1 /* $NetBSD: pci_usrreq.c,v 1.29 2015/08/24 23:55:04 pooka 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 1.29 2015/08/24 23:55:04 pooka 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 pcitag_t tag; 84 85 switch (cmd) { 86 case PCI_IOC_BDF_CFGREAD: 87 case PCI_IOC_BDF_CFGWRITE: 88 bdfr = data; 89 if (bdfr->bus > 255 || bdfr->device >= sc->sc_maxndevs || 90 bdfr->function > 7 || ISSET(bdfr->cfgreg.reg, 3)) 91 return EINVAL; 92 tag = pci_make_tag(sc->sc_pc, bdfr->bus, bdfr->device, 93 bdfr->function); 94 95 if (cmd == PCI_IOC_BDF_CFGREAD) { 96 bdfr->cfgreg.val = pci_conf_read(sc->sc_pc, tag, 97 bdfr->cfgreg.reg); 98 } else { 99 if ((flag & FWRITE) == 0) 100 return EBADF; 101 pci_conf_write(sc->sc_pc, tag, bdfr->cfgreg.reg, 102 bdfr->cfgreg.val); 103 } 104 return 0; 105 106 case PCI_IOC_BUSINFO: 107 binfo = data; 108 binfo->busno = sc->sc_bus; 109 binfo->maxdevs = sc->sc_maxndevs; 110 return 0; 111 112 case PCI_IOC_DRVNAME: 113 dname = data; 114 if (dname->device >= sc->sc_maxndevs || dname->function > 7) 115 return EINVAL; 116 child = &sc->PCI_SC_DEVICESC(dname->device, dname->function); 117 if (!child->c_dev) 118 return ENXIO; 119 strlcpy(dname->name, device_xname(child->c_dev), 120 sizeof dname->name); 121 return 0; 122 123 default: 124 return ENOTTY; 125 } 126 } 127 128 static paddr_t 129 pcimmap(dev_t dev, off_t offset, int prot) 130 { 131 struct pci_softc *sc = device_lookup_private(&pci_cd, minor(dev)); 132 struct pci_child *c; 133 struct pci_range *r; 134 int flags = 0; 135 int device, range; 136 137 if (kauth_authorize_machdep(kauth_cred_get(), KAUTH_MACHDEP_UNMANAGEDMEM, 138 NULL, NULL, NULL, NULL) != 0) { 139 return -1; 140 } 141 /* 142 * Since we allow mapping of the entire bus, we 143 * take the offset to be the address on the bus, 144 * and pass 0 as the offset into that range. 145 * 146 * XXX Need a way to deal with linear/etc. 147 * 148 * XXX we rely on MD mmap() methods to enforce limits since these 149 * are hidden in *_tag_t structs if they exist at all 150 */ 151 152 #ifdef PCI_MAGIC_IO_RANGE 153 /* 154 * first, check if someone's trying to map the IO range 155 * XXX this assumes 64kB IO space even though some machines can have 156 * significantly more than that - macppc's bandit host bridge allows 157 * 8MB IO space and sparc64 may have the entire 4GB available. The 158 * firmware on both tries to use the lower 64kB first though and 159 * exausting it is pretty difficult so we should be safe 160 */ 161 if ((offset >= PCI_MAGIC_IO_RANGE) && 162 (offset < (PCI_MAGIC_IO_RANGE + 0x10000))) { 163 return bus_space_mmap(sc->sc_iot, offset - PCI_MAGIC_IO_RANGE, 164 0, prot, 0); 165 } 166 #endif /* PCI_MAGIC_IO_RANGE */ 167 168 for (device = 0; device < __arraycount(sc->sc_devices); device++) { 169 c = &sc->sc_devices[device]; 170 if (c->c_dev == NULL) 171 continue; 172 for (range = 0; range < __arraycount(c->c_range); range++) { 173 r = &c->c_range[range]; 174 if (r->r_size == 0) 175 break; 176 if (offset >= r->r_offset && 177 offset < r->r_offset + r->r_size) { 178 flags = r->r_flags; 179 break; 180 } 181 } 182 } 183 184 return bus_space_mmap(sc->sc_memt, offset, 0, prot, flags); 185 } 186 187 const struct cdevsw pci_cdevsw = { 188 .d_open = pciopen, 189 .d_close = nullclose, 190 .d_read = noread, 191 .d_write = nowrite, 192 .d_ioctl = pciioctl, 193 .d_stop = nostop, 194 .d_tty = notty, 195 .d_poll = nopoll, 196 .d_mmap = pcimmap, 197 .d_kqfilter = nokqfilter, 198 .d_discard = nodiscard, 199 .d_flag = D_OTHER 200 }; 201 202 /* 203 * pci_devioctl: 204 * 205 * PCI ioctls that can be performed on devices directly. 206 */ 207 int 208 pci_devioctl(pci_chipset_tag_t pc, pcitag_t tag, u_long cmd, void *data, 209 int flag, struct lwp *l) 210 { 211 struct pciio_cfgreg *r = (void *) data; 212 213 switch (cmd) { 214 case PCI_IOC_CFGREAD: 215 r->val = pci_conf_read(pc, tag, r->reg); 216 break; 217 218 case PCI_IOC_CFGWRITE: 219 if ((flag & FWRITE) == 0) 220 return EBADF; 221 pci_conf_write(pc, tag, r->reg, r->val); 222 break; 223 224 default: 225 return EPASSTHROUGH; 226 } 227 228 return 0; 229 } 230