2 * linux/fs/proc/proc_misc.c
4 * linux/fs/proc/array.c
5 * Copyright (C) 1992 by Linus Torvalds
6 * based on ideas by Darren Senn
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.
14 * Fulton Green : Encapsulated position metric calculations.
15 * <kernel@FultonGreen.com>
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>
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>
50 #include <asm/pgalloc.h>
52 #include <asm/div64.h>
54 #define LOAD_INT(x) ((x) >> FSHIFT)
55 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
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.
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_blkdev_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 #ifdef CONFIG_SGI_DS1286
71 extern int get_ds1286_status(char *);
74 static int proc_calc_metrics(char *page, char **start, off_t off,
75 int count, int *eof, int len)
77 if (len <= off+count) *eof = 1;
80 if (len>count) len = count;
85 static int loadavg_read_proc(char *page, char **start, off_t off,
86 int count, int *eof, void *data)
91 a = avenrun[0] + (FIXED_1/200);
92 b = avenrun[1] + (FIXED_1/200);
93 c = avenrun[2] + (FIXED_1/200);
94 len = sprintf(page,"%d.%02d %d.%02d %d.%02d %ld/%d %d\n",
95 LOAD_INT(a), LOAD_FRAC(a),
96 LOAD_INT(b), LOAD_FRAC(b),
97 LOAD_INT(c), LOAD_FRAC(c),
98 nr_running(), nr_threads, last_pid);
99 return proc_calc_metrics(page, start, off, count, eof, len);
102 struct vmalloc_info {
104 unsigned long largest_chunk;
107 static struct vmalloc_info get_vmalloc_info(void)
109 unsigned long prev_end = VMALLOC_START;
110 struct vm_struct* vma;
111 struct vmalloc_info vmi;
114 read_lock(&vmlist_lock);
117 vmi.largest_chunk = (VMALLOC_END-VMALLOC_START);
119 vmi.largest_chunk = 0;
121 for (vma = vmlist; vma; vma = vma->next) {
122 unsigned long free_area_size =
123 (unsigned long)vma->addr - prev_end;
124 vmi.used += vma->size;
125 if (vmi.largest_chunk < free_area_size )
127 vmi.largest_chunk = free_area_size;
128 prev_end = vma->size + (unsigned long)vma->addr;
130 if(VMALLOC_END-prev_end > vmi.largest_chunk)
131 vmi.largest_chunk = VMALLOC_END-prev_end;
133 read_unlock(&vmlist_lock);
137 static int uptime_read_proc(char *page, char **start, off_t off,
138 int count, int *eof, void *data)
140 struct timespec uptime;
141 struct timespec idle;
143 u64 idle_jiffies = init_task.utime + init_task.stime;
145 do_posix_clock_monotonic_gettime(&uptime);
146 jiffies_to_timespec(idle_jiffies, &idle);
147 len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
148 (unsigned long) uptime.tv_sec,
149 (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
150 (unsigned long) idle.tv_sec,
151 (idle.tv_nsec / (NSEC_PER_SEC / 100)));
153 return proc_calc_metrics(page, start, off, count, eof, len);
156 static int meminfo_read_proc(char *page, char **start, off_t off,
157 int count, int *eof, void *data)
161 struct page_state ps;
162 unsigned long inactive;
163 unsigned long active;
166 struct vmalloc_info vmi;
169 get_zone_counts(&active, &inactive, &free);
172 * display in kilobytes.
174 #define K(x) ((x) << (PAGE_SHIFT - 10))
177 committed = atomic_read(&vm_committed_space);
179 vmtot = (VMALLOC_END-VMALLOC_START)>>10;
180 vmi = get_vmalloc_info();
182 vmi.largest_chunk >>= 10;
185 * Tagged format, for easy grepping and expansion.
188 "MemTotal: %8lu kB\n"
192 "SwapCached: %8lu kB\n"
194 "Inactive: %8lu kB\n"
195 "HighTotal: %8lu kB\n"
196 "HighFree: %8lu kB\n"
197 "LowTotal: %8lu kB\n"
199 "SwapTotal: %8lu kB\n"
200 "SwapFree: %8lu kB\n"
202 "Writeback: %8lu kB\n"
205 "Committed_AS: %8u kB\n"
206 "PageTables: %8lu kB\n"
207 "VmallocTotal: %8lu kB\n"
208 "VmallocUsed: %8lu kB\n"
209 "VmallocChunk: %8lu kB\n",
213 K(get_page_cache_size()-total_swapcache_pages-i.bufferram),
214 K(total_swapcache_pages),
219 K(i.totalram-i.totalhigh),
220 K(i.freeram-i.freehigh),
228 K(ps.nr_page_table_pages),
234 len += hugetlb_report_meminfo(page + len);
236 return proc_calc_metrics(page, start, off, count, eof, len);
240 extern struct seq_operations fragmentation_op;
241 static int fragmentation_open(struct inode *inode, struct file *file)
244 return seq_open(file, &fragmentation_op);
247 static struct file_operations fragmentation_file_operations = {
248 .open = fragmentation_open,
251 .release = seq_release,
254 static int version_read_proc(char *page, char **start, off_t off,
255 int count, int *eof, void *data)
257 extern char *linux_banner;
260 strcpy(page, linux_banner);
262 return proc_calc_metrics(page, start, off, count, eof, len);
265 extern struct seq_operations cpuinfo_op;
266 static int cpuinfo_open(struct inode *inode, struct file *file)
268 return seq_open(file, &cpuinfo_op);
270 static struct file_operations proc_cpuinfo_operations = {
271 .open = cpuinfo_open,
274 .release = seq_release,
277 extern struct seq_operations vmstat_op;
278 static int vmstat_open(struct inode *inode, struct file *file)
280 return seq_open(file, &vmstat_op);
282 static struct file_operations proc_vmstat_file_operations = {
286 .release = seq_release,
289 #ifdef CONFIG_PROC_HARDWARE
290 static int hardware_read_proc(char *page, char **start, off_t off,
291 int count, int *eof, void *data)
293 int len = get_hardware_list(page);
294 return proc_calc_metrics(page, start, off, count, eof, len);
298 #ifdef CONFIG_STRAM_PROC
299 static int stram_read_proc(char *page, char **start, off_t off,
300 int count, int *eof, void *data)
302 int len = get_stram_list(page);
303 return proc_calc_metrics(page, start, off, count, eof, len);
307 extern struct seq_operations partitions_op;
308 static int partitions_open(struct inode *inode, struct file *file)
310 return seq_open(file, &partitions_op);
312 static struct file_operations proc_partitions_operations = {
313 .open = partitions_open,
316 .release = seq_release,
319 extern struct seq_operations diskstats_op;
320 static int diskstats_open(struct inode *inode, struct file *file)
322 return seq_open(file, &diskstats_op);
324 static struct file_operations proc_diskstats_operations = {
325 .open = diskstats_open,
328 .release = seq_release,
331 #ifdef CONFIG_MODULES
332 extern struct seq_operations modules_op;
333 static int modules_open(struct inode *inode, struct file *file)
335 return seq_open(file, &modules_op);
337 static struct file_operations proc_modules_operations = {
338 .open = modules_open,
341 .release = seq_release,
345 extern struct seq_operations slabinfo_op;
346 extern ssize_t slabinfo_write(struct file *, const char __user *, size_t, loff_t *);
347 static int slabinfo_open(struct inode *inode, struct file *file)
349 return seq_open(file, &slabinfo_op);
351 static struct file_operations proc_slabinfo_operations = {
352 .open = slabinfo_open,
354 .write = slabinfo_write,
356 .release = seq_release,
359 int show_stat(struct seq_file *p, void *v)
362 extern unsigned long total_forks;
364 u64 sum = 0, user = 0, nice = 0, system = 0,
365 idle = 0, iowait = 0, irq = 0, softirq = 0;
367 jif = - wall_to_monotonic.tv_sec;
368 if (wall_to_monotonic.tv_nsec)
374 user += kstat_cpu(i).cpustat.user;
375 nice += kstat_cpu(i).cpustat.nice;
376 system += kstat_cpu(i).cpustat.system;
377 idle += kstat_cpu(i).cpustat.idle;
378 iowait += kstat_cpu(i).cpustat.iowait;
379 irq += kstat_cpu(i).cpustat.irq;
380 softirq += kstat_cpu(i).cpustat.softirq;
381 for (j = 0 ; j < NR_IRQS ; j++)
382 sum += kstat_cpu(i).irqs[j];
385 seq_printf(p, "cpu %llu %llu %llu %llu %llu %llu %llu\n",
386 (unsigned long long)jiffies_64_to_clock_t(user),
387 (unsigned long long)jiffies_64_to_clock_t(nice),
388 (unsigned long long)jiffies_64_to_clock_t(system),
389 (unsigned long long)jiffies_64_to_clock_t(idle),
390 (unsigned long long)jiffies_64_to_clock_t(iowait),
391 (unsigned long long)jiffies_64_to_clock_t(irq),
392 (unsigned long long)jiffies_64_to_clock_t(softirq));
395 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
396 user = kstat_cpu(i).cpustat.user;
397 nice = kstat_cpu(i).cpustat.nice;
398 system = kstat_cpu(i).cpustat.system;
399 idle = kstat_cpu(i).cpustat.idle;
400 iowait = kstat_cpu(i).cpustat.iowait;
401 irq = kstat_cpu(i).cpustat.irq;
402 softirq = kstat_cpu(i).cpustat.softirq;
403 seq_printf(p, "cpu%d %llu %llu %llu %llu %llu %llu %llu\n",
405 (unsigned long long)jiffies_64_to_clock_t(user),
406 (unsigned long long)jiffies_64_to_clock_t(nice),
407 (unsigned long long)jiffies_64_to_clock_t(system),
408 (unsigned long long)jiffies_64_to_clock_t(idle),
409 (unsigned long long)jiffies_64_to_clock_t(iowait),
410 (unsigned long long)jiffies_64_to_clock_t(irq),
411 (unsigned long long)jiffies_64_to_clock_t(softirq));
413 seq_printf(p, "intr %llu", (unsigned long long)sum);
415 #if !defined(CONFIG_PPC64) && !defined(CONFIG_ALPHA)
416 for (i = 0; i < NR_IRQS; i++)
417 seq_printf(p, " %u", kstat_irqs(i));
424 "procs_running %lu\n"
425 "procs_blocked %lu\n",
426 nr_context_switches(),
435 static int stat_open(struct inode *inode, struct file *file)
437 unsigned size = 4096 * (1 + num_possible_cpus() / 32);
442 /* don't ask for more than the kmalloc() max size, currently 128 KB */
443 if (size > 128 * 1024)
445 buf = kmalloc(size, GFP_KERNEL);
449 res = single_open(file, show_stat, NULL);
451 m = file->private_data;
458 static struct file_operations proc_stat_operations = {
462 .release = single_release,
465 static int devices_read_proc(char *page, char **start, off_t off,
466 int count, int *eof, void *data)
468 int len = get_chrdev_list(page);
469 len += get_blkdev_list(page+len);
470 return proc_calc_metrics(page, start, off, count, eof, len);
476 static void *int_seq_start(struct seq_file *f, loff_t *pos)
478 return (*pos <= NR_IRQS) ? pos : NULL;
481 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
489 static void int_seq_stop(struct seq_file *f, void *v)
495 extern int show_interrupts(struct seq_file *f, void *v); /* In arch code */
496 static struct seq_operations int_seq_ops = {
497 .start = int_seq_start,
498 .next = int_seq_next,
499 .stop = int_seq_stop,
500 .show = show_interrupts
503 int interrupts_open(struct inode *inode, struct file *filp)
505 return seq_open(filp, &int_seq_ops);
508 static struct file_operations proc_interrupts_operations = {
509 .open = interrupts_open,
512 .release = seq_release,
515 static int filesystems_read_proc(char *page, char **start, off_t off,
516 int count, int *eof, void *data)
518 int len = get_filesystem_list(page);
519 return proc_calc_metrics(page, start, off, count, eof, len);
522 static int cmdline_read_proc(char *page, char **start, off_t off,
523 int count, int *eof, void *data)
525 extern char saved_command_line[];
528 len = sprintf(page, "%s\n", saved_command_line);
529 return proc_calc_metrics(page, start, off, count, eof, len);
532 #ifdef CONFIG_SGI_DS1286
533 static int ds1286_read_proc(char *page, char **start, off_t off,
534 int count, int *eof, void *data)
536 int len = get_ds1286_status(page);
537 return proc_calc_metrics(page, start, off, count, eof, len);
541 static int locks_read_proc(char *page, char **start, off_t off,
542 int count, int *eof, void *data)
544 int len = get_locks_status(page, start, off, count);
551 static int execdomains_read_proc(char *page, char **start, off_t off,
552 int count, int *eof, void *data)
554 int len = get_exec_domain_list(page);
555 return proc_calc_metrics(page, start, off, count, eof, len);
559 * This function accesses profiling information. The returned data is
560 * binary: the sampling step and the actual contents of the profile
561 * buffer. Use of the program readprofile is recommended in order to
562 * get meaningful info out of these data.
565 read_profile(struct file *file, char __user *buf, size_t count, loff_t *ppos)
567 unsigned long p = *ppos;
570 unsigned int sample_step = 1 << prof_shift;
572 if (p >= (prof_len+1)*sizeof(unsigned int))
574 if (count > (prof_len+1)*sizeof(unsigned int) - p)
575 count = (prof_len+1)*sizeof(unsigned int) - p;
578 while (p < sizeof(unsigned int) && count > 0) {
579 put_user(*((char *)(&sample_step)+p),buf);
580 buf++; p++; count--; read++;
582 pnt = (char *)prof_buffer + p - sizeof(unsigned int);
583 if (copy_to_user(buf,(void *)pnt,count))
591 * Writing to /proc/profile resets the counters
593 * Writing a 'profiling multiplier' value into it also re-sets the profiling
594 * interrupt frequency, on architectures that support this.
596 static ssize_t write_profile(struct file *file, const char __user *buf,
597 size_t count, loff_t *ppos)
600 extern int setup_profiling_timer (unsigned int multiplier);
602 if (count == sizeof(int)) {
603 unsigned int multiplier;
605 if (copy_from_user(&multiplier, buf, sizeof(int)))
608 if (setup_profiling_timer(multiplier))
613 memset(prof_buffer, 0, prof_len * sizeof(*prof_buffer));
617 static struct file_operations proc_profile_operations = {
618 .read = read_profile,
619 .write = write_profile,
622 #ifdef CONFIG_MAGIC_SYSRQ
624 * writing 'C' to /proc/sysrq-trigger is like sysrq-C
626 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
627 size_t count, loff_t *ppos)
632 if (get_user(c, buf))
634 handle_sysrq(c, NULL, NULL);
639 static struct file_operations proc_sysrq_trigger_operations = {
640 .write = write_sysrq_trigger,
644 struct proc_dir_entry *proc_root_kcore;
646 static void create_seq_entry(char *name, mode_t mode, struct file_operations *f)
648 struct proc_dir_entry *entry;
649 entry = create_proc_entry(name, mode, NULL);
651 entry->proc_fops = f;
654 void __init proc_misc_init(void)
656 struct proc_dir_entry *entry;
659 int (*read_proc)(char*,char**,off_t,int,int*,void*);
660 } *p, simple_ones[] = {
661 {"loadavg", loadavg_read_proc},
662 {"uptime", uptime_read_proc},
663 {"meminfo", meminfo_read_proc},
664 {"version", version_read_proc},
665 #ifdef CONFIG_PROC_HARDWARE
666 {"hardware", hardware_read_proc},
668 #ifdef CONFIG_STRAM_PROC
669 {"stram", stram_read_proc},
671 {"devices", devices_read_proc},
672 {"filesystems", filesystems_read_proc},
673 {"cmdline", cmdline_read_proc},
674 #ifdef CONFIG_SGI_DS1286
675 {"rtc", ds1286_read_proc},
677 {"locks", locks_read_proc},
678 {"execdomains", execdomains_read_proc},
681 for (p = simple_ones; p->name; p++)
682 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
684 proc_symlink("mounts", NULL, "self/mounts");
686 /* And now for trickier ones */
687 entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
689 entry->proc_fops = &proc_kmsg_operations;
690 create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
691 create_seq_entry("partitions", 0, &proc_partitions_operations);
692 create_seq_entry("stat", 0, &proc_stat_operations);
693 create_seq_entry("interrupts", 0, &proc_interrupts_operations);
694 create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
695 create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
696 create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
697 create_seq_entry("diskstats", 0, &proc_diskstats_operations);
698 #ifdef CONFIG_MODULES
699 create_seq_entry("modules", 0, &proc_modules_operations);
701 #ifdef CONFIG_PROC_KCORE
702 proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
703 if (proc_root_kcore) {
704 proc_root_kcore->proc_fops = &proc_kcore_operations;
705 proc_root_kcore->size =
706 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
710 entry = create_proc_entry("profile", S_IWUSR | S_IRUGO, NULL);
712 entry->proc_fops = &proc_profile_operations;
713 entry->size = (1+prof_len) * sizeof(unsigned int);
716 #ifdef CONFIG_MAGIC_SYSRQ
717 entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
719 entry->proc_fops = &proc_sysrq_trigger_operations;
723 extern struct file_operations ppc_htab_operations;
724 entry = create_proc_entry("ppc_htab", S_IRUGO|S_IWUSR, NULL);
726 entry->proc_fops = &ppc_htab_operations;