);
  434 
  435         /* Construct the new mode word and tell the hardware */
  436         command = 0;
  437         command = AGP_MODE_SET_RQ(0, rq);
  438         command = AGP_MODE_SET_SBA(command, sba);
  439         command = AGP_MODE_SET_FW(command, fw);
  440         command = AGP_MODE_SET_RATE(command, rate);
  441         command = AGP_MODE_SET_AGP(command, 1);
  442         pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4);
  443         pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4);
  444 
  445         return 0;
  446 }
  447 
  448 int
  449 agp_generic_enable(device_t dev, u_int32_t mode)
  450 {
  451         device_t mdev = agp_find_display();
  452         u_int32_t tstatus, mstatus;
  453 
  454         if (!mdev) {
  455                 AGP_DPF("can't find display\n");
  456                 return ENXIO;
  457         }
  458 
  459         tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  460         mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
  461 
  462         /*
  463          * Check display and bridge for AGP v3 support.  AGP v3 allows
  464          * more variety in topology than v2, e.g. multiple AGP devices
  465          * attached to one bridge, or multiple AGP bridges in one
  466          * system.  This doesn't attempt to address those situations,
  467          * but should work fine for a classic single AGP slot system
  468          * with AGP v3.
  469          */
  470         if (AGP_MODE_GET_MODE_3(mode) &&
  471             AGP_MODE_GET_MODE_3(tstatus) &&
  472             AGP_MODE_GET_MODE_3(mstatus))
  473                 return (agp_v3_enable(dev, mdev, mode));
  474         else
  475                 return (agp_v2_enable(dev, mdev, mode));            
  476 }
  477 
  478 struct agp_memory *
  479 agp_generic_alloc_memory(device_t dev, int type, vm_size_t size)
  480 {
  481         struct agp_softc *sc = device_get_softc(dev);
  482         struct agp_memory *mem;
  483 
  484         if ((size & (AGP_PAGE_SIZE - 1)) != 0)
  485                 return 0;
  486 
  487         if (sc->as_allocated + size > sc->as_maxmem)
  488                 return 0;
  489 
  490         if (type != 0) {
  491                 printf("agp_generic_alloc_memory: unsupported type %d\n",
  492                        type);
  493                 return 0;
  494         }
  495 
  496         mem = malloc(sizeof *mem, M_AGP, M_WAITOK);
  497         mem->am_id = sc->as_nextid++;
  498         mem->am_size = size;
  499         mem->am_type = 0;
  500         mem->am_obj = vm_object_allocate(OBJT_DEFAULT, atop(round_page(size)));
  501         mem->am_physical = 0;
  502         mem->am_offset = 0;
  503         mem->am_is_bound = 0;
  504         TAILQ_INSERT_TAIL(&sc->as_memory, mem, am_link);
  505         sc->as_allocated += size;
  506 
  507         return mem;
  508 }
  509 
  510 int
  511 agp_generic_free_memory(device_t dev, struct agp_memory *mem)
  512 {
  513         struct agp_softc *sc = device_get_softc(dev);
  514 
  515         if (mem->am_is_bound)
  516                 return EBUSY;
  517 
  518         sc->as_allocated -= mem->am_size;
  519         TAILQ_REMOVE(&sc->as_memory, mem, am_link);
  520         vm_object_deallocate(mem->am_obj);
  521         free(mem, M_AGP);
  522         return 0;
  523 }
  524 
  525 int
  526 agp_generic_bind_memory(device_t dev, struct agp_memory *mem,
  527                         vm_offset_t offset)
  528 {
  529         struct agp_softc *sc = device_get_softc(dev);
  530         vm_offset_t i, j, k;
  531         vm_page_t m;
  532         int error;
  533 
  534         /* Do some sanity checks first. */
  535         if ((offset & (AGP_PAGE_SIZE - 1)) != 0 ||
  536             offset + mem->am_size > AGP_GET_APERTURE(dev)) {
  537                 device_printf(dev, "binding memory at bad offset %#x\n",
  538                     (int)offset);
  539                 return EINVAL;
  540         }
  541 
  542         /*
  543          * Allocate the pages early, before acquiring the lock,
  544          * because vm_page_grab() may sleep and we can't hold a mutex
  545          * while sleeping.
  546          */
  547         VM_OBJECT_LOCK(mem->am_obj);
  548         for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
  549                 /*
  550                  * Find a page from the object and wire it
  551                  * down. This page will be mapped using one or more
  552                  * entries in the GATT (assuming that PAGE_SIZE >=
  553                  * AGP_PAGE_SIZE. If this is the first call to bind,
  554                  * the pages will be allocated and zeroed.
  555                  */
  556                 m = vm_page_grab(mem->am_obj, OFF_TO_IDX(i),
  557                     VM_ALLOC_WIRED | VM_ALLOC_ZERO | VM_ALLOC_RETRY);
  558                 AGP_DPF("found page pa=%#jx\n", (uintmax_t)VM_PAGE_TO_PHYS(m));
  559         }
  560         VM_OBJECT_UNLOCK(mem->am_obj);
  561 
  562         mtx_lock(&sc->as_lock);
  563 
  564         if (mem->am_is_bound) {
  565                 device_printf(dev, "memory already bound\n");
  566                 error = EINVAL;
  567                 VM_OBJECT_LOCK(mem->am_obj);
  568                 i = 0;
  569                 goto bad;
  570         }
  571         
  572         /*
  573          * Bind the individual pages and flush the chipset's
  574          * TLB.
  575          */
  576         VM_OBJECT_LOCK(mem->am_obj);
  577         for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
  578                 m = vm_page_lookup(mem->am_obj, OFF_TO_IDX(i));
  579 
  580                 /*
  581                  * Install entries in the GATT, making sure that if
  582                  * AGP_PAGE_SIZE < PAGE_SIZE and mem->am_size is not
  583                  * aligned to PAGE_SIZE, we don't modify too many GATT 
  584                  * entries.
  585                  */
  586                 for (j = 0; j < PAGE_SIZE && i + j < mem->am_size;
  587                      j += AGP_PAGE_SIZE) {
  588                         vm_offset_t pa = VM_PAGE_TO_PHYS(m) + j;
  589                         AGP_DPF("binding offset %#jx to pa %#jx\n",
  590                                 (uintmax_t)offset + i + j, (uintmax_t)pa);
  591                         error = AGP_BIND_PAGE(dev, offset + i + j, pa);
  592                         if (error) {
  593                                 /*
  594                                  * Bail out. Reverse all the mappings
  595                                  * and unwire the pages.
  596                                  */
  597                                 for (k = 0; k < i + j; k += AGP_PAGE_SIZE)
  598                                         AGP_UNBIND_PAGE(dev, offset + k);
  599                                 goto bad;
  600                         }
  601                 }
  602                 vm_page_wakeup(m);
  603         }
  604         VM_OBJECT_UNLOCK(mem->am_obj);
  605 
  606         /*
  607          * Flush the cpu cache since we are providing a new mapping
  608          * for these pages.
  609          */
  610         agp_flush_cache();
  611 
  612         /*
  613          * Make sure the chipset gets the new mappings.
  614          */
  615         AGP_FLUSH_TLB(dev);
  616 
  617         mem->am_offset = offset;
  618         mem->am_is_bound = 1;
  619 
  620         mtx_unlock(&sc->as_lock);
  621 
  622         return 0;
  623 bad:
  624         mtx_unlock(&sc->as_lock);
  625         VM_OBJECT_LOCK_ASSERT(mem->am_obj, MA_OWNED);
  626         for (k = 0; k < mem->am_size; k += PAGE_SIZE) {
  627                 m = vm_page_lookup(mem->am_obj, OFF_TO_IDX(k));
  628                 if (k >= i)
  629                         vm_page_wakeup(m);
  630                 vm_page_lock(m);
  631                 vm_page_unwire(m, 0);
  632                 vm_page_unlock(m);
  633         }
  634         VM_OBJECT_UNLOCK(mem->am_obj);
  635 
  636         return error;
  637 }
  638 
  639 int
  640 agp_generic_unbind_memory(device_t dev, struct agp_memory *mem)
  641 {
  642         struct agp_softc *sc = device_get_softc(dev);
  643         vm_page_t m;
  644         int i;
  645 
  646         mtx_lock(&sc->as_lock);
  647 
  648         if (!mem->am_is_bound) {
  649                 device_printf(dev, "memory is not bound\n");
  650                 mtx_unlock(&sc->as_lock);
  651                 return EINVAL;
  652         }
  653 
  654 
  655         /*
  656          * Unbind the individual pages and flush the chipset's
  657          * TLB. Unwire the pages so they can be swapped.
  658          */
  659         for (i = 0; i < mem->am_size; i += AGP_PAGE_SIZE)
  660                 AGP_UNBIND_PAGE(dev, mem->am_offset + i);
  661         VM_OBJECT_LOCK(mem->am_obj);
  662         for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
  663                 m = vm_page_lookup(mem->am_obj, atop(i));
  664                 vm_page_lock(m);
  665                 vm_page_unwire(m, 0);
  666                 vm_page_unlock(m);
  667         }
  668         VM_OBJECT_UNLOCK(mem->am_obj);
  669                 
  670         agp_flush_cache();
  671         AGP_FLUSH_TLB(dev);
  672 
  673         mem->am_offset = 0;
  674         mem->am_is_bound = 0;
  675 
  676         mtx_unlock(&sc->as_lock);
  677 
  678         return 0;
  679 }
  680 
  681 /* Helper functions for implementing user/kernel api */
  682 
  683 static int
  684 agp_acquire_helper(device_t dev, enum agp_acquire_state state)
  685 {
  686         struct agp_softc *sc = device_get_softc(dev);
  687 
  688         if (sc->as_state != AGP_ACQUIRE_FREE)
  689                 return EBUSY;
  690         sc->as_state = state;
  691 
  692         return 0;
  693 }
  694 
  695 static int
  696 agp_release_helper(device_t dev, enum agp_acquire_state state)
  697 {
  698         struct agp_softc *sc = device_get_softc(dev);
  699 
  700         if (sc->as_state == AGP_ACQUIRE_FREE)
  701                 return 0;
  702 
  703         if (sc->as_state != state)
  704                 return EBUSY;
  705 
  706         sc->as_state = AGP_ACQUIRE_FREE;
  707         return 0;
  708 }
  709 
  710 static struct agp_memory *
  711 agp_find_memory(device_t dev, int id)
  712 {
  713         struct agp_softc *sc = device_get_softc(dev);
  714         struct agp_memory *mem;
  715 
  716         AGP_DPF("searching for memory block %d\n", id);
  717         TAILQ_FOREACH(mem, &sc->as_memory, am_link) {
  718                 AGP_DPF("considering memory block %d\n", mem->am_id);
  719                 if (mem->am_id == id)
  720                         return mem;
  721         }
  722         return 0;
  723 }
  724 
  725 /* Implementation of the userland ioctl api */
  726 
  727 static int
  728 agp_info_user(device_t dev, agp_info *info)
  729 {
  730         struct agp_softc *sc = device_get_softc(dev);
  731 
  732         bzero(info, sizeof *info);
  733         info->bridge_id = pci_get_devid(dev);
  734         info->agp_mode = 
  735             pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  736         if (sc->as_aperture)
  737                 info->aper_base = rman_get_start(sc->as_aperture);
  738         else
  739                 info->aper_base = 0;
  740         info->aper_size = AGP_GET_APERTURE(dev) >> 20;
  741         info->pg_total = info->pg_system = sc->as_maxmem >> AGP_PAGE_SHIFT;
  742         info->pg_used = sc->as_allocated >> AGP_PAGE_SHIFT;
  743 
  744         return 0;
  745 }
  746 
  747 static int
  748 agp_setup_user(device_t dev, agp_setup *setup)
  749 {
  750         return AGP_ENABLE(dev, setup->agp_mode);
  751 }
  752 
  753 static int
  754 agp_allocate_user(device_t dev, agp_allocate *alloc)
  755 {
  756         struct agp_memory *mem;
  757 
  758         mem = AGP_ALLOC_MEMORY(dev,
  759                                alloc->type,
  760                                alloc->pg_count << AGP_PAGE_SHIFT);
  761         if (mem) {
  762                 alloc->key = mem->am_id;
  763                 alloc->physical = mem->am_physical;
  764                 return 0;
  765         } else {
  766                 return ENOMEM;
  767         }
  768 }
  769 
  770 static int
  771 agp_deallocate_user(device_t dev, int id)
  772 {
  773         struct agp_memory *mem = agp_find_memory(dev, id);
  774 
  775         if (mem) {
  776                 AGP_FREE_MEMORY(dev, mem);
  777                 return 0;
  778         } else {
  779                 return ENOENT;
  780         }
  781 }
  782 
  783 static int
  784 agp_bind_user(device_t dev, agp_bind *bind)
  785 {
  786         struct agp_memory *mem = agp_find_memory(dev, bind->key);
  787 
  788         if (!mem)
  789                 return ENOENT;
  790 
  791         return AGP_BIND_MEMORY(dev, mem, bind->pg_start << AGP_PAGE_SHIFT);
  792 }
  793 
  794 static int
  795 agp_unbind_user(device_t dev, agp_unbind *unbind)
  796 {
  797         struct agp_memory *mem = agp_find_memory(dev, unbind->key);
  798 
  799         if (!mem)
  800                 return ENOENT;
  801 
  802         return AGP_UNBIND_MEMORY(dev, mem);
  803 }
  804 
  805 static int
  806 agp_open(struct cdev *kdev, int oflags, int devtype, struct thread *td)
  807 {
  808         device_t dev = kdev->si_drv1;
  809         struct agp_softc *sc = device_get_softc(dev);
  810 
  811         if (!sc->as_isopen) {
  812                 sc->as_isopen = 1;
  813                 device_busy(dev);
  814         }
  815 
  816         return 0;
  817 }
  818 
  819 static int
  820 agp_close(struct cdev *kdev, int fflag, int devtype, struct thread *td)
  821 {
  822         device_t dev = kdev->si_drv1;
  823         struct agp_softc *sc = device_get_softc(dev);
  824         struct agp_memory *mem;
  825 
  826         /*
  827          * Clear the GATT and force release on last close
  828          */
  829         while ((mem = TAILQ_FIRST(&sc->as_memory)) != 0) {
  830                 if (mem->am_is_bound)
  831                         AGP_UNBIND_MEMORY(dev, mem);
  832                 AGP_FREE_MEMORY(dev, mem);
  833         }
  834         if (sc->as_state == AGP_ACQUIRE_USER)
  835                 agp_release_helper(dev, AGP_ACQUIRE_USER);
  836         sc->as_isopen = 0;
  837         device_unbusy(dev);
  838 
  839         return 0;
  840 }
  841 
  842 static int
  843 agp_ioctl(struct cdev *kdev, u_long cmd, caddr_t data, int fflag, struct thread *td)
  844 {
  845         device_t dev = kdev->si_drv1;
  846 
  847         switch (cmd) {
  848         case AGPIOC_INFO:
  849                 return agp_info_user(dev, (agp_info *) data);
  850 
  851         case AGPIOC_ACQUIRE:
  852                 return agp_acquire_helper(dev, AGP_ACQUIRE_USER);
  853 
  854         case AGPIOC_RELEASE:
  855                 return agp_release_helper(dev, AGP_ACQUIRE_USER);
  856 
  857         case AGPIOC_SETUP:
  858                 return agp_setup_user(dev, (agp_setup *)data);
  859 
  860         case AGPIOC_ALLOCATE:
  861                 return agp_allocate_user(dev, (agp_allocate *)data);
  862 
  863         case AGPIOC_DEALLOCATE:
  864                 return agp_deallocate_user(dev, *(int *) data);
  865 
  866         case AGPIOC_BIND:
  867                 return agp_bind_user(dev, (agp_bind *)data);
  868 
  869         case AGPIOC_UNBIND:
  870                 return agp_unbind_user(dev, (agp_unbind *)data);
  871 
  872         }
  873 
  874         return EINVAL;
  875 }
  876 
  877 static int
  878 agp_mmap(struct cdev *kdev, vm_ooffset_t offset, vm_paddr_t *paddr,
  879     int prot, vm_memattr_t *memattr)
  880 {
  881         device_t dev = kdev->si_drv1;
  882         struct agp_softc *sc = device_get_softc(dev);
  883 
  884         if (offset > AGP_GET_APERTURE(dev))
  885                 return -1;
  886         if (sc->as_aperture == NULL)
  887                 return -1;
  888         *paddr = rman_get_start(sc->as_aperture) + offset;
  889         return 0;
  890 }
  891 
  892 /* Implementation of the kernel api */
  893 
  894 device_t
  895 agp_find_device()
  896 {
  897         device_t *children, child;
  898         int i, count;
  899 
  900         if (!agp_devclass)
  901                 return NULL;
  902         if (devclass_get_devices(agp_devclass, &children, &count) != 0)
  903                 return NULL;
  904         child = NULL;
  905         for (i = 0; i < count; i++) {
  906                 if (device_is_attached(children[i])) {
  907                         child = children[i];
  908                         break;
  909                 }
  910         }
  911         free(children, M_TEMP);
  912         return child;
  913 }
  914 
  915 enum agp_acquire_state
  916 agp_state(device_t dev)
  917 {
  918         struct agp_softc *sc = device_get_softc(dev);
  919         return sc->as_state;
  920 }
  921 
  922 void
  923 agp_get_info(device_t dev, struct agp_info *info)
  924 {
  925         struct agp_softc *sc = device_get_softc(dev);
  926 
  927         info->ai_mode =
  928                 pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  929         if (sc->as_aperture != NULL)
  930                 info->ai_aperture_base = rman_get_start(sc->as_aperture);
  931         else
  932                 info->ai_aperture_base = 0;
  933         info->ai_aperture_size = AGP_GET_APERTURE(dev);
  934         info->ai_memory_allowed = sc->as_maxmem;
  935         info->ai_memory_used = sc->as_allocated;
  936 }
  937 
  938 int
  939 agp_acquire(device_t dev)
  940 {
  941         return agp_acquire_helper(dev, AGP_ACQUIRE_KERNEL);
  942 }
  943 
  944 int
  945 agp_release(device_t dev)
  946 {
  947         return agp_release_helper(dev, AGP_ACQUIRE_KERNEL);
  948 }
  949 
  950 int
  951 agp_enable(device_t dev, u_int32_t mode)
  952 {
  953         return AGP_ENABLE(dev, mode);
  954 }
  955 
  956 void *agp_alloc_memory(device_t dev, int type, vm_size_t bytes)
  957 {
  958         return  (void *) AGP_ALLOC_MEMORY(dev, type, bytes);
  959 }
  960 
  961 void agp_free_memory(device_t dev, void *handle)
  962 {
  963         struct agp_memory *mem = (struct agp_memory *) handle;
  964         AGP_FREE_MEMORY(dev, mem);
  965 }
  966 
  967 int agp_bind_memory(device_t dev, void *handle, vm_offset_t offset)
  968 {
  969         struct agp_memory *mem = (struct agp_memory *) handle;
  970         return AGP_BIND_MEMORY(dev, mem, offset);
  971 }
  972 
  973 int agp_unbind_memory(device_t dev, void *handle)
  974 {
  975         struct agp_memory *mem = (struct agp_memory *) handle;
  976         return AGP_UNBIND_MEMORY(dev, mem);
  977 }
  978 
  979 void agp_memory_info(device_t dev, void *handle, struct
  980                      agp_memory_info *mi)
  981 {
  982         struct agp_memory *mem = (struct agp_memory *) handle;
  983 
  984         mi->ami_size = mem->am_size;
  985         mi->ami_physical = mem->am_physical;
  986         mi->ami_offset = mem->am_offset;
  987         mi->ami_is_bound = mem->am_is_bound;
  988 }

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