| 1 | /* $NetBSD: pci_usrreq.c,v 1.30 2016/09/24 23:12:54 mrg 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 1.30 2016/09/24 23:12:54 mrg Exp $" ); |
| 44 | |
| 45 | #ifdef _KERNEL_OPT |
| 46 | #include "opt_pci.h" |
| 47 | #endif |
| 48 | |
| 49 | #include <sys/param.h> |
| 50 | #include <sys/conf.h> |
| 51 | #include <sys/device.h> |
| 52 | #include <sys/ioctl.h> |
| 53 | #include <sys/proc.h> |
| 54 | #include <sys/systm.h> |
| 55 | #include <sys/errno.h> |
| 56 | #include <sys/fcntl.h> |
| 57 | #include <sys/kauth.h> |
| 58 | |
| 59 | #include <dev/pci/pcireg.h> |
| 60 | #include <dev/pci/pcivar.h> |
| 61 | #include <dev/pci/pciio.h> |
| 62 | |
| 63 | static int |
| 64 | pciopen(dev_t dev, int flags, int mode, struct lwp *l) |
| 65 | { |
| 66 | device_t dv; |
| 67 | |
| 68 | dv = device_lookup(&pci_cd, minor(dev)); |
| 69 | if (dv == NULL) |
| 70 | return ENXIO; |
| 71 | |
| 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | static int |
| 76 | pciioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) |
| 77 | { |
| 78 | struct pci_softc *sc = device_lookup_private(&pci_cd, minor(dev)); |
| 79 | struct pci_child *child; |
| 80 | struct pciio_bdf_cfgreg *bdfr; |
| 81 | struct pciio_businfo *binfo; |
| 82 | struct pciio_drvname *dname; |
| 83 | struct pciio_drvnameonbus *dnameonbus; |
| 84 | pcitag_t tag; |
| 85 | |
| 86 | switch (cmd) { |
| 87 | case PCI_IOC_BDF_CFGREAD: |
| 88 | case PCI_IOC_BDF_CFGWRITE: |
| 89 | bdfr = data; |
| 90 | if (bdfr->bus > 255 || bdfr->device >= sc->sc_maxndevs || |
| 91 | bdfr->function > 7 || ISSET(bdfr->cfgreg.reg, 3)) |
| 92 | return EINVAL; |
| 93 | tag = pci_make_tag(sc->sc_pc, bdfr->bus, bdfr->device, |
| 94 | bdfr->function); |
| 95 | |
| 96 | if (cmd == PCI_IOC_BDF_CFGREAD) { |
| 97 | bdfr->cfgreg.val = pci_conf_read(sc->sc_pc, tag, |
| 98 | bdfr->cfgreg.reg); |
| 99 | } else { |
| 100 | if ((flag & FWRITE) == 0) |
| 101 | return EBADF; |
| 102 | pci_conf_write(sc->sc_pc, tag, bdfr->cfgreg.reg, |
| 103 | bdfr->cfgreg.val); |
| 104 | } |
| 105 | return 0; |
| 106 | |
| 107 | case PCI_IOC_BUSINFO: |
| 108 | binfo = data; |
| 109 | binfo->busno = sc->sc_bus; |
| 110 | binfo->maxdevs = sc->sc_maxndevs; |
| 111 | return 0; |
| 112 | |
| 113 | case PCI_IOC_DRVNAME: |
| 114 | dname = data; |
| 115 | if (dname->device >= sc->sc_maxndevs || dname->function > 7) |
| 116 | return EINVAL; |
| 117 | child = &sc->PCI_SC_DEVICESC(dname->device, dname->function); |
| 118 | if (!child->c_dev) |
| 119 | return ENXIO; |
| 120 | strlcpy(dname->name, device_xname(child->c_dev), |
| 121 | sizeof dname->name); |
| 122 | return 0; |
| 123 | |
| 124 | case PCI_IOC_DRVNAMEONBUS: |
| 125 | dnameonbus = data; |
| 126 | int i; |
| 127 | |
| 128 | for (i = 0; i < pci_cd.cd_ndevs; i++) { |
| 129 | sc = device_lookup_private(&pci_cd, i); |
| 130 | if (sc->sc_bus == dnameonbus->bus) |
| 131 | break; /* found the right bus */ |
| 132 | } |
| 133 | if (i == pci_cd.cd_ndevs || sc == NULL) |
| 134 | return ENXIO; |
| 135 | if (dnameonbus->device >= sc->sc_maxndevs || |
| 136 | dnameonbus->function > 7) |
| 137 | return EINVAL; |
| 138 | |
| 139 | child = &sc->PCI_SC_DEVICESC(dnameonbus->device, |
| 140 | dnameonbus->function); |
| 141 | if (!child->c_dev) |
| 142 | return ENXIO; |
| 143 | strlcpy(dnameonbus->name, device_xname(child->c_dev), |
| 144 | sizeof dnameonbus->name); |
| 145 | return 0; |
| 146 | |
| 147 | default: |
| 148 | return ENOTTY; |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | static paddr_t |
| 153 | pcimmap(dev_t dev, off_t offset, int prot) |
| 154 | { |
| 155 | struct pci_softc *sc = device_lookup_private(&pci_cd, minor(dev)); |
| 156 | struct pci_child *c; |
| 157 | struct pci_range *r; |
| 158 | int flags = 0; |
| 159 | int device, range; |
| 160 | |
| 161 | if (kauth_authorize_machdep(kauth_cred_get(), KAUTH_MACHDEP_UNMANAGEDMEM, |
| 162 | NULL, NULL, NULL, NULL) != 0) { |
| 163 | return -1; |
| 164 | } |
| 165 | /* |
| 166 | * Since we allow mapping of the entire bus, we |
| 167 | * take the offset to be the address on the bus, |
| 168 | * and pass 0 as the offset into that range. |
| 169 | * |
| 170 | * XXX Need a way to deal with linear/etc. |
| 171 | * |
| 172 | * XXX we rely on MD mmap() methods to enforce limits since these |
| 173 | * are hidden in *_tag_t structs if they exist at all |
| 174 | */ |
| 175 | |
| 176 | #ifdef PCI_MAGIC_IO_RANGE |
| 177 | /* |
| 178 | * first, check if someone's trying to map the IO range |
| 179 | * XXX this assumes 64kB IO space even though some machines can have |
| 180 | * significantly more than that - macppc's bandit host bridge allows |
| 181 | * 8MB IO space and sparc64 may have the entire 4GB available. The |
| 182 | * firmware on both tries to use the lower 64kB first though and |
| 183 | * exausting it is pretty difficult so we should be safe |
| 184 | */ |
| 185 | if ((offset >= PCI_MAGIC_IO_RANGE) && |
| 186 | (offset < (PCI_MAGIC_IO_RANGE + 0x10000))) { |
| 187 | return bus_space_mmap(sc->sc_iot, offset - PCI_MAGIC_IO_RANGE, |
| 188 | 0, prot, 0); |
| 189 | } |
| 190 | #endif /* PCI_MAGIC_IO_RANGE */ |
| 191 | |
| 192 | for (device = 0; device < __arraycount(sc->sc_devices); device++) { |
| 193 | c = &sc->sc_devices[device]; |
| 194 | if (c->c_dev == NULL) |
| 195 | continue; |
| 196 | for (range = 0; range < __arraycount(c->c_range); range++) { |
| 197 | r = &c->c_range[range]; |
| 198 | if (r->r_size == 0) |
| 199 | break; |
| 200 | if (offset >= r->r_offset && |
| 201 | offset < r->r_offset + r->r_size) { |
| 202 | flags = r->r_flags; |
| 203 | break; |
| 204 | } |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | return bus_space_mmap(sc->sc_memt, offset, 0, prot, flags); |
| 209 | } |
| 210 | |
| 211 | const struct cdevsw pci_cdevsw = { |
| 212 | .d_open = pciopen, |
| 213 | .d_close = nullclose, |
| 214 | .d_read = noread, |
| 215 | .d_write = nowrite, |
| 216 | .d_ioctl = pciioctl, |
| 217 | .d_stop = nostop, |
| 218 | .d_tty = notty, |
| 219 | .d_poll = nopoll, |
| 220 | .d_mmap = pcimmap, |
| 221 | .d_kqfilter = nokqfilter, |
| 222 | .d_discard = nodiscard, |
| 223 | .d_flag = D_OTHER |
| 224 | }; |
| 225 | |
| 226 | /* |
| 227 | * pci_devioctl: |
| 228 | * |
| 229 | * PCI ioctls that can be performed on devices directly. |
| 230 | */ |
| 231 | int |
| 232 | pci_devioctl(pci_chipset_tag_t pc, pcitag_t tag, u_long cmd, void *data, |
| 233 | int flag, struct lwp *l) |
| 234 | { |
| 235 | struct pciio_cfgreg *r = (void *) data; |
| 236 | |
| 237 | switch (cmd) { |
| 238 | case PCI_IOC_CFGREAD: |
| 239 | r->val = pci_conf_read(pc, tag, r->reg); |
| 240 | break; |
| 241 | |
| 242 | case PCI_IOC_CFGWRITE: |
| 243 | if ((flag & FWRITE) == 0) |
| 244 | return EBADF; |
| 245 | pci_conf_write(pc, tag, r->reg, r->val); |
| 246 | break; |
| 247 | |
| 248 | default: |
| 249 | return EPASSTHROUGH; |
| 250 | } |
| 251 | |
| 252 | return 0; |
| 253 | } |
| 254 | |