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 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);
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 }
616
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