agp.c

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    1 /*-
    2  * Copyright (c) 2000 Doug Rabson
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: src/sys/dev/agp/agp.c,v 1.62 2009/02/06 20:57:10 wkoszek Exp $
   27  */
   28 
   29 #include "opt_agp.h"
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/device.h>
   34 #include <sys/conf.h>
   35 #include <sys/malloc.h>
   36 #include <sys/kernel.h>
   37 #include <sys/bus.h>
   38 #include <sys/agpio.h>
   39 #include <sys/lock.h>
   40 #include <sys/proc.h>
   41 #include <sys/rman.h>
   42 
   43 #include <bus/pci/pcivar.h>
   44 #include <bus/pci/pcireg.h>
   45 #include "agppriv.h"
   46 #include "agpvar.h"
   47 #include "agpreg.h"
   48 
   49 #include <vm/vm.h>
   50 #include <vm/vm_object.h>
   51 #include <vm/vm_page.h>
   52 #include <vm/vm_pageout.h>
   53 #include <vm/pmap.h>
   54 
   55 #include <machine/md_var.h>
   56 
   57 MODULE_VERSION(agp, 1);
   58 
   59 MALLOC_DEFINE(M_AGP, "agp", "AGP data structures");
   60 
   61 static d_open_t agp_open;
   62 static d_close_t agp_close;
   63 static d_ioctl_t agp_ioctl;
   64 static d_mmap_t agp_mmap;
   65 
   66 static struct dev_ops agp_ops = {
   67         { "agp", 0, D_TTY },
   68         .d_open =       agp_open,
   69         .d_close =      agp_close,
   70         .d_ioctl =      agp_ioctl,
   71         .d_mmap =       agp_mmap,
   72 };
   73 
   74 static devclass_t agp_devclass;
   75 
   76 /* Helper functions for implementing chipset mini drivers. */
   77 
   78 void
   79 agp_flush_cache(void)
   80 {
   81 #if defined(__i386__) || defined(__x86_64__)
   82         wbinvd();
   83 #endif
   84 }
   85 
   86 u_int8_t
   87 agp_find_caps(device_t dev)
   88 {
   89         int capreg;
   90 
   91         if (pci_find_extcap(dev, PCIY_AGP, &capreg) != 0)
   92                 capreg = 0;
   93         return (capreg);
   94 }
   95 
   96 /*
   97  * Find an AGP display device (if any).
   98  */
   99 static device_t
  100 agp_find_display(void)
  101 {
  102         devclass_t pci = devclass_find("pci");
  103         device_t bus, dev = 0;
  104         device_t *kids;
  105         int busnum, numkids, i;
  106 
  107         for (busnum = 0; busnum < devclass_get_maxunit(pci); busnum++) {
  108                 bus = devclass_get_device(pci, busnum);
  109                 if (!bus)
  110                         continue;
  111                 device_get_children(bus, &kids, &numkids);
  112                 for (i = 0; i < numkids; i++) {
  113                         dev = kids[i];
  114                         if (pci_get_class(dev) == PCIC_DISPLAY)
  115                                 if (agp_find_caps(dev)) {
  116                                         kfree(kids, M_TEMP);
  117                                         return dev;
  118                                 }
  119                                         
  120                 }
  121                 kfree(kids, M_TEMP);
  122         }
  123 
  124         return 0;
  125 }
  126 
  127 struct agp_gatt *
  128 agp_alloc_gatt(device_t dev)
  129 {
  130         u_int32_t apsize = AGP_GET_APERTURE(dev);
  131         u_int32_t entries = apsize >> AGP_PAGE_SHIFT;
  132         struct agp_gatt *gatt;
  133 
  134         if (bootverbose)
  135                 device_printf(dev,
  136                               "allocating GATT for aperture of size %dM\n",
  137                               apsize / (1024*1024));
  138 
  139         if (entries == 0) {
  140                 device_printf(dev, "bad aperture size\n");
  141                 return NULL;
  142         }
  143 
  144         gatt = kmalloc(sizeof(struct agp_gatt), M_AGP, M_INTWAIT);
  145         gatt->ag_entries = entries;
  146         gatt->ag_virtual = contigmalloc(entries * sizeof(u_int32_t), M_AGP,
  147                                         M_WAITOK|M_ZERO, 0, ~0, PAGE_SIZE, 0);
  148         if (!gatt->ag_virtual) {
  149                 if (bootverbose)
  150                         device_printf(dev, "contiguous allocation failed\n");
  151                 kfree(gatt, M_AGP);
  152                 return 0;
  153         }
  154         gatt->ag_physical = vtophys((vm_offset_t) gatt->ag_virtual);
  155         agp_flush_cache();
  156 
  157         return gatt;
  158 }
  159 
  160 void
  161 agp_free_gatt(struct agp_gatt *gatt)
  162 {
  163         contigfree(gatt->ag_virtual,
  164                    gatt->ag_entries * sizeof(u_int32_t), M_AGP);
  165         kfree(gatt, M_AGP);
  166 }
  167 
  168 static u_int agp_max[][2] = {
  169         {0,     0},
  170         {32,    4},
  171         {64,    28},
  172         {128,   96},
  173         {256,   204},
  174         {512,   440},
  175         {1024,  942},
  176         {2048,  1920},
  177         {4096,  3932}
  178 };
  179 #define agp_max_size    NELEM(agp_max)
  180 
  181 /**
  182  * Sets the PCI resource which represents the AGP aperture.
  183  *
  184  * If not called, the default AGP aperture resource of AGP_APBASE will
  185  * be used.  Must be called before agp_generic_attach().
  186  */
  187 void
  188 agp_set_aperture_resource(device_t dev, int rid)
  189 {
  190         struct agp_softc *sc = device_get_softc(dev);
  191 
  192         sc->as_aperture_rid = rid;
  193 }
  194 
  195 int
  196 agp_generic_attach(device_t dev)
  197 {
  198         struct agp_softc *sc = device_get_softc(dev);
  199         int i;
  200         u_int memsize;
  201 
  202         /*
  203          * Find and map the aperture, RF_SHAREABLE for DRM but not RF_ACTIVE
  204          * because the kernel doesn't need to map it.
  205          */
  206         if (sc->as_aperture_rid == 0)
  207                 sc->as_aperture_rid = AGP_APBASE;
  208 
  209         sc->as_aperture = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
  210             &sc->as_aperture_rid, RF_SHAREABLE);
  211         if (!sc->as_aperture)
  212                 return ENOMEM;
  213 
  214         /*
  215          * Work out an upper bound for agp memory allocation. This
  216          * uses a heurisitc table from the Linux driver.
  217          */
  218         memsize = ptoa(Maxmem) >> 20;
  219         for (i = 0; i < agp_max_size; i++) {
  220                 if (memsize <= agp_max[i][0])
  221                         break;
  222         }
  223         if (i == agp_max_size)
  224                 i = agp_max_size - 1;
  225         sc->as_maxmem = agp_max[i][1] << 20U;
  226 
  227         /*
  228          * The lock is used to prevent re-entry to
  229          * agp_generic_bind_memory() since that function can sleep.
  230          */
  231         lockinit(&sc->as_lock, "agplk", 0, 0);
  232 
  233         /*
  234          * Initialise stuff for the userland device.
  235          */
  236         agp_devclass = devclass_find("agp");
  237         TAILQ_INIT(&sc->as_memory);
  238         sc->as_nextid = 1;
  239 
  240         sc->as_devnode = make_dev(&agp_ops,
  241             0, UID_ROOT, GID_WHEEL, 0600, "agpgart");
  242         sc->as_devnode->si_drv1 = dev;
  243 
  244         return 0;
  245 }
  246 
  247 void
  248 agp_free_cdev(device_t dev)
  249 {
  250         dev_ops_remove_minor(&agp_ops, device_get_unit(dev));
  251 }
  252 
  253 void
  254 agp_free_res(device_t dev)
  255 {
  256         struct agp_softc *sc = device_get_softc(dev);
  257 
  258         bus_release_resource(dev, SYS_RES_MEMORY, sc->as_aperture_rid,
  259                              sc->as_aperture);
  260         agp_flush_cache();
  261 }
  262 
  263 int
  264 agp_generic_detach(device_t dev)
  265 {
  266         agp_free_cdev(dev);
  267         agp_free_res(dev);
  268         return 0;
  269 }
  270 
  271 /**
  272  * Default AGP aperture size detection which simply returns the size of
  273  * the aperture's PCI resource.
  274  */
  275 u_int32_t
  276 agp_generic_get_aperture(device_t dev)
  277 {
  278         struct agp_softc *sc = device_get_softc(dev);
  279 
  280         return rman_get_size(sc->as_aperture);
  281 }
  282 
  283 /**
  284  * Default AGP aperture size setting function, which simply doesn't allow
  285  * changes to resource size.
  286  */
  287 int
  288 agp_generic_set_aperture(device_t dev, u_int32_t aperture)
  289 {
  290         u_int32_t current_aperture;
  291 
  292         current_aperture = AGP_GET_APERTURE(dev);
  293         if (current_aperture != aperture)
  294                 return EINVAL;
  295         else
  296                 return 0;
  297 }
  298 
  299 /*
  300  * This does the enable logic for v3, with the same topology
  301  * restrictions as in place for v2 -- one bus, one device on the bus.
  302  */
  303 static int
  304 agp_v3_enable(device_t dev, device_t mdev, u_int32_t mode)
  305 {
  306         u_int32_t tstatus, mstatus;
  307         u_int32_t command;
  308         int rq, sba, fw, rate, arqsz, cal;
  309 
  310         tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  311         mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
  312 
  313         /* Set RQ to the min of mode, tstatus and mstatus */
  314         rq = AGP_MODE_GET_RQ(mode);
  315         if (AGP_MODE_GET_RQ(tstatus) < rq)
  316                 rq = AGP_MODE_GET_RQ(tstatus);
  317         if (AGP_MODE_GET_RQ(mstatus) < rq)
  318                 rq = AGP_MODE_GET_RQ(mstatus);
  319 
  320         /*
  321          * ARQSZ - Set the value to the maximum one.
  322          * Don't allow the mode register to override values.
  323          */
  324         arqsz = AGP_MODE_GET_ARQSZ(mode);
  325         if (AGP_MODE_GET_ARQSZ(tstatus) > rq)
  326                 rq = AGP_MODE_GET_ARQSZ(tstatus);
  327         if (AGP_MODE_GET_ARQSZ(mstatus) > rq)
  328                 rq = AGP_MODE_GET_ARQSZ(mstatus);
  329 
  330         /* Calibration cycle - don't allow override by mode register */
  331         cal = AGP_MODE_GET_CAL(tstatus);
  332         if (AGP_MODE_GET_CAL(mstatus) < cal)
  333                 cal = AGP_MODE_GET_CAL(mstatus);
  334 
  335         /* SBA must be supported for AGP v3. */
  336         sba = 1;
  337 
  338         /* Set FW if all three support it. */
  339         fw = (AGP_MODE_GET_FW(tstatus)
  340                & AGP_MODE_GET_FW(mstatus)
  341                & AGP_MODE_GET_FW(mode));
  342         
  343         /* Figure out the max rate */
  344         rate = (AGP_MODE_GET_RATE(tstatus)
  345                 & AGP_MODE_GET_RATE(mstatus)
  346                 & AGP_MODE_GET_RATE(mode));
  347         if (rate & AGP_MODE_V3_RATE_8x)
  348                 rate = AGP_MODE_V3_RATE_8x;
  349         else
  350                 rate = AGP_MODE_V3_RATE_4x;
  351         if (bootverbose)
  352                 device_printf(dev, "Setting AGP v3 mode %d\n", rate * 4);
  353 
  354         pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, 0, 4);
  355 
  356         /* Construct the new mode word and tell the hardware */
  357         command = 0;
  358         command = AGP_MODE_SET_RQ(0, rq);
  359         command = AGP_MODE_SET_ARQSZ(command, arqsz);
  360         command = AGP_MODE_SET_CAL(command, cal);
  361         command = AGP_MODE_SET_SBA(command, sba);
  362         command = AGP_MODE_SET_FW(command, fw);
  363         command = AGP_MODE_SET_RATE(command, rate);
  364         command = AGP_MODE_SET_MODE_3(command, 1);
  365         command = AGP_MODE_SET_AGP(command, 1);
  366         pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4);
  367         pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4);
  368 
  369         return 0;
  370 }
  371 
  372 static int
  373 agp_v2_enable(device_t dev, device_t mdev, u_int32_t mode)
  374 {
  375         u_int32_t tstatus, mstatus;
  376         u_int32_t command;
  377         int rq, sba, fw, rate;
  378 
  379         tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  380         mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
  381 
  382         /* Set RQ to the min of mode, tstatus and mstatus */
  383         rq = AGP_MODE_GET_RQ(mode);
  384         if (AGP_MODE_GET_RQ(tstatus) < rq)
  385                 rq = AGP_MODE_GET_RQ(tstatus);
  386         if (AGP_MODE_GET_RQ(mstatus) < rq)
  387                 rq = AGP_MODE_GET_RQ(mstatus);
  388 
  389         /* Set SBA if all three can deal with SBA */
  390         sba = (AGP_MODE_GET_SBA(tstatus)
  391                & AGP_MODE_GET_SBA(mstatus)
  392                & AGP_MODE_GET_SBA(mode));
  393 
  394         /* Similar for FW */
  395         fw = (AGP_MODE_GET_FW(tstatus)
  396                & AGP_MODE_GET_FW(mstatus)
  397                & AGP_MODE_GET_FW(mode));
  398 
  399         /* Figure out the max rate */
  400         rate = (AGP_MODE_GET_RATE(tstatus)
  401                 & AGP_MODE_GET_RATE(mstatus)
  402                 & AGP_MODE_GET_RATE(mode));
  403         if (rate & AGP_MODE_V2_RATE_4x)
  404                 rate = AGP_MODE_V2_RATE_4x;
  405         else if (rate & AGP_MODE_V2_RATE_2x)
  406                 rate = AGP_MODE_V2_RATE_2x;
  407         else
  408                 rate = AGP_MODE_V2_RATE_1x;
  409         if (bootverbose)
  410                 device_printf(dev, "Setting AGP v2 mode %d\n", rate);
  411 
  412         /* Construct the new mode word and tell the hardware */
  413         command = 0;
  414         command = AGP_MODE_SET_RQ(0, rq);
  415         command = AGP_MODE_SET_SBA(command, sba);
  416         command = AGP_MODE_SET_FW(command, fw);
  417         command = AGP_MODE_SET_RATE(command, rate);
  418         command = AGP_MODE_SET_AGP(command, 1);
  419         pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4);
  420         pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4);
  421 
  422         return 0;
  423 }
  424 
  425 int
  426 agp_generic_enable(device_t dev, u_int32_t mode)
  427 {
  428         device_t mdev = agp_find_display();
  429         u_int32_t tstatus, mstatus;
  430 
  431         if (!mdev) {
  432                 AGP_DPF("can't find display\n");
  433                 return ENXIO;
  434         }
  435 
  436         tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  437         mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
  438 
  439         /*
  440          * Check display and bridge for AGP v3 support.  AGP v3 allows
  441          * more variety in topology than v2, e.g. multiple AGP devices
  442          * attached to one bridge, or multiple AGP bridges in one
  443          * system.  This doesn't attempt to address those situations,
  444          * but should work fine for a classic single AGP slot system
  445          * with AGP v3.
  446          */
  447         if (AGP_MODE_GET_MODE_3(mode) &&
  448             AGP_MODE_GET_MODE_3(tstatus) &&
  449             AGP_MODE_GET_MODE_3(mstatus))
  450                 return (agp_v3_enable(dev, mdev, mode));
  451         else
  452                 return (agp_v2_enable(dev, mdev, mode));            
  453 }
  454 
  455 struct agp_memory *
  456 agp_generic_alloc_memory(device_t dev, int type, vm_size_t size)
  457 {
  458         struct agp_softc *sc = device_get_softc(dev);
  459         struct agp_memory *mem;
  460 
  461         if ((size & (AGP_PAGE_SIZE - 1)) != 0)
  462                 return 0;
  463 
  464         if (sc->as_allocated + size > sc->as_maxmem)
  465                 return 0;
  466 
  467         if (type != 0) {
  468                 kprintf("agp_generic_alloc_memory: unsupported type %d\n",
  469                         type);
  470                 return 0;
  471         }
  472 
  473         mem = kmalloc(sizeof *mem, M_AGP, M_INTWAIT);
  474         mem->am_id = sc->as_nextid++;
  475         mem->am_size = size;
  476         mem->am_type = 0;
  477         mem->am_obj = vm_object_allocate(OBJT_DEFAULT, atop(round_page(size)));
  478         mem->am_physical = 0;
  479         mem->am_offset = 0;
  480         mem->am_is_bound = 0;
  481         TAILQ_INSERT_TAIL(&sc->as_memory, mem, am_link);
  482         sc->as_allocated += size;
  483 
  484         return mem;
  485 }
  486 
  487 int
  488 agp_generic_free_memory(device_t dev, struct agp_memory *mem)
  489 {
  490         struct agp_softc *sc = device_get_softc(dev);
  491 
  492         if (mem->am_is_bound)
  493                 return EBUSY;
  494 
  495         sc->as_allocated -= mem->am_size;
  496         TAILQ_REMOVE(&sc->as_memory, mem, am_link);
  497         vm_object_deallocate(mem->am_obj);
  498         kfree(mem, M_AGP);
  499         return 0;
  500 }
  501 
  502 int
  503 agp_generic_bind_memory(device_t dev, struct agp_memory *mem,
  504                         vm_offset_t offset)
  505 {
  506         struct agp_softc *sc = device_get_softc(dev);
  507         vm_offset_t i, j, k;
  508         vm_page_t m;
  509         int error;
  510 
  511         lockmgr(&sc->as_lock, LK_EXCLUSIVE);
  512 
  513         if (mem->am_is_bound) {
  514                 device_printf(dev, "memory already bound\n");
  515                 lockmgr(&sc->as_lock, LK_RELEASE);
  516                 return EINVAL;
  517         }
  518         
  519         /* Do some sanity checks first. */
  520         if (offset < 0
  521             || (offset & (AGP_PAGE_SIZE - 1)) != 0
  522             || offset + mem->am_size > AGP_GET_APERTURE(dev)) {
  523                 device_printf(dev, "binding memory at bad offset %#x,%#x,%#x\n",
  524                               (int) offset, (int)mem->am_size,
  525                               (int)AGP_GET_APERTURE(dev));
  526                 kprintf("Check BIOS's aperature size vs X\n");
  527                 lockmgr(&sc->as_lock, LK_RELEASE);
  528                 return EINVAL;
  529         }
  530 
  531         /*
  532          * Bind the individual pages and flush the chipset's
  533          * TLB.
  534          */
  535         for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
  536                 /*
  537                  * Find a page from the object and wire it down. This page
  538                  * will be mapped using one or more entries in the GATT
  539                  * (assuming that PAGE_SIZE >= AGP_PAGE_SIZE. If this is
  540                  * the first call to bind, the pages will be allocated
  541                  * and zeroed.
  542                  */
  543                 m = vm_page_grab(mem->am_obj, OFF_TO_IDX(i),
  544                                  VM_ALLOC_NORMAL | VM_ALLOC_ZERO |
  545                                  VM_ALLOC_RETRY);
  546                 AGP_DPF("found page pa=%#jx\n", (uintmax_t)VM_PAGE_TO_PHYS(m));
  547                 vm_page_wire(m);
  548 
  549                 /*
  550                  * Install entries in the GATT, making sure that if
  551                  * AGP_PAGE_SIZE < PAGE_SIZE and mem->am_size is not
  552                  * aligned to PAGE_SIZE, we don't modify too many GATT 
  553                  * entries.
  554                  */
  555                 for (j = 0; j < PAGE_SIZE && i + j < mem->am_size;
  556                      j += AGP_PAGE_SIZE) {
  557                         vm_offset_t pa = VM_PAGE_TO_PHYS(m) + j;
  558                         AGP_DPF("binding offset %#jx to pa %#jx\n",
  559                                 (uintmax_t)offset + i + j, (uintmax_t)pa);
  560                         error = AGP_BIND_PAGE(dev, offset + i + j, pa);
  561                         if (error) {
  562                                 /*
  563                                  * Bail out. Reverse all the mappings
  564                                  * and unwire the pages.
  565                                  */
  566                                 vm_page_wakeup(m);
  567                                 for (k = 0; k < i + j; k += AGP_PAGE_SIZE)
  568                                         AGP_UNBIND_PAGE(dev, offset + k);
  569                                 vm_object_hold(mem->am_obj);
  570                                 for (k = 0; k <= i; k += PAGE_SIZE) {
  571                                         m = vm_page_lookup_busy_wait(
  572                                                 mem->am_obj, OFF_TO_IDX(k),
  573                                                 FALSE, "agppg");
  574                                         vm_page_unwire(m, 0);
  575                                         vm_page_wakeup(m);
  576                                 }
  577                                 vm_object_drop(mem->am_obj);
  578                                 lockmgr(&sc->as_lock, LK_RELEASE);
  579                                 return error;
  580                         }
  581                 }
  582                 vm_page_wakeup(m);
  583         }
  584 
  585         /*
  586          * Flush the cpu cache since we are providing a new mapping
  587          * for these pages.
  588          */
  589         agp_flush_cache();
  590 
  591         /*
  592          * Make sure the chipset gets the new mappings.
  593          */
  594         AGP_FLUSH_TLB(dev);
  595 
  596         mem->am_offset = offset;
  597         mem->am_is_bound = 1;
  598 
  599         lockmgr(&sc->as_lock, LK_RELEASE);
  600 
  601         return 0;
  602 }
  603 
  604 int
  605 agp_generic_unbind_memory(device_t dev, struct agp_memory *mem)
  606 {
  607         struct agp_softc *sc = device_get_softc(dev);
  608         vm_page_t m;
  609         int i;
  610 
  611         lockmgr(&sc->as_lock, LK_EXCLUSIVE);
  612 
  613         if (!mem->am_is_bound) {
  614                 device_printf(dev, "memory is not bound\n");
  615                 lockmgr(&sc->as_lock, LK_RELEASE);
  616                 return EINVAL;
  617         }
  618 
  619 
  620         /*
  621          * Unbind the individual pages and flush the chipset's
  622          * TLB. Unwire the pages so they can be swapped.
  623          */
  624         for (i = 0; i < mem->am_size; i += AGP_PAGE_SIZE)
  625                 AGP_UNBIND_PAGE(dev, mem->am_offset + i);
  626         vm_object_hold(mem->am_obj);
  627         for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
  628                 m = vm_page_lookup_busy_wait(mem->am_obj, atop(i),
  629                                              FALSE, "agppg");
  630                 vm_page_unwire(m, 0);
  631                 vm_page_wakeup(m);
  632         }
  633         vm_object_drop(mem->am_obj);
  634                 
  635         agp_flush_cache();
  636         AGP_FLUSH_TLB(dev);
  637 
  638         mem->am_offset = 0;
  639         mem->am_is_bound = 0;
  640 
  641         lockmgr(&sc->as_lock, LK_RELEASE);
  642 
  643         return 0;
  644 }
  645 
  646 /* Helper functions for implementing user/kernel api */
  647 
  648 static int
  649 agp_acquire_helper(device_t dev, enum agp_acquire_state state)
  650 {
  651         struct agp_softc *sc = device_get_softc(dev);
  652 
  653         if (sc->as_state != AGP_ACQUIRE_FREE)
  654                 return EBUSY;
  655         sc->as_state = state;
  656 
  657         return 0;
  658 }
  659 
  660 static int
  661 agp_release_helper(device_t dev, enum agp_acquire_state state)
  662 {
  663         struct agp_softc *sc = device_get_softc(dev);
  664 
  665         if (sc->as_state == AGP_ACQUIRE_FREE)
  666                 return 0;
  667 
  668         if (sc->as_state != state)
  669                 return EBUSY;
  670 
  671         sc->as_state = AGP_ACQUIRE_FREE;
  672         return 0;
  673 }
  674 
  675 static struct agp_memory *
  676 agp_find_memory(device_t dev, int id)
  677 {
  678         struct agp_softc *sc = device_get_softc(dev);
  679         struct agp_memory *mem;
  680 
  681         AGP_DPF("searching for memory block %d\n", id);
  682         TAILQ_FOREACH(mem, &sc->as_memory, am_link) {
  683                 AGP_DPF("considering memory block %d\n", mem->am_id);
  684                 if (mem->am_id == id)
  685                         return mem;
  686         }
  687         return 0;
  688 }
  689 
  690 /* Implementation of the userland ioctl api */
  691 
  692 static int
  693 agp_info_user(device_t dev, agp_info *info)
  694 {
  695         struct agp_softc *sc = device_get_softc(dev);
  696 
  697         bzero(info, sizeof *info);
  698         info->bridge_id = pci_get_devid(dev);
  699         info->agp_mode = 
  700             pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  701         info->aper_base = rman_get_start(sc->as_aperture);
  702         info->aper_size = AGP_GET_APERTURE(dev) >> 20;
  703         info->pg_total = info->pg_system = sc->as_maxmem >> AGP_PAGE_SHIFT;
  704         info->pg_used = sc->as_allocated >> AGP_PAGE_SHIFT;
  705 
  706         return 0;
  707 }
  708 
  709 static int
  710 agp_setup_user(device_t dev, agp_setup *setup)
  711 {
  712         return AGP_ENABLE(dev, setup->agp_mode);
  713 }
  714 
  715 static int
  716 agp_allocate_user(device_t dev, agp_allocate *alloc)
  717 {
  718         struct agp_memory *mem;
  719 
  720         mem = AGP_ALLOC_MEMORY(dev,
  721                                alloc->type,
  722                                alloc->pg_count << AGP_PAGE_SHIFT);
  723         if (mem) {
  724                 alloc->key = mem->am_id;
  725                 alloc->physical = mem->am_physical;
  726                 return 0;
  727         } else {
  728                 return ENOMEM;
  729         }
  730 }
  731 
  732 static int
  733 agp_deallocate_user(device_t dev, int id)
  734 {
  735         struct agp_memory *mem = agp_find_memory(dev, id);
  736 
  737         if (mem) {
  738                 AGP_FREE_MEMORY(dev, mem);
  739                 return 0;
  740         } else {
  741                 return ENOENT;
  742         }
  743 }
  744 
  745 static int
  746 agp_bind_user(device_t dev, agp_bind *bind)
  747 {
  748         struct agp_memory *mem = agp_find_memory(dev, bind->key);
  749 
  750         if (!mem)
  751                 return ENOENT;
  752 
  753         return AGP_BIND_MEMORY(dev, mem, bind->pg_start << AGP_PAGE_SHIFT);
  754 }
  755 
  756 static int
  757 agp_unbind_user(device_t dev, agp_unbind *unbind)
  758 {
  759         struct agp_memory *mem = agp_find_memory(dev, unbind->key);
  760 
  761         if (!mem)
  762                 return ENOENT;
  763 
  764         return AGP_UNBIND_MEMORY(dev, mem);
  765 }
  766 
  767 static int
  768 agp_chipset_flush(device_t dev)
  769 {
  770 
  771         return (AGP_CHIPSET_FLUSH(dev));
  772 }
  773 
  774 static int
  775 agp_open(struct dev_open_args *ap)
  776 {
  777         cdev_t kdev = ap->a_head.a_dev;
  778         device_t dev = kdev->si_drv1;
  779         struct agp_softc *sc = device_get_softc(dev);
  780 
  781         if (!sc->as_isopen) {
  782                 sc->as_isopen = 1;
  783                 device_busy(dev);
  784         }
  785 
  786         return 0;
  787 }
  788 
  789 static int
  790 agp_close(struct dev_close_args *ap)
  791 {
  792         cdev_t kdev = ap->a_head.a_dev;
  793         device_t dev = kdev->si_drv1;
  794         struct agp_softc *sc = device_get_softc(dev);
  795         struct agp_memory *mem;
  796 
  797         /*
  798          * Clear the GATT and force release on last close
  799          */
  800         while ((mem = TAILQ_FIRST(&sc->as_memory)) != NULL) {
  801                 if (mem->am_is_bound)
  802                         AGP_UNBIND_MEMORY(dev, mem);
  803                 AGP_FREE_MEMORY(dev, mem);
  804         }
  805         if (sc->as_state == AGP_ACQUIRE_USER)
  806                 agp_release_helper(dev, AGP_ACQUIRE_USER);
  807         if (sc->as_isopen) {
  808                 sc->as_isopen = 0;
  809                 device_unbusy(dev);
  810         }
  811 
  812         return 0;
  813 }
  814 
  815 static int
  816 agp_ioctl(struct dev_ioctl_args *ap)
  817 {
  818         cdev_t kdev = ap->a_head.a_dev;
  819         device_t dev = kdev->si_drv1;
  820 
  821         switch (ap->a_cmd) {
  822         case AGPIOC_INFO:
  823                 return agp_info_user(dev, (agp_info *)ap->a_data);
  824 
  825         case AGPIOC_ACQUIRE:
  826                 return agp_acquire_helper(dev, AGP_ACQUIRE_USER);
  827 
  828         case AGPIOC_RELEASE:
  829                 return agp_release_helper(dev, AGP_ACQUIRE_USER);
  830 
  831         case AGPIOC_SETUP:
  832                 return agp_setup_user(dev, (agp_setup *)ap->a_data);
  833 
  834         case AGPIOC_ALLOCATE:
  835                 return agp_allocate_user(dev, (agp_allocate *)ap->a_data);
  836 
  837         case AGPIOC_DEALLOCATE:
  838                 return agp_deallocate_user(dev, *(int *)ap->a_data);
  839 
  840         case AGPIOC_BIND:
  841                 return agp_bind_user(dev, (agp_bind *)ap->a_data);
  842 
  843         case AGPIOC_UNBIND:
  844                 return agp_unbind_user(dev, (agp_unbind *)ap->a_data);
  845 
  846         case AGPIOC_CHIPSET_FLUSH:
  847                 return agp_chipset_flush(dev);
  848         }
  849 
  850         return EINVAL;
  851 }
  852 
  853 static int
  854 agp_mmap(struct dev_mmap_args *ap)
  855 {
  856         cdev_t kdev = ap->a_head.a_dev;
  857         device_t dev = kdev->si_drv1;
  858         struct agp_softc *sc = device_get_softc(dev);
  859 
  860         if (ap->a_offset > AGP_GET_APERTURE(dev))
  861                 return EINVAL;
  862         ap->a_result = atop(rman_get_start(sc->as_aperture) + ap->a_offset);
  863         return 0;
  864 }
  865 
  866 /* Implementation of the kernel api */
  867 
  868 device_t
  869 agp_find_device(void)
  870 {
  871         device_t *children, child;
  872         int i, count;
  873 
  874         if (!agp_devclass)
  875                 return NULL;
  876         if (devclass_get_devices(agp_devclass, &children, &count) != 0)
  877                 return NULL;
  878         child = NULL;
  879         for (i = 0; i < count; i++) {
  880                 if (device_is_attached(children[i])) {
  881                         child = children[i];
  882                         break;
  883                 }
  884         }
  885         kfree(children, M_TEMP);
  886         return child;
  887 }
  888 
  889 enum agp_acquire_state
  890 agp_state(device_t dev)
  891 {
  892         struct agp_softc *sc = device_get_softc(dev);
  893         return sc->as_state;
  894 }
  895 
  896 void
  897 agp_get_info(device_t dev, struct agp_info *info)
  898 {
  899         struct agp_softc *sc = device_get_softc(dev);
  900 
  901         info->ai_mode =
  902                 pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  903         info->ai_aperture_base = rman_get_start(sc->as_aperture);
  904         info->ai_aperture_size = rman_get_size(sc->as_aperture);
  905         info->ai_memory_allowed = sc->as_maxmem;
  906         info->ai_memory_used = sc->as_allocated;
  907 }
  908 
  909 int
  910 agp_acquire(device_t dev)
  911 {
  912         return agp_acquire_helper(dev, AGP_ACQUIRE_KERNEL);
  913 }
  914 
  915 int
  916 agp_release(device_t dev)
  917 {
  918         return agp_release_helper(dev, AGP_ACQUIRE_KERNEL);
  919 }
  920 
  921 int
  922 agp_enable(device_t dev, u_int32_t mode)
  923 {
  924         return AGP_ENABLE(dev, mode);
  925 }
  926 
  927 void *agp_alloc_memory(device_t dev, int type, vm_size_t bytes)
  928 {
  929         return  (void *) AGP_ALLOC_MEMORY(dev, type, bytes);
  930 }
  931 
  932 void agp_free_memory(device_t dev, void *handle)
  933 {
  934         struct agp_memory *mem = (struct agp_memory *) handle;
  935         AGP_FREE_MEMORY(dev, mem);
  936 }
  937 
  938 int agp_bind_memory(device_t dev, void *handle, vm_offset_t offset)
  939 {
  940         struct agp_memory *mem = (struct agp_memory *) handle;
  941         return AGP_BIND_MEMORY(dev, mem, offset);
  942 }
  943 
  944 int agp_unbind_memory(device_t dev, void *handle)
  945 {
  946         struct agp_memory *mem = (struct agp_memory *) handle;
  947         return AGP_UNBIND_MEMORY(dev, mem);
  948 }
  949 
  950 void agp_memory_info(device_t dev, void *handle, struct
  951                      agp_memory_info *mi)
  952 {
  953         struct agp_memory *mem = (struct agp_memory *) handle;
  954 
  955         mi->ami_size = mem->am_size;
  956         mi->ami_physical = mem->am_physical;
  957         mi->ami_offset = mem->am_offset;
  958         mi->ami_is_bound = mem->am_is_bound;
  959 }
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FreeBSD/Linux Kernel Cross Reference sys/dev/agp/agp.c

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