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  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2000 Doug Rabson
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include "opt_agp.h"
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/malloc.h>
   37 #include <sys/kernel.h>
   38 #include <sys/module.h>
   39 #include <sys/bus.h>
   40 #include <sys/conf.h>
   41 #include <sys/ioccom.h>
   42 #include <sys/agpio.h>
   43 #include <sys/lock.h>
   44 #include <sys/mutex.h>
   45 #include <sys/proc.h>
   46 #include <sys/rwlock.h>
   47 
   48 #include <dev/agp/agppriv.h>
   49 #include <dev/agp/agpvar.h>
   50 #include <dev/agp/agpreg.h>
   51 #include <dev/pci/pcivar.h>
   52 #include <dev/pci/pcireg.h>
   53 
   54 #include <vm/vm.h>
   55 #include <vm/vm_extern.h>
   56 #include <vm/vm_kern.h>
   57 #include <vm/vm_param.h>
   58 #include <vm/vm_object.h>
   59 #include <vm/vm_page.h>
   60 #include <vm/vm_pageout.h>
   61 #include <vm/pmap.h>
   62 
   63 #include <machine/bus.h>
   64 #include <machine/resource.h>
   65 #include <sys/rman.h>
   66 
   67 MODULE_VERSION(agp, 1);
   68 
   69 MALLOC_DEFINE(M_AGP, "agp", "AGP data structures");
   70 
   71                                 /* agp_drv.c */
   72 static d_open_t agp_open;
   73 static d_close_t agp_close;
   74 static d_ioctl_t agp_ioctl;
   75 static d_mmap_t agp_mmap;
   76 
   77 static struct cdevsw agp_cdevsw = {
   78         .d_version =    D_VERSION,
   79         .d_flags =      D_NEEDGIANT,
   80         .d_open =       agp_open,
   81         .d_close =      agp_close,
   82         .d_ioctl =      agp_ioctl,
   83         .d_mmap =       agp_mmap,
   84         .d_name =       "agp",
   85 };
   86 
   87 static devclass_t agp_devclass;
   88 
   89 /* Helper functions for implementing chipset mini drivers. */
   90 
   91 u_int8_t
   92 agp_find_caps(device_t dev)
   93 {
   94         int capreg;
   95 
   96         if (pci_find_cap(dev, PCIY_AGP, &capreg) != 0)
   97                 capreg = 0;
   98         return (capreg);
   99 }
  100 
  101 /*
  102  * Find an AGP display device (if any).
  103  */
  104 static device_t
  105 agp_find_display(void)
  106 {
  107         devclass_t pci = devclass_find("pci");
  108         device_t bus, dev = 0;
  109         device_t *kids;
  110         int busnum, numkids, i;
  111 
  112         for (busnum = 0; busnum < devclass_get_maxunit(pci); busnum++) {
  113                 bus = devclass_get_device(pci, busnum);
  114                 if (!bus)
  115                         continue;
  116                 if (device_get_children(bus, &kids, &numkids) != 0)
  117                         continue;
  118                 for (i = 0; i < numkids; i++) {
  119                         dev = kids[i];
  120                         if (pci_get_class(dev) == PCIC_DISPLAY
  121                             && pci_get_subclass(dev) == PCIS_DISPLAY_VGA)
  122                                 if (agp_find_caps(dev)) {
  123                                         free(kids, M_TEMP);
  124                                         return dev;
  125                                 }
  126                                         
  127                 }
  128                 free(kids, M_TEMP);
  129         }
  130 
  131         return 0;
  132 }
  133 
  134 struct agp_gatt *
  135 agp_alloc_gatt(device_t dev)
  136 {
  137         u_int32_t apsize = AGP_GET_APERTURE(dev);
  138         u_int32_t entries = apsize >> AGP_PAGE_SHIFT;
  139         struct agp_gatt *gatt;
  140 
  141         if (bootverbose)
  142                 device_printf(dev,
  143                               "allocating GATT for aperture of size %dM\n",
  144                               apsize / (1024*1024));
  145 
  146         if (entries == 0) {
  147                 device_printf(dev, "bad aperture size\n");
  148                 return NULL;
  149         }
  150 
  151         gatt = malloc(sizeof(struct agp_gatt), M_AGP, M_NOWAIT);
  152         if (!gatt)
  153                 return 0;
  154 
  155         gatt->ag_entries = entries;
  156         gatt->ag_virtual = (void *)kmem_alloc_contig(entries *
  157             sizeof(u_int32_t), M_NOWAIT | M_ZERO, 0, ~0, PAGE_SIZE, 0,
  158             VM_MEMATTR_WRITE_COMBINING);
  159         if (!gatt->ag_virtual) {
  160                 if (bootverbose)
  161                         device_printf(dev, "contiguous allocation failed\n");
  162                 free(gatt, M_AGP);
  163                 return 0;
  164         }
  165         gatt->ag_physical = vtophys((vm_offset_t) gatt->ag_virtual);
  166 
  167         return gatt;
  168 }
  169 
  170 void
  171 agp_free_gatt(struct agp_gatt *gatt)
  172 {
  173         kmem_free((vm_offset_t)gatt->ag_virtual, gatt->ag_entries *
  174             sizeof(u_int32_t));
  175         free(gatt, M_AGP);
  176 }
  177 
  178 static u_int agp_max[][2] = {
  179         {0,     0},
  180         {32,    4},
  181         {64,    28},
  182         {128,   96},
  183         {256,   204},
  184         {512,   440},
  185         {1024,  942},
  186         {2048,  1920},
  187         {4096,  3932}
  188 };
  189 #define AGP_MAX_SIZE    nitems(agp_max)
  190 
  191 /**
  192  * Sets the PCI resource which represents the AGP aperture.
  193  *
  194  * If not called, the default AGP aperture resource of AGP_APBASE will
  195  * be used.  Must be called before agp_generic_attach().
  196  */
  197 void
  198 agp_set_aperture_resource(device_t dev, int rid)
  199 {
  200         struct agp_softc *sc = device_get_softc(dev);
  201 
  202         sc->as_aperture_rid = rid;
  203 }
  204 
  205 int
  206 agp_generic_attach(device_t dev)
  207 {
  208         struct agp_softc *sc = device_get_softc(dev);
  209         int i;
  210         u_int memsize;
  211 
  212         /*
  213          * Find and map the aperture, RF_SHAREABLE for DRM but not RF_ACTIVE
  214          * because the kernel doesn't need to map it.
  215          */
  216 
  217         if (sc->as_aperture_rid != -1) {
  218                 if (sc->as_aperture_rid == 0)
  219                         sc->as_aperture_rid = AGP_APBASE;
  220 
  221                 sc->as_aperture = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
  222                     &sc->as_aperture_rid, RF_SHAREABLE);
  223                 if (!sc->as_aperture)
  224                         return ENOMEM;
  225         }
  226 
  227         /*
  228          * Work out an upper bound for agp memory allocation. This
  229          * uses a heurisitc table from the Linux driver.
  230          */
  231         memsize = ptoa(realmem) >> 20;
  232         for (i = 0; i < AGP_MAX_SIZE; i++) {
  233                 if (memsize <= agp_max[i][0])
  234                         break;
  235         }
  236         if (i == AGP_MAX_SIZE)
  237                 i = AGP_MAX_SIZE - 1;
  238         sc->as_maxmem = agp_max[i][1] << 20U;
  239 
  240         /*
  241          * The lock is used to prevent re-entry to
  242          * agp_generic_bind_memory() since that function can sleep.
  243          */
  244         mtx_init(&sc->as_lock, "agp lock", NULL, MTX_DEF);
  245 
  246         /*
  247          * Initialise stuff for the userland device.
  248          */
  249         agp_devclass = devclass_find("agp");
  250         TAILQ_INIT(&sc->as_memory);
  251         sc->as_nextid = 1;
  252 
  253         sc->as_devnode = make_dev(&agp_cdevsw,
  254             0, UID_ROOT, GID_WHEEL, 0600, "agpgart");
  255         sc->as_devnode->si_drv1 = dev;
  256 
  257         return 0;
  258 }
  259 
  260 void
  261 agp_free_cdev(device_t dev)
  262 {
  263         struct agp_softc *sc = device_get_softc(dev);
  264 
  265         destroy_dev(sc->as_devnode);
  266 }
  267 
  268 void
  269 agp_free_res(device_t dev)
  270 {
  271         struct agp_softc *sc = device_get_softc(dev);
  272 
  273         if (sc->as_aperture != NULL)
  274                 bus_release_resource(dev, SYS_RES_MEMORY, sc->as_aperture_rid,
  275                     sc->as_aperture);
  276         mtx_destroy(&sc->as_lock);
  277 }
  278 
  279 int
  280 agp_generic_detach(device_t dev)
  281 {
  282 
  283         agp_free_cdev(dev);
  284         agp_free_res(dev);
  285         return 0;
  286 }
  287 
  288 /**
  289  * Default AGP aperture size detection which simply returns the size of
  290  * the aperture's PCI resource.
  291  */
  292 u_int32_t
  293 agp_generic_get_aperture(device_t dev)
  294 {
  295         struct agp_softc *sc = device_get_softc(dev);
  296 
  297         return rman_get_size(sc->as_aperture);
  298 }
  299 
  300 /**
  301  * Default AGP aperture size setting function, which simply doesn't allow
  302  * changes to resource size.
  303  */
  304 int
  305 agp_generic_set_aperture(device_t dev, u_int32_t aperture)
  306 {
  307         u_int32_t current_aperture;
  308 
  309         current_aperture = AGP_GET_APERTURE(dev);
  310         if (current_aperture != aperture)
  311                 return EINVAL;
  312         else
  313                 return 0;
  314 }
  315 
  316 /*
  317  * This does the enable logic for v3, with the same topology
  318  * restrictions as in place for v2 -- one bus, one device on the bus.
  319  */
  320 static int
  321 agp_v3_enable(device_t dev, device_t mdev, u_int32_t mode)
  322 {
  323         u_int32_t tstatus, mstatus;
  324         u_int32_t command;
  325         int rq, sba, fw, rate, arqsz, cal;
  326 
  327         tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  328         mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
  329 
  330         /* Set RQ to the min of mode, tstatus and mstatus */
  331         rq = AGP_MODE_GET_RQ(mode);
  332         if (AGP_MODE_GET_RQ(tstatus) < rq)
  333                 rq = AGP_MODE_GET_RQ(tstatus);
  334         if (AGP_MODE_GET_RQ(mstatus) < rq)
  335                 rq = AGP_MODE_GET_RQ(mstatus);
  336 
  337         /*
  338          * ARQSZ - Set the value to the maximum one.
  339          * Don't allow the mode register to override values.
  340          */
  341         arqsz = AGP_MODE_GET_ARQSZ(mode);
  342         if (AGP_MODE_GET_ARQSZ(tstatus) > rq)
  343                 rq = AGP_MODE_GET_ARQSZ(tstatus);
  344         if (AGP_MODE_GET_ARQSZ(mstatus) > rq)
  345                 rq = AGP_MODE_GET_ARQSZ(mstatus);
  346 
  347         /* Calibration cycle - don't allow override by mode register */
  348         cal = AGP_MODE_GET_CAL(tstatus);
  349         if (AGP_MODE_GET_CAL(mstatus) < cal)
  350                 cal = AGP_MODE_GET_CAL(mstatus);
  351 
  352         /* SBA must be supported for AGP v3. */
  353         sba = 1;
  354 
  355         /* Set FW if all three support it. */
  356         fw = (AGP_MODE_GET_FW(tstatus)
  357                & AGP_MODE_GET_FW(mstatus)
  358                & AGP_MODE_GET_FW(mode));
  359 
  360         /* Figure out the max rate */
  361         rate = (AGP_MODE_GET_RATE(tstatus)
  362                 & AGP_MODE_GET_RATE(mstatus)
  363                 & AGP_MODE_GET_RATE(mode));
  364         if (rate & AGP_MODE_V3_RATE_8x)
  365                 rate = AGP_MODE_V3_RATE_8x;
  366         else
  367                 rate = AGP_MODE_V3_RATE_4x;
  368         if (bootverbose)
  369                 device_printf(dev, "Setting AGP v3 mode %d\n", rate * 4);
  370 
  371         pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, 0, 4);
  372 
  373         /* Construct the new mode word and tell the hardware */
  374         command = 0;
  375         command = AGP_MODE_SET_RQ(0, rq);
  376         command = AGP_MODE_SET_ARQSZ(command, arqsz);
  377         command = AGP_MODE_SET_CAL(command, cal);
  378         command = AGP_MODE_SET_SBA(command, sba);
  379         command = AGP_MODE_SET_FW(command, fw);
  380         command = AGP_MODE_SET_RATE(command, rate);
  381         command = AGP_MODE_SET_MODE_3(command, 1);
  382         command = AGP_MODE_SET_AGP(command, 1);
  383         pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4);
  384         pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4);
  385 
  386         return 0;
  387 }
  388 
  389 static int
  390 agp_v2_enable(device_t dev, device_t mdev, u_int32_t mode)
  391 {
  392         u_int32_t tstatus, mstatus;
  393         u_int32_t command;
  394         int rq, sba, fw, rate;
  395 
  396         tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  397         mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
  398 
  399         /* Set RQ to the min of mode, tstatus and mstatus */
  400         rq = AGP_MODE_GET_RQ(mode);
  401         if (AGP_MODE_GET_RQ(tstatus) < rq)
  402                 rq = AGP_MODE_GET_RQ(tstatus);
  403         if (AGP_MODE_GET_RQ(mstatus) < rq)
  404                 rq = AGP_MODE_GET_RQ(mstatus);
  405 
  406         /* Set SBA if all three can deal with SBA */
  407         sba = (AGP_MODE_GET_SBA(tstatus)
  408                & AGP_MODE_GET_SBA(mstatus)
  409                & AGP_MODE_GET_SBA(mode));
  410 
  411         /* Similar for FW */
  412         fw = (AGP_MODE_GET_FW(tstatus)
  413                & AGP_MODE_GET_FW(mstatus)
  414                & AGP_MODE_GET_FW(mode));
  415 
  416         /* Figure out the max rate */
  417         rate = (AGP_MODE_GET_RATE(tstatus)
  418                 & AGP_MODE_GET_RATE(mstatus)
  419                 & AGP_MODE_GET_RATE(mode));
  420         if (rate & AGP_MODE_V2_RATE_4x)
  421                 rate = AGP_MODE_V2_RATE_4x;
  422         else if (rate & AGP_MODE_V2_RATE_2x)
  423                 rate = AGP_MODE_V2_RATE_2x;
  424         else
  425                 rate = AGP_MODE_V2_RATE_1x;
  426         if (bootverbose)
  427                 device_printf(dev, "Setting AGP v2 mode %d\n", rate);
  428 
  429         /* Construct the new mode word and tell the hardware */
  430         command = 0;
  431         command = AGP_MODE_SET_RQ(0, rq);
  432         command = AGP_MODE_SET_SBA(command, sba);
  433         command = AGP_MODE_SET_FW(command, fw);
  434         command = AGP_MODE_SET_RATE(command, rate);
  435         command = AGP_MODE_SET_AGP(command, 1);
  436         pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4);
  437         pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4);
  438 
  439         return 0;
  440 }
  441 
  442 int
  443 agp_generic_enable(device_t dev, u_int32_t mode)
  444 {
  445         device_t mdev = agp_find_display();
  446         u_int32_t tstatus, mstatus;
  447 
  448         if (!mdev) {
  449                 AGP_DPF("can't find display\n");
  450                 return ENXIO;
  451         }
  452 
  453         tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  454         mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
  455 
  456         /*
  457          * Check display and bridge for AGP v3 support.  AGP v3 allows
  458          * more variety in topology than v2, e.g. multiple AGP devices
  459          * attached to one bridge, or multiple AGP bridges in one
  460          * system.  This doesn't attempt to address those situations,
  461          * but should work fine for a classic single AGP slot system
  462          * with AGP v3.
  463          */
  464         if (AGP_MODE_GET_MODE_3(mode) &&
  465             AGP_MODE_GET_MODE_3(tstatus) &&
  466             AGP_MODE_GET_MODE_3(mstatus))
  467                 return (agp_v3_enable(dev, mdev, mode));
  468         else
  469                 return (agp_v2_enable(dev, mdev, mode));            
  470 }
  471 
  472 struct agp_memory *
  473 agp_generic_alloc_memory(device_t dev, int type, vm_size_t size)
  474 {
  475         struct agp_softc *sc = device_get_softc(dev);
  476         struct agp_memory *mem;
  477 
  478         if ((size & (AGP_PAGE_SIZE - 1)) != 0)
  479                 return 0;
  480 
  481         if (size > sc->as_maxmem - sc->as_allocated)
  482                 return 0;
  483 
  484         if (type != 0) {
  485                 printf("agp_generic_alloc_memory: unsupported type %d\n",
  486                        type);
  487                 return 0;
  488         }
  489 
  490         mem = malloc(sizeof *mem, M_AGP, M_WAITOK);
  491         mem->am_id = sc->as_nextid++;
  492         mem->am_size = size;
  493         mem->am_type = 0;
  494         mem->am_obj = vm_object_allocate(OBJT_SWAP, atop(round_page(size)));
  495         mem->am_physical = 0;
  496         mem->am_offset = 0;
  497         mem->am_is_bound = 0;
  498         TAILQ_INSERT_TAIL(&sc->as_memory, mem, am_link);
  499         sc->as_allocated += size;
  500 
  501         return mem;
  502 }
  503 
  504 int
  505 agp_generic_free_memory(device_t dev, struct agp_memory *mem)
  506 {
  507         struct agp_softc *sc = device_get_softc(dev);
  508 
  509         if (mem->am_is_bound)
  510                 return EBUSY;
  511 
  512         sc->as_allocated -= mem->am_size;
  513         TAILQ_REMOVE(&sc->as_memory, mem, am_link);
  514         vm_object_deallocate(mem->am_obj);
  515         free(mem, M_AGP);
  516         return 0;
  517 }
  518 
  519 int
  520 agp_generic_bind_memory(device_t dev, struct agp_memory *mem,
  521                         vm_offset_t offset)
  522 {
  523         struct agp_softc *sc = device_get_softc(dev);
  524         vm_offset_t i, j, k;
  525         vm_page_t m;
  526         int error;
  527 
  528         /* Do some sanity checks first. */
  529         if ((offset & (AGP_PAGE_SIZE - 1)) != 0 ||
  530             offset + mem->am_size > AGP_GET_APERTURE(dev)) {
  531                 device_printf(dev, "binding memory at bad offset %#x\n",
  532                     (int)offset);
  533                 return EINVAL;
  534         }
  535 
  536         /*
  537          * Allocate the pages early, before acquiring the lock,
  538          * because vm_page_grab() may sleep and we can't hold a mutex
  539          * while sleeping.
  540          */
  541         VM_OBJECT_WLOCK(mem->am_obj);
  542         for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
  543                 /*
  544                  * Find a page from the object and wire it
  545                  * down. This page will be mapped using one or more
  546                  * entries in the GATT (assuming that PAGE_SIZE >=
  547                  * AGP_PAGE_SIZE. If this is the first call to bind,
  548                  * the pages will be allocated and zeroed.
  549                  */
  550                 m = vm_page_grab(mem->am_obj, OFF_TO_IDX(i),
  551                     VM_ALLOC_WIRED | VM_ALLOC_ZERO);
  552                 AGP_DPF("found page pa=%#jx\n", (uintmax_t)VM_PAGE_TO_PHYS(m));
  553         }
  554         VM_OBJECT_WUNLOCK(mem->am_obj);
  555 
  556         mtx_lock(&sc->as_lock);
  557 
  558         if (mem->am_is_bound) {
  559                 device_printf(dev, "memory already bound\n");
  560                 error = EINVAL;
  561                 VM_OBJECT_WLOCK(mem->am_obj);
  562                 i = 0;
  563                 goto bad;
  564         }
  565 
  566         /*
  567          * Bind the individual pages and flush the chipset's
  568          * TLB.
  569          */
  570         VM_OBJECT_WLOCK(mem->am_obj);
  571         for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
  572                 m = vm_page_lookup(mem->am_obj, OFF_TO_IDX(i));
  573 
  574                 /*
  575                  * Install entries in the GATT, making sure that if
  576                  * AGP_PAGE_SIZE < PAGE_SIZE and mem->am_size is not
  577                  * aligned to PAGE_SIZE, we don't modify too many GATT 
  578                  * entries.
  579                  */
  580                 for (j = 0; j < PAGE_SIZE && i + j < mem->am_size;
  581                      j += AGP_PAGE_SIZE) {
  582                         vm_offset_t pa = VM_PAGE_TO_PHYS(m) + j;
  583                         AGP_DPF("binding offset %#jx to pa %#jx\n",
  584                                 (uintmax_t)offset + i + j, (uintmax_t)pa);
  585                         error = AGP_BIND_PAGE(dev, offset + i + j, pa);
  586                         if (error) {
  587                                 /*
  588                                  * Bail out. Reverse all the mappings
  589                                  * and unwire the pages.
  590                                  */
  591                                 for (k = 0; k < i + j; k += AGP_PAGE_SIZE)
  592                                         AGP_UNBIND_PAGE(dev, offset + k);
  593                                 goto bad;
  594                         }
  595                 }
  596                 vm_page_xunbusy(m);
  597         }
  598         VM_OBJECT_WUNLOCK(mem->am_obj);
  599 
  600         /*
  601          * Make sure the chipset gets the new mappings.
  602          */
  603         AGP_FLUSH_TLB(dev);
  604 
  605         mem->am_offset = offset;
  606         mem->am_is_bound = 1;
  607 
  608         mtx_unlock(&sc->as_lock);
  609 
  610         return 0;
  611 bad:
  612         mtx_unlock(&sc->as_lock);
  613         VM_OBJECT_ASSERT_WLOCKED(mem->am_obj);
  614         for (k = 0; k < mem->am_size; k += PAGE_SIZE) {
  615                 m = vm_page_lookup(mem->am_obj, OFF_TO_IDX(k));
  616                 if (k >= i)
  617                         vm_page_xunbusy(m);
  618                 vm_page_unwire(m, PQ_INACTIVE);
  619         }
  620         VM_OBJECT_WUNLOCK(mem->am_obj);
  621 
  622         return error;
  623 }
  624 
  625 int
  626 agp_generic_unbind_memory(device_t dev, struct agp_memory *mem)
  627 {
  628         struct agp_softc *sc = device_get_softc(dev);
  629         vm_page_t m;
  630         int i;
  631 
  632         mtx_lock(&sc->as_lock);
  633 
  634         if (!mem->am_is_bound) {
  635                 device_printf(dev, "memory is not bound\n");
  636                 mtx_unlock(&sc->as_lock);
  637                 return EINVAL;
  638         }
  639 
  640         /*
  641          * Unbind the individual pages and flush the chipset's
  642          * TLB. Unwire the pages so they can be swapped.
  643          */
  644         for (i = 0; i < mem->am_size; i += AGP_PAGE_SIZE)
  645                 AGP_UNBIND_PAGE(dev, mem->am_offset + i);
  646 
  647         AGP_FLUSH_TLB(dev);
  648 
  649         VM_OBJECT_WLOCK(mem->am_obj);
  650         for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
  651                 m = vm_page_lookup(mem->am_obj, atop(i));
  652                 vm_page_unwire(m, PQ_INACTIVE);
  653         }
  654         VM_OBJECT_WUNLOCK(mem->am_obj);
  655 
  656         mem->am_offset = 0;
  657         mem->am_is_bound = 0;
  658 
  659         mtx_unlock(&sc->as_lock);
  660 
  661         return 0;
  662 }
  663 
  664 /* Helper functions for implementing user/kernel api */
  665 
  666 static int
  667 agp_acquire_helper(device_t dev, enum agp_acquire_state state)
  668 {
  669         struct agp_softc *sc = device_get_softc(dev);
  670 
  671         if (sc->as_state != AGP_ACQUIRE_FREE)
  672                 return EBUSY;
  673         sc->as_state = state;
  674 
  675         return 0;
  676 }
  677 
  678 static int
  679 agp_release_helper(device_t dev, enum agp_acquire_state state)
  680 {
  681         struct agp_softc *sc = device_get_softc(dev);
  682 
  683         if (sc->as_state == AGP_ACQUIRE_FREE)
  684                 return 0;
  685 
  686         if (sc->as_state != state)
  687                 return EBUSY;
  688 
  689         sc->as_state = AGP_ACQUIRE_FREE;
  690         return 0;
  691 }
  692 
  693 static struct agp_memory *
  694 agp_find_memory(device_t dev, int id)
  695 {
  696         struct agp_softc *sc = device_get_softc(dev);
  697         struct agp_memory *mem;
  698 
  699         AGP_DPF("searching for memory block %d\n", id);
  700         TAILQ_FOREACH(mem, &sc->as_memory, am_link) {
  701                 AGP_DPF("considering memory block %d\n", mem->am_id);
  702                 if (mem->am_id == id)
  703                         return mem;
  704         }
  705         return 0;
  706 }
  707 
  708 /* Implementation of the userland ioctl api */
  709 
  710 static int
  711 agp_info_user(device_t dev, agp_info *info)
  712 {
  713         struct agp_softc *sc = device_get_softc(dev);
  714 
  715         bzero(info, sizeof *info);
  716         info->bridge_id = pci_get_devid(dev);
  717         info->agp_mode = 
  718             pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  719         if (sc->as_aperture)
  720                 info->aper_base = rman_get_start(sc->as_aperture);
  721         else
  722                 info->aper_base = 0;
  723         info->aper_size = AGP_GET_APERTURE(dev) >> 20;
  724         info->pg_total = info->pg_system = sc->as_maxmem >> AGP_PAGE_SHIFT;
  725         info->pg_used = sc->as_allocated >> AGP_PAGE_SHIFT;
  726 
  727         return 0;
  728 }
  729 
  730 static int
  731 agp_setup_user(device_t dev, agp_setup *setup)
  732 {
  733         return AGP_ENABLE(dev, setup->agp_mode);
  734 }
  735 
  736 static int
  737 agp_allocate_user(device_t dev, agp_allocate *alloc)
  738 {
  739         struct agp_memory *mem;
  740 
  741         mem = AGP_ALLOC_MEMORY(dev,
  742                                alloc->type,
  743                                alloc->pg_count << AGP_PAGE_SHIFT);
  744         if (mem) {
  745                 alloc->key = mem->am_id;
  746                 alloc->physical = mem->am_physical;
  747                 return 0;
  748         } else {
  749                 return ENOMEM;
  750         }
  751 }
  752 
  753 static int
  754 agp_deallocate_user(device_t dev, int id)
  755 {
  756         struct agp_memory *mem = agp_find_memory(dev, id);
  757 
  758         if (mem) {
  759                 AGP_FREE_MEMORY(dev, mem);
  760                 return 0;
  761         } else {
  762                 return ENOENT;
  763         }
  764 }
  765 
  766 static int
  767 agp_bind_user(device_t dev, agp_bind *bind)
  768 {
  769         struct agp_memory *mem = agp_find_memory(dev, bind->key);
  770 
  771         if (!mem)
  772                 return ENOENT;
  773 
  774         return AGP_BIND_MEMORY(dev, mem, bind->pg_start << AGP_PAGE_SHIFT);
  775 }
  776 
  777 static int
  778 agp_unbind_user(device_t dev, agp_unbind *unbind)
  779 {
  780         struct agp_memory *mem = agp_find_memory(dev, unbind->key);
  781 
  782         if (!mem)
  783                 return ENOENT;
  784 
  785         return AGP_UNBIND_MEMORY(dev, mem);
  786 }
  787 
  788 static int
  789 agp_chipset_flush(device_t dev)
  790 {
  791 
  792         return (AGP_CHIPSET_FLUSH(dev));
  793 }
  794 
  795 static int
  796 agp_open(struct cdev *kdev, int oflags, int devtype, struct thread *td)
  797 {
  798         device_t dev = kdev->si_drv1;
  799         struct agp_softc *sc = device_get_softc(dev);
  800 
  801         if (!sc->as_isopen) {
  802                 sc->as_isopen = 1;
  803                 device_busy(dev);
  804         }
  805 
  806         return 0;
  807 }
  808 
  809 static int
  810 agp_close(struct cdev *kdev, int fflag, int devtype, struct thread *td)
  811 {
  812         device_t dev = kdev->si_drv1;
  813         struct agp_softc *sc = device_get_softc(dev);
  814         struct agp_memory *mem;
  815 
  816         /*
  817          * Clear the GATT and force release on last close
  818          */
  819         while ((mem = TAILQ_FIRST(&sc->as_memory)) != NULL) {
  820                 if (mem->am_is_bound)
  821                         AGP_UNBIND_MEMORY(dev, mem);
  822                 AGP_FREE_MEMORY(dev, mem);
  823         }
  824         if (sc->as_state == AGP_ACQUIRE_USER)
  825                 agp_release_helper(dev, AGP_ACQUIRE_USER);
  826         sc->as_isopen = 0;
  827         device_unbusy(dev);
  828 
  829         return 0;
  830 }
  831 
  832 static int
  833 agp_ioctl(struct cdev *kdev, u_long cmd, caddr_t data, int fflag, struct thread *td)
  834 {
  835         device_t dev = kdev->si_drv1;
  836 
  837         switch (cmd) {
  838         case AGPIOC_INFO:
  839                 return agp_info_user(dev, (agp_info *) data);
  840 
  841         case AGPIOC_ACQUIRE:
  842                 return agp_acquire_helper(dev, AGP_ACQUIRE_USER);
  843 
  844         case AGPIOC_RELEASE:
  845                 return agp_release_helper(dev, AGP_ACQUIRE_USER);
  846 
  847         case AGPIOC_SETUP:
  848                 return agp_setup_user(dev, (agp_setup *)data);
  849 
  850         case AGPIOC_ALLOCATE:
  851                 return agp_allocate_user(dev, (agp_allocate *)data);
  852 
  853         case AGPIOC_DEALLOCATE:
  854                 return agp_deallocate_user(dev, *(int *) data);
  855 
  856         case AGPIOC_BIND:
  857                 return agp_bind_user(dev, (agp_bind *)data);
  858 
  859         case AGPIOC_UNBIND:
  860                 return agp_unbind_user(dev, (agp_unbind *)data);
  861 
  862         case AGPIOC_CHIPSET_FLUSH:
  863                 return agp_chipset_flush(dev);
  864         }
  865 
  866         return EINVAL;
  867 }
  868 
  869 static int
  870 agp_mmap(struct cdev *kdev, vm_ooffset_t offset, vm_paddr_t *paddr,
  871     int prot, vm_memattr_t *memattr)
  872 {
  873         device_t dev = kdev->si_drv1;
  874         struct agp_softc *sc = device_get_softc(dev);
  875 
  876         if (offset > AGP_GET_APERTURE(dev))
  877                 return -1;
  878         if (sc->as_aperture == NULL)
  879                 return -1;
  880         *paddr = rman_get_start(sc->as_aperture) + offset;
  881         return 0;
  882 }
  883 
  884 /* Implementation of the kernel api */
  885 
  886 device_t
  887 agp_find_device(void)
  888 {
  889         device_t *children, child;
  890         int i, count;
  891 
  892         if (!agp_devclass)
  893                 return NULL;
  894         if (devclass_get_devices(agp_devclass, &children, &count) != 0)
  895                 return NULL;
  896         child = NULL;
  897         for (i = 0; i < count; i++) {
  898                 if (device_is_attached(children[i])) {
  899                         child = children[i];
  900                         break;
  901                 }
  902         }
  903         free(children, M_TEMP);
  904         return child;
  905 }
  906 
  907 enum agp_acquire_state
  908 agp_state(device_t dev)
  909 {
  910         struct agp_softc *sc = device_get_softc(dev);
  911         return sc->as_state;
  912 }
  913 
  914 void
  915 agp_get_info(device_t dev, struct agp_info *info)
  916 {
  917         struct agp_softc *sc = device_get_softc(dev);
  918 
  919         info->ai_mode =
  920                 pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  921         if (sc->as_aperture != NULL)
  922                 info->ai_aperture_base = rman_get_start(sc->as_aperture);
  923         else
  924                 info->ai_aperture_base = 0;
  925         info->ai_aperture_size = AGP_GET_APERTURE(dev);
  926         info->ai_memory_allowed = sc->as_maxmem;
  927         info->ai_memory_used = sc->as_allocated;
  928 }
  929 
  930 int
  931 agp_acquire(device_t dev)
  932 {
  933         return agp_acquire_helper(dev, AGP_ACQUIRE_KERNEL);
  934 }
  935 
  936 int
  937 agp_release(device_t dev)
  938 {
  939         return agp_release_helper(dev, AGP_ACQUIRE_KERNEL);
  940 }
  941 
  942 int
  943 agp_enable(device_t dev, u_int32_t mode)
  944 {
  945         return AGP_ENABLE(dev, mode);
  946 }
  947 
  948 void *agp_alloc_memory(device_t dev, int type, vm_size_t bytes)
  949 {
  950         return  (void *) AGP_ALLOC_MEMORY(dev, type, bytes);
  951 }
  952 
  953 void agp_free_memory(device_t dev, void *handle)
  954 {
  955         struct agp_memory *mem = (struct agp_memory *) handle;
  956         AGP_FREE_MEMORY(dev, mem);
  957 }
  958 
  959 int agp_bind_memory(device_t dev, void *handle, vm_offset_t offset)
  960 {
  961         struct agp_memory *mem = (struct agp_memory *) handle;
  962         return AGP_BIND_MEMORY(dev, mem, offset);
  963 }
  964 
  965 int agp_unbind_memory(device_t dev, void *handle)
  966 {
  967         struct agp_memory *mem = (struct agp_memory *) handle;
  968         return AGP_UNBIND_MEMORY(dev, mem);
  969 }
  970 
  971 void agp_memory_info(device_t dev, void *handle, struct
  972                      agp_memory_info *mi)
  973 {
  974         struct agp_memory *mem = (struct agp_memory *) handle;
  975 
  976         mi->ami_size = mem->am_size;
  977         mi->ami_physical = mem->am_physical;
  978         mi->ami_offset = mem->am_offset;
  979         mi->ami_is_bound = mem->am_is_bound;
  980 }
  981 
  982 int
  983 agp_bind_pages(device_t dev, vm_page_t *pages, vm_size_t size,
  984     vm_offset_t offset)
  985 {
  986         struct agp_softc *sc;
  987         vm_offset_t i, j, k, pa;
  988         vm_page_t m;
  989         int error;
  990 
  991         if ((size & (AGP_PAGE_SIZE - 1)) != 0 ||
  992             (offset & (AGP_PAGE_SIZE - 1)) != 0)
  993                 return (EINVAL);
  994 
  995         sc = device_get_softc(dev);
  996 
  997         mtx_lock(&sc->as_lock);
  998         for (i = 0; i < size; i += PAGE_SIZE) {
  999                 m = pages[OFF_TO_IDX(i)];
 1000                 KASSERT(vm_page_wired(m),
 1001                     ("agp_bind_pages: page %p hasn't been wired", m));
 1002 
 1003                 /*
 1004                  * Install entries in the GATT, making sure that if
 1005                  * AGP_PAGE_SIZE < PAGE_SIZE and size is not
 1006                  * aligned to PAGE_SIZE, we don't modify too many GATT 
 1007                  * entries.
 1008                  */
 1009                 for (j = 0; j < PAGE_SIZE && i + j < size; j += AGP_PAGE_SIZE) {
 1010                         pa = VM_PAGE_TO_PHYS(m) + j;
 1011                         AGP_DPF("binding offset %#jx to pa %#jx\n",
 1012                                 (uintmax_t)offset + i + j, (uintmax_t)pa);
 1013                         error = AGP_BIND_PAGE(dev, offset + i + j, pa);
 1014                         if (error) {
 1015                                 /*
 1016                                  * Bail out. Reverse all the mappings.
 1017                                  */
 1018                                 for (k = 0; k < i + j; k += AGP_PAGE_SIZE)
 1019                                         AGP_UNBIND_PAGE(dev, offset + k);
 1020 
 1021                                 mtx_unlock(&sc->as_lock);
 1022                                 return (error);
 1023                         }
 1024                 }
 1025         }
 1026 
 1027         AGP_FLUSH_TLB(dev);
 1028 
 1029         mtx_unlock(&sc->as_lock);
 1030         return (0);
 1031 }
 1032 
 1033 int
 1034 agp_unbind_pages(device_t dev, vm_size_t size, vm_offset_t offset)
 1035 {
 1036         struct agp_softc *sc;
 1037         vm_offset_t i;
 1038 
 1039         if ((size & (AGP_PAGE_SIZE - 1)) != 0 ||
 1040             (offset & (AGP_PAGE_SIZE - 1)) != 0)
 1041                 return (EINVAL);
 1042 
 1043         sc = device_get_softc(dev);
 1044 
 1045         mtx_lock(&sc->as_lock);
 1046         for (i = 0; i < size; i += AGP_PAGE_SIZE)
 1047                 AGP_UNBIND_PAGE(dev, offset + i);
 1048 
 1049         AGP_FLUSH_TLB(dev);
 1050 
 1051         mtx_unlock(&sc->as_lock);
 1052         return (0);
 1053 }

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