sys/dev/pci/pci_usrreq.c

   1 /*      $NetBSD: pci_usrreq.c,v 1.21 2009/07/14 19:54:40 macallan Exp $ */
   2
   3 /*
   4  * Copyright 2001 Wasabi Systems, Inc.
   5  * All rights reserved.
   6  *
   7  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed for the NetBSD Project by
  20  *      Wasabi Systems, Inc.
  21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
  22  *    or promote products derived from this software without specific prior
  23  *    written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
  29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  35  * POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 /*
  39  * User -> kernel interface for PCI bus access.
  40  */
  41
  42 #include <sys/cdefs.h>
  43 __KERNEL_RCSID(0, "$NetBSD: pci_usrreq.c,v 1.21 2009/07/14 19:54:40 macallan Exp $");
  44
  45 #include <sys/param.h>
  46 #include <sys/conf.h>
  47 #include <sys/device.h>
  48 #include <sys/ioctl.h>
  49 #include <sys/proc.h>
  50 #include <sys/systm.h>
  51 #include <sys/errno.h>
  52 #include <sys/fcntl.h>
  53 #include <sys/kauth.h>
  54
  55 #include <dev/pci/pcireg.h>
  56 #include <dev/pci/pcivar.h>
  57 #include <dev/pci/pciio.h>
  58
  59 #include "opt_pci.h"
  60
  61 static int
  62 pciopen(dev_t dev, int flags, int mode, struct lwp *l)
  63 {
  64         device_t dv;
  65
  66         dv = device_lookup(&pci_cd, minor(dev));
  67         if (dv == NULL)
  68                 return ENXIO;
  69
  70         return 0;
  71 }
  72
  73 static int
  74 pciioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
  75 {
  76         struct pci_softc *sc = device_lookup_private(&pci_cd, minor(dev));
  77         struct pciio_bdf_cfgreg *bdfr;
  78         struct pciio_businfo *binfo;
  79         pcitag_t tag;
  80
  81         switch (cmd) {
  82         case PCI_IOC_BDF_CFGREAD:
  83         case PCI_IOC_BDF_CFGWRITE:
  84                 bdfr = data;
  85                 if (bdfr->bus > 255 || bdfr->device >= sc->sc_maxndevs ||
  86                     bdfr->function > 7)
  87                         return EINVAL;
  88                 tag = pci_make_tag(sc->sc_pc, bdfr->bus, bdfr->device,
  89                     bdfr->function);
  90
  91                 if (cmd == PCI_IOC_BDF_CFGREAD) {
  92                         bdfr->cfgreg.val = pci_conf_read(sc->sc_pc, tag,
  93                             bdfr->cfgreg.reg);
  94                 } else {
  95                         if ((flag & FWRITE) == 0)
  96                                 return EBADF;
  97                         pci_conf_write(sc->sc_pc, tag, bdfr->cfgreg.reg,
  98                             bdfr->cfgreg.val);
  99                 }
 100                 return 0;
 101
 102         case PCI_IOC_BUSINFO:
 103                 binfo = data;
 104                 binfo->busno = sc->sc_bus;
 105                 binfo->maxdevs = sc->sc_maxndevs;
 106                 return 0;
 107
 108         default:
 109                 return ENOTTY;
 110         }
 111 }
 112
 113 static paddr_t
 114 pcimmap(dev_t dev, off_t offset, int prot)
 115 {
 116         struct pci_softc *sc = device_lookup_private(&pci_cd, minor(dev));
 117
 118         if (kauth_authorize_generic(kauth_cred_get(), KAUTH_GENERIC_ISSUSER,
 119             NULL) != 0) {
 120                 return -1;
 121         }
 122         /*
 123          * Since we allow mapping of the entire bus, we
 124          * take the offset to be the address on the bus,
 125          * and pass 0 as the offset into that range.
 126          *
 127          * XXX Need a way to deal with linear/prefetchable/etc.
 128          *
 129          * XXX we rely on MD mmap() methods to enforce limits since these
 130          * are hidden in *_tag_t structs if they exist at all
 131          */
 132
 133 #ifdef PCI_MAGIC_IO_RANGE
 134         /*
 135          * first, check if someone's trying to map the IO range
 136          * XXX this assumes 64kB IO space even though some machines can have
 137          * significantly more than that - macppc's bandit host bridge allows
 138          * 8MB IO space and sparc64 may have the entire 4GB available. The
 139          * firmware on both tries to use the lower 64kB first though and
 140          * exausting it is pretty difficult so we should be safe
 141          */
 142         if ((offset >= PCI_MAGIC_IO_RANGE) &&
 143             (offset < (PCI_MAGIC_IO_RANGE + 0x10000))) {
 144                 return bus_space_mmap(sc->sc_iot, offset - PCI_MAGIC_IO_RANGE,
 145                     0, prot, 0);
 146         }
 147 #endif /* PCI_MAGIC_IO_RANGE */
 148         return bus_space_mmap(sc->sc_memt, offset, 0, prot, 0);
 149 }
 150
 151 const struct cdevsw pci_cdevsw = {
 152         pciopen, nullclose, noread, nowrite, pciioctl,
 153         nostop, notty, nopoll, pcimmap, nokqfilter, D_OTHER,
 154 };
 155
 156 /*
 157  * pci_devioctl:
 158  *
 159  *      PCI ioctls that can be performed on devices directly.
 160  */
 161 int
 162 pci_devioctl(pci_chipset_tag_t pc, pcitag_t tag, u_long cmd, void *data,
 163     int flag, struct lwp *l)
 164 {
 165         struct pciio_cfgreg *r = (void *) data;
 166
 167         switch (cmd) {
 168         case PCI_IOC_CFGREAD:
 169                 r->val = pci_conf_read(pc, tag, r->reg);
 170                 break;
 171
 172         case PCI_IOC_CFGWRITE:
 173                 if ((flag & FWRITE) == 0)
 174                         return EBADF;
 175                 pci_conf_write(pc, tag, r->reg, r->val);
 176                 break;
 177
 178         default:
 179                 return EPASSTHROUGH;
 180         }
 181
 182         return 0;
 183 }