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Merge branch 'linus' into cpus4096
[linux-2.6/mini2440.git] / fs / proc / proc_misc.c
blobc652d469dc08deeb25b057ca4675d857b9db79bb
1 /*
2 * linux/fs/proc/proc_misc.c
3 *
4 * linux/fs/proc/array.c
5 * Copyright (C) 1992 by Linus Torvalds
6 * based on ideas by Darren Senn
7 *
8 * This used to be the part of array.c. See the rest of history and credits
9 * there. I took this into a separate file and switched the thing to generic
10 * proc_file_inode_operations, leaving in array.c only per-process stuff.
11 * Inumbers allocation made dynamic (via create_proc_entry()). AV, May 1999.
12 *
13 * Changes:
14 * Fulton Green : Encapsulated position metric calculations.
15 * <kernel@FultonGreen.com>
16 */
17
18 #include <linux/types.h>
19 #include <linux/errno.h>
20 #include <linux/time.h>
21 #include <linux/kernel.h>
22 #include <linux/kernel_stat.h>
23 #include <linux/fs.h>
24 #include <linux/tty.h>
25 #include <linux/string.h>
26 #include <linux/mman.h>
27 #include <linux/proc_fs.h>
28 #include <linux/ioport.h>
29 #include <linux/mm.h>
30 #include <linux/mmzone.h>
31 #include <linux/pagemap.h>
32 #include <linux/interrupt.h>
33 #include <linux/swap.h>
34 #include <linux/slab.h>
35 #include <linux/genhd.h>
36 #include <linux/smp.h>
37 #include <linux/signal.h>
38 #include <linux/module.h>
39 #include <linux/init.h>
40 #include <linux/seq_file.h>
41 #include <linux/times.h>
42 #include <linux/profile.h>
43 #include <linux/utsname.h>
44 #include <linux/blkdev.h>
45 #include <linux/hugetlb.h>
46 #include <linux/jiffies.h>
47 #include <linux/sysrq.h>
48 #include <linux/vmalloc.h>
49 #include <linux/crash_dump.h>
50 #include <linux/pid_namespace.h>
51 #include <linux/bootmem.h>
52 #include <asm/uaccess.h>
53 #include <asm/pgtable.h>
54 #include <asm/io.h>
55 #include <asm/tlb.h>
56 #include <asm/div64.h>
57 #include "internal.h"
58
59 #define LOAD_INT(x) ((x) >> FSHIFT)
60 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
61 /*
62 * Warning: stuff below (imported functions) assumes that its output will fit
63 * into one page. For some of those functions it may be wrong. Moreover, we
64 * have a way to deal with that gracefully. Right now I used straightforward
65 * wrappers, but this needs further analysis wrt potential overflows.
66 */
67 extern int get_hardware_list(char *);
68 extern int get_stram_list(char *);
69 extern int get_exec_domain_list(char *);
70 extern int get_dma_list(char *);
71
72 static int proc_calc_metrics(char *page, char **start, off_t off,
73 int count, int *eof, int len)
74 {
75 if (len <= off+count) *eof = 1;
76 *start = page + off;
77 len -= off;
78 if (len>count) len = count;
79 if (len<0) len = 0;
80 return len;
81 }
82
83 static int loadavg_read_proc(char *page, char **start, off_t off,
84 int count, int *eof, void *data)
85 {
86 int a, b, c;
87 int len;
88 unsigned long seq;
89
90 do {
91 seq = read_seqbegin(&xtime_lock);
92 a = avenrun[0] + (FIXED_1/200);
93 b = avenrun[1] + (FIXED_1/200);
94 c = avenrun[2] + (FIXED_1/200);
95 } while (read_seqretry(&xtime_lock, seq));
96
97 len = sprintf(page,"%d.%02d %d.%02d %d.%02d %ld/%d %d\n",
98 LOAD_INT(a), LOAD_FRAC(a),
99 LOAD_INT(b), LOAD_FRAC(b),
100 LOAD_INT(c), LOAD_FRAC(c),
101 nr_running(), nr_threads,
102 task_active_pid_ns(current)->last_pid);
103 return proc_calc_metrics(page, start, off, count, eof, len);
104 }
105
106 static int uptime_read_proc(char *page, char **start, off_t off,
107 int count, int *eof, void *data)
108 {
109 struct timespec uptime;
110 struct timespec idle;
111 int len;
112 cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
113
114 do_posix_clock_monotonic_gettime(&uptime);
115 monotonic_to_bootbased(&uptime);
116 cputime_to_timespec(idletime, &idle);
117 len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
118 (unsigned long) uptime.tv_sec,
119 (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
120 (unsigned long) idle.tv_sec,
121 (idle.tv_nsec / (NSEC_PER_SEC / 100)));
122
123 return proc_calc_metrics(page, start, off, count, eof, len);
124 }
125
126 int __attribute__((weak)) arch_report_meminfo(char *page)
127 {
128 return 0;
129 }
130
131 static int meminfo_read_proc(char *page, char **start, off_t off,
132 int count, int *eof, void *data)
133 {
134 struct sysinfo i;
135 int len;
136 unsigned long committed;
137 unsigned long allowed;
138 struct vmalloc_info vmi;
139 long cached;
140
141 /*
142 * display in kilobytes.
143 */
144 #define K(x) ((x) << (PAGE_SHIFT - 10))
145 si_meminfo(&i);
146 si_swapinfo(&i);
147 committed = atomic_long_read(&vm_committed_space);
148 allowed = ((totalram_pages - hugetlb_total_pages())
149 * sysctl_overcommit_ratio / 100) + total_swap_pages;
150
151 cached = global_page_state(NR_FILE_PAGES) -
152 total_swapcache_pages - i.bufferram;
153 if (cached < 0)
154 cached = 0;
155
156 get_vmalloc_info(&vmi);
157
158 /*
159 * Tagged format, for easy grepping and expansion.
160 */
161 len = sprintf(page,
162 "MemTotal: %8lu kB\n"
163 "MemFree: %8lu kB\n"
164 "Buffers: %8lu kB\n"
165 "Cached: %8lu kB\n"
166 "SwapCached: %8lu kB\n"
167 "Active: %8lu kB\n"
168 "Inactive: %8lu kB\n"
169 #ifdef CONFIG_HIGHMEM
170 "HighTotal: %8lu kB\n"
171 "HighFree: %8lu kB\n"
172 "LowTotal: %8lu kB\n"
173 "LowFree: %8lu kB\n"
174 #endif
175 "SwapTotal: %8lu kB\n"
176 "SwapFree: %8lu kB\n"
177 "Dirty: %8lu kB\n"
178 "Writeback: %8lu kB\n"
179 "AnonPages: %8lu kB\n"
180 "Mapped: %8lu kB\n"
181 "Slab: %8lu kB\n"
182 "SReclaimable: %8lu kB\n"
183 "SUnreclaim: %8lu kB\n"
184 "PageTables: %8lu kB\n"
185 "NFS_Unstable: %8lu kB\n"
186 "Bounce: %8lu kB\n"
187 "WritebackTmp: %8lu kB\n"
188 "CommitLimit: %8lu kB\n"
189 "Committed_AS: %8lu kB\n"
190 "VmallocTotal: %8lu kB\n"
191 "VmallocUsed: %8lu kB\n"
192 "VmallocChunk: %8lu kB\n",
193 K(i.totalram),
194 K(i.freeram),
195 K(i.bufferram),
196 K(cached),
197 K(total_swapcache_pages),
198 K(global_page_state(NR_ACTIVE)),
199 K(global_page_state(NR_INACTIVE)),
200 #ifdef CONFIG_HIGHMEM
201 K(i.totalhigh),
202 K(i.freehigh),
203 K(i.totalram-i.totalhigh),
204 K(i.freeram-i.freehigh),
205 #endif
206 K(i.totalswap),
207 K(i.freeswap),
208 K(global_page_state(NR_FILE_DIRTY)),
209 K(global_page_state(NR_WRITEBACK)),
210 K(global_page_state(NR_ANON_PAGES)),
211 K(global_page_state(NR_FILE_MAPPED)),
212 K(global_page_state(NR_SLAB_RECLAIMABLE) +
213 global_page_state(NR_SLAB_UNRECLAIMABLE)),
214 K(global_page_state(NR_SLAB_RECLAIMABLE)),
215 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
216 K(global_page_state(NR_PAGETABLE)),
217 K(global_page_state(NR_UNSTABLE_NFS)),
218 K(global_page_state(NR_BOUNCE)),
219 K(global_page_state(NR_WRITEBACK_TEMP)),
220 K(allowed),
221 K(committed),
222 (unsigned long)VMALLOC_TOTAL >> 10,
223 vmi.used >> 10,
224 vmi.largest_chunk >> 10
225 );
226
227 len += hugetlb_report_meminfo(page + len);
228
229 len += arch_report_meminfo(page + len);
230
231 return proc_calc_metrics(page, start, off, count, eof, len);
232 #undef K
233 }
234
235 extern const struct seq_operations fragmentation_op;
236 static int fragmentation_open(struct inode *inode, struct file *file)
237 {
238 (void)inode;
239 return seq_open(file, &fragmentation_op);
240 }
241
242 static const struct file_operations fragmentation_file_operations = {
243 .open = fragmentation_open,
244 .read = seq_read,
245 .llseek = seq_lseek,
246 .release = seq_release,
247 };
248
249 extern const struct seq_operations pagetypeinfo_op;
250 static int pagetypeinfo_open(struct inode *inode, struct file *file)
251 {
252 return seq_open(file, &pagetypeinfo_op);
253 }
254
255 static const struct file_operations pagetypeinfo_file_ops = {
256 .open = pagetypeinfo_open,
257 .read = seq_read,
258 .llseek = seq_lseek,
259 .release = seq_release,
260 };
261
262 extern const struct seq_operations zoneinfo_op;
263 static int zoneinfo_open(struct inode *inode, struct file *file)
264 {
265 return seq_open(file, &zoneinfo_op);
266 }
267
268 static const struct file_operations proc_zoneinfo_file_operations = {
269 .open = zoneinfo_open,
270 .read = seq_read,
271 .llseek = seq_lseek,
272 .release = seq_release,
273 };
274
275 static int version_read_proc(char *page, char **start, off_t off,
276 int count, int *eof, void *data)
277 {
278 int len;
279
280 len = snprintf(page, PAGE_SIZE, linux_proc_banner,
281 utsname()->sysname,
282 utsname()->release,
283 utsname()->version);
284 return proc_calc_metrics(page, start, off, count, eof, len);
285 }
286
287 extern const struct seq_operations cpuinfo_op;
288 static int cpuinfo_open(struct inode *inode, struct file *file)
289 {
290 return seq_open(file, &cpuinfo_op);
291 }
292
293 static const struct file_operations proc_cpuinfo_operations = {
294 .open = cpuinfo_open,
295 .read = seq_read,
296 .llseek = seq_lseek,
297 .release = seq_release,
298 };
299
300 static int devinfo_show(struct seq_file *f, void *v)
301 {
302 int i = *(loff_t *) v;
303
304 if (i < CHRDEV_MAJOR_HASH_SIZE) {
305 if (i == 0)
306 seq_printf(f, "Character devices:\n");
307 chrdev_show(f, i);
308 }
309 #ifdef CONFIG_BLOCK
310 else {
311 i -= CHRDEV_MAJOR_HASH_SIZE;
312 if (i == 0)
313 seq_printf(f, "\nBlock devices:\n");
314 blkdev_show(f, i);
315 }
316 #endif
317 return 0;
318 }
319
320 static void *devinfo_start(struct seq_file *f, loff_t *pos)
321 {
322 if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
323 return pos;
324 return NULL;
325 }
326
327 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
328 {
329 (*pos)++;
330 if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
331 return NULL;
332 return pos;
333 }
334
335 static void devinfo_stop(struct seq_file *f, void *v)
336 {
337 /* Nothing to do */
338 }
339
340 static const struct seq_operations devinfo_ops = {
341 .start = devinfo_start,
342 .next = devinfo_next,
343 .stop = devinfo_stop,
344 .show = devinfo_show
345 };
346
347 static int devinfo_open(struct inode *inode, struct file *filp)
348 {
349 return seq_open(filp, &devinfo_ops);
350 }
351
352 static const struct file_operations proc_devinfo_operations = {
353 .open = devinfo_open,
354 .read = seq_read,
355 .llseek = seq_lseek,
356 .release = seq_release,
357 };
358
359 extern const struct seq_operations vmstat_op;
360 static int vmstat_open(struct inode *inode, struct file *file)
361 {
362 return seq_open(file, &vmstat_op);
363 }
364 static const struct file_operations proc_vmstat_file_operations = {
365 .open = vmstat_open,
366 .read = seq_read,
367 .llseek = seq_lseek,
368 .release = seq_release,
369 };
370
371 #ifdef CONFIG_PROC_HARDWARE
372 static int hardware_read_proc(char *page, char **start, off_t off,
373 int count, int *eof, void *data)
374 {
375 int len = get_hardware_list(page);
376 return proc_calc_metrics(page, start, off, count, eof, len);
377 }
378 #endif
379
380 #ifdef CONFIG_STRAM_PROC
381 static int stram_read_proc(char *page, char **start, off_t off,
382 int count, int *eof, void *data)
383 {
384 int len = get_stram_list(page);
385 return proc_calc_metrics(page, start, off, count, eof, len);
386 }
387 #endif
388
389 #ifdef CONFIG_BLOCK
390 static int partitions_open(struct inode *inode, struct file *file)
391 {
392 return seq_open(file, &partitions_op);
393 }
394 static const struct file_operations proc_partitions_operations = {
395 .open = partitions_open,
396 .read = seq_read,
397 .llseek = seq_lseek,
398 .release = seq_release,
399 };
400
401 static int diskstats_open(struct inode *inode, struct file *file)
402 {
403 return seq_open(file, &diskstats_op);
404 }
405 static const struct file_operations proc_diskstats_operations = {
406 .open = diskstats_open,
407 .read = seq_read,
408 .llseek = seq_lseek,
409 .release = seq_release,
410 };
411 #endif
412
413 #ifdef CONFIG_MODULES
414 extern const struct seq_operations modules_op;
415 static int modules_open(struct inode *inode, struct file *file)
416 {
417 return seq_open(file, &modules_op);
418 }
419 static const struct file_operations proc_modules_operations = {
420 .open = modules_open,
421 .read = seq_read,
422 .llseek = seq_lseek,
423 .release = seq_release,
424 };
425 #endif
426
427 #ifdef CONFIG_SLABINFO
428 static int slabinfo_open(struct inode *inode, struct file *file)
429 {
430 return seq_open(file, &slabinfo_op);
431 }
432 static const struct file_operations proc_slabinfo_operations = {
433 .open = slabinfo_open,
434 .read = seq_read,
435 .write = slabinfo_write,
436 .llseek = seq_lseek,
437 .release = seq_release,
438 };
439
440 #ifdef CONFIG_DEBUG_SLAB_LEAK
441 extern const struct seq_operations slabstats_op;
442 static int slabstats_open(struct inode *inode, struct file *file)
443 {
444 unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
445 int ret = -ENOMEM;
446 if (n) {
447 ret = seq_open(file, &slabstats_op);
448 if (!ret) {
449 struct seq_file *m = file->private_data;
450 *n = PAGE_SIZE / (2 * sizeof(unsigned long));
451 m->private = n;
452 n = NULL;
453 }
454 kfree(n);
455 }
456 return ret;
457 }
458
459 static const struct file_operations proc_slabstats_operations = {
460 .open = slabstats_open,
461 .read = seq_read,
462 .llseek = seq_lseek,
463 .release = seq_release_private,
464 };
465 #endif
466 #endif
467
468 #ifdef CONFIG_MMU
469 static int vmalloc_open(struct inode *inode, struct file *file)
470 {
471 return seq_open(file, &vmalloc_op);
472 }
473
474 static const struct file_operations proc_vmalloc_operations = {
475 .open = vmalloc_open,
476 .read = seq_read,
477 .llseek = seq_lseek,
478 .release = seq_release,
479 };
480 #endif
481
482 #ifndef arch_irq_stat_cpu
483 #define arch_irq_stat_cpu(cpu) 0
484 #endif
485 #ifndef arch_irq_stat
486 #define arch_irq_stat() 0
487 #endif
488
489 static int show_stat(struct seq_file *p, void *v)
490 {
491 int i;
492 unsigned long jif;
493 cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
494 cputime64_t guest;
495 u64 sum = 0;
496 struct timespec boottime;
497 unsigned int *per_irq_sum;
498
499 per_irq_sum = kzalloc(sizeof(unsigned int)*NR_IRQS, GFP_KERNEL);
500 if (!per_irq_sum)
501 return -ENOMEM;
502
503 user = nice = system = idle = iowait =
504 irq = softirq = steal = cputime64_zero;
505 guest = cputime64_zero;
506 getboottime(&boottime);
507 jif = boottime.tv_sec;
508
509 for_each_possible_cpu(i) {
510 int j;
511
512 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
513 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
514 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
515 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
516 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
517 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
518 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
519 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
520 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
521 for (j = 0; j < NR_IRQS; j++) {
522 unsigned int temp = kstat_cpu(i).irqs[j];
523 sum += temp;
524 per_irq_sum[j] += temp;
525 }
526 sum += arch_irq_stat_cpu(i);
527 }
528 sum += arch_irq_stat();
529
530 seq_printf(p, "cpu %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
531 (unsigned long long)cputime64_to_clock_t(user),
532 (unsigned long long)cputime64_to_clock_t(nice),
533 (unsigned long long)cputime64_to_clock_t(system),
534 (unsigned long long)cputime64_to_clock_t(idle),
535 (unsigned long long)cputime64_to_clock_t(iowait),
536 (unsigned long long)cputime64_to_clock_t(irq),
537 (unsigned long long)cputime64_to_clock_t(softirq),
538 (unsigned long long)cputime64_to_clock_t(steal),
539 (unsigned long long)cputime64_to_clock_t(guest));
540 for_each_online_cpu(i) {
541
542 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
543 user = kstat_cpu(i).cpustat.user;
544 nice = kstat_cpu(i).cpustat.nice;
545 system = kstat_cpu(i).cpustat.system;
546 idle = kstat_cpu(i).cpustat.idle;
547 iowait = kstat_cpu(i).cpustat.iowait;
548 irq = kstat_cpu(i).cpustat.irq;
549 softirq = kstat_cpu(i).cpustat.softirq;
550 steal = kstat_cpu(i).cpustat.steal;
551 guest = kstat_cpu(i).cpustat.guest;
552 seq_printf(p,
553 "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
554 i,
555 (unsigned long long)cputime64_to_clock_t(user),
556 (unsigned long long)cputime64_to_clock_t(nice),
557 (unsigned long long)cputime64_to_clock_t(system),
558 (unsigned long long)cputime64_to_clock_t(idle),
559 (unsigned long long)cputime64_to_clock_t(iowait),
560 (unsigned long long)cputime64_to_clock_t(irq),
561 (unsigned long long)cputime64_to_clock_t(softirq),
562 (unsigned long long)cputime64_to_clock_t(steal),
563 (unsigned long long)cputime64_to_clock_t(guest));
564 }
565 seq_printf(p, "intr %llu", (unsigned long long)sum);
566
567 for (i = 0; i < NR_IRQS; i++)
568 seq_printf(p, " %u", per_irq_sum[i]);
569
570 seq_printf(p,
571 "\nctxt %llu\n"
572 "btime %lu\n"
573 "processes %lu\n"
574 "procs_running %lu\n"
575 "procs_blocked %lu\n",
576 nr_context_switches(),
577 (unsigned long)jif,
578 total_forks,
579 nr_running(),
580 nr_iowait());
581
582 kfree(per_irq_sum);
583 return 0;
584 }
585
586 static int stat_open(struct inode *inode, struct file *file)
587 {
588 unsigned size = 4096 * (1 + num_possible_cpus() / 32);
589 char *buf;
590 struct seq_file *m;
591 int res;
592
593 /* don't ask for more than the kmalloc() max size, currently 128 KB */
594 if (size > 128 * 1024)
595 size = 128 * 1024;
596 buf = kmalloc(size, GFP_KERNEL);
597 if (!buf)
598 return -ENOMEM;
599
600 res = single_open(file, show_stat, NULL);
601 if (!res) {
602 m = file->private_data;
603 m->buf = buf;
604 m->size = size;
605 } else
606 kfree(buf);
607 return res;
608 }
609 static const struct file_operations proc_stat_operations = {
610 .open = stat_open,
611 .read = seq_read,
612 .llseek = seq_lseek,
613 .release = single_release,
614 };
615
616 /*
617 * /proc/interrupts
618 */
619 static void *int_seq_start(struct seq_file *f, loff_t *pos)
620 {
621 return (*pos <= NR_IRQS) ? pos : NULL;
622 }
623
624 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
625 {
626 (*pos)++;
627 if (*pos > NR_IRQS)
628 return NULL;
629 return pos;
630 }
631
632 static void int_seq_stop(struct seq_file *f, void *v)
633 {
634 /* Nothing to do */
635 }
636
637
638 static const struct seq_operations int_seq_ops = {
639 .start = int_seq_start,
640 .next = int_seq_next,
641 .stop = int_seq_stop,
642 .show = show_interrupts
643 };
644
645 static int interrupts_open(struct inode *inode, struct file *filp)
646 {
647 return seq_open(filp, &int_seq_ops);
648 }
649
650 static const struct file_operations proc_interrupts_operations = {
651 .open = interrupts_open,
652 .read = seq_read,
653 .llseek = seq_lseek,
654 .release = seq_release,
655 };
656
657 static int filesystems_read_proc(char *page, char **start, off_t off,
658 int count, int *eof, void *data)
659 {
660 int len = get_filesystem_list(page);
661 return proc_calc_metrics(page, start, off, count, eof, len);
662 }
663
664 static int cmdline_read_proc(char *page, char **start, off_t off,
665 int count, int *eof, void *data)
666 {
667 int len;
668
669 len = sprintf(page, "%s\n", saved_command_line);
670 return proc_calc_metrics(page, start, off, count, eof, len);
671 }
672
673 static int locks_open(struct inode *inode, struct file *filp)
674 {
675 return seq_open(filp, &locks_seq_operations);
676 }
677
678 static const struct file_operations proc_locks_operations = {
679 .open = locks_open,
680 .read = seq_read,
681 .llseek = seq_lseek,
682 .release = seq_release,
683 };
684
685 static int execdomains_read_proc(char *page, char **start, off_t off,
686 int count, int *eof, void *data)
687 {
688 int len = get_exec_domain_list(page);
689 return proc_calc_metrics(page, start, off, count, eof, len);
690 }
691
692 #ifdef CONFIG_MAGIC_SYSRQ
693 /*
694 * writing 'C' to /proc/sysrq-trigger is like sysrq-C
695 */
696 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
697 size_t count, loff_t *ppos)
698 {
699 if (count) {
700 char c;
701
702 if (get_user(c, buf))
703 return -EFAULT;
704 __handle_sysrq(c, NULL, 0);
705 }
706 return count;
707 }
708
709 static const struct file_operations proc_sysrq_trigger_operations = {
710 .write = write_sysrq_trigger,
711 };
712 #endif
713
714 #ifdef CONFIG_PROC_PAGE_MONITOR
715 #define KPMSIZE sizeof(u64)
716 #define KPMMASK (KPMSIZE - 1)
717 /* /proc/kpagecount - an array exposing page counts
718 *
719 * Each entry is a u64 representing the corresponding
720 * physical page count.
721 */
722 static ssize_t kpagecount_read(struct file *file, char __user *buf,
723 size_t count, loff_t *ppos)
724 {
725 u64 __user *out = (u64 __user *)buf;
726 struct page *ppage;
727 unsigned long src = *ppos;
728 unsigned long pfn;
729 ssize_t ret = 0;
730 u64 pcount;
731
732 pfn = src / KPMSIZE;
733 count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
734 if (src & KPMMASK || count & KPMMASK)
735 return -EINVAL;
736
737 while (count > 0) {
738 ppage = NULL;
739 if (pfn_valid(pfn))
740 ppage = pfn_to_page(pfn);
741 pfn++;
742 if (!ppage)
743 pcount = 0;
744 else
745 pcount = page_mapcount(ppage);
746
747 if (put_user(pcount, out++)) {
748 ret = -EFAULT;
749 break;
750 }
751
752 count -= KPMSIZE;
753 }
754
755 *ppos += (char __user *)out - buf;
756 if (!ret)
757 ret = (char __user *)out - buf;
758 return ret;
759 }
760
761 static struct file_operations proc_kpagecount_operations = {
762 .llseek = mem_lseek,
763 .read = kpagecount_read,
764 };
765
766 /* /proc/kpageflags - an array exposing page flags
767 *
768 * Each entry is a u64 representing the corresponding
769 * physical page flags.
770 */
771
772 /* These macros are used to decouple internal flags from exported ones */
773
774 #define KPF_LOCKED 0
775 #define KPF_ERROR 1
776 #define KPF_REFERENCED 2
777 #define KPF_UPTODATE 3
778 #define KPF_DIRTY 4
779 #define KPF_LRU 5
780 #define KPF_ACTIVE 6
781 #define KPF_SLAB 7
782 #define KPF_WRITEBACK 8
783 #define KPF_RECLAIM 9
784 #define KPF_BUDDY 10
785
786 #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
787
788 static ssize_t kpageflags_read(struct file *file, char __user *buf,
789 size_t count, loff_t *ppos)
790 {
791 u64 __user *out = (u64 __user *)buf;
792 struct page *ppage;
793 unsigned long src = *ppos;
794 unsigned long pfn;
795 ssize_t ret = 0;
796 u64 kflags, uflags;
797
798 pfn = src / KPMSIZE;
799 count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
800 if (src & KPMMASK || count & KPMMASK)
801 return -EINVAL;
802
803 while (count > 0) {
804 ppage = NULL;
805 if (pfn_valid(pfn))
806 ppage = pfn_to_page(pfn);
807 pfn++;
808 if (!ppage)
809 kflags = 0;
810 else
811 kflags = ppage->flags;
812
813 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
814 kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
815 kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
816 kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
817 kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
818 kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
819 kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
820 kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
821 kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
822 kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
823 kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
824
825 if (put_user(uflags, out++)) {
826 ret = -EFAULT;
827 break;
828 }
829
830 count -= KPMSIZE;
831 }
832
833 *ppos += (char __user *)out - buf;
834 if (!ret)
835 ret = (char __user *)out - buf;
836 return ret;
837 }
838
839 static struct file_operations proc_kpageflags_operations = {
840 .llseek = mem_lseek,
841 .read = kpageflags_read,
842 };
843 #endif /* CONFIG_PROC_PAGE_MONITOR */
844
845 struct proc_dir_entry *proc_root_kcore;
846
847 void __init proc_misc_init(void)
848 {
849 static struct {
850 char *name;
851 int (*read_proc)(char*,char**,off_t,int,int*,void*);
852 } *p, simple_ones[] = {
853 {"loadavg", loadavg_read_proc},
854 {"uptime", uptime_read_proc},
855 {"meminfo", meminfo_read_proc},
856 {"version", version_read_proc},
857 #ifdef CONFIG_PROC_HARDWARE
858 {"hardware", hardware_read_proc},
859 #endif
860 #ifdef CONFIG_STRAM_PROC
861 {"stram", stram_read_proc},
862 #endif
863 {"filesystems", filesystems_read_proc},
864 {"cmdline", cmdline_read_proc},
865 {"execdomains", execdomains_read_proc},
866 {NULL,}
867 };
868 for (p = simple_ones; p->name; p++)
869 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
870
871 proc_symlink("mounts", NULL, "self/mounts");
872
873 /* And now for trickier ones */
874 #ifdef CONFIG_PRINTK
875 proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
876 #endif
877 proc_create("locks", 0, NULL, &proc_locks_operations);
878 proc_create("devices", 0, NULL, &proc_devinfo_operations);
879 proc_create("cpuinfo", 0, NULL, &proc_cpuinfo_operations);
880 #ifdef CONFIG_BLOCK
881 proc_create("partitions", 0, NULL, &proc_partitions_operations);
882 #endif
883 proc_create("stat", 0, NULL, &proc_stat_operations);
884 proc_create("interrupts", 0, NULL, &proc_interrupts_operations);
885 #ifdef CONFIG_SLABINFO
886 proc_create("slabinfo",S_IWUSR|S_IRUGO,NULL,&proc_slabinfo_operations);
887 #ifdef CONFIG_DEBUG_SLAB_LEAK
888 proc_create("slab_allocators", 0, NULL, &proc_slabstats_operations);
889 #endif
890 #endif
891 #ifdef CONFIG_MMU
892 proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
893 #endif
894 proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
895 proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
896 proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
897 proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
898 #ifdef CONFIG_BLOCK
899 proc_create("diskstats", 0, NULL, &proc_diskstats_operations);
900 #endif
901 #ifdef CONFIG_MODULES
902 proc_create("modules", 0, NULL, &proc_modules_operations);
903 #endif
904 #ifdef CONFIG_SCHEDSTATS
905 proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
906 #endif
907 #ifdef CONFIG_PROC_KCORE
908 proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
909 if (proc_root_kcore)
910 proc_root_kcore->size =
911 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
912 #endif
913 #ifdef CONFIG_PROC_PAGE_MONITOR
914 proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
915 proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
916 #endif
917 #ifdef CONFIG_PROC_VMCORE
918 proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
919 #endif
920 #ifdef CONFIG_MAGIC_SYSRQ
921 proc_create("sysrq-trigger", S_IWUSR, NULL, &proc_sysrq_trigger_operations);
922 #endif
923 }
Support for the Chinese Samsung S3C2440 based development boards