1/* $NetBSD: pci_usrreq.c,v 1.23 2011/02/10 12:37:58 jmcneill 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 1.23 2011/02/10 12:37:58 jmcneill 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 61static int 62pciopen(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 73static int 74pciioctl(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 || ISSET(bdfr->cfgreg.reg, 3)) 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 113static paddr_t 114pcimmap(dev_t dev, off_t offset, int prot) 115{ 116 struct pci_softc *sc = device_lookup_private(&pci_cd, minor(dev)); 117 struct pci_child *c; 118 struct pci_range *r; 119 int flags = 0; 120 int device, range; 121 122 if (kauth_authorize_generic(kauth_cred_get(), KAUTH_GENERIC_ISSUSER, 123 NULL) != 0) { 124 return -1; 125 } 126 /* 127 * Since we allow mapping of the entire bus, we 128 * take the offset to be the address on the bus, 129 * and pass 0 as the offset into that range. 130 * 131 * XXX Need a way to deal with linear/etc. 132 * 133 * XXX we rely on MD mmap() methods to enforce limits since these 134 * are hidden in *_tag_t structs if they exist at all 135 */ 136 137#ifdef PCI_MAGIC_IO_RANGE 138 /* 139 * first, check if someone's trying to map the IO range 140 * XXX this assumes 64kB IO space even though some machines can have 141 * significantly more than that - macppc's bandit host bridge allows 142 * 8MB IO space and sparc64 may have the entire 4GB available. The 143 * firmware on both tries to use the lower 64kB first though and 144 * exausting it is pretty difficult so we should be safe 145 */ 146 if ((offset >= PCI_MAGIC_IO_RANGE) && 147 (offset < (PCI_MAGIC_IO_RANGE + 0x10000))) { 148 return bus_space_mmap(sc->sc_iot, offset - PCI_MAGIC_IO_RANGE, 149 0, prot, 0); 150 } 151#endif /* PCI_MAGIC_IO_RANGE */ 152 153 for (device = 0; device < __arraycount(sc->sc_devices); device++) { 154 c = &sc->sc_devices[device]; 155 if (c->c_dev == NULL) 156 continue; 157 for (range = 0; range < __arraycount(c->c_range); range++) { 158 r = &c->c_range[range]; 159 if (r->r_size == 0) 160 break; 161 if (offset >= r->r_offset && 162 offset < r->r_offset + r->r_size) { 163 flags = r->r_flags; 164 break; 165 } 166 } 167 } 168 169 return bus_space_mmap(sc->sc_memt, offset, 0, prot, flags); 170} 171 172const struct cdevsw pci_cdevsw = { 173 pciopen, nullclose, noread, nowrite, pciioctl, 174 nostop, notty, nopoll, pcimmap, nokqfilter, D_OTHER, 175}; 176 177/* 178 * pci_devioctl: 179 * 180 * PCI ioctls that can be performed on devices directly. 181 */ 182int 183pci_devioctl(pci_chipset_tag_t pc, pcitag_t tag, u_long cmd, void *data, 184 int flag, struct lwp *l) 185{ 186 struct pciio_cfgreg *r = (void *) data; 187 188 switch (cmd) { 189 case PCI_IOC_CFGREAD: 190 r->val = pci_conf_read(pc, tag, r->reg); 191 break; 192 193 case PCI_IOC_CFGWRITE: 194 if ((flag & FWRITE) == 0) 195 return EBADF; 196 pci_conf_write(pc, tag, r->reg, r->val); 197 break; 198 199 default: 200 return EPASSTHROUGH; 201 } 202 203 return 0; 204} 205