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1#include <linux/capability.h>
2#include <linux/seq_file.h>
3#include <linux/uaccess.h>
4#include <linux/proc_fs.h>
5#include <linux/module.h>
6#include <linux/ctype.h>
7#include <linux/string.h>
8#include <linux/slab.h>
9#include <linux/init.h>
10
11#define LINE_SIZE 80
12
13#include <asm/mtrr.h>
14
15#include "mtrr.h"
16
17#define FILE_FCOUNT(f) (((struct seq_file *)((f)->private_data))->private)
18
19static const char *const mtrr_strings[MTRR_NUM_TYPES] =
20{
21 "uncachable", /* 0 */
22 "write-combining", /* 1 */
23 "?", /* 2 */
24 "?", /* 3 */
25 "write-through", /* 4 */
26 "write-protect", /* 5 */
27 "write-back", /* 6 */
28};
29
30const char *mtrr_attrib_to_str(int x)
31{
32 return (x <= 6) ? mtrr_strings[x] : "?";
33}
34
35#ifdef CONFIG_PROC_FS
36
37static int
38mtrr_file_add(unsigned long base, unsigned long size,
39 unsigned int type, bool increment, struct file *file, int page)
40{
41 unsigned int *fcount = FILE_FCOUNT(file);
42 int reg, max;
43
44 max = num_var_ranges;
45 if (fcount == NULL) {
46 fcount = kzalloc(max * sizeof *fcount, GFP_KERNEL);
47 if (!fcount)
48 return -ENOMEM;
49 FILE_FCOUNT(file) = fcount;
50 }
51 if (!page) {
52 if ((base & (PAGE_SIZE - 1)) || (size & (PAGE_SIZE - 1)))
53 return -EINVAL;
54 base >>= PAGE_SHIFT;
55 size >>= PAGE_SHIFT;
56 }
57 reg = mtrr_add_page(base, size, type, true);
58 if (reg >= 0)
59 ++fcount[reg];
60 return reg;
61}
62
63static int
64mtrr_file_del(unsigned long base, unsigned long size,
65 struct file *file, int page)
66{
67 unsigned int *fcount = FILE_FCOUNT(file);
68 int reg;
69
70 if (!page) {
71 if ((base & (PAGE_SIZE - 1)) || (size & (PAGE_SIZE - 1)))
72 return -EINVAL;
73 base >>= PAGE_SHIFT;
74 size >>= PAGE_SHIFT;
75 }
76 reg = mtrr_del_page(-1, base, size);
77 if (reg < 0)
78 return reg;
79 if (fcount == NULL)
80 return reg;
81 if (fcount[reg] < 1)
82 return -EINVAL;
83 --fcount[reg];
84 return reg;
85}
86
87/*
88 * seq_file can seek but we ignore it.
89 *
90 * Format of control line:
91 * "base=%Lx size=%Lx type=%s" or "disable=%d"
92 */
93static ssize_t
94mtrr_write(struct file *file, const char __user *buf, size_t len, loff_t * ppos)
95{
96 int i, err;
97 unsigned long reg;
98 unsigned long long base, size;
99 char *ptr;
100 char line[LINE_SIZE];
101 int length;
102 size_t linelen;
103
104 if (!capable(CAP_SYS_ADMIN))
105 return -EPERM;
106
107 memset(line, 0, LINE_SIZE);
108
109 length = len;
110 length--;
111
112 if (length > LINE_SIZE - 1)
113 length = LINE_SIZE - 1;
114
115 if (length < 0)
116 return -EINVAL;
117
118 if (copy_from_user(line, buf, length))
119 return -EFAULT;
120
121 linelen = strlen(line);
122 ptr = line + linelen - 1;
123 if (linelen && *ptr == '\n')
124 *ptr = '\0';
125
126 if (!strncmp(line, "disable=", 8)) {
127 reg = simple_strtoul(line + 8, &ptr, 0);
128 err = mtrr_del_page(reg, 0, 0);
129 if (err < 0)
130 return err;
131 return len;
132 }
133
134 if (strncmp(line, "base=", 5))
135 return -EINVAL;
136
137 base = simple_strtoull(line + 5, &ptr, 0);
138 ptr = skip_spaces(ptr);
139
140 if (strncmp(ptr, "size=", 5))
141 return -EINVAL;
142
143 size = simple_strtoull(ptr + 5, &ptr, 0);
144 if ((base & 0xfff) || (size & 0xfff))
145 return -EINVAL;
146 ptr = skip_spaces(ptr);
147
148 if (strncmp(ptr, "type=", 5))
149 return -EINVAL;
150 ptr = skip_spaces(ptr + 5);
151
152 for (i = 0; i < MTRR_NUM_TYPES; ++i) {
153 if (strcmp(ptr, mtrr_strings[i]))
154 continue;
155 base >>= PAGE_SHIFT;
156 size >>= PAGE_SHIFT;
157 err = mtrr_add_page((unsigned long)base, (unsigned long)size, i, true);
158 if (err < 0)
159 return err;
160 return len;
161 }
162 return -EINVAL;
163}
164
165static long
166mtrr_ioctl(struct file *file, unsigned int cmd, unsigned long __arg)
167{
168 int err = 0;
169 mtrr_type type;
170 unsigned long base;
171 unsigned long size;
172 struct mtrr_sentry sentry;
173 struct mtrr_gentry gentry;
174 void __user *arg = (void __user *) __arg;
175
176 switch (cmd) {
177 case MTRRIOC_ADD_ENTRY:
178 case MTRRIOC_SET_ENTRY:
179 case MTRRIOC_DEL_ENTRY:
180 case MTRRIOC_KILL_ENTRY:
181 case MTRRIOC_ADD_PAGE_ENTRY:
182 case MTRRIOC_SET_PAGE_ENTRY:
183 case MTRRIOC_DEL_PAGE_ENTRY:
184 case MTRRIOC_KILL_PAGE_ENTRY:
185 if (copy_from_user(&sentry, arg, sizeof sentry))
186 return -EFAULT;
187 break;
188 case MTRRIOC_GET_ENTRY:
189 case MTRRIOC_GET_PAGE_ENTRY:
190 if (copy_from_user(&gentry, arg, sizeof gentry))
191 return -EFAULT;
192 break;
193#ifdef CONFIG_COMPAT
194 case MTRRIOC32_ADD_ENTRY:
195 case MTRRIOC32_SET_ENTRY:
196 case MTRRIOC32_DEL_ENTRY:
197 case MTRRIOC32_KILL_ENTRY:
198 case MTRRIOC32_ADD_PAGE_ENTRY:
199 case MTRRIOC32_SET_PAGE_ENTRY:
200 case MTRRIOC32_DEL_PAGE_ENTRY:
201 case MTRRIOC32_KILL_PAGE_ENTRY: {
202 struct mtrr_sentry32 __user *s32;
203
204 s32 = (struct mtrr_sentry32 __user *)__arg;
205 err = get_user(sentry.base, &s32->base);
206 err |= get_user(sentry.size, &s32->size);
207 err |= get_user(sentry.type, &s32->type);
208 if (err)
209 return err;
210 break;
211 }
212 case MTRRIOC32_GET_ENTRY:
213 case MTRRIOC32_GET_PAGE_ENTRY: {
214 struct mtrr_gentry32 __user *g32;
215
216 g32 = (struct mtrr_gentry32 __user *)__arg;
217 err = get_user(gentry.regnum, &g32->regnum);
218 err |= get_user(gentry.base, &g32->base);
219 err |= get_user(gentry.size, &g32->size);
220 err |= get_user(gentry.type, &g32->type);
221 if (err)
222 return err;
223 break;
224 }
225#endif
226 }
227
228 switch (cmd) {
229 default:
230 return -ENOTTY;
231 case MTRRIOC_ADD_ENTRY:
232#ifdef CONFIG_COMPAT
233 case MTRRIOC32_ADD_ENTRY:
234#endif
235 if (!capable(CAP_SYS_ADMIN))
236 return -EPERM;
237 err =
238 mtrr_file_add(sentry.base, sentry.size, sentry.type, true,
239 file, 0);
240 break;
241 case MTRRIOC_SET_ENTRY:
242#ifdef CONFIG_COMPAT
243 case MTRRIOC32_SET_ENTRY:
244#endif
245 if (!capable(CAP_SYS_ADMIN))
246 return -EPERM;
247 err = mtrr_add(sentry.base, sentry.size, sentry.type, false);
248 break;
249 case MTRRIOC_DEL_ENTRY:
250#ifdef CONFIG_COMPAT
251 case MTRRIOC32_DEL_ENTRY:
252#endif
253 if (!capable(CAP_SYS_ADMIN))
254 return -EPERM;
255 err = mtrr_file_del(sentry.base, sentry.size, file, 0);
256 break;
257 case MTRRIOC_KILL_ENTRY:
258#ifdef CONFIG_COMPAT
259 case MTRRIOC32_KILL_ENTRY:
260#endif
261 if (!capable(CAP_SYS_ADMIN))
262 return -EPERM;
263 err = mtrr_del(-1, sentry.base, sentry.size);
264 break;
265 case MTRRIOC_GET_ENTRY:
266#ifdef CONFIG_COMPAT
267 case MTRRIOC32_GET_ENTRY:
268#endif
269 if (gentry.regnum >= num_var_ranges)
270 return -EINVAL;
271 mtrr_if->get(gentry.regnum, &base, &size, &type);
272
273 /* Hide entries that go above 4GB */
274 if (base + size - 1 >= (1UL << (8 * sizeof(gentry.size) - PAGE_SHIFT))
275 || size >= (1UL << (8 * sizeof(gentry.size) - PAGE_SHIFT)))
276 gentry.base = gentry.size = gentry.type = 0;
277 else {
278 gentry.base = base << PAGE_SHIFT;
279 gentry.size = size << PAGE_SHIFT;
280 gentry.type = type;
281 }
282
283 break;
284 case MTRRIOC_ADD_PAGE_ENTRY:
285#ifdef CONFIG_COMPAT
286 case MTRRIOC32_ADD_PAGE_ENTRY:
287#endif
288 if (!capable(CAP_SYS_ADMIN))
289 return -EPERM;
290 err =
291 mtrr_file_add(sentry.base, sentry.size, sentry.type, true,
292 file, 1);
293 break;
294 case MTRRIOC_SET_PAGE_ENTRY:
295#ifdef CONFIG_COMPAT
296 case MTRRIOC32_SET_PAGE_ENTRY:
297#endif
298 if (!capable(CAP_SYS_ADMIN))
299 return -EPERM;
300 err =
301 mtrr_add_page(sentry.base, sentry.size, sentry.type, false);
302 break;
303 case MTRRIOC_DEL_PAGE_ENTRY:
304#ifdef CONFIG_COMPAT
305 case MTRRIOC32_DEL_PAGE_ENTRY:
306#endif
307 if (!capable(CAP_SYS_ADMIN))
308 return -EPERM;
309 err = mtrr_file_del(sentry.base, sentry.size, file, 1);
310 break;
311 case MTRRIOC_KILL_PAGE_ENTRY:
312#ifdef CONFIG_COMPAT
313 case MTRRIOC32_KILL_PAGE_ENTRY:
314#endif
315 if (!capable(CAP_SYS_ADMIN))
316 return -EPERM;
317 err = mtrr_del_page(-1, sentry.base, sentry.size);
318 break;
319 case MTRRIOC_GET_PAGE_ENTRY:
320#ifdef CONFIG_COMPAT
321 case MTRRIOC32_GET_PAGE_ENTRY:
322#endif
323 if (gentry.regnum >= num_var_ranges)
324 return -EINVAL;
325 mtrr_if->get(gentry.regnum, &base, &size, &type);
326 /* Hide entries that would overflow */
327 if (size != (__typeof__(gentry.size))size)
328 gentry.base = gentry.size = gentry.type = 0;
329 else {
330 gentry.base = base;
331 gentry.size = size;
332 gentry.type = type;
333 }
334 break;
335 }
336
337 if (err)
338 return err;
339
340 switch (cmd) {
341 case MTRRIOC_GET_ENTRY:
342 case MTRRIOC_GET_PAGE_ENTRY:
343 if (copy_to_user(arg, &gentry, sizeof gentry))
344 err = -EFAULT;
345 break;
346#ifdef CONFIG_COMPAT
347 case MTRRIOC32_GET_ENTRY:
348 case MTRRIOC32_GET_PAGE_ENTRY: {
349 struct mtrr_gentry32 __user *g32;
350
351 g32 = (struct mtrr_gentry32 __user *)__arg;
352 err = put_user(gentry.base, &g32->base);
353 err |= put_user(gentry.size, &g32->size);
354 err |= put_user(gentry.regnum, &g32->regnum);
355 err |= put_user(gentry.type, &g32->type);
356 break;
357 }
358#endif
359 }
360 return err;
361}
362
363static int mtrr_close(struct inode *ino, struct file *file)
364{
365 unsigned int *fcount = FILE_FCOUNT(file);
366 int i, max;
367
368 if (fcount != NULL) {
369 max = num_var_ranges;
370 for (i = 0; i < max; ++i) {
371 while (fcount[i] > 0) {
372 mtrr_del(i, 0, 0);
373 --fcount[i];
374 }
375 }
376 kfree(fcount);
377 FILE_FCOUNT(file) = NULL;
378 }
379 return single_release(ino, file);
380}
381
382static int mtrr_seq_show(struct seq_file *seq, void *offset);
383
384static int mtrr_open(struct inode *inode, struct file *file)
385{
386 if (!mtrr_if)
387 return -EIO;
388 if (!mtrr_if->get)
389 return -ENXIO;
390 return single_open(file, mtrr_seq_show, NULL);
391}
392
393static const struct file_operations mtrr_fops = {
394 .owner = THIS_MODULE,
395 .open = mtrr_open,
396 .read = seq_read,
397 .llseek = seq_lseek,
398 .write = mtrr_write,
399 .unlocked_ioctl = mtrr_ioctl,
400 .compat_ioctl = mtrr_ioctl,
401 .release = mtrr_close,
402};
403
404static int mtrr_seq_show(struct seq_file *seq, void *offset)
405{
406 char factor;
407 int i, max, len;
408 mtrr_type type;
409 unsigned long base, size;
410
411 len = 0;
412 max = num_var_ranges;
413 for (i = 0; i < max; i++) {
414 mtrr_if->get(i, &base, &size, &type);
415 if (size == 0) {
416 mtrr_usage_table[i] = 0;
417 continue;
418 }
419 if (size < (0x100000 >> PAGE_SHIFT)) {
420 /* less than 1MB */
421 factor = 'K';
422 size <<= PAGE_SHIFT - 10;
423 } else {
424 factor = 'M';
425 size >>= 20 - PAGE_SHIFT;
426 }
427 /* Base can be > 32bit */
428 len += seq_printf(seq, "reg%02i: base=0x%06lx000 "
429 "(%5luMB), size=%5lu%cB, count=%d: %s\n",
430 i, base, base >> (20 - PAGE_SHIFT), size,
431 factor, mtrr_usage_table[i],
432 mtrr_attrib_to_str(type));
433 }
434 return 0;
435}
436
437static int __init mtrr_if_init(void)
438{
439 struct cpuinfo_x86 *c = &boot_cpu_data;
440
441 if ((!cpu_has(c, X86_FEATURE_MTRR)) &&
442 (!cpu_has(c, X86_FEATURE_K6_MTRR)) &&
443 (!cpu_has(c, X86_FEATURE_CYRIX_ARR)) &&
444 (!cpu_has(c, X86_FEATURE_CENTAUR_MCR)))
445 return -ENODEV;
446
447 proc_create("mtrr", S_IWUSR | S_IRUGO, NULL, &mtrr_fops);
448 return 0;
449}
450arch_initcall(mtrr_if_init);
451#endif /* CONFIG_PROC_FS */
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/capability.h>
3#include <linux/seq_file.h>
4#include <linux/uaccess.h>
5#include <linux/proc_fs.h>
6#include <linux/ctype.h>
7#include <linux/string.h>
8#include <linux/slab.h>
9#include <linux/init.h>
10
11#define LINE_SIZE 80
12
13#include <asm/mtrr.h>
14
15#include "mtrr.h"
16
17#define FILE_FCOUNT(f) (((struct seq_file *)((f)->private_data))->private)
18
19static const char *const mtrr_strings[MTRR_NUM_TYPES] =
20{
21 "uncachable", /* 0 */
22 "write-combining", /* 1 */
23 "?", /* 2 */
24 "?", /* 3 */
25 "write-through", /* 4 */
26 "write-protect", /* 5 */
27 "write-back", /* 6 */
28};
29
30const char *mtrr_attrib_to_str(int x)
31{
32 return (x <= 6) ? mtrr_strings[x] : "?";
33}
34
35#ifdef CONFIG_PROC_FS
36
37static int
38mtrr_file_add(unsigned long base, unsigned long size,
39 unsigned int type, bool increment, struct file *file, int page)
40{
41 unsigned int *fcount = FILE_FCOUNT(file);
42 int reg, max;
43
44 max = num_var_ranges;
45 if (fcount == NULL) {
46 fcount = kcalloc(max, sizeof(*fcount), GFP_KERNEL);
47 if (!fcount)
48 return -ENOMEM;
49 FILE_FCOUNT(file) = fcount;
50 }
51 if (!page) {
52 if ((base & (PAGE_SIZE - 1)) || (size & (PAGE_SIZE - 1)))
53 return -EINVAL;
54 base >>= PAGE_SHIFT;
55 size >>= PAGE_SHIFT;
56 }
57 reg = mtrr_add_page(base, size, type, true);
58 if (reg >= 0)
59 ++fcount[reg];
60 return reg;
61}
62
63static int
64mtrr_file_del(unsigned long base, unsigned long size,
65 struct file *file, int page)
66{
67 unsigned int *fcount = FILE_FCOUNT(file);
68 int reg;
69
70 if (!page) {
71 if ((base & (PAGE_SIZE - 1)) || (size & (PAGE_SIZE - 1)))
72 return -EINVAL;
73 base >>= PAGE_SHIFT;
74 size >>= PAGE_SHIFT;
75 }
76 reg = mtrr_del_page(-1, base, size);
77 if (reg < 0)
78 return reg;
79 if (fcount == NULL)
80 return reg;
81 if (fcount[reg] < 1)
82 return -EINVAL;
83 --fcount[reg];
84 return reg;
85}
86
87/*
88 * seq_file can seek but we ignore it.
89 *
90 * Format of control line:
91 * "base=%Lx size=%Lx type=%s" or "disable=%d"
92 */
93static ssize_t
94mtrr_write(struct file *file, const char __user *buf, size_t len, loff_t * ppos)
95{
96 int i, err;
97 unsigned long reg;
98 unsigned long long base, size;
99 char *ptr;
100 char line[LINE_SIZE];
101 int length;
102 size_t linelen;
103
104 memset(line, 0, LINE_SIZE);
105
106 len = min_t(size_t, len, LINE_SIZE - 1);
107 length = strncpy_from_user(line, buf, len);
108 if (length < 0)
109 return length;
110
111 linelen = strlen(line);
112 ptr = line + linelen - 1;
113 if (linelen && *ptr == '\n')
114 *ptr = '\0';
115
116 if (!strncmp(line, "disable=", 8)) {
117 reg = simple_strtoul(line + 8, &ptr, 0);
118 err = mtrr_del_page(reg, 0, 0);
119 if (err < 0)
120 return err;
121 return len;
122 }
123
124 if (strncmp(line, "base=", 5))
125 return -EINVAL;
126
127 base = simple_strtoull(line + 5, &ptr, 0);
128 ptr = skip_spaces(ptr);
129
130 if (strncmp(ptr, "size=", 5))
131 return -EINVAL;
132
133 size = simple_strtoull(ptr + 5, &ptr, 0);
134 if ((base & 0xfff) || (size & 0xfff))
135 return -EINVAL;
136 ptr = skip_spaces(ptr);
137
138 if (strncmp(ptr, "type=", 5))
139 return -EINVAL;
140 ptr = skip_spaces(ptr + 5);
141
142 i = match_string(mtrr_strings, MTRR_NUM_TYPES, ptr);
143 if (i < 0)
144 return i;
145
146 base >>= PAGE_SHIFT;
147 size >>= PAGE_SHIFT;
148 err = mtrr_add_page((unsigned long)base, (unsigned long)size, i, true);
149 if (err < 0)
150 return err;
151 return len;
152}
153
154static long
155mtrr_ioctl(struct file *file, unsigned int cmd, unsigned long __arg)
156{
157 int err = 0;
158 mtrr_type type;
159 unsigned long base;
160 unsigned long size;
161 struct mtrr_sentry sentry;
162 struct mtrr_gentry gentry;
163 void __user *arg = (void __user *) __arg;
164
165 memset(&gentry, 0, sizeof(gentry));
166
167 switch (cmd) {
168 case MTRRIOC_ADD_ENTRY:
169 case MTRRIOC_SET_ENTRY:
170 case MTRRIOC_DEL_ENTRY:
171 case MTRRIOC_KILL_ENTRY:
172 case MTRRIOC_ADD_PAGE_ENTRY:
173 case MTRRIOC_SET_PAGE_ENTRY:
174 case MTRRIOC_DEL_PAGE_ENTRY:
175 case MTRRIOC_KILL_PAGE_ENTRY:
176 if (copy_from_user(&sentry, arg, sizeof(sentry)))
177 return -EFAULT;
178 break;
179 case MTRRIOC_GET_ENTRY:
180 case MTRRIOC_GET_PAGE_ENTRY:
181 if (copy_from_user(&gentry, arg, sizeof(gentry)))
182 return -EFAULT;
183 break;
184#ifdef CONFIG_COMPAT
185 case MTRRIOC32_ADD_ENTRY:
186 case MTRRIOC32_SET_ENTRY:
187 case MTRRIOC32_DEL_ENTRY:
188 case MTRRIOC32_KILL_ENTRY:
189 case MTRRIOC32_ADD_PAGE_ENTRY:
190 case MTRRIOC32_SET_PAGE_ENTRY:
191 case MTRRIOC32_DEL_PAGE_ENTRY:
192 case MTRRIOC32_KILL_PAGE_ENTRY: {
193 struct mtrr_sentry32 __user *s32;
194
195 s32 = (struct mtrr_sentry32 __user *)__arg;
196 err = get_user(sentry.base, &s32->base);
197 err |= get_user(sentry.size, &s32->size);
198 err |= get_user(sentry.type, &s32->type);
199 if (err)
200 return err;
201 break;
202 }
203 case MTRRIOC32_GET_ENTRY:
204 case MTRRIOC32_GET_PAGE_ENTRY: {
205 struct mtrr_gentry32 __user *g32;
206
207 g32 = (struct mtrr_gentry32 __user *)__arg;
208 err = get_user(gentry.regnum, &g32->regnum);
209 err |= get_user(gentry.base, &g32->base);
210 err |= get_user(gentry.size, &g32->size);
211 err |= get_user(gentry.type, &g32->type);
212 if (err)
213 return err;
214 break;
215 }
216#endif
217 }
218
219 switch (cmd) {
220 default:
221 return -ENOTTY;
222 case MTRRIOC_ADD_ENTRY:
223#ifdef CONFIG_COMPAT
224 case MTRRIOC32_ADD_ENTRY:
225#endif
226 err =
227 mtrr_file_add(sentry.base, sentry.size, sentry.type, true,
228 file, 0);
229 break;
230 case MTRRIOC_SET_ENTRY:
231#ifdef CONFIG_COMPAT
232 case MTRRIOC32_SET_ENTRY:
233#endif
234 err = mtrr_add(sentry.base, sentry.size, sentry.type, false);
235 break;
236 case MTRRIOC_DEL_ENTRY:
237#ifdef CONFIG_COMPAT
238 case MTRRIOC32_DEL_ENTRY:
239#endif
240 err = mtrr_file_del(sentry.base, sentry.size, file, 0);
241 break;
242 case MTRRIOC_KILL_ENTRY:
243#ifdef CONFIG_COMPAT
244 case MTRRIOC32_KILL_ENTRY:
245#endif
246 err = mtrr_del(-1, sentry.base, sentry.size);
247 break;
248 case MTRRIOC_GET_ENTRY:
249#ifdef CONFIG_COMPAT
250 case MTRRIOC32_GET_ENTRY:
251#endif
252 if (gentry.regnum >= num_var_ranges)
253 return -EINVAL;
254 mtrr_if->get(gentry.regnum, &base, &size, &type);
255
256 /* Hide entries that go above 4GB */
257 if (base + size - 1 >= (1UL << (8 * sizeof(gentry.size) - PAGE_SHIFT))
258 || size >= (1UL << (8 * sizeof(gentry.size) - PAGE_SHIFT)))
259 gentry.base = gentry.size = gentry.type = 0;
260 else {
261 gentry.base = base << PAGE_SHIFT;
262 gentry.size = size << PAGE_SHIFT;
263 gentry.type = type;
264 }
265
266 break;
267 case MTRRIOC_ADD_PAGE_ENTRY:
268#ifdef CONFIG_COMPAT
269 case MTRRIOC32_ADD_PAGE_ENTRY:
270#endif
271 err =
272 mtrr_file_add(sentry.base, sentry.size, sentry.type, true,
273 file, 1);
274 break;
275 case MTRRIOC_SET_PAGE_ENTRY:
276#ifdef CONFIG_COMPAT
277 case MTRRIOC32_SET_PAGE_ENTRY:
278#endif
279 err =
280 mtrr_add_page(sentry.base, sentry.size, sentry.type, false);
281 break;
282 case MTRRIOC_DEL_PAGE_ENTRY:
283#ifdef CONFIG_COMPAT
284 case MTRRIOC32_DEL_PAGE_ENTRY:
285#endif
286 err = mtrr_file_del(sentry.base, sentry.size, file, 1);
287 break;
288 case MTRRIOC_KILL_PAGE_ENTRY:
289#ifdef CONFIG_COMPAT
290 case MTRRIOC32_KILL_PAGE_ENTRY:
291#endif
292 err = mtrr_del_page(-1, sentry.base, sentry.size);
293 break;
294 case MTRRIOC_GET_PAGE_ENTRY:
295#ifdef CONFIG_COMPAT
296 case MTRRIOC32_GET_PAGE_ENTRY:
297#endif
298 if (gentry.regnum >= num_var_ranges)
299 return -EINVAL;
300 mtrr_if->get(gentry.regnum, &base, &size, &type);
301 /* Hide entries that would overflow */
302 if (size != (__typeof__(gentry.size))size)
303 gentry.base = gentry.size = gentry.type = 0;
304 else {
305 gentry.base = base;
306 gentry.size = size;
307 gentry.type = type;
308 }
309 break;
310 }
311
312 if (err)
313 return err;
314
315 switch (cmd) {
316 case MTRRIOC_GET_ENTRY:
317 case MTRRIOC_GET_PAGE_ENTRY:
318 if (copy_to_user(arg, &gentry, sizeof(gentry)))
319 err = -EFAULT;
320 break;
321#ifdef CONFIG_COMPAT
322 case MTRRIOC32_GET_ENTRY:
323 case MTRRIOC32_GET_PAGE_ENTRY: {
324 struct mtrr_gentry32 __user *g32;
325
326 g32 = (struct mtrr_gentry32 __user *)__arg;
327 err = put_user(gentry.base, &g32->base);
328 err |= put_user(gentry.size, &g32->size);
329 err |= put_user(gentry.regnum, &g32->regnum);
330 err |= put_user(gentry.type, &g32->type);
331 break;
332 }
333#endif
334 }
335 return err;
336}
337
338static int mtrr_close(struct inode *ino, struct file *file)
339{
340 unsigned int *fcount = FILE_FCOUNT(file);
341 int i, max;
342
343 if (fcount != NULL) {
344 max = num_var_ranges;
345 for (i = 0; i < max; ++i) {
346 while (fcount[i] > 0) {
347 mtrr_del(i, 0, 0);
348 --fcount[i];
349 }
350 }
351 kfree(fcount);
352 FILE_FCOUNT(file) = NULL;
353 }
354 return single_release(ino, file);
355}
356
357static int mtrr_seq_show(struct seq_file *seq, void *offset)
358{
359 char factor;
360 int i, max;
361 mtrr_type type;
362 unsigned long base, size;
363
364 max = num_var_ranges;
365 for (i = 0; i < max; i++) {
366 mtrr_if->get(i, &base, &size, &type);
367 if (size == 0) {
368 mtrr_usage_table[i] = 0;
369 continue;
370 }
371 if (size < (0x100000 >> PAGE_SHIFT)) {
372 /* less than 1MB */
373 factor = 'K';
374 size <<= PAGE_SHIFT - 10;
375 } else {
376 factor = 'M';
377 size >>= 20 - PAGE_SHIFT;
378 }
379 /* Base can be > 32bit */
380 seq_printf(seq, "reg%02i: base=0x%06lx000 (%5luMB), size=%5lu%cB, count=%d: %s\n",
381 i, base, base >> (20 - PAGE_SHIFT),
382 size, factor,
383 mtrr_usage_table[i], mtrr_attrib_to_str(type));
384 }
385 return 0;
386}
387
388static int mtrr_open(struct inode *inode, struct file *file)
389{
390 if (!mtrr_if)
391 return -EIO;
392 if (!mtrr_if->get)
393 return -ENXIO;
394 if (!capable(CAP_SYS_ADMIN))
395 return -EPERM;
396 return single_open(file, mtrr_seq_show, NULL);
397}
398
399static const struct proc_ops mtrr_proc_ops = {
400 .proc_open = mtrr_open,
401 .proc_read = seq_read,
402 .proc_lseek = seq_lseek,
403 .proc_write = mtrr_write,
404 .proc_ioctl = mtrr_ioctl,
405#ifdef CONFIG_COMPAT
406 .proc_compat_ioctl = mtrr_ioctl,
407#endif
408 .proc_release = mtrr_close,
409};
410
411static int __init mtrr_if_init(void)
412{
413 struct cpuinfo_x86 *c = &boot_cpu_data;
414
415 if ((!cpu_has(c, X86_FEATURE_MTRR)) &&
416 (!cpu_has(c, X86_FEATURE_K6_MTRR)) &&
417 (!cpu_has(c, X86_FEATURE_CYRIX_ARR)) &&
418 (!cpu_has(c, X86_FEATURE_CENTAUR_MCR)))
419 return -ENODEV;
420
421 proc_create("mtrr", S_IWUSR | S_IRUGO, NULL, &mtrr_proc_ops);
422 return 0;
423}
424arch_initcall(mtrr_if_init);
425#endif /* CONFIG_PROC_FS */