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Linux/arch/x86/kernel/cpu/mtrr/if.c

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  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 
 19 static 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 
 30 const char *mtrr_attrib_to_str(int x)
 31 {
 32         return (x <= 6) ? mtrr_strings[x] : "?";
 33 }
 34 
 35 #ifdef CONFIG_PROC_FS
 36 
 37 static int
 38 mtrr_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 
 63 static int
 64 mtrr_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  */
 93 static ssize_t
 94 mtrr_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         len = min_t(size_t, len, LINE_SIZE - 1);
110         length = strncpy_from_user(line, buf, len);
111         if (length < 0)
112                 return length;
113 
114         linelen = strlen(line);
115         ptr = line + linelen - 1;
116         if (linelen && *ptr == '\n')
117                 *ptr = '\0';
118 
119         if (!strncmp(line, "disable=", 8)) {
120                 reg = simple_strtoul(line + 8, &ptr, 0);
121                 err = mtrr_del_page(reg, 0, 0);
122                 if (err < 0)
123                         return err;
124                 return len;
125         }
126 
127         if (strncmp(line, "base=", 5))
128                 return -EINVAL;
129 
130         base = simple_strtoull(line + 5, &ptr, 0);
131         ptr = skip_spaces(ptr);
132 
133         if (strncmp(ptr, "size=", 5))
134                 return -EINVAL;
135 
136         size = simple_strtoull(ptr + 5, &ptr, 0);
137         if ((base & 0xfff) || (size & 0xfff))
138                 return -EINVAL;
139         ptr = skip_spaces(ptr);
140 
141         if (strncmp(ptr, "type=", 5))
142                 return -EINVAL;
143         ptr = skip_spaces(ptr + 5);
144 
145         i = match_string(mtrr_strings, MTRR_NUM_TYPES, ptr);
146         if (i < 0)
147                 return i;
148 
149         base >>= PAGE_SHIFT;
150         size >>= PAGE_SHIFT;
151         err = mtrr_add_page((unsigned long)base, (unsigned long)size, i, true);
152         if (err < 0)
153                 return err;
154         return len;
155 }
156 
157 static long
158 mtrr_ioctl(struct file *file, unsigned int cmd, unsigned long __arg)
159 {
160         int err = 0;
161         mtrr_type type;
162         unsigned long base;
163         unsigned long size;
164         struct mtrr_sentry sentry;
165         struct mtrr_gentry gentry;
166         void __user *arg = (void __user *) __arg;
167 
168         memset(&gentry, 0, sizeof(gentry));
169 
170         switch (cmd) {
171         case MTRRIOC_ADD_ENTRY:
172         case MTRRIOC_SET_ENTRY:
173         case MTRRIOC_DEL_ENTRY:
174         case MTRRIOC_KILL_ENTRY:
175         case MTRRIOC_ADD_PAGE_ENTRY:
176         case MTRRIOC_SET_PAGE_ENTRY:
177         case MTRRIOC_DEL_PAGE_ENTRY:
178         case MTRRIOC_KILL_PAGE_ENTRY:
179                 if (copy_from_user(&sentry, arg, sizeof(sentry)))
180                         return -EFAULT;
181                 break;
182         case MTRRIOC_GET_ENTRY:
183         case MTRRIOC_GET_PAGE_ENTRY:
184                 if (copy_from_user(&gentry, arg, sizeof(gentry)))
185                         return -EFAULT;
186                 break;
187 #ifdef CONFIG_COMPAT
188         case MTRRIOC32_ADD_ENTRY:
189         case MTRRIOC32_SET_ENTRY:
190         case MTRRIOC32_DEL_ENTRY:
191         case MTRRIOC32_KILL_ENTRY:
192         case MTRRIOC32_ADD_PAGE_ENTRY:
193         case MTRRIOC32_SET_PAGE_ENTRY:
194         case MTRRIOC32_DEL_PAGE_ENTRY:
195         case MTRRIOC32_KILL_PAGE_ENTRY: {
196                 struct mtrr_sentry32 __user *s32;
197 
198                 s32 = (struct mtrr_sentry32 __user *)__arg;
199                 err = get_user(sentry.base, &s32->base);
200                 err |= get_user(sentry.size, &s32->size);
201                 err |= get_user(sentry.type, &s32->type);
202                 if (err)
203                         return err;
204                 break;
205         }
206         case MTRRIOC32_GET_ENTRY:
207         case MTRRIOC32_GET_PAGE_ENTRY: {
208                 struct mtrr_gentry32 __user *g32;
209 
210                 g32 = (struct mtrr_gentry32 __user *)__arg;
211                 err = get_user(gentry.regnum, &g32->regnum);
212                 err |= get_user(gentry.base, &g32->base);
213                 err |= get_user(gentry.size, &g32->size);
214                 err |= get_user(gentry.type, &g32->type);
215                 if (err)
216                         return err;
217                 break;
218         }
219 #endif
220         }
221 
222         switch (cmd) {
223         default:
224                 return -ENOTTY;
225         case MTRRIOC_ADD_ENTRY:
226 #ifdef CONFIG_COMPAT
227         case MTRRIOC32_ADD_ENTRY:
228 #endif
229                 if (!capable(CAP_SYS_ADMIN))
230                         return -EPERM;
231                 err =
232                     mtrr_file_add(sentry.base, sentry.size, sentry.type, true,
233                                   file, 0);
234                 break;
235         case MTRRIOC_SET_ENTRY:
236 #ifdef CONFIG_COMPAT
237         case MTRRIOC32_SET_ENTRY:
238 #endif
239                 if (!capable(CAP_SYS_ADMIN))
240                         return -EPERM;
241                 err = mtrr_add(sentry.base, sentry.size, sentry.type, false);
242                 break;
243         case MTRRIOC_DEL_ENTRY:
244 #ifdef CONFIG_COMPAT
245         case MTRRIOC32_DEL_ENTRY:
246 #endif
247                 if (!capable(CAP_SYS_ADMIN))
248                         return -EPERM;
249                 err = mtrr_file_del(sentry.base, sentry.size, file, 0);
250                 break;
251         case MTRRIOC_KILL_ENTRY:
252 #ifdef CONFIG_COMPAT
253         case MTRRIOC32_KILL_ENTRY:
254 #endif
255                 if (!capable(CAP_SYS_ADMIN))
256                         return -EPERM;
257                 err = mtrr_del(-1, sentry.base, sentry.size);
258                 break;
259         case MTRRIOC_GET_ENTRY:
260 #ifdef CONFIG_COMPAT
261         case MTRRIOC32_GET_ENTRY:
262 #endif
263                 if (gentry.regnum >= num_var_ranges)
264                         return -EINVAL;
265                 mtrr_if->get(gentry.regnum, &base, &size, &type);
266 
267                 /* Hide entries that go above 4GB */
268                 if (base + size - 1 >= (1UL << (8 * sizeof(gentry.size) - PAGE_SHIFT))
269                     || size >= (1UL << (8 * sizeof(gentry.size) - PAGE_SHIFT)))
270                         gentry.base = gentry.size = gentry.type = 0;
271                 else {
272                         gentry.base = base << PAGE_SHIFT;
273                         gentry.size = size << PAGE_SHIFT;
274                         gentry.type = type;
275                 }
276 
277                 break;
278         case MTRRIOC_ADD_PAGE_ENTRY:
279 #ifdef CONFIG_COMPAT
280         case MTRRIOC32_ADD_PAGE_ENTRY:
281 #endif
282                 if (!capable(CAP_SYS_ADMIN))
283                         return -EPERM;
284                 err =
285                     mtrr_file_add(sentry.base, sentry.size, sentry.type, true,
286                                   file, 1);
287                 break;
288         case MTRRIOC_SET_PAGE_ENTRY:
289 #ifdef CONFIG_COMPAT
290         case MTRRIOC32_SET_PAGE_ENTRY:
291 #endif
292                 if (!capable(CAP_SYS_ADMIN))
293                         return -EPERM;
294                 err =
295                     mtrr_add_page(sentry.base, sentry.size, sentry.type, false);
296                 break;
297         case MTRRIOC_DEL_PAGE_ENTRY:
298 #ifdef CONFIG_COMPAT
299         case MTRRIOC32_DEL_PAGE_ENTRY:
300 #endif
301                 if (!capable(CAP_SYS_ADMIN))
302                         return -EPERM;
303                 err = mtrr_file_del(sentry.base, sentry.size, file, 1);
304                 break;
305         case MTRRIOC_KILL_PAGE_ENTRY:
306 #ifdef CONFIG_COMPAT
307         case MTRRIOC32_KILL_PAGE_ENTRY:
308 #endif
309                 if (!capable(CAP_SYS_ADMIN))
310                         return -EPERM;
311                 err = mtrr_del_page(-1, sentry.base, sentry.size);
312                 break;
313         case MTRRIOC_GET_PAGE_ENTRY:
314 #ifdef CONFIG_COMPAT
315         case MTRRIOC32_GET_PAGE_ENTRY:
316 #endif
317                 if (gentry.regnum >= num_var_ranges)
318                         return -EINVAL;
319                 mtrr_if->get(gentry.regnum, &base, &size, &type);
320                 /* Hide entries that would overflow */
321                 if (size != (__typeof__(gentry.size))size)
322                         gentry.base = gentry.size = gentry.type = 0;
323                 else {
324                         gentry.base = base;
325                         gentry.size = size;
326                         gentry.type = type;
327                 }
328                 break;
329         }
330 
331         if (err)
332                 return err;
333 
334         switch (cmd) {
335         case MTRRIOC_GET_ENTRY:
336         case MTRRIOC_GET_PAGE_ENTRY:
337                 if (copy_to_user(arg, &gentry, sizeof(gentry)))
338                         err = -EFAULT;
339                 break;
340 #ifdef CONFIG_COMPAT
341         case MTRRIOC32_GET_ENTRY:
342         case MTRRIOC32_GET_PAGE_ENTRY: {
343                 struct mtrr_gentry32 __user *g32;
344 
345                 g32 = (struct mtrr_gentry32 __user *)__arg;
346                 err = put_user(gentry.base, &g32->base);
347                 err |= put_user(gentry.size, &g32->size);
348                 err |= put_user(gentry.regnum, &g32->regnum);
349                 err |= put_user(gentry.type, &g32->type);
350                 break;
351         }
352 #endif
353         }
354         return err;
355 }
356 
357 static int mtrr_close(struct inode *ino, struct file *file)
358 {
359         unsigned int *fcount = FILE_FCOUNT(file);
360         int i, max;
361 
362         if (fcount != NULL) {
363                 max = num_var_ranges;
364                 for (i = 0; i < max; ++i) {
365                         while (fcount[i] > 0) {
366                                 mtrr_del(i, 0, 0);
367                                 --fcount[i];
368                         }
369                 }
370                 kfree(fcount);
371                 FILE_FCOUNT(file) = NULL;
372         }
373         return single_release(ino, file);
374 }
375 
376 static int mtrr_seq_show(struct seq_file *seq, void *offset);
377 
378 static int mtrr_open(struct inode *inode, struct file *file)
379 {
380         if (!mtrr_if)
381                 return -EIO;
382         if (!mtrr_if->get)
383                 return -ENXIO;
384         return single_open(file, mtrr_seq_show, NULL);
385 }
386 
387 static const struct file_operations mtrr_fops = {
388         .owner                  = THIS_MODULE,
389         .open                   = mtrr_open,
390         .read                   = seq_read,
391         .llseek                 = seq_lseek,
392         .write                  = mtrr_write,
393         .unlocked_ioctl         = mtrr_ioctl,
394         .compat_ioctl           = mtrr_ioctl,
395         .release                = mtrr_close,
396 };
397 
398 static int mtrr_seq_show(struct seq_file *seq, void *offset)
399 {
400         char factor;
401         int i, max;
402         mtrr_type type;
403         unsigned long base, size;
404 
405         max = num_var_ranges;
406         for (i = 0; i < max; i++) {
407                 mtrr_if->get(i, &base, &size, &type);
408                 if (size == 0) {
409                         mtrr_usage_table[i] = 0;
410                         continue;
411                 }
412                 if (size < (0x100000 >> PAGE_SHIFT)) {
413                         /* less than 1MB */
414                         factor = 'K';
415                         size <<= PAGE_SHIFT - 10;
416                 } else {
417                         factor = 'M';
418                         size >>= 20 - PAGE_SHIFT;
419                 }
420                 /* Base can be > 32bit */
421                 seq_printf(seq, "reg%02i: base=0x%06lx000 (%5luMB), size=%5lu%cB, count=%d: %s\n",
422                            i, base, base >> (20 - PAGE_SHIFT),
423                            size, factor,
424                            mtrr_usage_table[i], mtrr_attrib_to_str(type));
425         }
426         return 0;
427 }
428 
429 static int __init mtrr_if_init(void)
430 {
431         struct cpuinfo_x86 *c = &boot_cpu_data;
432 
433         if ((!cpu_has(c, X86_FEATURE_MTRR)) &&
434             (!cpu_has(c, X86_FEATURE_K6_MTRR)) &&
435             (!cpu_has(c, X86_FEATURE_CYRIX_ARR)) &&
436             (!cpu_has(c, X86_FEATURE_CENTAUR_MCR)))
437                 return -ENODEV;
438 
439         proc_create("mtrr", S_IWUSR | S_IRUGO, NULL, &mtrr_fops);
440         return 0;
441 }
442 arch_initcall(mtrr_if_init);
443 #endif                  /*  CONFIG_PROC_FS  */
444 

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