Linux-2.6.12-rc2
[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 <asm/uaccess.h>
48 #include <asm/pgtable.h>
49 #include <asm/io.h>
50 #include <asm/tlb.h>
51 #include <asm/div64.h>
52 #include "internal.h"
53
54 #define LOAD_INT(x) ((x) >> FSHIFT)
55 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
56 /*
57  * Warning: stuff below (imported functions) assumes that its output will fit
58  * into one page. For some of those functions it may be wrong. Moreover, we
59  * have a way to deal with that gracefully. Right now I used straightforward
60  * wrappers, but this needs further analysis wrt potential overflows.
61  */
62 extern int get_hardware_list(char *);
63 extern int get_stram_list(char *);
64 extern int get_chrdev_list(char *);
65 extern int get_filesystem_list(char *);
66 extern int get_exec_domain_list(char *);
67 extern int get_dma_list(char *);
68 extern int get_locks_status (char *, char **, off_t, int);
69
70 static int proc_calc_metrics(char *page, char **start, off_t off,
71                                  int count, int *eof, int len)
72 {
73         if (len <= off+count) *eof = 1;
74         *start = page + off;
75         len -= off;
76         if (len>count) len = count;
77         if (len<0) len = 0;
78         return len;
79 }
80
81 static int loadavg_read_proc(char *page, char **start, off_t off,
82                                  int count, int *eof, void *data)
83 {
84         int a, b, c;
85         int len;
86
87         a = avenrun[0] + (FIXED_1/200);
88         b = avenrun[1] + (FIXED_1/200);
89         c = avenrun[2] + (FIXED_1/200);
90         len = sprintf(page,"%d.%02d %d.%02d %d.%02d %ld/%d %d\n",
91                 LOAD_INT(a), LOAD_FRAC(a),
92                 LOAD_INT(b), LOAD_FRAC(b),
93                 LOAD_INT(c), LOAD_FRAC(c),
94                 nr_running(), nr_threads, last_pid);
95         return proc_calc_metrics(page, start, off, count, eof, len);
96 }
97
98 static int uptime_read_proc(char *page, char **start, off_t off,
99                                  int count, int *eof, void *data)
100 {
101         struct timespec uptime;
102         struct timespec idle;
103         int len;
104         cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
105
106         do_posix_clock_monotonic_gettime(&uptime);
107         cputime_to_timespec(idletime, &idle);
108         len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
109                         (unsigned long) uptime.tv_sec,
110                         (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
111                         (unsigned long) idle.tv_sec,
112                         (idle.tv_nsec / (NSEC_PER_SEC / 100)));
113
114         return proc_calc_metrics(page, start, off, count, eof, len);
115 }
116
117 static int meminfo_read_proc(char *page, char **start, off_t off,
118                                  int count, int *eof, void *data)
119 {
120         struct sysinfo i;
121         int len;
122         struct page_state ps;
123         unsigned long inactive;
124         unsigned long active;
125         unsigned long free;
126         unsigned long committed;
127         unsigned long allowed;
128         struct vmalloc_info vmi;
129
130         get_page_state(&ps);
131         get_zone_counts(&active, &inactive, &free);
132
133 /*
134  * display in kilobytes.
135  */
136 #define K(x) ((x) << (PAGE_SHIFT - 10))
137         si_meminfo(&i);
138         si_swapinfo(&i);
139         committed = atomic_read(&vm_committed_space);
140         allowed = ((totalram_pages - hugetlb_total_pages())
141                 * sysctl_overcommit_ratio / 100) + total_swap_pages;
142
143         get_vmalloc_info(&vmi);
144
145         /*
146          * Tagged format, for easy grepping and expansion.
147          */
148         len = sprintf(page,
149                 "MemTotal:     %8lu kB\n"
150                 "MemFree:      %8lu kB\n"
151                 "Buffers:      %8lu kB\n"
152                 "Cached:       %8lu kB\n"
153                 "SwapCached:   %8lu kB\n"
154                 "Active:       %8lu kB\n"
155                 "Inactive:     %8lu kB\n"
156                 "HighTotal:    %8lu kB\n"
157                 "HighFree:     %8lu kB\n"
158                 "LowTotal:     %8lu kB\n"
159                 "LowFree:      %8lu kB\n"
160                 "SwapTotal:    %8lu kB\n"
161                 "SwapFree:     %8lu kB\n"
162                 "Dirty:        %8lu kB\n"
163                 "Writeback:    %8lu kB\n"
164                 "Mapped:       %8lu kB\n"
165                 "Slab:         %8lu kB\n"
166                 "CommitLimit:  %8lu kB\n"
167                 "Committed_AS: %8lu kB\n"
168                 "PageTables:   %8lu kB\n"
169                 "VmallocTotal: %8lu kB\n"
170                 "VmallocUsed:  %8lu kB\n"
171                 "VmallocChunk: %8lu kB\n",
172                 K(i.totalram),
173                 K(i.freeram),
174                 K(i.bufferram),
175                 K(get_page_cache_size()-total_swapcache_pages-i.bufferram),
176                 K(total_swapcache_pages),
177                 K(active),
178                 K(inactive),
179                 K(i.totalhigh),
180                 K(i.freehigh),
181                 K(i.totalram-i.totalhigh),
182                 K(i.freeram-i.freehigh),
183                 K(i.totalswap),
184                 K(i.freeswap),
185                 K(ps.nr_dirty),
186                 K(ps.nr_writeback),
187                 K(ps.nr_mapped),
188                 K(ps.nr_slab),
189                 K(allowed),
190                 K(committed),
191                 K(ps.nr_page_table_pages),
192                 (unsigned long)VMALLOC_TOTAL >> 10,
193                 vmi.used >> 10,
194                 vmi.largest_chunk >> 10
195                 );
196
197                 len += hugetlb_report_meminfo(page + len);
198
199         return proc_calc_metrics(page, start, off, count, eof, len);
200 #undef K
201 }
202
203 extern struct seq_operations fragmentation_op;
204 static int fragmentation_open(struct inode *inode, struct file *file)
205 {
206         (void)inode;
207         return seq_open(file, &fragmentation_op);
208 }
209
210 static struct file_operations fragmentation_file_operations = {
211         .open           = fragmentation_open,
212         .read           = seq_read,
213         .llseek         = seq_lseek,
214         .release        = seq_release,
215 };
216
217 static int version_read_proc(char *page, char **start, off_t off,
218                                  int count, int *eof, void *data)
219 {
220         int len;
221
222         strcpy(page, linux_banner);
223         len = strlen(page);
224         return proc_calc_metrics(page, start, off, count, eof, len);
225 }
226
227 extern struct seq_operations cpuinfo_op;
228 static int cpuinfo_open(struct inode *inode, struct file *file)
229 {
230         return seq_open(file, &cpuinfo_op);
231 }
232 static struct file_operations proc_cpuinfo_operations = {
233         .open           = cpuinfo_open,
234         .read           = seq_read,
235         .llseek         = seq_lseek,
236         .release        = seq_release,
237 };
238
239 extern struct seq_operations vmstat_op;
240 static int vmstat_open(struct inode *inode, struct file *file)
241 {
242         return seq_open(file, &vmstat_op);
243 }
244 static struct file_operations proc_vmstat_file_operations = {
245         .open           = vmstat_open,
246         .read           = seq_read,
247         .llseek         = seq_lseek,
248         .release        = seq_release,
249 };
250
251 #ifdef CONFIG_PROC_HARDWARE
252 static int hardware_read_proc(char *page, char **start, off_t off,
253                                  int count, int *eof, void *data)
254 {
255         int len = get_hardware_list(page);
256         return proc_calc_metrics(page, start, off, count, eof, len);
257 }
258 #endif
259
260 #ifdef CONFIG_STRAM_PROC
261 static int stram_read_proc(char *page, char **start, off_t off,
262                                  int count, int *eof, void *data)
263 {
264         int len = get_stram_list(page);
265         return proc_calc_metrics(page, start, off, count, eof, len);
266 }
267 #endif
268
269 extern struct seq_operations partitions_op;
270 static int partitions_open(struct inode *inode, struct file *file)
271 {
272         return seq_open(file, &partitions_op);
273 }
274 static struct file_operations proc_partitions_operations = {
275         .open           = partitions_open,
276         .read           = seq_read,
277         .llseek         = seq_lseek,
278         .release        = seq_release,
279 };
280
281 extern struct seq_operations diskstats_op;
282 static int diskstats_open(struct inode *inode, struct file *file)
283 {
284         return seq_open(file, &diskstats_op);
285 }
286 static struct file_operations proc_diskstats_operations = {
287         .open           = diskstats_open,
288         .read           = seq_read,
289         .llseek         = seq_lseek,
290         .release        = seq_release,
291 };
292
293 #ifdef CONFIG_MODULES
294 extern struct seq_operations modules_op;
295 static int modules_open(struct inode *inode, struct file *file)
296 {
297         return seq_open(file, &modules_op);
298 }
299 static struct file_operations proc_modules_operations = {
300         .open           = modules_open,
301         .read           = seq_read,
302         .llseek         = seq_lseek,
303         .release        = seq_release,
304 };
305 #endif
306
307 extern struct seq_operations slabinfo_op;
308 extern ssize_t slabinfo_write(struct file *, const char __user *, size_t, loff_t *);
309 static int slabinfo_open(struct inode *inode, struct file *file)
310 {
311         return seq_open(file, &slabinfo_op);
312 }
313 static struct file_operations proc_slabinfo_operations = {
314         .open           = slabinfo_open,
315         .read           = seq_read,
316         .write          = slabinfo_write,
317         .llseek         = seq_lseek,
318         .release        = seq_release,
319 };
320
321 static int show_stat(struct seq_file *p, void *v)
322 {
323         int i;
324         unsigned long jif;
325         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
326         u64 sum = 0;
327
328         user = nice = system = idle = iowait =
329                 irq = softirq = steal = cputime64_zero;
330         jif = - wall_to_monotonic.tv_sec;
331         if (wall_to_monotonic.tv_nsec)
332                 --jif;
333
334         for_each_cpu(i) {
335                 int j;
336
337                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
338                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
339                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
340                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
341                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
342                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
343                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
344                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
345                 for (j = 0 ; j < NR_IRQS ; j++)
346                         sum += kstat_cpu(i).irqs[j];
347         }
348
349         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu\n",
350                 (unsigned long long)cputime64_to_clock_t(user),
351                 (unsigned long long)cputime64_to_clock_t(nice),
352                 (unsigned long long)cputime64_to_clock_t(system),
353                 (unsigned long long)cputime64_to_clock_t(idle),
354                 (unsigned long long)cputime64_to_clock_t(iowait),
355                 (unsigned long long)cputime64_to_clock_t(irq),
356                 (unsigned long long)cputime64_to_clock_t(softirq),
357                 (unsigned long long)cputime64_to_clock_t(steal));
358         for_each_online_cpu(i) {
359
360                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
361                 user = kstat_cpu(i).cpustat.user;
362                 nice = kstat_cpu(i).cpustat.nice;
363                 system = kstat_cpu(i).cpustat.system;
364                 idle = kstat_cpu(i).cpustat.idle;
365                 iowait = kstat_cpu(i).cpustat.iowait;
366                 irq = kstat_cpu(i).cpustat.irq;
367                 softirq = kstat_cpu(i).cpustat.softirq;
368                 steal = kstat_cpu(i).cpustat.steal;
369                 seq_printf(p, "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu\n",
370                         i,
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         }
380         seq_printf(p, "intr %llu", (unsigned long long)sum);
381
382 #if !defined(CONFIG_PPC64) && !defined(CONFIG_ALPHA)
383         for (i = 0; i < NR_IRQS; i++)
384                 seq_printf(p, " %u", kstat_irqs(i));
385 #endif
386
387         seq_printf(p,
388                 "\nctxt %llu\n"
389                 "btime %lu\n"
390                 "processes %lu\n"
391                 "procs_running %lu\n"
392                 "procs_blocked %lu\n",
393                 nr_context_switches(),
394                 (unsigned long)jif,
395                 total_forks,
396                 nr_running(),
397                 nr_iowait());
398
399         return 0;
400 }
401
402 static int stat_open(struct inode *inode, struct file *file)
403 {
404         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
405         char *buf;
406         struct seq_file *m;
407         int res;
408
409         /* don't ask for more than the kmalloc() max size, currently 128 KB */
410         if (size > 128 * 1024)
411                 size = 128 * 1024;
412         buf = kmalloc(size, GFP_KERNEL);
413         if (!buf)
414                 return -ENOMEM;
415
416         res = single_open(file, show_stat, NULL);
417         if (!res) {
418                 m = file->private_data;
419                 m->buf = buf;
420                 m->size = size;
421         } else
422                 kfree(buf);
423         return res;
424 }
425 static struct file_operations proc_stat_operations = {
426         .open           = stat_open,
427         .read           = seq_read,
428         .llseek         = seq_lseek,
429         .release        = single_release,
430 };
431
432 static int devices_read_proc(char *page, char **start, off_t off,
433                                  int count, int *eof, void *data)
434 {
435         int len = get_chrdev_list(page);
436         len += get_blkdev_list(page+len);
437         return proc_calc_metrics(page, start, off, count, eof, len);
438 }
439
440 /*
441  * /proc/interrupts
442  */
443 static void *int_seq_start(struct seq_file *f, loff_t *pos)
444 {
445         return (*pos <= NR_IRQS) ? pos : NULL;
446 }
447
448 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
449 {
450         (*pos)++;
451         if (*pos > NR_IRQS)
452                 return NULL;
453         return pos;
454 }
455
456 static void int_seq_stop(struct seq_file *f, void *v)
457 {
458         /* Nothing to do */
459 }
460
461
462 extern int show_interrupts(struct seq_file *f, void *v); /* In arch code */
463 static struct seq_operations int_seq_ops = {
464         .start = int_seq_start,
465         .next  = int_seq_next,
466         .stop  = int_seq_stop,
467         .show  = show_interrupts
468 };
469
470 static int interrupts_open(struct inode *inode, struct file *filp)
471 {
472         return seq_open(filp, &int_seq_ops);
473 }
474
475 static struct file_operations proc_interrupts_operations = {
476         .open           = interrupts_open,
477         .read           = seq_read,
478         .llseek         = seq_lseek,
479         .release        = seq_release,
480 };
481
482 static int filesystems_read_proc(char *page, char **start, off_t off,
483                                  int count, int *eof, void *data)
484 {
485         int len = get_filesystem_list(page);
486         return proc_calc_metrics(page, start, off, count, eof, len);
487 }
488
489 static int cmdline_read_proc(char *page, char **start, off_t off,
490                                  int count, int *eof, void *data)
491 {
492         int len;
493
494         len = sprintf(page, "%s\n", saved_command_line);
495         return proc_calc_metrics(page, start, off, count, eof, len);
496 }
497
498 static int locks_read_proc(char *page, char **start, off_t off,
499                                  int count, int *eof, void *data)
500 {
501         int len = get_locks_status(page, start, off, count);
502
503         if (len < count)
504                 *eof = 1;
505         return len;
506 }
507
508 static int execdomains_read_proc(char *page, char **start, off_t off,
509                                  int count, int *eof, void *data)
510 {
511         int len = get_exec_domain_list(page);
512         return proc_calc_metrics(page, start, off, count, eof, len);
513 }
514
515 #ifdef CONFIG_MAGIC_SYSRQ
516 /*
517  * writing 'C' to /proc/sysrq-trigger is like sysrq-C
518  */
519 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
520                                    size_t count, loff_t *ppos)
521 {
522         if (count) {
523                 char c;
524
525                 if (get_user(c, buf))
526                         return -EFAULT;
527                 __handle_sysrq(c, NULL, NULL, 0);
528         }
529         return count;
530 }
531
532 static struct file_operations proc_sysrq_trigger_operations = {
533         .write          = write_sysrq_trigger,
534 };
535 #endif
536
537 struct proc_dir_entry *proc_root_kcore;
538
539 void create_seq_entry(char *name, mode_t mode, struct file_operations *f)
540 {
541         struct proc_dir_entry *entry;
542         entry = create_proc_entry(name, mode, NULL);
543         if (entry)
544                 entry->proc_fops = f;
545 }
546
547 void __init proc_misc_init(void)
548 {
549         struct proc_dir_entry *entry;
550         static struct {
551                 char *name;
552                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
553         } *p, simple_ones[] = {
554                 {"loadavg",     loadavg_read_proc},
555                 {"uptime",      uptime_read_proc},
556                 {"meminfo",     meminfo_read_proc},
557                 {"version",     version_read_proc},
558 #ifdef CONFIG_PROC_HARDWARE
559                 {"hardware",    hardware_read_proc},
560 #endif
561 #ifdef CONFIG_STRAM_PROC
562                 {"stram",       stram_read_proc},
563 #endif
564                 {"devices",     devices_read_proc},
565                 {"filesystems", filesystems_read_proc},
566                 {"cmdline",     cmdline_read_proc},
567                 {"locks",       locks_read_proc},
568                 {"execdomains", execdomains_read_proc},
569                 {NULL,}
570         };
571         for (p = simple_ones; p->name; p++)
572                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
573
574         proc_symlink("mounts", NULL, "self/mounts");
575
576         /* And now for trickier ones */
577         entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
578         if (entry)
579                 entry->proc_fops = &proc_kmsg_operations;
580         create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
581         create_seq_entry("partitions", 0, &proc_partitions_operations);
582         create_seq_entry("stat", 0, &proc_stat_operations);
583         create_seq_entry("interrupts", 0, &proc_interrupts_operations);
584         create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
585         create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
586         create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
587         create_seq_entry("diskstats", 0, &proc_diskstats_operations);
588 #ifdef CONFIG_MODULES
589         create_seq_entry("modules", 0, &proc_modules_operations);
590 #endif
591 #ifdef CONFIG_SCHEDSTATS
592         create_seq_entry("schedstat", 0, &proc_schedstat_operations);
593 #endif
594 #ifdef CONFIG_PROC_KCORE
595         proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
596         if (proc_root_kcore) {
597                 proc_root_kcore->proc_fops = &proc_kcore_operations;
598                 proc_root_kcore->size =
599                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
600         }
601 #endif
602 #ifdef CONFIG_MAGIC_SYSRQ
603         entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
604         if (entry)
605                 entry->proc_fops = &proc_sysrq_trigger_operations;
606 #endif
607 #ifdef CONFIG_PPC32
608         {
609                 extern struct file_operations ppc_htab_operations;
610                 entry = create_proc_entry("ppc_htab", S_IRUGO|S_IWUSR, NULL);
611                 if (entry)
612                         entry->proc_fops = &ppc_htab_operations;
613         }
614 #endif
615 }