agp.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
    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/5.2/sys/pci/agp.c 122513 2003-11-11 21:49:18Z anholt $");
   29 
   30 #include "opt_bus.h"
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/malloc.h>
   35 #include <sys/kernel.h>
   36 #include <sys/bus.h>
   37 #include <sys/conf.h>
   38 #include <sys/ioccom.h>
   39 #include <sys/agpio.h>
   40 #include <sys/lock.h>
   41 #include <sys/lockmgr.h>
   42 #include <sys/mutex.h>
   43 #include <sys/proc.h>
   44 
   45 #include <dev/pci/pcivar.h>
   46 #include <dev/pci/pcireg.h>
   47 #include <pci/agppriv.h>
   48 #include <pci/agpvar.h>
   49 #include <pci/agpreg.h>
   50 
   51 #include <vm/vm.h>
   52 #include <vm/vm_object.h>
   53 #include <vm/vm_page.h>
   54 #include <vm/vm_pageout.h>
   55 #include <vm/pmap.h>
   56 
   57 #include <machine/md_var.h>
   58 #include <machine/bus.h>
   59 #include <machine/resource.h>
   60 #include <sys/rman.h>
   61 
   62 MODULE_VERSION(agp, 1);
   63 
   64 MALLOC_DEFINE(M_AGP, "agp", "AGP data structures");
   65 
   66 #define CDEV_MAJOR      148
   67                                 /* agp_drv.c */
   68 static d_open_t agp_open;
   69 static d_close_t agp_close;
   70 static d_ioctl_t agp_ioctl;
   71 static d_mmap_t agp_mmap;
   72 
   73 static struct cdevsw agp_cdevsw = {
   74         .d_open =       agp_open,
   75         .d_close =      agp_close,
   76         .d_ioctl =      agp_ioctl,
   77         .d_mmap =       agp_mmap,
   78         .d_name =       "agp",
   79         .d_maj =        CDEV_MAJOR,
   80         .d_flags =      D_TTY,
   81 };
   82 
   83 static devclass_t agp_devclass;
   84 #define KDEV2DEV(kdev)  devclass_get_device(agp_devclass, minor(kdev))
   85 
   86 /* Helper functions for implementing chipset mini drivers. */
   87 
   88 void
   89 agp_flush_cache()
   90 {
   91 #ifdef __i386__
   92         wbinvd();
   93 #endif
   94 #ifdef __alpha__
   95         /* FIXME: This is most likely not correct as it doesn't flush CPU 
   96          * write caches, but we don't have a facility to do that and 
   97          * this is all linux does, too */
   98         alpha_mb();
   99 #endif
  100 }
  101 
  102 u_int8_t
  103 agp_find_caps(device_t dev)
  104 {
  105         u_int32_t status;
  106         u_int8_t ptr, next;
  107 
  108         /*
  109          * Check the CAP_LIST bit of the PCI status register first.
  110          */
  111         status = pci_read_config(dev, PCIR_STATUS, 2);
  112         if (!(status & 0x10))
  113                 return 0;
  114 
  115         /*
  116          * Traverse the capabilities list.
  117          */
  118         for (ptr = pci_read_config(dev, AGP_CAPPTR, 1);
  119              ptr != 0;
  120              ptr = next) {
  121                 u_int32_t capid = pci_read_config(dev, ptr, 4);
  122                 next = AGP_CAPID_GET_NEXT_PTR(capid);
  123 
  124                 /*
  125                  * If this capability entry ID is 2, then we are done.
  126                  */
  127                 if (AGP_CAPID_GET_CAP_ID(capid) == 2)
  128                         return ptr;
  129         }
  130 
  131         return 0;
  132 }
  133 
  134 /*
  135  * Find an AGP display device (if any).
  136  */
  137 static device_t
  138 agp_find_display(void)
  139 {
  140         devclass_t pci = devclass_find("pci");
  141         device_t bus, dev = 0;
  142         device_t *kids;
  143         int busnum, numkids, i;
  144 
  145         for (busnum = 0; busnum < devclass_get_maxunit(pci); busnum++) {
  146                 bus = devclass_get_device(pci, busnum);
  147                 if (!bus)
  148                         continue;
  149                 device_get_children(bus, &kids, &numkids);
  150                 for (i = 0; i < numkids; i++) {
  151                         dev = kids[i];
  152                         if (pci_get_class(dev) == PCIC_DISPLAY
  153                             && pci_get_subclass(dev) == PCIS_DISPLAY_VGA)
  154                                 if (agp_find_caps(dev)) {
  155                                         free(kids, M_TEMP);
  156                                         return dev;
  157                                 }
  158                                         
  159                 }
  160                 free(kids, M_TEMP);
  161         }
  162 
  163         return 0;
  164 }
  165 
  166 struct agp_gatt *
  167 agp_alloc_gatt(device_t dev)
  168 {
  169         u_int32_t apsize = AGP_GET_APERTURE(dev);
  170         u_int32_t entries = apsize >> AGP_PAGE_SHIFT;
  171         struct agp_gatt *gatt;
  172 
  173         if (bootverbose)
  174                 device_printf(dev,
  175                               "allocating GATT for aperture of size %dM\n",
  176                               apsize / (1024*1024));
  177 
  178         if (entries == 0) {
  179                 device_printf(dev, "bad aperture size\n");
  180                 return NULL;
  181         }
  182 
  183         gatt = malloc(sizeof(struct agp_gatt), M_AGP, M_NOWAIT);
  184         if (!gatt)
  185                 return 0;
  186 
  187         gatt->ag_entries = entries;
  188         gatt->ag_virtual = contigmalloc(entries * sizeof(u_int32_t), M_AGP, 0,
  189                                         0, ~0, PAGE_SIZE, 0);
  190         if (!gatt->ag_virtual) {
  191                 if (bootverbose)
  192                         device_printf(dev, "contiguous allocation failed\n");
  193                 free(gatt, M_AGP);
  194                 return 0;
  195         }
  196         bzero(gatt->ag_virtual, entries * sizeof(u_int32_t));
  197         gatt->ag_physical = vtophys((vm_offset_t) gatt->ag_virtual);
  198         agp_flush_cache();
  199 
  200         return gatt;
  201 }
  202 
  203 void
  204 agp_free_gatt(struct agp_gatt *gatt)
  205 {
  206         contigfree(gatt->ag_virtual,
  207                    gatt->ag_entries * sizeof(u_int32_t), M_AGP);
  208         free(gatt, M_AGP);
  209 }
  210 
  211 static int agp_max[][2] = {
  212         {0,     0},
  213         {32,    4},
  214         {64,    28},
  215         {128,   96},
  216         {256,   204},
  217         {512,   440},
  218         {1024,  942},
  219         {2048,  1920},
  220         {4096,  3932}
  221 };
  222 #define agp_max_size    (sizeof(agp_max) / sizeof(agp_max[0]))
  223 
  224 int
  225 agp_generic_attach(device_t dev)
  226 {
  227         struct agp_softc *sc = device_get_softc(dev);
  228         int rid, memsize, i;
  229 
  230         /*
  231          * Find and map the aperture.
  232          */
  233         rid = AGP_APBASE;
  234         sc->as_aperture = bus_alloc_resource(dev, SYS_RES_MEMORY, &rid,
  235                                              0, ~0, 1, RF_ACTIVE);
  236         if (!sc->as_aperture)
  237                 return ENOMEM;
  238 
  239         /*
  240          * Work out an upper bound for agp memory allocation. This
  241          * uses a heurisitc table from the Linux driver.
  242          */
  243         memsize = ptoa(Maxmem) >> 20;
  244         for (i = 0; i < agp_max_size; i++) {
  245                 if (memsize <= agp_max[i][0])
  246                         break;
  247         }
  248         if (i == agp_max_size) i = agp_max_size - 1;
  249         sc->as_maxmem = agp_max[i][1] << 20U;
  250 
  251         /*
  252          * The lock is used to prevent re-entry to
  253          * agp_generic_bind_memory() since that function can sleep.
  254          */
  255         lockinit(&sc->as_lock, PZERO|PCATCH, "agplk", 0, 0);
  256 
  257         /*
  258          * Initialise stuff for the userland device.
  259          */
  260         agp_devclass = devclass_find("agp");
  261         TAILQ_INIT(&sc->as_memory);
  262         sc->as_nextid = 1;
  263 
  264         sc->as_devnode = make_dev(&agp_cdevsw,
  265                                   device_get_unit(dev),
  266                                   UID_ROOT,
  267                                   GID_WHEEL,
  268                                   0600,
  269                                   "agpgart");
  270 
  271         return 0;
  272 }
  273 
  274 int
  275 agp_generic_detach(device_t dev)
  276 {
  277         struct agp_softc *sc = device_get_softc(dev);
  278         bus_release_resource(dev, SYS_RES_MEMORY, AGP_APBASE, sc->as_aperture);
  279         lockmgr(&sc->as_lock, LK_DRAIN, 0, curthread);
  280         lockdestroy(&sc->as_lock);
  281         destroy_dev(sc->as_devnode);
  282         agp_flush_cache();
  283         return 0;
  284 }
  285 
  286 /*
  287  * This does the enable logic for v3, with the same topology
  288  * restrictions as in place for v2 -- one bus, one device on the bus.
  289  */
  290 static int
  291 agp_v3_enable(device_t dev, device_t mdev, u_int32_t mode)
  292 {
  293         u_int32_t tstatus, mstatus;
  294         u_int32_t command;
  295         int rq, sba, fw, rate, arqsz, cal;
  296 
  297         tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  298         mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
  299 
  300         /* Set RQ to the min of mode, tstatus and mstatus */
  301         rq = AGP_MODE_GET_RQ(mode);
  302         if (AGP_MODE_GET_RQ(tstatus) < rq)
  303                 rq = AGP_MODE_GET_RQ(tstatus);
  304         if (AGP_MODE_GET_RQ(mstatus) < rq)
  305                 rq = AGP_MODE_GET_RQ(mstatus);
  306 
  307         /*
  308          * ARQSZ - Set the value to the maximum one.
  309          * Don't allow the mode register to override values.
  310          */
  311         arqsz = AGP_MODE_GET_ARQSZ(mode);
  312         if (AGP_MODE_GET_ARQSZ(tstatus) > rq)
  313                 rq = AGP_MODE_GET_ARQSZ(tstatus);
  314         if (AGP_MODE_GET_ARQSZ(mstatus) > rq)
  315                 rq = AGP_MODE_GET_ARQSZ(mstatus);
  316 
  317         /* Calibration cycle - don't allow override by mode register */
  318         cal = AGP_MODE_GET_CAL(tstatus);
  319         if (AGP_MODE_GET_CAL(mstatus) < cal)
  320                 cal = AGP_MODE_GET_CAL(mstatus);
  321 
  322         /* SBA must be supported for AGP v3. */
  323         sba = 1;
  324 
  325         /* Set FW if all three support it. */
  326         fw = (AGP_MODE_GET_FW(tstatus)
  327                & AGP_MODE_GET_FW(mstatus)
  328                & AGP_MODE_GET_FW(mode));
  329         
  330         /* Figure out the max rate */
  331         rate = (AGP_MODE_GET_RATE(tstatus)
  332                 & AGP_MODE_GET_RATE(mstatus)
  333                 & AGP_MODE_GET_RATE(mode));
  334         if (rate & AGP_MODE_V3_RATE_8x)
  335                 rate = AGP_MODE_V3_RATE_8x;
  336         else
  337                 rate = AGP_MODE_V3_RATE_4x;
  338         if (bootverbose)
  339                 device_printf(dev, "Setting AGP v3 mode %d\n", rate * 4);
  340 
  341         pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, 0, 4);
  342 
  343         /* Construct the new mode word and tell the hardware */
  344         command = AGP_MODE_SET_RQ(0, rq);
  345         command = AGP_MODE_SET_ARQSZ(command, arqsz);
  346         command = AGP_MODE_SET_CAL(command, cal);
  347         command = AGP_MODE_SET_SBA(command, sba);
  348         command = AGP_MODE_SET_FW(command, fw);
  349         command = AGP_MODE_SET_RATE(command, rate);
  350         command = AGP_MODE_SET_AGP(command, 1);
  351         pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4);
  352         pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4);
  353 
  354         return 0;
  355 }
  356 
  357 static int
  358 agp_v2_enable(device_t dev, device_t mdev, u_int32_t mode)
  359 {
  360         u_int32_t tstatus, mstatus;
  361         u_int32_t command;
  362         int rq, sba, fw, rate;
  363 
  364         tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  365         mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
  366 
  367         /* Set RQ to the min of mode, tstatus and mstatus */
  368         rq = AGP_MODE_GET_RQ(mode);
  369         if (AGP_MODE_GET_RQ(tstatus) < rq)
  370                 rq = AGP_MODE_GET_RQ(tstatus);
  371         if (AGP_MODE_GET_RQ(mstatus) < rq)
  372                 rq = AGP_MODE_GET_RQ(mstatus);
  373 
  374         /* Set SBA if all three can deal with SBA */
  375         sba = (AGP_MODE_GET_SBA(tstatus)
  376                & AGP_MODE_GET_SBA(mstatus)
  377                & AGP_MODE_GET_SBA(mode));
  378 
  379         /* Similar for FW */
  380         fw = (AGP_MODE_GET_FW(tstatus)
  381                & AGP_MODE_GET_FW(mstatus)
  382                & AGP_MODE_GET_FW(mode));
  383 
  384         /* Figure out the max rate */
  385         rate = (AGP_MODE_GET_RATE(tstatus)
  386                 & AGP_MODE_GET_RATE(mstatus)
  387                 & AGP_MODE_GET_RATE(mode));
  388         if (rate & AGP_MODE_V2_RATE_4x)
  389                 rate = AGP_MODE_V2_RATE_4x;
  390         else if (rate & AGP_MODE_V2_RATE_2x)
  391                 rate = AGP_MODE_V2_RATE_2x;
  392         else
  393                 rate = AGP_MODE_V2_RATE_1x;
  394         if (bootverbose)
  395                 device_printf(dev, "Setting AGP v2 mode %d\n", rate);
  396 
  397         /* Construct the new mode word and tell the hardware */
  398         command = AGP_MODE_SET_RQ(0, rq);
  399         command = AGP_MODE_SET_SBA(command, sba);
  400         command = AGP_MODE_SET_FW(command, fw);
  401         command = AGP_MODE_SET_RATE(command, rate);
  402         command = AGP_MODE_SET_AGP(command, 1);
  403         pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4);
  404         pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4);
  405 
  406         return 0;
  407 }
  408 
  409 int
  410 agp_generic_enable(device_t dev, u_int32_t mode)
  411 {
  412         device_t mdev = agp_find_display();
  413         u_int32_t tstatus, mstatus;
  414 
  415         if (!mdev) {
  416                 AGP_DPF("can't find display\n");
  417                 return ENXIO;
  418         }
  419 
  420         tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  421         mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
  422 
  423         /*
  424          * Check display and bridge for AGP v3 support.  AGP v3 allows
  425          * more variety in topology than v2, e.g. multiple AGP devices
  426          * attached to one bridge, or multiple AGP bridges in one
  427          * system.  This doesn't attempt to address those situations,
  428          * but should work fine for a classic single AGP slot system
  429          * with AGP v3.
  430          */
  431         if (AGP_MODE_GET_MODE_3(tstatus) && AGP_MODE_GET_MODE_3(mstatus))
  432                 return (agp_v3_enable(dev, mdev, mode));
  433         else
  434                 return (agp_v2_enable(dev, mdev, mode));            
  435 }
  436 
  437 struct agp_memory *
  438 agp_generic_alloc_memory(device_t dev, int type, vm_size_t size)
  439 {
  440         struct agp_softc *sc = device_get_softc(dev);
  441         struct agp_memory *mem;
  442 
  443         if ((size & (AGP_PAGE_SIZE - 1)) != 0)
  444                 return 0;
  445 
  446         if (sc->as_allocated + size > sc->as_maxmem)
  447                 return 0;
  448 
  449         if (type != 0) {
  450                 printf("agp_generic_alloc_memory: unsupported type %d\n",
  451                        type);
  452                 return 0;
  453         }
  454 
  455         mem = malloc(sizeof *mem, M_AGP, M_WAITOK);
  456         mem->am_id = sc->as_nextid++;
  457         mem->am_size = size;
  458         mem->am_type = 0;
  459         mem->am_obj = vm_object_allocate(OBJT_DEFAULT, atop(round_page(size)));
  460         mem->am_physical = 0;
  461         mem->am_offset = 0;
  462         mem->am_is_bound = 0;
  463         TAILQ_INSERT_TAIL(&sc->as_memory, mem, am_link);
  464         sc->as_allocated += size;
  465 
  466         return mem;
  467 }
  468 
  469 int
  470 agp_generic_free_memory(device_t dev, struct agp_memory *mem)
  471 {
  472         struct agp_softc *sc = device_get_softc(dev);
  473 
  474         if (mem->am_is_bound)
  475                 return EBUSY;
  476 
  477         sc->as_allocated -= mem->am_size;
  478         TAILQ_REMOVE(&sc->as_memory, mem, am_link);
  479         vm_object_deallocate(mem->am_obj);
  480         free(mem, M_AGP);
  481         return 0;
  482 }
  483 
  484 int
  485 agp_generic_bind_memory(device_t dev, struct agp_memory *mem,
  486                         vm_offset_t offset)
  487 {
  488         struct agp_softc *sc = device_get_softc(dev);
  489         vm_offset_t i, j, k;
  490         vm_page_t m;
  491         int error;
  492 
  493         lockmgr(&sc->as_lock, LK_EXCLUSIVE, 0, curthread);
  494 
  495         if (mem->am_is_bound) {
  496                 device_printf(dev, "memory already bound\n");
  497                 return EINVAL;
  498         }
  499         
  500         if (offset < 0
  501             || (offset & (AGP_PAGE_SIZE - 1)) != 0
  502             || offset + mem->am_size > AGP_GET_APERTURE(dev)) {
  503                 device_printf(dev, "binding memory at bad offset %#x\n",
  504                               (int) offset);
  505                 return EINVAL;
  506         }
  507 
  508         /*
  509          * Bind the individual pages and flush the chipset's
  510          * TLB.
  511          *
  512          * XXX Presumably, this needs to be the pci address on alpha
  513          * (i.e. use alpha_XXX_dmamap()). I don't have access to any
  514          * alpha AGP hardware to check.
  515          */
  516         for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
  517                 /*
  518                  * Find a page from the object and wire it
  519                  * down. This page will be mapped using one or more
  520                  * entries in the GATT (assuming that PAGE_SIZE >=
  521                  * AGP_PAGE_SIZE. If this is the first call to bind,
  522                  * the pages will be allocated and zeroed.
  523                  */
  524                 VM_OBJECT_LOCK(mem->am_obj);
  525                 m = vm_page_grab(mem->am_obj, OFF_TO_IDX(i),
  526                     VM_ALLOC_WIRED | VM_ALLOC_ZERO | VM_ALLOC_RETRY);
  527                 VM_OBJECT_UNLOCK(mem->am_obj);
  528                 if ((m->flags & PG_ZERO) == 0)
  529                         pmap_zero_page(m);
  530                 AGP_DPF("found page pa=%#x\n", VM_PAGE_TO_PHYS(m));
  531 
  532                 /*
  533                  * Install entries in the GATT, making sure that if
  534                  * AGP_PAGE_SIZE < PAGE_SIZE and mem->am_size is not
  535                  * aligned to PAGE_SIZE, we don't modify too many GATT 
  536                  * entries.
  537                  */
  538                 for (j = 0; j < PAGE_SIZE && i + j < mem->am_size;
  539                      j += AGP_PAGE_SIZE) {
  540                         vm_offset_t pa = VM_PAGE_TO_PHYS(m) + j;
  541                         AGP_DPF("binding offset %#x to pa %#x\n",
  542                                 offset + i + j, pa);
  543                         error = AGP_BIND_PAGE(dev, offset + i + j, pa);
  544                         if (error) {
  545                                 /*
  546                                  * Bail out. Reverse all the mappings
  547                                  * and unwire the pages.
  548                                  */
  549                                 vm_page_lock_queues();
  550                                 vm_page_wakeup(m);
  551                                 vm_page_unlock_queues();
  552                                 for (k = 0; k < i + j; k += AGP_PAGE_SIZE)
  553                                         AGP_UNBIND_PAGE(dev, offset + k);
  554                                 VM_OBJECT_LOCK(mem->am_obj);
  555                                 for (k = 0; k <= i; k += PAGE_SIZE) {
  556                                         m = vm_page_lookup(mem->am_obj,
  557                                                            OFF_TO_IDX(k));
  558                                         vm_page_lock_queues();
  559                                         vm_page_unwire(m, 0);
  560                                         vm_page_unlock_queues();
  561                                 }
  562                                 VM_OBJECT_UNLOCK(mem->am_obj);
  563                                 lockmgr(&sc->as_lock, LK_RELEASE, 0, curthread);
  564                                 return error;
  565                         }
  566                 }
  567                 vm_page_lock_queues();
  568                 vm_page_wakeup(m);
  569                 vm_page_unlock_queues();
  570         }
  571 
  572         /*
  573          * Flush the cpu cache since we are providing a new mapping
  574          * for these pages.
  575          */
  576         agp_flush_cache();
  577 
  578         /*
  579          * Make sure the chipset gets the new mappings.
  580          */
  581         AGP_FLUSH_TLB(dev);
  582 
  583         mem->am_offset = offset;
  584         mem->am_is_bound = 1;
  585 
  586         lockmgr(&sc->as_lock, LK_RELEASE, 0, curthread);
  587 
  588         return 0;
  589 }
  590 
  591 int
  592 agp_generic_unbind_memory(device_t dev, struct agp_memory *mem)
  593 {
  594         struct agp_softc *sc = device_get_softc(dev);
  595         vm_page_t m;
  596         int i;
  597 
  598         lockmgr(&sc->as_lock, LK_EXCLUSIVE, 0, curthread);
  599 
  600         if (!mem->am_is_bound) {
  601                 device_printf(dev, "memory is not bound\n");
  602                 return EINVAL;
  603         }
  604 
  605 
  606         /*
  607          * Unbind the individual pages and flush the chipset's
  608          * TLB. Unwire the pages so they can be swapped.
  609          */
  610         for (i = 0; i < mem->am_size; i += AGP_PAGE_SIZE)
  611                 AGP_UNBIND_PAGE(dev, mem->am_offset + i);
  612         VM_OBJECT_LOCK(mem->am_obj);
  613         for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
  614                 m = vm_page_lookup(mem->am_obj, atop(i));
  615                 vm_page_lock_queues();
  616                 vm_page_unwire(m, 0);
  617                 vm_page_unlock_queues();
  618         }
  619         VM_OBJECT_UNLOCK(mem->am_obj);
  620                 
  621         agp_flush_cache();
  622         AGP_FLUSH_TLB(dev);
  623 
  624         mem->am_offset = 0;
  625         mem->am_is_bound = 0;
  626 
  627         lockmgr(&sc->as_lock, LK_RELEASE, 0, curthread);
  628 
  629         return 0;
  630 }
  631 
  632 /* Helper functions for implementing user/kernel api */
  633 
  634 static int
  635 agp_acquire_helper(device_t dev, enum agp_acquire_state state)
  636 {
  637         struct agp_softc *sc = device_get_softc(dev);
  638 
  639         if (sc->as_state != AGP_ACQUIRE_FREE)
  640                 return EBUSY;
  641         sc->as_state = state;
  642 
  643         return 0;
  644 }
  645 
  646 static int
  647 agp_release_helper(device_t dev, enum agp_acquire_state state)
  648 {
  649         struct agp_softc *sc = device_get_softc(dev);
  650 
  651         if (sc->as_state == AGP_ACQUIRE_FREE)
  652                 return 0;
  653 
  654         if (sc->as_state != state)
  655                 return EBUSY;
  656 
  657         sc->as_state = AGP_ACQUIRE_FREE;
  658         return 0;
  659 }
  660 
  661 static struct agp_memory *
  662 agp_find_memory(device_t dev, int id)
  663 {
  664         struct agp_softc *sc = device_get_softc(dev);
  665         struct agp_memory *mem;
  666 
  667         AGP_DPF("searching for memory block %d\n", id);
  668         TAILQ_FOREACH(mem, &sc->as_memory, am_link) {
  669                 AGP_DPF("considering memory block %d\n", mem->am_id);
  670                 if (mem->am_id == id)
  671                         return mem;
  672         }
  673         return 0;
  674 }
  675 
  676 /* Implementation of the userland ioctl api */
  677 
  678 static int
  679 agp_info_user(device_t dev, agp_info *info)
  680 {
  681         struct agp_softc *sc = device_get_softc(dev);
  682 
  683         bzero(info, sizeof *info);
  684         info->bridge_id = pci_get_devid(dev);
  685         info->agp_mode = 
  686             pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  687         info->aper_base = rman_get_start(sc->as_aperture);
  688         info->aper_size = AGP_GET_APERTURE(dev) >> 20;
  689         info->pg_total = info->pg_system = sc->as_maxmem >> AGP_PAGE_SHIFT;
  690         info->pg_used = sc->as_allocated >> AGP_PAGE_SHIFT;
  691 
  692         return 0;
  693 }
  694 
  695 static int
  696 agp_setup_user(device_t dev, agp_setup *setup)
  697 {
  698         return AGP_ENABLE(dev, setup->agp_mode);
  699 }
  700 
  701 static int
  702 agp_allocate_user(device_t dev, agp_allocate *alloc)
  703 {
  704         struct agp_memory *mem;
  705 
  706         mem = AGP_ALLOC_MEMORY(dev,
  707                                alloc->type,
  708                                alloc->pg_count << AGP_PAGE_SHIFT);
  709         if (mem) {
  710                 alloc->key = mem->am_id;
  711                 alloc->physical = mem->am_physical;
  712                 return 0;
  713         } else {
  714                 return ENOMEM;
  715         }
  716 }
  717 
  718 static int
  719 agp_deallocate_user(device_t dev, int id)
  720 {
  721         struct agp_memory *mem = agp_find_memory(dev, id);;
  722 
  723         if (mem) {
  724                 AGP_FREE_MEMORY(dev, mem);
  725                 return 0;
  726         } else {
  727                 return ENOENT;
  728         }
  729 }
  730 
  731 static int
  732 agp_bind_user(device_t dev, agp_bind *bind)
  733 {
  734         struct agp_memory *mem = agp_find_memory(dev, bind->key);
  735 
  736         if (!mem)
  737                 return ENOENT;
  738 
  739         return AGP_BIND_MEMORY(dev, mem, bind->pg_start << AGP_PAGE_SHIFT);
  740 }
  741 
  742 static int
  743 agp_unbind_user(device_t dev, agp_unbind *unbind)
  744 {
  745         struct agp_memory *mem = agp_find_memory(dev, unbind->key);
  746 
  747         if (!mem)
  748                 return ENOENT;
  749 
  750         return AGP_UNBIND_MEMORY(dev, mem);
  751 }
  752 
  753 static int
  754 agp_open(dev_t kdev, int oflags, int devtype, struct thread *td)
  755 {
  756         device_t dev = KDEV2DEV(kdev);
  757         struct agp_softc *sc = device_get_softc(dev);
  758 
  759         if (!sc->as_isopen) {
  760                 sc->as_isopen = 1;
  761                 device_busy(dev);
  762         }
  763 
  764         return 0;
  765 }
  766 
  767 static int
  768 agp_close(dev_t kdev, int fflag, int devtype, struct thread *td)
  769 {
  770         device_t dev = KDEV2DEV(kdev);
  771         struct agp_softc *sc = device_get_softc(dev);
  772         struct agp_memory *mem;
  773 
  774         /*
  775          * Clear the GATT and force release on last close
  776          */
  777         while ((mem = TAILQ_FIRST(&sc->as_memory)) != 0) {
  778                 if (mem->am_is_bound)
  779                         AGP_UNBIND_MEMORY(dev, mem);
  780                 AGP_FREE_MEMORY(dev, mem);
  781         }
  782         if (sc->as_state == AGP_ACQUIRE_USER)
  783                 agp_release_helper(dev, AGP_ACQUIRE_USER);
  784         sc->as_isopen = 0;
  785         device_unbusy(dev);
  786 
  787         return 0;
  788 }
  789 
  790 static int
  791 agp_ioctl(dev_t kdev, u_long cmd, caddr_t data, int fflag, struct thread *td)
  792 {
  793         device_t dev = KDEV2DEV(kdev);
  794 
  795         switch (cmd) {
  796         case AGPIOC_INFO:
  797                 return agp_info_user(dev, (agp_info *) data);
  798 
  799         case AGPIOC_ACQUIRE:
  800                 return agp_acquire_helper(dev, AGP_ACQUIRE_USER);
  801 
  802         case AGPIOC_RELEASE:
  803                 return agp_release_helper(dev, AGP_ACQUIRE_USER);
  804 
  805         case AGPIOC_SETUP:
  806                 return agp_setup_user(dev, (agp_setup *)data);
  807 
  808         case AGPIOC_ALLOCATE:
  809                 return agp_allocate_user(dev, (agp_allocate *)data);
  810 
  811         case AGPIOC_DEALLOCATE:
  812                 return agp_deallocate_user(dev, *(int *) data);
  813 
  814         case AGPIOC_BIND:
  815                 return agp_bind_user(dev, (agp_bind *)data);
  816 
  817         case AGPIOC_UNBIND:
  818                 return agp_unbind_user(dev, (agp_unbind *)data);
  819 
  820         }
  821 
  822         return EINVAL;
  823 }
  824 
  825 static int
  826 agp_mmap(dev_t kdev, vm_offset_t offset, vm_paddr_t *paddr, int prot)
  827 {
  828         device_t dev = KDEV2DEV(kdev);
  829         struct agp_softc *sc = device_get_softc(dev);
  830 
  831         if (offset > AGP_GET_APERTURE(dev))
  832                 return -1;
  833         *paddr = rman_get_start(sc->as_aperture) + offset;
  834         return 0;
  835 }
  836 
  837 /* Implementation of the kernel api */
  838 
  839 device_t
  840 agp_find_device()
  841 {
  842         if (!agp_devclass)
  843                 return 0;
  844         return devclass_get_device(agp_devclass, 0);
  845 }
  846 
  847 enum agp_acquire_state
  848 agp_state(device_t dev)
  849 {
  850         struct agp_softc *sc = device_get_softc(dev);
  851         return sc->as_state;
  852 }
  853 
  854 void
  855 agp_get_info(device_t dev, struct agp_info *info)
  856 {
  857         struct agp_softc *sc = device_get_softc(dev);
  858 
  859         info->ai_mode =
  860                 pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
  861         info->ai_aperture_base = rman_get_start(sc->as_aperture);
  862         info->ai_aperture_size = rman_get_size(sc->as_aperture);
  863         info->ai_aperture_va = (vm_offset_t) rman_get_virtual(sc->as_aperture);
  864         info->ai_memory_allowed = sc->as_maxmem;
  865         info->ai_memory_used = sc->as_allocated;
  866 }
  867 
  868 int
  869 agp_acquire(device_t dev)
  870 {
  871         return agp_acquire_helper(dev, AGP_ACQUIRE_KERNEL);
  872 }
  873 
  874 int
  875 agp_release(device_t dev)
  876 {
  877         return agp_release_helper(dev, AGP_ACQUIRE_KERNEL);
  878 }
  879 
  880 int
  881 agp_enable(device_t dev, u_int32_t mode)
  882 {
  883         return AGP_ENABLE(dev, mode);
  884 }
  885 
  886 void *agp_alloc_memory(device_t dev, int type, vm_size_t bytes)
  887 {
  888         return  (void *) AGP_ALLOC_MEMORY(dev, type, bytes);
  889 }
  890 
  891 void agp_free_memory(device_t dev, void *handle)
  892 {
  893         struct agp_memory *mem = (struct agp_memory *) handle;
  894         AGP_FREE_MEMORY(dev, mem);
  895 }
  896 
  897 int agp_bind_memory(device_t dev, void *handle, vm_offset_t offset)
  898 {
  899         struct agp_memory *mem = (struct agp_memory *) handle;
  900         return AGP_BIND_MEMORY(dev, mem, offset);
  901 }
  902 
  903 int agp_unbind_memory(device_t dev, void *handle)
  904 {
  905         struct agp_memory *mem = (struct agp_memory *) handle;
  906         return AGP_UNBIND_MEMORY(dev, mem);
  907 }
  908 
  909 void agp_memory_info(device_t dev, void *handle, struct
  910                      agp_memory_info *mi)
  911 {
  912         struct agp_memory *mem = (struct agp_memory *) handle;
  913 
  914         mi->ami_size = mem->am_size;
  915         mi->ami_physical = mem->am_physical;
  916         mi->ami_offset = mem->am_offset;
  917         mi->ami_is_bound = mem->am_is_bound;
  918 }
Cache object: 1953f5b195f3f122bbc9167b48a64059
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.
FreeBSD/Linux Kernel Cross Reference sys/pci/agp.c

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