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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6/mini2440.git] / fs / proc / proc_misc.c
blobded96986296099a036af1400a1ecdd7f3f71c058
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 static int fragmentation_open(struct inode *inode, struct file *file)
236 {
237 (void)inode;
238 return seq_open(file, &fragmentation_op);
239 }
240
241 static const struct file_operations fragmentation_file_operations = {
242 .open = fragmentation_open,
243 .read = seq_read,
244 .llseek = seq_lseek,
245 .release = seq_release,
246 };
247
248 static int pagetypeinfo_open(struct inode *inode, struct file *file)
249 {
250 return seq_open(file, &pagetypeinfo_op);
251 }
252
253 static const struct file_operations pagetypeinfo_file_ops = {
254 .open = pagetypeinfo_open,
255 .read = seq_read,
256 .llseek = seq_lseek,
257 .release = seq_release,
258 };
259
260 static int zoneinfo_open(struct inode *inode, struct file *file)
261 {
262 return seq_open(file, &zoneinfo_op);
263 }
264
265 static const struct file_operations proc_zoneinfo_file_operations = {
266 .open = zoneinfo_open,
267 .read = seq_read,
268 .llseek = seq_lseek,
269 .release = seq_release,
270 };
271
272 static int version_read_proc(char *page, char **start, off_t off,
273 int count, int *eof, void *data)
274 {
275 int len;
276
277 len = snprintf(page, PAGE_SIZE, linux_proc_banner,
278 utsname()->sysname,
279 utsname()->release,
280 utsname()->version);
281 return proc_calc_metrics(page, start, off, count, eof, len);
282 }
283
284 extern const struct seq_operations cpuinfo_op;
285 static int cpuinfo_open(struct inode *inode, struct file *file)
286 {
287 return seq_open(file, &cpuinfo_op);
288 }
289
290 static const struct file_operations proc_cpuinfo_operations = {
291 .open = cpuinfo_open,
292 .read = seq_read,
293 .llseek = seq_lseek,
294 .release = seq_release,
295 };
296
297 static int devinfo_show(struct seq_file *f, void *v)
298 {
299 int i = *(loff_t *) v;
300
301 if (i < CHRDEV_MAJOR_HASH_SIZE) {
302 if (i == 0)
303 seq_printf(f, "Character devices:\n");
304 chrdev_show(f, i);
305 }
306 #ifdef CONFIG_BLOCK
307 else {
308 i -= CHRDEV_MAJOR_HASH_SIZE;
309 if (i == 0)
310 seq_printf(f, "\nBlock devices:\n");
311 blkdev_show(f, i);
312 }
313 #endif
314 return 0;
315 }
316
317 static void *devinfo_start(struct seq_file *f, loff_t *pos)
318 {
319 if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
320 return pos;
321 return NULL;
322 }
323
324 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
325 {
326 (*pos)++;
327 if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
328 return NULL;
329 return pos;
330 }
331
332 static void devinfo_stop(struct seq_file *f, void *v)
333 {
334 /* Nothing to do */
335 }
336
337 static const struct seq_operations devinfo_ops = {
338 .start = devinfo_start,
339 .next = devinfo_next,
340 .stop = devinfo_stop,
341 .show = devinfo_show
342 };
343
344 static int devinfo_open(struct inode *inode, struct file *filp)
345 {
346 return seq_open(filp, &devinfo_ops);
347 }
348
349 static const struct file_operations proc_devinfo_operations = {
350 .open = devinfo_open,
351 .read = seq_read,
352 .llseek = seq_lseek,
353 .release = seq_release,
354 };
355
356 static int vmstat_open(struct inode *inode, struct file *file)
357 {
358 return seq_open(file, &vmstat_op);
359 }
360 static const struct file_operations proc_vmstat_file_operations = {
361 .open = vmstat_open,
362 .read = seq_read,
363 .llseek = seq_lseek,
364 .release = seq_release,
365 };
366
367 #ifdef CONFIG_PROC_HARDWARE
368 static int hardware_read_proc(char *page, char **start, off_t off,
369 int count, int *eof, void *data)
370 {
371 int len = get_hardware_list(page);
372 return proc_calc_metrics(page, start, off, count, eof, len);
373 }
374 #endif
375
376 #ifdef CONFIG_STRAM_PROC
377 static int stram_read_proc(char *page, char **start, off_t off,
378 int count, int *eof, void *data)
379 {
380 int len = get_stram_list(page);
381 return proc_calc_metrics(page, start, off, count, eof, len);
382 }
383 #endif
384
385 #ifdef CONFIG_BLOCK
386 static int partitions_open(struct inode *inode, struct file *file)
387 {
388 return seq_open(file, &partitions_op);
389 }
390 static const struct file_operations proc_partitions_operations = {
391 .open = partitions_open,
392 .read = seq_read,
393 .llseek = seq_lseek,
394 .release = seq_release,
395 };
396
397 static int diskstats_open(struct inode *inode, struct file *file)
398 {
399 return seq_open(file, &diskstats_op);
400 }
401 static const struct file_operations proc_diskstats_operations = {
402 .open = diskstats_open,
403 .read = seq_read,
404 .llseek = seq_lseek,
405 .release = seq_release,
406 };
407 #endif
408
409 #ifdef CONFIG_MODULES
410 extern const struct seq_operations modules_op;
411 static int modules_open(struct inode *inode, struct file *file)
412 {
413 return seq_open(file, &modules_op);
414 }
415 static const struct file_operations proc_modules_operations = {
416 .open = modules_open,
417 .read = seq_read,
418 .llseek = seq_lseek,
419 .release = seq_release,
420 };
421 #endif
422
423 #ifdef CONFIG_SLABINFO
424 static int slabinfo_open(struct inode *inode, struct file *file)
425 {
426 return seq_open(file, &slabinfo_op);
427 }
428 static const struct file_operations proc_slabinfo_operations = {
429 .open = slabinfo_open,
430 .read = seq_read,
431 .write = slabinfo_write,
432 .llseek = seq_lseek,
433 .release = seq_release,
434 };
435
436 #ifdef CONFIG_DEBUG_SLAB_LEAK
437 extern const struct seq_operations slabstats_op;
438 static int slabstats_open(struct inode *inode, struct file *file)
439 {
440 unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
441 int ret = -ENOMEM;
442 if (n) {
443 ret = seq_open(file, &slabstats_op);
444 if (!ret) {
445 struct seq_file *m = file->private_data;
446 *n = PAGE_SIZE / (2 * sizeof(unsigned long));
447 m->private = n;
448 n = NULL;
449 }
450 kfree(n);
451 }
452 return ret;
453 }
454
455 static const struct file_operations proc_slabstats_operations = {
456 .open = slabstats_open,
457 .read = seq_read,
458 .llseek = seq_lseek,
459 .release = seq_release_private,
460 };
461 #endif
462 #endif
463
464 #ifdef CONFIG_MMU
465 static int vmalloc_open(struct inode *inode, struct file *file)
466 {
467 unsigned int *ptr = NULL;
468 int ret;
469
470 if (NUMA_BUILD)
471 ptr = kmalloc(nr_node_ids * sizeof(unsigned int), GFP_KERNEL);
472 ret = seq_open(file, &vmalloc_op);
473 if (!ret) {
474 struct seq_file *m = file->private_data;
475 m->private = ptr;
476 } else
477 kfree(ptr);
478 return ret;
479 }
480
481 static const struct file_operations proc_vmalloc_operations = {
482 .open = vmalloc_open,
483 .read = seq_read,
484 .llseek = seq_lseek,
485 .release = seq_release_private,
486 };
487 #endif
488
489 #ifndef arch_irq_stat_cpu
490 #define arch_irq_stat_cpu(cpu) 0
491 #endif
492 #ifndef arch_irq_stat
493 #define arch_irq_stat() 0
494 #endif
495
496 static int show_stat(struct seq_file *p, void *v)
497 {
498 int i;
499 unsigned long jif;
500 cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
501 cputime64_t guest;
502 u64 sum = 0;
503 struct timespec boottime;
504 unsigned int *per_irq_sum;
505
506 per_irq_sum = kzalloc(sizeof(unsigned int)*NR_IRQS, GFP_KERNEL);
507 if (!per_irq_sum)
508 return -ENOMEM;
509
510 user = nice = system = idle = iowait =
511 irq = softirq = steal = cputime64_zero;
512 guest = cputime64_zero;
513 getboottime(&boottime);
514 jif = boottime.tv_sec;
515
516 for_each_possible_cpu(i) {
517 int j;
518
519 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
520 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
521 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
522 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
523 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
524 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
525 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
526 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
527 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
528 for (j = 0; j < NR_IRQS; j++) {
529 unsigned int temp = kstat_cpu(i).irqs[j];
530 sum += temp;
531 per_irq_sum[j] += temp;
532 }
533 sum += arch_irq_stat_cpu(i);
534 }
535 sum += arch_irq_stat();
536
537 seq_printf(p, "cpu %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
538 (unsigned long long)cputime64_to_clock_t(user),
539 (unsigned long long)cputime64_to_clock_t(nice),
540 (unsigned long long)cputime64_to_clock_t(system),
541 (unsigned long long)cputime64_to_clock_t(idle),
542 (unsigned long long)cputime64_to_clock_t(iowait),
543 (unsigned long long)cputime64_to_clock_t(irq),
544 (unsigned long long)cputime64_to_clock_t(softirq),
545 (unsigned long long)cputime64_to_clock_t(steal),
546 (unsigned long long)cputime64_to_clock_t(guest));
547 for_each_online_cpu(i) {
548
549 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
550 user = kstat_cpu(i).cpustat.user;
551 nice = kstat_cpu(i).cpustat.nice;
552 system = kstat_cpu(i).cpustat.system;
553 idle = kstat_cpu(i).cpustat.idle;
554 iowait = kstat_cpu(i).cpustat.iowait;
555 irq = kstat_cpu(i).cpustat.irq;
556 softirq = kstat_cpu(i).cpustat.softirq;
557 steal = kstat_cpu(i).cpustat.steal;
558 guest = kstat_cpu(i).cpustat.guest;
559 seq_printf(p,
560 "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
561 i,
562 (unsigned long long)cputime64_to_clock_t(user),
563 (unsigned long long)cputime64_to_clock_t(nice),
564 (unsigned long long)cputime64_to_clock_t(system),
565 (unsigned long long)cputime64_to_clock_t(idle),
566 (unsigned long long)cputime64_to_clock_t(iowait),
567 (unsigned long long)cputime64_to_clock_t(irq),
568 (unsigned long long)cputime64_to_clock_t(softirq),
569 (unsigned long long)cputime64_to_clock_t(steal),
570 (unsigned long long)cputime64_to_clock_t(guest));
571 }
572 seq_printf(p, "intr %llu", (unsigned long long)sum);
573
574 for (i = 0; i < NR_IRQS; i++)
575 seq_printf(p, " %u", per_irq_sum[i]);
576
577 seq_printf(p,
578 "\nctxt %llu\n"
579 "btime %lu\n"
580 "processes %lu\n"
581 "procs_running %lu\n"
582 "procs_blocked %lu\n",
583 nr_context_switches(),
584 (unsigned long)jif,
585 total_forks,
586 nr_running(),
587 nr_iowait());
588
589 kfree(per_irq_sum);
590 return 0;
591 }
592
593 static int stat_open(struct inode *inode, struct file *file)
594 {
595 unsigned size = 4096 * (1 + num_possible_cpus() / 32);
596 char *buf;
597 struct seq_file *m;
598 int res;
599
600 /* don't ask for more than the kmalloc() max size, currently 128 KB */
601 if (size > 128 * 1024)
602 size = 128 * 1024;
603 buf = kmalloc(size, GFP_KERNEL);
604 if (!buf)
605 return -ENOMEM;
606
607 res = single_open(file, show_stat, NULL);
608 if (!res) {
609 m = file->private_data;
610 m->buf = buf;
611 m->size = size;
612 } else
613 kfree(buf);
614 return res;
615 }
616 static const struct file_operations proc_stat_operations = {
617 .open = stat_open,
618 .read = seq_read,
619 .llseek = seq_lseek,
620 .release = single_release,
621 };
622
623 /*
624 * /proc/interrupts
625 */
626 static void *int_seq_start(struct seq_file *f, loff_t *pos)
627 {
628 return (*pos <= NR_IRQS) ? pos : NULL;
629 }
630
631 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
632 {
633 (*pos)++;
634 if (*pos > NR_IRQS)
635 return NULL;
636 return pos;
637 }
638
639 static void int_seq_stop(struct seq_file *f, void *v)
640 {
641 /* Nothing to do */
642 }
643
644
645 static const struct seq_operations int_seq_ops = {
646 .start = int_seq_start,
647 .next = int_seq_next,
648 .stop = int_seq_stop,
649 .show = show_interrupts
650 };
651
652 static int interrupts_open(struct inode *inode, struct file *filp)
653 {
654 return seq_open(filp, &int_seq_ops);
655 }
656
657 static const struct file_operations proc_interrupts_operations = {
658 .open = interrupts_open,
659 .read = seq_read,
660 .llseek = seq_lseek,
661 .release = seq_release,
662 };
663
664 static int filesystems_read_proc(char *page, char **start, off_t off,
665 int count, int *eof, void *data)
666 {
667 int len = get_filesystem_list(page);
668 return proc_calc_metrics(page, start, off, count, eof, len);
669 }
670
671 static int cmdline_read_proc(char *page, char **start, off_t off,
672 int count, int *eof, void *data)
673 {
674 int len;
675
676 len = sprintf(page, "%s\n", saved_command_line);
677 return proc_calc_metrics(page, start, off, count, eof, len);
678 }
679
680 static int locks_open(struct inode *inode, struct file *filp)
681 {
682 return seq_open(filp, &locks_seq_operations);
683 }
684
685 static const struct file_operations proc_locks_operations = {
686 .open = locks_open,
687 .read = seq_read,
688 .llseek = seq_lseek,
689 .release = seq_release,
690 };
691
692 static int execdomains_read_proc(char *page, char **start, off_t off,
693 int count, int *eof, void *data)
694 {
695 int len = get_exec_domain_list(page);
696 return proc_calc_metrics(page, start, off, count, eof, len);
697 }
698
699 #ifdef CONFIG_MAGIC_SYSRQ
700 /*
701 * writing 'C' to /proc/sysrq-trigger is like sysrq-C
702 */
703 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
704 size_t count, loff_t *ppos)
705 {
706 if (count) {
707 char c;
708
709 if (get_user(c, buf))
710 return -EFAULT;
711 __handle_sysrq(c, NULL, 0);
712 }
713 return count;
714 }
715
716 static const struct file_operations proc_sysrq_trigger_operations = {
717 .write = write_sysrq_trigger,
718 };
719 #endif
720
721 #ifdef CONFIG_PROC_PAGE_MONITOR
722 #define KPMSIZE sizeof(u64)
723 #define KPMMASK (KPMSIZE - 1)
724 /* /proc/kpagecount - an array exposing page counts
725 *
726 * Each entry is a u64 representing the corresponding
727 * physical page count.
728 */
729 static ssize_t kpagecount_read(struct file *file, char __user *buf,
730 size_t count, loff_t *ppos)
731 {
732 u64 __user *out = (u64 __user *)buf;
733 struct page *ppage;
734 unsigned long src = *ppos;
735 unsigned long pfn;
736 ssize_t ret = 0;
737 u64 pcount;
738
739 pfn = src / KPMSIZE;
740 count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
741 if (src & KPMMASK || count & KPMMASK)
742 return -EINVAL;
743
744 while (count > 0) {
745 ppage = NULL;
746 if (pfn_valid(pfn))
747 ppage = pfn_to_page(pfn);
748 pfn++;
749 if (!ppage)
750 pcount = 0;
751 else
752 pcount = page_mapcount(ppage);
753
754 if (put_user(pcount, out++)) {
755 ret = -EFAULT;
756 break;
757 }
758
759 count -= KPMSIZE;
760 }
761
762 *ppos += (char __user *)out - buf;
763 if (!ret)
764 ret = (char __user *)out - buf;
765 return ret;
766 }
767
768 static struct file_operations proc_kpagecount_operations = {
769 .llseek = mem_lseek,
770 .read = kpagecount_read,
771 };
772
773 /* /proc/kpageflags - an array exposing page flags
774 *
775 * Each entry is a u64 representing the corresponding
776 * physical page flags.
777 */
778
779 /* These macros are used to decouple internal flags from exported ones */
780
781 #define KPF_LOCKED 0
782 #define KPF_ERROR 1
783 #define KPF_REFERENCED 2
784 #define KPF_UPTODATE 3
785 #define KPF_DIRTY 4
786 #define KPF_LRU 5
787 #define KPF_ACTIVE 6
788 #define KPF_SLAB 7
789 #define KPF_WRITEBACK 8
790 #define KPF_RECLAIM 9
791 #define KPF_BUDDY 10
792
793 #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
794
795 static ssize_t kpageflags_read(struct file *file, char __user *buf,
796 size_t count, loff_t *ppos)
797 {
798 u64 __user *out = (u64 __user *)buf;
799 struct page *ppage;
800 unsigned long src = *ppos;
801 unsigned long pfn;
802 ssize_t ret = 0;
803 u64 kflags, uflags;
804
805 pfn = src / KPMSIZE;
806 count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
807 if (src & KPMMASK || count & KPMMASK)
808 return -EINVAL;
809
810 while (count > 0) {
811 ppage = NULL;
812 if (pfn_valid(pfn))
813 ppage = pfn_to_page(pfn);
814 pfn++;
815 if (!ppage)
816 kflags = 0;
817 else
818 kflags = ppage->flags;
819
820 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
821 kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
822 kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
823 kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
824 kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
825 kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
826 kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
827 kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
828 kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
829 kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
830 kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
831
832 if (put_user(uflags, out++)) {
833 ret = -EFAULT;
834 break;
835 }
836
837 count -= KPMSIZE;
838 }
839
840 *ppos += (char __user *)out - buf;
841 if (!ret)
842 ret = (char __user *)out - buf;
843 return ret;
844 }
845
846 static struct file_operations proc_kpageflags_operations = {
847 .llseek = mem_lseek,
848 .read = kpageflags_read,
849 };
850 #endif /* CONFIG_PROC_PAGE_MONITOR */
851
852 struct proc_dir_entry *proc_root_kcore;
853
854 void __init proc_misc_init(void)
855 {
856 static struct {
857 char *name;
858 int (*read_proc)(char*,char**,off_t,int,int*,void*);
859 } *p, simple_ones[] = {
860 {"loadavg", loadavg_read_proc},
861 {"uptime", uptime_read_proc},
862 {"meminfo", meminfo_read_proc},
863 {"version", version_read_proc},
864 #ifdef CONFIG_PROC_HARDWARE
865 {"hardware", hardware_read_proc},
866 #endif
867 #ifdef CONFIG_STRAM_PROC
868 {"stram", stram_read_proc},
869 #endif
870 {"filesystems", filesystems_read_proc},
871 {"cmdline", cmdline_read_proc},
872 {"execdomains", execdomains_read_proc},
873 {NULL,}
874 };
875 for (p = simple_ones; p->name; p++)
876 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
877
878 proc_symlink("mounts", NULL, "self/mounts");
879
880 /* And now for trickier ones */
881 #ifdef CONFIG_PRINTK
882 proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
883 #endif
884 proc_create("locks", 0, NULL, &proc_locks_operations);
885 proc_create("devices", 0, NULL, &proc_devinfo_operations);
886 proc_create("cpuinfo", 0, NULL, &proc_cpuinfo_operations);
887 #ifdef CONFIG_BLOCK
888 proc_create("partitions", 0, NULL, &proc_partitions_operations);
889 #endif
890 proc_create("stat", 0, NULL, &proc_stat_operations);
891 proc_create("interrupts", 0, NULL, &proc_interrupts_operations);
892 #ifdef CONFIG_SLABINFO
893 proc_create("slabinfo",S_IWUSR|S_IRUGO,NULL,&proc_slabinfo_operations);
894 #ifdef CONFIG_DEBUG_SLAB_LEAK
895 proc_create("slab_allocators", 0, NULL, &proc_slabstats_operations);
896 #endif
897 #endif
898 #ifdef CONFIG_MMU
899 proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
900 #endif
901 proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
902 proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
903 proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
904 proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
905 #ifdef CONFIG_BLOCK
906 proc_create("diskstats", 0, NULL, &proc_diskstats_operations);
907 #endif
908 #ifdef CONFIG_MODULES
909 proc_create("modules", 0, NULL, &proc_modules_operations);
910 #endif
911 #ifdef CONFIG_SCHEDSTATS
912 proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
913 #endif
914 #ifdef CONFIG_PROC_KCORE
915 proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
916 if (proc_root_kcore)
917 proc_root_kcore->size =
918 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
919 #endif
920 #ifdef CONFIG_PROC_PAGE_MONITOR
921 proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
922 proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
923 #endif
924 #ifdef CONFIG_PROC_VMCORE
925 proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
926 #endif
927 #ifdef CONFIG_MAGIC_SYSRQ
928 proc_create("sysrq-trigger", S_IWUSR, NULL, &proc_sysrq_trigger_operations);
929 #endif
930 }
Support for the Chinese Samsung S3C2440 based development boards