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/11.1/sys/dev/agp/agp.c 315221 2017-03-14 02:06:03Z pfg $");
   29 
   30 #include "opt_agp.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 #include <sys/rwlock.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_extern.h>
   54 #include <vm/vm_kern.h>
   55 #include <vm/vm_param.h>
   56 #include <vm/vm_object.h>
   57 #include <vm/vm_page.h>
   58 #include <vm/vm_pageout.h>
   59 #include <vm/pmap.h>
   60 
   61 #include <machine/bus.h>
   62 #include <machine/resource.h>
   63 #include <sys/rman.h>
   64 
   65 MODULE_VERSION(agp, 1);
   66 
   67 MALLOC_DEFINE(M_AGP, "agp", "AGP data structures");
   68 
   69                                 /* agp_drv.c */
   70 static d_open_t agp_open;
   71 static d_close_t agp_close;
   72 static d_ioctl_t agp_ioctl;
   73 static d_mmap_t agp_mmap;
   74 
   75 static struct cdevsw agp_cdevsw = {
   76         .d_version =    D_VERSION,
   77         .d_flags =      D_NEEDGIANT,
   78         .d_open =       agp_open,
   79         .d_close =      agp_close,
   80         .d_ioctl =      agp_ioctl,
   81         .d_mmap =       agp_mmap,
   82         .d_name =       "agp",
   83 };
   84 
   85 static devclass_t agp_devclass;
   86 
   87 /* Helper functions for implementing chipset mini drivers. */
   88 
   89 u_int8_t
   90 agp_find_caps(device_t dev)
   91 {
   92         int capreg;
   93 
   94 
   95         if (pci_find_cap(dev, PCIY_AGP, &capreg) != 0)
   96                 capreg = 0;
   97         return (capreg);
   98 }
   99 
  100 /*
  101  * Find an AGP display device (if any).
  102  */
  103 static device_t
  104 agp_find_display(void)
  105 {
  106         devclass_t pci = devclass_find("pci");
  107         device_t bus, dev = 0;
  108         device_t *kids;
  109         int busnum, numkids, i;
  110 
  111         for (busnum = 0; busnum < devclass_get_maxunit(pci); busnum++) {
  112                 bus = devclass_get_device(pci, busnum);
  113                 if (!bus)
  114                         continue;
  115                 if (device_get_children(bus, &kids, &numkids) != 0)
  116                         continue;
  117                 for (i = 0; i < numkids; i++) {
  118                         dev = kids[i];
  119                         if (pci_get_class(dev) == PCIC_DISPLAY
  120                             && pci_get_subclass(dev) == PCIS_DISPLAY_VGA)
  121                                 if (agp_find_caps(dev)) {
  122                                         free(kids, M_TEMP);
  123                                         return dev;
  124                                 }
  125                                         
  126                 }
  127                 free(kids, M_TEMP);
  128         }
  129 
  130         return 0;
  131 }
  132 
  133 struct agp_gatt *
  134 agp_alloc_gatt(device_t dev)
  135 {
  136         u_int32_t apsize = AGP_GET_APERTURE(dev);
  137         u_int32_t entries = apsize >> AGP_PAGE_SHIFT;
  138         struct agp_gatt *gatt;
  139 
  140         if (bootverbose)
  141                 device_printf(dev,
  142                               "allocating GATT for aperture of size %dM\n",
  143                               apsize / (1024*1024));
  144 
  145         if (entries == 0) {
  146                 device_printf(dev, "bad aperture size\n");
  147                 return NULL;
  148         }
  149 
  150         gatt = malloc(sizeof(struct agp_gatt), M_AGP, M_NOWAIT);
  151         if (!gatt)
  152                 return 0;
  153 
  154         gatt->ag_entries = entries;
  155         gatt->ag_virtual = (void *)kmem_alloc_contig(kernel_arena,
  156             entries * sizeof(u_int32_t), M_NOWAIT | M_ZERO, 0, ~0, PAGE_SIZE,
  157             0, VM_MEMATTR_WRITE_COMBINING);
  158         if (!gatt->ag_virtual) {
  159                 if (bootverbose)
  160                         device_printf(dev, "contiguous allocation failed\n");
  161                 free(gatt, M_AGP);
  162                 return 0;
  163         }
  164         gatt->ag_physical = vtophys((vm_offset_t) gatt->ag_virtual);
  165 
  166         return gatt;
  167 }
  168 
  169 void
  170 agp_free_gatt(struct agp_gatt *gatt)
  171 {
  172         kmem_free(kernel_arena, (vm_offset_t)gatt->ag_virtual,
  173             gatt->ag_entries * sizeof(u_int32_t));
  174         free(gatt, M_AGP);
  175 }
  176 
  177 static u_int agp_max[][2] = {
  178         {0,     0},
  179         {32,    4},
  180         {64,    28},
  181         {128,   96},
  182         {256,   204},
  183         {512,   440},
  184         {1024,  942},
  185         {2048,  1920},
  186         {4096,  3932}
  187 };
  188 #define AGP_MAX_SIZE    nitems(agp_max)
  189 
  190 /**
  191  * Sets the PCI resource which represents the AGP aperture.
  192  *
  193  * If not called, the default AGP aperture resource of AGP_APBASE will
  194  * be used.  Must be called before agp_generic_attach().
  195  */
  196 void
  197 agp_set_aperture_resource(device_t dev, int rid)
  198 {
  199         struct agp_softc *sc = device_get_softc(dev);
  200 
  201         sc->as_aperture_rid = rid;
  202 }
  203 
  204 int
  205 agp_generic_attach(device_t dev)
  206 {
  207         struct agp_softc *sc = device_get_softc(dev);
  208         int i;
  209         u_int memsize;
  210 
  211         /*
  212          * Find and map the aperture, RF_SHAREABLE for DRM but not RF_ACTIVE
  213          * because the kernel doesn't need to map it.
  214          */
  215 
  216         if (sc->as_aperture_rid != -1) {
  217                 if (sc->as_aperture_rid == 0)
  218                         sc->as_aperture_rid = AGP_APBASE;
  219 
  220                 sc->as_aperture = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
  221                     &sc->as_aperture_rid, RF_SHAREABLE);
  222                 if (!sc->as_aperture)
  223                         return ENOMEM;
  224         }
  225 
  226         /*
  227          * Work out an upper bound for agp memory allocation. This
  228          * uses a heurisitc table from the Linux driver.
  229          */
  230         memsize = ptoa(realmem) >> 20;
  231         for (i = 0; i < AGP_MAX_SIZE; i++) {
  232                 if (memsize <= agp_max[i][0])
  233                         break;
  234         }
  235         if (i == AGP_MAX_SIZE)
  236                 i = AGP_MAX_SIZE - 1;
  237         sc->as_maxmem = agp_max[i][1] << 20U;
  238 
  239         /*
  240          * The lock is used to prevent re-entry to
  241          * agp_generic_bind_memory() since that function can sleep.
  242          */
  243         mtx_init(&sc->as_lock, "agp lock", NULL, MTX_DEF);
  244 
  245         /*
  246          * Initialise stuff for the userland device.
  247          */
  248         agp_devclass = devclass_find("agp");
  249         TAILQ_INIT(&sc->as_memory);
  250         sc->as_nextid = 1;
  251 
  252         sc->as_devnode = make_dev(&agp_cdevsw,
  253             0, UID_ROOT, GID_WHEEL, 0600, "agpgart");
  254         sc->as_devnode->si_drv1 = dev;
  255 
  256         return 0;
  257 }
  258 
  259 void
  260 agp_free_cdev(device_t dev)
  261 {
  262         struct agp_softc *sc = device_get_softc(dev);
  263 
  264         destroy_dev(sc->as_devnode);
  265 }
  266 
  267 void
  268 agp_free_res(device_t dev)
  269 {
  270         struct agp_softc *sc = device_get_softc(dev);
  271 
  272         if (sc->as_aperture != NULL)
  273                 bus_release_resource(dev, SYS_RES_MEMORY, sc->as_aperture_rid,
  274                     sc->as_aperture);
  275         mtx_destroy(&sc->as_lock);
  276 }
  277 
  278 int
  279 agp_generic_detach(device_t dev)
  280 {
  281 
  282         agp_free_cdev(dev);
  283         agp_free_res(dev);
  284         return 0;
  285 }
  286 
  287 /**
  288  * Default AGP aperture size detection which simply returns the size of
  289  * the aperture's PCI resource.
  290  */
  291 u_int32_t
  292 agp_generic_get_aperture(device_t dev)
  293 {
  294         struct agp_softc *sc = device_get_softc(dev);
  295 
  296         return rman_get_size(sc->as_aperture);
  297 }
  298 
  299 /**
  300  * Default AGP aperture size setting function, which simply doesn't allow
  301  * changes to resource size.
  302  */
  303 int
  304 agp_generic_set_aperture(device_t dev, u_int32_t aperture)
  305 {
  306         u_int32_t current_aperture;
  307 
  308         current_aperture = AGP_GET_APERTURE(dev);
  309         if (current_aperture != aperture)
  310                 return EINVAL;
  311         else
  312                 return 0;
  313 }
  314 
  315 /*
  316  * This does the enable logic for v3, with the same topology
  317  * restrictions as in place for v2 -- one bus, one device on the bus.
  318  */
  319 static int
  320 agp_v3_enable(device_t dev, device_t mdev, u_int32_t mode)
  321 {
  322         u_int32_t tstatus, mstatus;
  323         u_int32_t command;
  324         int rq, sba, fw, rate, arqsz, cal;
  325 
  326         tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  327         mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
  328 
  329         /* Set RQ to the min of mode, tstatus and mstatus */
  330         rq = AGP_MODE_GET_RQ(mode);
  331         if (AGP_MODE_GET_RQ(tstatus) < rq)
  332                 rq = AGP_MODE_GET_RQ(tstatus);
  333         if (AGP_MODE_GET_RQ(mstatus) < rq)
  334                 rq = AGP_MODE_GET_RQ(mstatus);
  335 
  336         /*
  337          * ARQSZ - Set the value to the maximum one.
  338          * Don't allow the mode register to override values.
  339          */
  340         arqsz = AGP_MODE_GET_ARQSZ(mode);
  341         if (AGP_MODE_GET_ARQSZ(tstatus) > rq)
  342                 rq = AGP_MODE_GET_ARQSZ(tstatus);
  343         if (AGP_MODE_GET_ARQSZ(mstatus) > rq)
  344                 rq = AGP_MODE_GET_ARQSZ(mstatus);
  345 
  346         /* Calibration cycle - don't allow override by mode register */
  347         cal = AGP_MODE_GET_CAL(tstatus);
  348         if (AGP_MODE_GET_CAL(mstatus) < cal)
  349                 cal = AGP_MODE_GET_CAL(mstatus);
  350 
  351         /* SBA must be supported for AGP v3. */
  352         sba = 1;
  353 
  354         /* Set FW if all three support it. */
  355         fw = (AGP_MODE_GET_FW(tstatus)
  356                & AGP_MODE_GET_FW(mstatus)
  357                & AGP_MODE_GET_FW(mode));
  358         
  359         /* Figure out the max rate */
  360         rate = (AGP_MODE_GET_RATE(tstatus)
  361                 & AGP_MODE_GET_RATE(mstatus)
  362                 & AGP_MODE_GET_RATE(mode));
  363         if (rate & AGP_MODE_V3_RATE_8x)
  364                 rate = AGP_MODE_V3_RATE_8x;
  365         else
  366                 rate = AGP_MODE_V3_RATE_4x;
  367         if (bootverbose)
  368                 device_printf(dev, "Setting AGP v3 mode %d\n", rate * 4);
  369 
  370         pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, 0, 4);
  371 
  372         /* Construct the new mode word and tell the hardware */
  373         command = 0;
  374         command = AGP_MODE_SET_RQ(0, rq);
  375         command = AGP_MODE_SET_ARQSZ(command, arqsz);
  376         command = AGP_MODE_SET_CAL(command, cal);
  377         command = AGP_MODE_SET_SBA(command, sba);
  378         command = AGP_MODE_SET_FW(command, fw);
  379         command = AGP_MODE_SET_RATE(command, rate);
  380         command = AGP_MODE_SET_MODE_3(command, 1);
  381         command = AGP_MODE_SET_AGP(command, 1);
  382         pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4);
  383         pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4);
  384 
  385         return 0;
  386 }
  387 
  388 static int
  389 agp_v2_enable(device_t dev, device_t mdev, u_int32_t mode)
  390 {
  391         u_int32_t tstatus, mstatus;
  392         u_int32_t command;
  393         int rq, sba, fw, rate;
  394 
  395         tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  396         mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
  397 
  398         /* Set RQ to the min of mode, tstatus and mstatus */
  399         rq = AGP_MODE_GET_RQ(mode);
  400         if (AGP_MODE_GET_RQ(tstatus) < rq)
  401                 rq = AGP_MODE_GET_RQ(tstatus);
  402         if (AGP_MODE_GET_RQ(mstatus) < rq)
  403                 rq = AGP_MODE_GET_RQ(mstatus);
  404 
  405         /* Set SBA if all three can deal with SBA */
  406         sba = (AGP_MODE_GET_SBA(tstatus)
  407                & AGP_MODE_GET_SBA(mstatus)
  408                & AGP_MODE_GET_SBA(mode));
  409 
  410         /* Similar for FW */
  411         fw = (AGP_MODE_GET_FW(tstatus)
  412                & AGP_MODE_GET_FW(mstatus)
  413                & AGP_MODE_GET_FW(mode));
  414 
  415         /* Figure out the max rate */
  416         rate = (AGP_MODE_GET_RATE(tstatus)
  417                 & AGP_MODE_GET_RATE(mstatus)
  418                 & AGP_MODE_GET_RATE(mode));
  419         if (rate & AGP_MODE_V2_RATE_4x)
  420                 rate = AGP_MODE_V2_RATE_4x;
  421         else if (rate & AGP_MODE_V2_RATE_2x)
  422                 rate = AGP_MODE_V2_RATE_2x;
  423         else
  424                 rate = AGP_MODE_V2_RATE_1x;
  425         if (bootverbose)
  426                 device_printf(dev, "Setting AGP v2 mode %d\n", rate);
  427 
  428         /* Construct the new mode word and tell the hardware */
  429         command = 0;
  430         command = AGP_MODE_SET_RQ(0, rq);
  431         command = AGP_MODE_SET_SBA(command, sba);
  432         command = AGP_MODE_SET_FW(command, fw);
  433         command = AGP_MODE_SET_RATE(command, rate);
  434         command = AGP_MODE_SET_AGP(command, 1);
  435         pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4);
  436         pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4);
  437 
  438         return 0;
  439 }
  440 
  441 int
  442 agp_generic_enable(device_t dev, u_int32_t mode)
  443 {
  444         device_t mdev = agp_find_display();
  445         u_int32_t tstatus, mstatus;
  446 
  447         if (!mdev) {
  448                 AGP_DPF("can't find display\n");
  449                 return ENXIO;
  450         }
  451 
  452         tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  453         mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
  454 
  455         /*
  456          * Check display and bridge for AGP v3 support.  AGP v3 allows
  457          * more variety in topology than v2, e.g. multiple AGP devices
  458          * attached to one bridge, or multiple AGP bridges in one
  459          * system.  This doesn't attempt to address those situations,
  460          * but should work fine for a classic single AGP slot system
  461          * with AGP v3.
  462          */
  463         if (AGP_MODE_GET_MODE_3(mode) &&
  464             AGP_MODE_GET_MODE_3(tstatus) &&
  465             AGP_MODE_GET_MODE_3(mstatus))
  466                 return (agp_v3_enable(dev, mdev, mode));
  467         else
  468                 return (agp_v2_enable(dev, mdev, mode));            
  469 }
  470 
  471 struct agp_memory *
  472 agp_generic_alloc_memory(device_t dev, int type, vm_size_t size)
  473 {
  474         struct agp_softc *sc = device_get_softc(dev);
  475         struct agp_memory *mem;
  476 
  477         if ((size & (AGP_PAGE_SIZE - 1)) != 0)
  478                 return 0;
  479 
  480         if (size > sc->as_maxmem - sc->as_allocated)
  481                 return 0;
  482 
  483         if (type != 0) {
  484                 printf("agp_generic_alloc_memory: unsupported type %d\n",
  485                        type);
  486                 return 0;
  487         }
  488 
  489         mem = malloc(sizeof *mem, M_AGP, M_WAITOK);
  490         mem->am_id = sc->as_nextid++;
  491         mem->am_size = size;
  492         mem->am_type = 0;
  493         mem->am_obj = vm_object_allocate(OBJT_DEFAULT, atop(round_page(size)));
  494         mem->am_physical = 0;
  495         mem->am_offset = 0;
  496         mem->am_is_bound = 0;
  497         TAILQ_INSERT_TAIL(&sc->as_memory, mem, am_link);
  498         sc->as_allocated += size;
  499 
  500         return mem;
  501 }
  502 
  503 int
  504 agp_generic_free_memory(device_t dev, struct agp_memory *mem)
  505 {
  506         struct agp_softc *sc = device_get_softc(dev);
  507 
  508         if (mem->am_is_bound)
  509                 return EBUSY;
  510 
  511         sc->as_allocated -= mem->am_size;
  512         TAILQ_REMOVE(&sc->as_memory, mem, am_link);
  513         vm_object_deallocate(mem->am_obj);
  514         free(mem, M_AGP);
  515         return 0;
  516 }
  517 
  518 int
  519 agp_generic_bind_memory(device_t dev, struct agp_memory *mem,
  520                         vm_offset_t offset)
  521 {
  522         struct agp_softc *sc = device_get_softc(dev);
  523         vm_offset_t i, j, k;
  524         vm_page_t m;
  525         int error;
  526 
  527         /* Do some sanity checks first. */
  528         if ((offset & (AGP_PAGE_SIZE - 1)) != 0 ||
  529             offset + mem->am_size > AGP_GET_APERTURE(dev)) {
  530                 device_printf(dev, "binding memory at bad offset %#x\n",
  531                     (int)offset);
  532                 return EINVAL;
  533         }
  534 
  535         /*
  536          * Allocate the pages early, before acquiring the lock,
  537          * because vm_page_grab() may sleep and we can't hold a mutex
  538          * while sleeping.
  539          */
  540         VM_OBJECT_WLOCK(mem->am_obj);
  541         for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
  542                 /*
  543                  * Find a page from the object and wire it
  544                  * down. This page will be mapped using one or more
  545                  * entries in the GATT (assuming that PAGE_SIZE >=
  546                  * AGP_PAGE_SIZE. If this is the first call to bind,
  547                  * the pages will be allocated and zeroed.
  548                  */
  549                 m = vm_page_grab(mem->am_obj, OFF_TO_IDX(i),
  550                     VM_ALLOC_WIRED | VM_ALLOC_ZERO);
  551                 AGP_DPF("found page pa=%#jx\n", (uintmax_t)VM_PAGE_TO_PHYS(m));
  552         }
  553         VM_OBJECT_WUNLOCK(mem->am_obj);
  554 
  555         mtx_lock(&sc->as_lock);
  556 
  557         if (mem->am_is_bound) {
  558                 device_printf(dev, "memory already bound\n");
  559                 error = EINVAL;
  560                 VM_OBJECT_WLOCK(mem->am_obj);
  561                 i = 0;
  562                 goto bad;
  563         }
  564         
  565         /*
  566          * Bind the individual pages and flush the chipset's
  567          * TLB.
  568          */
  569         VM_OBJECT_WLOCK(mem->am_obj);
  570         for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
  571                 m = vm_page_lookup(mem->am_obj, OFF_TO_IDX(i));
  572 
  573                 /*
  574                  * Install entries in the GATT, making sure that if
  575                  * AGP_PAGE_SIZE < PAGE_SIZE and mem->am_size is not
  576                  * aligned to PAGE_SIZE, we don't modify too many GATT 
  577                  * entries.
  578                  */
  579                 for (j = 0; j < PAGE_SIZE && i + j < mem->am_size;
  580                      j += AGP_PAGE_SIZE) {
  581                         vm_offset_t pa = VM_PAGE_TO_PHYS(m) + j;
  582                         AGP_DPF("binding offset %#jx to pa %#jx\n",
  583                                 (uintmax_t)offset + i + j, (uintmax_t)pa);
  584                         error = AGP_BIND_PAGE(dev, offset + i + j, pa);
  585                         if (error) {
  586                                 /*
  587                                  * Bail out. Reverse all the mappings
  588                                  * and unwire the pages.
  589                                  */
  590                                 for (k = 0; k < i + j; k += AGP_PAGE_SIZE)
  591                                         AGP_UNBIND_PAGE(dev, offset + k);
  592                                 goto bad;
  593                         }
  594                 }
  595                 vm_page_xunbusy(m);
  596         }
  597         VM_OBJECT_WUNLOCK(mem->am_obj);
  598 
  599         /*
  600          * Make sure the chipset gets the new mappings.
  601          */
  602         AGP_FLUSH_TLB(dev);
  603 
  604         mem->am_offset = offset;
  605         mem->am_is_bound = 1;
  606 
  607         mtx_unlock(&sc->as_lock);
  608 
  609         return 0;
  610 bad:
  611         mtx_unlock(&sc->as_lock);
  612         VM_OBJECT_ASSERT_WLOCKED(mem->am_obj);
  613         for (k = 0; k < mem->am_size; k += PAGE_SIZE) {
  614                 m = vm_page_lookup(mem->am_obj, OFF_TO_IDX(k));
  615                 if (k >= i)
  616                         vm_page_xunbusy(m);
  617                 vm_page_lock(m);
  618                 vm_page_unwire(m, PQ_INACTIVE);
  619                 vm_page_unlock(m);
  620         }
  621         VM_OBJECT_WUNLOCK(mem->am_obj);
  622 
  623         return error;
  624 }
  625 
  626 int
  627 agp_generic_unbind_memory(device_t dev, struct agp_memory *mem)
  628 {
  629         struct agp_softc *sc = device_get_softc(dev);
  630         vm_page_t m;
  631         int i;
  632 
  633         mtx_lock(&sc->as_lock);
  634 
  635         if (!mem->am_is_bound) {
  636                 device_printf(dev, "memory is not bound\n");
  637                 mtx_unlock(&sc->as_lock);
  638                 return EINVAL;
  639         }
  640 
  641 
  642         /*
  643          * Unbind the individual pages and flush the chipset's
  644          * TLB. Unwire the pages so they can be swapped.
  645          */
  646         for (i = 0; i < mem->am_size; i += AGP_PAGE_SIZE)
  647                 AGP_UNBIND_PAGE(dev, mem->am_offset + i);
  648 
  649         AGP_FLUSH_TLB(dev);
  650 
  651         VM_OBJECT_WLOCK(mem->am_obj);
  652         for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
  653                 m = vm_page_lookup(mem->am_obj, atop(i));
  654                 vm_page_lock(m);
  655                 vm_page_unwire(m, PQ_INACTIVE);
  656                 vm_page_unlock(m);
  657         }
  658         VM_OBJECT_WUNLOCK(mem->am_obj);
  659 
  660         mem->am_offset = 0;
  661         mem->am_is_bound = 0;
  662 
  663         mtx_unlock(&sc->as_lock);
  664 
  665         return 0;
  666 }
  667 
  668 /* Helper functions for implementing user/kernel api */
  669 
  670 static int
  671 agp_acquire_helper(device_t dev, enum agp_acquire_state state)
  672 {
  673         struct agp_softc *sc = device_get_softc(dev);
  674 
  675         if (sc->as_state != AGP_ACQUIRE_FREE)
  676                 return EBUSY;
  677         sc->as_state = state;
  678 
  679         return 0;
  680 }
  681 
  682 static int
  683 agp_release_helper(device_t dev, enum agp_acquire_state state)
  684 {
  685         struct agp_softc *sc = device_get_softc(dev);
  686 
  687         if (sc->as_state == AGP_ACQUIRE_FREE)
  688                 return 0;
  689 
  690         if (sc->as_state != state)
  691                 return EBUSY;
  692 
  693         sc->as_state = AGP_ACQUIRE_FREE;
  694         return 0;
  695 }
  696 
  697 static struct agp_memory *
  698 agp_find_memory(device_t dev, int id)
  699 {
  700         struct agp_softc *sc = device_get_softc(dev);
  701         struct agp_memory *mem;
  702 
  703         AGP_DPF("searching for memory block %d\n", id);
  704         TAILQ_FOREACH(mem, &sc->as_memory, am_link) {
  705                 AGP_DPF("considering memory block %d\n", mem->am_id);
  706                 if (mem->am_id == id)
  707                         return mem;
  708         }
  709         return 0;
  710 }
  711 
  712 /* Implementation of the userland ioctl api */
  713 
  714 static int
  715 agp_info_user(device_t dev, agp_info *info)
  716 {
  717         struct agp_softc *sc = device_get_softc(dev);
  718 
  719         bzero(info, sizeof *info);
  720         info->bridge_id = pci_get_devid(dev);
  721         info->agp_mode = 
  722             pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  723         if (sc->as_aperture)
  724                 info->aper_base = rman_get_start(sc->as_aperture);
  725         else
  726                 info->aper_base = 0;
  727         info->aper_size = AGP_GET_APERTURE(dev) >> 20;
  728         info->pg_total = info->pg_system = sc->as_maxmem >> AGP_PAGE_SHIFT;
  729         info->pg_used = sc->as_allocated >> AGP_PAGE_SHIFT;
  730 
  731         return 0;
  732 }
  733 
  734 static int
  735 agp_setup_user(device_t dev, agp_setup *setup)
  736 {
  737         return AGP_ENABLE(dev, setup->agp_mode);
  738 }
  739 
  740 static int
  741 agp_allocate_user(device_t dev, agp_allocate *alloc)
  742 {
  743         struct agp_memory *mem;
  744 
  745         mem = AGP_ALLOC_MEMORY(dev,
  746                                alloc->type,
  747                                alloc->pg_count << AGP_PAGE_SHIFT);
  748         if (mem) {
  749                 alloc->key = mem->am_id;
  750                 alloc->physical = mem->am_physical;
  751                 return 0;
  752         } else {
  753                 return ENOMEM;
  754         }
  755 }
  756 
  757 static int
  758 agp_deallocate_user(device_t dev, int id)
  759 {
  760         struct agp_memory *mem = agp_find_memory(dev, id);
  761 
  762         if (mem) {
  763                 AGP_FREE_MEMORY(dev, mem);
  764                 return 0;
  765         } else {
  766                 return ENOENT;
  767         }
  768 }
  769 
  770 static int
  771 agp_bind_user(device_t dev, agp_bind *bind)
  772 {
  773         struct agp_memory *mem = agp_find_memory(dev, bind->key);
  774 
  775         if (!mem)
  776                 return ENOENT;
  777 
  778         return AGP_BIND_MEMORY(dev, mem, bind->pg_start << AGP_PAGE_SHIFT);
  779 }
  780 
  781 static int
  782 agp_unbind_user(device_t dev, agp_unbind *unbind)
  783 {
  784         struct agp_memory *mem = agp_find_memory(dev, unbind->key);
  785 
  786         if (!mem)
  787                 return ENOENT;
  788 
  789         return AGP_UNBIND_MEMORY(dev, mem);
  790 }
  791 
  792 static int
  793 agp_chipset_flush(device_t dev)
  794 {
  795 
  796         return (AGP_CHIPSET_FLUSH(dev));
  797 }
  798 
  799 static int
  800 agp_open(struct cdev *kdev, int oflags, int devtype, struct thread *td)
  801 {
  802         device_t dev = kdev->si_drv1;
  803         struct agp_softc *sc = device_get_softc(dev);
  804 
  805         if (!sc->as_isopen) {
  806                 sc->as_isopen = 1;
  807                 device_busy(dev);
  808         }
  809 
  810         return 0;
  811 }
  812 
  813 static int
  814 agp_close(struct cdev *kdev, int fflag, int devtype, struct thread *td)
  815 {
  816         device_t dev = kdev->si_drv1;
  817         struct agp_softc *sc = device_get_softc(dev);
  818         struct agp_memory *mem;
  819 
  820         /*
  821          * Clear the GATT and force release on last close
  822          */
  823         while ((mem = TAILQ_FIRST(&sc->as_memory)) != NULL) {
  824                 if (mem->am_is_bound)
  825                         AGP_UNBIND_MEMORY(dev, mem);
  826                 AGP_FREE_MEMORY(dev, mem);
  827         }
  828         if (sc->as_state == AGP_ACQUIRE_USER)
  829                 agp_release_helper(dev, AGP_ACQUIRE_USER);
  830         sc->as_isopen = 0;
  831         device_unbusy(dev);
  832 
  833         return 0;
  834 }
  835 
  836 static int
  837 agp_ioctl(struct cdev *kdev, u_long cmd, caddr_t data, int fflag, struct thread *td)
  838 {
  839         device_t dev = kdev->si_drv1;
  840 
  841         switch (cmd) {
  842         case AGPIOC_INFO:
  843                 return agp_info_user(dev, (agp_info *) data);
  844 
  845         case AGPIOC_ACQUIRE:
  846                 return agp_acquire_helper(dev, AGP_ACQUIRE_USER);
  847 
  848         case AGPIOC_RELEASE:
  849                 return agp_release_helper(dev, AGP_ACQUIRE_USER);
  850 
  851         case AGPIOC_SETUP:
  852                 return agp_setup_user(dev, (agp_setup *)data);
  853 
  854         case AGPIOC_ALLOCATE:
  855                 return agp_allocate_user(dev, (agp_allocate *)data);
  856 
  857         case AGPIOC_DEALLOCATE:
  858                 return agp_deallocate_user(dev, *(int *) data);
  859 
  860         case AGPIOC_BIND:
  861                 return agp_bind_user(dev, (agp_bind *)data);
  862 
  863         case AGPIOC_UNBIND:
  864                 return agp_unbind_user(dev, (agp_unbind *)data);
  865 
  866         case AGPIOC_CHIPSET_FLUSH:
  867                 return agp_chipset_flush(dev);
  868         }
  869 
  870         return EINVAL;
  871 }
  872 
  873 static int
  874 agp_mmap(struct cdev *kdev, vm_ooffset_t offset, vm_paddr_t *paddr,
  875     int prot, vm_memattr_t *memattr)
  876 {
  877         device_t dev = kdev->si_drv1;
  878         struct agp_softc *sc = device_get_softc(dev);
  879 
  880         if (offset > AGP_GET_APERTURE(dev))
  881                 return -1;
  882         if (sc->as_aperture == NULL)
  883                 return -1;
  884         *paddr = rman_get_start(sc->as_aperture) + offset;
  885         return 0;
  886 }
  887 
  888 /* Implementation of the kernel api */
  889 
  890 device_t
  891 agp_find_device()
  892 {
  893         device_t *children, child;
  894         int i, count;
  895 
  896         if (!agp_devclass)
  897                 return NULL;
  898         if (devclass_get_devices(agp_devclass, &children, &count) != 0)
  899                 return NULL;
  900         child = NULL;
  901         for (i = 0; i < count; i++) {
  902                 if (device_is_attached(children[i])) {
  903                         child = children[i];
  904                         break;
  905                 }
  906         }
  907         free(children, M_TEMP);
  908         return child;
  909 }
  910 
  911 enum agp_acquire_state
  912 agp_state(device_t dev)
  913 {
  914         struct agp_softc *sc = device_get_softc(dev);
  915         return sc->as_state;
  916 }
  917 
  918 void
  919 agp_get_info(device_t dev, struct agp_info *info)
  920 {
  921         struct agp_softc *sc = device_get_softc(dev);
  922 
  923         info->ai_mode =
  924                 pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  925         if (sc->as_aperture != NULL)
  926                 info->ai_aperture_base = rman_get_start(sc->as_aperture);
  927         else
  928                 info->ai_aperture_base = 0;
  929         info->ai_aperture_size = AGP_GET_APERTURE(dev);
  930         info->ai_memory_allowed = sc->as_maxmem;
  931         info->ai_memory_used = sc->as_allocated;
  932 }
  933 
  934 int
  935 agp_acquire(device_t dev)
  936 {
  937         return agp_acquire_helper(dev, AGP_ACQUIRE_KERNEL);
  938 }
  939 
  940 int
  941 agp_release(device_t dev)
  942 {
  943         return agp_release_helper(dev, AGP_ACQUIRE_KERNEL);
  944 }
  945 
  946 int
  947 agp_enable(device_t dev, u_int32_t mode)
  948 {
  949         return AGP_ENABLE(dev, mode);
  950 }
  951 
  952 void *agp_alloc_memory(device_t dev, int type, vm_size_t bytes)
  953 {
  954         return  (void *) AGP_ALLOC_MEMORY(dev, type, bytes);
  955 }
  956 
  957 void agp_free_memory(device_t dev, void *handle)
  958 {
  959         struct agp_memory *mem = (struct agp_memory *) handle;
  960         AGP_FREE_MEMORY(dev, mem);
  961 }
  962 
  963 int agp_bind_memory(device_t dev, void *handle, vm_offset_t offset)
  964 {
  965         struct agp_memory *mem = (struct agp_memory *) handle;
  966         return AGP_BIND_MEMORY(dev, mem, offset);
  967 }
  968 
  969 int agp_unbind_memory(device_t dev, void *handle)
  970 {
  971         struct agp_memory *mem = (struct agp_memory *) handle;
  972         return AGP_UNBIND_MEMORY(dev, mem);
  973 }
  974 
  975 void agp_memory_info(device_t dev, void *handle, struct
  976                      agp_memory_info *mi)
  977 {
  978         struct agp_memory *mem = (struct agp_memory *) handle;
  979 
  980         mi->ami_size = mem->am_size;
  981         mi->ami_physical = mem->am_physical;
  982         mi->ami_offset = mem->am_offset;
  983         mi->ami_is_bound = mem->am_is_bound;
  984 }
  985 
  986 int
  987 agp_bind_pages(device_t dev, vm_page_t *pages, vm_size_t size,
  988     vm_offset_t offset)
  989 {
  990         struct agp_softc *sc;
  991         vm_offset_t i, j, k, pa;
  992         vm_page_t m;
  993         int error;
  994 
  995         if ((size & (AGP_PAGE_SIZE - 1)) != 0 ||
  996             (offset & (AGP_PAGE_SIZE - 1)) != 0)
  997                 return (EINVAL);
  998 
  999         sc = device_get_softc(dev);
 1000 
 1001         mtx_lock(&sc->as_lock);
 1002         for (i = 0; i < size; i += PAGE_SIZE) {
 1003                 m = pages[OFF_TO_IDX(i)];
 1004                 KASSERT(m->wire_count > 0,
 1005                     ("agp_bind_pages: page %p hasn't been wired", m));
 1006 
 1007                 /*
 1008                  * Install entries in the GATT, making sure that if
 1009                  * AGP_PAGE_SIZE < PAGE_SIZE and size is not
 1010                  * aligned to PAGE_SIZE, we don't modify too many GATT 
 1011                  * entries.
 1012                  */
 1013                 for (j = 0; j < PAGE_SIZE && i + j < size; j += AGP_PAGE_SIZE) {
 1014                         pa = VM_PAGE_TO_PHYS(m) + j;
 1015                         AGP_DPF("binding offset %#jx to pa %#jx\n",
 1016                                 (uintmax_t)offset + i + j, (uintmax_t)pa);
 1017                         error = AGP_BIND_PAGE(dev, offset + i + j, pa);
 1018                         if (error) {
 1019                                 /*
 1020                                  * Bail out. Reverse all the mappings.
 1021                                  */
 1022                                 for (k = 0; k < i + j; k += AGP_PAGE_SIZE)
 1023                                         AGP_UNBIND_PAGE(dev, offset + k);
 1024 
 1025                                 mtx_unlock(&sc->as_lock);
 1026                                 return (error);
 1027                         }
 1028                 }
 1029         }
 1030 
 1031         AGP_FLUSH_TLB(dev);
 1032 
 1033         mtx_unlock(&sc->as_lock);
 1034         return (0);
 1035 }
 1036 
 1037 int
 1038 agp_unbind_pages(device_t dev, vm_size_t size, vm_offset_t offset)
 1039 {
 1040         struct agp_softc *sc;
 1041         vm_offset_t i;
 1042 
 1043         if ((size & (AGP_PAGE_SIZE - 1)) != 0 ||
 1044             (offset & (AGP_PAGE_SIZE - 1)) != 0)
 1045                 return (EINVAL);
 1046 
 1047         sc = device_get_softc(dev);
 1048 
 1049         mtx_lock(&sc->as_lock);
 1050         for (i = 0; i < size; i += AGP_PAGE_SIZE)
 1051                 AGP_UNBIND_PAGE(dev, offset + i);
 1052 
 1053         AGP_FLUSH_TLB(dev);
 1054 
 1055         mtx_unlock(&sc->as_lock);
 1056         return (0);
 1057 }

Cache object: f7393e714f14af259476f72b281fa307


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