ded96986296099a036af1400a1ecdd7f3f71c058
[linux-2.6.git] / fs / proc / proc_misc.c
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 }