Commit | Line | Data |
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ddd83eff BH |
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> | |
cdef24c9 | 19 | #include <sys/ioctl.h> |
ddd83eff BH |
20 | #include <sys/mman.h> |
21 | #include <sys/stat.h> | |
22 | #include <unistd.h> | |
012b7105 | 23 | #include <linux/pci.h> |
ddd83eff BH |
24 | |
25 | int sum; | |
26 | ||
b7ed698c | 27 | static int map_mem(char *path, off_t offset, size_t length, int touch) |
ddd83eff BH |
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 | ||
012b7105 AC |
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 | ||
ddd83eff BH |
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; | |
012b7105 | 51 | while (c < (int *) (addr + length)) |
ddd83eff BH |
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 | ||
b7ed698c | 65 | static int scan_tree(char *path, char *file, off_t offset, size_t length, int touch) |
ddd83eff BH |
66 | { |
67 | struct dirent **namelist; | |
68 | char *name, *path2; | |
cdef24c9 | 69 | int i, n, r, rc = 0, result = 0; |
ddd83eff BH |
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)) { | |
012b7105 | 104 | rc = scan_tree(path2, file, offset, length, touch); |
ddd83eff BH |
105 | if (rc < 0) |
106 | return rc; | |
107 | } | |
108 | } | |
109 | ||
110 | result |= rc; | |
111 | free(path2); | |
112 | ||
113 | skip: | |
114 | free(namelist[i]); | |
115 | } | |
116 | free(namelist); | |
cdef24c9 | 117 | return result; |
ddd83eff BH |
118 | } |
119 | ||
120 | char buf[1024]; | |
121 | ||
b7ed698c | 122 | static int read_rom(char *path) |
ddd83eff BH |
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) { | |
5ffd27fa | 135 | close(fd); |
ddd83eff BH |
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 | ||
b7ed698c | 150 | static int scan_rom(char *path, char *file) |
ddd83eff BH |
151 | { |
152 | struct dirent **namelist; | |
153 | char *name, *path2; | |
cdef24c9 | 154 | int i, n, r, rc = 0, result = 0; |
ddd83eff BH |
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 | |
25985edc | 181 | * is no ROM, or some other error occurred. The |
ddd83eff BH |
182 | * important thing is that no MCA happened. |
183 | */ | |
184 | if (rc > 0) | |
cdef24c9 | 185 | fprintf(stderr, "PASS: %s read %d bytes\n", path2, rc); |
ddd83eff BH |
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 | ||
202 | skip: | |
203 | free(namelist[i]); | |
204 | } | |
205 | free(namelist); | |
cdef24c9 | 206 | return result; |
ddd83eff BH |
207 | } |
208 | ||
cdef24c9 | 209 | int main(void) |
ddd83eff BH |
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 | ||
012b7105 AC |
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); | |
ddd83eff BH |
254 | |
255 | scan_rom("/sys/devices", "rom"); | |
012b7105 AC |
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); | |
cdef24c9 RD |
261 | |
262 | return rc; | |
ddd83eff | 263 | } |