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1/*
2 * Exercise /dev/mem mmap cases that have been troublesome in the past
3 *
4 * (c) Copyright 2007 Hewlett-Packard Development Company, L.P.
5 * Bjorn Helgaas <bjorn.helgaas@hp.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <stdlib.h>
13#include <stdio.h>
14#include <sys/types.h>
15#include <dirent.h>
16#include <fcntl.h>
17#include <fnmatch.h>
18#include <string.h>
19#include <sys/ioctl.h>
20#include <sys/mman.h>
21#include <sys/stat.h>
22#include <unistd.h>
23#include <linux/pci.h>
24
25int sum;
26
27static int map_mem(char *path, off_t offset, size_t length, int touch)
28{
29 int fd, rc;
30 void *addr;
31 int *c;
32
33 fd = open(path, O_RDWR);
34 if (fd == -1) {
35 perror(path);
36 return -1;
37 }
38
39 if (fnmatch("/proc/bus/pci/*", path, 0) == 0) {
40 rc = ioctl(fd, PCIIOC_MMAP_IS_MEM);
41 if (rc == -1)
42 perror("PCIIOC_MMAP_IS_MEM ioctl");
43 }
44
45 addr = mmap(NULL, length, PROT_READ|PROT_WRITE, MAP_SHARED, fd, offset);
46 if (addr == MAP_FAILED)
47 return 1;
48
49 if (touch) {
50 c = (int *) addr;
51 while (c < (int *) (addr + length))
52 sum += *c++;
53 }
54
55 rc = munmap(addr, length);
56 if (rc == -1) {
57 perror("munmap");
58 return -1;
59 }
60
61 close(fd);
62 return 0;
63}
64
65static int scan_tree(char *path, char *file, off_t offset, size_t length, int touch)
66{
67 struct dirent **namelist;
68 char *name, *path2;
69 int i, n, r, rc = 0, result = 0;
70 struct stat buf;
71
72 n = scandir(path, &namelist, 0, alphasort);
73 if (n < 0) {
74 perror("scandir");
75 return -1;
76 }
77
78 for (i = 0; i < n; i++) {
79 name = namelist[i]->d_name;
80
81 if (fnmatch(".", name, 0) == 0)
82 goto skip;
83 if (fnmatch("..", name, 0) == 0)
84 goto skip;
85
86 path2 = malloc(strlen(path) + strlen(name) + 3);
87 strcpy(path2, path);
88 strcat(path2, "/");
89 strcat(path2, name);
90
91 if (fnmatch(file, name, 0) == 0) {
92 rc = map_mem(path2, offset, length, touch);
93 if (rc == 0)
94 fprintf(stderr, "PASS: %s 0x%lx-0x%lx is %s\n", path2, offset, offset + length, touch ? "readable" : "mappable");
95 else if (rc > 0)
96 fprintf(stderr, "PASS: %s 0x%lx-0x%lx not mappable\n", path2, offset, offset + length);
97 else {
98 fprintf(stderr, "FAIL: %s 0x%lx-0x%lx not accessible\n", path2, offset, offset + length);
99 return rc;
100 }
101 } else {
102 r = lstat(path2, &buf);
103 if (r == 0 && S_ISDIR(buf.st_mode)) {
104 rc = scan_tree(path2, file, offset, length, touch);
105 if (rc < 0)
106 return rc;
107 }
108 }
109
110 result |= rc;
111 free(path2);
112
113skip:
114 free(namelist[i]);
115 }
116 free(namelist);
117 return result;
118}
119
120char buf[1024];
121
122static int read_rom(char *path)
123{
124 int fd, rc;
125 size_t size = 0;
126
127 fd = open(path, O_RDWR);
128 if (fd == -1) {
129 perror(path);
130 return -1;
131 }
132
133 rc = write(fd, "1", 2);
134 if (rc <= 0) {
135 close(fd);
136 perror("write");
137 return -1;
138 }
139
140 do {
141 rc = read(fd, buf, sizeof(buf));
142 if (rc > 0)
143 size += rc;
144 } while (rc > 0);
145
146 close(fd);
147 return size;
148}
149
150static int scan_rom(char *path, char *file)
151{
152 struct dirent **namelist;
153 char *name, *path2;
154 int i, n, r, rc = 0, result = 0;
155 struct stat buf;
156
157 n = scandir(path, &namelist, 0, alphasort);
158 if (n < 0) {
159 perror("scandir");
160 return -1;
161 }
162
163 for (i = 0; i < n; i++) {
164 name = namelist[i]->d_name;
165
166 if (fnmatch(".", name, 0) == 0)
167 goto skip;
168 if (fnmatch("..", name, 0) == 0)
169 goto skip;
170
171 path2 = malloc(strlen(path) + strlen(name) + 3);
172 strcpy(path2, path);
173 strcat(path2, "/");
174 strcat(path2, name);
175
176 if (fnmatch(file, name, 0) == 0) {
177 rc = read_rom(path2);
178
179 /*
180 * It's OK if the ROM is unreadable. Maybe there
181 * is no ROM, or some other error occurred. The
182 * important thing is that no MCA happened.
183 */
184 if (rc > 0)
185 fprintf(stderr, "PASS: %s read %d bytes\n", path2, rc);
186 else {
187 fprintf(stderr, "PASS: %s not readable\n", path2);
188 return rc;
189 }
190 } else {
191 r = lstat(path2, &buf);
192 if (r == 0 && S_ISDIR(buf.st_mode)) {
193 rc = scan_rom(path2, file);
194 if (rc < 0)
195 return rc;
196 }
197 }
198
199 result |= rc;
200 free(path2);
201
202skip:
203 free(namelist[i]);
204 }
205 free(namelist);
206 return result;
207}
208
209int main(void)
210{
211 int rc;
212
213 if (map_mem("/dev/mem", 0, 0xA0000, 1) == 0)
214 fprintf(stderr, "PASS: /dev/mem 0x0-0xa0000 is readable\n");
215 else
216 fprintf(stderr, "FAIL: /dev/mem 0x0-0xa0000 not accessible\n");
217
218 /*
219 * It's not safe to blindly read the VGA frame buffer. If you know
220 * how to poke the card the right way, it should respond, but it's
221 * not safe in general. Many machines, e.g., Intel chipsets, cover
222 * up a non-responding card by just returning -1, but others will
223 * report the failure as a machine check.
224 */
225 if (map_mem("/dev/mem", 0xA0000, 0x20000, 0) == 0)
226 fprintf(stderr, "PASS: /dev/mem 0xa0000-0xc0000 is mappable\n");
227 else
228 fprintf(stderr, "FAIL: /dev/mem 0xa0000-0xc0000 not accessible\n");
229
230 if (map_mem("/dev/mem", 0xC0000, 0x40000, 1) == 0)
231 fprintf(stderr, "PASS: /dev/mem 0xc0000-0x100000 is readable\n");
232 else
233 fprintf(stderr, "FAIL: /dev/mem 0xc0000-0x100000 not accessible\n");
234
235 /*
236 * Often you can map all the individual pieces above (0-0xA0000,
237 * 0xA0000-0xC0000, and 0xC0000-0x100000), but can't map the whole
238 * thing at once. This is because the individual pieces use different
239 * attributes, and there's no single attribute supported over the
240 * whole region.
241 */
242 rc = map_mem("/dev/mem", 0, 1024*1024, 0);
243 if (rc == 0)
244 fprintf(stderr, "PASS: /dev/mem 0x0-0x100000 is mappable\n");
245 else if (rc > 0)
246 fprintf(stderr, "PASS: /dev/mem 0x0-0x100000 not mappable\n");
247 else
248 fprintf(stderr, "FAIL: /dev/mem 0x0-0x100000 not accessible\n");
249
250 scan_tree("/sys/class/pci_bus", "legacy_mem", 0, 0xA0000, 1);
251 scan_tree("/sys/class/pci_bus", "legacy_mem", 0xA0000, 0x20000, 0);
252 scan_tree("/sys/class/pci_bus", "legacy_mem", 0xC0000, 0x40000, 1);
253 scan_tree("/sys/class/pci_bus", "legacy_mem", 0, 1024*1024, 0);
254
255 scan_rom("/sys/devices", "rom");
256
257 scan_tree("/proc/bus/pci", "??.?", 0, 0xA0000, 1);
258 scan_tree("/proc/bus/pci", "??.?", 0xA0000, 0x20000, 0);
259 scan_tree("/proc/bus/pci", "??.?", 0xC0000, 0x40000, 1);
260 scan_tree("/proc/bus/pci", "??.?", 0, 1024*1024, 0);
261
262 return rc;
263}
264

Warning: That file was not part of the compilation database. It may have many parsing errors.