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
pciopen(dev_t dev,int flags,int mode,struct lwp * l)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
pciioctl(dev_t dev,u_long cmd,void * data,int flag,struct lwp * l)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
pcimmap(dev_t dev,off_t offset,int prot)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
pci_devioctl(pci_chipset_tag_t pc,pcitag_t tag,u_long cmd,void * data,int flag,struct lwp * l)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