pciconf.c revision 41103 
1/*
2 * Copyright 1996 Massachusetts Institute of Technology
3 *
4 * Permission to use, copy, modify, and distribute this software and
5 * its documentation for any purpose and without fee is hereby
6 * granted, provided that both the above copyright notice and this
7 * permission notice appear in all copies, that both the above
8 * copyright notice and this permission notice appear in all
9 * supporting documentation, and that the name of M.I.T. not be used
10 * in advertising or publicity pertaining to distribution of the
11 * software without specific, written prior permission.  M.I.T. makes
12 * no representations about the suitability of this software for any
13 * purpose.  It is provided "as is" without express or implied
14 * warranty.
15 *
16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifndef lint
31static const char rcsid[] =
32	"$Id: pciconf.c,v 1.6 1998/09/15 08:21:13 gibbs Exp $";
33#endif /* not lint */
34
35#include <sys/types.h>
36#include <sys/fcntl.h>
37
38#include <err.h>
39#include <stdlib.h>
40#include <stdio.h>
41#include <string.h>
42#include <unistd.h>
43
44#include <pci/pcivar.h>
45#include <pci/pci_ioctl.h>
46
47#include "pathnames.h"
48
49static void list_devs(void);
50static void readit(const char *, const char *, int);
51static void writeit(const char *, const char *, const char *, int);
52static void chkattached(const char *, int);
53
54static exitstatus = 0;
55
56static void
57usage()
58{
59	fprintf(stderr, "%s\n%s\n%s\n%s\n",
60		"usage: pciconf -l",
61		"       pciconf -a sel",
62		"       pciconf -r [-b | -h] sel addr",
63		"       pciconf -w [-b | -h] sel addr [value]");
64	exit (1);
65}
66
67int
68main(int argc, char **argv)
69{
70	int c;
71	int listmode, readmode, writemode, attachedmode;
72	int byte, isshort;
73
74	listmode = readmode = writemode = attachedmode = byte = isshort = 0;
75
76	while ((c = getopt(argc, argv, "alrwbh")) != -1) {
77		switch(c) {
78		case 'a':
79			attachedmode = 1;
80			break;
81
82		case 'l':
83			listmode = 1;
84			break;
85
86		case 'r':
87			readmode = 1;
88			break;
89
90		case 'w':
91			writemode = 1;
92			break;
93
94		case 'b':
95			byte = 1;
96			break;
97
98		case 'h':
99			isshort = 1;
100			break;
101
102		default:
103			usage();
104		}
105	}
106
107	if ((listmode && optind != argc)
108	    || (writemode && optind + 3 != argc)
109	    || (readmode && optind + 2 != argc)
110	    || (attachedmode && optind + 1 != argc))
111		usage();
112
113	if (listmode) {
114		list_devs();
115	} else if(attachedmode) {
116		chkattached(argv[optind],
117		       byte ? 1 : isshort ? 2 : 4);
118	} else if(readmode) {
119		readit(argv[optind], argv[optind + 1],
120		       byte ? 1 : isshort ? 2 : 4);
121	} else if(writemode) {
122		writeit(argv[optind], argv[optind + 1], argv[optind + 2],
123		       byte ? 1 : isshort ? 2 : 4);
124	} else {
125 		usage();
126	}
127
128	return exitstatus;
129}
130
131static void
132list_devs(void)
133{
134	int fd;
135	struct pci_conf_io pc;
136	struct pci_conf conf[255], *p;
137	int none_count = 0;
138
139	fd = open(_PATH_DEVPCI, O_RDWR, 0);
140	if (fd < 0)
141		err(1, "%s", _PATH_DEVPCI);
142
143	bzero(&pc, sizeof(struct pci_conf_io));
144	pc.match_buf_len = sizeof(conf);
145	pc.matches = conf;
146
147	do {
148		if (ioctl(fd, PCIOCGETCONF, &pc) == -1)
149			err(1, "ioctl(PCIOCGETCONF)");
150
151		/*
152		 * 255 entries should be more than enough for most people,
153		 * but if someone has more devices, and then changes things
154		 * around between ioctls, we'll do the cheezy thing and
155		 * just bail.  The alternative would be to go back to the
156		 * beginning of the list, and print things twice, which may
157		 * not be desireable.
158		 */
159		if (pc.status == PCI_GETCONF_LIST_CHANGED) {
160			warnx("PCI device list changed, please try again");
161			exitstatus = 1;
162			close(fd);
163			return;
164		} else if (pc.status ==  PCI_GETCONF_ERROR) {
165			warnx("Error returned from PCIOCGETCONF ioctl");
166			exitstatus = 1;
167			close(fd);
168			return;
169		}
170		for (p = conf; p < &conf[pc.num_matches]; p++) {
171
172			printf("%s%d@pci%d:%d:%d:\tclass=0x%06x card=0x%08lx "
173			       "chip=0x%08lx rev=0x%02x hdr=0x%02x\n",
174			       (p->pd_name && *p->pd_name) ? p->pd_name :
175			       "none",
176			       (p->pd_name && *p->pd_name) ? p->pd_unit :
177			       none_count++,
178			       p->pc_sel.pc_bus, p->pc_sel.pc_dev,
179			       p->pc_sel.pc_func, (p->pc_class << 16) |
180			       (p->pc_subclass << 8) | p->pc_progif,
181			       (p->pc_subdevice << 16) | p->pc_subvendor,
182			       (p->pc_device << 16) | p->pc_vendor,
183			       p->pc_revid, p->pc_hdr);
184		}
185	} while (pc.status == PCI_GETCONF_MORE_DEVS);
186
187	close(fd);
188}
189
190static struct pcisel
191getsel(const char *str)
192{
193	char *ep = (char*) str;
194	struct pcisel sel;
195
196	if (strncmp(ep, "pci", 3) == 0) {
197		ep += 3;
198		sel.pc_bus = strtoul(ep, &ep, 0);
199		if (!ep || *ep++ != ':')
200			errx(1, "cannot parse selector %s", str);
201		sel.pc_dev = strtoul(ep, &ep, 0);
202		if (!ep || *ep != ':') {
203			sel.pc_func = 0;
204		} else {
205			ep++;
206			sel.pc_func = strtoul(ep, &ep, 0);
207		}
208	}
209	if (*ep == ':')
210		ep++;
211	if (*ep || ep == str)
212		errx(1, "cannot parse selector %s", str);
213	return sel;
214}
215
216static void
217readit(const char *name, const char *reg, int width)
218{
219	int fd;
220	struct pci_io pi;
221
222	pi.pi_sel = getsel(name);
223	pi.pi_reg = strtoul(reg, (char **)0, 0); /* XXX error check */
224	pi.pi_width = width;
225
226	fd = open(_PATH_DEVPCI, O_RDWR, 0);
227	if (fd < 0)
228		err(1, "%s", _PATH_DEVPCI);
229
230	if (ioctl(fd, PCIOCREAD, &pi) < 0)
231		err(1, "ioctl(PCIOCREAD)");
232
233	printf("0x%08x\n", pi.pi_data);
234}
235
236static void
237writeit(const char *name, const char *reg, const char *data, int width)
238{
239	int fd;
240	struct pci_io pi;
241
242	pi.pi_sel = getsel(name);
243	pi.pi_reg = strtoul(reg, (char **)0, 0); /* XXX error check */
244	pi.pi_width = width;
245	pi.pi_data = strtoul(data, (char **)0, 0); /* XXX error check */
246
247	fd = open(_PATH_DEVPCI, O_RDWR, 0);
248	if (fd < 0)
249		err(1, "%s", _PATH_DEVPCI);
250
251	if (ioctl(fd, PCIOCWRITE, &pi) < 0)
252		err(1, "ioctl(PCIOCWRITE)");
253}
254
255static void
256chkattached (const char *name, int width)
257{
258	int fd;
259	struct pci_io pi;
260
261	pi.pi_sel = getsel(name);
262	pi.pi_reg = 0;
263	pi.pi_width = width;
264	pi.pi_data = 0;
265
266	fd = open(_PATH_DEVPCI, O_RDWR, 0);
267	if (fd < 0)
268		err(1, "%s", _PATH_DEVPCI);
269
270	if (ioctl(fd, PCIOCATTACHED, &pi) < 0)
271		err(1, "ioctl(PCIOCATTACHED)");
272
273	exitstatus = pi.pi_data ? 0 : 2; /* exit(2), if NOT attached */
274	printf("%s: %s%s\n", name, pi.pi_data == 0 ? "not " : "", "attached");
275}
276