/home/lenb/linux-2.6 branch 'acpi-2.6.12'
[linux-2.6] / 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 extern struct seq_operations slabinfo_op;
327 extern ssize_t slabinfo_write(struct file *, const char __user *, size_t, loff_t *);
328 static int slabinfo_open(struct inode *inode, struct file *file)
329 {
330         return seq_open(file, &slabinfo_op);
331 }
332 static struct file_operations proc_slabinfo_operations = {
333         .open           = slabinfo_open,
334         .read           = seq_read,
335         .write          = slabinfo_write,
336         .llseek         = seq_lseek,
337         .release        = seq_release,
338 };
339
340 static int show_stat(struct seq_file *p, void *v)
341 {
342         int i;
343         unsigned long jif;
344         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
345         u64 sum = 0;
346
347         user = nice = system = idle = iowait =
348                 irq = softirq = steal = cputime64_zero;
349         jif = - wall_to_monotonic.tv_sec;
350         if (wall_to_monotonic.tv_nsec)
351                 --jif;
352
353         for_each_cpu(i) {
354                 int j;
355
356                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
357                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
358                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
359                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
360                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
361                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
362                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
363                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
364                 for (j = 0 ; j < NR_IRQS ; j++)
365                         sum += kstat_cpu(i).irqs[j];
366         }
367
368         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu\n",
369                 (unsigned long long)cputime64_to_clock_t(user),
370                 (unsigned long long)cputime64_to_clock_t(nice),
371                 (unsigned long long)cputime64_to_clock_t(system),
372                 (unsigned long long)cputime64_to_clock_t(idle),
373                 (unsigned long long)cputime64_to_clock_t(iowait),
374                 (unsigned long long)cputime64_to_clock_t(irq),
375                 (unsigned long long)cputime64_to_clock_t(softirq),
376                 (unsigned long long)cputime64_to_clock_t(steal));
377         for_each_online_cpu(i) {
378
379                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
380                 user = kstat_cpu(i).cpustat.user;
381                 nice = kstat_cpu(i).cpustat.nice;
382                 system = kstat_cpu(i).cpustat.system;
383                 idle = kstat_cpu(i).cpustat.idle;
384                 iowait = kstat_cpu(i).cpustat.iowait;
385                 irq = kstat_cpu(i).cpustat.irq;
386                 softirq = kstat_cpu(i).cpustat.softirq;
387                 steal = kstat_cpu(i).cpustat.steal;
388                 seq_printf(p, "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu\n",
389                         i,
390                         (unsigned long long)cputime64_to_clock_t(user),
391                         (unsigned long long)cputime64_to_clock_t(nice),
392                         (unsigned long long)cputime64_to_clock_t(system),
393                         (unsigned long long)cputime64_to_clock_t(idle),
394                         (unsigned long long)cputime64_to_clock_t(iowait),
395                         (unsigned long long)cputime64_to_clock_t(irq),
396                         (unsigned long long)cputime64_to_clock_t(softirq),
397                         (unsigned long long)cputime64_to_clock_t(steal));
398         }
399         seq_printf(p, "intr %llu", (unsigned long long)sum);
400
401 #if !defined(CONFIG_PPC64) && !defined(CONFIG_ALPHA)
402         for (i = 0; i < NR_IRQS; i++)
403                 seq_printf(p, " %u", kstat_irqs(i));
404 #endif
405
406         seq_printf(p,
407                 "\nctxt %llu\n"
408                 "btime %lu\n"
409                 "processes %lu\n"
410                 "procs_running %lu\n"
411                 "procs_blocked %lu\n",
412                 nr_context_switches(),
413                 (unsigned long)jif,
414                 total_forks,
415                 nr_running(),
416                 nr_iowait());
417
418         return 0;
419 }
420
421 static int stat_open(struct inode *inode, struct file *file)
422 {
423         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
424         char *buf;
425         struct seq_file *m;
426         int res;
427
428         /* don't ask for more than the kmalloc() max size, currently 128 KB */
429         if (size > 128 * 1024)
430                 size = 128 * 1024;
431         buf = kmalloc(size, GFP_KERNEL);
432         if (!buf)
433                 return -ENOMEM;
434
435         res = single_open(file, show_stat, NULL);
436         if (!res) {
437                 m = file->private_data;
438                 m->buf = buf;
439                 m->size = size;
440         } else
441                 kfree(buf);
442         return res;
443 }
444 static struct file_operations proc_stat_operations = {
445         .open           = stat_open,
446         .read           = seq_read,
447         .llseek         = seq_lseek,
448         .release        = single_release,
449 };
450
451 static int devices_read_proc(char *page, char **start, off_t off,
452                                  int count, int *eof, void *data)
453 {
454         int len = get_chrdev_list(page);
455         len += get_blkdev_list(page+len, len);
456         return proc_calc_metrics(page, start, off, count, eof, len);
457 }
458
459 /*
460  * /proc/interrupts
461  */
462 static void *int_seq_start(struct seq_file *f, loff_t *pos)
463 {
464         return (*pos <= NR_IRQS) ? pos : NULL;
465 }
466
467 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
468 {
469         (*pos)++;
470         if (*pos > NR_IRQS)
471                 return NULL;
472         return pos;
473 }
474
475 static void int_seq_stop(struct seq_file *f, void *v)
476 {
477         /* Nothing to do */
478 }
479
480
481 extern int show_interrupts(struct seq_file *f, void *v); /* In arch code */
482 static struct seq_operations int_seq_ops = {
483         .start = int_seq_start,
484         .next  = int_seq_next,
485         .stop  = int_seq_stop,
486         .show  = show_interrupts
487 };
488
489 static int interrupts_open(struct inode *inode, struct file *filp)
490 {
491         return seq_open(filp, &int_seq_ops);
492 }
493
494 static struct file_operations proc_interrupts_operations = {
495         .open           = interrupts_open,
496         .read           = seq_read,
497         .llseek         = seq_lseek,
498         .release        = seq_release,
499 };
500
501 static int filesystems_read_proc(char *page, char **start, off_t off,
502                                  int count, int *eof, void *data)
503 {
504         int len = get_filesystem_list(page);
505         return proc_calc_metrics(page, start, off, count, eof, len);
506 }
507
508 static int cmdline_read_proc(char *page, char **start, off_t off,
509                                  int count, int *eof, void *data)
510 {
511         int len;
512
513         len = sprintf(page, "%s\n", saved_command_line);
514         return proc_calc_metrics(page, start, off, count, eof, len);
515 }
516
517 static int locks_read_proc(char *page, char **start, off_t off,
518                                  int count, int *eof, void *data)
519 {
520         int len = get_locks_status(page, start, off, count);
521
522         if (len < count)
523                 *eof = 1;
524         return len;
525 }
526
527 static int execdomains_read_proc(char *page, char **start, off_t off,
528                                  int count, int *eof, void *data)
529 {
530         int len = get_exec_domain_list(page);
531         return proc_calc_metrics(page, start, off, count, eof, len);
532 }
533
534 #ifdef CONFIG_MAGIC_SYSRQ
535 /*
536  * writing 'C' to /proc/sysrq-trigger is like sysrq-C
537  */
538 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
539                                    size_t count, loff_t *ppos)
540 {
541         if (count) {
542                 char c;
543
544                 if (get_user(c, buf))
545                         return -EFAULT;
546                 __handle_sysrq(c, NULL, NULL, 0);
547         }
548         return count;
549 }
550
551 static struct file_operations proc_sysrq_trigger_operations = {
552         .write          = write_sysrq_trigger,
553 };
554 #endif
555
556 struct proc_dir_entry *proc_root_kcore;
557
558 void create_seq_entry(char *name, mode_t mode, struct file_operations *f)
559 {
560         struct proc_dir_entry *entry;
561         entry = create_proc_entry(name, mode, NULL);
562         if (entry)
563                 entry->proc_fops = f;
564 }
565
566 void __init proc_misc_init(void)
567 {
568         struct proc_dir_entry *entry;
569         static struct {
570                 char *name;
571                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
572         } *p, simple_ones[] = {
573                 {"loadavg",     loadavg_read_proc},
574                 {"uptime",      uptime_read_proc},
575                 {"meminfo",     meminfo_read_proc},
576                 {"version",     version_read_proc},
577 #ifdef CONFIG_PROC_HARDWARE
578                 {"hardware",    hardware_read_proc},
579 #endif
580 #ifdef CONFIG_STRAM_PROC
581                 {"stram",       stram_read_proc},
582 #endif
583                 {"devices",     devices_read_proc},
584                 {"filesystems", filesystems_read_proc},
585                 {"cmdline",     cmdline_read_proc},
586                 {"locks",       locks_read_proc},
587                 {"execdomains", execdomains_read_proc},
588                 {NULL,}
589         };
590         for (p = simple_ones; p->name; p++)
591                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
592
593         proc_symlink("mounts", NULL, "self/mounts");
594
595         /* And now for trickier ones */
596         entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
597         if (entry)
598                 entry->proc_fops = &proc_kmsg_operations;
599         create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
600         create_seq_entry("partitions", 0, &proc_partitions_operations);
601         create_seq_entry("stat", 0, &proc_stat_operations);
602         create_seq_entry("interrupts", 0, &proc_interrupts_operations);
603         create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
604         create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
605         create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
606         create_seq_entry("zoneinfo",S_IRUGO, &proc_zoneinfo_file_operations);
607         create_seq_entry("diskstats", 0, &proc_diskstats_operations);
608 #ifdef CONFIG_MODULES
609         create_seq_entry("modules", 0, &proc_modules_operations);
610 #endif
611 #ifdef CONFIG_SCHEDSTATS
612         create_seq_entry("schedstat", 0, &proc_schedstat_operations);
613 #endif
614 #ifdef CONFIG_PROC_KCORE
615         proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
616         if (proc_root_kcore) {
617                 proc_root_kcore->proc_fops = &proc_kcore_operations;
618                 proc_root_kcore->size =
619                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
620         }
621 #endif
622 #ifdef CONFIG_PROC_VMCORE
623         proc_vmcore = create_proc_entry("vmcore", S_IRUSR, NULL);
624         if (proc_vmcore)
625                 proc_vmcore->proc_fops = &proc_vmcore_operations;
626 #endif
627 #ifdef CONFIG_MAGIC_SYSRQ
628         entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
629         if (entry)
630                 entry->proc_fops = &proc_sysrq_trigger_operations;
631 #endif
632 #ifdef CONFIG_PPC32
633         {
634                 extern struct file_operations ppc_htab_operations;
635                 entry = create_proc_entry("ppc_htab", S_IRUGO|S_IWUSR, NULL);
636                 if (entry)
637                         entry->proc_fops = &ppc_htab_operations;
638         }
639 #endif
640 }