x86: make /proc/stat account for all interrupts
[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 static int meminfo_read_proc(char *page, char **start, off_t off,
127                                  int count, int *eof, void *data)
128 {
129         struct sysinfo i;
130         int len;
131         unsigned long committed;
132         unsigned long allowed;
133         struct vmalloc_info vmi;
134         long cached;
135
136 /*
137  * display in kilobytes.
138  */
139 #define K(x) ((x) << (PAGE_SHIFT - 10))
140         si_meminfo(&i);
141         si_swapinfo(&i);
142         committed = atomic_read(&vm_committed_space);
143         allowed = ((totalram_pages - hugetlb_total_pages())
144                 * sysctl_overcommit_ratio / 100) + total_swap_pages;
145
146         cached = global_page_state(NR_FILE_PAGES) -
147                         total_swapcache_pages - i.bufferram;
148         if (cached < 0)
149                 cached = 0;
150
151         get_vmalloc_info(&vmi);
152
153         /*
154          * Tagged format, for easy grepping and expansion.
155          */
156         len = sprintf(page,
157                 "MemTotal:     %8lu kB\n"
158                 "MemFree:      %8lu kB\n"
159                 "Buffers:      %8lu kB\n"
160                 "Cached:       %8lu kB\n"
161                 "SwapCached:   %8lu kB\n"
162                 "Active:       %8lu kB\n"
163                 "Inactive:     %8lu kB\n"
164 #ifdef CONFIG_HIGHMEM
165                 "HighTotal:    %8lu kB\n"
166                 "HighFree:     %8lu kB\n"
167                 "LowTotal:     %8lu kB\n"
168                 "LowFree:      %8lu kB\n"
169 #endif
170                 "SwapTotal:    %8lu kB\n"
171                 "SwapFree:     %8lu kB\n"
172                 "Dirty:        %8lu kB\n"
173                 "Writeback:    %8lu kB\n"
174                 "AnonPages:    %8lu kB\n"
175                 "Mapped:       %8lu kB\n"
176                 "Slab:         %8lu kB\n"
177                 "SReclaimable: %8lu kB\n"
178                 "SUnreclaim:   %8lu kB\n"
179                 "PageTables:   %8lu kB\n"
180                 "NFS_Unstable: %8lu kB\n"
181                 "Bounce:       %8lu kB\n"
182                 "WritebackTmp: %8lu kB\n"
183                 "CommitLimit:  %8lu kB\n"
184                 "Committed_AS: %8lu kB\n"
185                 "VmallocTotal: %8lu kB\n"
186                 "VmallocUsed:  %8lu kB\n"
187                 "VmallocChunk: %8lu kB\n",
188                 K(i.totalram),
189                 K(i.freeram),
190                 K(i.bufferram),
191                 K(cached),
192                 K(total_swapcache_pages),
193                 K(global_page_state(NR_ACTIVE)),
194                 K(global_page_state(NR_INACTIVE)),
195 #ifdef CONFIG_HIGHMEM
196                 K(i.totalhigh),
197                 K(i.freehigh),
198                 K(i.totalram-i.totalhigh),
199                 K(i.freeram-i.freehigh),
200 #endif
201                 K(i.totalswap),
202                 K(i.freeswap),
203                 K(global_page_state(NR_FILE_DIRTY)),
204                 K(global_page_state(NR_WRITEBACK)),
205                 K(global_page_state(NR_ANON_PAGES)),
206                 K(global_page_state(NR_FILE_MAPPED)),
207                 K(global_page_state(NR_SLAB_RECLAIMABLE) +
208                                 global_page_state(NR_SLAB_UNRECLAIMABLE)),
209                 K(global_page_state(NR_SLAB_RECLAIMABLE)),
210                 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
211                 K(global_page_state(NR_PAGETABLE)),
212                 K(global_page_state(NR_UNSTABLE_NFS)),
213                 K(global_page_state(NR_BOUNCE)),
214                 K(global_page_state(NR_WRITEBACK_TEMP)),
215                 K(allowed),
216                 K(committed),
217                 (unsigned long)VMALLOC_TOTAL >> 10,
218                 vmi.used >> 10,
219                 vmi.largest_chunk >> 10
220                 );
221
222                 len += hugetlb_report_meminfo(page + len);
223
224         return proc_calc_metrics(page, start, off, count, eof, len);
225 #undef K
226 }
227
228 extern const struct seq_operations fragmentation_op;
229 static int fragmentation_open(struct inode *inode, struct file *file)
230 {
231         (void)inode;
232         return seq_open(file, &fragmentation_op);
233 }
234
235 static const struct file_operations fragmentation_file_operations = {
236         .open           = fragmentation_open,
237         .read           = seq_read,
238         .llseek         = seq_lseek,
239         .release        = seq_release,
240 };
241
242 extern const struct seq_operations pagetypeinfo_op;
243 static int pagetypeinfo_open(struct inode *inode, struct file *file)
244 {
245         return seq_open(file, &pagetypeinfo_op);
246 }
247
248 static const struct file_operations pagetypeinfo_file_ops = {
249         .open           = pagetypeinfo_open,
250         .read           = seq_read,
251         .llseek         = seq_lseek,
252         .release        = seq_release,
253 };
254
255 extern const struct seq_operations zoneinfo_op;
256 static int zoneinfo_open(struct inode *inode, struct file *file)
257 {
258         return seq_open(file, &zoneinfo_op);
259 }
260
261 static const struct file_operations proc_zoneinfo_file_operations = {
262         .open           = zoneinfo_open,
263         .read           = seq_read,
264         .llseek         = seq_lseek,
265         .release        = seq_release,
266 };
267
268 static int version_read_proc(char *page, char **start, off_t off,
269                                  int count, int *eof, void *data)
270 {
271         int len;
272
273         len = snprintf(page, PAGE_SIZE, linux_proc_banner,
274                 utsname()->sysname,
275                 utsname()->release,
276                 utsname()->version);
277         return proc_calc_metrics(page, start, off, count, eof, len);
278 }
279
280 extern const struct seq_operations cpuinfo_op;
281 static int cpuinfo_open(struct inode *inode, struct file *file)
282 {
283         return seq_open(file, &cpuinfo_op);
284 }
285
286 static const struct file_operations proc_cpuinfo_operations = {
287         .open           = cpuinfo_open,
288         .read           = seq_read,
289         .llseek         = seq_lseek,
290         .release        = seq_release,
291 };
292
293 static int devinfo_show(struct seq_file *f, void *v)
294 {
295         int i = *(loff_t *) v;
296
297         if (i < CHRDEV_MAJOR_HASH_SIZE) {
298                 if (i == 0)
299                         seq_printf(f, "Character devices:\n");
300                 chrdev_show(f, i);
301         }
302 #ifdef CONFIG_BLOCK
303         else {
304                 i -= CHRDEV_MAJOR_HASH_SIZE;
305                 if (i == 0)
306                         seq_printf(f, "\nBlock devices:\n");
307                 blkdev_show(f, i);
308         }
309 #endif
310         return 0;
311 }
312
313 static void *devinfo_start(struct seq_file *f, loff_t *pos)
314 {
315         if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
316                 return pos;
317         return NULL;
318 }
319
320 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
321 {
322         (*pos)++;
323         if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
324                 return NULL;
325         return pos;
326 }
327
328 static void devinfo_stop(struct seq_file *f, void *v)
329 {
330         /* Nothing to do */
331 }
332
333 static const struct seq_operations devinfo_ops = {
334         .start = devinfo_start,
335         .next  = devinfo_next,
336         .stop  = devinfo_stop,
337         .show  = devinfo_show
338 };
339
340 static int devinfo_open(struct inode *inode, struct file *filp)
341 {
342         return seq_open(filp, &devinfo_ops);
343 }
344
345 static const struct file_operations proc_devinfo_operations = {
346         .open           = devinfo_open,
347         .read           = seq_read,
348         .llseek         = seq_lseek,
349         .release        = seq_release,
350 };
351
352 extern const struct seq_operations vmstat_op;
353 static int vmstat_open(struct inode *inode, struct file *file)
354 {
355         return seq_open(file, &vmstat_op);
356 }
357 static const struct file_operations proc_vmstat_file_operations = {
358         .open           = vmstat_open,
359         .read           = seq_read,
360         .llseek         = seq_lseek,
361         .release        = seq_release,
362 };
363
364 #ifdef CONFIG_PROC_HARDWARE
365 static int hardware_read_proc(char *page, char **start, off_t off,
366                                  int count, int *eof, void *data)
367 {
368         int len = get_hardware_list(page);
369         return proc_calc_metrics(page, start, off, count, eof, len);
370 }
371 #endif
372
373 #ifdef CONFIG_STRAM_PROC
374 static int stram_read_proc(char *page, char **start, off_t off,
375                                  int count, int *eof, void *data)
376 {
377         int len = get_stram_list(page);
378         return proc_calc_metrics(page, start, off, count, eof, len);
379 }
380 #endif
381
382 #ifdef CONFIG_BLOCK
383 static int partitions_open(struct inode *inode, struct file *file)
384 {
385         return seq_open(file, &partitions_op);
386 }
387 static const struct file_operations proc_partitions_operations = {
388         .open           = partitions_open,
389         .read           = seq_read,
390         .llseek         = seq_lseek,
391         .release        = seq_release,
392 };
393
394 static int diskstats_open(struct inode *inode, struct file *file)
395 {
396         return seq_open(file, &diskstats_op);
397 }
398 static const struct file_operations proc_diskstats_operations = {
399         .open           = diskstats_open,
400         .read           = seq_read,
401         .llseek         = seq_lseek,
402         .release        = seq_release,
403 };
404 #endif
405
406 #ifdef CONFIG_MODULES
407 extern const struct seq_operations modules_op;
408 static int modules_open(struct inode *inode, struct file *file)
409 {
410         return seq_open(file, &modules_op);
411 }
412 static const struct file_operations proc_modules_operations = {
413         .open           = modules_open,
414         .read           = seq_read,
415         .llseek         = seq_lseek,
416         .release        = seq_release,
417 };
418 #endif
419
420 #ifdef CONFIG_SLABINFO
421 static int slabinfo_open(struct inode *inode, struct file *file)
422 {
423         return seq_open(file, &slabinfo_op);
424 }
425 static const struct file_operations proc_slabinfo_operations = {
426         .open           = slabinfo_open,
427         .read           = seq_read,
428         .write          = slabinfo_write,
429         .llseek         = seq_lseek,
430         .release        = seq_release,
431 };
432
433 #ifdef CONFIG_DEBUG_SLAB_LEAK
434 extern const struct seq_operations slabstats_op;
435 static int slabstats_open(struct inode *inode, struct file *file)
436 {
437         unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
438         int ret = -ENOMEM;
439         if (n) {
440                 ret = seq_open(file, &slabstats_op);
441                 if (!ret) {
442                         struct seq_file *m = file->private_data;
443                         *n = PAGE_SIZE / (2 * sizeof(unsigned long));
444                         m->private = n;
445                         n = NULL;
446                 }
447                 kfree(n);
448         }
449         return ret;
450 }
451
452 static const struct file_operations proc_slabstats_operations = {
453         .open           = slabstats_open,
454         .read           = seq_read,
455         .llseek         = seq_lseek,
456         .release        = seq_release_private,
457 };
458 #endif
459 #endif
460
461 #ifdef CONFIG_MMU
462 static int vmalloc_open(struct inode *inode, struct file *file)
463 {
464         return seq_open(file, &vmalloc_op);
465 }
466
467 static const struct file_operations proc_vmalloc_operations = {
468         .open           = vmalloc_open,
469         .read           = seq_read,
470         .llseek         = seq_lseek,
471         .release        = seq_release,
472 };
473 #endif
474
475 #ifndef arch_irq_stat_cpu
476 #define arch_irq_stat_cpu(cpu) 0
477 #endif
478 #ifndef arch_irq_stat
479 #define arch_irq_stat() 0
480 #endif
481
482 static int show_stat(struct seq_file *p, void *v)
483 {
484         int i;
485         unsigned long jif;
486         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
487         cputime64_t guest;
488         u64 sum = 0;
489         struct timespec boottime;
490         unsigned int *per_irq_sum;
491
492         per_irq_sum = kzalloc(sizeof(unsigned int)*NR_IRQS, GFP_KERNEL);
493         if (!per_irq_sum)
494                 return -ENOMEM;
495
496         user = nice = system = idle = iowait =
497                 irq = softirq = steal = cputime64_zero;
498         guest = cputime64_zero;
499         getboottime(&boottime);
500         jif = boottime.tv_sec;
501
502         for_each_possible_cpu(i) {
503                 int j;
504
505                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
506                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
507                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
508                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
509                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
510                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
511                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
512                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
513                 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
514                 for (j = 0; j < NR_IRQS; j++) {
515                         unsigned int temp = kstat_cpu(i).irqs[j];
516                         sum += temp;
517                         per_irq_sum[j] += temp;
518                 }
519                 sum += arch_irq_stat_cpu(i);
520         }
521         sum += arch_irq_stat();
522
523         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
524                 (unsigned long long)cputime64_to_clock_t(user),
525                 (unsigned long long)cputime64_to_clock_t(nice),
526                 (unsigned long long)cputime64_to_clock_t(system),
527                 (unsigned long long)cputime64_to_clock_t(idle),
528                 (unsigned long long)cputime64_to_clock_t(iowait),
529                 (unsigned long long)cputime64_to_clock_t(irq),
530                 (unsigned long long)cputime64_to_clock_t(softirq),
531                 (unsigned long long)cputime64_to_clock_t(steal),
532                 (unsigned long long)cputime64_to_clock_t(guest));
533         for_each_online_cpu(i) {
534
535                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
536                 user = kstat_cpu(i).cpustat.user;
537                 nice = kstat_cpu(i).cpustat.nice;
538                 system = kstat_cpu(i).cpustat.system;
539                 idle = kstat_cpu(i).cpustat.idle;
540                 iowait = kstat_cpu(i).cpustat.iowait;
541                 irq = kstat_cpu(i).cpustat.irq;
542                 softirq = kstat_cpu(i).cpustat.softirq;
543                 steal = kstat_cpu(i).cpustat.steal;
544                 guest = kstat_cpu(i).cpustat.guest;
545                 seq_printf(p,
546                         "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
547                         i,
548                         (unsigned long long)cputime64_to_clock_t(user),
549                         (unsigned long long)cputime64_to_clock_t(nice),
550                         (unsigned long long)cputime64_to_clock_t(system),
551                         (unsigned long long)cputime64_to_clock_t(idle),
552                         (unsigned long long)cputime64_to_clock_t(iowait),
553                         (unsigned long long)cputime64_to_clock_t(irq),
554                         (unsigned long long)cputime64_to_clock_t(softirq),
555                         (unsigned long long)cputime64_to_clock_t(steal),
556                         (unsigned long long)cputime64_to_clock_t(guest));
557         }
558         seq_printf(p, "intr %llu", (unsigned long long)sum);
559
560         for (i = 0; i < NR_IRQS; i++)
561                 seq_printf(p, " %u", per_irq_sum[i]);
562
563         seq_printf(p,
564                 "\nctxt %llu\n"
565                 "btime %lu\n"
566                 "processes %lu\n"
567                 "procs_running %lu\n"
568                 "procs_blocked %lu\n",
569                 nr_context_switches(),
570                 (unsigned long)jif,
571                 total_forks,
572                 nr_running(),
573                 nr_iowait());
574
575         kfree(per_irq_sum);
576         return 0;
577 }
578
579 static int stat_open(struct inode *inode, struct file *file)
580 {
581         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
582         char *buf;
583         struct seq_file *m;
584         int res;
585
586         /* don't ask for more than the kmalloc() max size, currently 128 KB */
587         if (size > 128 * 1024)
588                 size = 128 * 1024;
589         buf = kmalloc(size, GFP_KERNEL);
590         if (!buf)
591                 return -ENOMEM;
592
593         res = single_open(file, show_stat, NULL);
594         if (!res) {
595                 m = file->private_data;
596                 m->buf = buf;
597                 m->size = size;
598         } else
599                 kfree(buf);
600         return res;
601 }
602 static const struct file_operations proc_stat_operations = {
603         .open           = stat_open,
604         .read           = seq_read,
605         .llseek         = seq_lseek,
606         .release        = single_release,
607 };
608
609 /*
610  * /proc/interrupts
611  */
612 static void *int_seq_start(struct seq_file *f, loff_t *pos)
613 {
614         return (*pos <= NR_IRQS) ? pos : NULL;
615 }
616
617 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
618 {
619         (*pos)++;
620         if (*pos > NR_IRQS)
621                 return NULL;
622         return pos;
623 }
624
625 static void int_seq_stop(struct seq_file *f, void *v)
626 {
627         /* Nothing to do */
628 }
629
630
631 static const struct seq_operations int_seq_ops = {
632         .start = int_seq_start,
633         .next  = int_seq_next,
634         .stop  = int_seq_stop,
635         .show  = show_interrupts
636 };
637
638 static int interrupts_open(struct inode *inode, struct file *filp)
639 {
640         return seq_open(filp, &int_seq_ops);
641 }
642
643 static const struct file_operations proc_interrupts_operations = {
644         .open           = interrupts_open,
645         .read           = seq_read,
646         .llseek         = seq_lseek,
647         .release        = seq_release,
648 };
649
650 static int filesystems_read_proc(char *page, char **start, off_t off,
651                                  int count, int *eof, void *data)
652 {
653         int len = get_filesystem_list(page);
654         return proc_calc_metrics(page, start, off, count, eof, len);
655 }
656
657 static int cmdline_read_proc(char *page, char **start, off_t off,
658                                  int count, int *eof, void *data)
659 {
660         int len;
661
662         len = sprintf(page, "%s\n", saved_command_line);
663         return proc_calc_metrics(page, start, off, count, eof, len);
664 }
665
666 static int locks_open(struct inode *inode, struct file *filp)
667 {
668         return seq_open(filp, &locks_seq_operations);
669 }
670
671 static const struct file_operations proc_locks_operations = {
672         .open           = locks_open,
673         .read           = seq_read,
674         .llseek         = seq_lseek,
675         .release        = seq_release,
676 };
677
678 static int execdomains_read_proc(char *page, char **start, off_t off,
679                                  int count, int *eof, void *data)
680 {
681         int len = get_exec_domain_list(page);
682         return proc_calc_metrics(page, start, off, count, eof, len);
683 }
684
685 #ifdef CONFIG_MAGIC_SYSRQ
686 /*
687  * writing 'C' to /proc/sysrq-trigger is like sysrq-C
688  */
689 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
690                                    size_t count, loff_t *ppos)
691 {
692         if (count) {
693                 char c;
694
695                 if (get_user(c, buf))
696                         return -EFAULT;
697                 __handle_sysrq(c, NULL, 0);
698         }
699         return count;
700 }
701
702 static const struct file_operations proc_sysrq_trigger_operations = {
703         .write          = write_sysrq_trigger,
704 };
705 #endif
706
707 #ifdef CONFIG_PROC_PAGE_MONITOR
708 #define KPMSIZE sizeof(u64)
709 #define KPMMASK (KPMSIZE - 1)
710 /* /proc/kpagecount - an array exposing page counts
711  *
712  * Each entry is a u64 representing the corresponding
713  * physical page count.
714  */
715 static ssize_t kpagecount_read(struct file *file, char __user *buf,
716                              size_t count, loff_t *ppos)
717 {
718         u64 __user *out = (u64 __user *)buf;
719         struct page *ppage;
720         unsigned long src = *ppos;
721         unsigned long pfn;
722         ssize_t ret = 0;
723         u64 pcount;
724
725         pfn = src / KPMSIZE;
726         count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
727         if (src & KPMMASK || count & KPMMASK)
728                 return -EIO;
729
730         while (count > 0) {
731                 ppage = NULL;
732                 if (pfn_valid(pfn))
733                         ppage = pfn_to_page(pfn);
734                 pfn++;
735                 if (!ppage)
736                         pcount = 0;
737                 else
738                         pcount = atomic_read(&ppage->_count);
739
740                 if (put_user(pcount, out++)) {
741                         ret = -EFAULT;
742                         break;
743                 }
744
745                 count -= KPMSIZE;
746         }
747
748         *ppos += (char __user *)out - buf;
749         if (!ret)
750                 ret = (char __user *)out - buf;
751         return ret;
752 }
753
754 static struct file_operations proc_kpagecount_operations = {
755         .llseek = mem_lseek,
756         .read = kpagecount_read,
757 };
758
759 /* /proc/kpageflags - an array exposing page flags
760  *
761  * Each entry is a u64 representing the corresponding
762  * physical page flags.
763  */
764
765 /* These macros are used to decouple internal flags from exported ones */
766
767 #define KPF_LOCKED     0
768 #define KPF_ERROR      1
769 #define KPF_REFERENCED 2
770 #define KPF_UPTODATE   3
771 #define KPF_DIRTY      4
772 #define KPF_LRU        5
773 #define KPF_ACTIVE     6
774 #define KPF_SLAB       7
775 #define KPF_WRITEBACK  8
776 #define KPF_RECLAIM    9
777 #define KPF_BUDDY     10
778
779 #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
780
781 static ssize_t kpageflags_read(struct file *file, char __user *buf,
782                              size_t count, loff_t *ppos)
783 {
784         u64 __user *out = (u64 __user *)buf;
785         struct page *ppage;
786         unsigned long src = *ppos;
787         unsigned long pfn;
788         ssize_t ret = 0;
789         u64 kflags, uflags;
790
791         pfn = src / KPMSIZE;
792         count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
793         if (src & KPMMASK || count & KPMMASK)
794                 return -EIO;
795
796         while (count > 0) {
797                 ppage = NULL;
798                 if (pfn_valid(pfn))
799                         ppage = pfn_to_page(pfn);
800                 pfn++;
801                 if (!ppage)
802                         kflags = 0;
803                 else
804                         kflags = ppage->flags;
805
806                 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
807                         kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
808                         kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
809                         kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
810                         kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
811                         kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
812                         kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
813                         kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
814                         kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
815                         kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
816                         kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
817
818                 if (put_user(uflags, out++)) {
819                         ret = -EFAULT;
820                         break;
821                 }
822
823                 count -= KPMSIZE;
824         }
825
826         *ppos += (char __user *)out - buf;
827         if (!ret)
828                 ret = (char __user *)out - buf;
829         return ret;
830 }
831
832 static struct file_operations proc_kpageflags_operations = {
833         .llseek = mem_lseek,
834         .read = kpageflags_read,
835 };
836 #endif /* CONFIG_PROC_PAGE_MONITOR */
837
838 struct proc_dir_entry *proc_root_kcore;
839
840 void __init proc_misc_init(void)
841 {
842         static struct {
843                 char *name;
844                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
845         } *p, simple_ones[] = {
846                 {"loadavg",     loadavg_read_proc},
847                 {"uptime",      uptime_read_proc},
848                 {"meminfo",     meminfo_read_proc},
849                 {"version",     version_read_proc},
850 #ifdef CONFIG_PROC_HARDWARE
851                 {"hardware",    hardware_read_proc},
852 #endif
853 #ifdef CONFIG_STRAM_PROC
854                 {"stram",       stram_read_proc},
855 #endif
856                 {"filesystems", filesystems_read_proc},
857                 {"cmdline",     cmdline_read_proc},
858                 {"execdomains", execdomains_read_proc},
859                 {NULL,}
860         };
861         for (p = simple_ones; p->name; p++)
862                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
863
864         proc_symlink("mounts", NULL, "self/mounts");
865
866         /* And now for trickier ones */
867 #ifdef CONFIG_PRINTK
868         proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
869 #endif
870         proc_create("locks", 0, NULL, &proc_locks_operations);
871         proc_create("devices", 0, NULL, &proc_devinfo_operations);
872         proc_create("cpuinfo", 0, NULL, &proc_cpuinfo_operations);
873 #ifdef CONFIG_BLOCK
874         proc_create("partitions", 0, NULL, &proc_partitions_operations);
875 #endif
876         proc_create("stat", 0, NULL, &proc_stat_operations);
877         proc_create("interrupts", 0, NULL, &proc_interrupts_operations);
878 #ifdef CONFIG_SLABINFO
879         proc_create("slabinfo",S_IWUSR|S_IRUGO,NULL,&proc_slabinfo_operations);
880 #ifdef CONFIG_DEBUG_SLAB_LEAK
881         proc_create("slab_allocators", 0, NULL, &proc_slabstats_operations);
882 #endif
883 #endif
884 #ifdef CONFIG_MMU
885         proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
886 #endif
887         proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
888         proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
889         proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
890         proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
891 #ifdef CONFIG_BLOCK
892         proc_create("diskstats", 0, NULL, &proc_diskstats_operations);
893 #endif
894 #ifdef CONFIG_MODULES
895         proc_create("modules", 0, NULL, &proc_modules_operations);
896 #endif
897 #ifdef CONFIG_SCHEDSTATS
898         proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
899 #endif
900 #ifdef CONFIG_PROC_KCORE
901         proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
902         if (proc_root_kcore)
903                 proc_root_kcore->size =
904                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
905 #endif
906 #ifdef CONFIG_PROC_PAGE_MONITOR
907         proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
908         proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
909 #endif
910 #ifdef CONFIG_PROC_VMCORE
911         proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
912 #endif
913 #ifdef CONFIG_MAGIC_SYSRQ
914         proc_create("sysrq-trigger", S_IWUSR, NULL, &proc_sysrq_trigger_operations);
915 #endif
916 }