63bf6c00fa0ccc736a2aada6e2c93d9a1e806abe
[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/tty.h>
24 #include <linux/string.h>
25 #include <linux/mman.h>
26 #include <linux/proc_fs.h>
27 #include <linux/ioport.h>
28 #include <linux/config.h>
29 #include <linux/mm.h>
30 #include <linux/mmzone.h>
31 #include <linux/pagemap.h>
32 #include <linux/swap.h>
33 #include <linux/slab.h>
34 #include <linux/smp.h>
35 #include <linux/signal.h>
36 #include <linux/module.h>
37 #include <linux/init.h>
38 #include <linux/smp_lock.h>
39 #include <linux/seq_file.h>
40 #include <linux/times.h>
41 #include <linux/profile.h>
42 #include <linux/blkdev.h>
43 #include <linux/hugetlb.h>
44 #include <linux/jiffies.h>
45 #include <linux/sysrq.h>
46 #include <linux/vmalloc.h>
47 #include <linux/crash_dump.h>
48 #include <asm/uaccess.h>
49 #include <asm/pgtable.h>
50 #include <asm/io.h>
51 #include <asm/tlb.h>
52 #include <asm/div64.h>
53 #include "internal.h"
54
55 #define LOAD_INT(x) ((x) >> FSHIFT)
56 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
57 /*
58  * Warning: stuff below (imported functions) assumes that its output will fit
59  * into one page. For some of those functions it may be wrong. Moreover, we
60  * have a way to deal with that gracefully. Right now I used straightforward
61  * wrappers, but this needs further analysis wrt potential overflows.
62  */
63 extern int get_hardware_list(char *);
64 extern int get_stram_list(char *);
65 extern int get_chrdev_list(char *);
66 extern int get_filesystem_list(char *);
67 extern int get_exec_domain_list(char *);
68 extern int get_dma_list(char *);
69 extern int get_locks_status (char *, char **, off_t, int);
70
71 static int proc_calc_metrics(char *page, char **start, off_t off,
72                                  int count, int *eof, int len)
73 {
74         if (len <= off+count) *eof = 1;
75         *start = page + off;
76         len -= off;
77         if (len>count) len = count;
78         if (len<0) len = 0;
79         return len;
80 }
81
82 static int loadavg_read_proc(char *page, char **start, off_t off,
83                                  int count, int *eof, void *data)
84 {
85         int a, b, c;
86         int len;
87
88         a = avenrun[0] + (FIXED_1/200);
89         b = avenrun[1] + (FIXED_1/200);
90         c = avenrun[2] + (FIXED_1/200);
91         len = sprintf(page,"%d.%02d %d.%02d %d.%02d %ld/%d %d\n",
92                 LOAD_INT(a), LOAD_FRAC(a),
93                 LOAD_INT(b), LOAD_FRAC(b),
94                 LOAD_INT(c), LOAD_FRAC(c),
95                 nr_running(), nr_threads, last_pid);
96         return proc_calc_metrics(page, start, off, count, eof, len);
97 }
98
99 static int uptime_read_proc(char *page, char **start, off_t off,
100                                  int count, int *eof, void *data)
101 {
102         struct timespec uptime;
103         struct timespec idle;
104         int len;
105         cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
106
107         do_posix_clock_monotonic_gettime(&uptime);
108         cputime_to_timespec(idletime, &idle);
109         len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
110                         (unsigned long) uptime.tv_sec,
111                         (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
112                         (unsigned long) idle.tv_sec,
113                         (idle.tv_nsec / (NSEC_PER_SEC / 100)));
114
115         return proc_calc_metrics(page, start, off, count, eof, len);
116 }
117
118 static int meminfo_read_proc(char *page, char **start, off_t off,
119                                  int count, int *eof, void *data)
120 {
121         struct sysinfo i;
122         int len;
123         struct page_state ps;
124         unsigned long inactive;
125         unsigned long active;
126         unsigned long free;
127         unsigned long committed;
128         unsigned long allowed;
129         struct vmalloc_info vmi;
130         long cached;
131
132         get_page_state(&ps);
133         get_zone_counts(&active, &inactive, &free);
134
135 /*
136  * display in kilobytes.
137  */
138 #define K(x) ((x) << (PAGE_SHIFT - 10))
139         si_meminfo(&i);
140         si_swapinfo(&i);
141         committed = atomic_read(&vm_committed_space);
142         allowed = ((totalram_pages - hugetlb_total_pages())
143                 * sysctl_overcommit_ratio / 100) + total_swap_pages;
144
145         cached = get_page_cache_size() - total_swapcache_pages - i.bufferram;
146         if (cached < 0)
147                 cached = 0;
148
149         get_vmalloc_info(&vmi);
150
151         /*
152          * Tagged format, for easy grepping and expansion.
153          */
154         len = sprintf(page,
155                 "MemTotal:     %8lu kB\n"
156                 "MemFree:      %8lu kB\n"
157                 "Buffers:      %8lu kB\n"
158                 "Cached:       %8lu kB\n"
159                 "SwapCached:   %8lu kB\n"
160                 "Active:       %8lu kB\n"
161                 "Inactive:     %8lu kB\n"
162                 "HighTotal:    %8lu kB\n"
163                 "HighFree:     %8lu kB\n"
164                 "LowTotal:     %8lu kB\n"
165                 "LowFree:      %8lu kB\n"
166                 "SwapTotal:    %8lu kB\n"
167                 "SwapFree:     %8lu kB\n"
168                 "Dirty:        %8lu kB\n"
169                 "Writeback:    %8lu kB\n"
170                 "Mapped:       %8lu kB\n"
171                 "Slab:         %8lu kB\n"
172                 "CommitLimit:  %8lu kB\n"
173                 "Committed_AS: %8lu kB\n"
174                 "PageTables:   %8lu kB\n"
175                 "VmallocTotal: %8lu kB\n"
176                 "VmallocUsed:  %8lu kB\n"
177                 "VmallocChunk: %8lu kB\n",
178                 K(i.totalram),
179                 K(i.freeram),
180                 K(i.bufferram),
181                 K(cached),
182                 K(total_swapcache_pages),
183                 K(active),
184                 K(inactive),
185                 K(i.totalhigh),
186                 K(i.freehigh),
187                 K(i.totalram-i.totalhigh),
188                 K(i.freeram-i.freehigh),
189                 K(i.totalswap),
190                 K(i.freeswap),
191                 K(ps.nr_dirty),
192                 K(ps.nr_writeback),
193                 K(ps.nr_mapped),
194                 K(ps.nr_slab),
195                 K(allowed),
196                 K(committed),
197                 K(ps.nr_page_table_pages),
198                 (unsigned long)VMALLOC_TOTAL >> 10,
199                 vmi.used >> 10,
200                 vmi.largest_chunk >> 10
201                 );
202
203                 len += hugetlb_report_meminfo(page + len);
204
205         return proc_calc_metrics(page, start, off, count, eof, len);
206 #undef K
207 }
208
209 extern struct seq_operations fragmentation_op;
210 static int fragmentation_open(struct inode *inode, struct file *file)
211 {
212         (void)inode;
213         return seq_open(file, &fragmentation_op);
214 }
215
216 static struct file_operations fragmentation_file_operations = {
217         .open           = fragmentation_open,
218         .read           = seq_read,
219         .llseek         = seq_lseek,
220         .release        = seq_release,
221 };
222
223 extern struct seq_operations zoneinfo_op;
224 static int zoneinfo_open(struct inode *inode, struct file *file)
225 {
226         return seq_open(file, &zoneinfo_op);
227 }
228
229 static struct file_operations proc_zoneinfo_file_operations = {
230         .open           = zoneinfo_open,
231         .read           = seq_read,
232         .llseek         = seq_lseek,
233         .release        = seq_release,
234 };
235
236 static int version_read_proc(char *page, char **start, off_t off,
237                                  int count, int *eof, void *data)
238 {
239         int len;
240
241         strcpy(page, linux_banner);
242         len = strlen(page);
243         return proc_calc_metrics(page, start, off, count, eof, len);
244 }
245
246 extern struct seq_operations cpuinfo_op;
247 static int cpuinfo_open(struct inode *inode, struct file *file)
248 {
249         return seq_open(file, &cpuinfo_op);
250 }
251 static struct file_operations proc_cpuinfo_operations = {
252         .open           = cpuinfo_open,
253         .read           = seq_read,
254         .llseek         = seq_lseek,
255         .release        = seq_release,
256 };
257
258 extern struct seq_operations vmstat_op;
259 static int vmstat_open(struct inode *inode, struct file *file)
260 {
261         return seq_open(file, &vmstat_op);
262 }
263 static struct file_operations proc_vmstat_file_operations = {
264         .open           = vmstat_open,
265         .read           = seq_read,
266         .llseek         = seq_lseek,
267         .release        = seq_release,
268 };
269
270 #ifdef CONFIG_PROC_HARDWARE
271 static int hardware_read_proc(char *page, char **start, off_t off,
272                                  int count, int *eof, void *data)
273 {
274         int len = get_hardware_list(page);
275         return proc_calc_metrics(page, start, off, count, eof, len);
276 }
277 #endif
278
279 #ifdef CONFIG_STRAM_PROC
280 static int stram_read_proc(char *page, char **start, off_t off,
281                                  int count, int *eof, void *data)
282 {
283         int len = get_stram_list(page);
284         return proc_calc_metrics(page, start, off, count, eof, len);
285 }
286 #endif
287
288 extern struct seq_operations partitions_op;
289 static int partitions_open(struct inode *inode, struct file *file)
290 {
291         return seq_open(file, &partitions_op);
292 }
293 static struct file_operations proc_partitions_operations = {
294         .open           = partitions_open,
295         .read           = seq_read,
296         .llseek         = seq_lseek,
297         .release        = seq_release,
298 };
299
300 extern struct seq_operations diskstats_op;
301 static int diskstats_open(struct inode *inode, struct file *file)
302 {
303         return seq_open(file, &diskstats_op);
304 }
305 static struct file_operations proc_diskstats_operations = {
306         .open           = diskstats_open,
307         .read           = seq_read,
308         .llseek         = seq_lseek,
309         .release        = seq_release,
310 };
311
312 #ifdef CONFIG_MODULES
313 extern struct seq_operations modules_op;
314 static int modules_open(struct inode *inode, struct file *file)
315 {
316         return seq_open(file, &modules_op);
317 }
318 static struct file_operations proc_modules_operations = {
319         .open           = modules_open,
320         .read           = seq_read,
321         .llseek         = seq_lseek,
322         .release        = seq_release,
323 };
324 #endif
325
326 #ifdef CONFIG_SLAB
327 extern struct seq_operations slabinfo_op;
328 extern ssize_t slabinfo_write(struct file *, const char __user *, size_t, loff_t *);
329 static int slabinfo_open(struct inode *inode, struct file *file)
330 {
331         return seq_open(file, &slabinfo_op);
332 }
333 static struct file_operations proc_slabinfo_operations = {
334         .open           = slabinfo_open,
335         .read           = seq_read,
336         .write          = slabinfo_write,
337         .llseek         = seq_lseek,
338         .release        = seq_release,
339 };
340 #endif
341
342 static int show_stat(struct seq_file *p, void *v)
343 {
344         int i;
345         unsigned long jif;
346         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
347         u64 sum = 0;
348
349         user = nice = system = idle = iowait =
350                 irq = softirq = steal = cputime64_zero;
351         jif = - wall_to_monotonic.tv_sec;
352         if (wall_to_monotonic.tv_nsec)
353                 --jif;
354
355         for_each_cpu(i) {
356                 int j;
357
358                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
359                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
360                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
361                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
362                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
363                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
364                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
365                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
366                 for (j = 0 ; j < NR_IRQS ; j++)
367                         sum += kstat_cpu(i).irqs[j];
368         }
369
370         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu\n",
371                 (unsigned long long)cputime64_to_clock_t(user),
372                 (unsigned long long)cputime64_to_clock_t(nice),
373                 (unsigned long long)cputime64_to_clock_t(system),
374                 (unsigned long long)cputime64_to_clock_t(idle),
375                 (unsigned long long)cputime64_to_clock_t(iowait),
376                 (unsigned long long)cputime64_to_clock_t(irq),
377                 (unsigned long long)cputime64_to_clock_t(softirq),
378                 (unsigned long long)cputime64_to_clock_t(steal));
379         for_each_online_cpu(i) {
380
381                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
382                 user = kstat_cpu(i).cpustat.user;
383                 nice = kstat_cpu(i).cpustat.nice;
384                 system = kstat_cpu(i).cpustat.system;
385                 idle = kstat_cpu(i).cpustat.idle;
386                 iowait = kstat_cpu(i).cpustat.iowait;
387                 irq = kstat_cpu(i).cpustat.irq;
388                 softirq = kstat_cpu(i).cpustat.softirq;
389                 steal = kstat_cpu(i).cpustat.steal;
390                 seq_printf(p, "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu\n",
391                         i,
392                         (unsigned long long)cputime64_to_clock_t(user),
393                         (unsigned long long)cputime64_to_clock_t(nice),
394                         (unsigned long long)cputime64_to_clock_t(system),
395                         (unsigned long long)cputime64_to_clock_t(idle),
396                         (unsigned long long)cputime64_to_clock_t(iowait),
397                         (unsigned long long)cputime64_to_clock_t(irq),
398                         (unsigned long long)cputime64_to_clock_t(softirq),
399                         (unsigned long long)cputime64_to_clock_t(steal));
400         }
401         seq_printf(p, "intr %llu", (unsigned long long)sum);
402
403 #if !defined(CONFIG_PPC64) && !defined(CONFIG_ALPHA)
404         for (i = 0; i < NR_IRQS; i++)
405                 seq_printf(p, " %u", kstat_irqs(i));
406 #endif
407
408         seq_printf(p,
409                 "\nctxt %llu\n"
410                 "btime %lu\n"
411                 "processes %lu\n"
412                 "procs_running %lu\n"
413                 "procs_blocked %lu\n",
414                 nr_context_switches(),
415                 (unsigned long)jif,
416                 total_forks,
417                 nr_running(),
418                 nr_iowait());
419
420         return 0;
421 }
422
423 static int stat_open(struct inode *inode, struct file *file)
424 {
425         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
426         char *buf;
427         struct seq_file *m;
428         int res;
429
430         /* don't ask for more than the kmalloc() max size, currently 128 KB */
431         if (size > 128 * 1024)
432                 size = 128 * 1024;
433         buf = kmalloc(size, GFP_KERNEL);
434         if (!buf)
435                 return -ENOMEM;
436
437         res = single_open(file, show_stat, NULL);
438         if (!res) {
439                 m = file->private_data;
440                 m->buf = buf;
441                 m->size = size;
442         } else
443                 kfree(buf);
444         return res;
445 }
446 static struct file_operations proc_stat_operations = {
447         .open           = stat_open,
448         .read           = seq_read,
449         .llseek         = seq_lseek,
450         .release        = single_release,
451 };
452
453 static int devices_read_proc(char *page, char **start, off_t off,
454                                  int count, int *eof, void *data)
455 {
456         int len = get_chrdev_list(page);
457         len += get_blkdev_list(page+len, len);
458         return proc_calc_metrics(page, start, off, count, eof, len);
459 }
460
461 /*
462  * /proc/interrupts
463  */
464 static void *int_seq_start(struct seq_file *f, loff_t *pos)
465 {
466         return (*pos <= NR_IRQS) ? pos : NULL;
467 }
468
469 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
470 {
471         (*pos)++;
472         if (*pos > NR_IRQS)
473                 return NULL;
474         return pos;
475 }
476
477 static void int_seq_stop(struct seq_file *f, void *v)
478 {
479         /* Nothing to do */
480 }
481
482
483 extern int show_interrupts(struct seq_file *f, void *v); /* In arch code */
484 static struct seq_operations int_seq_ops = {
485         .start = int_seq_start,
486         .next  = int_seq_next,
487         .stop  = int_seq_stop,
488         .show  = show_interrupts
489 };
490
491 static int interrupts_open(struct inode *inode, struct file *filp)
492 {
493         return seq_open(filp, &int_seq_ops);
494 }
495
496 static struct file_operations proc_interrupts_operations = {
497         .open           = interrupts_open,
498         .read           = seq_read,
499         .llseek         = seq_lseek,
500         .release        = seq_release,
501 };
502
503 static int filesystems_read_proc(char *page, char **start, off_t off,
504                                  int count, int *eof, void *data)
505 {
506         int len = get_filesystem_list(page);
507         return proc_calc_metrics(page, start, off, count, eof, len);
508 }
509
510 static int cmdline_read_proc(char *page, char **start, off_t off,
511                                  int count, int *eof, void *data)
512 {
513         int len;
514
515         len = sprintf(page, "%s\n", saved_command_line);
516         return proc_calc_metrics(page, start, off, count, eof, len);
517 }
518
519 static int locks_read_proc(char *page, char **start, off_t off,
520                                  int count, int *eof, void *data)
521 {
522         int len = get_locks_status(page, start, off, count);
523
524         if (len < count)
525                 *eof = 1;
526         return len;
527 }
528
529 static int execdomains_read_proc(char *page, char **start, off_t off,
530                                  int count, int *eof, void *data)
531 {
532         int len = get_exec_domain_list(page);
533         return proc_calc_metrics(page, start, off, count, eof, len);
534 }
535
536 #ifdef CONFIG_MAGIC_SYSRQ
537 /*
538  * writing 'C' to /proc/sysrq-trigger is like sysrq-C
539  */
540 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
541                                    size_t count, loff_t *ppos)
542 {
543         if (count) {
544                 char c;
545
546                 if (get_user(c, buf))
547                         return -EFAULT;
548                 __handle_sysrq(c, NULL, NULL, 0);
549         }
550         return count;
551 }
552
553 static struct file_operations proc_sysrq_trigger_operations = {
554         .write          = write_sysrq_trigger,
555 };
556 #endif
557
558 struct proc_dir_entry *proc_root_kcore;
559
560 void create_seq_entry(char *name, mode_t mode, struct file_operations *f)
561 {
562         struct proc_dir_entry *entry;
563         entry = create_proc_entry(name, mode, NULL);
564         if (entry)
565                 entry->proc_fops = f;
566 }
567
568 void __init proc_misc_init(void)
569 {
570         struct proc_dir_entry *entry;
571         static struct {
572                 char *name;
573                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
574         } *p, simple_ones[] = {
575                 {"loadavg",     loadavg_read_proc},
576                 {"uptime",      uptime_read_proc},
577                 {"meminfo",     meminfo_read_proc},
578                 {"version",     version_read_proc},
579 #ifdef CONFIG_PROC_HARDWARE
580                 {"hardware",    hardware_read_proc},
581 #endif
582 #ifdef CONFIG_STRAM_PROC
583                 {"stram",       stram_read_proc},
584 #endif
585                 {"devices",     devices_read_proc},
586                 {"filesystems", filesystems_read_proc},
587                 {"cmdline",     cmdline_read_proc},
588                 {"locks",       locks_read_proc},
589                 {"execdomains", execdomains_read_proc},
590                 {NULL,}
591         };
592         for (p = simple_ones; p->name; p++)
593                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
594
595         proc_symlink("mounts", NULL, "self/mounts");
596
597         /* And now for trickier ones */
598         entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
599         if (entry)
600                 entry->proc_fops = &proc_kmsg_operations;
601         create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
602         create_seq_entry("partitions", 0, &proc_partitions_operations);
603         create_seq_entry("stat", 0, &proc_stat_operations);
604         create_seq_entry("interrupts", 0, &proc_interrupts_operations);
605 #ifdef CONFIG_SLAB
606         create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
607 #endif
608         create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
609         create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
610         create_seq_entry("zoneinfo",S_IRUGO, &proc_zoneinfo_file_operations);
611         create_seq_entry("diskstats", 0, &proc_diskstats_operations);
612 #ifdef CONFIG_MODULES
613         create_seq_entry("modules", 0, &proc_modules_operations);
614 #endif
615 #ifdef CONFIG_SCHEDSTATS
616         create_seq_entry("schedstat", 0, &proc_schedstat_operations);
617 #endif
618 #ifdef CONFIG_PROC_KCORE
619         proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
620         if (proc_root_kcore) {
621                 proc_root_kcore->proc_fops = &proc_kcore_operations;
622                 proc_root_kcore->size =
623                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
624         }
625 #endif
626 #ifdef CONFIG_PROC_VMCORE
627         proc_vmcore = create_proc_entry("vmcore", S_IRUSR, NULL);
628         if (proc_vmcore)
629                 proc_vmcore->proc_fops = &proc_vmcore_operations;
630 #endif
631 #ifdef CONFIG_MAGIC_SYSRQ
632         entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
633         if (entry)
634                 entry->proc_fops = &proc_sysrq_trigger_operations;
635 #endif
636 }