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 | |